#include <machine/endian.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/filio.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/kernel.h>
#include <sys/time.h>
#include <sys/proc.h>
#include <sys/random.h>
#include <sys/mcache.h>
#include <libkern/crypto/md5.h>
#include <libkern/libkern.h>
#include <mach/thread_act.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/bpf.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/tcp_seq.h>
#include <netinet/udp.h>
#include <netinet/ip_icmp.h>
#include <netinet/in_pcb.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/tcp_fsm.h>
#include <netinet/udp_var.h>
#include <netinet/icmp_var.h>
#include <net/if_ether.h>
#include <net/ethernet.h>
#include <net/flowhash.h>
#include <net/pfvar.h>
#include <net/if_pflog.h>
#if NPFSYNC
#include <net/if_pfsync.h>
#endif
#if INET6
#include <netinet/ip6.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/ip6_var.h>
#include <netinet/icmp6.h>
#include <netinet6/nd6.h>
#endif
#if DUMMYNET
#include <netinet/ip_dummynet.h>
#endif
#define DPFPRINTF(n, x) (pf_status.debug >= (n) ? printf x : ((void)0))
#define PF_RTABLEID_IS_VALID(r) \
((r) > IFSCOPE_NONE && (r) <= INT_MAX)
decl_lck_mtx_data(,pf_lock_data);
decl_lck_rw_data(,pf_perim_lock_data);
lck_mtx_t *pf_lock = &pf_lock_data;
lck_rw_t *pf_perim_lock = &pf_perim_lock_data;
struct pf_state_tree_lan_ext pf_statetbl_lan_ext;
struct pf_state_tree_ext_gwy pf_statetbl_ext_gwy;
struct pf_palist pf_pabuf;
struct pf_status pf_status;
#if PF_ALTQ
struct pf_altqqueue pf_altqs[2];
struct pf_altqqueue *pf_altqs_active;
struct pf_altqqueue *pf_altqs_inactive;
u_int32_t ticket_altqs_active;
u_int32_t ticket_altqs_inactive;
int altqs_inactive_open;
#endif
u_int32_t ticket_pabuf;
static MD5_CTX pf_tcp_secret_ctx;
static u_char pf_tcp_secret[16];
static int pf_tcp_secret_init;
static int pf_tcp_iss_off;
static struct pf_anchor_stackframe {
struct pf_ruleset *rs;
struct pf_rule *r;
struct pf_anchor_node *parent;
struct pf_anchor *child;
} pf_anchor_stack[64];
struct pool pf_src_tree_pl, pf_rule_pl, pf_pooladdr_pl;
struct pool pf_state_pl, pf_state_key_pl;
#if PF_ALTQ
struct pool pf_altq_pl;
#endif
typedef void (*hook_fn_t)(void *);
struct hook_desc {
TAILQ_ENTRY(hook_desc) hd_list;
hook_fn_t hd_fn;
void *hd_arg;
};
#define HOOK_REMOVE 0x01
#define HOOK_FREE 0x02
#define HOOK_ABORT 0x04
static void *hook_establish(struct hook_desc_head *, int,
hook_fn_t, void *);
static void hook_runloop(struct hook_desc_head *, int flags);
struct pool pf_app_state_pl;
static void pf_print_addr(struct pf_addr *addr, sa_family_t af);
static void pf_print_sk_host(struct pf_state_host *, u_int8_t, int,
u_int8_t);
static void pf_print_host(struct pf_addr *, u_int16_t, u_int8_t);
static void pf_init_threshold(struct pf_threshold *, u_int32_t,
u_int32_t);
static void pf_add_threshold(struct pf_threshold *);
static int pf_check_threshold(struct pf_threshold *);
static void pf_change_ap(int, struct mbuf *, struct pf_addr *,
u_int16_t *, u_int16_t *, u_int16_t *,
struct pf_addr *, u_int16_t, u_int8_t, sa_family_t);
static int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *,
struct tcphdr *, struct pf_state_peer *);
#if INET6
static void pf_change_a6(struct pf_addr *, u_int16_t *,
struct pf_addr *, u_int8_t);
#endif
static void pf_change_icmp(struct pf_addr *, u_int16_t *,
struct pf_addr *, struct pf_addr *, u_int16_t,
u_int16_t *, u_int16_t *, u_int16_t *,
u_int16_t *, u_int8_t, sa_family_t);
static void pf_send_tcp(const struct pf_rule *, sa_family_t,
const struct pf_addr *, const struct pf_addr *,
u_int16_t, u_int16_t, u_int32_t, u_int32_t,
u_int8_t, u_int16_t, u_int16_t, u_int8_t, int,
u_int16_t, struct ether_header *, struct ifnet *);
static void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
sa_family_t, struct pf_rule *);
static struct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *,
int, int, struct pfi_kif *, struct pf_addr *,
union pf_state_xport *, struct pf_addr *,
union pf_state_xport *, int);
static struct pf_rule *pf_get_translation_aux(struct pf_pdesc *,
struct mbuf *, int, int, struct pfi_kif *,
struct pf_src_node **, struct pf_addr *,
union pf_state_xport *, struct pf_addr *,
union pf_state_xport *, struct pf_addr *,
union pf_state_xport *);
static void pf_attach_state(struct pf_state_key *,
struct pf_state *, int);
static void pf_detach_state(struct pf_state *, int);
static u_int32_t pf_tcp_iss(struct pf_pdesc *);
static int pf_test_rule(struct pf_rule **, struct pf_state **,
int, struct pfi_kif *, struct mbuf *, int,
void *, struct pf_pdesc *, struct pf_rule **,
struct pf_ruleset **, struct ifqueue *);
#if DUMMYNET
static int pf_test_dummynet(struct pf_rule **, int,
struct pfi_kif *, struct mbuf **,
struct pf_pdesc *, struct ip_fw_args *);
#endif
static int pf_test_fragment(struct pf_rule **, int,
struct pfi_kif *, struct mbuf *, void *,
struct pf_pdesc *, struct pf_rule **,
struct pf_ruleset **);
static int pf_test_state_tcp(struct pf_state **, int,
struct pfi_kif *, struct mbuf *, int,
void *, struct pf_pdesc *, u_short *);
static int pf_test_state_udp(struct pf_state **, int,
struct pfi_kif *, struct mbuf *, int,
void *, struct pf_pdesc *, u_short *);
static int pf_test_state_icmp(struct pf_state **, int,
struct pfi_kif *, struct mbuf *, int,
void *, struct pf_pdesc *, u_short *);
static int pf_test_state_other(struct pf_state **, int,
struct pfi_kif *, struct pf_pdesc *);
static int pf_match_tag(struct mbuf *, struct pf_rule *,
struct pf_mtag *, int *);
static void pf_hash(struct pf_addr *, struct pf_addr *,
struct pf_poolhashkey *, sa_family_t);
static int pf_map_addr(u_int8_t, struct pf_rule *,
struct pf_addr *, struct pf_addr *,
struct pf_addr *, struct pf_src_node **);
static int pf_get_sport(struct pf_pdesc *, struct pfi_kif *,
struct pf_rule *, struct pf_addr *,
union pf_state_xport *, struct pf_addr *,
union pf_state_xport *, struct pf_addr *,
union pf_state_xport *, struct pf_src_node **);
static void pf_route(struct mbuf **, struct pf_rule *, int,
struct ifnet *, struct pf_state *,
struct pf_pdesc *);
#if INET6
static void pf_route6(struct mbuf **, struct pf_rule *, int,
struct ifnet *, struct pf_state *,
struct pf_pdesc *);
#endif
static u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t,
sa_family_t);
static u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t,
sa_family_t);
static u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t,
u_int16_t);
static void pf_set_rt_ifp(struct pf_state *,
struct pf_addr *);
static int pf_check_proto_cksum(struct mbuf *, int, int,
u_int8_t, sa_family_t);
static int pf_addr_wrap_neq(struct pf_addr_wrap *,
struct pf_addr_wrap *);
static struct pf_state *pf_find_state(struct pfi_kif *,
struct pf_state_key_cmp *, u_int);
static int pf_src_connlimit(struct pf_state **);
static void pf_stateins_err(const char *, struct pf_state *,
struct pfi_kif *);
static int pf_check_congestion(struct ifqueue *);
#if 0
static const char *pf_pptp_ctrl_type_name(u_int16_t code);
#endif
static void pf_pptp_handler(struct pf_state *, int, int,
struct pf_pdesc *, struct pfi_kif *);
static void pf_pptp_unlink(struct pf_state *);
static void pf_grev1_unlink(struct pf_state *);
static int pf_test_state_grev1(struct pf_state **, int,
struct pfi_kif *, int, struct pf_pdesc *);
static int pf_ike_compare(struct pf_app_state *,
struct pf_app_state *);
static int pf_test_state_esp(struct pf_state **, int,
struct pfi_kif *, int, struct pf_pdesc *);
extern struct pool pfr_ktable_pl;
extern struct pool pfr_kentry_pl;
extern int path_mtu_discovery;
struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = {
{ &pf_state_pl, PFSTATE_HIWAT },
{ &pf_app_state_pl, PFAPPSTATE_HIWAT },
{ &pf_src_tree_pl, PFSNODE_HIWAT },
{ &pf_frent_pl, PFFRAG_FRENT_HIWAT },
{ &pfr_ktable_pl, PFR_KTABLE_HIWAT },
{ &pfr_kentry_pl, PFR_KENTRY_HIWAT },
};
struct mbuf *
pf_lazy_makewritable(struct pf_pdesc *pd, struct mbuf *m, int len)
{
if (pd->lmw < 0)
return (0);
VERIFY(m == pd->mp);
if (len > pd->lmw) {
if (m_makewritable(&m, 0, len, M_DONTWAIT))
len = -1;
pd->lmw = len;
if (len >= 0 && m != pd->mp) {
pd->mp = m;
pd->pf_mtag = pf_find_mtag(m);
switch (pd->af) {
case AF_INET: {
struct ip *h = mtod(m, struct ip *);
pd->src = (struct pf_addr *)&h->ip_src;
pd->dst = (struct pf_addr *)&h->ip_dst;
pd->ip_sum = &h->ip_sum;
break;
}
#if INET6
case AF_INET6: {
struct ip6_hdr *h = mtod(m, struct ip6_hdr *);
pd->src = (struct pf_addr *)&h->ip6_src;
pd->dst = (struct pf_addr *)&h->ip6_dst;
break;
}
#endif
}
}
}
return (len < 0 ? 0 : m);
}
static const int *
pf_state_lookup_aux(struct pf_state **state, struct pfi_kif *kif,
int direction, int *action)
{
if (*state == NULL || (*state)->timeout == PFTM_PURGE) {
*action = PF_DROP;
return (action);
}
if (direction == PF_OUT &&
(((*state)->rule.ptr->rt == PF_ROUTETO &&
(*state)->rule.ptr->direction == PF_OUT) ||
((*state)->rule.ptr->rt == PF_REPLYTO &&
(*state)->rule.ptr->direction == PF_IN)) &&
(*state)->rt_kif != NULL && (*state)->rt_kif != kif) {
*action = PF_PASS;
return (action);
}
return (0);
}
#define STATE_LOOKUP() \
do { \
int action; \
*state = pf_find_state(kif, &key, direction); \
if (*state != NULL && pd != NULL && \
pd->flowhash == 0) { \
pd->flowhash = (*state)->state_key->flowhash; \
} \
if (pf_state_lookup_aux(state, kif, direction, &action)) \
return (action); \
} while (0)
#define STATE_ADDR_TRANSLATE(sk) \
(sk)->lan.addr.addr32[0] != (sk)->gwy.addr.addr32[0] || \
((sk)->af == AF_INET6 && \
((sk)->lan.addr.addr32[1] != (sk)->gwy.addr.addr32[1] || \
(sk)->lan.addr.addr32[2] != (sk)->gwy.addr.addr32[2] || \
(sk)->lan.addr.addr32[3] != (sk)->gwy.addr.addr32[3]))
#define STATE_TRANSLATE(sk) \
(STATE_ADDR_TRANSLATE(sk) || \
(sk)->lan.xport.port != (sk)->gwy.xport.port)
#define STATE_GRE_TRANSLATE(sk) \
(STATE_ADDR_TRANSLATE(sk) || \
(sk)->lan.xport.call_id != (sk)->gwy.xport.call_id)
#define BOUND_IFACE(r, k) \
((r)->rule_flag & PFRULE_IFBOUND) ? (k) : pfi_all
#define STATE_INC_COUNTERS(s) \
do { \
s->rule.ptr->states++; \
VERIFY(s->rule.ptr->states != 0); \
if (s->anchor.ptr != NULL) { \
s->anchor.ptr->states++; \
VERIFY(s->anchor.ptr->states != 0); \
} \
if (s->nat_rule.ptr != NULL) { \
s->nat_rule.ptr->states++; \
VERIFY(s->nat_rule.ptr->states != 0); \
} \
} while (0)
#define STATE_DEC_COUNTERS(s) \
do { \
if (s->nat_rule.ptr != NULL) { \
VERIFY(s->nat_rule.ptr->states > 0); \
s->nat_rule.ptr->states--; \
} \
if (s->anchor.ptr != NULL) { \
VERIFY(s->anchor.ptr->states > 0); \
s->anchor.ptr->states--; \
} \
VERIFY(s->rule.ptr->states > 0); \
s->rule.ptr->states--; \
} while (0)
static __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *);
static __inline int pf_state_compare_lan_ext(struct pf_state_key *,
struct pf_state_key *);
static __inline int pf_state_compare_ext_gwy(struct pf_state_key *,
struct pf_state_key *);
static __inline int pf_state_compare_id(struct pf_state *,
struct pf_state *);
struct pf_src_tree tree_src_tracking;
struct pf_state_tree_id tree_id;
struct pf_state_queue state_list;
RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare);
RB_GENERATE(pf_state_tree_lan_ext, pf_state_key,
entry_lan_ext, pf_state_compare_lan_ext);
RB_GENERATE(pf_state_tree_ext_gwy, pf_state_key,
entry_ext_gwy, pf_state_compare_ext_gwy);
RB_GENERATE(pf_state_tree_id, pf_state,
entry_id, pf_state_compare_id);
#define PF_DT_SKIP_LANEXT 0x01
#define PF_DT_SKIP_EXTGWY 0x02
static const u_int16_t PF_PPTP_PORT = 1723;
static const u_int32_t PF_PPTP_MAGIC_NUMBER = 0x1A2B3C4D;
struct pf_pptp_hdr {
u_int16_t length;
u_int16_t type;
u_int32_t magic;
};
struct pf_pptp_ctrl_hdr {
u_int16_t type;
u_int16_t reserved_0;
};
struct pf_pptp_ctrl_generic {
u_int16_t data[0];
};
#define PF_PPTP_CTRL_TYPE_START_REQ 1
struct pf_pptp_ctrl_start_req {
u_int16_t protocol_version;
u_int16_t reserved_1;
u_int32_t framing_capabilities;
u_int32_t bearer_capabilities;
u_int16_t maximum_channels;
u_int16_t firmware_revision;
u_int8_t host_name[64];
u_int8_t vendor_string[64];
};
#define PF_PPTP_CTRL_TYPE_START_RPY 2
struct pf_pptp_ctrl_start_rpy {
u_int16_t protocol_version;
u_int8_t result_code;
u_int8_t error_code;
u_int32_t framing_capabilities;
u_int32_t bearer_capabilities;
u_int16_t maximum_channels;
u_int16_t firmware_revision;
u_int8_t host_name[64];
u_int8_t vendor_string[64];
};
#define PF_PPTP_CTRL_TYPE_STOP_REQ 3
struct pf_pptp_ctrl_stop_req {
u_int8_t reason;
u_int8_t reserved_1;
u_int16_t reserved_2;
};
#define PF_PPTP_CTRL_TYPE_STOP_RPY 4
struct pf_pptp_ctrl_stop_rpy {
u_int8_t reason;
u_int8_t error_code;
u_int16_t reserved_1;
};
#define PF_PPTP_CTRL_TYPE_ECHO_REQ 5
struct pf_pptp_ctrl_echo_req {
u_int32_t identifier;
};
#define PF_PPTP_CTRL_TYPE_ECHO_RPY 6
struct pf_pptp_ctrl_echo_rpy {
u_int32_t identifier;
u_int8_t result_code;
u_int8_t error_code;
u_int16_t reserved_1;
};
#define PF_PPTP_CTRL_TYPE_CALL_OUT_REQ 7
struct pf_pptp_ctrl_call_out_req {
u_int16_t call_id;
u_int16_t call_sernum;
u_int32_t min_bps;
u_int32_t bearer_type;
u_int32_t framing_type;
u_int16_t rxwindow_size;
u_int16_t proc_delay;
u_int8_t phone_num[64];
u_int8_t sub_addr[64];
};
#define PF_PPTP_CTRL_TYPE_CALL_OUT_RPY 8
struct pf_pptp_ctrl_call_out_rpy {
u_int16_t call_id;
u_int16_t peer_call_id;
u_int8_t result_code;
u_int8_t error_code;
u_int16_t cause_code;
u_int32_t connect_speed;
u_int16_t rxwindow_size;
u_int16_t proc_delay;
u_int32_t phy_channel_id;
};
#define PF_PPTP_CTRL_TYPE_CALL_IN_1ST 9
struct pf_pptp_ctrl_call_in_1st {
u_int16_t call_id;
u_int16_t call_sernum;
u_int32_t bearer_type;
u_int32_t phy_channel_id;
u_int16_t dialed_number_len;
u_int16_t dialing_number_len;
u_int8_t dialed_num[64];
u_int8_t dialing_num[64];
u_int8_t sub_addr[64];
};
#define PF_PPTP_CTRL_TYPE_CALL_IN_2ND 10
struct pf_pptp_ctrl_call_in_2nd {
u_int16_t call_id;
u_int16_t peer_call_id;
u_int8_t result_code;
u_int8_t error_code;
u_int16_t rxwindow_size;
u_int16_t txdelay;
u_int16_t reserved_1;
};
#define PF_PPTP_CTRL_TYPE_CALL_IN_3RD 11
struct pf_pptp_ctrl_call_in_3rd {
u_int16_t call_id;
u_int16_t reserved_1;
u_int32_t connect_speed;
u_int16_t rxwindow_size;
u_int16_t txdelay;
u_int32_t framing_type;
};
#define PF_PPTP_CTRL_TYPE_CALL_CLR 12
struct pf_pptp_ctrl_call_clr {
u_int16_t call_id;
u_int16_t reserved_1;
};
#define PF_PPTP_CTRL_TYPE_CALL_DISC 13
struct pf_pptp_ctrl_call_disc {
u_int16_t call_id;
u_int8_t result_code;
u_int8_t error_code;
u_int16_t cause_code;
u_int16_t reserved_1;
u_int8_t statistics[128];
};
#define PF_PPTP_CTRL_TYPE_ERROR 14
struct pf_pptp_ctrl_error {
u_int16_t peer_call_id;
u_int16_t reserved_1;
u_int32_t crc_errors;
u_int32_t fr_errors;
u_int32_t hw_errors;
u_int32_t buf_errors;
u_int32_t tim_errors;
u_int32_t align_errors;
};
#define PF_PPTP_CTRL_TYPE_SET_LINKINFO 15
struct pf_pptp_ctrl_set_linkinfo {
u_int16_t peer_call_id;
u_int16_t reserved_1;
u_int32_t tx_accm;
u_int32_t rx_accm;
};
#if 0
static const char *pf_pptp_ctrl_type_name(u_int16_t code)
{
code = ntohs(code);
if (code < PF_PPTP_CTRL_TYPE_START_REQ ||
code > PF_PPTP_CTRL_TYPE_SET_LINKINFO) {
static char reserved[] = "reserved-00";
sprintf(&reserved[9], "%02x", code);
return (reserved);
} else {
static const char *name[] = {
"start_req", "start_rpy", "stop_req", "stop_rpy",
"echo_req", "echo_rpy", "call_out_req", "call_out_rpy",
"call_in_1st", "call_in_2nd", "call_in_3rd",
"call_clr", "call_disc", "error", "set_linkinfo"
};
return (name[code - 1]);
}
};
#endif
static const size_t PF_PPTP_CTRL_MSG_MINSIZE =
sizeof (struct pf_pptp_hdr) +
sizeof (struct pf_pptp_ctrl_hdr) +
MIN(sizeof (struct pf_pptp_ctrl_start_req),
MIN(sizeof (struct pf_pptp_ctrl_start_rpy),
MIN(sizeof (struct pf_pptp_ctrl_stop_req),
MIN(sizeof (struct pf_pptp_ctrl_stop_rpy),
MIN(sizeof (struct pf_pptp_ctrl_echo_req),
MIN(sizeof (struct pf_pptp_ctrl_echo_rpy),
MIN(sizeof (struct pf_pptp_ctrl_call_out_req),
MIN(sizeof (struct pf_pptp_ctrl_call_out_rpy),
MIN(sizeof (struct pf_pptp_ctrl_call_in_1st),
MIN(sizeof (struct pf_pptp_ctrl_call_in_2nd),
MIN(sizeof (struct pf_pptp_ctrl_call_in_3rd),
MIN(sizeof (struct pf_pptp_ctrl_call_clr),
MIN(sizeof (struct pf_pptp_ctrl_call_disc),
MIN(sizeof (struct pf_pptp_ctrl_error),
sizeof (struct pf_pptp_ctrl_set_linkinfo)
))))))))))))));
union pf_pptp_ctrl_msg_union {
struct pf_pptp_ctrl_start_req start_req;
struct pf_pptp_ctrl_start_rpy start_rpy;
struct pf_pptp_ctrl_stop_req stop_req;
struct pf_pptp_ctrl_stop_rpy stop_rpy;
struct pf_pptp_ctrl_echo_req echo_req;
struct pf_pptp_ctrl_echo_rpy echo_rpy;
struct pf_pptp_ctrl_call_out_req call_out_req;
struct pf_pptp_ctrl_call_out_rpy call_out_rpy;
struct pf_pptp_ctrl_call_in_1st call_in_1st;
struct pf_pptp_ctrl_call_in_2nd call_in_2nd;
struct pf_pptp_ctrl_call_in_3rd call_in_3rd;
struct pf_pptp_ctrl_call_clr call_clr;
struct pf_pptp_ctrl_call_disc call_disc;
struct pf_pptp_ctrl_error error;
struct pf_pptp_ctrl_set_linkinfo set_linkinfo;
u_int8_t data[0];
};
struct pf_pptp_ctrl_msg {
struct pf_pptp_hdr hdr;
struct pf_pptp_ctrl_hdr ctrl;
union pf_pptp_ctrl_msg_union msg;
};
#define PF_GRE_FLAG_CHECKSUM_PRESENT 0x8000
#define PF_GRE_FLAG_VERSION_MASK 0x0007
#define PF_GRE_PPP_ETHERTYPE 0x880B
struct pf_grev1_hdr {
u_int16_t flags;
u_int16_t protocol_type;
u_int16_t payload_length;
u_int16_t call_id;
};
static const u_int16_t PF_IKE_PORT = 500;
struct pf_ike_hdr {
u_int64_t initiator_cookie, responder_cookie;
u_int8_t next_payload, version, exchange_type, flags;
u_int32_t message_id, length;
};
#define PF_IKE_PACKET_MINSIZE (sizeof (struct pf_ike_hdr))
#define PF_IKEv1_EXCHTYPE_BASE 1
#define PF_IKEv1_EXCHTYPE_ID_PROTECT 2
#define PF_IKEv1_EXCHTYPE_AUTH_ONLY 3
#define PF_IKEv1_EXCHTYPE_AGGRESSIVE 4
#define PF_IKEv1_EXCHTYPE_INFORMATIONAL 5
#define PF_IKEv2_EXCHTYPE_SA_INIT 34
#define PF_IKEv2_EXCHTYPE_AUTH 35
#define PF_IKEv2_EXCHTYPE_CREATE_CHILD_SA 36
#define PF_IKEv2_EXCHTYPE_INFORMATIONAL 37
#define PF_IKEv1_FLAG_E 0x01
#define PF_IKEv1_FLAG_C 0x02
#define PF_IKEv1_FLAG_A 0x04
#define PF_IKEv2_FLAG_I 0x08
#define PF_IKEv2_FLAG_V 0x10
#define PF_IKEv2_FLAG_R 0x20
struct pf_esp_hdr {
u_int32_t spi;
u_int32_t seqno;
u_int8_t payload[];
};
static __inline int
pf_src_compare(struct pf_src_node *a, struct pf_src_node *b)
{
int diff;
if (a->rule.ptr > b->rule.ptr)
return (1);
if (a->rule.ptr < b->rule.ptr)
return (-1);
if ((diff = a->af - b->af) != 0)
return (diff);
switch (a->af) {
#if INET
case AF_INET:
if (a->addr.addr32[0] > b->addr.addr32[0])
return (1);
if (a->addr.addr32[0] < b->addr.addr32[0])
return (-1);
break;
#endif
#if INET6
case AF_INET6:
if (a->addr.addr32[3] > b->addr.addr32[3])
return (1);
if (a->addr.addr32[3] < b->addr.addr32[3])
return (-1);
if (a->addr.addr32[2] > b->addr.addr32[2])
return (1);
if (a->addr.addr32[2] < b->addr.addr32[2])
return (-1);
if (a->addr.addr32[1] > b->addr.addr32[1])
return (1);
if (a->addr.addr32[1] < b->addr.addr32[1])
return (-1);
if (a->addr.addr32[0] > b->addr.addr32[0])
return (1);
if (a->addr.addr32[0] < b->addr.addr32[0])
return (-1);
break;
#endif
}
return (0);
}
static __inline int
pf_state_compare_lan_ext(struct pf_state_key *a, struct pf_state_key *b)
{
int diff;
int extfilter;
if ((diff = a->proto - b->proto) != 0)
return (diff);
if ((diff = a->af - b->af) != 0)
return (diff);
extfilter = PF_EXTFILTER_APD;
switch (a->proto) {
case IPPROTO_ICMP:
case IPPROTO_ICMPV6:
if ((diff = a->lan.xport.port - b->lan.xport.port) != 0)
return (diff);
break;
case IPPROTO_TCP:
if ((diff = a->lan.xport.port - b->lan.xport.port) != 0)
return (diff);
if ((diff = a->ext.xport.port - b->ext.xport.port) != 0)
return (diff);
break;
case IPPROTO_UDP:
if ((diff = a->proto_variant - b->proto_variant))
return (diff);
extfilter = a->proto_variant;
if ((diff = a->lan.xport.port - b->lan.xport.port) != 0)
return (diff);
if ((extfilter < PF_EXTFILTER_AD) &&
(diff = a->ext.xport.port - b->ext.xport.port) != 0)
return (diff);
break;
case IPPROTO_GRE:
if (a->proto_variant == PF_GRE_PPTP_VARIANT &&
a->proto_variant == b->proto_variant) {
if (!!(diff = a->ext.xport.call_id -
b->ext.xport.call_id))
return (diff);
}
break;
case IPPROTO_ESP:
if (!!(diff = a->ext.xport.spi - b->ext.xport.spi))
return (diff);
break;
default:
break;
}
switch (a->af) {
#if INET
case AF_INET:
if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0])
return (1);
if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0])
return (-1);
if (extfilter < PF_EXTFILTER_EI) {
if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
return (1);
if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
return (-1);
}
break;
#endif
#if INET6
case AF_INET6:
if (a->lan.addr.addr32[3] > b->lan.addr.addr32[3])
return (1);
if (a->lan.addr.addr32[3] < b->lan.addr.addr32[3])
return (-1);
if (a->lan.addr.addr32[2] > b->lan.addr.addr32[2])
return (1);
if (a->lan.addr.addr32[2] < b->lan.addr.addr32[2])
return (-1);
if (a->lan.addr.addr32[1] > b->lan.addr.addr32[1])
return (1);
if (a->lan.addr.addr32[1] < b->lan.addr.addr32[1])
return (-1);
if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0])
return (1);
if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0])
return (-1);
if (extfilter < PF_EXTFILTER_EI ||
!PF_AZERO(&b->ext.addr, AF_INET6)) {
if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
return (1);
if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
return (-1);
if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
return (1);
if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
return (-1);
if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
return (1);
if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
return (-1);
if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
return (1);
if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
return (-1);
}
break;
#endif
}
if (a->app_state && b->app_state) {
if (a->app_state->compare_lan_ext &&
b->app_state->compare_lan_ext) {
diff = (const char *)b->app_state->compare_lan_ext -
(const char *)a->app_state->compare_lan_ext;
if (diff != 0)
return (diff);
diff = a->app_state->compare_lan_ext(a->app_state,
b->app_state);
if (diff != 0)
return (diff);
}
}
return (0);
}
static __inline int
pf_state_compare_ext_gwy(struct pf_state_key *a, struct pf_state_key *b)
{
int diff;
int extfilter;
if ((diff = a->proto - b->proto) != 0)
return (diff);
if ((diff = a->af - b->af) != 0)
return (diff);
extfilter = PF_EXTFILTER_APD;
switch (a->proto) {
case IPPROTO_ICMP:
case IPPROTO_ICMPV6:
if ((diff = a->gwy.xport.port - b->gwy.xport.port) != 0)
return (diff);
break;
case IPPROTO_TCP:
if ((diff = a->ext.xport.port - b->ext.xport.port) != 0)
return (diff);
if ((diff = a->gwy.xport.port - b->gwy.xport.port) != 0)
return (diff);
break;
case IPPROTO_UDP:
if ((diff = a->proto_variant - b->proto_variant))
return (diff);
extfilter = a->proto_variant;
if ((diff = a->gwy.xport.port - b->gwy.xport.port) != 0)
return (diff);
if ((extfilter < PF_EXTFILTER_AD) &&
(diff = a->ext.xport.port - b->ext.xport.port) != 0)
return (diff);
break;
case IPPROTO_GRE:
if (a->proto_variant == PF_GRE_PPTP_VARIANT &&
a->proto_variant == b->proto_variant) {
if (!!(diff = a->gwy.xport.call_id -
b->gwy.xport.call_id))
return (diff);
}
break;
case IPPROTO_ESP:
if (!!(diff = a->gwy.xport.spi - b->gwy.xport.spi))
return (diff);
break;
default:
break;
}
switch (a->af) {
#if INET
case AF_INET:
if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
return (1);
if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
return (-1);
if (extfilter < PF_EXTFILTER_EI) {
if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
return (1);
if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
return (-1);
}
break;
#endif
#if INET6
case AF_INET6:
if (a->gwy.addr.addr32[3] > b->gwy.addr.addr32[3])
return (1);
if (a->gwy.addr.addr32[3] < b->gwy.addr.addr32[3])
return (-1);
if (a->gwy.addr.addr32[2] > b->gwy.addr.addr32[2])
return (1);
if (a->gwy.addr.addr32[2] < b->gwy.addr.addr32[2])
return (-1);
if (a->gwy.addr.addr32[1] > b->gwy.addr.addr32[1])
return (1);
if (a->gwy.addr.addr32[1] < b->gwy.addr.addr32[1])
return (-1);
if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
return (1);
if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
return (-1);
if (extfilter < PF_EXTFILTER_EI ||
!PF_AZERO(&b->ext.addr, AF_INET6)) {
if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
return (1);
if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
return (-1);
if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
return (1);
if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
return (-1);
if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
return (1);
if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
return (-1);
if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
return (1);
if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
return (-1);
}
break;
#endif
}
if (a->app_state && b->app_state) {
if (a->app_state->compare_ext_gwy &&
b->app_state->compare_ext_gwy) {
diff = (const char *)b->app_state->compare_ext_gwy -
(const char *)a->app_state->compare_ext_gwy;
if (diff != 0)
return (diff);
diff = a->app_state->compare_ext_gwy(a->app_state,
b->app_state);
if (diff != 0)
return (diff);
}
}
return (0);
}
static __inline int
pf_state_compare_id(struct pf_state *a, struct pf_state *b)
{
if (a->id > b->id)
return (1);
if (a->id < b->id)
return (-1);
if (a->creatorid > b->creatorid)
return (1);
if (a->creatorid < b->creatorid)
return (-1);
return (0);
}
#if INET6
void
pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
{
switch (af) {
#if INET
case AF_INET:
dst->addr32[0] = src->addr32[0];
break;
#endif
case AF_INET6:
dst->addr32[0] = src->addr32[0];
dst->addr32[1] = src->addr32[1];
dst->addr32[2] = src->addr32[2];
dst->addr32[3] = src->addr32[3];
break;
}
}
#endif
struct pf_state *
pf_find_state_byid(struct pf_state_cmp *key)
{
pf_status.fcounters[FCNT_STATE_SEARCH]++;
