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 731da177e4SLinus Torvalds #include <asm/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) 956f809da2SSteffen Klassert ip6_update_pmtu(skb, net, info, 0, 0); 966f809da2SSteffen Klassert else if (type == NDISC_REDIRECT) 97b55b76b2SDuan Jiong ip6_redirect(skb, net, skb->dev->ifindex, 0); 986d0bfe22SLorenzo Colitti 996d0bfe22SLorenzo Colitti if (!(type & ICMPV6_INFOMSG_MASK)) 1006d0bfe22SLorenzo Colitti if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST) 101dcb94b88SHannes Frederic Sowa ping_err(skb, offset, ntohl(info)); 1026f809da2SSteffen Klassert } 1036f809da2SSteffen Klassert 104e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb); 1051da177e4SLinus Torvalds 10641135cc8SAlexey Dobriyan static const struct inet6_protocol icmpv6_protocol = { 1071da177e4SLinus Torvalds .handler = icmpv6_rcv, 1086f809da2SSteffen Klassert .err_handler = icmpv6_err, 1098b7817f3SHerbert Xu .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1101da177e4SLinus Torvalds }; 1111da177e4SLinus Torvalds 112fdc0bde9SDenis V. Lunev static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) 1131da177e4SLinus Torvalds { 114fdc0bde9SDenis V. Lunev struct sock *sk; 115fdc0bde9SDenis V. Lunev 1161da177e4SLinus Torvalds local_bh_disable(); 1171da177e4SLinus Torvalds 118fdc0bde9SDenis V. Lunev sk = icmpv6_sk(net); 119405666dbSDenis V. Lunev if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { 1201da177e4SLinus Torvalds /* This can happen if the output path (f.e. SIT or 1211da177e4SLinus Torvalds * ip6ip6 tunnel) signals dst_link_failure() for an 1221da177e4SLinus Torvalds * outgoing ICMP6 packet. 1231da177e4SLinus Torvalds */ 1241da177e4SLinus Torvalds local_bh_enable(); 125fdc0bde9SDenis V. Lunev return NULL; 1261da177e4SLinus Torvalds } 127fdc0bde9SDenis V. Lunev return sk; 1281da177e4SLinus Torvalds } 1291da177e4SLinus Torvalds 130405666dbSDenis V. Lunev static __inline__ void icmpv6_xmit_unlock(struct sock *sk) 1311da177e4SLinus Torvalds { 132405666dbSDenis V. Lunev spin_unlock_bh(&sk->sk_lock.slock); 1331da177e4SLinus Torvalds } 1341da177e4SLinus Torvalds 1351da177e4SLinus Torvalds /* 1361da177e4SLinus Torvalds * Figure out, may we reply to this packet with icmp error. 1371da177e4SLinus Torvalds * 1381da177e4SLinus Torvalds * We do not reply, if: 1391da177e4SLinus Torvalds * - it was icmp error message. 1401da177e4SLinus Torvalds * - it is truncated, so that it is known, that protocol is ICMPV6 1411da177e4SLinus Torvalds * (i.e. in the middle of some exthdr) 1421da177e4SLinus Torvalds * 1431da177e4SLinus Torvalds * --ANK (980726) 1441da177e4SLinus Torvalds */ 1451da177e4SLinus Torvalds 146a50feda5SEric Dumazet static bool is_ineligible(const struct sk_buff *skb) 1471da177e4SLinus Torvalds { 1480660e03fSArnaldo Carvalho de Melo int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; 1491da177e4SLinus Torvalds int len = skb->len - ptr; 1500660e03fSArnaldo Carvalho de Melo __u8 nexthdr = ipv6_hdr(skb)->nexthdr; 15175f2811cSJesse Gross __be16 frag_off; 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds if (len < 0) 154a50feda5SEric Dumazet return true; 1551da177e4SLinus Torvalds 15675f2811cSJesse Gross ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off); 1571da177e4SLinus Torvalds if (ptr < 0) 158a50feda5SEric Dumazet return false; 1591da177e4SLinus Torvalds if (nexthdr == IPPROTO_ICMPV6) { 1601da177e4SLinus Torvalds u8 _type, *tp; 1611da177e4SLinus Torvalds tp = skb_header_pointer(skb, 1621da177e4SLinus Torvalds ptr+offsetof(struct icmp6hdr, icmp6_type), 1631da177e4SLinus Torvalds sizeof(_type), &_type); 16463159f29SIan Morris if (!tp || !(*tp & ICMPV6_INFOMSG_MASK)) 165a50feda5SEric Dumazet return true; 1661da177e4SLinus Torvalds } 167a50feda5SEric Dumazet return false; 1681da177e4SLinus Torvalds } 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds /* 1711da177e4SLinus Torvalds * Check the ICMP output rate limit 1721da177e4SLinus Torvalds */ 1734cdf507dSEric Dumazet static bool icmpv6_xrlim_allow(struct sock *sk, u8 type, 1744c9483b2SDavid S. Miller struct flowi6 *fl6) 1751da177e4SLinus Torvalds { 1763b1e0a65SYOSHIFUJI Hideaki struct net *net = sock_net(sk); 1774cdf507dSEric Dumazet struct dst_entry *dst; 17892d86829SDavid S. Miller bool res = false; 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds /* Informational messages are not limited. */ 1811da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 18292d86829SDavid S. Miller return true; 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvalds /* Do not limit pmtu discovery, it would break it. */ 1851da177e4SLinus Torvalds if (type == ICMPV6_PKT_TOOBIG) 18692d86829SDavid S. Miller return true; 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds /* 1891da177e4SLinus Torvalds * Look up the output route. 1901da177e4SLinus Torvalds * XXX: perhaps the expire for routing entries cloned by 1911da177e4SLinus Torvalds * this lookup should be more aggressive (not longer than timeout). 