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> 601da177e4SLinus Torvalds #include <net/transp_v6.h> 611da177e4SLinus Torvalds #include <net/ip6_route.h> 621da177e4SLinus Torvalds #include <net/addrconf.h> 631da177e4SLinus Torvalds #include <net/icmp.h> 648b7817f3SHerbert Xu #include <net/xfrm.h> 651ed8516fSDenis V. Lunev #include <net/inet_common.h> 66825edac4SHannes Frederic Sowa #include <net/dsfield.h> 67ca254490SDavid Ahern #include <net/l3mdev.h> 681da177e4SLinus Torvalds 697c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds /* 721da177e4SLinus Torvalds * The ICMP socket(s). This is the most convenient way to flow control 731da177e4SLinus Torvalds * our ICMP output as well as maintain a clean interface throughout 741da177e4SLinus Torvalds * all layers. All Socketless IP sends will soon be gone. 751da177e4SLinus Torvalds * 761da177e4SLinus Torvalds * On SMP we have one ICMP socket per-cpu. 771da177e4SLinus Torvalds */ 782789c14dSEric Dumazet static struct sock *icmpv6_sk(struct net *net) 7998c6d1b2SDenis V. Lunev { 802789c14dSEric Dumazet return this_cpu_read(*net->ipv6.icmp_sk); 8198c6d1b2SDenis V. Lunev } 821da177e4SLinus Torvalds 8332bbd879SStefano Brivio static int icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 846f809da2SSteffen Klassert u8 type, u8 code, int offset, __be32 info) 856f809da2SSteffen Klassert { 866d0bfe22SLorenzo Colitti /* icmpv6_notify checks 8 bytes can be pulled, icmp6hdr is 8 bytes */ 876d0bfe22SLorenzo Colitti struct icmp6hdr *icmp6 = (struct icmp6hdr *) (skb->data + offset); 886f809da2SSteffen Klassert struct net *net = dev_net(skb->dev); 896f809da2SSteffen Klassert 906f809da2SSteffen Klassert if (type == ICMPV6_PKT_TOOBIG) 915f379ef5SGeorg Kohmann ip6_update_pmtu(skb, net, info, skb->dev->ifindex, 0, sock_net_uid(net, NULL)); 926f809da2SSteffen Klassert else if (type == NDISC_REDIRECT) 93e2d118a1SLorenzo Colitti ip6_redirect(skb, net, skb->dev->ifindex, 0, 94e2d118a1SLorenzo Colitti sock_net_uid(net, NULL)); 956d0bfe22SLorenzo Colitti 966d0bfe22SLorenzo Colitti if (!(type & ICMPV6_INFOMSG_MASK)) 976d0bfe22SLorenzo Colitti if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST) 98dcb94b88SHannes Frederic Sowa ping_err(skb, offset, ntohl(info)); 9932bbd879SStefano Brivio 10032bbd879SStefano Brivio return 0; 1016f809da2SSteffen Klassert } 1026f809da2SSteffen Klassert 103e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb); 1041da177e4SLinus Torvalds 10541135cc8SAlexey Dobriyan static const struct inet6_protocol icmpv6_protocol = { 1061da177e4SLinus Torvalds .handler = icmpv6_rcv, 1076f809da2SSteffen Klassert .err_handler = icmpv6_err, 1088b7817f3SHerbert Xu .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1091da177e4SLinus Torvalds }; 1101da177e4SLinus Torvalds 1117ba91ecbSJesper Dangaard Brouer /* Called with BH disabled */ 112fdc0bde9SDenis V. Lunev static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) 1131da177e4SLinus Torvalds { 114fdc0bde9SDenis V. Lunev struct sock *sk; 115fdc0bde9SDenis V. Lunev 116fdc0bde9SDenis V. Lunev sk = icmpv6_sk(net); 117405666dbSDenis V. Lunev if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { 1181da177e4SLinus Torvalds /* This can happen if the output path (f.e. SIT or 1191da177e4SLinus Torvalds * ip6ip6 tunnel) signals dst_link_failure() for an 1201da177e4SLinus Torvalds * outgoing ICMP6 packet. 1211da177e4SLinus Torvalds */ 122fdc0bde9SDenis V. Lunev return NULL; 1231da177e4SLinus Torvalds } 124fdc0bde9SDenis V. Lunev return sk; 1251da177e4SLinus Torvalds } 1261da177e4SLinus Torvalds 127405666dbSDenis V. Lunev static __inline__ void icmpv6_xmit_unlock(struct sock *sk) 1281da177e4SLinus Torvalds { 1297ba91ecbSJesper Dangaard Brouer spin_unlock(&sk->sk_lock.slock); 1301da177e4SLinus Torvalds } 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds /* 1331da177e4SLinus Torvalds * Figure out, may we reply to this packet with icmp error. 1341da177e4SLinus Torvalds * 1351da177e4SLinus Torvalds * We do not reply, if: 1361da177e4SLinus Torvalds * - it was icmp error message. 1371da177e4SLinus Torvalds * - it is truncated, so that it is known, that protocol is ICMPV6 1381da177e4SLinus Torvalds * (i.e. in the middle of some exthdr) 1391da177e4SLinus Torvalds * 1401da177e4SLinus Torvalds * --ANK (980726) 1411da177e4SLinus Torvalds */ 1421da177e4SLinus Torvalds 143a50feda5SEric Dumazet static bool is_ineligible(const struct sk_buff *skb) 1441da177e4SLinus Torvalds { 1450660e03fSArnaldo Carvalho de Melo int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; 1461da177e4SLinus Torvalds int len = skb->len - ptr; 1470660e03fSArnaldo Carvalho de Melo __u8 nexthdr = ipv6_hdr(skb)->nexthdr; 14875f2811cSJesse Gross __be16 frag_off; 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds if (len < 0) 151a50feda5SEric Dumazet return true; 1521da177e4SLinus Torvalds 15375f2811cSJesse Gross ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off); 1541da177e4SLinus Torvalds if (ptr < 0) 155a50feda5SEric Dumazet return false; 1561da177e4SLinus Torvalds if (nexthdr == IPPROTO_ICMPV6) { 1571da177e4SLinus Torvalds u8 _type, *tp; 1581da177e4SLinus Torvalds tp = skb_header_pointer(skb, 1591da177e4SLinus Torvalds ptr+offsetof(struct icmp6hdr, icmp6_type), 1601da177e4SLinus Torvalds sizeof(_type), &_type); 16163159f29SIan Morris if (!tp || !(*tp & ICMPV6_INFOMSG_MASK)) 162a50feda5SEric Dumazet return true; 1631da177e4SLinus Torvalds } 164a50feda5SEric Dumazet return false; 1651da177e4SLinus Torvalds } 1661da177e4SLinus Torvalds 1670bc19985SStephen Suryaputra static bool icmpv6_mask_allow(struct net *net, int type) 168c0303efeSJesper Dangaard Brouer { 1690bc19985SStephen Suryaputra if (type > ICMPV6_MSG_MAX) 170c0303efeSJesper Dangaard Brouer return true; 171c0303efeSJesper Dangaard Brouer 1720bc19985SStephen Suryaputra /* Limit if icmp type is set in ratemask. */ 1730bc19985SStephen Suryaputra if (!test_bit(type, net->ipv6.sysctl.icmpv6_ratemask)) 174c0303efeSJesper Dangaard Brouer return true; 175c0303efeSJesper Dangaard Brouer 176c0303efeSJesper Dangaard Brouer return false; 177c0303efeSJesper Dangaard Brouer } 178c0303efeSJesper Dangaard Brouer 1790bc19985SStephen Suryaputra static bool icmpv6_global_allow(struct net *net, int type) 180c0303efeSJesper Dangaard Brouer { 1810bc19985SStephen Suryaputra if (icmpv6_mask_allow(net, type)) 