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/sched.h> 411da177e4SLinus Torvalds #include <linux/sockios.h> 421da177e4SLinus Torvalds #include <linux/net.h> 431da177e4SLinus Torvalds #include <linux/skbuff.h> 441da177e4SLinus Torvalds #include <linux/init.h> 45763ecff1SYasuyuki Kozakai #include <linux/netfilter.h> 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 481da177e4SLinus Torvalds #include <linux/sysctl.h> 491da177e4SLinus Torvalds #endif 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds #include <linux/inet.h> 521da177e4SLinus Torvalds #include <linux/netdevice.h> 531da177e4SLinus Torvalds #include <linux/icmpv6.h> 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds #include <net/ip.h> 561da177e4SLinus Torvalds #include <net/sock.h> 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds #include <net/ipv6.h> 591da177e4SLinus Torvalds #include <net/ip6_checksum.h> 601da177e4SLinus Torvalds #include <net/protocol.h> 611da177e4SLinus Torvalds #include <net/raw.h> 621da177e4SLinus Torvalds #include <net/rawv6.h> 631da177e4SLinus Torvalds #include <net/transp_v6.h> 641da177e4SLinus Torvalds #include <net/ip6_route.h> 651da177e4SLinus Torvalds #include <net/addrconf.h> 661da177e4SLinus Torvalds #include <net/icmp.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; 721da177e4SLinus Torvalds 731da177e4SLinus Torvalds /* 741da177e4SLinus Torvalds * The ICMP socket(s). This is the most convenient way to flow control 751da177e4SLinus Torvalds * our ICMP output as well as maintain a clean interface throughout 761da177e4SLinus Torvalds * all layers. All Socketless IP sends will soon be gone. 771da177e4SLinus Torvalds * 781da177e4SLinus Torvalds * On SMP we have one ICMP socket per-cpu. 791da177e4SLinus Torvalds */ 801da177e4SLinus Torvalds static DEFINE_PER_CPU(struct socket *, __icmpv6_socket) = NULL; 811da177e4SLinus Torvalds #define icmpv6_socket __get_cpu_var(__icmpv6_socket) 821da177e4SLinus Torvalds 83951dbc8aSPatrick McHardy static int icmpv6_rcv(struct sk_buff **pskb); 841da177e4SLinus Torvalds 851da177e4SLinus Torvalds static struct inet6_protocol icmpv6_protocol = { 861da177e4SLinus Torvalds .handler = icmpv6_rcv, 871da177e4SLinus Torvalds .flags = INET6_PROTO_FINAL, 881da177e4SLinus Torvalds }; 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds static __inline__ int icmpv6_xmit_lock(void) 911da177e4SLinus Torvalds { 921da177e4SLinus Torvalds local_bh_disable(); 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds if (unlikely(!spin_trylock(&icmpv6_socket->sk->sk_lock.slock))) { 951da177e4SLinus Torvalds /* This can happen if the output path (f.e. SIT or 961da177e4SLinus Torvalds * ip6ip6 tunnel) signals dst_link_failure() for an 971da177e4SLinus Torvalds * outgoing ICMP6 packet. 981da177e4SLinus Torvalds */ 991da177e4SLinus Torvalds local_bh_enable(); 1001da177e4SLinus Torvalds return 1; 1011da177e4SLinus Torvalds } 1021da177e4SLinus Torvalds return 0; 1031da177e4SLinus Torvalds } 1041da177e4SLinus Torvalds 1051da177e4SLinus Torvalds static __inline__ void icmpv6_xmit_unlock(void) 1061da177e4SLinus Torvalds { 1071da177e4SLinus Torvalds spin_unlock_bh(&icmpv6_socket->sk->sk_lock.slock); 1081da177e4SLinus Torvalds } 1091da177e4SLinus Torvalds 1101da177e4SLinus Torvalds /* 1111da177e4SLinus Torvalds * Slightly more convenient version of icmpv6_send. 1121da177e4SLinus Torvalds */ 1131da177e4SLinus Torvalds void icmpv6_param_prob(struct sk_buff *skb, int code, int pos) 1141da177e4SLinus Torvalds { 1151da177e4SLinus Torvalds icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos, skb->dev); 1161da177e4SLinus Torvalds kfree_skb(skb); 1171da177e4SLinus Torvalds } 1181da177e4SLinus Torvalds 1191da177e4SLinus Torvalds /* 1201da177e4SLinus Torvalds * Figure out, may we reply to this packet with icmp error. 1211da177e4SLinus Torvalds * 1221da177e4SLinus Torvalds * We do not reply, if: 1231da177e4SLinus Torvalds * - it was icmp error message. 1241da177e4SLinus Torvalds * - it is truncated, so that it is known, that protocol is ICMPV6 1251da177e4SLinus Torvalds * (i.e. in the middle of some exthdr) 1261da177e4SLinus Torvalds * 1271da177e4SLinus Torvalds * --ANK (980726) 1281da177e4SLinus Torvalds */ 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvalds static int is_ineligible(struct sk_buff *skb) 1311da177e4SLinus Torvalds { 1321da177e4SLinus Torvalds int ptr = (u8*)(skb->nh.ipv6h+1) - skb->data; 1331da177e4SLinus Torvalds int len = skb->len - ptr; 1341da177e4SLinus Torvalds __u8 nexthdr = skb->nh.ipv6h->nexthdr; 1351da177e4SLinus Torvalds 1361da177e4SLinus Torvalds if (len < 0) 1371da177e4SLinus Torvalds return 1; 1381da177e4SLinus Torvalds 1390d3d077cSHerbert Xu ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr); 1401da177e4SLinus Torvalds if (ptr < 0) 1411da177e4SLinus Torvalds return 0; 1421da177e4SLinus Torvalds if (nexthdr == IPPROTO_ICMPV6) { 1431da177e4SLinus Torvalds u8 _type, *tp; 1441da177e4SLinus Torvalds tp = skb_header_pointer(skb, 1451da177e4SLinus Torvalds ptr+offsetof(struct icmp6hdr, icmp6_type), 1461da177e4SLinus Torvalds sizeof(_type), &_type); 1471da177e4SLinus Torvalds if (tp == NULL || 1481da177e4SLinus Torvalds !