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 { 504272928d1SMathieu Desnoyers /* 505272928d1SMathieu Desnoyers * The source device is used for looking up which routing table 506272928d1SMathieu Desnoyers * to use for sending an ICMP error. 507272928d1SMathieu Desnoyers */ 508272928d1SMathieu Desnoyers iif = l3mdev_master_ifindex(skb->dev); 50979dc7e3fSDavid Ahern } 5101da177e4SLinus Torvalds 5111da177e4SLinus Torvalds /* 5128de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 5138de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 5148de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 5158de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 5161da177e4SLinus Torvalds */ 5171da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 5184b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n", 5194b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5201da177e4SLinus Torvalds return; 5211da177e4SLinus Torvalds } 5221da177e4SLinus Torvalds 5231da177e4SLinus Torvalds /* 5241da177e4SLinus Torvalds * Never answer to a ICMP packet. 5251da177e4SLinus Torvalds */ 5261da177e4SLinus Torvalds if (is_ineligible(skb)) { 5274b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n", 5284b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5291da177e4SLinus Torvalds return; 5301da177e4SLinus Torvalds } 5311da177e4SLinus Torvalds 5327ba91ecbSJesper Dangaard Brouer /* Needed by both icmp_global_allow and icmpv6_xmit_lock */ 5337ba91ecbSJesper Dangaard Brouer local_bh_disable(); 5347ba91ecbSJesper Dangaard Brouer 5357ba91ecbSJesper Dangaard Brouer /* Check global sysctl_icmp_msgs_per_sec ratelimit */ 5360bc19985SStephen Suryaputra if (!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, type)) 5377ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 5387ba91ecbSJesper Dangaard Brouer 53979383236SMasahide NAKAMURA mip6_addr_swap(skb); 54079383236SMasahide NAKAMURA 541fac6fce9SFrancesco Ruggeri sk = icmpv6_xmit_lock(net); 542fac6fce9SFrancesco Ruggeri if (!sk) 543fac6fce9SFrancesco Ruggeri goto out_bh_enable; 544fac6fce9SFrancesco Ruggeri 5454c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 5464c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 5474e3fd7a0SAlexey Dobriyan fl6.daddr = hdr->saddr; 548b1cadc1aSEric Dumazet if (force_saddr) 549b1cadc1aSEric Dumazet saddr = force_saddr; 550fac6fce9SFrancesco Ruggeri if (saddr) { 5514e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 552b93cfb9cSTim Stallard } else if (!icmpv6_rt_has_prefsrc(sk, type, &fl6)) { 553fac6fce9SFrancesco Ruggeri /* select a more meaningful saddr from input if */ 554fac6fce9SFrancesco Ruggeri struct net_device *in_netdev; 555fac6fce9SFrancesco Ruggeri 556fac6fce9SFrancesco Ruggeri in_netdev = dev_get_by_index(net, IP6CB(skb)->iif); 557fac6fce9SFrancesco Ruggeri if (in_netdev) { 558fac6fce9SFrancesco Ruggeri ipv6_dev_get_saddr(net, in_netdev, &fl6.daddr, 559fac6fce9SFrancesco Ruggeri inet6_sk(sk)->srcprefs, 560fac6fce9SFrancesco Ruggeri &fl6.saddr); 561fac6fce9SFrancesco Ruggeri dev_put(in_netdev); 562fac6fce9SFrancesco Ruggeri } 563fac6fce9SFrancesco Ruggeri } 564e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 5654c9483b2SDavid S. Miller fl6.flowi6_oif = iif; 5661958b856SDavid S. Miller fl6.fl6_icmp_type = type; 5671958b856SDavid S. Miller fl6.fl6_icmp_code = code; 568e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 569b4bac172SDavid Ahern fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, NULL); 570*3df98d79SPaul Moore security_skb_classify_flow(skb, flowi6_to_flowi_common(&fl6)); 5711da177e4SLinus Torvalds 572fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 573405666dbSDenis V. Lunev 5744c9483b2SDavid S. Miller if (!icmpv6_xrlim_allow(sk, type, &fl6)) 5751da177e4SLinus Torvalds goto out; 5761da177e4SLinus Torvalds 5771da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 5781da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 5791da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 5801da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 5811da177e4SLinus Torvalds 5824c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 5834c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 