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Add csum_icmp4() helper for calculating ICMP checksums

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Although tap_ip_send() is currently the only place calculating ICMP
checksums, create a helper function for symmetry with ICMPv6.  For
future flexibility it allows the ICMPv6 header and payload to be in
separate buffers.

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 11:43:45 +11:00
committed by Stefano Brivio
parent 7abd2b0d72
commit 67ab617172
3 changed files with 19 additions and 3 deletions
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2
checksum.h
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@@ -6,11 +6,13 @@
#ifndef CHECKSUM_H
#define CHECKSUM_H
struct icmphdr;
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_icmp4(struct icmphdr *ih, const void *payload, size_t len);
void csum_icmp6(struct icmp6hdr *icmp6hr,
const struct in6_addr *saddr, const struct in6_addr *daddr,
const void *payload, size_t len);