Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Internet Control Message Protocol (ICMPv6) |
| 3 | * Linux INET6 implementation |
| 4 | * |
| 5 | * Authors: |
| 6 | * Pedro Roque <roque@di.fc.ul.pt> |
| 7 | * |
| 8 | * $Id: icmp.c,v 1.38 2002/02/08 03:57:19 davem Exp $ |
| 9 | * |
| 10 | * Based on net/ipv4/icmp.c |
| 11 | * |
| 12 | * RFC 1885 |
| 13 | * |
| 14 | * This program is free software; you can redistribute it and/or |
| 15 | * modify it under the terms of the GNU General Public License |
| 16 | * as published by the Free Software Foundation; either version |
| 17 | * 2 of the License, or (at your option) any later version. |
| 18 | */ |
| 19 | |
| 20 | /* |
| 21 | * Changes: |
| 22 | * |
| 23 | * Andi Kleen : exception handling |
| 24 | * Andi Kleen add rate limits. never reply to a icmp. |
| 25 | * add more length checks and other fixes. |
| 26 | * yoshfuji : ensure to sent parameter problem for |
| 27 | * fragments. |
| 28 | * YOSHIFUJI Hideaki @USAGI: added sysctl for icmp rate limit. |
| 29 | * Randy Dunlap and |
| 30 | * YOSHIFUJI Hideaki @USAGI: Per-interface statistics support |
| 31 | * Kazunori MIYAZAWA @USAGI: change output process to use ip6_append_data |
| 32 | */ |
| 33 | |
| 34 | #include <linux/module.h> |
| 35 | #include <linux/errno.h> |
| 36 | #include <linux/types.h> |
| 37 | #include <linux/socket.h> |
| 38 | #include <linux/in.h> |
| 39 | #include <linux/kernel.h> |
| 40 | #include <linux/sched.h> |
| 41 | #include <linux/sockios.h> |
| 42 | #include <linux/net.h> |
| 43 | #include <linux/skbuff.h> |
| 44 | #include <linux/init.h> |
Yasuyuki Kozakai | 763ecff | 2006-02-15 15:24:15 -0800 | [diff] [blame] | 45 | #include <linux/netfilter.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
| 47 | #ifdef CONFIG_SYSCTL |
| 48 | #include <linux/sysctl.h> |
| 49 | #endif |
| 50 | |
| 51 | #include <linux/inet.h> |
| 52 | #include <linux/netdevice.h> |
| 53 | #include <linux/icmpv6.h> |
| 54 | |
| 55 | #include <net/ip.h> |
| 56 | #include <net/sock.h> |
| 57 | |
| 58 | #include <net/ipv6.h> |
| 59 | #include <net/ip6_checksum.h> |
| 60 | #include <net/protocol.h> |
| 61 | #include <net/raw.h> |
| 62 | #include <net/rawv6.h> |
| 63 | #include <net/transp_v6.h> |
| 64 | #include <net/ip6_route.h> |
| 65 | #include <net/addrconf.h> |
| 66 | #include <net/icmp.h> |
| 67 | |
| 68 | #include <asm/uaccess.h> |
| 69 | #include <asm/system.h> |
| 70 | |
Eric Dumazet | ba89966 | 2005-08-26 12:05:31 -0700 | [diff] [blame] | 71 | DEFINE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics) __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
| 73 | /* |
| 74 | * The ICMP socket(s). This is the most convenient way to flow control |
| 75 | * our ICMP output as well as maintain a clean interface throughout |
| 76 | * all layers. All Socketless IP sends will soon be gone. |
| 77 | * |
| 78 | * On SMP we have one ICMP socket per-cpu. |
| 79 | */ |
| 80 | static DEFINE_PER_CPU(struct socket *, __icmpv6_socket) = NULL; |
| 81 | #define icmpv6_socket __get_cpu_var(__icmpv6_socket) |
| 82 | |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 83 | static int icmpv6_rcv(struct sk_buff **pskb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
| 85 | static struct inet6_protocol icmpv6_protocol = { |
| 86 | .handler = icmpv6_rcv, |
| 87 | .flags = INET6_PROTO_FINAL, |
| 88 | }; |
| 89 | |
| 90 | static __inline__ int icmpv6_xmit_lock(void) |
| 91 | { |
| 92 | local_bh_disable(); |
| 93 | |
| 94 | if (unlikely(!spin_trylock(&icmpv6_socket->sk->sk_lock.slock))) { |
| 95 | /* This can happen if the output path (f.e. SIT or |
| 96 | * ip6ip6 tunnel) signals dst_link_failure() for an |
| 97 | * outgoing ICMP6 packet. |
| 98 | */ |
| 99 | local_bh_enable(); |
| 100 | return 1; |
| 101 | } |
| 102 | return 0; |
| 103 | } |
| 104 | |
| 105 | static __inline__ void icmpv6_xmit_unlock(void) |
| 106 | { |
| 107 | spin_unlock_bh(&icmpv6_socket->sk->sk_lock.slock); |
| 108 | } |
| 109 | |
| 110 | /* |
| 111 | * Slightly more convenient version of icmpv6_send. |