584c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 585c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 5861da177e4SLinus Torvalds 587b515430aSWillem de Bruijn ipcm6_init_sk(&ipc6, np); 5880da7536fSWillem de Bruijn ipc6.sockc.mark = mark; 58938b7097bSHannes Frederic Sowa fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 59038b7097bSHannes Frederic Sowa 5914c9483b2SDavid S. Miller dst = icmpv6_route_lookup(net, skb, sk, &fl6); 592b42835dbSDavid S. Miller if (IS_ERR(dst)) 5931da177e4SLinus Torvalds goto out; 5948de3351eSYOSHIFUJI Hideaki 59526879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 5961da177e4SLinus Torvalds 5971da177e4SLinus Torvalds msg.skb = skb; 598bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 599763ecff1SYasuyuki Kozakai msg.type = type; 6001da177e4SLinus Torvalds 6011da177e4SLinus Torvalds len = skb->len - msg.offset; 6021da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); 6031da177e4SLinus Torvalds if (len < 0) { 6044b3418fbSBjørn Mork net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n", 6054b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 6061da177e4SLinus Torvalds goto out_dst_release; 6071da177e4SLinus Torvalds } 6081da177e4SLinus Torvalds 609cfdf7647SEric Dumazet rcu_read_lock(); 610cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 6111da177e4SLinus Torvalds 6124e64b1edSJoe Perches if (ip6_append_data(sk, icmpv6_getfrag, &msg, 6131da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 61426879da5SWei Wang sizeof(struct icmp6hdr), 61526879da5SWei Wang &ipc6, &fl6, (struct rt6_info *)dst, 6165fdaa88dSWillem de Bruijn MSG_DONTWAIT)) { 61743a43b60SHannes Frederic Sowa ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 6181da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 619cfdf7647SEric Dumazet } else { 6204e64b1edSJoe Perches icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 621cfdf7647SEric Dumazet len + sizeof(struct icmp6hdr)); 6221da177e4SLinus Torvalds } 623cfdf7647SEric Dumazet rcu_read_unlock(); 6241da177e4SLinus Torvalds out_dst_release: 6251da177e4SLinus Torvalds dst_release(dst); 6261da177e4SLinus Torvalds out: 627405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 6287ba91ecbSJesper Dangaard Brouer out_bh_enable: 6297ba91ecbSJesper Dangaard Brouer local_bh_enable(); 6301da177e4SLinus Torvalds } 631cc7a21b6SEric Dumazet EXPORT_SYMBOL(icmp6_send); 6325f5624cfSPravin B Shelar 6335f5624cfSPravin B Shelar /* Slightly more convenient version of icmp6_send. 6345f5624cfSPravin B Shelar */ 6355f5624cfSPravin B Shelar void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) 6365f5624cfSPravin B Shelar { 637b1cadc1aSEric Dumazet icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL); 6385f5624cfSPravin B Shelar kfree_skb(skb); 6395f5624cfSPravin B Shelar } 6407159039aSYOSHIFUJI Hideaki 6415fbba8acSEric Dumazet /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH 6425fbba8acSEric Dumazet * if sufficient data bytes are available 6435fbba8acSEric Dumazet * @nhs is the size of the tunnel header(s) : 6445fbba8acSEric Dumazet * Either an IPv4 header for SIT encap 6455fbba8acSEric Dumazet * an IPv4 header + GRE header for GRE encap 6465fbba8acSEric Dumazet */ 64720e1954fSEric Dumazet int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type, 64820e1954fSEric Dumazet unsigned int data_len) 6495fbba8acSEric Dumazet { 6502d7a3b27SEric Dumazet struct in6_addr temp_saddr; 6515fbba8acSEric Dumazet struct rt6_info *rt; 6525fbba8acSEric Dumazet struct sk_buff *skb2; 65320e1954fSEric Dumazet u32 info = 0; 6545fbba8acSEric Dumazet 6555fbba8acSEric Dumazet if (!pskb_may_pull(skb, nhs + sizeof(struct ipv6hdr) + 8)) 6565fbba8acSEric Dumazet return 1; 6575fbba8acSEric Dumazet 65820e1954fSEric Dumazet /* RFC 4884 (partial) support for ICMP extensions */ 65920e1954fSEric Dumazet if (data_len < 128 || (data_len & 7) || skb->len < data_len) 66020e1954fSEric Dumazet data_len = 0; 66120e1954fSEric Dumazet 66220e1954fSEric Dumazet skb2 = data_len ? skb_copy(skb, GFP_ATOMIC) : skb_clone(skb, GFP_ATOMIC); 6635fbba8acSEric Dumazet 6645fbba8acSEric Dumazet if (!skb2) 6655fbba8acSEric Dumazet return 1; 6665fbba8acSEric Dumazet 6675fbba8acSEric Dumazet skb_dst_drop(skb2); 6685fbba8acSEric