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); 1612efdaaafSHangbin Liu 1622efdaaafSHangbin Liu /* Based on RFC 8200, Section 4.5 Fragment Header, return 1632efdaaafSHangbin Liu * false if this is a fragment packet with no icmp header info. 1642efdaaafSHangbin Liu */ 1652efdaaafSHangbin Liu if (!tp && frag_off != 0) 1662efdaaafSHangbin Liu return false; 1672efdaaafSHangbin Liu else if (!tp || !(*tp & ICMPV6_INFOMSG_MASK)) 168a50feda5SEric Dumazet return true; 1691da177e4SLinus Torvalds } 170a50feda5SEric Dumazet return false; 1711da177e4SLinus Torvalds } 1721da177e4SLinus Torvalds 1730bc19985SStephen Suryaputra static bool icmpv6_mask_allow(struct net *net, int type) 174c0303efeSJesper Dangaard Brouer { 1750bc19985SStephen Suryaputra if (type > ICMPV6_MSG_MAX) 176c0303efeSJesper Dangaard Brouer return true; 177c0303efeSJesper Dangaard Brouer 1780bc19985SStephen Suryaputra /* Limit if icmp type is set in ratemask. */ 1790bc19985SStephen Suryaputra if (!test_bit(type, net->ipv6.sysctl.icmpv6_ratemask)) 180c0303efeSJesper Dangaard Brouer return true; 181c0303efeSJesper Dangaard Brouer 182c0303efeSJesper Dangaard Brouer return false; 183c0303efeSJesper Dangaard Brouer } 184c0303efeSJesper Dangaard Brouer 1850bc19985SStephen Suryaputra static bool icmpv6_global_allow(struct net *net, int type) 186c0303efeSJesper Dangaard Brouer { 1870bc19985SStephen Suryaputra if (icmpv6_mask_allow(net, type)) 188c0303efeSJesper Dangaard Brouer return true; 189c0303efeSJesper Dangaard Brouer 190c0303efeSJesper Dangaard Brouer if (icmp_global_allow()) 191c0303efeSJesper Dangaard Brouer return true; 192c0303efeSJesper Dangaard Brouer 193c0303efeSJesper Dangaard Brouer return false; 194c0303efeSJesper Dangaard Brouer } 195c0303efeSJesper Dangaard Brouer 1961da177e4SLinus Torvalds /* 1971da177e4SLinus Torvalds * Check the ICMP output rate limit 1981da177e4SLinus Torvalds */ 1994cdf507dSEric Dumazet static bool icmpv6_xrlim_allow(struct sock *sk, u8 type, 2004c9483b2SDavid S. Miller struct flowi6 *fl6) 2011da177e4SLinus Torvalds { 2023b1e0a65SYOSHIFUJI Hideaki struct net *net = sock_net(sk); 2034cdf507dSEric Dumazet struct dst_entry *dst; 20492d86829SDavid S. Miller bool res = false; 2051da177e4SLinus Torvalds 2060bc19985SStephen Suryaputra if (icmpv6_mask_allow(net, type)) 20792d86829SDavid S. Miller return true; 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds /* 2101da177e4SLinus Torvalds * Look up the output route. 2111da177e4SLinus Torvalds * XXX: perhaps the expire for routing entries cloned by 2121da177e4SLinus Torvalds * this lookup should be more aggressive (not longer than timeout). 2131da177e4SLinus Torvalds */ 2144c9483b2SDavid S. Miller dst = ip6_route_output(net, sk, fl6); 2151da177e4SLinus Torvalds if (dst->error) { 2163bd653c8SDenis V. Lunev IP6_INC_STATS(net, ip6_dst_idev(dst), 217a11d206dSYOSHIFUJI Hideaki IPSTATS_MIB_OUTNOROUTES); 2181da177e4SLinus Torvalds } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { 21992d86829SDavid S. Miller res = true; 2201da177e4SLinus Torvalds } else { 2211da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 2229a43b709SBenjamin Thery int tmo = net->ipv6.sysctl.icmpv6_time; 223c0303efeSJesper Dangaard Brouer struct inet_peer *peer; 2241da177e4SLinus Torvalds 2251da177e4SLinus Torvalds /* Give more bandwidth to wider prefixes. */ 2261da177e4SLinus Torvalds if (rt->rt6i_dst.plen < 128) 2271da177e4SLinus Torvalds tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 2281da177e4SLinus Torvalds 229c0303efeSJesper Dangaard Brouer peer = inet_getpeer_v6(net->ipv6.peers, &fl6->daddr, 1); 230fbfe95a4SDavid S. Miller res = inet_peer_xrlim_allow(peer, tmo); 2311d861aa4SDavid S. Miller if (peer) 2321d861aa4SDavid S. Miller inet_putpeer(peer); 2331da177e4SLinus Torvalds } 2341da177e4SLinus Torvalds dst_release(dst); 2351da177e4SLinus Torvalds return res; 2361da177e4SLinus Torvalds } 2371da177e4SLinus Torvalds 238b93cfb9cSTim Stallard static bool icmpv6_rt_has_prefsrc(struct sock *sk, u8 type, 239b93cfb9cSTim Stallard struct flowi6 *fl6) 240b93cfb9cSTim Stallard { 241b93cfb9cSTim Stallard struct net *net = sock_net(sk); 242b93cfb9cSTim Stallard struct dst_entry *dst; 243b93cfb9cSTim Stallard bool res = false; 244b93cfb9cSTim Stallard 245b93cfb9cSTim Stallard dst = ip6_route_output(net, sk, fl6); 246b93cfb9cSTim Stallard if (!dst->error) { 247b93cfb9cSTim Stallard struct rt6_info *rt = (struct rt6_info *)dst; 248b93cfb9cSTim Stallard struct in6_addr prefsrc; 249b93cfb9cSTim Stallard 250b93cfb9cSTim Stallard rt6_get_prefsrc(rt, &prefsrc); 251b93cfb9cSTim Stallard res = !ipv6_addr_any(&prefsrc); 252b93cfb9cSTim Stallard } 253b93cfb9cSTim Stallard dst_release(dst); 254b93cfb9cSTim Stallard return res; 255b93cfb9cSTim Stallard } 256b93cfb9cSTim Stallard 2571da177e4SLinus Torvalds /* 2581da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2591da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2601da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2611da177e4SLinus Torvalds * highest-order two bits set to 10 2621da177e4SLinus Torvalds */ 2631da177e4SLinus Torvalds 264a50feda5SEric Dumazet static bool opt_unrec(struct sk_buff *skb, __u32 offset) 2651da177e4SLinus Torvalds { 2661da177e4SLinus Torvalds u8 _optval, *op; 2671da177e4SLinus Torvalds 268bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2691da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 27063159f29SIan Morris if (!op) 271a50feda5SEric Dumazet return true; 2721da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2731da177e4SLinus Torvalds } 2741da177e4SLinus Torvalds 2754e64b1edSJoe Perches void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 2766d0bfe22SLorenzo Colitti struct icmp6hdr *thdr, int len) 2771da177e4SLinus Torvalds { 2781da177e4SLinus Torvalds struct sk_buff *skb; 2791da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2801da177e4SLinus Torvalds 281e5d08d71SIan Morris skb = skb_peek(&sk->sk_write_queue); 28263159f29SIan Morris if (!skb) 2834e64b1edSJoe Perches return; 2841da177e4SLinus Torvalds 285cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2861da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2871da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 29007f0757aSJoe Perches skb->csum = csum_partial(icmp6h, 2911da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2924c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2934c9483b2SDavid S. Miller &fl6->daddr, 2944c9483b2SDavid S. Miller len, fl6->flowi6_proto, 2951da177e4SLinus