Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Spanning tree protocol; generic parts |
| 3 | * Linux ethernet bridge |
| 4 | * |
| 5 | * Authors: |
| 6 | * Lennert Buytenhek <buytenh@gnu.org> |
| 7 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * as published by the Free Software Foundation; either version |
| 11 | * 2 of the License, or (at your option) any later version. |
| 12 | */ |
| 13 | #include <linux/kernel.h> |
Franck Bui-Huu | 8252474 | 2008-05-12 21:21:05 +0200 | [diff] [blame] | 14 | #include <linux/rculist.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | |
| 16 | #include "br_private.h" |
| 17 | #include "br_private_stp.h" |
| 18 | |
| 19 | /* since time values in bpdu are in jiffies and then scaled (1/256) |
Joakim Tjernlund | aaca735 | 2012-03-01 08:12:18 +0000 | [diff] [blame] | 20 | * before sending, make sure that is at least one STP tick. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | */ |
Joakim Tjernlund | aaca735 | 2012-03-01 08:12:18 +0000 | [diff] [blame] | 22 | #define MESSAGE_AGE_INCR ((HZ / 256) + 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
Jan Engelhardt | 36cbd3d | 2009-08-05 10:42:58 -0700 | [diff] [blame] | 24 | static const char *const br_port_state_names[] = { |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 25 | [BR_STATE_DISABLED] = "disabled", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | [BR_STATE_LISTENING] = "listening", |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 27 | [BR_STATE_LEARNING] = "learning", |
| 28 | [BR_STATE_FORWARDING] = "forwarding", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | [BR_STATE_BLOCKING] = "blocking", |
| 30 | }; |
| 31 | |
| 32 | void br_log_state(const struct net_bridge_port *p) |
| 33 | { |
stephen hemminger | 28a16c9 | 2010-05-10 09:31:09 +0000 | [diff] [blame] | 34 | br_info(p->br, "port %u(%s) entering %s state\n", |
| 35 | (unsigned) p->port_no, p->dev->name, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | br_port_state_names[p->state]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | } |
| 38 | |
| 39 | /* called under bridge lock */ |
| 40 | struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no) |
| 41 | { |
| 42 | struct net_bridge_port *p; |
| 43 | |
| 44 | list_for_each_entry_rcu(p, &br->port_list, list) { |
| 45 | if (p->port_no == port_no) |
| 46 | return p; |
| 47 | } |
| 48 | |
| 49 | return NULL; |
| 50 | } |
| 51 | |
| 52 | /* called under bridge lock */ |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 53 | static int br_should_become_root_port(const struct net_bridge_port *p, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | u16 root_port) |
| 55 | { |
| 56 | struct net_bridge *br; |
| 57 | struct net_bridge_port *rp; |
| 58 | int t; |
| 59 | |
| 60 | br = p->br; |
| 61 | if (p->state == BR_STATE_DISABLED || |
| 62 | br_is_designated_port(p)) |
| 63 | return 0; |
| 64 | |
| 65 | if (memcmp(&br->bridge_id, &p->designated_root, 8) <= 0) |
| 66 | return 0; |
| 67 | |
| 68 | if (!root_port) |
| 69 | return 1; |
| 70 | |
| 71 | rp = br_get_port(br, root_port); |
| 72 | |
| 73 | t = memcmp(&p->designated_root, &rp->designated_root, 8); |
| 74 | if (t < 0) |
| 75 | return 1; |
| 76 | else if (t > 0) |
| 77 | return 0; |
| 78 | |
| 79 | if (p->designated_cost + p->path_cost < |
| 80 | rp->designated_cost + rp->path_cost) |
| 81 | return 1; |
| 82 | else if (p->designated_cost + p->path_cost > |
| 83 | rp->designated_cost + rp->path_cost) |
| 84 | return 0; |
| 85 | |
| 86 | t = memcmp(&p->designated_bridge, &rp->designated_bridge, 8); |
