12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * Internet Control Message Protocol (ICMPv6) 41da177e4SLinus Torvalds * Linux INET6 implementation 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Authors: 71da177e4SLinus Torvalds * Pedro Roque <roque@di.fc.ul.pt> 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * Based on net/ipv4/icmp.c 101da177e4SLinus Torvalds * 111da177e4SLinus Torvalds * RFC 1885 121da177e4SLinus Torvalds */ 131da177e4SLinus Torvalds 141da177e4SLinus Torvalds /* 151da177e4SLinus Torvalds * Changes: 161da177e4SLinus Torvalds * 171da177e4SLinus Torvalds * Andi Kleen : exception handling 181da177e4SLinus Torvalds * Andi Kleen add rate limits. never reply to a icmp. 191da177e4SLinus Torvalds * add more length checks and other fixes. 201da177e4SLinus Torvalds * yoshfuji : ensure to sent parameter problem for 211da177e4SLinus Torvalds * fragments. 221da177e4SLinus Torvalds * YOSHIFUJI Hideaki @USAGI: added sysctl for icmp rate limit. 231da177e4SLinus Torvalds * Randy Dunlap and 241da177e4SLinus Torvalds * YOSHIFUJI Hideaki @USAGI: Per-interface statistics support 251da177e4SLinus Torvalds * Kazunori MIYAZAWA @USAGI: change output process to use ip6_append_data 261da177e4SLinus Torvalds */ 271da177e4SLinus Torvalds 28f3213831SJoe Perches #define pr_fmt(fmt) "IPv6: " fmt 29f3213831SJoe Perches 301da177e4SLinus Torvalds #include <linux/module.h> 311da177e4SLinus Torvalds #include <linux/errno.h> 321da177e4SLinus Torvalds #include <linux/types.h> 331da177e4SLinus Torvalds #include <linux/socket.h> 341da177e4SLinus Torvalds #include <linux/in.h> 351da177e4SLinus Torvalds #include <linux/kernel.h> 361da177e4SLinus Torvalds #include <linux/sockios.h> 371da177e4SLinus Torvalds #include <linux/net.h> 381da177e4SLinus Torvalds #include <linux/skbuff.h> 391da177e4SLinus Torvalds #include <linux/init.h> 40763ecff1SYasuyuki Kozakai #include <linux/netfilter.h> 415a0e3ad6STejun Heo #include <linux/slab.h> 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 441da177e4SLinus Torvalds #include <linux/sysctl.h> 451da177e4SLinus Torvalds #endif 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds #include <linux/inet.h> 481da177e4SLinus Torvalds #include <linux/netdevice.h> 491da177e4SLinus Torvalds #include <linux/icmpv6.h> 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds #include <net/ip.h> 521da177e4SLinus Torvalds #include <net/sock.h> 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds #include <net/ipv6.h> 551da177e4SLinus Torvalds #include <net/ip6_checksum.h> 566d0bfe22SLorenzo Colitti #include <net/ping.h> 571da177e4SLinus Torvalds #include <net/protocol.h> 581da177e4SLinus Torvalds #include <net/raw.h> 591da177e4SLinus Torvalds #include <net/rawv6.h> 60e4129440SAndrew Lunn #include <net/seg6.h> 611da177e4SLinus Torvalds #include <net/transp_v6.h> 621da177e4SLinus Torvalds #include <net/ip6_route.h> 631da177e4SLinus Torvalds #include <net/addrconf.h> 641da177e4SLinus Torvalds #include <net/icmp.h> 658b7817f3SHerbert Xu #include <net/xfrm.h> 661ed8516fSDenis V. Lunev #include <net/inet_common.h> 67825edac4SHannes Frederic Sowa #include <net/dsfield.h> 68ca254490SDavid Ahern #include <net/l3mdev.h> 691da177e4SLinus Torvalds 707c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 711da177e4SLinus Torvalds 726a17b961SEric Dumazet static DEFINE_PER_CPU(struct sock *, ipv6_icmp_sk); 731da177e4SLinus Torvalds 7432bbd879SStefano Brivio static int icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 756f809da2SSteffen Klassert u8 type, u8 code, int offset, __be32 info) 766f809da2SSteffen Klassert { 776d0bfe22SLorenzo Colitti /* icmpv6_notify checks 8 bytes can be pulled, icmp6hdr is 8 bytes */ 786d0bfe22SLorenzo Colitti struct icmp6hdr *icmp6 = (struct icmp6hdr *) (skb->data + offset); 796f809da2SSteffen Klassert struct net *net = dev_net(skb->dev); 806f809da2SSteffen Klassert 816f809da2SSteffen Klassert if (type == ICMPV6_PKT_TOOBIG) 825f379ef5SGeorg Kohmann ip6_update_pmtu(skb, net, info, skb->dev->ifindex, 0, sock_net_uid(net, NULL)); 836f809da2SSteffen Klassert else if (type == NDISC_REDIRECT) 84e2d118a1SLorenzo Colitti ip6_redirect(skb, net, skb->dev->ifindex, 0, 85e2d118a1SLorenzo Colitti sock_net_uid(net, NULL)); 866d0bfe22SLorenzo Colitti 876d0bfe22SLorenzo Colitti if (!(type & ICMPV6_INFOMSG_MASK)) 886d0bfe22SLorenzo Colitti if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST) 89dcb94b88SHannes Frederic Sowa ping_err(skb, offset, ntohl(info)); 9032bbd879SStefano Brivio 9132bbd879SStefano Brivio return 0; 926f809da2SSteffen Klassert } 936f809da2SSteffen Klassert 94e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb); 951da177e4SLinus Torvalds 9641135cc8SAlexey Dobriyan static const struct inet6_protocol icmpv6_protocol = { 971da177e4SLinus Torvalds .handler = icmpv6_rcv, 986f809da2SSteffen Klassert .err_handler = icmpv6_err, 998b7817f3SHerbert Xu .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1001da177e4SLinus Torvalds }; 1011da177e4SLinus Torvalds 1027ba91ecbSJesper Dangaard Brouer /* Called with BH disabled */ 1036a17b961SEric Dumazet static struct sock *icmpv6_xmit_lock(struct net *net) 1041da177e4SLinus Torvalds { 105fdc0bde9SDenis V. Lunev struct sock *sk; 106fdc0bde9SDenis V. Lunev 1076a17b961SEric Dumazet sk = this_cpu_read(ipv6_icmp_sk); 108405666dbSDenis V. Lunev if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { 1091da177e4SLinus Torvalds /* This can happen if the output path (f.e. SIT or 1101da177e4SLinus Torvalds * ip6ip6 tunnel) signals dst_link_failure() for an 1111da177e4SLinus Torvalds * outgoing ICMP6 packet. 1121da177e4SLinus Torvalds */ 113fdc0bde9SDenis V. Lunev return NULL; 1141da177e4SLinus Torvalds } 1156a17b961SEric Dumazet sock_net_set(sk, net); 116fdc0bde9SDenis V. Lunev return sk; 1171da177e4SLinus Torvalds } 1181da177e4SLinus Torvalds 1196a17b961SEric Dumazet static void icmpv6_xmit_unlock(struct sock *sk) 1201da177e4SLinus Torvalds { 1216a17b961SEric Dumazet sock_net_set(sk, &init_net); 1227ba91ecbSJesper Dangaard Brouer spin_unlock(&sk->sk_lock.slock); 1231da177e4SLinus Torvalds } 1241da177e4SLinus Torvalds 1251da177e4SLinus Torvalds /* 1261da177e4SLinus Torvalds * Figure out, may we reply to this packet with icmp error. 1271da177e4SLinus Torvalds * 1281da177e4SLinus Torvalds * We do not reply, if: 1291da177e4SLinus Torvalds * - it was icmp error message. 1301da177e4SLinus Torvalds * - it is truncated, so that it is known, that protocol is ICMPV6 1311da177e4SLinus Torvalds * (i.e. in the middle of some exthdr) 1321da177e4SLinus Torvalds * 1331da177e4SLinus Torvalds * --ANK (980726) 1341da177e4SLinus Torvalds */ 1351da177e4SLinus Torvalds 136a50feda5SEric Dumazet static bool is_ineligible(const struct sk_buff *skb) 1371da177e4SLinus Torvalds { 1380660e03fSArnaldo Carvalho de Melo int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; 1391da177e4SLinus Torvalds int len = skb->len - ptr; 1400660e03fSArnaldo Carvalho de Melo __u8 nexthdr = ipv6_hdr(skb)->nexthdr; 14175f2811cSJesse Gross __be16 frag_off; 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds if (len < 0) 144a50feda5SEric Dumazet return true; 1451da177e4SLinus Torvalds 14675f2811cSJesse Gross ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off); 1471da177e4SLinus Torvalds if (ptr < 0) 148a50feda5SEric Dumazet return false; 1491da177e4SLinus Torvalds if (nexthdr == IPPROTO_ICMPV6) { 1501da177e4SLinus Torvalds u8 _type, *tp; 1511da177e4SLinus Torvalds tp = skb_header_pointer(skb, 1521da177e4SLinus Torvalds ptr+offsetof(struct icmp6hdr, icmp6_type), 1531da177e4SLinus Torvalds sizeof(_type), &_type); 1542efdaaafSHangbin Liu 1552efdaaafSHangbin Liu /* Based on RFC 8200, Section 4.5 Fragment Header, return 1562efdaaafSHangbin Liu * false if this is a fragment packet with no icmp header info. 1572efdaaafSHangbin Liu */ 1582efdaaafSHangbin Liu if (!tp && frag_off != 0) 1592efdaaafSHangbin Liu return false; 1602efdaaafSHangbin Liu else if (!tp || !