11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * Internet Control Message Protocol (ICMPv6) 31da177e4SLinus Torvalds * Linux INET6 implementation 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Authors: 61da177e4SLinus Torvalds * Pedro Roque <roque@di.fc.ul.pt> 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * Based on net/ipv4/icmp.c 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * RFC 1885 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 131da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 141da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 151da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 161da177e4SLinus Torvalds */ 171da177e4SLinus Torvalds 181da177e4SLinus Torvalds /* 191da177e4SLinus Torvalds * Changes: 201da177e4SLinus Torvalds * 211da177e4SLinus Torvalds * Andi Kleen : exception handling 221da177e4SLinus Torvalds * Andi Kleen add rate limits. never reply to a icmp. 231da177e4SLinus Torvalds * add more length checks and other fixes. 241da177e4SLinus Torvalds * yoshfuji : ensure to sent parameter problem for 251da177e4SLinus Torvalds * fragments. 261da177e4SLinus Torvalds * YOSHIFUJI Hideaki @USAGI: added sysctl for icmp rate limit. 271da177e4SLinus Torvalds * Randy Dunlap and 281da177e4SLinus Torvalds * YOSHIFUJI Hideaki @USAGI: Per-interface statistics support 291da177e4SLinus Torvalds * Kazunori MIYAZAWA @USAGI: change output process to use ip6_append_data 301da177e4SLinus Torvalds */ 311da177e4SLinus Torvalds 32f3213831SJoe Perches #define pr_fmt(fmt) "IPv6: " fmt 33f3213831SJoe Perches 341da177e4SLinus Torvalds #include <linux/module.h> 351da177e4SLinus Torvalds #include <linux/errno.h> 361da177e4SLinus Torvalds #include <linux/types.h> 371da177e4SLinus Torvalds #include <linux/socket.h> 381da177e4SLinus Torvalds #include <linux/in.h> 391da177e4SLinus Torvalds #include <linux/kernel.h> 401da177e4SLinus Torvalds #include <linux/sockios.h> 411da177e4SLinus Torvalds #include <linux/net.h> 421da177e4SLinus Torvalds #include <linux/skbuff.h> 431da177e4SLinus Torvalds #include <linux/init.h> 44763ecff1SYasuyuki Kozakai #include <linux/netfilter.h> 455a0e3ad6STejun Heo #include <linux/slab.h> 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 481da177e4SLinus Torvalds #include <linux/sysctl.h> 491da177e4SLinus Torvalds #endif 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds #include <linux/inet.h> 521da177e4SLinus Torvalds #include <linux/netdevice.h> 531da177e4SLinus Torvalds #include <linux/icmpv6.h> 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds #include <net/ip.h> 561da177e4SLinus Torvalds #include <net/sock.h> 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds #include <net/ipv6.h> 591da177e4SLinus Torvalds #include <net/ip6_checksum.h> 606d0bfe22SLorenzo Colitti #include <net/ping.h> 611da177e4SLinus Torvalds #include <net/protocol.h> 621da177e4SLinus Torvalds #include <net/raw.h> 631da177e4SLinus Torvalds #include <net/rawv6.h> 641da177e4SLinus Torvalds #include <net/transp_v6.h> 651da177e4SLinus Torvalds #include <net/ip6_route.h> 661da177e4SLinus Torvalds #include <net/addrconf.h> 671da177e4SLinus Torvalds #include <net/icmp.h> 688b7817f3SHerbert Xu #include <net/xfrm.h> 691ed8516fSDenis V. Lunev #include <net/inet_common.h> 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds #include <asm/uaccess.h> 721da177e4SLinus Torvalds 731da177e4SLinus Torvalds /* 741da177e4SLinus Torvalds * The ICMP socket(s). This is the most convenient way to flow control 751da177e4SLinus Torvalds * our ICMP output as well as maintain a clean interface throughout 761da177e4SLinus Torvalds * all layers. All Socketless IP sends will soon be gone. 771da177e4SLinus Torvalds * 781da177e4SLinus Torvalds * On SMP we have one ICMP socket per-cpu. 791da177e4SLinus Torvalds */ 8098c6d1b2SDenis V. Lunev static inline struct sock *icmpv6_sk(struct net *net) 8198c6d1b2SDenis V. Lunev { 8298c6d1b2SDenis V. Lunev return net->ipv6.icmp_sk[smp_processor_id()]; 8398c6d1b2SDenis V. Lunev } 841da177e4SLinus Torvalds 856f809da2SSteffen Klassert static void icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 866f809da2SSteffen Klassert u8 type, u8 code, int offset, __be32 info) 876f809da2SSteffen Klassert { 886d0bfe22SLorenzo Colitti /* icmpv6_notify checks 8 bytes can be pulled, icmp6hdr is 8 bytes */ 896d0bfe22SLorenzo Colitti struct icmp6hdr *icmp6 = (struct icmp6hdr *) (skb->data + offset); 906f809da2SSteffen Klassert struct net *net = dev_net(skb->dev); 916f809da2SSteffen Klassert 926f809da2SSteffen Klassert if (type == ICMPV6_PKT_TOOBIG) 936f809da2SSteffen Klassert ip6_update_pmtu(skb, net, info, 0, 0); 946f809da2SSteffen Klassert else if (type == NDISC_REDIRECT) 95b55b76b2SDuan Jiong ip6_redirect(skb, net, skb->dev->ifindex, 0); 966d0bfe22SLorenzo Colitti 976d0bfe22SLorenzo Colitti if (!(type & ICMPV6_INFOMSG_MASK)) 986d0bfe22SLorenzo Colitti if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST) 996d0bfe22SLorenzo Colitti ping_err(skb, offset, info); 1006f809da2SSteffen Klassert } 1016f809da2SSteffen Klassert 102e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb); 1031da177e4SLinus Torvalds 10441135cc8SAlexey Dobriyan static const struct inet6_protocol icmpv6_protocol = { 1051da177e4SLinus Torvalds .handler = icmpv6_rcv, 1066f809da2SSteffen Klassert .err_handler = icmpv6_err, 1078b7817f3SHerbert Xu .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1081da177e4SLinus Torvalds }; 1091da177e4SLinus Torvalds 110fdc0bde9SDenis V. Lunev static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) 1111da177e4SLinus Torvalds { 112fdc0bde9SDenis V. Lunev struct sock *sk; 113fdc0bde9SDenis V. Lunev 1141da177e4SLinus Torvalds local_bh_disable(); 1151da177e4SLinus Torvalds 116fdc0bde9SDenis V. Lunev sk = icmpv6_sk(net); 117405666dbSDenis V. Lunev if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { 1181da177e4SLinus Torvalds /* This can happen if the output path (f.e. SIT or 1191da177e4SLinus Torvalds * ip6ip6 tunnel) signals dst_link_failure() for an 1201da177e4SLinus Torvalds * outgoing ICMP6 packet. 