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> 711da177e4SLinus Torvalds 721da177e4SLinus Torvalds #include <asm/uaccess.h> 731da177e4SLinus Torvalds 741da177e4SLinus Torvalds /* 751da177e4SLinus Torvalds * The ICMP socket(s). This is the most convenient way to flow control 761da177e4SLinus Torvalds * our ICMP output as well as maintain a clean interface throughout 771da177e4SLinus Torvalds * all layers. All Socketless IP sends will soon be gone. 781da177e4SLinus Torvalds * 791da177e4SLinus Torvalds * On SMP we have one ICMP socket per-cpu. 801da177e4SLinus Torvalds */ 8198c6d1b2SDenis V. Lunev static inline struct sock *icmpv6_sk(struct net *net) 8298c6d1b2SDenis V. Lunev { 8398c6d1b2SDenis V. Lunev return net->ipv6.icmp_sk[smp_processor_id()]; 8498c6d1b2SDenis V. Lunev } 851da177e4SLinus Torvalds 866f809da2SSteffen Klassert static void icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 876f809da2SSteffen Klassert u8 type, u8 code, int offset, __be32 info) 886f809da2SSteffen Klassert { 896d0bfe22SLorenzo Colitti /* icmpv6_notify checks 8 bytes can be pulled, icmp6hdr is 8 bytes */ 906d0bfe22SLorenzo Colitti struct icmp6hdr *icmp6 = (struct icmp6hdr *) (skb->data + offset); 916f809da2SSteffen Klassert struct net *net = dev_net(skb->dev); 926f809da2SSteffen Klassert 936f809da2SSteffen Klassert if (type == ICMPV6_PKT_TOOBIG) 946f809da2SSteffen Klassert ip6_update_pmtu(skb, net, info, 0, 0); 956f809da2SSteffen Klassert else if (type == NDISC_REDIRECT) 96b55b76b2SDuan Jiong ip6_redirect(skb, net, skb->dev->ifindex, 0); 976d0bfe22SLorenzo Colitti 986d0bfe22SLorenzo Colitti if (!(type & ICMPV6_INFOMSG_MASK)) 996d0bfe22SLorenzo Colitti if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST) 1006d0bfe22SLorenzo Colitti ping_err(skb, offset, info); 1016f809da2SSteffen Klassert } 1026f809da2SSteffen Klassert 103e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb); 1041da177e4SLinus Torvalds 10541135cc8SAlexey Dobriyan static const struct inet6_protocol icmpv6_protocol = { 1061da177e4SLinus Torvalds .handler = icmpv6_rcv, 1076f809da2SSteffen Klassert .err_handler = icmpv6_err, 1088b7817f3SHerbert Xu .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1091da177e4SLinus Torvalds }; 1101da177e4SLinus Torvalds 111fdc0bde9SDenis V. Lunev static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) 1121da177e4SLinus Torvalds { 113fdc0bde9SDenis V. Lunev struct sock *sk; 114fdc0bde9SDenis V. Lunev 1151da177e4SLinus Torvalds local_bh_disable(); 1161da177e4SLinus Torvalds 117fdc0bde9SDenis V. Lunev sk = icmpv6_sk(net); 118405666dbSDenis V. Lunev if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { 1191da177e4SLinus Torvalds /* This can happen if the output path (f.e. SIT or 1201da177e4SLinus Torvalds * ip6ip6 tunnel) signals dst_link_failure() for an 1211da177e4SLinus Torvalds * outgoing ICMP6 packet. 1221da177e4SLinus Torvalds */ 1231da177e4SLinus Torvalds local_bh_enable(); 124fdc0bde9SDenis V. Lunev return NULL; 1251da177e4SLinus Torvalds } 126fdc0bde9SDenis V. Lunev return sk; 1271da177e4SLinus Torvalds } 1281da177e4SLinus Torvalds 129405666dbSDenis V. Lunev static __inline__ void icmpv6_xmit_unlock(struct sock *sk) 1301da177e4SLinus Torvalds { 131405666dbSDenis V. Lunev spin_unlock_bh(&sk->sk_lock.slock); 1321da177e4SLinus Torvalds } 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds /* 1351da177e4SLinus Torvalds * Figure out, may we reply to this packet with icmp error. 1361da177e4SLinus Torvalds * 1371da177e4SLinus Torvalds * We do not reply, if: 1381da177e4SLinus Torvalds * - it was icmp error message. 1391da177e4SLinus Torvalds * - it is truncated, so that it is known, that protocol is ICMPV6 1401da177e4SLinus Torvalds * (i.e. in the middle of some exthdr) 1411da177e4SLinus Torvalds * 1421da177e4SLinus Torvalds * --ANK (980726) 1431da177e4SLinus Torvalds */ 1441da177e4SLinus Torvalds 145a50feda5SEric Dumazet static bool is_ineligible(const struct sk_buff *skb) 1461da177e4SLinus Torvalds { 1470660e03fSArnaldo Carvalho de Melo int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; 1481da177e4SLinus Torvalds int len = skb->len - ptr; 1490660e03fSArnaldo Carvalho de Melo __u8 nexthdr = ipv6_hdr(skb)->nexthdr; 15075f2811cSJesse Gross __be16 frag_off; 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds if (len < 0) 153a50feda5SEric Dumazet return true; 1541da177e4SLinus Torvalds 15575f2811cSJesse Gross ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off); 1561da177e4SLinus Torvalds if (ptr < 0) 157a50feda5SEric Dumazet return false; 1581da177e4SLinus Torvalds if (nexthdr == IPPROTO_ICMPV6) { 1591da177e4SLinus Torvalds u8 _type, *tp; 1601da177e4SLinus Torvalds tp = skb_header_pointer(skb, 1611da177e4SLinus Torvalds ptr+offsetof(struct icmp6hdr, icmp6_type), 1621da177e4SLinus Torvalds sizeof(_type), &_type); 16363159f29SIan Morris if (!tp || !(*tp & ICMPV6_INFOMSG_MASK)) 164a50feda5SEric Dumazet return true; 1651da177e4SLinus Torvalds } 166a50feda5SEric Dumazet return false; 1671da177e4SLinus Torvalds } 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvalds /* 1701da177e4SLinus Torvalds * Check the ICMP output rate limit 1711da177e4SLinus Torvalds */ 1724cdf507dSEric Dumazet static bool icmpv6_xrlim_allow(struct sock *sk, u8 type, 1734c9483b2SDavid S. Miller struct flowi6 *fl6) 1741da177e4SLinus Torvalds { 1753b1e0a65SYOSHIFUJI Hideaki struct net *net = sock_net(sk); 1764cdf507dSEric Dumazet struct dst_entry *dst; 17792d86829SDavid S. Miller bool res = false; 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds /* Informational messages are not limited. */ 1801da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 18192d86829SDavid S. Miller return true; 1821da177e4SLinus Torvalds 1831da177e4SLinus Torvalds /* Do not limit pmtu discovery, it would break it. */ 1841da177e4SLinus Torvalds if (type == ICMPV6_PKT_TOOBIG) 18592d86829SDavid S. Miller return true; 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds /* 1881da177e4SLinus Torvalds * Look up the output route. 