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 321da177e4SLinus Torvalds #include <linux/module.h> 331da177e4SLinus Torvalds #include <linux/errno.h> 341da177e4SLinus Torvalds #include <linux/types.h> 351da177e4SLinus Torvalds #include <linux/socket.h> 361da177e4SLinus Torvalds #include <linux/in.h> 371da177e4SLinus Torvalds #include <linux/kernel.h> 381da177e4SLinus Torvalds #include <linux/sockios.h> 391da177e4SLinus Torvalds #include <linux/net.h> 401da177e4SLinus Torvalds #include <linux/skbuff.h> 411da177e4SLinus Torvalds #include <linux/init.h> 42763ecff1SYasuyuki Kozakai #include <linux/netfilter.h> 435a0e3ad6STejun Heo #include <linux/slab.h> 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 461da177e4SLinus Torvalds #include <linux/sysctl.h> 471da177e4SLinus Torvalds #endif 481da177e4SLinus Torvalds 491da177e4SLinus Torvalds #include <linux/inet.h> 501da177e4SLinus Torvalds #include <linux/netdevice.h> 511da177e4SLinus Torvalds #include <linux/icmpv6.h> 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds #include <net/ip.h> 541da177e4SLinus Torvalds #include <net/sock.h> 551da177e4SLinus Torvalds 561da177e4SLinus Torvalds #include <net/ipv6.h> 571da177e4SLinus Torvalds #include <net/ip6_checksum.h> 581da177e4SLinus Torvalds #include <net/protocol.h> 591da177e4SLinus Torvalds #include <net/raw.h> 601da177e4SLinus Torvalds #include <net/rawv6.h> 611da177e4SLinus Torvalds #include <net/transp_v6.h> 621da177e4SLinus Torvalds #include <net/ip6_route.h> 631da177e4SLinus Torvalds #include <net/addrconf.h> 641da177e4SLinus Torvalds #include <net/icmp.h> 658b7817f3SHerbert Xu #include <net/xfrm.h> 661ed8516fSDenis V. Lunev #include <net/inet_common.h> 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds #include <asm/uaccess.h> 691da177e4SLinus Torvalds #include <asm/system.h> 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds /* 721da177e4SLinus Torvalds * The ICMP socket(s). This is the most convenient way to flow control 731da177e4SLinus Torvalds * our ICMP output as well as maintain a clean interface throughout 741da177e4SLinus Torvalds * all layers. All Socketless IP sends will soon be gone. 751da177e4SLinus Torvalds * 761da177e4SLinus Torvalds * On SMP we have one ICMP socket per-cpu. 771da177e4SLinus Torvalds */ 7898c6d1b2SDenis V. Lunev static inline struct sock *icmpv6_sk(struct net *net) 7998c6d1b2SDenis V. Lunev { 8098c6d1b2SDenis V. Lunev return net->ipv6.icmp_sk[smp_processor_id()]; 8198c6d1b2SDenis V. Lunev } 821da177e4SLinus Torvalds 83e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb); 841da177e4SLinus Torvalds 8541135cc8SAlexey Dobriyan static const struct inet6_protocol icmpv6_protocol = { 861da177e4SLinus Torvalds .handler = icmpv6_rcv, 878b7817f3SHerbert Xu .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 881da177e4SLinus Torvalds }; 891da177e4SLinus Torvalds 90fdc0bde9SDenis V. Lunev static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) 911da177e4SLinus Torvalds { 92fdc0bde9SDenis V. Lunev struct sock *sk; 93fdc0bde9SDenis V. Lunev 941da177e4SLinus Torvalds local_bh_disable(); 951da177e4SLinus Torvalds 96fdc0bde9SDenis V. Lunev sk = icmpv6_sk(net); 97405666dbSDenis V. Lunev if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { 981da177e4SLinus Torvalds /* This can happen if the output path (f.e. SIT or 991da177e4SLinus Torvalds * ip6ip6 tunnel) signals dst_link_failure() for an 1001da177e4SLinus Torvalds * outgoing ICMP6 packet. 1011da177e4SLinus Torvalds */ 1021da177e4SLinus Torvalds local_bh_enable(); 103fdc0bde9SDenis V. Lunev return NULL; 1041da177e4SLinus Torvalds } 105fdc0bde9SDenis V. Lunev return sk; 1061da177e4SLinus Torvalds } 1071da177e4SLinus Torvalds 108405666dbSDenis V. Lunev static __inline__ void icmpv6_xmit_unlock(struct sock *sk) 1091da177e4SLinus Torvalds { 110405666dbSDenis V. Lunev spin_unlock_bh(&sk->sk_lock.slock); 1111da177e4SLinus Torvalds } 1121da177e4SLinus Torvalds 1131da177e4SLinus Torvalds /* 1141da177e4SLinus Torvalds * Slightly more convenient version of icmpv6_send. 1151da177e4SLinus Torvalds */ 116d5fdd6baSBrian Haley void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) 1171da177e4SLinus Torvalds { 1183ffe533cSAlexey Dobriyan icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos); 1191da177e4SLinus Torvalds kfree_skb(skb); 1201da177e4SLinus Torvalds } 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds /* 1231da177e4SLinus Torvalds * Figure out, may we reply to this packet with icmp error. 1241da177e4SLinus Torvalds * 1251da177e4SLinus Torvalds * We do not reply, if: 1261da177e4SLinus Torvalds * - it was icmp error message. 1271da177e4SLinus Torvalds * - it is truncated, so that it is known, that protocol is ICMPV6 1281da177e4SLinus Torvalds * (i.e. in the middle of some exthdr) 1291da177e4SLinus Torvalds * 1301da177e4SLinus Torvalds * --ANK (980726) 1311da177e4SLinus Torvalds */ 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvalds static int is_ineligible(struct sk_buff *skb) 1341da177e4SLinus Torvalds { 1350660e03fSArnaldo Carvalho de Melo int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; 1361da177e4SLinus Torvalds int len = skb->len - ptr; 1370660e03fSArnaldo Carvalho de Melo __u8 nexthdr = ipv6_hdr(skb)->nexthdr; 13875f2811cSJesse Gross __be16 frag_off; 1391da177e4SLinus Torvalds 1401da177e4SLinus Torvalds if (len < 0) 1411da177e4SLinus Torvalds return 1; 1421da177e4SLinus Torvalds 14375f2811cSJesse Gross ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off); 1441da177e4SLinus Torvalds if (ptr < 0) 1451da177e4SLinus Torvalds return 0; 1461da177e4SLinus Torvalds if (nexthdr == IPPROTO_ICMPV6) { 1471da177e4SLinus Torvalds u8 _type, *tp; 1481da177e4SLinus Torvalds tp = skb_header_pointer(skb, 1491da177e4SLinus Torvalds ptr+offsetof(struct icmp6hdr, icmp6_type), 1501da177e4SLinus Torvalds sizeof(_type), &_type); 1511da177e4SLinus Torvalds if (tp == NULL || 1521da177e4SLinus Torvalds !