Dumazet skb_pull(skb2, nhs); 6695fbba8acSEric Dumazet skb_reset_network_header(skb2); 6705fbba8acSEric Dumazet 671b75cc8f9SDavid Ahern rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 672b75cc8f9SDavid Ahern skb, 0); 6735fbba8acSEric Dumazet 6745fbba8acSEric Dumazet if (rt && rt->dst.dev) 6755fbba8acSEric Dumazet skb2->dev = rt->dst.dev; 6765fbba8acSEric Dumazet 6772d7a3b27SEric Dumazet ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr); 67820e1954fSEric Dumazet 67920e1954fSEric Dumazet if (data_len) { 68020e1954fSEric Dumazet /* RFC 4884 (partial) support : 68120e1954fSEric Dumazet * insert 0 padding at the end, before the extensions 68220e1954fSEric Dumazet */ 68320e1954fSEric Dumazet __skb_push(skb2, nhs); 68420e1954fSEric Dumazet skb_reset_network_header(skb2); 68520e1954fSEric Dumazet memmove(skb2->data, skb2->data + nhs, data_len - nhs); 68620e1954fSEric Dumazet memset(skb2->data + data_len - nhs, 0, nhs); 68720e1954fSEric Dumazet /* RFC 4884 4.5 : Length is measured in 64-bit words, 68820e1954fSEric Dumazet * and stored in reserved[0] 68920e1954fSEric Dumazet */ 69020e1954fSEric Dumazet info = (data_len/8) << 24; 69120e1954fSEric Dumazet } 6922d7a3b27SEric Dumazet if (type == ICMP_TIME_EXCEEDED) 6932d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 69420e1954fSEric Dumazet info, &temp_saddr); 6952d7a3b27SEric Dumazet else 6962d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 69720e1954fSEric Dumazet info, &temp_saddr); 6985fbba8acSEric Dumazet if (rt) 6995fbba8acSEric Dumazet ip6_rt_put(rt); 7005fbba8acSEric Dumazet 7015fbba8acSEric Dumazet kfree_skb(skb2); 7025fbba8acSEric Dumazet 7035fbba8acSEric Dumazet return 0; 7045fbba8acSEric Dumazet } 7055fbba8acSEric Dumazet EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach); 7065fbba8acSEric Dumazet 7071da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 7081da177e4SLinus Torvalds { 709c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 71084427d53SYOSHIFUJI Hideaki struct sock *sk; 7111da177e4SLinus Torvalds struct inet6_dev *idev; 71284427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 713b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 714cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 7151da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 7164c9483b2SDavid S. Miller struct flowi6 fl6; 7171da177e4SLinus Torvalds struct icmpv6_msg msg; 7181da177e4SLinus Torvalds struct dst_entry *dst; 71926879da5SWei Wang struct ipcm6_cookie ipc6; 720e110861fSLorenzo Colitti u32 mark = IP6_REPLY_MARK(net, skb->mark); 7210b03a5caSStephen Suryaputra bool acast; 7221da177e4SLinus Torvalds 72303f1ecccSStephen Suryaputra if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) && 72403f1ecccSStephen Suryaputra net->ipv6.sysctl.icmpv6_echo_ignore_multicast) 72503f1ecccSStephen Suryaputra return; 72603f1ecccSStephen Suryaputra 7270660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 7281da177e4SLinus Torvalds 7290b03a5caSStephen Suryaputra acast = ipv6_anycast_destination(skb_dst(skb), saddr); 7300b03a5caSStephen Suryaputra if (acast && net->ipv6.sysctl.icmpv6_echo_ignore_anycast) 7310b03a5caSStephen Suryaputra return; 7320b03a5caSStephen Suryaputra 733509aba3bSFX Le Bail if (!ipv6_unicast_destination(skb) && 7340b03a5caSStephen Suryaputra !(net->ipv6.sysctl.anycast_src_echo_reply && acast)) 7351da177e4SLinus Torvalds saddr = NULL; 7361da177e4SLinus Torvalds 7371da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 7381da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 7391da177e4SLinus Torvalds 7404c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 741a346abe0SEric Dumazet if (net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES) 742a346abe0SEric Dumazet fl6.flowlabel = ip6_flowlabel(ipv6_hdr(skb)); 743a346abe0SEric Dumazet 7444c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 7454e3fd7a0SAlexey Dobriyan fl6.daddr = ipv6_hdr(skb)->saddr; 7461da177e4SLinus Torvalds if (saddr) 7474e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 7481b70d792SDavid Ahern fl6.flowi6_oif = icmp6_iif(skb); 7491958b856SDavid S. Miller fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; 750e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 