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> 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds #include <asm/uaccess.h> 691da177e4SLinus Torvalds #include <asm/system.h> 701da177e4SLinus Torvalds 71ba89966cSEric Dumazet DEFINE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics) __read_mostly; 727159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_statistics); 7314878f75SDavid L Stevens DEFINE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics) __read_mostly; 7414878f75SDavid L Stevens EXPORT_SYMBOL(icmpv6msg_statistics); 751da177e4SLinus Torvalds 761da177e4SLinus Torvalds /* 771da177e4SLinus Torvalds * The ICMP socket(s). This is the most convenient way to flow control 781da177e4SLinus Torvalds * our ICMP output as well as maintain a clean interface throughout 791da177e4SLinus Torvalds * all layers. All Socketless IP sends will soon be gone. 801da177e4SLinus Torvalds * 811da177e4SLinus Torvalds * On SMP we have one ICMP socket per-cpu. 821da177e4SLinus Torvalds */ 8398c6d1b2SDenis V. Lunev static inline struct sock *icmpv6_sk(struct net *net) 8498c6d1b2SDenis V. Lunev { 8598c6d1b2SDenis V. Lunev return net->ipv6.icmp_sk[smp_processor_id()]; 8698c6d1b2SDenis V. Lunev } 871da177e4SLinus Torvalds 88e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb); 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds static struct inet6_protocol icmpv6_protocol = { 911da177e4SLinus Torvalds .handler = icmpv6_rcv, 928b7817f3SHerbert Xu .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 931da177e4SLinus Torvalds }; 941da177e4SLinus Torvalds 95405666dbSDenis V. Lunev static __inline__ int icmpv6_xmit_lock(struct sock *sk) 961da177e4SLinus Torvalds { 971da177e4SLinus Torvalds local_bh_disable(); 981da177e4SLinus Torvalds 99405666dbSDenis V. Lunev if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { 1001da177e4SLinus Torvalds /* This can happen if the output path (f.e. SIT or 1011da177e4SLinus Torvalds * ip6ip6 tunnel) signals dst_link_failure() for an 1021da177e4SLinus Torvalds * outgoing ICMP6 packet. 1031da177e4SLinus Torvalds */ 1041da177e4SLinus Torvalds local_bh_enable(); 1051da177e4SLinus Torvalds return 1; 1061da177e4SLinus Torvalds } 1071da177e4SLinus Torvalds return 0; 1081da177e4SLinus Torvalds } 1091da177e4SLinus Torvalds 110405666dbSDenis V. Lunev static __inline__ void icmpv6_xmit_unlock(struct sock *sk) 1111da177e4SLinus Torvalds { 112405666dbSDenis V. Lunev spin_unlock_bh(&sk->sk_lock.slock); 1131da177e4SLinus Torvalds } 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds /* 1161da177e4SLinus Torvalds * Slightly more convenient version of icmpv6_send. 1171da177e4SLinus Torvalds */ 1181da177e4SLinus Torvalds void icmpv6_param_prob(struct sk_buff *skb, int code, int pos) 1191da177e4SLinus Torvalds { 1201da177e4SLinus Torvalds icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos, skb->dev); 1211da177e4SLinus Torvalds kfree_skb(skb); 1221da177e4SLinus Torvalds } 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds /* 1251da177e4SLinus Torvalds * Figure out, may we reply to this packet with icmp error. 1261da177e4SLinus Torvalds * 1271da177e4SLinus Torvalds * We do not reply, if: 1281da177e4SLinus Torvalds * - it was icmp error message. 1291da177e4SLinus Torvalds * - it is truncated, so that it is known, that protocol is ICMPV6 1301da177e4SLinus Torvalds * (i.e. in the middle of some exthdr) 1311da177e4SLinus Torvalds * 1321da177e4SLinus Torvalds * --ANK (980726) 1331da177e4SLinus Torvalds */ 1341da177e4SLinus Torvalds 1351da177e4SLinus Torvalds static int is_ineligible(struct sk_buff *skb) 1361da177e4SLinus Torvalds { 1370660e03fSArnaldo Carvalho de Melo int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; 1381da177e4SLinus Torvalds int len = skb->len - ptr; 1390660e03fSArnaldo Carvalho de Melo __u8 nexthdr = ipv6_hdr(skb)->nexthdr; 1401da177e4SLinus Torvalds 1411da177e4SLinus Torvalds if (len < 0) 1421da177e4SLinus Torvalds return 1; 1431da177e4SLinus Torvalds 1440d3d077cSHerbert Xu ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr); 1451da177e4SLinus Torvalds if (ptr < 0) 1461da177e4SLinus Torvalds return 0; 1471da177e4SLinus Torvalds if (nexthdr == IPPROTO_ICMPV6) { 1481da177e4SLinus Torvalds u8 _type, *tp; 1491da177e4SLinus Torvalds tp = skb_header_pointer(skb, 1501da177e4SLinus Torvalds ptr+offsetof(struct icmp6hdr, icmp6_type), 1511da177e4SLinus Torvalds sizeof(_type), &_type); 1521da177e4SLinus Torvalds if (tp == NULL || 1531da177e4SLinus Torvalds !(*tp & ICMPV6_INFOMSG_MASK)) 1541da177e4SLinus Torvalds return 1; 1551da177e4SLinus Torvalds } 1561da177e4SLinus Torvalds return 0; 1571da177e4SLinus Torvalds } 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds /* 1601da177e4SLinus Torvalds * Check the ICMP output rate limit 1611da177e4SLinus Torvalds */ 1621da177e4SLinus Torvalds static inline int icmpv6_xrlim_allow(struct sock *sk, int type, 1631da177e4SLinus Torvalds struct flowi *fl) 1641da177e4SLinus Torvalds { 1651da177e4SLinus Torvalds struct dst_entry *dst; 1669a43b709SBenjamin Thery struct net *net = sk->sk_net; 1671da177e4SLinus Torvalds int res = 0; 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvalds /* Informational messages are not limited. */ 1701da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 1711da177e4SLinus Torvalds return 1; 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds /* Do not limit pmtu discovery, it would break it. */ 1741da177e4SLinus Torvalds if (type == ICMPV6_PKT_TOOBIG) 1751da177e4SLinus Torvalds return 1; 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds /* 1781da177e4SLinus Torvalds * Look up the output route. 