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 { 8475efc250SKefeng Wang return *this_cpu_ptr(net->ipv6.icmp_sk); 8598c6d1b2SDenis V. Lunev } 861da177e4SLinus Torvalds 8732bbd879SStefano Brivio static int 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) 955f379ef5SGeorg Kohmann ip6_update_pmtu(skb, net, info, skb->dev->ifindex, 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)); 10332bbd879SStefano Brivio 10432bbd879SStefano Brivio return 0; 1056f809da2SSteffen Klassert } 1066f809da2SSteffen Klassert 107e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb); 1081da177e4SLinus Torvalds 10941135cc8SAlexey Dobriyan static const struct inet6_protocol icmpv6_protocol = { 1101da177e4SLinus Torvalds .handler = icmpv6_rcv, 1116f809da2SSteffen Klassert .err_handler = icmpv6_err, 1128b7817f3SHerbert Xu .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1131da177e4SLinus Torvalds }; 1141da177e4SLinus Torvalds 1157ba91ecbSJesper Dangaard Brouer /* Called with BH disabled */ 116fdc0bde9SDenis V. Lunev static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) 1171da177e4SLinus Torvalds { 118fdc0bde9SDenis V. Lunev struct sock *sk; 119fdc0bde9SDenis V. Lunev 120fdc0bde9SDenis V. Lunev sk = icmpv6_sk(net); 121405666dbSDenis V. Lunev if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { 1221da177e4SLinus Torvalds /* This can happen if the output path (f.e. SIT or 1231da177e4SLinus Torvalds * ip6ip6 tunnel) signals dst_link_failure() for an 1241da177e4SLinus Torvalds * outgoing ICMP6 packet. 1251da177e4SLinus Torvalds */ 126fdc0bde9SDenis V. Lunev return NULL; 1271da177e4SLinus Torvalds } 128fdc0bde9SDenis V. Lunev return sk; 1291da177e4SLinus Torvalds } 1301da177e4SLinus Torvalds 131405666dbSDenis V. Lunev static __inline__ void icmpv6_xmit_unlock(struct sock *sk) 1321da177e4SLinus Torvalds { 1337ba91ecbSJesper Dangaard Brouer spin_unlock(&sk->sk_lock.slock); 1341da177e4SLinus Torvalds } 1351da177e4SLinus Torvalds 1361da177e4SLinus Torvalds /* 1371da177e4SLinus Torvalds * Figure out, may we reply to this packet with icmp error. 1381da177e4SLinus Torvalds * 1391da177e4SLinus Torvalds * We do not reply, if: 1401da177e4SLinus Torvalds * - it was icmp error message. 1411da177e4SLinus Torvalds * - it is truncated, so that it is known, that protocol is ICMPV6 1421da177e4SLinus Torvalds * (i.e. in the middle of some exthdr) 1431da177e4SLinus Torvalds * 1441da177e4SLinus Torvalds * --ANK (980726) 1451da177e4SLinus Torvalds */ 1461da177e4SLinus Torvalds 147a50feda5SEric Dumazet static bool is_ineligible(const struct sk_buff *skb) 1481da177e4SLinus Torvalds { 1490660e03fSArnaldo Carvalho de Melo int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; 1501da177e4SLinus Torvalds int len = skb->len - ptr; 1510660e03fSArnaldo Carvalho de Melo __u8 nexthdr = ipv6_hdr(skb)->nexthdr; 15275f2811cSJesse Gross __be16 frag_off; 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds if (len < 0) 155a50feda5SEric Dumazet return true; 1561da177e4SLinus Torvalds 15775f2811cSJesse Gross ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off); 1581da177e4SLinus Torvalds if (ptr < 0) 159a50feda5SEric Dumazet return false; 1601da177e4SLinus Torvalds if (nexthdr == IPPROTO_ICMPV6) { 1611da177e4SLinus Torvalds u8 _type, *tp; 1621da177e4SLinus Torvalds tp = skb_header_pointer(skb, 1631da177e4SLinus Torvalds ptr+offsetof(struct icmp6hdr, icmp6_type), 1641da177e4SLinus Torvalds sizeof(_type), &_type); 16563159f29SIan Morris if (!tp || !(*tp & ICMPV6_INFOMSG_MASK)) 166a50feda5SEric Dumazet return true; 1671da177e4SLinus Torvalds } 168a50feda5SEric Dumazet return false; 1691da177e4SLinus Torvalds } 1701da177e4SLinus Torvalds 1710bc19985SStephen Suryaputra static bool icmpv6_mask_allow(struct net *net, int type) 172c0303efeSJesper Dangaard Brouer { 1730bc19985SStephen Suryaputra if (type > ICMPV6_MSG_MAX) 174c0303efeSJesper Dangaard Brouer return true; 175c0303efeSJesper Dangaard Brouer 1760bc19985SStephen Suryaputra /* Limit if icmp type is set in ratemask. */ 1770bc19985SStephen Suryaputra if (!test_bit(type, net->ipv6.sysctl.icmpv6_ratemask)) 178c0303efeSJesper Dangaard Brouer return true; 179c0303efeSJesper Dangaard Brouer 180c0303efeSJesper Dangaard Brouer return false; 181c0303efeSJesper Dangaard Brouer } 182c0303efeSJesper Dangaard Brouer 1830bc19985SStephen Suryaputra static bool icmpv6_global_allow(struct net *net, int type) 184c0303efeSJesper Dangaard Brouer { 1850bc19985SStephen Suryaputra if (icmpv6_mask_allow(net, type)) 186c0303efeSJesper Dangaard Brouer return true; 187c0303efeSJesper Dangaard Brouer 188c0303efeSJesper Dangaard Brouer if (icmp_global_allow()) 189c0303efeSJesper Dangaard Brouer return true; 190c0303efeSJesper Dangaard Brouer 191c0303efeSJesper Dangaard Brouer return false; 192c0303efeSJesper Dangaard Brouer } 193c0303efeSJesper Dangaard Brouer 1941da177e4SLinus Torvalds /* 1951da177e4SLinus Torvalds * Check the ICMP output rate limit 1961da177e4SLinus Torvalds */ 1974cdf507dSEric Dumazet static bool icmpv6_xrlim_allow(struct sock *sk, u8 type, 1984c9483b2SDavid S. Miller struct flowi6 *fl6) 1991da177e4SLinus Torvalds { 2003b1e0a65SYOSHIFUJI Hideaki struct net *net = sock_net(sk); 2014cdf507dSEric Dumazet struct dst_entry *dst; 20292d86829SDavid S. Miller bool res = false; 2031da177e4SLinus Torvalds 2040bc19985SStephen Suryaputra if (icmpv6_mask_allow(net, type)) 20592d86829SDavid S. Miller return true; 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds /* 2081da177e4SLinus Torvalds * Look up the output route. 2091da177e4SLinus Torvalds * XXX: perhaps the expire for routing entries cloned by 2101da177e4SLinus Torvalds * this lookup should be more aggressive (not longer than timeout). 