11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * Internet Control Message Protocol (ICMPv6) 31da177e4SLinus Torvalds * Linux INET6 implementation 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Authors: 61da177e4SLinus Torvalds * Pedro Roque <roque@di.fc.ul.pt> 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * Based on net/ipv4/icmp.c 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * RFC 1885 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 131da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 141da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 151da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 161da177e4SLinus Torvalds */ 171da177e4SLinus Torvalds 181da177e4SLinus Torvalds /* 191da177e4SLinus Torvalds * Changes: 201da177e4SLinus Torvalds * 211da177e4SLinus Torvalds * Andi Kleen : exception handling 221da177e4SLinus Torvalds * Andi Kleen add rate limits. never reply to a icmp. 231da177e4SLinus Torvalds * add more length checks and other fixes. 241da177e4SLinus Torvalds * yoshfuji : ensure to sent parameter problem for 251da177e4SLinus Torvalds * fragments. 261da177e4SLinus Torvalds * YOSHIFUJI Hideaki @USAGI: added sysctl for icmp rate limit. 271da177e4SLinus Torvalds * Randy Dunlap and 281da177e4SLinus Torvalds * YOSHIFUJI Hideaki @USAGI: Per-interface statistics support 291da177e4SLinus Torvalds * Kazunori MIYAZAWA @USAGI: change output process to use ip6_append_data 301da177e4SLinus Torvalds */ 311da177e4SLinus Torvalds 32f3213831SJoe Perches #define pr_fmt(fmt) "IPv6: " fmt 33f3213831SJoe Perches 341da177e4SLinus Torvalds #include <linux/module.h> 351da177e4SLinus Torvalds #include <linux/errno.h> 361da177e4SLinus Torvalds #include <linux/types.h> 371da177e4SLinus Torvalds #include <linux/socket.h> 381da177e4SLinus Torvalds #include <linux/in.h> 391da177e4SLinus Torvalds #include <linux/kernel.h> 401da177e4SLinus Torvalds #include <linux/sockios.h> 411da177e4SLinus Torvalds #include <linux/net.h> 421da177e4SLinus Torvalds #include <linux/skbuff.h> 431da177e4SLinus Torvalds #include <linux/init.h> 44763ecff1SYasuyuki Kozakai #include <linux/netfilter.h> 455a0e3ad6STejun Heo #include <linux/slab.h> 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 481da177e4SLinus Torvalds #include <linux/sysctl.h> 491da177e4SLinus Torvalds #endif 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds #include <linux/inet.h> 521da177e4SLinus Torvalds #include <linux/netdevice.h> 531da177e4SLinus Torvalds #include <linux/icmpv6.h> 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds #include <net/ip.h> 561da177e4SLinus Torvalds #include <net/sock.h> 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds #include <net/ipv6.h> 591da177e4SLinus Torvalds #include <net/ip6_checksum.h> 606d0bfe22SLorenzo Colitti #include <net/ping.h> 611da177e4SLinus Torvalds #include <net/protocol.h> 621da177e4SLinus Torvalds #include <net/raw.h> 631da177e4SLinus Torvalds #include <net/rawv6.h> 641da177e4SLinus Torvalds #include <net/transp_v6.h> 651da177e4SLinus Torvalds #include <net/ip6_route.h> 661da177e4SLinus Torvalds #include <net/addrconf.h> 671da177e4SLinus Torvalds #include <net/icmp.h> 688b7817f3SHerbert Xu #include <net/xfrm.h> 691ed8516fSDenis V. Lunev #include <net/inet_common.h> 70825edac4SHannes Frederic Sowa #include <net/dsfield.h> 71ca254490SDavid Ahern #include <net/l3mdev.h> 721da177e4SLinus Torvalds 737c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds /* 761da177e4SLinus Torvalds * The ICMP socket(s). This is the most convenient way to flow control 771da177e4SLinus Torvalds * our ICMP output as well as maintain a clean interface throughout 781da177e4SLinus Torvalds * all layers. All Socketless IP sends will soon be gone. 791da177e4SLinus Torvalds * 801da177e4SLinus Torvalds * On SMP we have one ICMP socket per-cpu. 811da177e4SLinus Torvalds */ 8298c6d1b2SDenis V. Lunev static inline struct sock *icmpv6_sk(struct net *net) 8398c6d1b2SDenis V. Lunev { 8475efc250SKefeng Wang return *this_cpu_ptr(net->ipv6.icmp_sk); 8598c6d1b2SDenis V. Lunev } 861da177e4SLinus Torvalds 8732bbd879SStefano Brivio static int icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 886f809da2SSteffen Klassert u8 type, u8 code, int offset, __be32 info) 896f809da2SSteffen Klassert { 906d0bfe22SLorenzo Colitti /* icmpv6_notify checks 8 bytes can be pulled, icmp6hdr is 8 bytes */ 916d0bfe22SLorenzo Colitti struct icmp6hdr *icmp6 = (struct icmp6hdr *) (skb->data + offset); 926f809da2SSteffen Klassert struct net *net = dev_net(skb->dev); 936f809da2SSteffen Klassert 946f809da2SSteffen Klassert if (type == ICMPV6_PKT_TOOBIG) 955f379ef5SGeorg Kohmann ip6_update_pmtu(skb, net, info, skb->dev->ifindex, 0, sock_net_uid(net, NULL)); 966f809da2SSteffen Klassert else if (type == NDISC_REDIRECT) 97e2d118a1SLorenzo Colitti ip6_redirect(skb, net, skb->dev->ifindex, 0, 98e2d118a1SLorenzo Colitti sock_net_uid(net, NULL)); 996d0bfe22SLorenzo Colitti 1006d0bfe22SLorenzo Colitti if (!