[PATCH 08/21] net: allow udp connections on specified network device

[Sascha Hauer]

This allows the DHCP code to configure specific network
devices so that DHCP no longer depends on any "current"
network device.

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 include/net.h |  4 ++++
 net/net.c     | 32 ++++++++++++++++++++------------
 2 files changed, 24 insertions(+), 12 deletions(-)

diff --git a/include/net.h b/include/net.h
index e75f64fe75..6788f14cb0 100644
--- a/include/net.h
+++ b/include/net.h
@@ -443,6 +443,10 @@ static inline char *net_alloc_packet(void)
 struct net_connection *net_udp_new(IPaddr_t dest, uint16_t dport,
 		rx_handler_f *handler, void *ctx);
 
+struct net_connection *net_udp_eth_new(struct eth_device *edev, IPaddr_t dest,
+                                       uint16_t dport, rx_handler_f *handler,
+                                       void *ctx);
+
 struct net_connection *net_icmp_new(IPaddr_t dest, rx_handler_f *handler,
 		void *ctx);
 
diff --git a/net/net.c b/net/net.c
index 5f9535fc40..1d47bb449a 100644
--- a/net/net.c
+++ b/net/net.c
@@ -141,9 +141,8 @@ static void arp_handler(struct arprequest *arp)
 	}
 }
 
-static int arp_request(IPaddr_t dest, unsigned char *ether)
+static int arp_request(struct eth_device *edev, IPaddr_t dest, unsigned char *ether)
 {
-	struct eth_device *edev = eth_get_current();
 	char *pkt;
 	struct arprequest *arp;
 	uint64_t arp_start;
@@ -288,15 +287,17 @@ IPaddr_t net_get_gateway(void)
 
 static LIST_HEAD(connection_list);
 
-static struct net_connection *net_new(IPaddr_t dest, rx_handler_f *handler,
-		void *ctx)
+static struct net_connection *net_new(struct eth_device *edev, IPaddr_t dest,
+				      rx_handler_f *handler, void *ctx)
 {
-	struct eth_device *edev = eth_get_current();
 	struct net_connection *con;
 	int ret;
 
-	if (!edev)
-		return ERR_PTR(-ENETDOWN);
+	if (!edev) {
+		edev = eth_get_current();
+		if (!edev)
+			return ERR_PTR(-ENETDOWN);
+	}
 
 	if (!is_valid_ether_addr(edev->ethaddr)) {
 		char str[sizeof("xx:xx:xx:xx:xx:xx")];
@@ -325,7 +326,7 @@ static struct net_connection *net_new(IPaddr_t dest, rx_handler_f *handler,
 	if (dest == 0xffffffff) {
 		memset(con->et->et_dest, 0xff, 6);
 	} else {
-		ret = arp_request(dest, con->et->et_dest);
+		ret = arp_request(edev, dest, con->et->et_dest);
 		if (ret)
 			goto out;
 	}
@@ -349,10 +350,11 @@ out:
 	return ERR_PTR(ret);
 }
 
-struct net_connection *net_udp_new(IPaddr_t dest, uint16_t dport,
-		rx_handler_f *handler, void *ctx)
+struct net_connection *net_udp_eth_new(struct eth_device *edev, IPaddr_t dest,
+				       uint16_t dport, rx_handler_f *handler,
+				       void *ctx)
 {
-	struct net_connection *con = net_new(dest, handler, ctx);
+	struct net_connection *con = net_new(edev, 0xffffffff, handler, ctx);
 
 	if (IS_ERR(con))
 		return con;
@@ -365,10 +367,16 @@ struct net_connection *net_udp_new(IPaddr_t dest, uint16_t dport,
 	return con;
 }
 
+struct net_connection *net_udp_new(IPaddr_t dest, uint16_t dport,
+		rx_handler_f *handler, void *ctx)
+{
+	return net_udp_eth_new(NULL, dest, dport, handler, ctx);
+}
+
 struct net_connection *net_icmp_new(IPaddr_t dest, rx_handler_f *handler,
 		void *ctx)
 {
-	struct net_connection *con = net_new(dest, handler, ctx);
+	struct net_connection *con = net_new(NULL, dest, handler, ctx);
 
 	if (IS_ERR(con))
 		return con;
-- 
2.11.0