11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * Internet Control Message Protocol (ICMPv6) 31da177e4SLinus Torvalds * Linux INET6 implementation 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Authors: 61da177e4SLinus Torvalds * Pedro Roque <roque@di.fc.ul.pt> 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * Based on net/ipv4/icmp.c 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * RFC 1885 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 131da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 141da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 151da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 161da177e4SLinus Torvalds */ 171da177e4SLinus Torvalds 181da177e4SLinus Torvalds /* 191da177e4SLinus Torvalds * Changes: 201da177e4SLinus Torvalds * 211da177e4SLinus Torvalds * Andi Kleen : exception handling 221da177e4SLinus Torvalds * Andi Kleen add rate limits. never reply to a icmp. 231da177e4SLinus Torvalds * add more length checks and other fixes. 241da177e4SLinus Torvalds * yoshfuji : ensure to sent parameter problem for 251da177e4SLinus Torvalds * fragments. 261da177e4SLinus Torvalds * YOSHIFUJI Hideaki @USAGI: added sysctl for icmp rate limit. 271da177e4SLinus Torvalds * Randy Dunlap and 281da177e4SLinus Torvalds * YOSHIFUJI Hideaki @USAGI: Per-interface statistics support 291da177e4SLinus Torvalds * Kazunori MIYAZAWA @USAGI: change output process to use ip6_append_data 301da177e4SLinus Torvalds */ 311da177e4SLinus Torvalds 32f3213831SJoe Perches #define pr_fmt(fmt) "IPv6: " fmt 33f3213831SJoe Perches 341da177e4SLinus Torvalds #include <linux/module.h> 351da177e4SLinus Torvalds #include <linux/errno.h> 361da177e4SLinus Torvalds #include <linux/types.h> 371da177e4SLinus Torvalds #include <linux/socket.h> 381da177e4SLinus Torvalds #include <linux/in.h> 391da177e4SLinus Torvalds #include <linux/kernel.h> 401da177e4SLinus Torvalds #include <linux/sockios.h> 411da177e4SLinus Torvalds #include <linux/net.h> 421da177e4SLinus Torvalds #include <linux/skbuff.h> 431da177e4SLinus Torvalds #include <linux/init.h> 44763ecff1SYasuyuki Kozakai #include <linux/netfilter.h> 455a0e3ad6STejun Heo #include <linux/slab.h> 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 481da177e4SLinus Torvalds #include <linux/sysctl.h> 491da177e4SLinus Torvalds #endif 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds #include <linux/inet.h> 521da177e4SLinus Torvalds #include <linux/netdevice.h> 531da177e4SLinus Torvalds #include <linux/icmpv6.h> 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds #include <net/ip.h> 561da177e4SLinus Torvalds #include <net/sock.h> 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds #include <net/ipv6.h> 591da177e4SLinus Torvalds #include <net/ip6_checksum.h> 606d0bfe22SLorenzo Colitti #include <net/ping.h> 611da177e4SLinus Torvalds #include <net/protocol.h> 621da177e4SLinus Torvalds #include <net/raw.h> 631da177e4SLinus Torvalds #include <net/rawv6.h> 641da177e4SLinus Torvalds #include <net/transp_v6.h> 651da177e4SLinus Torvalds #include <net/ip6_route.h> 661da177e4SLinus Torvalds #include <net/addrconf.h> 671da177e4SLinus Torvalds #include <net/icmp.h> 688b7817f3SHerbert Xu #include <net/xfrm.h> 691ed8516fSDenis V. Lunev #include <net/inet_common.h> 70825edac4SHannes Frederic Sowa #include <net/dsfield.h> 71ca254490SDavid Ahern #include <net/l3mdev.h> 721da177e4SLinus Torvalds 737c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds /* 761da177e4SLinus Torvalds * The ICMP socket(s). This is the most convenient way to flow control 771da177e4SLinus Torvalds * our ICMP output as well as maintain a clean interface throughout 781da177e4SLinus Torvalds * all layers. All Socketless IP sends will soon be gone. 791da177e4SLinus Torvalds * 801da177e4SLinus Torvalds * On SMP we have one ICMP socket per-cpu. 811da177e4SLinus Torvalds */ 8298c6d1b2SDenis V. Lunev static inline struct sock *icmpv6_sk(struct net *net) 8398c6d1b2SDenis V. Lunev { 8498c6d1b2SDenis V. Lunev return net->ipv6.icmp_sk[smp_processor_id()]; 8598c6d1b2SDenis V. Lunev } 861da177e4SLinus Torvalds 876f809da2SSteffen Klassert static void icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 886f809da2SSteffen Klassert u8 type, u8 code, int offset, __be32 info) 896f809da2SSteffen Klassert { 906d0bfe22SLorenzo Colitti /* icmpv6_notify checks 8 bytes can be pulled, icmp6hdr is 8 bytes */ 916d0bfe22SLorenzo Colitti struct icmp6hdr *icmp6 = (struct icmp6hdr *) (skb->data + offset); 926f809da2SSteffen Klassert struct net *net = dev_net(skb->dev); 936f809da2SSteffen Klassert 946f809da2SSteffen Klassert if (type == ICMPV6_PKT_TOOBIG) 95e2d118a1SLorenzo Colitti ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); 966f809da2SSteffen Klassert else if (type == NDISC_REDIRECT) 97e2d118a1SLorenzo Colitti ip6_redirect(skb, net, skb->dev->ifindex, 0, 98e2d118a1SLorenzo Colitti sock_net_uid(net, NULL)); 996d0bfe22SLorenzo Colitti 1006d0bfe22SLorenzo Colitti if (!(type & ICMPV6_INFOMSG_MASK)) 1016d0bfe22SLorenzo Colitti if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST) 102dcb94b88SHannes Frederic Sowa ping_err(skb, offset, ntohl(info)); 1036f809da2SSteffen Klassert } 1046f809da2SSteffen Klassert 105e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb); 1061da177e4SLinus Torvalds 10741135cc8SAlexey Dobriyan static const struct inet6_protocol icmpv6_protocol = { 1081da177e4SLinus Torvalds .handler = icmpv6_rcv, 1096f809da2SSteffen Klassert .err_handler = icmpv6_err, 1108b7817f3SHerbert Xu .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1111da177e4SLinus Torvalds }; 1121da177e4SLinus Torvalds 1137ba91ecbSJesper Dangaard Brouer /* Called with BH disabled */ 114fdc0bde9SDenis V. Lunev static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) 1151da177e4SLinus Torvalds { 116fdc0bde9SDenis V. Lunev struct sock *sk; 117fdc0bde9SDenis V. Lunev 118fdc0bde9SDenis V. Lunev sk = icmpv6_sk(net); 119405666dbSDenis V. Lunev if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { 1201da177e4SLinus Torvalds /* This can happen if the output path (f.e. SIT or 1211da177e4SLinus Torvalds * ip6ip6 tunnel) signals dst_link_failure() for an 1221da177e4SLinus Torvalds * outgoing ICMP6 packet. 1231da177e4SLinus Torvalds */ 124fdc0bde9SDenis V. Lunev return NULL; 1251da177e4SLinus Torvalds } 126fdc0bde9SDenis V. Lunev return sk; 1271da177e4SLinus Torvalds } 1281da177e4SLinus Torvalds 129405666dbSDenis V. Lunev static __inline__ void icmpv6_xmit_unlock(struct sock *sk) 1301da177e4SLinus Torvalds { 1317ba91ecbSJesper Dangaard Brouer spin_unlock(&sk->sk_lock.slock); 1321da177e4SLinus Torvalds } 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds /* 1351da177e4SLinus Torvalds * Figure out, may we reply to this packet with icmp error. 