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 2321da177e4SLinus Torvalds /* 2331da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2341da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2351da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2361da177e4SLinus Torvalds * highest-order two bits set to 10 2371da177e4SLinus Torvalds */ 2381da177e4SLinus Torvalds 239a50feda5SEric Dumazet static bool opt_unrec(struct sk_buff *skb, __u32 offset) 2401da177e4SLinus Torvalds { 2411da177e4SLinus Torvalds u8 _optval, *op; 2421da177e4SLinus Torvalds 243bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2441da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 24563159f29SIan Morris if (!op) 246a50feda5SEric Dumazet return true; 2471da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2481da177e4SLinus Torvalds } 2491da177e4SLinus Torvalds 2504e64b1edSJoe Perches void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 2516d0bfe22SLorenzo Colitti struct icmp6hdr *thdr, int len) 2521da177e4SLinus Torvalds { 2531da177e4SLinus Torvalds struct sk_buff *skb; 2541da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2551da177e4SLinus Torvalds 256e5d08d71SIan Morris skb = skb_peek(&sk->sk_write_queue); 25763159f29SIan Morris if (!skb) 2584e64b1edSJoe Perches return; 2591da177e4SLinus Torvalds 260cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2611da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2621da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 26507f0757aSJoe Perches skb->csum = csum_partial(icmp6h, 2661da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2674c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2684c9483b2SDavid S. Miller &fl6->daddr, 2694c9483b2SDavid S. Miller len, fl6->flowi6_proto, 2701da177e4SLinus Torvalds skb->csum); 2711da177e4SLinus Torvalds } else { 272868c86bcSAl Viro __wsum tmp_csum = 0; 2731da177e4SLinus Torvalds 2741da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2751da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2761da177e4SLinus Torvalds } 2771da177e4SLinus Torvalds 27807f0757aSJoe Perches tmp_csum = csum_partial(icmp6h, 2791da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 2804c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2814c9483b2SDavid S. Miller &fl6->daddr, 2824c9483b2SDavid S. Miller len, fl6->flowi6_proto, 283868c86bcSAl Viro tmp_csum); 2841da177e4SLinus Torvalds } 2851da177e4SLinus Torvalds ip6_push_pending_frames(sk); 2861da177e4SLinus Torvalds } 2871da177e4SLinus Torvalds 2881da177e4SLinus Torvalds struct icmpv6_msg { 2891da177e4SLinus Torvalds struct sk_buff *skb; 2901da177e4SLinus Torvalds int offset; 291763ecff1SYasuyuki Kozakai uint8_t type; 2921da177e4SLinus Torvalds }; 2931da177e4SLinus Torvalds 2941da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 2951da177e4SLinus Torvalds { 2961da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 2971da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 2985f92a738SAl Viro __wsum csum = 0; 2991da177e4SLinus Torvalds 3001da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 3011da177e4SLinus Torvalds to, len, csum); 3021da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 303763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 304763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 3051da177e4SLinus Torvalds return 0; 3061da177e4SLinus Torvalds } 3071da177e4SLinus Torvalds 30807a93626SAmerigo Wang #if IS_ENABLED(CONFIG_IPV6_MIP6) 30979383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 31079383236SMasahide NAKAMURA { 3110660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 31279383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 31379383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 31479383236SMasahide NAKAMURA struct in6_addr tmp; 31579383236SMasahide NAKAMURA int off; 31679383236SMasahide NAKAMURA 31779383236SMasahide NAKAMURA if (opt->dsthao) { 31879383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 31979383236SMasahide NAKAMURA if (likely(off >= 0)) { 320d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 321d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 3224e3fd7a0SAlexey Dobriyan tmp = iph->saddr; 3234e3fd7a0SAlexey Dobriyan iph->saddr = hao->addr; 3244e3fd7a0SAlexey Dobriyan hao->addr = tmp; 32579383236SMasahide NAKAMURA } 32679383236SMasahide NAKAMURA } 32779383236SMasahide NAKAMURA } 32879383236SMasahide NAKAMURA #else 32979383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 33079383236SMasahide NAKAMURA #endif 33179383236SMasahide NAKAMURA 332e8243534Sstephen hemminger static struct dst_entry *icmpv6_route_lookup(struct net *net, 333e8243534Sstephen hemminger struct sk_buff *skb, 334e8243534Sstephen hemminger struct sock *sk, 335e8243534Sstephen hemminger struct flowi6 *fl6) 336b42835dbSDavid S. Miller { 337b42835dbSDavid S. Miller struct dst_entry *dst, *dst2; 3384c9483b2SDavid S. Miller struct flowi6 fl2; 339b42835dbSDavid S. Miller int err; 340b42835dbSDavid S. Miller 341343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst, fl6); 342b42835dbSDavid S. Miller if (err) 343b42835dbSDavid S. Miller return ERR_PTR(err); 344b42835dbSDavid S. Miller 345b42835dbSDavid S. Miller /* 346b42835dbSDavid S. Miller * We won't send icmp if the destination is known 347b42835dbSDavid S. Miller * anycast. 