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 84e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb); 851da177e4SLinus Torvalds 8641135cc8SAlexey Dobriyan static const struct inet6_protocol icmpv6_protocol = { 871da177e4SLinus Torvalds .handler = icmpv6_rcv, 888b7817f3SHerbert Xu .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 891da177e4SLinus Torvalds }; 901da177e4SLinus Torvalds 91fdc0bde9SDenis V. Lunev static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) 921da177e4SLinus Torvalds { 93fdc0bde9SDenis V. Lunev struct sock *sk; 94fdc0bde9SDenis V. Lunev 951da177e4SLinus Torvalds local_bh_disable(); 961da177e4SLinus Torvalds 97fdc0bde9SDenis V. Lunev sk = icmpv6_sk(net); 98405666dbSDenis V. Lunev if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { 991da177e4SLinus Torvalds /* This can happen if the output path (f.e. SIT or 1001da177e4SLinus Torvalds * ip6ip6 tunnel) signals dst_link_failure() for an 1011da177e4SLinus Torvalds * outgoing ICMP6 packet. 1021da177e4SLinus Torvalds */ 1031da177e4SLinus Torvalds local_bh_enable(); 104fdc0bde9SDenis V. Lunev return NULL; 1051da177e4SLinus Torvalds } 106fdc0bde9SDenis V. Lunev return sk; 1071da177e4SLinus Torvalds } 1081da177e4SLinus Torvalds 109405666dbSDenis V. Lunev static __inline__ void icmpv6_xmit_unlock(struct sock *sk) 1101da177e4SLinus Torvalds { 111405666dbSDenis V. Lunev spin_unlock_bh(&sk->sk_lock.slock); 1121da177e4SLinus Torvalds } 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds /* 1151da177e4SLinus Torvalds * Slightly more convenient version of icmpv6_send. 1161da177e4SLinus Torvalds */ 117d5fdd6baSBrian Haley void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) 1181da177e4SLinus Torvalds { 1193ffe533cSAlexey Dobriyan icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos); 1201da177e4SLinus Torvalds kfree_skb(skb); 1211da177e4SLinus Torvalds } 1221da177e4SLinus Torvalds 1231da177e4SLinus Torvalds /* 1241da177e4SLinus Torvalds * Figure out, may we reply to this packet with icmp error. 1251da177e4SLinus Torvalds * 1261da177e4SLinus Torvalds * We do not reply, if: 1271da177e4SLinus Torvalds * - it was icmp error message. 1281da177e4SLinus Torvalds * - it is truncated, so that it is known, that protocol is ICMPV6 1291da177e4SLinus Torvalds * (i.e. in the middle of some exthdr) 1301da177e4SLinus Torvalds * 1311da177e4SLinus Torvalds * --ANK (980726) 1321da177e4SLinus Torvalds */ 1331da177e4SLinus Torvalds 134a50feda5SEric Dumazet static bool is_ineligible(const struct sk_buff *skb) 1351da177e4SLinus Torvalds { 1360660e03fSArnaldo Carvalho de Melo int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; 1371da177e4SLinus Torvalds int len = skb->len - ptr; 1380660e03fSArnaldo Carvalho de Melo __u8 nexthdr = ipv6_hdr(skb)->nexthdr; 13975f2811cSJesse Gross __be16 frag_off; 1401da177e4SLinus Torvalds 1411da177e4SLinus Torvalds if (len < 0) 142a50feda5SEric Dumazet return true; 1431da177e4SLinus Torvalds 14475f2811cSJesse Gross ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off); 1451da177e4SLinus Torvalds if (ptr < 0) 146a50feda5SEric Dumazet return false; 1471da177e4SLinus Torvalds if (nexthdr == IPPROTO_ICMPV6) { 1481da177e4SLinus Torvalds u8 _type, *tp; 1491da177e4SLinus Torvalds tp = skb_header_pointer(skb, 1501da177e4SLinus Torvalds ptr+offsetof(struct icmp6hdr, icmp6_type), 1511da177e4SLinus Torvalds sizeof(_type), &_type); 1521da177e4SLinus Torvalds if (tp == NULL || 1531da177e4SLinus Torvalds !(*tp & ICMPV6_INFOMSG_MASK)) 154a50feda5SEric Dumazet return true; 1551da177e4SLinus Torvalds } 156a50feda5SEric Dumazet return false; 1571da177e4SLinus Torvalds } 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds /* 1601da177e4SLinus Torvalds * Check the ICMP output rate limit 1611da177e4SLinus Torvalds */ 16292d86829SDavid S. Miller static inline bool icmpv6_xrlim_allow(struct sock *sk, u8 type, 1634c9483b2SDavid S. Miller struct flowi6 *fl6) 1641da177e4SLinus Torvalds { 1651da177e4SLinus Torvalds struct dst_entry *dst; 1663b1e0a65SYOSHIFUJI Hideaki struct net *net = sock_net(sk); 16792d86829SDavid S. Miller bool res = false; 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvalds /* Informational messages are not limited. */ 1701da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 17192d86829SDavid S. Miller return true; 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds /* Do not limit pmtu discovery, it would break it. */ 1741da177e4SLinus Torvalds if (type == ICMPV6_PKT_TOOBIG) 17592d86829SDavid S. Miller return true; 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds /* 1781da177e4SLinus Torvalds * Look up the output route. 1791da177e4SLinus Torvalds * XXX: perhaps the expire for routing entries cloned by 1801da177e4SLinus Torvalds * this lookup should be more aggressive (not longer than timeout). 