| 112 | */ |
| 113 | void icmpv6_param_prob(struct sk_buff *skb, int code, int pos) |
| 114 | { |
| 115 | icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos, skb->dev); |
| 116 | kfree_skb(skb); |
| 117 | } |
| 118 | |
| 119 | /* |
| 120 | * Figure out, may we reply to this packet with icmp error. |
| 121 | * |
| 122 | * We do not reply, if: |
| 123 | * - it was icmp error message. |
| 124 | * - it is truncated, so that it is known, that protocol is ICMPV6 |
| 125 | * (i.e. in the middle of some exthdr) |
| 126 | * |
| 127 | * --ANK (980726) |
| 128 | */ |
| 129 | |
| 130 | static int is_ineligible(struct sk_buff *skb) |
| 131 | { |
| 132 | int ptr = (u8*)(skb->nh.ipv6h+1) - skb->data; |
| 133 | int len = skb->len - ptr; |
| 134 | __u8 nexthdr = skb->nh.ipv6h->nexthdr; |
| 135 | |
| 136 | if (len < 0) |
| 137 | return 1; |
| 138 | |
Herbert Xu | 0d3d077 | 2005-04-24 20:16:19 -0700 | [diff] [blame] | 139 | ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | if (ptr < 0) |
| 141 | return 0; |
| 142 | if (nexthdr == IPPROTO_ICMPV6) { |
| 143 | u8 _type, *tp; |
| 144 | tp = skb_header_pointer(skb, |
| 145 | ptr+offsetof(struct icmp6hdr, icmp6_type), |
| 146 | sizeof(_type), &_type); |
| 147 | if (tp == NULL || |
| 148 | !(*tp & ICMPV6_INFOMSG_MASK)) |
| 149 | return 1; |
| 150 | } |
| 151 | return 0; |
| 152 | } |
| 153 | |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 154 | static int sysctl_icmpv6_time __read_mostly = 1*HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
| 156 | /* |
| 157 | * Check the ICMP output rate limit |
| 158 | */ |
| 159 | static inline int icmpv6_xrlim_allow(struct sock *sk, int type, |
| 160 | struct flowi *fl) |
| 161 | { |
| 162 | struct dst_entry *dst; |
| 163 | int res = 0; |
| 164 | |
| 165 | /* Informational messages are not limited. */ |
| 166 | if (type & ICMPV6_INFOMSG_MASK) |
| 167 | return 1; |
| 168 | |
| 169 | /* Do not limit pmtu discovery, it would break it. */ |
| 170 | if (type == ICMPV6_PKT_TOOBIG) |
| 171 | return 1; |
| 172 | |
| 173 | /* |
| 174 | * Look up the output route. |
| 175 | * XXX: perhaps the expire for routing entries cloned by |
| 176 | * this lookup should be more aggressive (not longer than timeout). |
| 177 | */ |
| 178 | dst = ip6_route_output(sk, fl); |
| 179 | if (dst->error) { |
| 180 | IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES); |
| 181 | } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { |
| 182 | res = 1; |
| 183 | } else { |
| 184 | struct rt6_info *rt = (struct rt6_info *)dst; |
| 185 | int tmo = sysctl_icmpv6_time; |
| 186 | |
| 187 | /* Give more bandwidth to wider prefixes. */ |
| 188 | if (rt->rt6i_dst.plen < 128) |
| 189 | tmo >>= ((128 - rt->rt6i_dst.plen)>>5); |
| 190 | |
| 191 | res = xrlim_allow(dst, tmo); |
| 192 | } |
| 193 | dst_release(dst); |
| 194 | return res; |
| 195 | } |
| 196 | |
| 197 | /* |
| 198 | * an inline helper for the "simple" if statement below |
| 199 | * checks if parameter problem report is caused by an |
| 200 | * unrecognized IPv6 option that has the Option Type |
| 201 | * highest-order two bits set to 10 |
| 202 | */ |
| 203 | |
| 204 | static __inline__ int opt_unrec(struct sk_buff *skb, __u32 offset) |
| 205 | { |
| 206 | u8 _optval, *op; |
| 207 | |
| 208 | offset += skb->nh.raw - skb->data; |
| 209 | op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); |
| 210 | if (op == NULL) |
| 211 | return 1; |
| 212 | return (*op & 0xC0) == 0x80; |
| 213 | } |
| 214 | |
| 215 | static int icmpv6_push_pending_frames(struct sock *sk, struct flowi *fl, struct icmp6hdr *thdr, int len) |
| 216 | { |
| 217 | struct sk_buff *skb; |
| 218 | struct icmp6hdr *icmp6h; |
| 219 | int err = 0; |
| 220 | |
| 221 | if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) |
| 222 | goto out; |
| 223 | |
| 224 | icmp6h = (struct icmp6hdr*) skb->h.raw; |
| 225 | memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); |
| 226 | icmp6h->icmp6_cksum = 0; |
| 227 | |
| 228 | if (skb_queue_len(&sk->sk_write_queue) == 1) { |
