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 * Based on net/ipv4/icmp.c 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * RFC 1885 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 131da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 141da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 151da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 161da177e4SLinus Torvalds */ 171da177e4SLinus Torvalds 181da177e4SLinus Torvalds /* 191da177e4SLinus Torvalds * Changes: 201da177e4SLinus Torvalds * 211da177e4SLinus Torvalds * Andi Kleen : exception handling 221da177e4SLinus Torvalds * Andi Kleen add rate limits. never reply to a icmp. 231da177e4SLinus Torvalds * add more length checks and other fixes. 241da177e4SLinus Torvalds * yoshfuji : ensure to sent parameter problem for 251da177e4SLinus Torvalds * fragments. 261da177e4SLinus Torvalds * YOSHIFUJI Hideaki @USAGI: added sysctl for icmp rate limit. 271da177e4SLinus Torvalds * Randy Dunlap and 281da177e4SLinus Torvalds * YOSHIFUJI Hideaki @USAGI: Per-interface statistics support 291da177e4SLinus Torvalds * Kazunori MIYAZAWA @USAGI: change output process to use ip6_append_data 301da177e4SLinus Torvalds */ 311da177e4SLinus Torvalds 321da177e4SLinus Torvalds #include <linux/module.h> 331da177e4SLinus Torvalds #include <linux/errno.h> 341da177e4SLinus Torvalds #include <linux/types.h> 351da177e4SLinus Torvalds #include <linux/socket.h> 361da177e4SLinus Torvalds #include <linux/in.h> 371da177e4SLinus Torvalds #include <linux/kernel.h> 381da177e4SLinus Torvalds #include <linux/sockios.h> 391da177e4SLinus Torvalds #include <linux/net.h> 401da177e4SLinus Torvalds #include <linux/skbuff.h> 411da177e4SLinus Torvalds #include <linux/init.h> 42763ecff1SYasuyuki Kozakai #include <linux/netfilter.h> 435a0e3ad6STejun Heo #include <linux/slab.h> 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 461da177e4SLinus Torvalds #include <linux/sysctl.h> 471da177e4SLinus Torvalds #endif 481da177e4SLinus Torvalds 491da177e4SLinus Torvalds #include <linux/inet.h> 501da177e4SLinus Torvalds #include <linux/netdevice.h> 511da177e4SLinus Torvalds #include <linux/icmpv6.h> 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds #include <net/ip.h> 541da177e4SLinus Torvalds #include <net/sock.h> 551da177e4SLinus Torvalds 561da177e4SLinus Torvalds #include <net/ipv6.h> 571da177e4SLinus Torvalds #include <net/ip6_checksum.h> 581da177e4SLinus Torvalds #include <net/protocol.h> 591da177e4SLinus Torvalds #include <net/raw.h> 601da177e4SLinus Torvalds #include <net/rawv6.h> 611da177e4SLinus Torvalds #include <net/transp_v6.h> 621da177e4SLinus Torvalds #include <net/ip6_route.h> 631da177e4SLinus Torvalds #include <net/addrconf.h> 641da177e4SLinus Torvalds #include <net/icmp.h> 658b7817f3SHerbert Xu #include <net/xfrm.h> 661ed8516fSDenis V. Lunev #include <net/inet_common.h> 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds #include <asm/uaccess.h> 691da177e4SLinus Torvalds #include <asm/system.h> 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds /* 721da177e4SLinus Torvalds * The ICMP socket(s). This is the most convenient way to flow control 731da177e4SLinus Torvalds * our ICMP output as well as maintain a clean interface throughout 741da177e4SLinus Torvalds * all layers. All Socketless IP sends will soon be gone. 751da177e4SLinus Torvalds * 761da177e4SLinus Torvalds * On SMP we have one ICMP socket per-cpu. 771da177e4SLinus Torvalds */ 7898c6d1b2SDenis V. Lunev static inline struct sock *icmpv6_sk(struct net *net) 7998c6d1b2SDenis V. Lunev { 8098c6d1b2SDenis V. Lunev return net->ipv6.icmp_sk[smp_processor_id()]; 8198c6d1b2SDenis V. Lunev } 821da177e4SLinus Torvalds 83e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb); 841da177e4SLinus Torvalds 8541135cc8SAlexey Dobriyan static const struct inet6_protocol icmpv6_protocol = { 861da177e4SLinus Torvalds .handler = icmpv6_rcv, 878b7817f3SHerbert Xu .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 881da177e4SLinus Torvalds }; 891da177e4SLinus Torvalds 90fdc0bde9SDenis V. Lunev static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) 911da177e4SLinus Torvalds { 92fdc0bde9SDenis V. Lunev struct sock *sk; 93fdc0bde9SDenis V. Lunev 941da177e4SLinus Torvalds local_bh_disable(); 951da177e4SLinus Torvalds 96fdc0bde9SDenis V. Lunev sk = icmpv6_sk(net); 97405666dbSDenis V. Lunev if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { 981da177e4SLinus Torvalds /* This can happen if the output path (f.e. SIT or 991da177e4SLinus Torvalds * ip6ip6 tunnel) signals dst_link_failure() for an 1001da177e4SLinus Torvalds * outgoing ICMP6 packet. 1011da177e4SLinus Torvalds */ 1021da177e4SLinus Torvalds local_bh_enable(); 103fdc0bde9SDenis V. Lunev return NULL; 1041da177e4SLinus Torvalds } 105fdc0bde9SDenis V. Lunev return sk; 1061da177e4SLinus Torvalds } 1071da177e4SLinus Torvalds 108405666dbSDenis V. Lunev static __inline__ void icmpv6_xmit_unlock(struct sock *sk) 1091da177e4SLinus Torvalds { 110405666dbSDenis V. Lunev spin_unlock_bh(&sk->sk_lock.slock); 1111da177e4SLinus Torvalds } 1121da177e4SLinus Torvalds 1131da177e4SLinus Torvalds /* 1141da177e4SLinus Torvalds * Slightly more convenient version of icmpv6_send. 1151da177e4SLinus Torvalds */ 116d5fdd6baSBrian Haley void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) 1171da177e4SLinus Torvalds { 1183ffe533cSAlexey Dobriyan icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos); 1191da177e4SLinus Torvalds kfree_skb(skb); 1201da177e4SLinus Torvalds } 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds /* 1231da177e4SLinus Torvalds * Figure out, may we reply to this packet with icmp error. 