sys/netinet/ip_input.c

74 #include <netinet/ip.h>
91 CTASSERT(sizeof(struct ip) == 20);
143 	.nh_name = "ip",
416 VNET_SYSUNINIT(ip, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip_destroy, NULL);
429 	struct ip *ip;
432 	ip = mtod(m, struct ip *);
433 	hlen = ip->ip_hl << 2;
437 		if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0)
442 	(*inetsw[ip_protox[ip->ip_p]].pr_input)(&m, &hlen, ip->ip_p);
455 	struct ip *ip = NULL;
469 		ip = mtod(m, struct ip *);
470 		hlen = ip->ip_hl << 2;
471 		ip_len = ntohs(ip->ip_len);
477 	if (m->m_pkthdr.len < sizeof(struct ip))
480 	if (m->m_len < sizeof (struct ip) &&
481 	    (m = m_pullup(m, sizeof (struct ip))) == NULL) {
485 	ip = mtod(m, struct ip *);
487 	if (ip->ip_v != IPVERSION) {
492 	hlen = ip->ip_hl << 2;
493 	if (hlen < sizeof(struct ip)) {	/* minimum header length */
502 		ip = mtod(m, struct ip *);
505 	IP_PROBE(receive, NULL, NULL, ip, m->m_pkthdr.rcvif, ip, NULL);
509 	if (IN_LOOPBACK(ntohl(ip->ip_dst.s_addr)) ||
510 	    IN_LOOPBACK(ntohl(ip->ip_src.s_addr))) {
520 		if (hlen == sizeof(struct ip)) {
521 			sum = in_cksum_hdr(ip);
537 	ip_len = ntohs(ip->ip_len);
570 	 * ip pointer.
582 			ip = mtod(m, struct ip *);
608 	odst = ip->ip_dst;
614 	ip = mtod(m, struct ip *);
615 	dchg = (odst.s_addr != ip->ip_dst.s_addr);
641 	if (hlen > sizeof (struct ip) && ip_dooptions(m, 0))
650 	if (V_rsvp_on && ip->ip_p==IPPROTO_RSVP)
689 	LIST_FOREACH(ia, INADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
695 		if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr &&
721 			    ip->ip_dst.s_addr) {
741 	if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
746 		if (V_ip_mrouter && !IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) {
755 			if (ip_mforward && ip_mforward(ip, ifp, m, 0) != 0) {
766 			if (ip->ip_p == IPPROTO_IGMP)
777 	if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST)
779 	if (ip->ip_dst.s_addr == INADDR_ANY)
782 	if (IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr)) ||
783 	    IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) {
806 	if (V_ipstealth && hlen > sizeof (struct ip) && ip_dooptions(m, 1))
814 	if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) {
819 		ip = mtod(m, struct ip *);
821 		hlen = ip->ip_hl << 2;
826 		if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0)
836 	(*inetsw[ip_protox[ip->ip_p]].pr_input)(&m, &hlen, ip->ip_p);
957 	struct ip *ip = mtod(m, struct ip *);
965 	if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
974 	    ip->ip_ttl <= IPTTLDEC) {
983 	sin->sin_addr = ip->ip_dst;
986 	    ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr),
1024 		mcopy->m_len = min(ntohs(ip->ip_len), M_TRAILINGSPACE(mcopy));
1031 		ip->ip_ttl -= IPTTLDEC;
1062 			u_long src = ntohl(ip->ip_src.s_addr);
1069 					dest.s_addr = ip->ip_dst.s_addr;
1131 				mtu = ip_next_mtu(ntohs(ip->ip_len), 0);
1150 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
1246 		*mp = sbcreatecontrol((caddr_t)&ip->ip_dst,
1252 		*mp = sbcreatecontrol((caddr_t)&ip->ip_ttl,
1311 		*mp = sbcreatecontrol((caddr_t)&ip->ip_tos,