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 186*d0941130SJamie 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 } 228*d0941130SJamie Bainbridge if (!res) 229*d0941130SJamie Bainbridge __ICMP6_INC_STATS(net, ip6_dst_idev(dst), 230*d0941130SJamie 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 struct in6_addr tmp; 33679383236SMasahide NAKAMURA int off; 33779383236SMasahide NAKAMURA 33879383236SMasahide NAKAMURA if (opt->dsthao) { 33979383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 34079383236SMasahide NAKAMURA if (likely(off >= 0)) { 341d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 342d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 3434e3fd7a0SAlexey Dobriyan tmp = iph->saddr; 3444e3fd7a0SAlexey Dobriyan iph->saddr = hao->addr; 3454e3fd7a0SAlexey Dobriyan hao->addr = tmp; 34679383236SMasahide NAKAMURA } 34779383236SMasahide NAKAMURA } 34879383236SMasahide NAKAMURA } 34979383236SMasahide NAKAMURA #else 350ee576c47SJason A. Donenfeld static inline void mip6_addr_swap(struct sk_buff *skb, const struct inet6_skb_parm *opt) {} 35179383236SMasahide NAKAMURA #endif 35279383236SMasahide NAKAMURA 353e8243534Sstephen hemminger static struct dst_entry *icmpv6_route_lookup(struct net *net, 354e8243534Sstephen hemminger struct sk_buff *skb, 355e8243534Sstephen hemminger struct sock *sk, 356e8243534Sstephen hemminger struct flowi6 *fl6) 357b42835dbSDavid S. Miller { 358b42835dbSDavid S. Miller struct dst_entry *dst, *dst2; 3594c9483b2SDavid S. Miller struct flowi6 fl2; 360b42835dbSDavid S. Miller int err; 361b42835dbSDavid S. Miller 362343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst, fl6); 363b42835dbSDavid S. Miller if (err) 364b42835dbSDavid S. Miller return ERR_PTR(err); 365b42835dbSDavid S. Miller 366b42835dbSDavid S. Miller /* 367b42835dbSDavid S. Miller * We won't send icmp if the destination is known 368b42835dbSDavid S. Miller * anycast. 369b42835dbSDavid S. Miller */ 3702647a9b0SMartin KaFai Lau if (ipv6_anycast_destination(dst, &fl6->daddr)) { 371ba7a46f1SJoe Perches net_dbg_ratelimited("icmp6_send: acast source\n"); 372b42835dbSDavid S. Miller dst_release(dst); 373b42835dbSDavid S. Miller return ERR_PTR(-EINVAL); 374b42835dbSDavid S. Miller } 375b42835dbSDavid S. Miller 376b42835dbSDavid S. Miller /* No need to clone since we're just using its address. */ 377b42835dbSDavid S. Miller dst2 = dst; 378b42835dbSDavid S. Miller 3794c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); 380452edd59SDavid S. Miller if (!IS_ERR(dst)) { 381b42835dbSDavid S. Miller if (dst != dst2) 382b42835dbSDavid S. Miller return dst; 383452edd59SDavid S. Miller } else { 384452edd59SDavid S. Miller if (PTR_ERR(dst) == -EPERM) 385b42835dbSDavid S. Miller dst = NULL; 386452edd59SDavid S. Miller else 387452edd59SDavid S. Miller return dst; 388b42835dbSDavid S. Miller } 389b42835dbSDavid S. Miller 3904c9483b2SDavid S. Miller err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); 391b42835dbSDavid S. Miller if (err) 392b42835dbSDavid S. Miller goto relookup_failed; 393b42835dbSDavid S. Miller 394343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst2, &fl2); 395b42835dbSDavid S. Miller if (err) 396b42835dbSDavid S. Miller goto relookup_failed; 397b42835dbSDavid S. Miller 3984c9483b2SDavid S. Miller dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); 399452edd59SDavid S. Miller if (!IS_ERR(dst2)) { 400b42835dbSDavid S. Miller dst_release(dst); 401b42835dbSDavid S. Miller dst = dst2; 402452edd59SDavid S. Miller } else { 403452edd59SDavid S. Miller err = PTR_ERR(dst2); 404452edd59SDavid S. Miller if (err == -EPERM) { 405b42835dbSDavid S. Miller dst_release(dst); 406452edd59SDavid S. Miller return dst2; 407452edd59SDavid S. Miller } else 408b42835dbSDavid S. Miller goto relookup_failed; 409b42835dbSDavid S. Miller } 410b42835dbSDavid S. Miller 411b42835dbSDavid S. Miller relookup_failed: 412b42835dbSDavid S. Miller if (dst) 413b42835dbSDavid S. Miller return dst; 414b42835dbSDavid S. Miller return ERR_PTR(err); 415b42835dbSDavid S. Miller } 416b42835dbSDavid S. Miller 417e1ae5c2eSStephen Suryaputra static struct net_device *icmp6_dev(const struct sk_buff *skb) 4181b70d792SDavid Ahern { 419e1ae5c2eSStephen Suryaputra struct net_device *dev = skb->dev; 4201b70d792SDavid Ahern 4211b70d792SDavid Ahern /* for local traffic to local address, skb dev is the loopback 4221b70d792SDavid Ahern * device. Check if there is a dst attached to the skb and if so 42324b711edSDavid Ahern * get the real device index. Same is needed for replies to a link 42424b711edSDavid Ahern * local address on a device enslaved to an L3 master device 4251b70d792SDavid Ahern */ 426e1ae5c2eSStephen Suryaputra if (unlikely(dev->ifindex == LOOPBACK_IFINDEX || netif_is_l3_master(skb->dev))) { 4271b70d792SDavid Ahern const struct rt6_info *rt6 = skb_rt6_info(skb); 4281b70d792SDavid Ahern 4291b70d792SDavid Ahern if (rt6) 430e1ae5c2eSStephen Suryaputra dev = rt6->rt6i_idev->dev; 4311b70d792SDavid Ahern } 4321b70d792SDavid Ahern 433e1ae5c2eSStephen Suryaputra return dev; 434e1ae5c2eSStephen Suryaputra } 435e1ae5c2eSStephen Suryaputra 436e1ae5c2eSStephen Suryaputra static int icmp6_iif(const struct sk_buff *skb) 437e1ae5c2eSStephen Suryaputra { 438e1ae5c2eSStephen Suryaputra return icmp6_dev(skb)->ifindex; 4391b70d792SDavid Ahern } 