Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Spanning tree protocol; interface code | |
3 | * Linux ethernet bridge | |
4 | * | |
5 | * Authors: | |
6 | * Lennert Buytenhek <buytenh@gnu.org> | |
7 | * | |
1da177e4 LT |
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 | ||
14 | #include <linux/kernel.h> | |
79bb1ee4 | 15 | #include <linux/kmod.h> |
6ede2463 | 16 | #include <linux/etherdevice.h> |
11dc1f36 | 17 | #include <linux/rtnetlink.h> |
6ac311ae | 18 | #include <net/switchdev.h> |
1da177e4 LT |
19 | |
20 | #include "br_private.h" | |
21 | #include "br_private_stp.h" | |
22 | ||
23 | ||
24 | /* Port id is composed of priority and port number. | |
14f98f25 | 25 | * NB: some bits of priority are dropped to |
1da177e4 LT |
26 | * make room for more ports. |
27 | */ | |
28 | static inline port_id br_make_port_id(__u8 priority, __u16 port_no) | |
29 | { | |
9d6f229f | 30 | return ((u16)priority << BR_PORT_BITS) |
1da177e4 LT |
31 | | (port_no & ((1<<BR_PORT_BITS)-1)); |
32 | } | |
33 | ||
14f98f25 | 34 | #define BR_MAX_PORT_PRIORITY ((u16)~0 >> BR_PORT_BITS) |
35 | ||
1da177e4 LT |
36 | /* called under bridge lock */ |
37 | void br_init_port(struct net_bridge_port *p) | |
38 | { | |
6ac311ae | 39 | struct switchdev_attr attr = { |
6ff64f6f | 40 | .orig_dev = p->dev, |
6ac311ae ER |
41 | .id = SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME, |
42 | .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP | SWITCHDEV_F_DEFER, | |
ef9cdd0f | 43 | .u.ageing_time = jiffies_to_clock_t(p->br->ageing_time), |
6ac311ae ER |
44 | }; |
45 | int err; | |
46 | ||
1da177e4 LT |
47 | p->port_id = br_make_port_id(p->priority, p->port_no); |
48 | br_become_designated_port(p); | |
775dd692 | 49 | br_set_state(p, BR_STATE_BLOCKING); |
1da177e4 LT |
50 | p->topology_change_ack = 0; |
51 | p->config_pending = 0; | |
6ac311ae ER |
52 | |
53 | err = switchdev_port_attr_set(p->dev, &attr); | |
bbe14f54 | 54 | if (err && err != -EOPNOTSUPP) |
6ac311ae | 55 | netdev_err(p->dev, "failed to set HW ageing time\n"); |
1da177e4 LT |
56 | } |
57 | ||
dba479f3 | 58 | /* NO locks held */ |
1da177e4 LT |
59 | void br_stp_enable_bridge(struct net_bridge *br) |
60 | { | |
61 | struct net_bridge_port *p; | |
62 | ||
63 | spin_lock_bh(&br->lock); | |
76b91c32 NA |
64 | if (br->stp_enabled == BR_KERNEL_STP) |
65 | mod_timer(&br->hello_timer, jiffies + br->hello_time); | |
1da177e4 | 66 | mod_timer(&br->gc_timer, jiffies + HZ/10); |
9d6f229f | 67 | |
1da177e4 LT |
68 | br_config_bpdu_generation(br); |
69 | ||
70 | list_for_each_entry(p, &br->port_list, list) { | |
576eb625 | 71 | if (netif_running(p->dev) && netif_oper_up(p->dev)) |
1da177e4 LT |
72 | br_stp_enable_port(p); |
73 | ||
74 | } | |
75 | spin_unlock_bh(&br->lock); | |
76 | } | |
77 | ||
78 | /* NO locks held */ | |
79 | void br_stp_disable_bridge(struct net_bridge *br) | |
80 | { | |
81 | struct net_bridge_port *p; | |
82 | ||
78872ccb | 83 | spin_lock_bh(&br->lock); |
1da177e4 LT |
84 | list_for_each_entry(p, &br->port_list, list) { |
85 | if (p->state != BR_STATE_DISABLED) | |
86 | br_stp_disable_port(p); | |
87 | ||
88 | } | |
89 | ||
90 | br->topology_change = 0; | |
91 | br->topology_change_detected = 0; | |
78872ccb | 92 | spin_unlock_bh(&br->lock); |
1da177e4 LT |
93 | |
94 | del_timer_sync(&br->hello_timer); | |