Torvalds skb->csum); 2961da177e4SLinus Torvalds } else { 297868c86bcSAl Viro __wsum tmp_csum = 0; 2981da177e4SLinus Torvalds 2991da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 3001da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 3011da177e4SLinus Torvalds } 3021da177e4SLinus Torvalds 30307f0757aSJoe Perches tmp_csum = csum_partial(icmp6h, 3041da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 3054c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 3064c9483b2SDavid S. Miller &fl6->daddr, 3074c9483b2SDavid S. Miller len, fl6->flowi6_proto, 308868c86bcSAl Viro tmp_csum); 3091da177e4SLinus Torvalds } 3101da177e4SLinus Torvalds ip6_push_pending_frames(sk); 3111da177e4SLinus Torvalds } 3121da177e4SLinus Torvalds 3131da177e4SLinus Torvalds struct icmpv6_msg { 3141da177e4SLinus Torvalds struct sk_buff *skb; 3151da177e4SLinus Torvalds int offset; 316763ecff1SYasuyuki Kozakai uint8_t type; 3171da177e4SLinus Torvalds }; 3181da177e4SLinus Torvalds 3191da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 3201da177e4SLinus Torvalds { 3211da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 3221da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 3238d5930dfSAl Viro __wsum csum; 3241da177e4SLinus Torvalds 3251da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 3268d5930dfSAl Viro to, len); 3271da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 328763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 329763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 3301da177e4SLinus Torvalds return 0; 3311da177e4SLinus Torvalds } 3321da177e4SLinus Torvalds 33307a93626SAmerigo Wang #if IS_ENABLED(CONFIG_IPV6_MIP6) 334ee576c47SJason A. Donenfeld static void mip6_addr_swap(struct sk_buff *skb, const struct inet6_skb_parm *opt) 33579383236SMasahide NAKAMURA { 3360660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 33779383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 33879383236SMasahide NAKAMURA struct in6_addr tmp; 33979383236SMasahide NAKAMURA int off; 34079383236SMasahide NAKAMURA 34179383236SMasahide NAKAMURA if (opt->dsthao) { 34279383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 34379383236SMasahide NAKAMURA if (likely(off >= 0)) { 344d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 345d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 3464e3fd7a0SAlexey Dobriyan tmp = iph->saddr; 3474e3fd7a0SAlexey Dobriyan iph->saddr = hao->addr; 3484e3fd7a0SAlexey Dobriyan hao->addr = tmp; 34979383236SMasahide NAKAMURA } 35079383236SMasahide NAKAMURA } 35179383236SMasahide NAKAMURA } 35279383236SMasahide NAKAMURA #else 353ee576c47SJason A. Donenfeld static inline void mip6_addr_swap(struct sk_buff *skb, const struct inet6_skb_parm *opt) {} 35479383236SMasahide NAKAMURA #endif 35579383236SMasahide NAKAMURA 356e8243534Sstephen hemminger static struct dst_entry *icmpv6_route_lookup(struct net *net, 357e8243534Sstephen hemminger struct sk_buff *skb, 358e8243534Sstephen hemminger struct sock *sk, 359e8243534Sstephen hemminger struct flowi6 *fl6) 360b42835dbSDavid S. Miller { 361b42835dbSDavid S. Miller struct dst_entry *dst, *dst2; 3624c9483b2SDavid S. Miller struct flowi6 fl2; 363b42835dbSDavid S. Miller int err; 364b42835dbSDavid S. Miller 365343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst, fl6); 366b42835dbSDavid S. Miller if (err) 367b42835dbSDavid S. Miller return ERR_PTR(err); 368b42835dbSDavid S. Miller 369b42835dbSDavid S. Miller /* 370b42835dbSDavid S. Miller * We won't send icmp if the destination is known 371b42835dbSDavid S. Miller * anycast. 372b42835dbSDavid S. Miller */ 3732647a9b0SMartin KaFai Lau if (ipv6_anycast_destination(dst, &fl6->daddr)) { 374ba7a46f1SJoe Perches net_dbg_ratelimited("icmp6_send: acast source\n"); 375b42835dbSDavid S. Miller dst_release(dst); 376b42835dbSDavid S. Miller return ERR_PTR(-EINVAL); 377b42835dbSDavid S. Miller } 378b42835dbSDavid S. Miller 379b42835dbSDavid S. Miller /* No need to clone since we're just using its address. */ 380b42835dbSDavid S. Miller dst2 = dst; 381b42835dbSDavid S. Miller 3824c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); 383452edd59SDavid S. Miller if (!IS_ERR(dst)) { 384b42835dbSDavid S. Miller if (dst != dst2) 385b42835dbSDavid S. Miller return dst; 386452edd59SDavid S. Miller } else { 387452edd59SDavid S. Miller if (PTR_ERR(dst) == -EPERM) 388b42835dbSDavid S. Miller dst = NULL; 389452edd59SDavid S. Miller else 390452edd59SDavid S. Miller return dst; 391b42835dbSDavid S. Miller } 392b42835dbSDavid S. Miller 3934c9483b2SDavid S. Miller err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); 394b42835dbSDavid S. Miller if (err) 395b42835dbSDavid S. Miller goto relookup_failed; 396b42835dbSDavid S. Miller 397343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst2, &fl2); 398b42835dbSDavid S. Miller if (err) 399b42835dbSDavid S. Miller goto relookup_failed; 400b42835dbSDavid S. Miller 4014c9483b2SDavid S. Miller dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); 402452edd59SDavid S. Miller if (!IS_ERR(dst2)) { 403b42835dbSDavid S. Miller dst_release(dst); 404b42835dbSDavid S. Miller dst = dst2; 405452edd59SDavid S. Miller } else { 406452edd59SDavid S. Miller err = PTR_ERR(dst2); 407452edd59SDavid S. Miller if (err == -EPERM) { 408b42835dbSDavid S. Miller dst_release(dst); 409452edd59SDavid S. Miller return dst2; 410452edd59SDavid S. Miller } else 411b42835dbSDavid S. Miller goto relookup_failed; 412b42835dbSDavid S. Miller } 413b42835dbSDavid S. Miller 414b42835dbSDavid S. Miller relookup_failed: 415b42835dbSDavid S. Miller if (dst) 416b42835dbSDavid S. Miller return dst; 417b42835dbSDavid S. Miller return ERR_PTR(err); 418b42835dbSDavid S. Miller } 419b42835dbSDavid S. Miller 420e1ae5c2eSStephen Suryaputra static struct net_device *icmp6_dev(const struct sk_buff *skb) 4211b70d792SDavid Ahern { 422e1ae5c2eSStephen Suryaputra struct net_device *dev = skb->dev; 4231b70d792SDavid Ahern 4241b70d792SDavid Ahern /* for local traffic to local address, skb dev is the loopback 4251b70d792SDavid Ahern * device. Check if there is a dst attached to the skb and if so 42624b711edSDavid Ahern * get the real device index. Same is needed for replies to a link 42724b711edSDavid Ahern * local address on a device enslaved to an L3 master device 4281b70d792SDavid Ahern */ 429e1ae5c2eSStephen Suryaputra if (unlikely(dev->ifindex == LOOPBACK_IFINDEX || netif_is_l3_master(skb->dev))) { 4301b70d792SDavid Ahern const struct rt6_info *rt6 = skb_rt6_info(skb); 4311b70d792SDavid Ahern 4321b70d792SDavid Ahern if (rt6) 433e1ae5c2eSStephen Suryaputra dev = rt6->rt6i_idev->dev; 4341b70d792SDavid Ahern } 4351b70d792SDavid Ahern 436e1ae5c2eSStephen Suryaputra return dev; 437e1ae5c2eSStephen Suryaputra } 438e1ae5c2eSStephen Suryaputra 439e1ae5c2eSStephen Suryaputra static int icmp6_iif(const struct sk_buff *skb) 440e1ae5c2eSStephen Suryaputra { 441e1ae5c2eSStephen Suryaputra return icmp6_dev(skb)->ifindex; 4421b70d792SDavid Ahern } 4431b70d792SDavid Ahern 4441da177e4SLinus Torvalds /* 4451da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 4461da177e4SLinus Torvalds */ 447cc7a21b6SEric Dumazet void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info, 448ee576c47SJason A. Donenfeld const struct in6_addr *force_saddr, 449ee576c47SJason A. Donenfeld const struct inet6_skb_parm *parm) 4501da177e4SLinus Torvalds { 4511da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 4520660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 45384427d53SYOSHIFUJI Hideaki struct sock *sk; 4548d933670SEric Dumazet struct net *net; 45584427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 456b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 4571da177e4SLinus Torvalds struct dst_entry *dst; 4581da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 4594c9483b2SDavid S. Miller struct flowi6 fl6; 4601da177e4SLinus Torvalds struct icmpv6_msg msg; 46126879da5SWei Wang struct ipcm6_cookie ipc6; 4621da177e4SLinus Torvalds int iif = 0; 4631da177e4SLinus Torvalds int addr_type = 0; 4641da177e4SLinus Torvalds int len; 4658d933670SEric Dumazet u32 mark; 4661da177e4SLinus Torvalds 46727a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 46829a3cad5SSimon Horman (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb)) 4691da177e4SLinus Torvalds return; 4701da177e4SLinus Torvalds 4718d933670SEric Dumazet if (!skb->dev) 4728d933670SEric Dumazet return; 4738d933670SEric Dumazet net = dev_net(skb->dev); 4748d933670SEric Dumazet mark = IP6_REPLY_MARK(net, skb->mark); 4751da177e4SLinus Torvalds /* 4761da177e4SLinus Torvalds * Make sure we respect the rules 4771da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 4785f5624cfSPravin B Shelar * Rule (e.1) is enforced by not using icmp6_send 4791da177e4SLinus Torvalds * in any code that processes icmp errors. 4801da177e4SLinus Torvalds */ 4811da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 4821da177e4SLinus Torvalds 483446fab59SFX Le Bail if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) || 484d94c1f92SFX Le Bail ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr)) 4851da177e4SLinus Torvalds saddr = &hdr->daddr; 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds /* 4881da177e4SLinus Torvalds * Dest addr check 4891da177e4SLinus Torvalds */ 4901da177e4SLinus Torvalds 4919a6b4b39Szhuyj if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) { 4921da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 4931da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 4941da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 4951da177e4SLinus Torvalds (opt_unrec(skb, info)))) 4961da177e4SLinus Torvalds return; 4971da177e4SLinus Torvalds 4981da177e4SLinus Torvalds saddr = NULL; 4991da177e4SLinus Torvalds } 5001da177e4SLinus Torvalds 5011da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 5021da177e4SLinus Torvalds 5031da177e4SLinus Torvalds /* 5041da177e4SLinus Torvalds * Source addr check 5051da177e4SLinus Torvalds */ 5061da177e4SLinus Torvalds 5074832c30dSDavid Ahern if (__ipv6_addr_needs_scope_id(addr_type)) { 5081b70d792SDavid Ahern iif = icmp6_iif(skb); 5094832c30dSDavid Ahern } else { 510272928d1SMathieu Desnoyers /* 511272928d1SMathieu Desnoyers * The source device is used for looking up which routing table 512272928d1SMathieu Desnoyers * to use for sending an ICMP error. 513272928d1SMathieu Desnoyers */ 514272928d1SMathieu Desnoyers iif = l3mdev_master_ifindex(skb->dev); 51579dc7e3fSDavid Ahern } 5161da177e4SLinus Torvalds 5171da177e4SLinus Torvalds /* 5188de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 5198de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 5208de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 5218de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 5221da177e4SLinus Torvalds */ 5231da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 5244b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n", 5254b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5261da177e4SLinus Torvalds return; 5271da177e4SLinus Torvalds } 5281da177e4SLinus Torvalds 5291da177e4SLinus Torvalds /* 5301da177e4SLinus Torvalds * Never answer to a ICMP packet. 5311da177e4SLinus Torvalds */ 5321da177e4SLinus Torvalds if (is_ineligible(skb)) { 5334b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n", 5344b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5351da177e4SLinus Torvalds return; 5361da177e4SLinus Torvalds } 5371da177e4SLinus Torvalds 5387ba91ecbSJesper Dangaard Brouer /* Needed by both icmp_global_allow and icmpv6_xmit_lock */ 5397ba91ecbSJesper Dangaard Brouer local_bh_disable(); 5407ba91ecbSJesper Dangaard Brouer 5417ba91ecbSJesper Dangaard Brouer /* Check global sysctl_icmp_msgs_per_sec ratelimit */ 5420bc19985SStephen Suryaputra if (!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, type)) 5437ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 5447ba91ecbSJesper Dangaard Brouer 545ee576c47SJason A. Donenfeld mip6_addr_swap(skb, parm); 54679383236SMasahide NAKAMURA 547fac6fce9SFrancesco Ruggeri sk = icmpv6_xmit_lock(net); 548fac6fce9SFrancesco Ruggeri if (!sk) 549fac6fce9SFrancesco Ruggeri goto out_bh_enable; 550fac6fce9SFrancesco Ruggeri 5514c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 5524c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 5534e3fd7a0SAlexey Dobriyan fl6.daddr = hdr->saddr; 554b1cadc1aSEric Dumazet if (force_saddr) 555b1cadc1aSEric Dumazet saddr = force_saddr; 556fac6fce9SFrancesco Ruggeri if (saddr) { 5574e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 558b93cfb9cSTim Stallard } else if (!icmpv6_rt_has_prefsrc(sk, type, &fl6)) { 559fac6fce9SFrancesco Ruggeri /* select a more meaningful saddr from input if */ 560fac6fce9SFrancesco Ruggeri struct net_device *in_netdev; 561fac6fce9SFrancesco Ruggeri 562ee576c47SJason A. Donenfeld in_netdev = dev_get_by_index(net, parm->iif); 563fac6fce9SFrancesco Ruggeri if (in_netdev) { 564fac6fce9SFrancesco Ruggeri ipv6_dev_get_saddr(net, in_netdev, &fl6.daddr, 