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flow: fix udp checksum

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As per RFC 768, if the calculated UDP checksum is 0, it should be
instead set as 0xFFFF in the frame. A value of 0 in the checksum
field indicates to the receiver that no checksum was calculated
and hence it should not verify the checksum.

Signed-off-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>
This commit is contained in:
Li RongQing
2019-01-25 19:08:33 +08:00
committed by Ben Pfaff
parent 2525148ab3
commit 7a17a07d54
1 changed files with 3 additions and 0 deletions
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3
lib/flow.c
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@@ -3023,6 +3023,9 @@ flow_compose_l4_csum(struct dp_packet *p, const struct flow *flow,
udp->udp_csum = 0; udp->udp_csum = 0;
udp->udp_csum = csum_finish(csum_continue(pseudo_hdr_csum, udp->udp_csum = csum_finish(csum_continue(pseudo_hdr_csum,
udp, l4_len)); udp, l4_len));
if (!udp->udp_csum) {
udp->udp_csum = htons(0xffff);
}
} else if (flow->nw_proto == IPPROTO_ICMP) { } else if (flow->nw_proto == IPPROTO_ICMP) {
struct icmp_header *icmp = dp_packet_l4(p); struct icmp_header *icmp = dp_packet_l4(p);