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 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * Based on net/ipv4/icmp.c |
| 9 | * |
| 10 | * RFC 1885 |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License |
| 14 | * as published by the Free Software Foundation; either version |
| 15 | * 2 of the License, or (at your option) any later version. |
| 16 | */ |
| 17 | |
| 18 | /* |
| 19 | * Changes: |
| 20 | * |
| 21 | * Andi Kleen : exception handling |
| 22 | * Andi Kleen add rate limits. never reply to a icmp. |
| 23 | * add more length checks and other fixes. |
| 24 | * yoshfuji : ensure to sent parameter problem for |
| 25 | * fragments. |
| 26 | * YOSHIFUJI Hideaki @USAGI: added sysctl for icmp rate limit. |
| 27 | * Randy Dunlap and |
| 28 | * YOSHIFUJI Hideaki @USAGI: Per-interface statistics support |
| 29 | * Kazunori MIYAZAWA @USAGI: change output process to use ip6_append_data |
| 30 | */ |
| 31 | |
| 32 | #include <linux/module.h> |
| 33 | #include <linux/errno.h> |
| 34 | #include <linux/types.h> |
| 35 | #include <linux/socket.h> |
| 36 | #include <linux/in.h> |
| 37 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include <linux/sockios.h> |
| 39 | #include <linux/net.h> |
| 40 | #include <linux/skbuff.h> |
| 41 | #include <linux/init.h> |
Yasuyuki Kozakai | 763ecff | 2006-02-15 15:24:15 -0800 | [diff] [blame] | 42 | #include <linux/netfilter.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
| 44 | #ifdef CONFIG_SYSCTL |
| 45 | #include <linux/sysctl.h> |
| 46 | #endif |
| 47 | |
| 48 | #include <linux/inet.h> |
| 49 | #include <linux/netdevice.h> |
| 50 | #include <linux/icmpv6.h> |
| 51 | |
| 52 | #include <net/ip.h> |
| 53 | #include <net/sock.h> |
| 54 | |
| 55 | #include <net/ipv6.h> |
| 56 | #include <net/ip6_checksum.h> |
| 57 | #include <net/protocol.h> |
| 58 | #include <net/raw.h> |
| 59 | #include <net/rawv6.h> |
| 60 | #include <net/transp_v6.h> |
| 61 | #include <net/ip6_route.h> |
| 62 | #include <net/addrconf.h> |
| 63 | #include <net/icmp.h> |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 64 | #include <net/xfrm.h> |
Denis V. Lunev | 1ed8516 | 2008-04-03 14:31:03 -0700 | [diff] [blame] | 65 | #include <net/inet_common.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
YOSHIFUJI Hideaki | 7159039 | 2007-02-22 22:05:40 +0900 | [diff] [blame] | 71 | EXPORT_SYMBOL(icmpv6_statistics); |
David L Stevens | 14878f7 | 2007-09-16 16:52:35 -0700 | [diff] [blame] | 72 | DEFINE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics) __read_mostly; |
| 73 | EXPORT_SYMBOL(icmpv6msg_statistics); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | |
| 75 | /* |
| 76 | * The ICMP socket(s). This is the most convenient way to flow control |
| 77 | * our ICMP output as well as maintain a clean interface throughout |
| 78 | * all layers. All Socketless IP sends will soon be gone. |
| 79 | * |
| 80 | * On SMP we have one ICMP socket per-cpu. |
| 81 | */ |
Denis V. Lunev | 98c6d1b | 2008-02-29 11:21:22 -0800 | [diff] [blame] | 82 | static inline struct sock *icmpv6_sk(struct net *net) |
| 83 | { |
| 84 | return net->ipv6.icmp_sk[smp_processor_id()]; |
| 85 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 87 | static int icmpv6_rcv(struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
| 89 | static struct inet6_protocol icmpv6_protocol = { |
| 90 | .handler = icmpv6_rcv, |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 91 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | }; |
| 93 | |
Denis V. Lunev | fdc0bde | 2008-08-23 04:43:33 -0700 | [diff] [blame] | 94 | static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | { |
Denis V. Lunev | fdc0bde | 2008-08-23 04:43:33 -0700 | [diff] [blame] | 96 | struct sock *sk; |
| 97 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | local_bh_disable(); |
| 99 | |
Denis V. Lunev | fdc0bde | 2008-08-23 04:43:33 -0700 | [diff] [blame] | 100 | sk = icmpv6_sk(net); |
Denis V. Lunev | 405666d | 2008-02-29 11:16:46 -0800 | [diff] [blame] | 101 | if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | /* This can happen if the output path (f.e. SIT or |
| 103 | * ip6ip6 tunnel) signals dst_link_failure() for an |
| 104 | * outgoing ICMP6 packet. |
| 105 | */ |
| 106 | local_bh_enable(); |
Denis V. Lunev | fdc0bde | 2008-08-23 04:43:33 -0700 | [diff] [blame] | 107 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | } |
Denis V. Lunev | fdc0bde | 2008-08-23 04:43:33 -0700 | [diff] [blame] | 109 | return sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | } |
| 111 | |
Denis V. Lunev | 405666d | 2008-02-29 11:16:46 -0800 | [diff] [blame] | 112 | static __inline__ void icmpv6_xmit_unlock(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | { |
Denis V. Lunev | 405666d | 2008-02-29 11:16:46 -0800 | [diff] [blame] | 114 | spin_unlock_bh(&sk->sk_lock.slock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | } |
| 116 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 117 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | * Slightly more convenient version of icmpv6_send. |
| 119 | */ |
| 120 | void icmpv6_param_prob(struct sk_buff *skb, int code, int pos) |
| 121 | { |
| 122 | icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos, skb->dev); |
| 123 | kfree_skb(skb); |
| 124 | } |
| 125 | |
| 126 | /* |
| 127 | * Figure out, may we reply to this packet with icmp error. |
| 128 | * |