(*tp & ICMPV6_INFOMSG_MASK)) 1491da177e4SLinus Torvalds return 1; 1501da177e4SLinus Torvalds } 1511da177e4SLinus Torvalds return 0; 1521da177e4SLinus Torvalds } 1531da177e4SLinus Torvalds 154ab32ea5dSBrian Haley static int sysctl_icmpv6_time __read_mostly = 1*HZ; 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds /* 1571da177e4SLinus Torvalds * Check the ICMP output rate limit 1581da177e4SLinus Torvalds */ 1591da177e4SLinus Torvalds static inline int icmpv6_xrlim_allow(struct sock *sk, int type, 1601da177e4SLinus Torvalds struct flowi *fl) 1611da177e4SLinus Torvalds { 1621da177e4SLinus Torvalds struct dst_entry *dst; 1631da177e4SLinus Torvalds int res = 0; 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds /* Informational messages are not limited. */ 1661da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 1671da177e4SLinus Torvalds return 1; 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvalds /* Do not limit pmtu discovery, it would break it. */ 1701da177e4SLinus Torvalds if (type == ICMPV6_PKT_TOOBIG) 1711da177e4SLinus Torvalds return 1; 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds /* 1741da177e4SLinus Torvalds * Look up the output route. 1751da177e4SLinus Torvalds * XXX: perhaps the expire for routing entries cloned by 1761da177e4SLinus Torvalds * this lookup should be more aggressive (not longer than timeout). 1771da177e4SLinus Torvalds */ 1781da177e4SLinus Torvalds dst = ip6_route_output(sk, fl); 1791da177e4SLinus Torvalds if (dst->error) { 180a11d206dSYOSHIFUJI Hideaki IP6_INC_STATS(ip6_dst_idev(dst), 181a11d206dSYOSHIFUJI Hideaki IPSTATS_MIB_OUTNOROUTES); 1821da177e4SLinus Torvalds } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { 1831da177e4SLinus Torvalds res = 1; 1841da177e4SLinus Torvalds } else { 1851da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 1861da177e4SLinus Torvalds int tmo = sysctl_icmpv6_time; 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds /* Give more bandwidth to wider prefixes. */ 1891da177e4SLinus Torvalds if (rt->rt6i_dst.plen < 128) 1901da177e4SLinus Torvalds tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds res = xrlim_allow(dst, tmo); 1931da177e4SLinus Torvalds } 1941da177e4SLinus Torvalds dst_release(dst); 1951da177e4SLinus Torvalds return res; 1961da177e4SLinus Torvalds } 1971da177e4SLinus Torvalds 1981da177e4SLinus Torvalds /* 1991da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2001da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2011da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2021da177e4SLinus Torvalds * highest-order two bits set to 10 2031da177e4SLinus Torvalds */ 2041da177e4SLinus Torvalds 2051da177e4SLinus Torvalds static __inline__ int opt_unrec(struct sk_buff *skb, __u32 offset) 2061da177e4SLinus Torvalds { 2071da177e4SLinus Torvalds u8 _optval, *op; 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds offset += skb->nh.raw - skb->data; 2101da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 2111da177e4SLinus Torvalds if (op == NULL) 2121da177e4SLinus Torvalds return 1; 2131da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2141da177e4SLinus Torvalds } 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds static int icmpv6_push_pending_frames(struct sock *sk, struct flowi *fl, struct icmp6hdr *thdr, int len) 2171da177e4SLinus Torvalds { 2181da177e4SLinus Torvalds struct sk_buff *skb; 2191da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2201da177e4SLinus Torvalds int err = 0; 2211da177e4SLinus Torvalds 2221da177e4SLinus Torvalds if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 2231da177e4SLinus Torvalds goto out; 2241da177e4SLinus Torvalds 2251da177e4SLinus Torvalds icmp6h = (struct icmp6hdr*) skb->h.raw; 2261da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2271da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2281da177e4SLinus Torvalds 2291da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 2301da177e4SLinus Torvalds skb->csum = csum_partial((char *)icmp6h, 2311da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2321da177e4SLinus Torvalds icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src, 2331da177e4SLinus Torvalds &fl->fl6_dst, 2341da177e4SLinus Torvalds len, fl->proto, 2351da177e4SLinus Torvalds skb->csum); 2361da177e4SLinus Torvalds } else { 237868c86bcSAl Viro __wsum tmp_csum = 0; 2381da177e4SLinus Torvalds 2391da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2401da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2411da177e4SLinus Torvalds } 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds tmp_csum = csum_partial((char *)icmp6h, 2441da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 245868c86bcSAl Viro icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src, 2461da177e4SLinus