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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
dhcp.c
View file

@ -371,8 +371,7 @@ int dhcp(const struct ctx *c, const struct pool *p)
iph->tot_len = htons(len += sizeof(*iph));
iph->daddr = c->ip4.addr;
iph->saddr = c->ip4.gw;
iph->check = 0;
iph->check = csum_unaligned(iph, (intptr_t)(iph->ihl * 4), 0);
csum_ip4_header(iph);
len += sizeof(*eh);
memcpy(eh->h_dest, eh->h_source, ETH_ALEN);