| 87 | if (t < 0) |
| 88 | return 1; |
| 89 | else if (t > 0) |
| 90 | return 0; |
| 91 | |
| 92 | if (p->designated_port < rp->designated_port) |
| 93 | return 1; |
| 94 | else if (p->designated_port > rp->designated_port) |
| 95 | return 0; |
| 96 | |
| 97 | if (p->port_id < rp->port_id) |
| 98 | return 1; |
| 99 | |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | /* called under bridge lock */ |
| 104 | static void br_root_selection(struct net_bridge *br) |
| 105 | { |
| 106 | struct net_bridge_port *p; |
| 107 | u16 root_port = 0; |
| 108 | |
| 109 | list_for_each_entry(p, &br->port_list, list) { |
| 110 | if (br_should_become_root_port(p, root_port)) |
| 111 | root_port = p->port_no; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | } |
| 113 | |
| 114 | br->root_port = root_port; |
| 115 | |
| 116 | if (!root_port) { |
| 117 | br->designated_root = br->bridge_id; |
| 118 | br->root_path_cost = 0; |
| 119 | } else { |
| 120 | p = br_get_port(br, root_port); |
| 121 | br->designated_root = p->designated_root; |
| 122 | br->root_path_cost = p->designated_cost + p->path_cost; |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | /* called under bridge lock */ |
| 127 | void br_become_root_bridge(struct net_bridge *br) |
| 128 | { |
| 129 | br->max_age = br->bridge_max_age; |
| 130 | br->hello_time = br->bridge_hello_time; |
| 131 | br->forward_delay = br->bridge_forward_delay; |
| 132 | br_topology_change_detection(br); |
| 133 | del_timer(&br->tcn_timer); |
| 134 | |
| 135 | if (br->dev->flags & IFF_UP) { |
| 136 | br_config_bpdu_generation(br); |
| 137 | mod_timer(&br->hello_timer, jiffies + br->hello_time); |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | /* called under bridge lock */ |
| 142 | void br_transmit_config(struct net_bridge_port *p) |
| 143 | { |
| 144 | struct br_config_bpdu bpdu; |
| 145 | struct net_bridge *br; |
| 146 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | if (timer_pending(&p->hold_timer)) { |
| 148 | p->config_pending = 1; |
| 149 | return; |
| 150 | } |
| 151 | |
| 152 | br = p->br; |
| 153 | |
| 154 | bpdu.topology_change = br->topology_change; |
| 155 | bpdu.topology_change_ack = p->topology_change_ack; |
| 156 | bpdu.root = br->designated_root; |
| 157 | bpdu.root_path_cost = br->root_path_cost; |
| 158 | bpdu.bridge_id = br->bridge_id; |
| 159 | bpdu.port_id = p->port_id; |
| 160 | if (br_is_root_bridge(br)) |
| 161 | bpdu.message_age = 0; |
| 162 | else { |
| 163 | struct net_bridge_port *root |
| 164 | = br_get_port(br, br->root_port); |
stephen hemminger | 0c03150 | 2011-07-22 07:47:06 +0000 | [diff] [blame] | 165 | bpdu.message_age = (jiffies - root->designated_age) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | + MESSAGE_AGE_INCR; |
| 167 | } |
| 168 | bpdu.max_age = br->max_age; |
| 169 | bpdu.hello_time = br->hello_time; |
| 170 | bpdu.forward_delay = br->forward_delay; |
| 171 | |
| 172 | if (bpdu.message_age < br->max_age) { |
| 173 | br_send_config_bpdu(p, &bpdu); |
| 174 | p->topology_change_ack = 0; |
| 175 | p->config_pending = 0; |
Stephen Hemminger | 9a834b8 | 2007-05-31 01:21:39 -0700 | [diff] [blame] | 176 | mod_timer(&p->hold_timer, |
| 177 | round_jiffies(jiffies + BR_HOLD_TIME)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | } |
| 179 | } |
| 180 | |
| 181 | /* called under bridge lock */ |
stephen hemminger | 160d73b | 2011-07-22 07:47:10 +0000 | [diff] [blame] | 182 | static void br_record_config_information(struct net_bridge_port *p, |
