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 321da177e4SLinus Torvalds #include <linux/module.h> 331da177e4SLinus Torvalds #include <linux/errno.h> 341da177e4SLinus Torvalds #include <linux/types.h> 351da177e4SLinus Torvalds #include <linux/socket.h> 361da177e4SLinus Torvalds #include <linux/in.h> 371da177e4SLinus Torvalds #include <linux/kernel.h> 381da177e4SLinus Torvalds #include <linux/sockios.h> 391da177e4SLinus Torvalds #include <linux/net.h> 401da177e4SLinus Torvalds #include <linux/skbuff.h> 411da177e4SLinus Torvalds #include <linux/init.h> 42763ecff1SYasuyuki Kozakai #include <linux/netfilter.h> 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 451da177e4SLinus Torvalds #include <linux/sysctl.h> 461da177e4SLinus Torvalds #endif 471da177e4SLinus Torvalds 481da177e4SLinus Torvalds #include <linux/inet.h> 491da177e4SLinus Torvalds #include <linux/netdevice.h> 501da177e4SLinus Torvalds #include <linux/icmpv6.h> 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds #include <net/ip.h> 531da177e4SLinus Torvalds #include <net/sock.h> 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds #include <net/ipv6.h> 561da177e4SLinus Torvalds #include <net/ip6_checksum.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> 661da177e4SLinus Torvalds 671da177e4SLinus Torvalds #include <asm/uaccess.h> 681da177e4SLinus Torvalds #include <asm/system.h> 691da177e4SLinus Torvalds 701da177e4SLinus Torvalds /* 711da177e4SLinus Torvalds * The ICMP socket(s). This is the most convenient way to flow control 721da177e4SLinus Torvalds * our ICMP output as well as maintain a clean interface throughout 731da177e4SLinus Torvalds * all layers. All Socketless IP sends will soon be gone. 741da177e4SLinus Torvalds * 751da177e4SLinus Torvalds * On SMP we have one ICMP socket per-cpu. 761da177e4SLinus Torvalds */ 7798c6d1b2SDenis V. Lunev static inline struct sock *icmpv6_sk(struct net *net) 7898c6d1b2SDenis V. Lunev { 7998c6d1b2SDenis V. Lunev return net->ipv6.icmp_sk[smp_processor_id()]; 8098c6d1b2SDenis V. Lunev } 811da177e4SLinus Torvalds 82e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb); 831da177e4SLinus Torvalds 8441135cc8SAlexey Dobriyan static const struct inet6_protocol icmpv6_protocol = { 851da177e4SLinus Torvalds .handler = icmpv6_rcv, 868b7817f3SHerbert Xu .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 871da177e4SLinus Torvalds }; 881da177e4SLinus Torvalds 89fdc0bde9SDenis V. Lunev static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) 901da177e4SLinus Torvalds { 91fdc0bde9SDenis V. Lunev struct sock *sk; 92fdc0bde9SDenis V. Lunev 931da177e4SLinus Torvalds local_bh_disable(); 941da177e4SLinus Torvalds 95fdc0bde9SDenis V. Lunev sk = icmpv6_sk(net); 96405666dbSDenis V. Lunev if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { 971da177e4SLinus Torvalds /* This can happen if the output path (f.e. SIT or 981da177e4SLinus Torvalds * ip6ip6 tunnel) signals dst_link_failure() for an 991da177e4SLinus Torvalds * outgoing ICMP6 packet. 1001da177e4SLinus Torvalds */ 1011da177e4SLinus Torvalds local_bh_enable(); 102fdc0bde9SDenis V. Lunev return NULL; 1031da177e4SLinus Torvalds } 104fdc0bde9SDenis V. Lunev return sk; 1051da177e4SLinus Torvalds } 1061da177e4SLinus Torvalds 107405666dbSDenis V. Lunev static __inline__ void icmpv6_xmit_unlock(struct sock *sk) 1081da177e4SLinus Torvalds { 109405666dbSDenis V. Lunev spin_unlock_bh(&sk->sk_lock.slock); 1101da177e4SLinus Torvalds } 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds /* 1131da177e4SLinus Torvalds * Slightly more convenient version of icmpv6_send. 1141da177e4SLinus Torvalds */ 115d5fdd6baSBrian Haley void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) 1161da177e4SLinus Torvalds { 1173ffe533cSAlexey Dobriyan icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos); 1181da177e4SLinus Torvalds kfree_skb(skb); 1191da177e4SLinus Torvalds } 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds /* 1221da177e4SLinus Torvalds * Figure out, may we reply to this packet with icmp error. 1231da177e4SLinus Torvalds * 1241da177e4SLinus Torvalds * We do not reply, if: 1251da177e4SLinus Torvalds * - it was icmp error message. 1261da177e4SLinus Torvalds * - it is truncated, so that it is known, that protocol is ICMPV6 1271da177e4SLinus Torvalds * (i.e. in the middle of some exthdr) 1281da177e4SLinus Torvalds * 1291da177e4SLinus Torvalds * --ANK (980726) 1301da177e4SLinus Torvalds */ 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds static int is_ineligible(struct sk_buff *skb) 1331da177e4SLinus Torvalds { 1340660e03fSArnaldo Carvalho de Melo int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; 1351da177e4SLinus Torvalds int len = skb->len - ptr; 1360660e03fSArnaldo Carvalho de Melo __u8 nexthdr = ipv6_hdr(skb)->nexthdr; 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvalds if (len < 0) 1391da177e4SLinus Torvalds return 1; 1401da177e4SLinus Torvalds 1410d3d077cSHerbert Xu ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr); 1421da177e4SLinus Torvalds if (ptr < 0) 1431da177e4SLinus Torvalds return 0; 1441da177e4SLinus Torvalds if (nexthdr == IPPROTO_ICMPV6) { 1451da177e4SLinus Torvalds u8 _type, *tp; 1461da177e4SLinus Torvalds tp = skb_header_pointer(skb, 1471da177e4SLinus Torvalds ptr+offsetof(struct icmp6hdr, icmp6_type), 1481da177e4SLinus Torvalds sizeof(_type), &_type); 1491da177e4SLinus Torvalds if (tp == NULL || 1501da177e4SLinus Torvalds !