1211da177e4SLinus Torvalds */ 1221da177e4SLinus Torvalds local_bh_enable(); 123fdc0bde9SDenis V. Lunev return NULL; 1241da177e4SLinus Torvalds } 125fdc0bde9SDenis V. Lunev return sk; 1261da177e4SLinus Torvalds } 1271da177e4SLinus Torvalds 128405666dbSDenis V. Lunev static __inline__ void icmpv6_xmit_unlock(struct sock *sk) 1291da177e4SLinus Torvalds { 130405666dbSDenis V. Lunev spin_unlock_bh(&sk->sk_lock.slock); 1311da177e4SLinus Torvalds } 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvalds /* 1341da177e4SLinus Torvalds * Figure out, may we reply to this packet with icmp error. 1351da177e4SLinus Torvalds * 1361da177e4SLinus Torvalds * We do not reply, if: 1371da177e4SLinus Torvalds * - it was icmp error message. 1381da177e4SLinus Torvalds * - it is truncated, so that it is known, that protocol is ICMPV6 1391da177e4SLinus Torvalds * (i.e. in the middle of some exthdr) 1401da177e4SLinus Torvalds * 1411da177e4SLinus Torvalds * --ANK (980726) 1421da177e4SLinus Torvalds */ 1431da177e4SLinus Torvalds 144a50feda5SEric Dumazet static bool is_ineligible(const struct sk_buff *skb) 1451da177e4SLinus Torvalds { 1460660e03fSArnaldo Carvalho de Melo int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; 1471da177e4SLinus Torvalds int len = skb->len - ptr; 1480660e03fSArnaldo Carvalho de Melo __u8 nexthdr = ipv6_hdr(skb)->nexthdr; 14975f2811cSJesse Gross __be16 frag_off; 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds if (len < 0) 152a50feda5SEric Dumazet return true; 1531da177e4SLinus Torvalds 15475f2811cSJesse Gross ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off); 1551da177e4SLinus Torvalds if (ptr < 0) 156a50feda5SEric Dumazet return false; 1571da177e4SLinus Torvalds if (nexthdr == IPPROTO_ICMPV6) { 1581da177e4SLinus Torvalds u8 _type, *tp; 1591da177e4SLinus Torvalds tp = skb_header_pointer(skb, 1601da177e4SLinus Torvalds ptr+offsetof(struct icmp6hdr, icmp6_type), 1611da177e4SLinus Torvalds sizeof(_type), &_type); 1621da177e4SLinus Torvalds if (tp == NULL || 1631da177e4SLinus Torvalds !(*tp & ICMPV6_INFOMSG_MASK)) 164a50feda5SEric Dumazet return true; 1651da177e4SLinus Torvalds } 166a50feda5SEric Dumazet return false; 1671da177e4SLinus Torvalds } 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvalds /* 1701da177e4SLinus Torvalds * Check the ICMP output rate limit 1711da177e4SLinus Torvalds */ 17292d86829SDavid S. Miller static inline bool icmpv6_xrlim_allow(struct sock *sk, u8 type, 1734c9483b2SDavid S. Miller struct flowi6 *fl6) 1741da177e4SLinus Torvalds { 1751da177e4SLinus Torvalds struct dst_entry *dst; 1763b1e0a65SYOSHIFUJI Hideaki struct net *net = sock_net(sk); 17792d86829SDavid S. Miller bool res = false; 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds /* Informational messages are not limited. */ 1801da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 18192d86829SDavid S. Miller return true; 1821da177e4SLinus Torvalds 1831da177e4SLinus Torvalds /* Do not limit pmtu discovery, it would break it. */ 1841da177e4SLinus Torvalds if (type == ICMPV6_PKT_TOOBIG) 18592d86829SDavid S. Miller return true; 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds /* 1881da177e4SLinus Torvalds * Look up the output route. 1891da177e4SLinus Torvalds * XXX: perhaps the expire for routing entries cloned by 1901da177e4SLinus Torvalds * this lookup should be more aggressive (not longer than timeout). 1911da177e4SLinus Torvalds */ 1924c9483b2SDavid S. Miller dst = ip6_route_output(net, sk, fl6); 1931da177e4SLinus Torvalds if (dst->error) { 1943bd653c8SDenis V. Lunev IP6_INC_STATS(net, ip6_dst_idev(dst), 195a11d206dSYOSHIFUJI Hideaki IPSTATS_MIB_OUTNOROUTES); 1961da177e4SLinus Torvalds } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { 19792d86829SDavid S. Miller res = true; 1981da177e4SLinus Torvalds } else { 1991da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 2009a43b709SBenjamin Thery int tmo = net->ipv6.sysctl.icmpv6_time; 201fbfe95a4SDavid S. Miller struct inet_peer *peer; 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds /* Give more bandwidth to wider prefixes. */ 2041da177e4SLinus Torvalds if (rt->rt6i_dst.plen < 128) 2051da177e4SLinus Torvalds tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 2061da177e4SLinus Torvalds 2071d861aa4SDavid S. Miller peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1); 208fbfe95a4SDavid S. Miller res = inet_peer_xrlim_allow(peer, tmo); 2091d861aa4SDavid S. Miller if (peer) 2101d861aa4SDavid S. Miller inet_putpeer(peer); 2111da177e4SLinus Torvalds } 2121da177e4SLinus Torvalds dst_release(dst); 2131da177e4SLinus Torvalds return res; 2141da177e4SLinus Torvalds } 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds /* 2171da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2181da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2191da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2201da177e4SLinus Torvalds * highest-order two bits set to 10 2211da177e4SLinus Torvalds */ 2221da177e4SLinus Torvalds 223a50feda5SEric Dumazet static bool opt_unrec(struct sk_buff *skb, __u32 offset) 2241da177e4SLinus Torvalds { 2251da177e4SLinus Torvalds u8 _optval, *op; 2261da177e4SLinus Torvalds 227bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2281da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 2291da177e4SLinus Torvalds if (op == NULL) 230a50feda5SEric Dumazet return true; 2311da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2321da177e4SLinus Torvalds } 2331da177e4SLinus Torvalds 2346d0bfe22SLorenzo Colitti int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 2356d0bfe22SLorenzo Colitti struct icmp6hdr *thdr, int len) 2361da177e4SLinus Torvalds { 2371da177e4SLinus Torvalds struct sk_buff *skb; 2381da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2391da177e4SLinus Torvalds int