br_ioctl.c 9.0 KB

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  1. /*
  2. * Ioctl handler
  3. * Linux ethernet bridge
  4. *
  5. * Authors:
  6. * Lennert Buytenhek <buytenh@gnu.org>
  7. *
  8. * $Id: br_ioctl.c,v 1.1.1.1 2007/06/12 07:27:14 eyryu Exp $
  9. *
  10. * This program is free software; you can redistribute it and/or
  11. * modify it under the terms of the GNU General Public License
  12. * as published by the Free Software Foundation; either version
  13. * 2 of the License, or (at your option) any later version.
  14. */
  15. #include <linux/capability.h>
  16. #include <linux/kernel.h>
  17. #include <linux/if_bridge.h>
  18. #include <linux/netdevice.h>
  19. #include <linux/times.h>
  20. #include <asm/uaccess.h>
  21. #include "br_private.h"
  22. /* called with RTNL */
  23. static int get_bridge_ifindices(int *indices, int num)
  24. {
  25. struct net_device *dev;
  26. int i = 0;
  27. for (dev = dev_base; dev && i < num; dev = dev->next) {
  28. if (dev->priv_flags & IFF_EBRIDGE)
  29. indices[i++] = dev->ifindex;
  30. }
  31. return i;
  32. }
  33. /* called with RTNL */
  34. static void get_port_ifindices(struct net_bridge *br, int *ifindices, int num)
  35. {
  36. struct net_bridge_port *p;
  37. list_for_each_entry(p, &br->port_list, list) {
  38. if (p->port_no < num)
  39. ifindices[p->port_no] = p->dev->ifindex;
  40. }
  41. }
  42. /*
  43. * Format up to a page worth of forwarding table entries
  44. * userbuf -- where to copy result
  45. * maxnum -- maximum number of entries desired
  46. * (limited to a page for sanity)
  47. * offset -- number of records to skip
  48. */
  49. static int get_fdb_entries(struct net_bridge *br, void __user *userbuf,
  50. unsigned long maxnum, unsigned long offset)
  51. {
  52. int num;
  53. void *buf;
  54. size_t size;
  55. /* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */
  56. if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry))
  57. maxnum = PAGE_SIZE/sizeof(struct __fdb_entry);
  58. size = maxnum * sizeof(struct __fdb_entry);
  59. buf = kmalloc(size, GFP_USER);
  60. if (!buf)
  61. return -ENOMEM;
  62. num = br_fdb_fillbuf(br, buf, maxnum, offset);
  63. if (num > 0) {
  64. if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry)))
  65. num = -EFAULT;
  66. }
  67. kfree(buf);
  68. return num;
  69. }
  70. static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
  71. {
  72. struct net_device *dev;
  73. int ret;
  74. if (!capable(CAP_NET_ADMIN))
  75. return -EPERM;
  76. dev = dev_get_by_index(ifindex);
  77. if (dev == NULL)
  78. return -EINVAL;
  79. if (isadd)
  80. ret = br_add_if(br, dev);
  81. else
  82. ret = br_del_if(br, dev);
  83. dev_put(dev);
  84. return ret;
  85. }
  86. /*
  87. * Legacy ioctl's through SIOCDEVPRIVATE
  88. * This interface is deprecated because it was too difficult to
  89. * to do the translation for 32/64bit ioctl compatability.