return (RB_FIND(pf_state_tree_id, &tree_id,
(struct pf_state *)(void *)key));
}
static struct pf_state *
pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir)
{
struct pf_state_key *sk = NULL;
struct pf_state *s;
pf_status.fcounters[FCNT_STATE_SEARCH]++;
switch (dir) {
case PF_OUT:
sk = RB_FIND(pf_state_tree_lan_ext, &pf_statetbl_lan_ext,
(struct pf_state_key *)key);
break;
case PF_IN:
sk = RB_FIND(pf_state_tree_ext_gwy, &pf_statetbl_ext_gwy,
(struct pf_state_key *)key);
break;
default:
panic("pf_find_state");
}
if (sk != NULL)
TAILQ_FOREACH(s, &sk->states, next)
if (s->kif == pfi_all || s->kif == kif)
return (s);
return (NULL);
}
struct pf_state *
pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more)
{
struct pf_state_key *sk = NULL;
struct pf_state *s, *ret = NULL;
pf_status.fcounters[FCNT_STATE_SEARCH]++;
switch (dir) {
case PF_OUT:
sk = RB_FIND(pf_state_tree_lan_ext,
&pf_statetbl_lan_ext, (struct pf_state_key *)key);
break;
case PF_IN:
sk = RB_FIND(pf_state_tree_ext_gwy,
&pf_statetbl_ext_gwy, (struct pf_state_key *)key);
break;
default:
panic("pf_find_state_all");
}
if (sk != NULL) {
ret = TAILQ_FIRST(&sk->states);
if (more == NULL)
return (ret);
TAILQ_FOREACH(s, &sk->states, next)
(*more)++;
}
return (ret);
}
static void
pf_init_threshold(struct pf_threshold *threshold,
u_int32_t limit, u_int32_t seconds)
{
threshold->limit = limit * PF_THRESHOLD_MULT;
threshold->seconds = seconds;
threshold->count = 0;
threshold->last = pf_time_second();
}
static void
pf_add_threshold(struct pf_threshold *threshold)
{
u_int32_t t = pf_time_second(), diff = t - threshold->last;
if (diff >= threshold->seconds)
threshold->count = 0;
else
threshold->count -= threshold->count * diff /
threshold->seconds;
threshold->count += PF_THRESHOLD_MULT;
threshold->last = t;
}
static int
pf_check_threshold(struct pf_threshold *threshold)
{
return (threshold->count > threshold->limit);
}
static int
pf_src_connlimit(struct pf_state **state)
{
int bad = 0;
(*state)->src_node->conn++;
VERIFY((*state)->src_node->conn != 0);
(*state)->src.tcp_est = 1;
pf_add_threshold(&(*state)->src_node->conn_rate);
if ((*state)->rule.ptr->max_src_conn &&
(*state)->rule.ptr->max_src_conn <
(*state)->src_node->conn) {
pf_status.lcounters[LCNT_SRCCONN]++;
bad++;
}
if ((*state)->rule.ptr->max_src_conn_rate.limit &&
pf_check_threshold(&(*state)->src_node->conn_rate)) {
pf_status.lcounters[LCNT_SRCCONNRATE]++;
bad++;
}
if (!bad)
return (0);
if ((*state)->rule.ptr->overload_tbl) {
struct pfr_addr p;
u_int32_t killed = 0;
pf_status.lcounters[LCNT_OVERLOAD_TABLE]++;
if (pf_status.debug >= PF_DEBUG_MISC) {
printf("pf_src_connlimit: blocking address ");
pf_print_host(&(*state)->src_node->addr, 0,
(*state)->state_key->af);
}
bzero(&p, sizeof (p));
p.pfra_af = (*state)->state_key->af;
switch ((*state)->state_key->af) {
#if INET
case AF_INET:
p.pfra_net = 32;
p.pfra_ip4addr = (*state)->src_node->addr.v4;
break;
#endif
#if INET6
case AF_INET6:
p.pfra_net = 128;
p.pfra_ip6addr = (*state)->src_node->addr.v6;
break;
#endif
}
pfr_insert_kentry((*state)->rule.ptr->overload_tbl,
&p, pf_calendar_time_second());
if ((*state)->rule.ptr->flush) {
struct pf_state_key *sk;
struct pf_state *st;
pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++;
RB_FOREACH(st, pf_state_tree_id, &tree_id) {
sk = st->state_key;
if (sk->af ==
(*state)->state_key->af &&
(((*state)->state_key->direction ==
PF_OUT &&
PF_AEQ(&(*state)->src_node->addr,
&sk->lan.addr, sk->af)) ||
((*state)->state_key->direction == PF_IN &&
PF_AEQ(&(*state)->src_node->addr,
&sk->ext.addr, sk->af))) &&
((*state)->rule.ptr->flush &
PF_FLUSH_GLOBAL ||
(*state)->rule.ptr == st->rule.ptr)) {
st->timeout = PFTM_PURGE;
st->src.state = st->dst.state =
TCPS_CLOSED;
killed++;
}
}
if (pf_status.debug >= PF_DEBUG_MISC)
printf(", %u states killed", killed);
}
if (pf_status.debug >= PF_DEBUG_MISC)
printf("\n");
}
(*state)->timeout = PFTM_PURGE;
(*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
return (1);
}
int
pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
struct pf_addr *src, sa_family_t af)
{
struct pf_src_node k;
if (*sn == NULL) {
k.af = af;
PF_ACPY(&k.addr, src, af);
if (rule->rule_flag & PFRULE_RULESRCTRACK ||
rule->rpool.opts & PF_POOL_STICKYADDR)
k.rule.ptr = rule;
else
k.rule.ptr = NULL;
pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
*sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
}
if (*sn == NULL) {
if (!rule->max_src_nodes ||
rule->src_nodes < rule->max_src_nodes)
(*sn) = pool_get(&pf_src_tree_pl, PR_WAITOK);
else
pf_status.lcounters[LCNT_SRCNODES]++;
if ((*sn) == NULL)
return (-1);
bzero(*sn, sizeof (struct pf_src_node));
pf_init_threshold(&(*sn)->conn_rate,
rule->max_src_conn_rate.limit,
rule->max_src_conn_rate.seconds);
(*sn)->af = af;
if (rule->rule_flag & PFRULE_RULESRCTRACK ||
rule->rpool.opts & PF_POOL_STICKYADDR)
(*sn)->rule.ptr = rule;
else
(*sn)->rule.ptr = NULL;
PF_ACPY(&(*sn)->addr, src, af);
if (RB_INSERT(pf_src_tree,
&tree_src_tracking, *sn) != NULL) {
if (pf_status.debug >= PF_DEBUG_MISC) {
printf("pf: src_tree insert failed: ");
pf_print_host(&(*sn)->addr, 0, af);
printf("\n");
}
pool_put(&pf_src_tree_pl, *sn);
return (-1);
}
(*sn)->creation = pf_time_second();
(*sn)->ruletype = rule->action;
if ((*sn)->rule.ptr != NULL)
(*sn)->rule.ptr->src_nodes++;
pf_status.scounters[SCNT_SRC_NODE_INSERT]++;
pf_status.src_nodes++;
} else {
if (rule->max_src_states &&
(*sn)->states >= rule->max_src_states) {
pf_status.lcounters[LCNT_SRCSTATES]++;
return (-1);
}
}
return (0);
}
static void
pf_stateins_err(const char *tree, struct pf_state *s, struct pfi_kif *kif)
{
struct pf_state_key *sk = s->state_key;
if (pf_status.debug >= PF_DEBUG_MISC) {
printf("pf: state insert failed: %s %s ", tree, kif->pfik_name);
switch (sk->proto) {
case IPPROTO_TCP:
printf("TCP");
break;
case IPPROTO_UDP:
printf("UDP");
break;
case IPPROTO_ICMP:
printf("ICMP4");
break;
case IPPROTO_ICMPV6:
printf("ICMP6");
break;
default:
printf("PROTO=%u", sk->proto);
break;
}
printf(" lan: ");
pf_print_sk_host(&sk->lan, sk->af, sk->proto,
sk->proto_variant);
printf(" gwy: ");
pf_print_sk_host(&sk->gwy, sk->af, sk->proto,
sk->proto_variant);
printf(" ext: ");
pf_print_sk_host(&sk->ext, sk->af, sk->proto,
sk->proto_variant);
if (s->sync_flags & PFSTATE_FROMSYNC)
printf(" (from sync)");
printf("\n");
}
}
int
pf_insert_state(struct pfi_kif *kif, struct pf_state *s)
{
struct pf_state_key *cur;
struct pf_state *sp;
VERIFY(s->state_key != NULL);
s->kif = kif;
if ((cur = RB_INSERT(pf_state_tree_lan_ext, &pf_statetbl_lan_ext,
s->state_key)) != NULL) {
TAILQ_FOREACH(sp, &cur->states, next)
if (sp->kif == kif) {
pf_stateins_err("tree_lan_ext", s, kif);
pf_detach_state(s,
PF_DT_SKIP_LANEXT|PF_DT_SKIP_EXTGWY);
return (-1);
}
pf_detach_state(s, PF_DT_SKIP_LANEXT|PF_DT_SKIP_EXTGWY);
pf_attach_state(cur, s, kif == pfi_all ? 1 : 0);
}
if (cur == NULL && (cur = RB_INSERT(pf_state_tree_ext_gwy,
&pf_statetbl_ext_gwy, s->state_key)) != NULL) {
pf_stateins_err("tree_ext_gwy", s, kif);
pf_detach_state(s, PF_DT_SKIP_EXTGWY);
return (-1);
}
if (s->id == 0 && s->creatorid == 0) {
s->id = htobe64(pf_status.stateid++);
s->creatorid = pf_status.hostid;
}
if (RB_INSERT(pf_state_tree_id, &tree_id, s) != NULL) {
if (pf_status.debug >= PF_DEBUG_MISC) {
printf("pf: state insert failed: "
"id: %016llx creatorid: %08x",
be64toh(s->id), ntohl(s->creatorid));
if (s->sync_flags & PFSTATE_FROMSYNC)
printf(" (from sync)");
printf("\n");
}
pf_detach_state(s, 0);
return (-1);
}
TAILQ_INSERT_TAIL(&state_list, s, entry_list);
pf_status.fcounters[FCNT_STATE_INSERT]++;
pf_status.states++;
VERIFY(pf_status.states != 0);
pfi_kif_ref(kif, PFI_KIF_REF_STATE);
#if NPFSYNC
pfsync_insert_state(s);
#endif
return (0);
}
static int
pf_purge_thread_cont(int err)
{
#pragma unused(err)
static u_int32_t nloops = 0;
int t = 1;
lck_rw_lock_shared(pf_perim_lock);
lck_mtx_lock(pf_lock);
if (!pf_status.running) {
pf_purge_expired_states(pf_status.states);
pf_purge_expired_fragments();
pf_purge_expired_src_nodes();
if (pf_purge_thread == NULL) {
lck_mtx_unlock(pf_lock);
lck_rw_done(pf_perim_lock);
thread_deallocate(current_thread());
thread_terminate(current_thread());
return (0);
} else {
if (pf_status.states == 0 &&
pf_normalize_isempty() &&
RB_EMPTY(&tree_src_tracking)) {
nloops = 0;
t = 0;
}
goto done;
}
}
pf_purge_expired_states(1 + (pf_status.states
/ pf_default_rule.timeout[PFTM_INTERVAL]));
if (++nloops >= pf_default_rule.timeout[PFTM_INTERVAL]) {
pf_purge_expired_fragments();
pf_purge_expired_src_nodes();
nloops = 0;
}
done:
lck_mtx_unlock(pf_lock);
lck_rw_done(pf_perim_lock);
(void) tsleep0(pf_purge_thread_fn, PWAIT, "pf_purge_cont",
t * hz, pf_purge_thread_cont);
VERIFY(0);
return (0);
}
void
pf_purge_thread_fn(void *v, wait_result_t w)
{
#pragma unused(v, w)
(void) tsleep0(pf_purge_thread_fn, PWAIT, "pf_purge", 0,
pf_purge_thread_cont);
VERIFY(0);
}
u_int64_t
pf_state_expires(const struct pf_state *state)
{
u_int32_t t;
u_int32_t start;
u_int32_t end;
u_int32_t states;
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
if (state->timeout == PFTM_PURGE)
return (pf_time_second());
if (state->timeout == PFTM_UNTIL_PACKET)
return (0);
VERIFY(state->timeout != PFTM_UNLINKED);
VERIFY(state->timeout < PFTM_MAX);
t = state->rule.ptr->timeout[state->timeout];
if (!t)
t = pf_default_rule.timeout[state->timeout];
start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
if (start) {
end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
states = state->rule.ptr->states;
} else {
start = pf_default_rule.timeout[PFTM_ADAPTIVE_START];
end = pf_default_rule.timeout[PFTM_ADAPTIVE_END];
states = pf_status.states;
}
if (end && states > start && start < end) {
if (states < end)
return (state->expire + t * (end - states) /
(end - start));
else
return (pf_time_second());
}
return (state->expire + t);
}
void
pf_purge_expired_src_nodes(void)
{
struct pf_src_node *cur, *next;
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) {
next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur);
if (cur->states <= 0 && cur->expire <= pf_time_second()) {
if (cur->rule.ptr != NULL) {
cur->rule.ptr->src_nodes--;
if (cur->rule.ptr->states <= 0 &&
cur->rule.ptr->max_src_nodes <= 0)
pf_rm_rule(NULL, cur->rule.ptr);
}
RB_REMOVE(pf_src_tree, &tree_src_tracking, cur);
pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
pf_status.src_nodes--;
pool_put(&pf_src_tree_pl, cur);
}
}
}
void
pf_src_tree_remove_state(struct pf_state *s)
{
u_int32_t t;
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
if (s->src_node != NULL) {
if (s->src.tcp_est) {
VERIFY(s->src_node->conn > 0);
--s->src_node->conn;
}
VERIFY(s->src_node->states > 0);
if (--s->src_node->states <= 0) {
t = s->rule.ptr->timeout[PFTM_SRC_NODE];
if (!t)
t = pf_default_rule.timeout[PFTM_SRC_NODE];
s->src_node->expire = pf_time_second() + t;
}
}
if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
VERIFY(s->nat_src_node->states > 0);
if (--s->nat_src_node->states <= 0) {
t = s->rule.ptr->timeout[PFTM_SRC_NODE];
if (!t)
t = pf_default_rule.timeout[PFTM_SRC_NODE];
s->nat_src_node->expire = pf_time_second() + t;
}
}
s->src_node = s->nat_src_node = NULL;
}
void
pf_unlink_state(struct pf_state *cur)
{
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
if (cur->src.state == PF_TCPS_PROXY_DST) {
pf_send_tcp(cur->rule.ptr, cur->state_key->af,
&cur->state_key->ext.addr, &cur->state_key->lan.addr,
cur->state_key->ext.xport.port,
cur->state_key->lan.xport.port,
cur->src.seqhi, cur->src.seqlo + 1,
TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL);
}
hook_runloop(&cur->unlink_hooks, HOOK_REMOVE|HOOK_FREE);
RB_REMOVE(pf_state_tree_id, &tree_id, cur);
#if NPFSYNC
if (cur->creatorid == pf_status.hostid)
pfsync_delete_state(cur);
#endif
cur->timeout = PFTM_UNLINKED;
pf_src_tree_remove_state(cur);
pf_detach_state(cur, 0);
}
void
pf_free_state(struct pf_state *cur)
{
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
#if NPFSYNC
if (pfsyncif != NULL &&
(pfsyncif->sc_bulk_send_next == cur ||
pfsyncif->sc_bulk_terminator == cur))
return;
#endif
VERIFY(cur->timeout == PFTM_UNLINKED);
VERIFY(cur->rule.ptr->states > 0);
if (--cur->rule.ptr->states <= 0 &&
cur->rule.ptr->src_nodes <= 0)
pf_rm_rule(NULL, cur->rule.ptr);
if (cur->nat_rule.ptr != NULL) {
VERIFY(cur->nat_rule.ptr->states > 0);
if (--cur->nat_rule.ptr->states <= 0 &&
cur->nat_rule.ptr->src_nodes <= 0)
pf_rm_rule(NULL, cur->nat_rule.ptr);
}
if (cur->anchor.ptr != NULL) {
VERIFY(cur->anchor.ptr->states > 0);
if (--cur->anchor.ptr->states <= 0)
pf_rm_rule(NULL, cur->anchor.ptr);
}
pf_normalize_tcp_cleanup(cur);
pfi_kif_unref(cur->kif, PFI_KIF_REF_STATE);
TAILQ_REMOVE(&state_list, cur, entry_list);
if (cur->tag)
pf_tag_unref(cur->tag);
pool_put(&pf_state_pl, cur);
pf_status.fcounters[FCNT_STATE_REMOVALS]++;
VERIFY(pf_status.states > 0);
pf_status.states--;
}
void
pf_purge_expired_states(u_int32_t maxcheck)
{
static struct pf_state *cur = NULL;
struct pf_state *next;
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
while (maxcheck--) {
if (cur == NULL) {
cur = TAILQ_FIRST(&state_list);
if (cur == NULL)
break;
}
next = TAILQ_NEXT(cur, entry_list);
if (cur->timeout == PFTM_UNLINKED) {
pf_free_state(cur);
} else if (pf_state_expires(cur) <= pf_time_second()) {
pf_unlink_state(cur);
pf_free_state(cur);
}
cur = next;
}
}
int
pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw)
{
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
if (aw->type != PF_ADDR_TABLE)
return (0);
if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL)
return (1);
return (0);
}
void
pf_tbladdr_remove(struct pf_addr_wrap *aw)
{
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL)
return;
pfr_detach_table(aw->p.tbl);
aw->p.tbl = NULL;
}
void
pf_tbladdr_copyout(struct pf_addr_wrap *aw)
{
struct pfr_ktable *kt = aw->p.tbl;
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
if (aw->type != PF_ADDR_TABLE || kt == NULL)
return;
if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL)
kt = kt->pfrkt_root;
aw->p.tbl = NULL;
aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ?
kt->pfrkt_cnt : -1;
}
static void
pf_print_addr(struct pf_addr *addr, sa_family_t af)
{
switch (af) {
#if INET
case AF_INET: {
u_int32_t a = ntohl(addr->addr32[0]);
printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
(a>>8)&255, a&255);
break;
}
#endif
#if INET6
case AF_INET6: {
u_int16_t b;
u_int8_t i, curstart = 255, curend = 0,
maxstart = 0, maxend = 0;
for (i = 0; i < 8; i++) {
if (!addr->addr16[i]) {
if (curstart == 255)
curstart = i;
else
curend = i;
} else {
if (curstart) {
if ((curend - curstart) >
(maxend - maxstart)) {
maxstart = curstart;
maxend = curend;
curstart = 255;
}
}
}
}
for (i = 0; i < 8; i++) {
if (i >= maxstart && i <= maxend) {
if (maxend != 7) {
if (i == maxstart)
printf(":");
} else {
if (i == maxend)
printf(":");
}
} else {
b = ntohs(addr->addr16[i]);
printf("%x", b);
if (i < 7)
printf(":");
}
}
break;
}
#endif
}
}
static void
pf_print_sk_host(struct pf_state_host *sh, sa_family_t af, int proto,
u_int8_t proto_variant)
{
pf_print_addr(&sh->addr, af);
switch (proto) {
case IPPROTO_ESP:
if (sh->xport.spi)
printf("[%08x]", ntohl(sh->xport.spi));
break;
case IPPROTO_GRE:
if (proto_variant == PF_GRE_PPTP_VARIANT)
printf("[%u]", ntohs(sh->xport.call_id));
break;
case IPPROTO_TCP:
case IPPROTO_UDP:
printf("[%u]", ntohs(sh->xport.port));
break;
default:
break;
}
}
static void
pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
{
pf_print_addr(addr, af);
if (p)
printf("[%u]", ntohs(p));
}
void
pf_print_state(struct pf_state *s)
{
struct pf_state_key *sk = s->state_key;
switch (sk->proto) {
case IPPROTO_ESP:
printf("ESP ");
break;
case IPPROTO_GRE:
printf("GRE%u ", sk->proto_variant);
break;
case IPPROTO_TCP:
printf("TCP ");
break;
case IPPROTO_UDP:
printf("UDP ");
break;
case IPPROTO_ICMP:
printf("ICMP ");
break;
case IPPROTO_ICMPV6:
printf("ICMPV6 ");
break;
default:
printf("%u ", sk->proto);
break;
}
pf_print_sk_host(&sk->lan, sk->af, sk->proto, sk->proto_variant);
printf(" ");
pf_print_sk_host(&sk->gwy, sk->af, sk->proto, sk->proto_variant);
printf(" ");
pf_print_sk_host(&sk->ext, sk->af, sk->proto, sk->proto_variant);
printf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo,
s->src.seqhi, s->src.max_win, s->src.seqdiff);
if (s->src.wscale && s->dst.wscale)
printf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK);
printf("]");
printf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo,
s->dst.seqhi, s->dst.max_win, s->dst.seqdiff);
if (s->src.wscale && s->dst.wscale)
printf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK);
printf("]");
printf(" %u:%u", s->src.state, s->dst.state);
}
void
pf_print_flags(u_int8_t f)
{
if (f)
printf(" ");
if (f & TH_FIN)
printf("F");
if (f & TH_SYN)
printf("S");
if (f & TH_RST)
printf("R");
if (f & TH_PUSH)
printf("P");
if (f & TH_ACK)
printf("A");
if (f & TH_URG)
printf("U");
if (f & TH_ECE)
printf("E");
if (f & TH_CWR)
printf("W");
}
#define PF_SET_SKIP_STEPS(i) \
do { \
while (head[i] != cur) { \
head[i]->skip[i].ptr = cur; \
head[i] = TAILQ_NEXT(head[i], entries); \
} \
} while (0)
void
pf_calc_skip_steps(struct pf_rulequeue *rules)
{
struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
int i;
cur = TAILQ_FIRST(rules);
prev = cur;
for (i = 0; i < PF_SKIP_COUNT; ++i)
head[i] = cur;
while (cur != NULL) {
if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
PF_SET_SKIP_STEPS(PF_SKIP_IFP);
if (cur->direction != prev->direction)
PF_SET_SKIP_STEPS(PF_SKIP_DIR);
if (cur->af != prev->af)
PF_SET_SKIP_STEPS(PF_SKIP_AF);
if (cur->proto != prev->proto)
PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
if (cur->src.neg != prev->src.neg ||
pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
{
union pf_rule_xport *cx = &cur->src.xport;
union pf_rule_xport *px = &prev->src.xport;
switch (cur->proto) {
case IPPROTO_GRE:
case IPPROTO_ESP:
PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
break;
default:
if (prev->proto == IPPROTO_GRE ||
prev->proto == IPPROTO_ESP ||
cx->range.op != px->range.op ||
cx->range.port[0] != px->range.port[0] ||
cx->range.port[1] != px->range.port[1])
PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
break;
}
}
if (cur->dst.neg != prev->dst.neg ||
pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
{
union pf_rule_xport *cx = &cur->dst.xport;
union pf_rule_xport *px = &prev->dst.xport;
switch (cur->proto) {
case IPPROTO_GRE:
if (cur->proto != prev->proto ||
cx->call_id != px->call_id)
PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
break;
case IPPROTO_ESP:
if (cur->proto != prev->proto ||
cx->spi != px->spi)
PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
break;
default:
if (prev->proto == IPPROTO_GRE ||
prev->proto == IPPROTO_ESP ||
cx->range.op != px->range.op ||
cx->range.port[0] != px->range.port[0] ||
cx->range.port[1] != px->range.port[1])
PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
break;
}
}
prev = cur;
cur = TAILQ_NEXT(cur, entries);
}
for (i = 0; i < PF_SKIP_COUNT; ++i)
PF_SET_SKIP_STEPS(i);
}
u_int32_t
pf_calc_state_key_flowhash(struct pf_state_key *sk)
{
struct pf_flowhash_key fh __attribute__((aligned(8)));
bzero(&fh, sizeof (fh));
if (PF_ALEQ(&sk->lan.addr, &sk->ext.addr, sk->af)) {
bcopy(&sk->lan.addr, &fh.ap1.addr, sizeof (fh.ap1.addr));
bcopy(&sk->ext.addr, &fh.ap2.addr, sizeof (fh.ap2.addr));
} else {
bcopy(&sk->ext.addr, &fh.ap1.addr, sizeof (fh.ap1.addr));
bcopy(&sk->lan.addr, &fh.ap2.addr, sizeof (fh.ap2.addr));
}
if (sk->lan.xport.spi <= sk->ext.xport.spi) {
fh.ap1.xport.spi = sk->lan.xport.spi;
fh.ap2.xport.spi = sk->ext.xport.spi;
} else {
fh.ap1.xport.spi = sk->ext.xport.spi;
fh.ap2.xport.spi = sk->lan.xport.spi;
}
fh.af = sk->af;
fh.proto = sk->proto;
return (net_flowhash(&fh, sizeof (fh), pf_hash_seed));
}
static int
pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
{
if (aw1->type != aw2->type)
return (1);
switch (aw1->type) {
case PF_ADDR_ADDRMASK:
case PF_ADDR_RANGE:
if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0))
return (1);
if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0))
return (1);
return (0);
case PF_ADDR_DYNIFTL:
return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
case PF_ADDR_NOROUTE:
case PF_ADDR_URPFFAILED:
return (0);
case PF_ADDR_TABLE:
return (aw1->p.tbl != aw2->p.tbl);
case PF_ADDR_RTLABEL:
return (aw1->v.rtlabel != aw2->v.rtlabel);
default:
printf("invalid address type: %d\n", aw1->type);
return (1);
}
}
u_int16_t
pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
{
u_int32_t l;
if (udp && !cksum)
return (0);
l = cksum + old - new;
l = (l >> 16) + (l & 0xffff);
l = l & 0xffff;
if (udp && !l)
return (0xffff);
return (l);
}
static void
pf_change_ap(int dir, struct mbuf *m, struct pf_addr *a, u_int16_t *p,
u_int16_t *ic, u_int16_t *pc, struct pf_addr *an, u_int16_t pn,
u_int8_t u, sa_family_t af)
{
struct pf_addr ao;
u_int16_t po = *p;
PF_ACPY(&ao, a, af);
PF_ACPY(a, an, af);
*p = pn;
switch (af) {
#if INET
case AF_INET:
*ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
ao.addr16[0], an->addr16[0], 0),
ao.addr16[1], an->addr16[1], 0);
*p = pn;
if (dir == PF_OUT && m != NULL &&
(m->m_flags & M_PKTHDR) &&
(m->m_pkthdr.csum_flags & (CSUM_TCP | CSUM_UDP))) {
*pc = ~pf_cksum_fixup(pf_cksum_fixup(~*pc,
ao.addr16[0], an->addr16[0], u),
ao.addr16[1], an->addr16[1], u);
} else {
*pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
ao.addr16[0], an->addr16[0], u),
ao.addr16[1], an->addr16[1], u),
po, pn, u);
}
break;
#endif
#if INET6
case AF_INET6:
if (dir == PF_OUT && m != NULL &&
(m->m_flags & M_PKTHDR) &&
(m->m_pkthdr.csum_flags & (CSUM_TCPIPV6 | CSUM_UDPIPV6))) {
*pc = ~pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(~*pc,
ao.addr16[0], an->addr16[0], u),
ao.addr16[1], an->addr16[1], u),
ao.addr16[2], an->addr16[2], u),
ao.addr16[3], an->addr16[3], u),
ao.addr16[4], an->addr16[4], u),
ao.addr16[5], an->addr16[5], u),
ao.addr16[6], an->addr16[6], u),
ao.addr16[7], an->addr16[7], u),
po, pn, u);
} else {
*pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
ao.addr16[0], an->addr16[0], u),
ao.addr16[1], an->addr16[1], u),
ao.addr16[2], an->addr16[2], u),
ao.addr16[3], an->addr16[3], u),
ao.addr16[4], an->addr16[4], u),
ao.addr16[5], an->addr16[5], u),
ao.addr16[6], an->addr16[6], u),
ao.addr16[7], an->addr16[7], u),
po, pn, u);
}
break;
#endif
}
}
void
pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
{
u_int32_t ao;
memcpy(&ao, a, sizeof (ao));
memcpy(a, &an, sizeof (u_int32_t));
*c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
ao % 65536, an % 65536, u);
}
#if INET6
static void
pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
{
struct pf_addr ao;
PF_ACPY(&ao, a, AF_INET6);
PF_ACPY(a, an, AF_INET6);
*c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
pf_cksum_fixup(pf_cksum_fixup(*c,
ao.addr16[0], an->addr16[0], u),
ao.addr16[1], an->addr16[1], u),
ao.addr16[2], an->addr16[2], u),
ao.addr16[3], an->addr16[3], u),
ao.addr16[4], an->addr16[4], u),
ao.addr16[5], an->addr16[5], u),
ao.addr16[6], an->addr16[6], u),
ao.addr16[7], an->addr16[7], u);
}
#endif
static void
pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
{
struct pf_addr oia, ooa;
PF_ACPY(&oia, ia, af);
PF_ACPY(&ooa, oa, af);
if (ip != NULL) {
u_int16_t oip = *ip;
u_int32_t opc = 0;
if (pc != NULL)
opc = *pc;
*ip = np;
if (pc != NULL)
*pc = pf_cksum_fixup(*pc, oip, *ip, u);
*ic = pf_cksum_fixup(*ic, oip, *ip, 0);
if (pc != NULL)
*ic = pf_cksum_fixup(*ic, opc, *pc, 0);
}
PF_ACPY(ia, na, af);
switch (af) {
#if INET
case AF_INET: {
u_int32_t oh2c = *h2c;
*h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
oia.addr16[0], ia->addr16[0], 0),
oia.addr16[1], ia->addr16[1], 0);
*ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
oia.addr16[0], ia->addr16[0], 0),
oia.addr16[1], ia->addr16[1], 0);
*ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
break;
}
#endif
#if INET6
case AF_INET6:
*ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
pf_cksum_fixup(pf_cksum_fixup(*ic,
oia.addr16[0], ia->addr16[0], u),
oia.addr16[1], ia->addr16[1], u),
oia.addr16[2], ia->addr16[2], u),
oia.addr16[3], ia->addr16[3], u),
oia.addr16[4], ia->addr16[4], u),
oia.addr16[5], ia->addr16[5], u),
oia.addr16[6], ia->addr16[6], u),
oia.addr16[7], ia->addr16[7], u);
break;
#endif
}
PF_ACPY(oa, na, af);
switch (af) {
#if INET
case AF_INET:
*hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
ooa.addr16[0], oa->addr16[0], 0),
ooa.addr16[1], oa->addr16[1], 0);
break;
#endif
#if INET6
case AF_INET6:
*ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
pf_cksum_fixup(pf_cksum_fixup(*ic,
ooa.addr16[0], oa->addr16[0], u),
ooa.addr16[1], oa->addr16[1], u),
ooa.addr16[2], oa->addr16[2], u),
ooa.addr16[3], oa->addr16[3], u),
ooa.addr16[4], oa->addr16[4], u),
ooa.addr16[5], oa->addr16[5], u),
ooa.addr16[6], oa->addr16[6], u),
ooa.addr16[7], oa->addr16[7], u);
break;
#endif
}
}
static int
pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd,
struct tcphdr *th, struct pf_state_peer *dst)
{
int hlen = (th->th_off << 2) - sizeof (*th), thoptlen = hlen;
u_int8_t opts[MAX_TCPOPTLEN], *opt = opts;
int copyback = 0, i, olen;
struct sackblk sack;
#define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2)
if (hlen < TCPOLEN_SACKLEN ||
!pf_pull_hdr(m, off + sizeof (*th), opts, hlen, NULL, NULL, pd->af))
return (0);
while (hlen >= TCPOLEN_SACKLEN) {
olen = opt[1];
switch (*opt) {
case TCPOPT_EOL:
case TCPOPT_NOP:
opt++;
hlen--;
break;
case TCPOPT_SACK:
if (olen > hlen)
olen = hlen;
if (olen >= TCPOLEN_SACKLEN) {
for (i = 2; i + TCPOLEN_SACK <= olen;
i += TCPOLEN_SACK) {
memcpy(&sack, &opt[i], sizeof (sack));
pf_change_a(&sack.start, &th->th_sum,
htonl(ntohl(sack.start) -
dst->seqdiff), 0);
pf_change_a(&sack.end, &th->th_sum,
htonl(ntohl(sack.end) -
