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> 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds #include <asm/uaccess.h> 721da177e4SLinus Torvalds 731da177e4SLinus Torvalds /* 741da177e4SLinus Torvalds * The ICMP socket(s). This is the most convenient way to flow control 751da177e4SLinus Torvalds * our ICMP output as well as maintain a clean interface throughout 761da177e4SLinus Torvalds * all layers. All Socketless IP sends will soon be gone. 771da177e4SLinus Torvalds * 781da177e4SLinus Torvalds * On SMP we have one ICMP socket per-cpu. 791da177e4SLinus Torvalds */ 8098c6d1b2SDenis V. Lunev static inline struct sock *icmpv6_sk(struct net *net) 8198c6d1b2SDenis V. Lunev { 8298c6d1b2SDenis V. Lunev return net->ipv6.icmp_sk[smp_processor_id()]; 8398c6d1b2SDenis V. Lunev } 841da177e4SLinus Torvalds 856f809da2SSteffen Klassert static void icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 866f809da2SSteffen Klassert u8 type, u8 code, int offset, __be32 info) 876f809da2SSteffen Klassert { 886d0bfe22SLorenzo Colitti /* icmpv6_notify checks 8 bytes can be pulled, icmp6hdr is 8 bytes */ 896d0bfe22SLorenzo Colitti struct icmp6hdr *icmp6 = (struct icmp6hdr *) (skb->data + offset); 906f809da2SSteffen Klassert struct net *net = dev_net(skb->dev); 916f809da2SSteffen Klassert 926f809da2SSteffen Klassert if (type == ICMPV6_PKT_TOOBIG) 936f809da2SSteffen Klassert ip6_update_pmtu(skb, net, info, 0, 0); 946f809da2SSteffen Klassert else if (type == NDISC_REDIRECT) 956f809da2SSteffen Klassert ip6_redirect(skb, net, 0, 0); 966d0bfe22SLorenzo Colitti 976d0bfe22SLorenzo Colitti if (!(type & ICMPV6_INFOMSG_MASK)) 986d0bfe22SLorenzo Colitti if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST) 996d0bfe22SLorenzo Colitti ping_err(skb, offset, info); 1006f809da2SSteffen Klassert } 1016f809da2SSteffen Klassert 102e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb); 1031da177e4SLinus Torvalds 10441135cc8SAlexey Dobriyan static const struct inet6_protocol icmpv6_protocol = { 1051da177e4SLinus Torvalds .handler = icmpv6_rcv, 1066f809da2SSteffen Klassert .err_handler = icmpv6_err, 1078b7817f3SHerbert Xu .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1081da177e4SLinus Torvalds }; 1091da177e4SLinus Torvalds 110fdc0bde9SDenis V. Lunev static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) 1111da177e4SLinus Torvalds { 112fdc0bde9SDenis V. Lunev struct sock *sk; 113fdc0bde9SDenis V. Lunev 1141da177e4SLinus Torvalds local_bh_disable(); 1151da177e4SLinus Torvalds 116fdc0bde9SDenis V. Lunev sk = icmpv6_sk(net); 117405666dbSDenis V. Lunev if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { 1181da177e4SLinus Torvalds /* This can happen if the output path (f.e. SIT or 1191da177e4SLinus Torvalds * ip6ip6 tunnel) signals dst_link_failure() for an 1201da177e4SLinus Torvalds * outgoing ICMP6 packet. 1211da177e4SLinus Torvalds */ 1221da177e4SLinus Torvalds local_bh_enable(); 123fdc0bde9SDenis V. Lunev return NULL; 1241da177e4SLinus Torvalds } 125fdc0bde9SDenis V. Lunev return sk; 1261da177e4SLinus Torvalds } 1271da177e4SLinus Torvalds 128405666dbSDenis V. Lunev static __inline__ void icmpv6_xmit_unlock(struct sock *sk) 1291da177e4SLinus Torvalds { 130405666dbSDenis V. Lunev spin_unlock_bh(&sk->sk_lock.slock); 1311da177e4SLinus Torvalds } 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvalds /* 1341da177e4SLinus Torvalds * Figure out, may we reply to this packet with icmp error. 1351da177e4SLinus Torvalds * 1361da177e4SLinus Torvalds * We do not reply, if: 1371da177e4SLinus Torvalds * - it was icmp error message. 1381da177e4SLinus Torvalds * - it is truncated, so that it is known, that protocol is ICMPV6 1391da177e4SLinus Torvalds * (i.e. in the middle of some exthdr) 1401da177e4SLinus Torvalds * 1411da177e4SLinus Torvalds * --ANK (980726) 1421da177e4SLinus Torvalds */ 1431da177e4SLinus Torvalds 144a50feda5SEric Dumazet static bool is_ineligible(const struct sk_buff *skb) 1451da177e4SLinus Torvalds { 1460660e03fSArnaldo Carvalho de Melo int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; 1471da177e4SLinus Torvalds int len = skb->len - ptr; 1480660e03fSArnaldo Carvalho de Melo __u8 nexthdr = ipv6_hdr(skb)->nexthdr; 14975f2811cSJesse Gross __be16 frag_off; 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds if (len < 0) 152a50feda5SEric Dumazet return true; 1531da177e4SLinus Torvalds 15475f2811cSJesse Gross ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off); 1551da177e4SLinus Torvalds if (ptr < 0) 156a50feda5SEric Dumazet return false; 1571da177e4SLinus Torvalds if (nexthdr == IPPROTO_ICMPV6) { 1581da177e4SLinus Torvalds u8 _type, *tp; 1591da177e4SLinus Torvalds tp = skb_header_pointer(skb, 1601da177e4SLinus Torvalds ptr+offsetof(struct icmp6hdr, icmp6_type), 1611da177e4SLinus Torvalds sizeof(_type), &_type); 1621da177e4SLinus Torvalds if (tp == NULL || 1631da177e4SLinus Torvalds !