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 4624832c30dSDavid Ahern if (__ipv6_addr_needs_scope_id(addr_type)) { 4631da177e4SLinus Torvalds iif = skb->dev->ifindex; 4644832c30dSDavid Ahern 4654832c30dSDavid Ahern /* for local packets, get the real device index */ 4664832c30dSDavid Ahern if (iif == LOOPBACK_IFINDEX) { 4674832c30dSDavid Ahern dst = skb_dst(skb); 4684832c30dSDavid Ahern if (dst) { 4694832c30dSDavid Ahern struct rt6_info *rt; 4704832c30dSDavid Ahern 4714832c30dSDavid Ahern rt = container_of(dst, struct rt6_info, dst); 4724832c30dSDavid Ahern iif = rt->rt6i_idev->dev->ifindex; 4734832c30dSDavid Ahern } 4744832c30dSDavid Ahern } 4754832c30dSDavid Ahern } else { 47679dc7e3fSDavid Ahern dst = skb_dst(skb); 47779dc7e3fSDavid Ahern iif = l3mdev_master_ifindex(dst ? dst->dev : skb->dev); 47879dc7e3fSDavid Ahern } 4791da177e4SLinus Torvalds 4801da177e4SLinus Torvalds /* 4818de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 4828de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 4838de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 4848de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 4851da177e4SLinus Torvalds */ 4861da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 4874b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n", 4884b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 4891da177e4SLinus Torvalds return; 4901da177e4SLinus Torvalds } 4911da177e4SLinus Torvalds 4921da177e4SLinus Torvalds /* 4931da177e4SLinus Torvalds * Never answer to a ICMP packet. 4941da177e4SLinus Torvalds */ 4951da177e4SLinus Torvalds if (is_ineligible(skb)) { 4964b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n", 4974b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 4981da177e4SLinus Torvalds return; 4991da177e4SLinus Torvalds } 5001da177e4SLinus Torvalds 5017ba91ecbSJesper Dangaard Brouer /* Needed by both icmp_global_allow and icmpv6_xmit_lock */ 5027ba91ecbSJesper Dangaard Brouer local_bh_disable(); 5037ba91ecbSJesper Dangaard Brouer 5047ba91ecbSJesper Dangaard Brouer /* Check global sysctl_icmp_msgs_per_sec ratelimit */ 505849a44deSJesper Dangaard Brouer if (!(skb->dev->flags&IFF_LOOPBACK) && !icmpv6_global_allow(type)) 5067ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 5077ba91ecbSJesper Dangaard Brouer 50879383236SMasahide NAKAMURA mip6_addr_swap(skb); 50979383236SMasahide NAKAMURA 5104c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 5114c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 5124e3fd7a0SAlexey Dobriyan fl6.daddr = hdr->saddr; 513b1cadc1aSEric Dumazet if (force_saddr) 514b1cadc1aSEric Dumazet saddr = force_saddr; 5151da177e4SLinus Torvalds if (saddr) 5164e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 517e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 5184c9483b2SDavid S. Miller fl6.flowi6_oif = iif; 5191958b856SDavid S. Miller fl6.fl6_icmp_type = type; 5201958b856SDavid S. Miller fl6.fl6_icmp_code = code; 521e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 5224c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 5231da177e4SLinus Torvalds 524fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 52563159f29SIan Morris if (!sk) 5267ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 527c0303efeSJesper Dangaard Brouer 528e110861fSLorenzo Colitti sk->sk_mark = mark; 529fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 530405666dbSDenis V. Lunev 5314c9483b2SDavid S. Miller if (!icmpv6_xrlim_allow(sk, type, &fl6)) 5321da177e4SLinus Torvalds goto out; 5331da177e4SLinus Torvalds 5341da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 5351da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 5361da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 5371da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 5381da177e4SLinus Torvalds 5394c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 5404c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 541c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 542c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 5431da177e4SLinus Torvalds 54438b7097bSHannes Frederic Sowa ipc6.tclass = np->tclass; 