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; 1661da177e4SLinus Torvalds int res = 0; 1671da177e4SLinus Torvalds 1681da177e4SLinus Torvalds /* Informational messages are not limited. */ 1691da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 1701da177e4SLinus Torvalds return 1; 1711da177e4SLinus Torvalds 1721da177e4SLinus Torvalds /* Do not limit pmtu discovery, it would break it. */ 1731da177e4SLinus Torvalds if (type == ICMPV6_PKT_TOOBIG) 1741da177e4SLinus Torvalds return 1; 1751da177e4SLinus Torvalds 1761da177e4SLinus Torvalds /* 1771da177e4SLinus Torvalds * Look up the output route. 1781da177e4SLinus Torvalds * XXX: perhaps the expire for routing entries cloned by 1791da177e4SLinus Torvalds * this lookup should be more aggressive (not longer than timeout). 1801da177e4SLinus Torvalds */ 1811da177e4SLinus Torvalds dst = ip6_route_output(sk, fl); 1821da177e4SLinus Torvalds if (dst->error) { 183a11d206dSYOSHIFUJI Hideaki IP6_INC_STATS(ip6_dst_idev(dst), 184a11d206dSYOSHIFUJI Hideaki IPSTATS_MIB_OUTNOROUTES); 1851da177e4SLinus Torvalds } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { 1861da177e4SLinus Torvalds res = 1; 1871da177e4SLinus Torvalds } else { 1881da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 18941a76906SDaniel Lezcano int tmo = init_net.ipv6.sysctl.icmpv6_time; 1901da177e4SLinus Torvalds 1911da177e4SLinus Torvalds /* Give more bandwidth to wider prefixes. */ 1921da177e4SLinus Torvalds if (rt->rt6i_dst.plen < 128) 1931da177e4SLinus Torvalds tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 1941da177e4SLinus Torvalds 1951da177e4SLinus Torvalds res = xrlim_allow(dst, tmo); 1961da177e4SLinus Torvalds } 1971da177e4SLinus Torvalds dst_release(dst); 1981da177e4SLinus Torvalds return res; 1991da177e4SLinus Torvalds } 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvalds /* 2021da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2031da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2041da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2051da177e4SLinus Torvalds * highest-order two bits set to 10 2061da177e4SLinus Torvalds */ 2071da177e4SLinus Torvalds 2081da177e4SLinus Torvalds static __inline__ int opt_unrec(struct sk_buff *skb, __u32 offset) 2091da177e4SLinus Torvalds { 2101da177e4SLinus Torvalds u8 _optval, *op; 2111da177e4SLinus Torvalds 212bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2131da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 2141da177e4SLinus Torvalds if (op == NULL) 2151da177e4SLinus Torvalds return 1; 2161da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2171da177e4SLinus Torvalds } 2181da177e4SLinus Torvalds 2191da177e4SLinus Torvalds static int icmpv6_push_pending_frames(struct sock *sk, struct flowi *fl, struct icmp6hdr *thdr, int len) 2201da177e4SLinus Torvalds { 2211da177e4SLinus Torvalds struct sk_buff *skb; 2221da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2231da177e4SLinus Torvalds int err = 0; 2241da177e4SLinus Torvalds 2251da177e4SLinus Torvalds if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 2261da177e4SLinus Torvalds goto out; 2271da177e4SLinus Torvalds 228cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2291da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2301da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2311da177e4SLinus Torvalds 2321da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 2331da177e4SLinus Torvalds skb->csum = csum_partial((char *)icmp6h, 2341da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2351da177e4SLinus Torvalds icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src, 2361da177e4SLinus Torvalds &fl->fl6_dst, 2371da177e4SLinus Torvalds len, fl->proto, 2381da177e4SLinus Torvalds skb->csum); 2391da177e4SLinus Torvalds } else { 240868c86bcSAl Viro __wsum tmp_csum = 0; 2411da177e4SLinus