1921da177e4SLinus Torvalds */ 1934c9483b2SDavid S. Miller dst = ip6_route_output(net, sk, fl6); 1941da177e4SLinus Torvalds if (dst->error) { 1953bd653c8SDenis V. Lunev IP6_INC_STATS(net, ip6_dst_idev(dst), 196a11d206dSYOSHIFUJI Hideaki IPSTATS_MIB_OUTNOROUTES); 1971da177e4SLinus Torvalds } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { 19892d86829SDavid S. Miller res = true; 1991da177e4SLinus Torvalds } else { 2001da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 2019a43b709SBenjamin Thery int tmo = net->ipv6.sysctl.icmpv6_time; 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds /* Give more bandwidth to wider prefixes. */ 2041da177e4SLinus Torvalds if (rt->rt6i_dst.plen < 128) 2051da177e4SLinus Torvalds tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 2061da177e4SLinus Torvalds 2074cdf507dSEric Dumazet if (icmp_global_allow()) { 2084cdf507dSEric Dumazet struct inet_peer *peer; 2094cdf507dSEric Dumazet 2104cdf507dSEric Dumazet peer = inet_getpeer_v6(net->ipv6.peers, 211fd0273d7SMartin KaFai Lau &fl6->daddr, 1); 212fbfe95a4SDavid S. Miller res = inet_peer_xrlim_allow(peer, tmo); 2131d861aa4SDavid S. Miller if (peer) 2141d861aa4SDavid S. Miller inet_putpeer(peer); 2151da177e4SLinus Torvalds } 2164cdf507dSEric Dumazet } 2171da177e4SLinus Torvalds dst_release(dst); 2181da177e4SLinus Torvalds return res; 2191da177e4SLinus Torvalds } 2201da177e4SLinus Torvalds 2211da177e4SLinus Torvalds /* 2221da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2231da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2241da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2251da177e4SLinus Torvalds * highest-order two bits set to 10 2261da177e4SLinus Torvalds */ 2271da177e4SLinus Torvalds 228a50feda5SEric Dumazet static bool opt_unrec(struct sk_buff *skb, __u32 offset) 2291da177e4SLinus Torvalds { 2301da177e4SLinus Torvalds u8 _optval, *op; 2311da177e4SLinus Torvalds 232bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2331da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 23463159f29SIan Morris if (!op) 235a50feda5SEric Dumazet return true; 2361da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2371da177e4SLinus Torvalds } 2381da177e4SLinus Torvalds 2396d0bfe22SLorenzo Colitti int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 2406d0bfe22SLorenzo Colitti struct icmp6hdr *thdr, int len) 2411da177e4SLinus Torvalds { 2421da177e4SLinus Torvalds struct sk_buff *skb; 2431da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2441da177e4SLinus Torvalds int err = 0; 2451da177e4SLinus Torvalds 246e5d08d71SIan Morris skb = skb_peek(&sk->sk_write_queue); 24763159f29SIan Morris if (!skb) 2481da177e4SLinus Torvalds goto out; 2491da177e4SLinus Torvalds 250cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2511da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2521da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2531da177e4SLinus Torvalds 2541da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 25507f0757aSJoe Perches skb->csum = csum_partial(icmp6h, 2561da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2574c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2584c9483b2SDavid S. Miller &fl6->daddr, 2594c9483b2SDavid S. Miller len, fl6->flowi6_proto, 2601da177e4SLinus Torvalds skb->csum); 2611da177e4SLinus Torvalds } else { 262868c86bcSAl Viro __wsum tmp_csum = 0; 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2651da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2661da177e4SLinus Torvalds } 2671da177e4SLinus Torvalds 26807f0757aSJoe Perches tmp_csum = csum_partial(icmp6h, 2691da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 2704c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2714c9483b2SDavid S. Miller &fl6->daddr, 2724c9483b2SDavid S. Miller len, fl6->flowi6_proto, 273868c86bcSAl Viro tmp_csum); 2741da177e4SLinus Torvalds } 2751da177e4SLinus Torvalds ip6_push_pending_frames(sk); 2761da177e4SLinus Torvalds out: 2771da177e4SLinus Torvalds return err; 2781da177e4SLinus Torvalds } 2791da177e4SLinus Torvalds 2801da177e4SLinus Torvalds struct icmpv6_msg { 2811da177e4SLinus Torvalds struct sk_buff *skb; 2821da177e4SLinus Torvalds int offset; 283763ecff1SYasuyuki Kozakai uint8_t type; 2841da177e4SLinus Torvalds }; 2851da177e4SLinus Torvalds 2861da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 2871da177e4SLinus Torvalds { 2881da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 2891da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 2905f92a738SAl Viro __wsum csum = 0; 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 2931da177e4SLinus Torvalds to, len, csum); 2941da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 295763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 296763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 2971da177e4SLinus Torvalds return 0; 2981da177e4SLinus Torvalds } 2991da177e4SLinus Torvalds 30007a93626SAmerigo Wang #if IS_ENABLED(CONFIG_IPV6_MIP6) 30179383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 30279383236SMasahide NAKAMURA { 3030660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 30479383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 30579383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 30679383236SMasahide NAKAMURA struct in6_addr tmp; 30779383236SMasahide NAKAMURA int off; 30879383236SMasahide NAKAMURA 30979383236SMasahide NAKAMURA if (opt->dsthao) { 31079383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 31179383236SMasahide NAKAMURA if (likely(off >= 0)) { 312d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 313d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 3144e3fd7a0SAlexey Dobriyan tmp = iph->saddr; 3154e3fd7a0SAlexey Dobriyan iph->saddr = hao->addr; 3164e3fd7a0SAlexey