54538b7097bSHannes Frederic Sowa fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 54638b7097bSHannes Frederic Sowa 5474c9483b2SDavid S. Miller dst = icmpv6_route_lookup(net, skb, sk, &fl6); 548b42835dbSDavid S. Miller if (IS_ERR(dst)) 5491da177e4SLinus Torvalds goto out; 5508de3351eSYOSHIFUJI Hideaki 55126879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 55226879da5SWei Wang ipc6.dontfrag = np->dontfrag; 55326879da5SWei Wang ipc6.opt = NULL; 5541da177e4SLinus Torvalds 5551da177e4SLinus Torvalds msg.skb = skb; 556bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 557763ecff1SYasuyuki Kozakai msg.type = type; 5581da177e4SLinus Torvalds 5591da177e4SLinus Torvalds len = skb->len - msg.offset; 5601da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); 5611da177e4SLinus Torvalds if (len < 0) { 5624b3418fbSBjørn Mork net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n", 5634b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5641da177e4SLinus Torvalds goto out_dst_release; 5651da177e4SLinus Torvalds } 5661da177e4SLinus Torvalds 567cfdf7647SEric Dumazet rcu_read_lock(); 568cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 5691da177e4SLinus Torvalds 5701da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, 5711da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 57226879da5SWei Wang sizeof(struct icmp6hdr), 57326879da5SWei Wang &ipc6, &fl6, (struct rt6_info *)dst, 57426879da5SWei Wang MSG_DONTWAIT, &sockc_unused); 5751da177e4SLinus Torvalds if (err) { 57643a43b60SHannes Frederic Sowa ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 5771da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 578cfdf7647SEric Dumazet } else { 579cfdf7647SEric Dumazet err = 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 6295fbba8acSEric Dumazet rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 0); 6305fbba8acSEric Dumazet 6315fbba8acSEric Dumazet if (rt && rt->dst.dev) 6325fbba8acSEric Dumazet skb2->dev = rt->dst.dev; 6335fbba8acSEric Dumazet 6342d7a3b27SEric Dumazet ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr); 63520e1954fSEric Dumazet 63620e1954fSEric Dumazet if (data_len) { 63720e1954fSEric Dumazet /* RFC 4884 (partial) support : 63820e1954fSEric Dumazet * insert 0 padding at the end, before the extensions 63920e1954fSEric Dumazet */ 64020e1954fSEric Dumazet __skb_push(skb2, nhs); 64120e1954fSEric Dumazet skb_reset_network_header(skb2); 64220e1954fSEric Dumazet memmove(skb2->data, skb2->data + nhs, data_len - nhs); 64320e1954fSEric Dumazet memset(skb2->data + data_len - nhs, 0, nhs); 64420e1954fSEric Dumazet /* RFC 4884 4.5 : Length is measured in 64-bit words, 64520e1954fSEric Dumazet * and stored in reserved[0] 64620e1954fSEric Dumazet */ 64720e1954fSEric Dumazet info = (data_len/8) << 24; 64820e1954fSEric Dumazet } 6492d7a3b27SEric Dumazet if (type == ICMP_TIME_EXCEEDED) 6502d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 65120e1954fSEric Dumazet info, &temp_saddr); 6522d7a3b27SEric Dumazet else 6532d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 65420e1954fSEric Dumazet info, &temp_saddr); 6555fbba8acSEric Dumazet if (rt) 6565fbba8acSEric Dumazet ip6_rt_put(rt); 6575fbba8acSEric Dumazet 6585fbba8acSEric Dumazet kfree_skb(skb2); 6595fbba8acSEric Dumazet 6605fbba8acSEric Dumazet return 0; 6615fbba8acSEric Dumazet } 6625fbba8acSEric Dumazet EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach); 6635fbba8acSEric Dumazet 6641da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 6651da177e4SLinus Torvalds { 666c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 66784427d53SYOSHIFUJI Hideaki struct sock *sk; 6681da177e4SLinus Torvalds struct inet6_dev *idev; 66984427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 670b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 671cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 6721da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 6734c9483b2SDavid S. Miller struct flowi6 fl6; 6741da177e4SLinus Torvalds struct icmpv6_msg msg; 6751da177e4SLinus Torvalds struct dst_entry *dst; 67626879da5SWei Wang struct ipcm6_cookie ipc6; 6771da177e4SLinus Torvalds int err = 0; 678e110861fSLorenzo Colitti u32 mark = IP6_REPLY_MARK(net, skb->mark); 679c14ac945SSoheil Hassas Yeganeh struct sockcm_cookie sockc_unused = {0}; 6801da177e4SLinus Torvalds 6810660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 6821da177e4SLinus Torvalds 683509aba3bSFX Le Bail if (!ipv6_unicast_destination(skb) && 684ec35b61eSFX Le Bail !