(*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 */ 17292d86829SDavid S. Miller static inline bool icmpv6_xrlim_allow(struct sock *sk, u8 type, 1734c9483b2SDavid S. Miller struct flowi6 *fl6) 1741da177e4SLinus Torvalds { 1751da177e4SLinus Torvalds struct dst_entry *dst; 1763b1e0a65SYOSHIFUJI Hideaki struct net *net = sock_net(sk); 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; 201fbfe95a4SDavid S. Miller struct inet_peer *peer; 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds /* Give more bandwidth to wider prefixes. */ 2041da177e4SLinus Torvalds if (rt->rt6i_dst.plen < 128) 2051da177e4SLinus Torvalds tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 2061da177e4SLinus Torvalds 2071d861aa4SDavid S. Miller peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1); 208fbfe95a4SDavid S. Miller res = inet_peer_xrlim_allow(peer, tmo); 2091d861aa4SDavid S. Miller if (peer) 2101d861aa4SDavid S. Miller inet_putpeer(peer); 2111da177e4SLinus Torvalds } 2121da177e4SLinus Torvalds dst_release(dst); 2131da177e4SLinus Torvalds return res; 2141da177e4SLinus Torvalds } 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds /* 2171da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2181da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2191da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2201da177e4SLinus Torvalds * highest-order two bits set to 10 2211da177e4SLinus Torvalds */ 2221da177e4SLinus Torvalds 223a50feda5SEric Dumazet static bool opt_unrec(struct sk_buff *skb, __u32 offset) 2241da177e4SLinus Torvalds { 2251da177e4SLinus Torvalds u8 _optval, *op; 2261da177e4SLinus Torvalds 227bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2281da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 2291da177e4SLinus Torvalds if (op == NULL) 230a50feda5SEric Dumazet return true; 2311da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2321da177e4SLinus Torvalds } 2331da177e4SLinus Torvalds 2346d0bfe22SLorenzo Colitti int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 2356d0bfe22SLorenzo Colitti struct icmp6hdr *thdr, int len) 2361da177e4SLinus Torvalds { 2371da177e4SLinus Torvalds struct sk_buff *skb; 2381da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2391da177e4SLinus Torvalds int err = 0; 2401da177e4SLinus Torvalds 2411da177e4SLinus Torvalds if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 2421da177e4SLinus Torvalds goto out; 2431da177e4SLinus Torvalds 244cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2451da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2461da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2471da177e4SLinus Torvalds 2481da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 24907f0757aSJoe Perches skb->csum = csum_partial(icmp6h, 2501da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2514c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2524c9483b2SDavid S. Miller &fl6->daddr, 2534c9483b2SDavid S. Miller len, fl6->flowi6_proto, 2541da177e4SLinus Torvalds skb->csum); 2551da177e4SLinus Torvalds } else { 256868c86bcSAl Viro __wsum tmp_csum = 0; 2571da177e4SLinus Torvalds 2581da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2591da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2601da177e4SLinus Torvalds } 2611da177e4SLinus Torvalds 26207f0757aSJoe Perches tmp_csum = csum_partial(icmp6h, 2631da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 2644c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2654c9483b2SDavid S. Miller &fl6->daddr, 2664c9483b2SDavid S. Miller len, fl6->flowi6_proto, 267868c86bcSAl Viro tmp_csum); 2681da177e4SLinus Torvalds } 2691da177e4SLinus Torvalds ip6_push_pending_frames(sk); 2701da177e4SLinus Torvalds out: 2711da177e4SLinus Torvalds return err; 2721da177e4SLinus Torvalds } 2731da177e4SLinus Torvalds 2741da177e4SLinus Torvalds struct icmpv6_msg { 2751da177e4SLinus Torvalds struct sk_buff *skb; 2761da177e4SLinus Torvalds int offset; 277763ecff1SYasuyuki Kozakai uint8_t type; 2781da177e4SLinus Torvalds }; 2791da177e4SLinus Torvalds 2801da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 2811da177e4SLinus Torvalds { 2821da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 2831da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 2845f92a738SAl Viro __wsum csum = 0; 2851da177e4SLinus Torvalds 2861da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 2871da177e4SLinus Torvalds to, len, csum); 2881da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 289763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 290763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 2911da177e4SLinus Torvalds return 0; 2921da177e4SLinus Torvalds } 2931da177e4SLinus Torvalds 29407a93626SAmerigo Wang #if IS_ENABLED(CONFIG_IPV6_MIP6) 29579383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 29679383236SMasahide NAKAMURA { 2970660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 