Torvalds &fl->fl6_dst, 247868c86bcSAl Viro len, fl->proto, 248868c86bcSAl Viro tmp_csum); 2491da177e4SLinus Torvalds } 2501da177e4SLinus Torvalds ip6_push_pending_frames(sk); 2511da177e4SLinus Torvalds out: 2521da177e4SLinus Torvalds return err; 2531da177e4SLinus Torvalds } 2541da177e4SLinus Torvalds 2551da177e4SLinus Torvalds struct icmpv6_msg { 2561da177e4SLinus Torvalds struct sk_buff *skb; 2571da177e4SLinus Torvalds int offset; 258763ecff1SYasuyuki Kozakai uint8_t type; 2591da177e4SLinus Torvalds }; 2601da177e4SLinus Torvalds 2611da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 2621da177e4SLinus Torvalds { 2631da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 2641da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 2651da177e4SLinus Torvalds __u32 csum = 0; 2661da177e4SLinus Torvalds 2671da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 2681da177e4SLinus Torvalds to, len, csum); 2691da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 270763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 271763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 2721da177e4SLinus Torvalds return 0; 2731da177e4SLinus Torvalds } 2741da177e4SLinus Torvalds 27579383236SMasahide NAKAMURA #ifdef CONFIG_IPV6_MIP6 27679383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 27779383236SMasahide NAKAMURA { 27879383236SMasahide NAKAMURA struct ipv6hdr *iph = skb->nh.ipv6h; 27979383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 28079383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 28179383236SMasahide NAKAMURA struct in6_addr tmp; 28279383236SMasahide NAKAMURA int off; 28379383236SMasahide NAKAMURA 28479383236SMasahide NAKAMURA if (opt->dsthao) { 28579383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 28679383236SMasahide NAKAMURA if (likely(off >= 0)) { 28779383236SMasahide NAKAMURA hao = (struct ipv6_destopt_hao *)(skb->nh.raw + off); 28879383236SMasahide NAKAMURA ipv6_addr_copy(&tmp, &iph->saddr); 28979383236SMasahide NAKAMURA ipv6_addr_copy(&iph->saddr, &hao->addr); 29079383236SMasahide NAKAMURA ipv6_addr_copy(&hao->addr, &tmp); 29179383236SMasahide NAKAMURA } 29279383236SMasahide NAKAMURA } 29379383236SMasahide NAKAMURA } 29479383236SMasahide NAKAMURA #else 29579383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 29679383236SMasahide NAKAMURA #endif 29779383236SMasahide NAKAMURA 2981da177e4SLinus Torvalds /* 2991da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 3001da177e4SLinus Torvalds */ 3011da177e4SLinus Torvalds void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info, 3021da177e4SLinus Torvalds struct net_device *dev) 3031da177e4SLinus Torvalds { 3041da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 3051da177e4SLinus Torvalds struct ipv6hdr *hdr = skb->nh.ipv6h; 30684427d53SYOSHIFUJI Hideaki struct sock *sk; 30784427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 3081da177e4SLinus Torvalds struct in6_addr *saddr = NULL; 3091da177e4SLinus Torvalds struct dst_entry *dst; 3101da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 3111da177e4SLinus Torvalds struct flowi fl; 3121da177e4SLinus Torvalds struct icmpv6_msg msg; 3131da177e4SLinus Torvalds int iif = 0; 3141da177e4SLinus Torvalds int addr_type = 0; 3151da177e4SLinus Torvalds int len; 31641a1f8eaSYOSHIFUJI Hideaki int hlimit, tclass; 3171da177e4SLinus Torvalds int err = 0; 3181da177e4SLinus Torvalds 3191da177e4SLinus Torvalds if ((u8*)hdr < skb->head || (u8*)(hdr+1) > skb->tail) 3201da177e4SLinus Torvalds return; 3211da177e4SLinus Torvalds 3221da177e4SLinus Torvalds /* 3231da177e4SLinus Torvalds * Make sure we respect the rules 3241da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 3251da177e4SLinus Torvalds * Rule (e.1) is enforced by not using icmpv6_send 3261da177e4SLinus Torvalds * in any code that processes icmp errors. 3271da177e4SLinus Torvalds */ 3281da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 3291da177e4SLinus Torvalds 3301da177e4SLinus Torvalds if (ipv6_chk_addr(&hdr->daddr, skb->dev, 0)) 3311da177e4SLinus Torvalds saddr = &hdr->daddr; 3321da177e4SLinus Torvalds 3331da177e4SLinus Torvalds /* 3341da177e4SLinus Torvalds * Dest addr check 3351da177e4SLinus Torvalds */ 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) { 3381da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 3391da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 3401da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 3411da177e4SLinus Torvalds (opt_unrec(skb, info)))) 3421da177e4SLinus Torvalds return; 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds saddr = NULL; 3451da177e4SLinus Torvalds } 3461da177e4SLinus Torvalds 3471da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds /* 3501da177e4SLinus Torvalds * Source addr check 3511da177e4SLinus Torvalds */ 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds if (addr_type & IPV6_ADDR_LINKLOCAL) 3541da177e4SLinus Torvalds iif = skb->dev->ifindex; 3551da177e4SLinus Torvalds 3561da177e4SLinus Torvalds /* 3578de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 3588de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 3598de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 3608de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 3611da177e4SLinus Torvalds */ 3621da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 36364ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n"); 3641da177e4SLinus Torvalds return; 3651da177e4SLinus Torvalds } 3661da177e4SLinus Torvalds 3671da177e4SLinus Torvalds /* 3681da177e4SLinus Torvalds * Never answer to a ICMP packet. 