text: // SPDX-License-Identifier: GPL-2.0
  #include <linux/proc_fs.h>
  #include <linux/export.h>
  #include <net/net_namespace.h>
  #include <net/netns/generic.h>
  #include <net/bonding.h>
  
  #include "bonding_priv.h"
  
  static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
  	__acquires(RCU)
  {
  	struct bonding *bond = seq->private;
  	struct list_head *iter;
  	struct slave *slave;
  	loff_t off = 0;
  
  	rcu_read_lock();
  
  	if (*pos == 0)
  		return SEQ_START_TOKEN;
  
  	bond_for_each_slave_rcu(bond, slave, iter)
  		if (++off == *pos)
  			return slave;
  
  	return NULL;
  }
  
  static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
  {
  	struct bonding *bond = seq->private;
  	struct list_head *iter;
  	struct slave *slave;
  	bool found = false;
  
  	++*pos;
  	if (v == SEQ_START_TOKEN)
  		return bond_first_slave_rcu(bond);
  
  	bond_for_each_slave_rcu(bond, slave, iter) {
  		if (found)
  			return slave;
  		if (slave == v)
  			found = true;
  	}
  
  	return NULL;
  }
  
  static void bond_info_seq_stop(struct seq_file *seq, void *v)
  	__releases(RCU)
  {
  	rcu_read_unlock();
  }
  
  static void bond_info_show_master(struct seq_file *seq)
  {
  	struct bonding *bond = seq->private;
  	const struct bond_opt_value *optval;
  	struct slave *curr, *primary;
  	int i;
  
  	curr = rcu_dereference(bond->curr_active_slave);
  
  	seq_printf(seq, "Bonding Mode: %s",
  		   bond_mode_name(BOND_MODE(bond)));
  
  	if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
  	    bond->params.fail_over_mac) {
  		optval = bond_opt_get_val(BOND_OPT_FAIL_OVER_MAC,
  					  bond->params.fail_over_mac);
  		seq_printf(seq, " (fail_over_mac %s)", optval->string);
  	}
  
  	seq_printf(seq, "\n");
  
  	if (bond_mode_uses_xmit_hash(bond)) {
  		optval = bond_opt_get_val(BOND_OPT_XMIT_HASH,
  					  bond->params.xmit_policy);
  		seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
  			   optval->string, bond->params.xmit_policy);
  	}
  
  	if (bond_uses_primary(bond)) {
  		primary = rcu_dereference(bond->primary_slave);
  		seq_printf(seq, "Primary Slave: %s",
  			   primary ? primary->dev->name : "None");
  		if (primary) {
  			optval = bond_opt_get_val(BOND_OPT_PRIMARY_RESELECT,
  						  bond->params.primary_reselect);
  			seq_printf(seq, " (primary_reselect %s)",
  				   optval->string);
  		}
  
  		seq_printf(seq, "\nCurrently Active Slave: %s\n",
  			   (curr) ? curr->dev->name : "None");
  	}
  
  	seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
  		   "up" : "down");
  	seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
  	seq_printf(seq, "Up Delay (ms): %d\n",
  		   bond->params.updelay * bond->params.miimon);
  	seq_printf(seq, "Down Delay (ms): %d\n",
  		   bond->params.downdelay * bond->params.miimon);
  
  
  	/* ARP information */
  	if (bond->params.arp_interval > 0) {
  		int printed = 0;
  		seq_printf(seq, "ARP Polling Interval (ms): %d\n",
  				bond->params.arp_interval);
  
  		seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
  
  		for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
  			if (!bond->params.arp_targets[i])
  				break;
  			if (printed)
  				seq_printf(seq, ",");
  			seq_printf(seq, " %pI4", &bond->params.arp_targets[i]);
  			printed = 1;
  		}
  		seq_printf(seq, "\n");
  	}
  
  	if (BOND_MODE(bond) == BOND_MODE_8023AD) {
  		struct ad_info ad_info;
  