29879383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 29979383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 30079383236SMasahide NAKAMURA struct in6_addr tmp; 30179383236SMasahide NAKAMURA int off; 30279383236SMasahide NAKAMURA 30379383236SMasahide NAKAMURA if (opt->dsthao) { 30479383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 30579383236SMasahide NAKAMURA if (likely(off >= 0)) { 306d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 307d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 3084e3fd7a0SAlexey Dobriyan tmp = iph->saddr; 3094e3fd7a0SAlexey Dobriyan iph->saddr = hao->addr; 3104e3fd7a0SAlexey Dobriyan hao->addr = tmp; 31179383236SMasahide NAKAMURA } 31279383236SMasahide NAKAMURA } 31379383236SMasahide NAKAMURA } 31479383236SMasahide NAKAMURA #else 31579383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 31679383236SMasahide NAKAMURA #endif 31779383236SMasahide NAKAMURA 3186d0bfe22SLorenzo Colitti struct dst_entry *icmpv6_route_lookup(struct net *net, struct sk_buff *skb, 3194c9483b2SDavid S. Miller struct sock *sk, struct flowi6 *fl6) 320b42835dbSDavid S. Miller { 321b42835dbSDavid S. Miller struct dst_entry *dst, *dst2; 3224c9483b2SDavid S. Miller struct flowi6 fl2; 323b42835dbSDavid S. Miller int err; 324b42835dbSDavid S. Miller 3254c9483b2SDavid S. Miller err = ip6_dst_lookup(sk, &dst, fl6); 326b42835dbSDavid S. Miller if (err) 327b42835dbSDavid S. Miller return ERR_PTR(err); 328b42835dbSDavid S. Miller 329b42835dbSDavid S. Miller /* 330b42835dbSDavid S. Miller * We won't send icmp if the destination is known 331b42835dbSDavid S. Miller * anycast. 332b42835dbSDavid S. Miller */ 333b42835dbSDavid S. Miller if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { 3345f5624cfSPravin B Shelar LIMIT_NETDEBUG(KERN_DEBUG "icmp6_send: acast source\n"); 335b42835dbSDavid S. Miller dst_release(dst); 336b42835dbSDavid S. Miller return ERR_PTR(-EINVAL); 337b42835dbSDavid S. Miller } 338b42835dbSDavid S. Miller 339b42835dbSDavid S. Miller /* No need to clone since we're just using its address. */ 340b42835dbSDavid S. Miller dst2 = dst; 341b42835dbSDavid S. Miller 3424c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); 343452edd59SDavid S. Miller if (!IS_ERR(dst)) { 344b42835dbSDavid S. Miller if (dst != dst2) 345b42835dbSDavid S. Miller return dst; 346452edd59SDavid S. Miller } else { 347452edd59SDavid S. Miller if (PTR_ERR(dst) == -EPERM) 348b42835dbSDavid S. Miller dst = NULL; 349452edd59SDavid S. Miller else 350452edd59SDavid S. Miller return dst; 351b42835dbSDavid S. Miller } 352b42835dbSDavid S. Miller 3534c9483b2SDavid S. Miller err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); 354b42835dbSDavid S. Miller if (err) 355b42835dbSDavid S. Miller goto relookup_failed; 356b42835dbSDavid S. Miller 357b42835dbSDavid S. Miller err = ip6_dst_lookup(sk, &dst2, &fl2); 358b42835dbSDavid S. Miller if (err) 359b42835dbSDavid S. Miller goto relookup_failed; 360b42835dbSDavid S. Miller 3614c9483b2SDavid S. Miller dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); 362452edd59SDavid S. Miller if (!IS_ERR(dst2)) { 363b42835dbSDavid S. Miller dst_release(dst); 364b42835dbSDavid S. Miller dst = dst2; 365452edd59SDavid S. Miller } else { 366452edd59SDavid S. Miller err = PTR_ERR(dst2); 367452edd59SDavid S. Miller if (err == -EPERM) { 368b42835dbSDavid S. Miller dst_release(dst); 369452edd59SDavid S. Miller return dst2; 370452edd59SDavid S. Miller } else 371b42835dbSDavid S. Miller goto relookup_failed; 372b42835dbSDavid S. Miller } 373b42835dbSDavid S. Miller 374b42835dbSDavid S. Miller relookup_failed: 375b42835dbSDavid S. Miller if (dst) 376b42835dbSDavid S. Miller return dst; 377b42835dbSDavid S. Miller return ERR_PTR(err); 378b42835dbSDavid S. Miller } 379b42835dbSDavid S. Miller 3801da177e4SLinus Torvalds /* 3811da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 3821da177e4SLinus Torvalds */ 3835f5624cfSPravin B Shelar static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info) 3841da177e4SLinus Torvalds { 385c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 3861da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 3870660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 38884427d53SYOSHIFUJI Hideaki struct sock *sk; 38984427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 390b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 3911da177e4SLinus Torvalds struct dst_entry *dst; 3921da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 3934c9483b2SDavid S. Miller struct flowi6 fl6; 3941da177e4SLinus Torvalds struct icmpv6_msg msg; 3951da177e4SLinus Torvalds int iif = 0; 3961da177e4SLinus Torvalds int addr_type = 0; 3971da177e4SLinus Torvalds int len; 398e651f03aSGerrit Renker int hlimit; 3991da177e4SLinus Torvalds int err = 0; 4001da177e4SLinus Torvalds 40127a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 40227a884dcSArnaldo Carvalho de Melo (skb->network_header + sizeof(*hdr)) > skb->tail) 4031da177e4SLinus Torvalds return; 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds /* 4061da177e4SLinus Torvalds * Make sure we respect the rules 4071da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 4085f5624cfSPravin B Shelar * Rule (e.1) is enforced by not using icmp6_send 4091da177e4SLinus Torvalds * in any code that processes icmp errors. 