3691da177e4SLinus Torvalds */ 3701da177e4SLinus Torvalds if (is_ineligible(skb)) { 37164ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n"); 3721da177e4SLinus Torvalds return; 3731da177e4SLinus Torvalds } 3741da177e4SLinus Torvalds 37579383236SMasahide NAKAMURA mip6_addr_swap(skb); 37679383236SMasahide NAKAMURA 3771da177e4SLinus Torvalds memset(&fl, 0, sizeof(fl)); 3781da177e4SLinus Torvalds fl.proto = IPPROTO_ICMPV6; 3791da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_dst, &hdr->saddr); 3801da177e4SLinus Torvalds if (saddr) 3811da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_src, saddr); 3821da177e4SLinus Torvalds fl.oif = iif; 3831da177e4SLinus Torvalds fl.fl_icmp_type = type; 3841da177e4SLinus Torvalds fl.fl_icmp_code = code; 385beb8d13bSVenkat Yekkirala security_skb_classify_flow(skb, &fl); 3861da177e4SLinus Torvalds 3871da177e4SLinus Torvalds if (icmpv6_xmit_lock()) 3881da177e4SLinus Torvalds return; 3891da177e4SLinus Torvalds 39084427d53SYOSHIFUJI Hideaki sk = icmpv6_socket->sk; 39184427d53SYOSHIFUJI Hideaki np = inet6_sk(sk); 39284427d53SYOSHIFUJI Hideaki 3931da177e4SLinus Torvalds if (!icmpv6_xrlim_allow(sk, type, &fl)) 3941da177e4SLinus Torvalds goto out; 3951da177e4SLinus Torvalds 3961da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 3971da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 3981da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 3991da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 4021da177e4SLinus Torvalds fl.oif = np->mcast_oif; 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds err = ip6_dst_lookup(sk, &dst, &fl); 4051da177e4SLinus Torvalds if (err) 4061da177e4SLinus Torvalds goto out; 4078de3351eSYOSHIFUJI Hideaki 4088de3351eSYOSHIFUJI Hideaki /* 4098de3351eSYOSHIFUJI Hideaki * We won't send icmp if the destination is known 4108de3351eSYOSHIFUJI Hideaki * anycast. 4118de3351eSYOSHIFUJI Hideaki */ 4128de3351eSYOSHIFUJI Hideaki if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { 4138de3351eSYOSHIFUJI Hideaki LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n"); 4148de3351eSYOSHIFUJI Hideaki goto out_dst_release; 4158de3351eSYOSHIFUJI Hideaki } 4168de3351eSYOSHIFUJI Hideaki 4171da177e4SLinus Torvalds if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) 418e104411bSPatrick McHardy goto out; 4191da177e4SLinus Torvalds 4201da177e4SLinus Torvalds if (ipv6_addr_is_multicast(&fl.fl6_dst)) 4211da177e4SLinus Torvalds hlimit = np->mcast_hops; 4221da177e4SLinus Torvalds else 4231da177e4SLinus Torvalds hlimit = np->hop_limit; 4241da177e4SLinus Torvalds if (hlimit < 0) 4251da177e4SLinus Torvalds hlimit = dst_metric(dst, RTAX_HOPLIMIT); 4261da177e4SLinus Torvalds if (hlimit < 0) 4271da177e4SLinus Torvalds hlimit = ipv6_get_hoplimit(dst->dev); 4281da177e4SLinus Torvalds 429e012d51cSYOSHIFUJI Hideaki tclass = np->tclass; 43041a1f8eaSYOSHIFUJI Hideaki if (tclass < 0) 43141a1f8eaSYOSHIFUJI Hideaki tclass = 0; 43241a1f8eaSYOSHIFUJI Hideaki 4331da177e4SLinus Torvalds msg.skb = skb; 4341da177e4SLinus Torvalds msg.offset = skb->nh.raw - skb->data; 435763ecff1SYasuyuki Kozakai msg.type = type; 4361da177e4SLinus Torvalds 4371da177e4SLinus Torvalds len = skb->len - msg.offset; 4381da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); 4391da177e4SLinus Torvalds if (len < 0) { 44064ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n"); 4411da177e4SLinus Torvalds goto out_dst_release; 4421da177e4SLinus Torvalds } 4431da177e4SLinus Torvalds 4441da177e4SLinus Torvalds idev = in6_dev_get(skb->dev); 4451da177e4SLinus Torvalds 4461da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, 4471da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 4481da177e4SLinus Torvalds sizeof(struct icmp6hdr), 44941a1f8eaSYOSHIFUJI Hideaki hlimit, tclass, NULL, &fl, (struct rt6_info*)dst, 4501da177e4SLinus Torvalds MSG_DONTWAIT); 4511da177e4SLinus Torvalds if (err) { 4521da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 4531da177e4SLinus Torvalds goto out_put; 4541da177e4SLinus Torvalds } 4551da177e4SLinus Torvalds err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, len + sizeof(struct icmp6hdr)); 4561da177e4SLinus Torvalds 4571da177e4SLinus Torvalds if (type >= ICMPV6_DEST_UNREACH && type <= ICMPV6_PARAMPROB) 4581da177e4SLinus Torvalds ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_OUTDESTUNREACHS, type - ICMPV6_DEST_UNREACH); 