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udp: Use existing helper for UDP checksum on inbound IPv6 packets

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Currently we open code the calculation of the UDP checksum in
udp_update_hdr6().  We calling a helper to handle the IPv6 pseudo-header,
and preset the checksum field to 0 so an uninitialised value doesn't get
folded in.  We already have a helper to do this: csum_udp6() which we use
in some slow paths.  Use it here as well.

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 2024-03-06 16:34:28 +11:00 committed by Stefano Brivio
parent ae69838db0
commit 413c15988e
1 changed files with 1 additions and 4 deletions
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5
udp.c
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@ -671,10 +671,7 @@ static size_t udp_update_hdr6(const struct ctx *c, struct udp6_l2_buf_t *b,
b->uh.source = b->s_in6.sin6_port;
b->uh.dest = htons(dstport);
b->uh.len = b->ip6h.payload_len;
b->uh.check = 0;
b->uh.check = csum(&b->uh, payload_len,
proto_ipv6_header_psum(payload_len, IPPROTO_UDP,
src, dst));
csum_udp6(&b->uh, src, dst, b->data, datalen);
return tap_iov_len(c, &b->taph, payload_len + sizeof(b->ip6h));
}