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 * $Id: icmp.c,v 1.38 2002/02/08 03:57:19 davem Exp $ 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * Based on net/ipv4/icmp.c 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * RFC 1885 131da177e4SLinus Torvalds * 141da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 151da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 161da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 171da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 181da177e4SLinus Torvalds */ 191da177e4SLinus Torvalds 201da177e4SLinus Torvalds /* 211da177e4SLinus Torvalds * Changes: 221da177e4SLinus Torvalds * 231da177e4SLinus Torvalds * Andi Kleen : exception handling 241da177e4SLinus Torvalds * Andi Kleen add rate limits. never reply to a icmp. 251da177e4SLinus Torvalds * add more length checks and other fixes. 261da177e4SLinus Torvalds * yoshfuji : ensure to sent parameter problem for 271da177e4SLinus Torvalds * fragments. 281da177e4SLinus Torvalds * YOSHIFUJI Hideaki @USAGI: added sysctl for icmp rate limit. 291da177e4SLinus Torvalds * Randy Dunlap and 301da177e4SLinus Torvalds * YOSHIFUJI Hideaki @USAGI: Per-interface statistics support 311da177e4SLinus Torvalds * Kazunori MIYAZAWA @USAGI: change output process to use ip6_append_data 321da177e4SLinus Torvalds */ 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds #include <linux/module.h> 351da177e4SLinus Torvalds #include <linux/errno.h> 361da177e4SLinus Torvalds #include <linux/types.h> 371da177e4SLinus Torvalds #include <linux/socket.h> 381da177e4SLinus Torvalds #include <linux/in.h> 391da177e4SLinus Torvalds #include <linux/kernel.h> 401da177e4SLinus Torvalds #include <linux/sockios.h> 411da177e4SLinus Torvalds #include <linux/net.h> 421da177e4SLinus Torvalds #include <linux/skbuff.h> 431da177e4SLinus Torvalds #include <linux/init.h> 44763ecff1SYasuyuki Kozakai #include <linux/netfilter.h> 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 471da177e4SLinus Torvalds #include <linux/sysctl.h> 481da177e4SLinus Torvalds #endif 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds #include <linux/inet.h> 511da177e4SLinus Torvalds #include <linux/netdevice.h> 521da177e4SLinus Torvalds #include <linux/icmpv6.h> 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds #include <net/ip.h> 551da177e4SLinus Torvalds #include <net/sock.h> 561da177e4SLinus Torvalds 571da177e4SLinus Torvalds #include <net/ipv6.h> 581da177e4SLinus Torvalds #include <net/ip6_checksum.h> 591da177e4SLinus Torvalds #include <net/protocol.h> 601da177e4SLinus Torvalds #include <net/raw.h> 611da177e4SLinus Torvalds #include <net/rawv6.h> 621da177e4SLinus Torvalds #include <net/transp_v6.h> 631da177e4SLinus Torvalds #include <net/ip6_route.h> 641da177e4SLinus Torvalds #include <net/addrconf.h> 651da177e4SLinus Torvalds #include <net/icmp.h> 668b7817f3SHerbert Xu #include <net/xfrm.h> 671ed8516fSDenis V. Lunev #include <net/inet_common.h> 681da177e4SLinus Torvalds 691da177e4SLinus Torvalds #include <asm/uaccess.h> 701da177e4SLinus Torvalds #include <asm/system.h> 711da177e4SLinus Torvalds 72ba89966cSEric Dumazet DEFINE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics) __read_mostly; 737159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_statistics); 7414878f75SDavid L Stevens DEFINE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics) __read_mostly; 7514878f75SDavid L Stevens EXPORT_SYMBOL(icmpv6msg_statistics); 761da177e4SLinus Torvalds 771da177e4SLinus Torvalds /* 781da177e4SLinus Torvalds * The ICMP socket(s). This is the most convenient way to flow control 791da177e4SLinus Torvalds * our ICMP output as well as maintain a clean interface throughout 801da177e4SLinus Torvalds * all layers. All Socketless IP sends will soon be gone. 811da177e4SLinus Torvalds * 821da177e4SLinus Torvalds * On SMP we have one ICMP socket per-cpu. 831da177e4SLinus Torvalds */ 8498c6d1b2SDenis V. Lunev static inline struct sock *icmpv6_sk(struct net *net) 8598c6d1b2SDenis V. Lunev { 8698c6d1b2SDenis V. Lunev return net->ipv6.icmp_sk[smp_processor_id()]; 8798c6d1b2SDenis V. Lunev } 881da177e4SLinus Torvalds 89e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb); 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds static struct inet6_protocol icmpv6_protocol = { 921da177e4SLinus Torvalds .handler = icmpv6_rcv, 938b7817f3SHerbert Xu .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 941da177e4SLinus Torvalds }; 951da177e4SLinus Torvalds 96405666dbSDenis V. Lunev static __inline__ int icmpv6_xmit_lock(struct sock *sk) 971da177e4SLinus Torvalds { 981da177e4SLinus Torvalds local_bh_disable(); 991da177e4SLinus Torvalds 100405666dbSDenis V. Lunev if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { 1011da177e4SLinus Torvalds /* This can happen if the output path (f.e. SIT or 1021da177e4SLinus Torvalds * ip6ip6 tunnel) signals dst_link_failure() for an 1031da177e4SLinus Torvalds * outgoing ICMP6 packet. 1041da177e4SLinus Torvalds */ 1051da177e4SLinus Torvalds local_bh_enable(); 1061da177e4SLinus Torvalds return 1; 1071da177e4SLinus Torvalds } 1081da177e4SLinus Torvalds return 0; 1091da177e4SLinus Torvalds } 1101da177e4SLinus Torvalds 111405666dbSDenis V. Lunev static __inline__ void icmpv6_xmit_unlock(struct sock *sk) 1121da177e4SLinus Torvalds { 113405666dbSDenis V. Lunev spin_unlock_bh(&sk->sk_lock.slock); 1141da177e4SLinus Torvalds } 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds /* 1171da177e4SLinus Torvalds * Slightly more convenient version of icmpv6_send. 1181da177e4SLinus Torvalds */ 1191da177e4SLinus Torvalds void icmpv6_param_prob(struct sk_buff *skb, int code, int pos) 1201da177e4SLinus Torvalds { 1211da177e4SLinus Torvalds icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos, skb->dev); 1221da177e4SLinus Torvalds kfree_skb(skb); 1231da177e4SLinus Torvalds } 1241da177e4SLinus Torvalds 1251da177e4SLinus Torvalds /* 1261da177e4SLinus Torvalds * Figure out, may we reply to this packet with icmp error. 