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 struct brport_attribute *brport_attrs[] = { 147 &brport_attr_path_cost, 148 &brport_attr_priority, 149 &brport_attr_port_id, 150 &brport_attr_port_no, 151 &brport_attr_designated_root, 152 &brport_attr_designated_bridge, 153 &brport_attr_designated_port, 154 &brport_attr_designated_cost, 155 &brport_attr_state, 156 &brport_attr_change_ack, 157 &brport_attr_config_pending, 158 &brport_attr_message_age_timer, 159 &brport_attr_forward_delay_timer, 160 &brport_attr_hold_timer, 161 &brport_attr_flush, 162 NULL 163 }; 164 165 #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr) 166 #define to_brport(obj) container_of(obj, struct net_bridge_port, kobj) 167 168 static ssize_t brport_show(struct kobject * kobj, 169 struct attribute * attr, char * buf) 170 { 171 struct brport_attribute * brport_attr = to_brport_attr(attr); 172 struct net_bridge_port * p = to_brport(kobj); 173 174 return brport_attr->show(p, buf); 175 } 176 177 static ssize_t brport_store(struct kobject * kobj, 178 struct attribute * attr, 179 const char * buf, size_t count) 180 { 181 struct brport_attribute * brport_attr = to_brport_attr(attr); 182 struct net_bridge_port * p = to_brport(kobj); 183 ssize_t ret = -EINVAL; 184 char *endp; 185 unsigned long val; 186 187 if (!capable(CAP_NET_ADMIN)) 188 return -EPERM; 189 190 val = simple_strtoul(buf, &endp, 0); 191 if (endp != buf) { 192 rtnl_lock(); 193 if (p->dev && p->br && brport_attr->store) { 194 spin_lock_bh(&p->br->lock); 195 ret = brport_attr->store(p, val); 196 spin_unlock_bh(&p->br->lock); 197 if (ret == 0) 198 ret = count; 199 } 200 rtnl_unlock(); 201 } 202 return ret; 203 } 204 205 struct sysfs_ops brport_sysfs_ops = { 206 .show = brport_show, 207 .store = brport_store, 208 }; 209 210 /* 211 * Add sysfs entries to ethernet device added to a bridge. 212 * Creates a brport subdirectory with bridge attributes. 213 * Puts symlink in bridge's brport subdirectory 214 */ 215 int br_sysfs_addif(struct net_bridge_port *p) 216 { 217 struct net_bridge *br = p->br; 218 struct brport_attribute **a; 219 int err; 220 221 err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj, 222 SYSFS_BRIDGE_PORT_LINK); 223 if (err) 224 goto out2; 225 226 for (a = brport_attrs; *a; ++a) { 227 err = sysfs_create_file(&p->kobj, &((*a)->attr)); 228 if (err) 229 goto out2; 230 } 231 232 err = sysfs_create_link(br->ifobj, &p->kobj, p->dev->name); 233 out2: 234 return err; 235 } 236