| 183 | const struct br_config_bpdu *bpdu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | { |
| 185 | p->designated_root = bpdu->root; |
| 186 | p->designated_cost = bpdu->root_path_cost; |
| 187 | p->designated_bridge = bpdu->bridge_id; |
| 188 | p->designated_port = bpdu->port_id; |
Joakim Tjernlund | 709e1b5 | 2012-03-01 08:12:19 +0000 | [diff] [blame] | 189 | p->designated_age = jiffies - bpdu->message_age; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 191 | mod_timer(&p->message_age_timer, jiffies |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | + (p->br->max_age - bpdu->message_age)); |
| 193 | } |
| 194 | |
| 195 | /* called under bridge lock */ |
stephen hemminger | 160d73b | 2011-07-22 07:47:10 +0000 | [diff] [blame] | 196 | static void br_record_config_timeout_values(struct net_bridge *br, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | const struct br_config_bpdu *bpdu) |
| 198 | { |
| 199 | br->max_age = bpdu->max_age; |
| 200 | br->hello_time = bpdu->hello_time; |
| 201 | br->forward_delay = bpdu->forward_delay; |
| 202 | br->topology_change = bpdu->topology_change; |
| 203 | } |
| 204 | |
| 205 | /* called under bridge lock */ |
| 206 | void br_transmit_tcn(struct net_bridge *br) |
| 207 | { |
| 208 | br_send_tcn_bpdu(br_get_port(br, br->root_port)); |
| 209 | } |
| 210 | |
| 211 | /* called under bridge lock */ |
| 212 | static int br_should_become_designated_port(const struct net_bridge_port *p) |
| 213 | { |
| 214 | struct net_bridge *br; |
| 215 | int t; |
| 216 | |
| 217 | br = p->br; |
| 218 | if (br_is_designated_port(p)) |
| 219 | return 1; |
| 220 | |
| 221 | if (memcmp(&p->designated_root, &br->designated_root, 8)) |
| 222 | return 1; |
| 223 | |
| 224 | if (br->root_path_cost < p->designated_cost) |
| 225 | return 1; |
| 226 | else if (br->root_path_cost > p->designated_cost) |
| 227 | return 0; |
| 228 | |
| 229 | t = memcmp(&br->bridge_id, &p->designated_bridge, 8); |
| 230 | if (t < 0) |
| 231 | return 1; |
| 232 | else if (t > 0) |
| 233 | return 0; |
| 234 | |
| 235 | if (p->port_id < p->designated_port) |
| 236 | return 1; |
| 237 | |
| 238 | return 0; |
| 239 | } |
| 240 | |
| 241 | /* called under bridge lock */ |
| 242 | static void br_designated_port_selection(struct net_bridge *br) |
| 243 | { |
| 244 | struct net_bridge_port *p; |
| 245 | |
| 246 | list_for_each_entry(p, &br->port_list, list) { |
| 247 | if (p->state != BR_STATE_DISABLED && |
| 248 | br_should_become_designated_port(p)) |
| 249 | br_become_designated_port(p); |
| 250 | |
| 251 | } |
| 252 | } |
| 253 | |
| 254 | /* called under bridge lock */ |
stephen hemminger | 160d73b | 2011-07-22 07:47:10 +0000 | [diff] [blame] | 255 | static int br_supersedes_port_info(const struct net_bridge_port *p, |
| 256 | const struct br_config_bpdu *bpdu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | { |
| 258 | int t; |
| 259 | |
| 260 | t = memcmp(&bpdu->root, &p->designated_root, 8); |
| 261 | if (t < 0) |
| 262 | return 1; |
| 263 | else if (t > 0) |
| 264 | return 0; |
| 265 | |
| 266 | if (bpdu->root_path_cost < p->designated_cost) |
| 267 | return 1; |
| 268 | else if (bpdu->root_path_cost > p->designated_cost) |
| 269 | return 0; |
| 270 | |
| 271 | t = memcmp(&bpdu->bridge_id, &p->designated_bridge, 8); |
| 272 | if (t < 0) |
| 273 | return 1; |
| 274 | else if (t > 0) |
| 275 | return 0; |
| 276 | |
| 277 | if (memcmp(&bpdu->bridge_id, &p->br->bridge_id, 8)) |
| 278 | return 1; |
| 279 | |
| 280 | if (bpdu->port_id <= p->designated_port) |
| 281 | return 1; |
| 282 | |
| 283 | return 0; |
| 284 | } |
| 285 | |