(net->ipv6.sysctl.anycast_src_echo_reply && 6852647a9b0SMartin KaFai Lau ipv6_anycast_destination(skb_dst(skb), saddr))) 6861da177e4SLinus Torvalds saddr = NULL; 6871da177e4SLinus Torvalds 6881da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 6891da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 6901da177e4SLinus Torvalds 6914c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 6924c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 6934e3fd7a0SAlexey Dobriyan fl6.daddr = ipv6_hdr(skb)->saddr; 6941da177e4SLinus Torvalds if (saddr) 6954e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 6969ff74384SDavid Ahern fl6.flowi6_oif = skb->dev->ifindex; 6971958b856SDavid S. Miller fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; 698e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 699e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 7004c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 7011da177e4SLinus Torvalds 7027ba91ecbSJesper Dangaard Brouer local_bh_disable(); 703fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 70463159f29SIan Morris if (!sk) 7057ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 706e110861fSLorenzo Colitti sk->sk_mark = mark; 707fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 708405666dbSDenis V. Lunev 7094c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 7104c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 711c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 712c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 7131da177e4SLinus Torvalds 714343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst, &fl6); 7151da177e4SLinus Torvalds if (err) 7161da177e4SLinus Torvalds goto out; 7174c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); 718452edd59SDavid S. Miller if (IS_ERR(dst)) 719e104411bSPatrick McHardy goto out; 7201da177e4SLinus Torvalds 721cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 7221da177e4SLinus Torvalds 7231da177e4SLinus Torvalds msg.skb = skb; 7241da177e4SLinus Torvalds msg.offset = 0; 725763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 7261da177e4SLinus Torvalds 72726879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 72826879da5SWei Wang ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 72926879da5SWei Wang ipc6.dontfrag = np->dontfrag; 73026879da5SWei Wang ipc6.opt = NULL; 73126879da5SWei Wang 7321da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 73326879da5SWei Wang sizeof(struct icmp6hdr), &ipc6, &fl6, 73413b52cd4SBrian Haley (struct rt6_info *)dst, MSG_DONTWAIT, 73526879da5SWei Wang &sockc_unused); 7361da177e4SLinus Torvalds 7371da177e4SLinus Torvalds if (err) { 738a16292a0SEric Dumazet __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 7391da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 740cfdf7647SEric Dumazet } else { 741cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 742cfdf7647SEric Dumazet skb->len + sizeof(struct icmp6hdr)); 7431da177e4SLinus Torvalds } 7441da177e4SLinus Torvalds dst_release(dst); 7451da177e4SLinus Torvalds out: 746405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 7477ba91ecbSJesper Dangaard Brouer out_bh_enable: 7487ba91ecbSJesper Dangaard Brouer local_bh_enable(); 7491da177e4SLinus Torvalds } 7501da177e4SLinus Torvalds 751b94f1c09SDavid S. Miller void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 7521da177e4SLinus Torvalds { 75341135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 7541da177e4SLinus Torvalds int inner_offset; 75575f2811cSJesse Gross __be16 frag_off; 756f9242b6bSDavid S. Miller u8 nexthdr; 7577304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 7581da177e4SLinus Torvalds 7591da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 7607304fe46SDuan Jiong goto out; 7611da177e4SLinus