4401b70d792SDavid Ahern 4411da177e4SLinus Torvalds /* 4421da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 4431da177e4SLinus Torvalds */ 444cc7a21b6SEric Dumazet void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info, 445ee576c47SJason A. Donenfeld const struct in6_addr *force_saddr, 446ee576c47SJason A. Donenfeld const struct inet6_skb_parm *parm) 4471da177e4SLinus Torvalds { 4481da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 4490660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 45084427d53SYOSHIFUJI Hideaki struct sock *sk; 4518d933670SEric Dumazet struct net *net; 45284427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 453b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 4541da177e4SLinus Torvalds struct dst_entry *dst; 4551da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 4564c9483b2SDavid S. Miller struct flowi6 fl6; 4571da177e4SLinus Torvalds struct icmpv6_msg msg; 45826879da5SWei Wang struct ipcm6_cookie ipc6; 4591da177e4SLinus Torvalds int iif = 0; 4601da177e4SLinus Torvalds int addr_type = 0; 4611da177e4SLinus Torvalds int len; 4628d933670SEric Dumazet u32 mark; 4631da177e4SLinus Torvalds 46427a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 46529a3cad5SSimon Horman (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb)) 4661da177e4SLinus Torvalds return; 4671da177e4SLinus Torvalds 4688d933670SEric Dumazet if (!skb->dev) 4698d933670SEric Dumazet return; 4708d933670SEric Dumazet net = dev_net(skb->dev); 4718d933670SEric Dumazet mark = IP6_REPLY_MARK(net, skb->mark); 4721da177e4SLinus Torvalds /* 4731da177e4SLinus Torvalds * Make sure we respect the rules 4741da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 4755f5624cfSPravin B Shelar * Rule (e.1) is enforced by not using icmp6_send 4761da177e4SLinus Torvalds * in any code that processes icmp errors. 4771da177e4SLinus Torvalds */ 4781da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 4791da177e4SLinus Torvalds 480446fab59SFX Le Bail if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) || 481d94c1f92SFX Le Bail ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr)) 4821da177e4SLinus Torvalds saddr = &hdr->daddr; 4831da177e4SLinus Torvalds 4841da177e4SLinus Torvalds /* 4851da177e4SLinus Torvalds * Dest addr check 4861da177e4SLinus Torvalds */ 4871da177e4SLinus Torvalds 4889a6b4b39Szhuyj if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) { 4891da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 4901da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 4911da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 4921da177e4SLinus Torvalds (opt_unrec(skb, info)))) 4931da177e4SLinus Torvalds return; 4941da177e4SLinus Torvalds 4951da177e4SLinus Torvalds saddr = NULL; 4961da177e4SLinus Torvalds } 4971da177e4SLinus Torvalds 4981da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 4991da177e4SLinus Torvalds 5001da177e4SLinus Torvalds /* 5011da177e4SLinus Torvalds * Source addr check 5021da177e4SLinus Torvalds */ 5031da177e4SLinus Torvalds 5044832c30dSDavid Ahern if (__ipv6_addr_needs_scope_id(addr_type)) { 5051b70d792SDavid Ahern iif = icmp6_iif(skb); 5064832c30dSDavid Ahern } else { 507272928d1SMathieu Desnoyers /* 508272928d1SMathieu Desnoyers * The source device is used for looking up which routing table 509272928d1SMathieu Desnoyers * to use for sending an ICMP error. 510272928d1SMathieu Desnoyers */ 511272928d1SMathieu Desnoyers iif = l3mdev_master_ifindex(skb->dev); 51279dc7e3fSDavid Ahern } 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds /* 5158de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 5168de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 5178de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 5188de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 5191da177e4SLinus Torvalds */ 5201da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 5214b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n", 5224b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5231da177e4SLinus Torvalds return; 5241da177e4SLinus Torvalds } 5251da177e4SLinus Torvalds 5261da177e4SLinus Torvalds /* 5271da177e4SLinus Torvalds * Never answer to a ICMP packet. 5281da177e4SLinus Torvalds */ 5291da177e4SLinus Torvalds if (is_ineligible(skb)) { 5304b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n", 5314b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5321da177e4SLinus Torvalds return; 5331da177e4SLinus Torvalds } 5341da177e4SLinus Torvalds 5357ba91ecbSJesper Dangaard Brouer /* Needed by both icmp_global_allow and icmpv6_xmit_lock */ 5367ba91ecbSJesper Dangaard Brouer local_bh_disable(); 5377ba91ecbSJesper Dangaard Brouer 5387ba91ecbSJesper Dangaard Brouer /* Check global sysctl_icmp_msgs_per_sec ratelimit */ 5390bc19985SStephen Suryaputra if (!