1891da177e4SLinus Torvalds * XXX: perhaps the expire for routing entries cloned by 1901da177e4SLinus Torvalds * this lookup should be more aggressive (not longer than timeout). 1911da177e4SLinus Torvalds */ 1924c9483b2SDavid S. Miller dst = ip6_route_output(net, sk, fl6); 1931da177e4SLinus Torvalds if (dst->error) { 1943bd653c8SDenis V. Lunev IP6_INC_STATS(net, ip6_dst_idev(dst), 195a11d206dSYOSHIFUJI Hideaki IPSTATS_MIB_OUTNOROUTES); 1961da177e4SLinus Torvalds } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { 19792d86829SDavid S. Miller res = true; 1981da177e4SLinus Torvalds } else { 1991da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 2009a43b709SBenjamin Thery int tmo = net->ipv6.sysctl.icmpv6_time; 2011da177e4SLinus Torvalds 2021da177e4SLinus Torvalds /* Give more bandwidth to wider prefixes. */ 2031da177e4SLinus Torvalds if (rt->rt6i_dst.plen < 128) 2041da177e4SLinus Torvalds tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 2051da177e4SLinus Torvalds 2064cdf507dSEric Dumazet if (icmp_global_allow()) { 2074cdf507dSEric Dumazet struct inet_peer *peer; 2084cdf507dSEric Dumazet 2094cdf507dSEric Dumazet peer = inet_getpeer_v6(net->ipv6.peers, 2104cdf507dSEric Dumazet &rt->rt6i_dst.addr, 1); 211fbfe95a4SDavid S. Miller res = inet_peer_xrlim_allow(peer, tmo); 2121d861aa4SDavid S. Miller if (peer) 2131d861aa4SDavid S. Miller inet_putpeer(peer); 2141da177e4SLinus Torvalds } 2154cdf507dSEric Dumazet } 2161da177e4SLinus Torvalds dst_release(dst); 2171da177e4SLinus Torvalds return res; 2181da177e4SLinus Torvalds } 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds /* 2211da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2221da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2231da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2241da177e4SLinus Torvalds * highest-order two bits set to 10 2251da177e4SLinus Torvalds */ 2261da177e4SLinus Torvalds 227a50feda5SEric Dumazet static bool opt_unrec(struct sk_buff *skb, __u32 offset) 2281da177e4SLinus Torvalds { 2291da177e4SLinus Torvalds u8 _optval, *op; 2301da177e4SLinus Torvalds 231bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2321da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 23363159f29SIan Morris if (!op) 234a50feda5SEric Dumazet return true; 2351da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2361da177e4SLinus Torvalds } 2371da177e4SLinus Torvalds 2386d0bfe22SLorenzo Colitti int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 2396d0bfe22SLorenzo Colitti struct icmp6hdr *thdr, int len) 2401da177e4SLinus Torvalds { 2411da177e4SLinus Torvalds struct sk_buff *skb; 2421da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2431da177e4SLinus Torvalds int err = 0; 2441da177e4SLinus Torvalds 245e5d08d71SIan Morris skb = skb_peek(&sk->sk_write_queue); 24663159f29SIan Morris if (!skb) 2471da177e4SLinus Torvalds goto out; 2481da177e4SLinus Torvalds 249cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2501da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2511da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2521da177e4SLinus Torvalds 2531da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 25407f0757aSJoe Perches skb->csum = csum_partial(icmp6h, 2551da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2564c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2574c9483b2SDavid S. Miller &fl6->daddr, 2584c9483b2SDavid S. Miller len, fl6->flowi6_proto, 2591da177e4SLinus Torvalds skb->csum); 2601da177e4SLinus Torvalds } else { 261868c86bcSAl Viro __wsum tmp_csum = 0; 2621da177e4SLinus Torvalds 2631da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2641da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2651da177e4SLinus Torvalds } 2661da177e4SLinus Torvalds 26707f0757aSJoe Perches tmp_csum = csum_partial(icmp6h, 2681da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 2694c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2704c9483b2SDavid S. Miller &fl6->daddr, 2714c9483b2SDavid S. Miller len, fl6->flowi6_proto, 272868c86bcSAl Viro tmp_csum); 2731da177e4SLinus Torvalds } 2741da177e4SLinus Torvalds ip6_push_pending_frames(sk); 2751da177e4SLinus Torvalds out: 2761da177e4SLinus Torvalds return err; 2771da177e4SLinus Torvalds } 2781da177e4SLinus Torvalds 2791da177e4SLinus Torvalds struct icmpv6_msg { 2801da177e4SLinus Torvalds struct sk_buff *skb; 2811da177e4SLinus Torvalds int offset; 282763ecff1SYasuyuki Kozakai uint8_t type; 2831da177e4SLinus Torvalds }; 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 2861da177e4SLinus Torvalds { 2871da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 2881da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 2895f92a738SAl Viro __wsum csum = 0; 2901da177e4SLinus Torvalds 2911da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 2921da177e4SLinus Torvalds to, len, csum); 2931da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 294763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 295763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 2961da177e4SLinus Torvalds return 0; 2971da177e4SLinus Torvalds } 2981da177e4SLinus Torvalds 29907a93626SAmerigo