4591da177e4SLinus Torvalds ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS); 4601da177e4SLinus Torvalds 4611da177e4SLinus Torvalds out_put: 4621da177e4SLinus Torvalds if (likely(idev != NULL)) 4631da177e4SLinus Torvalds in6_dev_put(idev); 4641da177e4SLinus Torvalds out_dst_release: 4651da177e4SLinus Torvalds dst_release(dst); 4661da177e4SLinus Torvalds out: 4671da177e4SLinus Torvalds icmpv6_xmit_unlock(); 4681da177e4SLinus Torvalds } 4691da177e4SLinus Torvalds 4701da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 4711da177e4SLinus Torvalds { 47284427d53SYOSHIFUJI Hideaki struct sock *sk; 4731da177e4SLinus Torvalds struct inet6_dev *idev; 47484427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 4751da177e4SLinus Torvalds struct in6_addr *saddr = NULL; 4761da177e4SLinus Torvalds struct icmp6hdr *icmph = (struct icmp6hdr *) skb->h.raw; 4771da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 4781da177e4SLinus Torvalds struct flowi fl; 4791da177e4SLinus Torvalds struct icmpv6_msg msg; 4801da177e4SLinus Torvalds struct dst_entry *dst; 4811da177e4SLinus Torvalds int err = 0; 4821da177e4SLinus Torvalds int hlimit; 48341a1f8eaSYOSHIFUJI Hideaki int tclass; 4841da177e4SLinus Torvalds 4851da177e4SLinus Torvalds saddr = &skb->nh.ipv6h->daddr; 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds if (!ipv6_unicast_destination(skb)) 4881da177e4SLinus Torvalds saddr = NULL; 4891da177e4SLinus Torvalds 4901da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 4911da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 4921da177e4SLinus Torvalds 4931da177e4SLinus Torvalds memset(&fl, 0, sizeof(fl)); 4941da177e4SLinus Torvalds fl.proto = IPPROTO_ICMPV6; 4951da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); 4961da177e4SLinus Torvalds if (saddr) 4971da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_src, saddr); 4981da177e4SLinus Torvalds fl.oif = skb->dev->ifindex; 4991da177e4SLinus Torvalds fl.fl_icmp_type = ICMPV6_ECHO_REPLY; 500beb8d13bSVenkat Yekkirala security_skb_classify_flow(skb, &fl); 5011da177e4SLinus Torvalds 5021da177e4SLinus Torvalds if (icmpv6_xmit_lock()) 5031da177e4SLinus Torvalds return; 5041da177e4SLinus Torvalds 50584427d53SYOSHIFUJI Hideaki sk = icmpv6_socket->sk; 50684427d53SYOSHIFUJI Hideaki np = inet6_sk(sk); 50784427d53SYOSHIFUJI Hideaki 5081da177e4SLinus Torvalds if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 5091da177e4SLinus Torvalds fl.oif = np->mcast_oif; 5101da177e4SLinus Torvalds 5111da177e4SLinus Torvalds err = ip6_dst_lookup(sk, &dst, &fl); 5121da177e4SLinus Torvalds if (err) 5131da177e4SLinus Torvalds goto out; 5141da177e4SLinus Torvalds if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) 515e104411bSPatrick McHardy goto out; 5161da177e4SLinus Torvalds 5171da177e4SLinus Torvalds if (ipv6_addr_is_multicast(&fl.fl6_dst)) 5181da177e4SLinus Torvalds hlimit = np->mcast_hops; 5191da177e4SLinus Torvalds else 5201da177e4SLinus Torvalds hlimit = np->hop_limit; 5211da177e4SLinus Torvalds if (hlimit < 0) 5221da177e4SLinus Torvalds hlimit = dst_metric(dst, RTAX_HOPLIMIT); 5231da177e4SLinus Torvalds if (hlimit < 0) 5241da177e4SLinus Torvalds hlimit = ipv6_get_hoplimit(dst->dev); 5251da177e4SLinus Torvalds 526e012d51cSYOSHIFUJI Hideaki tclass = np->tclass; 52741a1f8eaSYOSHIFUJI Hideaki if (tclass < 0) 52841a1f8eaSYOSHIFUJI Hideaki tclass = 0; 52941a1f8eaSYOSHIFUJI Hideaki 5301da177e4SLinus Torvalds idev = in6_dev_get(skb->dev); 5311da177e4SLinus Torvalds 5321da177e4SLinus Torvalds msg.skb = skb; 5331da177e4SLinus Torvalds msg.offset = 0; 534763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 5351da177e4SLinus Torvalds 5361da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 53741a1f8eaSYOSHIFUJI Hideaki sizeof(struct icmp6hdr), hlimit, tclass, NULL, &fl, 5381da177e4SLinus Torvalds (struct rt6_info*)dst, MSG_DONTWAIT); 5391da177e4SLinus Torvalds 5401da177e4SLinus Torvalds if (err) { 5411da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 5421da177e4SLinus Torvalds goto out_put; 5431da177e4SLinus Torvalds } 5441da177e4SLinus Torvalds err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, skb->len + sizeof(struct icmp6hdr)); 5451da177e4SLinus Torvalds 5461da177e4SLinus Torvalds ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTECHOREPLIES); 5471da177e4SLinus Torvalds ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS); 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds out_put: 5501da177e4SLinus Torvalds if (likely(idev != NULL)) 5511da177e4SLinus Torvalds in6_dev_put(idev); 5521da177e4SLinus Torvalds dst_release(dst); 5531da177e4SLinus Torvalds out: 5541da177e4SLinus Torvalds icmpv6_xmit_unlock(); 5551da177e4SLinus Torvalds } 5561da177e4SLinus Torvalds 55704ce6909SAl Viro static void icmpv6_notify(struct sk_buff *skb, int type, int code, __be32 info) 5581da177e4SLinus Torvalds { 5591da177e4SLinus Torvalds struct in6_addr *saddr, *daddr; 5601da177e4SLinus Torvalds struct inet6_protocol *ipprot; 5611da177e4SLinus