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 { 2371da177e4SLinus Torvalds u32 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); 2451da177e4SLinus Torvalds tmp_csum = csum_ipv6_magic(&fl->fl6_src, 2461da177e4SLinus Torvalds &fl->fl6_dst, 2471da177e4SLinus Torvalds len, fl->proto, tmp_csum); 2481da177e4SLinus Torvalds icmp6h->icmp6_cksum = tmp_csum; 2491da177e4SLinus Torvalds } 2501da177e4SLinus Torvalds if (icmp6h->icmp6_cksum == 0) 2511da177e4SLinus Torvalds icmp6h->icmp6_cksum = -1; 2521da177e4SLinus Torvalds ip6_push_pending_frames(sk); 2531da177e4SLinus Torvalds out: 2541da177e4SLinus Torvalds return err; 2551da177e4SLinus Torvalds } 2561da177e4SLinus Torvalds 2571da177e4SLinus Torvalds struct icmpv6_msg { 2581da177e4SLinus Torvalds struct sk_buff *skb; 2591da177e4SLinus Torvalds int offset; 260763ecff1SYasuyuki Kozakai uint8_t type; 2611da177e4SLinus Torvalds }; 2621da177e4SLinus Torvalds 2631da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 2641da177e4SLinus Torvalds { 2651da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 2661da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 2671da177e4SLinus Torvalds __u32 csum = 0; 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 2701da177e4SLinus Torvalds to, len, csum); 2711da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 272763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 273763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 2741da177e4SLinus Torvalds return 0; 2751da177e4SLinus Torvalds } 2761da177e4SLinus Torvalds 27779383236SMasahide NAKAMURA #ifdef CONFIG_IPV6_MIP6 27879383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 27979383236SMasahide NAKAMURA { 28079383236SMasahide NAKAMURA struct ipv6hdr *iph = skb->nh.ipv6h; 28179383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 28279383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 28379383236SMasahide NAKAMURA struct in6_addr tmp; 28479383236SMasahide NAKAMURA int off; 28579383236SMasahide NAKAMURA 28679383236SMasahide NAKAMURA if (opt->dsthao) { 28779383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 28879383236SMasahide NAKAMURA if (likely(off >= 0)) { 28979383236SMasahide NAKAMURA hao = (struct ipv6_destopt_hao *)(skb->nh.raw + off); 29079383236SMasahide NAKAMURA ipv6_addr_copy(&tmp, &iph->saddr); 29179383236SMasahide NAKAMURA ipv6_addr_copy(&iph->saddr, &hao->addr); 29279383236SMasahide NAKAMURA ipv6_addr_copy(&hao->addr, &tmp); 29379383236SMasahide NAKAMURA } 29479383236SMasahide NAKAMURA } 29579383236SMasahide NAKAMURA } 29679383236SMasahide NAKAMURA #else 29779383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 29879383236SMasahide NAKAMURA #endif 29979383236SMasahide NAKAMURA 3001da177e4SLinus Torvalds /* 3011da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 3021da177e4SLinus Torvalds */ 3031da177e4SLinus Torvalds void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info, 3041da177e4SLinus Torvalds struct net_device *dev) 3051da177e4SLinus Torvalds { 3061da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 3071da177e4SLinus Torvalds struct ipv6hdr *hdr = skb->nh.ipv6h; 30884427d53SYOSHIFUJI Hideaki struct sock *sk; 30984427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 3101da177e4SLinus Torvalds struct in6_addr *saddr = NULL; 3111da177e4SLinus Torvalds struct dst_entry *dst; 3121da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 3131da177e4SLinus Torvalds struct flowi fl; 3141da177e4SLinus Torvalds struct icmpv6_msg msg; 3151da177e4SLinus Torvalds int iif = 0; 3161da177e4SLinus Torvalds int addr_type = 0; 3171da177e4SLinus Torvalds int len; 31841a1f8eaSYOSHIFUJI Hideaki int hlimit, tclass; 3191da177e4SLinus Torvalds int err = 0; 3201da177e4SLinus Torvalds 3211da177e4SLinus Torvalds if ((u8*)hdr < skb->head || (u8*)(hdr+1) > skb->tail) 3221da177e4SLinus Torvalds return; 3231da177e4SLinus Torvalds 3241da177e4SLinus Torvalds /* 3251da177e4SLinus Torvalds * Make sure we respect the rules 3261da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 3271da177e4SLinus Torvalds * Rule (e.1) is enforced by not using icmpv6_send 3281da177e4SLinus Torvalds * in any code that processes icmp errors. 