Dobriyan hao->addr = tmp; 31779383236SMasahide NAKAMURA } 31879383236SMasahide NAKAMURA } 31979383236SMasahide NAKAMURA } 32079383236SMasahide NAKAMURA #else 32179383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 32279383236SMasahide NAKAMURA #endif 32379383236SMasahide NAKAMURA 324e8243534Sstephen hemminger static struct dst_entry *icmpv6_route_lookup(struct net *net, 325e8243534Sstephen hemminger struct sk_buff *skb, 326e8243534Sstephen hemminger struct sock *sk, 327e8243534Sstephen hemminger struct flowi6 *fl6) 328b42835dbSDavid S. Miller { 329b42835dbSDavid S. Miller struct dst_entry *dst, *dst2; 3304c9483b2SDavid S. Miller struct flowi6 fl2; 331b42835dbSDavid S. Miller int err; 332b42835dbSDavid S. Miller 333343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst, fl6); 334b42835dbSDavid S. Miller if (err) 335b42835dbSDavid S. Miller return ERR_PTR(err); 336b42835dbSDavid S. Miller 337b42835dbSDavid S. Miller /* 338b42835dbSDavid S. Miller * We won't send icmp if the destination is known 339b42835dbSDavid S. Miller * anycast. 340b42835dbSDavid S. Miller */ 3412647a9b0SMartin KaFai Lau if (ipv6_anycast_destination(dst, &fl6->daddr)) { 342ba7a46f1SJoe Perches net_dbg_ratelimited("icmp6_send: acast source\n"); 343b42835dbSDavid S. Miller dst_release(dst); 344b42835dbSDavid S. Miller return ERR_PTR(-EINVAL); 345b42835dbSDavid S. Miller } 346b42835dbSDavid S. Miller 347b42835dbSDavid S. Miller /* No need to clone since we're just using its address. */ 348b42835dbSDavid S. Miller dst2 = dst; 349b42835dbSDavid S. Miller 3504c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); 351452edd59SDavid S. Miller if (!IS_ERR(dst)) { 352b42835dbSDavid S. Miller if (dst != dst2) 353b42835dbSDavid S. Miller return dst; 354452edd59SDavid S. Miller } else { 355452edd59SDavid S. Miller if (PTR_ERR(dst) == -EPERM) 356b42835dbSDavid S. Miller dst = NULL; 357452edd59SDavid S. Miller else 358452edd59SDavid S. Miller return dst; 359b42835dbSDavid S. Miller } 360b42835dbSDavid S. Miller 3614c9483b2SDavid S. Miller err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); 362b42835dbSDavid S. Miller if (err) 363b42835dbSDavid S. Miller goto relookup_failed; 364b42835dbSDavid S. Miller 365343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst2, &fl2); 366b42835dbSDavid S. Miller if (err) 367b42835dbSDavid S. Miller goto relookup_failed; 368b42835dbSDavid S. Miller 3694c9483b2SDavid S. Miller dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); 370452edd59SDavid S. Miller if (!IS_ERR(dst2)) { 371b42835dbSDavid S. Miller dst_release(dst); 372b42835dbSDavid S. Miller dst = dst2; 373452edd59SDavid S. Miller } else { 374452edd59SDavid S. Miller err = PTR_ERR(dst2); 375452edd59SDavid S. Miller if (err == -EPERM) { 376b42835dbSDavid S. Miller dst_release(dst); 377452edd59SDavid S. Miller return dst2; 378452edd59SDavid S. Miller } else 379b42835dbSDavid S. Miller goto relookup_failed; 380b42835dbSDavid S. Miller } 381b42835dbSDavid S. Miller 382b42835dbSDavid S. Miller relookup_failed: 383b42835dbSDavid S. Miller if (dst) 384b42835dbSDavid S. Miller return dst; 385b42835dbSDavid S. Miller return ERR_PTR(err); 386b42835dbSDavid S. Miller } 387b42835dbSDavid S. Miller 3881da177e4SLinus Torvalds /* 3891da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 3901da177e4SLinus Torvalds */ 3915f5624cfSPravin B Shelar static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info) 3921da177e4SLinus Torvalds { 393c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 3941da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 3950660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 39684427d53SYOSHIFUJI Hideaki struct sock *sk; 39784427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 398b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 3991da177e4SLinus Torvalds struct dst_entry *dst; 4001da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 4014c9483b2SDavid S. Miller struct flowi6 fl6; 4021da177e4SLinus Torvalds struct icmpv6_msg msg; 403c14ac945SSoheil Hassas Yeganeh struct sockcm_cookie sockc_unused = {0}; 40426879da5SWei Wang struct ipcm6_cookie ipc6; 4051da177e4SLinus Torvalds int iif = 0; 4061da177e4SLinus Torvalds int addr_type = 0; 4071da177e4SLinus Torvalds int len; 4081da177e4SLinus Torvalds int err = 0; 409e110861fSLorenzo Colitti u32 mark = IP6_REPLY_MARK(net, skb->mark); 4101da177e4SLinus Torvalds 41127a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 41229a3cad5SSimon Horman (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb)) 4131da177e4SLinus Torvalds return; 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds /* 4161da177e4SLinus Torvalds * Make sure we respect the rules 4171da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 4185f5624cfSPravin B Shelar * Rule (e.1) is enforced by not using icmp6_send 4191da177e4SLinus Torvalds * in any code that processes icmp errors. 