751e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 752*3df98d79SPaul Moore security_skb_classify_flow(skb, flowi6_to_flowi_common(&fl6)); 7531da177e4SLinus Torvalds 7547ba91ecbSJesper Dangaard Brouer local_bh_disable(); 755fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 75663159f29SIan Morris if (!sk) 7577ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 758fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 759405666dbSDenis V. Lunev 7604c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 7614c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 762c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 763c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 7641da177e4SLinus Torvalds 7654e64b1edSJoe Perches if (ip6_dst_lookup(net, sk, &dst, &fl6)) 7661da177e4SLinus Torvalds goto out; 7674c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); 768452edd59SDavid S. Miller if (IS_ERR(dst)) 769e104411bSPatrick McHardy goto out; 7701da177e4SLinus Torvalds 7710bc19985SStephen Suryaputra /* Check the ratelimit */ 7720bc19985SStephen Suryaputra if ((!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, ICMPV6_ECHO_REPLY)) || 7730bc19985SStephen Suryaputra !icmpv6_xrlim_allow(sk, ICMPV6_ECHO_REPLY, &fl6)) 7740bc19985SStephen Suryaputra goto out_dst_release; 7750bc19985SStephen Suryaputra 776cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 7771da177e4SLinus Torvalds 7781da177e4SLinus Torvalds msg.skb = skb; 7791da177e4SLinus Torvalds msg.offset = 0; 780763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 7811da177e4SLinus Torvalds 782b515430aSWillem de Bruijn ipcm6_init_sk(&ipc6, np); 78326879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 78426879da5SWei Wang ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 7850da7536fSWillem de Bruijn ipc6.sockc.mark = mark; 78626879da5SWei Wang 7874e64b1edSJoe Perches if (ip6_append_data(sk, icmpv6_getfrag, &msg, 7884e64b1edSJoe Perches skb->len + sizeof(struct icmp6hdr), 78926879da5SWei Wang sizeof(struct icmp6hdr), &ipc6, &fl6, 7905fdaa88dSWillem de Bruijn (struct rt6_info *)dst, MSG_DONTWAIT)) { 791a16292a0SEric Dumazet __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 7921da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 793cfdf7647SEric Dumazet } else { 7944e64b1edSJoe Perches icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 795cfdf7647SEric Dumazet skb->len + sizeof(struct icmp6hdr)); 7961da177e4SLinus Torvalds } 7970bc19985SStephen Suryaputra out_dst_release: 7981da177e4SLinus Torvalds dst_release(dst); 7991da177e4SLinus Torvalds out: 800405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 8017ba91ecbSJesper Dangaard Brouer out_bh_enable: 8027ba91ecbSJesper Dangaard Brouer local_bh_enable(); 8031da177e4SLinus Torvalds } 8041da177e4SLinus Torvalds 805b94f1c09SDavid S. Miller void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 8061da177e4SLinus Torvalds { 80741135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 8081da177e4SLinus Torvalds int inner_offset; 80975f2811cSJesse Gross __be16 frag_off; 810f9242b6bSDavid S. Miller u8 nexthdr; 8117304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 8121da177e4SLinus Torvalds 8131da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 8147304fe46SDuan Jiong goto out; 8151da177e4SLinus Torvalds 8161da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 8171da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 8181da177e4SLinus Torvalds /* now skip over extension headers */ 81975f2811cSJesse Gross inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 82075f2811cSJesse Gross &nexthdr, &frag_off); 8211da177e4SLinus Torvalds if (inner_offset < 0) 8227304fe46SDuan Jiong goto out; 8231da177e4SLinus Torvalds } else { 8241da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 8251da177e4SLinus Torvalds } 8261da177e4SLinus Torvalds 8271da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 8281da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 8297304fe46SDuan Jiong goto out; 8301da177e4SLinus Torvalds 8311da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 8321da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 8331da177e4SLinus Torvalds pmtu discovery. 