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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> | |
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. | |
23 | * NB: least significant bits of priority are dropped to | |
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 | ||
32 | /* called under bridge lock */ | |
33 | void br_init_port(struct net_bridge_port *p) | |
34 | { | |
35 | p->port_id = br_make_port_id(p->priority, p->port_no); | |
36 | br_become_designated_port(p); | |
37 | p->state = BR_STATE_BLOCKING; | |
38 | p->topology_change_ack = 0; | |
39 | p->config_pending = 0; | |
1da177e4 LT |
40 | } |
41 | ||
42 | /* called under bridge lock */ | |
43 | void br_stp_enable_bridge(struct net_bridge *br) | |
44 | { | |
45 | struct net_bridge_port *p; | |
46 | ||
47 | spin_lock_bh(&br->lock); | |
48 | mod_timer(&br->hello_timer, jiffies + br->hello_time); | |
49 | mod_timer(&br->gc_timer, jiffies + HZ/10); | |
9d6f229f | 50 | |
1da177e4 LT |
51 | br_config_bpdu_generation(br); |
52 | ||
53 | list_for_each_entry(p, &br->port_list, list) { | |
54 | if ((p->dev->flags & IFF_UP) && netif_carrier_ok(p->dev)) | |
55 | br_stp_enable_port(p); | |
56 | ||
57 | } | |
58 | spin_unlock_bh(&br->lock); | |
59 | } | |
60 | ||
61 | /* NO locks held */ | |
62 | void br_stp_disable_bridge(struct net_bridge *br) | |
63 | { | |
64 | struct net_bridge_port *p; | |
65 | ||
78872ccb | 66 | spin_lock_bh(&br->lock); |
1da177e4 LT |
67 | list_for_each_entry(p, &br->port_list, list) { |
68 | if (p->state != BR_STATE_DISABLED) | |
69 | br_stp_disable_port(p); | |
70 | ||
71 | } | |
72 | ||
73 | br->topology_change = 0; | |
74 | br->topology_change_detected = 0; | |
78872ccb | 75 | spin_unlock_bh(&br->lock); |
1da177e4 LT |
76 | |
77 | del_timer_sync(&br->hello_timer); | |
78 | del_timer_sync(&br->topology_change_timer); | |
79 | del_timer_sync(&br->tcn_timer); | |
80 | del_timer_sync(&br->gc_timer); | |
81 | } | |
82 | ||
83 | /* called under bridge lock */ | |
84 | void br_stp_enable_port(struct net_bridge_port *p) | |
85 | { | |
86 | br_init_port(p); | |
87 | br_port_state_selection(p->br); | |
28a16c97 | 88 | br_log_state(p); |
1da177e4 LT |
89 | } |
90 | ||
91 | /* called under bridge lock */ | |
92 | void br_stp_disable_port(struct net_bridge_port *p) | |
93 | { | |
28a16c97 | 94 | struct net_bridge *br = p->br; |
1da177e4 LT |
95 | int wasroot; |
96 | ||
28a16c97 | 97 | br_log_state(p); |
1da177e4 LT |
98 | |
99 | wasroot = br_is_root_bridge(br); | |
100 | br_become_designated_port(p); | |
101 | p->state = BR_STATE_DISABLED; | |
102 | p->topology_change_ack = 0; | |
103 | p->config_pending = 0; | |
104 | ||
105 | del_timer(&p->message_age_timer); | |
106 | del_timer(&p->forward_delay_timer); | |
107 | del_timer(&p->hold_timer); | |
108 | ||
1a620698 | 109 | br_fdb_delete_by_port(br, p, 0); |
3fe2d7c7 | 110 | br_multicast_disable_port(p); |
1a620698 | 111 | |
1da177e4 LT |
112 | br_configuration_update(br); |
113 | ||
114 | br_port_state_selection(br); | |
115 | ||
116 | if (br_is_root_bridge(br) && !wasroot) | |