4201da177e4SLinus Torvalds */ 4211da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 4221da177e4SLinus Torvalds 423446fab59SFX Le Bail if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) || 424d94c1f92SFX Le Bail ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr)) 4251da177e4SLinus Torvalds saddr = &hdr->daddr; 4261da177e4SLinus Torvalds 4271da177e4SLinus Torvalds /* 4281da177e4SLinus Torvalds * Dest addr check 4291da177e4SLinus Torvalds */ 4301da177e4SLinus Torvalds 4319a6b4b39Szhuyj if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) { 4321da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 4331da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 4341da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 4351da177e4SLinus Torvalds (opt_unrec(skb, info)))) 4361da177e4SLinus Torvalds return; 4371da177e4SLinus Torvalds 4381da177e4SLinus Torvalds saddr = NULL; 4391da177e4SLinus Torvalds } 4401da177e4SLinus Torvalds 4411da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 4421da177e4SLinus Torvalds 4431da177e4SLinus Torvalds /* 4441da177e4SLinus Torvalds * Source addr check 4451da177e4SLinus Torvalds */ 4461da177e4SLinus Torvalds 447842df073SHannes Frederic Sowa if (__ipv6_addr_needs_scope_id(addr_type)) 4481da177e4SLinus Torvalds iif = skb->dev->ifindex; 4491d2f7b2dSDavid Ahern else 4501d2f7b2dSDavid Ahern iif = l3mdev_master_ifindex(skb->dev); 4511da177e4SLinus Torvalds 4521da177e4SLinus Torvalds /* 4538de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 4548de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 4558de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 4568de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 4571da177e4SLinus Torvalds */ 4581da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 4594b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n", 4604b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 4611da177e4SLinus Torvalds return; 4621da177e4SLinus Torvalds } 4631da177e4SLinus Torvalds 4641da177e4SLinus Torvalds /* 4651da177e4SLinus Torvalds * Never answer to a ICMP packet. 4661da177e4SLinus Torvalds */ 4671da177e4SLinus Torvalds if (is_ineligible(skb)) { 4684b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n", 4694b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 4701da177e4SLinus Torvalds return; 4711da177e4SLinus Torvalds } 4721da177e4SLinus Torvalds 47379383236SMasahide NAKAMURA mip6_addr_swap(skb); 47479383236SMasahide NAKAMURA 4754c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 4764c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 4774e3fd7a0SAlexey Dobriyan fl6.daddr = hdr->saddr; 4781da177e4SLinus Torvalds if (saddr) 4794e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 480e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 4814c9483b2SDavid S. Miller fl6.flowi6_oif = iif; 4821958b856SDavid S. Miller fl6.fl6_icmp_type = type; 4831958b856SDavid S. Miller fl6.fl6_icmp_code = code; 4844c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 4851da177e4SLinus Torvalds 486fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 48763159f29SIan Morris if (!sk) 488405666dbSDenis V. Lunev return; 489e110861fSLorenzo Colitti sk->sk_mark = mark; 490fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 491405666dbSDenis V. Lunev 4924c9483b2SDavid S. Miller if (!icmpv6_xrlim_allow(sk, type, &fl6)) 4931da177e4SLinus Torvalds goto out; 4941da177e4SLinus Torvalds 4951da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 4961da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 4971da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 4981da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 4991da177e4SLinus Torvalds 5004c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 5014c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 502c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 503c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 5041da177e4SLinus Torvalds 5054c9483b2SDavid S. Miller dst = icmpv6_route_lookup(net, skb, sk, &fl6); 506b42835dbSDavid S. Miller if (IS_ERR(dst)) 5071da177e4SLinus Torvalds goto out; 5088de3351eSYOSHIFUJI Hideaki 50926879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 51026879da5SWei Wang ipc6.tclass = np->tclass; 51126879da5SWei Wang ipc6.dontfrag = np->dontfrag; 51226879da5SWei Wang ipc6.opt = NULL; 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds msg.skb = skb; 515bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 516763ecff1SYasuyuki Kozakai msg.type = type; 5171da177e4SLinus Torvalds 5181da177e4SLinus Torvalds len = skb->len - msg.offset; 5191da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); 5201da177e4SLinus Torvalds if (len < 0) { 5214b3418fbSBjørn Mork net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n", 5224b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5231da177e4SLinus Torvalds goto out_dst_release; 5241da177e4SLinus Torvalds } 5251da177e4SLinus Torvalds 526cfdf7647SEric Dumazet rcu_read_lock(); 527cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 5281da177e4SLinus Torvalds 5291da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, 5301da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 53126879da5SWei Wang sizeof(struct icmp6hdr), 53226879da5SWei Wang &ipc6, &fl6, (struct rt6_info *)dst, 53326879da5SWei Wang MSG_DONTWAIT, &sockc_unused); 5341da177e4SLinus Torvalds if (err) { 53543a43b60SHannes Frederic Sowa ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 5361da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 537cfdf7647SEric Dumazet } else { 538cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 539cfdf7647SEric Dumazet len + sizeof(struct icmp6hdr)); 5401da177e4SLinus Torvalds } 541cfdf7647SEric Dumazet rcu_read_unlock(); 5421da177e4SLinus Torvalds out_dst_release: 5431da177e4SLinus Torvalds dst_release(dst); 