#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/malloc.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/if_var.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#if INET6
#include <netinet/ip6.h>
#endif
#include <net/pfvar.h>
struct pfi_kif *pfi_all = NULL;
static struct pool pfi_addr_pl;
static struct pfi_ifhead pfi_ifs;
static u_int32_t pfi_update = 1;
static struct pfr_addr *pfi_buffer;
static int pfi_buffer_cnt;
static int pfi_buffer_max;
__private_extern__ void pfi_kifaddr_update(void *);
static void pfi_kif_update(struct pfi_kif *);
static void pfi_dynaddr_update(struct pfi_dynaddr *dyn);
static void pfi_table_update(struct pfr_ktable *, struct pfi_kif *, int, int);
static void pfi_instance_add(struct ifnet *, int, int);
static void pfi_address_add(struct sockaddr *, int, int);
static int pfi_if_compare(struct pfi_kif *, struct pfi_kif *);
static int pfi_skip_if(const char *, struct pfi_kif *);
static int pfi_unmask(void *);
RB_PROTOTYPE_SC(static, pfi_ifhead, pfi_kif, pfik_tree, pfi_if_compare);
RB_GENERATE(pfi_ifhead, pfi_kif, pfik_tree, pfi_if_compare);
#define PFI_BUFFER_MAX 0x10000
#define PFI_MTYPE M_IFADDR
#define IFG_ALL "ALL"
void
pfi_initialize(void)
{
if (pfi_all != NULL)
return;
pool_init(&pfi_addr_pl, sizeof (struct pfi_dynaddr), 0, 0, 0,
"pfiaddrpl", NULL);
pfi_buffer_max = 64;
pfi_buffer = _MALLOC(pfi_buffer_max * sizeof (*pfi_buffer),
PFI_MTYPE, M_WAITOK);
if ((pfi_all = pfi_kif_get(IFG_ALL)) == NULL)
panic("pfi_kif_get for pfi_all failed");
}
#if 0
void
pfi_destroy(void)
{
pool_destroy(&pfi_addr_pl);
_FREE(pfi_buffer, PFI_MTYPE);
}
#endif
struct pfi_kif *
pfi_kif_get(const char *kif_name)
{
struct pfi_kif *kif;
struct pfi_kif_cmp s;
bzero(&s, sizeof (s));
strlcpy(s.pfik_name, kif_name, sizeof (s.pfik_name));
if ((kif = RB_FIND(pfi_ifhead, &pfi_ifs, (struct pfi_kif *)&s)) != NULL)
return (kif);
if ((kif = _MALLOC(sizeof (*kif), PFI_MTYPE, M_WAITOK|M_ZERO)) == NULL)
return (NULL);
strlcpy(kif->pfik_name, kif_name, sizeof (kif->pfik_name));
kif->pfik_tzero = pf_time_second();
TAILQ_INIT(&kif->pfik_dynaddrs);
RB_INSERT(pfi_ifhead, &pfi_ifs, kif);
return (kif);
}
void
pfi_kif_ref(struct pfi_kif *kif, enum pfi_kif_refs what)
{
switch (what) {
case PFI_KIF_REF_RULE:
kif->pfik_rules++;
break;
case PFI_KIF_REF_STATE:
kif->pfik_states++;
break;
default:
panic("pfi_kif_ref with unknown type");
}
}
void
pfi_kif_unref(struct pfi_kif *kif, enum pfi_kif_refs what)
{
if (kif == NULL)
return;
switch (what) {
case PFI_KIF_REF_NONE:
break;
case PFI_KIF_REF_RULE:
if (kif->pfik_rules <= 0) {
printf("pfi_kif_unref: rules refcount <= 0\n");
return;
}
kif->pfik_rules--;
break;
case PFI_KIF_REF_STATE:
