11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * Internet Control Message Protocol (ICMPv6) 31da177e4SLinus Torvalds * Linux INET6 implementation 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Authors: 61da177e4SLinus Torvalds * Pedro Roque <roque@di.fc.ul.pt> 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * Based on net/ipv4/icmp.c 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * RFC 1885 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 131da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 141da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 151da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 161da177e4SLinus Torvalds */ 171da177e4SLinus Torvalds 181da177e4SLinus Torvalds /* 191da177e4SLinus Torvalds * Changes: 201da177e4SLinus Torvalds * 211da177e4SLinus Torvalds * Andi Kleen : exception handling 221da177e4SLinus Torvalds * Andi Kleen add rate limits. never reply to a icmp. 231da177e4SLinus Torvalds * add more length checks and other fixes. 241da177e4SLinus Torvalds * yoshfuji : ensure to sent parameter problem for 251da177e4SLinus Torvalds * fragments. 261da177e4SLinus Torvalds * YOSHIFUJI Hideaki @USAGI: added sysctl for icmp rate limit. 271da177e4SLinus Torvalds * Randy Dunlap and 281da177e4SLinus Torvalds * YOSHIFUJI Hideaki @USAGI: Per-interface statistics support 291da177e4SLinus Torvalds * Kazunori MIYAZAWA @USAGI: change output process to use ip6_append_data 301da177e4SLinus Torvalds */ 311da177e4SLinus Torvalds 32f3213831SJoe Perches #define pr_fmt(fmt) "IPv6: " fmt 33f3213831SJoe Perches 341da177e4SLinus Torvalds #include <linux/module.h> 351da177e4SLinus Torvalds #include <linux/errno.h> 361da177e4SLinus Torvalds #include <linux/types.h> 371da177e4SLinus Torvalds #include <linux/socket.h> 381da177e4SLinus Torvalds #include <linux/in.h> 391da177e4SLinus Torvalds #include <linux/kernel.h> 401da177e4SLinus Torvalds #include <linux/sockios.h> 411da177e4SLinus Torvalds #include <linux/net.h> 421da177e4SLinus Torvalds #include <linux/skbuff.h> 431da177e4SLinus Torvalds #include <linux/init.h> 44763ecff1SYasuyuki Kozakai #include <linux/netfilter.h> 455a0e3ad6STejun Heo #include <linux/slab.h> 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 481da177e4SLinus Torvalds #include <linux/sysctl.h> 491da177e4SLinus Torvalds #endif 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds #include <linux/inet.h> 521da177e4SLinus Torvalds #include <linux/netdevice.h> 531da177e4SLinus Torvalds #include <linux/icmpv6.h> 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds #include <net/ip.h> 561da177e4SLinus Torvalds #include <net/sock.h> 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds #include <net/ipv6.h> 591da177e4SLinus Torvalds #include <net/ip6_checksum.h> 606d0bfe22SLorenzo Colitti #include <net/ping.h> 611da177e4SLinus Torvalds #include <net/protocol.h> 621da177e4SLinus Torvalds #include <net/raw.h> 631da177e4SLinus Torvalds #include <net/rawv6.h> 641da177e4SLinus Torvalds #include <net/transp_v6.h> 651da177e4SLinus Torvalds #include <net/ip6_route.h> 661da177e4SLinus Torvalds #include <net/addrconf.h> 671da177e4SLinus Torvalds #include <net/icmp.h> 688b7817f3SHerbert Xu #include <net/xfrm.h> 691ed8516fSDenis V. Lunev #include <net/inet_common.h> 70825edac4SHannes Frederic Sowa #include <net/dsfield.h> 71ca254490SDavid Ahern #include <net/l3mdev.h> 721da177e4SLinus Torvalds 737c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds /* 761da177e4SLinus Torvalds * The ICMP socket(s). This is the most convenient way to flow control 771da177e4SLinus Torvalds * our ICMP output as well as maintain a clean interface throughout 781da177e4SLinus Torvalds * all layers. All Socketless IP sends will soon be gone. 791da177e4SLinus Torvalds * 801da177e4SLinus Torvalds * On SMP we have one ICMP socket per-cpu. 811da177e4SLinus Torvalds */ 8298c6d1b2SDenis V. Lunev static inline struct sock *icmpv6_sk(struct net *net) 8398c6d1b2SDenis V. Lunev { 8498c6d1b2SDenis V. Lunev return net->ipv6.icmp_sk[smp_processor_id()]; 8598c6d1b2SDenis V. Lunev } 861da177e4SLinus Torvalds 876f809da2SSteffen Klassert static void icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 886f809da2SSteffen Klassert u8 type, u8 code, int offset, __be32 info) 896f809da2SSteffen Klassert { 906d0bfe22SLorenzo Colitti /* icmpv6_notify checks 8 bytes can be pulled, icmp6hdr is 8 bytes */ 916d0bfe22SLorenzo Colitti struct icmp6hdr *icmp6 = (struct icmp6hdr *) (skb->data + offset); 926f809da2SSteffen Klassert struct net *net = dev_net(skb->dev); 936f809da2SSteffen Klassert 946f809da2SSteffen Klassert if (type == ICMPV6_PKT_TOOBIG) 95e2d118a1SLorenzo Colitti ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); 966f809da2SSteffen Klassert else if (type == NDISC_REDIRECT) 97e2d118a1SLorenzo Colitti ip6_redirect(skb, net, skb->dev->ifindex, 0, 98e2d118a1SLorenzo Colitti sock_net_uid(net, NULL)); 996d0bfe22SLorenzo Colitti 1006d0bfe22SLorenzo Colitti if (!(type & ICMPV6_INFOMSG_MASK)) 1016d0bfe22SLorenzo Colitti if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST) 102dcb94b88SHannes Frederic Sowa ping_err(skb, offset, ntohl(info)); 1036f809da2SSteffen Klassert } 1046f809da2SSteffen Klassert 105e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb); 1061da177e4SLinus Torvalds 10741135cc8SAlexey Dobriyan static const struct inet6_protocol icmpv6_protocol = { 1081da177e4SLinus Torvalds .handler = icmpv6_rcv, 1096f809da2SSteffen Klassert .err_handler = icmpv6_err, 1108b7817f3SHerbert Xu .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1111da177e4SLinus Torvalds }; 1121da177e4SLinus Torvalds 113fdc0bde9SDenis V. Lunev static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) 1141da177e4SLinus Torvalds { 115fdc0bde9SDenis V. Lunev struct sock *sk; 116fdc0bde9SDenis V. Lunev 1171da177e4SLinus Torvalds local_bh_disable(); 1181da177e4SLinus Torvalds 119fdc0bde9SDenis V. Lunev sk = icmpv6_sk(net); 120405666dbSDenis V. Lunev if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { 1211da177e4SLinus Torvalds /* This can happen if the output path (f.e. SIT or 1221da177e4SLinus Torvalds * ip6ip6 tunnel) signals dst_link_failure() for an 1231da177e4SLinus Torvalds * outgoing ICMP6 packet. 