// SPDX-License-Identifier: GPL-2.0-only

  /*
   * 	atalk_proc.c - proc support for Appletalk
   *
   * 	Copyright(c) Arnaldo Carvalho de Melo <acme@conectiva.com.br>

   */

  #include <linux/init.h>
  #include <linux/proc_fs.h>
  #include <linux/seq_file.h>

  #include <net/net_namespace.h>

  #include <net/sock.h>
  #include <linux/atalk.h>

  #include <linux/export.h>

  
  
  static __inline__ struct atalk_iface *atalk_get_interface_idx(loff_t pos)
  {
  	struct atalk_iface *i;
  
  	for (i = atalk_interfaces; pos && i; i = i->next)
  		--pos;
  
  	return i;
  }
  
  static void *atalk_seq_interface_start(struct seq_file *seq, loff_t *pos)

  	__acquires(atalk_interfaces_lock)

  {
  	loff_t l = *pos;
  
  	read_lock_bh(&atalk_interfaces_lock);
  	return l ? atalk_get_interface_idx(--l) : SEQ_START_TOKEN;
  }
  
  static void *atalk_seq_interface_next(struct seq_file *seq, void *v, loff_t *pos)
  {
  	struct atalk_iface *i;
  
  	++*pos;
  	if (v == SEQ_START_TOKEN) {
  		i = NULL;
  		if (atalk_interfaces)
  			i = atalk_interfaces;
  		goto out;
  	}
  	i = v;
  	i = i->next;
  out:
  	return i;
  }
  
  static void atalk_seq_interface_stop(struct seq_file *seq, void *v)

  	__releases(atalk_interfaces_lock)

  {
  	read_unlock_bh(&atalk_interfaces_lock);
  }
  
  static int atalk_seq_interface_show(struct seq_file *seq, void *v)
  {
  	struct atalk_iface *iface;
  
  	if (v == SEQ_START_TOKEN) {
  		seq_puts(seq, "Interface        Address   Networks  "
  			      "Status
  ");
  		goto out;
  	}
  
  	iface = v;
  	seq_printf(seq, "%-16s %04X:%02X  %04X-%04X  %d
  ",
  		   iface->dev->name, ntohs(iface->address.s_net),
  		   iface->address.s_node, ntohs(iface->nets.nr_firstnet),
  		   ntohs(iface->nets.nr_lastnet), iface->status);
  out:
  	return 0;
  }
  
  static __inline__ struct atalk_route *atalk_get_route_idx(loff_t pos)
  {
  	struct atalk_route *r;
  
  	for (r = atalk_routes; pos && r; r = r->next)
  		--pos;
  
  	return r;
  }
  
  static void *atalk_seq_route_start(struct seq_file *seq, loff_t *pos)

  	__acquires(atalk_routes_lock)

  {
  	loff_t l = *pos;
  
  	read_lock_bh(&atalk_routes_lock);
  	return l ? atalk_get_route_idx(--l) : SEQ_START_TOKEN;
  }
  
  static void *atalk_seq_route_next(struct seq_file *seq, void *v, loff_t *pos)
  {
  	struct atalk_route *r;
  
  	++*pos;
  	if (v == SEQ_START_TOKEN) {
  		r = NULL;
  		if (atalk_routes)
  			r = atalk_routes;
  		goto out;
  	}
  	r = v;
  	r = r->next;
  out:
  	return r;
  }
  
  static void atalk_seq_route_stop(struct seq_file *seq, void *v)

