brstate.c

   1 /*
   2  * brstate.c    RTnetlink port state change
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Stephen Hemminger <shemminger@osdl.org>
  10  *
  11  *              Modified by Srinivas Aji <Aji_Srinivas@emc.com> for use
  12  *              in RSTP daemon. - 2006-09-01
  13  */
  14
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <unistd.h>
  18 #include <syslog.h>
  19 #include <fcntl.h>
  20 #include <sys/socket.h>
  21 #include <sys/time.h>
  22 #include <net/if.h>
  23 #include <netinet/in.h>
  24 #include <linux/if_bridge.h>
  25 #include <string.h>
  26
  27 #include "libnetlink.h"
  28
  29 static int br_set_state(struct rtnl_handle *rth, unsigned ifindex, __u8 state)
  30 {
  31         struct {
  32                 struct nlmsghdr n;
  33                 struct ifinfomsg ifi;
  34                 char buf[256];
  35         } req;
  36
  37         memset(&req, 0, sizeof(req));
  38
  39         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
  40         req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_REPLACE;
  41         req.n.nlmsg_type = RTM_SETLINK;
  42         req.ifi.ifi_family = AF_BRIDGE;
  43         req.ifi.ifi_index = ifindex;
  44
  45         addattr32(&req.n, sizeof(req.buf), IFLA_PROTINFO, state);
  46
  47         return rtnl_talk(rth, &req.n, 0, 0, NULL, NULL, NULL);
  48 }
  49
  50 #include "bridge_ctl.h"
  51
  52 extern struct rtnl_handle rth_state;
  53
  54 int bridge_set_state(int ifindex, int brstate)
  55 {
  56         int err = br_set_state(&rth_state, ifindex, brstate);
  57         if (err < 0) {
  58                 fprintf(stderr,
  59                         "Couldn't set bridge state, ifindex %d, state %d\n",
  60                         ifindex, brstate);
  61                 return -1;
  62         }
  63         return 0;
  64 }