Wang #if IS_ENABLED(CONFIG_IPV6_MIP6) 30079383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 30179383236SMasahide NAKAMURA { 3020660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 30379383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 30479383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 30579383236SMasahide NAKAMURA struct in6_addr tmp; 30679383236SMasahide NAKAMURA int off; 30779383236SMasahide NAKAMURA 30879383236SMasahide NAKAMURA if (opt->dsthao) { 30979383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 31079383236SMasahide NAKAMURA if (likely(off >= 0)) { 311d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 312d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 3134e3fd7a0SAlexey Dobriyan tmp = iph->saddr; 3144e3fd7a0SAlexey Dobriyan iph->saddr = hao->addr; 3154e3fd7a0SAlexey Dobriyan hao->addr = tmp; 31679383236SMasahide NAKAMURA } 31779383236SMasahide NAKAMURA } 31879383236SMasahide NAKAMURA } 31979383236SMasahide NAKAMURA #else 32079383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 32179383236SMasahide NAKAMURA #endif 32279383236SMasahide NAKAMURA 323e8243534Sstephen hemminger static struct dst_entry *icmpv6_route_lookup(struct net *net, 324e8243534Sstephen hemminger struct sk_buff *skb, 325e8243534Sstephen hemminger struct sock *sk, 326e8243534Sstephen hemminger struct flowi6 *fl6) 327b42835dbSDavid S. Miller { 328b42835dbSDavid S. Miller struct dst_entry *dst, *dst2; 3294c9483b2SDavid S. Miller struct flowi6 fl2; 330b42835dbSDavid S. Miller int err; 331b42835dbSDavid S. Miller 3324c9483b2SDavid S. Miller err = ip6_dst_lookup(sk, &dst, fl6); 333b42835dbSDavid S. Miller if (err) 334b42835dbSDavid S. Miller return ERR_PTR(err); 335b42835dbSDavid S. Miller 336b42835dbSDavid S. Miller /* 337b42835dbSDavid S. Miller * We won't send icmp if the destination is known 338b42835dbSDavid S. Miller * anycast. 339b42835dbSDavid S. Miller */ 340b42835dbSDavid S. Miller if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { 341ba7a46f1SJoe Perches net_dbg_ratelimited("icmp6_send: acast source\n"); 342b42835dbSDavid S. Miller dst_release(dst); 343b42835dbSDavid S. Miller return ERR_PTR(-EINVAL); 344b42835dbSDavid S. Miller } 345b42835dbSDavid S. Miller 346b42835dbSDavid S. Miller /* No need to clone since we're just using its address. */ 347b42835dbSDavid S. Miller dst2 = dst; 348b42835dbSDavid S. Miller 3494c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); 350452edd59SDavid S. Miller if (!IS_ERR(dst)) { 351b42835dbSDavid S. Miller if (dst != dst2) 352b42835dbSDavid S. Miller return dst; 353452edd59SDavid S. Miller } else { 354452edd59SDavid S. Miller if (PTR_ERR(dst) == -EPERM) 355b42835dbSDavid S. Miller dst = NULL; 356452edd59SDavid S. Miller else 357452edd59SDavid S. Miller return dst; 358b42835dbSDavid S. Miller } 359b42835dbSDavid S. Miller 3604c9483b2SDavid S. Miller err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); 361b42835dbSDavid S. Miller if (err) 362b42835dbSDavid S. Miller goto relookup_failed; 363b42835dbSDavid S. Miller 364b42835dbSDavid S. Miller err = ip6_dst_lookup(sk, &dst2, &fl2); 365b42835dbSDavid S. Miller if (err) 366b42835dbSDavid S. Miller goto relookup_failed; 367b42835dbSDavid S. Miller 3684c9483b2SDavid S. Miller dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); 369452edd59SDavid S. Miller if (!IS_ERR(dst2)) { 370b42835dbSDavid S. Miller dst_release(dst); 371b42835dbSDavid S. Miller dst = dst2; 372452edd59SDavid S. Miller } else { 373452edd59SDavid S. Miller err = PTR_ERR(dst2); 374452edd59SDavid S. Miller if (err == -EPERM) { 375b42835dbSDavid S. Miller dst_release(dst); 376452edd59SDavid S. Miller return dst2; 377452edd59SDavid S. Miller } else 378b42835dbSDavid S. Miller goto relookup_failed; 379b42835dbSDavid S. Miller } 380b42835dbSDavid S. Miller 381b42835dbSDavid S. Miller relookup_failed: 382b42835dbSDavid S. Miller if (dst) 383b42835dbSDavid S. Miller return dst; 384b42835dbSDavid S. Miller return ERR_PTR(err); 385b42835dbSDavid S. Miller } 386b42835dbSDavid S. Miller 3871da177e4SLinus Torvalds /* 3881da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 3891da177e4SLinus Torvalds */ 3905f5624cfSPravin B Shelar static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info) 3911da177e4SLinus Torvalds { 392c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 3931da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 3940660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 39584427d53SYOSHIFUJI Hideaki struct sock *sk; 39684427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 397b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 3981da177e4SLinus Torvalds struct dst_entry *dst; 3991da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 4004c9483b2SDavid S. Miller struct flowi6 fl6; 4011da177e4SLinus Torvalds struct icmpv6_msg msg; 4021da177e4SLinus Torvalds int iif = 0; 4031da177e4SLinus Torvalds int addr_type = 0; 4041da177e4SLinus Torvalds int len; 405e651f03aSGerrit Renker int hlimit; 4061da177e4SLinus Torvalds int err = 0; 407e110861fSLorenzo Colitti u32 mark = IP6_REPLY_MARK(net, skb->mark); 4081da177e4SLinus Torvalds 40927a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 41029a3cad5SSimon Horman (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb)) 4111da177e4SLinus Torvalds return; 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds /* 4141da177e4SLinus Torvalds * Make sure we respect the rules 4151da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 4165f5624cfSPravin B Shelar * Rule (e.1) is enforced by not using icmp6_send 4171da177e4SLinus Torvalds * in any code that processes icmp errors. 