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 2536d0bfe22SLorenzo Colitti int 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 int err = 0; 2591da177e4SLinus Torvalds 260e5d08d71SIan Morris skb = skb_peek(&sk->sk_write_queue); 26163159f29SIan Morris if (!skb) 2621da177e4SLinus Torvalds goto out; 2631da177e4SLinus Torvalds 264cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2651da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2661da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2671da177e4SLinus Torvalds 2681da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 26907f0757aSJoe Perches skb->csum = csum_partial(icmp6h, 2701da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2714c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2724c9483b2SDavid S. Miller &fl6->daddr, 2734c9483b2SDavid S. Miller len, fl6->flowi6_proto, 2741da177e4SLinus Torvalds skb->csum); 2751da177e4SLinus Torvalds } else { 276868c86bcSAl Viro __wsum tmp_csum = 0; 2771da177e4SLinus Torvalds 2781da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2791da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2801da177e4SLinus Torvalds } 2811da177e4SLinus Torvalds 28207f0757aSJoe Perches tmp_csum = csum_partial(icmp6h, 2831da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 2844c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2854c9483b2SDavid S. Miller &fl6->daddr, 2864c9483b2SDavid S. Miller len, fl6->flowi6_proto, 287868c86bcSAl Viro tmp_csum); 2881da177e4SLinus Torvalds } 2891da177e4SLinus Torvalds ip6_push_pending_frames(sk); 2901da177e4SLinus Torvalds out: 2911da177e4SLinus Torvalds return err; 2921da177e4SLinus Torvalds } 2931da177e4SLinus Torvalds 2941da177e4SLinus Torvalds struct icmpv6_msg { 2951da177e4SLinus Torvalds struct sk_buff *skb; 2961da177e4SLinus Torvalds int offset; 297763ecff1SYasuyuki Kozakai uint8_t type; 2981da177e4SLinus Torvalds }; 2991da177e4SLinus Torvalds 3001da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 3011da177e4SLinus Torvalds { 3021da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 3031da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 3045f92a738SAl Viro __wsum csum = 0; 3051da177e4SLinus Torvalds 3061da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 3071da177e4SLinus Torvalds to, len, csum); 3081da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 309763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 310763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 3111da177e4SLinus Torvalds return 0; 3121da177e4SLinus Torvalds } 3131da177e4SLinus Torvalds 31407a93626SAmerigo Wang #if IS_ENABLED(CONFIG_IPV6_MIP6) 31579383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 31679383236SMasahide NAKAMURA { 3170660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 31879383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 31979383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 32079383236SMasahide NAKAMURA struct in6_addr tmp; 32179383236SMasahide NAKAMURA int off; 32279383236SMasahide NAKAMURA 32379383236SMasahide NAKAMURA if (opt->dsthao) { 32479383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 32579383236SMasahide NAKAMURA if (likely(off >= 0)) { 326d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 327d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 3284e3fd7a0SAlexey Dobriyan tmp = iph->saddr; 3294e3fd7a0SAlexey Dobriyan iph->saddr = hao->addr; 3304e3fd7a0SAlexey Dobriyan hao->addr = tmp; 33179383236SMasahide NAKAMURA } 33279383236SMasahide NAKAMURA } 33379383236SMasahide NAKAMURA } 33479383236SMasahide NAKAMURA #else 33579383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 33679383236SMasahide NAKAMURA #endif 33779383236SMasahide NAKAMURA 338e8243534Sstephen hemminger static struct dst_entry *icmpv6_route_lookup(struct net *net, 339e8243534Sstephen hemminger struct sk_buff *skb, 340e8243534Sstephen hemminger struct sock *sk, 341e8243534Sstephen hemminger struct flowi6 *fl6) 342b42835dbSDavid S. Miller { 343b42835dbSDavid S. Miller struct dst_entry *dst, *dst2; 3444c9483b2SDavid S. Miller struct flowi6 fl2; 345b42835dbSDavid S. Miller int err; 346b42835dbSDavid S. Miller 347343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst, fl6); 348b42835dbSDavid S. Miller if (err) 349b42835dbSDavid S. Miller return ERR_PTR(err); 350b42835dbSDavid S. Miller 351b42835dbSDavid S. Miller /* 352b42835dbSDavid S. Miller * We won't send icmp if the destination is known 353b42835dbSDavid S. Miller * anycast. 