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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 | * | |
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> | |
6ede2463 | 17 | #include <linux/etherdevice.h> |
11dc1f36 | 18 | #include <linux/rtnetlink.h> |
1da177e4 LT |
19 | |
20 | #include "br_private.h" | |
21 | #include "br_private_stp.h" | |
22 | ||
23 | ||
24 | /* Port id is composed of priority and port number. | |
25 | * NB: least significant bits of priority are dropped to | |
26 | * make room for more ports. | |
27 | */ | |
28 | static inline port_id br_make_port_id(__u8 priority, __u16 port_no) | |
29 | { | |
9d6f229f | 30 | return ((u16)priority << BR_PORT_BITS) |
1da177e4 LT |
31 | | (port_no & ((1<<BR_PORT_BITS)-1)); |
32 | } | |
33 | ||
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); | |
90 | } | |
91 | ||
92 | /* called under bridge lock */ | |
93 | void br_stp_disable_port(struct net_bridge_port *p) | |
94 | { | |
95 | struct net_bridge *br; | |
96 | int wasroot; | |
97 | ||
98 | br = p->br; | |
99 | printk(KERN_INFO "%s: port %i(%s) entering %s state\n", | |
100 | br->dev->name, p->port_no, p->dev->name, "disabled"); | |
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 | ||
108 | del_timer(&p->message_age_timer); | |
109 | del_timer(&p->forward_delay_timer); | |
110 | del_timer(&p->hold_timer); | |
111 | ||
1a620698 SH |
112 | br_fdb_delete_by_port(br, p, 0); |
113 | ||
1da177e4 LT |
114 | br_configuration_update(br); |
115 | ||
116 | br_port_state_selection(br); | |
117 | ||
118 | if (br_is_root_bridge(br) && !wasroot) | |
119 | br_become_root_bridge(br); | |
120 | } | |
121 | ||
9cde0708 SH |
122 | static void br_stp_start(struct net_bridge *br) |
123 | { | |
124 | int r; | |
125 | char *argv[] = { BR_STP_PROG, br->dev->name, "start", NULL }; | |
126 | char *envp[] = { NULL }; | |
127 | ||
128 | r = call_usermodehelper(BR_STP_PROG, argv, envp, 1); | |
129 | if (r == 0) { | |
130 | br->stp_enabled = BR_USER_STP; | |
131 | printk(KERN_INFO "%s: userspace STP started\n", br->dev->name); | |
132 | } else { | |
133 | br->stp_enabled = BR_KERNEL_STP; | |
134 | printk(KERN_INFO "%s: starting userspace STP failed, " | |
135 | "staring kernel STP\n", br->dev->name); | |
136 | ||
137 | /* To start timers on any ports left in blocking */ | |
138 | spin_lock_bh(&br->lock); | |
139 | br_port_state_selection(br); | |
140 | spin_unlock_bh(&br->lock); | |
141 | } | |
142 | } | |
143 | ||
144 | static void br_stp_stop(struct net_bridge *br) | |
145 | { | |
146 | int r; | |
147 | char *argv[] = { BR_STP_PROG, br->dev->name, "stop", NULL }; | |
148 | char *envp[] = { NULL }; | |
149 | ||
150 | if (br->stp_enabled == BR_USER_STP) { | |
151 | r = call_usermodehelper(BR_STP_PROG, argv, envp, 1); | |
152 | printk(KERN_INFO "%s: userspace STP stopped, return code %d\n", | |
153 | br->dev->name, r); | |
154 | ||
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 */ | |
212 | void br_stp_recalculate_bridge_id(struct net_bridge *br) | |
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 | ||
219 | list_for_each_entry(p, &br->port_list, list) { | |
220 | if (addr == br_mac_zero || | |
554c9a8e | 221 | memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0) |
1da177e4 LT |
222 | addr = p->dev->dev_addr; |
223 | ||
224 | } | |
225 | ||
6ede2463 | 226 | if (compare_ether_addr(br->bridge_id.addr, addr)) |
1da177e4 LT |
227 | br_stp_change_bridge_id(br, addr); |
228 | } | |
229 | ||
230 | /* called under bridge lock */ | |
231 | void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio) | |
232 | { | |
233 | struct net_bridge_port *p; | |
234 | int wasroot; | |
235 | ||
236 | wasroot = br_is_root_bridge(br); | |
237 | ||
238 | list_for_each_entry(p, &br->port_list, list) { | |
239 | if (p->state != BR_STATE_DISABLED && | |
240 | br_is_designated_port(p)) { | |
241 | p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF; | |
242 | p->designated_bridge.prio[1] = newprio & 0xFF; | |
243 | } | |
244 | ||
245 | } | |
246 | ||
247 | br->bridge_id.prio[0] = (newprio >> 8) & 0xFF; | |
248 | br->bridge_id.prio[1] = newprio & 0xFF; | |
249 | br_configuration_update(br); | |
250 | br_port_state_selection(br); | |
251 | if (br_is_root_bridge(br) && !wasroot) | |
252 | br_become_root_bridge(br); | |
253 | } | |
254 | ||
255 | /* called under bridge lock */ | |
256 | void br_stp_set_port_priority(struct net_bridge_port *p, u8 newprio) | |
257 | { | |
258 | port_id new_port_id = br_make_port_id(newprio, p->port_no); | |
259 | ||
260 | if (br_is_designated_port(p)) | |
261 | p->designated_port = new_port_id; | |
262 | ||
263 | p->port_id = new_port_id; | |
264 | p->priority = newprio; | |
265 | if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) && | |
266 | p->port_id < p->designated_port) { | |
267 | br_become_designated_port(p); | |
268 | br_port_state_selection(p->br); | |
269 | } | |
270 | } | |
271 | ||
272 | /* called under bridge lock */ | |
273 | void br_stp_set_path_cost(struct net_bridge_port *p, u32 path_cost) | |
274 | { | |
275 | p->path_cost = path_cost; | |
276 | br_configuration_update(p->br); | |
277 | br_port_state_selection(p->br); | |
278 | } | |
279 | ||
280 | ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id) | |
281 | { | |
282 | return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n", | |
283 | id->prio[0], id->prio[1], | |
284 | id->addr[0], id->addr[1], id->addr[2], | |
285 | id->addr[3], id->addr[4], id->addr[5]); | |
286 | } |