1271da177e4SLinus Torvalds * 1281da177e4SLinus Torvalds * We do not reply, if: 1291da177e4SLinus Torvalds * - it was icmp error message. 1301da177e4SLinus Torvalds * - it is truncated, so that it is known, that protocol is ICMPV6 1311da177e4SLinus Torvalds * (i.e. in the middle of some exthdr) 1321da177e4SLinus Torvalds * 1331da177e4SLinus Torvalds * --ANK (980726) 1341da177e4SLinus Torvalds */ 1351da177e4SLinus Torvalds 1361da177e4SLinus Torvalds static int is_ineligible(struct sk_buff *skb) 1371da177e4SLinus Torvalds { 1380660e03fSArnaldo Carvalho de Melo int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; 1391da177e4SLinus Torvalds int len = skb->len - ptr; 1400660e03fSArnaldo Carvalho de Melo __u8 nexthdr = ipv6_hdr(skb)->nexthdr; 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds if (len < 0) 1431da177e4SLinus Torvalds return 1; 1441da177e4SLinus Torvalds 1450d3d077cSHerbert Xu ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr); 1461da177e4SLinus Torvalds if (ptr < 0) 1471da177e4SLinus Torvalds return 0; 1481da177e4SLinus Torvalds if (nexthdr == IPPROTO_ICMPV6) { 1491da177e4SLinus Torvalds u8 _type, *tp; 1501da177e4SLinus Torvalds tp = skb_header_pointer(skb, 1511da177e4SLinus Torvalds ptr+offsetof(struct icmp6hdr, icmp6_type), 1521da177e4SLinus Torvalds sizeof(_type), &_type); 1531da177e4SLinus Torvalds if (tp == NULL || 1541da177e4SLinus Torvalds !(*tp & ICMPV6_INFOMSG_MASK)) 1551da177e4SLinus Torvalds return 1; 1561da177e4SLinus Torvalds } 1571da177e4SLinus Torvalds return 0; 1581da177e4SLinus Torvalds } 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds /* 1611da177e4SLinus Torvalds * Check the ICMP output rate limit 1621da177e4SLinus Torvalds */ 1631da177e4SLinus Torvalds static inline int icmpv6_xrlim_allow(struct sock *sk, int type, 1641da177e4SLinus Torvalds struct flowi *fl) 1651da177e4SLinus Torvalds { 1661da177e4SLinus Torvalds struct dst_entry *dst; 1673b1e0a65SYOSHIFUJI Hideaki struct net *net = sock_net(sk); 1681da177e4SLinus Torvalds int res = 0; 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds /* Informational messages are not limited. */ 1711da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 1721da177e4SLinus Torvalds return 1; 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds /* Do not limit pmtu discovery, it would break it. */ 1751da177e4SLinus Torvalds if (type == ICMPV6_PKT_TOOBIG) 1761da177e4SLinus Torvalds return 1; 1771da177e4SLinus Torvalds 1781da177e4SLinus Torvalds /* 1791da177e4SLinus Torvalds * Look up the output route. 1801da177e4SLinus Torvalds * XXX: perhaps the expire for routing entries cloned by 1811da177e4SLinus Torvalds * this lookup should be more aggressive (not longer than timeout). 1821da177e4SLinus Torvalds */ 1839a43b709SBenjamin Thery dst = ip6_route_output(net, sk, fl); 1841da177e4SLinus Torvalds if (dst->error) { 185a11d206dSYOSHIFUJI Hideaki IP6_INC_STATS(ip6_dst_idev(dst), 186a11d206dSYOSHIFUJI Hideaki IPSTATS_MIB_OUTNOROUTES); 1871da177e4SLinus Torvalds } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { 1881da177e4SLinus Torvalds res = 1; 1891da177e4SLinus Torvalds } else { 1901da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 1919a43b709SBenjamin Thery int tmo = net->ipv6.sysctl.icmpv6_time; 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds /* Give more bandwidth to wider prefixes. */ 1941da177e4SLinus Torvalds if (rt->rt6i_dst.plen < 128) 1951da177e4SLinus Torvalds tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds res = xrlim_allow(dst, tmo); 1981da177e4SLinus Torvalds } 1991da177e4SLinus Torvalds dst_release(dst); 2001da177e4SLinus Torvalds return res; 2011da177e4SLinus Torvalds } 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds /* 2041da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2051da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2061da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2071da177e4SLinus Torvalds * highest-order two bits set to 10 2081da177e4SLinus Torvalds */ 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds static __inline__ int opt_unrec(struct sk_buff *skb, __u32 offset) 2111da177e4SLinus Torvalds { 2121da177e4SLinus Torvalds u8 _optval, *op; 2131da177e4SLinus Torvalds 214bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2151da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 2161da177e4SLinus Torvalds if (op == NULL) 2171da177e4SLinus Torvalds return 1; 2181da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2191da177e4SLinus Torvalds } 2201da177e4SLinus Torvalds 2211da177e4SLinus Torvalds static int icmpv6_push_pending_frames(struct sock *sk, struct flowi *fl, struct icmp6hdr *thdr, int len) 2221da177e4SLinus Torvalds { 2231da177e4SLinus Torvalds struct sk_buff *skb; 2241da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2251da177e4SLinus Torvalds int err = 0; 2261da177e4SLinus Torvalds 2271da177e4SLinus Torvalds if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 2281da177e4SLinus Torvalds goto out; 2291da177e4SLinus Torvalds 230cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2311da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2321da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2331da177e4SLinus Torvalds 2341da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 2351da177e4SLinus