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> 601da177e4SLinus Torvalds #include <net/protocol.h> 611da177e4SLinus Torvalds #include <net/raw.h> 621da177e4SLinus Torvalds #include <net/rawv6.h> 631da177e4SLinus Torvalds #include <net/transp_v6.h> 641da177e4SLinus Torvalds #include <net/ip6_route.h> 651da177e4SLinus Torvalds #include <net/addrconf.h> 661da177e4SLinus Torvalds #include <net/icmp.h> 678b7817f3SHerbert Xu #include <net/xfrm.h> 681ed8516fSDenis V. Lunev #include <net/inet_common.h> 691da177e4SLinus Torvalds 701da177e4SLinus Torvalds #include <asm/uaccess.h> 711da177e4SLinus Torvalds 721da177e4SLinus Torvalds /* 731da177e4SLinus Torvalds * The ICMP socket(s). This is the most convenient way to flow control 741da177e4SLinus Torvalds * our ICMP output as well as maintain a clean interface throughout 751da177e4SLinus Torvalds * all layers. All Socketless IP sends will soon be gone. 761da177e4SLinus Torvalds * 771da177e4SLinus Torvalds * On SMP we have one ICMP socket per-cpu. 781da177e4SLinus Torvalds */ 7998c6d1b2SDenis V. Lunev static inline struct sock *icmpv6_sk(struct net *net) 8098c6d1b2SDenis V. Lunev { 8198c6d1b2SDenis V. Lunev return net->ipv6.icmp_sk[smp_processor_id()]; 8298c6d1b2SDenis V. Lunev } 831da177e4SLinus Torvalds 846f809da2SSteffen Klassert static void icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 856f809da2SSteffen Klassert u8 type, u8 code, int offset, __be32 info) 866f809da2SSteffen Klassert { 876f809da2SSteffen Klassert struct net *net = dev_net(skb->dev); 886f809da2SSteffen Klassert 896f809da2SSteffen Klassert if (type == ICMPV6_PKT_TOOBIG) 906f809da2SSteffen Klassert ip6_update_pmtu(skb, net, info, 0, 0); 916f809da2SSteffen Klassert else if (type == NDISC_REDIRECT) 926f809da2SSteffen Klassert ip6_redirect(skb, net, 0, 0); 936f809da2SSteffen Klassert } 946f809da2SSteffen Klassert 95e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb); 961da177e4SLinus Torvalds 9741135cc8SAlexey Dobriyan static const struct inet6_protocol icmpv6_protocol = { 981da177e4SLinus Torvalds .handler = icmpv6_rcv, 996f809da2SSteffen Klassert .err_handler = icmpv6_err, 1008b7817f3SHerbert Xu .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1011da177e4SLinus Torvalds }; 1021da177e4SLinus Torvalds 103fdc0bde9SDenis V. Lunev static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) 1041da177e4SLinus Torvalds { 105fdc0bde9SDenis V. Lunev struct sock *sk; 106fdc0bde9SDenis V. Lunev 1071da177e4SLinus Torvalds local_bh_disable(); 1081da177e4SLinus Torvalds 109fdc0bde9SDenis V. Lunev sk = icmpv6_sk(net); 110405666dbSDenis V. Lunev if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { 1111da177e4SLinus Torvalds /* This can happen if the output path (f.e. SIT or 1121da177e4SLinus Torvalds * ip6ip6 tunnel) signals dst_link_failure() for an 1131da177e4SLinus Torvalds * outgoing ICMP6 packet. 1141da177e4SLinus Torvalds */ 1151da177e4SLinus Torvalds local_bh_enable(); 116fdc0bde9SDenis V. Lunev return NULL; 1171da177e4SLinus Torvalds } 118fdc0bde9SDenis V. Lunev return sk; 1191da177e4SLinus Torvalds } 1201da177e4SLinus Torvalds 121405666dbSDenis V. Lunev static __inline__ void icmpv6_xmit_unlock(struct sock *sk) 1221da177e4SLinus Torvalds { 123405666dbSDenis V. Lunev spin_unlock_bh(&sk->sk_lock.slock); 1241da177e4SLinus Torvalds } 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds /* 1271da177e4SLinus Torvalds * Slightly more convenient version of icmpv6_send. 1281da177e4SLinus Torvalds */ 129d5fdd6baSBrian Haley void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) 1301da177e4SLinus Torvalds { 1313ffe533cSAlexey Dobriyan icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos); 1321da177e4SLinus Torvalds kfree_skb(skb); 1331da177e4SLinus Torvalds } 1341da177e4SLinus Torvalds 1351da177e4SLinus Torvalds /* 1361da177e4SLinus Torvalds * Figure out, may we reply to this packet with icmp error. 1371da177e4SLinus Torvalds * 1381da177e4SLinus Torvalds * We do not reply, if: 1391da177e4SLinus Torvalds * - it was icmp error message. 1401da177e4SLinus Torvalds * - it is truncated, so that it is known, that protocol is ICMPV6 1411da177e4SLinus Torvalds * (i.e. in the middle of some exthdr) 1421da177e4SLinus Torvalds * 1431da177e4SLinus Torvalds * --ANK (980726) 1441da177e4SLinus Torvalds */ 1451da177e4SLinus Torvalds 146a50feda5SEric Dumazet static bool is_ineligible(const struct sk_buff *skb) 1471da177e4SLinus Torvalds { 1480660e03fSArnaldo Carvalho de Melo int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; 1491da177e4SLinus Torvalds int len = skb->len - ptr; 1500660e03fSArnaldo Carvalho de Melo __u8 nexthdr = ipv6_hdr(skb)->nexthdr; 15175f2811cSJesse Gross __be16 frag_off; 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds if (len < 0) 154a50feda5SEric Dumazet return true; 1551da177e4SLinus Torvalds 15675f2811cSJesse Gross ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off); 1571da177e4SLinus Torvalds if (ptr < 0) 158a50feda5SEric Dumazet return false; 1591da177e4SLinus Torvalds if (nexthdr == IPPROTO_ICMPV6) { 1601da177e4SLinus Torvalds u8 _type, *tp; 1611da177e4SLinus Torvalds tp = skb_header_pointer(skb, 1621da177e4SLinus Torvalds ptr+offsetof(struct icmp6hdr, icmp6_type), 1631da177e4SLinus Torvalds sizeof(_type), &_type); 1641da177e4SLinus Torvalds if (tp == NULL || 1651da177e4SLinus Torvalds !