354b42835dbSDavid S. Miller */ 3552647a9b0SMartin KaFai Lau if (ipv6_anycast_destination(dst, &fl6->daddr)) { 356ba7a46f1SJoe Perches net_dbg_ratelimited("icmp6_send: acast source\n"); 357b42835dbSDavid S. Miller dst_release(dst); 358b42835dbSDavid S. Miller return ERR_PTR(-EINVAL); 359b42835dbSDavid S. Miller } 360b42835dbSDavid S. Miller 361b42835dbSDavid S. Miller /* No need to clone since we're just using its address. */ 362b42835dbSDavid S. Miller dst2 = dst; 363b42835dbSDavid S. Miller 3644c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); 365452edd59SDavid S. Miller if (!IS_ERR(dst)) { 366b42835dbSDavid S. Miller if (dst != dst2) 367b42835dbSDavid S. Miller return dst; 368452edd59SDavid S. Miller } else { 369452edd59SDavid S. Miller if (PTR_ERR(dst) == -EPERM) 370b42835dbSDavid S. Miller dst = NULL; 371452edd59SDavid S. Miller else 372452edd59SDavid S. Miller return dst; 373b42835dbSDavid S. Miller } 374b42835dbSDavid S. Miller 3754c9483b2SDavid S. Miller err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); 376b42835dbSDavid S. Miller if (err) 377b42835dbSDavid S. Miller goto relookup_failed; 378b42835dbSDavid S. Miller 379343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst2, &fl2); 380b42835dbSDavid S. Miller if (err) 381b42835dbSDavid S. Miller goto relookup_failed; 382b42835dbSDavid S. Miller 3834c9483b2SDavid S. Miller dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); 384452edd59SDavid S. Miller if (!IS_ERR(dst2)) { 385b42835dbSDavid S. Miller dst_release(dst); 386b42835dbSDavid S. Miller dst = dst2; 387452edd59SDavid S. Miller } else { 388452edd59SDavid S. Miller err = PTR_ERR(dst2); 389452edd59SDavid S. Miller if (err == -EPERM) { 390b42835dbSDavid S. Miller dst_release(dst); 391452edd59SDavid S. Miller return dst2; 392452edd59SDavid S. Miller } else 393b42835dbSDavid S. Miller goto relookup_failed; 394b42835dbSDavid S. Miller } 395b42835dbSDavid S. Miller 396b42835dbSDavid S. Miller relookup_failed: 397b42835dbSDavid S. Miller if (dst) 398b42835dbSDavid S. Miller return dst; 399b42835dbSDavid S. Miller return ERR_PTR(err); 400b42835dbSDavid S. Miller } 401b42835dbSDavid S. Miller 4021da177e4SLinus Torvalds /* 4031da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 4041da177e4SLinus Torvalds */ 405b1cadc1aSEric Dumazet static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info, 406b1cadc1aSEric Dumazet const struct in6_addr *force_saddr) 4071da177e4SLinus Torvalds { 408c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 4091da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 4100660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 41184427d53SYOSHIFUJI Hideaki struct sock *sk; 41284427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 413b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 4141da177e4SLinus Torvalds struct dst_entry *dst; 4151da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 4164c9483b2SDavid S. Miller struct flowi6 fl6; 4171da177e4SLinus Torvalds struct icmpv6_msg msg; 418c14ac945SSoheil Hassas Yeganeh struct sockcm_cookie sockc_unused = {0}; 41926879da5SWei Wang struct ipcm6_cookie ipc6; 4201da177e4SLinus Torvalds int iif = 0; 4211da177e4SLinus Torvalds int addr_type = 0; 4221da177e4SLinus Torvalds int len; 4231da177e4SLinus Torvalds int err = 0; 424e110861fSLorenzo Colitti u32 mark = IP6_REPLY_MARK(net, skb->mark); 4251da177e4SLinus Torvalds 42627a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 42729a3cad5SSimon Horman (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb)) 4281da177e4SLinus Torvalds return; 4291da177e4SLinus Torvalds 4301da177e4SLinus Torvalds /* 4311da177e4SLinus Torvalds * Make sure we respect the rules 4321da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 4335f5624cfSPravin B Shelar * Rule (e.1) is enforced by not using icmp6_send 4341da177e4SLinus Torvalds * in any code that processes icmp errors. 4351da177e4SLinus Torvalds */ 4361da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 4371da177e4SLinus Torvalds 438446fab59SFX Le Bail if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) || 439d94c1f92SFX Le Bail ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr)) 4401da177e4SLinus Torvalds saddr = &hdr->daddr; 4411da177e4SLinus Torvalds 4421da177e4SLinus Torvalds /* 4431da177e4SLinus Torvalds * Dest addr check 4441da177e4SLinus Torvalds */ 4451da177e4SLinus Torvalds 4469a6b4b39Szhuyj if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) { 4471da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 4481da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 4491da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 4501da177e4SLinus Torvalds (opt_unrec(skb, info)))) 4511da177e4SLinus Torvalds return; 4521da177e4SLinus Torvalds 4531da177e4SLinus Torvalds saddr = NULL; 4541da177e4SLinus Torvalds } 4551da177e4SLinus Torvalds 4561da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 4571da177e4SLinus Torvalds 4581da177e4SLinus Torvalds /* 4591da177e4SLinus Torvalds * Source addr check 4601da177e4SLinus Torvalds */ 4611da177e4SLinus Torvalds 462842df073SHannes Frederic Sowa if (__ipv6_addr_needs_scope_id(addr_type)) 4631da177e4SLinus Torvalds iif = skb->dev->ifindex; 46479dc7e3fSDavid Ahern else { 46579dc7e3fSDavid Ahern dst = skb_dst(skb); 46679dc7e3fSDavid Ahern iif = l3mdev_master_ifindex(dst ? dst->dev : skb->dev); 46779dc7e3fSDavid Ahern } 4681da177e4SLinus Torvalds 4691da177e4SLinus Torvalds /* 4708de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 4718de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 4728de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 4738de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 4741da177e4SLinus Torvalds */ 4751da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 4764b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n", 4774b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 4781da177e4SLinus Torvalds return; 4791da177e4SLinus Torvalds } 4801da177e4SLinus Torvalds 4811da177e4SLinus Torvalds /* 4821da177e4SLinus Torvalds * Never answer to a ICMP packet. 