if (kif->pfik_states <= 0) {
printf("pfi_kif_unref: state refcount <= 0\n");
return;
}
kif->pfik_states--;
break;
default:
panic("pfi_kif_unref with unknown type");
}
if (kif->pfik_ifp != NULL || kif == pfi_all)
return;
if (kif->pfik_rules || kif->pfik_states)
return;
RB_REMOVE(pfi_ifhead, &pfi_ifs, kif);
_FREE(kif, PFI_MTYPE);
}
int
pfi_kif_match(struct pfi_kif *rule_kif, struct pfi_kif *packet_kif)
{
if (rule_kif == NULL || rule_kif == packet_kif)
return (1);
return (0);
}
void
pfi_attach_ifnet(struct ifnet *ifp)
{
struct pfi_kif *kif;
char if_name[IFNAMSIZ];
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
pfi_update++;
(void) snprintf(if_name, sizeof (if_name), "%s%d",
ifp->if_name, ifp->if_unit);
if ((kif = pfi_kif_get(if_name)) == NULL)
panic("pfi_kif_get failed");
ifnet_lock_exclusive(ifp);
kif->pfik_ifp = ifp;
ifp->if_pf_kif = kif;
ifnet_lock_done(ifp);
pfi_kif_update(kif);
}
void
pfi_detach_ifnet(struct ifnet *ifp)
{
struct pfi_kif *kif;
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
if ((kif = (struct pfi_kif *)ifp->if_pf_kif) == NULL)
return;
pfi_update++;
pfi_kif_update(kif);
ifnet_lock_exclusive(ifp);
kif->pfik_ifp = NULL;
ifp->if_pf_kif = NULL;
ifnet_lock_done(ifp);
pfi_kif_unref(kif, PFI_KIF_REF_NONE);
}
int
pfi_match_addr(struct pfi_dynaddr *dyn, struct pf_addr *a, sa_family_t af)
{
switch (af) {
#if INET
case AF_INET:
switch (dyn->pfid_acnt4) {
case 0:
return (0);
case 1:
return (PF_MATCHA(0, &dyn->pfid_addr4,
&dyn->pfid_mask4, a, AF_INET));
default:
return (pfr_match_addr(dyn->pfid_kt, a, AF_INET));
}
break;
#endif
#if INET6
case AF_INET6:
switch (dyn->pfid_acnt6) {
case 0:
return (0);
case 1:
return (PF_MATCHA(0, &dyn->pfid_addr6,
&dyn->pfid_mask6, a, AF_INET6));
default:
return (pfr_match_addr(dyn->pfid_kt, a, AF_INET6));
}
break;
#endif
default:
return (0);
}
}
int
pfi_dynaddr_setup(struct pf_addr_wrap *aw, sa_family_t af)
{
struct pfi_dynaddr *dyn;
char tblname[PF_TABLE_NAME_SIZE];
struct pf_ruleset *ruleset = NULL;
int rv = 0;
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
if (aw->type != PF_ADDR_DYNIFTL)
return (0);
if ((dyn = pool_get(&pfi_addr_pl, PR_WAITOK)) == NULL)
return (1);
bzero(dyn, sizeof (*dyn));
if (strcmp(aw->v.ifname, "self") == 0)
dyn->pfid_kif = pfi_kif_get(IFG_ALL);
else
dyn->pfid_kif = pfi_kif_get(aw->v.ifname);
if (dyn->pfid_kif == NULL) {
rv = 1;
goto _bad;
}
pfi_kif_ref(dyn->pfid_kif, PFI_KIF_REF_RULE);
dyn->pfid_net = pfi_unmask(&aw->v.a.mask);
if (af == AF_INET && dyn->pfid_net == 32)
dyn->pfid_net = 128;
strlcpy(tblname, aw->v.ifname, sizeof (tblname));
if (aw->iflags & PFI_AFLAG_NETWORK)
strlcat(tblname, ":network", sizeof (tblname));
