11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * Internet Control Message Protocol (ICMPv6) 31da177e4SLinus Torvalds * Linux INET6 implementation 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Authors: 61da177e4SLinus Torvalds * Pedro Roque <roque@di.fc.ul.pt> 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * Based on net/ipv4/icmp.c 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * RFC 1885 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 131da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 141da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 151da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 161da177e4SLinus Torvalds */ 171da177e4SLinus Torvalds 181da177e4SLinus Torvalds /* 191da177e4SLinus Torvalds * Changes: 201da177e4SLinus Torvalds * 211da177e4SLinus Torvalds * Andi Kleen : exception handling 221da177e4SLinus Torvalds * Andi Kleen add rate limits. never reply to a icmp. 231da177e4SLinus Torvalds * add more length checks and other fixes. 241da177e4SLinus Torvalds * yoshfuji : ensure to sent parameter problem for 251da177e4SLinus Torvalds * fragments. 261da177e4SLinus Torvalds * YOSHIFUJI Hideaki @USAGI: added sysctl for icmp rate limit. 271da177e4SLinus Torvalds * Randy Dunlap and 281da177e4SLinus Torvalds * YOSHIFUJI Hideaki @USAGI: Per-interface statistics support 291da177e4SLinus Torvalds * Kazunori MIYAZAWA @USAGI: change output process to use ip6_append_data 301da177e4SLinus Torvalds */ 311da177e4SLinus Torvalds 321da177e4SLinus Torvalds #include <linux/module.h> 331da177e4SLinus Torvalds #include <linux/errno.h> 341da177e4SLinus Torvalds #include <linux/types.h> 351da177e4SLinus Torvalds #include <linux/socket.h> 361da177e4SLinus Torvalds #include <linux/in.h> 371da177e4SLinus Torvalds #include <linux/kernel.h> 381da177e4SLinus Torvalds #include <linux/sockios.h> 391da177e4SLinus Torvalds #include <linux/net.h> 401da177e4SLinus Torvalds #include <linux/skbuff.h> 411da177e4SLinus Torvalds #include <linux/init.h> 42763ecff1SYasuyuki Kozakai #include <linux/netfilter.h> 435a0e3ad6STejun Heo #include <linux/slab.h> 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 461da177e4SLinus Torvalds #include <linux/sysctl.h> 471da177e4SLinus Torvalds #endif 481da177e4SLinus Torvalds 491da177e4SLinus Torvalds #include <linux/inet.h> 501da177e4SLinus Torvalds #include <linux/netdevice.h> 511da177e4SLinus Torvalds #include <linux/icmpv6.h> 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds #include <net/ip.h> 541da177e4SLinus Torvalds #include <net/sock.h> 551da177e4SLinus Torvalds 561da177e4SLinus Torvalds #include <net/ipv6.h> 571da177e4SLinus Torvalds #include <net/ip6_checksum.h> 581da177e4SLinus Torvalds #include <net/protocol.h> 591da177e4SLinus Torvalds #include <net/raw.h> 601da177e4SLinus Torvalds #include <net/rawv6.h> 611da177e4SLinus Torvalds #include <net/transp_v6.h> 621da177e4SLinus Torvalds #include <net/ip6_route.h> 631da177e4SLinus Torvalds #include <net/addrconf.h> 641da177e4SLinus Torvalds #include <net/icmp.h> 658b7817f3SHerbert Xu #include <net/xfrm.h> 661ed8516fSDenis V. Lunev #include <net/inet_common.h> 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds #include <asm/uaccess.h> 691da177e4SLinus Torvalds #include <asm/system.h> 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds /* 721da177e4SLinus Torvalds * The ICMP socket(s). This is the most convenient way to flow control 731da177e4SLinus Torvalds * our ICMP output as well as maintain a clean interface throughout 741da177e4SLinus Torvalds * all layers. All Socketless IP sends will soon be gone. 751da177e4SLinus Torvalds * 761da177e4SLinus Torvalds * On SMP we have one ICMP socket per-cpu. 771da177e4SLinus Torvalds */ 7898c6d1b2SDenis V. Lunev static inline struct sock *icmpv6_sk(struct net *net) 7998c6d1b2SDenis V. Lunev { 8098c6d1b2SDenis V. Lunev return net->ipv6.icmp_sk[smp_processor_id()]; 8198c6d1b2SDenis V. Lunev } 821da177e4SLinus Torvalds 83e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb); 841da177e4SLinus Torvalds 8541135cc8SAlexey Dobriyan static const struct inet6_protocol icmpv6_protocol = { 861da177e4SLinus Torvalds .handler = icmpv6_rcv, 878b7817f3SHerbert Xu .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 881da177e4SLinus Torvalds }; 891da177e4SLinus Torvalds 90fdc0bde9SDenis V. Lunev static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) 911da177e4SLinus Torvalds { 92fdc0bde9SDenis V. Lunev struct sock *sk; 93fdc0bde9SDenis V. Lunev 941da177e4SLinus Torvalds local_bh_disable(); 951da177e4SLinus Torvalds 96fdc0bde9SDenis V. Lunev sk = icmpv6_sk(net); 97405666dbSDenis V. Lunev if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { 981da177e4SLinus Torvalds /* This can happen if the output path (f.e. SIT or 991da177e4SLinus Torvalds * ip6ip6 tunnel) signals dst_link_failure() for an 1001da177e4SLinus Torvalds * outgoing ICMP6 packet. 1011da177e4SLinus Torvalds */ 1021da177e4SLinus Torvalds local_bh_enable(); 103fdc0bde9SDenis V. Lunev return NULL; 1041da177e4SLinus Torvalds } 105fdc0bde9SDenis V. Lunev return sk; 1061da177e4SLinus Torvalds } 1071da177e4SLinus Torvalds 108405666dbSDenis V. Lunev static __inline__ void icmpv6_xmit_unlock(struct sock *sk) 1091da177e4SLinus Torvalds { 110405666dbSDenis V. Lunev spin_unlock_bh(&sk->sk_lock.slock); 1111da177e4SLinus Torvalds } 1121da177e4SLinus Torvalds 1131da177e4SLinus Torvalds /* 1141da177e4SLinus Torvalds * Slightly more convenient version of icmpv6_send. 1151da177e4SLinus Torvalds */ 116d5fdd6baSBrian Haley void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) 1171da177e4SLinus Torvalds { 1183ffe533cSAlexey Dobriyan icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos); 1191da177e4SLinus Torvalds kfree_skb(skb); 1201da177e4SLinus Torvalds } 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds /* 1231da177e4SLinus Torvalds * Figure out, may we reply to this packet with icmp error. 