5441da177e4SLinus Torvalds out: 545405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5461da177e4SLinus Torvalds } 5475f5624cfSPravin B Shelar 5485f5624cfSPravin B Shelar /* Slightly more convenient version of icmp6_send. 5495f5624cfSPravin B Shelar */ 5505f5624cfSPravin B Shelar void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) 5515f5624cfSPravin B Shelar { 5525f5624cfSPravin B Shelar icmp6_send(skb, ICMPV6_PARAMPROB, code, pos); 5535f5624cfSPravin B Shelar kfree_skb(skb); 5545f5624cfSPravin B Shelar } 5557159039aSYOSHIFUJI Hideaki 5561da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 5571da177e4SLinus Torvalds { 558c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 55984427d53SYOSHIFUJI Hideaki struct sock *sk; 5601da177e4SLinus Torvalds struct inet6_dev *idev; 56184427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 562b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 563cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 5641da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 5654c9483b2SDavid S. Miller struct flowi6 fl6; 5661da177e4SLinus Torvalds struct icmpv6_msg msg; 5671da177e4SLinus Torvalds struct dst_entry *dst; 56826879da5SWei Wang struct ipcm6_cookie ipc6; 5691da177e4SLinus Torvalds int err = 0; 570e110861fSLorenzo Colitti u32 mark = IP6_REPLY_MARK(net, skb->mark); 571c14ac945SSoheil Hassas Yeganeh struct sockcm_cookie sockc_unused = {0}; 5721da177e4SLinus Torvalds 5730660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 5741da177e4SLinus Torvalds 575509aba3bSFX Le Bail if (!ipv6_unicast_destination(skb) && 576ec35b61eSFX Le Bail !(net->ipv6.sysctl.anycast_src_echo_reply && 5772647a9b0SMartin KaFai Lau ipv6_anycast_destination(skb_dst(skb), saddr))) 5781da177e4SLinus Torvalds saddr = NULL; 5791da177e4SLinus Torvalds 5801da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 5811da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 5821da177e4SLinus Torvalds 5834c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 5844c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 5854e3fd7a0SAlexey Dobriyan fl6.daddr = ipv6_hdr(skb)->saddr; 5861da177e4SLinus Torvalds if (saddr) 5874e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 588ca254490SDavid Ahern fl6.flowi6_oif = l3mdev_fib_oif(skb->dev); 5891958b856SDavid S. Miller fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; 590e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 5914c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 5921da177e4SLinus Torvalds 593fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 59463159f29SIan Morris if (!sk) 595405666dbSDenis V. Lunev return; 596e110861fSLorenzo Colitti sk->sk_mark = mark; 597fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 598405666dbSDenis V. Lunev 5994c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 6004c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 601c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 602c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 6031da177e4SLinus Torvalds 604343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst, &fl6); 6051da177e4SLinus Torvalds if (err) 6061da177e4SLinus Torvalds goto out; 6074c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); 608452edd59SDavid S. Miller if (IS_ERR(dst)) 609e104411bSPatrick McHardy goto out; 6101da177e4SLinus Torvalds 611cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds msg.skb = skb; 6141da177e4SLinus Torvalds msg.offset = 0; 615763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 6161da177e4SLinus Torvalds 61726879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 61826879da5SWei Wang ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 61926879da5SWei Wang ipc6.dontfrag = np->dontfrag; 62026879da5SWei Wang ipc6.opt = NULL; 62126879da5SWei Wang 6221da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 62326879da5SWei Wang sizeof(struct icmp6hdr), &ipc6, &fl6, 62413b52cd4SBrian Haley (struct rt6_info *)dst, MSG_DONTWAIT, 62526879da5SWei Wang &sockc_unused); 6261da177e4SLinus Torvalds 6271da177e4SLinus Torvalds if (err) { 628a16292a0SEric Dumazet __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 6291da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 630cfdf7647SEric Dumazet } else { 631cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 632cfdf7647SEric Dumazet skb->len + sizeof(struct icmp6hdr)); 6331da177e4SLinus Torvalds } 6341da177e4SLinus Torvalds dst_release(dst); 6351da177e4SLinus Torvalds out: 636405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 6371da177e4SLinus Torvalds } 6381da177e4SLinus Torvalds 639b94f1c09SDavid S. Miller void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 6401da177e4SLinus Torvalds { 64141135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 6421da177e4SLinus Torvalds int inner_offset; 64375f2811cSJesse Gross __be16 frag_off; 644f9242b6bSDavid S. Miller u8 nexthdr; 6457304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 6461da177e4SLinus Torvalds 6471da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 6487304fe46SDuan Jiong goto out; 6491da177e4SLinus Torvalds 6501da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 6511da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 6521da177e4SLinus Torvalds /* now skip over extension headers */ 65375f2811cSJesse Gross inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 65475f2811cSJesse Gross &nexthdr, &frag_off); 6551da177e4SLinus Torvalds if (inner_offset < 0) 6567304fe46SDuan Jiong goto out; 6571da177e4SLinus Torvalds } else { 6581da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 6591da177e4SLinus Torvalds } 6601da177e4SLinus Torvalds 6611da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 6621da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 6637304fe46SDuan Jiong goto out; 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 6661da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 6671da177e4SLinus Torvalds pmtu discovery. 