#include <sys/param.h>
#include <sys/systm.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/malloc.h>
#include <libkern/OSAtomic.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/in_gif.h>
#include <netinet/in_var.h>
#include <netinet/ip_encap.h>
#include <netinet/ip_ecn.h>
#if INET6
#include <netinet/ip6.h>
#endif
#if MROUTING
#include <netinet/ip_mroute.h>
#endif
#include <net/if_gif.h>
#include <net/net_osdep.h>
int ip_gif_ttl = GIF_TTL;
SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW | CTLFLAG_LOCKED,
&ip_gif_ttl, 0, "");
int
in_gif_output(
struct ifnet *ifp,
int family,
struct mbuf *m,
__unused struct rtentry *rt)
{
struct gif_softc *sc = ifnet_softc(ifp);
struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst;
struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
struct ip iphdr;
int proto, error;
u_int8_t tos;
struct ip_out_args ipoa = { IFSCOPE_NONE, 0 };
if (sin_src == NULL || sin_dst == NULL ||
sin_src->sin_family != AF_INET ||
sin_dst->sin_family != AF_INET) {
m_freem(m);
return EAFNOSUPPORT;
}
switch (family) {
#if INET
case AF_INET:
{
struct ip *ip;
proto = IPPROTO_IPV4;
if (mbuf_len(m) < sizeof(*ip)) {
m = m_pullup(m, sizeof(*ip));
if (!m)
return ENOBUFS;
}
ip = mtod(m, struct ip *);
tos = ip->ip_tos;
break;
}
#endif
#if INET6
case AF_INET6:
{
struct ip6_hdr *ip6;
proto = IPPROTO_IPV6;
if (mbuf_len(m) < sizeof(*ip6)) {
m = m_pullup(m, sizeof(*ip6));
if (!m)
return ENOBUFS;
}
ip6 = mtod(m, struct ip6_hdr *);
tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
break;
}
#endif
default:
#if DEBUG
printf("in_gif_output: warning: unknown family %d passed\n",
family);
#endif
m_freem(m);
return EAFNOSUPPORT;
}
bzero(&iphdr, sizeof(iphdr));
iphdr.ip_src = sin_src->sin_addr;
if (sin_dst->sin_addr.s_addr != INADDR_ANY)
iphdr.ip_dst = sin_dst->sin_addr;
else {
m_freem(m);
return ENETUNREACH;
}
iphdr.ip_p = proto;
iphdr.ip_ttl = ip_gif_ttl;
iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
if (ifp->if_flags & IFF_LINK1)
ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);
else
ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
if (m && mbuf_len(m) < sizeof(struct ip))
m = m_pullup(m, sizeof(struct ip));
if (m == NULL) {
printf("ENOBUFS in in_gif_output %d\n", __LINE__);
return ENOBUFS;
}
bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
if (dst->sin_family != sin_dst->sin_family ||
dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr ||
(sc->gif_ro.ro_rt != NULL &&
(sc->gif_ro.ro_rt->generation_id != route_generation ||
sc->gif_ro.ro_rt->rt_ifp == ifp))) {
dst->sin_family = sin_dst->sin_family;
dst->sin_len = sizeof(struct sockaddr_in);
dst->sin_addr = sin_dst->sin_addr;
if (sc->gif_ro.ro_rt) {
rtfree(sc->gif_ro.ro_rt);
sc->gif_ro.ro_rt = NULL;
}
#if 0
sc->gif_if.if_mtu = GIF_MTU;
#endif
}
if (sc->gif_ro.ro_rt == NULL) {
rtalloc(&sc->gif_ro);
if (sc->gif_ro.ro_rt == NULL) {
m_freem(m);
return ENETUNREACH;
}
RT_LOCK(sc->gif_ro.ro_rt);
if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
RT_UNLOCK(sc->gif_ro.ro_rt);
m_freem(m);
return ENETUNREACH;
}
#if 0
ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
- sizeof(struct ip);
#endif
RT_UNLOCK(sc->gif_ro.ro_rt);
}
error = ip_output(m, NULL, &sc->gif_ro, IP_OUTARGS, NULL, &ipoa);
