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 32f3213831SJoe Perches #define pr_fmt(fmt) "IPv6: " fmt 33f3213831SJoe Perches 341da177e4SLinus Torvalds #include <linux/module.h> 351da177e4SLinus Torvalds #include <linux/errno.h> 361da177e4SLinus Torvalds #include <linux/types.h> 371da177e4SLinus Torvalds #include <linux/socket.h> 381da177e4SLinus Torvalds #include <linux/in.h> 391da177e4SLinus Torvalds #include <linux/kernel.h> 401da177e4SLinus Torvalds #include <linux/sockios.h> 411da177e4SLinus Torvalds #include <linux/net.h> 421da177e4SLinus Torvalds #include <linux/skbuff.h> 431da177e4SLinus Torvalds #include <linux/init.h> 44763ecff1SYasuyuki Kozakai #include <linux/netfilter.h> 455a0e3ad6STejun Heo #include <linux/slab.h> 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 481da177e4SLinus Torvalds #include <linux/sysctl.h> 491da177e4SLinus Torvalds #endif 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds #include <linux/inet.h> 521da177e4SLinus Torvalds #include <linux/netdevice.h> 531da177e4SLinus Torvalds #include <linux/icmpv6.h> 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds #include <net/ip.h> 561da177e4SLinus Torvalds #include <net/sock.h> 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds #include <net/ipv6.h> 591da177e4SLinus Torvalds #include <net/ip6_checksum.h> 606d0bfe22SLorenzo Colitti #include <net/ping.h> 611da177e4SLinus Torvalds #include <net/protocol.h> 621da177e4SLinus Torvalds #include <net/raw.h> 631da177e4SLinus Torvalds #include <net/rawv6.h> 641da177e4SLinus Torvalds #include <net/transp_v6.h> 651da177e4SLinus Torvalds #include <net/ip6_route.h> 661da177e4SLinus Torvalds #include <net/addrconf.h> 671da177e4SLinus Torvalds #include <net/icmp.h> 688b7817f3SHerbert Xu #include <net/xfrm.h> 691ed8516fSDenis V. Lunev #include <net/inet_common.h> 70825edac4SHannes Frederic Sowa #include <net/dsfield.h> 71ca254490SDavid Ahern #include <net/l3mdev.h> 721da177e4SLinus Torvalds 737c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 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 876f809da2SSteffen Klassert static void icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 886f809da2SSteffen Klassert u8 type, u8 code, int offset, __be32 info) 896f809da2SSteffen Klassert { 906d0bfe22SLorenzo Colitti /* icmpv6_notify checks 8 bytes can be pulled, icmp6hdr is 8 bytes */ 916d0bfe22SLorenzo Colitti struct icmp6hdr *icmp6 = (struct icmp6hdr *) (skb->data + offset); 926f809da2SSteffen Klassert struct net *net = dev_net(skb->dev); 936f809da2SSteffen Klassert 946f809da2SSteffen Klassert if (type == ICMPV6_PKT_TOOBIG) 95e2d118a1SLorenzo Colitti ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); 966f809da2SSteffen Klassert else if (type == NDISC_REDIRECT) 97e2d118a1SLorenzo Colitti ip6_redirect(skb, net, skb->dev->ifindex, 0, 98e2d118a1SLorenzo Colitti sock_net_uid(net, NULL)); 996d0bfe22SLorenzo Colitti 1006d0bfe22SLorenzo Colitti if (!(type & ICMPV6_INFOMSG_MASK)) 1016d0bfe22SLorenzo Colitti if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST) 102dcb94b88SHannes Frederic Sowa ping_err(skb, offset, ntohl(info)); 1036f809da2SSteffen Klassert } 1046f809da2SSteffen Klassert 105e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb); 1061da177e4SLinus Torvalds 10741135cc8SAlexey Dobriyan static const struct inet6_protocol icmpv6_protocol = { 1081da177e4SLinus Torvalds .handler = icmpv6_rcv, 1096f809da2SSteffen Klassert .err_handler = icmpv6_err, 1108b7817f3SHerbert Xu .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 1111da177e4SLinus Torvalds }; 1121da177e4SLinus Torvalds 113fdc0bde9SDenis V. Lunev static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) 1141da177e4SLinus Torvalds { 115fdc0bde9SDenis V. Lunev struct sock *sk; 116fdc0bde9SDenis V. Lunev 1171da177e4SLinus Torvalds local_bh_disable(); 1181da177e4SLinus Torvalds 119fdc0bde9SDenis V. Lunev sk = icmpv6_sk(net); 120405666dbSDenis V. Lunev if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { 1211da177e4SLinus Torvalds /* This can happen if the output path (f.e. SIT or 1221da177e4SLinus Torvalds * ip6ip6 tunnel) signals dst_link_failure() for an 1231da177e4SLinus Torvalds * outgoing ICMP6 packet. 1241da177e4SLinus Torvalds */ 1251da177e4SLinus Torvalds local_bh_enable(); 126fdc0bde9SDenis V. Lunev return NULL; 1271da177e4SLinus Torvalds } 128fdc0bde9SDenis V. Lunev return sk; 1291da177e4SLinus Torvalds } 1301da177e4SLinus Torvalds 131405666dbSDenis V. Lunev static __inline__ void icmpv6_xmit_unlock(struct sock *sk) 1321da177e4SLinus Torvalds { 133405666dbSDenis V. Lunev spin_unlock_bh(&sk->sk_lock.slock); 1341da177e4SLinus Torvalds } 1351da177e4SLinus Torvalds 1361da177e4SLinus Torvalds /* 1371da177e4SLinus Torvalds * Figure out, may we reply to this packet with icmp error. 1381da177e4SLinus Torvalds * 1391da177e4SLinus Torvalds * We do not reply, if: 1401da177e4SLinus Torvalds * - it was icmp error message. 1411da177e4SLinus Torvalds * - it is truncated, so that it is known, that protocol is ICMPV6 1421da177e4SLinus Torvalds * (i.e. in the middle of some exthdr) 1431da177e4SLinus Torvalds * 1441da177e4SLinus Torvalds * --ANK (980726) 1451da177e4SLinus Torvalds */ 1461da177e4SLinus Torvalds 147a50feda5SEric Dumazet static bool is_ineligible(const struct sk_buff *skb) 1481da177e4SLinus Torvalds { 1490660e03fSArnaldo Carvalho de Melo int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; 1501da177e4SLinus Torvalds int len = skb->len - ptr; 1510660e03fSArnaldo Carvalho de Melo __u8 nexthdr = ipv6_hdr(skb)->nexthdr; 15275f2811cSJesse Gross __be16 frag_off; 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds if (len < 0) 155a50feda5SEric Dumazet return true; 1561da177e4SLinus Torvalds 15775f2811cSJesse Gross ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off); 1581da177e4SLinus Torvalds if (ptr < 0) 159a50feda5SEric Dumazet return false; 1601da177e4SLinus Torvalds if (nexthdr == IPPROTO_ICMPV6) { 1611da177e4SLinus Torvalds u8 _type, *tp; 1621da177e4SLinus Torvalds tp = skb_header_pointer(skb, 1631da177e4SLinus Torvalds ptr+offsetof(struct icmp6hdr, icmp6_type), 1641da177e4SLinus Torvalds sizeof(_type), &_type); 16563159f29SIan Morris if (!tp || !