89 static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb);
90 static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb);
93 static void pndisc_redo(struct sk_buff *skb);
151 static void ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data)  in ndisc_fill_addr_option()  argument
153 	int pad   = ndisc_addr_option_pad(skb->dev->type);  in ndisc_fill_addr_option()
154 	int data_len = skb->dev->addr_len;  in ndisc_fill_addr_option()
155 	int space = ndisc_opt_addr_space(skb->dev);  in ndisc_fill_addr_option()
156 	u8 *opt = skb_put(skb, space);  in ndisc_fill_addr_option()
384 	struct sk_buff *skb;  in ndisc_alloc_skb()  local
386 	skb = alloc_skb(hlen + sizeof(struct ipv6hdr) + len + tlen, GFP_ATOMIC);  in ndisc_alloc_skb()
387 	if (!skb) {  in ndisc_alloc_skb()
393 	skb->protocol = htons(ETH_P_IPV6);  in ndisc_alloc_skb()
394 	skb->dev = dev;  in ndisc_alloc_skb()
396 	skb_reserve(skb, hlen + sizeof(struct ipv6hdr));  in ndisc_alloc_skb()
397 	skb_reset_transport_header(skb);  in ndisc_alloc_skb()
402 	skb_set_owner_w(skb, sk);  in ndisc_alloc_skb()
404 	return skb;  in ndisc_alloc_skb()
407 static void ip6_nd_hdr(struct sk_buff *skb,  in ip6_nd_hdr()  argument
414 	skb_push(skb, sizeof(*hdr));  in ip6_nd_hdr()
415 	skb_reset_network_header(skb);  in ip6_nd_hdr()
416 	hdr = ipv6_hdr(skb);  in ip6_nd_hdr()
428 static void ndisc_send_skb(struct sk_buff *skb,  in ndisc_send_skb()  argument
432 	struct dst_entry *dst = skb_dst(skb);  in ndisc_send_skb()
433 	struct net *net = dev_net(skb->dev);  in ndisc_send_skb()
437 	struct icmp6hdr *icmp6h = icmp6_hdr(skb);  in ndisc_send_skb()
445 		icmpv6_flow_init(sk, &fl6, type, saddr, daddr, skb->dev->ifindex);  in ndisc_send_skb()
446 		dst = icmp6_dst_alloc(skb->dev, &fl6);  in ndisc_send_skb()
448 			kfree_skb(skb);  in ndisc_send_skb()
452 		skb_dst_set(skb, dst);  in ndisc_send_skb()
455 	icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, skb->len,  in ndisc_send_skb()
458 							   skb->len, 0));  in ndisc_send_skb()
460 	ip6_nd_hdr(skb, saddr, daddr, inet6_sk(sk)->hop_limit, skb->len);  in ndisc_send_skb()
464 	IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);  in ndisc_send_skb()
466 	err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, sk, skb,  in ndisc_send_skb()
482 	struct sk_buff *skb;  in ndisc_send_na()  local
510 	skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);  in ndisc_send_na()
511 	if (!skb)  in ndisc_send_na()
514 	msg = (struct nd_msg *)skb_put(skb, sizeof(*msg));  in ndisc_send_na()
526 		ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR,  in ndisc_send_na()
530 	ndisc_send_skb(skb, daddr, src_addr);  in ndisc_send_na()
558 	struct sk_buff *skb;  in ndisc_send_ns()  local
576 	skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);  in ndisc_send_ns()
577 	if (!skb)  in ndisc_send_ns()
580 	msg = (struct nd_msg *)skb_put(skb, sizeof(*msg));  in ndisc_send_ns()
589 		ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR,  in ndisc_send_ns()
592 	ndisc_send_skb(skb, daddr, saddr);  in ndisc_send_ns()
598 	struct sk_buff *skb;  in ndisc_send_rs()  local
628 	skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);  in ndisc_send_rs()
629 	if (!skb)  in ndisc_send_rs()
632 	msg = (struct rs_msg *)skb_put(skb, sizeof(*msg));  in ndisc_send_rs()
640 		ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR,  in ndisc_send_rs()
643 	ndisc_send_skb(skb, daddr, saddr);  in ndisc_send_rs()
647 static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb)  in ndisc_error_report()  argument
653 	dst_link_failure(skb);  in ndisc_error_report()
654 	kfree_skb(skb);  in ndisc_error_report()
659 static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)  in ndisc_solicit()  argument
667 	if (skb && ipv6_chk_addr_and_flags(dev_net(dev), &ipv6_hdr(skb)->saddr,  in ndisc_solicit()
670 		saddr = &ipv6_hdr(skb)->saddr;  in ndisc_solicit()
702 static void ndisc_recv_ns(struct sk_buff *skb)  in ndisc_recv_ns()  argument