1241da177e4SLinus Torvalds * 1251da177e4SLinus Torvalds * We do not reply, if: 1261da177e4SLinus Torvalds * - it was icmp error message. 1271da177e4SLinus Torvalds * - it is truncated, so that it is known, that protocol is ICMPV6 1281da177e4SLinus Torvalds * (i.e. in the middle of some exthdr) 1291da177e4SLinus Torvalds * 1301da177e4SLinus Torvalds * --ANK (980726) 1311da177e4SLinus Torvalds */ 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvalds static int is_ineligible(struct sk_buff *skb) 1341da177e4SLinus Torvalds { 1350660e03fSArnaldo Carvalho de Melo int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; 1361da177e4SLinus Torvalds int len = skb->len - ptr; 1370660e03fSArnaldo Carvalho de Melo __u8 nexthdr = ipv6_hdr(skb)->nexthdr; 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds if (len < 0) 1401da177e4SLinus Torvalds return 1; 1411da177e4SLinus Torvalds 1420d3d077cSHerbert Xu ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr); 1431da177e4SLinus Torvalds if (ptr < 0) 1441da177e4SLinus Torvalds return 0; 1451da177e4SLinus Torvalds if (nexthdr == IPPROTO_ICMPV6) { 1461da177e4SLinus Torvalds u8 _type, *tp; 1471da177e4SLinus Torvalds tp = skb_header_pointer(skb, 1481da177e4SLinus Torvalds ptr+offsetof(struct icmp6hdr, icmp6_type), 1491da177e4SLinus Torvalds sizeof(_type), &_type); 1501da177e4SLinus Torvalds if (tp == NULL || 1511da177e4SLinus Torvalds !(*tp & ICMPV6_INFOMSG_MASK)) 1521da177e4SLinus Torvalds return 1; 1531da177e4SLinus Torvalds } 1541da177e4SLinus Torvalds return 0; 1551da177e4SLinus Torvalds } 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds /* 1581da177e4SLinus Torvalds * Check the ICMP output rate limit 1591da177e4SLinus Torvalds */ 16092d86829SDavid S. Miller static inline bool icmpv6_xrlim_allow(struct sock *sk, u8 type, 1611da177e4SLinus Torvalds struct flowi *fl) 1621da177e4SLinus Torvalds { 1631da177e4SLinus Torvalds struct dst_entry *dst; 1643b1e0a65SYOSHIFUJI Hideaki struct net *net = sock_net(sk); 16592d86829SDavid S. Miller bool res = false; 1661da177e4SLinus Torvalds 1671da177e4SLinus Torvalds /* Informational messages are not limited. */ 1681da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 16992d86829SDavid S. Miller return true; 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds /* Do not limit pmtu discovery, it would break it. */ 1721da177e4SLinus Torvalds if (type == ICMPV6_PKT_TOOBIG) 17392d86829SDavid S. Miller return true; 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds /* 1761da177e4SLinus Torvalds * Look up the output route. 1771da177e4SLinus Torvalds * XXX: perhaps the expire for routing entries cloned by 1781da177e4SLinus Torvalds * this lookup should be more aggressive (not longer than timeout). 1791da177e4SLinus Torvalds */ 1809a43b709SBenjamin Thery dst = ip6_route_output(net, sk, fl); 1811da177e4SLinus Torvalds if (dst->error) { 1823bd653c8SDenis V. Lunev IP6_INC_STATS(net, ip6_dst_idev(dst), 183a11d206dSYOSHIFUJI Hideaki IPSTATS_MIB_OUTNOROUTES); 1841da177e4SLinus Torvalds } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { 18592d86829SDavid S. Miller res = true; 1861da177e4SLinus Torvalds } else { 1871da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 1889a43b709SBenjamin Thery int tmo = net->ipv6.sysctl.icmpv6_time; 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds /* Give more bandwidth to wider prefixes. */ 1911da177e4SLinus Torvalds if (rt->rt6i_dst.plen < 128) 1921da177e4SLinus Torvalds tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 1931da177e4SLinus Torvalds 19492d86829SDavid S. Miller if (!rt->rt6i_peer) 19592d86829SDavid S. Miller rt6_bind_peer(rt, 1); 19692d86829SDavid S. Miller res = inet_peer_xrlim_allow(rt->rt6i_peer, tmo); 1971da177e4SLinus Torvalds } 1981da177e4SLinus Torvalds dst_release(dst); 1991da177e4SLinus Torvalds return res; 2001da177e4SLinus Torvalds } 2011da177e4SLinus Torvalds 2021da177e4SLinus Torvalds /* 2031da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2041da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2051da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2061da177e4SLinus Torvalds * highest-order two bits set to 10 2071da177e4SLinus Torvalds */ 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds static __inline__ int opt_unrec(struct sk_buff *skb, __u32 offset) 2101da177e4SLinus Torvalds { 2111da177e4SLinus Torvalds u8 _optval, *op; 2121da177e4SLinus Torvalds 213bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2141da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 2151da177e4SLinus Torvalds if (op == NULL) 2161da177e4SLinus Torvalds return 1; 2171da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2181da177e4SLinus Torvalds } 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds static int icmpv6_push_pending_frames(struct sock *sk, struct flowi *fl, struct icmp6hdr *thdr, int len) 2211da177e4SLinus Torvalds { 2221da177e4SLinus Torvalds struct sk_buff *skb; 2231da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2241da177e4SLinus Torvalds int err = 0; 2251da177e4SLinus Torvalds 2261da177e4SLinus Torvalds if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 2271da177e4SLinus Torvalds goto out; 2281da177e4SLinus Torvalds 229cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2301da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2311da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2321da177e4SLinus Torvalds 2331da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 23407f0757aSJoe Perches skb->csum = csum_partial(icmp6h, 