/bridge-utils-1.5/libbridge/libbridge_devif.c
C | 449 lines | 338 code | 74 blank | 37 comment | 28 complexity | f54d5ae939850f44e7f88a44f6ecdf67 MD5 | raw file
Possible License(s): GPL-2.0
- /*
- * 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/fcntl.h>
- #include "libbridge.h"
- #include "libbridge_private.h"
- static FILE *fpopen(const char *dir, const char *name)
- {
- char path[SYSFS_PATH_MAX];
- snprintf(path, SYSFS_PATH_MAX, "%s/%s", dir, name);
- return fopen(path, "r");
- }
- static void fetch_id(const char *dev, const char *name, struct bridge_id *id)
- {
- FILE *f = fpopen(dev, name);
- if (!f)
- fprintf(stderr, "%s: %s\n", dev, strerror(errno));
- else {
- fscanf(f, "%2hhx%2hhx.%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx",
- &id->prio[0], &id->prio[1],
- &id->addr[0], &id->addr[1], &id->addr[2],
- &id->addr[3], &id->addr[4], &id->addr[5]);
- fclose(f);
- }
- }
- /* Fetch an integer attribute out of sysfs. */
- static int fetch_int(const char *dev, const char *name)
- {
- FILE *f = fpopen(dev, name);
- int value = -1;
- if (!f)
- return 0;
- fscanf(f, "%i", &value);
- fclose(f);
- return value;
- }
- /* Get a time value out of sysfs */
- static void fetch_tv(const char *dev, const char *name,
- struct timeval *tv)
- {
- __jiffies_to_tv(tv, fetch_int(dev, name));
- }
- /*
- * Convert device name to an index in the list of ports in bridge.
- *
- * Old API does bridge operations as if ports were an array
- * inside bridge structure.
- */
- static int get_portno(const char *brname, const char *ifname)
- {
- int i;
- int ifindex = if_nametoindex(ifname);
- int ifindices[MAX_PORTS];
- unsigned long args[4] = { BRCTL_GET_PORT_LIST,
- (unsigned long)ifindices, MAX_PORTS, 0 };
- struct ifreq ifr;
- if (ifindex <= 0)
- goto error;
- memset(ifindices, 0, sizeof(ifindices));
- strncpy(ifr.ifr_name, brname, IFNAMSIZ);
- ifr.ifr_data = (char *) &args;
- if (ioctl(br_socket_fd, SIOCDEVPRIVATE, &ifr) < 0) {
- dprintf("get_portno: get ports of %s failed: %s\n",
- brname, strerror(errno));
- goto error;
- }
- for (i = 0; i < MAX_PORTS; i++) {
- if (ifindices[i] == ifindex)
- return i;
- }
- dprintf("%s is not a in bridge %s\n", ifname, brname);
- error:
- return -1;
- }
- /* get information via ioctl */
- static int old_get_bridge_info(const char *bridge, struct bridge_info *info)
- {
- struct ifreq ifr;
- struct __bridge_info i;
- unsigned long args[4] = { BRCTL_GET_BRIDGE_INFO,
- (unsigned long) &i, 0, 0 };
- memset(info, 0, sizeof(*info));
- strncpy(ifr.ifr_name, bridge, IFNAMSIZ);
- ifr.ifr_data = (char *) &args;
- if (ioctl(br_socket_fd, SIOCDEVPRIVATE, &ifr) < 0) {
- dprintf("%s: can't get info %s\n",
- bridge, strerror(errno));
- return errno;
- }
- 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->root_port = i.root_port;
- info->topology_change = i.topology_change;
- info->topology_change_detected = i.topology_change_detected;
- 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->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);
- return 0;
- }
- /*
- * Get bridge parameters using either sysfs or old
- * ioctl.
