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authorEric Dumazet <edumazet@google.com>2014-05-29 08:45:14 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-06-26 15:12:38 -0400
commit25bc3126ccbe553b5cc293ca9c77d44bb40ff62d (patch)
tree13185c86e049c5ceb62e4798bd0f1b3ebf78381d /net
parent57b1ec6058e6633724817c9d001330a9fea9d39c (diff)
net: fix inet_getid() and ipv6_select_ident() bugs
[ Upstream commit 39c36094d78c39e038c1e499b2364e13bce36f54 ] I noticed we were sending wrong IPv4 ID in TCP flows when MTU discovery is disabled. Note how GSO/TSO packets do not have monotonically incrementing ID. 06:37:41.575531 IP (id 14227, proto: TCP (6), length: 4396) 06:37:41.575534 IP (id 14272, proto: TCP (6), length: 65212) 06:37:41.575544 IP (id 14312, proto: TCP (6), length: 57972) 06:37:41.575678 IP (id 14317, proto: TCP (6), length: 7292) 06:37:41.575683 IP (id 14361, proto: TCP (6), length: 63764) It appears I introduced this bug in linux-3.1. inet_getid() must return the old value of peer->ip_id_count, not the new one. Lets revert this part, and remove the prevention of a null identification field in IPv6 Fragment Extension Header, which is dubious and not even done properly. Fixes: 87c48fa3b463 ("ipv6: make fragment identifications less predictable") Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/output_core.c11
1 files changed, 3 insertions, 8 deletions
diff --git a/net/ipv6/output_core.c b/net/ipv6/output_core.c
index c2e73e647e44..3d2c81a66d6a 100644
--- a/net/ipv6/output_core.c
+++ b/net/ipv6/output_core.c
@@ -9,7 +9,7 @@
void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt)
{
static atomic_t ipv6_fragmentation_id;
- int old, new;
+ int ident;
#if IS_ENABLED(CONFIG_IPV6)
if (rt && !(rt->dst.flags & DST_NOPEER)) {
@@ -25,13 +25,8 @@ void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt)
}
}
#endif
- do {
- old = atomic_read(&ipv6_fragmentation_id);
- new = old + 1;
- if (!new)
- new = 1;
- } while (atomic_cmpxchg(&ipv6_fragmentation_id, old, new) != old);
- fhdr->identification = htonl(new);
+ ident = atomic_inc_return(&ipv6_fragmentation_id);
+ fhdr->identification = htonl(ident);
}
EXPORT_SYMBOL(ipv6_select_ident);