if (aw->iflags & PFI_AFLAG_BROADCAST)
strlcat(tblname, ":broadcast", sizeof (tblname));
if (aw->iflags & PFI_AFLAG_PEER)
strlcat(tblname, ":peer", sizeof (tblname));
if (aw->iflags & PFI_AFLAG_NOALIAS)
strlcat(tblname, ":0", sizeof (tblname));
if (dyn->pfid_net != 128)
snprintf(tblname + strlen(tblname),
sizeof (tblname) - strlen(tblname), "/%d", dyn->pfid_net);
if ((ruleset = pf_find_or_create_ruleset(PF_RESERVED_ANCHOR)) == NULL) {
rv = 1;
goto _bad;
}
if ((dyn->pfid_kt = pfr_attach_table(ruleset, tblname)) == NULL) {
rv = 1;
goto _bad;
}
dyn->pfid_kt->pfrkt_flags |= PFR_TFLAG_ACTIVE;
dyn->pfid_iflags = aw->iflags;
dyn->pfid_af = af;
TAILQ_INSERT_TAIL(&dyn->pfid_kif->pfik_dynaddrs, dyn, entry);
aw->p.dyn = dyn;
pfi_kif_update(dyn->pfid_kif);
return (0);
_bad:
if (dyn->pfid_kt != NULL)
pfr_detach_table(dyn->pfid_kt);
if (ruleset != NULL)
pf_remove_if_empty_ruleset(ruleset);
if (dyn->pfid_kif != NULL)
pfi_kif_unref(dyn->pfid_kif, PFI_KIF_REF_RULE);
pool_put(&pfi_addr_pl, dyn);
return (rv);
}
void
pfi_kif_update(struct pfi_kif *kif)
{
struct pfi_dynaddr *p;
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
TAILQ_FOREACH(p, &kif->pfik_dynaddrs, entry)
pfi_dynaddr_update(p);
}
void
pfi_dynaddr_update(struct pfi_dynaddr *dyn)
{
struct pfi_kif *kif;
struct pfr_ktable *kt;
if (dyn == NULL || dyn->pfid_kif == NULL || dyn->pfid_kt == NULL)
panic("pfi_dynaddr_update");
kif = dyn->pfid_kif;
kt = dyn->pfid_kt;
if (kt->pfrkt_larg != pfi_update) {
pfi_table_update(kt, kif, dyn->pfid_net, dyn->pfid_iflags);
kt->pfrkt_larg = pfi_update;
}
pfr_dynaddr_update(kt, dyn);
}
void
pfi_table_update(struct pfr_ktable *kt, struct pfi_kif *kif, int net, int flags)
{
int e, size2 = 0;
pfi_buffer_cnt = 0;
if (kif->pfik_ifp != NULL)
pfi_instance_add(kif->pfik_ifp, net, flags);
if ((e = pfr_set_addrs(&kt->pfrkt_t, pfi_buffer, pfi_buffer_cnt, &size2,
NULL, NULL, NULL, 0, PFR_TFLAG_ALLMASK)))
printf("pfi_table_update: cannot set %d new addresses "
"into table %s: %d\n", pfi_buffer_cnt, kt->pfrkt_name, e);
}
void
pfi_instance_add(struct ifnet *ifp, int net, int flags)
{
struct ifaddr *ia;
int got4 = 0, got6 = 0;
int net2, af;
if (ifp == NULL)
return;
ifnet_lock_shared(ifp);
TAILQ_FOREACH(ia, &ifp->if_addrhead, ifa_link) {
if (ia->ifa_addr == NULL)
continue;
af = ia->ifa_addr->sa_family;
if (af != AF_INET && af != AF_INET6)
continue;
if ((flags & PFI_AFLAG_BROADCAST) && af == AF_INET6)
continue;
if ((flags & PFI_AFLAG_BROADCAST) &&
!(ifp->if_flags & IFF_BROADCAST))
continue;
if ((flags & PFI_AFLAG_PEER) &&
!(ifp->if_flags & IFF_POINTOPOINT))
continue;
if ((flags & PFI_AFLAG_NETWORK) && af == AF_INET6 &&
IN6_IS_ADDR_LINKLOCAL(
&((struct sockaddr_in6 *)ia->ifa_addr)->sin6_addr))