1241da177e4SLinus Torvalds * 1251da177e4SLinus Torvalds * We do not reply, if: 1261da177e4SLinus Torvalds * - it was icmp error message. 1271da177e4SLinus Torvalds * - it is truncated, so that it is known, that protocol is ICMPV6 1281da177e4SLinus Torvalds * (i.e. in the middle of some exthdr) 1291da177e4SLinus Torvalds * 1301da177e4SLinus Torvalds * --ANK (980726) 1311da177e4SLinus Torvalds */ 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvalds static int is_ineligible(struct sk_buff *skb) 1341da177e4SLinus Torvalds { 1350660e03fSArnaldo Carvalho de Melo int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; 1361da177e4SLinus Torvalds int len = skb->len - ptr; 1370660e03fSArnaldo Carvalho de Melo __u8 nexthdr = ipv6_hdr(skb)->nexthdr; 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds if (len < 0) 1401da177e4SLinus Torvalds return 1; 1411da177e4SLinus Torvalds 1420d3d077cSHerbert Xu ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr); 1431da177e4SLinus Torvalds if (ptr < 0) 1441da177e4SLinus Torvalds return 0; 1451da177e4SLinus Torvalds if (nexthdr == IPPROTO_ICMPV6) { 1461da177e4SLinus Torvalds u8 _type, *tp; 1471da177e4SLinus Torvalds tp = skb_header_pointer(skb, 1481da177e4SLinus Torvalds ptr+offsetof(struct icmp6hdr, icmp6_type), 1491da177e4SLinus Torvalds sizeof(_type), &_type); 1501da177e4SLinus Torvalds if (tp == NULL || 1511da177e4SLinus Torvalds !(*tp & ICMPV6_INFOMSG_MASK)) 1521da177e4SLinus Torvalds return 1; 1531da177e4SLinus Torvalds } 1541da177e4SLinus Torvalds return 0; 1551da177e4SLinus Torvalds } 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds /* 1581da177e4SLinus Torvalds * Check the ICMP output rate limit 1591da177e4SLinus Torvalds */ 160d5fdd6baSBrian Haley static inline int icmpv6_xrlim_allow(struct sock *sk, u8 type, 1611da177e4SLinus Torvalds struct flowi *fl) 1621da177e4SLinus Torvalds { 1631da177e4SLinus Torvalds struct dst_entry *dst; 1643b1e0a65SYOSHIFUJI Hideaki struct net *net = sock_net(sk); 1651da177e4SLinus Torvalds int res = 0; 1661da177e4SLinus Torvalds 1671da177e4SLinus Torvalds /* Informational messages are not limited. */ 1681da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 1691da177e4SLinus Torvalds return 1; 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds /* Do not limit pmtu discovery, it would break it. */ 1721da177e4SLinus Torvalds if (type == ICMPV6_PKT_TOOBIG) 1731da177e4SLinus Torvalds return 1; 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds /* 1761da177e4SLinus Torvalds * Look up the output route. 1771da177e4SLinus Torvalds * XXX: perhaps the expire for routing entries cloned by 1781da177e4SLinus Torvalds * this lookup should be more aggressive (not longer than timeout). 1791da177e4SLinus Torvalds */ 1809a43b709SBenjamin Thery dst = ip6_route_output(net, sk, fl); 1811da177e4SLinus Torvalds if (dst->error) { 1823bd653c8SDenis V. Lunev IP6_INC_STATS(net, ip6_dst_idev(dst), 183a11d206dSYOSHIFUJI Hideaki IPSTATS_MIB_OUTNOROUTES); 1841da177e4SLinus Torvalds } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { 1851da177e4SLinus Torvalds res = 1; 1861da177e4SLinus Torvalds } else { 1871da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 1889a43b709SBenjamin Thery int tmo = net->ipv6.sysctl.icmpv6_time; 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds /* Give more bandwidth to wider prefixes. */ 1911da177e4SLinus Torvalds if (rt->rt6i_dst.plen < 128) 1921da177e4SLinus Torvalds tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds res = xrlim_allow(dst, tmo); 1951da177e4SLinus Torvalds } 1961da177e4SLinus Torvalds dst_release(dst); 1971da177e4SLinus Torvalds return res; 1981da177e4SLinus Torvalds } 1991da177e4SLinus Torvalds 2001da177e4SLinus Torvalds /* 2011da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2021da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2031da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2041da177e4SLinus Torvalds * highest-order two bits set to 10 2051da177e4SLinus Torvalds */ 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds static __inline__ int opt_unrec(struct sk_buff *skb, __u32 offset) 2081da177e4SLinus Torvalds { 2091da177e4SLinus Torvalds u8 _optval, *op; 2101da177e4SLinus Torvalds 211bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2121da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 2131da177e4SLinus Torvalds if (op == NULL) 2141da177e4SLinus Torvalds return 1; 2151da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2161da177e4SLinus Torvalds } 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds static int icmpv6_push_pending_frames(struct sock *sk, struct flowi *fl, struct icmp6hdr *thdr, int len) 2191da177e4SLinus Torvalds { 2201da177e4SLinus Torvalds struct sk_buff *skb; 2211da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2221da177e4SLinus Torvalds int err = 0; 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvalds if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 2251da177e4SLinus Torvalds goto out; 2261da177e4SLinus Torvalds 227cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2281da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2291da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2301da177e4SLinus Torvalds 2311da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 23207f0757aSJoe Perches skb->csum = csum_partial(icmp6h, 2331da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2341da177e4SLinus Torvalds icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src, 2351da177e4SLinus Torvalds &fl->fl6_dst, 2361da177e4SLinus Torvalds len, fl->proto, 2371da177e4SLinus Torvalds skb->csum); 2381da177e4SLinus Torvalds } else { 239868c86bcSAl Viro __wsum tmp_csum = 0; 2401da177e4SLinus Torvalds 2411da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2421da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2431da177e4SLinus Torvalds } 2441da177e4SLinus Torvalds 24507f0757aSJoe Perches tmp_csum = csum_partial(icmp6h, 2461da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 247868c86bcSAl Viro icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src, 2481da177e4SLinus Torvalds &fl->fl6_dst, 249868c86bcSAl Viro len, fl->proto, 250868c86bcSAl Viro tmp_csum); 2511da177e4SLinus Torvalds } 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; 2675f92a738SAl Viro __wsum 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 27759fbb3a6SMasahide NAKAMURA #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 27879383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 27979383236SMasahide NAKAMURA { 2800660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 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)) { 289d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 290d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 29179383236SMasahide NAKAMURA ipv6_addr_copy(&tmp, &iph->saddr); 29279383236SMasahide NAKAMURA ipv6_addr_copy(&iph->saddr, &hao->addr); 29379383236SMasahide NAKAMURA ipv6_addr_copy(&hao->addr, &tmp); 29479383236SMasahide NAKAMURA } 29579383236SMasahide NAKAMURA } 29679383236SMasahide NAKAMURA } 29779383236SMasahide NAKAMURA #else 29879383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 29979383236SMasahide NAKAMURA #endif 30079383236SMasahide NAKAMURA 3011da177e4SLinus Torvalds /* 3021da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 3031da177e4SLinus Torvalds */ 3043ffe533cSAlexey Dobriyan void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info) 3051da177e4SLinus Torvalds { 306c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 3071da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 3080660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 30984427d53SYOSHIFUJI Hideaki struct sock *sk; 31084427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 3111da177e4SLinus Torvalds struct in6_addr *saddr = NULL; 3121da177e4SLinus Torvalds struct dst_entry *dst; 3138b7817f3SHerbert Xu struct dst_entry *dst2; 3141da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 3151da177e4SLinus Torvalds struct flowi fl; 3168b7817f3SHerbert Xu struct flowi fl2; 3171da177e4SLinus Torvalds struct icmpv6_msg msg; 3181da177e4SLinus Torvalds int iif = 0; 3191da177e4SLinus Torvalds int addr_type = 0; 3201da177e4SLinus Torvalds int len; 321e651f03aSGerrit Renker int hlimit; 3221da177e4SLinus Torvalds int err = 0; 3231da177e4SLinus Torvalds 32427a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 32527a884dcSArnaldo Carvalho de Melo (skb->network_header + sizeof(*hdr)) > skb->tail) 3261da177e4SLinus Torvalds return; 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds /* 3291da177e4SLinus Torvalds * Make sure we respect the rules 3301da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 3311da177e4SLinus Torvalds * Rule (e.1) is enforced by not using icmpv6_send 3321da177e4SLinus Torvalds * in any code that processes icmp errors. 3331da177e4SLinus Torvalds */ 3341da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 3351da177e4SLinus Torvalds 3369a43b709SBenjamin Thery if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0)) 3371da177e4SLinus Torvalds saddr = &hdr->daddr; 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds /* 3401da177e4SLinus Torvalds * Dest addr check 3411da177e4SLinus Torvalds */ 3421da177e4SLinus Torvalds 3431da177e4SLinus Torvalds if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) { 3441da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 3451da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 3461da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 3471da177e4SLinus Torvalds (opt_unrec(skb, info)))) 3481da177e4SLinus Torvalds return; 3491da177e4SLinus Torvalds 3501da177e4SLinus Torvalds saddr = NULL; 3511da177e4SLinus Torvalds } 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds /* 3561da177e4SLinus Torvalds * Source addr check 3571da177e4SLinus Torvalds */ 3581da177e4SLinus Torvalds 3591da177e4SLinus Torvalds if (addr_type & IPV6_ADDR_LINKLOCAL) 3601da177e4SLinus Torvalds iif = skb->dev->ifindex; 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds /* 3638de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 3648de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 3658de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 3668de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 3671da177e4SLinus Torvalds */ 3681da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 36964ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n"); 3701da177e4SLinus Torvalds return; 3711da177e4SLinus Torvalds } 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvalds /* 3741da177e4SLinus Torvalds * Never answer to a ICMP packet. 