#define _IP_VHL
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <kern/locks.h>
#include <sys/sysctl.h>
#include <machine/endian.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
#include <netinet/kpi_ipfilter_var.h>
#if CONFIG_MACF_NET
#include <security/mac_framework.h>
#endif
#include "faith.h"
#include <net/dlil.h>
#include <sys/kdebug.h>
#include <libkern/OSAtomic.h>
#define DBG_LAYER_BEG NETDBG_CODE(DBG_NETIP, 1)
#define DBG_LAYER_END NETDBG_CODE(DBG_NETIP, 3)
#define DBG_FNC_IP_OUTPUT NETDBG_CODE(DBG_NETIP, (1 << 8) | 1)
#define DBG_FNC_IPSEC4_OUTPUT NETDBG_CODE(DBG_NETIP, (2 << 8) | 1)
#define SWAP16(v) ((((v) & 0xff) << 8) | ((v) >> 8))
#if IPSEC
#include <netinet6/ipsec.h>
#include <netkey/key.h>
#if IPSEC_DEBUG
#include <netkey/key_debug.h>
#else
#define KEYDEBUG(lev,arg)
#endif
#endif
#include <netinet/ip_fw.h>
#include <netinet/ip_divert.h>
#if DUMMYNET
#include <netinet/ip_dummynet.h>
#endif
#if PF
#include <net/pfvar.h>
#endif
#if IPFIREWALL_FORWARD_DEBUG
#define print_ip(a) printf("%ld.%ld.%ld.%ld",(ntohl(a.s_addr)>>24)&0xFF,\
(ntohl(a.s_addr)>>16)&0xFF,\
(ntohl(a.s_addr)>>8)&0xFF,\
(ntohl(a.s_addr))&0xFF);
#endif
u_short ip_id;
static struct mbuf *ip_insertoptions(struct mbuf *, struct mbuf *, int *);
static struct ifnet *ip_multicast_if(struct in_addr *, int *);
static void ip_mloopback(struct ifnet *, struct mbuf *,
struct sockaddr_in *, int);
static int ip_getmoptions(struct sockopt *, struct ip_moptions *);
static int ip_pcbopts(int, struct mbuf **, struct mbuf *);
static int ip_setmoptions(struct sockopt *, struct ip_moptions **);
static void ip_out_cksum_stats(int, u_int32_t);
static struct ifaddr *in_selectsrcif(struct ip *, struct route *, unsigned int);
static void ip_bindif(struct inpcb *, unsigned int);
int ip_createmoptions(struct ip_moptions **imop);
int ip_addmembership(struct ip_moptions *imo, struct ip_mreq *mreq);
int ip_dropmembership(struct ip_moptions *imo, struct ip_mreq *mreq);
int ip_optcopy(struct ip *, struct ip *);
void in_delayed_cksum_offset(struct mbuf *, int );
void in_cksum_offset(struct mbuf* , size_t );
extern int (*fr_checkp)(struct ip *, int, struct ifnet *, int, struct mbuf **);
extern struct protosw inetsw[];
extern struct ip_linklocal_stat ip_linklocal_stat;
extern lck_mtx_t *ip_mutex;
#if IPSEC
extern int ipsec_bypass;
#endif
static int ip_maxchainsent = 0;
SYSCTL_INT(_net_inet_ip, OID_AUTO, maxchainsent, CTLFLAG_RW,
&ip_maxchainsent, 0, "use dlil_output_list");
#if DEBUG
static int forge_ce = 0;
SYSCTL_INT(_net_inet_ip, OID_AUTO, forge_ce, CTLFLAG_RW,
&forge_ce, 0, "Forge ECN CE");
#endif
static int ip_select_srcif_debug = 0;
SYSCTL_INT(_net_inet_ip, OID_AUTO, select_srcif_debug, CTLFLAG_RW,
&ip_select_srcif_debug, 0, "log source interface selection debug info");
int
ip_output(
struct mbuf *m0,
struct mbuf *opt,
struct route *ro,
int flags,
struct ip_moptions *imo,
struct ip_out_args *ipoa)
{
int error;
error = ip_output_list(m0, 0, opt, ro, flags, imo, ipoa);
return error;
}
int
ip_output_list(
struct mbuf *m0,
int packetchain,
struct mbuf *opt,
struct route *ro,
int flags,
struct ip_moptions *imo,
struct ip_out_args *ipoa
)
{
struct ip *ip;
struct ifnet *ifp = NULL;
struct mbuf *m = m0, **mppn = NULL;
int hlen = sizeof (struct ip);
int len = 0, off, error = 0;
struct sockaddr_in *dst = NULL;
struct in_ifaddr *ia = NULL, *src_ia = NULL;
int isbroadcast, sw_csum;
struct in_addr pkt_dst;
#if IPSEC
struct route iproute;
struct socket *so = NULL;
struct secpolicy *sp = NULL;
#endif
#if IPFIREWALL_FORWARD
int fwd_rewrite_src = 0;
#endif
#if IPFIREWALL
struct ip_fw_args args;
#endif
int didfilter = 0;
ipfilter_t inject_filter_ref = 0;
struct m_tag *tag;
struct route saved_route;
struct ip_out_args saved_ipoa;
struct mbuf * packetlist;
int pktcnt = 0, tso = 0;
unsigned int ifscope;
boolean_t select_srcif;
KERNEL_DEBUG(DBG_FNC_IP_OUTPUT | DBG_FUNC_START, 0,0,0,0,0);
packetlist = m0;
#if IPFIREWALL
args.next_hop = NULL;
args.eh = NULL;
args.rule = NULL;
args.divert_rule = 0;
args.ipoa = NULL;
if (SLIST_EMPTY(&m0->m_pkthdr.tags))
goto ipfw_tags_done;
#if DUMMYNET
if ((tag = m_tag_locate(m0, KERNEL_MODULE_TAG_ID,
KERNEL_TAG_TYPE_DUMMYNET, NULL)) != NULL) {
struct dn_pkt_tag *dn_tag;
dn_tag = (struct dn_pkt_tag *)(tag+1);
args.rule = dn_tag->rule;
opt = NULL;
saved_route = dn_tag->ro;
ro = &saved_route;
imo = NULL;
dst = dn_tag->dn_dst;
ifp = dn_tag->ifp;
flags = dn_tag->flags;
saved_ipoa = dn_tag->ipoa;
ipoa = &saved_ipoa;
m_tag_delete(m0, tag);
}
#endif
#if IPDIVERT
if ((tag = m_tag_locate(m0, KERNEL_MODULE_TAG_ID,
KERNEL_TAG_TYPE_DIVERT, NULL)) != NULL) {
struct divert_tag *div_tag;
div_tag = (struct divert_tag *)(tag+1);
args.divert_rule = div_tag->cookie;
m_tag_delete(m0, tag);
}
#endif
if ((tag = m_tag_locate(m0, KERNEL_MODULE_TAG_ID,
KERNEL_TAG_TYPE_IPFORWARD, NULL)) != NULL) {
struct ip_fwd_tag *ipfwd_tag;
ipfwd_tag = (struct ip_fwd_tag *)(tag+1);
args.next_hop = ipfwd_tag->next_hop;
m_tag_delete(m0, tag);
}
ipfw_tags_done:
#endif
m = m0;
#if DIAGNOSTIC
if ( !m || (m->m_flags & M_PKTHDR) != 0)
panic("ip_output no HDR");
if (!ro)
panic("ip_output no route, proto = %d",
mtod(m, struct ip *)->ip_p);
#endif
if (ip_doscopedroute && (flags & IP_OUTARGS)) {
select_srcif = !(flags & IP_FORWARDING);
ifscope = ipoa->ipoa_ifscope;
} else {
select_srcif = FALSE;
ifscope = IFSCOPE_NONE;
}
#if IPFIREWALL
if (args.rule != NULL) {
ip = mtod(m, struct ip *);
hlen = IP_VHL_HL(ip->ip_vhl) << 2 ;
if (ro->ro_rt != NULL) {
RT_LOCK_SPIN(ro->ro_rt);
ia = (struct in_ifaddr *)ro->ro_rt->rt_ifa;
if (ia)
ifaref(&ia->ia_ifa);
RT_UNLOCK(ro->ro_rt);
}
#if IPSEC
if (ipsec_bypass == 0 && (flags & IP_NOIPSEC) == 0) {
so = ipsec_getsocket(m);
(void)ipsec_setsocket(m, NULL);
}
#endif
goto sendit;
}
#endif
#if IPSEC
if (ipsec_bypass == 0 && (flags & IP_NOIPSEC) == 0) {
so = ipsec_getsocket(m);
(void)ipsec_setsocket(m, NULL);
}
#endif
loopit:
if (!SLIST_EMPTY(&m->m_pkthdr.tags))
inject_filter_ref = ipf_get_inject_filter(m);
else
inject_filter_ref = 0;
if (opt) {
m = ip_insertoptions(m, opt, &len);
hlen = len;
}
ip = mtod(m, struct ip *);
#if IPFIREWALL
pkt_dst = args.next_hop ? args.next_hop->sin_addr : ip->ip_dst;
#else
pkt_dst = ip->ip_dst;
#endif
if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
ip->ip_vhl = IP_MAKE_VHL(IPVERSION, hlen >> 2);
ip->ip_off &= IP_DF;
#if RANDOM_IP_ID
ip->ip_id = ip_randomid();
#else
ip->ip_id = htons(ip_id++);
#endif
OSAddAtomic(1, &ipstat.ips_localout);
} else {
hlen = IP_VHL_HL(ip->ip_vhl) << 2;
}
#if DEBUG
if (forge_ce != 0 &&
((ip->ip_tos & IPTOS_ECN_MASK) == IPTOS_ECN_ECT1 ||
(ip->ip_tos & IPTOS_ECN_MASK) == IPTOS_ECN_ECT0)) {
ip->ip_tos = (ip->ip_tos & ~IPTOS_ECN_MASK) | IPTOS_ECN_CE;