4101da177e4SLinus Torvalds */ 4111da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 4121da177e4SLinus Torvalds 4139a43b709SBenjamin Thery if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0)) 4141da177e4SLinus Torvalds saddr = &hdr->daddr; 4151da177e4SLinus Torvalds 4161da177e4SLinus Torvalds /* 4171da177e4SLinus Torvalds * Dest addr check 4181da177e4SLinus Torvalds */ 4191da177e4SLinus Torvalds 4201da177e4SLinus Torvalds if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) { 4211da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 4221da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 4231da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 4241da177e4SLinus Torvalds (opt_unrec(skb, info)))) 4251da177e4SLinus Torvalds return; 4261da177e4SLinus Torvalds 4271da177e4SLinus Torvalds saddr = NULL; 4281da177e4SLinus Torvalds } 4291da177e4SLinus Torvalds 4301da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 4311da177e4SLinus Torvalds 4321da177e4SLinus Torvalds /* 4331da177e4SLinus Torvalds * Source addr check 4341da177e4SLinus Torvalds */ 4351da177e4SLinus Torvalds 436842df073SHannes Frederic Sowa if (__ipv6_addr_needs_scope_id(addr_type)) 4371da177e4SLinus Torvalds iif = skb->dev->ifindex; 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds /* 4408de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 4418de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 4428de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 4438de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 4441da177e4SLinus Torvalds */ 4451da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 4465f5624cfSPravin B Shelar LIMIT_NETDEBUG(KERN_DEBUG "icmp6_send: addr_any/mcast source\n"); 4471da177e4SLinus Torvalds return; 4481da177e4SLinus Torvalds } 4491da177e4SLinus Torvalds 4501da177e4SLinus Torvalds /* 4511da177e4SLinus Torvalds * Never answer to a ICMP packet. 4521da177e4SLinus Torvalds */ 4531da177e4SLinus Torvalds if (is_ineligible(skb)) { 4545f5624cfSPravin B Shelar LIMIT_NETDEBUG(KERN_DEBUG "icmp6_send: no reply to icmp error\n"); 4551da177e4SLinus Torvalds return; 4561da177e4SLinus Torvalds } 4571da177e4SLinus Torvalds 45879383236SMasahide NAKAMURA mip6_addr_swap(skb); 45979383236SMasahide NAKAMURA 4604c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 4614c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 4624e3fd7a0SAlexey Dobriyan fl6.daddr = hdr->saddr; 4631da177e4SLinus Torvalds if (saddr) 4644e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 4654c9483b2SDavid S. Miller fl6.flowi6_oif = iif; 4661958b856SDavid S. Miller fl6.fl6_icmp_type = type; 4671958b856SDavid S. Miller fl6.fl6_icmp_code = code; 4684c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 4691da177e4SLinus Torvalds 470fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 471fdc0bde9SDenis V. Lunev if (sk == NULL) 472405666dbSDenis V. Lunev return; 473fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 474405666dbSDenis V. Lunev 4754c9483b2SDavid S. Miller if (!icmpv6_xrlim_allow(sk, type, &fl6)) 4761da177e4SLinus Torvalds goto out; 4771da177e4SLinus Torvalds 4781da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 4791da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 4801da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 4811da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 4821da177e4SLinus Torvalds 4834c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 4844c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 485c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 486c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 4871da177e4SLinus Torvalds 4884c9483b2SDavid S. Miller dst = icmpv6_route_lookup(net, skb, sk, &fl6); 489b42835dbSDavid S. Miller if (IS_ERR(dst)) 4901da177e4SLinus Torvalds goto out; 4918de3351eSYOSHIFUJI Hideaki 4924c9483b2SDavid S. Miller if (ipv6_addr_is_multicast(&fl6.daddr)) 4931da177e4SLinus Torvalds hlimit = np->mcast_hops; 4941da177e4SLinus Torvalds else 4951da177e4SLinus Torvalds hlimit = np->hop_limit; 4961da177e4SLinus Torvalds if (hlimit < 0) 4976b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds msg.skb = skb; 500bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 501763ecff1SYasuyuki Kozakai msg.type = type; 5021da177e4SLinus Torvalds 5031da177e4SLinus Torvalds len = skb->len - msg.offset; 5041da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); 5051da177e4SLinus Torvalds if (len < 0) { 50664ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n"); 