net/netlink/netlink_route.c: Add support for the NETLINK_ROUTE RTM_GETLINK command that is used to obtain a list of all devices in the UP state.

include/netpacket/netlink.h

@@ -235,11 +235,17 @@
 #define NLMSG_ALIGN(n)    (((n) + NLMSG_MASK) & ~NLMSG_MASK)
 #define NLMSG_HDRLEN      sizeof(struct nlmsghdr)
 #define NLMSG_LENGTH(n)   (NLMSG_HDRLEN + (n))
-#define NLMSG_DATA(hdr)   ((FAR void*)(((FAR char*)hdr) + NLMSG_HDRLEN)
+#define NLMSG_DATA(hdr)   ((FAR void*)(((FAR char*)hdr) + NLMSG_HDRLEN))
 #define NLMSG_NEXT(hdr,n) \
   ((n) -= NLMSG_ALIGN((hdr)->nlmsg_len), \
    (FAR struct nlmsghdr*)(((FAR cha r*)(hdr)) + NLMSG_ALIGN((hdr)->nlmsg_len)))
 
+#define NLMSG_NOOP         1   /* Nothing */
+#define NLMSG_ERROR        2   /* Error */
+#define NLMSG_DONE         3   /* End of a dump */
+#define NLMSG_OVERRUN      4   /* Data lost */
+#define NLMSG_MIN_TYPE     16  /* < 16:  Reserved control messages */
+
 /* Definitions for struct rtattr ********************************************/
 
 /* Macros to handle rtattributes */
@@ -265,8 +271,19 @@
  * address set by the user and other undocumented flags.
  */
 
-#define IFA_F_SECONDARY      0x01
-#define IFA_F_PERMANENT      0x02
+#define IFA_F_SECONDARY   0x01
+#define IFA_F_PERMANENT   0x02
+
+/* Definitions for struct ifinfomsg *****************************************/
+
+#define IFLA_RTA(r)       ((FAR struct rtattr *) \
+                           (((FAR char *)(r)) + \
+                            NLMSG_ALIGN(sizeof(struct ifinfomsg))))
+#define IFLA_PAYLOAD(n)   NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg))
+
+/* Values for rta_type */
+
+#define IFLA_IFNAME       1
 
 /****************************************************************************
  * Public Type Definitions
@@ -318,13 +335,21 @@ struct rtattr
 
 struct ifinfomsg
 {
-  uint8_t ifi_family;    /* AF_UNSPEC */
-  uint16_t ifi_type;     /* Device type */
-  int16_t ifi_index;     /* Unique interface index */
-  uint32_t ifi_flags;    /* Device flags  */
+  uint8_t  ifi_family;   /* AF_UNSPEC */
+  uint8_t  ifi_pid;
+  uint16_t ifi_type;     /* Device type (ARPHRD) */
+  int16_t  ifi_index;    /* Unique interface index */
+  uint32_t ifi_flags;    /* Device IFF_* flags  */
   uint32_t ifi_change;   /* Change mask, must always be 0xffffffff */
 };
 
+/* General form of address family dependent message. */
+
+struct rtgenmsg
+{
+  unsigned char rtgen_family;
+};
+
 /* RTM_NEWADDR, RTM_DELADDR, RTM_GETADDR
  *
  * Add, remove or receive information about an IP address associated with

include/sys/socket.h

@@ -54,16 +54,17 @@
 
 /* Supported Protocol Families */
 
-#define PF_UNSPEC      0 /* Protocol family unspecified */
-#define PF_UNIX        1 /* Local communication */
-#define PF_LOCAL       1 /* Local communication */
-#define PF_INET        2 /* IPv4 Internet protocols */
-#define PF_INET6      10 /* IPv6 Internet protocols */
-#define PF_NETLINK    16 /* Netlink IPC socket */
-#define PF_PACKET     17 /* Low level packet interface */
-#define PF_BLUETOOTH  31 /* Bluetooth sockets */
-#define PF_IEEE802154 36 /* Low level IEEE 802.15.4 radio frame interface */
-#define PF_PKTRADIO   64 /* Low level packet radio interface */
+#define PF_UNSPEC      0         /* Protocol family unspecified */
+#define PF_UNIX        1         /* Local communication */
+#define PF_LOCAL       1         /* Local communication */
+#define PF_INET        2         /* IPv4 Internet protocols */
+#define PF_INET6      10         /* IPv6 Internet protocols */
+#define PF_NETLINK    16         /* Netlink IPC socket */
+#define PF_ROUTE      PF_NETLINK /* 4.4BSD Compatibility*/
+#define PF_PACKET     17         /* Low level packet interface */
+#define PF_BLUETOOTH  31         /* Bluetooth sockets */
+#define PF_IEEE802154 36         /* Low level IEEE 802.15.4 radio frame interface */
+#define PF_PKTRADIO   64         /* Low level packet radio interface */
 
 /* Supported Address Families. Opengroup.org requires only AF_UNSPEC,
  * AF_UNIX, AF_INET and AF_INET6.
@@ -75,6 +76,7 @@
 #define AF_INET        PF_INET
 #define AF_INET6       PF_INET6
 #define AF_NETLINK     PF_NETLINK
+#define AF_ROUTE       PF_ROUTE
 #define AF_PACKET      PF_PACKET
 #define AF_BLUETOOTH   PF_BLUETOOTH
 #define AF_IEEE802154  PF_IEEE802154