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> |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 66 | #include <net/xfrm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
YOSHIFUJI Hideaki | 7159039 | 2007-02-22 22:05:40 +0900 | [diff] [blame] | 72 | EXPORT_SYMBOL(icmpv6_statistics); |
David L Stevens | 14878f7 | 2007-09-16 16:52:35 -0700 | [diff] [blame] | 73 | DEFINE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics) __read_mostly; |
| 74 | EXPORT_SYMBOL(icmpv6msg_statistics); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
| 76 | /* |
| 77 | * The ICMP socket(s). This is the most convenient way to flow control |
| 78 | * our ICMP output as well as maintain a clean interface throughout |
| 79 | * all layers. All Socketless IP sends will soon be gone. |
| 80 | * |
| 81 | * On SMP we have one ICMP socket per-cpu. |
| 82 | */ |
| 83 | static DEFINE_PER_CPU(struct socket *, __icmpv6_socket) = NULL; |
| 84 | #define icmpv6_socket __get_cpu_var(__icmpv6_socket) |
| 85 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 86 | static int icmpv6_rcv(struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
| 88 | static struct inet6_protocol icmpv6_protocol = { |
| 89 | .handler = icmpv6_rcv, |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 90 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | }; |
| 92 | |
| 93 | static __inline__ int icmpv6_xmit_lock(void) |
| 94 | { |
| 95 | local_bh_disable(); |
| 96 | |
| 97 | if (unlikely(!spin_trylock(&icmpv6_socket->sk->sk_lock.slock))) { |
| 98 | /* This can happen if the output path (f.e. SIT or |
| 99 | * ip6ip6 tunnel) signals dst_link_failure() for an |
| 100 | * outgoing ICMP6 packet. |
| 101 | */ |
| 102 | local_bh_enable(); |
| 103 | return 1; |
| 104 | } |
| 105 | return 0; |
| 106 | } |
| 107 | |
| 108 | static __inline__ void icmpv6_xmit_unlock(void) |
| 109 | { |
| 110 | spin_unlock_bh(&icmpv6_socket->sk->sk_lock.slock); |
| 111 | } |
| 112 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 113 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | * Slightly more convenient version of icmpv6_send. |
| 115 | */ |
| 116 | void icmpv6_param_prob(struct sk_buff *skb, int code, int pos) |
| 117 | { |
| 118 | icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos, skb->dev); |
| 119 | kfree_skb(skb); |
| 120 | } |
| 121 | |
| 122 | /* |
| 123 | * Figure out, may we reply to this packet with icmp error. |
| 124 | * |
| 125 | * We do not reply, if: |
| 126 | * - it was icmp error message. |
| 127 | * - it is truncated, so that it is known, that protocol is ICMPV6 |
| 128 | * (i.e. in the middle of some exthdr) |
| 129 | * |
| 130 | * --ANK (980726) |
| 131 | */ |
| 132 | |
| 133 | static int is_ineligible(struct sk_buff *skb) |
| 134 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 135 | int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | int len = skb->len - ptr; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 137 | __u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | |
| 139 | if (len < 0) |
| 140 | return 1; |
| 141 | |
Herbert Xu | 0d3d077 | 2005-04-24 20:16:19 -0700 | [diff] [blame] | 142 | ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | if (ptr < 0) |
| 144 | return 0; |
| 145 | if (nexthdr == IPPROTO_ICMPV6) { |
| 146 | u8 _type, *tp; |
| 147 | tp = skb_header_pointer(skb, |
| 148 | ptr+offsetof(struct icmp6hdr, icmp6_type), |
| 149 | sizeof(_type), &_type); |
| 150 | if (tp == NULL || |
| 151 | !(*tp & ICMPV6_INFOMSG_MASK)) |
| 152 | return 1; |
| 153 | } |
| 154 | return 0; |
| 155 | } |
| 156 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 157 | /* |
| 158 | * Check the ICMP output rate limit |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | */ |
| 160 | static inline int icmpv6_xrlim_allow(struct sock *sk, int type, |
| 161 | struct flowi *fl) |
| 162 | { |
| 163 | struct dst_entry *dst; |
| 164 | int res = 0; |
| 165 | |
| 166 | /* Informational messages are not limited. */ |
| 167 | if (type & ICMPV6_INFOMSG_MASK) |
| 168 | return 1; |
| 169 | |
| 170 | /* Do not limit pmtu discovery, it would break it. */ |
| 171 | if (type == ICMPV6_PKT_TOOBIG) |
| 172 | return 1; |