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, type)) 5407ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 5417ba91ecbSJesper Dangaard Brouer 542ee576c47SJason A. Donenfeld mip6_addr_swap(skb, parm); 54379383236SMasahide NAKAMURA 544fac6fce9SFrancesco Ruggeri sk = icmpv6_xmit_lock(net); 545fac6fce9SFrancesco Ruggeri if (!sk) 546fac6fce9SFrancesco Ruggeri goto out_bh_enable; 547fac6fce9SFrancesco Ruggeri 5484c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 5494c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 5504e3fd7a0SAlexey Dobriyan fl6.daddr = hdr->saddr; 551b1cadc1aSEric Dumazet if (force_saddr) 552b1cadc1aSEric Dumazet saddr = force_saddr; 553fac6fce9SFrancesco Ruggeri if (saddr) { 5544e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 555b93cfb9cSTim Stallard } else if (!icmpv6_rt_has_prefsrc(sk, type, &fl6)) { 556fac6fce9SFrancesco Ruggeri /* select a more meaningful saddr from input if */ 557fac6fce9SFrancesco Ruggeri struct net_device *in_netdev; 558fac6fce9SFrancesco Ruggeri 559ee576c47SJason A. Donenfeld in_netdev = dev_get_by_index(net, parm->iif); 560fac6fce9SFrancesco Ruggeri if (in_netdev) { 561fac6fce9SFrancesco Ruggeri ipv6_dev_get_saddr(net, in_netdev, &fl6.daddr, 562fac6fce9SFrancesco Ruggeri inet6_sk(sk)->srcprefs, 563fac6fce9SFrancesco Ruggeri &fl6.saddr); 564fac6fce9SFrancesco Ruggeri dev_put(in_netdev); 565fac6fce9SFrancesco Ruggeri } 566fac6fce9SFrancesco Ruggeri } 567e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 5684c9483b2SDavid S. Miller fl6.flowi6_oif = iif; 5691958b856SDavid S. Miller fl6.fl6_icmp_type = type; 5701958b856SDavid S. Miller fl6.fl6_icmp_code = code; 571e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 572b4bac172SDavid Ahern fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, NULL); 5733df98d79SPaul Moore security_skb_classify_flow(skb, flowi6_to_flowi_common(&fl6)); 5741da177e4SLinus Torvalds 575fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 576405666dbSDenis V. Lunev 5774c9483b2SDavid S. Miller if (!icmpv6_xrlim_allow(sk, type, &fl6)) 5781da177e4SLinus Torvalds goto out; 5791da177e4SLinus Torvalds 5801da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 5811da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 5821da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 5831da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 5841da177e4SLinus Torvalds 5854c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 5864c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 587c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 588c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 5891da177e4SLinus Torvalds 590b515430aSWillem de Bruijn ipcm6_init_sk(&ipc6, np); 5910da7536fSWillem de Bruijn ipc6.sockc.mark = mark; 59238b7097bSHannes Frederic Sowa fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 59338b7097bSHannes Frederic Sowa 5944c9483b2SDavid S. Miller dst = icmpv6_route_lookup(net, skb, sk, &fl6); 595b42835dbSDavid S. Miller if (IS_ERR(dst)) 5961da177e4SLinus Torvalds goto out; 5978de3351eSYOSHIFUJI Hideaki 59826879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 5991da177e4SLinus Torvalds 6001da177e4SLinus Torvalds msg.skb = skb; 601bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 602763ecff1SYasuyuki Kozakai msg.type = type; 6031da177e4SLinus Torvalds 6041da177e4SLinus Torvalds len = skb->len - msg.offset; 6051da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); 6061da177e4SLinus Torvalds if (len < 0) { 6074b3418fbSBjørn Mork net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n", 6084b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 6091da177e4SLinus Torvalds goto out_dst_release; 6101da177e4SLinus Torvalds } 6111da177e4SLinus Torvalds 612cfdf7647SEric Dumazet rcu_read_lock(); 613cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 6141da177e4SLinus Torvalds 6154e64b1edSJoe Perches if (ip6_append_data(sk, icmpv6_getfrag, &msg, 6161da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 61726879da5SWei Wang sizeof(struct icmp6hdr), 61826879da5SWei Wang &ipc6, &fl6, (struct rt6_info *)dst, 6195fdaa88dSWillem de Bruijn MSG_DONTWAIT)) { 62043a43b60SHannes Frederic Sowa ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 6211da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 622cfdf7647SEric Dumazet } else { 6234e64b1edSJoe Perches icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 624cfdf7647SEric Dumazet len + sizeof(struct icmp6hdr)); 6251da177e4SLinus Torvalds } 626cfdf7647SEric Dumazet rcu_read_unlock(); 6271da177e4SLinus Torvalds out_dst_release: 6281da177e4SLinus Torvalds dst_release(dst); 6291da177e4SLinus Torvalds out: 630405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 6317ba91ecbSJesper Dangaard Brouer out_bh_enable: 6327ba91ecbSJesper Dangaard Brouer local_bh_enable(); 6331da177e4SLinus Torvalds } 634cc7a21b6SEric Dumazet EXPORT_SYMBOL(icmp6_send); 6355f5624cfSPravin B Shelar 6361ad6d548SMenglong Dong /* Slightly more convenient version of icmp6_send with drop reasons. 6375f5624cfSPravin B Shelar */ 6381ad6d548SMenglong Dong void icmpv6_param_prob_reason(struct sk_buff *skb, u8 code, int pos, 6391ad6d548SMenglong Dong enum skb_drop_reason reason) 6405f5624cfSPravin B Shelar { 641ee576c47SJason A. Donenfeld icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL, IP6CB(skb)); 6421ad6d548SMenglong Dong kfree_skb_reason(skb, reason); 6435f5624cfSPravin B Shelar } 6447159039aSYOSHIFUJI Hideaki 6455fbba8acSEric Dumazet /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH 6465fbba8acSEric Dumazet * if sufficient data bytes are available 6475fbba8acSEric Dumazet * @nhs is the size of the tunnel header(s) : 6485fbba8acSEric Dumazet * Either an IPv4 header for SIT encap 6495fbba8acSEric Dumazet * an IPv4 header + GRE header for GRE encap 6505fbba8acSEric Dumazet */ 65120e1954fSEric