xref: /openbmc/linux/net/ipv6/icmp.c (revision 2874c5fd)
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>
601da177e4SLinus Torvalds #include <net/transp_v6.h>
611da177e4SLinus Torvalds #include <net/ip6_route.h>
621da177e4SLinus Torvalds #include <net/addrconf.h>
631da177e4SLinus Torvalds #include <net/icmp.h>
648b7817f3SHerbert Xu #include <net/xfrm.h>
651ed8516fSDenis V. Lunev #include <net/inet_common.h>
66825edac4SHannes Frederic Sowa #include <net/dsfield.h>
67ca254490SDavid Ahern #include <net/l3mdev.h>
681da177e4SLinus Torvalds 
697c0f6ba6SLinus Torvalds #include <linux/uaccess.h>
701da177e4SLinus Torvalds 
711da177e4SLinus Torvalds /*
721da177e4SLinus Torvalds  *	The ICMP socket(s). This is the most convenient way to flow control
731da177e4SLinus Torvalds  *	our ICMP output as well as maintain a clean interface throughout
741da177e4SLinus Torvalds  *	all layers. All Socketless IP sends will soon be gone.
751da177e4SLinus Torvalds  *
761da177e4SLinus Torvalds  *	On SMP we have one ICMP socket per-cpu.
771da177e4SLinus Torvalds  */
7898c6d1b2SDenis V. Lunev static inline struct sock *icmpv6_sk(struct net *net)
7998c6d1b2SDenis V. Lunev {
8075efc250SKefeng Wang 	return *this_cpu_ptr(net->ipv6.icmp_sk);
8198c6d1b2SDenis V. Lunev }
821da177e4SLinus Torvalds 
8332bbd879SStefano Brivio static int icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
846f809da2SSteffen Klassert 		       u8 type, u8 code, int offset, __be32 info)
856f809da2SSteffen Klassert {
866d0bfe22SLorenzo Colitti 	/* icmpv6_notify checks 8 bytes can be pulled, icmp6hdr is 8 bytes */
876d0bfe22SLorenzo Colitti 	struct icmp6hdr *icmp6 = (struct icmp6hdr *) (skb->data + offset);
886f809da2SSteffen Klassert 	struct net *net = dev_net(skb->dev);
896f809da2SSteffen Klassert 
906f809da2SSteffen Klassert 	if (type == ICMPV6_PKT_TOOBIG)
915f379ef5SGeorg Kohmann 		ip6_update_pmtu(skb, net, info, skb->dev->ifindex, 0, sock_net_uid(net, NULL));
926f809da2SSteffen Klassert 	else if (type == NDISC_REDIRECT)
93e2d118a1SLorenzo Colitti 		ip6_redirect(skb, net, skb->dev->ifindex, 0,
94e2d118a1SLorenzo Colitti 			     sock_net_uid(net, NULL));
956d0bfe22SLorenzo Colitti 
966d0bfe22SLorenzo Colitti 	if (!(type & ICMPV6_INFOMSG_MASK))
976d0bfe22SLorenzo Colitti 		if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST)
98dcb94b88SHannes Frederic Sowa 			ping_err(skb, offset, ntohl(info));
9932bbd879SStefano Brivio 
10032bbd879SStefano Brivio 	return 0;
1016f809da2SSteffen Klassert }
1026f809da2SSteffen Klassert 
103e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb);
1041da177e4SLinus Torvalds 
10541135cc8SAlexey Dobriyan static const struct inet6_protocol icmpv6_protocol = {
1061da177e4SLinus Torvalds 	.handler	=	icmpv6_rcv,
1076f809da2SSteffen Klassert 	.err_handler	=	icmpv6_err,
1088b7817f3SHerbert Xu 	.flags		=	INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1091da177e4SLinus Torvalds };
1101da177e4SLinus Torvalds 
1117ba91ecbSJesper Dangaard Brouer /* Called with BH disabled */
112fdc0bde9SDenis V. Lunev static __inline__ struct sock *icmpv6_xmit_lock(struct net *net)
1131da177e4SLinus Torvalds {
114fdc0bde9SDenis V. Lunev 	struct sock *sk;
115fdc0bde9SDenis V. Lunev 
116fdc0bde9SDenis V. Lunev 	sk = icmpv6_sk(net);
117405666dbSDenis V. Lunev 	if (unlikely(!spin_trylock(&sk->sk_lock.slock))) {
1181da177e4SLinus Torvalds 		/* This can happen if the output path (f.e. SIT or
1191da177e4SLinus Torvalds 		 * ip6ip6 tunnel) signals dst_link_failure() for an
1201da177e4SLinus Torvalds 		 * outgoing ICMP6 packet.
1211da177e4SLinus Torvalds 		 */
122fdc0bde9SDenis V. Lunev 		return NULL;
1231da177e4SLinus Torvalds 	}
124fdc0bde9SDenis V. Lunev 	return sk;
1251da177e4SLinus Torvalds }
1261da177e4SLinus Torvalds 
127405666dbSDenis V. Lunev static __inline__ void icmpv6_xmit_unlock(struct sock *sk)
1281da177e4SLinus Torvalds {
1297ba91ecbSJesper Dangaard Brouer 	spin_unlock(&sk->sk_lock.slock);
1301da177e4SLinus Torvalds }
1311da177e4SLinus Torvalds 
1321da177e4SLinus Torvalds /*
1331da177e4SLinus Torvalds  * Figure out, may we reply to this packet with icmp error.
1341da177e4SLinus Torvalds  *
1351da177e4SLinus Torvalds  * We do not reply, if:
1361da177e4SLinus Torvalds  *	- it was icmp error message.
1371da177e4SLinus Torvalds  *	- it is truncated, so that it is known, that protocol is ICMPV6
1381da177e4SLinus Torvalds  *	  (i.e. in the middle of some exthdr)
1391da177e4SLinus Torvalds  *
1401da177e4SLinus Torvalds  *	--ANK (980726)
1411da177e4SLinus Torvalds  */
1421da177e4SLinus Torvalds 
143a50feda5SEric Dumazet static bool is_ineligible(const struct sk_buff *skb)
1441da177e4SLinus Torvalds {
1450660e03fSArnaldo Carvalho de Melo 	int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data;
1461da177e4SLinus Torvalds 	int len = skb->len - ptr;
1470660e03fSArnaldo Carvalho de Melo 	__u8 nexthdr = ipv6_hdr(skb)->nexthdr;
14875f2811cSJesse Gross 	__be16 frag_off;
1491da177e4SLinus Torvalds 
1501da177e4SLinus Torvalds 	if (len < 0)
151a50feda5SEric Dumazet 		return true;
1521da177e4SLinus Torvalds 
15375f2811cSJesse Gross 	ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off);
1541da177e4SLinus Torvalds 	if (ptr < 0)
155a50feda5SEric Dumazet 		return false;
1561da177e4SLinus Torvalds 	if (nexthdr == IPPROTO_ICMPV6) {
1571da177e4SLinus Torvalds 		u8 _type, *tp;
1581da177e4SLinus Torvalds 		tp = skb_header_pointer(skb,
1591da177e4SLinus Torvalds 			ptr+offsetof(struct icmp6hdr, icmp6_type),
1601da177e4SLinus Torvalds 			sizeof(_type), &_type);
16163159f29SIan Morris 		if (!tp || !(*tp & ICMPV6_INFOMSG_MASK))
162a50feda5SEric Dumazet 			return true;
1631da177e4SLinus Torvalds 	}
164a50feda5SEric Dumazet 	return false;
1651da177e4SLinus Torvalds }
1661da177e4SLinus Torvalds 
1670bc19985SStephen Suryaputra static bool icmpv6_mask_allow(struct net *net, int type)
168c0303efeSJesper Dangaard Brouer {
1690bc19985SStephen Suryaputra 	if (type > ICMPV6_MSG_MAX)
170c0303efeSJesper Dangaard Brouer 		return true;
171c0303efeSJesper Dangaard Brouer 
1720bc19985SStephen Suryaputra 	/* Limit if icmp type is set in ratemask. */
1730bc19985SStephen Suryaputra 	if (!test_bit(type, net->ipv6.sysctl.icmpv6_ratemask))
174c0303efeSJesper Dangaard Brouer 		return true;
175c0303efeSJesper Dangaard Brouer 
176c0303efeSJesper Dangaard Brouer 	return false;
177c0303efeSJesper Dangaard Brouer }
178c0303efeSJesper Dangaard Brouer 
1790bc19985SStephen Suryaputra static bool icmpv6_global_allow(struct net *net, int type)