4831da177e4SLinus Torvalds */ 4841da177e4SLinus Torvalds if (is_ineligible(skb)) { 4854b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n", 4864b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 4871da177e4SLinus Torvalds return; 4881da177e4SLinus Torvalds } 4891da177e4SLinus Torvalds 4907ba91ecbSJesper Dangaard Brouer /* Needed by both icmp_global_allow and icmpv6_xmit_lock */ 4917ba91ecbSJesper Dangaard Brouer local_bh_disable(); 4927ba91ecbSJesper Dangaard Brouer 4937ba91ecbSJesper Dangaard Brouer /* Check global sysctl_icmp_msgs_per_sec ratelimit */ 4947ba91ecbSJesper Dangaard Brouer if (!icmpv6_global_allow(type)) 4957ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 4967ba91ecbSJesper Dangaard Brouer 49779383236SMasahide NAKAMURA mip6_addr_swap(skb); 49879383236SMasahide NAKAMURA 4994c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 5004c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 5014e3fd7a0SAlexey Dobriyan fl6.daddr = hdr->saddr; 502b1cadc1aSEric Dumazet if (force_saddr) 503b1cadc1aSEric Dumazet saddr = force_saddr; 5041da177e4SLinus Torvalds if (saddr) 5054e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 506e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 5074c9483b2SDavid S. Miller fl6.flowi6_oif = iif; 5081958b856SDavid S. Miller fl6.fl6_icmp_type = type; 5091958b856SDavid S. Miller fl6.fl6_icmp_code = code; 510e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 5114c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 5121da177e4SLinus Torvalds 513fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 51463159f29SIan Morris if (!sk) 5157ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 516c0303efeSJesper Dangaard Brouer 517e110861fSLorenzo Colitti sk->sk_mark = mark; 518fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 519405666dbSDenis V. Lunev 5204c9483b2SDavid S. Miller if (!icmpv6_xrlim_allow(sk, type, &fl6)) 5211da177e4SLinus Torvalds goto out; 5221da177e4SLinus Torvalds 5231da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 5241da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 5251da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 5261da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 5271da177e4SLinus Torvalds 5284c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 5294c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 530c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 531c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 5321da177e4SLinus Torvalds 53338b7097bSHannes Frederic Sowa ipc6.tclass = np->tclass; 53438b7097bSHannes Frederic Sowa fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 53538b7097bSHannes Frederic Sowa 5364c9483b2SDavid S. Miller dst = icmpv6_route_lookup(net, skb, sk, &fl6); 537b42835dbSDavid S. Miller if (IS_ERR(dst)) 5381da177e4SLinus Torvalds goto out; 5398de3351eSYOSHIFUJI Hideaki 54026879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 54126879da5SWei Wang ipc6.dontfrag = np->dontfrag; 54226879da5SWei Wang ipc6.opt = NULL; 5431da177e4SLinus Torvalds 5441da177e4SLinus Torvalds msg.skb = skb; 545bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 546763ecff1SYasuyuki Kozakai msg.type = type; 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvalds len = skb->len - msg.offset; 5491da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); 5501da177e4SLinus Torvalds if (len < 0) { 5514b3418fbSBjørn Mork net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n", 5524b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5531da177e4SLinus Torvalds goto out_dst_release; 5541da177e4SLinus Torvalds } 5551da177e4SLinus Torvalds 556cfdf7647SEric Dumazet rcu_read_lock(); 557cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 5581da177e4SLinus Torvalds 5591da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, 5601da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 56126879da5SWei Wang sizeof(struct icmp6hdr), 56226879da5SWei Wang &ipc6, &fl6, (struct rt6_info *)dst, 56326879da5SWei Wang MSG_DONTWAIT, &sockc_unused); 5641da177e4SLinus Torvalds if (err) { 56543a43b60SHannes Frederic Sowa ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 5661da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 567cfdf7647SEric Dumazet } else { 568cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 569cfdf7647SEric Dumazet len + sizeof(struct icmp6hdr)); 5701da177e4SLinus Torvalds } 571cfdf7647SEric Dumazet rcu_read_unlock(); 5721da177e4SLinus Torvalds out_dst_release: 5731da177e4SLinus Torvalds dst_release(dst); 5741da177e4SLinus Torvalds