Torvalds 7621da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 7631da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 7641da177e4SLinus Torvalds /* now skip over extension headers */ 76575f2811cSJesse Gross inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 76675f2811cSJesse Gross &nexthdr, &frag_off); 7671da177e4SLinus Torvalds if (inner_offset < 0) 7687304fe46SDuan Jiong goto out; 7691da177e4SLinus Torvalds } else { 7701da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 7711da177e4SLinus Torvalds } 7721da177e4SLinus Torvalds 7731da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 7741da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 7757304fe46SDuan Jiong goto out; 7761da177e4SLinus Torvalds 7771da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 7781da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 7791da177e4SLinus Torvalds pmtu discovery. 7801da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 7811da177e4SLinus Torvalds --ANK (980726) 7821da177e4SLinus Torvalds */ 7831da177e4SLinus Torvalds 784f9242b6bSDavid S. Miller ipprot = rcu_dereference(inet6_protos[nexthdr]); 7851da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 7861da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 7871da177e4SLinus Torvalds 78869d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 7897304fe46SDuan Jiong return; 7907304fe46SDuan Jiong 7917304fe46SDuan Jiong out: 792a16292a0SEric Dumazet __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); 7931da177e4SLinus Torvalds } 7941da177e4SLinus Torvalds 7951da177e4SLinus Torvalds /* 7961da177e4SLinus Torvalds * Handle icmp messages 7971da177e4SLinus Torvalds */ 7981da177e4SLinus Torvalds 799e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 8001da177e4SLinus Torvalds { 8011da177e4SLinus Torvalds struct net_device *dev = skb->dev; 8021da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 803b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 8041da177e4SLinus Torvalds struct icmp6hdr *hdr; 805d5fdd6baSBrian Haley u8 type; 806e3e32170SRick Jones bool success = false; 8071da177e4SLinus Torvalds 808aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 809def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 8108b7817f3SHerbert Xu int nh; 8118b7817f3SHerbert Xu 812def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 813aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 814aebcf82cSHerbert Xu goto drop_no_count; 815aebcf82cSHerbert Xu 81681aded24SDavid S. Miller if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) 8178b7817f3SHerbert Xu goto drop_no_count; 8188b7817f3SHerbert Xu 8198b7817f3SHerbert Xu nh = skb_network_offset(skb); 8208b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 8218b7817f3SHerbert Xu 8228b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 8238b7817f3SHerbert Xu goto drop_no_count; 8248b7817f3SHerbert Xu 8258b7817f3SHerbert Xu skb_set_network_header(skb, nh); 8268b7817f3SHerbert Xu } 8278b7817f3SHerbert Xu 828a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS); 8291da177e4SLinus Torvalds 8300660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 8310660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 8321da177e4SLinus Torvalds 83339471ac8STom Herbert if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { 834ba7a46f1SJoe Perches net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", 8350c6ce78aSHarvey Harrison saddr, daddr); 8366a5dc9e5SEric Dumazet goto csum_error; 8371da177e4SLinus Torvalds } 8381da177e4SLinus Torvalds 8398cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 8408cf22943SHerbert Xu goto discard_it; 8411da177e4SLinus Torvalds 842cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 8431da177e4SLinus Torvalds 8441da177e4SLinus Torvalds type = hdr->icmp6_type; 8451da177e4SLinus Torvalds 846f3832ed2SEric Dumazet ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type); 8471da177e4SLinus Torvalds 8481da177e4SLinus Torvalds switch (type) { 8491da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 8501da177e4SLinus Torvalds icmpv6_echo_reply(skb); 8511da177e4SLinus Torvalds break; 