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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <linux/sockios.h> |
| 41 | #include <linux/net.h> |
| 42 | #include <linux/skbuff.h> |
| 43 | #include <linux/init.h> |
Yasuyuki Kozakai | 763ecff | 2006-02-15 15:24:15 -0800 | [diff] [blame] | 44 | #include <linux/netfilter.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
| 46 | #ifdef CONFIG_SYSCTL |
| 47 | #include <linux/sysctl.h> |
| 48 | #endif |
| 49 | |
| 50 | #include <linux/inet.h> |
| 51 | #include <linux/netdevice.h> |
| 52 | #include <linux/icmpv6.h> |
| 53 | |
| 54 | #include <net/ip.h> |
| 55 | #include <net/sock.h> |
| 56 | |
| 57 | #include <net/ipv6.h> |
| 58 | #include <net/ip6_checksum.h> |
| 59 | #include <net/protocol.h> |
| 60 | #include <net/raw.h> |
| 61 | #include <net/rawv6.h> |
| 62 | #include <net/transp_v6.h> |
| 63 | #include <net/ip6_route.h> |
| 64 | #include <net/addrconf.h> |
| 65 | #include <net/icmp.h> |
| 66 | |
| 67 | #include <asm/uaccess.h> |
| 68 | #include <asm/system.h> |
| 69 | |
Eric Dumazet | ba89966 | 2005-08-26 12:05:31 -0700 | [diff] [blame] | 70 | DEFINE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics) __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
| 72 | /* |
| 73 | * The ICMP socket(s). This is the most convenient way to flow control |
| 74 | * our ICMP output as well as maintain a clean interface throughout |
| 75 | * all layers. All Socketless IP sends will soon be gone. |
| 76 | * |
| 77 | * On SMP we have one ICMP socket per-cpu. |
| 78 | */ |
| 79 | static DEFINE_PER_CPU(struct socket *, __icmpv6_socket) = NULL; |
| 80 | #define icmpv6_socket __get_cpu_var(__icmpv6_socket) |
| 81 | |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 82 | static int icmpv6_rcv(struct sk_buff **pskb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
| 84 | static struct inet6_protocol icmpv6_protocol = { |
| 85 | .handler = icmpv6_rcv, |
| 86 | .flags = INET6_PROTO_FINAL, |
| 87 | }; |
| 88 | |
| 89 | static __inline__ int icmpv6_xmit_lock(void) |
| 90 | { |
| 91 | local_bh_disable(); |
| 92 | |
| 93 | if (unlikely(!spin_trylock(&icmpv6_socket->sk->sk_lock.slock))) { |
| 94 | /* This can happen if the output path (f.e. SIT or |
| 95 | * ip6ip6 tunnel) signals dst_link_failure() for an |
| 96 | * outgoing ICMP6 packet. |
| 97 | */ |
| 98 | local_bh_enable(); |
| 99 | return 1; |
| 100 | } |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | static __inline__ void icmpv6_xmit_unlock(void) |
| 105 | { |
| 106 | spin_unlock_bh(&icmpv6_socket->sk->sk_lock.slock); |
| 107 | } |
| 108 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 109 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | * Slightly more convenient version of icmpv6_send. |
| 111 | */ |
| 112 | void icmpv6_param_prob(struct sk_buff *skb, int code, int pos) |
| 113 | { |
| 114 | icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos, skb->dev); |
| 115 | kfree_skb(skb); |
| 116 | } |
| 117 | |
| 118 | /* |
| 119 | * Figure out, may we reply to this packet with icmp error. |
| 120 | * |
| 121 | * We do not reply, if: |
| 122 | * - it was icmp error message. |
| 123 | * - it is truncated, so that it is known, that protocol is ICMPV6 |
| 124 | * (i.e. in the middle of some exthdr) |
| 125 | * |
| 126 | * --ANK (980726) |
| 127 | */ |
| 128 | |
| 129 | static int is_ineligible(struct sk_buff *skb) |
| 130 | { |
| 131 | int ptr = (u8*)(skb->nh.ipv6h+1) - skb->data; |
| 132 | int len = skb->len - ptr; |
| 133 | __u8 nexthdr = skb->nh.ipv6h->nexthdr; |
| 134 | |
| 135 | if (len < 0) |
| 136 | return 1; |
| 137 | |
Herbert Xu | 0d3d077 | 2005-04-24 20:16:19 -0700 | [diff] [blame] | 138 | ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | if (ptr < 0) |
| 140 | return 0; |