(*tp & ICMPV6_INFOMSG_MASK)) 1531da177e4SLinus Torvalds return 1; 1541da177e4SLinus Torvalds } 1551da177e4SLinus Torvalds return 0; 1561da177e4SLinus Torvalds } 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds /* 1591da177e4SLinus Torvalds * Check the ICMP output rate limit 1601da177e4SLinus Torvalds */ 16192d86829SDavid S. Miller static inline bool icmpv6_xrlim_allow(struct sock *sk, u8 type, 1624c9483b2SDavid S. Miller struct flowi6 *fl6) 1631da177e4SLinus Torvalds { 1641da177e4SLinus Torvalds struct dst_entry *dst; 1653b1e0a65SYOSHIFUJI Hideaki struct net *net = sock_net(sk); 16692d86829SDavid S. Miller bool res = false; 1671da177e4SLinus Torvalds 1681da177e4SLinus Torvalds /* Informational messages are not limited. */ 1691da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 17092d86829SDavid S. Miller return true; 1711da177e4SLinus Torvalds 1721da177e4SLinus Torvalds /* Do not limit pmtu discovery, it would break it. */ 1731da177e4SLinus Torvalds if (type == ICMPV6_PKT_TOOBIG) 17492d86829SDavid S. Miller return true; 1751da177e4SLinus Torvalds 1761da177e4SLinus Torvalds /* 1771da177e4SLinus Torvalds * Look up the output route. 1781da177e4SLinus Torvalds * XXX: perhaps the expire for routing entries cloned by 1791da177e4SLinus Torvalds * this lookup should be more aggressive (not longer than timeout). 1801da177e4SLinus Torvalds */ 1814c9483b2SDavid S. Miller dst = ip6_route_output(net, sk, fl6); 1821da177e4SLinus Torvalds if (dst->error) { 1833bd653c8SDenis V. Lunev IP6_INC_STATS(net, ip6_dst_idev(dst), 184a11d206dSYOSHIFUJI Hideaki IPSTATS_MIB_OUTNOROUTES); 1851da177e4SLinus Torvalds } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { 18692d86829SDavid S. Miller res = true; 1871da177e4SLinus Torvalds } else { 1881da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 1899a43b709SBenjamin Thery int tmo = net->ipv6.sysctl.icmpv6_time; 1901da177e4SLinus Torvalds 1911da177e4SLinus Torvalds /* Give more bandwidth to wider prefixes. */ 1921da177e4SLinus Torvalds if (rt->rt6i_dst.plen < 128) 1931da177e4SLinus Torvalds tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 1941da177e4SLinus Torvalds 19592d86829SDavid S. Miller if (!rt->rt6i_peer) 19692d86829SDavid S. Miller rt6_bind_peer(rt, 1); 19792d86829SDavid S. Miller res = inet_peer_xrlim_allow(rt->rt6i_peer, tmo); 1981da177e4SLinus Torvalds } 1991da177e4SLinus Torvalds dst_release(dst); 2001da177e4SLinus Torvalds return res; 2011da177e4SLinus Torvalds } 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds /* 2041da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2051da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2061da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2071da177e4SLinus Torvalds * highest-order two bits set to 10 2081da177e4SLinus Torvalds */ 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds static __inline__ int opt_unrec(struct sk_buff *skb, __u32 offset) 2111da177e4SLinus Torvalds { 2121da177e4SLinus Torvalds u8 _optval, *op; 2131da177e4SLinus Torvalds 214bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2151da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 2161da177e4SLinus Torvalds if (op == NULL) 2171da177e4SLinus Torvalds return 1; 2181da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2191da177e4SLinus Torvalds } 2201da177e4SLinus Torvalds 2214c9483b2SDavid S. Miller static int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, struct icmp6hdr *thdr, int len) 2221da177e4SLinus Torvalds { 2231da177e4SLinus Torvalds struct sk_buff *skb; 2241da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2251da177e4SLinus Torvalds int err = 0; 2261da177e4SLinus Torvalds 2271da177e4SLinus Torvalds if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 2281da177e4SLinus Torvalds goto out; 2291da177e4SLinus Torvalds 230cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2311da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2321da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2331da177e4SLinus Torvalds 2341da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 23507f0757aSJoe Perches skb->csum = csum_partial(icmp6h, 2361da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2374c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2384c9483b2SDavid S. Miller &fl6->daddr, 2394c9483b2SDavid S. Miller len, fl6->flowi6_proto, 2401da177e4SLinus Torvalds skb->csum); 2411da177e4SLinus Torvalds } else { 242868c86bcSAl Viro __wsum tmp_csum = 0; 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2451da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2461da177e4SLinus Torvalds } 2471da177e4SLinus Torvalds 24807f0757aSJoe Perches tmp_csum = csum_partial(icmp6h, 2491da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 2504c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2514c9483b2SDavid S. Miller &fl6->daddr, 2524c9483b2SDavid S. Miller len, fl6->flowi6_proto, 253868c86bcSAl Viro tmp_csum); 2541da177e4SLinus Torvalds } 2551da177e4SLinus Torvalds ip6_push_pending_frames(sk); 2561da177e4SLinus Torvalds out: 2571da177e4SLinus Torvalds return err; 2581da177e4SLinus Torvalds } 2591da177e4SLinus Torvalds 2601da177e4SLinus