| 229 | skb->csum = csum_partial((char *)icmp6h, |
| 230 | sizeof(struct icmp6hdr), skb->csum); |
| 231 | icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src, |
| 232 | &fl->fl6_dst, |
| 233 | len, fl->proto, |
| 234 | skb->csum); |
| 235 | } else { |
| 236 | u32 tmp_csum = 0; |
| 237 | |
| 238 | skb_queue_walk(&sk->sk_write_queue, skb) { |
| 239 | tmp_csum = csum_add(tmp_csum, skb->csum); |
| 240 | } |
| 241 | |
| 242 | tmp_csum = csum_partial((char *)icmp6h, |
| 243 | sizeof(struct icmp6hdr), tmp_csum); |
| 244 | tmp_csum = csum_ipv6_magic(&fl->fl6_src, |
| 245 | &fl->fl6_dst, |
| 246 | len, fl->proto, tmp_csum); |
| 247 | icmp6h->icmp6_cksum = tmp_csum; |
| 248 | } |
| 249 | if (icmp6h->icmp6_cksum == 0) |
| 250 | icmp6h->icmp6_cksum = -1; |
| 251 | ip6_push_pending_frames(sk); |
| 252 | out: |
| 253 | return err; |
| 254 | } |
| 255 | |
| 256 | struct icmpv6_msg { |
| 257 | struct sk_buff *skb; |
| 258 | int offset; |
Yasuyuki Kozakai | 763ecff | 2006-02-15 15:24:15 -0800 | [diff] [blame] | 259 | uint8_t type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | }; |
| 261 | |
| 262 | static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) |
| 263 | { |
| 264 | struct icmpv6_msg *msg = (struct icmpv6_msg *) from; |
| 265 | struct sk_buff *org_skb = msg->skb; |
| 266 | __u32 csum = 0; |
| 267 | |
| 268 | csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, |
| 269 | to, len, csum); |
| 270 | skb->csum = csum_block_add(skb->csum, csum, odd); |
Yasuyuki Kozakai | 763ecff | 2006-02-15 15:24:15 -0800 | [diff] [blame] | 271 | if (!(msg->type & ICMPV6_INFOMSG_MASK)) |
| 272 | nf_ct_attach(skb, org_skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | return 0; |
| 274 | } |
| 275 | |
Masahide NAKAMURA | 7938323 | 2006-08-23 19:27:25 -0700 | [diff] [blame] | 276 | #ifdef CONFIG_IPV6_MIP6 |
| 277 | static void mip6_addr_swap(struct sk_buff *skb) |
| 278 | { |
| 279 | struct ipv6hdr *iph = skb->nh.ipv6h; |
| 280 | struct inet6_skb_parm *opt = IP6CB(skb); |
| 281 | struct ipv6_destopt_hao *hao; |
| 282 | struct in6_addr tmp; |
| 283 | int off; |
| 284 | |
| 285 | if (opt->dsthao) { |
| 286 | off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); |
| 287 | if (likely(off >= 0)) { |
| 288 | hao = (struct ipv6_destopt_hao *)(skb->nh.raw + off); |
| 289 | ipv6_addr_copy(&tmp, &iph->saddr); |
| 290 | ipv6_addr_copy(&iph->saddr, &hao->addr); |
| 291 | ipv6_addr_copy(&hao->addr, &tmp); |
| 292 | } |
| 293 | } |
| 294 | } |
| 295 | #else |
| 296 | static inline void mip6_addr_swap(struct sk_buff *skb) {} |
| 297 | #endif |
| 298 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | /* |
| 300 | * Send an ICMP message in response to a packet in error |
| 301 | */ |
| 302 | void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info, |
| 303 | struct net_device *dev) |
| 304 | { |
| 305 | struct inet6_dev *idev = NULL; |
| 306 | struct ipv6hdr *hdr = skb->nh.ipv6h; |
YOSHIFUJI Hideaki | 84427d5 | 2005-06-13 14:59:44 -0700 | [diff] [blame] | 307 | struct sock *sk; |
| 308 | struct ipv6_pinfo *np; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | struct in6_addr *saddr = NULL; |
| 310 | struct dst_entry *dst; |
| 311 | struct icmp6hdr tmp_hdr; |
| 312 | struct flowi fl; |
| 313 | struct icmpv6_msg msg; |
| 314 | int iif = 0; |
| 315 | int addr_type = 0; |
| 316 | int len; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 317 | int hlimit, tclass; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | int err = 0; |
| 319 | |
| 320 | if ((u8*)hdr < skb->head || (u8*)(hdr+1) > skb->tail) |
| 321 | return; |
| 322 | |
| 323 | /* |
| 324 | * Make sure we respect the rules |
| 325 | * i.e. RFC 1885 2.4(e) |
| 326 | * Rule (e.1) is enforced by not using icmpv6_send |
| 327 | * in any code that processes icmp errors. |
| 328 | */ |
| 329 | addr_type = ipv6_addr_type(&hdr->daddr); |
| 330 | |
| 331 | if (ipv6_chk_addr(&hdr->daddr, skb->dev, 0)) |
| 332 | saddr = &hdr->daddr; |
| 333 | |
| 334 | /* |
| 335 | * Dest addr check |
| 336 | */ |
| 337 | |
