#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/queue.h>
#include <sys/syslog.h>
#include <sys/malloc.h>
#include <sys/protosw.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#if INET
#include <netinet/ip.h>
#endif
#include <netinet/ip_encap.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_gif.h>
#include <netinet6/in6_var.h>
#include <netinet/ip_ecn.h>
#include <netinet6/ip6_ecn.h>
#include <net/if_gif.h>
#include <net/net_osdep.h>
int
in6_gif_output(
struct ifnet *ifp,
int family,
struct mbuf *m,
__unused struct rtentry *rt)
{
struct gif_softc *sc = ifnet_softc(ifp);
struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst;
struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)
(void *)sc->gif_psrc;
struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)
(void *)sc->gif_pdst;
struct ip6_hdr *ip6;
int proto;
u_int8_t itos, otos;
GIF_LOCK_ASSERT(sc);
if (sin6_src == NULL || sin6_dst == NULL ||
sin6_src->sin6_family != AF_INET6 ||
sin6_dst->sin6_family != AF_INET6) {
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 *);
itos = ip->ip_tos;
break;
}
#endif
case AF_INET6:
{
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 *);
itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
break;
}
default:
#if DEBUG
printf("in6_gif_output: warning: unknown family %d passed\n",
family);
#endif
m_freem(m);
return EAFNOSUPPORT;
}
M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT, 1);
if (m && mbuf_len(m) < sizeof(struct ip6_hdr)) {
m = m_pullup(m, sizeof(struct ip6_hdr));
}
if (m == NULL) {
printf("ENOBUFS in in6_gif_output %d\n", __LINE__);
return ENOBUFS;
}
ip6 = mtod(m, struct ip6_hdr *);
ip6->ip6_flow = 0;
ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
ip6->ip6_vfc |= IPV6_VERSION;
ip6->ip6_plen = htons((u_short)m->m_pkthdr.len);
ip6->ip6_nxt = proto;
ip6->ip6_hlim = ip6_gif_hlim;
ip6->ip6_src = sin6_src->sin6_addr;
if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr)) {
ip6->ip6_dst = sin6_dst->sin6_addr;
} else {
m_freem(m);
return ENETUNREACH;
}
ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_NORMAL : ECN_NOCARE,
&otos, &itos);
ip6->ip6_flow &= ~htonl(0xff << 20);
ip6->ip6_flow |= htonl((u_int32_t)otos << 20);
if (ROUTE_UNUSABLE(&sc->gif_ro6) ||
dst->sin6_family != sin6_dst->sin6_family ||
!IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr) ||
(sc->gif_ro6.ro_rt != NULL && sc->gif_ro6.ro_rt->rt_ifp == ifp)) {
bzero(dst, sizeof(*dst));
dst->sin6_family = sin6_dst->sin6_family;
dst->sin6_len = sizeof(struct sockaddr_in6);
dst->sin6_addr = sin6_dst->sin6_addr;
ROUTE_RELEASE(&sc->gif_ro6);
#if 0
sc->gif_if.if_mtu = GIF_MTU;
#endif
}
if (sc->gif_ro6.ro_rt == NULL) {
rtalloc((struct route *)&sc->gif_ro6);
if (sc->gif_ro6.ro_rt == NULL) {
m_freem(m);
return ENETUNREACH;
}
RT_LOCK(sc->gif_ro6.ro_rt);
if (sc->gif_ro6.ro_rt->rt_ifp == ifp) {
RT_UNLOCK(sc->gif_ro6.ro_rt);
m_freem(m);
return ENETUNREACH;
}
#if 0
ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu
- sizeof(struct ip6_hdr);
#endif
RT_UNLOCK(sc->gif_ro6.ro_rt);
}
#if IPV6_MINMTU
return ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL);