4181da177e4SLinus Torvalds */ 4191da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 4201da177e4SLinus Torvalds 421446fab59SFX Le Bail if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) || 422d94c1f92SFX Le Bail ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr)) 4231da177e4SLinus Torvalds saddr = &hdr->daddr; 4241da177e4SLinus Torvalds 4251da177e4SLinus Torvalds /* 4261da177e4SLinus Torvalds * Dest addr check 4271da177e4SLinus Torvalds */ 4281da177e4SLinus Torvalds 4299a6b4b39Szhuyj if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) { 4301da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 4311da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 4321da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 4331da177e4SLinus Torvalds (opt_unrec(skb, info)))) 4341da177e4SLinus Torvalds return; 4351da177e4SLinus Torvalds 4361da177e4SLinus Torvalds saddr = NULL; 4371da177e4SLinus Torvalds } 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 4401da177e4SLinus Torvalds 4411da177e4SLinus Torvalds /* 4421da177e4SLinus Torvalds * Source addr check 4431da177e4SLinus Torvalds */ 4441da177e4SLinus Torvalds 445842df073SHannes Frederic Sowa if (__ipv6_addr_needs_scope_id(addr_type)) 4461da177e4SLinus Torvalds iif = skb->dev->ifindex; 4471da177e4SLinus Torvalds 4481da177e4SLinus Torvalds /* 4498de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 4508de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 4518de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 4528de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 4531da177e4SLinus Torvalds */ 4541da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 455ba7a46f1SJoe Perches net_dbg_ratelimited("icmp6_send: addr_any/mcast source\n"); 4561da177e4SLinus Torvalds return; 4571da177e4SLinus Torvalds } 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds /* 4601da177e4SLinus Torvalds * Never answer to a ICMP packet. 4611da177e4SLinus Torvalds */ 4621da177e4SLinus Torvalds if (is_ineligible(skb)) { 463ba7a46f1SJoe Perches net_dbg_ratelimited("icmp6_send: no reply to icmp error\n"); 4641da177e4SLinus Torvalds return; 4651da177e4SLinus Torvalds } 4661da177e4SLinus Torvalds 46779383236SMasahide NAKAMURA mip6_addr_swap(skb); 46879383236SMasahide NAKAMURA 4694c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 4704c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 4714e3fd7a0SAlexey Dobriyan fl6.daddr = hdr->saddr; 4721da177e4SLinus Torvalds if (saddr) 4734e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 474e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 4754c9483b2SDavid S. Miller fl6.flowi6_oif = iif; 4761958b856SDavid S. Miller fl6.fl6_icmp_type = type; 4771958b856SDavid S. Miller fl6.fl6_icmp_code = code; 4784c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 4791da177e4SLinus Torvalds 480fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 48163159f29SIan Morris if (!sk) 482405666dbSDenis V. Lunev return; 483e110861fSLorenzo Colitti sk->sk_mark = mark; 484fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 485405666dbSDenis V. Lunev 4864c9483b2SDavid S. Miller if (!icmpv6_xrlim_allow(sk, type, &fl6)) 4871da177e4SLinus Torvalds goto out; 4881da177e4SLinus Torvalds 4891da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 4901da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 4911da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 4921da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 4931da177e4SLinus Torvalds 4944c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 4954c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 496c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 497c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 4981da177e4SLinus Torvalds 4994c9483b2SDavid S. Miller dst = icmpv6_route_lookup(net, skb, sk, &fl6); 500b42835dbSDavid S. Miller if (IS_ERR(dst)) 5011da177e4SLinus Torvalds goto out; 5028de3351eSYOSHIFUJI Hideaki 5035c98631cSLorenzo Colitti hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 5041da177e4SLinus Torvalds 5051da177e4SLinus Torvalds msg.skb = skb; 506bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 507763ecff1SYasuyuki Kozakai msg.type = type; 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds len = skb->len - msg.offset; 5101da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); 5111da177e4SLinus Torvalds if (len < 0) { 512ba7a46f1SJoe Perches net_dbg_ratelimited("icmp: len problem\n"); 5131da177e4SLinus Torvalds goto out_dst_release; 5141da177e4SLinus Torvalds } 5151da177e4SLinus Torvalds 516cfdf7647SEric Dumazet rcu_read_lock(); 517cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 5181da177e4SLinus Torvalds 5191da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, 5201da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 521e651f03aSGerrit Renker sizeof(struct icmp6hdr), hlimit, 5224c9483b2SDavid S. Miller np->tclass, NULL, &fl6, (struct rt6_info *)dst, 52313b52cd4SBrian Haley MSG_DONTWAIT, np->dontfrag); 5241da177e4SLinus Torvalds if (err) { 52543a43b60SHannes Frederic Sowa ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 5261da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 527cfdf7647SEric Dumazet } else { 528cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 529cfdf7647SEric Dumazet len + sizeof(struct icmp6hdr)); 5301da177e4SLinus Torvalds } 531cfdf7647SEric Dumazet rcu_read_unlock(); 5321da177e4SLinus Torvalds out_dst_release: 5331da177e4SLinus Torvalds