| 338 | if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) { |
| 339 | if (type != ICMPV6_PKT_TOOBIG && |
| 340 | !(type == ICMPV6_PARAMPROB && |
| 341 | code == ICMPV6_UNK_OPTION && |
| 342 | (opt_unrec(skb, info)))) |
| 343 | return; |
| 344 | |
| 345 | saddr = NULL; |
| 346 | } |
| 347 | |
| 348 | addr_type = ipv6_addr_type(&hdr->saddr); |
| 349 | |
| 350 | /* |
| 351 | * Source addr check |
| 352 | */ |
| 353 | |
| 354 | if (addr_type & IPV6_ADDR_LINKLOCAL) |
| 355 | iif = skb->dev->ifindex; |
| 356 | |
| 357 | /* |
YOSHIFUJI Hideaki | 8de3351 | 2005-12-21 22:57:06 +0900 | [diff] [blame] | 358 | * Must not send error if the source does not uniquely |
| 359 | * identify a single node (RFC2463 Section 2.4). |
| 360 | * We check unspecified / multicast addresses here, |
| 361 | * and anycast addresses will be checked later. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | */ |
| 363 | if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 364 | LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | return; |
| 366 | } |
| 367 | |
| 368 | /* |
| 369 | * Never answer to a ICMP packet. |
| 370 | */ |
| 371 | if (is_ineligible(skb)) { |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 372 | LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | return; |
| 374 | } |
| 375 | |
Masahide NAKAMURA | 7938323 | 2006-08-23 19:27:25 -0700 | [diff] [blame] | 376 | mip6_addr_swap(skb); |
| 377 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | memset(&fl, 0, sizeof(fl)); |
| 379 | fl.proto = IPPROTO_ICMPV6; |
| 380 | ipv6_addr_copy(&fl.fl6_dst, &hdr->saddr); |
| 381 | if (saddr) |
| 382 | ipv6_addr_copy(&fl.fl6_src, saddr); |
| 383 | fl.oif = iif; |
| 384 | fl.fl_icmp_type = type; |
| 385 | fl.fl_icmp_code = code; |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 386 | security_skb_classify_flow(skb, &fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | |
| 388 | if (icmpv6_xmit_lock()) |
| 389 | return; |
| 390 | |
YOSHIFUJI Hideaki | 84427d5 | 2005-06-13 14:59:44 -0700 | [diff] [blame] | 391 | sk = icmpv6_socket->sk; |
| 392 | np = inet6_sk(sk); |
| 393 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | if (!icmpv6_xrlim_allow(sk, type, &fl)) |
| 395 | goto out; |
| 396 | |
| 397 | tmp_hdr.icmp6_type = type; |
| 398 | tmp_hdr.icmp6_code = code; |
| 399 | tmp_hdr.icmp6_cksum = 0; |
| 400 | tmp_hdr.icmp6_pointer = htonl(info); |
| 401 | |
| 402 | if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) |
| 403 | fl.oif = np->mcast_oif; |
| 404 | |
| 405 | err = ip6_dst_lookup(sk, &dst, &fl); |
| 406 | if (err) |
| 407 | goto out; |
YOSHIFUJI Hideaki | 8de3351 | 2005-12-21 22:57:06 +0900 | [diff] [blame] | 408 | |
| 409 | /* |
| 410 | * We won't send icmp if the destination is known |
| 411 | * anycast. |
| 412 | */ |
| 413 | if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { |
| 414 | LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n"); |
| 415 | goto out_dst_release; |
| 416 | } |
| 417 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) |
Patrick McHardy | e104411b | 2005-09-08 15:11:55 -0700 | [diff] [blame] | 419 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | |
| 421 | if (ipv6_addr_is_multicast(&fl.fl6_dst)) |
| 422 | hlimit = np->mcast_hops; |
| 423 | else |
| 424 | hlimit = np->hop_limit; |
| 425 | if (hlimit < 0) |
| 426 | hlimit = dst_metric(dst, RTAX_HOPLIMIT); |
| 427 | if (hlimit < 0) |
| 428 | hlimit = ipv6_get_hoplimit(dst->dev); |
| 429 | |
YOSHIFUJI Hideaki | e012d51 | 2006-09-13 20:01:28 -0700 | [diff] [blame] | 430 | tclass = np->tclass; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 431 | if (tclass < 0) |
| 432 | tclass = 0; |
| 433 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | msg.skb = skb; |
| 435 | msg.offset = skb->nh.raw - skb->data; |
Yasuyuki Kozakai | 763ecff | 2006-02-15 15:24:15 -0800 | [diff] [blame] | 436 | msg.type = type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | |
| 438 | len = skb->len - msg.offset; |
| 439 | len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); |