(*tp & ICMPV6_INFOMSG_MASK)) 166a50feda5SEric Dumazet return true; 1671da177e4SLinus Torvalds } 168a50feda5SEric Dumazet return false; 1691da177e4SLinus Torvalds } 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds /* 1721da177e4SLinus Torvalds * Check the ICMP output rate limit 1731da177e4SLinus Torvalds */ 17492d86829SDavid S. Miller static inline bool icmpv6_xrlim_allow(struct sock *sk, u8 type, 1754c9483b2SDavid S. Miller struct flowi6 *fl6) 1761da177e4SLinus Torvalds { 1771da177e4SLinus Torvalds struct dst_entry *dst; 1783b1e0a65SYOSHIFUJI Hideaki struct net *net = sock_net(sk); 17992d86829SDavid S. Miller bool res = false; 1801da177e4SLinus Torvalds 1811da177e4SLinus Torvalds /* Informational messages are not limited. */ 1821da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 18392d86829SDavid S. Miller return true; 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds /* Do not limit pmtu discovery, it would break it. */ 1861da177e4SLinus Torvalds if (type == ICMPV6_PKT_TOOBIG) 18792d86829SDavid S. Miller return true; 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds /* 1901da177e4SLinus Torvalds * Look up the output route. 1911da177e4SLinus Torvalds * XXX: perhaps the expire for routing entries cloned by 1921da177e4SLinus Torvalds * this lookup should be more aggressive (not longer than timeout). 1931da177e4SLinus Torvalds */ 1944c9483b2SDavid S. Miller dst = ip6_route_output(net, sk, fl6); 1951da177e4SLinus Torvalds if (dst->error) { 1963bd653c8SDenis V. Lunev IP6_INC_STATS(net, ip6_dst_idev(dst), 197a11d206dSYOSHIFUJI Hideaki IPSTATS_MIB_OUTNOROUTES); 1981da177e4SLinus Torvalds } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { 19992d86829SDavid S. Miller res = true; 2001da177e4SLinus Torvalds } else { 2011da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 2029a43b709SBenjamin Thery int tmo = net->ipv6.sysctl.icmpv6_time; 203fbfe95a4SDavid S. Miller struct inet_peer *peer; 2041da177e4SLinus Torvalds 2051da177e4SLinus Torvalds /* Give more bandwidth to wider prefixes. */ 2061da177e4SLinus Torvalds if (rt->rt6i_dst.plen < 128) 2071da177e4SLinus Torvalds tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 2081da177e4SLinus Torvalds 2091d861aa4SDavid S. Miller peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1); 210fbfe95a4SDavid S. Miller res = inet_peer_xrlim_allow(peer, tmo); 2111d861aa4SDavid S. Miller if (peer) 2121d861aa4SDavid S. Miller inet_putpeer(peer); 2131da177e4SLinus Torvalds } 2141da177e4SLinus Torvalds dst_release(dst); 2151da177e4SLinus Torvalds return res; 2161da177e4SLinus Torvalds } 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds /* 2191da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2201da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2211da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2221da177e4SLinus Torvalds * highest-order two bits set to 10 2231da177e4SLinus Torvalds */ 2241da177e4SLinus Torvalds 225a50feda5SEric Dumazet static bool opt_unrec(struct sk_buff *skb, __u32 offset) 2261da177e4SLinus Torvalds { 2271da177e4SLinus Torvalds u8 _optval, *op; 2281da177e4SLinus Torvalds 229bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2301da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 2311da177e4SLinus Torvalds if (op == NULL) 232a50feda5SEric Dumazet return true; 2331da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2341da177e4SLinus Torvalds } 2351da177e4SLinus Torvalds 2364c9483b2SDavid S. Miller static int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, struct icmp6hdr *thdr, int len) 2371da177e4SLinus Torvalds { 2381da177e4SLinus Torvalds struct sk_buff *skb; 2391da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2401da177e4SLinus Torvalds int err = 0; 2411da177e4SLinus Torvalds 2421da177e4SLinus Torvalds if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 2431da177e4SLinus Torvalds goto out; 2441da177e4SLinus Torvalds 245cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2461da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2471da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2481da177e4SLinus Torvalds 2491da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 25007f0757aSJoe Perches skb->csum = csum_partial(icmp6h, 2511da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2524c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2534c9483b2SDavid S. Miller &fl6->daddr, 2544c9483b2SDavid S. Miller len, fl6->flowi6_proto, 2551da177e4SLinus Torvalds skb->csum); 2561da177e4SLinus Torvalds } else { 257868c86bcSAl Viro __wsum tmp_csum = 0; 2581da177e4SLinus Torvalds 2591da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2601da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2611da177e4SLinus Torvalds } 2621da177e4SLinus Torvalds 26307f0757aSJoe Perches tmp_csum = csum_partial(icmp6h, 2641da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 2654c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2664c9483b2SDavid S. Miller &fl6->daddr, 2674c9483b2SDavid S. Miller len, fl6->flowi6_proto, 268868c86bcSAl Viro tmp_csum); 2691da177e4SLinus Torvalds } 2701da177e4SLinus Torvalds ip6_push_pending_frames(sk); 2711da177e4SLinus Torvalds out: 2721da177e4SLinus Torvalds return err; 2731da177e4SLinus Torvalds } 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvalds struct icmpv6_msg { 2761da177e4SLinus Torvalds struct sk_buff *skb; 2771da177e4SLinus Torvalds int offset; 278763ecff1SYasuyuki Kozakai uint8_t type; 2791da177e4SLinus Torvalds }; 2801da177e4SLinus Torvalds 2811da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 2821da177e4SLinus Torvalds { 2831da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 2841da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 2855f92a738SAl Viro __wsum csum = 0; 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 2881da177e4SLinus Torvalds to, len, csum); 2891da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 290763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 291763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 2921da177e4SLinus Torvalds return 0; 2931da177e4SLinus Torvalds } 2941da177e4SLinus Torvalds 29507a93626SAmerigo Wang #if IS_ENABLED(CONFIG_IPV6_MIP6) 29679383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 29779383236SMasahide NAKAMURA { 2980660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 29979383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 30079383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 30179383236SMasahide NAKAMURA struct in6_addr tmp; 30279383236SMasahide NAKAMURA int off; 30379383236SMasahide NAKAMURA 30479383236SMasahide NAKAMURA if (opt->dsthao) { 30579383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 30679383236SMasahide NAKAMURA if (likely(off >= 0)) { 307d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 308d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 3094e3fd7a0SAlexey Dobriyan tmp = iph->saddr; 3104e3fd7a0SAlexey Dobriyan iph->saddr = hao->addr; 3114e3fd7a0SAlexey Dobriyan hao->addr = tmp; 31279383236SMasahide NAKAMURA } 31379383236SMasahide NAKAMURA } 31479383236SMasahide NAKAMURA } 31579383236SMasahide NAKAMURA #else 31679383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 31779383236SMasahide NAKAMURA #endif 31879383236SMasahide NAKAMURA 319b42835dbSDavid S. Miller static struct dst_entry *icmpv6_route_lookup(struct net *net, struct sk_buff *skb, 3204c9483b2SDavid S. Miller struct sock *sk, struct flowi6 *fl6) 321b42835dbSDavid S. Miller { 322b42835dbSDavid S. Miller struct dst_entry *dst, *dst2; 3234c9483b2SDavid S. Miller struct flowi6 fl2; 324b42835dbSDavid S. Miller int err; 325b42835dbSDavid S. Miller 3264c9483b2SDavid S. Miller err = ip6_dst_lookup(sk, &dst, fl6); 327b42835dbSDavid S. Miller if (err) 328b42835dbSDavid S. Miller return ERR_PTR(err); 329b42835dbSDavid S. Miller 330b42835dbSDavid S. Miller /* 331b42835dbSDavid S. Miller * We won't send icmp if the destination is known 332b42835dbSDavid S. Miller * anycast. 333b42835dbSDavid S. Miller */ 334b42835dbSDavid S. Miller if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { 335b42835dbSDavid S. Miller LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n"); 336b42835dbSDavid S. Miller dst_release(dst); 337b42835dbSDavid S. Miller return ERR_PTR(-EINVAL); 338b42835dbSDavid S. Miller } 339b42835dbSDavid S. Miller 340b42835dbSDavid S. Miller /* No need to clone since we're just using its address. */ 341b42835dbSDavid S. Miller dst2 = dst; 342b42835dbSDavid S. Miller 3434c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); 344452edd59SDavid S. Miller if (!IS_ERR(dst)) { 345b42835dbSDavid S. Miller if (dst != dst2) 346b42835dbSDavid S. Miller return dst; 347452edd59SDavid S. Miller } else { 348452edd59SDavid S. Miller if (PTR_ERR(dst) == -EPERM) 349b42835dbSDavid S. Miller dst = NULL; 350452edd59SDavid S. Miller else 351452edd59SDavid S. Miller return dst; 352b42835dbSDavid S. Miller } 353b42835dbSDavid S. Miller 3544c9483b2SDavid S. Miller err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); 355b42835dbSDavid S. Miller if (err) 356b42835dbSDavid S. Miller goto relookup_failed; 357b42835dbSDavid S. Miller 358b42835dbSDavid S. Miller err = ip6_dst_lookup(sk, &dst2, &fl2); 359b42835dbSDavid S. Miller if (err) 360b42835dbSDavid S. Miller goto relookup_failed; 361b42835dbSDavid S. Miller 3624c9483b2SDavid S. Miller dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); 363452edd59SDavid S. Miller if (!IS_ERR(dst2)) { 364b42835dbSDavid S. Miller dst_release(dst); 365b42835dbSDavid S. Miller dst = dst2; 366452edd59SDavid S. Miller } else { 367452edd59SDavid S. Miller err = PTR_ERR(dst2); 368452edd59SDavid S. Miller if (err == -EPERM) { 369b42835dbSDavid S. Miller dst_release(dst); 370452edd59SDavid S. Miller return dst2; 371452edd59SDavid S. Miller } else 372b42835dbSDavid S. Miller goto relookup_failed; 373b42835dbSDavid S. Miller } 374b42835dbSDavid S. Miller 375b42835dbSDavid S. Miller relookup_failed: 376b42835dbSDavid S. Miller if (dst) 377b42835dbSDavid S. Miller return dst; 378b42835dbSDavid S. Miller return ERR_PTR(err); 379b42835dbSDavid S. Miller } 380b42835dbSDavid S. Miller 3811da177e4SLinus Torvalds /* 3821da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 3831da177e4SLinus Torvalds */ 3843ffe533cSAlexey Dobriyan void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info) 3851da177e4SLinus Torvalds { 386c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 3871da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 3880660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 38984427d53SYOSHIFUJI Hideaki struct sock *sk; 39084427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 391b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 3921da177e4SLinus Torvalds struct dst_entry *dst; 3931da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 3944c9483b2SDavid S. Miller struct flowi6 fl6; 3951da177e4SLinus Torvalds struct icmpv6_msg msg; 3961da177e4SLinus Torvalds int iif = 0; 3971da177e4SLinus Torvalds int addr_type = 0; 3981da177e4SLinus Torvalds int len; 399e651f03aSGerrit Renker int hlimit; 4001da177e4SLinus Torvalds int err = 0; 4011da177e4SLinus Torvalds 40227a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 40327a884dcSArnaldo Carvalho de Melo (skb->network_header + sizeof(*hdr)) > skb->tail) 4041da177e4SLinus Torvalds return; 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds /* 4071da177e4SLinus Torvalds * Make sure we respect the rules 4081da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 4091da177e4SLinus Torvalds * Rule (e.1) is enforced by not using icmpv6_send 4101da177e4SLinus Torvalds * in any code that processes icmp errors. 