xref: /openbmc/linux/net/ipv6/icmp.c (revision 30c89bad)
12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
21da177e4SLinus Torvalds /*
31da177e4SLinus Torvalds  *	Internet Control Message Protocol (ICMPv6)
41da177e4SLinus Torvalds  *	Linux INET6 implementation
51da177e4SLinus Torvalds  *
61da177e4SLinus Torvalds  *	Authors:
71da177e4SLinus Torvalds  *	Pedro Roque		<roque@di.fc.ul.pt>
81da177e4SLinus Torvalds  *
91da177e4SLinus Torvalds  *	Based on net/ipv4/icmp.c
101da177e4SLinus Torvalds  *
111da177e4SLinus Torvalds  *	RFC 1885
121da177e4SLinus Torvalds  */
131da177e4SLinus Torvalds 
141da177e4SLinus Torvalds /*
151da177e4SLinus Torvalds  *	Changes:
161da177e4SLinus Torvalds  *
171da177e4SLinus Torvalds  *	Andi Kleen		:	exception handling
181da177e4SLinus Torvalds  *	Andi Kleen			add rate limits. never reply to a icmp.
191da177e4SLinus Torvalds  *					add more length checks and other fixes.
201da177e4SLinus Torvalds  *	yoshfuji		:	ensure to sent parameter problem for
211da177e4SLinus Torvalds  *					fragments.
221da177e4SLinus Torvalds  *	YOSHIFUJI Hideaki @USAGI:	added sysctl for icmp rate limit.
231da177e4SLinus Torvalds  *	Randy Dunlap and
241da177e4SLinus Torvalds  *	YOSHIFUJI Hideaki @USAGI:	Per-interface statistics support
251da177e4SLinus Torvalds  *	Kazunori MIYAZAWA @USAGI:       change output process to use ip6_append_data
261da177e4SLinus Torvalds  */
271da177e4SLinus Torvalds 
28f3213831SJoe Perches #define pr_fmt(fmt) "IPv6: " fmt
29f3213831SJoe Perches 
301da177e4SLinus Torvalds #include <linux/module.h>
311da177e4SLinus Torvalds #include <linux/errno.h>
321da177e4SLinus Torvalds #include <linux/types.h>
331da177e4SLinus Torvalds #include <linux/socket.h>
341da177e4SLinus Torvalds #include <linux/in.h>
351da177e4SLinus Torvalds #include <linux/kernel.h>
361da177e4SLinus Torvalds #include <linux/sockios.h>
371da177e4SLinus Torvalds #include <linux/net.h>
381da177e4SLinus Torvalds #include <linux/skbuff.h>
391da177e4SLinus Torvalds #include <linux/init.h>
40763ecff1SYasuyuki Kozakai #include <linux/netfilter.h>
415a0e3ad6STejun Heo #include <linux/slab.h>
421da177e4SLinus Torvalds 
431da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL
441da177e4SLinus Torvalds #include <linux/sysctl.h>
451da177e4SLinus Torvalds #endif
461da177e4SLinus Torvalds 
471da177e4SLinus Torvalds #include <linux/inet.h>
481da177e4SLinus Torvalds #include <linux/netdevice.h>
491da177e4SLinus Torvalds #include <linux/icmpv6.h>
501da177e4SLinus Torvalds 
511da177e4SLinus Torvalds #include <net/ip.h>
521da177e4SLinus Torvalds #include <net/sock.h>
531da177e4SLinus Torvalds 
541da177e4SLinus Torvalds #include <net/ipv6.h>
551da177e4SLinus Torvalds #include <net/ip6_checksum.h>
566d0bfe22SLorenzo Colitti #include <net/ping.h>
571da177e4SLinus Torvalds #include <net/protocol.h>
581da177e4SLinus Torvalds #include <net/raw.h>
591da177e4SLinus Torvalds #include <net/rawv6.h>
60e4129440SAndrew Lunn #include <net/seg6.h>
611da177e4SLinus Torvalds #include <net/transp_v6.h>
621da177e4SLinus Torvalds #include <net/ip6_route.h>
631da177e4SLinus Torvalds #include <net/addrconf.h>
641da177e4SLinus Torvalds #include <net/icmp.h>
658b7817f3SHerbert Xu #include <net/xfrm.h>
661ed8516fSDenis V. Lunev #include <net/inet_common.h>
67825edac4SHannes Frederic Sowa #include <net/dsfield.h>
68ca254490SDavid Ahern #include <net/l3mdev.h>
691da177e4SLinus Torvalds 
707c0f6ba6SLinus Torvalds #include <linux/uaccess.h>
711da177e4SLinus Torvalds 
726a17b961SEric Dumazet static DEFINE_PER_CPU(struct sock *, ipv6_icmp_sk);
731da177e4SLinus Torvalds 
7432bbd879SStefano Brivio static int icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
756f809da2SSteffen Klassert 		       u8 type, u8 code, int offset, __be32 info)
766f809da2SSteffen Klassert {
776d0bfe22SLorenzo Colitti 	/* icmpv6_notify checks 8 bytes can be pulled, icmp6hdr is 8 bytes */
786d0bfe22SLorenzo Colitti 	struct icmp6hdr *icmp6 = (struct icmp6hdr *) (skb->data + offset);
796f809da2SSteffen Klassert 	struct net *net = dev_net(skb->dev);
806f809da2SSteffen Klassert 
816f809da2SSteffen Klassert 	if (type == ICMPV6_PKT_TOOBIG)
825f379ef5SGeorg Kohmann 		ip6_update_pmtu(skb, net, info, skb->dev->ifindex, 0, sock_net_uid(net, NULL));
836f809da2SSteffen Klassert 	else if (type == NDISC_REDIRECT)
84e2d118a1SLorenzo Colitti 		ip6_redirect(skb, net, skb->dev->ifindex, 0,
85e2d118a1SLorenzo Colitti 			     sock_net_uid(net, NULL));
866d0bfe22SLorenzo Colitti 
876d0bfe22SLorenzo Colitti 	if (!(type & ICMPV6_INFOMSG_MASK))
886d0bfe22SLorenzo Colitti 		if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST)
89dcb94b88SHannes Frederic Sowa 			ping_err(skb, offset, ntohl(info));
9032bbd879SStefano Brivio 
9132bbd879SStefano Brivio 	return 0;
926f809da2SSteffen Klassert }
936f809da2SSteffen Klassert 
94e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb);
951da177e4SLinus Torvalds 
9641135cc8SAlexey Dobriyan static const struct inet6_protocol icmpv6_protocol = {
971da177e4SLinus Torvalds 	.handler	=	icmpv6_rcv,
986f809da2SSteffen Klassert 	.err_handler	=	icmpv6_err,
998b7817f3SHerbert Xu 	.flags		=	INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1001da177e4SLinus Torvalds };
1011da177e4SLinus Torvalds 
1027ba91ecbSJesper Dangaard Brouer /* Called with BH disabled */
1036a17b961SEric Dumazet static struct sock *icmpv6_xmit_lock(struct net *net)
1041da177e4SLinus Torvalds {
105fdc0bde9SDenis V. Lunev 	struct sock *sk;
106fdc0bde9SDenis V. Lunev 
1076a17b961SEric Dumazet 	sk = this_cpu_read(ipv6_icmp_sk);
108405666dbSDenis V. Lunev 	if (unlikely(!spin_trylock(&sk->sk_lock.slock))) {
1091da177e4SLinus Torvalds 		/* This can happen if the output path (f.e. SIT or
1101da177e4SLinus Torvalds 		 * ip6ip6 tunnel) signals dst_link_failure() for an
1111da177e4SLinus Torvalds 		 * outgoing ICMP6 packet.
1121da177e4SLinus Torvalds 		 */
113fdc0bde9SDenis V. Lunev 		return NULL;
1141da177e4SLinus Torvalds 	}
1156a17b961SEric Dumazet 	sock_net_set(sk, net);
116fdc0bde9SDenis V. Lunev 	return sk;
1171da177e4SLinus Torvalds }
1181da177e4SLinus Torvalds 
1196a17b961SEric Dumazet static void icmpv6_xmit_unlock(struct sock *sk)
1201da177e4SLinus Torvalds {
1216a17b961SEric Dumazet 	sock_net_set(sk, &init_net);
1227ba91ecbSJesper Dangaard Brouer 	spin_unlock(&sk->sk_lock.slock);
1231da177e4SLinus Torvalds }
1241da177e4SLinus Torvalds 
1251da177e4SLinus Torvalds /*
1261da177e4SLinus Torvalds  * Figure out, may we reply to this packet with icmp error.
1271da177e4SLinus Torvalds  *
1281da177e4SLinus Torvalds  * We do not reply, if:
1291da177e4SLinus Torvalds  *	- it was icmp error message.
1301da177e4SLinus Torvalds  *	- it is truncated, so that it is known, that protocol is ICMPV6
1311da177e4SLinus Torvalds  *	  (i.e. in the middle of some exthdr)
1321da177e4SLinus Torvalds  *
1331da177e4SLinus Torvalds  *	--ANK (980726)
1341da177e4SLinus Torvalds  */
1351da177e4SLinus Torvalds 
136a50feda5SEric Dumazet static bool is_ineligible(const struct sk_buff *skb)
1371da177e4SLinus Torvalds {
1380660e03fSArnaldo Carvalho de Melo 	int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data;
1391da177e4SLinus Torvalds 	int len = skb->len - ptr;
1400660e03fSArnaldo Carvalho de Melo 	__u8 nexthdr = ipv6_hdr(skb)->nexthdr;
14175f2811cSJesse Gross 	__be16 frag_off;
1421da177e4SLinus Torvalds 
1431da177e4SLinus Torvalds 	if (len < 0)
144a50feda5SEric Dumazet 		return true;
1451da177e4SLinus Torvalds 
14675f2811cSJesse Gross 	ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off);
1471da177e4SLinus Torvalds 	if (ptr < 0)
148a50feda5SEric Dumazet 		return false;
1491da177e4SLinus Torvalds 	if (nexthdr == IPPROTO_ICMPV6) {
1501da177e4SLinus Torvalds 		u8 _type, *tp;
1511da177e4SLinus Torvalds 		tp = skb_header_pointer(skb,
1521da177e4SLinus Torvalds 			ptr+offsetof(struct icmp6hdr, icmp6_type),
1531da177e4SLinus Torvalds 			sizeof(_type), &_type);
1542efdaaafSHangbin Liu 
1552efdaaafSHangbin Liu 		/* Based on RFC 8200, Section 4.5 Fragment Header, return
1562efdaaafSHangbin Liu 		 * false if this is a fragment packet with no icmp header info.
