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 show_mark(FILE *fp, const struct nlmsghdr *n)
  39 {
  40         char *tstr;
  41         time_t secs = ((__u32*)NLMSG_DATA(n))[0];
  42         long usecs = ((__u32*)NLMSG_DATA(n))[1];
  43         tstr = asctime(localtime(&secs));
  44         tstr[strlen(tstr)-1] = 0;
  45         fprintf(fp, "Timestamp: %s %lu us\n", tstr, usecs);
  46         return 0;
  47 }
  48
  49 static int accept_msg(const struct sockaddr_nl *who,
  50                       struct nlmsghdr *n, void *arg)
  51 {
  52         FILE *fp = arg;
  53
  54         if (timestamp)
  55                 print_timestamp(fp);
  56
  57         switch (n->nlmsg_type) {
  58         case RTM_NEWLINK:
  59         case RTM_DELLINK:
  60                 if (prefix_banner)
  61                         fprintf(fp, "[LINK]");
  62
  63                 return print_linkinfo(who, n, arg);
  64
  65         case RTM_NEWNEIGH:
  66         case RTM_DELNEIGH:
  67                 if (prefix_banner)
  68                         fprintf(fp, "[NEIGH]");
  69                 return print_fdb(who, n, arg);
  70
  71         case RTM_NEWMDB:
  72         case RTM_DELMDB:
  73                 if (prefix_banner)
  74                         fprintf(fp, "[MDB]");
  75                 return print_mdb(who, n, arg);
  76
  77         case 15:
  78                 return show_mark(fp, n);
  79
  80         default:
  81                 return 0;
  82         }
  83
  84
  85 }
  86
  87 int do_monitor(int argc, char **argv)
  88 {
  89         char *file = NULL;
  90         unsigned groups = ~RTMGRP_TC;
  91         int llink=0;
  92         int lneigh=0;
  93         int lmdb=0;
  94
  95         rtnl_close(&rth);
  96
  97         while (argc > 0) {
  98                 if (matches(*argv, "file") == 0) {
  99                         NEXT_ARG();
 100                         file = *argv;
 101                 } else if (matches(*argv, "link") == 0) {
 102                         llink=1;
 103                         groups = 0;
 104                 } else if (matches(*argv, "fdb") == 0) {
 105                         lneigh = 1;
 106                         groups = 0;
 107                 } else if (matches(*argv, "mdb") == 0) {
 108                         lmdb = 1;
 109                         groups = 0;
 110                 } else if (strcmp(*argv, "all") == 0) {
 111                         groups = ~RTMGRP_TC;
 112                         prefix_banner=1;
 113                 } else if (matches(*argv, "help") == 0) {
 114                         usage();
 115                 } else {
 116                         fprintf(stderr, "Argument \"%s\" is unknown, try \"bridge monitor help\".\n", *argv);
 117                         exit(-1);
 118                 }
 119                 argc--; argv++;
 120         }
 121
 122         if (llink)
 123                 groups |= nl_mgrp(RTNLGRP_LINK);
 124
 125         if (lneigh) {
 126                 groups |= nl_mgrp(RTNLGRP_NEIGH);
 127         }
 128
 129         if (lmdb) {
 130                 groups |= nl_mgrp(RTNLGRP_MDB);
 131         }
 132
 133         if (file) {
 134                 FILE *fp;
 135                 fp = fopen(file, "r");
 136                 if (fp == NULL) {
 137                         perror("Cannot fopen");
 138                         exit(-1);
 139                 }
 140                 return rtnl_from_file(fp, accept_msg, stdout);
 141         }
 142
 143         if (rtnl_open(&rth, groups) < 0)
 144                 exit(1);
 145         ll_init_map(&rth);
 146
 147         if (rtnl_listen(&rth, accept_msg, stdout) < 0)
 148                 exit(2);
 149
 150         return 0;
 151 }
 152