Correct .gbs.conf settings
[platform/adaptation/renesas_rcar/renesas_kernel.git] / net / bridge / br_stp_if.c
1 /*
2  *      Spanning tree protocol; interface code
3  *      Linux ethernet bridge
4  *
5  *      Authors:
6  *      Lennert Buytenhek               <buytenh@gnu.org>
7  *
8  *      This program is free software; you can redistribute it and/or
9  *      modify it under the terms of the GNU General Public License
10  *      as published by the Free Software Foundation; either version
11  *      2 of the License, or (at your option) any later version.
12  */
13
14 #include <linux/kernel.h>
15 #include <linux/kmod.h>
16 #include <linux/etherdevice.h>
17 #include <linux/rtnetlink.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: some 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 #define BR_MAX_PORT_PRIORITY ((u16)~0 >> BR_PORT_BITS)
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;
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 (netif_running(p->dev) && netif_oper_up(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_bh(&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_bh(&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         br_log_state(p);
92         br_ifinfo_notify(RTM_NEWLINK, p);
93 }
94
95 /* called under bridge lock */
96 void br_stp_disable_port(struct net_bridge_port *p)
97 {
98         struct net_bridge *br = p->br;
99         int wasroot;
100
101         wasroot = br_is_root_bridge(br);
102         br_become_designated_port(p);
103         p->state = BR_STATE_DISABLED;
104         p->topology_change_ack = 0;
105         p->config_pending = 0;
106
107         br_log_state(p);
108         br_ifinfo_notify(RTM_NEWLINK, p);
109
110         del_timer(&p->message_age_timer);
111         del_timer(&p->forward_delay_timer);
112         del_timer(&p->hold_timer);
113
114         br_fdb_delete_by_port(br, p, 0);
115         br_multicast_disable_port(p);
116
117         br_configuration_update(br);
118
119         br_port_state_selection(br);
120
121         if (br_is_root_bridge(br) && !wasroot)
122                 br_become_root_bridge(br);
123 }
124
125 static void br_stp_start(struct net_bridge *br)
126 {
127         int r;
128         char *argv[] = { BR_STP_PROG, br->dev->name, "start", NULL };
129         char *envp[] = { NULL };
130
131         r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC);
132
133         spin_lock_bh(&br->lock);
134
135         if (br->bridge_forward_delay < BR_MIN_FORWARD_DELAY)
136                 __br_set_forward_delay(br, BR_MIN_FORWARD_DELAY);
137         else if (br->bridge_forward_delay > BR_MAX_FORWARD_DELAY)
138                 __br_set_forward_delay(br, BR_MAX_FORWARD_DELAY);
139
140         if (r == 0) {
141                 br->stp_enabled = BR_USER_STP;
142                 br_debug(br, "userspace STP started\n");
143         } else {
144                 br->stp_enabled = BR_KERNEL_STP;
145                 br_debug(br, "using kernel STP\n");
146
147                 /* To start timers on any ports left in blocking */
148                 br_port_state_selection(br);
149         }
150
151         spin_unlock_bh(&br->lock);
152 }
153
154 static void br_stp_stop(struct net_bridge *br)
155 {
156         int r;
157         char *argv[] = { BR_STP_PROG, br->dev->name, "stop", NULL };
158         char *envp[] = { NULL };
159
160         if (br->stp_enabled == BR_USER_STP) {
161                 r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC);
162                 br_info(br, "userspace STP stopped, return code %d\n", r);
163
164                 /* To start timers on any ports left in blocking */
165                 spin_lock_bh(&br->lock);
166                 br_port_state_selection(br);
167                 spin_unlock_bh(&br->lock);
168         }
169
170         br->stp_enabled = BR_NO_STP;
171 }
172
173 void br_stp_set_enabled(struct net_bridge *br, unsigned long val)
174 {
175         ASSERT_RTNL();
176
177         if (val) {
178                 if (br->stp_enabled == BR_NO_STP)
179                         br_stp_start(br);
180         } else {
181                 if (br->stp_enabled != BR_NO_STP)
182                         br_stp_stop(br);
183         }
184 }
185
186 /* called under bridge lock */
187 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *addr)
188 {
189         /* should be aligned on 2 bytes for ether_addr_equal() */
190         unsigned short oldaddr_aligned[ETH_ALEN >> 1];