1361da177e4SLinus Torvalds * 1371da177e4SLinus Torvalds * We do not reply, if: 1381da177e4SLinus Torvalds * - it was icmp error message. 1391da177e4SLinus Torvalds * - it is truncated, so that it is known, that protocol is ICMPV6 1401da177e4SLinus Torvalds * (i.e. in the middle of some exthdr) 1411da177e4SLinus Torvalds * 1421da177e4SLinus Torvalds * --ANK (980726) 1431da177e4SLinus Torvalds */ 1441da177e4SLinus Torvalds 145a50feda5SEric Dumazet static bool is_ineligible(const struct sk_buff *skb) 1461da177e4SLinus Torvalds { 1470660e03fSArnaldo Carvalho de Melo int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; 1481da177e4SLinus Torvalds int len = skb->len - ptr; 1490660e03fSArnaldo Carvalho de Melo __u8 nexthdr = ipv6_hdr(skb)->nexthdr; 15075f2811cSJesse Gross __be16 frag_off; 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds if (len < 0) 153a50feda5SEric Dumazet return true; 1541da177e4SLinus Torvalds 15575f2811cSJesse Gross ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off); 1561da177e4SLinus Torvalds if (ptr < 0) 157a50feda5SEric Dumazet return false; 1581da177e4SLinus Torvalds if (nexthdr == IPPROTO_ICMPV6) { 1591da177e4SLinus Torvalds u8 _type, *tp; 1601da177e4SLinus Torvalds tp = skb_header_pointer(skb, 1611da177e4SLinus Torvalds ptr+offsetof(struct icmp6hdr, icmp6_type), 1621da177e4SLinus Torvalds sizeof(_type), &_type); 16363159f29SIan Morris if (!tp || !(*tp & ICMPV6_INFOMSG_MASK)) 164a50feda5SEric Dumazet return true; 1651da177e4SLinus Torvalds } 166a50feda5SEric Dumazet return false; 1671da177e4SLinus Torvalds } 1681da177e4SLinus Torvalds 169c0303efeSJesper Dangaard Brouer static bool icmpv6_mask_allow(int type) 170c0303efeSJesper Dangaard Brouer { 171c0303efeSJesper Dangaard Brouer /* Informational messages are not limited. */ 172c0303efeSJesper Dangaard Brouer if (type & ICMPV6_INFOMSG_MASK) 173c0303efeSJesper Dangaard Brouer return true; 174c0303efeSJesper Dangaard Brouer 175c0303efeSJesper Dangaard Brouer /* Do not limit pmtu discovery, it would break it. */ 176c0303efeSJesper Dangaard Brouer if (type == ICMPV6_PKT_TOOBIG) 177c0303efeSJesper Dangaard Brouer return true; 178c0303efeSJesper Dangaard Brouer 179c0303efeSJesper Dangaard Brouer return false; 180c0303efeSJesper Dangaard Brouer } 181c0303efeSJesper Dangaard Brouer 182c0303efeSJesper Dangaard Brouer static bool icmpv6_global_allow(int type) 183c0303efeSJesper Dangaard Brouer { 184c0303efeSJesper Dangaard Brouer if (icmpv6_mask_allow(type)) 185c0303efeSJesper Dangaard Brouer return true; 186c0303efeSJesper Dangaard Brouer 187c0303efeSJesper Dangaard Brouer if (icmp_global_allow()) 188c0303efeSJesper Dangaard Brouer return true; 189c0303efeSJesper Dangaard Brouer 190c0303efeSJesper Dangaard Brouer return false; 191c0303efeSJesper Dangaard Brouer } 192c0303efeSJesper Dangaard Brouer 1931da177e4SLinus Torvalds /* 1941da177e4SLinus Torvalds * Check the ICMP output rate limit 1951da177e4SLinus Torvalds */ 1964cdf507dSEric Dumazet static bool icmpv6_xrlim_allow(struct sock *sk, u8 type, 1974c9483b2SDavid S. Miller struct flowi6 *fl6) 1981da177e4SLinus Torvalds { 1993b1e0a65SYOSHIFUJI Hideaki struct net *net = sock_net(sk); 2004cdf507dSEric Dumazet struct dst_entry *dst; 20192d86829SDavid S. Miller bool res = false; 2021da177e4SLinus Torvalds 203c0303efeSJesper Dangaard Brouer if (icmpv6_mask_allow(type)) 20492d86829SDavid S. Miller return true; 2051da177e4SLinus Torvalds 2061da177e4SLinus Torvalds /* 2071da177e4SLinus Torvalds * Look up the output route. 2081da177e4SLinus Torvalds * XXX: perhaps the expire for routing entries cloned by 2091da177e4SLinus Torvalds * this lookup should be more aggressive (not longer than timeout). 2101da177e4SLinus Torvalds */ 2114c9483b2SDavid S. Miller dst = ip6_route_output(net, sk, fl6); 2121da177e4SLinus Torvalds if (dst->error) { 2133bd653c8SDenis V. Lunev IP6_INC_STATS(net, ip6_dst_idev(dst), 214a11d206dSYOSHIFUJI Hideaki IPSTATS_MIB_OUTNOROUTES); 2151da177e4SLinus Torvalds } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { 21692d86829SDavid S. Miller res = true; 2171da177e4SLinus Torvalds } else { 2181da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 2199a43b709SBenjamin Thery int tmo = net->ipv6.sysctl.icmpv6_time; 220c0303efeSJesper Dangaard Brouer struct inet_peer *peer; 2211da177e4SLinus Torvalds 2221da177e4SLinus Torvalds /* Give more bandwidth to wider prefixes. */ 2231da177e4SLinus Torvalds if (rt->rt6i_dst.plen < 128) 2241da177e4SLinus Torvalds tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 2251da177e4SLinus Torvalds 226c0303efeSJesper Dangaard Brouer peer = inet_getpeer_v6(net->ipv6.peers, &fl6->daddr, 1); 227fbfe95a4SDavid S. Miller res = inet_peer_xrlim_allow(peer, tmo); 2281d861aa4SDavid S. Miller if (peer) 2291d861aa4SDavid S. Miller inet_putpeer(peer); 2301da177e4SLinus Torvalds } 2311da177e4SLinus Torvalds dst_release(dst); 2321da177e4SLinus Torvalds return res; 2331da177e4SLinus Torvalds } 2341da177e4SLinus Torvalds 2351da177e4SLinus Torvalds /* 2361da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2371da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2381da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2391da177e4SLinus Torvalds * highest-order two bits set to 10 2401da177e4SLinus Torvalds */ 2411da177e4SLinus Torvalds 242a50feda5SEric Dumazet static bool opt_unrec(struct sk_buff *skb, __u32 offset) 2431da177e4SLinus Torvalds { 2441da177e4SLinus Torvalds u8 _optval, *op; 2451da177e4SLinus Torvalds 246bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2471da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 24863159f29SIan Morris if (!op) 249a50feda5SEric Dumazet return true; 2501da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2511da177e4SLinus Torvalds } 2521da177e4SLinus Torvalds 2534e64b1edSJoe Perches void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 2546d0bfe22SLorenzo Colitti struct icmp6hdr *thdr, int len) 2551da177e4SLinus Torvalds { 2561da177e4SLinus Torvalds struct sk_buff *skb; 2571da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2581da177e4SLinus Torvalds 259e5d08d71SIan Morris skb = skb_peek(&sk->sk_write_queue); 26063159f29SIan Morris if (!skb) 2614e64b1edSJoe Perches return; 2621da177e4SLinus Torvalds 263cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2641da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2651da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2661da177e4SLinus Torvalds 2671da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 26807f0757aSJoe Perches skb->csum = csum_partial(icmp6h, 