(*tp & ICMPV6_INFOMSG_MASK)) 166a50feda5SEric Dumazet return true; 1671da177e4SLinus Torvalds } 168a50feda5SEric Dumazet return false; 1691da177e4SLinus Torvalds } 1701da177e4SLinus Torvalds 171c0303efeSJesper Dangaard Brouer static bool icmpv6_mask_allow(int type) 172c0303efeSJesper Dangaard Brouer { 173c0303efeSJesper Dangaard Brouer /* Informational messages are not limited. */ 174c0303efeSJesper Dangaard Brouer if (type & ICMPV6_INFOMSG_MASK) 175c0303efeSJesper Dangaard Brouer return true; 176c0303efeSJesper Dangaard Brouer 177c0303efeSJesper Dangaard Brouer /* Do not limit pmtu discovery, it would break it. */ 178c0303efeSJesper Dangaard Brouer if (type == ICMPV6_PKT_TOOBIG) 179c0303efeSJesper Dangaard Brouer return true; 180c0303efeSJesper Dangaard Brouer 181c0303efeSJesper Dangaard Brouer return false; 182c0303efeSJesper Dangaard Brouer } 183c0303efeSJesper Dangaard Brouer 184c0303efeSJesper Dangaard Brouer static bool icmpv6_global_allow(int type) 185c0303efeSJesper Dangaard Brouer { 186c0303efeSJesper Dangaard Brouer if (icmpv6_mask_allow(type)) 187c0303efeSJesper Dangaard Brouer return true; 188c0303efeSJesper Dangaard Brouer 189c0303efeSJesper Dangaard Brouer if (icmp_global_allow()) 190c0303efeSJesper Dangaard Brouer return true; 191c0303efeSJesper Dangaard Brouer 192c0303efeSJesper Dangaard Brouer return false; 193c0303efeSJesper Dangaard Brouer } 194c0303efeSJesper Dangaard Brouer 1951da177e4SLinus Torvalds /* 1961da177e4SLinus Torvalds * Check the ICMP output rate limit 1971da177e4SLinus Torvalds */ 1984cdf507dSEric Dumazet static bool icmpv6_xrlim_allow(struct sock *sk, u8 type, 1994c9483b2SDavid S. Miller struct flowi6 *fl6) 2001da177e4SLinus Torvalds { 2013b1e0a65SYOSHIFUJI Hideaki struct net *net = sock_net(sk); 2024cdf507dSEric Dumazet struct dst_entry *dst; 20392d86829SDavid S. Miller bool res = false; 2041da177e4SLinus Torvalds 205c0303efeSJesper Dangaard Brouer if (icmpv6_mask_allow(type)) 20692d86829SDavid S. Miller return true; 2071da177e4SLinus Torvalds 2081da177e4SLinus Torvalds /* 2091da177e4SLinus Torvalds * Look up the output route. 2101da177e4SLinus Torvalds * XXX: perhaps the expire for routing entries cloned by 2111da177e4SLinus Torvalds * this lookup should be more aggressive (not longer than timeout). 2121da177e4SLinus Torvalds */ 2134c9483b2SDavid S. Miller dst = ip6_route_output(net, sk, fl6); 2141da177e4SLinus Torvalds if (dst->error) { 2153bd653c8SDenis V. Lunev IP6_INC_STATS(net, ip6_dst_idev(dst), 216a11d206dSYOSHIFUJI Hideaki IPSTATS_MIB_OUTNOROUTES); 2171da177e4SLinus Torvalds } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { 21892d86829SDavid S. Miller res = true; 2191da177e4SLinus Torvalds } else { 2201da177e4SLinus Torvalds struct rt6_info *rt = (struct rt6_info *)dst; 2219a43b709SBenjamin Thery int tmo = net->ipv6.sysctl.icmpv6_time; 222c0303efeSJesper Dangaard Brouer struct inet_peer *peer; 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvalds /* Give more bandwidth to wider prefixes. */ 2251da177e4SLinus Torvalds if (rt->rt6i_dst.plen < 128) 2261da177e4SLinus Torvalds tmo >>= ((128 - rt->rt6i_dst.plen)>>5); 2271da177e4SLinus Torvalds 228c0303efeSJesper Dangaard Brouer peer = inet_getpeer_v6(net->ipv6.peers, &fl6->daddr, 1); 229fbfe95a4SDavid S. Miller res = inet_peer_xrlim_allow(peer, tmo); 2301d861aa4SDavid S. Miller if (peer) 2311d861aa4SDavid S. Miller inet_putpeer(peer); 2321da177e4SLinus Torvalds } 2331da177e4SLinus Torvalds dst_release(dst); 2341da177e4SLinus Torvalds return res; 2351da177e4SLinus Torvalds } 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds /* 2381da177e4SLinus Torvalds * an inline helper for the "simple" if statement below 2391da177e4SLinus Torvalds * checks if parameter problem report is caused by an 2401da177e4SLinus Torvalds * unrecognized IPv6 option that has the Option Type 2411da177e4SLinus Torvalds * highest-order two bits set to 10 2421da177e4SLinus Torvalds */ 2431da177e4SLinus Torvalds 244a50feda5SEric Dumazet static bool opt_unrec(struct sk_buff *skb, __u32 offset) 2451da177e4SLinus Torvalds { 2461da177e4SLinus Torvalds u8 _optval, *op; 2471da177e4SLinus Torvalds 248bbe735e4SArnaldo Carvalho de Melo offset += skb_network_offset(skb); 2491da177e4SLinus Torvalds op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); 25063159f29SIan Morris if (!op) 251a50feda5SEric Dumazet return true; 2521da177e4SLinus Torvalds return (*op & 0xC0) == 0x80; 2531da177e4SLinus Torvalds } 2541da177e4SLinus Torvalds 2556d0bfe22SLorenzo Colitti int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 2566d0bfe22SLorenzo Colitti struct icmp6hdr *thdr, int len) 2571da177e4SLinus Torvalds { 2581da177e4SLinus Torvalds struct sk_buff *skb; 2591da177e4SLinus Torvalds struct icmp6hdr *icmp6h; 2601da177e4SLinus Torvalds int err = 0; 2611da177e4SLinus Torvalds 262e5d08d71SIan Morris skb = skb_peek(&sk->sk_write_queue); 26363159f29SIan Morris if (!skb) 2641da177e4SLinus Torvalds goto out; 2651da177e4SLinus Torvalds 266cc70ab26SArnaldo Carvalho de Melo icmp6h = icmp6_hdr(skb); 2671da177e4SLinus Torvalds memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); 2681da177e4SLinus Torvalds icmp6h->icmp6_cksum = 0; 2691da177e4SLinus Torvalds 2701da177e4SLinus Torvalds if (skb_queue_len(&sk->sk_write_queue) == 1) { 27107f0757aSJoe Perches skb->csum = csum_partial(icmp6h, 2721da177e4SLinus Torvalds sizeof(struct icmp6hdr), skb->csum); 2734c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2744c9483b2SDavid S. Miller &fl6->daddr, 2754c9483b2SDavid S. Miller len, fl6->flowi6_proto, 2761da177e4SLinus Torvalds skb->csum); 2771da177e4SLinus Torvalds } else { 278868c86bcSAl Viro __wsum tmp_csum = 0; 2791da177e4SLinus Torvalds 2801da177e4SLinus Torvalds skb_queue_walk(&sk->sk_write_queue, skb) { 2811da177e4SLinus Torvalds tmp_csum = csum_add(tmp_csum, skb->csum); 2821da177e4SLinus Torvalds } 2831da177e4SLinus Torvalds 28407f0757aSJoe Perches tmp_csum = csum_partial(icmp6h, 2851da177e4SLinus Torvalds sizeof(struct icmp6hdr), tmp_csum); 2864c9483b2SDavid S. Miller icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, 2874c9483b2SDavid S. Miller &fl6->daddr, 2884c9483b2SDavid S. Miller len, fl6->flowi6_proto, 289868c86bcSAl Viro tmp_csum); 2901da177e4SLinus Torvalds } 2911da177e4SLinus Torvalds ip6_push_pending_frames(sk); 2921da177e4SLinus Torvalds out: 2931da177e4SLinus Torvalds return err; 2941da177e4SLinus Torvalds } 2951da177e4SLinus Torvalds 2961da177e4SLinus Torvalds struct icmpv6_msg { 2971da177e4SLinus Torvalds struct sk_buff *skb; 2981da177e4SLinus Torvalds int offset; 299763ecff1SYasuyuki Kozakai uint8_t type; 3001da177e4SLinus Torvalds }; 3011da177e4SLinus Torvalds 3021da177e4SLinus Torvalds static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) 3031da177e4SLinus Torvalds { 3041da177e4SLinus Torvalds struct icmpv6_msg *msg = (struct icmpv6_msg *) from; 3051da177e4SLinus Torvalds struct sk_buff *org_skb = msg->skb; 3065f92a738SAl Viro __wsum csum = 0; 3071da177e4SLinus Torvalds 3081da177e4SLinus Torvalds csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, 3091da177e4SLinus Torvalds to, len, csum); 3101da177e4SLinus Torvalds skb->csum = csum_block_add(skb->csum, csum, odd); 311763ecff1SYasuyuki Kozakai if (!