  90. */
  91. static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
  92. {
  93. struct net_bridge *br = netdev_priv(dev);
  94. unsigned long args[4];
  95. if (copy_from_user(args, rq->ifr_data, sizeof(args)))
  96. return -EFAULT;
  97. switch (args[0]) {
  98. case BRCTL_ADD_IF:
  99. case BRCTL_DEL_IF:
  100. return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF);
  101. case BRCTL_GET_BRIDGE_INFO:
  102. {
  103. struct __bridge_info b;
  104. memset(&b, 0, sizeof(struct __bridge_info));
  105. rcu_read_lock();
  106. memcpy(&b.designated_root, &br->designated_root, 8);
  107. memcpy(&b.bridge_id, &br->bridge_id, 8);
  108. b.root_path_cost = br->root_path_cost;
  109. b.max_age = jiffies_to_clock_t(br->max_age);
  110. b.hello_time = jiffies_to_clock_t(br->hello_time);
  111. b.forward_delay = br->forward_delay;
  112. b.bridge_max_age = br->bridge_max_age;
  113. b.bridge_hello_time = br->bridge_hello_time;
  114. b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay);
  115. b.topology_change = br->topology_change;
  116. b.topology_change_detected = br->topology_change_detected;
  117. b.root_port = br->root_port;
  118. b.stp_enabled = br->stp_enabled;
  119. b.ageing_time = jiffies_to_clock_t(br->ageing_time);
  120. b.hello_timer_value = br_timer_value(&br->hello_timer);
  121. b.tcn_timer_value = br_timer_value(&br->tcn_timer);
  122. b.topology_change_timer_value = br_timer_value(&br->topology_change_timer);
  123. b.gc_timer_value = br_timer_value(&br->gc_timer);
  124. rcu_read_unlock();
  125. if (copy_to_user((void __user *)args[1], &b, sizeof(b)))
  126. return -EFAULT;
  127. return 0;
  128. }
  129. case BRCTL_GET_PORT_LIST:
  130. {
  131. int num, *indices;
  132. num = args[2];
  133. if (num < 0)
  134. return -EINVAL;
  135. if (num == 0)
  136. num = 256;
  137. if (num > BR_MAX_PORTS)
  138. num = BR_MAX_PORTS;
  139. indices = kcalloc(num, sizeof(int), GFP_KERNEL);
  140. if (indices == NULL)
  141. return -ENOMEM;
  142. get_port_ifindices(br, indices, num);
  143. if (copy_to_user((void __user *)args[1], indices, num*sizeof(int)))
  144. num = -EFAULT;
  145. kfree(indices);
  146. return num;
  147. }
  148. case BRCTL_SET_BRIDGE_FORWARD_DELAY:
  149. if (!capable(CAP_NET_ADMIN))
  150. return -EPERM;
  151. spin_lock_bh(&br->lock);
  152. br->bridge_forward_delay = clock_t_to_jiffies(args[1]);
  153. if (br_is_root_bridge(br))
  154. br->forward_delay = br->bridge_forward_delay;
  155. spin_unlock_bh(&br->lock);
  156. return 0;
  157. case BRCTL_SET_BRIDGE_HELLO_TIME:
  158. if (!capable(CAP_NET_ADMIN))
  159. return -EPERM;
  160. spin_lock_bh(&br->lock);
  161. br->bridge_hello_time = clock_t_to_jiffies(args[1]);
  162. if (br_is_root_bridge(br))
  163. br->hello_time = br->bridge_hello_time;
  164. spin_unlock_bh(&br->lock);
  165. return 0;
  166. case BRCTL_SET_BRIDGE_MAX_AGE:
  167. if (!capable(CAP_NET_ADMIN))
  168. return -EPERM;
  169. spin_lock_bh(&br->lock);
  170. br->bridge_max_age = clock_t_to_jiffies(args[1]);
  171. if (br_is_root_bridge(br))
  172. br->max_age = br->bridge_max_age;
  173. spin_unlock_bh(&br->lock);
  174. return 0;
  175. case BRCTL_SET_AGEING_TIME:
  176. if (!capable(CAP_NET_ADMIN))
  177. return -EPERM;
  178. br->ageing_time = clock_t_to_jiffies(args[1]);
  179. return 0;
  180. case BRCTL_GET_PORT_INFO:
  181. {
  182. struct __port_info p;
  183. struct net_bridge_port *pt;
  184. rcu_read_lock();
  185. if ((pt = br_get_port(br, args[2])) == NULL) {
  186. rcu_read_unlock();
  187. return -EINVAL;
  188. }
  189. memset(&p, 0, sizeof(struct __port_info));
  190. memcpy(&p.designated_root, &pt->designated_root, 8);
  191. memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
  192. p.port_id = pt->port_id;
  193. p.designated_port = pt->designated_port;
  194. p.path_cost = pt->path_cost;
  195. p.designated_cost = pt->designated_cost;