1811da177e4SLinus Torvalds */ 1824c9483b2SDavid S. Miller dst = ip6_route_output(net, sk, fl6); 1831da177e4SLinus Torvalds if (dst->error) { 1843bd653c8SDenis V. Lunev IP6_INC_STATS(net, ip6_dst_idev(dst), 185a11d206dSYOSHIFUJI Hideaki IPSTATS_MIB_OUTNOROUTES); 1861da177e4SLinus Torvalds } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { 18792d86829SDavid S. Miller res = true; 1881da177e4SLinus Torvalds } else { 1891da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 1909a43b709SBenjamin Thery int tmo = net->ipv6.sysctl.icmpv6_time; 191fbfe95a4SDavid S. Miller struct inet_peer *peer; 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds /* Give more bandwidth to wider prefixes. */ 1941da177e4SLinus Torvalds if (rt->rt6i_dst.plen < 128) 1951da177e4SLinus Torvalds tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 1961da177e4SLinus Torvalds 197fbfe95a4SDavid S. Miller peer = rt6_get_peer_create(rt); 198fbfe95a4SDavid S. Miller res = inet_peer_xrlim_allow(peer, tmo); 1991da177e4SLinus Torvalds } 2001da177e4SLinus Torvalds dst_release(dst); 2011da177e4SLinus Torvalds return res; 2021da177e4SLinus Torvalds } 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds /* 2051da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2061da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2071da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2081da177e4SLinus Torvalds * highest-order two bits set to 10 2091da177e4SLinus Torvalds */ 2101da177e4SLinus Torvalds 211a50feda5SEric Dumazet static bool opt_unrec(struct sk_buff *skb, __u32 offset) 2121da177e4SLinus Torvalds { 2131da177e4SLinus Torvalds u8 _optval, *op; 2141da177e4SLinus Torvalds 215bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2161da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 2171da177e4SLinus Torvalds if (op == NULL) 218a50feda5SEric Dumazet return true; 2191da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2201da177e4SLinus Torvalds } 2211da177e4SLinus Torvalds 2224c9483b2SDavid S. Miller static int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, struct icmp6hdr *thdr, int len) 2231da177e4SLinus Torvalds { 2241da177e4SLinus Torvalds struct sk_buff *skb; 2251da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2261da177e4SLinus Torvalds int err = 0; 2271da177e4SLinus Torvalds 2281da177e4SLinus Torvalds if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 2291da177e4SLinus Torvalds goto out; 2301da177e4SLinus Torvalds 231cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2321da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2331da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2341da177e4SLinus Torvalds 2351da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 23607f0757aSJoe Perches skb->csum = csum_partial(icmp6h, 2371da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2384c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2394c9483b2SDavid S. Miller &fl6->daddr, 2404c9483b2SDavid S. Miller len, fl6->flowi6_proto, 2411da177e4SLinus Torvalds skb->csum); 2421da177e4SLinus Torvalds } else { 243868c86bcSAl Viro __wsum tmp_csum = 0; 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2461da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2471da177e4SLinus Torvalds } 2481da177e4SLinus Torvalds 24907f0757aSJoe Perches tmp_csum = csum_partial(icmp6h, 2501da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 2514c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2524c9483b2SDavid S. Miller &fl6->daddr, 2534c9483b2SDavid S. Miller len, fl6->flowi6_proto, 254868c86bcSAl Viro tmp_csum); 2551da177e4SLinus Torvalds } 2561da177e4SLinus Torvalds ip6_push_pending_frames(sk); 2571da177e4SLinus Torvalds out: 2581da177e4SLinus Torvalds return err; 2591da177e4SLinus Torvalds } 2601da177e4SLinus Torvalds 2611da177e4SLinus Torvalds struct icmpv6_msg { 2621da177e4SLinus Torvalds struct sk_buff *skb; 2631da177e4SLinus Torvalds int offset; 264763ecff1SYasuyuki Kozakai uint8_t type; 2651da177e4SLinus Torvalds }; 2661da177e4SLinus Torvalds 2671da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 2681da177e4SLinus Torvalds { 2691da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 2701da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 2715f92a738SAl Viro __wsum csum = 0; 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 2741da177e4SLinus Torvalds to, len, csum); 2751da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 276763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 277763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 2781da177e4SLinus Torvalds return 0; 2791da177e4SLinus Torvalds } 2801da177e4SLinus Torvalds 28159fbb3a6SMasahide NAKAMURA #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 28279383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 28379383236SMasahide NAKAMURA { 2840660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 28579383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 28679383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 28779383236SMasahide NAKAMURA struct in6_addr tmp; 28879383236SMasahide NAKAMURA int off; 28979383236SMasahide NAKAMURA 29079383236SMasahide NAKAMURA if (opt->dsthao) { 29179383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 29279383236SMasahide NAKAMURA if (likely(off >= 0)) { 293d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 294d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 2954e3fd7a0SAlexey Dobriyan tmp = iph->saddr; 2964e3fd7a0SAlexey Dobriyan iph->saddr = hao->addr; 