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> |
1da177e4 LT |
18 | |
19 | #include "br_private.h" | |
20 | #include "br_private_stp.h" | |
21 | ||
22 | ||
23 | /* Port id is composed of priority and port number. | |
14f98f25 | 24 | * NB: some bits of priority are dropped to |
1da177e4 LT |
25 | * make room for more ports. |
26 | */ | |
27 | static inline port_id br_make_port_id(__u8 priority, __u16 port_no) | |
28 | { | |
9d6f229f | 29 | return ((u16)priority << BR_PORT_BITS) |
1da177e4 LT |
30 | | (port_no & ((1<<BR_PORT_BITS)-1)); |
31 | } | |
32 | ||
14f98f25 | 33 | #define BR_MAX_PORT_PRIORITY ((u16)~0 >> BR_PORT_BITS) |
34 | ||
1da177e4 LT |
35 | /* called under bridge lock */ |
36 | void br_init_port(struct net_bridge_port *p) | |
37 | { | |
38 | p->port_id = br_make_port_id(p->priority, p->port_no); | |
39 | br_become_designated_port(p); | |
775dd692 | 40 | br_set_state(p, BR_STATE_BLOCKING); |
1da177e4 LT |
41 | p->topology_change_ack = 0; |
42 | p->config_pending = 0; | |
1da177e4 LT |
43 | } |
44 | ||
45 | /* called under bridge lock */ | |
46 | void br_stp_enable_bridge(struct net_bridge *br) | |
47 | { | |
48 | struct net_bridge_port *p; | |
49 | ||
50 | spin_lock_bh(&br->lock); | |
76b91c32 NA |
51 | if (br->stp_enabled == BR_KERNEL_STP) |
52 | mod_timer(&br->hello_timer, jiffies + br->hello_time); | |
1da177e4 | 53 | mod_timer(&br->gc_timer, jiffies + HZ/10); |
9d6f229f | 54 | |
1da177e4 LT |
55 | br_config_bpdu_generation(br); |
56 | ||
57 | list_for_each_entry(p, &br->port_list, list) { | |
576eb625 | 58 | if (netif_running(p->dev) && netif_oper_up(p->dev)) |
1da177e4 LT |
59 | br_stp_enable_port(p); |
60 | ||
61 | } | |
62 | spin_unlock_bh(&br->lock); | |
63 | } | |
64 | ||
65 | /* NO locks held */ | |
66 | void br_stp_disable_bridge(struct net_bridge *br) | |
67 | { | |
68 | struct net_bridge_port *p; | |
69 | ||
78872ccb | 70 | spin_lock_bh(&br->lock); |
1da177e4 LT |
71 | list_for_each_entry(p, &br->port_list, list) { |
72 | if (p->state != BR_STATE_DISABLED) | |
73 | br_stp_disable_port(p); | |
74 | ||
75 | } | |
76 | ||
77 | br->topology_change = 0; | |
78 | br->topology_change_detected = 0; | |
78872ccb | 79 | spin_unlock_bh(&br->lock); |
1da177e4 LT |
80 | |
81 | del_timer_sync(&br->hello_timer); | |
82 | del_timer_sync(&br->topology_change_timer); | |
83 | del_timer_sync(&br->tcn_timer); | |
84 | del_timer_sync(&br->gc_timer); | |
85 | } | |
86 | ||
87 | /* called under bridge lock */ | |
88 | void br_stp_enable_port(struct net_bridge_port *p) | |
89 | { | |
90 | br_init_port(p); | |
91 | br_port_state_selection(p->br); | |
28a16c97 | 92 | br_log_state(p); |
4ecb961c | 93 | br_ifinfo_notify(RTM_NEWLINK, p); |
1da177e4 LT |
94 | } |
95 | ||
96 | /* called under bridge lock */ | |
97 | void br_stp_disable_port(struct net_bridge_port *p) | |
98 | { | |
28a16c97 | 99 | struct net_bridge *br = p->br; |
1da177e4 LT |
100 | int wasroot; |
101 | ||
1da177e4 LT |
102 | wasroot = br_is_root_bridge(br); |
103 | br_become_designated_port(p); | |
775dd692 | 104 | br_set_state(p, BR_STATE_DISABLED); |
1da177e4 LT |
105 | p->topology_change_ack = 0; |
106 | p->config_pending = 0; | |
107 | ||
5200959b | 108 | br_log_state(p); |
4ecb961c | 109 | br_ifinfo_notify(RTM_NEWLINK, p); |
110 | ||
1da177e4 LT |
111 | del_timer(&p->message_age_timer); |
112 | del_timer(&p->forward_delay_timer); | |
113 | del_timer(&p->hold_timer); | |
114 | ||
1ea2d020 | 115 | br_fdb_delete_by_port(br, p, 0, 0); |
3fe2d7c7 | 116 | br_multicast_disable_port(p); |
1a620698 | 117 | |
1da177e4 LT |
118 | br_configuration_update(br); |
119 | ||
120 | br_port_state_selection(br); | |
121 | ||
122 | if (br_is_root_bridge(br) && !wasroot) | |
123 | br_become_root_bridge(br); | |
124 | } | |
125 | ||
9cde0708 SH |
126 | static void br_stp_start(struct net_bridge *br) |
127 | { | |
128 | int r; | |
