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412 lines
11 KiB
412 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Sysfs attributes of bridge ports |
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* Linux ethernet bridge |
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* |
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* Authors: |
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* Stephen Hemminger <[email protected]> |
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*/ |
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#include <linux/capability.h> |
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#include <linux/kernel.h> |
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#include <linux/netdevice.h> |
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#include <linux/if_bridge.h> |
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#include <linux/rtnetlink.h> |
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#include <linux/spinlock.h> |
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#include <linux/sched/signal.h> |
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#include "br_private.h" |
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/* IMPORTANT: new bridge port options must be added with netlink support only |
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* please do not add new sysfs entries |
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*/ |
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struct brport_attribute { |
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struct attribute attr; |
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ssize_t (*show)(struct net_bridge_port *, char *); |
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int (*store)(struct net_bridge_port *, unsigned long); |
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int (*store_raw)(struct net_bridge_port *, char *); |
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}; |
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#define BRPORT_ATTR_RAW(_name, _mode, _show, _store) \ |
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const struct brport_attribute brport_attr_##_name = { \ |
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.attr = {.name = __stringify(_name), \ |
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.mode = _mode }, \ |
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.show = _show, \ |
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.store_raw = _store, \ |
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}; |
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#define BRPORT_ATTR(_name, _mode, _show, _store) \ |
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const struct brport_attribute brport_attr_##_name = { \ |
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.attr = {.name = __stringify(_name), \ |
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.mode = _mode }, \ |
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.show = _show, \ |
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.store = _store, \ |
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}; |
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#define BRPORT_ATTR_FLAG(_name, _mask) \ |
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static ssize_t show_##_name(struct net_bridge_port *p, char *buf) \ |
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{ \ |
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return sprintf(buf, "%d\n", !!(p->flags & _mask)); \ |
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} \ |
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static int store_##_name(struct net_bridge_port *p, unsigned long v) \ |
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{ \ |
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return store_flag(p, v, _mask); \ |
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} \ |
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static BRPORT_ATTR(_name, 0644, \ |
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show_##_name, store_##_name) |
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static int store_flag(struct net_bridge_port *p, unsigned long v, |
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unsigned long mask) |
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{ |
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struct netlink_ext_ack extack = {0}; |
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unsigned long flags = p->flags; |
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int err; |
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if (v) |
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flags |= mask; |
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else |
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flags &= ~mask; |
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if (flags != p->flags) { |
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err = br_switchdev_set_port_flag(p, flags, mask, &extack); |
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if (err) { |
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netdev_err(p->dev, "%s\n", extack._msg); |
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return err; |
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} |
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p->flags = flags; |
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br_port_flags_change(p, mask); |
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} |
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return 0; |
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} |
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static ssize_t show_path_cost(struct net_bridge_port *p, char *buf) |
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{ |
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return sprintf(buf, "%d\n", p->path_cost); |
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} |
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static BRPORT_ATTR(path_cost, 0644, |
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show_path_cost, br_stp_set_path_cost); |
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static ssize_t show_priority(struct net_bridge_port *p, char *buf) |
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{ |
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return sprintf(buf, "%d\n", p->priority); |
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} |
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static BRPORT_ATTR(priority, 0644, |
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show_priority, br_stp_set_port_priority); |
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static ssize_t show_designated_root(struct net_bridge_port *p, char *buf) |
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{ |
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return br_show_bridge_id(buf, &p->designated_root); |
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} |
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static BRPORT_ATTR(designated_root, 0444, show_designated_root, NULL); |
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static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf) |
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{ |
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return br_show_bridge_id(buf, &p->designated_bridge); |
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} |
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static BRPORT_ATTR(designated_bridge, 0444, show_designated_bridge, NULL); |
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static ssize_t show_designated_port(struct net_bridge_port *p, char *buf) |
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{ |
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return sprintf(buf, "%d\n", p->designated_port); |
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} |
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static BRPORT_ATTR(designated_port, 0444, show_designated_port, NULL); |
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static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf) |
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{ |
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return sprintf(buf, "%d\n", p->designated_cost); |
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} |
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static BRPORT_ATTR(designated_cost, 0444, show_designated_cost, NULL); |
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static ssize_t show_port_id(struct net_bridge_port *p, char *buf) |
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{ |
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return sprintf(buf, "0x%x\n", p->port_id); |
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} |
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static BRPORT_ATTR(port_id, 0444, show_port_id, NULL); |
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static ssize_t show_port_no(struct net_bridge_port *p, char *buf) |
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{ |
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return sprintf(buf, "0x%x\n", p->port_no); |
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} |
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static BRPORT_ATTR(port_no, 0444, show_port_no, NULL); |
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static ssize_t show_change_ack(struct net_bridge_port *p, char *buf) |
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{ |
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return sprintf(buf, "%d\n", p->topology_change_ack); |
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} |