Torvalds 2421da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2431da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2441da177e4SLinus Torvalds } 2451da177e4SLinus Torvalds 2461da177e4SLinus Torvalds tmp_csum = csum_partial((char *)icmp6h, 2471da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 248868c86bcSAl Viro icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src, 2491da177e4SLinus Torvalds &fl->fl6_dst, 250868c86bcSAl Viro len, fl->proto, 251868c86bcSAl Viro tmp_csum); 2521da177e4SLinus Torvalds } 2531da177e4SLinus Torvalds ip6_push_pending_frames(sk); 2541da177e4SLinus Torvalds out: 2551da177e4SLinus Torvalds return err; 2561da177e4SLinus Torvalds } 2571da177e4SLinus Torvalds 2581da177e4SLinus Torvalds struct icmpv6_msg { 2591da177e4SLinus Torvalds struct sk_buff *skb; 2601da177e4SLinus Torvalds int offset; 261763ecff1SYasuyuki Kozakai uint8_t type; 2621da177e4SLinus Torvalds }; 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 2651da177e4SLinus Torvalds { 2661da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 2671da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 2685f92a738SAl Viro __wsum csum = 0; 2691da177e4SLinus Torvalds 2701da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 2711da177e4SLinus Torvalds to, len, csum); 2721da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 273763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 274763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 2751da177e4SLinus Torvalds return 0; 2761da177e4SLinus Torvalds } 2771da177e4SLinus Torvalds 27859fbb3a6SMasahide NAKAMURA #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 27979383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 28079383236SMasahide NAKAMURA { 2810660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 28279383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 28379383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 28479383236SMasahide NAKAMURA struct in6_addr tmp; 28579383236SMasahide NAKAMURA int off; 28679383236SMasahide NAKAMURA 28779383236SMasahide NAKAMURA if (opt->dsthao) { 28879383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 28979383236SMasahide NAKAMURA if (likely(off >= 0)) { 290d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 291d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 29279383236SMasahide NAKAMURA ipv6_addr_copy(&tmp, &iph->saddr); 29379383236SMasahide NAKAMURA ipv6_addr_copy(&iph->saddr, &hao->addr); 29479383236SMasahide NAKAMURA ipv6_addr_copy(&hao->addr, &tmp); 29579383236SMasahide NAKAMURA } 29679383236SMasahide NAKAMURA } 29779383236SMasahide NAKAMURA } 29879383236SMasahide NAKAMURA #else 29979383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 30079383236SMasahide NAKAMURA #endif 30179383236SMasahide NAKAMURA 3021da177e4SLinus Torvalds /* 3031da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 3041da177e4SLinus Torvalds */ 3051da177e4SLinus Torvalds void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info, 3061da177e4SLinus Torvalds struct net_device *dev) 3071da177e4SLinus Torvalds { 3081da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 3090660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 31084427d53SYOSHIFUJI Hideaki struct sock *sk; 31184427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 3121da177e4SLinus Torvalds struct in6_addr *saddr = NULL; 3131da177e4SLinus Torvalds struct dst_entry *dst; 3148b7817f3SHerbert Xu struct dst_entry *dst2; 3151da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 3161da177e4SLinus Torvalds struct flowi fl; 3178b7817f3SHerbert Xu struct flowi fl2; 3181da177e4SLinus Torvalds struct icmpv6_msg msg; 3191da177e4SLinus Torvalds int iif = 0; 3201da177e4SLinus Torvalds int addr_type = 0; 3211da177e4SLinus Torvalds int len; 32241a1f8eaSYOSHIFUJI Hideaki int hlimit, tclass; 