95 | del_timer_sync(&br->topology_change_timer); | |
96 | del_timer_sync(&br->tcn_timer); | |
97 | del_timer_sync(&br->gc_timer); | |
98 | } | |
99 | ||
100 | /* called under bridge lock */ | |
101 | void br_stp_enable_port(struct net_bridge_port *p) | |
102 | { | |
103 | br_init_port(p); | |
104 | br_port_state_selection(p->br); | |
4ecb961c | 105 | br_ifinfo_notify(RTM_NEWLINK, p); |
1da177e4 LT |
106 | } |
107 | ||
108 | /* called under bridge lock */ | |
109 | void br_stp_disable_port(struct net_bridge_port *p) | |
110 | { | |
28a16c97 | 111 | struct net_bridge *br = p->br; |
1da177e4 LT |
112 | int wasroot; |
113 | ||
1da177e4 LT |
114 | wasroot = br_is_root_bridge(br); |
115 | br_become_designated_port(p); | |
775dd692 | 116 | br_set_state(p, BR_STATE_DISABLED); |
1da177e4 LT |
117 | p->topology_change_ack = 0; |
118 | p->config_pending = 0; | |
119 | ||
4ecb961c | 120 | br_ifinfo_notify(RTM_NEWLINK, p); |
121 | ||
1da177e4 LT |
122 | del_timer(&p->message_age_timer); |
123 | del_timer(&p->forward_delay_timer); | |
124 | del_timer(&p->hold_timer); | |
125 | ||
1ea2d020 | 126 | br_fdb_delete_by_port(br, p, 0, 0); |
3fe2d7c7 | 127 | br_multicast_disable_port(p); |
1a620698 | 128 | |
1da177e4 LT |
129 | br_configuration_update(br); |
130 | ||
131 | br_port_state_selection(br); | |
132 | ||
133 | if (br_is_root_bridge(br) && !wasroot) | |
134 | br_become_root_bridge(br); | |
135 | } | |
136 | ||
30843315 | 137 | static int br_stp_call_user(struct net_bridge *br, char *arg) |
9cde0708 | 138 | { |
30843315 | 139 | char *argv[] = { BR_STP_PROG, br->dev->name, arg, NULL }; |
9cde0708 | 140 | char *envp[] = { NULL }; |
30843315 VD |
141 | int rc; |
142 | ||
143 | /* call userspace STP and report program errors */ | |
144 | rc = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC); | |
145 | if (rc > 0) { | |
146 | if (rc & 0xff) | |
147 | br_debug(br, BR_STP_PROG " received signal %d\n", | |
148 | rc & 0x7f); | |
149 | else | |
150 | br_debug(br, BR_STP_PROG " exited with code %d\n", | |
151 | (rc >> 8) & 0xff); | |
152 | } | |
153 | ||
154 | return rc; | |
155 | } | |
156 | ||
157 | static void br_stp_start(struct net_bridge *br) | |
158 | { | |
76b91c32 | 159 | struct net_bridge_port *p; |
30843315 | 160 | int err = -ENOENT; |
9cde0708 | 161 | |
ff621985 | 162 | if (net_eq(dev_net(br->dev), &init_net)) |
30843315 VD |
163 | err = br_stp_call_user(br, "start"); |
164 | ||
165 | if (err && err != -ENOENT) | |
166 | br_err(br, "failed to start userspace STP (%d)\n", err); | |
be4f154d HX |
167 | |
168 | spin_lock_bh(&br->lock); | |
169 | ||
170 | if (br->bridge_forward_delay < BR_MIN_FORWARD_DELAY) | |
171 | __br_set_forward_delay(br, BR_MIN_FORWARD_DELAY); | |
4b6c7879 | 172 | else if (br->bridge_forward_delay > BR_MAX_FORWARD_DELAY) |
be4f154d HX |
173 | __br_set_forward_delay(br, BR_MAX_FORWARD_DELAY); |
174 | ||
30843315 | 175 | if (!err) { |
9cde0708 | 176 | br->stp_enabled = BR_USER_STP; |
28a16c97 | 177 | br_debug(br, "userspace STP started\n"); |
30843315 | 178 | |
76b91c32 NA |
179 | /* Stop hello and hold timers */ |
180 | del_timer(&br->hello_timer); | |
181 | list_for_each_entry(p, &br->port_list, list) | |
182 | del_timer(&p->hold_timer); | |
9cde0708 SH |
183 | } else { |
184 | br->stp_enabled = BR_KERNEL_STP; | |