8521da177e4SLinus Torvalds 8531da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 854e3e32170SRick Jones success = ping_rcv(skb); 8551da177e4SLinus Torvalds break; 8561da177e4SLinus Torvalds 8571da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 8581da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 8591da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 8601da177e4SLinus Torvalds destination cache will allow to solve this problem 8611da177e4SLinus Torvalds --ANK (980726) 8621da177e4SLinus Torvalds */ 8631da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 8641da177e4SLinus Torvalds goto discard_it; 865cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 8661da177e4SLinus Torvalds 8671da177e4SLinus Torvalds /* 8681da177e4SLinus Torvalds * Drop through to notify 8691da177e4SLinus Torvalds */ 8701da177e4SLinus Torvalds 8711da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 8721da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 8731da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 8741da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 8751da177e4SLinus Torvalds break; 8761da177e4SLinus Torvalds 8771da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 8781da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 8791da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 8801da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 8811da177e4SLinus Torvalds case NDISC_REDIRECT: 8821da177e4SLinus Torvalds ndisc_rcv(skb); 8831da177e4SLinus Torvalds break; 8841da177e4SLinus Torvalds 8851da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 8861da177e4SLinus Torvalds igmp6_event_query(skb); 8871da177e4SLinus Torvalds break; 8881da177e4SLinus Torvalds 8891da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 8901da177e4SLinus Torvalds igmp6_event_report(skb); 8911da177e4SLinus Torvalds break; 8921da177e4SLinus Torvalds 8931da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 8941da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 8951da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 8961da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 8971da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 8981da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 8991da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 9001da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 9011da177e4SLinus Torvalds break; 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds default: 9041da177e4SLinus Torvalds /* informational */ 9051da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 9061da177e4SLinus Torvalds break; 9071da177e4SLinus Torvalds 9084b3418fbSBjørn Mork net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n", 9094b3418fbSBjørn Mork saddr, daddr); 910ea85a0a2SDavid S. Miller 9111da177e4SLinus Torvalds /* 9121da177e4SLinus Torvalds * error of unknown type. 9131da177e4SLinus Torvalds * must pass to upper level 9141da177e4SLinus Torvalds */ 9151da177e4SLinus Torvalds 9161da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 9173ff50b79SStephen Hemminger } 9183ff50b79SStephen Hemminger 919e3e32170SRick Jones /* until the v6 path can be better sorted assume failure and 920e3e32170SRick Jones * preserve the status quo behaviour for the rest of the paths to here 921e3e32170SRick Jones */ 922e3e32170SRick Jones if (success) 923e3e32170SRick Jones consume_skb(skb); 924e3e32170SRick Jones else 9251da177e4SLinus Torvalds kfree_skb(skb); 926e3e32170SRick Jones 9271da177e4SLinus Torvalds return 0; 9281da177e4SLinus Torvalds 9296a5dc9e5SEric Dumazet csum_error: 930a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); 9311da177e4SLinus Torvalds discard_it: 932a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS); 9338b7817f3SHerbert Xu drop_no_count: 9341da177e4SLinus Torvalds kfree_skb(skb); 9351da177e4SLinus Torvalds return 0; 9361da177e4SLinus Torvalds } 9371da177e4SLinus Torvalds 9384c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, 93995e41e93SYOSHIFUJI Hideaki u8 type, 94095e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 94195e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 