1572efdaaafSHangbin Liu 		 */
1582efdaaafSHangbin Liu 		if (!tp && frag_off != 0)
1592efdaaafSHangbin Liu 			return false;
1602efdaaafSHangbin Liu 		else if (!tp || !(*tp & ICMPV6_INFOMSG_MASK))
161a50feda5SEric Dumazet 			return true;
1621da177e4SLinus Torvalds 	}
163a50feda5SEric Dumazet 	return false;
1641da177e4SLinus Torvalds }
1651da177e4SLinus Torvalds 
1660bc19985SStephen Suryaputra static bool icmpv6_mask_allow(struct net *net, int type)
167c0303efeSJesper Dangaard Brouer {
1680bc19985SStephen Suryaputra 	if (type > ICMPV6_MSG_MAX)
169c0303efeSJesper Dangaard Brouer 		return true;
170c0303efeSJesper Dangaard Brouer 
1710bc19985SStephen Suryaputra 	/* Limit if icmp type is set in ratemask. */
1720bc19985SStephen Suryaputra 	if (!test_bit(type, net->ipv6.sysctl.icmpv6_ratemask))
173c0303efeSJesper Dangaard Brouer 		return true;
174c0303efeSJesper Dangaard Brouer 
175c0303efeSJesper Dangaard Brouer 	return false;
176c0303efeSJesper Dangaard Brouer }
177c0303efeSJesper Dangaard Brouer 
1780bc19985SStephen Suryaputra static bool icmpv6_global_allow(struct net *net, int type)
179c0303efeSJesper Dangaard Brouer {
1800bc19985SStephen Suryaputra 	if (icmpv6_mask_allow(net, type))
181c0303efeSJesper Dangaard Brouer 		return true;
182c0303efeSJesper Dangaard Brouer 
183c0303efeSJesper Dangaard Brouer 	if (icmp_global_allow())
184c0303efeSJesper Dangaard Brouer 		return true;
185c0303efeSJesper Dangaard Brouer 
186d0941130SJamie Bainbridge 	__ICMP_INC_STATS(net, ICMP_MIB_RATELIMITGLOBAL);
187c0303efeSJesper Dangaard Brouer 	return false;
188c0303efeSJesper Dangaard Brouer }
189c0303efeSJesper Dangaard Brouer 
1901da177e4SLinus Torvalds /*
1911da177e4SLinus Torvalds  * Check the ICMP output rate limit
1921da177e4SLinus Torvalds  */
1934cdf507dSEric Dumazet static bool icmpv6_xrlim_allow(struct sock *sk, u8 type,
1944c9483b2SDavid S. Miller 			       struct flowi6 *fl6)
1951da177e4SLinus Torvalds {
1963b1e0a65SYOSHIFUJI Hideaki 	struct net *net = sock_net(sk);
1974cdf507dSEric Dumazet 	struct dst_entry *dst;
19892d86829SDavid S. Miller 	bool res = false;
1991da177e4SLinus Torvalds 
2000bc19985SStephen Suryaputra 	if (icmpv6_mask_allow(net, type))
20192d86829SDavid S. Miller 		return true;
2021da177e4SLinus Torvalds 
2031da177e4SLinus Torvalds 	/*
2041da177e4SLinus Torvalds 	 * Look up the output route.
2051da177e4SLinus Torvalds 	 * XXX: perhaps the expire for routing entries cloned by
2061da177e4SLinus Torvalds 	 * this lookup should be more aggressive (not longer than timeout).
2071da177e4SLinus Torvalds 	 */
2084c9483b2SDavid S. Miller 	dst = ip6_route_output(net, sk, fl6);
2091da177e4SLinus Torvalds 	if (dst->error) {
2103bd653c8SDenis V. Lunev 		IP6_INC_STATS(net, ip6_dst_idev(dst),
211a11d206dSYOSHIFUJI Hideaki 			      IPSTATS_MIB_OUTNOROUTES);
2121da177e4SLinus Torvalds 	} else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) {
21392d86829SDavid S. Miller 		res = true;
2141da177e4SLinus Torvalds 	} else {
2151da177e4SLinus Torvalds 		struct rt6_info *rt = (struct rt6_info *)dst;
2169a43b709SBenjamin Thery 		int tmo = net->ipv6.sysctl.icmpv6_time;
217c0303efeSJesper Dangaard Brouer 		struct inet_peer *peer;
2181da177e4SLinus Torvalds 
2191da177e4SLinus Torvalds 		/* Give more bandwidth to wider prefixes. */
2201da177e4SLinus Torvalds 		if (rt->rt6i_dst.plen < 128)
2211da177e4SLinus Torvalds 			tmo >>= ((128 - rt->rt6i_dst.plen)>>5);
2221da177e4SLinus Torvalds 
223c0303efeSJesper Dangaard Brouer 		peer = inet_getpeer_v6(net->ipv6.peers, &fl6->daddr, 1);
224fbfe95a4SDavid S. Miller 		res = inet_peer_xrlim_allow(peer, tmo);
2251d861aa4SDavid S. Miller 		if (peer)
2261d861aa4SDavid S. Miller 			inet_putpeer(peer);
2271da177e4SLinus Torvalds 	}
228d0941130SJamie Bainbridge 	if (!res)
229d0941130SJamie Bainbridge 		__ICMP6_INC_STATS(net, ip6_dst_idev(dst),
230d0941130SJamie Bainbridge 				  ICMP6_MIB_RATELIMITHOST);
2311da177e4SLinus Torvalds 	dst_release(dst);
2321da177e4SLinus Torvalds 	return res;
2331da177e4SLinus Torvalds }
2341da177e4SLinus Torvalds 
235b93cfb9cSTim Stallard static bool icmpv6_rt_has_prefsrc(struct sock *sk, u8 type,
236b93cfb9cSTim Stallard 				  struct flowi6 *fl6)
237b93cfb9cSTim Stallard {
238b93cfb9cSTim Stallard 	struct net *net = sock_net(sk);
239b93cfb9cSTim Stallard 	struct dst_entry *dst;
240b93cfb9cSTim Stallard 	bool res = false;
241b93cfb9cSTim Stallard 
242b93cfb9cSTim Stallard 	dst = ip6_route_output(net, sk, fl6);
243b93cfb9cSTim Stallard 	if (!dst->error) {
244b93cfb9cSTim Stallard 		struct rt6_info *rt = (struct rt6_info *)dst;
245b93cfb9cSTim Stallard 		struct in6_addr prefsrc;
246b93cfb9cSTim Stallard 
247b93cfb9cSTim Stallard 		rt6_get_prefsrc(rt, &prefsrc);
248b93cfb9cSTim Stallard 		res = !ipv6_addr_any(&prefsrc);
249b93cfb9cSTim Stallard 	}
250b93cfb9cSTim Stallard 	dst_release(dst);
251b93cfb9cSTim Stallard 	return res;
252b93cfb9cSTim Stallard }
253b93cfb9cSTim Stallard 
2541da177e4SLinus Torvalds /*
2551da177e4SLinus Torvalds  *	an inline helper for the "simple" if statement below
2561da177e4SLinus Torvalds  *	checks if parameter problem report is caused by an
2571da177e4SLinus Torvalds  *	unrecognized IPv6 option that has the Option Type
2581da177e4SLinus Torvalds  *	highest-order two bits set to 10
2591da177e4SLinus Torvalds  */
2601da177e4SLinus Torvalds 
261a50feda5SEric Dumazet static bool opt_unrec(struct sk_buff *skb, __u32 offset)
2621da177e4SLinus Torvalds {
2631da177e4SLinus Torvalds 	u8 _optval, *op;
2641da177e4SLinus Torvalds 
265bbe735e4SArnaldo Carvalho de Melo 	offset += skb_network_offset(skb);
2661da177e4SLinus Torvalds 	op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval);
26763159f29SIan Morris 	if (!op)
268a50feda5SEric Dumazet 		return true;
2691da177e4SLinus Torvalds 	return (*op & 0xC0) == 0x80;
2701da177e4SLinus Torvalds }
2711da177e4SLinus Torvalds 
2724e64b1edSJoe Perches void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
2736d0bfe22SLorenzo Colitti 				struct icmp6hdr *thdr, int len)
2741da177e4SLinus Torvalds {
2751da177e4SLinus Torvalds 	struct sk_buff *skb;
2761da177e4SLinus Torvalds 	struct icmp6hdr *icmp6h;
2771da177e4SLinus Torvalds 
278e5d08d71SIan Morris 	skb = skb_peek(&sk->sk_write_queue);
27963159f29SIan Morris 	if (!skb)
2804e64b1edSJoe Perches 		return;
2811da177e4SLinus Torvalds 
282cc70ab26SArnaldo Carvalho de Melo 	icmp6h = icmp6_hdr(skb);
2831da177e4SLinus Torvalds 	memcpy(icmp6h, thdr, sizeof(struct icmp6hdr));
2841da177e4SLinus Torvalds 	icmp6h->icmp6_cksum = 0;
2851da177e4SLinus Torvalds 
2861da177e4SLinus Torvalds 	if (skb_queue_len(&sk->sk_write_queue) == 1) {
28707f0757aSJoe Perches 		skb->csum = csum_partial(icmp6h,
2881da177e4SLinus Torvalds 					sizeof(struct icmp6hdr), skb->csum);
2894c9483b2SDavid S. Miller 		icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr,
2904c9483b2SDavid S. Miller 						      &fl6->daddr,
2914c9483b2SDavid S. Miller 						      len, fl6->flowi6_proto,
2921da177e4SLinus Torvalds 						      skb->csum);
2931da177e4SLinus Torvalds 	} else {
294868c86bcSAl Viro 		__wsum tmp_csum = 0;
2951da177e4SLinus Torvalds 
2961da177e4SLinus Torvalds 		skb_queue_walk(&sk->sk_write_queue, skb) {
2971da177e4SLinus Torvalds 			tmp_csum = csum_add(tmp_csum, skb->csum);
2981da177e4SLinus Torvalds 		}
2991da177e4SLinus Torvalds 
30007f0757aSJoe Perches 		tmp_csum = csum_partial(icmp6h,
3011da177e4SLinus Torvalds 					sizeof(struct icmp6hdr), tmp_csum);
3024c9483b2SDavid S. Miller 		icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr,
3034c9483b2SDavid S. Miller 						      &fl6->daddr,
3044c9483b2SDavid S. Miller 						      len, fl6->flowi6_proto,
305868c86bcSAl Viro 						      tmp_csum);
3061da177e4SLinus Torvalds 	}
3071da177e4SLinus Torvalds 	ip6_push_pending_frames(sk);
3081da177e4SLinus Torvalds }
3091da177e4SLinus Torvalds 
3101da177e4SLinus Torvalds struct icmpv6_msg {
3111da177e4SLinus Torvalds 	struct sk_buff	*skb;
3121da177e4SLinus Torvalds 	int		offset;
313763ecff1SYasuyuki Kozakai 	uint8_t		type;
3141da177e4SLinus Torvalds };
3151da177e4SLinus Torvalds 
3161da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb)