| 141 | if (nexthdr == IPPROTO_ICMPV6) { |
| 142 | u8 _type, *tp; |
| 143 | tp = skb_header_pointer(skb, |
| 144 | ptr+offsetof(struct icmp6hdr, icmp6_type), |
| 145 | sizeof(_type), &_type); |
| 146 | if (tp == NULL || |
| 147 | !(*tp & ICMPV6_INFOMSG_MASK)) |
| 148 | return 1; |
| 149 | } |
| 150 | return 0; |
| 151 | } |
| 152 | |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 153 | static int sysctl_icmpv6_time __read_mostly = 1*HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 155 | /* |
| 156 | * Check the ICMP output rate limit |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | */ |
| 158 | static inline int icmpv6_xrlim_allow(struct sock *sk, int type, |
| 159 | struct flowi *fl) |
| 160 | { |
| 161 | struct dst_entry *dst; |
| 162 | int res = 0; |
| 163 | |
| 164 | /* Informational messages are not limited. */ |
| 165 | if (type & ICMPV6_INFOMSG_MASK) |
| 166 | return 1; |
| 167 | |
| 168 | /* Do not limit pmtu discovery, it would break it. */ |
| 169 | if (type == ICMPV6_PKT_TOOBIG) |
| 170 | return 1; |
| 171 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 172 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | * Look up the output route. |
| 174 | * XXX: perhaps the expire for routing entries cloned by |
| 175 | * this lookup should be more aggressive (not longer than timeout). |
| 176 | */ |
| 177 | dst = ip6_route_output(sk, fl); |
| 178 | if (dst->error) { |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 179 | IP6_INC_STATS(ip6_dst_idev(dst), |
| 180 | IPSTATS_MIB_OUTNOROUTES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 200 | * unrecognized IPv6 option that has the Option Type |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 { |
Al Viro | 868c86b | 2006-11-14 21:35:48 -0800 | [diff] [blame] | 236 | __wsum tmp_csum = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Al Viro | 868c86b | 2006-11-14 21:35:48 -0800 | [diff] [blame] | 244 | icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src, |
| 245 | &fl->fl6_dst, |
| 246 | len, fl->proto, |
| 247 | tmp_csum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | ip6_push_pending_frames(sk); |
| 250 | out: |
| 251 | return err; |
| 252 | } |
| 253 | |
| 254 | struct icmpv6_msg { |
| 255 | struct sk_buff *skb; |
| 256 | int offset; |
Yasuyuki Kozakai | 763ecff | 2006-02-15 15:24:15 -0800 | [diff] [blame] | 257 | uint8_t type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | }; |
| 259 | |
| 260 | static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) |
| 261 | { |
| 262 | struct icmpv6_msg *msg = (struct icmpv6_msg *) from; |
| 263 | struct sk_buff *org_skb = msg->skb; |
Al Viro | 5f92a73 | 2006-11-14 21:36:54 -0800 | [diff] [blame] | 264 | __wsum csum = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | |
| 266 | csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, |
| 267 | to, len, csum); |
| 268 | skb->csum = csum_block_add(skb->csum, csum, odd); |
Yasuyuki Kozakai | 763ecff | 2006-02-15 15:24:15 -0800 | [diff] [blame] | 269 | if (!(msg->type & ICMPV6_INFOMSG_MASK)) |
| 270 | nf_ct_attach(skb, org_skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | return 0; |
| 272 | } |
| 273 | |
Masahide NAKAMURA | 7938323 | 2006-08-23 19:27:25 -0700 | [diff] [blame] | 274 | #ifdef CONFIG_IPV6_MIP6 |
| 275 | static void mip6_addr_swap(struct sk_buff *skb) |
| 276 | { |
| 277 | struct ipv6hdr *iph = skb->nh.ipv6h; |
| 278 | struct inet6_skb_parm *opt = IP6CB(skb); |
| 279 | struct ipv6_destopt_hao *hao; |
| 280 | struct in6_addr tmp; |
| 281 | int off; |
| 282 | |
| 283 | if (opt->dsthao) { |
| 284 | off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); |
| 285 | if (likely(off >= 0)) { |
| 286 | hao = (struct ipv6_destopt_hao *)(skb->nh.raw + off); |
| 287 | ipv6_addr_copy(&tmp, &iph->saddr); |