  	__releases(atalk_routes_lock)

  {
  	read_unlock_bh(&atalk_routes_lock);
  }
  
  static int atalk_seq_route_show(struct seq_file *seq, void *v)
  {
  	struct atalk_route *rt;
  
  	if (v == SEQ_START_TOKEN) {
  		seq_puts(seq, "Target        Router  Flags Dev
  ");
  		goto out;
  	}
  
  	if (atrtr_default.dev) {
  		rt = &atrtr_default;
  		seq_printf(seq, "Default     %04X:%02X  %-4d  %s
  ",
  			       ntohs(rt->gateway.s_net), rt->gateway.s_node,
  			       rt->flags, rt->dev->name);
  	}
  
  	rt = v;
  	seq_printf(seq, "%04X:%02X     %04X:%02X  %-4d  %s
  ",
  		   ntohs(rt->target.s_net), rt->target.s_node,
  		   ntohs(rt->gateway.s_net), rt->gateway.s_node,
  		   rt->flags, rt->dev->name);
  out:
  	return 0;
  }

  static void *atalk_seq_socket_start(struct seq_file *seq, loff_t *pos)

  	__acquires(atalk_sockets_lock)

  {

  	read_lock_bh(&atalk_sockets_lock);

  	return seq_hlist_start_head(&atalk_sockets, *pos);

  }
  
  static void *atalk_seq_socket_next(struct seq_file *seq, void *v, loff_t *pos)
  {

  	return seq_hlist_next(v, &atalk_sockets, pos);

  }
  
  static void atalk_seq_socket_stop(struct seq_file *seq, void *v)

  	__releases(atalk_sockets_lock)

  {
  	read_unlock_bh(&atalk_sockets_lock);
  }
  
  static int atalk_seq_socket_show(struct seq_file *seq, void *v)
  {
  	struct sock *s;
  	struct atalk_sock *at;
  
  	if (v == SEQ_START_TOKEN) {
  		seq_printf(seq, "Type Local_addr  Remote_addr Tx_queue "
  				"Rx_queue St UID
  ");
  		goto out;
  	}

  	s = sk_entry(v);

  	at = at_sk(s);
  
  	seq_printf(seq, "%02X   %04X:%02X:%02X  %04X:%02X:%02X  %08X:%08X "

  			"%02X %u
  ",

  		   s->sk_type, ntohs(at->src_net), at->src_node, at->src_port,
  		   ntohs(at->dest_net), at->dest_node, at->dest_port,

  		   sk_wmem_alloc_get(s),
  		   sk_rmem_alloc_get(s),

  		   s->sk_state,
  		   from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)));

  out:
  	return 0;
  }

  static const struct seq_operations atalk_seq_interface_ops = {

  	.start  = atalk_seq_interface_start,
  	.next   = atalk_seq_interface_next,
  	.stop   = atalk_seq_interface_stop,
  	.show   = atalk_seq_interface_show,
  };

  static const struct seq_operations atalk_seq_route_ops = {

  	.start  = atalk_seq_route_start,
  	.next   = atalk_seq_route_next,
  	.stop   = atalk_seq_route_stop,
  	.show   = atalk_seq_route_show,
  };

  static const struct seq_operations atalk_seq_socket_ops = {

  	.start  = atalk_seq_socket_start,
  	.next   = atalk_seq_socket_next,
  	.stop   = atalk_seq_socket_stop,
  	.show   = atalk_seq_socket_show,
  };

  int __init atalk_proc_init(void)
  {

  	if (!proc_mkdir("atalk", init_net.proc_net))
  		return -ENOMEM;

  	if (!proc_create_seq("atalk/interface", 0444, init_net.proc_net,
  			    &atalk_seq_interface_ops))

  		goto out;

  	if (!proc_create_seq("atalk/route", 0444, init_net.proc_net,
  			    &atalk_seq_route_ops))
  		goto out;

  	if (!proc_create_seq("atalk/socket", 0444, init_net.proc_net,
  			    &atalk_seq_socket_ops))
  		goto out;

  	if (!proc_create_seq_private("atalk/arp", 0444, init_net.proc_net,
  				     &aarp_seq_ops,
  				     sizeof(struct aarp_iter_state), NULL))
  		goto out;

  	return 0;

  out:

  	remove_proc_subtree("atalk", init_net.proc_net);
  	return -ENOMEM;

  }

  void atalk_proc_exit(void)

  {

  	remove_proc_subtree("atalk", init_net.proc_net);

  }