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> 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 451da177e4SLinus Torvalds #include <linux/sysctl.h> 461da177e4SLinus Torvalds #endif 471da177e4SLinus Torvalds 481da177e4SLinus Torvalds #include <linux/inet.h> 491da177e4SLinus Torvalds #include <linux/netdevice.h> 501da177e4SLinus Torvalds #include <linux/icmpv6.h> 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds #include <net/ip.h> 531da177e4SLinus Torvalds #include <net/sock.h> 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds #include <net/ipv6.h> 561da177e4SLinus Torvalds #include <net/ip6_checksum.h> 571da177e4SLinus Torvalds #include <net/protocol.h> 581da177e4SLinus Torvalds #include <net/raw.h> 591da177e4SLinus Torvalds #include <net/rawv6.h> 601da177e4SLinus Torvalds #include <net/transp_v6.h> 611da177e4SLinus Torvalds #include <net/ip6_route.h> 621da177e4SLinus Torvalds #include <net/addrconf.h> 631da177e4SLinus Torvalds #include <net/icmp.h> 648b7817f3SHerbert Xu #include <net/xfrm.h> 651ed8516fSDenis V. Lunev #include <net/inet_common.h> 661da177e4SLinus Torvalds 671da177e4SLinus Torvalds #include <asm/uaccess.h> 681da177e4SLinus Torvalds #include <asm/system.h> 691da177e4SLinus Torvalds 70ba89966cSEric Dumazet DEFINE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics) __read_mostly; 717159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_statistics); 7214878f75SDavid L Stevens DEFINE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics) __read_mostly; 7314878f75SDavid L Stevens EXPORT_SYMBOL(icmpv6msg_statistics); 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds /* 761da177e4SLinus Torvalds * The ICMP socket(s). This is the most convenient way to flow control 771da177e4SLinus Torvalds * our ICMP output as well as maintain a clean interface throughout 781da177e4SLinus Torvalds * all layers. All Socketless IP sends will soon be gone. 791da177e4SLinus Torvalds * 801da177e4SLinus Torvalds * On SMP we have one ICMP socket per-cpu. 811da177e4SLinus Torvalds */ 8298c6d1b2SDenis V. Lunev static inline struct sock *icmpv6_sk(struct net *net) 8398c6d1b2SDenis V. Lunev { 8498c6d1b2SDenis V. Lunev return net->ipv6.icmp_sk[smp_processor_id()]; 8598c6d1b2SDenis V. Lunev } 861da177e4SLinus Torvalds 87e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb); 881da177e4SLinus Torvalds 8941135cc8SAlexey Dobriyan static const struct inet6_protocol icmpv6_protocol = { 901da177e4SLinus Torvalds .handler = icmpv6_rcv, 918b7817f3SHerbert Xu .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 921da177e4SLinus Torvalds }; 931da177e4SLinus Torvalds 94fdc0bde9SDenis V. Lunev static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) 951da177e4SLinus Torvalds { 96fdc0bde9SDenis V. Lunev struct sock *sk; 97fdc0bde9SDenis V. Lunev 981da177e4SLinus Torvalds local_bh_disable(); 991da177e4SLinus Torvalds 100fdc0bde9SDenis V. Lunev sk = icmpv6_sk(net); 101405666dbSDenis V. Lunev if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { 1021da177e4SLinus Torvalds /* This can happen if the output path (f.e. SIT or 1031da177e4SLinus Torvalds * ip6ip6 tunnel) signals dst_link_failure() for an 1041da177e4SLinus Torvalds * outgoing ICMP6 packet. 1051da177e4SLinus Torvalds */ 1061da177e4SLinus Torvalds local_bh_enable(); 107fdc0bde9SDenis V. Lunev return NULL; 1081da177e4SLinus Torvalds } 109fdc0bde9SDenis V. Lunev return sk; 1101da177e4SLinus Torvalds } 1111da177e4SLinus Torvalds 112405666dbSDenis V. Lunev static __inline__ void icmpv6_xmit_unlock(struct sock *sk) 1131da177e4SLinus Torvalds { 114405666dbSDenis V. Lunev spin_unlock_bh(&sk->sk_lock.slock); 1151da177e4SLinus Torvalds } 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds /* 1181da177e4SLinus Torvalds * Slightly more convenient version of icmpv6_send. 1191da177e4SLinus Torvalds */ 120d5fdd6baSBrian Haley void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) 1211da177e4SLinus Torvalds { 1221da177e4SLinus Torvalds icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos, skb->dev); 1231da177e4SLinus Torvalds kfree_skb(skb); 1241da177e4SLinus Torvalds } 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds /* 1271da177e4SLinus Torvalds * Figure out, may we reply to this packet with icmp error. 1281da177e4SLinus Torvalds * 1291da177e4SLinus Torvalds * We do not reply, if: 1301da177e4SLinus Torvalds * - it was icmp error message. 1311da177e4SLinus Torvalds * - it is truncated, so that it is known, that protocol is ICMPV6 1321da177e4SLinus Torvalds * (i.e. in the middle of some exthdr) 1331da177e4SLinus Torvalds * 1341da177e4SLinus Torvalds * --ANK (980726) 1351da177e4SLinus Torvalds */ 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvalds static int is_ineligible(struct sk_buff *skb) 1381da177e4SLinus Torvalds { 1390660e03fSArnaldo Carvalho de Melo int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; 1401da177e4SLinus Torvalds int len = skb->len - ptr; 1410660e03fSArnaldo Carvalho de Melo __u8 nexthdr = ipv6_hdr(skb)->nexthdr; 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds if (len < 0) 1441da177e4SLinus Torvalds return 1; 1451da177e4SLinus Torvalds 1460d3d077cSHerbert Xu ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr); 1471da177e4SLinus Torvalds if (ptr < 0) 1481da177e4SLinus Torvalds return 0; 1491da177e4SLinus Torvalds if (nexthdr == IPPROTO_ICMPV6) { 1501da177e4SLinus Torvalds u8 _type, *tp; 1511da177e4SLinus Torvalds tp = skb_header_pointer(skb, 1521da177e4SLinus Torvalds ptr+offsetof(struct icmp6hdr, icmp6_type), 1531da177e4SLinus Torvalds sizeof(_type), &_type); 1541da177e4SLinus Torvalds if (tp == NULL || 1551da177e4SLinus Torvalds !