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 4021b70d792SDavid Ahern static int icmp6_iif(const struct sk_buff *skb) 4031b70d792SDavid Ahern { 4041b70d792SDavid Ahern int iif = skb->dev->ifindex; 4051b70d792SDavid Ahern 4061b70d792SDavid Ahern /* for local traffic to local address, skb dev is the loopback 4071b70d792SDavid Ahern * device. Check if there is a dst attached to the skb and if so 4081b70d792SDavid Ahern * get the real device index. 4091b70d792SDavid Ahern */ 4101b70d792SDavid Ahern if (unlikely(iif == LOOPBACK_IFINDEX)) { 4111b70d792SDavid Ahern const struct rt6_info *rt6 = skb_rt6_info(skb); 4121b70d792SDavid Ahern 4131b70d792SDavid Ahern if (rt6) 4141b70d792SDavid Ahern iif = rt6->rt6i_idev->dev->ifindex; 4151b70d792SDavid Ahern } 4161b70d792SDavid Ahern 4171b70d792SDavid Ahern return iif; 4181b70d792SDavid Ahern } 4191b70d792SDavid Ahern 4201da177e4SLinus Torvalds /* 4211da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 4221da177e4SLinus Torvalds */ 423b1cadc1aSEric Dumazet static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info, 424b1cadc1aSEric Dumazet const struct in6_addr *force_saddr) 4251da177e4SLinus Torvalds { 426c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 4271da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 4280660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 42984427d53SYOSHIFUJI Hideaki struct sock *sk; 43084427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 431b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 4321da177e4SLinus Torvalds struct dst_entry *dst; 4331da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 4344c9483b2SDavid S. Miller struct flowi6 fl6; 4351da177e4SLinus Torvalds struct icmpv6_msg msg; 436c14ac945SSoheil Hassas Yeganeh struct sockcm_cookie sockc_unused = {0}; 43726879da5SWei Wang struct ipcm6_cookie ipc6; 4381da177e4SLinus Torvalds int iif = 0; 4391da177e4SLinus Torvalds int addr_type = 0; 4401da177e4SLinus Torvalds int len; 4411da177e4SLinus Torvalds int err = 0; 442e110861fSLorenzo Colitti u32 mark = IP6_REPLY_MARK(net, skb->mark); 4431da177e4SLinus Torvalds 44427a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 44529a3cad5SSimon Horman (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb)) 4461da177e4SLinus Torvalds return; 4471da177e4SLinus Torvalds 4481da177e4SLinus Torvalds /* 4491da177e4SLinus Torvalds * Make sure we respect the rules 4501da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 4515f5624cfSPravin B Shelar * Rule (e.1) is enforced by not using icmp6_send 4521da177e4SLinus Torvalds * in any code that processes icmp errors. 4531da177e4SLinus Torvalds */ 4541da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 4551da177e4SLinus Torvalds 456446fab59SFX Le Bail if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) || 457d94c1f92SFX Le Bail ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr)) 4581da177e4SLinus Torvalds saddr = &hdr->daddr; 4591da177e4SLinus Torvalds 4601da177e4SLinus Torvalds /* 4611da177e4SLinus Torvalds * Dest addr check 4621da177e4SLinus Torvalds */ 4631da177e4SLinus Torvalds 4649a6b4b39Szhuyj if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) { 4651da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 4661da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 4671da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 4681da177e4SLinus Torvalds (opt_unrec(skb, info)))) 4691da177e4SLinus Torvalds return; 4701da177e4SLinus Torvalds 4711da177e4SLinus Torvalds saddr = NULL; 4721da177e4SLinus Torvalds } 4731da177e4SLinus Torvalds 4741da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 4751da177e4SLinus Torvalds 4761da177e4SLinus Torvalds /* 4771da177e4SLinus Torvalds * Source addr check 4781da177e4SLinus Torvalds */ 4791da177e4SLinus Torvalds 4804832c30dSDavid Ahern if (__ipv6_addr_needs_scope_id(addr_type)) { 4811b70d792SDavid Ahern iif = icmp6_iif(skb); 4824832c30dSDavid Ahern } else { 48379dc7e3fSDavid Ahern dst = skb_dst(skb); 48479dc7e3fSDavid Ahern iif = l3mdev_master_ifindex(dst ? dst->dev : skb->dev); 48579dc7e3fSDavid Ahern } 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds /* 4888de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 4898de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 4908de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 4918de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 4921da177e4SLinus Torvalds */ 4931da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 4944b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n", 4954b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 4961da177e4SLinus Torvalds return; 4971da177e4SLinus Torvalds } 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds /* 5001da177e4SLinus Torvalds * Never answer to a ICMP packet. 