- */
- int br_get_bridge_info(const char *bridge, struct bridge_info *info)
- {
- DIR *dir;
- char path[SYSFS_PATH_MAX];
- snprintf(path, SYSFS_PATH_MAX, SYSFS_CLASS_NET "%s/bridge", bridge);
- dir = opendir(path);
- if (dir == NULL) {
- dprintf("path '%s' is not a directory\n", path);
- goto fallback;
- }
- memset(info, 0, sizeof(*info));
- fetch_id(path, "root_id", &info->designated_root);
- fetch_id(path, "bridge_id", &info->bridge_id);
- info->root_path_cost = fetch_int(path, "root_path_cost");
- fetch_tv(path, "max_age", &info->max_age);
- fetch_tv(path, "hello_time", &info->hello_time);
- fetch_tv(path, "forward_delay", &info->forward_delay);
- fetch_tv(path, "max_age", &info->bridge_max_age);
- fetch_tv(path, "hello_time", &info->bridge_hello_time);
- fetch_tv(path, "forward_delay", &info->bridge_forward_delay);
- fetch_tv(path, "ageing_time", &info->ageing_time);
- fetch_tv(path, "hello_timer", &info->hello_timer_value);
- fetch_tv(path, "tcn_timer", &info->tcn_timer_value);
- fetch_tv(path, "topology_change_timer",
- &info->topology_change_timer_value);;
- fetch_tv(path, "gc_timer", &info->gc_timer_value);
- info->root_port = fetch_int(path, "root_port");
- info->stp_enabled = fetch_int(path, "stp_state");
- info->topology_change = fetch_int(path, "topology_change");
- info->topology_change_detected = fetch_int(path, "topology_change_detected");
- closedir(dir);
- return 0;
- fallback:
- return old_get_bridge_info(bridge, info);
- }
- static int old_get_port_info(const char *brname, const char *port,
- struct port_info *info)
- {
- struct __port_info i;
- int index;
- memset(info, 0, sizeof(*info));
- index = get_portno(brname, port);
- if (index < 0)
- return errno;
-
- else {
- struct ifreq ifr;
- unsigned long args[4] = { BRCTL_GET_PORT_INFO,
- (unsigned long) &i, index, 0 };
-
- strncpy(ifr.ifr_name, brname, IFNAMSIZ);
- ifr.ifr_data = (char *) &args;
-
- if (ioctl(br_socket_fd, SIOCDEVPRIVATE, &ifr) < 0) {
- dprintf("old can't get port %s(%d) info %s\n",
- brname, index, strerror(errno));
- return errno;
- }
- }
- info->port_no = index;
- 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);
- info->hairpin_mode = 0;
- return 0;
- }
- /*
- * Get information about port on bridge.
- */
- int br_get_port_info(const char *brname, const char *port,
- struct port_info *info)
- {
- DIR *d;
- char path[SYSFS_PATH_MAX];
- snprintf(path, SYSFS_PATH_MAX, SYSFS_CLASS_NET "%s/brport", port);
- d = opendir(path);
- if (!d)
- goto fallback;
- memset(info, 0, sizeof(*info));
- fetch_id(path, "designated_root", &info->designated_root);
- fetch_id(path, "designated_bridge", &info->designated_bridge);
- info->port_no = fetch_int(path, "port_no");
- info->port_id = fetch_int(path, "port_id");
- info->designated_port = fetch_int(path, "designated_port");
- info->path_cost = fetch_int(path, "path_cost");
- info->designated_cost = fetch_int(path, "designated_cost");
- info->state = fetch_int(path, "state");
- info->top_change_ack = fetch_int(path, "change_ack");
- info->config_pending = fetch_int(path, "config_pending");
- fetch_tv(path, "message_age_timer", &info->message_age_timer_value);
- fetch_tv(path, "forward_delay_timer", &info->forward_delay_timer_value);
- fetch_tv(path, "hold_timer", &info->hold_timer_value);
- info->hairpin_mode = fetch_int(path, "hairpin_mode");
- closedir(d);
- return 0;
- fallback:
- return old_get_port_info(brname, port, info);
- }
- static int set_sysfs(const char *path, unsigned long value)
- {
- int fd, ret = 0, cc;
- char buf[32];
- fd = open(path, O_WRONLY);
- if (fd < 0)
- return -1;
- cc = snprintf(buf, sizeof(buf), "%lu\n", value);
- if (write(fd, buf, cc) < 0)
- ret = -1;
- close(fd);
- return ret;
- }
- static int br_set(const char *bridge, const char *name,