out: 575405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5767ba91ecbSJesper Dangaard Brouer out_bh_enable: 5777ba91ecbSJesper Dangaard Brouer local_bh_enable(); 5781da177e4SLinus Torvalds } 5795f5624cfSPravin B Shelar 5805f5624cfSPravin B Shelar /* Slightly more convenient version of icmp6_send. 5815f5624cfSPravin B Shelar */ 5825f5624cfSPravin B Shelar void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) 5835f5624cfSPravin B Shelar { 584b1cadc1aSEric Dumazet icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL); 5855f5624cfSPravin B Shelar kfree_skb(skb); 5865f5624cfSPravin B Shelar } 5877159039aSYOSHIFUJI Hideaki 5885fbba8acSEric Dumazet /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH 5895fbba8acSEric Dumazet * if sufficient data bytes are available 5905fbba8acSEric Dumazet * @nhs is the size of the tunnel header(s) : 5915fbba8acSEric Dumazet * Either an IPv4 header for SIT encap 5925fbba8acSEric Dumazet * an IPv4 header + GRE header for GRE encap 5935fbba8acSEric Dumazet */ 59420e1954fSEric Dumazet int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type, 59520e1954fSEric Dumazet unsigned int data_len) 5965fbba8acSEric Dumazet { 5972d7a3b27SEric Dumazet struct in6_addr temp_saddr; 5985fbba8acSEric Dumazet struct rt6_info *rt; 5995fbba8acSEric Dumazet struct sk_buff *skb2; 60020e1954fSEric Dumazet u32 info = 0; 6015fbba8acSEric Dumazet 6025fbba8acSEric Dumazet if (!pskb_may_pull(skb, nhs + sizeof(struct ipv6hdr) + 8)) 6035fbba8acSEric Dumazet return 1; 6045fbba8acSEric Dumazet 60520e1954fSEric Dumazet /* RFC 4884 (partial) support for ICMP extensions */ 60620e1954fSEric Dumazet if (data_len < 128 || (data_len & 7) || skb->len < data_len) 60720e1954fSEric Dumazet data_len = 0; 60820e1954fSEric Dumazet 60920e1954fSEric Dumazet skb2 = data_len ? skb_copy(skb, GFP_ATOMIC) : skb_clone(skb, GFP_ATOMIC); 6105fbba8acSEric Dumazet 6115fbba8acSEric Dumazet if (!skb2) 6125fbba8acSEric Dumazet return 1; 6135fbba8acSEric Dumazet 6145fbba8acSEric Dumazet skb_dst_drop(skb2); 6155fbba8acSEric Dumazet skb_pull(skb2, nhs); 6165fbba8acSEric Dumazet skb_reset_network_header(skb2); 6175fbba8acSEric Dumazet 6185fbba8acSEric Dumazet rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 0); 6195fbba8acSEric Dumazet 6205fbba8acSEric Dumazet if (rt && rt->dst.dev) 6215fbba8acSEric Dumazet skb2->dev = rt->dst.dev; 6225fbba8acSEric Dumazet 6232d7a3b27SEric Dumazet ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr); 62420e1954fSEric Dumazet 62520e1954fSEric Dumazet if (data_len) { 62620e1954fSEric Dumazet /* RFC 4884 (partial) support : 62720e1954fSEric Dumazet * insert 0 padding at the end, before the extensions 62820e1954fSEric Dumazet */ 62920e1954fSEric Dumazet __skb_push(skb2, nhs); 63020e1954fSEric Dumazet skb_reset_network_header(skb2); 63120e1954fSEric Dumazet memmove(skb2->data, skb2->data + nhs, data_len - nhs); 63220e1954fSEric Dumazet memset(skb2->data + data_len - nhs, 0, nhs); 63320e1954fSEric Dumazet /* RFC 4884 4.5 : Length is measured in 64-bit words, 63420e1954fSEric Dumazet * and stored in reserved[0] 63520e1954fSEric Dumazet */ 63620e1954fSEric Dumazet info = (data_len/8) << 24; 63720e1954fSEric Dumazet } 6382d7a3b27SEric Dumazet if (type == ICMP_TIME_EXCEEDED) 6392d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 64020e1954fSEric Dumazet info, &temp_saddr); 6412d7a3b27SEric Dumazet else 6422d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 64320e1954fSEric Dumazet info, &temp_saddr); 6445fbba8acSEric Dumazet if (rt) 6455fbba8acSEric Dumazet ip6_rt_put(rt); 6465fbba8acSEric Dumazet 6475fbba8acSEric Dumazet kfree_skb(skb2); 6485fbba8acSEric Dumazet 6495fbba8acSEric Dumazet return 0; 6505fbba8acSEric Dumazet } 6515fbba8acSEric Dumazet EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach); 6525fbba8acSEric Dumazet 6531da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 6541da177e4SLinus Torvalds { 655c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 65684427d53SYOSHIFUJI Hideaki struct sock *sk; 6571da177e4SLinus Torvalds struct inet6_dev *idev; 65884427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 659b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 660cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 6611da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 6624c9483b2SDavid S. Miller struct flowi6 fl6; 6631da177e4SLinus Torvalds struct icmpv6_msg msg; 6641da177e4SLinus Torvalds struct dst_entry *dst; 66526879da5SWei Wang struct ipcm6_cookie ipc6; 6661da177e4SLinus Torvalds int err = 0; 667e110861fSLorenzo Colitti u32 mark = IP6_REPLY_MARK(net, skb->mark); 668c14ac945SSoheil Hassas Yeganeh struct sockcm_cookie sockc_unused = {0}; 6691da177e4SLinus Torvalds 6700660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 6711da177e4SLinus Torvalds 672509aba3bSFX Le Bail if (!ipv6_unicast_destination(skb) && 673ec35b61eSFX Le Bail !