diff options
Diffstat (limited to 'package/ead/src/libbridge_init.c')
| -rw-r--r-- | package/ead/src/libbridge_init.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/package/ead/src/libbridge_init.c b/package/ead/src/libbridge_init.c new file mode 100644 index 000000000..36d0eb9b8 --- /dev/null +++ b/package/ead/src/libbridge_init.c @@ -0,0 +1,208 @@ +/* + * 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; + +static int br_init(void) +{ + if ((br_socket_fd = socket(AF_LOCAL, SOCK_STREAM, 0)) < 0) + return errno; + return 0; +} + +static 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. + */ +static 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). + */ +static 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; +} |