(msg->type & ICMPV6_INFOMSG_MASK)) 312763ecff1SYasuyuki Kozakai nf_ct_attach(skb, org_skb); 3131da177e4SLinus Torvalds return 0; 3141da177e4SLinus Torvalds } 3151da177e4SLinus Torvalds 31607a93626SAmerigo Wang #if IS_ENABLED(CONFIG_IPV6_MIP6) 31779383236SMasahide NAKAMURA static void mip6_addr_swap(struct sk_buff *skb) 31879383236SMasahide NAKAMURA { 3190660e03fSArnaldo Carvalho de Melo struct ipv6hdr *iph = ipv6_hdr(skb); 32079383236SMasahide NAKAMURA struct inet6_skb_parm *opt = IP6CB(skb); 32179383236SMasahide NAKAMURA struct ipv6_destopt_hao *hao; 32279383236SMasahide NAKAMURA struct in6_addr tmp; 32379383236SMasahide NAKAMURA int off; 32479383236SMasahide NAKAMURA 32579383236SMasahide NAKAMURA if (opt->dsthao) { 32679383236SMasahide NAKAMURA off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); 32779383236SMasahide NAKAMURA if (likely(off >= 0)) { 328d56f90a7SArnaldo Carvalho de Melo hao = (struct ipv6_destopt_hao *) 329d56f90a7SArnaldo Carvalho de Melo (skb_network_header(skb) + off); 3304e3fd7a0SAlexey Dobriyan tmp = iph->saddr; 3314e3fd7a0SAlexey Dobriyan iph->saddr = hao->addr; 3324e3fd7a0SAlexey Dobriyan hao->addr = tmp; 33379383236SMasahide NAKAMURA } 33479383236SMasahide NAKAMURA } 33579383236SMasahide NAKAMURA } 33679383236SMasahide NAKAMURA #else 33779383236SMasahide NAKAMURA static inline void mip6_addr_swap(struct sk_buff *skb) {} 33879383236SMasahide NAKAMURA #endif 33979383236SMasahide NAKAMURA 340e8243534Sstephen hemminger static struct dst_entry *icmpv6_route_lookup(struct net *net, 341e8243534Sstephen hemminger struct sk_buff *skb, 342e8243534Sstephen hemminger struct sock *sk, 343e8243534Sstephen hemminger struct flowi6 *fl6) 344b42835dbSDavid S. Miller { 345b42835dbSDavid S. Miller struct dst_entry *dst, *dst2; 3464c9483b2SDavid S. Miller struct flowi6 fl2; 347b42835dbSDavid S. Miller int err; 348b42835dbSDavid S. Miller 349343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst, fl6); 350b42835dbSDavid S. Miller if (err) 351b42835dbSDavid S. Miller return ERR_PTR(err); 352b42835dbSDavid S. Miller 353b42835dbSDavid S. Miller /* 354b42835dbSDavid S. Miller * We won't send icmp if the destination is known 355b42835dbSDavid S. Miller * anycast. 356b42835dbSDavid S. Miller */ 3572647a9b0SMartin KaFai Lau if (ipv6_anycast_destination(dst, &fl6->daddr)) { 358ba7a46f1SJoe Perches net_dbg_ratelimited("icmp6_send: acast source\n"); 359b42835dbSDavid S. Miller dst_release(dst); 360b42835dbSDavid S. Miller return ERR_PTR(-EINVAL); 361b42835dbSDavid S. Miller } 362b42835dbSDavid S. Miller 363b42835dbSDavid S. Miller /* No need to clone since we're just using its address. */ 364b42835dbSDavid S. Miller dst2 = dst; 365b42835dbSDavid S. Miller 3664c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); 367452edd59SDavid S. Miller if (!IS_ERR(dst)) { 368b42835dbSDavid S. Miller if (dst != dst2) 369b42835dbSDavid S. Miller return dst; 370452edd59SDavid S. Miller } else { 371452edd59SDavid S. Miller if (PTR_ERR(dst) == -EPERM) 372b42835dbSDavid S. Miller dst = NULL; 373452edd59SDavid S. Miller else 374452edd59SDavid S. Miller return dst; 375b42835dbSDavid S. Miller } 376b42835dbSDavid S. Miller 3774c9483b2SDavid S. Miller err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); 378b42835dbSDavid S. Miller if (err) 379b42835dbSDavid S. Miller goto relookup_failed; 380b42835dbSDavid S. Miller 381343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst2, &fl2); 382b42835dbSDavid S. Miller if (err) 383b42835dbSDavid S. Miller goto relookup_failed; 384b42835dbSDavid S. Miller 3854c9483b2SDavid S. Miller dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); 386452edd59SDavid S. Miller if (!IS_ERR(dst2)) { 387b42835dbSDavid S. Miller dst_release(dst); 388b42835dbSDavid S. Miller dst = dst2; 389452edd59SDavid S. Miller } else { 390452edd59SDavid S. Miller err = PTR_ERR(dst2); 391452edd59SDavid S. Miller if (err == -EPERM) { 392b42835dbSDavid S. Miller dst_release(dst); 393452edd59SDavid S. Miller return dst2; 394452edd59SDavid S. Miller } else 395b42835dbSDavid S. Miller goto relookup_failed; 396b42835dbSDavid S. Miller } 397b42835dbSDavid S. Miller 398b42835dbSDavid S. Miller relookup_failed: 399b42835dbSDavid S. Miller if (dst) 400b42835dbSDavid S. Miller return dst; 401b42835dbSDavid S. Miller return ERR_PTR(err); 402b42835dbSDavid S. Miller } 403b42835dbSDavid S. Miller 4041da177e4SLinus Torvalds /* 4051da177e4SLinus Torvalds * Send an ICMP message in response to a packet in error 4061da177e4SLinus Torvalds */ 407b1cadc1aSEric Dumazet static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info, 408b1cadc1aSEric Dumazet const struct in6_addr *force_saddr) 4091da177e4SLinus Torvalds { 410c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 4111da177e4SLinus Torvalds struct inet6_dev *idev = NULL; 4120660e03fSArnaldo Carvalho de Melo struct ipv6hdr *hdr = ipv6_hdr(skb); 41384427d53SYOSHIFUJI Hideaki struct sock *sk; 41484427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 415b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 4161da177e4SLinus Torvalds struct dst_entry *dst; 4171da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 4184c9483b2SDavid S. Miller struct flowi6 fl6; 4191da177e4SLinus Torvalds struct icmpv6_msg msg; 420c14ac945SSoheil Hassas Yeganeh struct sockcm_cookie sockc_unused = {0}; 42126879da5SWei Wang struct ipcm6_cookie ipc6; 4221da177e4SLinus Torvalds int iif = 0; 4231da177e4SLinus Torvalds int addr_type = 0; 4241da177e4SLinus Torvalds int len; 4251da177e4SLinus Torvalds int err = 0; 426e110861fSLorenzo Colitti u32 mark = IP6_REPLY_MARK(net, skb->mark); 4271da177e4SLinus Torvalds 42827a884dcSArnaldo Carvalho de Melo if ((u8 *)hdr < skb->head || 42929a3cad5SSimon Horman (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb)) 4301da177e4SLinus Torvalds return; 4311da177e4SLinus Torvalds 4321da177e4SLinus Torvalds /* 4331da177e4SLinus Torvalds * Make sure we respect the rules 4341da177e4SLinus Torvalds * i.e. RFC 1885 2.4(e) 4355f5624cfSPravin B Shelar * Rule (e.1) is enforced by not using icmp6_send 4361da177e4SLinus Torvalds * in any code that processes icmp errors. 