| 286 | /* called under bridge lock */ |
stephen hemminger | 160d73b | 2011-07-22 07:47:10 +0000 | [diff] [blame] | 287 | static void br_topology_change_acknowledged(struct net_bridge *br) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | { |
| 289 | br->topology_change_detected = 0; |
| 290 | del_timer(&br->tcn_timer); |
| 291 | } |
| 292 | |
| 293 | /* called under bridge lock */ |
| 294 | void br_topology_change_detection(struct net_bridge *br) |
| 295 | { |
| 296 | int isroot = br_is_root_bridge(br); |
| 297 | |
Stephen Hemminger | 4f0611a | 2009-05-15 06:11:58 +0000 | [diff] [blame] | 298 | if (br->stp_enabled != BR_KERNEL_STP) |
| 299 | return; |
| 300 | |
stephen hemminger | 28a16c9 | 2010-05-10 09:31:09 +0000 | [diff] [blame] | 301 | br_info(br, "topology change detected, %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | isroot ? "propagating" : "sending tcn bpdu"); |
| 303 | |
| 304 | if (isroot) { |
| 305 | br->topology_change = 1; |
| 306 | mod_timer(&br->topology_change_timer, jiffies |
| 307 | + br->bridge_forward_delay + br->bridge_max_age); |
| 308 | } else if (!br->topology_change_detected) { |
| 309 | br_transmit_tcn(br); |
| 310 | mod_timer(&br->tcn_timer, jiffies + br->bridge_hello_time); |
| 311 | } |
| 312 | |
| 313 | br->topology_change_detected = 1; |
| 314 | } |
| 315 | |
| 316 | /* called under bridge lock */ |
| 317 | void br_config_bpdu_generation(struct net_bridge *br) |
| 318 | { |
| 319 | struct net_bridge_port *p; |
| 320 | |
| 321 | list_for_each_entry(p, &br->port_list, list) { |
| 322 | if (p->state != BR_STATE_DISABLED && |
| 323 | br_is_designated_port(p)) |
| 324 | br_transmit_config(p); |
| 325 | } |
| 326 | } |
| 327 | |
| 328 | /* called under bridge lock */ |
stephen hemminger | 160d73b | 2011-07-22 07:47:10 +0000 | [diff] [blame] | 329 | static void br_reply(struct net_bridge_port *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | { |
| 331 | br_transmit_config(p); |
| 332 | } |
| 333 | |
| 334 | /* called under bridge lock */ |
| 335 | void br_configuration_update(struct net_bridge *br) |
| 336 | { |
| 337 | br_root_selection(br); |
| 338 | br_designated_port_selection(br); |
| 339 | } |
| 340 | |
| 341 | /* called under bridge lock */ |
| 342 | void br_become_designated_port(struct net_bridge_port *p) |
| 343 | { |
| 344 | struct net_bridge *br; |
| 345 | |
| 346 | br = p->br; |
| 347 | p->designated_root = br->designated_root; |
| 348 | p->designated_cost = br->root_path_cost; |
| 349 | p->designated_bridge = br->bridge_id; |
| 350 | p->designated_port = p->port_id; |
| 351 | } |
| 352 | |
| 353 | |
| 354 | /* called under bridge lock */ |
| 355 | static void br_make_blocking(struct net_bridge_port *p) |
| 356 | { |
| 357 | if (p->state != BR_STATE_DISABLED && |
| 358 | p->state != BR_STATE_BLOCKING) { |
| 359 | if (p->state == BR_STATE_FORWARDING || |
| 360 | p->state == BR_STATE_LEARNING) |
| 361 | br_topology_change_detection(p->br); |
| 362 | |
| 363 | p->state = BR_STATE_BLOCKING; |
| 364 | br_log_state(p); |
stephen hemminger | 4ecb961 | 2011-07-22 07:47:09 +0000 | [diff] [blame] | 365 | br_ifinfo_notify(RTM_NEWLINK, p); |
| 366 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | del_timer(&p->forward_delay_timer); |
| 368 | } |
| 369 | } |
| 370 | |
| 371 | /* called under bridge lock */ |
| 372 | static void br_make_forwarding(struct net_bridge_port *p) |
| 373 | { |
Stephen Hemminger | ef647f1 | 2008-08-05 18:42:51 -0700 | [diff] [blame] | 374 | struct net_bridge *br = p->br; |
Stephen Hemminger | 9cde070 | 2007-03-21 14:22:44 -0700 | [diff] [blame] | 375 | |