Dumazet int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type, 65220e1954fSEric Dumazet unsigned int data_len) 6535fbba8acSEric Dumazet { 6542d7a3b27SEric Dumazet struct in6_addr temp_saddr; 6555fbba8acSEric Dumazet struct rt6_info *rt; 6565fbba8acSEric Dumazet struct sk_buff *skb2; 65720e1954fSEric Dumazet u32 info = 0; 6585fbba8acSEric Dumazet 6595fbba8acSEric Dumazet if (!pskb_may_pull(skb, nhs + sizeof(struct ipv6hdr) + 8)) 6605fbba8acSEric Dumazet return 1; 6615fbba8acSEric Dumazet 66220e1954fSEric Dumazet /* RFC 4884 (partial) support for ICMP extensions */ 66320e1954fSEric Dumazet if (data_len < 128 || (data_len & 7) || skb->len < data_len) 66420e1954fSEric Dumazet data_len = 0; 66520e1954fSEric Dumazet 66620e1954fSEric Dumazet skb2 = data_len ? skb_copy(skb, GFP_ATOMIC) : skb_clone(skb, GFP_ATOMIC); 6675fbba8acSEric Dumazet 6685fbba8acSEric Dumazet if (!skb2) 6695fbba8acSEric Dumazet return 1; 6705fbba8acSEric Dumazet 6715fbba8acSEric Dumazet skb_dst_drop(skb2); 6725fbba8acSEric Dumazet skb_pull(skb2, nhs); 6735fbba8acSEric Dumazet skb_reset_network_header(skb2); 6745fbba8acSEric Dumazet 675b75cc8f9SDavid Ahern rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 676b75cc8f9SDavid Ahern skb, 0); 6775fbba8acSEric Dumazet 6785fbba8acSEric Dumazet if (rt && rt->dst.dev) 6795fbba8acSEric Dumazet skb2->dev = rt->dst.dev; 6805fbba8acSEric Dumazet 6812d7a3b27SEric Dumazet ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr); 68220e1954fSEric Dumazet 68320e1954fSEric Dumazet if (data_len) { 68420e1954fSEric Dumazet /* RFC 4884 (partial) support : 68520e1954fSEric Dumazet * insert 0 padding at the end, before the extensions 68620e1954fSEric Dumazet */ 68720e1954fSEric Dumazet __skb_push(skb2, nhs); 68820e1954fSEric Dumazet skb_reset_network_header(skb2); 68920e1954fSEric Dumazet memmove(skb2->data, skb2->data + nhs, data_len - nhs); 69020e1954fSEric Dumazet memset(skb2->data + data_len - nhs, 0, nhs); 69120e1954fSEric Dumazet /* RFC 4884 4.5 : Length is measured in 64-bit words, 69220e1954fSEric Dumazet * and stored in reserved[0] 69320e1954fSEric Dumazet */ 69420e1954fSEric Dumazet info = (data_len/8) << 24; 69520e1954fSEric Dumazet } 6962d7a3b27SEric Dumazet if (type == ICMP_TIME_EXCEEDED) 6972d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 698ee576c47SJason A. Donenfeld info, &temp_saddr, IP6CB(skb2)); 6992d7a3b27SEric Dumazet else 7002d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 701ee576c47SJason A. Donenfeld info, &temp_saddr, IP6CB(skb2)); 7025fbba8acSEric Dumazet if (rt) 7035fbba8acSEric Dumazet ip6_rt_put(rt); 7045fbba8acSEric Dumazet 7055fbba8acSEric Dumazet kfree_skb(skb2); 7065fbba8acSEric Dumazet 7075fbba8acSEric Dumazet return 0; 7085fbba8acSEric Dumazet } 7095fbba8acSEric Dumazet EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach); 7105fbba8acSEric Dumazet 7111da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 7121da177e4SLinus Torvalds { 713c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 71484427d53SYOSHIFUJI Hideaki struct sock *sk; 7151da177e4SLinus Torvalds struct inet6_dev *idev; 71684427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 717b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 718cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 7191da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 7204c9483b2SDavid S. Miller struct flowi6 fl6; 7211da177e4SLinus Torvalds struct icmpv6_msg msg; 7221da177e4SLinus Torvalds struct dst_entry *dst; 72326879da5SWei Wang struct ipcm6_cookie ipc6; 724e110861fSLorenzo Colitti u32 mark = IP6_REPLY_MARK(net, skb->mark); 7250b03a5caSStephen Suryaputra bool acast; 7261fd07f33SAndreas Roeseler u8 type; 7271da177e4SLinus Torvalds 72803f1ecccSStephen Suryaputra if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) && 72903f1ecccSStephen Suryaputra net->ipv6.sysctl.icmpv6_echo_ignore_multicast) 73003f1ecccSStephen Suryaputra return; 73103f1ecccSStephen Suryaputra 7320660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 7331da177e4SLinus Torvalds 7340b03a5caSStephen Suryaputra acast = ipv6_anycast_destination(skb_dst(skb), saddr); 7350b03a5caSStephen Suryaputra if (acast && net->ipv6.sysctl.icmpv6_echo_ignore_anycast) 7360b03a5caSStephen Suryaputra return; 7370b03a5caSStephen Suryaputra 738509aba3bSFX Le Bail if (!ipv6_unicast_destination(skb) && 7390b03a5caSStephen Suryaputra !(net->ipv6.sysctl.anycast_src_echo_reply && acast)) 7401da177e4SLinus Torvalds saddr = NULL; 7411da177e4SLinus Torvalds 7421fd07f33SAndreas Roeseler if (icmph->icmp6_type == ICMPV6_EXT_ECHO_REQUEST) 7431fd07f33SAndreas Roeseler type = ICMPV6_EXT_ECHO_REPLY; 7441fd07f33SAndreas Roeseler else 7451fd07f33SAndreas Roeseler type = ICMPV6_ECHO_REPLY; 7461fd07f33SAndreas Roeseler 7471da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 7481fd07f33SAndreas Roeseler tmp_hdr.icmp6_type = type; 7491da177e4SLinus Torvalds 7504c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 751a346abe0SEric Dumazet if (net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES) 752a346abe0SEric Dumazet fl6.flowlabel = ip6_flowlabel(ipv6_hdr(skb)); 753a346abe0SEric Dumazet 7544c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 7554e3fd7a0SAlexey Dobriyan fl6.daddr = ipv6_hdr(skb)->saddr; 7561da177e4SLinus Torvalds if (saddr) 