diff options
| author | Gilad Ben-Yossef | 2009-10-28 05:15:24 +0100 |
|---|---|---|
| committer | David S. Miller | 2009-10-29 09:28:44 +0100 |
| commit | 1aba721eba1d84a2defce45b950272cee1e6c72a (patch) | |
| tree | 73a882e5147cd7384bea0533dea8b2a5f51ad325 /net/ipv4/tcp_output.c | |
| parent | Add dst_feature to query route entry features (diff) | |
| download | kernel-qcow2-linux-1aba721eba1d84a2defce45b950272cee1e6c72a.tar.gz kernel-qcow2-linux-1aba721eba1d84a2defce45b950272cee1e6c72a.tar.xz kernel-qcow2-linux-1aba721eba1d84a2defce45b950272cee1e6c72a.zip | |
Add the no SACK route option feature
Implement querying and acting upon the no sack bit in the features
field.
Signed-off-by: Gilad Ben-Yossef <gilad@codefidence.com>
Sigend-off-by: Ori Finkelman <ori@comsleep.com>
Sigend-off-by: Yony Amit <yony@comsleep.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_output.c')
| -rw-r--r-- | net/ipv4/tcp_output.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 2e2eb74ac4cc..b35802af3c4c 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -464,6 +464,7 @@ static unsigned tcp_syn_options(struct sock *sk, struct sk_buff *skb, struct tcp_md5sig_key **md5) { struct tcp_sock *tp = tcp_sk(sk); unsigned size = 0; + struct dst_entry *dst = __sk_dst_get(sk); #ifdef CONFIG_TCP_MD5SIG *md5 = tp->af_specific->md5_lookup(sk, sk); @@ -498,7 +499,8 @@ static unsigned tcp_syn_options(struct sock *sk, struct sk_buff *skb, opts->options |= OPTION_WSCALE; size += TCPOLEN_WSCALE_ALIGNED; } - if (likely(sysctl_tcp_sack)) { + if (likely(sysctl_tcp_sack && + !dst_feature(dst, RTAX_FEATURE_NO_SACK))) { opts->options |= OPTION_SACK_ADVERTISE; if (unlikely(!(OPTION_TS & opts->options))) size += TCPOLEN_SACKPERM_ALIGNED; |