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Add csum_ip4_header() helper to calculate IPv4 header checksums

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We calculate IPv4 header checksums in at least two places, in dhcp() and
in tap_ip_send.  Add a helper to handle this calculation in both places.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
David Gibson 2022-10-19 11:43:48 +11:00 • committed by Stefano Brivio
parent bd4be308fc
commit 3d8ccb44a6
4 changed files with 13 additions and 4 deletions

3
tap.c
View file

@ -135,8 +135,7 @@ void tap_ip_send(const struct ctx *c, const struct in6_addr *src, uint8_t proto,
iph->daddr = c->ip4.addr_seen;
memcpy(&iph->saddr, &src->s6_addr[12], 4);
iph->check = 0;
iph->check = csum_unaligned(iph, (size_t)iph->ihl * 4, 0);
csum_ip4_header(iph);
memcpy(data, in, len);