forge_ce--;
}
#endif
KERNEL_DEBUG(DBG_LAYER_BEG, ip->ip_dst.s_addr,
ip->ip_src.s_addr, ip->ip_p, ip->ip_off, ip->ip_len);
dst = (struct sockaddr_in *)&ro->ro_dst;
if (ro->ro_rt != NULL) {
if (ro->ro_rt->generation_id != route_generation &&
((flags & (IP_ROUTETOIF | IP_FORWARDING)) == 0) &&
(ip->ip_src.s_addr != INADDR_ANY)) {
src_ia = ifa_foraddr(ip->ip_src.s_addr);
if (src_ia == NULL) {
error = EADDRNOTAVAIL;
goto bad;
}
ifafree(&src_ia->ia_ifa);
}
if ((ro->ro_rt->rt_flags & RTF_UP) == 0 ||
dst->sin_family != AF_INET ||
dst->sin_addr.s_addr != pkt_dst.s_addr) {
rtfree(ro->ro_rt);
ro->ro_rt = NULL;
}
if (!select_srcif && ro->ro_rt != NULL &&
ro->ro_rt->generation_id != route_generation)
ro->ro_rt->generation_id = route_generation;
}
if (ro->ro_rt == NULL) {
bzero(dst, sizeof(*dst));
dst->sin_family = AF_INET;
dst->sin_len = sizeof(*dst);
dst->sin_addr = pkt_dst;
}
#define ifatoia(ifa) ((struct in_ifaddr *)(ifa))
#define sintosa(sin) ((struct sockaddr *)(sin))
if (flags & IP_ROUTETOIF) {
if (ia)
ifafree(&ia->ia_ifa);
if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst)))) == 0) {
if ((ia = ifatoia(ifa_ifwithnet(sintosa(dst)))) == 0) {
OSAddAtomic(1, &ipstat.ips_noroute);
error = ENETUNREACH;
goto bad;
}
}
ifp = ia->ia_ifp;
ip->ip_ttl = 1;
isbroadcast = in_broadcast(dst->sin_addr, ifp);
} else if (IN_MULTICAST(ntohl(pkt_dst.s_addr)) &&
imo != NULL && imo->imo_multicast_ifp != NULL) {
ifp = imo->imo_multicast_ifp;
isbroadcast = 0;
if (ia != NULL)
ifafree(&ia->ia_ifa);
IFP_TO_IA(ifp, ia);
} else {
boolean_t cloneok = FALSE;
if (select_srcif && ip->ip_src.s_addr != INADDR_ANY &&
(ro->ro_rt == NULL || !(ro->ro_rt->rt_flags & RTF_UP) ||
ro->ro_rt->generation_id != route_generation ||
!(ro->ro_flags & ROF_SRCIF_SELECTED))) {
struct ifaddr *ifa;
ifa = in_selectsrcif(ip, ro, ifscope);
if (ifa == NULL && !(flags & IP_RAWOUTPUT) &&
ifscope != lo_ifp->if_index) {
error = EADDRNOTAVAIL;
goto bad;
}
if (ifa != NULL) {
if (ifscope == IFSCOPE_NONE)
ifscope = ifa->ifa_ifp->if_index;
ifafree(ifa);
cloneok = (!(flags & IP_RAWOUTPUT) &&
!(IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr))));
}
}
if (ro->ro_rt == NULL) {
unsigned long ign = RTF_PRCLONING;
if (cloneok || dst->sin_addr.s_addr == INADDR_BROADCAST)
ign &= ~RTF_PRCLONING;
if (ifscope == lo_ifp->if_index)
rtalloc_ign(ro, ign);
else
rtalloc_scoped_ign(ro, ign, ifscope);
}
if (ro->ro_rt == NULL) {
OSAddAtomic(1, &ipstat.ips_noroute);
error = EHOSTUNREACH;
goto bad;
}
if (ia)
ifafree(&ia->ia_ifa);
RT_LOCK_SPIN(ro->ro_rt);
ia = ifatoia(ro->ro_rt->rt_ifa);
if (ia)
ifaref(&ia->ia_ifa);
ifp = ro->ro_rt->rt_ifp;
ro->ro_rt->rt_use++;
if (ro->ro_rt->rt_flags & RTF_GATEWAY)
dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
if (ro->ro_rt->rt_flags & RTF_HOST) {
isbroadcast = (ro->ro_rt->rt_flags & RTF_BROADCAST);
} else {
RT_CONVERT_LOCK(ro->ro_rt);
isbroadcast = in_broadcast(dst->sin_addr, ifp);
}
RT_UNLOCK(ro->ro_rt);
}
if (IN_MULTICAST(ntohl(pkt_dst.s_addr))) {
struct in_multi *inm;
m->m_flags |= M_MCAST;
dst = (struct sockaddr_in *)&ro->ro_dst;
if (imo != NULL) {
if ((flags & IP_RAWOUTPUT) == 0) ip->ip_ttl = imo->imo_multicast_ttl;
if (imo->imo_multicast_ifp != NULL) {
ifp = imo->imo_multicast_ifp;
}
#if MROUTING
if (imo->imo_multicast_vif != -1 &&
((flags & IP_RAWOUTPUT) == 0 || ip->ip_src.s_addr == INADDR_ANY))
ip->ip_src.s_addr =
ip_mcast_src(imo->imo_multicast_vif);
#endif
} else
if ((flags & IP_RAWOUTPUT) == 0) ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
if ((ifp->if_flags & IFF_MULTICAST) == 0) {
OSAddAtomic(1, &ipstat.ips_noroute);
error = ENETUNREACH;
goto bad;
}
}
if (ip->ip_src.s_addr == INADDR_ANY) {
struct in_ifaddr *ia1;
lck_rw_lock_shared(in_ifaddr_rwlock);
TAILQ_FOREACH(ia1, &in_ifaddrhead, ia_link)
if (ia1->ia_ifp == ifp) {
ip->ip_src = IA_SIN(ia1)->sin_addr;
break;
}
lck_rw_done(in_ifaddr_rwlock);
if (ip->ip_src.s_addr == INADDR_ANY) {
error = ENETUNREACH;
goto bad;
}
}
ifnet_lock_shared(ifp);
IN_LOOKUP_MULTI(pkt_dst, ifp, inm);
ifnet_lock_done(ifp);
if (inm != NULL &&
(imo == NULL || imo->imo_multicast_loop)) {
if (!TAILQ_EMPTY(&ipv4_filters)) {
struct ipfilter *filter;
int seen = (inject_filter_ref == 0);
struct ipf_pktopts *ippo = 0, ipf_pktopts;
if (imo) {
ippo = &ipf_pktopts;
ipf_pktopts.ippo_mcast_ifnet = imo->imo_multicast_ifp;
ipf_pktopts.ippo_mcast_ttl = imo->imo_multicast_ttl;
ipf_pktopts.ippo_mcast_loop = imo->imo_multicast_loop;
}
ipf_ref();
#if BYTE_ORDER != BIG_ENDIAN
HTONS(ip->ip_len);
HTONS(ip->ip_off);
#endif
TAILQ_FOREACH(filter, &ipv4_filters, ipf_link) {
if (seen == 0) {
if ((struct ipfilter *)inject_filter_ref == filter)
seen = 1;
} else if (filter->ipf_filter.ipf_output) {
errno_t result;
result = filter->ipf_filter.ipf_output(filter->ipf_filter.cookie, (mbuf_t*)&m, ippo);
if (result == EJUSTRETURN) {
ipf_unref();
goto done;
}
if (result != 0) {
ipf_unref();
goto bad;
}
}
}
ip = mtod(m, struct ip *);
#if BYTE_ORDER != BIG_ENDIAN
NTOHS(ip->ip_len);
NTOHS(ip->ip_off);
#endif
ipf_unref();
didfilter = 1;
}
ip_mloopback(ifp, m, dst, hlen);
}
#if MROUTING
else {
if (ip_mrouter && (flags & IP_FORWARDING) == 0) {
if (!rsvp_on)
imo = NULL;
if (ip_mforward(ip, ifp, m, imo) != 0) {
m_freem(m);
goto done;
}
}
}
#endif
if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
m_freem(m);
goto done;
}
goto sendit;
}
#ifndef notdef
if (ip->ip_src.s_addr == INADDR_ANY) {
ip->ip_src = IA_SIN(ia)->sin_addr;
#if IPFIREWALL_FORWARD
fwd_rewrite_src++;
#endif
}
#endif
if (isbroadcast) {
if ((ifp->if_flags & IFF_BROADCAST) == 0) {
error = EADDRNOTAVAIL;
goto bad;
}
if ((flags & IP_ALLOWBROADCAST) == 0) {
error = EACCES;
goto bad;
}
if ((u_short)ip->ip_len > ifp->if_mtu) {
error = EMSGSIZE;
goto bad;
}
m->m_flags |= M_BCAST;
} else {
m->m_flags &= ~M_BCAST;
}
sendit:
#if PF
if (pf_af_hook(ifp, mppn, &m, AF_INET, FALSE) != 0) {
if (packetlist == m0) {
packetlist = m;
mppn = NULL;
}
if (m != NULL) {
m0 = m;
goto loopit;
} else if (packetlist != NULL) {
goto sendchain;
}
goto done;
}
m0 = m;
ip = mtod(m, struct ip *);
pkt_dst = ip->ip_dst;
hlen = IP_VHL_HL(ip->ip_vhl) << 2;
#endif
if (IN_LINKLOCAL(ntohl(ip->ip_src.s_addr)) || IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr))) {
ip_linklocal_stat.iplls_out_total++;
if (ip->ip_ttl != MAXTTL) {
ip_linklocal_stat.iplls_out_badttl++;
ip->ip_ttl = MAXTTL;
}
}
if (!didfilter && !TAILQ_EMPTY(&ipv4_filters)) {
struct ipfilter *filter;
int seen = (inject_filter_ref == 0);
if (m->m_pkthdr.csum_flags & CSUM_TSO_IPV4) {
error = EMSGSIZE;
goto bad;
}
ipf_ref();
#if BYTE_ORDER != BIG_ENDIAN
HTONS(ip->ip_len);
HTONS(ip->ip_off);
#endif
TAILQ_FOREACH(filter, &ipv4_filters, ipf_link) {
