[NET]: Allow get/set of dev->weight via netlink.

Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/rtnetlink.h

@@ -565,6 +565,8 @@ enum
 #define IFLA_TXQLEN IFLA_TXQLEN
 	IFLA_MAP,
 #define IFLA_MAP IFLA_MAP
+	IFLA_WEIGHT,
+#define IFLA_WEIGHT IFLA_WEIGHT
 	__IFLA_MAX
 };
 

net/core/rtnetlink.c

@@ -176,6 +176,11 @@ static int rtnetlink_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
 		RTA_PUT(skb, IFLA_TXQLEN, sizeof(txqlen), &txqlen);
 	}
 
+	if (1) {
+		u32 weight = dev->weight;
+		RTA_PUT(skb, IFLA_WEIGHT, sizeof(weight), &weight);
+	}
+
 	if (1) {
 		struct ifmap map = {
 			.mem_start   = dev->mem_start,
@@ -333,6 +338,13 @@ static int do_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 		dev->tx_queue_len = *((u32 *) RTA_DATA(ida[IFLA_TXQLEN - 1]));
 	}
 
+	if (ida[IFLA_WEIGHT - 1]) {
+		if (ida[IFLA_WEIGHT - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
+			goto out;
+
+		dev->weight = *((u32 *) RTA_DATA(ida[IFLA_WEIGHT - 1]));
+	}
+
 	err = 0;
 
 out: