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 ssize_t (*store)(struct net_bridge_port *, unsigned long); 27 }; 28 29 #define BRPORT_ATTR(_name,_mode,_show,_store) \ 30 struct brport_attribute brport_attr_##_name = { \ 31 .attr = {.name = __stringify(_name), \ 32 .mode = _mode }, \ 33 .show = _show, \ 34 .store = _store, \ 35 }; 36 37 static ssize_t show_path_cost(struct net_bridge_port *p, char *buf) 38 { 39 return sprintf(buf, "%d\n", p->path_cost); 40 } 41 static ssize_t store_path_cost(struct net_bridge_port *p, unsigned long v) 42 { 43 br_stp_set_path_cost(p, v); 44 return 0; 45 } 46 static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR, 47 show_path_cost, store_path_cost); 48 49 static ssize_t show_priority(struct net_bridge_port *p, char *buf) 50 { 51 return sprintf(buf, "%d\n", p->priority); 52 } 53 static ssize_t store_priority(struct net_bridge_port *p, unsigned long v) 54 { 55 if (v >= (1<<(16-BR_PORT_BITS))) 56 return -ERANGE; 57 br_stp_set_port_priority(p, v); 58 return 0; 59 } 60 static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR, 61 show_priority, store_priority); 62 63 static ssize_t show_designated_root(struct net_bridge_port *p, char *buf) 64 { 65 return br_show_bridge_id(buf, &p->designated_root); 66 } 67 static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL); 68 69 static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf) 70 { 71 return br_show_bridge_id(buf, &p->designated_bridge); 72 } 73 static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL); 74 75 static ssize_t show_designated_port(struct net_bridge_port *p, char *buf) 76 { 77 return sprintf(buf, "%d\n", p->designated_port); 78 } 79 static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL); 80 81 static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf) 82 { 83 return sprintf(buf, "%d\n", p->designated_cost); 84 } 85 static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL); 86 87 static ssize_t show_port_id(struct net_bridge_port *p, char *buf) 88 { 89 return sprintf(buf, "0x%x\n", p->port_id); 90 } 91 static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL); 92 93 static ssize_t show_port_no(struct net_bridge_port *p, char *buf) 94 { 95 return sprintf(buf, "0x%x\n", p->port_no); 96 } 97 98 static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL); 99 100 static ssize_t show_change_ack(struct net_bridge_port *p, char *buf) 101 { 102 return sprintf(buf, "%d\n", p->topology_change_ack); 103 } 104 static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL); 105 106 static ssize_t show_config_pending(struct net_bridge_port *p, char *buf) 107 { 108 return sprintf(buf, "%d\n", p->config_pending); 109 } 110 static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL); 111 112 static ssize_t show_port_state(struct net_bridge_port *p, char *buf) 113 { 114 return sprintf(buf, "%d\n", p->state); 115 } 116 static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL); 117 118 static ssize_t show_message_age_timer(struct net_bridge_port *p, 119 char *buf) 120 { 121 return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer)); 122 } 123 static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL); 124 125 static ssize_t show_forward_delay_timer(struct net_bridge_port *p, 126 char *buf) 127 { 128 return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer)); 129 } 130 static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL); 131 132 static ssize_t show_hold_timer(struct net_bridge_port *p, 133 char *buf) 134 { 135 return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer)); 136 } 137 static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL); 138 139 static ssize_t store_flush(struct net_bridge_port *p, unsigned long v) 140 { 141 br_fdb_delete_by_port(p->br, p, 0); // Don't delete local entry 142 return 0; 143 } 144 static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush); 145 146 static ssize_t show_hairpin_mode(struct net_bridge_port *p, char *buf) 147 { 148 int hairpin_mode = (p->flags & BR_HAIRPIN_MODE) ? 