3171da177e4SLinus Torvalds {
3181da177e4SLinus Torvalds 	struct icmpv6_msg *msg = (struct icmpv6_msg *) from;
3191da177e4SLinus Torvalds 	struct sk_buff *org_skb = msg->skb;
3208d5930dfSAl Viro 	__wsum csum;
3211da177e4SLinus Torvalds 
3221da177e4SLinus Torvalds 	csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset,
3238d5930dfSAl Viro 				      to, len);
3241da177e4SLinus Torvalds 	skb->csum = csum_block_add(skb->csum, csum, odd);
325763ecff1SYasuyuki Kozakai 	if (!(msg->type & ICMPV6_INFOMSG_MASK))
326763ecff1SYasuyuki Kozakai 		nf_ct_attach(skb, org_skb);
3271da177e4SLinus Torvalds 	return 0;
3281da177e4SLinus Torvalds }
3291da177e4SLinus Torvalds 
33007a93626SAmerigo Wang #if IS_ENABLED(CONFIG_IPV6_MIP6)
331ee576c47SJason A. Donenfeld static void mip6_addr_swap(struct sk_buff *skb, const struct inet6_skb_parm *opt)
33279383236SMasahide NAKAMURA {
3330660e03fSArnaldo Carvalho de Melo 	struct ipv6hdr *iph = ipv6_hdr(skb);
33479383236SMasahide NAKAMURA 	struct ipv6_destopt_hao *hao;
33579383236SMasahide NAKAMURA 	int off;
33679383236SMasahide NAKAMURA 
33779383236SMasahide NAKAMURA 	if (opt->dsthao) {
33879383236SMasahide NAKAMURA 		off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO);
33979383236SMasahide NAKAMURA 		if (likely(off >= 0)) {
340d56f90a7SArnaldo Carvalho de Melo 			hao = (struct ipv6_destopt_hao *)
341d56f90a7SArnaldo Carvalho de Melo 					(skb_network_header(skb) + off);
342bc617613SJiapeng Chong 			swap(iph->saddr, hao->addr);
34379383236SMasahide NAKAMURA 		}
34479383236SMasahide NAKAMURA 	}
34579383236SMasahide NAKAMURA }
34679383236SMasahide NAKAMURA #else
347ee576c47SJason A. Donenfeld static inline void mip6_addr_swap(struct sk_buff *skb, const struct inet6_skb_parm *opt) {}
34879383236SMasahide NAKAMURA #endif
34979383236SMasahide NAKAMURA 
350e8243534Sstephen hemminger static struct dst_entry *icmpv6_route_lookup(struct net *net,
351e8243534Sstephen hemminger 					     struct sk_buff *skb,
352e8243534Sstephen hemminger 					     struct sock *sk,
353e8243534Sstephen hemminger 					     struct flowi6 *fl6)
354b42835dbSDavid S. Miller {
355b42835dbSDavid S. Miller 	struct dst_entry *dst, *dst2;
3564c9483b2SDavid S. Miller 	struct flowi6 fl2;
357b42835dbSDavid S. Miller 	int err;
358b42835dbSDavid S. Miller 
359343d60aaSRoopa Prabhu 	err = ip6_dst_lookup(net, sk, &dst, fl6);
360b42835dbSDavid S. Miller 	if (err)
361b42835dbSDavid S. Miller 		return ERR_PTR(err);
362b42835dbSDavid S. Miller 
363b42835dbSDavid S. Miller 	/*
364b42835dbSDavid S. Miller 	 * We won't send icmp if the destination is known
365b42835dbSDavid S. Miller 	 * anycast.
366b42835dbSDavid S. Miller 	 */
3672647a9b0SMartin KaFai Lau 	if (ipv6_anycast_destination(dst, &fl6->daddr)) {
368ba7a46f1SJoe Perches 		net_dbg_ratelimited("icmp6_send: acast source\n");
369b42835dbSDavid S. Miller 		dst_release(dst);
370b42835dbSDavid S. Miller 		return ERR_PTR(-EINVAL);
371b42835dbSDavid S. Miller 	}
372b42835dbSDavid S. Miller 
373b42835dbSDavid S. Miller 	/* No need to clone since we're just using its address. */
374b42835dbSDavid S. Miller 	dst2 = dst;
375b42835dbSDavid S. Miller 
3764c9483b2SDavid S. Miller 	dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0);
377452edd59SDavid S. Miller 	if (!IS_ERR(dst)) {
378b42835dbSDavid S. Miller 		if (dst != dst2)
379b42835dbSDavid S. Miller 			return dst;
380452edd59SDavid S. Miller 	} else {
381452edd59SDavid S. Miller 		if (PTR_ERR(dst) == -EPERM)
382b42835dbSDavid S. Miller 			dst = NULL;
383452edd59SDavid S. Miller 		else
384452edd59SDavid S. Miller 			return dst;
385b42835dbSDavid S. Miller 	}
386b42835dbSDavid S. Miller 
3874c9483b2SDavid S. Miller 	err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6);
388b42835dbSDavid S. Miller 	if (err)
389b42835dbSDavid S. Miller 		goto relookup_failed;
390b42835dbSDavid S. Miller 
391343d60aaSRoopa Prabhu 	err = ip6_dst_lookup(net, sk, &dst2, &fl2);
392b42835dbSDavid S. Miller 	if (err)
393b42835dbSDavid S. Miller 		goto relookup_failed;
394b42835dbSDavid S. Miller 
3954c9483b2SDavid S. Miller 	dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP);
396452edd59SDavid S. Miller 	if (!IS_ERR(dst2)) {
397b42835dbSDavid S. Miller 		dst_release(dst);
398b42835dbSDavid S. Miller 		dst = dst2;
399452edd59SDavid S. Miller 	} else {
400452edd59SDavid S. Miller 		err = PTR_ERR(dst2);
401452edd59SDavid S. Miller 		if (err == -EPERM) {
402b42835dbSDavid S. Miller 			dst_release(dst);
403452edd59SDavid S. Miller 			return dst2;
404452edd59SDavid S. Miller 		} else
405b42835dbSDavid S. Miller 			goto relookup_failed;
406b42835dbSDavid S. Miller 	}
407b42835dbSDavid S. Miller 
408b42835dbSDavid S. Miller relookup_failed:
409b42835dbSDavid S. Miller 	if (dst)
410b42835dbSDavid S. Miller 		return dst;
411b42835dbSDavid S. Miller 	return ERR_PTR(err);
412b42835dbSDavid S. Miller }
413b42835dbSDavid S. Miller 
414e1ae5c2eSStephen Suryaputra static struct net_device *icmp6_dev(const struct sk_buff *skb)
4151b70d792SDavid Ahern {
416e1ae5c2eSStephen Suryaputra 	struct net_device *dev = skb->dev;
4171b70d792SDavid Ahern 
4181b70d792SDavid Ahern 	/* for local traffic to local address, skb dev is the loopback
4191b70d792SDavid Ahern 	 * device. Check if there is a dst attached to the skb and if so
42024b711edSDavid Ahern 	 * get the real device index. Same is needed for replies to a link
42124b711edSDavid Ahern 	 * local address on a device enslaved to an L3 master device
4221b70d792SDavid Ahern 	 */
423e1ae5c2eSStephen Suryaputra 	if (unlikely(dev->ifindex == LOOPBACK_IFINDEX || netif_is_l3_master(skb->dev))) {
4241b70d792SDavid Ahern 		const struct rt6_info *rt6 = skb_rt6_info(skb);
4251b70d792SDavid Ahern 
4261b70d792SDavid Ahern 		if (rt6)
427e1ae5c2eSStephen Suryaputra 			dev = rt6->rt6i_idev->dev;
4281b70d792SDavid Ahern 	}
4291b70d792SDavid Ahern 
430e1ae5c2eSStephen Suryaputra 	return dev;
431e1ae5c2eSStephen Suryaputra }
432e1ae5c2eSStephen Suryaputra 
433e1ae5c2eSStephen Suryaputra static int icmp6_iif(const struct sk_buff *skb)
434e1ae5c2eSStephen Suryaputra {
435e1ae5c2eSStephen Suryaputra 	return icmp6_dev(skb)->ifindex;
4361b70d792SDavid Ahern }
4371b70d792SDavid Ahern 
4381da177e4SLinus Torvalds /*
4391da177e4SLinus Torvalds  *	Send an ICMP message in response to a packet in error
4401da177e4SLinus Torvalds  */
441cc7a21b6SEric Dumazet void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info,
442ee576c47SJason A. Donenfeld 		const struct in6_addr *force_saddr,
443ee576c47SJason A. Donenfeld 		const struct inet6_skb_parm *parm)
4441da177e4SLinus Torvalds {
4451da177e4SLinus Torvalds 	struct inet6_dev *idev = NULL;
4460660e03fSArnaldo Carvalho de Melo 	struct ipv6hdr *hdr = ipv6_hdr(skb);
44784427d53SYOSHIFUJI Hideaki 	struct sock *sk;
4488d933670SEric Dumazet 	struct net *net;
44984427d53SYOSHIFUJI Hideaki 	struct ipv6_pinfo *np;
450b71d1d42SEric Dumazet 	const struct in6_addr *saddr = NULL;
4511da177e4SLinus Torvalds 	struct dst_entry *dst;
4521da177e4SLinus Torvalds 	struct icmp6hdr tmp_hdr;
4534c9483b2SDavid S. Miller 	struct flowi6 fl6;
4541da177e4SLinus Torvalds 	struct icmpv6_msg msg;
45526879da5SWei Wang 	struct ipcm6_cookie ipc6;
4561da177e4SLinus Torvalds 	int iif = 0;
4571da177e4SLinus Torvalds 	int addr_type = 0;
4581da177e4SLinus Torvalds 	int len;
4598d933670SEric Dumazet 	u32 mark;
4601da177e4SLinus Torvalds 
46127a884dcSArnaldo Carvalho de Melo 	if ((u8 *)hdr < skb->head ||
46229a3cad5SSimon Horman 	    (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb))
4631da177e4SLinus Torvalds 		return;
4641da177e4SLinus Torvalds 
4658d933670SEric Dumazet 	if (!skb->dev)
4668d933670SEric Dumazet 		return;
4678d933670SEric Dumazet 	net = dev_net(skb->dev);
4688d933670SEric Dumazet 	mark = IP6_REPLY_MARK(net, skb->mark);
4691da177e4SLinus Torvalds 	/*
4701da177e4SLinus Torvalds 	 *	Make sure we respect the rules
4711da177e4SLinus Torvalds 	 *	i.e. RFC 1885 2.4(e)
4725f5624cfSPravin B Shelar 	 *	Rule (e.1) is enforced by not using icmp6_send
4731da177e4SLinus Torvalds 	 *	in any code that processes icmp errors.