1241da177e4SLinus Torvalds */ 1251da177e4SLinus Torvalds local_bh_enable(); 126fdc0bde9SDenis V. Lunev return NULL; 1271da177e4SLinus Torvalds } 128fdc0bde9SDenis V. Lunev return sk; 1291da177e4SLinus Torvalds } 1301da177e4SLinus Torvalds 131405666dbSDenis V. Lunev static __inline__ void icmpv6_xmit_unlock(struct sock *sk) 1321da177e4SLinus Torvalds { 133405666dbSDenis V. Lunev spin_unlock_bh(&sk->sk_lock.slock); 1341da177e4SLinus Torvalds } 1351da177e4SLinus Torvalds 1361da177e4SLinus Torvalds /* 1371da177e4SLinus Torvalds * Figure out, may we reply to this packet with icmp error. 1381da177e4SLinus Torvalds * 1391da177e4SLinus Torvalds * We do not reply, if: 1401da177e4SLinus Torvalds * - it was icmp error message. 1411da177e4SLinus Torvalds * - it is truncated, so that it is known, that protocol is ICMPV6 1421da177e4SLinus Torvalds * (i.e. in the middle of some exthdr) 1431da177e4SLinus Torvalds * 1441da177e4SLinus Torvalds * --ANK (980726) 1451da177e4SLinus Torvalds */ 1461da177e4SLinus Torvalds 147a50feda5SEric Dumazet static bool is_ineligible(const struct sk_buff *skb) 1481da177e4SLinus Torvalds { 1490660e03fSArnaldo Carvalho de Melo int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; 1501da177e4SLinus Torvalds int len = skb->len - ptr; 1510660e03fSArnaldo Carvalho de Melo __u8 nexthdr = ipv6_hdr(skb)->nexthdr; 15275f2811cSJesse Gross __be16 frag_off; 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds if (len < 0) 155a50feda5SEric Dumazet return true; 1561da177e4SLinus Torvalds 15775f2811cSJesse Gross ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off); 1581da177e4SLinus Torvalds if (ptr < 0) 159a50feda5SEric Dumazet return false; 1601da177e4SLinus Torvalds if (nexthdr == IPPROTO_ICMPV6) { 1611da177e4SLinus Torvalds u8 _type, *tp; 1621da177e4SLinus Torvalds tp = skb_header_pointer(skb, 1631da177e4SLinus Torvalds ptr+offsetof(struct icmp6hdr, icmp6_type), 1641da177e4SLinus Torvalds sizeof(_type), &_type); 16563159f29SIan Morris if (!tp || !(*tp & ICMPV6_INFOMSG_MASK)) 166a50feda5SEric Dumazet return true; 1671da177e4SLinus Torvalds } 168a50feda5SEric Dumazet return false; 1691da177e4SLinus Torvalds } 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds /* 1721da177e4SLinus Torvalds * Check the ICMP output rate limit 1731da177e4SLinus Torvalds */ 1744cdf507dSEric Dumazet static bool icmpv6_xrlim_allow(struct sock *sk, u8 type, 1754c9483b2SDavid S. Miller struct flowi6 *fl6) 1761da177e4SLinus Torvalds { 1773b1e0a65SYOSHIFUJI Hideaki struct net *net = sock_net(sk); 1784cdf507dSEric Dumazet struct dst_entry *dst; 17992d86829SDavid S. Miller bool res = false; 1801da177e4SLinus Torvalds 1811da177e4SLinus Torvalds /* Informational messages are not limited. */ 1821da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 18392d86829SDavid S. Miller return true; 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds /* Do not limit pmtu discovery, it would break it. */ 1861da177e4SLinus Torvalds if (type == ICMPV6_PKT_TOOBIG) 18792d86829SDavid S. Miller return true; 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds /* 1901da177e4SLinus Torvalds * Look up the output route. 1911da177e4SLinus Torvalds * XXX: perhaps the expire for routing entries cloned by 1921da177e4SLinus Torvalds * this lookup should be more aggressive (not longer than timeout). 1931da177e4SLinus Torvalds */ 1944c9483b2SDavid S. Miller dst = ip6_route_output(net, sk, fl6); 1951da177e4SLinus Torvalds if (dst->error) { 1963bd653c8SDenis V. Lunev IP6_INC_STATS(net, ip6_dst_idev(dst), 197a11d206dSYOSHIFUJI Hideaki IPSTATS_MIB_OUTNOROUTES); 1981da177e4SLinus Torvalds } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { 19992d86829SDavid S. Miller res = true; 2001da177e4SLinus Torvalds } else { 2011da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 2029a43b709SBenjamin Thery int tmo = net->ipv6.sysctl.icmpv6_time; 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds /* Give more bandwidth to wider prefixes. */ 2051da177e4SLinus Torvalds if (rt->rt6i_dst.plen < 128) 2061da177e4SLinus Torvalds tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 2071da177e4SLinus Torvalds 2084cdf507dSEric Dumazet if (icmp_global_allow()) { 2094cdf507dSEric Dumazet struct inet_peer *peer; 2104cdf507dSEric Dumazet 2114cdf507dSEric Dumazet peer = inet_getpeer_v6(net->ipv6.peers, 212fd0273d7SMartin KaFai Lau &fl6->daddr, 1); 213fbfe95a4SDavid S. Miller res = inet_peer_xrlim_allow(peer, tmo); 2141d861aa4SDavid S. Miller if (peer) 2151d861aa4SDavid S. Miller inet_putpeer(peer); 2161da177e4SLinus Torvalds } 2174cdf507dSEric Dumazet } 2181da177e4SLinus Torvalds dst_release(dst); 2191da177e4SLinus Torvalds return res; 2201da177e4SLinus Torvalds } 2211da177e4SLinus Torvalds 2221da177e4SLinus Torvalds /* 2231da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2241da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2251da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2261da177e4SLinus Torvalds * highest-order two bits set to 10 2271da177e4SLinus Torvalds */ 2281da177e4SLinus Torvalds 229a50feda5SEric Dumazet static bool opt_unrec(struct sk_buff *skb, __u32 offset) 2301da177e4SLinus Torvalds { 2311da177e4SLinus Torvalds u8 _optval, *op; 2321da177e4SLinus Torvalds 233bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2341da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 23563159f29SIan Morris if (!op) 236a50feda5SEric Dumazet return true; 2371da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2381da177e4SLinus Torvalds } 2391da177e4SLinus Torvalds 2406d0bfe22SLorenzo Colitti int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 2416d0bfe22SLorenzo Colitti struct icmp6hdr *thdr, int len) 2421da177e4SLinus Torvalds { 2431da177e4SLinus Torvalds struct sk_buff *skb; 2441da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2451da177e4SLinus Torvalds int err = 0; 2461da177e4SLinus Torvalds 247e5d08d71SIan Morris skb = skb_peek(&sk->sk_write_queue); 24863159f29SIan Morris if (!skb) 2491da177e4SLinus Torvalds goto out; 2501da177e4SLinus Torvalds 251cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2521da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2531da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2541da177e4SLinus Torvalds 2551da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 25607f0757aSJoe Perches skb->csum = csum_partial(icmp6h, 2571da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2584c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2594c9483b2SDavid S. Miller &fl6->daddr, 2604c9483b2SDavid S. Miller len, fl6->flowi6_proto, 2611da177e4SLinus