11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * Internet Control Message Protocol (ICMPv6) 31da177e4SLinus Torvalds * Linux INET6 implementation 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Authors: 61da177e4SLinus Torvalds * Pedro Roque <roque@di.fc.ul.pt> 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * Based on net/ipv4/icmp.c 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * RFC 1885 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 131da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 141da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 151da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 161da177e4SLinus Torvalds */ 171da177e4SLinus Torvalds 181da177e4SLinus Torvalds /* 191da177e4SLinus Torvalds * Changes: 201da177e4SLinus Torvalds * 211da177e4SLinus Torvalds * Andi Kleen : exception handling 221da177e4SLinus Torvalds * Andi Kleen add rate limits. never reply to a icmp. 231da177e4SLinus Torvalds * add more length checks and other fixes. 241da177e4SLinus Torvalds * yoshfuji : ensure to sent parameter problem for 251da177e4SLinus Torvalds * fragments. 261da177e4SLinus Torvalds * YOSHIFUJI Hideaki @USAGI: added sysctl for icmp rate limit. 271da177e4SLinus Torvalds * Randy Dunlap and 281da177e4SLinus Torvalds * YOSHIFUJI Hideaki @USAGI: Per-interface statistics support 291da177e4SLinus Torvalds * Kazunori MIYAZAWA @USAGI: change output process to use ip6_append_data 301da177e4SLinus Torvalds */ 311da177e4SLinus Torvalds 32f3213831SJoe Perches #define pr_fmt(fmt) "IPv6: " fmt 33f3213831SJoe Perches 341da177e4SLinus Torvalds #include <linux/module.h> 351da177e4SLinus Torvalds #include <linux/errno.h> 361da177e4SLinus Torvalds #include <linux/types.h> 371da177e4SLinus Torvalds #include <linux/socket.h> 381da177e4SLinus Torvalds #include <linux/in.h> 391da177e4SLinus Torvalds #include <linux/kernel.h> 401da177e4SLinus Torvalds #include <linux/sockios.h> 411da177e4SLinus Torvalds #include <linux/net.h> 421da177e4SLinus Torvalds #include <linux/skbuff.h> 431da177e4SLinus Torvalds #include <linux/init.h> 44763ecff1SYasuyuki Kozakai #include <linux/netfilter.h> 455a0e3ad6STejun Heo #include <linux/slab.h> 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 481da177e4SLinus Torvalds #include <linux/sysctl.h> 491da177e4SLinus Torvalds #endif 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds #include <linux/inet.h> 521da177e4SLinus Torvalds #include <linux/netdevice.h> 531da177e4SLinus Torvalds #include <linux/icmpv6.h> 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds #include <net/ip.h> 561da177e4SLinus Torvalds #include <net/sock.h> 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds #include <net/ipv6.h> 591da177e4SLinus Torvalds #include <net/ip6_checksum.h> 601da177e4SLinus Torvalds #include <net/protocol.h> 611da177e4SLinus Torvalds #include <net/raw.h> 621da177e4SLinus Torvalds #include <net/rawv6.h> 631da177e4SLinus Torvalds #include <net/transp_v6.h> 641da177e4SLinus Torvalds #include <net/ip6_route.h> 651da177e4SLinus Torvalds #include <net/addrconf.h> 661da177e4SLinus Torvalds #include <net/icmp.h> 678b7817f3SHerbert Xu #include <net/xfrm.h> 681ed8516fSDenis V. Lunev #include <net/inet_common.h> 691da177e4SLinus Torvalds 701da177e4SLinus Torvalds #include <asm/uaccess.h> 711da177e4SLinus Torvalds 721da177e4SLinus Torvalds /* 731da177e4SLinus Torvalds * The ICMP socket(s). This is the most convenient way to flow control 741da177e4SLinus Torvalds * our ICMP output as well as maintain a clean interface throughout 751da177e4SLinus Torvalds * all layers. All Socketless IP sends will soon be gone. 761da177e4SLinus Torvalds * 771da177e4SLinus Torvalds * On SMP we have one ICMP socket per-cpu. 781da177e4SLinus Torvalds */ 7998c6d1b2SDenis V. Lunev static inline struct sock *icmpv6_sk(struct net *net) 8098c6d1b2SDenis V. Lunev { 8198c6d1b2SDenis V. Lunev return net->ipv6.icmp_sk[smp_processor_id()]; 8298c6d1b2SDenis V. Lunev } 831da177e4SLinus Torvalds 846f809da2SSteffen Klassert static void icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 856f809da2SSteffen Klassert u8 type, u8 code, int offset, __be32 info) 866f809da2SSteffen Klassert { 876f809da2SSteffen Klassert struct net *net = dev_net(skb->dev); 886f809da2SSteffen Klassert 896f809da2SSteffen Klassert if (type == ICMPV6_PKT_TOOBIG) 906f809da2SSteffen Klassert ip6_update_pmtu(skb, net, info, 0, 0); 916f809da2SSteffen Klassert else if (type == NDISC_REDIRECT) 926f809da2SSteffen Klassert ip6_redirect(skb, net, 0, 0); 936f809da2SSteffen Klassert } 946f809da2SSteffen Klassert 95e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb); 961da177e4SLinus Torvalds 9741135cc8SAlexey Dobriyan static const struct inet6_protocol icmpv6_protocol = { 981da177e4SLinus Torvalds .handler = icmpv6_rcv, 996f809da2SSteffen Klassert .err_handler = icmpv6_err, 1008b7817f3SHerbert Xu .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1011da177e4SLinus Torvalds }; 1021da177e4SLinus Torvalds 103fdc0bde9SDenis V. Lunev static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) 1041da177e4SLinus Torvalds { 105fdc0bde9SDenis V. Lunev struct sock *sk; 106fdc0bde9SDenis V. Lunev 1071da177e4SLinus Torvalds local_bh_disable(); 1081da177e4SLinus Torvalds 109fdc0bde9SDenis V. Lunev sk = icmpv6_sk(net); 110405666dbSDenis V. Lunev if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { 1111da177e4SLinus Torvalds /* This can happen if the output path (f.e. SIT or 1121da177e4SLinus Torvalds * ip6ip6 tunnel) signals dst_link_failure() for an 1131da177e4SLinus Torvalds * outgoing ICMP6 packet. 