dst->seqdiff), 0);
memcpy(&opt[i], &sack, sizeof (sack));
}
copyback = off + sizeof (*th) + thoptlen;
}
default:
if (olen < 2)
olen = 2;
hlen -= olen;
opt += olen;
}
}
if (copyback) {
m = pf_lazy_makewritable(pd, m, copyback);
if (!m)
return (-1);
m_copyback(m, off + sizeof (*th), thoptlen, opts);
}
return (copyback);
}
static void
pf_send_tcp(const struct pf_rule *r, sa_family_t af,
const struct pf_addr *saddr, const struct pf_addr *daddr,
u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp)
{
#pragma unused(eh, ifp)
struct mbuf *m;
int len, tlen;
#if INET
struct ip *h = NULL;
#endif
#if INET6
struct ip6_hdr *h6 = NULL;
#endif
struct tcphdr *th = NULL;
char *opt;
struct pf_mtag *pf_mtag;
tlen = sizeof (struct tcphdr);
if (mss)
tlen += 4;
switch (af) {
#if INET
case AF_INET:
len = sizeof (struct ip) + tlen;
break;
#endif
#if INET6
case AF_INET6:
len = sizeof (struct ip6_hdr) + tlen;
break;
#endif
default:
panic("pf_send_tcp: not AF_INET or AF_INET6!");
return;
}
m = m_gethdr(M_DONTWAIT, MT_HEADER);
if (m == NULL)
return;
if ((pf_mtag = pf_get_mtag(m)) == NULL) {
m_free(m);
return;
}
if (tag)
pf_mtag->pftag_flags |= PF_TAG_GENERATED;
pf_mtag->pftag_tag = rtag;
if (r != NULL && PF_RTABLEID_IS_VALID(r->rtableid))
pf_mtag->pftag_rtableid = r->rtableid;
#if PF_ALTQ
if (altq_allowed && r != NULL && r->qid)
pf_mtag->pftag_qid = r->qid;
#endif
pf_mtag->pftag_hdr = mtod(m, struct ip *);
pf_mtag->pftag_flags &= ~(PF_TAG_HDR_INET | PF_TAG_HDR_INET6);
switch (af) {
#if INET
case AF_INET:
pf_mtag->pftag_flags |= PF_TAG_HDR_INET;
break;
#endif
#if INET6
case AF_INET6:
pf_mtag->pftag_flags |= PF_TAG_HDR_INET6;
break;
#endif
}
pf_mtag->pftag_flags |= PF_TAG_TCP;
m->m_data += max_linkhdr;
m->m_pkthdr.len = m->m_len = len;
m->m_pkthdr.rcvif = NULL;
bzero(m->m_data, len);
switch (af) {
#if INET
case AF_INET:
h = mtod(m, struct ip *);
h->ip_p = IPPROTO_TCP;
h->ip_len = htons(tlen);
h->ip_src.s_addr = saddr->v4.s_addr;
h->ip_dst.s_addr = daddr->v4.s_addr;
th = (struct tcphdr *)(void *)((caddr_t)h + sizeof (struct ip));
break;
#endif
#if INET6
case AF_INET6:
h6 = mtod(m, struct ip6_hdr *);
h6->ip6_nxt = IPPROTO_TCP;
h6->ip6_plen = htons(tlen);
memcpy(&h6->ip6_src, &saddr->v6, sizeof (struct in6_addr));
memcpy(&h6->ip6_dst, &daddr->v6, sizeof (struct in6_addr));
th = (struct tcphdr *)(void *)
((caddr_t)h6 + sizeof (struct ip6_hdr));
break;
#endif
}
th->th_sport = sport;
th->th_dport = dport;
th->th_seq = htonl(seq);
th->th_ack = htonl(ack);
th->th_off = tlen >> 2;
th->th_flags = flags;
th->th_win = htons(win);
if (mss) {
opt = (char *)(th + 1);
opt[0] = TCPOPT_MAXSEG;
opt[1] = 4;
#if BYTE_ORDER != BIG_ENDIAN
HTONS(mss);
#endif
bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
}
switch (af) {
#if INET
case AF_INET: {
struct route ro;
th->th_sum = in_cksum(m, len);
h->ip_v = 4;
h->ip_hl = sizeof (*h) >> 2;
h->ip_tos = IPTOS_LOWDELAY;
h->ip_len = len;
h->ip_off = (path_mtu_discovery ? IP_DF : 0);
h->ip_ttl = ttl ? ttl : ip_defttl;
h->ip_sum = 0;
bzero(&ro, sizeof (ro));
ip_output(m, NULL, &ro, 0, NULL, NULL);
if (ro.ro_rt != NULL)
rtfree(ro.ro_rt);
break;
}
#endif
#if INET6
case AF_INET6: {
struct route_in6 ro6;
th->th_sum = in6_cksum(m, IPPROTO_TCP,
sizeof (struct ip6_hdr), tlen);
h6->ip6_vfc |= IPV6_VERSION;
h6->ip6_hlim = IPV6_DEFHLIM;
bzero(&ro6, sizeof (ro6));
ip6_output(m, NULL, &ro6, 0, NULL, NULL, NULL);
if (ro6.ro_rt != NULL)
rtfree(ro6.ro_rt);
break;
}
#endif
}
}
static void
pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
struct pf_rule *r)
{
struct mbuf *m0;
struct pf_mtag *pf_mtag;
m0 = m_copy(m, 0, M_COPYALL);
if (m0 == NULL)
return;
if ((pf_mtag = pf_get_mtag(m0)) == NULL)
return;
pf_mtag->pftag_flags |= PF_TAG_GENERATED;
if (PF_RTABLEID_IS_VALID(r->rtableid))
pf_mtag->pftag_rtableid = r->rtableid;
#if PF_ALTQ
if (altq_allowed && r->qid)
pf_mtag->pftag_qid = r->qid;
#endif
pf_mtag->pftag_hdr = mtod(m0, struct ip *);
pf_mtag->pftag_flags &=
~(PF_TAG_HDR_INET | PF_TAG_HDR_INET6 | PF_TAG_TCP);
switch (af) {
#if INET
case AF_INET:
pf_mtag->pftag_flags |= PF_TAG_HDR_INET;
break;
#endif
#if INET6
case AF_INET6:
pf_mtag->pftag_flags |= PF_TAG_HDR_INET6;
break;
#endif
}
switch (af) {
#if INET
case AF_INET:
icmp_error(m0, type, code, 0, 0);
break;
#endif
#if INET6
case AF_INET6:
icmp6_error(m0, type, code, 0);
break;
#endif
}
}
int
pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
struct pf_addr *b, sa_family_t af)
{
int match = 0;
switch (af) {
#if INET
case AF_INET:
if ((a->addr32[0] & m->addr32[0]) ==
(b->addr32[0] & m->addr32[0]))
match++;
break;
#endif
#if INET6
case AF_INET6:
if (((a->addr32[0] & m->addr32[0]) ==
(b->addr32[0] & m->addr32[0])) &&
((a->addr32[1] & m->addr32[1]) ==
(b->addr32[1] & m->addr32[1])) &&
((a->addr32[2] & m->addr32[2]) ==
(b->addr32[2] & m->addr32[2])) &&
((a->addr32[3] & m->addr32[3]) ==
(b->addr32[3] & m->addr32[3])))
match++;
break;
#endif
}
if (match) {
if (n)
return (0);
else
return (1);
} else {
if (n)
return (1);
else
return (0);
}
}
int
pf_match_addr_range(struct pf_addr *b, struct pf_addr *e,
struct pf_addr *a, sa_family_t af)
{
switch (af) {
#if INET
case AF_INET:
if ((a->addr32[0] < b->addr32[0]) ||
(a->addr32[0] > e->addr32[0]))
return (0);
break;
#endif
#if INET6
case AF_INET6: {
int i;
for (i = 0; i < 4; ++i)
if (a->addr32[i] > b->addr32[i])
break;
else if (a->addr32[i] < b->addr32[i])
return (0);
for (i = 0; i < 4; ++i)
if (a->addr32[i] < e->addr32[i])
break;
else if (a->addr32[i] > e->addr32[i])
return (0);
break;
}
#endif
}
return (1);
}
int
pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
{
switch (op) {
case PF_OP_IRG:
return ((p > a1) && (p < a2));
case PF_OP_XRG:
return ((p < a1) || (p > a2));
case PF_OP_RRG:
return ((p >= a1) && (p <= a2));
case PF_OP_EQ:
return (p == a1);
case PF_OP_NE:
return (p != a1);
case PF_OP_LT:
return (p < a1);
case PF_OP_LE:
return (p <= a1);
case PF_OP_GT:
return (p > a1);
case PF_OP_GE:
return (p >= a1);
}
return (0);
}
int
pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
{
#if BYTE_ORDER != BIG_ENDIAN
NTOHS(a1);
NTOHS(a2);
NTOHS(p);
#endif
return (pf_match(op, a1, a2, p));
}
int
pf_match_xport(u_int8_t proto, u_int8_t proto_variant, union pf_rule_xport *rx,
union pf_state_xport *sx)
{
int d = !0;
if (sx) {
switch (proto) {
case IPPROTO_GRE:
if (proto_variant == PF_GRE_PPTP_VARIANT)
d = (rx->call_id == sx->call_id);
break;
case IPPROTO_ESP:
d = (rx->spi == sx->spi);
break;
case IPPROTO_TCP:
case IPPROTO_UDP:
case IPPROTO_ICMP:
case IPPROTO_ICMPV6:
if (rx->range.op)
d = pf_match_port(rx->range.op,
rx->range.port[0], rx->range.port[1],
sx->port);
break;
default:
break;
}
}
return (d);
}
int
pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
{
if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
return (0);
return (pf_match(op, a1, a2, u));
}
int
pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
{
if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
return (0);
return (pf_match(op, a1, a2, g));
}
static int
pf_match_tag(struct mbuf *m, struct pf_rule *r, struct pf_mtag *pf_mtag,
int *tag)
{
#pragma unused(m)
if (*tag == -1)
*tag = pf_mtag->pftag_tag;
return ((!r->match_tag_not && r->match_tag == *tag) ||
(r->match_tag_not && r->match_tag != *tag));
}
int
pf_tag_packet(struct mbuf *m, struct pf_mtag *pf_mtag, int tag,
unsigned int rtableid, struct pf_pdesc *pd)
{
if (tag <= 0 && !PF_RTABLEID_IS_VALID(rtableid) &&
(pd == NULL || pd->flowhash == 0))
return (0);
if (pf_mtag == NULL && (pf_mtag = pf_get_mtag(m)) == NULL)
return (1);
if (tag > 0)
pf_mtag->pftag_tag = tag;
if (PF_RTABLEID_IS_VALID(rtableid))
pf_mtag->pftag_rtableid = rtableid;
if (pd != NULL && pd->flowhash != 0) {
pf_mtag->pftag_flags |= PF_TAG_FLOWHASH;
pf_mtag->pftag_flowhash = pd->flowhash;
pf_mtag->pftag_flags |= (pd->flags & PFDESC_FLOW_ADV) ?
PF_TAG_FLOWADV : 0;
}
return (0);
}
void
pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n,
struct pf_rule **r, struct pf_rule **a, int *match)
{
struct pf_anchor_stackframe *f;
(*r)->anchor->match = 0;
if (match)
*match = 0;
if (*depth >= (int)sizeof (pf_anchor_stack) /
(int)sizeof (pf_anchor_stack[0])) {
printf("pf_step_into_anchor: stack overflow\n");
*r = TAILQ_NEXT(*r, entries);
return;
} else if (*depth == 0 && a != NULL)
*a = *r;
f = pf_anchor_stack + (*depth)++;
f->rs = *rs;
f->r = *r;
if ((*r)->anchor_wildcard) {
f->parent = &(*r)->anchor->children;
if ((f->child = RB_MIN(pf_anchor_node, f->parent)) ==
NULL) {
*r = NULL;
return;
}
*rs = &f->child->ruleset;
} else {
f->parent = NULL;
f->child = NULL;
*rs = &(*r)->anchor->ruleset;
}
*r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
}
int
pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n,
struct pf_rule **r, struct pf_rule **a, int *match)
{
struct pf_anchor_stackframe *f;
int quick = 0;
do {
if (*depth <= 0)
break;
f = pf_anchor_stack + *depth - 1;
if (f->parent != NULL && f->child != NULL) {
if (f->child->match ||
(match != NULL && *match)) {
f->r->anchor->match = 1;
*match = 0;
}
f->child = RB_NEXT(pf_anchor_node, f->parent, f->child);
if (f->child != NULL) {
*rs = &f->child->ruleset;
*r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
if (*r == NULL)
continue;
else
break;
}
}
(*depth)--;
if (*depth == 0 && a != NULL)
*a = NULL;
*rs = f->rs;
if (f->r->anchor->match || (match != NULL && *match))
quick = f->r->quick;
*r = TAILQ_NEXT(f->r, entries);
} while (*r == NULL);
return (quick);
}
#if INET6
void
pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
{
switch (af) {
#if INET
case AF_INET:
naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
((rmask->addr32[0] ^ 0xffffffff) & saddr->addr32[0]);
break;
#endif
case AF_INET6:
naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
((rmask->addr32[0] ^ 0xffffffff) & saddr->addr32[0]);
naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
((rmask->addr32[1] ^ 0xffffffff) & saddr->addr32[1]);
naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
((rmask->addr32[2] ^ 0xffffffff) & saddr->addr32[2]);
naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
((rmask->addr32[3] ^ 0xffffffff) & saddr->addr32[3]);
break;
}
}
void
pf_addr_inc(struct pf_addr *addr, sa_family_t af)
{
switch (af) {
#if INET
case AF_INET:
addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
break;
#endif
case AF_INET6:
if (addr->addr32[3] == 0xffffffff) {
addr->addr32[3] = 0;
if (addr->addr32[2] == 0xffffffff) {
addr->addr32[2] = 0;
if (addr->addr32[1] == 0xffffffff) {
addr->addr32[1] = 0;
addr->addr32[0] =
htonl(ntohl(addr->addr32[0]) + 1);
} else
addr->addr32[1] =
htonl(ntohl(addr->addr32[1]) + 1);
} else
addr->addr32[2] =
htonl(ntohl(addr->addr32[2]) + 1);
} else
addr->addr32[3] =
htonl(ntohl(addr->addr32[3]) + 1);
break;
}
}
#endif
#define mix(a, b, c) \
do { \
a -= b; a -= c; a ^= (c >> 13); \
b -= c; b -= a; b ^= (a << 8); \
c -= a; c -= b; c ^= (b >> 13); \
a -= b; a -= c; a ^= (c >> 12); \
b -= c; b -= a; b ^= (a << 16); \
c -= a; c -= b; c ^= (b >> 5); \
a -= b; a -= c; a ^= (c >> 3); \
b -= c; b -= a; b ^= (a << 10); \
c -= a; c -= b; c ^= (b >> 15); \
} while (0)
static void
pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
struct pf_poolhashkey *key, sa_family_t af)
{
u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0];
switch (af) {
#if INET
case AF_INET:
a += inaddr->addr32[0];
b += key->key32[1];
mix(a, b, c);
hash->addr32[0] = c + key->key32[2];
break;
#endif
#if INET6
case AF_INET6:
a += inaddr->addr32[0];
b += inaddr->addr32[2];
mix(a, b, c);
hash->addr32[0] = c;
a += inaddr->addr32[1];
b += inaddr->addr32[3];
c += key->key32[1];
mix(a, b, c);
hash->addr32[1] = c;
a += inaddr->addr32[2];
b += inaddr->addr32[1];
c += key->key32[2];
mix(a, b, c);
hash->addr32[2] = c;
a += inaddr->addr32[3];
b += inaddr->addr32[0];
c += key->key32[3];
mix(a, b, c);
hash->addr32[3] = c;
break;
#endif
}
}
static int
pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr,
struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn)
{
unsigned char hash[16];
struct pf_pool *rpool = &r->rpool;
struct pf_addr *raddr = &rpool->cur->addr.v.a.addr;
struct pf_addr *rmask = &rpool->cur->addr.v.a.mask;
struct pf_pooladdr *acur = rpool->cur;
struct pf_src_node k;
if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR &&
(r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
k.af = af;
PF_ACPY(&k.addr, saddr, af);
if (r->rule_flag & PFRULE_RULESRCTRACK ||
r->rpool.opts & PF_POOL_STICKYADDR)
k.rule.ptr = r;
else
k.rule.ptr = NULL;
pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
*sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) {
PF_ACPY(naddr, &(*sn)->raddr, af);
if (pf_status.debug >= PF_DEBUG_MISC) {
printf("pf_map_addr: src tracking maps ");
pf_print_host(&k.addr, 0, af);
printf(" to ");
pf_print_host(naddr, 0, af);
printf("\n");
}
return (0);
}
}
if (rpool->cur->addr.type == PF_ADDR_NOROUTE)
return (1);
if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
switch (af) {
#if INET
case AF_INET:
if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
(rpool->opts & PF_POOL_TYPEMASK) !=
PF_POOL_ROUNDROBIN)
return (1);
raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
break;
#endif
#if INET6
case AF_INET6:
if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
(rpool->opts & PF_POOL_TYPEMASK) !=
PF_POOL_ROUNDROBIN)
return (1);
raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
break;
#endif
}
} else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN)
return (1);
} else {
raddr = &rpool->cur->addr.v.a.addr;
rmask = &rpool->cur->addr.v.a.mask;
}
switch (rpool->opts & PF_POOL_TYPEMASK) {
case PF_POOL_NONE:
PF_ACPY(naddr, raddr, af);
break;
case PF_POOL_BITMASK:
PF_POOLMASK(naddr, raddr, rmask, saddr, af);
break;
case PF_POOL_RANDOM:
if (init_addr != NULL && PF_AZERO(init_addr, af)) {
switch (af) {
#if INET
case AF_INET:
rpool->counter.addr32[0] = htonl(random());
break;
#endif
#if INET6
case AF_INET6:
if (rmask->addr32[3] != 0xffffffff)
rpool->counter.addr32[3] =
htonl(random());
else
break;
if (rmask->addr32[2] != 0xffffffff)
rpool->counter.addr32[2] =
htonl(random());
else
break;
if (rmask->addr32[1] != 0xffffffff)
rpool->counter.addr32[1] =
htonl(random());
else
break;
if (rmask->addr32[0] != 0xffffffff)
rpool->counter.addr32[0] =
htonl(random());
break;
#endif
}
PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
PF_ACPY(init_addr, naddr, af);
} else {
PF_AINC(&rpool->counter, af);
PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
}
break;
case PF_POOL_SRCHASH:
pf_hash(saddr, (struct pf_addr *)(void *)&hash,
&rpool->key, af);
PF_POOLMASK(naddr, raddr, rmask,
(struct pf_addr *)(void *)&hash, af);
break;
case PF_POOL_ROUNDROBIN:
if (rpool->cur->addr.type == PF_ADDR_TABLE) {
if (!pfr_pool_get(rpool->cur->addr.p.tbl,
&rpool->tblidx, &rpool->counter,
&raddr, &rmask, af))
goto get_addr;
} else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
&rpool->tblidx, &rpool->counter,
&raddr, &rmask, af))
goto get_addr;
} else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
goto get_addr;
try_next:
if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL)
rpool->cur = TAILQ_FIRST(&rpool->list);
if (rpool->cur->addr.type == PF_ADDR_TABLE) {
rpool->tblidx = -1;
if (pfr_pool_get(rpool->cur->addr.p.tbl,
&rpool->tblidx, &rpool->counter,
&raddr, &rmask, af)) {
if (rpool->cur != acur)
goto try_next;
return (1);
}
} else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
rpool->tblidx = -1;
if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
&rpool->tblidx, &rpool->counter,
&raddr, &rmask, af)) {
if (rpool->cur != acur)
goto try_next;
return (1);
}
} else {
raddr = &rpool->cur->addr.v.a.addr;
rmask = &rpool->cur->addr.v.a.mask;
PF_ACPY(&rpool->counter, raddr, af);
}
get_addr:
PF_ACPY(naddr, &rpool->counter, af);
if (init_addr != NULL && PF_AZERO(init_addr, af))
PF_ACPY(init_addr, naddr, af);
PF_AINC(&rpool->counter, af);
break;
}
if (*sn != NULL)
PF_ACPY(&(*sn)->raddr, naddr, af);
if (pf_status.debug >= PF_DEBUG_MISC &&
(rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
printf("pf_map_addr: selected address ");
pf_print_host(naddr, 0, af);
printf("\n");
}
return (0);
}
static int
pf_get_sport(struct pf_pdesc *pd, struct pfi_kif *kif, struct pf_rule *r,
struct pf_addr *saddr, union pf_state_xport *sxport, struct pf_addr *daddr,
union pf_state_xport *dxport, struct pf_addr *naddr,
union pf_state_xport *nxport, struct pf_src_node **sn)
{
#pragma unused(kif)
struct pf_state_key_cmp key;
struct pf_addr init_addr;
unsigned int cut;
sa_family_t af = pd->af;
u_int8_t proto = pd->proto;
unsigned int low = r->rpool.proxy_port[0];
unsigned int high = r->rpool.proxy_port[1];
bzero(&init_addr, sizeof (init_addr));
if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
return (1);
if (proto == IPPROTO_ICMP) {
low = 1;
high = 65535;
}
if (!nxport)
return (0);
if (proto == IPPROTO_UDP) {
if (ntohs(sxport->port) == PF_IKE_PORT) {
nxport->port = sxport->port;
return (0);
}
if (r->extmap > PF_EXTMAP_APD) {
struct pf_state *s;
TAILQ_FOREACH(s, &state_list, entry_list) {
struct pf_state_key *sk = s->state_key;
if (!sk)
continue;
if (s->nat_rule.ptr != r)
continue;
if (sk->proto != IPPROTO_UDP || sk->af != af)
continue;
if (sk->lan.xport.port != sxport->port)
continue;
if (PF_ANEQ(&sk->lan.addr, saddr, af))
continue;
if (r->extmap < PF_EXTMAP_EI &&
PF_ANEQ(&sk->ext.addr, daddr, af))
continue;
nxport->port = sk->gwy.xport.port;
return (0);
}
}
} else if (proto == IPPROTO_TCP) {
struct pf_state* s;
TAILQ_FOREACH(s, &state_list, entry_list) {
struct pf_state_key* sk = s->state_key;
if (!sk)
continue;
if (s->nat_rule.ptr != r)
continue;
if (sk->proto != IPPROTO_TCP || sk->af != af)
continue;
if (sk->lan.xport.port != sxport->port)
continue;
if (!(PF_AEQ(&sk->lan.addr, saddr, af)))
continue;
nxport->port = sk->gwy.xport.port;
return (0);
}
}
do {
key.af = af;
key.proto = proto;
PF_ACPY(&key.ext.addr, daddr, key.af);
PF_ACPY(&key.gwy.addr, naddr, key.af);
switch (proto) {
case IPPROTO_UDP:
key.proto_variant = r->extfilter;
break;
default:
key.proto_variant = 0;
break;
}
if (dxport)
key.ext.xport = *dxport;
else
memset(&key.ext.xport, 0, sizeof (key.ext.xport));
if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP ||
proto == IPPROTO_ICMP)) {
if (dxport)
key.gwy.xport = *dxport;
else
memset(&key.gwy.xport, 0,
sizeof (key.ext.xport));
if (pf_find_state_all(&key, PF_IN, NULL) == NULL)
return (0);
} else if (low == 0 && high == 0) {
key.gwy.xport = *nxport;
if (pf_find_state_all(&key, PF_IN, NULL) == NULL)
return (0);
} else if (low == high) {
key.gwy.xport.port = htons(low);
if (pf_find_state_all(&key, PF_IN, NULL) == NULL) {
nxport->port = htons(low);
return (0);
}
} else {
unsigned int tmp;
if (low > high) {
tmp = low;
low = high;
high = tmp;
}
cut = htonl(random()) % (1 + high - low) + low;
for (tmp = cut; tmp <= high; ++(tmp)) {
key.gwy.xport.port = htons(tmp);
if (pf_find_state_all(&key, PF_IN, NULL) ==
NULL) {
nxport->port = htons(tmp);
return (0);
}
}
for (tmp = cut - 1; tmp >= low; --(tmp)) {
key.gwy.xport.port = htons(tmp);
if (pf_find_state_all(&key, PF_IN, NULL) ==
NULL) {
nxport->port = htons(tmp);
return (0);
}
}
}
switch (r->rpool.opts & PF_POOL_TYPEMASK) {
case PF_POOL_RANDOM:
case PF_POOL_ROUNDROBIN:
if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
return (1);
break;
case PF_POOL_NONE:
case PF_POOL_SRCHASH:
case PF_POOL_BITMASK:
default:
return (1);
}
} while (!PF_AEQ(&init_addr, naddr, af));
return (1);
}
static struct pf_rule *
pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
int direction, struct pfi_kif *kif, struct pf_addr *saddr,
union pf_state_xport *sxport, struct pf_addr *daddr,
union pf_state_xport *dxport, int rs_num)
{
struct pf_rule *r, *rm = NULL;
struct pf_ruleset *ruleset = NULL;
int tag = -1;
unsigned int rtableid = IFSCOPE_NONE;
int asd = 0;
r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr);
while (r && rm == NULL) {
struct pf_rule_addr *src = NULL, *dst = NULL;
struct pf_addr_wrap *xdst = NULL;
struct pf_addr_wrap *xsrc = NULL;
union pf_rule_xport rdrxport;
if (r->action == PF_BINAT && direction == PF_IN) {
src = &r->dst;
if (r->rpool.cur != NULL)
xdst = &r->rpool.cur->addr;
} else if (r->action == PF_RDR && direction == PF_OUT) {
dst = &r->src;
src = &r->dst;
if (r->rpool.cur != NULL) {
rdrxport.range.op = PF_OP_EQ;
rdrxport.range.port[0] =
htons(r->rpool.proxy_port[0]);
xsrc = &r->rpool.cur->addr;
}
} else {
src = &r->src;
dst = &r->dst;
}
r->evaluations++;
if (pfi_kif_match(r->kif, kif) == r->ifnot)
r = r->skip[PF_SKIP_IFP].ptr;
else if (r->direction && r->direction != direction)
r = r->skip[PF_SKIP_DIR].ptr;
else if (r->af && r->af != pd->af)
r = r->skip[PF_SKIP_AF].ptr;
else if (r->proto && r->proto != pd->proto)
r = r->skip[PF_SKIP_PROTO].ptr;
else if (xsrc && PF_MISMATCHAW(xsrc, saddr, pd->af, 0, NULL))
r = TAILQ_NEXT(r, entries);
else if (!xsrc && PF_MISMATCHAW(&src->addr, saddr, pd->af,
src->neg, kif))
r = TAILQ_NEXT(r, entries);
else if (xsrc && (!rdrxport.range.port[0] ||
!pf_match_xport(r->proto, r->proto_variant, &rdrxport,
sxport)))
r = TAILQ_NEXT(r, entries);
else if (!xsrc && !pf_match_xport(r->proto,
r->proto_variant, &src->xport, sxport))
r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
PF_SKIP_DST_PORT].ptr;
else if (dst != NULL &&
PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL))
r = r->skip[PF_SKIP_DST_ADDR].ptr;
else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af,
0, NULL))
r = TAILQ_NEXT(r, entries);
else if (dst && !pf_match_xport(r->proto, r->proto_variant,
&dst->xport, dxport))
r = r->skip[PF_SKIP_DST_PORT].ptr;
else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag))
r = TAILQ_NEXT(r, entries);
else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m,
off, pd->hdr.tcp), r->os_fingerprint)))
r = TAILQ_NEXT(r, entries);
else {
if (r->tag)
tag = r->tag;
if (PF_RTABLEID_IS_VALID(r->rtableid))
rtableid = r->rtableid;
if (r->anchor == NULL) {
rm = r;
} else
pf_step_into_anchor(&asd, &ruleset, rs_num,
&r, NULL, NULL);
}
if (r == NULL)
pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r,
NULL, NULL);
}
if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid, NULL))
return (NULL);
if (rm != NULL && (rm->action == PF_NONAT ||
rm->action == PF_NORDR || rm->action == PF_NOBINAT))
return (NULL);
return (rm);
}
static struct pf_rule *
pf_get_translation_aux(struct pf_pdesc *pd, struct mbuf *m, int off,
int direction, struct pfi_kif *kif, struct pf_src_node **sn,
struct pf_addr *saddr, union pf_state_xport *sxport, struct pf_addr *daddr,
union pf_state_xport *dxport, struct pf_addr *naddr,
union pf_state_xport *nxport)
{
struct pf_rule *r = NULL;
if (direction == PF_OUT) {
r = pf_match_translation(pd, m, off, direction, kif, saddr,
sxport, daddr, dxport, PF_RULESET_BINAT);
if (r == NULL)
r = pf_match_translation(pd, m, off, direction, kif,
saddr, sxport, daddr, dxport, PF_RULESET_RDR);
if (r == NULL)
r = pf_match_translation(pd, m, off, direction, kif,
saddr, sxport, daddr, dxport, PF_RULESET_NAT);
} else {
r = pf_match_translation(pd, m, off, direction, kif, saddr,
sxport, daddr, dxport, PF_RULESET_RDR);
if (r == NULL)
r = pf_match_translation(pd, m, off, direction, kif,
saddr, sxport, daddr, dxport, PF_RULESET_BINAT);
}
if (r != NULL) {
switch (r->action) {
case PF_NONAT:
case PF_NOBINAT:
case PF_NORDR:
return (NULL);
case PF_NAT:
if (pf_get_sport(pd, kif, r, saddr, sxport, daddr,
dxport, naddr, nxport, sn)) {
DPFPRINTF(PF_DEBUG_MISC,
("pf: NAT proxy port allocation "
"(%u-%u) failed\n",
r->rpool.proxy_port[0],
r->rpool.proxy_port[1]));
return (NULL);
}
break;
case PF_BINAT:
switch (direction) {
case PF_OUT:
if (r->rpool.cur->addr.type ==
PF_ADDR_DYNIFTL) {
switch (pd->af) {
#if INET
case AF_INET:
if (r->rpool.cur->addr.p.dyn->
pfid_acnt4 < 1)
return (NULL);
PF_POOLMASK(naddr,
&r->rpool.cur->addr.p.dyn->
pfid_addr4,
&r->rpool.cur->addr.p.dyn->
pfid_mask4,
saddr, AF_INET);
break;
#endif
#if INET6
case AF_INET6:
if (r->rpool.cur->addr.p.dyn->
pfid_acnt6 < 1)
return (NULL);
PF_POOLMASK(naddr,
&r->rpool.cur->addr.p.dyn->
pfid_addr6,
&r->rpool.cur->addr.p.dyn->
pfid_mask6,
saddr, AF_INET6);
break;
#endif
}
} else {
PF_POOLMASK(naddr,
&r->rpool.cur->addr.v.a.addr,
&r->rpool.cur->addr.v.a.mask,
saddr, pd->af);
}
break;
case PF_IN:
if (r->src.addr.type == PF_ADDR_DYNIFTL) {
switch (pd->af) {
#if INET
case AF_INET:
if (r->src.addr.p.dyn->
pfid_acnt4 < 1)
return (NULL);
PF_POOLMASK(naddr,
&r->src.addr.p.dyn->
pfid_addr4,
&r->src.addr.p.dyn->
pfid_mask4,
daddr, AF_INET);
break;
#endif
#if INET6
case AF_INET6:
if (r->src.addr.p.dyn->
pfid_acnt6 < 1)
return (NULL);
PF_POOLMASK(naddr,
&r->src.addr.p.dyn->
pfid_addr6,
&r->src.addr.p.dyn->
pfid_mask6,
daddr, AF_INET6);
break;
#endif
}
} else
PF_POOLMASK(naddr,
&r->src.addr.v.a.addr,
&r->src.addr.v.a.mask, daddr,
pd->af);
break;
}
break;
case PF_RDR: {
switch (direction) {
case PF_OUT:
if (r->dst.addr.type == PF_ADDR_DYNIFTL) {
switch (pd->af) {
#if INET
case AF_INET:
if (r->dst.addr.p.dyn->
pfid_acnt4 < 1)
return (NULL);
PF_POOLMASK(naddr,
&r->dst.addr.p.dyn->
pfid_addr4,
&r->dst.addr.p.dyn->
pfid_mask4,
daddr, AF_INET);
break;
#endif
#if INET6
case AF_INET6:
if (r->dst.addr.p.dyn->
pfid_acnt6 < 1)
return (NULL);
PF_POOLMASK(naddr,
&r->dst.addr.p.dyn->
pfid_addr6,
&r->dst.addr.p.dyn->
pfid_mask6,
daddr, AF_INET6);
break;
#endif
}
} else {
PF_POOLMASK(naddr,
&r->dst.addr.v.a.addr,
&r->dst.addr.v.a.mask,
daddr, pd->af);
}
if (nxport && r->dst.xport.range.port[0])
nxport->port =
r->dst.xport.range.port[0];
break;
case PF_IN:
if (pf_map_addr(pd->af, r, saddr,
naddr, NULL, sn))
return (NULL);
if ((r->rpool.opts & PF_POOL_TYPEMASK) ==
PF_POOL_BITMASK)
PF_POOLMASK(naddr, naddr,
&r->rpool.cur->addr.v.a.mask, daddr,
pd->af);
if (nxport && dxport) {
if (r->rpool.proxy_port[1]) {
u_int32_t tmp_nport;
tmp_nport =
((ntohs(dxport->port) -
ntohs(r->dst.xport.range.
