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 | { | |
31 | return ((u16)priority << BR_PORT_BITS) | |
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); | |
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 | ||
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); | |
11dc1f36 | 90 | br_ifinfo_notify(RTM_NEWLINK, p); |
1da177e4 LT |
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 | ||
11dc1f36 SH |
104 | br_ifinfo_notify(RTM_DELLINK, p); |
105 | ||
1da177e4 LT |
106 | wasroot = br_is_root_bridge(br); |
107 | br_become_designated_port(p); | |
108 | p->state = BR_STATE_DISABLED; | |
109 | p->topology_change_ack = 0; | |
110 | p->config_pending = 0; | |
111 | ||
112 | del_timer(&p->message_age_timer); | |
113 | del_timer(&p->forward_delay_timer); | |
114 | del_timer(&p->hold_timer); | |
115 | ||
1a620698 SH |
116 | br_fdb_delete_by_port(br, p, 0); |
117 | ||
1da177e4 LT |
118 | br_configuration_update(br); |
119 | ||
120 | br_port_state_selection(br); | |
121 | ||
122 | if (br_is_root_bridge(br) && !wasroot) | |
123 | br_become_root_bridge(br); | |
124 | } | |
125 | ||
126 | /* called under bridge lock */ | |
4505a3ef | 127 | void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *addr) |
1da177e4 LT |
128 | { |
129 | unsigned char oldaddr[6]; | |
130 | struct net_bridge_port *p; | |
131 | int wasroot; | |
132 | ||
133 | wasroot = br_is_root_bridge(br); | |
134 | ||
135 | memcpy(oldaddr, br->bridge_id.addr, ETH_ALEN); | |
136 | memcpy(br->bridge_id.addr, addr, ETH_ALEN); | |
137 | memcpy(br->dev->dev_addr, addr, ETH_ALEN); | |
138 | ||
139 | list_for_each_entry(p, &br->port_list, list) { | |
6ede2463 | 140 | if (!compare_ether_addr(p->designated_bridge.addr, oldaddr)) |
1da177e4 LT |
141 | memcpy(p->designated_bridge.addr, addr, ETH_ALEN); |
142 | ||
6ede2463 | 143 | if (!compare_ether_addr(p->designated_root.addr, oldaddr)) |
1da177e4 LT |
144 | memcpy(p->designated_root.addr, addr, ETH_ALEN); |
145 | ||
146 | } | |
147 | ||
148 | br_configuration_update(br); | |
149 | br_port_state_selection(br); | |
150 | if (br_is_root_bridge(br) && !wasroot) | |
151 | br_become_root_bridge(br); | |
152 | } | |
153 | ||
154 | static const unsigned char br_mac_zero[6]; | |
155 | ||
156 | /* called under bridge lock */ | |
157 | void br_stp_recalculate_bridge_id(struct net_bridge *br) | |
158 | { | |
159 | const unsigned char *addr = br_mac_zero; | |
160 | struct net_bridge_port *p; | |
161 | ||
162 | list_for_each_entry(p, &br->port_list, list) { | |
163 | if (addr == br_mac_zero || | |
554c9a8e | 164 | memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0) |
1da177e4 LT |
165 | addr = p->dev->dev_addr; |
166 | ||
167 | } | |
168 | ||
6ede2463 | 169 | if (compare_ether_addr(br->bridge_id.addr, addr)) |
1da177e4 LT |
170 | br_stp_change_bridge_id(br, addr); |
171 | } | |
172 | ||
173 | /* called under bridge lock */ | |
174 | void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio) | |
175 | { | |
176 | struct net_bridge_port *p; | |
177 | int wasroot; | |
178 | ||
179 | wasroot = br_is_root_bridge(br); | |
180 | ||
181 | list_for_each_entry(p, &br->port_list, list) { | |
182 | if (p->state != BR_STATE_DISABLED && | |
183 | br_is_designated_port(p)) { | |
184 | p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF; | |
185 | p->designated_bridge.prio[1] = newprio & 0xFF; | |
186 | } | |
187 | ||
188 | } | |
189 | ||
190 | br->bridge_id.prio[0] = (newprio >> 8) & 0xFF; | |
191 | br->bridge_id.prio[1] = newprio & 0xFF; | |
192 | br_configuration_update(br); | |
193 | br_port_state_selection(br); | |
194 | if (br_is_root_bridge(br) && !wasroot) | |
195 | br_become_root_bridge(br); | |
196 | } | |
197 | ||
198 | /* called under bridge lock */ | |
199 | void br_stp_set_port_priority(struct net_bridge_port *p, u8 newprio) | |
200 | { | |
201 | port_id new_port_id = br_make_port_id(newprio, p->port_no); | |
202 | ||
203 | if (br_is_designated_port(p)) | |
204 | p->designated_port = new_port_id; | |
205 | ||
206 | p->port_id = new_port_id; | |
207 | p->priority = newprio; | |
208 | if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) && | |
209 | p->port_id < p->designated_port) { | |
210 | br_become_designated_port(p); | |
211 | br_port_state_selection(p->br); | |
212 | } | |
213 | } | |
214 | ||
215 | /* called under bridge lock */ | |
216 | void br_stp_set_path_cost(struct net_bridge_port *p, u32 path_cost) | |
217 | { | |
218 | p->path_cost = path_cost; | |
219 | br_configuration_update(p->br); | |
220 | br_port_state_selection(p->br); | |
221 | } | |
222 | ||
223 | ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id) | |
224 | { | |
225 | return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n", | |
226 | id->prio[0], id->prio[1], | |
227 | id->addr[0], id->addr[1], id->addr[2], | |
228 | id->addr[3], id->addr[4], id->addr[5]); | |
229 | } |