(*tp & ICMPV6_INFOMSG_MASK)) 1511da177e4SLinus Torvalds return 1; 1521da177e4SLinus Torvalds } 1531da177e4SLinus Torvalds return 0; 1541da177e4SLinus Torvalds } 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds /* 1571da177e4SLinus Torvalds * Check the ICMP output rate limit 1581da177e4SLinus Torvalds */ 159d5fdd6baSBrian Haley static inline int icmpv6_xrlim_allow(struct sock *sk, u8 type, 1601da177e4SLinus Torvalds struct flowi *fl) 1611da177e4SLinus Torvalds { 1621da177e4SLinus Torvalds struct dst_entry *dst; 1633b1e0a65SYOSHIFUJI Hideaki struct net *net = sock_net(sk); 1641da177e4SLinus Torvalds int res = 0; 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds /* Informational messages are not limited. */ 1671da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 1681da177e4SLinus Torvalds return 1; 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds /* Do not limit pmtu discovery, it would break it. */ 1711da177e4SLinus Torvalds if (type == ICMPV6_PKT_TOOBIG) 1721da177e4SLinus Torvalds return 1; 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds /* 1751da177e4SLinus Torvalds * Look up the output route. 1761da177e4SLinus Torvalds * XXX: perhaps the expire for routing entries cloned by 1771da177e4SLinus Torvalds * this lookup should be more aggressive (not longer than timeout). 1781da177e4SLinus Torvalds */ 1799a43b709SBenjamin Thery dst = ip6_route_output(net, sk, fl); 1801da177e4SLinus Torvalds if (dst->error) { 1813bd653c8SDenis V. Lunev IP6_INC_STATS(net, ip6_dst_idev(dst), 182a11d206dSYOSHIFUJI Hideaki IPSTATS_MIB_OUTNOROUTES); 1831da177e4SLinus Torvalds } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { 1841da177e4SLinus Torvalds res = 1; 1851da177e4SLinus Torvalds } else { 1861da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 1879a43b709SBenjamin Thery int tmo = net->ipv6.sysctl.icmpv6_time; 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds /* Give more bandwidth to wider prefixes. */ 1901da177e4SLinus Torvalds if (rt->rt6i_dst.plen < 128) 1911da177e4SLinus Torvalds tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds res = xrlim_allow(dst, tmo); 1941da177e4SLinus Torvalds } 1951da177e4SLinus Torvalds dst_release(dst); 1961da177e4SLinus Torvalds return res; 1971da177e4SLinus Torvalds } 1981da177e4SLinus Torvalds 1991da177e4SLinus Torvalds /* 2001da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2011da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2021da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2031da177e4SLinus Torvalds * highest-order two bits set to 10 2041da177e4SLinus Torvalds */ 2051da177e4SLinus Torvalds 2061da177e4SLinus Torvalds static __inline__ int opt_unrec(struct sk_buff *skb, __u32 offset) 2071da177e4SLinus Torvalds { 2081da177e4SLinus Torvalds u8 _optval, *op; 2091da177e4SLinus Torvalds 210bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2111da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 2121da177e4SLinus Torvalds if (op == NULL) 2131da177e4SLinus Torvalds return 1; 2141da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2151da177e4SLinus Torvalds } 2161da177e4SLinus Torvalds 2171da177e4SLinus Torvalds static int icmpv6_push_pending_frames(struct sock *sk, struct flowi *fl, struct icmp6hdr *thdr, int len) 2181da177e4SLinus Torvalds { 2191da177e4SLinus Torvalds struct sk_buff *skb; 2201da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2211da177e4SLinus Torvalds int err = 0; 2221da177e4SLinus Torvalds 2231da177e4SLinus Torvalds if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 2241da177e4SLinus Torvalds goto out; 2251da177e4SLinus Torvalds 226cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2271da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2281da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2291da177e4SLinus Torvalds 2301da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 23107f0757aSJoe Perches skb->csum = csum_partial(icmp6h, 2321da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2331da177e4SLinus Torvalds icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src, 2341da177e4SLinus Torvalds &fl->fl6_dst, 2351da177e4SLinus Torvalds len, fl->proto, 2361da177e4SLinus Torvalds skb->csum); 2371da177e4SLinus Torvalds } else { 238868c86bcSAl Viro __wsum tmp_csum = 0; 2391da177e4SLinus Torvalds 2401da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2411da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2421da177e4SLinus Torvalds } 2431da177e4SLinus Torvalds 24407f0757aSJoe Perches tmp_csum = csum_partial(icmp6h, 2451da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 246868c86bcSAl Viro icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src, 2471da177e4SLinus Torvalds &fl->fl6_dst, 248868c86bcSAl Viro len, fl->proto, 249868c86bcSAl Viro tmp_csum); 2501da177e4SLinus Torvalds } 2511da177e4SLinus Torvalds ip6_push_pending_frames(sk); 2521da177e4SLinus Torvalds out: 2531da177e4SLinus Torvalds return err; 2541da177e4SLinus Torvalds } 2551da177e4SLinus Torvalds 2561da177e4SLinus Torvalds struct icmpv6_msg { 2571da177e4SLinus Torvalds struct sk_buff *skb; 2581da177e4SLinus Torvalds int offset; 259763ecff1SYasuyuki Kozakai uint8_t type; 2601da177e4SLinus Torvalds }; 2611da177e4SLinus Torvalds 2621da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 