1791da177e4SLinus Torvalds * XXX: perhaps the expire for routing entries cloned by 1801da177e4SLinus Torvalds * this lookup should be more aggressive (not longer than timeout). 1811da177e4SLinus Torvalds */ 1829a43b709SBenjamin Thery dst = ip6_route_output(net, sk, fl); 1831da177e4SLinus Torvalds if (dst->error) { 184a11d206dSYOSHIFUJI Hideaki IP6_INC_STATS(ip6_dst_idev(dst), 185a11d206dSYOSHIFUJI Hideaki IPSTATS_MIB_OUTNOROUTES); 1861da177e4SLinus Torvalds } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { 1871da177e4SLinus Torvalds res = 1; 1881da177e4SLinus Torvalds } else { 1891da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 1909a43b709SBenjamin Thery int tmo = net->ipv6.sysctl.icmpv6_time; 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds /* Give more bandwidth to wider prefixes. */ 1931da177e4SLinus Torvalds if (rt->rt6i_dst.plen < 128) 1941da177e4SLinus Torvalds tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds res = xrlim_allow(dst, tmo); 1971da177e4SLinus Torvalds } 1981da177e4SLinus Torvalds dst_release(dst); 1991da177e4SLinus Torvalds return res; 2001da177e4SLinus Torvalds } 2011da177e4SLinus Torvalds 2021da177e4SLinus Torvalds /* 2031da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2041da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2051da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2061da177e4SLinus Torvalds * highest-order two bits set to 10 2071da177e4SLinus Torvalds */ 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds static __inline__ int opt_unrec(struct sk_buff *skb, __u32 offset) 2101da177e4SLinus Torvalds { 2111da177e4SLinus Torvalds u8 _optval, *op; 2121da177e4SLinus Torvalds 213bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2141da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 2151da177e4SLinus Torvalds if (op == NULL) 2161da177e4SLinus Torvalds return 1; 2171da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2181da177e4SLinus Torvalds } 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds static int icmpv6_push_pending_frames(struct sock *sk, struct flowi *fl, struct icmp6hdr *thdr, int len) 2211da177e4SLinus Torvalds { 2221da177e4SLinus Torvalds struct sk_buff *skb; 2231da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2241da177e4SLinus Torvalds int err = 0; 2251da177e4SLinus Torvalds 2261da177e4SLinus Torvalds if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 2271da177e4SLinus Torvalds goto out; 2281da177e4SLinus Torvalds 229cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2301da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2311da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2321da177e4SLinus Torvalds 2331da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 2341da177e4SLinus Torvalds skb->csum = csum_partial((char *)icmp6h, 2351da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2361da177e4SLinus Torvalds icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src, 2371da177e4SLinus Torvalds &fl->fl6_dst, 2381da177e4SLinus Torvalds len, fl->proto, 2391da177e4SLinus Torvalds skb->csum); 2401da177e4SLinus Torvalds } else { 241868c86bcSAl Viro __wsum tmp_csum = 0; 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2441da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2451da177e4SLinus Torvalds } 2461da177e4SLinus Torvalds 2471da177e4SLinus Torvalds tmp_csum = csum_partial((char *)icmp6h, 2481da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 249868c86bcSAl Viro icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src, 2501da177e4SLinus Torvalds &fl->fl6_dst, 251868c86bcSAl Viro len, fl->proto, 252868c86bcSAl Viro tmp_csum); 2531da177e4SLinus Torvalds } 2541da177e4SLinus Torvalds ip6_push_pending_frames(sk); 2551da177e4SLinus Torvalds out: 2561da177e4SLinus Torvalds return err; 2571da177e4SLinus Torvalds } 2581da177e4SLinus Torvalds 2591da177e4SLinus Torvalds struct icmpv6_msg { 2601da177e4SLinus Torvalds struct sk_buff *skb; 2611da177e4SLinus Torvalds int offset; 262763ecff1SYasuyuki Kozakai uint8_t type; 2631da177e4SLinus Torvalds }; 2641da177e4SLinus Torvalds 2651da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 2661da177e4SLinus Torvalds { 2671da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 2681da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 2695f92a738SAl Viro __wsum csum = 0; 2701da177e4SLinus Torvalds 2711da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 2721da177e4SLinus Torvalds to, len, csum); 2731da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 274763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 275763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 2761da177e4SLinus Torvalds return 0; 2771da177e4SLinus Torvalds } 2781da177e4SLinus Torvalds 27959fbb3a6SMasahide NAKAMURA #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 28079383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 28179383236SMasahide NAKAMURA { 2820660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 28379383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 28479383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 