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| author |   Eric Dumazet <eric.dumazet@gmail.com> | 2011-12-02 23:41:42 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2011-12-04 01:25:19 -0500 |
| commit | fdf5af0daf8019cec2396cdef8fb042d80fe71fa (patch) | |
| tree | 2423b611659756f2b6553b8d1aa2c117b248c884 /net/ipv4/tcp_input.c | |
| parent | Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/jesse/openvswitch (diff) | |
| download | linux-dev-fdf5af0daf8019cec2396cdef8fb042d80fe71fa.tar.xz linux-dev-fdf5af0daf8019cec2396cdef8fb042d80fe71fa.zip | |
tcp: drop SYN+FIN messages
Denys Fedoryshchenko reported that SYN+FIN attacks were bringing his
linux machines to their limits.
Dont call conn_request() if the TCP flags includes SYN flag
Reported-by: Denys Fedoryshchenko <denys@visp.net.lb>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_input.c')
| -rw-r--r-- | net/ipv4/tcp_input.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 78dd38cd5496..0cbb44076cfa 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -5811,6 +5811,8 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb, goto discard; if (th->syn) { + if (th->fin) + goto discard; if (icsk->icsk_af_ops->conn_request(sk, skb) < 0) return 1; |