(net->ipv6.sysctl.anycast_src_echo_reply && 6742647a9b0SMartin KaFai Lau ipv6_anycast_destination(skb_dst(skb), saddr))) 6751da177e4SLinus Torvalds saddr = NULL; 6761da177e4SLinus Torvalds 6771da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 6781da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 6791da177e4SLinus Torvalds 6804c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 6814c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 6824e3fd7a0SAlexey Dobriyan fl6.daddr = ipv6_hdr(skb)->saddr; 6831da177e4SLinus Torvalds if (saddr) 6844e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 6859ff74384SDavid Ahern fl6.flowi6_oif = skb->dev->ifindex; 6861958b856SDavid S. Miller fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; 687e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 688e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 6894c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 6901da177e4SLinus Torvalds 6917ba91ecbSJesper Dangaard Brouer local_bh_disable(); 692fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 69363159f29SIan Morris if (!sk) 6947ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 695e110861fSLorenzo Colitti sk->sk_mark = mark; 696fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 697405666dbSDenis V. Lunev 6984c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 6994c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 700c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 701c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 7021da177e4SLinus Torvalds 703343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst, &fl6); 7041da177e4SLinus Torvalds if (err) 7051da177e4SLinus Torvalds goto out; 7064c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); 707452edd59SDavid S. Miller if (IS_ERR(dst)) 708e104411bSPatrick McHardy goto out; 7091da177e4SLinus Torvalds 710cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 7111da177e4SLinus Torvalds 7121da177e4SLinus Torvalds msg.skb = skb; 7131da177e4SLinus Torvalds msg.offset = 0; 714763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 7151da177e4SLinus Torvalds 71626879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 71726879da5SWei Wang ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 71826879da5SWei Wang ipc6.dontfrag = np->dontfrag; 71926879da5SWei Wang ipc6.opt = NULL; 72026879da5SWei Wang 7211da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 72226879da5SWei Wang sizeof(struct icmp6hdr), &ipc6, &fl6, 72313b52cd4SBrian Haley (struct rt6_info *)dst, MSG_DONTWAIT, 72426879da5SWei Wang &sockc_unused); 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds if (err) { 727a16292a0SEric Dumazet __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 7281da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 729cfdf7647SEric Dumazet } else { 730cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 731cfdf7647SEric Dumazet skb->len + sizeof(struct icmp6hdr)); 7321da177e4SLinus Torvalds } 7331da177e4SLinus Torvalds dst_release(dst); 7341da177e4SLinus Torvalds out: 735405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 7367ba91ecbSJesper Dangaard Brouer out_bh_enable: 7377ba91ecbSJesper Dangaard Brouer local_bh_enable(); 7381da177e4SLinus Torvalds } 7391da177e4SLinus Torvalds 740b94f1c09SDavid S. Miller void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 7411da177e4SLinus Torvalds { 74241135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 7431da177e4SLinus Torvalds int inner_offset; 74475f2811cSJesse Gross __be16 frag_off; 745f9242b6bSDavid S. Miller u8 nexthdr; 7467304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 7471da177e4SLinus Torvalds 7481da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 7497304fe46SDuan Jiong goto out; 7501da177e4SLinus Torvalds 7511da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 7521da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 7531da177e4SLinus Torvalds /* now skip over extension headers */ 75475f2811cSJesse Gross inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 75575f2811cSJesse Gross &nexthdr, &frag_off); 7561da177e4SLinus Torvalds if (inner_offset < 0) 7577304fe46SDuan Jiong goto out; 7581da177e4SLinus Torvalds } else { 7591da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 7601da177e4SLinus Torvalds } 7611da177e4SLinus Torvalds 7621da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 7631da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 7647304fe46SDuan Jiong goto out; 7651da177e4SLinus Torvalds 7661da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 7671da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 7681da177e4SLinus Torvalds pmtu discovery. 