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/tcp.h b/tcp.h
index 99edf81..7b720c1 100644
--- a/tcp.h
+++ b/tcp.h
@@ -20,7 +20,9 @@ void tcp_sock_handler(struct ctx *c, union epoll_ref ref, uint32_t events,
 		      const struct timespec *now);
 int tcp_tap_handler(struct ctx *c, int af, const void *addr,
 		    const struct pool *p, const struct timespec *now);
-int tcp_sock_init(struct ctx *c);
+void tcp_sock_init(const struct ctx *c, int ns, sa_family_t af,
+		   const void *addr, in_port_t port);
+int tcp_init(struct ctx *c);
 void tcp_timer(struct ctx *c, const struct timespec *ts);
 void tcp_defer_handler(struct ctx *c);