4371da177e4SLinus Torvalds */ 4381da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->daddr); 4391da177e4SLinus Torvalds 440446fab59SFX Le Bail if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) || 441d94c1f92SFX Le Bail ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr)) 4421da177e4SLinus Torvalds saddr = &hdr->daddr; 4431da177e4SLinus Torvalds 4441da177e4SLinus Torvalds /* 4451da177e4SLinus Torvalds * Dest addr check 4461da177e4SLinus Torvalds */ 4471da177e4SLinus Torvalds 4489a6b4b39Szhuyj if (addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST) { 4491da177e4SLinus Torvalds if (type != ICMPV6_PKT_TOOBIG && 4501da177e4SLinus Torvalds !(type == ICMPV6_PARAMPROB && 4511da177e4SLinus Torvalds code == ICMPV6_UNK_OPTION && 4521da177e4SLinus Torvalds (opt_unrec(skb, info)))) 4531da177e4SLinus Torvalds return; 4541da177e4SLinus Torvalds 4551da177e4SLinus Torvalds saddr = NULL; 4561da177e4SLinus Torvalds } 4571da177e4SLinus Torvalds 4581da177e4SLinus Torvalds addr_type = ipv6_addr_type(&hdr->saddr); 4591da177e4SLinus Torvalds 4601da177e4SLinus Torvalds /* 4611da177e4SLinus Torvalds * Source addr check 4621da177e4SLinus Torvalds */ 4631da177e4SLinus Torvalds 464842df073SHannes Frederic Sowa if (__ipv6_addr_needs_scope_id(addr_type)) 4651da177e4SLinus Torvalds iif = skb->dev->ifindex; 46679dc7e3fSDavid Ahern else { 46779dc7e3fSDavid Ahern dst = skb_dst(skb); 46879dc7e3fSDavid Ahern iif = l3mdev_master_ifindex(dst ? dst->dev : skb->dev); 46979dc7e3fSDavid Ahern } 4701da177e4SLinus Torvalds 4711da177e4SLinus Torvalds /* 4728de3351eSYOSHIFUJI Hideaki * Must not send error if the source does not uniquely 4738de3351eSYOSHIFUJI Hideaki * identify a single node (RFC2463 Section 2.4). 4748de3351eSYOSHIFUJI Hideaki * We check unspecified / multicast addresses here, 4758de3351eSYOSHIFUJI Hideaki * and anycast addresses will be checked later. 4761da177e4SLinus Torvalds */ 4771da177e4SLinus Torvalds if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { 4784b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: addr_any/mcast source [%pI6c > %pI6c]\n", 4794b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 4801da177e4SLinus Torvalds return; 4811da177e4SLinus Torvalds } 4821da177e4SLinus Torvalds 4831da177e4SLinus Torvalds /* 4841da177e4SLinus Torvalds * Never answer to a ICMP packet. 4851da177e4SLinus Torvalds */ 4861da177e4SLinus Torvalds if (is_ineligible(skb)) { 4874b3418fbSBjørn Mork net_dbg_ratelimited("icmp6_send: no reply to icmp error [%pI6c > %pI6c]\n", 4884b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 4891da177e4SLinus Torvalds return; 4901da177e4SLinus Torvalds } 4911da177e4SLinus Torvalds 49279383236SMasahide NAKAMURA mip6_addr_swap(skb); 49379383236SMasahide NAKAMURA 4944c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 4954c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 4964e3fd7a0SAlexey Dobriyan fl6.daddr = hdr->saddr; 497b1cadc1aSEric Dumazet if (force_saddr) 498b1cadc1aSEric Dumazet saddr = force_saddr; 4991da177e4SLinus Torvalds if (saddr) 5004e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 501e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 5024c9483b2SDavid S. Miller fl6.flowi6_oif = iif; 5031958b856SDavid S. Miller fl6.fl6_icmp_type = type; 5041958b856SDavid S. Miller fl6.fl6_icmp_code = code; 505e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 5064c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 5071da177e4SLinus Torvalds 508fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 50963159f29SIan Morris if (!sk) 510405666dbSDenis V. Lunev return; 511c0303efeSJesper Dangaard Brouer 512c0303efeSJesper Dangaard Brouer if (!icmpv6_global_allow(type)) 513c0303efeSJesper Dangaard Brouer goto out; 514c0303efeSJesper Dangaard Brouer 515e110861fSLorenzo Colitti sk->sk_mark = mark; 516fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 517405666dbSDenis V. Lunev 5184c9483b2SDavid S. Miller if (!icmpv6_xrlim_allow(sk, type, &fl6)) 5191da177e4SLinus Torvalds goto out; 5201da177e4SLinus Torvalds 5211da177e4SLinus Torvalds tmp_hdr.icmp6_type = type; 5221da177e4SLinus Torvalds tmp_hdr.icmp6_code = code; 5231da177e4SLinus Torvalds tmp_hdr.icmp6_cksum = 0; 5241da177e4SLinus Torvalds tmp_hdr.icmp6_pointer = htonl(info); 5251da177e4SLinus Torvalds 5264c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 5274c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 528c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 529c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 5301da177e4SLinus Torvalds 53138b7097bSHannes Frederic Sowa ipc6.tclass = np->tclass; 53238b7097bSHannes Frederic Sowa fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 53338b7097bSHannes Frederic Sowa 5344c9483b2SDavid S. Miller dst = icmpv6_route_lookup(net, skb, sk, &fl6); 535b42835dbSDavid S. Miller if (IS_ERR(dst)) 5361da177e4SLinus Torvalds goto out; 5378de3351eSYOSHIFUJI Hideaki 53826879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 53926879da5SWei Wang ipc6.dontfrag = np->dontfrag; 54026879da5SWei Wang ipc6.opt = NULL; 5411da177e4SLinus Torvalds 5421da177e4SLinus Torvalds msg.skb = skb; 543bbe735e4SArnaldo Carvalho de Melo msg.offset = skb_network_offset(skb); 544763ecff1SYasuyuki Kozakai msg.type = type; 5451da177e4SLinus Torvalds 5461da177e4SLinus Torvalds len = skb->len - msg.offset; 5471da177e4SLinus Torvalds len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(struct icmp6hdr)); 5481da177e4SLinus Torvalds if (len < 0) { 5494b3418fbSBjørn Mork net_dbg_ratelimited("icmp: len problem [%pI6c > %pI6c]\n", 5504b3418fbSBjørn Mork &hdr->saddr, &hdr->daddr); 5511da177e4SLinus Torvalds goto out_dst_release; 5521da177e4SLinus Torvalds } 5531da177e4SLinus Torvalds 554cfdf7647SEric Dumazet rcu_read_lock(); 555cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 5561da177e4SLinus Torvalds 5571da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, 5581da177e4SLinus Torvalds len + sizeof(struct icmp6hdr), 55926879da5SWei Wang sizeof(struct icmp6hdr), 56026879da5SWei Wang &ipc6, &fl6, (struct rt6_info *)dst, 56126879da5SWei Wang MSG_DONTWAIT, &sockc_unused); 5621da177e4SLinus Torvalds if (err) { 56343a43b60SHannes Frederic Sowa ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 5641da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 565cfdf7647SEric Dumazet } else { 566cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 567cfdf7647SEric Dumazet len + sizeof(struct icmp6hdr)); 5681da177e4SLinus Torvalds } 569cfdf7647SEric Dumazet rcu_read_unlock(); 5701da177e4SLinus Torvalds out_dst_release: 5711da177e4SLinus Torvalds dst_release(dst); 5721da177e4SLinus Torvalds out: 573405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 5741da177e4SLinus Torvalds } 5755f5624cfSPravin B Shelar 5765f5624cfSPravin B Shelar /* Slightly more convenient version of icmp6_send. 5775f5624cfSPravin B Shelar */ 5785f5624cfSPravin B Shelar void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) 5795f5624cfSPravin B Shelar { 580b1cadc1aSEric Dumazet icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL); 5815f5624cfSPravin B Shelar kfree_skb(skb); 5825f5624cfSPravin B Shelar } 5837159039aSYOSHIFUJI Hideaki 5845fbba8acSEric Dumazet /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH 5855fbba8acSEric Dumazet * if sufficient data bytes are available 5865fbba8acSEric Dumazet * @nhs is the size of the tunnel header(s) : 5875fbba8acSEric Dumazet * Either an IPv4 header for SIT encap 5885fbba8acSEric Dumazet * an IPv4 header + GRE header for GRE encap 5895fbba8acSEric Dumazet */ 59020e1954fSEric Dumazet int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type, 59120e1954fSEric Dumazet unsigned int data_len) 5925fbba8acSEric Dumazet { 5932d7a3b27SEric Dumazet struct in6_addr temp_saddr; 5945fbba8acSEric Dumazet struct rt6_info *rt; 5955fbba8acSEric Dumazet struct sk_buff *skb2; 59620e1954fSEric Dumazet u32 info = 0; 5975fbba8acSEric Dumazet 5985fbba8acSEric Dumazet if (!pskb_may_pull(skb, nhs + sizeof(struct ipv6hdr) + 8)) 5995fbba8acSEric Dumazet return 1; 6005fbba8acSEric Dumazet 60120e1954fSEric Dumazet /* RFC 4884 (partial) support for ICMP extensions */ 60220e1954fSEric Dumazet if (data_len < 128 || (data_len & 7) || skb->len < data_len) 60320e1954fSEric Dumazet data_len = 0; 60420e1954fSEric Dumazet 60520e1954fSEric Dumazet skb2 = data_len ? skb_copy(skb, GFP_ATOMIC) : skb_clone(skb, GFP_ATOMIC); 6065fbba8acSEric Dumazet 6075fbba8acSEric Dumazet if (!skb2) 6085fbba8acSEric Dumazet return 1; 6095fbba8acSEric Dumazet 6105fbba8acSEric Dumazet skb_dst_drop(skb2); 6115fbba8acSEric Dumazet skb_pull(skb2, nhs); 6125fbba8acSEric Dumazet skb_reset_network_header(skb2); 6135fbba8acSEric Dumazet 6145fbba8acSEric Dumazet rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 0); 6155fbba8acSEric Dumazet 6165fbba8acSEric Dumazet if (rt && rt->dst.dev) 6175fbba8acSEric Dumazet skb2->dev = rt->dst.dev; 6185fbba8acSEric Dumazet 6192d7a3b27SEric Dumazet ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr); 62020e1954fSEric Dumazet 62120e1954fSEric Dumazet if (data_len) { 62220e1954fSEric Dumazet /* RFC 4884 (partial) support : 62320e1954fSEric Dumazet * insert 0 padding at the end, before the extensions 62420e1954fSEric Dumazet */ 62520e1954fSEric Dumazet __skb_push(skb2, nhs); 62620e1954fSEric Dumazet skb_reset_network_header(skb2); 62720e1954fSEric Dumazet memmove(skb2->data, skb2->data + nhs, data_len - nhs); 62820e1954fSEric Dumazet memset(skb2->data + data_len - nhs, 0, nhs); 62920e1954fSEric Dumazet /* RFC 4884 4.5 : Length is measured in 64-bit words, 63020e1954fSEric Dumazet * and stored in reserved[0] 63120e1954fSEric Dumazet */ 63220e1954fSEric Dumazet info = (data_len/8) << 24; 63320e1954fSEric Dumazet } 6342d7a3b27SEric Dumazet if (type == ICMP_TIME_EXCEEDED) 6352d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 63620e1954fSEric Dumazet info, &temp_saddr); 6372d7a3b27SEric Dumazet else 6382d7a3b27SEric Dumazet icmp6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 63920e1954fSEric Dumazet info, &temp_saddr); 6405fbba8acSEric Dumazet if (rt) 6415fbba8acSEric Dumazet ip6_rt_put(rt); 6425fbba8acSEric Dumazet 6435fbba8acSEric Dumazet kfree_skb(skb2); 6445fbba8acSEric Dumazet 6455fbba8acSEric Dumazet return 0; 6465fbba8acSEric Dumazet } 6475fbba8acSEric Dumazet EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach); 6485fbba8acSEric Dumazet 6491da177e4SLinus Torvalds static void icmpv6_echo_reply(struct sk_buff *skb) 6501da177e4SLinus Torvalds { 651c346dca1SYOSHIFUJI Hideaki struct net *net = dev_net(skb->dev); 65284427d53SYOSHIFUJI Hideaki struct sock *sk; 6531da177e4SLinus Torvalds struct inet6_dev *idev; 65484427d53SYOSHIFUJI Hideaki struct ipv6_pinfo *np; 655b71d1d42SEric Dumazet const struct in6_addr *saddr = NULL; 656cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 6571da177e4SLinus Torvalds struct icmp6hdr tmp_hdr; 6584c9483b2SDavid S. Miller struct flowi6 fl6; 6591da177e4SLinus Torvalds struct icmpv6_msg msg; 6601da177e4SLinus Torvalds struct dst_entry *dst; 66126879da5SWei Wang struct ipcm6_cookie ipc6; 6621da177e4SLinus Torvalds int err = 0; 663e110861fSLorenzo Colitti u32 mark = IP6_REPLY_MARK(net, skb->mark); 664c14ac945SSoheil Hassas Yeganeh struct sockcm_cookie sockc_unused = {0}; 6651da177e4SLinus Torvalds 6660660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->daddr; 6671da177e4SLinus Torvalds 668509aba3bSFX Le Bail if (!ipv6_unicast_destination(skb) && 669ec35b61eSFX Le Bail !(net->ipv6.sysctl.anycast_src_echo_reply && 6702647a9b0SMartin KaFai Lau ipv6_anycast_destination(skb_dst(skb), saddr))) 6711da177e4SLinus Torvalds saddr = NULL; 6721da177e4SLinus Torvalds 6731da177e4SLinus Torvalds memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); 6741da177e4SLinus Torvalds tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; 6751da177e4SLinus Torvalds 6764c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 6774c9483b2SDavid S. Miller fl6.flowi6_proto = IPPROTO_ICMPV6; 6784e3fd7a0SAlexey Dobriyan fl6.daddr = ipv6_hdr(skb)->saddr; 6791da177e4SLinus Torvalds if (saddr) 6804e3fd7a0SAlexey Dobriyan fl6.saddr = *saddr; 6819ff74384SDavid Ahern fl6.flowi6_oif = skb->dev->ifindex; 6821958b856SDavid S. Miller fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; 683e110861fSLorenzo Colitti fl6.flowi6_mark = mark; 684e2d118a1SLorenzo Colitti fl6.flowi6_uid = sock_net_uid(net, NULL); 6854c9483b2SDavid S. Miller security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); 6861da177e4SLinus Torvalds 687fdc0bde9SDenis V. Lunev sk = icmpv6_xmit_lock(net); 68863159f29SIan Morris if (!sk) 689405666dbSDenis V. Lunev return; 690e110861fSLorenzo Colitti sk->sk_mark = mark; 691fdc0bde9SDenis V. Lunev np = inet6_sk(sk); 692405666dbSDenis V. Lunev 6934c9483b2SDavid S. Miller if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 