- unsigned long value, unsigned long oldcode)
- {
- int ret;
- char path[SYSFS_PATH_MAX];
- snprintf(path, SYSFS_PATH_MAX, SYSFS_CLASS_NET "%s/bridge/%s",
- bridge, name);
- if ((ret = set_sysfs(path, value)) < 0) {
- /* fallback to old ioctl */
- struct ifreq ifr;
- unsigned long args[4] = { oldcode, value, 0, 0 };
- strncpy(ifr.ifr_name, bridge, IFNAMSIZ);
- ifr.ifr_data = (char *) &args;
- ret = ioctl(br_socket_fd, SIOCDEVPRIVATE, &ifr);
- }
- return ret < 0 ? errno : 0;
- }
- int br_set_bridge_forward_delay(const char *br, struct timeval *tv)
- {
- return br_set(br, "forward_delay", __tv_to_jiffies(tv),
- BRCTL_SET_BRIDGE_FORWARD_DELAY);
- }
- int br_set_bridge_hello_time(const char *br, struct timeval *tv)
- {
- return br_set(br, "hello_time", __tv_to_jiffies(tv),
- BRCTL_SET_BRIDGE_HELLO_TIME);
- }
- int br_set_bridge_max_age(const char *br, struct timeval *tv)
- {
- return br_set(br, "max_age", __tv_to_jiffies(tv),
- BRCTL_SET_BRIDGE_MAX_AGE);
- }
- int br_set_ageing_time(const char *br, struct timeval *tv)
- {
- return br_set(br, "ageing_time", __tv_to_jiffies(tv),
- BRCTL_SET_AGEING_TIME);
- }
- int br_set_stp_state(const char *br, int stp_state)
- {
- return br_set(br, "stp_state", stp_state, BRCTL_SET_BRIDGE_STP_STATE);
- }
- int br_set_bridge_priority(const char *br, int bridge_priority)
- {
- return br_set(br, "priority", bridge_priority,
- BRCTL_SET_BRIDGE_PRIORITY);
- }
- static int port_set(const char *bridge, const char *ifname,
- const char *name, unsigned long value,
- unsigned long oldcode)
- {
- int ret;
- char path[SYSFS_PATH_MAX];
- snprintf(path, SYSFS_PATH_MAX, SYSFS_CLASS_NET "%s/brport/%s", ifname, name);
- if ((ret = set_sysfs(path, value)) < 0) {
- int index = get_portno(bridge, ifname);
- if (index < 0)
- ret = index;
- else {
- struct ifreq ifr;
- unsigned long args[4] = { oldcode, index, value, 0 };
-
- strncpy(ifr.ifr_name, bridge, IFNAMSIZ);
- ifr.ifr_data = (char *) &args;
- ret = ioctl(br_socket_fd, SIOCDEVPRIVATE, &ifr);
- }
- }
- return ret < 0 ? errno : 0;
- }
- int br_set_port_priority(const char *bridge, const char *port, int priority)
- {
- return port_set(bridge, port, "priority", priority, BRCTL_SET_PORT_PRIORITY);
- }
- int br_set_path_cost(const char *bridge, const char *port, int cost)
- {
- return port_set(bridge, port, "path_cost", cost, BRCTL_SET_PATH_COST);
- }
- int br_set_hairpin_mode(const char *bridge, const char *port, int hairpin_mode)
- {
- return port_set(bridge, port, "hairpin_mode", hairpin_mode, 0);
- }
- static inline void __copy_fdb(struct fdb_entry *ent,
- const struct __fdb_entry *f)
- {
- memcpy(ent->mac_addr, f->mac_addr, 6);
- ent->port_no = f->port_no;
- ent->is_local = f->is_local;
- __jiffies_to_tv(&ent->ageing_timer_value, f->ageing_timer_value);
- }
- int br_read_fdb(const char *bridge, struct fdb_entry *fdbs,
- unsigned long offset, int num)
- {
- FILE *f;
- int i, n;
- struct __fdb_entry fe[num];
- char path[SYSFS_PATH_MAX];
-
- /* open /sys/class/net/brXXX/brforward */
- snprintf(path, SYSFS_PATH_MAX, SYSFS_CLASS_NET "%s/brforward", bridge);
- f = fopen(path, "r");
- if (f) {
- fseek(f, offset*sizeof(struct __fdb_entry), SEEK_SET);
- n = fread(fe, sizeof(struct __fdb_entry), num, f);
- fclose(f);
- } else {
- /* old kernel, use ioctl */
- unsigned long args[4] = { BRCTL_GET_FDB_ENTRIES,
- (unsigned long) fe,
- num, offset };
- struct ifreq ifr;
- int retries = 0;
- strncpy(ifr.ifr_name, bridge, IFNAMSIZ);
- ifr.ifr_data = (char *) args;
- retry:
- n = ioctl(br_socket_fd, SIOCDEVPRIVATE, &ifr);
- /* table can change during ioctl processing */
- if (n < 0 && errno == EAGAIN && ++retries < 10) {
- sleep(0);
- goto retry;
- }
- }
- for (i = 0; i < n; i++)
- __copy_fdb(fdbs+i, fe+i);
- return n;
- }