90 static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb);
91 static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb);
94 static void pndisc_redo(struct sk_buff *skb);
153 static void ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data)  in ndisc_fill_addr_option()  argument
155 	int pad   = ndisc_addr_option_pad(skb->dev->type);  in ndisc_fill_addr_option()
156 	int data_len = skb->dev->addr_len;  in ndisc_fill_addr_option()
157 	int space = ndisc_opt_addr_space(skb->dev);  in ndisc_fill_addr_option()
158 	u8 *opt = skb_put(skb, space);  in ndisc_fill_addr_option()
386 	struct sk_buff *skb;  in ndisc_alloc_skb()  local
388 	skb = alloc_skb(hlen + sizeof(struct ipv6hdr) + len + tlen, GFP_ATOMIC);  in ndisc_alloc_skb()
389 	if (!skb) {  in ndisc_alloc_skb()
395 	skb->protocol = htons(ETH_P_IPV6);  in ndisc_alloc_skb()
396 	skb->dev = dev;  in ndisc_alloc_skb()
398 	skb_reserve(skb, hlen + sizeof(struct ipv6hdr));  in ndisc_alloc_skb()
399 	skb_reset_transport_header(skb);  in ndisc_alloc_skb()
404 	skb_set_owner_w(skb, sk);  in ndisc_alloc_skb()
406 	return skb;  in ndisc_alloc_skb()
409 static void ip6_nd_hdr(struct sk_buff *skb,  in ip6_nd_hdr()  argument
416 	skb_push(skb, sizeof(*hdr));  in ip6_nd_hdr()
417 	skb_reset_network_header(skb);  in ip6_nd_hdr()
418 	hdr = ipv6_hdr(skb);  in ip6_nd_hdr()
430 static void ndisc_send_skb(struct sk_buff *skb,  in ndisc_send_skb()  argument
434 	struct dst_entry *dst = skb_dst(skb);  in ndisc_send_skb()
435 	struct net *net = dev_net(skb->dev);  in ndisc_send_skb()
439 	struct icmp6hdr *icmp6h = icmp6_hdr(skb);  in ndisc_send_skb()
446 		int oif = l3mdev_fib_oif(skb->dev);  in ndisc_send_skb()
449 		if (oif != skb->dev->ifindex)  in ndisc_send_skb()
451 		dst = icmp6_dst_alloc(skb->dev, &fl6);  in ndisc_send_skb()
453 			kfree_skb(skb);  in ndisc_send_skb()
457 		skb_dst_set(skb, dst);  in ndisc_send_skb()
460 	icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, skb->len,  in ndisc_send_skb()
463 							   skb->len, 0));  in ndisc_send_skb()
465 	ip6_nd_hdr(skb, saddr, daddr, inet6_sk(sk)->hop_limit, skb->len);  in ndisc_send_skb()
469 	IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);  in ndisc_send_skb()
472 		      net, sk, skb, NULL, dst->dev,  in ndisc_send_skb()
486 	struct sk_buff *skb;  in ndisc_send_na()  local
514 	skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);  in ndisc_send_na()
515 	if (!skb)  in ndisc_send_na()
518 	msg = (struct nd_msg *)skb_put(skb, sizeof(*msg));  in ndisc_send_na()
530 		ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR,  in ndisc_send_na()
534 	ndisc_send_skb(skb, daddr, src_addr);  in ndisc_send_na()
561 	struct sk_buff *skb;  in ndisc_send_ns()  local
579 	skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);  in ndisc_send_ns()
580 	if (!skb)  in ndisc_send_ns()
583 	msg = (struct nd_msg *)skb_put(skb, sizeof(*msg));  in ndisc_send_ns()
592 		ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR,  in ndisc_send_ns()
595 	ndisc_send_skb(skb, daddr, saddr);  in ndisc_send_ns()
601 	struct sk_buff *skb;  in ndisc_send_rs()  local
631 	skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);  in ndisc_send_rs()
632 	if (!skb)  in ndisc_send_rs()
635 	msg = (struct rs_msg *)skb_put(skb, sizeof(*msg));  in ndisc_send_rs()
643 		ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR,  in ndisc_send_rs()
646 	ndisc_send_skb(skb, daddr, saddr);  in ndisc_send_rs()
650 static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb)  in ndisc_error_report()  argument
656 	dst_link_failure(skb);  in ndisc_error_report()
657 	kfree_skb(skb);  in ndisc_error_report()
662 static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)  in ndisc_solicit()  argument
670 	if (skb && ipv6_chk_addr_and_flags(dev_net(dev), &ipv6_hdr(skb)->saddr,  in ndisc_solicit()
673 		saddr = &ipv6_hdr(skb)->saddr;  in ndisc_solicit()
705 static void ndisc_recv_ns(struct sk_buff *skb)  in ndisc_recv_ns()  argument
707 	struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);  in ndisc_recv_ns()