(type & ICMPV6_INFOMSG_MASK)) 1016d0bfe22SLorenzo Colitti if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST) 102dcb94b88SHannes Frederic Sowa ping_err(skb, offset, ntohl(info)); 10332bbd879SStefano Brivio 10432bbd879SStefano Brivio return 0; 1056f809da2SSteffen Klassert } 1066f809da2SSteffen Klassert 107e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb); 1081da177e4SLinus Torvalds 10941135cc8SAlexey Dobriyan static const struct inet6_protocol icmpv6_protocol = { 1101da177e4SLinus Torvalds .handler = icmpv6_rcv, 1116f809da2SSteffen Klassert .err_handler = icmpv6_err, 1128b7817f3SHerbert Xu .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1131da177e4SLinus Torvalds }; 1141da177e4SLinus Torvalds 1157ba91ecbSJesper Dangaard Brouer /* Called with BH disabled */ 116fdc0bde9SDenis V. Lunev static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) 1171da177e4SLinus Torvalds { 118fdc0bde9SDenis V. Lunev struct sock *sk; 119fdc0bde9SDenis V. Lunev 120fdc0bde9SDenis V. Lunev sk = icmpv6_sk(net); 121405666dbSDenis V. Lunev if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { 1221da177e4SLinus Torvalds /* This can happen if the output path (f.e. SIT or 1231da177e4SLinus Torvalds * ip6ip6 tunnel) signals dst_link_failure() for an 1241da177e4SLinus Torvalds * outgoing ICMP6 packet. 1251da177e4SLinus Torvalds */ 126fdc0bde9SDenis V. Lunev return NULL; 1271da177e4SLinus Torvalds } 128fdc0bde9SDenis V. Lunev return sk; 1291da177e4SLinus Torvalds } 1301da177e4SLinus Torvalds 131405666dbSDenis V. Lunev static __inline__ void icmpv6_xmit_unlock(struct sock *sk) 1321da177e4SLinus Torvalds { 1337ba91ecbSJesper Dangaard Brouer spin_unlock(&sk->sk_lock.slock); 1341da177e4SLinus Torvalds } 1351da177e4SLinus Torvalds 1361da177e4SLinus Torvalds /* 1371da177e4SLinus Torvalds * Figure out, may we reply to this packet with icmp error. 1381da177e4SLinus Torvalds * 1391da177e4SLinus Torvalds * We do not reply, if: 1401da177e4SLinus Torvalds * - it was icmp error message. 1411da177e4SLinus Torvalds * - it is truncated, so that it is known, that protocol is ICMPV6 1421da177e4SLinus Torvalds * (i.e. in the middle of some exthdr) 1431da177e4SLinus Torvalds * 1441da177e4SLinus Torvalds * --ANK (980726) 1451da177e4SLinus Torvalds */ 1461da177e4SLinus Torvalds 147a50feda5SEric Dumazet static bool is_ineligible(const struct sk_buff *skb) 1481da177e4SLinus Torvalds { 1490660e03fSArnaldo Carvalho de Melo int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; 1501da177e4SLinus Torvalds int len = skb->len - ptr; 1510660e03fSArnaldo Carvalho de Melo __u8 nexthdr = ipv6_hdr(skb)->nexthdr; 15275f2811cSJesse Gross __be16 frag_off; 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds if (len < 0) 155a50feda5SEric Dumazet return true; 1561da177e4SLinus Torvalds 15775f2811cSJesse Gross ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off); 1581da177e4SLinus Torvalds if (ptr < 0) 159a50feda5SEric Dumazet return false; 1601da177e4SLinus Torvalds if (nexthdr == IPPROTO_ICMPV6) { 1611da177e4SLinus Torvalds u8 _type, *tp; 1621da177e4SLinus Torvalds tp = skb_header_pointer(skb, 1631da177e4SLinus Torvalds ptr+offsetof(struct icmp6hdr, icmp6_type), 1641da177e4SLinus Torvalds sizeof(_type), &_type); 16563159f29SIan Morris if (!tp || !(*tp & ICMPV6_INFOMSG_MASK)) 166a50feda5SEric Dumazet return true; 1671da177e4SLinus Torvalds } 168a50feda5SEric Dumazet return false; 1691da177e4SLinus Torvalds } 1701da177e4SLinus Torvalds 171c0303efeSJesper Dangaard Brouer static bool icmpv6_mask_allow(int type) 172c0303efeSJesper Dangaard Brouer { 173c0303efeSJesper Dangaard Brouer /* Informational messages are not limited. */ 174c0303efeSJesper Dangaard Brouer if (type & ICMPV6_INFOMSG_MASK) 175c0303efeSJesper Dangaard Brouer return true; 176c0303efeSJesper Dangaard Brouer 177c0303efeSJesper Dangaard Brouer /* Do not limit pmtu discovery, it would break it. */ 178c0303efeSJesper Dangaard Brouer if (type == ICMPV6_PKT_TOOBIG) 179c0303efeSJesper Dangaard Brouer return true; 180c0303efeSJesper Dangaard Brouer 181c0303efeSJesper Dangaard Brouer return false; 182c0303efeSJesper Dangaard Brouer } 183c0303efeSJesper Dangaard Brouer 184c0303efeSJesper Dangaard Brouer static bool icmpv6_global_allow(int type) 185c0303efeSJesper Dangaard Brouer { 186c0303efeSJesper Dangaard Brouer if (icmpv6_mask_allow(type)) 187c0303efeSJesper Dangaard Brouer return true; 188c0303efeSJesper Dangaard Brouer 189c0303efeSJesper Dangaard Brouer if (icmp_global_allow()) 190c0303efeSJesper Dangaard Brouer return true; 191c0303efeSJesper Dangaard Brouer 192c0303efeSJesper Dangaard Brouer return false; 193c0303efeSJesper Dangaard Brouer } 194c0303efeSJesper Dangaard Brouer 1951da177e4SLinus Torvalds /* 1961da177e4SLinus Torvalds * Check the ICMP output rate limit 1971da177e4SLinus Torvalds */ 1984cdf507dSEric Dumazet static bool icmpv6_xrlim_allow(struct sock *sk, u8 type, 1994c9483b2SDavid S. Miller struct flowi6 *fl6) 2001da177e4SLinus Torvalds { 2013b1e0a65SYOSHIFUJI Hideaki struct net *net = sock_net(sk); 2024cdf507dSEric Dumazet struct dst_entry *dst; 20392d86829SDavid S. Miller bool res = false; 2041da177e4SLinus Torvalds 205c0303efeSJesper Dangaard Brouer if (icmpv6_mask_allow(type)) 20692d86829SDavid S. Miller return true; 2071da177e4SLinus Torvalds 2081da177e4SLinus Torvalds /* 2091da177e4SLinus Torvalds * Look up the output route. 