3291da177e4SLinus Torvalds */ 3301da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 3311da177e4SLinus Torvalds 3321da177e4SLinus Torvalds if (ipv6_chk_addr(&hdr->daddr, skb->dev, 0)) 3331da177e4SLinus Torvalds saddr = &hdr->daddr; 3341da177e4SLinus Torvalds 3351da177e4SLinus Torvalds /* 3361da177e4SLinus Torvalds * Dest addr check 3371da177e4SLinus Torvalds */ 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) { 3401da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 3411da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 3421da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 3431da177e4SLinus Torvalds (opt_unrec(skb, info)))) 3441da177e4SLinus Torvalds return; 3451da177e4SLinus Torvalds 3461da177e4SLinus Torvalds saddr = NULL; 3471da177e4SLinus Torvalds } 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds /* 3521da177e4SLinus Torvalds * Source addr check 3531da177e4SLinus Torvalds */ 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds if (addr_type & IPV6_ADDR_LINKLOCAL) 3561da177e4SLinus Torvalds iif = skb->dev->ifindex; 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvalds /* 3598de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 3608de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 3618de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 3628de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 3631da177e4SLinus Torvalds */ 3641da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 36564ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n"); 3661da177e4SLinus Torvalds return; 3671da177e4SLinus Torvalds } 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvalds /* 3701da177e4SLinus Torvalds * Never answer to a ICMP packet. 3711da177e4SLinus Torvalds */ 3721da177e4SLinus Torvalds if (is_ineligible(skb)) { 37364ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n"); 3741da177e4SLinus Torvalds return; 3751da177e4SLinus Torvalds } 3761da177e4SLinus Torvalds 37779383236SMasahide NAKAMURA mip6_addr_swap(skb); 37879383236SMasahide NAKAMURA 3791da177e4SLinus Torvalds memset(&fl, 0, sizeof(fl)); 3801da177e4SLinus Torvalds fl.proto = IPPROTO_ICMPV6; 3811da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_dst, &hdr->saddr); 3821da177e4SLinus Torvalds if (saddr) 3831da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_src, saddr); 3841da177e4SLinus Torvalds fl.oif = iif; 3851da177e4SLinus Torvalds fl.fl_icmp_type = type; 3861da177e4SLinus Torvalds fl.fl_icmp_code = code; 387beb8d13bSVenkat Yekkirala security_skb_classify_flow(skb, &fl); 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds if (icmpv6_xmit_lock()) 3901da177e4SLinus Torvalds return; 3911da177e4SLinus Torvalds 39284427d53SYOSHIFUJI Hideaki sk = icmpv6_socket->sk; 39384427d53SYOSHIFUJI Hideaki np = inet6_sk(sk); 39484427d53SYOSHIFUJI Hideaki 3951da177e4SLinus Torvalds if (!icmpv6_xrlim_allow(sk, type, &fl)) 3961da177e4SLinus Torvalds goto out; 3971da177e4SLinus Torvalds 3981da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 3991da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 4001da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 4011da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 4021da177e4SLinus Torvalds 4031da177e4SLinus Torvalds if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 4041da177e4SLinus Torvalds fl.oif = np->mcast_oif; 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds err = ip6_dst_lookup(sk, &dst, &fl); 4071da177e4SLinus Torvalds if (err) 4081da177e4SLinus Torvalds goto out; 4098de3351eSYOSHIFUJI Hideaki 4108de3351eSYOSHIFUJI Hideaki /* 4118de3351eSYOSHIFUJI Hideaki * We won't send icmp if the destination is known 4128de3351eSYOSHIFUJI Hideaki * anycast. 