6681da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 6691da177e4SLinus Torvalds --ANK (980726) 6701da177e4SLinus Torvalds */ 6711da177e4SLinus Torvalds 672f9242b6bSDavid S. Miller ipprot = rcu_dereference(inet6_protos[nexthdr]); 6731da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 6741da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 6751da177e4SLinus Torvalds 67669d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 6777304fe46SDuan Jiong return; 6787304fe46SDuan Jiong 6797304fe46SDuan Jiong out: 680a16292a0SEric Dumazet __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); 6811da177e4SLinus Torvalds } 6821da177e4SLinus Torvalds 6831da177e4SLinus Torvalds /* 6841da177e4SLinus Torvalds * Handle icmp messages 6851da177e4SLinus Torvalds */ 6861da177e4SLinus Torvalds 687e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 6881da177e4SLinus Torvalds { 6891da177e4SLinus Torvalds struct net_device *dev = skb->dev; 6901da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 691b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 6921da177e4SLinus Torvalds struct icmp6hdr *hdr; 693d5fdd6baSBrian Haley u8 type; 694e3e32170SRick Jones bool success = false; 6951da177e4SLinus Torvalds 696aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 697def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 6988b7817f3SHerbert Xu int nh; 6998b7817f3SHerbert Xu 700def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 701aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 702aebcf82cSHerbert Xu goto drop_no_count; 703aebcf82cSHerbert Xu 70481aded24SDavid S. Miller if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) 7058b7817f3SHerbert Xu goto drop_no_count; 7068b7817f3SHerbert Xu 7078b7817f3SHerbert Xu nh = skb_network_offset(skb); 7088b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 7098b7817f3SHerbert Xu 7108b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 7118b7817f3SHerbert Xu goto drop_no_count; 7128b7817f3SHerbert Xu 7138b7817f3SHerbert Xu skb_set_network_header(skb, nh); 7148b7817f3SHerbert Xu } 7158b7817f3SHerbert Xu 716a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS); 7171da177e4SLinus Torvalds 7180660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 7190660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 7201da177e4SLinus Torvalds 72139471ac8STom Herbert if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { 722ba7a46f1SJoe Perches net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", 7230c6ce78aSHarvey Harrison saddr, daddr); 7246a5dc9e5SEric Dumazet goto csum_error; 7251da177e4SLinus Torvalds } 7261da177e4SLinus Torvalds 7278cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 7288cf22943SHerbert Xu goto discard_it; 7291da177e4SLinus Torvalds 730cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 7311da177e4SLinus Torvalds 7321da177e4SLinus Torvalds type = hdr->icmp6_type; 7331da177e4SLinus Torvalds 734f3832ed2SEric Dumazet ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type); 7351da177e4SLinus Torvalds 7361da177e4SLinus Torvalds switch (type) { 7371da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 7381da177e4SLinus Torvalds icmpv6_echo_reply(skb); 7391da177e4SLinus Torvalds break; 7401da177e4SLinus Torvalds 7411da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 742e3e32170SRick Jones success = ping_rcv(skb); 7431da177e4SLinus Torvalds break; 7441da177e4SLinus Torvalds 7451da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 7461da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 7471da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 7481da177e4SLinus Torvalds destination cache will allow to solve this problem 7491da177e4SLinus Torvalds --ANK (980726) 7501da177e4SLinus Torvalds */ 7511da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 7521da177e4SLinus Torvalds goto discard_it; 753cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 7541da177e4SLinus Torvalds 7551da177e4SLinus Torvalds /* 7561da177e4SLinus Torvalds * Drop through to notify 7571da177e4SLinus Torvalds */ 7581da177e4SLinus Torvalds 7591da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 7601da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 7611da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 7621da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7631da177e4SLinus Torvalds break; 7641da177e4SLinus Torvalds 7651da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 7661da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 7671da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 7681da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 7691da177e4SLinus Torvalds case NDISC_REDIRECT: 7701da177e4SLinus Torvalds ndisc_rcv(skb); 7711da177e4SLinus Torvalds break; 7721da177e4SLinus Torvalds 