3231da177e4SLinus Torvalds int err = 0; 3241da177e4SLinus Torvalds 32527a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 32627a884dcSArnaldo Carvalho de Melo (skb->network_header + sizeof(*hdr)) > skb->tail) 3271da177e4SLinus Torvalds return; 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvalds /* 3301da177e4SLinus Torvalds * Make sure we respect the rules 3311da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 3321da177e4SLinus Torvalds * Rule (e.1) is enforced by not using icmpv6_send 3331da177e4SLinus Torvalds * in any code that processes icmp errors. 3341da177e4SLinus Torvalds */ 3351da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 3361da177e4SLinus Torvalds 337bfeade08SDaniel Lezcano if (ipv6_chk_addr(&init_net, &hdr->daddr, skb->dev, 0)) 3381da177e4SLinus Torvalds saddr = &hdr->daddr; 3391da177e4SLinus Torvalds 3401da177e4SLinus Torvalds /* 3411da177e4SLinus Torvalds * Dest addr check 3421da177e4SLinus Torvalds */ 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) { 3451da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 3461da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 3471da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 3481da177e4SLinus Torvalds (opt_unrec(skb, info)))) 3491da177e4SLinus Torvalds return; 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds saddr = NULL; 3521da177e4SLinus Torvalds } 3531da177e4SLinus Torvalds 3541da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 3551da177e4SLinus Torvalds 3561da177e4SLinus Torvalds /* 3571da177e4SLinus Torvalds * Source addr check 3581da177e4SLinus Torvalds */ 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds if (addr_type & IPV6_ADDR_LINKLOCAL) 3611da177e4SLinus Torvalds iif = skb->dev->ifindex; 3621da177e4SLinus Torvalds 3631da177e4SLinus Torvalds /* 3648de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 3658de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 3668de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 3678de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 3681da177e4SLinus Torvalds */ 3691da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 37064ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n"); 3711da177e4SLinus Torvalds return; 3721da177e4SLinus Torvalds } 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvalds /* 3751da177e4SLinus Torvalds * Never answer to a ICMP packet. 3761da177e4SLinus Torvalds */ 3771da177e4SLinus Torvalds if (is_ineligible(skb)) { 37864ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n"); 3791da177e4SLinus Torvalds return; 3801da177e4SLinus Torvalds } 3811da177e4SLinus Torvalds 38279383236SMasahide NAKAMURA mip6_addr_swap(skb); 38379383236SMasahide NAKAMURA 3841da177e4SLinus Torvalds memset(&fl, 0, sizeof(fl)); 3851da177e4SLinus Torvalds fl.proto = IPPROTO_ICMPV6; 3861da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_dst, &hdr->saddr); 3871da177e4SLinus Torvalds if (saddr) 3881da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_src, saddr); 3891da177e4SLinus Torvalds fl.oif = iif; 3901da177e4SLinus Torvalds fl.fl_icmp_type = type; 3911da177e4SLinus Torvalds fl.fl_icmp_code = code; 392beb8d13bSVenkat Yekkirala security_skb_classify_flow(skb, &fl); 3931da177e4SLinus Torvalds 39498c6d1b2SDenis V. Lunev sk = icmpv6_sk(&init_net); 39584427d53SYOSHIFUJI Hideaki np = inet6_sk(sk); 39684427d53SYOSHIFUJI Hideaki 397405666dbSDenis V. Lunev if (icmpv6_xmit_lock(sk)) 398405666dbSDenis V. Lunev return; 399405666dbSDenis V. Lunev 4001da177e4SLinus Torvalds if (!icmpv6_xrlim_allow(sk, type, &fl)) 4011da177e4SLinus Torvalds goto out; 4021da177e4SLinus Torvalds 4031da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 4041da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 4051da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 4061da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 4071da177e4SLinus Torvalds 4081da177e4SLinus Torvalds if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 4091da177e4SLinus Torvalds fl.oif = np->mcast_oif; 4101da177e4SLinus Torvalds 4111da177e4SLinus Torvalds err = ip6_dst_lookup(sk, &dst, &fl); 4121da177e4SLinus Torvalds if (err) 4131da177e4SLinus Torvalds goto out; 4148de3351eSYOSHIFUJI Hideaki 4158de3351eSYOSHIFUJI Hideaki /* 4168de3351eSYOSHIFUJI Hideaki * We won't send icmp if the destination is known 4178de3351eSYOSHIFUJI Hideaki * anycast. 