8341da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 8351da177e4SLinus Torvalds --ANK (980726) 8361da177e4SLinus Torvalds */ 8371da177e4SLinus Torvalds 838f9242b6bSDavid S. Miller ipprot = rcu_dereference(inet6_protos[nexthdr]); 8391da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 8401da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 8411da177e4SLinus Torvalds 84269d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 8437304fe46SDuan Jiong return; 8447304fe46SDuan Jiong 8457304fe46SDuan Jiong out: 846a16292a0SEric Dumazet __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); 8471da177e4SLinus Torvalds } 8481da177e4SLinus Torvalds 8491da177e4SLinus Torvalds /* 8501da177e4SLinus Torvalds * Handle icmp messages 8511da177e4SLinus Torvalds */ 8521da177e4SLinus Torvalds 853e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 8541da177e4SLinus Torvalds { 855e6f86b0fSVirgile Jarry struct net *net = dev_net(skb->dev); 856e1ae5c2eSStephen Suryaputra struct net_device *dev = icmp6_dev(skb); 8571da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 858b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 8591da177e4SLinus Torvalds struct icmp6hdr *hdr; 860d5fdd6baSBrian Haley u8 type; 861e3e32170SRick Jones bool success = false; 8621da177e4SLinus Torvalds 863aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 864def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 8658b7817f3SHerbert Xu int nh; 8668b7817f3SHerbert Xu 867def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 868aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 869aebcf82cSHerbert Xu goto drop_no_count; 870aebcf82cSHerbert Xu 87181aded24SDavid S. Miller if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) 8728b7817f3SHerbert Xu goto drop_no_count; 8738b7817f3SHerbert Xu 8748b7817f3SHerbert Xu nh = skb_network_offset(skb); 8758b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 8768b7817f3SHerbert Xu 8778b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 8788b7817f3SHerbert Xu goto drop_no_count; 8798b7817f3SHerbert Xu 8808b7817f3SHerbert Xu skb_set_network_header(skb, nh); 8818b7817f3SHerbert Xu } 8828b7817f3SHerbert Xu 883a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS); 8841da177e4SLinus Torvalds 8850660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 8860660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 8871da177e4SLinus Torvalds 88839471ac8STom Herbert if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { 889ba7a46f1SJoe Perches net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", 8900c6ce78aSHarvey Harrison saddr, daddr); 8916a5dc9e5SEric Dumazet goto csum_error; 8921da177e4SLinus Torvalds } 8931da177e4SLinus Torvalds 8948cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 8958cf22943SHerbert Xu goto discard_it; 8961da177e4SLinus Torvalds 897cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 8981da177e4SLinus Torvalds 8991da177e4SLinus Torvalds type = hdr->icmp6_type; 9001da177e4SLinus Torvalds 901f3832ed2SEric Dumazet ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type); 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds switch (type) { 9041da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 905e6f86b0fSVirgile Jarry if (!net->ipv6.sysctl.icmpv6_echo_ignore_all) 9061da177e4SLinus Torvalds icmpv6_echo_reply(skb); 9071da177e4SLinus Torvalds break; 9081da177e4SLinus Torvalds 9091da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 910e3e32170SRick Jones success = ping_rcv(skb); 9111da177e4SLinus Torvalds break; 9121da177e4SLinus Torvalds 9131da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 9141da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 9151da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 9161da177e4SLinus Torvalds destination cache will allow to solve this problem 9171da177e4SLinus Torvalds --ANK (980726) 9181da177e4SLinus Torvalds */ 9191da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 9201da177e4SLinus Torvalds goto discard_it; 921cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 9221da177e4SLinus Torvalds 923275757e6SGustavo A. R. Silva /* to notify */ 924a8eceea8SJoe Perches fallthrough; 