release/src/router/radvd/netlink.c

   1 /*
   2  *   $Id: netlink.c,v 1.1 2011/02/25 04:17:23 reubenhwk Exp $
   3  *
   4  *   Authors:
   5  *    Lars Fenneberg            <lf@elemental.net>
   6  *    Reuben Hawkins            <reubenhwk@gmail.com>
   7  *
   8  *   This software is Copyright 1996,1997 by the above mentioned author(s),
   9  *   All Rights Reserved.
  10  *
  11  *   The license which is distributed with this software in the file COPYRIGHT
  12  *   applies to this software. If your distribution is missing this file, you
  13  *   may request it from <pekkas@netcore.fi>.
  14  *
  15  */
  16
  17 #include "config.h"
  18 #include "radvd.h"
  19 #include "log.h"
  20 #include "netlink.h"
  21
  22 #include <asm/types.h>
  23 #include <sys/socket.h>
  24 #include <linux/netlink.h>
  25 #include <linux/rtnetlink.h>
  26 #include <net/if.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <errno.h>
  30 #include <string.h>
  31
  32 void process_netlink_msg(int sock)
  33 {
  34         int len;
  35         char buf[4096];
  36         struct iovec iov = { buf, sizeof(buf) };
  37         struct sockaddr_nl sa;
  38         struct msghdr msg = { (void *)&sa, sizeof(sa), &iov, 1, NULL, 0, 0 };
  39         struct nlmsghdr *nh;
  40         struct ifinfomsg * ifinfo;
  41         char ifname[IF_NAMESIZE] = {""};
  42         char * rc = 0;
  43
  44         len = recvmsg (sock, &msg, 0);
  45         if (len == -1) {
  46                 flog(LOG_ERR, "recvmsg failed: %s", strerror(errno));
  47         }
  48
  49         for (nh = (struct nlmsghdr *) buf; NLMSG_OK (nh, len); nh = NLMSG_NEXT (nh, len)) {
  50                 /* The end of multipart message. */
  51                 if (nh->nlmsg_type == NLMSG_DONE)
  52                         return;
  53
  54                 if (nh->nlmsg_type == NLMSG_ERROR) {
  55                         flog(LOG_ERR, "%s:%d Some type of netlink error.\n", __FILE__, __LINE__);
  56                         abort();
  57                 }
  58
  59                 /* Continue with parsing payload. */
  60                 ifinfo = NLMSG_DATA(nh);
  61                 rc = if_indextoname(ifinfo->ifi_index, ifname);
  62                 if (ifinfo->ifi_flags & IFF_RUNNING) {
  63                         dlog(LOG_DEBUG, 3, "%s, ifindex %d, flags is running", ifname, ifinfo->ifi_index);
  64                 }
  65                 else {
  66                         dlog(LOG_DEBUG, 3, "%s, ifindex %d, flags is *NOT* running", ifname, ifinfo->ifi_index);
  67                 }
  68                 config_interface();
  69                 kickoff_adverts();
  70         }
  71 }
  72
  73 int netlink_socket(void)
  74 {
  75         int rc, sock;
  76         struct sockaddr_nl snl;
  77
  78         sock = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
  79         if (sock == -1) {
  80                 flog(LOG_ERR, "Unable to open netlink socket: %s", strerror(errno));
  81         }
  82
  83         memset(&snl, 0, sizeof(snl));
  84         snl.nl_family = AF_NETLINK;
  85         snl.nl_groups = RTMGRP_LINK;
  86
  87         rc = bind(sock, (struct sockaddr*)&snl, sizeof(snl));
  88         if (rc == -1) {
  89                 flog(LOG_ERR, "Unable to bind netlink socket: %s", strerror(errno));
  90                 close(sock);
  91                 sock = -1;
  92         }
  93
  94         return sock;
  95 }
  96