Commit 8de3351e6e0a1081fbf6864ae37839e327699a08
1 parent
58c4fb86ea
Exists in
master
and in
7 other branches
[IPV6]: Try not to send icmp to anycast address.
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Showing 1 changed file with 14 additions and 2 deletions Side-by-side Diff
net/ipv6/icmp.c
| ... | ... | @@ -328,8 +328,10 @@ |
| 328 | 328 | iif = skb->dev->ifindex; |
| 329 | 329 | |
| 330 | 330 | /* |
| 331 | - * Must not send if we know that source is Anycast also. | |
| 332 | - * for now we don't know that. | |
| 331 | + * Must not send error if the source does not uniquely | |
| 332 | + * identify a single node (RFC2463 Section 2.4). | |
| 333 | + * We check unspecified / multicast addresses here, | |
| 334 | + * and anycast addresses will be checked later. | |
| 333 | 335 | */ |
| 334 | 336 | if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { |
| 335 | 337 | LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n"); |
| ... | ... | @@ -373,6 +375,16 @@ |
| 373 | 375 | err = ip6_dst_lookup(sk, &dst, &fl); |
| 374 | 376 | if (err) |
| 375 | 377 | goto out; |
| 378 | + | |
| 379 | + /* | |
| 380 | + * We won't send icmp if the destination is known | |
| 381 | + * anycast. | |
| 382 | + */ | |
| 383 | + if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { | |
| 384 | + LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n"); | |
| 385 | + goto out_dst_release; | |
| 386 | + } | |
| 387 | + | |
| 376 | 388 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) |
| 377 | 389 | goto out; |
| 378 | 390 |