2351da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2361da177e4SLinus Torvalds icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src, 2371da177e4SLinus Torvalds &fl->fl6_dst, 2381da177e4SLinus Torvalds len, fl->proto, 2391da177e4SLinus Torvalds skb->csum); 2401da177e4SLinus Torvalds } else { 241868c86bcSAl Viro __wsum tmp_csum = 0; 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2441da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2451da177e4SLinus Torvalds } 2461da177e4SLinus Torvalds 24707f0757aSJoe Perches tmp_csum = csum_partial(icmp6h, 2481da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 249868c86bcSAl Viro icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src, 2501da177e4SLinus Torvalds &fl->fl6_dst, 251868c86bcSAl Viro len, fl->proto, 252868c86bcSAl Viro tmp_csum); 2531da177e4SLinus Torvalds } 2541da177e4SLinus Torvalds ip6_push_pending_frames(sk); 2551da177e4SLinus Torvalds out: 2561da177e4SLinus Torvalds return err; 2571da177e4SLinus Torvalds } 2581da177e4SLinus Torvalds 2591da177e4SLinus Torvalds struct icmpv6_msg { 2601da177e4SLinus Torvalds struct sk_buff *skb; 2611da177e4SLinus Torvalds int offset; 262763ecff1SYasuyuki Kozakai uint8_t type; 2631da177e4SLinus Torvalds }; 2641da177e4SLinus Torvalds 2651da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 2661da177e4SLinus Torvalds { 2671da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 2681da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 2695f92a738SAl Viro __wsum csum = 0; 2701da177e4SLinus Torvalds 2711da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 2721da177e4SLinus Torvalds to, len, csum); 2731da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 274763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 275763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 2761da177e4SLinus Torvalds return 0; 2771da177e4SLinus Torvalds } 2781da177e4SLinus Torvalds 27959fbb3a6SMasahide NAKAMURA #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 28079383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 28179383236SMasahide NAKAMURA { 2820660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 28379383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 28479383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 28579383236SMasahide NAKAMURA struct in6_addr tmp; 28679383236SMasahide NAKAMURA int off; 28779383236SMasahide NAKAMURA 28879383236SMasahide NAKAMURA if (opt->dsthao) { 28979383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 29079383236SMasahide NAKAMURA if (likely(off >= 0)) { 291d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 292d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 29379383236SMasahide NAKAMURA ipv6_addr_copy(&tmp, &iph->saddr); 29479383236SMasahide NAKAMURA ipv6_addr_copy(&iph->saddr, &hao->addr); 29579383236SMasahide NAKAMURA ipv6_addr_copy(&hao->addr, &tmp); 29679383236SMasahide NAKAMURA } 29779383236SMasahide NAKAMURA } 29879383236SMasahide NAKAMURA } 29979383236SMasahide NAKAMURA #else 30079383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 30179383236SMasahide NAKAMURA #endif 30279383236SMasahide NAKAMURA 303b42835dbSDavid S. Miller static struct dst_entry *icmpv6_route_lookup(struct net *net, struct sk_buff *skb, 304b42835dbSDavid S. Miller struct sock *sk, struct flowi *fl) 305b42835dbSDavid S. Miller { 306b42835dbSDavid S. Miller struct dst_entry *dst, *dst2; 307b42835dbSDavid S. Miller struct flowi fl2; 308b42835dbSDavid S. Miller int err; 309b42835dbSDavid S. Miller 310b42835dbSDavid S. Miller err = ip6_dst_lookup(sk, &dst, fl); 311b42835dbSDavid S. Miller if (err) 312b42835dbSDavid S. Miller return ERR_PTR(err); 313b42835dbSDavid S. Miller 314b42835dbSDavid S. Miller /* 315b42835dbSDavid S. Miller * We won't send icmp if the destination is known 316b42835dbSDavid S. Miller * anycast. 317b42835dbSDavid S. Miller */ 318b42835dbSDavid S. Miller if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { 319b42835dbSDavid S. Miller LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n"); 320b42835dbSDavid S. Miller dst_release(dst); 321b42835dbSDavid S. Miller return ERR_PTR(-EINVAL); 322b42835dbSDavid S. Miller } 323b42835dbSDavid S. Miller 324b42835dbSDavid S. Miller /* No need to clone since we're just using its address. */ 325b42835dbSDavid S. Miller dst2 = dst; 326b42835dbSDavid S. Miller 327452edd59SDavid S. Miller dst = xfrm_lookup(net, dst, fl, sk, 0); 328452edd59SDavid S. Miller if (!IS_ERR(dst)) { 329b42835dbSDavid S. Miller if (dst != dst2) 330b42835dbSDavid S. Miller return dst; 331452edd59SDavid S. Miller } else { 332452edd59SDavid S. Miller if (PTR_ERR(dst) == -EPERM) 333b42835dbSDavid S. Miller dst = NULL; 334452edd59SDavid S. Miller else 335452edd59SDavid S. Miller return dst; 336b42835dbSDavid S. Miller } 337b42835dbSDavid S. Miller 338b42835dbSDavid S. Miller err = xfrm_decode_session_reverse(skb, &fl2, AF_INET6); 339b42835dbSDavid S. Miller if (err) 340b42835dbSDavid S. Miller goto relookup_failed; 341b42835dbSDavid S. Miller 342b42835dbSDavid S. Miller err = ip6_dst_lookup(sk, &dst2, &fl2); 343b42835dbSDavid S. Miller if (err) 344b42835dbSDavid S. Miller goto relookup_failed; 345b42835dbSDavid S. Miller 346452edd59SDavid S. Miller dst2 = xfrm_lookup(net, dst2, &fl2, sk, XFRM_LOOKUP_ICMP); 347452edd59SDavid S. Miller if (!IS_ERR(dst2)) { 348b42835dbSDavid S. Miller dst_release(dst); 349b42835dbSDavid S. Miller dst = dst2; 350452edd59SDavid S. Miller } else { 351452edd59SDavid S. Miller err = PTR_ERR(dst2); 352452edd59SDavid S. Miller if (err == -EPERM) { 353b42835dbSDavid S. Miller dst_release(dst); 354452edd59SDavid S. Miller return dst2; 355452edd59SDavid S. Miller } else 356b42835dbSDavid S. Miller goto relookup_failed; 357b42835dbSDavid S. Miller } 