2974e3fd7a0SAlexey Dobriyan hao->addr = tmp; 29879383236SMasahide NAKAMURA } 29979383236SMasahide NAKAMURA } 30079383236SMasahide NAKAMURA } 30179383236SMasahide NAKAMURA #else 30279383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 30379383236SMasahide NAKAMURA #endif 30479383236SMasahide NAKAMURA 305b42835dbSDavid S. Miller static struct dst_entry *icmpv6_route_lookup(struct net *net, struct sk_buff *skb, 3064c9483b2SDavid S. Miller struct sock *sk, struct flowi6 *fl6) 307b42835dbSDavid S. Miller { 308b42835dbSDavid S. Miller struct dst_entry *dst, *dst2; 3094c9483b2SDavid S. Miller struct flowi6 fl2; 310b42835dbSDavid S. Miller int err; 311b42835dbSDavid S. Miller 3124c9483b2SDavid S. Miller err = ip6_dst_lookup(sk, &dst, fl6); 313b42835dbSDavid S. Miller if (err) 314b42835dbSDavid S. Miller return ERR_PTR(err); 315b42835dbSDavid S. Miller 316b42835dbSDavid S. Miller /* 317b42835dbSDavid S. Miller * We won't send icmp if the destination is known 318b42835dbSDavid S. Miller * anycast. 319b42835dbSDavid S. Miller */ 320b42835dbSDavid S. Miller if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { 321b42835dbSDavid S. Miller LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n"); 322b42835dbSDavid S. Miller dst_release(dst); 323b42835dbSDavid S. Miller return ERR_PTR(-EINVAL); 324b42835dbSDavid S. Miller } 325b42835dbSDavid S. Miller 326b42835dbSDavid S. Miller /* No need to clone since we're just using its address. */ 327b42835dbSDavid S. Miller dst2 = dst; 328b42835dbSDavid S. Miller 3294c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); 330452edd59SDavid S. Miller if (!IS_ERR(dst)) { 331b42835dbSDavid S. Miller if (dst != dst2) 332b42835dbSDavid S. Miller return dst; 333452edd59SDavid S. Miller } else { 334452edd59SDavid S. Miller if (PTR_ERR(dst) == -EPERM) 335b42835dbSDavid S. Miller dst = NULL; 336452edd59SDavid S. Miller else 337452edd59SDavid S. Miller return dst; 338b42835dbSDavid S. Miller } 339b42835dbSDavid S. Miller 3404c9483b2SDavid S. Miller err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); 341b42835dbSDavid S. Miller if (err) 342b42835dbSDavid S. Miller goto relookup_failed; 343b42835dbSDavid S. Miller 344b42835dbSDavid S. Miller err = ip6_dst_lookup(sk, &dst2, &fl2); 345b42835dbSDavid S. Miller if (err) 346b42835dbSDavid S. Miller goto relookup_failed; 347b42835dbSDavid S. Miller 3484c9483b2SDavid S. Miller dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); 349452edd59SDavid S. Miller if (!IS_ERR(dst2)) { 350b42835dbSDavid S. Miller dst_release(dst); 351b42835dbSDavid S. Miller dst = dst2; 352452edd59SDavid S. Miller } else { 353452edd59SDavid S. Miller err = PTR_ERR(dst2); 354452edd59SDavid S. Miller if (err == -EPERM) { 355b42835dbSDavid S. Miller dst_release(dst); 356452edd59SDavid S. Miller return dst2; 357452edd59SDavid S. Miller } else 358b42835dbSDavid S. Miller goto relookup_failed; 359b42835dbSDavid S. Miller } 360b42835dbSDavid S. Miller 361b42835dbSDavid S. Miller relookup_failed: 362b42835dbSDavid S. Miller if (dst) 363b42835dbSDavid S. Miller return dst; 364b42835dbSDavid S. Miller return ERR_PTR(err); 365b42835dbSDavid S. Miller } 366b42835dbSDavid S. Miller 3671da177e4SLinus Torvalds /* 3681da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 3691da177e4SLinus Torvalds */ 3703ffe533cSAlexey Dobriyan void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info) 3711da177e4SLinus Torvalds { 372c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 3731da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 3740660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 37584427d53SYOSHIFUJI Hideaki struct sock *sk; 37684427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 377b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 3781da177e4SLinus Torvalds struct dst_entry *dst; 3791da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 3804c9483b2SDavid S. Miller struct flowi6 fl6; 3811da177e4SLinus Torvalds struct icmpv6_msg msg; 3821da177e4SLinus Torvalds int iif = 0; 3831da177e4SLinus Torvalds int addr_type = 0; 3841da177e4SLinus Torvalds int len; 385e651f03aSGerrit Renker int hlimit; 3861da177e4SLinus Torvalds int err = 0; 3871da177e4SLinus Torvalds 38827a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 38927a884dcSArnaldo Carvalho de Melo (skb->network_header + sizeof(*hdr)) > skb->tail) 3901da177e4SLinus Torvalds return; 3911da177e4SLinus Torvalds 3921da177e4SLinus Torvalds /* 3931da177e4SLinus Torvalds * Make sure we respect the rules 3941da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 3951da177e4SLinus Torvalds * Rule (e.1) is enforced by not using icmpv6_send 3961da177e4SLinus Torvalds * in any code that processes icmp errors. 