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/capability.h> 15 #include <linux/kernel.h> 16 #include <linux/netdevice.h> 17 #include <linux/if_bridge.h> 18 #include <linux/rtnetlink.h> 19 #include <linux/spinlock.h> 20 #include <linux/sched/signal.h> 21 22 #include "br_private.h" 23 24 struct brport_attribute { 25 struct attribute attr; 26 ssize_t (*show)(struct net_bridge_port *, char *); 27 int (*store)(struct net_bridge_port *, unsigned long); 28 }; 29 30 #define BRPORT_ATTR(_name, _mode, _show, _store) \ 31 const struct brport_attribute brport_attr_##_name = { \ 32 .attr = {.name = __stringify(_name), \ 33 .mode = _mode }, \ 34 .show = _show, \ 35 .store = _store, \ 36 }; 37 38 #define BRPORT_ATTR_FLAG(_name, _mask) \ 39 static ssize_t show_##_name(struct net_bridge_port *p, char *buf) \ 40 { \ 41 return sprintf(buf, "%d\n", !!(p->flags & _mask)); \ 42 } \ 43 static int store_##_name(struct net_bridge_port *p, unsigned long v) \ 44 { \ 45 return store_flag(p, v, _mask); \ 46 } \ 47 static BRPORT_ATTR(_name, S_IRUGO | S_IWUSR, \ 48 show_##_name, store_##_name) 49 50 static int store_flag(struct net_bridge_port *p, unsigned long v, 51 unsigned long mask) 52 { 53 unsigned long flags; 54 55 flags = p->flags; 56 57 if (v) 58 flags |= mask; 59 else 60 flags &= ~mask; 61 62 if (flags != p->flags) { 63 p->flags = flags; 64 br_port_flags_change(p, mask); 65 } 66 return 0; 67 } 68 69 static ssize_t show_path_cost(struct net_bridge_port *p, char *buf) 70 { 71 return sprintf(buf, "%d\n", p->path_cost); 72 } 73 74 static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR, 75 show_path_cost, br_stp_set_path_cost); 76 77 static ssize_t show_priority(struct net_bridge_port *p, char *buf) 78 { 79 return sprintf(buf, "%d\n", p->priority); 80 } 81 82 static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR, 83 show_priority, br_stp_set_port_priority); 84 85 static ssize_t show_designated_root(struct net_bridge_port *p, char *buf) 86 { 87 return br_show_bridge_id(buf, &p->designated_root); 88 } 89 static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL); 90 91 static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf) 92 { 93 return br_show_bridge_id(buf, &p->designated_bridge); 94 } 95 static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL); 96 97 static ssize_t show_designated_port(struct net_bridge_port *p, char *buf) 98 { 99 return sprintf(buf, "%d\n", p->designated_port); 100 } 101 static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL); 102 103 static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf) 104 { 105 return sprintf(buf, "%d\n", p->designated_cost); 106 } 107 static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL); 108 109 static ssize_t show_port_id(struct net_bridge_port *p, char *buf) 110 { 111 return sprintf(buf, "0x%x\n", p->port_id); 112 } 113 static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL); 114 115 static ssize_t show_port_no(struct net_bridge_port *p, char *buf) 116 { 117 return sprintf(buf, "0x%x\n", p->port_no); 118 } 119 120 static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL); 121 122 static ssize_t show_change_ack(struct net_bridge_port *p, char *buf) 123 { 124 return sprintf(buf, "%d\n", p->topology_change_ack); 125 } 126 static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL); 127 128 static ssize_t show_config_pending(struct net_bridge_port *p, char *buf) 129 { 130 return sprintf(buf, "%d\n", p->config_pending); 131 } 132 static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL); 133 134 static ssize_t show_port_state(struct net_bridge_port *p, char *buf) 135 { 136 return sprintf(buf, "%d\n", p->state); 137 } 138 static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL); 139 140 static ssize_t show_message_age_timer(struct net_bridge_port *p, 141 char *buf) 142 { 143 return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer)); 144 } 145 static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL); 146 147 static ssize_t show_forward_delay_timer(struct net_bridge_port *p, 148 char *buf) 149 { 150 return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer)); 151 } 152 static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL); 153 154 static ssize_t show_hold_timer(struct net_bridge_port *p, 155 char *buf) 156 { 157 return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer)); 158 } 159 static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL); 160 161 static int store_flush(struct net_bridge_port *p, unsigned long v) 162 { 163 br_fdb_delete_by_port(p->br, p, 0, 0); // Don't delete local entry 164 return 0; 165 } 166 static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush); 167 168 static ssize_t show_group_fwd_mask(struct net_bridge_port *p, char *buf) 169 { 170 return sprintf(buf, "%#x\n", p->group_fwd_mask); 171 } 172 173 static int store_group_fwd_mask(struct net_bridge_port *p, 174 unsigned long v) 175 { 176 if (v & BR_GROUPFWD_MACPAUSE) 177 return -EINVAL; 178 p->group_fwd_mask = v; 179 180 return 0; 181 } 