4741da177e4SLinus Torvalds 	 */
4751da177e4SLinus Torvalds 	addr_type = ipv6_addr_type(&hdr->daddr);
4761da177e4SLinus Torvalds 
477446fab59SFX Le Bail 	if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) ||
478d94c1f92SFX Le Bail 	    ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr))
4791da177e4SLinus Torvalds 		saddr = &hdr->daddr;
4801da177e4SLinus Torvalds 
4811da177e4SLinus Torvalds 	/*
4821da177e4SLinus Torvalds 	 *	Dest addr check
4831da177e4SLinus Torvalds 	 */
4841da177e4SLinus Torvalds 
4859a6b4b39Szhuyj 	if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) {
4861da177e4SLinus Torvalds 		if (type != ICMPV6_PKT_TOOBIG &&
4871da177e4SLinus Torvalds 		    !(type == ICMPV6_PARAMPROB &&
4881da177e4SLinus Torvalds 		      code == ICMPV6_UNK_OPTION &&
4891da177e4SLinus Torvalds 		      (opt_unrec(skb, info))))
4901da177e4SLinus Torvalds 			return;
4911da177e4SLinus Torvalds 
4921da177e4SLinus Torvalds 		saddr = NULL;
4931da177e4SLinus Torvalds 	}
4941da177e4SLinus Torvalds 
4951da177e4SLinus Torvalds 	addr_type = ipv6_addr_type(&hdr->saddr);
4961da177e4SLinus Torvalds 
4971da177e4SLinus Torvalds 	/*
4981da177e4SLinus Torvalds 	 *	Source addr check
4991da177e4SLinus Torvalds 	 */
5001da177e4SLinus Torvalds 
5014832c30dSDavid Ahern 	if (__ipv6_addr_needs_scope_id(addr_type)) {
5021b70d792SDavid Ahern 		iif = icmp6_iif(skb);
5034832c30dSDavid Ahern 	} else {
504272928d1SMathieu Desnoyers 		/*
505272928d1SMathieu Desnoyers 		 * The source device is used for looking up which routing table
506272928d1SMathieu Desnoyers 		 * to use for sending an ICMP error.
507272928d1SMathieu Desnoyers 		 */
508272928d1SMathieu Desnoyers 		iif = l3mdev_master_ifindex(skb->dev);
50979dc7e3fSDavid Ahern 	}
5101da177e4SLinus Torvalds 
5111da177e4SLinus Torvalds 	/*
5128de3351eSYOSHIFUJI Hideaki 	 *	Must not send error if the source does not uniquely
5138de3351eSYOSHIFUJI Hideaki 	 *	identify a single node (RFC2463 Section 2.4).
5148de3351eSYOSHIFUJI Hideaki 	 *	We check unspecified / multicast addresses here,
5158de3351eSYOSHIFUJI Hideaki 	 *	and anycast addresses will be checked later.
5161da177e4SLinus Torvalds 	 */
5171da177e4SLinus Torvalds 	if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) {
5184b3418fbSBjørn Mork 		net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n",
5194b3418fbSBjørn Mork 				    &hdr->saddr, &hdr->daddr);
5201da177e4SLinus Torvalds 		return;
5211da177e4SLinus Torvalds 	}
5221da177e4SLinus Torvalds 
5231da177e4SLinus Torvalds 	/*
5241da177e4SLinus Torvalds 	 *	Never answer to a ICMP packet.
5251da177e4SLinus Torvalds 	 */
5261da177e4SLinus Torvalds 	if (is_ineligible(skb)) {
5274b3418fbSBjørn Mork 		net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n",
5284b3418fbSBjørn Mork 				    &hdr->saddr, &hdr->daddr);
5291da177e4SLinus Torvalds 		return;
5301da177e4SLinus Torvalds 	}
5311da177e4SLinus Torvalds 
5327ba91ecbSJesper Dangaard Brouer 	/* Needed by both icmp_global_allow and icmpv6_xmit_lock */
5337ba91ecbSJesper Dangaard Brouer 	local_bh_disable();
5347ba91ecbSJesper Dangaard Brouer 
5357ba91ecbSJesper Dangaard Brouer 	/* Check global sysctl_icmp_msgs_per_sec ratelimit */
5360bc19985SStephen Suryaputra 	if (!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, type))
5377ba91ecbSJesper Dangaard Brouer 		goto out_bh_enable;
5387ba91ecbSJesper Dangaard Brouer 
539ee576c47SJason A. Donenfeld 	mip6_addr_swap(skb, parm);
54079383236SMasahide NAKAMURA 
541fac6fce9SFrancesco Ruggeri 	sk = icmpv6_xmit_lock(net);
542fac6fce9SFrancesco Ruggeri 	if (!sk)
543fac6fce9SFrancesco Ruggeri 		goto out_bh_enable;
544fac6fce9SFrancesco Ruggeri 
5454c9483b2SDavid S. Miller 	memset(&fl6, 0, sizeof(fl6));
5464c9483b2SDavid S. Miller 	fl6.flowi6_proto = IPPROTO_ICMPV6;
5474e3fd7a0SAlexey Dobriyan 	fl6.daddr = hdr->saddr;
548b1cadc1aSEric Dumazet 	if (force_saddr)
549b1cadc1aSEric Dumazet 		saddr = force_saddr;
550fac6fce9SFrancesco Ruggeri 	if (saddr) {
5514e3fd7a0SAlexey Dobriyan 		fl6.saddr = *saddr;
552b93cfb9cSTim Stallard 	} else if (!icmpv6_rt_has_prefsrc(sk, type, &fl6)) {
553fac6fce9SFrancesco Ruggeri 		/* select a more meaningful saddr from input if */
554fac6fce9SFrancesco Ruggeri 		struct net_device *in_netdev;
555fac6fce9SFrancesco Ruggeri 
556ee576c47SJason A. Donenfeld 		in_netdev = dev_get_by_index(net, parm->iif);
557fac6fce9SFrancesco Ruggeri 		if (in_netdev) {
558fac6fce9SFrancesco Ruggeri 			ipv6_dev_get_saddr(net, in_netdev, &fl6.daddr,
559fac6fce9SFrancesco Ruggeri 					   inet6_sk(sk)->srcprefs,
560fac6fce9SFrancesco Ruggeri 					   &fl6.saddr);
561fac6fce9SFrancesco Ruggeri 			dev_put(in_netdev);
562fac6fce9SFrancesco Ruggeri 		}
563fac6fce9SFrancesco Ruggeri 	}
564e110861fSLorenzo Colitti 	fl6.flowi6_mark = mark;
5654c9483b2SDavid S. Miller 	fl6.flowi6_oif = iif;
5661958b856SDavid S. Miller 	fl6.fl6_icmp_type = type;
5671958b856SDavid S. Miller 	fl6.fl6_icmp_code = code;
568e2d118a1SLorenzo Colitti 	fl6.flowi6_uid = sock_net_uid(net, NULL);
569b4bac172SDavid Ahern 	fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, NULL);
5703df98d79SPaul Moore 	security_skb_classify_flow(skb, flowi6_to_flowi_common(&fl6));
5711da177e4SLinus Torvalds 
572fdc0bde9SDenis V. Lunev 	np = inet6_sk(sk);
573405666dbSDenis V. Lunev 
5744c9483b2SDavid S. Miller 	if (!icmpv6_xrlim_allow(sk, type, &fl6))
5751da177e4SLinus Torvalds 		goto out;
5761da177e4SLinus Torvalds 
5771da177e4SLinus Torvalds 	tmp_hdr.icmp6_type = type;
5781da177e4SLinus Torvalds 	tmp_hdr.icmp6_code = code;
5791da177e4SLinus Torvalds 	tmp_hdr.icmp6_cksum = 0;
5801da177e4SLinus Torvalds 	tmp_hdr.icmp6_pointer = htonl(info);
5811da177e4SLinus Torvalds 
5824c9483b2SDavid S. Miller 	if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
5834c9483b2SDavid S. Miller 		fl6.flowi6_oif = np->mcast_oif;
584c4062dfcSErich E. Hoover 	else if (!fl6.flowi6_oif)
585c4062dfcSErich E. Hoover 		fl6.flowi6_oif = np->ucast_oif;
5861da177e4SLinus Torvalds 
587b515430aSWillem de Bruijn 	ipcm6_init_sk(&ipc6, np);
5880da7536fSWillem de Bruijn 	ipc6.sockc.mark = mark;
58938b7097bSHannes Frederic Sowa 	fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
59038b7097bSHannes Frederic Sowa 
5914c9483b2SDavid S. Miller 	dst = icmpv6_route_lookup(net, skb, sk, &fl6);
592b42835dbSDavid S. Miller 	if (IS_ERR(dst))
5931da177e4SLinus Torvalds 		goto out;
5948de3351eSYOSHIFUJI Hideaki 
59526879da5SWei Wang 	ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
5961da177e4SLinus Torvalds 
5971da177e4SLinus Torvalds 	msg.skb = skb;
598bbe735e4SArnaldo Carvalho de Melo 	msg.offset = skb_network_offset(skb);
599763ecff1SYasuyuki Kozakai 	msg.type = type;
6001da177e4SLinus Torvalds 
6011da177e4SLinus Torvalds 	len = skb->len - msg.offset;
6021da177e4SLinus Torvalds 	len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr));
6031da177e4SLinus Torvalds 	if (len < 0) {
6044b3418fbSBjørn Mork 		net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n",
6054b3418fbSBjørn Mork 				    &hdr->saddr, &hdr->daddr);
6061da177e4SLinus Torvalds 		goto out_dst_release;
6071da177e4SLinus Torvalds 	}
6081da177e4SLinus Torvalds 
609cfdf7647SEric Dumazet 	rcu_read_lock();
610cfdf7647SEric Dumazet 	idev = __in6_dev_get(skb->dev);
6111da177e4SLinus Torvalds 
6124e64b1edSJoe Perches 	if (ip6_append_data(sk, icmpv6_getfrag, &msg,
6131da177e4SLinus Torvalds 			    len + sizeof(struct icmp6hdr),
61426879da5SWei Wang 			    sizeof(struct icmp6hdr),
61526879da5SWei Wang 			    &ipc6, &fl6, (struct rt6_info *)dst,
6165fdaa88dSWillem de Bruijn 			    MSG_DONTWAIT)) {
61743a43b60SHannes Frederic Sowa 		ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS);
6181da177e4SLinus Torvalds 		ip6_flush_pending_frames(sk);
619cfdf7647SEric Dumazet 	} else {
6204e64b1edSJoe Perches 		icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr,
621cfdf7647SEric Dumazet 					   len + sizeof(struct icmp6hdr));
6221da177e4SLinus Torvalds 	}
623cfdf7647SEric Dumazet 	rcu_read_unlock();
6241da177e4SLinus Torvalds out_dst_release:
6251da177e4SLinus Torvalds 	dst_release(dst);
6261da177e4SLinus Torvalds out:
627405666dbSDenis V. Lunev 	icmpv6_xmit_unlock(sk);
6287ba91ecbSJesper Dangaard Brouer out_bh_enable:
6297ba91ecbSJesper Dangaard Brouer 	local_bh_enable();
6301da177e4SLinus Torvalds }
631cc7a21b6SEric Dumazet EXPORT_SYMBOL(icmp6_send);
6325f5624cfSPravin B Shelar 
6331ad6d548SMenglong Dong /* Slightly more convenient version of icmp6_send with drop reasons.