3971da177e4SLinus Torvalds */ 3981da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 3991da177e4SLinus Torvalds 4009a43b709SBenjamin Thery if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0)) 4011da177e4SLinus Torvalds saddr = &hdr->daddr; 4021da177e4SLinus Torvalds 4031da177e4SLinus Torvalds /* 4041da177e4SLinus Torvalds * Dest addr check 4051da177e4SLinus Torvalds */ 4061da177e4SLinus Torvalds 4071da177e4SLinus Torvalds if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) { 4081da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 4091da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 4101da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 4111da177e4SLinus Torvalds (opt_unrec(skb, info)))) 4121da177e4SLinus Torvalds return; 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds saddr = NULL; 4151da177e4SLinus Torvalds } 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 4181da177e4SLinus Torvalds 4191da177e4SLinus Torvalds /* 4201da177e4SLinus Torvalds * Source addr check 4211da177e4SLinus Torvalds */ 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds if (addr_type & IPV6_ADDR_LINKLOCAL) 4241da177e4SLinus Torvalds iif = skb->dev->ifindex; 4251da177e4SLinus Torvalds 4261da177e4SLinus Torvalds /* 4278de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 4288de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 4298de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 4308de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 4311da177e4SLinus Torvalds */ 4321da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 43364ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n"); 4341da177e4SLinus Torvalds return; 4351da177e4SLinus Torvalds } 4361da177e4SLinus Torvalds 4371da177e4SLinus Torvalds /* 4381da177e4SLinus Torvalds * Never answer to a ICMP packet. 4391da177e4SLinus Torvalds */ 4401da177e4SLinus Torvalds if (is_ineligible(skb)) { 44164ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n"); 4421da177e4SLinus Torvalds return; 4431da177e4SLinus Torvalds } 4441da177e4SLinus Torvalds 44579383236SMasahide NAKAMURA mip6_addr_swap(skb); 44679383236SMasahide NAKAMURA 4474c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 4484c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 4494e3fd7a0SAlexey Dobriyan fl6.daddr = hdr->saddr; 4501da177e4SLinus Torvalds if (saddr) 4514e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 4524c9483b2SDavid S. Miller fl6.flowi6_oif = iif; 4531958b856SDavid S. Miller fl6.fl6_icmp_type = type; 4541958b856SDavid S. Miller fl6.fl6_icmp_code = code; 4554c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 4561da177e4SLinus Torvalds 457fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 458fdc0bde9SDenis V. Lunev if (sk == NULL) 459405666dbSDenis V. Lunev return; 460fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 461405666dbSDenis V. Lunev 4624c9483b2SDavid S. Miller if (!icmpv6_xrlim_allow(sk, type, &fl6)) 4631da177e4SLinus Torvalds goto out; 4641da177e4SLinus Torvalds 4651da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 4661da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 4671da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 4681da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 4691da177e4SLinus Torvalds 4704c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 4714c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 472c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 473c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 4741da177e4SLinus Torvalds 4754c9483b2SDavid S. Miller dst = icmpv6_route_lookup(net, skb, sk, &fl6); 476b42835dbSDavid S. Miller if (IS_ERR(dst)) 4771da177e4SLinus Torvalds goto out; 4788de3351eSYOSHIFUJI Hideaki 4794c9483b2SDavid S. Miller if (ipv6_addr_is_multicast(&fl6.daddr)) 4801da177e4SLinus Torvalds hlimit = np->mcast_hops; 4811da177e4SLinus Torvalds else 4821da177e4SLinus Torvalds hlimit = np->hop_limit; 4831da177e4SLinus Torvalds if (hlimit < 0) 4846b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 4851da177e4SLinus Torvalds 4861da177e4SLinus Torvalds msg.skb = skb; 487bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 488763ecff1SYasuyuki Kozakai msg.type = type; 4891da177e4SLinus Torvalds 4901da177e4SLinus Torvalds len = skb->len - msg.offset; 4911da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); 4921da177e4SLinus Torvalds if (len < 0) { 49364ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n"); 4941da177e4SLinus Torvalds goto out_dst_release; 4951da177e4SLinus Torvalds } 4961da177e4SLinus Torvalds 497cfdf7647SEric Dumazet rcu_read_lock(); 498cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 4991da177e4SLinus Torvalds 5001da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, 5011da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 502e651f03aSGerrit Renker sizeof(struct icmp6hdr), hlimit, 5034c9483b2SDavid S. Miller np->tclass, NULL, &fl6, (struct rt6_info *)dst, 50413b52cd4SBrian Haley MSG_DONTWAIT, np->dontfrag); 5051da177e4SLinus Torvalds if (err) { 50600d9d6a1SEric Dumazet ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS); 5071da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 508cfdf7647SEric Dumazet } else { 509cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 510cfdf7647SEric Dumazet len + sizeof(struct icmp6hdr)); 5111da177e4SLinus Torvalds } 512cfdf7647SEric Dumazet rcu_read_unlock(); 5131da177e4SLinus Torvalds out_dst_release: 5141da177e4SLinus Torvalds dst_release(dst); 5151da177e4SLinus Torvalds out: 516405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5171da177e4SLinus Torvalds } 