err = 0; 2401da177e4SLinus Torvalds 2411da177e4SLinus Torvalds if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 2421da177e4SLinus Torvalds goto out; 2431da177e4SLinus Torvalds 244cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2451da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2461da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2471da177e4SLinus Torvalds 2481da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 24907f0757aSJoe Perches skb->csum = csum_partial(icmp6h, 2501da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2514c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2524c9483b2SDavid S. Miller &fl6->daddr, 2534c9483b2SDavid S. Miller len, fl6->flowi6_proto, 2541da177e4SLinus Torvalds skb->csum); 2551da177e4SLinus Torvalds } else { 256868c86bcSAl Viro __wsum tmp_csum = 0; 2571da177e4SLinus Torvalds 2581da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2591da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2601da177e4SLinus Torvalds } 2611da177e4SLinus Torvalds 26207f0757aSJoe Perches tmp_csum = csum_partial(icmp6h, 2631da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 2644c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2654c9483b2SDavid S. Miller &fl6->daddr, 2664c9483b2SDavid S. Miller len, fl6->flowi6_proto, 267868c86bcSAl Viro tmp_csum); 2681da177e4SLinus Torvalds } 2691da177e4SLinus Torvalds ip6_push_pending_frames(sk); 2701da177e4SLinus Torvalds out: 2711da177e4SLinus Torvalds return err; 2721da177e4SLinus Torvalds } 2731da177e4SLinus Torvalds 2741da177e4SLinus Torvalds struct icmpv6_msg { 2751da177e4SLinus Torvalds struct sk_buff *skb; 2761da177e4SLinus Torvalds int offset; 277763ecff1SYasuyuki Kozakai uint8_t type; 2781da177e4SLinus Torvalds }; 2791da177e4SLinus Torvalds 2801da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 2811da177e4SLinus Torvalds { 2821da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 2831da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 2845f92a738SAl Viro __wsum csum = 0; 2851da177e4SLinus Torvalds 2861da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 2871da177e4SLinus Torvalds to, len, csum); 2881da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 289763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 290763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 2911da177e4SLinus Torvalds return 0; 2921da177e4SLinus Torvalds } 2931da177e4SLinus Torvalds 29407a93626SAmerigo Wang #if IS_ENABLED(CONFIG_IPV6_MIP6) 29579383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 29679383236SMasahide NAKAMURA { 2970660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 29879383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 29979383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 30079383236SMasahide NAKAMURA struct in6_addr tmp; 30179383236SMasahide NAKAMURA int off; 30279383236SMasahide NAKAMURA 30379383236SMasahide NAKAMURA if (opt->dsthao) { 30479383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 30579383236SMasahide NAKAMURA if (likely(off >= 0)) { 306d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 307d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 3084e3fd7a0SAlexey Dobriyan tmp = iph->saddr; 3094e3fd7a0SAlexey Dobriyan iph->saddr = hao->addr; 3104e3fd7a0SAlexey Dobriyan hao->addr = tmp; 31179383236SMasahide NAKAMURA } 31279383236SMasahide NAKAMURA } 31379383236SMasahide NAKAMURA } 31479383236SMasahide NAKAMURA #else 31579383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 31679383236SMasahide NAKAMURA #endif 31779383236SMasahide NAKAMURA 318e8243534Sstephen hemminger static struct dst_entry *icmpv6_route_lookup(struct net *net, 319e8243534Sstephen hemminger struct sk_buff *skb, 320e8243534Sstephen hemminger struct sock *sk, 321e8243534Sstephen hemminger struct flowi6 *fl6) 322b42835dbSDavid S. Miller { 323b42835dbSDavid S. Miller struct dst_entry *dst, *dst2; 3244c9483b2SDavid S. Miller struct flowi6 fl2; 325b42835dbSDavid S. Miller int err; 326b42835dbSDavid S. Miller 3274c9483b2SDavid S. Miller err = ip6_dst_lookup(sk, &dst, fl6); 328b42835dbSDavid S. Miller if (err) 329b42835dbSDavid S. Miller return ERR_PTR(err); 330b42835dbSDavid S. Miller 331b42835dbSDavid S. Miller /* 332b42835dbSDavid S. Miller * We won't send icmp if the destination is known 333b42835dbSDavid S. Miller * anycast. 334b42835dbSDavid S. Miller */ 335b42835dbSDavid S. Miller if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { 3365f5624cfSPravin B Shelar LIMIT_NETDEBUG(KERN_DEBUG "icmp6_send: acast source\n"); 337b42835dbSDavid S. Miller dst_release(dst); 338b42835dbSDavid S. Miller return ERR_PTR(-EINVAL); 339b42835dbSDavid S. Miller } 340b42835dbSDavid S. Miller 341b42835dbSDavid S. Miller /* No need to clone since we're just using its address. */ 342b42835dbSDavid S. Miller dst2 = dst; 343b42835dbSDavid S. Miller 3444c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); 345452edd59SDavid S. Miller if (!IS_ERR(dst)) { 346b42835dbSDavid S. Miller if (dst != dst2) 347b42835dbSDavid S. Miller return dst; 348452edd59SDavid S. Miller } else { 349452edd59SDavid S. Miller if (PTR_ERR(dst) == -EPERM) 350b42835dbSDavid S. Miller dst = NULL; 351452edd59SDavid S. Miller else 352452edd59SDavid S. Miller return dst; 353b42835dbSDavid S. Miller } 354b42835dbSDavid S. Miller 3554c9483b2SDavid S. Miller err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); 356b42835dbSDavid S. Miller if (err) 357b42835dbSDavid S. Miller goto relookup_failed; 358b42835dbSDavid S. Miller 359b42835dbSDavid S. Miller err = ip6_dst_lookup(sk, &dst2, &fl2); 360b42835dbSDavid S. Miller if (err) 361b42835dbSDavid S. Miller goto relookup_failed; 362b42835dbSDavid S. Miller 3634c9483b2SDavid S. Miller dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); 364452edd59SDavid S. Miller if (!IS_ERR(dst2)) { 365b42835dbSDavid S. Miller dst_release(dst); 366b42835dbSDavid S. Miller dst = dst2; 367452edd59SDavid S. Miller } else { 368452edd59SDavid S. Miller err = PTR_ERR(dst2); 369452edd59SDavid S. Miller if (err == -EPERM) { 370b42835dbSDavid S. Miller dst_release(dst); 371452edd59SDavid S. Miller return dst2; 372452edd59SDavid S. Miller } else 373b42835dbSDavid S. Miller goto relookup_failed; 374b42835dbSDavid S. Miller } 375b42835dbSDavid S. Miller 376b42835dbSDavid S. Miller relookup_failed: 377b42835dbSDavid S. Miller if (dst) 378b42835dbSDavid S. Miller return dst; 379b42835dbSDavid S. Miller return ERR_PTR(err); 380b42835dbSDavid S. Miller } 381b42835dbSDavid S. Miller 3821da177e4SLinus Torvalds /* 3831da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 3841da177e4SLinus Torvalds */ 3855f5624cfSPravin B Shelar static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info) 3861da177e4SLinus Torvalds { 387c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 3881da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 3890660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 39084427d53SYOSHIFUJI Hideaki struct sock *sk; 39184427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 392b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 3931da177e4SLinus Torvalds struct dst_entry *dst; 3941da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 3954c9483b2SDavid S. Miller struct flowi6 fl6; 3961da177e4SLinus Torvalds struct icmpv6_msg msg; 3971da177e4SLinus Torvalds int iif = 0; 3981da177e4SLinus Torvalds int addr_type = 0; 3991da177e4SLinus Torvalds int len; 400e651f03aSGerrit Renker int hlimit; 4011da177e4SLinus Torvalds int err = 0; 4021da177e4SLinus Torvalds 40327a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 40429a3cad5SSimon Horman (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb)) 4051da177e4SLinus Torvalds return; 4061da177e4SLinus Torvalds 4071da177e4SLinus Torvalds /* 4081da177e4SLinus Torvalds * Make sure we respect the rules 4091da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 4105f5624cfSPravin B Shelar * Rule (e.1) is enforced by not using icmp6_send 4111da177e4SLinus Torvalds * in any code that processes icmp errors. 4121da177e4SLinus Torvalds */ 4131da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 4141da177e4SLinus Torvalds 4159a43b709SBenjamin Thery if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0)) 4161da177e4SLinus Torvalds saddr = &hdr->daddr; 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds /* 4191da177e4SLinus Torvalds * Dest addr check 4201da177e4SLinus Torvalds */ 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) { 4231da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 4241da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 4251da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 4261da177e4SLinus Torvalds (opt_unrec(skb, info)))) 4271da177e4SLinus Torvalds return; 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds saddr = NULL; 4301da177e4SLinus Torvalds } 4311da177e4SLinus Torvalds 4321da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 4331da177e4SLinus Torvalds 4341da177e4SLinus Torvalds /* 4351da177e4SLinus Torvalds * Source addr check 4361da177e4SLinus Torvalds */ 4371da177e4SLinus Torvalds 438842df073SHannes Frederic Sowa if (__ipv6_addr_needs_scope_id(addr_type)) 4391da177e4SLinus Torvalds iif = skb->dev->ifindex; 4401da177e4SLinus Torvalds 4411da177e4SLinus Torvalds /* 4428de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 4438de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 4448de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 4458de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 4461da177e4SLinus Torvalds */ 4471da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 4485f5624cfSPravin B Shelar LIMIT_NETDEBUG(KERN_DEBUG "icmp6_send: addr_any/mcast source\n"); 4491da177e4SLinus Torvalds return; 4501da177e4SLinus Torvalds } 4511da177e4SLinus Torvalds 4521da177e4SLinus Torvalds /* 4531da177e4SLinus Torvalds * Never answer to a ICMP packet. 4541da177e4SLinus Torvalds */ 4551da177e4SLinus Torvalds if (is_ineligible(skb)) { 4565f5624cfSPravin B Shelar LIMIT_NETDEBUG(KERN_DEBUG "icmp6_send: no reply to icmp error\n"); 4571da177e4SLinus Torvalds return; 4581da177e4SLinus Torvalds } 4591da177e4SLinus Torvalds 46079383236SMasahide NAKAMURA mip6_addr_swap(skb); 46179383236SMasahide NAKAMURA 4624c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 4634c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 4644e3fd7a0SAlexey Dobriyan fl6.daddr = hdr->saddr; 4651da177e4SLinus Torvalds if (saddr) 4664e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 4674c9483b2SDavid S. Miller fl6.flowi6_oif = iif; 4681958b856SDavid S. Miller fl6.fl6_icmp_type = type; 4691958b856SDavid S. Miller fl6.fl6_icmp_code = code; 4704c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 4711da177e4SLinus Torvalds 472fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 473fdc0bde9SDenis V. Lunev if (sk == NULL) 474405666dbSDenis V. Lunev return; 475fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 476405666dbSDenis V. Lunev 4774c9483b2SDavid S. Miller if (!icmpv6_xrlim_allow(sk, type, &fl6)) 4781da177e4SLinus Torvalds goto out; 4791da177e4SLinus Torvalds 4801da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 4811da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 4821da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 4831da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 4841da177e4SLinus Torvalds 4854c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 4864c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 487c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 488c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 4891da177e4SLinus Torvalds 4904c9483b2SDavid S. Miller dst = icmpv6_route_lookup(net, skb, sk, &fl6); 491b42835dbSDavid S. Miller if (IS_ERR(dst)) 4921da177e4SLinus Torvalds goto out; 4938de3351eSYOSHIFUJI Hideaki 4944c9483b2SDavid S. Miller if (ipv6_addr_is_multicast(&fl6.daddr)) 