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Commit | Line | Data |
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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 ER |
39 | int err; |
40 | ||
1da177e4 LT |
41 | p->port_id = br_make_port_id(p->priority, p->port_no); |
42 | br_become_designated_port(p); | |
775dd692 | 43 | br_set_state(p, BR_STATE_BLOCKING); |
1da177e4 LT |
44 | p->topology_change_ack = 0; |
45 | p->config_pending = 0; | |
6ac311ae | 46 | |
82dd4332 VD |
47 | err = __set_ageing_time(p->dev, p->br->ageing_time); |
48 | if (err) | |
49 | netdev_err(p->dev, "failed to offload ageing time\n"); | |
1da177e4 LT |
50 | } |
51 | ||
dba479f3 | 52 | /* NO locks held */ |
1da177e4 LT |
53 | void br_stp_enable_bridge(struct net_bridge *br) |
54 | { | |
55 | struct net_bridge_port *p; | |
56 | ||
57 | spin_lock_bh(&br->lock); | |
76b91c32 NA |
58 | if (br->stp_enabled == BR_KERNEL_STP) |
59 | mod_timer(&br->hello_timer, jiffies + br->hello_time); | |
f7cdee8a | 60 | mod_delayed_work(system_long_wq, &br->gc_work, HZ / 10); |
9d6f229f | 61 | |
1da177e4 LT |
62 | br_config_bpdu_generation(br); |
63 | ||
64 | list_for_each_entry(p, &br->port_list, list) { | |
576eb625 | 65 | if (netif_running(p->dev) && netif_oper_up(p->dev)) |
1da177e4 LT |
66 | br_stp_enable_port(p); |
67 | ||
68 | } | |
69 | spin_unlock_bh(&br->lock); | |
70 | } | |
71 | ||
72 | /* NO locks held */ | |
73 | void br_stp_disable_bridge(struct net_bridge *br) | |
74 | { | |
75 | struct net_bridge_port *p; | |
76 | ||
78872ccb | 77 | spin_lock_bh(&br->lock); |
1da177e4 LT |
78 | list_for_each_entry(p, &br->port_list, list) { |
79 | if (p->state != BR_STATE_DISABLED) | |
80 | br_stp_disable_port(p); | |
81 | ||
82 | } | |
83 | ||
8384b5f5 | 84 | __br_set_topology_change(br, 0); |
1da177e4 | 85 | br->topology_change_detected = 0; |
78872ccb | 86 | spin_unlock_bh(&br->lock); |
1da177e4 LT |
87 | |
88 | del_timer_sync(&br->hello_timer); | |
89 | del_timer_sync(&br->topology_change_timer); | |
90 | del_timer_sync(&br->tcn_timer); | |
f7cdee8a | 91 | cancel_delayed_work_sync(&br->gc_work); |
1da177e4 LT |
92 | } |
93 | ||
94 | /* called under bridge lock */ | |
95 | void br_stp_enable_port(struct net_bridge_port *p) | |
96 | { | |
97 | br_init_port(p); | |
98 | br_port_state_selection(p->br); | |
4ecb961c | 99 | br_ifinfo_notify(RTM_NEWLINK, p); |
1da177e4 LT |
100 | } |
101 | ||
102 | /* called under bridge lock */ | |
103 | void br_stp_disable_port(struct net_bridge_port *p) | |
104 | { | |
28a16c97 | 105 | struct net_bridge *br = p->br; |
1da177e4 LT |
106 | int wasroot; |
107 | ||
1da177e4 LT |
108 | wasroot = br_is_root_bridge(br); |
109 | br_become_designated_port(p); | |
775dd692 | 110 | br_set_state(p, BR_STATE_DISABLED); |
1da177e4 LT |
111 | p->topology_change_ack = 0; |
112 | p->config_pending = 0; | |
113 | ||
4ecb961c | 114 | br_ifinfo_notify(RTM_NEWLINK, p); |
115 | ||
1da177e4 LT |
116 | del_timer(&p->message_age_timer); |
117 | del_timer(&p->forward_delay_timer); | |
118 | del_timer(&p->hold_timer); | |
119 | ||
1ea2d020 | 120 | br_fdb_delete_by_port(br, p, 0, 0); |
3fe2d7c7 | 121 | br_multicast_disable_port(p); |
1a620698 | 122 | |
1da177e4 LT |
123 | br_configuration_update(br); |
124 | ||
125 | br_port_state_selection(br); | |
126 | ||
127 | if (br_is_root_bridge(br) && !wasroot) | |
128 | br_become_root_bridge(br); | |
129 | } | |
130 | ||
30843315 | 131 | static int br_stp_call_user(struct net_bridge *br, char *arg) |
9cde0708 | 132 | { |
30843315 | 133 | char *argv[] = { BR_STP_PROG, br->dev->name, arg, NULL }; |
9cde0708 | 134 | char *envp[] = { NULL }; |
30843315 VD |
135 | int rc; |
136 | ||
137 | /* call userspace STP and report program errors */ | |
138 | rc = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC); | |
139 | if (rc > 0) { | |
140 | if (rc & 0xff) | |