5187159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_send); 5197159039aSYOSHIFUJI Hideaki 5201da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 5211da177e4SLinus Torvalds { 522c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 52384427d53SYOSHIFUJI Hideaki struct sock *sk; 5241da177e4SLinus Torvalds struct inet6_dev *idev; 52584427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 526b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 527cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 5281da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 5294c9483b2SDavid S. Miller struct flowi6 fl6; 5301da177e4SLinus Torvalds struct icmpv6_msg msg; 5311da177e4SLinus Torvalds struct dst_entry *dst; 5321da177e4SLinus Torvalds int err = 0; 5331da177e4SLinus Torvalds int hlimit; 5341da177e4SLinus Torvalds 5350660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 5361da177e4SLinus Torvalds 5371da177e4SLinus Torvalds if (!ipv6_unicast_destination(skb)) 5381da177e4SLinus Torvalds saddr = NULL; 5391da177e4SLinus Torvalds 5401da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 5411da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 5421da177e4SLinus Torvalds 5434c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 5444c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 5454e3fd7a0SAlexey Dobriyan fl6.daddr = ipv6_hdr(skb)->saddr; 5461da177e4SLinus Torvalds if (saddr) 5474e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 5484c9483b2SDavid S. Miller fl6.flowi6_oif = skb->dev->ifindex; 5491958b856SDavid S. Miller fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; 5504c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 5511da177e4SLinus Torvalds 552fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 553fdc0bde9SDenis V. Lunev if (sk == NULL) 554405666dbSDenis V. Lunev return; 555fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 556405666dbSDenis V. Lunev 5574c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 5584c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 559c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 560c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 5611da177e4SLinus Torvalds 5624c9483b2SDavid S. Miller err = ip6_dst_lookup(sk, &dst, &fl6); 5631da177e4SLinus Torvalds if (err) 5641da177e4SLinus Torvalds goto out; 5654c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); 566452edd59SDavid S. Miller if (IS_ERR(dst)) 567e104411bSPatrick McHardy goto out; 5681da177e4SLinus Torvalds 5694c9483b2SDavid S. Miller if (ipv6_addr_is_multicast(&fl6.daddr)) 5701da177e4SLinus Torvalds hlimit = np->mcast_hops; 5711da177e4SLinus Torvalds else 5721da177e4SLinus Torvalds hlimit = np->hop_limit; 5731da177e4SLinus Torvalds if (hlimit < 0) 5746b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 5751da177e4SLinus Torvalds 576cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 5771da177e4SLinus Torvalds 5781da177e4SLinus Torvalds msg.skb = skb; 5791da177e4SLinus Torvalds msg.offset = 0; 580763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 5834c9483b2SDavid S. Miller sizeof(struct icmp6hdr), hlimit, np->tclass, NULL, &fl6, 58413b52cd4SBrian Haley (struct rt6_info *)dst, MSG_DONTWAIT, 58513b52cd4SBrian Haley np->dontfrag); 5861da177e4SLinus Torvalds 5871da177e4SLinus Torvalds if (err) { 58800d9d6a1SEric Dumazet ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS); 5891da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 590cfdf7647SEric Dumazet } else { 591cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 592cfdf7647SEric Dumazet skb->len + sizeof(struct icmp6hdr)); 5931da177e4SLinus Torvalds } 5941da177e4SLinus Torvalds dst_release(dst); 5951da177e4SLinus Torvalds out: 596405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5971da177e4SLinus Torvalds } 5981da177e4SLinus Torvalds 599d5fdd6baSBrian Haley static void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 6001da177e4SLinus Torvalds { 60141135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 6021da177e4SLinus Torvalds int inner_offset; 60375f2811cSJesse Gross __be16 frag_off; 604f9242b6bSDavid S. Miller u8 nexthdr; 6051da177e4SLinus Torvalds 6061da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 6071da177e4SLinus Torvalds return; 6081da177e4SLinus Torvalds 6091da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 6101da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 6111da177e4SLinus Torvalds /* now skip over extension headers */ 61275f2811cSJesse Gross inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 61375f2811cSJesse Gross &nexthdr, &frag_off); 6141da177e4SLinus Torvalds if (inner_offset<0) 6151da177e4SLinus Torvalds return; 6161da177e4SLinus Torvalds } else { 6171da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 6181da177e4SLinus Torvalds } 6191da177e4SLinus Torvalds 6201da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 6211da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 6221da177e4SLinus Torvalds return; 6231da177e4SLinus Torvalds 6241da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 6251da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 6261da177e4SLinus Torvalds pmtu discovery. 