348b42835dbSDavid S. Miller */ 3492647a9b0SMartin KaFai Lau if (ipv6_anycast_destination(dst, &fl6->daddr)) { 350ba7a46f1SJoe Perches net_dbg_ratelimited("icmp6_send: acast source\n"); 351b42835dbSDavid S. Miller dst_release(dst); 352b42835dbSDavid S. Miller return ERR_PTR(-EINVAL); 353b42835dbSDavid S. Miller } 354b42835dbSDavid S. Miller 355b42835dbSDavid S. Miller /* No need to clone since we're just using its address. */ 356b42835dbSDavid S. Miller dst2 = dst; 357b42835dbSDavid S. Miller 3584c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); 359452edd59SDavid S. Miller if (!IS_ERR(dst)) { 360b42835dbSDavid S. Miller if (dst != dst2) 361b42835dbSDavid S. Miller return dst; 362452edd59SDavid S. Miller } else { 363452edd59SDavid S. Miller if (PTR_ERR(dst) == -EPERM) 364b42835dbSDavid S. Miller dst = NULL; 365452edd59SDavid S. Miller else 366452edd59SDavid S. Miller return dst; 367b42835dbSDavid S. Miller } 368b42835dbSDavid S. Miller 3694c9483b2SDavid S. Miller err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); 370b42835dbSDavid S. Miller if (err) 371b42835dbSDavid S. Miller goto relookup_failed; 372b42835dbSDavid S. Miller 373343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst2, &fl2); 374b42835dbSDavid S. Miller if (err) 375b42835dbSDavid S. Miller goto relookup_failed; 376b42835dbSDavid S. Miller 3774c9483b2SDavid S. Miller dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); 378452edd59SDavid S. Miller if (!IS_ERR(dst2)) { 379b42835dbSDavid S. Miller dst_release(dst); 380b42835dbSDavid S. Miller dst = dst2; 381452edd59SDavid S. Miller } else { 382452edd59SDavid S. Miller err = PTR_ERR(dst2); 383452edd59SDavid S. Miller if (err == -EPERM) { 384b42835dbSDavid S. Miller dst_release(dst); 385452edd59SDavid S. Miller return dst2; 386452edd59SDavid S. Miller } else 387b42835dbSDavid S. Miller goto relookup_failed; 388b42835dbSDavid S. Miller } 389b42835dbSDavid S. Miller 390b42835dbSDavid S. Miller relookup_failed: 391b42835dbSDavid S. Miller if (dst) 392b42835dbSDavid S. Miller return dst; 393b42835dbSDavid S. Miller return ERR_PTR(err); 394b42835dbSDavid S. Miller } 395b42835dbSDavid S. Miller 396e1ae5c2eSStephen Suryaputra static struct net_device *icmp6_dev(const struct sk_buff *skb) 3971b70d792SDavid Ahern { 398e1ae5c2eSStephen Suryaputra struct net_device *dev = skb->dev; 3991b70d792SDavid Ahern 4001b70d792SDavid Ahern /* for local traffic to local address, skb dev is the loopback 4011b70d792SDavid Ahern * device. Check if there is a dst attached to the skb and if so 40224b711edSDavid Ahern * get the real device index. Same is needed for replies to a link 40324b711edSDavid Ahern * local address on a device enslaved to an L3 master device 4041b70d792SDavid Ahern */ 405e1ae5c2eSStephen Suryaputra if (unlikely(dev->ifindex == LOOPBACK_IFINDEX || netif_is_l3_master(skb->dev))) { 4061b70d792SDavid Ahern const struct rt6_info *rt6 = skb_rt6_info(skb); 4071b70d792SDavid Ahern 4081b70d792SDavid Ahern if (rt6) 409e1ae5c2eSStephen Suryaputra dev = rt6->rt6i_idev->dev; 4101b70d792SDavid Ahern } 4111b70d792SDavid Ahern 412e1ae5c2eSStephen Suryaputra return dev; 413e1ae5c2eSStephen Suryaputra } 414e1ae5c2eSStephen Suryaputra 415e1ae5c2eSStephen Suryaputra static int icmp6_iif(const struct sk_buff *skb) 416e1ae5c2eSStephen Suryaputra { 417e1ae5c2eSStephen Suryaputra return icmp6_dev(skb)->ifindex; 4181b70d792SDavid Ahern } 4191b70d792SDavid Ahern 4201da177e4SLinus Torvalds /* 4211da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 4221da177e4SLinus Torvalds */ 423b1cadc1aSEric Dumazet static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info, 424b1cadc1aSEric Dumazet const struct in6_addr *force_saddr) 4251da177e4SLinus Torvalds { 4261da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 4270660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 42884427d53SYOSHIFUJI Hideaki struct sock *sk; 4298d933670SEric Dumazet struct net *net; 43084427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 431b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 4321da177e4SLinus Torvalds struct dst_entry *dst; 4331da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 4344c9483b2SDavid S. Miller struct flowi6 fl6; 4351da177e4SLinus Torvalds struct icmpv6_msg msg; 43626879da5SWei Wang struct ipcm6_cookie ipc6; 4371da177e4SLinus Torvalds int iif = 0; 4381da177e4SLinus Torvalds int addr_type = 0; 4391da177e4SLinus Torvalds int len; 4408d933670SEric Dumazet u32 mark; 4411da177e4SLinus Torvalds 44227a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 44329a3cad5SSimon Horman (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb)) 4441da177e4SLinus Torvalds return; 4451da177e4SLinus Torvalds 4468d933670SEric Dumazet if (!skb->dev) 4478d933670SEric Dumazet return; 4488d933670SEric Dumazet net = dev_net(skb->dev); 4498d933670SEric Dumazet mark = IP6_REPLY_MARK(net, skb->mark); 4501da177e4SLinus Torvalds /* 4511da177e4SLinus Torvalds * Make sure we respect the rules 4521da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 4535f5624cfSPravin B Shelar * Rule (e.1) is enforced by not using icmp6_send 4541da177e4SLinus Torvalds * in any code that processes icmp errors. 