(*tp & ICMPV6_INFOMSG_MASK)) 1561da177e4SLinus Torvalds return 1; 1571da177e4SLinus Torvalds } 1581da177e4SLinus Torvalds return 0; 1591da177e4SLinus Torvalds } 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds /* 1621da177e4SLinus Torvalds * Check the ICMP output rate limit 1631da177e4SLinus Torvalds */ 164d5fdd6baSBrian Haley static inline int icmpv6_xrlim_allow(struct sock *sk, u8 type, 1651da177e4SLinus Torvalds struct flowi *fl) 1661da177e4SLinus Torvalds { 1671da177e4SLinus Torvalds struct dst_entry *dst; 1683b1e0a65SYOSHIFUJI Hideaki struct net *net = sock_net(sk); 1691da177e4SLinus Torvalds int res = 0; 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds /* Informational messages are not limited. */ 1721da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 1731da177e4SLinus Torvalds return 1; 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds /* Do not limit pmtu discovery, it would break it. */ 1761da177e4SLinus Torvalds if (type == ICMPV6_PKT_TOOBIG) 1771da177e4SLinus Torvalds return 1; 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds /* 1801da177e4SLinus Torvalds * Look up the output route. 1811da177e4SLinus Torvalds * XXX: perhaps the expire for routing entries cloned by 1821da177e4SLinus Torvalds * this lookup should be more aggressive (not longer than timeout). 1831da177e4SLinus Torvalds */ 1849a43b709SBenjamin Thery dst = ip6_route_output(net, sk, fl); 1851da177e4SLinus Torvalds if (dst->error) { 1863bd653c8SDenis V. Lunev IP6_INC_STATS(net, ip6_dst_idev(dst), 187a11d206dSYOSHIFUJI Hideaki IPSTATS_MIB_OUTNOROUTES); 1881da177e4SLinus Torvalds } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { 1891da177e4SLinus Torvalds res = 1; 1901da177e4SLinus Torvalds } else { 1911da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 1929a43b709SBenjamin Thery int tmo = net->ipv6.sysctl.icmpv6_time; 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds /* Give more bandwidth to wider prefixes. */ 1951da177e4SLinus Torvalds if (rt->rt6i_dst.plen < 128) 1961da177e4SLinus Torvalds tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 1971da177e4SLinus Torvalds 1981da177e4SLinus Torvalds res = xrlim_allow(dst, tmo); 1991da177e4SLinus Torvalds } 2001da177e4SLinus Torvalds dst_release(dst); 2011da177e4SLinus Torvalds return res; 2021da177e4SLinus Torvalds } 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds /* 2051da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2061da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2071da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2081da177e4SLinus Torvalds * highest-order two bits set to 10 2091da177e4SLinus Torvalds */ 2101da177e4SLinus Torvalds 2111da177e4SLinus Torvalds static __inline__ int opt_unrec(struct sk_buff *skb, __u32 offset) 2121da177e4SLinus Torvalds { 2131da177e4SLinus Torvalds u8 _optval, *op; 2141da177e4SLinus Torvalds 215bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2161da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 2171da177e4SLinus Torvalds if (op == NULL) 2181da177e4SLinus Torvalds return 1; 2191da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2201da177e4SLinus Torvalds } 2211da177e4SLinus Torvalds 2221da177e4SLinus Torvalds static int icmpv6_push_pending_frames(struct sock *sk, struct flowi *fl, struct icmp6hdr *thdr, int len) 2231da177e4SLinus Torvalds { 2241da177e4SLinus Torvalds struct sk_buff *skb; 2251da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2261da177e4SLinus Torvalds int err = 0; 2271da177e4SLinus Torvalds 2281da177e4SLinus Torvalds if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 2291da177e4SLinus Torvalds goto out; 2301da177e4SLinus Torvalds 231cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2321da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2331da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2341da177e4SLinus Torvalds 2351da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 23607f0757aSJoe Perches skb->csum = csum_partial(icmp6h, 2371da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2381da177e4SLinus Torvalds icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src, 2391da177e4SLinus Torvalds &fl->fl6_dst, 2401da177e4SLinus Torvalds len, fl->proto, 2411da177e4SLinus Torvalds skb->csum); 2421da177e4SLinus Torvalds } else { 243868c86bcSAl Viro __wsum tmp_csum = 0; 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2461da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2471da177e4SLinus Torvalds } 2481da177e4SLinus Torvalds 24907f0757aSJoe Perches tmp_csum = csum_partial(icmp6h, 2501da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 251868c86bcSAl Viro icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src, 2521da177e4SLinus Torvalds &fl->fl6_dst, 253868c86bcSAl Viro len, fl->proto, 254868c86bcSAl Viro tmp_csum); 2551da177e4SLinus Torvalds } 2561da177e4SLinus Torvalds ip6_push_pending_frames(sk); 2571da177e4SLinus Torvalds out: 2581da177e4SLinus Torvalds return err; 2591da177e4SLinus Torvalds } 2601da177e4SLinus Torvalds 2611da177e4SLinus Torvalds struct icmpv6_msg { 2621da177e4SLinus Torvalds struct