2631da177e4SLinus Torvalds { 2641da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 2651da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 2665f92a738SAl Viro __wsum csum = 0; 2671da177e4SLinus Torvalds 2681da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 2691da177e4SLinus Torvalds to, len, csum); 2701da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 271763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 272763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 2731da177e4SLinus Torvalds return 0; 2741da177e4SLinus Torvalds } 2751da177e4SLinus Torvalds 27659fbb3a6SMasahide NAKAMURA #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 27779383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 27879383236SMasahide NAKAMURA { 2790660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 28079383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 28179383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 28279383236SMasahide NAKAMURA struct in6_addr tmp; 28379383236SMasahide NAKAMURA int off; 28479383236SMasahide NAKAMURA 28579383236SMasahide NAKAMURA if (opt->dsthao) { 28679383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 28779383236SMasahide NAKAMURA if (likely(off >= 0)) { 288d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 289d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 29079383236SMasahide NAKAMURA ipv6_addr_copy(&tmp, &iph->saddr); 29179383236SMasahide NAKAMURA ipv6_addr_copy(&iph->saddr, &hao->addr); 29279383236SMasahide NAKAMURA ipv6_addr_copy(&hao->addr, &tmp); 29379383236SMasahide NAKAMURA } 29479383236SMasahide NAKAMURA } 29579383236SMasahide NAKAMURA } 29679383236SMasahide NAKAMURA #else 29779383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 29879383236SMasahide NAKAMURA #endif 29979383236SMasahide NAKAMURA 3001da177e4SLinus Torvalds /* 3011da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 3021da177e4SLinus Torvalds */ 3033ffe533cSAlexey Dobriyan void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info) 3041da177e4SLinus Torvalds { 305c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 3061da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 3070660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 30884427d53SYOSHIFUJI Hideaki struct sock *sk; 30984427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 3101da177e4SLinus Torvalds struct in6_addr *saddr = NULL; 3111da177e4SLinus Torvalds struct dst_entry *dst; 3128b7817f3SHerbert Xu struct dst_entry *dst2; 3131da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 3141da177e4SLinus Torvalds struct flowi fl; 3158b7817f3SHerbert Xu struct flowi fl2; 3161da177e4SLinus Torvalds struct icmpv6_msg msg; 3171da177e4SLinus Torvalds int iif = 0; 3181da177e4SLinus Torvalds int addr_type = 0; 3191da177e4SLinus Torvalds int len; 320e651f03aSGerrit Renker int hlimit; 3211da177e4SLinus Torvalds int err = 0; 3221da177e4SLinus Torvalds 32327a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 32427a884dcSArnaldo Carvalho de Melo (skb->network_header + sizeof(*hdr)) > skb->tail) 3251da177e4SLinus Torvalds return; 3261da177e4SLinus Torvalds 3271da177e4SLinus Torvalds /* 3281da177e4SLinus Torvalds * Make sure we respect the rules 3291da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 3301da177e4SLinus Torvalds * Rule (e.1) is enforced by not using icmpv6_send 3311da177e4SLinus Torvalds * in any code that processes icmp errors. 3321da177e4SLinus Torvalds */ 3331da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 3341da177e4SLinus Torvalds 3359a43b709SBenjamin Thery if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0)) 3361da177e4SLinus Torvalds saddr = &hdr->daddr; 3371da177e4SLinus Torvalds 3381da177e4SLinus Torvalds /* 3391da177e4SLinus Torvalds * Dest addr check 3401da177e4SLinus Torvalds */ 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) { 3431da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 3441da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 3451da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 3461da177e4SLinus Torvalds (opt_unrec(skb, info)))) 3471da177e4SLinus Torvalds return; 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds saddr = NULL; 3501da177e4SLinus Torvalds } 3511da177e4SLinus Torvalds 3521da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 3531da177e4SLinus Torvalds 3541da177e4SLinus Torvalds /* 3551da177e4SLinus Torvalds * Source addr check 3561da177e4SLinus Torvalds */ 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvalds if (addr_type & IPV6_ADDR_LINKLOCAL) 3591da177e4SLinus Torvalds iif = skb->dev->ifindex; 3601da177e4SLinus Torvalds 3611da177e4SLinus Torvalds /* 3628de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 3638de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 3648de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 3658de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 3661da177e4SLinus Torvalds */ 3671da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 36864ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n"); 3691da177e4SLinus Torvalds return; 3701da177e4SLinus Torvalds } 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds /* 3731da177e4SLinus Torvalds * Never answer to a ICMP packet. 