4551da177e4SLinus Torvalds */ 4561da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 4571da177e4SLinus Torvalds 458446fab59SFX Le Bail if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) || 459d94c1f92SFX Le Bail ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr)) 4601da177e4SLinus Torvalds saddr = &hdr->daddr; 4611da177e4SLinus Torvalds 4621da177e4SLinus Torvalds /* 4631da177e4SLinus Torvalds * Dest addr check 4641da177e4SLinus Torvalds */ 4651da177e4SLinus Torvalds 4669a6b4b39Szhuyj if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) { 4671da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 4681da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 4691da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 4701da177e4SLinus Torvalds (opt_unrec(skb, info)))) 4711da177e4SLinus Torvalds return; 4721da177e4SLinus Torvalds 4731da177e4SLinus Torvalds saddr = NULL; 4741da177e4SLinus Torvalds } 4751da177e4SLinus Torvalds 4761da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 4771da177e4SLinus Torvalds 4781da177e4SLinus Torvalds /* 4791da177e4SLinus Torvalds * Source addr check 4801da177e4SLinus Torvalds */ 4811da177e4SLinus Torvalds 4824832c30dSDavid Ahern if (__ipv6_addr_needs_scope_id(addr_type)) { 4831b70d792SDavid Ahern iif = icmp6_iif(skb); 4844832c30dSDavid Ahern } else { 48579dc7e3fSDavid Ahern dst = skb_dst(skb); 48679dc7e3fSDavid Ahern iif = l3mdev_master_ifindex(dst ? dst->dev : skb->dev); 48779dc7e3fSDavid Ahern } 4881da177e4SLinus Torvalds 4891da177e4SLinus Torvalds /* 4908de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 4918de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 4928de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 4938de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 4941da177e4SLinus Torvalds */ 4951da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 4964b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n", 4974b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 4981da177e4SLinus Torvalds return; 4991da177e4SLinus Torvalds } 5001da177e4SLinus Torvalds 5011da177e4SLinus Torvalds /* 5021da177e4SLinus Torvalds * Never answer to a ICMP packet. 5031da177e4SLinus Torvalds */ 5041da177e4SLinus Torvalds if (is_ineligible(skb)) { 5054b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n", 5064b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5071da177e4SLinus Torvalds return; 5081da177e4SLinus Torvalds } 5091da177e4SLinus Torvalds 5107ba91ecbSJesper Dangaard Brouer /* Needed by both icmp_global_allow and icmpv6_xmit_lock */ 5117ba91ecbSJesper Dangaard Brouer local_bh_disable(); 5127ba91ecbSJesper Dangaard Brouer 5137ba91ecbSJesper Dangaard Brouer /* Check global sysctl_icmp_msgs_per_sec ratelimit */ 5140bc19985SStephen Suryaputra if (!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, type)) 5157ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 5167ba91ecbSJesper Dangaard Brouer 51779383236SMasahide NAKAMURA mip6_addr_swap(skb); 51879383236SMasahide NAKAMURA 5194c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 5204c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 5214e3fd7a0SAlexey Dobriyan fl6.daddr = hdr->saddr; 522b1cadc1aSEric Dumazet if (force_saddr) 523b1cadc1aSEric Dumazet saddr = force_saddr; 5241da177e4SLinus Torvalds if (saddr) 5254e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 526e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 5274c9483b2SDavid S. Miller fl6.flowi6_oif = iif; 5281958b856SDavid S. Miller fl6.fl6_icmp_type = type; 5291958b856SDavid S. Miller fl6.fl6_icmp_code = code; 530e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 531b4bac172SDavid Ahern fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, NULL); 5324c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 5331da177e4SLinus Torvalds 534fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 53563159f29SIan Morris if (!sk) 5367ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 537c0303efeSJesper Dangaard Brouer 538e110861fSLorenzo Colitti sk->sk_mark = mark; 539fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 540405666dbSDenis V. Lunev 5414c9483b2SDavid S. Miller if (!icmpv6_xrlim_allow(sk, type, &fl6)) 5421da177e4SLinus Torvalds goto out; 5431da177e4SLinus Torvalds 5441da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 5451da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 5461da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 5471da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 5481da177e4SLinus Torvalds 5494c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 5504c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 551c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 552c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 5531da177e4SLinus Torvalds 554b515430aSWillem de Bruijn ipcm6_init_sk(&ipc6, np); 55538b7097bSHannes Frederic Sowa fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 55638b7097bSHannes Frederic Sowa 5574c9483b2SDavid S. Miller dst = icmpv6_route_lookup(net, skb, sk, &fl6); 558b42835dbSDavid S. Miller if (IS_ERR(dst)) 5591da177e4SLinus Torvalds goto out; 5608de3351eSYOSHIFUJI Hideaki 56126879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 5621da177e4SLinus Torvalds 5631da177e4SLinus Torvalds msg.skb = skb; 564bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 565763ecff1SYasuyuki Kozakai msg.type = type; 5661da177e4SLinus Torvalds 5671da177e4SLinus Torvalds len = skb->len - msg.offset; 5681da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); 5691da177e4SLinus Torvalds if (len < 0) { 5704b3418fbSBjørn Mork net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n", 5714b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5721da177e4SLinus Torvalds goto out_dst_release; 5731da177e4SLinus Torvalds } 5741da177e4SLinus Torvalds 575cfdf7647SEric Dumazet rcu_read_lock(); 576cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 5771da177e4SLinus Torvalds 5784e64b1edSJoe Perches if (ip6_append_data(sk, icmpv6_getfrag, &msg, 5791da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 58026879da5SWei Wang sizeof(struct icmp6hdr), 58126879da5SWei Wang &ipc6, &fl6, (struct rt6_info *)dst, 5825fdaa88dSWillem de Bruijn MSG_DONTWAIT)) { 58343a43b60SHannes Frederic Sowa ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 5841da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 585cfdf7647SEric