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 365b42835dbSDavid S. Miller * anycast. 366b42835dbSDavid S. Miller */ 3672647a9b0SMartin KaFai Lau if (ipv6_anycast_destination(dst, &fl6->daddr)) { 368ba7a46f1SJoe Perches net_dbg_ratelimited("icmp6_send: acast source\n"); 369b42835dbSDavid S. Miller dst_release(dst); 370b42835dbSDavid S. Miller return ERR_PTR(-EINVAL); 371b42835dbSDavid S. Miller } 372b42835dbSDavid S. Miller 373b42835dbSDavid S. Miller /* No need to clone since we're just using its address. */ 374b42835dbSDavid S. Miller dst2 = dst; 375b42835dbSDavid S. Miller 3764c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); 377452edd59SDavid S. Miller if (!IS_ERR(dst)) { 378b42835dbSDavid S. Miller if (dst != dst2) 379b42835dbSDavid S. Miller return dst; 380452edd59SDavid S. Miller } else { 381452edd59SDavid S. Miller if (PTR_ERR(dst) == -EPERM) 382b42835dbSDavid S. Miller dst = NULL; 383452edd59SDavid S. Miller else 384452edd59SDavid S. Miller return dst; 385b42835dbSDavid S. Miller } 386b42835dbSDavid S. Miller 3874c9483b2SDavid S. Miller err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); 388b42835dbSDavid S. Miller if (err) 389b42835dbSDavid S. Miller goto relookup_failed; 390b42835dbSDavid S. Miller 391343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst2, &fl2); 392b42835dbSDavid S. Miller if (err) 393b42835dbSDavid S. Miller goto relookup_failed; 394b42835dbSDavid S. Miller 3954c9483b2SDavid S. Miller dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); 396452edd59SDavid S. Miller if (!IS_ERR(dst2)) { 397b42835dbSDavid S. Miller dst_release(dst); 398b42835dbSDavid S. Miller dst = dst2; 399452edd59SDavid S. Miller } else { 400452edd59SDavid S. Miller err = PTR_ERR(dst2); 401452edd59SDavid S. Miller if (err == -EPERM) { 402b42835dbSDavid S. Miller dst_release(dst); 403452edd59SDavid S. Miller return dst2; 404452edd59SDavid S. Miller } else 405b42835dbSDavid S. Miller goto relookup_failed; 406b42835dbSDavid S. Miller } 407b42835dbSDavid S. Miller 408b42835dbSDavid S. Miller relookup_failed: 409b42835dbSDavid S. Miller if (dst) 410b42835dbSDavid S. Miller return dst; 411b42835dbSDavid S. Miller return ERR_PTR(err); 412b42835dbSDavid S. Miller } 413b42835dbSDavid S. Miller 414e1ae5c2eSStephen Suryaputra static struct net_device *icmp6_dev(const struct sk_buff *skb) 4151b70d792SDavid Ahern { 416e1ae5c2eSStephen Suryaputra struct net_device *dev = skb->dev; 4171b70d792SDavid Ahern 4181b70d792SDavid Ahern /* for local traffic to local address, skb dev is the loopback 4191b70d792SDavid Ahern * device. Check if there is a dst attached to the skb and if so 42024b711edSDavid Ahern * get the real device index. Same is needed for replies to a link 42124b711edSDavid Ahern * local address on a device enslaved to an L3 master device 4221b70d792SDavid Ahern */ 423e1ae5c2eSStephen Suryaputra if (unlikely(dev->ifindex == LOOPBACK_IFINDEX || netif_is_l3_master(skb->dev))) { 4241b70d792SDavid Ahern const struct rt6_info *rt6 = skb_rt6_info(skb); 4251b70d792SDavid Ahern 4261b70d792SDavid Ahern if (rt6) 427e1ae5c2eSStephen Suryaputra dev = rt6->rt6i_idev->dev; 4281b70d792SDavid Ahern } 4291b70d792SDavid Ahern 430e1ae5c2eSStephen Suryaputra return dev; 431e1ae5c2eSStephen Suryaputra } 432e1ae5c2eSStephen Suryaputra 433e1ae5c2eSStephen Suryaputra static int icmp6_iif(const struct sk_buff *skb) 434e1ae5c2eSStephen Suryaputra { 435e1ae5c2eSStephen Suryaputra return icmp6_dev(skb)->ifindex; 4361b70d792SDavid Ahern } 4371b70d792SDavid Ahern 4381da177e4SLinus Torvalds /* 4391da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 4401da177e4SLinus Torvalds */ 441cc7a21b6SEric Dumazet void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info, 442ee576c47SJason A. Donenfeld const struct in6_addr *force_saddr, 443ee576c47SJason A. Donenfeld const struct inet6_skb_parm *parm) 4441da177e4SLinus Torvalds { 4451da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 4460660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 44784427d53SYOSHIFUJI Hideaki struct sock *sk; 4488d933670SEric Dumazet struct net *net; 44984427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 450b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 4511da177e4SLinus Torvalds struct dst_entry *dst; 4521da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 4534c9483b2SDavid S. Miller struct flowi6 fl6; 4541da177e4SLinus Torvalds struct icmpv6_msg msg; 45526879da5SWei Wang struct ipcm6_cookie ipc6; 4561da177e4SLinus Torvalds int iif = 0; 4571da177e4SLinus Torvalds int addr_type = 0; 4581da177e4SLinus Torvalds int len; 4598d933670SEric Dumazet u32 mark; 4601da177e4SLinus Torvalds 46127a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 46229a3cad5SSimon Horman (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb)) 4631da177e4SLinus Torvalds return; 4641da177e4SLinus Torvalds 4658d933670SEric Dumazet if (!skb->dev) 4668d933670SEric Dumazet return; 4678d933670SEric Dumazet net = dev_net(skb->dev); 4688d933670SEric Dumazet mark = IP6_REPLY_MARK(net, skb->mark); 4691da177e4SLinus Torvalds /* 4701da177e4SLinus Torvalds * Make sure we respect the rules 4711da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 4725f5624cfSPravin B Shelar * Rule (e.1) is enforced by not using icmp6_send 4731da177e4SLinus Torvalds * in any code that processes icmp errors. 