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udp: Avoid unnecessary pointer in udp_update_hdr4()

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We carry around the source address as a pointer to a constant struct
in_addr.  But it's silly to carry around a 4 or 8 byte pointer to a 4 byte
IPv4 address.  Just copy the IPv4 address around by value.

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 16:34:27 +11:00 committed by Stefano Brivio
parent b0419d150a
commit ae69838db0
1 changed files with 9 additions and 9 deletions
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18
udp.c
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@ -575,32 +575,32 @@ static size_t udp_update_hdr4(const struct ctx *c, struct udp4_l2_buf_t *b,
const struct timespec *now)
{
size_t ip_len = datalen + sizeof(b->iph) + sizeof(b->uh);
const struct in_addr *src = &b->s_in.sin_addr;
in_port_t srcport = ntohs(b->s_in.sin_port);
struct in_addr src = b->s_in.sin_addr;
if (!IN4_IS_ADDR_UNSPECIFIED(&c->ip4.dns_match) &&
IN4_ARE_ADDR_EQUAL(src, &c->ip4.dns_host) && srcport == 53) {
src = &c->ip4.dns_match;
} else if (IN4_IS_ADDR_LOOPBACK(src) ||
IN4_ARE_ADDR_EQUAL(src, &c->ip4.addr_seen)) {
IN4_ARE_ADDR_EQUAL(&src, &c->ip4.dns_host) && srcport == 53) {
src = c->ip4.dns_match;
} else if (IN4_IS_ADDR_LOOPBACK(&src) ||
IN4_ARE_ADDR_EQUAL(&src, &c->ip4.addr_seen)) {
udp_tap_map[V4][srcport].ts = now->tv_sec;
udp_tap_map[V4][srcport].flags |= PORT_LOCAL;
if (IN4_IS_ADDR_LOOPBACK(src))
if (IN4_IS_ADDR_LOOPBACK(&src))
udp_tap_map[V4][srcport].flags |= PORT_LOOPBACK;
else
udp_tap_map[V4][srcport].flags &= ~PORT_LOOPBACK;
bitmap_set(udp_act[V4][UDP_ACT_TAP], srcport);
src = &c->ip4.gw;
src = c->ip4.gw;
}
b->iph.tot_len = htons(ip_len);
b->iph.daddr = c->ip4.addr_seen.s_addr;
b->iph.saddr = src->s_addr;
b->iph.saddr = src.s_addr;
b->iph.check = csum_ip4_header(b->iph.tot_len, IPPROTO_UDP,
*src, c->ip4.addr_seen);
src, c->ip4.addr_seen);
b->uh.source = b->s_in.sin_port;
b->uh.dest = htons(dstport);