Dumazet } else { 5864e64b1edSJoe Perches icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 587cfdf7647SEric Dumazet len + sizeof(struct icmp6hdr)); 5881da177e4SLinus Torvalds } 589cfdf7647SEric Dumazet rcu_read_unlock(); 5901da177e4SLinus Torvalds out_dst_release: 5911da177e4SLinus Torvalds dst_release(dst); 5921da177e4SLinus Torvalds out: 593405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5947ba91ecbSJesper Dangaard Brouer out_bh_enable: 5957ba91ecbSJesper Dangaard Brouer local_bh_enable(); 5961da177e4SLinus Torvalds } 5975f5624cfSPravin B Shelar 5985f5624cfSPravin B Shelar /* Slightly more convenient version of icmp6_send. 5995f5624cfSPravin B Shelar */ 6005f5624cfSPravin B Shelar void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) 6015f5624cfSPravin B Shelar { 602b1cadc1aSEric Dumazet icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL); 6035f5624cfSPravin B Shelar kfree_skb(skb); 6045f5624cfSPravin B Shelar } 6057159039aSYOSHIFUJI Hideaki 6065fbba8acSEric Dumazet /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH 6075fbba8acSEric Dumazet * if sufficient data bytes are available 6085fbba8acSEric Dumazet * @nhs is the size of the tunnel header(s) : 6095fbba8acSEric Dumazet * Either an IPv4 header for SIT encap 6105fbba8acSEric Dumazet * an IPv4 header + GRE header for GRE encap 6115fbba8acSEric Dumazet */ 61220e1954fSEric Dumazet int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type, 61320e1954fSEric Dumazet unsigned int data_len) 6145fbba8acSEric Dumazet { 6152d7a3b27SEric Dumazet struct in6_addr temp_saddr; 6165fbba8acSEric Dumazet struct rt6_info *rt; 6175fbba8acSEric Dumazet struct sk_buff *skb2; 61820e1954fSEric Dumazet u32 info = 0; 6195fbba8acSEric Dumazet 6205fbba8acSEric Dumazet if (!pskb_may_pull(skb, nhs + sizeof(struct ipv6hdr) + 8)) 6215fbba8acSEric Dumazet return 1; 6225fbba8acSEric Dumazet 62320e1954fSEric Dumazet /* RFC 4884 (partial) support for ICMP extensions */ 62420e1954fSEric Dumazet if (data_len < 128 || (data_len & 7) || skb->len < data_len) 62520e1954fSEric Dumazet data_len = 0; 62620e1954fSEric Dumazet 62720e1954fSEric Dumazet skb2 = data_len ? skb_copy(skb, GFP_ATOMIC) : skb_clone(skb, GFP_ATOMIC); 6285fbba8acSEric Dumazet 6295fbba8acSEric Dumazet if (!skb2) 6305fbba8acSEric Dumazet return 1; 6315fbba8acSEric Dumazet 6325fbba8acSEric Dumazet skb_dst_drop(skb2); 6335fbba8acSEric Dumazet skb_pull(skb2, nhs); 6345fbba8acSEric Dumazet skb_reset_network_header(skb2); 6355fbba8acSEric Dumazet 636b75cc8f9SDavid Ahern rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 637b75cc8f9SDavid Ahern skb, 0); 6385fbba8acSEric Dumazet 6395fbba8acSEric Dumazet if (rt && rt->dst.dev) 6405fbba8acSEric Dumazet skb2->dev = rt->dst.dev; 6415fbba8acSEric Dumazet 6422d7a3b27SEric Dumazet ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr); 64320e1954fSEric Dumazet 64420e1954fSEric Dumazet if (data_len) { 64520e1954fSEric Dumazet /* RFC 4884 (partial) support : 64620e1954fSEric Dumazet * insert 0 padding at the end, before the extensions 64720e1954fSEric Dumazet */ 64820e1954fSEric Dumazet __skb_push(skb2, nhs); 64920e1954fSEric Dumazet skb_reset_network_header(skb2); 65020e1954fSEric Dumazet memmove(skb2->data, skb2->data + nhs, data_len - nhs); 65120e1954fSEric Dumazet memset(skb2->data + data_len - nhs, 0, nhs); 65220e1954fSEric Dumazet /* RFC 4884 4.5 : Length is measured in 64-bit words, 65320e1954fSEric Dumazet * and stored in reserved[0] 65420e1954fSEric Dumazet */ 65520e1954fSEric Dumazet info = (data_len/8) << 24; 65620e1954fSEric Dumazet } 6572d7a3b27SEric Dumazet if (type == ICMP_TIME_EXCEEDED) 6582d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 65920e1954fSEric Dumazet info, &temp_saddr); 6602d7a3b27SEric Dumazet else 6612d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 66220e1954fSEric Dumazet info, &temp_saddr); 6635fbba8acSEric Dumazet if (rt) 6645fbba8acSEric Dumazet ip6_rt_put(rt); 6655fbba8acSEric Dumazet 6665fbba8acSEric Dumazet kfree_skb(skb2); 6675fbba8acSEric Dumazet 6685fbba8acSEric Dumazet return 0; 6695fbba8acSEric Dumazet } 6705fbba8acSEric Dumazet EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach); 6715fbba8acSEric Dumazet 6721da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 6731da177e4SLinus Torvalds { 674c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 67584427d53SYOSHIFUJI Hideaki struct sock *sk; 6761da177e4SLinus Torvalds struct inet6_dev *idev; 67784427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 678b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 679cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 6801da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 6814c9483b2SDavid S. Miller struct flowi6 fl6; 6821da177e4SLinus Torvalds struct icmpv6_msg msg; 6831da177e4SLinus Torvalds struct dst_entry *dst; 68426879da5SWei Wang struct ipcm6_cookie ipc6; 685e110861fSLorenzo Colitti u32 mark = IP6_REPLY_MARK(net, skb->mark); 6860b03a5caSStephen Suryaputra bool acast; 6871da177e4SLinus Torvalds 68803f1ecccSStephen Suryaputra if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) && 68903f1ecccSStephen Suryaputra net->ipv6.sysctl.icmpv6_echo_ignore_multicast) 69003f1ecccSStephen Suryaputra return; 69103f1ecccSStephen Suryaputra 6920660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 6931da177e4SLinus Torvalds 6940b03a5caSStephen Suryaputra acast = ipv6_anycast_destination(skb_dst(skb), saddr); 6950b03a5caSStephen Suryaputra if (acast && net->ipv6.sysctl.icmpv6_echo_ignore_anycast) 6960b03a5caSStephen Suryaputra return; 6970b03a5caSStephen Suryaputra 698509aba3bSFX Le Bail if (!ipv6_unicast_destination(skb) && 6990b03a5caSStephen Suryaputra !