182c0303efeSJesper Dangaard Brouer return true; 183c0303efeSJesper Dangaard Brouer 184c0303efeSJesper Dangaard Brouer if (icmp_global_allow()) 185c0303efeSJesper Dangaard Brouer return true; 186c0303efeSJesper Dangaard Brouer 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 } 2281da177e4SLinus Torvalds dst_release(dst); 2291da177e4SLinus Torvalds return res; 2301da177e4SLinus Torvalds } 2311da177e4SLinus Torvalds 232b93cfb9cSTim Stallard static bool icmpv6_rt_has_prefsrc(struct sock *sk, u8 type, 233b93cfb9cSTim Stallard struct flowi6 *fl6) 234b93cfb9cSTim Stallard { 235b93cfb9cSTim Stallard struct net *net = sock_net(sk); 236b93cfb9cSTim Stallard struct dst_entry *dst; 237b93cfb9cSTim Stallard bool res = false; 238b93cfb9cSTim Stallard 239b93cfb9cSTim Stallard dst = ip6_route_output(net, sk, fl6); 240b93cfb9cSTim Stallard if (!dst->error) { 241b93cfb9cSTim Stallard struct rt6_info *rt = (struct rt6_info *)dst; 242b93cfb9cSTim Stallard struct in6_addr prefsrc; 243b93cfb9cSTim Stallard 244b93cfb9cSTim Stallard rt6_get_prefsrc(rt, &prefsrc); 245b93cfb9cSTim Stallard res = !ipv6_addr_any(&prefsrc); 246b93cfb9cSTim Stallard } 247b93cfb9cSTim Stallard dst_release(dst); 248b93cfb9cSTim Stallard return res; 249b93cfb9cSTim Stallard } 250b93cfb9cSTim Stallard 2511da177e4SLinus Torvalds /* 2521da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2531da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2541da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2551da177e4SLinus Torvalds * highest-order two bits set to 10 2561da177e4SLinus Torvalds */ 2571da177e4SLinus Torvalds 258a50feda5SEric Dumazet static bool opt_unrec(struct sk_buff *skb, __u32 offset) 2591da177e4SLinus Torvalds { 2601da177e4SLinus Torvalds u8 _optval, *op; 2611da177e4SLinus Torvalds 262bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2631da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 26463159f29SIan Morris if (!op) 265a50feda5SEric Dumazet return true; 2661da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2671da177e4SLinus Torvalds } 2681da177e4SLinus Torvalds 2694e64b1edSJoe Perches void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 2706d0bfe22SLorenzo Colitti struct icmp6hdr *thdr, int len) 2711da177e4SLinus Torvalds { 2721da177e4SLinus Torvalds struct sk_buff *skb; 2731da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2741da177e4SLinus Torvalds 275e5d08d71SIan Morris skb = skb_peek(&sk->sk_write_queue); 27663159f29SIan Morris if (!skb) 2774e64b1edSJoe Perches return; 2781da177e4SLinus Torvalds 279cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2801da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2811da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2821da177e4SLinus Torvalds 2831da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 28407f0757aSJoe Perches skb->csum = csum_partial(icmp6h, 2851da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2864c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2874c9483b2SDavid S. Miller &fl6->daddr, 2884c9483b2SDavid S. Miller len, fl6->flowi6_proto, 2891da177e4SLinus Torvalds skb->csum); 2901da177e4SLinus Torvalds } else { 291868c86bcSAl Viro __wsum tmp_csum = 0; 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2941da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2951da177e4SLinus Torvalds } 2961da177e4SLinus Torvalds 29707f0757aSJoe Perches tmp_csum = csum_partial(icmp6h, 2981da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 2994c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 3004c9483b2SDavid S. Miller &fl6->daddr, 3014c9483b2SDavid S. Miller len, fl6->flowi6_proto, 302868c86bcSAl Viro tmp_csum); 3031da177e4SLinus Torvalds } 3041da177e4SLinus Torvalds ip6_push_pending_frames(sk); 3051da177e4SLinus Torvalds } 3061da177e4SLinus Torvalds 3071da177e4SLinus Torvalds struct icmpv6_msg { 3081da177e4SLinus Torvalds struct sk_buff *skb; 3091da177e4SLinus Torvalds int offset; 310763ecff1SYasuyuki Kozakai uint8_t type; 3111da177e4SLinus Torvalds }; 3121da177e4SLinus Torvalds 3131da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 3141da177e4SLinus Torvalds { 3151da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 3161da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 3178d5930dfSAl Viro __wsum csum; 3181da177e4SLinus Torvalds 3191da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 3208d5930dfSAl Viro to, len); 3211da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 322763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 323763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 3241da177e4SLinus Torvalds return 0; 3251da177e4SLinus Torvalds } 3261da177e4SLinus Torvalds 32707a93626SAmerigo Wang #if IS_ENABLED(CONFIG_IPV6_MIP6) 32879383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 32979383236SMasahide NAKAMURA { 3300660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 33179383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 33279383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 33379383236SMasahide NAKAMURA struct in6_addr tmp; 33479383236SMasahide NAKAMURA int off; 33579383236SMasahide NAKAMURA 33679383236SMasahide NAKAMURA if (opt->dsthao) { 33779383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 33879383236SMasahide NAKAMURA if (likely(off >= 0)) { 339d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 340d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 3414e3fd7a0SAlexey Dobriyan tmp = iph->saddr; 3424e3fd7a0SAlexey Dobriyan iph->saddr = hao->addr; 3434e3fd7a0SAlexey Dobriyan hao->addr = tmp; 34479383236SMasahide NAKAMURA } 34579383236SMasahide NAKAMURA } 34679383236SMasahide NAKAMURA } 34779383236SMasahide NAKAMURA #else 34879383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 34979383236SMasahide NAKAMURA #endif 35079383236SMasahide NAKAMURA 351e8243534Sstephen hemminger static struct dst_entry *icmpv6_route_lookup(struct net *net, 352e8243534Sstephen hemminger struct sk_buff *skb, 353e8243534Sstephen hemminger struct sock *sk, 354e8243534Sstephen hemminger struct flowi6 *fl6) 355b42835dbSDavid S. Miller { 356b42835dbSDavid S. Miller struct dst_entry *dst, *dst2; 3574c9483b2SDavid S. Miller struct flowi6 fl2; 358b42835dbSDavid S. Miller int err; 359b42835dbSDavid S. Miller 360343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst, fl6); 361b42835dbSDavid S. Miller if (err) 362b42835dbSDavid S. Miller return ERR_PTR(err); 363b42835dbSDavid S. Miller 364b42835dbSDavid S. Miller /* 365b42835dbSDavid S. Miller * We won't send icmp if the destination is known 366b42835dbSDavid S. Miller * anycast. 