358b42835dbSDavid S. Miller 359b42835dbSDavid S. Miller relookup_failed: 360b42835dbSDavid S. Miller if (dst) 361b42835dbSDavid S. Miller return dst; 362b42835dbSDavid S. Miller return ERR_PTR(err); 363b42835dbSDavid S. Miller } 364b42835dbSDavid S. Miller 3651da177e4SLinus Torvalds /* 3661da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 3671da177e4SLinus Torvalds */ 3683ffe533cSAlexey Dobriyan void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info) 3691da177e4SLinus Torvalds { 370c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 3711da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 3720660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 37384427d53SYOSHIFUJI Hideaki struct sock *sk; 37484427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 3751da177e4SLinus Torvalds struct in6_addr *saddr = NULL; 3761da177e4SLinus Torvalds struct dst_entry *dst; 3771da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 3781da177e4SLinus Torvalds struct flowi fl; 3791da177e4SLinus Torvalds struct icmpv6_msg msg; 3801da177e4SLinus Torvalds int iif = 0; 3811da177e4SLinus Torvalds int addr_type = 0; 3821da177e4SLinus Torvalds int len; 383e651f03aSGerrit Renker int hlimit; 3841da177e4SLinus Torvalds int err = 0; 3851da177e4SLinus Torvalds 38627a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 38727a884dcSArnaldo Carvalho de Melo (skb->network_header + sizeof(*hdr)) > skb->tail) 3881da177e4SLinus Torvalds return; 3891da177e4SLinus Torvalds 3901da177e4SLinus Torvalds /* 3911da177e4SLinus Torvalds * Make sure we respect the rules 3921da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 3931da177e4SLinus Torvalds * Rule (e.1) is enforced by not using icmpv6_send 3941da177e4SLinus Torvalds * in any code that processes icmp errors. 3951da177e4SLinus Torvalds */ 3961da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 3971da177e4SLinus Torvalds 3989a43b709SBenjamin Thery if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0)) 3991da177e4SLinus Torvalds saddr = &hdr->daddr; 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds /* 4021da177e4SLinus Torvalds * Dest addr check 4031da177e4SLinus Torvalds */ 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) { 4061da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 4071da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 4081da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 4091da177e4SLinus Torvalds (opt_unrec(skb, info)))) 4101da177e4SLinus Torvalds return; 4111da177e4SLinus Torvalds 4121da177e4SLinus Torvalds saddr = NULL; 4131da177e4SLinus Torvalds } 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds /* 4181da177e4SLinus Torvalds * Source addr check 4191da177e4SLinus Torvalds */ 4201da177e4SLinus Torvalds 4211da177e4SLinus Torvalds if (addr_type & IPV6_ADDR_LINKLOCAL) 4221da177e4SLinus Torvalds iif = skb->dev->ifindex; 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds /* 4258de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 4268de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 4278de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 4288de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 4291da177e4SLinus Torvalds */ 4301da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 43164ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n"); 4321da177e4SLinus Torvalds return; 4331da177e4SLinus Torvalds } 4341da177e4SLinus Torvalds 4351da177e4SLinus Torvalds /* 4361da177e4SLinus Torvalds * Never answer to a ICMP packet. 4371da177e4SLinus Torvalds */ 4381da177e4SLinus Torvalds if (is_ineligible(skb)) { 43964ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n"); 4401da177e4SLinus Torvalds return; 4411da177e4SLinus Torvalds } 4421da177e4SLinus Torvalds 44379383236SMasahide NAKAMURA mip6_addr_swap(skb); 44479383236SMasahide NAKAMURA 4451da177e4SLinus Torvalds memset(&fl, 0, sizeof(fl)); 4461da177e4SLinus Torvalds fl.proto = IPPROTO_ICMPV6; 4471da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_dst, &hdr->saddr); 4481da177e4SLinus Torvalds if (saddr) 4491da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_src, saddr); 4501da177e4SLinus Torvalds fl.oif = iif; 4511da177e4SLinus Torvalds fl.fl_icmp_type = type; 4521da177e4SLinus Torvalds fl.fl_icmp_code = code; 453beb8d13bSVenkat Yekkirala security_skb_classify_flow(skb, &fl); 4541da177e4SLinus Torvalds 455fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 456fdc0bde9SDenis V. Lunev if (sk == NULL) 457405666dbSDenis V. Lunev return; 458fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 459405666dbSDenis V. Lunev 4601da177e4SLinus Torvalds if (!icmpv6_xrlim_allow(sk, type, &fl)) 4611da177e4SLinus Torvalds goto out; 4621da177e4SLinus Torvalds 4631da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 4641da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 4651da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 4661da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 4671da177e4SLinus Torvalds 4681da177e4SLinus Torvalds if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 4691da177e4SLinus Torvalds fl.oif = np->mcast_oif; 4701da177e4SLinus Torvalds 471b42835dbSDavid S. Miller dst = icmpv6_route_lookup(net, skb, sk, &fl); 472b42835dbSDavid S. Miller if (IS_ERR(dst)) 4731da177e4SLinus Torvalds goto out; 4748de3351eSYOSHIFUJI Hideaki 4751da177e4SLinus Torvalds if (ipv6_addr_is_multicast(&fl.fl6_dst)) 4761da177e4SLinus Torvalds hlimit = np->mcast_hops; 4771da177e4SLinus Torvalds else 4781da177e4SLinus Torvalds hlimit = np->hop_limit; 4791da177e4SLinus Torvalds if (hlimit < 0) 4806b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 4811da177e4SLinus Torvalds 4821da177e4SLinus Torvalds msg.skb = skb; 483bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 