28579383236SMasahide NAKAMURA struct in6_addr tmp; 28679383236SMasahide NAKAMURA int off; 28779383236SMasahide NAKAMURA 28879383236SMasahide NAKAMURA if (opt->dsthao) { 28979383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 29079383236SMasahide NAKAMURA if (likely(off >= 0)) { 291d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 292d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 29379383236SMasahide NAKAMURA ipv6_addr_copy(&tmp, &iph->saddr); 29479383236SMasahide NAKAMURA ipv6_addr_copy(&iph->saddr, &hao->addr); 29579383236SMasahide NAKAMURA ipv6_addr_copy(&hao->addr, &tmp); 29679383236SMasahide NAKAMURA } 29779383236SMasahide NAKAMURA } 29879383236SMasahide NAKAMURA } 29979383236SMasahide NAKAMURA #else 30079383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 30179383236SMasahide NAKAMURA #endif 30279383236SMasahide NAKAMURA 3031da177e4SLinus Torvalds /* 3041da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 3051da177e4SLinus Torvalds */ 3061da177e4SLinus Torvalds void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info, 3071da177e4SLinus Torvalds struct net_device *dev) 3081da177e4SLinus Torvalds { 3099a43b709SBenjamin Thery struct net *net = skb->dev->nd_net; 3101da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 3110660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 31284427d53SYOSHIFUJI Hideaki struct sock *sk; 31384427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 3141da177e4SLinus Torvalds struct in6_addr *saddr = NULL; 3151da177e4SLinus Torvalds struct dst_entry *dst; 3168b7817f3SHerbert Xu struct dst_entry *dst2; 3171da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 3181da177e4SLinus Torvalds struct flowi fl; 3198b7817f3SHerbert Xu struct flowi fl2; 3201da177e4SLinus Torvalds struct icmpv6_msg msg; 3211da177e4SLinus Torvalds int iif = 0; 3221da177e4SLinus Torvalds int addr_type = 0; 3231da177e4SLinus Torvalds int len; 32441a1f8eaSYOSHIFUJI Hideaki int hlimit, tclass; 3251da177e4SLinus Torvalds int err = 0; 3261da177e4SLinus Torvalds 32727a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 32827a884dcSArnaldo Carvalho de Melo (skb->network_header + sizeof(*hdr)) > skb->tail) 3291da177e4SLinus Torvalds return; 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds /* 3321da177e4SLinus Torvalds * Make sure we respect the rules 3331da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 3341da177e4SLinus Torvalds * Rule (e.1) is enforced by not using icmpv6_send 3351da177e4SLinus Torvalds * in any code that processes icmp errors. 3361da177e4SLinus Torvalds */ 3371da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 3381da177e4SLinus Torvalds 3399a43b709SBenjamin Thery if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0)) 3401da177e4SLinus Torvalds saddr = &hdr->daddr; 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds /* 3431da177e4SLinus Torvalds * Dest addr check 3441da177e4SLinus Torvalds */ 3451da177e4SLinus Torvalds 3461da177e4SLinus Torvalds if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) { 3471da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 3481da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 3491da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 3501da177e4SLinus Torvalds (opt_unrec(skb, info)))) 3511da177e4SLinus Torvalds return; 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds saddr = NULL; 3541da177e4SLinus Torvalds } 3551da177e4SLinus Torvalds 3561da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvalds /* 3591da177e4SLinus Torvalds * Source addr check 3601da177e4SLinus Torvalds */ 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds if (addr_type & IPV6_ADDR_LINKLOCAL) 3631da177e4SLinus Torvalds iif = skb->dev->ifindex; 3641da177e4SLinus Torvalds 3651da177e4SLinus Torvalds /* 3668de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 3678de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 3688de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 3698de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 3701da177e4SLinus Torvalds */ 3711da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 37264ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n"); 3731da177e4SLinus Torvalds return; 3741da177e4SLinus Torvalds } 3751da177e4SLinus Torvalds 3761da177e4SLinus Torvalds /* 3771da177e4SLinus Torvalds * Never answer to a ICMP packet. 3781da177e4SLinus Torvalds */ 3791da177e4SLinus Torvalds if (is_ineligible(skb)) { 38064ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n"); 3811da177e4SLinus Torvalds return; 3821da177e4SLinus Torvalds } 3831da177e4SLinus Torvalds 38479383236SMasahide NAKAMURA mip6_addr_swap(skb); 38579383236SMasahide NAKAMURA 3861da177e4SLinus Torvalds memset(&fl, 0, sizeof(fl)); 3871da177e4SLinus Torvalds fl.proto = IPPROTO_ICMPV6; 3881da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_dst, &hdr->saddr); 3891da177e4SLinus Torvalds if (saddr) 3901da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_src, saddr); 3911da177e4SLinus Torvalds fl.oif = iif; 3921da177e4SLinus Torvalds fl.fl_icmp_type = type; 3931da177e4SLinus Torvalds fl.fl_icmp_code = code; 394beb8d13bSVenkat Yekkirala security_skb_classify_flow(skb, &fl); 3951da177e4SLinus Torvalds 3969a43b709SBenjamin Thery sk = icmpv6_sk(net); 39784427d53SYOSHIFUJI Hideaki np = inet6_sk(sk); 39884427d53SYOSHIFUJI