4741da177e4SLinus Torvalds */ 4751da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 4761da177e4SLinus Torvalds 477446fab59SFX Le Bail if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) || 478d94c1f92SFX Le Bail ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr)) 4791da177e4SLinus Torvalds saddr = &hdr->daddr; 4801da177e4SLinus Torvalds 4811da177e4SLinus Torvalds /* 4821da177e4SLinus Torvalds * Dest addr check 4831da177e4SLinus Torvalds */ 4841da177e4SLinus Torvalds 4859a6b4b39Szhuyj if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) { 4861da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 4871da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 4881da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 4891da177e4SLinus Torvalds (opt_unrec(skb, info)))) 4901da177e4SLinus Torvalds return; 4911da177e4SLinus Torvalds 4921da177e4SLinus Torvalds saddr = NULL; 4931da177e4SLinus Torvalds } 4941da177e4SLinus Torvalds 4951da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 4961da177e4SLinus Torvalds 4971da177e4SLinus Torvalds /* 4981da177e4SLinus Torvalds * Source addr check 4991da177e4SLinus Torvalds */ 5001da177e4SLinus Torvalds 5014832c30dSDavid Ahern if (__ipv6_addr_needs_scope_id(addr_type)) { 5021b70d792SDavid Ahern iif = icmp6_iif(skb); 5034832c30dSDavid Ahern } else { 504272928d1SMathieu Desnoyers /* 505272928d1SMathieu Desnoyers * The source device is used for looking up which routing table 506272928d1SMathieu Desnoyers * to use for sending an ICMP error. 507272928d1SMathieu Desnoyers */ 508272928d1SMathieu Desnoyers iif = l3mdev_master_ifindex(skb->dev); 50979dc7e3fSDavid Ahern } 5101da177e4SLinus Torvalds 5111da177e4SLinus Torvalds /* 5128de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 5138de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 5148de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 5158de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 5161da177e4SLinus Torvalds */ 5171da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 5184b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n", 5194b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5201da177e4SLinus Torvalds return; 5211da177e4SLinus Torvalds } 5221da177e4SLinus Torvalds 5231da177e4SLinus Torvalds /* 5241da177e4SLinus Torvalds * Never answer to a ICMP packet. 5251da177e4SLinus Torvalds */ 5261da177e4SLinus Torvalds if (is_ineligible(skb)) { 5274b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n", 5284b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5291da177e4SLinus Torvalds return; 5301da177e4SLinus Torvalds } 5311da177e4SLinus Torvalds 5327ba91ecbSJesper Dangaard Brouer /* Needed by both icmp_global_allow and icmpv6_xmit_lock */ 5337ba91ecbSJesper Dangaard Brouer local_bh_disable(); 5347ba91ecbSJesper Dangaard Brouer 5357ba91ecbSJesper Dangaard Brouer /* Check global sysctl_icmp_msgs_per_sec ratelimit */ 5360bc19985SStephen Suryaputra if (!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, type)) 5377ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 5387ba91ecbSJesper Dangaard Brouer 539ee576c47SJason A. Donenfeld mip6_addr_swap(skb, parm); 54079383236SMasahide NAKAMURA 541fac6fce9SFrancesco Ruggeri sk = icmpv6_xmit_lock(net); 542fac6fce9SFrancesco Ruggeri if (!sk) 543fac6fce9SFrancesco Ruggeri goto out_bh_enable; 544fac6fce9SFrancesco Ruggeri 5454c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 5464c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 5474e3fd7a0SAlexey Dobriyan fl6.daddr = hdr->saddr; 548b1cadc1aSEric Dumazet if (force_saddr) 549b1cadc1aSEric Dumazet saddr = force_saddr; 550fac6fce9SFrancesco Ruggeri if (saddr) { 5514e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 552b93cfb9cSTim Stallard } else if (!icmpv6_rt_has_prefsrc(sk, type, &fl6)) { 553fac6fce9SFrancesco Ruggeri /* select a more meaningful saddr from input if */ 554fac6fce9SFrancesco Ruggeri struct net_device *in_netdev; 555fac6fce9SFrancesco Ruggeri 556ee576c47SJason A. Donenfeld in_netdev = dev_get_by_index(net, parm->iif); 557fac6fce9SFrancesco Ruggeri if (in_netdev) { 558fac6fce9SFrancesco Ruggeri ipv6_dev_get_saddr(net, in_netdev, &fl6.daddr, 559fac6fce9SFrancesco Ruggeri inet6_sk(sk)->srcprefs, 560fac6fce9SFrancesco Ruggeri &fl6.saddr); 561fac6fce9SFrancesco Ruggeri dev_put(in_netdev); 562fac6fce9SFrancesco Ruggeri } 563fac6fce9SFrancesco Ruggeri } 564e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 5654c9483b2SDavid S. Miller fl6.flowi6_oif = iif; 5661958b856SDavid S. Miller fl6.fl6_icmp_type = type; 5671958b856SDavid S. Miller fl6.fl6_icmp_code = code; 568e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 569b4bac172SDavid Ahern fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, NULL); 5703df98d79SPaul Moore security_skb_classify_flow(skb, flowi6_to_flowi_common(&fl6)); 5711da177e4SLinus Torvalds 572fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 573405666dbSDenis V. Lunev 5744c9483b2SDavid S. Miller if (!icmpv6_xrlim_allow(sk, type, &fl6)) 5751da177e4SLinus Torvalds goto out; 5761da177e4SLinus Torvalds 5771da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 