| 129 | * We do not reply, if: |
| 130 | * - it was icmp error message. |
| 131 | * - it is truncated, so that it is known, that protocol is ICMPV6 |
| 132 | * (i.e. in the middle of some exthdr) |
| 133 | * |
| 134 | * --ANK (980726) |
| 135 | */ |
| 136 | |
| 137 | static int is_ineligible(struct sk_buff *skb) |
| 138 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 139 | int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | int len = skb->len - ptr; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 141 | __u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | |
| 143 | if (len < 0) |
| 144 | return 1; |
| 145 | |
Herbert Xu | 0d3d077 | 2005-04-24 20:16:19 -0700 | [diff] [blame] | 146 | ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | if (ptr < 0) |
| 148 | return 0; |
| 149 | if (nexthdr == IPPROTO_ICMPV6) { |
| 150 | u8 _type, *tp; |
| 151 | tp = skb_header_pointer(skb, |
| 152 | ptr+offsetof(struct icmp6hdr, icmp6_type), |
| 153 | sizeof(_type), &_type); |
| 154 | if (tp == NULL || |
| 155 | !(*tp & ICMPV6_INFOMSG_MASK)) |
| 156 | return 1; |
| 157 | } |
| 158 | return 0; |
| 159 | } |
| 160 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 161 | /* |
| 162 | * Check the ICMP output rate limit |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | */ |
| 164 | static inline int icmpv6_xrlim_allow(struct sock *sk, int type, |
| 165 | struct flowi *fl) |
| 166 | { |
| 167 | struct dst_entry *dst; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 168 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | int res = 0; |
| 170 | |
| 171 | /* Informational messages are not limited. */ |
| 172 | if (type & ICMPV6_INFOMSG_MASK) |
| 173 | return 1; |
| 174 | |
| 175 | /* Do not limit pmtu discovery, it would break it. */ |
| 176 | if (type == ICMPV6_PKT_TOOBIG) |
| 177 | return 1; |
| 178 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 179 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | * Look up the output route. |
| 181 | * XXX: perhaps the expire for routing entries cloned by |
| 182 | * this lookup should be more aggressive (not longer than timeout). |
| 183 | */ |
Benjamin Thery | 9a43b70 | 2008-03-05 10:49:18 -0800 | [diff] [blame] | 184 | dst = ip6_route_output(net, sk, fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | if (dst->error) { |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 186 | IP6_INC_STATS(net, ip6_dst_idev(dst), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 187 | IPSTATS_MIB_OUTNOROUTES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { |
| 189 | res = 1; |
| 190 | } else { |
| 191 | struct rt6_info *rt = (struct rt6_info *)dst; |
Benjamin Thery | 9a43b70 | 2008-03-05 10:49:18 -0800 | [diff] [blame] | 192 | int tmo = net->ipv6.sysctl.icmpv6_time; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | |
| 194 | /* Give more bandwidth to wider prefixes. */ |
| 195 | if (rt->rt6i_dst.plen < 128) |
| 196 | tmo >>= ((128 - rt->rt6i_dst.plen)>>5); |
| 197 | |
| 198 | res = xrlim_allow(dst, tmo); |
| 199 | } |
| 200 | dst_release(dst); |
| 201 | return res; |
| 202 | } |
| 203 | |
| 204 | /* |
| 205 | * an inline helper for the "simple" if statement below |
| 206 | * checks if parameter problem report is caused by an |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 207 | * unrecognized IPv6 option that has the Option Type |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | * highest-order two bits set to 10 |
| 209 | */ |
| 210 | |
| 211 | static __inline__ int opt_unrec(struct sk_buff *skb, __u32 offset) |
| 212 | { |
| 213 | u8 _optval, *op; |
| 214 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 215 | offset += skb_network_offset(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); |
| 217 | if (op == NULL) |
| 218 | return 1; |
| 219 | return (*op & 0xC0) == 0x80; |
| 220 | } |
| 221 | |
| 222 | static int icmpv6_push_pending_frames(struct sock *sk, struct flowi *fl, struct icmp6hdr *thdr, int len) |
| 223 | { |
| 224 | struct sk_buff *skb; |
| 225 | struct icmp6hdr *icmp6h; |
| 226 | int err = 0; |
| 227 | |
| 228 | if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) |
| 229 | goto out; |
| 230 | |
Arnaldo Carvalho de Melo | cc70ab2 | 2007-03-13 14:03:22 -0300 | [diff] [blame] | 231 | icmp6h = icmp6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); |
| 233 | icmp6h->icmp6_cksum = 0; |
| 234 | |
| 235 | if (skb_queue_len(&sk->sk_write_queue) == 1) { |
| 236 | skb->csum = csum_partial((char *)icmp6h, |
| 237 | sizeof(struct icmp6hdr), skb->csum); |
| 238 | icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src, |
| 239 | &fl->fl6_dst, |
| 240 | len, fl->proto, |
| 241 | skb->csum); |
| 242 | } else { |
Al Viro | 868c86b | 2006-11-14 21:35:48 -0800 | [diff] [blame] | 243 | __wsum tmp_csum = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
| 245 | skb_queue_walk(&sk->sk_write_queue, skb) { |
| 246 | tmp_csum = csum_add(tmp_csum, skb->csum); |
| 247 | } |
| 248 | |
| 249 | tmp_csum = csum_partial((char *)icmp6h, |
| 250 | sizeof(struct icmp6hdr), tmp_csum); |
Al Viro | 868c86b | 2006-11-14 21:35:48 -0800 | [diff] [blame] | 251 | icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src, |
| 252 | &fl->fl6_dst, |
| 253 | len, fl->proto, |
| 254 | tmp_csum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | ip6_push_pending_frames(sk); |
| 257 | out: |
| 258 | return err; |
| 259 | } |
| 260 | |