367b42835dbSDavid S. Miller */ 3682647a9b0SMartin KaFai Lau if (ipv6_anycast_destination(dst, &fl6->daddr)) { 369ba7a46f1SJoe Perches net_dbg_ratelimited("icmp6_send: acast source\n"); 370b42835dbSDavid S. Miller dst_release(dst); 371b42835dbSDavid S. Miller return ERR_PTR(-EINVAL); 372b42835dbSDavid S. Miller } 373b42835dbSDavid S. Miller 374b42835dbSDavid S. Miller /* No need to clone since we're just using its address. */ 375b42835dbSDavid S. Miller dst2 = dst; 376b42835dbSDavid S. Miller 3774c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); 378452edd59SDavid S. Miller if (!IS_ERR(dst)) { 379b42835dbSDavid S. Miller if (dst != dst2) 380b42835dbSDavid S. Miller return dst; 381452edd59SDavid S. Miller } else { 382452edd59SDavid S. Miller if (PTR_ERR(dst) == -EPERM) 383b42835dbSDavid S. Miller dst = NULL; 384452edd59SDavid S. Miller else 385452edd59SDavid S. Miller return dst; 386b42835dbSDavid S. Miller } 387b42835dbSDavid S. Miller 3884c9483b2SDavid S. Miller err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); 389b42835dbSDavid S. Miller if (err) 390b42835dbSDavid S. Miller goto relookup_failed; 391b42835dbSDavid S. Miller 392343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst2, &fl2); 393b42835dbSDavid S. Miller if (err) 394b42835dbSDavid S. Miller goto relookup_failed; 395b42835dbSDavid S. Miller 3964c9483b2SDavid S. Miller dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); 397452edd59SDavid S. Miller if (!IS_ERR(dst2)) { 398b42835dbSDavid S. Miller dst_release(dst); 399b42835dbSDavid S. Miller dst = dst2; 400452edd59SDavid S. Miller } else { 401452edd59SDavid S. Miller err = PTR_ERR(dst2); 402452edd59SDavid S. Miller if (err == -EPERM) { 403b42835dbSDavid S. Miller dst_release(dst); 404452edd59SDavid S. Miller return dst2; 405452edd59SDavid S. Miller } else 406b42835dbSDavid S. Miller goto relookup_failed; 407b42835dbSDavid S. Miller } 408b42835dbSDavid S. Miller 409b42835dbSDavid S. Miller relookup_failed: 410b42835dbSDavid S. Miller if (dst) 411b42835dbSDavid S. Miller return dst; 412b42835dbSDavid S. Miller return ERR_PTR(err); 413b42835dbSDavid S. Miller } 414b42835dbSDavid S. Miller 415e1ae5c2eSStephen Suryaputra static struct net_device *icmp6_dev(const struct sk_buff *skb) 4161b70d792SDavid Ahern { 417e1ae5c2eSStephen Suryaputra struct net_device *dev = skb->dev; 4181b70d792SDavid Ahern 4191b70d792SDavid Ahern /* for local traffic to local address, skb dev is the loopback 4201b70d792SDavid Ahern * device. Check if there is a dst attached to the skb and if so 42124b711edSDavid Ahern * get the real device index. Same is needed for replies to a link 42224b711edSDavid Ahern * local address on a device enslaved to an L3 master device 4231b70d792SDavid Ahern */ 424e1ae5c2eSStephen Suryaputra if (unlikely(dev->ifindex == LOOPBACK_IFINDEX || netif_is_l3_master(skb->dev))) { 4251b70d792SDavid Ahern const struct rt6_info *rt6 = skb_rt6_info(skb); 4261b70d792SDavid Ahern 4271b70d792SDavid Ahern if (rt6) 428e1ae5c2eSStephen Suryaputra dev = rt6->rt6i_idev->dev; 4291b70d792SDavid Ahern } 4301b70d792SDavid Ahern 431e1ae5c2eSStephen Suryaputra return dev; 432e1ae5c2eSStephen Suryaputra } 433e1ae5c2eSStephen Suryaputra 434e1ae5c2eSStephen Suryaputra static int icmp6_iif(const struct sk_buff *skb) 435e1ae5c2eSStephen Suryaputra { 436e1ae5c2eSStephen Suryaputra return icmp6_dev(skb)->ifindex; 4371b70d792SDavid Ahern } 4381b70d792SDavid Ahern 4391da177e4SLinus Torvalds /* 4401da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 4411da177e4SLinus Torvalds */ 442cc7a21b6SEric Dumazet void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info, 443b1cadc1aSEric Dumazet const struct in6_addr *force_saddr) 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 { 50479dc7e3fSDavid Ahern dst = skb_dst(skb); 50579dc7e3fSDavid Ahern iif = l3mdev_master_ifindex(dst ? dst->dev : skb->dev); 50679dc7e3fSDavid Ahern } 5071da177e4SLinus Torvalds 5081da177e4SLinus Torvalds /* 5098de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 5108de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 5118de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 5128de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 5131da177e4SLinus Torvalds */ 5141da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 5154b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n", 5164b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5171da177e4SLinus Torvalds return; 5181da177e4SLinus Torvalds } 5191da177e4SLinus Torvalds 5201da177e4SLinus Torvalds /* 5211da177e4SLinus Torvalds * Never answer to a ICMP packet. 5221da177e4SLinus Torvalds */ 5231da177e4SLinus Torvalds if (is_ineligible(skb)) { 5244b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n", 5254b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5261da177e4SLinus Torvalds return; 5271da177e4SLinus Torvalds } 5281da177e4SLinus Torvalds 5297ba91ecbSJesper Dangaard Brouer /* Needed by both icmp_global_allow and icmpv6_xmit_lock */ 5307ba91ecbSJesper Dangaard Brouer local_bh_disable(); 5317ba91ecbSJesper Dangaard Brouer 5327ba91ecbSJesper Dangaard Brouer /* Check global sysctl_icmp_msgs_per_sec ratelimit */ 5330bc19985SStephen Suryaputra if (!