141 | br_debug(br, BR_STP_PROG " received signal %d\n", | |
142 | rc & 0x7f); | |
143 | else | |
144 | br_debug(br, BR_STP_PROG " exited with code %d\n", | |
145 | (rc >> 8) & 0xff); | |
146 | } | |
147 | ||
148 | return rc; | |
149 | } | |
150 | ||
151 | static void br_stp_start(struct net_bridge *br) | |
152 | { | |
30843315 | 153 | int err = -ENOENT; |
9cde0708 | 154 | |
ff621985 | 155 | if (net_eq(dev_net(br->dev), &init_net)) |
30843315 VD |
156 | err = br_stp_call_user(br, "start"); |
157 | ||
158 | if (err && err != -ENOENT) | |
159 | br_err(br, "failed to start userspace STP (%d)\n", err); | |
be4f154d HX |
160 | |
161 | spin_lock_bh(&br->lock); | |
162 | ||
163 | if (br->bridge_forward_delay < BR_MIN_FORWARD_DELAY) | |
164 | __br_set_forward_delay(br, BR_MIN_FORWARD_DELAY); | |
4b6c7879 | 165 | else if (br->bridge_forward_delay > BR_MAX_FORWARD_DELAY) |
be4f154d HX |
166 | __br_set_forward_delay(br, BR_MAX_FORWARD_DELAY); |
167 | ||
30843315 | 168 | if (!err) { |
9cde0708 | 169 | br->stp_enabled = BR_USER_STP; |
28a16c97 | 170 | br_debug(br, "userspace STP started\n"); |
9cde0708 SH |
171 | } else { |
172 | br->stp_enabled = BR_KERNEL_STP; | |
28a16c97 | 173 | br_debug(br, "using kernel STP\n"); |
9cde0708 SH |
174 | |
175 | /* To start timers on any ports left in blocking */ | |
aeb07324 NA |
176 | if (br->dev->flags & IFF_UP) |
177 | mod_timer(&br->hello_timer, jiffies + br->hello_time); | |
9cde0708 | 178 | br_port_state_selection(br); |
9cde0708 | 179 | } |
be4f154d HX |
180 | |
181 | spin_unlock_bh(&br->lock); | |
9cde0708 SH |
182 | } |
183 | ||
184 | static void br_stp_stop(struct net_bridge *br) | |
185 | { | |
30843315 | 186 | int err; |
9cde0708 SH |
187 | |
188 | if (br->stp_enabled == BR_USER_STP) { | |
30843315 VD |
189 | err = br_stp_call_user(br, "stop"); |
190 | if (err) | |
191 | br_err(br, "failed to stop userspace STP (%d)\n", err); | |
9cde0708 SH |
192 | |
193 | /* To start timers on any ports left in blocking */ | |
194 | spin_lock_bh(&br->lock); | |
195 | br_port_state_selection(br); | |
196 | spin_unlock_bh(&br->lock); | |
197 | } | |
198 | ||
199 | br->stp_enabled = BR_NO_STP; | |
200 | } | |
201 | ||
202 | void br_stp_set_enabled(struct net_bridge *br, unsigned long val) | |
203 | { | |
204 | ASSERT_RTNL(); | |
205 | ||
206 | if (val) { | |
207 | if (br->stp_enabled == BR_NO_STP) | |
208 | br_stp_start(br); | |
209 | } else { | |
210 | if (br->stp_enabled != BR_NO_STP) | |
211 | br_stp_stop(br); | |
212 | } | |
213 | } | |
214 | ||
1da177e4 | 215 | /* called under bridge lock */ |
4505a3ef | 216 | void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *addr) |
1da177e4 | 217 | { |
9a7b6ef9 | 218 | /* should be aligned on 2 bytes for ether_addr_equal() */ |
19bb3506 EK |
219 | unsigned short oldaddr_aligned[ETH_ALEN >> 1]; |
220 | unsigned char *oldaddr = (unsigned char *)oldaddr_aligned; | |
1da177e4 LT |
221 | struct net_bridge_port *p; |
222 | int wasroot; | |
223 | ||
224 | wasroot = br_is_root_bridge(br); | |
225 | ||
a4b816d8 TM |
226 | br_fdb_change_mac_address(br, addr); |
227 | ||
1da177e4 LT |
228 | memcpy(oldaddr, br->bridge_id.addr, ETH_ALEN); |
229 | memcpy(br->bridge_id.addr, addr, ETH_ALEN); | |
230 | memcpy(br->dev->dev_addr, addr, ETH_ALEN); | |
231 | ||
232 | list_for_each_entry(p, &br->port_list, list) { | |
9a7b6ef9 | 233 | if (ether_addr_equal(p->designated_bridge.addr, oldaddr)) |
1da177e4 LT |
234 | memcpy(p->designated_bridge.addr, addr, ETH_ALEN); |
235 | ||
9a7b6ef9 | 236 | if (ether_addr_equal(p->designated_root.addr, oldaddr)) |
1da177e4 | 237 | memcpy(p->designated_root.addr, addr, ETH_ALEN); |
1da177e4 LT |
238 | } |
239 | ||
240 | br_configuration_update(br); | |
241 | br_port_state_selection(br); | |
242 | if (br_is_root_bridge(br) && !wasroot) | |
243 | br_become_root_bridge(br); | |
