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Differential D8877 Diff 23178 sys/netinet/ip_fastfwd.c

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sys/netinet/ip_fastfwd.c

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{ {
struct ip *ip; struct ip *ip;
struct mbuf *m0 = NULL; struct mbuf *m0 = NULL;
struct nhop4_basic nh; struct nhop4_basic nh;
struct sockaddr_in dst; struct sockaddr_in dst;
struct in_addr odest, dest; struct in_addr odest, dest;
uint16_t ip_len, ip_off; uint16_t ip_len, ip_off;
int error = 0; int error = 0;
struct m_tag *fwd_tag = NULL;
/* /*
* Are we active and forwarding packets? * Are we active and forwarding packets?
*/ */
M_ASSERTVALID(m); M_ASSERTVALID(m);
M_ASSERTPKTHDR(m); M_ASSERTPKTHDR(m);
▲ Show 20 Lines • Show All 146 Lines • ▼ Show 20 Lines#endif
M_ASSERTPKTHDR(m); M_ASSERTPKTHDR(m);
ip = mtod(m, struct ip *); ip = mtod(m, struct ip *);
dest.s_addr = ip->ip_dst.s_addr; dest.s_addr = ip->ip_dst.s_addr;
/* /*
* Destination address changed? * Destination address changed?
*/ */
if (m->m_flags & M_IP_NEXTHOP) if (odest.s_addr != dest.s_addr ||
fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL); (IP_HAS_NEXTHOP(m) && !ip_get_fwdtag(m, &dst, NULL))) {
if (odest.s_addr != dest.s_addr || fwd_tag != NULL) {
/* /*
* Is it now for a local address on this host? * Is it now for a local address on this host?
*/ */
if (m->m_flags & M_FASTFWD_OURS || in_localip(dest)) { if (m->m_flags & M_FASTFWD_OURS || in_localip(dest)) {
forwardlocal: forwardlocal:
/* /*
* Return packet for processing by ip_input(). * Return packet for processing by ip_input().
*/ */
m->m_flags |= M_FASTFWD_OURS; m->m_flags |= M_FASTFWD_OURS;
return (m); return (m);
} }
if (IP_HAS_NEXTHOP(m)) {
dest.s_addr = dst.sin_addr.s_addr;
ip_flush_fwdtag(m);
}
/* /*
* Redo route lookup with new destination address * Redo route lookup with new destination address
*/ */
if (fwd_tag) {
dest.s_addr = ((struct sockaddr_in *)
(fwd_tag + 1))->sin_addr.s_addr;
m_tag_delete(m, fwd_tag);
m->m_flags &= ~M_IP_NEXTHOP;
}
if (ip_findroute(&nh, dest, m) != 0) if (ip_findroute(&nh, dest, m) != 0)
return (NULL); /* icmp unreach already sent */ return (NULL); /* icmp unreach already sent */
} }
passout: passout:
/* /*
* Step 6: send off the packet * Step 6: send off the packet
*/ */
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