port[0])) %
(r->rpool.proxy_port[1] -
r->rpool.proxy_port[0] +
1)) + r->rpool.proxy_port[0];
if (tmp_nport > 65535)
tmp_nport -= 65535;
nxport->port =
htons((u_int16_t)tmp_nport);
} else if (r->rpool.proxy_port[0]) {
nxport->port = htons(r->rpool.
proxy_port[0]);
}
}
break;
}
break;
}
default:
return (NULL);
}
}
return (r);
}
int
pf_socket_lookup(int direction, struct pf_pdesc *pd)
{
struct pf_addr *saddr, *daddr;
u_int16_t sport, dport;
struct inpcbinfo *pi;
int inp = 0;
if (pd == NULL)
return (-1);
pd->lookup.uid = UID_MAX;
pd->lookup.gid = GID_MAX;
pd->lookup.pid = NO_PID;
switch (pd->proto) {
case IPPROTO_TCP:
if (pd->hdr.tcp == NULL)
return (-1);
sport = pd->hdr.tcp->th_sport;
dport = pd->hdr.tcp->th_dport;
pi = &tcbinfo;
break;
case IPPROTO_UDP:
if (pd->hdr.udp == NULL)
return (-1);
sport = pd->hdr.udp->uh_sport;
dport = pd->hdr.udp->uh_dport;
pi = &udbinfo;
break;
default:
return (-1);
}
if (direction == PF_IN) {
saddr = pd->src;
daddr = pd->dst;
} else {
u_int16_t p;
p = sport;
sport = dport;
dport = p;
saddr = pd->dst;
daddr = pd->src;
}
switch (pd->af) {
#if INET
case AF_INET:
inp = in_pcblookup_hash_exists(pi, saddr->v4, sport, daddr->v4, dport,
0, &pd->lookup.uid, &pd->lookup.gid, NULL);
#if INET6
if (inp == 0) {
struct in6_addr s6, d6;
memset(&s6, 0, sizeof (s6));
s6.s6_addr16[5] = htons(0xffff);
memcpy(&s6.s6_addr32[3], &saddr->v4,
sizeof (saddr->v4));
memset(&d6, 0, sizeof (d6));
d6.s6_addr16[5] = htons(0xffff);
memcpy(&d6.s6_addr32[3], &daddr->v4,
sizeof (daddr->v4));
inp = in6_pcblookup_hash_exists(pi, &s6, sport,
&d6, dport, 0, &pd->lookup.uid, &pd->lookup.gid, NULL);
if (inp == 0) {
inp = in_pcblookup_hash_exists(pi, saddr->v4, sport,
daddr->v4, dport, INPLOOKUP_WILDCARD, &pd->lookup.uid, &pd->lookup.gid, NULL);
if (inp == 0) {
inp = in6_pcblookup_hash_exists(pi, &s6, sport,
&d6, dport, INPLOOKUP_WILDCARD,
&pd->lookup.uid, &pd->lookup.gid, NULL);
if (inp == 0)
return (-1);
}
}
}
#else
if (inp == 0) {
inp = in_pcblookup_hash_exists(pi, saddr->v4, sport,
daddr->v4, dport, INPLOOKUP_WILDCARD,
&pd->lookup.uid, &pd->lookup.gid, NULL);
if (inp == 0)
return (-1);
}
#endif
break;
#endif
#if INET6
case AF_INET6:
inp = in6_pcblookup_hash_exists(pi, &saddr->v6, sport, &daddr->v6,
dport, 0, &pd->lookup.uid, &pd->lookup.gid, NULL);
if (inp == 0) {
inp = in6_pcblookup_hash_exists(pi, &saddr->v6, sport,
&daddr->v6, dport, INPLOOKUP_WILDCARD,
&pd->lookup.uid, &pd->lookup.gid, NULL);
if (inp == 0)
return (-1);
}
break;
#endif
default:
return (-1);
}
return (1);
}
static u_int8_t
pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
{
int hlen;
u_int8_t hdr[60];
u_int8_t *opt, optlen;
u_int8_t wscale = 0;
hlen = th_off << 2;
if (hlen <= (int)sizeof (struct tcphdr))
return (0);
if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
return (0);
opt = hdr + sizeof (struct tcphdr);
hlen -= sizeof (struct tcphdr);
while (hlen >= 3) {
switch (*opt) {
case TCPOPT_EOL:
case TCPOPT_NOP:
++opt;
--hlen;
break;
case TCPOPT_WINDOW:
wscale = opt[2];
if (wscale > TCP_MAX_WINSHIFT)
wscale = TCP_MAX_WINSHIFT;
wscale |= PF_WSCALE_FLAG;
default:
optlen = opt[1];
if (optlen < 2)
optlen = 2;
hlen -= optlen;
opt += optlen;
break;
}
}
return (wscale);
}
static u_int16_t
pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
{
int hlen;
u_int8_t hdr[60];
u_int8_t *opt, optlen;
u_int16_t mss = tcp_mssdflt;
hlen = th_off << 2;
if (hlen <= (int)sizeof (struct tcphdr))
return (0);
if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
return (0);
opt = hdr + sizeof (struct tcphdr);
hlen -= sizeof (struct tcphdr);
while (hlen >= TCPOLEN_MAXSEG) {
switch (*opt) {
case TCPOPT_EOL:
case TCPOPT_NOP:
++opt;
--hlen;
break;
case TCPOPT_MAXSEG:
bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
#if BYTE_ORDER != BIG_ENDIAN
NTOHS(mss);
#endif
default:
optlen = opt[1];
if (optlen < 2)
optlen = 2;
hlen -= optlen;
opt += optlen;
break;
}
}
return (mss);
}
static u_int16_t
pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer)
{
#if INET
struct sockaddr_in *dst;
struct route ro;
#endif
#if INET6
struct sockaddr_in6 *dst6;
struct route_in6 ro6;
#endif
struct rtentry *rt = NULL;
int hlen;
u_int16_t mss = tcp_mssdflt;
switch (af) {
#if INET
case AF_INET:
hlen = sizeof (struct ip);
bzero(&ro, sizeof (ro));
dst = (struct sockaddr_in *)(void *)&ro.ro_dst;
dst->sin_family = AF_INET;
dst->sin_len = sizeof (*dst);
dst->sin_addr = addr->v4;
rtalloc(&ro);
rt = ro.ro_rt;
break;
#endif
#if INET6
case AF_INET6:
hlen = sizeof (struct ip6_hdr);
bzero(&ro6, sizeof (ro6));
dst6 = (struct sockaddr_in6 *)(void *)&ro6.ro_dst;
dst6->sin6_family = AF_INET6;
dst6->sin6_len = sizeof (*dst6);
dst6->sin6_addr = addr->v6;
rtalloc((struct route *)&ro);
rt = ro6.ro_rt;
break;
#endif
default:
panic("pf_calc_mss: not AF_INET or AF_INET6!");
return (0);
}
if (rt && rt->rt_ifp) {
mss = rt->rt_ifp->if_mtu - hlen - sizeof (struct tcphdr);
mss = max(tcp_mssdflt, mss);
RTFREE(rt);
}
mss = min(mss, offer);
mss = max(mss, 64);
return (mss);
}
static void
pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr)
{
struct pf_rule *r = s->rule.ptr;
s->rt_kif = NULL;
if (!r->rt || r->rt == PF_FASTROUTE)
return;
switch (s->state_key->af) {
#if INET
case AF_INET:
pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL,
&s->nat_src_node);
s->rt_kif = r->rpool.cur->kif;
break;
#endif
#if INET6
case AF_INET6:
pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL,
&s->nat_src_node);
s->rt_kif = r->rpool.cur->kif;
break;
#endif
}
}
static void
pf_attach_state(struct pf_state_key *sk, struct pf_state *s, int tail)
{
s->state_key = sk;
sk->refcnt++;
if (tail)
TAILQ_INSERT_TAIL(&sk->states, s, next);
else
TAILQ_INSERT_HEAD(&sk->states, s, next);
}
static void
pf_detach_state(struct pf_state *s, int flags)
{
struct pf_state_key *sk = s->state_key;
if (sk == NULL)
return;
s->state_key = NULL;
TAILQ_REMOVE(&sk->states, s, next);
if (--sk->refcnt == 0) {
if (!(flags & PF_DT_SKIP_EXTGWY))
RB_REMOVE(pf_state_tree_ext_gwy,
&pf_statetbl_ext_gwy, sk);
if (!(flags & PF_DT_SKIP_LANEXT))
RB_REMOVE(pf_state_tree_lan_ext,
&pf_statetbl_lan_ext, sk);
if (sk->app_state)
pool_put(&pf_app_state_pl, sk->app_state);
pool_put(&pf_state_key_pl, sk);
}
}
struct pf_state_key *
pf_alloc_state_key(struct pf_state *s, struct pf_state_key *psk)
{
struct pf_state_key *sk;
if ((sk = pool_get(&pf_state_key_pl, PR_WAITOK)) == NULL)
return (NULL);
bzero(sk, sizeof (*sk));
TAILQ_INIT(&sk->states);
pf_attach_state(sk, s, 0);
if (psk != NULL) {
bcopy(&psk->lan, &sk->lan, sizeof (sk->lan));
bcopy(&psk->gwy, &sk->gwy, sizeof (sk->gwy));
bcopy(&psk->ext, &sk->ext, sizeof (sk->ext));
sk->af = psk->af;
sk->proto = psk->proto;
sk->direction = psk->direction;
sk->proto_variant = psk->proto_variant;
VERIFY(psk->app_state == NULL);
sk->flowhash = psk->flowhash;
}
return (sk);
}
static u_int32_t
pf_tcp_iss(struct pf_pdesc *pd)
{
MD5_CTX ctx;
u_int32_t digest[4];
if (pf_tcp_secret_init == 0) {
read_random(pf_tcp_secret, sizeof (pf_tcp_secret));
MD5Init(&pf_tcp_secret_ctx);
MD5Update(&pf_tcp_secret_ctx, pf_tcp_secret,
sizeof (pf_tcp_secret));
pf_tcp_secret_init = 1;
}
ctx = pf_tcp_secret_ctx;
MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof (u_short));
MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof (u_short));
if (pd->af == AF_INET6) {
MD5Update(&ctx, (char *)&pd->src->v6, sizeof (struct in6_addr));
MD5Update(&ctx, (char *)&pd->dst->v6, sizeof (struct in6_addr));
} else {
MD5Update(&ctx, (char *)&pd->src->v4, sizeof (struct in_addr));
MD5Update(&ctx, (char *)&pd->dst->v4, sizeof (struct in_addr));
}
MD5Final((u_char *)digest, &ctx);
pf_tcp_iss_off += 4096;
return (digest[0] + random() + pf_tcp_iss_off);
}
static int
pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction,
struct pfi_kif *kif, struct mbuf *m, int off, void *h,
struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm,
struct ifqueue *ifq)
{
#pragma unused(h)
struct pf_rule *nr = NULL;
struct pf_addr *saddr = pd->src, *daddr = pd->dst;
sa_family_t af = pd->af;
struct pf_rule *r, *a = NULL;
struct pf_ruleset *ruleset = NULL;
struct pf_src_node *nsn = NULL;
struct tcphdr *th = pd->hdr.tcp;
u_short reason;
int rewrite = 0, hdrlen = 0;
int tag = -1;
unsigned int rtableid = IFSCOPE_NONE;
int asd = 0;
int match = 0;
int state_icmp = 0;
u_int16_t mss = tcp_mssdflt;
u_int8_t icmptype = 0, icmpcode = 0;
struct pf_grev1_hdr *grev1 = pd->hdr.grev1;
union pf_state_xport bxport, nxport, sxport, dxport;
struct pf_state_key psk;
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
if (direction == PF_IN && pf_check_congestion(ifq)) {
REASON_SET(&reason, PFRES_CONGEST);
return (PF_DROP);
}
hdrlen = 0;
sxport.spi = 0;
dxport.spi = 0;
nxport.spi = 0;
switch (pd->proto) {
case IPPROTO_TCP:
sxport.port = th->th_sport;
dxport.port = th->th_dport;
hdrlen = sizeof (*th);
break;
case IPPROTO_UDP:
sxport.port = pd->hdr.udp->uh_sport;
dxport.port = pd->hdr.udp->uh_dport;
hdrlen = sizeof (*pd->hdr.udp);
break;
#if INET
case IPPROTO_ICMP:
if (pd->af != AF_INET)
break;
sxport.port = dxport.port = pd->hdr.icmp->icmp_id;
hdrlen = ICMP_MINLEN;
icmptype = pd->hdr.icmp->icmp_type;
icmpcode = pd->hdr.icmp->icmp_code;
if (icmptype == ICMP_UNREACH ||
icmptype == ICMP_SOURCEQUENCH ||
icmptype == ICMP_REDIRECT ||
icmptype == ICMP_TIMXCEED ||
icmptype == ICMP_PARAMPROB)
state_icmp++;
break;
#endif
#if INET6
case IPPROTO_ICMPV6:
if (pd->af != AF_INET6)
break;
sxport.port = dxport.port = pd->hdr.icmp6->icmp6_id;
hdrlen = sizeof (*pd->hdr.icmp6);
icmptype = pd->hdr.icmp6->icmp6_type;
icmpcode = pd->hdr.icmp6->icmp6_code;
if (icmptype == ICMP6_DST_UNREACH ||
icmptype == ICMP6_PACKET_TOO_BIG ||
icmptype == ICMP6_TIME_EXCEEDED ||
icmptype == ICMP6_PARAM_PROB)
state_icmp++;
break;
#endif
case IPPROTO_GRE:
if (pd->proto_variant == PF_GRE_PPTP_VARIANT) {
sxport.call_id = dxport.call_id =
pd->hdr.grev1->call_id;
hdrlen = sizeof (*pd->hdr.grev1);
}
break;
case IPPROTO_ESP:
sxport.spi = 0;
dxport.spi = pd->hdr.esp->spi;
hdrlen = sizeof (*pd->hdr.esp);
break;
}
r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
if (direction == PF_OUT) {
bxport = nxport = sxport;
if ((nr = pf_get_translation_aux(pd, m, off, PF_OUT, kif, &nsn,
saddr, &sxport, daddr, &dxport, &pd->naddr, &nxport)) !=
NULL) {
PF_ACPY(&pd->baddr, saddr, af);
switch (pd->proto) {
case IPPROTO_TCP:
pf_change_ap(direction, pd->mp, saddr,
&th->th_sport, pd->ip_sum, &th->th_sum,
&pd->naddr, nxport.port, 0, af);
sxport.port = th->th_sport;
rewrite++;
break;
case IPPROTO_UDP:
pf_change_ap(direction, pd->mp, saddr,
&pd->hdr.udp->uh_sport, pd->ip_sum,
&pd->hdr.udp->uh_sum, &pd->naddr,
nxport.port, 1, af);
sxport.port = pd->hdr.udp->uh_sport;
rewrite++;
break;
#if INET
case IPPROTO_ICMP:
if (pd->af == AF_INET) {
pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
pd->naddr.v4.s_addr, 0);
pd->hdr.icmp->icmp_cksum = pf_cksum_fixup(
pd->hdr.icmp->icmp_cksum, sxport.port,
nxport.port, 0);
pd->hdr.icmp->icmp_id = nxport.port;
++rewrite;
}
break;
#endif
#if INET6
case IPPROTO_ICMPV6:
if (pd->af == AF_INET6) {
pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
&pd->naddr, 0);
rewrite++;
}
break;
#endif
case IPPROTO_GRE:
switch (af) {
#if INET
case AF_INET:
pf_change_a(&saddr->v4.s_addr,
pd->ip_sum, pd->naddr.v4.s_addr, 0);
break;
#endif
#if INET6
case AF_INET6:
PF_ACPY(saddr, &pd->naddr, AF_INET6);
break;
#endif
}
++rewrite;
break;
case IPPROTO_ESP:
bxport.spi = 0;
switch (af) {
#if INET
case AF_INET:
pf_change_a(&saddr->v4.s_addr,
pd->ip_sum, pd->naddr.v4.s_addr, 0);
break;
#endif
#if INET6
case AF_INET6:
PF_ACPY(saddr, &pd->naddr, AF_INET6);
break;
#endif
}
break;
default:
switch (af) {
#if INET
case AF_INET:
pf_change_a(&saddr->v4.s_addr,
pd->ip_sum, pd->naddr.v4.s_addr, 0);
break;
#endif
#if INET6
case AF_INET6:
PF_ACPY(saddr, &pd->naddr, af);
break;
#endif
}
break;
}
if (nr->natpass)
r = NULL;
pd->nat_rule = nr;
}
} else {
bxport.port = nxport.port = dxport.port;
if ((nr = pf_get_translation_aux(pd, m, off, PF_IN, kif, &nsn,
saddr, &sxport, daddr, &dxport, &pd->naddr, &nxport)) !=
NULL) {
PF_ACPY(&pd->baddr, daddr, af);
switch (pd->proto) {
case IPPROTO_TCP:
pf_change_ap(direction, pd->mp, daddr,
&th->th_dport, pd->ip_sum, &th->th_sum,
&pd->naddr, nxport.port, 0, af);
dxport.port = th->th_dport;
rewrite++;
break;
case IPPROTO_UDP:
pf_change_ap(direction, pd->mp, daddr,
&pd->hdr.udp->uh_dport, pd->ip_sum,
&pd->hdr.udp->uh_sum, &pd->naddr,
nxport.port, 1, af);
dxport.port = pd->hdr.udp->uh_dport;
rewrite++;
break;
#if INET
case IPPROTO_ICMP:
if (pd->af == AF_INET) {
pf_change_a(&daddr->v4.s_addr, pd->ip_sum,
pd->naddr.v4.s_addr, 0);
}
break;
#endif
#if INET6
case IPPROTO_ICMPV6:
if (pd->af == AF_INET6) {
pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
&pd->naddr, 0);
rewrite++;
}
break;
#endif
case IPPROTO_GRE:
if (pd->proto_variant == PF_GRE_PPTP_VARIANT)
grev1->call_id = nxport.call_id;
switch (af) {
#if INET
case AF_INET:
pf_change_a(&daddr->v4.s_addr,
pd->ip_sum, pd->naddr.v4.s_addr, 0);
break;
#endif
#if INET6
case AF_INET6:
PF_ACPY(daddr, &pd->naddr, AF_INET6);
break;
#endif
}
++rewrite;
break;
case IPPROTO_ESP:
switch (af) {
#if INET
case AF_INET:
pf_change_a(&daddr->v4.s_addr,
pd->ip_sum, pd->naddr.v4.s_addr, 0);
break;
#endif
#if INET6
case AF_INET6:
PF_ACPY(daddr, &pd->naddr, AF_INET6);
break;
#endif
}
break;
default:
switch (af) {
#if INET
case AF_INET:
pf_change_a(&daddr->v4.s_addr,
pd->ip_sum, pd->naddr.v4.s_addr, 0);
break;
#endif
#if INET6
case AF_INET6:
PF_ACPY(daddr, &pd->naddr, af);
break;
#endif
}
break;
}
if (nr->natpass)
r = NULL;
pd->nat_rule = nr;
}
}
if (nr && nr->tag > 0)
tag = nr->tag;
while (r != NULL) {
r->evaluations++;
if (pfi_kif_match(r->kif, kif) == r->ifnot)
r = r->skip[PF_SKIP_IFP].ptr;
else if (r->direction && r->direction != direction)
r = r->skip[PF_SKIP_DIR].ptr;
else if (r->af && r->af != af)
r = r->skip[PF_SKIP_AF].ptr;
else if (r->proto && r->proto != pd->proto)
r = r->skip[PF_SKIP_PROTO].ptr;
else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
r->src.neg, kif))
r = r->skip[PF_SKIP_SRC_ADDR].ptr;
else if (r->proto == pd->proto &&
(r->proto == IPPROTO_TCP || r->proto == IPPROTO_UDP) &&
r->src.xport.range.op &&
!pf_match_port(r->src.xport.range.op,
r->src.xport.range.port[0], r->src.xport.range.port[1],
th->th_sport))
r = r->skip[PF_SKIP_SRC_PORT].ptr;
else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
r->dst.neg, NULL))
r = r->skip[PF_SKIP_DST_ADDR].ptr;
else if (r->proto == pd->proto &&
(r->proto == IPPROTO_TCP || r->proto == IPPROTO_UDP) &&
r->dst.xport.range.op &&
!pf_match_port(r->dst.xport.range.op,
r->dst.xport.range.port[0], r->dst.xport.range.port[1],
th->th_dport))
r = r->skip[PF_SKIP_DST_PORT].ptr;
else if (r->type && r->type != icmptype + 1)
r = TAILQ_NEXT(r, entries);
else if (r->code && r->code != icmpcode + 1)
r = TAILQ_NEXT(r, entries);
else if ((r->rule_flag & PFRULE_TOS) && r->tos &&
!(r->tos & pd->tos))
r = TAILQ_NEXT(r, entries);
else if ((r->rule_flag & PFRULE_DSCP) && r->tos &&
!(r->tos & (pd->tos & DSCP_MASK)))
r = TAILQ_NEXT(r, entries);
else if ((r->rule_flag & PFRULE_SC) && r->tos &&
((r->tos & SCIDX_MASK) != pd->sc))
r = TAILQ_NEXT(r, entries);
else if (r->rule_flag & PFRULE_FRAGMENT)
r = TAILQ_NEXT(r, entries);
else if (pd->proto == IPPROTO_TCP &&
(r->flagset & th->th_flags) != r->flags)
r = TAILQ_NEXT(r, entries);
else if (r->uid.op && (pd->lookup.done || (pd->lookup.done =
pf_socket_lookup(direction, pd), 1)) &&
!pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
pd->lookup.uid))
r = TAILQ_NEXT(r, entries);
else if (r->gid.op && (pd->lookup.done || (pd->lookup.done =
pf_socket_lookup(direction, pd), 1)) &&
!pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
pd->lookup.gid))
r = TAILQ_NEXT(r, entries);
else if (r->prob && r->prob <= (random() % (UINT_MAX - 1) + 1))
r = TAILQ_NEXT(r, entries);
else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag))
r = TAILQ_NEXT(r, entries);
else if (r->os_fingerprint != PF_OSFP_ANY &&
(pd->proto != IPPROTO_TCP || !pf_osfp_match(
pf_osfp_fingerprint(pd, m, off, th),
r->os_fingerprint)))
r = TAILQ_NEXT(r, entries);
else {
if (r->tag)
tag = r->tag;
if (PF_RTABLEID_IS_VALID(r->rtableid))
rtableid = r->rtableid;
if (r->anchor == NULL) {
match = 1;
*rm = r;
*am = a;
*rsm = ruleset;
if ((*rm)->quick)
break;
r = TAILQ_NEXT(r, entries);
} else
pf_step_into_anchor(&asd, &ruleset,
PF_RULESET_FILTER, &r, &a, &match);
}
if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
PF_RULESET_FILTER, &r, &a, &match))
break;
}
r = *rm;
a = *am;
ruleset = *rsm;
REASON_SET(&reason, PFRES_MATCH);
if (r->log || (nr != NULL && nr->log)) {
if (rewrite > 0) {
if (rewrite < off + hdrlen)
rewrite = off + hdrlen;
m = pf_lazy_makewritable(pd, m, rewrite);
if (!m) {
REASON_SET(&reason, PFRES_MEMORY);
return (PF_DROP);
}
m_copyback(m, off, hdrlen, pd->hdr.any);
}
PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr,
a, ruleset, pd);
}
if ((r->action == PF_DROP) &&
((r->rule_flag & PFRULE_RETURNRST) ||
(r->rule_flag & PFRULE_RETURNICMP) ||
(r->rule_flag & PFRULE_RETURN))) {
if (nr != NULL) {
if (direction == PF_OUT) {
switch (pd->proto) {
case IPPROTO_TCP:
pf_change_ap(direction, pd->mp, saddr,
&th->th_sport, pd->ip_sum,
&th->th_sum, &pd->baddr,
bxport.port, 0, af);
sxport.port = th->th_sport;
rewrite++;
break;
case IPPROTO_UDP:
pf_change_ap(direction, pd->mp, saddr,
&pd->hdr.udp->uh_sport, pd->ip_sum,
&pd->hdr.udp->uh_sum, &pd->baddr,
bxport.port, 1, af);
sxport.port = pd->hdr.udp->uh_sport;
rewrite++;
break;
case IPPROTO_ICMP:
#if INET6
case IPPROTO_ICMPV6:
#endif
break;
case IPPROTO_GRE:
PF_ACPY(&pd->baddr, saddr, af);
++rewrite;
switch (af) {
#if INET
case AF_INET:
pf_change_a(&saddr->v4.s_addr,
pd->ip_sum,
pd->baddr.v4.s_addr, 0);
break;
#endif
#if INET6
case AF_INET6:
PF_ACPY(saddr, &pd->baddr,
AF_INET6);
break;
#endif
}
break;
case IPPROTO_ESP:
PF_ACPY(&pd->baddr, saddr, af);
switch (af) {
#if INET
case AF_INET:
pf_change_a(&saddr->v4.s_addr,
pd->ip_sum,
pd->baddr.v4.s_addr, 0);
break;
#endif
#if INET6
case AF_INET6:
PF_ACPY(saddr, &pd->baddr,
AF_INET6);
break;
#endif
}
break;
default:
switch (af) {
case AF_INET:
pf_change_a(&saddr->v4.s_addr,
pd->ip_sum,
pd->baddr.v4.s_addr, 0);
break;
case AF_INET6:
PF_ACPY(saddr, &pd->baddr, af);
break;
}
}
} else {
switch (pd->proto) {
case IPPROTO_TCP:
pf_change_ap(direction, pd->mp, daddr,
&th->th_dport, pd->ip_sum,
&th->th_sum, &pd->baddr,
bxport.port, 0, af);
dxport.port = th->th_dport;
rewrite++;
break;
case IPPROTO_UDP:
pf_change_ap(direction, pd->mp, daddr,
&pd->hdr.udp->uh_dport, pd->ip_sum,
&pd->hdr.udp->uh_sum, &pd->baddr,
bxport.port, 1, af);
dxport.port = pd->hdr.udp->uh_dport;
rewrite++;
break;
case IPPROTO_ICMP:
#if INET6
case IPPROTO_ICMPV6:
#endif
break;
case IPPROTO_GRE:
if (pd->proto_variant ==
PF_GRE_PPTP_VARIANT)
grev1->call_id = bxport.call_id;
++rewrite;
switch (af) {
#if INET
case AF_INET:
pf_change_a(&daddr->v4.s_addr,
pd->ip_sum,
pd->baddr.v4.s_addr, 0);
break;
#endif
#if INET6
case AF_INET6:
PF_ACPY(daddr, &pd->baddr,
AF_INET6);
break;
#endif
}
break;
case IPPROTO_ESP:
switch (af) {
#if INET
case AF_INET:
pf_change_a(&daddr->v4.s_addr,
pd->ip_sum,
pd->baddr.v4.s_addr, 0);
break;
#endif
#if INET6
case AF_INET6:
PF_ACPY(daddr, &pd->baddr,
AF_INET6);
break;
#endif
}
break;
default:
switch (af) {
case AF_INET:
pf_change_a(&daddr->v4.s_addr,
pd->ip_sum,
pd->baddr.v4.s_addr, 0);
break;
#if INET6
case AF_INET6:
PF_ACPY(daddr, &pd->baddr, af);
break;
#endif
}
}
}
}
if (pd->proto == IPPROTO_TCP &&
((r->rule_flag & PFRULE_RETURNRST) ||
(r->rule_flag & PFRULE_RETURN)) &&
!(th->th_flags & TH_RST)) {
u_int32_t ack = ntohl(th->th_seq) + pd->p_len;
int len = 0;
struct ip *h4;
#if INET6
struct ip6_hdr *h6;
#endif
switch (af) {
case AF_INET:
h4 = mtod(m, struct ip *);
len = ntohs(h4->ip_len) - off;
break;
#if INET6
case AF_INET6:
h6 = mtod(m, struct ip6_hdr *);
len = ntohs(h6->ip6_plen) -
(off - sizeof (*h6));
break;
#endif
}
if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af))
REASON_SET(&reason, PFRES_PROTCKSUM);
else {
if (th->th_flags & TH_SYN)
ack++;
if (th->th_flags & TH_FIN)
ack++;
pf_send_tcp(r, af, pd->dst,
pd->src, th->th_dport, th->th_sport,
ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp);
}
} else if (pd->proto != IPPROTO_ICMP && af == AF_INET &&
pd->proto != IPPROTO_ESP && pd->proto != IPPROTO_AH &&
r->return_icmp)
pf_send_icmp(m, r->return_icmp >> 8,
r->return_icmp & 255, af, r);
else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 &&
pd->proto != IPPROTO_ESP && pd->proto != IPPROTO_AH &&
r->return_icmp6)
pf_send_icmp(m, r->return_icmp6 >> 8,
r->return_icmp6 & 255, af, r);
}
if (r->action == PF_DROP)
return (PF_DROP);
bzero(&psk, sizeof (psk));
psk.proto = pd->proto;
psk.direction = direction;
psk.af = af;
if (pd->proto == IPPROTO_UDP) {
if (ntohs(pd->hdr.udp->uh_sport) == PF_IKE_PORT &&
ntohs(pd->hdr.udp->uh_dport) == PF_IKE_PORT) {
psk.proto_variant = PF_EXTFILTER_APD;
} else {
psk.proto_variant = nr ? nr->extfilter : r->extfilter;
if (psk.proto_variant < PF_EXTFILTER_APD)
psk.proto_variant = PF_EXTFILTER_APD;
}
} else if (pd->proto == IPPROTO_GRE) {
psk.proto_variant = pd->proto_variant;
}
if (direction == PF_OUT) {
PF_ACPY(&psk.gwy.addr, saddr, af);
PF_ACPY(&psk.ext.addr, daddr, af);
switch (pd->proto) {
case IPPROTO_UDP:
psk.gwy.xport = sxport;
psk.ext.xport = dxport;
break;
case IPPROTO_ESP:
psk.gwy.xport.spi = 0;
psk.ext.xport.spi = pd->hdr.esp->spi;
break;
case IPPROTO_ICMP:
#if INET6
case IPPROTO_ICMPV6:
#endif
psk.gwy.xport.port = nxport.port;
psk.ext.xport.spi = 0;
break;
default:
psk.gwy.xport = sxport;
psk.ext.xport = dxport;
break;
}
if (nr != NULL) {
PF_ACPY(&psk.lan.addr, &pd->baddr, af);
psk.lan.xport = bxport;
} else {
PF_ACPY(&psk.lan.addr, &psk.gwy.addr, af);
psk.lan.xport = psk.gwy.xport;
}
} else {
PF_ACPY(&psk.lan.addr, daddr, af);
PF_ACPY(&psk.ext.addr, saddr, af);
switch (pd->proto) {
case IPPROTO_ICMP:
#if INET6
case IPPROTO_ICMPV6:
#endif
psk.lan.xport = nxport;
psk.ext.xport.spi = 0;
break;
case IPPROTO_ESP:
psk.ext.xport.spi = 0;
psk.lan.xport.spi = pd->hdr.esp->spi;
break;
default:
psk.lan.xport = dxport;
psk.ext.xport = sxport;
break;
}
if (nr != NULL) {
PF_ACPY(&psk.gwy.addr, &pd->baddr, af);
psk.gwy.xport = bxport;
} else {
PF_ACPY(&psk.gwy.addr, &psk.lan.addr, af);
psk.gwy.xport = psk.lan.xport;
}
}
if (pd->flowhash != 0) {
psk.flowhash = pd->flowhash;
} else {
psk.flowhash = pf_calc_state_key_flowhash(&psk);
pd->flowhash = psk.flowhash;
}
if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid, pd)) {
REASON_SET(&reason, PFRES_MEMORY);
return (PF_DROP);
}
if (!state_icmp && (r->keep_state || nr != NULL ||
(pd->flags & PFDESC_TCP_NORM))) {
struct pf_state *s = NULL;
struct pf_state_key *sk = NULL;
struct pf_src_node *sn = NULL;
struct pf_ike_hdr ike;
if (pd->proto == IPPROTO_UDP) {
struct udphdr *uh = pd->hdr.udp;
size_t plen = m->m_pkthdr.len - off - sizeof (*uh);
if (ntohs(uh->uh_sport) == PF_IKE_PORT &&
ntohs(uh->uh_dport) == PF_IKE_PORT &&
plen >= PF_IKE_PACKET_MINSIZE) {
if (plen > PF_IKE_PACKET_MINSIZE)
plen = PF_IKE_PACKET_MINSIZE;
m_copydata(m, off + sizeof (*uh), plen, &ike);
}
}
if (nr != NULL && pd->proto == IPPROTO_ESP &&
direction == PF_OUT) {
struct pf_state_key_cmp sk0;
struct pf_state *s0;
memset(&sk0, 0, sizeof (sk0));
sk0.af = pd->af;
sk0.proto = IPPROTO_ESP;
PF_ACPY(&sk0.gwy.addr, saddr, sk0.af);
PF_ACPY(&sk0.ext.addr, daddr, sk0.af);
s0 = pf_find_state(kif, &sk0, PF_IN);
if (s0 && PF_ANEQ(&s0->state_key->lan.addr,
pd->src, pd->af)) {
nsn = 0;
goto cleanup;
}
}
if (r->max_states && (r->states >= r->max_states)) {
pf_status.lcounters[LCNT_STATES]++;
REASON_SET(&reason, PFRES_MAXSTATES);
goto cleanup;
}
if ((r->rule_flag & PFRULE_SRCTRACK ||
r->rpool.opts & PF_POOL_STICKYADDR) &&
pf_insert_src_node(&sn, r, saddr, af) != 0) {
REASON_SET(&reason, PFRES_SRCLIMIT);
goto cleanup;
}
if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
((direction == PF_OUT &&
nr->action != PF_RDR &&
pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
(pf_insert_src_node(&nsn, nr, saddr, af) != 0))) {
REASON_SET(&reason, PFRES_SRCLIMIT);
goto cleanup;
}
s = pool_get(&pf_state_pl, PR_WAITOK);
if (s == NULL) {
REASON_SET(&reason, PFRES_MEMORY);
cleanup:
if (sn != NULL && sn->states == 0 && sn->expire == 0) {
RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
pf_status.src_nodes--;
pool_put(&pf_src_tree_pl, sn);
}
if (nsn != sn && nsn != NULL && nsn->states == 0 &&
nsn->expire == 0) {
RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
pf_status.src_nodes--;
pool_put(&pf_src_tree_pl, nsn);
}
if (sk != NULL) {
if (sk->app_state)
pool_put(&pf_app_state_pl,
sk->app_state);
pool_put(&pf_state_key_pl, sk);
}
return (PF_DROP);
}
bzero(s, sizeof (*s));
TAILQ_INIT(&s->unlink_hooks);
s->rule.ptr = r;
s->nat_rule.ptr = nr;
s->anchor.ptr = a;
STATE_INC_COUNTERS(s);
s->allow_opts = r->allow_opts;
s->log = r->log & PF_LOG_ALL;
if (nr != NULL)
s->log |= nr->log & PF_LOG_ALL;
switch (pd->proto) {
case IPPROTO_TCP:
s->src.seqlo = ntohl(th->th_seq);
s->src.seqhi = s->src.seqlo + pd->p_len + 1;
if ((th->th_flags & (TH_SYN|TH_ACK)) ==
TH_SYN && r->keep_state == PF_STATE_MODULATE) {
if ((s->src.seqdiff = pf_tcp_iss(pd) -
s->src.seqlo) == 0)
s->src.seqdiff = 1;
pf_change_a(&th->th_seq, &th->th_sum,
htonl(s->src.seqlo + s->src.seqdiff), 0);
rewrite = off + sizeof (*th);
} else
s->src.seqdiff = 0;
if (th->th_flags & TH_SYN) {
s->src.seqhi++;
s->src.wscale = pf_get_wscale(m, off,
th->th_off, af);
}
s->src.max_win = MAX(ntohs(th->th_win), 1);
if (s->src.wscale & PF_WSCALE_MASK) {
int win = s->src.max_win;
win += 1 << (s->src.wscale & PF_WSCALE_MASK);
s->src.max_win = (win - 1) >>
(s->src.wscale & PF_WSCALE_MASK);
}
if (th->th_flags & TH_FIN)
s->src.seqhi++;
s->dst.seqhi = 1;
s->dst.max_win = 1;
s->src.state = TCPS_SYN_SENT;
s->dst.state = TCPS_CLOSED;
s->timeout = PFTM_TCP_FIRST_PACKET;
break;
case IPPROTO_UDP:
s->src.state = PFUDPS_SINGLE;
s->dst.state = PFUDPS_NO_TRAFFIC;
s->timeout = PFTM_UDP_FIRST_PACKET;
break;
case IPPROTO_ICMP:
#if INET6
case IPPROTO_ICMPV6:
#endif
s->timeout = PFTM_ICMP_FIRST_PACKET;
break;
case IPPROTO_GRE:
s->src.state = PFGRE1S_INITIATING;
s->dst.state = PFGRE1S_NO_TRAFFIC;
s->timeout = PFTM_GREv1_INITIATING;
break;
case IPPROTO_ESP:
s->src.state = PFESPS_INITIATING;
s->dst.state = PFESPS_NO_TRAFFIC;
s->timeout = PFTM_ESP_FIRST_PACKET;
break;
default:
s->src.state = PFOTHERS_SINGLE;
s->dst.state = PFOTHERS_NO_TRAFFIC;
s->timeout = PFTM_OTHER_FIRST_PACKET;
}
s->creation = pf_time_second();
s->expire = pf_time_second();
if (sn != NULL) {
s->src_node = sn;
s->src_node->states++;
VERIFY(s->src_node->states != 0);
}
if (nsn != NULL) {
PF_ACPY(&nsn->raddr, &pd->naddr, af);
s->nat_src_node = nsn;
s->nat_src_node->states++;
VERIFY(s->nat_src_node->states != 0);
}
if (pd->proto == IPPROTO_TCP) {
if ((pd->flags & PFDESC_TCP_NORM) &&
pf_normalize_tcp_init(m, off, pd, th, &s->src,
&s->dst)) {
REASON_SET(&reason, PFRES_MEMORY);
pf_src_tree_remove_state(s);
STATE_DEC_COUNTERS(s);
pool_put(&pf_state_pl, s);
return (PF_DROP);
}
if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
pf_normalize_tcp_stateful(m, off, pd, &reason,
th, s, &s->src, &s->dst, &rewrite)) {
DPFPRINTF(PF_DEBUG_URGENT,
("pf_normalize_tcp_stateful failed on "
"first pkt"));
pf_normalize_tcp_cleanup(s);
pf_src_tree_remove_state(s);
STATE_DEC_COUNTERS(s);
pool_put(&pf_state_pl, s);
return (PF_DROP);
}
}
if ((sk = pf_alloc_state_key(s, &psk)) == NULL) {
REASON_SET(&reason, PFRES_MEMORY);
goto cleanup;
}
pf_set_rt_ifp(s, saddr);
m = pd->mp;
if (sk->app_state == 0) {
switch (pd->proto) {
case IPPROTO_TCP: {
u_int16_t dport = (direction == PF_OUT) ?