| 288 | ipv6_addr_copy(&iph->saddr, &hao->addr); |
| 289 | ipv6_addr_copy(&hao->addr, &tmp); |
| 290 | } |
| 291 | } |
| 292 | } |
| 293 | #else |
| 294 | static inline void mip6_addr_swap(struct sk_buff *skb) {} |
| 295 | #endif |
| 296 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | /* |
| 298 | * Send an ICMP message in response to a packet in error |
| 299 | */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 300 | void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | struct net_device *dev) |
| 302 | { |
| 303 | struct inet6_dev *idev = NULL; |
| 304 | struct ipv6hdr *hdr = skb->nh.ipv6h; |
YOSHIFUJI Hideaki | 84427d5 | 2005-06-13 14:59:44 -0700 | [diff] [blame] | 305 | struct sock *sk; |
| 306 | struct ipv6_pinfo *np; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | struct in6_addr *saddr = NULL; |
| 308 | struct dst_entry *dst; |
| 309 | struct icmp6hdr tmp_hdr; |
| 310 | struct flowi fl; |
| 311 | struct icmpv6_msg msg; |
| 312 | int iif = 0; |
| 313 | int addr_type = 0; |
| 314 | int len; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 315 | int hlimit, tclass; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | int err = 0; |
| 317 | |
| 318 | if ((u8*)hdr < skb->head || (u8*)(hdr+1) > skb->tail) |
| 319 | return; |
| 320 | |
| 321 | /* |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 322 | * Make sure we respect the rules |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | * i.e. RFC 1885 2.4(e) |
| 324 | * Rule (e.1) is enforced by not using icmpv6_send |
| 325 | * in any code that processes icmp errors. |
| 326 | */ |
| 327 | addr_type = ipv6_addr_type(&hdr->daddr); |
| 328 | |
| 329 | if (ipv6_chk_addr(&hdr->daddr, skb->dev, 0)) |
| 330 | saddr = &hdr->daddr; |
| 331 | |
| 332 | /* |
| 333 | * Dest addr check |
| 334 | */ |
| 335 | |
| 336 | if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) { |
| 337 | if (type != ICMPV6_PKT_TOOBIG && |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 338 | !(type == ICMPV6_PARAMPROB && |
| 339 | code == ICMPV6_UNK_OPTION && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | (opt_unrec(skb, info)))) |
| 341 | return; |
| 342 | |
| 343 | saddr = NULL; |
| 344 | } |
| 345 | |
| 346 | addr_type = ipv6_addr_type(&hdr->saddr); |
| 347 | |
| 348 | /* |
| 349 | * Source addr check |
| 350 | */ |
| 351 | |
| 352 | if (addr_type & IPV6_ADDR_LINKLOCAL) |
| 353 | iif = skb->dev->ifindex; |
| 354 | |
| 355 | /* |
YOSHIFUJI Hideaki | 8de3351 | 2005-12-21 22:57:06 +0900 | [diff] [blame] | 356 | * Must not send error if the source does not uniquely |
| 357 | * identify a single node (RFC2463 Section 2.4). |
| 358 | * We check unspecified / multicast addresses here, |
| 359 | * and anycast addresses will be checked later. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | */ |
| 361 | if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 362 | LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | return; |
| 364 | } |
| 365 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 366 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | * Never answer to a ICMP packet. |
| 368 | */ |
| 369 | if (is_ineligible(skb)) { |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 370 | LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | return; |
| 372 | } |
| 373 | |
Masahide NAKAMURA | 7938323 | 2006-08-23 19:27:25 -0700 | [diff] [blame] | 374 | mip6_addr_swap(skb); |
| 375 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | memset(&fl, 0, sizeof(fl)); |
| 377 | fl.proto = IPPROTO_ICMPV6; |
| 378 | ipv6_addr_copy(&fl.fl6_dst, &hdr->saddr); |
| 379 | if (saddr) |
| 380 | ipv6_addr_copy(&fl.fl6_src, saddr); |
| 381 | fl.oif = iif; |
| 382 | fl.fl_icmp_type = type; |