if (seen == 0) {
if ((struct ipfilter *)inject_filter_ref == filter)
seen = 1;
} else if (filter->ipf_filter.ipf_output) {
errno_t result;
result = filter->ipf_filter.ipf_output(filter->ipf_filter.cookie, (mbuf_t*)&m, 0);
if (result == EJUSTRETURN) {
ipf_unref();
goto done;
}
if (result != 0) {
ipf_unref();
goto bad;
}
}
}
ip = mtod(m, struct ip *);
#if BYTE_ORDER != BIG_ENDIAN
NTOHS(ip->ip_len);
NTOHS(ip->ip_off);
#endif
ipf_unref();
}
#if IPSEC
if (ipsec_bypass != 0 || (flags & IP_NOIPSEC) != 0)
goto skip_ipsec;
KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_START, 0,0,0,0,0);
if (so == NULL)
sp = ipsec4_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, flags, &error);
else
sp = ipsec4_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error);
if (sp == NULL) {
IPSEC_STAT_INCREMENT(ipsecstat.out_inval);
KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 0,0,0,0,0);
goto bad;
}
error = 0;
switch (sp->policy) {
case IPSEC_POLICY_DISCARD:
case IPSEC_POLICY_GENERATE:
IPSEC_STAT_INCREMENT(ipsecstat.out_polvio);
KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 1,0,0,0,0);
goto bad;
case IPSEC_POLICY_BYPASS:
case IPSEC_POLICY_NONE:
KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 2,0,0,0,0);
goto skip_ipsec;
case IPSEC_POLICY_IPSEC:
if (sp->req == NULL) {
error = key_spdacquire(sp);
KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 3,0,0,0,0);
goto bad;
}
break;
case IPSEC_POLICY_ENTRUST:
default:
printf("ip_output: Invalid policy found. %d\n", sp->policy);
}
{
struct ipsec_output_state state;
bzero(&state, sizeof(state));
state.m = m;
if (flags & IP_ROUTETOIF) {
state.ro = &iproute;
bzero(&iproute, sizeof(iproute));
} else
state.ro = ro;
state.dst = (struct sockaddr *)dst;
ip->ip_sum = 0;
if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
in_delayed_cksum(m);
m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
}
#if BYTE_ORDER != BIG_ENDIAN
HTONS(ip->ip_len);
HTONS(ip->ip_off);
#endif
error = ipsec4_output(&state, sp, flags);
m0 = m = state.m;
if (flags & IP_ROUTETOIF) {
if (state.ro != &iproute || state.ro->ro_rt != NULL) {
flags &= ~IP_ROUTETOIF;
ro = state.ro;
}
} else
ro = state.ro;
dst = (struct sockaddr_in *)state.dst;
if (error) {
m0 = NULL;
switch (error) {
case EHOSTUNREACH:
case ENETUNREACH:
case EMSGSIZE:
case ENOBUFS:
case ENOMEM:
break;
default:
printf("ip4_output (ipsec): error code %d\n", error);
case ENOENT:
error = 0;
break;
}
KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 4,0,0,0,0);
goto bad;
}
}
ip = mtod(m, struct ip *);
#ifdef _IP_VHL
hlen = IP_VHL_HL(ip->ip_vhl) << 2;
#else
hlen = ip->ip_hl << 2;
#endif
if (ro->ro_rt != NULL && ro->ro_rt->generation_id != route_generation) {
if ((src_ia = ifa_foraddr(ip->ip_src.s_addr)) == NULL &&
((flags & (IP_ROUTETOIF | IP_FORWARDING)) == 0)) {
error = EADDRNOTAVAIL;
KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END,
5,0,0,0,0);
goto bad;
}
rtfree(ro->ro_rt);
ro->ro_rt = NULL;
if (src_ia != NULL)
ifafree(&src_ia->ia_ifa);
}
if (ro->ro_rt == NULL) {
if ((flags & IP_ROUTETOIF) == 0) {
printf("ip_output: can't update route after "
"IPsec processing\n");
error = EHOSTUNREACH;
KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END,
6,0,0,0,0);
goto bad;
}
} else {
if (ia)
ifafree(&ia->ia_ifa);
RT_LOCK_SPIN(ro->ro_rt);
ia = ifatoia(ro->ro_rt->rt_ifa);
if (ia)
ifaref(&ia->ia_ifa);
ifp = ro->ro_rt->rt_ifp;
RT_UNLOCK(ro->ro_rt);
}
#if BYTE_ORDER != BIG_ENDIAN
NTOHS(ip->ip_len);
NTOHS(ip->ip_off);
#endif
KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 7,0xff,0xff,0xff,0xff);
if (!TAILQ_EMPTY(&ipv4_filters)) {
struct ipfilter *filter;
if (m->m_pkthdr.csum_flags & CSUM_TSO_IPV4) {
error = EMSGSIZE;
goto bad;
}
ipf_ref();
#if BYTE_ORDER != BIG_ENDIAN
HTONS(ip->ip_len);
HTONS(ip->ip_off);
#endif
TAILQ_FOREACH(filter, &ipv4_filters, ipf_link) {
if (filter->ipf_filter.ipf_output) {
errno_t result;
result = filter->ipf_filter.ipf_output(filter->ipf_filter.cookie, (mbuf_t*)&m, 0);
if (result == EJUSTRETURN) {
ipf_unref();
goto done;
}
if (result != 0) {
ipf_unref();
goto bad;
}
}
}
ip = mtod(m, struct ip *);
#if BYTE_ORDER != BIG_ENDIAN
NTOHS(ip->ip_len);
NTOHS(ip->ip_off);
#endif
ipf_unref();
}
skip_ipsec:
#endif
#if IPFIREWALL
if (fr_checkp) {
struct mbuf *m1 = m;
if ((error = (*fr_checkp)(ip, hlen, ifp, 1, &m1)) || !m1) {
goto done;
}
ip = mtod(m0 = m = m1, struct ip *);
}
if (fw_enable && IPFW_LOADED && !args.next_hop) {
struct sockaddr_in *old = dst;
args.m = m;
args.next_hop = dst;
args.oif = ifp;
off = ip_fw_chk_ptr(&args);
m = args.m;
dst = args.next_hop;
m0 = m;
if ( (off & IP_FW_PORT_DENY_FLAG) || m == NULL) {
if (m)
m_freem(m);
error = EACCES ;
goto done ;
}
ip = mtod(m, struct ip *);
if (off == 0 && dst == old) {
goto pass ;
}
#if DUMMYNET
if (DUMMYNET_LOADED && (off & IP_FW_PORT_DYNT_FLAG) != 0) {
args.ro = ro;
args.dst = dst;
args.flags = flags;
if (flags & IP_OUTARGS)
args.ipoa = ipoa;
error = ip_dn_io_ptr(m, off & 0xffff, DN_TO_IP_OUT,
&args);
goto done;
}
#endif
#if IPDIVERT
if (off != 0 && (off & IP_FW_PORT_DYNT_FLAG) == 0) {
struct mbuf *clone = NULL;
if ((off & IP_FW_PORT_TEE_FLAG) != 0)
clone = m_dup(m, M_DONTWAIT);
if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
in_delayed_cksum(m);
m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
}
#if BYTE_ORDER != BIG_ENDIAN
HTONS(ip->ip_len);
HTONS(ip->ip_off);
#endif
divert_packet(m, 0, off & 0xffff, args.divert_rule);
if (clone != NULL) {
m0 = m = clone;
ip = mtod(m, struct ip *);
goto pass;
}
goto done;
}
#endif
#if IPFIREWALL_FORWARD
if (off == 0 && old != dst) {
struct in_ifaddr *ia_fw;
static struct route sro_fwd, *ro_fwd = &sro_fwd;
#if IPFIREWALL_FORWARD_DEBUG
printf("IPFIREWALL_FORWARD: New dst ip: ");
print_ip(dst->sin_addr);
printf("\n");
#endif
lck_rw_lock_shared(in_ifaddr_rwlock);
TAILQ_FOREACH(ia_fw, &in_ifaddrhead, ia_link) {
if (IA_SIN(ia_fw)->sin_addr.s_addr ==
dst->sin_addr.s_addr)
break;
}
lck_rw_done(in_ifaddr_rwlock);
if (ia_fw) {
struct m_tag *fwd_tag;
struct ip_fwd_tag *ipfwd_tag;
fwd_tag = m_tag_alloc(KERNEL_MODULE_TAG_ID,
KERNEL_TAG_TYPE_IPFORWARD,
sizeof (*ipfwd_tag), M_NOWAIT);
if (fwd_tag == NULL) {
error = ENOBUFS;
goto bad;
}
ipfwd_tag = (struct ip_fwd_tag *)(fwd_tag+1);
ipfwd_tag->next_hop = args.next_hop;
m_tag_prepend(m, fwd_tag);
if (m->m_pkthdr.rcvif == NULL)
m->m_pkthdr.rcvif = ifunit("lo0");
if ((~IF_HWASSIST_CSUM_FLAGS(m->m_pkthdr.rcvif->if_hwassist) &
m->m_pkthdr.csum_flags) == 0) {
if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
m->m_pkthdr.csum_flags |=
CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
m->m_pkthdr.csum_data = 0xffff;
}
m->m_pkthdr.csum_flags |=
CSUM_IP_CHECKED | CSUM_IP_VALID;
}