Torvalds struct sock *sk; 5621da177e4SLinus Torvalds int inner_offset; 5631da177e4SLinus Torvalds int hash; 5641da177e4SLinus Torvalds u8 nexthdr; 5651da177e4SLinus Torvalds 5661da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 5671da177e4SLinus Torvalds return; 5681da177e4SLinus Torvalds 5691da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 5701da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 5711da177e4SLinus Torvalds /* now skip over extension headers */ 5720d3d077cSHerbert Xu inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr); 5731da177e4SLinus Torvalds if (inner_offset<0) 5741da177e4SLinus Torvalds return; 5751da177e4SLinus Torvalds } else { 5761da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 5771da177e4SLinus Torvalds } 5781da177e4SLinus Torvalds 5791da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 5801da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 5811da177e4SLinus Torvalds return; 5821da177e4SLinus Torvalds 5831da177e4SLinus Torvalds saddr = &skb->nh.ipv6h->saddr; 5841da177e4SLinus Torvalds daddr = &skb->nh.ipv6h->daddr; 5851da177e4SLinus Torvalds 5861da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 5871da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 5881da177e4SLinus Torvalds pmtu discovery. 5891da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 5901da177e4SLinus Torvalds --ANK (980726) 5911da177e4SLinus Torvalds */ 5921da177e4SLinus Torvalds 5931da177e4SLinus Torvalds hash = nexthdr & (MAX_INET_PROTOS - 1); 5941da177e4SLinus Torvalds 5951da177e4SLinus Torvalds rcu_read_lock(); 5961da177e4SLinus Torvalds ipprot = rcu_dereference(inet6_protos[hash]); 5971da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 5981da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 5991da177e4SLinus Torvalds rcu_read_unlock(); 6001da177e4SLinus Torvalds 6011da177e4SLinus Torvalds read_lock(&raw_v6_lock); 6021da177e4SLinus Torvalds if ((sk = sk_head(&raw_v6_htable[hash])) != NULL) { 6030bd1b59bSAndrew McDonald while((sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr, 6042dac4b96SYOSHIFUJI Hideaki IP6CB(skb)->iif))) { 6051da177e4SLinus Torvalds rawv6_err(sk, skb, NULL, type, code, inner_offset, info); 6061da177e4SLinus Torvalds sk = sk_next(sk); 6071da177e4SLinus Torvalds } 6081da177e4SLinus Torvalds } 6091da177e4SLinus Torvalds read_unlock(&raw_v6_lock); 6101da177e4SLinus Torvalds } 6111da177e4SLinus Torvalds 6121da177e4SLinus Torvalds /* 6131da177e4SLinus Torvalds * Handle icmp messages 6141da177e4SLinus Torvalds */ 6151da177e4SLinus Torvalds 616951dbc8aSPatrick McHardy static int icmpv6_rcv(struct sk_buff **pskb) 6171da177e4SLinus Torvalds { 6181da177e4SLinus Torvalds struct sk_buff *skb = *pskb; 6191da177e4SLinus Torvalds struct net_device *dev = skb->dev; 6201da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 6211da177e4SLinus Torvalds struct in6_addr *saddr, *daddr; 6221da177e4SLinus Torvalds struct ipv6hdr *orig_hdr; 6231da177e4SLinus Torvalds struct icmp6hdr *hdr; 6241da177e4SLinus Torvalds int type; 6251da177e4SLinus Torvalds 6261da177e4SLinus Torvalds ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INMSGS); 6271da177e4SLinus Torvalds 6281da177e4SLinus Torvalds saddr = &skb->nh.ipv6h->saddr; 6291da177e4SLinus Torvalds daddr = &skb->nh.ipv6h->daddr; 6301da177e4SLinus Torvalds 6311da177e4SLinus Torvalds /* Perform checksum. */ 632fb286bb2SHerbert Xu switch (skb->ip_summed) { 63384fa7933SPatrick McHardy case CHECKSUM_COMPLETE: 634fb286bb2SHerbert Xu if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, 635fb286bb2SHerbert Xu skb->csum)) 636fb286bb2SHerbert Xu break; 637fb286bb2SHerbert Xu /* fall through */ 638fb286bb2SHerbert Xu case CHECKSUM_NONE: 639868c86bcSAl Viro skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len, 640868c86bcSAl Viro IPPROTO_ICMPV6, 0)); 641fb286bb2SHerbert Xu if (__skb_checksum_complete(skb)) { 64246b86a2dSJoe Perches LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [" NIP6_FMT " > " NIP6_FMT "]\n", 64364ce2073SPatrick McHardy NIP6(*saddr), NIP6(*daddr)); 6441da177e4SLinus Torvalds goto discard_it; 6451da177e4SLinus Torvalds } 6461da177e4SLinus Torvalds } 6471da177e4SLinus Torvalds 6481da177e4SLinus Torvalds if (!pskb_pull(skb, sizeof(struct icmp6hdr))) 6491da177e4SLinus Torvalds goto discard_it; 6501da177e4SLinus Torvalds 6511da177e4SLinus Torvalds hdr = (struct icmp6hdr *) skb->h.raw; 6521da177e4SLinus Torvalds 6531da177e4SLinus Torvalds type = hdr->icmp6_type; 6541da177e4SLinus Torvalds 6551da177e4SLinus Torvalds if (type >= ICMPV6_DEST_UNREACH && type <= ICMPV6_PARAMPROB) 6561da177e4SLinus Torvalds ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_INDESTUNREACHS, type - ICMPV6_DEST_UNREACH); 6571da177e4SLinus Torvalds else if (type >= ICMPV6_ECHO_REQUEST && type <= NDISC_REDIRECT) 6581da177e4SLinus Torvalds ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_INECHOS, type - ICMPV6_ECHO_REQUEST); 6591da177e4SLinus Torvalds 6601da177e4SLinus