sk->ext.xport.port : sk->gwy.xport.port;
if (nr != NULL &&
ntohs(dport) == PF_PPTP_PORT) {
struct pf_app_state *as;
as = pool_get(&pf_app_state_pl,
PR_WAITOK);
if (!as) {
REASON_SET(&reason,
PFRES_MEMORY);
goto cleanup;
}
bzero(as, sizeof (*as));
as->handler = pf_pptp_handler;
as->compare_lan_ext = 0;
as->compare_ext_gwy = 0;
as->u.pptp.grev1_state = 0;
sk->app_state = as;
(void) hook_establish(&s->unlink_hooks,
0, (hook_fn_t) pf_pptp_unlink, s);
}
break;
}
case IPPROTO_UDP: {
struct udphdr *uh = pd->hdr.udp;
if (nr != NULL &&
ntohs(uh->uh_sport) == PF_IKE_PORT &&
ntohs(uh->uh_dport) == PF_IKE_PORT) {
struct pf_app_state *as;
as = pool_get(&pf_app_state_pl,
PR_WAITOK);
if (!as) {
REASON_SET(&reason,
PFRES_MEMORY);
goto cleanup;
}
bzero(as, sizeof (*as));
as->compare_lan_ext = pf_ike_compare;
as->compare_ext_gwy = pf_ike_compare;
as->u.ike.cookie = ike.initiator_cookie;
sk->app_state = as;
}
break;
}
default:
break;
}
}
if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
if (pd->proto == IPPROTO_TCP)
pf_normalize_tcp_cleanup(s);
REASON_SET(&reason, PFRES_STATEINS);
pf_src_tree_remove_state(s);
STATE_DEC_COUNTERS(s);
pool_put(&pf_state_pl, s);
return (PF_DROP);
} else
*sm = s;
if (tag > 0) {
pf_tag_ref(tag);
s->tag = tag;
}
if (pd->proto == IPPROTO_TCP &&
(th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
r->keep_state == PF_STATE_SYNPROXY) {
s->src.state = PF_TCPS_PROXY_SRC;
if (nr != NULL) {
if (direction == PF_OUT) {
pf_change_ap(direction, pd->mp, saddr,
&th->th_sport, pd->ip_sum,
&th->th_sum, &pd->baddr,
bxport.port, 0, af);
sxport.port = th->th_sport;
} else {
pf_change_ap(direction, pd->mp, daddr,
&th->th_dport, pd->ip_sum,
&th->th_sum, &pd->baddr,
bxport.port, 0, af);
sxport.port = th->th_dport;
}
}
s->src.seqhi = htonl(random());
mss = pf_get_mss(m, off, th->th_off, af);
mss = pf_calc_mss(saddr, af, mss);
mss = pf_calc_mss(daddr, af, mss);
s->src.mss = mss;
pf_send_tcp(r, af, daddr, saddr, th->th_dport,
th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL);
REASON_SET(&reason, PFRES_SYNPROXY);
return (PF_SYNPROXY_DROP);
}
if (sk->app_state && sk->app_state->handler) {
int offx = off;
switch (pd->proto) {
case IPPROTO_TCP:
offx += th->th_off << 2;
break;
case IPPROTO_UDP:
offx += pd->hdr.udp->uh_ulen << 2;
break;
default:
break;
}
if (offx > off) {
sk->app_state->handler(s, direction, offx,
pd, kif);
if (pd->lmw < 0) {
REASON_SET(&reason, PFRES_MEMORY);
return (PF_DROP);
}
m = pd->mp;
}
}
}
if (rewrite) {
if (rewrite < off + hdrlen)
rewrite = off + hdrlen;
m = pf_lazy_makewritable(pd, pd->mp, rewrite);
if (!m) {
REASON_SET(&reason, PFRES_MEMORY);
return (PF_DROP);
}
m_copyback(m, off, hdrlen, pd->hdr.any);
}
return (PF_PASS);
}
#if DUMMYNET
static int
pf_test_dummynet(struct pf_rule **rm, int direction, struct pfi_kif *kif,
struct mbuf **m0, struct pf_pdesc *pd, struct ip_fw_args *fwa)
{
struct mbuf *m = *m0;
struct pf_rule *am = NULL;
struct pf_ruleset *rsm = NULL;
struct pf_addr *saddr = pd->src, *daddr = pd->dst;
sa_family_t af = pd->af;
struct pf_rule *r, *a = NULL;
struct pf_ruleset *ruleset = NULL;
struct tcphdr *th = pd->hdr.tcp;
u_short reason;
int hdrlen = 0;
int tag = -1;
unsigned int rtableid = IFSCOPE_NONE;
int asd = 0;
int match = 0;
u_int8_t icmptype = 0, icmpcode = 0;
union pf_state_xport nxport, sxport, dxport;
struct ip_fw_args dnflow;
struct pf_rule *prev_matching_rule = fwa ? fwa->fwa_pf_rule : NULL;
int found_prev_rule = (prev_matching_rule) ? 0 : 1;
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
if (!DUMMYNET_LOADED)
return (PF_PASS);
if (TAILQ_EMPTY(pf_main_ruleset.rules[PF_RULESET_DUMMYNET].active.ptr)) {
return (PF_PASS);
}
bzero(&dnflow, sizeof(dnflow));
hdrlen = 0;
sxport.spi = 0;
dxport.spi = 0;
nxport.spi = 0;
if (!(pd->flags & PFDESC_IP_FRAG))
switch (pd->proto) {
case IPPROTO_TCP:
dnflow.fwa_id.flags = pd->hdr.tcp->th_flags;
dnflow.fwa_id.dst_port = pd->hdr.tcp->th_dport;
dnflow.fwa_id.src_port = pd->hdr.tcp->th_sport;
sxport.port = pd->hdr.tcp->th_sport;
dxport.port = pd->hdr.tcp->th_dport;
hdrlen = sizeof (*th);
break;
case IPPROTO_UDP:
dnflow.fwa_id.dst_port = pd->hdr.udp->uh_dport;
dnflow.fwa_id.src_port = pd->hdr.udp->uh_sport;
sxport.port = pd->hdr.udp->uh_sport;
dxport.port = pd->hdr.udp->uh_dport;
hdrlen = sizeof (*pd->hdr.udp);
break;
#if INET
case IPPROTO_ICMP:
if (pd->af != AF_INET)
break;
sxport.port = dxport.port = pd->hdr.icmp->icmp_id;
hdrlen = ICMP_MINLEN;
icmptype = pd->hdr.icmp->icmp_type;
icmpcode = pd->hdr.icmp->icmp_code;
break;
#endif
#if INET6
case IPPROTO_ICMPV6:
if (pd->af != AF_INET6)
break;
sxport.port = dxport.port = pd->hdr.icmp6->icmp6_id;
hdrlen = sizeof (*pd->hdr.icmp6);
icmptype = pd->hdr.icmp6->icmp6_type;
icmpcode = pd->hdr.icmp6->icmp6_code;
break;
#endif
case IPPROTO_GRE:
if (pd->proto_variant == PF_GRE_PPTP_VARIANT) {
sxport.call_id = dxport.call_id =
pd->hdr.grev1->call_id;
hdrlen = sizeof (*pd->hdr.grev1);
}
break;
case IPPROTO_ESP:
sxport.spi = 0;
dxport.spi = pd->hdr.esp->spi;
hdrlen = sizeof (*pd->hdr.esp);
break;
}
r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_DUMMYNET].active.ptr);
while (r != NULL) {
r->evaluations++;
if (pfi_kif_match(r->kif, kif) == r->ifnot)
r = r->skip[PF_SKIP_IFP].ptr;
else if (r->direction && r->direction != direction)
r = r->skip[PF_SKIP_DIR].ptr;
else if (r->af && r->af != af)
r = r->skip[PF_SKIP_AF].ptr;
else if (r->proto && r->proto != pd->proto)
r = r->skip[PF_SKIP_PROTO].ptr;
else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
r->src.neg, kif))
r = r->skip[PF_SKIP_SRC_ADDR].ptr;
else if (r->proto == pd->proto &&
(r->proto == IPPROTO_TCP || r->proto == IPPROTO_UDP) &&
((pd->flags & PFDESC_IP_FRAG) ||
((r->src.xport.range.op &&
!pf_match_port(r->src.xport.range.op,
r->src.xport.range.port[0], r->src.xport.range.port[1],
th->th_sport)))))
r = r->skip[PF_SKIP_SRC_PORT].ptr;
else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
r->dst.neg, NULL))
r = r->skip[PF_SKIP_DST_ADDR].ptr;
else if (r->proto == pd->proto &&
(r->proto == IPPROTO_TCP || r->proto == IPPROTO_UDP) &&
r->dst.xport.range.op &&
((pd->flags & PFDESC_IP_FRAG) ||
!pf_match_port(r->dst.xport.range.op,
r->dst.xport.range.port[0], r->dst.xport.range.port[1],
th->th_dport)))
r = r->skip[PF_SKIP_DST_PORT].ptr;
else if (r->type &&
((pd->flags & PFDESC_IP_FRAG) ||
r->type != icmptype + 1))
r = TAILQ_NEXT(r, entries);
else if (r->code &&
((pd->flags & PFDESC_IP_FRAG) ||
r->code != icmpcode + 1))
r = TAILQ_NEXT(r, entries);
else if (r->tos && !(r->tos == pd->tos))
r = TAILQ_NEXT(r, entries);
else if (r->rule_flag & PFRULE_FRAGMENT)
r = TAILQ_NEXT(r, entries);
else if (pd->proto == IPPROTO_TCP &&
((pd->flags & PFDESC_IP_FRAG) ||
(r->flagset & th->th_flags) != r->flags))
r = TAILQ_NEXT(r, entries);
else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag))
r = TAILQ_NEXT(r, entries);
else {
if (r->anchor == NULL) {
if (found_prev_rule) {
if (r->tag)
tag = r->tag;
if (PF_RTABLEID_IS_VALID(r->rtableid))
rtableid = r->rtableid;
match = 1;
*rm = r;
am = a;
rsm = ruleset;
if ((*rm)->quick)
break;
} else if (r == prev_matching_rule) {
found_prev_rule = 1;
}
r = TAILQ_NEXT(r, entries);
} else {
pf_step_into_anchor(&asd, &ruleset,
PF_RULESET_DUMMYNET, &r, &a, &match);
}
}
if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
PF_RULESET_DUMMYNET, &r, &a, &match))
break;
}
r = *rm;
a = am;
ruleset = rsm;
if (!match)
return (PF_PASS);
REASON_SET(&reason, PFRES_DUMMYNET);
if (r->log) {
PFLOG_PACKET(kif, h, m, af, direction, reason, r,
a, ruleset, pd);
}
if (r->action == PF_NODUMMYNET) {
int dirndx = (direction == PF_OUT);
r->packets[dirndx]++;
r->bytes[dirndx] += pd->tot_len;
return (PF_PASS);
}
if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid, pd)) {
REASON_SET(&reason, PFRES_MEMORY);
return (PF_DROP);
}
if (r->dnpipe && ip_dn_io_ptr != NULL) {
int dirndx = (direction == PF_OUT);
r->packets[dirndx]++;
r->bytes[dirndx] += pd->tot_len;
dnflow.fwa_cookie = r->dnpipe;
dnflow.fwa_pf_rule = r;
dnflow.fwa_id.addr_type = (af == AF_INET) ? 4 : 6;
dnflow.fwa_id.proto = pd->proto;
dnflow.fwa_flags = r->dntype;
if (fwa != NULL) {
dnflow.fwa_oif = fwa->fwa_oif;
dnflow.fwa_oflags = fwa->fwa_oflags;
dnflow.fwa_ro = fwa->fwa_ro;
dnflow.fwa_dst = fwa->fwa_dst;
dnflow.fwa_ipoa = fwa->fwa_ipoa;
dnflow.fwa_ro6_pmtu = fwa->fwa_ro6_pmtu;
dnflow.fwa_origifp = fwa->fwa_origifp;
dnflow.fwa_mtu = fwa->fwa_mtu;
dnflow.fwa_alwaysfrag = fwa->fwa_alwaysfrag;
dnflow.fwa_unfragpartlen = fwa->fwa_unfragpartlen;
dnflow.fwa_exthdrs = fwa->fwa_exthdrs;
}
if (af == AF_INET) {
struct ip *iphdr = mtod(m, struct ip *);
NTOHS(iphdr->ip_len);
NTOHS(iphdr->ip_off);
}
ip_dn_io_ptr(m,
dnflow.fwa_cookie,
af == AF_INET ?
direction == PF_IN ? DN_TO_IP_IN : DN_TO_IP_OUT :
direction == PF_IN ? DN_TO_IP6_IN : DN_TO_IP6_OUT,
&dnflow, DN_CLIENT_PF);
*m0 = NULL;
return (PF_PASS);
}
return (PF_PASS);
}
#endif
static int
pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
struct pf_ruleset **rsm)
{
#pragma unused(h)
struct pf_rule *r, *a = NULL;
struct pf_ruleset *ruleset = NULL;
sa_family_t af = pd->af;
u_short reason;
int tag = -1;
int asd = 0;
int match = 0;
r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
while (r != NULL) {
r->evaluations++;
if (pfi_kif_match(r->kif, kif) == r->ifnot)
r = r->skip[PF_SKIP_IFP].ptr;
else if (r->direction && r->direction != direction)
r = r->skip[PF_SKIP_DIR].ptr;
else if (r->af && r->af != af)
r = r->skip[PF_SKIP_AF].ptr;
else if (r->proto && r->proto != pd->proto)
r = r->skip[PF_SKIP_PROTO].ptr;
else if (PF_MISMATCHAW(&r->src.addr, pd->src, af,
r->src.neg, kif))
r = r->skip[PF_SKIP_SRC_ADDR].ptr;
else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af,
r->dst.neg, NULL))
r = r->skip[PF_SKIP_DST_ADDR].ptr;
else if ((r->rule_flag & PFRULE_TOS) && r->tos &&
!(r->tos & pd->tos))
r = TAILQ_NEXT(r, entries);
else if ((r->rule_flag & PFRULE_DSCP) && r->tos &&
!(r->tos & (pd->tos & DSCP_MASK)))
r = TAILQ_NEXT(r, entries);
else if ((r->rule_flag & PFRULE_SC) && r->tos &&
((r->tos & SCIDX_MASK) != pd->sc))
r = TAILQ_NEXT(r, entries);
else if (r->os_fingerprint != PF_OSFP_ANY)
r = TAILQ_NEXT(r, entries);
else if (pd->proto == IPPROTO_UDP &&
(r->src.xport.range.op || r->dst.xport.range.op))
r = TAILQ_NEXT(r, entries);
else if (pd->proto == IPPROTO_TCP &&
(r->src.xport.range.op || r->dst.xport.range.op ||
r->flagset))
r = TAILQ_NEXT(r, entries);
else if ((pd->proto == IPPROTO_ICMP ||
pd->proto == IPPROTO_ICMPV6) &&
(r->type || r->code))
r = TAILQ_NEXT(r, entries);
else if (r->prob && r->prob <= (random() % (UINT_MAX - 1) + 1))
r = TAILQ_NEXT(r, entries);
else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag))
r = TAILQ_NEXT(r, entries);
else {
if (r->anchor == NULL) {
match = 1;
*rm = r;
*am = a;
*rsm = ruleset;
if ((*rm)->quick)
break;
r = TAILQ_NEXT(r, entries);
} else
pf_step_into_anchor(&asd, &ruleset,
PF_RULESET_FILTER, &r, &a, &match);
}
if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
PF_RULESET_FILTER, &r, &a, &match))
break;
}
r = *rm;
a = *am;
ruleset = *rsm;
REASON_SET(&reason, PFRES_MATCH);
if (r->log)
PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset,
pd);
if (r->action != PF_PASS)
return (PF_DROP);
if (pf_tag_packet(m, pd->pf_mtag, tag, -1, NULL)) {
REASON_SET(&reason, PFRES_MEMORY);
return (PF_DROP);
}
return (PF_PASS);
}
static void
pf_pptp_handler(struct pf_state *s, int direction, int off,
struct pf_pdesc *pd, struct pfi_kif *kif)
{
#pragma unused(direction)
struct tcphdr *th;
struct pf_pptp_state *pptps;
struct pf_pptp_ctrl_msg cm;
size_t plen;
struct pf_state *gs;
u_int16_t ct;
u_int16_t *pac_call_id;
u_int16_t *pns_call_id;
u_int16_t *spoof_call_id;
u_int8_t *pac_state;
u_int8_t *pns_state;
enum { PF_PPTP_PASS, PF_PPTP_INSERT_GRE, PF_PPTP_REMOVE_GRE } op;
struct mbuf *m;
struct pf_state_key *sk;
struct pf_state_key *gsk;
struct pf_app_state *gas;
sk = s->state_key;
pptps = &sk->app_state->u.pptp;
gs = pptps->grev1_state;
if (gs)
gs->expire = pf_time_second();
m = pd->mp;
plen = min(sizeof (cm), m->m_pkthdr.len - off);
if (plen < PF_PPTP_CTRL_MSG_MINSIZE)
return;
m_copydata(m, off, plen, &cm);
if (ntohl(cm.hdr.magic) != PF_PPTP_MAGIC_NUMBER)
return;
if (ntohs(cm.hdr.type) != 1)
return;
if (!gs) {
gs = pool_get(&pf_state_pl, PR_WAITOK);
if (!gs)
return;
memcpy(gs, s, sizeof (*gs));
memset(&gs->entry_id, 0, sizeof (gs->entry_id));
memset(&gs->entry_list, 0, sizeof (gs->entry_list));
TAILQ_INIT(&gs->unlink_hooks);
gs->rt_kif = NULL;
gs->creation = 0;
gs->pfsync_time = 0;
gs->packets[0] = gs->packets[1] = 0;
gs->bytes[0] = gs->bytes[1] = 0;
gs->timeout = PFTM_UNLINKED;
gs->id = gs->creatorid = 0;
gs->src.state = gs->dst.state = PFGRE1S_NO_TRAFFIC;
gs->src.scrub = gs->dst.scrub = 0;
gas = pool_get(&pf_app_state_pl, PR_NOWAIT);
if (!gas) {
pool_put(&pf_state_pl, gs);
return;
}
gsk = pf_alloc_state_key(gs, NULL);
if (!gsk) {
pool_put(&pf_app_state_pl, gas);
pool_put(&pf_state_pl, gs);
return;
}
memcpy(&gsk->lan, &sk->lan, sizeof (gsk->lan));
memcpy(&gsk->gwy, &sk->gwy, sizeof (gsk->gwy));
memcpy(&gsk->ext, &sk->ext, sizeof (gsk->ext));
gsk->af = sk->af;
gsk->proto = IPPROTO_GRE;
gsk->proto_variant = PF_GRE_PPTP_VARIANT;
gsk->app_state = gas;
gsk->lan.xport.call_id = 0;
gsk->gwy.xport.call_id = 0;
gsk->ext.xport.call_id = 0;
gsk->flowhash = pf_calc_state_key_flowhash(gsk);
memset(gas, 0, sizeof (*gas));
gas->u.grev1.pptp_state = s;
STATE_INC_COUNTERS(gs);
pptps->grev1_state = gs;
(void) hook_establish(&gs->unlink_hooks, 0,
(hook_fn_t) pf_grev1_unlink, gs);
} else {
gsk = gs->state_key;
}
switch (sk->direction) {
case PF_IN:
pns_call_id = &gsk->ext.xport.call_id;
pns_state = &gs->dst.state;
pac_call_id = &gsk->lan.xport.call_id;
pac_state = &gs->src.state;
break;
case PF_OUT:
pns_call_id = &gsk->lan.xport.call_id;
pns_state = &gs->src.state;
pac_call_id = &gsk->ext.xport.call_id;
pac_state = &gs->dst.state;
break;
default:
DPFPRINTF(PF_DEBUG_URGENT,
("pf_pptp_handler: bad directional!\n"));
return;
}
spoof_call_id = 0;
op = PF_PPTP_PASS;
ct = ntohs(cm.ctrl.type);
switch (ct) {
case PF_PPTP_CTRL_TYPE_CALL_OUT_REQ:
*pns_call_id = cm.msg.call_out_req.call_id;
*pns_state = PFGRE1S_INITIATING;
if (s->nat_rule.ptr && pns_call_id == &gsk->lan.xport.call_id)
spoof_call_id = &cm.msg.call_out_req.call_id;
break;
case PF_PPTP_CTRL_TYPE_CALL_OUT_RPY:
*pac_call_id = cm.msg.call_out_rpy.call_id;
if (s->nat_rule.ptr)
spoof_call_id =
(pac_call_id == &gsk->lan.xport.call_id) ?
&cm.msg.call_out_rpy.call_id :
&cm.msg.call_out_rpy.peer_call_id;
if (gs->timeout == PFTM_UNLINKED) {
*pac_state = PFGRE1S_INITIATING;
op = PF_PPTP_INSERT_GRE;
}
break;
case PF_PPTP_CTRL_TYPE_CALL_IN_1ST:
*pns_call_id = cm.msg.call_in_1st.call_id;
*pns_state = PFGRE1S_INITIATING;
if (s->nat_rule.ptr && pns_call_id == &gsk->lan.xport.call_id)
spoof_call_id = &cm.msg.call_in_1st.call_id;
break;
case PF_PPTP_CTRL_TYPE_CALL_IN_2ND:
*pac_call_id = cm.msg.call_in_2nd.call_id;
*pac_state = PFGRE1S_INITIATING;
if (s->nat_rule.ptr)
spoof_call_id =
(pac_call_id == &gsk->lan.xport.call_id) ?