5071da177e4SLinus Torvalds goto out_dst_release; 5081da177e4SLinus Torvalds } 5091da177e4SLinus Torvalds 510cfdf7647SEric Dumazet rcu_read_lock(); 511cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 5121da177e4SLinus Torvalds 5131da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, 5141da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 515e651f03aSGerrit Renker sizeof(struct icmp6hdr), hlimit, 5164c9483b2SDavid S. Miller np->tclass, NULL, &fl6, (struct rt6_info *)dst, 51713b52cd4SBrian Haley MSG_DONTWAIT, np->dontfrag); 5181da177e4SLinus Torvalds if (err) { 51900d9d6a1SEric Dumazet ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS); 5201da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 521cfdf7647SEric Dumazet } else { 522cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 523cfdf7647SEric Dumazet len + sizeof(struct icmp6hdr)); 5241da177e4SLinus Torvalds } 525cfdf7647SEric Dumazet rcu_read_unlock(); 5261da177e4SLinus Torvalds out_dst_release: 5271da177e4SLinus Torvalds dst_release(dst); 5281da177e4SLinus Torvalds out: 529405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5301da177e4SLinus Torvalds } 5315f5624cfSPravin B Shelar 5325f5624cfSPravin B Shelar /* Slightly more convenient version of icmp6_send. 5335f5624cfSPravin B Shelar */ 5345f5624cfSPravin B Shelar void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) 5355f5624cfSPravin B Shelar { 5365f5624cfSPravin B Shelar icmp6_send(skb, ICMPV6_PARAMPROB, code, pos); 5375f5624cfSPravin B Shelar kfree_skb(skb); 5385f5624cfSPravin B Shelar } 5397159039aSYOSHIFUJI Hideaki 5401da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 5411da177e4SLinus Torvalds { 542c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 54384427d53SYOSHIFUJI Hideaki struct sock *sk; 5441da177e4SLinus Torvalds struct inet6_dev *idev; 54584427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 546b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 547cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 5481da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 5494c9483b2SDavid S. Miller struct flowi6 fl6; 5501da177e4SLinus Torvalds struct icmpv6_msg msg; 5511da177e4SLinus Torvalds struct dst_entry *dst; 5521da177e4SLinus Torvalds int err = 0; 5531da177e4SLinus Torvalds int hlimit; 5541da177e4SLinus Torvalds 5550660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 5561da177e4SLinus Torvalds 5571da177e4SLinus Torvalds if (!ipv6_unicast_destination(skb)) 5581da177e4SLinus Torvalds saddr = NULL; 5591da177e4SLinus Torvalds 5601da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 5611da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 5621da177e4SLinus Torvalds 5634c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 5644c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 5654e3fd7a0SAlexey Dobriyan fl6.daddr = ipv6_hdr(skb)->saddr; 5661da177e4SLinus Torvalds if (saddr) 5674e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 5684c9483b2SDavid S. Miller fl6.flowi6_oif = skb->dev->ifindex; 5691958b856SDavid S. Miller fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; 5704c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 5711da177e4SLinus Torvalds 572fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 573fdc0bde9SDenis V. Lunev if (sk == NULL) 574405666dbSDenis V. Lunev return; 575fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 576405666dbSDenis V. Lunev 5774c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 5784c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 579c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 580c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 5811da177e4SLinus Torvalds 5824c9483b2SDavid S. Miller err = ip6_dst_lookup(sk, &dst, &fl6); 5831da177e4SLinus Torvalds if (err) 5841da177e4SLinus Torvalds goto out; 5854c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); 586452edd59SDavid S. Miller if (IS_ERR(dst)) 587e104411bSPatrick McHardy goto out; 5881da177e4SLinus Torvalds 5894c9483b2SDavid S. Miller if (ipv6_addr_is_multicast(&fl6.daddr)) 5901da177e4SLinus Torvalds hlimit = np->mcast_hops; 5911da177e4SLinus Torvalds else 5921da177e4SLinus Torvalds hlimit = np->hop_limit; 5931da177e4SLinus Torvalds if (hlimit < 0) 5946b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 5951da177e4SLinus Torvalds 596cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 5971da177e4SLinus Torvalds 5981da177e4SLinus Torvalds msg.skb = skb; 5991da177e4SLinus Torvalds msg.offset = 0; 600763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 6011da177e4SLinus Torvalds 6021da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 6034c9483b2SDavid S. Miller sizeof(struct icmp6hdr), hlimit, np->tclass, NULL, &fl6, 60413b52cd4SBrian Haley (struct rt6_info *)dst, MSG_DONTWAIT, 60513b52cd4SBrian Haley np->dontfrag); 6061da177e4SLinus Torvalds 6071da177e4SLinus Torvalds if (err) { 60800d9d6a1SEric