4188de3351eSYOSHIFUJI Hideaki */ 4198de3351eSYOSHIFUJI Hideaki if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { 4208de3351eSYOSHIFUJI Hideaki LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n"); 4218de3351eSYOSHIFUJI Hideaki goto out_dst_release; 4228de3351eSYOSHIFUJI Hideaki } 4238de3351eSYOSHIFUJI Hideaki 4248b7817f3SHerbert Xu /* No need to clone since we're just using its address. */ 4258b7817f3SHerbert Xu dst2 = dst; 4268b7817f3SHerbert Xu 4278b7817f3SHerbert Xu err = xfrm_lookup(&dst, &fl, sk, 0); 4288b7817f3SHerbert Xu switch (err) { 4298b7817f3SHerbert Xu case 0: 4308b7817f3SHerbert Xu if (dst != dst2) 4318b7817f3SHerbert Xu goto route_done; 4328b7817f3SHerbert Xu break; 4338b7817f3SHerbert Xu case -EPERM: 4348b7817f3SHerbert Xu dst = NULL; 4358b7817f3SHerbert Xu break; 4368b7817f3SHerbert Xu default: 4378b7817f3SHerbert Xu goto out; 4388b7817f3SHerbert Xu } 4398b7817f3SHerbert Xu 4408b7817f3SHerbert Xu if (xfrm_decode_session_reverse(skb, &fl2, AF_INET6)) 441e104411bSPatrick McHardy goto out; 4421da177e4SLinus Torvalds 4438b7817f3SHerbert Xu if (ip6_dst_lookup(sk, &dst2, &fl)) 4448b7817f3SHerbert Xu goto out; 4458b7817f3SHerbert Xu 4468b7817f3SHerbert Xu err = xfrm_lookup(&dst2, &fl, sk, XFRM_LOOKUP_ICMP); 4478b7817f3SHerbert Xu if (err == -ENOENT) { 4488b7817f3SHerbert Xu if (!dst) 4498b7817f3SHerbert Xu goto out; 4508b7817f3SHerbert Xu goto route_done; 4518b7817f3SHerbert Xu } 4528b7817f3SHerbert Xu 4538b7817f3SHerbert Xu dst_release(dst); 4548b7817f3SHerbert Xu dst = dst2; 4558b7817f3SHerbert Xu 4568b7817f3SHerbert Xu if (err) 4578b7817f3SHerbert Xu goto out; 4588b7817f3SHerbert Xu 4598b7817f3SHerbert Xu route_done: 4601da177e4SLinus Torvalds if (ipv6_addr_is_multicast(&fl.fl6_dst)) 4611da177e4SLinus Torvalds hlimit = np->mcast_hops; 4621da177e4SLinus Torvalds else 4631da177e4SLinus Torvalds hlimit = np->hop_limit; 4641da177e4SLinus Torvalds if (hlimit < 0) 4651da177e4SLinus Torvalds hlimit = dst_metric(dst, RTAX_HOPLIMIT); 4661da177e4SLinus Torvalds if (hlimit < 0) 4671da177e4SLinus Torvalds hlimit = ipv6_get_hoplimit(dst->dev); 4681da177e4SLinus Torvalds 469e012d51cSYOSHIFUJI Hideaki tclass = np->tclass; 47041a1f8eaSYOSHIFUJI Hideaki if (tclass < 0) 47141a1f8eaSYOSHIFUJI Hideaki tclass = 0; 47241a1f8eaSYOSHIFUJI Hideaki 4731da177e4SLinus Torvalds msg.skb = skb; 474bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 475763ecff1SYasuyuki Kozakai msg.type = type; 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds len = skb->len - msg.offset; 4781da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); 4791da177e4SLinus Torvalds if (len < 0) { 48064ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n"); 4811da177e4SLinus Torvalds goto out_dst_release; 4821da177e4SLinus Torvalds } 4831da177e4SLinus Torvalds 4841da177e4SLinus Torvalds idev = in6_dev_get(skb->dev); 4851da177e4SLinus Torvalds 4861da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, 4871da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 4881da177e4SLinus Torvalds sizeof(struct icmp6hdr), 48941a1f8eaSYOSHIFUJI Hideaki hlimit, tclass, NULL, &fl, (struct rt6_info*)dst, 4901da177e4SLinus Torvalds MSG_DONTWAIT); 4911da177e4SLinus Torvalds if (err) { 4921da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 4931da177e4SLinus Torvalds