5781da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 5791da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 5801da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 5811da177e4SLinus Torvalds 5824c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 5834c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 584c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 585c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 5861da177e4SLinus Torvalds 587b515430aSWillem de Bruijn ipcm6_init_sk(&ipc6, np); 5880da7536fSWillem de Bruijn ipc6.sockc.mark = mark; 58938b7097bSHannes Frederic Sowa fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 59038b7097bSHannes Frederic Sowa 5914c9483b2SDavid S. Miller dst = icmpv6_route_lookup(net, skb, sk, &fl6); 592b42835dbSDavid S. Miller if (IS_ERR(dst)) 5931da177e4SLinus Torvalds goto out; 5948de3351eSYOSHIFUJI Hideaki 59526879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 5961da177e4SLinus Torvalds 5971da177e4SLinus Torvalds msg.skb = skb; 598bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 599763ecff1SYasuyuki Kozakai msg.type = type; 6001da177e4SLinus Torvalds 6011da177e4SLinus Torvalds len = skb->len - msg.offset; 6021da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); 6031da177e4SLinus Torvalds if (len < 0) { 6044b3418fbSBjørn Mork net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n", 6054b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 6061da177e4SLinus Torvalds goto out_dst_release; 6071da177e4SLinus Torvalds } 6081da177e4SLinus Torvalds 609cfdf7647SEric Dumazet rcu_read_lock(); 610cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 6111da177e4SLinus Torvalds 6124e64b1edSJoe Perches if (ip6_append_data(sk, icmpv6_getfrag, &msg, 6131da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 61426879da5SWei Wang sizeof(struct icmp6hdr), 61526879da5SWei Wang &ipc6, &fl6, (struct rt6_info *)dst, 6165fdaa88dSWillem de Bruijn MSG_DONTWAIT)) { 61743a43b60SHannes Frederic Sowa ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 6181da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 619cfdf7647SEric Dumazet } else { 6204e64b1edSJoe Perches icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 621cfdf7647SEric Dumazet len + sizeof(struct icmp6hdr)); 6221da177e4SLinus Torvalds } 623cfdf7647SEric Dumazet rcu_read_unlock(); 6241da177e4SLinus Torvalds out_dst_release: 6251da177e4SLinus Torvalds dst_release(dst); 6261da177e4SLinus Torvalds out: 627405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 6287ba91ecbSJesper Dangaard Brouer out_bh_enable: 6297ba91ecbSJesper Dangaard Brouer local_bh_enable(); 6301da177e4SLinus Torvalds } 631cc7a21b6SEric Dumazet EXPORT_SYMBOL(icmp6_send); 6325f5624cfSPravin B Shelar 6331ad6d548SMenglong Dong /* Slightly more convenient version of icmp6_send with drop reasons. 6345f5624cfSPravin B Shelar */ 6351ad6d548SMenglong Dong void icmpv6_param_prob_reason(struct sk_buff *skb, u8 code, int pos, 6361ad6d548SMenglong Dong enum skb_drop_reason reason) 6375f5624cfSPravin B Shelar { 638ee576c47SJason A. Donenfeld icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL, IP6CB(skb)); 6391ad6d548SMenglong Dong kfree_skb_reason(skb, reason); 6405f5624cfSPravin B Shelar } 6417159039aSYOSHIFUJI Hideaki 6425fbba8acSEric Dumazet /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH 6435fbba8acSEric Dumazet * if sufficient data bytes are available 6445fbba8acSEric Dumazet * @nhs is the size of the tunnel header(s) : 6455fbba8acSEric Dumazet * Either an IPv4 header for SIT encap 6465fbba8acSEric Dumazet * an IPv4 header + GRE header for GRE encap 6475fbba8acSEric Dumazet */ 64820e1954fSEric Dumazet int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type, 64920e1954fSEric Dumazet unsigned int data_len) 6505fbba8acSEric Dumazet { 6512d7a3b27SEric Dumazet struct in6_addr temp_saddr; 6525fbba8acSEric Dumazet struct rt6_info *rt; 6535fbba8acSEric Dumazet struct sk_buff *skb2; 65420e1954fSEric Dumazet u32 info = 0; 6555fbba8acSEric Dumazet 6565fbba8acSEric Dumazet if (!pskb_may_pull(skb, nhs + sizeof(struct ipv6hdr) + 8)) 6575fbba8acSEric Dumazet return 1; 6585fbba8acSEric Dumazet 65920e1954fSEric Dumazet /* RFC 4884 (partial) support for ICMP extensions */ 66020e1954fSEric Dumazet if (data_len < 128 || (data_len & 7) || skb->len < data_len) 66120e1954fSEric Dumazet data_len = 0; 66220e1954fSEric Dumazet 66320e1954fSEric Dumazet skb2 = data_len ? skb_copy(skb, GFP_ATOMIC) : skb_clone(skb, GFP_ATOMIC); 6645fbba8acSEric Dumazet 6655fbba8acSEric Dumazet if (!skb2) 6665fbba8acSEric Dumazet return 1; 6675fbba8acSEric Dumazet 6685fbba8acSEric Dumazet skb_dst_drop(skb2); 6695fbba8acSEric Dumazet skb_pull(skb2, nhs); 6705fbba8acSEric Dumazet skb_reset_network_header(skb2); 6715fbba8acSEric Dumazet 672b75cc8f9SDavid Ahern rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 673b75cc8f9SDavid Ahern skb, 0); 6745fbba8acSEric Dumazet 6755fbba8acSEric Dumazet if (rt && rt->dst.dev) 6765fbba8acSEric Dumazet skb2->dev = rt->dst.dev; 6775fbba8acSEric Dumazet 6782d7a3b27SEric Dumazet ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr); 67920e1954fSEric Dumazet 68020e1954fSEric Dumazet if (data_len) { 