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 static struct brport_attribute *brport_attrs[] = { 163 &brport_attr_path_cost, 164 &brport_attr_priority, 165 &brport_attr_port_id, 166 &brport_attr_port_no, 167 &brport_attr_designated_root, 168 &brport_attr_designated_bridge, 169 &brport_attr_designated_port, 170 &brport_attr_designated_cost, 171 &brport_attr_state, 172 &brport_attr_change_ack, 173 &brport_attr_config_pending, 174 &brport_attr_message_age_timer, 175 &brport_attr_forward_delay_timer, 176 &brport_attr_hold_timer, 177 &brport_attr_flush, 178 &brport_attr_hairpin_mode, 179 NULL 180 }; 181 182 #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr) 183 #define to_brport(obj) container_of(obj, struct net_bridge_port, kobj) 184 185 static ssize_t brport_show(struct kobject * kobj, 186 struct attribute * attr, char * buf) 187 { 188 struct brport_attribute * brport_attr = to_brport_attr(attr); 189 struct net_bridge_port * p = to_brport(kobj); 190 191 return brport_attr->show(p, buf); 192 } 193 194 static ssize_t brport_store(struct kobject * kobj, 195 struct attribute * attr, 196 const char * buf, size_t count) 197 { 198 struct brport_attribute * brport_attr = to_brport_attr(attr); 199 struct net_bridge_port * p = to_brport(kobj); 200 ssize_t ret = -EINVAL; 201 char *endp; 202 unsigned long val; 203 204 if (!capable(CAP_NET_ADMIN)) 205 return -EPERM; 206 207 val = simple_strtoul(buf, &endp, 0); 208 if (endp != buf) { 209 if (!rtnl_trylock()) 210 return restart_syscall(); 211 if (p->dev && p->br && brport_attr->store) { 212 spin_lock_bh(&p->br->lock); 213 ret = brport_attr->store(p, val); 214 spin_unlock_bh(&p->br->lock); 215 if (ret == 0) 216 ret = count; 217 } 218 rtnl_unlock(); 219 } 220 return ret; 221 } 222 223 struct sysfs_ops brport_sysfs_ops = { 224 .show = brport_show, 225 .store = brport_store, 226 }; 227 228 /* 229 * Add sysfs entries to ethernet device added to a bridge. 230 * Creates a brport subdirectory with bridge attributes. 231 * Puts symlink in bridge's brport subdirectory 232 */ 233 int br_sysfs_addif(struct net_bridge_port *p) 234 { 235 struct net_bridge *br = p->br; 236 struct brport_attribute **a; 237 int err; 238 239 err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj, 240 SYSFS_BRIDGE_PORT_LINK); 241 if (err) 242 goto out2; 243 244 for (a = brport_attrs; *a; ++a) { 245 err = sysfs_create_file(&p->kobj, &((*a)->attr)); 246 if (err) 247 goto out2; 248 } 249 250 err = sysfs_create_link(br->ifobj, &p->kobj, p->dev->name); 251 out2: 252 return err; 253 } 254