vlan: Use new bridge ioctl()

Legacy ioctl() through SIOCDEVPRIVATE are deprecated. Follow the
approach taken by bridge-utils and make use of new bridge ioctl's
whenever possible.

For example, using legacy ioctl() breaks dynamic VLAN mode on 32-bit
Linux systems running 64-bit kernels.

Signed-off-by: Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>

src/ap/vlan_full.c

@@ -16,6 +16,7 @@
 
 #include "utils/common.h"
 #include "drivers/priv_netlink.h"
+#include "drivers/linux_ioctl.h"
 #include "common/linux_bridge.h"
 #include "common/linux_vlan.h"
 #include "utils/eloop.h"
@@ -143,6 +144,9 @@ static int br_delif(const char *br_name, const char *if_name)
 		return -1;
 	}
 
+	if (linux_br_del_if(fd, br_name, if_name) == 0)
+		goto done;
+
 	if_index = if_nametoindex(if_name);
 
 	if (if_index == 0) {
@@ -168,6 +172,7 @@ static int br_delif(const char *br_name, const char *if_name)
 		return -1;
 	}
 
+done:
 	close(fd);
 	return 0;
 }
@@ -194,6 +199,14 @@ static int br_addif(const char *br_name, const char *if_name)
 		return -1;
 	}
 
+	if (linux_br_add_if(fd, br_name, if_name) == 0)
+		goto done;
+	if (errno == EBUSY) {
+		/* The interface is already added. */
+		close(fd);
+		return 1;
+	}
+
 	if_index = if_nametoindex(if_name);
 
 	if (if_index == 0) {
@@ -224,6 +237,7 @@ static int br_addif(const char *br_name, const char *if_name)
 		return -1;
 	}
 
+done:
 	close(fd);
 	return 0;
 }
@@ -241,6 +255,9 @@ static int br_delbr(const char *br_name)
 		return -1;
 	}
 
+	if (linux_br_del(fd, br_name) == 0)
+		goto done;
+
 	arg[0] = BRCTL_DEL_BRIDGE;
 	arg[1] = (unsigned long) br_name;
 
@@ -252,6 +269,7 @@ static int br_delbr(const char *br_name)
 		return -1;
 	}
 
+done:
 	close(fd);
 	return 0;
 }
@@ -277,6 +295,14 @@ static int br_addbr(const char *br_name)
 		return -1;
 	}
 
+	if (linux_br_add(fd, br_name) == 0)
+		goto done;
+	if (errno == EEXIST) {
+		/* The bridge is already added. */
+		close(fd);
+		return 1;
+	}
+
 	arg[0] = BRCTL_ADD_BRIDGE;
 	arg[1] = (unsigned long) br_name;
 
@@ -294,6 +320,7 @@ static int br_addbr(const char *br_name)
 		}
 	}
 
+done:
 	/* Decrease forwarding delay to avoid EAPOL timeouts. */
 	os_memset(&ifr, 0, sizeof(ifr));
 	os_strlcpy(ifr.ifr_name, br_name, IFNAMSIZ);

src/common/linux_bridge.h

@@ -9,6 +9,21 @@
 #ifndef LINUX_BRIDGE_H
 #define LINUX_BRIDGE_H
 
+/* This ioctl is defined in linux/sockios.h */
+
+#ifndef SIOCBRADDBR
+#define SIOCBRADDBR 0x89a0
+#endif
+#ifndef SIOCBRDELBR
+#define SIOCBRDELBR 0x89a1
+#endif
+#ifndef SIOCBRADDIF
+#define SIOCBRADDIF 0x89a2
+#endif
+#ifndef SIOCBRDELIF
+#define SIOCBRDELIF 0x89a3
+#endif
+
 /* This interface is defined in linux/if_bridge.h */
 
 #define BRCTL_GET_VERSION 0

src/drivers/linux_ioctl.c

@@ -12,6 +12,7 @@
 #include <net/if_arp.h>
 
 #include "utils/common.h"
+#include "common/linux_bridge.h"
 #include "linux_ioctl.h"
 
 
@@ -119,25 +120,14 @@ int linux_set_ifhwaddr(int sock, const char *ifname, const u8 *addr)
 }
 
 
-#ifndef SIOCBRADDBR
-#define SIOCBRADDBR 0x89a0
-#endif
-#ifndef SIOCBRDELBR
-#define SIOCBRDELBR 0x89a1
-#endif
-#ifndef SIOCBRADDIF
-#define SIOCBRADDIF 0x89a2
-#endif
-#ifndef SIOCBRDELIF
-#define SIOCBRDELIF 0x89a3
-#endif
-
-
 int linux_br_add(int sock, const char *brname)
 {
 	if (ioctl(sock, SIOCBRADDBR, brname) < 0) {
+		int saved_errno = errno;
+
 		wpa_printf(MSG_DEBUG, "Could not add bridge %s: %s",
 			   brname, strerror(errno));
+		errno = saved_errno;
 		return -1;
 	}
 
@@ -170,8 +160,11 @@ int linux_br_add_if(int sock, const char *brname, const char *ifname)
 	os_strlcpy(ifr.ifr_name, brname, IFNAMSIZ);
 	ifr.ifr_ifindex = ifindex;
 	if (ioctl(sock, SIOCBRADDIF, &ifr) < 0) {
+		int saved_errno = errno;
+
 		wpa_printf(MSG_DEBUG, "Could not add interface %s into bridge "
 			   "%s: %s", ifname, brname, strerror(errno));
+		errno = saved_errno;
 		return -1;
 	}