7574e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 7581b70d792SDavid Ahern fl6.flowi6_oif = icmp6_iif(skb); 7591fd07f33SAndreas Roeseler fl6.fl6_icmp_type = type; 760e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 761e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 7623df98d79SPaul Moore security_skb_classify_flow(skb, flowi6_to_flowi_common(&fl6)); 7631da177e4SLinus Torvalds 7647ba91ecbSJesper Dangaard Brouer local_bh_disable(); 765fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 76663159f29SIan Morris if (!sk) 7677ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 768fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 769405666dbSDenis V. Lunev 7704c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 7714c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 772c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 773c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 7741da177e4SLinus Torvalds 7754e64b1edSJoe Perches if (ip6_dst_lookup(net, sk, &dst, &fl6)) 7761da177e4SLinus Torvalds goto out; 7774c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); 778452edd59SDavid S. Miller if (IS_ERR(dst)) 779e104411bSPatrick McHardy goto out; 7801da177e4SLinus Torvalds 7810bc19985SStephen Suryaputra /* Check the ratelimit */ 7820bc19985SStephen Suryaputra if ((!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, ICMPV6_ECHO_REPLY)) || 7830bc19985SStephen Suryaputra !icmpv6_xrlim_allow(sk, ICMPV6_ECHO_REPLY, &fl6)) 7840bc19985SStephen Suryaputra goto out_dst_release; 7850bc19985SStephen Suryaputra 786cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds msg.skb = skb; 7891da177e4SLinus Torvalds msg.offset = 0; 7901fd07f33SAndreas Roeseler msg.type = type; 7911da177e4SLinus Torvalds 792b515430aSWillem de Bruijn ipcm6_init_sk(&ipc6, np); 79326879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 79426879da5SWei Wang ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 7950da7536fSWillem de Bruijn ipc6.sockc.mark = mark; 79626879da5SWei Wang 7971fd07f33SAndreas Roeseler if (icmph->icmp6_type == ICMPV6_EXT_ECHO_REQUEST) 7981fd07f33SAndreas Roeseler if (!icmp_build_probe(skb, (struct icmphdr *)&tmp_hdr)) 7991fd07f33SAndreas Roeseler goto out_dst_release; 8001fd07f33SAndreas Roeseler 8014e64b1edSJoe Perches if (ip6_append_data(sk, icmpv6_getfrag, &msg, 8024e64b1edSJoe Perches skb->len + sizeof(struct icmp6hdr), 80326879da5SWei Wang sizeof(struct icmp6hdr), &ipc6, &fl6, 8045fdaa88dSWillem de Bruijn (struct rt6_info *)dst, MSG_DONTWAIT)) { 805a16292a0SEric Dumazet __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 8061da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 807cfdf7647SEric Dumazet } else { 8084e64b1edSJoe Perches icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 809cfdf7647SEric Dumazet skb->len + sizeof(struct icmp6hdr)); 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(); 8171da177e4SLinus Torvalds } 8181da177e4SLinus Torvalds 819b94f1c09SDavid S. Miller void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 8201da177e4SLinus Torvalds { 821e4129440SAndrew Lunn struct inet6_skb_parm *opt = IP6CB(skb); 82241135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 8231da177e4SLinus Torvalds int inner_offset; 82475f2811cSJesse Gross __be16 frag_off; 825f9242b6bSDavid S. Miller u8 nexthdr; 8267304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 8271da177e4SLinus Torvalds 8281da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 8297304fe46SDuan Jiong goto out; 8301da177e4SLinus Torvalds 831e4129440SAndrew Lunn seg6_icmp_srh(skb, opt); 832e4129440SAndrew Lunn 8331da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 8341da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 8351da177e4SLinus Torvalds /* now skip over extension headers */ 83675f2811cSJesse Gross inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 83775f2811cSJesse Gross &nexthdr, &frag_off); 8381da177e4SLinus Torvalds if (inner_offset < 0) 8397304fe46SDuan Jiong goto out; 8401da177e4SLinus Torvalds } else { 8411da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 8421da177e4SLinus Torvalds } 8431da177e4SLinus Torvalds 8441da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 8451da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 8467304fe46SDuan Jiong goto out; 8471da177e4SLinus Torvalds 8481da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 8491da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 8501da177e4SLinus Torvalds pmtu discovery. 8511da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 8521da177e4SLinus Torvalds --ANK (980726) 8531da177e4SLinus Torvalds */ 8541da177e4SLinus Torvalds 855f9242b6bSDavid S. Miller ipprot = rcu_dereference(inet6_protos[nexthdr]); 8561da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 857e4129440SAndrew Lunn ipprot->err_handler(skb, opt, type, code, inner_offset, info); 8581da177e4SLinus Torvalds 85969d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 8607304fe46SDuan Jiong return; 8617304fe46SDuan Jiong 8627304fe46SDuan Jiong out: 863a16292a0SEric Dumazet __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); 8641da177e4SLinus Torvalds } 8651da177e4SLinus Torvalds 8661da177e4SLinus Torvalds /* 8671da177e4SLinus Torvalds * Handle icmp messages 8681da177e4SLinus Torvalds */ 8691da177e4SLinus Torvalds 