3751da177e4SLinus Torvalds */ 3761da177e4SLinus Torvalds if (is_ineligible(skb)) { 37764ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n"); 3781da177e4SLinus Torvalds return; 3791da177e4SLinus Torvalds } 3801da177e4SLinus Torvalds 38179383236SMasahide NAKAMURA mip6_addr_swap(skb); 38279383236SMasahide NAKAMURA 3831da177e4SLinus Torvalds memset(&fl, 0, sizeof(fl)); 3841da177e4SLinus Torvalds fl.proto = IPPROTO_ICMPV6; 3851da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_dst, &hdr->saddr); 3861da177e4SLinus Torvalds if (saddr) 3871da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_src, saddr); 3881da177e4SLinus Torvalds fl.oif = iif; 3891da177e4SLinus Torvalds fl.fl_icmp_type = type; 3901da177e4SLinus Torvalds fl.fl_icmp_code = code; 391beb8d13bSVenkat Yekkirala security_skb_classify_flow(skb, &fl); 3921da177e4SLinus Torvalds 393fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 394fdc0bde9SDenis V. Lunev if (sk == NULL) 395405666dbSDenis V. Lunev return; 396fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 397405666dbSDenis V. Lunev 3981da177e4SLinus Torvalds if (!icmpv6_xrlim_allow(sk, type, &fl)) 3991da177e4SLinus Torvalds goto out; 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 4021da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 4031da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 4041da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 4071da177e4SLinus Torvalds fl.oif = np->mcast_oif; 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds err = ip6_dst_lookup(sk, &dst, &fl); 4101da177e4SLinus Torvalds if (err) 4111da177e4SLinus Torvalds goto out; 4128de3351eSYOSHIFUJI Hideaki 4138de3351eSYOSHIFUJI Hideaki /* 4148de3351eSYOSHIFUJI Hideaki * We won't send icmp if the destination is known 4158de3351eSYOSHIFUJI Hideaki * anycast. 4168de3351eSYOSHIFUJI Hideaki */ 4178de3351eSYOSHIFUJI Hideaki if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { 4188de3351eSYOSHIFUJI Hideaki LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n"); 4198de3351eSYOSHIFUJI Hideaki goto out_dst_release; 4208de3351eSYOSHIFUJI Hideaki } 4218de3351eSYOSHIFUJI Hideaki 4228b7817f3SHerbert Xu /* No need to clone since we're just using its address. */ 4238b7817f3SHerbert Xu dst2 = dst; 4248b7817f3SHerbert Xu 42552479b62SAlexey Dobriyan err = xfrm_lookup(net, &dst, &fl, sk, 0); 4268b7817f3SHerbert Xu switch (err) { 4278b7817f3SHerbert Xu case 0: 4288b7817f3SHerbert Xu if (dst != dst2) 4298b7817f3SHerbert Xu goto route_done; 4308b7817f3SHerbert Xu break; 4318b7817f3SHerbert Xu case -EPERM: 4328b7817f3SHerbert Xu dst = NULL; 4338b7817f3SHerbert Xu break; 4348b7817f3SHerbert Xu default: 4358b7817f3SHerbert Xu goto out; 4368b7817f3SHerbert Xu } 4378b7817f3SHerbert Xu 4388b7817f3SHerbert Xu if (xfrm_decode_session_reverse(skb, &fl2, AF_INET6)) 439af268182SHerbert Xu goto relookup_failed; 4401da177e4SLinus Torvalds 4416c06a478SJiri Pirko if (ip6_dst_lookup(sk, &dst2, &fl2)) 442af268182SHerbert Xu goto relookup_failed; 4438b7817f3SHerbert Xu 4446c06a478SJiri Pirko err = xfrm_lookup(net, &dst2, &fl2, sk, XFRM_LOOKUP_ICMP); 445af268182SHerbert Xu switch (err) { 446af268182SHerbert Xu case 0: 4478b7817f3SHerbert Xu dst_release(dst); 4488b7817f3SHerbert Xu dst = dst2; 449af268182SHerbert Xu break; 450af268182SHerbert Xu case -EPERM: 451af268182SHerbert Xu goto out_dst_release; 452af268182SHerbert Xu default: 453af268182SHerbert Xu relookup_failed: 454af268182SHerbert Xu if (!dst) 4558b7817f3SHerbert Xu goto out; 456af268182SHerbert Xu break; 457af268182SHerbert Xu } 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) 4656b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 4661da177e4SLinus Torvalds 4671da177e4SLinus Torvalds msg.skb = skb; 468bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 469763ecff1SYasuyuki Kozakai msg.type = type; 4701da177e4SLinus Torvalds 4711da177e4SLinus Torvalds len = skb->len - msg.offset; 4721da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); 4731da177e4SLinus Torvalds if (len < 0) { 47464ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n"); 4751da177e4SLinus Torvalds goto out_dst_release; 4761da177e4SLinus Torvalds } 4771da177e4SLinus Torvalds 4781da177e4SLinus Torvalds idev = in6_dev_get(skb->dev); 4791da177e4SLinus Torvalds 4801da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, 4811da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 482e651f03aSGerrit Renker sizeof(struct icmp6hdr), hlimit, 483e651f03aSGerrit Renker np->tclass, NULL, &fl, (struct rt6_info*)dst, 48413b52cd4SBrian Haley MSG_DONTWAIT, np->dontfrag); 4851da177e4SLinus Torvalds if (err) { 4861f8438a8SEric Dumazet ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS); 4871da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 4881da177e4SLinus Torvalds goto out_put; 4891da177e4SLinus Torvalds } 4901da177e4SLinus Torvalds err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, len + sizeof(struct icmp6hdr)); 4911da177e4SLinus Torvalds 4921da177e4SLinus Torvalds out_put: 4931da177e4SLinus Torvalds if (likely(idev != NULL)) 4941da177e4SLinus Torvalds in6_dev_put(idev); 4951da177e4SLinus Torvalds out_dst_release: 4961da177e4SLinus Torvalds dst_release(dst); 4971da177e4SLinus