(*tp & ICMPV6_INFOMSG_MASK)) 161a50feda5SEric Dumazet return true; 1621da177e4SLinus Torvalds } 163a50feda5SEric Dumazet return false; 1641da177e4SLinus Torvalds } 1651da177e4SLinus Torvalds 1660bc19985SStephen Suryaputra static bool icmpv6_mask_allow(struct net *net, int type) 167c0303efeSJesper Dangaard Brouer { 1680bc19985SStephen Suryaputra if (type > ICMPV6_MSG_MAX) 169c0303efeSJesper Dangaard Brouer return true; 170c0303efeSJesper Dangaard Brouer 1710bc19985SStephen Suryaputra /* Limit if icmp type is set in ratemask. */ 1720bc19985SStephen Suryaputra if (!test_bit(type, net->ipv6.sysctl.icmpv6_ratemask)) 173c0303efeSJesper Dangaard Brouer return true; 174c0303efeSJesper Dangaard Brouer 175c0303efeSJesper Dangaard Brouer return false; 176c0303efeSJesper Dangaard Brouer } 177c0303efeSJesper Dangaard Brouer 1780bc19985SStephen Suryaputra static bool icmpv6_global_allow(struct net *net, int type) 179c0303efeSJesper Dangaard Brouer { 1800bc19985SStephen Suryaputra if (icmpv6_mask_allow(net, type)) 181c0303efeSJesper Dangaard Brouer return true; 182c0303efeSJesper Dangaard Brouer 183c0303efeSJesper Dangaard Brouer if (icmp_global_allow()) 184c0303efeSJesper Dangaard Brouer return true; 185c0303efeSJesper Dangaard Brouer 186d0941130SJamie Bainbridge __ICMP_INC_STATS(net, ICMP_MIB_RATELIMITGLOBAL); 187c0303efeSJesper Dangaard Brouer return false; 188c0303efeSJesper Dangaard Brouer } 189c0303efeSJesper Dangaard Brouer 1901da177e4SLinus Torvalds /* 1911da177e4SLinus Torvalds * Check the ICMP output rate limit 1921da177e4SLinus Torvalds */ 1934cdf507dSEric Dumazet static bool icmpv6_xrlim_allow(struct sock *sk, u8 type, 1944c9483b2SDavid S. Miller struct flowi6 *fl6) 1951da177e4SLinus Torvalds { 1963b1e0a65SYOSHIFUJI Hideaki struct net *net = sock_net(sk); 1974cdf507dSEric Dumazet struct dst_entry *dst; 19892d86829SDavid S. Miller bool res = false; 1991da177e4SLinus Torvalds 2000bc19985SStephen Suryaputra if (icmpv6_mask_allow(net, type)) 20192d86829SDavid S. Miller return true; 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds /* 2041da177e4SLinus Torvalds * Look up the output route. 2051da177e4SLinus Torvalds * XXX: perhaps the expire for routing entries cloned by 2061da177e4SLinus Torvalds * this lookup should be more aggressive (not longer than timeout). 2071da177e4SLinus Torvalds */ 2084c9483b2SDavid S. Miller dst = ip6_route_output(net, sk, fl6); 2091da177e4SLinus Torvalds if (dst->error) { 2103bd653c8SDenis V. Lunev IP6_INC_STATS(net, ip6_dst_idev(dst), 211a11d206dSYOSHIFUJI Hideaki IPSTATS_MIB_OUTNOROUTES); 2121da177e4SLinus Torvalds } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { 21392d86829SDavid S. Miller res = true; 2141da177e4SLinus Torvalds } else { 2151da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 2169a43b709SBenjamin Thery int tmo = net->ipv6.sysctl.icmpv6_time; 217c0303efeSJesper Dangaard Brouer struct inet_peer *peer; 2181da177e4SLinus Torvalds 2191da177e4SLinus Torvalds /* Give more bandwidth to wider prefixes. */ 2201da177e4SLinus Torvalds if (rt->rt6i_dst.plen < 128) 2211da177e4SLinus Torvalds tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 2221da177e4SLinus Torvalds 223c0303efeSJesper Dangaard Brouer peer = inet_getpeer_v6(net->ipv6.peers, &fl6->daddr, 1); 224fbfe95a4SDavid S. Miller res = inet_peer_xrlim_allow(peer, tmo); 2251d861aa4SDavid S. Miller if (peer) 2261d861aa4SDavid S. Miller inet_putpeer(peer); 2271da177e4SLinus Torvalds } 228d0941130SJamie Bainbridge if (!res) 229d0941130SJamie Bainbridge __ICMP6_INC_STATS(net, ip6_dst_idev(dst), 230d0941130SJamie Bainbridge ICMP6_MIB_RATELIMITHOST); 2311da177e4SLinus Torvalds dst_release(dst); 2321da177e4SLinus Torvalds return res; 2331da177e4SLinus Torvalds } 2341da177e4SLinus Torvalds 235b93cfb9cSTim Stallard static bool icmpv6_rt_has_prefsrc(struct sock *sk, u8 type, 236b93cfb9cSTim Stallard struct flowi6 *fl6) 237b93cfb9cSTim Stallard { 238b93cfb9cSTim Stallard struct net *net = sock_net(sk); 239b93cfb9cSTim Stallard struct dst_entry *dst; 240b93cfb9cSTim Stallard bool res = false; 241b93cfb9cSTim Stallard 242b93cfb9cSTim Stallard dst = ip6_route_output(net, sk, fl6); 243b93cfb9cSTim Stallard if (!dst->error) { 244b93cfb9cSTim Stallard struct rt6_info *rt = (struct rt6_info *)dst; 245b93cfb9cSTim Stallard struct in6_addr prefsrc; 246b93cfb9cSTim Stallard 247b93cfb9cSTim Stallard rt6_get_prefsrc(rt, &prefsrc); 248b93cfb9cSTim Stallard res = !ipv6_addr_any(&prefsrc); 249b93cfb9cSTim Stallard } 250b93cfb9cSTim Stallard dst_release(dst); 251b93cfb9cSTim Stallard return res; 252b93cfb9cSTim Stallard } 253b93cfb9cSTim Stallard 2541da177e4SLinus Torvalds /* 2551da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2561da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2571da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2581da177e4SLinus Torvalds * highest-order two bits set to 10 2591da177e4SLinus Torvalds */ 2601da177e4SLinus Torvalds 261a50feda5SEric Dumazet static bool opt_unrec(struct sk_buff *skb, __u32 offset) 2621da177e4SLinus Torvalds { 2631da177e4SLinus Torvalds u8 _optval, *op; 2641da177e4SLinus Torvalds 265bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2661da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 26763159f29SIan Morris if (!op) 268a50feda5SEric Dumazet return true; 2691da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2701da177e4SLinus Torvalds } 2711da177e4SLinus Torvalds 2724e64b1edSJoe Perches void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 2736d0bfe22SLorenzo Colitti struct icmp6hdr *thdr, int len) 2741da177e4SLinus Torvalds { 2751da177e4SLinus Torvalds struct sk_buff *skb; 2761da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2771da177e4SLinus Torvalds 278e5d08d71SIan Morris skb = skb_peek(&sk->sk_write_queue); 27963159f29SIan Morris if (!skb) 2804e64b1edSJoe Perches return; 2811da177e4SLinus Torvalds 282cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2831da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2841da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2851da177e4SLinus Torvalds 2861da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 28707f0757aSJoe Perches skb->csum = csum_partial(icmp6h, 2881da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2894c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2904c9483b2SDavid S. Miller &fl6->daddr, 2914c9483b2SDavid S. Miller len, fl6->flowi6_proto, 2921da177e4SLinus Torvalds skb->csum); 2931da177e4SLinus Torvalds } else { 294868c86bcSAl Viro __wsum tmp_csum = 0; 2951da177e4SLinus Torvalds 2961da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2971da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2981da177e4SLinus Torvalds } 2991da177e4SLinus Torvalds 30007f0757aSJoe Perches tmp_csum = csum_partial(icmp6h, 3011da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 3024c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 3034c9483b2SDavid S. Miller &fl6->daddr, 3044c9483b2SDavid S. Miller len, fl6->flowi6_proto, 305868c86bcSAl Viro tmp_csum); 3061da177e4SLinus Torvalds } 3071da177e4SLinus Torvalds ip6_push_pending_frames(sk); 