else if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
in_delayed_cksum(m);
m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
ip->ip_sum = in_cksum(m, hlen);
}
#if BYTE_ORDER != BIG_ENDIAN
HTONS(ip->ip_len);
HTONS(ip->ip_off);
#endif
if (lo_ifp) {
dlil_output(lo_ifp, PF_INET, m, 0, (struct sockaddr *)dst, 0);
}
else {
printf("ip_output: no loopback ifp for forwarding!!!\n");
}
goto done;
}
bcopy(dst, &ro_fwd->ro_dst, sizeof(*dst));
ro_fwd->ro_rt = NULL;
rtalloc_ign(ro_fwd, RTF_PRCLONING);
if (ro_fwd->ro_rt == NULL) {
OSAddAtomic(1, &ipstat.ips_noroute);
error = EHOSTUNREACH;
goto bad;
}
RT_LOCK_SPIN(ro_fwd->ro_rt);
ia_fw = ifatoia(ro_fwd->ro_rt->rt_ifa);
if (ia_fw != NULL)
ifaref(&ia_fw->ia_ifa);
ifp = ro_fwd->ro_rt->rt_ifp;
ro_fwd->ro_rt->rt_use++;
if (ro_fwd->ro_rt->rt_flags & RTF_GATEWAY)
dst = (struct sockaddr_in *)ro_fwd->ro_rt->rt_gateway;
if (ro_fwd->ro_rt->rt_flags & RTF_HOST) {
isbroadcast =
(ro_fwd->ro_rt->rt_flags & RTF_BROADCAST);
} else {
RT_CONVERT_LOCK(ro_fwd->ro_rt);
isbroadcast = in_broadcast(dst->sin_addr, ifp);
}
RT_UNLOCK(ro_fwd->ro_rt);
rtfree(ro->ro_rt);
ro->ro_rt = ro_fwd->ro_rt;
dst = (struct sockaddr_in *)&ro_fwd->ro_dst;
if (ia_fw != NULL) {
if (fwd_rewrite_src)
ip->ip_src = IA_SIN(ia_fw)->sin_addr;
ifafree(&ia_fw->ia_ifa);
}
goto pass ;
}
#endif
m_freem(m);
error = EACCES;
goto done;
}
#endif
pass:
#if __APPLE__
if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
((ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
(ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET)) {
OSAddAtomic(1, &ipstat.ips_badaddr);
m_freem(m);
error = ENETUNREACH;
goto done;
}
#endif
m->m_pkthdr.csum_flags |= CSUM_IP;
tso = (ifp->if_hwassist & IFNET_TSO_IPV4) && (m->m_pkthdr.csum_flags & CSUM_TSO_IPV4);
sw_csum = m->m_pkthdr.csum_flags
& ~IF_HWASSIST_CSUM_FLAGS(ifp->if_hwassist);
if ((ifp->if_hwassist & CSUM_TCP_SUM16) != 0) {
if (apple_hwcksum_tx && (m->m_pkthdr.csum_flags & CSUM_TCP)
&& (ip->ip_len > 50) && (ip->ip_len <= ifp->if_mtu)) {
u_short offset = (IP_VHL_HL(ip->ip_vhl) << 2) +14 ;
u_short csumprev= m->m_pkthdr.csum_data & 0xFFFF;
m->m_pkthdr.csum_flags = CSUM_DATA_VALID | CSUM_TCP_SUM16;
m->m_pkthdr.csum_data = (csumprev + offset) << 16 ;
m->m_pkthdr.csum_data += offset;
sw_csum = CSUM_DELAY_IP;
}
else {
sw_csum |= (CSUM_DELAY_DATA & m->m_pkthdr.csum_flags);
}
} else if (apple_hwcksum_tx == 0) {
sw_csum |= (CSUM_DELAY_DATA | CSUM_DELAY_IP) &
m->m_pkthdr.csum_flags;
}
if (sw_csum & CSUM_DELAY_DATA) {
in_delayed_cksum(m);
sw_csum &= ~CSUM_DELAY_DATA;
m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
}
if (apple_hwcksum_tx != 0) {
m->m_pkthdr.csum_flags &=
IF_HWASSIST_CSUM_FLAGS(ifp->if_hwassist);
} else {
m->m_pkthdr.csum_flags = 0;
}
if ((u_short)ip->ip_len <= ifp->if_mtu || tso ||
ifp->if_hwassist & CSUM_FRAGMENT) {
if (tso)
m->m_pkthdr.csum_flags |= CSUM_TSO_IPV4;
#if BYTE_ORDER != BIG_ENDIAN
HTONS(ip->ip_len);
HTONS(ip->ip_off);
#endif
ip->ip_sum = 0;
if (sw_csum & CSUM_DELAY_IP) {
ip->ip_sum = in_cksum(m, hlen);
}
#ifndef __APPLE__
if (!(flags & IP_FORWARDING) && ia != NULL) {
ia->ia_ifa.if_opackets++;
ia->ia_ifa.if_obytes += m->m_pkthdr.len;
}
#endif
#if IPSEC
if (ipsec_bypass == 0 && (flags & IP_NOIPSEC) == 0)
ipsec_delaux(m);
#endif
if (packetchain == 0) {
error = ifnet_output(ifp, PF_INET, m, ro->ro_rt,
(struct sockaddr *)dst);
goto done;
}
else {
mppn = &m->m_nextpkt;
m = m->m_nextpkt;
if (m == NULL) {
#if PF
sendchain:
#endif
if (pktcnt > ip_maxchainsent)
ip_maxchainsent = pktcnt;
error = ifnet_output(ifp, PF_INET, packetlist,
ro->ro_rt, (struct sockaddr *)dst);
pktcnt = 0;
goto done;
}
m0 = m;
pktcnt++;
goto loopit;
}
}
if (ip->ip_off & IP_DF || (m->m_pkthdr.csum_flags & CSUM_TSO_IPV4)) {
error = EMSGSIZE;
RT_LOCK_SPIN(ro->ro_rt);
if (ro->ro_rt && (ro->ro_rt->rt_flags & (RTF_UP | RTF_HOST))
&& !(ro->ro_rt->rt_rmx.rmx_locks & RTV_MTU)
&& (ro->ro_rt->rt_rmx.rmx_mtu > ifp->if_mtu)) {
ro->ro_rt->rt_rmx.rmx_mtu = ifp->if_mtu;
}
RT_UNLOCK(ro->ro_rt);
OSAddAtomic(1, &ipstat.ips_cantfrag);
goto bad;
}
error = ip_fragment(m, ifp, ifp->if_mtu, sw_csum);
if (error != 0) {
m0 = m = NULL;
goto bad;
}
KERNEL_DEBUG(DBG_LAYER_END, ip->ip_dst.s_addr,
ip->ip_src.s_addr, ip->ip_p, ip->ip_off, ip->ip_len);
for (m = m0; m; m = m0) {
m0 = m->m_nextpkt;
m->m_nextpkt = 0;
#if IPSEC
if (ipsec_bypass == 0 && (flags & IP_NOIPSEC) == 0)
ipsec_delaux(m);
#endif
if (error == 0) {
#ifndef __APPLE__
if (ia != NULL) {
ia->ia_ifa.if_opackets++;
ia->ia_ifa.if_obytes += m->m_pkthdr.len;
}
#endif
if ((packetchain != 0) && (pktcnt > 0))
panic("ip_output: mix of packet in packetlist is wrong=%p", packetlist);
error = ifnet_output(ifp, PF_INET, m, ro->ro_rt,
(struct sockaddr *)dst);
} else
m_freem(m);
}
if (error == 0)
OSAddAtomic(1, &ipstat.ips_fragmented);
done:
if (ia) {
ifafree(&ia->ia_ifa);
ia = NULL;
}
#if IPSEC
if (ipsec_bypass == 0 && (flags & IP_NOIPSEC) == 0) {
if (ro == &iproute && ro->ro_rt) {
rtfree(ro->ro_rt);
ro->ro_rt = NULL;
}
if (sp != NULL) {
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ip_output call free SP:%x\n", sp));
key_freesp(sp, KEY_SADB_UNLOCKED);
}
}
#endif
KERNEL_DEBUG(DBG_FNC_IP_OUTPUT | DBG_FUNC_END, error,0,0,0,0);
return (error);
bad:
m_freem(m0);
goto done;
}
int
ip_fragment(struct mbuf *m, struct ifnet *ifp, unsigned long mtu, int sw_csum)
{
struct ip *ip, *mhip;
int len, hlen, mhlen, firstlen, off, error = 0;
struct mbuf **mnext = &m->m_nextpkt, *m0;
int nfrags = 1;
ip = mtod(m, struct ip *);
#ifdef _IP_VHL
hlen = IP_VHL_HL(ip->ip_vhl) << 2;
#else
hlen = ip->ip_hl << 2;
#endif
firstlen = len = (mtu - hlen) &~ 7;
if (len < 8) {
m_freem(m);
return (EMSGSIZE);
}
if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA &&
(ifp->if_hwassist & CSUM_IP_FRAGS) == 0) {
in_delayed_cksum(m);
m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
}
m0 = m;
mhlen = sizeof (struct ip);
for (off = hlen + len; off < (u_short)ip->ip_len; off += len) {
MGETHDR(m, M_DONTWAIT, MT_HEADER);
if (m == 0) {
error = ENOBUFS;
OSAddAtomic(1, &ipstat.ips_odropped);
goto sendorfree;
}
m->m_flags |= (m0->m_flags & M_MCAST) | M_FRAG;
m->m_data += max_linkhdr;
mhip = mtod(m, struct ip *);
*mhip = *ip;
if (hlen > sizeof (struct ip)) {
mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
mhip->ip_vhl = IP_MAKE_VHL(IPVERSION, mhlen >> 2);
}
m->m_len = mhlen;
mhip->ip_off = ((off - hlen) >> 3) + (ip->ip_off & ~IP_MF);
if (ip->ip_off & IP_MF)
mhip->ip_off |= IP_MF;
if (off + len >= (u_short)ip->ip_len)
len = (u_short)ip->ip_len - off;
else
mhip->ip_off |= IP_MF;
mhip->ip_len = htons((u_short)(len + mhlen));
m->m_next = m_copy(m0, off, len);
if (m->m_next == 0) {
(void) m_free(m);
error = ENOBUFS;