| 440 | if (len < 0) { |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 441 | LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | goto out_dst_release; |
| 443 | } |
| 444 | |
| 445 | idev = in6_dev_get(skb->dev); |
| 446 | |
| 447 | err = ip6_append_data(sk, icmpv6_getfrag, &msg, |
| 448 | len + sizeof(struct icmp6hdr), |
| 449 | sizeof(struct icmp6hdr), |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 450 | hlimit, tclass, NULL, &fl, (struct rt6_info*)dst, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | MSG_DONTWAIT); |
| 452 | if (err) { |
| 453 | ip6_flush_pending_frames(sk); |
| 454 | goto out_put; |
| 455 | } |
| 456 | err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, len + sizeof(struct icmp6hdr)); |
| 457 | |
| 458 | if (type >= ICMPV6_DEST_UNREACH && type <= ICMPV6_PARAMPROB) |
| 459 | ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_OUTDESTUNREACHS, type - ICMPV6_DEST_UNREACH); |
| 460 | ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS); |
| 461 | |
| 462 | out_put: |
| 463 | if (likely(idev != NULL)) |
| 464 | in6_dev_put(idev); |
| 465 | out_dst_release: |
| 466 | dst_release(dst); |
| 467 | out: |
| 468 | icmpv6_xmit_unlock(); |
| 469 | } |
| 470 | |
| 471 | static void icmpv6_echo_reply(struct sk_buff *skb) |
| 472 | { |
YOSHIFUJI Hideaki | 84427d5 | 2005-06-13 14:59:44 -0700 | [diff] [blame] | 473 | struct sock *sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | struct inet6_dev *idev; |
YOSHIFUJI Hideaki | 84427d5 | 2005-06-13 14:59:44 -0700 | [diff] [blame] | 475 | struct ipv6_pinfo *np; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | struct in6_addr *saddr = NULL; |
| 477 | struct icmp6hdr *icmph = (struct icmp6hdr *) skb->h.raw; |
| 478 | struct icmp6hdr tmp_hdr; |
| 479 | struct flowi fl; |
| 480 | struct icmpv6_msg msg; |
| 481 | struct dst_entry *dst; |
| 482 | int err = 0; |
| 483 | int hlimit; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 484 | int tclass; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | |
| 486 | saddr = &skb->nh.ipv6h->daddr; |
| 487 | |
| 488 | if (!ipv6_unicast_destination(skb)) |
| 489 | saddr = NULL; |
| 490 | |
| 491 | memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); |
| 492 | tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; |
| 493 | |
| 494 | memset(&fl, 0, sizeof(fl)); |
| 495 | fl.proto = IPPROTO_ICMPV6; |
| 496 | ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); |
| 497 | if (saddr) |
| 498 | ipv6_addr_copy(&fl.fl6_src, saddr); |
| 499 | fl.oif = skb->dev->ifindex; |
| 500 | fl.fl_icmp_type = ICMPV6_ECHO_REPLY; |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 501 | security_skb_classify_flow(skb, &fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | |
| 503 | if (icmpv6_xmit_lock()) |
| 504 | return; |
| 505 | |
YOSHIFUJI Hideaki | 84427d5 | 2005-06-13 14:59:44 -0700 | [diff] [blame] | 506 | sk = icmpv6_socket->sk; |
| 507 | np = inet6_sk(sk); |
| 508 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) |
| 510 | fl.oif = np->mcast_oif; |
| 511 | |
| 512 | err = ip6_dst_lookup(sk, &dst, &fl); |
| 513 | if (err) |
| 514 | goto out; |
| 515 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) |
Patrick McHardy | e104411b | 2005-09-08 15:11:55 -0700 | [diff] [blame] | 516 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | |
| 518 | if (ipv6_addr_is_multicast(&fl.fl6_dst)) |
| 519 | hlimit = np->mcast_hops; |
| 520 | else |
| 521 | hlimit = np->hop_limit; |
| 522 | if (hlimit < 0) |
| 523 | hlimit = dst_metric(dst, RTAX_HOPLIMIT); |
| 524 | if (hlimit < 0) |
| 525 | hlimit = ipv6_get_hoplimit(dst->dev); |
| 526 | |
YOSHIFUJI Hideaki | e012d51 | 2006-09-13 20:01:28 -0700 | [diff] [blame] | 527 | tclass = np->tclass; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 528 | if (tclass < 0) |
| 529 | tclass = 0; |
| 530 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | idev = in6_dev_get(skb->dev); |
| 532 | |
| 533 | msg.skb = skb; |
| 534 | msg.offset = 0; |
