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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> | |
17 | #include <linux/smp_lock.h> | |
6ede2463 | 18 | #include <linux/etherdevice.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 | { | |
30 | return ((u16)priority << BR_PORT_BITS) | |
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; | |
42 | ||
43 | br_stp_port_timer_init(p); | |
44 | } | |
45 | ||
46 | /* called under bridge lock */ | |
47 | void br_stp_enable_bridge(struct net_bridge *br) | |
48 | { | |
49 | struct net_bridge_port *p; | |
50 | ||
51 | spin_lock_bh(&br->lock); | |
52 | mod_timer(&br->hello_timer, jiffies + br->hello_time); | |
53 | mod_timer(&br->gc_timer, jiffies + HZ/10); | |
54 | ||
55 | br_config_bpdu_generation(br); | |
56 | ||
57 | list_for_each_entry(p, &br->port_list, list) { | |
58 | if ((p->dev->flags & IFF_UP) && netif_carrier_ok(p->dev)) | |
59 | br_stp_enable_port(p); | |
60 | ||
61 | } | |
62 | spin_unlock_bh(&br->lock); | |
63 | } | |
64 | ||
65 | /* NO locks held */ | |
66 | void br_stp_disable_bridge(struct net_bridge *br) | |
67 | { | |
68 | struct net_bridge_port *p; | |
69 | ||
70 | spin_lock(&br->lock); | |
71 | list_for_each_entry(p, &br->port_list, list) { | |
72 | if (p->state != BR_STATE_DISABLED) | |
73 | br_stp_disable_port(p); | |
74 | ||
75 | } | |
76 | ||
77 | br->topology_change = 0; | |
78 | br->topology_change_detected = 0; | |
79 | spin_unlock(&br->lock); | |
80 | ||
81 | del_timer_sync(&br->hello_timer); | |
82 | del_timer_sync(&br->topology_change_timer); | |
83 | del_timer_sync(&br->tcn_timer); | |
84 | del_timer_sync(&br->gc_timer); | |
85 | } | |
86 | ||
87 | /* called under bridge lock */ | |
88 | void br_stp_enable_port(struct net_bridge_port *p) | |
89 | { | |
90 | br_init_port(p); | |
91 | br_port_state_selection(p->br); | |
92 | } | |
93 | ||
94 | /* called under bridge lock */ | |
95 | void br_stp_disable_port(struct net_bridge_port *p) | |
96 | { | |
97 | struct net_bridge *br; | |
98 | int wasroot; | |
99 | ||
100 | br = p->br; | |
101 | printk(KERN_INFO "%s: port %i(%s) entering %s state\n", | |
102 | br->dev->name, p->port_no, p->dev->name, "disabled"); | |
103 | ||
104 | wasroot = br_is_root_bridge(br); | |
105 | br_become_designated_port(p); | |
106 | p->state = BR_STATE_DISABLED; | |
107 | p->topology_change_ack = 0; | |
108 | p->config_pending = 0; | |
109 | ||
110 | del_timer(&p->message_age_timer); | |
111 | del_timer(&p->forward_delay_timer); | |
112 | del_timer(&p->hold_timer); | |
113 | ||
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 | ||
122 | /* called under bridge lock */ | |
123 | static void br_stp_change_bridge_id(struct net_bridge *br, | |
124 | const unsigned char *addr) | |
125 | { | |
126 | unsigned char oldaddr[6]; | |
127 | struct net_bridge_port *p; | |
128 | int wasroot; | |
129 | ||
130 | wasroot = br_is_root_bridge(br); | |
131 | ||
132 | memcpy(oldaddr, br->bridge_id.addr, ETH_ALEN); | |
133 | memcpy(br->bridge_id.addr, addr, ETH_ALEN); | |
134 | memcpy(br->dev->dev_addr, addr, ETH_ALEN); | |
135 | ||
136 | list_for_each_entry(p, &br->port_list, list) { | |