6271da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 6281da177e4SLinus Torvalds --ANK (980726) 6291da177e4SLinus Torvalds */ 6301da177e4SLinus Torvalds 6311da177e4SLinus Torvalds rcu_read_lock(); 632f9242b6bSDavid S. Miller ipprot = rcu_dereference(inet6_protos[nexthdr]); 6331da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 6341da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 6351da177e4SLinus Torvalds rcu_read_unlock(); 6361da177e4SLinus Torvalds 63769d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 6381da177e4SLinus Torvalds } 6391da177e4SLinus Torvalds 6401da177e4SLinus Torvalds /* 6411da177e4SLinus Torvalds * Handle icmp messages 6421da177e4SLinus Torvalds */ 6431da177e4SLinus Torvalds 644e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 6451da177e4SLinus Torvalds { 6461da177e4SLinus Torvalds struct net_device *dev = skb->dev; 6471da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 648b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 6491da177e4SLinus Torvalds struct icmp6hdr *hdr; 650d5fdd6baSBrian Haley u8 type; 6511da177e4SLinus Torvalds 652aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 653def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 6548b7817f3SHerbert Xu int nh; 6558b7817f3SHerbert Xu 656def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 657aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 658aebcf82cSHerbert Xu goto drop_no_count; 659aebcf82cSHerbert Xu 66081aded24SDavid S. Miller if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) 6618b7817f3SHerbert Xu goto drop_no_count; 6628b7817f3SHerbert Xu 6638b7817f3SHerbert Xu nh = skb_network_offset(skb); 6648b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 6658b7817f3SHerbert Xu 6668b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 6678b7817f3SHerbert Xu goto drop_no_count; 6688b7817f3SHerbert Xu 6698b7817f3SHerbert Xu skb_set_network_header(skb, nh); 6708b7817f3SHerbert Xu } 6718b7817f3SHerbert Xu 672e41b5368SDenis V. Lunev ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INMSGS); 6731da177e4SLinus Torvalds 6740660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 6750660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 6761da177e4SLinus Torvalds 6771da177e4SLinus Torvalds /* Perform checksum. */ 678fb286bb2SHerbert Xu switch (skb->ip_summed) { 67984fa7933SPatrick McHardy case CHECKSUM_COMPLETE: 680fb286bb2SHerbert Xu if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, 681fb286bb2SHerbert Xu skb->csum)) 682fb286bb2SHerbert Xu break; 683fb286bb2SHerbert Xu /* fall through */ 684fb286bb2SHerbert Xu case CHECKSUM_NONE: 685868c86bcSAl Viro skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len, 686868c86bcSAl Viro IPPROTO_ICMPV6, 0)); 687fb286bb2SHerbert Xu if (__skb_checksum_complete(skb)) { 6885b095d98SHarvey Harrison LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [%pI6 > %pI6]\n", 6890c6ce78aSHarvey Harrison saddr, daddr); 6901da177e4SLinus Torvalds goto discard_it; 6911da177e4SLinus Torvalds } 6921da177e4SLinus Torvalds } 6931da177e4SLinus Torvalds 6948cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 6958cf22943SHerbert Xu goto discard_it; 6961da177e4SLinus Torvalds 697cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 6981da177e4SLinus Torvalds 6991da177e4SLinus Torvalds type = hdr->icmp6_type; 7001da177e4SLinus Torvalds 70155d43808SDenis V. Lunev ICMP6MSGIN_INC_STATS_BH(dev_net(dev), idev, type); 7021da177e4SLinus Torvalds 7031da177e4SLinus Torvalds switch (type) { 7041da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 7051da177e4SLinus Torvalds icmpv6_echo_reply(skb); 7061da177e4SLinus Torvalds break; 7071da177e4SLinus Torvalds 7081da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 7091da177e4SLinus Torvalds /* we couldn't care less */ 7101da177e4SLinus Torvalds break; 7111da177e4SLinus Torvalds 7121da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 7131da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 7141da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 7151da177e4SLinus Torvalds destination cache will allow to solve this problem 7161da177e4SLinus Torvalds --ANK (980726) 7171da177e4SLinus Torvalds */ 7181da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 7191da177e4SLinus Torvalds goto discard_it; 720cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds /* 7231da177e4SLinus Torvalds * Drop through to notify 7241da177e4SLinus Torvalds */ 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 7271da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 7281da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 7291da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7301da177e4SLinus Torvalds break; 7311da177e4SLinus Torvalds 7321da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 7331da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 7341da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 7351da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 7361da177e4SLinus Torvalds case NDISC_REDIRECT: 7371da177e4SLinus Torvalds ndisc_rcv(skb); 7381da177e4SLinus Torvalds break; 7391da177e4SLinus Torvalds 