2101da177e4SLinus Torvalds * XXX: perhaps the expire for routing entries cloned by 2111da177e4SLinus Torvalds * this lookup should be more aggressive (not longer than timeout). 2121da177e4SLinus Torvalds */ 2134c9483b2SDavid S. Miller dst = ip6_route_output(net, sk, fl6); 2141da177e4SLinus Torvalds if (dst->error) { 2153bd653c8SDenis V. Lunev IP6_INC_STATS(net, ip6_dst_idev(dst), 216a11d206dSYOSHIFUJI Hideaki IPSTATS_MIB_OUTNOROUTES); 2171da177e4SLinus Torvalds } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { 21892d86829SDavid S. Miller res = true; 2191da177e4SLinus Torvalds } else { 2201da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 2219a43b709SBenjamin Thery int tmo = net->ipv6.sysctl.icmpv6_time; 222c0303efeSJesper Dangaard Brouer struct inet_peer *peer; 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvalds /* Give more bandwidth to wider prefixes. */ 2251da177e4SLinus Torvalds if (rt->rt6i_dst.plen < 128) 2261da177e4SLinus Torvalds tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 2271da177e4SLinus Torvalds 228c0303efeSJesper Dangaard Brouer peer = inet_getpeer_v6(net->ipv6.peers, &fl6->daddr, 1); 229fbfe95a4SDavid S. Miller res = inet_peer_xrlim_allow(peer, tmo); 2301d861aa4SDavid S. Miller if (peer) 2311d861aa4SDavid S. Miller inet_putpeer(peer); 2321da177e4SLinus Torvalds } 2331da177e4SLinus Torvalds dst_release(dst); 2341da177e4SLinus Torvalds return res; 2351da177e4SLinus Torvalds } 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds /* 2381da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2391da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2401da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2411da177e4SLinus Torvalds * highest-order two bits set to 10 2421da177e4SLinus Torvalds */ 2431da177e4SLinus Torvalds 244a50feda5SEric Dumazet static bool opt_unrec(struct sk_buff *skb, __u32 offset) 2451da177e4SLinus Torvalds { 2461da177e4SLinus Torvalds u8 _optval, *op; 2471da177e4SLinus Torvalds 248bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2491da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 25063159f29SIan Morris if (!op) 251a50feda5SEric Dumazet return true; 2521da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2531da177e4SLinus Torvalds } 2541da177e4SLinus Torvalds 2554e64b1edSJoe Perches void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 2566d0bfe22SLorenzo Colitti struct icmp6hdr *thdr, int len) 2571da177e4SLinus Torvalds { 2581da177e4SLinus Torvalds struct sk_buff *skb; 2591da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2601da177e4SLinus Torvalds 261e5d08d71SIan Morris skb = skb_peek(&sk->sk_write_queue); 26263159f29SIan Morris if (!skb) 2634e64b1edSJoe Perches return; 2641da177e4SLinus Torvalds 265cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2661da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2671da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 27007f0757aSJoe Perches skb->csum = csum_partial(icmp6h, 2711da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2724c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2734c9483b2SDavid S. Miller &fl6->daddr, 2744c9483b2SDavid S. Miller len, fl6->flowi6_proto, 2751da177e4SLinus Torvalds skb->csum); 2761da177e4SLinus Torvalds } else { 277868c86bcSAl Viro __wsum tmp_csum = 0; 2781da177e4SLinus Torvalds 2791da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2801da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2811da177e4SLinus Torvalds } 2821da177e4SLinus Torvalds 28307f0757aSJoe Perches tmp_csum = csum_partial(icmp6h, 2841da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 2854c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2864c9483b2SDavid S. Miller &fl6->daddr, 2874c9483b2SDavid S. Miller len, fl6->flowi6_proto, 288868c86bcSAl Viro tmp_csum); 2891da177e4SLinus Torvalds } 2901da177e4SLinus Torvalds ip6_push_pending_frames(sk); 2911da177e4SLinus Torvalds } 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds struct icmpv6_msg { 2941da177e4SLinus Torvalds struct sk_buff *skb; 2951da177e4SLinus Torvalds int offset; 296763ecff1SYasuyuki Kozakai uint8_t type; 2971da177e4SLinus Torvalds }; 2981da177e4SLinus Torvalds 2991da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 3001da177e4SLinus Torvalds { 3011da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 3021da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 3035f92a738SAl Viro __wsum csum = 0; 3041da177e4SLinus Torvalds 3051da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 3061da177e4SLinus Torvalds to, len, csum); 3071da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 308763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 309763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 3101da177e4SLinus Torvalds return 0; 3111da177e4SLinus Torvalds } 3121da177e4SLinus Torvalds 31307a93626SAmerigo Wang #if IS_ENABLED(CONFIG_IPV6_MIP6) 31479383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 31579383236SMasahide NAKAMURA { 3160660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 31779383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 31879383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 31979383236SMasahide NAKAMURA struct