&cm.msg.call_in_2nd.call_id :
&cm.msg.call_in_2nd.peer_call_id;
break;
case PF_PPTP_CTRL_TYPE_CALL_IN_3RD:
if (s->nat_rule.ptr && pns_call_id == &gsk->lan.xport.call_id)
spoof_call_id = &cm.msg.call_in_3rd.call_id;
if (cm.msg.call_in_3rd.call_id != *pns_call_id) {
break;
}
if (gs->timeout == PFTM_UNLINKED)
op = PF_PPTP_INSERT_GRE;
break;
case PF_PPTP_CTRL_TYPE_CALL_CLR:
if (cm.msg.call_clr.call_id != *pns_call_id)
op = PF_PPTP_REMOVE_GRE;
break;
case PF_PPTP_CTRL_TYPE_CALL_DISC:
if (cm.msg.call_clr.call_id != *pac_call_id)
op = PF_PPTP_REMOVE_GRE;
break;
case PF_PPTP_CTRL_TYPE_ERROR:
if (s->nat_rule.ptr && pns_call_id == &gsk->lan.xport.call_id)
spoof_call_id = &cm.msg.error.peer_call_id;
break;
case PF_PPTP_CTRL_TYPE_SET_LINKINFO:
if (s->nat_rule.ptr && pac_call_id == &gsk->lan.xport.call_id)
spoof_call_id = &cm.msg.set_linkinfo.peer_call_id;
break;
default:
op = PF_PPTP_PASS;
break;
}
if (!gsk->gwy.xport.call_id && gsk->lan.xport.call_id) {
gsk->gwy.xport.call_id = gsk->lan.xport.call_id;
if (spoof_call_id) {
u_int16_t call_id = 0;
int n = 0;
struct pf_state_key_cmp key;
key.af = gsk->af;
key.proto = IPPROTO_GRE;
key.proto_variant = PF_GRE_PPTP_VARIANT;
PF_ACPY(&key.gwy.addr, &gsk->gwy.addr, key.af);
PF_ACPY(&key.ext.addr, &gsk->ext.addr, key.af);
key.gwy.xport.call_id = gsk->gwy.xport.call_id;
key.ext.xport.call_id = gsk->ext.xport.call_id;
do {
call_id = htonl(random());
} while (!call_id);
while (pf_find_state_all(&key, PF_IN, 0)) {
call_id = ntohs(call_id);
--call_id;
if (--call_id == 0) call_id = 0xffff;
call_id = htons(call_id);
key.gwy.xport.call_id = call_id;
if (++n > 65535) {
DPFPRINTF(PF_DEBUG_URGENT,
("pf_pptp_handler: failed to spoof "
"call id\n"));
key.gwy.xport.call_id = 0;
break;
}
}
gsk->gwy.xport.call_id = call_id;
}
}
th = pd->hdr.tcp;
if (spoof_call_id && gsk->lan.xport.call_id != gsk->gwy.xport.call_id) {
if (*spoof_call_id == gsk->gwy.xport.call_id) {
*spoof_call_id = gsk->lan.xport.call_id;
th->th_sum = pf_cksum_fixup(th->th_sum,
gsk->gwy.xport.call_id, gsk->lan.xport.call_id, 0);
} else {
*spoof_call_id = gsk->gwy.xport.call_id;
th->th_sum = pf_cksum_fixup(th->th_sum,
gsk->lan.xport.call_id, gsk->gwy.xport.call_id, 0);
}
m = pf_lazy_makewritable(pd, m, off + plen);
if (!m) {
pptps->grev1_state = NULL;
STATE_DEC_COUNTERS(gs);
pool_put(&pf_state_pl, gs);
return;
}
m_copyback(m, off, plen, &cm);
}
switch (op) {
case PF_PPTP_REMOVE_GRE:
gs->timeout = PFTM_PURGE;
gs->src.state = gs->dst.state = PFGRE1S_NO_TRAFFIC;
gsk->lan.xport.call_id = 0;
gsk->gwy.xport.call_id = 0;
gsk->ext.xport.call_id = 0;
gs->id = gs->creatorid = 0;
break;
case PF_PPTP_INSERT_GRE:
gs->creation = pf_time_second();
gs->expire = pf_time_second();
gs->timeout = PFTM_TCP_ESTABLISHED;
if (gs->src_node != NULL) {
++gs->src_node->states;
VERIFY(gs->src_node->states != 0);
}
if (gs->nat_src_node != NULL) {
++gs->nat_src_node->states;
VERIFY(gs->nat_src_node->states != 0);
}
pf_set_rt_ifp(gs, &sk->lan.addr);
if (pf_insert_state(BOUND_IFACE(s->rule.ptr, kif), gs)) {
pptps->grev1_state = NULL;
pd->lmw = -1;
pf_src_tree_remove_state(gs);
STATE_DEC_COUNTERS(gs);
pool_put(&pf_state_pl, gs);
DPFPRINTF(PF_DEBUG_URGENT, ("pf_pptp_handler: error "
"inserting GREv1 state.\n"));
}
break;
default:
break;
}
}
static void
pf_pptp_unlink(struct pf_state *s)
{
struct pf_app_state *as = s->state_key->app_state;
struct pf_state *grev1s = as->u.pptp.grev1_state;
if (grev1s) {
struct pf_app_state *gas = grev1s->state_key->app_state;
if (grev1s->timeout < PFTM_MAX)
grev1s->timeout = PFTM_PURGE;
gas->u.grev1.pptp_state = NULL;
as->u.pptp.grev1_state = NULL;
}
}
static void
pf_grev1_unlink(struct pf_state *s)
{
struct pf_app_state *as = s->state_key->app_state;
struct pf_state *pptps = as->u.grev1.pptp_state;
if (pptps) {
struct pf_app_state *pas = pptps->state_key->app_state;
pas->u.pptp.grev1_state = NULL;
as->u.grev1.pptp_state = NULL;
}
}
static int
pf_ike_compare(struct pf_app_state *a, struct pf_app_state *b)
{
int64_t d = a->u.ike.cookie - b->u.ike.cookie;
return ((d > 0) ? 1 : ((d < 0) ? -1 : 0));
}
static int
pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
u_short *reason)
{
#pragma unused(h)
struct pf_state_key_cmp key;
struct tcphdr *th = pd->hdr.tcp;
u_int16_t win = ntohs(th->th_win);
u_int32_t ack, end, seq, orig_seq;
u_int8_t sws, dws;
int ackskew;
int copyback = 0;
struct pf_state_peer *src, *dst;
key.app_state = 0;
key.af = pd->af;
key.proto = IPPROTO_TCP;
if (direction == PF_IN) {
PF_ACPY(&key.ext.addr, pd->src, key.af);
PF_ACPY(&key.gwy.addr, pd->dst, key.af);
key.ext.xport.port = th->th_sport;
key.gwy.xport.port = th->th_dport;
} else {
PF_ACPY(&key.lan.addr, pd->src, key.af);
PF_ACPY(&key.ext.addr, pd->dst, key.af);
key.lan.xport.port = th->th_sport;
key.ext.xport.port = th->th_dport;
}
STATE_LOOKUP();
if (direction == (*state)->state_key->direction) {
src = &(*state)->src;
dst = &(*state)->dst;
} else {
src = &(*state)->dst;
dst = &(*state)->src;
}
if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
if (direction != (*state)->state_key->direction) {
REASON_SET(reason, PFRES_SYNPROXY);
return (PF_SYNPROXY_DROP);
}
if (th->th_flags & TH_SYN) {
if (ntohl(th->th_seq) != (*state)->src.seqlo) {
REASON_SET(reason, PFRES_SYNPROXY);
return (PF_DROP);
}
pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
pd->src, th->th_dport, th->th_sport,
(*state)->src.seqhi, ntohl(th->th_seq) + 1,
TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1,
0, NULL, NULL);
REASON_SET(reason, PFRES_SYNPROXY);
return (PF_SYNPROXY_DROP);
} else if (!(th->th_flags & TH_ACK) ||
(ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
(ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
REASON_SET(reason, PFRES_SYNPROXY);
return (PF_DROP);
} else if ((*state)->src_node != NULL &&
pf_src_connlimit(state)) {
REASON_SET(reason, PFRES_SRCLIMIT);
return (PF_DROP);
} else
(*state)->src.state = PF_TCPS_PROXY_DST;
}
if ((*state)->src.state == PF_TCPS_PROXY_DST) {
struct pf_state_host *psrc, *pdst;
if (direction == PF_OUT) {
psrc = &(*state)->state_key->gwy;
pdst = &(*state)->state_key->ext;
} else {
psrc = &(*state)->state_key->ext;
pdst = &(*state)->state_key->lan;
}
if (direction == (*state)->state_key->direction) {
if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
(ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
(ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
REASON_SET(reason, PFRES_SYNPROXY);
return (PF_DROP);
}
(*state)->src.max_win = MAX(ntohs(th->th_win), 1);
if ((*state)->dst.seqhi == 1)
(*state)->dst.seqhi = htonl(random());
pf_send_tcp((*state)->rule.ptr, pd->af, &psrc->addr,
&pdst->addr, psrc->xport.port, pdst->xport.port,
(*state)->dst.seqhi, 0, TH_SYN, 0,
(*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL);
REASON_SET(reason, PFRES_SYNPROXY);
return (PF_SYNPROXY_DROP);
} else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
(TH_SYN|TH_ACK)) ||
(ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) {
REASON_SET(reason, PFRES_SYNPROXY);
return (PF_DROP);
} else {
(*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
(*state)->dst.seqlo = ntohl(th->th_seq);
pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
pd->src, th->th_dport, th->th_sport,
ntohl(th->th_ack), ntohl(th->th_seq) + 1,
TH_ACK, (*state)->src.max_win, 0, 0, 0,
(*state)->tag, NULL, NULL);
pf_send_tcp((*state)->rule.ptr, pd->af, &psrc->addr,
&pdst->addr, psrc->xport.port, pdst->xport.port,
(*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
TH_ACK, (*state)->dst.max_win, 0, 0, 1,
0, NULL, NULL);
(*state)->src.seqdiff = (*state)->dst.seqhi -
(*state)->src.seqlo;
(*state)->dst.seqdiff = (*state)->src.seqhi -
(*state)->dst.seqlo;
(*state)->src.seqhi = (*state)->src.seqlo +
(*state)->dst.max_win;
(*state)->dst.seqhi = (*state)->dst.seqlo +
(*state)->src.max_win;
(*state)->src.wscale = (*state)->dst.wscale = 0;
(*state)->src.state = (*state)->dst.state =
TCPS_ESTABLISHED;
REASON_SET(reason, PFRES_SYNPROXY);
return (PF_SYNPROXY_DROP);
}
}
if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) &&
dst->state >= TCPS_FIN_WAIT_2 &&
src->state >= TCPS_FIN_WAIT_2) {
if (pf_status.debug >= PF_DEBUG_MISC) {
printf("pf: state reuse ");
pf_print_state(*state);
pf_print_flags(th->th_flags);
printf("\n");
}
(*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
pf_unlink_state(*state);
*state = NULL;
return (PF_DROP);
}
if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
sws = src->wscale & PF_WSCALE_MASK;
dws = dst->wscale & PF_WSCALE_MASK;
} else
sws = dws = 0;
orig_seq = seq = ntohl(th->th_seq);
if (src->seqlo == 0) {
if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
src->scrub == NULL) {
if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
REASON_SET(reason, PFRES_MEMORY);
return (PF_DROP);
}
}
if (dst->seqdiff && !src->seqdiff) {
while ((src->seqdiff = random() - seq) == 0)
;
ack = ntohl(th->th_ack) - dst->seqdiff;
pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
src->seqdiff), 0);
pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
copyback = off + sizeof (*th);
} else {
ack = ntohl(th->th_ack);
}
end = seq + pd->p_len;
if (th->th_flags & TH_SYN) {
end++;
if (dst->wscale & PF_WSCALE_FLAG) {
src->wscale = pf_get_wscale(m, off, th->th_off,
pd->af);
if (src->wscale & PF_WSCALE_FLAG) {
sws = src->wscale & PF_WSCALE_MASK;
win = ((u_int32_t)win + (1 << sws) - 1)
>> sws;
dws = dst->wscale & PF_WSCALE_MASK;
} else {
u_int32_t max_win = dst->max_win;
max_win <<=
dst->wscale & PF_WSCALE_MASK;
dst->max_win = MIN(0xffff, max_win);
dst->wscale = 0;
}
}
}
if (th->th_flags & TH_FIN)
end++;
src->seqlo = seq;
if (src->state < TCPS_SYN_SENT)
src->state = TCPS_SYN_SENT;
if (src->seqhi == 1 ||
SEQ_GEQ(end + MAX(1, (u_int32_t)dst->max_win << dws),
src->seqhi))
src->seqhi = end + MAX(1, (u_int32_t)dst->max_win << dws);
if (win > src->max_win)
src->max_win = win;
} else {
ack = ntohl(th->th_ack) - dst->seqdiff;
if (src->seqdiff) {
pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
src->seqdiff), 0);
pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
copyback = off+ sizeof (*th);
}
end = seq + pd->p_len;
if (th->th_flags & TH_SYN)
end++;
if (th->th_flags & TH_FIN)
end++;
}
if ((th->th_flags & TH_ACK) == 0) {
ack = dst->seqlo;
} else if ((ack == 0 &&
(th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
(dst->state < TCPS_SYN_SENT)) {
ack = dst->seqlo;
}
if (seq == end) {
seq = src->seqlo;
end = seq;
}
ackskew = dst->seqlo - ack;
if (dst->seqdiff && (th->th_off << 2) > (int)sizeof (struct tcphdr)) {
copyback = pf_modulate_sack(m, off, pd, th, dst);
if (copyback == -1) {
REASON_SET(reason, PFRES_MEMORY);
return (PF_DROP);
}
m = pd->mp;
}
#define MAXACKWINDOW (0xffff + 1500)
if (SEQ_GEQ(src->seqhi, end) &&
SEQ_GEQ(seq, src->seqlo - ((u_int32_t)dst->max_win << dws)) &&
(ackskew >= -MAXACKWINDOW) &&
(ackskew <= (MAXACKWINDOW << sws)) &&
((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo ||
(orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) ||
(pd->flags & PFDESC_IP_REAS) == 0)) {
if (dst->scrub || src->scrub) {
if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
*state, src, dst, ©back))
return (PF_DROP);
m = pd->mp;
}
if (src->max_win < win)
src->max_win = win;
if (SEQ_GT(end, src->seqlo))
src->seqlo = end;
if (SEQ_GEQ(ack + ((u_int32_t)win << sws), dst->seqhi))
dst->seqhi = ack + MAX(((u_int32_t)win << sws), 1);
if (th->th_flags & TH_SYN)
if (src->state < TCPS_SYN_SENT)
src->state = TCPS_SYN_SENT;
if (th->th_flags & TH_FIN)
if (src->state < TCPS_CLOSING)
src->state = TCPS_CLOSING;
if (th->th_flags & TH_ACK) {
if (dst->state == TCPS_SYN_SENT) {
dst->state = TCPS_ESTABLISHED;
if (src->state == TCPS_ESTABLISHED &&
(*state)->src_node != NULL &&
pf_src_connlimit(state)) {
REASON_SET(reason, PFRES_SRCLIMIT);
return (PF_DROP);
}
} else if (dst->state == TCPS_CLOSING)
dst->state = TCPS_FIN_WAIT_2;
}
if (th->th_flags & TH_RST)
src->state = dst->state = TCPS_TIME_WAIT;
(*state)->expire = pf_time_second();
if (src->state >= TCPS_FIN_WAIT_2 &&
dst->state >= TCPS_FIN_WAIT_2)
(*state)->timeout = PFTM_TCP_CLOSED;
else if (src->state >= TCPS_CLOSING &&
dst->state >= TCPS_CLOSING)
(*state)->timeout = PFTM_TCP_FIN_WAIT;
else if (src->state < TCPS_ESTABLISHED ||
dst->state < TCPS_ESTABLISHED)
(*state)->timeout = PFTM_TCP_OPENING;
else if (src->state >= TCPS_CLOSING ||
dst->state >= TCPS_CLOSING)
(*state)->timeout = PFTM_TCP_CLOSING;
else
(*state)->timeout = PFTM_TCP_ESTABLISHED;
} else if ((dst->state < TCPS_SYN_SENT ||
dst->state >= TCPS_FIN_WAIT_2 || src->state >= TCPS_FIN_WAIT_2) &&
SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
if (pf_status.debug >= PF_DEBUG_MISC) {
printf("pf: loose state match: ");
pf_print_state(*state);
pf_print_flags(th->th_flags);
printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
"pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack,
pd->p_len, ackskew, (*state)->packets[0],
(*state)->packets[1],
direction == PF_IN ? "in" : "out",
direction == (*state)->state_key->direction ?
"fwd" : "rev");
}
if (dst->scrub || src->scrub) {
if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
*state, src, dst, ©back))
return (PF_DROP);
m = pd->mp;
}
if (src->max_win < win)
src->max_win = win;
if (SEQ_GT(end, src->seqlo))
src->seqlo = end;
if (SEQ_GEQ(ack + ((u_int32_t)win << sws), dst->seqhi))
dst->seqhi = ack + MAX(((u_int32_t)win << sws), 1);
if (th->th_flags & TH_FIN)
if (src->state < TCPS_CLOSING)
src->state = TCPS_CLOSING;
if (th->th_flags & TH_RST)
src->state = dst->state = TCPS_TIME_WAIT;
} else {
if ((*state)->dst.state == TCPS_SYN_SENT &&
(*state)->src.state == TCPS_SYN_SENT) {
if (!(th->th_flags & TH_RST))
pf_send_tcp((*state)->rule.ptr, pd->af,
pd->dst, pd->src, th->th_dport,
th->th_sport, ntohl(th->th_ack), 0,
TH_RST, 0, 0,
(*state)->rule.ptr->return_ttl, 1, 0,
pd->eh, kif->pfik_ifp);
src->seqlo = 0;
src->seqhi = 1;
src->max_win = 1;
} else if (pf_status.debug >= PF_DEBUG_MISC) {
printf("pf: BAD state: ");
pf_print_state(*state);
pf_print_flags(th->th_flags);
printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
"pkts=%llu:%llu dir=%s,%s\n",
seq, orig_seq, ack, pd->p_len, ackskew,
(*state)->packets[0], (*state)->packets[1],
direction == PF_IN ? "in" : "out",
direction == (*state)->state_key->direction ?
"fwd" : "rev");
printf("pf: State failure on: %c %c %c %c | %c %c\n",
SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
SEQ_GEQ(seq,
src->seqlo - ((u_int32_t)dst->max_win << dws)) ?
' ': '2',
(ackskew >= -MAXACKWINDOW) ? ' ' : '3',
(ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
}
REASON_SET(reason, PFRES_BADSTATE);
return (PF_DROP);
}
if ((*state)->state_key->app_state &&
(*state)->state_key->app_state->handler) {
(*state)->state_key->app_state->handler(*state, direction,
off + (th->th_off << 2), pd, kif);
if (pd->lmw < 0) {
REASON_SET(reason, PFRES_MEMORY);
return (PF_DROP);
}
m = pd->mp;
}
if (STATE_TRANSLATE((*state)->state_key)) {
if (direction == PF_OUT)
pf_change_ap(direction, pd->mp, pd->src, &th->th_sport,
pd->ip_sum, &th->th_sum,
&(*state)->state_key->gwy.addr,
(*state)->state_key->gwy.xport.port, 0, pd->af);
else
pf_change_ap(direction, pd->mp, pd->dst, &th->th_dport,
pd->ip_sum, &th->th_sum,
&(*state)->state_key->lan.addr,
(*state)->state_key->lan.xport.port, 0, pd->af);
copyback = off + sizeof (*th);
}
if (copyback) {
m = pf_lazy_makewritable(pd, m, copyback);
if (!m) {
REASON_SET(reason, PFRES_MEMORY);
return (PF_DROP);
}
m_copyback(m, off, sizeof (*th), th);
}
return (PF_PASS);
}
static int
pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason)
{
#pragma unused(h)
struct pf_state_peer *src, *dst;
struct pf_state_key_cmp key;
struct udphdr *uh = pd->hdr.udp;
struct pf_app_state as;
int dx, action, extfilter;
key.app_state = 0;
key.proto_variant = PF_EXTFILTER_APD;
key.af = pd->af;
key.proto = IPPROTO_UDP;
if (direction == PF_IN) {
PF_ACPY(&key.ext.addr, pd->src, key.af);
PF_ACPY(&key.gwy.addr, pd->dst, key.af);
key.ext.xport.port = uh->uh_sport;
key.gwy.xport.port = uh->uh_dport;
dx = PF_IN;
} else {
PF_ACPY(&key.lan.addr, pd->src, key.af);
PF_ACPY(&key.ext.addr, pd->dst, key.af);
key.lan.xport.port = uh->uh_sport;
key.ext.xport.port = uh->uh_dport;
dx = PF_OUT;
}
if (ntohs(uh->uh_sport) == PF_IKE_PORT &&
ntohs(uh->uh_dport) == PF_IKE_PORT) {
struct pf_ike_hdr ike;
size_t plen = m->m_pkthdr.len - off - sizeof (*uh);
if (plen < PF_IKE_PACKET_MINSIZE) {
DPFPRINTF(PF_DEBUG_MISC,
("pf: IKE message too small.\n"));
return (PF_DROP);
}
if (plen > sizeof (ike))
plen = sizeof (ike);
m_copydata(m, off + sizeof (*uh), plen, &ike);
if (ike.initiator_cookie) {
key.app_state = &as;
as.compare_lan_ext = pf_ike_compare;
as.compare_ext_gwy = pf_ike_compare;
as.u.ike.cookie = ike.initiator_cookie;
} else {
DPFPRINTF(PF_DEBUG_MISC,
("pf: IKE initiator cookie = 0.\n"));
}
}
*state = pf_find_state(kif, &key, dx);
if (!key.app_state && *state == 0) {
key.proto_variant = PF_EXTFILTER_AD;
*state = pf_find_state(kif, &key, dx);
}
if (!key.app_state && *state == 0) {
key.proto_variant = PF_EXTFILTER_EI;
*state = pf_find_state(kif, &key, dx);
}
if ((*state) != NULL && pd != NULL &&
pd->flowhash == 0)
pd->flowhash = (*state)->state_key->flowhash;
if (pf_state_lookup_aux(state, kif, direction, &action))
return (action);
if (direction == (*state)->state_key->direction) {
src = &(*state)->src;
dst = &(*state)->dst;
} else {
src = &(*state)->dst;
dst = &(*state)->src;
}
if (src->state < PFUDPS_SINGLE)
src->state = PFUDPS_SINGLE;
if (dst->state == PFUDPS_SINGLE)
dst->state = PFUDPS_MULTIPLE;
(*state)->expire = pf_time_second();
if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
(*state)->timeout = PFTM_UDP_MULTIPLE;
else
(*state)->timeout = PFTM_UDP_SINGLE;
extfilter = (*state)->state_key->proto_variant;
if (extfilter > PF_EXTFILTER_APD) {
(*state)->state_key->ext.xport.port = key.ext.xport.port;
if (extfilter > PF_EXTFILTER_AD)
PF_ACPY(&(*state)->state_key->ext.addr,
&key.ext.addr, key.af);
}
if ((*state)->state_key->app_state &&
(*state)->state_key->app_state->handler) {
(*state)->state_key->app_state->handler(*state, direction,
off + uh->uh_ulen, pd, kif);
if (pd->lmw < 0) {
REASON_SET(reason, PFRES_MEMORY);
return (PF_DROP);
}
m = pd->mp;
}
if (STATE_TRANSLATE((*state)->state_key)) {
m = pf_lazy_makewritable(pd, m, off + sizeof (*uh));
if (!m) {
REASON_SET(reason, PFRES_MEMORY);
return (PF_DROP);
}
if (direction == PF_OUT)
pf_change_ap(direction, pd->mp, pd->src, &uh->uh_sport,
pd->ip_sum, &uh->uh_sum,
&(*state)->state_key->gwy.addr,
(*state)->state_key->gwy.xport.port, 1, pd->af);
else
pf_change_ap(direction, pd->mp, pd->dst, &uh->uh_dport,
pd->ip_sum, &uh->uh_sum,
&(*state)->state_key->lan.addr,
(*state)->state_key->lan.xport.port, 1, pd->af);
m_copyback(m, off, sizeof (*uh), uh);
}
return (PF_PASS);
}
static int
pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason)
{
#pragma unused(h)
struct pf_addr *saddr = pd->src, *daddr = pd->dst;
u_int16_t icmpid = 0, *icmpsum;
u_int8_t icmptype;
int state_icmp = 0;
struct pf_state_key_cmp key;
struct pf_app_state as;
key.app_state = 0;
switch (pd->proto) {
#if INET
case IPPROTO_ICMP:
icmptype = pd->hdr.icmp->icmp_type;
icmpid = pd->hdr.icmp->icmp_id;
icmpsum = &pd->hdr.icmp->icmp_cksum;
if (icmptype == ICMP_UNREACH ||
icmptype == ICMP_SOURCEQUENCH ||
icmptype == ICMP_REDIRECT ||
icmptype == ICMP_TIMXCEED ||
icmptype == ICMP_PARAMPROB)
state_icmp++;
break;
#endif
#if INET6
case IPPROTO_ICMPV6:
icmptype = pd->hdr.icmp6->icmp6_type;
icmpid = pd->hdr.icmp6->icmp6_id;
icmpsum = &pd->hdr.icmp6->icmp6_cksum;
if (icmptype == ICMP6_DST_UNREACH ||
icmptype == ICMP6_PACKET_TOO_BIG ||
icmptype == ICMP6_TIME_EXCEEDED ||
icmptype == ICMP6_PARAM_PROB)
state_icmp++;
break;
#endif
}
if (!state_icmp) {
key.af = pd->af;
key.proto = pd->proto;
if (direction == PF_IN) {
PF_ACPY(&key.ext.addr, pd->src, key.af);
PF_ACPY(&key.gwy.addr, pd->dst, key.af);
key.ext.xport.port = 0;
key.gwy.xport.port = icmpid;
} else {
PF_ACPY(&key.lan.addr, pd->src, key.af);
PF_ACPY(&key.ext.addr, pd->dst, key.af);
key.lan.xport.port = icmpid;
key.ext.xport.port = 0;
}
STATE_LOOKUP();
(*state)->expire = pf_time_second();
(*state)->timeout = PFTM_ICMP_ERROR_REPLY;
if (STATE_TRANSLATE((*state)->state_key)) {
if (direction == PF_OUT) {
switch (pd->af) {
#if INET
case AF_INET:
pf_change_a(&saddr->v4.s_addr,
pd->ip_sum,
(*state)->state_key->gwy.addr.v4.s_addr, 0);
pd->hdr.icmp->icmp_cksum =
pf_cksum_fixup(
pd->hdr.icmp->icmp_cksum, icmpid,
(*state)->state_key->gwy.xport.port, 0);
pd->hdr.icmp->icmp_id =
(*state)->state_key->gwy.xport.port;
m = pf_lazy_makewritable(pd, m,
off + ICMP_MINLEN);
if (!m)
return (PF_DROP);
m_copyback(m, off, ICMP_MINLEN,
pd->hdr.icmp);
break;
#endif
#if INET6
case AF_INET6:
pf_change_a6(saddr,
&pd->hdr.icmp6->icmp6_cksum,
&(*state)->state_key->gwy.addr, 0);
m = pf_lazy_makewritable(pd, m,
off + sizeof (struct icmp6_hdr));
if (!m)
return (PF_DROP);
m_copyback(m, off,
sizeof (struct icmp6_hdr),
pd->hdr.icmp6);
break;
#endif
}
} else {
switch (pd->af) {
#if INET
case AF_INET:
pf_change_a(&daddr->v4.s_addr,
pd->ip_sum,
(*state)->state_key->lan.addr.v4.s_addr, 0);
pd->hdr.icmp->icmp_cksum =
pf_cksum_fixup(
pd->hdr.icmp->icmp_cksum, icmpid,
(*state)->state_key->lan.xport.port, 0);
pd->hdr.icmp->icmp_id =
(*state)->state_key->lan.xport.port;
m = pf_lazy_makewritable(pd, m,
off + ICMP_MINLEN);
if (!m)
return (PF_DROP);
m_copyback(m, off, ICMP_MINLEN,
pd->hdr.icmp);
break;
#endif
#if INET6
case AF_INET6:
pf_change_a6(daddr,
&pd->hdr.icmp6->icmp6_cksum,
&(*state)->state_key->lan.addr, 0);
m = pf_lazy_makewritable(pd, m,
off + sizeof (struct icmp6_hdr));
if (!m)
return (PF_DROP);
m_copyback(m, off,
sizeof (struct icmp6_hdr),
pd->hdr.icmp6);
break;
#endif
}
}
}
return (PF_PASS);
} else {
struct pf_pdesc pd2;
#if INET
struct ip h2;
#endif
#if INET6
struct ip6_hdr h2_6;
int terminal = 0;
#endif
int ipoff2 = 0;
int off2 = 0;
memset(&pd2, 0, sizeof (pd2));
pd2.af = pd->af;
switch (pd->af) {
#if INET
case AF_INET:
ipoff2 = off + ICMP_MINLEN;
if (!pf_pull_hdr(m, ipoff2, &h2, sizeof (h2),
NULL, reason, pd2.af)) {
DPFPRINTF(PF_DEBUG_MISC,
("pf: ICMP error message too short "
"(ip)\n"));
return (PF_DROP);
}
if (h2.ip_off & htons(IP_OFFMASK)) {
REASON_SET(reason, PFRES_FRAG);
return (PF_DROP);
}
off2 = ipoff2 + (h2.ip_hl << 2);
pd2.proto = h2.ip_p;
pd2.src = (struct pf_addr *)&h2.ip_src;
pd2.dst = (struct pf_addr *)&h2.ip_dst;
pd2.ip_sum = &h2.ip_sum;
break;
#endif
#if INET6
case AF_INET6:
ipoff2 = off + sizeof (struct icmp6_hdr);
if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof (h2_6),
NULL, reason, pd2.af)) {
DPFPRINTF(PF_DEBUG_MISC,
("pf: ICMP error message too short "
"(ip6)\n"));
return (PF_DROP);
}
pd2.proto = h2_6.ip6_nxt;
pd2.src = (struct pf_addr *)&h2_6.ip6_src;
pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
pd2.ip_sum = NULL;
off2 = ipoff2 + sizeof (h2_6);
do {
switch (pd2.proto) {
case IPPROTO_FRAGMENT:
REASON_SET(reason, PFRES_FRAG);
return (PF_DROP);
case IPPROTO_AH:
case IPPROTO_HOPOPTS:
case IPPROTO_ROUTING:
case IPPROTO_DSTOPTS: {
struct ip6_ext opt6;
if (!pf_pull_hdr(m, off2, &opt6,
sizeof (opt6), NULL, reason,
pd2.af)) {
DPFPRINTF(PF_DEBUG_MISC,
("pf: ICMPv6 short opt\n"));
return (PF_DROP);
}
if (pd2.proto == IPPROTO_AH)
off2 += (opt6.ip6e_len + 2) * 4;
else
off2 += (opt6.ip6e_len + 1) * 8;
pd2.proto = opt6.ip6e_nxt;
break;
}
default:
terminal++;
break;
}
} while (!terminal);
break;
#endif
}
switch (pd2.proto) {
case IPPROTO_TCP: {
struct tcphdr th;
u_int32_t seq;
struct pf_state_peer *src, *dst;
u_int8_t dws;
int copyback = 0;
if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason,
pd2.af)) {
DPFPRINTF(PF_DEBUG_MISC,
("pf: ICMP error message too short "
"(tcp)\n"));
return (PF_DROP);
}
key.af = pd2.af;
key.proto = IPPROTO_TCP;
if (direction == PF_IN) {
PF_ACPY(&key.ext.addr, pd2.dst, key.af);
PF_ACPY(&key.gwy.addr, pd2.src, key.af);
key.ext.xport.port = th.th_dport;
key.gwy.xport.port = th.th_sport;
} else {
PF_ACPY(&key.lan.addr, pd2.dst, key.af);
PF_ACPY(&key.ext.addr, pd2.src, key.af);
key.lan.xport.port = th.th_dport;
key.ext.xport.port = th.th_sport;
}
STATE_LOOKUP();
if (direction == (*state)->state_key->direction) {
src = &(*state)->dst;
dst = &(*state)->src;
} else {
src = &(*state)->src;
dst = &(*state)->dst;
}
if (src->wscale && dst->wscale)
dws = dst->wscale & PF_WSCALE_MASK;
else
dws = 0;
seq = ntohl(th.th_seq) - src->seqdiff;
if (src->seqdiff) {
pf_change_a(&th.th_seq, icmpsum,
htonl(seq), 0);
copyback = 1;
}
if (!SEQ_GEQ(src->seqhi, seq) ||
!SEQ_GEQ(seq,
src->seqlo - ((u_int32_t)dst->max_win << dws))) {
if (pf_status.debug >= PF_DEBUG_MISC) {
printf("pf: BAD ICMP %d:%d ",
icmptype, pd->hdr.icmp->icmp_code);
pf_print_host(pd->src, 0, pd->af);
printf(" -> ");
pf_print_host(pd->dst, 0, pd->af);
printf(" state: ");
pf_print_state(*state);
printf(" seq=%u\n", seq);
}
REASON_SET(reason, PFRES_BADSTATE);
return (PF_DROP);
}
if (STATE_TRANSLATE((*state)->state_key)) {
if (direction == PF_IN) {
pf_change_icmp(pd2.src, &th.th_sport,
daddr, &(*state)->state_key->lan.addr,
(*state)->state_key->lan.xport.port, NULL,
pd2.ip_sum, icmpsum,
pd->ip_sum, 0, pd2.af);
} else {
pf_change_icmp(pd2.dst, &th.th_dport,
saddr, &(*state)->state_key->gwy.addr,
(*state)->state_key->gwy.xport.port, NULL,
pd2.ip_sum, icmpsum,
pd->ip_sum, 0, pd2.af);
}
copyback = 1;
}
if (copyback) {
m = pf_lazy_makewritable(pd, m, off2 + 8);
if (!m)
return (PF_DROP);
switch (pd2.af) {
#if INET
case AF_INET:
m_copyback(m, off, ICMP_MINLEN,
pd->hdr.icmp);
m_copyback(m, ipoff2, sizeof (h2),
&h2);
break;
#endif
#if INET6
case AF_INET6:
m_copyback(m, off,
sizeof (struct icmp6_hdr),
pd->hdr.icmp6);
m_copyback(m, ipoff2, sizeof (h2_6),
&h2_6);
break;
#endif
}
m_copyback(m, off2, 8, &th);
}
return (PF_PASS);
break;
}
case IPPROTO_UDP: {
struct udphdr uh;
int dx, action;
if (!pf_pull_hdr(m, off2, &uh, sizeof (uh),