5011da177e4SLinus Torvalds */ 5021da177e4SLinus Torvalds if (is_ineligible(skb)) { 5034b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n", 5044b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5051da177e4SLinus Torvalds return; 5061da177e4SLinus Torvalds } 5071da177e4SLinus Torvalds 5087ba91ecbSJesper Dangaard Brouer /* Needed by both icmp_global_allow and icmpv6_xmit_lock */ 5097ba91ecbSJesper Dangaard Brouer local_bh_disable(); 5107ba91ecbSJesper Dangaard Brouer 5117ba91ecbSJesper Dangaard Brouer /* Check global sysctl_icmp_msgs_per_sec ratelimit */ 512849a44deSJesper Dangaard Brouer if (!(skb->dev->flags&IFF_LOOPBACK) && !icmpv6_global_allow(type)) 5137ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 5147ba91ecbSJesper Dangaard Brouer 51579383236SMasahide NAKAMURA mip6_addr_swap(skb); 51679383236SMasahide NAKAMURA 5174c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 5184c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 5194e3fd7a0SAlexey Dobriyan fl6.daddr = hdr->saddr; 520b1cadc1aSEric Dumazet if (force_saddr) 521b1cadc1aSEric Dumazet saddr = force_saddr; 5221da177e4SLinus Torvalds if (saddr) 5234e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 524e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 5254c9483b2SDavid S. Miller fl6.flowi6_oif = iif; 5261958b856SDavid S. Miller fl6.fl6_icmp_type = type; 5271958b856SDavid S. Miller fl6.fl6_icmp_code = code; 528e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 52923aebdacSJakub Sitnicki fl6.mp_hash = rt6_multipath_hash(&fl6, skb); 5304c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 5311da177e4SLinus Torvalds 532fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 53363159f29SIan Morris if (!sk) 5347ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 535c0303efeSJesper Dangaard Brouer 536e110861fSLorenzo Colitti sk->sk_mark = mark; 537fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 538405666dbSDenis V. Lunev 5394c9483b2SDavid S. Miller if (!icmpv6_xrlim_allow(sk, type, &fl6)) 5401da177e4SLinus Torvalds goto out; 5411da177e4SLinus Torvalds 5421da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 5431da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 5441da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 5451da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 5461da177e4SLinus Torvalds 5474c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 5484c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 549c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 550c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 5511da177e4SLinus Torvalds 55238b7097bSHannes Frederic Sowa ipc6.tclass = np->tclass; 55338b7097bSHannes Frederic Sowa fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 55438b7097bSHannes Frederic Sowa 5554c9483b2SDavid S. Miller dst = icmpv6_route_lookup(net, skb, sk, &fl6); 556b42835dbSDavid S. Miller if (IS_ERR(dst)) 5571da177e4SLinus Torvalds goto out; 5588de3351eSYOSHIFUJI Hideaki 55926879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 56026879da5SWei Wang ipc6.dontfrag = np->dontfrag; 56126879da5SWei Wang ipc6.opt = NULL; 5621da177e4SLinus Torvalds 5631da177e4SLinus Torvalds msg.skb = skb; 564bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 565763ecff1SYasuyuki Kozakai msg.type = type; 5661da177e4SLinus Torvalds 5671da177e4SLinus Torvalds len = skb->len - msg.offset; 5681da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); 5691da177e4SLinus Torvalds if (len < 0) { 5704b3418fbSBjørn Mork net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n", 5714b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5721da177e4SLinus Torvalds goto out_dst_release; 5731da177e4SLinus Torvalds } 5741da177e4SLinus Torvalds 575cfdf7647SEric Dumazet rcu_read_lock(); 576cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 5771da177e4SLinus Torvalds 