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 | * | |
8 | * $Id: br_stp_if.c,v 1.4 2001/04/14 21:14:39 davem Exp $ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/smp_lock.h> | |
6ede2463 | 18 | #include <linux/etherdevice.h> |
11dc1f36 | 19 | #include <linux/rtnetlink.h> |
1da177e4 LT |
20 | |
21 | #include "br_private.h" | |
22 | #include "br_private_stp.h" | |
23 | ||
24 | ||
25 | /* Port id is composed of priority and port number. | |
26 | * NB: least significant bits of priority are dropped to | |
27 | * make room for more ports. | |
28 | */ | |
29 | static inline port_id br_make_port_id(__u8 priority, __u16 port_no) | |
30 | { | |
9d6f229f | 31 | return ((u16)priority << BR_PORT_BITS) |
1da177e4 LT |
32 | | (port_no & ((1<<BR_PORT_BITS)-1)); |
33 | } | |
34 | ||
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); | |
91 | } | |
92 | ||
93 | /* called under bridge lock */ | |
94 | void br_stp_disable_port(struct net_bridge_port *p) | |
95 | { | |
96 | struct net_bridge *br; | |
97 | int wasroot; | |
98 | ||
99 | br = p->br; | |
100 | printk(KERN_INFO "%s: port %i(%s) entering %s state\n", | |
101 | br->dev->name, p->port_no, p->dev->name, "disabled"); | |
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 | ||
109 | del_timer(&p->message_age_timer); | |
110 | del_timer(&p->forward_delay_timer); | |
111 | del_timer(&p->hold_timer); | |
112 | ||
1a620698 SH |
113 | br_fdb_delete_by_port(br, p, 0); |
114 | ||
1da177e4 LT |
115 | br_configuration_update(br); |
116 | ||
117 | br_port_state_selection(br); | |
118 | ||
119 | if (br_is_root_bridge(br) && !wasroot) | |
120 | br_become_root_bridge(br); | |
121 | } | |
122 | ||
9cde0708 SH |
123 | static void br_stp_start(struct net_bridge *br) |
124 | { | |
125 | int r; | |
126 | char *argv[] = { BR_STP_PROG, br->dev->name, "start", NULL }; | |
127 | char *envp[] = { NULL }; | |
128 | ||
129 | r = call_usermodehelper(BR_STP_PROG, argv, envp, 1); | |
130 | if (r == 0) { | |
131 | br->stp_enabled = BR_USER_STP; | |
132 | printk(KERN_INFO "%s: userspace STP started\n", br->dev->name); | |
133 | } else { | |
134 | br->stp_enabled = BR_KERNEL_STP; | |
135 | printk(KERN_INFO "%s: starting userspace STP failed, " | |
136 | "staring kernel STP\n", br->dev->name); | |
137 | ||
138 | /* To start timers on any ports left in blocking */ | |
139 | spin_lock_bh(&br->lock); | |
140 | br_port_state_selection(br); | |
141 | spin_unlock_bh(&br->lock); | |
142 | } | |
143 | } | |
144 | ||
145 | static void br_stp_stop(struct net_bridge *br) | |
146 | { | |
147 | int r; | |
148 | char *argv[] = { BR_STP_PROG, br->dev->name, "stop", NULL }; | |
149 | char *envp[] = { NULL }; | |
150 | ||
151 | if (br->stp_enabled == BR_USER_STP) { | |
152 | r = call_usermodehelper(BR_STP_PROG, argv, envp, 1); | |
153 | printk(KERN_INFO "%s: userspace STP stopped, return code %d\n", | |
154 | br->dev->name, r); | |
155 | ||
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 */ | |
213 | void br_stp_recalculate_bridge_id(struct net_bridge *br) | |
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 | ||
220 | list_for_each_entry(p, &br->port_list, list) { | |
221 | if (addr == br_mac_zero || | |
554c9a8e | 222 | memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0) |
1da177e4 LT |
223 | addr = p->dev->dev_addr; |
224 | ||
225 | } | |
226 | ||
6ede2463 | 227 | if (compare_ether_addr(br->bridge_id.addr, addr)) |
1da177e4 LT |
228 | br_stp_change_bridge_id(br, addr); |
229 | } | |
230 | ||
231 | /* called under bridge lock */ | |
232 | void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio) | |
233 | { | |
234 | struct net_bridge_port *p; | |
235 | int wasroot; | |
236 | ||
237 | wasroot = br_is_root_bridge(br); | |
238 | ||
239 | list_for_each_entry(p, &br->port_list, list) { | |
240 | if (p->state != BR_STATE_DISABLED && | |
241 | br_is_designated_port(p)) { | |
242 | p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF; | |
243 | p->designated_bridge.prio[1] = newprio & 0xFF; | |
244 | } | |
245 | ||
246 | } | |
247 | ||
248 | br->bridge_id.prio[0] = (newprio >> 8) & 0xFF; | |
249 | br->bridge_id.prio[1] = newprio & 0xFF; | |
250 | br_configuration_update(br); | |
251 | br_port_state_selection(br); | |
252 | if (br_is_root_bridge(br) && !wasroot) | |
253 | br_become_root_bridge(br); | |
254 | } | |
255 | ||
256 | /* called under bridge lock */ | |
257 | void br_stp_set_port_priority(struct net_bridge_port *p, u8 newprio) | |
258 | { | |
259 | port_id new_port_id = br_make_port_id(newprio, p->port_no); | |
260 | ||
261 | if (br_is_designated_port(p)) | |
262 | p->designated_port = new_port_id; | |
263 | ||
264 | p->port_id = new_port_id; | |
265 | p->priority = newprio; | |
266 | if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) && | |
267 | p->port_id < p->designated_port) { | |
268 | br_become_designated_port(p); | |
269 | br_port_state_selection(p->br); | |
270 | } | |
271 | } | |
272 | ||
273 | /* called under bridge lock */ | |
274 | void br_stp_set_path_cost(struct net_bridge_port *p, u32 path_cost) | |
275 | { | |
276 | p->path_cost = path_cost; | |
277 | br_configuration_update(p->br); | |
278 | br_port_state_selection(p->br); | |
279 | } | |
280 | ||
281 | ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id) | |
282 | { | |
283 | return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n", | |
284 | id->prio[0], id->prio[1], | |
285 | id->addr[0], id->addr[1], id->addr[2], | |
286 | id->addr[3], id->addr[4], id->addr[5]); | |
287 | } |