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static BRPORT_ATTR(change_ack, 0444, show_change_ack, NULL); |
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static ssize_t show_config_pending(struct net_bridge_port *p, char *buf) |
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{ |
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return sprintf(buf, "%d\n", p->config_pending); |
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} |
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static BRPORT_ATTR(config_pending, 0444, show_config_pending, NULL); |
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static ssize_t show_port_state(struct net_bridge_port *p, char *buf) |
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{ |
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return sprintf(buf, "%d\n", p->state); |
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} |
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static BRPORT_ATTR(state, 0444, show_port_state, NULL); |
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static ssize_t show_message_age_timer(struct net_bridge_port *p, |
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char *buf) |
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{ |
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return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer)); |
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} |
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static BRPORT_ATTR(message_age_timer, 0444, show_message_age_timer, NULL); |
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static ssize_t show_forward_delay_timer(struct net_bridge_port *p, |
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char *buf) |
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{ |
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return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer)); |
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} |
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static BRPORT_ATTR(forward_delay_timer, 0444, show_forward_delay_timer, NULL); |
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static ssize_t show_hold_timer(struct net_bridge_port *p, |
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char *buf) |
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{ |
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return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer)); |
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} |
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static BRPORT_ATTR(hold_timer, 0444, show_hold_timer, NULL); |
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static int store_flush(struct net_bridge_port *p, unsigned long v) |
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{ |
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br_fdb_delete_by_port(p->br, p, 0, 0); // Don't delete local entry |
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return 0; |
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} |
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static BRPORT_ATTR(flush, 0200, NULL, store_flush); |
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static ssize_t show_group_fwd_mask(struct net_bridge_port *p, char *buf) |
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{ |
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return sprintf(buf, "%#x\n", p->group_fwd_mask); |
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} |
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static int store_group_fwd_mask(struct net_bridge_port *p, |
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unsigned long v) |
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{ |
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if (v & BR_GROUPFWD_MACPAUSE) |
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return -EINVAL; |
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p->group_fwd_mask = v; |
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return 0; |
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} |
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static BRPORT_ATTR(group_fwd_mask, 0644, show_group_fwd_mask, |
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store_group_fwd_mask); |
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static ssize_t show_backup_port(struct net_bridge_port *p, char *buf) |
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{ |
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struct net_bridge_port *backup_p; |
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int ret = 0; |
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rcu_read_lock(); |
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backup_p = rcu_dereference(p->backup_port); |
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if (backup_p) |
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ret = sprintf(buf, "%s\n", backup_p->dev->name); |
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rcu_read_unlock(); |
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return ret; |
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} |
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static int store_backup_port(struct net_bridge_port *p, char *buf) |
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{ |
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struct net_device *backup_dev = NULL; |
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char *nl = strchr(buf, '\n'); |
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if (nl) |
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*nl = '\0'; |
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if (strlen(buf) > 0) { |
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backup_dev = __dev_get_by_name(dev_net(p->dev), buf); |
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if (!backup_dev) |
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return -ENOENT; |
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} |
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return nbp_backup_change(p, backup_dev); |
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} |
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static BRPORT_ATTR_RAW(backup_port, 0644, show_backup_port, store_backup_port); |
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BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE); |
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BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD); |
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BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK); |
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BRPORT_ATTR_FLAG(learning, BR_LEARNING); |
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BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD); |
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BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP); |
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BRPORT_ATTR_FLAG(proxyarp_wifi, BR_PROXYARP_WIFI); |
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BRPORT_ATTR_FLAG(multicast_flood, BR_MCAST_FLOOD); |
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BRPORT_ATTR_FLAG(broadcast_flood, BR_BCAST_FLOOD); |
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BRPORT_ATTR_FLAG(neigh_suppress, BR_NEIGH_SUPPRESS); |
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BRPORT_ATTR_FLAG(isolated, BR_ISOLATED); |
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#ifdef CONFIG_BRIDGE_IGMP_SNOOPING |
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static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf) |
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{ |
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return sprintf(buf, "%d\n", p->multicast_ctx.multicast_router); |
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} |
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static int store_multicast_router(struct net_bridge_port *p, |
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unsigned long v) |
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{ |
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return br_multicast_set_port_router(&p->multicast_ctx, v); |
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} |
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static BRPORT_ATTR(multicast_router, 0644, show_multicast_router, |
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store_multicast_router); |
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BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE); |
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BRPORT_ATTR_FLAG(multicast_to_unicast, BR_MULTICAST_TO_UNICAST); |
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#endif |
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static const struct brport_attribute *brport_attrs[] = { |
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&brport_attr_path_cost, |
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&brport_attr_priority, |
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&brport_attr_port_id, |
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&brport_attr_port_no, |
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&brport_attr_designated_root, |
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&brport_attr_designated_bridge, |
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&brport_attr_designated_port, |
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&brport_attr_designated_cost, |
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&brport_attr_state, |
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&brport_attr_change_ack, |