5781da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, 5791da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 58026879da5SWei Wang sizeof(struct icmp6hdr), 58126879da5SWei Wang &ipc6, &fl6, (struct rt6_info *)dst, 58226879da5SWei Wang MSG_DONTWAIT, &sockc_unused); 5831da177e4SLinus Torvalds if (err) { 58443a43b60SHannes Frederic Sowa ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 5851da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 586cfdf7647SEric Dumazet } else { 587cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 588cfdf7647SEric Dumazet len + sizeof(struct icmp6hdr)); 5891da177e4SLinus Torvalds } 590cfdf7647SEric Dumazet rcu_read_unlock(); 5911da177e4SLinus Torvalds out_dst_release: 5921da177e4SLinus Torvalds dst_release(dst); 5931da177e4SLinus Torvalds out: 594405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5957ba91ecbSJesper Dangaard Brouer out_bh_enable: 5967ba91ecbSJesper Dangaard Brouer local_bh_enable(); 5971da177e4SLinus Torvalds } 5985f5624cfSPravin B Shelar 5995f5624cfSPravin B Shelar /* Slightly more convenient version of icmp6_send. 6005f5624cfSPravin B Shelar */ 6015f5624cfSPravin B Shelar void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) 6025f5624cfSPravin B Shelar { 603b1cadc1aSEric Dumazet icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL); 6045f5624cfSPravin B Shelar kfree_skb(skb); 6055f5624cfSPravin B Shelar } 6067159039aSYOSHIFUJI Hideaki 6075fbba8acSEric Dumazet /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH 6085fbba8acSEric Dumazet * if sufficient data bytes are available 6095fbba8acSEric Dumazet * @nhs is the size of the tunnel header(s) : 6105fbba8acSEric Dumazet * Either an IPv4 header for SIT encap 6115fbba8acSEric Dumazet * an IPv4 header + GRE header for GRE encap 6125fbba8acSEric Dumazet */ 61320e1954fSEric Dumazet int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type, 61420e1954fSEric Dumazet unsigned int data_len) 6155fbba8acSEric Dumazet { 6162d7a3b27SEric Dumazet struct in6_addr temp_saddr; 6175fbba8acSEric Dumazet struct rt6_info *rt; 6185fbba8acSEric Dumazet struct sk_buff *skb2; 61920e1954fSEric Dumazet u32 info = 0; 6205fbba8acSEric Dumazet 6215fbba8acSEric Dumazet if (!pskb_may_pull(skb, nhs + sizeof(struct ipv6hdr) + 8)) 6225fbba8acSEric Dumazet return 1; 6235fbba8acSEric Dumazet 62420e1954fSEric Dumazet /* RFC 4884 (partial) support for ICMP extensions */ 62520e1954fSEric Dumazet if (data_len < 128 || (data_len & 7) || skb->len < data_len) 62620e1954fSEric Dumazet data_len = 0; 62720e1954fSEric Dumazet 62820e1954fSEric Dumazet skb2 = data_len ? skb_copy(skb, GFP_ATOMIC) : skb_clone(skb, GFP_ATOMIC); 6295fbba8acSEric Dumazet 6305fbba8acSEric Dumazet if (!skb2) 6315fbba8acSEric Dumazet return 1; 6325fbba8acSEric Dumazet 6335fbba8acSEric Dumazet skb_dst_drop(skb2); 6345fbba8acSEric Dumazet skb_pull(skb2, nhs); 6355fbba8acSEric Dumazet skb_reset_network_header(skb2); 6365fbba8acSEric Dumazet 6375fbba8acSEric Dumazet rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 0); 6385fbba8acSEric Dumazet 6395fbba8acSEric Dumazet if (rt && rt->dst.dev) 6405fbba8acSEric Dumazet skb2->dev = rt->dst.dev; 6415fbba8acSEric Dumazet 6422d7a3b27SEric Dumazet ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr); 64320e1954fSEric Dumazet 64420e1954fSEric Dumazet if (data_len) { 64520e1954fSEric Dumazet /* RFC 4884 (partial) support : 64620e1954fSEric Dumazet * insert 0 padding at the end, before the extensions 64720e1954fSEric Dumazet */ 64820e1954fSEric Dumazet __skb_push(skb2, nhs); 64920e1954fSEric Dumazet skb_reset_network_header(skb2); 65020e1954fSEric Dumazet memmove(skb2->data, skb2->data + nhs, data_len - nhs); 65120e1954fSEric Dumazet memset(skb2->data + data_len - nhs, 0, nhs); 65220e1954fSEric Dumazet /* RFC 4884 4.5 : Length is measured in 64-bit words, 65320e1954fSEric Dumazet * and stored in reserved[0] 65420e1954fSEric Dumazet */ 65520e1954fSEric Dumazet info = (data_len/8) << 24; 65620e1954fSEric Dumazet } 6572d7a3b27SEric Dumazet if (type == ICMP_TIME_EXCEEDED) 6582d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 65920e1954fSEric Dumazet info, &temp_saddr); 6602d7a3b27SEric Dumazet else 6612d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 66220e1954fSEric Dumazet info, &temp_saddr); 6635fbba8acSEric Dumazet if (rt) 6645fbba8acSEric Dumazet ip6_rt_put(rt); 