4111da177e4SLinus Torvalds */ 4121da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 4131da177e4SLinus Torvalds 4149a43b709SBenjamin Thery if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0)) 4151da177e4SLinus Torvalds saddr = &hdr->daddr; 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds /* 4181da177e4SLinus Torvalds * Dest addr check 4191da177e4SLinus Torvalds */ 4201da177e4SLinus Torvalds 4211da177e4SLinus Torvalds if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) { 4221da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 4231da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 4241da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 4251da177e4SLinus Torvalds (opt_unrec(skb, info)))) 4261da177e4SLinus Torvalds return; 4271da177e4SLinus Torvalds 4281da177e4SLinus Torvalds saddr = NULL; 4291da177e4SLinus Torvalds } 4301da177e4SLinus Torvalds 4311da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 4321da177e4SLinus Torvalds 4331da177e4SLinus Torvalds /* 4341da177e4SLinus Torvalds * Source addr check 4351da177e4SLinus Torvalds */ 4361da177e4SLinus Torvalds 4371da177e4SLinus Torvalds if (addr_type & IPV6_ADDR_LINKLOCAL) 4381da177e4SLinus Torvalds iif = skb->dev->ifindex; 4391da177e4SLinus Torvalds 4401da177e4SLinus Torvalds /* 4418de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 4428de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 4438de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 4448de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 4451da177e4SLinus Torvalds */ 4461da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 44764ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n"); 4481da177e4SLinus Torvalds return; 4491da177e4SLinus Torvalds } 4501da177e4SLinus Torvalds 4511da177e4SLinus Torvalds /* 4521da177e4SLinus Torvalds * Never answer to a ICMP packet. 4531da177e4SLinus Torvalds */ 4541da177e4SLinus Torvalds if (is_ineligible(skb)) { 45564ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n"); 4561da177e4SLinus Torvalds return; 4571da177e4SLinus Torvalds } 4581da177e4SLinus Torvalds 45979383236SMasahide NAKAMURA mip6_addr_swap(skb); 46079383236SMasahide NAKAMURA 4614c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 4624c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 4634e3fd7a0SAlexey Dobriyan fl6.daddr = hdr->saddr; 4641da177e4SLinus Torvalds if (saddr) 4654e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 4664c9483b2SDavid S. Miller fl6.flowi6_oif = iif; 4671958b856SDavid S. Miller fl6.fl6_icmp_type = type; 4681958b856SDavid S. Miller fl6.fl6_icmp_code = code; 4694c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 4701da177e4SLinus Torvalds 471fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 472fdc0bde9SDenis V. Lunev if (sk == NULL) 473405666dbSDenis V. Lunev return; 474fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 475405666dbSDenis V. Lunev 4764c9483b2SDavid S. Miller if (!icmpv6_xrlim_allow(sk, type, &fl6)) 4771da177e4SLinus Torvalds goto out; 4781da177e4SLinus Torvalds 4791da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 4801da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 4811da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 4821da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 4831da177e4SLinus Torvalds 4844c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 4854c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 486c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 487c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 4881da177e4SLinus Torvalds 4894c9483b2SDavid S. Miller dst = icmpv6_route_lookup(net, skb, sk, &fl6); 490b42835dbSDavid S. Miller if (IS_ERR(dst)) 4911da177e4SLinus Torvalds goto out; 4928de3351eSYOSHIFUJI Hideaki 4934c9483b2SDavid S. Miller if (ipv6_addr_is_multicast(&fl6.daddr)) 4941da177e4SLinus Torvalds hlimit = np->mcast_hops; 4951da177e4SLinus Torvalds else 4961da177e4SLinus Torvalds hlimit = np->hop_limit; 4971da177e4SLinus Torvalds if (hlimit < 0) 4986b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 4991da177e4SLinus Torvalds 5001da177e4SLinus Torvalds msg.skb = skb; 501bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 502763ecff1SYasuyuki Kozakai msg.type = type; 5031da177e4SLinus Torvalds 5041da177e4SLinus Torvalds len = skb->len - msg.offset; 5051da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); 5061da177e4SLinus Torvalds if (len < 0) { 50764ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n"); 5081da177e4SLinus Torvalds goto out_dst_release; 5091da177e4SLinus Torvalds } 5101da177e4SLinus Torvalds 511cfdf7647SEric Dumazet rcu_read_lock(); 512cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, 5151da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 516e651f03aSGerrit Renker sizeof(struct icmp6hdr), hlimit, 5174c9483b2SDavid S. Miller np->tclass, NULL, &fl6, (struct rt6_info *)dst, 51813b52cd4SBrian Haley MSG_DONTWAIT, np->dontfrag); 5191da177e4SLinus Torvalds if (err) { 52000d9d6a1SEric Dumazet ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS); 5211da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 522cfdf7647SEric Dumazet } else { 523cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 524cfdf7647SEric Dumazet len + sizeof(struct icmp6hdr)); 5251da177e4SLinus Torvalds } 526cfdf7647SEric Dumazet rcu_read_unlock(); 5271da177e4SLinus Torvalds out_dst_release: 5281da177e4SLinus Torvalds dst_release(dst); 5291da177e4SLinus Torvalds out: 530405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5311da177e4SLinus Torvalds } 5327159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_send); 5337159039aSYOSHIFUJI Hideaki 5341da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 5351da177e4SLinus Torvalds { 536c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 53784427d53SYOSHIFUJI Hideaki struct sock *sk; 5381da177e4SLinus Torvalds struct inet6_dev *idev; 53984427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 540b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 541cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 5421da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 5434c9483b2SDavid S. Miller struct flowi6 fl6; 5441da177e4SLinus Torvalds struct icmpv6_msg msg; 5451da177e4SLinus Torvalds struct dst_entry *dst; 5461da177e4SLinus Torvalds int err = 0; 5471da177e4SLinus Torvalds int hlimit; 5481da177e4SLinus Torvalds 5490660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 5501da177e4SLinus Torvalds 5511da177e4SLinus Torvalds if (!ipv6_unicast_destination(skb)) 5521da177e4SLinus Torvalds saddr = NULL; 5531da177e4SLinus Torvalds 5541da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 5551da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 5561da177e4SLinus Torvalds 5574c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 5584c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 5594e3fd7a0SAlexey Dobriyan fl6.daddr = ipv6_hdr(skb)->saddr; 5601da177e4SLinus Torvalds if (saddr) 5614e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 5624c9483b2SDavid S. Miller fl6.flowi6_oif = skb->dev->ifindex; 5631958b856SDavid S. Miller fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; 5644c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 5651da177e4SLinus Torvalds 566fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 567fdc0bde9SDenis V. Lunev if (sk == NULL) 568405666dbSDenis V. Lunev return; 569fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 570405666dbSDenis V. Lunev 5714c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 5724c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 573c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 574c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 5751da177e4SLinus Torvalds 5764c9483b2SDavid S. Miller err = ip6_dst_lookup(sk, &dst, &fl6); 5771da177e4SLinus Torvalds if (err) 5781da177e4SLinus Torvalds goto out; 5794c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); 580452edd59SDavid S. Miller if (IS_ERR(dst)) 581e104411bSPatrick McHardy goto out; 5821da177e4SLinus Torvalds 5834c9483b2SDavid S. Miller if (ipv6_addr_is_multicast(&fl6.daddr)) 5841da177e4SLinus Torvalds hlimit = np->mcast_hops; 5851da177e4SLinus Torvalds else 5861da177e4SLinus Torvalds hlimit = np->hop_limit; 5871da177e4SLinus Torvalds if (hlimit < 0) 5886b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 5891da177e4SLinus Torvalds 590cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 5911da177e4SLinus Torvalds 5921da177e4SLinus Torvalds msg.skb = skb; 5931da177e4SLinus Torvalds msg.offset = 0; 594763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 5951da177e4SLinus Torvalds 5961da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 5974c9483b2SDavid S. Miller sizeof(struct icmp6hdr), hlimit, np->tclass, NULL, &fl6, 59813b52cd4SBrian Haley (struct rt6_info *)dst, MSG_DONTWAIT, 59913b52cd4SBrian Haley np->dontfrag); 6001da177e4SLinus Torvalds 6011da177e4SLinus Torvalds if (err) { 60200d9d6a1SEric Dumazet ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS); 6031da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 604cfdf7647SEric Dumazet } else { 605cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 606cfdf7647SEric Dumazet skb->len + sizeof(struct icmp6hdr)); 6071da177e4SLinus Torvalds } 6081da177e4SLinus Torvalds dst_release(dst); 6091da177e4SLinus Torvalds out: 610405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 6111da177e4SLinus Torvalds } 6121da177e4SLinus Torvalds 613b94f1c09SDavid S. Miller void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 6141da177e4SLinus Torvalds { 61541135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 6161da177e4SLinus Torvalds int inner_offset; 61775f2811cSJesse Gross __be16 frag_off; 618f9242b6bSDavid S. Miller u8 nexthdr; 6191da177e4SLinus Torvalds 6201da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 6211da177e4SLinus Torvalds return; 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 6241da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 6251da177e4SLinus Torvalds /* now skip over extension headers */ 62675f2811cSJesse Gross inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 62775f2811cSJesse Gross &nexthdr, &frag_off); 6281da177e4SLinus Torvalds if (inner_offset<0) 6291da177e4SLinus Torvalds return; 6301da177e4SLinus Torvalds } else { 6311da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 6321da177e4SLinus Torvalds } 6331da177e4SLinus Torvalds 6341da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 6351da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 6361da177e4SLinus Torvalds return; 6371da177e4SLinus Torvalds 6381da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 6391da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 6401da177e4SLinus Torvalds pmtu discovery. 