| 383 | fl.fl_icmp_code = code; |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 384 | security_skb_classify_flow(skb, &fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | |
| 386 | if (icmpv6_xmit_lock()) |
| 387 | return; |
| 388 | |
YOSHIFUJI Hideaki | 84427d5 | 2005-06-13 14:59:44 -0700 | [diff] [blame] | 389 | sk = icmpv6_socket->sk; |
| 390 | np = inet6_sk(sk); |
| 391 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | if (!icmpv6_xrlim_allow(sk, type, &fl)) |
| 393 | goto out; |
| 394 | |
| 395 | tmp_hdr.icmp6_type = type; |
| 396 | tmp_hdr.icmp6_code = code; |
| 397 | tmp_hdr.icmp6_cksum = 0; |
| 398 | tmp_hdr.icmp6_pointer = htonl(info); |
| 399 | |
| 400 | if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) |
| 401 | fl.oif = np->mcast_oif; |
| 402 | |
| 403 | err = ip6_dst_lookup(sk, &dst, &fl); |
| 404 | if (err) |
| 405 | goto out; |
YOSHIFUJI Hideaki | 8de3351 | 2005-12-21 22:57:06 +0900 | [diff] [blame] | 406 | |
| 407 | /* |
| 408 | * We won't send icmp if the destination is known |
| 409 | * anycast. |
| 410 | */ |
| 411 | if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { |
| 412 | LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n"); |
| 413 | goto out_dst_release; |
| 414 | } |
| 415 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) |
Patrick McHardy | e104411 | 2005-09-08 15:11:55 -0700 | [diff] [blame] | 417 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | |
| 419 | if (ipv6_addr_is_multicast(&fl.fl6_dst)) |
| 420 | hlimit = np->mcast_hops; |
| 421 | else |
| 422 | hlimit = np->hop_limit; |
| 423 | if (hlimit < 0) |
| 424 | hlimit = dst_metric(dst, RTAX_HOPLIMIT); |
| 425 | if (hlimit < 0) |
| 426 | hlimit = ipv6_get_hoplimit(dst->dev); |
| 427 | |
YOSHIFUJI Hideaki | e012d51 | 2006-09-13 20:01:28 -0700 | [diff] [blame] | 428 | tclass = np->tclass; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 429 | if (tclass < 0) |
| 430 | tclass = 0; |
| 431 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | msg.skb = skb; |
| 433 | msg.offset = skb->nh.raw - skb->data; |
Yasuyuki Kozakai | 763ecff | 2006-02-15 15:24:15 -0800 | [diff] [blame] | 434 | msg.type = type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | |
| 436 | len = skb->len - msg.offset; |
| 437 | len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); |
| 438 | if (len < 0) { |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 439 | LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | goto out_dst_release; |
| 441 | } |
| 442 | |
| 443 | idev = in6_dev_get(skb->dev); |
| 444 | |
| 445 | err = ip6_append_data(sk, icmpv6_getfrag, &msg, |
| 446 | len + sizeof(struct icmp6hdr), |
| 447 | sizeof(struct icmp6hdr), |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 448 | hlimit, tclass, NULL, &fl, (struct rt6_info*)dst, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | MSG_DONTWAIT); |
| 450 | if (err) { |
| 451 | ip6_flush_pending_frames(sk); |
| 452 | goto out_put; |
| 453 | } |
| 454 | err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, len + sizeof(struct icmp6hdr)); |
| 455 | |
| 456 | if (type >= ICMPV6_DEST_UNREACH && type <= ICMPV6_PARAMPROB) |
| 457 | ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_OUTDESTUNREACHS, type - ICMPV6_DEST_UNREACH); |
| 458 | ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS); |
| 459 | |
| 460 | out_put: |
| 461 | if (likely(idev != NULL)) |
| 462 | in6_dev_put(idev); |
| 463 | out_dst_release: |
| 464 | dst_release(dst); |
| 465 | out: |
| 466 | icmpv6_xmit_unlock(); |
| 467 | } |
| 468 | |
| 469 | static void icmpv6_echo_reply(struct sk_buff *skb) |
| 470 | { |
YOSHIFUJI Hideaki | 84427d5 | 2005-06-13 14:59:44 -0700 | [diff] [blame] | 471 | struct sock *sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | struct inet6_dev *idev; |