| 173 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 174 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | * Look up the output route. |
| 176 | * XXX: perhaps the expire for routing entries cloned by |
| 177 | * this lookup should be more aggressive (not longer than timeout). |
| 178 | */ |
| 179 | dst = ip6_route_output(sk, fl); |
| 180 | if (dst->error) { |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 181 | IP6_INC_STATS(ip6_dst_idev(dst), |
| 182 | IPSTATS_MIB_OUTNOROUTES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { |
| 184 | res = 1; |
| 185 | } else { |
| 186 | struct rt6_info *rt = (struct rt6_info *)dst; |
Daniel Lezcano | 41a7690 | 2008-01-10 03:02:40 -0800 | [diff] [blame] | 187 | int tmo = init_net.ipv6.sysctl.icmpv6_time; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | |
| 189 | /* Give more bandwidth to wider prefixes. */ |
| 190 | if (rt->rt6i_dst.plen < 128) |
| 191 | tmo >>= ((128 - rt->rt6i_dst.plen)>>5); |
| 192 | |
| 193 | res = xrlim_allow(dst, tmo); |
| 194 | } |
| 195 | dst_release(dst); |
| 196 | return res; |
| 197 | } |
| 198 | |
| 199 | /* |
| 200 | * an inline helper for the "simple" if statement below |
| 201 | * checks if parameter problem report is caused by an |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 202 | * unrecognized IPv6 option that has the Option Type |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | * highest-order two bits set to 10 |
| 204 | */ |
| 205 | |
| 206 | static __inline__ int opt_unrec(struct sk_buff *skb, __u32 offset) |
| 207 | { |
| 208 | u8 _optval, *op; |
| 209 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 210 | offset += skb_network_offset(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); |
| 212 | if (op == NULL) |
| 213 | return 1; |
| 214 | return (*op & 0xC0) == 0x80; |
| 215 | } |
| 216 | |
| 217 | static int icmpv6_push_pending_frames(struct sock *sk, struct flowi *fl, struct icmp6hdr *thdr, int len) |
| 218 | { |
| 219 | struct sk_buff *skb; |
| 220 | struct icmp6hdr *icmp6h; |
| 221 | int err = 0; |
| 222 | |
| 223 | if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) |
| 224 | goto out; |
| 225 | |
Arnaldo Carvalho de Melo | cc70ab2 | 2007-03-13 14:03:22 -0300 | [diff] [blame] | 226 | icmp6h = icmp6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); |
| 228 | icmp6h->icmp6_cksum = 0; |
| 229 | |
| 230 | if (skb_queue_len(&sk->sk_write_queue) == 1) { |
| 231 | skb->csum = csum_partial((char *)icmp6h, |
| 232 | sizeof(struct icmp6hdr), skb->csum); |
| 233 | icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src, |
| 234 | &fl->fl6_dst, |
| 235 | len, fl->proto, |
| 236 | skb->csum); |
| 237 | } else { |
Al Viro | 868c86b | 2006-11-14 21:35:48 -0800 | [diff] [blame] | 238 | __wsum tmp_csum = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | |
| 240 | skb_queue_walk(&sk->sk_write_queue, skb) { |
| 241 | tmp_csum = csum_add(tmp_csum, skb->csum); |
| 242 | } |
| 243 | |
| 244 | tmp_csum = csum_partial((char *)icmp6h, |
| 245 | sizeof(struct icmp6hdr), tmp_csum); |
Al Viro | 868c86b | 2006-11-14 21:35:48 -0800 | [diff] [blame] | 246 | icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src, |
| 247 | &fl->fl6_dst, |
| 248 | len, fl->proto, |
| 249 | tmp_csum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Al Viro | 5f92a73 | 2006-11-14 21:36:54 -0800 | [diff] [blame] | 266 | __wsum csum = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | 59fbb3a6 | 2007-06-26 23:56:32 -0700 | [diff] [blame] | 276 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
Masahide NAKAMURA | 7938323 | 2006-08-23 19:27:25 -0700 | [diff] [blame] | 277 | static void mip6_addr_swap(struct sk_buff *skb) |
| 278 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 279 | struct ipv6hdr *iph = ipv6_hdr(skb); |
Masahide NAKAMURA | 7938323 | 2006-08-23 19:27:25 -0700 | [diff] [blame] | 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)) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 288 | hao = (struct ipv6_destopt_hao *) |
| 289 | (skb_network_header(skb) + off); |
Masahide NAKAMURA | 7938323 | 2006-08-23 19:27:25 -0700 | [diff] [blame] | 290 | ipv6_addr_copy(&tmp, &iph->saddr); |
| 291 | ipv6_addr_copy(&iph->saddr, &hao->addr); |
| 292 | ipv6_addr_copy(&hao->addr, &tmp); |
| 293 | } |
