1 // SPDX-License-Identifier: GPL-2.0-or-later <<
2 /* 1 /*
3 * Sysfs attributes of bridge ports 2 * Sysfs attributes of bridge ports
4 * Linux ethernet bridge 3 * Linux ethernet bridge
5 * 4 *
6 * Authors: 5 * Authors:
7 * Stephen Hemminger <shemm 6 * Stephen Hemminger <shemminger@osdl.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.
8 */ 12 */
9 13
10 #include <linux/capability.h> 14 #include <linux/capability.h>
11 #include <linux/kernel.h> 15 #include <linux/kernel.h>
12 #include <linux/netdevice.h> 16 #include <linux/netdevice.h>
13 #include <linux/if_bridge.h> 17 #include <linux/if_bridge.h>
14 #include <linux/rtnetlink.h> 18 #include <linux/rtnetlink.h>
15 #include <linux/spinlock.h> 19 #include <linux/spinlock.h>
16 #include <linux/sched/signal.h> <<
17 20
18 #include "br_private.h" 21 #include "br_private.h"
19 22
20 /* IMPORTANT: new bridge port options must be <<
21 * please do not add new sysfs entr <<
22 */ <<
23 <<
24 struct brport_attribute { 23 struct brport_attribute {
25 struct attribute attr; 24 struct attribute attr;
26 ssize_t (*show)(struct net_bridge_port 25 ssize_t (*show)(struct net_bridge_port *, char *);
27 int (*store)(struct net_bridge_port *, !! 26 ssize_t (*store)(struct net_bridge_port *, unsigned long);
28 int (*store_raw)(struct net_bridge_por <<
29 }; <<
30 <<
31 #define BRPORT_ATTR_RAW(_name, _mode, _show, _ <<
32 const struct brport_attribute brport_attr_##_n <<
33 .attr = {.name = __stringify <<
34 .mode = _mode }, <<
35 .show = _show, <<
36 .store_raw = _store, <<
37 }; 27 };
38 28
39 #define BRPORT_ATTR(_name, _mode, _show, _stor !! 29 #define BRPORT_ATTR(_name,_mode,_show,_store) \
40 const struct brport_attribute brport_attr_##_n !! 30 struct brport_attribute brport_attr_##_name = { \
41 .attr = {.name = __stringify(_name), 31 .attr = {.name = __stringify(_name), \
42 .mode = _mode }, 32 .mode = _mode }, \
43 .show = _show, 33 .show = _show, \
44 .store = _store, 34 .store = _store, \
45 }; 35 };
46 36
47 #define BRPORT_ATTR_FLAG(_name, _mask) <<
48 static ssize_t show_##_name(struct net_bridge_ <<
49 { <<
50 return sprintf(buf, "%d\n", !!(p->flag <<
51 } <<
52 static int store_##_name(struct net_bridge_por <<
53 { <<
54 return store_flag(p, v, _mask); <<
55 } <<
56 static BRPORT_ATTR(_name, 0644, <<
57 show_##_name, store_##_name <<
58 <<
59 static int store_flag(struct net_bridge_port * <<
60 unsigned long mask) <<
61 { <<
62 struct netlink_ext_ack extack = {0}; <<
63 unsigned long flags = p->flags; <<
64 int err; <<
65 <<
66 if (v) <<
67 flags |= mask; <<
68 else <<
69 flags &= ~mask; <<
70 <<
71 if (flags != p->flags) { <<
72 err = br_switchdev_set_port_fl <<
73 if (err) { <<
74 netdev_err(p->dev, "%s <<
75 return err; <<
76 } <<
77 <<
78 p->flags = flags; <<
79 br_port_flags_change(p, mask); <<
80 } <<
81 return 0; <<
82 } <<
83 <<
84 static ssize_t show_path_cost(struct net_bridg 37 static ssize_t show_path_cost(struct net_bridge_port *p, char *buf)
85 { 38 {
86 return sprintf(buf, "%d\n", p->path_co 39 return sprintf(buf, "%d\n", p->path_cost);
87 } 40 }
88 !! 41 static ssize_t store_path_cost(struct net_bridge_port *p, unsigned long v)
89 static BRPORT_ATTR(path_cost, 0644, !! 42 {
90 show_path_cost, br_stp_set_ !! 43 br_stp_set_path_cost(p, v);
>> 44 return 0;
>> 45 }
>> 46 static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR,
>> 47 show_path_cost, store_path_cost);
91 48
92 static ssize_t show_priority(struct net_bridge 49 static ssize_t show_priority(struct net_bridge_port *p, char *buf)
93 { 50 {
94 return sprintf(buf, "%d\n", p->priorit 51 return sprintf(buf, "%d\n", p->priority);
95 } 52 }