Torvalds struct icmpv6_msg { 2611da177e4SLinus Torvalds struct sk_buff *skb; 2621da177e4SLinus Torvalds int offset; 263763ecff1SYasuyuki Kozakai uint8_t type; 2641da177e4SLinus Torvalds }; 2651da177e4SLinus Torvalds 2661da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 2671da177e4SLinus Torvalds { 2681da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 2691da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 2705f92a738SAl Viro __wsum csum = 0; 2711da177e4SLinus Torvalds 2721da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 2731da177e4SLinus Torvalds to, len, csum); 2741da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 275763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 276763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 2771da177e4SLinus Torvalds return 0; 2781da177e4SLinus Torvalds } 2791da177e4SLinus Torvalds 28059fbb3a6SMasahide NAKAMURA #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 28179383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 28279383236SMasahide NAKAMURA { 2830660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 28479383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 28579383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 28679383236SMasahide NAKAMURA struct in6_addr tmp; 28779383236SMasahide NAKAMURA int off; 28879383236SMasahide NAKAMURA 28979383236SMasahide NAKAMURA if (opt->dsthao) { 29079383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 29179383236SMasahide NAKAMURA if (likely(off >= 0)) { 292d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 293d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 2944e3fd7a0SAlexey Dobriyan tmp = iph->saddr; 2954e3fd7a0SAlexey Dobriyan iph->saddr = hao->addr; 2964e3fd7a0SAlexey Dobriyan hao->addr = tmp; 29779383236SMasahide NAKAMURA } 29879383236SMasahide NAKAMURA } 29979383236SMasahide NAKAMURA } 30079383236SMasahide NAKAMURA #else 30179383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 30279383236SMasahide NAKAMURA #endif 30379383236SMasahide NAKAMURA 304b42835dbSDavid S. Miller static struct dst_entry *icmpv6_route_lookup(struct net *net, struct sk_buff *skb, 3054c9483b2SDavid S. Miller struct sock *sk, struct flowi6 *fl6) 306b42835dbSDavid S. Miller { 307b42835dbSDavid S. Miller struct dst_entry *dst, *dst2; 3084c9483b2SDavid S. Miller struct flowi6 fl2; 309b42835dbSDavid S. Miller int err; 310b42835dbSDavid S. Miller 3114c9483b2SDavid S. Miller err = ip6_dst_lookup(sk, &dst, fl6); 312b42835dbSDavid S. Miller if (err) 313b42835dbSDavid S. Miller return ERR_PTR(err); 314b42835dbSDavid S. Miller 315b42835dbSDavid S. Miller /* 316b42835dbSDavid S. Miller * We won't send icmp if the destination is known 317b42835dbSDavid S. Miller * anycast. 318b42835dbSDavid S. Miller */ 319b42835dbSDavid S. Miller if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { 320b42835dbSDavid S. Miller LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n"); 321b42835dbSDavid S. Miller dst_release(dst); 322b42835dbSDavid S. Miller return ERR_PTR(-EINVAL); 323b42835dbSDavid S. Miller } 324b42835dbSDavid S. Miller 325b42835dbSDavid S. Miller /* No need to clone since we're just using its address. */ 326b42835dbSDavid S. Miller dst2 = dst; 327b42835dbSDavid S. Miller 3284c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); 329452edd59SDavid S. Miller if (!IS_ERR(dst)) { 330b42835dbSDavid S. Miller if (dst != dst2) 331b42835dbSDavid S. Miller return dst; 332452edd59SDavid S. Miller } else { 333452edd59SDavid S. Miller if (PTR_ERR(dst) == -EPERM) 334b42835dbSDavid S. Miller dst = NULL; 335452edd59SDavid S. Miller else 336452edd59SDavid S. Miller return dst; 337b42835dbSDavid S. Miller } 338b42835dbSDavid S. Miller 3394c9483b2SDavid S. Miller err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); 340b42835dbSDavid S. Miller if (err) 341b42835dbSDavid S. Miller goto relookup_failed; 342b42835dbSDavid S. Miller 343b42835dbSDavid S. Miller err = ip6_dst_lookup(sk, &dst2, &fl2); 344b42835dbSDavid S. Miller if (err) 345b42835dbSDavid S. Miller goto relookup_failed; 346b42835dbSDavid S. Miller 3474c9483b2SDavid S. Miller dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); 348452edd59SDavid S. Miller if (!IS_ERR(dst2)) { 349b42835dbSDavid S. Miller dst_release(dst); 350b42835dbSDavid S. Miller dst = dst2; 351452edd59SDavid S. Miller } else { 352452edd59SDavid S. Miller err = PTR_ERR(dst2); 353452edd59SDavid S. Miller if (err == -EPERM) { 354b42835dbSDavid S. Miller dst_release(dst); 355452edd59SDavid S. Miller return dst2; 356452edd59SDavid S. Miller } else 357b42835dbSDavid S. Miller goto relookup_failed; 358b42835dbSDavid S. Miller } 359b42835dbSDavid S. Miller 360b42835dbSDavid S. Miller relookup_failed: 361b42835dbSDavid S. Miller if (dst) 362b42835dbSDavid S. Miller return dst; 363b42835dbSDavid S. Miller return ERR_PTR(err); 364b42835dbSDavid S. Miller } 365b42835dbSDavid S. Miller 3661da177e4SLinus Torvalds /* 3671da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 3681da177e4SLinus Torvalds */ 3693ffe533cSAlexey Dobriyan void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info) 3701da177e4SLinus Torvalds { 371c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 3721da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 3730660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 37484427d53SYOSHIFUJI Hideaki struct sock *sk; 37584427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 376b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 3771da177e4SLinus Torvalds struct dst_entry *dst; 3781da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 3794c9483b2SDavid S. Miller struct flowi6 fl6; 3801da177e4SLinus Torvalds struct icmpv6_msg msg; 3811da177e4SLinus Torvalds int iif = 0; 3821da177e4SLinus Torvalds int addr_type = 0; 3831da177e4SLinus Torvalds int len; 384e651f03aSGerrit Renker int hlimit; 3851da177e4SLinus Torvalds int err = 0; 3861da177e4SLinus Torvalds 38727a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 38827a884dcSArnaldo Carvalho de Melo (skb->network_header + sizeof(*hdr)) > skb->tail) 3891da177e4SLinus Torvalds return; 3901da177e4SLinus Torvalds 3911da177e4SLinus Torvalds /* 3921da177e4SLinus Torvalds * Make sure we respect the rules 3931da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 3941da177e4SLinus Torvalds * Rule (e.1) is enforced by not using icmpv6_send 3951da177e4SLinus Torvalds * in any code that processes icmp errors. 3961da177e4SLinus Torvalds */ 3971da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 3981da177e4SLinus Torvalds 3999a43b709SBenjamin Thery if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0)) 4001da177e4SLinus Torvalds saddr = &hdr->daddr; 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds /* 4031da177e4SLinus Torvalds * Dest addr check 4041da177e4SLinus Torvalds */ 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) { 4071da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 4081da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 4091da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 4101da177e4SLinus Torvalds (opt_unrec(skb, info)))) 4111da177e4SLinus Torvalds return; 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds saddr = NULL; 4141da177e4SLinus Torvalds } 4151da177e4SLinus Torvalds 4161da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds /* 4191da177e4SLinus Torvalds * Source addr check 4201da177e4SLinus Torvalds */ 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds if (addr_type & IPV6_ADDR_LINKLOCAL) 4231da177e4SLinus Torvalds iif = skb->dev->ifindex; 4241da177e4SLinus Torvalds 4251da177e4SLinus Torvalds /* 4268de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 4278de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 4288de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 4298de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 4301da177e4SLinus Torvalds */ 4311da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 43264ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n"); 4331da177e4SLinus Torvalds return; 4341da177e4SLinus Torvalds } 4351da177e4SLinus Torvalds 4361da177e4SLinus Torvalds /* 4371da177e4SLinus Torvalds * Never answer to a ICMP packet. 4381da177e4SLinus Torvalds */ 4391da177e4SLinus Torvalds if (is_ineligible(skb)) { 44064ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n"); 4411da177e4SLinus Torvalds return; 4421da177e4SLinus Torvalds } 4431da177e4SLinus Torvalds 44479383236SMasahide NAKAMURA mip6_addr_swap(skb); 44579383236SMasahide NAKAMURA 4464c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 4474c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 4484e3fd7a0SAlexey Dobriyan fl6.daddr = hdr->saddr; 4491da177e4SLinus Torvalds if (saddr) 4504e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 4514c9483b2SDavid S. Miller fl6.flowi6_oif = iif; 4521958b856SDavid S. Miller fl6.fl6_icmp_type = type; 4531958b856SDavid S. Miller fl6.fl6_icmp_code = code; 4544c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 4551da177e4SLinus Torvalds 456fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 457fdc0bde9SDenis V. Lunev if (sk == NULL) 458405666dbSDenis V. Lunev return; 459fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 460405666dbSDenis V. Lunev 4614c9483b2SDavid S. Miller if (!icmpv6_xrlim_allow(sk, type, &fl6)) 4621da177e4SLinus Torvalds goto out; 4631da177e4SLinus Torvalds 4641da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 4651da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 4661da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 4671da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 4681da177e4SLinus Torvalds 4694c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 4704c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 471c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 472c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 4731da177e4SLinus Torvalds 4744c9483b2SDavid S. Miller dst = icmpv6_route_lookup(net, skb, sk, &fl6); 475b42835dbSDavid S. Miller if (IS_ERR(dst)) 4761da177e4SLinus Torvalds goto out; 4778de3351eSYOSHIFUJI Hideaki 4784c9483b2SDavid S. Miller if (ipv6_addr_is_multicast(&fl6.daddr)) 4791da177e4SLinus Torvalds hlimit = np->mcast_hops; 4801da177e4SLinus Torvalds else 4811da177e4SLinus Torvalds hlimit = np->hop_limit; 4821da177e4SLinus Torvalds if (hlimit < 0) 4836b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 4841da177e4SLinus Torvalds 4851da177e4SLinus Torvalds msg.skb = skb; 486bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 487763ecff1SYasuyuki Kozakai msg.type = type; 4881da177e4SLinus Torvalds 4891da177e4SLinus Torvalds len = skb->len - msg.offset; 4901da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); 4911da177e4SLinus Torvalds if (len < 0) { 49264ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n"); 4931da177e4SLinus Torvalds goto out_dst_release; 4941da177e4SLinus Torvalds } 4951da177e4SLinus Torvalds 496cfdf7647SEric Dumazet rcu_read_lock(); 497cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, 5001da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 