6411da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 6421da177e4SLinus Torvalds --ANK (980726) 6431da177e4SLinus Torvalds */ 6441da177e4SLinus Torvalds 6451da177e4SLinus Torvalds rcu_read_lock(); 646f9242b6bSDavid S. Miller ipprot = rcu_dereference(inet6_protos[nexthdr]); 6471da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 6481da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 6491da177e4SLinus Torvalds rcu_read_unlock(); 6501da177e4SLinus Torvalds 65169d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 6521da177e4SLinus Torvalds } 6531da177e4SLinus Torvalds 6541da177e4SLinus Torvalds /* 6551da177e4SLinus Torvalds * Handle icmp messages 6561da177e4SLinus Torvalds */ 6571da177e4SLinus Torvalds 658e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 6591da177e4SLinus Torvalds { 6601da177e4SLinus Torvalds struct net_device *dev = skb->dev; 6611da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 662b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 6631da177e4SLinus Torvalds struct icmp6hdr *hdr; 664d5fdd6baSBrian Haley u8 type; 6651da177e4SLinus Torvalds 666aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 667def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 6688b7817f3SHerbert Xu int nh; 6698b7817f3SHerbert Xu 670def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 671aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 672aebcf82cSHerbert Xu goto drop_no_count; 673aebcf82cSHerbert Xu 67481aded24SDavid S. Miller if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) 6758b7817f3SHerbert Xu goto drop_no_count; 6768b7817f3SHerbert Xu 6778b7817f3SHerbert Xu nh = skb_network_offset(skb); 6788b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 6798b7817f3SHerbert Xu 6808b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 6818b7817f3SHerbert Xu goto drop_no_count; 6828b7817f3SHerbert Xu 6838b7817f3SHerbert Xu skb_set_network_header(skb, nh); 6848b7817f3SHerbert Xu } 6858b7817f3SHerbert Xu 686e41b5368SDenis V. Lunev ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INMSGS); 6871da177e4SLinus Torvalds 6880660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 6890660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 6901da177e4SLinus Torvalds 6911da177e4SLinus Torvalds /* Perform checksum. */ 692fb286bb2SHerbert Xu switch (skb->ip_summed) { 69384fa7933SPatrick McHardy case CHECKSUM_COMPLETE: 694fb286bb2SHerbert Xu if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, 695fb286bb2SHerbert Xu skb->csum)) 696fb286bb2SHerbert Xu break; 697fb286bb2SHerbert Xu /* fall through */ 698fb286bb2SHerbert Xu case CHECKSUM_NONE: 699868c86bcSAl Viro skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len, 700868c86bcSAl Viro IPPROTO_ICMPV6, 0)); 701fb286bb2SHerbert Xu if (__skb_checksum_complete(skb)) { 7025b095d98SHarvey Harrison LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [%pI6 > %pI6]\n", 7030c6ce78aSHarvey Harrison saddr, daddr); 7041da177e4SLinus Torvalds goto discard_it; 7051da177e4SLinus Torvalds } 7061da177e4SLinus Torvalds } 7071da177e4SLinus Torvalds 7088cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 7098cf22943SHerbert Xu goto discard_it; 7101da177e4SLinus Torvalds 711cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 7121da177e4SLinus Torvalds 7131da177e4SLinus Torvalds type = hdr->icmp6_type; 7141da177e4SLinus Torvalds 71555d43808SDenis V. Lunev ICMP6MSGIN_INC_STATS_BH(dev_net(dev), idev, type); 7161da177e4SLinus Torvalds 7171da177e4SLinus Torvalds switch (type) { 7181da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 7191da177e4SLinus Torvalds icmpv6_echo_reply(skb); 7201da177e4SLinus Torvalds break; 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 7231da177e4SLinus Torvalds /* we couldn't care less */ 7241da177e4SLinus Torvalds break; 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 7271da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 7281da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 7291da177e4SLinus Torvalds destination cache will allow to solve this problem 7301da177e4SLinus Torvalds --ANK (980726) 7311da177e4SLinus Torvalds */ 7321da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 7331da177e4SLinus Torvalds goto discard_it; 734cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 7351da177e4SLinus Torvalds 7361da177e4SLinus Torvalds /* 7371da177e4SLinus Torvalds * Drop through to notify 7381da177e4SLinus Torvalds */ 7391da177e4SLinus Torvalds 7401da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 7411da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 7421da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 7431da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7441da177e4SLinus