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, type)) 5347ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 5357ba91ecbSJesper Dangaard Brouer 53679383236SMasahide NAKAMURA mip6_addr_swap(skb); 53779383236SMasahide NAKAMURA 538fac6fce9SFrancesco Ruggeri sk = icmpv6_xmit_lock(net); 539fac6fce9SFrancesco Ruggeri if (!sk) 540fac6fce9SFrancesco Ruggeri goto out_bh_enable; 541fac6fce9SFrancesco Ruggeri 5424c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 5434c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 5444e3fd7a0SAlexey Dobriyan fl6.daddr = hdr->saddr; 545b1cadc1aSEric Dumazet if (force_saddr) 546b1cadc1aSEric Dumazet saddr = force_saddr; 547fac6fce9SFrancesco Ruggeri if (saddr) { 5484e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 549b93cfb9cSTim Stallard } else if (!icmpv6_rt_has_prefsrc(sk, type, &fl6)) { 550fac6fce9SFrancesco Ruggeri /* select a more meaningful saddr from input if */ 551fac6fce9SFrancesco Ruggeri struct net_device *in_netdev; 552fac6fce9SFrancesco Ruggeri 553fac6fce9SFrancesco Ruggeri in_netdev = dev_get_by_index(net, IP6CB(skb)->iif); 554fac6fce9SFrancesco Ruggeri if (in_netdev) { 555fac6fce9SFrancesco Ruggeri ipv6_dev_get_saddr(net, in_netdev, &fl6.daddr, 556fac6fce9SFrancesco Ruggeri inet6_sk(sk)->srcprefs, 557fac6fce9SFrancesco Ruggeri &fl6.saddr); 558fac6fce9SFrancesco Ruggeri dev_put(in_netdev); 559fac6fce9SFrancesco Ruggeri } 560fac6fce9SFrancesco Ruggeri } 561e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 5624c9483b2SDavid S. Miller fl6.flowi6_oif = iif; 5631958b856SDavid S. Miller fl6.fl6_icmp_type = type; 5641958b856SDavid S. Miller fl6.fl6_icmp_code = code; 565e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 566b4bac172SDavid Ahern fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, NULL); 5674c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 5681da177e4SLinus Torvalds 569fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 570405666dbSDenis V. Lunev 5714c9483b2SDavid S. Miller if (!icmpv6_xrlim_allow(sk, type, &fl6)) 5721da177e4SLinus Torvalds goto out; 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 5751da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 5761da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 5771da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 5781da177e4SLinus Torvalds 5794c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 5804c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 581c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 582c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 5831da177e4SLinus Torvalds 584b515430aSWillem de Bruijn ipcm6_init_sk(&ipc6, np); 5850da7536fSWillem de Bruijn ipc6.sockc.mark = mark; 58638b7097bSHannes Frederic Sowa fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 58738b7097bSHannes Frederic Sowa 5884c9483b2SDavid S. Miller dst = icmpv6_route_lookup(net, skb, sk, &fl6); 589b42835dbSDavid S. Miller if (IS_ERR(dst)) 5901da177e4SLinus Torvalds goto out; 5918de3351eSYOSHIFUJI Hideaki 59226879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 5931da177e4SLinus Torvalds 5941da177e4SLinus Torvalds msg.skb = skb; 595bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 596763ecff1SYasuyuki Kozakai msg.type = type; 5971da177e4SLinus Torvalds 5981da177e4SLinus Torvalds len = skb->len - msg.offset; 5991da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); 6001da177e4SLinus Torvalds if (len < 0) { 6014b3418fbSBjørn Mork net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n", 6024b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 6031da177e4SLinus Torvalds goto out_dst_release; 6041da177e4SLinus Torvalds } 6051da177e4SLinus Torvalds 606cfdf7647SEric Dumazet rcu_read_lock(); 607cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 6081da177e4SLinus Torvalds 6094e64b1edSJoe Perches if (ip6_append_data(sk, icmpv6_getfrag, &msg, 6101da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 61126879da5SWei Wang sizeof(struct icmp6hdr), 61226879da5SWei Wang &ipc6, &fl6, (struct rt6_info *)dst, 6135fdaa88dSWillem de Bruijn MSG_DONTWAIT)) { 61443a43b60SHannes Frederic Sowa ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 6151da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 616cfdf7647SEric Dumazet } else { 6174e64b1edSJoe Perches icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 618cfdf7647SEric Dumazet len + sizeof(struct icmp6hdr)); 6191da177e4SLinus Torvalds } 620cfdf7647SEric Dumazet rcu_read_unlock(); 6211da177e4SLinus Torvalds out_dst_release: 6221da177e4SLinus Torvalds dst_release(dst); 6231da177e4SLinus Torvalds out: 624405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 6257ba91ecbSJesper Dangaard Brouer out_bh_enable: 6267ba91ecbSJesper Dangaard Brouer local_bh_enable(); 6271da177e4SLinus Torvalds } 628cc7a21b6SEric Dumazet EXPORT_SYMBOL(icmp6_send); 6295f5624cfSPravin B Shelar 6305f5624cfSPravin B Shelar /* Slightly more convenient version of icmp6_send. 6315f5624cfSPravin B Shelar */ 6325f5624cfSPravin B Shelar void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) 6335f5624cfSPravin B Shelar { 634b1cadc1aSEric Dumazet icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL); 6355f5624cfSPravin B Shelar kfree_skb(skb); 6365f5624cfSPravin B Shelar } 6377159039aSYOSHIFUJI Hideaki 6385fbba8acSEric Dumazet /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH 6395fbba8acSEric Dumazet * if sufficient data bytes are available 6405fbba8acSEric Dumazet * @nhs is the size of the tunnel header(s) : 6415fbba8acSEric Dumazet * Either an IPv4 header for SIT encap 6425fbba8acSEric Dumazet * an IPv4 header + GRE header for GRE encap 6435fbba8acSEric Dumazet */ 64420e1954fSEric Dumazet int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type, 64520e1954fSEric Dumazet unsigned int data_len) 6465fbba8acSEric Dumazet { 6472d7a3b27SEric Dumazet struct in6_addr temp_saddr; 6485fbba8acSEric Dumazet struct rt6_info *rt; 6495fbba8acSEric Dumazet struct sk_buff *skb2; 65020e1954fSEric Dumazet u32 info = 0; 6515fbba8acSEric Dumazet 6525fbba8acSEric Dumazet if (!pskb_may_pull(skb, nhs + sizeof(struct ipv6hdr) + 8)) 6535fbba8acSEric Dumazet return 1; 6545fbba8acSEric Dumazet 65520e1954fSEric Dumazet /* RFC 4884 (partial) support for ICMP extensions */ 65620e1954fSEric Dumazet if (data_len < 128 || (data_len & 7) || skb->len < data_len) 65720e1954fSEric Dumazet data_len = 0; 65820e1954fSEric Dumazet 65920e1954fSEric Dumazet skb2 = data_len ? skb_copy(skb, GFP_ATOMIC) : skb_clone(skb, GFP_ATOMIC); 6605fbba8acSEric Dumazet 6615fbba8acSEric Dumazet if (!skb2) 6625fbba8acSEric Dumazet return 1; 6635fbba8acSEric Dumazet 6645fbba8acSEric Dumazet skb_dst_drop(skb2); 6655fbba8acSEric Dumazet skb_pull(skb2, nhs); 6665fbba8acSEric Dumazet skb_reset_network_header(skb2); 6675fbba8acSEric Dumazet 668b75cc8f9SDavid Ahern rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 669b75cc8f9SDavid Ahern skb, 0); 6705fbba8acSEric Dumazet 6715fbba8acSEric Dumazet if (rt && rt->dst.dev) 6725fbba8acSEric Dumazet skb2->dev = rt->dst.dev; 6735fbba8acSEric Dumazet 6742d7a3b27SEric Dumazet ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr); 67520e1954fSEric Dumazet 67620e1954fSEric Dumazet