9251da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 9261da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 9271da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 9281da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 9291da177e4SLinus Torvalds break; 9301da177e4SLinus Torvalds 9311da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 9321da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 9331da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 9341da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 9351da177e4SLinus Torvalds case NDISC_REDIRECT: 9361da177e4SLinus Torvalds ndisc_rcv(skb); 9371da177e4SLinus Torvalds break; 9381da177e4SLinus Torvalds 9391da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 9401da177e4SLinus Torvalds igmp6_event_query(skb); 9411da177e4SLinus Torvalds break; 9421da177e4SLinus Torvalds 9431da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 9441da177e4SLinus Torvalds igmp6_event_report(skb); 9451da177e4SLinus Torvalds break; 9461da177e4SLinus Torvalds 9471da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 9481da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 9491da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 9501da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 9511da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 9521da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 9531da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 9541da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 9551da177e4SLinus Torvalds break; 9561da177e4SLinus Torvalds 9571da177e4SLinus Torvalds default: 9581da177e4SLinus Torvalds /* informational */ 9591da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 9601da177e4SLinus Torvalds break; 9611da177e4SLinus Torvalds 9624b3418fbSBjørn Mork net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n", 9634b3418fbSBjørn Mork saddr, daddr); 964ea85a0a2SDavid S. Miller 9651da177e4SLinus Torvalds /* 9661da177e4SLinus Torvalds * error of unknown type. 9671da177e4SLinus Torvalds * must pass to upper level 9681da177e4SLinus Torvalds */ 9691da177e4SLinus Torvalds 9701da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 9713ff50b79SStephen Hemminger } 9723ff50b79SStephen Hemminger 973e3e32170SRick Jones /* until the v6 path can be better sorted assume failure and 974e3e32170SRick Jones * preserve the status quo behaviour for the rest of the paths to here 975e3e32170SRick Jones */ 976e3e32170SRick Jones if (success) 977e3e32170SRick Jones consume_skb(skb); 978e3e32170SRick Jones else 9791da177e4SLinus Torvalds kfree_skb(skb); 980e3e32170SRick Jones 9811da177e4SLinus Torvalds return 0; 9821da177e4SLinus Torvalds 9836a5dc9e5SEric Dumazet csum_error: 984a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); 9851da177e4SLinus Torvalds discard_it: 986a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS); 9878b7817f3SHerbert Xu drop_no_count: 9881da177e4SLinus Torvalds kfree_skb(skb); 9891da177e4SLinus Torvalds return 0; 9901da177e4SLinus Torvalds } 9911da177e4SLinus Torvalds 9924c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, 99395e41e93SYOSHIFUJI Hideaki u8 type, 99495e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 99595e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 99695e41e93SYOSHIFUJI Hideaki int oif) 99795e41e93SYOSHIFUJI Hideaki { 9984c9483b2SDavid S. Miller memset(fl6, 0, sizeof(*fl6)); 9994e3fd7a0SAlexey Dobriyan fl6->saddr = *saddr; 10004e3fd7a0SAlexey Dobriyan fl6->daddr = *daddr; 10014c9483b2SDavid S. Miller fl6->flowi6_proto = IPPROTO_ICMPV6; 10021958b856SDavid S. Miller fl6->fl6_icmp_type = type; 10031958b856SDavid S. Miller fl6->fl6_icmp_code = 0; 10044c9483b2SDavid S. Miller fl6->flowi6_oif = oif; 1005*3df98d79SPaul Moore security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6)); 100695e41e93SYOSHIFUJI Hideaki } 100795e41e93SYOSHIFUJI Hideaki 10083232a1efSKefeng Wang static void __net_exit icmpv6_sk_exit(struct net *net) 10093232a1efSKefeng Wang { 10103232a1efSKefeng Wang int i; 10113232a1efSKefeng Wang 10123232a1efSKefeng Wang for_each_possible_cpu(i) 101375efc250SKefeng Wang inet_ctl_sock_destroy(*per_cpu_ptr(net->ipv6.icmp_sk, i)); 101475efc250SKefeng Wang free_percpu(net->ipv6.icmp_sk); 