conf, tcp, udp: Allow address specification for forwarded ports

This feature is available in slirp4netns but was missing in passt and
pasta.

Given that we don't do dynamic memory allocation, we need to bind
sockets while parsing port configuration. This means we need to
process all other options first, as they might affect addressing and
IP version support. It also implies a minor rework of how TCP and UDP
implementations bind sockets.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/udp.h b/udp.h
index 4b6f465..f16fe5e 100644
--- a/udp.h
+++ b/udp.h
@@ -12,7 +12,9 @@ void udp_sock_handler(const struct ctx *c, union epoll_ref ref, uint32_t events,
 		      const struct timespec *now);
 int udp_tap_handler(struct ctx *c, int af, const void *addr,
 		    const struct pool *p, const struct timespec *now);
-int udp_sock_init(const struct ctx *c);
+void udp_sock_init(const struct ctx *c, int ns, sa_family_t af,
+		   const void *addr, in_port_t port);
+int udp_init(const struct ctx *c);
 void udp_timer(struct ctx *c, const struct timespec *ts);
 void udp_update_l2_buf(const unsigned char *eth_d, const unsigned char *eth_s,
 		       const uint32_t *ip_da);