1 : 0; 149 return sprintf(buf, "%d\n", hairpin_mode); 150 } 151 static ssize_t store_hairpin_mode(struct net_bridge_port *p, unsigned long v) 152 { 153 if (v) 154 p->flags |= BR_HAIRPIN_MODE; 155 else 156 p->flags &= ~BR_HAIRPIN_MODE; 157 return 0; 158 } 159 static BRPORT_ATTR(hairpin_mode, S_IRUGO | S_IWUSR, 160 show_hairpin_mode, store_hairpin_mode); 161 162 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 163 static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf) 164 { 165 return sprintf(buf, "%d\n", p->multicast_router); 166 } 167 168 static ssize_t store_multicast_router(struct net_bridge_port *p, 169 unsigned long v) 170 { 171 return br_multicast_set_port_router(p, v); 172 } 173 static BRPORT_ATTR(multicast_router, S_IRUGO | S_IWUSR, show_multicast_router, 174 store_multicast_router); 175 #endif 176 177 static struct brport_attribute *brport_attrs[] = { 178 &brport_attr_path_cost, 179 &brport_attr_priority, 180 &brport_attr_port_id, 181 &brport_attr_port_no, 182 &brport_attr_designated_root, 183 &brport_attr_designated_bridge, 184 &brport_attr_designated_port, 185 &brport_attr_designated_cost, 186 &brport_attr_state, 187 &brport_attr_change_ack, 188 &brport_attr_config_pending, 189 &brport_attr_message_age_timer, 190 &brport_attr_forward_delay_timer, 191 &brport_attr_hold_timer, 192 &brport_attr_flush, 193 &brport_attr_hairpin_mode, 194 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 195 &brport_attr_multicast_router, 196 #endif 197 NULL 198 }; 199 200 #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr) 201 #define to_brport(obj) container_of(obj, struct net_bridge_port, kobj) 202 203 static ssize_t brport_show(struct kobject * kobj, 204 struct attribute * attr, char * buf) 205 { 206 struct brport_attribute * brport_attr = to_brport_attr(attr); 207 struct net_bridge_port * p = to_brport(kobj); 208 209 return brport_attr->show(p, buf); 210 } 211 212 static ssize_t brport_store(struct kobject * kobj, 213 struct attribute * attr, 214 const char * buf, size_t count) 215 { 216 struct brport_attribute * brport_attr = to_brport_attr(attr); 217 struct net_bridge_port * p = to_brport(kobj); 218 ssize_t ret = -EINVAL; 219 char *endp; 220 unsigned long val; 221 222 if (!capable(CAP_NET_ADMIN)) 223 return -EPERM; 224 225 val = simple_strtoul(buf, &endp, 0); 226 if (endp != buf) { 227 if (!rtnl_trylock()) 228 return restart_syscall(); 229 if (p->dev && p->br && brport_attr->store) { 230 spin_lock_bh(&p->br->lock); 231 ret = brport_attr->store(p, val); 232 spin_unlock_bh(&p->br->lock); 233 if (ret == 0) 234 ret = count; 235 } 236 rtnl_unlock(); 237 } 238 return ret; 239 } 240 241 const struct sysfs_ops brport_sysfs_ops = { 242 .show = brport_show, 243 .store = brport_store, 244 }; 245 246 /* 247 * Add sysfs entries to ethernet device added to a bridge. 248 * Creates a brport subdirectory with bridge attributes. 249 * Puts symlink in bridge's brif subdirectory 250 */ 251 int br_sysfs_addif(struct net_bridge_port *p) 252 { 253 struct net_bridge *br = p->br; 254 struct brport_attribute **a; 255 int err; 256 257 err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj, 258 SYSFS_BRIDGE_PORT_LINK); 259 if (err) 260 return err; 261 262 for (a = brport_attrs; *a; ++a) { 263 err = sysfs_create_file(&p->kobj, &((*a)->attr)); 264 if (err) 265 return err; 266 } 267 268 strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ); 269 return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name); 270 } 271 272 /* Rename bridge's brif symlink */ 273 int br_sysfs_renameif(struct net_bridge_port *p) 274 { 275 struct net_bridge *br = p->br; 276 int err; 277 278 /* If a rename fails, the rollback will cause another 279 * rename call with the existing name. 280 */ 281 if (!strncmp(p->sysfs_name, p->dev->name, IFNAMSIZ)) 282 return 0; 283 284 err = sysfs_rename_link(br->ifobj, &p->kobj, 285 p->sysfs_name, p->dev->name); 286 if (err) 287 netdev_notice(br->dev, "unable to rename link %s to %s", 288 p->sysfs_name, p->dev->name); 289 else 290 strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ); 291 292 return err; 293 } 294