Hideaki 399405666dbSDenis V. Lunev if (icmpv6_xmit_lock(sk)) 400405666dbSDenis V. Lunev return; 401405666dbSDenis V. Lunev 4021da177e4SLinus Torvalds if (!icmpv6_xrlim_allow(sk, type, &fl)) 4031da177e4SLinus Torvalds goto out; 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 4061da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 4071da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 4081da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 4091da177e4SLinus Torvalds 4101da177e4SLinus Torvalds if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 4111da177e4SLinus Torvalds fl.oif = np->mcast_oif; 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds err = ip6_dst_lookup(sk, &dst, &fl); 4141da177e4SLinus Torvalds if (err) 4151da177e4SLinus Torvalds goto out; 4168de3351eSYOSHIFUJI Hideaki 4178de3351eSYOSHIFUJI Hideaki /* 4188de3351eSYOSHIFUJI Hideaki * We won't send icmp if the destination is known 4198de3351eSYOSHIFUJI Hideaki * anycast. 4208de3351eSYOSHIFUJI Hideaki */ 4218de3351eSYOSHIFUJI Hideaki if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { 4228de3351eSYOSHIFUJI Hideaki LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n"); 4238de3351eSYOSHIFUJI Hideaki goto out_dst_release; 4248de3351eSYOSHIFUJI Hideaki } 4258de3351eSYOSHIFUJI Hideaki 4268b7817f3SHerbert Xu /* No need to clone since we're just using its address. */ 4278b7817f3SHerbert Xu dst2 = dst; 4288b7817f3SHerbert Xu 4298b7817f3SHerbert Xu err = xfrm_lookup(&dst, &fl, sk, 0); 4308b7817f3SHerbert Xu switch (err) { 4318b7817f3SHerbert Xu case 0: 4328b7817f3SHerbert Xu if (dst != dst2) 4338b7817f3SHerbert Xu goto route_done; 4348b7817f3SHerbert Xu break; 4358b7817f3SHerbert Xu case -EPERM: 4368b7817f3SHerbert Xu dst = NULL; 4378b7817f3SHerbert Xu break; 4388b7817f3SHerbert Xu default: 4398b7817f3SHerbert Xu goto out; 4408b7817f3SHerbert Xu } 4418b7817f3SHerbert Xu 4428b7817f3SHerbert Xu if (xfrm_decode_session_reverse(skb, &fl2, AF_INET6)) 443e104411bSPatrick McHardy goto out; 4441da177e4SLinus Torvalds 4458b7817f3SHerbert Xu if (ip6_dst_lookup(sk, &dst2, &fl)) 4468b7817f3SHerbert Xu goto out; 4478b7817f3SHerbert Xu 4488b7817f3SHerbert Xu err = xfrm_lookup(&dst2, &fl, sk, XFRM_LOOKUP_ICMP); 4498b7817f3SHerbert Xu if (err == -ENOENT) { 4508b7817f3SHerbert Xu if (!dst) 4518b7817f3SHerbert Xu goto out; 4528b7817f3SHerbert Xu goto route_done; 4538b7817f3SHerbert Xu } 4548b7817f3SHerbert Xu 4558b7817f3SHerbert Xu dst_release(dst); 4568b7817f3SHerbert Xu dst = dst2; 4578b7817f3SHerbert Xu 4588b7817f3SHerbert Xu if (err) 4598b7817f3SHerbert Xu goto out; 4608b7817f3SHerbert Xu 4618b7817f3SHerbert Xu route_done: 4621da177e4SLinus Torvalds if (ipv6_addr_is_multicast(&fl.fl6_dst)) 4631da177e4SLinus Torvalds hlimit = np->mcast_hops; 4641da177e4SLinus Torvalds else 4651da177e4SLinus Torvalds hlimit = np->hop_limit; 4661da177e4SLinus Torvalds if (hlimit < 0) 4671da177e4SLinus Torvalds hlimit = dst_metric(dst, RTAX_HOPLIMIT); 4681da177e4SLinus Torvalds if (hlimit < 0) 4691da177e4SLinus Torvalds hlimit = ipv6_get_hoplimit(dst->dev); 4701da177e4SLinus Torvalds 471e012d51cSYOSHIFUJI Hideaki tclass = np->tclass; 47241a1f8eaSYOSHIFUJI Hideaki if (tclass < 0) 47341a1f8eaSYOSHIFUJI Hideaki tclass = 0; 47441a1f8eaSYOSHIFUJI Hideaki 4751da177e4SLinus Torvalds msg.skb = skb; 476bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 477763ecff1SYasuyuki Kozakai msg.type = type; 4781da177e4SLinus Torvalds 4791da177e4SLinus Torvalds len = skb->len - msg.offset; 4801da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); 4811da177e4SLinus Torvalds if (len < 0) { 48264ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n"); 4831da177e4SLinus Torvalds goto out_dst_release; 4841da177e4SLinus Torvalds } 4851da177e4SLinus Torvalds 4861da177e4SLinus Torvalds idev = in6_dev_get(skb->dev); 4871da177e4SLinus Torvalds 4881da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, 4891da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 4901da177e4SLinus Torvalds sizeof(struct icmp6hdr), 49141a1f8eaSYOSHIFUJI Hideaki hlimit, tclass, NULL, &fl, (struct rt6_info*)dst, 4921da177e4SLinus Torvalds MSG_DONTWAIT); 4931da177e4SLinus Torvalds if (err) { 4941da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 4951da177e4SLinus Torvalds goto out_put; 4961da177e4SLinus Torvalds } 4971da177e4SLinus Torvalds err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, len + sizeof(struct icmp6hdr)); 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds out_put: 5001da177e4SLinus Torvalds if (likely(idev != NULL)) 5011da177e4SLinus Torvalds in6_dev_put(idev); 5021da177e4SLinus Torvalds out_dst_release: 5031da177e4SLinus Torvalds dst_release(dst); 5041da177e4SLinus Torvalds out: 505405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5061da177e4SLinus Torvalds } 5071da177e4SLinus Torvalds 5087159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_send); 5097159039aSYOSHIFUJI Hideaki 5101da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 5111da177e4SLinus Torvalds { 5129a43b709SBenjamin Thery struct net *net = skb->dev->nd_net; 51384427d53SYOSHIFUJI Hideaki struct sock *sk; 5141da177e4SLinus Torvalds struct inet6_dev *idev; 51584427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 5161da177e4SLinus Torvalds struct in6_addr *saddr = NULL; 517cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 