182 static BRPORT_ATTR(group_fwd_mask, S_IRUGO | S_IWUSR, show_group_fwd_mask, 183 store_group_fwd_mask); 184 185 BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE); 186 BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD); 187 BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK); 188 BRPORT_ATTR_FLAG(learning, BR_LEARNING); 189 BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD); 190 BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP); 191 BRPORT_ATTR_FLAG(proxyarp_wifi, BR_PROXYARP_WIFI); 192 BRPORT_ATTR_FLAG(multicast_flood, BR_MCAST_FLOOD); 193 BRPORT_ATTR_FLAG(broadcast_flood, BR_BCAST_FLOOD); 194 BRPORT_ATTR_FLAG(neigh_suppress, BR_NEIGH_SUPPRESS); 195 196 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 197 static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf) 198 { 199 return sprintf(buf, "%d\n", p->multicast_router); 200 } 201 202 static int store_multicast_router(struct net_bridge_port *p, 203 unsigned long v) 204 { 205 return br_multicast_set_port_router(p, v); 206 } 207 static BRPORT_ATTR(multicast_router, S_IRUGO | S_IWUSR, show_multicast_router, 208 store_multicast_router); 209 210 BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE); 211 BRPORT_ATTR_FLAG(multicast_to_unicast, BR_MULTICAST_TO_UNICAST); 212 #endif 213 214 static const struct brport_attribute *brport_attrs[] = { 215 &brport_attr_path_cost, 216 &brport_attr_priority, 217 &brport_attr_port_id, 218 &brport_attr_port_no, 219 &brport_attr_designated_root, 220 &brport_attr_designated_bridge, 221 &brport_attr_designated_port, 222 &brport_attr_designated_cost, 223 &brport_attr_state, 224 &brport_attr_change_ack, 225 &brport_attr_config_pending, 226 &brport_attr_message_age_timer, 227 &brport_attr_forward_delay_timer, 228 &brport_attr_hold_timer, 229 &brport_attr_flush, 230 &brport_attr_hairpin_mode, 231 &brport_attr_bpdu_guard, 232 &brport_attr_root_block, 233 &brport_attr_learning, 234 &brport_attr_unicast_flood, 235 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 236 &brport_attr_multicast_router, 237 &brport_attr_multicast_fast_leave, 238 &brport_attr_multicast_to_unicast, 239 #endif 240 &brport_attr_proxyarp, 241 &brport_attr_proxyarp_wifi, 242 &brport_attr_multicast_flood, 243 &brport_attr_broadcast_flood, 244 &brport_attr_group_fwd_mask, 245 &brport_attr_neigh_suppress, 246 NULL 247 }; 248 249 #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr) 250 #define to_brport(obj) container_of(obj, struct net_bridge_port, kobj) 251 252 static ssize_t brport_show(struct kobject *kobj, 253 struct attribute *attr, char *buf) 254 { 255 struct brport_attribute *brport_attr = to_brport_attr(attr); 256 struct net_bridge_port *p = to_brport(kobj); 257 258 return brport_attr->show(p, buf); 259 } 260 261 static ssize_t brport_store(struct kobject *kobj, 262 struct attribute *attr, 263 const char *buf, size_t count) 264 { 265 struct brport_attribute *brport_attr = to_brport_attr(attr); 266 struct net_bridge_port *p = to_brport(kobj); 267 ssize_t ret = -EINVAL; 268 char *endp; 269 unsigned long val; 270 271 if (!ns_capable(dev_net(p->dev)->user_ns, CAP_NET_ADMIN)) 272 return -EPERM; 273 274 val = simple_strtoul(buf, &endp, 0); 275 if (endp != buf) { 276 if (!rtnl_trylock()) 277 return restart_syscall(); 278 if (p->dev && p->br && brport_attr->store) { 279 spin_lock_bh(&p->br->lock); 280 ret = brport_attr->store(p, val); 281 spin_unlock_bh(&p->br->lock); 282 if (!ret) { 283 br_ifinfo_notify(RTM_NEWLINK, NULL, p); 284 ret = count; 285 } 286 } 287 rtnl_unlock(); 288 } 289 return ret; 290 } 291 292 const struct sysfs_ops brport_sysfs_ops = { 293 .show = brport_show, 294 .store = brport_store, 295 }; 296 297 /* 298 * Add sysfs entries to ethernet device added to a bridge. 299 * Creates a brport subdirectory with bridge attributes. 300 * Puts symlink in bridge's brif subdirectory 301 */ 302 int br_sysfs_addif(struct net_bridge_port *p) 303 { 304 struct net_bridge *br = p->br; 305 const struct brport_attribute **a; 306 int err; 307 308 err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj, 309 SYSFS_BRIDGE_PORT_LINK); 310 if (err) 311 return err; 312 313 for (a = brport_attrs; *a; ++a) { 314 err = sysfs_create_file(&p->kobj, &((*a)->attr)); 315 if (err) 316 return err; 317 } 318 319 strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ); 320 return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name); 321 } 322 323 /* Rename bridge's brif symlink */ 324 int br_sysfs_renameif(struct net_bridge_port *p) 325 { 326 struct net_bridge *br = p->br; 327 int err; 328 329 /* If a rename fails, the rollback will cause another 330 * rename call with the existing name. 331 */ 332 if (!strncmp(p->sysfs_name, p->dev->name, IFNAMSIZ)) 333 return 0; 334 335 err = sysfs_rename_link(br->ifobj, &p->kobj, 336 p->sysfs_name, p->dev->name); 337 if (err) 338 netdev_notice(br->dev, "unable to rename link %s to %s", 339 p->sysfs_name, p->dev->name); 340 else 341 strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ); 342 343 return err; 344 } 345