117 | br_become_root_bridge(br); | |
118 | } | |
119 | ||
9cde0708 SH |
120 | static void br_stp_start(struct net_bridge *br) |
121 | { | |
122 | int r; | |
123 | char *argv[] = { BR_STP_PROG, br->dev->name, "start", NULL }; | |
124 | char *envp[] = { NULL }; | |
125 | ||
86313c48 | 126 | r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC); |
9cde0708 SH |
127 | if (r == 0) { |
128 | br->stp_enabled = BR_USER_STP; | |
28a16c97 | 129 | br_debug(br, "userspace STP started\n"); |
9cde0708 SH |
130 | } else { |
131 | br->stp_enabled = BR_KERNEL_STP; | |
28a16c97 | 132 | br_debug(br, "using kernel STP\n"); |
9cde0708 SH |
133 | |
134 | /* To start timers on any ports left in blocking */ | |
135 | spin_lock_bh(&br->lock); | |
136 | br_port_state_selection(br); | |
137 | spin_unlock_bh(&br->lock); | |
138 | } | |
139 | } | |
140 | ||
141 | static void br_stp_stop(struct net_bridge *br) | |
142 | { | |
143 | int r; | |
144 | char *argv[] = { BR_STP_PROG, br->dev->name, "stop", NULL }; | |
145 | char *envp[] = { NULL }; | |
146 | ||
147 | if (br->stp_enabled == BR_USER_STP) { | |
1a9180a2 | 148 | r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC); |
28a16c97 | 149 | br_info(br, "userspace STP stopped, return code %d\n", r); |
9cde0708 SH |
150 | |
151 | /* To start timers on any ports left in blocking */ | |
152 | spin_lock_bh(&br->lock); | |
153 | br_port_state_selection(br); | |
154 | spin_unlock_bh(&br->lock); | |
155 | } | |
156 | ||
157 | br->stp_enabled = BR_NO_STP; | |
158 | } | |
159 | ||
160 | void br_stp_set_enabled(struct net_bridge *br, unsigned long val) | |
161 | { | |
162 | ASSERT_RTNL(); | |
163 | ||
164 | if (val) { | |
165 | if (br->stp_enabled == BR_NO_STP) | |
166 | br_stp_start(br); | |
167 | } else { | |
168 | if (br->stp_enabled != BR_NO_STP) | |
169 | br_stp_stop(br); | |
170 | } | |
171 | } | |
172 | ||
1da177e4 | 173 | /* called under bridge lock */ |
4505a3ef | 174 | void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *addr) |
1da177e4 | 175 | { |
19bb3506 EK |
176 | /* should be aligned on 2 bytes for compare_ether_addr() */ |
177 | unsigned short oldaddr_aligned[ETH_ALEN >> 1]; | |
178 | unsigned char *oldaddr = (unsigned char *)oldaddr_aligned; | |
1da177e4 LT |
179 | struct net_bridge_port *p; |
180 | int wasroot; | |
181 | ||
182 | wasroot = br_is_root_bridge(br); | |
183 | ||
184 | memcpy(oldaddr, br->bridge_id.addr, ETH_ALEN); | |
185 | memcpy(br->bridge_id.addr, addr, ETH_ALEN); | |
186 | memcpy(br->dev->dev_addr, addr, ETH_ALEN); | |
187 | ||
188 | list_for_each_entry(p, &br->port_list, list) { | |
6ede2463 | 189 | if (!compare_ether_addr(p->designated_bridge.addr, oldaddr)) |
1da177e4 LT |
190 | memcpy(p->designated_bridge.addr, addr, ETH_ALEN); |
191 | ||
6ede2463 | 192 | if (!compare_ether_addr(p->designated_root.addr, oldaddr)) |
1da177e4 LT |
193 | memcpy(p->designated_root.addr, addr, ETH_ALEN); |
194 | ||
195 | } | |
196 | ||
197 | br_configuration_update(br); | |
198 | br_port_state_selection(br); | |
199 | if (br_is_root_bridge(br) && !wasroot) | |
200 | br_become_root_bridge(br); | |
201 | } | |