continue;
if (flags & PFI_AFLAG_NOALIAS) {
if (af == AF_INET && got4)
continue;
if (af == AF_INET6 && got6)
continue;
}
if (af == AF_INET)
got4 = 1;
else if (af == AF_INET6)
got6 = 1;
net2 = net;
if (net2 == 128 && (flags & PFI_AFLAG_NETWORK)) {
if (af == AF_INET)
net2 = pfi_unmask(&((struct sockaddr_in *)
ia->ifa_netmask)->sin_addr);
else if (af == AF_INET6)
net2 = pfi_unmask(&((struct sockaddr_in6 *)
ia->ifa_netmask)->sin6_addr);
}
if (af == AF_INET && net2 > 32)
net2 = 32;
if (flags & PFI_AFLAG_BROADCAST)
pfi_address_add(ia->ifa_broadaddr, af, net2);
else if (flags & PFI_AFLAG_PEER)
pfi_address_add(ia->ifa_dstaddr, af, net2);
else
pfi_address_add(ia->ifa_addr, af, net2);
}
ifnet_lock_done(ifp);
}
void
pfi_address_add(struct sockaddr *sa, int af, int net)
{
struct pfr_addr *p;
int i;
if (pfi_buffer_cnt >= pfi_buffer_max) {
int new_max = pfi_buffer_max * 2;
if (new_max > PFI_BUFFER_MAX) {
printf("pfi_address_add: address buffer full (%d/%d)\n",
pfi_buffer_cnt, PFI_BUFFER_MAX);
return;
}
p = _MALLOC(new_max * sizeof (*pfi_buffer), PFI_MTYPE,
M_WAITOK);
if (p == NULL) {
printf("pfi_address_add: no memory to grow buffer "
"(%d/%d)\n", pfi_buffer_cnt, PFI_BUFFER_MAX);
return;
}
memcpy(pfi_buffer, p, pfi_buffer_cnt * sizeof (*pfi_buffer));
_FREE(pfi_buffer, PFI_MTYPE);
pfi_buffer = p;
pfi_buffer_max = new_max;
}
if (af == AF_INET && net > 32)
net = 128;
p = pfi_buffer + pfi_buffer_cnt++;
bzero(p, sizeof (*p));
p->pfra_af = af;
p->pfra_net = net;
if (af == AF_INET)
p->pfra_ip4addr = ((struct sockaddr_in *)sa)->sin_addr;
else if (af == AF_INET6) {
p->pfra_ip6addr = ((struct sockaddr_in6 *)sa)->sin6_addr;
if (IN6_IS_SCOPE_EMBED(&p->pfra_ip6addr))
p->pfra_ip6addr.s6_addr16[1] = 0;
}
if (net < 128)
((caddr_t)p)[p->pfra_net/8] &= ~(0xFF >> (p->pfra_net%8));
for (i = (p->pfra_net+7)/8; i < (int)sizeof (p->pfra_u); i++)
((caddr_t)p)[i] = 0;
}
void
pfi_dynaddr_remove(struct pf_addr_wrap *aw)
{
if (aw->type != PF_ADDR_DYNIFTL || aw->p.dyn == NULL ||
aw->p.dyn->pfid_kif == NULL || aw->p.dyn->pfid_kt == NULL)
return;
TAILQ_REMOVE(&aw->p.dyn->pfid_kif->pfik_dynaddrs, aw->p.dyn, entry);
pfi_kif_unref(aw->p.dyn->pfid_kif, PFI_KIF_REF_RULE);
aw->p.dyn->pfid_kif = NULL;
pfr_detach_table(aw->p.dyn->pfid_kt);
aw->p.dyn->pfid_kt = NULL;
pool_put(&pfi_addr_pl, aw->p.dyn);
aw->p.dyn = NULL;
}
void
pfi_dynaddr_copyout(struct pf_addr_wrap *aw)
{
if (aw->type != PF_ADDR_DYNIFTL || aw->p.dyn == NULL ||
aw->p.dyn->pfid_kif == NULL)
return;
aw->p.dyncnt = aw->p.dyn->pfid_acnt4 + aw->p.dyn->pfid_acnt6;
}
void
pfi_kifaddr_update(void *v)
{
struct pfi_kif *kif = (struct pfi_kif *)v;
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