704 	struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);  in ndisc_recv_ns()
705 	const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;  in ndisc_recv_ns()
706 	const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;  in ndisc_recv_ns()
708 	u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +  in ndisc_recv_ns()
711 	struct net_device *dev = skb->dev;  in ndisc_recv_ns()
719 	if (skb->len < sizeof(struct nd_msg)) {  in ndisc_recv_ns()
803 			if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) &&  in ndisc_recv_ns()
804 			    skb->pkt_type != PACKET_HOST &&  in ndisc_recv_ns()
814 				struct sk_buff *n = skb_clone(skb, GFP_ATOMIC);  in ndisc_recv_ns()
862 static void ndisc_recv_na(struct sk_buff *skb)  in ndisc_recv_na()  argument
864 	struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);  in ndisc_recv_na()
865 	struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;  in ndisc_recv_na()
866 	const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;  in ndisc_recv_na()
868 	u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +  in ndisc_recv_na()
871 	struct net_device *dev = skb->dev;  in ndisc_recv_na()
875 	if (skb->len < sizeof(struct nd_msg)) {  in ndisc_recv_na()
905 		if (skb->pkt_type != PACKET_LOOPBACK  in ndisc_recv_na()
919 		if (skb->pkt_type != PACKET_LOOPBACK)  in ndisc_recv_na()
966 static void ndisc_recv_rs(struct sk_buff *skb)  in ndisc_recv_rs()  argument
968 	struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb);  in ndisc_recv_rs()
969 	unsigned long ndoptlen = skb->len - sizeof(*rs_msg);  in ndisc_recv_rs()
972 	const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;  in ndisc_recv_rs()
976 	if (skb->len < sizeof(*rs_msg))  in ndisc_recv_rs()
979 	idev = __in6_dev_get(skb->dev);  in ndisc_recv_rs()
1004 					     skb->dev);  in ndisc_recv_rs()
1009 	neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1);  in ndisc_recv_rs()
1024 	struct sk_buff *skb;  in ndisc_ra_useropt()  local
1033 	skb = nlmsg_new(msg_size, GFP_ATOMIC);  in ndisc_ra_useropt()
1034 	if (!skb) {  in ndisc_ra_useropt()
1039 	nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0);  in ndisc_ra_useropt()
1053 	if (nla_put_in6_addr(skb, NDUSEROPT_SRCADDR, &ipv6_hdr(ra)->saddr))  in ndisc_ra_useropt()
1055 	nlmsg_end(skb, nlh);  in ndisc_ra_useropt()
1057 	rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC);  in ndisc_ra_useropt()
1061 	nlmsg_free(skb);  in ndisc_ra_useropt()
1067 static void ndisc_router_discovery(struct sk_buff *skb)  in ndisc_router_discovery()  argument
1069 	struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);  in ndisc_router_discovery()
1080 	optlen = (skb_tail_pointer(skb) - skb_transport_header(skb)) -  in ndisc_router_discovery()
1085 		  __func__, skb->dev->name);  in ndisc_router_discovery()
1086 	if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {  in ndisc_router_discovery()
1096 	if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) {  in ndisc_router_discovery()
1106 	in6_dev = __in6_dev_get(skb->dev);  in ndisc_router_discovery()
1109 			  skb->dev->name);  in ndisc_router_discovery()
1121 			  __func__, skb->dev->name);  in ndisc_router_discovery()
1127 	if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) {  in ndisc_router_discovery()
1130 			  __func__, skb->dev->name);  in ndisc_router_discovery()
1157 			  __func__, skb->dev->name);  in ndisc_router_discovery()
1165 	    ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr,  in ndisc_router_discovery()
1169 			  skb->dev->name);  in ndisc_router_discovery()
1183 	rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev);  in ndisc_router_discovery()
1186 		neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr);  in ndisc_router_discovery()
1201 		  rt, lifetime, skb->dev->name);  in ndisc_router_discovery()
1205 		rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref);  in ndisc_router_discovery()
1213 		neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr);  in ndisc_router_discovery()