3741da177e4SLinus Torvalds */ 3751da177e4SLinus Torvalds if (is_ineligible(skb)) { 37664ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n"); 3771da177e4SLinus Torvalds return; 3781da177e4SLinus Torvalds } 3791da177e4SLinus Torvalds 38079383236SMasahide NAKAMURA mip6_addr_swap(skb); 38179383236SMasahide NAKAMURA 3821da177e4SLinus Torvalds memset(&fl, 0, sizeof(fl)); 3831da177e4SLinus Torvalds fl.proto = IPPROTO_ICMPV6; 3841da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_dst, &hdr->saddr); 3851da177e4SLinus Torvalds if (saddr) 3861da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_src, saddr); 3871da177e4SLinus Torvalds fl.oif = iif; 3881da177e4SLinus Torvalds fl.fl_icmp_type = type; 3891da177e4SLinus Torvalds fl.fl_icmp_code = code; 390beb8d13bSVenkat Yekkirala security_skb_classify_flow(skb, &fl); 3911da177e4SLinus Torvalds 392fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 393fdc0bde9SDenis V. Lunev if (sk == NULL) 394405666dbSDenis V. Lunev return; 395fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 396405666dbSDenis V. Lunev 3971da177e4SLinus Torvalds if (!icmpv6_xrlim_allow(sk, type, &fl)) 3981da177e4SLinus Torvalds goto out; 3991da177e4SLinus Torvalds 4001da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 4011da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 4021da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 4031da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 4061da177e4SLinus Torvalds fl.oif = np->mcast_oif; 4071da177e4SLinus Torvalds 4081da177e4SLinus Torvalds err = ip6_dst_lookup(sk, &dst, &fl); 4091da177e4SLinus Torvalds if (err) 4101da177e4SLinus Torvalds goto out; 4118de3351eSYOSHIFUJI Hideaki 4128de3351eSYOSHIFUJI Hideaki /* 4138de3351eSYOSHIFUJI Hideaki * We won't send icmp if the destination is known 4148de3351eSYOSHIFUJI Hideaki * anycast. 4158de3351eSYOSHIFUJI Hideaki */ 4168de3351eSYOSHIFUJI Hideaki if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { 4178de3351eSYOSHIFUJI Hideaki LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n"); 4188de3351eSYOSHIFUJI Hideaki goto out_dst_release; 4198de3351eSYOSHIFUJI Hideaki } 4208de3351eSYOSHIFUJI Hideaki 4218b7817f3SHerbert Xu /* No need to clone since we're just using its address. */ 4228b7817f3SHerbert Xu dst2 = dst; 4238b7817f3SHerbert Xu 42452479b62SAlexey Dobriyan err = xfrm_lookup(net, &dst, &fl, sk, 0); 4258b7817f3SHerbert Xu switch (err) { 4268b7817f3SHerbert Xu case 0: 4278b7817f3SHerbert Xu if (dst != dst2) 4288b7817f3SHerbert Xu goto route_done; 4298b7817f3SHerbert Xu break; 4308b7817f3SHerbert Xu case -EPERM: 4318b7817f3SHerbert Xu dst = NULL; 4328b7817f3SHerbert Xu break; 4338b7817f3SHerbert Xu default: 4348b7817f3SHerbert Xu goto out; 4358b7817f3SHerbert Xu } 4368b7817f3SHerbert Xu 4378b7817f3SHerbert Xu if (xfrm_decode_session_reverse(skb, &fl2, AF_INET6)) 438af268182SHerbert Xu goto relookup_failed; 4391da177e4SLinus Torvalds 4406c06a478SJiri Pirko if (ip6_dst_lookup(sk, &dst2, &fl2)) 441af268182SHerbert Xu goto relookup_failed; 4428b7817f3SHerbert Xu 4436c06a478SJiri Pirko err = xfrm_lookup(net, &dst2, &fl2, sk, XFRM_LOOKUP_ICMP); 444af268182SHerbert Xu switch (err) { 445af268182SHerbert Xu case 0: 4468b7817f3SHerbert Xu dst_release(dst); 4478b7817f3SHerbert Xu dst = dst2; 448af268182SHerbert Xu break; 449af268182SHerbert Xu case -EPERM: 450af268182SHerbert Xu goto out_dst_release; 451af268182SHerbert Xu default: 452af268182SHerbert Xu relookup_failed: 453af268182SHerbert Xu if (!dst) 4548b7817f3SHerbert Xu goto out; 455af268182SHerbert Xu break; 456af268182SHerbert Xu } 4578b7817f3SHerbert Xu 4588b7817f3SHerbert Xu route_done: 4591da177e4SLinus Torvalds if (ipv6_addr_is_multicast(&fl.fl6_dst)) 4601da177e4SLinus Torvalds hlimit = np->mcast_hops; 4611da177e4SLinus Torvalds else 4621da177e4SLinus Torvalds hlimit = np->hop_limit; 4631da177e4SLinus Torvalds if (hlimit < 0) 4646b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 4651da177e4SLinus Torvalds 4661da177e4SLinus Torvalds msg.skb = skb; 467bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 468763ecff1SYasuyuki Kozakai msg.type = type; 4691da177e4SLinus Torvalds 4701da177e4SLinus Torvalds len = skb->len - msg.offset; 4711da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); 4721da177e4SLinus Torvalds if (len < 0) { 47364ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n"); 4741da177e4SLinus Torvalds goto out_dst_release; 4751da177e4SLinus Torvalds } 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds idev = in6_dev_get(skb->dev); 4781da177e4SLinus Torvalds 4791da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, 4801da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 481e651f03aSGerrit Renker sizeof(struct icmp6hdr), hlimit, 482e651f03aSGerrit Renker np->tclass, NULL, &fl, (struct rt6_info*)dst, 4831da177e4SLinus Torvalds MSG_DONTWAIT); 4841da177e4SLinus Torvalds if (err) { 4851f8438a8SEric Dumazet ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS); 4861da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 4871da177e4SLinus Torvalds goto out_put; 4881da177e4SLinus Torvalds } 4891da177e4SLinus Torvalds err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, len + sizeof(struct icmp6hdr)); 4901da177e4SLinus Torvalds 4911da177e4SLinus Torvalds out_put: 4921da177e4SLinus Torvalds if (likely(idev != NULL)) 4931da177e4SLinus Torvalds in6_dev_put(idev); 4941da177e4SLinus Torvalds out_dst_release: 4951da177e4SLinus Torvalds dst_release(dst); 4961da177e4SLinus Torvalds out: 