YOSHIFUJI Hideaki | 84427d5 | 2005-06-13 14:59:44 -0700 | [diff] [blame] | 473 | struct ipv6_pinfo *np; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | struct in6_addr *saddr = NULL; |
| 475 | struct icmp6hdr *icmph = (struct icmp6hdr *) skb->h.raw; |
| 476 | struct icmp6hdr tmp_hdr; |
| 477 | struct flowi fl; |
| 478 | struct icmpv6_msg msg; |
| 479 | struct dst_entry *dst; |
| 480 | int err = 0; |
| 481 | int hlimit; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 482 | int tclass; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | |
| 484 | saddr = &skb->nh.ipv6h->daddr; |
| 485 | |
| 486 | if (!ipv6_unicast_destination(skb)) |
| 487 | saddr = NULL; |
| 488 | |
| 489 | memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); |
| 490 | tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; |
| 491 | |
| 492 | memset(&fl, 0, sizeof(fl)); |
| 493 | fl.proto = IPPROTO_ICMPV6; |
| 494 | ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); |
| 495 | if (saddr) |
| 496 | ipv6_addr_copy(&fl.fl6_src, saddr); |
| 497 | fl.oif = skb->dev->ifindex; |
| 498 | fl.fl_icmp_type = ICMPV6_ECHO_REPLY; |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 499 | security_skb_classify_flow(skb, &fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | |
| 501 | if (icmpv6_xmit_lock()) |
| 502 | return; |
| 503 | |
YOSHIFUJI Hideaki | 84427d5 | 2005-06-13 14:59:44 -0700 | [diff] [blame] | 504 | sk = icmpv6_socket->sk; |
| 505 | np = inet6_sk(sk); |
| 506 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) |
| 508 | fl.oif = np->mcast_oif; |
| 509 | |
| 510 | err = ip6_dst_lookup(sk, &dst, &fl); |
| 511 | if (err) |
| 512 | goto out; |
| 513 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) |
Patrick McHardy | e104411 | 2005-09-08 15:11:55 -0700 | [diff] [blame] | 514 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | |
| 516 | if (ipv6_addr_is_multicast(&fl.fl6_dst)) |
| 517 | hlimit = np->mcast_hops; |
| 518 | else |
| 519 | hlimit = np->hop_limit; |
| 520 | if (hlimit < 0) |
| 521 | hlimit = dst_metric(dst, RTAX_HOPLIMIT); |
| 522 | if (hlimit < 0) |
| 523 | hlimit = ipv6_get_hoplimit(dst->dev); |
| 524 | |
YOSHIFUJI Hideaki | e012d51 | 2006-09-13 20:01:28 -0700 | [diff] [blame] | 525 | tclass = np->tclass; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 526 | if (tclass < 0) |
| 527 | tclass = 0; |
| 528 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | idev = in6_dev_get(skb->dev); |
| 530 | |
| 531 | msg.skb = skb; |
| 532 | msg.offset = 0; |
Yasuyuki Kozakai | 763ecff | 2006-02-15 15:24:15 -0800 | [diff] [blame] | 533 | msg.type = ICMPV6_ECHO_REPLY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | |
| 535 | 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] | 536 | sizeof(struct icmp6hdr), hlimit, tclass, NULL, &fl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | (struct rt6_info*)dst, MSG_DONTWAIT); |
| 538 | |
| 539 | if (err) { |
| 540 | ip6_flush_pending_frames(sk); |
| 541 | goto out_put; |
| 542 | } |
| 543 | err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, skb->len + sizeof(struct icmp6hdr)); |
| 544 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 545 | ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTECHOREPLIES); |
| 546 | ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 548 | out_put: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | if (likely(idev != NULL)) |
| 550 | in6_dev_put(idev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | dst_release(dst); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 552 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | icmpv6_xmit_unlock(); |
| 554 | } |
| 555 | |
Al Viro | 04ce690 | 2006-11-08 00:21:01 -0800 | [diff] [blame] | 556 | 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] | 557 | { |
| 558 | struct in6_addr *saddr, *daddr; |