Torvalds skb->csum); 2621da177e4SLinus Torvalds } else { 263868c86bcSAl Viro __wsum tmp_csum = 0; 2641da177e4SLinus Torvalds 2651da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2661da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2671da177e4SLinus Torvalds } 2681da177e4SLinus Torvalds 26907f0757aSJoe Perches tmp_csum = csum_partial(icmp6h, 2701da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 2714c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2724c9483b2SDavid S. Miller &fl6->daddr, 2734c9483b2SDavid S. Miller len, fl6->flowi6_proto, 274868c86bcSAl Viro tmp_csum); 2751da177e4SLinus Torvalds } 2761da177e4SLinus Torvalds ip6_push_pending_frames(sk); 2771da177e4SLinus Torvalds out: 2781da177e4SLinus Torvalds return err; 2791da177e4SLinus Torvalds } 2801da177e4SLinus Torvalds 2811da177e4SLinus Torvalds struct icmpv6_msg { 2821da177e4SLinus Torvalds struct sk_buff *skb; 2831da177e4SLinus Torvalds int offset; 284763ecff1SYasuyuki Kozakai uint8_t type; 2851da177e4SLinus Torvalds }; 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 2881da177e4SLinus Torvalds { 2891da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 2901da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 2915f92a738SAl Viro __wsum csum = 0; 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 2941da177e4SLinus Torvalds to, len, csum); 2951da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 296763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 297763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 2981da177e4SLinus Torvalds return 0; 2991da177e4SLinus Torvalds } 3001da177e4SLinus Torvalds 30107a93626SAmerigo Wang #if IS_ENABLED(CONFIG_IPV6_MIP6) 30279383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 30379383236SMasahide NAKAMURA { 3040660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 30579383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 30679383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 30779383236SMasahide NAKAMURA struct in6_addr tmp; 30879383236SMasahide NAKAMURA int off; 30979383236SMasahide NAKAMURA 31079383236SMasahide NAKAMURA if (opt->dsthao) { 31179383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 31279383236SMasahide NAKAMURA if (likely(off >= 0)) { 313d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 314d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 3154e3fd7a0SAlexey Dobriyan tmp = iph->saddr; 3164e3fd7a0SAlexey Dobriyan iph->saddr = hao->addr; 3174e3fd7a0SAlexey Dobriyan hao->addr = tmp; 31879383236SMasahide NAKAMURA } 31979383236SMasahide NAKAMURA } 32079383236SMasahide NAKAMURA } 32179383236SMasahide NAKAMURA #else 32279383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 32379383236SMasahide NAKAMURA #endif 32479383236SMasahide NAKAMURA 325e8243534Sstephen hemminger static struct dst_entry *icmpv6_route_lookup(struct net *net, 326e8243534Sstephen hemminger struct sk_buff *skb, 327e8243534Sstephen hemminger struct sock *sk, 328e8243534Sstephen hemminger struct flowi6 *fl6) 329b42835dbSDavid S. Miller { 330b42835dbSDavid S. Miller struct dst_entry *dst, *dst2; 3314c9483b2SDavid S. Miller struct flowi6 fl2; 332b42835dbSDavid S. Miller int err; 333b42835dbSDavid S. Miller 334343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst, fl6); 335b42835dbSDavid S. Miller if (err) 336b42835dbSDavid S. Miller return ERR_PTR(err); 337b42835dbSDavid S. Miller 338b42835dbSDavid S. Miller /* 339b42835dbSDavid S. Miller * We won't send icmp if the destination is known 340b42835dbSDavid S. Miller * anycast. 341b42835dbSDavid S. Miller */ 3422647a9b0SMartin KaFai Lau if (ipv6_anycast_destination(dst, &fl6->daddr)) { 343ba7a46f1SJoe Perches net_dbg_ratelimited("icmp6_send: acast source\n"); 344b42835dbSDavid S. Miller dst_release(dst); 345b42835dbSDavid S. Miller return ERR_PTR(-EINVAL); 346b42835dbSDavid S. Miller } 347b42835dbSDavid S. Miller 348b42835dbSDavid S. Miller /* No need to clone since we're just using its address. */ 349b42835dbSDavid S. Miller dst2 = dst; 350b42835dbSDavid S. Miller 3514c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); 352452edd59SDavid S. Miller if (!IS_ERR(dst)) { 353b42835dbSDavid S. Miller if (dst != dst2) 354b42835dbSDavid S. Miller return dst; 355452edd59SDavid S. Miller } else { 356452edd59SDavid S. Miller if (PTR_ERR(dst) == -EPERM) 357b42835dbSDavid S. Miller dst = NULL; 358452edd59SDavid S. Miller else 359452edd59SDavid S. Miller return dst; 360b42835dbSDavid S. Miller } 361b42835dbSDavid S. Miller 3624c9483b2SDavid S. Miller err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); 363b42835dbSDavid S. Miller if (err) 364b42835dbSDavid S. Miller goto relookup_failed; 365b42835dbSDavid S. Miller 366343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst2, &fl2); 367b42835dbSDavid S. Miller if (err) 368b42835dbSDavid S. Miller goto relookup_failed; 369b42835dbSDavid S. Miller 3704c9483b2SDavid S. Miller dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); 371452edd59SDavid S. Miller if (!IS_ERR(dst2)) { 372b42835dbSDavid S. Miller dst_release(dst); 373b42835dbSDavid S. Miller dst = dst2; 374452edd59SDavid S. Miller } else { 375452edd59SDavid S. Miller err = PTR_ERR(dst2); 376452edd59SDavid S. Miller if (err == -EPERM) { 377b42835dbSDavid S. Miller dst_release(dst); 378452edd59SDavid S. Miller return dst2; 379452edd59SDavid S. Miller } else 380b42835dbSDavid S. Miller goto relookup_failed; 381b42835dbSDavid S. Miller } 382b42835dbSDavid S. Miller 383b42835dbSDavid S. Miller relookup_failed: 384b42835dbSDavid S. Miller if (dst) 385b42835dbSDavid S. Miller return dst; 386b42835dbSDavid S. Miller return ERR_PTR(err); 387b42835dbSDavid S. Miller } 388b42835dbSDavid S. Miller 3891da177e4SLinus Torvalds /* 3901da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 3911da177e4SLinus Torvalds */ 392b1cadc1aSEric Dumazet static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info, 393b1cadc1aSEric Dumazet const struct in6_addr *force_saddr) 3941da177e4SLinus Torvalds { 395c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 3961da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 3970660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 39884427d53SYOSHIFUJI Hideaki struct sock *sk; 39984427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 400b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 4011da177e4SLinus Torvalds struct dst_entry *dst; 