(net->ipv6.sysctl.anycast_src_echo_reply && acast)) 7001da177e4SLinus Torvalds saddr = NULL; 7011da177e4SLinus Torvalds 7021da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 7031da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 7041da177e4SLinus Torvalds 7054c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 706a346abe0SEric Dumazet if (net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES) 707a346abe0SEric Dumazet fl6.flowlabel = ip6_flowlabel(ipv6_hdr(skb)); 708a346abe0SEric Dumazet 7094c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 7104e3fd7a0SAlexey Dobriyan fl6.daddr = ipv6_hdr(skb)->saddr; 7111da177e4SLinus Torvalds if (saddr) 7124e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 7131b70d792SDavid Ahern fl6.flowi6_oif = icmp6_iif(skb); 7141958b856SDavid S. Miller fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; 715e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 716e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 7174c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 7181da177e4SLinus Torvalds 7197ba91ecbSJesper Dangaard Brouer local_bh_disable(); 720fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 72163159f29SIan Morris if (!sk) 7227ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 723e110861fSLorenzo Colitti sk->sk_mark = mark; 724fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 725405666dbSDenis V. Lunev 7264c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 7274c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 728c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 729c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 7301da177e4SLinus Torvalds 7314e64b1edSJoe Perches if (ip6_dst_lookup(net, sk, &dst, &fl6)) 7321da177e4SLinus Torvalds goto out; 7334c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); 734452edd59SDavid S. Miller if (IS_ERR(dst)) 735e104411bSPatrick McHardy goto out; 7361da177e4SLinus Torvalds 7370bc19985SStephen Suryaputra /* Check the ratelimit */ 7380bc19985SStephen Suryaputra if ((!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, ICMPV6_ECHO_REPLY)) || 7390bc19985SStephen Suryaputra !icmpv6_xrlim_allow(sk, ICMPV6_ECHO_REPLY, &fl6)) 7400bc19985SStephen Suryaputra goto out_dst_release; 7410bc19985SStephen Suryaputra 742cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds msg.skb = skb; 7451da177e4SLinus Torvalds msg.offset = 0; 746763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 7471da177e4SLinus Torvalds 748b515430aSWillem de Bruijn ipcm6_init_sk(&ipc6, np); 74926879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 75026879da5SWei Wang ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 75126879da5SWei Wang 7524e64b1edSJoe Perches if (ip6_append_data(sk, icmpv6_getfrag, &msg, 7534e64b1edSJoe Perches skb->len + sizeof(struct icmp6hdr), 75426879da5SWei Wang sizeof(struct icmp6hdr), &ipc6, &fl6, 7555fdaa88dSWillem de Bruijn (struct rt6_info *)dst, MSG_DONTWAIT)) { 756a16292a0SEric Dumazet __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 7571da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 758cfdf7647SEric Dumazet } else { 7594e64b1edSJoe Perches icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 760cfdf7647SEric Dumazet skb->len + sizeof(struct icmp6hdr)); 7611da177e4SLinus Torvalds } 7620bc19985SStephen Suryaputra out_dst_release: 7631da177e4SLinus Torvalds dst_release(dst); 7641da177e4SLinus Torvalds out: 765405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 7667ba91ecbSJesper Dangaard Brouer out_bh_enable: 7677ba91ecbSJesper Dangaard Brouer local_bh_enable(); 7681da177e4SLinus Torvalds } 7691da177e4SLinus Torvalds 770b94f1c09SDavid S. Miller void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 7711da177e4SLinus Torvalds { 77241135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 7731da177e4SLinus Torvalds int inner_offset; 77475f2811cSJesse Gross __be16 frag_off; 775f9242b6bSDavid S. Miller u8 nexthdr; 7767304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 7771da177e4SLinus Torvalds 7781da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 7797304fe46SDuan Jiong goto out; 7801da177e4SLinus Torvalds 7811da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 7821da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 7831da177e4SLinus Torvalds /* now skip over extension headers */ 78475f2811cSJesse Gross inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 78575f2811cSJesse Gross &nexthdr, &frag_off); 7861da177e4SLinus Torvalds if (inner_offset < 0) 7877304fe46SDuan Jiong goto out; 7881da177e4SLinus Torvalds } else { 7891da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 7901da177e4SLinus Torvalds } 7911da177e4SLinus Torvalds 7921da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 7931da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 7947304fe46SDuan Jiong goto out; 7951da177e4SLinus Torvalds 7961da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 7971da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 7981da177e4SLinus Torvalds pmtu discovery. 