OSAddAtomic(1, &ipstat.ips_odropped);
goto sendorfree;
}
m->m_pkthdr.len = mhlen + len;
m->m_pkthdr.rcvif = 0;
m->m_pkthdr.csum_flags = m0->m_pkthdr.csum_flags;
m->m_pkthdr.socket_id = m0->m_pkthdr.socket_id;
#if CONFIG_MACF_NET
mac_netinet_fragment(m0, m);
#endif
#if BYTE_ORDER != BIG_ENDIAN
HTONS(mhip->ip_off);
#endif
mhip->ip_sum = 0;
if (sw_csum & CSUM_DELAY_IP) {
mhip->ip_sum = in_cksum(m, mhlen);
}
*mnext = m;
mnext = &m->m_nextpkt;
nfrags++;
}
OSAddAtomic(nfrags, &ipstat.ips_ofragments);
m->m_flags |= M_LASTFRAG;
m0->m_flags |= M_FIRSTFRAG | M_FRAG;
m0->m_pkthdr.csum_data = nfrags;
m = m0;
m_adj(m, hlen + firstlen - (u_short)ip->ip_len);
m->m_pkthdr.len = hlen + firstlen;
ip->ip_len = htons((u_short)m->m_pkthdr.len);
ip->ip_off |= IP_MF;
#if BYTE_ORDER != BIG_ENDIAN
HTONS(ip->ip_off);
#endif
ip->ip_sum = 0;
if (sw_csum & CSUM_DELAY_IP) {
ip->ip_sum = in_cksum(m, hlen);
}
sendorfree:
if (error)
m_freem_list(m0);
return (error);
}
static void
ip_out_cksum_stats(int proto, u_int32_t len)
{
switch (proto) {
case IPPROTO_TCP:
tcp_out_cksum_stats(len);
break;
case IPPROTO_UDP:
udp_out_cksum_stats(len);
break;
default:
break;
}
}
void
in_delayed_cksum_offset(struct mbuf *m0, int ip_offset)
{
struct ip *ip;
unsigned char buf[sizeof(struct ip)];
u_short csum, offset, ip_len;
struct mbuf *m = m0;
while (ip_offset >= m->m_len) {
ip_offset -= m->m_len;
m = m->m_next;
if (m == NULL) {
printf("in_delayed_cksum_withoffset failed - ip_offset wasn't in the packet\n");
return;
}
}
if (ip_offset + sizeof(struct ip) > m->m_len) {
#if DEBUG
printf("delayed m_pullup, m->len: %d off: %d\n",
m->m_len, ip_offset);
#endif
m_copydata(m, ip_offset, sizeof(struct ip), (caddr_t) buf);
ip = (struct ip *)buf;
} else {
ip = (struct ip*)(m->m_data + ip_offset);
}
if (ip_offset) {
m->m_len -= ip_offset;
m->m_data += ip_offset;
}
offset = IP_VHL_HL(ip->ip_vhl) << 2 ;
ip_len = ip->ip_len;
if (ip_len != (m0->m_pkthdr.len - ip_offset)) {
ip_len = SWAP16(ip_len);
if (ip_len != (m0->m_pkthdr.len - ip_offset)) {
printf("in_delayed_cksum_offset: ip_len %d (%d) "
"doesn't match actual length %d\n", ip->ip_len,
ip_len, (m0->m_pkthdr.len - ip_offset));
return;
}
}
csum = in_cksum_skip(m, ip_len, offset);
ip_out_cksum_stats(ip->ip_p, ip_len - offset);
if (m0->m_pkthdr.csum_flags & CSUM_UDP && csum == 0)
csum = 0xffff;
offset += m0->m_pkthdr.csum_data & 0xFFFF;
if (ip_offset) {
if (M_LEADINGSPACE(m) < ip_offset)
panic("in_delayed_cksum_offset - chain modified!\n");
m->m_len += ip_offset;
m->m_data -= ip_offset;
}
if (offset > ip_len)
return;
if (offset + ip_offset + sizeof(u_short) > m->m_len) {
char tmp[2];
#if DEBUG
printf("delayed m_copyback, m->len: %d off: %d p: %d\n",
m->m_len, offset + ip_offset, ip->ip_p);
#endif
*(u_short *)tmp = csum;
m_copyback(m, offset + ip_offset, 2, tmp);
} else
*(u_short *)(m->m_data + offset + ip_offset) = csum;
}
void
in_delayed_cksum(struct mbuf *m)
{
in_delayed_cksum_offset(m, 0);
}
void
in_cksum_offset(struct mbuf* m, size_t ip_offset)
{
struct ip* ip = NULL;
int hlen = 0;
unsigned char buf[sizeof(struct ip)];
int swapped = 0;
while (ip_offset >= m->m_len) {
ip_offset -= m->m_len;
m = m->m_next;
if (m == NULL) {
printf("in_cksum_offset failed - ip_offset wasn't in the packet\n");
return;
}
}
if (ip_offset + sizeof(struct ip) > m->m_len) {
#if DEBUG
printf("in_cksum_offset - delayed m_pullup, m->len: %d off: %lu\n",
m->m_len, ip_offset);
#endif
m_copydata(m, ip_offset, sizeof(struct ip), (caddr_t) buf);
ip = (struct ip *)buf;
ip->ip_sum = 0;
m_copyback(m, ip_offset + offsetof(struct ip, ip_sum), 2, (caddr_t)&ip->ip_sum);
} else {
ip = (struct ip*)(m->m_data + ip_offset);
ip->ip_sum = 0;
}
if (ip_offset) {
m->m_len -= ip_offset;
m->m_data += ip_offset;
}
#ifdef _IP_VHL
hlen = IP_VHL_HL(ip->ip_vhl) << 2;
#else
hlen = ip->ip_hl << 2;
#endif
if (ntohs(ip->ip_len) != (m->m_pkthdr.len - ip_offset)) {
ip->ip_len = SWAP16(ip->ip_len);
swapped = 1;
if (ntohs(ip->ip_len) != (m->m_pkthdr.len - ip_offset)) {
ip->ip_len = SWAP16(ip->ip_len);
printf("in_cksum_offset: ip_len %d (%d) "
"doesn't match actual length %lu\n",
ip->ip_len, SWAP16(ip->ip_len),
(m->m_pkthdr.len - ip_offset));
return;
}
}
ip->ip_sum = 0;
ip->ip_sum = in_cksum(m, hlen);
if (swapped)
ip->ip_len = SWAP16(ip->ip_len);
if (ip_offset) {
if (M_LEADINGSPACE(m) < ip_offset)
panic("in_cksum_offset - chain modified!\n");
m->m_len += ip_offset;
m->m_data -= ip_offset;
}
if (ip_offset + sizeof(struct ip) > m->m_len) {
char tmp[2];
#if DEBUG
printf("in_cksum_offset m_copyback, m->len: %u off: %lu p: %d\n",
m->m_len, ip_offset + offsetof(struct ip, ip_sum), ip->ip_p);
#endif
*(u_short *)tmp = ip->ip_sum;
m_copyback(m, ip_offset + offsetof(struct ip, ip_sum), 2, tmp);
}
}
static struct mbuf *
ip_insertoptions(m, opt, phlen)
register struct mbuf *m;
struct mbuf *opt;
int *phlen;
{
register struct ipoption *p = mtod(opt, struct ipoption *);
struct mbuf *n;
register struct ip *ip = mtod(m, struct ip *);
unsigned optlen;
optlen = opt->m_len - sizeof(p->ipopt_dst);
if (optlen + (u_short)ip->ip_len > IP_MAXPACKET)
return (m);
if (p->ipopt_dst.s_addr)
ip->ip_dst = p->ipopt_dst;
if (m->m_flags & M_EXT || m->m_data - optlen < m->m_pktdat) {
MGETHDR(n, M_DONTWAIT, MT_HEADER);
if (n == 0)
return (m);
n->m_pkthdr.rcvif = 0;
#if CONFIG_MACF_NET
mac_mbuf_label_copy(m, n);
#endif
n->m_pkthdr.len = m->m_pkthdr.len + optlen;
m->m_len -= sizeof(struct ip);
m->m_data += sizeof(struct ip);
n->m_next = m;
m = n;
m->m_len = optlen + sizeof(struct ip);
m->m_data += max_linkhdr;
(void)memcpy(mtod(m, void *), ip, sizeof(struct ip));
} else {
m->m_data -= optlen;
m->m_len += optlen;
m->m_pkthdr.len += optlen;
ovbcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip));
}
ip = mtod(m, struct ip *);
bcopy(p->ipopt_list, ip + 1, optlen);
*phlen = sizeof(struct ip) + optlen;
ip->ip_vhl = IP_MAKE_VHL(IPVERSION, *phlen >> 2);
ip->ip_len += optlen;
return (m);
}
int
ip_optcopy(ip, jp)
struct ip *ip, *jp;
{
register u_char *cp, *dp;
int opt, optlen, cnt;
cp = (u_char *)(ip + 1);
dp = (u_char *)(jp + 1);
cnt = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof (struct ip);
for (; cnt > 0; cnt -= optlen, cp += optlen) {
opt = cp[0];
if (opt == IPOPT_EOL)
break;
if (opt == IPOPT_NOP) {
*dp++ = IPOPT_NOP;
optlen = 1;
continue;
}
#if DIAGNOSTIC
if (cnt < IPOPT_OLEN + sizeof(*cp))
panic("malformed IPv4 option passed to ip_optcopy");
#endif
optlen = cp[IPOPT_OLEN];
#if DIAGNOSTIC
if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt)
panic("malformed IPv4 option passed to ip_optcopy");
#endif
if (optlen > cnt)
optlen = cnt;
if (IPOPT_COPIED(opt)) {
bcopy(cp, dp, optlen);
dp += optlen;
}
}
for (optlen = dp - (u_char *)(jp+1); optlen & 0x3; optlen++)
