netdev: rudimentary getinfo ioctl

kernel-src/io/net/netdev.c

@@ -4,23 +4,85 @@
 #include <mutex.h>
 #include <string.h>
 #include <logging.h>
+#include <kernel/usercopy.h>
+#include <kernel/sock.h>
+
+static int current_minor;
+static netdev_t *minors[64];
 
 HASHTABLE_DEFINE_STATIC(nametable, 10);
 static MUTEX_DEFINE(tablelock);
 
-static devops_t devops = {0};
+typedef struct {
+	abisockaddr_t addr;
+	abisockaddr_t broadaddr;
+	abisockaddr_t netmask;
+	abisockaddr_t hwaddr;
+	short flags;
+	int mtu;
+} net_info_t;
+
+static int netdev_ioctl(int minor, unsigned long request, void *arg, int *result, cred_t *cred) {
+	netdev_t *netdev = minors[minor];
+	if (netdev == NULL)
+		return ENODEV;
+
+	switch (request) {
+		case 0x1337631: {
+			net_info_t *info = arg;
+			sockaddr_t addr = {0};
+			abisockaddr_t abisockaddr;
+			short flags = netdev->flags;
+			int mtu = netdev->mtu;
+
+			addr.ipv4addr.addr = netdev->ip;
+			sock_addrtoabiaddr(SOCKET_TYPE_UDP, &addr, &abisockaddr);
+			int error = USERCOPY_POSSIBLY_TO_USER(&info->addr, &abisockaddr, sizeof(abisockaddr));
+			if (error)
+				return error;
+
+			error = USERCOPY_POSSIBLY_TO_USER(&info->hwaddr, &netdev->mac, sizeof(netdev->mac));
+			if (error)
+				return error;
+
+			error = USERCOPY_POSSIBLY_TO_USER(&info->mtu, &mtu, sizeof(mtu));
+			if (error)
+				return error;
+
+			error = USERCOPY_POSSIBLY_TO_USER(&info->flags, &flags, sizeof(flags));
+			if (error)
+				return error;
+
+			// TODO broadaddr
+			// TODO netmask
+
+			break;
+		}
+		default:
+			return ENOTTY;
+	}
+
+	return 0;
+}
+
+static devops_t devops = {
+	.ioctl = netdev_ioctl
+};
 
 int netdev_register(netdev_t *netdev, char *name) {
+	int minor = __atomic_fetch_add(&current_minor, 1, __ATOMIC_RELAXED);
 	MUTEX_ACQUIRE(&tablelock);
 	int e = hashtable_set(&nametable, netdev, name, strlen(name), true);
 	if (e)
 		goto leave;
 
 
-	e = devfs_register(&devops, name, V_TYPE_CHDEV, DEV_MAJOR_NET, 0, 0600, NULL);
+	e = devfs_register(&devops, name, V_TYPE_CHDEV, DEV_MAJOR_NET, minor, 0600, NULL);
 	if (e)
 		hashtable_remove(&nametable, name, strlen(name));
 
+	minors[minor] = netdev;
+
 	leave:
 	MUTEX_RELEASE(&tablelock);
 	return e;