3081da177e4SLinus Torvalds } 3091da177e4SLinus Torvalds 3101da177e4SLinus Torvalds struct icmpv6_msg { 3111da177e4SLinus Torvalds struct sk_buff *skb; 3121da177e4SLinus Torvalds int offset; 313763ecff1SYasuyuki Kozakai uint8_t type; 3141da177e4SLinus Torvalds }; 3151da177e4SLinus Torvalds 3161da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 3171da177e4SLinus Torvalds { 3181da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 3191da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 3208d5930dfSAl Viro __wsum csum; 3211da177e4SLinus Torvalds 3221da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 3238d5930dfSAl Viro to, len); 3241da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 325763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 326763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 3271da177e4SLinus Torvalds return 0; 3281da177e4SLinus Torvalds } 3291da177e4SLinus Torvalds 33007a93626SAmerigo Wang #if IS_ENABLED(CONFIG_IPV6_MIP6) 331ee576c47SJason A. Donenfeld static void mip6_addr_swap(struct sk_buff *skb, const struct inet6_skb_parm *opt) 33279383236SMasahide NAKAMURA { 3330660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 33479383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 33579383236SMasahide NAKAMURA int off; 33679383236SMasahide NAKAMURA 33779383236SMasahide NAKAMURA if (opt->dsthao) { 33879383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 33979383236SMasahide NAKAMURA if (likely(off >= 0)) { 340d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 341d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 342bc617613SJiapeng Chong swap(iph->saddr, hao->addr); 34379383236SMasahide NAKAMURA } 34479383236SMasahide NAKAMURA } 34579383236SMasahide NAKAMURA } 34679383236SMasahide NAKAMURA #else 347ee576c47SJason A. Donenfeld static inline void mip6_addr_swap(struct sk_buff *skb, const struct inet6_skb_parm *opt) {} 34879383236SMasahide NAKAMURA #endif 34979383236SMasahide NAKAMURA 350e8243534Sstephen hemminger static struct dst_entry *icmpv6_route_lookup(struct net *net, 351e8243534Sstephen hemminger struct sk_buff *skb, 352e8243534Sstephen hemminger struct sock *sk, 353e8243534Sstephen hemminger struct flowi6 *fl6) 354b42835dbSDavid S. Miller { 355b42835dbSDavid S. Miller struct dst_entry *dst, *dst2; 3564c9483b2SDavid S. Miller struct flowi6 fl2; 357b42835dbSDavid S. Miller int err; 358b42835dbSDavid S. Miller 359343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst, fl6); 360b42835dbSDavid S. Miller if (err) 361b42835dbSDavid S. Miller return ERR_PTR(err); 362b42835dbSDavid S. Miller 363b42835dbSDavid S. Miller /* 364b42835dbSDavid S. Miller * We won't send icmp if the destination is known 365*7ab75456SMahesh Bandewar * anycast unless we need to treat anycast as unicast. 366b42835dbSDavid S. Miller */ 367*7ab75456SMahesh Bandewar if (!READ_ONCE(net->ipv6.sysctl.icmpv6_error_anycast_as_unicast) && 368*7ab75456SMahesh Bandewar ipv6_anycast_destination(dst, &fl6->daddr)) { 369ba7a46f1SJoe Perches net_dbg_ratelimited("icmp6_send: acast source\n"); 370b42835dbSDavid S. Miller dst_release(dst); 371b42835dbSDavid S. Miller return ERR_PTR(-EINVAL); 372b42835dbSDavid S. Miller } 373b42835dbSDavid S. Miller 374b42835dbSDavid S. Miller /* No need to clone since we're just using its address. */ 375b42835dbSDavid S. Miller dst2 = dst; 376b42835dbSDavid S. Miller 3774c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); 378452edd59SDavid S. Miller if (!IS_ERR(dst)) { 379b42835dbSDavid S. Miller if (dst != dst2) 380b42835dbSDavid S. Miller return dst; 381452edd59SDavid S. Miller } else { 382452edd59SDavid S. Miller if (PTR_ERR(dst) == -EPERM) 383b42835dbSDavid S. Miller dst = NULL; 384452edd59SDavid S. Miller else 385452edd59SDavid S. Miller return dst; 386b42835dbSDavid S. Miller } 387b42835dbSDavid S. Miller 3884c9483b2SDavid S. Miller err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); 389b42835dbSDavid S. Miller if (err) 390b42835dbSDavid S. Miller goto relookup_failed; 391b42835dbSDavid S. Miller 392343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst2, &fl2); 393b42835dbSDavid S. Miller if (err) 394b42835dbSDavid S. Miller goto relookup_failed; 395b42835dbSDavid S. Miller 3964c9483b2SDavid S. Miller dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); 397452edd59SDavid S. Miller if (!IS_ERR(dst2)) { 398b42835dbSDavid S. Miller dst_release(dst); 399b42835dbSDavid S. Miller dst = dst2; 400452edd59SDavid S. Miller } else { 401452edd59SDavid S. Miller err = PTR_ERR(dst2); 402452edd59SDavid S. Miller if (err == -EPERM) { 403b42835dbSDavid S. Miller dst_release(dst); 404452edd59SDavid S. Miller return dst2; 405452edd59SDavid S. Miller } else 406b42835dbSDavid S. Miller goto relookup_failed; 407b42835dbSDavid S. Miller } 408b42835dbSDavid S. Miller 409b42835dbSDavid S. Miller relookup_failed: 410b42835dbSDavid S. Miller if (dst) 411b42835dbSDavid S. Miller return dst; 412b42835dbSDavid S. Miller return ERR_PTR(err); 413b42835dbSDavid S. Miller } 414b42835dbSDavid S. Miller 415e1ae5c2eSStephen Suryaputra static struct net_device *icmp6_dev(const struct sk_buff *skb) 4161b70d792SDavid Ahern { 417e1ae5c2eSStephen Suryaputra struct net_device *dev = skb->dev; 4181b70d792SDavid Ahern 4191b70d792SDavid Ahern /* for local traffic to local address, skb dev is the loopback 4201b70d792SDavid Ahern * device. Check if there is a dst attached to the skb and if so 42124b711edSDavid Ahern * get the real device index. Same is needed for replies to a link 42224b711edSDavid Ahern * local address on a device enslaved to an L3 master device 4231b70d792SDavid Ahern */ 424e1ae5c2eSStephen Suryaputra if (unlikely(dev->ifindex == LOOPBACK_IFINDEX || netif_is_l3_master(skb->dev))) { 4251b70d792SDavid Ahern const struct rt6_info *rt6 = skb_rt6_info(skb); 4261b70d792SDavid Ahern 4271b70d792SDavid Ahern if (rt6) 428e1ae5c2eSStephen Suryaputra dev = rt6->rt6i_idev->dev; 4291b70d792SDavid Ahern } 4301b70d792SDavid Ahern 431e1ae5c2eSStephen Suryaputra return dev; 432e1ae5c2eSStephen Suryaputra } 433e1ae5c2eSStephen Suryaputra 434e1ae5c2eSStephen Suryaputra static int icmp6_iif(const struct sk_buff *skb) 435e1ae5c2eSStephen Suryaputra { 436e1ae5c2eSStephen Suryaputra return icmp6_dev(skb)->ifindex; 4371b70d792SDavid Ahern } 4381b70d792SDavid Ahern 4391da177e4SLinus Torvalds /* 4401da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 4411da177e4SLinus Torvalds */ 442cc7a21b6SEric Dumazet void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info, 443ee576c47SJason A. Donenfeld const struct in6_addr *force_saddr, 444ee576c47SJason A. Donenfeld const struct inet6_skb_parm *parm) 4451da177e4SLinus Torvalds { 4461da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 4470660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 44884427d53SYOSHIFUJI Hideaki struct sock *sk; 4498d933670SEric Dumazet struct net *net; 45084427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 451b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 4521da177e4SLinus Torvalds struct dst_entry *dst; 4531da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 4544c9483b2SDavid S. Miller struct flowi6 fl6; 4551da177e4SLinus Torvalds struct icmpv6_msg msg; 45626879da5SWei Wang struct ipcm6_cookie ipc6; 4571da177e4SLinus Torvalds int iif = 0; 4581da177e4SLinus Torvalds int addr_type = 0; 4591da177e4SLinus Torvalds int len; 4608d933670SEric Dumazet u32 mark; 4611da177e4SLinus Torvalds 46227a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 46329a3cad5SSimon Horman (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb)) 4641da177e4SLinus Torvalds return; 4651da177e4SLinus Torvalds 4668d933670SEric Dumazet if (!skb->dev) 4678d933670SEric Dumazet return; 4688d933670SEric Dumazet net = dev_net(skb->dev); 4698d933670SEric Dumazet mark = IP6_REPLY_MARK(net, skb->mark); 4701da177e4SLinus Torvalds /* 4711da177e4SLinus Torvalds * Make sure we respect the rules 4721da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 4735f5624cfSPravin B Shelar * Rule (e.1) is enforced by not using icmp6_send 4741da177e4SLinus Torvalds * in any code that processes icmp errors. 