4138de3351eSYOSHIFUJI Hideaki */ 4148de3351eSYOSHIFUJI Hideaki if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { 4158de3351eSYOSHIFUJI Hideaki LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n"); 4168de3351eSYOSHIFUJI Hideaki goto out_dst_release; 4178de3351eSYOSHIFUJI Hideaki } 4188de3351eSYOSHIFUJI Hideaki 4191da177e4SLinus Torvalds if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) 420e104411bSPatrick McHardy goto out; 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds if (ipv6_addr_is_multicast(&fl.fl6_dst)) 4231da177e4SLinus Torvalds hlimit = np->mcast_hops; 4241da177e4SLinus Torvalds else 4251da177e4SLinus Torvalds hlimit = np->hop_limit; 4261da177e4SLinus Torvalds if (hlimit < 0) 4271da177e4SLinus Torvalds hlimit = dst_metric(dst, RTAX_HOPLIMIT); 4281da177e4SLinus Torvalds if (hlimit < 0) 4291da177e4SLinus Torvalds hlimit = ipv6_get_hoplimit(dst->dev); 4301da177e4SLinus Torvalds 431e012d51cSYOSHIFUJI Hideaki tclass = np->tclass; 43241a1f8eaSYOSHIFUJI Hideaki if (tclass < 0) 43341a1f8eaSYOSHIFUJI Hideaki tclass = 0; 43441a1f8eaSYOSHIFUJI Hideaki 4351da177e4SLinus Torvalds msg.skb = skb; 4361da177e4SLinus Torvalds msg.offset = skb->nh.raw - skb->data; 437763ecff1SYasuyuki Kozakai msg.type = type; 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds len = skb->len - msg.offset; 4401da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); 4411da177e4SLinus Torvalds if (len < 0) { 44264ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n"); 4431da177e4SLinus Torvalds goto out_dst_release; 4441da177e4SLinus Torvalds } 4451da177e4SLinus Torvalds 4461da177e4SLinus Torvalds idev = in6_dev_get(skb->dev); 4471da177e4SLinus Torvalds 4481da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, 4491da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 4501da177e4SLinus Torvalds sizeof(struct icmp6hdr), 45141a1f8eaSYOSHIFUJI Hideaki hlimit, tclass, NULL, &fl, (struct rt6_info*)dst, 4521da177e4SLinus Torvalds MSG_DONTWAIT); 4531da177e4SLinus Torvalds if (err) { 4541da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 4551da177e4SLinus Torvalds goto out_put; 4561da177e4SLinus Torvalds } 4571da177e4SLinus Torvalds err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, len + sizeof(struct icmp6hdr)); 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds if (type >= ICMPV6_DEST_UNREACH && type <= ICMPV6_PARAMPROB) 4601da177e4SLinus Torvalds ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_OUTDESTUNREACHS, type - ICMPV6_DEST_UNREACH); 4611da177e4SLinus Torvalds ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS); 4621da177e4SLinus Torvalds 4631da177e4SLinus Torvalds out_put: 4641da177e4SLinus Torvalds if (likely(idev != NULL)) 4651da177e4SLinus Torvalds in6_dev_put(idev); 4661da177e4SLinus Torvalds out_dst_release: 4671da177e4SLinus Torvalds dst_release(dst); 4681da177e4SLinus Torvalds out: 4691da177e4SLinus Torvalds icmpv6_xmit_unlock(); 4701da177e4SLinus Torvalds } 4711da177e4SLinus Torvalds 4721da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 4731da177e4SLinus Torvalds { 47484427d53SYOSHIFUJI Hideaki struct sock *sk; 4751da177e4SLinus Torvalds struct inet6_dev *idev; 47684427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 4771da177e4SLinus Torvalds struct in6_addr *saddr = NULL; 4781da177e4SLinus Torvalds struct icmp6hdr *icmph = (struct icmp6hdr *) skb->h.raw; 4791da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 4801da177e4SLinus Torvalds struct flowi fl; 4811da177e4SLinus Torvalds struct icmpv6_msg msg; 4821da177e4SLinus Torvalds struct dst_entry *dst; 4831da177e4SLinus Torvalds int err = 0; 4841da177e4SLinus Torvalds int hlimit; 48541a1f8eaSYOSHIFUJI Hideaki int tclass; 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds saddr = &skb->nh.ipv6h->daddr; 4881da177e4SLinus Torvalds 4891da177e4SLinus Torvalds if (!ipv6_unicast_destination(skb)) 4901da177e4SLinus Torvalds saddr = NULL; 4911da177e4SLinus Torvalds 4921da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 4931da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 4941da177e4SLinus Torvalds 4951da177e4SLinus Torvalds memset(&fl, 0, sizeof(fl)); 4961da177e4SLinus Torvalds fl.proto = IPPROTO_ICMPV6; 4971da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); 4981da177e4SLinus Torvalds if (saddr) 4991da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_src, saddr); 5001da177e4SLinus Torvalds fl.oif = skb->dev->ifindex; 5011da177e4SLinus Torvalds fl.fl_icmp_type = ICMPV6_ECHO_REPLY; 502beb8d13bSVenkat Yekkirala security_skb_classify_flow(skb, &fl); 5031da177e4SLinus Torvalds 5041da177e4SLinus Torvalds if (icmpv6_xmit_lock()) 5051da177e4SLinus Torvalds return; 5061da177e4SLinus Torvalds 50784427d53SYOSHIFUJI Hideaki sk = icmpv6_socket->sk; 50884427d53SYOSHIFUJI Hideaki np = inet6_sk(sk); 50984427d53SYOSHIFUJI Hideaki 5101da177e4SLinus Torvalds if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 5111da177e4SLinus Torvalds fl.oif = np->mcast_oif; 5121da177e4SLinus Torvalds 5131da177e4SLinus Torvalds err = ip6_dst_lookup(sk, &dst, &fl); 5141da177e4SLinus Torvalds if (err) 5151da177e4SLinus Torvalds goto out; 5161da177e4SLinus Torvalds if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) 517e104411bSPatrick McHardy goto out; 5181da177e4SLinus Torvalds 5191da177e4SLinus Torvalds if (ipv6_addr_is_multicast(&fl.fl6_dst)) 5201da177e4SLinus Torvalds hlimit = np->mcast_hops; 5211da177e4SLinus Torvalds else 5221da177e4SLinus Torvalds hlimit = np->hop_limit; 5231da177e4SLinus Torvalds if (hlimit < 0) 5241da177e4SLinus Torvalds hlimit = dst_metric(dst, RTAX_HOPLIMIT); 5251da177e4SLinus Torvalds if (hlimit < 0) 5261da177e4SLinus Torvalds hlimit = ipv6_get_hoplimit(dst->dev); 5271da177e4SLinus Torvalds 528e012d51cSYOSHIFUJI Hideaki tclass = np->tclass; 52941a1f8eaSYOSHIFUJI Hideaki if (tclass < 0) 53041a1f8eaSYOSHIFUJI Hideaki tclass = 0; 53141a1f8eaSYOSHIFUJI Hideaki 5321da177e4SLinus Torvalds idev = in6_dev_get(skb->dev); 5331da177e4SLinus Torvalds 5341da177e4SLinus Torvalds msg.skb = skb; 5351da177e4SLinus Torvalds msg.offset = 0; 536763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 5371da177e4SLinus Torvalds 5381da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 53941a1f8eaSYOSHIFUJI Hideaki sizeof(struct icmp6hdr), hlimit, tclass, NULL, &fl, 5401da177e4SLinus Torvalds (struct rt6_info*)dst, MSG_DONTWAIT); 5411da177e4SLinus Torvalds 5421da177e4SLinus Torvalds if (err) { 5431da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 5441da177e4SLinus Torvalds goto out_put; 5451da177e4SLinus Torvalds } 5461da177e4SLinus Torvalds err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, skb->len + sizeof(struct icmp6hdr)); 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvalds ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTECHOREPLIES); 5491da177e4SLinus Torvalds ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS); 5501da177e4SLinus Torvalds 5511da177e4SLinus Torvalds out_put: 5521da177e4SLinus Torvalds if (likely(idev != NULL)) 5531da177e4SLinus Torvalds in6_dev_put(idev); 5541da177e4SLinus Torvalds dst_release(dst); 5551da177e4SLinus Torvalds out: 5561da177e4SLinus Torvalds icmpv6_xmit_unlock(); 5571da177e4SLinus Torvalds } 5581da177e4SLinus Torvalds 55904ce6909SAl Viro static void icmpv6_notify(struct