28a16c97 | 185 | br_debug(br, "using kernel STP\n"); |
9cde0708 SH |
186 | |
187 | /* To start timers on any ports left in blocking */ | |
9cde0708 | 188 | br_port_state_selection(br); |
9cde0708 | 189 | } |
be4f154d HX |
190 | |
191 | spin_unlock_bh(&br->lock); | |
9cde0708 SH |
192 | } |
193 | ||
194 | static void br_stp_stop(struct net_bridge *br) | |
195 | { | |
76b91c32 | 196 | struct net_bridge_port *p; |
30843315 | 197 | int err; |
9cde0708 SH |
198 | |
199 | if (br->stp_enabled == BR_USER_STP) { | |
30843315 VD |
200 | err = br_stp_call_user(br, "stop"); |
201 | if (err) | |
202 | br_err(br, "failed to stop userspace STP (%d)\n", err); | |
9cde0708 SH |
203 | |
204 | /* To start timers on any ports left in blocking */ | |
76b91c32 NA |
205 | mod_timer(&br->hello_timer, jiffies + br->hello_time); |
206 | list_for_each_entry(p, &br->port_list, list) | |
207 | mod_timer(&p->hold_timer, | |
208 | round_jiffies(jiffies + BR_HOLD_TIME)); | |
9cde0708 SH |
209 | spin_lock_bh(&br->lock); |
210 | br_port_state_selection(br); | |
211 | spin_unlock_bh(&br->lock); | |
212 | } | |
213 | ||
214 | br->stp_enabled = BR_NO_STP; | |
215 | } | |
216 | ||
217 | void br_stp_set_enabled(struct net_bridge *br, unsigned long val) | |
218 | { | |
219 | ASSERT_RTNL(); | |
220 | ||
221 | if (val) { | |
222 | if (br->stp_enabled == BR_NO_STP) | |
223 | br_stp_start(br); | |
224 | } else { | |
225 | if (br->stp_enabled != BR_NO_STP) | |
226 | br_stp_stop(br); | |
227 | } | |
228 | } | |
229 | ||
1da177e4 | 230 | /* called under bridge lock */ |
4505a3ef | 231 | void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *addr) |
1da177e4 | 232 | { |
9a7b6ef9 | 233 | /* should be aligned on 2 bytes for ether_addr_equal() */ |
19bb3506 EK |
234 | unsigned short oldaddr_aligned[ETH_ALEN >> 1]; |
235 | unsigned char *oldaddr = (unsigned char *)oldaddr_aligned; | |
1da177e4 LT |
236 | struct net_bridge_port *p; |
237 | int wasroot; | |
238 | ||
239 | wasroot = br_is_root_bridge(br); | |
240 | ||
a4b816d8 TM |
241 | br_fdb_change_mac_address(br, addr); |
242 | ||
1da177e4 LT |
243 | memcpy(oldaddr, br->bridge_id.addr, ETH_ALEN); |
244 | memcpy(br->bridge_id.addr, addr, ETH_ALEN); | |
245 | memcpy(br->dev->dev_addr, addr, ETH_ALEN); | |
246 | ||
247 | list_for_each_entry(p, &br->port_list, list) { | |
9a7b6ef9 | 248 | if (ether_addr_equal(p->designated_bridge.addr, oldaddr)) |
1da177e4 LT |
249 | memcpy(p->designated_bridge.addr, addr, ETH_ALEN); |
250 | ||
9a7b6ef9 | 251 | if (ether_addr_equal(p->designated_root.addr, oldaddr)) |
1da177e4 | 252 | memcpy(p->designated_root.addr, addr, ETH_ALEN); |
1da177e4 LT |
253 | } |
254 | ||
255 | br_configuration_update(br); | |
256 | br_port_state_selection(br); | |
257 | if (br_is_root_bridge(br) && !wasroot) | |
258 | br_become_root_bridge(br); | |
259 | } | |
260 | ||
9a7b6ef9 | 261 | /* should be aligned on 2 bytes for ether_addr_equal() */ |
19bb3506 | 262 | static const unsigned short br_mac_zero_aligned[ETH_ALEN >> 1]; |
1da177e4 LT |
263 | |
264 | /* called under bridge lock */ | |
edf947f1 | 265 | bool br_stp_recalculate_bridge_id(struct net_bridge *br) |
1da177e4 | 266 | { |
19bb3506 EK |
267 | const unsigned char *br_mac_zero = |
268 | (const unsigned char *)br_mac_zero_aligned; | |
1da177e4 LT |
269 | const unsigned char *addr = br_mac_zero; |