2111da177e4SLinus Torvalds */ 2124c9483b2SDavid S. Miller dst = ip6_route_output(net, sk, fl6); 2131da177e4SLinus Torvalds if (dst->error) { 2143bd653c8SDenis V. Lunev IP6_INC_STATS(net, ip6_dst_idev(dst), 215a11d206dSYOSHIFUJI Hideaki IPSTATS_MIB_OUTNOROUTES); 2161da177e4SLinus Torvalds } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { 21792d86829SDavid S. Miller res = true; 2181da177e4SLinus Torvalds } else { 2191da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 2209a43b709SBenjamin Thery int tmo = net->ipv6.sysctl.icmpv6_time; 221c0303efeSJesper Dangaard Brouer struct inet_peer *peer; 2221da177e4SLinus Torvalds 2231da177e4SLinus Torvalds /* Give more bandwidth to wider prefixes. */ 2241da177e4SLinus Torvalds if (rt->rt6i_dst.plen < 128) 2251da177e4SLinus Torvalds tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 2261da177e4SLinus Torvalds 227c0303efeSJesper Dangaard Brouer peer = inet_getpeer_v6(net->ipv6.peers, &fl6->daddr, 1); 228fbfe95a4SDavid S. Miller res = inet_peer_xrlim_allow(peer, tmo); 2291d861aa4SDavid S. Miller if (peer) 2301d861aa4SDavid S. Miller inet_putpeer(peer); 2311da177e4SLinus Torvalds } 2321da177e4SLinus Torvalds dst_release(dst); 2331da177e4SLinus Torvalds return res; 2341da177e4SLinus Torvalds } 2351da177e4SLinus Torvalds 2361da177e4SLinus Torvalds /* 2371da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2381da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2391da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2401da177e4SLinus Torvalds * highest-order two bits set to 10 2411da177e4SLinus Torvalds */ 2421da177e4SLinus Torvalds 243a50feda5SEric Dumazet static bool opt_unrec(struct sk_buff *skb, __u32 offset) 2441da177e4SLinus Torvalds { 2451da177e4SLinus Torvalds u8 _optval, *op; 2461da177e4SLinus Torvalds 247bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2481da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 24963159f29SIan Morris if (!op) 250a50feda5SEric Dumazet return true; 2511da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2521da177e4SLinus Torvalds } 2531da177e4SLinus Torvalds 2544e64b1edSJoe Perches void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 2556d0bfe22SLorenzo Colitti struct icmp6hdr *thdr, int len) 2561da177e4SLinus Torvalds { 2571da177e4SLinus Torvalds struct sk_buff *skb; 2581da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2591da177e4SLinus Torvalds 260e5d08d71SIan Morris skb = skb_peek(&sk->sk_write_queue); 26163159f29SIan Morris if (!skb) 2624e64b1edSJoe Perches return; 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 } 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvalds struct icmpv6_msg { 2931da177e4SLinus Torvalds struct sk_buff *skb; 2941da177e4SLinus Torvalds int offset; 295763ecff1SYasuyuki Kozakai uint8_t type; 2961da177e4SLinus Torvalds }; 2971da177e4SLinus Torvalds 2981da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 2991da177e4SLinus Torvalds { 3001da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 3011da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 3025f92a738SAl Viro __wsum csum = 0; 3031da177e4SLinus Torvalds 3041da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 3051da177e4SLinus Torvalds to, len, csum); 3061da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 307763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 308763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 3091da177e4SLinus Torvalds return 0; 3101da177e4SLinus Torvalds } 3111da177e4SLinus Torvalds 31207a93626SAmerigo Wang #if IS_ENABLED(CONFIG_IPV6_MIP6) 31379383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 31479383236SMasahide NAKAMURA { 3150660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 31679383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 31779383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 31879383236SMasahide NAKAMURA struct in6_addr tmp; 31979383236SMasahide NAKAMURA int off; 32079383236SMasahide NAKAMURA 32179383236SMasahide NAKAMURA if (opt->dsthao) { 32279383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 32379383236SMasahide NAKAMURA if (likely(off >= 0)) { 324d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 325d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 3264e3fd7a0SAlexey Dobriyan tmp = iph->saddr; 3274e3fd7a0SAlexey Dobriyan iph->saddr = hao->addr; 3284e3fd7a0SAlexey Dobriyan hao->addr = tmp; 32979383236SMasahide NAKAMURA } 33079383236SMasahide NAKAMURA } 33179383236SMasahide NAKAMURA } 33279383236SMasahide NAKAMURA #else 33379383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 33479383236SMasahide NAKAMURA #endif 33579383236SMasahide NAKAMURA 336e8243534Sstephen hemminger static struct dst_entry *icmpv6_route_lookup(struct net *net, 337e8243534Sstephen hemminger struct sk_buff *skb, 338e8243534Sstephen hemminger struct sock *sk, 339e8243534Sstephen hemminger struct flowi6 *fl6) 340b42835dbSDavid S. Miller { 341b42835dbSDavid S. Miller struct dst_entry *dst, *dst2; 3424c9483b2SDavid S. Miller struct flowi6 fl2; 343b42835dbSDavid S. Miller int err; 344b42835dbSDavid S. Miller 345343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst, fl6); 346b42835dbSDavid S. Miller if (err) 347b42835dbSDavid S. Miller return ERR_PTR(err); 348b42835dbSDavid S. Miller 349b42835dbSDavid S. Miller /* 350b42835dbSDavid S. Miller * We won't send icmp if the destination is known 351b42835dbSDavid S. Miller * anycast. 352b42835dbSDavid S. Miller */ 3532647a9b0SMartin KaFai Lau if (ipv6_anycast_destination(dst, &fl6->daddr)) { 354ba7a46f1SJoe Perches net_dbg_ratelimited("icmp6_send: acast source\n"); 355b42835dbSDavid S. Miller dst_release(dst); 356b42835dbSDavid S. Miller return ERR_PTR(-EINVAL); 357b42835dbSDavid S. Miller } 358b42835dbSDavid S. Miller 359b42835dbSDavid S. Miller /* No need to clone since we're just using its address. */ 360b42835dbSDavid S. Miller dst2 = dst; 361b42835dbSDavid S. Miller 3624c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); 363452edd59SDavid S. Miller if (!IS_ERR(dst)) { 364b42835dbSDavid S. Miller if (dst != dst2) 365b42835dbSDavid S. Miller return dst; 366452edd59SDavid S. Miller } else { 367452edd59SDavid S. Miller if (PTR_ERR(dst) == -EPERM) 368b42835dbSDavid S. Miller dst = NULL; 369452edd59SDavid S. Miller else 370452edd59SDavid S. Miller return dst; 371b42835dbSDavid S. Miller } 372b42835dbSDavid S. Miller 3734c9483b2SDavid S. Miller err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); 374b42835dbSDavid S. Miller if (err) 375b42835dbSDavid S. Miller goto relookup_failed; 376b42835dbSDavid S. Miller 377343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst2, &fl2); 378b42835dbSDavid S. Miller if (err) 379b42835dbSDavid S. Miller goto relookup_failed; 380b42835dbSDavid S. Miller 3814c9483b2SDavid S. Miller dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); 382452edd59SDavid S. Miller