1284 		neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr,  in ndisc_router_discovery()
1285 				       skb->dev, 1);  in ndisc_router_discovery()
1290 						     skb->dev);  in ndisc_router_discovery()
1307 			  __func__, skb->dev->name);  in ndisc_router_discovery()
1313 	    ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr,  in ndisc_router_discovery()
1317 			  skb->dev->name);  in ndisc_router_discovery()
1328 			if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT &&  in ndisc_router_discovery()
1337 			rt6_route_rcv(skb->dev, (u8 *)p, (p->nd_opt_len) << 3,  in ndisc_router_discovery()
1338 				      &ipv6_hdr(skb)->saddr);  in ndisc_router_discovery()
1347 	if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) {  in ndisc_router_discovery()
1350 			  __func__, skb->dev->name);  in ndisc_router_discovery()
1360 			addrconf_prefix_rcv(skb->dev, (u8 *)p,  in ndisc_router_discovery()
1373 		if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) {  in ndisc_router_discovery()
1381 			rt6_mtu_change(skb->dev, mtu);  in ndisc_router_discovery()
1390 			ndisc_ra_useropt(skb, p);  in ndisc_router_discovery()
1403 static void ndisc_redirect_rcv(struct sk_buff *skb)  in ndisc_redirect_rcv()  argument
1407 	struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb);  in ndisc_redirect_rcv()
1408 	u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +  in ndisc_redirect_rcv()
1412 	switch (skb->ndisc_nodetype) {  in ndisc_redirect_rcv()
1421 	if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {  in ndisc_redirect_rcv()
1431 		ip6_redirect_no_header(skb, dev_net(skb->dev),  in ndisc_redirect_rcv()
1432 					skb->dev->ifindex, 0);  in ndisc_redirect_rcv()
1438 	if (!pskb_pull(skb, hdr - skb_transport_header(skb)))  in ndisc_redirect_rcv()
1441 	icmpv6_notify(skb, NDISC_REDIRECT, 0, 0);  in ndisc_redirect_rcv()
1444 static void ndisc_fill_redirect_hdr_option(struct sk_buff *skb,  in ndisc_fill_redirect_hdr_option()  argument
1448 	u8 *opt = skb_put(skb, rd_len);  in ndisc_fill_redirect_hdr_option()
1458 void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)  in ndisc_send_redirect()  argument
1460 	struct net_device *dev = skb->dev;  in ndisc_send_redirect()
1481 	if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) &&  in ndisc_send_redirect()
1489 			 &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex);  in ndisc_send_redirect()
1515 		struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target);  in ndisc_send_redirect()
1536 		       skb->len + 8);  in ndisc_send_redirect()
1550 		.dest = ipv6_hdr(skb)->daddr,  in ndisc_send_redirect()
1565 		ndisc_fill_redirect_hdr_option(buff, skb, rd_len);  in ndisc_send_redirect()
1568 	ndisc_send_skb(buff, &ipv6_hdr(skb)->saddr, &saddr_buf);  in ndisc_send_redirect()
1575 static void pndisc_redo(struct sk_buff *skb)  in pndisc_redo()  argument
1577 	ndisc_recv_ns(skb);  in pndisc_redo()
1578 	kfree_skb(skb);  in pndisc_redo()
1581 static bool ndisc_suppress_frag_ndisc(struct sk_buff *skb)  in ndisc_suppress_frag_ndisc()  argument
1583 	struct inet6_dev *idev = __in6_dev_get(skb->dev);  in ndisc_suppress_frag_ndisc()
1587 	if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED &&  in ndisc_suppress_frag_ndisc()
1595 int ndisc_rcv(struct sk_buff *skb)  in ndisc_rcv()  argument
1599 	if (ndisc_suppress_frag_ndisc(skb))  in ndisc_rcv()
1602 	if (skb_linearize(skb))  in ndisc_rcv()
1605 	msg = (struct nd_msg *)skb_transport_header(skb);  in ndisc_rcv()
1607 	__skb_push(skb, skb->data - skb_transport_header(skb));  in ndisc_rcv()
1609 	if (ipv6_hdr(skb)->hop_limit != 255) {  in ndisc_rcv()
1611 			  ipv6_hdr(skb)->hop_limit);  in ndisc_rcv()
1621 	memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb));  in ndisc_rcv()
1625 		ndisc_recv_ns(skb);  in ndisc_rcv()
1629 		ndisc_recv_na(skb);  in ndisc_rcv()
1633 		ndisc_recv_rs(skb);  in ndisc_rcv()
1637 		ndisc_router_discovery(skb);  in ndisc_rcv()
1641 		ndisc_redirect_rcv(skb);  in ndisc_rcv()