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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); | |
40 | p->state = BR_STATE_BLOCKING; | |
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) { | |
57 | if ((p->dev->flags & IFF_UP) && netif_carrier_ok(p->dev)) | |
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 | ||
28a16c97 | 101 | br_log_state(p); |
1da177e4 LT |
102 | |
103 | wasroot = br_is_root_bridge(br); | |
104 | br_become_designated_port(p); | |
105 | p->state = BR_STATE_DISABLED; | |
106 | p->topology_change_ack = 0; | |
107 | p->config_pending = 0; | |
108 | ||
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 | ||
1a620698 | 115 | br_fdb_delete_by_port(br, p, 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 }; | |
131 | ||
86313c48 | 132 | r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC); |
9cde0708 SH |
133 | if (r == 0) { |
134 | br->stp_enabled = BR_USER_STP; | |
28a16c97 | 135 | br_debug(br, "userspace STP started\n"); |
9cde0708 SH |
136 | } else { |
137 | br->stp_enabled = BR_KERNEL_STP; | |
28a16c97 | 138 | br_debug(br, "using kernel STP\n"); |
9cde0708 SH |
139 | |
140 | /* To start timers on any ports left in blocking */ | |
141 | spin_lock_bh(&br->lock); | |
142 | br_port_state_selection(br); | |
143 | spin_unlock_bh(&br->lock); | |
144 | } | |
145 | } | |
146 | ||
147 | static void br_stp_stop(struct net_bridge *br) | |
148 | { | |
149 | int r; | |
150 | char *argv[] = { BR_STP_PROG, br->dev->name, "stop", NULL }; | |
151 | char *envp[] = { NULL }; | |
152 | ||
153 | if (br->stp_enabled == BR_USER_STP) { | |
1a9180a2 | 154 | r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC); |
28a16c97 | 155 | br_info(br, "userspace STP stopped, return code %d\n", r); |
9cde0708 SH |
156 | |
157 | /* To start timers on any ports left in blocking */ | |
158 | spin_lock_bh(&br->lock); | |
159 | br_port_state_selection(br); | |
160 | spin_unlock_bh(&br->lock); | |
161 | } | |
162 | ||
163 | br->stp_enabled = BR_NO_STP; | |
164 | } | |
165 | ||
166 | void br_stp_set_enabled(struct net_bridge *br, unsigned long val) | |
167 | { | |
168 | ASSERT_RTNL(); | |
169 | ||
170 | if (val) { | |
171 | if (br->stp_enabled == BR_NO_STP) | |
172 | br_stp_start(br); | |
173 | } else { | |
174 | if (br->stp_enabled != BR_NO_STP) | |
175 | br_stp_stop(br); | |
176 | } | |
177 | } | |
178 | ||
1da177e4 | 179 | /* called under bridge lock */ |
4505a3ef | 180 | void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *addr) |
1da177e4 | 181 | { |
19bb3506 EK |
182 | /* should be aligned on 2 bytes for compare_ether_addr() */ |
183 | unsigned short oldaddr_aligned[ETH_ALEN >> 1]; | |
184 | unsigned char *oldaddr = (unsigned char *)oldaddr_aligned; | |
1da177e4 LT |
185 | struct net_bridge_port *p; |
186 | int wasroot; | |
187 | ||
188 | wasroot = br_is_root_bridge(br); | |
189 | ||
190 | memcpy(oldaddr, br->bridge_id.addr, ETH_ALEN); | |
191 | memcpy(br->bridge_id.addr, addr, ETH_ALEN); | |
192 | memcpy(br->dev->dev_addr, addr, ETH_ALEN); | |
193 | ||
194 | list_for_each_entry(p, &br->port_list, list) { | |
6ede2463 | 195 | if (!compare_ether_addr(p->designated_bridge.addr, oldaddr)) |
1da177e4 LT |
196 | memcpy(p->designated_bridge.addr, addr, ETH_ALEN); |
197 | ||
6ede2463 | 198 | if (!compare_ether_addr(p->designated_root.addr, oldaddr)) |
1da177e4 LT |
199 | memcpy(p->designated_root.addr, addr, ETH_ALEN); |
200 | ||
201 | } | |
202 | ||
203 | br_configuration_update(br); | |
204 | br_port_state_selection(br); | |
205 | if (br_is_root_bridge(br) && !wasroot) | |
206 | br_become_root_bridge(br); | |
207 | } | |
