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authorEric Dumazet <edumazet@google.com>2014-05-29 08:45:14 -0700
committerBen Hutchings <ben@decadent.org.uk>2014-07-11 13:33:57 +0100
commitbd89ed9b75277f5a16f91a2331539dd34a8cf852 (patch)
tree8a7c303c97dd512489dcad397d0ba84a3d6bcb8a /include
parent30080eb2ea49bff4101b0a3587ae26a590b32c54 (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: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'include')
-rw-r--r--include/net/inetpeer.h9
1 files changed, 1 insertions, 8 deletions
diff --git a/include/net/inetpeer.h b/include/net/inetpeer.h
index 34b06dadca05..ba0ddb0e583f 100644
--- a/include/net/inetpeer.h
+++ b/include/net/inetpeer.h
@@ -115,16 +115,9 @@ static inline void inet_peer_refcheck(const struct inet_peer *p)
/* can be called with or without local BH being disabled */
static inline int inet_getid(struct inet_peer *p, int more)
{
- int old, new;
more++;
inet_peer_refcheck(p);
- do {
- old = atomic_read(&p->ip_id_count);
- new = old + more;
- if (!new)
- new = 1;
- } while (atomic_cmpxchg(&p->ip_id_count, old, new) != old);
- return new;
+ return atomic_add_return(more, &p->ip_id_count) - more;
}
#endif /* _NET_INETPEER_H */