goto out_put; 4941da177e4SLinus Torvalds } 4951da177e4SLinus Torvalds err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, len + sizeof(struct icmp6hdr)); 4961da177e4SLinus Torvalds 4971da177e4SLinus Torvalds out_put: 4981da177e4SLinus Torvalds if (likely(idev != NULL)) 4991da177e4SLinus Torvalds in6_dev_put(idev); 5001da177e4SLinus Torvalds out_dst_release: 5011da177e4SLinus Torvalds dst_release(dst); 5021da177e4SLinus Torvalds out: 503405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5041da177e4SLinus Torvalds } 5051da177e4SLinus Torvalds 5067159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_send); 5077159039aSYOSHIFUJI Hideaki 5081da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 5091da177e4SLinus Torvalds { 51084427d53SYOSHIFUJI Hideaki struct sock *sk; 5111da177e4SLinus Torvalds struct inet6_dev *idev; 51284427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 5131da177e4SLinus Torvalds struct in6_addr *saddr = NULL; 514cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 5151da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 5161da177e4SLinus Torvalds struct flowi fl; 5171da177e4SLinus Torvalds struct icmpv6_msg msg; 5181da177e4SLinus Torvalds struct dst_entry *dst; 5191da177e4SLinus Torvalds int err = 0; 5201da177e4SLinus Torvalds int hlimit; 52141a1f8eaSYOSHIFUJI Hideaki int tclass; 5221da177e4SLinus Torvalds 5230660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 5241da177e4SLinus Torvalds 5251da177e4SLinus Torvalds if (!ipv6_unicast_destination(skb)) 5261da177e4SLinus Torvalds saddr = NULL; 5271da177e4SLinus Torvalds 5281da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 5291da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 5301da177e4SLinus Torvalds 5311da177e4SLinus Torvalds memset(&fl, 0, sizeof(fl)); 5321da177e4SLinus Torvalds fl.proto = IPPROTO_ICMPV6; 5330660e03fSArnaldo Carvalho de Melo ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); 5341da177e4SLinus Torvalds if (saddr) 5351da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_src, saddr); 5361da177e4SLinus Torvalds fl.oif = skb->dev->ifindex; 5371da177e4SLinus Torvalds fl.fl_icmp_type = ICMPV6_ECHO_REPLY; 538beb8d13bSVenkat Yekkirala security_skb_classify_flow(skb, &fl); 5391da177e4SLinus Torvalds 54098c6d1b2SDenis V. Lunev sk = icmpv6_sk(&init_net); 54184427d53SYOSHIFUJI Hideaki np = inet6_sk(sk); 54284427d53SYOSHIFUJI Hideaki 543405666dbSDenis V. Lunev if (icmpv6_xmit_lock(sk)) 544405666dbSDenis V. Lunev return; 545405666dbSDenis V. Lunev 5461da177e4SLinus Torvalds if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 5471da177e4SLinus Torvalds fl.oif = np->mcast_oif; 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds err = ip6_dst_lookup(sk, &dst, &fl); 5501da177e4SLinus Torvalds if (err) 5511da177e4SLinus Torvalds goto out; 5521da177e4SLinus Torvalds if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) 553e104411bSPatrick McHardy goto out; 5541da177e4SLinus Torvalds 5551da177e4SLinus Torvalds if (ipv6_addr_is_multicast(&fl.fl6_dst)) 5561da177e4SLinus Torvalds hlimit = np->mcast_hops; 5571da177e4SLinus Torvalds else 5581da177e4SLinus Torvalds hlimit = np->hop_limit; 5591da177e4SLinus Torvalds if (hlimit < 0) 5601da177e4SLinus Torvalds hlimit = dst_metric(dst, RTAX_HOPLIMIT); 5611da177e4SLinus Torvalds if (hlimit < 0) 5621da177e4SLinus Torvalds hlimit = ipv6_get_hoplimit(dst->dev); 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 780640c41c7SIngo Molnar /* 781b7e729c4SDenis V. Lunev * Special lock-class for __icmpv6_sk: 782640c41c7SIngo Molnar */ 783640c41c7SIngo Molnar static struct lock_class_key icmpv6_socket_sk_dst_lock_key; 784640c41c7SIngo Molnar 78598c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 7861da177e4SLinus Torvalds { 7871da177e4SLinus Torvalds struct sock *sk; 7881da177e4SLinus Torvalds