  		seq_puts(seq, "\n802.3ad info\n");
  		seq_printf(seq, "LACP rate: %s\n",
  			   (bond->params.lacp_fast) ? "fast" : "slow");
  		seq_printf(seq, "Min links: %d\n", bond->params.min_links);
  		optval = bond_opt_get_val(BOND_OPT_AD_SELECT,
  					  bond->params.ad_select);
  		seq_printf(seq, "Aggregator selection policy (ad_select): %s\n",
  			   optval->string);
  		if (capable(CAP_NET_ADMIN)) {
  			seq_printf(seq, "System priority: %d\n",
  				   BOND_AD_INFO(bond).system.sys_priority);
  			seq_printf(seq, "System MAC address: %pM\n",
  				   &BOND_AD_INFO(bond).system.sys_mac_addr);
  
  			if (__bond_3ad_get_active_agg_info(bond, &ad_info)) {
  				seq_printf(seq,
  					   "bond %s has no active aggregator\n",
  					   bond->dev->name);
  			} else {
  				seq_printf(seq, "Active Aggregator Info:\n");
  
  				seq_printf(seq, "\tAggregator ID: %d\n",
  					   ad_info.aggregator_id);
  				seq_printf(seq, "\tNumber of ports: %d\n",
  					   ad_info.ports);
  				seq_printf(seq, "\tActor Key: %d\n",
  					   ad_info.actor_key);
  				seq_printf(seq, "\tPartner Key: %d\n",
  					   ad_info.partner_key);
  				seq_printf(seq, "\tPartner Mac Address: %pM\n",
  					   ad_info.partner_system);
  			}
  		}
  	}
  }
  
  static void bond_info_show_slave(struct seq_file *seq,
  				 const struct slave *slave)
  {
  	struct bonding *bond = seq->private;
  
  	seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
  	seq_printf(seq, "MII Status: %s\n", bond_slave_link_status(slave->link));
  	if (slave->speed == SPEED_UNKNOWN)
  		seq_printf(seq, "Speed: %s\n", "Unknown");
  	else
  		seq_printf(seq, "Speed: %d Mbps\n", slave->speed);
  
  	if (slave->duplex == DUPLEX_UNKNOWN)
  		seq_printf(seq, "Duplex: %s\n", "Unknown");
  	else
  		seq_printf(seq, "Duplex: %s\n", slave->duplex ? "full" : "half");
  
  	seq_printf(seq, "Link Failure Count: %u\n",
  		   slave->link_failure_count);
  
  	seq_printf(seq, "Permanent HW addr: %*phC\n",
  		   slave->dev->addr_len, slave->perm_hwaddr);
  	seq_printf(seq, "Slave queue ID: %d\n", slave->queue_id);
  
  	if (BOND_MODE(bond) == BOND_MODE_8023AD) {
  		const struct port *port = &SLAVE_AD_INFO(slave)->port;
  		const struct aggregator *agg = port->aggregator;
  
  		if (agg) {
  			seq_printf(seq, "Aggregator ID: %d\n",
  				   agg->aggregator_identifier);
  			seq_printf(seq, "Actor Churn State: %s\n",
  				   bond_3ad_churn_desc(port->sm_churn_actor_state));
  			seq_printf(seq, "Partner Churn State: %s\n",
  				   bond_3ad_churn_desc(port->sm_churn_partner_state));
  			seq_printf(seq, "Actor Churned Count: %d\n",
  				   port->churn_actor_count);
  			seq_printf(seq, "Partner Churned Count: %d\n",
  				   port->churn_partner_count);
  
  			if (capable(CAP_NET_ADMIN)) {
  				seq_puts(seq, "details actor lacp pdu:\n");
  				seq_printf(seq, "    system priority: %d\n",
  					   port->actor_system_priority);
  				seq_printf(seq, "    system mac address: %pM\n",
  					   &port->actor_system);
  				seq_printf(seq, "    port key: %d\n",
  					   port->actor_oper_port_key);
  				seq_printf(seq, "    port priority: %d\n",
  					   port->actor_port_priority);
  				seq_printf(seq, "    port number: %d\n",
  					   port->actor_port_number);
  				seq_printf(seq, "    port state: %d\n",
  					   port->actor_oper_port_state);
  