68120e1954fSEric Dumazet /* RFC 4884 (partial) support : 68220e1954fSEric Dumazet * insert 0 padding at the end, before the extensions 68320e1954fSEric Dumazet */ 68420e1954fSEric Dumazet __skb_push(skb2, nhs); 68520e1954fSEric Dumazet skb_reset_network_header(skb2); 68620e1954fSEric Dumazet memmove(skb2->data, skb2->data + nhs, data_len - nhs); 68720e1954fSEric Dumazet memset(skb2->data + data_len - nhs, 0, nhs); 68820e1954fSEric Dumazet /* RFC 4884 4.5 : Length is measured in 64-bit words, 68920e1954fSEric Dumazet * and stored in reserved[0] 69020e1954fSEric Dumazet */ 69120e1954fSEric Dumazet info = (data_len/8) << 24; 69220e1954fSEric Dumazet } 6932d7a3b27SEric Dumazet if (type == ICMP_TIME_EXCEEDED) 6942d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 695ee576c47SJason A. Donenfeld info, &temp_saddr, IP6CB(skb2)); 6962d7a3b27SEric Dumazet else 6972d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 698ee576c47SJason A. Donenfeld info, &temp_saddr, IP6CB(skb2)); 6995fbba8acSEric Dumazet if (rt) 7005fbba8acSEric Dumazet ip6_rt_put(rt); 7015fbba8acSEric Dumazet 7025fbba8acSEric Dumazet kfree_skb(skb2); 7035fbba8acSEric Dumazet 7045fbba8acSEric Dumazet return 0; 7055fbba8acSEric Dumazet } 7065fbba8acSEric Dumazet EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach); 7075fbba8acSEric Dumazet 708*ac03694bSEric Dumazet static enum skb_drop_reason icmpv6_echo_reply(struct sk_buff *skb) 7091da177e4SLinus Torvalds { 710c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 71184427d53SYOSHIFUJI Hideaki struct sock *sk; 7121da177e4SLinus Torvalds struct inet6_dev *idev; 71384427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 714b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 715cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 7161da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 7174c9483b2SDavid S. Miller struct flowi6 fl6; 7181da177e4SLinus Torvalds struct icmpv6_msg msg; 7191da177e4SLinus Torvalds struct dst_entry *dst; 72026879da5SWei Wang struct ipcm6_cookie ipc6; 721e110861fSLorenzo Colitti u32 mark = IP6_REPLY_MARK(net, skb->mark); 722*ac03694bSEric Dumazet SKB_DR(reason); 7230b03a5caSStephen Suryaputra bool acast; 7241fd07f33SAndreas Roeseler u8 type; 7251da177e4SLinus Torvalds 72603f1ecccSStephen Suryaputra if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) && 72703f1ecccSStephen Suryaputra net->ipv6.sysctl.icmpv6_echo_ignore_multicast) 728*ac03694bSEric Dumazet return reason; 72903f1ecccSStephen Suryaputra 7300660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 7311da177e4SLinus Torvalds 7320b03a5caSStephen Suryaputra acast = ipv6_anycast_destination(skb_dst(skb), saddr); 7330b03a5caSStephen Suryaputra if (acast && net->ipv6.sysctl.icmpv6_echo_ignore_anycast) 734*ac03694bSEric Dumazet return reason; 7350b03a5caSStephen Suryaputra 736509aba3bSFX Le Bail if (!ipv6_unicast_destination(skb) && 7370b03a5caSStephen Suryaputra !(net->ipv6.sysctl.anycast_src_echo_reply && acast)) 7381da177e4SLinus Torvalds saddr = NULL; 7391da177e4SLinus Torvalds 7401fd07f33SAndreas Roeseler if (icmph->icmp6_type == ICMPV6_EXT_ECHO_REQUEST) 7411fd07f33SAndreas Roeseler type = ICMPV6_EXT_ECHO_REPLY; 7421fd07f33SAndreas Roeseler else 7431fd07f33SAndreas Roeseler type = ICMPV6_ECHO_REPLY; 7441fd07f33SAndreas Roeseler 7451da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 7461fd07f33SAndreas Roeseler tmp_hdr.icmp6_type = type; 7471da177e4SLinus Torvalds 7484c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 749a346abe0SEric Dumazet if (net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES) 750a346abe0SEric Dumazet fl6.flowlabel = ip6_flowlabel(ipv6_hdr(skb)); 751a346abe0SEric Dumazet 7524c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 7534e3fd7a0SAlexey Dobriyan fl6.daddr = ipv6_hdr(skb)->saddr; 7541da177e4SLinus Torvalds if (saddr) 7554e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 7561b70d792SDavid Ahern fl6.flowi6_oif = icmp6_iif(skb); 7571fd07f33SAndreas Roeseler fl6.fl6_icmp_type = type; 758e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 759e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 7603df98d79SPaul Moore security_skb_classify_flow(skb, flowi6_to_flowi_common(&fl6)); 7611da177e4SLinus Torvalds 7627ba91ecbSJesper Dangaard Brouer local_bh_disable(); 763fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 76463159f29SIan Morris if (!sk) 7657ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 766fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 767405666dbSDenis V. Lunev 7684c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 7694c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 770c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 771c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 7721da177e4SLinus Torvalds 7734e64b1edSJoe Perches if (ip6_dst_lookup(net, sk, &dst, &fl6)) 7741da177e4SLinus Torvalds goto out; 7754c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); 776452edd59SDavid S. Miller if (IS_ERR(dst)) 777e104411bSPatrick McHardy goto out; 7781da177e4SLinus Torvalds 7790bc19985SStephen Suryaputra /* Check the ratelimit */ 7800bc19985SStephen Suryaputra if ((!