565fac6fce9SFrancesco Ruggeri inet6_sk(sk)->srcprefs, 566fac6fce9SFrancesco Ruggeri &fl6.saddr); 567fac6fce9SFrancesco Ruggeri dev_put(in_netdev); 568fac6fce9SFrancesco Ruggeri } 569fac6fce9SFrancesco Ruggeri } 570e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 5714c9483b2SDavid S. Miller fl6.flowi6_oif = iif; 5721958b856SDavid S. Miller fl6.fl6_icmp_type = type; 5731958b856SDavid S. Miller fl6.fl6_icmp_code = code; 574e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 575b4bac172SDavid Ahern fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, NULL); 5763df98d79SPaul Moore security_skb_classify_flow(skb, flowi6_to_flowi_common(&fl6)); 5771da177e4SLinus Torvalds 578fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 579405666dbSDenis V. Lunev 5804c9483b2SDavid S. Miller if (!icmpv6_xrlim_allow(sk, type, &fl6)) 5811da177e4SLinus Torvalds goto out; 5821da177e4SLinus Torvalds 5831da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 5841da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 5851da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 5861da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 5871da177e4SLinus Torvalds 5884c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 5894c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 590c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 591c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 5921da177e4SLinus Torvalds 593b515430aSWillem de Bruijn ipcm6_init_sk(&ipc6, np); 5940da7536fSWillem de Bruijn ipc6.sockc.mark = mark; 59538b7097bSHannes Frederic Sowa fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 59638b7097bSHannes Frederic Sowa 5974c9483b2SDavid S. Miller dst = icmpv6_route_lookup(net, skb, sk, &fl6); 598b42835dbSDavid S. Miller if (IS_ERR(dst)) 5991da177e4SLinus Torvalds goto out; 6008de3351eSYOSHIFUJI Hideaki 60126879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 6021da177e4SLinus Torvalds 6031da177e4SLinus Torvalds msg.skb = skb; 604bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 605763ecff1SYasuyuki Kozakai msg.type = type; 6061da177e4SLinus Torvalds 6071da177e4SLinus Torvalds len = skb->len - msg.offset; 6081da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); 6091da177e4SLinus Torvalds if (len < 0) { 6104b3418fbSBjørn Mork net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n", 6114b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 6121da177e4SLinus Torvalds goto out_dst_release; 6131da177e4SLinus Torvalds } 6141da177e4SLinus Torvalds 615cfdf7647SEric Dumazet rcu_read_lock(); 616cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 6171da177e4SLinus Torvalds 6184e64b1edSJoe Perches if (ip6_append_data(sk, icmpv6_getfrag, &msg, 6191da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 62026879da5SWei Wang sizeof(struct icmp6hdr), 62126879da5SWei Wang &ipc6, &fl6, (struct rt6_info *)dst, 6225fdaa88dSWillem de Bruijn MSG_DONTWAIT)) { 62343a43b60SHannes Frederic Sowa ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 6241da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 625cfdf7647SEric Dumazet } else { 6264e64b1edSJoe Perches icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 627cfdf7647SEric Dumazet len + sizeof(struct icmp6hdr)); 6281da177e4SLinus Torvalds } 629cfdf7647SEric Dumazet rcu_read_unlock(); 6301da177e4SLinus Torvalds out_dst_release: 6311da177e4SLinus Torvalds dst_release(dst); 6321da177e4SLinus Torvalds out: 633405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 6347ba91ecbSJesper Dangaard Brouer out_bh_enable: 6357ba91ecbSJesper Dangaard Brouer local_bh_enable(); 6361da177e4SLinus Torvalds } 637cc7a21b6SEric Dumazet EXPORT_SYMBOL(icmp6_send); 6385f5624cfSPravin B Shelar 6395f5624cfSPravin B Shelar /* Slightly more convenient version of icmp6_send. 6405f5624cfSPravin B Shelar */ 6415f5624cfSPravin B Shelar void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) 6425f5624cfSPravin B Shelar { 643ee576c47SJason A. Donenfeld icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL, IP6CB(skb)); 6445f5624cfSPravin B Shelar kfree_skb(skb); 6455f5624cfSPravin B Shelar } 6467159039aSYOSHIFUJI Hideaki 6475fbba8acSEric Dumazet /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH 6485fbba8acSEric Dumazet * if sufficient data bytes are available 6495fbba8acSEric Dumazet * @nhs is the size of the tunnel header(s) : 6505fbba8acSEric Dumazet * Either an IPv4 header for SIT encap 6515fbba8acSEric Dumazet * an IPv4 header + GRE header for GRE encap 6525fbba8acSEric Dumazet */ 65320e1954fSEric Dumazet int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type, 65420e1954fSEric Dumazet unsigned int data_len) 6555fbba8acSEric Dumazet { 6562d7a3b27SEric Dumazet struct in6_addr temp_saddr; 6575fbba8acSEric Dumazet struct rt6_info *rt; 6585fbba8acSEric Dumazet struct sk_buff *skb2; 65920e1954fSEric Dumazet u32 info = 0; 6605fbba8acSEric Dumazet 6615fbba8acSEric Dumazet if (!pskb_may_pull(skb, nhs + sizeof(struct ipv6hdr) + 8)) 6625fbba8acSEric Dumazet return 1; 6635fbba8acSEric Dumazet 66420e1954fSEric Dumazet /* RFC 4884 (partial) support for ICMP extensions */ 66520e1954fSEric Dumazet if (data_len < 128 || (data_len & 7) || skb->len < data_len) 66620e1954fSEric Dumazet data_len = 0; 66720e1954fSEric Dumazet 66820e1954fSEric Dumazet skb2 = data_len ? skb_copy(skb, GFP_ATOMIC) : skb_clone(skb, GFP_ATOMIC); 6695fbba8acSEric Dumazet 6705fbba8acSEric Dumazet if (!skb2) 6715fbba8acSEric Dumazet return 1; 6725fbba8acSEric Dumazet 6735fbba8acSEric Dumazet skb_dst_drop(skb2); 6745fbba8acSEric Dumazet skb_pull(skb2, nhs); 6755fbba8acSEric Dumazet skb_reset_network_header(skb2); 6765fbba8acSEric Dumazet 677b75cc8f9SDavid Ahern rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 678b75cc8f9SDavid Ahern skb, 0); 6795fbba8acSEric Dumazet 6805fbba8acSEric Dumazet if (rt && rt->dst.dev) 6815fbba8acSEric Dumazet skb2->dev = rt->dst.dev; 6825fbba8acSEric Dumazet 6832d7a3b27SEric Dumazet ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr); 68420e1954fSEric Dumazet 68520e1954fSEric Dumazet if (data_len) { 68620e1954fSEric Dumazet /* RFC 4884 (partial) support : 68720e1954fSEric Dumazet * insert 0 padding at the end, before the extensions 68820e1954fSEric Dumazet */ 68920e1954fSEric Dumazet __skb_push(skb2, nhs); 69020e1954fSEric Dumazet skb_reset_network_header(skb2); 69120e1954fSEric Dumazet memmove(skb2->data, skb2->data + nhs, data_len - nhs); 69220e1954fSEric Dumazet memset(skb2->data + data_len - nhs, 0, nhs); 