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tcp: fix tcp header size miscalculation when window scale is unused 

The size of the TCP header is miscalculated when the window scale ends
up being 0. Additionally, this can be induced by sending a SYN to a
passive open port with a window scale option with value 0.

Signed-off-by: Philip Love <love_phil@emc.com>
Signed-off-by: Adam Langley <agl@imperialviolet.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Philip Love 2008-08-27 02:33:50 -07:00 committed by David S. Miller
parent fe439dd09d
commit 7982d5e1b3
1 changed files with 4 additions and 2 deletions
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6
net/ipv4/tcp_output.c
View File

@ -468,7 +468,8 @@ static unsigned tcp_syn_options(struct sock *sk, struct sk_buff *skb,
} }
if (likely(sysctl_tcp_window_scaling)) { if (likely(sysctl_tcp_window_scaling)) {
opts->ws = tp->rx_opt.rcv_wscale; opts->ws = tp->rx_opt.rcv_wscale;
size += TCPOLEN_WSCALE_ALIGNED; if(likely(opts->ws))
size += TCPOLEN_WSCALE_ALIGNED;
} }
if (likely(sysctl_tcp_sack)) { if (likely(sysctl_tcp_sack)) {
opts->options |= OPTION_SACK_ADVERTISE; opts->options |= OPTION_SACK_ADVERTISE;
@ -509,7 +510,8 @@ static unsigned tcp_synack_options(struct sock *sk,
if (likely(ireq->wscale_ok)) { if (likely(ireq->wscale_ok)) {
opts->ws = ireq->rcv_wscale; opts->ws = ireq->rcv_wscale;
size += TCPOLEN_WSCALE_ALIGNED; if(likely(opts->ws))
size += TCPOLEN_WSCALE_ALIGNED;
} }
if (likely(doing_ts)) { if (likely(doing_ts)) {
opts->options |= OPTION_TS; opts->options |= OPTION_TS;