NULL, reason, pd2.af)) {
DPFPRINTF(PF_DEBUG_MISC,
("pf: ICMP error message too short "
"(udp)\n"));
return (PF_DROP);
}
key.af = pd2.af;
key.proto = IPPROTO_UDP;
if (direction == PF_IN) {
PF_ACPY(&key.ext.addr, pd2.dst, key.af);
PF_ACPY(&key.gwy.addr, pd2.src, key.af);
key.ext.xport.port = uh.uh_dport;
key.gwy.xport.port = uh.uh_sport;
dx = PF_IN;
} else {
PF_ACPY(&key.lan.addr, pd2.dst, key.af);
PF_ACPY(&key.ext.addr, pd2.src, key.af);
key.lan.xport.port = uh.uh_dport;
key.ext.xport.port = uh.uh_sport;
dx = PF_OUT;
}
key.proto_variant = PF_EXTFILTER_APD;
if (ntohs(uh.uh_sport) == PF_IKE_PORT &&
ntohs(uh.uh_dport) == PF_IKE_PORT) {
struct pf_ike_hdr ike;
size_t plen =
m->m_pkthdr.len - off2 - sizeof (uh);
if (direction == PF_IN &&
plen < 8 ) {
DPFPRINTF(PF_DEBUG_MISC, ("pf: "
"ICMP error, embedded IKE message "
"too small.\n"));
return (PF_DROP);
}
if (plen > sizeof (ike))
plen = sizeof (ike);
m_copydata(m, off + sizeof (uh), plen, &ike);
key.app_state = &as;
as.compare_lan_ext = pf_ike_compare;
as.compare_ext_gwy = pf_ike_compare;
as.u.ike.cookie = ike.initiator_cookie;
}
*state = pf_find_state(kif, &key, dx);
if (key.app_state && *state == 0) {
key.app_state = 0;
*state = pf_find_state(kif, &key, dx);
}
if (*state == 0) {
key.proto_variant = PF_EXTFILTER_AD;
*state = pf_find_state(kif, &key, dx);
}
if (*state == 0) {
key.proto_variant = PF_EXTFILTER_EI;
*state = pf_find_state(kif, &key, dx);
}
if (*state != NULL && pd != NULL &&
pd->flowhash == 0)
pd->flowhash = (*state)->state_key->flowhash;
if (pf_state_lookup_aux(state, kif, direction, &action))
return (action);
if (STATE_TRANSLATE((*state)->state_key)) {
if (direction == PF_IN) {
pf_change_icmp(pd2.src, &uh.uh_sport,
daddr, &(*state)->state_key->lan.addr,
(*state)->state_key->lan.xport.port, &uh.uh_sum,
pd2.ip_sum, icmpsum,
pd->ip_sum, 1, pd2.af);
} else {
pf_change_icmp(pd2.dst, &uh.uh_dport,
saddr, &(*state)->state_key->gwy.addr,
(*state)->state_key->gwy.xport.port, &uh.uh_sum,
pd2.ip_sum, icmpsum,
pd->ip_sum, 1, pd2.af);
}
m = pf_lazy_makewritable(pd, m,
off2 + sizeof (uh));
if (!m)
return (PF_DROP);
switch (pd2.af) {
#if INET
case AF_INET:
m_copyback(m, off, ICMP_MINLEN,
pd->hdr.icmp);
m_copyback(m, ipoff2, sizeof (h2), &h2);
break;
#endif
#if INET6
case AF_INET6:
m_copyback(m, off,
sizeof (struct icmp6_hdr),
pd->hdr.icmp6);
m_copyback(m, ipoff2, sizeof (h2_6),
&h2_6);
break;
#endif
}
m_copyback(m, off2, sizeof (uh), &uh);
}
return (PF_PASS);
break;
}
#if INET
case IPPROTO_ICMP: {
struct icmp iih;
if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
NULL, reason, pd2.af)) {
DPFPRINTF(PF_DEBUG_MISC,
("pf: ICMP error message too short i"
"(icmp)\n"));
return (PF_DROP);
}
key.af = pd2.af;
key.proto = IPPROTO_ICMP;
if (direction == PF_IN) {
PF_ACPY(&key.ext.addr, pd2.dst, key.af);
PF_ACPY(&key.gwy.addr, pd2.src, key.af);
key.ext.xport.port = 0;
key.gwy.xport.port = iih.icmp_id;
} else {
PF_ACPY(&key.lan.addr, pd2.dst, key.af);
PF_ACPY(&key.ext.addr, pd2.src, key.af);
key.lan.xport.port = iih.icmp_id;
key.ext.xport.port = 0;
}
STATE_LOOKUP();
if (STATE_TRANSLATE((*state)->state_key)) {
if (direction == PF_IN) {
pf_change_icmp(pd2.src, &iih.icmp_id,
daddr, &(*state)->state_key->lan.addr,
(*state)->state_key->lan.xport.port, NULL,
pd2.ip_sum, icmpsum,
pd->ip_sum, 0, AF_INET);
} else {
pf_change_icmp(pd2.dst, &iih.icmp_id,
saddr, &(*state)->state_key->gwy.addr,
(*state)->state_key->gwy.xport.port, NULL,
pd2.ip_sum, icmpsum,
pd->ip_sum, 0, AF_INET);
}
m = pf_lazy_makewritable(pd, m, off2 + ICMP_MINLEN);
if (!m)
return (PF_DROP);
m_copyback(m, off, ICMP_MINLEN, pd->hdr.icmp);
m_copyback(m, ipoff2, sizeof (h2), &h2);
m_copyback(m, off2, ICMP_MINLEN, &iih);
}
return (PF_PASS);
break;
}
#endif
#if INET6
case IPPROTO_ICMPV6: {
struct icmp6_hdr iih;
if (!pf_pull_hdr(m, off2, &iih,
sizeof (struct icmp6_hdr), NULL, reason, pd2.af)) {
DPFPRINTF(PF_DEBUG_MISC,
("pf: ICMP error message too short "
"(icmp6)\n"));
return (PF_DROP);
}
key.af = pd2.af;
key.proto = IPPROTO_ICMPV6;
if (direction == PF_IN) {
PF_ACPY(&key.ext.addr, pd2.dst, key.af);
PF_ACPY(&key.gwy.addr, pd2.src, key.af);
key.ext.xport.port = 0;
key.gwy.xport.port = iih.icmp6_id;
} else {
PF_ACPY(&key.lan.addr, pd2.dst, key.af);
PF_ACPY(&key.ext.addr, pd2.src, key.af);
key.lan.xport.port = iih.icmp6_id;
key.ext.xport.port = 0;
}
STATE_LOOKUP();
if (STATE_TRANSLATE((*state)->state_key)) {
if (direction == PF_IN) {
pf_change_icmp(pd2.src, &iih.icmp6_id,
daddr, &(*state)->state_key->lan.addr,
(*state)->state_key->lan.xport.port, NULL,
pd2.ip_sum, icmpsum,
pd->ip_sum, 0, AF_INET6);
} else {
pf_change_icmp(pd2.dst, &iih.icmp6_id,
saddr, &(*state)->state_key->gwy.addr,
(*state)->state_key->gwy.xport.port, NULL,
pd2.ip_sum, icmpsum,
pd->ip_sum, 0, AF_INET6);
}
m = pf_lazy_makewritable(pd, m, off2 +
sizeof (struct icmp6_hdr));
if (!m)
return (PF_DROP);
m_copyback(m, off, sizeof (struct icmp6_hdr),
pd->hdr.icmp6);
m_copyback(m, ipoff2, sizeof (h2_6), &h2_6);
m_copyback(m, off2, sizeof (struct icmp6_hdr),
&iih);
}
return (PF_PASS);
break;
}
#endif
default: {
key.af = pd2.af;
key.proto = pd2.proto;
if (direction == PF_IN) {
PF_ACPY(&key.ext.addr, pd2.dst, key.af);
PF_ACPY(&key.gwy.addr, pd2.src, key.af);
key.ext.xport.port = 0;
key.gwy.xport.port = 0;
} else {
PF_ACPY(&key.lan.addr, pd2.dst, key.af);
PF_ACPY(&key.ext.addr, pd2.src, key.af);
key.lan.xport.port = 0;
key.ext.xport.port = 0;
}
STATE_LOOKUP();
if (STATE_TRANSLATE((*state)->state_key)) {
if (direction == PF_IN) {
pf_change_icmp(pd2.src, NULL,
daddr, &(*state)->state_key->lan.addr,
0, NULL,
pd2.ip_sum, icmpsum,
pd->ip_sum, 0, pd2.af);
} else {
pf_change_icmp(pd2.dst, NULL,
saddr, &(*state)->state_key->gwy.addr,
0, NULL,
pd2.ip_sum, icmpsum,
pd->ip_sum, 0, pd2.af);
}
switch (pd2.af) {
#if INET
case AF_INET:
m = pf_lazy_makewritable(pd, m,
ipoff2 + sizeof (h2));
if (!m)
return (PF_DROP);
#endif
#if INET6
case AF_INET6:
m = pf_lazy_makewritable(pd, m,
ipoff2 + sizeof (h2_6));
if (!m)
return (PF_DROP);
m_copyback(m, off,
sizeof (struct icmp6_hdr),
pd->hdr.icmp6);
m_copyback(m, ipoff2, sizeof (h2_6),
&h2_6);
break;
#endif
}
}
return (PF_PASS);
break;
}
}
}
}
static int
pf_test_state_grev1(struct pf_state **state, int direction,
struct pfi_kif *kif, int off, struct pf_pdesc *pd)
{
struct pf_state_peer *src;
struct pf_state_peer *dst;
struct pf_state_key_cmp key;
struct pf_grev1_hdr *grev1 = pd->hdr.grev1;
struct mbuf *m;
key.app_state = 0;
key.af = pd->af;
key.proto = IPPROTO_GRE;
key.proto_variant = PF_GRE_PPTP_VARIANT;
if (direction == PF_IN) {
PF_ACPY(&key.ext.addr, pd->src, key.af);
PF_ACPY(&key.gwy.addr, pd->dst, key.af);
key.gwy.xport.call_id = grev1->call_id;
} else {
PF_ACPY(&key.lan.addr, pd->src, key.af);
PF_ACPY(&key.ext.addr, pd->dst, key.af);
key.ext.xport.call_id = grev1->call_id;
}
STATE_LOOKUP();
if (direction == (*state)->state_key->direction) {
src = &(*state)->src;
dst = &(*state)->dst;
} else {
src = &(*state)->dst;
dst = &(*state)->src;
}
if (src->state < PFGRE1S_INITIATING)
src->state = PFGRE1S_INITIATING;
(*state)->expire = pf_time_second();
if (src->state >= PFGRE1S_INITIATING &&
dst->state >= PFGRE1S_INITIATING) {
if ((*state)->timeout != PFTM_TCP_ESTABLISHED)
(*state)->timeout = PFTM_GREv1_ESTABLISHED;
src->state = PFGRE1S_ESTABLISHED;
dst->state = PFGRE1S_ESTABLISHED;
} else {
(*state)->timeout = PFTM_GREv1_INITIATING;
}
if ((*state)->state_key->app_state)
(*state)->state_key->app_state->u.grev1.pptp_state->expire =
pf_time_second();
if (STATE_GRE_TRANSLATE((*state)->state_key)) {
if (direction == PF_OUT) {
switch (pd->af) {
#if INET
case AF_INET:
pf_change_a(&pd->src->v4.s_addr,
pd->ip_sum,
(*state)->state_key->gwy.addr.v4.s_addr, 0);
break;
#endif
#if INET6
case AF_INET6:
PF_ACPY(pd->src, &(*state)->state_key->gwy.addr,
pd->af);
break;
#endif
}
} else {
grev1->call_id = (*state)->state_key->lan.xport.call_id;
switch (pd->af) {
#if INET
case AF_INET:
pf_change_a(&pd->dst->v4.s_addr,
pd->ip_sum,
(*state)->state_key->lan.addr.v4.s_addr, 0);
break;
#endif
#if INET6
case AF_INET6:
PF_ACPY(pd->dst, &(*state)->state_key->lan.addr,
pd->af);
break;
#endif
}
}
m = pf_lazy_makewritable(pd, pd->mp, off + sizeof (*grev1));
if (!m)
return (PF_DROP);
m_copyback(m, off, sizeof (*grev1), grev1);
}
return (PF_PASS);
}
static int
pf_test_state_esp(struct pf_state **state, int direction, struct pfi_kif *kif,
int off, struct pf_pdesc *pd)
{
#pragma unused(off)
struct pf_state_peer *src;
struct pf_state_peer *dst;
struct pf_state_key_cmp key;
struct pf_esp_hdr *esp = pd->hdr.esp;
int action;
memset(&key, 0, sizeof (key));
key.af = pd->af;
key.proto = IPPROTO_ESP;
if (direction == PF_IN) {
PF_ACPY(&key.ext.addr, pd->src, key.af);
PF_ACPY(&key.gwy.addr, pd->dst, key.af);
key.gwy.xport.spi = esp->spi;
} else {
PF_ACPY(&key.lan.addr, pd->src, key.af);
PF_ACPY(&key.ext.addr, pd->dst, key.af);
key.ext.xport.spi = esp->spi;
}
*state = pf_find_state(kif, &key, direction);
if (*state == 0) {
struct pf_state *s;
if (direction == PF_IN) {
key.gwy.xport.spi = 0;
s = pf_find_state(kif, &key, direction);
if (s) {
struct pf_state_key *sk = s->state_key;
RB_REMOVE(pf_state_tree_ext_gwy,
&pf_statetbl_ext_gwy, sk);
sk->lan.xport.spi = sk->gwy.xport.spi =
esp->spi;
if (RB_INSERT(pf_state_tree_ext_gwy,
&pf_statetbl_ext_gwy, sk))
pf_detach_state(s, PF_DT_SKIP_EXTGWY);
else
*state = s;
}
} else {
key.ext.xport.spi = 0;
s = pf_find_state(kif, &key, direction);
if (s) {
struct pf_state_key *sk = s->state_key;
RB_REMOVE(pf_state_tree_lan_ext,
&pf_statetbl_lan_ext, sk);
sk->ext.xport.spi = esp->spi;
if (RB_INSERT(pf_state_tree_lan_ext,
&pf_statetbl_lan_ext, sk))
pf_detach_state(s, PF_DT_SKIP_LANEXT);
else
*state = s;
}
}
if (s) {
if (*state == 0) {
#if NPFSYNC
if (s->creatorid == pf_status.hostid)
pfsync_delete_state(s);
#endif
s->timeout = PFTM_UNLINKED;
hook_runloop(&s->unlink_hooks,
HOOK_REMOVE|HOOK_FREE);
pf_src_tree_remove_state(s);
pf_free_state(s);
return (PF_DROP);
}
}
}
if (*state != NULL && pd != NULL &&
pd->flowhash == 0) {
pd->flowhash = (*state)->state_key->flowhash;
}
if (pf_state_lookup_aux(state, kif, direction, &action))
return (action);
if (direction == (*state)->state_key->direction) {
src = &(*state)->src;
dst = &(*state)->dst;
} else {
src = &(*state)->dst;
dst = &(*state)->src;
}
if (src->state < PFESPS_INITIATING)
src->state = PFESPS_INITIATING;
(*state)->expire = pf_time_second();
if (src->state >= PFESPS_INITIATING &&
dst->state >= PFESPS_INITIATING) {
(*state)->timeout = PFTM_ESP_ESTABLISHED;
src->state = PFESPS_ESTABLISHED;
dst->state = PFESPS_ESTABLISHED;
} else {
(*state)->timeout = PFTM_ESP_INITIATING;
}
if (STATE_ADDR_TRANSLATE((*state)->state_key)) {
if (direction == PF_OUT) {
switch (pd->af) {
#if INET
case AF_INET:
pf_change_a(&pd->src->v4.s_addr,
pd->ip_sum,
(*state)->state_key->gwy.addr.v4.s_addr, 0);
break;
#endif
#if INET6
case AF_INET6:
PF_ACPY(pd->src, &(*state)->state_key->gwy.addr,
pd->af);
break;
#endif
}
} else {
switch (pd->af) {
#if INET
case AF_INET:
pf_change_a(&pd->dst->v4.s_addr,
pd->ip_sum,
(*state)->state_key->lan.addr.v4.s_addr, 0);
break;
#endif
#if INET6
case AF_INET6:
PF_ACPY(pd->dst, &(*state)->state_key->lan.addr,
pd->af);
break;
#endif
}
}
}
return (PF_PASS);
}
static int
pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
struct pf_pdesc *pd)
{
struct pf_state_peer *src, *dst;
struct pf_state_key_cmp key;
key.app_state = 0;
key.af = pd->af;
key.proto = pd->proto;
if (direction == PF_IN) {
PF_ACPY(&key.ext.addr, pd->src, key.af);
PF_ACPY(&key.gwy.addr, pd->dst, key.af);
key.ext.xport.port = 0;
key.gwy.xport.port = 0;
} else {
PF_ACPY(&key.lan.addr, pd->src, key.af);
PF_ACPY(&key.ext.addr, pd->dst, key.af);
key.lan.xport.port = 0;
key.ext.xport.port = 0;
}
STATE_LOOKUP();
if (direction == (*state)->state_key->direction) {
src = &(*state)->src;
dst = &(*state)->dst;
} else {
src = &(*state)->dst;
dst = &(*state)->src;
}
if (src->state < PFOTHERS_SINGLE)
src->state = PFOTHERS_SINGLE;
if (dst->state == PFOTHERS_SINGLE)
dst->state = PFOTHERS_MULTIPLE;
(*state)->expire = pf_time_second();
if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
(*state)->timeout = PFTM_OTHER_MULTIPLE;
else
(*state)->timeout = PFTM_OTHER_SINGLE;
if (STATE_ADDR_TRANSLATE((*state)->state_key)) {
if (direction == PF_OUT) {
switch (pd->af) {
#if INET
case AF_INET:
pf_change_a(&pd->src->v4.s_addr,
pd->ip_sum,
(*state)->state_key->gwy.addr.v4.s_addr,
0);
break;
#endif
#if INET6
case AF_INET6:
PF_ACPY(pd->src,
&(*state)->state_key->gwy.addr, pd->af);
break;
#endif
}
} else {
switch (pd->af) {
#if INET
case AF_INET:
pf_change_a(&pd->dst->v4.s_addr,
pd->ip_sum,
(*state)->state_key->lan.addr.v4.s_addr,
0);
break;
#endif
#if INET6
case AF_INET6:
PF_ACPY(pd->dst,
&(*state)->state_key->lan.addr, pd->af);
break;
#endif
}
}
}
return (PF_PASS);
}
void *
pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
u_short *actionp, u_short *reasonp, sa_family_t af)
{
switch (af) {
#if INET
case AF_INET: {
struct ip *h = mtod(m, struct ip *);
u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3;
if (fragoff) {
if (fragoff >= len) {
ACTION_SET(actionp, PF_PASS);
} else {
ACTION_SET(actionp, PF_DROP);
REASON_SET(reasonp, PFRES_FRAG);
}
return (NULL);
}
if (m->m_pkthdr.len < off + len ||
ntohs(h->ip_len) < off + len) {
ACTION_SET(actionp, PF_DROP);
REASON_SET(reasonp, PFRES_SHORT);
return (NULL);
}
break;
}
#endif
#if INET6
case AF_INET6: {
struct ip6_hdr *h = mtod(m, struct ip6_hdr *);
if (m->m_pkthdr.len < off + len ||
(ntohs(h->ip6_plen) + sizeof (struct ip6_hdr)) <
(unsigned)(off + len)) {
ACTION_SET(actionp, PF_DROP);
REASON_SET(reasonp, PFRES_SHORT);
return (NULL);
}
break;
}
#endif
}
m_copydata(m, off, len, p);
return (p);
}
int
pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif)
{
#pragma unused(kif)
struct sockaddr_in *dst;
int ret = 1;
#if INET6
struct sockaddr_in6 *dst6;
struct route_in6 ro;
#else
struct route ro;
#endif
bzero(&ro, sizeof (ro));
switch (af) {
case AF_INET:
dst = satosin(&ro.ro_dst);
dst->sin_family = AF_INET;
dst->sin_len = sizeof (*dst);
dst->sin_addr = addr->v4;
break;
#if INET6
case AF_INET6:
dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
dst6->sin6_family = AF_INET6;
dst6->sin6_len = sizeof (*dst6);
dst6->sin6_addr = addr->v6;
break;
#endif
default:
return (0);
}
if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
goto out;
rtalloc((struct route *)&ro);
out:
if (ro.ro_rt != NULL)
RTFREE(ro.ro_rt);
return (ret);
}
int
pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw)
{
#pragma unused(aw)
struct sockaddr_in *dst;
#if INET6
struct sockaddr_in6 *dst6;
struct route_in6 ro;
#else
struct route ro;
#endif
int ret = 0;
bzero(&ro, sizeof (ro));
switch (af) {
case AF_INET:
dst = satosin(&ro.ro_dst);
dst->sin_family = AF_INET;
dst->sin_len = sizeof (*dst);
dst->sin_addr = addr->v4;
break;
#if INET6
case AF_INET6:
dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
dst6->sin6_family = AF_INET6;
dst6->sin6_len = sizeof (*dst6);
dst6->sin6_addr = addr->v6;
break;
#endif
default:
return (0);
}
rtalloc((struct route *)&ro);
if (ro.ro_rt != NULL) {
RTFREE(ro.ro_rt);
}
return (ret);
}
#if INET
static void
pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
struct pf_state *s, struct pf_pdesc *pd)
{
#pragma unused(pd)
struct mbuf *m0, *m1;
struct route iproute;
struct route *ro = NULL;
struct sockaddr_in *dst;
struct ip *ip;
struct ifnet *ifp = NULL;
struct pf_addr naddr;
struct pf_src_node *sn = NULL;
int error = 0;
int sw_csum = 0;
if (m == NULL || *m == NULL || r == NULL ||
(dir != PF_IN && dir != PF_OUT) || oifp == NULL)
panic("pf_route: invalid parameters");
if (pd->pf_mtag->pftag_routed++ > 3) {
m0 = *m;
*m = NULL;
goto bad;
}
if (r->rt == PF_DUPTO) {
if ((m0 = m_copym(*m, 0, M_COPYALL, M_NOWAIT)) == NULL)
return;
} else {
if ((r->rt == PF_REPLYTO) == (r->direction == dir))
return;
m0 = *m;
}
if (m0->m_len < (int)sizeof (struct ip)) {
DPFPRINTF(PF_DEBUG_URGENT,
("pf_route: m0->m_len < sizeof (struct ip)\n"));
goto bad;
}
ip = mtod(m0, struct ip *);
ro = &iproute;
bzero((caddr_t)ro, sizeof (*ro));
dst = satosin((void *)&ro->ro_dst);
dst->sin_family = AF_INET;
dst->sin_len = sizeof (*dst);
dst->sin_addr = ip->ip_dst;
if (r->rt == PF_FASTROUTE) {
rtalloc(ro);
if (ro->ro_rt == 0) {
ipstat.ips_noroute++;
goto bad;
}
ifp = ro->ro_rt->rt_ifp;
RT_LOCK(ro->ro_rt);
ro->ro_rt->rt_use++;
if (ro->ro_rt->rt_flags & RTF_GATEWAY)
dst = satosin((void *)ro->ro_rt->rt_gateway);
RT_UNLOCK(ro->ro_rt);
} else {
if (TAILQ_EMPTY(&r->rpool.list)) {
DPFPRINTF(PF_DEBUG_URGENT,
("pf_route: TAILQ_EMPTY(&r->rpool.list)\n"));
goto bad;
}
if (s == NULL) {
pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
&naddr, NULL, &sn);
if (!PF_AZERO(&naddr, AF_INET))
dst->sin_addr.s_addr = naddr.v4.s_addr;
ifp = r->rpool.cur->kif ?
r->rpool.cur->kif->pfik_ifp : NULL;
} else {
if (!PF_AZERO(&s->rt_addr, AF_INET))
dst->sin_addr.s_addr =
s->rt_addr.v4.s_addr;
ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
}
}
if (ifp == NULL)
goto bad;
if (oifp != ifp) {
if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS)
goto bad;
else if (m0 == NULL)
goto done;
if (m0->m_len < (int)sizeof (struct ip)) {
DPFPRINTF(PF_DEBUG_URGENT,
("pf_route: m0->m_len < sizeof (struct ip)\n"));
goto bad;
}
ip = mtod(m0, struct ip *);
}
m0->m_pkthdr.csum_flags |= CSUM_IP;
sw_csum = m0->m_pkthdr.csum_flags &
~IF_HWASSIST_CSUM_FLAGS(ifp->if_hwassist);
if (ifp->if_hwassist & CSUM_TCP_SUM16) {
if (apple_hwcksum_tx && (m0->m_pkthdr.csum_flags & CSUM_TCP) &&
(ntohs(ip->ip_len) > 50) &&
(ntohs(ip->ip_len) <= ifp->if_mtu)) {
u_short offset = ((ip->ip_hl) << 2) + 14;
u_short csumprev = m0->m_pkthdr.csum_data & 0xffff;
m0->m_pkthdr.csum_flags = CSUM_DATA_VALID |
CSUM_TCP_SUM16;
m0->m_pkthdr.csum_data = (csumprev + offset) << 16 ;
m0->m_pkthdr.csum_data += offset;
sw_csum = CSUM_DELAY_IP;
} else {
sw_csum |= (CSUM_DELAY_DATA & m0->m_pkthdr.csum_flags);
}
} else if (apple_hwcksum_tx == 0) {
sw_csum |= (CSUM_DELAY_DATA | CSUM_DELAY_IP) &
m0->m_pkthdr.csum_flags;
}
if (sw_csum & CSUM_DELAY_DATA) {
in_delayed_cksum(m0);
sw_csum &= ~CSUM_DELAY_DATA;
m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
}
if (apple_hwcksum_tx != 0) {
m0->m_pkthdr.csum_flags &=
IF_HWASSIST_CSUM_FLAGS(ifp->if_hwassist);
} else {
m0->m_pkthdr.csum_flags = 0;
}
if (ntohs(ip->ip_len) <= ifp->if_mtu ||
(ifp->if_hwassist & CSUM_FRAGMENT)) {
ip->ip_sum = 0;
if (sw_csum & CSUM_DELAY_IP)
ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
error = ifnet_output(ifp, PF_INET, m0, ro->ro_rt, sintosa(dst));
goto done;
}
if (ip->ip_off & htons(IP_DF)) {
ipstat.ips_cantfrag++;
if (r->rt != PF_DUPTO) {
icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
ifp->if_mtu);
goto done;
} else
goto bad;
}
m1 = m0;
#if BYTE_ORDER != BIG_ENDIAN
NTOHS(ip->ip_off);
NTOHS(ip->ip_len);
#endif
error = ip_fragment(m0, ifp, ifp->if_mtu, sw_csum);
if (error) {
m0 = NULL;
goto bad;
}
for (m0 = m1; m0; m0 = m1) {
m1 = m0->m_nextpkt;
m0->m_nextpkt = 0;
if (error == 0)
error = ifnet_output(ifp, PF_INET, m0, ro->ro_rt,
sintosa(dst));
else
m_freem(m0);
}
if (error == 0)
ipstat.ips_fragmented++;
done:
if (r->rt != PF_DUPTO)
*m = NULL;
if (ro == &iproute && ro->ro_rt)
RTFREE(ro->ro_rt);
return;
bad:
m_freem(m0);
goto done;
}
#endif
#if INET6
static void
pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
struct pf_state *s, struct pf_pdesc *pd)
{
#pragma unused(pd)
struct mbuf *m0;
struct route_in6 ip6route;
struct route_in6 *ro;
struct sockaddr_in6 *dst;
struct ip6_hdr *ip6;
struct ifnet *ifp = NULL;
struct pf_addr naddr;
struct pf_src_node *sn = NULL;
int error = 0;
if (m == NULL || *m == NULL || r == NULL ||
(dir != PF_IN && dir != PF_OUT) || oifp == NULL)
panic("pf_route6: invalid parameters");
if (pd->pf_mtag->pftag_routed++ > 3) {
m0 = *m;
*m = NULL;
goto bad;
}
if (r->rt == PF_DUPTO) {
if ((m0 = m_copym(*m, 0, M_COPYALL, M_NOWAIT)) == NULL)
return;
} else {
if ((r->rt == PF_REPLYTO) == (r->direction == dir))
return;
m0 = *m;
}
if (m0->m_len < (int)sizeof (struct ip6_hdr)) {
DPFPRINTF(PF_DEBUG_URGENT,
("pf_route6: m0->m_len < sizeof (struct ip6_hdr)\n"));
goto bad;
}
ip6 = mtod(m0, struct ip6_hdr *);
ro = &ip6route;
bzero((caddr_t)ro, sizeof (*ro));
dst = (struct sockaddr_in6 *)&ro->ro_dst;
dst->sin6_family = AF_INET6;
dst->sin6_len = sizeof (*dst);
dst->sin6_addr = ip6->ip6_dst;
if (r->rt == PF_FASTROUTE) {
struct pf_mtag *pf_mtag;
if ((pf_mtag = pf_get_mtag(m0)) == NULL)
goto bad;
pf_mtag->pftag_flags |= PF_TAG_GENERATED;
ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
return;
}
if (TAILQ_EMPTY(&r->rpool.list)) {
DPFPRINTF(PF_DEBUG_URGENT,
("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n"));
goto bad;
}
if (s == NULL) {
pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
&naddr, NULL, &sn);
if (!PF_AZERO(&naddr, AF_INET6))
PF_ACPY((struct pf_addr *)&dst->sin6_addr,
&naddr, AF_INET6);
ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
} else {
if (!PF_AZERO(&s->rt_addr, AF_INET6))
PF_ACPY((struct pf_addr *)&dst->sin6_addr,
&s->rt_addr, AF_INET6);
ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
}
if (ifp == NULL)
goto bad;
if (oifp != ifp) {
if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS)
goto bad;
else if (m0 == NULL)
goto done;
if (m0->m_len < (int)sizeof (struct ip6_hdr)) {
DPFPRINTF(PF_DEBUG_URGENT, ("pf_route6: m0->m_len "
"< sizeof (struct ip6_hdr)\n"));
goto bad;
}
ip6 = mtod(m0, struct ip6_hdr *);
}
if (IN6_IS_SCOPE_EMBED(&dst->sin6_addr))
dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
if ((unsigned)m0->m_pkthdr.len <= ifp->if_mtu) {
error = nd6_output(ifp, ifp, m0, dst, NULL, NULL);
} else {
in6_ifstat_inc(ifp, ifs6_in_toobig);
if (r->rt != PF_DUPTO)
icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
else
goto bad;
}
done:
if (r->rt != PF_DUPTO)
*m = NULL;
return;
bad:
m_freem(m0);
goto done;
}
#endif
static int
pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p,
sa_family_t af)
{
u_int16_t sum;
switch (p) {
case IPPROTO_TCP:
case IPPROTO_UDP:
if (apple_hwcksum_rx && (m->m_pkthdr.csum_flags &
(CSUM_DATA_VALID | CSUM_PSEUDO_HDR)) &&
(m->m_pkthdr.csum_data ^ 0xffff) == 0) {
return (0);
}
break;
case IPPROTO_ICMP:
#if INET6
case IPPROTO_ICMPV6:
#endif
break;
default:
return (1);
}
if (off < (int)sizeof (struct ip) || len < (int)sizeof (struct udphdr))
return (1);
if (m->m_pkthdr.len < off + len)
return (1);
switch (af) {
#if INET
case AF_INET:
if (p == IPPROTO_ICMP) {
if (m->m_len < off)
return (1);
m->m_data += off;
m->m_len -= off;
sum = in_cksum(m, len);
m->m_data -= off;
m->m_len += off;
} else {
if (m->m_len < (int)sizeof (struct ip))
return (1);
sum = inet_cksum(m, p, off, len);
}
break;
#endif
#if INET6
case AF_INET6:
if (m->m_len < (int)sizeof (struct ip6_hdr))
return (1);
sum = inet6_cksum(m, p, off, len);
break;
#endif
default:
return (1);
}
if (sum) {
switch (p) {
case IPPROTO_TCP:
tcpstat.tcps_rcvbadsum++;
break;
case IPPROTO_UDP:
udpstat.udps_badsum++;
break;
case IPPROTO_ICMP:
icmpstat.icps_checksum++;
break;
#if INET6
case IPPROTO_ICMPV6:
icmp6stat.icp6s_checksum++;
break;
#endif
}
return (1);
}
return (0);
}
#if INET
#define PF_APPLE_UPDATE_PDESC_IPv4() \
do { \
if (m && pd.mp && m != pd.mp) { \
m = pd.mp; \
h = mtod(m, struct ip *); \
pd.pf_mtag = pf_get_mtag(m); \
} \
} while (0)
int
pf_test(int dir, struct ifnet *ifp, struct mbuf **m0,
struct ether_header *eh, struct ip_fw_args *fwa)
{
#if !DUMMYNET
#pragma unused(fwa)
#endif
struct pfi_kif *kif;
u_short action = PF_PASS, reason = 0, log = 0;
struct mbuf *m = *m0;
struct ip *h = 0;
struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr;
struct pf_state *s = NULL;
struct pf_state_key *sk = NULL;
struct pf_ruleset *ruleset = NULL;
struct pf_pdesc pd;
int off, dirndx, pqid = 0;
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
if (!pf_status.running)
return (PF_PASS);
memset(&pd, 0, sizeof (pd));
if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) {
DPFPRINTF(PF_DEBUG_URGENT,
("pf_test: pf_get_mtag returned NULL\n"));
return (PF_DROP);
}
if (pd.pf_mtag->pftag_flags & PF_TAG_GENERATED)
return (PF_PASS);
kif = (struct pfi_kif *)ifp->if_pf_kif;
if (kif == NULL) {
DPFPRINTF(PF_DEBUG_URGENT,
("pf_test: kif == NULL, if_name %s\n", ifp->if_name));
return (PF_DROP);
}
if (kif->pfik_flags & PFI_IFLAG_SKIP)
return (PF_PASS);
#ifdef DIAGNOSTIC
if ((m->m_flags & M_PKTHDR) == 0)
panic("non-M_PKTHDR is passed to pf_test");
#endif
h = mtod(m, struct ip *);
pd.mp = m;
pd.lmw = 0;
pd.pf_mtag = pf_get_mtag(m);
pd.src = (struct pf_addr *)&h->ip_src;
pd.dst = (struct pf_addr *)&h->ip_dst;
PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET);
pd.ip_sum = &h->ip_sum;
pd.proto = h->ip_p;
pd.proto_variant = 0;
pd.af = AF_INET;
pd.tos = h->ip_tos;
pd.tot_len = ntohs(h->ip_len);
pd.eh = eh;
if (m->m_pkthdr.len < (int)sizeof (*h)) {
action = PF_DROP;
REASON_SET(&reason, PFRES_SHORT);
log = 1;
goto done;
}
#if DUMMYNET
if (fwa != NULL && fwa->fwa_pf_rule != NULL)
goto nonormalize;
#endif
action = pf_normalize_ip(m0, dir, kif, &reason, &pd);
pd.mp = m = *m0;
if (action != PF_PASS || pd.lmw < 0) {
action = PF_DROP;
goto done;
}
#if DUMMYNET
nonormalize:
#endif
m = *m0;
h = mtod(m, struct ip *);
off = h->ip_hl << 2;
if (off < (int)sizeof (*h)) {
action = PF_DROP;
REASON_SET(&reason, PFRES_SHORT);
log = 1;
goto done;
}
pd.src = (struct pf_addr *)&h->ip_src;
pd.dst = (struct pf_addr *)&h->ip_dst;
PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET);
pd.ip_sum = &h->ip_sum;
pd.proto = h->ip_p;
pd.proto_variant = 0;
pd.mp = m;
pd.lmw = 0;
pd.pf_mtag = pf_get_mtag(m);
pd.af = AF_INET;
pd.tos = h->ip_tos;
pd.sc = MBUF_SCIDX(mbuf_get_service_class(m));
pd.tot_len = ntohs(h->ip_len);
pd.eh = eh;
if (pd.pf_mtag != NULL && pd.pf_mtag->pftag_flowhash != 0) {
pd.flowhash = pd.pf_mtag->pftag_flowhash;
pd.flags |= (m->m_pkthdr.m_fhflags & PF_TAG_FLOWADV) ?
