1 /* 2 * Sysfs attributes of bridge ports 3 * Linux ethernet bridge 4 * 5 * Authors: 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. 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/netdevice.h> 16 #include <linux/if_bridge.h> 17 #include <linux/rtnetlink.h> 18 #include <linux/spinlock.h> 19 #include <linux/times.h> 20 21 #include "br_private.h" 22 23 #define to_class_dev(obj) container_of(obj,struct class_device,kobj) 24 #define to_net_dev(class) container_of(class, struct net_device, class_dev) 25 #define to_bridge(cd) ((struct net_bridge *)(to_net_dev(cd)->priv)) 26 27 /* 28 * Common code for storing bridge parameters. 29 */ 30 static ssize_t store_bridge_parm(struct class_device *cd, 31 const char *buf, size_t len, 32 void (*set)(struct net_bridge *, unsigned long)) 33 { 34 struct net_bridge *br = to_bridge(cd); 35 char *endp; 36 unsigned long val; 37 38 if (!capable(CAP_NET_ADMIN)) 39 return -EPERM; 40 41 val = simple_strtoul(buf, &endp, 0); 42 if (endp == buf) 43 return -EINVAL; 44 45 spin_lock_bh(&br->lock); 46 (*set)(br, val); 47 spin_unlock_bh(&br->lock); 48 return len; 49 } 50 51 52 static ssize_t show_forward_delay(struct class_device *cd, char *buf) 53 { 54 struct net_bridge *br = to_bridge(cd); 55 return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->forward_delay)); 56 } 57 58 static void set_forward_delay(struct net_bridge *br, unsigned long val) 59 { 60 unsigned long delay = clock_t_to_jiffies(val); 61 br->forward_delay = delay; 62 if (br_is_root_bridge(br)) 63 br->bridge_forward_delay = delay; 64 } 65 66 static ssize_t store_forward_delay(struct class_device *cd, const char *buf, 67 size_t len) 68 { 69 return store_bridge_parm(cd, buf, len, set_forward_delay); 70 } 71 static CLASS_DEVICE_ATTR(forward_delay, S_IRUGO | S_IWUSR, 72 show_forward_delay, store_forward_delay); 73 74 static ssize_t show_hello_time(struct class_device *cd, char *buf) 75 { 76 return sprintf(buf, "%lu\n", 77 jiffies_to_clock_t(to_bridge(cd)->hello_time)); 78 } 79 80 static void set_hello_time(struct net_bridge *br, unsigned long val) 81 { 82 unsigned long t = clock_t_to_jiffies(val); 83 br->hello_time = t; 84 if (br_is_root_bridge(br)) 85 br->bridge_hello_time = t; 86 } 87 88 static ssize_t store_hello_time(struct class_device *cd, const char *buf, 89 size_t len) 90 { 91 return store_bridge_parm(cd, buf, len, set_hello_time); 92 } 93 94 static CLASS_DEVICE_ATTR(hello_time, S_IRUGO | S_IWUSR, show_hello_time, 95 store_hello_time); 96 97 static ssize_t show_max_age(struct class_device *cd, char *buf) 98 { 99 return sprintf(buf, "%lu\n", 100 jiffies_to_clock_t(to_bridge(cd)->max_age)); 101 } 102 103 static void set_max_age(struct net_bridge *br, unsigned long val) 104 { 105 unsigned long t = clock_t_to_jiffies(val); 106 br->max_age = t; 107 if (br_is_root_bridge(br)) 108 br->bridge_max_age = t; 109 } 110 111 static ssize_t store_max_age(struct class_device *cd, const char *buf, 112 size_t len) 113 { 114 return store_bridge_parm(cd, buf, len, set_max_age); 115 } 116 117 static CLASS_DEVICE_ATTR(max_age, S_IRUGO | S_IWUSR, show_max_age, 118 store_max_age); 119 120 static ssize_t show_ageing_time(struct class_device *cd, char *buf) 121 { 122 struct net_bridge *br = to_bridge(cd); 123 return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->ageing_time)); 124 } 125 126 static void set_ageing_time(struct net_bridge *br, unsigned long val) 127 { 128 br->ageing_time = clock_t_to_jiffies(val); 129 } 130 131 static ssize_t store_ageing_time(struct class_device *cd, const char *buf, 132 size_t len) 133 { 134 return store_bridge_parm(cd, buf, len, set_ageing_time); 135 } 136 137 static CLASS_DEVICE_ATTR(ageing_time, S_IRUGO | S_IWUSR, show_ageing_time, 138 store_ageing_time); 139 static ssize_t show_stp_state(struct class_device *cd, char *buf) 140 { 141 struct net_bridge *br = to_bridge(cd); 142 return sprintf(buf, "%d\n", br->stp_enabled); 143 } 144 145 static void set_stp_state(struct net_bridge *br, unsigned long val) 146 { 147 br->stp_enabled = val; 148 } 149 150 static ssize_t store_stp_state(struct class_device *cd, 151 const char *buf, size_t len) 152 { 153 return store_bridge_parm(cd, buf, len, set_stp_state); 154 } 155 156 static CLASS_DEVICE_ATTR(stp_state, S_IRUGO | S_IWUSR, show_stp_state, 157 store_stp_state); 158 159 static ssize_t show_priority(struct class_device *cd, char *buf) 160 { 161 struct net_bridge *br = to_bridge(cd); 162 return sprintf(buf, "%d\n", 163 (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]); 164 } 165 166 static void set_priority(struct net_bridge *br, unsigned long val) 167 { 168 br_stp_set_bridge_priority(br, (u16) val); 169 } 170 171 static ssize_t store_priority(struct class_device *cd, 172 const char *buf, size_t len) 173 { 174 return store_bridge_parm(cd, buf, len, set_priority); 175 } 176 static CLASS_DEVICE_ATTR(priority, S_IRUGO | S_IWUSR, show_priority, 177 store_priority); 178 179 static ssize_t show_root_id(struct class_device *cd, char *buf) 180 { 181 return br_show_bridge_id(buf, &to_bridge(cd)->designated_root); 182 } 183 static CLASS_DEVICE_ATTR(root_id, S_IRUGO, show_root_id, NULL); 184 185 static ssize_t show_bridge_id(struct class_device *cd, char *buf) 186 { 187 return br_show_bridge_id(buf, &to_bridge(cd)->bridge_id); 188 } 189 static CLASS_DEVICE_ATTR(bridge_id, S_IRUGO, show_bridge_id, NULL); 190 191 static ssize_t show_root_port(struct class_device *cd, char *buf) 192 { 193 return sprintf(buf, "%d\n", to_bridge(cd)->root_port); 194 } 195 static CLASS_DEVICE_ATTR(root_port, S_IRUGO, show_root_port, NULL); 196 197 static ssize_t show_root_path_cost(struct class_device *cd, char *buf) 198 { 199 return sprintf(buf, "%d\n", to_bridge(cd)->root_path_cost); 200 } 201 static CLASS_DEVICE_ATTR(root_path_cost, S_IRUGO, show_root_path_cost, NULL); 202 203 static ssize_t show_topology_change(struct class_device *cd, char *buf) 204 { 205 return sprintf(buf, "%d\n", to_bridge(cd)->topology_change); 206 } 207 static CLASS_DEVICE_ATTR(topology_change, S_IRUGO, show_topology_change, NULL); 208 209 static ssize_t show_topology_change_detected(struct class_device *cd, char *buf) 210 { 211 struct net_bridge *br = to_bridge(cd); 212 return sprintf(buf, "%d\n", br->topology_change_detected); 213 } 214 static CLASS_DEVICE_ATTR(topology_change_detected, S_IRUGO, show_topology_change_detected, NULL); 215 216 static ssize_t show_hello_timer(struct class_device *cd, char *buf) 217 { 218 struct net_bridge *br = to_bridge(cd); 219 return sprintf(buf, "%ld\n", br_timer_value(&br->hello_timer)); 220 } 221 static CLASS_DEVICE_ATTR(hello_timer, S_IRUGO, show_hello_timer, NULL); 222 223 static ssize_t show_tcn_timer(struct class_device *cd, char *buf) 224 { 225 struct net_bridge *br = to_bridge(cd); 226 return sprintf(buf, "%ld\n", br_timer_value(&br->tcn_timer)); 227 } 228 static CLASS_DEVICE_ATTR(tcn_timer, S_IRUGO, show_tcn_timer, NULL); 229 230 static ssize_t show_topology_change_timer(struct class_device *cd, char *buf) 231 { 232 struct net_bridge *br = to_bridge(cd); 233 return sprintf(buf, "%ld\n", br_timer_value(&br->topology_change_timer)); 234 } 235 static CLASS_DEVICE_ATTR(topology_change_timer, S_IRUGO, show_topology_change_timer, NULL); 236 237 static ssize_t show_gc_timer(struct class_device *cd, char *buf) 238 { 239 struct net_bridge *br = to_bridge(cd); 240 return