96 !! 53 static ssize_t store_priority(struct net_bridge_port *p, unsigned long v)
97 static BRPORT_ATTR(priority, 0644, !! 54 {
98 show_priority, br_stp !! 55 if (v >= (1<<(16-BR_PORT_BITS)))
>> 56 return -ERANGE;
>> 57 br_stp_set_port_priority(p, v);
>> 58 return 0;
>> 59 }
>> 60 static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR,
>> 61 show_priority, store_priority);
99 62
100 static ssize_t show_designated_root(struct net 63 static ssize_t show_designated_root(struct net_bridge_port *p, char *buf)
101 { 64 {
102 return br_show_bridge_id(buf, &p->desi 65 return br_show_bridge_id(buf, &p->designated_root);
103 } 66 }
104 static BRPORT_ATTR(designated_root, 0444, show !! 67 static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL);
105 68
106 static ssize_t show_designated_bridge(struct n 69 static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf)
107 { 70 {
108 return br_show_bridge_id(buf, &p->desi 71 return br_show_bridge_id(buf, &p->designated_bridge);
109 } 72 }
110 static BRPORT_ATTR(designated_bridge, 0444, sh !! 73 static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL);
111 74
112 static ssize_t show_designated_port(struct net 75 static ssize_t show_designated_port(struct net_bridge_port *p, char *buf)
113 { 76 {
114 return sprintf(buf, "%d\n", p->designa 77 return sprintf(buf, "%d\n", p->designated_port);
115 } 78 }
116 static BRPORT_ATTR(designated_port, 0444, show !! 79 static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL);
117 80
118 static ssize_t show_designated_cost(struct net 81 static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf)
119 { 82 {
120 return sprintf(buf, "%d\n", p->designa 83 return sprintf(buf, "%d\n", p->designated_cost);
121 } 84 }
122 static BRPORT_ATTR(designated_cost, 0444, show !! 85 static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL);
123 86
124 static ssize_t show_port_id(struct net_bridge_ 87 static ssize_t show_port_id(struct net_bridge_port *p, char *buf)
125 { 88 {
126 return sprintf(buf, "0x%x\n", p->port_ 89 return sprintf(buf, "0x%x\n", p->port_id);
127 } 90 }
128 static BRPORT_ATTR(port_id, 0444, show_port_id !! 91 static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL);
129 92
130 static ssize_t show_port_no(struct net_bridge_ 93 static ssize_t show_port_no(struct net_bridge_port *p, char *buf)
131 { 94 {
132 return sprintf(buf, "0x%x\n", p->port_ 95 return sprintf(buf, "0x%x\n", p->port_no);
133 } 96 }
134 97
135 static BRPORT_ATTR(port_no, 0444, show_port_no !! 98 static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL);
136 99
137 static ssize_t show_change_ack(struct net_brid 100 static ssize_t show_change_ack(struct net_bridge_port *p, char *buf)
138 { 101 {
139 return sprintf(buf, "%d\n", p->topolog 102 return sprintf(buf, "%d\n", p->topology_change_ack);
140 } 103 }
141 static BRPORT_ATTR(change_ack, 0444, show_chan !! 104 static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL);
142 105
143 static ssize_t show_config_pending(struct net_ 106 static ssize_t show_config_pending(struct net_bridge_port *p, char *buf)
144 { 107 {
145 return sprintf(buf, "%d\n", p->config_ 108 return sprintf(buf, "%d\n", p->config_pending);
146 } 109 }
147 static BRPORT_ATTR(config_pending, 0444, show_ !! 110 static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL);
148 111
149 static ssize_t show_port_state(struct net_brid 112 static ssize_t show_port_state(struct net_bridge_port *p, char *buf)
150 { 113 {
151 return sprintf(buf, "%d\n", p->state); 114 return sprintf(buf, "%d\n", p->state);
152 } 115 }
153 static BRPORT_ATTR(state, 0444, show_port_stat !! 116 static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL);
154 117