dst_release(dst); 5341da177e4SLinus Torvalds out: 535405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5361da177e4SLinus Torvalds } 5375f5624cfSPravin B Shelar 5385f5624cfSPravin B Shelar /* Slightly more convenient version of icmp6_send. 5395f5624cfSPravin B Shelar */ 5405f5624cfSPravin B Shelar void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) 5415f5624cfSPravin B Shelar { 5425f5624cfSPravin B Shelar icmp6_send(skb, ICMPV6_PARAMPROB, code, pos); 5435f5624cfSPravin B Shelar kfree_skb(skb); 5445f5624cfSPravin B Shelar } 5457159039aSYOSHIFUJI Hideaki 5461da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 5471da177e4SLinus Torvalds { 548c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 54984427d53SYOSHIFUJI Hideaki struct sock *sk; 5501da177e4SLinus Torvalds struct inet6_dev *idev; 55184427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 552b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 553cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 5541da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 5554c9483b2SDavid S. Miller struct flowi6 fl6; 5561da177e4SLinus Torvalds struct icmpv6_msg msg; 5571da177e4SLinus Torvalds struct dst_entry *dst; 5581da177e4SLinus Torvalds int err = 0; 5591da177e4SLinus Torvalds int hlimit; 560825edac4SHannes Frederic Sowa u8 tclass; 561e110861fSLorenzo Colitti u32 mark = IP6_REPLY_MARK(net, skb->mark); 5621da177e4SLinus Torvalds 5630660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 5641da177e4SLinus Torvalds 565509aba3bSFX Le Bail if (!ipv6_unicast_destination(skb) && 566ec35b61eSFX Le Bail !(net->ipv6.sysctl.anycast_src_echo_reply && 567509aba3bSFX Le Bail ipv6_anycast_destination(skb))) 5681da177e4SLinus Torvalds saddr = NULL; 5691da177e4SLinus Torvalds 5701da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 5711da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 5721da177e4SLinus Torvalds 5734c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 5744c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 5754e3fd7a0SAlexey Dobriyan fl6.daddr = ipv6_hdr(skb)->saddr; 5761da177e4SLinus Torvalds if (saddr) 5774e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 5784c9483b2SDavid S. Miller fl6.flowi6_oif = skb->dev->ifindex; 5791958b856SDavid S. Miller fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; 580e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 5814c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 5821da177e4SLinus Torvalds 583fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 58463159f29SIan Morris if (!sk) 585405666dbSDenis V. Lunev return; 586e110861fSLorenzo Colitti sk->sk_mark = mark; 587fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 588405666dbSDenis V. Lunev 5894c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 5904c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 591c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 592c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 5931da177e4SLinus Torvalds 5944c9483b2SDavid S. Miller err = ip6_dst_lookup(sk, &dst, &fl6); 5951da177e4SLinus Torvalds if (err) 5961da177e4SLinus Torvalds goto out; 5974c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); 598452edd59SDavid S. Miller if (IS_ERR(dst)) 599e104411bSPatrick McHardy goto out; 6001da177e4SLinus Torvalds 6015c98631cSLorenzo Colitti hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 6021da177e4SLinus Torvalds 603cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 6041da177e4SLinus Torvalds 6051da177e4SLinus Torvalds msg.skb = skb; 6061da177e4SLinus Torvalds msg.offset = 0; 607763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 6081da177e4SLinus Torvalds 609825edac4SHannes Frederic Sowa tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 6101da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 611825edac4SHannes Frederic Sowa sizeof(struct icmp6hdr), hlimit, tclass, NULL, &fl6, 61213b52cd4SBrian Haley (struct rt6_info *)dst, MSG_DONTWAIT, 61313b52cd4SBrian Haley np->dontfrag); 6141da177e4SLinus Torvalds 6151da177e4SLinus Torvalds if (err) { 61600d9d6a1SEric Dumazet ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS); 6171da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 618cfdf7647SEric Dumazet } else { 619cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 620cfdf7647SEric Dumazet skb->len + sizeof(struct icmp6hdr)); 6211da177e4SLinus Torvalds } 6221da177e4SLinus Torvalds dst_release(dst); 6231da177e4SLinus Torvalds out: 624405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 6251da177e4SLinus Torvalds } 6261da177e4SLinus Torvalds 627b94f1c09SDavid S. Miller void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 6281da177e4SLinus Torvalds { 62941135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 6301da177e4SLinus Torvalds int inner_offset; 63175f2811cSJesse Gross __be16 frag_off; 632f9242b6bSDavid S. Miller u8 nexthdr; 6337304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 6341da177e4SLinus Torvalds 6351da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 6367304fe46SDuan Jiong goto out; 6371da177e4SLinus Torvalds 6381da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 6391da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 6401da177e4SLinus Torvalds /* now skip over extension headers */ 64175f2811cSJesse Gross inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 64275f2811cSJesse Gross &nexthdr, &frag_off); 6431da177e4SLinus Torvalds if (inner_offset < 0) 6447304fe46SDuan Jiong goto out; 6451da177e4SLinus Torvalds } else { 6461da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 6471da177e4SLinus Torvalds } 6481da177e4SLinus Torvalds 6491da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 6501da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 6517304fe46SDuan Jiong goto out; 6521da177e4SLinus Torvalds 6531da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 6541da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 6551da177e4SLinus Torvalds pmtu discovery. 