4951da177e4SLinus Torvalds hlimit = np->mcast_hops; 4961da177e4SLinus Torvalds else 4971da177e4SLinus Torvalds hlimit = np->hop_limit; 4981da177e4SLinus Torvalds if (hlimit < 0) 4996b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 5001da177e4SLinus Torvalds 5011da177e4SLinus Torvalds msg.skb = skb; 502bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 503763ecff1SYasuyuki Kozakai msg.type = type; 5041da177e4SLinus Torvalds 5051da177e4SLinus Torvalds len = skb->len - msg.offset; 5061da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); 5071da177e4SLinus Torvalds if (len < 0) { 50864ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n"); 5091da177e4SLinus Torvalds goto out_dst_release; 5101da177e4SLinus Torvalds } 5111da177e4SLinus Torvalds 512cfdf7647SEric Dumazet rcu_read_lock(); 513cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 5141da177e4SLinus Torvalds 5151da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, 5161da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 517e651f03aSGerrit Renker sizeof(struct icmp6hdr), hlimit, 5184c9483b2SDavid S. Miller np->tclass, NULL, &fl6, (struct rt6_info *)dst, 51913b52cd4SBrian Haley MSG_DONTWAIT, np->dontfrag); 5201da177e4SLinus Torvalds if (err) { 52100d9d6a1SEric Dumazet ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS); 5221da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 523cfdf7647SEric Dumazet } else { 524cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 525cfdf7647SEric Dumazet len + sizeof(struct icmp6hdr)); 5261da177e4SLinus Torvalds } 527cfdf7647SEric Dumazet rcu_read_unlock(); 5281da177e4SLinus Torvalds out_dst_release: 5291da177e4SLinus Torvalds dst_release(dst); 5301da177e4SLinus Torvalds out: 531405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5321da177e4SLinus Torvalds } 5335f5624cfSPravin B Shelar 5345f5624cfSPravin B Shelar /* Slightly more convenient version of icmp6_send. 5355f5624cfSPravin B Shelar */ 5365f5624cfSPravin B Shelar void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) 5375f5624cfSPravin B Shelar { 5385f5624cfSPravin B Shelar icmp6_send(skb, ICMPV6_PARAMPROB, code, pos); 5395f5624cfSPravin B Shelar kfree_skb(skb); 5405f5624cfSPravin B Shelar } 5417159039aSYOSHIFUJI Hideaki 5421da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 5431da177e4SLinus Torvalds { 544c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 54584427d53SYOSHIFUJI Hideaki struct sock *sk; 5461da177e4SLinus Torvalds struct inet6_dev *idev; 54784427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 548b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 549cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 5501da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 5514c9483b2SDavid S. Miller struct flowi6 fl6; 5521da177e4SLinus Torvalds struct icmpv6_msg msg; 5531da177e4SLinus Torvalds struct dst_entry *dst; 5541da177e4SLinus Torvalds int err = 0; 5551da177e4SLinus Torvalds int hlimit; 5561da177e4SLinus Torvalds 5570660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 5581da177e4SLinus Torvalds 5591da177e4SLinus Torvalds if (!ipv6_unicast_destination(skb)) 5601da177e4SLinus Torvalds saddr = NULL; 5611da177e4SLinus Torvalds 5621da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 5631da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 5641da177e4SLinus Torvalds 5654c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 5664c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 5674e3fd7a0SAlexey Dobriyan fl6.daddr = ipv6_hdr(skb)->saddr; 5681da177e4SLinus Torvalds if (saddr) 5694e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 5704c9483b2SDavid S. Miller fl6.flowi6_oif = skb->dev->ifindex; 5711958b856SDavid S. Miller fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; 5724c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 5731da177e4SLinus Torvalds 574fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 575fdc0bde9SDenis V. Lunev if (sk == NULL) 576405666dbSDenis V. Lunev return; 577fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 578405666dbSDenis V. Lunev 5794c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 5804c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 581c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 582c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 5831da177e4SLinus Torvalds 5844c9483b2SDavid S. Miller err = ip6_dst_lookup(sk, &dst, &fl6); 5851da177e4SLinus Torvalds if (err) 5861da177e4SLinus Torvalds goto out; 5874c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); 588452edd59SDavid S. Miller if (IS_ERR(dst)) 589e104411bSPatrick McHardy goto out; 5901da177e4SLinus Torvalds 5914c9483b2SDavid S. Miller if (ipv6_addr_is_multicast(&fl6.daddr)) 5921da177e4SLinus Torvalds hlimit = np->mcast_hops; 5931da177e4SLinus Torvalds else 5941da177e4SLinus Torvalds hlimit = np->hop_limit; 5951da177e4SLinus Torvalds if (hlimit < 0) 5966b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 5971da177e4SLinus Torvalds 598cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 5991da177e4SLinus Torvalds 6001da177e4SLinus Torvalds msg.skb = skb; 6011da177e4SLinus Torvalds msg.offset = 0; 602763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 6031da177e4SLinus Torvalds 6041da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 6054c9483b2SDavid S. Miller sizeof(struct icmp6hdr), hlimit, np->tclass, NULL, &fl6, 60613b52cd4SBrian Haley (struct rt6_info *)dst, MSG_DONTWAIT, 60713b52cd4SBrian Haley np->dontfrag); 6081da177e4SLinus Torvalds 6091da177e4SLinus Torvalds if (err) { 61000d9d6a1SEric Dumazet ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS); 6111da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 612cfdf7647SEric Dumazet } else { 613cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 614cfdf7647SEric Dumazet skb->len + sizeof(struct icmp6hdr)); 6151da177e4SLinus Torvalds } 6161da177e4SLinus Torvalds dst_release(dst); 6171da177e4SLinus Torvalds