4021da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 4034c9483b2SDavid S. Miller struct flowi6 fl6; 4041da177e4SLinus Torvalds struct icmpv6_msg msg; 405c14ac945SSoheil Hassas Yeganeh struct sockcm_cookie sockc_unused = {0}; 40626879da5SWei Wang struct ipcm6_cookie ipc6; 4071da177e4SLinus Torvalds int iif = 0; 4081da177e4SLinus Torvalds int addr_type = 0; 4091da177e4SLinus Torvalds int len; 4101da177e4SLinus Torvalds int err = 0; 411e110861fSLorenzo Colitti u32 mark = IP6_REPLY_MARK(net, skb->mark); 4121da177e4SLinus Torvalds 41327a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 41429a3cad5SSimon Horman (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb)) 4151da177e4SLinus Torvalds return; 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds /* 4181da177e4SLinus Torvalds * Make sure we respect the rules 4191da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 4205f5624cfSPravin B Shelar * Rule (e.1) is enforced by not using icmp6_send 4211da177e4SLinus Torvalds * in any code that processes icmp errors. 4221da177e4SLinus Torvalds */ 4231da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 4241da177e4SLinus Torvalds 425446fab59SFX Le Bail if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) || 426d94c1f92SFX Le Bail ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr)) 4271da177e4SLinus Torvalds saddr = &hdr->daddr; 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds /* 4301da177e4SLinus Torvalds * Dest addr check 4311da177e4SLinus Torvalds */ 4321da177e4SLinus Torvalds 4339a6b4b39Szhuyj if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) { 4341da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 4351da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 4361da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 4371da177e4SLinus Torvalds (opt_unrec(skb, info)))) 4381da177e4SLinus Torvalds return; 4391da177e4SLinus Torvalds 4401da177e4SLinus Torvalds saddr = NULL; 4411da177e4SLinus Torvalds } 4421da177e4SLinus Torvalds 4431da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 4441da177e4SLinus Torvalds 4451da177e4SLinus Torvalds /* 4461da177e4SLinus Torvalds * Source addr check 4471da177e4SLinus Torvalds */ 4481da177e4SLinus Torvalds 449842df073SHannes Frederic Sowa if (__ipv6_addr_needs_scope_id(addr_type)) 4501da177e4SLinus Torvalds iif = skb->dev->ifindex; 45179dc7e3fSDavid Ahern else { 45279dc7e3fSDavid Ahern dst = skb_dst(skb); 45379dc7e3fSDavid Ahern iif = l3mdev_master_ifindex(dst ? dst->dev : skb->dev); 45479dc7e3fSDavid Ahern } 4551da177e4SLinus Torvalds 4561da177e4SLinus Torvalds /* 4578de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 4588de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 4598de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 4608de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 4611da177e4SLinus Torvalds */ 4621da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 4634b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n", 4644b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 4651da177e4SLinus Torvalds return; 4661da177e4SLinus Torvalds } 4671da177e4SLinus Torvalds 4681da177e4SLinus Torvalds /* 4691da177e4SLinus Torvalds * Never answer to a ICMP packet. 4701da177e4SLinus Torvalds */ 4711da177e4SLinus Torvalds if (is_ineligible(skb)) { 4724b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n", 4734b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 4741da177e4SLinus Torvalds return; 4751da177e4SLinus Torvalds } 4761da177e4SLinus Torvalds 47779383236SMasahide NAKAMURA mip6_addr_swap(skb); 47879383236SMasahide NAKAMURA 4794c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 4804c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 4814e3fd7a0SAlexey Dobriyan fl6.daddr = hdr->saddr; 482b1cadc1aSEric Dumazet if (force_saddr) 483b1cadc1aSEric Dumazet saddr = force_saddr; 4841da177e4SLinus Torvalds if (saddr) 4854e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 486e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 4874c9483b2SDavid S. Miller fl6.flowi6_oif = iif; 4881958b856SDavid S. Miller fl6.fl6_icmp_type = type; 4891958b856SDavid S. Miller fl6.fl6_icmp_code = code; 490e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 4914c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 4921da177e4SLinus Torvalds 493fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 49463159f29SIan Morris if (!sk) 495405666dbSDenis V. Lunev return; 496e110861fSLorenzo Colitti sk->sk_mark = mark; 497fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 498405666dbSDenis V. Lunev 4994c9483b2SDavid S. Miller if (!icmpv6_xrlim_allow(sk, type, &fl6)) 5001da177e4SLinus Torvalds goto out; 5011da177e4SLinus Torvalds 5021da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 5031da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 5041da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 5051da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 5061da177e4SLinus Torvalds 5074c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 5084c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 509c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 510c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 5111da177e4SLinus Torvalds 51238b7097bSHannes Frederic Sowa ipc6.tclass = np->tclass; 51338b7097bSHannes Frederic Sowa fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 51438b7097bSHannes Frederic Sowa 5154c9483b2SDavid S. Miller dst = icmpv6_route_lookup(net, skb, sk, &fl6); 516b42835dbSDavid S. Miller if (IS_ERR(dst)) 5171da177e4SLinus Torvalds goto out; 5188de3351eSYOSHIFUJI Hideaki 51926879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 52026879da5SWei Wang ipc6.dontfrag = np->dontfrag; 52126879da5SWei Wang ipc6.opt = NULL; 5221da177e4SLinus Torvalds 5231da177e4SLinus Torvalds msg.skb = skb; 524bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 525763ecff1SYasuyuki Kozakai msg.type = type; 5261da177e4SLinus Torvalds 5271da177e4SLinus Torvalds len = skb->len - msg.offset; 5281da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); 5291da177e4SLinus Torvalds if (len < 0) { 5304b3418fbSBjørn Mork net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n", 5314b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5321da177e4SLinus Torvalds goto out_dst_release; 5331da177e4SLinus Torvalds } 5341da177e4SLinus Torvalds 535cfdf7647SEric Dumazet rcu_read_lock(); 536cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 