int err, i, j; 7891da177e4SLinus Torvalds 79098c6d1b2SDenis V. Lunev net->ipv6.icmp_sk = 79198c6d1b2SDenis V. Lunev kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); 79298c6d1b2SDenis V. Lunev if (net->ipv6.icmp_sk == NULL) 79379c91159SDenis V. Lunev return -ENOMEM; 79479c91159SDenis V. Lunev 7956f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 796b7e729c4SDenis V. Lunev struct socket *sock; 7971da177e4SLinus Torvalds err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, 798b7e729c4SDenis V. Lunev &sock); 7991da177e4SLinus Torvalds if (err < 0) { 8001da177e4SLinus Torvalds printk(KERN_ERR 8011da177e4SLinus Torvalds "Failed to initialize the ICMP6 control socket " 8021da177e4SLinus Torvalds "(err %d).\n", 8031da177e4SLinus Torvalds err); 8041da177e4SLinus Torvalds goto fail; 8051da177e4SLinus Torvalds } 8061da177e4SLinus Torvalds 80798c6d1b2SDenis V. Lunev net->ipv6.icmp_sk[i] = sk = sock->sk; 80898c6d1b2SDenis V. Lunev sk_change_net(sk, net); 8095c8cafd6SDenis V. Lunev 8101da177e4SLinus Torvalds sk->sk_allocation = GFP_ATOMIC; 811640c41c7SIngo Molnar /* 812640c41c7SIngo Molnar * Split off their lock-class, because sk->sk_dst_lock 813640c41c7SIngo Molnar * gets used from softirqs, which is safe for 814b7e729c4SDenis V. Lunev * __icmpv6_sk (because those never get directly used 815640c41c7SIngo Molnar * via userspace syscalls), but unsafe for normal sockets. 816640c41c7SIngo Molnar */ 817640c41c7SIngo Molnar lockdep_set_class(&sk->sk_dst_lock, 818640c41c7SIngo Molnar &icmpv6_socket_sk_dst_lock_key); 8191da177e4SLinus Torvalds 8201da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 8211da177e4SLinus Torvalds * sk_buff struct overhead. 8221da177e4SLinus Torvalds */ 8231da177e4SLinus Torvalds sk->sk_sndbuf = 8241da177e4SLinus Torvalds (2 * ((64 * 1024) + sizeof(struct sk_buff))); 8251da177e4SLinus Torvalds 8261da177e4SLinus Torvalds sk->sk_prot->unhash(sk); 8271da177e4SLinus Torvalds } 8281da177e4SLinus Torvalds return 0; 8291da177e4SLinus Torvalds 8301da177e4SLinus Torvalds fail: 8315c8cafd6SDenis V. Lunev for (j = 0; j < i; j++) 83298c6d1b2SDenis V. Lunev sk_release_kernel(net->ipv6.icmp_sk[j]); 83398c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 8341da177e4SLinus Torvalds return err; 8351da177e4SLinus Torvalds } 8361da177e4SLinus Torvalds 83798c6d1b2SDenis V. Lunev static void __net_exit icmpv6_sk_exit(struct net *net) 8381da177e4SLinus Torvalds { 8391da177e4SLinus Torvalds int i; 8401da177e4SLinus Torvalds 8416f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 84298c6d1b2SDenis V. Lunev sk_release_kernel(net->ipv6.icmp_sk[i]); 8431da177e4SLinus Torvalds } 84498c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 84598c6d1b2SDenis V. Lunev } 84698c6d1b2SDenis V. Lunev 8478ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 84898c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 84998c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 85098c6d1b2SDenis V. Lunev }; 85198c6d1b2SDenis V. Lunev 85298c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 85398c6d1b2SDenis V. Lunev { 85498c6d1b2SDenis V. Lunev int err; 85598c6d1b2SDenis V. Lunev 85698c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 85798c6d1b2SDenis V. Lunev if (err < 0) 85898c6d1b2SDenis V. Lunev return err; 85998c6d1b2SDenis V. Lunev 86098c6d1b2SDenis V. Lunev err = -EAGAIN; 86198c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 86298c6d1b2SDenis V. Lunev goto fail; 86398c6d1b2SDenis V. Lunev return 0; 86498c6d1b2SDenis V. Lunev 86598c6d1b2SDenis V. Lunev fail: 86698c6d1b2SDenis V. Lunev printk(KERN_ERR "Failed to register ICMP6 protocol\n"); 86798c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 86898c6d1b2SDenis V. Lunev return err; 86998c6d1b2SDenis V. Lunev } 87098c6d1b2SDenis V. Lunev 8718ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 