if (!IS_ERR(dst2)) { 383b42835dbSDavid S. Miller dst_release(dst); 384b42835dbSDavid S. Miller dst = dst2; 385452edd59SDavid S. Miller } else { 386452edd59SDavid S. Miller err = PTR_ERR(dst2); 387452edd59SDavid S. Miller if (err == -EPERM) { 388b42835dbSDavid S. Miller dst_release(dst); 389452edd59SDavid S. Miller return dst2; 390452edd59SDavid S. Miller } else 391b42835dbSDavid S. Miller goto relookup_failed; 392b42835dbSDavid S. Miller } 393b42835dbSDavid S. Miller 394b42835dbSDavid S. Miller relookup_failed: 395b42835dbSDavid S. Miller if (dst) 396b42835dbSDavid S. Miller return dst; 397b42835dbSDavid S. Miller return ERR_PTR(err); 398b42835dbSDavid S. Miller } 399b42835dbSDavid S. Miller 4001b70d792SDavid Ahern static int icmp6_iif(const struct sk_buff *skb) 4011b70d792SDavid Ahern { 4021b70d792SDavid Ahern int iif = skb->dev->ifindex; 4031b70d792SDavid Ahern 4041b70d792SDavid Ahern /* for local traffic to local address, skb dev is the loopback 4051b70d792SDavid Ahern * device. Check if there is a dst attached to the skb and if so 40624b711edSDavid Ahern * get the real device index. Same is needed for replies to a link 40724b711edSDavid Ahern * local address on a device enslaved to an L3 master device 4081b70d792SDavid Ahern */ 40924b711edSDavid Ahern if (unlikely(iif == LOOPBACK_IFINDEX || netif_is_l3_master(skb->dev))) { 4101b70d792SDavid Ahern const struct rt6_info *rt6 = skb_rt6_info(skb); 4111b70d792SDavid Ahern 4121b70d792SDavid Ahern if (rt6) 4131b70d792SDavid Ahern iif = rt6->rt6i_idev->dev->ifindex; 4141b70d792SDavid Ahern } 4151b70d792SDavid Ahern 4161b70d792SDavid Ahern return iif; 4171b70d792SDavid Ahern } 4181b70d792SDavid Ahern 4191da177e4SLinus Torvalds /* 4201da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 4211da177e4SLinus Torvalds */ 422b1cadc1aSEric Dumazet static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info, 423b1cadc1aSEric Dumazet const struct in6_addr *force_saddr) 4241da177e4SLinus Torvalds { 4251da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 4260660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 42784427d53SYOSHIFUJI Hideaki struct sock *sk; 4288d933670SEric Dumazet struct net *net; 42984427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 430b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 4311da177e4SLinus Torvalds struct dst_entry *dst; 4321da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 4334c9483b2SDavid S. Miller struct flowi6 fl6; 4341da177e4SLinus Torvalds struct icmpv6_msg msg; 43526879da5SWei Wang struct ipcm6_cookie ipc6; 4361da177e4SLinus Torvalds int iif = 0; 4371da177e4SLinus Torvalds int addr_type = 0; 4381da177e4SLinus Torvalds int len; 4398d933670SEric Dumazet u32 mark; 4401da177e4SLinus Torvalds 44127a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 44229a3cad5SSimon Horman (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb)) 4431da177e4SLinus Torvalds return; 4441da177e4SLinus Torvalds 4458d933670SEric Dumazet if (!skb->dev) 4468d933670SEric Dumazet return; 4478d933670SEric Dumazet net = dev_net(skb->dev); 4488d933670SEric Dumazet mark = IP6_REPLY_MARK(net, skb->mark); 4491da177e4SLinus Torvalds /* 4501da177e4SLinus Torvalds * Make sure we respect the rules 4511da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 4525f5624cfSPravin B Shelar * Rule (e.1) is enforced by not using icmp6_send 4531da177e4SLinus Torvalds * in any code that processes icmp errors. 4541da177e4SLinus Torvalds */ 4551da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 4561da177e4SLinus Torvalds 457446fab59SFX Le Bail if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) || 458d94c1f92SFX Le Bail ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr)) 4591da177e4SLinus Torvalds saddr = &hdr->daddr; 4601da177e4SLinus Torvalds 4611da177e4SLinus Torvalds /* 4621da177e4SLinus Torvalds * Dest addr check 4631da177e4SLinus Torvalds */ 4641da177e4SLinus Torvalds 4659a6b4b39Szhuyj if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) { 4661da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 4671da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 4681da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 4691da177e4SLinus Torvalds (opt_unrec(skb, info)))) 4701da177e4SLinus Torvalds return; 4711da177e4SLinus Torvalds 4721da177e4SLinus Torvalds saddr = NULL; 4731da177e4SLinus Torvalds } 4741da177e4SLinus Torvalds 4751da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds /* 4781da177e4SLinus Torvalds * Source addr check 4791da177e4SLinus Torvalds */ 4801da177e4SLinus Torvalds 4814832c30dSDavid Ahern if (__ipv6_addr_needs_scope_id(addr_type)) { 4821b70d792SDavid Ahern iif = icmp6_iif(skb); 4834832c30dSDavid Ahern } else { 48479dc7e3fSDavid Ahern dst = skb_dst(skb); 48579dc7e3fSDavid Ahern iif = l3mdev_master_ifindex(dst ? dst->dev : skb->dev); 48679dc7e3fSDavid Ahern } 4871da177e4SLinus Torvalds 4881da177e4SLinus Torvalds /* 4898de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 4908de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 4918de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 4928de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 4931da177e4SLinus Torvalds */ 4941da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 4954b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n", 4964b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 4971da177e4SLinus Torvalds return; 4981da177e4SLinus Torvalds } 4991da177e4SLinus Torvalds 5001da177e4SLinus Torvalds /* 5011da177e4SLinus Torvalds * Never answer to a ICMP packet. 5021da177e4SLinus Torvalds */ 5031da177e4SLinus Torvalds if (is_ineligible(skb)) { 5044b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n", 5054b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5061da177e4SLinus Torvalds return; 5071da177e4SLinus Torvalds } 5081da177e4SLinus Torvalds 5097ba91ecbSJesper Dangaard Brouer /* Needed by both icmp_global_allow and icmpv6_xmit_lock */ 5107ba91ecbSJesper Dangaard Brouer local_bh_disable(); 5117ba91ecbSJesper Dangaard Brouer 5127ba91ecbSJesper Dangaard Brouer /* Check global sysctl_icmp_msgs_per_sec ratelimit */ 5130bc19985SStephen Suryaputra if (!