7991da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 8001da177e4SLinus Torvalds --ANK (980726) 8011da177e4SLinus Torvalds */ 8021da177e4SLinus Torvalds 803f9242b6bSDavid S. Miller ipprot = rcu_dereference(inet6_protos[nexthdr]); 8041da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 8051da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 8061da177e4SLinus Torvalds 80769d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 8087304fe46SDuan Jiong return; 8097304fe46SDuan Jiong 8107304fe46SDuan Jiong out: 811a16292a0SEric Dumazet __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); 8121da177e4SLinus Torvalds } 8131da177e4SLinus Torvalds 8141da177e4SLinus Torvalds /* 8151da177e4SLinus Torvalds * Handle icmp messages 8161da177e4SLinus Torvalds */ 8171da177e4SLinus Torvalds 818e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 8191da177e4SLinus Torvalds { 820e6f86b0fSVirgile Jarry struct net *net = dev_net(skb->dev); 821e1ae5c2eSStephen Suryaputra struct net_device *dev = icmp6_dev(skb); 8221da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 823b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 8241da177e4SLinus Torvalds struct icmp6hdr *hdr; 825d5fdd6baSBrian Haley u8 type; 826e3e32170SRick Jones bool success = false; 8271da177e4SLinus Torvalds 828aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 829def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 8308b7817f3SHerbert Xu int nh; 8318b7817f3SHerbert Xu 832def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 833aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 834aebcf82cSHerbert Xu goto drop_no_count; 835aebcf82cSHerbert Xu 83681aded24SDavid S. Miller if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) 8378b7817f3SHerbert Xu goto drop_no_count; 8388b7817f3SHerbert Xu 8398b7817f3SHerbert Xu nh = skb_network_offset(skb); 8408b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 8418b7817f3SHerbert Xu 8428b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 8438b7817f3SHerbert Xu goto drop_no_count; 8448b7817f3SHerbert Xu 8458b7817f3SHerbert Xu skb_set_network_header(skb, nh); 8468b7817f3SHerbert Xu } 8478b7817f3SHerbert Xu 848a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS); 8491da177e4SLinus Torvalds 8500660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 8510660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 8521da177e4SLinus Torvalds 85339471ac8STom Herbert if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { 854ba7a46f1SJoe Perches net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", 8550c6ce78aSHarvey Harrison saddr, daddr); 8566a5dc9e5SEric Dumazet goto csum_error; 8571da177e4SLinus Torvalds } 8581da177e4SLinus Torvalds 8598cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 8608cf22943SHerbert Xu goto discard_it; 8611da177e4SLinus Torvalds 862cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 8631da177e4SLinus Torvalds 8641da177e4SLinus Torvalds type = hdr->icmp6_type; 8651da177e4SLinus Torvalds 866f3832ed2SEric Dumazet ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type); 8671da177e4SLinus Torvalds 8681da177e4SLinus Torvalds switch (type) { 8691da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 870e6f86b0fSVirgile Jarry if (!net->ipv6.sysctl.icmpv6_echo_ignore_all) 8711da177e4SLinus Torvalds icmpv6_echo_reply(skb); 8721da177e4SLinus Torvalds break; 8731da177e4SLinus Torvalds 8741da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 875e3e32170SRick Jones success = ping_rcv(skb); 8761da177e4SLinus Torvalds break; 8771da177e4SLinus Torvalds 8781da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 8791da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 8801da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 8811da177e4SLinus Torvalds destination cache will allow to solve this problem 8821da177e4SLinus Torvalds --ANK (980726) 8831da177e4SLinus Torvalds */ 8841da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 8851da177e4SLinus Torvalds goto discard_it; 886cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 8871da177e4SLinus Torvalds 888275757e6SGustavo A. R. Silva /* to notify */ 889275757e6SGustavo A. R. Silva /* fall through */ 8901da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 8911da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 8921da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 8931da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 8941da177e4SLinus Torvalds break; 8951da177e4SLinus Torvalds 8961da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 8971da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 8981da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 8991da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 9001da177e4SLinus Torvalds case NDISC_REDIRECT: 9011da177e4SLinus Torvalds ndisc_rcv(skb); 9021da177e4SLinus Torvalds break; 9031da177e4SLinus Torvalds 9041da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 9051da177e4SLinus Torvalds igmp6_event_query(skb); 9061da177e4SLinus Torvalds break; 9071da177e4SLinus Torvalds 9081da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 9091da177e4SLinus Torvalds igmp6_event_report(skb); 9101da177e4SLinus Torvalds break; 9111da177e4SLinus Torvalds 9121da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 9131da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 9141da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 9151da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 9161da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 9171da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 9181da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 9191da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 9201da177e4SLinus Torvalds break; 9211da177e4SLinus Torvalds 9221da177e4SLinus Torvalds default: 9231da177e4SLinus Torvalds /* informational */ 9241da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 9251da177e4SLinus Torvalds break; 9261da177e4SLinus Torvalds 9274b3418fbSBjørn Mork net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n", 9284b3418fbSBjørn Mork saddr, daddr); 929ea85a0a2SDavid S. Miller 9301da177e4SLinus Torvalds /* 9311da177e4SLinus Torvalds * error of unknown type. 9321da177e4SLinus Torvalds * must pass to upper level 9331da177e4SLinus Torvalds */ 9341da177e4SLinus Torvalds 9351da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 9363ff50b79SStephen Hemminger } 9373ff50b79SStephen Hemminger 938e3e32170SRick Jones /* until the v6 path can be better sorted assume failure and 939e3e32170SRick Jones * preserve the status quo behaviour for the rest of the paths to here 940e3e32170SRick Jones */ 941e3e32170SRick Jones if (success) 942e3e32170SRick Jones consume_skb(skb); 943e3e32170SRick Jones else 9441da177e4SLinus Torvalds kfree_skb(skb); 945e3e32170SRick Jones 9461da177e4SLinus Torvalds return 0; 9471da177e4SLinus Torvalds 9486a5dc9e5SEric Dumazet csum_error: 949a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); 9501da177e4SLinus Torvalds discard_it: 951a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS); 9528b7817f3SHerbert Xu drop_no_count: 9531da177e4SLinus Torvalds kfree_skb(skb); 9541da177e4SLinus Torvalds return 0; 9551da177e4SLinus Torvalds } 9561da177e4SLinus Torvalds 9574c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, 95895e41e93SYOSHIFUJI Hideaki u8 type, 95995e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 96095e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 96195e41e93SYOSHIFUJI Hideaki int oif) 96295e41e93SYOSHIFUJI Hideaki { 9634c9483b2SDavid S. Miller memset(fl6, 0, sizeof(*fl6)); 9644e3fd7a0SAlexey Dobriyan fl6->saddr = *saddr; 9654e3fd7a0SAlexey Dobriyan fl6->daddr = *daddr; 9664c9483b2SDavid S. Miller fl6->flowi6_proto = IPPROTO_ICMPV6; 9671958b856SDavid S. Miller fl6->fl6_icmp_type = type; 9681958b856SDavid S. Miller fl6->fl6_icmp_code = 0; 9694c9483b2SDavid S. Miller fl6->flowi6_oif = oif; 9704c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); 97195e41e93SYOSHIFUJI Hideaki } 97295e41e93SYOSHIFUJI Hideaki 9733232a1efSKefeng Wang static void __net_exit icmpv6_sk_exit(struct net *net) 9743232a1efSKefeng Wang { 9753232a1efSKefeng Wang int i; 9763232a1efSKefeng Wang 9773232a1efSKefeng Wang for_each_possible_cpu(i) 97875efc250SKefeng Wang inet_ctl_sock_destroy(*per_cpu_ptr(net->ipv6.icmp_sk, i)); 97975efc250SKefeng Wang free_percpu(net->ipv6.icmp_sk); 9803232a1efSKefeng Wang } 9813232a1efSKefeng Wang 98298c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 9831da177e4SLinus Torvalds { 9841da177e4SLinus Torvalds struct sock *sk; 9853232a1efSKefeng Wang int err, i; 9861da177e4SLinus Torvalds 98775efc250SKefeng Wang net->ipv6.icmp_sk = alloc_percpu(struct sock *); 98863159f29SIan Morris if (!net->ipv6.icmp_sk) 98979c91159SDenis V. Lunev return -ENOMEM; 99079c91159SDenis V. Lunev 9916f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 9921ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 9931ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 9941da177e4SLinus Torvalds if (err < 0) { 995f3213831SJoe Perches pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", 9961da177e4SLinus Torvalds err); 9971da177e4SLinus Torvalds goto fail; 9981da177e4SLinus Torvalds } 9991da177e4SLinus Torvalds 100075efc250SKefeng Wang *per_cpu_ptr(net->ipv6.icmp_sk, i) = sk; 10015c8cafd6SDenis V. Lunev 10021da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 10031da177e4SLinus Torvalds * sk_buff struct overhead. 10041da177e4SLinus Torvalds */ 100587fb4b7bSEric Dumazet sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); 10061da177e4SLinus Torvalds } 10071da177e4SLinus Torvalds return 0; 10081da177e4SLinus Torvalds 10091da177e4SLinus Torvalds fail: 10103232a1efSKefeng Wang icmpv6_sk_exit(net); 10111da177e4SLinus Torvalds return err; 10121da177e4SLinus Torvalds } 10131da177e4SLinus Torvalds 10148ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 101598c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 101698c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 101798c6d1b2SDenis V. Lunev }; 101898c6d1b2SDenis V. Lunev 101998c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 102098c6d1b2SDenis V. Lunev { 102198c6d1b2SDenis V. Lunev int err; 102298c6d1b2SDenis V. Lunev 102398c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 102498c6d1b2SDenis V. Lunev if (err < 0) 102598c6d1b2SDenis V. Lunev return err; 102698c6d1b2SDenis V. Lunev 102798c6d1b2SDenis V. Lunev err = -EAGAIN; 102898c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 102998c6d1b2SDenis V. Lunev goto fail; 10305f5624cfSPravin B Shelar 10315f5624cfSPravin B Shelar err = inet6_register_icmp_sender(icmp6_send); 10325f5624cfSPravin B Shelar if (err) 10335f5624cfSPravin B Shelar goto sender_reg_err; 103498c6d1b2SDenis V. Lunev return 0; 103598c6d1b2SDenis V. Lunev 10365f5624cfSPravin B Shelar sender_reg_err: 10375f5624cfSPravin B Shelar inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 103898c6d1b2SDenis V. Lunev fail: 1039f3213831SJoe Perches pr_err("Failed to register ICMP6 protocol\n"); 104098c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 104198c6d1b2SDenis V. Lunev return err; 104298c6d1b2SDenis V. Lunev } 104398c6d1b2SDenis V. Lunev 10448ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 104598c6d1b2SDenis V. Lunev { 10465f5624cfSPravin B Shelar inet6_unregister_icmp_sender(icmp6_send); 104798c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 10481da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 10491da177e4SLinus Torvalds } 10501da177e4SLinus Torvalds 105198c6d1b2SDenis V. Lunev 10529b5b5cffSArjan van de Ven static const struct icmp6_err { 10531da177e4SLinus Torvalds int err; 10541da177e4SLinus Torvalds int fatal; 10551da177e4SLinus Torvalds } tab_unreach[] = { 10561da177e4SLinus