Torvalds out: 498405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 4991da177e4SLinus Torvalds } 5001da177e4SLinus Torvalds 5017159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_send); 5027159039aSYOSHIFUJI Hideaki 5031da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 5041da177e4SLinus Torvalds { 505c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 50684427d53SYOSHIFUJI Hideaki struct sock *sk; 5071da177e4SLinus Torvalds struct inet6_dev *idev; 50884427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 5091da177e4SLinus Torvalds struct in6_addr *saddr = NULL; 510cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 5111da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 5121da177e4SLinus Torvalds struct flowi fl; 5131da177e4SLinus Torvalds struct icmpv6_msg msg; 5141da177e4SLinus Torvalds struct dst_entry *dst; 5151da177e4SLinus Torvalds int err = 0; 5161da177e4SLinus Torvalds int hlimit; 5171da177e4SLinus Torvalds 5180660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 5191da177e4SLinus Torvalds 5201da177e4SLinus Torvalds if (!ipv6_unicast_destination(skb)) 5211da177e4SLinus Torvalds saddr = NULL; 5221da177e4SLinus Torvalds 5231da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 5241da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 5251da177e4SLinus Torvalds 5261da177e4SLinus Torvalds memset(&fl, 0, sizeof(fl)); 5271da177e4SLinus Torvalds fl.proto = IPPROTO_ICMPV6; 5280660e03fSArnaldo Carvalho de Melo ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); 5291da177e4SLinus Torvalds if (saddr) 5301da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_src, saddr); 5311da177e4SLinus Torvalds fl.oif = skb->dev->ifindex; 5321da177e4SLinus Torvalds fl.fl_icmp_type = ICMPV6_ECHO_REPLY; 533beb8d13bSVenkat Yekkirala security_skb_classify_flow(skb, &fl); 5341da177e4SLinus Torvalds 535fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 536fdc0bde9SDenis V. Lunev if (sk == NULL) 537405666dbSDenis V. Lunev return; 538fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 539405666dbSDenis V. Lunev 5401da177e4SLinus Torvalds if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 5411da177e4SLinus Torvalds fl.oif = np->mcast_oif; 5421da177e4SLinus Torvalds 5431da177e4SLinus Torvalds err = ip6_dst_lookup(sk, &dst, &fl); 5441da177e4SLinus Torvalds if (err) 5451da177e4SLinus Torvalds goto out; 54652479b62SAlexey Dobriyan if ((err = xfrm_lookup(net, &dst, &fl, sk, 0)) < 0) 547e104411bSPatrick McHardy goto out; 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds if (ipv6_addr_is_multicast(&fl.fl6_dst)) 5501da177e4SLinus Torvalds hlimit = np->mcast_hops; 5511da177e4SLinus Torvalds else 5521da177e4SLinus Torvalds hlimit = np->hop_limit; 5531da177e4SLinus Torvalds if (hlimit < 0) 5546b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 5551da177e4SLinus Torvalds 5561da177e4SLinus Torvalds idev = in6_dev_get(skb->dev); 5571da177e4SLinus Torvalds 5581da177e4SLinus Torvalds msg.skb = skb; 5591da177e4SLinus Torvalds msg.offset = 0; 560763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 5611da177e4SLinus Torvalds 5621da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 563e651f03aSGerrit Renker sizeof(struct icmp6hdr), hlimit, np->tclass, NULL, &fl, 56413b52cd4SBrian Haley (struct rt6_info*)dst, MSG_DONTWAIT, 56513b52cd4SBrian Haley np->dontfrag); 5661da177e4SLinus Torvalds 5671da177e4SLinus Torvalds if (err) { 5681f8438a8SEric Dumazet ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS); 5691da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 5701da177e4SLinus Torvalds goto out_put; 5711da177e4SLinus Torvalds } 5721da177e4SLinus Torvalds err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, skb->len + sizeof(struct icmp6hdr)); 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds out_put: 5751da177e4SLinus Torvalds if (likely(idev != NULL)) 5761da177e4SLinus Torvalds in6_dev_put(idev); 5771da177e4SLinus Torvalds dst_release(dst); 5781da177e4SLinus Torvalds out: 579405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5801da177e4SLinus Torvalds } 5811da177e4SLinus Torvalds 582d5fdd6baSBrian Haley static void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 5831da177e4SLinus Torvalds { 58441135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 5851da177e4SLinus Torvalds int inner_offset; 5861da177e4SLinus Torvalds int hash; 5871da177e4SLinus Torvalds u8 nexthdr; 5881da177e4SLinus Torvalds 5891da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 5901da177e4SLinus Torvalds return; 5911da177e4SLinus Torvalds 5921da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 5931da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 5941da177e4SLinus Torvalds /* now skip over extension headers */ 5950d3d077cSHerbert Xu inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr); 5961da177e4SLinus Torvalds if (inner_offset<0) 5971da177e4SLinus Torvalds return; 5981da177e4SLinus Torvalds } else { 5991da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 6001da177e4SLinus Torvalds } 6011da177e4SLinus Torvalds 6021da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 6031da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 6041da177e4SLinus Torvalds return; 6051da177e4SLinus Torvalds 6061da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 6071da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 6081da177e4SLinus Torvalds pmtu discovery. 