7731da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 7741da177e4SLinus Torvalds igmp6_event_query(skb); 7751da177e4SLinus Torvalds break; 7761da177e4SLinus Torvalds 7771da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 7781da177e4SLinus Torvalds igmp6_event_report(skb); 7791da177e4SLinus Torvalds break; 7801da177e4SLinus Torvalds 7811da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 7821da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 7831da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 7841da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 7851da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 7861da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 7871da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 7881da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 7891da177e4SLinus Torvalds break; 7901da177e4SLinus Torvalds 7911da177e4SLinus Torvalds default: 7921da177e4SLinus Torvalds /* informational */ 7931da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 7941da177e4SLinus Torvalds break; 7951da177e4SLinus Torvalds 7964b3418fbSBjørn Mork net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n", 7974b3418fbSBjørn Mork saddr, daddr); 798ea85a0a2SDavid S. Miller 7991da177e4SLinus Torvalds /* 8001da177e4SLinus Torvalds * error of unknown type. 8011da177e4SLinus Torvalds * must pass to upper level 8021da177e4SLinus Torvalds */ 8031da177e4SLinus Torvalds 8041da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 8053ff50b79SStephen Hemminger } 8063ff50b79SStephen Hemminger 807e3e32170SRick Jones /* until the v6 path can be better sorted assume failure and 808e3e32170SRick Jones * preserve the status quo behaviour for the rest of the paths to here 809e3e32170SRick Jones */ 810e3e32170SRick Jones if (success) 811e3e32170SRick Jones consume_skb(skb); 812e3e32170SRick Jones else 8131da177e4SLinus Torvalds kfree_skb(skb); 814e3e32170SRick Jones 8151da177e4SLinus Torvalds return 0; 8161da177e4SLinus Torvalds 8176a5dc9e5SEric Dumazet csum_error: 818a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); 8191da177e4SLinus Torvalds discard_it: 820a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS); 8218b7817f3SHerbert Xu drop_no_count: 8221da177e4SLinus Torvalds kfree_skb(skb); 8231da177e4SLinus Torvalds return 0; 8241da177e4SLinus Torvalds } 8251da177e4SLinus Torvalds 8264c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, 82795e41e93SYOSHIFUJI Hideaki u8 type, 82895e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 82995e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 83095e41e93SYOSHIFUJI Hideaki int oif) 83195e41e93SYOSHIFUJI Hideaki { 8324c9483b2SDavid S. Miller memset(fl6, 0, sizeof(*fl6)); 8334e3fd7a0SAlexey Dobriyan fl6->saddr = *saddr; 8344e3fd7a0SAlexey Dobriyan fl6->daddr = *daddr; 8354c9483b2SDavid S. Miller fl6->flowi6_proto = IPPROTO_ICMPV6; 8361958b856SDavid S. Miller fl6->fl6_icmp_type = type; 8371958b856SDavid S. Miller fl6->fl6_icmp_code = 0; 8384c9483b2SDavid S. Miller fl6->flowi6_oif = oif; 8394c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); 84095e41e93SYOSHIFUJI Hideaki } 84195e41e93SYOSHIFUJI Hideaki 84298c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 8431da177e4SLinus Torvalds { 8441da177e4SLinus Torvalds struct sock *sk; 8451da177e4SLinus Torvalds int err, i, j; 8461da177e4SLinus Torvalds 84798c6d1b2SDenis V. Lunev net->ipv6.icmp_sk = 84898c6d1b2SDenis V. Lunev kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); 84963159f29SIan Morris if (!net->ipv6.icmp_sk) 85079c91159SDenis V. Lunev return -ENOMEM; 85179c91159SDenis V. Lunev 8526f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8531ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 8541ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 8551da177e4SLinus Torvalds if (err < 0) { 856f3213831SJoe Perches pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", 8571da177e4SLinus Torvalds err); 8581da177e4SLinus Torvalds goto fail; 8591da177e4SLinus Torvalds } 8601da177e4SLinus Torvalds 8611ed8516fSDenis V. Lunev net->ipv6.icmp_sk[i] = sk; 8625c8cafd6SDenis V. Lunev 8631da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 8641da177e4SLinus Torvalds * sk_buff struct overhead. 8651da177e4SLinus Torvalds */ 86687fb4b7bSEric Dumazet sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); 8671da177e4SLinus Torvalds } 8681da177e4SLinus Torvalds return 0; 8691da177e4SLinus Torvalds 8701da177e4SLinus Torvalds fail: 8715c8cafd6SDenis V. Lunev for (j = 0; j < i; j++) 8721ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); 87398c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 8741da177e4SLinus Torvalds return err; 8751da177e4SLinus Torvalds } 8761da177e4SLinus Torvalds 87798c6d1b2SDenis V. Lunev static void __net_exit icmpv6_sk_exit(struct net *net) 8781da177e4SLinus Torvalds { 8791da177e4SLinus Torvalds int i; 8801da177e4SLinus Torvalds 8816f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8821ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); 8831da177e4SLinus Torvalds } 88498c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 88598c6d1b2SDenis V. Lunev } 88698c6d1b2SDenis V. Lunev 8878ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 88898c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 88998c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 89098c6d1b2SDenis V. Lunev }; 