sk_buff *skb; 2631da177e4SLinus Torvalds int offset; 264763ecff1SYasuyuki Kozakai uint8_t type; 2651da177e4SLinus Torvalds }; 2661da177e4SLinus Torvalds 2671da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 2681da177e4SLinus Torvalds { 2691da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 2701da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 2715f92a738SAl Viro __wsum csum = 0; 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 2741da177e4SLinus Torvalds to, len, csum); 2751da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 276763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 277763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 2781da177e4SLinus Torvalds return 0; 2791da177e4SLinus Torvalds } 2801da177e4SLinus Torvalds 28159fbb3a6SMasahide NAKAMURA #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 28279383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 28379383236SMasahide NAKAMURA { 2840660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 28579383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 28679383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 28779383236SMasahide NAKAMURA struct in6_addr tmp; 28879383236SMasahide NAKAMURA int off; 28979383236SMasahide NAKAMURA 29079383236SMasahide NAKAMURA if (opt->dsthao) { 29179383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 29279383236SMasahide NAKAMURA if (likely(off >= 0)) { 293d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 294d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 29579383236SMasahide NAKAMURA ipv6_addr_copy(&tmp, &iph->saddr); 29679383236SMasahide NAKAMURA ipv6_addr_copy(&iph->saddr, &hao->addr); 29779383236SMasahide NAKAMURA ipv6_addr_copy(&hao->addr, &tmp); 29879383236SMasahide NAKAMURA } 29979383236SMasahide NAKAMURA } 30079383236SMasahide NAKAMURA } 30179383236SMasahide NAKAMURA #else 30279383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 30379383236SMasahide NAKAMURA #endif 30479383236SMasahide NAKAMURA 3051da177e4SLinus Torvalds /* 3061da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 3071da177e4SLinus Torvalds */ 308d5fdd6baSBrian Haley void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info, 3091da177e4SLinus Torvalds struct net_device *dev) 3101da177e4SLinus Torvalds { 311c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 3121da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 3130660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 31484427d53SYOSHIFUJI Hideaki struct sock *sk; 31584427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 3161da177e4SLinus Torvalds struct in6_addr *saddr = NULL; 3171da177e4SLinus Torvalds struct dst_entry *dst; 3188b7817f3SHerbert Xu struct dst_entry *dst2; 3191da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 3201da177e4SLinus Torvalds struct flowi fl; 3218b7817f3SHerbert Xu struct flowi fl2; 3221da177e4SLinus Torvalds struct icmpv6_msg msg; 3231da177e4SLinus Torvalds int iif = 0; 3241da177e4SLinus Torvalds int addr_type = 0; 3251da177e4SLinus Torvalds int len; 326e651f03aSGerrit Renker int hlimit; 3271da177e4SLinus Torvalds int err = 0; 3281da177e4SLinus Torvalds 32927a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 33027a884dcSArnaldo Carvalho de Melo (skb->network_header + sizeof(*hdr)) > skb->tail) 3311da177e4SLinus Torvalds return; 3321da177e4SLinus Torvalds 3331da177e4SLinus Torvalds /* 3341da177e4SLinus Torvalds * Make sure we respect the rules 3351da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 3361da177e4SLinus Torvalds * Rule (e.1) is enforced by not using icmpv6_send 3371da177e4SLinus Torvalds * in any code that processes icmp errors. 3381da177e4SLinus Torvalds */ 3391da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 3401da177e4SLinus Torvalds 3419a43b709SBenjamin Thery if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0)) 3421da177e4SLinus Torvalds saddr = &hdr->daddr; 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds /* 3451da177e4SLinus Torvalds * Dest addr check 3461da177e4SLinus Torvalds */ 3471da177e4SLinus Torvalds 3481da177e4SLinus Torvalds if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) { 3491da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 3501da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 3511da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 3521da177e4SLinus Torvalds (opt_unrec(skb, info)))) 3531da177e4SLinus Torvalds return; 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds saddr = NULL; 3561da177e4SLinus Torvalds } 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds /* 3611da177e4SLinus Torvalds * Source addr check 3621da177e4SLinus Torvalds */ 3631da177e4SLinus Torvalds 3641da177e4SLinus Torvalds if (addr_type & IPV6_ADDR_LINKLOCAL) 3651da177e4SLinus Torvalds iif = skb->dev->ifindex; 3661da177e4SLinus Torvalds 3671da177e4SLinus Torvalds /* 3688de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 3698de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 3708de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 3718de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 3721da177e4SLinus Torvalds */ 3731da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 37464ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n"); 3751da177e4SLinus Torvalds return; 3761da177e4SLinus Torvalds } 3771da177e4SLinus Torvalds 3781da177e4SLinus Torvalds /* 3791da177e4SLinus Torvalds * Never answer to a ICMP packet. 