180c0303efeSJesper Dangaard Brouer {
1810bc19985SStephen Suryaputra 	if (icmpv6_mask_allow(net, type))
182c0303efeSJesper Dangaard Brouer 		return true;
183c0303efeSJesper Dangaard Brouer 
184c0303efeSJesper Dangaard Brouer 	if (icmp_global_allow())
185c0303efeSJesper Dangaard Brouer 		return true;
186c0303efeSJesper Dangaard Brouer 
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 	}
2281da177e4SLinus Torvalds 	dst_release(dst);
2291da177e4SLinus Torvalds 	return res;
2301da177e4SLinus Torvalds }
2311da177e4SLinus Torvalds 
2321da177e4SLinus Torvalds /*
2331da177e4SLinus Torvalds  *	an inline helper for the "simple" if statement below
2341da177e4SLinus Torvalds  *	checks if parameter problem report is caused by an
2351da177e4SLinus Torvalds  *	unrecognized IPv6 option that has the Option Type
2361da177e4SLinus Torvalds  *	highest-order two bits set to 10
2371da177e4SLinus Torvalds  */
2381da177e4SLinus Torvalds 
239a50feda5SEric Dumazet static bool opt_unrec(struct sk_buff *skb, __u32 offset)
2401da177e4SLinus Torvalds {
2411da177e4SLinus Torvalds 	u8 _optval, *op;
2421da177e4SLinus Torvalds 
243bbe735e4SArnaldo Carvalho de Melo 	offset += skb_network_offset(skb);
2441da177e4SLinus Torvalds 	op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval);
24563159f29SIan Morris 	if (!op)
246a50feda5SEric Dumazet 		return true;
2471da177e4SLinus Torvalds 	return (*op & 0xC0) == 0x80;
2481da177e4SLinus Torvalds }
2491da177e4SLinus Torvalds 
2504e64b1edSJoe Perches void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
2516d0bfe22SLorenzo Colitti 				struct icmp6hdr *thdr, int len)
2521da177e4SLinus Torvalds {
2531da177e4SLinus Torvalds 	struct sk_buff *skb;
2541da177e4SLinus Torvalds 	struct icmp6hdr *icmp6h;
2551da177e4SLinus Torvalds 
256e5d08d71SIan Morris 	skb = skb_peek(&sk->sk_write_queue);
25763159f29SIan Morris 	if (!skb)
2584e64b1edSJoe Perches 		return;
2591da177e4SLinus Torvalds 
260cc70ab26SArnaldo Carvalho de Melo 	icmp6h = icmp6_hdr(skb);
2611da177e4SLinus Torvalds 	memcpy(icmp6h, thdr, sizeof(struct icmp6hdr));
2621da177e4SLinus Torvalds 	icmp6h->icmp6_cksum = 0;
2631da177e4SLinus Torvalds 
2641da177e4SLinus Torvalds 	if (skb_queue_len(&sk->sk_write_queue) == 1) {
26507f0757aSJoe Perches 		skb->csum = csum_partial(icmp6h,
2661da177e4SLinus Torvalds 					sizeof(struct icmp6hdr), skb->csum);
2674c9483b2SDavid S. Miller 		icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr,
2684c9483b2SDavid S. Miller 						      &fl6->daddr,
2694c9483b2SDavid S. Miller 						      len, fl6->flowi6_proto,
2701da177e4SLinus Torvalds 						      skb->csum);
2711da177e4SLinus Torvalds 	} else {
272868c86bcSAl Viro 		__wsum tmp_csum = 0;
2731da177e4SLinus Torvalds 
2741da177e4SLinus Torvalds 		skb_queue_walk(&sk->sk_write_queue, skb) {
2751da177e4SLinus Torvalds 			tmp_csum = csum_add(tmp_csum, skb->csum);
2761da177e4SLinus Torvalds 		}
2771da177e4SLinus Torvalds 
27807f0757aSJoe Perches 		tmp_csum = csum_partial(icmp6h,
2791da177e4SLinus Torvalds 					sizeof(struct icmp6hdr), tmp_csum);
2804c9483b2SDavid S. Miller 		icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr,
2814c9483b2SDavid S. Miller 						      &fl6->daddr,
2824c9483b2SDavid S. Miller 						      len, fl6->flowi6_proto,
283868c86bcSAl Viro 						      tmp_csum);
2841da177e4SLinus Torvalds 	}
2851da177e4SLinus Torvalds 	ip6_push_pending_frames(sk);
2861da177e4SLinus Torvalds }
2871da177e4SLinus Torvalds 
2881da177e4SLinus Torvalds struct icmpv6_msg {
2891da177e4SLinus Torvalds 	struct sk_buff	*skb;
2901da177e4SLinus Torvalds 	int		offset;
291763ecff1SYasuyuki Kozakai 	uint8_t		type;
2921da177e4SLinus Torvalds };
2931da177e4SLinus Torvalds 
2941da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb)
2951da177e4SLinus Torvalds {
2961da177e4SLinus Torvalds 	struct icmpv6_msg *msg = (struct icmpv6_msg *) from;
2971da177e4SLinus Torvalds 	struct sk_buff *org_skb = msg->skb;
2985f92a738SAl Viro 	__wsum csum = 0;
2991da177e4SLinus Torvalds 
3001da177e4SLinus Torvalds 	csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset,
3011da177e4SLinus Torvalds 				      to, len, csum);
3021da177e4SLinus Torvalds 	skb->csum = csum_block_add(skb->csum, csum, odd);
303763ecff1SYasuyuki Kozakai 	if (!(msg->type & ICMPV6_INFOMSG_MASK))
304763ecff1SYasuyuki Kozakai 		nf_ct_attach(skb, org_skb);
3051da177e4SLinus Torvalds 	return 0;
3061da177e4SLinus Torvalds }
3071da177e4SLinus Torvalds 
30807a93626SAmerigo Wang #if IS_ENABLED(CONFIG_IPV6_MIP6)
30979383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb)
31079383236SMasahide NAKAMURA {
3110660e03fSArnaldo Carvalho de Melo 	struct ipv6hdr *iph = ipv6_hdr(skb);
31279383236SMasahide NAKAMURA 	struct inet6_skb_parm *opt = IP6CB(skb);
31379383236SMasahide NAKAMURA 	struct ipv6_destopt_hao *hao;
31479383236SMasahide NAKAMURA 	struct in6_addr tmp;
31579383236SMasahide NAKAMURA 	int off;
31679383236SMasahide NAKAMURA 
31779383236SMasahide NAKAMURA 	if (opt->dsthao) {
31879383236SMasahide NAKAMURA 		off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO);
31979383236SMasahide NAKAMURA 		if (likely(off >= 0)) {
320d56f90a7SArnaldo Carvalho de Melo 			hao = (struct ipv6_destopt_hao *)
321d56f90a7SArnaldo Carvalho de Melo 					(skb_network_header(skb) + off);
3224e3fd7a0SAlexey Dobriyan 			tmp = iph->saddr;
3234e3fd7a0SAlexey Dobriyan 			iph->saddr = hao->addr;
3244e3fd7a0SAlexey Dobriyan 			hao->addr = tmp;
32579383236SMasahide NAKAMURA 		}
32679383236SMasahide NAKAMURA 	}
32779383236SMasahide NAKAMURA }
32879383236SMasahide NAKAMURA #else
32979383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {}
33079383236SMasahide NAKAMURA #endif
33179383236SMasahide NAKAMURA 
332e8243534Sstephen hemminger static struct dst_entry *icmpv6_route_lookup(struct net *net,
333e8243534Sstephen hemminger 					     struct sk_buff *skb,
334e8243534Sstephen hemminger 					     struct sock *sk,
335e8243534Sstephen hemminger 					     struct flowi6 *fl6)
336b42835dbSDavid S. Miller {
337b42835dbSDavid S. Miller 	struct dst_entry *dst, *dst2;
3384c9483b2SDavid S. Miller 	struct flowi6 fl2;
339b42835dbSDavid S. Miller 	int err;
340b42835dbSDavid S. Miller 
341343d60aaSRoopa Prabhu 	err = ip6_dst_lookup(net, sk, &dst, fl6);
342b42835dbSDavid S. Miller 	if (err)
343b42835dbSDavid S. Miller 		return ERR_PTR(err);
344b42835dbSDavid S. Miller 
345b42835dbSDavid S. Miller 	/*
346b42835dbSDavid S. Miller 	 * We won't send icmp if the destination is known
347b42835dbSDavid S. Miller 	 * anycast.