270 | struct net_bridge_port *p; | |
271 | ||
92c0574f | 272 | /* user has chosen a value so keep it */ |
b2748267 | 273 | if (br->dev->addr_assign_type == NET_ADDR_SET) |
1459a3cc | 274 | return false; |
92c0574f | 275 | |
1da177e4 LT |
276 | list_for_each_entry(p, &br->port_list, list) { |
277 | if (addr == br_mac_zero || | |
554c9a8e | 278 | memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0) |
1da177e4 LT |
279 | addr = p->dev->dev_addr; |
280 | ||
281 | } | |
282 | ||
9a7b6ef9 | 283 | if (ether_addr_equal(br->bridge_id.addr, addr)) |
edf947f1 | 284 | return false; /* no change */ |
285 | ||
286 | br_stp_change_bridge_id(br, addr); | |
287 | return true; | |
1da177e4 LT |
288 | } |
289 | ||
2dab80a8 | 290 | /* Acquires and releases bridge lock */ |
1da177e4 LT |
291 | void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio) |
292 | { | |
293 | struct net_bridge_port *p; | |
294 | int wasroot; | |
295 | ||
2dab80a8 | 296 | spin_lock_bh(&br->lock); |
1da177e4 LT |
297 | wasroot = br_is_root_bridge(br); |
298 | ||
299 | list_for_each_entry(p, &br->port_list, list) { | |
300 | if (p->state != BR_STATE_DISABLED && | |
301 | br_is_designated_port(p)) { | |
302 | p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF; | |
303 | p->designated_bridge.prio[1] = newprio & 0xFF; | |
304 | } | |
305 | ||
306 | } | |
307 | ||
308 | br->bridge_id.prio[0] = (newprio >> 8) & 0xFF; | |
309 | br->bridge_id.prio[1] = newprio & 0xFF; | |
310 | br_configuration_update(br); | |
311 | br_port_state_selection(br); | |
312 | if (br_is_root_bridge(br) && !wasroot) | |
313 | br_become_root_bridge(br); | |
2dab80a8 | 314 | spin_unlock_bh(&br->lock); |
1da177e4 LT |
315 | } |
316 | ||
317 | /* called under bridge lock */ | |
14f98f25 | 318 | int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio) |
1da177e4 | 319 | { |
14f98f25 | 320 | port_id new_port_id; |
321 | ||
322 | if (newprio > BR_MAX_PORT_PRIORITY) | |
323 | return -ERANGE; | |
1da177e4 | 324 | |
14f98f25 | 325 | new_port_id = br_make_port_id(newprio, p->port_no); |
1da177e4 LT |
326 | if (br_is_designated_port(p)) |
327 | p->designated_port = new_port_id; | |
328 | ||
329 | p->port_id = new_port_id; | |
330 | p->priority = newprio; | |
331 | if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) && | |
332 | p->port_id < p->designated_port) { | |
333 | br_become_designated_port(p); | |
334 | br_port_state_selection(p->br); | |
335 | } | |
14f98f25 | 336 | |
337 | return 0; | |
1da177e4 LT |
338 | } |
339 | ||
340 | /* called under bridge lock */ | |
14f98f25 | 341 | int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost) |
1da177e4 | 342 | { |
14f98f25 | 343 | if (path_cost < BR_MIN_PATH_COST || |
344 | path_cost > BR_MAX_PATH_COST) | |
345 | return -ERANGE; | |
346 | ||
8f3359bd | 347 | p->flags |= BR_ADMIN_COST; |
1da177e4 LT |
348 | p->path_cost = path_cost; |
349 | br_configuration_update(p->br); | |
350 | br_port_state_selection(p->br); | |
14f98f25 | 351 | return 0; |
1da177e4 LT |
352 | } |
353 | ||
354 | ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id) | |
355 | { | |
356 | return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n", | |
357 | id->prio[0], id->prio[1], | |
358 | id->addr[0], id->addr[1], id->addr[2], | |
359 | id->addr[3], id->addr[4], id->addr[5]); | |
360 | } |