Torvalds skb->csum = csum_partial((char *)icmp6h, 2361da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2371da177e4SLinus Torvalds icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src, 2381da177e4SLinus Torvalds &fl->fl6_dst, 2391da177e4SLinus Torvalds len, fl->proto, 2401da177e4SLinus Torvalds skb->csum); 2411da177e4SLinus Torvalds } else { 242868c86bcSAl Viro __wsum tmp_csum = 0; 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2451da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2461da177e4SLinus Torvalds } 2471da177e4SLinus Torvalds 2481da177e4SLinus Torvalds tmp_csum = csum_partial((char *)icmp6h, 2491da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 250868c86bcSAl Viro icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src, 2511da177e4SLinus Torvalds &fl->fl6_dst, 252868c86bcSAl Viro len, fl->proto, 253868c86bcSAl Viro tmp_csum); 2541da177e4SLinus Torvalds } 2551da177e4SLinus Torvalds ip6_push_pending_frames(sk); 2561da177e4SLinus Torvalds out: 2571da177e4SLinus Torvalds return err; 2581da177e4SLinus Torvalds } 2591da177e4SLinus Torvalds 2601da177e4SLinus Torvalds struct icmpv6_msg { 2611da177e4SLinus Torvalds struct sk_buff *skb; 2621da177e4SLinus Torvalds int offset; 263763ecff1SYasuyuki Kozakai uint8_t type; 2641da177e4SLinus Torvalds }; 2651da177e4SLinus Torvalds 2661da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 2671da177e4SLinus Torvalds { 2681da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 2691da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 2705f92a738SAl Viro __wsum csum = 0; 2711da177e4SLinus Torvalds 2721da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 2731da177e4SLinus Torvalds to, len, csum); 2741da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 275763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 276763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 2771da177e4SLinus Torvalds return 0; 2781da177e4SLinus Torvalds } 2791da177e4SLinus Torvalds 28059fbb3a6SMasahide NAKAMURA #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 28179383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 28279383236SMasahide NAKAMURA { 2830660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 28479383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 28579383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 28679383236SMasahide NAKAMURA struct in6_addr tmp; 28779383236SMasahide NAKAMURA int off; 28879383236SMasahide NAKAMURA 28979383236SMasahide NAKAMURA if (opt->dsthao) { 29079383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 29179383236SMasahide NAKAMURA if (likely(off >= 0)) { 292d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 293d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 29479383236SMasahide NAKAMURA ipv6_addr_copy(&tmp, &iph->saddr); 29579383236SMasahide NAKAMURA ipv6_addr_copy(&iph->saddr, &hao->addr); 29679383236SMasahide NAKAMURA ipv6_addr_copy(&hao->addr, &tmp); 29779383236SMasahide NAKAMURA } 29879383236SMasahide NAKAMURA } 29979383236SMasahide NAKAMURA } 30079383236SMasahide NAKAMURA #else 30179383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 30279383236SMasahide NAKAMURA #endif 30379383236SMasahide NAKAMURA 3041da177e4SLinus Torvalds /* 3051da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 3061da177e4SLinus Torvalds */ 3071da177e4SLinus Torvalds void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info, 3081da177e4SLinus Torvalds struct net_device *dev) 3091da177e4SLinus Torvalds { 310c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 3111da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 3120660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 31384427d53SYOSHIFUJI Hideaki struct sock *sk; 31484427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 3151da177e4SLinus Torvalds struct in6_addr *saddr = NULL; 3161da177e4SLinus Torvalds struct dst_entry *dst; 3178b7817f3SHerbert Xu struct dst_entry *dst2; 3181da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 3191da177e4SLinus Torvalds struct flowi fl; 3208b7817f3SHerbert Xu struct flowi fl2; 3211da177e4SLinus Torvalds struct icmpv6_msg msg; 3221da177e4SLinus Torvalds int iif = 0; 3231da177e4SLinus Torvalds int addr_type = 0; 3241da177e4SLinus Torvalds int len; 32541a1f8eaSYOSHIFUJI Hideaki int hlimit, tclass; 3261da177e4SLinus Torvalds int err = 0; 3271da177e4SLinus Torvalds 32827a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 32927a884dcSArnaldo Carvalho de Melo (skb->network_header + sizeof(*hdr)) > skb->tail) 3301da177e4SLinus Torvalds return; 3311da177e4SLinus Torvalds 3321da177e4SLinus Torvalds /* 3331da177e4SLinus Torvalds * Make sure we respect the rules 3341da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 3351da177e4SLinus Torvalds * Rule (e.1) is enforced by not using icmpv6_send 3361da177e4SLinus Torvalds * in any code that processes icmp errors. 