in6_addr tmp; 32079383236SMasahide NAKAMURA int off; 32179383236SMasahide NAKAMURA 32279383236SMasahide NAKAMURA if (opt->dsthao) { 32379383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 32479383236SMasahide NAKAMURA if (likely(off >= 0)) { 325d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 326d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 3274e3fd7a0SAlexey Dobriyan tmp = iph->saddr; 3284e3fd7a0SAlexey Dobriyan iph->saddr = hao->addr; 3294e3fd7a0SAlexey Dobriyan hao->addr = tmp; 33079383236SMasahide NAKAMURA } 33179383236SMasahide NAKAMURA } 33279383236SMasahide NAKAMURA } 33379383236SMasahide NAKAMURA #else 33479383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 33579383236SMasahide NAKAMURA #endif 33679383236SMasahide NAKAMURA 337e8243534Sstephen hemminger static struct dst_entry *icmpv6_route_lookup(struct net *net, 338e8243534Sstephen hemminger struct sk_buff *skb, 339e8243534Sstephen hemminger struct sock *sk, 340e8243534Sstephen hemminger struct flowi6 *fl6) 341b42835dbSDavid S. Miller { 342b42835dbSDavid S. Miller struct dst_entry *dst, *dst2; 3434c9483b2SDavid S. Miller struct flowi6 fl2; 344b42835dbSDavid S. Miller int err; 345b42835dbSDavid S. Miller 346343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst, fl6); 347b42835dbSDavid S. Miller if (err) 348b42835dbSDavid S. Miller return ERR_PTR(err); 349b42835dbSDavid S. Miller 350b42835dbSDavid S. Miller /* 351b42835dbSDavid S. Miller * We won't send icmp if the destination is known 352b42835dbSDavid S. Miller * anycast. 353b42835dbSDavid S. Miller */ 3542647a9b0SMartin KaFai Lau if (ipv6_anycast_destination(dst, &fl6->daddr)) { 355ba7a46f1SJoe Perches net_dbg_ratelimited("icmp6_send: acast source\n"); 356b42835dbSDavid S. Miller dst_release(dst); 357b42835dbSDavid S. Miller return ERR_PTR(-EINVAL); 358b42835dbSDavid S. Miller } 359b42835dbSDavid S. Miller 360b42835dbSDavid S. Miller /* No need to clone since we're just using its address. */ 361b42835dbSDavid S. Miller dst2 = dst; 362b42835dbSDavid S. Miller 3634c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); 364452edd59SDavid S. Miller if (!IS_ERR(dst)) { 365b42835dbSDavid S. Miller if (dst != dst2) 366b42835dbSDavid S. Miller return dst; 367452edd59SDavid S. Miller } else { 368452edd59SDavid S. Miller if (PTR_ERR(dst) == -EPERM) 369b42835dbSDavid S. Miller dst = NULL; 370452edd59SDavid S. Miller else 371452edd59SDavid S. Miller return dst; 372b42835dbSDavid S. Miller } 373b42835dbSDavid S. Miller 3744c9483b2SDavid S. Miller err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); 375b42835dbSDavid S. Miller if (err) 376b42835dbSDavid S. Miller goto relookup_failed; 377b42835dbSDavid S. Miller 378343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst2, &fl2); 379b42835dbSDavid S. Miller if (err) 380b42835dbSDavid S. Miller goto relookup_failed; 381b42835dbSDavid S. Miller 3824c9483b2SDavid S. Miller dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); 383452edd59SDavid S. Miller if (!IS_ERR(dst2)) { 384b42835dbSDavid S. Miller dst_release(dst); 385b42835dbSDavid S. Miller dst = dst2; 386452edd59SDavid S. Miller } else { 387452edd59SDavid S. Miller err = PTR_ERR(dst2); 388452edd59SDavid S. Miller if (err == -EPERM) { 389b42835dbSDavid S. Miller dst_release(dst); 390452edd59SDavid S. Miller return dst2; 391452edd59SDavid S. Miller } else 392b42835dbSDavid S. Miller goto relookup_failed; 393b42835dbSDavid S. Miller } 394b42835dbSDavid S. Miller 395b42835dbSDavid S. Miller relookup_failed: 396b42835dbSDavid S. Miller if (dst) 397b42835dbSDavid S. Miller return dst; 398b42835dbSDavid S. Miller return ERR_PTR(err); 399b42835dbSDavid S. Miller } 400b42835dbSDavid S. Miller 4011b70d792SDavid Ahern static int icmp6_iif(const struct sk_buff *skb) 4021b70d792SDavid Ahern { 4031b70d792SDavid Ahern int iif = skb->dev->ifindex; 4041b70d792SDavid Ahern 4051b70d792SDavid Ahern /* for local traffic to local address, skb dev is the loopback 4061b70d792SDavid Ahern * device. Check if there is a dst attached to the skb and if so 40724b711edSDavid Ahern * get the real device index. Same is needed for replies to a link 40824b711edSDavid Ahern * local address on a device enslaved to an L3 master device 4091b70d792SDavid Ahern */ 41024b711edSDavid Ahern if (unlikely(iif == LOOPBACK_IFINDEX || netif_is_l3_master(skb->dev))) { 4111b70d792SDavid Ahern const struct rt6_info *rt6 = skb_rt6_info(skb); 4121b70d792SDavid Ahern 4131b70d792SDavid Ahern if (rt6) 4141b70d792SDavid Ahern iif = rt6->rt6i_idev->dev->ifindex; 4151b70d792SDavid Ahern } 4161b70d792SDavid Ahern 4171b70d792SDavid Ahern return iif; 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 */ 514849a44deSJesper Dangaard Brouer if (!