3801da177e4SLinus Torvalds */ 3811da177e4SLinus Torvalds if (is_ineligible(skb)) { 38264ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n"); 3831da177e4SLinus Torvalds return; 3841da177e4SLinus Torvalds } 3851da177e4SLinus Torvalds 38679383236SMasahide NAKAMURA mip6_addr_swap(skb); 38779383236SMasahide NAKAMURA 3881da177e4SLinus Torvalds memset(&fl, 0, sizeof(fl)); 3891da177e4SLinus Torvalds fl.proto = IPPROTO_ICMPV6; 3901da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_dst, &hdr->saddr); 3911da177e4SLinus Torvalds if (saddr) 3921da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_src, saddr); 3931da177e4SLinus Torvalds fl.oif = iif; 3941da177e4SLinus Torvalds fl.fl_icmp_type = type; 3951da177e4SLinus Torvalds fl.fl_icmp_code = code; 396beb8d13bSVenkat Yekkirala security_skb_classify_flow(skb, &fl); 3971da177e4SLinus Torvalds 398fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 399fdc0bde9SDenis V. Lunev if (sk == NULL) 400405666dbSDenis V. Lunev return; 401fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 402405666dbSDenis V. Lunev 4031da177e4SLinus Torvalds if (!icmpv6_xrlim_allow(sk, type, &fl)) 4041da177e4SLinus Torvalds goto out; 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 4071da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 4081da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 4091da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 4101da177e4SLinus Torvalds 4111da177e4SLinus Torvalds if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 4121da177e4SLinus Torvalds fl.oif = np->mcast_oif; 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds err = ip6_dst_lookup(sk, &dst, &fl); 4151da177e4SLinus Torvalds if (err) 4161da177e4SLinus Torvalds goto out; 4178de3351eSYOSHIFUJI Hideaki 4188de3351eSYOSHIFUJI Hideaki /* 4198de3351eSYOSHIFUJI Hideaki * We won't send icmp if the destination is known 4208de3351eSYOSHIFUJI Hideaki * anycast. 4218de3351eSYOSHIFUJI Hideaki */ 4228de3351eSYOSHIFUJI Hideaki if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { 4238de3351eSYOSHIFUJI Hideaki LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n"); 4248de3351eSYOSHIFUJI Hideaki goto out_dst_release; 4258de3351eSYOSHIFUJI Hideaki } 4268de3351eSYOSHIFUJI Hideaki 4278b7817f3SHerbert Xu /* No need to clone since we're just using its address. */ 4288b7817f3SHerbert Xu dst2 = dst; 4298b7817f3SHerbert Xu 43052479b62SAlexey Dobriyan err = xfrm_lookup(net, &dst, &fl, sk, 0); 4318b7817f3SHerbert Xu switch (err) { 4328b7817f3SHerbert Xu case 0: 4338b7817f3SHerbert Xu if (dst != dst2) 4348b7817f3SHerbert Xu goto route_done; 4358b7817f3SHerbert Xu break; 4368b7817f3SHerbert Xu case -EPERM: 4378b7817f3SHerbert Xu dst = NULL; 4388b7817f3SHerbert Xu break; 4398b7817f3SHerbert Xu default: 4408b7817f3SHerbert Xu goto out; 4418b7817f3SHerbert Xu } 4428b7817f3SHerbert Xu 4438b7817f3SHerbert Xu if (xfrm_decode_session_reverse(skb, &fl2, AF_INET6)) 444af268182SHerbert Xu goto relookup_failed; 4451da177e4SLinus Torvalds 4466c06a478SJiri Pirko if (ip6_dst_lookup(sk, &dst2, &fl2)) 447af268182SHerbert Xu goto relookup_failed; 4488b7817f3SHerbert Xu 4496c06a478SJiri Pirko err = xfrm_lookup(net, &dst2, &fl2, sk, XFRM_LOOKUP_ICMP); 450af268182SHerbert Xu switch (err) { 451af268182SHerbert Xu case 0: 4528b7817f3SHerbert Xu dst_release(dst); 4538b7817f3SHerbert Xu dst = dst2; 454af268182SHerbert Xu break; 455af268182SHerbert Xu case -EPERM: 456af268182SHerbert Xu goto out_dst_release; 457af268182SHerbert Xu default: 458af268182SHerbert Xu relookup_failed: 459af268182SHerbert Xu if (!dst) 4608b7817f3SHerbert Xu goto out; 461af268182SHerbert Xu break; 462af268182SHerbert Xu } 4638b7817f3SHerbert Xu 4648b7817f3SHerbert Xu route_done: 4651da177e4SLinus Torvalds if (ipv6_addr_is_multicast(&fl.fl6_dst)) 4661da177e4SLinus Torvalds hlimit = np->mcast_hops; 4671da177e4SLinus Torvalds else 4681da177e4SLinus Torvalds hlimit = np->hop_limit; 4691da177e4SLinus Torvalds if (hlimit < 0) 4706b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 4711da177e4SLinus Torvalds 4721da177e4SLinus Torvalds msg.skb = skb; 473bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 474763ecff1SYasuyuki Kozakai msg.type = type; 4751da177e4SLinus Torvalds 4761da177e4SLinus Torvalds len = skb->len - msg.offset; 4771da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); 4781da177e4SLinus Torvalds if (len < 0) { 47964ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n"); 4801da177e4SLinus Torvalds goto out_dst_release; 4811da177e4SLinus Torvalds } 4821da177e4SLinus Torvalds 4831da177e4SLinus Torvalds idev = in6_dev_get(skb->dev); 4841da177e4SLinus Torvalds 4851da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, 4861da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 487e651f03aSGerrit Renker sizeof(struct icmp6hdr), hlimit, 488e651f03aSGerrit Renker np->tclass, NULL, &fl, (struct rt6_info*)dst, 4891da177e4SLinus Torvalds MSG_DONTWAIT); 4901da177e4SLinus Torvalds if (err) { 4911da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 4921da177e4SLinus Torvalds goto out_put; 4931da177e4SLinus Torvalds } 4941da177e4SLinus Torvalds err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, len + sizeof(struct icmp6hdr)); 4951da177e4SLinus Torvalds 4961da177e4SLinus Torvalds out_put: 4971da177e4SLinus Torvalds if (likely(idev != NULL)) 