sk_buff *skb, int type, int code, __be32 info) 5601da177e4SLinus Torvalds { 5611da177e4SLinus Torvalds struct in6_addr *saddr, *daddr; 5621da177e4SLinus Torvalds struct inet6_protocol *ipprot; 5631da177e4SLinus Torvalds struct sock *sk; 5641da177e4SLinus Torvalds int inner_offset; 5651da177e4SLinus Torvalds int hash; 5661da177e4SLinus Torvalds u8 nexthdr; 5671da177e4SLinus Torvalds 5681da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 5691da177e4SLinus Torvalds return; 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 5721da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 5731da177e4SLinus Torvalds /* now skip over extension headers */ 5740d3d077cSHerbert Xu inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr); 5751da177e4SLinus Torvalds if (inner_offset<0) 5761da177e4SLinus Torvalds return; 5771da177e4SLinus Torvalds } else { 5781da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 5791da177e4SLinus Torvalds } 5801da177e4SLinus Torvalds 5811da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 5821da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 5831da177e4SLinus Torvalds return; 5841da177e4SLinus Torvalds 5851da177e4SLinus Torvalds saddr = &skb->nh.ipv6h->saddr; 5861da177e4SLinus Torvalds daddr = &skb->nh.ipv6h->daddr; 5871da177e4SLinus Torvalds 5881da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 5891da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 5901da177e4SLinus Torvalds pmtu discovery. 5911da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 5921da177e4SLinus Torvalds --ANK (980726) 5931da177e4SLinus Torvalds */ 5941da177e4SLinus Torvalds 5951da177e4SLinus Torvalds hash = nexthdr & (MAX_INET_PROTOS - 1); 5961da177e4SLinus Torvalds 5971da177e4SLinus Torvalds rcu_read_lock(); 5981da177e4SLinus Torvalds ipprot = rcu_dereference(inet6_protos[hash]); 5991da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 6001da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 6011da177e4SLinus Torvalds rcu_read_unlock(); 6021da177e4SLinus Torvalds 6031da177e4SLinus Torvalds read_lock(&raw_v6_lock); 6041da177e4SLinus Torvalds if ((sk = sk_head(&raw_v6_htable[hash])) != NULL) { 6050bd1b59bSAndrew McDonald while((sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr, 6062dac4b96SYOSHIFUJI Hideaki IP6CB(skb)->iif))) { 6071da177e4SLinus Torvalds rawv6_err(sk, skb, NULL, type, code, inner_offset, info); 6081da177e4SLinus Torvalds sk = sk_next(sk); 6091da177e4SLinus Torvalds } 6101da177e4SLinus Torvalds } 6111da177e4SLinus Torvalds read_unlock(&raw_v6_lock); 6121da177e4SLinus Torvalds } 6131da177e4SLinus Torvalds 6141da177e4SLinus Torvalds /* 6151da177e4SLinus Torvalds * Handle icmp messages 6161da177e4SLinus Torvalds */ 6171da177e4SLinus Torvalds 618951dbc8aSPatrick McHardy static int icmpv6_rcv(struct sk_buff **pskb) 6191da177e4SLinus Torvalds { 6201da177e4SLinus Torvalds struct sk_buff *skb = *pskb; 6211da177e4SLinus Torvalds struct net_device *dev = skb->dev; 6221da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 6231da177e4SLinus Torvalds struct in6_addr *saddr, *daddr; 6241da177e4SLinus Torvalds struct ipv6hdr *orig_hdr; 6251da177e4SLinus Torvalds struct icmp6hdr *hdr; 6261da177e4SLinus Torvalds int type; 6271da177e4SLinus Torvalds 6281da177e4SLinus Torvalds ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INMSGS); 6291da177e4SLinus Torvalds 6301da177e4SLinus Torvalds saddr = &skb->nh.ipv6h->saddr; 6311da177e4SLinus Torvalds daddr = &skb->nh.ipv6h->daddr; 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds /* Perform checksum. */ 634fb286bb2SHerbert Xu switch (skb->ip_summed) { 63584fa7933SPatrick McHardy case CHECKSUM_COMPLETE: 636fb286bb2SHerbert Xu if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, 637fb286bb2SHerbert Xu skb->csum)) 638fb286bb2SHerbert Xu