497405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 4981da177e4SLinus Torvalds } 4991da177e4SLinus Torvalds 5007159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_send); 5017159039aSYOSHIFUJI Hideaki 5021da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 5031da177e4SLinus Torvalds { 504c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 50584427d53SYOSHIFUJI Hideaki struct sock *sk; 5061da177e4SLinus Torvalds struct inet6_dev *idev; 50784427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 5081da177e4SLinus Torvalds struct in6_addr *saddr = NULL; 509cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 5101da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 5111da177e4SLinus Torvalds struct flowi fl; 5121da177e4SLinus Torvalds struct icmpv6_msg msg; 5131da177e4SLinus Torvalds struct dst_entry *dst; 5141da177e4SLinus Torvalds int err = 0; 5151da177e4SLinus Torvalds int hlimit; 5161da177e4SLinus Torvalds 5170660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 5181da177e4SLinus Torvalds 5191da177e4SLinus Torvalds if (!ipv6_unicast_destination(skb)) 5201da177e4SLinus Torvalds saddr = NULL; 5211da177e4SLinus Torvalds 5221da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 5231da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 5241da177e4SLinus Torvalds 5251da177e4SLinus Torvalds memset(&fl, 0, sizeof(fl)); 5261da177e4SLinus Torvalds fl.proto = IPPROTO_ICMPV6; 5270660e03fSArnaldo Carvalho de Melo ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); 5281da177e4SLinus Torvalds if (saddr) 5291da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_src, saddr); 5301da177e4SLinus Torvalds fl.oif = skb->dev->ifindex; 5311da177e4SLinus Torvalds fl.fl_icmp_type = ICMPV6_ECHO_REPLY; 532beb8d13bSVenkat Yekkirala security_skb_classify_flow(skb, &fl); 5331da177e4SLinus Torvalds 534fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 535fdc0bde9SDenis V. Lunev if (sk == NULL) 536405666dbSDenis V. Lunev return; 537fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 538405666dbSDenis V. Lunev 5391da177e4SLinus Torvalds if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 5401da177e4SLinus Torvalds fl.oif = np->mcast_oif; 5411da177e4SLinus Torvalds 5421da177e4SLinus Torvalds err = ip6_dst_lookup(sk, &dst, &fl); 5431da177e4SLinus Torvalds if (err) 5441da177e4SLinus Torvalds goto out; 54552479b62SAlexey Dobriyan if ((err = xfrm_lookup(net, &dst, &fl, sk, 0)) < 0) 546e104411bSPatrick McHardy goto out; 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvalds if (ipv6_addr_is_multicast(&fl.fl6_dst)) 5491da177e4SLinus Torvalds hlimit = np->mcast_hops; 5501da177e4SLinus Torvalds else 5511da177e4SLinus Torvalds hlimit = np->hop_limit; 5521da177e4SLinus Torvalds if (hlimit < 0) 5536b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 5541da177e4SLinus Torvalds 5551da177e4SLinus Torvalds idev = in6_dev_get(skb->dev); 5561da177e4SLinus Torvalds 5571da177e4SLinus Torvalds msg.skb = skb; 5581da177e4SLinus Torvalds msg.offset = 0; 559763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 5601da177e4SLinus Torvalds 5611da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 562e651f03aSGerrit Renker sizeof(struct icmp6hdr), hlimit, np->tclass, NULL, &fl, 5631da177e4SLinus Torvalds (struct rt6_info*)dst, MSG_DONTWAIT); 5641da177e4SLinus Torvalds 5651da177e4SLinus Torvalds if (err) { 5661f8438a8SEric Dumazet ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS); 5671da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 5681da177e4SLinus Torvalds goto out_put; 5691da177e4SLinus Torvalds } 5701da177e4SLinus Torvalds err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, skb->len + sizeof(struct icmp6hdr)); 5711da177e4SLinus Torvalds 5721da177e4SLinus Torvalds out_put: 5731da177e4SLinus Torvalds if (likely(idev != NULL)) 5741da177e4SLinus Torvalds in6_dev_put(idev); 5751da177e4SLinus Torvalds dst_release(dst); 5761da177e4SLinus Torvalds out: 577405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5781da177e4SLinus Torvalds } 5791da177e4SLinus Torvalds 580d5fdd6baSBrian Haley static void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 5811da177e4SLinus Torvalds { 58241135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 5831da177e4SLinus Torvalds int inner_offset; 5841da177e4SLinus Torvalds int hash; 5851da177e4SLinus Torvalds u8 nexthdr; 5861da177e4SLinus Torvalds 5871da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 5881da177e4SLinus Torvalds return; 5891da177e4SLinus Torvalds 5901da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 5911da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 5921da177e4SLinus Torvalds /* now skip over extension headers */ 5930d3d077cSHerbert Xu inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr); 5941da177e4SLinus Torvalds if (inner_offset<0) 5951da177e4SLinus Torvalds return; 5961da177e4SLinus Torvalds } else { 5971da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 5981da177e4SLinus Torvalds } 5991da177e4SLinus Torvalds 6001da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 6011da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 6021da177e4SLinus Torvalds return; 6031da177e4SLinus Torvalds 6041da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 6051da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 6061da177e4SLinus Torvalds pmtu discovery. 