6561da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 6571da177e4SLinus Torvalds --ANK (980726) 6581da177e4SLinus Torvalds */ 6591da177e4SLinus Torvalds 660f9242b6bSDavid S. Miller ipprot = rcu_dereference(inet6_protos[nexthdr]); 6611da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 6621da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 6631da177e4SLinus Torvalds 66469d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 6657304fe46SDuan Jiong return; 6667304fe46SDuan Jiong 6677304fe46SDuan Jiong out: 6687304fe46SDuan Jiong ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); 6691da177e4SLinus Torvalds } 6701da177e4SLinus Torvalds 6711da177e4SLinus Torvalds /* 6721da177e4SLinus Torvalds * Handle icmp messages 6731da177e4SLinus Torvalds */ 6741da177e4SLinus Torvalds 675e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 6761da177e4SLinus Torvalds { 6771da177e4SLinus Torvalds struct net_device *dev = skb->dev; 6781da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 679b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 6801da177e4SLinus Torvalds struct icmp6hdr *hdr; 681d5fdd6baSBrian Haley u8 type; 682e3e32170SRick Jones bool success = false; 6831da177e4SLinus Torvalds 684aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 685def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 6868b7817f3SHerbert Xu int nh; 6878b7817f3SHerbert Xu 688def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 689aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 690aebcf82cSHerbert Xu goto drop_no_count; 691aebcf82cSHerbert Xu 69281aded24SDavid S. Miller if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) 6938b7817f3SHerbert Xu goto drop_no_count; 6948b7817f3SHerbert Xu 6958b7817f3SHerbert Xu nh = skb_network_offset(skb); 6968b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 6978b7817f3SHerbert Xu 6988b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 6998b7817f3SHerbert Xu goto drop_no_count; 7008b7817f3SHerbert Xu 7018b7817f3SHerbert Xu skb_set_network_header(skb, nh); 7028b7817f3SHerbert Xu } 7038b7817f3SHerbert Xu 704e41b5368SDenis V. Lunev ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INMSGS); 7051da177e4SLinus Torvalds 7060660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 7070660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 7081da177e4SLinus Torvalds 70939471ac8STom Herbert if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { 710ba7a46f1SJoe Perches net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", 7110c6ce78aSHarvey Harrison saddr, daddr); 7126a5dc9e5SEric Dumazet goto csum_error; 7131da177e4SLinus Torvalds } 7141da177e4SLinus Torvalds 7158cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 7168cf22943SHerbert Xu goto discard_it; 7171da177e4SLinus Torvalds 718cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 7191da177e4SLinus Torvalds 7201da177e4SLinus Torvalds type = hdr->icmp6_type; 7211da177e4SLinus Torvalds 72255d43808SDenis V. Lunev ICMP6MSGIN_INC_STATS_BH(dev_net(dev), idev, type); 7231da177e4SLinus Torvalds 7241da177e4SLinus Torvalds switch (type) { 7251da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 7261da177e4SLinus Torvalds icmpv6_echo_reply(skb); 7271da177e4SLinus Torvalds break; 7281da177e4SLinus Torvalds 7291da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 730e3e32170SRick Jones success = ping_rcv(skb); 7311da177e4SLinus Torvalds break; 7321da177e4SLinus Torvalds 7331da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 7341da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 7351da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 7361da177e4SLinus Torvalds destination cache will allow to solve this problem 7371da177e4SLinus Torvalds --ANK (980726) 7381da177e4SLinus Torvalds */ 7391da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 7401da177e4SLinus Torvalds goto discard_it; 741cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 7421da177e4SLinus Torvalds 7431da177e4SLinus Torvalds /* 7441da177e4SLinus Torvalds * Drop through to notify 7451da177e4SLinus Torvalds */ 7461da177e4SLinus Torvalds 7471da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 7481da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 7491da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 7501da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7511da177e4SLinus Torvalds break; 7521da177e4SLinus Torvalds 7531da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 7541da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 7551da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 7561da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 7571da177e4SLinus Torvalds case NDISC_REDIRECT: 7581da177e4SLinus Torvalds ndisc_rcv(skb); 7591da177e4SLinus Torvalds break; 7601da177e4SLinus Torvalds 7611da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 7621da177e4SLinus Torvalds igmp6_event_query(skb); 7631da177e4SLinus Torvalds break; 7641da177e4SLinus Torvalds 7651da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 7661da177e4SLinus Torvalds igmp6_event_report(skb); 7671da177e4SLinus Torvalds break; 7681da177e4SLinus Torvalds 