6ede2463 | 137 | if (!compare_ether_addr(p->designated_bridge.addr, oldaddr)) |
1da177e4 LT |
138 | memcpy(p->designated_bridge.addr, addr, ETH_ALEN); |
139 | ||
6ede2463 | 140 | if (!compare_ether_addr(p->designated_root.addr, oldaddr)) |
1da177e4 LT |
141 | memcpy(p->designated_root.addr, addr, ETH_ALEN); |
142 | ||
143 | } | |
144 | ||
145 | br_configuration_update(br); | |
146 | br_port_state_selection(br); | |
147 | if (br_is_root_bridge(br) && !wasroot) | |
148 | br_become_root_bridge(br); | |
149 | } | |
150 | ||
151 | static const unsigned char br_mac_zero[6]; | |
152 | ||
153 | /* called under bridge lock */ | |
154 | void br_stp_recalculate_bridge_id(struct net_bridge *br) | |
155 | { | |
156 | const unsigned char *addr = br_mac_zero; | |
157 | struct net_bridge_port *p; | |
158 | ||
159 | list_for_each_entry(p, &br->port_list, list) { | |
160 | if (addr == br_mac_zero || | |
6ede2463 | 161 | compare_ether_addr(p->dev->dev_addr, addr) < 0) |
1da177e4 LT |
162 | addr = p->dev->dev_addr; |
163 | ||
164 | } | |
165 | ||
6ede2463 | 166 | if (compare_ether_addr(br->bridge_id.addr, addr)) |
1da177e4 LT |
167 | br_stp_change_bridge_id(br, addr); |
168 | } | |
169 | ||
170 | /* called under bridge lock */ | |
171 | void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio) | |
172 | { | |
173 | struct net_bridge_port *p; | |
174 | int wasroot; | |
175 | ||
176 | wasroot = br_is_root_bridge(br); | |
177 | ||
178 | list_for_each_entry(p, &br->port_list, list) { | |
179 | if (p->state != BR_STATE_DISABLED && | |
180 | br_is_designated_port(p)) { | |
181 | p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF; | |
182 | p->designated_bridge.prio[1] = newprio & 0xFF; | |
183 | } | |
184 | ||
185 | } | |
186 | ||
187 | br->bridge_id.prio[0] = (newprio >> 8) & 0xFF; | |
188 | br->bridge_id.prio[1] = newprio & 0xFF; | |
189 | br_configuration_update(br); | |
190 | br_port_state_selection(br); | |
191 | if (br_is_root_bridge(br) && !wasroot) | |
192 | br_become_root_bridge(br); | |
193 | } | |
194 | ||
195 | /* called under bridge lock */ | |
196 | void br_stp_set_port_priority(struct net_bridge_port *p, u8 newprio) | |
197 | { | |
198 | port_id new_port_id = br_make_port_id(newprio, p->port_no); | |
199 | ||
200 | if (br_is_designated_port(p)) | |
201 | p->designated_port = new_port_id; | |
202 | ||
203 | p->port_id = new_port_id; | |
204 | p->priority = newprio; | |
205 | if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) && | |
206 | p->port_id < p->designated_port) { | |
207 | br_become_designated_port(p); | |
208 | br_port_state_selection(p->br); | |
209 | } | |
210 | } | |
211 | ||
212 | /* called under bridge lock */ | |
213 | void br_stp_set_path_cost(struct net_bridge_port *p, u32 path_cost) | |
214 | { | |
215 | p->path_cost = path_cost; | |
216 | br_configuration_update(p->br); | |
217 | br_port_state_selection(p->br); | |
218 | } | |
219 | ||
220 | ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id) | |
221 | { | |
222 | return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n", | |
223 | id->prio[0], id->prio[1], | |
224 | id->addr[0], id->addr[1], id->addr[2], | |
225 | id->addr[3], id->addr[4], id->addr[5]); | |
226 | } |