7401da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 7411da177e4SLinus Torvalds igmp6_event_query(skb); 7421da177e4SLinus Torvalds break; 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 7451da177e4SLinus Torvalds igmp6_event_report(skb); 7461da177e4SLinus Torvalds break; 7471da177e4SLinus Torvalds 7481da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 7491da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 7501da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 7511da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 7521da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 7531da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 7541da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 7551da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 7561da177e4SLinus Torvalds break; 7571da177e4SLinus Torvalds 7581da177e4SLinus Torvalds default: 75964ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n"); 7601da177e4SLinus Torvalds 7611da177e4SLinus Torvalds /* informational */ 7621da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 7631da177e4SLinus Torvalds break; 7641da177e4SLinus Torvalds 7651da177e4SLinus Torvalds /* 7661da177e4SLinus Torvalds * error of unknown type. 7671da177e4SLinus Torvalds * must pass to upper level 7681da177e4SLinus Torvalds */ 7691da177e4SLinus Torvalds 7701da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7713ff50b79SStephen Hemminger } 7723ff50b79SStephen Hemminger 7731da177e4SLinus Torvalds kfree_skb(skb); 7741da177e4SLinus Torvalds return 0; 7751da177e4SLinus Torvalds 7761da177e4SLinus Torvalds discard_it: 777e41b5368SDenis V. Lunev ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INERRORS); 7788b7817f3SHerbert Xu drop_no_count: 7791da177e4SLinus Torvalds kfree_skb(skb); 7801da177e4SLinus Torvalds return 0; 7811da177e4SLinus Torvalds } 7821da177e4SLinus Torvalds 7834c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, 78495e41e93SYOSHIFUJI Hideaki u8 type, 78595e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 78695e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 78795e41e93SYOSHIFUJI Hideaki int oif) 78895e41e93SYOSHIFUJI Hideaki { 7894c9483b2SDavid S. Miller memset(fl6, 0, sizeof(*fl6)); 7904e3fd7a0SAlexey Dobriyan fl6->saddr = *saddr; 7914e3fd7a0SAlexey Dobriyan fl6->daddr = *daddr; 7924c9483b2SDavid S. Miller fl6->flowi6_proto = IPPROTO_ICMPV6; 7931958b856SDavid S. Miller fl6->fl6_icmp_type = type; 7941958b856SDavid S. Miller fl6->fl6_icmp_code = 0; 7954c9483b2SDavid S. Miller fl6->flowi6_oif = oif; 7964c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); 79795e41e93SYOSHIFUJI Hideaki } 79895e41e93SYOSHIFUJI Hideaki 799640c41c7SIngo Molnar /* 800b7e729c4SDenis V. Lunev * Special lock-class for __icmpv6_sk: 801640c41c7SIngo Molnar */ 802640c41c7SIngo Molnar static struct lock_class_key icmpv6_socket_sk_dst_lock_key; 803640c41c7SIngo Molnar 80498c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 8051da177e4SLinus Torvalds { 8061da177e4SLinus Torvalds struct sock *sk; 8071da177e4SLinus Torvalds int err, i, j; 8081da177e4SLinus Torvalds 80998c6d1b2SDenis V. Lunev net->ipv6.icmp_sk = 81098c6d1b2SDenis V. Lunev kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); 81198c6d1b2SDenis V. Lunev if (net->ipv6.icmp_sk == NULL) 81279c91159SDenis V. Lunev return -ENOMEM; 81379c91159SDenis V. Lunev 8146f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8151ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 8161ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 8171da177e4SLinus Torvalds if (err < 0) { 818f3213831SJoe Perches pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", 8191da177e4SLinus Torvalds err); 8201da177e4SLinus Torvalds goto fail; 8211da177e4SLinus Torvalds } 8221da177e4SLinus Torvalds 8231ed8516fSDenis V. Lunev net->ipv6.icmp_sk[i] = sk; 8245c8cafd6SDenis V. Lunev 825640c41c7SIngo Molnar /* 826640c41c7SIngo Molnar * Split off their lock-class, because sk->sk_dst_lock 827640c41c7SIngo Molnar * gets used from softirqs, which is safe for 828b7e729c4SDenis V. Lunev * __icmpv6_sk (because those never get directly used 829640c41c7SIngo Molnar * via userspace syscalls), but unsafe for normal sockets. 830640c41c7SIngo Molnar */ 831640c41c7SIngo Molnar lockdep_set_class(&sk->sk_dst_lock, 832640c41c7SIngo Molnar &icmpv6_socket_sk_dst_lock_key); 8331da177e4SLinus Torvalds 8341da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 8351da177e4SLinus Torvalds * sk_buff struct overhead. 