5181da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 5191da177e4SLinus Torvalds struct flowi fl; 5201da177e4SLinus Torvalds struct icmpv6_msg msg; 5211da177e4SLinus Torvalds struct dst_entry *dst; 5221da177e4SLinus Torvalds int err = 0; 5231da177e4SLinus Torvalds int hlimit; 52441a1f8eaSYOSHIFUJI Hideaki int tclass; 5251da177e4SLinus Torvalds 5260660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 5271da177e4SLinus Torvalds 5281da177e4SLinus Torvalds if (!ipv6_unicast_destination(skb)) 5291da177e4SLinus Torvalds saddr = NULL; 5301da177e4SLinus Torvalds 5311da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 5321da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 5331da177e4SLinus Torvalds 5341da177e4SLinus Torvalds memset(&fl, 0, sizeof(fl)); 5351da177e4SLinus Torvalds fl.proto = IPPROTO_ICMPV6; 5360660e03fSArnaldo Carvalho de Melo ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); 5371da177e4SLinus Torvalds if (saddr) 5381da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_src, saddr); 5391da177e4SLinus Torvalds fl.oif = skb->dev->ifindex; 5401da177e4SLinus Torvalds fl.fl_icmp_type = ICMPV6_ECHO_REPLY; 541beb8d13bSVenkat Yekkirala security_skb_classify_flow(skb, &fl); 5421da177e4SLinus Torvalds 5439a43b709SBenjamin Thery sk = icmpv6_sk(net); 54484427d53SYOSHIFUJI Hideaki np = inet6_sk(sk); 54584427d53SYOSHIFUJI Hideaki 546405666dbSDenis V. Lunev if (icmpv6_xmit_lock(sk)) 547405666dbSDenis V. Lunev return; 548405666dbSDenis V. Lunev 5491da177e4SLinus Torvalds if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 5501da177e4SLinus Torvalds fl.oif = np->mcast_oif; 5511da177e4SLinus Torvalds 5521da177e4SLinus Torvalds err = ip6_dst_lookup(sk, &dst, &fl); 5531da177e4SLinus Torvalds if (err) 5541da177e4SLinus Torvalds goto out; 5551da177e4SLinus Torvalds if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) 556e104411bSPatrick McHardy goto out; 5571da177e4SLinus Torvalds 5581da177e4SLinus Torvalds if (ipv6_addr_is_multicast(&fl.fl6_dst)) 5591da177e4SLinus Torvalds hlimit = np->mcast_hops; 5601da177e4SLinus Torvalds else 5611da177e4SLinus Torvalds hlimit = np->hop_limit; 5621da177e4SLinus Torvalds if (hlimit < 0) 5631da177e4SLinus Torvalds hlimit = dst_metric(dst, RTAX_HOPLIMIT); 5641da177e4SLinus Torvalds if (hlimit < 0) 5651da177e4SLinus Torvalds hlimit = ipv6_get_hoplimit(dst->dev); 5661da177e4SLinus Torvalds 567e012d51cSYOSHIFUJI Hideaki tclass = np->tclass; 56841a1f8eaSYOSHIFUJI Hideaki if (tclass < 0) 56941a1f8eaSYOSHIFUJI Hideaki tclass = 0; 57041a1f8eaSYOSHIFUJI Hideaki 5711da177e4SLinus Torvalds idev = in6_dev_get(skb->dev); 5721da177e4SLinus Torvalds 5731da177e4SLinus Torvalds msg.skb = skb; 5741da177e4SLinus Torvalds msg.offset = 0; 575763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 5761da177e4SLinus Torvalds 5771da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 57841a1f8eaSYOSHIFUJI Hideaki sizeof(struct icmp6hdr), hlimit, tclass, NULL, &fl, 5791da177e4SLinus Torvalds (struct rt6_info*)dst, MSG_DONTWAIT); 5801da177e4SLinus Torvalds 5811da177e4SLinus Torvalds if (err) { 5821da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 5831da177e4SLinus Torvalds goto out_put; 5841da177e4SLinus Torvalds } 5851da177e4SLinus Torvalds err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, skb->len + sizeof(struct icmp6hdr)); 5861da177e4SLinus Torvalds 5871da177e4SLinus Torvalds out_put: 5881da177e4SLinus Torvalds if (likely(idev != NULL)) 5891da177e4SLinus Torvalds in6_dev_put(idev); 5901da177e4SLinus Torvalds dst_release(dst); 5911da177e4SLinus Torvalds out: 592405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5931da177e4SLinus Torvalds } 5941da177e4SLinus Torvalds 59504ce6909SAl Viro static void icmpv6_notify(struct sk_buff *skb, int type, int code, __be32 info) 5961da177e4SLinus Torvalds { 5971da177e4SLinus Torvalds struct inet6_protocol *ipprot; 5981da177e4SLinus Torvalds int inner_offset; 5991da177e4SLinus Torvalds int hash; 6001da177e4SLinus Torvalds u8 nexthdr; 6011da177e4SLinus Torvalds 6021da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 6031da177e4SLinus Torvalds return; 6041da177e4SLinus Torvalds 6051da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 6061da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 6071da177e4SLinus Torvalds /* now skip over extension headers */ 6080d3d077cSHerbert Xu inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr); 6091da177e4SLinus Torvalds if (inner_offset<0) 6101da177e4SLinus Torvalds return; 6111da177e4SLinus Torvalds } else { 6121da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 6131da177e4SLinus Torvalds } 6141da177e4SLinus Torvalds 6151da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 6161da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 6171da177e4SLinus Torvalds return; 6181da177e4SLinus Torvalds 6191da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 6201da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 6211da177e4SLinus Torvalds pmtu discovery. 