| 261 | struct icmpv6_msg { |
| 262 | struct sk_buff *skb; |
| 263 | int offset; |
Yasuyuki Kozakai | 763ecff | 2006-02-15 15:24:15 -0800 | [diff] [blame] | 264 | uint8_t type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | }; |
| 266 | |
| 267 | static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) |
| 268 | { |
| 269 | struct icmpv6_msg *msg = (struct icmpv6_msg *) from; |
| 270 | struct sk_buff *org_skb = msg->skb; |
Al Viro | 5f92a73 | 2006-11-14 21:36:54 -0800 | [diff] [blame] | 271 | __wsum csum = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
| 273 | csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, |
| 274 | to, len, csum); |
| 275 | skb->csum = csum_block_add(skb->csum, csum, odd); |
Yasuyuki Kozakai | 763ecff | 2006-02-15 15:24:15 -0800 | [diff] [blame] | 276 | if (!(msg->type & ICMPV6_INFOMSG_MASK)) |
| 277 | nf_ct_attach(skb, org_skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | return 0; |
| 279 | } |
| 280 | |
Masahide NAKAMURA | 59fbb3a6 | 2007-06-26 23:56:32 -0700 | [diff] [blame] | 281 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
Masahide NAKAMURA | 7938323 | 2006-08-23 19:27:25 -0700 | [diff] [blame] | 282 | static void mip6_addr_swap(struct sk_buff *skb) |
| 283 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 284 | struct ipv6hdr *iph = ipv6_hdr(skb); |
Masahide NAKAMURA | 7938323 | 2006-08-23 19:27:25 -0700 | [diff] [blame] | 285 | struct inet6_skb_parm *opt = IP6CB(skb); |
| 286 | struct ipv6_destopt_hao *hao; |
| 287 | struct in6_addr tmp; |
| 288 | int off; |
| 289 | |
| 290 | if (opt->dsthao) { |
| 291 | off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); |
| 292 | if (likely(off >= 0)) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 293 | hao = (struct ipv6_destopt_hao *) |
| 294 | (skb_network_header(skb) + off); |
Masahide NAKAMURA | 7938323 | 2006-08-23 19:27:25 -0700 | [diff] [blame] | 295 | ipv6_addr_copy(&tmp, &iph->saddr); |
| 296 | ipv6_addr_copy(&iph->saddr, &hao->addr); |
| 297 | ipv6_addr_copy(&hao->addr, &tmp); |
| 298 | } |
| 299 | } |
| 300 | } |
| 301 | #else |
| 302 | static inline void mip6_addr_swap(struct sk_buff *skb) {} |
| 303 | #endif |
| 304 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | /* |
| 306 | * Send an ICMP message in response to a packet in error |
| 307 | */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 308 | 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] | 309 | struct net_device *dev) |
| 310 | { |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 311 | struct net *net = dev_net(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | struct inet6_dev *idev = NULL; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 313 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
YOSHIFUJI Hideaki | 84427d5 | 2005-06-13 14:59:44 -0700 | [diff] [blame] | 314 | struct sock *sk; |
| 315 | struct ipv6_pinfo *np; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | struct in6_addr *saddr = NULL; |
| 317 | struct dst_entry *dst; |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 318 | struct dst_entry *dst2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | struct icmp6hdr tmp_hdr; |
| 320 | struct flowi fl; |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 321 | struct flowi fl2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | struct icmpv6_msg msg; |
| 323 | int iif = 0; |
| 324 | int addr_type = 0; |
| 325 | int len; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 326 | int hlimit, tclass; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | int err = 0; |
| 328 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 329 | if ((u8 *)hdr < skb->head || |
| 330 | (skb->network_header + sizeof(*hdr)) > skb->tail) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | return; |
| 332 | |
| 333 | /* |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 334 | * Make sure we respect the rules |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | * i.e. RFC 1885 2.4(e) |
| 336 | * Rule (e.1) is enforced by not using icmpv6_send |
| 337 | * in any code that processes icmp errors. |
| 338 | */ |
| 339 | addr_type = ipv6_addr_type(&hdr->daddr); |
| 340 | |
Benjamin Thery | 9a43b70 | 2008-03-05 10:49:18 -0800 | [diff] [blame] | 341 | if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | saddr = &hdr->daddr; |
| 343 | |
| 344 | /* |
| 345 | * Dest addr check |
| 346 | */ |
| 347 | |
| 348 | if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) { |
| 349 | if (type != ICMPV6_PKT_TOOBIG && |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 350 | !(type == ICMPV6_PARAMPROB && |
| 351 | code == ICMPV6_UNK_OPTION && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | (opt_unrec(skb, info)))) |
| 353 | return; |
| 354 | |
| 355 | saddr = NULL; |
| 356 | } |
| 357 | |
| 358 | addr_type = ipv6_addr_type(&hdr->saddr); |
| 359 | |
| 360 | /* |
| 361 | * Source addr check |
| 362 | */ |
| 363 | |
| 364 | if (addr_type & IPV6_ADDR_LINKLOCAL) |
| 365 | iif = skb->dev->ifindex; |
| 366 | |
| 367 | /* |
YOSHIFUJI Hideaki | 8de3351 | 2005-12-21 22:57:06 +0900 | [diff] [blame] | 368 | * Must not send error if the source does not uniquely |
| 369 | * identify a single node (RFC2463 Section 2.4). |
| 370 | * We check unspecified / multicast addresses here, |
| 371 | * and anycast addresses will be checked later. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | */ |
| 373 | if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 374 | LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | return; |
| 376 | } |
| 377 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 378 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | * Never answer to a ICMP packet. |
| 380 | */ |
| 381 | if (is_ineligible(skb)) { |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 382 | LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | return; |
| 384 | } |
| 385 | |
Masahide NAKAMURA | 7938323 | 2006-08-23 19:27:25 -0700 | [diff] [blame] | 386 | mip6_addr_swap(skb); |
| 387 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | memset(&fl, 0, sizeof(fl)); |
| 389 | fl.proto = IPPROTO_ICMPV6; |
| 390 | ipv6_addr_copy(&fl.fl6_dst, &hdr->saddr); |
| 391 | if (saddr) |
| 392 | ipv6_addr_copy(&fl.fl6_src, saddr); |
| 393 | fl.oif = iif; |
| 394 | fl.fl_icmp_type = type; |
| 395 | fl.fl_icmp_code = code; |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 396 | security_skb_classify_flow(skb, &fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | |
Denis V. Lunev | fdc0bde | 2008-08-23 04:43:33 -0700 | [diff] [blame] | 398 | sk = icmpv6_xmit_lock(net); |
| 399 | if (sk == NULL) |
Denis V. Lunev | 405666d | 2008-02-29 11:16:46 -0800 | [diff] [blame] | 400 | return; |
Denis V. Lunev | fdc0bde | 2008-08-23 04:43:33 -0700 | [diff] [blame] | 401 | np = inet6_sk(sk); |
Denis V. Lunev | 405666d | 2008-02-29 11:16:46 -0800 | [diff] [blame] | 402 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | if (!icmpv6_xrlim_allow(sk, type, &fl)) |
| 404 | goto out; |
| 405 | |
| 406 | tmp_hdr.icmp6_type = type; |
| 407 | tmp_hdr.icmp6_code = code; |
| 408 | tmp_hdr.icmp6_cksum = 0; |
| 409 | tmp_hdr.icmp6_pointer = htonl(info); |
| 410 | |
| 411 | if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) |
| 412 | fl.oif = np->mcast_oif; |
| 413 | |
| 414 | err = ip6_dst_lookup(sk, &dst, &fl); |
| 415 | if (err) |
| 416 | goto out; |
YOSHIFUJI Hideaki | 8de3351 | 2005-12-21 22:57:06 +0900 | [diff] [blame] | 417 | |
| 418 | /* |
| 419 | * We won't send icmp if the destination is known |
| 420 | * anycast. |
| 421 | */ |
| 422 | if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { |
| 423 | LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n"); |
| 424 | goto out_dst_release; |
| 425 | } |
| 426 | |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 427 | /* No need to clone since we're just using its address. */ |
| 428 | dst2 = dst; |
| 429 | |
| 430 | err = xfrm_lookup(&dst, &fl, sk, 0); |
| 431 | switch (err) { |
| 432 | case 0: |
| 433 | if (dst != dst2) |
| 434 | goto route_done; |
| 435 | break; |
| 436 | case -EPERM: |
| 437 | dst = NULL; |
| 438 | break; |
| 439 | default: |
| 440 | goto out; |
| 441 | } |
| 442 | |
| 443 | if (xfrm_decode_session_reverse(skb, &fl2, AF_INET6)) |
Herbert Xu | af26818 | 2008-04-03 12:52:19 -0700 | [diff] [blame] | 444 | goto relookup_failed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 446 | if (ip6_dst_lookup(sk, &dst2, &fl)) |
Herbert Xu | af26818 | 2008-04-03 12:52:19 -0700 | [diff] [blame] | 447 | goto relookup_failed; |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 448 | |
| 449 | err = xfrm_lookup(&dst2, &fl, sk, XFRM_LOOKUP_ICMP); |
Herbert Xu | af26818 | 2008-04-03 12:52:19 -0700 | [diff] [blame] | 450 | switch (err) { |
| 451 | case 0: |
| 452 | dst_release(dst); |
| 453 | dst = dst2; |
| 454 | break; |
| 455 | case -EPERM: |
| 456 | goto out_dst_release; |
| 457 | default: |
| 458 | relookup_failed: |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 459 | if (!dst) |
| 460 | goto out; |
Herbert Xu | af26818 | 2008-04-03 12:52:19 -0700 | [diff] [blame] | 461 | break; |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 462 | } |
| 463 | |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 464 | route_done: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | if (ipv6_addr_is_multicast(&fl.fl6_dst)) |
| 466 | hlimit = np->mcast_hops; |
| 467 | else |
| 468 | hlimit = np->hop_limit; |
| 469 | if (hlimit < 0) |
YOSHIFUJI Hideaki | 6b75d09 | 2008-03-10 06:00:30 -0400 | [diff] [blame] | 470 | hlimit = ip6_dst_hoplimit(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | |
YOSHIFUJI Hideaki | e012d51 | 2006-09-13 20:01:28 -0700 | [diff] [blame] | 472 | tclass = np->tclass; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 473 | if (tclass < 0) |
| 474 | tclass = 0; |
| 475 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | msg.skb = skb; |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 477 | msg.offset = skb_network_offset(skb); |
Yasuyuki Kozakai | 763ecff | 2006-02-15 15:24:15 -0800 | [diff] [blame] | 478 | msg.type = type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | |
| 480 | len = skb->len - msg.offset; |
| 481 | len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); |
| 482 | if (len < 0) { |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 483 | LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | goto out_dst_release; |
| 485 | } |
| 486 | |
| 487 | idev = in6_dev_get(skb->dev); |
| 488 | |
| 489 | err = ip6_append_data(sk, icmpv6_getfrag, &msg, |
| 490 | len + sizeof(struct icmp6hdr), |
| 491 | sizeof(struct icmp6hdr), |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 492 | hlimit, tclass, NULL, &fl, (struct rt6_info*)dst, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | MSG_DONTWAIT); |