(skb->dev->flags&IFF_LOOPBACK) && !icmpv6_global_allow(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)); 7064c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 7074e3fd7a0SAlexey Dobriyan fl6.daddr = ipv6_hdr(skb)->saddr; 7081da177e4SLinus Torvalds if (saddr) 7094e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 7101b70d792SDavid Ahern fl6.flowi6_oif = icmp6_iif(skb); 7111958b856SDavid S. Miller fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; 712e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 713e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 7144c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 7151da177e4SLinus Torvalds 7167ba91ecbSJesper Dangaard Brouer local_bh_disable(); 717fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 71863159f29SIan Morris if (!sk) 7197ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 720e110861fSLorenzo Colitti sk->sk_mark = mark; 721fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 722405666dbSDenis V. Lunev 7234c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 7244c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 725c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 726c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 7271da177e4SLinus Torvalds 7284e64b1edSJoe Perches if (ip6_dst_lookup(net, sk, &dst, &fl6)) 7291da177e4SLinus Torvalds goto out; 7304c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); 731452edd59SDavid S. Miller if (IS_ERR(dst)) 732e104411bSPatrick McHardy goto out; 7331da177e4SLinus Torvalds 734cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 7351da177e4SLinus Torvalds 7361da177e4SLinus Torvalds msg.skb = skb; 7371da177e4SLinus Torvalds msg.offset = 0; 738763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 7391da177e4SLinus Torvalds 740b515430aSWillem de Bruijn ipcm6_init_sk(&ipc6, np); 74126879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 74226879da5SWei Wang ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 74326879da5SWei Wang 7444e64b1edSJoe Perches if (ip6_append_data(sk, icmpv6_getfrag, &msg, 7454e64b1edSJoe Perches skb->len + sizeof(struct icmp6hdr), 74626879da5SWei Wang sizeof(struct icmp6hdr), &ipc6, &fl6, 7475fdaa88dSWillem de Bruijn (struct rt6_info *)dst, MSG_DONTWAIT)) { 748a16292a0SEric Dumazet __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 7491da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 750cfdf7647SEric Dumazet } else { 7514e64b1edSJoe Perches icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 752cfdf7647SEric Dumazet skb->len + sizeof(struct icmp6hdr)); 7531da177e4SLinus Torvalds } 7541da177e4SLinus Torvalds dst_release(dst); 7551da177e4SLinus Torvalds out: 756405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 7577ba91ecbSJesper Dangaard Brouer out_bh_enable: 7587ba91ecbSJesper Dangaard Brouer local_bh_enable(); 7591da177e4SLinus Torvalds } 7601da177e4SLinus Torvalds 761b94f1c09SDavid S. Miller void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 7621da177e4SLinus Torvalds { 76341135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 7641da177e4SLinus Torvalds int inner_offset; 76575f2811cSJesse Gross __be16 frag_off; 766f9242b6bSDavid S. Miller u8 nexthdr; 7677304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 7681da177e4SLinus Torvalds 7691da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 7707304fe46SDuan Jiong goto out; 7711da177e4SLinus Torvalds 7721da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 7731da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 7741da177e4SLinus Torvalds /* now skip over extension headers */ 77575f2811cSJesse Gross inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 77675f2811cSJesse Gross &nexthdr, &frag_off); 7771da177e4SLinus Torvalds if (inner_offset < 0) 7787304fe46SDuan Jiong goto out; 7791da177e4SLinus Torvalds } else { 7801da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 7811da177e4SLinus Torvalds } 7821da177e4SLinus Torvalds 7831da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 7841da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 7857304fe46SDuan Jiong goto out; 7861da177e4SLinus Torvalds 7871da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 7881da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 7891da177e4SLinus Torvalds pmtu discovery. 7901da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 7911da177e4SLinus Torvalds --ANK (980726) 7921da177e4SLinus Torvalds */ 7931da177e4SLinus Torvalds 794f9242b6bSDavid S. Miller ipprot = rcu_dereference(inet6_protos[nexthdr]); 7951da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 7961da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 7971da177e4SLinus Torvalds 79869d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 7997304fe46SDuan Jiong return; 8007304fe46SDuan Jiong 8017304fe46SDuan Jiong out: 802a16292a0SEric Dumazet __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); 8031da177e4SLinus Torvalds } 8041da177e4SLinus Torvalds 8051da177e4SLinus Torvalds /* 8061da177e4SLinus Torvalds * Handle icmp messages 8071da177e4SLinus Torvalds */ 8081da177e4SLinus Torvalds 809e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 8101da177e4SLinus Torvalds { 811e6f86b0fSVirgile Jarry struct net *net = dev_net(skb->dev); 8121da177e4SLinus Torvalds struct net_device *dev = skb->dev; 8131da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 814b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 8151da177e4SLinus Torvalds struct icmp6hdr *hdr; 816d5fdd6baSBrian Haley u8 type; 817e3e32170SRick Jones bool success = false; 8181da177e4SLinus Torvalds 819aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 