[NETFILTER]: Fix HW checksum handling in ECN target Signed-off-by: Patrick McHardy --- commit b477e1c6defc1b0e1181350908714e11de5768dd tree c30a6471018a9d8c91cfdcfdf829021428de4842 parent 0fdd261fea7da690726451e22e72845d2bcce50f author Patrick McHardy Sat, 20 Aug 2005 03:34:53 +0200 committer Patrick McHardy Sat, 20 Aug 2005 03:34:53 +0200 net/ipv4/netfilter/ipt_ECN.c | 9 +++++---- 1 files changed, 5 insertions(+), 4 deletions(-) diff --git a/net/ipv4/netfilter/ipt_ECN.c b/net/ipv4/netfilter/ipt_ECN.c --- a/net/ipv4/netfilter/ipt_ECN.c +++ b/net/ipv4/netfilter/ipt_ECN.c @@ -71,6 +71,10 @@ set_ect_tcp(struct sk_buff **pskb, const return 0; tcph = (void *)(*pskb)->nh.iph + (*pskb)->nh.iph->ihl*4; + if ((*pskb)->ip_summed == CHECKSUM_HW && + skb_checksum_help(*pskb, inward)) + return 0; + diffs[0] = ((u_int16_t *)tcph)[6]; if (einfo->operation & IPT_ECN_OP_SET_ECE) tcph->ece = einfo->proto.tcp.ece; @@ -79,13 +83,10 @@ set_ect_tcp(struct sk_buff **pskb, const diffs[1] = ((u_int16_t *)tcph)[6]; diffs[0] = diffs[0] ^ 0xFFFF; - if ((*pskb)->ip_summed != CHECKSUM_HW) + if ((*pskb)->ip_summed != CHECKSUM_UNNECESSARY) tcph->check = csum_fold(csum_partial((char *)diffs, sizeof(diffs), tcph->check^0xFFFF)); - else - if (skb_checksum_help(*pskb, inward)) - return 0; (*pskb)->nfcache |= NFC_ALTERED; return 1; }