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/*
* brmon.c RTnetlink listener.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: Stephen Hemminger <shemminger@osdl.org>
*
* Modified by Srinivas Aji <Aji_Srinivas@emc.com> for use
* in RSTP daemon. - 2006-09-01
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <net/if.h>
#include <netinet/in.h>
#include <linux/if_bridge.h>
#include <string.h>
#include "libnetlink.h"
#include "bridge_ctl.h"
static const char SNAPSHOT[] = "v0.1";
static int dump_msg(const struct sockaddr_nl *who, struct nlmsghdr *n,
void *arg)
{
FILE *fp = arg;
struct ifinfomsg *ifi = NLMSG_DATA(n);
struct rtattr * tb[IFLA_MAX+1];
int len = n->nlmsg_len;
int master = -1;
char b1[IFNAMSIZ];
if (n->nlmsg_type == NLMSG_DONE)
return 0;
len -= NLMSG_LENGTH(sizeof(*ifi));
if (len < 0)
return -1;
if (ifi->ifi_family != AF_BRIDGE && ifi->ifi_family != AF_UNSPEC)
return 0;
if (n->nlmsg_type != RTM_NEWLINK &&
n->nlmsg_type != RTM_DELLINK)
return 0;
parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
/* Check if we got this from bonding */
if (tb[IFLA_MASTER] && ifi->ifi_family != AF_BRIDGE)
return 0;
/* Check if hearing our own state changes */
if (n->nlmsg_type == RTM_NEWLINK && tb[IFLA_PROTINFO]) {
uint8_t state = *(uint8_t *)RTA_DATA(tb[IFLA_PROTINFO]);
if (state != BR_STATE_DISABLED)
return 0;
}
if (tb[IFLA_IFNAME] == NULL) {
fprintf(stderr, "BUG: nil ifname\n");
return -1;
}
if (n->nlmsg_type == RTM_DELLINK)
fprintf(fp, "Deleted ");
fprintf(fp, "%d: %s ", ifi->ifi_index,
(const char*)RTA_DATA(tb[IFLA_IFNAME]));
if (tb[IFLA_MASTER]) {
master = *(int*)RTA_DATA(tb[IFLA_MASTER]);
fprintf(fp, "master %s ", if_indextoname(master, b1));
}
fprintf(fp, "\n");
fflush(fp);
bridge_notify(master, ifi->ifi_index,
(n->nlmsg_type == RTM_NEWLINK),
ifi->ifi_flags);
return 0;
}
#if 0
static void usage(void)
{
fprintf(stderr, "Usage: brmon\n");
exit(-1);
}
static int matches(const char *cmd, const char *pattern)
{
int len = strlen(cmd);
if (len > strlen(pattern))
return -1;
return memcmp(pattern, cmd, len);
}
int
main(int argc, char **argv)
{
struct rtnl_handle rth;
unsigned groups = ~RTMGRP_TC;
int llink = 0;
int laddr = 0;
while (argc > 1) {
if (matches(argv[1], "-Version") == 0) {
printf("brmon %s\n", SNAPSHOT);
exit(0);
} else if (matches(argv[1], "link") == 0) {
llink=1;
groups = 0;
} else if (matches(argv[1], "bridge") == 0) {
laddr=1;
groups = 0;
} else if (strcmp(argv[1], "all") == 0) {
groups = ~RTMGRP_TC;
} else if (matches(argv[1], "help") == 0) {
usage();
} else {
fprintf(stderr, "Argument \"%s\" is unknown, try \"rtmon help\".\n", argv[1]);
exit(-1);
}
argc--; argv++;
}
if (llink)
groups |= RTMGRP_LINK;
if (rtnl_open(&rth, groups) < 0)
exit(1);
if (rtnl_wilddump_request(&rth, PF_BRIDGE, RTM_GETLINK) < 0) {
perror("Cannot send dump request");
exit(1);
}
if (rtnl_dump_filter(&rth, dump_msg, stdout, NULL, NULL) < 0) {
fprintf(stderr, "Dump terminated\n");
return 1;
}
if (rtnl_listen(&rth, dump_msg, stdout) < 0)
exit(2);
exit(0);
}
#endif
#include "bridge_ctl.h"
#include "epoll_loop.h"
struct rtnl_handle rth;
struct epoll_event_handler br_handler;
struct rtnl_handle rth_state;
void br_ev_handler(uint32_t events, struct epoll_event_handler *h)
{
if (rtnl_listen(&rth, dump_msg, stdout) < 0) {
fprintf(stderr, "Error on bridge monitoring socket\n");
exit(-1);
}
}
int init_bridge_ops(void)
{
if (rtnl_open(&rth, ~RTMGRP_TC) < 0) {
fprintf(stderr, "Couldn't open rtnl socket for monitoring\n");
return -1;
}
if (rtnl_open(&rth_state, 0) < 0) {
fprintf(stderr, "Couldn't open rtnl socket for setting state\n");
return -1;
}
if (rtnl_wilddump_request(&rth, PF_BRIDGE, RTM_GETLINK) < 0) {
fprintf(stderr, "Cannot send dump request: %m\n");
return -1;
}
if (rtnl_dump_filter(&rth, dump_msg, stdout, NULL, NULL) < 0) {
fprintf(stderr, "Dump terminated\n");
return -1;
}
if (fcntl(rth.fd, F_SETFL, O_NONBLOCK) < 0) {
fprintf(stderr, "Error setting O_NONBLOCK: %m\n");
return -1;
}
br_handler.fd = rth.fd;
br_handler.arg = NULL;
br_handler.handler = br_ev_handler;
if (add_epoll(&br_handler) < 0)
return -1;
return 0;
}
/* Send message. Response is through bridge_notify */
void bridge_get_configuration(void)
{
if (rtnl_wilddump_request(&rth, PF_BRIDGE, RTM_GETLINK) < 0) {
fprintf(stderr, "Cannot send dump request: %m\n");
}
}
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