  196. p.state = pt->state;
  197. p.top_change_ack = pt->topology_change_ack;
  198. p.config_pending = pt->config_pending;
  199. p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
  200. p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
  201. p.hold_timer_value = br_timer_value(&pt->hold_timer);
  202. rcu_read_unlock();
  203. if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
  204. return -EFAULT;
  205. return 0;
  206. }
  207. case BRCTL_SET_BRIDGE_STP_STATE:
  208. if (!capable(CAP_NET_ADMIN))
  209. return -EPERM;
  210. br->stp_enabled = args[1]?1:0;
  211. return 0;
  212. case BRCTL_SET_BRIDGE_PRIORITY:
  213. if (!capable(CAP_NET_ADMIN))
  214. return -EPERM;
  215. spin_lock_bh(&br->lock);
  216. br_stp_set_bridge_priority(br, args[1]);
  217. spin_unlock_bh(&br->lock);
  218. return 0;
  219. case BRCTL_SET_PORT_PRIORITY:
  220. {
  221. struct net_bridge_port *p;
  222. int ret = 0;
  223. if (!capable(CAP_NET_ADMIN))
  224. return -EPERM;
  225. if (args[2] >= (1<<(16-BR_PORT_BITS)))
  226. return -ERANGE;
  227. spin_lock_bh(&br->lock);
  228. if ((p = br_get_port(br, args[1])) == NULL)
  229. ret = -EINVAL;
  230. else
  231. br_stp_set_port_priority(p, args[2]);
  232. spin_unlock_bh(&br->lock);
  233. return ret;
  234. }
  235. case BRCTL_SET_PATH_COST:
  236. {
  237. struct net_bridge_port *p;
  238. int ret = 0;
  239. if (!capable(CAP_NET_ADMIN))
  240. return -EPERM;
  241. if ((p = br_get_port(br, args[1])) == NULL)
  242. ret = -EINVAL;
  243. else
  244. br_stp_set_path_cost(p, args[2]);
  245. return ret;
  246. }
  247. case BRCTL_GET_FDB_ENTRIES:
  248. return get_fdb_entries(br, (void __user *)args[1],
  249. args[2], args[3]);
  250. }
  251. return -EOPNOTSUPP;
  252. }
  253. static int old_deviceless(void __user *uarg)
  254. {
  255. unsigned long args[3];
  256. if (copy_from_user(args, uarg, sizeof(args)))
  257. return -EFAULT;
  258. switch (args[0]) {
  259. case BRCTL_GET_VERSION:
  260. return BRCTL_VERSION;
  261. case BRCTL_GET_BRIDGES:
  262. {
  263. int *indices;
  264. int ret = 0;
  265. if (args[2] >= 2048)
  266. return -ENOMEM;
  267. indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
  268. if (indices == NULL)
  269. return -ENOMEM;
  270. args[2] = get_bridge_ifindices(indices, args[2]);
  271. ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
  272. ? -EFAULT : args[2];
  273. kfree(indices);
  274. return ret;
  275. }
  276. case BRCTL_ADD_BRIDGE:
  277. case BRCTL_DEL_BRIDGE:
  278. {
  279. char buf[IFNAMSIZ];
  280. if (!capable(CAP_NET_ADMIN))
  281. return -EPERM;
  282. if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
  283. return -EFAULT;
  284. buf[IFNAMSIZ-1] = 0;
  285. if (args[0] == BRCTL_ADD_BRIDGE)
  286. return br_add_bridge(buf);
  287. return br_del_bridge(buf);
  288. }
  289. }
  290. return -EOPNOTSUPP;
  291. }
  292. int br_ioctl_deviceless_stub(unsigned int cmd, void __user *uarg)
  293. {
  294. switch (cmd) {
  295. case SIOCGIFBR:
  296. case SIOCSIFBR:
  297. return old_deviceless(uarg);
  298. case SIOCBRADDBR:
  299. case SIOCBRDELBR:
  300. {
  301. char buf[IFNAMSIZ];
  302. if (!capable(CAP_NET_ADMIN))
  303. return -EPERM;
  304. if (copy_from_user(buf, uarg, IFNAMSIZ))
  305. return -EFAULT;
  306. buf[IFNAMSIZ-1] = 0;
  307. if (cmd == SIOCBRADDBR)
  308. return br_add_bridge(buf);
  309. return br_del_bridge(buf);
  310. }
  311. }
  312. return -EOPNOTSUPP;
  313. }
  314. int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
  315. {
  316. struct net_bridge *br = netdev_priv(dev);
  317. switch(cmd) {
  318. case SIOCDEVPRIVATE:
  319. return old_dev_ioctl(dev, rq, cmd);
  320. case SIOCBRADDIF:
  321. case SIOCBRDELIF:
  322. return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
  323. }
  324. pr_debug("Bridge does not support ioctl 0x%x\n", cmd);
  325. return -EOPNOTSUPP;
  326. }