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/*
* Copyright (C) 2000 Lennert Buytenhek
*
* 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.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include "libbridge.h"
#include "libbridge_private.h"
#define MAX_BRIDGES 1024 /* arbitrary */
#define MAX_PORTS 256 /* STP limitation */
int br_socket_fd;
struct bridge *bridge_list;
static void __bridge_info_copy(struct bridge_info *info,
const struct __bridge_info *i)
{
memcpy(&info->designated_root, &i->designated_root, 8);
memcpy(&info->bridge_id, &i->bridge_id, 8);
info->root_path_cost = i->root_path_cost;
info->topology_change = i->topology_change;
info->topology_change_detected = i->topology_change_detected;
info->root_port = i->root_port;
info->stp_enabled = i->stp_enabled;
__jiffies_to_tv(&info->max_age, i->max_age);
__jiffies_to_tv(&info->hello_time, i->hello_time);
__jiffies_to_tv(&info->forward_delay, i->forward_delay);
__jiffies_to_tv(&info->bridge_max_age, i->bridge_max_age);
__jiffies_to_tv(&info->bridge_hello_time, i->bridge_hello_time);
__jiffies_to_tv(&info->bridge_forward_delay, i->bridge_forward_delay);
__jiffies_to_tv(&info->ageing_time, i->ageing_time);
__jiffies_to_tv(&info->gc_interval, i->gc_interval);
__jiffies_to_tv(&info->hello_timer_value, i->hello_timer_value);
__jiffies_to_tv(&info->tcn_timer_value, i->tcn_timer_value);
__jiffies_to_tv(&info->topology_change_timer_value,
i->topology_change_timer_value);
__jiffies_to_tv(&info->gc_timer_value, i->gc_timer_value);
}
static void __port_info_copy(struct port_info *info,
const struct __port_info *i)
{
memcpy(&info->designated_root, &i->designated_root, 8);
memcpy(&info->designated_bridge, &i->designated_bridge, 8);
info->port_id = i->port_id;
info->designated_port = i->designated_port;
info->path_cost = i->path_cost;
info->designated_cost = i->designated_cost;
info->state = i->state;
info->top_change_ack = i->top_change_ack;
info->config_pending = i->config_pending;
__jiffies_to_tv(&info->message_age_timer_value,
i->message_age_timer_value);
__jiffies_to_tv(&info->forward_delay_timer_value,
i->forward_delay_timer_value);
__jiffies_to_tv(&info->hold_timer_value,
i->hold_timer_value);
}
static int br_read_info(struct bridge *br)
{
struct __bridge_info i;
if (if_indextoname(br->ifindex, br->ifname) == NULL) {
/* index was there, but now it is gone! */
return -1;
}
if (br_device_ioctl(br, BRCTL_GET_BRIDGE_INFO,
(unsigned long)&i, 0, 0) < 0) {
fprintf(stderr, "%s: can't get info %s\n",
br->ifname, strerror(errno));
return errno;
}
__bridge_info_copy(&br->info, &i);
return 0;
}
static int br_read_port_info(struct port *p)
{
struct __port_info i;
if (br_device_ioctl(p->parent, BRCTL_GET_PORT_INFO,
(unsigned long)&i, p->index, 0) < 0) {
fprintf(stderr, "%s: can't get port %d info %s\n",
p->parent->ifname, p->index, strerror(errno));
return errno;
}
__port_info_copy(&p->info, &i);
return 0;
}
static void br_nuke_bridge(struct bridge *b)
{
struct port *p, *n;
for (p = b->firstport; p; p = n) {
n = p->next;
free(p);
}
free(b);
}
static int br_make_port_list(struct bridge *br)
{
int err;
int i;
int ifindices[MAX_PORTS];
struct port *p, **top;
memset(ifindices, 0, sizeof(ifindices));
if (br_device_ioctl(br, BRCTL_GET_PORT_LIST, (unsigned long)ifindices,
MAX_PORTS, 0) < 0)
return errno;
top = &br->firstport;
for (i = 0; i < MAX_PORTS; i++) {
if (!ifindices[i])
continue;
p = malloc(sizeof(struct port));
if (!p) {
err = -ENOMEM;
goto error_out;
}
p->next = NULL;
p->ifindex = ifindices[i];
p->parent = br;
p->index = i;
*top = p;
top = &p->next;
if ((err = br_read_port_info(p)) != 0)
goto error_out;
}
return 0;
error_out:
p = br->firstport;
while (p) {
struct port *n = p->next;
free(p);
p = n;
}
br->firstport = NULL;
return err;
}
static int br_make_bridge_list(void)
{
int i, num;
int ifindices[MAX_BRIDGES];
num = br_get_br(BRCTL_GET_BRIDGES, (unsigned long)ifindices,
MAX_BRIDGES);
if (num < 0) {
fprintf(stderr, "Get bridge indices failed: %s\n",
strerror(errno));
return errno;
}
bridge_list = NULL;
for (i = 0;i < num; i++) {
struct bridge *br;
br = malloc(sizeof(struct bridge));
if (!br)
return -ENOMEM;
memset(br, 0, sizeof(struct bridge));
br->ifindex = ifindices[i];
br->firstport = NULL;
if ( br_read_info(br) || br_make_port_list(br)) {
/* ignore the problem could just be a race! */
free(br);
continue;
}
br->next = bridge_list;
bridge_list = br;
}
return 0;
}
int br_init()
{
int err;
if ((br_socket_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
return errno;
if (br_get_version() != BRCTL_VERSION) {
fprintf(stderr, "bridge utilities not compatiable with kernel version\n");
exit(1);
}
if ((err = br_make_bridge_list()) != 0)
return err;
return 0;
}
int br_refresh()
{
struct bridge *b;
b = bridge_list;
while (b != NULL) {
struct bridge *bnext;
bnext = b->next;
br_nuke_bridge(b);
b = bnext;
}
return br_make_bridge_list();
}
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