out: 618405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 6191da177e4SLinus Torvalds } 6201da177e4SLinus Torvalds 621b94f1c09SDavid S. Miller void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 6221da177e4SLinus Torvalds { 62341135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 6241da177e4SLinus Torvalds int inner_offset; 62575f2811cSJesse Gross __be16 frag_off; 626f9242b6bSDavid S. Miller u8 nexthdr; 6271da177e4SLinus Torvalds 6281da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 6291da177e4SLinus Torvalds return; 6301da177e4SLinus Torvalds 6311da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 6321da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 6331da177e4SLinus Torvalds /* now skip over extension headers */ 63475f2811cSJesse Gross inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 63575f2811cSJesse Gross &nexthdr, &frag_off); 6361da177e4SLinus Torvalds if (inner_offset<0) 6371da177e4SLinus Torvalds return; 6381da177e4SLinus Torvalds } else { 6391da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 6401da177e4SLinus Torvalds } 6411da177e4SLinus Torvalds 6421da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 6431da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 6441da177e4SLinus Torvalds return; 6451da177e4SLinus Torvalds 6461da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 6471da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 6481da177e4SLinus Torvalds pmtu discovery. 6491da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 6501da177e4SLinus Torvalds --ANK (980726) 6511da177e4SLinus Torvalds */ 6521da177e4SLinus Torvalds 6531da177e4SLinus Torvalds rcu_read_lock(); 654f9242b6bSDavid S. Miller ipprot = rcu_dereference(inet6_protos[nexthdr]); 6551da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 6561da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 6571da177e4SLinus Torvalds rcu_read_unlock(); 6581da177e4SLinus Torvalds 65969d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 6601da177e4SLinus Torvalds } 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds /* 6631da177e4SLinus Torvalds * Handle icmp messages 6641da177e4SLinus Torvalds */ 6651da177e4SLinus Torvalds 666e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 6671da177e4SLinus Torvalds { 6681da177e4SLinus Torvalds struct net_device *dev = skb->dev; 6691da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 670b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 6711da177e4SLinus Torvalds struct icmp6hdr *hdr; 672d5fdd6baSBrian Haley u8 type; 6731da177e4SLinus Torvalds 674aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 675def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 6768b7817f3SHerbert Xu int nh; 6778b7817f3SHerbert Xu 678def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 679aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 680aebcf82cSHerbert Xu goto drop_no_count; 681aebcf82cSHerbert Xu 68281aded24SDavid S. Miller if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) 6838b7817f3SHerbert Xu goto drop_no_count; 6848b7817f3SHerbert Xu 6858b7817f3SHerbert Xu nh = skb_network_offset(skb); 6868b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 6878b7817f3SHerbert Xu 6888b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 6898b7817f3SHerbert Xu goto drop_no_count; 6908b7817f3SHerbert Xu 6918b7817f3SHerbert Xu skb_set_network_header(skb, nh); 6928b7817f3SHerbert Xu } 6938b7817f3SHerbert Xu 694e41b5368SDenis V. Lunev ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INMSGS); 6951da177e4SLinus Torvalds 6960660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 6970660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 6981da177e4SLinus Torvalds 6991da177e4SLinus Torvalds /* Perform checksum. */ 700fb286bb2SHerbert Xu switch (skb->ip_summed) { 70184fa7933SPatrick McHardy case CHECKSUM_COMPLETE: 702fb286bb2SHerbert Xu if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, 703fb286bb2SHerbert Xu skb->csum)) 704fb286bb2SHerbert Xu break; 705fb286bb2SHerbert Xu /* fall through */ 706fb286bb2SHerbert Xu case CHECKSUM_NONE: 707868c86bcSAl Viro skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len, 708868c86bcSAl Viro IPPROTO_ICMPV6, 0)); 709fb286bb2SHerbert Xu if (__skb_checksum_complete(skb)) { 7106d0bfe22SLorenzo Colitti LIMIT_NETDEBUG(KERN_DEBUG 7116d0bfe22SLorenzo Colitti "ICMPv6 checksum failed [%pI6c > %pI6c]\n", 7120c6ce78aSHarvey Harrison saddr, daddr); 7136a5dc9e5SEric Dumazet goto csum_error; 7141da177e4SLinus Torvalds } 7151da177e4SLinus Torvalds } 7161da177e4SLinus Torvalds 7178cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 7188cf22943SHerbert Xu goto discard_it; 7191da177e4SLinus Torvalds 720cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds type = hdr->icmp6_type; 7231da177e4SLinus Torvalds 72455d43808SDenis V. Lunev ICMP6MSGIN_INC_STATS_BH(dev_net(dev), idev, type); 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds switch (type) { 7271da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 7281da177e4SLinus Torvalds icmpv6_echo_reply(skb); 7291da177e4SLinus Torvalds break; 7301da177e4SLinus Torvalds 7311da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 7326d0bfe22SLorenzo Colitti ping_rcv(skb); 7331da177e4SLinus Torvalds break; 7341da177e4SLinus Torvalds 7351da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 7361da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 7371da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 7381da177e4SLinus Torvalds destination cache will allow to solve this problem 7391da177e4SLinus Torvalds --ANK (980726) 7401da177e4SLinus Torvalds */ 7411da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 7421da177e4SLinus Torvalds goto discard_it; 743cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 7441da177e4SLinus Torvalds 7451da177e4SLinus Torvalds /* 7461da177e4SLinus Torvalds * Drop through to notify 7471da177e4SLinus Torvalds */ 7481da177e4SLinus