155 static ssize_t show_message_age_timer(struct n 118 static ssize_t show_message_age_timer(struct net_bridge_port *p,
156 ch 119 char *buf)
157 { 120 {
158 return sprintf(buf, "%ld\n", br_timer_ 121 return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
159 } 122 }
160 static BRPORT_ATTR(message_age_timer, 0444, sh !! 123 static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL);
161 124
162 static ssize_t show_forward_delay_timer(struct 125 static ssize_t show_forward_delay_timer(struct net_bridge_port *p,
163 ch 126 char *buf)
164 { 127 {
165 return sprintf(buf, "%ld\n", br_timer_ 128 return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
166 } 129 }
167 static BRPORT_ATTR(forward_delay_timer, 0444, !! 130 static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL);
168 131
169 static ssize_t show_hold_timer(struct net_brid 132 static ssize_t show_hold_timer(struct net_bridge_port *p,
170 ch 133 char *buf)
171 { 134 {
172 return sprintf(buf, "%ld\n", br_timer_ 135 return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
173 } 136 }
174 static BRPORT_ATTR(hold_timer, 0444, show_hold !! 137 static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);
175 138
176 static int store_flush(struct net_bridge_port !! 139 static ssize_t store_flush(struct net_bridge_port *p, unsigned long v)
177 { 140 {
178 br_fdb_delete_by_port(p->br, p, 0, 0); !! 141 br_fdb_delete_by_port(p->br, p, 0); // Don't delete local entry
179 return 0; 142 return 0;
180 } 143 }
181 static BRPORT_ATTR(flush, 0200, NULL, store_fl !! 144 static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush);
182 145
183 static ssize_t show_group_fwd_mask(struct net_ !! 146 static ssize_t show_hairpin_mode(struct net_bridge_port *p, char *buf)
184 { 147 {
185 return sprintf(buf, "%#x\n", p->group_ !! 148 int hairpin_mode = (p->flags & BR_HAIRPIN_MODE) ? 1 : 0;
>> 149 return sprintf(buf, "%d\n", hairpin_mode);
186 } 150 }
187 !! 151 static ssize_t store_hairpin_mode(struct net_bridge_port *p, unsigned long v)
188 static int store_group_fwd_mask(struct net_bri <<
189 unsigned long <<
190 { 152 {
191 if (v & BR_GROUPFWD_MACPAUSE) !! 153 if (v)
192 return -EINVAL; !! 154 p->flags |= BR_HAIRPIN_MODE;
193 p->group_fwd_mask = v; !! 155 else
194 !! 156 p->flags &= ~BR_HAIRPIN_MODE;
195 return 0; 157 return 0;
196 } 158 }
197 static BRPORT_ATTR(group_fwd_mask, 0644, show_ !! 159 static BRPORT_ATTR(hairpin_mode, S_IRUGO | S_IWUSR,
198 store_group_fwd_mask); !! 160 show_hairpin_mode, store_hairpin_mode);
199 <<
200 static ssize_t show_backup_port(struct net_bri <<
201 { <<
202 struct net_bridge_port *backup_p; <<
203 int ret = 0; <<
204 <<
205 rcu_read_lock(); <<
206 backup_p = rcu_dereference(p->backup_p <<
207 if (backup_p) <<
208 ret = sprintf(buf, "%s\n", bac <<
209 rcu_read_unlock(); <<
210 161
211 return ret; !! 162 static struct brport_attribute *brport_attrs[] = {
212 } <<
213 <<
214 static int store_backup_port(struct net_bridge <<
215 { <<
216 struct net_device *backup_dev = NULL; <<
217 char *nl = strchr(buf, '\n'); <<
218 <<
219 if (nl) <<
220 *nl = '\0'; <<
221 <<
222 if (strlen(buf) > 0) { <<
223 backup_dev = __dev_get_by_name <<
224 if (!backup_dev) <<
225 return -ENOENT; <<
226 } <<
227 <<
228 return nbp_backup_change(p, backup_dev <<
229 } <<
230 static BRPORT_ATTR_RAW(backup_port, 0644, show <<
231 <<
232 BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE <<
233 BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD); <<
234 BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK); <<
235 BRPORT_ATTR_FLAG(learning, BR_LEARNING); <<
236 BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD); <<