3371da177e4SLinus Torvalds */ 3381da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 3391da177e4SLinus Torvalds 3409a43b709SBenjamin Thery if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0)) 3411da177e4SLinus Torvalds saddr = &hdr->daddr; 3421da177e4SLinus Torvalds 3431da177e4SLinus Torvalds /* 3441da177e4SLinus Torvalds * Dest addr check 3451da177e4SLinus Torvalds */ 3461da177e4SLinus Torvalds 3471da177e4SLinus Torvalds if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) { 3481da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 3491da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 3501da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 3511da177e4SLinus Torvalds (opt_unrec(skb, info)))) 3521da177e4SLinus Torvalds return; 3531da177e4SLinus Torvalds 3541da177e4SLinus Torvalds saddr = NULL; 3551da177e4SLinus Torvalds } 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 3581da177e4SLinus Torvalds 3591da177e4SLinus Torvalds /* 3601da177e4SLinus Torvalds * Source addr check 3611da177e4SLinus Torvalds */ 3621da177e4SLinus Torvalds 3631da177e4SLinus Torvalds if (addr_type & IPV6_ADDR_LINKLOCAL) 3641da177e4SLinus Torvalds iif = skb->dev->ifindex; 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvalds /* 3678de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 3688de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 3698de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 3708de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 3711da177e4SLinus Torvalds */ 3721da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 37364ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n"); 3741da177e4SLinus Torvalds return; 3751da177e4SLinus Torvalds } 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds /* 3781da177e4SLinus Torvalds * Never answer to a ICMP packet. 3791da177e4SLinus Torvalds */ 3801da177e4SLinus Torvalds if (is_ineligible(skb)) { 38164ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n"); 3821da177e4SLinus Torvalds return; 3831da177e4SLinus Torvalds } 3841da177e4SLinus Torvalds 38579383236SMasahide NAKAMURA mip6_addr_swap(skb); 38679383236SMasahide NAKAMURA 3871da177e4SLinus Torvalds memset(&fl, 0, sizeof(fl)); 3881da177e4SLinus Torvalds fl.proto = IPPROTO_ICMPV6; 3891da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_dst, &hdr->saddr); 3901da177e4SLinus Torvalds if (saddr) 3911da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_src, saddr); 3921da177e4SLinus Torvalds fl.oif = iif; 3931da177e4SLinus Torvalds fl.fl_icmp_type = type; 3941da177e4SLinus Torvalds fl.fl_icmp_code = code; 395beb8d13bSVenkat Yekkirala security_skb_classify_flow(skb, &fl); 3961da177e4SLinus Torvalds 3979a43b709SBenjamin Thery sk = icmpv6_sk(net); 39884427d53SYOSHIFUJI Hideaki np = inet6_sk(sk); 39984427d53SYOSHIFUJI Hideaki 400405666dbSDenis V. Lunev if (icmpv6_xmit_lock(sk)) 401405666dbSDenis V. Lunev return; 402405666dbSDenis V. Lunev 4031da177e4SLinus Torvalds if (!icmpv6_xrlim_allow(sk, type, &fl)) 4041da177e4SLinus Torvalds goto out; 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 4071da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 4081da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 4091da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 4101da177e4SLinus Torvalds 4111da177e4SLinus Torvalds if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 4121da177e4SLinus Torvalds fl.oif = np->mcast_oif; 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds err = ip6_dst_lookup(sk, &dst, &fl); 4151da177e4SLinus Torvalds if (err) 4161da177e4SLinus Torvalds goto out; 4178de3351eSYOSHIFUJI Hideaki 4188de3351eSYOSHIFUJI Hideaki /* 4198de3351eSYOSHIFUJI Hideaki * We won't send icmp if the destination is known 4208de3351eSYOSHIFUJI Hideaki * anycast. 4218de3351eSYOSHIFUJI Hideaki */ 4228de3351eSYOSHIFUJI Hideaki if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { 4238de3351eSYOSHIFUJI Hideaki LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n"); 4248de3351eSYOSHIFUJI Hideaki goto out_dst_release; 4258de3351eSYOSHIFUJI Hideaki } 4268de3351eSYOSHIFUJI Hideaki 4278b7817f3SHerbert Xu /* No need to clone since we're just using its address. */ 4288b7817f3SHerbert Xu dst2 = dst; 4298b7817f3SHerbert Xu 4308b7817f3SHerbert Xu err = xfrm_lookup(&dst, &fl, sk, 0); 4318b7817f3SHerbert Xu switch (err) { 4328b7817f3SHerbert Xu case 0: 4338b7817f3SHerbert Xu if (dst != dst2) 4348b7817f3SHerbert Xu goto route_done; 4358b7817f3SHerbert Xu break; 4368b7817f3SHerbert Xu case -EPERM: 4378b7817f3SHerbert Xu dst = NULL; 4388b7817f3SHerbert Xu break; 4398b7817f3SHerbert Xu default: 4408b7817f3SHerbert Xu goto out; 4418b7817f3SHerbert Xu } 4428b7817f3SHerbert Xu 4438b7817f3SHerbert Xu if (xfrm_decode_session_reverse(skb, &fl2, AF_INET6)) 444f32c5f2cSHerbert Xu goto out_dst_release; 4451da177e4SLinus Torvalds 4468b7817f3SHerbert Xu if (ip6_dst_lookup(sk, &dst2, &fl)) 447f32c5f2cSHerbert Xu goto out_dst_release; 4488b7817f3SHerbert Xu 4498b7817f3SHerbert Xu err = xfrm_lookup(&dst2, &fl, sk, XFRM_LOOKUP_ICMP); 4508b7817f3SHerbert Xu if (err == -ENOENT) { 4518b7817f3SHerbert Xu if (!dst) 4528b7817f3SHerbert Xu goto out; 4538b7817f3SHerbert Xu goto route_done; 4548b7817f3SHerbert Xu } 4558b7817f3SHerbert Xu 4568b7817f3SHerbert Xu dst_release(dst); 4578b7817f3SHerbert Xu dst = dst2; 4588b7817f3SHerbert Xu 4598b7817f3SHerbert Xu if (err) 4608b7817f3SHerbert Xu goto out; 4618b7817f3SHerbert Xu 4628b7817f3SHerbert Xu route_done: 4631da177e4SLinus Torvalds if (ipv6_addr_is_multicast(&fl.fl6_dst)) 4641da177e4SLinus Torvalds hlimit = np->mcast_hops; 4651da177e4SLinus Torvalds else 4661da177e4SLinus Torvalds hlimit = np->hop_limit; 4671da177e4SLinus Torvalds if (hlimit < 0) 4686b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 4691da177e4SLinus Torvalds 470e012d51cSYOSHIFUJI Hideaki tclass = np->tclass; 47141a1f8eaSYOSHIFUJI Hideaki if (tclass < 0) 47241a1f8eaSYOSHIFUJI Hideaki tclass = 0; 47341a1f8eaSYOSHIFUJI Hideaki 4741da177e4SLinus Torvalds msg.skb = skb; 475bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 476763ecff1SYasuyuki Kozakai msg.type = type; 4771da177e4SLinus Torvalds 4781da177e4SLinus Torvalds len = skb->len - msg.offset; 4791da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); 4801da177e4SLinus Torvalds if (len < 0) { 48164ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n"); 4821da177e4SLinus Torvalds goto out_dst_release; 4831da177e4SLinus