1141da177e4SLinus Torvalds */ 1151da177e4SLinus Torvalds local_bh_enable(); 116fdc0bde9SDenis V. Lunev return NULL; 1171da177e4SLinus Torvalds } 118fdc0bde9SDenis V. Lunev return sk; 1191da177e4SLinus Torvalds } 1201da177e4SLinus Torvalds 121405666dbSDenis V. Lunev static __inline__ void icmpv6_xmit_unlock(struct sock *sk) 1221da177e4SLinus Torvalds { 123405666dbSDenis V. Lunev spin_unlock_bh(&sk->sk_lock.slock); 1241da177e4SLinus Torvalds } 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds /* 1271da177e4SLinus Torvalds * Figure out, may we reply to this packet with icmp error. 1281da177e4SLinus Torvalds * 1291da177e4SLinus Torvalds * We do not reply, if: 1301da177e4SLinus Torvalds * - it was icmp error message. 1311da177e4SLinus Torvalds * - it is truncated, so that it is known, that protocol is ICMPV6 1321da177e4SLinus Torvalds * (i.e. in the middle of some exthdr) 1331da177e4SLinus Torvalds * 1341da177e4SLinus Torvalds * --ANK (980726) 1351da177e4SLinus Torvalds */ 1361da177e4SLinus Torvalds 137a50feda5SEric Dumazet static bool is_ineligible(const struct sk_buff *skb) 1381da177e4SLinus Torvalds { 1390660e03fSArnaldo Carvalho de Melo int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; 1401da177e4SLinus Torvalds int len = skb->len - ptr; 1410660e03fSArnaldo Carvalho de Melo __u8 nexthdr = ipv6_hdr(skb)->nexthdr; 14275f2811cSJesse Gross __be16 frag_off; 1431da177e4SLinus Torvalds 1441da177e4SLinus Torvalds if (len < 0) 145a50feda5SEric Dumazet return true; 1461da177e4SLinus Torvalds 14775f2811cSJesse Gross ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off); 1481da177e4SLinus Torvalds if (ptr < 0) 149a50feda5SEric Dumazet return false; 1501da177e4SLinus Torvalds if (nexthdr == IPPROTO_ICMPV6) { 1511da177e4SLinus Torvalds u8 _type, *tp; 1521da177e4SLinus Torvalds tp = skb_header_pointer(skb, 1531da177e4SLinus Torvalds ptr+offsetof(struct icmp6hdr, icmp6_type), 1541da177e4SLinus Torvalds sizeof(_type), &_type); 1551da177e4SLinus Torvalds if (tp == NULL || 1561da177e4SLinus Torvalds !(*tp & ICMPV6_INFOMSG_MASK)) 157a50feda5SEric Dumazet return true; 1581da177e4SLinus Torvalds } 159a50feda5SEric Dumazet return false; 1601da177e4SLinus Torvalds } 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds /* 1631da177e4SLinus Torvalds * Check the ICMP output rate limit 1641da177e4SLinus Torvalds */ 16592d86829SDavid S. Miller static inline bool icmpv6_xrlim_allow(struct sock *sk, u8 type, 1664c9483b2SDavid S. Miller struct flowi6 *fl6) 1671da177e4SLinus Torvalds { 1681da177e4SLinus Torvalds struct dst_entry *dst; 1693b1e0a65SYOSHIFUJI Hideaki struct net *net = sock_net(sk); 17092d86829SDavid S. Miller bool res = false; 1711da177e4SLinus Torvalds 1721da177e4SLinus Torvalds /* Informational messages are not limited. */ 1731da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 17492d86829SDavid S. Miller return true; 1751da177e4SLinus Torvalds 1761da177e4SLinus Torvalds /* Do not limit pmtu discovery, it would break it. */ 1771da177e4SLinus Torvalds if (type == ICMPV6_PKT_TOOBIG) 17892d86829SDavid S. Miller return true; 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds /* 1811da177e4SLinus Torvalds * Look up the output route. 1821da177e4SLinus Torvalds * XXX: perhaps the expire for routing entries cloned by 1831da177e4SLinus Torvalds * this lookup should be more aggressive (not longer than timeout). 1841da177e4SLinus Torvalds */ 1854c9483b2SDavid S. Miller dst = ip6_route_output(net, sk, fl6); 1861da177e4SLinus Torvalds if (dst->error) { 1873bd653c8SDenis V. Lunev IP6_INC_STATS(net, ip6_dst_idev(dst), 188a11d206dSYOSHIFUJI Hideaki IPSTATS_MIB_OUTNOROUTES); 1891da177e4SLinus Torvalds } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { 19092d86829SDavid S. Miller res = true; 1911da177e4SLinus Torvalds } else { 1921da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 1939a43b709SBenjamin Thery int tmo = net->ipv6.sysctl.icmpv6_time; 194fbfe95a4SDavid S. Miller struct inet_peer *peer; 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds /* Give more bandwidth to wider prefixes. */ 1971da177e4SLinus Torvalds if (rt->rt6i_dst.plen < 128) 1981da177e4SLinus Torvalds tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 1991da177e4SLinus Torvalds 2001d861aa4SDavid S. Miller peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1); 201fbfe95a4SDavid S. Miller res = inet_peer_xrlim_allow(peer, tmo); 2021d861aa4SDavid S. Miller if (peer) 2031d861aa4SDavid S. Miller inet_putpeer(peer); 2041da177e4SLinus Torvalds } 2051da177e4SLinus Torvalds dst_release(dst); 2061da177e4SLinus Torvalds return res; 2071da177e4SLinus Torvalds } 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds /* 2101da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2111da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2121da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2131da177e4SLinus Torvalds * highest-order two bits set to 10 2141da177e4SLinus Torvalds */ 2151da177e4SLinus Torvalds 216a50feda5SEric Dumazet static bool opt_unrec(struct sk_buff *skb, __u32 offset) 2171da177e4SLinus Torvalds { 2181da177e4SLinus Torvalds u8 _optval, *op; 2191da177e4SLinus Torvalds 220bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2211da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 2221da177e4SLinus Torvalds if (op == NULL) 223a50feda5SEric Dumazet return true; 2241da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2251da177e4SLinus Torvalds } 2261da177e4SLinus Torvalds 2274c9483b2SDavid S. Miller static int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, struct icmp6hdr *thdr, int len) 2281da177e4SLinus Torvalds { 2291da177e4SLinus Torvalds struct sk_buff *skb; 2301da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2311da177e4SLinus Torvalds int err = 0; 2321da177e4SLinus Torvalds 2331da177e4SLinus Torvalds if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 2341da177e4SLinus Torvalds goto out; 2351da177e4SLinus Torvalds 236cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2371da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2381da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2391da177e4SLinus Torvalds 2401da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 24107f0757aSJoe Perches skb->csum = csum_partial(icmp6h, 2421da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2434c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2444c9483b2SDavid S. Miller &fl6->daddr, 2454c9483b2SDavid S. Miller len, fl6->flowi6_proto, 2461da177e4SLinus Torvalds skb->csum); 2471da177e4SLinus Torvalds } else { 248868c86bcSAl Viro __wsum tmp_csum = 0; 2491da177e4SLinus Torvalds 2501da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2511da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2521da177e4SLinus Torvalds } 2531da177e4SLinus Torvalds 25407f0757aSJoe Perches tmp_csum = csum_partial(icmp6h, 2551da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 2564c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2574c9483b2SDavid S. Miller &fl6->daddr, 2584c9483b2SDavid S. Miller len, fl6->flowi6_proto, 259868c86bcSAl Viro tmp_csum); 2601da177e4SLinus Torvalds } 2611da177e4SLinus Torvalds ip6_push_pending_frames(sk); 2621da177e4SLinus Torvalds out: 2631da177e4SLinus Torvalds return err; 2641da177e4SLinus Torvalds } 2651da177e4SLinus Torvalds 2661da177e4SLinus Torvalds struct icmpv6_msg { 2671da177e4SLinus Torvalds struct sk_buff *skb; 2681da177e4SLinus Torvalds int offset; 269763ecff1SYasuyuki Kozakai uint8_t type; 2701da177e4SLinus Torvalds }; 2711da177e4SLinus Torvalds 2721da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 2731da177e4SLinus Torvalds { 2741da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 2751da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 2765f92a738SAl Viro __wsum csum = 0; 2771da177e4SLinus Torvalds 2781da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 2791da177e4SLinus Torvalds to, len, csum); 2801da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 281763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 282763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 2831da177e4SLinus Torvalds return 0; 2841da177e4SLinus Torvalds } 2851da177e4SLinus Torvalds 28607a93626SAmerigo Wang #if IS_ENABLED(CONFIG_IPV6_MIP6) 28779383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 28879383236SMasahide NAKAMURA { 2890660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 29079383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 29179383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 29279383236SMasahide NAKAMURA struct in6_addr tmp; 29379383236SMasahide NAKAMURA int off; 29479383236SMasahide NAKAMURA 29579383236SMasahide NAKAMURA if (opt->dsthao) { 29679383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 29779383236SMasahide NAKAMURA if (likely(off >= 0)) { 298d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 299d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 3004e3fd7a0SAlexey Dobriyan tmp = iph->saddr; 3014e3fd7a0SAlexey Dobriyan iph->saddr = hao->addr; 3024e3fd7a0SAlexey Dobriyan hao->addr = tmp; 30379383236SMasahide NAKAMURA } 30479383236SMasahide NAKAMURA } 30579383236SMasahide NAKAMURA } 30679383236SMasahide NAKAMURA #else 30779383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 30879383236SMasahide NAKAMURA #endif 30979383236SMasahide NAKAMURA 310b42835dbSDavid S. Miller static struct dst_entry *icmpv6_route_lookup(struct net *net, struct sk_buff *skb, 3114c9483b2SDavid S. Miller struct sock *sk, struct flowi6 *fl6) 312b42835dbSDavid S. Miller { 313b42835dbSDavid S. Miller struct dst_entry *dst, *dst2; 3144c9483b2SDavid S. Miller struct flowi6 fl2; 315b42835dbSDavid S. Miller int err; 316b42835dbSDavid S. Miller 3174c9483b2SDavid S. Miller err = ip6_dst_lookup(sk, &dst, fl6); 318b42835dbSDavid S. Miller if (err) 319b42835dbSDavid S. Miller return ERR_PTR(err); 320b42835dbSDavid S. Miller 321b42835dbSDavid S. Miller /* 322b42835dbSDavid S. Miller * We won't send icmp if the destination is known 323b42835dbSDavid S. Miller * anycast. 324b42835dbSDavid S. Miller */ 325b42835dbSDavid S. Miller if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { 3265f5624cfSPravin B Shelar LIMIT_NETDEBUG(KERN_DEBUG "icmp6_send: acast source\n"); 327b42835dbSDavid S. Miller dst_release(dst); 328b42835dbSDavid S. Miller return ERR_PTR(-EINVAL); 329b42835dbSDavid S. Miller } 330b42835dbSDavid S. Miller 331b42835dbSDavid S. Miller /* No need to clone since we're just using its address. */ 332b42835dbSDavid S. Miller dst2 = dst; 333b42835dbSDavid S. Miller 3344c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); 335452edd59SDavid S. Miller if (!IS_ERR(dst)) { 336b42835dbSDavid S. Miller if (dst != dst2) 337b42835dbSDavid S. Miller return dst; 338452edd59SDavid S. Miller } else { 339452edd59SDavid S. Miller if (PTR_ERR(dst) == -EPERM) 340b42835dbSDavid S. Miller dst = NULL; 341452edd59SDavid S. Miller else 342452edd59SDavid S. Miller return dst; 343b42835dbSDavid S. Miller } 344b42835dbSDavid S. Miller 3454c9483b2SDavid S. Miller err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); 346b42835dbSDavid S. Miller if (err) 347b42835dbSDavid S. Miller goto relookup_failed; 348b42835dbSDavid S. Miller 349b42835dbSDavid S. Miller err = ip6_dst_lookup(sk, &dst2, &fl2); 350b42835dbSDavid S. Miller if (err) 351b42835dbSDavid S. Miller goto relookup_failed; 352b42835dbSDavid S. Miller 3534c9483b2SDavid S. Miller dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); 354452edd59SDavid S. Miller if (!IS_ERR(dst2)) { 355b42835dbSDavid S. Miller dst_release(dst); 356b42835dbSDavid S. Miller dst = dst2; 357452edd59SDavid S. Miller } else { 358452edd59SDavid S. Miller err = PTR_ERR(dst2); 359452edd59SDavid S. Miller if (err == -EPERM) { 360b42835dbSDavid S. Miller dst_release(dst); 361452edd59SDavid S. Miller return dst2; 362452edd59SDavid S. Miller } else 363b42835dbSDavid S. Miller goto relookup_failed; 364b42835dbSDavid S. Miller } 365b42835dbSDavid S. Miller 366b42835dbSDavid S. Miller relookup_failed: 367b42835dbSDavid S. Miller if (dst) 368b42835dbSDavid S. Miller return dst; 369b42835dbSDavid S. Miller return ERR_PTR(err); 370b42835dbSDavid S. Miller } 371b42835dbSDavid S. Miller 3721da177e4SLinus Torvalds /* 3731da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 3741da177e4SLinus Torvalds */ 3755f5624cfSPravin B Shelar static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info) 3761da177e4SLinus Torvalds { 377c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 3781da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 3790660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 38084427d53SYOSHIFUJI Hideaki struct sock *sk; 38184427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 382b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 3831da177e4SLinus Torvalds struct dst_entry *dst; 3841da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 3854c9483b2SDavid S. Miller struct flowi6 fl6; 3861da177e4SLinus Torvalds struct icmpv6_msg msg; 3871da177e4SLinus Torvalds int iif = 0; 3881da177e4SLinus Torvalds int addr_type = 0; 3891da177e4SLinus Torvalds int len; 390e651f03aSGerrit Renker int hlimit; 3911da177e4SLinus Torvalds int err = 0; 3921da177e4SLinus Torvalds 39327a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 39427a884dcSArnaldo Carvalho de Melo (skb->network_header + sizeof(*hdr)) > skb->tail) 3951da177e4SLinus Torvalds return; 3961da177e4SLinus Torvalds 3971da177e4SLinus Torvalds /* 3981da177e4SLinus Torvalds * Make sure we respect the rules 3991da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 4005f5624cfSPravin B Shelar * Rule (e.1) is enforced by not using icmp6_send 4011da177e4SLinus Torvalds * in any code that processes icmp errors. 4021da177e4SLinus Torvalds */ 4031da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 4041da177e4SLinus Torvalds 4059a43b709SBenjamin Thery if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0)) 4061da177e4SLinus Torvalds saddr = &hdr->daddr; 4071da177e4SLinus Torvalds 4081da177e4SLinus Torvalds /* 4091da177e4SLinus Torvalds * Dest addr check 4101da177e4SLinus Torvalds */ 4111da177e4SLinus Torvalds 4121da177e4SLinus Torvalds if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) { 4131da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 4141da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 4151da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 4161da177e4SLinus Torvalds (opt_unrec(skb, info)))) 4171da177e4SLinus Torvalds return; 4181da177e4SLinus Torvalds 4191da177e4SLinus Torvalds saddr = NULL; 4201da177e4SLinus Torvalds } 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds /* 4251da177e4SLinus Torvalds * Source addr check 4261da177e4SLinus Torvalds */ 4271da177e4SLinus Torvalds 428842df073SHannes Frederic Sowa if (__ipv6_addr_needs_scope_id(addr_type)) 4291da177e4SLinus Torvalds iif = skb->dev->ifindex; 4301da177e4SLinus Torvalds 4311da177e4SLinus Torvalds /* 4328de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 4338de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 4348de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 4358de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 4361da177e4SLinus Torvalds */ 4371da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 4385f5624cfSPravin B Shelar LIMIT_NETDEBUG(KERN_DEBUG "icmp6_send: addr_any/mcast source\n"); 4391da177e4SLinus Torvalds return; 4401da177e4SLinus Torvalds } 4411da177e4SLinus Torvalds 4421da177e4SLinus Torvalds /* 4431da177e4SLinus Torvalds * Never answer to a ICMP packet. 4441da177e4SLinus Torvalds */ 4451da177e4SLinus Torvalds if (is_ineligible(skb)) { 4465f5624cfSPravin B Shelar LIMIT_NETDEBUG(KERN_DEBUG "icmp6_send: no reply to icmp error\n"); 4471da177e4SLinus Torvalds return; 4481da177e4SLinus Torvalds } 4491da177e4SLinus Torvalds 45079383236SMasahide NAKAMURA mip6_addr_swap(skb); 45179383236SMasahide NAKAMURA 4524c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 4534c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 4544e3fd7a0SAlexey Dobriyan fl6.daddr = hdr->saddr; 4551da177e4SLinus Torvalds if (saddr) 4564e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 4574c9483b2SDavid S. Miller fl6.flowi6_oif = iif; 4581958b856SDavid S. Miller fl6.fl6_icmp_type = type; 4591958b856SDavid S. Miller fl6.fl6_icmp_code = code; 4604c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 4611da177e4SLinus Torvalds 462fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 463fdc0bde9SDenis V. Lunev if (sk == NULL) 464405666dbSDenis V. Lunev return; 465fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 466405666dbSDenis V. Lunev 4674c9483b2SDavid S. Miller if (!icmpv6_xrlim_allow(sk, type, &fl6)) 4681da177e4SLinus Torvalds goto out; 4691da177e4SLinus Torvalds 4701da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 4711da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 4721da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 4731da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 4741da177e4SLinus Torvalds 4754c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 4764c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 477c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 478c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 4791da177e4SLinus Torvalds 4804c9483b2SDavid S. Miller dst = icmpv6_route_lookup(net, skb, sk, &fl6); 481b42835dbSDavid S. Miller if (IS_ERR(dst)) 4821da177e4SLinus Torvalds goto out; 4838de3351eSYOSHIFUJI Hideaki 4844c9483b2SDavid S. Miller if (ipv6_addr_is_multicast(&fl6.daddr)) 4851da177e4SLinus Torvalds hlimit = np->mcast_hops; 4861da177e4SLinus Torvalds else 4871da177e4SLinus Torvalds hlimit = np->hop_limit; 