6345f5624cfSPravin B Shelar  */
6351ad6d548SMenglong Dong void icmpv6_param_prob_reason(struct sk_buff *skb, u8 code, int pos,
6361ad6d548SMenglong Dong 			      enum skb_drop_reason reason)
6375f5624cfSPravin B Shelar {
638ee576c47SJason A. Donenfeld 	icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL, IP6CB(skb));
6391ad6d548SMenglong Dong 	kfree_skb_reason(skb, reason);
6405f5624cfSPravin B Shelar }
6417159039aSYOSHIFUJI Hideaki 
6425fbba8acSEric Dumazet /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH
6435fbba8acSEric Dumazet  * if sufficient data bytes are available
6445fbba8acSEric Dumazet  * @nhs is the size of the tunnel header(s) :
6455fbba8acSEric Dumazet  *  Either an IPv4 header for SIT encap
6465fbba8acSEric Dumazet  *         an IPv4 header + GRE header for GRE encap
6475fbba8acSEric Dumazet  */
64820e1954fSEric Dumazet int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type,
64920e1954fSEric Dumazet 			       unsigned int data_len)
6505fbba8acSEric Dumazet {
6512d7a3b27SEric Dumazet 	struct in6_addr temp_saddr;
6525fbba8acSEric Dumazet 	struct rt6_info *rt;
6535fbba8acSEric Dumazet 	struct sk_buff *skb2;
65420e1954fSEric Dumazet 	u32 info = 0;
6555fbba8acSEric Dumazet 
6565fbba8acSEric Dumazet 	if (!pskb_may_pull(skb, nhs + sizeof(struct ipv6hdr) + 8))
6575fbba8acSEric Dumazet 		return 1;
6585fbba8acSEric Dumazet 
65920e1954fSEric Dumazet 	/* RFC 4884 (partial) support for ICMP extensions */
66020e1954fSEric Dumazet 	if (data_len < 128 || (data_len & 7) || skb->len < data_len)
66120e1954fSEric Dumazet 		data_len = 0;
66220e1954fSEric Dumazet 
66320e1954fSEric Dumazet 	skb2 = data_len ? skb_copy(skb, GFP_ATOMIC) : skb_clone(skb, GFP_ATOMIC);
6645fbba8acSEric Dumazet 
6655fbba8acSEric Dumazet 	if (!skb2)
6665fbba8acSEric Dumazet 		return 1;
6675fbba8acSEric Dumazet 
6685fbba8acSEric Dumazet 	skb_dst_drop(skb2);
6695fbba8acSEric Dumazet 	skb_pull(skb2, nhs);
6705fbba8acSEric Dumazet 	skb_reset_network_header(skb2);
6715fbba8acSEric Dumazet 
672b75cc8f9SDavid Ahern 	rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0,
673b75cc8f9SDavid Ahern 			skb, 0);
6745fbba8acSEric Dumazet 
6755fbba8acSEric Dumazet 	if (rt && rt->dst.dev)
6765fbba8acSEric Dumazet 		skb2->dev = rt->dst.dev;
6775fbba8acSEric Dumazet 
6782d7a3b27SEric Dumazet 	ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr);
67920e1954fSEric Dumazet 
68020e1954fSEric Dumazet 	if (data_len) {
68120e1954fSEric Dumazet 		/* RFC 4884 (partial) support :
68220e1954fSEric Dumazet 		 * insert 0 padding at the end, before the extensions
68320e1954fSEric Dumazet 		 */
68420e1954fSEric Dumazet 		__skb_push(skb2, nhs);
68520e1954fSEric Dumazet 		skb_reset_network_header(skb2);
68620e1954fSEric Dumazet 		memmove(skb2->data, skb2->data + nhs, data_len - nhs);
68720e1954fSEric Dumazet 		memset(skb2->data + data_len - nhs, 0, nhs);
68820e1954fSEric Dumazet 		/* RFC 4884 4.5 : Length is measured in 64-bit words,
68920e1954fSEric Dumazet 		 * and stored in reserved[0]
69020e1954fSEric Dumazet 		 */
69120e1954fSEric Dumazet 		info = (data_len/8) << 24;
69220e1954fSEric Dumazet 	}
6932d7a3b27SEric Dumazet 	if (type == ICMP_TIME_EXCEEDED)
6942d7a3b27SEric Dumazet 		icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT,
695ee576c47SJason A. Donenfeld 			   info, &temp_saddr, IP6CB(skb2));
6962d7a3b27SEric Dumazet 	else
6972d7a3b27SEric Dumazet 		icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH,
698ee576c47SJason A. Donenfeld 			   info, &temp_saddr, IP6CB(skb2));
6995fbba8acSEric Dumazet 	if (rt)
7005fbba8acSEric Dumazet 		ip6_rt_put(rt);
7015fbba8acSEric Dumazet 
7025fbba8acSEric Dumazet 	kfree_skb(skb2);
7035fbba8acSEric Dumazet 
7045fbba8acSEric Dumazet 	return 0;
7055fbba8acSEric Dumazet }
7065fbba8acSEric Dumazet EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach);
7075fbba8acSEric Dumazet 
7081da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb)
7091da177e4SLinus Torvalds {
710c346dca1SYOSHIFUJI Hideaki 	struct net *net = dev_net(skb->dev);
71184427d53SYOSHIFUJI Hideaki 	struct sock *sk;
7121da177e4SLinus Torvalds 	struct inet6_dev *idev;
71384427d53SYOSHIFUJI Hideaki 	struct ipv6_pinfo *np;
714b71d1d42SEric Dumazet 	const struct in6_addr *saddr = NULL;
715cc70ab26SArnaldo Carvalho de Melo 	struct icmp6hdr *icmph = icmp6_hdr(skb);
7161da177e4SLinus Torvalds 	struct icmp6hdr tmp_hdr;
7174c9483b2SDavid S. Miller 	struct flowi6 fl6;
7181da177e4SLinus Torvalds 	struct icmpv6_msg msg;
7191da177e4SLinus Torvalds 	struct dst_entry *dst;
72026879da5SWei Wang 	struct ipcm6_cookie ipc6;
721e110861fSLorenzo Colitti 	u32 mark = IP6_REPLY_MARK(net, skb->mark);
7220b03a5caSStephen Suryaputra 	bool acast;
7231fd07f33SAndreas Roeseler 	u8 type;
7241da177e4SLinus Torvalds 
72503f1ecccSStephen Suryaputra 	if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) &&
72603f1ecccSStephen Suryaputra 	    net->ipv6.sysctl.icmpv6_echo_ignore_multicast)
72703f1ecccSStephen Suryaputra 		return;
72803f1ecccSStephen Suryaputra 
7290660e03fSArnaldo Carvalho de Melo 	saddr = &ipv6_hdr(skb)->daddr;
7301da177e4SLinus Torvalds 
7310b03a5caSStephen Suryaputra 	acast = ipv6_anycast_destination(skb_dst(skb), saddr);
7320b03a5caSStephen Suryaputra 	if (acast && net->ipv6.sysctl.icmpv6_echo_ignore_anycast)
7330b03a5caSStephen Suryaputra 		return;
7340b03a5caSStephen Suryaputra 
735509aba3bSFX Le Bail 	if (!ipv6_unicast_destination(skb) &&
7360b03a5caSStephen Suryaputra 	    !(net->ipv6.sysctl.anycast_src_echo_reply && acast))
7371da177e4SLinus Torvalds 		saddr = NULL;
7381da177e4SLinus Torvalds 
7391fd07f33SAndreas Roeseler 	if (icmph->icmp6_type == ICMPV6_EXT_ECHO_REQUEST)
7401fd07f33SAndreas Roeseler 		type = ICMPV6_EXT_ECHO_REPLY;
7411fd07f33SAndreas Roeseler 	else
7421fd07f33SAndreas Roeseler 		type = ICMPV6_ECHO_REPLY;
7431fd07f33SAndreas Roeseler 
7441da177e4SLinus Torvalds 	memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr));
7451fd07f33SAndreas Roeseler 	tmp_hdr.icmp6_type = type;
7461da177e4SLinus Torvalds 
7474c9483b2SDavid S. Miller 	memset(&fl6, 0, sizeof(fl6));
748a346abe0SEric Dumazet 	if (net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES)
749a346abe0SEric Dumazet 		fl6.flowlabel = ip6_flowlabel(ipv6_hdr(skb));
750a346abe0SEric Dumazet 
7514c9483b2SDavid S. Miller 	fl6.flowi6_proto = IPPROTO_ICMPV6;
7524e3fd7a0SAlexey Dobriyan 	fl6.daddr = ipv6_hdr(skb)->saddr;
7531da177e4SLinus Torvalds 	if (saddr)
7544e3fd7a0SAlexey Dobriyan 		fl6.saddr = *saddr;
7551b70d792SDavid Ahern 	fl6.flowi6_oif = icmp6_iif(skb);
7561fd07f33SAndreas Roeseler 	fl6.fl6_icmp_type = type;
757e110861fSLorenzo Colitti 	fl6.flowi6_mark = mark;
758e2d118a1SLorenzo Colitti 	fl6.flowi6_uid = sock_net_uid(net, NULL);
7593df98d79SPaul Moore 	security_skb_classify_flow(skb, flowi6_to_flowi_common(&fl6));
7601da177e4SLinus Torvalds 
7617ba91ecbSJesper Dangaard Brouer 	local_bh_disable();
762fdc0bde9SDenis V. Lunev 	sk = icmpv6_xmit_lock(net);
76363159f29SIan Morris 	if (!sk)
7647ba91ecbSJesper Dangaard Brouer 		goto out_bh_enable;
765fdc0bde9SDenis V. Lunev 	np = inet6_sk(sk);
766405666dbSDenis V. Lunev 
7674c9483b2SDavid S. Miller 	if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
7684c9483b2SDavid S. Miller 		fl6.flowi6_oif = np->mcast_oif;
769c4062dfcSErich E. Hoover 	else if (!fl6.flowi6_oif)
770c4062dfcSErich E. Hoover 		fl6.flowi6_oif = np->ucast_oif;
7711da177e4SLinus Torvalds 
7724e64b1edSJoe Perches 	if (ip6_dst_lookup(net, sk, &dst, &fl6))
7731da177e4SLinus Torvalds 		goto out;
