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 br_ifinfo_notify(RTM_NEWLINK, p); 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); // Don't delete local entry 164 return 0; 165 } 166 static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush); 167 168 BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE); 169 BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD); 170 BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK); 171 BRPORT_ATTR_FLAG(learning, BR_LEARNING); 172 BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD); 173 BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP); 174 175 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 176 static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf) 177 { 178 return sprintf(buf, "%d\n", p->multicast_router); 179 } 180 181 static int store_multicast_router(struct net_bridge_port *p, 182 unsigned long v) 183 { 184 return br_multicast_set_port_router(p, v); 185 } 186 static BRPORT_ATTR(multicast_router, S_IRUGO | S_IWUSR, show_multicast_router, 187 store_multicast_router); 188 189 BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE); 190 #endif 191 192 static const struct brport_attribute *brport_attrs[] = { 193 &brport_attr_path_cost, 194 &brport_attr_priority, 195 &brport_attr_port_id, 196 &brport_attr_port_no, 197 &brport_attr_designated_root, 198 &brport_attr_designated_bridge, 199 &brport_attr_designated_port, 200 &brport_attr_designated_cost, 201 &brport_attr_state, 202 &brport_attr_change_ack, 203 &brport_attr_config_pending, 204 &brport_attr_message_age_timer, 205 &brport_attr_forward_delay_timer, 206 &brport_attr_hold_timer, 207 &brport_attr_flush, 208 &brport_attr_hairpin_mode, 209 &brport_attr_bpdu_guard, 210 &brport_attr_root_block, 211 &brport_attr_learning, 212 &brport_attr_unicast_flood, 213 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 214 &brport_attr_multicast_router, 215 &brport_attr_multicast_fast_leave, 216 #endif 217 &brport_attr_proxyarp, 218 NULL 219 }; 220 221 #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr) 222 #define to_brport(obj) container_of(obj, struct net_bridge_port, kobj) 223 224 static ssize_t brport_show(struct kobject *kobj, 225 struct attribute *attr, char *buf) 226 { 227 struct brport_attribute *brport_attr = to_brport_attr(attr); 228 struct net_bridge_port *p = to_brport(kobj); 229 230 return brport_attr->show(p, buf); 231 } 232 233 static ssize_t brport_store(struct kobject *kobj, 234 struct attribute *attr, 235 const char *buf, size_t count) 236 { 237 struct brport_attribute *brport_attr = to_brport_attr(attr); 238 struct net_bridge_port *p = to_brport(kobj); 239 ssize_t ret = -EINVAL; 240 char *endp; 241 unsigned long val; 242 243 if (!ns_capable(dev_net(p->dev)->user_ns, CAP_NET_ADMIN)) 244 return -EPERM; 245 246 val = simple_strtoul(buf, &endp, 0); 247 if (endp != buf) { 248 if (!rtnl_trylock()) 249 return restart_syscall(); 250 if (p->dev && p->br && brport_attr->store) { 251 spin_lock_bh(&p->br->lock); 252 ret = brport_attr->store(p, val); 253 spin_unlock_bh(&p->br->lock); 254 if (ret == 0) 255 ret = count; 256 } 257 rtnl_unlock(); 258 } 259 return ret; 260 } 261 262 const struct sysfs_ops brport_sysfs_ops = { 263 .show = brport_show, 264 .store = brport_store, 265 }; 266 267 /* 268 * Add sysfs entries to ethernet device added to a bridge. 269 * Creates a brport subdirectory with bridge attributes. 270 * Puts symlink in bridge's brif subdirectory 271 */ 272 int br_sysfs_addif(struct net_bridge_port *p) 273 { 274 struct net_bridge *br = p->br; 275 const struct brport_attribute **a; 276 int err; 277 278 err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj, 279 SYSFS_BRIDGE_PORT_LINK); 280 if (err) 281 return err; 282 283 for (a = brport_attrs; *a; ++a) { 284 err = sysfs_create_file(&p->kobj, &((*a)->attr)); 285 if (err) 286 return err; 287 } 288 289 strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ); 290 return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name); 291 } 292 293 /* Rename bridge's brif symlink */ 294 int br_sysfs_renameif(struct net_bridge_port *p) 295 { 296 struct net_bridge *br = p->br; 297 int err; 298 299 /* If a rename fails, the rollback will cause another 300 * rename call with the existing name. 301 */ 302 if (!strncmp(p->sysfs_name, p->dev->name, IFNAMSIZ)) 303 return 0; 304 305 err = sysfs_rename_link(br->ifobj, &p->kobj, 306 p->sysfs_name, p->dev->name); 307 if (err) 308 netdev_notice(br->dev, "unable to rename link %s to %s", 309 p->sysfs_name, p->dev->name); 310 else 311 strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ); 312 313 return err; 314 } 315