Torvalds 7491da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 7501da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 7511da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 7521da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7531da177e4SLinus Torvalds break; 7541da177e4SLinus Torvalds 7551da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 7561da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 7571da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 7581da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 7591da177e4SLinus Torvalds case NDISC_REDIRECT: 7601da177e4SLinus Torvalds ndisc_rcv(skb); 7611da177e4SLinus Torvalds break; 7621da177e4SLinus Torvalds 7631da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 7641da177e4SLinus Torvalds igmp6_event_query(skb); 7651da177e4SLinus Torvalds break; 7661da177e4SLinus Torvalds 7671da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 7681da177e4SLinus Torvalds igmp6_event_report(skb); 7691da177e4SLinus Torvalds break; 7701da177e4SLinus Torvalds 7711da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 7721da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 7731da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 7741da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 7751da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 7761da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 7771da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 7781da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 7791da177e4SLinus Torvalds break; 7801da177e4SLinus Torvalds 7811da177e4SLinus Torvalds default: 78264ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n"); 7831da177e4SLinus Torvalds 7841da177e4SLinus Torvalds /* informational */ 7851da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 7861da177e4SLinus Torvalds break; 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds /* 7891da177e4SLinus Torvalds * error of unknown type. 7901da177e4SLinus Torvalds * must pass to upper level 7911da177e4SLinus Torvalds */ 7921da177e4SLinus Torvalds 7931da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7943ff50b79SStephen Hemminger } 7953ff50b79SStephen Hemminger 7961da177e4SLinus Torvalds kfree_skb(skb); 7971da177e4SLinus Torvalds return 0; 7981da177e4SLinus Torvalds 7996a5dc9e5SEric Dumazet csum_error: 8006a5dc9e5SEric Dumazet ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); 8011da177e4SLinus Torvalds discard_it: 802e41b5368SDenis V. Lunev ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INERRORS); 8038b7817f3SHerbert Xu drop_no_count: 8041da177e4SLinus Torvalds kfree_skb(skb); 8051da177e4SLinus Torvalds return 0; 8061da177e4SLinus Torvalds } 8071da177e4SLinus Torvalds 8084c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, 80995e41e93SYOSHIFUJI Hideaki u8 type, 81095e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 81195e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 81295e41e93SYOSHIFUJI Hideaki int oif) 81395e41e93SYOSHIFUJI Hideaki { 8144c9483b2SDavid S. Miller memset(fl6, 0, sizeof(*fl6)); 8154e3fd7a0SAlexey Dobriyan fl6->saddr = *saddr; 8164e3fd7a0SAlexey Dobriyan fl6->daddr = *daddr; 8174c9483b2SDavid S. Miller fl6->flowi6_proto = IPPROTO_ICMPV6; 8181958b856SDavid S. Miller fl6->fl6_icmp_type = type; 8191958b856SDavid S. Miller fl6->fl6_icmp_code = 0; 8204c9483b2SDavid S. Miller fl6->flowi6_oif = oif; 8214c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); 82295e41e93SYOSHIFUJI Hideaki } 82395e41e93SYOSHIFUJI Hideaki 824640c41c7SIngo Molnar /* 825b7e729c4SDenis V. Lunev * Special lock-class for __icmpv6_sk: 826640c41c7SIngo Molnar */ 827640c41c7SIngo Molnar static struct lock_class_key icmpv6_socket_sk_dst_lock_key; 828640c41c7SIngo Molnar 82998c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 8301da177e4SLinus Torvalds { 8311da177e4SLinus Torvalds struct sock *sk; 8321da177e4SLinus Torvalds int err, i, j; 8331da177e4SLinus Torvalds 83498c6d1b2SDenis V. Lunev net->ipv6.icmp_sk = 83598c6d1b2SDenis V. Lunev kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); 83698c6d1b2SDenis V. Lunev if (net->ipv6.icmp_sk == NULL) 83779c91159SDenis V. Lunev return -ENOMEM; 83879c91159SDenis V. Lunev 8396f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8401ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 8411ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 8421da177e4SLinus Torvalds if (err < 0) { 843f3213831SJoe Perches pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", 8441da177e4SLinus Torvalds err); 8451da177e4SLinus Torvalds goto fail; 8461da177e4SLinus Torvalds } 8471da177e4SLinus Torvalds 8481ed8516fSDenis V. Lunev net->ipv6.icmp_sk[i] = sk; 8495c8cafd6SDenis V. Lunev 850640c41c7SIngo Molnar /* 851640c41c7SIngo Molnar * Split off their lock-class, because sk->sk_dst_lock 852640c41c7SIngo Molnar * gets used from softirqs, which is safe for 853b7e729c4SDenis V. Lunev * __icmpv6_sk (because those never get directly used 854640c41c7SIngo Molnar * via userspace syscalls), but unsafe for normal sockets. 855640c41c7SIngo Molnar */ 856640c41c7SIngo Molnar lockdep_set_class(&sk->sk_dst_lock, 857640c41c7SIngo Molnar &icmpv6_socket_sk_dst_lock_key); 8581da177e4SLinus Torvalds 8591da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 8601da177e4SLinus Torvalds * sk_buff struct overhead. 