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, ICMPV6_ECHO_REPLY)) || 7810bc19985SStephen Suryaputra !icmpv6_xrlim_allow(sk, ICMPV6_ECHO_REPLY, &fl6)) 7820bc19985SStephen Suryaputra goto out_dst_release; 7830bc19985SStephen Suryaputra 784cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 7851da177e4SLinus Torvalds 7861da177e4SLinus Torvalds msg.skb = skb; 7871da177e4SLinus Torvalds msg.offset = 0; 7881fd07f33SAndreas Roeseler msg.type = type; 7891da177e4SLinus Torvalds 790b515430aSWillem de Bruijn ipcm6_init_sk(&ipc6, np); 79126879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 79226879da5SWei Wang ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 7930da7536fSWillem de Bruijn ipc6.sockc.mark = mark; 79426879da5SWei Wang 7951fd07f33SAndreas Roeseler if (icmph->icmp6_type == ICMPV6_EXT_ECHO_REQUEST) 7961fd07f33SAndreas Roeseler if (!icmp_build_probe(skb, (struct icmphdr *)&tmp_hdr)) 7971fd07f33SAndreas Roeseler goto out_dst_release; 7981fd07f33SAndreas Roeseler 7994e64b1edSJoe Perches if (ip6_append_data(sk, icmpv6_getfrag, &msg, 8004e64b1edSJoe Perches skb->len + sizeof(struct icmp6hdr), 80126879da5SWei Wang sizeof(struct icmp6hdr), &ipc6, &fl6, 8025fdaa88dSWillem de Bruijn (struct rt6_info *)dst, MSG_DONTWAIT)) { 803a16292a0SEric Dumazet __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 8041da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 805cfdf7647SEric Dumazet } else { 8064e64b1edSJoe Perches icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 807cfdf7647SEric Dumazet skb->len + sizeof(struct icmp6hdr)); 808*ac03694bSEric Dumazet reason = SKB_CONSUMED; 8091da177e4SLinus Torvalds } 8100bc19985SStephen Suryaputra out_dst_release: 8111da177e4SLinus Torvalds dst_release(dst); 8121da177e4SLinus Torvalds out: 813405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 8147ba91ecbSJesper Dangaard Brouer out_bh_enable: 8157ba91ecbSJesper Dangaard Brouer local_bh_enable(); 816*ac03694bSEric Dumazet return reason; 8171da177e4SLinus Torvalds } 8181da177e4SLinus Torvalds 81930c89badSEric Dumazet enum skb_drop_reason icmpv6_notify(struct sk_buff *skb, u8 type, 82030c89badSEric Dumazet u8 code, __be32 info) 8211da177e4SLinus Torvalds { 822e4129440SAndrew Lunn struct inet6_skb_parm *opt = IP6CB(skb); 82330c89badSEric Dumazet struct net *net = dev_net(skb->dev); 82441135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 82530c89badSEric Dumazet enum skb_drop_reason reason; 8261da177e4SLinus Torvalds int inner_offset; 82775f2811cSJesse Gross __be16 frag_off; 828f9242b6bSDavid S. Miller u8 nexthdr; 8291da177e4SLinus Torvalds 83030c89badSEric Dumazet reason = pskb_may_pull_reason(skb, sizeof(struct ipv6hdr)); 83130c89badSEric Dumazet if (reason != SKB_NOT_DROPPED_YET) 8327304fe46SDuan Jiong goto out; 8331da177e4SLinus Torvalds 834e4129440SAndrew Lunn seg6_icmp_srh(skb, opt); 835e4129440SAndrew Lunn 8361da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 8371da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 8381da177e4SLinus Torvalds /* now skip over extension headers */ 83975f2811cSJesse Gross inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 84075f2811cSJesse Gross &nexthdr, &frag_off); 84130c89badSEric Dumazet if (inner_offset < 0) { 84230c89badSEric Dumazet SKB_DR_SET(reason, IPV6_BAD_EXTHDR); 8437304fe46SDuan Jiong goto out; 84430c89badSEric Dumazet } 8451da177e4SLinus Torvalds } else { 8461da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 8471da177e4SLinus Torvalds } 8481da177e4SLinus Torvalds 8491da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 85030c89badSEric Dumazet reason = pskb_may_pull_reason(skb, inner_offset + 8); 85130c89badSEric Dumazet if (reason != SKB_NOT_DROPPED_YET) 8527304fe46SDuan Jiong goto out; 8531da177e4SLinus Torvalds 8541da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 8551da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 8561da177e4SLinus Torvalds pmtu discovery. 8571da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 8581da177e4SLinus Torvalds --ANK (980726) 8591da177e4SLinus Torvalds */ 8601da177e4SLinus Torvalds 861f9242b6bSDavid S. Miller ipprot = rcu_dereference(inet6_protos[nexthdr]); 8621da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 863e4129440SAndrew Lunn ipprot->err_handler(skb, opt, type, code, inner_offset, info); 8641da177e4SLinus Torvalds 86569d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 86630c89badSEric Dumazet return SKB_CONSUMED; 8677304fe46SDuan Jiong 8687304fe46SDuan Jiong out: 869a16292a0SEric Dumazet __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); 87030c89badSEric Dumazet return reason; 8711da177e4SLinus Torvalds } 8721da177e4SLinus Torvalds 8731da177e4SLinus Torvalds /* 8741da177e4SLinus Torvalds * Handle icmp messages 8751da177e4SLinus Torvalds */ 8761da177e4SLinus Torvalds 877e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 8781da177e4SLinus Torvalds { 879b384c95aSMenglong Dong enum skb_drop_reason reason = SKB_DROP_REASON_NOT_SPECIFIED; 880e6f86b0fSVirgile Jarry struct net *net = dev_net(skb->dev); 881e1ae5c2eSStephen Suryaputra struct net_device *dev = icmp6_dev(skb); 8821da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 883b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 8841da177e4SLinus Torvalds struct icmp6hdr *hdr; 885d5fdd6baSBrian Haley u8 type; 8861da177e4SLinus Torvalds 887aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 888def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 8898b7817f3SHerbert Xu int nh; 8908b7817f3SHerbert Xu 891def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 892b384c95aSMenglong Dong XFRM_STATE_ICMP)) { 893b384c95aSMenglong Dong reason = SKB_DROP_REASON_XFRM_POLICY; 894aebcf82cSHerbert Xu goto drop_no_count; 895b384c95aSMenglong Dong } 896aebcf82cSHerbert Xu 89781aded24SDavid S. Miller if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) 8988b7817f3SHerbert Xu goto drop_no_count; 8998b7817f3SHerbert Xu 9008b7817f3SHerbert Xu nh = skb_network_offset(skb); 9018b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 9028b7817f3SHerbert Xu 903b384c95aSMenglong Dong if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, 904b384c95aSMenglong Dong skb)) { 905b384c95aSMenglong Dong reason = SKB_DROP_REASON_XFRM_POLICY; 9068b7817f3SHerbert Xu goto drop_no_count; 907b384c95aSMenglong Dong } 9088b7817f3SHerbert Xu 9098b7817f3SHerbert Xu skb_set_network_header(skb, nh); 9108b7817f3SHerbert Xu } 9118b7817f3SHerbert Xu 912a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS); 9131da177e4SLinus Torvalds 9140660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 9150660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 9161da177e4SLinus Torvalds 91739471ac8STom Herbert if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { 918ba7a46f1SJoe Perches net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", 9190c6ce78aSHarvey Harrison saddr, daddr); 9206a5dc9e5SEric Dumazet goto csum_error; 9211da177e4SLinus Torvalds } 9221da177e4SLinus Torvalds 9238cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 9248cf22943SHerbert Xu goto discard_it; 9251da177e4SLinus Torvalds 926cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 9271da177e4SLinus Torvalds 9281da177e4SLinus Torvalds type = hdr->icmp6_type; 9291da177e4SLinus Torvalds 930f3832ed2SEric Dumazet ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type); 9311da177e4SLinus Torvalds 9321da177e4SLinus Torvalds switch (type) { 9331da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 934e6f86b0fSVirgile Jarry if (!net->ipv6.sysctl.icmpv6_echo_ignore_all) 935*ac03694bSEric Dumazet reason = icmpv6_echo_reply(skb); 9361da177e4SLinus Torvalds break; 9371fd07f33SAndreas Roeseler case ICMPV6_EXT_ECHO_REQUEST: 9381fd07f33SAndreas Roeseler if (!net->ipv6.sysctl.icmpv6_echo_ignore_all && 9394a2f7083SKuniyuki Iwashima READ_ONCE(net->ipv4.sysctl_icmp_echo_enable_probe)) 940*ac03694bSEric Dumazet reason = icmpv6_echo_reply(skb); 9411fd07f33SAndreas Roeseler break; 9421da177e4SLinus Torvalds 9431da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 944b384c95aSMenglong Dong reason = ping_rcv(skb); 9451da177e4SLinus Torvalds break; 9461da177e4SLinus Torvalds 94731433202SAndreas Roeseler case ICMPV6_EXT_ECHO_REPLY: 948b384c95aSMenglong Dong reason = ping_rcv(skb); 94931433202SAndreas Roeseler break; 95031433202SAndreas Roeseler 9511da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 9521da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 9531da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 9541da177e4SLinus Torvalds destination cache will allow to solve this problem 9551da177e4SLinus Torvalds --ANK (980726) 9561da177e4SLinus Torvalds */ 9571da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 9581da177e4SLinus Torvalds goto discard_it; 959cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 9601da177e4SLinus Torvalds 961275757e6SGustavo A. R. Silva /* to notify */ 962a8eceea8SJoe Perches fallthrough; 9631da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 9641da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 9651da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 96630c89badSEric Dumazet reason = icmpv6_notify(skb, type, hdr->icmp6_code, 96730c89badSEric Dumazet hdr->icmp6_mtu); 9681da177e4SLinus Torvalds break; 9691da177e4SLinus Torvalds 9701da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 9711da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 9721da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 9731da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 9741da177e4SLinus Torvalds case NDISC_REDIRECT: 975545dbcd1SEric Dumazet reason = ndisc_rcv(skb); 9761da177e4SLinus Torvalds break; 9771da177e4SLinus Torvalds 9781da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 9791da177e4SLinus Torvalds igmp6_event_query(skb); 980f185de28STaehee Yoo return 0; 9811da177e4SLinus Torvalds 9821da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 9831da177e4SLinus Torvalds igmp6_event_report(skb); 984f185de28STaehee Yoo return 0; 9851da177e4SLinus Torvalds 9861da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 9871da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 9881da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 9891da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 9901da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 9911da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 9921da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 9931da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 