129 | char *argv[] = { BR_STP_PROG, br->dev->name, "start", NULL }; | |
130 | char *envp[] = { NULL }; | |
76b91c32 | 131 | struct net_bridge_port *p; |
9cde0708 | 132 | |
86313c48 | 133 | r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC); |
be4f154d HX |
134 | |
135 | spin_lock_bh(&br->lock); | |
136 | ||
137 | if (br->bridge_forward_delay < BR_MIN_FORWARD_DELAY) | |
138 | __br_set_forward_delay(br, BR_MIN_FORWARD_DELAY); | |
4b6c7879 | 139 | else if (br->bridge_forward_delay > BR_MAX_FORWARD_DELAY) |
be4f154d HX |
140 | __br_set_forward_delay(br, BR_MAX_FORWARD_DELAY); |
141 | ||
9cde0708 SH |
142 | if (r == 0) { |
143 | br->stp_enabled = BR_USER_STP; | |
28a16c97 | 144 | br_debug(br, "userspace STP started\n"); |
76b91c32 NA |
145 | /* Stop hello and hold timers */ |
146 | del_timer(&br->hello_timer); | |
147 | list_for_each_entry(p, &br->port_list, list) | |
148 | del_timer(&p->hold_timer); | |
9cde0708 SH |
149 | } else { |
150 | br->stp_enabled = BR_KERNEL_STP; | |
28a16c97 | 151 | br_debug(br, "using kernel STP\n"); |
9cde0708 SH |
152 | |
153 | /* To start timers on any ports left in blocking */ | |
9cde0708 | 154 | br_port_state_selection(br); |
9cde0708 | 155 | } |
be4f154d HX |
156 | |
157 | spin_unlock_bh(&br->lock); | |
9cde0708 SH |
158 | } |
159 | ||
160 | static void br_stp_stop(struct net_bridge *br) | |
161 | { | |
162 | int r; | |
163 | char *argv[] = { BR_STP_PROG, br->dev->name, "stop", NULL }; | |
164 | char *envp[] = { NULL }; | |
76b91c32 | 165 | struct net_bridge_port *p; |
9cde0708 SH |
166 | |
167 | if (br->stp_enabled == BR_USER_STP) { | |
1a9180a2 | 168 | r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC); |
28a16c97 | 169 | br_info(br, "userspace STP stopped, return code %d\n", r); |
9cde0708 SH |
170 | |
171 | /* To start timers on any ports left in blocking */ | |
76b91c32 NA |
172 | mod_timer(&br->hello_timer, jiffies + br->hello_time); |
173 | list_for_each_entry(p, &br->port_list, list) | |
174 | mod_timer(&p->hold_timer, | |
175 | round_jiffies(jiffies + BR_HOLD_TIME)); | |
9cde0708 SH |
176 | spin_lock_bh(&br->lock); |
177 | br_port_state_selection(br); | |
178 | spin_unlock_bh(&br->lock); | |
179 | } | |
180 | ||
181 | br->stp_enabled = BR_NO_STP; | |
182 | } | |
183 | ||
184 | void br_stp_set_enabled(struct net_bridge *br, unsigned long val) | |
185 | { | |
186 | ASSERT_RTNL(); | |
187 | ||
188 | if (val) { | |
189 | if (br->stp_enabled == BR_NO_STP) | |
190 | br_stp_start(br); | |
191 | } else { | |
192 | if (br->stp_enabled != BR_NO_STP) | |
193 | br_stp_stop(br); | |
194 | } | |
195 | } | |
196 | ||
1da177e4 | 197 | /* called under bridge lock */ |
4505a3ef | 198 | void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *addr) |
1da177e4 | 199 | { |
9a7b6ef9 | 200 | /* should be aligned on 2 bytes for ether_addr_equal() */ |
19bb3506 EK |
201 | unsigned short oldaddr_aligned[ETH_ALEN >> 1]; |
202 | unsigned char *oldaddr = (unsigned char *)oldaddr_aligned; | |
1da177e4 LT |
203 | struct net_bridge_port *p; |
204 | int wasroot; | |
205 | ||
206 | wasroot = br_is_root_bridge(br); | |
207 | ||
a4b816d8 TM |
208 | br_fdb_change_mac_address(br, addr); |
209 | ||
1da177e4 LT |
210 | memcpy(oldaddr, br->bridge_id.addr, ETH_ALEN); |
211 | memcpy(br->bridge_id.addr, addr, ETH_ALEN); | |
212 | memcpy(br->dev->dev_addr, addr, ETH_ALEN); | |
213 | ||
214 | list_for_each_entry(p, &br->port_list, list) { | |
9a7b6ef9 | 215 | if (ether_addr_equal(p->designated_bridge.addr, oldaddr)) |
1da177e4 LT |
216 | memcpy(p->designated_bridge.addr, addr, ETH_ALEN); |
217 | ||
9a7b6ef9 | 218 | if (ether_addr_equal(p->designated_root.addr, oldaddr)) |
1da177e4 | 219 | memcpy(p->designated_root.addr, addr, ETH_ALEN); |
1da177e4 LT |
220 | } |
221 | ||
222 | br_configuration_update(br); | |
223 | br_port_state_selection(br); | |
224 | if (br_is_root_bridge(br) && !wasroot) | |
