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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> | |
18 | ||
19 | #include "br_private.h" | |
20 | #include "br_private_stp.h" | |
21 | ||
22 | ||
23 | /* Port id is composed of priority and port number. | |
24 | * NB: least significant bits of priority are dropped to | |
25 | * make room for more ports. | |
26 | */ | |
27 | static inline port_id br_make_port_id(__u8 priority, __u16 port_no) | |
28 | { | |
29 | return ((u16)priority << BR_PORT_BITS) | |
30 | | (port_no & ((1<<BR_PORT_BITS)-1)); | |
31 | } | |
32 | ||
33 | /* called under bridge lock */ | |
34 | void br_init_port(struct net_bridge_port *p) | |
35 | { | |
36 | p->port_id = br_make_port_id(p->priority, p->port_no); | |
37 | br_become_designated_port(p); | |
38 | p->state = BR_STATE_BLOCKING; | |
39 | p->topology_change_ack = 0; | |
40 | p->config_pending = 0; | |
41 | ||
42 | br_stp_port_timer_init(p); | |
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); | |
53 | ||
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 | ||
69 | spin_lock(&br->lock); | |
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; | |
78 | spin_unlock(&br->lock); | |
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 | ||
113 | br_configuration_update(br); | |
114 | ||
115 | br_port_state_selection(br); | |
116 | ||
117 | if (br_is_root_bridge(br) && !wasroot) | |
118 | br_become_root_bridge(br); | |
119 | } | |
120 | ||
121 | /* called under bridge lock */ | |
122 | static void br_stp_change_bridge_id(struct net_bridge *br, | |
123 | const unsigned char *addr) | |
124 | { | |
125 | unsigned char oldaddr[6]; | |
126 | struct net_bridge_port *p; | |
127 | int wasroot; | |
128 | ||
129 | wasroot = br_is_root_bridge(br); | |
130 | ||
131 | memcpy(oldaddr, br->bridge_id.addr, ETH_ALEN); | |
132 | memcpy(br->bridge_id.addr, addr, ETH_ALEN); | |
133 | memcpy(br->dev->dev_addr, addr, ETH_ALEN); | |
134 | ||
135 | list_for_each_entry(p, &br->port_list, list) { | |
136 | if (!memcmp(p->designated_bridge.addr, oldaddr, ETH_ALEN)) | |
137 | memcpy(p->designated_bridge.addr, addr, ETH_ALEN); | |
138 | ||
139 | if (!memcmp(p->designated_root.addr, oldaddr, ETH_ALEN)) | |
140 | memcpy(p->designated_root.addr, addr, ETH_ALEN); | |
141 | ||
142 | } | |
143 | ||
144 | br_configuration_update(br); | |
145 | br_port_state_selection(br); | |
146 | if (br_is_root_bridge(br) && !wasroot) | |
147 | br_become_root_bridge(br); | |
148 | } | |
149 | ||
150 | static const unsigned char br_mac_zero[6]; | |
151 | ||
152 | /* called under bridge lock */ | |
153 | void br_stp_recalculate_bridge_id(struct net_bridge *br) | |
154 | { | |
155 | const unsigned char *addr = br_mac_zero; | |
156 | struct net_bridge_port *p; | |
157 | ||
158 | list_for_each_entry(p, &br->port_list, list) { | |
159 | if (addr == br_mac_zero || | |
160 | memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0) | |
161 | addr = p->dev->dev_addr; | |
162 | ||
163 | } | |
164 | ||
165 | if (memcmp(br->bridge_id.addr, addr, ETH_ALEN)) | |
166 | br_stp_change_bridge_id(br, addr); | |
167 | } | |
168 | ||
169 | /* called under bridge lock */ | |
170 | void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio) | |
171 | { | |
172 | struct net_bridge_port *p; | |
173 | int wasroot; | |
174 | ||
175 | wasroot = br_is_root_bridge(br); | |
176 | ||
177 | list_for_each_entry(p, &br->port_list, list) { | |
178 | if (p->state != BR_STATE_DISABLED && | |
179 | br_is_designated_port(p)) { | |
180 | p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF; | |
181 | p->designated_bridge.prio[1] = newprio & 0xFF; | |
182 | } | |
183 | ||
184 | } | |
185 | ||
186 | br->bridge_id.prio[0] = (newprio >> 8) & 0xFF; | |
187 | br->bridge_id.prio[1] = newprio & 0xFF; | |
188 | br_configuration_update(br); | |
189 | br_port_state_selection(br); | |
190 | if (br_is_root_bridge(br) && !wasroot) | |
191 | br_become_root_bridge(br); | |
192 | } | |
193 | ||
194 | /* called under bridge lock */ | |
195 | void br_stp_set_port_priority(struct net_bridge_port *p, u8 newprio) | |
196 | { | |
197 | port_id new_port_id = br_make_port_id(newprio, p->port_no); | |
198 | ||
199 | if (br_is_designated_port(p)) | |
200 | p->designated_port = new_port_id; | |
201 | ||
202 | p->port_id = new_port_id; | |
203 | p->priority = newprio; | |
204 | if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) && | |
205 | p->port_id < p->designated_port) { | |
206 | br_become_designated_port(p); | |
207 | br_port_state_selection(p->br); | |
208 | } | |
209 | } | |
210 | ||
211 | /* called under bridge lock */ | |
212 | void br_stp_set_path_cost(struct net_bridge_port *p, u32 path_cost) | |
213 | { | |
214 | p->path_cost = path_cost; | |
215 | br_configuration_update(p->br); | |
216 | br_port_state_selection(p->br); | |
217 | } | |
218 | ||
219 | ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id) | |
220 | { | |
221 | return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n", | |
222 | id->prio[0], id->prio[1], | |
223 | id->addr[0], id->addr[1], id->addr[2], | |
224 | id->addr[3], id->addr[4], id->addr[5]); | |
225 | } |