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, type)) 5147ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 5157ba91ecbSJesper Dangaard Brouer 51679383236SMasahide NAKAMURA mip6_addr_swap(skb); 51779383236SMasahide NAKAMURA 5184c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 5194c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 5204e3fd7a0SAlexey Dobriyan fl6.daddr = hdr->saddr; 521b1cadc1aSEric Dumazet if (force_saddr) 522b1cadc1aSEric Dumazet saddr = force_saddr; 5231da177e4SLinus Torvalds if (saddr) 5244e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 525e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 5264c9483b2SDavid S. Miller fl6.flowi6_oif = iif; 5271958b856SDavid S. Miller fl6.fl6_icmp_type = type; 5281958b856SDavid S. Miller fl6.fl6_icmp_code = code; 529e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 530b4bac172SDavid Ahern fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, NULL); 5314c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 5321da177e4SLinus Torvalds 533fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 53463159f29SIan Morris if (!sk) 5357ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 536c0303efeSJesper Dangaard Brouer 537e110861fSLorenzo Colitti sk->sk_mark = mark; 538fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 539405666dbSDenis V. Lunev 5404c9483b2SDavid S. Miller if (!icmpv6_xrlim_allow(sk, type, &fl6)) 5411da177e4SLinus Torvalds goto out; 5421da177e4SLinus Torvalds 5431da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 5441da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 5451da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 5461da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 5471da177e4SLinus Torvalds 5484c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 5494c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 550c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 551c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 5521da177e4SLinus Torvalds 553b515430aSWillem de Bruijn ipcm6_init_sk(&ipc6, np); 55438b7097bSHannes Frederic Sowa fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 55538b7097bSHannes Frederic Sowa 5564c9483b2SDavid S. Miller dst = icmpv6_route_lookup(net, skb, sk, &fl6); 557b42835dbSDavid S. Miller if (IS_ERR(dst)) 5581da177e4SLinus Torvalds goto out; 5598de3351eSYOSHIFUJI Hideaki 56026879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 5611da177e4SLinus Torvalds 5621da177e4SLinus Torvalds msg.skb = skb; 563bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 564763ecff1SYasuyuki Kozakai msg.type = type; 5651da177e4SLinus Torvalds 5661da177e4SLinus Torvalds len = skb->len - msg.offset; 5671da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); 5681da177e4SLinus Torvalds if (len < 0) { 5694b3418fbSBjørn Mork net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n", 5704b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5711da177e4SLinus Torvalds goto out_dst_release; 5721da177e4SLinus Torvalds } 5731da177e4SLinus Torvalds 574cfdf7647SEric Dumazet rcu_read_lock(); 575cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 5761da177e4SLinus Torvalds 5774e64b1edSJoe Perches if (ip6_append_data(sk, icmpv6_getfrag, &msg, 5781da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 57926879da5SWei Wang sizeof(struct icmp6hdr), 58026879da5SWei Wang &ipc6, &fl6, (struct rt6_info *)dst, 5815fdaa88dSWillem de Bruijn MSG_DONTWAIT)) { 58243a43b60SHannes Frederic Sowa ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 5831da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 584cfdf7647SEric Dumazet } else { 5854e64b1edSJoe Perches icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 586cfdf7647SEric Dumazet len + sizeof(struct icmp6hdr)); 5871da177e4SLinus Torvalds } 588cfdf7647SEric Dumazet rcu_read_unlock(); 5891da177e4SLinus Torvalds out_dst_release: 5901da177e4SLinus Torvalds dst_release(dst); 5911da177e4SLinus Torvalds out: 592405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5937ba91ecbSJesper Dangaard Brouer out_bh_enable: 5947ba91ecbSJesper Dangaard Brouer local_bh_enable(); 5951da177e4SLinus Torvalds } 5965f5624cfSPravin B Shelar 5975f5624cfSPravin B Shelar /* Slightly more convenient version of icmp6_send. 5985f5624cfSPravin B Shelar */ 5995f5624cfSPravin B Shelar void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) 6005f5624cfSPravin B Shelar { 601b1cadc1aSEric Dumazet icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL); 6025f5624cfSPravin B Shelar kfree_skb(skb); 6035f5624cfSPravin B Shelar } 6047159039aSYOSHIFUJI Hideaki 6055fbba8acSEric Dumazet /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH 6065fbba8acSEric Dumazet * if sufficient data bytes are available 6075fbba8acSEric Dumazet * @nhs is the size of the tunnel header(s) : 6085fbba8acSEric Dumazet * Either an IPv4 header for SIT encap 6095fbba8acSEric Dumazet * an IPv4 header + GRE header for GRE encap 6105fbba8acSEric Dumazet */ 61120e1954fSEric Dumazet int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type, 61220e1954fSEric Dumazet unsigned int data_len) 6135fbba8acSEric Dumazet { 6142d7a3b27SEric Dumazet struct in6_addr temp_saddr; 6155fbba8acSEric Dumazet struct rt6_info *rt; 6165fbba8acSEric Dumazet struct sk_buff *skb2; 61720e1954fSEric Dumazet u32 info = 0; 6185fbba8acSEric Dumazet 6195fbba8acSEric Dumazet if (!pskb_may_pull(skb, nhs + sizeof(struct ipv6hdr) + 8)) 6205fbba8acSEric Dumazet return 1; 6215fbba8acSEric Dumazet 62220e1954fSEric Dumazet /* RFC 4884 (partial) support for ICMP extensions */ 62320e1954fSEric Dumazet if (data_len < 128 || (data_len & 7) || skb->len < data_len) 62420e1954fSEric Dumazet data_len = 0; 62520e1954fSEric Dumazet 62620e1954fSEric Dumazet skb2 = data_len ? skb_copy(skb, GFP_ATOMIC) : skb_clone(skb, GFP_ATOMIC); 6275fbba8acSEric Dumazet 6285fbba8acSEric Dumazet if (!skb2) 6295fbba8acSEric Dumazet return 1; 6305fbba8acSEric Dumazet 6315fbba8acSEric Dumazet skb_dst_drop(skb2); 6325fbba8acSEric Dumazet skb_pull(skb2, nhs); 6335fbba8acSEric Dumazet skb_reset_network_header(skb2); 6345fbba8acSEric Dumazet 635b75cc8f9SDavid Ahern rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 636b75cc8f9SDavid Ahern skb, 0); 6375fbba8acSEric Dumazet 6385fbba8acSEric Dumazet if (rt && rt->dst.dev) 6395fbba8acSEric Dumazet skb2->dev = rt->dst.dev; 6405fbba8acSEric Dumazet 6412d7a3b27SEric Dumazet ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr); 64220e1954fSEric Dumazet 64320e1954fSEric Dumazet if (data_len) { 64420e1954fSEric Dumazet /* RFC 4884 (partial) support : 64520e1954fSEric Dumazet * insert 0 padding at the end, before the extensions 64620e1954fSEric Dumazet */ 64720e1954fSEric Dumazet __skb_push(skb2, nhs); 64820e1954fSEric Dumazet skb_reset_network_header(skb2); 64920e1954fSEric Dumazet memmove(skb2->data, skb2->data + nhs, data_len - nhs); 65020e1954fSEric Dumazet memset(skb2->data + data_len - nhs, 0, nhs); 65120e1954fSEric Dumazet /* RFC 4884 4.5 : Length is measured in 64-bit words, 65220e1954fSEric Dumazet * and stored in reserved[0] 65320e1954fSEric Dumazet */ 65420e1954fSEric Dumazet info = (data_len/8) << 24; 65520e1954fSEric Dumazet } 6562d7a3b27SEric Dumazet if (type == ICMP_TIME_EXCEEDED) 6572d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 65820e1954fSEric Dumazet info, &temp_saddr); 6592d7a3b27SEric Dumazet else 6602d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 66120e1954fSEric Dumazet info, &temp_saddr); 6625fbba8acSEric Dumazet if (rt) 6635fbba8acSEric Dumazet ip6_rt_put(rt); 6645fbba8acSEric Dumazet 6655fbba8acSEric Dumazet kfree_skb(skb2); 6665fbba8acSEric Dumazet 6675fbba8acSEric Dumazet return 0; 6685fbba8acSEric Dumazet } 6695fbba8acSEric Dumazet EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach); 6705fbba8acSEric Dumazet 6711da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 6721da177e4SLinus Torvalds { 673c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 67484427d53SYOSHIFUJI Hideaki struct sock *sk; 6751da177e4SLinus Torvalds struct inet6_dev *idev; 67684427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 677b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 678cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 6791da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 6804c9483b2SDavid S. Miller struct flowi6 fl6; 6811da177e4SLinus Torvalds struct icmpv6_msg msg; 6821da177e4SLinus Torvalds struct dst_entry *dst; 68326879da5SWei Wang struct ipcm6_cookie ipc6; 684e110861fSLorenzo Colitti u32 mark = IP6_REPLY_MARK(net, skb->mark); 6850b03a5caSStephen Suryaputra bool acast; 6861da177e4SLinus Torvalds 68703f1ecccSStephen Suryaputra if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) && 68803f1ecccSStephen Suryaputra net->ipv6.sysctl.icmpv6_echo_ignore_multicast) 68903f1ecccSStephen Suryaputra return; 69003f1ecccSStephen Suryaputra 6910660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 6921da177e4SLinus Torvalds 6930b03a5caSStephen Suryaputra acast = ipv6_anycast_destination(skb_dst(skb), saddr); 6940b03a5caSStephen Suryaputra if (acast && net->ipv6.sysctl.icmpv6_echo_ignore_anycast) 6950b03a5caSStephen Suryaputra return; 6960b03a5caSStephen Suryaputra 697509aba3bSFX Le Bail if (!ipv6_unicast_destination(skb) && 6980b03a5caSStephen Suryaputra !(net->ipv6.sysctl.anycast_src_echo_reply && acast)) 6991da177e4SLinus Torvalds saddr = NULL; 7001da177e4SLinus Torvalds 7011da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 7021da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 7031da177e4SLinus Torvalds 7044c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 7054c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 7064e3fd7a0SAlexey Dobriyan fl6.daddr = ipv6_hdr(skb)->saddr; 7071da177e4SLinus Torvalds if (saddr) 7084e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 7091b70d792SDavid Ahern fl6.flowi6_oif = icmp6_iif(skb); 7101958b856SDavid S. Miller fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; 711e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 712e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 7134c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 7141da177e4SLinus Torvalds 7157ba91ecbSJesper Dangaard Brouer local_bh_disable(); 716fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 71763159f29SIan Morris if (!sk) 7187ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 719e110861fSLorenzo Colitti sk->sk_mark = mark; 720fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 721405666dbSDenis V. Lunev 7224c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 7234c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 724c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 725c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 7261da177e4SLinus Torvalds 7274e64b1edSJoe Perches if (ip6_dst_lookup(net, sk, &dst, &fl6)) 7281da177e4SLinus Torvalds goto out; 7294c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); 730452edd59SDavid S. Miller if (IS_ERR(dst)) 731e104411bSPatrick McHardy goto out; 7321da177e4SLinus Torvalds 7330bc19985SStephen Suryaputra /* Check the ratelimit */ 7340bc19985SStephen Suryaputra if ((!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, ICMPV6_ECHO_REPLY)) || 7350bc19985SStephen Suryaputra !icmpv6_xrlim_allow(sk, ICMPV6_ECHO_REPLY, &fl6)) 7360bc19985SStephen Suryaputra goto out_dst_release; 7370bc19985SStephen Suryaputra 738cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 7391da177e4SLinus Torvalds 7401da177e4SLinus Torvalds msg.skb = skb; 7411da177e4SLinus Torvalds msg.offset = 0; 742763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 7431da177e4SLinus Torvalds 744b515430aSWillem de Bruijn ipcm6_init_sk(&ipc6, np); 74526879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 74626879da5SWei Wang ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 74726879da5SWei Wang 7484e64b1edSJoe Perches if (ip6_append_data(sk, icmpv6_getfrag, &msg, 7494e64b1edSJoe Perches skb->len + sizeof(struct icmp6hdr), 75026879da5SWei Wang sizeof(struct icmp6hdr), &ipc6, &fl6, 7515fdaa88dSWillem de Bruijn (struct rt6_info *)dst, MSG_DONTWAIT)) { 752a16292a0SEric Dumazet __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 7531da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 754cfdf7647SEric Dumazet } else { 7554e64b1edSJoe Perches icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 756cfdf7647SEric Dumazet skb->len + sizeof(struct icmp6hdr)); 7571da177e4SLinus Torvalds } 7580bc19985SStephen Suryaputra out_dst_release: 7591da177e4SLinus Torvalds dst_release(dst); 7601da177e4SLinus Torvalds out: 761405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 7627ba91ecbSJesper Dangaard Brouer out_bh_enable: 