return(error);
}
void
in_gif_input(m, off)
struct mbuf *m;
int off;
{
struct ifnet *gifp = NULL;
struct ip *ip;
int af, proto;
u_int8_t otos;
ip = mtod(m, struct ip *);
proto = ip->ip_p;
gifp = ((struct gif_softc*)encap_getarg(m))->gif_if;
if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
m_freem(m);
OSAddAtomic(1, &ipstat.ips_nogif);
return;
}
otos = ip->ip_tos;
m_adj(m, off);
switch (proto) {
#if INET
case IPPROTO_IPV4:
{
af = AF_INET;
if (mbuf_len(m) < sizeof(*ip)) {
m = m_pullup(m, sizeof(*ip));
if (!m)
return;
}
ip = mtod(m, struct ip *);
if (gifp->if_flags & IFF_LINK1)
ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
else
ip_ecn_egress(ECN_NOCARE, &otos, &ip->ip_tos);
break;
}
#endif
#if INET6
case IPPROTO_IPV6:
{
struct ip6_hdr *ip6;
u_int8_t itos;
af = AF_INET6;
if (mbuf_len(m) < sizeof(*ip6)) {
m = m_pullup(m, sizeof(*ip6));
if (!m)
return;
}
ip6 = mtod(m, struct ip6_hdr *);
itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
if (gifp->if_flags & IFF_LINK1)
ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
else
ip_ecn_egress(ECN_NOCARE, &otos, &itos);
ip6->ip6_flow &= ~htonl(0xff << 20);
ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
break;
}
#endif
default:
OSAddAtomic(1, &ipstat.ips_nogif);
m_freem(m);
return;
}
#ifdef __APPLE__
if (m->m_pkthdr.rcvif)
m->m_pkthdr.rcvif = gifp;
ifnet_input(gifp, m, NULL);
#else
gif_input(m, af, gifp);
#endif
return;
}
static __inline__ void*
_cast_non_const(const void * ptr) {
union {
const void* cval;
void* val;
} ret;
ret.cval = ptr;
return (ret.val);
}
int
gif_encapcheck4(
const struct mbuf *m,
__unused int off,
__unused int proto,
void *arg)
{
struct ip ip;
struct gif_softc *sc;
struct sockaddr_in *src, *dst;
int addrmatch;
struct in_ifaddr *ia4;
sc = (struct gif_softc *)arg;
src = (struct sockaddr_in *)sc->gif_psrc;
dst = (struct sockaddr_in *)sc->gif_pdst;
mbuf_copydata((struct mbuf *)(size_t)m, 0, sizeof(ip), &ip);
addrmatch = 0;
if (src->sin_addr.s_addr == ip.ip_dst.s_addr)
addrmatch |= 1;
if (dst->sin_addr.s_addr == ip.ip_src.s_addr)
addrmatch |= 2;
if (addrmatch != 3)
return 0;
if (IN_MULTICAST(ntohl(ip.ip_src.s_addr)))
return 0;
switch ((ntohl(ip.ip_src.s_addr) & 0xff000000) >> 24) {
case 0: case 127: case 255:
return 0;
}
lck_rw_lock_shared(in_ifaddr_rwlock);
for (ia4 = TAILQ_FIRST(&in_ifaddrhead); ia4;
ia4 = TAILQ_NEXT(ia4, ia_link))
{
if ((ifnet_flags(ia4->ia_ifa.ifa_ifp) & IFF_BROADCAST) == 0)
continue;
IFA_LOCK(&ia4->ia_ifa);
if (ip.ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr) {
IFA_UNLOCK(&ia4->ia_ifa);
lck_rw_done(in_ifaddr_rwlock);
return 0;
}
IFA_UNLOCK(&ia4->ia_ifa);
}
lck_rw_done(in_ifaddr_rwlock);
if ((ifnet_flags(sc->gif_if) & IFF_LINK2) == 0 &&
(m->m_flags & M_PKTHDR) != 0 && m->m_pkthdr.rcvif) {
struct sockaddr_in sin;
struct rtentry *rt;
bzero(&sin, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_len = sizeof(struct sockaddr_in);
sin.sin_addr = ip.ip_src;
rt = rtalloc1_scoped((struct sockaddr *)&sin, 0, 0,
m->m_pkthdr.rcvif->if_index);
if (rt != NULL)
RT_LOCK(rt);
if (rt == NULL || rt->rt_ifp != m->m_pkthdr.rcvif) {
if (rt != NULL) {
RT_UNLOCK(rt);
rtfree(rt);
}
return 0;
}
RT_UNLOCK(rt);
rtfree(rt);
}
return 32 * 2;
}