501e651f03aSGerrit Renker sizeof(struct icmp6hdr), hlimit, 5024c9483b2SDavid S. Miller np->tclass, NULL, &fl6, (struct rt6_info*)dst, 50313b52cd4SBrian Haley MSG_DONTWAIT, np->dontfrag); 5041da177e4SLinus Torvalds if (err) { 50500d9d6a1SEric Dumazet ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS); 5061da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 507cfdf7647SEric Dumazet } else { 508cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 509cfdf7647SEric Dumazet len + sizeof(struct icmp6hdr)); 5101da177e4SLinus Torvalds } 511cfdf7647SEric Dumazet rcu_read_unlock(); 5121da177e4SLinus Torvalds out_dst_release: 5131da177e4SLinus Torvalds dst_release(dst); 5141da177e4SLinus Torvalds out: 515405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5161da177e4SLinus Torvalds } 5177159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_send); 5187159039aSYOSHIFUJI Hideaki 5191da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 5201da177e4SLinus Torvalds { 521c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 52284427d53SYOSHIFUJI Hideaki struct sock *sk; 5231da177e4SLinus Torvalds struct inet6_dev *idev; 52484427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 525b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 526cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 5271da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 5284c9483b2SDavid S. Miller struct flowi6 fl6; 5291da177e4SLinus Torvalds struct icmpv6_msg msg; 5301da177e4SLinus Torvalds struct dst_entry *dst; 5311da177e4SLinus Torvalds int err = 0; 5321da177e4SLinus Torvalds int hlimit; 5331da177e4SLinus Torvalds 5340660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 5351da177e4SLinus Torvalds 5361da177e4SLinus Torvalds if (!ipv6_unicast_destination(skb)) 5371da177e4SLinus Torvalds saddr = NULL; 5381da177e4SLinus Torvalds 5391da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 5401da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 5411da177e4SLinus Torvalds 5424c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 5434c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 5444e3fd7a0SAlexey Dobriyan fl6.daddr = ipv6_hdr(skb)->saddr; 5451da177e4SLinus Torvalds if (saddr) 5464e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 5474c9483b2SDavid S. Miller fl6.flowi6_oif = skb->dev->ifindex; 5481958b856SDavid S. Miller fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; 5494c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 5501da177e4SLinus Torvalds 551fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 552fdc0bde9SDenis V. Lunev if (sk == NULL) 553405666dbSDenis V. Lunev return; 554fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 555405666dbSDenis V. Lunev 5564c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 5574c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 558c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 559c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 5601da177e4SLinus Torvalds 5614c9483b2SDavid S. Miller err = ip6_dst_lookup(sk, &dst, &fl6); 5621da177e4SLinus Torvalds if (err) 5631da177e4SLinus Torvalds goto out; 5644c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); 565452edd59SDavid S. Miller if (IS_ERR(dst)) 566e104411bSPatrick McHardy goto out; 5671da177e4SLinus Torvalds 5684c9483b2SDavid S. Miller if (ipv6_addr_is_multicast(&fl6.daddr)) 5691da177e4SLinus Torvalds hlimit = np->mcast_hops; 5701da177e4SLinus Torvalds else 5711da177e4SLinus Torvalds hlimit = np->hop_limit; 5721da177e4SLinus Torvalds if (hlimit < 0) 5736b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 5741da177e4SLinus Torvalds 575cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 5761da177e4SLinus Torvalds 5771da177e4SLinus Torvalds msg.skb = skb; 5781da177e4SLinus Torvalds msg.offset = 0; 579763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 5801da177e4SLinus Torvalds 5811da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 5824c9483b2SDavid S. Miller sizeof(struct icmp6hdr), hlimit, np->tclass, NULL, &fl6, 58313b52cd4SBrian Haley (struct rt6_info*)dst, MSG_DONTWAIT, 58413b52cd4SBrian Haley np->dontfrag); 5851da177e4SLinus Torvalds 5861da177e4SLinus Torvalds if (err) { 58700d9d6a1SEric Dumazet ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS); 5881da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 589cfdf7647SEric Dumazet } else { 590cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 591cfdf7647SEric Dumazet skb->len + sizeof(struct icmp6hdr)); 5921da177e4SLinus Torvalds } 5931da177e4SLinus Torvalds dst_release(dst); 5941da177e4SLinus Torvalds out: 595405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5961da177e4SLinus Torvalds } 5971da177e4SLinus Torvalds 598d5fdd6baSBrian Haley static void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 5991da177e4SLinus Torvalds { 60041135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 6011da177e4SLinus Torvalds int inner_offset; 6021da177e4SLinus Torvalds int hash; 6031da177e4SLinus Torvalds u8 nexthdr; 60475f2811cSJesse Gross __be16 frag_off; 6051da177e4SLinus Torvalds 6061da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 6071da177e4SLinus Torvalds return; 6081da177e4SLinus Torvalds 6091da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 6101da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 6111da177e4SLinus Torvalds /* now skip over extension headers */ 61275f2811cSJesse Gross inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 61375f2811cSJesse Gross &nexthdr, &frag_off); 6141da177e4SLinus Torvalds if (inner_offset<0) 6151da177e4SLinus Torvalds return; 6161da177e4SLinus Torvalds } else { 6171da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 6181da177e4SLinus Torvalds } 6191da177e4SLinus Torvalds 6201da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 6211da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 6221da177e4SLinus Torvalds return; 6231da177e4SLinus Torvalds 6241da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 6251da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 6261da177e4SLinus Torvalds pmtu discovery. 