708 	const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;  in ndisc_recv_ns()
709 	const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;  in ndisc_recv_ns()
711 	u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +  in ndisc_recv_ns()
714 	struct net_device *dev = skb->dev;  in ndisc_recv_ns()
722 	if (skb->len < sizeof(struct nd_msg)) {  in ndisc_recv_ns()
818 			if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) &&  in ndisc_recv_ns()
819 			    skb->pkt_type != PACKET_HOST &&  in ndisc_recv_ns()
829 				struct sk_buff *n = skb_clone(skb, GFP_ATOMIC);  in ndisc_recv_ns()
876 static void ndisc_recv_na(struct sk_buff *skb)  in ndisc_recv_na()  argument
878 	struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);  in ndisc_recv_na()
879 	struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;  in ndisc_recv_na()
880 	const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;  in ndisc_recv_na()
882 	u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +  in ndisc_recv_na()
885 	struct net_device *dev = skb->dev;  in ndisc_recv_na()
889 	if (skb->len < sizeof(struct nd_msg)) {  in ndisc_recv_na()
919 		if (skb->pkt_type != PACKET_LOOPBACK  in ndisc_recv_na()
933 		if (skb->pkt_type != PACKET_LOOPBACK)  in ndisc_recv_na()
980 static void ndisc_recv_rs(struct sk_buff *skb)  in ndisc_recv_rs()  argument
982 	struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb);  in ndisc_recv_rs()
983 	unsigned long ndoptlen = skb->len - sizeof(*rs_msg);  in ndisc_recv_rs()
986 	const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;  in ndisc_recv_rs()
990 	if (skb->len < sizeof(*rs_msg))  in ndisc_recv_rs()
993 	idev = __in6_dev_get(skb->dev);  in ndisc_recv_rs()
1018 					     skb->dev);  in ndisc_recv_rs()
1023 	neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1);  in ndisc_recv_rs()
1038 	struct sk_buff *skb;  in ndisc_ra_useropt()  local
1047 	skb = nlmsg_new(msg_size, GFP_ATOMIC);  in ndisc_ra_useropt()
1048 	if (!skb) {  in ndisc_ra_useropt()
1053 	nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0);  in ndisc_ra_useropt()
1067 	if (nla_put_in6_addr(skb, NDUSEROPT_SRCADDR, &ipv6_hdr(ra)->saddr))  in ndisc_ra_useropt()
1069 	nlmsg_end(skb, nlh);  in ndisc_ra_useropt()
1071 	rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC);  in ndisc_ra_useropt()
1075 	nlmsg_free(skb);  in ndisc_ra_useropt()
1081 static void ndisc_router_discovery(struct sk_buff *skb)  in ndisc_router_discovery()  argument
1083 	struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);  in ndisc_router_discovery()
1096 	optlen = (skb_tail_pointer(skb) - skb_transport_header(skb)) -  in ndisc_router_discovery()
1101 		  __func__, skb->dev->name);  in ndisc_router_discovery()
1102 	if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {  in ndisc_router_discovery()
1112 	if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) {  in ndisc_router_discovery()
1122 	in6_dev = __in6_dev_get(skb->dev);  in ndisc_router_discovery()
1125 			  skb->dev->name);  in ndisc_router_discovery()
1137 			  __func__, skb->dev->name);  in ndisc_router_discovery()
1143 	if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) {  in ndisc_router_discovery()
1146 			  __func__, skb->dev->name);  in ndisc_router_discovery()
1177 			  __func__, skb->dev->name);  in ndisc_router_discovery()
1185 	    ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr,  in ndisc_router_discovery()
1189 			  skb->dev->name);  in ndisc_router_discovery()
1203 	rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev);  in ndisc_router_discovery()
1206 		neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr);  in ndisc_router_discovery()
1221 		  rt, lifetime, skb->dev->name);  in ndisc_router_discovery()
1225 		rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref);  in ndisc_router_discovery()
1233 		neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr);  in ndisc_router_discovery()
1310 		neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr,  in ndisc_router_discovery()