| 494 | if (err) { |
| 495 | ip6_flush_pending_frames(sk); |
| 496 | goto out_put; |
| 497 | } |
| 498 | err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, len + sizeof(struct icmp6hdr)); |
| 499 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | out_put: |
| 501 | if (likely(idev != NULL)) |
| 502 | in6_dev_put(idev); |
| 503 | out_dst_release: |
| 504 | dst_release(dst); |
| 505 | out: |
Denis V. Lunev | 405666d | 2008-02-29 11:16:46 -0800 | [diff] [blame] | 506 | icmpv6_xmit_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | } |
| 508 | |
YOSHIFUJI Hideaki | 7159039 | 2007-02-22 22:05:40 +0900 | [diff] [blame] | 509 | EXPORT_SYMBOL(icmpv6_send); |
| 510 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | static void icmpv6_echo_reply(struct sk_buff *skb) |
| 512 | { |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 513 | struct net *net = dev_net(skb->dev); |
YOSHIFUJI Hideaki | 84427d5 | 2005-06-13 14:59:44 -0700 | [diff] [blame] | 514 | struct sock *sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | struct inet6_dev *idev; |
YOSHIFUJI Hideaki | 84427d5 | 2005-06-13 14:59:44 -0700 | [diff] [blame] | 516 | struct ipv6_pinfo *np; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | struct in6_addr *saddr = NULL; |
Arnaldo Carvalho de Melo | cc70ab2 | 2007-03-13 14:03:22 -0300 | [diff] [blame] | 518 | struct icmp6hdr *icmph = icmp6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | struct icmp6hdr tmp_hdr; |
| 520 | struct flowi fl; |
| 521 | struct icmpv6_msg msg; |
| 522 | struct dst_entry *dst; |
| 523 | int err = 0; |
| 524 | int hlimit; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 525 | int tclass; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 527 | saddr = &ipv6_hdr(skb)->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | |
| 529 | if (!ipv6_unicast_destination(skb)) |
| 530 | saddr = NULL; |
| 531 | |
| 532 | memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); |
| 533 | tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; |
| 534 | |
| 535 | memset(&fl, 0, sizeof(fl)); |
| 536 | fl.proto = IPPROTO_ICMPV6; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 537 | ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | if (saddr) |
| 539 | ipv6_addr_copy(&fl.fl6_src, saddr); |
| 540 | fl.oif = skb->dev->ifindex; |
| 541 | fl.fl_icmp_type = ICMPV6_ECHO_REPLY; |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 542 | security_skb_classify_flow(skb, &fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | |
Denis V. Lunev | fdc0bde | 2008-08-23 04:43:33 -0700 | [diff] [blame] | 544 | sk = icmpv6_xmit_lock(net); |
| 545 | if (sk == NULL) |
Denis V. Lunev | 405666d | 2008-02-29 11:16:46 -0800 | [diff] [blame] | 546 | return; |
Denis V. Lunev | fdc0bde | 2008-08-23 04:43:33 -0700 | [diff] [blame] | 547 | np = inet6_sk(sk); |
Denis V. Lunev | 405666d | 2008-02-29 11:16:46 -0800 | [diff] [blame] | 548 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) |
| 550 | fl.oif = np->mcast_oif; |
| 551 | |
| 552 | err = ip6_dst_lookup(sk, &dst, &fl); |
| 553 | if (err) |
| 554 | goto out; |
| 555 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) |
Patrick McHardy | e104411b | 2005-09-08 15:11:55 -0700 | [diff] [blame] | 556 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | |
| 558 | if (ipv6_addr_is_multicast(&fl.fl6_dst)) |
| 559 | hlimit = np->mcast_hops; |
| 560 | else |
| 561 | hlimit = np->hop_limit; |
| 562 | if (hlimit < 0) |
YOSHIFUJI Hideaki | 6b75d09 | 2008-03-10 06:00:30 -0400 | [diff] [blame] | 563 | hlimit = ip6_dst_hoplimit(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | |
YOSHIFUJI Hideaki | e012d51 | 2006-09-13 20:01:28 -0700 | [diff] [blame] | 565 | tclass = np->tclass; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 566 | if (tclass < 0) |
| 567 | tclass = 0; |
| 568 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | idev = in6_dev_get(skb->dev); |
| 570 | |
| 571 | msg.skb = skb; |
| 572 | msg.offset = 0; |
Yasuyuki Kozakai | 763ecff | 2006-02-15 15:24:15 -0800 | [diff] [blame] | 573 | msg.type = ICMPV6_ECHO_REPLY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | |
| 575 | 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] | 576 | sizeof(struct icmp6hdr), hlimit, tclass, NULL, &fl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | (struct rt6_info*)dst, MSG_DONTWAIT); |
| 578 | |
| 579 | if (err) { |
| 580 | ip6_flush_pending_frames(sk); |
| 581 | goto out_put; |
| 582 | } |
| 583 | err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, skb->len + sizeof(struct icmp6hdr)); |
| 584 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 585 | out_put: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | if (likely(idev != NULL)) |
| 587 | in6_dev_put(idev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | dst_release(dst); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 589 | out: |
Denis V. Lunev | 405666d | 2008-02-29 11:16:46 -0800 | [diff] [blame] | 590 | icmpv6_xmit_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | } |
| 592 | |
Al Viro | 04ce690 | 2006-11-08 00:21:01 -0800 | [diff] [blame] | 593 | 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] | 594 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | struct inet6_protocol *ipprot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | int inner_offset; |
| 597 | int hash; |
| 598 | u8 nexthdr; |
| 599 | |