#else
return ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL);
#endif
}
int
in6_gif_input(struct mbuf **mp, int *offp, int proto)
{
struct mbuf *m = *mp;
struct ifnet *gifp = NULL;
struct ip6_hdr *ip6;
int af = 0;
u_int32_t otos;
int egress_success = 0;
ip6 = mtod(m, struct ip6_hdr *);
gifp = ((struct gif_softc *)encap_getarg(m))->gif_if;
if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
m_freem(m);
ip6stat.ip6s_nogif++;
return IPPROTO_DONE;
}
otos = ip6->ip6_flow;
m_adj(m, *offp);
switch (proto) {
case IPPROTO_IPV4:
{
struct ip *ip;
u_int8_t otos8, old_tos;
int sum;
af = AF_INET;
otos8 = (ntohl(otos) >> 20) & 0xff;
if (mbuf_len(m) < sizeof(*ip)) {
m = m_pullup(m, sizeof(*ip));
if (!m) {
return IPPROTO_DONE;
}
}
ip = mtod(m, struct ip *);
if (gifp->if_flags & IFF_LINK1) {
old_tos = ip->ip_tos;
egress_success = ip_ecn_egress(ECN_NORMAL, &otos8, &ip->ip_tos);
if (old_tos != ip->ip_tos) {
sum = ~ntohs(ip->ip_sum) & 0xffff;
sum += (~old_tos & 0xffff) + ip->ip_tos;
sum = (sum >> 16) + (sum & 0xffff);
sum += (sum >> 16);
ip->ip_sum = htons(~sum & 0xffff);
}
} else {
egress_success = ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos);
}
break;
}
case IPPROTO_IPV6:
{
af = AF_INET6;
if (mbuf_len(m) < sizeof(*ip6)) {
m = m_pullup(m, sizeof(*ip6));
if (!m) {
return IPPROTO_DONE;
}
}
ip6 = mtod(m, struct ip6_hdr *);
if (gifp->if_flags & IFF_LINK1) {
egress_success = ip6_ecn_egress(ECN_NORMAL, &otos, &ip6->ip6_flow);
} else {
egress_success = ip6_ecn_egress(ECN_NOCARE, &otos, &ip6->ip6_flow);
}
break;
}
default:
ip6stat.ip6s_nogif++;
m_freem(m);
return IPPROTO_DONE;
}
if (egress_success == 0) {
ip6stat.ip6s_nogif++;
m_freem(m);
return IPPROTO_DONE;
}
if (m->m_pkthdr.rcvif) {
m->m_pkthdr.rcvif = gifp;
}
ifnet_input(gifp, m, NULL);
return IPPROTO_DONE;
}
static int
gif_validate6(
const struct ip6_hdr *ip6,
struct gif_softc *sc,
struct ifnet *ifp)
{
struct sockaddr_in6 *src, *dst;
src = (struct sockaddr_in6 *)(void *)sc->gif_psrc;
dst = (struct sockaddr_in6 *)(void *)sc->gif_pdst;
if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) ||
!IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src)) {
return 0;
}
if ((ifnet_flags(sc->gif_if) & IFF_LINK2) == 0 && ifp) {
struct sockaddr_in6 sin6;
struct rtentry *rt;
bzero(&sin6, sizeof(sin6));
sin6.sin6_family = AF_INET6;
sin6.sin6_len = sizeof(struct sockaddr_in6);
sin6.sin6_addr = ip6->ip6_src;
rt = rtalloc1((struct sockaddr *)&sin6, 0, 0);
if (rt != NULL) {
RT_LOCK(rt);
}
if (!rt || rt->rt_ifp != ifp) {
#if 0
log(LOG_WARNING, "%s: packet from %s dropped "
"due to ingress filter\n", if_name(&sc->gif_if),
ip6_sprintf(&sin6.sin6_addr));
#endif
if (rt != NULL) {
RT_UNLOCK(rt);
rtfree(rt);
}
return 0;
}
RT_UNLOCK(rt);
rtfree(rt);
}
return 128 * 2;
}
int
gif_encapcheck6(
const struct mbuf *m,
__unused int off,
__unused int proto,
void *arg)
{
struct ip6_hdr ip6;
struct gif_softc *sc;
struct ifnet *ifp;
sc = (struct gif_softc *)arg;
GIF_LOCK_ASSERT(sc);
mbuf_copydata((struct mbuf *)(size_t)m, 0, sizeof(ip6), &ip6);
ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
return gif_validate6(&ip6, sc, ifp);
}