4751da177e4SLinus Torvalds */ 4761da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 4771da177e4SLinus Torvalds 478446fab59SFX Le Bail if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) || 479d94c1f92SFX Le Bail ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr)) 4801da177e4SLinus Torvalds saddr = &hdr->daddr; 4811da177e4SLinus Torvalds 4821da177e4SLinus Torvalds /* 4831da177e4SLinus Torvalds * Dest addr check 4841da177e4SLinus Torvalds */ 4851da177e4SLinus Torvalds 4869a6b4b39Szhuyj if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) { 4871da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 4881da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 4891da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 4901da177e4SLinus Torvalds (opt_unrec(skb, info)))) 4911da177e4SLinus Torvalds return; 4921da177e4SLinus Torvalds 4931da177e4SLinus Torvalds saddr = NULL; 4941da177e4SLinus Torvalds } 4951da177e4SLinus Torvalds 4961da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 4971da177e4SLinus Torvalds 4981da177e4SLinus Torvalds /* 4991da177e4SLinus Torvalds * Source addr check 5001da177e4SLinus Torvalds */ 5011da177e4SLinus Torvalds 5024832c30dSDavid Ahern if (__ipv6_addr_needs_scope_id(addr_type)) { 5031b70d792SDavid Ahern iif = icmp6_iif(skb); 5044832c30dSDavid Ahern } else { 505272928d1SMathieu Desnoyers /* 506272928d1SMathieu Desnoyers * The source device is used for looking up which routing table 507272928d1SMathieu Desnoyers * to use for sending an ICMP error. 508272928d1SMathieu Desnoyers */ 509272928d1SMathieu Desnoyers iif = l3mdev_master_ifindex(skb->dev); 51079dc7e3fSDavid Ahern } 5111da177e4SLinus Torvalds 5121da177e4SLinus Torvalds /* 5138de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 5148de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 5158de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 5168de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 5171da177e4SLinus Torvalds */ 5181da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 5194b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n", 5204b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5211da177e4SLinus Torvalds return; 5221da177e4SLinus Torvalds } 5231da177e4SLinus Torvalds 5241da177e4SLinus Torvalds /* 5251da177e4SLinus Torvalds * Never answer to a ICMP packet. 5261da177e4SLinus Torvalds */ 5271da177e4SLinus Torvalds if (is_ineligible(skb)) { 5284b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n", 5294b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5301da177e4SLinus Torvalds return; 5311da177e4SLinus Torvalds } 5321da177e4SLinus Torvalds 5337ba91ecbSJesper Dangaard Brouer /* Needed by both icmp_global_allow and icmpv6_xmit_lock */ 5347ba91ecbSJesper Dangaard Brouer local_bh_disable(); 5357ba91ecbSJesper Dangaard Brouer 5367ba91ecbSJesper Dangaard Brouer /* Check global sysctl_icmp_msgs_per_sec ratelimit */ 5370bc19985SStephen Suryaputra if (!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, type)) 5387ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 5397ba91ecbSJesper Dangaard Brouer 540ee576c47SJason A. Donenfeld mip6_addr_swap(skb, parm); 54179383236SMasahide NAKAMURA 542fac6fce9SFrancesco Ruggeri sk = icmpv6_xmit_lock(net); 543fac6fce9SFrancesco Ruggeri if (!sk) 544fac6fce9SFrancesco Ruggeri goto out_bh_enable; 545fac6fce9SFrancesco Ruggeri 5464c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 5474c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 5484e3fd7a0SAlexey Dobriyan fl6.daddr = hdr->saddr; 549b1cadc1aSEric Dumazet if (force_saddr) 550b1cadc1aSEric Dumazet saddr = force_saddr; 551fac6fce9SFrancesco Ruggeri if (saddr) { 5524e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 553b93cfb9cSTim Stallard } else if (!icmpv6_rt_has_prefsrc(sk, type, &fl6)) { 554fac6fce9SFrancesco Ruggeri /* select a more meaningful saddr from input if */ 555fac6fce9SFrancesco Ruggeri struct net_device *in_netdev; 556fac6fce9SFrancesco Ruggeri 557ee576c47SJason A. Donenfeld in_netdev = dev_get_by_index(net, parm->iif); 558fac6fce9SFrancesco Ruggeri if (in_netdev) { 559fac6fce9SFrancesco Ruggeri ipv6_dev_get_saddr(net, in_netdev, &fl6.daddr, 560fac6fce9SFrancesco Ruggeri inet6_sk(sk)->srcprefs, 561fac6fce9SFrancesco Ruggeri &fl6.saddr); 562fac6fce9SFrancesco Ruggeri dev_put(in_netdev); 563fac6fce9SFrancesco Ruggeri } 564fac6fce9SFrancesco Ruggeri } 565e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 5664c9483b2SDavid S. Miller fl6.flowi6_oif = iif; 5671958b856SDavid S. Miller fl6.fl6_icmp_type = type; 5681958b856SDavid S. Miller fl6.fl6_icmp_code = code; 569e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 570b4bac172SDavid Ahern fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, NULL); 5713df98d79SPaul Moore security_skb_classify_flow(skb, flowi6_to_flowi_common(&fl6)); 5721da177e4SLinus Torvalds 573fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 574405666dbSDenis V. Lunev 5754c9483b2SDavid S. Miller if (!icmpv6_xrlim_allow(sk, type, &fl6)) 5761da177e4SLinus Torvalds goto out; 5771da177e4SLinus Torvalds 5781da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 5791da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 5801da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 5811da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 5821da177e4SLinus Torvalds 5834c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 5844c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 585c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 586c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 5871da177e4SLinus Torvalds 588b515430aSWillem de Bruijn ipcm6_init_sk(&ipc6, np); 5890da7536fSWillem de Bruijn ipc6.sockc.mark = mark; 59038b7097bSHannes Frederic Sowa fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 59138b7097bSHannes Frederic Sowa 5924c9483b2SDavid S. Miller dst = icmpv6_route_lookup(net, skb, sk, &fl6); 593b42835dbSDavid S. Miller if (IS_ERR(dst)) 5941da177e4SLinus Torvalds goto out; 5958de3351eSYOSHIFUJI Hideaki 59626879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 5971da177e4SLinus Torvalds 5981da177e4SLinus Torvalds msg.skb = skb; 599bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 600763ecff1SYasuyuki Kozakai msg.type = type; 6011da177e4SLinus Torvalds 6021da177e4SLinus Torvalds len = skb->len - msg.offset; 6031da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); 6041da177e4SLinus Torvalds if (len < 0) { 6054b3418fbSBjørn Mork net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n", 6064b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 6071da177e4SLinus Torvalds goto out_dst_release; 6081da177e4SLinus Torvalds } 6091da177e4SLinus Torvalds 610cfdf7647SEric Dumazet rcu_read_lock(); 611cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 6121da177e4SLinus Torvalds 6134e64b1edSJoe Perches if (ip6_append_data(sk, icmpv6_getfrag, &msg, 6141da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 61526879da5SWei Wang sizeof(struct icmp6hdr), 61626879da5SWei Wang &ipc6, &fl6, (struct rt6_info *)dst, 6175fdaa88dSWillem de Bruijn MSG_DONTWAIT)) { 61843a43b60SHannes Frederic Sowa ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 6191da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 620cfdf7647SEric Dumazet } else { 6214e64b1edSJoe Perches icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 622cfdf7647SEric Dumazet len + sizeof(struct icmp6hdr)); 6231da177e4SLinus Torvalds } 624cfdf7647SEric Dumazet rcu_read_unlock(); 6251da177e4SLinus Torvalds out_dst_release: 6261da177e4SLinus Torvalds dst_release(dst); 6271da177e4SLinus Torvalds out: 628405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 6297ba91ecbSJesper Dangaard Brouer out_bh_enable: 6307ba91ecbSJesper Dangaard Brouer local_bh_enable(); 6311da177e4SLinus Torvalds } 632cc7a21b6SEric Dumazet EXPORT_SYMBOL(icmp6_send); 6335f5624cfSPravin B Shelar 6341ad6d548SMenglong Dong /* Slightly more convenient version of icmp6_send with drop reasons. 