7691da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 7701da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 7711da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 7721da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 7731da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 7741da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 7751da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 7761da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 7771da177e4SLinus Torvalds break; 7781da177e4SLinus Torvalds 7791da177e4SLinus Torvalds default: 7801da177e4SLinus Torvalds /* informational */ 7811da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 7821da177e4SLinus Torvalds break; 7831da177e4SLinus Torvalds 784ba7a46f1SJoe Perches net_dbg_ratelimited("icmpv6: msg of unknown type\n"); 785ea85a0a2SDavid S. Miller 7861da177e4SLinus Torvalds /* 7871da177e4SLinus Torvalds * error of unknown type. 7881da177e4SLinus Torvalds * must pass to upper level 7891da177e4SLinus Torvalds */ 7901da177e4SLinus Torvalds 7911da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7923ff50b79SStephen Hemminger } 7933ff50b79SStephen Hemminger 794e3e32170SRick Jones /* until the v6 path can be better sorted assume failure and 795e3e32170SRick Jones * preserve the status quo behaviour for the rest of the paths to here 796e3e32170SRick Jones */ 797e3e32170SRick Jones if (success) 798e3e32170SRick Jones consume_skb(skb); 799e3e32170SRick Jones else 8001da177e4SLinus Torvalds kfree_skb(skb); 801e3e32170SRick Jones 8021da177e4SLinus Torvalds return 0; 8031da177e4SLinus Torvalds 8046a5dc9e5SEric Dumazet csum_error: 8056a5dc9e5SEric Dumazet ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); 8061da177e4SLinus Torvalds discard_it: 807e41b5368SDenis V. Lunev ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INERRORS); 8088b7817f3SHerbert Xu drop_no_count: 8091da177e4SLinus Torvalds kfree_skb(skb); 8101da177e4SLinus Torvalds return 0; 8111da177e4SLinus Torvalds } 8121da177e4SLinus Torvalds 8134c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, 81495e41e93SYOSHIFUJI Hideaki u8 type, 81595e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 81695e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 81795e41e93SYOSHIFUJI Hideaki int oif) 81895e41e93SYOSHIFUJI Hideaki { 8194c9483b2SDavid S. Miller memset(fl6, 0, sizeof(*fl6)); 8204e3fd7a0SAlexey Dobriyan fl6->saddr = *saddr; 8214e3fd7a0SAlexey Dobriyan fl6->daddr = *daddr; 8224c9483b2SDavid S. Miller fl6->flowi6_proto = IPPROTO_ICMPV6; 8231958b856SDavid S. Miller fl6->fl6_icmp_type = type; 8241958b856SDavid S. Miller fl6->fl6_icmp_code = 0; 8254c9483b2SDavid S. Miller fl6->flowi6_oif = oif; 8264c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); 82795e41e93SYOSHIFUJI Hideaki } 82895e41e93SYOSHIFUJI Hideaki 829640c41c7SIngo Molnar /* 830b7e729c4SDenis V. Lunev * Special lock-class for __icmpv6_sk: 831640c41c7SIngo Molnar */ 832640c41c7SIngo Molnar static struct lock_class_key icmpv6_socket_sk_dst_lock_key; 833640c41c7SIngo Molnar 83498c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 8351da177e4SLinus Torvalds { 8361da177e4SLinus Torvalds struct sock *sk; 8371da177e4SLinus Torvalds int err, i, j; 8381da177e4SLinus Torvalds 83998c6d1b2SDenis V. Lunev net->ipv6.icmp_sk = 84098c6d1b2SDenis V. Lunev kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); 84163159f29SIan Morris if (!net->ipv6.icmp_sk) 84279c91159SDenis V. Lunev return -ENOMEM; 84379c91159SDenis V. Lunev 8446f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8451ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 8461ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 8471da177e4SLinus Torvalds if (err < 0) { 848f3213831SJoe Perches pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", 8491da177e4SLinus Torvalds err); 8501da177e4SLinus Torvalds goto fail; 8511da177e4SLinus Torvalds } 8521da177e4SLinus Torvalds 8531ed8516fSDenis V. Lunev net->ipv6.icmp_sk[i] = sk; 8545c8cafd6SDenis V. Lunev 855640c41c7SIngo Molnar /* 856640c41c7SIngo Molnar * Split off their lock-class, because sk->sk_dst_lock 857640c41c7SIngo Molnar * gets used from softirqs, which is safe for 858b7e729c4SDenis V. Lunev * __icmpv6_sk (because those never get directly used 859640c41c7SIngo Molnar * via userspace syscalls), but unsafe for normal sockets. 860640c41c7SIngo Molnar */ 861640c41c7SIngo Molnar lockdep_set_class(&sk->sk_dst_lock, 862640c41c7SIngo Molnar &icmpv6_socket_sk_dst_lock_key); 8631da177e4SLinus Torvalds 8641da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 8651da177e4SLinus Torvalds * sk_buff struct overhead. 8661da177e4SLinus Torvalds */ 86787fb4b7bSEric Dumazet sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); 8681da177e4SLinus Torvalds } 8691da177e4SLinus Torvalds return 0; 8701da177e4SLinus Torvalds 8711da177e4SLinus Torvalds fail: 8725c8cafd6SDenis V. Lunev for (j = 0; j < i; j++) 8731ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); 87498c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 8751da177e4SLinus Torvalds return err; 8761da177e4SLinus Torvalds } 8771da177e4SLinus Torvalds 87898c6d1b2SDenis V. Lunev static void __net_exit icmpv6_sk_exit(struct net *net) 8791da177e4SLinus Torvalds { 8801da177e4SLinus Torvalds int i; 8811da177e4SLinus Torvalds 8826f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8831ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); 8841da177e4SLinus Torvalds } 88598c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 88698c6d1b2SDenis V. Lunev } 88798c6d1b2SDenis V. Lunev 