Torvalds } 4841da177e4SLinus Torvalds 4851da177e4SLinus Torvalds idev = in6_dev_get(skb->dev); 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, 4881da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 4891da177e4SLinus Torvalds sizeof(struct icmp6hdr), 49041a1f8eaSYOSHIFUJI Hideaki hlimit, tclass, NULL, &fl, (struct rt6_info*)dst, 4911da177e4SLinus Torvalds MSG_DONTWAIT); 4921da177e4SLinus Torvalds if (err) { 4931da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 4941da177e4SLinus Torvalds goto out_put; 4951da177e4SLinus Torvalds } 4961da177e4SLinus Torvalds err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, len + sizeof(struct icmp6hdr)); 4971da177e4SLinus Torvalds 4981da177e4SLinus Torvalds out_put: 4991da177e4SLinus Torvalds if (likely(idev != NULL)) 5001da177e4SLinus Torvalds in6_dev_put(idev); 5011da177e4SLinus Torvalds out_dst_release: 5021da177e4SLinus Torvalds dst_release(dst); 5031da177e4SLinus Torvalds out: 504405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5051da177e4SLinus Torvalds } 5061da177e4SLinus Torvalds 5077159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_send); 5087159039aSYOSHIFUJI Hideaki 5091da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 5101da177e4SLinus Torvalds { 511c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 51284427d53SYOSHIFUJI Hideaki struct sock *sk; 5131da177e4SLinus Torvalds struct inet6_dev *idev; 51484427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 5151da177e4SLinus Torvalds struct in6_addr *saddr = NULL; 516cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 5171da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 5181da177e4SLinus Torvalds struct flowi fl; 5191da177e4SLinus Torvalds struct icmpv6_msg msg; 5201da177e4SLinus Torvalds struct dst_entry *dst; 5211da177e4SLinus Torvalds int err = 0; 5221da177e4SLinus Torvalds int hlimit; 52341a1f8eaSYOSHIFUJI Hideaki int tclass; 5241da177e4SLinus Torvalds 5250660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 5261da177e4SLinus Torvalds 5271da177e4SLinus Torvalds if (!ipv6_unicast_destination(skb)) 5281da177e4SLinus Torvalds saddr = NULL; 5291da177e4SLinus Torvalds 5301da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 5311da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 5321da177e4SLinus Torvalds 5331da177e4SLinus Torvalds memset(&fl, 0, sizeof(fl)); 5341da177e4SLinus Torvalds fl.proto = IPPROTO_ICMPV6; 5350660e03fSArnaldo Carvalho de Melo ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); 5361da177e4SLinus Torvalds if (saddr) 5371da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_src, saddr); 5381da177e4SLinus Torvalds fl.oif = skb->dev->ifindex; 5391da177e4SLinus Torvalds fl.fl_icmp_type = ICMPV6_ECHO_REPLY; 540beb8d13bSVenkat Yekkirala security_skb_classify_flow(skb, &fl); 5411da177e4SLinus Torvalds 5429a43b709SBenjamin Thery sk = icmpv6_sk(net); 54384427d53SYOSHIFUJI Hideaki np = inet6_sk(sk); 54484427d53SYOSHIFUJI Hideaki 545405666dbSDenis V. Lunev if (icmpv6_xmit_lock(sk)) 546405666dbSDenis V. Lunev return; 547405666dbSDenis V. Lunev 5481da177e4SLinus Torvalds if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 5491da177e4SLinus Torvalds fl.oif = np->mcast_oif; 5501da177e4SLinus Torvalds 5511da177e4SLinus Torvalds err = ip6_dst_lookup(sk, &dst, &fl); 5521da177e4SLinus Torvalds if (err) 5531da177e4SLinus Torvalds goto out; 5541da177e4SLinus Torvalds if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) 555e104411bSPatrick McHardy goto out; 5561da177e4SLinus Torvalds 5571da177e4SLinus Torvalds if (ipv6_addr_is_multicast(&fl.fl6_dst)) 5581da177e4SLinus Torvalds hlimit = np->mcast_hops; 5591da177e4SLinus Torvalds else 5601da177e4SLinus Torvalds hlimit = np->hop_limit; 5611da177e4SLinus Torvalds if (hlimit < 0) 5626b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 5631da177e4SLinus Torvalds 564e012d51cSYOSHIFUJI Hideaki tclass = np->tclass; 56541a1f8eaSYOSHIFUJI Hideaki if (tclass < 0) 56641a1f8eaSYOSHIFUJI Hideaki tclass = 0; 56741a1f8eaSYOSHIFUJI Hideaki 5681da177e4SLinus Torvalds idev = in6_dev_get(skb->dev); 5691da177e4SLinus Torvalds 5701da177e4SLinus Torvalds msg.skb = skb; 5711da177e4SLinus Torvalds msg.offset = 0; 572763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 57541a1f8eaSYOSHIFUJI Hideaki sizeof(struct icmp6hdr), hlimit, tclass, NULL, &fl, 5761da177e4SLinus Torvalds (struct rt6_info*)dst, MSG_DONTWAIT); 5771da177e4SLinus Torvalds 5781da177e4SLinus Torvalds if (err) { 5791da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 5801da177e4SLinus Torvalds goto out_put; 5811da177e4SLinus Torvalds } 5821da177e4SLinus Torvalds err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, skb->len + sizeof(struct icmp6hdr)); 5831da177e4SLinus Torvalds 5841da177e4SLinus Torvalds out_put: 5851da177e4SLinus Torvalds if (likely(idev != NULL)) 5861da177e4SLinus Torvalds in6_dev_put(idev); 5871da177e4SLinus Torvalds dst_release(dst); 5881da177e4SLinus Torvalds out: 589405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5901da177e4SLinus Torvalds } 5911da177e4SLinus Torvalds 59204ce6909SAl Viro static void icmpv6_notify(struct sk_buff *skb, int type, int code, __be32 info) 5931da177e4SLinus Torvalds { 5941da177e4SLinus Torvalds struct inet6_protocol *ipprot; 5951da177e4SLinus Torvalds int inner_offset; 5961da177e4SLinus Torvalds int hash; 5971da177e4SLinus Torvalds u8 nexthdr; 5981da177e4SLinus Torvalds 5991da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 6001da177e4SLinus Torvalds return; 6011da177e4SLinus Torvalds 6021da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 6031da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 6041da177e4SLinus Torvalds /* now skip over extension headers */ 6050d3d077cSHerbert Xu inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr); 6061da177e4SLinus Torvalds if (inner_offset<0) 6071da177e4SLinus Torvalds return; 6081da177e4SLinus Torvalds } else { 6091da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 6101da177e4SLinus Torvalds } 6111da177e4SLinus Torvalds 6121da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 6131da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 6141da177e4SLinus Torvalds return; 6151da177e4SLinus Torvalds 6161da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 6171da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 6181da177e4SLinus Torvalds pmtu discovery. 