69320e1954fSEric Dumazet /* RFC 4884 4.5 : Length is measured in 64-bit words, 69420e1954fSEric Dumazet * and stored in reserved[0] 69520e1954fSEric Dumazet */ 69620e1954fSEric Dumazet info = (data_len/8) << 24; 69720e1954fSEric Dumazet } 6982d7a3b27SEric Dumazet if (type == ICMP_TIME_EXCEEDED) 6992d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 700ee576c47SJason A. Donenfeld info, &temp_saddr, IP6CB(skb2)); 7012d7a3b27SEric Dumazet else 7022d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 703ee576c47SJason A. Donenfeld info, &temp_saddr, IP6CB(skb2)); 7045fbba8acSEric Dumazet if (rt) 7055fbba8acSEric Dumazet ip6_rt_put(rt); 7065fbba8acSEric Dumazet 7075fbba8acSEric Dumazet kfree_skb(skb2); 7085fbba8acSEric Dumazet 7095fbba8acSEric Dumazet return 0; 7105fbba8acSEric Dumazet } 7115fbba8acSEric Dumazet EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach); 7125fbba8acSEric Dumazet 7131da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 7141da177e4SLinus Torvalds { 715c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 71684427d53SYOSHIFUJI Hideaki struct sock *sk; 7171da177e4SLinus Torvalds struct inet6_dev *idev; 71884427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 719b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 720cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 7211da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 7224c9483b2SDavid S. Miller struct flowi6 fl6; 7231da177e4SLinus Torvalds struct icmpv6_msg msg; 7241da177e4SLinus Torvalds struct dst_entry *dst; 72526879da5SWei Wang struct ipcm6_cookie ipc6; 726e110861fSLorenzo Colitti u32 mark = IP6_REPLY_MARK(net, skb->mark); 7270b03a5caSStephen Suryaputra bool acast; 728*1fd07f33SAndreas Roeseler u8 type; 7291da177e4SLinus Torvalds 73003f1ecccSStephen Suryaputra if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) && 73103f1ecccSStephen Suryaputra net->ipv6.sysctl.icmpv6_echo_ignore_multicast) 73203f1ecccSStephen Suryaputra return; 73303f1ecccSStephen Suryaputra 7340660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 7351da177e4SLinus Torvalds 7360b03a5caSStephen Suryaputra acast = ipv6_anycast_destination(skb_dst(skb), saddr); 7370b03a5caSStephen Suryaputra if (acast && net->ipv6.sysctl.icmpv6_echo_ignore_anycast) 7380b03a5caSStephen Suryaputra return; 7390b03a5caSStephen Suryaputra 740509aba3bSFX Le Bail if (!ipv6_unicast_destination(skb) && 7410b03a5caSStephen Suryaputra !(net->ipv6.sysctl.anycast_src_echo_reply && acast)) 7421da177e4SLinus Torvalds saddr = NULL; 7431da177e4SLinus Torvalds 744*1fd07f33SAndreas Roeseler if (icmph->icmp6_type == ICMPV6_EXT_ECHO_REQUEST) 745*1fd07f33SAndreas Roeseler type = ICMPV6_EXT_ECHO_REPLY; 746*1fd07f33SAndreas Roeseler else 747*1fd07f33SAndreas Roeseler type = ICMPV6_ECHO_REPLY; 748*1fd07f33SAndreas Roeseler 7491da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 750*1fd07f33SAndreas Roeseler tmp_hdr.icmp6_type = type; 7511da177e4SLinus Torvalds 7524c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 753a346abe0SEric Dumazet if (net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES) 754a346abe0SEric Dumazet fl6.flowlabel = ip6_flowlabel(ipv6_hdr(skb)); 755a346abe0SEric Dumazet 7564c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 7574e3fd7a0SAlexey Dobriyan fl6.daddr = ipv6_hdr(skb)->saddr; 7581da177e4SLinus Torvalds if (saddr) 7594e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 7601b70d792SDavid Ahern fl6.flowi6_oif = icmp6_iif(skb); 761*1fd07f33SAndreas Roeseler fl6.fl6_icmp_type = type; 762e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 763e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 7643df98d79SPaul Moore security_skb_classify_flow(skb, flowi6_to_flowi_common(&fl6)); 7651da177e4SLinus Torvalds 7667ba91ecbSJesper Dangaard Brouer local_bh_disable(); 767fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 76863159f29SIan Morris if (!sk) 7697ba91ecbSJesper Dangaard Brouer goto out_bh_enable; 770fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 771405666dbSDenis V. Lunev 7724c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 7734c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 774c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 775c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 7761da177e4SLinus Torvalds 7774e64b1edSJoe Perches if (ip6_dst_lookup(net, sk, &dst, &fl6)) 7781da177e4SLinus Torvalds goto out; 7794c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); 780452edd59SDavid S. Miller if (IS_ERR(dst)) 781e104411bSPatrick McHardy goto out; 7821da177e4SLinus Torvalds 7830bc19985SStephen Suryaputra /* Check the ratelimit */ 7840bc19985SStephen Suryaputra if ((!(skb->dev->flags & IFF_LOOPBACK) && !icmpv6_global_allow(net, ICMPV6_ECHO_REPLY)) || 7850bc19985SStephen Suryaputra !icmpv6_xrlim_allow(sk, ICMPV6_ECHO_REPLY, &fl6)) 7860bc19985SStephen Suryaputra goto out_dst_release; 7870bc19985SStephen Suryaputra 788cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 7891da177e4SLinus Torvalds 7901da177e4SLinus Torvalds msg.skb = skb; 7911da177e4SLinus Torvalds msg.offset = 0; 792*1fd07f33SAndreas Roeseler msg.type = type; 7931da177e4SLinus Torvalds 794b515430aSWillem de Bruijn ipcm6_init_sk(&ipc6, np); 79526879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 79626879da5SWei Wang ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 7970da7536fSWillem de Bruijn ipc6.sockc.mark = mark; 79826879da5SWei Wang 799*1fd07f33SAndreas Roeseler if (icmph->icmp6_type == ICMPV6_EXT_ECHO_REQUEST) 800*1fd07f33SAndreas Roeseler if (!icmp_build_probe(skb, (struct icmphdr *)&tmp_hdr)) 801*1fd07f33SAndreas Roeseler goto out_dst_release; 802*1fd07f33SAndreas Roeseler 8034e64b1edSJoe Perches if (ip6_append_data(sk, icmpv6_getfrag, &msg, 8044e64b1edSJoe Perches skb->len + sizeof(struct icmp6hdr), 80526879da5SWei Wang sizeof(struct icmp6hdr), &ipc6, &fl6, 8065fdaa88dSWillem de Bruijn (struct rt6_info *)dst, MSG_DONTWAIT)) { 807a16292a0SEric Dumazet __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 8081da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 809cfdf7647SEric Dumazet } else { 8104e64b1edSJoe Perches icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 811cfdf7647SEric Dumazet skb->len + sizeof(struct icmp6hdr)); 8121da177e4SLinus Torvalds } 8130bc19985SStephen Suryaputra out_dst_release: 8141da177e4SLinus Torvalds dst_release(dst); 8151da177e4SLinus Torvalds out: 816405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 8177ba91ecbSJesper