| 600 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
| 601 | return; |
| 602 | |
| 603 | nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; |
| 604 | if (ipv6_ext_hdr(nexthdr)) { |
| 605 | /* now skip over extension headers */ |
Herbert Xu | 0d3d077 | 2005-04-24 20:16:19 -0700 | [diff] [blame] | 606 | inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | if (inner_offset<0) |
| 608 | return; |
| 609 | } else { |
| 610 | inner_offset = sizeof(struct ipv6hdr); |
| 611 | } |
| 612 | |
| 613 | /* Checkin header including 8 bytes of inner protocol header. */ |
| 614 | if (!pskb_may_pull(skb, inner_offset+8)) |
| 615 | return; |
| 616 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. |
| 618 | Without this we will not able f.e. to make source routed |
| 619 | pmtu discovery. |
| 620 | Corresponding argument (opt) to notifiers is already added. |
| 621 | --ANK (980726) |
| 622 | */ |
| 623 | |
| 624 | hash = nexthdr & (MAX_INET_PROTOS - 1); |
| 625 | |
| 626 | rcu_read_lock(); |
| 627 | ipprot = rcu_dereference(inet6_protos[hash]); |
| 628 | if (ipprot && ipprot->err_handler) |
| 629 | ipprot->err_handler(skb, NULL, type, code, inner_offset, info); |
| 630 | rcu_read_unlock(); |
| 631 | |
Pavel Emelyanov | 69d6da0 | 2007-11-19 22:35:57 -0800 | [diff] [blame] | 632 | raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 634 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | /* |
| 636 | * Handle icmp messages |
| 637 | */ |
| 638 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 639 | static int icmpv6_rcv(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | struct net_device *dev = skb->dev; |
| 642 | struct inet6_dev *idev = __in6_dev_get(dev); |
| 643 | struct in6_addr *saddr, *daddr; |
| 644 | struct ipv6hdr *orig_hdr; |
| 645 | struct icmp6hdr *hdr; |
| 646 | int type; |
| 647 | |
Herbert Xu | aebcf82 | 2007-12-12 18:54:16 -0800 | [diff] [blame] | 648 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
Alexey Dobriyan | def8b4f | 2008-10-28 13:24:06 -0700 | [diff] [blame] | 649 | struct sec_path *sp = skb_sec_path(skb); |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 650 | int nh; |
| 651 | |
Alexey Dobriyan | def8b4f | 2008-10-28 13:24:06 -0700 | [diff] [blame] | 652 | if (!(sp && sp->xvec[sp->len - 1]->props.flags & |
Herbert Xu | aebcf82 | 2007-12-12 18:54:16 -0800 | [diff] [blame] | 653 | XFRM_STATE_ICMP)) |
| 654 | goto drop_no_count; |
| 655 | |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 656 | if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(*orig_hdr))) |
| 657 | goto drop_no_count; |
| 658 | |
| 659 | nh = skb_network_offset(skb); |
| 660 | skb_set_network_header(skb, sizeof(*hdr)); |
| 661 | |
| 662 | if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) |
| 663 | goto drop_no_count; |
| 664 | |
| 665 | skb_set_network_header(skb, nh); |
| 666 | } |
| 667 | |
Denis V. Lunev | e41b536 | 2008-10-08 10:33:26 -0700 | [diff] [blame] | 668 | ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INMSGS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 670 | saddr = &ipv6_hdr(skb)->saddr; |
| 671 | daddr = &ipv6_hdr(skb)->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | |
| 673 | /* Perform checksum. */ |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 674 | switch (skb->ip_summed) { |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 675 | case CHECKSUM_COMPLETE: |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 676 | if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, |
| 677 | skb->csum)) |
| 678 | break; |
| 679 | /* fall through */ |
| 680 | case CHECKSUM_NONE: |
Al Viro | 868c86b | 2006-11-14 21:35:48 -0800 | [diff] [blame] | 681 | skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len, |
| 682 | IPPROTO_ICMPV6, 0)); |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 683 | if (__skb_checksum_complete(skb)) { |
Harvey Harrison | 5b095d989 | 2008-10-29 12:52:50 -0700 | [diff] [blame^] | 684 | LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [%pI6 > %pI6]\n", |
Harvey Harrison | 0c6ce78 | 2008-10-28 16:09:23 -0700 | [diff] [blame] | 685 | saddr, daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | goto discard_it; |
| 687 | } |
| 688 | } |
| 689 | |
Herbert Xu | 8cf2294 | 2008-02-05 03:15:50 -0800 | [diff] [blame] | 690 | if (!pskb_pull(skb, sizeof(*hdr))) |
| 691 | goto discard_it; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | |
Arnaldo Carvalho de Melo | cc70ab2 | 2007-03-13 14:03:22 -0300 | [diff] [blame] | 693 | hdr = icmp6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | |
| 695 | type = hdr->icmp6_type; |
| 696 | |
Denis V. Lunev | 55d4380 | 2008-10-08 10:34:54 -0700 | [diff] [blame] | 697 | ICMP6MSGIN_INC_STATS_BH(dev_net(dev), idev, type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | |
| 699 | switch (type) { |
| 700 | case ICMPV6_ECHO_REQUEST: |
| 701 | icmpv6_echo_reply(skb); |
| 702 | break; |
| 703 | |
| 704 | case ICMPV6_ECHO_REPLY: |
| 705 | /* we couldn't care less */ |
| 706 | break; |
| 707 | |
| 708 | case ICMPV6_PKT_TOOBIG: |
| 709 | /* BUGGG_FUTURE: if packet contains rthdr, we cannot update |
| 710 | standard destination cache. Seems, only "advanced" |
| 711 | destination cache will allow to solve this problem |
| 712 | --ANK (980726) |
| 713 | */ |
| 714 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
| 715 | goto discard_it; |