Stephen Hemminger | ef647f1 | 2008-08-05 18:42:51 -0700 | [diff] [blame] | 376 | if (p->state != BR_STATE_BLOCKING) |
| 377 | return; |
| 378 | |
stephen hemminger | a461c02 | 2011-03-10 05:57:04 +0000 | [diff] [blame] | 379 | if (br->stp_enabled == BR_NO_STP || br->forward_delay == 0) { |
Stephen Hemminger | ef647f1 | 2008-08-05 18:42:51 -0700 | [diff] [blame] | 380 | p->state = BR_STATE_FORWARDING; |
| 381 | br_topology_change_detection(br); |
| 382 | del_timer(&p->forward_delay_timer); |
stephen hemminger | 160d73b | 2011-07-22 07:47:10 +0000 | [diff] [blame] | 383 | } else if (br->stp_enabled == BR_KERNEL_STP) |
Stephen Hemminger | ef647f1 | 2008-08-05 18:42:51 -0700 | [diff] [blame] | 384 | p->state = BR_STATE_LISTENING; |
| 385 | else |
| 386 | p->state = BR_STATE_LEARNING; |
| 387 | |
Herbert Xu | 3fe2d7c | 2010-02-28 00:49:38 -0800 | [diff] [blame] | 388 | br_multicast_enable_port(p); |
Stephen Hemminger | ef647f1 | 2008-08-05 18:42:51 -0700 | [diff] [blame] | 389 | br_log_state(p); |
stephen hemminger | 4ecb961 | 2011-07-22 07:47:09 +0000 | [diff] [blame] | 390 | br_ifinfo_notify(RTM_NEWLINK, p); |
Stephen Hemminger | ef647f1 | 2008-08-05 18:42:51 -0700 | [diff] [blame] | 391 | |
| 392 | if (br->forward_delay != 0) |
| 393 | mod_timer(&p->forward_delay_timer, jiffies + br->forward_delay); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | } |
| 395 | |
| 396 | /* called under bridge lock */ |
| 397 | void br_port_state_selection(struct net_bridge *br) |
| 398 | { |
| 399 | struct net_bridge_port *p; |
stephen hemminger | 1faa435 | 2011-03-07 08:34:06 +0000 | [diff] [blame] | 400 | unsigned int liveports = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | |
| 402 | list_for_each_entry(p, &br->port_list, list) { |
stephen hemminger | 1faa435 | 2011-03-07 08:34:06 +0000 | [diff] [blame] | 403 | if (p->state == BR_STATE_DISABLED) |
| 404 | continue; |
| 405 | |
Vitalii Demianets | b03b6dd | 2011-11-25 00:16:37 +0000 | [diff] [blame] | 406 | /* Don't change port states if userspace is handling STP */ |
| 407 | if (br->stp_enabled != BR_USER_STP) { |
| 408 | if (p->port_no == br->root_port) { |
| 409 | p->config_pending = 0; |
| 410 | p->topology_change_ack = 0; |
| 411 | br_make_forwarding(p); |
| 412 | } else if (br_is_designated_port(p)) { |
| 413 | del_timer(&p->message_age_timer); |
| 414 | br_make_forwarding(p); |
| 415 | } else { |
| 416 | p->config_pending = 0; |
| 417 | p->topology_change_ack = 0; |
| 418 | br_make_blocking(p); |
| 419 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | } |
| 421 | |
stephen hemminger | 1faa435 | 2011-03-07 08:34:06 +0000 | [diff] [blame] | 422 | if (p->state == BR_STATE_FORWARDING) |
| 423 | ++liveports; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | } |
stephen hemminger | 1faa435 | 2011-03-07 08:34:06 +0000 | [diff] [blame] | 425 | |
| 426 | if (liveports == 0) |
| 427 | netif_carrier_off(br->dev); |
| 428 | else |
| 429 | netif_carrier_on(br->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | } |
| 431 | |
| 432 | /* called under bridge lock */ |
stephen hemminger | 160d73b | 2011-07-22 07:47:10 +0000 | [diff] [blame] | 433 | static void br_topology_change_acknowledge(struct net_bridge_port *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | { |
| 435 | p->topology_change_ack = 1; |
| 436 | br_transmit_config(p); |
| 437 | } |
| 438 | |
| 439 | /* called under bridge lock */ |
stephen hemminger | 160d73b | 2011-07-22 07:47:10 +0000 | [diff] [blame] | 440 | void br_received_config_bpdu(struct net_bridge_port *p, |