Dangaard Brouer out_bh_enable: 8187ba91ecbSJesper Dangaard Brouer local_bh_enable(); 8191da177e4SLinus Torvalds } 8201da177e4SLinus Torvalds 821b94f1c09SDavid S. Miller void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 8221da177e4SLinus Torvalds { 82341135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 8241da177e4SLinus Torvalds int inner_offset; 82575f2811cSJesse Gross __be16 frag_off; 826f9242b6bSDavid S. Miller u8 nexthdr; 8277304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 8281da177e4SLinus Torvalds 8291da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 8307304fe46SDuan Jiong goto out; 8311da177e4SLinus Torvalds 8321da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 8331da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 8341da177e4SLinus Torvalds /* now skip over extension headers */ 83575f2811cSJesse Gross inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 83675f2811cSJesse Gross &nexthdr, &frag_off); 8371da177e4SLinus Torvalds if (inner_offset < 0) 8387304fe46SDuan Jiong goto out; 8391da177e4SLinus Torvalds } else { 8401da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 8411da177e4SLinus Torvalds } 8421da177e4SLinus Torvalds 8431da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 8441da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 8457304fe46SDuan Jiong goto out; 8461da177e4SLinus Torvalds 8471da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 8481da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 8491da177e4SLinus Torvalds pmtu discovery. 8501da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 8511da177e4SLinus Torvalds --ANK (980726) 8521da177e4SLinus Torvalds */ 8531da177e4SLinus Torvalds 854f9242b6bSDavid S. Miller ipprot = rcu_dereference(inet6_protos[nexthdr]); 8551da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 8561da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 8571da177e4SLinus Torvalds 85869d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 8597304fe46SDuan Jiong return; 8607304fe46SDuan Jiong 8617304fe46SDuan Jiong out: 862a16292a0SEric Dumazet __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); 8631da177e4SLinus Torvalds } 8641da177e4SLinus Torvalds 8651da177e4SLinus Torvalds /* 8661da177e4SLinus Torvalds * Handle icmp messages 8671da177e4SLinus Torvalds */ 8681da177e4SLinus Torvalds 869e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 8701da177e4SLinus Torvalds { 871e6f86b0fSVirgile Jarry struct net *net = dev_net(skb->dev); 872e1ae5c2eSStephen Suryaputra struct net_device *dev = icmp6_dev(skb); 8731da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 874b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 8751da177e4SLinus Torvalds struct icmp6hdr *hdr; 876d5fdd6baSBrian Haley u8 type; 877e3e32170SRick Jones bool success = false; 8781da177e4SLinus Torvalds 879aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 880def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 8818b7817f3SHerbert Xu int nh; 8828b7817f3SHerbert Xu 883def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 884aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 885aebcf82cSHerbert Xu goto drop_no_count; 886aebcf82cSHerbert Xu 88781aded24SDavid S. Miller if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) 8888b7817f3SHerbert Xu goto drop_no_count; 8898b7817f3SHerbert Xu 8908b7817f3SHerbert Xu nh = skb_network_offset(skb); 8918b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 8928b7817f3SHerbert Xu 8938b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 8948b7817f3SHerbert Xu goto drop_no_count; 8958b7817f3SHerbert Xu 8968b7817f3SHerbert Xu skb_set_network_header(skb, nh); 8978b7817f3SHerbert Xu } 8988b7817f3SHerbert Xu 899a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS); 9001da177e4SLinus Torvalds 9010660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 9020660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 9031da177e4SLinus Torvalds 90439471ac8STom Herbert if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { 905ba7a46f1SJoe Perches net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", 9060c6ce78aSHarvey Harrison saddr, daddr); 9076a5dc9e5SEric Dumazet goto csum_error; 9081da177e4SLinus Torvalds } 9091da177e4SLinus Torvalds 9108cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 9118cf22943SHerbert Xu goto discard_it; 9121da177e4SLinus Torvalds 913cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 9141da177e4SLinus Torvalds 9151da177e4SLinus Torvalds type = hdr->icmp6_type; 9161da177e4SLinus Torvalds 917f3832ed2SEric Dumazet ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type); 9181da177e4SLinus Torvalds 9191da177e4SLinus Torvalds switch (type) { 9201da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 921e6f86b0fSVirgile Jarry if (!net->ipv6.sysctl.icmpv6_echo_ignore_all) 9221da177e4SLinus Torvalds icmpv6_echo_reply(skb); 9231da177e4SLinus Torvalds break; 924*1fd07f33SAndreas Roeseler case ICMPV6_EXT_ECHO_REQUEST: 925*1fd07f33SAndreas Roeseler if (!net->ipv6.sysctl.icmpv6_echo_ignore_all && 926*1fd07f33SAndreas Roeseler net->ipv4.sysctl_icmp_echo_enable_probe) 927*1fd07f33SAndreas Roeseler icmpv6_echo_reply(skb); 928*1fd07f33SAndreas Roeseler break; 9291da177e4SLinus Torvalds 9301da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 931e3e32170SRick Jones success = ping_rcv(skb); 9321da177e4SLinus Torvalds break; 9331da177e4SLinus Torvalds 93431433202SAndreas Roeseler case ICMPV6_EXT_ECHO_REPLY: 93531433202SAndreas Roeseler success = ping_rcv(skb); 93631433202SAndreas Roeseler break; 93731433202SAndreas Roeseler 9381da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 9391da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 9401da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 9411da177e4SLinus Torvalds destination cache will allow to solve this problem 9421da177e4SLinus Torvalds --ANK (980726) 9431da177e4SLinus Torvalds */ 9441da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 9451da177e4SLinus Torvalds goto discard_it; 946cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 9471da177e4SLinus Torvalds 948275757e6SGustavo A. R. Silva /* to notify */ 949a8eceea8SJoe Perches fallthrough; 9501da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 9511da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 9521da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 9531da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 9541da177e4SLinus Torvalds break; 9551da177e4SLinus Torvalds 