Dumazet ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS); 6091da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 610cfdf7647SEric Dumazet } else { 611cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 612cfdf7647SEric Dumazet skb->len + sizeof(struct icmp6hdr)); 6131da177e4SLinus Torvalds } 6141da177e4SLinus Torvalds dst_release(dst); 6151da177e4SLinus Torvalds out: 616405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 6171da177e4SLinus Torvalds } 6181da177e4SLinus Torvalds 619b94f1c09SDavid S. Miller void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 6201da177e4SLinus Torvalds { 62141135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 6221da177e4SLinus Torvalds int inner_offset; 62375f2811cSJesse Gross __be16 frag_off; 624f9242b6bSDavid S. Miller u8 nexthdr; 6251da177e4SLinus Torvalds 6261da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 6271da177e4SLinus Torvalds return; 6281da177e4SLinus Torvalds 6291da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 6301da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 6311da177e4SLinus Torvalds /* now skip over extension headers */ 63275f2811cSJesse Gross inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 63375f2811cSJesse Gross &nexthdr, &frag_off); 6341da177e4SLinus Torvalds if (inner_offset<0) 6351da177e4SLinus Torvalds return; 6361da177e4SLinus Torvalds } else { 6371da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 6381da177e4SLinus Torvalds } 6391da177e4SLinus Torvalds 6401da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 6411da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 6421da177e4SLinus Torvalds return; 6431da177e4SLinus Torvalds 6441da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 6451da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 6461da177e4SLinus Torvalds pmtu discovery. 6471da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 6481da177e4SLinus Torvalds --ANK (980726) 6491da177e4SLinus Torvalds */ 6501da177e4SLinus Torvalds 6511da177e4SLinus Torvalds rcu_read_lock(); 652f9242b6bSDavid S. Miller ipprot = rcu_dereference(inet6_protos[nexthdr]); 6531da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 6541da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 6551da177e4SLinus Torvalds rcu_read_unlock(); 6561da177e4SLinus Torvalds 65769d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 6581da177e4SLinus Torvalds } 6591da177e4SLinus Torvalds 6601da177e4SLinus Torvalds /* 6611da177e4SLinus Torvalds * Handle icmp messages 6621da177e4SLinus Torvalds */ 6631da177e4SLinus Torvalds 664e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 6651da177e4SLinus Torvalds { 6661da177e4SLinus Torvalds struct net_device *dev = skb->dev; 6671da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 668b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 6691da177e4SLinus Torvalds struct icmp6hdr *hdr; 670d5fdd6baSBrian Haley u8 type; 6711da177e4SLinus Torvalds 672aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 673def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 6748b7817f3SHerbert Xu int nh; 6758b7817f3SHerbert Xu 676def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 677aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 678aebcf82cSHerbert Xu goto drop_no_count; 679aebcf82cSHerbert Xu 68081aded24SDavid S. Miller if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) 6818b7817f3SHerbert Xu goto drop_no_count; 6828b7817f3SHerbert Xu 6838b7817f3SHerbert Xu nh = skb_network_offset(skb); 6848b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 6858b7817f3SHerbert Xu 6868b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 6878b7817f3SHerbert Xu goto drop_no_count; 6888b7817f3SHerbert Xu 6898b7817f3SHerbert Xu skb_set_network_header(skb, nh); 6908b7817f3SHerbert Xu } 6918b7817f3SHerbert Xu 692e41b5368SDenis V. Lunev ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INMSGS); 6931da177e4SLinus Torvalds 6940660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 6950660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 6961da177e4SLinus Torvalds 6971da177e4SLinus Torvalds /* Perform checksum. */ 698fb286bb2SHerbert Xu switch (skb->ip_summed) { 69984fa7933SPatrick McHardy case CHECKSUM_COMPLETE: 700fb286bb2SHerbert Xu if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, 701fb286bb2SHerbert Xu skb->csum)) 702fb286bb2SHerbert Xu break; 703fb286bb2SHerbert Xu /* fall through */ 704fb286bb2SHerbert Xu case CHECKSUM_NONE: 705868c86bcSAl Viro skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len, 706868c86bcSAl Viro IPPROTO_ICMPV6, 0)); 707fb286bb2SHerbert Xu if (__skb_checksum_complete(skb)) { 7086d0bfe22SLorenzo Colitti LIMIT_NETDEBUG(KERN_DEBUG 7096d0bfe22SLorenzo Colitti "ICMPv6 checksum failed [%pI6c > %pI6c]\n", 7100c6ce78aSHarvey Harrison saddr, daddr); 7116a5dc9e5SEric Dumazet goto csum_error; 7121da177e4SLinus Torvalds } 