#if (defined(__FreeBSD__) && __FreeBSD__ >= 3)
#include "opt_ip6fw.h"
#include "opt_inet.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet/icmp6.h>
#include <netinet6/nd6.h>
#if IPSEC_IPV6FWD
#include <netinet6/ipsec.h>
#include <netkey/key.h>
#include <netkey/key_debug.h>
#endif
#if IPV6FIREWALL
#include <netinet6/ip6_fw.h>
#endif
#if MIP6
#include <netinet6/mip6.h>
#endif
#include <net/net_osdep.h>
struct route_in6 ip6_forward_rt;
void
ip6_forward(m, srcrt)
struct mbuf *m;
int srcrt;
{
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
register struct sockaddr_in6 *dst;
register struct rtentry *rt;
int error, type = 0, code = 0;
struct mbuf *mcopy = NULL;
#if IPSEC_IPV6FWD
struct secpolicy *sp = NULL;
#endif
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) && !defined(__APPLE__)
long time_second = time.tv_sec;
#endif
#if IPSEC_IPV6FWD
if (ipsec6_in_reject(m, NULL)) {
ipsec6stat.in_polvio++;
m_freem(m);
return;
}
#endif
if ((m->m_flags & (M_BCAST|M_MCAST)) != 0 ||
IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
ip6stat.ip6s_cantforward++;
if (ip6_log_time + ip6_log_interval < time_second) {
ip6_log_time = time_second;
log(LOG_DEBUG,
"cannot forward "
"from %s to %s nxt %d received on %s\n",
ip6_sprintf(&ip6->ip6_src),
ip6_sprintf(&ip6->ip6_dst),
ip6->ip6_nxt,
if_name(m->m_pkthdr.rcvif));
}
m_freem(m);
return;
}
if (ip6->ip6_hlim <= IPV6_HLIMDEC) {
icmp6_error(m, ICMP6_TIME_EXCEEDED,
ICMP6_TIME_EXCEED_TRANSIT, 0);
return;
}
ip6->ip6_hlim -= IPV6_HLIMDEC;
mcopy = m_copy(m, 0, imin(m->m_pkthdr.len, ICMPV6_PLD_MAXLEN));
#if IPSEC_IPV6FWD
sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error);
if (sp == NULL) {
ipsec6stat.out_inval++;
ip6stat.ip6s_cantforward++;
if (mcopy) {
#if 0
#else
m_freem(mcopy);
#endif
}
m_freem(m);
return;
}
error = 0;
switch (sp->policy) {
case IPSEC_POLICY_DISCARD:
ipsec6stat.out_polvio++;
ip6stat.ip6s_cantforward++;
key_freesp(sp);
if (mcopy) {
#if 0
#else
m_freem(mcopy);
#endif
}
m_freem(m);
return;
case IPSEC_POLICY_BYPASS:
case IPSEC_POLICY_NONE:
key_freesp(sp);
goto skip_ipsec;
case IPSEC_POLICY_IPSEC:
if (sp->req == NULL) {
printf("ip6_forward: No IPsec request specified.\n");
ip6stat.ip6s_cantforward++;
key_freesp(sp);
if (mcopy) {
#if 0
#else
m_freem(mcopy);
#endif
}
m_freem(m);
return;
}
break;
case IPSEC_POLICY_ENTRUST:
default:
printf("ip6_forward: Invalid policy found. %d\n", sp->policy);
key_freesp(sp);
goto skip_ipsec;
}
{
struct ipsec_output_state state;
bzero(&state, sizeof(state));
state.m = m;
state.ro = NULL;
state.dst = NULL;
error = ipsec6_output_tunnel(&state, sp, 0);
m = state.m;
#if 0
ro = (struct route_in6 *)state.ro;
dst = (struct sockaddr_in6 *)state.dst;
#endif
key_freesp(sp);
if (error) {
switch (error) {
case EHOSTUNREACH:
case ENETUNREACH:
case EMSGSIZE:
case ENOBUFS:
case ENOMEM:
break;
default:
printf("ip6_output (ipsec): error code %d\n", error);
case ENOENT:
break;
}
ip6stat.ip6s_cantforward++;
if (mcopy) {
#if 0
#else
m_freem(mcopy);
#endif
}
m_freem(m);
return;
}
}
skip_ipsec:
#endif
#if MIP6
{
struct mip6_bc *bc;
bc = mip6_bc_find(&ip6->ip6_dst);
if ((bc != NULL) && (bc->hr_flag)) {
if (mip6_tunnel_output(&m, bc) != 0) {
ip6stat.ip6s_cantforward++;
if (mcopy)
m_freem(mcopy);
m_freem(m);
return;
}
}
ip6 = mtod(m, struct ip6_hdr *);
}
#endif
dst = &ip6_forward_rt.ro_dst;
if (!srcrt) {
if (ip6_forward_rt.ro_rt == 0 ||
(ip6_forward_rt.ro_rt->rt_flags & RTF_UP) == 0) {
if (ip6_forward_rt.ro_rt) {