484763ecff1SYasuyuki Kozakai msg.type = type; 4851da177e4SLinus Torvalds 4861da177e4SLinus Torvalds len = skb->len - msg.offset; 4871da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); 4881da177e4SLinus Torvalds if (len < 0) { 48964ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n"); 4901da177e4SLinus Torvalds goto out_dst_release; 4911da177e4SLinus Torvalds } 4921da177e4SLinus Torvalds 4931da177e4SLinus Torvalds idev = in6_dev_get(skb->dev); 4941da177e4SLinus Torvalds 4951da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, 4961da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 497e651f03aSGerrit Renker sizeof(struct icmp6hdr), hlimit, 498e651f03aSGerrit Renker np->tclass, NULL, &fl, (struct rt6_info*)dst, 49913b52cd4SBrian Haley MSG_DONTWAIT, np->dontfrag); 5001da177e4SLinus Torvalds if (err) { 50100d9d6a1SEric Dumazet ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS); 5021da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 5031da177e4SLinus Torvalds goto out_put; 5041da177e4SLinus Torvalds } 5051da177e4SLinus Torvalds err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, len + sizeof(struct icmp6hdr)); 5061da177e4SLinus Torvalds 5071da177e4SLinus Torvalds out_put: 5081da177e4SLinus Torvalds if (likely(idev != NULL)) 5091da177e4SLinus Torvalds in6_dev_put(idev); 5101da177e4SLinus Torvalds out_dst_release: 5111da177e4SLinus Torvalds dst_release(dst); 5121da177e4SLinus Torvalds out: 513405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5141da177e4SLinus Torvalds } 5151da177e4SLinus Torvalds 5167159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_send); 5177159039aSYOSHIFUJI Hideaki 5181da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 5191da177e4SLinus Torvalds { 520c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 52184427d53SYOSHIFUJI Hideaki struct sock *sk; 5221da177e4SLinus Torvalds struct inet6_dev *idev; 52384427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 5241da177e4SLinus Torvalds struct in6_addr *saddr = NULL; 525cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 5261da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 5271da177e4SLinus Torvalds struct flowi fl; 5281da177e4SLinus Torvalds struct icmpv6_msg msg; 5291da177e4SLinus Torvalds struct dst_entry *dst; 5301da177e4SLinus Torvalds int err = 0; 5311da177e4SLinus Torvalds int hlimit; 5321da177e4SLinus Torvalds 5330660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 5341da177e4SLinus Torvalds 5351da177e4SLinus Torvalds if (!ipv6_unicast_destination(skb)) 5361da177e4SLinus Torvalds saddr = NULL; 5371da177e4SLinus Torvalds 5381da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 5391da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 5401da177e4SLinus Torvalds 5411da177e4SLinus Torvalds memset(&fl, 0, sizeof(fl)); 5421da177e4SLinus Torvalds fl.proto = IPPROTO_ICMPV6; 5430660e03fSArnaldo Carvalho de Melo ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); 5441da177e4SLinus Torvalds if (saddr) 5451da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_src, saddr); 5461da177e4SLinus Torvalds fl.oif = skb->dev->ifindex; 5471da177e4SLinus Torvalds fl.fl_icmp_type = ICMPV6_ECHO_REPLY; 548beb8d13bSVenkat Yekkirala security_skb_classify_flow(skb, &fl); 5491da177e4SLinus Torvalds 550fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 551fdc0bde9SDenis V. Lunev if (sk == NULL) 552405666dbSDenis V. Lunev return; 553fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 554405666dbSDenis V. Lunev 5551da177e4SLinus Torvalds if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 5561da177e4SLinus Torvalds fl.oif = np->mcast_oif; 5571da177e4SLinus Torvalds 5581da177e4SLinus Torvalds err = ip6_dst_lookup(sk, &dst, &fl); 5591da177e4SLinus Torvalds if (err) 5601da177e4SLinus Torvalds goto out; 561452edd59SDavid S. Miller dst = xfrm_lookup(net, dst, &fl, sk, 0); 562452edd59SDavid S. Miller if (IS_ERR(dst)) 563e104411bSPatrick McHardy goto out; 5641da177e4SLinus Torvalds 5651da177e4SLinus Torvalds if (ipv6_addr_is_multicast(&fl.fl6_dst)) 5661da177e4SLinus Torvalds hlimit = np->mcast_hops; 5671da177e4SLinus Torvalds else 5681da177e4SLinus Torvalds hlimit = np->hop_limit; 5691da177e4SLinus Torvalds if (hlimit < 0) 5706b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 5711da177e4SLinus Torvalds 5721da177e4SLinus Torvalds idev = in6_dev_get(skb->dev); 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds msg.skb = skb; 5751da177e4SLinus Torvalds msg.offset = 0; 576763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 5771da177e4SLinus Torvalds 5781da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 579e651f03aSGerrit Renker sizeof(struct icmp6hdr), hlimit, np->tclass, NULL, &fl, 58013b52cd4SBrian Haley (struct rt6_info*)dst, MSG_DONTWAIT, 58113b52cd4SBrian Haley np->dontfrag); 5821da177e4SLinus Torvalds 5831da177e4SLinus Torvalds if (err) { 58400d9d6a1SEric Dumazet ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS); 5851da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 5861da177e4SLinus Torvalds goto out_put; 5871da177e4SLinus Torvalds } 5881da177e4SLinus Torvalds err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, skb->len + sizeof(struct icmp6hdr)); 5891da177e4SLinus Torvalds 5901da177e4SLinus Torvalds out_put: 5911da177e4SLinus Torvalds if (likely(idev != NULL)) 5921da177e4SLinus Torvalds in6_dev_put(idev); 5931da177e4SLinus Torvalds dst_release(dst); 5941da177e4SLinus Torvalds out: 595405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5961da177e4SLinus Torvalds } 5971da177e4SLinus Torvalds 598d5fdd6baSBrian Haley static void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 5991da177e4SLinus Torvalds { 60041135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 