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authorPatrick McHardy <kaber@trash.net>2005-08-20 17:40:41 -0700
committerDavid S. Miller <davem@davemloft.net>2005-08-20 17:40:41 -0700
commit7e71af49d46e4c25f17a2c8f53d62ffd14f01007 (patch)
treea7724eb37fff88f707ebd3e59cc86b8e2b582f4e
parentf93592ff4fa4a55aa7640d435fa93338e190294d (diff)
[NETFILTER]: Fix HW checksum handling in TCPMSS target
Most importantly, remove bogus BUG() in receive path. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv4/netfilter/ipt_TCPMSS.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/net/ipv4/netfilter/ipt_TCPMSS.c b/net/ipv4/netfilter/ipt_TCPMSS.c
index 1049050b2bf..7b84a254440 100644
--- a/net/ipv4/netfilter/ipt_TCPMSS.c
+++ b/net/ipv4/netfilter/ipt_TCPMSS.c
@@ -61,6 +61,10 @@ ipt_tcpmss_target(struct sk_buff **pskb,
if (!skb_ip_make_writable(pskb, (*pskb)->len))
return NF_DROP;
+ if ((*pskb)->ip_summed == CHECKSUM_HW &&
+ skb_checksum_help(*pskb, out == NULL))
+ return NF_DROP;
+
iph = (*pskb)->nh.iph;
tcplen = (*pskb)->len - iph->ihl*4;
@@ -186,9 +190,6 @@ ipt_tcpmss_target(struct sk_buff **pskb,
newmss);
retmodified:
- /* We never hw checksum SYN packets. */
- BUG_ON((*pskb)->ip_summed == CHECKSUM_HW);
-
(*pskb)->nfcache |= NFC_UNKNOWN | NFC_ALTERED;
return IPT_CONTINUE;
}