6944c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 695c4062dfcSErich E. Hoover else if (!fl6.flowi6_oif) 696c4062dfcSErich E. Hoover fl6.flowi6_oif = np->ucast_oif; 6971da177e4SLinus Torvalds 698343d60aaSRoopa Prabhu err = ip6_dst_lookup(net, sk, &dst, &fl6); 6991da177e4SLinus Torvalds if (err) 7001da177e4SLinus Torvalds goto out; 7014c9483b2SDavid S. Miller dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); 702452edd59SDavid S. Miller if (IS_ERR(dst)) 703e104411bSPatrick McHardy goto out; 7041da177e4SLinus Torvalds 705cfdf7647SEric Dumazet idev = __in6_dev_get(skb->dev); 7061da177e4SLinus Torvalds 7071da177e4SLinus Torvalds msg.skb = skb; 7081da177e4SLinus Torvalds msg.offset = 0; 709763ecff1SYasuyuki Kozakai msg.type = ICMPV6_ECHO_REPLY; 7101da177e4SLinus Torvalds 71126879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 71226879da5SWei Wang ipc6.tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 71326879da5SWei Wang ipc6.dontfrag = np->dontfrag; 71426879da5SWei Wang ipc6.opt = NULL; 71526879da5SWei Wang 7161da177e4SLinus Torvalds err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), 71726879da5SWei Wang sizeof(struct icmp6hdr), &ipc6, &fl6, 71813b52cd4SBrian Haley (struct rt6_info *)dst, MSG_DONTWAIT, 71926879da5SWei Wang &sockc_unused); 7201da177e4SLinus Torvalds 7211da177e4SLinus Torvalds if (err) { 722a16292a0SEric Dumazet __ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS); 7231da177e4SLinus Torvalds ip6_flush_pending_frames(sk); 724cfdf7647SEric Dumazet } else { 725cfdf7647SEric Dumazet err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, 726cfdf7647SEric Dumazet skb->len + sizeof(struct icmp6hdr)); 7271da177e4SLinus Torvalds } 7281da177e4SLinus Torvalds dst_release(dst); 7291da177e4SLinus Torvalds out: 730405666dbSDenis V. Lunev icmpv6_xmit_unlock(sk); 7311da177e4SLinus Torvalds } 7321da177e4SLinus Torvalds 733b94f1c09SDavid S. Miller void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) 7341da177e4SLinus Torvalds { 73541135cc8SAlexey Dobriyan const struct inet6_protocol *ipprot; 7361da177e4SLinus Torvalds int inner_offset; 73775f2811cSJesse Gross __be16 frag_off; 738f9242b6bSDavid S. Miller u8 nexthdr; 7397304fe46SDuan Jiong struct net *net = dev_net(skb->dev); 7401da177e4SLinus Torvalds 7411da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 7427304fe46SDuan Jiong goto out; 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; 7451da177e4SLinus Torvalds if (ipv6_ext_hdr(nexthdr)) { 7461da177e4SLinus Torvalds /* now skip over extension headers */ 74775f2811cSJesse Gross inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), 74875f2811cSJesse Gross &nexthdr, &frag_off); 7491da177e4SLinus Torvalds if (inner_offset < 0) 7507304fe46SDuan Jiong goto out; 7511da177e4SLinus Torvalds } else { 7521da177e4SLinus Torvalds inner_offset = sizeof(struct ipv6hdr); 7531da177e4SLinus Torvalds } 7541da177e4SLinus Torvalds 7551da177e4SLinus Torvalds /* Checkin header including 8 bytes of inner protocol header. */ 7561da177e4SLinus Torvalds if (!pskb_may_pull(skb, inner_offset+8)) 7577304fe46SDuan Jiong goto out; 7581da177e4SLinus Torvalds 7591da177e4SLinus Torvalds /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. 7601da177e4SLinus Torvalds Without this we will not able f.e. to make source routed 7611da177e4SLinus Torvalds pmtu discovery. 7621da177e4SLinus Torvalds Corresponding argument (opt) to notifiers is already added. 7631da177e4SLinus Torvalds --ANK (980726) 7641da177e4SLinus Torvalds */ 7651da177e4SLinus Torvalds 766f9242b6bSDavid S. Miller ipprot = rcu_dereference(inet6_protos[nexthdr]); 7671da177e4SLinus Torvalds if (ipprot && ipprot->err_handler) 7681da177e4SLinus Torvalds ipprot->err_handler(skb, NULL, type, code, inner_offset, info); 7691da177e4SLinus Torvalds 77069d6da0bSPavel Emelyanov raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); 7717304fe46SDuan Jiong return; 7727304fe46SDuan Jiong 7737304fe46SDuan Jiong out: 774a16292a0SEric Dumazet __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); 7751da177e4SLinus Torvalds } 7761da177e4SLinus Torvalds 7771da177e4SLinus Torvalds /* 7781da177e4SLinus Torvalds * Handle icmp messages 7791da177e4SLinus Torvalds */ 7801da177e4SLinus Torvalds 781e5bbef20SHerbert Xu static int icmpv6_rcv(struct sk_buff *skb) 7821da177e4SLinus Torvalds { 7831da177e4SLinus Torvalds struct net_device *dev = skb->dev; 7841da177e4SLinus Torvalds struct inet6_dev *idev = __in6_dev_get(dev); 785b71d1d42SEric Dumazet const struct in6_addr *saddr, *daddr; 7861da177e4SLinus Torvalds struct icmp6hdr *hdr; 787d5fdd6baSBrian Haley u8 type; 788e3e32170SRick Jones bool success = false; 7891da177e4SLinus Torvalds 790aebcf82cSHerbert Xu if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 791def8b4faSAlexey Dobriyan struct sec_path *sp = skb_sec_path(skb); 7928b7817f3SHerbert Xu int nh; 7938b7817f3SHerbert Xu 794def8b4faSAlexey Dobriyan if (!(sp && sp->xvec[sp->len - 1]->props.flags & 795aebcf82cSHerbert Xu XFRM_STATE_ICMP)) 796aebcf82cSHerbert Xu goto drop_no_count; 797aebcf82cSHerbert Xu 79881aded24SDavid S. Miller if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) 7998b7817f3SHerbert Xu goto drop_no_count; 8008b7817f3SHerbert Xu 8018b7817f3SHerbert Xu nh = skb_network_offset(skb); 8028b7817f3SHerbert Xu skb_set_network_header(skb, sizeof(*hdr)); 8038b7817f3SHerbert Xu 8048b7817f3SHerbert Xu if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) 8058b7817f3SHerbert Xu goto drop_no_count; 8068b7817f3SHerbert Xu 8078b7817f3SHerbert Xu skb_set_network_header(skb, nh); 8088b7817f3SHerbert Xu } 8098b7817f3SHerbert Xu 810a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INMSGS); 8111da177e4SLinus Torvalds 8120660e03fSArnaldo Carvalho de Melo saddr = &ipv6_hdr(skb)->saddr; 8130660e03fSArnaldo Carvalho de Melo daddr = &ipv6_hdr(skb)->daddr; 8141da177e4SLinus Torvalds 81539471ac8STom Herbert if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) { 816ba7a46f1SJoe Perches net_dbg_ratelimited("ICMPv6 checksum failed [%pI6c > %pI6c]\n", 8170c6ce78aSHarvey Harrison saddr, daddr); 8186a5dc9e5SEric Dumazet goto csum_error; 8191da177e4SLinus Torvalds } 8201da177e4SLinus Torvalds 8218cf22943SHerbert Xu if (!pskb_pull(skb, sizeof(*hdr))) 8228cf22943SHerbert Xu goto discard_it; 8231da177e4SLinus Torvalds 824cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 8251da177e4SLinus Torvalds 8261da177e4SLinus Torvalds type = hdr->icmp6_type; 8271da177e4SLinus Torvalds 