Torvalds break; 7451da177e4SLinus Torvalds 7461da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 7471da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 7481da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 7491da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 7501da177e4SLinus Torvalds case NDISC_REDIRECT: 7511da177e4SLinus Torvalds ndisc_rcv(skb); 7521da177e4SLinus Torvalds break; 7531da177e4SLinus Torvalds 7541da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 7551da177e4SLinus Torvalds igmp6_event_query(skb); 7561da177e4SLinus Torvalds break; 7571da177e4SLinus Torvalds 7581da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 7591da177e4SLinus Torvalds igmp6_event_report(skb); 7601da177e4SLinus Torvalds break; 7611da177e4SLinus Torvalds 7621da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 7631da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 7641da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 7651da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 7661da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 7671da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 7681da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 7691da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 7701da177e4SLinus Torvalds break; 7711da177e4SLinus Torvalds 7721da177e4SLinus Torvalds default: 77364ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n"); 7741da177e4SLinus Torvalds 7751da177e4SLinus Torvalds /* informational */ 7761da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 7771da177e4SLinus Torvalds break; 7781da177e4SLinus Torvalds 7791da177e4SLinus Torvalds /* 7801da177e4SLinus Torvalds * error of unknown type. 7811da177e4SLinus Torvalds * must pass to upper level 7821da177e4SLinus Torvalds */ 7831da177e4SLinus Torvalds 7841da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7853ff50b79SStephen Hemminger } 7863ff50b79SStephen Hemminger 7871da177e4SLinus Torvalds kfree_skb(skb); 7881da177e4SLinus Torvalds return 0; 7891da177e4SLinus Torvalds 7901da177e4SLinus Torvalds discard_it: 791e41b5368SDenis V. Lunev ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INERRORS); 7928b7817f3SHerbert Xu drop_no_count: 7931da177e4SLinus Torvalds kfree_skb(skb); 7941da177e4SLinus Torvalds return 0; 7951da177e4SLinus Torvalds } 7961da177e4SLinus Torvalds 7974c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, 79895e41e93SYOSHIFUJI Hideaki u8 type, 79995e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 80095e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 80195e41e93SYOSHIFUJI Hideaki int oif) 80295e41e93SYOSHIFUJI Hideaki { 8034c9483b2SDavid S. Miller memset(fl6, 0, sizeof(*fl6)); 8044e3fd7a0SAlexey Dobriyan fl6->saddr = *saddr; 8054e3fd7a0SAlexey Dobriyan fl6->daddr = *daddr; 8064c9483b2SDavid S. Miller fl6->flowi6_proto = IPPROTO_ICMPV6; 8071958b856SDavid S. Miller fl6->fl6_icmp_type = type; 8081958b856SDavid S. Miller fl6->fl6_icmp_code = 0; 8094c9483b2SDavid S. Miller fl6->flowi6_oif = oif; 8104c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); 81195e41e93SYOSHIFUJI Hideaki } 81295e41e93SYOSHIFUJI Hideaki 813640c41c7SIngo Molnar /* 814b7e729c4SDenis V. Lunev * Special lock-class for __icmpv6_sk: 815640c41c7SIngo Molnar */ 816640c41c7SIngo Molnar static struct lock_class_key icmpv6_socket_sk_dst_lock_key; 817640c41c7SIngo Molnar 81898c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 8191da177e4SLinus Torvalds { 8201da177e4SLinus Torvalds struct sock *sk; 8211da177e4SLinus Torvalds int err, i, j; 8221da177e4SLinus Torvalds 82398c6d1b2SDenis V. Lunev net->ipv6.icmp_sk = 82498c6d1b2SDenis V. Lunev kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); 82598c6d1b2SDenis V. Lunev if (net->ipv6.icmp_sk == NULL) 82679c91159SDenis V. Lunev return -ENOMEM; 82779c91159SDenis V. Lunev 8286f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8291ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 8301ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 8311da177e4SLinus Torvalds if (err < 0) { 832f3213831SJoe Perches pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", 8331da177e4SLinus Torvalds err); 8341da177e4SLinus Torvalds goto fail; 8351da177e4SLinus Torvalds } 8361da177e4SLinus Torvalds 8371ed8516fSDenis V. Lunev net->ipv6.icmp_sk[i] = sk; 8385c8cafd6SDenis V. Lunev 839640c41c7SIngo Molnar /* 840640c41c7SIngo Molnar * Split off their lock-class, because sk->sk_dst_lock 841640c41c7SIngo Molnar * gets used from softirqs, which is safe for 842b7e729c4SDenis V. Lunev * __icmpv6_sk (because those never get directly used 843640c41c7SIngo Molnar * via userspace syscalls), but unsafe for normal sockets. 844640c41c7SIngo Molnar */ 845640c41c7SIngo Molnar lockdep_set_class(&sk->sk_dst_lock, 846640c41c7SIngo Molnar &icmpv6_socket_sk_dst_lock_key); 8471da177e4SLinus Torvalds 8481da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 8491da177e4SLinus Torvalds * sk_buff struct overhead. 