6655fbba8acSEric Dumazet 6665fbba8acSEric Dumazet kfree_skb(skb2); 6675fbba8acSEric Dumazet 6685fbba8acSEric Dumazet return 0; 6695fbba8acSEric Dumazet } 6705fbba8acSEric Dumazet EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach); 6715fbba8acSEric Dumazet 6721da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 6731da177e4SLinus Torvalds { 674c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 67584427d53SYOSHIFUJI Hideaki struct sock *sk; 6761da177e4SLinus Torvalds struct inet6_dev *idev; 67784427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 678b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 679cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 6801da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 6814c9483b2SDavid S. Miller struct flowi6 fl6; 6821da177e4SLinus Torvalds struct icmpv6_msg msg; 6831da177e4SLinus Torvalds struct dst_entry *dst; 68426879da5SWei Wang struct ipcm6_cookie ipc6; 6851da177e4SLinus Torvalds int err = 0; 686e110861fSLorenzo Colitti u32 mark = IP6_REPLY_MARK(net, skb->mark); 687c14ac945SSoheil Hassas Yeganeh struct sockcm_cookie sockc_unused = {0}; 6881da177e4SLinus Torvalds 6890660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 6901da177e4SLinus Torvalds 691509aba3bSFX Le Bail if (!ipv6_unicast_destination(skb) && 692ec35b61eSFX Le Bail !(net->ipv6.sysctl.anycast_src_echo_reply && 6932647a9b0SMartin KaFai Lau ipv6_anycast_destination(skb_dst(skb), saddr))) 6941da177e4SLinus Torvalds saddr = NULL; 6951da177e4SLinus Torvalds 6961da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 6971da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 6981da177e4SLinus Torvalds 6994c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 7004c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 7014e3fd7a0SAlexey Dobriyan fl6.daddr = ipv6_hdr(skb)->saddr; 7021da177e4SLinus Torvalds if (saddr) 7034e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 7041b70d792SDavid Ahern fl6.flowi6_oif = icmp6_iif(skb); 7051958b856SDavid S. Miller fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; 706e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 707e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 7084c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 7091da177e4SLinus Torvalds 7107ba91ecbSJesper Dangaard Brouer local_bh_disable(); 711fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 71263159f29SIan Morris if (!sk) 7137ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 714e110861fSLorenzo Colitti sk->sk_mark = mark; 715fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 716405666dbSDenis V. Lunev 7174c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 7184c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 719c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 720c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 7211da177e4SLinus Torvalds 722343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst, &fl6); 7231da177e4SLinus Torvalds if (err) 7241da177e4SLinus Torvalds goto out; 7254c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); 726452edd59SDavid S. Miller if (IS_ERR(dst)) 727e104411bSPatrick McHardy goto out; 7281da177e4SLinus Torvalds 729cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 7301da177e4SLinus Torvalds 7311da177e4SLinus Torvalds msg.skb = skb; 7321da177e4SLinus Torvalds msg.offset = 0; 733763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 7341da177e4SLinus Torvalds 73526879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 73626879da5SWei Wang ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 73726879da5SWei Wang ipc6.dontfrag = np->dontfrag; 73826879da5SWei Wang ipc6.opt = NULL; 73926879da5SWei Wang 7401da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 74126879da5SWei Wang sizeof(struct icmp6hdr), &ipc6, &fl6, 74213b52cd4SBrian Haley (struct rt6_info *)dst, MSG_DONTWAIT, 74326879da5SWei Wang &sockc_unused); 7441da177e4SLinus Torvalds 7451da177e4SLinus Torvalds if (err) { 746a16292a0SEric Dumazet __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 7471da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 748cfdf7647SEric Dumazet } else { 749cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 750cfdf7647SEric Dumazet skb->len + sizeof(struct icmp6hdr)); 7511da177e4SLinus Torvalds } 7521da177e4SLinus