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