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> | |
6ede2463 | 15 | #include <linux/etherdevice.h> |
11dc1f36 | 16 | #include <linux/rtnetlink.h> |
1da177e4 LT |
17 | |
18 | #include "br_private.h" | |
19 | #include "br_private_stp.h" | |
20 | ||
21 | ||
22 | /* Port id is composed of priority and port number. | |
14f98f25 | 23 | * NB: some bits of priority are dropped to |
1da177e4 LT |
24 | * make room for more ports. |
25 | */ | |
26 | static inline port_id br_make_port_id(__u8 priority, __u16 port_no) | |
27 | { | |
9d6f229f | 28 | return ((u16)priority << BR_PORT_BITS) |
1da177e4 LT |
29 | | (port_no & ((1<<BR_PORT_BITS)-1)); |
30 | } | |
31 | ||
14f98f25 | 32 | #define BR_MAX_PORT_PRIORITY ((u16)~0 >> BR_PORT_BITS) |
33 | ||
1da177e4 LT |
34 | /* called under bridge lock */ |
35 | void br_init_port(struct net_bridge_port *p) | |
36 | { | |
37 | p->port_id = br_make_port_id(p->priority, p->port_no); | |
38 | br_become_designated_port(p); | |
39 | p->state = BR_STATE_BLOCKING; | |
40 | p->topology_change_ack = 0; | |
41 | p->config_pending = 0; | |
1da177e4 LT |
42 | } |
43 | ||
44 | /* called under bridge lock */ | |
45 | void br_stp_enable_bridge(struct net_bridge *br) | |
46 | { | |
47 | struct net_bridge_port *p; | |
48 | ||
49 | spin_lock_bh(&br->lock); | |
50 | mod_timer(&br->hello_timer, jiffies + br->hello_time); | |
51 | mod_timer(&br->gc_timer, jiffies + HZ/10); | |
9d6f229f | 52 | |
1da177e4 LT |
53 | br_config_bpdu_generation(br); |
54 | ||
55 | list_for_each_entry(p, &br->port_list, list) { | |
56 | if ((p->dev->flags & IFF_UP) && netif_carrier_ok(p->dev)) | |
57 | br_stp_enable_port(p); | |
58 | ||
59 | } | |
60 | spin_unlock_bh(&br->lock); | |
61 | } | |
62 | ||
63 | /* NO locks held */ | |
64 | void br_stp_disable_bridge(struct net_bridge *br) | |
65 | { | |
66 | struct net_bridge_port *p; | |
67 | ||
78872ccb | 68 | spin_lock_bh(&br->lock); |
1da177e4 LT |
69 | list_for_each_entry(p, &br->port_list, list) { |
70 | if (p->state != BR_STATE_DISABLED) | |
71 | br_stp_disable_port(p); | |
72 | ||
73 | } | |
74 | ||
75 | br->topology_change = 0; | |
76 | br->topology_change_detected = 0; | |
78872ccb | 77 | spin_unlock_bh(&br->lock); |
1da177e4 LT |
78 | |
79 | del_timer_sync(&br->hello_timer); | |
80 | del_timer_sync(&br->topology_change_timer); | |
81 | del_timer_sync(&br->tcn_timer); | |
82 | del_timer_sync(&br->gc_timer); | |
83 | } | |
84 | ||
85 | /* called under bridge lock */ | |
86 | void br_stp_enable_port(struct net_bridge_port *p) | |
87 | { | |
88 | br_init_port(p); | |
89 | br_port_state_selection(p->br); | |
28a16c97 | 90 | br_log_state(p); |
4ecb961c | 91 | br_ifinfo_notify(RTM_NEWLINK, p); |
1da177e4 LT |
92 | } |
93 | ||
94 | /* called under bridge lock */ | |
95 | void br_stp_disable_port(struct net_bridge_port *p) | |
96 | { | |
28a16c97 | 97 | struct net_bridge *br = p->br; |
1da177e4 LT |
98 | int wasroot; |
99 | ||
28a16c97 | 100 | br_log_state(p); |
1da177e4 LT |
101 | |
102 | wasroot = br_is_root_bridge(br); | |
103 | br_become_designated_port(p); | |
104 | p->state = BR_STATE_DISABLED; | |
105 | p->topology_change_ack = 0; | |
106 | p->config_pending = 0; | |
107 | ||
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 | ||