820def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 8218b7817f3SHerbert Xu int nh; 8228b7817f3SHerbert Xu 823def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 824aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 825aebcf82cSHerbert Xu goto drop_no_count; 826aebcf82cSHerbert Xu 82781aded24SDavid S. Miller if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) 8288b7817f3SHerbert Xu goto drop_no_count; 8298b7817f3SHerbert Xu 8308b7817f3SHerbert Xu nh = skb_network_offset(skb); 8318b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 8328b7817f3SHerbert Xu 8338b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 8348b7817f3SHerbert Xu goto drop_no_count; 8358b7817f3SHerbert Xu 8368b7817f3SHerbert Xu skb_set_network_header(skb, nh); 8378b7817f3SHerbert Xu } 8388b7817f3SHerbert Xu 839a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS); 8401da177e4SLinus Torvalds 8410660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 8420660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 8431da177e4SLinus Torvalds 84439471ac8STom Herbert if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { 845ba7a46f1SJoe Perches net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", 8460c6ce78aSHarvey Harrison saddr, daddr); 8476a5dc9e5SEric Dumazet goto csum_error; 8481da177e4SLinus Torvalds } 8491da177e4SLinus Torvalds 8508cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 8518cf22943SHerbert Xu goto discard_it; 8521da177e4SLinus Torvalds 853cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 8541da177e4SLinus Torvalds 8551da177e4SLinus Torvalds type = hdr->icmp6_type; 8561da177e4SLinus Torvalds 857f3832ed2SEric Dumazet ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type); 8581da177e4SLinus Torvalds 8591da177e4SLinus Torvalds switch (type) { 8601da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 861e6f86b0fSVirgile Jarry if (!net->ipv6.sysctl.icmpv6_echo_ignore_all) 8621da177e4SLinus Torvalds icmpv6_echo_reply(skb); 8631da177e4SLinus Torvalds break; 8641da177e4SLinus Torvalds 8651da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 866e3e32170SRick Jones success = ping_rcv(skb); 8671da177e4SLinus Torvalds break; 8681da177e4SLinus Torvalds 8691da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 8701da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 8711da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 8721da177e4SLinus Torvalds destination cache will allow to solve this problem 8731da177e4SLinus Torvalds --ANK (980726) 8741da177e4SLinus Torvalds */ 8751da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 8761da177e4SLinus Torvalds goto discard_it; 877cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 8781da177e4SLinus Torvalds 879275757e6SGustavo A. R. Silva /* to notify */ 880275757e6SGustavo A. R. Silva /* fall through */ 8811da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 8821da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 8831da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 8841da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 8851da177e4SLinus Torvalds break; 8861da177e4SLinus Torvalds 8871da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 8881da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 8891da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 8901da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 8911da177e4SLinus Torvalds case NDISC_REDIRECT: 8921da177e4SLinus Torvalds ndisc_rcv(skb); 8931da177e4SLinus Torvalds break; 8941da177e4SLinus Torvalds 8951da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 8961da177e4SLinus Torvalds igmp6_event_query(skb); 8971da177e4SLinus Torvalds break; 8981da177e4SLinus Torvalds 8991da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 9001da177e4SLinus Torvalds igmp6_event_report(skb); 9011da177e4SLinus Torvalds break; 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 9041da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 9051da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 9061da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 9071da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 9081da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 9091da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 9101da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 9111da177e4SLinus Torvalds break; 9121da177e4SLinus Torvalds 9131da177e4SLinus Torvalds default: 9141da177e4SLinus Torvalds /* informational */ 9151da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 9161da177e4SLinus Torvalds break; 9171da177e4SLinus Torvalds 9184b3418fbSBjørn Mork net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n", 9194b3418fbSBjørn Mork saddr, daddr); 920ea85a0a2SDavid S. Miller 9211da177e4SLinus Torvalds /* 9221da177e4SLinus Torvalds * error of unknown type. 9231da177e4SLinus Torvalds * must pass to upper level 9241da177e4SLinus Torvalds */ 9251da177e4SLinus Torvalds 9261da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 9273ff50b79SStephen Hemminger } 9283ff50b79SStephen Hemminger 929e3e32170SRick Jones /* until the v6 path can be better sorted assume failure and 930e3e32170SRick Jones * preserve the