9941da177e4SLinus Torvalds break; 9951da177e4SLinus Torvalds 9961da177e4SLinus Torvalds default: 9971da177e4SLinus Torvalds /* informational */ 9981da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 9991da177e4SLinus Torvalds break; 10001da177e4SLinus Torvalds 10014b3418fbSBjørn Mork net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n", 10024b3418fbSBjørn Mork saddr, daddr); 1003ea85a0a2SDavid S. Miller 10041da177e4SLinus Torvalds /* 10051da177e4SLinus Torvalds * error of unknown type. 10061da177e4SLinus Torvalds * must pass to upper level 10071da177e4SLinus Torvalds */ 10081da177e4SLinus Torvalds 100930c89badSEric Dumazet reason = icmpv6_notify(skb, type, hdr->icmp6_code, 101030c89badSEric Dumazet hdr->icmp6_mtu); 10113ff50b79SStephen Hemminger } 10123ff50b79SStephen Hemminger 1013e3e32170SRick Jones /* until the v6 path can be better sorted assume failure and 1014e3e32170SRick Jones * preserve the status quo behaviour for the rest of the paths to here 1015e3e32170SRick Jones */ 1016b384c95aSMenglong Dong if (reason) 1017b384c95aSMenglong Dong kfree_skb_reason(skb, reason); 1018e3e32170SRick Jones else 1019b384c95aSMenglong Dong consume_skb(skb); 1020e3e32170SRick Jones 10211da177e4SLinus Torvalds return 0; 10221da177e4SLinus Torvalds 10236a5dc9e5SEric Dumazet csum_error: 1024b384c95aSMenglong Dong reason = SKB_DROP_REASON_ICMP_CSUM; 1025a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); 10261da177e4SLinus Torvalds discard_it: 1027a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS); 10288b7817f3SHerbert Xu drop_no_count: 1029b384c95aSMenglong Dong kfree_skb_reason(skb, reason); 10301da177e4SLinus Torvalds return 0; 10311da177e4SLinus Torvalds } 10321da177e4SLinus Torvalds 10334c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, 103495e41e93SYOSHIFUJI Hideaki u8 type, 103595e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 103695e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 103795e41e93SYOSHIFUJI Hideaki int oif) 103895e41e93SYOSHIFUJI Hideaki { 10394c9483b2SDavid S. Miller memset(fl6, 0, sizeof(*fl6)); 10404e3fd7a0SAlexey Dobriyan fl6->saddr = *saddr; 10414e3fd7a0SAlexey Dobriyan fl6->daddr = *daddr; 10424c9483b2SDavid S. Miller fl6->flowi6_proto = IPPROTO_ICMPV6; 10431958b856SDavid S. Miller fl6->fl6_icmp_type = type; 10441958b856SDavid S. Miller fl6->fl6_icmp_code = 0; 10454c9483b2SDavid S. Miller fl6->flowi6_oif = oif; 10463df98d79SPaul Moore security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6)); 104795e41e93SYOSHIFUJI Hideaki } 104895e41e93SYOSHIFUJI Hideaki 10496a17b961SEric Dumazet int __init icmpv6_init(void) 10501da177e4SLinus Torvalds { 10511da177e4SLinus Torvalds struct sock *sk; 10523232a1efSKefeng Wang int err, i; 10531da177e4SLinus Torvalds 10546f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 10551ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 10566a17b961SEric Dumazet SOCK_RAW, IPPROTO_ICMPV6, &init_net); 10571da177e4SLinus Torvalds if (err < 0) { 1058f3213831SJoe Perches pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", 10591da177e4SLinus Torvalds err); 10606a17b961SEric Dumazet return err; 10611da177e4SLinus Torvalds } 10621da177e4SLinus Torvalds 10636a17b961SEric Dumazet per_cpu(ipv6_icmp_sk, i) = sk; 10645c8cafd6SDenis V. Lunev 10651da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 10661da177e4SLinus Torvalds * sk_buff struct overhead. 10671da177e4SLinus Torvalds */ 106887fb4b7bSEric Dumazet sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); 10691da177e4SLinus Torvalds } 107098c6d1b2SDenis V. Lunev 107198c6d1b2SDenis V. Lunev err = -EAGAIN; 107298c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 107398c6d1b2SDenis V. Lunev goto fail; 10745f5624cfSPravin B Shelar 10755f5624cfSPravin B Shelar err = inet6_register_icmp_sender(icmp6_send); 10765f5624cfSPravin B Shelar if (err) 10775f5624cfSPravin B Shelar goto sender_reg_err; 107898c6d1b2SDenis V. Lunev return 0; 107998c6d1b2SDenis V. Lunev 10805f5624cfSPravin B Shelar sender_reg_err: 10815f5624cfSPravin B Shelar inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 108298c6d1b2SDenis V. Lunev fail: 1083f3213831SJoe Perches pr_err("Failed to register ICMP6 protocol\n"); 108498c6d1b2SDenis V. Lunev return err; 108598c6d1b2SDenis V. Lunev } 108698c6d1b2SDenis V. Lunev 10878ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 108898c6d1b2SDenis V. Lunev { 10895f5624cfSPravin B Shelar inet6_unregister_icmp_sender(icmp6_send); 10901da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 10911da177e4SLinus Torvalds } 10921da177e4SLinus Torvalds 109398c6d1b2SDenis V. Lunev 10949b5b5cffSArjan van de Ven static const struct icmp6_err { 10951da177e4SLinus Torvalds int err; 10961da177e4SLinus Torvalds int fatal; 10971da177e4SLinus Torvalds } tab_unreach[] = { 10981da177e4SLinus Torvalds { /* NOROUTE */ 10991da177e4SLinus Torvalds .err = ENETUNREACH, 11001da177e4SLinus Torvalds .fatal = 0, 11011da177e4SLinus Torvalds }, 11021da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 11031da177e4SLinus Torvalds .err = EACCES, 11041da177e4SLinus Torvalds .fatal = 1, 11051da177e4SLinus Torvalds }, 11061da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 