*dp++ = IPOPT_EOL;
return (optlen);
}
int
ip_ctloutput(so, sopt)
struct socket *so;
struct sockopt *sopt;
{
struct inpcb *inp = sotoinpcb(so);
int error, optval;
error = optval = 0;
if (sopt->sopt_level != IPPROTO_IP) {
return (EINVAL);
}
switch (sopt->sopt_dir) {
case SOPT_SET:
switch (sopt->sopt_name) {
case IP_OPTIONS:
#ifdef notyet
case IP_RETOPTS:
#endif
{
struct mbuf *m;
if (sopt->sopt_valsize > MLEN) {
error = EMSGSIZE;
break;
}
MGET(m, sopt->sopt_p != kernproc ? M_WAIT : M_DONTWAIT,
MT_HEADER);
if (m == 0) {
error = ENOBUFS;
break;
}
m->m_len = sopt->sopt_valsize;
error = sooptcopyin(sopt, mtod(m, char *), m->m_len,
m->m_len);
if (error)
break;
return (ip_pcbopts(sopt->sopt_name, &inp->inp_options,
m));
}
case IP_TOS:
case IP_TTL:
case IP_RECVOPTS:
case IP_RECVRETOPTS:
case IP_RECVDSTADDR:
case IP_RECVIF:
case IP_RECVTTL:
#if defined(NFAITH) && NFAITH > 0
case IP_FAITH:
#endif
error = sooptcopyin(sopt, &optval, sizeof optval,
sizeof optval);
if (error)
break;
switch (sopt->sopt_name) {
case IP_TOS:
inp->inp_ip_tos = optval;
break;
case IP_TTL:
inp->inp_ip_ttl = optval;
break;
#define OPTSET(bit) \
if (optval) \
inp->inp_flags |= bit; \
else \
inp->inp_flags &= ~bit;
case IP_RECVOPTS:
OPTSET(INP_RECVOPTS);
break;
case IP_RECVRETOPTS:
OPTSET(INP_RECVRETOPTS);
break;
case IP_RECVDSTADDR:
OPTSET(INP_RECVDSTADDR);
break;
case IP_RECVIF:
OPTSET(INP_RECVIF);
break;
case IP_RECVTTL:
OPTSET(INP_RECVTTL);
break;
#if defined(NFAITH) && NFAITH > 0
case IP_FAITH:
OPTSET(INP_FAITH);
break;
#endif
}
break;
#undef OPTSET
#if CONFIG_FORCE_OUT_IFP
case IP_FORCE_OUT_IFP: {
char ifname[IFNAMSIZ];
unsigned int ifscope;
if (!(inp->inp_vflag & INP_IPV4)) {
error = EINVAL;
break;
}
if (sopt->sopt_valsize > sizeof(ifname)) {
error = EINVAL;
break;
}
if (sopt->sopt_valsize != 0) {
error = sooptcopyin(sopt, ifname,
sizeof (ifname), sopt->sopt_valsize);
if (error)
break;
}
if (sopt->sopt_valsize == 0 || ifname[0] == NULL) {
ifscope = IFSCOPE_NONE;
} else {
ifnet_t ifp;
if (ifname[sopt->sopt_valsize - 1] != NULL) {
error = EINVAL;
break;
}
if (ifnet_find_by_name(ifname, &ifp) != 0) {
error = ENXIO;
break;
}
ifscope = ifp->if_index;
ifnet_release(ifp);
}
ip_bindif(inp, ifscope);
}
break;
#endif
case IP_MULTICAST_IF:
case IP_MULTICAST_VIF:
case IP_MULTICAST_TTL:
case IP_MULTICAST_LOOP:
case IP_ADD_MEMBERSHIP:
case IP_DROP_MEMBERSHIP:
error = ip_setmoptions(sopt, &inp->inp_moptions);
break;
case IP_PORTRANGE:
error = sooptcopyin(sopt, &optval, sizeof optval,
sizeof optval);
if (error)
break;
switch (optval) {
case IP_PORTRANGE_DEFAULT:
inp->inp_flags &= ~(INP_LOWPORT);
inp->inp_flags &= ~(INP_HIGHPORT);
break;
case IP_PORTRANGE_HIGH:
inp->inp_flags &= ~(INP_LOWPORT);
inp->inp_flags |= INP_HIGHPORT;
break;
case IP_PORTRANGE_LOW:
inp->inp_flags &= ~(INP_HIGHPORT);
inp->inp_flags |= INP_LOWPORT;
break;
default:
error = EINVAL;
break;
}
break;
#if IPSEC
case IP_IPSEC_POLICY:
{
caddr_t req = NULL;
size_t len = 0;
int priv;
struct mbuf *m;
int optname;
if (sopt->sopt_valsize > MCLBYTES) {
error = EMSGSIZE;
break;
}
if ((error = soopt_getm(sopt, &m)) != 0)
break;
if ((error = soopt_mcopyin(sopt, m)) != 0)
break;
priv = (proc_suser(sopt->sopt_p) == 0);
if (m) {
req = mtod(m, caddr_t);
len = m->m_len;
}
optname = sopt->sopt_name;
error = ipsec4_set_policy(inp, optname, req, len, priv);
m_freem(m);
break;
}
#endif
#if TRAFFIC_MGT
case IP_TRAFFIC_MGT_BACKGROUND:
{
unsigned background = 0;
error = sooptcopyin(sopt, &background, sizeof(background), sizeof(background));
if (error)
break;
if (background) {
socket_set_traffic_mgt_flags(so,
TRAFFIC_MGT_SO_BACKGROUND |
TRAFFIC_MGT_SO_BG_REGULATE);
} else {
socket_clear_traffic_mgt_flags(so,
TRAFFIC_MGT_SO_BACKGROUND |
TRAFFIC_MGT_SO_BG_REGULATE);
}
break;
}
#endif
case IP_BOUND_IF:
if (!(inp->inp_vflag & INP_IPV4)) {
error = EINVAL;
break;
}
error = sooptcopyin(sopt, &optval, sizeof (optval),
sizeof (optval));
if (error)
break;
ip_bindif(inp, optval);
break;
default:
error = ENOPROTOOPT;
break;
}
break;
case SOPT_GET:
switch (sopt->sopt_name) {
case IP_OPTIONS:
case IP_RETOPTS:
if (inp->inp_options)
error = sooptcopyout(sopt,
mtod(inp->inp_options,
char *),
inp->inp_options->m_len);
else
sopt->sopt_valsize = 0;
break;
case IP_TOS:
case IP_TTL:
case IP_RECVOPTS:
case IP_RECVRETOPTS:
case IP_RECVDSTADDR:
case IP_RECVIF:
case IP_RECVTTL:
case IP_PORTRANGE:
#if defined(NFAITH) && NFAITH > 0
case IP_FAITH:
#endif
switch (sopt->sopt_name) {
case IP_TOS:
optval = inp->inp_ip_tos;
break;
case IP_TTL:
optval = inp->inp_ip_ttl;
break;
#define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0)
case IP_RECVOPTS:
optval = OPTBIT(INP_RECVOPTS);
break;
case IP_RECVRETOPTS:
optval = OPTBIT(INP_RECVRETOPTS);
break;
case IP_RECVDSTADDR:
optval = OPTBIT(INP_RECVDSTADDR);
break;
case IP_RECVIF:
optval = OPTBIT(INP_RECVIF);
break;
case IP_RECVTTL:
optval = OPTBIT(INP_RECVTTL);
break;
case IP_PORTRANGE:
if (inp->inp_flags & INP_HIGHPORT)
optval = IP_PORTRANGE_HIGH;
else if (inp->inp_flags & INP_LOWPORT)
optval = IP_PORTRANGE_LOW;
else
optval = 0;
break;
#if defined(NFAITH) && NFAITH > 0
case IP_FAITH:
optval = OPTBIT(INP_FAITH);
break;
#endif
}
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
case IP_MULTICAST_IF:
case IP_MULTICAST_VIF:
case IP_MULTICAST_TTL:
case IP_MULTICAST_LOOP:
case IP_ADD_MEMBERSHIP:
case IP_DROP_MEMBERSHIP:
error = ip_getmoptions(sopt, inp->inp_moptions);
break;
#if IPSEC
case IP_IPSEC_POLICY:
{
struct mbuf *m = NULL;
caddr_t req = NULL;
size_t len = 0;
if (m != 0) {
req = mtod(m, caddr_t);
len = m->m_len;
}
error = ipsec4_get_policy(sotoinpcb(so), req, len, &m);
if (error == 0)
error = soopt_mcopyout(sopt, m);
if (error == 0)
m_freem(m);
break;
}
#endif
#if TRAFFIC_MGT
case IP_TRAFFIC_MGT_BACKGROUND:
{
unsigned background = so->so_traffic_mgt_flags;
return (sooptcopyout(sopt, &background, sizeof(background)));
break;
}
#endif
case IP_BOUND_IF:
if (inp->inp_flags & INP_BOUND_IF)
optval = inp->inp_boundif;
error = sooptcopyout(sopt, &optval, sizeof (optval));
break;
default:
error = ENOPROTOOPT;
break;
}
break;
}
return (error);
}
static int
ip_pcbopts(
__unused int optname,
struct mbuf **pcbopt,
register struct mbuf *m)
{
register int cnt, optlen;
register u_char *cp;
u_char opt;
if (*pcbopt)
(void)m_free(*pcbopt);
*pcbopt = 0;
if (m == (struct mbuf *)0 || m->m_len == 0) {
if (m)
(void)m_free(m);
return (0);
}
#ifndef vax
if (m->m_len % sizeof(int32_t))
goto bad;
#endif
if (m->m_data + m->m_len + sizeof(struct in_addr) >= &m->m_dat[MLEN])
goto bad;
cnt = m->m_len;
m->m_len += sizeof(struct in_addr);
cp = mtod(m, u_char *) + sizeof(struct in_addr);
ovbcopy(mtod(m, caddr_t), (caddr_t)cp, (unsigned)cnt);