Torvalds switch (type) { 6611da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 6621da177e4SLinus Torvalds icmpv6_echo_reply(skb); 6631da177e4SLinus Torvalds break; 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 6661da177e4SLinus Torvalds /* we couldn't care less */ 6671da177e4SLinus Torvalds break; 6681da177e4SLinus Torvalds 6691da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 6701da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 6711da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 6721da177e4SLinus Torvalds destination cache will allow to solve this problem 6731da177e4SLinus Torvalds --ANK (980726) 6741da177e4SLinus Torvalds */ 6751da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 6761da177e4SLinus Torvalds goto discard_it; 6771da177e4SLinus Torvalds hdr = (struct icmp6hdr *) skb->h.raw; 6781da177e4SLinus Torvalds orig_hdr = (struct ipv6hdr *) (hdr + 1); 6791da177e4SLinus Torvalds rt6_pmtu_discovery(&orig_hdr->daddr, &orig_hdr->saddr, dev, 6801da177e4SLinus Torvalds ntohl(hdr->icmp6_mtu)); 6811da177e4SLinus Torvalds 6821da177e4SLinus Torvalds /* 6831da177e4SLinus Torvalds * Drop through to notify 6841da177e4SLinus Torvalds */ 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 6871da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 6881da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 6891da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 6901da177e4SLinus Torvalds break; 6911da177e4SLinus Torvalds 6921da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 6931da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 6941da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 6951da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 6961da177e4SLinus Torvalds case NDISC_REDIRECT: 6971da177e4SLinus Torvalds ndisc_rcv(skb); 6981da177e4SLinus Torvalds break; 6991da177e4SLinus Torvalds 7001da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 7011da177e4SLinus Torvalds igmp6_event_query(skb); 7021da177e4SLinus Torvalds break; 7031da177e4SLinus Torvalds 7041da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 7051da177e4SLinus Torvalds igmp6_event_report(skb); 7061da177e4SLinus Torvalds break; 7071da177e4SLinus Torvalds 7081da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 7091da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 7101da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 7111da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 7121da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 7131da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 7141da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 7151da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 7161da177e4SLinus Torvalds break; 7171da177e4SLinus Torvalds 7181da177e4SLinus Torvalds default: 71964ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n"); 7201da177e4SLinus Torvalds 7211da177e4SLinus Torvalds /* informational */ 7221da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 7231da177e4SLinus Torvalds break; 7241da177e4SLinus Torvalds 7251da177e4SLinus Torvalds /* 7261da177e4SLinus Torvalds * error of unknown type. 7271da177e4SLinus Torvalds * must pass to upper level 7281da177e4SLinus Torvalds */ 7291da177e4SLinus Torvalds 7301da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7311da177e4SLinus Torvalds }; 7321da177e4SLinus Torvalds kfree_skb(skb); 7331da177e4SLinus Torvalds return 0; 7341da177e4SLinus Torvalds 7351da177e4SLinus Torvalds discard_it: 7361da177e4SLinus Torvalds ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS); 7371da177e4SLinus Torvalds kfree_skb(skb); 7381da177e4SLinus Torvalds return 0; 7391da177e4SLinus Torvalds } 7401da177e4SLinus Torvalds 741640c41c7SIngo Molnar /* 742640c41c7SIngo Molnar * Special lock-class for __icmpv6_socket: 743640c41c7SIngo Molnar */ 744640c41c7SIngo Molnar static struct lock_class_key icmpv6_socket_sk_dst_lock_key; 745640c41c7SIngo Molnar 7461da177e4SLinus Torvalds int __init icmpv6_init(struct net_proto_family *ops) 7471da177e4SLinus Torvalds { 7481da177e4SLinus Torvalds struct sock *sk; 7491da177e4SLinus Torvalds int err, i, j; 7501da177e4SLinus Torvalds 7516f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 7521da177e4SLinus Torvalds err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, 7531da177e4SLinus Torvalds &per_cpu(__icmpv6_socket, i)); 7541da177e4SLinus Torvalds if (err < 0) { 7551da177e4SLinus Torvalds printk(KERN_ERR 7561da177e4SLinus Torvalds "Failed to initialize the ICMP6 control socket " 7571da177e4SLinus Torvalds "(err %d).\n", 7581da177e4SLinus Torvalds err); 7591da177e4SLinus Torvalds goto fail; 7601da177e4SLinus Torvalds } 7611da177e4SLinus Torvalds 7621da177e4SLinus Torvalds sk = per_cpu(__icmpv6_socket, i)->sk; 7631da177e4SLinus Torvalds sk->sk_allocation = GFP_ATOMIC; 764640c41c7SIngo Molnar /* 765640c41c7SIngo Molnar * Split off their lock-class, because sk->sk_dst_lock 766640c41c7SIngo Molnar * gets used from softirqs, which is safe for 767640c41c7SIngo Molnar * __icmpv6_socket (because those never get directly used 768640c41c7SIngo Molnar * via userspace syscalls), but unsafe for normal sockets. 