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