2691da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2704c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2714c9483b2SDavid S. Miller &fl6->daddr, 2724c9483b2SDavid S. Miller len, fl6->flowi6_proto, 2731da177e4SLinus Torvalds skb->csum); 2741da177e4SLinus Torvalds } else { 275868c86bcSAl Viro __wsum tmp_csum = 0; 2761da177e4SLinus Torvalds 2771da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2781da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2791da177e4SLinus Torvalds } 2801da177e4SLinus Torvalds 28107f0757aSJoe Perches tmp_csum = csum_partial(icmp6h, 2821da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 2834c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2844c9483b2SDavid S. Miller &fl6->daddr, 2854c9483b2SDavid S. Miller len, fl6->flowi6_proto, 286868c86bcSAl Viro tmp_csum); 2871da177e4SLinus Torvalds } 2881da177e4SLinus Torvalds ip6_push_pending_frames(sk); 2891da177e4SLinus Torvalds } 2901da177e4SLinus Torvalds 2911da177e4SLinus Torvalds struct icmpv6_msg { 2921da177e4SLinus Torvalds struct sk_buff *skb; 2931da177e4SLinus Torvalds int offset; 294763ecff1SYasuyuki Kozakai uint8_t type; 2951da177e4SLinus Torvalds }; 2961da177e4SLinus Torvalds 2971da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 2981da177e4SLinus Torvalds { 2991da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 3001da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 3015f92a738SAl Viro __wsum csum = 0; 3021da177e4SLinus Torvalds 3031da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 3041da177e4SLinus Torvalds to, len, csum); 3051da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 306763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 307763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 3081da177e4SLinus Torvalds return 0; 3091da177e4SLinus Torvalds } 3101da177e4SLinus Torvalds 31107a93626SAmerigo Wang #if IS_ENABLED(CONFIG_IPV6_MIP6) 31279383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 31379383236SMasahide NAKAMURA { 3140660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 31579383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 31679383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 31779383236SMasahide NAKAMURA struct in6_addr tmp; 31879383236SMasahide NAKAMURA int off; 31979383236SMasahide NAKAMURA 32079383236SMasahide NAKAMURA if (opt->dsthao) { 32179383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 32279383236SMasahide NAKAMURA if (likely(off >= 0)) { 323d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 324d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 3254e3fd7a0SAlexey Dobriyan tmp = iph->saddr; 3264e3fd7a0SAlexey Dobriyan iph->saddr = hao->addr; 3274e3fd7a0SAlexey Dobriyan hao->addr = tmp; 32879383236SMasahide NAKAMURA } 32979383236SMasahide NAKAMURA } 33079383236SMasahide NAKAMURA } 33179383236SMasahide NAKAMURA #else 33279383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 33379383236SMasahide NAKAMURA #endif 33479383236SMasahide NAKAMURA 335e8243534Sstephen hemminger static struct dst_entry *icmpv6_route_lookup(struct net *net, 336e8243534Sstephen hemminger struct sk_buff *skb, 337e8243534Sstephen hemminger struct sock *sk, 338e8243534Sstephen hemminger struct flowi6 *fl6) 339b42835dbSDavid S. Miller { 340b42835dbSDavid S. Miller struct dst_entry *dst, *dst2; 3414c9483b2SDavid S. Miller struct flowi6 fl2; 342b42835dbSDavid S. Miller int err; 343b42835dbSDavid S. Miller 344343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst, fl6); 345b42835dbSDavid S. Miller if (err) 346b42835dbSDavid S. Miller return ERR_PTR(err); 347b42835dbSDavid S. Miller 348b42835dbSDavid S. Miller /* 349b42835dbSDavid S. Miller * We won't send icmp if the destination is known 350b42835dbSDavid S. Miller * anycast. 351b42835dbSDavid S. Miller */ 3522647a9b0SMartin KaFai Lau if (ipv6_anycast_destination(dst, &fl6->daddr)) { 353ba7a46f1SJoe Perches net_dbg_ratelimited("icmp6_send: acast source\n"); 354b42835dbSDavid S. Miller dst_release(dst); 355b42835dbSDavid S. Miller return ERR_PTR(-EINVAL); 356b42835dbSDavid S. Miller } 357b42835dbSDavid S. Miller 358b42835dbSDavid S. Miller /* No need to clone since we're just using its address. */ 359b42835dbSDavid S. Miller dst2 = dst; 360b42835dbSDavid S. Miller 3614c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); 362452edd59SDavid S. Miller if (!IS_ERR(dst)) { 363b42835dbSDavid S. Miller if (dst != dst2) 364b42835dbSDavid S. Miller return dst; 365452edd59SDavid S. Miller } else { 366452edd59SDavid S. Miller if (PTR_ERR(dst) == -EPERM) 367b42835dbSDavid S. Miller dst = NULL; 368452edd59SDavid S. Miller else 369452edd59SDavid S. Miller return dst; 370b42835dbSDavid S. Miller } 371b42835dbSDavid S. Miller 3724c9483b2SDavid S. Miller err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); 373b42835dbSDavid S. Miller if (err) 374b42835dbSDavid S. Miller goto relookup_failed; 375b42835dbSDavid S. Miller 376343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst2, &fl2); 377b42835dbSDavid S. Miller if (err) 378b42835dbSDavid S. Miller goto relookup_failed; 379b42835dbSDavid S. Miller 3804c9483b2SDavid S. Miller dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); 381452edd59SDavid S. Miller if (!IS_ERR(dst2)) { 382b42835dbSDavid S. Miller dst_release(dst); 383b42835dbSDavid S. Miller dst = dst2; 384452edd59SDavid S. Miller } else { 385452edd59SDavid S. Miller err = PTR_ERR(dst2); 386452edd59SDavid S. Miller if (err == -EPERM) { 387b42835dbSDavid S. Miller dst_release(dst); 388452edd59SDavid S. Miller return dst2; 389452edd59SDavid S. Miller } else 390b42835dbSDavid S. Miller goto relookup_failed; 391b42835dbSDavid S. Miller } 392b42835dbSDavid S. Miller 393b42835dbSDavid S. Miller relookup_failed: 394b42835dbSDavid S. Miller if (dst) 395b42835dbSDavid S. Miller return dst; 396b42835dbSDavid S. Miller return ERR_PTR(err); 397b42835dbSDavid S. Miller } 398b42835dbSDavid S. Miller 3991b70d792SDavid Ahern static int icmp6_iif(const struct sk_buff *skb) 4001b70d792SDavid Ahern { 4011b70d792SDavid Ahern int iif = skb->dev->ifindex; 4021b70d792SDavid Ahern 4031b70d792SDavid Ahern /* for local traffic to local address, skb dev is the loopback 4041b70d792SDavid Ahern * device. Check if there is a dst attached to the skb and if so 4051b70d792SDavid Ahern * get the real device index. 