break; 639fb286bb2SHerbert Xu /* fall through */ 640fb286bb2SHerbert Xu case CHECKSUM_NONE: 641fb286bb2SHerbert Xu skb->csum = ~csum_ipv6_magic(saddr, daddr, skb->len, 642fb286bb2SHerbert Xu IPPROTO_ICMPV6, 0); 643fb286bb2SHerbert Xu if (__skb_checksum_complete(skb)) { 64446b86a2dSJoe Perches LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [" NIP6_FMT " > " NIP6_FMT "]\n", 64564ce2073SPatrick McHardy NIP6(*saddr), NIP6(*daddr)); 6461da177e4SLinus Torvalds goto discard_it; 6471da177e4SLinus Torvalds } 6481da177e4SLinus Torvalds } 6491da177e4SLinus Torvalds 6501da177e4SLinus Torvalds if (!pskb_pull(skb, sizeof(struct icmp6hdr))) 6511da177e4SLinus Torvalds goto discard_it; 6521da177e4SLinus Torvalds 6531da177e4SLinus Torvalds hdr = (struct icmp6hdr *) skb->h.raw; 6541da177e4SLinus Torvalds 6551da177e4SLinus Torvalds type = hdr->icmp6_type; 6561da177e4SLinus Torvalds 6571da177e4SLinus Torvalds if (type >= ICMPV6_DEST_UNREACH && type <= ICMPV6_PARAMPROB) 6581da177e4SLinus Torvalds ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_INDESTUNREACHS, type - ICMPV6_DEST_UNREACH); 6591da177e4SLinus Torvalds else if (type >= ICMPV6_ECHO_REQUEST && type <= NDISC_REDIRECT) 6601da177e4SLinus Torvalds ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_INECHOS, type - ICMPV6_ECHO_REQUEST); 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds switch (type) { 6631da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 6641da177e4SLinus Torvalds icmpv6_echo_reply(skb); 6651da177e4SLinus Torvalds break; 6661da177e4SLinus Torvalds 6671da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 6681da177e4SLinus Torvalds /* we couldn't care less */ 6691da177e4SLinus Torvalds break; 6701da177e4SLinus Torvalds 6711da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 6721da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 6731da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 6741da177e4SLinus Torvalds destination cache will allow to solve this problem 6751da177e4SLinus Torvalds --ANK (980726) 6761da177e4SLinus Torvalds */ 6771da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 6781da177e4SLinus Torvalds goto discard_it; 6791da177e4SLinus Torvalds hdr = (struct icmp6hdr *) skb->h.raw; 6801da177e4SLinus Torvalds orig_hdr = (struct ipv6hdr *) (hdr + 1); 6811da177e4SLinus Torvalds rt6_pmtu_discovery(&orig_hdr->daddr, &orig_hdr->saddr, dev, 6821da177e4SLinus Torvalds ntohl(hdr->icmp6_mtu)); 6831da177e4SLinus Torvalds 6841da177e4SLinus Torvalds /* 6851da177e4SLinus Torvalds * Drop through to notify 6861da177e4SLinus Torvalds */ 6871da177e4SLinus Torvalds 6881da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 6891da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 6901da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 6911da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 6921da177e4SLinus Torvalds break; 6931da177e4SLinus Torvalds 6941da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 6951da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 6961da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 6971da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 6981da177e4SLinus Torvalds case NDISC_REDIRECT: 6991da177e4SLinus Torvalds ndisc_rcv(skb); 7001da177e4SLinus Torvalds break; 7011da177e4SLinus Torvalds 7021da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 7031da177e4SLinus Torvalds igmp6_event_query(skb); 7041da177e4SLinus Torvalds break; 7051da177e4SLinus Torvalds 7061da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 7071da177e4SLinus Torvalds igmp6_event_report(skb); 7081da177e4SLinus Torvalds break; 7091da177e4SLinus Torvalds 7101da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 7111da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 7121da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 