sprintf(buf, "%ld\n", br_timer_value(&br->gc_timer)); 241 } 242 static CLASS_DEVICE_ATTR(gc_timer, S_IRUGO, show_gc_timer, NULL); 243 244 static struct attribute *bridge_attrs[] = { 245 &class_device_attr_forward_delay.attr, 246 &class_device_attr_hello_time.attr, 247 &class_device_attr_max_age.attr, 248 &class_device_attr_ageing_time.attr, 249 &class_device_attr_stp_state.attr, 250 &class_device_attr_priority.attr, 251 &class_device_attr_bridge_id.attr, 252 &class_device_attr_root_id.attr, 253 &class_device_attr_root_path_cost.attr, 254 &class_device_attr_root_port.attr, 255 &class_device_attr_topology_change.attr, 256 &class_device_attr_topology_change_detected.attr, 257 &class_device_attr_hello_timer.attr, 258 &class_device_attr_tcn_timer.attr, 259 &class_device_attr_topology_change_timer.attr, 260 &class_device_attr_gc_timer.attr, 261 NULL 262 }; 263 264 static struct attribute_group bridge_group = { 265 .name = SYSFS_BRIDGE_ATTR, 266 .attrs = bridge_attrs, 267 }; 268 269 /* 270 * Export the forwarding information table as a binary file 271 * The records are struct __fdb_entry. 272 * 273 * Returns the number of bytes read. 274 */ 275 static ssize_t brforward_read(struct kobject *kobj, char *buf, 276 loff_t off, size_t count) 277 { 278 struct class_device *cdev = to_class_dev(kobj); 279 struct net_bridge *br = to_bridge(cdev); 280 int n; 281 282 /* must read whole records */ 283 if (off % sizeof(struct __fdb_entry) != 0) 284 return -EINVAL; 285 286 n = br_fdb_fillbuf(br, buf, 287 count / sizeof(struct __fdb_entry), 288 off / sizeof(struct __fdb_entry)); 289 290 if (n > 0) 291 n *= sizeof(struct __fdb_entry); 292 293 return n; 294 } 295 296 static struct bin_attribute bridge_forward = { 297 .attr = { .name = SYSFS_BRIDGE_FDB, 298 .mode = S_IRUGO, 299 .owner = THIS_MODULE, }, 300 .read = brforward_read, 301 }; 302 303 /* 304 * Add entries in sysfs onto the existing network class device 305 * for the bridge. 306 * Adds a attribute group "bridge" containing tuning parameters. 307 * Binary attribute containing the forward table 308 * Sub directory to hold links to interfaces. 309 * 310 * Note: the ifobj exists only to be a subdirectory 311 * to hold links. The ifobj exists in same data structure 312 * as it's parent the bridge so reference counting works. 313 */ 314 int br_sysfs_addbr(struct net_device *dev) 315 { 316 struct kobject *brobj = &dev->class_dev.kobj; 317 struct net_bridge *br = netdev_priv(dev); 318 int err; 319 320 err = sysfs_create_group(brobj, &bridge_group); 321 if (err) { 322 pr_info("%s: can't create group %s/%s\n", 323 __FUNCTION__, dev->name, bridge_group.name); 324 goto out1; 325 } 326 327 err = sysfs_create_bin_file(brobj, &bridge_forward); 328 if (err) { 329 pr_info("%s: can't create attribue file %s/%s\n", 330 __FUNCTION__, dev->name, bridge_forward.attr.name); 331 goto out2; 332 } 333 334 335 kobject_set_name(&br->ifobj, SYSFS_BRIDGE_PORT_SUBDIR); 336 br->ifobj.ktype = NULL; 337 br->ifobj.kset = NULL; 338 br->ifobj.parent = brobj; 339 340 err = kobject_register(&br->ifobj); 341 if (err) { 342 pr_info("%s: can't add kobject (directory) %s/%s\n", 343 __FUNCTION__, dev->name, br->ifobj.name); 344 goto out3; 345 } 346 return 0; 347 out3: 348 sysfs_remove_bin_file(&dev->class_dev.kobj, &bridge_forward); 349 out2: 350 sysfs_remove_group(&dev->class_dev.kobj, &bridge_group); 351 out1: 352 return err; 353 354 } 355 356 void br_sysfs_delbr(struct net_device *dev) 357 { 358 struct kobject *kobj = &dev->class_dev.kobj; 359 struct net_bridge *br = netdev_priv(dev); 360 361 kobject_unregister(&br->ifobj); 362 sysfs_remove_bin_file(kobj, &bridge_forward); 363 sysfs_remove_group(kobj, &bridge_group); 364 } 365