4881da177e4SLinus Torvalds if (hlimit < 0) 4896b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 4901da177e4SLinus Torvalds 4911da177e4SLinus Torvalds msg.skb = skb; 492bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 493763ecff1SYasuyuki Kozakai msg.type = type; 4941da177e4SLinus Torvalds 4951da177e4SLinus Torvalds len = skb->len - msg.offset; 4961da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); 4971da177e4SLinus Torvalds if (len < 0) { 49864ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n"); 4991da177e4SLinus Torvalds goto out_dst_release; 5001da177e4SLinus Torvalds } 5011da177e4SLinus Torvalds 502cfdf7647SEric Dumazet rcu_read_lock(); 503cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 5041da177e4SLinus Torvalds 5051da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, 5061da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 507e651f03aSGerrit Renker sizeof(struct icmp6hdr), hlimit, 5084c9483b2SDavid S. Miller np->tclass, NULL, &fl6, (struct rt6_info *)dst, 50913b52cd4SBrian Haley MSG_DONTWAIT, np->dontfrag); 5101da177e4SLinus Torvalds if (err) { 51100d9d6a1SEric Dumazet ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS); 5121da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 513cfdf7647SEric Dumazet } else { 514cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 515cfdf7647SEric Dumazet len + sizeof(struct icmp6hdr)); 5161da177e4SLinus Torvalds } 517cfdf7647SEric Dumazet rcu_read_unlock(); 5181da177e4SLinus Torvalds out_dst_release: 5191da177e4SLinus Torvalds dst_release(dst); 5201da177e4SLinus Torvalds out: 521405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5221da177e4SLinus Torvalds } 5235f5624cfSPravin B Shelar 5245f5624cfSPravin B Shelar /* Slightly more convenient version of icmp6_send. 5255f5624cfSPravin B Shelar */ 5265f5624cfSPravin B Shelar void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) 5275f5624cfSPravin B Shelar { 5285f5624cfSPravin B Shelar icmp6_send(skb, ICMPV6_PARAMPROB, code, pos); 5295f5624cfSPravin B Shelar kfree_skb(skb); 5305f5624cfSPravin B Shelar } 5317159039aSYOSHIFUJI Hideaki 5321da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 5331da177e4SLinus Torvalds { 534c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 53584427d53SYOSHIFUJI Hideaki struct sock *sk; 5361da177e4SLinus Torvalds struct inet6_dev *idev; 53784427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 538b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 539cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 5401da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 5414c9483b2SDavid S. Miller struct flowi6 fl6; 5421da177e4SLinus Torvalds struct icmpv6_msg msg; 5431da177e4SLinus Torvalds struct dst_entry *dst; 5441da177e4SLinus Torvalds int err = 0; 5451da177e4SLinus Torvalds int hlimit; 5461da177e4SLinus Torvalds 5470660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds if (!ipv6_unicast_destination(skb)) 5501da177e4SLinus Torvalds saddr = NULL; 5511da177e4SLinus Torvalds 5521da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 5531da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 5541da177e4SLinus Torvalds 5554c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 5564c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 5574e3fd7a0SAlexey Dobriyan fl6.daddr = ipv6_hdr(skb)->saddr; 5581da177e4SLinus Torvalds if (saddr) 5594e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 5604c9483b2SDavid S. Miller fl6.flowi6_oif = skb->dev->ifindex; 5611958b856SDavid S. Miller fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; 5624c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 5631da177e4SLinus Torvalds 564fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 565fdc0bde9SDenis V. Lunev if (sk == NULL) 566405666dbSDenis V. Lunev return; 567fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 568405666dbSDenis V. Lunev 5694c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 5704c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 571c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 572c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 5731da177e4SLinus Torvalds 5744c9483b2SDavid S. Miller err = ip6_dst_lookup(sk, &dst, &fl6); 5751da177e4SLinus Torvalds if (err) 5761da177e4SLinus Torvalds goto out; 5774c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); 578452edd59SDavid S. Miller if (IS_ERR(dst)) 579e104411bSPatrick McHardy goto out; 5801da177e4SLinus Torvalds 5814c9483b2SDavid S. Miller if (ipv6_addr_is_multicast(&fl6.daddr)) 5821da177e4SLinus Torvalds hlimit = np->mcast_hops; 5831da177e4SLinus Torvalds else 5841da177e4SLinus Torvalds hlimit = np->hop_limit; 5851da177e4SLinus Torvalds if (hlimit < 0) 5866b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 5871da177e4SLinus Torvalds 588cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 5891da177e4SLinus Torvalds 5901da177e4SLinus Torvalds msg.skb = skb; 5911da177e4SLinus Torvalds msg.offset = 0; 592763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 5931da177e4SLinus Torvalds 5941da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 5954c9483b2SDavid S. Miller sizeof(struct icmp6hdr), hlimit, np->tclass, NULL, &fl6, 59613b52cd4SBrian Haley (struct rt6_info *)dst, MSG_DONTWAIT, 59713b52cd4SBrian Haley np->dontfrag); 5981da177e4SLinus Torvalds 5991da177e4SLinus Torvalds if (err) { 60000d9d6a1SEric Dumazet ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS); 6011da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 602cfdf7647SEric Dumazet } else { 603cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 604cfdf7647SEric Dumazet skb->len + sizeof(struct icmp6hdr)); 6051da177e4SLinus Torvalds } 6061da177e4SLinus Torvalds dst_release(dst); 6071da177e4SLinus Torvalds out: 608405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 