Torvalds { /* NOROUTE */ 10571da177e4SLinus Torvalds .err = ENETUNREACH, 10581da177e4SLinus Torvalds .fatal = 0, 10591da177e4SLinus Torvalds }, 10601da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 10611da177e4SLinus Torvalds .err = EACCES, 10621da177e4SLinus Torvalds .fatal = 1, 10631da177e4SLinus Torvalds }, 10641da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 10651da177e4SLinus Torvalds .err = EHOSTUNREACH, 10661da177e4SLinus Torvalds .fatal = 0, 10671da177e4SLinus Torvalds }, 10681da177e4SLinus Torvalds { /* ADDR_UNREACH */ 10691da177e4SLinus Torvalds .err = EHOSTUNREACH, 10701da177e4SLinus Torvalds .fatal = 0, 10711da177e4SLinus Torvalds }, 10721da177e4SLinus Torvalds { /* PORT_UNREACH */ 10731da177e4SLinus Torvalds .err = ECONNREFUSED, 10741da177e4SLinus Torvalds .fatal = 1, 10751da177e4SLinus Torvalds }, 107661e76b17SJiri Bohac { /* POLICY_FAIL */ 107761e76b17SJiri Bohac .err = EACCES, 107861e76b17SJiri Bohac .fatal = 1, 107961e76b17SJiri Bohac }, 108061e76b17SJiri Bohac { /* REJECT_ROUTE */ 108161e76b17SJiri Bohac .err = EACCES, 108261e76b17SJiri Bohac .fatal = 1, 108361e76b17SJiri Bohac }, 10841da177e4SLinus Torvalds }; 10851da177e4SLinus Torvalds 1086d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 10871da177e4SLinus Torvalds { 10881da177e4SLinus Torvalds int fatal = 0; 10891da177e4SLinus Torvalds 10901da177e4SLinus Torvalds *err = EPROTO; 10911da177e4SLinus Torvalds 10921da177e4SLinus Torvalds switch (type) { 10931da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 10941da177e4SLinus Torvalds fatal = 1; 109561e76b17SJiri Bohac if (code < ARRAY_SIZE(tab_unreach)) { 10961da177e4SLinus Torvalds *err = tab_unreach[code].err; 10971da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 10981da177e4SLinus Torvalds } 10991da177e4SLinus Torvalds break; 11001da177e4SLinus Torvalds 11011da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 11021da177e4SLinus Torvalds *err = EMSGSIZE; 11031da177e4SLinus Torvalds break; 11041da177e4SLinus Torvalds 11051da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 11061da177e4SLinus Torvalds *err = EPROTO; 11071da177e4SLinus Torvalds fatal = 1; 11081da177e4SLinus Torvalds break; 11091da177e4SLinus Torvalds 11101da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 11111da177e4SLinus Torvalds *err = EHOSTUNREACH; 11121da177e4SLinus Torvalds break; 11133ff50b79SStephen Hemminger } 11141da177e4SLinus Torvalds 11151da177e4SLinus Torvalds return fatal; 11161da177e4SLinus Torvalds } 11177159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 11187159039aSYOSHIFUJI Hideaki 11191da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 1120e8243534Sstephen hemminger static struct ctl_table ipv6_icmp_table_template[] = { 11211da177e4SLinus Torvalds { 11221da177e4SLinus Torvalds .procname = "ratelimit", 112341a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 11241da177e4SLinus Torvalds .maxlen = sizeof(int), 11251da177e4SLinus Torvalds .mode = 0644, 11266d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 11271da177e4SLinus Torvalds }, 1128e6f86b0fSVirgile Jarry { 1129e6f86b0fSVirgile Jarry .procname = "echo_ignore_all", 1130e6f86b0fSVirgile Jarry .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_all, 1131e6f86b0fSVirgile Jarry .maxlen = sizeof(int), 1132e6f86b0fSVirgile Jarry .mode = 0644, 1133e6f86b0fSVirgile Jarry .proc_handler = proc_dointvec, 1134e6f86b0fSVirgile Jarry }, 113503f1ecccSStephen Suryaputra { 113603f1ecccSStephen Suryaputra .procname = "echo_ignore_multicast", 113703f1ecccSStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_multicast, 113803f1ecccSStephen Suryaputra .maxlen = sizeof(int), 113903f1ecccSStephen Suryaputra .mode = 0644, 114003f1ecccSStephen Suryaputra .proc_handler = proc_dointvec, 114103f1ecccSStephen Suryaputra }, 11420b03a5caSStephen Suryaputra { 11430b03a5caSStephen Suryaputra .procname = "echo_ignore_anycast", 11440b03a5caSStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_anycast, 11450b03a5caSStephen Suryaputra .maxlen = sizeof(int), 11460b03a5caSStephen Suryaputra .mode = 0644, 11470b03a5caSStephen Suryaputra .proc_handler = proc_dointvec, 11480b03a5caSStephen Suryaputra }, 11490bc19985SStephen Suryaputra { 11500bc19985SStephen Suryaputra .procname = "ratemask", 11510bc19985SStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_ratemask_ptr, 11520bc19985SStephen Suryaputra .maxlen = ICMPV6_MSG_MAX + 1, 11530bc19985SStephen Suryaputra .mode = 0644, 11540bc19985SStephen Suryaputra .proc_handler = proc_do_large_bitmap, 11550bc19985SStephen Suryaputra }, 1156f8572d8fSEric W. Biederman { }, 11571da177e4SLinus Torvalds }; 1158760f2d01SDaniel Lezcano 11592c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 1160760f2d01SDaniel Lezcano { 1161760f2d01SDaniel Lezcano struct ctl_table *table; 1162760f2d01SDaniel Lezcano 1163760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 1164760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 1165760f2d01SDaniel Lezcano GFP_KERNEL); 11665ee09105SYOSHIFUJI Hideaki 1167e6f86b0fSVirgile Jarry if (table) { 11685ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 1169e6f86b0fSVirgile Jarry table[1].data = &net->ipv6.sysctl.icmpv6_echo_ignore_all; 117003f1ecccSStephen Suryaputra table[2].data = &net->ipv6.sysctl.icmpv6_echo_ignore_multicast; 11710b03a5caSStephen Suryaputra table[3].data = &net->ipv6.sysctl.icmpv6_echo_ignore_anycast; 11720bc19985SStephen Suryaputra table[4].data = &net->ipv6.sysctl.icmpv6_ratemask_ptr; 1173e6f86b0fSVirgile Jarry } 1174760f2d01SDaniel Lezcano return table; 1175760f2d01SDaniel Lezcano } 11761da177e4SLinus Torvalds #endif 1177