7637ba91ecbSJesper Dangaard Brouer local_bh_enable(); 7641da177e4SLinus Torvalds } 7651da177e4SLinus Torvalds 766b94f1c09SDavid S. Miller void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 7671da177e4SLinus Torvalds { 76841135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 7691da177e4SLinus Torvalds int inner_offset; 77075f2811cSJesse Gross __be16 frag_off; 771f9242b6bSDavid S. Miller u8 nexthdr; 7727304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 7731da177e4SLinus Torvalds 7741da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 7757304fe46SDuan Jiong goto out; 7761da177e4SLinus Torvalds 7771da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 7781da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 7791da177e4SLinus Torvalds /* now skip over extension headers */ 78075f2811cSJesse Gross inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 78175f2811cSJesse Gross &nexthdr, &frag_off); 7821da177e4SLinus Torvalds if (inner_offset < 0) 7837304fe46SDuan Jiong goto out; 7841da177e4SLinus Torvalds } else { 7851da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 7861da177e4SLinus Torvalds } 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 7891da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 7907304fe46SDuan Jiong goto out; 7911da177e4SLinus Torvalds 7921da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 7931da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 7941da177e4SLinus Torvalds pmtu discovery. 7951da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 7961da177e4SLinus Torvalds --ANK (980726) 7971da177e4SLinus Torvalds */ 7981da177e4SLinus Torvalds 799f9242b6bSDavid S. Miller ipprot = rcu_dereference(inet6_protos[nexthdr]); 8001da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 8011da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 8021da177e4SLinus Torvalds 80369d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 8047304fe46SDuan Jiong return; 8057304fe46SDuan Jiong 8067304fe46SDuan Jiong out: 807a16292a0SEric Dumazet __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); 8081da177e4SLinus Torvalds } 8091da177e4SLinus Torvalds 8101da177e4SLinus Torvalds /* 8111da177e4SLinus Torvalds * Handle icmp messages 8121da177e4SLinus Torvalds */ 8131da177e4SLinus Torvalds 814e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 8151da177e4SLinus Torvalds { 816e6f86b0fSVirgile Jarry struct net *net = dev_net(skb->dev); 8171da177e4SLinus Torvalds struct net_device *dev = skb->dev; 8181da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 819b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 8201da177e4SLinus Torvalds struct icmp6hdr *hdr; 821d5fdd6baSBrian Haley u8 type; 822e3e32170SRick Jones bool success = false; 8231da177e4SLinus Torvalds 824aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 825def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 8268b7817f3SHerbert Xu int nh; 8278b7817f3SHerbert Xu 828def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 829aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 830aebcf82cSHerbert Xu goto drop_no_count; 831aebcf82cSHerbert Xu 83281aded24SDavid S. Miller if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) 8338b7817f3SHerbert Xu goto drop_no_count; 8348b7817f3SHerbert Xu 8358b7817f3SHerbert Xu nh = skb_network_offset(skb); 8368b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 8378b7817f3SHerbert Xu 8388b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 8398b7817f3SHerbert Xu goto drop_no_count; 8408b7817f3SHerbert Xu 8418b7817f3SHerbert Xu skb_set_network_header(skb, nh); 8428b7817f3SHerbert Xu } 8438b7817f3SHerbert Xu 844a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS); 8451da177e4SLinus Torvalds 8460660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 8470660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 8481da177e4SLinus Torvalds 84939471ac8STom Herbert if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { 850ba7a46f1SJoe Perches net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", 8510c6ce78aSHarvey Harrison saddr, daddr); 8526a5dc9e5SEric Dumazet goto csum_error; 8531da177e4SLinus Torvalds } 8541da177e4SLinus Torvalds 8558cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 8568cf22943SHerbert Xu goto discard_it; 8571da177e4SLinus Torvalds 858cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 8591da177e4SLinus Torvalds 8601da177e4SLinus Torvalds type = hdr->icmp6_type; 8611da177e4SLinus Torvalds 862f3832ed2SEric Dumazet ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type); 8631da177e4SLinus Torvalds 8641da177e4SLinus Torvalds switch (type) { 8651da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 866e6f86b0fSVirgile Jarry if (!net->ipv6.sysctl.icmpv6_echo_ignore_all) 8671da177e4SLinus Torvalds icmpv6_echo_reply(skb); 8681da177e4SLinus Torvalds break; 8691da177e4SLinus Torvalds 8701da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 871e3e32170SRick Jones success = ping_rcv(skb); 8721da177e4SLinus Torvalds break; 8731da177e4SLinus Torvalds 8741da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 8751da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 8761da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 8771da177e4SLinus Torvalds destination cache will allow to solve this problem 8781da177e4SLinus Torvalds --ANK (980726) 8791da177e4SLinus Torvalds */ 8801da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 8811da177e4SLinus Torvalds goto discard_it; 882cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 8831da177e4SLinus Torvalds 884275757e6SGustavo A. R. Silva /* to notify */ 885275757e6SGustavo A. R. Silva /* fall through */ 8861da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 8871da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 8881da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 8891da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 8901da177e4SLinus Torvalds break; 8911da177e4SLinus Torvalds 8921da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 8931da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 8941da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 8951da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 8961da177e4SLinus Torvalds case NDISC_REDIRECT: 8971da177e4SLinus Torvalds ndisc_rcv(skb); 