| 559 | struct inet6_protocol *ipprot; |
| 560 | struct sock *sk; |
| 561 | int inner_offset; |
| 562 | int hash; |
| 563 | u8 nexthdr; |
| 564 | |
| 565 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
| 566 | return; |
| 567 | |
| 568 | nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; |
| 569 | if (ipv6_ext_hdr(nexthdr)) { |
| 570 | /* now skip over extension headers */ |
Herbert Xu | 0d3d077 | 2005-04-24 20:16:19 -0700 | [diff] [blame] | 571 | inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | if (inner_offset<0) |
| 573 | return; |
| 574 | } else { |
| 575 | inner_offset = sizeof(struct ipv6hdr); |
| 576 | } |
| 577 | |
| 578 | /* Checkin header including 8 bytes of inner protocol header. */ |
| 579 | if (!pskb_may_pull(skb, inner_offset+8)) |
| 580 | return; |
| 581 | |
| 582 | saddr = &skb->nh.ipv6h->saddr; |
| 583 | daddr = &skb->nh.ipv6h->daddr; |
| 584 | |
| 585 | /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. |
| 586 | Without this we will not able f.e. to make source routed |
| 587 | pmtu discovery. |
| 588 | Corresponding argument (opt) to notifiers is already added. |
| 589 | --ANK (980726) |
| 590 | */ |
| 591 | |
| 592 | hash = nexthdr & (MAX_INET_PROTOS - 1); |
| 593 | |
| 594 | rcu_read_lock(); |
| 595 | ipprot = rcu_dereference(inet6_protos[hash]); |
| 596 | if (ipprot && ipprot->err_handler) |
| 597 | ipprot->err_handler(skb, NULL, type, code, inner_offset, info); |
| 598 | rcu_read_unlock(); |
| 599 | |
| 600 | read_lock(&raw_v6_lock); |
| 601 | if ((sk = sk_head(&raw_v6_htable[hash])) != NULL) { |
Andrew McDonald | 0bd1b59 | 2005-08-09 19:44:42 -0700 | [diff] [blame] | 602 | while((sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr, |
YOSHIFUJI Hideaki | 2dac4b9 | 2005-09-01 17:44:49 -0700 | [diff] [blame] | 603 | IP6CB(skb)->iif))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | rawv6_err(sk, skb, NULL, type, code, inner_offset, info); |
| 605 | sk = sk_next(sk); |
| 606 | } |
| 607 | } |
| 608 | read_unlock(&raw_v6_lock); |
| 609 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 610 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | /* |
| 612 | * Handle icmp messages |
| 613 | */ |
| 614 | |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 615 | static int icmpv6_rcv(struct sk_buff **pskb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | { |
| 617 | struct sk_buff *skb = *pskb; |
| 618 | struct net_device *dev = skb->dev; |
| 619 | struct inet6_dev *idev = __in6_dev_get(dev); |
| 620 | struct in6_addr *saddr, *daddr; |
| 621 | struct ipv6hdr *orig_hdr; |
| 622 | struct icmp6hdr *hdr; |
| 623 | int type; |
| 624 | |
| 625 | ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INMSGS); |
| 626 | |
| 627 | saddr = &skb->nh.ipv6h->saddr; |
| 628 | daddr = &skb->nh.ipv6h->daddr; |
| 629 | |
| 630 | /* Perform checksum. */ |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 631 | switch (skb->ip_summed) { |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 632 | case CHECKSUM_COMPLETE: |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 633 | if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, |
| 634 | skb->csum)) |
| 635 | break; |
| 636 | /* fall through */ |
| 637 | case CHECKSUM_NONE: |
Al Viro | 868c86b | 2006-11-14 21:35:48 -0800 | [diff] [blame] | 638 | skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len, |
| 639 | IPPROTO_ICMPV6, 0)); |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 640 | if (__skb_checksum_complete(skb)) { |
Joe Perches | 46b86a2 | 2006-01-13 14:29:07 -0800 | [diff] [blame] | 641 | LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [" NIP6_FMT " > " NIP6_FMT "]\n", |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 642 | NIP6(*saddr), NIP6(*daddr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | goto discard_it; |