7744c9483b2SDavid S. Miller 	dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0);
775452edd59SDavid S. Miller 	if (IS_ERR(dst))
776e104411bSPatrick McHardy 		goto out;
7771da177e4SLinus Torvalds 
7780bc19985SStephen Suryaputra 	/* Check the ratelimit */
7790bc19985SStephen Suryaputra 	if ((!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, ICMPV6_ECHO_REPLY)) ||
7800bc19985SStephen Suryaputra 	    !icmpv6_xrlim_allow(sk, ICMPV6_ECHO_REPLY, &fl6))
7810bc19985SStephen Suryaputra 		goto out_dst_release;
7820bc19985SStephen Suryaputra 
783cfdf7647SEric Dumazet 	idev = __in6_dev_get(skb->dev);
7841da177e4SLinus Torvalds 
7851da177e4SLinus Torvalds 	msg.skb = skb;
7861da177e4SLinus Torvalds 	msg.offset = 0;
7871fd07f33SAndreas Roeseler 	msg.type = type;
7881da177e4SLinus Torvalds 
789b515430aSWillem de Bruijn 	ipcm6_init_sk(&ipc6, np);
79026879da5SWei Wang 	ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
79126879da5SWei Wang 	ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb));
7920da7536fSWillem de Bruijn 	ipc6.sockc.mark = mark;
79326879da5SWei Wang 
7941fd07f33SAndreas Roeseler 	if (icmph->icmp6_type == ICMPV6_EXT_ECHO_REQUEST)
7951fd07f33SAndreas Roeseler 		if (!icmp_build_probe(skb, (struct icmphdr *)&tmp_hdr))
7961fd07f33SAndreas Roeseler 			goto out_dst_release;
7971fd07f33SAndreas Roeseler 
7984e64b1edSJoe Perches 	if (ip6_append_data(sk, icmpv6_getfrag, &msg,
7994e64b1edSJoe Perches 			    skb->len + sizeof(struct icmp6hdr),
80026879da5SWei Wang 			    sizeof(struct icmp6hdr), &ipc6, &fl6,
8015fdaa88dSWillem de Bruijn 			    (struct rt6_info *)dst, MSG_DONTWAIT)) {
802a16292a0SEric Dumazet 		__ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS);
8031da177e4SLinus Torvalds 		ip6_flush_pending_frames(sk);
804cfdf7647SEric Dumazet 	} else {
8054e64b1edSJoe Perches 		icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr,
806cfdf7647SEric Dumazet 					   skb->len + sizeof(struct icmp6hdr));
8071da177e4SLinus Torvalds 	}
8080bc19985SStephen Suryaputra out_dst_release:
8091da177e4SLinus Torvalds 	dst_release(dst);
8101da177e4SLinus Torvalds out:
811405666dbSDenis V. Lunev 	icmpv6_xmit_unlock(sk);
8127ba91ecbSJesper Dangaard Brouer out_bh_enable:
8137ba91ecbSJesper Dangaard Brouer 	local_bh_enable();
8141da177e4SLinus Torvalds }
8151da177e4SLinus Torvalds 
816*30c89badSEric Dumazet enum skb_drop_reason icmpv6_notify(struct sk_buff *skb, u8 type,
817*30c89badSEric Dumazet 				   u8 code, __be32 info)
8181da177e4SLinus Torvalds {
819e4129440SAndrew Lunn 	struct inet6_skb_parm *opt = IP6CB(skb);
820*30c89badSEric Dumazet 	struct net *net = dev_net(skb->dev);
82141135cc8SAlexey Dobriyan 	const struct inet6_protocol *ipprot;
822*30c89badSEric Dumazet 	enum skb_drop_reason reason;
8231da177e4SLinus Torvalds 	int inner_offset;
82475f2811cSJesse Gross 	__be16 frag_off;
825f9242b6bSDavid S. Miller 	u8 nexthdr;
8261da177e4SLinus Torvalds 
827*30c89badSEric Dumazet 	reason = pskb_may_pull_reason(skb, sizeof(struct ipv6hdr));
828*30c89badSEric Dumazet 	if (reason != SKB_NOT_DROPPED_YET)
8297304fe46SDuan Jiong 		goto out;
8301da177e4SLinus Torvalds 
831e4129440SAndrew Lunn 	seg6_icmp_srh(skb, opt);
832e4129440SAndrew Lunn 
8331da177e4SLinus Torvalds 	nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr;
8341da177e4SLinus Torvalds 	if (ipv6_ext_hdr(nexthdr)) {
8351da177e4SLinus Torvalds 		/* now skip over extension headers */
83675f2811cSJesse Gross 		inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr),
83775f2811cSJesse Gross 						&nexthdr, &frag_off);
838*30c89badSEric Dumazet 		if (inner_offset < 0) {
839*30c89badSEric Dumazet 			SKB_DR_SET(reason, IPV6_BAD_EXTHDR);
8407304fe46SDuan Jiong 			goto out;
841*30c89badSEric Dumazet 		}
8421da177e4SLinus Torvalds 	} else {
8431da177e4SLinus Torvalds 		inner_offset = sizeof(struct ipv6hdr);
8441da177e4SLinus Torvalds 	}
8451da177e4SLinus Torvalds 
8461da177e4SLinus Torvalds 	/* Checkin header including 8 bytes of inner protocol header. */
847*30c89badSEric Dumazet 	reason = pskb_may_pull_reason(skb, inner_offset + 8);
848*30c89badSEric Dumazet 	if (reason != SKB_NOT_DROPPED_YET)
8497304fe46SDuan Jiong 		goto out;
8501da177e4SLinus Torvalds 
8511da177e4SLinus Torvalds 	/* BUGGG_FUTURE: we should try to parse exthdrs in this packet.
8521da177e4SLinus Torvalds 	   Without this we will not able f.e. to make source routed
8531da177e4SLinus Torvalds 	   pmtu discovery.
8541da177e4SLinus Torvalds 	   Corresponding argument (opt) to notifiers is already added.
8551da177e4SLinus Torvalds 	   --ANK (980726)
8561da177e4SLinus Torvalds 	 */
8571da177e4SLinus Torvalds 
858f9242b6bSDavid S. Miller 	ipprot = rcu_dereference(inet6_protos[nexthdr]);
8591da177e4SLinus Torvalds 	if (ipprot && ipprot->err_handler)
860e4129440SAndrew Lunn 		ipprot->err_handler(skb, opt, type, code, inner_offset, info);
8611da177e4SLinus Torvalds 
86269d6da0bSPavel Emelyanov 	raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info);
863*30c89badSEric Dumazet 	return SKB_CONSUMED;
8647304fe46SDuan Jiong 
8657304fe46SDuan Jiong out:
866a16292a0SEric Dumazet 	__ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
867*30c89badSEric Dumazet 	return reason;
8681da177e4SLinus Torvalds }
8691da177e4SLinus Torvalds 
8701da177e4SLinus Torvalds /*
8711da177e4SLinus Torvalds  *	Handle icmp messages
8721da177e4SLinus Torvalds  */
8731da177e4SLinus Torvalds 
874e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb)
8751da177e4SLinus Torvalds {
876b384c95aSMenglong Dong 	enum skb_drop_reason reason = SKB_DROP_REASON_NOT_SPECIFIED;
877e6f86b0fSVirgile Jarry 	struct net *net = dev_net(skb->dev);
878e1ae5c2eSStephen Suryaputra 	struct net_device *dev = icmp6_dev(skb);
8791da177e4SLinus Torvalds 	struct inet6_dev *idev = __in6_dev_get(dev);
880b71d1d42SEric Dumazet 	const struct in6_addr *saddr, *daddr;
8811da177e4SLinus Torvalds 	struct icmp6hdr *hdr;
882d5fdd6baSBrian Haley 	u8 type;
8831da177e4SLinus Torvalds 
884aebcf82cSHerbert Xu 	if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
885def8b4faSAlexey Dobriyan 		struct sec_path *sp = skb_sec_path(skb);
8868b7817f3SHerbert Xu 		int nh;
8878b7817f3SHerbert Xu 
888def8b4faSAlexey Dobriyan 		if (!(sp && sp->xvec[sp->len - 1]->props.flags &
889b384c95aSMenglong Dong 				 XFRM_STATE_ICMP)) {
890b384c95aSMenglong Dong 			reason = SKB_DROP_REASON_XFRM_POLICY;
891aebcf82cSHerbert Xu 			goto drop_no_count;
892b384c95aSMenglong Dong 		}
893aebcf82cSHerbert Xu 
89481aded24SDavid S. Miller 		if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr)))
8958b7817f3SHerbert Xu 			goto drop_no_count;
8968b7817f3SHerbert Xu 
8978b7817f3SHerbert Xu 		nh = skb_network_offset(skb);
8988b7817f3SHerbert Xu 		skb_set_network_header(skb, sizeof(*hdr));
8998b7817f3SHerbert Xu 
900b384c95aSMenglong Dong 		if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN,
901b384c95aSMenglong Dong 						skb)) {
902b384c95aSMenglong Dong 			reason = SKB_DROP_REASON_XFRM_POLICY;
9038b7817f3SHerbert Xu 			goto drop_no_count;
904b384c95aSMenglong Dong 		}
9058b7817f3SHerbert Xu 
9068b7817f3SHerbert Xu 		skb_set_network_header(skb, nh);
9078b7817f3SHerbert Xu 	}
9088b7817f3SHerbert Xu 
909a16292a0SEric Dumazet 	__ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS);
9101da177e4SLinus Torvalds 
9110660e03fSArnaldo Carvalho de Melo 	saddr = &ipv6_hdr(skb)->saddr;
9120660e03fSArnaldo Carvalho de Melo 	daddr = &ipv6_hdr(skb)->daddr;
9131da177e4SLinus Torvalds 
91439471ac8STom Herbert 	if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) {