348b42835dbSDavid S. Miller 	 */
3492647a9b0SMartin KaFai Lau 	if (ipv6_anycast_destination(dst, &fl6->daddr)) {
350ba7a46f1SJoe Perches 		net_dbg_ratelimited("icmp6_send: acast source\n");
351b42835dbSDavid S. Miller 		dst_release(dst);
352b42835dbSDavid S. Miller 		return ERR_PTR(-EINVAL);
353b42835dbSDavid S. Miller 	}
354b42835dbSDavid S. Miller 
355b42835dbSDavid S. Miller 	/* No need to clone since we're just using its address. */
356b42835dbSDavid S. Miller 	dst2 = dst;
357b42835dbSDavid S. Miller 
3584c9483b2SDavid S. Miller 	dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0);
359452edd59SDavid S. Miller 	if (!IS_ERR(dst)) {
360b42835dbSDavid S. Miller 		if (dst != dst2)
361b42835dbSDavid S. Miller 			return dst;
362452edd59SDavid S. Miller 	} else {
363452edd59SDavid S. Miller 		if (PTR_ERR(dst) == -EPERM)
364b42835dbSDavid S. Miller 			dst = NULL;
365452edd59SDavid S. Miller 		else
366452edd59SDavid S. Miller 			return dst;
367b42835dbSDavid S. Miller 	}
368b42835dbSDavid S. Miller 
3694c9483b2SDavid S. Miller 	err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6);
370b42835dbSDavid S. Miller 	if (err)
371b42835dbSDavid S. Miller 		goto relookup_failed;
372b42835dbSDavid S. Miller 
373343d60aaSRoopa Prabhu 	err = ip6_dst_lookup(net, sk, &dst2, &fl2);
374b42835dbSDavid S. Miller 	if (err)
375b42835dbSDavid S. Miller 		goto relookup_failed;
376b42835dbSDavid S. Miller 
3774c9483b2SDavid S. Miller 	dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP);
378452edd59SDavid S. Miller 	if (!IS_ERR(dst2)) {
379b42835dbSDavid S. Miller 		dst_release(dst);
380b42835dbSDavid S. Miller 		dst = dst2;
381452edd59SDavid S. Miller 	} else {
382452edd59SDavid S. Miller 		err = PTR_ERR(dst2);
383452edd59SDavid S. Miller 		if (err == -EPERM) {
384b42835dbSDavid S. Miller 			dst_release(dst);
385452edd59SDavid S. Miller 			return dst2;
386452edd59SDavid S. Miller 		} else
387b42835dbSDavid S. Miller 			goto relookup_failed;
388b42835dbSDavid S. Miller 	}
389b42835dbSDavid S. Miller 
390b42835dbSDavid S. Miller relookup_failed:
391b42835dbSDavid S. Miller 	if (dst)
392b42835dbSDavid S. Miller 		return dst;
393b42835dbSDavid S. Miller 	return ERR_PTR(err);
394b42835dbSDavid S. Miller }
395b42835dbSDavid S. Miller 
3961b70d792SDavid Ahern static int icmp6_iif(const struct sk_buff *skb)
3971b70d792SDavid Ahern {
3981b70d792SDavid Ahern 	int iif = skb->dev->ifindex;
3991b70d792SDavid Ahern 
4001b70d792SDavid Ahern 	/* for local traffic to local address, skb dev is the loopback
4011b70d792SDavid Ahern 	 * device. Check if there is a dst attached to the skb and if so
40224b711edSDavid Ahern 	 * get the real device index. Same is needed for replies to a link
40324b711edSDavid Ahern 	 * local address on a device enslaved to an L3 master device
4041b70d792SDavid Ahern 	 */
40524b711edSDavid Ahern 	if (unlikely(iif == LOOPBACK_IFINDEX || netif_is_l3_master(skb->dev))) {
4061b70d792SDavid Ahern 		const struct rt6_info *rt6 = skb_rt6_info(skb);
4071b70d792SDavid Ahern 
4081b70d792SDavid Ahern 		if (rt6)
4091b70d792SDavid Ahern 			iif = rt6->rt6i_idev->dev->ifindex;
4101b70d792SDavid Ahern 	}
4111b70d792SDavid Ahern 
4121b70d792SDavid Ahern 	return iif;
4131b70d792SDavid Ahern }
4141b70d792SDavid Ahern 
4151da177e4SLinus Torvalds /*
4161da177e4SLinus Torvalds  *	Send an ICMP message in response to a packet in error
4171da177e4SLinus Torvalds  */
418b1cadc1aSEric Dumazet static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info,
419b1cadc1aSEric Dumazet 		       const struct in6_addr *force_saddr)
4201da177e4SLinus Torvalds {
4211da177e4SLinus Torvalds 	struct inet6_dev *idev = NULL;
4220660e03fSArnaldo Carvalho de Melo 	struct ipv6hdr *hdr = ipv6_hdr(skb);
42384427d53SYOSHIFUJI Hideaki 	struct sock *sk;
4248d933670SEric Dumazet 	struct net *net;
42584427d53SYOSHIFUJI Hideaki 	struct ipv6_pinfo *np;
426b71d1d42SEric Dumazet 	const struct in6_addr *saddr = NULL;
4271da177e4SLinus Torvalds 	struct dst_entry *dst;
4281da177e4SLinus Torvalds 	struct icmp6hdr tmp_hdr;
4294c9483b2SDavid S. Miller 	struct flowi6 fl6;
4301da177e4SLinus Torvalds 	struct icmpv6_msg msg;
43126879da5SWei Wang 	struct ipcm6_cookie ipc6;
4321da177e4SLinus Torvalds 	int iif = 0;
4331da177e4SLinus Torvalds 	int addr_type = 0;
4341da177e4SLinus Torvalds 	int len;
4358d933670SEric Dumazet 	u32 mark;
4361da177e4SLinus Torvalds 
43727a884dcSArnaldo Carvalho de Melo 	if ((u8 *)hdr < skb->head ||
43829a3cad5SSimon Horman 	    (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb))
4391da177e4SLinus Torvalds 		return;
4401da177e4SLinus Torvalds 
4418d933670SEric Dumazet 	if (!skb->dev)
4428d933670SEric Dumazet 		return;
4438d933670SEric Dumazet 	net = dev_net(skb->dev);
4448d933670SEric Dumazet 	mark = IP6_REPLY_MARK(net, skb->mark);
4451da177e4SLinus Torvalds 	/*
4461da177e4SLinus Torvalds 	 *	Make sure we respect the rules
4471da177e4SLinus Torvalds 	 *	i.e. RFC 1885 2.4(e)
4485f5624cfSPravin B Shelar 	 *	Rule (e.1) is enforced by not using icmp6_send
4491da177e4SLinus Torvalds 	 *	in any code that processes icmp errors.
4501da177e4SLinus Torvalds 	 */
4511da177e4SLinus Torvalds 	addr_type = ipv6_addr_type(&hdr->daddr);
4521da177e4SLinus Torvalds 
453446fab59SFX Le Bail 	if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) ||
454d94c1f92SFX Le Bail 	    ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr))
4551da177e4SLinus Torvalds 		saddr = &hdr->daddr;
4561da177e4SLinus Torvalds 
4571da177e4SLinus Torvalds 	/*
4581da177e4SLinus Torvalds 	 *	Dest addr check
4591da177e4SLinus Torvalds 	 */
4601da177e4SLinus Torvalds 
4619a6b4b39Szhuyj 	if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) {
4621da177e4SLinus Torvalds 		if (type != ICMPV6_PKT_TOOBIG &&
4631da177e4SLinus Torvalds 		    !(type == ICMPV6_PARAMPROB &&
4641da177e4SLinus Torvalds 		      code == ICMPV6_UNK_OPTION &&
4651da177e4SLinus Torvalds 		      (opt_unrec(skb, info))))
4661da177e4SLinus Torvalds 			return;
4671da177e4SLinus Torvalds 
4681da177e4SLinus Torvalds 		saddr = NULL;
4691da177e4SLinus Torvalds 	}
4701da177e4SLinus Torvalds 
4711da177e4SLinus Torvalds 	addr_type = ipv6_addr_type(&hdr->saddr);
4721da177e4SLinus Torvalds 
4731da177e4SLinus Torvalds 	/*
4741da177e4SLinus Torvalds 	 *	Source addr check
4751da177e4SLinus Torvalds 	 */
4761da177e4SLinus Torvalds 
4774832c30dSDavid Ahern 	if (__ipv6_addr_needs_scope_id(addr_type)) {
4781b70d792SDavid Ahern 		iif = icmp6_iif(skb);
4794832c30dSDavid Ahern 	} else {
48079dc7e3fSDavid Ahern 		dst = skb_dst(skb);
48179dc7e3fSDavid Ahern 		iif = l3mdev_master_ifindex(dst ? dst->dev : skb->dev);
48279dc7e3fSDavid Ahern 	}
4831da177e4SLinus Torvalds 
4841da177e4SLinus Torvalds 	/*
4858de3351eSYOSHIFUJI Hideaki 	 *	Must not send error if the source does not uniquely
4868de3351eSYOSHIFUJI Hideaki 	 *	identify a single node (RFC2463 Section 2.4).
4878de3351eSYOSHIFUJI Hideaki 	 *	We check unspecified / multicast addresses here,
4888de3351eSYOSHIFUJI Hideaki 	 *	and anycast addresses will be checked later.
4891da177e4SLinus Torvalds 	 */
4901da177e4SLinus Torvalds 	if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) {
4914b3418fbSBjørn Mork 		net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n",
4924b3418fbSBjørn Mork 				    &hdr->saddr, &hdr->daddr);
4931da177e4SLinus Torvalds 		return;
4941da177e4SLinus Torvalds 	}
4951da177e4SLinus Torvalds 
4961da177e4SLinus Torvalds 	/*
4971da177e4SLinus Torvalds 	 *	Never answer to a ICMP packet.