bzero(mtod(m, caddr_t), sizeof(struct in_addr));
for (; cnt > 0; cnt -= optlen, cp += optlen) {
opt = cp[IPOPT_OPTVAL];
if (opt == IPOPT_EOL)
break;
if (opt == IPOPT_NOP)
optlen = 1;
else {
if (cnt < IPOPT_OLEN + sizeof(*cp))
goto bad;
optlen = cp[IPOPT_OLEN];
if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt)
goto bad;
}
switch (opt) {
default:
break;
case IPOPT_LSRR:
case IPOPT_SSRR:
if (optlen < IPOPT_MINOFF - 1 + sizeof(struct in_addr))
goto bad;
m->m_len -= sizeof(struct in_addr);
cnt -= sizeof(struct in_addr);
optlen -= sizeof(struct in_addr);
cp[IPOPT_OLEN] = optlen;
bcopy((caddr_t)&cp[IPOPT_OFFSET+1], mtod(m, caddr_t),
sizeof(struct in_addr));
ovbcopy((caddr_t)(&cp[IPOPT_OFFSET+1] +
sizeof(struct in_addr)),
(caddr_t)&cp[IPOPT_OFFSET+1],
(unsigned)cnt + sizeof(struct in_addr));
break;
}
}
if (m->m_len > MAX_IPOPTLEN + sizeof(struct in_addr))
goto bad;
*pcbopt = m;
return (0);
bad:
(void)m_free(m);
return (EINVAL);
}
static struct ifnet *
ip_multicast_if(a, ifindexp)
struct in_addr *a;
int *ifindexp;
{
int ifindex;
struct ifnet *ifp;
if (ifindexp)
*ifindexp = 0;
if (ntohl(a->s_addr) >> 24 == 0) {
ifindex = ntohl(a->s_addr) & 0xffffff;
ifnet_head_lock_shared();
if (ifindex < 0 || if_index < ifindex) {
ifnet_head_done();
return NULL;
}
ifp = ifindex2ifnet[ifindex];
ifnet_head_done();
if (ifindexp)
*ifindexp = ifindex;
} else {
INADDR_TO_IFP(*a, ifp);
}
return ifp;
}
static int
ip_setmoptions(sopt, imop)
struct sockopt *sopt;
struct ip_moptions **imop;
{
int error = 0;
struct in_addr addr;
struct ip_mreq mreq;
struct ifnet *ifp = NULL;
struct ip_moptions *imo = *imop;
int ifindex;
if (imo == NULL) {
error = ip_createmoptions(imop);
if (error != 0)
return error;
imo = *imop;
}
switch (sopt->sopt_name) {
#if MROUTING
case IP_MULTICAST_VIF:
{
int i;
if (legal_vif_num == 0) {
error = EOPNOTSUPP;
break;
}
error = sooptcopyin(sopt, &i, sizeof i, sizeof i);
if (error)
break;
if (!legal_vif_num(i) && (i != -1)) {
error = EINVAL;
break;
}
imo->imo_multicast_vif = i;
break;
}
#endif
case IP_MULTICAST_IF:
error = sooptcopyin(sopt, &addr, sizeof addr, sizeof addr);
if (error)
break;
if (addr.s_addr == INADDR_ANY) {
imo->imo_multicast_ifp = NULL;
break;
}
ifp = ip_multicast_if(&addr, &ifindex);
if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
error = EADDRNOTAVAIL;
break;
}
imo->imo_multicast_ifp = ifp;
if (ifindex)
imo->imo_multicast_addr = addr;
else
imo->imo_multicast_addr.s_addr = INADDR_ANY;
break;
case IP_MULTICAST_TTL:
if (sopt->sopt_valsize == 1) {
u_char ttl;
error = sooptcopyin(sopt, &ttl, 1, 1);
if (error)
break;
imo->imo_multicast_ttl = ttl;
} else {
u_int ttl;
error = sooptcopyin(sopt, &ttl, sizeof ttl,
sizeof ttl);
if (error)
break;
if (ttl > 255)
error = EINVAL;
else
imo->imo_multicast_ttl = ttl;
}
break;
case IP_MULTICAST_LOOP:
if (sopt->sopt_valsize == 1) {
u_char loop;
error = sooptcopyin(sopt, &loop, 1, 1);
if (error)
break;
imo->imo_multicast_loop = !!loop;
} else {
u_int loop;
error = sooptcopyin(sopt, &loop, sizeof loop,
sizeof loop);
if (error)
break;
imo->imo_multicast_loop = !!loop;
}
break;
case IP_ADD_MEMBERSHIP:
error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq);
if (error)
break;
error = ip_addmembership(imo, &mreq);
break;
case IP_DROP_MEMBERSHIP:
error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq);
if (error)
break;
error = ip_dropmembership(imo, &mreq);
break;
default:
error = EOPNOTSUPP;
break;
}
if (imo->imo_multicast_ifp == NULL &&
imo->imo_multicast_vif == (u_int32_t)-1 &&
imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL &&
imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP &&
imo->imo_num_memberships == 0) {
FREE(*imop, M_IPMOPTS);
*imop = NULL;
}
return (error);
}
__private_extern__ int
ip_createmoptions(
struct ip_moptions **imop)
{
struct ip_moptions *imo;
imo = (struct ip_moptions*) _MALLOC(sizeof(*imo), M_IPMOPTS,
M_WAITOK);
if (imo == NULL)
return (ENOBUFS);
*imop = imo;
imo->imo_multicast_ifp = NULL;
imo->imo_multicast_addr.s_addr = INADDR_ANY;
imo->imo_multicast_vif = -1;
imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP;
imo->imo_num_memberships = 0;
return 0;
}
__private_extern__ int
ip_addmembership(
struct ip_moptions *imo,
struct ip_mreq *mreq)
{
struct route ro;
struct sockaddr_in *dst;
struct ifnet *ifp = NULL;
int error = 0;
int i;
bzero((caddr_t)&ro, sizeof(ro));
if (!IN_MULTICAST(ntohl(mreq->imr_multiaddr.s_addr))) {
error = EINVAL;
goto done;
}
if (mreq->imr_interface.s_addr == INADDR_ANY) {
dst = (struct sockaddr_in *)&ro.ro_dst;
dst->sin_len = sizeof(*dst);
dst->sin_family = AF_INET;
dst->sin_addr = mreq->imr_multiaddr;
rtalloc_ign(&ro, 0);
if (ro.ro_rt != NULL) {
ifp = ro.ro_rt->rt_ifp;
} else {
mreq->imr_interface.s_addr = htonl(INADDR_LOOPBACK);
}
}
if (ifp == NULL) {
ifp = ip_multicast_if(&mreq->imr_interface, NULL);
}
if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
error = EADDRNOTAVAIL;
goto done;
}
for (i = 0; i < imo->imo_num_memberships; ++i) {
if (imo->imo_membership[i]->inm_ifp == ifp &&
imo->imo_membership[i]->inm_addr.s_addr
== mreq->imr_multiaddr.s_addr)
break;
}
if (i < imo->imo_num_memberships) {
error = EADDRINUSE;
goto done;
}
if (i == IP_MAX_MEMBERSHIPS) {
error = ETOOMANYREFS;
goto done;
}
if ((imo->imo_membership[i] =
in_addmulti(&mreq->imr_multiaddr, ifp)) == NULL) {
error = ENOBUFS;
goto done;
}
++imo->imo_num_memberships;
done:
if (ro.ro_rt != NULL)
rtfree(ro.ro_rt);
return error;
}
__private_extern__ int
ip_dropmembership(
struct ip_moptions *imo,
struct ip_mreq *mreq)
{
int error = 0;
struct ifnet* ifp = NULL;
int i;
if (!IN_MULTICAST(ntohl(mreq->imr_multiaddr.s_addr))) {
error = EINVAL;
return error;
}
if (mreq->imr_interface.s_addr == INADDR_ANY)
ifp = NULL;
else {
ifp = ip_multicast_if(&mreq->imr_interface, NULL);
if (ifp == NULL) {
error = EADDRNOTAVAIL;
return error;
}
}
for (i = 0; i < imo->imo_num_memberships; ++i) {
if ((ifp == NULL ||
imo->imo_membership[i]->inm_ifp == ifp) &&
imo->imo_membership[i]->inm_addr.s_addr ==
mreq->imr_multiaddr.s_addr)
break;
}
if (i == imo->imo_num_memberships) {
error = EADDRNOTAVAIL;
return error;
}
in_delmulti(&imo->imo_membership[i]);
for (++i; i < imo->imo_num_memberships; ++i)
imo->imo_membership[i-1] = imo->imo_membership[i];
--imo->imo_num_memberships;
return error;
}
static int
ip_getmoptions(sopt, imo)
struct sockopt *sopt;
register struct ip_moptions *imo;
{
struct in_addr addr;
struct in_ifaddr *ia;
int error, optval;
u_char coptval;
error = 0;
switch (sopt->sopt_name) {
#if MROUTING
case IP_MULTICAST_VIF:
if (imo != NULL)
optval = imo->imo_multicast_vif;
else
optval = -1;
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
#endif