6071da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 6081da177e4SLinus Torvalds --ANK (980726) 6091da177e4SLinus Torvalds */ 6101da177e4SLinus Torvalds 6111da177e4SLinus Torvalds hash = nexthdr & (MAX_INET_PROTOS - 1); 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds rcu_read_lock(); 6141da177e4SLinus Torvalds ipprot = rcu_dereference(inet6_protos[hash]); 6151da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 6161da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 6171da177e4SLinus Torvalds rcu_read_unlock(); 6181da177e4SLinus Torvalds 61969d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 6201da177e4SLinus Torvalds } 6211da177e4SLinus Torvalds 6221da177e4SLinus Torvalds /* 6231da177e4SLinus Torvalds * Handle icmp messages 6241da177e4SLinus Torvalds */ 6251da177e4SLinus Torvalds 626e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 6271da177e4SLinus Torvalds { 6281da177e4SLinus Torvalds struct net_device *dev = skb->dev; 6291da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 6301da177e4SLinus Torvalds struct in6_addr *saddr, *daddr; 6311da177e4SLinus Torvalds struct ipv6hdr *orig_hdr; 6321da177e4SLinus Torvalds struct icmp6hdr *hdr; 633d5fdd6baSBrian Haley u8 type; 6341da177e4SLinus Torvalds 635aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 636def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 6378b7817f3SHerbert Xu int nh; 6388b7817f3SHerbert Xu 639def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 640aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 641aebcf82cSHerbert Xu goto drop_no_count; 642aebcf82cSHerbert Xu 6438b7817f3SHerbert Xu if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(*orig_hdr))) 6448b7817f3SHerbert Xu goto drop_no_count; 6458b7817f3SHerbert Xu 6468b7817f3SHerbert Xu nh = skb_network_offset(skb); 6478b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 6488b7817f3SHerbert Xu 6498b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 6508b7817f3SHerbert Xu goto drop_no_count; 6518b7817f3SHerbert Xu 6528b7817f3SHerbert Xu skb_set_network_header(skb, nh); 6538b7817f3SHerbert Xu } 6548b7817f3SHerbert Xu 655e41b5368SDenis V. Lunev ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INMSGS); 6561da177e4SLinus Torvalds 6570660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 6580660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 6591da177e4SLinus Torvalds 6601da177e4SLinus Torvalds /* Perform checksum. */ 661fb286bb2SHerbert Xu switch (skb->ip_summed) { 66284fa7933SPatrick McHardy case CHECKSUM_COMPLETE: 663fb286bb2SHerbert Xu if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, 664fb286bb2SHerbert Xu skb->csum)) 665fb286bb2SHerbert Xu break; 666fb286bb2SHerbert Xu /* fall through */ 667fb286bb2SHerbert Xu case CHECKSUM_NONE: 668868c86bcSAl Viro skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len, 669868c86bcSAl Viro IPPROTO_ICMPV6, 0)); 670fb286bb2SHerbert Xu if (__skb_checksum_complete(skb)) { 6715b095d98SHarvey Harrison LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [%pI6 > %pI6]\n", 6720c6ce78aSHarvey Harrison saddr, daddr); 6731da177e4SLinus Torvalds goto discard_it; 6741da177e4SLinus Torvalds } 6751da177e4SLinus Torvalds } 6761da177e4SLinus Torvalds 6778cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 6788cf22943SHerbert Xu goto discard_it; 6791da177e4SLinus Torvalds 680cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 6811da177e4SLinus Torvalds 6821da177e4SLinus Torvalds type = hdr->icmp6_type; 6831da177e4SLinus Torvalds 68455d43808SDenis V. Lunev ICMP6MSGIN_INC_STATS_BH(dev_net(dev), idev, type); 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvalds switch (type) { 6871da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 6881da177e4SLinus Torvalds icmpv6_echo_reply(skb); 6891da177e4SLinus Torvalds break; 6901da177e4SLinus Torvalds 6911da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 6921da177e4SLinus Torvalds /* we couldn't care less */ 6931da177e4SLinus Torvalds break; 6941da177e4SLinus Torvalds 6951da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 6961da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 6971da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 6981da177e4SLinus Torvalds destination cache will allow to solve this problem 6991da177e4SLinus Torvalds --ANK (980726) 7001da177e4SLinus Torvalds */ 7011da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 7021da177e4SLinus Torvalds goto discard_it; 703cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 7041da177e4SLinus Torvalds orig_hdr = (struct ipv6hdr *) (hdr + 1); 7051da177e4SLinus Torvalds rt6_pmtu_discovery(&orig_hdr->daddr, &orig_hdr->saddr, dev, 7061da177e4SLinus Torvalds ntohl(hdr->icmp6_mtu)); 7071da177e4SLinus Torvalds 7081da177e4SLinus Torvalds /* 7091da177e4SLinus Torvalds * Drop through to notify 7101da177e4SLinus Torvalds */ 7111da177e4SLinus Torvalds 7121da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 7131da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 7141da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 7151da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7161da177e4SLinus Torvalds break; 7171da177e4SLinus Torvalds 7181da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 7191da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 7201da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 