89198c6d1b2SDenis V. Lunev 89298c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 89398c6d1b2SDenis V. Lunev { 89498c6d1b2SDenis V. Lunev int err; 89598c6d1b2SDenis V. Lunev 89698c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 89798c6d1b2SDenis V. Lunev if (err < 0) 89898c6d1b2SDenis V. Lunev return err; 89998c6d1b2SDenis V. Lunev 90098c6d1b2SDenis V. Lunev err = -EAGAIN; 90198c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 90298c6d1b2SDenis V. Lunev goto fail; 9035f5624cfSPravin B Shelar 9045f5624cfSPravin B Shelar err = inet6_register_icmp_sender(icmp6_send); 9055f5624cfSPravin B Shelar if (err) 9065f5624cfSPravin B Shelar goto sender_reg_err; 90798c6d1b2SDenis V. Lunev return 0; 90898c6d1b2SDenis V. Lunev 9095f5624cfSPravin B Shelar sender_reg_err: 9105f5624cfSPravin B Shelar inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 91198c6d1b2SDenis V. Lunev fail: 912f3213831SJoe Perches pr_err("Failed to register ICMP6 protocol\n"); 91398c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 91498c6d1b2SDenis V. Lunev return err; 91598c6d1b2SDenis V. Lunev } 91698c6d1b2SDenis V. Lunev 9178ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 91898c6d1b2SDenis V. Lunev { 9195f5624cfSPravin B Shelar inet6_unregister_icmp_sender(icmp6_send); 92098c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 9211da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 9221da177e4SLinus Torvalds } 9231da177e4SLinus Torvalds 92498c6d1b2SDenis V. Lunev 9259b5b5cffSArjan van de Ven static const struct icmp6_err { 9261da177e4SLinus Torvalds int err; 9271da177e4SLinus Torvalds int fatal; 9281da177e4SLinus Torvalds } tab_unreach[] = { 9291da177e4SLinus Torvalds { /* NOROUTE */ 9301da177e4SLinus Torvalds .err = ENETUNREACH, 9311da177e4SLinus Torvalds .fatal = 0, 9321da177e4SLinus Torvalds }, 9331da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 9341da177e4SLinus Torvalds .err = EACCES, 9351da177e4SLinus Torvalds .fatal = 1, 9361da177e4SLinus Torvalds }, 9371da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 9381da177e4SLinus Torvalds .err = EHOSTUNREACH, 9391da177e4SLinus Torvalds .fatal = 0, 9401da177e4SLinus Torvalds }, 9411da177e4SLinus Torvalds { /* ADDR_UNREACH */ 9421da177e4SLinus Torvalds .err = EHOSTUNREACH, 9431da177e4SLinus Torvalds .fatal = 0, 9441da177e4SLinus Torvalds }, 9451da177e4SLinus Torvalds { /* PORT_UNREACH */ 9461da177e4SLinus Torvalds .err = ECONNREFUSED, 9471da177e4SLinus Torvalds .fatal = 1, 9481da177e4SLinus Torvalds }, 94961e76b17SJiri Bohac { /* POLICY_FAIL */ 95061e76b17SJiri Bohac .err = EACCES, 95161e76b17SJiri Bohac .fatal = 1, 95261e76b17SJiri Bohac }, 95361e76b17SJiri Bohac { /* REJECT_ROUTE */ 95461e76b17SJiri Bohac .err = EACCES, 95561e76b17SJiri Bohac .fatal = 1, 95661e76b17SJiri Bohac }, 9571da177e4SLinus Torvalds }; 9581da177e4SLinus Torvalds 959d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 9601da177e4SLinus Torvalds { 9611da177e4SLinus Torvalds int fatal = 0; 9621da177e4SLinus Torvalds 9631da177e4SLinus Torvalds *err = EPROTO; 9641da177e4SLinus Torvalds 9651da177e4SLinus Torvalds switch (type) { 9661da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 9671da177e4SLinus Torvalds fatal = 1; 96861e76b17SJiri Bohac if (code < ARRAY_SIZE(tab_unreach)) { 9691da177e4SLinus Torvalds *err = tab_unreach[code].err; 9701da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 9711da177e4SLinus Torvalds } 9721da177e4SLinus Torvalds break; 9731da177e4SLinus Torvalds 9741da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 9751da177e4SLinus Torvalds *err = EMSGSIZE; 9761da177e4SLinus Torvalds break; 9771da177e4SLinus Torvalds 9781da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 9791da177e4SLinus Torvalds *err = EPROTO; 9801da177e4SLinus Torvalds fatal = 1; 9811da177e4SLinus Torvalds break; 9821da177e4SLinus Torvalds 9831da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 9841da177e4SLinus Torvalds *err = EHOSTUNREACH; 9851da177e4SLinus Torvalds break; 9863ff50b79SStephen Hemminger } 9871da177e4SLinus Torvalds 9881da177e4SLinus Torvalds return fatal; 9891da177e4SLinus Torvalds } 9907159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 9917159039aSYOSHIFUJI Hideaki 9921da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 993e8243534Sstephen hemminger static struct ctl_table ipv6_icmp_table_template[] = { 9941da177e4SLinus Torvalds { 9951da177e4SLinus Torvalds .procname = "ratelimit", 99641a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 9971da177e4SLinus Torvalds .maxlen = sizeof(int), 9981da177e4SLinus Torvalds .mode = 0644, 9996d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 10001da177e4SLinus Torvalds }, 1001f8572d8fSEric W. Biederman { }, 10021da177e4SLinus Torvalds }; 1003760f2d01SDaniel Lezcano 10042c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 1005760f2d01SDaniel Lezcano { 1006760f2d01SDaniel Lezcano struct ctl_table *table; 1007760f2d01SDaniel Lezcano 1008760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 1009760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 1010760f2d01SDaniel Lezcano GFP_KERNEL); 10115ee09105SYOSHIFUJI Hideaki 1012c027aab4SEric W. Biederman if (table) 10135ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 10145ee09105SYOSHIFUJI Hideaki 1015760f2d01SDaniel Lezcano return table; 1016760f2d01SDaniel Lezcano } 10171da177e4SLinus Torvalds #endif 1018