7691da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 7701da177e4SLinus Torvalds --ANK (980726) 7711da177e4SLinus Torvalds */ 7721da177e4SLinus Torvalds 773f9242b6bSDavid S. Miller ipprot = rcu_dereference(inet6_protos[nexthdr]); 7741da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 7751da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 7761da177e4SLinus Torvalds 77769d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 7787304fe46SDuan Jiong return; 7797304fe46SDuan Jiong 7807304fe46SDuan Jiong out: 781a16292a0SEric Dumazet __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); 7821da177e4SLinus Torvalds } 7831da177e4SLinus Torvalds 7841da177e4SLinus Torvalds /* 7851da177e4SLinus Torvalds * Handle icmp messages 7861da177e4SLinus Torvalds */ 7871da177e4SLinus Torvalds 788e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 7891da177e4SLinus Torvalds { 7901da177e4SLinus Torvalds struct net_device *dev = skb->dev; 7911da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 792b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 7931da177e4SLinus Torvalds struct icmp6hdr *hdr; 794d5fdd6baSBrian Haley u8 type; 795e3e32170SRick Jones bool success = false; 7961da177e4SLinus Torvalds 797aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 798def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 7998b7817f3SHerbert Xu int nh; 8008b7817f3SHerbert Xu 801def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 802aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 803aebcf82cSHerbert Xu goto drop_no_count; 804aebcf82cSHerbert Xu 80581aded24SDavid S. Miller if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) 8068b7817f3SHerbert Xu goto drop_no_count; 8078b7817f3SHerbert Xu 8088b7817f3SHerbert Xu nh = skb_network_offset(skb); 8098b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 8108b7817f3SHerbert Xu 8118b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 8128b7817f3SHerbert Xu goto drop_no_count; 8138b7817f3SHerbert Xu 8148b7817f3SHerbert Xu skb_set_network_header(skb, nh); 8158b7817f3SHerbert Xu } 8168b7817f3SHerbert Xu 817a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS); 8181da177e4SLinus Torvalds 8190660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 8200660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 8211da177e4SLinus Torvalds 82239471ac8STom Herbert if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { 823ba7a46f1SJoe Perches net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", 8240c6ce78aSHarvey Harrison saddr, daddr); 8256a5dc9e5SEric Dumazet goto csum_error; 8261da177e4SLinus Torvalds } 8271da177e4SLinus Torvalds 8288cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 8298cf22943SHerbert Xu goto discard_it; 8301da177e4SLinus Torvalds 831cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 8321da177e4SLinus Torvalds 8331da177e4SLinus Torvalds type = hdr->icmp6_type; 8341da177e4SLinus Torvalds 835f3832ed2SEric Dumazet ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type); 8361da177e4SLinus Torvalds 8371da177e4SLinus Torvalds switch (type) { 8381da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 8391da177e4SLinus Torvalds icmpv6_echo_reply(skb); 8401da177e4SLinus Torvalds break; 8411da177e4SLinus Torvalds 8421da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 843e3e32170SRick Jones success = ping_rcv(skb); 8441da177e4SLinus Torvalds break; 8451da177e4SLinus Torvalds 8461da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 8471da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 8481da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 8491da177e4SLinus Torvalds destination cache will allow to solve this problem 8501da177e4SLinus Torvalds --ANK (980726) 8511da177e4SLinus Torvalds */ 8521da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 8531da177e4SLinus Torvalds goto discard_it; 854cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 8551da177e4SLinus Torvalds 8561da177e4SLinus Torvalds /* 8571da177e4SLinus Torvalds * Drop through to notify 8581da177e4SLinus Torvalds */ 8591da177e4SLinus Torvalds 8601da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 8611da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 8621da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 8631da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 8641da177e4SLinus Torvalds break; 8651da177e4SLinus Torvalds 8661da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 8671da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 8681da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 8691da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 8701da177e4SLinus Torvalds case NDISC_REDIRECT: 8711da177e4SLinus Torvalds ndisc_rcv(skb); 8721da177e4SLinus Torvalds break; 8731da177e4SLinus Torvalds 8741da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 8751da177e4SLinus Torvalds igmp6_event_query(skb); 8761da177e4SLinus Torvalds break; 8771da177e4SLinus Torvalds 8781da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 8791da177e4SLinus Torvalds igmp6_event_report(skb); 8801da177e4SLinus Torvalds break; 8811da177e4SLinus Torvalds 8821da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 8831da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 8841da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 8851da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 8861da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 8871da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 8881da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 