RTFREE(ip6_forward_rt.ro_rt);
ip6_forward_rt.ro_rt = 0;
}
#if __FreeBSD__ || defined(__APPLE__)
rtalloc_ign((struct route *)&ip6_forward_rt,
RTF_PRCLONING);
#else
rtalloc((struct route *)&ip6_forward_rt);
#endif
}
if (ip6_forward_rt.ro_rt == 0) {
ip6stat.ip6s_noroute++;
if (mcopy) {
icmp6_error(mcopy, ICMP6_DST_UNREACH,
ICMP6_DST_UNREACH_NOROUTE, 0);
}
m_freem(m);
return;
}
} else if ((rt = ip6_forward_rt.ro_rt) == 0 ||
!IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &dst->sin6_addr)) {
if (ip6_forward_rt.ro_rt) {
RTFREE(ip6_forward_rt.ro_rt);
ip6_forward_rt.ro_rt = 0;
}
bzero(dst, sizeof(*dst));
dst->sin6_len = sizeof(struct sockaddr_in6);
dst->sin6_family = AF_INET6;
dst->sin6_addr = ip6->ip6_dst;
#if __FreeBSD__ || defined(__APPLE__)
rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING);
#else
rtalloc((struct route *)&ip6_forward_rt);
#endif
if (ip6_forward_rt.ro_rt == 0) {
ip6stat.ip6s_noroute++;
if (mcopy) {
icmp6_error(mcopy, ICMP6_DST_UNREACH,
ICMP6_DST_UNREACH_NOROUTE, 0);
}
m_freem(m);
return;
}
}
rt = ip6_forward_rt.ro_rt;
if (in6_addr2scopeid(m->m_pkthdr.rcvif, &ip6->ip6_src) !=
in6_addr2scopeid(rt->rt_ifp, &ip6->ip6_src)) {
ip6stat.ip6s_cantforward++;
ip6stat.ip6s_badscope++;
in6_ifstat_inc(rt->rt_ifp, ifs6_in_discard);
if (ip6_log_time + ip6_log_interval < time_second) {
ip6_log_time = time_second;
log(LOG_DEBUG,
"cannot forward "
"src %s, dst %s, nxt %d, rcvif %s, outif %s\n",
ip6_sprintf(&ip6->ip6_src),
ip6_sprintf(&ip6->ip6_dst),
ip6->ip6_nxt,
if_name(m->m_pkthdr.rcvif), if_name(rt->rt_ifp));
}
if (mcopy)
icmp6_error(mcopy, ICMP6_DST_UNREACH,
ICMP6_DST_UNREACH_BEYONDSCOPE, 0);
m_freem(m);
return;
}
if (m->m_pkthdr.len > rt->rt_ifp->if_mtu) {
in6_ifstat_inc(rt->rt_ifp, ifs6_in_toobig);
if (mcopy) {
u_long mtu;
#if IPSEC_IPV6FWD
struct secpolicy *sp;
int ipsecerror;
size_t ipsechdrsiz;
#endif
mtu = rt->rt_ifp->if_mtu;
#if IPSEC_IPV6FWD
sp = ipsec6_getpolicybyaddr(mcopy, IPSEC_DIR_OUTBOUND,
IP_FORWARDING, &ipsecerror);
if (sp) {
ipsechdrsiz = ipsec6_hdrsiz(mcopy,
IPSEC_DIR_OUTBOUND, NULL);
if (ipsechdrsiz < mtu)
mtu -= ipsechdrsiz;
}
if (mtu < IPV6_MMTU)
mtu = IPV6_MMTU;
#endif
icmp6_error(mcopy, ICMP6_PACKET_TOO_BIG, 0, mtu);
}
m_freem(m);
return;
}
if (rt->rt_flags & RTF_GATEWAY)
dst = (struct sockaddr_in6 *)rt->rt_gateway;
if (rt->rt_ifp == m->m_pkthdr.rcvif && !srcrt &&
(rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0)
type = ND_REDIRECT;
#if IPV6FIREWALL
if (ip6_fw_chk_ptr) {
u_short port = 0;
if ((*ip6_fw_chk_ptr)(&ip6, rt->rt_ifp, &port, &m)) {
m_freem(m);
goto freecopy;
}
if (!m)
goto freecopy;
}
#endif
#if OLDIP6OUTPUT
error = (*rt->rt_ifp->if_output)(rt->rt_ifp, m,
(struct sockaddr *)dst,
ip6_forward_rt.ro_rt);
#else
error = nd6_output(rt->rt_ifp, m, dst, rt);
#endif
if (error) {
in6_ifstat_inc(rt->rt_ifp, ifs6_out_discard);
ip6stat.ip6s_cantforward++;
} else {
ip6stat.ip6s_forward++;
in6_ifstat_inc(rt->rt_ifp, ifs6_out_forward);
if (type)
ip6stat.ip6s_redirectsent++;
else {
if (mcopy)
goto freecopy;
}
}
if (mcopy == NULL)
return;
switch (error) {
case 0:
#if 1
if (type == ND_REDIRECT) {
icmp6_redirect_output(mcopy, rt);
return;
}
#endif
goto freecopy;
case EMSGSIZE:
goto freecopy;
case ENOBUFS:
goto freecopy;
case ENETUNREACH:
case EHOSTUNREACH:
case ENETDOWN:
case EHOSTDOWN:
default:
type = ICMP6_DST_UNREACH;
code = ICMP6_DST_UNREACH_ADDR;
break;
}
icmp6_error(mcopy, type, code, 0);
return;
freecopy:
m_freem(mcopy);
return;
}