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\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 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 15:
  72                 return show_mark(fp, n);
  73
  74         default:
  75                 return 0;
  76         }
  77
  78
  79 }
  80
  81 int do_monitor(int argc, char **argv)
  82 {
  83         char *file = NULL;
  84         unsigned groups = ~RTMGRP_TC;
  85         int llink=0;
  86         int lneigh=0;
  87
  88         rtnl_close(&rth);
  89
  90         while (argc > 0) {
  91                 if (matches(*argv, "file") == 0) {
  92                         NEXT_ARG();
  93                         file = *argv;
  94                 } else if (matches(*argv, "link") == 0) {
  95                         llink=1;
  96                         groups = 0;
  97                 } else if (matches(*argv, "fdb") == 0) {
  98                         lneigh = 1;
  99                         groups = 0;
 100                 } else if (strcmp(*argv, "all") == 0) {
 101                         groups = ~RTMGRP_TC;
 102                         prefix_banner=1;
 103                 } else if (matches(*argv, "help") == 0) {
 104                         usage();
 105                 } else {
 106                         fprintf(stderr, "Argument \"%s\" is unknown, try \"bridge monitor help\".\n", *argv);
 107                         exit(-1);
 108                 }
 109                 argc--; argv++;
 110         }
 111
 112         if (llink)
 113                 groups |= nl_mgrp(RTNLGRP_LINK);
 114
 115         if (lneigh) {
 116                 groups |= nl_mgrp(RTNLGRP_NEIGH);
 117         }
 118
 119         if (file) {
 120                 FILE *fp;
 121                 fp = fopen(file, "r");
 122                 if (fp == NULL) {
 123                         perror("Cannot fopen");
 124                         exit(-1);
 125                 }
 126                 return rtnl_from_file(fp, accept_msg, stdout);
 127         }
 128
 129         if (rtnl_open(&rth, groups) < 0)
 130                 exit(1);
 131         ll_init_map(&rth);
 132
 133         if (rtnl_listen(&rth, accept_msg, stdout) < 0)
 134                 exit(2);
 135
 136         return 0;
 137 }
 138