4981da177e4SLinus Torvalds 	 */
4991da177e4SLinus Torvalds 	if (is_ineligible(skb)) {
5004b3418fbSBjørn Mork 		net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n",
5014b3418fbSBjørn Mork 				    &hdr->saddr, &hdr->daddr);
5021da177e4SLinus Torvalds 		return;
5031da177e4SLinus Torvalds 	}
5041da177e4SLinus Torvalds 
5057ba91ecbSJesper Dangaard Brouer 	/* Needed by both icmp_global_allow and icmpv6_xmit_lock */
5067ba91ecbSJesper Dangaard Brouer 	local_bh_disable();
5077ba91ecbSJesper Dangaard Brouer 
5087ba91ecbSJesper Dangaard Brouer 	/* Check global sysctl_icmp_msgs_per_sec ratelimit */
5090bc19985SStephen Suryaputra 	if (!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, type))
5107ba91ecbSJesper Dangaard Brouer 		goto out_bh_enable;
5117ba91ecbSJesper Dangaard Brouer 
51279383236SMasahide NAKAMURA 	mip6_addr_swap(skb);
51379383236SMasahide NAKAMURA 
5144c9483b2SDavid S. Miller 	memset(&fl6, 0, sizeof(fl6));
5154c9483b2SDavid S. Miller 	fl6.flowi6_proto = IPPROTO_ICMPV6;
5164e3fd7a0SAlexey Dobriyan 	fl6.daddr = hdr->saddr;
517b1cadc1aSEric Dumazet 	if (force_saddr)
518b1cadc1aSEric Dumazet 		saddr = force_saddr;
5191da177e4SLinus Torvalds 	if (saddr)
5204e3fd7a0SAlexey Dobriyan 		fl6.saddr = *saddr;
521e110861fSLorenzo Colitti 	fl6.flowi6_mark = mark;
5224c9483b2SDavid S. Miller 	fl6.flowi6_oif = iif;
5231958b856SDavid S. Miller 	fl6.fl6_icmp_type = type;
5241958b856SDavid S. Miller 	fl6.fl6_icmp_code = code;
525e2d118a1SLorenzo Colitti 	fl6.flowi6_uid = sock_net_uid(net, NULL);
526b4bac172SDavid Ahern 	fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, NULL);
5274c9483b2SDavid S. Miller 	security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
5281da177e4SLinus Torvalds 
529fdc0bde9SDenis V. Lunev 	sk = icmpv6_xmit_lock(net);
53063159f29SIan Morris 	if (!sk)
5317ba91ecbSJesper Dangaard Brouer 		goto out_bh_enable;
532c0303efeSJesper Dangaard Brouer 
533e110861fSLorenzo Colitti 	sk->sk_mark = mark;
534fdc0bde9SDenis V. Lunev 	np = inet6_sk(sk);
535405666dbSDenis V. Lunev 
5364c9483b2SDavid S. Miller 	if (!icmpv6_xrlim_allow(sk, type, &fl6))
5371da177e4SLinus Torvalds 		goto out;
5381da177e4SLinus Torvalds 
5391da177e4SLinus Torvalds 	tmp_hdr.icmp6_type = type;
5401da177e4SLinus Torvalds 	tmp_hdr.icmp6_code = code;
5411da177e4SLinus Torvalds 	tmp_hdr.icmp6_cksum = 0;
5421da177e4SLinus Torvalds 	tmp_hdr.icmp6_pointer = htonl(info);
5431da177e4SLinus Torvalds 
5444c9483b2SDavid S. Miller 	if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
5454c9483b2SDavid S. Miller 		fl6.flowi6_oif = np->mcast_oif;
546c4062dfcSErich E. Hoover 	else if (!fl6.flowi6_oif)
547c4062dfcSErich E. Hoover 		fl6.flowi6_oif = np->ucast_oif;
5481da177e4SLinus Torvalds 
549b515430aSWillem de Bruijn 	ipcm6_init_sk(&ipc6, np);
55038b7097bSHannes Frederic Sowa 	fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
55138b7097bSHannes Frederic Sowa 
5524c9483b2SDavid S. Miller 	dst = icmpv6_route_lookup(net, skb, sk, &fl6);
553b42835dbSDavid S. Miller 	if (IS_ERR(dst))
5541da177e4SLinus Torvalds 		goto out;
5558de3351eSYOSHIFUJI Hideaki 
55626879da5SWei Wang 	ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
5571da177e4SLinus Torvalds 
5581da177e4SLinus Torvalds 	msg.skb = skb;
559bbe735e4SArnaldo Carvalho de Melo 	msg.offset = skb_network_offset(skb);
560763ecff1SYasuyuki Kozakai 	msg.type = type;
5611da177e4SLinus Torvalds 
5621da177e4SLinus Torvalds 	len = skb->len - msg.offset;
5631da177e4SLinus Torvalds 	len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr));
5641da177e4SLinus Torvalds 	if (len < 0) {
5654b3418fbSBjørn Mork 		net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n",
5664b3418fbSBjørn Mork 				    &hdr->saddr, &hdr->daddr);
5671da177e4SLinus Torvalds 		goto out_dst_release;
5681da177e4SLinus Torvalds 	}
5691da177e4SLinus Torvalds 
570cfdf7647SEric Dumazet 	rcu_read_lock();
571cfdf7647SEric Dumazet 	idev = __in6_dev_get(skb->dev);
5721da177e4SLinus Torvalds 
5734e64b1edSJoe Perches 	if (ip6_append_data(sk, icmpv6_getfrag, &msg,
5741da177e4SLinus Torvalds 			    len + sizeof(struct icmp6hdr),
57526879da5SWei Wang 			    sizeof(struct icmp6hdr),
57626879da5SWei Wang 			    &ipc6, &fl6, (struct rt6_info *)dst,
5775fdaa88dSWillem de Bruijn 			    MSG_DONTWAIT)) {
57843a43b60SHannes Frederic Sowa 		ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS);
5791da177e4SLinus Torvalds 		ip6_flush_pending_frames(sk);
580cfdf7647SEric Dumazet 	} else {
5814e64b1edSJoe Perches 		icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr,
582cfdf7647SEric Dumazet 					   len + sizeof(struct icmp6hdr));
5831da177e4SLinus Torvalds 	}
584cfdf7647SEric Dumazet 	rcu_read_unlock();
5851da177e4SLinus Torvalds out_dst_release:
5861da177e4SLinus Torvalds 	dst_release(dst);
5871da177e4SLinus Torvalds out:
588405666dbSDenis V. Lunev 	icmpv6_xmit_unlock(sk);
5897ba91ecbSJesper Dangaard Brouer out_bh_enable:
5907ba91ecbSJesper Dangaard Brouer 	local_bh_enable();
5911da177e4SLinus Torvalds }
5925f5624cfSPravin B Shelar 
5935f5624cfSPravin B Shelar /* Slightly more convenient version of icmp6_send.