Yasuyuki Kozakai | 763ecff | 2006-02-15 15:24:15 -0800 | [diff] [blame] | 535 | msg.type = ICMPV6_ECHO_REPLY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | |
| 537 | err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 538 | sizeof(struct icmp6hdr), hlimit, tclass, NULL, &fl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | (struct rt6_info*)dst, MSG_DONTWAIT); |
| 540 | |
| 541 | if (err) { |
| 542 | ip6_flush_pending_frames(sk); |
| 543 | goto out_put; |
| 544 | } |
| 545 | err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, skb->len + sizeof(struct icmp6hdr)); |
| 546 | |
| 547 | ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTECHOREPLIES); |
| 548 | ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS); |
| 549 | |
| 550 | out_put: |
| 551 | if (likely(idev != NULL)) |
| 552 | in6_dev_put(idev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | dst_release(dst); |
| 554 | out: |
| 555 | icmpv6_xmit_unlock(); |
| 556 | } |
| 557 | |
Al Viro | 04ce690 | 2006-11-08 00:21:01 -0800 | [diff] [blame^] | 558 | static void icmpv6_notify(struct sk_buff *skb, int type, int code, __be32 info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | { |
| 560 | struct in6_addr *saddr, *daddr; |
| 561 | struct inet6_protocol *ipprot; |
| 562 | struct sock *sk; |
| 563 | int inner_offset; |
| 564 | int hash; |
| 565 | u8 nexthdr; |
| 566 | |
| 567 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
| 568 | return; |
| 569 | |
| 570 | nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; |
| 571 | if (ipv6_ext_hdr(nexthdr)) { |
| 572 | /* now skip over extension headers */ |
Herbert Xu | 0d3d077 | 2005-04-24 20:16:19 -0700 | [diff] [blame] | 573 | inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | if (inner_offset<0) |
| 575 | return; |
| 576 | } else { |
| 577 | inner_offset = sizeof(struct ipv6hdr); |
| 578 | } |
| 579 | |
| 580 | /* Checkin header including 8 bytes of inner protocol header. */ |
| 581 | if (!pskb_may_pull(skb, inner_offset+8)) |
| 582 | return; |
| 583 | |
| 584 | saddr = &skb->nh.ipv6h->saddr; |
| 585 | daddr = &skb->nh.ipv6h->daddr; |
| 586 | |
| 587 | /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. |
| 588 | Without this we will not able f.e. to make source routed |
| 589 | pmtu discovery. |
| 590 | Corresponding argument (opt) to notifiers is already added. |
| 591 | --ANK (980726) |
| 592 | */ |
| 593 | |
| 594 | hash = nexthdr & (MAX_INET_PROTOS - 1); |
| 595 | |
| 596 | rcu_read_lock(); |
| 597 | ipprot = rcu_dereference(inet6_protos[hash]); |
| 598 | if (ipprot && ipprot->err_handler) |
| 599 | ipprot->err_handler(skb, NULL, type, code, inner_offset, info); |
| 600 | rcu_read_unlock(); |
| 601 | |
| 602 | read_lock(&raw_v6_lock); |
| 603 | if ((sk = sk_head(&raw_v6_htable[hash])) != NULL) { |
Andrew McDonald | 0bd1b59 | 2005-08-09 19:44:42 -0700 | [diff] [blame] | 604 | while((sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr, |
YOSHIFUJI Hideaki | 2dac4b9 | 2005-09-01 17:44:49 -0700 | [diff] [blame] | 605 | IP6CB(skb)->iif))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | rawv6_err(sk, skb, NULL, type, code, inner_offset, info); |
| 607 | sk = sk_next(sk); |
| 608 | } |
| 609 | } |
| 610 | read_unlock(&raw_v6_lock); |
| 611 | } |
| 612 | |
| 613 | /* |
| 614 | * Handle icmp messages |
| 615 | */ |
| 616 | |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 617 | static int icmpv6_rcv(struct sk_buff **pskb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | { |
| 619 | struct sk_buff *skb = *pskb; |
| 620 | struct net_device *dev = skb->dev; |
| 621 | struct inet6_dev *idev = __in6_dev_get(dev); |
| 622 | struct in6_addr *saddr, *daddr; |
| 623 | struct ipv6hdr *orig_hdr; |
| 624 | struct icmp6hdr *hdr; |
| 625 | int type; |
| 626 | |
| 627 | ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INMSGS); |
| 628 | |
| 629 | saddr = &skb->nh.ipv6h->saddr; |
| 630 | daddr = &skb->nh.ipv6h->daddr; |
| 631 | |