4061b70d792SDavid Ahern */ 4071b70d792SDavid Ahern if (unlikely(iif == LOOPBACK_IFINDEX)) { 4081b70d792SDavid Ahern const struct rt6_info *rt6 = skb_rt6_info(skb); 4091b70d792SDavid Ahern 4101b70d792SDavid Ahern if (rt6) 4111b70d792SDavid Ahern iif = rt6->rt6i_idev->dev->ifindex; 4121b70d792SDavid Ahern } 4131b70d792SDavid Ahern 4141b70d792SDavid Ahern return iif; 4151b70d792SDavid Ahern } 4161b70d792SDavid Ahern 4171da177e4SLinus Torvalds /* 4181da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 4191da177e4SLinus Torvalds */ 420b1cadc1aSEric Dumazet static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info, 421b1cadc1aSEric Dumazet const struct in6_addr *force_saddr) 4221da177e4SLinus Torvalds { 423c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 4241da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 4250660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 42684427d53SYOSHIFUJI Hideaki struct sock *sk; 42784427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 428b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 4291da177e4SLinus Torvalds struct dst_entry *dst; 4301da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 4314c9483b2SDavid S. Miller struct flowi6 fl6; 4321da177e4SLinus Torvalds struct icmpv6_msg msg; 43326879da5SWei Wang struct ipcm6_cookie ipc6; 4341da177e4SLinus Torvalds int iif = 0; 4351da177e4SLinus Torvalds int addr_type = 0; 4361da177e4SLinus Torvalds int len; 437e110861fSLorenzo Colitti u32 mark = IP6_REPLY_MARK(net, skb->mark); 4381da177e4SLinus Torvalds 43927a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 44029a3cad5SSimon Horman (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb)) 4411da177e4SLinus Torvalds return; 4421da177e4SLinus Torvalds 4431da177e4SLinus Torvalds /* 4441da177e4SLinus Torvalds * Make sure we respect the rules 4451da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 4465f5624cfSPravin B Shelar * Rule (e.1) is enforced by not using icmp6_send 4471da177e4SLinus Torvalds * in any code that processes icmp errors. 4481da177e4SLinus Torvalds */ 4491da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 4501da177e4SLinus Torvalds 451446fab59SFX Le Bail if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) || 452d94c1f92SFX Le Bail ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr)) 4531da177e4SLinus Torvalds saddr = &hdr->daddr; 4541da177e4SLinus Torvalds 4551da177e4SLinus Torvalds /* 4561da177e4SLinus Torvalds * Dest addr check 4571da177e4SLinus Torvalds */ 4581da177e4SLinus Torvalds 4599a6b4b39Szhuyj if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) { 4601da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 4611da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 4621da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 4631da177e4SLinus Torvalds (opt_unrec(skb, info)))) 4641da177e4SLinus Torvalds return; 4651da177e4SLinus Torvalds 4661da177e4SLinus Torvalds saddr = NULL; 4671da177e4SLinus Torvalds } 4681da177e4SLinus Torvalds 4691da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 4701da177e4SLinus Torvalds 4711da177e4SLinus Torvalds /* 4721da177e4SLinus Torvalds * Source addr check 4731da177e4SLinus Torvalds */ 4741da177e4SLinus Torvalds 4754832c30dSDavid Ahern if (__ipv6_addr_needs_scope_id(addr_type)) { 4761b70d792SDavid Ahern iif = icmp6_iif(skb); 4774832c30dSDavid Ahern } else { 47879dc7e3fSDavid Ahern dst = skb_dst(skb); 47979dc7e3fSDavid Ahern iif = l3mdev_master_ifindex(dst ? dst->dev : skb->dev); 48079dc7e3fSDavid Ahern } 4811da177e4SLinus Torvalds 4821da177e4SLinus Torvalds /* 4838de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 4848de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 4858de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 4868de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 4871da177e4SLinus Torvalds */ 4881da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 4894b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n", 4904b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 4911da177e4SLinus Torvalds return; 4921da177e4SLinus Torvalds } 4931da177e4SLinus Torvalds 4941da177e4SLinus Torvalds /* 4951da177e4SLinus Torvalds * Never answer to a ICMP packet. 4961da177e4SLinus Torvalds */ 4971da177e4SLinus Torvalds if (is_ineligible(skb)) { 4984b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n", 4994b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5001da177e4SLinus Torvalds return; 5011da177e4SLinus Torvalds } 5021da177e4SLinus Torvalds 5037ba91ecbSJesper Dangaard Brouer /* Needed by both icmp_global_allow and icmpv6_xmit_lock */ 5047ba91ecbSJesper Dangaard Brouer local_bh_disable(); 5057ba91ecbSJesper Dangaard Brouer 5067ba91ecbSJesper Dangaard Brouer /* Check global sysctl_icmp_msgs_per_sec ratelimit */ 507849a44deSJesper Dangaard Brouer if (!(skb->dev->flags&IFF_LOOPBACK) && !icmpv6_global_allow(type)) 5087ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 5097ba91ecbSJesper Dangaard Brouer 51079383236SMasahide NAKAMURA mip6_addr_swap(skb); 51179383236SMasahide NAKAMURA 5124c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 5134c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 5144e3fd7a0SAlexey Dobriyan fl6.daddr = hdr->saddr; 515b1cadc1aSEric Dumazet if (force_saddr) 516b1cadc1aSEric Dumazet saddr = force_saddr; 5171da177e4SLinus Torvalds if (saddr) 5184e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 519e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 5204c9483b2SDavid S. Miller fl6.flowi6_oif = iif; 5211958b856SDavid S. Miller fl6.fl6_icmp_type = type; 5221958b856SDavid S. Miller fl6.fl6_icmp_code = code; 523e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 524b4bac172SDavid Ahern fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, NULL); 5254c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 5261da177e4SLinus Torvalds 527fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 52863159f29SIan Morris if (!sk) 5297ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 530c0303efeSJesper Dangaard Brouer 531e110861fSLorenzo Colitti sk->sk_mark = mark; 532fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 533405666dbSDenis V. Lunev 5344c9483b2SDavid S. Miller if (!icmpv6_xrlim_allow(sk, type, &fl6)) 5351da177e4SLinus Torvalds goto out; 5361da177e4SLinus Torvalds 5371da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 5381da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 5391da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 5401da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 5411da177e4SLinus Torvalds 5424c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 5434c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 544c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 545c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 5461da177e4SLinus Torvalds 547b515430aSWillem de Bruijn ipcm6_init_sk(&ipc6, np); 54838b7097bSHannes Frederic Sowa fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 54938b7097bSHannes Frederic Sowa 5504c9483b2SDavid S. Miller dst = icmpv6_route_lookup(net, skb, sk, &fl6); 551b42835dbSDavid S. Miller if (IS_ERR(dst)) 5521da177e4SLinus Torvalds goto out; 5538de3351eSYOSHIFUJI Hideaki 55426879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 5551da177e4SLinus Torvalds 5561da177e4SLinus Torvalds msg.skb = skb; 557bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 558763ecff1SYasuyuki Kozakai msg.type = type; 5591da177e4SLinus Torvalds 5601da177e4SLinus Torvalds len = skb->len - msg.offset; 5611da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); 5621da177e4SLinus Torvalds if (len < 0) { 5634b3418fbSBjørn Mork net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n", 5644b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5651da177e4SLinus Torvalds goto out_dst_release; 5661da177e4SLinus Torvalds } 5671da177e4SLinus Torvalds 568cfdf7647SEric Dumazet rcu_read_lock(); 569cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 5701da177e4SLinus Torvalds 5714e64b1edSJoe Perches if (ip6_append_data(sk, icmpv6_getfrag, &msg, 5721da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 57326879da5SWei Wang sizeof(struct icmp6hdr), 57426879da5SWei Wang &ipc6, &fl6, (struct rt6_info *)dst, 5755fdaa88dSWillem de Bruijn MSG_DONTWAIT)) { 57643a43b60SHannes Frederic Sowa ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 5771da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 578cfdf7647SEric Dumazet } else { 5794e64b1edSJoe Perches icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 580cfdf7647SEric Dumazet len + sizeof(struct icmp6hdr)); 5811da177e4SLinus Torvalds } 582cfdf7647SEric Dumazet rcu_read_unlock(); 5831da177e4SLinus Torvalds out_dst_release: 5841da177e4SLinus Torvalds dst_release(dst); 5851da177e4SLinus Torvalds out: 586405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5877ba91ecbSJesper Dangaard Brouer out_bh_enable: 5887ba91ecbSJesper Dangaard Brouer local_bh_enable(); 5891da177e4SLinus Torvalds } 5905f5624cfSPravin B Shelar 5915f5624cfSPravin B Shelar /* Slightly more convenient version of icmp6_send. 5925f5624cfSPravin B Shelar */ 5935f5624cfSPravin B Shelar void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) 5945f5624cfSPravin B Shelar { 595b1cadc1aSEric Dumazet icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL); 5965f5624cfSPravin B Shelar kfree_skb(skb); 5975f5624cfSPravin B Shelar } 5987159039aSYOSHIFUJI Hideaki 5995fbba8acSEric Dumazet /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH 6005fbba8acSEric Dumazet * if sufficient data bytes are available 6015fbba8acSEric Dumazet * @nhs is the size of the tunnel header(s) : 6025fbba8acSEric Dumazet * Either an IPv4 header for SIT encap 6035fbba8acSEric Dumazet * an IPv4 header + GRE header for GRE encap 6045fbba8acSEric Dumazet */ 60520e1954fSEric Dumazet int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type, 60620e1954fSEric Dumazet unsigned int data_len) 6075fbba8acSEric Dumazet { 6082d7a3b27SEric Dumazet struct in6_addr temp_saddr; 6095fbba8acSEric Dumazet struct rt6_info *rt; 6105fbba8acSEric Dumazet struct sk_buff *skb2; 61120e1954fSEric Dumazet u32 info = 0; 6125fbba8acSEric Dumazet 6135fbba8acSEric Dumazet if (!pskb_may_pull(skb, nhs + sizeof(struct ipv6hdr) + 8)) 6145fbba8acSEric Dumazet return 1; 6155fbba8acSEric Dumazet 61620e1954fSEric Dumazet /* RFC 4884 (partial) support for ICMP extensions */ 61720e1954fSEric Dumazet if (data_len < 128 || (data_len & 7) || skb->len < data_len) 61820e1954fSEric Dumazet data_len = 0; 61920e1954fSEric Dumazet 62020e1954fSEric Dumazet skb2 = data_len ? skb_copy(skb, GFP_ATOMIC) : skb_clone(skb, GFP_ATOMIC); 6215fbba8acSEric Dumazet 6225fbba8acSEric Dumazet if (!skb2) 6235fbba8acSEric Dumazet return 1; 6245fbba8acSEric Dumazet 6255fbba8acSEric Dumazet skb_dst_drop(skb2); 6265fbba8acSEric Dumazet skb_pull(skb2, nhs); 6275fbba8acSEric Dumazet skb_reset_network_header(skb2); 6285fbba8acSEric Dumazet 629b75cc8f9SDavid Ahern rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 630b75cc8f9SDavid Ahern skb, 0); 6315fbba8acSEric Dumazet 6325fbba8acSEric Dumazet if (rt && rt->dst.dev) 6335fbba8acSEric Dumazet skb2->dev = rt->dst.dev; 6345fbba8acSEric Dumazet 6352d7a3b27SEric Dumazet ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr); 63620e1954fSEric Dumazet 63720e1954fSEric Dumazet if (data_len) { 63820e1954fSEric Dumazet /* RFC 4884 (partial) support : 63920e1954fSEric Dumazet * insert 0 padding at the end, before the extensions 64020e1954fSEric Dumazet */ 64120e1954fSEric Dumazet __skb_push(skb2, nhs); 64220e1954fSEric Dumazet skb_reset_network_header(skb2); 64320e1954fSEric Dumazet memmove(skb2->data, skb2->data + nhs, data_len - nhs); 64420e1954fSEric Dumazet memset(skb2->data + data_len - nhs, 0, nhs); 64520e1954fSEric Dumazet /* RFC 4884 4.5 : Length is measured in 64-bit words, 64620e1954fSEric Dumazet * and stored in reserved[0] 64720e1954fSEric Dumazet */ 64820e1954fSEric Dumazet info = (data_len/8) << 24; 64920e1954fSEric Dumazet } 6502d7a3b27SEric Dumazet if (type == ICMP_TIME_EXCEEDED) 6512d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 65220e1954fSEric Dumazet info, &temp_saddr); 6532d7a3b27SEric Dumazet else 6542d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 65520e1954fSEric Dumazet info, &temp_saddr); 6565fbba8acSEric Dumazet if (rt) 6575fbba8acSEric Dumazet ip6_rt_put(rt); 6585fbba8acSEric Dumazet 6595fbba8acSEric Dumazet kfree_skb(skb2); 6605fbba8acSEric Dumazet 6615fbba8acSEric Dumazet return 0; 6625fbba8acSEric Dumazet } 6635fbba8acSEric Dumazet EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach); 6645fbba8acSEric Dumazet 6651da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 6661da177e4SLinus Torvalds { 667c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 66884427d53SYOSHIFUJI Hideaki struct sock *sk; 6691da177e4SLinus Torvalds struct inet6_dev *idev; 67084427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 671b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 672cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 6731da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 6744c9483b2SDavid S. Miller struct flowi6 fl6; 6751da177e4SLinus Torvalds struct icmpv6_msg msg; 6761da177e4SLinus Torvalds struct dst_entry *dst; 67726879da5SWei Wang struct ipcm6_cookie ipc6; 678e110861fSLorenzo Colitti u32 mark = IP6_REPLY_MARK(net, skb->mark); 6791da177e4SLinus Torvalds 6800660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 6811da177e4SLinus Torvalds 682509aba3bSFX Le Bail if (!ipv6_unicast_destination(skb) && 683ec35b61eSFX Le Bail !