4981da177e4SLinus Torvalds in6_dev_put(idev); 4991da177e4SLinus Torvalds out_dst_release: 5001da177e4SLinus Torvalds dst_release(dst); 5011da177e4SLinus Torvalds out: 502405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5031da177e4SLinus Torvalds } 5041da177e4SLinus Torvalds 5057159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_send); 5067159039aSYOSHIFUJI Hideaki 5071da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 5081da177e4SLinus Torvalds { 509c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 51084427d53SYOSHIFUJI Hideaki struct sock *sk; 5111da177e4SLinus Torvalds struct inet6_dev *idev; 51284427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 5131da177e4SLinus Torvalds struct in6_addr *saddr = NULL; 514cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 5151da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 5161da177e4SLinus Torvalds struct flowi fl; 5171da177e4SLinus Torvalds struct icmpv6_msg msg; 5181da177e4SLinus Torvalds struct dst_entry *dst; 5191da177e4SLinus Torvalds int err = 0; 5201da177e4SLinus Torvalds int hlimit; 5211da177e4SLinus Torvalds 5220660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 5231da177e4SLinus Torvalds 5241da177e4SLinus Torvalds if (!ipv6_unicast_destination(skb)) 5251da177e4SLinus Torvalds saddr = NULL; 5261da177e4SLinus Torvalds 5271da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 5281da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 5291da177e4SLinus Torvalds 5301da177e4SLinus Torvalds memset(&fl, 0, sizeof(fl)); 5311da177e4SLinus Torvalds fl.proto = IPPROTO_ICMPV6; 5320660e03fSArnaldo Carvalho de Melo ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); 5331da177e4SLinus Torvalds if (saddr) 5341da177e4SLinus Torvalds ipv6_addr_copy(&fl.fl6_src, saddr); 5351da177e4SLinus Torvalds fl.oif = skb->dev->ifindex; 5361da177e4SLinus Torvalds fl.fl_icmp_type = ICMPV6_ECHO_REPLY; 537beb8d13bSVenkat Yekkirala security_skb_classify_flow(skb, &fl); 5381da177e4SLinus Torvalds 539fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 540fdc0bde9SDenis V. Lunev if (sk == NULL) 541405666dbSDenis V. Lunev return; 542fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 543405666dbSDenis V. Lunev 5441da177e4SLinus Torvalds if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 5451da177e4SLinus Torvalds fl.oif = np->mcast_oif; 5461da177e4SLinus Torvalds 5471da177e4SLinus Torvalds err = ip6_dst_lookup(sk, &dst, &fl); 5481da177e4SLinus Torvalds if (err) 5491da177e4SLinus Torvalds goto out; 55052479b62SAlexey Dobriyan if ((err = xfrm_lookup(net, &dst, &fl, sk, 0)) < 0) 551e104411bSPatrick McHardy goto out; 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds if (ipv6_addr_is_multicast(&fl.fl6_dst)) 5541da177e4SLinus Torvalds hlimit = np->mcast_hops; 5551da177e4SLinus Torvalds else 5561da177e4SLinus Torvalds hlimit = np->hop_limit; 5571da177e4SLinus Torvalds if (hlimit < 0) 5586b75d090SYOSHIFUJI Hideaki hlimit = ip6_dst_hoplimit(dst); 5591da177e4SLinus Torvalds 5601da177e4SLinus Torvalds idev = in6_dev_get(skb->dev); 5611da177e4SLinus Torvalds 5621da177e4SLinus Torvalds msg.skb = skb; 5631da177e4SLinus Torvalds msg.offset = 0; 564763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 5651da177e4SLinus Torvalds 5661da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 567e651f03aSGerrit Renker sizeof(struct icmp6hdr), hlimit, np->tclass, NULL, &fl, 5681da177e4SLinus Torvalds (struct rt6_info*)dst, MSG_DONTWAIT); 5691da177e4SLinus Torvalds 5701da177e4SLinus Torvalds if (err) { 5711da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 5721da177e4SLinus Torvalds goto out_put; 5731da177e4SLinus Torvalds } 5741da177e4SLinus Torvalds err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, skb->len + sizeof(struct icmp6hdr)); 5751da177e4SLinus Torvalds 5761da177e4SLinus Torvalds out_put: 5771da177e4SLinus Torvalds if (likely(idev != NULL)) 5781da177e4SLinus Torvalds in6_dev_put(idev); 5791da177e4SLinus Torvalds dst_release(dst); 5801da177e4SLinus Torvalds out: 581405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5821da177e4SLinus Torvalds } 5831da177e4SLinus Torvalds 584d5fdd6baSBrian Haley static void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 5851da177e4SLinus Torvalds { 58641135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 5871da177e4SLinus Torvalds int inner_offset; 5881da177e4SLinus Torvalds int hash; 5891da177e4SLinus Torvalds u8 nexthdr; 5901da177e4SLinus Torvalds 5911da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 5921da177e4SLinus Torvalds return; 5931da177e4SLinus Torvalds 5941da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 5951da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 5961da177e4SLinus Torvalds /* now skip over extension headers */ 5970d3d077cSHerbert Xu inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr); 5981da177e4SLinus Torvalds if (inner_offset<0) 5991da177e4SLinus Torvalds return; 6001da177e4SLinus Torvalds } else { 6011da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 6021da177e4SLinus Torvalds } 6031da177e4SLinus Torvalds 6041da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 6051da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 6061da177e4SLinus Torvalds return; 6071da177e4SLinus Torvalds 6081da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 6091da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 6101da177e4SLinus Torvalds pmtu discovery. 