6271da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 6281da177e4SLinus Torvalds --ANK (980726) 6291da177e4SLinus Torvalds */ 6301da177e4SLinus Torvalds 6311da177e4SLinus Torvalds hash = nexthdr & (MAX_INET_PROTOS - 1); 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds rcu_read_lock(); 6341da177e4SLinus Torvalds ipprot = rcu_dereference(inet6_protos[hash]); 6351da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 6361da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 6371da177e4SLinus Torvalds rcu_read_unlock(); 6381da177e4SLinus Torvalds 63969d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 6401da177e4SLinus Torvalds } 6411da177e4SLinus Torvalds 6421da177e4SLinus Torvalds /* 6431da177e4SLinus Torvalds * Handle icmp messages 6441da177e4SLinus Torvalds */ 6451da177e4SLinus Torvalds 646e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 6471da177e4SLinus Torvalds { 6481da177e4SLinus Torvalds struct net_device *dev = skb->dev; 6491da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 650b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 651b71d1d42SEric Dumazet const struct ipv6hdr *orig_hdr; 6521da177e4SLinus Torvalds struct icmp6hdr *hdr; 653d5fdd6baSBrian Haley u8 type; 6541da177e4SLinus Torvalds 655aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 656def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 6578b7817f3SHerbert Xu int nh; 6588b7817f3SHerbert Xu 659def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 660aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 661aebcf82cSHerbert Xu goto drop_no_count; 662aebcf82cSHerbert Xu 6638b7817f3SHerbert Xu if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(*orig_hdr))) 6648b7817f3SHerbert Xu goto drop_no_count; 6658b7817f3SHerbert Xu 6668b7817f3SHerbert Xu nh = skb_network_offset(skb); 6678b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 6688b7817f3SHerbert Xu 6698b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 6708b7817f3SHerbert Xu goto drop_no_count; 6718b7817f3SHerbert Xu 6728b7817f3SHerbert Xu skb_set_network_header(skb, nh); 6738b7817f3SHerbert Xu } 6748b7817f3SHerbert Xu 675e41b5368SDenis V. Lunev ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INMSGS); 6761da177e4SLinus Torvalds 6770660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 6780660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 6791da177e4SLinus Torvalds 6801da177e4SLinus Torvalds /* Perform checksum. */ 681fb286bb2SHerbert Xu switch (skb->ip_summed) { 68284fa7933SPatrick McHardy case CHECKSUM_COMPLETE: 683fb286bb2SHerbert Xu if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, 684fb286bb2SHerbert Xu skb->csum)) 685fb286bb2SHerbert Xu break; 686fb286bb2SHerbert Xu /* fall through */ 687fb286bb2SHerbert Xu case CHECKSUM_NONE: 688868c86bcSAl Viro skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len, 689868c86bcSAl Viro IPPROTO_ICMPV6, 0)); 690fb286bb2SHerbert Xu if (__skb_checksum_complete(skb)) { 6915b095d98SHarvey Harrison LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [%pI6 > %pI6]\n", 6920c6ce78aSHarvey Harrison saddr, daddr); 6931da177e4SLinus Torvalds goto discard_it; 6941da177e4SLinus Torvalds } 6951da177e4SLinus Torvalds } 6961da177e4SLinus Torvalds 6978cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 6988cf22943SHerbert Xu goto discard_it; 6991da177e4SLinus Torvalds 700cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 7011da177e4SLinus Torvalds 7021da177e4SLinus Torvalds type = hdr->icmp6_type; 7031da177e4SLinus Torvalds 70455d43808SDenis V. Lunev ICMP6MSGIN_INC_STATS_BH(dev_net(dev), idev, type); 7051da177e4SLinus Torvalds 7061da177e4SLinus Torvalds switch (type) { 7071da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 7081da177e4SLinus Torvalds icmpv6_echo_reply(skb); 7091da177e4SLinus Torvalds break; 7101da177e4SLinus Torvalds 7111da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 7121da177e4SLinus Torvalds /* we couldn't care less */ 7131da177e4SLinus Torvalds break; 7141da177e4SLinus Torvalds 7151da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 7161da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 7171da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 7181da177e4SLinus Torvalds destination cache will allow to solve this problem 7191da177e4SLinus Torvalds --ANK (980726) 7201da177e4SLinus Torvalds */ 7211da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 7221da177e4SLinus Torvalds goto discard_it; 723cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 7241da177e4SLinus Torvalds orig_hdr = (struct ipv6hdr *) (hdr + 1); 7251da177e4SLinus Torvalds rt6_pmtu_discovery(&orig_hdr->daddr, &orig_hdr->saddr, dev, 7261da177e4SLinus Torvalds ntohl(hdr->icmp6_mtu)); 7271da177e4SLinus Torvalds 7281da177e4SLinus Torvalds /* 7291da177e4SLinus Torvalds * Drop through to notify 7301da177e4SLinus Torvalds */ 7311da177e4SLinus Torvalds 7321da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 7331da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 