Don't use indirect remap functions for conf_ports()

Now that we've delayed initialization of the UDP specific "reverse" map
until udp_init(), the only difference between the various 'remap' functions
used in conf_ports() is which array they target.  So, simplify by open
coding the logic into conf_ports() with a pointer to the correct mapping
array.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

conf.c

@@ -120,24 +120,24 @@ static int conf_ports(struct ctx *c, char optname, const char *optarg,
 {
 	int start_src, end_src, start_dst, end_dst, exclude_only = 1, i, port;
 	char addr_buf[sizeof(struct in6_addr)] = { 0 }, *addr = addr_buf;
-	void (*remap)(struct ctx *c, in_port_t port, in_port_t delta);
 	uint8_t exclude[PORT_BITMAP_SIZE] = { 0 };
 	char buf[BUFSIZ], *sep, *spec, *p;
 	sa_family_t af = AF_UNSPEC;
+	in_port_t *delta;
 	uint8_t *map;
 
 	if (optname == 't') {
 		map = c->tcp.fwd_in.map;
-		remap = tcp_remap_to_tap;
+		delta = c->tcp.fwd_in.delta;
 	} else if (optname == 'T') {
 		map = c->tcp.fwd_out.map;
-		remap = tcp_remap_to_init;
+		delta = c->tcp.fwd_out.delta;
 	} else if (optname == 'u') {
 		map = c->udp.fwd_in.f.map;
-		remap = udp_remap_to_tap;
+		delta = c->udp.fwd_in.f.delta;
 	} else if (optname == 'U') {
 		map = c->udp.fwd_out.f.map;
-		remap = udp_remap_to_init;
+		delta = c->udp.fwd_out.f.delta;
 	} else {	/* For gcc -O3 */
 		return 0;
 	}
@@ -365,8 +365,8 @@ static int conf_ports(struct ctx *c, char optname, const char *optarg,
 
 				if (start_dst != -1) {
 					/* 80:8080 or 22-80:8080:8080 */
-					remap(c, i, (in_port_t)(start_dst -
+					delta[i] = (in_port_t)(start_dst -
-								start_src));
+							       start_src);
 				}
 
 				if (optname == 't')

tcp.c

@@ -948,28 +948,6 @@ static void conn_event_do(const struct ctx *c, struct tcp_conn *conn,
 		conn_event_do(c, conn, event);				\
 	} while (0)
 
-/**
- * tcp_remap_to_tap() - Set delta for port translation toward guest/tap
- * @c:		Execution context
- * @port:	Original destination port, host order
- * @delta:	Delta to be added to original destination port
- */
-void tcp_remap_to_tap(struct ctx *c, in_port_t port, in_port_t delta)
-{
-	c->tcp.fwd_in.delta[port] = delta;
-}
-
-/**
- * tcp_remap_to_tap() - Set delta for port translation toward init namespace
- * @c:		Execution context
- * @port:	Original destination port, host order
- * @delta:	Delta to be added to original destination port
- */
-void tcp_remap_to_init(struct ctx *c, in_port_t port, in_port_t delta)
-{
-	c->tcp.fwd_out.delta[port] = delta;
-}
-
 /**
  * tcp_rtt_dst_low() - Check if low RTT was seen for connection endpoint
  * @conn:	Connection pointer

tcp.h

@@ -29,8 +29,6 @@ void tcp_defer_handler(struct ctx *c);
 void tcp_sock_set_bufsize(const struct ctx *c, int s);
 void tcp_update_l2_buf(const unsigned char *eth_d, const unsigned char *eth_s,
 		       const uint32_t *ip_da);
-void tcp_remap_to_tap(struct ctx *c, in_port_t port, in_port_t delta);
-void tcp_remap_to_init(struct ctx *c, in_port_t port, in_port_t delta);
 
 /**
  * union tcp_epoll_ref - epoll reference portion for TCP connections

udp.c

@@ -258,28 +258,6 @@ static struct mmsghdr	udp_mmh_send		[UDP_SPLICE_FRAMES];
 static struct iovec	udp_iov_sendto		[UDP_SPLICE_FRAMES];
 static struct mmsghdr	udp_mmh_sendto		[UDP_SPLICE_FRAMES];
 
-/**
- * udp_remap_to_tap() - Set delta for port translation to/from guest/tap
- * @c:		Execution context
- * @port:	Original destination port, host order
- * @delta:	Delta to be added to original destination port
- */
-void udp_remap_to_tap(struct ctx *c, in_port_t port, in_port_t delta)
-{
-	c->udp.fwd_in.f.delta[port] = delta;
-}
-
-/**
- * udp_remap_to_init() - Set delta for port translation to/from init namespace
- * @c:		Execution context
- * @port:	Original destination port, host order
- * @delta:	Delta to be added to original destination port
- */
-void udp_remap_to_init(struct ctx *c, in_port_t port, in_port_t delta)
-{
-	c->udp.fwd_out.f.delta[port] = delta;
-}
-
 /**
  * udp_invert_portmap() - Compute reverse port translations for return packets
  * @fwd:	Port forwarding configuration to compute reverse map for

udp.h

@@ -18,8 +18,6 @@ int udp_init(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);
-void udp_remap_to_tap(struct ctx *c, in_port_t port, in_port_t delta);
-void udp_remap_to_init(struct ctx *c, in_port_t port, in_port_t delta);
 
 /**
  * union udp_epoll_ref - epoll reference portion for TCP connections