870e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 8711da177e4SLinus Torvalds { 872b384c95aSMenglong Dong enum skb_drop_reason reason = SKB_DROP_REASON_NOT_SPECIFIED; 873e6f86b0fSVirgile Jarry struct net *net = dev_net(skb->dev); 874e1ae5c2eSStephen Suryaputra struct net_device *dev = icmp6_dev(skb); 8751da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 876b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 8771da177e4SLinus Torvalds struct icmp6hdr *hdr; 878d5fdd6baSBrian Haley u8 type; 8791da177e4SLinus Torvalds 880aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 881def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 8828b7817f3SHerbert Xu int nh; 8838b7817f3SHerbert Xu 884def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 885b384c95aSMenglong Dong XFRM_STATE_ICMP)) { 886b384c95aSMenglong Dong reason = SKB_DROP_REASON_XFRM_POLICY; 887aebcf82cSHerbert Xu goto drop_no_count; 888b384c95aSMenglong Dong } 889aebcf82cSHerbert Xu 89081aded24SDavid S. Miller if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) 8918b7817f3SHerbert Xu goto drop_no_count; 8928b7817f3SHerbert Xu 8938b7817f3SHerbert Xu nh = skb_network_offset(skb); 8948b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 8958b7817f3SHerbert Xu 896b384c95aSMenglong Dong if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, 897b384c95aSMenglong Dong skb)) { 898b384c95aSMenglong Dong reason = SKB_DROP_REASON_XFRM_POLICY; 8998b7817f3SHerbert Xu goto drop_no_count; 900b384c95aSMenglong Dong } 9018b7817f3SHerbert Xu 9028b7817f3SHerbert Xu skb_set_network_header(skb, nh); 9038b7817f3SHerbert Xu } 9048b7817f3SHerbert Xu 905a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS); 9061da177e4SLinus Torvalds 9070660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 9080660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 9091da177e4SLinus Torvalds 91039471ac8STom Herbert if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { 911ba7a46f1SJoe Perches net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", 9120c6ce78aSHarvey Harrison saddr, daddr); 9136a5dc9e5SEric Dumazet goto csum_error; 9141da177e4SLinus Torvalds } 9151da177e4SLinus Torvalds 9168cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 9178cf22943SHerbert Xu goto discard_it; 9181da177e4SLinus Torvalds 919cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 9201da177e4SLinus Torvalds 9211da177e4SLinus Torvalds type = hdr->icmp6_type; 9221da177e4SLinus Torvalds 923f3832ed2SEric Dumazet ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type); 9241da177e4SLinus Torvalds 9251da177e4SLinus Torvalds switch (type) { 9261da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 927e6f86b0fSVirgile Jarry if (!net->ipv6.sysctl.icmpv6_echo_ignore_all) 9281da177e4SLinus Torvalds icmpv6_echo_reply(skb); 9291da177e4SLinus Torvalds break; 9301fd07f33SAndreas Roeseler case ICMPV6_EXT_ECHO_REQUEST: 9311fd07f33SAndreas Roeseler if (!net->ipv6.sysctl.icmpv6_echo_ignore_all && 9324a2f7083SKuniyuki Iwashima READ_ONCE(net->ipv4.sysctl_icmp_echo_enable_probe)) 9331fd07f33SAndreas Roeseler icmpv6_echo_reply(skb); 9341fd07f33SAndreas Roeseler break; 9351da177e4SLinus Torvalds 9361da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 937b384c95aSMenglong Dong reason = ping_rcv(skb); 9381da177e4SLinus Torvalds break; 9391da177e4SLinus Torvalds 94031433202SAndreas Roeseler case ICMPV6_EXT_ECHO_REPLY: 941b384c95aSMenglong Dong reason = ping_rcv(skb); 94231433202SAndreas Roeseler break; 94331433202SAndreas Roeseler 9441da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 9451da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 9461da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 9471da177e4SLinus Torvalds destination cache will allow to solve this problem 9481da177e4SLinus Torvalds --ANK (980726) 9491da177e4SLinus Torvalds */ 9501da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 9511da177e4SLinus Torvalds goto discard_it; 952cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 9531da177e4SLinus Torvalds 954275757e6SGustavo A. R. Silva /* to notify */ 955a8eceea8SJoe Perches fallthrough; 9561da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 9571da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 9581da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 9591da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 9601da177e4SLinus Torvalds break; 9611da177e4SLinus Torvalds 9621da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 9631da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 9641da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 9651da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 9661da177e4SLinus Torvalds case NDISC_REDIRECT: 9671da177e4SLinus Torvalds ndisc_rcv(skb); 9681da177e4SLinus Torvalds break; 9691da177e4SLinus Torvalds 9701da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 9711da177e4SLinus Torvalds igmp6_event_query(skb); 972f185de28STaehee Yoo return 0; 9731da177e4SLinus Torvalds 9741da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 9751da177e4SLinus Torvalds igmp6_event_report(skb); 976f185de28STaehee Yoo return 0; 9771da177e4SLinus Torvalds 9781da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 9791da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 9801da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 