pfi_update++;
pfi_kif_update(kif);
}
int
pfi_if_compare(struct pfi_kif *p, struct pfi_kif *q)
{
return (strncmp(p->pfik_name, q->pfik_name, IFNAMSIZ));
}
void
pfi_update_status(const char *name, struct pf_status *pfs)
{
struct pfi_kif *p;
struct pfi_kif_cmp key;
int i, j, k;
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
strlcpy(key.pfik_name, name, sizeof (key.pfik_name));
p = RB_FIND(pfi_ifhead, &pfi_ifs, (struct pfi_kif *)&key);
if (p == NULL)
return;
if (pfs) {
bzero(pfs->pcounters, sizeof (pfs->pcounters));
bzero(pfs->bcounters, sizeof (pfs->bcounters));
}
if (pfs == NULL) {
bzero(p->pfik_packets, sizeof (p->pfik_packets));
bzero(p->pfik_bytes, sizeof (p->pfik_bytes));
p->pfik_tzero = pf_time_second();
}
for (i = 0; i < 2; i++)
for (j = 0; j < 2; j++)
for (k = 0; k < 2; k++) {
pfs->pcounters[i][j][k] +=
p->pfik_packets[i][j][k];
pfs->bcounters[i][j] +=
p->pfik_bytes[i][j][k];
}
}
int
pfi_get_ifaces(const char *name, struct pfi_kif *buf, int *size)
{
struct pfi_kif *p, *nextp;
int n = 0;
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
for (p = RB_MIN(pfi_ifhead, &pfi_ifs); p; p = nextp) {
nextp = RB_NEXT(pfi_ifhead, &pfi_ifs, p);
if (pfi_skip_if(name, p))
continue;
if (*size > n++) {
if (!p->pfik_tzero)
p->pfik_tzero = pf_time_second();
pfi_kif_ref(p, PFI_KIF_REF_RULE);
buf++;
if (copyout(p, CAST_USER_ADDR_T(buf), sizeof (*buf))) {
pfi_kif_unref(p, PFI_KIF_REF_RULE);
return (EFAULT);
}
nextp = RB_NEXT(pfi_ifhead, &pfi_ifs, p);
pfi_kif_unref(p, PFI_KIF_REF_RULE);
}
}
*size = n;
return (0);
}
int
pfi_skip_if(const char *filter, struct pfi_kif *p)
{
int n;
if (filter == NULL || !*filter)
return (0);
if (strcmp(p->pfik_name, filter) == 0)
return (0);
n = strlen(filter);
if (n < 1 || n >= IFNAMSIZ)
return (1);
if (filter[n-1] >= '0' && filter[n-1] <= '9')
return (1);
if (strncmp(p->pfik_name, filter, n))
return (1);
return (p->pfik_name[n] < '0' || p->pfik_name[n] > '9');
}
int
pfi_set_flags(const char *name, int flags)
{
struct pfi_kif *p;
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
RB_FOREACH(p, pfi_ifhead, &pfi_ifs) {
if (pfi_skip_if(name, p))
continue;
p->pfik_flags |= flags;
}
return (0);
}
int
pfi_clear_flags(const char *name, int flags)
{
struct pfi_kif *p;
lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
RB_FOREACH(p, pfi_ifhead, &pfi_ifs) {
if (pfi_skip_if(name, p))
continue;
p->pfik_flags &= ~flags;
}
return (0);
}
int
pfi_unmask(void *addr)
{
struct pf_addr *m = addr;
int i = 31, j = 0, b = 0;
u_int32_t tmp;
while (j < 4 && m->addr32[j] == 0xffffffff) {
b += 32;
j++;
}
if (j < 4) {
tmp = ntohl(m->addr32[j]);
for (i = 31; tmp & (1 << i); --i)
b++;
}
return (b);
}