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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Stephen Hemminger6ede2462005-10-25 15:04:59 -070018#include <linux/etherdevice.h>
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070019#include <linux/rtnetlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
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 */
29static inline port_id br_make_port_id(__u8 priority, __u16 port_no)
30{
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +090031 return ((u16)priority << BR_PORT_BITS)
Linus Torvalds1da177e2005-04-16 15:20:36 -070032 | (port_no & ((1<<BR_PORT_BITS)-1));
33}
34
35/* called under bridge lock */
36void 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070043}
44
45/* called under bridge lock */
46void 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);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +090053
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 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 */
65void br_stp_disable_bridge(struct net_bridge *br)
66{
67 struct net_bridge_port *p;
68
Adrian Drzewiecki78872cc2006-02-15 01:47:48 -080069 spin_lock_bh(&br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 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;
Adrian Drzewiecki78872cc2006-02-15 01:47:48 -080078 spin_unlock_bh(&br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
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 */
87void br_stp_enable_port(struct net_bridge_port *p)
88{
89 br_init_port(p);
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070090 br_ifinfo_notify(RTM_NEWLINK, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 br_port_state_selection(p->br);
92}
93
94/* called under bridge lock */
95void 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
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700104 br_ifinfo_notify(RTM_DELLINK, p);
105
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 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
Stephen Hemminger1a620692006-10-12 14:45:38 -0700116 br_fdb_delete_by_port(br, p, 0);
117
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 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 */
Stephen Hemminger4505a3e2005-12-21 18:51:49 -0800127void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128{
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) {
Stephen Hemminger6ede2462005-10-25 15:04:59 -0700140 if (!compare_ether_addr(p->designated_bridge.addr, oldaddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 memcpy(p->designated_bridge.addr, addr, ETH_ALEN);
142
Stephen Hemminger6ede2462005-10-25 15:04:59 -0700143 if (!compare_ether_addr(p->designated_root.addr, oldaddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 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
154static const unsigned char br_mac_zero[6];
155
156/* called under bridge lock */
157void 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 ||
Stephen Hemminger554c9a82006-01-03 14:35:54 -0800164 memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 addr = p->dev->dev_addr;
166
167 }
168
Stephen Hemminger6ede2462005-10-25 15:04:59 -0700169 if (compare_ether_addr(br->bridge_id.addr, addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 br_stp_change_bridge_id(br, addr);
171}
172
173/* called under bridge lock */
174void 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 */
199void 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 */
216void 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
223ssize_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}