Torvalds dst_release(dst); 7531da177e4SLinus Torvalds out: 754405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 7557ba91ecbSJesper Dangaard Brouer out_bh_enable: 7567ba91ecbSJesper Dangaard Brouer local_bh_enable(); 7571da177e4SLinus Torvalds } 7581da177e4SLinus Torvalds 759b94f1c09SDavid S. Miller void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 7601da177e4SLinus Torvalds { 76141135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 7621da177e4SLinus Torvalds int inner_offset; 76375f2811cSJesse Gross __be16 frag_off; 764f9242b6bSDavid S. Miller u8 nexthdr; 7657304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 7661da177e4SLinus Torvalds 7671da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 7687304fe46SDuan Jiong goto out; 7691da177e4SLinus Torvalds 7701da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 7711da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 7721da177e4SLinus Torvalds /* now skip over extension headers */ 77375f2811cSJesse Gross inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 77475f2811cSJesse Gross &nexthdr, &frag_off); 7751da177e4SLinus Torvalds if (inner_offset < 0) 7767304fe46SDuan Jiong goto out; 7771da177e4SLinus Torvalds } else { 7781da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 7791da177e4SLinus Torvalds } 7801da177e4SLinus Torvalds 7811da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 7821da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 7837304fe46SDuan Jiong goto out; 7841da177e4SLinus Torvalds 7851da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 7861da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 7871da177e4SLinus Torvalds pmtu discovery. 7881da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 7891da177e4SLinus Torvalds --ANK (980726) 7901da177e4SLinus Torvalds */ 7911da177e4SLinus Torvalds 792f9242b6bSDavid S. Miller ipprot = rcu_dereference(inet6_protos[nexthdr]); 7931da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 7941da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 7951da177e4SLinus Torvalds 79669d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 7977304fe46SDuan Jiong return; 7987304fe46SDuan Jiong 7997304fe46SDuan Jiong out: 800a16292a0SEric Dumazet __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); 8011da177e4SLinus Torvalds } 8021da177e4SLinus Torvalds 8031da177e4SLinus Torvalds /* 8041da177e4SLinus Torvalds * Handle icmp messages 8051da177e4SLinus Torvalds */ 8061da177e4SLinus Torvalds 807e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 8081da177e4SLinus Torvalds { 8091da177e4SLinus Torvalds struct net_device *dev = skb->dev; 8101da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 811b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 8121da177e4SLinus Torvalds struct icmp6hdr *hdr; 813d5fdd6baSBrian Haley u8 type; 814e3e32170SRick Jones bool success = false; 8151da177e4SLinus Torvalds 816aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 817def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 8188b7817f3SHerbert Xu int nh; 8198b7817f3SHerbert Xu 820def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 821aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 822aebcf82cSHerbert Xu goto drop_no_count; 823aebcf82cSHerbert Xu 82481aded24SDavid S. Miller if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) 8258b7817f3SHerbert Xu goto drop_no_count; 8268b7817f3SHerbert Xu 8278b7817f3SHerbert Xu nh = skb_network_offset(skb); 8288b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 8298b7817f3SHerbert Xu 8308b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 8318b7817f3SHerbert Xu goto drop_no_count; 8328b7817f3SHerbert Xu 8338b7817f3SHerbert Xu skb_set_network_header(skb, nh); 8348b7817f3SHerbert Xu } 8358b7817f3SHerbert Xu 836a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS); 8371da177e4SLinus Torvalds 8380660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 8390660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 8401da177e4SLinus Torvalds 84139471ac8STom Herbert if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { 842ba7a46f1SJoe Perches net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", 8430c6ce78aSHarvey Harrison saddr, daddr); 8446a5dc9e5SEric Dumazet goto csum_error; 8451da177e4SLinus Torvalds } 8461da177e4SLinus Torvalds 