5945f5624cfSPravin B Shelar  */
5955f5624cfSPravin B Shelar void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos)
5965f5624cfSPravin B Shelar {
597b1cadc1aSEric Dumazet 	icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL);
5985f5624cfSPravin B Shelar 	kfree_skb(skb);
5995f5624cfSPravin B Shelar }
6007159039aSYOSHIFUJI Hideaki 
6015fbba8acSEric Dumazet /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH
6025fbba8acSEric Dumazet  * if sufficient data bytes are available
6035fbba8acSEric Dumazet  * @nhs is the size of the tunnel header(s) :
6045fbba8acSEric Dumazet  *  Either an IPv4 header for SIT encap
6055fbba8acSEric Dumazet  *         an IPv4 header + GRE header for GRE encap
6065fbba8acSEric Dumazet  */
60720e1954fSEric Dumazet int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type,
60820e1954fSEric Dumazet 			       unsigned int data_len)
6095fbba8acSEric Dumazet {
6102d7a3b27SEric Dumazet 	struct in6_addr temp_saddr;
6115fbba8acSEric Dumazet 	struct rt6_info *rt;
6125fbba8acSEric Dumazet 	struct sk_buff *skb2;
61320e1954fSEric Dumazet 	u32 info = 0;
6145fbba8acSEric Dumazet 
6155fbba8acSEric Dumazet 	if (!pskb_may_pull(skb, nhs + sizeof(struct ipv6hdr) + 8))
6165fbba8acSEric Dumazet 		return 1;
6175fbba8acSEric Dumazet 
61820e1954fSEric Dumazet 	/* RFC 4884 (partial) support for ICMP extensions */
61920e1954fSEric Dumazet 	if (data_len < 128 || (data_len & 7) || skb->len < data_len)
62020e1954fSEric Dumazet 		data_len = 0;
62120e1954fSEric Dumazet 
62220e1954fSEric Dumazet 	skb2 = data_len ? skb_copy(skb, GFP_ATOMIC) : skb_clone(skb, GFP_ATOMIC);
6235fbba8acSEric Dumazet 
6245fbba8acSEric Dumazet 	if (!skb2)
6255fbba8acSEric Dumazet 		return 1;
6265fbba8acSEric Dumazet 
6275fbba8acSEric Dumazet 	skb_dst_drop(skb2);
6285fbba8acSEric Dumazet 	skb_pull(skb2, nhs);
6295fbba8acSEric Dumazet 	skb_reset_network_header(skb2);
6305fbba8acSEric Dumazet 
631b75cc8f9SDavid Ahern 	rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0,
632b75cc8f9SDavid Ahern 			skb, 0);
6335fbba8acSEric Dumazet 
6345fbba8acSEric Dumazet 	if (rt && rt->dst.dev)
6355fbba8acSEric Dumazet 		skb2->dev = rt->dst.dev;
6365fbba8acSEric Dumazet 
6372d7a3b27SEric Dumazet 	ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr);
63820e1954fSEric Dumazet 
63920e1954fSEric Dumazet 	if (data_len) {
64020e1954fSEric Dumazet 		/* RFC 4884 (partial) support :
64120e1954fSEric Dumazet 		 * insert 0 padding at the end, before the extensions
64220e1954fSEric Dumazet 		 */
64320e1954fSEric Dumazet 		__skb_push(skb2, nhs);
64420e1954fSEric Dumazet 		skb_reset_network_header(skb2);
64520e1954fSEric Dumazet 		memmove(skb2->data, skb2->data + nhs, data_len - nhs);
64620e1954fSEric Dumazet 		memset(skb2->data + data_len - nhs, 0, nhs);
64720e1954fSEric Dumazet 		/* RFC 4884 4.5 : Length is measured in 64-bit words,
64820e1954fSEric Dumazet 		 * and stored in reserved[0]
64920e1954fSEric Dumazet 		 */
65020e1954fSEric Dumazet 		info = (data_len/8) << 24;
65120e1954fSEric Dumazet 	}
6522d7a3b27SEric Dumazet 	if (type == ICMP_TIME_EXCEEDED)
6532d7a3b27SEric Dumazet 		icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT,
65420e1954fSEric Dumazet 			   info, &temp_saddr);
6552d7a3b27SEric Dumazet 	else
6562d7a3b27SEric Dumazet 		icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH,
65720e1954fSEric Dumazet 			   info, &temp_saddr);
6585fbba8acSEric Dumazet 	if (rt)
6595fbba8acSEric Dumazet 		ip6_rt_put(rt);
6605fbba8acSEric Dumazet 
6615fbba8acSEric Dumazet 	kfree_skb(skb2);
6625fbba8acSEric Dumazet 
6635fbba8acSEric Dumazet 	return 0;
6645fbba8acSEric Dumazet }
6655fbba8acSEric Dumazet EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach);
6665fbba8acSEric Dumazet 
6671da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb)
6681da177e4SLinus Torvalds {
669c346dca1SYOSHIFUJI Hideaki 	struct net *net = dev_net(skb->dev);
67084427d53SYOSHIFUJI Hideaki 	struct sock *sk;
6711da177e4SLinus Torvalds 	struct inet6_dev *idev;
67284427d53SYOSHIFUJI Hideaki 	struct ipv6_pinfo *np;
673b71d1d42SEric Dumazet 	const struct in6_addr *saddr = NULL;
674cc70ab26SArnaldo Carvalho de Melo 	struct icmp6hdr *icmph = icmp6_hdr(skb);
6751da177e4SLinus Torvalds 	struct icmp6hdr tmp_hdr;
6764c9483b2SDavid S. Miller 	struct flowi6 fl6;
6771da177e4SLinus Torvalds 	struct icmpv6_msg msg;
6781da177e4SLinus Torvalds 	struct dst_entry *dst;
67926879da5SWei Wang 	struct ipcm6_cookie ipc6;
680e110861fSLorenzo Colitti 	u32 mark = IP6_REPLY_MARK(net, skb->mark);
6810b03a5caSStephen Suryaputra 	bool acast;
6821da177e4SLinus Torvalds 
68303f1ecccSStephen Suryaputra 	if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) &&
68403f1ecccSStephen Suryaputra 	    net->ipv6.sysctl.icmpv6_echo_ignore_multicast)
68503f1ecccSStephen Suryaputra 		return;
68603f1ecccSStephen Suryaputra 
6870660e03fSArnaldo Carvalho de Melo 	saddr = &ipv6_hdr(skb)->daddr;
6881da177e4SLinus Torvalds 
6890b03a5caSStephen Suryaputra 	acast = ipv6_anycast_destination(skb_dst(skb), saddr);
6900b03a5caSStephen Suryaputra 	if (acast && net->ipv6.sysctl.icmpv6_echo_ignore_anycast)
6910b03a5caSStephen Suryaputra 		return;
6920b03a5caSStephen Suryaputra 
693509aba3bSFX Le Bail 	if (!ipv6_unicast_destination(skb) &&
6940b03a5caSStephen Suryaputra 	    !(net->ipv6.sysctl.anycast_src_echo_reply && acast))
6951da177e4SLinus Torvalds 		saddr = NULL;
6961da177e4SLinus Torvalds 
6971da177e4SLinus Torvalds 	memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr));
6981da177e4SLinus Torvalds 	tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY;
6991da177e4SLinus Torvalds 
7004c9483b2SDavid S. Miller 	memset(&fl6, 0, sizeof(fl6));
7014c9483b2SDavid S. Miller 	fl6.flowi6_proto = IPPROTO_ICMPV6;
7024e3fd7a0SAlexey Dobriyan 	fl6.daddr = ipv6_hdr(skb)->saddr;
7031da177e4SLinus Torvalds 	if (saddr)
7044e3fd7a0SAlexey Dobriyan 		fl6.saddr = *saddr;
7051b70d792SDavid Ahern 	fl6.flowi6_oif = icmp6_iif(skb);
7061958b856SDavid S. Miller 	fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY;
707e110861fSLorenzo Colitti 	fl6.flowi6_mark = mark;
708e2d118a1SLorenzo Colitti 	fl6.flowi6_uid = sock_net_uid(net, NULL);
7094c9483b2SDavid S. Miller 	security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
7101da177e4SLinus Torvalds 
7117ba91ecbSJesper Dangaard Brouer 	local_bh_disable();
712fdc0bde9SDenis V. Lunev 	sk = icmpv6_xmit_lock(net);
71363159f29SIan Morris 	if (!sk)
7147ba91ecbSJesper Dangaard Brouer 		goto out_bh_enable;
715e110861fSLorenzo Colitti 	sk->sk_mark = mark;
716fdc0bde9SDenis V. Lunev 	np = inet6_sk(sk);
717405666dbSDenis V. Lunev 
7184c9483b2SDavid S. Miller 	if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
7194c9483b2SDavid S. Miller 		fl6.flowi6_oif = np->mcast_oif;
720c4062dfcSErich E. Hoover 	else if (!fl6.flowi6_oif)
721c4062dfcSErich E. Hoover 		fl6.flowi6_oif = np->ucast_oif;
7221da177e4SLinus Torvalds 
7234e64b1edSJoe Perches 	if (ip6_dst_lookup(net, sk, &dst, &fl6))
7241da177e4SLinus Torvalds 		goto out;
7254c9483b2SDavid S. Miller 	dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0);
726452edd59SDavid S. Miller 	if (IS_ERR(dst))
727e104411bSPatrick McHardy 		goto out;
7281da177e4SLinus Torvalds 
7290bc19985SStephen Suryaputra 	/* Check the ratelimit */
7300bc19985SStephen Suryaputra 	if ((!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, ICMPV6_ECHO_REPLY)) ||
7310bc19985SStephen Suryaputra 	    !icmpv6_xrlim_allow(sk, ICMPV6_ECHO_REPLY, &fl6))
7320bc19985SStephen Suryaputra 		goto out_dst_release;
7330bc19985SStephen Suryaputra 
734cfdf7647SEric Dumazet 	idev = __in6_dev_get(skb->dev);
7351da177e4SLinus Torvalds 
7361da177e4SLinus Torvalds 	msg.skb = skb;
7371da177e4SLinus Torvalds 	msg.offset = 0;
738763ecff1SYasuyuki Kozakai 	msg.type = ICMPV6_ECHO_REPLY;
7391da177e4SLinus Torvalds 
740b515430aSWillem de Bruijn 	ipcm6_init_sk(&ipc6, np);
74126879da5SWei Wang 	ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
74226879da5SWei Wang 	ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb));
74326879da5SWei Wang 
7444e64b1edSJoe Perches 	if (ip6_append_data(sk, icmpv6_getfrag, &msg,
7454e64b1edSJoe Perches 			    skb->len + sizeof(struct icmp6hdr),
74626879da5SWei Wang 			    sizeof(struct icmp6hdr), &ipc6, &fl6,
7475fdaa88dSWillem de Bruijn 			    (struct rt6_info *)dst, MSG_DONTWAIT)) {
748a16292a0SEric Dumazet 		__ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS);
7491da177e4SLinus Torvalds 		ip6_flush_pending_frames(sk);
750cfdf7647SEric Dumazet 	} else {
7514e64b1edSJoe Perches 		icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr,
752cfdf7647SEric Dumazet 					   skb->len + sizeof(struct icmp6hdr));
7531da177e4SLinus Torvalds 	}
7540bc19985SStephen Suryaputra out_dst_release:
7551da177e4SLinus Torvalds 	dst_release(dst);
7561da177e4SLinus Torvalds out:
757405666dbSDenis V. Lunev 	icmpv6_xmit_unlock(sk);
7587ba91ecbSJesper Dangaard Brouer out_bh_enable:
7597ba91ecbSJesper Dangaard Brouer 	local_bh_enable();
7601da177e4SLinus Torvalds }
7611da177e4SLinus Torvalds 
762b94f1c09SDavid S. Miller void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info)
7631da177e4SLinus Torvalds {
76441135cc8SAlexey Dobriyan 	const struct inet6_protocol *ipprot;
7651da177e4SLinus Torvalds 	int inner_offset;
76675f2811cSJesse Gross 	__be16 frag_off;
767f9242b6bSDavid S. Miller 	u8 nexthdr;
7687304fe46SDuan Jiong 	struct net *net = dev_net(skb->dev);
7691da177e4SLinus Torvalds 
7701da177e4SLinus Torvalds 	if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
7717304fe46SDuan Jiong 		goto out;
7721da177e4SLinus Torvalds 
7731da177e4SLinus Torvalds 	nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr;
7741da177e4SLinus Torvalds 	if (ipv6_ext_hdr(nexthdr)) {
7751da177e4SLinus Torvalds 		/* now skip over extension headers */
77675f2811cSJesse Gross 		inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr),
77775f2811cSJesse Gross 						&nexthdr, &frag_off);
7781da177e4SLinus Torvalds 		if (inner_offset < 0)
7797304fe46SDuan Jiong 			goto out;
7801da177e4SLinus Torvalds 	} else {
7811da177e4SLinus Torvalds 		inner_offset = sizeof(struct ipv6hdr);
7821da177e4SLinus Torvalds 	}
7831da177e4SLinus Torvalds 
7841da177e4SLinus Torvalds 	/* Checkin header including 8 bytes of inner protocol header. */
7851da177e4SLinus Torvalds 	if (!pskb_may_pull(skb, inner_offset+8))
7867304fe46SDuan Jiong 		goto out;
7871da177e4SLinus Torvalds 
7881da177e4SLinus Torvalds 	/* BUGGG_FUTURE: we should try to parse exthdrs in this packet.