Arnaldo Carvalho de Melo | cc70ab2 | 2007-03-13 14:03:22 -0300 | [diff] [blame] | 716 | hdr = icmp6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | orig_hdr = (struct ipv6hdr *) (hdr + 1); |
| 718 | rt6_pmtu_discovery(&orig_hdr->daddr, &orig_hdr->saddr, dev, |
| 719 | ntohl(hdr->icmp6_mtu)); |
| 720 | |
| 721 | /* |
| 722 | * Drop through to notify |
| 723 | */ |
| 724 | |
| 725 | case ICMPV6_DEST_UNREACH: |
| 726 | case ICMPV6_TIME_EXCEED: |
| 727 | case ICMPV6_PARAMPROB: |
| 728 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); |
| 729 | break; |
| 730 | |
| 731 | case NDISC_ROUTER_SOLICITATION: |
| 732 | case NDISC_ROUTER_ADVERTISEMENT: |
| 733 | case NDISC_NEIGHBOUR_SOLICITATION: |
| 734 | case NDISC_NEIGHBOUR_ADVERTISEMENT: |
| 735 | case NDISC_REDIRECT: |
| 736 | ndisc_rcv(skb); |
| 737 | break; |
| 738 | |
| 739 | case ICMPV6_MGM_QUERY: |
| 740 | igmp6_event_query(skb); |
| 741 | break; |
| 742 | |
| 743 | case ICMPV6_MGM_REPORT: |
| 744 | igmp6_event_report(skb); |
| 745 | break; |
| 746 | |
| 747 | case ICMPV6_MGM_REDUCTION: |
| 748 | case ICMPV6_NI_QUERY: |
| 749 | case ICMPV6_NI_REPLY: |
| 750 | case ICMPV6_MLD2_REPORT: |
| 751 | case ICMPV6_DHAAD_REQUEST: |
| 752 | case ICMPV6_DHAAD_REPLY: |
| 753 | case ICMPV6_MOBILE_PREFIX_SOL: |
| 754 | case ICMPV6_MOBILE_PREFIX_ADV: |
| 755 | break; |
| 756 | |
| 757 | default: |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 758 | LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | |
| 760 | /* informational */ |
| 761 | if (type & ICMPV6_INFOMSG_MASK) |
| 762 | break; |
| 763 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 764 | /* |
| 765 | * error of unknown type. |
| 766 | * must pass to upper level |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | */ |
| 768 | |
| 769 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 770 | } |
| 771 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | kfree_skb(skb); |
| 773 | return 0; |
| 774 | |
| 775 | discard_it: |
Denis V. Lunev | e41b536 | 2008-10-08 10:33:26 -0700 | [diff] [blame] | 776 | ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INERRORS); |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 777 | drop_no_count: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | kfree_skb(skb); |
| 779 | return 0; |
| 780 | } |
| 781 | |
YOSHIFUJI Hideaki | 95e41e9 | 2007-12-06 15:43:30 -0800 | [diff] [blame] | 782 | void icmpv6_flow_init(struct sock *sk, struct flowi *fl, |
| 783 | u8 type, |
| 784 | const struct in6_addr *saddr, |
| 785 | const struct in6_addr *daddr, |
| 786 | int oif) |
| 787 | { |
| 788 | memset(fl, 0, sizeof(*fl)); |
| 789 | ipv6_addr_copy(&fl->fl6_src, saddr); |
| 790 | ipv6_addr_copy(&fl->fl6_dst, daddr); |
| 791 | fl->proto = IPPROTO_ICMPV6; |
| 792 | fl->fl_icmp_type = type; |
| 793 | fl->fl_icmp_code = 0; |
| 794 | fl->oif = oif; |
| 795 | security_sk_classify_flow(sk, fl); |
| 796 | } |
| 797 | |
Ingo Molnar | 640c41c | 2006-08-15 00:06:56 -0700 | [diff] [blame] | 798 | /* |
Denis V. Lunev | b7e729c | 2008-02-29 11:16:08 -0800 | [diff] [blame] | 799 | * Special lock-class for __icmpv6_sk: |
Ingo Molnar | 640c41c | 2006-08-15 00:06:56 -0700 | [diff] [blame] | 800 | */ |
| 801 | static struct lock_class_key icmpv6_socket_sk_dst_lock_key; |
| 802 | |
Denis V. Lunev | 98c6d1b | 2008-02-29 11:21:22 -0800 | [diff] [blame] | 803 | static int __net_init icmpv6_sk_init(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | { |
| 805 | struct sock *sk; |
| 806 | int err, i, j; |
| 807 | |
Denis V. Lunev | 98c6d1b | 2008-02-29 11:21:22 -0800 | [diff] [blame] | 808 | net->ipv6.icmp_sk = |
| 809 | kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); |
| 810 | if (net->ipv6.icmp_sk == NULL) |
Denis V. Lunev | 79c9115 | 2008-02-29 11:17:11 -0800 | [diff] [blame] | 811 | return -ENOMEM; |
| 812 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 813 | for_each_possible_cpu(i) { |
Denis V. Lunev | 1ed8516 | 2008-04-03 14:31:03 -0700 | [diff] [blame] | 814 | err = inet_ctl_sock_create(&sk, PF_INET6, |
| 815 | SOCK_RAW, IPPROTO_ICMPV6, net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | if (err < 0) { |
| 817 | printk(KERN_ERR |
| 818 | "Failed to initialize the ICMP6 control socket " |
| 819 | "(err %d).\n", |
| 820 | err); |
| 821 | goto fail; |
| 822 | } |
| 823 | |
Denis V. Lunev | 1ed8516 | 2008-04-03 14:31:03 -0700 | [diff] [blame] | 824 | net->ipv6.icmp_sk[i] = sk; |
Denis V. Lunev | 5c8cafd | 2008-02-29 11:19:22 -0800 | [diff] [blame] | 825 | |
Ingo Molnar | 640c41c | 2006-08-15 00:06:56 -0700 | [diff] [blame] | 826 | /* |
| 827 | * Split off their lock-class, because sk->sk_dst_lock |
| 828 | * gets used from softirqs, which is safe for |
Denis V. Lunev | b7e729c | 2008-02-29 11:16:08 -0800 | [diff] [blame] | 829 | * __icmpv6_sk (because those never get directly used |
Ingo Molnar | 640c41c | 2006-08-15 00:06:56 -0700 | [diff] [blame] | 830 | * via userspace syscalls), but unsafe for normal sockets. |
| 831 | */ |
| 832 | lockdep_set_class(&sk->sk_dst_lock, |
| 833 | &icmpv6_socket_sk_dst_lock_key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | |
| 835 | /* Enough space for 2 64K ICMP packets, including |
| 836 | * sk_buff struct overhead. |
| 837 | */ |
| 838 | sk->sk_sndbuf = |
| 839 | (2 * ((64 * 1024) + sizeof(struct sk_buff))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | return 0; |
| 842 | |
| 843 | fail: |
Denis V. Lunev | 5c8cafd | 2008-02-29 11:19:22 -0800 | [diff] [blame] | 844 | for (j = 0; j < i; j++) |