8361da177e4SLinus Torvalds */ 83787fb4b7bSEric Dumazet sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); 8381da177e4SLinus Torvalds } 8391da177e4SLinus Torvalds return 0; 8401da177e4SLinus Torvalds 8411da177e4SLinus Torvalds fail: 8425c8cafd6SDenis V. Lunev for (j = 0; j < i; j++) 8431ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); 84498c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 8451da177e4SLinus Torvalds return err; 8461da177e4SLinus Torvalds } 8471da177e4SLinus Torvalds 84898c6d1b2SDenis V. Lunev static void __net_exit icmpv6_sk_exit(struct net *net) 8491da177e4SLinus Torvalds { 8501da177e4SLinus Torvalds int i; 8511da177e4SLinus Torvalds 8526f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8531ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); 8541da177e4SLinus Torvalds } 85598c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 85698c6d1b2SDenis V. Lunev } 85798c6d1b2SDenis V. Lunev 8588ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 85998c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 86098c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 86198c6d1b2SDenis V. Lunev }; 86298c6d1b2SDenis V. Lunev 86398c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 86498c6d1b2SDenis V. Lunev { 86598c6d1b2SDenis V. Lunev int err; 86698c6d1b2SDenis V. Lunev 86798c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 86898c6d1b2SDenis V. Lunev if (err < 0) 86998c6d1b2SDenis V. Lunev return err; 87098c6d1b2SDenis V. Lunev 87198c6d1b2SDenis V. Lunev err = -EAGAIN; 87298c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 87398c6d1b2SDenis V. Lunev goto fail; 87498c6d1b2SDenis V. Lunev return 0; 87598c6d1b2SDenis V. Lunev 87698c6d1b2SDenis V. Lunev fail: 877f3213831SJoe Perches pr_err("Failed to register ICMP6 protocol\n"); 87898c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 87998c6d1b2SDenis V. Lunev return err; 88098c6d1b2SDenis V. Lunev } 88198c6d1b2SDenis V. Lunev 8828ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 88398c6d1b2SDenis V. Lunev { 88498c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 8851da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 8861da177e4SLinus Torvalds } 8871da177e4SLinus Torvalds 88898c6d1b2SDenis V. Lunev 8899b5b5cffSArjan van de Ven static const struct icmp6_err { 8901da177e4SLinus Torvalds int err; 8911da177e4SLinus Torvalds int fatal; 8921da177e4SLinus Torvalds } tab_unreach[] = { 8931da177e4SLinus Torvalds { /* NOROUTE */ 8941da177e4SLinus Torvalds .err = ENETUNREACH, 8951da177e4SLinus Torvalds .fatal = 0, 8961da177e4SLinus Torvalds }, 8971da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 8981da177e4SLinus Torvalds .err = EACCES, 8991da177e4SLinus Torvalds .fatal = 1, 9001da177e4SLinus Torvalds }, 9011da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 9021da177e4SLinus Torvalds .err = EHOSTUNREACH, 9031da177e4SLinus Torvalds .fatal = 0, 9041da177e4SLinus Torvalds }, 9051da177e4SLinus Torvalds { /* ADDR_UNREACH */ 9061da177e4SLinus Torvalds .err = EHOSTUNREACH, 9071da177e4SLinus Torvalds .fatal = 0, 9081da177e4SLinus Torvalds }, 9091da177e4SLinus Torvalds { /* PORT_UNREACH */ 9101da177e4SLinus Torvalds .err = ECONNREFUSED, 9111da177e4SLinus Torvalds .fatal = 1, 9121da177e4SLinus Torvalds }, 9131da177e4SLinus Torvalds }; 9141da177e4SLinus Torvalds 915d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 9161da177e4SLinus Torvalds { 9171da177e4SLinus Torvalds int fatal = 0; 9181da177e4SLinus Torvalds 9191da177e4SLinus Torvalds *err = EPROTO; 9201da177e4SLinus Torvalds 9211da177e4SLinus Torvalds switch (type) { 9221da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 9231da177e4SLinus Torvalds fatal = 1; 9241da177e4SLinus Torvalds if (code <= ICMPV6_PORT_UNREACH) { 9251da177e4SLinus Torvalds *err = tab_unreach[code].err; 9261da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 9271da177e4SLinus Torvalds } 9281da177e4SLinus Torvalds break; 9291da177e4SLinus Torvalds 9301da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 9311da177e4SLinus Torvalds *err = EMSGSIZE; 9321da177e4SLinus Torvalds break; 9331da177e4SLinus Torvalds 9341da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 9351da177e4SLinus Torvalds *err = EPROTO; 9361da177e4SLinus Torvalds fatal = 1; 9371da177e4SLinus Torvalds break; 9381da177e4SLinus Torvalds 9391da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 9401da177e4SLinus Torvalds *err = EHOSTUNREACH; 9411da177e4SLinus Torvalds break; 9423ff50b79SStephen Hemminger } 9431da177e4SLinus Torvalds 9441da177e4SLinus Torvalds return fatal; 9451da177e4SLinus Torvalds } 9467159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 9477159039aSYOSHIFUJI Hideaki 9481da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 949760f2d01SDaniel Lezcano ctl_table ipv6_icmp_table_template[] = { 9501da177e4SLinus Torvalds { 9511da177e4SLinus Torvalds .procname = "ratelimit", 95241a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 9531da177e4SLinus Torvalds .maxlen = sizeof(int), 9541da177e4SLinus Torvalds .mode = 0644, 9556d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 9561da177e4SLinus Torvalds }, 957f8572d8fSEric W. Biederman { }, 9581da177e4SLinus Torvalds }; 959760f2d01SDaniel Lezcano 9602c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 961760f2d01SDaniel Lezcano { 962760f2d01SDaniel Lezcano struct ctl_table *table; 963760f2d01SDaniel Lezcano 964760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 965760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 966760f2d01SDaniel Lezcano GFP_KERNEL); 9675ee09105SYOSHIFUJI Hideaki 9685ee09105SYOSHIFUJI Hideaki if (table) 9695ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 9705ee09105SYOSHIFUJI Hideaki 971760f2d01SDaniel Lezcano return table; 972760f2d01SDaniel Lezcano } 9731da177e4SLinus Torvalds #endif 9741da177e4SLinus Torvalds 975