237 BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP); <<
238 BRPORT_ATTR_FLAG(proxyarp_wifi, BR_PROXYARP_WI <<
239 BRPORT_ATTR_FLAG(multicast_flood, BR_MCAST_FLO <<
240 BRPORT_ATTR_FLAG(broadcast_flood, BR_BCAST_FLO <<
241 BRPORT_ATTR_FLAG(neigh_suppress, BR_NEIGH_SUPP <<
242 BRPORT_ATTR_FLAG(isolated, BR_ISOLATED); <<
243 <<
244 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING <<
245 static ssize_t show_multicast_router(struct ne <<
246 { <<
247 return sprintf(buf, "%d\n", p->multica <<
248 } <<
249 <<
250 static int store_multicast_router(struct net_b <<
251 unsigned <<
252 { <<
253 return br_multicast_set_port_router(&p <<
254 } <<
255 static BRPORT_ATTR(multicast_router, 0644, sho <<
256 store_multicast_router); <<
257 <<
258 BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULT <<
259 BRPORT_ATTR_FLAG(multicast_to_unicast, BR_MULT <<
260 #endif <<
261 <<
262 static const struct brport_attribute *brport_a <<
263 &brport_attr_path_cost, 163 &brport_attr_path_cost,
264 &brport_attr_priority, 164 &brport_attr_priority,
265 &brport_attr_port_id, 165 &brport_attr_port_id,
266 &brport_attr_port_no, 166 &brport_attr_port_no,
267 &brport_attr_designated_root, 167 &brport_attr_designated_root,
268 &brport_attr_designated_bridge, 168 &brport_attr_designated_bridge,
269 &brport_attr_designated_port, 169 &brport_attr_designated_port,
270 &brport_attr_designated_cost, 170 &brport_attr_designated_cost,
271 &brport_attr_state, 171 &brport_attr_state,
272 &brport_attr_change_ack, 172 &brport_attr_change_ack,
273 &brport_attr_config_pending, 173 &brport_attr_config_pending,
274 &brport_attr_message_age_timer, 174 &brport_attr_message_age_timer,
275 &brport_attr_forward_delay_timer, 175 &brport_attr_forward_delay_timer,
276 &brport_attr_hold_timer, 176 &brport_attr_hold_timer,
277 &brport_attr_flush, 177 &brport_attr_flush,
278 &brport_attr_hairpin_mode, 178 &brport_attr_hairpin_mode,
279 &brport_attr_bpdu_guard, <<
280 &brport_attr_root_block, <<
281 &brport_attr_learning, <<
282 &brport_attr_unicast_flood, <<
283 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING <<
284 &brport_attr_multicast_router, <<
285 &brport_attr_multicast_fast_leave, <<
286 &brport_attr_multicast_to_unicast, <<
287 #endif <<
288 &brport_attr_proxyarp, <<
289 &brport_attr_proxyarp_wifi, <<
290 &brport_attr_multicast_flood, <<
291 &brport_attr_broadcast_flood, <<
292 &brport_attr_group_fwd_mask, <<
293 &brport_attr_neigh_suppress, <<
294 &brport_attr_isolated, <<
295 &brport_attr_backup_port, <<
296 NULL 179 NULL
297 }; 180 };
298 181
299 #define to_brport_attr(_at) container_of(_at, 182 #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
>> 183 #define to_brport(obj) container_of(obj, struct net_bridge_port, kobj)
300 184
301 static ssize_t brport_show(struct kobject *kob !! 185 static ssize_t brport_show(struct kobject * kobj,
302 struct attribute *a !! 186 struct attribute * attr, char * buf)
303 { 187 {
304 struct brport_attribute *brport_attr = !! 188 struct brport_attribute * brport_attr = to_brport_attr(attr);
305 struct net_bridge_port *p = kobj_to_br !! 189 struct net_bridge_port * p = to_brport(kobj);
306 <<
307 if (!brport_attr->show) <<
308 return -EINVAL; <<
309 190
310 return brport_attr->show(p, buf); 191 return brport_attr->show(p, buf);
311 } 192 }
312 193
313 static ssize_t brport_store(struct kobject *ko !! 194 static ssize_t brport_store(struct kobject * kobj,
314 struct attribute * !! 195 struct attribute * attr,
315 const char *buf, s !! 196 const char * buf, size_t count)
316 { 197 {
317 struct brport_attribute *brport_attr = !! 198 struct brport_attribute * brport_attr = to_brport_attr(attr);
