bridge/monitor.c

   1 /*
   2  * brmonitor.c          "bridge monitor"
   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@vyatta.com>
  10  *
  11  */
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <time.h>
  17 #include <sys/socket.h>
  18 #include <sys/time.h>
  19 #include <net/if.h>
  20 #include <netinet/in.h>
  21 #include <linux/if_bridge.h>
  22 #include <linux/neighbour.h>
  23 #include <string.h>
  24
  25 #include "utils.h"
  26 #include "br_common.h"
  27
  28
  29 static void usage(void) __attribute__((noreturn));
  30 int prefix_banner;
  31
  32 static void usage(void)
  33 {
  34         fprintf(stderr, "Usage: bridge monitor [file | link | fdb | mdb | all]\n");
  35         exit(-1);
  36 }
  37
  38 static int accept_msg(const struct sockaddr_nl *who,
  39                       struct rtnl_ctrl_data *ctrl,
  40                       struct nlmsghdr *n, void *arg)
  41 {
  42         FILE *fp = arg;
  43
  44         if (timestamp)
  45                 print_timestamp(fp);
  46
  47         switch (n->nlmsg_type) {
  48         case RTM_NEWLINK:
  49         case RTM_DELLINK:
  50                 if (prefix_banner)
  51                         fprintf(fp, "[LINK]");
  52
  53                 return print_linkinfo(who, n, arg);
  54
  55         case RTM_NEWNEIGH:
  56         case RTM_DELNEIGH:
  57                 if (prefix_banner)
  58                         fprintf(fp, "[NEIGH]");
  59                 return print_fdb(who, n, arg);
  60
  61         case RTM_NEWMDB:
  62         case RTM_DELMDB:
  63                 if (prefix_banner)
  64                         fprintf(fp, "[MDB]");
  65                 return print_mdb(who, n, arg);
  66
  67         case NLMSG_TSTAMP:
  68                 print_nlmsg_timestamp(fp, n);
  69                 return 0;
  70
  71         default:
  72                 return 0;
  73         }
  74 }
  75
  76 int do_monitor(int argc, char **argv)
  77 {
  78         char *file = NULL;
  79         unsigned int groups = ~RTMGRP_TC;
  80         int llink = 0;
  81         int lneigh = 0;
  82         int lmdb = 0;
  83
  84         rtnl_close(&rth);
  85
  86         while (argc > 0) {
  87                 if (matches(*argv, "file") == 0) {
  88                         NEXT_ARG();
  89                         file = *argv;
  90                 } else if (matches(*argv, "link") == 0) {
  91                         llink = 1;
  92                         groups = 0;
  93                 } else if (matches(*argv, "fdb") == 0) {
  94                         lneigh = 1;
  95                         groups = 0;
  96                 } else if (matches(*argv, "mdb") == 0) {
  97                         lmdb = 1;
  98                         groups = 0;
  99                 } else if (strcmp(*argv, "all") == 0) {
 100                         groups = ~RTMGRP_TC;
 101                         prefix_banner = 1;
 102                 } else if (matches(*argv, "help") == 0) {
 103                         usage();
 104                 } else {
 105                         fprintf(stderr, "Argument \"%s\" is unknown, try \"bridge monitor help\".\n", *argv);
 106                         exit(-1);
 107                 }
 108                 argc--; argv++;
 109         }
 110
 111         if (llink)
 112                 groups |= nl_mgrp(RTNLGRP_LINK);
 113
 114         if (lneigh) {
 115                 groups |= nl_mgrp(RTNLGRP_NEIGH);
 116         }
 117
 118         if (lmdb) {
 119                 groups |= nl_mgrp(RTNLGRP_MDB);
 120         }
 121
 122         if (file) {
 123                 FILE *fp;
 124                 int err;
 125
 126                 fp = fopen(file, "r");
 127                 if (fp == NULL) {
 128                         perror("Cannot fopen");
 129                         exit(-1);
 130                 }
 131                 err = rtnl_from_file(fp, accept_msg, stdout);
 132                 fclose(fp);
 133                 return err;
 134         }
 135
 136         if (rtnl_open(&rth, groups) < 0)
 137                 exit(1);
 138         ll_init_map(&rth);
 139
 140         if (rtnl_listen(&rth, accept_msg, stdout) < 0)
 141                 exit(2);
 142
 143         return 0;
 144 }