6355f5624cfSPravin B Shelar */ 6361ad6d548SMenglong Dong void icmpv6_param_prob_reason(struct sk_buff *skb, u8 code, int pos, 6371ad6d548SMenglong Dong enum skb_drop_reason reason) 6385f5624cfSPravin B Shelar { 639ee576c47SJason A. Donenfeld icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL, IP6CB(skb)); 6401ad6d548SMenglong Dong kfree_skb_reason(skb, reason); 6415f5624cfSPravin B Shelar } 6427159039aSYOSHIFUJI Hideaki 6435fbba8acSEric Dumazet /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH 6445fbba8acSEric Dumazet * if sufficient data bytes are available 6455fbba8acSEric Dumazet * @nhs is the size of the tunnel header(s) : 6465fbba8acSEric Dumazet * Either an IPv4 header for SIT encap 6475fbba8acSEric Dumazet * an IPv4 header + GRE header for GRE encap 6485fbba8acSEric Dumazet */ 64920e1954fSEric Dumazet int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type, 65020e1954fSEric Dumazet unsigned int data_len) 6515fbba8acSEric Dumazet { 6522d7a3b27SEric Dumazet struct in6_addr temp_saddr; 6535fbba8acSEric Dumazet struct rt6_info *rt; 6545fbba8acSEric Dumazet struct sk_buff *skb2; 65520e1954fSEric Dumazet u32 info = 0; 6565fbba8acSEric Dumazet 6575fbba8acSEric Dumazet if (!pskb_may_pull(skb, nhs + sizeof(struct ipv6hdr) + 8)) 6585fbba8acSEric Dumazet return 1; 6595fbba8acSEric Dumazet 66020e1954fSEric Dumazet /* RFC 4884 (partial) support for ICMP extensions */ 66120e1954fSEric Dumazet if (data_len < 128 || (data_len & 7) || skb->len < data_len) 66220e1954fSEric Dumazet data_len = 0; 66320e1954fSEric Dumazet 66420e1954fSEric Dumazet skb2 = data_len ? skb_copy(skb, GFP_ATOMIC) : skb_clone(skb, GFP_ATOMIC); 6655fbba8acSEric Dumazet 6665fbba8acSEric Dumazet if (!skb2) 6675fbba8acSEric Dumazet return 1; 6685fbba8acSEric Dumazet 6695fbba8acSEric Dumazet skb_dst_drop(skb2); 6705fbba8acSEric Dumazet skb_pull(skb2, nhs); 6715fbba8acSEric Dumazet skb_reset_network_header(skb2); 6725fbba8acSEric Dumazet 673b75cc8f9SDavid Ahern rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 674b75cc8f9SDavid Ahern skb, 0); 6755fbba8acSEric Dumazet 6765fbba8acSEric Dumazet if (rt && rt->dst.dev) 6775fbba8acSEric Dumazet skb2->dev = rt->dst.dev; 6785fbba8acSEric Dumazet 6792d7a3b27SEric Dumazet ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr); 68020e1954fSEric Dumazet 68120e1954fSEric Dumazet if (data_len) { 68220e1954fSEric Dumazet /* RFC 4884 (partial) support : 68320e1954fSEric Dumazet * insert 0 padding at the end, before the extensions 68420e1954fSEric Dumazet */ 68520e1954fSEric Dumazet __skb_push(skb2, nhs); 68620e1954fSEric Dumazet skb_reset_network_header(skb2); 68720e1954fSEric Dumazet memmove(skb2->data, skb2->data + nhs, data_len - nhs); 68820e1954fSEric Dumazet memset(skb2->data + data_len - nhs, 0, nhs); 68920e1954fSEric Dumazet /* RFC 4884 4.5 : Length is measured in 64-bit words, 69020e1954fSEric Dumazet * and stored in reserved[0] 69120e1954fSEric Dumazet */ 69220e1954fSEric Dumazet info = (data_len/8) << 24; 69320e1954fSEric Dumazet } 6942d7a3b27SEric Dumazet if (type == ICMP_TIME_EXCEEDED) 6952d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 696ee576c47SJason A. Donenfeld info, &temp_saddr, IP6CB(skb2)); 6972d7a3b27SEric Dumazet else 6982d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 699ee576c47SJason A. Donenfeld info, &temp_saddr, IP6CB(skb2)); 7005fbba8acSEric Dumazet if (rt) 7015fbba8acSEric Dumazet ip6_rt_put(rt); 7025fbba8acSEric Dumazet 7035fbba8acSEric Dumazet kfree_skb(skb2); 7045fbba8acSEric Dumazet 7055fbba8acSEric Dumazet return 0; 7065fbba8acSEric Dumazet } 7075fbba8acSEric Dumazet EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach); 7085fbba8acSEric Dumazet 709ac03694bSEric Dumazet static enum skb_drop_reason icmpv6_echo_reply(struct sk_buff *skb) 7101da177e4SLinus Torvalds { 711c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 71284427d53SYOSHIFUJI Hideaki struct sock *sk; 7131da177e4SLinus Torvalds struct inet6_dev *idev; 71484427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 715b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 716cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 7171da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 7184c9483b2SDavid S. Miller struct flowi6 fl6; 7191da177e4SLinus Torvalds struct icmpv6_msg msg; 7201da177e4SLinus Torvalds struct dst_entry *dst; 72126879da5SWei Wang struct ipcm6_cookie ipc6; 722e110861fSLorenzo Colitti u32 mark = IP6_REPLY_MARK(net, skb->mark); 723ac03694bSEric Dumazet SKB_DR(reason); 7240b03a5caSStephen Suryaputra bool acast; 7251fd07f33SAndreas Roeseler u8 type; 7261da177e4SLinus Torvalds 72703f1ecccSStephen Suryaputra if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) && 72803f1ecccSStephen Suryaputra net->ipv6.sysctl.icmpv6_echo_ignore_multicast) 729ac03694bSEric Dumazet return reason; 73003f1ecccSStephen Suryaputra 7310660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 7321da177e4SLinus Torvalds 7330b03a5caSStephen Suryaputra acast = ipv6_anycast_destination(skb_dst(skb), saddr); 7340b03a5caSStephen Suryaputra if (acast && net->ipv6.sysctl.icmpv6_echo_ignore_anycast) 735ac03694bSEric Dumazet return reason; 7360b03a5caSStephen Suryaputra 737509aba3bSFX Le Bail if (!ipv6_unicast_destination(skb) && 7380b03a5caSStephen Suryaputra !(net->ipv6.sysctl.anycast_src_echo_reply && acast)) 7391da177e4SLinus Torvalds saddr = NULL; 7401da177e4SLinus Torvalds 7411fd07f33SAndreas Roeseler if (icmph->icmp6_type == ICMPV6_EXT_ECHO_REQUEST) 7421fd07f33SAndreas Roeseler type = ICMPV6_EXT_ECHO_REPLY; 7431fd07f33SAndreas Roeseler else 7441fd07f33SAndreas Roeseler type = ICMPV6_ECHO_REPLY; 7451fd07f33SAndreas Roeseler 7461da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 7471fd07f33SAndreas Roeseler tmp_hdr.icmp6_type = type; 7481da177e4SLinus Torvalds 7494c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 750a346abe0SEric Dumazet if (net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES) 751a346abe0SEric Dumazet fl6.flowlabel = ip6_flowlabel(ipv6_hdr(skb)); 752a346abe0SEric Dumazet 7534c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 7544e3fd7a0SAlexey Dobriyan fl6.daddr = ipv6_hdr(skb)->saddr; 7551da177e4SLinus Torvalds if (saddr) 7564e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 7571b70d792SDavid Ahern fl6.flowi6_oif = icmp6_iif(skb); 7581fd07f33SAndreas Roeseler fl6.fl6_icmp_type = type; 759e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 760e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 7613df98d79SPaul Moore security_skb_classify_flow(skb, flowi6_to_flowi_common(&fl6)); 7621da177e4SLinus Torvalds 7637ba91ecbSJesper Dangaard Brouer local_bh_disable(); 764fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 76563159f29SIan Morris if (!sk) 7667ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 767fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 768405666dbSDenis V. Lunev 7694c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 7704c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 771c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 772c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 7731da177e4SLinus Torvalds 7744e64b1edSJoe Perches if (ip6_dst_lookup(net, sk, &dst, &fl6)) 7751da177e4SLinus Torvalds goto out; 7764c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); 777452edd59SDavid S. Miller if (IS_ERR(dst)) 778e104411bSPatrick McHardy goto out; 7791da177e4SLinus Torvalds 7800bc19985SStephen Suryaputra /* Check the ratelimit */ 7810bc19985SStephen Suryaputra if ((!