| 294 | } |
| 295 | } |
| 296 | #else |
| 297 | static inline void mip6_addr_swap(struct sk_buff *skb) {} |
| 298 | #endif |
| 299 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | /* |
| 301 | * Send an ICMP message in response to a packet in error |
| 302 | */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 303 | 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] | 304 | struct net_device *dev) |
| 305 | { |
| 306 | struct inet6_dev *idev = NULL; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 307 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
YOSHIFUJI Hideaki | 84427d5 | 2005-06-13 14:59:44 -0700 | [diff] [blame] | 308 | struct sock *sk; |
| 309 | struct ipv6_pinfo *np; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | struct in6_addr *saddr = NULL; |
| 311 | struct dst_entry *dst; |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 312 | struct dst_entry *dst2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | struct icmp6hdr tmp_hdr; |
| 314 | struct flowi fl; |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 315 | struct flowi fl2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | struct icmpv6_msg msg; |
| 317 | int iif = 0; |
| 318 | int addr_type = 0; |
| 319 | int len; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 320 | int hlimit, tclass; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | int err = 0; |
| 322 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 323 | if ((u8 *)hdr < skb->head || |
| 324 | (skb->network_header + sizeof(*hdr)) > skb->tail) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | return; |
| 326 | |
| 327 | /* |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 328 | * Make sure we respect the rules |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | * i.e. RFC 1885 2.4(e) |
| 330 | * Rule (e.1) is enforced by not using icmpv6_send |
| 331 | * in any code that processes icmp errors. |
| 332 | */ |
| 333 | addr_type = ipv6_addr_type(&hdr->daddr); |
| 334 | |
Daniel Lezcano | bfeade0 | 2008-01-10 22:43:18 -0800 | [diff] [blame^] | 335 | if (ipv6_chk_addr(&init_net, &hdr->daddr, skb->dev, 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | saddr = &hdr->daddr; |
| 337 | |
| 338 | /* |
| 339 | * Dest addr check |
| 340 | */ |
| 341 | |
| 342 | if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) { |
| 343 | if (type != ICMPV6_PKT_TOOBIG && |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 344 | !(type == ICMPV6_PARAMPROB && |
| 345 | code == ICMPV6_UNK_OPTION && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | (opt_unrec(skb, info)))) |
| 347 | return; |
| 348 | |
| 349 | saddr = NULL; |
| 350 | } |
| 351 | |
| 352 | addr_type = ipv6_addr_type(&hdr->saddr); |
| 353 | |
| 354 | /* |
| 355 | * Source addr check |
| 356 | */ |
| 357 | |
| 358 | if (addr_type & IPV6_ADDR_LINKLOCAL) |
| 359 | iif = skb->dev->ifindex; |
| 360 | |
| 361 | /* |
YOSHIFUJI Hideaki | 8de3351 | 2005-12-21 22:57:06 +0900 | [diff] [blame] | 362 | * Must not send error if the source does not uniquely |
| 363 | * identify a single node (RFC2463 Section 2.4). |
| 364 | * We check unspecified / multicast addresses here, |
| 365 | * and anycast addresses will be checked later. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | */ |
| 367 | if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 368 | LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | return; |
| 370 | } |
| 371 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 372 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | * Never answer to a ICMP packet. |
| 374 | */ |
| 375 | if (is_ineligible(skb)) { |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 376 | LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | return; |
| 378 | } |
| 379 | |
Masahide NAKAMURA | 7938323 | 2006-08-23 19:27:25 -0700 | [diff] [blame] | 380 | mip6_addr_swap(skb); |
| 381 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | memset(&fl, 0, sizeof(fl)); |
| 383 | fl.proto = IPPROTO_ICMPV6; |
| 384 | ipv6_addr_copy(&fl.fl6_dst, &hdr->saddr); |
| 385 | if (saddr) |
| 386 | ipv6_addr_copy(&fl.fl6_src, saddr); |
| 387 | fl.oif = iif; |
| 388 | fl.fl_icmp_type = type; |