6111da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 6121da177e4SLinus Torvalds --ANK (980726) 6131da177e4SLinus Torvalds */ 6141da177e4SLinus Torvalds 6151da177e4SLinus Torvalds hash = nexthdr & (MAX_INET_PROTOS - 1); 6161da177e4SLinus Torvalds 6171da177e4SLinus Torvalds rcu_read_lock(); 6181da177e4SLinus Torvalds ipprot = rcu_dereference(inet6_protos[hash]); 6191da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 6201da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 6211da177e4SLinus Torvalds rcu_read_unlock(); 6221da177e4SLinus Torvalds 62369d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 6241da177e4SLinus Torvalds } 6251da177e4SLinus Torvalds 6261da177e4SLinus Torvalds /* 6271da177e4SLinus Torvalds * Handle icmp messages 6281da177e4SLinus Torvalds */ 6291da177e4SLinus Torvalds 630e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 6311da177e4SLinus Torvalds { 6321da177e4SLinus Torvalds struct net_device *dev = skb->dev; 6331da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 6341da177e4SLinus Torvalds struct in6_addr *saddr, *daddr; 6351da177e4SLinus Torvalds struct ipv6hdr *orig_hdr; 6361da177e4SLinus Torvalds struct icmp6hdr *hdr; 637d5fdd6baSBrian Haley u8 type; 6381da177e4SLinus Torvalds 639aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 640def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 6418b7817f3SHerbert Xu int nh; 6428b7817f3SHerbert Xu 643def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 644aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 645aebcf82cSHerbert Xu goto drop_no_count; 646aebcf82cSHerbert Xu 6478b7817f3SHerbert Xu if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(*orig_hdr))) 6488b7817f3SHerbert Xu goto drop_no_count; 6498b7817f3SHerbert Xu 6508b7817f3SHerbert Xu nh = skb_network_offset(skb); 6518b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 6528b7817f3SHerbert Xu 6538b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 6548b7817f3SHerbert Xu goto drop_no_count; 6558b7817f3SHerbert Xu 6568b7817f3SHerbert Xu skb_set_network_header(skb, nh); 6578b7817f3SHerbert Xu } 6588b7817f3SHerbert Xu 659e41b5368SDenis V. Lunev ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INMSGS); 6601da177e4SLinus Torvalds 6610660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 6620660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 6631da177e4SLinus Torvalds 6641da177e4SLinus Torvalds /* Perform checksum. */ 665fb286bb2SHerbert Xu switch (skb->ip_summed) { 66684fa7933SPatrick McHardy case CHECKSUM_COMPLETE: 667fb286bb2SHerbert Xu if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, 668fb286bb2SHerbert Xu skb->csum)) 669fb286bb2SHerbert Xu break; 670fb286bb2SHerbert Xu /* fall through */ 671fb286bb2SHerbert Xu case CHECKSUM_NONE: 672868c86bcSAl Viro skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len, 673868c86bcSAl Viro IPPROTO_ICMPV6, 0)); 674fb286bb2SHerbert Xu if (__skb_checksum_complete(skb)) { 6755b095d98SHarvey Harrison LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [%pI6 > %pI6]\n", 6760c6ce78aSHarvey Harrison saddr, daddr); 6771da177e4SLinus Torvalds goto discard_it; 6781da177e4SLinus Torvalds } 6791da177e4SLinus Torvalds } 6801da177e4SLinus Torvalds 6818cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 6828cf22943SHerbert Xu goto discard_it; 6831da177e4SLinus Torvalds 684cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvalds type = hdr->icmp6_type; 6871da177e4SLinus Torvalds 68855d43808SDenis V. Lunev ICMP6MSGIN_INC_STATS_BH(dev_net(dev), idev, type); 6891da177e4SLinus Torvalds 6901da177e4SLinus Torvalds switch (type) { 6911da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 6921da177e4SLinus Torvalds icmpv6_echo_reply(skb); 6931da177e4SLinus Torvalds break; 6941da177e4SLinus Torvalds 6951da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 6961da177e4SLinus Torvalds /* we couldn't care less */ 6971da177e4SLinus Torvalds break; 6981da177e4SLinus Torvalds 6991da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 7001da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 7011da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 7021da177e4SLinus Torvalds destination cache will allow to solve this problem 7031da177e4SLinus Torvalds --ANK (980726) 7041da177e4SLinus Torvalds */ 7051da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 7061da177e4SLinus Torvalds goto discard_it; 707cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 7081da177e4SLinus Torvalds orig_hdr = (struct ipv6hdr *) (hdr + 1); 7091da177e4SLinus Torvalds rt6_pmtu_discovery(&orig_hdr->daddr, &orig_hdr->saddr, dev, 7101da177e4SLinus Torvalds ntohl(hdr->icmp6_mtu)); 7111da177e4SLinus Torvalds 7121da177e4SLinus Torvalds /* 7131da177e4SLinus Torvalds * Drop through to notify 7141da177e4SLinus Torvalds */ 7151da177e4SLinus Torvalds 7161da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 7171da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 7181da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 7191da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7201da177e4SLinus Torvalds break; 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 7231da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 7241da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 7251da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 