10153232a1efSKefeng Wang } 10163232a1efSKefeng Wang 101798c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 10181da177e4SLinus Torvalds { 10191da177e4SLinus Torvalds struct sock *sk; 10203232a1efSKefeng Wang int err, i; 10211da177e4SLinus Torvalds 102275efc250SKefeng Wang net->ipv6.icmp_sk = alloc_percpu(struct sock *); 102363159f29SIan Morris if (!net->ipv6.icmp_sk) 102479c91159SDenis V. Lunev return -ENOMEM; 102579c91159SDenis V. Lunev 10266f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 10271ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 10281ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 10291da177e4SLinus Torvalds if (err < 0) { 1030f3213831SJoe Perches pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", 10311da177e4SLinus Torvalds err); 10321da177e4SLinus Torvalds goto fail; 10331da177e4SLinus Torvalds } 10341da177e4SLinus Torvalds 103575efc250SKefeng Wang *per_cpu_ptr(net->ipv6.icmp_sk, i) = sk; 10365c8cafd6SDenis V. Lunev 10371da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 10381da177e4SLinus Torvalds * sk_buff struct overhead. 10391da177e4SLinus Torvalds */ 104087fb4b7bSEric Dumazet sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); 10411da177e4SLinus Torvalds } 10421da177e4SLinus Torvalds return 0; 10431da177e4SLinus Torvalds 10441da177e4SLinus Torvalds fail: 10453232a1efSKefeng Wang icmpv6_sk_exit(net); 10461da177e4SLinus Torvalds return err; 10471da177e4SLinus Torvalds } 10481da177e4SLinus Torvalds 10498ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 105098c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 105198c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 105298c6d1b2SDenis V. Lunev }; 105398c6d1b2SDenis V. Lunev 105498c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 105598c6d1b2SDenis V. Lunev { 105698c6d1b2SDenis V. Lunev int err; 105798c6d1b2SDenis V. Lunev 105898c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 105998c6d1b2SDenis V. Lunev if (err < 0) 106098c6d1b2SDenis V. Lunev return err; 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 unregister_pernet_subsys(&icmpv6_sk_ops); 107698c6d1b2SDenis V. Lunev return err; 107798c6d1b2SDenis V. Lunev } 107898c6d1b2SDenis V. Lunev 10798ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 108098c6d1b2SDenis V. Lunev { 10815f5624cfSPravin B Shelar inet6_unregister_icmp_sender(icmp6_send); 108298c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 10831da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 10841da177e4SLinus Torvalds } 10851da177e4SLinus Torvalds 108698c6d1b2SDenis V. Lunev 10879b5b5cffSArjan van de Ven static const struct icmp6_err { 10881da177e4SLinus Torvalds int err; 10891da177e4SLinus Torvalds int fatal; 10901da177e4SLinus Torvalds } tab_unreach[] = { 10911da177e4SLinus Torvalds { /* NOROUTE */ 10921da177e4SLinus Torvalds .err = ENETUNREACH, 10931da177e4SLinus Torvalds .fatal = 0, 10941da177e4SLinus Torvalds }, 10951da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 10961da177e4SLinus Torvalds .err = EACCES, 10971da177e4SLinus Torvalds .fatal = 1, 10981da177e4SLinus Torvalds }, 10991da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 11001da177e4SLinus Torvalds .err = EHOSTUNREACH, 11011da177e4SLinus Torvalds .fatal = 0, 11021da177e4SLinus Torvalds }, 11031da177e4SLinus Torvalds { /* ADDR_UNREACH */ 11041da177e4SLinus Torvalds .err = EHOSTUNREACH, 11051da177e4SLinus Torvalds .fatal = 0, 11061da177e4SLinus Torvalds }, 11071da177e4SLinus Torvalds { /* PORT_UNREACH */ 11081da177e4SLinus Torvalds .err = ECONNREFUSED, 11091da177e4SLinus Torvalds .fatal = 1, 11101da177e4SLinus Torvalds }, 111161e76b17SJiri Bohac { /* POLICY_FAIL */ 111261e76b17SJiri Bohac .err = EACCES, 111361e76b17SJiri Bohac .fatal = 1, 111461e76b17SJiri Bohac }, 111561e76b17SJiri Bohac { /* REJECT_ROUTE */ 111661e76b17SJiri Bohac .err = EACCES, 111761e76b17SJiri Bohac .fatal = 1, 111861e76b17SJiri Bohac }, 11191da177e4SLinus Torvalds }; 11201da177e4SLinus Torvalds 1121d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 11221da177e4SLinus Torvalds { 11231da177e4SLinus Torvalds int fatal = 0; 11241da177e4SLinus Torvalds 11251da177e4SLinus Torvalds *err = EPROTO; 11261da177e4SLinus