1a620698 | 114 | br_fdb_delete_by_port(br, p, 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); |
9cde0708 SH |
132 | if (r == 0) { |
133 | br->stp_enabled = BR_USER_STP; | |
28a16c97 | 134 | br_debug(br, "userspace STP started\n"); |
9cde0708 SH |
135 | } else { |
136 | br->stp_enabled = BR_KERNEL_STP; | |
28a16c97 | 137 | br_debug(br, "using kernel STP\n"); |
9cde0708 SH |
138 | |
139 | /* To start timers on any ports left in blocking */ | |
140 | spin_lock_bh(&br->lock); | |
141 | br_port_state_selection(br); | |
142 | spin_unlock_bh(&br->lock); | |
143 | } | |
144 | } | |
145 | ||
146 | static void br_stp_stop(struct net_bridge *br) | |
147 | { | |
148 | int r; | |
149 | char *argv[] = { BR_STP_PROG, br->dev->name, "stop", NULL }; | |
150 | char *envp[] = { NULL }; | |
151 | ||
152 | if (br->stp_enabled == BR_USER_STP) { | |
1a9180a2 | 153 | r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC); |
28a16c97 | 154 | br_info(br, "userspace STP stopped, return code %d\n", r); |
9cde0708 SH |
155 | |
156 | /* To start timers on any ports left in blocking */ | |
157 | spin_lock_bh(&br->lock); | |
158 | br_port_state_selection(br); | |
159 | spin_unlock_bh(&br->lock); | |
160 | } | |
161 | ||
162 | br->stp_enabled = BR_NO_STP; | |
163 | } | |
164 | ||
165 | void br_stp_set_enabled(struct net_bridge *br, unsigned long val) | |
166 | { | |
167 | ASSERT_RTNL(); | |
168 | ||
169 | if (val) { | |
170 | if (br->stp_enabled == BR_NO_STP) | |
171 | br_stp_start(br); | |
172 | } else { | |
173 | if (br->stp_enabled != BR_NO_STP) | |
174 | br_stp_stop(br); | |
175 | } | |
176 | } | |
177 | ||
1da177e4 | 178 | /* called under bridge lock */ |
4505a3ef | 179 | void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *addr) |
1da177e4 | 180 | { |
19bb3506 EK |
181 | /* should be aligned on 2 bytes for compare_ether_addr() */ |
182 | unsigned short oldaddr_aligned[ETH_ALEN >> 1]; | |
183 | unsigned char *oldaddr = (unsigned char *)oldaddr_aligned; | |
1da177e4 LT |
184 | struct net_bridge_port *p; |
185 | int wasroot; | |
186 | ||
187 | wasroot = br_is_root_bridge(br); | |
188 | ||
189 | memcpy(oldaddr, br->bridge_id.addr, ETH_ALEN); | |
190 | memcpy(br->bridge_id.addr, addr, ETH_ALEN); | |
191 | memcpy(br->dev->dev_addr, addr, ETH_ALEN); | |
192 | ||
193 | list_for_each_entry(p, &br->port_list, list) { | |
6ede2463 | 194 | if (!compare_ether_addr(p->designated_bridge.addr, oldaddr)) |
1da177e4 LT |
195 | memcpy(p->designated_bridge.addr, addr, ETH_ALEN); |
196 | ||
6ede2463 | 197 | if (!compare_ether_addr(p->designated_root.addr, oldaddr)) |
1da177e4 LT |
198 | memcpy(p->designated_root.addr, addr, ETH_ALEN); |
199 | ||
200 | } | |
201 | ||
202 | br_configuration_update(br); | |
203 | br_port_state_selection(br); | |
204 | if (br_is_root_bridge(br) && !wasroot) | |
205 | br_become_root_bridge(br); | |
206 | } | |
207 | ||
19bb3506 EK |
208 | /* should be aligned on 2 bytes for compare_ether_addr() */ |
209 | static const unsigned short br_mac_zero_aligned[ETH_ALEN >> 1]; | |
1da177e4 LT |
210 | |
211 | /* called under bridge lock */ | |
edf947f1 | 212 | bool br_stp_recalculate_bridge_id(struct net_bridge *br) |
1da177e4 | 213 | { |
19bb3506 EK |
214 | const unsigned char *br_mac_zero = |