6011da177e4SLinus Torvalds int inner_offset; 6021da177e4SLinus Torvalds int hash; 6031da177e4SLinus Torvalds u8 nexthdr; 6041da177e4SLinus Torvalds 6051da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 6061da177e4SLinus Torvalds return; 6071da177e4SLinus Torvalds 6081da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 6091da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 6101da177e4SLinus Torvalds /* now skip over extension headers */ 6110d3d077cSHerbert Xu inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr); 6121da177e4SLinus Torvalds if (inner_offset<0) 6131da177e4SLinus Torvalds return; 6141da177e4SLinus Torvalds } else { 6151da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 6161da177e4SLinus Torvalds } 6171da177e4SLinus Torvalds 6181da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 6191da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 6201da177e4SLinus Torvalds return; 6211da177e4SLinus Torvalds 6221da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 6231da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 6241da177e4SLinus Torvalds pmtu discovery. 6251da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 6261da177e4SLinus Torvalds --ANK (980726) 6271da177e4SLinus Torvalds */ 6281da177e4SLinus Torvalds 6291da177e4SLinus Torvalds hash = nexthdr & (MAX_INET_PROTOS - 1); 6301da177e4SLinus Torvalds 6311da177e4SLinus Torvalds rcu_read_lock(); 6321da177e4SLinus Torvalds ipprot = rcu_dereference(inet6_protos[hash]); 6331da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 6341da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 6351da177e4SLinus Torvalds rcu_read_unlock(); 6361da177e4SLinus Torvalds 63769d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 6381da177e4SLinus Torvalds } 6391da177e4SLinus Torvalds 6401da177e4SLinus Torvalds /* 6411da177e4SLinus Torvalds * Handle icmp messages 6421da177e4SLinus Torvalds */ 6431da177e4SLinus Torvalds 644e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 6451da177e4SLinus Torvalds { 6461da177e4SLinus Torvalds struct net_device *dev = skb->dev; 6471da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 6481da177e4SLinus Torvalds struct in6_addr *saddr, *daddr; 6491da177e4SLinus Torvalds struct ipv6hdr *orig_hdr; 6501da177e4SLinus Torvalds struct icmp6hdr *hdr; 651d5fdd6baSBrian Haley u8 type; 6521da177e4SLinus Torvalds 653aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 654def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 6558b7817f3SHerbert Xu int nh; 6568b7817f3SHerbert Xu 657def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 658aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 659aebcf82cSHerbert Xu goto drop_no_count; 660aebcf82cSHerbert Xu 6618b7817f3SHerbert Xu if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(*orig_hdr))) 6628b7817f3SHerbert Xu goto drop_no_count; 6638b7817f3SHerbert Xu 6648b7817f3SHerbert Xu nh = skb_network_offset(skb); 6658b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 6668b7817f3SHerbert Xu 6678b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 6688b7817f3SHerbert Xu goto drop_no_count; 6698b7817f3SHerbert Xu 6708b7817f3SHerbert Xu skb_set_network_header(skb, nh); 6718b7817f3SHerbert Xu } 6728b7817f3SHerbert Xu 673e41b5368SDenis V. Lunev ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INMSGS); 6741da177e4SLinus Torvalds 6750660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 6760660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 6771da177e4SLinus Torvalds 6781da177e4SLinus Torvalds /* Perform checksum. */ 679fb286bb2SHerbert Xu switch (skb->ip_summed) { 68084fa7933SPatrick McHardy case CHECKSUM_COMPLETE: 681fb286bb2SHerbert Xu if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, 682fb286bb2SHerbert Xu skb->csum)) 683fb286bb2SHerbert Xu break; 684fb286bb2SHerbert Xu /* fall through */ 685fb286bb2SHerbert Xu case CHECKSUM_NONE: 686868c86bcSAl Viro skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len, 687868c86bcSAl Viro IPPROTO_ICMPV6, 0)); 688fb286bb2SHerbert Xu if (__skb_checksum_complete(skb)) { 6895b095d98SHarvey Harrison LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [%pI6 > %pI6]\n", 6900c6ce78aSHarvey Harrison saddr, daddr); 6911da177e4SLinus Torvalds goto discard_it; 6921da177e4SLinus Torvalds } 6931da177e4SLinus Torvalds } 6941da177e4SLinus Torvalds 6958cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 6968cf22943SHerbert Xu goto discard_it; 6971da177e4SLinus Torvalds 698cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 6991da177e4SLinus Torvalds 7001da177e4SLinus Torvalds type = hdr->icmp6_type; 7011da177e4SLinus Torvalds 70255d43808SDenis V. Lunev ICMP6MSGIN_INC_STATS_BH(dev_net(dev), idev, type); 7031da177e4SLinus Torvalds 7041da177e4SLinus Torvalds switch (type) { 7051da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 7061da177e4SLinus Torvalds icmpv6_echo_reply(skb); 7071da177e4SLinus Torvalds break; 7081da177e4SLinus Torvalds 7091da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 7101da177e4SLinus Torvalds /* we couldn't care less */ 7111da177e4SLinus Torvalds break; 7121da177e4SLinus Torvalds 7131da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 7141da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 7151da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 7161da177e4SLinus Torvalds destination cache will allow to solve this problem 7171da177e4SLinus Torvalds --ANK (980726) 7181da177e4SLinus Torvalds */ 7191da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 7201da177e4SLinus Torvalds goto discard_it; 721cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 7221da177e4SLinus Torvalds orig_hdr = (struct ipv6hdr *) (hdr + 1); 7231da177e4SLinus Torvalds