6221da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 6231da177e4SLinus Torvalds --ANK (980726) 6241da177e4SLinus Torvalds */ 6251da177e4SLinus Torvalds 6261da177e4SLinus Torvalds hash = nexthdr & (MAX_INET_PROTOS - 1); 6271da177e4SLinus Torvalds 6281da177e4SLinus Torvalds rcu_read_lock(); 6291da177e4SLinus Torvalds ipprot = rcu_dereference(inet6_protos[hash]); 6301da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 6311da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 6321da177e4SLinus Torvalds rcu_read_unlock(); 6331da177e4SLinus Torvalds 63469d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 6351da177e4SLinus Torvalds } 6361da177e4SLinus Torvalds 6371da177e4SLinus Torvalds /* 6381da177e4SLinus Torvalds * Handle icmp messages 6391da177e4SLinus Torvalds */ 6401da177e4SLinus Torvalds 641e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 6421da177e4SLinus Torvalds { 6431da177e4SLinus Torvalds struct net_device *dev = skb->dev; 6441da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 6451da177e4SLinus Torvalds struct in6_addr *saddr, *daddr; 6461da177e4SLinus Torvalds struct ipv6hdr *orig_hdr; 6471da177e4SLinus Torvalds struct icmp6hdr *hdr; 6481da177e4SLinus Torvalds int type; 6491da177e4SLinus Torvalds 650aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 6518b7817f3SHerbert Xu int nh; 6528b7817f3SHerbert Xu 653aebcf82cSHerbert Xu if (!(skb->sp && skb->sp->xvec[skb->sp->len - 1]->props.flags & 654aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 655aebcf82cSHerbert Xu goto drop_no_count; 656aebcf82cSHerbert Xu 6578b7817f3SHerbert Xu if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(*orig_hdr))) 6588b7817f3SHerbert Xu goto drop_no_count; 6598b7817f3SHerbert Xu 6608b7817f3SHerbert Xu nh = skb_network_offset(skb); 6618b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 6628b7817f3SHerbert Xu 6638b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 6648b7817f3SHerbert Xu goto drop_no_count; 6658b7817f3SHerbert Xu 6668b7817f3SHerbert Xu skb_set_network_header(skb, nh); 6678b7817f3SHerbert Xu } 6688b7817f3SHerbert Xu 6691da177e4SLinus Torvalds ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INMSGS); 6701da177e4SLinus Torvalds 6710660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 6720660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 6731da177e4SLinus Torvalds 6741da177e4SLinus Torvalds /* Perform checksum. */ 675fb286bb2SHerbert Xu switch (skb->ip_summed) { 67684fa7933SPatrick McHardy case CHECKSUM_COMPLETE: 677fb286bb2SHerbert Xu if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, 678fb286bb2SHerbert Xu skb->csum)) 679fb286bb2SHerbert Xu break; 680fb286bb2SHerbert Xu /* fall through */ 681fb286bb2SHerbert Xu case CHECKSUM_NONE: 682868c86bcSAl Viro skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len, 683868c86bcSAl Viro IPPROTO_ICMPV6, 0)); 684fb286bb2SHerbert Xu if (__skb_checksum_complete(skb)) { 68546b86a2dSJoe Perches LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [" NIP6_FMT " > " NIP6_FMT "]\n", 68664ce2073SPatrick McHardy NIP6(*saddr), NIP6(*daddr)); 6871da177e4SLinus Torvalds goto discard_it; 6881da177e4SLinus Torvalds } 6891da177e4SLinus Torvalds } 6901da177e4SLinus Torvalds 6918cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 6928cf22943SHerbert Xu goto discard_it; 6931da177e4SLinus Torvalds 694cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 6951da177e4SLinus Torvalds 6961da177e4SLinus Torvalds type = hdr->icmp6_type; 6971da177e4SLinus Torvalds 69814878f75SDavid L Stevens ICMP6MSGIN_INC_STATS_BH(idev, type); 6991da177e4SLinus Torvalds 7001da177e4SLinus Torvalds switch (type) { 7011da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 7021da177e4SLinus Torvalds icmpv6_echo_reply(skb); 7031da177e4SLinus Torvalds break; 7041da177e4SLinus Torvalds 7051da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 7061da177e4SLinus Torvalds /* we couldn't care less */ 7071da177e4SLinus Torvalds break; 7081da177e4SLinus Torvalds 7091da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 7101da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 7111da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 7121da177e4SLinus Torvalds destination cache will allow to solve this problem 7131da177e4SLinus Torvalds --ANK (980726) 7141da177e4SLinus Torvalds */ 7151da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 7161da177e4SLinus Torvalds goto discard_it; 717cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 7181da177e4SLinus Torvalds orig_hdr = (struct ipv6hdr *) (hdr + 1); 7191da177e4SLinus Torvalds rt6_pmtu_discovery(&orig_hdr->daddr, &orig_hdr->saddr, dev, 7201da177e4SLinus Torvalds ntohl(hdr->icmp6_mtu)); 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds /* 7231da177e4SLinus Torvalds * Drop through to notify 7241da177e4SLinus Torvalds */ 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 7271da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 7281da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 7291da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7301da177e4SLinus Torvalds break; 7311da177e4SLinus Torvalds 7321da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 7331da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 7341da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 7351da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 7361da177e4SLinus Torvalds case NDISC_REDIRECT: 7371da177e4SLinus Torvalds ndisc_rcv(skb); 7381da177e4SLinus Torvalds break; 7391da177e4SLinus Torvalds 7401da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 7411da177e4SLinus Torvalds igmp6_event_query(skb); 7421da177e4SLinus Torvalds break; 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 