9561da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 9571da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 9581da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 9591da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 9601da177e4SLinus Torvalds case NDISC_REDIRECT: 9611da177e4SLinus Torvalds ndisc_rcv(skb); 9621da177e4SLinus Torvalds break; 9631da177e4SLinus Torvalds 9641da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 9651da177e4SLinus Torvalds igmp6_event_query(skb); 966f185de28STaehee Yoo return 0; 9671da177e4SLinus Torvalds 9681da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 9691da177e4SLinus Torvalds igmp6_event_report(skb); 970f185de28STaehee Yoo return 0; 9711da177e4SLinus Torvalds 9721da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 9731da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 9741da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 9751da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 9761da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 9771da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 9781da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 9791da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 9801da177e4SLinus Torvalds break; 9811da177e4SLinus Torvalds 9821da177e4SLinus Torvalds default: 9831da177e4SLinus Torvalds /* informational */ 9841da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 9851da177e4SLinus Torvalds break; 9861da177e4SLinus Torvalds 9874b3418fbSBjørn Mork net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n", 9884b3418fbSBjørn Mork saddr, daddr); 989ea85a0a2SDavid S. Miller 9901da177e4SLinus Torvalds /* 9911da177e4SLinus Torvalds * error of unknown type. 9921da177e4SLinus Torvalds * must pass to upper level 9931da177e4SLinus Torvalds */ 9941da177e4SLinus Torvalds 9951da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 9963ff50b79SStephen Hemminger } 9973ff50b79SStephen Hemminger 998e3e32170SRick Jones /* until the v6 path can be better sorted assume failure and 999e3e32170SRick Jones * preserve the status quo behaviour for the rest of the paths to here 1000e3e32170SRick Jones */ 1001e3e32170SRick Jones if (success) 1002e3e32170SRick Jones consume_skb(skb); 1003e3e32170SRick Jones else 10041da177e4SLinus Torvalds kfree_skb(skb); 1005e3e32170SRick Jones 10061da177e4SLinus Torvalds return 0; 10071da177e4SLinus Torvalds 10086a5dc9e5SEric Dumazet csum_error: 1009a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); 10101da177e4SLinus Torvalds discard_it: 1011a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS); 10128b7817f3SHerbert Xu drop_no_count: 10131da177e4SLinus Torvalds kfree_skb(skb); 10141da177e4SLinus Torvalds return 0; 10151da177e4SLinus Torvalds } 10161da177e4SLinus Torvalds 10174c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, 101895e41e93SYOSHIFUJI Hideaki u8 type, 101995e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 102095e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 102195e41e93SYOSHIFUJI Hideaki int oif) 102295e41e93SYOSHIFUJI Hideaki { 10234c9483b2SDavid S. Miller memset(fl6, 0, sizeof(*fl6)); 10244e3fd7a0SAlexey Dobriyan fl6->saddr = *saddr; 10254e3fd7a0SAlexey Dobriyan fl6->daddr = *daddr; 10264c9483b2SDavid S. Miller fl6->flowi6_proto = IPPROTO_ICMPV6; 10271958b856SDavid S. Miller fl6->fl6_icmp_type = type; 10281958b856SDavid S. Miller fl6->fl6_icmp_code = 0; 10294c9483b2SDavid S. Miller fl6->flowi6_oif = oif; 10303df98d79SPaul Moore security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6)); 103195e41e93SYOSHIFUJI Hideaki } 103295e41e93SYOSHIFUJI Hideaki 10333232a1efSKefeng Wang static void __net_exit icmpv6_sk_exit(struct net *net) 10343232a1efSKefeng Wang { 10353232a1efSKefeng Wang int i; 10363232a1efSKefeng Wang 10373232a1efSKefeng Wang for_each_possible_cpu(i) 103875efc250SKefeng Wang inet_ctl_sock_destroy(*per_cpu_ptr(net->ipv6.icmp_sk, i)); 103975efc250SKefeng Wang free_percpu(net->ipv6.icmp_sk); 10403232a1efSKefeng Wang } 10413232a1efSKefeng Wang 104298c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 10431da177e4SLinus Torvalds { 10441da177e4SLinus Torvalds struct sock *sk; 10453232a1efSKefeng Wang int err, i; 10461da177e4SLinus Torvalds 104775efc250SKefeng Wang net->ipv6.icmp_sk = alloc_percpu(struct sock *); 104863159f29SIan Morris if (!net->ipv6.icmp_sk) 104979c91159SDenis V. Lunev return -ENOMEM; 105079c91159SDenis V. Lunev 10516f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 10521ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 10531ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 10541da177e4SLinus Torvalds if (err < 0) { 1055f3213831SJoe Perches pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", 10561da177e4SLinus Torvalds err); 10571da177e4SLinus Torvalds goto fail; 10581da177e4SLinus Torvalds } 10591da177e4SLinus Torvalds 106075efc250SKefeng Wang *per_cpu_ptr(net->ipv6.icmp_sk, i) = sk; 10615c8cafd6SDenis V. Lunev 10621da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 10631da177e4SLinus Torvalds * sk_buff struct overhead. 10641da177e4SLinus Torvalds */ 106587fb4b7bSEric Dumazet sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); 10661da177e4SLinus Torvalds } 10671da177e4SLinus Torvalds return 0; 10681da177e4SLinus Torvalds 10691da177e4SLinus Torvalds fail: 10703232a1efSKefeng Wang icmpv6_sk_exit(net); 10711da177e4SLinus Torvalds return err; 10721da177e4SLinus Torvalds } 10731da177e4SLinus Torvalds 10748ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 107598c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 107698c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 107798c6d1b2SDenis V. Lunev }; 107898c6d1b2SDenis V. Lunev 107998c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 108098c6d1b2SDenis V. Lunev { 108198c6d1b2SDenis V. Lunev int err; 108298c6d1b2SDenis V. Lunev 108398c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 108498c6d1b2SDenis V. Lunev if (err < 0) 108598c6d1b2SDenis V. Lunev return err; 108698c6d1b2SDenis V. Lunev 108798c6d1b2SDenis V. Lunev err = -EAGAIN; 108898c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 108998c6d1b2SDenis V. Lunev goto fail; 10905f5624cfSPravin B Shelar 10915f5624cfSPravin B Shelar err = inet6_register_icmp_sender(icmp6_send); 10925f5624cfSPravin B Shelar if (err) 10935f5624cfSPravin B Shelar goto sender_reg_err; 109498c6d1b2SDenis V. Lunev return 0; 109598c6d1b2SDenis V. Lunev 10965f5624cfSPravin B Shelar sender_reg_err: 10975f5624cfSPravin B Shelar inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 109898c6d1b2SDenis V. Lunev fail: 1099f3213831SJoe Perches pr_err("Failed to register ICMP6 protocol\n"); 110098c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 110198c6d1b2SDenis V. Lunev return err; 110298c6d1b2SDenis V. Lunev } 110398c6d1b2SDenis V. Lunev 11048ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 110598c6d1b2SDenis V. Lunev { 11065f5624cfSPravin B Shelar inet6_unregister_icmp_sender(icmp6_send); 110798c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 11081da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 11091da177e4SLinus Torvalds } 11101da177e4SLinus Torvalds 111198c6d1b2SDenis V. Lunev 11129b5b5cffSArjan van de Ven static const struct icmp6_err { 11131da177e4SLinus Torvalds int err; 11141da177e4SLinus Torvalds int fatal; 11151da177e4SLinus Torvalds } tab_unreach[] = { 11161da177e4SLinus Torvalds { /* NOROUTE */ 11171da177e4SLinus Torvalds .err = ENETUNREACH, 11181da177e4SLinus Torvalds .fatal = 0, 11191da177e4SLinus Torvalds }, 11201da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 11211da177e4SLinus Torvalds .err = EACCES, 11221da177e4SLinus Torvalds .fatal = 1, 11231da177e4SLinus Torvalds }, 11241da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 11251da177e4SLinus Torvalds .err = EHOSTUNREACH, 11261da177e4SLinus Torvalds .fatal = 0, 11271da177e4SLinus Torvalds }, 11281da177e4SLinus Torvalds { /* ADDR_UNREACH */ 11291da177e4SLinus Torvalds .err = EHOSTUNREACH, 11301da177e4SLinus Torvalds .fatal = 0, 11311da177e4SLinus Torvalds }, 11321da177e4SLinus Torvalds { /* PORT_UNREACH */ 11331da177e4SLinus Torvalds .err = ECONNREFUSED, 11341da177e4SLinus Torvalds .fatal = 1, 11351da177e4SLinus Torvalds }, 113661e76b17SJiri Bohac { /* POLICY_FAIL */ 113761e76b17SJiri Bohac .err = EACCES, 113861e76b17SJiri Bohac .fatal = 1, 113961e76b17SJiri Bohac }, 114061e76b17SJiri Bohac { /* REJECT_ROUTE */ 114161e76b17SJiri Bohac .err = EACCES, 114261e76b17SJiri Bohac .fatal = 1, 114361e76b17SJiri Bohac }, 11441da177e4SLinus Torvalds }; 11451da177e4SLinus Torvalds 1146d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 11471da177e4SLinus Torvalds { 11481da177e4SLinus Torvalds int fatal = 0; 11491da177e4SLinus Torvalds 11501da177e4SLinus Torvalds *err = EPROTO; 11511da177e4SLinus Torvalds 11521da177e4SLinus Torvalds switch (type) { 11531da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 11541da177e4SLinus Torvalds fatal = 1; 115561e76b17SJiri Bohac if (code < ARRAY_SIZE(tab_unreach)) { 11561da177e4SLinus Torvalds *err = tab_unreach[code].err; 11571da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 11581da177e4SLinus Torvalds } 11591da177e4SLinus Torvalds break; 11601da177e4SLinus Torvalds 11611da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 11621da177e4SLinus Torvalds *err = EMSGSIZE; 11631da177e4SLinus Torvalds break; 11641da177e4SLinus Torvalds 11651da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 11661da177e4SLinus Torvalds *err = EPROTO; 11671da177e4SLinus Torvalds fatal = 1; 11681da177e4SLinus Torvalds break; 11691da177e4SLinus Torvalds 11701da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 11711da177e4SLinus Torvalds *err = EHOSTUNREACH; 11721da177e4SLinus Torvalds break; 11733ff50b79SStephen Hemminger } 11741da177e4SLinus Torvalds 11751da177e4SLinus Torvalds return fatal; 11761da177e4SLinus Torvalds } 11777159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 11787159039aSYOSHIFUJI Hideaki 11791da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 1180e8243534Sstephen hemminger static struct ctl_table ipv6_icmp_table_template[] = { 11811da177e4SLinus Torvalds { 11821da177e4SLinus Torvalds .procname = "ratelimit", 118341a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 11841da177e4SLinus Torvalds .maxlen = sizeof(int), 11851da177e4SLinus Torvalds .mode = 0644, 11866d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 11871da177e4SLinus Torvalds }, 1188e6f86b0fSVirgile Jarry { 1189e6f86b0fSVirgile Jarry .procname = "echo_ignore_all", 1190e6f86b0fSVirgile Jarry .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_all, 1191a6175633SEric Dumazet .maxlen = sizeof(u8), 1192e6f86b0fSVirgile Jarry .mode = 0644, 1193a6175633SEric Dumazet .proc_handler = proc_dou8vec_minmax, 1194e6f86b0fSVirgile Jarry }, 119503f1ecccSStephen Suryaputra { 119603f1ecccSStephen Suryaputra .procname = "echo_ignore_multicast", 119703f1ecccSStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_multicast, 1198a6175633SEric Dumazet .maxlen = sizeof(u8), 119903f1ecccSStephen Suryaputra .mode = 0644, 1200a6175633SEric Dumazet .proc_handler = proc_dou8vec_minmax, 120103f1ecccSStephen Suryaputra }, 12020b03a5caSStephen Suryaputra { 12030b03a5caSStephen Suryaputra .procname = "echo_ignore_anycast", 12040b03a5caSStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_anycast, 1205a6175633SEric Dumazet .maxlen = sizeof(u8), 12060b03a5caSStephen Suryaputra .mode = 0644, 1207a6175633SEric Dumazet .proc_handler = proc_dou8vec_minmax, 12080b03a5caSStephen Suryaputra }, 12090bc19985SStephen Suryaputra { 12100bc19985SStephen Suryaputra .procname = "ratemask", 12110bc19985SStephen Suryaputra .data = &init_net.ipv6.sysctl.icmpv6_ratemask_ptr, 12120bc19985SStephen Suryaputra .maxlen = ICMPV6_MSG_MAX + 1, 12130bc19985SStephen Suryaputra .mode = 0644, 12140bc19985SStephen Suryaputra .proc_handler = proc_do_large_bitmap, 12150bc19985SStephen Suryaputra }, 1216f8572d8fSEric W. Biederman { }, 12171da177e4SLinus Torvalds }; 1218760f2d01SDaniel Lezcano 12192c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 1220760f2d01SDaniel Lezcano { 1221760f2d01SDaniel Lezcano struct ctl_table *table; 1222760f2d01SDaniel Lezcano 1223760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 1224760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 1225760f2d01SDaniel Lezcano GFP_KERNEL); 12265ee09105SYOSHIFUJI Hideaki 1227e6f86b0fSVirgile Jarry if (table) { 12285ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 1229e6f86b0fSVirgile Jarry table[1].data = &net->ipv6.sysctl.icmpv6_echo_ignore_all; 123003f1ecccSStephen Suryaputra table[2].data = &net->ipv6.sysctl.icmpv6_echo_ignore_multicast; 12310b03a5caSStephen Suryaputra table[3].data = &net->ipv6.sysctl.icmpv6_echo_ignore_anycast; 12320bc19985SStephen Suryaputra table[4].data = &net->ipv6.sysctl.icmpv6_ratemask_ptr; 1233e6f86b0fSVirgile Jarry } 1234760f2d01SDaniel Lezcano return table; 1235760f2d01SDaniel Lezcano } 12361da177e4SLinus Torvalds #endif 1237