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: 7306d0bfe22SLorenzo Colitti 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: 78064ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n"); 7811da177e4SLinus Torvalds 7821da177e4SLinus Torvalds /* informational */ 7831da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 7841da177e4SLinus Torvalds break; 7851da177e4SLinus Torvalds 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 7941da177e4SLinus Torvalds kfree_skb(skb); 7951da177e4SLinus Torvalds return 0; 7961da177e4SLinus Torvalds 7976a5dc9e5SEric Dumazet csum_error: 7986a5dc9e5SEric Dumazet ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); 7991da177e4SLinus Torvalds discard_it: 800e41b5368SDenis V. Lunev ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INERRORS); 8018b7817f3SHerbert Xu drop_no_count: 8021da177e4SLinus Torvalds kfree_skb(skb); 8031da177e4SLinus Torvalds return 0; 8041da177e4SLinus Torvalds } 8051da177e4SLinus Torvalds 8064c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, 80795e41e93SYOSHIFUJI Hideaki u8 type, 80895e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 80995e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 81095e41e93SYOSHIFUJI Hideaki int oif) 81195e41e93SYOSHIFUJI Hideaki { 8124c9483b2SDavid S. Miller memset(fl6, 0, sizeof(*fl6)); 8134e3fd7a0SAlexey Dobriyan fl6->saddr = *saddr; 8144e3fd7a0SAlexey Dobriyan fl6->daddr = *daddr; 8154c9483b2SDavid S. Miller fl6->flowi6_proto = IPPROTO_ICMPV6; 8161958b856SDavid S. Miller fl6->fl6_icmp_type = type; 8171958b856SDavid S. Miller fl6->fl6_icmp_code = 0; 8184c9483b2SDavid S. Miller fl6->flowi6_oif = oif; 8194c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); 82095e41e93SYOSHIFUJI Hideaki } 82195e41e93SYOSHIFUJI Hideaki 822640c41c7SIngo Molnar /* 823b7e729c4SDenis V. Lunev * Special lock-class for __icmpv6_sk: 824640c41c7SIngo Molnar */ 825640c41c7SIngo Molnar static struct lock_class_key icmpv6_socket_sk_dst_lock_key; 826640c41c7SIngo Molnar 82798c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 8281da177e4SLinus Torvalds { 8291da177e4SLinus Torvalds struct sock *sk; 8301da177e4SLinus Torvalds int err, i, j; 8311da177e4SLinus Torvalds 83298c6d1b2SDenis V. Lunev net->ipv6.icmp_sk = 83398c6d1b2SDenis V. Lunev kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); 83498c6d1b2SDenis V. Lunev if (net->ipv6.icmp_sk == NULL) 83579c91159SDenis V. Lunev return -ENOMEM; 83679c91159SDenis V. Lunev 8376f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8381ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 8391ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 8401da177e4SLinus Torvalds if (err < 0) { 841f3213831SJoe Perches pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", 8421da177e4SLinus Torvalds err); 8431da177e4SLinus Torvalds goto fail; 8441da177e4SLinus Torvalds } 8451da177e4SLinus Torvalds 8461ed8516fSDenis V. Lunev net->ipv6.icmp_sk[i] = sk; 8475c8cafd6SDenis V. Lunev 848640c41c7SIngo Molnar /* 849640c41c7SIngo Molnar * Split off their lock-class, because sk->sk_dst_lock 850640c41c7SIngo Molnar * gets used from softirqs, which is safe for 851b7e729c4SDenis V. Lunev * __icmpv6_sk (because those never get directly used 852640c41c7SIngo Molnar * via userspace syscalls), but unsafe for normal sockets. 853640c41c7SIngo Molnar */ 854640c41c7SIngo Molnar lockdep_set_class(&sk->sk_dst_lock, 855640c41c7SIngo Molnar &icmpv6_socket_sk_dst_lock_key); 8561da177e4SLinus Torvalds 8571da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 8581da177e4SLinus Torvalds * sk_buff struct overhead. 8591da177e4SLinus Torvalds */ 86087fb4b7bSEric Dumazet sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); 8611da177e4SLinus Torvalds } 8621da177e4SLinus Torvalds return 0; 8631da177e4SLinus Torvalds 8641da177e4SLinus Torvalds fail: 8655c8cafd6SDenis V. Lunev for (j = 0; j < i; j++) 8661ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); 86798c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 8681da177e4SLinus Torvalds return err; 8691da177e4SLinus Torvalds } 8701da177e4SLinus Torvalds 87198c6d1b2SDenis V. Lunev static void __net_exit icmpv6_sk_exit(struct net *net) 8721da177e4SLinus Torvalds { 8731da177e4SLinus Torvalds int i; 8741da177e4SLinus Torvalds 8756f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8761ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); 8771da177e4SLinus Torvalds } 87898c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 87998c6d1b2SDenis V. Lunev } 88098c6d1b2SDenis V. Lunev 8818ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 88298c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 88398c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 88498c6d1b2SDenis V. Lunev }; 88598c6d1b2SDenis V. Lunev 88698c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 88798c6d1b2SDenis V. Lunev { 88898c6d1b2SDenis V. Lunev int err; 88998c6d1b2SDenis V. Lunev 