7451da177e4SLinus Torvalds igmp6_event_report(skb); 7461da177e4SLinus Torvalds break; 7471da177e4SLinus Torvalds 7481da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 7491da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 7501da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 7511da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 7521da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 7531da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 7541da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 7551da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 7561da177e4SLinus Torvalds break; 7571da177e4SLinus Torvalds 7581da177e4SLinus Torvalds default: 75964ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n"); 7601da177e4SLinus Torvalds 7611da177e4SLinus Torvalds /* informational */ 7621da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 7631da177e4SLinus Torvalds break; 7641da177e4SLinus Torvalds 7651da177e4SLinus Torvalds /* 7661da177e4SLinus Torvalds * error of unknown type. 7671da177e4SLinus Torvalds * must pass to upper level 7681da177e4SLinus Torvalds */ 7691da177e4SLinus Torvalds 7701da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7713ff50b79SStephen Hemminger } 7723ff50b79SStephen Hemminger 7731da177e4SLinus Torvalds kfree_skb(skb); 7741da177e4SLinus Torvalds return 0; 7751da177e4SLinus Torvalds 7761da177e4SLinus Torvalds discard_it: 7771da177e4SLinus Torvalds ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS); 7788b7817f3SHerbert Xu drop_no_count: 7791da177e4SLinus Torvalds kfree_skb(skb); 7801da177e4SLinus Torvalds return 0; 7811da177e4SLinus Torvalds } 7821da177e4SLinus Torvalds 78395e41e93SYOSHIFUJI Hideaki void icmpv6_flow_init(struct sock *sk, struct flowi *fl, 78495e41e93SYOSHIFUJI Hideaki u8 type, 78595e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 78695e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 78795e41e93SYOSHIFUJI Hideaki int oif) 78895e41e93SYOSHIFUJI Hideaki { 78995e41e93SYOSHIFUJI Hideaki memset(fl, 0, sizeof(*fl)); 79095e41e93SYOSHIFUJI Hideaki ipv6_addr_copy(&fl->fl6_src, saddr); 79195e41e93SYOSHIFUJI Hideaki ipv6_addr_copy(&fl->fl6_dst, daddr); 79295e41e93SYOSHIFUJI Hideaki fl->proto = IPPROTO_ICMPV6; 79395e41e93SYOSHIFUJI Hideaki fl->fl_icmp_type = type; 79495e41e93SYOSHIFUJI Hideaki fl->fl_icmp_code = 0; 79595e41e93SYOSHIFUJI Hideaki fl->oif = oif; 79695e41e93SYOSHIFUJI Hideaki security_sk_classify_flow(sk, fl); 79795e41e93SYOSHIFUJI Hideaki } 79895e41e93SYOSHIFUJI Hideaki 799640c41c7SIngo Molnar /* 800b7e729c4SDenis V. Lunev * Special lock-class for __icmpv6_sk: 801640c41c7SIngo Molnar */ 802640c41c7SIngo Molnar static struct lock_class_key icmpv6_socket_sk_dst_lock_key; 803640c41c7SIngo Molnar 80498c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 8051da177e4SLinus Torvalds { 8061da177e4SLinus Torvalds struct sock *sk; 8071da177e4SLinus Torvalds int err, i, j; 8081da177e4SLinus Torvalds 80998c6d1b2SDenis V. Lunev net->ipv6.icmp_sk = 81098c6d1b2SDenis V. Lunev kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); 81198c6d1b2SDenis V. Lunev if (net->ipv6.icmp_sk == NULL) 81279c91159SDenis V. Lunev return -ENOMEM; 81379c91159SDenis V. Lunev 8146f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 815b7e729c4SDenis V. Lunev struct socket *sock; 8161da177e4SLinus Torvalds err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, 817b7e729c4SDenis V. Lunev &sock); 8181da177e4SLinus Torvalds if (err < 0) { 8191da177e4SLinus Torvalds printk(KERN_ERR 8201da177e4SLinus Torvalds "Failed to initialize the ICMP6 control socket " 8211da177e4SLinus Torvalds "(err %d).\n", 8221da177e4SLinus Torvalds err); 8231da177e4SLinus Torvalds goto fail; 8241da177e4SLinus Torvalds } 8251da177e4SLinus Torvalds 82698c6d1b2SDenis V. Lunev net->ipv6.icmp_sk[i] = sk = sock->sk; 82798c6d1b2SDenis V. Lunev sk_change_net(sk, net); 8285c8cafd6SDenis V. Lunev 8291da177e4SLinus Torvalds sk->sk_allocation = GFP_ATOMIC; 830640c41c7SIngo Molnar /* 831640c41c7SIngo Molnar * Split off their lock-class, because sk->sk_dst_lock 832640c41c7SIngo Molnar * gets used from softirqs, which is safe for 833b7e729c4SDenis V. Lunev * __icmpv6_sk (because those never get directly used 834640c41c7SIngo Molnar * via userspace syscalls), but unsafe for normal sockets. 835640c41c7SIngo Molnar */ 836640c41c7SIngo Molnar lockdep_set_class(&sk->sk_dst_lock, 837640c41c7SIngo Molnar &icmpv6_socket_sk_dst_lock_key); 8381da177e4SLinus Torvalds 8391da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 8401da177e4SLinus Torvalds * sk_buff struct overhead. 