if (data_len) { 67720e1954fSEric Dumazet /* RFC 4884 (partial) support : 67820e1954fSEric Dumazet * insert 0 padding at the end, before the extensions 67920e1954fSEric Dumazet */ 68020e1954fSEric Dumazet __skb_push(skb2, nhs); 68120e1954fSEric Dumazet skb_reset_network_header(skb2); 68220e1954fSEric Dumazet memmove(skb2->data, skb2->data + nhs, data_len - nhs); 68320e1954fSEric Dumazet memset(skb2->data + data_len - nhs, 0, nhs); 68420e1954fSEric Dumazet /* RFC 4884 4.5 : Length is measured in 64-bit words, 68520e1954fSEric Dumazet * and stored in reserved[0] 68620e1954fSEric Dumazet */ 68720e1954fSEric Dumazet info = (data_len/8) << 24; 68820e1954fSEric Dumazet } 6892d7a3b27SEric Dumazet if (type == ICMP_TIME_EXCEEDED) 6902d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 69120e1954fSEric Dumazet info, &temp_saddr); 6922d7a3b27SEric Dumazet else 6932d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 69420e1954fSEric Dumazet info, &temp_saddr); 6955fbba8acSEric Dumazet if (rt) 6965fbba8acSEric Dumazet ip6_rt_put(rt); 6975fbba8acSEric Dumazet 6985fbba8acSEric Dumazet kfree_skb(skb2); 6995fbba8acSEric Dumazet 7005fbba8acSEric Dumazet return 0; 7015fbba8acSEric Dumazet } 7025fbba8acSEric Dumazet EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach); 7035fbba8acSEric Dumazet 7041da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 7051da177e4SLinus Torvalds { 706c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 70784427d53SYOSHIFUJI Hideaki struct sock *sk; 7081da177e4SLinus Torvalds struct inet6_dev *idev; 70984427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 710b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 711cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 7121da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 7134c9483b2SDavid S. Miller struct flowi6 fl6; 7141da177e4SLinus Torvalds struct icmpv6_msg msg; 7151da177e4SLinus Torvalds struct dst_entry *dst; 71626879da5SWei Wang struct ipcm6_cookie ipc6; 717e110861fSLorenzo Colitti u32 mark = IP6_REPLY_MARK(net, skb->mark); 7180b03a5caSStephen Suryaputra bool acast; 7191da177e4SLinus Torvalds 72003f1ecccSStephen Suryaputra if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) && 72103f1ecccSStephen Suryaputra net->ipv6.sysctl.icmpv6_echo_ignore_multicast) 72203f1ecccSStephen Suryaputra return; 72303f1ecccSStephen Suryaputra 7240660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 7251da177e4SLinus Torvalds 7260b03a5caSStephen Suryaputra acast = ipv6_anycast_destination(skb_dst(skb), saddr); 7270b03a5caSStephen Suryaputra if (acast && net->ipv6.sysctl.icmpv6_echo_ignore_anycast) 7280b03a5caSStephen Suryaputra return; 7290b03a5caSStephen Suryaputra 730509aba3bSFX Le Bail if (!ipv6_unicast_destination(skb) && 7310b03a5caSStephen Suryaputra !(net->ipv6.sysctl.anycast_src_echo_reply && acast)) 7321da177e4SLinus Torvalds saddr = NULL; 7331da177e4SLinus Torvalds 7341da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 7351da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 7361da177e4SLinus Torvalds 7374c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 738a346abe0SEric Dumazet if (net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES) 739a346abe0SEric Dumazet fl6.flowlabel = ip6_flowlabel(ipv6_hdr(skb)); 740a346abe0SEric Dumazet 7414c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 7424e3fd7a0SAlexey Dobriyan fl6.daddr = ipv6_hdr(skb)->saddr; 7431da177e4SLinus Torvalds if (saddr) 7444e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 7451b70d792SDavid Ahern fl6.flowi6_oif = icmp6_iif(skb); 7461958b856SDavid S. Miller fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; 747e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 748e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 7494c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 7501da177e4SLinus Torvalds 7517ba91ecbSJesper Dangaard Brouer local_bh_disable(); 752fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 75363159f29SIan Morris if (!sk) 7547ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 755fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 756405666dbSDenis V. Lunev 7574c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 7584c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 759c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 760c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 7611da177e4SLinus Torvalds 7624e64b1edSJoe Perches if (ip6_dst_lookup(net, sk, &dst, &fl6)) 7631da177e4SLinus Torvalds goto out; 7644c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); 765452edd59SDavid S. Miller if (IS_ERR(dst)) 766e104411bSPatrick McHardy goto out; 7671da177e4SLinus Torvalds 7680bc19985SStephen Suryaputra /* Check the ratelimit */ 7690bc19985SStephen Suryaputra if ((!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, ICMPV6_ECHO_REPLY)) || 7700bc19985SStephen Suryaputra !icmpv6_xrlim_allow(sk, ICMPV6_ECHO_REPLY, &fl6)) 7710bc19985SStephen Suryaputra goto out_dst_release; 7720bc19985SStephen Suryaputra 773cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 7741da177e4SLinus Torvalds 7751da177e4SLinus Torvalds msg.skb = skb; 7761da177e4SLinus Torvalds msg.offset = 0; 777763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 7781da177e4SLinus Torvalds 779b515430aSWillem de Bruijn ipcm6_init_sk(&ipc6, np); 78026879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 78126879da5SWei Wang ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 7820da7536fSWillem de Bruijn ipc6.sockc.mark = mark; 78326879da5SWei Wang 7844e64b1edSJoe Perches if (ip6_append_data(sk, icmpv6_getfrag, &msg, 7854e64b1edSJoe Perches skb->len + sizeof(struct icmp6hdr), 78626879da5SWei Wang sizeof(struct icmp6hdr), &ipc6, &fl6, 7875fdaa88dSWillem de Bruijn (struct rt6_info *)dst, MSG_DONTWAIT)) { 788a16292a0SEric Dumazet __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 7891da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 790cfdf7647SEric Dumazet } else { 7914e64b1edSJoe Perches icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 792cfdf7647SEric Dumazet skb->len + sizeof(struct icmp6hdr)); 7931da177e4SLinus Torvalds } 7940bc19985SStephen Suryaputra out_dst_release: 7951da177e4SLinus Torvalds dst_release(dst); 7961da177e4SLinus Torvalds out: 797405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 