case IP_MULTICAST_IF:
if (imo == NULL || imo->imo_multicast_ifp == NULL)
addr.s_addr = INADDR_ANY;
else if (imo->imo_multicast_addr.s_addr) {
addr = imo->imo_multicast_addr;
} else {
IFP_TO_IA(imo->imo_multicast_ifp, ia);
addr.s_addr = (ia == NULL) ? INADDR_ANY
: IA_SIN(ia)->sin_addr.s_addr;
if (ia != NULL)
ifafree(&ia->ia_ifa);
}
error = sooptcopyout(sopt, &addr, sizeof addr);
break;
case IP_MULTICAST_TTL:
if (imo == 0)
optval = coptval = IP_DEFAULT_MULTICAST_TTL;
else
optval = coptval = imo->imo_multicast_ttl;
if (sopt->sopt_valsize == 1)
error = sooptcopyout(sopt, &coptval, 1);
else
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
case IP_MULTICAST_LOOP:
if (imo == 0)
optval = coptval = IP_DEFAULT_MULTICAST_LOOP;
else
optval = coptval = imo->imo_multicast_loop;
if (sopt->sopt_valsize == 1)
error = sooptcopyout(sopt, &coptval, 1);
else
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
default:
error = ENOPROTOOPT;
break;
}
return (error);
}
void
ip_freemoptions(imo)
register struct ip_moptions *imo;
{
register int i;
if (imo != NULL) {
for (i = 0; i < imo->imo_num_memberships; ++i)
in_delmulti(&imo->imo_membership[i]);
FREE(imo, M_IPMOPTS);
}
}
static void
ip_mloopback(ifp, m, dst, hlen)
struct ifnet *ifp;
register struct mbuf *m;
register struct sockaddr_in *dst;
int hlen;
{
register struct ip *ip;
struct mbuf *copym;
int sw_csum = (apple_hwcksum_tx == 0);
copym = m_copy(m, 0, M_COPYALL);
if (copym != NULL && (copym->m_flags & M_EXT || copym->m_len < hlen))
copym = m_pullup(copym, hlen);
if (copym == NULL)
return;
ip = mtod(copym, struct ip *);
#if BYTE_ORDER != BIG_ENDIAN
HTONS(ip->ip_len);
HTONS(ip->ip_off);
#endif
ip->ip_sum = 0;
ip->ip_sum = in_cksum(copym, hlen);
#if 1
if (dst->sin_family != AF_INET) {
printf("ip_mloopback: bad address family %d\n",
dst->sin_family);
dst->sin_family = AF_INET;
}
#endif
if (sw_csum || (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA)) {
if (!sw_csum && IF_HWASSIST_CSUM_FLAGS(ifp->if_hwassist)) {
copym->m_pkthdr.csum_flags |=
CSUM_DATA_VALID | CSUM_PSEUDO_HDR |
CSUM_IP_CHECKED | CSUM_IP_VALID;
copym->m_pkthdr.csum_data = 0xffff;
} else {
#if BYTE_ORDER != BIG_ENDIAN
NTOHS(ip->ip_len);
#endif
in_delayed_cksum(copym);
#if BYTE_ORDER != BIG_ENDIAN
HTONS(ip->ip_len);
#endif
}
}
if (lo_ifp) {
copym->m_pkthdr.rcvif = ifp;
dlil_output(lo_ifp, PF_INET, copym, 0,
(struct sockaddr *) dst, 0);
} else {
printf("Warning: ip_output call to dlil_find_dltag failed!\n");
m_freem(copym);
}
}
static struct ifaddr *
in_selectsrcif(struct ip *ip, struct route *ro, unsigned int ifscope)
{
struct ifaddr *ifa = NULL;
struct in_addr src = ip->ip_src;
struct in_addr dst = ip->ip_dst;
struct ifnet *rt_ifp;
char s_src[MAX_IPv4_STR_LEN], s_dst[MAX_IPv4_STR_LEN];
if (ip_select_srcif_debug) {
(void) inet_ntop(AF_INET, &src.s_addr, s_src, sizeof (s_src));
(void) inet_ntop(AF_INET, &dst.s_addr, s_dst, sizeof (s_dst));
}
if (ro->ro_rt != NULL)
RT_LOCK(ro->ro_rt);
rt_ifp = (ro->ro_rt != NULL) ? ro->ro_rt->rt_ifp : NULL;
if (ifscope != IFSCOPE_NONE || ro->ro_rt != NULL) {
unsigned int scope = ifscope;
if (scope == IFSCOPE_NONE) {
scope = rt_ifp->if_index;
if (scope != get_primary_ifscope() &&
ro->ro_rt->generation_id != route_generation)
scope = get_primary_ifscope();
}
ifa = (struct ifaddr *)ifa_foraddr_scoped(src.s_addr, scope);
if (ifa == NULL && ip->ip_p != IPPROTO_UDP &&
ip->ip_p != IPPROTO_TCP && ipforwarding) {
ifa = (struct ifaddr *)ifa_foraddr(src.s_addr);
if (ifa != NULL) {
ifafree(ifa);
ifa = NULL;
ifscope = IFSCOPE_NONE;
}
}
if (ip_select_srcif_debug && ifa != NULL) {
if (ro->ro_rt != NULL) {
printf("%s->%s ifscope %d->%d ifa_if %s%d "
"ro_if %s%d\n", s_src, s_dst, ifscope,
scope, ifa->ifa_ifp->if_name,
ifa->ifa_ifp->if_unit, rt_ifp->if_name,
rt_ifp->if_unit);
} else {
printf("%s->%s ifscope %d->%d ifa_if %s%d\n",
s_src, s_dst, ifscope, scope,
ifa->ifa_ifp->if_name,
ifa->ifa_ifp->if_unit);
}
}
}
if (ifa == NULL && ifscope == IFSCOPE_NONE) {
ifa = (struct ifaddr *)ifa_foraddr(src.s_addr);
if (ifa != NULL && ro->ro_rt == NULL) {
struct rtentry *rt;
struct sockaddr_in sin;
struct ifaddr *oifa = NULL;
bzero(&sin, sizeof (sin));
sin.sin_family = AF_INET;
sin.sin_len = sizeof (sin);
sin.sin_addr = dst;
lck_mtx_lock(rnh_lock);
if ((rt = rt_lookup(TRUE, (struct sockaddr *)&sin, NULL,
rt_tables[AF_INET], IFSCOPE_NONE)) != NULL) {
RT_LOCK(rt);
if (ifa->ifa_ifp != rt->rt_ifp) {
oifa = ifa;
ifa = rt->rt_ifa;
ifaref(ifa);
RT_UNLOCK(rt);
} else {
RT_UNLOCK(rt);
}
rtfree_locked(rt);
}
lck_mtx_unlock(rnh_lock);
if (oifa != NULL) {
struct ifaddr *iifa;
iifa = (struct ifaddr *)ifa_foraddr_scoped(
src.s_addr, ifa->ifa_ifp->if_index);
if (iifa != NULL) {
ifafree(oifa);
ifafree(ifa);
ifa = iifa;
} else if (!ipforwarding ||
(rt->rt_flags & RTF_GATEWAY)) {
ifafree(ifa);
ifa = oifa;
} else {
ifafree(oifa);
}
}
} else if (ifa != NULL && ro->ro_rt != NULL &&
!(ro->ro_rt->rt_flags & RTF_GATEWAY) &&
ifa->ifa_ifp != ro->ro_rt->rt_ifp && ipforwarding) {
ifafree(ifa);
ifa = ro->ro_rt->rt_ifa;
ifaref(ifa);
}
if (ip_select_srcif_debug && ifa != NULL) {
printf("%s->%s ifscope %d ifa_if %s%d\n",
s_src, s_dst, ifscope, ifa->ifa_ifp->if_name,
ifa->ifa_ifp->if_unit);
}
}
if (ro->ro_rt != NULL)
RT_LOCK_ASSERT_HELD(ro->ro_rt);
if (ro->ro_rt != NULL &&
(ifa == NULL || (ifa->ifa_ifp != rt_ifp && rt_ifp != lo_ifp) ||
!(ro->ro_rt->rt_flags & RTF_UP))) {
if (ip_select_srcif_debug) {
if (ifa != NULL) {
printf("%s->%s ifscope %d ro_if %s%d != "
"ifa_if %s%d (cached route cleared)\n",
s_src, s_dst, ifscope, rt_ifp->if_name,
rt_ifp->if_unit, ifa->ifa_ifp->if_name,
ifa->ifa_ifp->if_unit);
} else {
printf("%s->%s ifscope %d ro_if %s%d "
"(no ifa_if found)\n",
s_src, s_dst, ifscope, rt_ifp->if_name,
rt_ifp->if_unit);
}
}
RT_UNLOCK(ro->ro_rt);
rtfree(ro->ro_rt);
ro->ro_rt = NULL;
ro->ro_flags &= ~ROF_SRCIF_SELECTED;
if (IN_LINKLOCAL(ntohl(dst.s_addr)) &&
!IN_LINKLOCAL(ntohl(src.s_addr)) && ifa != NULL) {
ifafree(ifa);
ifa = NULL;
}
}
if (ip_select_srcif_debug && ifa == NULL) {
printf("%s->%s ifscope %d (neither ro_if/ifa_if found)\n",
s_src, s_dst, ifscope);
}
if (ro->ro_rt != NULL && (!IN_LINKLOCAL(ntohl(dst.s_addr)) ||
(ro->ro_rt->rt_gateway->sa_family == AF_LINK &&
SDL(ro->ro_rt->rt_gateway)->sdl_alen != 0))) {
ro->ro_flags |= ROF_SRCIF_SELECTED;
ro->ro_rt->generation_id = route_generation;
}
if (ro->ro_rt != NULL)
RT_UNLOCK(ro->ro_rt);
return (ifa);
}
static void
ip_bindif(struct inpcb *inp, unsigned int ifscope)
{
inp->inp_boundif = ifscope;
if (inp->inp_boundif == IFSCOPE_NONE)
inp->inp_flags &= ~INP_BOUND_IF;
else
inp->inp_flags |= INP_BOUND_IF;
if (inp->inp_route.ro_rt != NULL) {
rtfree(inp->inp_route.ro_rt);
inp->inp_route.ro_rt = NULL;
}
}