Streamline the logic here slightly, by introducing a 'src' temporary for
brevity. We also transform the logic for setting/clearing PORT_LOOPBACK.
This makes udp_update_hdr4() more closely match the corresponding logic
from udp_update_udp6().
Signed-off-by: David Gibson <david(a)gibson.dropbear.id.au>
---
udp.c | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/udp.c b/udp.c
index 78cb221..d7e1020 100644
--- a/udp.c
+++ b/udp.c
@@ -581,6 +581,7 @@ static size_t udp_update_hdr4(const struct ctx *c, int n, in_port_t
dstport,
const struct timespec *now)
{
struct udp4_l2_buf_t *b = &udp4_l2_buf[n];
+ struct in_addr *src;
in_port_t src_port;
size_t ip_len;
@@ -588,26 +589,26 @@ static size_t udp_update_hdr4(const struct ctx *c, int n, in_port_t
dstport,
b->iph.tot_len = htons(ip_len);
+ src = &b->s_in.sin_addr;
src_port = ntohs(b->s_in.sin_port);
if (!IN4_IS_ADDR_UNSPECIFIED(&c->ip4.dns_match) &&
- IN4_ARE_ADDR_EQUAL(&b->s_in.sin_addr, &c->ip4.dns_host) &&
- src_port == 53) {
+ IN4_ARE_ADDR_EQUAL(src, &c->ip4.dns_host) && src_port == 53) {
b->iph.saddr = c->ip4.dns_match.s_addr;
- } else if (IN4_IS_ADDR_LOOPBACK(&b->s_in.sin_addr) ||
- IN4_ARE_ADDR_EQUAL(&b->s_in.sin_addr, &c->ip4.addr_seen)) {
+ } else if (IN4_IS_ADDR_LOOPBACK(src) ||
+ IN4_ARE_ADDR_EQUAL(src, &c->ip4.addr_seen)) {
b->iph.saddr = c->ip4.gw.s_addr;
udp_tap_map[V4][src_port].ts = now->tv_sec;
udp_tap_map[V4][src_port].flags |= PORT_LOCAL;
- if (IN4_ARE_ADDR_EQUAL(&b->s_in.sin_addr.s_addr, &c->ip4.addr_seen))
- udp_tap_map[V4][src_port].flags &= ~PORT_LOOPBACK;
- else
+ if (IN4_IS_ADDR_LOOPBACK(src))
udp_tap_map[V4][src_port].flags |= PORT_LOOPBACK;
+ else
+ udp_tap_map[V4][src_port].flags &= ~PORT_LOOPBACK;
bitmap_set(udp_act[V4][UDP_ACT_TAP], src_port);
} else {
- b->iph.saddr = b->s_in.sin_addr.s_addr;
+ b->iph.saddr = src->s_addr;
}
udp_update_check4(b);
--
2.40.1