11071da177e4SLinus Torvalds .err = EHOSTUNREACH, 11081da177e4SLinus Torvalds .fatal = 0, 11091da177e4SLinus Torvalds }, 11101da177e4SLinus Torvalds { /* ADDR_UNREACH */ 11111da177e4SLinus Torvalds .err = EHOSTUNREACH, 11121da177e4SLinus Torvalds .fatal = 0, 11131da177e4SLinus Torvalds }, 11141da177e4SLinus Torvalds { /* PORT_UNREACH */ 11151da177e4SLinus Torvalds .err = ECONNREFUSED, 11161da177e4SLinus Torvalds .fatal = 1, 11171da177e4SLinus Torvalds }, 111861e76b17SJiri Bohac { /* POLICY_FAIL */ 111961e76b17SJiri Bohac .err = EACCES, 112061e76b17SJiri Bohac .fatal = 1, 112161e76b17SJiri Bohac }, 112261e76b17SJiri Bohac { /* REJECT_ROUTE */ 112361e76b17SJiri Bohac .err = EACCES, 112461e76b17SJiri Bohac .fatal = 1, 112561e76b17SJiri Bohac }, 11261da177e4SLinus Torvalds }; 11271da177e4SLinus Torvalds 1128d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 11291da177e4SLinus Torvalds { 11301da177e4SLinus Torvalds int fatal = 0; 11311da177e4SLinus Torvalds 11321da177e4SLinus Torvalds *err = EPROTO; 11331da177e4SLinus Torvalds 11341da177e4SLinus Torvalds switch (type) { 11351da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 11361da177e4SLinus Torvalds fatal = 1; 113761e76b17SJiri Bohac if (code < ARRAY_SIZE(tab_unreach)) { 11381da177e4SLinus Torvalds *err = tab_unreach[code].err; 11391da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 11401da177e4SLinus Torvalds } 11411da177e4SLinus Torvalds break; 11421da177e4SLinus Torvalds 11431da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 11441da177e4SLinus Torvalds *err = EMSGSIZE; 11451da177e4SLinus Torvalds break; 11461da177e4SLinus Torvalds 11471da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 11481da177e4SLinus Torvalds *err = EPROTO; 11491da177e4SLinus Torvalds fatal = 1; 11501da177e4SLinus Torvalds break; 11511da177e4SLinus Torvalds 11521da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 11531da177e4SLinus Torvalds *err = EHOSTUNREACH; 11541da177e4SLinus Torvalds break; 11553ff50b79SStephen Hemminger } 11561da177e4SLinus Torvalds 11571da177e4SLinus Torvalds return fatal; 11581da177e4SLinus Torvalds } 11597159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 11607159039aSYOSHIFUJI Hideaki 11611da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 1162e8243534Sstephen hemminger static struct ctl_table ipv6_icmp_table_template[] = { 11631da177e4SLinus Torvalds { 11641da177e4SLinus Torvalds .procname = "ratelimit", 116541a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 11661da177e4SLinus Torvalds .maxlen = sizeof(int), 11671da177e4SLinus Torvalds .mode = 0644, 11686d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 11691da177e4SLinus Torvalds }, 1170e6f86b0fSVirgile Jarry { 1171e6f86b0fSVirgile Jarry .procname = "echo_ignore_all", 1172e6f86b0fSVirgile Jarry .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_all, 1173a6175633SEric Dumazet .maxlen = sizeof(u8), 1174e6f86b0fSVirgile Jarry .mode = 0644, 1175a6175633SEric Dumazet .proc_handler = proc_dou8vec_minmax, 1176e6f86b0fSVirgile Jarry }, 117703f1ecccSStephen Suryaputra { 117803f1ecccSStephen Suryaputra .procname = "echo_ignore_multicast", 117903f1ecccSStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_multicast, 1180a6175633SEric Dumazet .maxlen = sizeof(u8), 118103f1ecccSStephen Suryaputra .mode = 0644, 1182a6175633SEric Dumazet .proc_handler = proc_dou8vec_minmax, 118303f1ecccSStephen Suryaputra }, 11840b03a5caSStephen Suryaputra { 11850b03a5caSStephen Suryaputra .procname = "echo_ignore_anycast", 11860b03a5caSStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_anycast, 1187a6175633SEric Dumazet .maxlen = sizeof(u8), 11880b03a5caSStephen Suryaputra .mode = 0644, 1189a6175633SEric Dumazet .proc_handler = proc_dou8vec_minmax, 11900b03a5caSStephen Suryaputra }, 11910bc19985SStephen Suryaputra { 11920bc19985SStephen Suryaputra .procname = "ratemask", 11930bc19985SStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_ratemask_ptr, 11940bc19985SStephen Suryaputra .maxlen = ICMPV6_MSG_MAX + 1, 11950bc19985SStephen Suryaputra .mode = 0644, 11960bc19985SStephen Suryaputra .proc_handler = proc_do_large_bitmap, 11970bc19985SStephen Suryaputra }, 1198f8572d8fSEric W. Biederman { }, 11991da177e4SLinus Torvalds }; 1200760f2d01SDaniel Lezcano 12012c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 1202760f2d01SDaniel Lezcano { 1203760f2d01SDaniel Lezcano struct ctl_table *table; 1204760f2d01SDaniel Lezcano 1205760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 1206760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 1207760f2d01SDaniel Lezcano GFP_KERNEL); 12085ee09105SYOSHIFUJI Hideaki 1209e6f86b0fSVirgile Jarry if (table) { 12105ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 1211e6f86b0fSVirgile Jarry table[1].data = &net->ipv6.sysctl.icmpv6_echo_ignore_all; 121203f1ecccSStephen Suryaputra table[2].data = &net->ipv6.sysctl.icmpv6_echo_ignore_multicast; 12130b03a5caSStephen Suryaputra table[3].data = &net->ipv6.sysctl.icmpv6_echo_ignore_anycast; 12140bc19985SStephen Suryaputra table[4].data = &net->ipv6.sysctl.icmpv6_ratemask_ptr; 1215e6f86b0fSVirgile Jarry } 1216760f2d01SDaniel Lezcano return table; 1217760f2d01SDaniel Lezcano } 12181da177e4SLinus Torvalds #endif 1219