socket: SIOCGIFINDEX

kernel-src/fs/sockfs.c

@@ -137,6 +137,10 @@ static int handle_ifreq(unsigned long request, ifreq_t *uifreq, cred_t *cred) {
 			int mtu = netdev->mtu;
 			return USERCOPY_POSSIBLY_TO_USER(&uifreq->mtu, &mtu, sizeof(mtu));
 		}
+		case SIOCGIFINDEX: {
+			int ifindex = netdev->ifindex;
+			return USERCOPY_POSSIBLY_TO_USER(&uifreq->ifindex, &ifindex, sizeof(ifindex));
+		}
 		case SIOCGIFFLAGS: {
 			short flags = netdev->flags;
 			return USERCOPY_POSSIBLY_TO_USER(&uifreq->flags, &flags, sizeof(flags));
@@ -152,6 +156,7 @@ int sockfs_ioctl(vnode_t *node, unsigned long request, void *arg, int *result, c
 		case SIOCSIFADDR:
 		case SIOCGIFHWADDR:
 		case SIOCGIFMTU:
+		case SIOCGIFINDEX:
 		case SIOCGIFFLAGS:
 			return handle_ifreq(request, arg, cred);
 		case SIOCADDRT: {

kernel-src/include/kernel/abi.h

@@ -184,6 +184,7 @@ typedef struct {
 #define SIOCSIFADDR	0x8916
 #define SIOCGIFMTU 0x8921
 #define SIOCGIFHWADDR 0x8927
+#define SIOCGIFINDEX 0x8933
 #define SIOCADDRT 0x890b
 #define FIONREAD 0x541B
 #define FIONBIO 0x5421
@@ -193,6 +194,7 @@ typedef struct {
 	union {
 		abisockaddr_t addr;
 		int mtu;
+		int ifindex;
 		short flags;
 	};
 } ifreq_t;

kernel-src/include/kernel/net.h

@@ -37,6 +37,7 @@ typedef struct {
 
 typedef struct netdev_t {
 	mac_t mac;
+	int ifindex;
 	size_t mtu;
 	uint32_t ip;
 	int ipcurrid; // XXX This is defined as something per peer. However, having only one of these *should* work for most cases

kernel-src/io/net/netdev.c

@@ -264,6 +264,7 @@ int netdev_register(netdev_t *netdev, char *name) {
 		hashtable_remove(&nametable, name, strlen(name));
 
 	minors[minor] = netdev;
+	netdev->ifindex = minor + 1;
 
 	leave:
 	MUTEX_RELEASE(&tablelock);