87298c6d1b2SDenis V. Lunev { 87398c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 8741da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 8751da177e4SLinus Torvalds } 8761da177e4SLinus Torvalds 87798c6d1b2SDenis V. Lunev 8789b5b5cffSArjan van de Ven static const struct icmp6_err { 8791da177e4SLinus Torvalds int err; 8801da177e4SLinus Torvalds int fatal; 8811da177e4SLinus Torvalds } tab_unreach[] = { 8821da177e4SLinus Torvalds { /* NOROUTE */ 8831da177e4SLinus Torvalds .err = ENETUNREACH, 8841da177e4SLinus Torvalds .fatal = 0, 8851da177e4SLinus Torvalds }, 8861da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 8871da177e4SLinus Torvalds .err = EACCES, 8881da177e4SLinus Torvalds .fatal = 1, 8891da177e4SLinus Torvalds }, 8901da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 8911da177e4SLinus Torvalds .err = EHOSTUNREACH, 8921da177e4SLinus Torvalds .fatal = 0, 8931da177e4SLinus Torvalds }, 8941da177e4SLinus Torvalds { /* ADDR_UNREACH */ 8951da177e4SLinus Torvalds .err = EHOSTUNREACH, 8961da177e4SLinus Torvalds .fatal = 0, 8971da177e4SLinus Torvalds }, 8981da177e4SLinus Torvalds { /* PORT_UNREACH */ 8991da177e4SLinus Torvalds .err = ECONNREFUSED, 9001da177e4SLinus Torvalds .fatal = 1, 9011da177e4SLinus Torvalds }, 9021da177e4SLinus Torvalds }; 9031da177e4SLinus Torvalds 9041da177e4SLinus Torvalds int icmpv6_err_convert(int type, int code, int *err) 9051da177e4SLinus Torvalds { 9061da177e4SLinus Torvalds int fatal = 0; 9071da177e4SLinus Torvalds 9081da177e4SLinus Torvalds *err = EPROTO; 9091da177e4SLinus Torvalds 9101da177e4SLinus Torvalds switch (type) { 9111da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 9121da177e4SLinus Torvalds fatal = 1; 9131da177e4SLinus Torvalds if (code <= ICMPV6_PORT_UNREACH) { 9141da177e4SLinus Torvalds *err = tab_unreach[code].err; 9151da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 9161da177e4SLinus Torvalds } 9171da177e4SLinus Torvalds break; 9181da177e4SLinus Torvalds 9191da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 9201da177e4SLinus Torvalds *err = EMSGSIZE; 9211da177e4SLinus Torvalds break; 9221da177e4SLinus Torvalds 9231da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 9241da177e4SLinus Torvalds *err = EPROTO; 9251da177e4SLinus Torvalds fatal = 1; 9261da177e4SLinus Torvalds break; 9271da177e4SLinus Torvalds 9281da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 9291da177e4SLinus Torvalds *err = EHOSTUNREACH; 9301da177e4SLinus Torvalds break; 9313ff50b79SStephen Hemminger } 9321da177e4SLinus Torvalds 9331da177e4SLinus Torvalds return fatal; 9341da177e4SLinus Torvalds } 9351da177e4SLinus Torvalds 9367159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 9377159039aSYOSHIFUJI Hideaki 9381da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 939760f2d01SDaniel Lezcano ctl_table ipv6_icmp_table_template[] = { 9401da177e4SLinus Torvalds { 9411da177e4SLinus Torvalds .ctl_name = NET_IPV6_ICMP_RATELIMIT, 9421da177e4SLinus Torvalds .procname = "ratelimit", 94341a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 9441da177e4SLinus Torvalds .maxlen = sizeof(int), 9451da177e4SLinus Torvalds .mode = 0644, 9461da177e4SLinus Torvalds .proc_handler = &proc_dointvec 9471da177e4SLinus Torvalds }, 9481da177e4SLinus Torvalds { .ctl_name = 0 }, 9491da177e4SLinus Torvalds }; 950760f2d01SDaniel Lezcano 951760f2d01SDaniel Lezcano struct ctl_table *ipv6_icmp_sysctl_init(struct net *net) 952760f2d01SDaniel Lezcano { 953760f2d01SDaniel Lezcano struct ctl_table *table; 954760f2d01SDaniel Lezcano 955760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 956760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 957760f2d01SDaniel Lezcano GFP_KERNEL); 958760f2d01SDaniel Lezcano return table; 959760f2d01SDaniel Lezcano } 9601da177e4SLinus Torvalds #endif 9611da177e4SLinus Torvalds 962