rt6_pmtu_discovery(&orig_hdr->daddr, &orig_hdr->saddr, dev, 7241da177e4SLinus Torvalds ntohl(hdr->icmp6_mtu)); 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds /* 7271da177e4SLinus Torvalds * Drop through to notify 7281da177e4SLinus Torvalds */ 7291da177e4SLinus Torvalds 7301da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 7311da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 7321da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 7331da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7341da177e4SLinus Torvalds break; 7351da177e4SLinus Torvalds 7361da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 7371da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 7381da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 7391da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 7401da177e4SLinus Torvalds case NDISC_REDIRECT: 7411da177e4SLinus Torvalds ndisc_rcv(skb); 7421da177e4SLinus Torvalds break; 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 7451da177e4SLinus Torvalds igmp6_event_query(skb); 7461da177e4SLinus Torvalds break; 7471da177e4SLinus Torvalds 7481da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 7491da177e4SLinus Torvalds igmp6_event_report(skb); 7501da177e4SLinus Torvalds break; 7511da177e4SLinus Torvalds 7521da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 7531da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 7541da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 7551da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 7561da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 7571da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 7581da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 7591da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 7601da177e4SLinus Torvalds break; 7611da177e4SLinus Torvalds 7621da177e4SLinus Torvalds default: 76364ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n"); 7641da177e4SLinus Torvalds 7651da177e4SLinus Torvalds /* informational */ 7661da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 7671da177e4SLinus Torvalds break; 7681da177e4SLinus Torvalds 7691da177e4SLinus Torvalds /* 7701da177e4SLinus Torvalds * error of unknown type. 7711da177e4SLinus Torvalds * must pass to upper level 7721da177e4SLinus Torvalds */ 7731da177e4SLinus Torvalds 7741da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7753ff50b79SStephen Hemminger } 7763ff50b79SStephen Hemminger 7771da177e4SLinus Torvalds kfree_skb(skb); 7781da177e4SLinus Torvalds return 0; 7791da177e4SLinus Torvalds 7801da177e4SLinus Torvalds discard_it: 781e41b5368SDenis V. Lunev ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INERRORS); 7828b7817f3SHerbert Xu drop_no_count: 7831da177e4SLinus Torvalds kfree_skb(skb); 7841da177e4SLinus Torvalds return 0; 7851da177e4SLinus Torvalds } 7861da177e4SLinus Torvalds 78795e41e93SYOSHIFUJI Hideaki void icmpv6_flow_init(struct sock *sk, struct flowi *fl, 78895e41e93SYOSHIFUJI Hideaki u8 type, 78995e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 79095e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 79195e41e93SYOSHIFUJI Hideaki int oif) 79295e41e93SYOSHIFUJI Hideaki { 79395e41e93SYOSHIFUJI Hideaki memset(fl, 0, sizeof(*fl)); 79495e41e93SYOSHIFUJI Hideaki ipv6_addr_copy(&fl->fl6_src, saddr); 79595e41e93SYOSHIFUJI Hideaki ipv6_addr_copy(&fl->fl6_dst, daddr); 79695e41e93SYOSHIFUJI Hideaki fl->proto = IPPROTO_ICMPV6; 79795e41e93SYOSHIFUJI Hideaki fl->fl_icmp_type = type; 79895e41e93SYOSHIFUJI Hideaki fl->fl_icmp_code = 0; 79995e41e93SYOSHIFUJI Hideaki fl->oif = oif; 80095e41e93SYOSHIFUJI Hideaki security_sk_classify_flow(sk, fl); 80195e41e93SYOSHIFUJI Hideaki } 80295e41e93SYOSHIFUJI Hideaki 803640c41c7SIngo Molnar /* 804b7e729c4SDenis V. Lunev * Special lock-class for __icmpv6_sk: 805640c41c7SIngo Molnar */ 806640c41c7SIngo Molnar static struct lock_class_key icmpv6_socket_sk_dst_lock_key; 807640c41c7SIngo Molnar 80898c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 8091da177e4SLinus Torvalds { 8101da177e4SLinus Torvalds struct sock *sk; 8111da177e4SLinus Torvalds int err, i, j; 8121da177e4SLinus Torvalds 81398c6d1b2SDenis V. Lunev net->ipv6.icmp_sk = 81498c6d1b2SDenis V. Lunev kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); 81598c6d1b2SDenis V. Lunev if (net->ipv6.icmp_sk == NULL) 81679c91159SDenis V. Lunev return -ENOMEM; 81779c91159SDenis V. Lunev 8186f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8191ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 8201ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 8211da177e4SLinus Torvalds if (err < 0) { 8221da177e4SLinus Torvalds printk(KERN_ERR 8231da177e4SLinus Torvalds "Failed to initialize the ICMP6 control socket " 8241da177e4SLinus Torvalds "(err %d).\n", 8251da177e4SLinus Torvalds err); 8261da177e4SLinus Torvalds goto fail; 8271da177e4SLinus Torvalds } 8281da177e4SLinus Torvalds 8291ed8516fSDenis V. Lunev net->ipv6.icmp_sk[i] = sk; 8305c8cafd6SDenis V. Lunev 831640c41c7SIngo Molnar /* 832640c41c7SIngo Molnar * Split off their lock-class, because sk->sk_dst_lock 833640c41c7SIngo Molnar * gets used from softirqs, which is safe for 834b7e729c4SDenis V. Lunev * __icmpv6_sk (because those never get directly used 835640c41c7SIngo Molnar * via userspace syscalls), but unsafe for normal sockets. 836640c41c7SIngo Molnar */ 837640c41c7SIngo Molnar lockdep_set_class(&sk->sk_dst_lock, 838640c41c7SIngo Molnar &icmpv6_socket_sk_dst_lock_key); 8391da177e4SLinus Torvalds 8401da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 8411da177e4SLinus Torvalds * sk_buff struct overhead. 