6091da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 6101da177e4SLinus Torvalds --ANK (980726) 6111da177e4SLinus Torvalds */ 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds hash = nexthdr & (MAX_INET_PROTOS - 1); 6141da177e4SLinus Torvalds 6151da177e4SLinus Torvalds rcu_read_lock(); 6161da177e4SLinus Torvalds ipprot = rcu_dereference(inet6_protos[hash]); 6171da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 6181da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 6191da177e4SLinus Torvalds rcu_read_unlock(); 6201da177e4SLinus Torvalds 62169d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 6221da177e4SLinus Torvalds } 6231da177e4SLinus Torvalds 6241da177e4SLinus Torvalds /* 6251da177e4SLinus Torvalds * Handle icmp messages 6261da177e4SLinus Torvalds */ 6271da177e4SLinus Torvalds 628e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 6291da177e4SLinus Torvalds { 6301da177e4SLinus Torvalds struct net_device *dev = skb->dev; 6311da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 6321da177e4SLinus Torvalds struct in6_addr *saddr, *daddr; 6331da177e4SLinus Torvalds struct ipv6hdr *orig_hdr; 6341da177e4SLinus Torvalds struct icmp6hdr *hdr; 635d5fdd6baSBrian Haley u8 type; 6361da177e4SLinus Torvalds 637aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 638def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 6398b7817f3SHerbert Xu int nh; 6408b7817f3SHerbert Xu 641def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 642aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 643aebcf82cSHerbert Xu goto drop_no_count; 644aebcf82cSHerbert Xu 6458b7817f3SHerbert Xu if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(*orig_hdr))) 6468b7817f3SHerbert Xu goto drop_no_count; 6478b7817f3SHerbert Xu 6488b7817f3SHerbert Xu nh = skb_network_offset(skb); 6498b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 6508b7817f3SHerbert Xu 6518b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 6528b7817f3SHerbert Xu goto drop_no_count; 6538b7817f3SHerbert Xu 6548b7817f3SHerbert Xu skb_set_network_header(skb, nh); 6558b7817f3SHerbert Xu } 6568b7817f3SHerbert Xu 657e41b5368SDenis V. Lunev ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INMSGS); 6581da177e4SLinus Torvalds 6590660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 6600660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds /* Perform checksum. */ 663fb286bb2SHerbert Xu switch (skb->ip_summed) { 66484fa7933SPatrick McHardy case CHECKSUM_COMPLETE: 665fb286bb2SHerbert Xu if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, 666fb286bb2SHerbert Xu skb->csum)) 667fb286bb2SHerbert Xu break; 668fb286bb2SHerbert Xu /* fall through */ 669fb286bb2SHerbert Xu case CHECKSUM_NONE: 670868c86bcSAl Viro skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len, 671868c86bcSAl Viro IPPROTO_ICMPV6, 0)); 672fb286bb2SHerbert Xu if (__skb_checksum_complete(skb)) { 6735b095d98SHarvey Harrison LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [%pI6 > %pI6]\n", 6740c6ce78aSHarvey Harrison saddr, daddr); 6751da177e4SLinus Torvalds goto discard_it; 6761da177e4SLinus Torvalds } 6771da177e4SLinus Torvalds } 6781da177e4SLinus Torvalds 6798cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 6808cf22943SHerbert Xu goto discard_it; 6811da177e4SLinus Torvalds 682cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 6831da177e4SLinus Torvalds 6841da177e4SLinus Torvalds type = hdr->icmp6_type; 6851da177e4SLinus Torvalds 68655d43808SDenis V. Lunev ICMP6MSGIN_INC_STATS_BH(dev_net(dev), idev, type); 6871da177e4SLinus Torvalds 6881da177e4SLinus Torvalds switch (type) { 6891da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 6901da177e4SLinus Torvalds icmpv6_echo_reply(skb); 6911da177e4SLinus Torvalds break; 6921da177e4SLinus Torvalds 6931da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 6941da177e4SLinus Torvalds /* we couldn't care less */ 6951da177e4SLinus Torvalds break; 6961da177e4SLinus Torvalds 6971da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 6981da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 6991da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 7001da177e4SLinus Torvalds destination cache will allow to solve this problem 7011da177e4SLinus Torvalds --ANK (980726) 7021da177e4SLinus Torvalds */ 7031da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 7041da177e4SLinus Torvalds goto discard_it; 705cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 7061da177e4SLinus Torvalds orig_hdr = (struct ipv6hdr *) (hdr + 1); 7071da177e4SLinus Torvalds rt6_pmtu_discovery(&orig_hdr->daddr, &orig_hdr->saddr, dev, 7081da177e4SLinus Torvalds ntohl(hdr->icmp6_mtu)); 7091da177e4SLinus Torvalds 7101da177e4SLinus Torvalds /* 7111da177e4SLinus Torvalds * Drop through to notify 7121da177e4SLinus Torvalds */ 7131da177e4SLinus Torvalds 7141da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 7151da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 7161da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 7171da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7181da177e4SLinus Torvalds break; 7191da177e4SLinus Torvalds 7201da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 7211da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 7221da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 7231da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 