7131da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 7141da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 7151da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 7161da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 7171da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 7181da177e4SLinus Torvalds break; 7191da177e4SLinus Torvalds 7201da177e4SLinus Torvalds default: 72164ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n"); 7221da177e4SLinus Torvalds 7231da177e4SLinus Torvalds /* informational */ 7241da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 7251da177e4SLinus Torvalds break; 7261da177e4SLinus Torvalds 7271da177e4SLinus Torvalds /* 7281da177e4SLinus Torvalds * error of unknown type. 7291da177e4SLinus Torvalds * must pass to upper level 7301da177e4SLinus Torvalds */ 7311da177e4SLinus Torvalds 7321da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7331da177e4SLinus Torvalds }; 7341da177e4SLinus Torvalds kfree_skb(skb); 7351da177e4SLinus Torvalds return 0; 7361da177e4SLinus Torvalds 7371da177e4SLinus Torvalds discard_it: 7381da177e4SLinus Torvalds ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS); 7391da177e4SLinus Torvalds kfree_skb(skb); 7401da177e4SLinus Torvalds return 0; 7411da177e4SLinus Torvalds } 7421da177e4SLinus Torvalds 743640c41c7SIngo Molnar /* 744640c41c7SIngo Molnar * Special lock-class for __icmpv6_socket: 745640c41c7SIngo Molnar */ 746640c41c7SIngo Molnar static struct lock_class_key icmpv6_socket_sk_dst_lock_key; 747640c41c7SIngo Molnar 7481da177e4SLinus Torvalds int __init icmpv6_init(struct net_proto_family *ops) 7491da177e4SLinus Torvalds { 7501da177e4SLinus Torvalds struct sock *sk; 7511da177e4SLinus Torvalds int err, i, j; 7521da177e4SLinus Torvalds 7536f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 7541da177e4SLinus Torvalds err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, 7551da177e4SLinus Torvalds &per_cpu(__icmpv6_socket, i)); 7561da177e4SLinus Torvalds if (err < 0) { 7571da177e4SLinus Torvalds printk(KERN_ERR 7581da177e4SLinus Torvalds "Failed to initialize the ICMP6 control socket " 7591da177e4SLinus Torvalds "(err %d).\n", 7601da177e4SLinus Torvalds err); 7611da177e4SLinus Torvalds goto fail; 7621da177e4SLinus Torvalds } 7631da177e4SLinus Torvalds 7641da177e4SLinus Torvalds sk = per_cpu(__icmpv6_socket, i)->sk; 7651da177e4SLinus Torvalds sk->sk_allocation = GFP_ATOMIC; 766640c41c7SIngo Molnar /* 767640c41c7SIngo Molnar * Split off their lock-class, because sk->sk_dst_lock 768640c41c7SIngo Molnar * gets used from softirqs, which is safe for 769640c41c7SIngo Molnar * __icmpv6_socket (because those never get directly used 770640c41c7SIngo Molnar * via userspace syscalls), but unsafe for normal sockets. 771640c41c7SIngo Molnar */ 772640c41c7SIngo Molnar lockdep_set_class(&sk->sk_dst_lock, 773640c41c7SIngo Molnar &icmpv6_socket_sk_dst_lock_key); 7741da177e4SLinus Torvalds 7751da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 7761da177e4SLinus Torvalds * sk_buff struct overhead. 7771da177e4SLinus Torvalds */ 7781da177e4SLinus Torvalds sk->sk_sndbuf = 7791da177e4SLinus Torvalds (2 * ((64 * 1024) + sizeof(struct sk_buff))); 7801da177e4SLinus Torvalds 7811da177e4SLinus Torvalds sk->sk_prot->unhash(sk); 7821da177e4SLinus Torvalds } 7831da177e4SLinus Torvalds 7841da177e4SLinus Torvalds 7851da177e4SLinus Torvalds if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) { 7861da177e4SLinus Torvalds printk(KERN_ERR "Failed to register ICMP6 protocol\n"); 7871da177e4SLinus Torvalds err = -EAGAIN; 7881da177e4SLinus Torvalds goto fail; 7891da177e4SLinus Torvalds } 7901da177e4SLinus Torvalds 7911da177e4SLinus Torvalds return 0; 7921da177e4SLinus Torvalds 7931da177e4SLinus Torvalds fail: 7941da177e4SLinus