7341da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 7351da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7361da177e4SLinus Torvalds break; 7371da177e4SLinus Torvalds 7381da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 7391da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 7401da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 7411da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 7421da177e4SLinus Torvalds case NDISC_REDIRECT: 7431da177e4SLinus Torvalds ndisc_rcv(skb); 7441da177e4SLinus Torvalds break; 7451da177e4SLinus Torvalds 7461da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 7471da177e4SLinus Torvalds igmp6_event_query(skb); 7481da177e4SLinus Torvalds break; 7491da177e4SLinus Torvalds 7501da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 7511da177e4SLinus Torvalds igmp6_event_report(skb); 7521da177e4SLinus Torvalds break; 7531da177e4SLinus Torvalds 7541da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 7551da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 7561da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 7571da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 7581da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 7591da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 7601da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 7611da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 7621da177e4SLinus Torvalds break; 7631da177e4SLinus Torvalds 7641da177e4SLinus Torvalds default: 76564ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n"); 7661da177e4SLinus Torvalds 7671da177e4SLinus Torvalds /* informational */ 7681da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 7691da177e4SLinus Torvalds break; 7701da177e4SLinus Torvalds 7711da177e4SLinus Torvalds /* 7721da177e4SLinus Torvalds * error of unknown type. 7731da177e4SLinus Torvalds * must pass to upper level 7741da177e4SLinus Torvalds */ 7751da177e4SLinus Torvalds 7761da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7773ff50b79SStephen Hemminger } 7783ff50b79SStephen Hemminger 7791da177e4SLinus Torvalds kfree_skb(skb); 7801da177e4SLinus Torvalds return 0; 7811da177e4SLinus Torvalds 7821da177e4SLinus Torvalds discard_it: 783e41b5368SDenis V. Lunev ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INERRORS); 7848b7817f3SHerbert Xu drop_no_count: 7851da177e4SLinus Torvalds kfree_skb(skb); 7861da177e4SLinus Torvalds return 0; 7871da177e4SLinus Torvalds } 7881da177e4SLinus Torvalds 7894c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, 79095e41e93SYOSHIFUJI Hideaki u8 type, 79195e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 79295e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 79395e41e93SYOSHIFUJI Hideaki int oif) 79495e41e93SYOSHIFUJI Hideaki { 7954c9483b2SDavid S. Miller memset(fl6, 0, sizeof(*fl6)); 7964e3fd7a0SAlexey Dobriyan fl6->saddr = *saddr; 7974e3fd7a0SAlexey Dobriyan fl6->daddr = *daddr; 7984c9483b2SDavid S. Miller fl6->flowi6_proto = IPPROTO_ICMPV6; 7991958b856SDavid S. Miller fl6->fl6_icmp_type = type; 8001958b856SDavid S. Miller fl6->fl6_icmp_code = 0; 8014c9483b2SDavid S. Miller fl6->flowi6_oif = oif; 8024c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); 80395e41e93SYOSHIFUJI Hideaki } 80495e41e93SYOSHIFUJI Hideaki 805640c41c7SIngo Molnar /* 806b7e729c4SDenis V. Lunev * Special lock-class for __icmpv6_sk: 807640c41c7SIngo Molnar */ 808640c41c7SIngo Molnar static struct lock_class_key icmpv6_socket_sk_dst_lock_key; 809640c41c7SIngo Molnar 81098c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 8111da177e4SLinus Torvalds { 8121da177e4SLinus Torvalds struct sock *sk; 8131da177e4SLinus Torvalds int err, i, j; 8141da177e4SLinus Torvalds 81598c6d1b2SDenis V. Lunev net->ipv6.icmp_sk = 81698c6d1b2SDenis V. Lunev kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); 81798c6d1b2SDenis V. Lunev if (net->ipv6.icmp_sk == NULL) 81879c91159SDenis V. Lunev return -ENOMEM; 81979c91159SDenis V. Lunev 8206f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8211ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 8221ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 8231da177e4SLinus Torvalds if (err < 0) { 8241da177e4SLinus Torvalds printk(KERN_ERR 8251da177e4SLinus Torvalds "Failed to initialize the ICMP6 control socket " 8261da177e4SLinus Torvalds "(err %d).\n", 8271da177e4SLinus Torvalds err); 8281da177e4SLinus Torvalds goto fail; 8291da177e4SLinus Torvalds } 8301da177e4SLinus Torvalds 8311ed8516fSDenis V. Lunev net->ipv6.icmp_sk[i] = sk; 8325c8cafd6SDenis V. Lunev 833640c41c7SIngo Molnar /* 834640c41c7SIngo Molnar * Split off their lock-class, because sk->sk_dst_lock 835640c41c7SIngo Molnar * gets used from softirqs, which is safe for 836b7e729c4SDenis V. Lunev * __icmpv6_sk (because those never get directly used 837640c41c7SIngo Molnar * via userspace syscalls), but unsafe for normal sockets. 838640c41c7SIngo Molnar */ 839640c41c7SIngo Molnar lockdep_set_class(&sk->sk_dst_lock, 840640c41c7SIngo Molnar &icmpv6_socket_sk_dst_lock_key); 8411da177e4SLinus Torvalds 8421da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 8431da177e4SLinus Torvalds * sk_buff struct overhead. 