7241da177e4SLinus Torvalds case NDISC_REDIRECT: 7251da177e4SLinus Torvalds ndisc_rcv(skb); 7261da177e4SLinus Torvalds break; 7271da177e4SLinus Torvalds 7281da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 7291da177e4SLinus Torvalds igmp6_event_query(skb); 7301da177e4SLinus Torvalds break; 7311da177e4SLinus Torvalds 7321da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 7331da177e4SLinus Torvalds igmp6_event_report(skb); 7341da177e4SLinus Torvalds break; 7351da177e4SLinus Torvalds 7361da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 7371da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 7381da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 7391da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 7401da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 7411da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 7421da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 7431da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 7441da177e4SLinus Torvalds break; 7451da177e4SLinus Torvalds 7461da177e4SLinus Torvalds default: 74764ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n"); 7481da177e4SLinus Torvalds 7491da177e4SLinus Torvalds /* informational */ 7501da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 7511da177e4SLinus Torvalds break; 7521da177e4SLinus Torvalds 7531da177e4SLinus Torvalds /* 7541da177e4SLinus Torvalds * error of unknown type. 7551da177e4SLinus Torvalds * must pass to upper level 7561da177e4SLinus Torvalds */ 7571da177e4SLinus Torvalds 7581da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7593ff50b79SStephen Hemminger } 7603ff50b79SStephen Hemminger 7611da177e4SLinus Torvalds kfree_skb(skb); 7621da177e4SLinus Torvalds return 0; 7631da177e4SLinus Torvalds 7641da177e4SLinus Torvalds discard_it: 765e41b5368SDenis V. Lunev ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INERRORS); 7668b7817f3SHerbert Xu drop_no_count: 7671da177e4SLinus Torvalds kfree_skb(skb); 7681da177e4SLinus Torvalds return 0; 7691da177e4SLinus Torvalds } 7701da177e4SLinus Torvalds 77195e41e93SYOSHIFUJI Hideaki void icmpv6_flow_init(struct sock *sk, struct flowi *fl, 77295e41e93SYOSHIFUJI Hideaki u8 type, 77395e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 77495e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 77595e41e93SYOSHIFUJI Hideaki int oif) 77695e41e93SYOSHIFUJI Hideaki { 77795e41e93SYOSHIFUJI Hideaki memset(fl, 0, sizeof(*fl)); 77895e41e93SYOSHIFUJI Hideaki ipv6_addr_copy(&fl->fl6_src, saddr); 77995e41e93SYOSHIFUJI Hideaki ipv6_addr_copy(&fl->fl6_dst, daddr); 78095e41e93SYOSHIFUJI Hideaki fl->proto = IPPROTO_ICMPV6; 78195e41e93SYOSHIFUJI Hideaki fl->fl_icmp_type = type; 78295e41e93SYOSHIFUJI Hideaki fl->fl_icmp_code = 0; 78395e41e93SYOSHIFUJI Hideaki fl->oif = oif; 78495e41e93SYOSHIFUJI Hideaki security_sk_classify_flow(sk, fl); 78595e41e93SYOSHIFUJI Hideaki } 78695e41e93SYOSHIFUJI Hideaki 787640c41c7SIngo Molnar /* 788b7e729c4SDenis V. Lunev * Special lock-class for __icmpv6_sk: 789640c41c7SIngo Molnar */ 790640c41c7SIngo Molnar static struct lock_class_key icmpv6_socket_sk_dst_lock_key; 791640c41c7SIngo Molnar 79298c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 7931da177e4SLinus Torvalds { 7941da177e4SLinus Torvalds struct sock *sk; 7951da177e4SLinus Torvalds int err, i, j; 7961da177e4SLinus Torvalds 79798c6d1b2SDenis V. Lunev net->ipv6.icmp_sk = 79898c6d1b2SDenis V. Lunev kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); 79998c6d1b2SDenis V. Lunev if (net->ipv6.icmp_sk == NULL) 80079c91159SDenis V. Lunev return -ENOMEM; 80179c91159SDenis V. Lunev 8026f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8031ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 8041ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 8051da177e4SLinus Torvalds if (err < 0) { 8061da177e4SLinus Torvalds printk(KERN_ERR 8071da177e4SLinus Torvalds "Failed to initialize the ICMP6 control socket " 8081da177e4SLinus Torvalds "(err %d).\n", 8091da177e4SLinus Torvalds err); 8101da177e4SLinus Torvalds goto fail; 8111da177e4SLinus Torvalds } 8121da177e4SLinus Torvalds 8131ed8516fSDenis V. Lunev net->ipv6.icmp_sk[i] = sk; 8145c8cafd6SDenis V. Lunev 815640c41c7SIngo Molnar /* 816640c41c7SIngo Molnar * Split off their lock-class, because sk->sk_dst_lock 817640c41c7SIngo Molnar * gets used from softirqs, which is safe for 818b7e729c4SDenis V. Lunev * __icmpv6_sk (because those never get directly used 819640c41c7SIngo Molnar * via userspace syscalls), but unsafe for normal sockets. 820640c41c7SIngo Molnar */ 821640c41c7SIngo Molnar lockdep_set_class(&sk->sk_dst_lock, 822640c41c7SIngo Molnar &icmpv6_socket_sk_dst_lock_key); 8231da177e4SLinus Torvalds 8241da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 8251da177e4SLinus Torvalds * sk_buff struct overhead. 