191         unsigned char *oldaddr = (unsigned char *)oldaddr_aligned;
192         struct net_bridge_port *p;
193         int wasroot;
194
195         wasroot = br_is_root_bridge(br);
196
197         br_fdb_change_mac_address(br, addr);
198
199         memcpy(oldaddr, br->bridge_id.addr, ETH_ALEN);
200         memcpy(br->bridge_id.addr, addr, ETH_ALEN);
201         memcpy(br->dev->dev_addr, addr, ETH_ALEN);
202
203         list_for_each_entry(p, &br->port_list, list) {
204                 if (ether_addr_equal(p->designated_bridge.addr, oldaddr))
205                         memcpy(p->designated_bridge.addr, addr, ETH_ALEN);
206
207                 if (ether_addr_equal(p->designated_root.addr, oldaddr))
208                         memcpy(p->designated_root.addr, addr, ETH_ALEN);
209         }
210
211         br_configuration_update(br);
212         br_port_state_selection(br);
213         if (br_is_root_bridge(br) && !wasroot)
214                 br_become_root_bridge(br);
215 }
216
217 /* should be aligned on 2 bytes for ether_addr_equal() */
218 static const unsigned short br_mac_zero_aligned[ETH_ALEN >> 1];
219
220 /* called under bridge lock */
221 bool br_stp_recalculate_bridge_id(struct net_bridge *br)
222 {
223         const unsigned char *br_mac_zero =
224                         (const unsigned char *)br_mac_zero_aligned;
225         const unsigned char *addr = br_mac_zero;
226         struct net_bridge_port *p;
227
228         /* user has chosen a value so keep it */
229         if (br->dev->addr_assign_type == NET_ADDR_SET)
230                 return false;
231
232         list_for_each_entry(p, &br->port_list, list) {
233                 if (addr == br_mac_zero ||
234                     memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0)
235                         addr = p->dev->dev_addr;
236
237         }
238
239         if (ether_addr_equal(br->bridge_id.addr, addr))
240                 return false;   /* no change */
241
242         br_stp_change_bridge_id(br, addr);
243         return true;
244 }
245
246 /* called under bridge lock */
247 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio)
248 {
249         struct net_bridge_port *p;
250         int wasroot;
251
252         wasroot = br_is_root_bridge(br);
253
254         list_for_each_entry(p, &br->port_list, list) {
255                 if (p->state != BR_STATE_DISABLED &&
256                     br_is_designated_port(p)) {
257                         p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF;
258                         p->designated_bridge.prio[1] = newprio & 0xFF;
259                 }
260
261         }
262
263         br->bridge_id.prio[0] = (newprio >> 8) & 0xFF;
264         br->bridge_id.prio[1] = newprio & 0xFF;
265         br_configuration_update(br);
266         br_port_state_selection(br);
267         if (br_is_root_bridge(br) && !wasroot)
268                 br_become_root_bridge(br);
269 }
270
271 /* called under bridge lock */
272 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio)
273 {
274         port_id new_port_id;
275
276         if (newprio > BR_MAX_PORT_PRIORITY)
277                 return -ERANGE;
278
279         new_port_id = br_make_port_id(newprio, p->port_no);
280         if (br_is_designated_port(p))
281                 p->designated_port = new_port_id;
282
283         p->port_id = new_port_id;
284         p->priority = newprio;
285         if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) &&
286             p->port_id < p->designated_port) {
287                 br_become_designated_port(p);
288                 br_port_state_selection(p->br);
289         }
290
291         return 0;
292 }
293
294 /* called under bridge lock */
295 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost)
296 {
297         if (path_cost < BR_MIN_PATH_COST ||
298             path_cost > BR_MAX_PATH_COST)
299                 return -ERANGE;
300
301         p->flags |= BR_ADMIN_COST;
302         p->path_cost = path_cost;
303         br_configuration_update(p->br);
304         br_port_state_selection(p->br);
305         return 0;
306 }
307
308 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id)
309 {
310         return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n",
311                id->prio[0], id->prio[1],
312                id->addr[0], id->addr[1], id->addr[2],
313                id->addr[3], id->addr[4], id->addr[5]);
314 }