Torvalds 11271da177e4SLinus Torvalds switch (type) { 11281da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 11291da177e4SLinus Torvalds fatal = 1; 113061e76b17SJiri Bohac if (code < ARRAY_SIZE(tab_unreach)) { 11311da177e4SLinus Torvalds *err = tab_unreach[code].err; 11321da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 11331da177e4SLinus Torvalds } 11341da177e4SLinus Torvalds break; 11351da177e4SLinus Torvalds 11361da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 11371da177e4SLinus Torvalds *err = EMSGSIZE; 11381da177e4SLinus Torvalds break; 11391da177e4SLinus Torvalds 11401da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 11411da177e4SLinus Torvalds *err = EPROTO; 11421da177e4SLinus Torvalds fatal = 1; 11431da177e4SLinus Torvalds break; 11441da177e4SLinus Torvalds 11451da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 11461da177e4SLinus Torvalds *err = EHOSTUNREACH; 11471da177e4SLinus Torvalds break; 11483ff50b79SStephen Hemminger } 11491da177e4SLinus Torvalds 11501da177e4SLinus Torvalds return fatal; 11511da177e4SLinus Torvalds } 11527159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 11537159039aSYOSHIFUJI Hideaki 11541da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 1155e8243534Sstephen hemminger static struct ctl_table ipv6_icmp_table_template[] = { 11561da177e4SLinus Torvalds { 11571da177e4SLinus Torvalds .procname = "ratelimit", 115841a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 11591da177e4SLinus Torvalds .maxlen = sizeof(int), 11601da177e4SLinus Torvalds .mode = 0644, 11616d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 11621da177e4SLinus Torvalds }, 1163e6f86b0fSVirgile Jarry { 1164e6f86b0fSVirgile Jarry .procname = "echo_ignore_all", 1165e6f86b0fSVirgile Jarry .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_all, 1166e6f86b0fSVirgile Jarry .maxlen = sizeof(int), 1167e6f86b0fSVirgile Jarry .mode = 0644, 1168e6f86b0fSVirgile Jarry .proc_handler = proc_dointvec, 1169e6f86b0fSVirgile Jarry }, 117003f1ecccSStephen Suryaputra { 117103f1ecccSStephen Suryaputra .procname = "echo_ignore_multicast", 117203f1ecccSStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_multicast, 117303f1ecccSStephen Suryaputra .maxlen = sizeof(int), 117403f1ecccSStephen Suryaputra .mode = 0644, 117503f1ecccSStephen Suryaputra .proc_handler = proc_dointvec, 117603f1ecccSStephen Suryaputra }, 11770b03a5caSStephen Suryaputra { 11780b03a5caSStephen Suryaputra .procname = "echo_ignore_anycast", 11790b03a5caSStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_anycast, 11800b03a5caSStephen Suryaputra .maxlen = sizeof(int), 11810b03a5caSStephen Suryaputra .mode = 0644, 11820b03a5caSStephen Suryaputra .proc_handler = proc_dointvec, 11830b03a5caSStephen Suryaputra }, 11840bc19985SStephen Suryaputra { 11850bc19985SStephen Suryaputra .procname = "ratemask", 11860bc19985SStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_ratemask_ptr, 11870bc19985SStephen Suryaputra .maxlen = ICMPV6_MSG_MAX + 1, 11880bc19985SStephen Suryaputra .mode = 0644, 11890bc19985SStephen Suryaputra .proc_handler = proc_do_large_bitmap, 11900bc19985SStephen Suryaputra }, 1191f8572d8fSEric W. Biederman { }, 11921da177e4SLinus Torvalds }; 1193760f2d01SDaniel Lezcano 11942c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 1195760f2d01SDaniel Lezcano { 1196760f2d01SDaniel Lezcano struct ctl_table *table; 1197760f2d01SDaniel Lezcano 1198760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 1199760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 1200760f2d01SDaniel Lezcano GFP_KERNEL); 12015ee09105SYOSHIFUJI Hideaki 1202e6f86b0fSVirgile Jarry if (table) { 12035ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 1204e6f86b0fSVirgile Jarry table[1].data = &net->ipv6.sysctl.icmpv6_echo_ignore_all; 120503f1ecccSStephen Suryaputra table[2].data = &net->ipv6.sysctl.icmpv6_echo_ignore_multicast; 12060b03a5caSStephen Suryaputra table[3].data = &net->ipv6.sysctl.icmpv6_echo_ignore_anycast; 12070bc19985SStephen Suryaputra table[4].data = &net->ipv6.sysctl.icmpv6_ratemask_ptr; 1208e6f86b0fSVirgile Jarry } 1209760f2d01SDaniel Lezcano return table; 1210760f2d01SDaniel Lezcano } 12111da177e4SLinus Torvalds #endif 1212