7891da177e4SLinus Torvalds 	   Without this we will not able f.e. to make source routed
7901da177e4SLinus Torvalds 	   pmtu discovery.
7911da177e4SLinus Torvalds 	   Corresponding argument (opt) to notifiers is already added.
7921da177e4SLinus Torvalds 	   --ANK (980726)
7931da177e4SLinus Torvalds 	 */
7941da177e4SLinus Torvalds 
795f9242b6bSDavid S. Miller 	ipprot = rcu_dereference(inet6_protos[nexthdr]);
7961da177e4SLinus Torvalds 	if (ipprot && ipprot->err_handler)
7971da177e4SLinus Torvalds 		ipprot->err_handler(skb, NULL, type, code, inner_offset, info);
7981da177e4SLinus Torvalds 
79969d6da0bSPavel Emelyanov 	raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info);
8007304fe46SDuan Jiong 	return;
8017304fe46SDuan Jiong 
8027304fe46SDuan Jiong out:
803a16292a0SEric Dumazet 	__ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
8041da177e4SLinus Torvalds }
8051da177e4SLinus Torvalds 
8061da177e4SLinus Torvalds /*
8071da177e4SLinus Torvalds  *	Handle icmp messages
8081da177e4SLinus Torvalds  */
8091da177e4SLinus Torvalds 
810e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb)
8111da177e4SLinus Torvalds {
812e6f86b0fSVirgile Jarry 	struct net *net = dev_net(skb->dev);
8131da177e4SLinus Torvalds 	struct net_device *dev = skb->dev;
8141da177e4SLinus Torvalds 	struct inet6_dev *idev = __in6_dev_get(dev);
815b71d1d42SEric Dumazet 	const struct in6_addr *saddr, *daddr;
8161da177e4SLinus Torvalds 	struct icmp6hdr *hdr;
817d5fdd6baSBrian Haley 	u8 type;
818e3e32170SRick Jones 	bool success = false;
8191da177e4SLinus Torvalds 
820aebcf82cSHerbert Xu 	if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
821def8b4faSAlexey Dobriyan 		struct sec_path *sp = skb_sec_path(skb);
8228b7817f3SHerbert Xu 		int nh;
8238b7817f3SHerbert Xu 
824def8b4faSAlexey Dobriyan 		if (!(sp && sp->xvec[sp->len - 1]->props.flags &
825aebcf82cSHerbert Xu 				 XFRM_STATE_ICMP))
826aebcf82cSHerbert Xu 			goto drop_no_count;
827aebcf82cSHerbert Xu 
82881aded24SDavid S. Miller 		if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr)))
8298b7817f3SHerbert Xu 			goto drop_no_count;
8308b7817f3SHerbert Xu 
8318b7817f3SHerbert Xu 		nh = skb_network_offset(skb);
8328b7817f3SHerbert Xu 		skb_set_network_header(skb, sizeof(*hdr));
8338b7817f3SHerbert Xu 
8348b7817f3SHerbert Xu 		if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb))
8358b7817f3SHerbert Xu 			goto drop_no_count;
8368b7817f3SHerbert Xu 
8378b7817f3SHerbert Xu 		skb_set_network_header(skb, nh);
8388b7817f3SHerbert Xu 	}
8398b7817f3SHerbert Xu 
840a16292a0SEric Dumazet 	__ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS);
8411da177e4SLinus Torvalds 
8420660e03fSArnaldo Carvalho de Melo 	saddr = &ipv6_hdr(skb)->saddr;
8430660e03fSArnaldo Carvalho de Melo 	daddr = &ipv6_hdr(skb)->daddr;
8441da177e4SLinus Torvalds 
84539471ac8STom Herbert 	if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) {
846ba7a46f1SJoe Perches 		net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n",
8470c6ce78aSHarvey Harrison 				    saddr, daddr);
8486a5dc9e5SEric Dumazet 		goto csum_error;
8491da177e4SLinus Torvalds 	}
8501da177e4SLinus Torvalds 
8518cf22943SHerbert Xu 	if (!pskb_pull(skb, sizeof(*hdr)))
8528cf22943SHerbert Xu 		goto discard_it;
8531da177e4SLinus Torvalds 
854cc70ab26SArnaldo Carvalho de Melo 	hdr = icmp6_hdr(skb);
8551da177e4SLinus Torvalds 
8561da177e4SLinus Torvalds 	type = hdr->icmp6_type;
8571da177e4SLinus Torvalds 
858f3832ed2SEric Dumazet 	ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type);
8591da177e4SLinus Torvalds 
8601da177e4SLinus Torvalds 	switch (type) {
8611da177e4SLinus Torvalds 	case ICMPV6_ECHO_REQUEST:
862e6f86b0fSVirgile Jarry 		if (!net->ipv6.sysctl.icmpv6_echo_ignore_all)
8631da177e4SLinus Torvalds 			icmpv6_echo_reply(skb);
8641da177e4SLinus Torvalds 		break;
8651da177e4SLinus Torvalds 
8661da177e4SLinus Torvalds 	case ICMPV6_ECHO_REPLY:
867e3e32170SRick Jones 		success = ping_rcv(skb);
8681da177e4SLinus Torvalds 		break;
8691da177e4SLinus Torvalds 
8701da177e4SLinus Torvalds 	case ICMPV6_PKT_TOOBIG:
8711da177e4SLinus Torvalds 		/* BUGGG_FUTURE: if packet contains rthdr, we cannot update
8721da177e4SLinus Torvalds 		   standard destination cache. Seems, only "advanced"
8731da177e4SLinus Torvalds 		   destination cache will allow to solve this problem
8741da177e4SLinus Torvalds 		   --ANK (980726)
8751da177e4SLinus Torvalds 		 */
8761da177e4SLinus Torvalds 		if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
8771da177e4SLinus Torvalds 			goto discard_it;
878cc70ab26SArnaldo Carvalho de Melo 		hdr = icmp6_hdr(skb);
8791da177e4SLinus Torvalds 
880275757e6SGustavo A. R. Silva 		/* to notify */
881275757e6SGustavo A. R. Silva 		/* fall through */
8821da177e4SLinus Torvalds 	case ICMPV6_DEST_UNREACH:
8831da177e4SLinus Torvalds 	case ICMPV6_TIME_EXCEED:
8841da177e4SLinus Torvalds 	case ICMPV6_PARAMPROB:
8851da177e4SLinus Torvalds 		icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu);
8861da177e4SLinus Torvalds 		break;
8871da177e4SLinus Torvalds 
8881da177e4SLinus Torvalds 	case NDISC_ROUTER_SOLICITATION:
8891da177e4SLinus Torvalds 	case NDISC_ROUTER_ADVERTISEMENT:
8901da177e4SLinus Torvalds 	case NDISC_NEIGHBOUR_SOLICITATION:
8911da177e4SLinus Torvalds 	case NDISC_NEIGHBOUR_ADVERTISEMENT:
8921da177e4SLinus Torvalds 	case NDISC_REDIRECT:
8931da177e4SLinus Torvalds 		ndisc_rcv(skb);
8941da177e4SLinus Torvalds 		break;
8951da177e4SLinus Torvalds 
8961da177e4SLinus Torvalds 	case ICMPV6_MGM_QUERY:
8971da177e4SLinus Torvalds 		igmp6_event_query(skb);
8981da177e4SLinus Torvalds 		break;
8991da177e4SLinus Torvalds 
9001da177e4SLinus Torvalds 	case ICMPV6_MGM_REPORT:
9011da177e4SLinus Torvalds 		igmp6_event_report(skb);
9021da177e4SLinus Torvalds 		break;
9031da177e4SLinus Torvalds 
9041da177e4SLinus Torvalds 	case ICMPV6_MGM_REDUCTION:
9051da177e4SLinus Torvalds 	case ICMPV6_NI_QUERY:
9061da177e4SLinus Torvalds 	case ICMPV6_NI_REPLY:
9071da177e4SLinus Torvalds 	case ICMPV6_MLD2_REPORT:
9081da177e4SLinus Torvalds 	case ICMPV6_DHAAD_REQUEST:
9091da177e4SLinus Torvalds 	case ICMPV6_DHAAD_REPLY:
9101da177e4SLinus Torvalds 	case ICMPV6_MOBILE_PREFIX_SOL:
9111da177e4SLinus Torvalds 	case ICMPV6_MOBILE_PREFIX_ADV:
9121da177e4SLinus Torvalds 		break;
9131da177e4SLinus Torvalds 
9141da177e4SLinus Torvalds 	default:
9151da177e4SLinus Torvalds 		/* informational */
9161da177e4SLinus Torvalds 		if (type & ICMPV6_INFOMSG_MASK)
9171da177e4SLinus Torvalds 			break;
9181da177e4SLinus Torvalds 
9194b3418fbSBjørn Mork 		net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n",
9204b3418fbSBjørn Mork 				    saddr, daddr);
921ea85a0a2SDavid S. Miller 
9221da177e4SLinus Torvalds 		/*
9231da177e4SLinus Torvalds 		 * error of unknown type.
