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authorFlorian Westphal <fw@strlen.de>2010-06-16 14:42:15 -0700
committerDavid S. Miller <davem@davemloft.net>2010-06-16 14:42:15 -0700
commit8c76368174ed2359739f1b7b8a9c042b1ef839c4 (patch)
tree143aa28c9438b24154bc3d1e36b432a534eca50c /net/ipv6
parent317fe0e6c5dc9448bcef41a2e31fecfd3dba7f55 (diff)
syncookies: check decoded options against sysctl settings
Discard the ACK if we find options that do not match current sysctl settings. Previously it was possible to create a connection with sack, wscale, etc. enabled even if the feature was disabled via sysctl. Also remove an unneeded call to tcp_sack_reset() in cookie_check_timestamp: Both call sites (cookie_v4_check, cookie_v6_check) zero "struct tcp_options_received", hand it to tcp_parse_options() (which does not change tcp_opt->num_sacks/dsack) and then call cookie_check_timestamp(). Even if num_sacks/dsacks were changed, the structure is allocated on the stack and after cookie_check_timestamp returns only a few selected members are copied to the inet_request_sock. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/syncookies.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv6/syncookies.c b/net/ipv6/syncookies.c
index 70d330f8c990..c7ee57421ece 100644
--- a/net/ipv6/syncookies.c
+++ b/net/ipv6/syncookies.c
@@ -180,8 +180,8 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
memset(&tcp_opt, 0, sizeof(tcp_opt));
tcp_parse_options(skb, &tcp_opt, &hash_location, 0);
- if (tcp_opt.saw_tstamp)
- cookie_check_timestamp(&tcp_opt);
+ if (!cookie_check_timestamp(&tcp_opt))
+ goto out;
ret = NULL;
req = inet6_reqsk_alloc(&tcp6_request_sock_ops);