225 | br_become_root_bridge(br); | |
226 | } | |
227 | ||
9a7b6ef9 | 228 | /* should be aligned on 2 bytes for ether_addr_equal() */ |
19bb3506 | 229 | static const unsigned short br_mac_zero_aligned[ETH_ALEN >> 1]; |
1da177e4 LT |
230 | |
231 | /* called under bridge lock */ | |
edf947f1 | 232 | bool br_stp_recalculate_bridge_id(struct net_bridge *br) |
1da177e4 | 233 | { |
19bb3506 EK |
234 | const unsigned char *br_mac_zero = |
235 | (const unsigned char *)br_mac_zero_aligned; | |
1da177e4 LT |
236 | const unsigned char *addr = br_mac_zero; |
237 | struct net_bridge_port *p; | |
238 | ||
92c0574f | 239 | /* user has chosen a value so keep it */ |
b2748267 | 240 | if (br->dev->addr_assign_type == NET_ADDR_SET) |
1459a3cc | 241 | return false; |
92c0574f | 242 | |
1da177e4 LT |
243 | list_for_each_entry(p, &br->port_list, list) { |
244 | if (addr == br_mac_zero || | |
554c9a8e | 245 | memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0) |
1da177e4 LT |
246 | addr = p->dev->dev_addr; |
247 | ||
248 | } | |
249 | ||
9a7b6ef9 | 250 | if (ether_addr_equal(br->bridge_id.addr, addr)) |
edf947f1 | 251 | return false; /* no change */ |
252 | ||
253 | br_stp_change_bridge_id(br, addr); | |
254 | return true; | |
1da177e4 LT |
255 | } |
256 | ||
2dab80a8 | 257 | /* Acquires and releases bridge lock */ |
1da177e4 LT |
258 | void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio) |
259 | { | |
260 | struct net_bridge_port *p; | |
261 | int wasroot; | |
262 | ||
2dab80a8 | 263 | spin_lock_bh(&br->lock); |
1da177e4 LT |
264 | wasroot = br_is_root_bridge(br); |
265 | ||
266 | list_for_each_entry(p, &br->port_list, list) { | |
267 | if (p->state != BR_STATE_DISABLED && | |
268 | br_is_designated_port(p)) { | |
269 | p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF; | |
270 | p->designated_bridge.prio[1] = newprio & 0xFF; | |
271 | } | |
272 | ||
273 | } | |
274 | ||
275 | br->bridge_id.prio[0] = (newprio >> 8) & 0xFF; | |
276 | br->bridge_id.prio[1] = newprio & 0xFF; | |
277 | br_configuration_update(br); | |
278 | br_port_state_selection(br); | |
279 | if (br_is_root_bridge(br) && !wasroot) | |
280 | br_become_root_bridge(br); | |
2dab80a8 | 281 | spin_unlock_bh(&br->lock); |
1da177e4 LT |
282 | } |
283 | ||
284 | /* called under bridge lock */ | |
14f98f25 | 285 | int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio) |
1da177e4 | 286 | { |
14f98f25 | 287 | port_id new_port_id; |
288 | ||
289 | if (newprio > BR_MAX_PORT_PRIORITY) | |
290 | return -ERANGE; | |
1da177e4 | 291 | |
14f98f25 | 292 | new_port_id = br_make_port_id(newprio, p->port_no); |
1da177e4 LT |
293 | if (br_is_designated_port(p)) |
294 | p->designated_port = new_port_id; | |
295 | ||
296 | p->port_id = new_port_id; | |
297 | p->priority = newprio; | |
298 | if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) && | |
299 | p->port_id < p->designated_port) { | |
300 | br_become_designated_port(p); | |
301 | br_port_state_selection(p->br); | |
302 | } | |
14f98f25 | 303 | |
304 | return 0; | |
1da177e4 LT |
305 | } |
306 | ||
307 | /* called under bridge lock */ | |
14f98f25 | 308 | int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost) |
1da177e4 | 309 | { |
14f98f25 | 310 | if (path_cost < BR_MIN_PATH_COST || |
311 | path_cost > BR_MAX_PATH_COST) | |
312 | return -ERANGE; | |
313 | ||
8f3359bd | 314 | p->flags |= BR_ADMIN_COST; |
1da177e4 LT |
315 | p->path_cost = path_cost; |
316 | br_configuration_update(p->br); | |
317 | br_port_state_selection(p->br); | |
14f98f25 | 318 | return 0; |
1da177e4 LT |
319 | } |
320 | ||
321 | ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id) | |
322 | { | |
323 | return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n", | |
324 | id->prio[0], id->prio[1], | |
325 | id->addr[0], id->addr[1], id->addr[2], | |
326 | id->addr[3], id->addr[4], id->addr[5]); | |
327 | } |