9241da177e4SLinus Torvalds 		 * must pass to upper level
9251da177e4SLinus Torvalds 		 */
9261da177e4SLinus Torvalds 
9271da177e4SLinus Torvalds 		icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu);
9283ff50b79SStephen Hemminger 	}
9293ff50b79SStephen Hemminger 
930e3e32170SRick Jones 	/* until the v6 path can be better sorted assume failure and
931e3e32170SRick Jones 	 * preserve the status quo behaviour for the rest of the paths to here
932e3e32170SRick Jones 	 */
933e3e32170SRick Jones 	if (success)
934e3e32170SRick Jones 		consume_skb(skb);
935e3e32170SRick Jones 	else
9361da177e4SLinus Torvalds 		kfree_skb(skb);
937e3e32170SRick Jones 
9381da177e4SLinus Torvalds 	return 0;
9391da177e4SLinus Torvalds 
9406a5dc9e5SEric Dumazet csum_error:
941a16292a0SEric Dumazet 	__ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS);
9421da177e4SLinus Torvalds discard_it:
943a16292a0SEric Dumazet 	__ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS);
9448b7817f3SHerbert Xu drop_no_count:
9451da177e4SLinus Torvalds 	kfree_skb(skb);
9461da177e4SLinus Torvalds 	return 0;
9471da177e4SLinus Torvalds }
9481da177e4SLinus Torvalds 
9494c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6,
95095e41e93SYOSHIFUJI Hideaki 		      u8 type,
95195e41e93SYOSHIFUJI Hideaki 		      const struct in6_addr *saddr,
95295e41e93SYOSHIFUJI Hideaki 		      const struct in6_addr *daddr,
95395e41e93SYOSHIFUJI Hideaki 		      int oif)
95495e41e93SYOSHIFUJI Hideaki {
9554c9483b2SDavid S. Miller 	memset(fl6, 0, sizeof(*fl6));
9564e3fd7a0SAlexey Dobriyan 	fl6->saddr = *saddr;
9574e3fd7a0SAlexey Dobriyan 	fl6->daddr = *daddr;
9584c9483b2SDavid S. Miller 	fl6->flowi6_proto	= IPPROTO_ICMPV6;
9591958b856SDavid S. Miller 	fl6->fl6_icmp_type	= type;
9601958b856SDavid S. Miller 	fl6->fl6_icmp_code	= 0;
9614c9483b2SDavid S. Miller 	fl6->flowi6_oif		= oif;
9624c9483b2SDavid S. Miller 	security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
96395e41e93SYOSHIFUJI Hideaki }
96495e41e93SYOSHIFUJI Hideaki 
9653232a1efSKefeng Wang static void __net_exit icmpv6_sk_exit(struct net *net)
9663232a1efSKefeng Wang {
9673232a1efSKefeng Wang 	int i;
9683232a1efSKefeng Wang 
9693232a1efSKefeng Wang 	for_each_possible_cpu(i)
97075efc250SKefeng Wang 		inet_ctl_sock_destroy(*per_cpu_ptr(net->ipv6.icmp_sk, i));
97175efc250SKefeng Wang 	free_percpu(net->ipv6.icmp_sk);
9723232a1efSKefeng Wang }
9733232a1efSKefeng Wang 
97498c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net)
9751da177e4SLinus Torvalds {
9761da177e4SLinus Torvalds 	struct sock *sk;
9773232a1efSKefeng Wang 	int err, i;
9781da177e4SLinus Torvalds 
97975efc250SKefeng Wang 	net->ipv6.icmp_sk = alloc_percpu(struct sock *);
98063159f29SIan Morris 	if (!net->ipv6.icmp_sk)
98179c91159SDenis V. Lunev 		return -ENOMEM;
98279c91159SDenis V. Lunev 
9836f912042SKAMEZAWA Hiroyuki 	for_each_possible_cpu(i) {
9841ed8516fSDenis V. Lunev 		err = inet_ctl_sock_create(&sk, PF_INET6,
9851ed8516fSDenis V. Lunev 					   SOCK_RAW, IPPROTO_ICMPV6, net);
9861da177e4SLinus Torvalds 		if (err < 0) {
987f3213831SJoe Perches 			pr_err("Failed to initialize the ICMP6 control socket (err %d)\n",
9881da177e4SLinus Torvalds 			       err);
9891da177e4SLinus Torvalds 			goto fail;
9901da177e4SLinus Torvalds 		}
9911da177e4SLinus Torvalds 
99275efc250SKefeng Wang 		*per_cpu_ptr(net->ipv6.icmp_sk, i) = sk;
9935c8cafd6SDenis V. Lunev 
9941da177e4SLinus Torvalds 		/* Enough space for 2 64K ICMP packets, including
9951da177e4SLinus Torvalds 		 * sk_buff struct overhead.