94295e41e93SYOSHIFUJI Hideaki int oif) 94395e41e93SYOSHIFUJI Hideaki { 9444c9483b2SDavid S. Miller memset(fl6, 0, sizeof(*fl6)); 9454e3fd7a0SAlexey Dobriyan fl6->saddr = *saddr; 9464e3fd7a0SAlexey Dobriyan fl6->daddr = *daddr; 9474c9483b2SDavid S. Miller fl6->flowi6_proto = IPPROTO_ICMPV6; 9481958b856SDavid S. Miller fl6->fl6_icmp_type = type; 9491958b856SDavid S. Miller fl6->fl6_icmp_code = 0; 9504c9483b2SDavid S. Miller fl6->flowi6_oif = oif; 9514c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); 95295e41e93SYOSHIFUJI Hideaki } 95395e41e93SYOSHIFUJI Hideaki 95498c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 9551da177e4SLinus Torvalds { 9561da177e4SLinus Torvalds struct sock *sk; 9571da177e4SLinus Torvalds int err, i, j; 9581da177e4SLinus Torvalds 95998c6d1b2SDenis V. Lunev net->ipv6.icmp_sk = 96098c6d1b2SDenis V. Lunev kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); 96163159f29SIan Morris if (!net->ipv6.icmp_sk) 96279c91159SDenis V. Lunev return -ENOMEM; 96379c91159SDenis V. Lunev 9646f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 9651ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 9661ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 9671da177e4SLinus Torvalds if (err < 0) { 968f3213831SJoe Perches pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", 9691da177e4SLinus Torvalds err); 9701da177e4SLinus Torvalds goto fail; 9711da177e4SLinus Torvalds } 9721da177e4SLinus Torvalds 9731ed8516fSDenis V. Lunev net->ipv6.icmp_sk[i] = sk; 9745c8cafd6SDenis V. Lunev 9751da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 9761da177e4SLinus Torvalds * sk_buff struct overhead. 9771da177e4SLinus Torvalds */ 97887fb4b7bSEric Dumazet sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); 9791da177e4SLinus Torvalds } 9801da177e4SLinus Torvalds return 0; 9811da177e4SLinus Torvalds 9821da177e4SLinus Torvalds fail: 9835c8cafd6SDenis V. Lunev for (j = 0; j < i; j++) 9841ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); 98598c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 9861da177e4SLinus Torvalds return err; 9871da177e4SLinus Torvalds } 9881da177e4SLinus Torvalds 98998c6d1b2SDenis V. Lunev static void __net_exit icmpv6_sk_exit(struct net *net) 9901da177e4SLinus Torvalds { 9911da177e4SLinus Torvalds int i; 9921da177e4SLinus Torvalds 9936f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 9941ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); 9951da177e4SLinus Torvalds } 99698c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 99798c6d1b2SDenis V. Lunev } 99898c6d1b2SDenis V. Lunev 9998ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 100098c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 100198c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 100298c6d1b2SDenis V. Lunev }; 100398c6d1b2SDenis V. Lunev 100498c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 100598c6d1b2SDenis V. Lunev { 100698c6d1b2SDenis V. Lunev int err; 100798c6d1b2SDenis V. Lunev 100898c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 100998c6d1b2SDenis V. Lunev if (err < 0) 101098c6d1b2SDenis V. Lunev return err; 101198c6d1b2SDenis V. Lunev 101298c6d1b2SDenis V. Lunev err = -EAGAIN; 101398c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 101498c6d1b2SDenis V. Lunev goto fail; 10155f5624cfSPravin B Shelar 10165f5624cfSPravin B Shelar err = inet6_register_icmp_sender(icmp6_send); 10175f5624cfSPravin B Shelar if (err) 10185f5624cfSPravin B Shelar goto sender_reg_err; 101998c6d1b2SDenis V. Lunev return 0; 102098c6d1b2SDenis V. Lunev 10215f5624cfSPravin B Shelar sender_reg_err: 10225f5624cfSPravin B Shelar inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 102398c6d1b2SDenis V. Lunev fail: 1024f3213831SJoe Perches pr_err("Failed to register ICMP6 protocol\n"); 102598c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 102698c6d1b2SDenis V. Lunev return err; 102798c6d1b2SDenis V. Lunev } 102898c6d1b2SDenis V. Lunev 10298ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 103098c6d1b2SDenis V. Lunev { 10315f5624cfSPravin B Shelar inet6_unregister_icmp_sender(icmp6_send); 103298c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 