8501da177e4SLinus Torvalds */ 85187fb4b7bSEric Dumazet sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); 8521da177e4SLinus Torvalds } 8531da177e4SLinus Torvalds return 0; 8541da177e4SLinus Torvalds 8551da177e4SLinus Torvalds fail: 8565c8cafd6SDenis V. Lunev for (j = 0; j < i; j++) 8571ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); 85898c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 8591da177e4SLinus Torvalds return err; 8601da177e4SLinus Torvalds } 8611da177e4SLinus Torvalds 86298c6d1b2SDenis V. Lunev static void __net_exit icmpv6_sk_exit(struct net *net) 8631da177e4SLinus Torvalds { 8641da177e4SLinus Torvalds int i; 8651da177e4SLinus Torvalds 8666f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8671ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); 8681da177e4SLinus Torvalds } 86998c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 87098c6d1b2SDenis V. Lunev } 87198c6d1b2SDenis V. Lunev 8728ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 87398c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 87498c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 87598c6d1b2SDenis V. Lunev }; 87698c6d1b2SDenis V. Lunev 87798c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 87898c6d1b2SDenis V. Lunev { 87998c6d1b2SDenis V. Lunev int err; 88098c6d1b2SDenis V. Lunev 88198c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 88298c6d1b2SDenis V. Lunev if (err < 0) 88398c6d1b2SDenis V. Lunev return err; 88498c6d1b2SDenis V. Lunev 88598c6d1b2SDenis V. Lunev err = -EAGAIN; 88698c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 88798c6d1b2SDenis V. Lunev goto fail; 88898c6d1b2SDenis V. Lunev return 0; 88998c6d1b2SDenis V. Lunev 89098c6d1b2SDenis V. Lunev fail: 891f3213831SJoe Perches pr_err("Failed to register ICMP6 protocol\n"); 89298c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 89398c6d1b2SDenis V. Lunev return err; 89498c6d1b2SDenis V. Lunev } 89598c6d1b2SDenis V. Lunev 8968ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 89798c6d1b2SDenis V. Lunev { 89898c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 8991da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 9001da177e4SLinus Torvalds } 9011da177e4SLinus Torvalds 90298c6d1b2SDenis V. Lunev 9039b5b5cffSArjan van de Ven static const struct icmp6_err { 9041da177e4SLinus Torvalds int err; 9051da177e4SLinus Torvalds int fatal; 9061da177e4SLinus Torvalds } tab_unreach[] = { 9071da177e4SLinus Torvalds { /* NOROUTE */ 9081da177e4SLinus Torvalds .err = ENETUNREACH, 9091da177e4SLinus Torvalds .fatal = 0, 9101da177e4SLinus Torvalds }, 9111da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 9121da177e4SLinus Torvalds .err = EACCES, 9131da177e4SLinus Torvalds .fatal = 1, 9141da177e4SLinus Torvalds }, 9151da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 9161da177e4SLinus Torvalds .err = EHOSTUNREACH, 9171da177e4SLinus Torvalds .fatal = 0, 9181da177e4SLinus Torvalds }, 9191da177e4SLinus Torvalds { /* ADDR_UNREACH */ 9201da177e4SLinus Torvalds .err = EHOSTUNREACH, 9211da177e4SLinus Torvalds .fatal = 0, 9221da177e4SLinus Torvalds }, 9231da177e4SLinus Torvalds { /* PORT_UNREACH */ 9241da177e4SLinus Torvalds .err = ECONNREFUSED, 9251da177e4SLinus Torvalds .fatal = 1, 9261da177e4SLinus Torvalds }, 9271da177e4SLinus Torvalds }; 9281da177e4SLinus Torvalds 929d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 9301da177e4SLinus Torvalds { 9311da177e4SLinus Torvalds int fatal = 0; 9321da177e4SLinus Torvalds 9331da177e4SLinus Torvalds *err = EPROTO; 9341da177e4SLinus Torvalds 9351da177e4SLinus Torvalds switch (type) { 9361da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 9371da177e4SLinus Torvalds fatal = 1; 9381da177e4SLinus Torvalds if (code <= ICMPV6_PORT_UNREACH) { 9391da177e4SLinus Torvalds *err = tab_unreach[code].err; 9401da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 9411da177e4SLinus Torvalds } 9421da177e4SLinus Torvalds break; 9431da177e4SLinus Torvalds 9441da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 9451da177e4SLinus Torvalds *err = EMSGSIZE; 9461da177e4SLinus Torvalds break; 9471da177e4SLinus Torvalds 9481da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 9491da177e4SLinus Torvalds *err = EPROTO; 9501da177e4SLinus Torvalds fatal = 1; 9511da177e4SLinus Torvalds break; 9521da177e4SLinus Torvalds 9531da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 9541da177e4SLinus Torvalds *err = EHOSTUNREACH; 9551da177e4SLinus Torvalds break; 9563ff50b79SStephen Hemminger } 9571da177e4SLinus Torvalds 9581da177e4SLinus Torvalds return fatal; 9591da177e4SLinus Torvalds } 9607159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 9617159039aSYOSHIFUJI Hideaki 9621da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 963760f2d01SDaniel Lezcano ctl_table ipv6_icmp_table_template[] = { 9641da177e4SLinus Torvalds { 9651da177e4SLinus Torvalds .procname = "ratelimit", 96641a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 9671da177e4SLinus Torvalds .maxlen = sizeof(int), 9681da177e4SLinus Torvalds .mode = 0644, 9696d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 9701da177e4SLinus Torvalds }, 971f8572d8fSEric W. Biederman { }, 9721da177e4SLinus Torvalds }; 973760f2d01SDaniel Lezcano 9742c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 975760f2d01SDaniel Lezcano { 976760f2d01SDaniel Lezcano struct ctl_table *table; 977760f2d01SDaniel Lezcano 978760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 979760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 980760f2d01SDaniel Lezcano GFP_KERNEL); 9815ee09105SYOSHIFUJI Hideaki 982c027aab4SEric W. Biederman if (table) 9835ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 9845ee09105SYOSHIFUJI Hideaki 985760f2d01SDaniel Lezcano return table; 986760f2d01SDaniel Lezcano } 9871da177e4SLinus Torvalds #endif 9881da177e4SLinus Torvalds 989