7987ba91ecbSJesper Dangaard Brouer out_bh_enable: 7997ba91ecbSJesper Dangaard Brouer local_bh_enable(); 8001da177e4SLinus Torvalds } 8011da177e4SLinus Torvalds 802b94f1c09SDavid S. Miller void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 8031da177e4SLinus Torvalds { 80441135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 8051da177e4SLinus Torvalds int inner_offset; 80675f2811cSJesse Gross __be16 frag_off; 807f9242b6bSDavid S. Miller u8 nexthdr; 8087304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 8091da177e4SLinus Torvalds 8101da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 8117304fe46SDuan Jiong goto out; 8121da177e4SLinus Torvalds 8131da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 8141da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 8151da177e4SLinus Torvalds /* now skip over extension headers */ 81675f2811cSJesse Gross inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 81775f2811cSJesse Gross &nexthdr, &frag_off); 8181da177e4SLinus Torvalds if (inner_offset < 0) 8197304fe46SDuan Jiong goto out; 8201da177e4SLinus Torvalds } else { 8211da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 8221da177e4SLinus Torvalds } 8231da177e4SLinus Torvalds 8241da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 8251da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 8267304fe46SDuan Jiong goto out; 8271da177e4SLinus Torvalds 8281da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 8291da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 8301da177e4SLinus Torvalds pmtu discovery. 8311da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 8321da177e4SLinus Torvalds --ANK (980726) 8331da177e4SLinus Torvalds */ 8341da177e4SLinus Torvalds 835f9242b6bSDavid S. Miller ipprot = rcu_dereference(inet6_protos[nexthdr]); 8361da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 8371da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 8381da177e4SLinus Torvalds 83969d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 8407304fe46SDuan Jiong return; 8417304fe46SDuan Jiong 8427304fe46SDuan Jiong out: 843a16292a0SEric Dumazet __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); 8441da177e4SLinus Torvalds } 8451da177e4SLinus Torvalds 8461da177e4SLinus Torvalds /* 8471da177e4SLinus Torvalds * Handle icmp messages 8481da177e4SLinus Torvalds */ 8491da177e4SLinus Torvalds 850e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 8511da177e4SLinus Torvalds { 852e6f86b0fSVirgile Jarry struct net *net = dev_net(skb->dev); 853e1ae5c2eSStephen Suryaputra struct net_device *dev = icmp6_dev(skb); 8541da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 855b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 8561da177e4SLinus Torvalds struct icmp6hdr *hdr; 857d5fdd6baSBrian Haley u8 type; 858e3e32170SRick Jones bool success = false; 8591da177e4SLinus Torvalds 860aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 861def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 8628b7817f3SHerbert Xu int nh; 8638b7817f3SHerbert Xu 864def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 865aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 866aebcf82cSHerbert Xu goto drop_no_count; 867aebcf82cSHerbert Xu 86881aded24SDavid S. Miller if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) 8698b7817f3SHerbert Xu goto drop_no_count; 8708b7817f3SHerbert Xu 8718b7817f3SHerbert Xu nh = skb_network_offset(skb); 8728b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 8738b7817f3SHerbert Xu 8748b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 8758b7817f3SHerbert Xu goto drop_no_count; 8768b7817f3SHerbert Xu 8778b7817f3SHerbert Xu skb_set_network_header(skb, nh); 8788b7817f3SHerbert Xu } 8798b7817f3SHerbert Xu 880a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS); 8811da177e4SLinus Torvalds 8820660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 8830660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 8841da177e4SLinus Torvalds 88539471ac8STom Herbert if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { 886ba7a46f1SJoe Perches net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", 8870c6ce78aSHarvey Harrison saddr, daddr); 8886a5dc9e5SEric Dumazet goto csum_error; 8891da177e4SLinus Torvalds } 8901da177e4SLinus Torvalds 8918cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 8928cf22943SHerbert Xu goto discard_it; 8931da177e4SLinus Torvalds 894cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 8951da177e4SLinus Torvalds 8961da177e4SLinus Torvalds type = hdr->icmp6_type; 8971da177e4SLinus Torvalds 898f3832ed2SEric Dumazet ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type); 8991da177e4SLinus Torvalds 9001da177e4SLinus Torvalds switch (type) { 9011da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 902e6f86b0fSVirgile Jarry if (!net->ipv6.sysctl.icmpv6_echo_ignore_all) 9031da177e4SLinus Torvalds icmpv6_echo_reply(skb); 9041da177e4SLinus Torvalds break; 9051da177e4SLinus Torvalds 9061da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 907e3e32170SRick Jones success = ping_rcv(skb); 9081da177e4SLinus Torvalds break; 9091da177e4SLinus Torvalds 9101da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 9111da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 9121da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 9131da177e4SLinus Torvalds destination cache will allow to solve this problem 9141da177e4SLinus Torvalds --ANK (980726) 9151da177e4SLinus Torvalds */ 9161da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 9171da177e4SLinus Torvalds goto discard_it; 918cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 9191da177e4SLinus Torvalds 920275757e6SGustavo A. R. Silva /* to notify */ 921a8eceea8SJoe Perches fallthrough; 9221da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 9231da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 9241da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 9251da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 9261da177e4SLinus Torvalds break; 9271da177e4SLinus Torvalds 9281da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 9291da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 9301da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 9311da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 9321da177e4SLinus Torvalds case NDISC_REDIRECT: 