1311 				       skb->dev, 1);  in ndisc_router_discovery()
1316 						     skb->dev);  in ndisc_router_discovery()
1333 			  __func__, skb->dev->name);  in ndisc_router_discovery()
1339 	    ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr,  in ndisc_router_discovery()
1343 			  skb->dev->name);  in ndisc_router_discovery()
1354 			if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT &&  in ndisc_router_discovery()
1363 			rt6_route_rcv(skb->dev, (u8 *)p, (p->nd_opt_len) << 3,  in ndisc_router_discovery()
1364 				      &ipv6_hdr(skb)->saddr);  in ndisc_router_discovery()
1373 	if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) {  in ndisc_router_discovery()
1376 			  __func__, skb->dev->name);  in ndisc_router_discovery()
1386 			addrconf_prefix_rcv(skb->dev, (u8 *)p,  in ndisc_router_discovery()
1399 		if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) {  in ndisc_router_discovery()
1407 			rt6_mtu_change(skb->dev, mtu);  in ndisc_router_discovery()
1416 			ndisc_ra_useropt(skb, p);  in ndisc_router_discovery()
1429 static void ndisc_redirect_rcv(struct sk_buff *skb)  in ndisc_redirect_rcv()  argument
1433 	struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb);  in ndisc_redirect_rcv()
1434 	u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +  in ndisc_redirect_rcv()
1438 	switch (skb->ndisc_nodetype) {  in ndisc_redirect_rcv()
1447 	if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {  in ndisc_redirect_rcv()
1457 		ip6_redirect_no_header(skb, dev_net(skb->dev),  in ndisc_redirect_rcv()
1458 					skb->dev->ifindex, 0);  in ndisc_redirect_rcv()
1464 	if (!pskb_pull(skb, hdr - skb_transport_header(skb)))  in ndisc_redirect_rcv()
1467 	icmpv6_notify(skb, NDISC_REDIRECT, 0, 0);  in ndisc_redirect_rcv()
1470 static void ndisc_fill_redirect_hdr_option(struct sk_buff *skb,  in ndisc_fill_redirect_hdr_option()  argument
1474 	u8 *opt = skb_put(skb, rd_len);  in ndisc_fill_redirect_hdr_option()
1484 void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)  in ndisc_send_redirect()  argument
1486 	struct net_device *dev = skb->dev;  in ndisc_send_redirect()
1508 	if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) &&  in ndisc_send_redirect()
1516 			 &saddr_buf, &ipv6_hdr(skb)->saddr, oif);  in ndisc_send_redirect()
1518 	if (oif != skb->dev->ifindex)  in ndisc_send_redirect()
1537 	peer = inet_getpeer_v6(net->ipv6.peers, &ipv6_hdr(skb)->saddr, 1);  in ndisc_send_redirect()
1545 		struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target);  in ndisc_send_redirect()
1566 		       skb->len + 8);  in ndisc_send_redirect()
1580 		.dest = ipv6_hdr(skb)->daddr,  in ndisc_send_redirect()
1595 		ndisc_fill_redirect_hdr_option(buff, skb, rd_len);  in ndisc_send_redirect()
1598 	ndisc_send_skb(buff, &ipv6_hdr(skb)->saddr, &saddr_buf);  in ndisc_send_redirect()
1605 static void pndisc_redo(struct sk_buff *skb)  in pndisc_redo()  argument
1607 	ndisc_recv_ns(skb);  in pndisc_redo()
1608 	kfree_skb(skb);  in pndisc_redo()
1611 static bool ndisc_suppress_frag_ndisc(struct sk_buff *skb)  in ndisc_suppress_frag_ndisc()  argument
1613 	struct inet6_dev *idev = __in6_dev_get(skb->dev);  in ndisc_suppress_frag_ndisc()
1617 	if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED &&  in ndisc_suppress_frag_ndisc()
1625 int ndisc_rcv(struct sk_buff *skb)  in ndisc_rcv()  argument
1629 	if (ndisc_suppress_frag_ndisc(skb))  in ndisc_rcv()
1632 	if (skb_linearize(skb))  in ndisc_rcv()
1635 	msg = (struct nd_msg *)skb_transport_header(skb);  in ndisc_rcv()
1637 	__skb_push(skb, skb->data - skb_transport_header(skb));  in ndisc_rcv()
1639 	if (ipv6_hdr(skb)->hop_limit != 255) {  in ndisc_rcv()
1641 			  ipv6_hdr(skb)->hop_limit);  in ndisc_rcv()
1651 	memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb));  in ndisc_rcv()
1655 		ndisc_recv_ns(skb);  in ndisc_rcv()
1659 		ndisc_recv_na(skb);  in ndisc_rcv()
1663 		ndisc_recv_rs(skb);  in ndisc_rcv()
1667 		ndisc_router_discovery(skb);  in ndisc_rcv()
1671 		ndisc_redirect_rcv(skb);  in ndisc_rcv()