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, ICMPV6_ECHO_REPLY)) || 7820bc19985SStephen Suryaputra !icmpv6_xrlim_allow(sk, ICMPV6_ECHO_REPLY, &fl6)) 7830bc19985SStephen Suryaputra goto out_dst_release; 7840bc19985SStephen Suryaputra 785cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 7861da177e4SLinus Torvalds 7871da177e4SLinus Torvalds msg.skb = skb; 7881da177e4SLinus Torvalds msg.offset = 0; 7891fd07f33SAndreas Roeseler msg.type = type; 7901da177e4SLinus Torvalds 791b515430aSWillem de Bruijn ipcm6_init_sk(&ipc6, np); 79226879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 79326879da5SWei Wang ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 7940da7536fSWillem de Bruijn ipc6.sockc.mark = mark; 79526879da5SWei Wang 7961fd07f33SAndreas Roeseler if (icmph->icmp6_type == ICMPV6_EXT_ECHO_REQUEST) 7971fd07f33SAndreas Roeseler if (!icmp_build_probe(skb, (struct icmphdr *)&tmp_hdr)) 7981fd07f33SAndreas Roeseler goto out_dst_release; 7991fd07f33SAndreas Roeseler 8004e64b1edSJoe Perches if (ip6_append_data(sk, icmpv6_getfrag, &msg, 8014e64b1edSJoe Perches skb->len + sizeof(struct icmp6hdr), 80226879da5SWei Wang sizeof(struct icmp6hdr), &ipc6, &fl6, 8035fdaa88dSWillem de Bruijn (struct rt6_info *)dst, MSG_DONTWAIT)) { 804a16292a0SEric Dumazet __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 8051da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 806cfdf7647SEric Dumazet } else { 8074e64b1edSJoe Perches icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 808cfdf7647SEric Dumazet skb->len + sizeof(struct icmp6hdr)); 809ac03694bSEric Dumazet reason = SKB_CONSUMED; 8101da177e4SLinus Torvalds } 8110bc19985SStephen Suryaputra out_dst_release: 8121da177e4SLinus Torvalds dst_release(dst); 8131da177e4SLinus Torvalds out: 814405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 8157ba91ecbSJesper Dangaard Brouer out_bh_enable: 8167ba91ecbSJesper Dangaard Brouer local_bh_enable(); 817ac03694bSEric Dumazet return reason; 8181da177e4SLinus Torvalds } 8191da177e4SLinus Torvalds 82030c89badSEric Dumazet enum skb_drop_reason icmpv6_notify(struct sk_buff *skb, u8 type, 82130c89badSEric Dumazet u8 code, __be32 info) 8221da177e4SLinus Torvalds { 823e4129440SAndrew Lunn struct inet6_skb_parm *opt = IP6CB(skb); 82430c89badSEric Dumazet struct net *net = dev_net(skb->dev); 82541135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 82630c89badSEric Dumazet enum skb_drop_reason reason; 8271da177e4SLinus Torvalds int inner_offset; 82875f2811cSJesse Gross __be16 frag_off; 829f9242b6bSDavid S. Miller u8 nexthdr; 8301da177e4SLinus Torvalds 83130c89badSEric Dumazet reason = pskb_may_pull_reason(skb, sizeof(struct ipv6hdr)); 83230c89badSEric Dumazet if (reason != SKB_NOT_DROPPED_YET) 8337304fe46SDuan Jiong goto out; 8341da177e4SLinus Torvalds 835e4129440SAndrew Lunn seg6_icmp_srh(skb, opt); 836e4129440SAndrew Lunn 8371da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 8381da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 8391da177e4SLinus Torvalds /* now skip over extension headers */ 84075f2811cSJesse Gross inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 84175f2811cSJesse Gross &nexthdr, &frag_off); 84230c89badSEric Dumazet if (inner_offset < 0) { 84330c89badSEric Dumazet SKB_DR_SET(reason, IPV6_BAD_EXTHDR); 8447304fe46SDuan Jiong goto out; 84530c89badSEric Dumazet } 8461da177e4SLinus Torvalds } else { 8471da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 8481da177e4SLinus Torvalds } 8491da177e4SLinus Torvalds 8501da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 85130c89badSEric Dumazet reason = pskb_may_pull_reason(skb, inner_offset + 8); 85230c89badSEric Dumazet if (reason != SKB_NOT_DROPPED_YET) 8537304fe46SDuan Jiong goto out; 8541da177e4SLinus Torvalds 8551da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 8561da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 8571da177e4SLinus Torvalds pmtu discovery. 8581da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 8591da177e4SLinus Torvalds --ANK (980726) 8601da177e4SLinus Torvalds */ 8611da177e4SLinus Torvalds 862f9242b6bSDavid S. Miller ipprot = rcu_dereference(inet6_protos[nexthdr]); 8631da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 864e4129440SAndrew Lunn ipprot->err_handler(skb, opt, type, code, inner_offset, info); 8651da177e4SLinus Torvalds 86669d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 86730c89badSEric Dumazet return SKB_CONSUMED; 8687304fe46SDuan Jiong 8697304fe46SDuan Jiong out: 870a16292a0SEric Dumazet __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); 87130c89badSEric Dumazet return reason; 8721da177e4SLinus Torvalds } 8731da177e4SLinus Torvalds 8741da177e4SLinus Torvalds /* 8751da177e4SLinus Torvalds * Handle icmp messages 8761da177e4SLinus Torvalds */ 8771da177e4SLinus Torvalds 878e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 8791da177e4SLinus Torvalds { 880b384c95aSMenglong Dong enum skb_drop_reason reason = SKB_DROP_REASON_NOT_SPECIFIED; 881e6f86b0fSVirgile Jarry struct net *net = dev_net(skb->dev); 882e1ae5c2eSStephen Suryaputra struct net_device *dev = icmp6_dev(skb); 8831da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 884b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 8851da177e4SLinus Torvalds struct icmp6hdr *hdr; 886d5fdd6baSBrian Haley u8 type; 8871da177e4SLinus Torvalds 888aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 889def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 8908b7817f3SHerbert Xu int nh; 8918b7817f3SHerbert Xu 892def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 893b384c95aSMenglong Dong XFRM_STATE_ICMP)) { 894b384c95aSMenglong Dong reason = SKB_DROP_REASON_XFRM_POLICY; 895aebcf82cSHerbert Xu goto drop_no_count; 896b384c95aSMenglong Dong } 897aebcf82cSHerbert Xu 89881aded24SDavid S. Miller if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) 8998b7817f3SHerbert Xu goto drop_no_count; 9008b7817f3SHerbert Xu 9018b7817f3SHerbert Xu nh = skb_network_offset(skb); 9028b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 9038b7817f3SHerbert Xu 904b384c95aSMenglong Dong if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, 905b384c95aSMenglong Dong skb)) { 906b384c95aSMenglong Dong reason = SKB_DROP_REASON_XFRM_POLICY; 9078b7817f3SHerbert Xu goto drop_no_count; 908b384c95aSMenglong Dong } 9098b7817f3SHerbert Xu 9108b7817f3SHerbert Xu skb_set_network_header(skb, nh); 9118b7817f3SHerbert Xu } 9128b7817f3SHerbert Xu 913a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS); 