318 struct net_bridge_port *p = kobj_to_br !! 199 struct net_bridge_port * p = to_brport(kobj);
319 ssize_t ret = -EINVAL; 200 ssize_t ret = -EINVAL;
320 unsigned long val; <<
321 char *endp; 201 char *endp;
>> 202 unsigned long val;
322 203
323 if (!ns_capable(dev_net(p->dev)->user_ !! 204 if (!capable(CAP_NET_ADMIN))
324 return -EPERM; 205 return -EPERM;
325 206
326 if (!rtnl_trylock()) !! 207 val = simple_strtoul(buf, &endp, 0);
327 return restart_syscall(); !! 208 if (endp != buf) {
328 !! 209 if (!rtnl_trylock())
329 if (brport_attr->store_raw) { !! 210 return restart_syscall();
330 char *buf_copy; !! 211 if (p->dev && p->br && brport_attr->store) {
331 !! 212 spin_lock_bh(&p->br->lock);
332 buf_copy = kstrndup(buf, count !! 213 ret = brport_attr->store(p, val);
333 if (!buf_copy) { !! 214 spin_unlock_bh(&p->br->lock);
334 ret = -ENOMEM; !! 215 if (ret == 0)
335 goto out_unlock; !! 216 ret = count;
336 } 217 }
337 spin_lock_bh(&p->br->lock); !! 218 rtnl_unlock();
338 ret = brport_attr->store_raw(p <<
339 spin_unlock_bh(&p->br->lock); <<
340 kfree(buf_copy); <<
341 } else if (brport_attr->store) { <<
342 val = simple_strtoul(buf, &end <<
343 if (endp == buf) <<
344 goto out_unlock; <<
345 spin_lock_bh(&p->br->lock); <<
346 ret = brport_attr->store(p, va <<
347 spin_unlock_bh(&p->br->lock); <<
348 } 219 }
349 <<
350 if (!ret) { <<
351 br_ifinfo_notify(RTM_NEWLINK, <<
352 ret = count; <<
353 } <<
354 out_unlock: <<
355 rtnl_unlock(); <<
356 <<
357 return ret; 220 return ret;
358 } 221 }
359 222
360 const struct sysfs_ops brport_sysfs_ops = { !! 223 struct sysfs_ops brport_sysfs_ops = {
361 .show = brport_show, 224 .show = brport_show,
362 .store = brport_store, 225 .store = brport_store,
363 }; 226 };
364 227
365 /* 228 /*
366 * Add sysfs entries to ethernet device added 229 * Add sysfs entries to ethernet device added to a bridge.
367 * Creates a brport subdirectory with bridge a 230 * Creates a brport subdirectory with bridge attributes.
368 * Puts symlink in bridge's brif subdirectory !! 231 * Puts symlink in bridge's brport subdirectory
369 */ 232 */
370 int br_sysfs_addif(struct net_bridge_port *p) 233 int br_sysfs_addif(struct net_bridge_port *p)
371 { 234 {
372 struct net_bridge *br = p->br; 235 struct net_bridge *br = p->br;
373 const struct brport_attribute **a; !! 236 struct brport_attribute **a;
374 int err; 237 int err;
375 238
376 err = sysfs_create_link(&p->kobj, &br- 239 err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj,
377 SYSFS_BRIDGE_P 240 SYSFS_BRIDGE_PORT_LINK);
378 if (err) 241 if (err)
379 return err; !! 242 goto out2;
380 243
381 for (a = brport_attrs; *a; ++a) { 244 for (a = brport_attrs; *a; ++a) {
382 err = sysfs_create_file(&p->ko 245 err = sysfs_create_file(&p->kobj, &((*a)->attr));
383 if (err) 246 if (err)
384 return err; !! 247 goto out2;
385 } 248 }
386 249
387 strscpy(p->sysfs_name, p->dev->name, I !! 250 err = sysfs_create_link(br->ifobj, &p->kobj, p->dev->name);
388 return sysfs_create_link(br->ifobj, &p !! 251 out2:
389 } <<
390 <<
391 /* Rename bridge's brif symlink */ <<
392 int br_sysfs_renameif(struct net_bridge_port * <<
393 { <<
394 struct net_bridge *br = p->br; <<
395 int err; <<
396 <<
397 /* If a rename fails, the rollback wil <<
398 * rename call with the existing name. <<
399 */ <<
400 if (!strncmp(p->sysfs_name, p->dev->na <<
401 return 0; <<
402 <<
403 err = sysfs_rename_link(br->ifobj, &p- <<
404 p->sysfs_name, <<
405 if (err) <<
406 netdev_notice(br->dev, "unable <<
407 p->sysfs_name, p <<
408 else <<
409 strscpy(p->sysfs_name, p->dev- <<
410 <<
411 return err; 252 return err;
412 } 253 }
413 254
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