9811da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 9821da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 9831da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 9841da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 9851da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 9861da177e4SLinus Torvalds break; 9871da177e4SLinus Torvalds 9881da177e4SLinus Torvalds default: 9891da177e4SLinus Torvalds /* informational */ 9901da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 9911da177e4SLinus Torvalds break; 9921da177e4SLinus Torvalds 9934b3418fbSBjørn Mork net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n", 9944b3418fbSBjørn Mork saddr, daddr); 995ea85a0a2SDavid S. Miller 9961da177e4SLinus Torvalds /* 9971da177e4SLinus Torvalds * error of unknown type. 9981da177e4SLinus Torvalds * must pass to upper level 9991da177e4SLinus Torvalds */ 10001da177e4SLinus Torvalds 10011da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 10023ff50b79SStephen Hemminger } 10033ff50b79SStephen Hemminger 1004e3e32170SRick Jones /* until the v6 path can be better sorted assume failure and 1005e3e32170SRick Jones * preserve the status quo behaviour for the rest of the paths to here 1006e3e32170SRick Jones */ 1007b384c95aSMenglong Dong if (reason) 1008b384c95aSMenglong Dong kfree_skb_reason(skb, reason); 1009e3e32170SRick Jones else 1010b384c95aSMenglong Dong consume_skb(skb); 1011e3e32170SRick Jones 10121da177e4SLinus Torvalds return 0; 10131da177e4SLinus Torvalds 10146a5dc9e5SEric Dumazet csum_error: 1015b384c95aSMenglong Dong reason = SKB_DROP_REASON_ICMP_CSUM; 1016a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); 10171da177e4SLinus Torvalds discard_it: 1018a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS); 10198b7817f3SHerbert Xu drop_no_count: 1020b384c95aSMenglong Dong kfree_skb_reason(skb, reason); 10211da177e4SLinus Torvalds return 0; 10221da177e4SLinus Torvalds } 10231da177e4SLinus Torvalds 10244c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, 102595e41e93SYOSHIFUJI Hideaki u8 type, 102695e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 102795e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 102895e41e93SYOSHIFUJI Hideaki int oif) 102995e41e93SYOSHIFUJI Hideaki { 10304c9483b2SDavid S. Miller memset(fl6, 0, sizeof(*fl6)); 10314e3fd7a0SAlexey Dobriyan fl6->saddr = *saddr; 10324e3fd7a0SAlexey Dobriyan fl6->daddr = *daddr; 10334c9483b2SDavid S. Miller fl6->flowi6_proto = IPPROTO_ICMPV6; 10341958b856SDavid S. Miller fl6->fl6_icmp_type = type; 10351958b856SDavid S. Miller fl6->fl6_icmp_code = 0; 10364c9483b2SDavid S. Miller fl6->flowi6_oif = oif; 10373df98d79SPaul Moore security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6)); 103895e41e93SYOSHIFUJI Hideaki } 103995e41e93SYOSHIFUJI Hideaki 10406a17b961SEric Dumazet int __init icmpv6_init(void) 10411da177e4SLinus Torvalds { 10421da177e4SLinus Torvalds struct sock *sk; 10433232a1efSKefeng Wang int err, i; 10441da177e4SLinus Torvalds 10456f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 10461ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 10476a17b961SEric Dumazet SOCK_RAW, IPPROTO_ICMPV6, &init_net); 10481da177e4SLinus Torvalds if (err < 0) { 1049f3213831SJoe Perches pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", 10501da177e4SLinus Torvalds err); 10516a17b961SEric Dumazet return err; 10521da177e4SLinus Torvalds } 10531da177e4SLinus Torvalds 10546a17b961SEric Dumazet per_cpu(ipv6_icmp_sk, i) = sk; 10555c8cafd6SDenis V. Lunev 10561da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 10571da177e4SLinus Torvalds * sk_buff struct overhead. 10581da177e4SLinus Torvalds */ 105987fb4b7bSEric Dumazet sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); 10601da177e4SLinus Torvalds } 106198c6d1b2SDenis V. Lunev 106298c6d1b2SDenis V. Lunev err = -EAGAIN; 106398c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 106498c6d1b2SDenis V. Lunev goto fail; 10655f5624cfSPravin B Shelar 10665f5624cfSPravin B Shelar err = inet6_register_icmp_sender(icmp6_send); 10675f5624cfSPravin B Shelar if (err) 10685f5624cfSPravin B Shelar goto sender_reg_err; 106998c6d1b2SDenis V. Lunev return 0; 107098c6d1b2SDenis V. Lunev 10715f5624cfSPravin B Shelar sender_reg_err: 10725f5624cfSPravin B Shelar inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 107398c6d1b2SDenis V. Lunev fail: 1074f3213831SJoe Perches pr_err("Failed to register ICMP6 protocol\n"); 107598c6d1b2SDenis V. Lunev return err; 107698c6d1b2SDenis V. Lunev } 107798c6d1b2SDenis V. Lunev 10788ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 107998c6d1b2SDenis V. Lunev { 10805f5624cfSPravin B Shelar inet6_unregister_icmp_sender(icmp6_send); 10811da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 10821da177e4SLinus Torvalds } 10831da177e4SLinus Torvalds 108498c6d1b2SDenis V. Lunev 10859b5b5cffSArjan van de Ven static const struct icmp6_err { 10861da177e4SLinus Torvalds int err; 10871da177e4SLinus Torvalds int fatal; 10881da177e4SLinus Torvalds } tab_unreach[] = { 10891da177e4SLinus Torvalds { /* NOROUTE */ 10901da177e4SLinus Torvalds .err = ENETUNREACH, 10911da177e4SLinus Torvalds .fatal = 0, 10921da177e4SLinus Torvalds }, 10931da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 10941da177e4SLinus Torvalds .err = EACCES, 10951da177e4SLinus Torvalds .fatal = 1, 