828f3832ed2SEric Dumazet ICMP6MSGIN_INC_STATS(dev_net(dev), idev, type); 8291da177e4SLinus Torvalds 8301da177e4SLinus Torvalds switch (type) { 8311da177e4SLinus Torvalds case ICMPV6_ECHO_REQUEST: 8321da177e4SLinus Torvalds icmpv6_echo_reply(skb); 8331da177e4SLinus Torvalds break; 8341da177e4SLinus Torvalds 8351da177e4SLinus Torvalds case ICMPV6_ECHO_REPLY: 836e3e32170SRick Jones success = ping_rcv(skb); 8371da177e4SLinus Torvalds break; 8381da177e4SLinus Torvalds 8391da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 8401da177e4SLinus Torvalds /* BUGGG_FUTURE: if packet contains rthdr, we cannot update 8411da177e4SLinus Torvalds standard destination cache. Seems, only "advanced" 8421da177e4SLinus Torvalds destination cache will allow to solve this problem 8431da177e4SLinus Torvalds --ANK (980726) 8441da177e4SLinus Torvalds */ 8451da177e4SLinus Torvalds if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 8461da177e4SLinus Torvalds goto discard_it; 847cc70ab26SArnaldo Carvalho de Melo hdr = icmp6_hdr(skb); 8481da177e4SLinus Torvalds 8491da177e4SLinus Torvalds /* 8501da177e4SLinus Torvalds * Drop through to notify 8511da177e4SLinus Torvalds */ 8521da177e4SLinus Torvalds 8531da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 8541da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 8551da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 8561da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 8571da177e4SLinus Torvalds break; 8581da177e4SLinus Torvalds 8591da177e4SLinus Torvalds case NDISC_ROUTER_SOLICITATION: 8601da177e4SLinus Torvalds case NDISC_ROUTER_ADVERTISEMENT: 8611da177e4SLinus Torvalds case NDISC_NEIGHBOUR_SOLICITATION: 8621da177e4SLinus Torvalds case NDISC_NEIGHBOUR_ADVERTISEMENT: 8631da177e4SLinus Torvalds case NDISC_REDIRECT: 8641da177e4SLinus Torvalds ndisc_rcv(skb); 8651da177e4SLinus Torvalds break; 8661da177e4SLinus Torvalds 8671da177e4SLinus Torvalds case ICMPV6_MGM_QUERY: 8681da177e4SLinus Torvalds igmp6_event_query(skb); 8691da177e4SLinus Torvalds break; 8701da177e4SLinus Torvalds 8711da177e4SLinus Torvalds case ICMPV6_MGM_REPORT: 8721da177e4SLinus Torvalds igmp6_event_report(skb); 8731da177e4SLinus Torvalds break; 8741da177e4SLinus Torvalds 8751da177e4SLinus Torvalds case ICMPV6_MGM_REDUCTION: 8761da177e4SLinus Torvalds case ICMPV6_NI_QUERY: 8771da177e4SLinus Torvalds case ICMPV6_NI_REPLY: 8781da177e4SLinus Torvalds case ICMPV6_MLD2_REPORT: 8791da177e4SLinus Torvalds case ICMPV6_DHAAD_REQUEST: 8801da177e4SLinus Torvalds case ICMPV6_DHAAD_REPLY: 8811da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_SOL: 8821da177e4SLinus Torvalds case ICMPV6_MOBILE_PREFIX_ADV: 8831da177e4SLinus Torvalds break; 8841da177e4SLinus Torvalds 8851da177e4SLinus Torvalds default: 8861da177e4SLinus Torvalds /* informational */ 8871da177e4SLinus Torvalds if (type & ICMPV6_INFOMSG_MASK) 8881da177e4SLinus Torvalds break; 8891da177e4SLinus Torvalds 8904b3418fbSBjørn Mork net_dbg_ratelimited("icmpv6: msg of unknown type [%pI6c > %pI6c]\n", 8914b3418fbSBjørn Mork saddr, daddr); 892ea85a0a2SDavid S. Miller 8931da177e4SLinus Torvalds /* 8941da177e4SLinus Torvalds * error of unknown type. 8951da177e4SLinus Torvalds * must pass to upper level 8961da177e4SLinus Torvalds */ 8971da177e4SLinus Torvalds 8981da177e4SLinus Torvalds icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); 8993ff50b79SStephen Hemminger } 9003ff50b79SStephen Hemminger 901e3e32170SRick Jones /* until the v6 path can be better sorted assume failure and 902e3e32170SRick Jones * preserve the status quo behaviour for the rest of the paths to here 903e3e32170SRick Jones */ 904e3e32170SRick Jones if (success) 905e3e32170SRick Jones consume_skb(skb); 906e3e32170SRick Jones else 9071da177e4SLinus Torvalds kfree_skb(skb); 908e3e32170SRick Jones 9091da177e4SLinus Torvalds return 0; 9101da177e4SLinus Torvalds 9116a5dc9e5SEric Dumazet csum_error: 912a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); 9131da177e4SLinus Torvalds discard_it: 914a16292a0SEric Dumazet __ICMP6_INC_STATS(dev_net(dev), idev, ICMP6_MIB_INERRORS); 9158b7817f3SHerbert Xu drop_no_count: 9161da177e4SLinus Torvalds kfree_skb(skb); 9171da177e4SLinus Torvalds return 0; 9181da177e4SLinus Torvalds } 9191da177e4SLinus Torvalds 9204c9483b2SDavid S. Miller void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, 92195e41e93SYOSHIFUJI Hideaki u8 type, 92295e41e93SYOSHIFUJI Hideaki const struct in6_addr *saddr, 92395e41e93SYOSHIFUJI Hideaki const struct in6_addr *daddr, 92495e41e93SYOSHIFUJI Hideaki int oif) 92595e41e93SYOSHIFUJI Hideaki { 9264c9483b2SDavid S. Miller memset(fl6, 0, sizeof(*fl6)); 9274e3fd7a0SAlexey Dobriyan fl6->saddr = *saddr; 9284e3fd7a0SAlexey Dobriyan fl6->daddr = *daddr; 9294c9483b2SDavid S. Miller fl6->flowi6_proto = IPPROTO_ICMPV6; 9301958b856SDavid S. Miller fl6->fl6_icmp_type = type; 9311958b856SDavid S. Miller fl6->fl6_icmp_code = 0; 9324c9483b2SDavid S. Miller fl6->flowi6_oif = oif; 9334c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); 93495e41e93SYOSHIFUJI Hideaki } 93595e41e93SYOSHIFUJI Hideaki 93698c6d1b2SDenis V. Lunev static int __net_init icmpv6_sk_init(struct net *net) 9371da177e4SLinus Torvalds { 9381da177e4SLinus Torvalds struct sock *sk; 9391da177e4SLinus Torvalds int err, i, j; 9401da177e4SLinus Torvalds 94198c6d1b2SDenis V. Lunev net->ipv6.icmp_sk = 94298c6d1b2SDenis V. Lunev kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); 94363159f29SIan Morris if (!net->ipv6.icmp_sk) 94479c91159SDenis V. Lunev return -ENOMEM; 94579c91159SDenis V. Lunev 9466f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 9471ed8516fSDenis V. Lunev err = inet_ctl_sock_create(&sk, PF_INET6, 9481ed8516fSDenis V. Lunev SOCK_RAW, IPPROTO_ICMPV6, net); 9491da177e4SLinus Torvalds if (err < 0) { 950f3213831SJoe Perches pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", 9511da177e4SLinus Torvalds err); 9521da177e4SLinus Torvalds goto fail; 9531da177e4SLinus Torvalds } 9541da177e4SLinus Torvalds 9551ed8516fSDenis V. Lunev net->ipv6.icmp_sk[i] = sk; 9565c8cafd6SDenis V. Lunev 9571da177e4SLinus Torvalds /* Enough space for 2 64K ICMP packets, including 9581da177e4SLinus Torvalds * sk_buff struct overhead. 