6191da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 6201da177e4SLinus Torvalds --ANK (980726) 6211da177e4SLinus Torvalds */ 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds hash = nexthdr & (MAX_INET_PROTOS - 1); 6241da177e4SLinus Torvalds 6251da177e4SLinus Torvalds rcu_read_lock(); 6261da177e4SLinus Torvalds ipprot = rcu_dereference(inet6_protos[hash]); 6271da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 6281da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 6291da177e4SLinus Torvalds rcu_read_unlock(); 6301da177e4SLinus Torvalds 63169d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 6321da177e4SLinus Torvalds } 6331da177e4SLinus Torvalds 6341da177e4SLinus Torvalds /* 6351da177e4SLinus Torvalds * Handle icmp messages 6361da177e4SLinus Torvalds */ 6371da177e4SLinus Torvalds 638e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 6391da177e4SLinus Torvalds { 6401da177e4SLinus Torvalds struct net_device *dev = skb->dev; 6411da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 6421da177e4SLinus Torvalds struct in6_addr *saddr, *daddr; 6431da177e4SLinus Torvalds struct ipv6hdr *orig_hdr; 6441da177e4SLinus Torvalds struct icmp6hdr *hdr; 6451da177e4SLinus Torvalds int type; 6461da177e4SLinus Torvalds 647aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 6488b7817f3SHerbert Xu int nh; 6498b7817f3SHerbert Xu 650aebcf82cSHerbert Xu if (!(skb->sp && skb->sp->xvec[skb->sp->len - 1]->props.flags & 651aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 652aebcf82cSHerbert Xu goto drop_no_count; 653aebcf82cSHerbert Xu 6548b7817f3SHerbert Xu if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(*orig_hdr))) 6558b7817f3SHerbert Xu goto drop_no_count; 6568b7817f3SHerbert Xu 6578b7817f3SHerbert Xu nh = skb_network_offset(skb); 6588b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 6598b7817f3SHerbert Xu 6608b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 6618b7817f3SHerbert Xu goto drop_no_count; 6628b7817f3SHerbert Xu 6638b7817f3SHerbert Xu skb_set_network_header(skb, nh); 6648b7817f3SHerbert Xu } 6658b7817f3SHerbert Xu 6661da177e4SLinus Torvalds ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INMSGS); 6671da177e4SLinus Torvalds 6680660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 6690660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 6701da177e4SLinus Torvalds 6711da177e4SLinus Torvalds /* Perform checksum. */ 672fb286bb2SHerbert Xu switch (skb->ip_summed) { 67384fa7933SPatrick McHardy case CHECKSUM_COMPLETE: 674fb286bb2SHerbert Xu if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, 675fb286bb2SHerbert Xu skb->csum)) 676fb286bb2SHerbert Xu break; 677fb286bb2SHerbert Xu /* fall through */ 678fb286bb2SHerbert Xu case CHECKSUM_NONE: 679868c86bcSAl Viro skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len, 680868c86bcSAl Viro IPPROTO_ICMPV6, 0)); 681fb286bb2SHerbert Xu if (__skb_checksum_complete(skb)) { 68246b86a2dSJoe Perches LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [" NIP6_FMT " > " NIP6_FMT "]\n", 68364ce2073SPatrick McHardy NIP6(*saddr), NIP6(*daddr)); 6841da177e4SLinus Torvalds goto discard_it; 6851da177e4SLinus Torvalds } 6861da177e4SLinus Torvalds } 6871da177e4SLinus Torvalds 6888cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 6898cf22943SHerbert Xu goto discard_it; 6901da177e4SLinus Torvalds 691cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 6921da177e4SLinus Torvalds 6931da177e4SLinus Torvalds type = hdr->icmp6_type; 6941da177e4SLinus Torvalds 69514878f75SDavid L Stevens ICMP6MSGIN_INC_STATS_BH(idev, type); 6961da177e4SLinus Torvalds 6971da177e4SLinus Torvalds switch (type) { 6981da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 6991da177e4SLinus Torvalds icmpv6_echo_reply(skb); 7001da177e4SLinus Torvalds break; 7011da177e4SLinus Torvalds 7021da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 7031da177e4SLinus Torvalds /* we couldn't care less */ 7041da177e4SLinus Torvalds break; 7051da177e4SLinus Torvalds 7061da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 7071da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 7081da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 7091da177e4SLinus Torvalds destination cache will allow to solve this problem 7101da177e4SLinus Torvalds --ANK (980726) 7111da177e4SLinus Torvalds */ 7121da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 7131da177e4SLinus Torvalds goto discard_it; 714cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 7151da177e4SLinus Torvalds orig_hdr = (struct ipv6hdr *) (hdr + 1); 7161da177e4SLinus Torvalds rt6_pmtu_discovery(&orig_hdr->daddr, &orig_hdr->saddr, dev, 7171da177e4SLinus Torvalds ntohl(hdr->icmp6_mtu)); 7181da177e4SLinus Torvalds 7191da177e4SLinus Torvalds /* 7201da177e4SLinus Torvalds * Drop through to notify 7211da177e4SLinus Torvalds */ 7221da177e4SLinus Torvalds 7231da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 