10961da177e4SLinus Torvalds }, 10971da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 10981da177e4SLinus Torvalds .err = EHOSTUNREACH, 10991da177e4SLinus Torvalds .fatal = 0, 11001da177e4SLinus Torvalds }, 11011da177e4SLinus Torvalds { /* ADDR_UNREACH */ 11021da177e4SLinus Torvalds .err = EHOSTUNREACH, 11031da177e4SLinus Torvalds .fatal = 0, 11041da177e4SLinus Torvalds }, 11051da177e4SLinus Torvalds { /* PORT_UNREACH */ 11061da177e4SLinus Torvalds .err = ECONNREFUSED, 11071da177e4SLinus Torvalds .fatal = 1, 11081da177e4SLinus Torvalds }, 110961e76b17SJiri Bohac { /* POLICY_FAIL */ 111061e76b17SJiri Bohac .err = EACCES, 111161e76b17SJiri Bohac .fatal = 1, 111261e76b17SJiri Bohac }, 111361e76b17SJiri Bohac { /* REJECT_ROUTE */ 111461e76b17SJiri Bohac .err = EACCES, 111561e76b17SJiri Bohac .fatal = 1, 111661e76b17SJiri Bohac }, 11171da177e4SLinus Torvalds }; 11181da177e4SLinus Torvalds 1119d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 11201da177e4SLinus Torvalds { 11211da177e4SLinus Torvalds int fatal = 0; 11221da177e4SLinus Torvalds 11231da177e4SLinus Torvalds *err = EPROTO; 11241da177e4SLinus Torvalds 11251da177e4SLinus Torvalds switch (type) { 11261da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 11271da177e4SLinus Torvalds fatal = 1; 112861e76b17SJiri Bohac if (code < ARRAY_SIZE(tab_unreach)) { 11291da177e4SLinus Torvalds *err = tab_unreach[code].err; 11301da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 11311da177e4SLinus Torvalds } 11321da177e4SLinus Torvalds break; 11331da177e4SLinus Torvalds 11341da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 11351da177e4SLinus Torvalds *err = EMSGSIZE; 11361da177e4SLinus Torvalds break; 11371da177e4SLinus Torvalds 11381da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 11391da177e4SLinus Torvalds *err = EPROTO; 11401da177e4SLinus Torvalds fatal = 1; 11411da177e4SLinus Torvalds break; 11421da177e4SLinus Torvalds 11431da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 11441da177e4SLinus Torvalds *err = EHOSTUNREACH; 11451da177e4SLinus Torvalds break; 11463ff50b79SStephen Hemminger } 11471da177e4SLinus Torvalds 11481da177e4SLinus Torvalds return fatal; 11491da177e4SLinus Torvalds } 11507159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 11517159039aSYOSHIFUJI Hideaki 11521da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 1153e8243534Sstephen hemminger static struct ctl_table ipv6_icmp_table_template[] = { 11541da177e4SLinus Torvalds { 11551da177e4SLinus Torvalds .procname = "ratelimit", 115641a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 11571da177e4SLinus Torvalds .maxlen = sizeof(int), 11581da177e4SLinus Torvalds .mode = 0644, 11596d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 11601da177e4SLinus Torvalds }, 1161e6f86b0fSVirgile Jarry { 1162e6f86b0fSVirgile Jarry .procname = "echo_ignore_all", 1163e6f86b0fSVirgile Jarry .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_all, 1164a6175633SEric Dumazet .maxlen = sizeof(u8), 1165e6f86b0fSVirgile Jarry .mode = 0644, 1166a6175633SEric Dumazet .proc_handler = proc_dou8vec_minmax, 1167e6f86b0fSVirgile Jarry }, 116803f1ecccSStephen Suryaputra { 116903f1ecccSStephen Suryaputra .procname = "echo_ignore_multicast", 117003f1ecccSStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_multicast, 1171a6175633SEric Dumazet .maxlen = sizeof(u8), 117203f1ecccSStephen Suryaputra .mode = 0644, 1173a6175633SEric Dumazet .proc_handler = proc_dou8vec_minmax, 117403f1ecccSStephen Suryaputra }, 11750b03a5caSStephen Suryaputra { 11760b03a5caSStephen Suryaputra .procname = "echo_ignore_anycast", 11770b03a5caSStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_anycast, 1178a6175633SEric Dumazet .maxlen = sizeof(u8), 11790b03a5caSStephen Suryaputra .mode = 0644, 1180a6175633SEric Dumazet .proc_handler = proc_dou8vec_minmax, 11810b03a5caSStephen Suryaputra }, 11820bc19985SStephen Suryaputra { 11830bc19985SStephen Suryaputra .procname = "ratemask", 11840bc19985SStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_ratemask_ptr, 11850bc19985SStephen Suryaputra .maxlen = ICMPV6_MSG_MAX + 1, 11860bc19985SStephen Suryaputra .mode = 0644, 11870bc19985SStephen Suryaputra .proc_handler = proc_do_large_bitmap, 11880bc19985SStephen Suryaputra }, 1189f8572d8fSEric W. Biederman { }, 11901da177e4SLinus Torvalds }; 1191760f2d01SDaniel Lezcano 11922c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 1193760f2d01SDaniel Lezcano { 1194760f2d01SDaniel Lezcano struct ctl_table *table; 1195760f2d01SDaniel Lezcano 1196760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 1197760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 1198760f2d01SDaniel Lezcano GFP_KERNEL); 11995ee09105SYOSHIFUJI Hideaki 1200e6f86b0fSVirgile Jarry if (table) { 12015ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 1202e6f86b0fSVirgile Jarry table[1].data = &net->ipv6.sysctl.icmpv6_echo_ignore_all; 120303f1ecccSStephen Suryaputra table[2].data = &net->ipv6.sysctl.icmpv6_echo_ignore_multicast; 12040b03a5caSStephen Suryaputra table[3].data = &net->ipv6.sysctl.icmpv6_echo_ignore_anycast; 12050bc19985SStephen Suryaputra table[4].data = &net->ipv6.sysctl.icmpv6_ratemask_ptr; 1206e6f86b0fSVirgile Jarry } 1207760f2d01SDaniel Lezcano return table; 1208760f2d01SDaniel Lezcano } 12091da177e4SLinus Torvalds #endif 1210