(net->ipv6.sysctl.anycast_src_echo_reply && 6842647a9b0SMartin KaFai Lau ipv6_anycast_destination(skb_dst(skb), saddr))) 6851da177e4SLinus Torvalds saddr = NULL; 6861da177e4SLinus Torvalds 6871da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 6881da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 6891da177e4SLinus Torvalds 6904c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 6914c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 6924e3fd7a0SAlexey Dobriyan fl6.daddr = ipv6_hdr(skb)->saddr; 6931da177e4SLinus Torvalds if (saddr) 6944e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 6951b70d792SDavid Ahern fl6.flowi6_oif = icmp6_iif(skb); 6961958b856SDavid S. Miller fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; 697e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 698e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 6994c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 7001da177e4SLinus Torvalds 7017ba91ecbSJesper Dangaard Brouer local_bh_disable(); 702fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 70363159f29SIan Morris if (!sk) 7047ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 705e110861fSLorenzo Colitti sk->sk_mark = mark; 706fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 707405666dbSDenis V. Lunev 7084c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 7094c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 710c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 711c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 7121da177e4SLinus Torvalds 7134e64b1edSJoe Perches if (ip6_dst_lookup(net, sk, &dst, &fl6)) 7141da177e4SLinus Torvalds goto out; 7154c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); 716452edd59SDavid S. Miller if (IS_ERR(dst)) 717e104411bSPatrick McHardy goto out; 7181da177e4SLinus Torvalds 719cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 7201da177e4SLinus Torvalds 7211da177e4SLinus Torvalds msg.skb = skb; 7221da177e4SLinus Torvalds msg.offset = 0; 723763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 7241da177e4SLinus Torvalds 725b515430aSWillem de Bruijn ipcm6_init_sk(&ipc6, np); 72626879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 72726879da5SWei Wang ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 72826879da5SWei Wang 7294e64b1edSJoe Perches if (ip6_append_data(sk, icmpv6_getfrag, &msg, 7304e64b1edSJoe Perches skb->len + sizeof(struct icmp6hdr), 73126879da5SWei Wang sizeof(struct icmp6hdr), &ipc6, &fl6, 7325fdaa88dSWillem de Bruijn (struct rt6_info *)dst, MSG_DONTWAIT)) { 733a16292a0SEric Dumazet __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 7341da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 735cfdf7647SEric Dumazet } else { 7364e64b1edSJoe Perches icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 737cfdf7647SEric Dumazet skb->len + sizeof(struct icmp6hdr)); 7381da177e4SLinus Torvalds } 7391da177e4SLinus Torvalds dst_release(dst); 7401da177e4SLinus Torvalds out: 741405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 7427ba91ecbSJesper Dangaard Brouer out_bh_enable: 7437ba91ecbSJesper Dangaard Brouer local_bh_enable(); 7441da177e4SLinus Torvalds } 7451da177e4SLinus Torvalds 746b94f1c09SDavid S. Miller void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 7471da177e4SLinus Torvalds { 74841135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 7491da177e4SLinus Torvalds int inner_offset; 75075f2811cSJesse Gross __be16 frag_off; 751f9242b6bSDavid S. Miller u8 nexthdr; 7527304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 7531da177e4SLinus Torvalds 7541da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 7557304fe46SDuan Jiong goto out; 7561da177e4SLinus Torvalds 7571da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 7581da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 7591da177e4SLinus Torvalds /* now skip over extension headers */ 76075f2811cSJesse Gross inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 76175f2811cSJesse Gross &nexthdr, &frag_off); 7621da177e4SLinus Torvalds if (inner_offset < 0) 7637304fe46SDuan Jiong goto out; 7641da177e4SLinus Torvalds } else { 7651da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 7661da177e4SLinus Torvalds } 7671da177e4SLinus Torvalds 7681da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 7691da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 7707304fe46SDuan Jiong goto out; 7711da177e4SLinus Torvalds 7721da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 7731da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 7741da177e4SLinus Torvalds pmtu discovery. 7751da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 7761da177e4SLinus Torvalds --ANK (980726) 7771da177e4SLinus Torvalds */ 7781da177e4SLinus Torvalds 779f9242b6bSDavid S. Miller ipprot = rcu_dereference(inet6_protos[nexthdr]); 7801da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 7811da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 7821da177e4SLinus Torvalds 78369d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 7847304fe46SDuan Jiong return; 7857304fe46SDuan Jiong 7867304fe46SDuan Jiong out: 787a16292a0SEric Dumazet __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); 7881da177e4SLinus Torvalds } 7891da177e4SLinus Torvalds 7901da177e4SLinus Torvalds /* 7911da177e4SLinus Torvalds * Handle icmp messages 7921da177e4SLinus Torvalds */ 7931da177e4SLinus Torvalds 794e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 7951da177e4SLinus Torvalds { 7961da177e4SLinus Torvalds struct net_device *dev = skb->dev; 7971da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 798b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 7991da177e4SLinus Torvalds struct icmp6hdr *hdr; 800d5fdd6baSBrian Haley u8 type; 801e3e32170SRick Jones bool success = false; 8021da177e4SLinus Torvalds 803aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 804def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 8058b7817f3SHerbert Xu int nh; 8068b7817f3SHerbert Xu 807def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 808aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 809aebcf82cSHerbert Xu goto drop_no_count; 810aebcf82cSHerbert Xu 81181aded24SDavid S. Miller if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) 8128b7817f3SHerbert Xu goto drop_no_count; 8138b7817f3SHerbert Xu 8148b7817f3SHerbert Xu nh = skb_network_offset(skb); 8158b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 8168b7817f3SHerbert Xu 8178b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 8188b7817f3SHerbert Xu goto drop_no_count; 8198b7817f3SHerbert Xu 8208b7817f3SHerbert Xu skb_set_network_header(skb, nh); 8218b7817f3SHerbert Xu } 8228b7817f3SHerbert Xu 823a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS); 8241da177e4SLinus Torvalds 8250660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 