/* * 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 "libbridge.h"#include "libbridge_private.h"int br_socket_fd = -1;struct sysfs_class *br_class_net;int br_init(void){	if ((br_socket_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0)		return errno;	br_class_net = sysfs_open_class("net");	return 0;}int br_refresh(void){	if (br_class_net) {		sysfs_close_class(br_class_net);		br_class_net = sysfs_open_class("net");	}		return 0;}void br_shutdown(void){	sysfs_close_class(br_class_net);	br_class_net = NULL;	close(br_socket_fd);	br_socket_fd = -1;}#ifdef HAVE_LIBSYSFS/* If /sys/class/net/XXX/bridge exists then it must be a bridge */static int isbridge(const struct sysfs_class_device *dev) {	char path[SYSFS_PATH_MAX];	snprintf(path, sizeof(path), "%s/bridge", dev->path);	return !sysfs_path_is_dir(path);}/* * New interface uses sysfs to find bridges */static int new_foreach_bridge(int (*iterator)(const char *name, void *),			      void *arg){	struct sysfs_class_device *dev;	struct dlist *devlist;	int count = 0;	if (!br_class_net) {		dprintf("no class /sys/class/net\n");		return -EOPNOTSUPP;	}	devlist = sysfs_get_class_devices(br_class_net);	if (!devlist) {		dprintf("Can't read devices from sysfs\n");		return -errno;	}	dlist_for_each_data(devlist, dev, struct sysfs_class_device) {		if (isbridge(dev)) {			++count;			if (iterator(dev->name, arg))				break;		}	}	return count;}#endif/* * 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;#ifdef HAVE_LIBSYSFS	ret = new_foreach_bridge(iterator, arg);	if (ret <= 0)#endif		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){#ifdef HAVE_LIBSYSFS	struct sysfs_class_device *dev;	struct sysfs_directory *dir;	struct sysfs_link *plink;	struct dlist *links;	int err = 0;	char path[SYSFS_PATH_MAX];	if (!br_class_net ||	    !(dev = sysfs_get_class_device(br_class_net, (char *) brname)))		goto old;	snprintf(path, sizeof(path), "%s/%s", 		 dev->path, SYSFS_BRIDGE_PORT_SUBDIR);	dprintf("path=%s\n", path);	dir = sysfs_open_directory(path);	if (!dir) {		/* no /sys/class/net/ethX/brif subdirectory		 * either: old kernel, or not really a bridge		 */		goto old;	}	links = sysfs_get_dir_links(dir);	if (!links) {		err = -ENOSYS;		goto out;	}	err = 0;	dlist_for_each_data(links, plink, struct sysfs_link) {		++err;		if (iterator(brname, plink->name, arg))			break;	} out:	sysfs_close_directory(dir);	return err; old:#endif	return old_foreach_port(brname, iterator, arg);	}