769640c41c7SIngo Molnar */ 770640c41c7SIngo Molnar lockdep_set_class(&sk->sk_dst_lock, 771640c41c7SIngo Molnar &icmpv6_socket_sk_dst_lock_key); 7721da177e4SLinus Torvalds 7731da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 7741da177e4SLinus Torvalds * sk_buff struct overhead. 7751da177e4SLinus Torvalds */ 7761da177e4SLinus Torvalds sk->sk_sndbuf = 7771da177e4SLinus Torvalds (2 * ((64 * 1024) + sizeof(struct sk_buff))); 7781da177e4SLinus Torvalds 7791da177e4SLinus Torvalds sk->sk_prot->unhash(sk); 7801da177e4SLinus Torvalds } 7811da177e4SLinus Torvalds 7821da177e4SLinus Torvalds 7831da177e4SLinus Torvalds if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) { 7841da177e4SLinus Torvalds printk(KERN_ERR "Failed to register ICMP6 protocol\n"); 7851da177e4SLinus Torvalds err = -EAGAIN; 7861da177e4SLinus Torvalds goto fail; 7871da177e4SLinus Torvalds } 7881da177e4SLinus Torvalds 7891da177e4SLinus Torvalds return 0; 7901da177e4SLinus Torvalds 7911da177e4SLinus Torvalds fail: 7921da177e4SLinus Torvalds for (j = 0; j < i; j++) { 7931da177e4SLinus Torvalds if (!cpu_possible(j)) 7941da177e4SLinus Torvalds continue; 7951da177e4SLinus Torvalds sock_release(per_cpu(__icmpv6_socket, j)); 7961da177e4SLinus Torvalds } 7971da177e4SLinus Torvalds 7981da177e4SLinus Torvalds return err; 7991da177e4SLinus Torvalds } 8001da177e4SLinus Torvalds 8011da177e4SLinus Torvalds void icmpv6_cleanup(void) 8021da177e4SLinus Torvalds { 8031da177e4SLinus Torvalds int i; 8041da177e4SLinus Torvalds 8056f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8061da177e4SLinus Torvalds sock_release(per_cpu(__icmpv6_socket, i)); 8071da177e4SLinus Torvalds } 8081da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 8091da177e4SLinus Torvalds } 8101da177e4SLinus Torvalds 8119b5b5cffSArjan van de Ven static const struct icmp6_err { 8121da177e4SLinus Torvalds int err; 8131da177e4SLinus Torvalds int fatal; 8141da177e4SLinus Torvalds } tab_unreach[] = { 8151da177e4SLinus Torvalds { /* NOROUTE */ 8161da177e4SLinus Torvalds .err = ENETUNREACH, 8171da177e4SLinus Torvalds .fatal = 0, 8181da177e4SLinus Torvalds }, 8191da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 8201da177e4SLinus Torvalds .err = EACCES, 8211da177e4SLinus Torvalds .fatal = 1, 8221da177e4SLinus Torvalds }, 8231da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 8241da177e4SLinus Torvalds .err = EHOSTUNREACH, 8251da177e4SLinus Torvalds .fatal = 0, 8261da177e4SLinus Torvalds }, 8271da177e4SLinus Torvalds { /* ADDR_UNREACH */ 8281da177e4SLinus Torvalds .err = EHOSTUNREACH, 8291da177e4SLinus Torvalds .fatal = 0, 8301da177e4SLinus Torvalds }, 8311da177e4SLinus Torvalds { /* PORT_UNREACH */ 8321da177e4SLinus Torvalds .err = ECONNREFUSED, 8331da177e4SLinus Torvalds .fatal = 1, 8341da177e4SLinus Torvalds }, 8351da177e4SLinus Torvalds }; 8361da177e4SLinus Torvalds 8371da177e4SLinus Torvalds int icmpv6_err_convert(int type, int code, int *err) 8381da177e4SLinus Torvalds { 8391da177e4SLinus Torvalds int fatal = 0; 8401da177e4SLinus Torvalds 8411da177e4SLinus Torvalds *err = EPROTO; 8421da177e4SLinus Torvalds 8431da177e4SLinus Torvalds switch (type) { 8441da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 8451da177e4SLinus Torvalds fatal = 1; 8461da177e4SLinus Torvalds if (code <= ICMPV6_PORT_UNREACH) { 8471da177e4SLinus Torvalds *err = tab_unreach[code].err; 8481da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 8491da177e4SLinus Torvalds } 8501da177e4SLinus Torvalds break; 8511da177e4SLinus Torvalds 8521da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 8531da177e4SLinus Torvalds *err = EMSGSIZE; 8541da177e4SLinus Torvalds break; 8551da177e4SLinus Torvalds 8561da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 8571da177e4SLinus Torvalds *err = EPROTO; 8581da177e4SLinus Torvalds fatal = 1; 8591da177e4SLinus Torvalds break; 8601da177e4SLinus Torvalds 8611da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 8621da177e4SLinus Torvalds *err = EHOSTUNREACH; 8631da177e4SLinus Torvalds break; 8641da177e4SLinus Torvalds }; 8651da177e4SLinus Torvalds 8661da177e4SLinus Torvalds return fatal; 8671da177e4SLinus Torvalds } 8681da177e4SLinus Torvalds 8691da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 8701da177e4SLinus Torvalds ctl_table ipv6_icmp_table[] = { 8711da177e4SLinus Torvalds { 8721da177e4SLinus Torvalds .ctl_name = NET_IPV6_ICMP_RATELIMIT, 8731da177e4SLinus Torvalds .procname = "ratelimit", 8741da177e4SLinus Torvalds .data = &sysctl_icmpv6_time, 8751da177e4SLinus Torvalds .maxlen = sizeof(int), 8761da177e4SLinus Torvalds .mode = 0644, 8771da177e4SLinus Torvalds .proc_handler = &proc_dointvec 8781da177e4SLinus Torvalds }, 8791da177e4SLinus Torvalds { .ctl_name = 0 }, 8801da177e4SLinus Torvalds }; 8811da177e4SLinus Torvalds #endif 8821da177e4SLinus Torvalds 883