202 | ||
19bb3506 EK |
203 | /* should be aligned on 2 bytes for compare_ether_addr() */ |
204 | static const unsigned short br_mac_zero_aligned[ETH_ALEN >> 1]; | |
1da177e4 LT |
205 | |
206 | /* called under bridge lock */ | |
207 | void br_stp_recalculate_bridge_id(struct net_bridge *br) | |
208 | { | |
19bb3506 EK |
209 | const unsigned char *br_mac_zero = |
210 | (const unsigned char *)br_mac_zero_aligned; | |
1da177e4 LT |
211 | const unsigned char *addr = br_mac_zero; |
212 | struct net_bridge_port *p; | |
213 | ||
92c0574f SH |
214 | /* user has chosen a value so keep it */ |
215 | if (br->flags & BR_SET_MAC_ADDR) | |
216 | return; | |
217 | ||
1da177e4 LT |
218 | list_for_each_entry(p, &br->port_list, list) { |
219 | if (addr == br_mac_zero || | |
554c9a8e | 220 | memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0) |
1da177e4 LT |
221 | addr = p->dev->dev_addr; |
222 | ||
223 | } | |
224 | ||
6ede2463 | 225 | if (compare_ether_addr(br->bridge_id.addr, addr)) |
1da177e4 LT |
226 | br_stp_change_bridge_id(br, addr); |
227 | } | |
228 | ||
229 | /* called under bridge lock */ | |
230 | void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio) | |
231 | { | |
232 | struct net_bridge_port *p; | |
233 | int wasroot; | |
234 | ||
235 | wasroot = br_is_root_bridge(br); | |
236 | ||
237 | list_for_each_entry(p, &br->port_list, list) { | |
238 | if (p->state != BR_STATE_DISABLED && | |
239 | br_is_designated_port(p)) { | |
240 | p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF; | |
241 | p->designated_bridge.prio[1] = newprio & 0xFF; | |
242 | } | |
243 | ||
244 | } | |
245 | ||
246 | br->bridge_id.prio[0] = (newprio >> 8) & 0xFF; | |
247 | br->bridge_id.prio[1] = newprio & 0xFF; | |
248 | br_configuration_update(br); | |
249 | br_port_state_selection(br); | |
250 | if (br_is_root_bridge(br) && !wasroot) | |
251 | br_become_root_bridge(br); | |
252 | } | |
253 | ||
254 | /* called under bridge lock */ | |
255 | void br_stp_set_port_priority(struct net_bridge_port *p, u8 newprio) | |
256 | { | |
257 | port_id new_port_id = br_make_port_id(newprio, p->port_no); | |
258 | ||
259 | if (br_is_designated_port(p)) | |
260 | p->designated_port = new_port_id; | |
261 | ||
262 | p->port_id = new_port_id; | |
263 | p->priority = newprio; | |
264 | if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) && | |
265 | p->port_id < p->designated_port) { | |
266 | br_become_designated_port(p); | |
267 | br_port_state_selection(p->br); | |
268 | } | |
269 | } | |
270 | ||
271 | /* called under bridge lock */ | |
272 | void br_stp_set_path_cost(struct net_bridge_port *p, u32 path_cost) | |
273 | { | |
274 | p->path_cost = path_cost; | |
275 | br_configuration_update(p->br); | |
276 | br_port_state_selection(p->br); | |
277 | } | |
278 | ||
279 | ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id) | |
280 | { | |
281 | return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n", | |
282 | id->prio[0], id->prio[1], | |
283 | id->addr[0], id->addr[1], id->addr[2], | |
284 | id->addr[3], id->addr[4], id->addr[5]); | |
285 | } |