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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 <unistd.h>
#include <errno.h>
#include <string.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "libbridge.h"
#include "libbridge_private.h"
int br_socket_fd = -1;
int br_init(void)
{
if ((br_socket_fd = socket(AF_LOCAL, SOCK_STREAM, 0)) < 0)
return errno;
return 0;
}
void br_shutdown(void)
{
close(br_socket_fd);
br_socket_fd = -1;
}
/* If /sys/class/net/XXX/bridge exists then it must be a bridge */
static int isbridge(const struct dirent *entry)
{
char path[SYSFS_PATH_MAX];
struct stat st;
snprintf(path, SYSFS_PATH_MAX, SYSFS_CLASS_NET "%s/bridge", entry->d_name);
return stat(path, &st) == 0 && S_ISDIR(st.st_mode);
}
/*
* New interface uses sysfs to find bridges
*/
static int new_foreach_bridge(int (*iterator)(const char *name, void *),
void *arg)
{
struct dirent **namelist;
int i, count = 0;
count = scandir(SYSFS_CLASS_NET, &namelist, isbridge, alphasort);
if (count < 0)
return -1;
for (i = 0; i < count; i++) {
if (iterator(namelist[i]->d_name, arg))
break;
}
for (i = 0; i < count; i++)
free(namelist[i]);
free(namelist);
return count;
}
/*
* Old interface uses ioctl
*/
static int old_foreach_bridge(int (*iterator)(const char *, void *),
void *iarg)
{
int i, ret=0, num;
char ifname[IFNAMSIZ];
int ifindices[MAX_BRIDGES];
unsigned long args[3] = { BRCTL_GET_BRIDGES,
(unsigned long)ifindices, MAX_BRIDGES };
num = ioctl(br_socket_fd, SIOCGIFBR, args);
if (num < 0) {
dprintf("Get bridge indices failed: %s\n",
strerror(errno));
return -errno;
}
for (i = 0; i < num; i++) {
if (!if_indextoname(ifindices[i], ifname)) {
dprintf("get find name for ifindex %d\n",
ifindices[i]);
return -errno;
}
++ret;
if(iterator(ifname, iarg))
break;
}
return ret;
}
/*
* Go over all bridges and call iterator function.
* if iterator returns non-zero then stop.
*/
int br_foreach_bridge(int (*iterator)(const char *, void *),
void *arg)
{
int ret;
ret = new_foreach_bridge(iterator, arg);
if (ret <= 0)
ret = old_foreach_bridge(iterator, arg);
return ret;
}
/*
* Only used if sysfs is not available.
*/
static int old_foreach_port(const char *brname,
int (*iterator)(const char *br, const char *port,
void *arg),
void *arg)
{
int i, err, count;
struct ifreq ifr;
char ifname[IFNAMSIZ];
int ifindices[MAX_PORTS];
unsigned long args[4] = { BRCTL_GET_PORT_LIST,
(unsigned long)ifindices, MAX_PORTS, 0 };
memset(ifindices, 0, sizeof(ifindices));
strncpy(ifr.ifr_name, brname, IFNAMSIZ);
ifr.ifr_data = (char *) &args;
err = ioctl(br_socket_fd, SIOCDEVPRIVATE, &ifr);
if (err < 0) {
dprintf("list ports for bridge:'%s' failed: %s\n",
brname, strerror(errno));
return -errno;
}
count = 0;
for (i = 0; i < MAX_PORTS; i++) {
if (!ifindices[i])
continue;
if (!if_indextoname(ifindices[i], ifname)) {
dprintf("can't find name for ifindex:%d\n",
ifindices[i]);
continue;
}
++count;
if (iterator(brname, ifname, arg))
break;
}
return count;
}
/*
* Iterate over all ports in bridge (using sysfs).
*/
int br_foreach_port(const char *brname,
int (*iterator)(const char *br, const char *port, void *arg),
void *arg)
{
int i, count;
struct dirent **namelist;
char path[SYSFS_PATH_MAX];
snprintf(path, SYSFS_PATH_MAX, SYSFS_CLASS_NET "%s/brif", brname);
count = scandir(path, &namelist, 0, alphasort);
if (count < 0)
return old_foreach_port(brname, iterator, arg);
for (i = 0; i < count; i++) {
if (namelist[i]->d_name[0] == '.'
&& (namelist[i]->d_name[1] == '\0'
|| (namelist[i]->d_name[1] == '.'
&& namelist[i]->d_name[2] == '\0')))
continue;
if (iterator(brname, namelist[i]->d_name, arg))
break;
}
for (i = 0; i < count; i++)
free(namelist[i]);
free(namelist);
return count;
}
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