| 389 | fl.fl_icmp_code = code; |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 390 | security_skb_classify_flow(skb, &fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | |
| 392 | if (icmpv6_xmit_lock()) |
| 393 | return; |
| 394 | |
YOSHIFUJI Hideaki | 84427d5 | 2005-06-13 14:59:44 -0700 | [diff] [blame] | 395 | sk = icmpv6_socket->sk; |
| 396 | np = inet6_sk(sk); |
| 397 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | if (!icmpv6_xrlim_allow(sk, type, &fl)) |
| 399 | goto out; |
| 400 | |
| 401 | tmp_hdr.icmp6_type = type; |
| 402 | tmp_hdr.icmp6_code = code; |
| 403 | tmp_hdr.icmp6_cksum = 0; |
| 404 | tmp_hdr.icmp6_pointer = htonl(info); |
| 405 | |
| 406 | if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) |
| 407 | fl.oif = np->mcast_oif; |
| 408 | |
| 409 | err = ip6_dst_lookup(sk, &dst, &fl); |
| 410 | if (err) |
| 411 | goto out; |
YOSHIFUJI Hideaki | 8de3351 | 2005-12-21 22:57:06 +0900 | [diff] [blame] | 412 | |
| 413 | /* |
| 414 | * We won't send icmp if the destination is known |
| 415 | * anycast. |
| 416 | */ |
| 417 | if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { |
| 418 | LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n"); |
| 419 | goto out_dst_release; |
| 420 | } |
| 421 | |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 422 | /* No need to clone since we're just using its address. */ |
| 423 | dst2 = dst; |
| 424 | |
| 425 | err = xfrm_lookup(&dst, &fl, sk, 0); |
| 426 | switch (err) { |
| 427 | case 0: |
| 428 | if (dst != dst2) |
| 429 | goto route_done; |
| 430 | break; |
| 431 | case -EPERM: |
| 432 | dst = NULL; |
| 433 | break; |
| 434 | default: |
| 435 | goto out; |
| 436 | } |
| 437 | |
| 438 | if (xfrm_decode_session_reverse(skb, &fl2, AF_INET6)) |
Patrick McHardy | e104411b | 2005-09-08 15:11:55 -0700 | [diff] [blame] | 439 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 441 | if (ip6_dst_lookup(sk, &dst2, &fl)) |
| 442 | goto out; |
| 443 | |
| 444 | err = xfrm_lookup(&dst2, &fl, sk, XFRM_LOOKUP_ICMP); |
| 445 | if (err == -ENOENT) { |
| 446 | if (!dst) |
| 447 | goto out; |
| 448 | goto route_done; |
| 449 | } |
| 450 | |
| 451 | dst_release(dst); |
| 452 | dst = dst2; |
| 453 | |
| 454 | if (err) |
| 455 | goto out; |
| 456 | |
| 457 | route_done: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | if (ipv6_addr_is_multicast(&fl.fl6_dst)) |
| 459 | hlimit = np->mcast_hops; |
| 460 | else |
| 461 | hlimit = np->hop_limit; |
| 462 | if (hlimit < 0) |
| 463 | hlimit = dst_metric(dst, RTAX_HOPLIMIT); |
| 464 | if (hlimit < 0) |
| 465 | hlimit = ipv6_get_hoplimit(dst->dev); |
| 466 | |
YOSHIFUJI Hideaki | e012d51 | 2006-09-13 20:01:28 -0700 | [diff] [blame] | 467 | tclass = np->tclass; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 468 | if (tclass < 0) |
| 469 | tclass = 0; |
| 470 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | msg.skb = skb; |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 472 | msg.offset = skb_network_offset(skb); |
Yasuyuki Kozakai | 763ecff | 2006-02-15 15:24:15 -0800 | [diff] [blame] | 473 | msg.type = type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | |
| 475 | len = skb->len - msg.offset; |
| 476 | len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); |
| 477 | if (len < 0) { |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 478 | LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | goto out_dst_release; |
| 480 | } |
| 481 | |
| 482 | idev = in6_dev_get(skb->dev); |
| 483 | |
| 484 | err = ip6_append_data(sk, icmpv6_getfrag, &msg, |
| 485 | len + sizeof(struct icmp6hdr), |
| 486 | sizeof(struct icmp6hdr), |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 487 | hlimit, tclass, NULL, &fl, (struct rt6_info*)dst, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | MSG_DONTWAIT); |
| 489 | if (err) { |
| 490 | ip6_flush_pending_frames(sk); |
| 491 | goto out_put; |
| 492 | } |
| 493 | err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, len + sizeof(struct icmp6hdr)); |
| 494 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | out_put: |
| 496 | if (likely(idev != NULL)) |
| 497 | in6_dev_put(idev); |
| 498 | out_dst_release: |
| 499 | dst_release(dst); |
| 500 | out: |
| 501 | icmpv6_xmit_unlock(); |
| 502 | } |
| 503 | |