915ba7a46f1SJoe Perches 		net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n",
9160c6ce78aSHarvey Harrison 				    saddr, daddr);
9176a5dc9e5SEric Dumazet 		goto csum_error;
9181da177e4SLinus Torvalds 	}
9191da177e4SLinus Torvalds 
9208cf22943SHerbert Xu 	if (!pskb_pull(skb, sizeof(*hdr)))
9218cf22943SHerbert Xu 		goto discard_it;
9221da177e4SLinus Torvalds 
923cc70ab26SArnaldo Carvalho de Melo 	hdr = icmp6_hdr(skb);
9241da177e4SLinus Torvalds 
9251da177e4SLinus Torvalds 	type = hdr->icmp6_type;
9261da177e4SLinus Torvalds 
927f3832ed2SEric Dumazet 	ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type);
9281da177e4SLinus Torvalds 
9291da177e4SLinus Torvalds 	switch (type) {
9301da177e4SLinus Torvalds 	case ICMPV6_ECHO_REQUEST:
931e6f86b0fSVirgile Jarry 		if (!net->ipv6.sysctl.icmpv6_echo_ignore_all)
9321da177e4SLinus Torvalds 			icmpv6_echo_reply(skb);
9331da177e4SLinus Torvalds 		break;
9341fd07f33SAndreas Roeseler 	case ICMPV6_EXT_ECHO_REQUEST:
9351fd07f33SAndreas Roeseler 		if (!net->ipv6.sysctl.icmpv6_echo_ignore_all &&
9364a2f7083SKuniyuki Iwashima 		    READ_ONCE(net->ipv4.sysctl_icmp_echo_enable_probe))
9371fd07f33SAndreas Roeseler 			icmpv6_echo_reply(skb);
9381fd07f33SAndreas Roeseler 		break;
9391da177e4SLinus Torvalds 
9401da177e4SLinus Torvalds 	case ICMPV6_ECHO_REPLY:
941b384c95aSMenglong Dong 		reason = ping_rcv(skb);
9421da177e4SLinus Torvalds 		break;
9431da177e4SLinus Torvalds 
94431433202SAndreas Roeseler 	case ICMPV6_EXT_ECHO_REPLY:
945b384c95aSMenglong Dong 		reason = ping_rcv(skb);
94631433202SAndreas Roeseler 		break;
94731433202SAndreas Roeseler 
9481da177e4SLinus Torvalds 	case ICMPV6_PKT_TOOBIG:
9491da177e4SLinus Torvalds 		/* BUGGG_FUTURE: if packet contains rthdr, we cannot update
9501da177e4SLinus Torvalds 		   standard destination cache. Seems, only "advanced"
9511da177e4SLinus Torvalds 		   destination cache will allow to solve this problem
9521da177e4SLinus Torvalds 		   --ANK (980726)
9531da177e4SLinus Torvalds 		 */
9541da177e4SLinus Torvalds 		if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
9551da177e4SLinus Torvalds 			goto discard_it;
956cc70ab26SArnaldo Carvalho de Melo 		hdr = icmp6_hdr(skb);
9571da177e4SLinus Torvalds 
958275757e6SGustavo A. R. Silva 		/* to notify */
959a8eceea8SJoe Perches 		fallthrough;
9601da177e4SLinus Torvalds 	case ICMPV6_DEST_UNREACH:
9611da177e4SLinus Torvalds 	case ICMPV6_TIME_EXCEED:
9621da177e4SLinus Torvalds 	case ICMPV6_PARAMPROB:
963*30c89badSEric Dumazet 		reason = icmpv6_notify(skb, type, hdr->icmp6_code,
964*30c89badSEric Dumazet 				       hdr->icmp6_mtu);
9651da177e4SLinus Torvalds 		break;
9661da177e4SLinus Torvalds 
9671da177e4SLinus Torvalds 	case NDISC_ROUTER_SOLICITATION:
9681da177e4SLinus Torvalds 	case NDISC_ROUTER_ADVERTISEMENT:
9691da177e4SLinus Torvalds 	case NDISC_NEIGHBOUR_SOLICITATION:
9701da177e4SLinus Torvalds 	case NDISC_NEIGHBOUR_ADVERTISEMENT:
9711da177e4SLinus Torvalds 	case NDISC_REDIRECT:
9721da177e4SLinus Torvalds 		ndisc_rcv(skb);
9731da177e4SLinus Torvalds 		break;
9741da177e4SLinus Torvalds 
9751da177e4SLinus Torvalds 	case ICMPV6_MGM_QUERY:
9761da177e4SLinus Torvalds 		igmp6_event_query(skb);
977f185de28STaehee Yoo 		return 0;
9781da177e4SLinus Torvalds 
9791da177e4SLinus Torvalds 	case ICMPV6_MGM_REPORT:
9801da177e4SLinus Torvalds 		igmp6_event_report(skb);
981f185de28STaehee Yoo 		return 0;
9821da177e4SLinus Torvalds 
9831da177e4SLinus Torvalds 	case ICMPV6_MGM_REDUCTION:
9841da177e4SLinus Torvalds 	case ICMPV6_NI_QUERY:
9851da177e4SLinus Torvalds 	case ICMPV6_NI_REPLY:
9861da177e4SLinus Torvalds 	case ICMPV6_MLD2_REPORT:
9871da177e4SLinus Torvalds 	case ICMPV6_DHAAD_REQUEST:
9881da177e4SLinus Torvalds 	case ICMPV6_DHAAD_REPLY:
9891da177e4SLinus Torvalds 	case ICMPV6_MOBILE_PREFIX_SOL:
9901da177e4SLinus Torvalds 	case ICMPV6_MOBILE_PREFIX_ADV:
9911da177e4SLinus Torvalds 		break;
9921da177e4SLinus Torvalds 
9931da177e4SLinus Torvalds 	default:
9941da177e4SLinus Torvalds 		/* informational */
9951da177e4SLinus Torvalds 		if (type & ICMPV6_INFOMSG_MASK)
9961da177e4SLinus Torvalds 			break;
9971da177e4SLinus Torvalds 
9984b3418fbSBjørn Mork 		net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n",
9994b3418fbSBjørn Mork 				    saddr, daddr);
1000ea85a0a2SDavid S. Miller 
10011da177e4SLinus Torvalds 		/*
10021da177e4SLinus Torvalds 		 * error of unknown type.
10031da177e4SLinus Torvalds 		 * must pass to upper level
10041da177e4SLinus Torvalds 		 */
10051da177e4SLinus Torvalds 
1006*30c89badSEric Dumazet 		reason = icmpv6_notify(skb, type, hdr->icmp6_code,
1007*30c89badSEric Dumazet 				       hdr->icmp6_mtu);
10083ff50b79SStephen Hemminger 	}
10093ff50b79SStephen Hemminger 
1010e3e32170SRick Jones 	/* until the v6 path can be better sorted assume failure and
1011e3e32170SRick Jones 	 * preserve the status quo behaviour for the rest of the paths to here
1012e3e32170SRick Jones 	 */
1013b384c95aSMenglong Dong 	if (reason)
1014b384c95aSMenglong Dong 		kfree_skb_reason(skb, reason);
1015e3e32170SRick Jones 	else
1016b384c95aSMenglong Dong 		consume_skb(skb);
1017e3e32170SRick Jones 
10181da177e4SLinus Torvalds 	return 0;
10191da177e4SLinus Torvalds 
10206a5dc9e5SEric Dumazet csum_error:
1021b384c95aSMenglong Dong 	reason = SKB_DROP_REASON_ICMP_CSUM;
1022a16292a0SEric Dumazet 	__ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS);
10231da177e4SLinus Torvalds discard_it:
1024a16292a0SEric Dumazet 	__ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS);
10258b7817f3SHerbert Xu drop_no_count:
1026b384c95aSMenglong Dong 	kfree_skb_reason(skb, reason);
10271da177e4SLinus Torvalds 	return 0;
10281da177e4SLinus Torvalds }
10291da177e4SLinus Torvalds 
10304c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6,
103195e41e93SYOSHIFUJI Hideaki 		      u8 type,
103295e41e93SYOSHIFUJI Hideaki 		      const struct in6_addr *saddr,
103395e41e93SYOSHIFUJI Hideaki 		      const struct in6_addr *daddr,
103495e41e93SYOSHIFUJI Hideaki 		      int oif)
103595e41e93SYOSHIFUJI Hideaki {
10364c9483b2SDavid S. Miller 	memset(fl6, 0, sizeof(*fl6));
10374e3fd7a0SAlexey Dobriyan 	fl6->saddr = *saddr;
10384e3fd7a0SAlexey Dobriyan 	fl6->daddr = *daddr;
10394c9483b2SDavid S. Miller 	fl6->flowi6_proto	= IPPROTO_ICMPV6;
10401958b856SDavid S. Miller 	fl6->fl6_icmp_type	= type;
10411958b856SDavid S. Miller 	fl6->fl6_icmp_code	= 0;
10424c9483b2SDavid S. Miller 	fl6->flowi6_oif		= oif;
10433df98d79SPaul Moore 	security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6));
104495e41e93SYOSHIFUJI Hideaki }
104595e41e93SYOSHIFUJI Hideaki 
10466a17b961SEric Dumazet int __init icmpv6_init(void)
10471da177e4SLinus Torvalds {
10481da177e4SLinus Torvalds 	struct sock *sk;
10493232a1efSKefeng Wang 	int err, i;
10501da177e4SLinus Torvalds 
10516f912042SKAMEZAWA Hiroyuki 	for_each_possible_cpu(i) {
10521ed8516fSDenis V. Lunev 		err = inet_ctl_sock_create(&sk, PF_INET6,
10536a17b961SEric Dumazet 					   SOCK_RAW, IPPROTO_ICMPV6, &init_net);
10541da177e4SLinus Torvalds 		if (err < 0) {
1055f3213831SJoe Perches 			pr_err("Failed to initialize the ICMP6 control socket (err %d)\n",
10561da177e4SLinus Torvalds 			       err);
10576a17b961SEric Dumazet 			return err;
10581da177e4SLinus Torvalds 		}
10591da177e4SLinus Torvalds 
10606a17b961SEric Dumazet 		per_cpu(ipv6_icmp_sk, i) = sk;
10615c8cafd6SDenis V. Lunev 
10621da177e4SLinus Torvalds 		/* Enough space for 2 64K ICMP packets, including
10631da177e4SLinus Torvalds 		 * sk_buff struct overhead.