9141da177e4SLinus Torvalds 9150660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 9160660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 9171da177e4SLinus Torvalds 91839471ac8STom Herbert if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { 919ba7a46f1SJoe Perches net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", 9200c6ce78aSHarvey Harrison saddr, daddr); 9216a5dc9e5SEric Dumazet goto csum_error; 9221da177e4SLinus Torvalds } 9231da177e4SLinus Torvalds 9248cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 9258cf22943SHerbert Xu goto discard_it; 9261da177e4SLinus Torvalds 927cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 9281da177e4SLinus Torvalds 9291da177e4SLinus Torvalds type = hdr->icmp6_type; 9301da177e4SLinus Torvalds 931f3832ed2SEric Dumazet ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type); 9321da177e4SLinus Torvalds 9331da177e4SLinus Torvalds switch (type) { 9341da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 935e6f86b0fSVirgile Jarry if (!net->ipv6.sysctl.icmpv6_echo_ignore_all) 936ac03694bSEric Dumazet reason = icmpv6_echo_reply(skb); 9371da177e4SLinus Torvalds break; 9381fd07f33SAndreas Roeseler case ICMPV6_EXT_ECHO_REQUEST: 9391fd07f33SAndreas Roeseler if (!net->ipv6.sysctl.icmpv6_echo_ignore_all && 9404a2f7083SKuniyuki Iwashima READ_ONCE(net->ipv4.sysctl_icmp_echo_enable_probe)) 941ac03694bSEric Dumazet reason = icmpv6_echo_reply(skb); 9421fd07f33SAndreas Roeseler break; 9431da177e4SLinus Torvalds 9441da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 945b384c95aSMenglong Dong reason = ping_rcv(skb); 9461da177e4SLinus Torvalds break; 9471da177e4SLinus Torvalds 94831433202SAndreas Roeseler case ICMPV6_EXT_ECHO_REPLY: 949b384c95aSMenglong Dong reason = ping_rcv(skb); 95031433202SAndreas Roeseler break; 95131433202SAndreas Roeseler 9521da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 9531da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 9541da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 9551da177e4SLinus Torvalds destination cache will allow to solve this problem 9561da177e4SLinus Torvalds --ANK (980726) 9571da177e4SLinus Torvalds */ 9581da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 9591da177e4SLinus Torvalds goto discard_it; 960cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 9611da177e4SLinus Torvalds 962275757e6SGustavo A. R. Silva /* to notify */ 963a8eceea8SJoe Perches fallthrough; 9641da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 9651da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 9661da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 96730c89badSEric Dumazet reason = icmpv6_notify(skb, type, hdr->icmp6_code, 96830c89badSEric Dumazet hdr->icmp6_mtu); 9691da177e4SLinus Torvalds break; 9701da177e4SLinus Torvalds 9711da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 9721da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 9731da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 9741da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 9751da177e4SLinus Torvalds case NDISC_REDIRECT: 976545dbcd1SEric Dumazet reason = ndisc_rcv(skb); 9771da177e4SLinus Torvalds break; 9781da177e4SLinus Torvalds 9791da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 9801da177e4SLinus Torvalds igmp6_event_query(skb); 981f185de28STaehee Yoo return 0; 9821da177e4SLinus Torvalds 9831da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 9841da177e4SLinus Torvalds igmp6_event_report(skb); 985f185de28STaehee Yoo return 0; 9861da177e4SLinus Torvalds 9871da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 9881da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 9891da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 9901da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 9911da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 9921da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 9931da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 9941da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 9951da177e4SLinus Torvalds break; 9961da177e4SLinus Torvalds 9971da177e4SLinus Torvalds default: 9981da177e4SLinus Torvalds /* informational */ 9991da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 10001da177e4SLinus Torvalds break; 10011da177e4SLinus Torvalds 10024b3418fbSBjørn Mork net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n", 10034b3418fbSBjørn Mork saddr, daddr); 1004ea85a0a2SDavid S. Miller 10051da177e4SLinus Torvalds /* 10061da177e4SLinus Torvalds * error of unknown type. 10071da177e4SLinus Torvalds * must pass to upper level 10081da177e4SLinus Torvalds */ 10091da177e4SLinus Torvalds 101030c89badSEric Dumazet reason = icmpv6_notify(skb, type, hdr->icmp6_code, 101130c89badSEric Dumazet hdr->icmp6_mtu); 10123ff50b79SStephen Hemminger } 10133ff50b79SStephen Hemminger 1014e3e32170SRick Jones /* until the v6 path can be better sorted assume failure and 1015e3e32170SRick Jones * preserve the status quo behaviour for the rest of the paths to here 1016e3e32170SRick Jones */ 1017b384c95aSMenglong Dong if (reason) 1018b384c95aSMenglong Dong kfree_skb_reason(skb, reason); 1019e3e32170SRick Jones else 1020b384c95aSMenglong Dong consume_skb(skb); 1021e3e32170SRick Jones 10221da177e4SLinus Torvalds return 0; 10231da177e4SLinus Torvalds 10246a5dc9e5SEric Dumazet csum_error: 1025b384c95aSMenglong Dong reason = SKB_DROP_REASON_ICMP_CSUM; 1026a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); 10271da177e4SLinus Torvalds discard_it: 1028a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS); 10298b7817f3SHerbert Xu drop_no_count: 1030b384c95aSMenglong Dong kfree_skb_reason(skb, reason); 10311da177e4SLinus Torvalds return 0; 10321da177e4SLinus Torvalds } 10331da177e4SLinus Torvalds 10344c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, 103595e41e93SYOSHIFUJI Hideaki u8 type, 103695e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 103795e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 103895e41e93SYOSHIFUJI Hideaki int oif) 103995e41e93SYOSHIFUJI Hideaki { 10404c9483b2SDavid S. Miller memset(fl6, 0, sizeof(*fl6)); 10414e3fd7a0SAlexey Dobriyan fl6->saddr = *saddr; 10424e3fd7a0SAlexey Dobriyan fl6->daddr = *daddr; 10434c9483b2SDavid S. Miller fl6->flowi6_proto = IPPROTO_ICMPV6; 10441958b856SDavid S. Miller fl6->fl6_icmp_type = type; 10451958b856SDavid S. Miller fl6->fl6_icmp_code = 0; 10464c9483b2SDavid S. Miller fl6->flowi6_oif = oif; 10473df98d79SPaul Moore security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6)); 104895e41e93SYOSHIFUJI Hideaki } 104995e41e93SYOSHIFUJI Hideaki 10506a17b961SEric Dumazet int __init icmpv6_init(void) 10511da177e4SLinus Torvalds { 10521da177e4SLinus Torvalds struct sock *sk; 10533232a1efSKefeng Wang int err, i; 10541da177e4SLinus Torvalds 10556f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 10561ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 10576a17b961SEric Dumazet SOCK_RAW, IPPROTO_ICMPV6, &init_net); 10581da177e4SLinus Torvalds if (err < 0) { 1059f3213831SJoe Perches pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", 10601da177e4SLinus Torvalds err); 10616a17b961SEric Dumazet return err; 10621da177e4SLinus Torvalds } 10631da177e4SLinus Torvalds 10646a17b961SEric Dumazet per_cpu(ipv6_icmp_sk, i) = sk; 10655c8cafd6SDenis V. Lunev 10661da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 10671da177e4SLinus Torvalds * sk_buff struct overhead. 