| 632 | /* Perform checksum. */ |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 633 | switch (skb->ip_summed) { |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 634 | case CHECKSUM_COMPLETE: |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 635 | if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, |
| 636 | skb->csum)) |
| 637 | break; |
| 638 | /* fall through */ |
| 639 | case CHECKSUM_NONE: |
| 640 | skb->csum = ~csum_ipv6_magic(saddr, daddr, skb->len, |
| 641 | IPPROTO_ICMPV6, 0); |
| 642 | if (__skb_checksum_complete(skb)) { |
Joe Perches | 46b86a2 | 2006-01-13 14:29:07 -0800 | [diff] [blame] | 643 | LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [" NIP6_FMT " > " NIP6_FMT "]\n", |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 644 | NIP6(*saddr), NIP6(*daddr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | goto discard_it; |
| 646 | } |
| 647 | } |
| 648 | |
| 649 | if (!pskb_pull(skb, sizeof(struct icmp6hdr))) |
| 650 | goto discard_it; |
| 651 | |
| 652 | hdr = (struct icmp6hdr *) skb->h.raw; |
| 653 | |
| 654 | type = hdr->icmp6_type; |
| 655 | |
| 656 | if (type >= ICMPV6_DEST_UNREACH && type <= ICMPV6_PARAMPROB) |
| 657 | ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_INDESTUNREACHS, type - ICMPV6_DEST_UNREACH); |
| 658 | else if (type >= ICMPV6_ECHO_REQUEST && type <= NDISC_REDIRECT) |
| 659 | ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_INECHOS, type - ICMPV6_ECHO_REQUEST); |
| 660 | |
| 661 | switch (type) { |
| 662 | case ICMPV6_ECHO_REQUEST: |
| 663 | icmpv6_echo_reply(skb); |
| 664 | break; |
| 665 | |
| 666 | case ICMPV6_ECHO_REPLY: |
| 667 | /* we couldn't care less */ |
| 668 | break; |
| 669 | |
| 670 | case ICMPV6_PKT_TOOBIG: |
| 671 | /* BUGGG_FUTURE: if packet contains rthdr, we cannot update |
| 672 | standard destination cache. Seems, only "advanced" |
| 673 | destination cache will allow to solve this problem |
| 674 | --ANK (980726) |
| 675 | */ |
| 676 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
| 677 | goto discard_it; |
| 678 | hdr = (struct icmp6hdr *) skb->h.raw; |
| 679 | orig_hdr = (struct ipv6hdr *) (hdr + 1); |
| 680 | rt6_pmtu_discovery(&orig_hdr->daddr, &orig_hdr->saddr, dev, |
| 681 | ntohl(hdr->icmp6_mtu)); |
| 682 | |
| 683 | /* |
| 684 | * Drop through to notify |
| 685 | */ |
| 686 | |
| 687 | case ICMPV6_DEST_UNREACH: |
| 688 | case ICMPV6_TIME_EXCEED: |
| 689 | case ICMPV6_PARAMPROB: |
| 690 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); |
| 691 | break; |
| 692 | |
| 693 | case NDISC_ROUTER_SOLICITATION: |
| 694 | case NDISC_ROUTER_ADVERTISEMENT: |
| 695 | case NDISC_NEIGHBOUR_SOLICITATION: |
| 696 | case NDISC_NEIGHBOUR_ADVERTISEMENT: |
| 697 | case NDISC_REDIRECT: |
| 698 | ndisc_rcv(skb); |
| 699 | break; |
| 700 | |
| 701 | case ICMPV6_MGM_QUERY: |
| 702 | igmp6_event_query(skb); |
| 703 | break; |
| 704 | |
| 705 | case ICMPV6_MGM_REPORT: |
| 706 | igmp6_event_report(skb); |
| 707 | break; |
| 708 | |
| 709 | case ICMPV6_MGM_REDUCTION: |
| 710 | case ICMPV6_NI_QUERY: |
| 711 | case ICMPV6_NI_REPLY: |
| 712 | case ICMPV6_MLD2_REPORT: |
| 713 | case ICMPV6_DHAAD_REQUEST: |
| 714 | case ICMPV6_DHAAD_REPLY: |
| 715 | case ICMPV6_MOBILE_PREFIX_SOL: |
| 716 | case ICMPV6_MOBILE_PREFIX_ADV: |
| 717 | break; |
| 718 | |
| 719 | default: |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 720 | LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | |
| 722 | /* informational */ |
| 723 | if (type & ICMPV6_INFOMSG_MASK) |
| 724 | break; |
| 725 | |
| 726 | /* |
| 727 | * error of unknown type. |
| 728 | * must pass to upper level |
| 729 | */ |
| 730 | |
| 731 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); |
| 732 | }; |
| 733 | kfree_skb(skb); |
| 734 | return 0; |
| 735 | |
| 736 | discard_it: |
| 737 | ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS); |
| 738 | kfree_skb(skb); |
| 739 | return 0; |
| 740 | } |
| 741 | |
Ingo Molnar | 640c41c | 2006-08-15 00:06:56 -0700 | [diff] [blame] | 742 | /* |
| 743 | * Special lock-class for __icmpv6_socket: |
| 744 | */ |
| 745 | static struct lock_class_key icmpv6_socket_sk_dst_lock_key; |
