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| author | 배석진 <soukjin.bae@samsung.com> | 2018-11-09 16:53:06 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-11-09 20:01:21 -0800 |
| commit | 62230715fd2453b3ba948c9d83cfb3ada9169169 (patch) | |
| tree | 661b09b8456959419d4be214b59a2772804ec7e0 | |
| parent | d02854dc1999ed3e7fd79ec700c64ac23ac0c458 (diff) | |
| download | lwn-62230715fd2453b3ba948c9d83cfb3ada9169169.tar.gz lwn-62230715fd2453b3ba948c9d83cfb3ada9169169.zip | |
flow_dissector: do not dissect l4 ports for fragments
Only first fragment has the sport/dport information,
not the following ones.
If we want consistent hash for all fragments, we need to
ignore ports even for first fragment.
This bug is visible for IPv6 traffic, if incoming fragments
do not have a flow label, since skb_get_hash() will give
different results for first fragment and following ones.
It is also visible if any routing rule wants dissection
and sport or dport.
See commit 5e5d6fed3741 ("ipv6: route: dissect flow
in input path if fib rules need it") for details.
[edumazet] rewrote the changelog completely.
Fixes: 06635a35d13d ("flow_dissect: use programable dissector in skb_flow_dissect and friends")
Signed-off-by: 배석진 <soukjin.bae@samsung.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/core/flow_dissector.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c index 676f3ad629f9..588f475019d4 100644 --- a/net/core/flow_dissector.c +++ b/net/core/flow_dissector.c @@ -1166,8 +1166,8 @@ ip_proto_again: break; } - if (dissector_uses_key(flow_dissector, - FLOW_DISSECTOR_KEY_PORTS)) { + if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_PORTS) && + !(key_control->flags & FLOW_DIS_IS_FRAGMENT)) { key_ports = skb_flow_dissector_target(flow_dissector, FLOW_DISSECTOR_KEY_PORTS, target_container); |