10641da177e4SLinus Torvalds 		 */
106587fb4b7bSEric Dumazet 		sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024);
10661da177e4SLinus Torvalds 	}
106798c6d1b2SDenis V. Lunev 
106898c6d1b2SDenis V. Lunev 	err = -EAGAIN;
106998c6d1b2SDenis V. Lunev 	if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0)
107098c6d1b2SDenis V. Lunev 		goto fail;
10715f5624cfSPravin B Shelar 
10725f5624cfSPravin B Shelar 	err = inet6_register_icmp_sender(icmp6_send);
10735f5624cfSPravin B Shelar 	if (err)
10745f5624cfSPravin B Shelar 		goto sender_reg_err;
107598c6d1b2SDenis V. Lunev 	return 0;
107698c6d1b2SDenis V. Lunev 
10775f5624cfSPravin B Shelar sender_reg_err:
10785f5624cfSPravin B Shelar 	inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6);
107998c6d1b2SDenis V. Lunev fail:
1080f3213831SJoe Perches 	pr_err("Failed to register ICMP6 protocol\n");
108198c6d1b2SDenis V. Lunev 	return err;
108298c6d1b2SDenis V. Lunev }
108398c6d1b2SDenis V. Lunev 
10848ed7edceSAlexey Dobriyan void icmpv6_cleanup(void)
108598c6d1b2SDenis V. Lunev {
10865f5624cfSPravin B Shelar 	inet6_unregister_icmp_sender(icmp6_send);
10871da177e4SLinus Torvalds 	inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6);
10881da177e4SLinus Torvalds }
10891da177e4SLinus Torvalds 
109098c6d1b2SDenis V. Lunev 
10919b5b5cffSArjan van de Ven static const struct icmp6_err {
10921da177e4SLinus Torvalds 	int err;
10931da177e4SLinus Torvalds 	int fatal;
10941da177e4SLinus Torvalds } tab_unreach[] = {
10951da177e4SLinus Torvalds 	{	/* NOROUTE */
10961da177e4SLinus Torvalds 		.err	= ENETUNREACH,
10971da177e4SLinus Torvalds 		.fatal	= 0,
10981da177e4SLinus Torvalds 	},
10991da177e4SLinus Torvalds 	{	/* ADM_PROHIBITED */
11001da177e4SLinus Torvalds 		.err	= EACCES,
11011da177e4SLinus Torvalds 		.fatal	= 1,
11021da177e4SLinus Torvalds 	},
11031da177e4SLinus Torvalds 	{	/* Was NOT_NEIGHBOUR, now reserved */
11041da177e4SLinus Torvalds 		.err	= EHOSTUNREACH,
11051da177e4SLinus Torvalds 		.fatal	= 0,
11061da177e4SLinus Torvalds 	},
11071da177e4SLinus Torvalds 	{	/* ADDR_UNREACH	*/
11081da177e4SLinus Torvalds 		.err	= EHOSTUNREACH,
11091da177e4SLinus Torvalds 		.fatal	= 0,
11101da177e4SLinus Torvalds 	},
11111da177e4SLinus Torvalds 	{	/* PORT_UNREACH	*/
11121da177e4SLinus Torvalds 		.err	= ECONNREFUSED,
11131da177e4SLinus Torvalds 		.fatal	= 1,
11141da177e4SLinus Torvalds 	},
111561e76b17SJiri Bohac 	{	/* POLICY_FAIL */
111661e76b17SJiri Bohac 		.err	= EACCES,
111761e76b17SJiri Bohac 		.fatal	= 1,
111861e76b17SJiri Bohac 	},
111961e76b17SJiri Bohac 	{	/* REJECT_ROUTE	*/
112061e76b17SJiri Bohac 		.err	= EACCES,
112161e76b17SJiri Bohac 		.fatal	= 1,
112261e76b17SJiri Bohac 	},
11231da177e4SLinus Torvalds };
11241da177e4SLinus Torvalds 
1125d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err)
11261da177e4SLinus Torvalds {
11271da177e4SLinus Torvalds 	int fatal = 0;
11281da177e4SLinus Torvalds 
11291da177e4SLinus Torvalds 	*err = EPROTO;
11301da177e4SLinus Torvalds 
11311da177e4SLinus Torvalds 	switch (type) {
11321da177e4SLinus Torvalds 	case ICMPV6_DEST_UNREACH:
11331da177e4SLinus Torvalds 		fatal = 1;
113461e76b17SJiri Bohac 		if (code < ARRAY_SIZE(tab_unreach)) {
11351da177e4SLinus Torvalds 			*err  = tab_unreach[code].err;
11361da177e4SLinus Torvalds 			fatal = tab_unreach[code].fatal;
11371da177e4SLinus Torvalds 		}
11381da177e4SLinus Torvalds 		break;
11391da177e4SLinus Torvalds 
11401da177e4SLinus Torvalds 	case ICMPV6_PKT_TOOBIG:
11411da177e4SLinus Torvalds 		*err = EMSGSIZE;
11421da177e4SLinus Torvalds 		break;
11431da177e4SLinus Torvalds 
11441da177e4SLinus Torvalds 	case ICMPV6_PARAMPROB:
11451da177e4SLinus Torvalds 		*err = EPROTO;
11461da177e4SLinus Torvalds 		fatal = 1;
11471da177e4SLinus Torvalds 		break;
11481da177e4SLinus Torvalds 
11491da177e4SLinus Torvalds 	case ICMPV6_TIME_EXCEED:
11501da177e4SLinus Torvalds 		*err = EHOSTUNREACH;
11511da177e4SLinus Torvalds 		break;
11523ff50b79SStephen Hemminger 	}
11531da177e4SLinus Torvalds 
11541da177e4SLinus Torvalds 	return fatal;
11551da177e4SLinus Torvalds }
11567159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert);
11577159039aSYOSHIFUJI Hideaki 
11581da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL
1159e8243534Sstephen hemminger static struct ctl_table ipv6_icmp_table_template[] = {
11601da177e4SLinus Torvalds 	{
11611da177e4SLinus Torvalds 		.procname	= "ratelimit",
116241a76906SDaniel Lezcano 		.data		= &init_net.ipv6.sysctl.icmpv6_time,
11631da177e4SLinus Torvalds 		.maxlen		= sizeof(int),
11641da177e4SLinus Torvalds 		.mode		= 0644,
11656d9f239aSAlexey Dobriyan 		.proc_handler	= proc_dointvec_ms_jiffies,
11661da177e4SLinus Torvalds 	},
1167e6f86b0fSVirgile Jarry 	{
1168e6f86b0fSVirgile Jarry 		.procname	= "echo_ignore_all",
1169e6f86b0fSVirgile Jarry 		.data		= &init_net.ipv6.sysctl.icmpv6_echo_ignore_all,
1170a6175633SEric Dumazet 		.maxlen		= sizeof(u8),
1171e6f86b0fSVirgile Jarry 		.mode		= 0644,
1172a6175633SEric Dumazet 		.proc_handler = proc_dou8vec_minmax,
1173e6f86b0fSVirgile Jarry 	},
117403f1ecccSStephen Suryaputra 	{
117503f1ecccSStephen Suryaputra 		.procname	= "echo_ignore_multicast",
117603f1ecccSStephen Suryaputra 		.data		= &init_net.ipv6.sysctl.icmpv6_echo_ignore_multicast,
1177a6175633SEric Dumazet 		.maxlen		= sizeof(u8),
117803f1ecccSStephen Suryaputra 		.mode		= 0644,
1179a6175633SEric Dumazet 		.proc_handler = proc_dou8vec_minmax,
118003f1ecccSStephen Suryaputra 	},
11810b03a5caSStephen Suryaputra 	{
11820b03a5caSStephen Suryaputra 		.procname	= "echo_ignore_anycast",
11830b03a5caSStephen Suryaputra 		.data		= &init_net.ipv6.sysctl.icmpv6_echo_ignore_anycast,
1184a6175633SEric Dumazet 		.maxlen		= sizeof(u8),
11850b03a5caSStephen Suryaputra 		.mode		= 0644,
1186a6175633SEric Dumazet 		.proc_handler = proc_dou8vec_minmax,
11870b03a5caSStephen Suryaputra 	},
11880bc19985SStephen Suryaputra 	{
11890bc19985SStephen Suryaputra 		.procname	= "ratemask",
11900bc19985SStephen Suryaputra 		.data		= &init_net.ipv6.sysctl.icmpv6_ratemask_ptr,
11910bc19985SStephen Suryaputra 		.maxlen		= ICMPV6_MSG_MAX + 1,
11920bc19985SStephen Suryaputra 		.mode		= 0644,
11930bc19985SStephen Suryaputra 		.proc_handler = proc_do_large_bitmap,
11940bc19985SStephen Suryaputra 	},
1195f8572d8fSEric W. Biederman 	{ },
11961da177e4SLinus Torvalds };
1197760f2d01SDaniel Lezcano 
11982c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net)
1199760f2d01SDaniel Lezcano {
1200760f2d01SDaniel Lezcano 	struct ctl_table *table;
1201760f2d01SDaniel Lezcano 
1202760f2d01SDaniel Lezcano 	table = kmemdup(ipv6_icmp_table_template,
1203760f2d01SDaniel Lezcano 			sizeof(ipv6_icmp_table_template),
1204760f2d01SDaniel Lezcano 			GFP_KERNEL);
12055ee09105SYOSHIFUJI Hideaki 
1206e6f86b0fSVirgile Jarry 	if (table) {
12075ee09105SYOSHIFUJI Hideaki 		table[0].data = &net->ipv6.sysctl.icmpv6_time;
1208e6f86b0fSVirgile Jarry 		table[1].data = &net->ipv6.sysctl.icmpv6_echo_ignore_all;
120903f1ecccSStephen Suryaputra 		table[2].data = &net->ipv6.sysctl.icmpv6_echo_ignore_multicast;
12100b03a5caSStephen Suryaputra 		table[3].data = &net->ipv6.sysctl.icmpv6_echo_ignore_anycast;
12110bc19985SStephen Suryaputra 		table[4].data = &net->ipv6.sysctl.icmpv6_ratemask_ptr;
1212e6f86b0fSVirgile Jarry 	}
1213760f2d01SDaniel Lezcano 	return table;
1214760f2d01SDaniel Lezcano }
12151da177e4SLinus Torvalds #endif
1216