8261da177e4SLinus Torvalds */ 8271da177e4SLinus Torvalds sk->sk_sndbuf = 8281da177e4SLinus Torvalds (2 * ((64 * 1024) + sizeof(struct sk_buff))); 8291da177e4SLinus Torvalds } 8301da177e4SLinus Torvalds return 0; 8311da177e4SLinus Torvalds 8321da177e4SLinus Torvalds fail: 8335c8cafd6SDenis V. Lunev for (j = 0; j < i; j++) 8341ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); 83598c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 8361da177e4SLinus Torvalds return err; 8371da177e4SLinus Torvalds } 8381da177e4SLinus Torvalds 83998c6d1b2SDenis V. Lunev static void __net_exit icmpv6_sk_exit(struct net *net) 8401da177e4SLinus Torvalds { 8411da177e4SLinus Torvalds int i; 8421da177e4SLinus Torvalds 8436f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8441ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); 8451da177e4SLinus Torvalds } 84698c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 84798c6d1b2SDenis V. Lunev } 84898c6d1b2SDenis V. Lunev 8498ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 85098c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 85198c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 85298c6d1b2SDenis V. Lunev }; 85398c6d1b2SDenis V. Lunev 85498c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 85598c6d1b2SDenis V. Lunev { 85698c6d1b2SDenis V. Lunev int err; 85798c6d1b2SDenis V. Lunev 85898c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 85998c6d1b2SDenis V. Lunev if (err < 0) 86098c6d1b2SDenis V. Lunev return err; 86198c6d1b2SDenis V. Lunev 86298c6d1b2SDenis V. Lunev err = -EAGAIN; 86398c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 86498c6d1b2SDenis V. Lunev goto fail; 86598c6d1b2SDenis V. Lunev return 0; 86698c6d1b2SDenis V. Lunev 86798c6d1b2SDenis V. Lunev fail: 86898c6d1b2SDenis V. Lunev printk(KERN_ERR "Failed to register ICMP6 protocol\n"); 86998c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 87098c6d1b2SDenis V. Lunev return err; 87198c6d1b2SDenis V. Lunev } 87298c6d1b2SDenis V. Lunev 8738ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 87498c6d1b2SDenis V. Lunev { 87598c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 8761da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 8771da177e4SLinus Torvalds } 8781da177e4SLinus Torvalds 87998c6d1b2SDenis V. Lunev 8809b5b5cffSArjan van de Ven static const struct icmp6_err { 8811da177e4SLinus Torvalds int err; 8821da177e4SLinus Torvalds int fatal; 8831da177e4SLinus Torvalds } tab_unreach[] = { 8841da177e4SLinus Torvalds { /* NOROUTE */ 8851da177e4SLinus Torvalds .err = ENETUNREACH, 8861da177e4SLinus Torvalds .fatal = 0, 8871da177e4SLinus Torvalds }, 8881da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 8891da177e4SLinus Torvalds .err = EACCES, 8901da177e4SLinus Torvalds .fatal = 1, 8911da177e4SLinus Torvalds }, 8921da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 8931da177e4SLinus Torvalds .err = EHOSTUNREACH, 8941da177e4SLinus Torvalds .fatal = 0, 8951da177e4SLinus Torvalds }, 8961da177e4SLinus Torvalds { /* ADDR_UNREACH */ 8971da177e4SLinus Torvalds .err = EHOSTUNREACH, 8981da177e4SLinus Torvalds .fatal = 0, 8991da177e4SLinus Torvalds }, 9001da177e4SLinus Torvalds { /* PORT_UNREACH */ 9011da177e4SLinus Torvalds .err = ECONNREFUSED, 9021da177e4SLinus Torvalds .fatal = 1, 9031da177e4SLinus Torvalds }, 9041da177e4SLinus Torvalds }; 9051da177e4SLinus Torvalds 906d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 9071da177e4SLinus Torvalds { 9081da177e4SLinus Torvalds int fatal = 0; 9091da177e4SLinus Torvalds 9101da177e4SLinus Torvalds *err = EPROTO; 9111da177e4SLinus Torvalds 9121da177e4SLinus Torvalds switch (type) { 9131da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 9141da177e4SLinus Torvalds fatal = 1; 9151da177e4SLinus Torvalds if (code <= ICMPV6_PORT_UNREACH) { 9161da177e4SLinus Torvalds *err = tab_unreach[code].err; 9171da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 9181da177e4SLinus Torvalds } 9191da177e4SLinus Torvalds break; 9201da177e4SLinus Torvalds 9211da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 9221da177e4SLinus Torvalds *err = EMSGSIZE; 9231da177e4SLinus Torvalds break; 9241da177e4SLinus Torvalds 9251da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 9261da177e4SLinus Torvalds *err = EPROTO; 9271da177e4SLinus Torvalds fatal = 1; 9281da177e4SLinus Torvalds break; 9291da177e4SLinus Torvalds 9301da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 9311da177e4SLinus Torvalds *err = EHOSTUNREACH; 9321da177e4SLinus Torvalds break; 9333ff50b79SStephen Hemminger } 9341da177e4SLinus Torvalds 9351da177e4SLinus Torvalds return fatal; 9361da177e4SLinus Torvalds } 9371da177e4SLinus Torvalds 9387159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 9397159039aSYOSHIFUJI Hideaki 9401da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 941760f2d01SDaniel Lezcano ctl_table ipv6_icmp_table_template[] = { 9421da177e4SLinus Torvalds { 9431da177e4SLinus Torvalds .procname = "ratelimit", 94441a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 9451da177e4SLinus Torvalds .maxlen = sizeof(int), 9461da177e4SLinus Torvalds .mode = 0644, 9476d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 9481da177e4SLinus Torvalds }, 949f8572d8fSEric W. Biederman { }, 9501da177e4SLinus Torvalds }; 951760f2d01SDaniel Lezcano 9522c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 953760f2d01SDaniel Lezcano { 954760f2d01SDaniel Lezcano struct ctl_table *table; 955760f2d01SDaniel Lezcano 956760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 957760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 958760f2d01SDaniel Lezcano GFP_KERNEL); 9595ee09105SYOSHIFUJI Hideaki 9605ee09105SYOSHIFUJI Hideaki if (table) 9615ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 9625ee09105SYOSHIFUJI Hideaki 963760f2d01SDaniel Lezcano return table; 964760f2d01SDaniel Lezcano } 9651da177e4SLinus Torvalds #endif 9661da177e4SLinus Torvalds 967