8421da177e4SLinus Torvalds */ 8431da177e4SLinus Torvalds sk->sk_sndbuf = 8441da177e4SLinus Torvalds (2 * ((64 * 1024) + sizeof(struct sk_buff))); 8451da177e4SLinus Torvalds } 8461da177e4SLinus Torvalds return 0; 8471da177e4SLinus Torvalds 8481da177e4SLinus Torvalds fail: 8495c8cafd6SDenis V. Lunev for (j = 0; j < i; j++) 8501ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); 85198c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 8521da177e4SLinus Torvalds return err; 8531da177e4SLinus Torvalds } 8541da177e4SLinus Torvalds 85598c6d1b2SDenis V. Lunev static void __net_exit icmpv6_sk_exit(struct net *net) 8561da177e4SLinus Torvalds { 8571da177e4SLinus Torvalds int i; 8581da177e4SLinus Torvalds 8596f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8601ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); 8611da177e4SLinus Torvalds } 86298c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 86398c6d1b2SDenis V. Lunev } 86498c6d1b2SDenis V. Lunev 8658ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 86698c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 86798c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 86898c6d1b2SDenis V. Lunev }; 86998c6d1b2SDenis V. Lunev 87098c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 87198c6d1b2SDenis V. Lunev { 87298c6d1b2SDenis V. Lunev int err; 87398c6d1b2SDenis V. Lunev 87498c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 87598c6d1b2SDenis V. Lunev if (err < 0) 87698c6d1b2SDenis V. Lunev return err; 87798c6d1b2SDenis V. Lunev 87898c6d1b2SDenis V. Lunev err = -EAGAIN; 87998c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 88098c6d1b2SDenis V. Lunev goto fail; 88198c6d1b2SDenis V. Lunev return 0; 88298c6d1b2SDenis V. Lunev 88398c6d1b2SDenis V. Lunev fail: 88498c6d1b2SDenis V. Lunev printk(KERN_ERR "Failed to register ICMP6 protocol\n"); 88598c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 88698c6d1b2SDenis V. Lunev return err; 88798c6d1b2SDenis V. Lunev } 88898c6d1b2SDenis V. Lunev 8898ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 89098c6d1b2SDenis V. Lunev { 89198c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 8921da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 8931da177e4SLinus Torvalds } 8941da177e4SLinus Torvalds 89598c6d1b2SDenis V. Lunev 8969b5b5cffSArjan van de Ven static const struct icmp6_err { 8971da177e4SLinus Torvalds int err; 8981da177e4SLinus Torvalds int fatal; 8991da177e4SLinus Torvalds } tab_unreach[] = { 9001da177e4SLinus Torvalds { /* NOROUTE */ 9011da177e4SLinus Torvalds .err = ENETUNREACH, 9021da177e4SLinus Torvalds .fatal = 0, 9031da177e4SLinus Torvalds }, 9041da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 9051da177e4SLinus Torvalds .err = EACCES, 9061da177e4SLinus Torvalds .fatal = 1, 9071da177e4SLinus Torvalds }, 9081da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 9091da177e4SLinus Torvalds .err = EHOSTUNREACH, 9101da177e4SLinus Torvalds .fatal = 0, 9111da177e4SLinus Torvalds }, 9121da177e4SLinus Torvalds { /* ADDR_UNREACH */ 9131da177e4SLinus Torvalds .err = EHOSTUNREACH, 9141da177e4SLinus Torvalds .fatal = 0, 9151da177e4SLinus Torvalds }, 9161da177e4SLinus Torvalds { /* PORT_UNREACH */ 9171da177e4SLinus Torvalds .err = ECONNREFUSED, 9181da177e4SLinus Torvalds .fatal = 1, 9191da177e4SLinus Torvalds }, 9201da177e4SLinus Torvalds }; 9211da177e4SLinus Torvalds 922d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 9231da177e4SLinus Torvalds { 9241da177e4SLinus Torvalds int fatal = 0; 9251da177e4SLinus Torvalds 9261da177e4SLinus Torvalds *err = EPROTO; 9271da177e4SLinus Torvalds 9281da177e4SLinus Torvalds switch (type) { 9291da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 9301da177e4SLinus Torvalds fatal = 1; 9311da177e4SLinus Torvalds if (code <= ICMPV6_PORT_UNREACH) { 9321da177e4SLinus Torvalds *err = tab_unreach[code].err; 9331da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 9341da177e4SLinus Torvalds } 9351da177e4SLinus Torvalds break; 9361da177e4SLinus Torvalds 9371da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 9381da177e4SLinus Torvalds *err = EMSGSIZE; 9391da177e4SLinus Torvalds break; 9401da177e4SLinus Torvalds 9411da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 9421da177e4SLinus Torvalds *err = EPROTO; 9431da177e4SLinus Torvalds fatal = 1; 9441da177e4SLinus Torvalds break; 9451da177e4SLinus Torvalds 9461da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 9471da177e4SLinus Torvalds *err = EHOSTUNREACH; 9481da177e4SLinus Torvalds break; 9493ff50b79SStephen Hemminger } 9501da177e4SLinus Torvalds 9511da177e4SLinus Torvalds return fatal; 9521da177e4SLinus Torvalds } 9531da177e4SLinus Torvalds 9547159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 9557159039aSYOSHIFUJI Hideaki 9561da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 957760f2d01SDaniel Lezcano ctl_table ipv6_icmp_table_template[] = { 9581da177e4SLinus Torvalds { 9591da177e4SLinus Torvalds .procname = "ratelimit", 96041a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 9611da177e4SLinus Torvalds .maxlen = sizeof(int), 9621da177e4SLinus Torvalds .mode = 0644, 9636d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 9641da177e4SLinus Torvalds }, 965f8572d8fSEric W. Biederman { }, 9661da177e4SLinus Torvalds }; 967760f2d01SDaniel Lezcano 9682c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 969760f2d01SDaniel Lezcano { 970760f2d01SDaniel Lezcano struct ctl_table *table; 971760f2d01SDaniel Lezcano 972760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 973760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 974760f2d01SDaniel Lezcano GFP_KERNEL); 9755ee09105SYOSHIFUJI Hideaki 9765ee09105SYOSHIFUJI Hideaki if (table) 9775ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 9785ee09105SYOSHIFUJI Hideaki 979760f2d01SDaniel Lezcano return table; 980760f2d01SDaniel Lezcano } 9811da177e4SLinus Torvalds #endif 9821da177e4SLinus Torvalds 983