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