YOSHIFUJI Hideaki | 7159039 | 2007-02-22 22:05:40 +0900 | [diff] [blame] | 504 | EXPORT_SYMBOL(icmpv6_send); |
| 505 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | static void icmpv6_echo_reply(struct sk_buff *skb) |
| 507 | { |
YOSHIFUJI Hideaki | 84427d5 | 2005-06-13 14:59:44 -0700 | [diff] [blame] | 508 | struct sock *sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | struct inet6_dev *idev; |
YOSHIFUJI Hideaki | 84427d5 | 2005-06-13 14:59:44 -0700 | [diff] [blame] | 510 | struct ipv6_pinfo *np; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | struct in6_addr *saddr = NULL; |
Arnaldo Carvalho de Melo | cc70ab2 | 2007-03-13 14:03:22 -0300 | [diff] [blame] | 512 | struct icmp6hdr *icmph = icmp6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | struct icmp6hdr tmp_hdr; |
| 514 | struct flowi fl; |
| 515 | struct icmpv6_msg msg; |
| 516 | struct dst_entry *dst; |
| 517 | int err = 0; |
| 518 | int hlimit; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 519 | int tclass; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 521 | saddr = &ipv6_hdr(skb)->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | |
| 523 | if (!ipv6_unicast_destination(skb)) |
| 524 | saddr = NULL; |
| 525 | |
| 526 | memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); |
| 527 | tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; |
| 528 | |
| 529 | memset(&fl, 0, sizeof(fl)); |
| 530 | fl.proto = IPPROTO_ICMPV6; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 531 | ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | if (saddr) |
| 533 | ipv6_addr_copy(&fl.fl6_src, saddr); |
| 534 | fl.oif = skb->dev->ifindex; |
| 535 | fl.fl_icmp_type = ICMPV6_ECHO_REPLY; |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 536 | security_skb_classify_flow(skb, &fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | |
| 538 | if (icmpv6_xmit_lock()) |
| 539 | return; |
| 540 | |
YOSHIFUJI Hideaki | 84427d5 | 2005-06-13 14:59:44 -0700 | [diff] [blame] | 541 | sk = icmpv6_socket->sk; |
| 542 | np = inet6_sk(sk); |
| 543 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) |
| 545 | fl.oif = np->mcast_oif; |
| 546 | |
| 547 | err = ip6_dst_lookup(sk, &dst, &fl); |
| 548 | if (err) |
| 549 | goto out; |
| 550 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) |
Patrick McHardy | e104411b | 2005-09-08 15:11:55 -0700 | [diff] [blame] | 551 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | |
| 553 | if (ipv6_addr_is_multicast(&fl.fl6_dst)) |
| 554 | hlimit = np->mcast_hops; |
| 555 | else |
| 556 | hlimit = np->hop_limit; |
| 557 | if (hlimit < 0) |
| 558 | hlimit = dst_metric(dst, RTAX_HOPLIMIT); |
| 559 | if (hlimit < 0) |
| 560 | hlimit = ipv6_get_hoplimit(dst->dev); |
| 561 | |
YOSHIFUJI Hideaki | e012d51 | 2006-09-13 20:01:28 -0700 | [diff] [blame] | 562 | tclass = np->tclass; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 563 | if (tclass < 0) |
| 564 | tclass = 0; |
| 565 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | idev = in6_dev_get(skb->dev); |
| 567 | |
| 568 | msg.skb = skb; |
| 569 | msg.offset = 0; |
Yasuyuki Kozakai | 763ecff | 2006-02-15 15:24:15 -0800 | [diff] [blame] | 570 | msg.type = ICMPV6_ECHO_REPLY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | |
| 572 | 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] | 573 | sizeof(struct icmp6hdr), hlimit, tclass, NULL, &fl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | (struct rt6_info*)dst, MSG_DONTWAIT); |
| 575 | |
| 576 | if (err) { |
| 577 | ip6_flush_pending_frames(sk); |
| 578 | goto out_put; |
| 579 | } |
| 580 | err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, skb->len + sizeof(struct icmp6hdr)); |
| 581 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 582 | out_put: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | if (likely(idev != NULL)) |
| 584 | in6_dev_put(idev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | dst_release(dst); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 586 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | icmpv6_xmit_unlock(); |
| 588 | } |
| 589 | |
Al Viro | 04ce690 | 2006-11-08 00:21:01 -0800 | [diff] [blame] | 590 | 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] | 591 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | struct inet6_protocol *ipprot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | int inner_offset; |