  				seq_puts(seq, "details partner lacp pdu:\n");
  				seq_printf(seq, "    system priority: %d\n",
  					   port->partner_oper.system_priority);
  				seq_printf(seq, "    system mac address: %pM\n",
  					   &port->partner_oper.system);
  				seq_printf(seq, "    oper key: %d\n",
  					   port->partner_oper.key);
  				seq_printf(seq, "    port priority: %d\n",
  					   port->partner_oper.port_priority);
  				seq_printf(seq, "    port number: %d\n",
  					   port->partner_oper.port_number);
  				seq_printf(seq, "    port state: %d\n",
  					   port->partner_oper.port_state);
  			}
  		} else {
  			seq_puts(seq, "Aggregator ID: N/A\n");
  		}
  	}
  }
  
  static int bond_info_seq_show(struct seq_file *seq, void *v)
  {
  	if (v == SEQ_START_TOKEN) {
  		seq_printf(seq, "%s\n", bond_version);
  		bond_info_show_master(seq);
  	} else
  		bond_info_show_slave(seq, v);
  
  	return 0;
  }
  
  static const struct seq_operations bond_info_seq_ops = {
  	.start = bond_info_seq_start,
  	.next  = bond_info_seq_next,
  	.stop  = bond_info_seq_stop,
  	.show  = bond_info_seq_show,
  };
  
  static int bond_info_open(struct inode *inode, struct file *file)
  {
  	struct seq_file *seq;
  	int res;
  
  	res = seq_open(file, &bond_info_seq_ops);
  	if (!res) {
  		/* recover the pointer buried in proc_dir_entry data */
  		seq = file->private_data;
  		seq->private = PDE_DATA(inode);
  	}
  
  	return res;
  }
  
  static const struct file_operations bond_info_fops = {
  	.owner   = THIS_MODULE,
  	.open    = bond_info_open,
  	.read    = seq_read,
  	.llseek  = seq_lseek,
  	.release = seq_release,
  };
  
  void bond_create_proc_entry(struct bonding *bond)
  {
  	struct net_device *bond_dev = bond->dev;
  	struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
  
  	if (bn->proc_dir) {
  		bond->proc_entry = proc_create_data(bond_dev->name,
  						    S_IRUGO, bn->proc_dir,
  						    &bond_info_fops, bond);
  		if (bond->proc_entry == NULL)
  			netdev_warn(bond_dev, "Cannot create /proc/net/%s/%s\n",
  				    DRV_NAME, bond_dev->name);
  		else
  			memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
  	}
  }
  
  void bond_remove_proc_entry(struct bonding *bond)
  {
  	struct net_device *bond_dev = bond->dev;
  	struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
  
  	if (bn->proc_dir && bond->proc_entry) {
  		remove_proc_entry(bond->proc_file_name, bn->proc_dir);
  		memset(bond->proc_file_name, 0, IFNAMSIZ);
  		bond->proc_entry = NULL;
  	}
  }
  
  /* Create the bonding directory under /proc/net, if doesn't exist yet.
   * Caller must hold rtnl_lock.
   */
  void __net_init bond_create_proc_dir(struct bond_net *bn)
  {
  	if (!bn->proc_dir) {
  		bn->proc_dir = proc_mkdir(DRV_NAME, bn->net->proc_net);
  		if (!bn->proc_dir)
  			pr_warn("Warning: Cannot create /proc/net/%s\n",
  				DRV_NAME);
  	}
  }
  
  /* Destroy the bonding directory under /proc/net, if empty.
   * Caller must hold rtnl_lock.
   */
  void __net_exit bond_destroy_proc_dir(struct bond_net *bn)
  {
  	if (bn->proc_dir) {
  		remove_proc_entry(DRV_NAME, bn->net->proc_net);
  		bn->proc_dir = NULL;
  	}
  }
  