8611da177e4SLinus Torvalds */ 86287fb4b7bSEric Dumazet sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); 8631da177e4SLinus Torvalds } 8641da177e4SLinus Torvalds return 0; 8651da177e4SLinus Torvalds 8661da177e4SLinus Torvalds fail: 8675c8cafd6SDenis V. Lunev for (j = 0; j < i; j++) 8681ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); 86998c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 8701da177e4SLinus Torvalds return err; 8711da177e4SLinus Torvalds } 8721da177e4SLinus Torvalds 87398c6d1b2SDenis V. Lunev static void __net_exit icmpv6_sk_exit(struct net *net) 8741da177e4SLinus Torvalds { 8751da177e4SLinus Torvalds int i; 8761da177e4SLinus Torvalds 8776f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8781ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); 8791da177e4SLinus Torvalds } 88098c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 88198c6d1b2SDenis V. Lunev } 88298c6d1b2SDenis V. Lunev 8838ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 88498c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 88598c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 88698c6d1b2SDenis V. Lunev }; 88798c6d1b2SDenis V. Lunev 88898c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 88998c6d1b2SDenis V. Lunev { 89098c6d1b2SDenis V. Lunev int err; 89198c6d1b2SDenis V. Lunev 89298c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 89398c6d1b2SDenis V. Lunev if (err < 0) 89498c6d1b2SDenis V. Lunev return err; 89598c6d1b2SDenis V. Lunev 89698c6d1b2SDenis V. Lunev err = -EAGAIN; 89798c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 89898c6d1b2SDenis V. Lunev goto fail; 8995f5624cfSPravin B Shelar 9005f5624cfSPravin B Shelar err = inet6_register_icmp_sender(icmp6_send); 9015f5624cfSPravin B Shelar if (err) 9025f5624cfSPravin B Shelar goto sender_reg_err; 90398c6d1b2SDenis V. Lunev return 0; 90498c6d1b2SDenis V. Lunev 9055f5624cfSPravin B Shelar sender_reg_err: 9065f5624cfSPravin B Shelar inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 90798c6d1b2SDenis V. Lunev fail: 908f3213831SJoe Perches pr_err("Failed to register ICMP6 protocol\n"); 90998c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 91098c6d1b2SDenis V. Lunev return err; 91198c6d1b2SDenis V. Lunev } 91298c6d1b2SDenis V. Lunev 9138ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 91498c6d1b2SDenis V. Lunev { 9155f5624cfSPravin B Shelar inet6_unregister_icmp_sender(icmp6_send); 91698c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 9171da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 9181da177e4SLinus Torvalds } 9191da177e4SLinus Torvalds 92098c6d1b2SDenis V. Lunev 9219b5b5cffSArjan van de Ven static const struct icmp6_err { 9221da177e4SLinus Torvalds int err; 9231da177e4SLinus Torvalds int fatal; 9241da177e4SLinus Torvalds } tab_unreach[] = { 9251da177e4SLinus Torvalds { /* NOROUTE */ 9261da177e4SLinus Torvalds .err = ENETUNREACH, 9271da177e4SLinus Torvalds .fatal = 0, 9281da177e4SLinus Torvalds }, 9291da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 9301da177e4SLinus Torvalds .err = EACCES, 9311da177e4SLinus Torvalds .fatal = 1, 9321da177e4SLinus Torvalds }, 9331da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 9341da177e4SLinus Torvalds .err = EHOSTUNREACH, 9351da177e4SLinus Torvalds .fatal = 0, 9361da177e4SLinus Torvalds }, 9371da177e4SLinus Torvalds { /* ADDR_UNREACH */ 9381da177e4SLinus Torvalds .err = EHOSTUNREACH, 9391da177e4SLinus Torvalds .fatal = 0, 9401da177e4SLinus Torvalds }, 9411da177e4SLinus Torvalds { /* PORT_UNREACH */ 9421da177e4SLinus Torvalds .err = ECONNREFUSED, 9431da177e4SLinus Torvalds .fatal = 1, 9441da177e4SLinus Torvalds }, 94561e76b17SJiri Bohac { /* POLICY_FAIL */ 94661e76b17SJiri Bohac .err = EACCES, 94761e76b17SJiri Bohac .fatal = 1, 94861e76b17SJiri Bohac }, 94961e76b17SJiri Bohac { /* REJECT_ROUTE */ 95061e76b17SJiri Bohac .err = EACCES, 95161e76b17SJiri Bohac .fatal = 1, 95261e76b17SJiri Bohac }, 9531da177e4SLinus Torvalds }; 9541da177e4SLinus Torvalds 955d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 9561da177e4SLinus Torvalds { 9571da177e4SLinus Torvalds int fatal = 0; 9581da177e4SLinus Torvalds 9591da177e4SLinus Torvalds *err = EPROTO; 9601da177e4SLinus Torvalds 9611da177e4SLinus Torvalds switch (type) { 9621da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 9631da177e4SLinus Torvalds fatal = 1; 96461e76b17SJiri Bohac if (code < ARRAY_SIZE(tab_unreach)) { 9651da177e4SLinus Torvalds *err = tab_unreach[code].err; 9661da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 9671da177e4SLinus Torvalds } 9681da177e4SLinus Torvalds break; 9691da177e4SLinus Torvalds 9701da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 9711da177e4SLinus Torvalds *err = EMSGSIZE; 9721da177e4SLinus Torvalds break; 9731da177e4SLinus Torvalds 9741da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 9751da177e4SLinus Torvalds *err = EPROTO; 9761da177e4SLinus Torvalds fatal = 1; 9771da177e4SLinus Torvalds break; 9781da177e4SLinus Torvalds 9791da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 9801da177e4SLinus Torvalds *err = EHOSTUNREACH; 9811da177e4SLinus Torvalds break; 9823ff50b79SStephen Hemminger } 9831da177e4SLinus Torvalds 9841da177e4SLinus Torvalds return fatal; 9851da177e4SLinus Torvalds } 9867159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 9877159039aSYOSHIFUJI Hideaki 9881da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 989e8243534Sstephen hemminger static struct ctl_table ipv6_icmp_table_template[] = { 9901da177e4SLinus Torvalds { 9911da177e4SLinus Torvalds .procname = "ratelimit", 99241a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 9931da177e4SLinus Torvalds .maxlen = sizeof(int), 9941da177e4SLinus Torvalds .mode = 0644, 9956d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 9961da177e4SLinus Torvalds }, 997f8572d8fSEric W. Biederman { }, 9981da177e4SLinus Torvalds }; 999760f2d01SDaniel Lezcano 10002c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 1001760f2d01SDaniel Lezcano { 1002760f2d01SDaniel Lezcano struct ctl_table *table; 1003760f2d01SDaniel Lezcano 1004760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 1005760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 1006760f2d01SDaniel Lezcano GFP_KERNEL); 10075ee09105SYOSHIFUJI Hideaki 1008c027aab4SEric W. Biederman if (table) 10095ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 10105ee09105SYOSHIFUJI Hideaki 1011760f2d01SDaniel Lezcano return table; 1012760f2d01SDaniel Lezcano } 10131da177e4SLinus Torvalds #endif 10141da177e4SLinus Torvalds 1015