7241da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 7251da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 7261da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7271da177e4SLinus Torvalds break; 7281da177e4SLinus Torvalds 7291da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 7301da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 7311da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 7321da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 7331da177e4SLinus Torvalds case NDISC_REDIRECT: 7341da177e4SLinus Torvalds ndisc_rcv(skb); 7351da177e4SLinus Torvalds break; 7361da177e4SLinus Torvalds 7371da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 7381da177e4SLinus Torvalds igmp6_event_query(skb); 7391da177e4SLinus Torvalds break; 7401da177e4SLinus Torvalds 7411da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 7421da177e4SLinus Torvalds igmp6_event_report(skb); 7431da177e4SLinus Torvalds break; 7441da177e4SLinus Torvalds 7451da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 7461da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 7471da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 7481da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 7491da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 7501da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 7511da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 7521da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 7531da177e4SLinus Torvalds break; 7541da177e4SLinus Torvalds 7551da177e4SLinus Torvalds default: 75664ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n"); 7571da177e4SLinus Torvalds 7581da177e4SLinus Torvalds /* informational */ 7591da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 7601da177e4SLinus Torvalds break; 7611da177e4SLinus Torvalds 7621da177e4SLinus Torvalds /* 7631da177e4SLinus Torvalds * error of unknown type. 7641da177e4SLinus Torvalds * must pass to upper level 7651da177e4SLinus Torvalds */ 7661da177e4SLinus Torvalds 7671da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7683ff50b79SStephen Hemminger } 7693ff50b79SStephen Hemminger 7701da177e4SLinus Torvalds kfree_skb(skb); 7711da177e4SLinus Torvalds return 0; 7721da177e4SLinus Torvalds 7731da177e4SLinus Torvalds discard_it: 7741da177e4SLinus Torvalds ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS); 7758b7817f3SHerbert Xu drop_no_count: 7761da177e4SLinus Torvalds kfree_skb(skb); 7771da177e4SLinus Torvalds return 0; 7781da177e4SLinus Torvalds } 7791da177e4SLinus Torvalds 78095e41e93SYOSHIFUJI Hideaki void icmpv6_flow_init(struct sock *sk, struct flowi *fl, 78195e41e93SYOSHIFUJI Hideaki u8 type, 78295e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 78395e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 78495e41e93SYOSHIFUJI Hideaki int oif) 78595e41e93SYOSHIFUJI Hideaki { 78695e41e93SYOSHIFUJI Hideaki memset(fl, 0, sizeof(*fl)); 78795e41e93SYOSHIFUJI Hideaki ipv6_addr_copy(&fl->fl6_src, saddr); 78895e41e93SYOSHIFUJI Hideaki ipv6_addr_copy(&fl->fl6_dst, daddr); 78995e41e93SYOSHIFUJI Hideaki fl->proto = IPPROTO_ICMPV6; 79095e41e93SYOSHIFUJI Hideaki fl->fl_icmp_type = type; 79195e41e93SYOSHIFUJI Hideaki fl->fl_icmp_code = 0; 79295e41e93SYOSHIFUJI Hideaki fl->oif = oif; 79395e41e93SYOSHIFUJI Hideaki security_sk_classify_flow(sk, fl); 79495e41e93SYOSHIFUJI Hideaki } 79595e41e93SYOSHIFUJI Hideaki 796640c41c7SIngo Molnar /* 797b7e729c4SDenis V. Lunev * Special lock-class for __icmpv6_sk: 798640c41c7SIngo Molnar */ 799640c41c7SIngo Molnar static struct lock_class_key icmpv6_socket_sk_dst_lock_key; 800640c41c7SIngo Molnar 80198c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 8021da177e4SLinus Torvalds { 8031da177e4SLinus Torvalds struct sock *sk; 8041da177e4SLinus Torvalds int err, i, j; 8051da177e4SLinus Torvalds 80698c6d1b2SDenis V. Lunev net->ipv6.icmp_sk = 80798c6d1b2SDenis V. Lunev kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); 80898c6d1b2SDenis V. Lunev if (net->ipv6.icmp_sk == NULL) 80979c91159SDenis V. Lunev return -ENOMEM; 81079c91159SDenis V. Lunev 8116f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8121ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 8131ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 8141da177e4SLinus Torvalds if (err < 0) { 8151da177e4SLinus Torvalds printk(KERN_ERR 8161da177e4SLinus Torvalds "Failed to initialize the ICMP6 control socket " 8171da177e4SLinus Torvalds "(err %d).\n", 8181da177e4SLinus Torvalds err); 8191da177e4SLinus Torvalds goto fail; 8201da177e4SLinus Torvalds } 8211da177e4SLinus Torvalds 8221ed8516fSDenis V. Lunev net->ipv6.icmp_sk[i] = sk; 8235c8cafd6SDenis V. Lunev 824640c41c7SIngo Molnar /* 825640c41c7SIngo Molnar * Split off their lock-class, because sk->sk_dst_lock 826640c41c7SIngo Molnar * gets used from softirqs, which is safe for 827b7e729c4SDenis V. Lunev * __icmpv6_sk (because those never get directly used 828640c41c7SIngo Molnar * via userspace syscalls), but unsafe for normal sockets. 829640c41c7SIngo Molnar */ 830640c41c7SIngo Molnar lockdep_set_class(&sk->sk_dst_lock, 831640c41c7SIngo Molnar &icmpv6_socket_sk_dst_lock_key); 8321da177e4SLinus Torvalds 8331da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 8341da177e4SLinus Torvalds * sk_buff struct overhead. 