8478cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 8488cf22943SHerbert Xu goto discard_it; 8491da177e4SLinus Torvalds 850cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 8511da177e4SLinus Torvalds 8521da177e4SLinus Torvalds type = hdr->icmp6_type; 8531da177e4SLinus Torvalds 854f3832ed2SEric Dumazet ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type); 8551da177e4SLinus Torvalds 8561da177e4SLinus Torvalds switch (type) { 8571da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 8581da177e4SLinus Torvalds icmpv6_echo_reply(skb); 8591da177e4SLinus Torvalds break; 8601da177e4SLinus Torvalds 8611da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 862e3e32170SRick Jones success = ping_rcv(skb); 8631da177e4SLinus Torvalds break; 8641da177e4SLinus Torvalds 8651da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 8661da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 8671da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 8681da177e4SLinus Torvalds destination cache will allow to solve this problem 8691da177e4SLinus Torvalds --ANK (980726) 8701da177e4SLinus Torvalds */ 8711da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 8721da177e4SLinus Torvalds goto discard_it; 873cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 8741da177e4SLinus Torvalds 8751da177e4SLinus Torvalds /* 8761da177e4SLinus Torvalds * Drop through to notify 8771da177e4SLinus Torvalds */ 8781da177e4SLinus Torvalds 8791da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 8801da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 8811da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 8821da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 8831da177e4SLinus Torvalds break; 8841da177e4SLinus Torvalds 8851da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 8861da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 8871da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 8881da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 8891da177e4SLinus Torvalds case NDISC_REDIRECT: 8901da177e4SLinus Torvalds ndisc_rcv(skb); 8911da177e4SLinus Torvalds break; 8921da177e4SLinus Torvalds 8931da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 8941da177e4SLinus Torvalds igmp6_event_query(skb); 8951da177e4SLinus Torvalds break; 8961da177e4SLinus Torvalds 8971da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 8981da177e4SLinus Torvalds igmp6_event_report(skb); 8991da177e4SLinus Torvalds break; 9001da177e4SLinus Torvalds 9011da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 9021da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 9031da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 9041da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 9051da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 9061da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 9071da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 9081da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 9091da177e4SLinus Torvalds break; 9101da177e4SLinus Torvalds 9111da177e4SLinus Torvalds default: 9121da177e4SLinus Torvalds /* informational */ 9131da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 9141da177e4SLinus Torvalds break; 9151da177e4SLinus Torvalds 9164b3418fbSBjørn Mork net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n", 9174b3418fbSBjørn Mork saddr, daddr); 918ea85a0a2SDavid S. Miller 9191da177e4SLinus Torvalds /* 9201da177e4SLinus Torvalds * error of unknown type. 9211da177e4SLinus Torvalds * must pass to upper level 9221da177e4SLinus Torvalds */ 9231da177e4SLinus Torvalds 9241da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 9253ff50b79SStephen Hemminger } 9263ff50b79SStephen Hemminger 927e3e32170SRick Jones /* until the v6 path can be better sorted assume failure and 928e3e32170SRick Jones * preserve the status quo behaviour for the rest of the paths to here 929e3e32170SRick Jones */ 930e3e32170SRick Jones if (success) 931e3e32170SRick Jones consume_skb(skb); 932e3e32170SRick Jones else 9331da177e4SLinus Torvalds kfree_skb(skb); 934e3e32170SRick Jones 9351da177e4SLinus Torvalds return 0; 9361da177e4SLinus Torvalds 9376a5dc9e5SEric Dumazet csum_error: 938a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); 9391da177e4SLinus Torvalds discard_it: 940a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS); 9418b7817f3SHerbert