status quo behaviour for the rest of the paths to here 931e3e32170SRick Jones */ 932e3e32170SRick Jones if (success) 933e3e32170SRick Jones consume_skb(skb); 934e3e32170SRick Jones else 9351da177e4SLinus Torvalds kfree_skb(skb); 936e3e32170SRick Jones 9371da177e4SLinus Torvalds return 0; 9381da177e4SLinus Torvalds 9396a5dc9e5SEric Dumazet csum_error: 940a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); 9411da177e4SLinus Torvalds discard_it: 942a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS); 9438b7817f3SHerbert Xu drop_no_count: 9441da177e4SLinus Torvalds kfree_skb(skb); 9451da177e4SLinus Torvalds return 0; 9461da177e4SLinus Torvalds } 9471da177e4SLinus Torvalds 9484c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, 94995e41e93SYOSHIFUJI Hideaki u8 type, 95095e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 95195e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 95295e41e93SYOSHIFUJI Hideaki int oif) 95395e41e93SYOSHIFUJI Hideaki { 9544c9483b2SDavid S. Miller memset(fl6, 0, sizeof(*fl6)); 9554e3fd7a0SAlexey Dobriyan fl6->saddr = *saddr; 9564e3fd7a0SAlexey Dobriyan fl6->daddr = *daddr; 9574c9483b2SDavid S. Miller fl6->flowi6_proto = IPPROTO_ICMPV6; 9581958b856SDavid S. Miller fl6->fl6_icmp_type = type; 9591958b856SDavid S. Miller fl6->fl6_icmp_code = 0; 9604c9483b2SDavid S. Miller fl6->flowi6_oif = oif; 9614c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); 96295e41e93SYOSHIFUJI Hideaki } 96395e41e93SYOSHIFUJI Hideaki 9643232a1efSKefeng Wang static void __net_exit icmpv6_sk_exit(struct net *net) 9653232a1efSKefeng Wang { 9663232a1efSKefeng Wang int i; 9673232a1efSKefeng Wang 9683232a1efSKefeng Wang for_each_possible_cpu(i) 96975efc250SKefeng Wang inet_ctl_sock_destroy(*per_cpu_ptr(net->ipv6.icmp_sk, i)); 97075efc250SKefeng Wang free_percpu(net->ipv6.icmp_sk); 9713232a1efSKefeng Wang } 9723232a1efSKefeng Wang 97398c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 9741da177e4SLinus Torvalds { 9751da177e4SLinus Torvalds struct sock *sk; 9763232a1efSKefeng Wang int err, i; 9771da177e4SLinus Torvalds 97875efc250SKefeng Wang net->ipv6.icmp_sk = alloc_percpu(struct sock *); 97963159f29SIan Morris if (!net->ipv6.icmp_sk) 98079c91159SDenis V. Lunev return -ENOMEM; 98179c91159SDenis V. Lunev 9826f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 9831ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 9841ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 9851da177e4SLinus Torvalds if (err < 0) { 986f3213831SJoe Perches pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", 9871da177e4SLinus Torvalds err); 9881da177e4SLinus Torvalds goto fail; 9891da177e4SLinus Torvalds } 9901da177e4SLinus Torvalds 99175efc250SKefeng Wang *per_cpu_ptr(net->ipv6.icmp_sk, i) = sk; 9925c8cafd6SDenis V. Lunev 9931da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 9941da177e4SLinus Torvalds * sk_buff struct overhead. 9951da177e4SLinus Torvalds */ 99687fb4b7bSEric Dumazet sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); 9971da177e4SLinus Torvalds } 9981da177e4SLinus Torvalds return 0; 9991da177e4SLinus Torvalds 10001da177e4SLinus Torvalds fail: 10013232a1efSKefeng Wang icmpv6_sk_exit(net); 10021da177e4SLinus Torvalds return err; 10031da177e4SLinus Torvalds } 10041da177e4SLinus Torvalds 10058ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 100698c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 100798c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 100898c6d1b2SDenis V. Lunev }; 100998c6d1b2SDenis V. Lunev 101098c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 101198c6d1b2SDenis V. Lunev { 101298c6d1b2SDenis V. Lunev int err; 101398c6d1b2SDenis V. Lunev 101498c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 101598c6d1b2SDenis V. Lunev if (err < 0) 101698c6d1b2SDenis V. Lunev return err; 101798c6d1b2SDenis V. Lunev 101898c6d1b2SDenis V. Lunev err = -EAGAIN; 101998c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 102098c6d1b2SDenis V. Lunev goto fail; 10215f5624cfSPravin B Shelar 10225f5624cfSPravin B Shelar err = inet6_register_icmp_sender(icmp6_send); 10235f5624cfSPravin B Shelar if (err) 10245f5624cfSPravin B Shelar goto sender_reg_err; 102598c6d1b2SDenis V. Lunev return 0; 102698c6d1b2SDenis V. Lunev 10275f5624cfSPravin B Shelar sender_reg_err: 10285f5624cfSPravin B Shelar inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 102998c6d1b2SDenis V. Lunev fail: 1030f3213831SJoe Perches pr_err("Failed to register ICMP6 protocol\n"); 103198c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 103298c6d1b2SDenis V. Lunev return err; 103398c6d1b2SDenis V. Lunev } 103498c6d1b2SDenis V. Lunev 10358ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 103698c6d1b2SDenis V. Lunev { 10375f5624cfSPravin B Shelar inet6_unregister_icmp_sender(icmp6_send); 103898c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 10391da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 10401da177e4SLinus Torvalds } 10411da177e4SLinus Torvalds 104298c6d1b2SDenis V. Lunev 10439b5b5cffSArjan van de Ven static const struct icmp6_err { 10441da177e4SLinus Torvalds int err; 10451da177e4SLinus Torvalds int fatal; 10461da177e4SLinus Torvalds } tab_unreach[] = { 10471da177e4SLinus Torvalds { /* NOROUTE */ 10481da177e4SLinus Torvalds .err = ENETUNREACH, 10491da177e4SLinus Torvalds .fatal = 0, 10501da177e4SLinus Torvalds }, 10511da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 10521da177e4SLinus Torvalds .err = EACCES, 10531da177e4SLinus Torvalds .fatal = 1, 10541da177e4SLinus Torvalds }, 10551da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 10561da177e4SLinus Torvalds .err = EHOSTUNREACH, 10571da177e4SLinus Torvalds .fatal = 0, 10581da177e4SLinus Torvalds }, 10591da177e4SLinus Torvalds { /* ADDR_UNREACH */ 10601da177e4SLinus Torvalds .err = EHOSTUNREACH, 10611da177e4SLinus Torvalds .fatal = 0, 10621da177e4SLinus Torvalds }, 10631da177e4SLinus Torvalds { /* PORT_UNREACH */ 10641da177e4SLinus Torvalds .err = ECONNREFUSED, 10651da177e4SLinus Torvalds .fatal = 1, 10661da177e4SLinus Torvalds }, 106761e76b17SJiri Bohac { /* POLICY_FAIL */ 106861e76b17SJiri Bohac .err = EACCES, 106961e76b17SJiri Bohac .fatal = 1, 107061e76b17SJiri Bohac }, 107161e76b17SJiri Bohac { /* REJECT_ROUTE */ 107261e76b17SJiri Bohac .err = EACCES, 107361e76b17SJiri Bohac .fatal = 1, 107461e76b17SJiri Bohac }, 10751da177e4SLinus Torvalds }; 10761da177e4SLinus Torvalds 1077d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 10781da177e4SLinus Torvalds { 10791da177e4SLinus Torvalds int fatal = 0; 10801da177e4SLinus Torvalds 10811da177e4SLinus Torvalds *err = EPROTO; 10821da177e4SLinus Torvalds 10831da177e4SLinus Torvalds switch (type) { 10841da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 10851da177e4SLinus Torvalds fatal = 1; 108661e76b17SJiri Bohac if (code < ARRAY_SIZE(tab_unreach)) { 10871da177e4SLinus Torvalds *err = tab_unreach[code].err; 10881da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 10891da177e4SLinus Torvalds } 10901da177e4SLinus Torvalds break; 10911da177e4SLinus Torvalds 10921da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 10931da177e4SLinus Torvalds *err = EMSGSIZE; 10941da177e4SLinus Torvalds break; 10951da177e4SLinus Torvalds 10961da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 10971da177e4SLinus Torvalds *err = EPROTO; 10981da177e4SLinus Torvalds fatal = 1; 10991da177e4SLinus Torvalds break; 11001da177e4SLinus Torvalds 11011da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 11021da177e4SLinus Torvalds *err = EHOSTUNREACH; 11031da177e4SLinus Torvalds break; 11043ff50b79SStephen Hemminger } 11051da177e4SLinus Torvalds 11061da177e4SLinus Torvalds return fatal; 11071da177e4SLinus Torvalds } 11087159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 11097159039aSYOSHIFUJI Hideaki 11101da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 1111e8243534Sstephen hemminger static struct ctl_table ipv6_icmp_table_template[] = { 11121da177e4SLinus Torvalds { 11131da177e4SLinus Torvalds .procname = "ratelimit", 111441a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 11151da177e4SLinus Torvalds .maxlen = sizeof(int), 11161da177e4SLinus Torvalds .mode = 0644, 11176d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 11181da177e4SLinus Torvalds }, 1119e6f86b0fSVirgile Jarry { 1120e6f86b0fSVirgile Jarry .procname = "echo_ignore_all", 1121e6f86b0fSVirgile Jarry .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_all, 1122e6f86b0fSVirgile Jarry .maxlen = sizeof(int), 1123e6f86b0fSVirgile Jarry .mode = 0644, 1124e6f86b0fSVirgile Jarry .proc_handler = proc_dointvec, 1125e6f86b0fSVirgile Jarry }, 112603f1ecccSStephen Suryaputra { 112703f1ecccSStephen Suryaputra .procname = "echo_ignore_multicast", 112803f1ecccSStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_multicast, 112903f1ecccSStephen Suryaputra .maxlen = sizeof(int), 113003f1ecccSStephen Suryaputra .mode = 0644, 113103f1ecccSStephen Suryaputra .proc_handler = proc_dointvec, 113203f1ecccSStephen Suryaputra }, 11330b03a5caSStephen Suryaputra { 11340b03a5caSStephen Suryaputra .procname = "echo_ignore_anycast", 11350b03a5caSStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_anycast, 11360b03a5caSStephen Suryaputra .maxlen = sizeof(int), 11370b03a5caSStephen Suryaputra .mode = 0644, 11380b03a5caSStephen Suryaputra .proc_handler = proc_dointvec, 11390b03a5caSStephen Suryaputra }, 1140f8572d8fSEric W. Biederman { }, 11411da177e4SLinus Torvalds }; 1142760f2d01SDaniel Lezcano 11432c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 1144760f2d01SDaniel Lezcano { 1145760f2d01SDaniel Lezcano struct ctl_table *table; 1146760f2d01SDaniel Lezcano 1147760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 1148760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 1149760f2d01SDaniel Lezcano GFP_KERNEL); 11505ee09105SYOSHIFUJI Hideaki 1151e6f86b0fSVirgile Jarry if (table) { 11525ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 1153e6f86b0fSVirgile Jarry table[1].data = &net->ipv6.sysctl.icmpv6_echo_ignore_all; 115403f1ecccSStephen Suryaputra table[2].data = &net->ipv6.sysctl.icmpv6_echo_ignore_multicast; 11550b03a5caSStephen Suryaputra table[3].data = &net->ipv6.sysctl.icmpv6_echo_ignore_anycast; 1156e6f86b0fSVirgile Jarry } 1157760f2d01SDaniel Lezcano return table; 1158760f2d01SDaniel Lezcano } 11591da177e4SLinus Torvalds #endif 1160