244 | } | |
245 | ||
9a7b6ef9 | 246 | /* should be aligned on 2 bytes for ether_addr_equal() */ |
19bb3506 | 247 | static const unsigned short br_mac_zero_aligned[ETH_ALEN >> 1]; |
1da177e4 LT |
248 | |
249 | /* called under bridge lock */ | |
edf947f1 | 250 | bool br_stp_recalculate_bridge_id(struct net_bridge *br) |
1da177e4 | 251 | { |
19bb3506 EK |
252 | const unsigned char *br_mac_zero = |
253 | (const unsigned char *)br_mac_zero_aligned; | |
1da177e4 LT |
254 | const unsigned char *addr = br_mac_zero; |
255 | struct net_bridge_port *p; | |
256 | ||
92c0574f | 257 | /* user has chosen a value so keep it */ |
b2748267 | 258 | if (br->dev->addr_assign_type == NET_ADDR_SET) |
1459a3cc | 259 | return false; |
92c0574f | 260 | |
1da177e4 LT |
261 | list_for_each_entry(p, &br->port_list, list) { |
262 | if (addr == br_mac_zero || | |
554c9a8e | 263 | memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0) |
1da177e4 LT |
264 | addr = p->dev->dev_addr; |
265 | ||
266 | } | |
267 | ||
9a7b6ef9 | 268 | if (ether_addr_equal(br->bridge_id.addr, addr)) |
edf947f1 | 269 | return false; /* no change */ |
270 | ||
271 | br_stp_change_bridge_id(br, addr); | |
272 | return true; | |
1da177e4 LT |
273 | } |
274 | ||
2dab80a8 | 275 | /* Acquires and releases bridge lock */ |
1da177e4 LT |
276 | void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio) |
277 | { | |
278 | struct net_bridge_port *p; | |
279 | int wasroot; | |
280 | ||
2dab80a8 | 281 | spin_lock_bh(&br->lock); |
1da177e4 LT |
282 | wasroot = br_is_root_bridge(br); |
283 | ||
284 | list_for_each_entry(p, &br->port_list, list) { | |
285 | if (p->state != BR_STATE_DISABLED && | |
286 | br_is_designated_port(p)) { | |
287 | p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF; | |
288 | p->designated_bridge.prio[1] = newprio & 0xFF; | |
289 | } | |
290 | ||
291 | } | |
292 | ||
293 | br->bridge_id.prio[0] = (newprio >> 8) & 0xFF; | |
294 | br->bridge_id.prio[1] = newprio & 0xFF; | |
295 | br_configuration_update(br); | |
296 | br_port_state_selection(br); | |
297 | if (br_is_root_bridge(br) && !wasroot) | |
298 | br_become_root_bridge(br); | |
2dab80a8 | 299 | spin_unlock_bh(&br->lock); |
1da177e4 LT |
300 | } |
301 | ||
302 | /* called under bridge lock */ | |
14f98f25 | 303 | int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio) |
1da177e4 | 304 | { |
14f98f25 | 305 | port_id new_port_id; |
306 | ||
307 | if (newprio > BR_MAX_PORT_PRIORITY) | |
308 | return -ERANGE; | |
1da177e4 | 309 | |
14f98f25 | 310 | new_port_id = br_make_port_id(newprio, p->port_no); |
1da177e4 LT |
311 | if (br_is_designated_port(p)) |
312 | p->designated_port = new_port_id; | |
313 | ||
314 | p->port_id = new_port_id; | |
315 | p->priority = newprio; | |
316 | if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) && | |
317 | p->port_id < p->designated_port) { | |
318 | br_become_designated_port(p); | |
319 | br_port_state_selection(p->br); | |
320 | } | |
14f98f25 | 321 | |
322 | return 0; | |
1da177e4 LT |
323 | } |
324 | ||
325 | /* called under bridge lock */ | |
14f98f25 | 326 | int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost) |
1da177e4 | 327 | { |
14f98f25 | 328 | if (path_cost < BR_MIN_PATH_COST || |
329 | path_cost > BR_MAX_PATH_COST) | |
330 | return -ERANGE; | |
331 | ||
8f3359bd | 332 | p->flags |= BR_ADMIN_COST; |
1da177e4 LT |
333 | p->path_cost = path_cost; |
334 | br_configuration_update(p->br); | |
335 | br_port_state_selection(p->br); | |
14f98f25 | 336 | return 0; |
1da177e4 LT |
337 | } |
338 | ||
339 | ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id) | |
340 | { | |
341 | return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n", | |
342 | id->prio[0], id->prio[1], | |
343 | id->addr[0], id->addr[1], id->addr[2], | |
344 | id->addr[3], id->addr[4], id->addr[5]); | |
345 | } |