10681da177e4SLinus Torvalds */ 106987fb4b7bSEric Dumazet sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); 10701da177e4SLinus Torvalds } 107198c6d1b2SDenis V. Lunev 107298c6d1b2SDenis V. Lunev err = -EAGAIN; 107398c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 107498c6d1b2SDenis V. Lunev goto fail; 10755f5624cfSPravin B Shelar 10765f5624cfSPravin B Shelar err = inet6_register_icmp_sender(icmp6_send); 10775f5624cfSPravin B Shelar if (err) 10785f5624cfSPravin B Shelar goto sender_reg_err; 107998c6d1b2SDenis V. Lunev return 0; 108098c6d1b2SDenis V. Lunev 10815f5624cfSPravin B Shelar sender_reg_err: 10825f5624cfSPravin B Shelar inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 108398c6d1b2SDenis V. Lunev fail: 1084f3213831SJoe Perches pr_err("Failed to register ICMP6 protocol\n"); 108598c6d1b2SDenis V. Lunev return err; 108698c6d1b2SDenis V. Lunev } 108798c6d1b2SDenis V. Lunev 10888ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 108998c6d1b2SDenis V. Lunev { 10905f5624cfSPravin B Shelar inet6_unregister_icmp_sender(icmp6_send); 10911da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 10921da177e4SLinus Torvalds } 10931da177e4SLinus Torvalds 109498c6d1b2SDenis V. Lunev 10959b5b5cffSArjan van de Ven static const struct icmp6_err { 10961da177e4SLinus Torvalds int err; 10971da177e4SLinus Torvalds int fatal; 10981da177e4SLinus Torvalds } tab_unreach[] = { 10991da177e4SLinus Torvalds { /* NOROUTE */ 11001da177e4SLinus Torvalds .err = ENETUNREACH, 11011da177e4SLinus Torvalds .fatal = 0, 11021da177e4SLinus Torvalds }, 11031da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 11041da177e4SLinus Torvalds .err = EACCES, 11051da177e4SLinus Torvalds .fatal = 1, 11061da177e4SLinus Torvalds }, 11071da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 11081da177e4SLinus Torvalds .err = EHOSTUNREACH, 11091da177e4SLinus Torvalds .fatal = 0, 11101da177e4SLinus Torvalds }, 11111da177e4SLinus Torvalds { /* ADDR_UNREACH */ 11121da177e4SLinus Torvalds .err = EHOSTUNREACH, 11131da177e4SLinus Torvalds .fatal = 0, 11141da177e4SLinus Torvalds }, 11151da177e4SLinus Torvalds { /* PORT_UNREACH */ 11161da177e4SLinus Torvalds .err = ECONNREFUSED, 11171da177e4SLinus Torvalds .fatal = 1, 11181da177e4SLinus Torvalds }, 111961e76b17SJiri Bohac { /* POLICY_FAIL */ 112061e76b17SJiri Bohac .err = EACCES, 112161e76b17SJiri Bohac .fatal = 1, 112261e76b17SJiri Bohac }, 112361e76b17SJiri Bohac { /* REJECT_ROUTE */ 112461e76b17SJiri Bohac .err = EACCES, 112561e76b17SJiri Bohac .fatal = 1, 112661e76b17SJiri Bohac }, 11271da177e4SLinus Torvalds }; 11281da177e4SLinus Torvalds 1129d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 11301da177e4SLinus Torvalds { 11311da177e4SLinus Torvalds int fatal = 0; 11321da177e4SLinus Torvalds 11331da177e4SLinus Torvalds *err = EPROTO; 11341da177e4SLinus Torvalds 11351da177e4SLinus Torvalds switch (type) { 11361da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 11371da177e4SLinus Torvalds fatal = 1; 113861e76b17SJiri Bohac if (code < ARRAY_SIZE(tab_unreach)) { 11391da177e4SLinus Torvalds *err = tab_unreach[code].err; 11401da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 11411da177e4SLinus Torvalds } 11421da177e4SLinus Torvalds break; 11431da177e4SLinus Torvalds 11441da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 11451da177e4SLinus Torvalds *err = EMSGSIZE; 11461da177e4SLinus Torvalds break; 11471da177e4SLinus Torvalds 11481da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 11491da177e4SLinus Torvalds *err = EPROTO; 11501da177e4SLinus Torvalds fatal = 1; 11511da177e4SLinus Torvalds break; 11521da177e4SLinus Torvalds 11531da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 11541da177e4SLinus Torvalds *err = EHOSTUNREACH; 11551da177e4SLinus Torvalds break; 11563ff50b79SStephen Hemminger } 11571da177e4SLinus Torvalds 11581da177e4SLinus Torvalds return fatal; 11591da177e4SLinus Torvalds } 11607159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 11617159039aSYOSHIFUJI Hideaki 11621da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 1163e8243534Sstephen hemminger static struct ctl_table ipv6_icmp_table_template[] = { 11641da177e4SLinus Torvalds { 11651da177e4SLinus Torvalds .procname = "ratelimit", 116641a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 11671da177e4SLinus Torvalds .maxlen = sizeof(int), 11681da177e4SLinus Torvalds .mode = 0644, 11696d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 11701da177e4SLinus Torvalds }, 1171e6f86b0fSVirgile Jarry { 1172e6f86b0fSVirgile Jarry .procname = "echo_ignore_all", 1173e6f86b0fSVirgile Jarry .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_all, 1174a6175633SEric Dumazet .maxlen = sizeof(u8), 1175e6f86b0fSVirgile Jarry .mode = 0644, 1176a6175633SEric Dumazet .proc_handler = proc_dou8vec_minmax, 1177e6f86b0fSVirgile Jarry }, 117803f1ecccSStephen Suryaputra { 117903f1ecccSStephen Suryaputra .procname = "echo_ignore_multicast", 118003f1ecccSStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_multicast, 1181a6175633SEric Dumazet .maxlen = sizeof(u8), 118203f1ecccSStephen Suryaputra .mode = 0644, 1183a6175633SEric Dumazet .proc_handler = proc_dou8vec_minmax, 118403f1ecccSStephen Suryaputra }, 11850b03a5caSStephen Suryaputra { 11860b03a5caSStephen Suryaputra .procname = "echo_ignore_anycast", 11870b03a5caSStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_anycast, 1188a6175633SEric Dumazet .maxlen = sizeof(u8), 11890b03a5caSStephen Suryaputra .mode = 0644, 1190a6175633SEric Dumazet .proc_handler = proc_dou8vec_minmax, 11910b03a5caSStephen Suryaputra }, 11920bc19985SStephen Suryaputra { 11930bc19985SStephen Suryaputra .procname = "ratemask", 11940bc19985SStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_ratemask_ptr, 11950bc19985SStephen Suryaputra .maxlen = ICMPV6_MSG_MAX + 1, 11960bc19985SStephen Suryaputra .mode = 0644, 11970bc19985SStephen Suryaputra .proc_handler = proc_do_large_bitmap, 11980bc19985SStephen Suryaputra }, 1199*7ab75456SMahesh Bandewar { 1200*7ab75456SMahesh Bandewar .procname = "error_anycast_as_unicast", 1201*7ab75456SMahesh Bandewar .data = &init_net.ipv6.sysctl.icmpv6_error_anycast_as_unicast, 1202*7ab75456SMahesh Bandewar .maxlen = sizeof(u8), 1203*7ab75456SMahesh Bandewar .mode = 0644, 1204*7ab75456SMahesh Bandewar .proc_handler = proc_dou8vec_minmax, 1205*7ab75456SMahesh Bandewar .extra1 = SYSCTL_ZERO, 1206*7ab75456SMahesh Bandewar .extra2 = SYSCTL_ONE, 1207*7ab75456SMahesh Bandewar }, 1208f8572d8fSEric W. Biederman { }, 12091da177e4SLinus Torvalds }; 1210760f2d01SDaniel Lezcano 12112c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 1212760f2d01SDaniel Lezcano { 1213760f2d01SDaniel Lezcano struct ctl_table *table; 1214760f2d01SDaniel Lezcano 1215760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 1216760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 1217760f2d01SDaniel Lezcano GFP_KERNEL); 12185ee09105SYOSHIFUJI Hideaki 1219e6f86b0fSVirgile Jarry if (table) { 12205ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 1221e6f86b0fSVirgile Jarry table[1].data = &net->ipv6.sysctl.icmpv6_echo_ignore_all; 122203f1ecccSStephen Suryaputra table[2].data = &net->ipv6.sysctl.icmpv6_echo_ignore_multicast; 12230b03a5caSStephen Suryaputra table[3].data = &net->ipv6.sysctl.icmpv6_echo_ignore_anycast; 12240bc19985SStephen Suryaputra table[4].data = &net->ipv6.sysctl.icmpv6_ratemask_ptr; 1225*7ab75456SMahesh Bandewar table[5].data = &net->ipv6.sysctl.icmpv6_error_anycast_as_unicast; 1226e6f86b0fSVirgile Jarry } 1227760f2d01SDaniel Lezcano return table; 1228760f2d01SDaniel Lezcano } 12291da177e4SLinus Torvalds #endif 1230