8888ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 88998c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 89098c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 89198c6d1b2SDenis V. Lunev }; 89298c6d1b2SDenis V. Lunev 89398c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 89498c6d1b2SDenis V. Lunev { 89598c6d1b2SDenis V. Lunev int err; 89698c6d1b2SDenis V. Lunev 89798c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 89898c6d1b2SDenis V. Lunev if (err < 0) 89998c6d1b2SDenis V. Lunev return err; 90098c6d1b2SDenis V. Lunev 90198c6d1b2SDenis V. Lunev err = -EAGAIN; 90298c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 90398c6d1b2SDenis V. Lunev goto fail; 9045f5624cfSPravin B Shelar 9055f5624cfSPravin B Shelar err = inet6_register_icmp_sender(icmp6_send); 9065f5624cfSPravin B Shelar if (err) 9075f5624cfSPravin B Shelar goto sender_reg_err; 90898c6d1b2SDenis V. Lunev return 0; 90998c6d1b2SDenis V. Lunev 9105f5624cfSPravin B Shelar sender_reg_err: 9115f5624cfSPravin B Shelar inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 91298c6d1b2SDenis V. Lunev fail: 913f3213831SJoe Perches pr_err("Failed to register ICMP6 protocol\n"); 91498c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 91598c6d1b2SDenis V. Lunev return err; 91698c6d1b2SDenis V. Lunev } 91798c6d1b2SDenis V. Lunev 9188ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 91998c6d1b2SDenis V. Lunev { 9205f5624cfSPravin B Shelar inet6_unregister_icmp_sender(icmp6_send); 92198c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 9221da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 9231da177e4SLinus Torvalds } 9241da177e4SLinus Torvalds 92598c6d1b2SDenis V. Lunev 9269b5b5cffSArjan van de Ven static const struct icmp6_err { 9271da177e4SLinus Torvalds int err; 9281da177e4SLinus Torvalds int fatal; 9291da177e4SLinus Torvalds } tab_unreach[] = { 9301da177e4SLinus Torvalds { /* NOROUTE */ 9311da177e4SLinus Torvalds .err = ENETUNREACH, 9321da177e4SLinus Torvalds .fatal = 0, 9331da177e4SLinus Torvalds }, 9341da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 9351da177e4SLinus Torvalds .err = EACCES, 9361da177e4SLinus Torvalds .fatal = 1, 9371da177e4SLinus Torvalds }, 9381da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 9391da177e4SLinus Torvalds .err = EHOSTUNREACH, 9401da177e4SLinus Torvalds .fatal = 0, 9411da177e4SLinus Torvalds }, 9421da177e4SLinus Torvalds { /* ADDR_UNREACH */ 9431da177e4SLinus Torvalds .err = EHOSTUNREACH, 9441da177e4SLinus Torvalds .fatal = 0, 9451da177e4SLinus Torvalds }, 9461da177e4SLinus Torvalds { /* PORT_UNREACH */ 9471da177e4SLinus Torvalds .err = ECONNREFUSED, 9481da177e4SLinus Torvalds .fatal = 1, 9491da177e4SLinus Torvalds }, 95061e76b17SJiri Bohac { /* POLICY_FAIL */ 95161e76b17SJiri Bohac .err = EACCES, 95261e76b17SJiri Bohac .fatal = 1, 95361e76b17SJiri Bohac }, 95461e76b17SJiri Bohac { /* REJECT_ROUTE */ 95561e76b17SJiri Bohac .err = EACCES, 95661e76b17SJiri Bohac .fatal = 1, 95761e76b17SJiri Bohac }, 9581da177e4SLinus Torvalds }; 9591da177e4SLinus Torvalds 960d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 9611da177e4SLinus Torvalds { 9621da177e4SLinus Torvalds int fatal = 0; 9631da177e4SLinus Torvalds 9641da177e4SLinus Torvalds *err = EPROTO; 9651da177e4SLinus Torvalds 9661da177e4SLinus Torvalds switch (type) { 9671da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 9681da177e4SLinus Torvalds fatal = 1; 96961e76b17SJiri Bohac if (code < ARRAY_SIZE(tab_unreach)) { 9701da177e4SLinus Torvalds *err = tab_unreach[code].err; 9711da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 9721da177e4SLinus Torvalds } 9731da177e4SLinus Torvalds break; 9741da177e4SLinus Torvalds 9751da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 9761da177e4SLinus Torvalds *err = EMSGSIZE; 9771da177e4SLinus Torvalds break; 9781da177e4SLinus Torvalds 9791da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 9801da177e4SLinus Torvalds *err = EPROTO; 9811da177e4SLinus Torvalds fatal = 1; 9821da177e4SLinus Torvalds break; 9831da177e4SLinus Torvalds 9841da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 9851da177e4SLinus Torvalds *err = EHOSTUNREACH; 9861da177e4SLinus Torvalds break; 9873ff50b79SStephen Hemminger } 9881da177e4SLinus Torvalds 9891da177e4SLinus Torvalds return fatal; 9901da177e4SLinus Torvalds } 9917159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 9927159039aSYOSHIFUJI Hideaki 9931da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 994e8243534Sstephen hemminger static struct ctl_table ipv6_icmp_table_template[] = { 9951da177e4SLinus Torvalds { 9961da177e4SLinus Torvalds .procname = "ratelimit", 99741a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 9981da177e4SLinus Torvalds .maxlen = sizeof(int), 9991da177e4SLinus Torvalds .mode = 0644, 10006d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 10011da177e4SLinus Torvalds }, 1002f8572d8fSEric W. Biederman { }, 10031da177e4SLinus Torvalds }; 1004760f2d01SDaniel Lezcano 10052c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 1006760f2d01SDaniel Lezcano { 1007760f2d01SDaniel Lezcano struct ctl_table *table; 1008760f2d01SDaniel Lezcano 1009760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 1010760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 1011760f2d01SDaniel Lezcano GFP_KERNEL); 10125ee09105SYOSHIFUJI Hideaki 1013c027aab4SEric W. Biederman if (table) 10145ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 10155ee09105SYOSHIFUJI Hideaki 1016760f2d01SDaniel Lezcano return table; 1017760f2d01SDaniel Lezcano } 10181da177e4SLinus Torvalds #endif 1019