Torvalds for (j = 0; j < i; j++) { 7951da177e4SLinus Torvalds if (!cpu_possible(j)) 7961da177e4SLinus Torvalds continue; 7971da177e4SLinus Torvalds sock_release(per_cpu(__icmpv6_socket, j)); 7981da177e4SLinus Torvalds } 7991da177e4SLinus Torvalds 8001da177e4SLinus Torvalds return err; 8011da177e4SLinus Torvalds } 8021da177e4SLinus Torvalds 8031da177e4SLinus Torvalds void icmpv6_cleanup(void) 8041da177e4SLinus Torvalds { 8051da177e4SLinus Torvalds int i; 8061da177e4SLinus Torvalds 8076f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8081da177e4SLinus Torvalds sock_release(per_cpu(__icmpv6_socket, i)); 8091da177e4SLinus Torvalds } 8101da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 8111da177e4SLinus Torvalds } 8121da177e4SLinus Torvalds 8139b5b5cffSArjan van de Ven static const struct icmp6_err { 8141da177e4SLinus Torvalds int err; 8151da177e4SLinus Torvalds int fatal; 8161da177e4SLinus Torvalds } tab_unreach[] = { 8171da177e4SLinus Torvalds { /* NOROUTE */ 8181da177e4SLinus Torvalds .err = ENETUNREACH, 8191da177e4SLinus Torvalds .fatal = 0, 8201da177e4SLinus Torvalds }, 8211da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 8221da177e4SLinus Torvalds .err = EACCES, 8231da177e4SLinus Torvalds .fatal = 1, 8241da177e4SLinus Torvalds }, 8251da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 8261da177e4SLinus Torvalds .err = EHOSTUNREACH, 8271da177e4SLinus Torvalds .fatal = 0, 8281da177e4SLinus Torvalds }, 8291da177e4SLinus Torvalds { /* ADDR_UNREACH */ 8301da177e4SLinus Torvalds .err = EHOSTUNREACH, 8311da177e4SLinus Torvalds .fatal = 0, 8321da177e4SLinus Torvalds }, 8331da177e4SLinus Torvalds { /* PORT_UNREACH */ 8341da177e4SLinus Torvalds .err = ECONNREFUSED, 8351da177e4SLinus Torvalds .fatal = 1, 8361da177e4SLinus Torvalds }, 8371da177e4SLinus Torvalds }; 8381da177e4SLinus Torvalds 8391da177e4SLinus Torvalds int icmpv6_err_convert(int type, int code, int *err) 8401da177e4SLinus Torvalds { 8411da177e4SLinus Torvalds int fatal = 0; 8421da177e4SLinus Torvalds 8431da177e4SLinus Torvalds *err = EPROTO; 8441da177e4SLinus Torvalds 8451da177e4SLinus Torvalds switch (type) { 8461da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 8471da177e4SLinus Torvalds fatal = 1; 8481da177e4SLinus Torvalds if (code <= ICMPV6_PORT_UNREACH) { 8491da177e4SLinus Torvalds *err = tab_unreach[code].err; 8501da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 8511da177e4SLinus Torvalds } 8521da177e4SLinus Torvalds break; 8531da177e4SLinus Torvalds 8541da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 8551da177e4SLinus Torvalds *err = EMSGSIZE; 8561da177e4SLinus Torvalds break; 8571da177e4SLinus Torvalds 8581da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 8591da177e4SLinus Torvalds *err = EPROTO; 8601da177e4SLinus Torvalds fatal = 1; 8611da177e4SLinus Torvalds break; 8621da177e4SLinus Torvalds 8631da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 8641da177e4SLinus Torvalds *err = EHOSTUNREACH; 8651da177e4SLinus Torvalds break; 8661da177e4SLinus Torvalds }; 8671da177e4SLinus Torvalds 8681da177e4SLinus Torvalds return fatal; 8691da177e4SLinus Torvalds } 8701da177e4SLinus Torvalds 8711da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 8721da177e4SLinus Torvalds ctl_table ipv6_icmp_table[] = { 8731da177e4SLinus Torvalds { 8741da177e4SLinus Torvalds .ctl_name = NET_IPV6_ICMP_RATELIMIT, 8751da177e4SLinus Torvalds .procname = "ratelimit", 8761da177e4SLinus Torvalds .data = &sysctl_icmpv6_time, 8771da177e4SLinus Torvalds .maxlen = sizeof(int), 8781da177e4SLinus Torvalds .mode = 0644, 8791da177e4SLinus Torvalds .proc_handler = &proc_dointvec 8801da177e4SLinus Torvalds }, 8811da177e4SLinus Torvalds { .ctl_name = 0 }, 8821da177e4SLinus Torvalds }; 8831da177e4SLinus Torvalds #endif 8841da177e4SLinus Torvalds 885