Commit 4e1860a3 authored by Pablo Neira Ayuso's avatar Pablo Neira Ayuso
Browse files

netfilter: nft_payload: do not update layer 4 checksum when mangling fragments 



IP fragments do not come with the transport header, hence skip bogus
layer 4 checksum updates.

Fixes: 18140969 ("netfilter: nft_payload: layer 4 checksum adjustment for pseudoheader fields")
Reported-and-tested-by: default avatarSteffen Weinreich <steve@weinreich.org>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent 1585f590

net/netfilter/nft_payload.c

+3 −0
Original line number Diff line number Diff line
@@ -546,6 +546,9 @@ static int nft_payload_l4csum_offset(const struct nft_pktinfo *pkt, 
				     struct sk_buff *skb,

				     unsigned int *l4csum_offset)

{

	if (pkt->fragoff)

		return -1;



	switch (pkt->tprot) {

	case IPPROTO_TCP:

		*l4csum_offset = offsetof(struct tcphdr, check);