Messages in this thread Patch in this message | | | From | Kevin Mitchell <> | Subject | [PATCH 1/1] netfilter: conntrack: mark UDP zero checksum as CHECKSUM_UNNECESSARY | Date | Fri, 14 Jan 2022 20:00:50 -0800 |
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The udp_error function verifies the checksum of incoming UDP packets if one is set. This has the desirable side effect of setting skb->ip_summed to CHECKSUM_COMPLETE, signalling that this verification need not be repeated further up the stack.
Conversely, when the UDP checksum is empty, which is perfectly legal (at least inside IPv4), udp_error previously left no trace that the checksum had been deemed acceptable.
This was a problem in particular for nf_reject_ipv4, which verifies the checksum in nf_send_unreach() before sending ICMP_DEST_UNREACH. It makes no accommodation for zero UDP checksums unless they are already marked as CHECKSUM_UNNECESSARY.
This commit ensures packets with empty UDP checksum are marked as CHECKSUM_UNNECESSARY, which is explicitly recommended in skbuff.h.
Signed-off-by: Kevin Mitchell <kevmitch@arista.com> --- net/netfilter/nf_conntrack_proto_udp.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/net/netfilter/nf_conntrack_proto_udp.c b/net/netfilter/nf_conntrack_proto_udp.c index 3b516cffc779..12f793d8fe0c 100644 --- a/net/netfilter/nf_conntrack_proto_udp.c +++ b/net/netfilter/nf_conntrack_proto_udp.c @@ -63,8 +63,10 @@ static bool udp_error(struct sk_buff *skb, } /* Packet with no checksum */ - if (!hdr->check) + if (!hdr->check) { + skb->ip_summed = CHECKSUM_UNNECESSARY; return false; + } /* Checksum invalid? Ignore. * We skip checking packets on the outgoing path -- 2.34.1
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