8260660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 8271da177e4SLinus Torvalds 82839471ac8STom Herbert if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { 829ba7a46f1SJoe Perches net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", 8300c6ce78aSHarvey Harrison saddr, daddr); 8316a5dc9e5SEric Dumazet goto csum_error; 8321da177e4SLinus Torvalds } 8331da177e4SLinus Torvalds 8348cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 8358cf22943SHerbert Xu goto discard_it; 8361da177e4SLinus Torvalds 837cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 8381da177e4SLinus Torvalds 8391da177e4SLinus Torvalds type = hdr->icmp6_type; 8401da177e4SLinus Torvalds 841f3832ed2SEric Dumazet ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type); 8421da177e4SLinus Torvalds 8431da177e4SLinus Torvalds switch (type) { 8441da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 8451da177e4SLinus Torvalds icmpv6_echo_reply(skb); 8461da177e4SLinus Torvalds break; 8471da177e4SLinus Torvalds 8481da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 849e3e32170SRick Jones success = ping_rcv(skb); 8501da177e4SLinus Torvalds break; 8511da177e4SLinus Torvalds 8521da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 8531da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 8541da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 8551da177e4SLinus Torvalds destination cache will allow to solve this problem 8561da177e4SLinus Torvalds --ANK (980726) 8571da177e4SLinus Torvalds */ 8581da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 8591da177e4SLinus Torvalds goto discard_it; 860cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 8611da177e4SLinus Torvalds 862275757e6SGustavo A. R. Silva /* to notify */ 863275757e6SGustavo A. R. Silva /* fall through */ 8641da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 8651da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 8661da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 8671da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 8681da177e4SLinus Torvalds break; 8691da177e4SLinus Torvalds 8701da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 8711da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 8721da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 8731da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 8741da177e4SLinus Torvalds case NDISC_REDIRECT: 8751da177e4SLinus Torvalds ndisc_rcv(skb); 8761da177e4SLinus Torvalds break; 8771da177e4SLinus Torvalds 8781da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 8791da177e4SLinus Torvalds igmp6_event_query(skb); 8801da177e4SLinus Torvalds break; 8811da177e4SLinus Torvalds 8821da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 8831da177e4SLinus Torvalds igmp6_event_report(skb); 8841da177e4SLinus Torvalds break; 8851da177e4SLinus Torvalds 8861da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 8871da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 8881da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 8891da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 8901da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 8911da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 8921da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 8931da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 8941da177e4SLinus Torvalds break; 8951da177e4SLinus Torvalds 8961da177e4SLinus Torvalds default: 8971da177e4SLinus Torvalds /* informational */ 8981da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 8991da177e4SLinus Torvalds break; 9001da177e4SLinus Torvalds 9014b3418fbSBjørn Mork net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n", 9024b3418fbSBjørn Mork saddr, daddr); 903ea85a0a2SDavid S. Miller 9041da177e4SLinus Torvalds /* 9051da177e4SLinus Torvalds * error of unknown type. 9061da177e4SLinus Torvalds * must pass to upper level 9071da177e4SLinus Torvalds */ 9081da177e4SLinus Torvalds 9091da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 9103ff50b79SStephen Hemminger } 9113ff50b79SStephen Hemminger 912e3e32170SRick Jones /* until the v6 path can be better sorted assume failure and 913e3e32170SRick Jones * preserve the status quo behaviour for the rest of the paths to here 914e3e32170SRick Jones */ 915e3e32170SRick Jones if (success) 916e3e32170SRick Jones consume_skb(skb); 917e3e32170SRick Jones else 9181da177e4SLinus Torvalds kfree_skb(skb); 919e3e32170SRick Jones 9201da177e4SLinus Torvalds return 0; 9211da177e4SLinus Torvalds 9226a5dc9e5SEric Dumazet csum_error: 923a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); 9241da177e4SLinus Torvalds discard_it: 925a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS); 9268b7817f3SHerbert Xu drop_no_count: 9271da177e4SLinus Torvalds kfree_skb(skb); 9281da177e4SLinus Torvalds return 0; 9291da177e4SLinus Torvalds } 9301da177e4SLinus Torvalds 9314c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, 93295e41e93SYOSHIFUJI Hideaki u8 type, 93395e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 93495e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 93595e41e93SYOSHIFUJI Hideaki int oif) 93695e41e93SYOSHIFUJI Hideaki { 9374c9483b2SDavid S. Miller memset(fl6, 0, sizeof(*fl6)); 9384e3fd7a0SAlexey Dobriyan fl6->saddr = *saddr; 9394e3fd7a0SAlexey Dobriyan fl6->daddr = *daddr; 9404c9483b2SDavid S. Miller fl6->flowi6_proto = IPPROTO_ICMPV6; 9411958b856SDavid S. Miller fl6->fl6_icmp_type = type; 9421958b856SDavid S. Miller fl6->fl6_icmp_code = 0; 9434c9483b2SDavid S. Miller fl6->flowi6_oif = oif; 9444c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); 94595e41e93SYOSHIFUJI Hideaki } 94695e41e93SYOSHIFUJI Hideaki 94798c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 9481da177e4SLinus Torvalds { 9491da177e4SLinus Torvalds struct sock *sk; 9501da177e4SLinus Torvalds int err, i, j; 9511da177e4SLinus Torvalds 95298c6d1b2SDenis V. Lunev net->ipv6.icmp_sk = 9536396bb22SKees Cook kcalloc(nr_cpu_ids, sizeof(struct sock *), GFP_KERNEL); 95463159f29SIan Morris if (!net->ipv6.icmp_sk) 95579c91159SDenis V. Lunev return -ENOMEM; 95679c91159SDenis V. Lunev 9576f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 9581ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 9591ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 9601da177e4SLinus Torvalds if (err < 0) { 961f3213831SJoe Perches pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", 9621da177e4SLinus Torvalds err); 9631da177e4SLinus Torvalds goto fail; 9641da177e4SLinus Torvalds } 9651da177e4SLinus Torvalds 9661ed8516fSDenis V. Lunev net->ipv6.icmp_sk[i] = sk; 9675c8cafd6SDenis V. Lunev 9681da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 9691da177e4SLinus Torvalds * sk_buff struct overhead. 