8981da177e4SLinus Torvalds break; 8991da177e4SLinus Torvalds 9001da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 9011da177e4SLinus Torvalds igmp6_event_query(skb); 9021da177e4SLinus Torvalds break; 9031da177e4SLinus Torvalds 9041da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 9051da177e4SLinus Torvalds igmp6_event_report(skb); 9061da177e4SLinus Torvalds break; 9071da177e4SLinus Torvalds 9081da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 9091da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 9101da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 9111da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 9121da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 9131da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 9141da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 9151da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 9161da177e4SLinus Torvalds break; 9171da177e4SLinus Torvalds 9181da177e4SLinus Torvalds default: 9191da177e4SLinus Torvalds /* informational */ 9201da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 9211da177e4SLinus Torvalds break; 9221da177e4SLinus Torvalds 9234b3418fbSBjørn Mork net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n", 9244b3418fbSBjørn Mork saddr, daddr); 925ea85a0a2SDavid S. Miller 9261da177e4SLinus Torvalds /* 9271da177e4SLinus Torvalds * error of unknown type. 9281da177e4SLinus Torvalds * must pass to upper level 9291da177e4SLinus Torvalds */ 9301da177e4SLinus Torvalds 9311da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 9323ff50b79SStephen Hemminger } 9333ff50b79SStephen Hemminger 934e3e32170SRick Jones /* until the v6 path can be better sorted assume failure and 935e3e32170SRick Jones * preserve the status quo behaviour for the rest of the paths to here 936e3e32170SRick Jones */ 937e3e32170SRick Jones if (success) 938e3e32170SRick Jones consume_skb(skb); 939e3e32170SRick Jones else 9401da177e4SLinus Torvalds kfree_skb(skb); 941e3e32170SRick Jones 9421da177e4SLinus Torvalds return 0; 9431da177e4SLinus Torvalds 9446a5dc9e5SEric Dumazet csum_error: 945a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); 9461da177e4SLinus Torvalds discard_it: 947a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS); 9488b7817f3SHerbert Xu drop_no_count: 9491da177e4SLinus Torvalds kfree_skb(skb); 9501da177e4SLinus Torvalds return 0; 9511da177e4SLinus Torvalds } 9521da177e4SLinus Torvalds 9534c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, 95495e41e93SYOSHIFUJI Hideaki u8 type, 95595e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 95695e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 95795e41e93SYOSHIFUJI Hideaki int oif) 95895e41e93SYOSHIFUJI Hideaki { 9594c9483b2SDavid S. Miller memset(fl6, 0, sizeof(*fl6)); 9604e3fd7a0SAlexey Dobriyan fl6->saddr = *saddr; 9614e3fd7a0SAlexey Dobriyan fl6->daddr = *daddr; 9624c9483b2SDavid S. Miller fl6->flowi6_proto = IPPROTO_ICMPV6; 9631958b856SDavid S. Miller fl6->fl6_icmp_type = type; 9641958b856SDavid S. Miller fl6->fl6_icmp_code = 0; 9654c9483b2SDavid S. Miller fl6->flowi6_oif = oif; 9664c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); 96795e41e93SYOSHIFUJI Hideaki } 96895e41e93SYOSHIFUJI Hideaki 9693232a1efSKefeng Wang static void __net_exit icmpv6_sk_exit(struct net *net) 9703232a1efSKefeng Wang { 9713232a1efSKefeng Wang int i; 9723232a1efSKefeng Wang 9733232a1efSKefeng Wang for_each_possible_cpu(i) 97475efc250SKefeng Wang inet_ctl_sock_destroy(*per_cpu_ptr(net->ipv6.icmp_sk, i)); 97575efc250SKefeng Wang free_percpu(net->ipv6.icmp_sk); 9763232a1efSKefeng Wang } 9773232a1efSKefeng Wang 97898c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 9791da177e4SLinus Torvalds { 9801da177e4SLinus Torvalds struct sock *sk; 9813232a1efSKefeng Wang int err, i; 9821da177e4SLinus Torvalds 98375efc250SKefeng Wang net->ipv6.icmp_sk = alloc_percpu(struct sock *); 98463159f29SIan Morris if (!net->ipv6.icmp_sk) 98579c91159SDenis V. Lunev return -ENOMEM; 98679c91159SDenis V. Lunev 9876f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 9881ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 9891ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 9901da177e4SLinus Torvalds if (err < 0) { 991f3213831SJoe Perches pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", 9921da177e4SLinus Torvalds err); 9931da177e4SLinus Torvalds goto fail; 9941da177e4SLinus Torvalds } 9951da177e4SLinus Torvalds 99675efc250SKefeng Wang *per_cpu_ptr(net->ipv6.icmp_sk, i) = sk; 9975c8cafd6SDenis V. Lunev 9981da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 9991da177e4SLinus Torvalds * sk_buff struct overhead. 10001da177e4SLinus Torvalds */ 100187fb4b7bSEric Dumazet sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); 10021da177e4SLinus Torvalds } 10031da177e4SLinus Torvalds return 0; 10041da177e4SLinus Torvalds 10051da177e4SLinus Torvalds fail: 10063232a1efSKefeng Wang icmpv6_sk_exit(net); 10071da177e4SLinus Torvalds return err; 10081da177e4SLinus Torvalds } 10091da177e4SLinus Torvalds 10108ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 101198c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 101298c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 101398c6d1b2SDenis V. Lunev }; 101498c6d1b2SDenis V. Lunev 101598c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 101698c6d1b2SDenis V. Lunev { 101798c6d1b2SDenis V. Lunev int err; 101898c6d1b2SDenis V. Lunev 101998c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 102098c6d1b2SDenis V. Lunev if (err < 0) 102198c6d1b2SDenis V. Lunev return err; 102298c6d1b2SDenis V. Lunev 102398c6d1b2SDenis V. Lunev err = -EAGAIN; 102498c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 102598c6d1b2SDenis V. Lunev goto fail; 10265f5624cfSPravin B Shelar 10275f5624cfSPravin B Shelar err = inet6_register_icmp_sender(icmp6_send); 10285f5624cfSPravin B Shelar if (err) 10295f5624cfSPravin B Shelar goto sender_reg_err; 103098c6d1b2SDenis V. Lunev return 0; 103198c6d1b2SDenis V. Lunev 10325f5624cfSPravin B Shelar sender_reg_err: 10335f5624cfSPravin B Shelar inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 103498c6d1b2SDenis V. Lunev fail: 1035f3213831SJoe Perches pr_err("Failed to register ICMP6 protocol\n"); 103698c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 