9961da177e4SLinus Torvalds 		 */
99787fb4b7bSEric Dumazet 		sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024);
9981da177e4SLinus Torvalds 	}
9991da177e4SLinus Torvalds 	return 0;
10001da177e4SLinus Torvalds 
10011da177e4SLinus Torvalds  fail:
10023232a1efSKefeng Wang 	icmpv6_sk_exit(net);
10031da177e4SLinus Torvalds 	return err;
10041da177e4SLinus Torvalds }
10051da177e4SLinus Torvalds 
10068ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = {
100798c6d1b2SDenis V. Lunev 	.init = icmpv6_sk_init,
100898c6d1b2SDenis V. Lunev 	.exit = icmpv6_sk_exit,
100998c6d1b2SDenis V. Lunev };
101098c6d1b2SDenis V. Lunev 
101198c6d1b2SDenis V. Lunev int __init icmpv6_init(void)
101298c6d1b2SDenis V. Lunev {
101398c6d1b2SDenis V. Lunev 	int err;
101498c6d1b2SDenis V. Lunev 
101598c6d1b2SDenis V. Lunev 	err = register_pernet_subsys(&icmpv6_sk_ops);
101698c6d1b2SDenis V. Lunev 	if (err < 0)
101798c6d1b2SDenis V. Lunev 		return err;
101898c6d1b2SDenis V. Lunev 
101998c6d1b2SDenis V. Lunev 	err = -EAGAIN;
102098c6d1b2SDenis V. Lunev 	if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0)
102198c6d1b2SDenis V. Lunev 		goto fail;
10225f5624cfSPravin B Shelar 
10235f5624cfSPravin B Shelar 	err = inet6_register_icmp_sender(icmp6_send);
10245f5624cfSPravin B Shelar 	if (err)
10255f5624cfSPravin B Shelar 		goto sender_reg_err;
102698c6d1b2SDenis V. Lunev 	return 0;
102798c6d1b2SDenis V. Lunev 
10285f5624cfSPravin B Shelar sender_reg_err:
10295f5624cfSPravin B Shelar 	inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6);
103098c6d1b2SDenis V. Lunev fail:
1031f3213831SJoe Perches 	pr_err("Failed to register ICMP6 protocol\n");
103298c6d1b2SDenis V. Lunev 	unregister_pernet_subsys(&icmpv6_sk_ops);
103398c6d1b2SDenis V. Lunev 	return err;
103498c6d1b2SDenis V. Lunev }
103598c6d1b2SDenis V. Lunev 
10368ed7edceSAlexey Dobriyan void icmpv6_cleanup(void)
103798c6d1b2SDenis V. Lunev {
10385f5624cfSPravin B Shelar 	inet6_unregister_icmp_sender(icmp6_send);
103998c6d1b2SDenis V. Lunev 	unregister_pernet_subsys(&icmpv6_sk_ops);
10401da177e4SLinus Torvalds 	inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6);
10411da177e4SLinus Torvalds }
10421da177e4SLinus Torvalds 
104398c6d1b2SDenis V. Lunev 
10449b5b5cffSArjan van de Ven static const struct icmp6_err {
10451da177e4SLinus Torvalds 	int err;
10461da177e4SLinus Torvalds 	int fatal;
10471da177e4SLinus Torvalds } tab_unreach[] = {
10481da177e4SLinus Torvalds 	{	/* NOROUTE */
10491da177e4SLinus Torvalds 		.err	= ENETUNREACH,
10501da177e4SLinus Torvalds 		.fatal	= 0,
10511da177e4SLinus Torvalds 	},
10521da177e4SLinus Torvalds 	{	/* ADM_PROHIBITED */
10531da177e4SLinus Torvalds 		.err	= EACCES,
10541da177e4SLinus Torvalds 		.fatal	= 1,
10551da177e4SLinus Torvalds 	},
10561da177e4SLinus Torvalds 	{	/* Was NOT_NEIGHBOUR, now reserved */
10571da177e4SLinus Torvalds 		.err	= EHOSTUNREACH,
10581da177e4SLinus Torvalds 		.fatal	= 0,
10591da177e4SLinus Torvalds 	},
10601da177e4SLinus Torvalds 	{	/* ADDR_UNREACH	*/
10611da177e4SLinus Torvalds 		.err	= EHOSTUNREACH,
10621da177e4SLinus Torvalds 		.fatal	= 0,
10631da177e4SLinus Torvalds 	},
10641da177e4SLinus Torvalds 	{	/* PORT_UNREACH	*/
10651da177e4SLinus Torvalds 		.err	= ECONNREFUSED,
10661da177e4SLinus Torvalds 		.fatal	= 1,
10671da177e4SLinus Torvalds 	},
106861e76b17SJiri Bohac 	{	/* POLICY_FAIL */
106961e76b17SJiri Bohac 		.err	= EACCES,
107061e76b17SJiri Bohac 		.fatal	= 1,
107161e76b17SJiri Bohac 	},
107261e76b17SJiri Bohac 	{	/* REJECT_ROUTE	*/
107361e76b17SJiri Bohac 		.err	= EACCES,
107461e76b17SJiri Bohac 		.fatal	= 1,
107561e76b17SJiri Bohac 	},
10761da177e4SLinus Torvalds };
10771da177e4SLinus Torvalds 
1078d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err)
10791da177e4SLinus Torvalds {
10801da177e4SLinus Torvalds 	int fatal = 0;
10811da177e4SLinus Torvalds 
10821da177e4SLinus Torvalds 	*err = EPROTO;
10831da177e4SLinus Torvalds 
10841da177e4SLinus Torvalds 	switch (type) {
10851da177e4SLinus Torvalds 	case ICMPV6_DEST_UNREACH:
10861da177e4SLinus Torvalds 		fatal = 1;
108761e76b17SJiri Bohac 		if (code < ARRAY_SIZE(tab_unreach)) {
10881da177e4SLinus Torvalds 			*err  = tab_unreach[code].err;
10891da177e4SLinus Torvalds 			fatal = tab_unreach[code].fatal;
10901da177e4SLinus Torvalds 		}
10911da177e4SLinus Torvalds 		break;
10921da177e4SLinus Torvalds 
10931da177e4SLinus Torvalds 	case ICMPV6_PKT_TOOBIG:
10941da177e4SLinus Torvalds 		*err = EMSGSIZE;
10951da177e4SLinus Torvalds 		break;
10961da177e4SLinus Torvalds 
10971da177e4SLinus Torvalds 	case ICMPV6_PARAMPROB:
10981da177e4SLinus Torvalds 		*err = EPROTO;
10991da177e4SLinus Torvalds 		fatal = 1;
11001da177e4SLinus Torvalds 		break;
11011da177e4SLinus Torvalds 
11021da177e4SLinus Torvalds 	case ICMPV6_TIME_EXCEED:
11031da177e4SLinus Torvalds 		*err = EHOSTUNREACH;
11041da177e4SLinus Torvalds 		break;
11053ff50b79SStephen Hemminger 	}
11061da177e4SLinus Torvalds 
11071da177e4SLinus Torvalds 	return fatal;
11081da177e4SLinus Torvalds }
11097159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert);
11107159039aSYOSHIFUJI Hideaki 
11111da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL
1112e8243534Sstephen hemminger static struct ctl_table ipv6_icmp_table_template[] = {
11131da177e4SLinus Torvalds 	{
11141da177e4SLinus Torvalds 		.procname	= "ratelimit",
111541a76906SDaniel Lezcano 		.data		= &init_net.ipv6.sysctl.icmpv6_time,
11161da177e4SLinus Torvalds 		.maxlen		= sizeof(int),
11171da177e4SLinus Torvalds 		.mode		= 0644,
11186d9f239aSAlexey Dobriyan 		.proc_handler	= proc_dointvec_ms_jiffies,
11191da177e4SLinus Torvalds 	},
1120e6f86b0fSVirgile Jarry 	{
1121e6f86b0fSVirgile Jarry 		.procname	= "echo_ignore_all",
1122e6f86b0fSVirgile Jarry 		.data		= &init_net.ipv6.sysctl.icmpv6_echo_ignore_all,
1123e6f86b0fSVirgile Jarry 		.maxlen		= sizeof(int),
1124e6f86b0fSVirgile Jarry 		.mode		= 0644,
1125e6f86b0fSVirgile Jarry 		.proc_handler = proc_dointvec,
1126e6f86b0fSVirgile Jarry 	},
112703f1ecccSStephen Suryaputra 	{
112803f1ecccSStephen Suryaputra 		.procname	= "echo_ignore_multicast",
112903f1ecccSStephen Suryaputra 		.data		= &init_net.ipv6.sysctl.icmpv6_echo_ignore_multicast,
113003f1ecccSStephen Suryaputra 		.maxlen		= sizeof(int),
113103f1ecccSStephen Suryaputra 		.mode		= 0644,
113203f1ecccSStephen Suryaputra 		.proc_handler = proc_dointvec,
113303f1ecccSStephen Suryaputra 	},
11340b03a5caSStephen Suryaputra 	{
11350b03a5caSStephen Suryaputra 		.procname	= "echo_ignore_anycast",
11360b03a5caSStephen Suryaputra 		.data		= &init_net.ipv6.sysctl.icmpv6_echo_ignore_anycast,
11370b03a5caSStephen Suryaputra 		.maxlen		= sizeof(int),
11380b03a5caSStephen Suryaputra 		.mode		= 0644,
11390b03a5caSStephen Suryaputra 		.proc_handler = proc_dointvec,
11400b03a5caSStephen Suryaputra 	},
11410bc19985SStephen Suryaputra 	{
11420bc19985SStephen Suryaputra 		.procname	= "ratemask",
11430bc19985SStephen Suryaputra 		.data		= &init_net.ipv6.sysctl.icmpv6_ratemask_ptr,
11440bc19985SStephen Suryaputra 		.maxlen		= ICMPV6_MSG_MAX + 1,
11450bc19985SStephen Suryaputra 		.mode		= 0644,
11460bc19985SStephen Suryaputra 		.proc_handler = proc_do_large_bitmap,
11470bc19985SStephen Suryaputra 	},
1148f8572d8fSEric W. Biederman 	{ },
11491da177e4SLinus Torvalds };
1150760f2d01SDaniel Lezcano 
11512c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net)
1152760f2d01SDaniel Lezcano {
1153760f2d01SDaniel Lezcano 	struct ctl_table *table;
1154760f2d01SDaniel Lezcano 
1155760f2d01SDaniel Lezcano 	table = kmemdup(ipv6_icmp_table_template,
1156760f2d01SDaniel Lezcano 			sizeof(ipv6_icmp_table_template),
1157760f2d01SDaniel Lezcano 			GFP_KERNEL);
11585ee09105SYOSHIFUJI Hideaki 
1159e6f86b0fSVirgile Jarry 	if (table) {
11605ee09105SYOSHIFUJI Hideaki 		table[0].data = &net->ipv6.sysctl.icmpv6_time;
1161e6f86b0fSVirgile Jarry 		table[1].data = &net->ipv6.sysctl.icmpv6_echo_ignore_all;
116203f1ecccSStephen Suryaputra 		table[2].data = &net->ipv6.sysctl.icmpv6_echo_ignore_multicast;
11630b03a5caSStephen Suryaputra 		table[3].data = &net->ipv6.sysctl.icmpv6_echo_ignore_anycast;
11640bc19985SStephen Suryaputra 		table[4].data = &net->ipv6.sysctl.icmpv6_ratemask_ptr;
1165e6f86b0fSVirgile Jarry 	}
1166760f2d01SDaniel Lezcano 	return table;
1167760f2d01SDaniel Lezcano }
11681da177e4SLinus Torvalds #endif
1169