| 644 | } |
| 645 | } |
| 646 | |
| 647 | if (!pskb_pull(skb, sizeof(struct icmp6hdr))) |
| 648 | goto discard_it; |
| 649 | |
| 650 | hdr = (struct icmp6hdr *) skb->h.raw; |
| 651 | |
| 652 | type = hdr->icmp6_type; |
| 653 | |
| 654 | if (type >= ICMPV6_DEST_UNREACH && type <= ICMPV6_PARAMPROB) |
| 655 | ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_INDESTUNREACHS, type - ICMPV6_DEST_UNREACH); |
| 656 | else if (type >= ICMPV6_ECHO_REQUEST && type <= NDISC_REDIRECT) |
| 657 | ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_INECHOS, type - ICMPV6_ECHO_REQUEST); |
| 658 | |
| 659 | switch (type) { |
| 660 | case ICMPV6_ECHO_REQUEST: |
| 661 | icmpv6_echo_reply(skb); |
| 662 | break; |
| 663 | |
| 664 | case ICMPV6_ECHO_REPLY: |
| 665 | /* we couldn't care less */ |
| 666 | break; |
| 667 | |
| 668 | case ICMPV6_PKT_TOOBIG: |
| 669 | /* BUGGG_FUTURE: if packet contains rthdr, we cannot update |
| 670 | standard destination cache. Seems, only "advanced" |
| 671 | destination cache will allow to solve this problem |
| 672 | --ANK (980726) |
| 673 | */ |
| 674 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
| 675 | goto discard_it; |
| 676 | hdr = (struct icmp6hdr *) skb->h.raw; |
| 677 | orig_hdr = (struct ipv6hdr *) (hdr + 1); |
| 678 | rt6_pmtu_discovery(&orig_hdr->daddr, &orig_hdr->saddr, dev, |
| 679 | ntohl(hdr->icmp6_mtu)); |
| 680 | |
| 681 | /* |
| 682 | * Drop through to notify |
| 683 | */ |
| 684 | |
| 685 | case ICMPV6_DEST_UNREACH: |
| 686 | case ICMPV6_TIME_EXCEED: |
| 687 | case ICMPV6_PARAMPROB: |
| 688 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); |
| 689 | break; |
| 690 | |
| 691 | case NDISC_ROUTER_SOLICITATION: |
| 692 | case NDISC_ROUTER_ADVERTISEMENT: |
| 693 | case NDISC_NEIGHBOUR_SOLICITATION: |
| 694 | case NDISC_NEIGHBOUR_ADVERTISEMENT: |
| 695 | case NDISC_REDIRECT: |
| 696 | ndisc_rcv(skb); |
| 697 | break; |
| 698 | |
| 699 | case ICMPV6_MGM_QUERY: |
| 700 | igmp6_event_query(skb); |
| 701 | break; |
| 702 | |
| 703 | case ICMPV6_MGM_REPORT: |
| 704 | igmp6_event_report(skb); |
| 705 | break; |
| 706 | |
| 707 | case ICMPV6_MGM_REDUCTION: |
| 708 | case ICMPV6_NI_QUERY: |
| 709 | case ICMPV6_NI_REPLY: |
| 710 | case ICMPV6_MLD2_REPORT: |
| 711 | case ICMPV6_DHAAD_REQUEST: |
| 712 | case ICMPV6_DHAAD_REPLY: |
| 713 | case ICMPV6_MOBILE_PREFIX_SOL: |
| 714 | case ICMPV6_MOBILE_PREFIX_ADV: |
| 715 | break; |
| 716 | |
| 717 | default: |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 718 | LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | |
| 720 | /* informational */ |
| 721 | if (type & ICMPV6_INFOMSG_MASK) |
| 722 | break; |
| 723 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 724 | /* |
| 725 | * error of unknown type. |
| 726 | * must pass to upper level |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | */ |
| 728 | |
| 729 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); |
| 730 | }; |
| 731 | kfree_skb(skb); |
| 732 | return 0; |
| 733 | |
| 734 | discard_it: |
| 735 | ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS); |
| 736 | kfree_skb(skb); |
| 737 | return 0; |
| 738 | } |
| 739 | |
Ingo Molnar | 640c41c | 2006-08-15 00:06:56 -0700 | [diff] [blame] | 740 | /* |
| 741 | * Special lock-class for __icmpv6_socket: |
| 742 | */ |
| 743 | static struct lock_class_key icmpv6_socket_sk_dst_lock_key; |
| 744 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | int __init icmpv6_init(struct net_proto_family *ops) |
| 746 | { |
| 747 | struct sock *sk; |
| 748 | int err, i, j; |
| 749 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 750 | for_each_possible_cpu(i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, |
| 752 | &per_cpu(__icmpv6_socket, i)); |
| 753 | if (err < 0) { |