9591da177e4SLinus Torvalds */ 96087fb4b7bSEric Dumazet sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); 9611da177e4SLinus Torvalds } 9621da177e4SLinus Torvalds return 0; 9631da177e4SLinus Torvalds 9641da177e4SLinus Torvalds fail: 9655c8cafd6SDenis V. Lunev for (j = 0; j < i; j++) 9661ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); 96798c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 9681da177e4SLinus Torvalds return err; 9691da177e4SLinus Torvalds } 9701da177e4SLinus Torvalds 97198c6d1b2SDenis V. Lunev static void __net_exit icmpv6_sk_exit(struct net *net) 9721da177e4SLinus Torvalds { 9731da177e4SLinus Torvalds int i; 9741da177e4SLinus Torvalds 9756f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(i) { 9761ed8516fSDenis V. Lunev inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); 9771da177e4SLinus Torvalds } 97898c6d1b2SDenis V. Lunev kfree(net->ipv6.icmp_sk); 97998c6d1b2SDenis V. Lunev } 98098c6d1b2SDenis V. Lunev 9818ed7edceSAlexey Dobriyan static struct pernet_operations icmpv6_sk_ops = { 98298c6d1b2SDenis V. Lunev .init = icmpv6_sk_init, 98398c6d1b2SDenis V. Lunev .exit = icmpv6_sk_exit, 98498c6d1b2SDenis V. Lunev }; 98598c6d1b2SDenis V. Lunev 98698c6d1b2SDenis V. Lunev int __init icmpv6_init(void) 98798c6d1b2SDenis V. Lunev { 98898c6d1b2SDenis V. Lunev int err; 98998c6d1b2SDenis V. Lunev 99098c6d1b2SDenis V. Lunev err = register_pernet_subsys(&icmpv6_sk_ops); 99198c6d1b2SDenis V. Lunev if (err < 0) 99298c6d1b2SDenis V. Lunev return err; 99398c6d1b2SDenis V. Lunev 99498c6d1b2SDenis V. Lunev err = -EAGAIN; 99598c6d1b2SDenis V. Lunev if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) 99698c6d1b2SDenis V. Lunev goto fail; 9975f5624cfSPravin B Shelar 9985f5624cfSPravin B Shelar err = inet6_register_icmp_sender(icmp6_send); 9995f5624cfSPravin B Shelar if (err) 10005f5624cfSPravin B Shelar goto sender_reg_err; 100198c6d1b2SDenis V. Lunev return 0; 100298c6d1b2SDenis V. Lunev 10035f5624cfSPravin B Shelar sender_reg_err: 10045f5624cfSPravin B Shelar inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 100598c6d1b2SDenis V. Lunev fail: 1006f3213831SJoe Perches pr_err("Failed to register ICMP6 protocol\n"); 100798c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 100898c6d1b2SDenis V. Lunev return err; 100998c6d1b2SDenis V. Lunev } 101098c6d1b2SDenis V. Lunev 10118ed7edceSAlexey Dobriyan void icmpv6_cleanup(void) 101298c6d1b2SDenis V. Lunev { 10135f5624cfSPravin B Shelar inet6_unregister_icmp_sender(icmp6_send); 101498c6d1b2SDenis V. Lunev unregister_pernet_subsys(&icmpv6_sk_ops); 10151da177e4SLinus Torvalds inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); 10161da177e4SLinus Torvalds } 10171da177e4SLinus Torvalds 101898c6d1b2SDenis V. Lunev 10199b5b5cffSArjan van de Ven static const struct icmp6_err { 10201da177e4SLinus Torvalds int err; 10211da177e4SLinus Torvalds int fatal; 10221da177e4SLinus Torvalds } tab_unreach[] = { 10231da177e4SLinus Torvalds { /* NOROUTE */ 10241da177e4SLinus Torvalds .err = ENETUNREACH, 10251da177e4SLinus Torvalds .fatal = 0, 10261da177e4SLinus Torvalds }, 10271da177e4SLinus Torvalds { /* ADM_PROHIBITED */ 10281da177e4SLinus Torvalds .err = EACCES, 10291da177e4SLinus Torvalds .fatal = 1, 10301da177e4SLinus Torvalds }, 10311da177e4SLinus Torvalds { /* Was NOT_NEIGHBOUR, now reserved */ 10321da177e4SLinus Torvalds .err = EHOSTUNREACH, 10331da177e4SLinus Torvalds .fatal = 0, 10341da177e4SLinus Torvalds }, 10351da177e4SLinus Torvalds { /* ADDR_UNREACH */ 10361da177e4SLinus Torvalds .err = EHOSTUNREACH, 10371da177e4SLinus Torvalds .fatal = 0, 10381da177e4SLinus Torvalds }, 10391da177e4SLinus Torvalds { /* PORT_UNREACH */ 10401da177e4SLinus Torvalds .err = ECONNREFUSED, 10411da177e4SLinus Torvalds .fatal = 1, 10421da177e4SLinus Torvalds }, 104361e76b17SJiri Bohac { /* POLICY_FAIL */ 104461e76b17SJiri Bohac .err = EACCES, 104561e76b17SJiri Bohac .fatal = 1, 104661e76b17SJiri Bohac }, 104761e76b17SJiri Bohac { /* REJECT_ROUTE */ 104861e76b17SJiri Bohac .err = EACCES, 104961e76b17SJiri Bohac .fatal = 1, 105061e76b17SJiri Bohac }, 10511da177e4SLinus Torvalds }; 10521da177e4SLinus Torvalds 1053d5fdd6baSBrian Haley int icmpv6_err_convert(u8 type, u8 code, int *err) 10541da177e4SLinus Torvalds { 10551da177e4SLinus Torvalds int fatal = 0; 10561da177e4SLinus Torvalds 10571da177e4SLinus Torvalds *err = EPROTO; 10581da177e4SLinus Torvalds 10591da177e4SLinus Torvalds switch (type) { 10601da177e4SLinus Torvalds case ICMPV6_DEST_UNREACH: 10611da177e4SLinus Torvalds fatal = 1; 106261e76b17SJiri Bohac if (code < ARRAY_SIZE(tab_unreach)) { 10631da177e4SLinus Torvalds *err = tab_unreach[code].err; 10641da177e4SLinus Torvalds fatal = tab_unreach[code].fatal; 10651da177e4SLinus Torvalds } 10661da177e4SLinus Torvalds break; 10671da177e4SLinus Torvalds 10681da177e4SLinus Torvalds case ICMPV6_PKT_TOOBIG: 10691da177e4SLinus Torvalds *err = EMSGSIZE; 10701da177e4SLinus Torvalds break; 10711da177e4SLinus Torvalds 10721da177e4SLinus Torvalds case ICMPV6_PARAMPROB: 10731da177e4SLinus Torvalds *err = EPROTO; 10741da177e4SLinus Torvalds fatal = 1; 10751da177e4SLinus Torvalds break; 10761da177e4SLinus Torvalds 10771da177e4SLinus Torvalds case ICMPV6_TIME_EXCEED: 10781da177e4SLinus Torvalds *err = EHOSTUNREACH; 10791da177e4SLinus Torvalds break; 10803ff50b79SStephen Hemminger } 10811da177e4SLinus Torvalds 10821da177e4SLinus Torvalds return fatal; 10831da177e4SLinus Torvalds } 10847159039aSYOSHIFUJI Hideaki EXPORT_SYMBOL(icmpv6_err_convert); 10857159039aSYOSHIFUJI Hideaki 10861da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 1087e8243534Sstephen hemminger static struct ctl_table ipv6_icmp_table_template[] = { 10881da177e4SLinus Torvalds { 10891da177e4SLinus Torvalds .procname = "ratelimit", 109041a76906SDaniel Lezcano .data = &init_net.ipv6.sysctl.icmpv6_time, 10911da177e4SLinus Torvalds .maxlen = sizeof(int), 10921da177e4SLinus Torvalds .mode = 0644, 10936d9f239aSAlexey Dobriyan .proc_handler = proc_dointvec_ms_jiffies, 10941da177e4SLinus Torvalds }, 1095f8572d8fSEric W. Biederman { }, 10961da177e4SLinus Torvalds }; 1097760f2d01SDaniel Lezcano 10982c8c1e72SAlexey Dobriyan struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) 1099760f2d01SDaniel Lezcano { 1100760f2d01SDaniel Lezcano struct ctl_table *table; 1101760f2d01SDaniel Lezcano 1102760f2d01SDaniel Lezcano table = kmemdup(ipv6_icmp_table_template, 1103760f2d01SDaniel Lezcano sizeof(ipv6_icmp_table_template), 1104760f2d01SDaniel Lezcano GFP_KERNEL); 11055ee09105SYOSHIFUJI Hideaki 1106c027aab4SEric W. Biederman if (table) 11075ee09105SYOSHIFUJI Hideaki table[0].data = &net->ipv6.sysctl.icmpv6_time; 11085ee09105SYOSHIFUJI Hideaki 1109760f2d01SDaniel Lezcano return table; 1110760f2d01SDaniel Lezcano } 11111da177e4SLinus Torvalds #endif 1112