| 746 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | int __init icmpv6_init(struct net_proto_family *ops) |
| 748 | { |
| 749 | struct sock *sk; |
| 750 | int err, i, j; |
| 751 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 752 | for_each_possible_cpu(i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, |
| 754 | &per_cpu(__icmpv6_socket, i)); |
| 755 | if (err < 0) { |
| 756 | printk(KERN_ERR |
| 757 | "Failed to initialize the ICMP6 control socket " |
| 758 | "(err %d).\n", |
| 759 | err); |
| 760 | goto fail; |
| 761 | } |
| 762 | |
| 763 | sk = per_cpu(__icmpv6_socket, i)->sk; |
| 764 | sk->sk_allocation = GFP_ATOMIC; |
Ingo Molnar | 640c41c | 2006-08-15 00:06:56 -0700 | [diff] [blame] | 765 | /* |
| 766 | * Split off their lock-class, because sk->sk_dst_lock |
| 767 | * gets used from softirqs, which is safe for |
| 768 | * __icmpv6_socket (because those never get directly used |
| 769 | * via userspace syscalls), but unsafe for normal sockets. |
| 770 | */ |
| 771 | lockdep_set_class(&sk->sk_dst_lock, |
| 772 | &icmpv6_socket_sk_dst_lock_key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | |
| 774 | /* Enough space for 2 64K ICMP packets, including |
| 775 | * sk_buff struct overhead. |
| 776 | */ |
| 777 | sk->sk_sndbuf = |
| 778 | (2 * ((64 * 1024) + sizeof(struct sk_buff))); |
| 779 | |
| 780 | sk->sk_prot->unhash(sk); |
| 781 | } |
| 782 | |
| 783 | |
| 784 | if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) { |
| 785 | printk(KERN_ERR "Failed to register ICMP6 protocol\n"); |
| 786 | err = -EAGAIN; |
| 787 | goto fail; |
| 788 | } |
| 789 | |
| 790 | return 0; |
| 791 | |
| 792 | fail: |
| 793 | for (j = 0; j < i; j++) { |
| 794 | if (!cpu_possible(j)) |
| 795 | continue; |
| 796 | sock_release(per_cpu(__icmpv6_socket, j)); |
| 797 | } |
| 798 | |
| 799 | return err; |
| 800 | } |
| 801 | |
| 802 | void icmpv6_cleanup(void) |
| 803 | { |
| 804 | int i; |
| 805 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 806 | for_each_possible_cpu(i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | sock_release(per_cpu(__icmpv6_socket, i)); |
| 808 | } |
| 809 | inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); |
| 810 | } |
| 811 | |
Arjan van de Ven | 9b5b5cf | 2005-11-29 16:21:38 -0800 | [diff] [blame] | 812 | static const struct icmp6_err { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | int err; |
| 814 | int fatal; |
| 815 | } tab_unreach[] = { |
| 816 | { /* NOROUTE */ |
| 817 | .err = ENETUNREACH, |
| 818 | .fatal = 0, |
| 819 | }, |
| 820 | { /* ADM_PROHIBITED */ |
| 821 | .err = EACCES, |
| 822 | .fatal = 1, |
| 823 | }, |
| 824 | { /* Was NOT_NEIGHBOUR, now reserved */ |
| 825 | .err = EHOSTUNREACH, |
| 826 | .fatal = 0, |
| 827 | }, |
| 828 | { /* ADDR_UNREACH */ |
| 829 | .err = EHOSTUNREACH, |
| 830 | .fatal = 0, |
| 831 | }, |
| 832 | { /* PORT_UNREACH */ |
| 833 | .err = ECONNREFUSED, |
| 834 | .fatal = 1, |
| 835 | }, |
| 836 | }; |
| 837 | |
| 838 | int icmpv6_err_convert(int type, int code, int *err) |
| 839 | { |
| 840 | int fatal = 0; |
| 841 | |
| 842 | *err = EPROTO; |
| 843 | |
| 844 | switch (type) { |
| 845 | case ICMPV6_DEST_UNREACH: |
| 846 | fatal = 1; |
| 847 | if (code <= ICMPV6_PORT_UNREACH) { |
| 848 | *err = tab_unreach[code].err; |
| 849 | fatal = tab_unreach[code].fatal; |
| 850 | } |
| 851 | break; |
| 852 | |
| 853 | case ICMPV6_PKT_TOOBIG: |
| 854 | *err = EMSGSIZE; |
| 855 | break; |
| 856 | |
| 857 | case ICMPV6_PARAMPROB: |
| 858 | *err = EPROTO; |
| 859 | fatal = 1; |
| 860 | break; |
| 861 | |
| 862 | case ICMPV6_TIME_EXCEED: |
| 863 | *err = EHOSTUNREACH; |
| 864 | break; |
| 865 | }; |
| 866 | |
| 867 | return fatal; |
| 868 | } |
| 869 | |
| 870 | #ifdef CONFIG_SYSCTL |
| 871 | ctl_table ipv6_icmp_table[] = { |
| 872 | { |
| 873 | .ctl_name = NET_IPV6_ICMP_RATELIMIT, |
| 874 | .procname = "ratelimit", |
| 875 | .data = &sysctl_icmpv6_time, |
| 876 | .maxlen = sizeof(int), |
| 877 | .mode = 0644, |
| 878 | .proc_handler = &proc_dointvec |
| 879 | }, |
| 880 | { .ctl_name = 0 }, |
| 881 | }; |
| 882 | #endif |
| 883 | |