5371da177e4SLinus Torvalds 5381da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, 5391da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 54026879da5SWei Wang sizeof(struct icmp6hdr), 54126879da5SWei Wang &ipc6, &fl6, (struct rt6_info *)dst, 54226879da5SWei Wang MSG_DONTWAIT, &sockc_unused); 5431da177e4SLinus Torvalds if (err) { 54443a43b60SHannes Frederic Sowa ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 5451da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 546cfdf7647SEric Dumazet } else { 547cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 548cfdf7647SEric Dumazet len + sizeof(struct icmp6hdr)); 5491da177e4SLinus Torvalds } 550cfdf7647SEric Dumazet rcu_read_unlock(); 5511da177e4SLinus Torvalds out_dst_release: 5521da177e4SLinus Torvalds dst_release(dst); 5531da177e4SLinus Torvalds out: 554405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5551da177e4SLinus Torvalds } 5565f5624cfSPravin B Shelar 5575f5624cfSPravin B Shelar /* Slightly more convenient version of icmp6_send. 5585f5624cfSPravin B Shelar */ 5595f5624cfSPravin B Shelar void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) 5605f5624cfSPravin B Shelar { 561b1cadc1aSEric Dumazet icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL); 5625f5624cfSPravin B Shelar kfree_skb(skb); 5635f5624cfSPravin B Shelar } 5647159039aSYOSHIFUJI Hideaki 5655fbba8acSEric Dumazet /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH 5665fbba8acSEric Dumazet * if sufficient data bytes are available 5675fbba8acSEric Dumazet * @nhs is the size of the tunnel header(s) : 5685fbba8acSEric Dumazet * Either an IPv4 header for SIT encap 5695fbba8acSEric Dumazet * an IPv4 header + GRE header for GRE encap 5705fbba8acSEric Dumazet */ 57120e1954fSEric Dumazet int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type, 57220e1954fSEric Dumazet unsigned int data_len) 5735fbba8acSEric Dumazet { 5742d7a3b27SEric Dumazet struct in6_addr temp_saddr; 5755fbba8acSEric Dumazet struct rt6_info *rt; 5765fbba8acSEric Dumazet struct sk_buff *skb2; 57720e1954fSEric Dumazet u32 info = 0; 5785fbba8acSEric Dumazet 5795fbba8acSEric Dumazet if (!pskb_may_pull(skb, nhs + sizeof(struct ipv6hdr) + 8)) 5805fbba8acSEric Dumazet return 1; 5815fbba8acSEric Dumazet 58220e1954fSEric Dumazet /* RFC 4884 (partial) support for ICMP extensions */ 58320e1954fSEric Dumazet if (data_len < 128 || (data_len & 7) || skb->len < data_len) 58420e1954fSEric Dumazet data_len = 0; 58520e1954fSEric Dumazet 58620e1954fSEric Dumazet skb2 = data_len ? skb_copy(skb, GFP_ATOMIC) : skb_clone(skb, GFP_ATOMIC); 5875fbba8acSEric Dumazet 5885fbba8acSEric Dumazet if (!skb2) 5895fbba8acSEric Dumazet return 1; 5905fbba8acSEric Dumazet 5915fbba8acSEric Dumazet skb_dst_drop(skb2); 5925fbba8acSEric Dumazet skb_pull(skb2, nhs); 5935fbba8acSEric Dumazet skb_reset_network_header(skb2); 5945fbba8acSEric Dumazet 5955fbba8acSEric Dumazet rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 0); 5965fbba8acSEric Dumazet 5975fbba8acSEric Dumazet if (rt && rt->dst.dev) 5985fbba8acSEric Dumazet skb2->dev = rt->dst.dev; 5995fbba8acSEric Dumazet 6002d7a3b27SEric Dumazet ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr); 60120e1954fSEric Dumazet 60220e1954fSEric Dumazet if (data_len) { 60320e1954fSEric Dumazet /* RFC 4884 (partial) support : 60420e1954fSEric Dumazet * insert 0 padding at the end, before the extensions 60520e1954fSEric Dumazet */ 60620e1954fSEric Dumazet __skb_push(skb2, nhs); 60720e1954fSEric Dumazet skb_reset_network_header(skb2); 60820e1954fSEric Dumazet memmove(skb2->data, skb2->data + nhs, data_len - nhs); 60920e1954fSEric Dumazet memset(skb2->data + data_len - nhs, 0, nhs); 61020e1954fSEric Dumazet /* RFC 4884 4.5 : Length is measured in 64-bit words, 61120e1954fSEric Dumazet * and stored in reserved[0] 61220e1954fSEric Dumazet */ 61320e1954fSEric Dumazet info = (data_len/8) << 24; 61420e1954fSEric Dumazet } 6152d7a3b27SEric Dumazet if (type == ICMP_TIME_EXCEEDED) 6162d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 61720e1954fSEric Dumazet info, &temp_saddr); 6182d7a3b27SEric Dumazet else 6192d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 62020e1954fSEric Dumazet info, &temp_saddr); 6215fbba8acSEric Dumazet if (rt) 6225fbba8acSEric Dumazet ip6_rt_put(rt); 6235fbba8acSEric Dumazet 6245fbba8acSEric Dumazet kfree_skb(skb2); 6255fbba8acSEric Dumazet 6265fbba8acSEric Dumazet return 0; 6275fbba8acSEric Dumazet } 6285fbba8acSEric Dumazet EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach); 6295fbba8acSEric Dumazet 6301da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 6311da177e4SLinus Torvalds { 632c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 63384427d53SYOSHIFUJI Hideaki struct sock *sk; 6341da177e4SLinus Torvalds struct inet6_dev *idev; 63584427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 636b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 637cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 6381da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 6394c9483b2SDavid S. Miller struct flowi6 fl6; 6401da177e4SLinus Torvalds struct icmpv6_msg msg; 6411da177e4SLinus Torvalds struct dst_entry *dst; 64226879da5SWei Wang struct ipcm6_cookie ipc6; 6431da177e4SLinus Torvalds int err = 0; 644e110861fSLorenzo Colitti u32 mark = IP6_REPLY_MARK(net, skb->mark); 645c14ac945SSoheil Hassas Yeganeh struct sockcm_cookie sockc_unused = {0}; 6461da177e4SLinus Torvalds 6470660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 6481da177e4SLinus Torvalds 649509aba3bSFX Le Bail if (!ipv6_unicast_destination(skb) && 650ec35b61eSFX Le Bail !