103798c6d1b2SDenis V. Lunev return err; 103898c6d1b2SDenis V. Lunev } 103998c6d1b2SDenis V. Lunev 10408ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 104198c6d1b2SDenis V. Lunev { 10425f5624cfSPravin B Shelar inet6_unregister_icmp_sender(icmp6_send); 104398c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 10441da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 10451da177e4SLinus Torvalds } 10461da177e4SLinus Torvalds 104798c6d1b2SDenis V. Lunev 10489b5b5cffSArjan van de Ven static const struct icmp6_err { 10491da177e4SLinus Torvalds int err; 10501da177e4SLinus Torvalds int fatal; 10511da177e4SLinus Torvalds } tab_unreach[] = { 10521da177e4SLinus Torvalds { /* NOROUTE */ 10531da177e4SLinus Torvalds .err = ENETUNREACH, 10541da177e4SLinus Torvalds .fatal = 0, 10551da177e4SLinus Torvalds }, 10561da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 10571da177e4SLinus Torvalds .err = EACCES, 10581da177e4SLinus Torvalds .fatal = 1, 10591da177e4SLinus Torvalds }, 10601da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 10611da177e4SLinus Torvalds .err = EHOSTUNREACH, 10621da177e4SLinus Torvalds .fatal = 0, 10631da177e4SLinus Torvalds }, 10641da177e4SLinus Torvalds { /* ADDR_UNREACH */ 10651da177e4SLinus Torvalds .err = EHOSTUNREACH, 10661da177e4SLinus Torvalds .fatal = 0, 10671da177e4SLinus Torvalds }, 10681da177e4SLinus Torvalds { /* PORT_UNREACH */ 10691da177e4SLinus Torvalds .err = ECONNREFUSED, 10701da177e4SLinus Torvalds .fatal = 1, 10711da177e4SLinus Torvalds }, 107261e76b17SJiri Bohac { /* POLICY_FAIL */ 107361e76b17SJiri Bohac .err = EACCES, 107461e76b17SJiri Bohac .fatal = 1, 107561e76b17SJiri Bohac }, 107661e76b17SJiri Bohac { /* REJECT_ROUTE */ 107761e76b17SJiri Bohac .err = EACCES, 107861e76b17SJiri Bohac .fatal = 1, 107961e76b17SJiri Bohac }, 10801da177e4SLinus Torvalds }; 10811da177e4SLinus Torvalds 1082d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 10831da177e4SLinus Torvalds { 10841da177e4SLinus Torvalds int fatal = 0; 10851da177e4SLinus Torvalds 10861da177e4SLinus Torvalds *err = EPROTO; 10871da177e4SLinus Torvalds 10881da177e4SLinus Torvalds switch (type) { 10891da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 10901da177e4SLinus Torvalds fatal = 1; 109161e76b17SJiri Bohac if (code < ARRAY_SIZE(tab_unreach)) { 10921da177e4SLinus Torvalds *err = tab_unreach[code].err; 10931da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 10941da177e4SLinus Torvalds } 10951da177e4SLinus Torvalds break; 10961da177e4SLinus Torvalds 10971da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 10981da177e4SLinus Torvalds *err = EMSGSIZE; 10991da177e4SLinus Torvalds break; 11001da177e4SLinus Torvalds 11011da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 11021da177e4SLinus Torvalds *err = EPROTO; 11031da177e4SLinus Torvalds fatal = 1; 11041da177e4SLinus Torvalds break; 11051da177e4SLinus Torvalds 11061da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 11071da177e4SLinus Torvalds *err = EHOSTUNREACH; 11081da177e4SLinus Torvalds break; 11093ff50b79SStephen Hemminger } 11101da177e4SLinus Torvalds 11111da177e4SLinus Torvalds return fatal; 11121da177e4SLinus Torvalds } 11137159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 11147159039aSYOSHIFUJI Hideaki 11151da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 1116e8243534Sstephen hemminger static struct ctl_table ipv6_icmp_table_template[] = { 11171da177e4SLinus Torvalds { 11181da177e4SLinus Torvalds .procname = "ratelimit", 111941a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 11201da177e4SLinus Torvalds .maxlen = sizeof(int), 11211da177e4SLinus Torvalds .mode = 0644, 11226d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 11231da177e4SLinus Torvalds }, 1124e6f86b0fSVirgile Jarry { 1125e6f86b0fSVirgile Jarry .procname = "echo_ignore_all", 1126e6f86b0fSVirgile Jarry .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_all, 1127e6f86b0fSVirgile Jarry .maxlen = sizeof(int), 1128e6f86b0fSVirgile Jarry .mode = 0644, 1129e6f86b0fSVirgile Jarry .proc_handler = proc_dointvec, 1130e6f86b0fSVirgile Jarry }, 113103f1ecccSStephen Suryaputra { 113203f1ecccSStephen Suryaputra .procname = "echo_ignore_multicast", 113303f1ecccSStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_multicast, 113403f1ecccSStephen Suryaputra .maxlen = sizeof(int), 113503f1ecccSStephen Suryaputra .mode = 0644, 113603f1ecccSStephen Suryaputra .proc_handler = proc_dointvec, 113703f1ecccSStephen Suryaputra }, 11380b03a5caSStephen Suryaputra { 11390b03a5caSStephen Suryaputra .procname = "echo_ignore_anycast", 11400b03a5caSStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_anycast, 11410b03a5caSStephen Suryaputra .maxlen = sizeof(int), 11420b03a5caSStephen Suryaputra .mode = 0644, 11430b03a5caSStephen Suryaputra .proc_handler = proc_dointvec, 11440b03a5caSStephen Suryaputra }, 11450bc19985SStephen Suryaputra { 11460bc19985SStephen Suryaputra .procname = "ratemask", 11470bc19985SStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_ratemask_ptr, 11480bc19985SStephen Suryaputra .maxlen = ICMPV6_MSG_MAX + 1, 11490bc19985SStephen Suryaputra .mode = 0644, 11500bc19985SStephen Suryaputra .proc_handler = proc_do_large_bitmap, 11510bc19985SStephen Suryaputra }, 1152f8572d8fSEric W. Biederman { }, 11531da177e4SLinus Torvalds }; 1154760f2d01SDaniel Lezcano 11552c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 1156760f2d01SDaniel Lezcano { 1157760f2d01SDaniel Lezcano struct ctl_table *table; 1158760f2d01SDaniel Lezcano 1159760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 1160760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 1161760f2d01SDaniel Lezcano GFP_KERNEL); 11625ee09105SYOSHIFUJI Hideaki 1163e6f86b0fSVirgile Jarry if (table) { 11645ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 1165e6f86b0fSVirgile Jarry table[1].data = &net->ipv6.sysctl.icmpv6_echo_ignore_all; 116603f1ecccSStephen Suryaputra table[2].data = &net->ipv6.sysctl.icmpv6_echo_ignore_multicast; 11670b03a5caSStephen Suryaputra table[3].data = &net->ipv6.sysctl.icmpv6_echo_ignore_anycast; 11680bc19985SStephen Suryaputra table[4].data = &net->ipv6.sysctl.icmpv6_ratemask_ptr; 1169e6f86b0fSVirgile Jarry } 1170760f2d01SDaniel Lezcano return table; 1171760f2d01SDaniel Lezcano } 11721da177e4SLinus Torvalds #endif 1173