10331da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 10341da177e4SLinus Torvalds } 10351da177e4SLinus Torvalds 103698c6d1b2SDenis V. Lunev 10379b5b5cffSArjan van de Ven static const struct icmp6_err { 10381da177e4SLinus Torvalds int err; 10391da177e4SLinus Torvalds int fatal; 10401da177e4SLinus Torvalds } tab_unreach[] = { 10411da177e4SLinus Torvalds { /* NOROUTE */ 10421da177e4SLinus Torvalds .err = ENETUNREACH, 10431da177e4SLinus Torvalds .fatal = 0, 10441da177e4SLinus Torvalds }, 10451da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 10461da177e4SLinus Torvalds .err = EACCES, 10471da177e4SLinus Torvalds .fatal = 1, 10481da177e4SLinus Torvalds }, 10491da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 10501da177e4SLinus Torvalds .err = EHOSTUNREACH, 10511da177e4SLinus Torvalds .fatal = 0, 10521da177e4SLinus Torvalds }, 10531da177e4SLinus Torvalds { /* ADDR_UNREACH */ 10541da177e4SLinus Torvalds .err = EHOSTUNREACH, 10551da177e4SLinus Torvalds .fatal = 0, 10561da177e4SLinus Torvalds }, 10571da177e4SLinus Torvalds { /* PORT_UNREACH */ 10581da177e4SLinus Torvalds .err = ECONNREFUSED, 10591da177e4SLinus Torvalds .fatal = 1, 10601da177e4SLinus Torvalds }, 106161e76b17SJiri Bohac { /* POLICY_FAIL */ 106261e76b17SJiri Bohac .err = EACCES, 106361e76b17SJiri Bohac .fatal = 1, 106461e76b17SJiri Bohac }, 106561e76b17SJiri Bohac { /* REJECT_ROUTE */ 106661e76b17SJiri Bohac .err = EACCES, 106761e76b17SJiri Bohac .fatal = 1, 106861e76b17SJiri Bohac }, 10691da177e4SLinus Torvalds }; 10701da177e4SLinus Torvalds 1071d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 10721da177e4SLinus Torvalds { 10731da177e4SLinus Torvalds int fatal = 0; 10741da177e4SLinus Torvalds 10751da177e4SLinus Torvalds *err = EPROTO; 10761da177e4SLinus Torvalds 10771da177e4SLinus Torvalds switch (type) { 10781da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 10791da177e4SLinus Torvalds fatal = 1; 108061e76b17SJiri Bohac if (code < ARRAY_SIZE(tab_unreach)) { 10811da177e4SLinus Torvalds *err = tab_unreach[code].err; 10821da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 10831da177e4SLinus Torvalds } 10841da177e4SLinus Torvalds break; 10851da177e4SLinus Torvalds 10861da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 10871da177e4SLinus Torvalds *err = EMSGSIZE; 10881da177e4SLinus Torvalds break; 10891da177e4SLinus Torvalds 10901da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 10911da177e4SLinus Torvalds *err = EPROTO; 10921da177e4SLinus Torvalds fatal = 1; 10931da177e4SLinus Torvalds break; 10941da177e4SLinus Torvalds 10951da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 10961da177e4SLinus Torvalds *err = EHOSTUNREACH; 10971da177e4SLinus Torvalds break; 10983ff50b79SStephen Hemminger } 10991da177e4SLinus Torvalds 11001da177e4SLinus Torvalds return fatal; 11011da177e4SLinus Torvalds } 11027159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 11037159039aSYOSHIFUJI Hideaki 11041da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 1105e8243534Sstephen hemminger static struct ctl_table ipv6_icmp_table_template[] = { 11061da177e4SLinus Torvalds { 11071da177e4SLinus Torvalds .procname = "ratelimit", 110841a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 11091da177e4SLinus Torvalds .maxlen = sizeof(int), 11101da177e4SLinus Torvalds .mode = 0644, 11116d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 11121da177e4SLinus Torvalds }, 1113f8572d8fSEric W. Biederman { }, 11141da177e4SLinus Torvalds }; 1115760f2d01SDaniel Lezcano 11162c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 1117760f2d01SDaniel Lezcano { 1118760f2d01SDaniel Lezcano struct ctl_table *table; 1119760f2d01SDaniel Lezcano 1120760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 1121760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 1122760f2d01SDaniel Lezcano GFP_KERNEL); 11235ee09105SYOSHIFUJI Hideaki 1124c027aab4SEric W. Biederman if (table) 11255ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 11265ee09105SYOSHIFUJI Hideaki 1127760f2d01SDaniel Lezcano return table; 1128760f2d01SDaniel Lezcano } 11291da177e4SLinus Torvalds #endif 1130