8891da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 8901da177e4SLinus Torvalds break; 8911da177e4SLinus Torvalds 8921da177e4SLinus Torvalds default: 8931da177e4SLinus Torvalds /* informational */ 8941da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 8951da177e4SLinus Torvalds break; 8961da177e4SLinus Torvalds 8974b3418fbSBjørn Mork net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n", 8984b3418fbSBjørn Mork saddr, daddr); 899ea85a0a2SDavid S. Miller 9001da177e4SLinus Torvalds /* 9011da177e4SLinus Torvalds * error of unknown type. 9021da177e4SLinus Torvalds * must pass to upper level 9031da177e4SLinus Torvalds */ 9041da177e4SLinus Torvalds 9051da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 9063ff50b79SStephen Hemminger } 9073ff50b79SStephen Hemminger 908e3e32170SRick Jones /* until the v6 path can be better sorted assume failure and 909e3e32170SRick Jones * preserve the status quo behaviour for the rest of the paths to here 910e3e32170SRick Jones */ 911e3e32170SRick Jones if (success) 912e3e32170SRick Jones consume_skb(skb); 913e3e32170SRick Jones else 9141da177e4SLinus Torvalds kfree_skb(skb); 915e3e32170SRick Jones 9161da177e4SLinus Torvalds return 0; 9171da177e4SLinus Torvalds 9186a5dc9e5SEric Dumazet csum_error: 919a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); 9201da177e4SLinus Torvalds discard_it: 921a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS); 9228b7817f3SHerbert Xu drop_no_count: 9231da177e4SLinus Torvalds kfree_skb(skb); 9241da177e4SLinus Torvalds return 0; 9251da177e4SLinus Torvalds } 9261da177e4SLinus Torvalds 9274c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, 92895e41e93SYOSHIFUJI Hideaki u8 type, 92995e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 93095e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 93195e41e93SYOSHIFUJI Hideaki int oif) 93295e41e93SYOSHIFUJI Hideaki { 9334c9483b2SDavid S. Miller memset(fl6, 0, sizeof(*fl6)); 9344e3fd7a0SAlexey Dobriyan fl6->saddr = *saddr; 9354e3fd7a0SAlexey Dobriyan fl6->daddr = *daddr; 9364c9483b2SDavid S. Miller fl6->flowi6_proto = IPPROTO_ICMPV6; 9371958b856SDavid S. Miller fl6->fl6_icmp_type = type; 9381958b856SDavid S. Miller fl6->fl6_icmp_code = 0; 9394c9483b2SDavid S. Miller fl6->flowi6_oif = oif; 9404c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); 94195e41e93SYOSHIFUJI Hideaki } 94295e41e93SYOSHIFUJI Hideaki 94398c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 9441da177e4SLinus Torvalds { 9451da177e4SLinus Torvalds struct sock *sk; 9461da177e4SLinus Torvalds int err, i, j; 9471da177e4SLinus Torvalds 94898c6d1b2SDenis V. Lunev net->ipv6.icmp_sk = 94998c6d1b2SDenis V. Lunev kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); 95063159f29SIan Morris if (!net->ipv6.icmp_sk) 95179c91159SDenis V. Lunev return -ENOMEM; 95279c91159SDenis V. Lunev 9536f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 9541ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 9551ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 9561da177e4SLinus Torvalds if (err < 0) { 957f3213831SJoe Perches pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", 9581da177e4SLinus Torvalds err); 9591da177e4SLinus Torvalds goto fail; 9601da177e4SLinus Torvalds } 9611da177e4SLinus Torvalds 9621ed8516fSDenis V. Lunev net->ipv6.icmp_sk[i] = sk; 9635c8cafd6SDenis V. Lunev 9641da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 9651da177e4SLinus Torvalds * sk_buff struct overhead. 9661da177e4SLinus Torvalds */ 96787fb4b7bSEric Dumazet sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); 9681da177e4SLinus Torvalds } 9691da177e4SLinus Torvalds return 0; 9701da177e4SLinus Torvalds 9711da177e4SLinus Torvalds fail: 9725c8cafd6SDenis V. Lunev for (j = 0; j < i; j++) 9731ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); 97498c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 9751da177e4SLinus Torvalds return err; 9761da177e4SLinus Torvalds } 9771da177e4SLinus Torvalds 97898c6d1b2SDenis V. Lunev static void __net_exit icmpv6_sk_exit(struct net *net) 9791da177e4SLinus Torvalds { 9801da177e4SLinus Torvalds int i; 9811da177e4SLinus Torvalds 9826f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 9831ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); 9841da177e4SLinus Torvalds } 98598c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 98698c6d1b2SDenis V. Lunev } 98798c6d1b2SDenis V. Lunev 9888ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 98998c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 99098c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 99198c6d1b2SDenis V. Lunev }; 99298c6d1b2SDenis V. Lunev 99398c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 99498c6d1b2SDenis V. Lunev { 99598c6d1b2SDenis V. Lunev int err; 99698c6d1b2SDenis V. Lunev 99798c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 99898c6d1b2SDenis V. Lunev if (err < 0) 99998c6d1b2SDenis V. Lunev return err; 100098c6d1b2SDenis V. Lunev 100198c6d1b2SDenis V. Lunev err = -EAGAIN; 100298c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 