Xu drop_no_count: 9421da177e4SLinus Torvalds kfree_skb(skb); 9431da177e4SLinus Torvalds return 0; 9441da177e4SLinus Torvalds } 9451da177e4SLinus Torvalds 9464c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, 94795e41e93SYOSHIFUJI Hideaki u8 type, 94895e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 94995e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 95095e41e93SYOSHIFUJI Hideaki int oif) 95195e41e93SYOSHIFUJI Hideaki { 9524c9483b2SDavid S. Miller memset(fl6, 0, sizeof(*fl6)); 9534e3fd7a0SAlexey Dobriyan fl6->saddr = *saddr; 9544e3fd7a0SAlexey Dobriyan fl6->daddr = *daddr; 9554c9483b2SDavid S. Miller fl6->flowi6_proto = IPPROTO_ICMPV6; 9561958b856SDavid S. Miller fl6->fl6_icmp_type = type; 9571958b856SDavid S. Miller fl6->fl6_icmp_code = 0; 9584c9483b2SDavid S. Miller fl6->flowi6_oif = oif; 9594c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); 96095e41e93SYOSHIFUJI Hideaki } 96195e41e93SYOSHIFUJI Hideaki 96298c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 9631da177e4SLinus Torvalds { 9641da177e4SLinus Torvalds struct sock *sk; 9651da177e4SLinus Torvalds int err, i, j; 9661da177e4SLinus Torvalds 96798c6d1b2SDenis V. Lunev net->ipv6.icmp_sk = 96898c6d1b2SDenis V. Lunev kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); 96963159f29SIan Morris if (!net->ipv6.icmp_sk) 97079c91159SDenis V. Lunev return -ENOMEM; 97179c91159SDenis V. Lunev 9726f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 9731ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 9741ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 9751da177e4SLinus Torvalds if (err < 0) { 976f3213831SJoe Perches pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", 9771da177e4SLinus Torvalds err); 9781da177e4SLinus Torvalds goto fail; 9791da177e4SLinus Torvalds } 9801da177e4SLinus Torvalds 9811ed8516fSDenis V. Lunev net->ipv6.icmp_sk[i] = sk; 9825c8cafd6SDenis V. Lunev 9831da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 9841da177e4SLinus Torvalds * sk_buff struct overhead. 9851da177e4SLinus Torvalds */ 98687fb4b7bSEric Dumazet sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); 9871da177e4SLinus Torvalds } 9881da177e4SLinus Torvalds return 0; 9891da177e4SLinus Torvalds 9901da177e4SLinus Torvalds fail: 9915c8cafd6SDenis V. Lunev for (j = 0; j < i; j++) 9921ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); 99398c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 9941da177e4SLinus Torvalds return err; 9951da177e4SLinus Torvalds } 9961da177e4SLinus Torvalds 99798c6d1b2SDenis V. Lunev static void __net_exit icmpv6_sk_exit(struct net *net) 9981da177e4SLinus Torvalds { 9991da177e4SLinus Torvalds int i; 10001da177e4SLinus Torvalds 10016f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 10021ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); 10031da177e4SLinus Torvalds } 100498c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 100598c6d1b2SDenis V. Lunev } 100698c6d1b2SDenis V. Lunev 10078ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 100898c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 100998c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 101098c6d1b2SDenis V. Lunev }; 101198c6d1b2SDenis V. Lunev 101298c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 101398c6d1b2SDenis V. Lunev { 101498c6d1b2SDenis V. Lunev int err; 101598c6d1b2SDenis V. Lunev 101698c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 101798c6d1b2SDenis V. Lunev if (err < 0) 101898c6d1b2SDenis V. Lunev return err; 101998c6d1b2SDenis V. Lunev 102098c6d1b2SDenis V. Lunev err = -EAGAIN; 102198c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 102298c6d1b2SDenis V. Lunev goto fail; 10235f5624cfSPravin B Shelar 10245f5624cfSPravin B Shelar err = inet6_register_icmp_sender(icmp6_send); 10255f5624cfSPravin B Shelar if (err) 10265f5624cfSPravin B Shelar goto sender_reg_err; 102798c6d1b2SDenis V. Lunev return 0; 102898c6d1b2SDenis V. Lunev 10295f5624cfSPravin B Shelar sender_reg_err: 10305f5624cfSPravin B Shelar inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 103198c6d1b2SDenis V. Lunev fail: 1032f3213831SJoe Perches pr_err("Failed to register ICMP6 protocol\n"); 103398c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 103498c6d1b2SDenis V. Lunev return err; 103598c6d1b2SDenis V. Lunev } 103698c6d1b2SDenis V. Lunev 