7211da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 7221da177e4SLinus Torvalds case NDISC_REDIRECT: 7231da177e4SLinus Torvalds ndisc_rcv(skb); 7241da177e4SLinus Torvalds break; 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 7271da177e4SLinus Torvalds igmp6_event_query(skb); 7281da177e4SLinus Torvalds break; 7291da177e4SLinus Torvalds 7301da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 7311da177e4SLinus Torvalds igmp6_event_report(skb); 7321da177e4SLinus Torvalds break; 7331da177e4SLinus Torvalds 7341da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 7351da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 7361da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 7371da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 7381da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 7391da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 7401da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 7411da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 7421da177e4SLinus Torvalds break; 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds default: 74564ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n"); 7461da177e4SLinus Torvalds 7471da177e4SLinus Torvalds /* informational */ 7481da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 7491da177e4SLinus Torvalds break; 7501da177e4SLinus Torvalds 7511da177e4SLinus Torvalds /* 7521da177e4SLinus Torvalds * error of unknown type. 7531da177e4SLinus Torvalds * must pass to upper level 7541da177e4SLinus Torvalds */ 7551da177e4SLinus Torvalds 7561da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7573ff50b79SStephen Hemminger } 7583ff50b79SStephen Hemminger 7591da177e4SLinus Torvalds kfree_skb(skb); 7601da177e4SLinus Torvalds return 0; 7611da177e4SLinus Torvalds 7621da177e4SLinus Torvalds discard_it: 763e41b5368SDenis V. Lunev ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INERRORS); 7648b7817f3SHerbert Xu drop_no_count: 7651da177e4SLinus Torvalds kfree_skb(skb); 7661da177e4SLinus Torvalds return 0; 7671da177e4SLinus Torvalds } 7681da177e4SLinus Torvalds 76995e41e93SYOSHIFUJI Hideaki void icmpv6_flow_init(struct sock *sk, struct flowi *fl, 77095e41e93SYOSHIFUJI Hideaki u8 type, 77195e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 77295e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 77395e41e93SYOSHIFUJI Hideaki int oif) 77495e41e93SYOSHIFUJI Hideaki { 77595e41e93SYOSHIFUJI Hideaki memset(fl, 0, sizeof(*fl)); 77695e41e93SYOSHIFUJI Hideaki ipv6_addr_copy(&fl->fl6_src, saddr); 77795e41e93SYOSHIFUJI Hideaki ipv6_addr_copy(&fl->fl6_dst, daddr); 77895e41e93SYOSHIFUJI Hideaki fl->proto = IPPROTO_ICMPV6; 77995e41e93SYOSHIFUJI Hideaki fl->fl_icmp_type = type; 78095e41e93SYOSHIFUJI Hideaki fl->fl_icmp_code = 0; 78195e41e93SYOSHIFUJI Hideaki fl->oif = oif; 78295e41e93SYOSHIFUJI Hideaki security_sk_classify_flow(sk, fl); 78395e41e93SYOSHIFUJI Hideaki } 78495e41e93SYOSHIFUJI Hideaki 785640c41c7SIngo Molnar /* 786b7e729c4SDenis V. Lunev * Special lock-class for __icmpv6_sk: 787640c41c7SIngo Molnar */ 788640c41c7SIngo Molnar static struct lock_class_key icmpv6_socket_sk_dst_lock_key; 789640c41c7SIngo Molnar 79098c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 7911da177e4SLinus Torvalds { 7921da177e4SLinus Torvalds struct sock *sk; 7931da177e4SLinus Torvalds int err, i, j; 7941da177e4SLinus Torvalds 79598c6d1b2SDenis V. Lunev net->ipv6.icmp_sk = 79698c6d1b2SDenis V. Lunev kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); 79798c6d1b2SDenis V. Lunev if (net->ipv6.icmp_sk == NULL) 79879c91159SDenis V. Lunev return -ENOMEM; 79979c91159SDenis V. Lunev 8006f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8011ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 8021ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 8031da177e4SLinus Torvalds if (err < 0) { 8041da177e4SLinus Torvalds printk(KERN_ERR 8051da177e4SLinus Torvalds "Failed to initialize the ICMP6 control socket " 8061da177e4SLinus Torvalds "(err %d).\n", 8071da177e4SLinus Torvalds err); 8081da177e4SLinus Torvalds goto fail; 8091da177e4SLinus Torvalds } 8101da177e4SLinus Torvalds 8111ed8516fSDenis V. Lunev net->ipv6.icmp_sk[i] = sk; 8125c8cafd6SDenis V. Lunev 813640c41c7SIngo Molnar /* 814640c41c7SIngo Molnar * Split off their lock-class, because sk->sk_dst_lock 815640c41c7SIngo Molnar * gets used from softirqs, which is safe for 816b7e729c4SDenis V. Lunev * __icmpv6_sk (because those never get directly used 817640c41c7SIngo Molnar * via userspace syscalls), but unsafe for normal sockets. 818640c41c7SIngo Molnar */ 819640c41c7SIngo Molnar lockdep_set_class(&sk->sk_dst_lock, 820640c41c7SIngo Molnar &icmpv6_socket_sk_dst_lock_key); 8211da177e4SLinus Torvalds 8221da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 8231da177e4SLinus Torvalds * sk_buff struct overhead. 