215 | (const unsigned char *)br_mac_zero_aligned; | |
1da177e4 LT |
216 | const unsigned char *addr = br_mac_zero; |
217 | struct net_bridge_port *p; | |
218 | ||
92c0574f SH |
219 | /* user has chosen a value so keep it */ |
220 | if (br->flags & BR_SET_MAC_ADDR) | |
1459a3cc | 221 | return false; |
92c0574f | 222 | |
1da177e4 LT |
223 | list_for_each_entry(p, &br->port_list, list) { |
224 | if (addr == br_mac_zero || | |
554c9a8e | 225 | memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0) |
1da177e4 LT |
226 | addr = p->dev->dev_addr; |
227 | ||
228 | } | |
229 | ||
edf947f1 | 230 | if (compare_ether_addr(br->bridge_id.addr, addr) == 0) |
231 | return false; /* no change */ | |
232 | ||
233 | br_stp_change_bridge_id(br, addr); | |
234 | return true; | |
1da177e4 LT |
235 | } |
236 | ||
237 | /* called under bridge lock */ | |
238 | void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio) | |
239 | { | |
240 | struct net_bridge_port *p; | |
241 | int wasroot; | |
242 | ||
243 | wasroot = br_is_root_bridge(br); | |
244 | ||
245 | list_for_each_entry(p, &br->port_list, list) { | |
246 | if (p->state != BR_STATE_DISABLED && | |
247 | br_is_designated_port(p)) { | |
248 | p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF; | |
249 | p->designated_bridge.prio[1] = newprio & 0xFF; | |
250 | } | |
251 | ||
252 | } | |
253 | ||
254 | br->bridge_id.prio[0] = (newprio >> 8) & 0xFF; | |
255 | br->bridge_id.prio[1] = newprio & 0xFF; | |
256 | br_configuration_update(br); | |
257 | br_port_state_selection(br); | |
258 | if (br_is_root_bridge(br) && !wasroot) | |
259 | br_become_root_bridge(br); | |
260 | } | |
261 | ||
262 | /* called under bridge lock */ | |
14f98f25 | 263 | int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio) |
1da177e4 | 264 | { |
14f98f25 | 265 | port_id new_port_id; |
266 | ||
267 | if (newprio > BR_MAX_PORT_PRIORITY) | |
268 | return -ERANGE; | |
1da177e4 | 269 | |
14f98f25 | 270 | new_port_id = br_make_port_id(newprio, p->port_no); |
1da177e4 LT |
271 | if (br_is_designated_port(p)) |
272 | p->designated_port = new_port_id; | |
273 | ||
274 | p->port_id = new_port_id; | |
275 | p->priority = newprio; | |
276 | if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) && | |
277 | p->port_id < p->designated_port) { | |
278 | br_become_designated_port(p); | |
279 | br_port_state_selection(p->br); | |
280 | } | |
14f98f25 | 281 | |
282 | return 0; | |
1da177e4 LT |
283 | } |
284 | ||
285 | /* called under bridge lock */ | |
14f98f25 | 286 | int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost) |
1da177e4 | 287 | { |
14f98f25 | 288 | if (path_cost < BR_MIN_PATH_COST || |
289 | path_cost > BR_MAX_PATH_COST) | |
290 | return -ERANGE; | |
291 | ||
1da177e4 LT |
292 | p->path_cost = path_cost; |
293 | br_configuration_update(p->br); | |
294 | br_port_state_selection(p->br); | |
14f98f25 | 295 | return 0; |
1da177e4 LT |
296 | } |
297 | ||
298 | ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id) | |
299 | { | |
300 | return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n", | |
301 | id->prio[0], id->prio[1], | |
302 | id->addr[0], id->addr[1], id->addr[2], | |
303 | id->addr[3], id->addr[4], id->addr[5]); | |
304 | } |