Denis V. Lunev | 1ed8516 | 2008-04-03 14:31:03 -0700 | [diff] [blame] | 845 | inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); |
Denis V. Lunev | 98c6d1b | 2008-02-29 11:21:22 -0800 | [diff] [blame] | 846 | kfree(net->ipv6.icmp_sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | return err; |
| 848 | } |
| 849 | |
Denis V. Lunev | 98c6d1b | 2008-02-29 11:21:22 -0800 | [diff] [blame] | 850 | static void __net_exit icmpv6_sk_exit(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | { |
| 852 | int i; |
| 853 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 854 | for_each_possible_cpu(i) { |
Denis V. Lunev | 1ed8516 | 2008-04-03 14:31:03 -0700 | [diff] [blame] | 855 | inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | } |
Denis V. Lunev | 98c6d1b | 2008-02-29 11:21:22 -0800 | [diff] [blame] | 857 | kfree(net->ipv6.icmp_sk); |
| 858 | } |
| 859 | |
Alexey Dobriyan | 8ed7edc | 2008-03-03 12:02:54 -0800 | [diff] [blame] | 860 | static struct pernet_operations icmpv6_sk_ops = { |
Denis V. Lunev | 98c6d1b | 2008-02-29 11:21:22 -0800 | [diff] [blame] | 861 | .init = icmpv6_sk_init, |
| 862 | .exit = icmpv6_sk_exit, |
| 863 | }; |
| 864 | |
| 865 | int __init icmpv6_init(void) |
| 866 | { |
| 867 | int err; |
| 868 | |
| 869 | err = register_pernet_subsys(&icmpv6_sk_ops); |
| 870 | if (err < 0) |
| 871 | return err; |
| 872 | |
| 873 | err = -EAGAIN; |
| 874 | if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) |
| 875 | goto fail; |
| 876 | return 0; |
| 877 | |
| 878 | fail: |
| 879 | printk(KERN_ERR "Failed to register ICMP6 protocol\n"); |
| 880 | unregister_pernet_subsys(&icmpv6_sk_ops); |
| 881 | return err; |
| 882 | } |
| 883 | |
Alexey Dobriyan | 8ed7edc | 2008-03-03 12:02:54 -0800 | [diff] [blame] | 884 | void icmpv6_cleanup(void) |
Denis V. Lunev | 98c6d1b | 2008-02-29 11:21:22 -0800 | [diff] [blame] | 885 | { |
| 886 | unregister_pernet_subsys(&icmpv6_sk_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); |
| 888 | } |
| 889 | |
Denis V. Lunev | 98c6d1b | 2008-02-29 11:21:22 -0800 | [diff] [blame] | 890 | |
Arjan van de Ven | 9b5b5cf | 2005-11-29 16:21:38 -0800 | [diff] [blame] | 891 | static const struct icmp6_err { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | int err; |
| 893 | int fatal; |
| 894 | } tab_unreach[] = { |
| 895 | { /* NOROUTE */ |
| 896 | .err = ENETUNREACH, |
| 897 | .fatal = 0, |
| 898 | }, |
| 899 | { /* ADM_PROHIBITED */ |
| 900 | .err = EACCES, |
| 901 | .fatal = 1, |
| 902 | }, |
| 903 | { /* Was NOT_NEIGHBOUR, now reserved */ |
| 904 | .err = EHOSTUNREACH, |
| 905 | .fatal = 0, |
| 906 | }, |
| 907 | { /* ADDR_UNREACH */ |
| 908 | .err = EHOSTUNREACH, |
| 909 | .fatal = 0, |
| 910 | }, |
| 911 | { /* PORT_UNREACH */ |
| 912 | .err = ECONNREFUSED, |
| 913 | .fatal = 1, |
| 914 | }, |
| 915 | }; |
| 916 | |
| 917 | int icmpv6_err_convert(int type, int code, int *err) |
| 918 | { |
| 919 | int fatal = 0; |
| 920 | |
| 921 | *err = EPROTO; |
| 922 | |
| 923 | switch (type) { |
| 924 | case ICMPV6_DEST_UNREACH: |
| 925 | fatal = 1; |
| 926 | if (code <= ICMPV6_PORT_UNREACH) { |
| 927 | *err = tab_unreach[code].err; |
| 928 | fatal = tab_unreach[code].fatal; |
| 929 | } |
| 930 | break; |
| 931 | |
| 932 | case ICMPV6_PKT_TOOBIG: |
| 933 | *err = EMSGSIZE; |
| 934 | break; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 935 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | case ICMPV6_PARAMPROB: |
| 937 | *err = EPROTO; |
| 938 | fatal = 1; |
| 939 | break; |
| 940 | |
| 941 | case ICMPV6_TIME_EXCEED: |
| 942 | *err = EHOSTUNREACH; |
| 943 | break; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 944 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | |
| 946 | return fatal; |
| 947 | } |
| 948 | |
YOSHIFUJI Hideaki | 7159039 | 2007-02-22 22:05:40 +0900 | [diff] [blame] | 949 | EXPORT_SYMBOL(icmpv6_err_convert); |
| 950 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | #ifdef CONFIG_SYSCTL |
Daniel Lezcano | 760f2d0 | 2008-01-10 02:53:43 -0800 | [diff] [blame] | 952 | ctl_table ipv6_icmp_table_template[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | { |
| 954 | .ctl_name = NET_IPV6_ICMP_RATELIMIT, |
| 955 | .procname = "ratelimit", |
Daniel Lezcano | 41a7690 | 2008-01-10 03:02:40 -0800 | [diff] [blame] | 956 | .data = &init_net.ipv6.sysctl.icmpv6_time, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | .maxlen = sizeof(int), |
| 958 | .mode = 0644, |
Stephen Hemminger | 6dbf4bc | 2008-07-01 19:29:07 -0700 | [diff] [blame] | 959 | .proc_handler = &proc_dointvec_ms_jiffies, |
| 960 | .strategy = &sysctl_ms_jiffies |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | }, |
| 962 | { .ctl_name = 0 }, |
| 963 | }; |
Daniel Lezcano | 760f2d0 | 2008-01-10 02:53:43 -0800 | [diff] [blame] | 964 | |
| 965 | struct ctl_table *ipv6_icmp_sysctl_init(struct net *net) |
| 966 | { |
| 967 | struct ctl_table *table; |
| 968 | |
| 969 | table = kmemdup(ipv6_icmp_table_template, |
| 970 | sizeof(ipv6_icmp_table_template), |
| 971 | GFP_KERNEL); |
YOSHIFUJI Hideaki | 5ee0910 | 2008-02-28 00:24:28 +0900 | [diff] [blame] | 972 | |
| 973 | if (table) |
| 974 | table[0].data = &net->ipv6.sysctl.icmpv6_time; |
| 975 | |
Daniel Lezcano | 760f2d0 | 2008-01-10 02:53:43 -0800 | [diff] [blame] | 976 | return table; |
| 977 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | #endif |
| 979 | |