9331da177e4SLinus Torvalds ndisc_rcv(skb); 9341da177e4SLinus Torvalds break; 9351da177e4SLinus Torvalds 9361da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 9371da177e4SLinus Torvalds igmp6_event_query(skb); 9381da177e4SLinus Torvalds break; 9391da177e4SLinus Torvalds 9401da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 9411da177e4SLinus Torvalds igmp6_event_report(skb); 9421da177e4SLinus Torvalds break; 9431da177e4SLinus Torvalds 9441da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 9451da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 9461da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 9471da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 9481da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 9491da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 9501da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 9511da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 9521da177e4SLinus Torvalds break; 9531da177e4SLinus Torvalds 9541da177e4SLinus Torvalds default: 9551da177e4SLinus Torvalds /* informational */ 9561da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 9571da177e4SLinus Torvalds break; 9581da177e4SLinus Torvalds 9594b3418fbSBjørn Mork net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n", 9604b3418fbSBjørn Mork saddr, daddr); 961ea85a0a2SDavid S. Miller 9621da177e4SLinus Torvalds /* 9631da177e4SLinus Torvalds * error of unknown type. 9641da177e4SLinus Torvalds * must pass to upper level 9651da177e4SLinus Torvalds */ 9661da177e4SLinus Torvalds 9671da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 9683ff50b79SStephen Hemminger } 9693ff50b79SStephen Hemminger 970e3e32170SRick Jones /* until the v6 path can be better sorted assume failure and 971e3e32170SRick Jones * preserve the status quo behaviour for the rest of the paths to here 972e3e32170SRick Jones */ 973e3e32170SRick Jones if (success) 974e3e32170SRick Jones consume_skb(skb); 975e3e32170SRick Jones else 9761da177e4SLinus Torvalds kfree_skb(skb); 977e3e32170SRick Jones 9781da177e4SLinus Torvalds return 0; 9791da177e4SLinus Torvalds 9806a5dc9e5SEric Dumazet csum_error: 981a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); 9821da177e4SLinus Torvalds discard_it: 983a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS); 9848b7817f3SHerbert Xu drop_no_count: 9851da177e4SLinus Torvalds kfree_skb(skb); 9861da177e4SLinus Torvalds return 0; 9871da177e4SLinus Torvalds } 9881da177e4SLinus Torvalds 9894c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, 99095e41e93SYOSHIFUJI Hideaki u8 type, 99195e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 99295e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 99395e41e93SYOSHIFUJI Hideaki int oif) 99495e41e93SYOSHIFUJI Hideaki { 9954c9483b2SDavid S. Miller memset(fl6, 0, sizeof(*fl6)); 9964e3fd7a0SAlexey Dobriyan fl6->saddr = *saddr; 9974e3fd7a0SAlexey Dobriyan fl6->daddr = *daddr; 9984c9483b2SDavid S. Miller fl6->flowi6_proto = IPPROTO_ICMPV6; 9991958b856SDavid S. Miller fl6->fl6_icmp_type = type; 10001958b856SDavid S. Miller fl6->fl6_icmp_code = 0; 10014c9483b2SDavid S. Miller fl6->flowi6_oif = oif; 10024c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); 100395e41e93SYOSHIFUJI Hideaki } 100495e41e93SYOSHIFUJI Hideaki 10053232a1efSKefeng Wang static void __net_exit icmpv6_sk_exit(struct net *net) 10063232a1efSKefeng Wang { 10073232a1efSKefeng Wang int i; 10083232a1efSKefeng Wang 10093232a1efSKefeng Wang for_each_possible_cpu(i) 101075efc250SKefeng Wang inet_ctl_sock_destroy(*per_cpu_ptr(net->ipv6.icmp_sk, i)); 101175efc250SKefeng Wang free_percpu(net->ipv6.icmp_sk); 10123232a1efSKefeng Wang } 10133232a1efSKefeng Wang 101498c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 10151da177e4SLinus Torvalds { 10161da177e4SLinus Torvalds struct sock *sk; 10173232a1efSKefeng Wang int err, i; 10181da177e4SLinus Torvalds 101975efc250SKefeng Wang net->ipv6.icmp_sk = alloc_percpu(struct sock *); 102063159f29SIan Morris if (!net->ipv6.icmp_sk) 102179c91159SDenis V. Lunev return -ENOMEM; 102279c91159SDenis V. Lunev 10236f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 10241ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 10251ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 10261da177e4SLinus Torvalds if (err < 0) { 1027f3213831SJoe Perches pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", 10281da177e4SLinus Torvalds err); 10291da177e4SLinus Torvalds goto fail; 10301da177e4SLinus Torvalds } 10311da177e4SLinus Torvalds 103275efc250SKefeng Wang *per_cpu_ptr(net->ipv6.icmp_sk, i) = sk; 10335c8cafd6SDenis V. Lunev 10341da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 10351da177e4SLinus Torvalds * sk_buff struct overhead. 10361da177e4SLinus Torvalds */ 103787fb4b7bSEric Dumazet sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); 10381da177e4SLinus Torvalds } 10391da177e4SLinus Torvalds return 0; 10401da177e4SLinus Torvalds 10411da177e4SLinus Torvalds fail: 10423232a1efSKefeng Wang icmpv6_sk_exit(net); 10431da177e4SLinus Torvalds return err; 10441da177e4SLinus Torvalds } 10451da177e4SLinus Torvalds 10468ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 104798c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 104898c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 104998c6d1b2SDenis V. Lunev }; 105098c6d1b2SDenis V. Lunev 105198c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 105298c6d1b2SDenis V. Lunev { 105398c6d1b2SDenis V. Lunev int err; 105498c6d1b2SDenis V. Lunev 105598c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 105698c6d1b2SDenis V. Lunev if (err < 0) 105798c6d1b2SDenis V. Lunev return err; 105898c6d1b2SDenis V. Lunev 105998c6d1b2SDenis V. Lunev err = -EAGAIN; 106098c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 106198c6d1b2SDenis V. Lunev goto fail; 10625f5624cfSPravin B Shelar 10635f5624cfSPravin B Shelar err = inet6_register_icmp_sender(icmp6_send); 10645f5624cfSPravin B Shelar if (err) 10655f5624cfSPravin B Shelar goto sender_reg_err; 106698c6d1b2SDenis V. Lunev return 0; 106798c6d1b2SDenis V. Lunev 10685f5624cfSPravin B Shelar sender_reg_err: 10695f5624cfSPravin B Shelar inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 107098c6d1b2SDenis V. Lunev fail: 1071f3213831SJoe Perches pr_err("Failed to register ICMP6 protocol\n"); 