8241da177e4SLinus Torvalds */ 8251da177e4SLinus Torvalds sk->sk_sndbuf = 8261da177e4SLinus Torvalds (2 * ((64 * 1024) + sizeof(struct sk_buff))); 8271da177e4SLinus Torvalds } 8281da177e4SLinus Torvalds return 0; 8291da177e4SLinus Torvalds 8301da177e4SLinus Torvalds fail: 8315c8cafd6SDenis V. Lunev for (j = 0; j < i; j++) 8321ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); 83398c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 8341da177e4SLinus Torvalds return err; 8351da177e4SLinus Torvalds } 8361da177e4SLinus Torvalds 83798c6d1b2SDenis V. Lunev static void __net_exit icmpv6_sk_exit(struct net *net) 8381da177e4SLinus Torvalds { 8391da177e4SLinus Torvalds int i; 8401da177e4SLinus Torvalds 8416f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8421ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); 8431da177e4SLinus Torvalds } 84498c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 84598c6d1b2SDenis V. Lunev } 84698c6d1b2SDenis V. Lunev 8478ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 84898c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 84998c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 85098c6d1b2SDenis V. Lunev }; 85198c6d1b2SDenis V. Lunev 85298c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 85398c6d1b2SDenis V. Lunev { 85498c6d1b2SDenis V. Lunev int err; 85598c6d1b2SDenis V. Lunev 85698c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 85798c6d1b2SDenis V. Lunev if (err < 0) 85898c6d1b2SDenis V. Lunev return err; 85998c6d1b2SDenis V. Lunev 86098c6d1b2SDenis V. Lunev err = -EAGAIN; 86198c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 86298c6d1b2SDenis V. Lunev goto fail; 86398c6d1b2SDenis V. Lunev return 0; 86498c6d1b2SDenis V. Lunev 86598c6d1b2SDenis V. Lunev fail: 86698c6d1b2SDenis V. Lunev printk(KERN_ERR "Failed to register ICMP6 protocol\n"); 86798c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 86898c6d1b2SDenis V. Lunev return err; 86998c6d1b2SDenis V. Lunev } 87098c6d1b2SDenis V. Lunev 8718ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 87298c6d1b2SDenis V. Lunev { 87398c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 8741da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 8751da177e4SLinus Torvalds } 8761da177e4SLinus Torvalds 87798c6d1b2SDenis V. Lunev 8789b5b5cffSArjan van de Ven static const struct icmp6_err { 8791da177e4SLinus Torvalds int err; 8801da177e4SLinus Torvalds int fatal; 8811da177e4SLinus Torvalds } tab_unreach[] = { 8821da177e4SLinus Torvalds { /* NOROUTE */ 8831da177e4SLinus Torvalds .err = ENETUNREACH, 8841da177e4SLinus Torvalds .fatal = 0, 8851da177e4SLinus Torvalds }, 8861da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 8871da177e4SLinus Torvalds .err = EACCES, 8881da177e4SLinus Torvalds .fatal = 1, 8891da177e4SLinus Torvalds }, 8901da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 8911da177e4SLinus Torvalds .err = EHOSTUNREACH, 8921da177e4SLinus Torvalds .fatal = 0, 8931da177e4SLinus Torvalds }, 8941da177e4SLinus Torvalds { /* ADDR_UNREACH */ 8951da177e4SLinus Torvalds .err = EHOSTUNREACH, 8961da177e4SLinus Torvalds .fatal = 0, 8971da177e4SLinus Torvalds }, 8981da177e4SLinus Torvalds { /* PORT_UNREACH */ 8991da177e4SLinus Torvalds .err = ECONNREFUSED, 9001da177e4SLinus Torvalds .fatal = 1, 9011da177e4SLinus Torvalds }, 9021da177e4SLinus Torvalds }; 9031da177e4SLinus Torvalds 904d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 9051da177e4SLinus Torvalds { 9061da177e4SLinus Torvalds int fatal = 0; 9071da177e4SLinus Torvalds 9081da177e4SLinus Torvalds *err = EPROTO; 9091da177e4SLinus Torvalds 9101da177e4SLinus Torvalds switch (type) { 9111da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 9121da177e4SLinus Torvalds fatal = 1; 9131da177e4SLinus Torvalds if (code <= ICMPV6_PORT_UNREACH) { 9141da177e4SLinus Torvalds *err = tab_unreach[code].err; 9151da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 9161da177e4SLinus Torvalds } 9171da177e4SLinus Torvalds break; 9181da177e4SLinus Torvalds 9191da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 9201da177e4SLinus Torvalds *err = EMSGSIZE; 9211da177e4SLinus Torvalds break; 9221da177e4SLinus Torvalds 9231da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 9241da177e4SLinus Torvalds *err = EPROTO; 9251da177e4SLinus Torvalds fatal = 1; 9261da177e4SLinus Torvalds break; 9271da177e4SLinus Torvalds 9281da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 9291da177e4SLinus Torvalds *err = EHOSTUNREACH; 9301da177e4SLinus Torvalds break; 9313ff50b79SStephen Hemminger } 9321da177e4SLinus Torvalds 9331da177e4SLinus Torvalds return fatal; 9341da177e4SLinus Torvalds } 9351da177e4SLinus Torvalds 9367159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 9377159039aSYOSHIFUJI Hideaki 9381da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 939760f2d01SDaniel Lezcano ctl_table ipv6_icmp_table_template[] = { 9401da177e4SLinus Torvalds { 9411da177e4SLinus Torvalds .procname = "ratelimit", 94241a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 9431da177e4SLinus Torvalds .maxlen = sizeof(int), 9441da177e4SLinus Torvalds .mode = 0644, 9456d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 9461da177e4SLinus Torvalds }, 947f8572d8fSEric W. Biederman { }, 9481da177e4SLinus Torvalds }; 949760f2d01SDaniel Lezcano 9502c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 951760f2d01SDaniel Lezcano { 952760f2d01SDaniel Lezcano struct ctl_table *table; 953760f2d01SDaniel Lezcano 954760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 955760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 956760f2d01SDaniel Lezcano GFP_KERNEL); 9575ee09105SYOSHIFUJI Hideaki 9585ee09105SYOSHIFUJI Hideaki if (table) 9595ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 9605ee09105SYOSHIFUJI Hideaki 961760f2d01SDaniel Lezcano return table; 962760f2d01SDaniel Lezcano } 9631da177e4SLinus Torvalds #endif 9641da177e4SLinus Torvalds 965