7261da177e4SLinus Torvalds case NDISC_REDIRECT: 7271da177e4SLinus Torvalds ndisc_rcv(skb); 7281da177e4SLinus Torvalds break; 7291da177e4SLinus Torvalds 7301da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 7311da177e4SLinus Torvalds igmp6_event_query(skb); 7321da177e4SLinus Torvalds break; 7331da177e4SLinus Torvalds 7341da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 7351da177e4SLinus Torvalds igmp6_event_report(skb); 7361da177e4SLinus Torvalds break; 7371da177e4SLinus Torvalds 7381da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 7391da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 7401da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 7411da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 7421da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 7431da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 7441da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 7451da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 7461da177e4SLinus Torvalds break; 7471da177e4SLinus Torvalds 7481da177e4SLinus Torvalds default: 74964ce2073SPatrick McHardy LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n"); 7501da177e4SLinus Torvalds 7511da177e4SLinus Torvalds /* informational */ 7521da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 7531da177e4SLinus Torvalds break; 7541da177e4SLinus Torvalds 7551da177e4SLinus Torvalds /* 7561da177e4SLinus Torvalds * error of unknown type. 7571da177e4SLinus Torvalds * must pass to upper level 7581da177e4SLinus Torvalds */ 7591da177e4SLinus Torvalds 7601da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 7613ff50b79SStephen Hemminger } 7623ff50b79SStephen Hemminger 7631da177e4SLinus Torvalds kfree_skb(skb); 7641da177e4SLinus Torvalds return 0; 7651da177e4SLinus Torvalds 7661da177e4SLinus Torvalds discard_it: 767e41b5368SDenis V. Lunev ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INERRORS); 7688b7817f3SHerbert Xu drop_no_count: 7691da177e4SLinus Torvalds kfree_skb(skb); 7701da177e4SLinus Torvalds return 0; 7711da177e4SLinus Torvalds } 7721da177e4SLinus Torvalds 77395e41e93SYOSHIFUJI Hideaki void icmpv6_flow_init(struct sock *sk, struct flowi *fl, 77495e41e93SYOSHIFUJI Hideaki u8 type, 77595e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 77695e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 77795e41e93SYOSHIFUJI Hideaki int oif) 77895e41e93SYOSHIFUJI Hideaki { 77995e41e93SYOSHIFUJI Hideaki memset(fl, 0, sizeof(*fl)); 78095e41e93SYOSHIFUJI Hideaki ipv6_addr_copy(&fl->fl6_src, saddr); 78195e41e93SYOSHIFUJI Hideaki ipv6_addr_copy(&fl->fl6_dst, daddr); 78295e41e93SYOSHIFUJI Hideaki fl->proto = IPPROTO_ICMPV6; 78395e41e93SYOSHIFUJI Hideaki fl->fl_icmp_type = type; 78495e41e93SYOSHIFUJI Hideaki fl->fl_icmp_code = 0; 78595e41e93SYOSHIFUJI Hideaki fl->oif = oif; 78695e41e93SYOSHIFUJI Hideaki security_sk_classify_flow(sk, fl); 78795e41e93SYOSHIFUJI Hideaki } 78895e41e93SYOSHIFUJI Hideaki 789640c41c7SIngo Molnar /* 790b7e729c4SDenis V. Lunev * Special lock-class for __icmpv6_sk: 791640c41c7SIngo Molnar */ 792640c41c7SIngo Molnar static struct lock_class_key icmpv6_socket_sk_dst_lock_key; 793640c41c7SIngo Molnar 79498c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 7951da177e4SLinus Torvalds { 7961da177e4SLinus Torvalds struct sock *sk; 7971da177e4SLinus Torvalds int err, i, j; 7981da177e4SLinus Torvalds 79998c6d1b2SDenis V. Lunev net->ipv6.icmp_sk = 80098c6d1b2SDenis V. Lunev kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); 80198c6d1b2SDenis V. Lunev if (net->ipv6.icmp_sk == NULL) 80279c91159SDenis V. Lunev return -ENOMEM; 80379c91159SDenis V. Lunev 8046f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8051ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 8061ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 8071da177e4SLinus Torvalds if (err < 0) { 8081da177e4SLinus Torvalds printk(KERN_ERR 8091da177e4SLinus Torvalds "Failed to initialize the ICMP6 control socket " 8101da177e4SLinus Torvalds "(err %d).\n", 8111da177e4SLinus Torvalds err); 8121da177e4SLinus Torvalds goto fail; 8131da177e4SLinus Torvalds } 8141da177e4SLinus Torvalds 8151ed8516fSDenis V. Lunev net->ipv6.icmp_sk[i] = sk; 8165c8cafd6SDenis V. Lunev 817640c41c7SIngo Molnar /* 818640c41c7SIngo Molnar * Split off their lock-class, because sk->sk_dst_lock 819640c41c7SIngo Molnar * gets used from softirqs, which is safe for 820b7e729c4SDenis V. Lunev * __icmpv6_sk (because those never get directly used 821640c41c7SIngo Molnar * via userspace syscalls), but unsafe for normal sockets. 822640c41c7SIngo Molnar */ 823640c41c7SIngo Molnar lockdep_set_class(&sk->sk_dst_lock, 824640c41c7SIngo Molnar &icmpv6_socket_sk_dst_lock_key); 8251da177e4SLinus Torvalds 8261da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 8271da177e4SLinus Torvalds * sk_buff struct overhead. 