208 | ||
19bb3506 EK |
209 | /* should be aligned on 2 bytes for compare_ether_addr() */ |
210 | static const unsigned short br_mac_zero_aligned[ETH_ALEN >> 1]; | |
1da177e4 LT |
211 | |
212 | /* called under bridge lock */ | |
edf947f1 | 213 | bool br_stp_recalculate_bridge_id(struct net_bridge *br) |
1da177e4 | 214 | { |
19bb3506 EK |
215 | const unsigned char *br_mac_zero = |
216 | (const unsigned char *)br_mac_zero_aligned; | |
1da177e4 LT |
217 | const unsigned char *addr = br_mac_zero; |
218 | struct net_bridge_port *p; | |
219 | ||
92c0574f SH |
220 | /* user has chosen a value so keep it */ |
221 | if (br->flags & BR_SET_MAC_ADDR) | |
1459a3cc | 222 | return false; |
92c0574f | 223 | |
1da177e4 LT |
224 | list_for_each_entry(p, &br->port_list, list) { |
225 | if (addr == br_mac_zero || | |
554c9a8e | 226 | memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0) |
1da177e4 LT |
227 | addr = p->dev->dev_addr; |
228 | ||
229 | } | |
230 | ||
edf947f1 | 231 | if (compare_ether_addr(br->bridge_id.addr, addr) == 0) |
232 | return false; /* no change */ | |
233 | ||
234 | br_stp_change_bridge_id(br, addr); | |
235 | return true; | |
1da177e4 LT |
236 | } |
237 | ||
238 | /* called under bridge lock */ | |
239 | void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio) | |
240 | { | |
241 | struct net_bridge_port *p; | |
242 | int wasroot; | |
243 | ||
244 | wasroot = br_is_root_bridge(br); | |
245 | ||
246 | list_for_each_entry(p, &br->port_list, list) { | |
247 | if (p->state != BR_STATE_DISABLED && | |
248 | br_is_designated_port(p)) { | |
249 | p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF; | |
250 | p->designated_bridge.prio[1] = newprio & 0xFF; | |
251 | } | |
252 | ||
253 | } | |
254 | ||
255 | br->bridge_id.prio[0] = (newprio >> 8) & 0xFF; | |
256 | br->bridge_id.prio[1] = newprio & 0xFF; | |
257 | br_configuration_update(br); | |
258 | br_port_state_selection(br); | |
259 | if (br_is_root_bridge(br) && !wasroot) | |
260 | br_become_root_bridge(br); | |
261 | } | |
262 | ||
263 | /* called under bridge lock */ | |
14f98f25 | 264 | int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio) |
1da177e4 | 265 | { |
14f98f25 | 266 | port_id new_port_id; |
267 | ||
268 | if (newprio > BR_MAX_PORT_PRIORITY) | |
269 | return -ERANGE; | |
1da177e4 | 270 | |
14f98f25 | 271 | new_port_id = br_make_port_id(newprio, p->port_no); |
1da177e4 LT |
272 | if (br_is_designated_port(p)) |
273 | p->designated_port = new_port_id; | |
274 | ||
275 | p->port_id = new_port_id; | |
276 | p->priority = newprio; | |
277 | if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) && | |
278 | p->port_id < p->designated_port) { | |
279 | br_become_designated_port(p); | |
280 | br_port_state_selection(p->br); | |
281 | } | |
14f98f25 | 282 | |
283 | return 0; | |
1da177e4 LT |
284 | } |
285 | ||
286 | /* called under bridge lock */ | |
14f98f25 | 287 | int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost) |
1da177e4 | 288 | { |
14f98f25 | 289 | if (path_cost < BR_MIN_PATH_COST || |
290 | path_cost > BR_MAX_PATH_COST) | |
291 | return -ERANGE; | |
292 | ||
1da177e4 LT |
293 | p->path_cost = path_cost; |
294 | br_configuration_update(p->br); | |
295 | br_port_state_selection(p->br); | |
14f98f25 | 296 | return 0; |
1da177e4 LT |
297 | } |
298 | ||
299 | ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id) | |
300 | { | |
301 | return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n", | |
302 | id->prio[0], id->prio[1], | |
303 | id->addr[0], id->addr[1], id->addr[2], | |
304 | id->addr[3], id->addr[4], id->addr[5]); | |
305 | } |