107298c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 107398c6d1b2SDenis V. Lunev return err; 107498c6d1b2SDenis V. Lunev } 107598c6d1b2SDenis V. Lunev 10768ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 107798c6d1b2SDenis V. Lunev { 10785f5624cfSPravin B Shelar inet6_unregister_icmp_sender(icmp6_send); 107998c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 10801da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 10811da177e4SLinus Torvalds } 10821da177e4SLinus Torvalds 108398c6d1b2SDenis V. Lunev 10849b5b5cffSArjan van de Ven static const struct icmp6_err { 10851da177e4SLinus Torvalds int err; 10861da177e4SLinus Torvalds int fatal; 10871da177e4SLinus Torvalds } tab_unreach[] = { 10881da177e4SLinus Torvalds { /* NOROUTE */ 10891da177e4SLinus Torvalds .err = ENETUNREACH, 10901da177e4SLinus Torvalds .fatal = 0, 10911da177e4SLinus Torvalds }, 10921da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 10931da177e4SLinus Torvalds .err = EACCES, 10941da177e4SLinus Torvalds .fatal = 1, 10951da177e4SLinus Torvalds }, 10961da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 10971da177e4SLinus Torvalds .err = EHOSTUNREACH, 10981da177e4SLinus Torvalds .fatal = 0, 10991da177e4SLinus Torvalds }, 11001da177e4SLinus Torvalds { /* ADDR_UNREACH */ 11011da177e4SLinus Torvalds .err = EHOSTUNREACH, 11021da177e4SLinus Torvalds .fatal = 0, 11031da177e4SLinus Torvalds }, 11041da177e4SLinus Torvalds { /* PORT_UNREACH */ 11051da177e4SLinus Torvalds .err = ECONNREFUSED, 11061da177e4SLinus Torvalds .fatal = 1, 11071da177e4SLinus Torvalds }, 110861e76b17SJiri Bohac { /* POLICY_FAIL */ 110961e76b17SJiri Bohac .err = EACCES, 111061e76b17SJiri Bohac .fatal = 1, 111161e76b17SJiri Bohac }, 111261e76b17SJiri Bohac { /* REJECT_ROUTE */ 111361e76b17SJiri Bohac .err = EACCES, 111461e76b17SJiri Bohac .fatal = 1, 111561e76b17SJiri Bohac }, 11161da177e4SLinus Torvalds }; 11171da177e4SLinus Torvalds 1118d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 11191da177e4SLinus Torvalds { 11201da177e4SLinus Torvalds int fatal = 0; 11211da177e4SLinus Torvalds 11221da177e4SLinus Torvalds *err = EPROTO; 11231da177e4SLinus Torvalds 11241da177e4SLinus Torvalds switch (type) { 11251da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 11261da177e4SLinus Torvalds fatal = 1; 112761e76b17SJiri Bohac if (code < ARRAY_SIZE(tab_unreach)) { 11281da177e4SLinus Torvalds *err = tab_unreach[code].err; 11291da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 11301da177e4SLinus Torvalds } 11311da177e4SLinus Torvalds break; 11321da177e4SLinus Torvalds 11331da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 11341da177e4SLinus Torvalds *err = EMSGSIZE; 11351da177e4SLinus Torvalds break; 11361da177e4SLinus Torvalds 11371da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 11381da177e4SLinus Torvalds *err = EPROTO; 11391da177e4SLinus Torvalds fatal = 1; 11401da177e4SLinus Torvalds break; 11411da177e4SLinus Torvalds 11421da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 11431da177e4SLinus Torvalds *err = EHOSTUNREACH; 11441da177e4SLinus Torvalds break; 11453ff50b79SStephen Hemminger } 11461da177e4SLinus Torvalds 11471da177e4SLinus Torvalds return fatal; 11481da177e4SLinus Torvalds } 11497159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 11507159039aSYOSHIFUJI Hideaki 11511da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 1152e8243534Sstephen hemminger static struct ctl_table ipv6_icmp_table_template[] = { 11531da177e4SLinus Torvalds { 11541da177e4SLinus Torvalds .procname = "ratelimit", 115541a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 11561da177e4SLinus Torvalds .maxlen = sizeof(int), 11571da177e4SLinus Torvalds .mode = 0644, 11586d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 11591da177e4SLinus Torvalds }, 1160e6f86b0fSVirgile Jarry { 1161e6f86b0fSVirgile Jarry .procname = "echo_ignore_all", 1162e6f86b0fSVirgile Jarry .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_all, 1163e6f86b0fSVirgile Jarry .maxlen = sizeof(int), 1164e6f86b0fSVirgile Jarry .mode = 0644, 1165e6f86b0fSVirgile Jarry .proc_handler = proc_dointvec, 1166e6f86b0fSVirgile Jarry }, 116703f1ecccSStephen Suryaputra { 116803f1ecccSStephen Suryaputra .procname = "echo_ignore_multicast", 116903f1ecccSStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_multicast, 117003f1ecccSStephen Suryaputra .maxlen = sizeof(int), 117103f1ecccSStephen Suryaputra .mode = 0644, 117203f1ecccSStephen Suryaputra .proc_handler = proc_dointvec, 117303f1ecccSStephen Suryaputra }, 11740b03a5caSStephen Suryaputra { 11750b03a5caSStephen Suryaputra .procname = "echo_ignore_anycast", 11760b03a5caSStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_anycast, 11770b03a5caSStephen Suryaputra .maxlen = sizeof(int), 11780b03a5caSStephen Suryaputra .mode = 0644, 11790b03a5caSStephen Suryaputra .proc_handler = proc_dointvec, 11800b03a5caSStephen Suryaputra }, 11810bc19985SStephen Suryaputra { 11820bc19985SStephen Suryaputra .procname = "ratemask", 11830bc19985SStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_ratemask_ptr, 11840bc19985SStephen Suryaputra .maxlen = ICMPV6_MSG_MAX + 1, 11850bc19985SStephen Suryaputra .mode = 0644, 11860bc19985SStephen Suryaputra .proc_handler = proc_do_large_bitmap, 11870bc19985SStephen Suryaputra }, 1188f8572d8fSEric W. Biederman { }, 11891da177e4SLinus Torvalds }; 1190760f2d01SDaniel Lezcano 11912c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 1192760f2d01SDaniel Lezcano { 1193760f2d01SDaniel Lezcano struct ctl_table *table; 1194760f2d01SDaniel Lezcano 1195760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 1196760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 1197760f2d01SDaniel Lezcano GFP_KERNEL); 11985ee09105SYOSHIFUJI Hideaki 1199e6f86b0fSVirgile Jarry if (table) { 12005ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 1201e6f86b0fSVirgile Jarry table[1].data = &net->ipv6.sysctl.icmpv6_echo_ignore_all; 120203f1ecccSStephen Suryaputra table[2].data = &net->ipv6.sysctl.icmpv6_echo_ignore_multicast; 12030b03a5caSStephen Suryaputra table[3].data = &net->ipv6.sysctl.icmpv6_echo_ignore_anycast; 12040bc19985SStephen Suryaputra table[4].data = &net->ipv6.sysctl.icmpv6_ratemask_ptr; 1205e6f86b0fSVirgile Jarry } 1206760f2d01SDaniel Lezcano return table; 1207760f2d01SDaniel Lezcano } 12081da177e4SLinus Torvalds #endif 1209