89098c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 89198c6d1b2SDenis V. Lunev if (err < 0) 89298c6d1b2SDenis V. Lunev return err; 89398c6d1b2SDenis V. Lunev 89498c6d1b2SDenis V. Lunev err = -EAGAIN; 89598c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 89698c6d1b2SDenis V. Lunev goto fail; 8975f5624cfSPravin B Shelar 8985f5624cfSPravin B Shelar err = inet6_register_icmp_sender(icmp6_send); 8995f5624cfSPravin B Shelar if (err) 9005f5624cfSPravin B Shelar goto sender_reg_err; 90198c6d1b2SDenis V. Lunev return 0; 90298c6d1b2SDenis V. Lunev 9035f5624cfSPravin B Shelar sender_reg_err: 9045f5624cfSPravin B Shelar inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 90598c6d1b2SDenis V. Lunev fail: 906f3213831SJoe Perches pr_err("Failed to register ICMP6 protocol\n"); 90798c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 90898c6d1b2SDenis V. Lunev return err; 90998c6d1b2SDenis V. Lunev } 91098c6d1b2SDenis V. Lunev 9118ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 91298c6d1b2SDenis V. Lunev { 9135f5624cfSPravin B Shelar inet6_unregister_icmp_sender(icmp6_send); 91498c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 9151da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 9161da177e4SLinus Torvalds } 9171da177e4SLinus Torvalds 91898c6d1b2SDenis V. Lunev 9199b5b5cffSArjan van de Ven static const struct icmp6_err { 9201da177e4SLinus Torvalds int err; 9211da177e4SLinus Torvalds int fatal; 9221da177e4SLinus Torvalds } tab_unreach[] = { 9231da177e4SLinus Torvalds { /* NOROUTE */ 9241da177e4SLinus Torvalds .err = ENETUNREACH, 9251da177e4SLinus Torvalds .fatal = 0, 9261da177e4SLinus Torvalds }, 9271da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 9281da177e4SLinus Torvalds .err = EACCES, 9291da177e4SLinus Torvalds .fatal = 1, 9301da177e4SLinus Torvalds }, 9311da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 9321da177e4SLinus Torvalds .err = EHOSTUNREACH, 9331da177e4SLinus Torvalds .fatal = 0, 9341da177e4SLinus Torvalds }, 9351da177e4SLinus Torvalds { /* ADDR_UNREACH */ 9361da177e4SLinus Torvalds .err = EHOSTUNREACH, 9371da177e4SLinus Torvalds .fatal = 0, 9381da177e4SLinus Torvalds }, 9391da177e4SLinus Torvalds { /* PORT_UNREACH */ 9401da177e4SLinus Torvalds .err = ECONNREFUSED, 9411da177e4SLinus Torvalds .fatal = 1, 9421da177e4SLinus Torvalds }, 9431da177e4SLinus Torvalds }; 9441da177e4SLinus Torvalds 945d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 9461da177e4SLinus Torvalds { 9471da177e4SLinus Torvalds int fatal = 0; 9481da177e4SLinus Torvalds 9491da177e4SLinus Torvalds *err = EPROTO; 9501da177e4SLinus Torvalds 9511da177e4SLinus Torvalds switch (type) { 9521da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 9531da177e4SLinus Torvalds fatal = 1; 9541da177e4SLinus Torvalds if (code <= ICMPV6_PORT_UNREACH) { 9551da177e4SLinus Torvalds *err = tab_unreach[code].err; 9561da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 9571da177e4SLinus Torvalds } 9581da177e4SLinus Torvalds break; 9591da177e4SLinus Torvalds 9601da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 9611da177e4SLinus Torvalds *err = EMSGSIZE; 9621da177e4SLinus Torvalds break; 9631da177e4SLinus Torvalds 9641da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 9651da177e4SLinus Torvalds *err = EPROTO; 9661da177e4SLinus Torvalds fatal = 1; 9671da177e4SLinus Torvalds break; 9681da177e4SLinus Torvalds 9691da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 9701da177e4SLinus Torvalds *err = EHOSTUNREACH; 9711da177e4SLinus Torvalds break; 9723ff50b79SStephen Hemminger } 9731da177e4SLinus Torvalds 9741da177e4SLinus Torvalds return fatal; 9751da177e4SLinus Torvalds } 9767159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 9777159039aSYOSHIFUJI Hideaki 9781da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 979760f2d01SDaniel Lezcano ctl_table ipv6_icmp_table_template[] = { 9801da177e4SLinus Torvalds { 9811da177e4SLinus Torvalds .procname = "ratelimit", 98241a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 9831da177e4SLinus Torvalds .maxlen = sizeof(int), 9841da177e4SLinus Torvalds .mode = 0644, 9856d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 9861da177e4SLinus Torvalds }, 987f8572d8fSEric W. Biederman { }, 9881da177e4SLinus Torvalds }; 989760f2d01SDaniel Lezcano 9902c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 991760f2d01SDaniel Lezcano { 992760f2d01SDaniel Lezcano struct ctl_table *table; 993760f2d01SDaniel Lezcano 994760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 995760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 996760f2d01SDaniel Lezcano GFP_KERNEL); 9975ee09105SYOSHIFUJI Hideaki 998c027aab4SEric W. Biederman if (table) 9995ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 10005ee09105SYOSHIFUJI Hideaki 1001760f2d01SDaniel Lezcano return table; 1002760f2d01SDaniel Lezcano } 10031da177e4SLinus Torvalds #endif 10041da177e4SLinus Torvalds 1005