atalk_proc.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * 	atalk_proc.c - proc support for Appletalk
  4 *
  5 * 	Copyright(c) Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  6 */
  7
  8#include <linux/init.h>
  9#include <linux/proc_fs.h>
 10#include <linux/seq_file.h>
 11#include <net/net_namespace.h>
 12#include <net/sock.h>
 13#include <linux/atalk.h>
 14#include <linux/export.h>
 15
 16
 17static __inline__ struct atalk_iface *atalk_get_interface_idx(loff_t pos)
 18{
 19	struct atalk_iface *i;
 20
 21	for (i = atalk_interfaces; pos && i; i = i->next)
 22		--pos;
 23
 24	return i;
 25}
 26
 27static void *atalk_seq_interface_start(struct seq_file *seq, loff_t *pos)
 28	__acquires(atalk_interfaces_lock)
 29{
 30	loff_t l = *pos;
 31
 32	read_lock_bh(&atalk_interfaces_lock);
 33	return l ? atalk_get_interface_idx(--l) : SEQ_START_TOKEN;
 34}
 35
 36static void *atalk_seq_interface_next(struct seq_file *seq, void *v, loff_t *pos)
 37{
 38	struct atalk_iface *i;
 39
 40	++*pos;
 41	if (v == SEQ_START_TOKEN) {
 42		i = NULL;
 43		if (atalk_interfaces)
 44			i = atalk_interfaces;
 45		goto out;
 46	}
 47	i = v;
 48	i = i->next;
 49out:
 50	return i;
 51}
 52
 53static void atalk_seq_interface_stop(struct seq_file *seq, void *v)
 54	__releases(atalk_interfaces_lock)
 55{
 56	read_unlock_bh(&atalk_interfaces_lock);
 57}
 58
 59static int atalk_seq_interface_show(struct seq_file *seq, void *v)
 60{
 61	struct atalk_iface *iface;
 62
 63	if (v == SEQ_START_TOKEN) {
 64		seq_puts(seq, "Interface        Address   Networks  "
 65			      "Status\n");
 66		goto out;
 67	}
 68
 69	iface = v;
 70	seq_printf(seq, "%-16s %04X:%02X  %04X-%04X  %d\n",
 71		   iface->dev->name, ntohs(iface->address.s_net),
 72		   iface->address.s_node, ntohs(iface->nets.nr_firstnet),
 73		   ntohs(iface->nets.nr_lastnet), iface->status);
 74out:
 75	return 0;
 76}
 77
 78static __inline__ struct atalk_route *atalk_get_route_idx(loff_t pos)
 79{
 80	struct atalk_route *r;
 81
 82	for (r = atalk_routes; pos && r; r = r->next)
 83		--pos;
 84
 85	return r;
 86}
 87
 88static void *atalk_seq_route_start(struct seq_file *seq, loff_t *pos)
 89	__acquires(atalk_routes_lock)
 90{
 91	loff_t l = *pos;
 92
 93	read_lock_bh(&atalk_routes_lock);
 94	return l ? atalk_get_route_idx(--l) : SEQ_START_TOKEN;
 95}
 96
 97static void *atalk_seq_route_next(struct seq_file *seq, void *v, loff_t *pos)
 98{
 99	struct atalk_route *r;
100
101	++*pos;
102	if (v == SEQ_START_TOKEN) {
103		r = NULL;
104		if (atalk_routes)
105			r = atalk_routes;
106		goto out;
107	}
108	r = v;
109	r = r->next;
110out:
111	return r;
112}
113
114static void atalk_seq_route_stop(struct seq_file *seq, void *v)
115	__releases(atalk_routes_lock)
116{
117	read_unlock_bh(&atalk_routes_lock);
118}
119
120static int atalk_seq_route_show(struct seq_file *seq, void *v)
121{
122	struct atalk_route *rt;
123
124	if (v == SEQ_START_TOKEN) {
125		seq_puts(seq, "Target        Router  Flags Dev\n");
126		goto out;
127	}
128
129	if (atrtr_default.dev) {
130		rt = &atrtr_default;
131		seq_printf(seq, "Default     %04X:%02X  %-4d  %s\n",