8411da177e4SLinus Torvalds */ 8421da177e4SLinus Torvalds sk->sk_sndbuf = 8431da177e4SLinus Torvalds (2 * ((64 * 1024) + sizeof(struct sk_buff))); 8441da177e4SLinus Torvalds 8451da177e4SLinus Torvalds sk->sk_prot->unhash(sk); 8461da177e4SLinus Torvalds } 8471da177e4SLinus Torvalds return 0; 8481da177e4SLinus Torvalds 8491da177e4SLinus Torvalds fail: 8505c8cafd6SDenis V. Lunev for (j = 0; j < i; j++) 85198c6d1b2SDenis V. Lunev sk_release_kernel(net->ipv6.icmp_sk[j]); 85298c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 8531da177e4SLinus Torvalds return err; 8541da177e4SLinus Torvalds } 8551da177e4SLinus Torvalds 85698c6d1b2SDenis V. Lunev static void __net_exit icmpv6_sk_exit(struct net *net) 8571da177e4SLinus Torvalds { 8581da177e4SLinus Torvalds int i; 8591da177e4SLinus Torvalds 8606f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 86198c6d1b2SDenis V. Lunev sk_release_kernel(net->ipv6.icmp_sk[i]); 8621da177e4SLinus Torvalds } 86398c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 86498c6d1b2SDenis V. Lunev } 86598c6d1b2SDenis V. Lunev 8668ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 86798c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 86898c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 86998c6d1b2SDenis V. Lunev }; 87098c6d1b2SDenis V. Lunev 87198c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 87298c6d1b2SDenis V. Lunev { 87398c6d1b2SDenis V. Lunev int err; 87498c6d1b2SDenis V. Lunev 87598c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 87698c6d1b2SDenis V. Lunev if (err < 0) 87798c6d1b2SDenis V. Lunev return err; 87898c6d1b2SDenis V. Lunev 87998c6d1b2SDenis V. Lunev err = -EAGAIN; 88098c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 88198c6d1b2SDenis V. Lunev goto fail; 88298c6d1b2SDenis V. Lunev return 0; 88398c6d1b2SDenis V. Lunev 88498c6d1b2SDenis V. Lunev fail: 88598c6d1b2SDenis V. Lunev printk(KERN_ERR "Failed to register ICMP6 protocol\n"); 88698c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 88798c6d1b2SDenis V. Lunev return err; 88898c6d1b2SDenis V. Lunev } 88998c6d1b2SDenis V. Lunev 8908ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 89198c6d1b2SDenis V. Lunev { 89298c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 8931da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 8941da177e4SLinus Torvalds } 8951da177e4SLinus Torvalds 89698c6d1b2SDenis V. Lunev 8979b5b5cffSArjan van de Ven static const struct icmp6_err { 8981da177e4SLinus Torvalds int err; 8991da177e4SLinus Torvalds int fatal; 9001da177e4SLinus Torvalds } tab_unreach[] = { 9011da177e4SLinus Torvalds { /* NOROUTE */ 9021da177e4SLinus Torvalds .err = ENETUNREACH, 9031da177e4SLinus Torvalds .fatal = 0, 9041da177e4SLinus Torvalds }, 9051da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 9061da177e4SLinus Torvalds .err = EACCES, 9071da177e4SLinus Torvalds .fatal = 1, 9081da177e4SLinus Torvalds }, 9091da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 9101da177e4SLinus Torvalds .err = EHOSTUNREACH, 9111da177e4SLinus Torvalds .fatal = 0, 9121da177e4SLinus Torvalds }, 9131da177e4SLinus Torvalds { /* ADDR_UNREACH */ 9141da177e4SLinus Torvalds .err = EHOSTUNREACH, 9151da177e4SLinus Torvalds .fatal = 0, 9161da177e4SLinus Torvalds }, 9171da177e4SLinus Torvalds { /* PORT_UNREACH */ 9181da177e4SLinus Torvalds .err = ECONNREFUSED, 9191da177e4SLinus Torvalds .fatal = 1, 9201da177e4SLinus Torvalds }, 9211da177e4SLinus Torvalds }; 9221da177e4SLinus Torvalds 9231da177e4SLinus Torvalds int icmpv6_err_convert(int type, int code, int *err) 9241da177e4SLinus Torvalds { 9251da177e4SLinus Torvalds int fatal = 0; 9261da177e4SLinus Torvalds 9271da177e4SLinus Torvalds *err = EPROTO; 9281da177e4SLinus Torvalds 9291da177e4SLinus Torvalds switch (type) { 9301da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 9311da177e4SLinus Torvalds fatal = 1; 9321da177e4SLinus Torvalds if (code <= ICMPV6_PORT_UNREACH) { 9331da177e4SLinus Torvalds *err = tab_unreach[code].err; 9341da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 9351da177e4SLinus Torvalds } 9361da177e4SLinus Torvalds break; 9371da177e4SLinus Torvalds 9381da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 9391da177e4SLinus Torvalds *err = EMSGSIZE; 9401da177e4SLinus Torvalds break; 9411da177e4SLinus Torvalds 9421da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 9431da177e4SLinus Torvalds *err = EPROTO; 9441da177e4SLinus Torvalds fatal = 1; 9451da177e4SLinus Torvalds break; 9461da177e4SLinus Torvalds 9471da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 9481da177e4SLinus Torvalds *err = EHOSTUNREACH; 9491da177e4SLinus Torvalds break; 9503ff50b79SStephen Hemminger } 9511da177e4SLinus Torvalds 9521da177e4SLinus Torvalds return fatal; 9531da177e4SLinus Torvalds } 9541da177e4SLinus Torvalds 9557159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 9567159039aSYOSHIFUJI Hideaki 9571da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 958760f2d01SDaniel Lezcano ctl_table ipv6_icmp_table_template[] = { 9591da177e4SLinus Torvalds { 9601da177e4SLinus Torvalds .ctl_name = NET_IPV6_ICMP_RATELIMIT, 9611da177e4SLinus Torvalds .procname = "ratelimit", 96241a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 9631da177e4SLinus Torvalds .maxlen = sizeof(int), 9641da177e4SLinus Torvalds .mode = 0644, 9651da177e4SLinus Torvalds .proc_handler = &proc_dointvec 9661da177e4SLinus Torvalds }, 9671da177e4SLinus Torvalds { .ctl_name = 0 }, 9681da177e4SLinus Torvalds }; 969760f2d01SDaniel Lezcano 970760f2d01SDaniel Lezcano struct ctl_table *ipv6_icmp_sysctl_init(struct net *net) 971760f2d01SDaniel Lezcano { 972760f2d01SDaniel Lezcano struct ctl_table *table; 973760f2d01SDaniel Lezcano 974760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 975760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 976760f2d01SDaniel Lezcano GFP_KERNEL); 9775ee09105SYOSHIFUJI Hideaki 9785ee09105SYOSHIFUJI Hideaki if (table) 9795ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 9805ee09105SYOSHIFUJI Hideaki 981760f2d01SDaniel Lezcano return table; 982760f2d01SDaniel Lezcano } 9831da177e4SLinus Torvalds #endif 9841da177e4SLinus Torvalds 985