100398c6d1b2SDenis V. Lunev goto fail; 10045f5624cfSPravin B Shelar 10055f5624cfSPravin B Shelar err = inet6_register_icmp_sender(icmp6_send); 10065f5624cfSPravin B Shelar if (err) 10075f5624cfSPravin B Shelar goto sender_reg_err; 100898c6d1b2SDenis V. Lunev return 0; 100998c6d1b2SDenis V. Lunev 10105f5624cfSPravin B Shelar sender_reg_err: 10115f5624cfSPravin B Shelar inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 101298c6d1b2SDenis V. Lunev fail: 1013f3213831SJoe Perches pr_err("Failed to register ICMP6 protocol\n"); 101498c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 101598c6d1b2SDenis V. Lunev return err; 101698c6d1b2SDenis V. Lunev } 101798c6d1b2SDenis V. Lunev 10188ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 101998c6d1b2SDenis V. Lunev { 10205f5624cfSPravin B Shelar inet6_unregister_icmp_sender(icmp6_send); 102198c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 10221da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 10231da177e4SLinus Torvalds } 10241da177e4SLinus Torvalds 102598c6d1b2SDenis V. Lunev 10269b5b5cffSArjan van de Ven static const struct icmp6_err { 10271da177e4SLinus Torvalds int err; 10281da177e4SLinus Torvalds int fatal; 10291da177e4SLinus Torvalds } tab_unreach[] = { 10301da177e4SLinus Torvalds { /* NOROUTE */ 10311da177e4SLinus Torvalds .err = ENETUNREACH, 10321da177e4SLinus Torvalds .fatal = 0, 10331da177e4SLinus Torvalds }, 10341da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 10351da177e4SLinus Torvalds .err = EACCES, 10361da177e4SLinus Torvalds .fatal = 1, 10371da177e4SLinus Torvalds }, 10381da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 10391da177e4SLinus Torvalds .err = EHOSTUNREACH, 10401da177e4SLinus Torvalds .fatal = 0, 10411da177e4SLinus Torvalds }, 10421da177e4SLinus Torvalds { /* ADDR_UNREACH */ 10431da177e4SLinus Torvalds .err = EHOSTUNREACH, 10441da177e4SLinus Torvalds .fatal = 0, 10451da177e4SLinus Torvalds }, 10461da177e4SLinus Torvalds { /* PORT_UNREACH */ 10471da177e4SLinus Torvalds .err = ECONNREFUSED, 10481da177e4SLinus Torvalds .fatal = 1, 10491da177e4SLinus Torvalds }, 105061e76b17SJiri Bohac { /* POLICY_FAIL */ 105161e76b17SJiri Bohac .err = EACCES, 105261e76b17SJiri Bohac .fatal = 1, 105361e76b17SJiri Bohac }, 105461e76b17SJiri Bohac { /* REJECT_ROUTE */ 105561e76b17SJiri Bohac .err = EACCES, 105661e76b17SJiri Bohac .fatal = 1, 105761e76b17SJiri Bohac }, 10581da177e4SLinus Torvalds }; 10591da177e4SLinus Torvalds 1060d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 10611da177e4SLinus Torvalds { 10621da177e4SLinus Torvalds int fatal = 0; 10631da177e4SLinus Torvalds 10641da177e4SLinus Torvalds *err = EPROTO; 10651da177e4SLinus Torvalds 10661da177e4SLinus Torvalds switch (type) { 10671da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 10681da177e4SLinus Torvalds fatal = 1; 106961e76b17SJiri Bohac if (code < ARRAY_SIZE(tab_unreach)) { 10701da177e4SLinus Torvalds *err = tab_unreach[code].err; 10711da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 10721da177e4SLinus Torvalds } 10731da177e4SLinus Torvalds break; 10741da177e4SLinus Torvalds 10751da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 10761da177e4SLinus Torvalds *err = EMSGSIZE; 10771da177e4SLinus Torvalds break; 10781da177e4SLinus Torvalds 10791da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 10801da177e4SLinus Torvalds *err = EPROTO; 10811da177e4SLinus Torvalds fatal = 1; 10821da177e4SLinus Torvalds break; 10831da177e4SLinus Torvalds 10841da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 10851da177e4SLinus Torvalds *err = EHOSTUNREACH; 10861da177e4SLinus Torvalds break; 10873ff50b79SStephen Hemminger } 10881da177e4SLinus Torvalds 10891da177e4SLinus Torvalds return fatal; 10901da177e4SLinus Torvalds } 10917159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 10927159039aSYOSHIFUJI Hideaki 10931da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 1094e8243534Sstephen hemminger static struct ctl_table ipv6_icmp_table_template[] = { 10951da177e4SLinus Torvalds { 10961da177e4SLinus Torvalds .procname = "ratelimit", 109741a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 10981da177e4SLinus Torvalds .maxlen = sizeof(int), 10991da177e4SLinus Torvalds .mode = 0644, 11006d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 11011da177e4SLinus Torvalds }, 1102f8572d8fSEric W. Biederman { }, 11031da177e4SLinus Torvalds }; 1104760f2d01SDaniel Lezcano 11052c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 1106760f2d01SDaniel Lezcano { 1107760f2d01SDaniel Lezcano struct ctl_table *table; 1108760f2d01SDaniel Lezcano 1109760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 1110760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 1111760f2d01SDaniel Lezcano GFP_KERNEL); 11125ee09105SYOSHIFUJI Hideaki 1113c027aab4SEric W. Biederman if (table) 11145ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 11155ee09105SYOSHIFUJI Hideaki 1116760f2d01SDaniel Lezcano return table; 1117760f2d01SDaniel Lezcano } 11181da177e4SLinus Torvalds #endif 1119