PFDESC_FLOW_ADV : 0;
}
if (h->ip_off & htons(IP_MF | IP_OFFMASK)) {
pd.flags |= PFDESC_IP_FRAG;
#if DUMMYNET
action = pf_test_dummynet(&r, dir, kif, &m, &pd, fwa);
if (action == PF_DROP || m == NULL) {
*m0 = NULL;
return (action);
}
#endif
action = pf_test_fragment(&r, dir, kif, m, h,
&pd, &a, &ruleset);
goto done;
}
switch (h->ip_p) {
case IPPROTO_TCP: {
struct tcphdr th;
pd.hdr.tcp = &th;
if (!pf_pull_hdr(m, off, &th, sizeof (th),
&action, &reason, AF_INET)) {
log = action != PF_PASS;
goto done;
}
pd.p_len = pd.tot_len - off - (th.th_off << 2);
if ((th.th_flags & TH_ACK) && pd.p_len == 0)
pqid = 1;
#if DUMMYNET
action = pf_test_dummynet(&r, dir, kif, &m, &pd, fwa);
if (action == PF_DROP || m == NULL) {
*m0 = NULL;
return (action);
}
#endif
action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
if (pd.lmw < 0)
goto done;
PF_APPLE_UPDATE_PDESC_IPv4();
if (action == PF_DROP)
goto done;
action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
&reason);
if (pd.lmw < 0)
goto done;
PF_APPLE_UPDATE_PDESC_IPv4();
if (action == PF_PASS) {
#if NPFSYNC
pfsync_update_state(s);
#endif
r = s->rule.ptr;
a = s->anchor.ptr;
log = s->log;
} else if (s == NULL)
action = pf_test_rule(&r, &s, dir, kif,
m, off, h, &pd, &a, &ruleset, &ipintrq);
break;
}
case IPPROTO_UDP: {
struct udphdr uh;
pd.hdr.udp = &uh;
if (!pf_pull_hdr(m, off, &uh, sizeof (uh),
&action, &reason, AF_INET)) {
log = action != PF_PASS;
goto done;
}
if (uh.uh_dport == 0 ||
ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
ntohs(uh.uh_ulen) < sizeof (struct udphdr)) {
action = PF_DROP;
REASON_SET(&reason, PFRES_SHORT);
goto done;
}
#if DUMMYNET
action = pf_test_dummynet(&r, dir, kif, &m, &pd, fwa);
if (action == PF_DROP || m == NULL) {
*m0 = NULL;
return (action);
}
#endif
action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd,
&reason);
if (pd.lmw < 0)
goto done;
PF_APPLE_UPDATE_PDESC_IPv4();
if (action == PF_PASS) {
#if NPFSYNC
pfsync_update_state(s);
#endif
r = s->rule.ptr;
a = s->anchor.ptr;
log = s->log;
} else if (s == NULL)
action = pf_test_rule(&r, &s, dir, kif,
m, off, h, &pd, &a, &ruleset, &ipintrq);
break;
}
case IPPROTO_ICMP: {
struct icmp ih;
pd.hdr.icmp = &ih;
if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
&action, &reason, AF_INET)) {
log = action != PF_PASS;
goto done;
}
#if DUMMYNET
action = pf_test_dummynet(&r, dir, kif, &m, &pd, fwa);
if (action == PF_DROP || m == NULL) {
*m0 = NULL;
return (action);
}
#endif
action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd,
&reason);
if (pd.lmw < 0)
goto done;
PF_APPLE_UPDATE_PDESC_IPv4();
if (action == PF_PASS) {
#if NPFSYNC
pfsync_update_state(s);
#endif
r = s->rule.ptr;
a = s->anchor.ptr;
log = s->log;
} else if (s == NULL)
action = pf_test_rule(&r, &s, dir, kif,
m, off, h, &pd, &a, &ruleset, &ipintrq);
break;
}
case IPPROTO_ESP: {
struct pf_esp_hdr esp;
pd.hdr.esp = &esp;
if (!pf_pull_hdr(m, off, &esp, sizeof (esp), &action, &reason,
AF_INET)) {
log = action != PF_PASS;
goto done;
}
#if DUMMYNET
action = pf_test_dummynet(&r, dir, kif, &m, &pd, fwa);
if (action == PF_DROP || m == NULL) {
*m0 = NULL;
return (action);
}
#endif
action = pf_test_state_esp(&s, dir, kif, off, &pd);
if (pd.lmw < 0)
goto done;
PF_APPLE_UPDATE_PDESC_IPv4();
if (action == PF_PASS) {
#if NPFSYNC
pfsync_update_state(s);
#endif
r = s->rule.ptr;
a = s->anchor.ptr;
log = s->log;
} else if (s == NULL)
action = pf_test_rule(&r, &s, dir, kif,
m, off, h, &pd, &a, &ruleset, &ipintrq);
break;
}
case IPPROTO_GRE: {
struct pf_grev1_hdr grev1;
pd.hdr.grev1 = &grev1;
if (!pf_pull_hdr(m, off, &grev1, sizeof (grev1), &action,
&reason, AF_INET)) {
log = (action != PF_PASS);
goto done;
}
#if DUMMYNET
action = pf_test_dummynet(&r, dir, kif, &m, &pd, fwa);
if (action == PF_DROP || m == NULL) {
*m0 = NULL;
return (action);
}
#endif
if ((ntohs(grev1.flags) & PF_GRE_FLAG_VERSION_MASK) == 1 &&
ntohs(grev1.protocol_type) == PF_GRE_PPP_ETHERTYPE) {
if (ntohs(grev1.payload_length) >
m->m_pkthdr.len - off) {
action = PF_DROP;
REASON_SET(&reason, PFRES_SHORT);
goto done;
}
pd.proto_variant = PF_GRE_PPTP_VARIANT;
action = pf_test_state_grev1(&s, dir, kif, off, &pd);
if (pd.lmw < 0) goto done;
PF_APPLE_UPDATE_PDESC_IPv4();
if (action == PF_PASS) {
#if NPFSYNC
pfsync_update_state(s);
#endif
r = s->rule.ptr;
a = s->anchor.ptr;
log = s->log;
break;
} else if (s == NULL) {
action = pf_test_rule(&r, &s, dir, kif, m, off,
h, &pd, &a, &ruleset, &ipintrq);
if (action == PF_PASS)
break;
}
}
}
default:
#if DUMMYNET
action = pf_test_dummynet(&r, dir, kif, &m, &pd, fwa);
if (action == PF_DROP || m == NULL) {
*m0 = NULL;
return (action);
}
#endif
action = pf_test_state_other(&s, dir, kif, &pd);
if (pd.lmw < 0)
goto done;
PF_APPLE_UPDATE_PDESC_IPv4();
if (action == PF_PASS) {
#if NPFSYNC
pfsync_update_state(s);
#endif
r = s->rule.ptr;
a = s->anchor.ptr;
log = s->log;
} else if (s == NULL)
action = pf_test_rule(&r, &s, dir, kif, m, off, h,
&pd, &a, &ruleset, &ipintrq);
break;
}
done:
*m0 = pd.mp;
PF_APPLE_UPDATE_PDESC_IPv4();
if (action == PF_PASS && h->ip_hl > 5 &&
!((s && s->allow_opts) || r->allow_opts)) {
action = PF_DROP;
REASON_SET(&reason, PFRES_IPOPTIONS);
log = 1;
DPFPRINTF(PF_DEBUG_MISC,
("pf: dropping packet with ip options [hlen=%u]\n",
(unsigned int) h->ip_hl));
}
if ((s && s->tag) || PF_RTABLEID_IS_VALID(r->rtableid) ||
pd.flowhash != 0)
(void) pf_tag_packet(m, pd.pf_mtag, s ? s->tag : 0,
r->rtableid, &pd);
if (action == PF_PASS) {
#if PF_ALTQ
if (altq_allowed && r->qid) {
if (pqid || (pd.tos & IPTOS_LOWDELAY))
pd.pf_mtag->pftag_qid = r->pqid;
else
pd.pf_mtag->pftag_qid = r->qid;
}
#endif
pd.pf_mtag->pftag_hdr = h;
pd.pf_mtag->pftag_flags &= ~PF_TAG_HDR_INET6;
pd.pf_mtag->pftag_flags |= PF_TAG_HDR_INET;
if (pd.proto == IPPROTO_TCP)
pd.pf_mtag->pftag_flags |= PF_TAG_TCP;
else
pd.pf_mtag->pftag_flags &= ~PF_TAG_TCP;
}
if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
(s->nat_rule.ptr->action == PF_RDR ||
s->nat_rule.ptr->action == PF_BINAT) &&
(ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET)
pd.pf_mtag->pftag_flags |= PF_TAG_TRANSLATE_LOCALHOST;
if (log) {
struct pf_rule *lr;
if (s != NULL && s->nat_rule.ptr != NULL &&
s->nat_rule.ptr->log & PF_LOG_ALL)
lr = s->nat_rule.ptr;
else
lr = r;
PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset,
&pd);
}
kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
if (action == PF_PASS || r->action == PF_DROP) {
dirndx = (dir == PF_OUT);
r->packets[dirndx]++;
r->bytes[dirndx] += pd.tot_len;
if (a != NULL) {
a->packets[dirndx]++;
a->bytes[dirndx] += pd.tot_len;
}
if (s != NULL) {
sk = s->state_key;
if (s->nat_rule.ptr != NULL) {
s->nat_rule.ptr->packets[dirndx]++;
s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
}
if (s->src_node != NULL) {
s->src_node->packets[dirndx]++;
s->src_node->bytes[dirndx] += pd.tot_len;
}
if (s->nat_src_node != NULL) {
s->nat_src_node->packets[dirndx]++;
s->nat_src_node->bytes[dirndx] += pd.tot_len;
}
dirndx = (dir == sk->direction) ? 0 : 1;
s->packets[dirndx]++;
s->bytes[dirndx] += pd.tot_len;
}
tr = r;
nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
if (nr != NULL) {
struct pf_addr *x;
if (r == &pf_default_rule) {
tr = nr;
x = (sk == NULL || sk->direction == dir) ?
&pd.baddr : &pd.naddr;
} else
x = (sk == NULL || sk->direction == dir) ?
&pd.naddr : &pd.baddr;
if (x == &pd.baddr || s == NULL) {
if (dir == PF_OUT)
pd.src = x;
else
pd.dst = x;
}
}
if (tr->src.addr.type == PF_ADDR_TABLE)
pfr_update_stats(tr->src.addr.p.tbl, (sk == NULL ||
sk->direction == dir) ?
pd.src : pd.dst, pd.af,
pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
tr->src.neg);
if (tr->dst.addr.type == PF_ADDR_TABLE)
pfr_update_stats(tr->dst.addr.p.tbl, (sk == NULL ||
sk->direction == dir) ? pd.dst : pd.src, pd.af,
pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
tr->dst.neg);
}
VERIFY(m == NULL || pd.mp == NULL || pd.mp == m);
if (*m0) {
if (pd.lmw < 0) {
REASON_SET(&reason, PFRES_MEMORY);
action = PF_DROP;
}
if (action == PF_DROP) {
m_freem(*m0);
*m0 = NULL;
return (PF_DROP);
}
*m0 = m;
}
if (action == PF_SYNPROXY_DROP) {
m_freem(*m0);
*m0 = NULL;
action = PF_PASS;
} else if (r->rt)
pf_route(m0, r, dir, kif->pfik_ifp, s, &pd);
return (action);
}
#endif
#if INET6
#define PF_APPLE_UPDATE_PDESC_IPv6() \
do { \
if (m && pd.mp && m != pd.mp) { \
if (n == m) \
n = pd.mp; \
m = pd.mp; \
h = mtod(m, struct ip6_hdr *); \
} \
} while (0)
int
pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0,
struct ether_header *eh, struct ip_fw_args *fwa)
{
#if !DUMMYNET
#pragma unused(fwa)
#endif
struct pfi_kif *kif;
u_short action = PF_PASS, reason = 0, log = 0;
struct mbuf *m = *m0, *n = NULL;
struct ip6_hdr *h;
struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr;
struct pf_state *s = NULL;
struct pf_state_key *sk = NULL;
struct pf_ruleset *ruleset = NULL;
struct pf_pdesc pd;
int off, terminal = 0, dirndx, rh_cnt = 0;
u_int8_t nxt;
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
if (!pf_status.running)
return (PF_PASS);
memset(&pd, 0, sizeof (pd));
if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) {
DPFPRINTF(PF_DEBUG_URGENT,
("pf_test6: pf_get_mtag returned NULL\n"));
return (PF_DROP);
}
if (pd.pf_mtag->pftag_flags & PF_TAG_GENERATED)
return (PF_PASS);
kif = (struct pfi_kif *)ifp->if_pf_kif;
if (kif == NULL) {
DPFPRINTF(PF_DEBUG_URGENT,
("pf_test6: kif == NULL, if_name %s\n", ifp->if_name));
return (PF_DROP);
}
if (kif->pfik_flags & PFI_IFLAG_SKIP)
return (PF_PASS);
#ifdef DIAGNOSTIC
if ((m->m_flags & M_PKTHDR) == 0)
panic("non-M_PKTHDR is passed to pf_test6");
#endif
h = mtod(m, struct ip6_hdr *);
nxt = h->ip6_nxt;
off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
pd.mp = m;
pd.lmw = 0;
pd.pf_mtag = pf_get_mtag(m);
pd.src = (struct pf_addr *)&h->ip6_src;
pd.dst = (struct pf_addr *)&h->ip6_dst;
PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6);
pd.ip_sum = NULL;
pd.af = AF_INET6;
pd.proto = nxt;
pd.proto_variant = 0;
pd.tos = 0;
pd.sc = MBUF_SCIDX(mbuf_get_service_class(m));
pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
pd.eh = eh;
if (pd.pf_mtag->pftag_flowhash != 0) {
pd.flowhash = pd.pf_mtag->pftag_flowhash;
pd.flags |= (m->m_pkthdr.m_fhflags & PF_TAG_FLOWADV) ?
PFDESC_FLOW_ADV : 0;
}
if (m->m_pkthdr.len < (int)sizeof (*h)) {
action = PF_DROP;
REASON_SET(&reason, PFRES_SHORT);
log = 1;
goto done;
}
#if DUMMYNET
if (fwa != NULL && fwa->fwa_pf_rule != NULL)
goto nonormalize;
#endif
action = pf_normalize_ip6(m0, dir, kif, &reason, &pd);
pd.mp = m = *m0;
if (action != PF_PASS || pd.lmw < 0) {
action = PF_DROP;
goto done;
}
#if DUMMYNET
nonormalize:
#endif
h = mtod(m, struct ip6_hdr *);
#if 1
if (htons(h->ip6_plen) == 0) {
action = PF_DROP;
REASON_SET(&reason, PFRES_NORM);
goto done;
}
#endif
pd.src = (struct pf_addr *)&h->ip6_src;
pd.dst = (struct pf_addr *)&h->ip6_dst;
PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6);
pd.ip_sum = NULL;
pd.af = AF_INET6;
pd.tos = 0;
pd.tot_len = ntohs(h->ip6_plen) + sizeof (struct ip6_hdr);
pd.eh = eh;
off = ((caddr_t)h - m->m_data) + sizeof (struct ip6_hdr);
pd.proto = h->ip6_nxt;
pd.proto_variant = 0;
pd.mp = m;
pd.lmw = 0;
pd.pf_mtag = pf_get_mtag(m);
do {
switch (nxt) {
case IPPROTO_FRAGMENT: {
struct ip6_frag ip6f;
pd.flags |= PFDESC_IP_FRAG;
if (!pf_pull_hdr(m, off, &ip6f, sizeof ip6f, NULL,
&reason, pd.af)) {
DPFPRINTF(PF_DEBUG_MISC,
("pf: IPv6 short fragment header\n"));
action = PF_DROP;
REASON_SET(&reason, PFRES_SHORT);
log = 1;
goto done;
}
pd.proto = nxt = ip6f.ip6f_nxt;
#if DUMMYNET
action = pf_test_dummynet(&r, dir, kif, &m, &pd, fwa);
if (action == PF_DROP || m == NULL) {
*m0 = NULL;
return (action);
}
#endif
action = pf_test_fragment(&r, dir, kif, m, h, &pd, &a,
&ruleset);
if (action == PF_DROP) {
REASON_SET(&reason, PFRES_FRAG);
log = 1;
}
goto done;
}
case IPPROTO_ROUTING:
++rh_cnt;
case IPPROTO_AH:
case IPPROTO_HOPOPTS:
case IPPROTO_DSTOPTS: {
struct ip6_ext opt6;
if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
NULL, &reason, pd.af)) {
DPFPRINTF(PF_DEBUG_MISC,
("pf: IPv6 short opt\n"));
action = PF_DROP;
log = 1;
goto done;
}
if (pd.proto == IPPROTO_AH)
off += (opt6.ip6e_len + 2) * 4;
else
off += (opt6.ip6e_len + 1) * 8;
nxt = opt6.ip6e_nxt;
break;
}
default:
terminal++;
break;
}
} while (!terminal);
if (!n)
n = m;
switch (pd.proto) {
case IPPROTO_TCP: {
struct tcphdr th;
pd.hdr.tcp = &th;
if (!pf_pull_hdr(m, off, &th, sizeof (th),
&action, &reason, AF_INET6)) {
log = action != PF_PASS;
goto done;
}
pd.p_len = pd.tot_len - off - (th.th_off << 2);
#if DUMMYNET
action = pf_test_dummynet(&r, dir, kif, &m, &pd, fwa);
if (action == PF_DROP || m == NULL) {
*m0 = NULL;
return (action);
}
#endif
action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
if (pd.lmw < 0)
goto done;
PF_APPLE_UPDATE_PDESC_IPv6();
if (action == PF_DROP)
goto done;
action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
&reason);
if (pd.lmw < 0)
goto done;
PF_APPLE_UPDATE_PDESC_IPv6();
if (action == PF_PASS) {
#if NPFSYNC
pfsync_update_state(s);
#endif
r = s->rule.ptr;
a = s->anchor.ptr;
log = s->log;
} else if (s == NULL)
action = pf_test_rule(&r, &s, dir, kif,
m, off, h, &pd, &a, &ruleset, &ip6intrq);
break;
}
case IPPROTO_UDP: {
struct udphdr uh;
pd.hdr.udp = &uh;
if (!pf_pull_hdr(m, off, &uh, sizeof (uh),
&action, &reason, AF_INET6)) {
log = action != PF_PASS;
goto done;
}
if (uh.uh_dport == 0 ||
ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
ntohs(uh.uh_ulen) < sizeof (struct udphdr)) {
action = PF_DROP;
REASON_SET(&reason, PFRES_SHORT);
goto done;
}
#if DUMMYNET
action = pf_test_dummynet(&r, dir, kif, &m, &pd, fwa);
if (action == PF_DROP || m == NULL) {
*m0 = NULL;
return (action);
}
#endif
action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd,
&reason);
if (pd.lmw < 0)
goto done;
PF_APPLE_UPDATE_PDESC_IPv6();
if (action == PF_PASS) {
#if NPFSYNC
pfsync_update_state(s);
#endif
r = s->rule.ptr;
a = s->anchor.ptr;
log = s->log;
} else if (s == NULL)
action = pf_test_rule(&r, &s, dir, kif,
m, off, h, &pd, &a, &ruleset, &ip6intrq);
break;
}
case IPPROTO_ICMPV6: {
struct icmp6_hdr ih;
pd.hdr.icmp6 = &ih;
if (!pf_pull_hdr(m, off, &ih, sizeof (ih),
&action, &reason, AF_INET6)) {
log = action != PF_PASS;
goto done;
}
#if DUMMYNET
action = pf_test_dummynet(&r, dir, kif, &m, &pd, fwa);
if (action == PF_DROP || m == NULL) {
*m0 = NULL;
return (action);
}
#endif
action = pf_test_state_icmp(&s, dir, kif,
m, off, h, &pd, &reason);
if (pd.lmw < 0)
goto done;
PF_APPLE_UPDATE_PDESC_IPv6();
if (action == PF_PASS) {
#if NPFSYNC
pfsync_update_state(s);
#endif
r = s->rule.ptr;
a = s->anchor.ptr;
log = s->log;
} else if (s == NULL)
action = pf_test_rule(&r, &s, dir, kif,
m, off, h, &pd, &a, &ruleset, &ip6intrq);
break;
}
case IPPROTO_ESP: {
struct pf_esp_hdr esp;
pd.hdr.esp = &esp;
if (!pf_pull_hdr(m, off, &esp, sizeof (esp), &action, &reason,
AF_INET6)) {
log = action != PF_PASS;
goto done;
}
#if DUMMYNET
action = pf_test_dummynet(&r, dir, kif, &m, &pd, fwa);
if (action == PF_DROP || m == NULL) {
*m0 = NULL;
return (action);
}
#endif
action = pf_test_state_esp(&s, dir, kif, off, &pd);
if (pd.lmw < 0)
goto done;
PF_APPLE_UPDATE_PDESC_IPv6();
if (action == PF_PASS) {
#if NPFSYNC
pfsync_update_state(s);
#endif
r = s->rule.ptr;
a = s->anchor.ptr;
log = s->log;
} else if (s == NULL)
action = pf_test_rule(&r, &s, dir, kif,
m, off, h, &pd, &a, &ruleset, &ip6intrq);
break;
}
case IPPROTO_GRE: {
struct pf_grev1_hdr grev1;
pd.hdr.grev1 = &grev1;
if (!pf_pull_hdr(m, off, &grev1, sizeof (grev1), &action,
&reason, AF_INET6)) {
log = (action != PF_PASS);
goto done;
}
#if DUMMYNET
action = pf_test_dummynet(&r, dir, kif, &m, &pd, fwa);
if (action == PF_DROP || m == NULL) {
*m0 = NULL;
return (action);
}
#endif
if ((ntohs(grev1.flags) & PF_GRE_FLAG_VERSION_MASK) == 1 &&
ntohs(grev1.protocol_type) == PF_GRE_PPP_ETHERTYPE) {
if (ntohs(grev1.payload_length) >
m->m_pkthdr.len - off) {
action = PF_DROP;
REASON_SET(&reason, PFRES_SHORT);
goto done;
}
action = pf_test_state_grev1(&s, dir, kif, off, &pd);
if (pd.lmw < 0)
goto done;
PF_APPLE_UPDATE_PDESC_IPv6();
if (action == PF_PASS) {
#if NPFSYNC
pfsync_update_state(s);
#endif
r = s->rule.ptr;
a = s->anchor.ptr;
log = s->log;
break;
} else if (s == NULL) {
action = pf_test_rule(&r, &s, dir, kif, m, off,
h, &pd, &a, &ruleset, &ip6intrq);
if (action == PF_PASS)
break;
}
}
}
default:
#if DUMMYNET
action = pf_test_dummynet(&r, dir, kif, &m, &pd, fwa);
if (action == PF_DROP || m == NULL) {
*m0 = NULL;
return (action);
}
#endif
action = pf_test_state_other(&s, dir, kif, &pd);
if (pd.lmw < 0)
goto done;
PF_APPLE_UPDATE_PDESC_IPv6();
if (action == PF_PASS) {
#if NPFSYNC
pfsync_update_state(s);
#endif
r = s->rule.ptr;
a = s->anchor.ptr;
log = s->log;
} else if (s == NULL)
action = pf_test_rule(&r, &s, dir, kif, m, off, h,
&pd, &a, &ruleset, &ip6intrq);
break;
}
done:
*m0 = pd.mp;
PF_APPLE_UPDATE_PDESC_IPv6();
if (n != m) {
m_freem(n);
n = NULL;
}
if (action == PF_PASS && rh_cnt &&
!((s && s->allow_opts) || r->allow_opts)) {
action = PF_DROP;
REASON_SET(&reason, PFRES_IPOPTIONS);
log = 1;
DPFPRINTF(PF_DEBUG_MISC,
("pf: dropping packet with dangerous v6 headers\n"));
}
if ((s && s->tag) || PF_RTABLEID_IS_VALID(r->rtableid) || pd.flowhash != 0)
(void) pf_tag_packet(m, pd.pf_mtag, s ? s->tag : 0,
r->rtableid, &pd);
if (action == PF_PASS) {
#if PF_ALTQ
if (altq_allowed && r->qid) {
if (pd.tos & IPTOS_LOWDELAY)
pd.pf_mtag->pftag_qid = r->pqid;
else
pd.pf_mtag->pftag_qid = r->qid;
}
#endif
pd.pf_mtag->pftag_hdr = h;
pd.pf_mtag->pftag_flags &= ~PF_TAG_HDR_INET;
pd.pf_mtag->pftag_flags |= PF_TAG_HDR_INET6;
if (pd.proto == IPPROTO_TCP)
pd.pf_mtag->pftag_flags |= PF_TAG_TCP;
else
pd.pf_mtag->pftag_flags &= ~PF_TAG_TCP;
}
if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
(s->nat_rule.ptr->action == PF_RDR ||
s->nat_rule.ptr->action == PF_BINAT) &&
IN6_IS_ADDR_LOOPBACK(&pd.dst->v6))
pd.pf_mtag->pftag_flags |= PF_TAG_TRANSLATE_LOCALHOST;
if (log) {
struct pf_rule *lr;
if (s != NULL && s->nat_rule.ptr != NULL &&
s->nat_rule.ptr->log & PF_LOG_ALL)
lr = s->nat_rule.ptr;
else
lr = r;
PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset,
&pd);
}
kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
if (action == PF_PASS || r->action == PF_DROP) {
dirndx = (dir == PF_OUT);
r->packets[dirndx]++;
r->bytes[dirndx] += pd.tot_len;
if (a != NULL) {
a->packets[dirndx]++;
a->bytes[dirndx] += pd.tot_len;
}
if (s != NULL) {
sk = s->state_key;
if (s->nat_rule.ptr != NULL) {
s->nat_rule.ptr->packets[dirndx]++;
s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
}
if (s->src_node != NULL) {
s->src_node->packets[dirndx]++;
s->src_node->bytes[dirndx] += pd.tot_len;
}
if (s->nat_src_node != NULL) {
s->nat_src_node->packets[dirndx]++;
s->nat_src_node->bytes[dirndx] += pd.tot_len;
}
dirndx = (dir == sk->direction) ? 0 : 1;
s->packets[dirndx]++;
s->bytes[dirndx] += pd.tot_len;
}
tr = r;
nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
if (nr != NULL) {
struct pf_addr *x;
if (r == &pf_default_rule) {
tr = nr;
x = (s == NULL || sk->direction == dir) ?
&pd.baddr : &pd.naddr;
} else {
x = (s == NULL || sk->direction == dir) ?
&pd.naddr : &pd.baddr;
}
if (x == &pd.baddr || s == NULL) {
if (dir == PF_OUT)
pd.src = x;
else
pd.dst = x;
}
}
if (tr->src.addr.type == PF_ADDR_TABLE)
pfr_update_stats(tr->src.addr.p.tbl, (sk == NULL ||
sk->direction == dir) ? pd.src : pd.dst, pd.af,
pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
tr->src.neg);
if (tr->dst.addr.type == PF_ADDR_TABLE)
pfr_update_stats(tr->dst.addr.p.tbl, (sk == NULL ||
sk->direction == dir) ? pd.dst : pd.src, pd.af,
pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
tr->dst.neg);
}
#if 0
if (action == PF_SYNPROXY_DROP) {
m_freem(*m0);
*m0 = NULL;
action = PF_PASS;
} else if (r->rt)
pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd);
#else
VERIFY(m == NULL || pd.mp == NULL || pd.mp == m);
if (*m0) {
if (pd.lmw < 0) {
REASON_SET(&reason, PFRES_MEMORY);
action = PF_DROP;
}
if (action == PF_DROP) {
m_freem(*m0);
*m0 = NULL;
return (PF_DROP);
}
*m0 = m;
}
if (action == PF_SYNPROXY_DROP) {
m_freem(*m0);
*m0 = NULL;
action = PF_PASS;
} else if (r->rt) {
if (action == PF_PASS) {
m = *m0;
h = mtod(m, struct ip6_hdr *);
}
pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd);
}
#endif
return (action);
}
#endif
static int
pf_check_congestion(struct ifqueue *ifq)
{
#pragma unused(ifq)
return (0);
}
void
pool_init(struct pool *pp, size_t size, unsigned int align, unsigned int ioff,
int flags, const char *wchan, void *palloc)
{
#pragma unused(align, ioff, flags, palloc)
bzero(pp, sizeof (*pp));
pp->pool_zone = zinit(size, 1024 * size, PAGE_SIZE, wchan);
if (pp->pool_zone != NULL) {
zone_change(pp->pool_zone, Z_EXPAND, TRUE);
zone_change(pp->pool_zone, Z_CALLERACCT, FALSE);
pp->pool_hiwat = pp->pool_limit = (unsigned int)-1;
pp->pool_name = wchan;
}
}
void
pool_destroy(struct pool *pp)
{
#pragma unused(pp)
}
void
pool_sethiwat(struct pool *pp, int n)
{
pp->pool_hiwat = n;
}
void
pool_sethardlimit(struct pool *pp, int n, const char *warnmess, int ratecap)
{
#pragma unused(warnmess, ratecap)
pp->pool_limit = n;
}
void *
pool_get(struct pool *pp, int flags)
{
void *buf;
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
if (pp->pool_count > pp->pool_limit) {
DPFPRINTF(PF_DEBUG_NOISY,
("pf: pool %s hard limit reached (%d)\n",
pp->pool_name != NULL ? pp->pool_name : "unknown",
pp->pool_limit));
pp->pool_fails++;
return (NULL);
}
buf = zalloc_canblock(pp->pool_zone, (flags & (PR_NOWAIT | PR_WAITOK)));
if (buf != NULL) {
pp->pool_count++;
VERIFY(pp->pool_count != 0);
}
return (buf);
}
void
pool_put(struct pool *pp, void *v)
{
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
zfree(pp->pool_zone, v);
VERIFY(pp->pool_count != 0);
pp->pool_count--;
}
struct pf_mtag *
pf_find_mtag(struct mbuf *m)
{
if (!(m->m_flags & M_PKTHDR))
return (NULL);
return (m_pftag(m));
}
struct pf_mtag *
pf_get_mtag(struct mbuf *m)
{
return (pf_find_mtag(m));
}
uint64_t
pf_time_second(void)
{
struct timeval t;
microuptime(&t);
return (t.tv_sec);
}
uint64_t
pf_calendar_time_second(void)
{
struct timeval t;
microtime(&t);
return (t.tv_sec);
}
static void *
hook_establish(struct hook_desc_head *head, int tail, hook_fn_t fn, void *arg)
{
struct hook_desc *hd;
hd = _MALLOC(sizeof(*hd), M_DEVBUF, M_WAITOK);
if (hd == NULL)
return (NULL);
hd->hd_fn = fn;
hd->hd_arg = arg;
if (tail)
TAILQ_INSERT_TAIL(head, hd, hd_list);
else
TAILQ_INSERT_HEAD(head, hd, hd_list);
return (hd);
}
static void
hook_runloop(struct hook_desc_head *head, int flags)
{
struct hook_desc *hd;
if (!(flags & HOOK_REMOVE)) {
if (!(flags & HOOK_ABORT))
TAILQ_FOREACH(hd, head, hd_list)
hd->hd_fn(hd->hd_arg);
} else {
while (!!(hd = TAILQ_FIRST(head))) {
TAILQ_REMOVE(head, hd, hd_list);
if (!(flags & HOOK_ABORT))
hd->hd_fn(hd->hd_arg);
if (flags & HOOK_FREE)
_FREE(hd, M_DEVBUF);
}
}
}