| 441 | const struct br_config_bpdu *bpdu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | { |
| 443 | struct net_bridge *br; |
| 444 | int was_root; |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 445 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | br = p->br; |
| 447 | was_root = br_is_root_bridge(br); |
| 448 | |
| 449 | if (br_supersedes_port_info(p, bpdu)) { |
| 450 | br_record_config_information(p, bpdu); |
| 451 | br_configuration_update(br); |
| 452 | br_port_state_selection(br); |
| 453 | |
| 454 | if (!br_is_root_bridge(br) && was_root) { |
| 455 | del_timer(&br->hello_timer); |
| 456 | if (br->topology_change_detected) { |
| 457 | del_timer(&br->topology_change_timer); |
| 458 | br_transmit_tcn(br); |
| 459 | |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 460 | mod_timer(&br->tcn_timer, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | jiffies + br->bridge_hello_time); |
| 462 | } |
| 463 | } |
| 464 | |
| 465 | if (p->port_no == br->root_port) { |
| 466 | br_record_config_timeout_values(br, bpdu); |
| 467 | br_config_bpdu_generation(br); |
| 468 | if (bpdu->topology_change_ack) |
| 469 | br_topology_change_acknowledged(br); |
| 470 | } |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 471 | } else if (br_is_designated_port(p)) { |
| 472 | br_reply(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | } |
| 474 | } |
| 475 | |
| 476 | /* called under bridge lock */ |
| 477 | void br_received_tcn_bpdu(struct net_bridge_port *p) |
| 478 | { |
| 479 | if (br_is_designated_port(p)) { |
stephen hemminger | 28a16c9 | 2010-05-10 09:31:09 +0000 | [diff] [blame] | 480 | br_info(p->br, "port %u(%s) received tcn bpdu\n", |
| 481 | (unsigned) p->port_no, p->dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | |
| 483 | br_topology_change_detection(p->br); |
| 484 | br_topology_change_acknowledge(p); |
| 485 | } |
| 486 | } |
stephen hemminger | 14f98f2 | 2011-04-04 14:03:33 +0000 | [diff] [blame] | 487 | |
| 488 | /* Change bridge STP parameter */ |
| 489 | int br_set_hello_time(struct net_bridge *br, unsigned long val) |
| 490 | { |
| 491 | unsigned long t = clock_t_to_jiffies(val); |
| 492 | |
| 493 | if (t < BR_MIN_HELLO_TIME || t > BR_MAX_HELLO_TIME) |
| 494 | return -ERANGE; |
| 495 | |
| 496 | spin_lock_bh(&br->lock); |
| 497 | br->bridge_hello_time = t; |
| 498 | if (br_is_root_bridge(br)) |
| 499 | br->hello_time = br->bridge_hello_time; |
| 500 | spin_unlock_bh(&br->lock); |
| 501 | return 0; |
| 502 | } |
| 503 | |
| 504 | int br_set_max_age(struct net_bridge *br, unsigned long val) |
| 505 | { |
| 506 | unsigned long t = clock_t_to_jiffies(val); |
| 507 | |
| 508 | if (t < BR_MIN_MAX_AGE || t > BR_MAX_MAX_AGE) |
| 509 | return -ERANGE; |
| 510 | |
| 511 | spin_lock_bh(&br->lock); |
| 512 | br->bridge_max_age = t; |
| 513 | if (br_is_root_bridge(br)) |
| 514 | br->max_age = br->bridge_max_age; |
| 515 | spin_unlock_bh(&br->lock); |
| 516 | return 0; |
| 517 | |
| 518 | } |
| 519 | |
| 520 | int br_set_forward_delay(struct net_bridge *br, unsigned long val) |
| 521 | { |
| 522 | unsigned long t = clock_t_to_jiffies(val); |
| 523 | |
| 524 | if (br->stp_enabled != BR_NO_STP && |
| 525 | (t < BR_MIN_FORWARD_DELAY || t > BR_MAX_FORWARD_DELAY)) |
| 526 | return -ERANGE; |
| 527 | |
| 528 | spin_lock_bh(&br->lock); |
| 529 | br->bridge_forward_delay = t; |
| 530 | if (br_is_root_bridge(br)) |
| 531 | br->forward_delay = br->bridge_forward_delay; |
| 532 | spin_unlock_bh(&br->lock); |
| 533 | return 0; |
| 534 | } |