| 594 | int hash; |
| 595 | u8 nexthdr; |
| 596 | |
| 597 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
| 598 | return; |
| 599 | |
| 600 | nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; |
| 601 | if (ipv6_ext_hdr(nexthdr)) { |
| 602 | /* now skip over extension headers */ |
Herbert Xu | 0d3d077 | 2005-04-24 20:16:19 -0700 | [diff] [blame] | 603 | inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | if (inner_offset<0) |
| 605 | return; |
| 606 | } else { |
| 607 | inner_offset = sizeof(struct ipv6hdr); |
| 608 | } |
| 609 | |
| 610 | /* Checkin header including 8 bytes of inner protocol header. */ |
| 611 | if (!pskb_may_pull(skb, inner_offset+8)) |
| 612 | return; |
| 613 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. |
| 615 | Without this we will not able f.e. to make source routed |
| 616 | pmtu discovery. |
| 617 | Corresponding argument (opt) to notifiers is already added. |
| 618 | --ANK (980726) |
| 619 | */ |
| 620 | |
| 621 | hash = nexthdr & (MAX_INET_PROTOS - 1); |
| 622 | |
| 623 | rcu_read_lock(); |
| 624 | ipprot = rcu_dereference(inet6_protos[hash]); |
| 625 | if (ipprot && ipprot->err_handler) |
| 626 | ipprot->err_handler(skb, NULL, type, code, inner_offset, info); |
| 627 | rcu_read_unlock(); |
| 628 | |
Pavel Emelyanov | 69d6da0 | 2007-11-19 22:35:57 -0800 | [diff] [blame] | 629 | raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 631 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | /* |
| 633 | * Handle icmp messages |
| 634 | */ |
| 635 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 636 | static int icmpv6_rcv(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | struct net_device *dev = skb->dev; |
| 639 | struct inet6_dev *idev = __in6_dev_get(dev); |
| 640 | struct in6_addr *saddr, *daddr; |
| 641 | struct ipv6hdr *orig_hdr; |
| 642 | struct icmp6hdr *hdr; |
| 643 | int type; |
| 644 | |
Herbert Xu | aebcf82 | 2007-12-12 18:54:16 -0800 | [diff] [blame] | 645 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 646 | int nh; |
| 647 | |
Herbert Xu | aebcf82 | 2007-12-12 18:54:16 -0800 | [diff] [blame] | 648 | if (!(skb->sp && skb->sp->xvec[skb->sp->len - 1]->props.flags & |
| 649 | XFRM_STATE_ICMP)) |
| 650 | goto drop_no_count; |
| 651 | |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 652 | if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(*orig_hdr))) |
| 653 | goto drop_no_count; |
| 654 | |
| 655 | nh = skb_network_offset(skb); |
| 656 | skb_set_network_header(skb, sizeof(*hdr)); |
| 657 | |
| 658 | if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) |
| 659 | goto drop_no_count; |
| 660 | |
| 661 | skb_set_network_header(skb, nh); |
| 662 | } |
| 663 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INMSGS); |
| 665 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 666 | saddr = &ipv6_hdr(skb)->saddr; |
| 667 | daddr = &ipv6_hdr(skb)->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | |
| 669 | /* Perform checksum. */ |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 670 | switch (skb->ip_summed) { |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 671 | case CHECKSUM_COMPLETE: |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 672 | if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, |
| 673 | skb->csum)) |
| 674 | break; |
| 675 | /* fall through */ |
| 676 | case CHECKSUM_NONE: |
Al Viro | 868c86b | 2006-11-14 21:35:48 -0800 | [diff] [blame] | 677 | skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len, |
| 678 | IPPROTO_ICMPV6, 0)); |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 679 | if (__skb_checksum_complete(skb)) { |
Joe Perches | 46b86a2 | 2006-01-13 14:29:07 -0800 | [diff] [blame] | 680 | LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [" NIP6_FMT " > " NIP6_FMT "]\n", |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 681 | NIP6(*saddr), NIP6(*daddr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | goto discard_it; |
| 683 | } |
| 684 | } |
| 685 | |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 686 | __skb_pull(skb, sizeof(*hdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | |
Arnaldo Carvalho de Melo | cc70ab2 | 2007-03-13 14:03:22 -0300 | [diff] [blame] | 688 | hdr = icmp6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | |
| 690 | type = hdr->icmp6_type; |
| 691 | |
David L Stevens | 14878f7 | 2007-09-16 16:52:35 -0700 | [diff] [blame] | 692 | ICMP6MSGIN_INC_STATS_BH(idev, type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | |
| 694 | switch (type) { |
| 695 | case ICMPV6_ECHO_REQUEST: |
| 696 | icmpv6_echo_reply(skb); |
| 697 | break; |
| 698 | |
| 699 | case ICMPV6_ECHO_REPLY: |
| 700 | /* we couldn't care less */ |
| 701 | break; |
| 702 | |
| 703 | case ICMPV6_PKT_TOOBIG: |
| 704 | /* BUGGG_FUTURE: if packet contains rthdr, we cannot update |
| 705 | standard destination cache. Seems, only "advanced" |
| 706 | destination cache will allow to solve this problem |
| 707 | --ANK (980726) |
| 708 | */ |
| 709 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
| 710 | goto discard_it; |
Arnaldo Carvalho de Melo | cc70ab2 | 2007-03-13 14:03:22 -0300 | [diff] [blame] | 711 | hdr = icmp6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | orig_hdr = (struct ipv6hdr *) (hdr + 1); |
| 713 | rt6_pmtu_discovery(&orig_hdr->daddr, &orig_hdr->saddr, dev, |
| 714 | ntohl(hdr->icmp6_mtu)); |
| 715 | |
| 716 | /* |
| 717 | * Drop through to notify |
| 718 | */ |
| 719 | |
| 720 | case ICMPV6_DEST_UNREACH: |
| 721 | case ICMPV6_TIME_EXCEED: |
| 722 | case ICMPV6_PARAMPROB: |
| 723 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); |
| 724 | break; |
| 725 | |
| 726 | case NDISC_ROUTER_SOLICITATION: |
| 727 | case NDISC_ROUTER_ADVERTISEMENT: |
| 728 | case NDISC_NEIGHBOUR_SOLICITATION: |
| 729 | case NDISC_NEIGHBOUR_ADVERTISEMENT: |
| 730 | case NDISC_REDIRECT: |
| 731 | ndisc_rcv(skb); |
| 732 | break; |
| 733 | |
| 734 | case ICMPV6_MGM_QUERY: |
| 735 | igmp6_event_query(skb); |
| 736 | break; |
| 737 | |
| 738 | case ICMPV6_MGM_REPORT: |
| 739 | igmp6_event_report(skb); |
| 740 | break; |
| 741 | |
| 742 | case ICMPV6_MGM_REDUCTION: |
| 743 | case ICMPV6_NI_QUERY: |
| 744 | case ICMPV6_NI_REPLY: |
| 745 | case ICMPV6_MLD2_REPORT: |
| 746 | case ICMPV6_DHAAD_REQUEST: |
| 747 | case ICMPV6_DHAAD_REPLY: |
| 748 | case ICMPV6_MOBILE_PREFIX_SOL: |
| 749 | case ICMPV6_MOBILE_PREFIX_ADV: |
| 750 | break; |
| 751 | |
| 752 | default: |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 753 | LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | |
| 755 | /* informational */ |
| 756 | if (type & ICMPV6_INFOMSG_MASK) |
| 757 | break; |
| 758 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 759 | /* |
| 760 | * error of unknown type. |
| 761 | * must pass to upper level |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | */ |
| 763 | |
| 764 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 765 | } |
| 766 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | kfree_skb(skb); |
| 768 | return 0; |
| 769 | |
| 770 | discard_it: |
| 771 | ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS); |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 772 | drop_no_count: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | kfree_skb(skb); |
| 774 | return 0; |
| 775 | } |
| 776 | |
Ingo Molnar | 640c41c | 2006-08-15 00:06:56 -0700 | [diff] [blame] | 777 | /* |
| 778 | * Special lock-class for __icmpv6_socket: |
| 779 | */ |
| 780 | static struct lock_class_key icmpv6_socket_sk_dst_lock_key; |
| 781 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | int __init icmpv6_init(struct net_proto_family *ops) |
| 783 | { |
| 784 | struct sock *sk; |
| 785 | int err, i, j; |
| 786 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 787 | for_each_possible_cpu(i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, |
| 789 | &per_cpu(__icmpv6_socket, i)); |
| 790 | if (err < 0) { |
| 791 | printk(KERN_ERR |
| 792 | "Failed to initialize the ICMP6 control socket " |
| 793 | "(err %d).\n", |
| 794 | err); |
| 795 | goto fail; |
| 796 | } |
| 797 | |
| 798 | sk = per_cpu(__icmpv6_socket, i)->sk; |
| 799 | sk->sk_allocation = GFP_ATOMIC; |
Ingo Molnar | 640c41c | 2006-08-15 00:06:56 -0700 | [diff] [blame] | 800 | /* |
| 801 | * Split off their lock-class, because sk->sk_dst_lock |
| 802 | * gets used from softirqs, which is safe for |