6091da177e4SLinus Torvalds } 6101da177e4SLinus Torvalds 611b94f1c09SDavid S. Miller void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 6121da177e4SLinus Torvalds { 61341135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 6141da177e4SLinus Torvalds int inner_offset; 61575f2811cSJesse Gross __be16 frag_off; 616f9242b6bSDavid S. Miller u8 nexthdr; 6171da177e4SLinus Torvalds 6181da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 6191da177e4SLinus Torvalds return; 6201da177e4SLinus Torvalds 6211da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 6221da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 6231da177e4SLinus Torvalds /* now skip over extension headers */ 62475f2811cSJesse Gross inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 62575f2811cSJesse Gross &nexthdr, &frag_off); 6261da177e4SLinus Torvalds if (inner_offset<0) 6271da177e4SLinus Torvalds return; 6281da177e4SLinus Torvalds } else { 6291da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 6301da177e4SLinus Torvalds } 6311da177e4SLinus Torvalds 6321da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 6331da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 6341da177e4SLinus Torvalds return; 6351da177e4SLinus Torvalds 6361da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 6371da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 6381da177e4SLinus Torvalds pmtu discovery. 6391da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 6401da177e4SLinus Torvalds --ANK (980726) 6411da177e4SLinus Torvalds */ 6421da177e4SLinus Torvalds 6431da177e4SLinus Torvalds rcu_read_lock(); 644f9242b6bSDavid S. Miller ipprot = rcu_dereference(inet6_protos[nexthdr]); 6451da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 6461da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 6471da177e4SLinus Torvalds rcu_read_unlock(); 6481da177e4SLinus Torvalds 64969d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 6501da177e4SLinus Torvalds } 6511da177e4SLinus Torvalds 6521da177e4SLinus Torvalds /* 6531da177e4SLinus Torvalds * Handle icmp messages 6541da177e4SLinus Torvalds */ 6551da177e4SLinus Torvalds 656e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 6571da177e4SLinus Torvalds { 6581da177e4SLinus Torvalds struct net_device *dev = skb->dev; 6591da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 660b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 6611da177e4SLinus Torvalds struct icmp6hdr *hdr; 662d5fdd6baSBrian Haley u8 type; 6631da177e4SLinus Torvalds 664aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 665def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 6668b7817f3SHerbert Xu int nh; 6678b7817f3SHerbert Xu 668def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 669aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 670aebcf82cSHerbert Xu goto drop_no_count; 671aebcf82cSHerbert Xu 67281aded24SDavid S. Miller if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) 6738b7817f3SHerbert Xu goto drop_no_count; 6748b7817f3SHerbert Xu 6758b7817f3SHerbert Xu nh = skb_network_offset(skb); 6768b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 6778b7817f3SHerbert Xu 6788b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 6798b7817f3SHerbert Xu goto drop_no_count; 6808b7817f3SHerbert Xu 6818b7817f3SHerbert Xu skb_set_network_header(skb, nh); 6828b7817f3SHerbert Xu } 6838b7817f3SHerbert Xu 684e41b5368SDenis V. Lunev ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INMSGS); 6851da177e4SLinus Torvalds 6860660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 6870660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 6881da177e4SLinus Torvalds 6891da177e4SLinus Torvalds /* Perform checksum. */ 690fb286bb2SHerbert Xu switch (skb->ip_summed) { 69184fa7933SPatrick McHardy case CHECKSUM_COMPLETE: 692fb286bb2SHerbert Xu if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, 693fb286bb2SHerbert Xu skb->csum)) 694fb286bb2SHerbert Xu break; 695fb286bb2SHerbert Xu /* fall through */ 696fb286bb2SHerbert Xu case CHECKSUM_NONE: 697868c86bcSAl Viro skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len, 698868c86bcSAl Viro IPPROTO_ICMPV6, 0)); 699fb286bb2SHerbert Xu if (__skb_checksum_complete(skb)) { 7005b095d98SHarvey Harrison LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [%pI6 > %pI6]\n", 7010c6ce78aSHarvey Harrison saddr, daddr); 7026a5dc9e5SEric Dumazet goto csum_error; 7031da177e4SLinus Torvalds } 7041da177e4SLinus Torvalds } 7051da177e4SLinus Torvalds 7068cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 7078cf22943SHerbert Xu goto discard_it; 7081da177e4SLinus Torvalds 709cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 7101da177e4SLinus Torvalds 7111da177e4SLinus Torvalds type = hdr->icmp6_type; 7121da177e4SLinus Torvalds 71355d43808SDenis V. Lunev ICMP6MSGIN_INC_STATS_BH(dev_net(dev), idev, type); 7141da177e4SLinus Torvalds 7151da177e4SLinus Torvalds switch (type) { 7161da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 7171da177e4SLinus Torvalds icmpv6_echo_reply(skb); 7181da177e4SLinus Torvalds break; 7191da177e4SLinus Torvalds 7201da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 7211da177e4SLinus Torvalds /* we couldn't care less */ 7221da177e4SLinus Torvalds break; 7231da177e4SLinus Torvalds 7241da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 7251da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 7261da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 7271da177e4SLinus Torvalds destination cache will allow to solve this problem 7281da177e4SLinus Torvalds --ANK (980726) 7291da177e4SLinus Torvalds */ 7301da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 7311da177e4SLinus Torvalds goto discard_it; 732cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 7331da177e4SLinus Torvalds 7341da177e4SLinus Torvalds /* 7351da177e4SLinus Torvalds * Drop through to notify 7361da177e4SLinus Torvalds */ 7371da177e4SLinus Torvalds 7381da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 7391da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 7401da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 7411da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7421da177e4SLinus Torvalds break; 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 7451da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 7461da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 7471da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 7481da177e4SLinus Torvalds case NDISC_REDIRECT: 7491da177e4SLinus Torvalds ndisc_rcv(skb); 7501da177e4SLinus Torvalds break; 7511da177e4SLinus Torvalds 7521da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 7531da177e4SLinus Torvalds igmp6_event_query(skb); 7541da177e4SLinus Torvalds break; 7551da177e4SLinus Torvalds 7561da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 7571da177e4SLinus Torvalds igmp6_event_report(skb); 7581da177e4SLinus Torvalds break; 7591da177e4SLinus Torvalds 7601da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 7611da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 7621da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 7631da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 7641da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 7651da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 7661da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 7671da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 7681da177e4SLinus Torvalds break; 7691da177e4SLinus Torvalds 7701da177e4SLinus Torvalds default: 77164ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n"); 7721da177e4SLinus Torvalds 7731da177e4SLinus Torvalds /* informational */ 7741da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 7751da177e4SLinus Torvalds break; 7761da177e4SLinus Torvalds 7771da177e4SLinus Torvalds /* 7781da177e4SLinus Torvalds * error of unknown type. 7791da177e4SLinus Torvalds * must pass to upper level 7801da177e4SLinus Torvalds */ 7811da177e4SLinus Torvalds 7821da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7833ff50b79SStephen Hemminger } 7843ff50b79SStephen Hemminger 7851da177e4SLinus Torvalds kfree_skb(skb); 7861da177e4SLinus Torvalds return 0; 7871da177e4SLinus Torvalds 7886a5dc9e5SEric Dumazet csum_error: 7896a5dc9e5SEric Dumazet ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); 7901da177e4SLinus Torvalds discard_it: 791e41b5368SDenis V. Lunev ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INERRORS); 7928b7817f3SHerbert Xu drop_no_count: 7931da177e4SLinus Torvalds kfree_skb(skb); 7941da177e4SLinus Torvalds return 0; 7951da177e4SLinus Torvalds } 7961da177e4SLinus Torvalds 7974c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, 79895e41e93SYOSHIFUJI Hideaki u8 type, 79995e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 80095e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 80195e41e93SYOSHIFUJI Hideaki int oif) 80295e41e93SYOSHIFUJI Hideaki { 8034c9483b2SDavid S. Miller memset(fl6, 0, sizeof(*fl6)); 8044e3fd7a0SAlexey Dobriyan fl6->saddr = *saddr; 8054e3fd7a0SAlexey Dobriyan fl6->daddr = *daddr; 8064c9483b2SDavid S. Miller fl6->flowi6_proto = IPPROTO_ICMPV6; 8071958b856SDavid S. Miller fl6->fl6_icmp_type = type; 8081958b856SDavid S. Miller fl6->fl6_icmp_code = 0; 8094c9483b2SDavid S. Miller fl6->flowi6_oif = oif; 8104c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); 81195e41e93SYOSHIFUJI Hideaki } 81295e41e93SYOSHIFUJI Hideaki 813640c41c7SIngo Molnar /* 814b7e729c4SDenis V. Lunev * Special lock-class for __icmpv6_sk: 815640c41c7SIngo Molnar */ 816640c41c7SIngo Molnar static struct lock_class_key icmpv6_socket_sk_dst_lock_key; 817640c41c7SIngo Molnar 81898c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 8191da177e4SLinus Torvalds { 8201da177e4SLinus Torvalds struct sock *sk; 8211da177e4SLinus Torvalds int err, i, j; 8221da177e4SLinus Torvalds 82398c6d1b2SDenis V. Lunev net->ipv6.icmp_sk = 82498c6d1b2SDenis V. Lunev kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); 82598c6d1b2SDenis V. Lunev if (net->ipv6.icmp_sk == NULL) 82679c91159SDenis V. Lunev return -ENOMEM; 82779c91159SDenis V. Lunev 8286f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8291ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 8301ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 8311da177e4SLinus Torvalds if (err < 0) { 832f3213831SJoe Perches pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", 8331da177e4SLinus Torvalds err); 8341da177e4SLinus Torvalds goto fail; 8351da177e4SLinus Torvalds } 8361da177e4SLinus Torvalds 8371ed8516fSDenis V. Lunev net->ipv6.icmp_sk[i] = sk; 8385c8cafd6SDenis V. Lunev 839640c41c7SIngo Molnar /* 840640c41c7SIngo Molnar * Split off their lock-class, because sk->sk_dst_lock 841640c41c7SIngo Molnar * gets used from softirqs, which is safe for 842b7e729c4SDenis V. Lunev * __icmpv6_sk (because those never get directly used 843640c41c7SIngo Molnar * via userspace syscalls), but unsafe for normal sockets. 844640c41c7SIngo Molnar */ 845640c41c7SIngo Molnar lockdep_set_class(&sk->sk_dst_lock, 846640c41c7SIngo Molnar &icmpv6_socket_sk_dst_lock_key); 8471da177e4SLinus Torvalds 8481da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 8491da177e4SLinus Torvalds * sk_buff struct overhead. 