10378ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 103898c6d1b2SDenis V. Lunev { 10395f5624cfSPravin B Shelar inet6_unregister_icmp_sender(icmp6_send); 104098c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 10411da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 10421da177e4SLinus Torvalds } 10431da177e4SLinus Torvalds 104498c6d1b2SDenis V. Lunev 10459b5b5cffSArjan van de Ven static const struct icmp6_err { 10461da177e4SLinus Torvalds int err; 10471da177e4SLinus Torvalds int fatal; 10481da177e4SLinus Torvalds } tab_unreach[] = { 10491da177e4SLinus Torvalds { /* NOROUTE */ 10501da177e4SLinus Torvalds .err = ENETUNREACH, 10511da177e4SLinus Torvalds .fatal = 0, 10521da177e4SLinus Torvalds }, 10531da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 10541da177e4SLinus Torvalds .err = EACCES, 10551da177e4SLinus Torvalds .fatal = 1, 10561da177e4SLinus Torvalds }, 10571da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 10581da177e4SLinus Torvalds .err = EHOSTUNREACH, 10591da177e4SLinus Torvalds .fatal = 0, 10601da177e4SLinus Torvalds }, 10611da177e4SLinus Torvalds { /* ADDR_UNREACH */ 10621da177e4SLinus Torvalds .err = EHOSTUNREACH, 10631da177e4SLinus Torvalds .fatal = 0, 10641da177e4SLinus Torvalds }, 10651da177e4SLinus Torvalds { /* PORT_UNREACH */ 10661da177e4SLinus Torvalds .err = ECONNREFUSED, 10671da177e4SLinus Torvalds .fatal = 1, 10681da177e4SLinus Torvalds }, 106961e76b17SJiri Bohac { /* POLICY_FAIL */ 107061e76b17SJiri Bohac .err = EACCES, 107161e76b17SJiri Bohac .fatal = 1, 107261e76b17SJiri Bohac }, 107361e76b17SJiri Bohac { /* REJECT_ROUTE */ 107461e76b17SJiri Bohac .err = EACCES, 107561e76b17SJiri Bohac .fatal = 1, 107661e76b17SJiri Bohac }, 10771da177e4SLinus Torvalds }; 10781da177e4SLinus Torvalds 1079d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 10801da177e4SLinus Torvalds { 10811da177e4SLinus Torvalds int fatal = 0; 10821da177e4SLinus Torvalds 10831da177e4SLinus Torvalds *err = EPROTO; 10841da177e4SLinus Torvalds 10851da177e4SLinus Torvalds switch (type) { 10861da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 10871da177e4SLinus Torvalds fatal = 1; 108861e76b17SJiri Bohac if (code < ARRAY_SIZE(tab_unreach)) { 10891da177e4SLinus Torvalds *err = tab_unreach[code].err; 10901da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 10911da177e4SLinus Torvalds } 10921da177e4SLinus Torvalds break; 10931da177e4SLinus Torvalds 10941da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 10951da177e4SLinus Torvalds *err = EMSGSIZE; 10961da177e4SLinus Torvalds break; 10971da177e4SLinus Torvalds 10981da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 10991da177e4SLinus Torvalds *err = EPROTO; 11001da177e4SLinus Torvalds fatal = 1; 11011da177e4SLinus Torvalds break; 11021da177e4SLinus Torvalds 11031da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 11041da177e4SLinus Torvalds *err = EHOSTUNREACH; 11051da177e4SLinus Torvalds break; 11063ff50b79SStephen Hemminger } 11071da177e4SLinus Torvalds 11081da177e4SLinus Torvalds return fatal; 11091da177e4SLinus Torvalds } 11107159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 11117159039aSYOSHIFUJI Hideaki 11121da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 1113e8243534Sstephen hemminger static struct ctl_table ipv6_icmp_table_template[] = { 11141da177e4SLinus Torvalds { 11151da177e4SLinus Torvalds .procname = "ratelimit", 111641a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 11171da177e4SLinus Torvalds .maxlen = sizeof(int), 11181da177e4SLinus Torvalds .mode = 0644, 11196d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 11201da177e4SLinus Torvalds }, 1121f8572d8fSEric W. Biederman { }, 11221da177e4SLinus Torvalds }; 1123760f2d01SDaniel Lezcano 11242c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 1125760f2d01SDaniel Lezcano { 1126760f2d01SDaniel Lezcano struct ctl_table *table; 1127760f2d01SDaniel Lezcano 1128760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 1129760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 1130760f2d01SDaniel Lezcano GFP_KERNEL); 11315ee09105SYOSHIFUJI Hideaki 1132c027aab4SEric W. Biederman if (table) 11335ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 11345ee09105SYOSHIFUJI Hideaki 1135760f2d01SDaniel Lezcano return table; 1136760f2d01SDaniel Lezcano } 11371da177e4SLinus Torvalds #endif 1138