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