132			       ntohs(rt->gateway.s_net), rt->gateway.s_node,
133			       rt->flags, rt->dev->name);
134	}
135
136	rt = v;
137	seq_printf(seq, "%04X:%02X     %04X:%02X  %-4d  %s\n",
138		   ntohs(rt->target.s_net), rt->target.s_node,
139		   ntohs(rt->gateway.s_net), rt->gateway.s_node,
140		   rt->flags, rt->dev->name);
141out:
142	return 0;
143}
144
145static void *atalk_seq_socket_start(struct seq_file *seq, loff_t *pos)
146	__acquires(atalk_sockets_lock)
147{
148	read_lock_bh(&atalk_sockets_lock);
149	return seq_hlist_start_head(&atalk_sockets, *pos);
150}
151
152static void *atalk_seq_socket_next(struct seq_file *seq, void *v, loff_t *pos)
153{
154	return seq_hlist_next(v, &atalk_sockets, pos);
155}
156
157static void atalk_seq_socket_stop(struct seq_file *seq, void *v)
158	__releases(atalk_sockets_lock)
159{
160	read_unlock_bh(&atalk_sockets_lock);
161}
162
163static int atalk_seq_socket_show(struct seq_file *seq, void *v)
164{
165	struct sock *s;
166	struct atalk_sock *at;
167
168	if (v == SEQ_START_TOKEN) {
169		seq_printf(seq, "Type Local_addr  Remote_addr Tx_queue "
170				"Rx_queue St UID\n");
171		goto out;
172	}
173
174	s = sk_entry(v);
175	at = at_sk(s);
176
177	seq_printf(seq, "%02X   %04X:%02X:%02X  %04X:%02X:%02X  %08X:%08X "
178			"%02X %u\n",
179		   s->sk_type, ntohs(at->src_net), at->src_node, at->src_port,
180		   ntohs(at->dest_net), at->dest_node, at->dest_port,
181		   sk_wmem_alloc_get(s),
182		   sk_rmem_alloc_get(s),
183		   s->sk_state,
184		   from_kuid_munged(seq_user_ns(seq), sk_uid(s)));
185out:
186	return 0;
187}
188
189static const struct seq_operations atalk_seq_interface_ops = {
190	.start  = atalk_seq_interface_start,
191	.next   = atalk_seq_interface_next,
192	.stop   = atalk_seq_interface_stop,
193	.show   = atalk_seq_interface_show,
194};
195
196static const struct seq_operations atalk_seq_route_ops = {
197	.start  = atalk_seq_route_start,
198	.next   = atalk_seq_route_next,
199	.stop   = atalk_seq_route_stop,
200	.show   = atalk_seq_route_show,
201};
202
203static const struct seq_operations atalk_seq_socket_ops = {
204	.start  = atalk_seq_socket_start,
205	.next   = atalk_seq_socket_next,
206	.stop   = atalk_seq_socket_stop,
207	.show   = atalk_seq_socket_show,
208};
209
210int __init atalk_proc_init(void)
211{
212	if (!proc_mkdir("atalk", init_net.proc_net))
213		return -ENOMEM;
214
215	if (!proc_create_seq("atalk/interface", 0444, init_net.proc_net,
216			    &atalk_seq_interface_ops))
217		goto out;
218
219	if (!proc_create_seq("atalk/route", 0444, init_net.proc_net,
220			    &atalk_seq_route_ops))
221		goto out;
222
223	if (!proc_create_seq("atalk/socket", 0444, init_net.proc_net,
224			    &atalk_seq_socket_ops))
225		goto out;
226
227	if (!proc_create_seq_private("atalk/arp", 0444, init_net.proc_net,
228				     &aarp_seq_ops,
229				     sizeof(struct aarp_iter_state), NULL))
230		goto out;
231
232	return 0;
233
234out:
235	remove_proc_subtree("atalk", init_net.proc_net);
236	return -ENOMEM;
237}
238
239void atalk_proc_exit(void)
240{
241	remove_proc_subtree("atalk", init_net.proc_net);
242}