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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
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1
checksum.h
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@@ -13,6 +13,7 @@ struct icmp6hdr;
uint32_t sum_16b(const void *buf, size_t len);
uint16_t csum_fold(uint32_t sum);
uint16_t csum_unaligned(const void *buf, size_t len, uint32_t init);
void csum_ip4_header(struct iphdr *ip4h);
void csum_udp4(struct udphdr *udp4hr, in_addr_t saddr, in_addr_t daddr,
const void *payload, size_t len);
void csum_icmp4(struct icmphdr *ih, const void *payload, size_t len);