(net->ipv6.sysctl.anycast_src_echo_reply && 6512647a9b0SMartin KaFai Lau ipv6_anycast_destination(skb_dst(skb), saddr))) 6521da177e4SLinus Torvalds saddr = NULL; 6531da177e4SLinus Torvalds 6541da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 6551da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 6561da177e4SLinus Torvalds 6574c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 6584c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 6594e3fd7a0SAlexey Dobriyan fl6.daddr = ipv6_hdr(skb)->saddr; 6601da177e4SLinus Torvalds if (saddr) 6614e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 6629ff74384SDavid Ahern fl6.flowi6_oif = skb->dev->ifindex; 6631958b856SDavid S. Miller fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; 664e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 665e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 6664c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 6671da177e4SLinus Torvalds 668fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 66963159f29SIan Morris if (!sk) 670405666dbSDenis V. Lunev return; 671e110861fSLorenzo Colitti sk->sk_mark = mark; 672fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 673405666dbSDenis V. Lunev 6744c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 6754c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 676c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 677c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 6781da177e4SLinus Torvalds 679343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst, &fl6); 6801da177e4SLinus Torvalds if (err) 6811da177e4SLinus Torvalds goto out; 6824c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); 683452edd59SDavid S. Miller if (IS_ERR(dst)) 684e104411bSPatrick McHardy goto out; 6851da177e4SLinus Torvalds 686cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 6871da177e4SLinus Torvalds 6881da177e4SLinus Torvalds msg.skb = skb; 6891da177e4SLinus Torvalds msg.offset = 0; 690763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 6911da177e4SLinus Torvalds 69226879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 69326879da5SWei Wang ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 69426879da5SWei Wang ipc6.dontfrag = np->dontfrag; 69526879da5SWei Wang ipc6.opt = NULL; 69626879da5SWei Wang 6971da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 69826879da5SWei Wang sizeof(struct icmp6hdr), &ipc6, &fl6, 69913b52cd4SBrian Haley (struct rt6_info *)dst, MSG_DONTWAIT, 70026879da5SWei Wang &sockc_unused); 7011da177e4SLinus Torvalds 7021da177e4SLinus Torvalds if (err) { 703a16292a0SEric Dumazet __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 7041da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 705cfdf7647SEric Dumazet } else { 706cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 707cfdf7647SEric Dumazet skb->len + sizeof(struct icmp6hdr)); 7081da177e4SLinus Torvalds } 7091da177e4SLinus Torvalds dst_release(dst); 7101da177e4SLinus Torvalds out: 711405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 7121da177e4SLinus Torvalds } 7131da177e4SLinus Torvalds 714b94f1c09SDavid S. Miller void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 7151da177e4SLinus Torvalds { 71641135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 7171da177e4SLinus Torvalds int inner_offset; 71875f2811cSJesse Gross __be16 frag_off; 719f9242b6bSDavid S. Miller u8 nexthdr; 7207304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 7237304fe46SDuan Jiong goto out; 7241da177e4SLinus Torvalds 7251da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 7261da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 7271da177e4SLinus Torvalds /* now skip over extension headers */ 72875f2811cSJesse Gross inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 72975f2811cSJesse Gross &nexthdr, &frag_off); 7301da177e4SLinus Torvalds if (inner_offset < 0) 7317304fe46SDuan Jiong goto out; 7321da177e4SLinus Torvalds } else { 7331da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 7341da177e4SLinus Torvalds } 7351da177e4SLinus Torvalds 7361da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 7371da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 7387304fe46SDuan Jiong goto out; 7391da177e4SLinus Torvalds 7401da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 7411da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 7421da177e4SLinus Torvalds pmtu discovery. 7431da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 7441da177e4SLinus Torvalds --ANK (980726) 7451da177e4SLinus Torvalds */ 7461da177e4SLinus Torvalds 747f9242b6bSDavid S. Miller ipprot = rcu_dereference(inet6_protos[nexthdr]); 7481da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 7491da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 7501da177e4SLinus Torvalds 75169d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 7527304fe46SDuan Jiong return; 7537304fe46SDuan Jiong 7547304fe46SDuan Jiong out: 755a16292a0SEric Dumazet __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); 7561da177e4SLinus Torvalds } 7571da177e4SLinus Torvalds 7581da177e4SLinus Torvalds /* 7591da177e4SLinus Torvalds * Handle icmp messages 7601da177e4SLinus Torvalds */ 7611da177e4SLinus Torvalds 762e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 7631da177e4SLinus Torvalds { 7641da177e4SLinus Torvalds struct net_device *dev = skb->dev; 7651da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 766b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 7671da177e4SLinus Torvalds struct icmp6hdr *hdr; 768d5fdd6baSBrian Haley u8 type; 769e3e32170SRick Jones bool success = false; 7701da177e4SLinus Torvalds 771aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 772def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 7738b7817f3SHerbert Xu int nh; 7748b7817f3SHerbert Xu 775def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 776aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 777aebcf82cSHerbert Xu goto drop_no_count; 778aebcf82cSHerbert Xu 77981aded24SDavid S. Miller if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) 7808b7817f3SHerbert Xu goto drop_no_count; 7818b7817f3SHerbert Xu 7828b7817f3SHerbert Xu nh = skb_network_offset(skb); 7838b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 7848b7817f3SHerbert Xu 7858b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 7868b7817f3SHerbert Xu goto drop_no_count; 7878b7817f3SHerbert Xu 7888b7817f3SHerbert Xu skb_set_network_header(skb, nh); 7898b7817f3SHerbert Xu } 7908b7817f3SHerbert Xu 791a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS); 7921da177e4SLinus Torvalds 7930660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 7940660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 7951da177e4SLinus Torvalds 79639471ac8STom Herbert if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { 797ba7a46f1SJoe Perches net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", 7980c6ce78aSHarvey Harrison saddr, daddr); 7996a5dc9e5SEric Dumazet goto csum_error; 8001da177e4SLinus Torvalds } 8011da177e4SLinus Torvalds 8028cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 8038cf22943SHerbert Xu goto discard_it; 8041da177e4SLinus Torvalds 805cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 8061da177e4SLinus Torvalds 8071da177e4SLinus Torvalds type = hdr->icmp6_type; 8081da177e4SLinus Torvalds 809f3832ed2SEric Dumazet ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type); 8101da177e4SLinus Torvalds 8111da177e4SLinus Torvalds switch (type) { 8121da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 8131da177e4SLinus Torvalds icmpv6_echo_reply(skb); 8141da177e4SLinus Torvalds break; 8151da177e4SLinus Torvalds 8161da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 817e3e32170SRick Jones success = ping_rcv(skb); 8181da177e4SLinus Torvalds break; 8191da177e4SLinus Torvalds 8201da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 8211da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 8221da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 8231da177e4SLinus Torvalds destination cache will allow to solve this problem 8241da177e4SLinus Torvalds --ANK (980726) 8251da177e4SLinus Torvalds */ 8261da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 8271da177e4SLinus Torvalds goto discard_it; 828cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 8291da177e4SLinus Torvalds 8301da177e4SLinus Torvalds /* 8311da177e4SLinus Torvalds * Drop through to notify 8321da177e4SLinus Torvalds */ 8331da177e4SLinus Torvalds 8341da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 8351da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 8361da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 8371da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 8381da177e4SLinus Torvalds break; 8391da177e4SLinus Torvalds 8401da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 8411da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 8421da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 8431da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 8441da177e4SLinus Torvalds case NDISC_REDIRECT: 8451da177e4SLinus Torvalds ndisc_rcv(skb); 8461da177e4SLinus Torvalds break; 8471da177e4SLinus Torvalds 8481da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 8491da177e4SLinus Torvalds igmp6_event_query(skb); 8501da177e4SLinus Torvalds break; 8511da177e4SLinus Torvalds 8521da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 8531da177e4SLinus Torvalds igmp6_event_report(skb); 8541da177e4SLinus Torvalds break; 8551da177e4SLinus Torvalds 8561da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 8571da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 8581da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 8591da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 8601da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 8611da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 8621da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 8631da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 8641da177e4SLinus Torvalds break; 8651da177e4SLinus Torvalds 8661da177e4SLinus Torvalds default: 8671da177e4SLinus Torvalds /* informational */ 8681da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 8691da177e4SLinus Torvalds break; 8701da177e4SLinus Torvalds 8714b3418fbSBjørn Mork net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n", 8724b3418fbSBjørn Mork saddr, daddr); 873ea85a0a2SDavid S. Miller 8741da177e4SLinus Torvalds /* 8751da177e4SLinus Torvalds * error of unknown type. 8761da177e4SLinus Torvalds * must pass to upper level 8771da177e4SLinus Torvalds */ 8781da177e4SLinus Torvalds 8791da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 8803ff50b79SStephen Hemminger } 8813ff50b79SStephen Hemminger 882e3e32170SRick Jones /* until the v6 path can be better sorted assume failure and 883e3e32170SRick Jones * preserve the status quo behaviour for the rest of the paths to here 884e3e32170SRick Jones */ 885e3e32170SRick Jones if (success) 886e3e32170SRick Jones consume_skb(skb); 887e3e32170SRick Jones else 8881da177e4SLinus Torvalds kfree_skb(skb); 889e3e32170SRick Jones 8901da177e4SLinus Torvalds return 0; 8911da177e4SLinus Torvalds 8926a5dc9e5SEric Dumazet csum_error: 893a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); 8941da177e4SLinus Torvalds discard_it: 895a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS); 8968b7817f3SHerbert Xu drop_no_count: 8971da177e4SLinus Torvalds kfree_skb(skb); 8981da177e4SLinus Torvalds return 0; 8991da177e4SLinus Torvalds } 9001da177e4SLinus Torvalds 9014c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, 90295e41e93SYOSHIFUJI Hideaki u8 type, 90395e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 90495e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 90595e41e93SYOSHIFUJI Hideaki int oif) 90695e41e93SYOSHIFUJI Hideaki { 9074c9483b2SDavid S. Miller memset(fl6, 0, sizeof(*fl6)); 9084e3fd7a0SAlexey Dobriyan fl6->saddr = *saddr; 9094e3fd7a0SAlexey Dobriyan fl6->daddr = *daddr; 9104c9483b2SDavid S. Miller fl6->flowi6_proto = IPPROTO_ICMPV6; 9111958b856SDavid S. Miller fl6->fl6_icmp_type = type; 9121958b856SDavid S. Miller fl6->fl6_icmp_code = 0; 9134c9483b2SDavid S. Miller fl6->flowi6_oif = oif; 9144c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); 91595e41e93SYOSHIFUJI Hideaki } 91695e41e93SYOSHIFUJI Hideaki 91798c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 9181da177e4SLinus Torvalds { 9191da177e4SLinus Torvalds struct sock *sk; 9201da177e4SLinus Torvalds int err, i, j; 9211da177e4SLinus Torvalds 92298c6d1b2SDenis V. Lunev net->ipv6.icmp_sk = 92398c6d1b2SDenis V. Lunev kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); 92463159f29SIan Morris if (!net->ipv6.icmp_sk) 92579c91159SDenis V. Lunev return -ENOMEM; 92679c91159SDenis V. Lunev 9276f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 9281ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 9291ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 9301da177e4SLinus Torvalds if (err < 0) { 931f3213831SJoe Perches pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", 9321da177e4SLinus Torvalds err); 9331da177e4SLinus Torvalds goto fail; 9341da177e4SLinus Torvalds } 9351da177e4SLinus Torvalds 9361ed8516fSDenis V. Lunev net->ipv6.icmp_sk[i] = sk; 9375c8cafd6SDenis V. Lunev 9381da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 9391da177e4SLinus Torvalds * sk_buff struct overhead. 