8501da177e4SLinus Torvalds */ 85187fb4b7bSEric Dumazet sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); 8521da177e4SLinus Torvalds } 8531da177e4SLinus Torvalds return 0; 8541da177e4SLinus Torvalds 8551da177e4SLinus Torvalds fail: 8565c8cafd6SDenis V. Lunev for (j = 0; j < i; j++) 8571ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); 85898c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 8591da177e4SLinus Torvalds return err; 8601da177e4SLinus Torvalds } 8611da177e4SLinus Torvalds 86298c6d1b2SDenis V. Lunev static void __net_exit icmpv6_sk_exit(struct net *net) 8631da177e4SLinus Torvalds { 8641da177e4SLinus Torvalds int i; 8651da177e4SLinus Torvalds 8666f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8671ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); 8681da177e4SLinus Torvalds } 86998c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 87098c6d1b2SDenis V. Lunev } 87198c6d1b2SDenis V. Lunev 8728ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 87398c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 87498c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 87598c6d1b2SDenis V. Lunev }; 87698c6d1b2SDenis V. Lunev 87798c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 87898c6d1b2SDenis V. Lunev { 87998c6d1b2SDenis V. Lunev int err; 88098c6d1b2SDenis V. Lunev 88198c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 88298c6d1b2SDenis V. Lunev if (err < 0) 88398c6d1b2SDenis V. Lunev return err; 88498c6d1b2SDenis V. Lunev 88598c6d1b2SDenis V. Lunev err = -EAGAIN; 88698c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 88798c6d1b2SDenis V. Lunev goto fail; 8885f5624cfSPravin B Shelar 8895f5624cfSPravin B Shelar err = inet6_register_icmp_sender(icmp6_send); 8905f5624cfSPravin B Shelar if (err) 8915f5624cfSPravin B Shelar goto sender_reg_err; 89298c6d1b2SDenis V. Lunev return 0; 89398c6d1b2SDenis V. Lunev 8945f5624cfSPravin B Shelar sender_reg_err: 8955f5624cfSPravin B Shelar inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 89698c6d1b2SDenis V. Lunev fail: 897f3213831SJoe Perches pr_err("Failed to register ICMP6 protocol\n"); 89898c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 89998c6d1b2SDenis V. Lunev return err; 90098c6d1b2SDenis V. Lunev } 90198c6d1b2SDenis V. Lunev 9028ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 90398c6d1b2SDenis V. Lunev { 9045f5624cfSPravin B Shelar inet6_unregister_icmp_sender(icmp6_send); 90598c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 9061da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 9071da177e4SLinus Torvalds } 9081da177e4SLinus Torvalds 90998c6d1b2SDenis V. Lunev 9109b5b5cffSArjan van de Ven static const struct icmp6_err { 9111da177e4SLinus Torvalds int err; 9121da177e4SLinus Torvalds int fatal; 9131da177e4SLinus Torvalds } tab_unreach[] = { 9141da177e4SLinus Torvalds { /* NOROUTE */ 9151da177e4SLinus Torvalds .err = ENETUNREACH, 9161da177e4SLinus Torvalds .fatal = 0, 9171da177e4SLinus Torvalds }, 9181da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 9191da177e4SLinus Torvalds .err = EACCES, 9201da177e4SLinus Torvalds .fatal = 1, 9211da177e4SLinus Torvalds }, 9221da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 9231da177e4SLinus Torvalds .err = EHOSTUNREACH, 9241da177e4SLinus Torvalds .fatal = 0, 9251da177e4SLinus Torvalds }, 9261da177e4SLinus Torvalds { /* ADDR_UNREACH */ 9271da177e4SLinus Torvalds .err = EHOSTUNREACH, 9281da177e4SLinus Torvalds .fatal = 0, 9291da177e4SLinus Torvalds }, 9301da177e4SLinus Torvalds { /* PORT_UNREACH */ 9311da177e4SLinus Torvalds .err = ECONNREFUSED, 9321da177e4SLinus Torvalds .fatal = 1, 9331da177e4SLinus Torvalds }, 9341da177e4SLinus Torvalds }; 9351da177e4SLinus Torvalds 936d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 9371da177e4SLinus Torvalds { 9381da177e4SLinus Torvalds int fatal = 0; 9391da177e4SLinus Torvalds 9401da177e4SLinus Torvalds *err = EPROTO; 9411da177e4SLinus Torvalds 9421da177e4SLinus Torvalds switch (type) { 9431da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 9441da177e4SLinus Torvalds fatal = 1; 9451da177e4SLinus Torvalds if (code <= ICMPV6_PORT_UNREACH) { 9461da177e4SLinus Torvalds *err = tab_unreach[code].err; 9471da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 9481da177e4SLinus Torvalds } 9491da177e4SLinus Torvalds break; 9501da177e4SLinus Torvalds 9511da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 9521da177e4SLinus Torvalds *err = EMSGSIZE; 9531da177e4SLinus Torvalds break; 9541da177e4SLinus Torvalds 9551da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 9561da177e4SLinus Torvalds *err = EPROTO; 9571da177e4SLinus Torvalds fatal = 1; 9581da177e4SLinus Torvalds break; 9591da177e4SLinus Torvalds 9601da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 9611da177e4SLinus Torvalds *err = EHOSTUNREACH; 9621da177e4SLinus Torvalds break; 9633ff50b79SStephen Hemminger } 9641da177e4SLinus Torvalds 9651da177e4SLinus Torvalds return fatal; 9661da177e4SLinus Torvalds } 9677159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 9687159039aSYOSHIFUJI Hideaki 9691da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 970760f2d01SDaniel Lezcano ctl_table ipv6_icmp_table_template[] = { 9711da177e4SLinus Torvalds { 9721da177e4SLinus Torvalds .procname = "ratelimit", 97341a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 9741da177e4SLinus Torvalds .maxlen = sizeof(int), 9751da177e4SLinus Torvalds .mode = 0644, 9766d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 9771da177e4SLinus Torvalds }, 978f8572d8fSEric W. Biederman { }, 9791da177e4SLinus Torvalds }; 980760f2d01SDaniel Lezcano 9812c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 982760f2d01SDaniel Lezcano { 983760f2d01SDaniel Lezcano struct ctl_table *table; 984760f2d01SDaniel Lezcano 985760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 986760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 987760f2d01SDaniel Lezcano GFP_KERNEL); 9885ee09105SYOSHIFUJI Hideaki 989c027aab4SEric W. Biederman if (table) 9905ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 9915ee09105SYOSHIFUJI Hideaki 992760f2d01SDaniel Lezcano return table; 993760f2d01SDaniel Lezcano } 9941da177e4SLinus Torvalds #endif 9951da177e4SLinus Torvalds 996