| 754 | printk(KERN_ERR |
| 755 | "Failed to initialize the ICMP6 control socket " |
| 756 | "(err %d).\n", |
| 757 | err); |
| 758 | goto fail; |
| 759 | } |
| 760 | |
| 761 | sk = per_cpu(__icmpv6_socket, i)->sk; |
| 762 | sk->sk_allocation = GFP_ATOMIC; |
Ingo Molnar | 640c41c | 2006-08-15 00:06:56 -0700 | [diff] [blame] | 763 | /* |
| 764 | * Split off their lock-class, because sk->sk_dst_lock |
| 765 | * gets used from softirqs, which is safe for |
| 766 | * __icmpv6_socket (because those never get directly used |
| 767 | * via userspace syscalls), but unsafe for normal sockets. |
| 768 | */ |
| 769 | lockdep_set_class(&sk->sk_dst_lock, |
| 770 | &icmpv6_socket_sk_dst_lock_key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | |
| 772 | /* Enough space for 2 64K ICMP packets, including |
| 773 | * sk_buff struct overhead. |
| 774 | */ |
| 775 | sk->sk_sndbuf = |
| 776 | (2 * ((64 * 1024) + sizeof(struct sk_buff))); |
| 777 | |
| 778 | sk->sk_prot->unhash(sk); |
| 779 | } |
| 780 | |
| 781 | |
| 782 | if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) { |
| 783 | printk(KERN_ERR "Failed to register ICMP6 protocol\n"); |
| 784 | err = -EAGAIN; |
| 785 | goto fail; |
| 786 | } |
| 787 | |
| 788 | return 0; |
| 789 | |
| 790 | fail: |
| 791 | for (j = 0; j < i; j++) { |
| 792 | if (!cpu_possible(j)) |
| 793 | continue; |
| 794 | sock_release(per_cpu(__icmpv6_socket, j)); |
| 795 | } |
| 796 | |
| 797 | return err; |
| 798 | } |
| 799 | |
| 800 | void icmpv6_cleanup(void) |
| 801 | { |
| 802 | int i; |
| 803 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 804 | for_each_possible_cpu(i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | sock_release(per_cpu(__icmpv6_socket, i)); |
| 806 | } |
| 807 | inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); |
| 808 | } |
| 809 | |
Arjan van de Ven | 9b5b5cf | 2005-11-29 16:21:38 -0800 | [diff] [blame] | 810 | static const struct icmp6_err { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | int err; |
| 812 | int fatal; |
| 813 | } tab_unreach[] = { |
| 814 | { /* NOROUTE */ |
| 815 | .err = ENETUNREACH, |
| 816 | .fatal = 0, |
| 817 | }, |
| 818 | { /* ADM_PROHIBITED */ |
| 819 | .err = EACCES, |
| 820 | .fatal = 1, |
| 821 | }, |
| 822 | { /* Was NOT_NEIGHBOUR, now reserved */ |
| 823 | .err = EHOSTUNREACH, |
| 824 | .fatal = 0, |
| 825 | }, |
| 826 | { /* ADDR_UNREACH */ |
| 827 | .err = EHOSTUNREACH, |
| 828 | .fatal = 0, |
| 829 | }, |
| 830 | { /* PORT_UNREACH */ |
| 831 | .err = ECONNREFUSED, |
| 832 | .fatal = 1, |
| 833 | }, |
| 834 | }; |
| 835 | |
| 836 | int icmpv6_err_convert(int type, int code, int *err) |
| 837 | { |
| 838 | int fatal = 0; |
| 839 | |
| 840 | *err = EPROTO; |
| 841 | |
| 842 | switch (type) { |
| 843 | case ICMPV6_DEST_UNREACH: |
| 844 | fatal = 1; |
| 845 | if (code <= ICMPV6_PORT_UNREACH) { |
| 846 | *err = tab_unreach[code].err; |
| 847 | fatal = tab_unreach[code].fatal; |
| 848 | } |
| 849 | break; |
| 850 | |
| 851 | case ICMPV6_PKT_TOOBIG: |
| 852 | *err = EMSGSIZE; |
| 853 | break; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 854 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | case ICMPV6_PARAMPROB: |
| 856 | *err = EPROTO; |
| 857 | fatal = 1; |
| 858 | break; |
| 859 | |
| 860 | case ICMPV6_TIME_EXCEED: |
| 861 | *err = EHOSTUNREACH; |
| 862 | break; |
| 863 | }; |
| 864 | |
| 865 | return fatal; |
| 866 | } |
| 867 | |
| 868 | #ifdef CONFIG_SYSCTL |
| 869 | ctl_table ipv6_icmp_table[] = { |
| 870 | { |
| 871 | .ctl_name = NET_IPV6_ICMP_RATELIMIT, |
| 872 | .procname = "ratelimit", |
| 873 | .data = &sysctl_icmpv6_time, |
| 874 | .maxlen = sizeof(int), |
| 875 | .mode = 0644, |
| 876 | .proc_handler = &proc_dointvec |
| 877 | }, |
| 878 | { .ctl_name = 0 }, |
| 879 | }; |
| 880 | #endif |
| 881 | |