8351da177e4SLinus Torvalds */ 8361da177e4SLinus Torvalds sk->sk_sndbuf = 8371da177e4SLinus Torvalds (2 * ((64 * 1024) + sizeof(struct sk_buff))); 8381da177e4SLinus Torvalds } 8391da177e4SLinus Torvalds return 0; 8401da177e4SLinus Torvalds 8411da177e4SLinus Torvalds fail: 8425c8cafd6SDenis V. Lunev for (j = 0; j < i; j++) 8431ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); 84498c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 8451da177e4SLinus Torvalds return err; 8461da177e4SLinus Torvalds } 8471da177e4SLinus Torvalds 84898c6d1b2SDenis V. Lunev static void __net_exit icmpv6_sk_exit(struct net *net) 8491da177e4SLinus Torvalds { 8501da177e4SLinus Torvalds int i; 8511da177e4SLinus Torvalds 8526f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8531ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); 8541da177e4SLinus Torvalds } 85598c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 85698c6d1b2SDenis V. Lunev } 85798c6d1b2SDenis V. Lunev 8588ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 85998c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 86098c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 86198c6d1b2SDenis V. Lunev }; 86298c6d1b2SDenis V. Lunev 86398c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 86498c6d1b2SDenis V. Lunev { 86598c6d1b2SDenis V. Lunev int err; 86698c6d1b2SDenis V. Lunev 86798c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 86898c6d1b2SDenis V. Lunev if (err < 0) 86998c6d1b2SDenis V. Lunev return err; 87098c6d1b2SDenis V. Lunev 87198c6d1b2SDenis V. Lunev err = -EAGAIN; 87298c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 87398c6d1b2SDenis V. Lunev goto fail; 87498c6d1b2SDenis V. Lunev return 0; 87598c6d1b2SDenis V. Lunev 87698c6d1b2SDenis V. Lunev fail: 87798c6d1b2SDenis V. Lunev printk(KERN_ERR "Failed to register ICMP6 protocol\n"); 87898c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 87998c6d1b2SDenis V. Lunev return err; 88098c6d1b2SDenis V. Lunev } 88198c6d1b2SDenis V. Lunev 8828ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 88398c6d1b2SDenis V. Lunev { 88498c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 8851da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 8861da177e4SLinus Torvalds } 8871da177e4SLinus Torvalds 88898c6d1b2SDenis V. Lunev 8899b5b5cffSArjan van de Ven static const struct icmp6_err { 8901da177e4SLinus Torvalds int err; 8911da177e4SLinus Torvalds int fatal; 8921da177e4SLinus Torvalds } tab_unreach[] = { 8931da177e4SLinus Torvalds { /* NOROUTE */ 8941da177e4SLinus Torvalds .err = ENETUNREACH, 8951da177e4SLinus Torvalds .fatal = 0, 8961da177e4SLinus Torvalds }, 8971da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 8981da177e4SLinus Torvalds .err = EACCES, 8991da177e4SLinus Torvalds .fatal = 1, 9001da177e4SLinus Torvalds }, 9011da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 9021da177e4SLinus Torvalds .err = EHOSTUNREACH, 9031da177e4SLinus Torvalds .fatal = 0, 9041da177e4SLinus Torvalds }, 9051da177e4SLinus Torvalds { /* ADDR_UNREACH */ 9061da177e4SLinus Torvalds .err = EHOSTUNREACH, 9071da177e4SLinus Torvalds .fatal = 0, 9081da177e4SLinus Torvalds }, 9091da177e4SLinus Torvalds { /* PORT_UNREACH */ 9101da177e4SLinus Torvalds .err = ECONNREFUSED, 9111da177e4SLinus Torvalds .fatal = 1, 9121da177e4SLinus Torvalds }, 9131da177e4SLinus Torvalds }; 9141da177e4SLinus Torvalds 9151da177e4SLinus Torvalds int icmpv6_err_convert(int type, int code, int *err) 9161da177e4SLinus Torvalds { 9171da177e4SLinus Torvalds int fatal = 0; 9181da177e4SLinus Torvalds 9191da177e4SLinus Torvalds *err = EPROTO; 9201da177e4SLinus Torvalds 9211da177e4SLinus Torvalds switch (type) { 9221da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 9231da177e4SLinus Torvalds fatal = 1; 9241da177e4SLinus Torvalds if (code <= ICMPV6_PORT_UNREACH) { 9251da177e4SLinus Torvalds *err = tab_unreach[code].err; 9261da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 9271da177e4SLinus Torvalds } 9281da177e4SLinus Torvalds break; 9291da177e4SLinus Torvalds 9301da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 9311da177e4SLinus Torvalds *err = EMSGSIZE; 9321da177e4SLinus Torvalds break; 9331da177e4SLinus Torvalds 9341da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 9351da177e4SLinus Torvalds *err = EPROTO; 9361da177e4SLinus Torvalds fatal = 1; 9371da177e4SLinus Torvalds break; 9381da177e4SLinus Torvalds 9391da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 9401da177e4SLinus Torvalds *err = EHOSTUNREACH; 9411da177e4SLinus Torvalds break; 9423ff50b79SStephen Hemminger } 9431da177e4SLinus Torvalds 9441da177e4SLinus Torvalds return fatal; 9451da177e4SLinus Torvalds } 9461da177e4SLinus Torvalds 9477159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 9487159039aSYOSHIFUJI Hideaki 9491da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 950760f2d01SDaniel Lezcano ctl_table ipv6_icmp_table_template[] = { 9511da177e4SLinus Torvalds { 9521da177e4SLinus Torvalds .ctl_name = NET_IPV6_ICMP_RATELIMIT, 9531da177e4SLinus Torvalds .procname = "ratelimit", 95441a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 9551da177e4SLinus Torvalds .maxlen = sizeof(int), 9561da177e4SLinus Torvalds .mode = 0644, 9571da177e4SLinus Torvalds .proc_handler = &proc_dointvec 9581da177e4SLinus Torvalds }, 9591da177e4SLinus Torvalds { .ctl_name = 0 }, 9601da177e4SLinus Torvalds }; 961760f2d01SDaniel Lezcano 962760f2d01SDaniel Lezcano struct ctl_table *ipv6_icmp_sysctl_init(struct net *net) 963760f2d01SDaniel Lezcano { 964760f2d01SDaniel Lezcano struct ctl_table *table; 965760f2d01SDaniel Lezcano 966760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 967760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 968760f2d01SDaniel Lezcano GFP_KERNEL); 9695ee09105SYOSHIFUJI Hideaki 9705ee09105SYOSHIFUJI Hideaki if (table) 9715ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 9725ee09105SYOSHIFUJI Hideaki 973760f2d01SDaniel Lezcano return table; 974760f2d01SDaniel Lezcano } 9751da177e4SLinus Torvalds #endif 9761da177e4SLinus Torvalds 977