| 803 | * __icmpv6_socket (because those never get directly used |
| 804 | * via userspace syscalls), but unsafe for normal sockets. |
| 805 | */ |
| 806 | lockdep_set_class(&sk->sk_dst_lock, |
| 807 | &icmpv6_socket_sk_dst_lock_key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | |
| 809 | /* Enough space for 2 64K ICMP packets, including |
| 810 | * sk_buff struct overhead. |
| 811 | */ |
| 812 | sk->sk_sndbuf = |
| 813 | (2 * ((64 * 1024) + sizeof(struct sk_buff))); |
| 814 | |
| 815 | sk->sk_prot->unhash(sk); |
| 816 | } |
| 817 | |
| 818 | |
| 819 | if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) { |
| 820 | printk(KERN_ERR "Failed to register ICMP6 protocol\n"); |
| 821 | err = -EAGAIN; |
| 822 | goto fail; |
| 823 | } |
| 824 | |
| 825 | return 0; |
| 826 | |
| 827 | fail: |
| 828 | for (j = 0; j < i; j++) { |
| 829 | if (!cpu_possible(j)) |
| 830 | continue; |
| 831 | sock_release(per_cpu(__icmpv6_socket, j)); |
| 832 | } |
| 833 | |
| 834 | return err; |
| 835 | } |
| 836 | |
| 837 | void icmpv6_cleanup(void) |
| 838 | { |
| 839 | int i; |
| 840 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 841 | for_each_possible_cpu(i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | sock_release(per_cpu(__icmpv6_socket, i)); |
| 843 | } |
| 844 | inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); |
| 845 | } |
| 846 | |
Arjan van de Ven | 9b5b5cf | 2005-11-29 16:21:38 -0800 | [diff] [blame] | 847 | static const struct icmp6_err { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | int err; |
| 849 | int fatal; |
| 850 | } tab_unreach[] = { |
| 851 | { /* NOROUTE */ |
| 852 | .err = ENETUNREACH, |
| 853 | .fatal = 0, |
| 854 | }, |
| 855 | { /* ADM_PROHIBITED */ |
| 856 | .err = EACCES, |
| 857 | .fatal = 1, |
| 858 | }, |
| 859 | { /* Was NOT_NEIGHBOUR, now reserved */ |
| 860 | .err = EHOSTUNREACH, |
| 861 | .fatal = 0, |
| 862 | }, |
| 863 | { /* ADDR_UNREACH */ |
| 864 | .err = EHOSTUNREACH, |
| 865 | .fatal = 0, |
| 866 | }, |
| 867 | { /* PORT_UNREACH */ |
| 868 | .err = ECONNREFUSED, |
| 869 | .fatal = 1, |
| 870 | }, |
| 871 | }; |
| 872 | |
| 873 | int icmpv6_err_convert(int type, int code, int *err) |
| 874 | { |
| 875 | int fatal = 0; |
| 876 | |
| 877 | *err = EPROTO; |
| 878 | |
| 879 | switch (type) { |
| 880 | case ICMPV6_DEST_UNREACH: |
| 881 | fatal = 1; |
| 882 | if (code <= ICMPV6_PORT_UNREACH) { |
| 883 | *err = tab_unreach[code].err; |
| 884 | fatal = tab_unreach[code].fatal; |
| 885 | } |
| 886 | break; |
| 887 | |
| 888 | case ICMPV6_PKT_TOOBIG: |
| 889 | *err = EMSGSIZE; |
| 890 | break; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 891 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | case ICMPV6_PARAMPROB: |
| 893 | *err = EPROTO; |
| 894 | fatal = 1; |
| 895 | break; |
| 896 | |
| 897 | case ICMPV6_TIME_EXCEED: |
| 898 | *err = EHOSTUNREACH; |
| 899 | break; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 900 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | |
| 902 | return fatal; |
| 903 | } |
| 904 | |
YOSHIFUJI Hideaki | 7159039 | 2007-02-22 22:05:40 +0900 | [diff] [blame] | 905 | EXPORT_SYMBOL(icmpv6_err_convert); |
| 906 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | #ifdef CONFIG_SYSCTL |
Daniel Lezcano | 760f2d0 | 2008-01-10 02:53:43 -0800 | [diff] [blame] | 908 | ctl_table ipv6_icmp_table_template[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | { |
| 910 | .ctl_name = NET_IPV6_ICMP_RATELIMIT, |
| 911 | .procname = "ratelimit", |
Daniel Lezcano | 41a7690 | 2008-01-10 03:02:40 -0800 | [diff] [blame] | 912 | .data = &init_net.ipv6.sysctl.icmpv6_time, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | .maxlen = sizeof(int), |
| 914 | .mode = 0644, |
| 915 | .proc_handler = &proc_dointvec |
| 916 | }, |
| 917 | { .ctl_name = 0 }, |
| 918 | }; |
Daniel Lezcano | 760f2d0 | 2008-01-10 02:53:43 -0800 | [diff] [blame] | 919 | |
| 920 | struct ctl_table *ipv6_icmp_sysctl_init(struct net *net) |
| 921 | { |
| 922 | struct ctl_table *table; |
| 923 | |
| 924 | table = kmemdup(ipv6_icmp_table_template, |
| 925 | sizeof(ipv6_icmp_table_template), |
| 926 | GFP_KERNEL); |
| 927 | return table; |
| 928 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | #endif |
| 930 | |