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&brport_attr_config_pending, |
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&brport_attr_message_age_timer, |
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&brport_attr_forward_delay_timer, |
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&brport_attr_hold_timer, |
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&brport_attr_flush, |
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&brport_attr_hairpin_mode, |
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&brport_attr_bpdu_guard, |
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&brport_attr_root_block, |
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&brport_attr_learning, |
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&brport_attr_unicast_flood, |
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#ifdef CONFIG_BRIDGE_IGMP_SNOOPING |
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&brport_attr_multicast_router, |
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&brport_attr_multicast_fast_leave, |
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&brport_attr_multicast_to_unicast, |
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#endif |
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&brport_attr_proxyarp, |
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&brport_attr_proxyarp_wifi, |
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&brport_attr_multicast_flood, |
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&brport_attr_broadcast_flood, |
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&brport_attr_group_fwd_mask, |
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&brport_attr_neigh_suppress, |
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&brport_attr_isolated, |
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&brport_attr_backup_port, |
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NULL |
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}; |
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#define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr) |
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static ssize_t brport_show(struct kobject *kobj, |
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struct attribute *attr, char *buf) |
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{ |
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struct brport_attribute *brport_attr = to_brport_attr(attr); |
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struct net_bridge_port *p = kobj_to_brport(kobj); |
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if (!brport_attr->show) |
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return -EINVAL; |
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return brport_attr->show(p, buf); |
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} |
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static ssize_t brport_store(struct kobject *kobj, |
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struct attribute *attr, |
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const char *buf, size_t count) |
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{ |
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struct brport_attribute *brport_attr = to_brport_attr(attr); |
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struct net_bridge_port *p = kobj_to_brport(kobj); |
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ssize_t ret = -EINVAL; |
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unsigned long val; |
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char *endp; |
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if (!ns_capable(dev_net(p->dev)->user_ns, CAP_NET_ADMIN)) |
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return -EPERM; |
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if (!rtnl_trylock()) |
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return restart_syscall(); |
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if (brport_attr->store_raw) { |
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char *buf_copy; |
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buf_copy = kstrndup(buf, count, GFP_KERNEL); |
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if (!buf_copy) { |
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ret = -ENOMEM; |
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goto out_unlock; |
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} |
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spin_lock_bh(&p->br->lock); |
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ret = brport_attr->store_raw(p, buf_copy); |
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spin_unlock_bh(&p->br->lock); |
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kfree(buf_copy); |
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} else if (brport_attr->store) { |
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val = simple_strtoul(buf, &endp, 0); |
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if (endp == buf) |
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goto out_unlock; |
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spin_lock_bh(&p->br->lock); |
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ret = brport_attr->store(p, val); |
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spin_unlock_bh(&p->br->lock); |
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} |
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if (!ret) { |
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br_ifinfo_notify(RTM_NEWLINK, NULL, p); |
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ret = count; |
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} |
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out_unlock: |
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rtnl_unlock(); |
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return ret; |
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} |
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const struct sysfs_ops brport_sysfs_ops = { |
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.show = brport_show, |
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.store = brport_store, |
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}; |
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/* |
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* Add sysfs entries to ethernet device added to a bridge. |
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* Creates a brport subdirectory with bridge attributes. |
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* Puts symlink in bridge's brif subdirectory |
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*/ |
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int br_sysfs_addif(struct net_bridge_port *p) |
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{ |
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struct net_bridge *br = p->br; |
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const struct brport_attribute **a; |
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int err; |
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err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj, |
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SYSFS_BRIDGE_PORT_LINK); |
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if (err) |
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return err; |
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for (a = brport_attrs; *a; ++a) { |
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err = sysfs_create_file(&p->kobj, &((*a)->attr)); |
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if (err) |
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return err; |
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} |
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strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ); |
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return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name); |
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} |
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/* Rename bridge's brif symlink */ |
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int br_sysfs_renameif(struct net_bridge_port *p) |
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{ |
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struct net_bridge *br = p->br; |
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int err; |
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/* If a rename fails, the rollback will cause another |
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* rename call with the existing name. |
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*/ |
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if (!strncmp(p->sysfs_name, p->dev->name, IFNAMSIZ)) |
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return 0; |
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err = sysfs_rename_link(br->ifobj, &p->kobj, |
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p->sysfs_name, p->dev->name); |
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if (err) |
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netdev_notice(br->dev, "unable to rename link %s to %s", |
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p->sysfs_name, p->dev->name); |
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else |
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strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ); |
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return err; |
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}
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