9701da177e4SLinus Torvalds */ 97187fb4b7bSEric Dumazet sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); 9721da177e4SLinus Torvalds } 9731da177e4SLinus Torvalds return 0; 9741da177e4SLinus Torvalds 9751da177e4SLinus Torvalds fail: 9765c8cafd6SDenis V. Lunev for (j = 0; j < i; j++) 9771ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); 97898c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 9791da177e4SLinus Torvalds return err; 9801da177e4SLinus Torvalds } 9811da177e4SLinus Torvalds 98298c6d1b2SDenis V. Lunev static void __net_exit icmpv6_sk_exit(struct net *net) 9831da177e4SLinus Torvalds { 9841da177e4SLinus Torvalds int i; 9851da177e4SLinus Torvalds 9866f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 9871ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); 9881da177e4SLinus Torvalds } 98998c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 99098c6d1b2SDenis V. Lunev } 99198c6d1b2SDenis V. Lunev 9928ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 99398c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 99498c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 99598c6d1b2SDenis V. Lunev }; 99698c6d1b2SDenis V. Lunev 99798c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 99898c6d1b2SDenis V. Lunev { 99998c6d1b2SDenis V. Lunev int err; 100098c6d1b2SDenis V. Lunev 100198c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 100298c6d1b2SDenis V. Lunev if (err < 0) 100398c6d1b2SDenis V. Lunev return err; 100498c6d1b2SDenis V. Lunev 100598c6d1b2SDenis V. Lunev err = -EAGAIN; 100698c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 100798c6d1b2SDenis V. Lunev goto fail; 10085f5624cfSPravin B Shelar 10095f5624cfSPravin B Shelar err = inet6_register_icmp_sender(icmp6_send); 10105f5624cfSPravin B Shelar if (err) 10115f5624cfSPravin B Shelar goto sender_reg_err; 101298c6d1b2SDenis V. Lunev return 0; 101398c6d1b2SDenis V. Lunev 10145f5624cfSPravin B Shelar sender_reg_err: 10155f5624cfSPravin B Shelar inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 101698c6d1b2SDenis V. Lunev fail: 1017f3213831SJoe Perches pr_err("Failed to register ICMP6 protocol\n"); 101898c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 101998c6d1b2SDenis V. Lunev return err; 102098c6d1b2SDenis V. Lunev } 102198c6d1b2SDenis V. Lunev 10228ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 102398c6d1b2SDenis V. Lunev { 10245f5624cfSPravin B Shelar inet6_unregister_icmp_sender(icmp6_send); 102598c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 10261da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 10271da177e4SLinus Torvalds } 10281da177e4SLinus Torvalds 102998c6d1b2SDenis V. Lunev 10309b5b5cffSArjan van de Ven static const struct icmp6_err { 10311da177e4SLinus Torvalds int err; 10321da177e4SLinus Torvalds int fatal; 10331da177e4SLinus Torvalds } tab_unreach[] = { 10341da177e4SLinus Torvalds { /* NOROUTE */ 10351da177e4SLinus Torvalds .err = ENETUNREACH, 10361da177e4SLinus Torvalds .fatal = 0, 10371da177e4SLinus Torvalds }, 10381da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 10391da177e4SLinus Torvalds .err = EACCES, 10401da177e4SLinus Torvalds .fatal = 1, 10411da177e4SLinus Torvalds }, 10421da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 10431da177e4SLinus Torvalds .err = EHOSTUNREACH, 10441da177e4SLinus Torvalds .fatal = 0, 10451da177e4SLinus Torvalds }, 10461da177e4SLinus Torvalds { /* ADDR_UNREACH */ 10471da177e4SLinus Torvalds .err = EHOSTUNREACH, 10481da177e4SLinus Torvalds .fatal = 0, 10491da177e4SLinus Torvalds }, 10501da177e4SLinus Torvalds { /* PORT_UNREACH */ 10511da177e4SLinus Torvalds .err = ECONNREFUSED, 10521da177e4SLinus Torvalds .fatal = 1, 10531da177e4SLinus Torvalds }, 105461e76b17SJiri Bohac { /* POLICY_FAIL */ 105561e76b17SJiri Bohac .err = EACCES, 105661e76b17SJiri Bohac .fatal = 1, 105761e76b17SJiri Bohac }, 105861e76b17SJiri Bohac { /* REJECT_ROUTE */ 105961e76b17SJiri Bohac .err = EACCES, 106061e76b17SJiri Bohac .fatal = 1, 106161e76b17SJiri Bohac }, 10621da177e4SLinus Torvalds }; 10631da177e4SLinus Torvalds 1064d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 10651da177e4SLinus Torvalds { 10661da177e4SLinus Torvalds int fatal = 0; 10671da177e4SLinus Torvalds 10681da177e4SLinus Torvalds *err = EPROTO; 10691da177e4SLinus Torvalds 10701da177e4SLinus Torvalds switch (type) { 10711da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 10721da177e4SLinus Torvalds fatal = 1; 107361e76b17SJiri Bohac if (code < ARRAY_SIZE(tab_unreach)) { 10741da177e4SLinus Torvalds *err = tab_unreach[code].err; 10751da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 10761da177e4SLinus Torvalds } 10771da177e4SLinus Torvalds break; 10781da177e4SLinus Torvalds 10791da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 10801da177e4SLinus Torvalds *err = EMSGSIZE; 10811da177e4SLinus Torvalds break; 10821da177e4SLinus Torvalds 10831da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 10841da177e4SLinus Torvalds *err = EPROTO; 10851da177e4SLinus Torvalds fatal = 1; 10861da177e4SLinus Torvalds break; 10871da177e4SLinus Torvalds 10881da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 10891da177e4SLinus Torvalds *err = EHOSTUNREACH; 10901da177e4SLinus Torvalds break; 10913ff50b79SStephen Hemminger } 10921da177e4SLinus Torvalds 10931da177e4SLinus Torvalds return fatal; 10941da177e4SLinus Torvalds } 10957159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 10967159039aSYOSHIFUJI Hideaki 10971da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 1098e8243534Sstephen hemminger static struct ctl_table ipv6_icmp_table_template[] = { 10991da177e4SLinus Torvalds { 11001da177e4SLinus Torvalds .procname = "ratelimit", 110141a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 11021da177e4SLinus Torvalds .maxlen = sizeof(int), 11031da177e4SLinus Torvalds .mode = 0644, 11046d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 11051da177e4SLinus Torvalds }, 1106f8572d8fSEric W. Biederman { }, 11071da177e4SLinus Torvalds }; 1108760f2d01SDaniel Lezcano 11092c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 1110760f2d01SDaniel Lezcano { 1111760f2d01SDaniel Lezcano struct ctl_table *table; 1112760f2d01SDaniel Lezcano 1113760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 1114760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 1115760f2d01SDaniel Lezcano GFP_KERNEL); 11165ee09105SYOSHIFUJI Hideaki 1117c027aab4SEric W. Biederman if (table) 11185ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 11195ee09105SYOSHIFUJI Hideaki 1120760f2d01SDaniel Lezcano return table; 1121760f2d01SDaniel Lezcano } 11221da177e4SLinus Torvalds #endif 1123