diff options
| author | Eric Dumazet <[email protected]> | 2015-06-04 06:49:21 +0000 |
|---|---|---|
| committer | David S. Miller <[email protected]> | 2015-06-04 08:04:40 +0000 |
| commit | 12e25e1041d044d4204f2b7c54695e14e8ffb282 (patch) | |
| tree | 9ebfb1b3d4ba5a1c6bca7c66ee2454686e2a25d2 /net/ipv6/tcp_ipv6.c | |
| parent | Merge branch 'switchdev-next' (diff) | |
| download | kernel-12e25e1041d044d4204f2b7c54695e14e8ffb282.tar.gz kernel-12e25e1041d044d4204f2b7c54695e14e8ffb282.zip | |
tcp: remove redundant checks
tcp_v4_rcv() checks the following before calling tcp_v4_do_rcv():
if (th->doff < sizeof(struct tcphdr) / 4)
goto bad_packet;
if (!pskb_may_pull(skb, th->doff * 4))
goto discard_it;
So following check in tcp_v4_do_rcv() is redundant
and "goto csum_err;" is wrong anyway.
if (skb->len < tcp_hdrlen(skb) || ...)
goto csum_err;
A second check can be removed after no_tcp_socket label for same reason.
Same tests can be removed in tcp_v6_do_rcv()
Note : short tcp frames are not properly accounted in tcpInErrs MIB,
because pskb_may_pull() failure simply drops incoming skb, we might
fix this in a separate patch.
Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Diffstat (limited to 'net/ipv6/tcp_ipv6.c')
| -rw-r--r-- | net/ipv6/tcp_ipv6.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 7be3d858cbf0..b72e1ffc6bb4 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -1250,7 +1250,7 @@ static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) return 0; } - if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) + if (tcp_checksum_complete(skb)) goto csum_err; if (sk->sk_state == TCP_LISTEN) { @@ -1442,7 +1442,7 @@ no_tcp_socket: tcp_v6_fill_cb(skb, hdr, th); - if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { + if (tcp_checksum_complete(skb)) { csum_error: TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS); bad_packet: |