8441da177e4SLinus Torvalds */ 84587fb4b7bSEric Dumazet sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); 8461da177e4SLinus Torvalds } 8471da177e4SLinus Torvalds return 0; 8481da177e4SLinus Torvalds 8491da177e4SLinus Torvalds fail: 8505c8cafd6SDenis V. Lunev for (j = 0; j < i; j++) 8511ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); 85298c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 8531da177e4SLinus Torvalds return err; 8541da177e4SLinus Torvalds } 8551da177e4SLinus Torvalds 85698c6d1b2SDenis V. Lunev static void __net_exit icmpv6_sk_exit(struct net *net) 8571da177e4SLinus Torvalds { 8581da177e4SLinus Torvalds int i; 8591da177e4SLinus Torvalds 8606f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8611ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); 8621da177e4SLinus Torvalds } 86398c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 86498c6d1b2SDenis V. Lunev } 86598c6d1b2SDenis V. Lunev 8668ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 86798c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 86898c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 86998c6d1b2SDenis V. Lunev }; 87098c6d1b2SDenis V. Lunev 87198c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 87298c6d1b2SDenis V. Lunev { 87398c6d1b2SDenis V. Lunev int err; 87498c6d1b2SDenis V. Lunev 87598c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 87698c6d1b2SDenis V. Lunev if (err < 0) 87798c6d1b2SDenis V. Lunev return err; 87898c6d1b2SDenis V. Lunev 87998c6d1b2SDenis V. Lunev err = -EAGAIN; 88098c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 88198c6d1b2SDenis V. Lunev goto fail; 88298c6d1b2SDenis V. Lunev return 0; 88398c6d1b2SDenis V. Lunev 88498c6d1b2SDenis V. Lunev fail: 88598c6d1b2SDenis V. Lunev printk(KERN_ERR "Failed to register ICMP6 protocol\n"); 88698c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 88798c6d1b2SDenis V. Lunev return err; 88898c6d1b2SDenis V. Lunev } 88998c6d1b2SDenis V. Lunev 8908ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 89198c6d1b2SDenis V. Lunev { 89298c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 8931da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 8941da177e4SLinus Torvalds } 8951da177e4SLinus Torvalds 89698c6d1b2SDenis V. Lunev 8979b5b5cffSArjan van de Ven static const struct icmp6_err { 8981da177e4SLinus Torvalds int err; 8991da177e4SLinus Torvalds int fatal; 9001da177e4SLinus Torvalds } tab_unreach[] = { 9011da177e4SLinus Torvalds { /* NOROUTE */ 9021da177e4SLinus Torvalds .err = ENETUNREACH, 9031da177e4SLinus Torvalds .fatal = 0, 9041da177e4SLinus Torvalds }, 9051da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 9061da177e4SLinus Torvalds .err = EACCES, 9071da177e4SLinus Torvalds .fatal = 1, 9081da177e4SLinus Torvalds }, 9091da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 9101da177e4SLinus Torvalds .err = EHOSTUNREACH, 9111da177e4SLinus Torvalds .fatal = 0, 9121da177e4SLinus Torvalds }, 9131da177e4SLinus Torvalds { /* ADDR_UNREACH */ 9141da177e4SLinus Torvalds .err = EHOSTUNREACH, 9151da177e4SLinus Torvalds .fatal = 0, 9161da177e4SLinus Torvalds }, 9171da177e4SLinus Torvalds { /* PORT_UNREACH */ 9181da177e4SLinus Torvalds .err = ECONNREFUSED, 9191da177e4SLinus Torvalds .fatal = 1, 9201da177e4SLinus Torvalds }, 9211da177e4SLinus Torvalds }; 9221da177e4SLinus Torvalds 923d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 9241da177e4SLinus Torvalds { 9251da177e4SLinus Torvalds int fatal = 0; 9261da177e4SLinus Torvalds 9271da177e4SLinus Torvalds *err = EPROTO; 9281da177e4SLinus Torvalds 9291da177e4SLinus Torvalds switch (type) { 9301da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 9311da177e4SLinus Torvalds fatal = 1; 9321da177e4SLinus Torvalds if (code <= ICMPV6_PORT_UNREACH) { 9331da177e4SLinus Torvalds *err = tab_unreach[code].err; 9341da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 9351da177e4SLinus Torvalds } 9361da177e4SLinus Torvalds break; 9371da177e4SLinus Torvalds 9381da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 9391da177e4SLinus Torvalds *err = EMSGSIZE; 9401da177e4SLinus Torvalds break; 9411da177e4SLinus Torvalds 9421da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 9431da177e4SLinus Torvalds *err = EPROTO; 9441da177e4SLinus Torvalds fatal = 1; 9451da177e4SLinus Torvalds break; 9461da177e4SLinus Torvalds 9471da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 9481da177e4SLinus Torvalds *err = EHOSTUNREACH; 9491da177e4SLinus Torvalds break; 9503ff50b79SStephen Hemminger } 9511da177e4SLinus Torvalds 9521da177e4SLinus Torvalds return fatal; 9531da177e4SLinus Torvalds } 9541da177e4SLinus Torvalds 9557159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 9567159039aSYOSHIFUJI Hideaki 9571da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 958760f2d01SDaniel Lezcano ctl_table ipv6_icmp_table_template[] = { 9591da177e4SLinus Torvalds { 9601da177e4SLinus Torvalds .procname = "ratelimit", 96141a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 9621da177e4SLinus Torvalds .maxlen = sizeof(int), 9631da177e4SLinus Torvalds .mode = 0644, 9646d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 9651da177e4SLinus Torvalds }, 966f8572d8fSEric W. Biederman { }, 9671da177e4SLinus Torvalds }; 968760f2d01SDaniel Lezcano 9692c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 970760f2d01SDaniel Lezcano { 971760f2d01SDaniel Lezcano struct ctl_table *table; 972760f2d01SDaniel Lezcano 973760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 974760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 975760f2d01SDaniel Lezcano GFP_KERNEL); 9765ee09105SYOSHIFUJI Hideaki 9775ee09105SYOSHIFUJI Hideaki if (table) 9785ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 9795ee09105SYOSHIFUJI Hideaki 980760f2d01SDaniel Lezcano return table; 981760f2d01SDaniel Lezcano } 9821da177e4SLinus Torvalds #endif 9831da177e4SLinus Torvalds 984