8281da177e4SLinus Torvalds */ 8291da177e4SLinus Torvalds sk->sk_sndbuf = 8301da177e4SLinus Torvalds (2 * ((64 * 1024) + sizeof(struct sk_buff))); 8311da177e4SLinus Torvalds } 8321da177e4SLinus Torvalds return 0; 8331da177e4SLinus Torvalds 8341da177e4SLinus Torvalds fail: 8355c8cafd6SDenis V. Lunev for (j = 0; j < i; j++) 8361ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); 83798c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 8381da177e4SLinus Torvalds return err; 8391da177e4SLinus Torvalds } 8401da177e4SLinus Torvalds 84198c6d1b2SDenis V. Lunev static void __net_exit icmpv6_sk_exit(struct net *net) 8421da177e4SLinus Torvalds { 8431da177e4SLinus Torvalds int i; 8441da177e4SLinus Torvalds 8456f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 8461ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); 8471da177e4SLinus Torvalds } 84898c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 84998c6d1b2SDenis V. Lunev } 85098c6d1b2SDenis V. Lunev 8518ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 85298c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 85398c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 85498c6d1b2SDenis V. Lunev }; 85598c6d1b2SDenis V. Lunev 85698c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 85798c6d1b2SDenis V. Lunev { 85898c6d1b2SDenis V. Lunev int err; 85998c6d1b2SDenis V. Lunev 86098c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 86198c6d1b2SDenis V. Lunev if (err < 0) 86298c6d1b2SDenis V. Lunev return err; 86398c6d1b2SDenis V. Lunev 86498c6d1b2SDenis V. Lunev err = -EAGAIN; 86598c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 86698c6d1b2SDenis V. Lunev goto fail; 86798c6d1b2SDenis V. Lunev return 0; 86898c6d1b2SDenis V. Lunev 86998c6d1b2SDenis V. Lunev fail: 87098c6d1b2SDenis V. Lunev printk(KERN_ERR "Failed to register ICMP6 protocol\n"); 87198c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 87298c6d1b2SDenis V. Lunev return err; 87398c6d1b2SDenis V. Lunev } 87498c6d1b2SDenis V. Lunev 8758ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 87698c6d1b2SDenis V. Lunev { 87798c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 8781da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 8791da177e4SLinus Torvalds } 8801da177e4SLinus Torvalds 88198c6d1b2SDenis V. Lunev 8829b5b5cffSArjan van de Ven static const struct icmp6_err { 8831da177e4SLinus Torvalds int err; 8841da177e4SLinus Torvalds int fatal; 8851da177e4SLinus Torvalds } tab_unreach[] = { 8861da177e4SLinus Torvalds { /* NOROUTE */ 8871da177e4SLinus Torvalds .err = ENETUNREACH, 8881da177e4SLinus Torvalds .fatal = 0, 8891da177e4SLinus Torvalds }, 8901da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 8911da177e4SLinus Torvalds .err = EACCES, 8921da177e4SLinus Torvalds .fatal = 1, 8931da177e4SLinus Torvalds }, 8941da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 8951da177e4SLinus Torvalds .err = EHOSTUNREACH, 8961da177e4SLinus Torvalds .fatal = 0, 8971da177e4SLinus Torvalds }, 8981da177e4SLinus Torvalds { /* ADDR_UNREACH */ 8991da177e4SLinus Torvalds .err = EHOSTUNREACH, 9001da177e4SLinus Torvalds .fatal = 0, 9011da177e4SLinus Torvalds }, 9021da177e4SLinus Torvalds { /* PORT_UNREACH */ 9031da177e4SLinus Torvalds .err = ECONNREFUSED, 9041da177e4SLinus Torvalds .fatal = 1, 9051da177e4SLinus Torvalds }, 9061da177e4SLinus Torvalds }; 9071da177e4SLinus Torvalds 908d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 9091da177e4SLinus Torvalds { 9101da177e4SLinus Torvalds int fatal = 0; 9111da177e4SLinus Torvalds 9121da177e4SLinus Torvalds *err = EPROTO; 9131da177e4SLinus Torvalds 9141da177e4SLinus Torvalds switch (type) { 9151da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 9161da177e4SLinus Torvalds fatal = 1; 9171da177e4SLinus Torvalds if (code <= ICMPV6_PORT_UNREACH) { 9181da177e4SLinus Torvalds *err = tab_unreach[code].err; 9191da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 9201da177e4SLinus Torvalds } 9211da177e4SLinus Torvalds break; 9221da177e4SLinus Torvalds 9231da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 9241da177e4SLinus Torvalds *err = EMSGSIZE; 9251da177e4SLinus Torvalds break; 9261da177e4SLinus Torvalds 9271da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 9281da177e4SLinus Torvalds *err = EPROTO; 9291da177e4SLinus Torvalds fatal = 1; 9301da177e4SLinus Torvalds break; 9311da177e4SLinus Torvalds 9321da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 9331da177e4SLinus Torvalds *err = EHOSTUNREACH; 9341da177e4SLinus Torvalds break; 9353ff50b79SStephen Hemminger } 9361da177e4SLinus Torvalds 9371da177e4SLinus Torvalds return fatal; 9381da177e4SLinus Torvalds } 9391da177e4SLinus Torvalds 9407159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 9417159039aSYOSHIFUJI Hideaki 9421da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 943760f2d01SDaniel Lezcano ctl_table ipv6_icmp_table_template[] = { 9441da177e4SLinus Torvalds { 9451da177e4SLinus Torvalds .procname = "ratelimit", 94641a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 9471da177e4SLinus Torvalds .maxlen = sizeof(int), 9481da177e4SLinus Torvalds .mode = 0644, 9496d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 9501da177e4SLinus Torvalds }, 951f8572d8fSEric W. Biederman { }, 9521da177e4SLinus Torvalds }; 953760f2d01SDaniel Lezcano 954760f2d01SDaniel Lezcano struct ctl_table *ipv6_icmp_sysctl_init(struct net *net) 955760f2d01SDaniel Lezcano { 956760f2d01SDaniel Lezcano struct ctl_table *table; 957760f2d01SDaniel Lezcano 958760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 959760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 960760f2d01SDaniel Lezcano GFP_KERNEL); 9615ee09105SYOSHIFUJI Hideaki 9625ee09105SYOSHIFUJI Hideaki if (table) 9635ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 9645ee09105SYOSHIFUJI Hideaki 965760f2d01SDaniel Lezcano return table; 966760f2d01SDaniel Lezcano } 9671da177e4SLinus Torvalds #endif 9681da177e4SLinus Torvalds 969