9401da177e4SLinus Torvalds */ 94187fb4b7bSEric Dumazet sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); 9421da177e4SLinus Torvalds } 9431da177e4SLinus Torvalds return 0; 9441da177e4SLinus Torvalds 9451da177e4SLinus Torvalds fail: 9465c8cafd6SDenis V. Lunev for (j = 0; j < i; j++) 9471ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); 94898c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 9491da177e4SLinus Torvalds return err; 9501da177e4SLinus Torvalds } 9511da177e4SLinus Torvalds 95298c6d1b2SDenis V. Lunev static void __net_exit icmpv6_sk_exit(struct net *net) 9531da177e4SLinus Torvalds { 9541da177e4SLinus Torvalds int i; 9551da177e4SLinus Torvalds 9566f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 9571ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); 9581da177e4SLinus Torvalds } 95998c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 96098c6d1b2SDenis V. Lunev } 96198c6d1b2SDenis V. Lunev 9628ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 96398c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 96498c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 96598c6d1b2SDenis V. Lunev }; 96698c6d1b2SDenis V. Lunev 96798c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 96898c6d1b2SDenis V. Lunev { 96998c6d1b2SDenis V. Lunev int err; 97098c6d1b2SDenis V. Lunev 97198c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 97298c6d1b2SDenis V. Lunev if (err < 0) 97398c6d1b2SDenis V. Lunev return err; 97498c6d1b2SDenis V. Lunev 97598c6d1b2SDenis V. Lunev err = -EAGAIN; 97698c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 97798c6d1b2SDenis V. Lunev goto fail; 9785f5624cfSPravin B Shelar 9795f5624cfSPravin B Shelar err = inet6_register_icmp_sender(icmp6_send); 9805f5624cfSPravin B Shelar if (err) 9815f5624cfSPravin B Shelar goto sender_reg_err; 98298c6d1b2SDenis V. Lunev return 0; 98398c6d1b2SDenis V. Lunev 9845f5624cfSPravin B Shelar sender_reg_err: 9855f5624cfSPravin B Shelar inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 98698c6d1b2SDenis V. Lunev fail: 987f3213831SJoe Perches pr_err("Failed to register ICMP6 protocol\n"); 98898c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 98998c6d1b2SDenis V. Lunev return err; 99098c6d1b2SDenis V. Lunev } 99198c6d1b2SDenis V. Lunev 9928ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 99398c6d1b2SDenis V. Lunev { 9945f5624cfSPravin B Shelar inet6_unregister_icmp_sender(icmp6_send); 99598c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 9961da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 9971da177e4SLinus Torvalds } 9981da177e4SLinus Torvalds 99998c6d1b2SDenis V. Lunev 10009b5b5cffSArjan van de Ven static const struct icmp6_err { 10011da177e4SLinus Torvalds int err; 10021da177e4SLinus Torvalds int fatal; 10031da177e4SLinus Torvalds } tab_unreach[] = { 10041da177e4SLinus Torvalds { /* NOROUTE */ 10051da177e4SLinus Torvalds .err = ENETUNREACH, 10061da177e4SLinus Torvalds .fatal = 0, 10071da177e4SLinus Torvalds }, 10081da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 10091da177e4SLinus Torvalds .err = EACCES, 10101da177e4SLinus Torvalds .fatal = 1, 10111da177e4SLinus Torvalds }, 10121da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 10131da177e4SLinus Torvalds .err = EHOSTUNREACH, 10141da177e4SLinus Torvalds .fatal = 0, 10151da177e4SLinus Torvalds }, 10161da177e4SLinus Torvalds { /* ADDR_UNREACH */ 10171da177e4SLinus Torvalds .err = EHOSTUNREACH, 10181da177e4SLinus Torvalds .fatal = 0, 10191da177e4SLinus Torvalds }, 10201da177e4SLinus Torvalds { /* PORT_UNREACH */ 10211da177e4SLinus Torvalds .err = ECONNREFUSED, 10221da177e4SLinus Torvalds .fatal = 1, 10231da177e4SLinus Torvalds }, 102461e76b17SJiri Bohac { /* POLICY_FAIL */ 102561e76b17SJiri Bohac .err = EACCES, 102661e76b17SJiri Bohac .fatal = 1, 102761e76b17SJiri Bohac }, 102861e76b17SJiri Bohac { /* REJECT_ROUTE */ 102961e76b17SJiri Bohac .err = EACCES, 103061e76b17SJiri Bohac .fatal = 1, 103161e76b17SJiri Bohac }, 10321da177e4SLinus Torvalds }; 10331da177e4SLinus Torvalds 1034d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 10351da177e4SLinus Torvalds { 10361da177e4SLinus Torvalds int fatal = 0; 10371da177e4SLinus Torvalds 10381da177e4SLinus Torvalds *err = EPROTO; 10391da177e4SLinus Torvalds 10401da177e4SLinus Torvalds switch (type) { 10411da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 10421da177e4SLinus Torvalds fatal = 1; 104361e76b17SJiri Bohac if (code < ARRAY_SIZE(tab_unreach)) { 10441da177e4SLinus Torvalds *err = tab_unreach[code].err; 10451da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 10461da177e4SLinus Torvalds } 10471da177e4SLinus Torvalds break; 10481da177e4SLinus Torvalds 10491da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 10501da177e4SLinus Torvalds *err = EMSGSIZE; 10511da177e4SLinus Torvalds break; 10521da177e4SLinus Torvalds 10531da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 10541da177e4SLinus Torvalds *err = EPROTO; 10551da177e4SLinus Torvalds fatal = 1; 10561da177e4SLinus Torvalds break; 10571da177e4SLinus Torvalds 10581da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 10591da177e4SLinus Torvalds *err = EHOSTUNREACH; 10601da177e4SLinus Torvalds break; 10613ff50b79SStephen Hemminger } 10621da177e4SLinus Torvalds 10631da177e4SLinus Torvalds return fatal; 10641da177e4SLinus Torvalds } 10657159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 10667159039aSYOSHIFUJI Hideaki 10671da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 1068e8243534Sstephen hemminger static struct ctl_table ipv6_icmp_table_template[] = { 10691da177e4SLinus Torvalds { 10701da177e4SLinus Torvalds .procname = "ratelimit", 107141a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 10721da177e4SLinus Torvalds .maxlen = sizeof(int), 10731da177e4SLinus Torvalds .mode = 0644, 10746d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 10751da177e4SLinus Torvalds }, 1076f8572d8fSEric W. Biederman { }, 10771da177e4SLinus Torvalds }; 1078760f2d01SDaniel Lezcano 10792c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 1080760f2d01SDaniel Lezcano { 1081760f2d01SDaniel Lezcano struct ctl_table *table; 1082760f2d01SDaniel Lezcano 1083760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 1084760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 1085760f2d01SDaniel Lezcano GFP_KERNEL); 10865ee09105SYOSHIFUJI Hideaki 1087c027aab4SEric W. Biederman if (table) 10885ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 10895ee09105SYOSHIFUJI Hideaki 1090760f2d01SDaniel Lezcano return table; 1091760f2d01SDaniel Lezcano } 10921da177e4SLinus Torvalds #endif 1093