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

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

Fixes: 1814096980 ("netfilter: nft_payload: layer 4 checksum adjustment for pseudoheader fields")
Reported-and-tested-by: Steffen Weinreich <steve@weinreich.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2022-01-05 16:09:57 +01:00
parent 1585f590a2
commit 4e1860a386
1 changed files with 3 additions and 0 deletions
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3
net/netfilter/nft_payload.c
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@ -546,6 +546,9 @@ static int nft_payload_l4csum_offset(const struct nft_pktinfo *pkt,
struct sk_buff *skb, struct sk_buff *skb,
unsigned int *l4csum_offset) unsigned int *l4csum_offset)
{ {
if (pkt->fragoff)
return -1;
switch (pkt->tprot) { switch (pkt->tprot) {
case IPPROTO_TCP: case IPPROTO_TCP:
*l4csum_offset = offsetof(struct tcphdr, check); *l4csum_offset = offsetof(struct tcphdr, check);