[linux-block.git] / net / llc / llc_proc.c

/*
 * proc_llc.c - proc interface for LLC
 *
 * Copyright (c) 2001 by Jay Schulist <jschlst@samba.org>
 *		 2002-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 *
 * This program can be redistributed or modified under the terms of the
 * GNU General Public License as published by the Free Software Foundation.
 * This program is distributed without any warranty or implied warranty
 * of merchantability or fitness for a particular purpose.
 *
 * See the GNU General Public License for more details.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/proc_fs.h>
#include <linux/errno.h>
#include <linux/seq_file.h>
#include <linux/export.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/llc.h>
#include <net/llc_c_ac.h>
#include <net/llc_c_ev.h>
#include <net/llc_c_st.h>
#include <net/llc_conn.h>

static void llc_ui_format_mac(struct seq_file *seq, const u8 *addr)
{
	seq_printf(seq, "%pM", addr);
}

static struct sock *llc_get_sk_idx(loff_t pos)
{
	struct llc_sap *sap;
	struct sock *sk = NULL;
	int i;

	list_for_each_entry_rcu(sap, &llc_sap_list, node) {
		spin_lock_bh(&sap->sk_lock);
		for (i = 0; i < LLC_SK_LADDR_HASH_ENTRIES; i++) {
			struct hlist_nulls_head *head = &sap->sk_laddr_hash[i];
			struct hlist_nulls_node *node;

			sk_nulls_for_each(sk, node, head) {
				if (!pos)
					goto found; /* keep the lock */
				--pos;
			}
		}
		spin_unlock_bh(&sap->sk_lock);
	}
	sk = NULL;
found:
	return sk;
}

static void *llc_seq_start(struct seq_file *seq, loff_t *pos) __acquires(RCU)
{
	loff_t l = *pos;

	rcu_read_lock_bh();
	return l ? llc_get_sk_idx(--l) : SEQ_START_TOKEN;
}

static struct sock *laddr_hash_next(struct llc_sap *sap, int bucket)
{
	struct hlist_nulls_node *node;
	struct sock *sk = NULL;

	while (++bucket < LLC_SK_LADDR_HASH_ENTRIES)
		sk_nulls_for_each(sk, node, &sap->sk_laddr_hash[bucket])
			goto out;

out:
	return sk;
}

static void *llc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	struct sock* sk, *next;
	struct llc_sock *llc;
	struct llc_sap *sap;

	++*pos;
	if (v == SEQ_START_TOKEN) {
		sk = llc_get_sk_idx(0);
		goto out;
	}
	sk = v;
	next = sk_nulls_next(sk);
	if (next) {
		sk = next;
		goto out;
	}
	llc = llc_sk(sk);
	sap = llc->sap;
	sk = laddr_hash_next(sap, llc_sk_laddr_hashfn(sap, &llc->laddr));
	if (sk)
		goto out;
	spin_unlock_bh(&sap->sk_lock);
	list_for_each_entry_continue_rcu(sap, &llc_sap_list, node) {
		spin_lock_bh(&sap->sk_lock);
		sk = laddr_hash_next(sap, -1);
		if (sk)
			break; /* keep the lock */
		spin_unlock_bh(&sap->sk_lock);
	}
out:
	return sk;
}

static void llc_seq_stop(struct seq_file *seq, void *v)
{
	if (v && v != SEQ_START_TOKEN) {
		struct sock *sk = v;
		struct llc_sock *llc = llc_sk(sk);
		struct llc_sap *sap = llc->sap;

		spin_unlock_bh(&sap->sk_lock);
	}
	rcu_read_unlock_bh();
}

static int llc_seq_socket_show(struct seq_file *seq, void *v)
{
	struct sock* sk;
	struct llc_sock *llc;

	if (v == SEQ_START_TOKEN) {
		seq_puts(seq, "SKt Mc local_mac_sap        remote_mac_sap   "
			      "    tx_queue rx_queue st uid link\n");
		goto out;
	}
	sk = v;
	llc = llc_sk(sk);

	/* FIXME: check if the address is multicast */
	seq_printf(seq, "%2X  %2X ", sk->sk_type, 0);

	if (llc->dev)
		llc_ui_format_mac(seq, llc->dev->dev_addr);
	else {
		u8 addr[6] = {0,0,0,0,0,0};
		llc_ui_format_mac(seq, addr);
	}
	seq_printf(seq, "@%02X ", llc->sap->laddr.lsap);
	llc_ui_format_mac(seq, llc->daddr.mac);
	seq_printf(seq, "@%02X %8d %8d %2d %3u %4d\n", llc->daddr.lsap,
		   sk_wmem_alloc_get(sk),
		   sk_rmem_alloc_get(sk) - llc->copied_seq,
		   sk->sk_state,
		   from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
		   llc->link);
out:
	return 0;
}

static const char *const llc_conn_state_names[] = {
	[LLC_CONN_STATE_ADM] =        "adm",
	[LLC_CONN_STATE_SETUP] =      "setup",
	[LLC_CONN_STATE_NORMAL] =     "normal",
	[LLC_CONN_STATE_BUSY] =       "busy",
	[LLC_CONN_STATE_REJ] =        "rej",
	[LLC_CONN_STATE_AWAIT] =      "await",
	[LLC_CONN_STATE_AWAIT_BUSY] = "await_busy",
	[LLC_CONN_STATE_AWAIT_REJ] =  "await_rej",
	[LLC_CONN_STATE_D_CONN]	=     "d_conn",
	[LLC_CONN_STATE_RESET] =      "reset",
	[LLC_CONN_STATE_ERROR] =      "error",
	[LLC_CONN_STATE_TEMP] =       "temp",
};

static int llc_seq_core_show(struct seq_file *seq, void *v)
{
	struct sock* sk;
	struct llc_sock *llc;

	if (v == SEQ_START_TOKEN) {
		seq_puts(seq, "Connection list:\n"
			      "dsap state      retr txw rxw pf ff sf df rs cs "
			      "tack tpfc trs tbs blog busr\n");
		goto out;
	}
	sk = v;
	llc = llc_sk(sk);

	seq_printf(seq, " %02X  %-10s %3d  %3d %3d %2d %2d %2d %2d %2d %2d "
			"%4d %4d %3d %3d %4d %4d\n",
		   llc->daddr.lsap, llc_conn_state_names[llc->state],
		   llc->retry_count, llc->k, llc->rw, llc->p_flag, llc->f_flag,
		   llc->s_flag, llc->data_flag, llc->remote_busy_flag,
		   llc->cause_flag, timer_pending(&llc->ack_timer.timer),
		   timer_pending(&llc->pf_cycle_timer.timer),
		   timer_pending(&llc->rej_sent_timer.timer),
		   timer_pending(&llc->busy_state_timer.timer),
		   !!sk->sk_backlog.tail, sock_owned_by_user_nocheck(sk));
out:
	return 0;
}

static const struct seq_operations llc_seq_socket_ops = {
	.start  = llc_seq_start,
	.next   = llc_seq_next,
	.stop   = llc_seq_stop,
	.show   = llc_seq_socket_show,
};

static const struct seq_operations llc_seq_core_ops = {
	.start  = llc_seq_start,
	.next   = llc_seq_next,
	.stop   = llc_seq_stop,
	.show   = llc_seq_core_show,
};

static struct proc_dir_entry *llc_proc_dir;

int __init llc_proc_init(void)
{
	int rc = -ENOMEM;
	struct proc_dir_entry *p;

	llc_proc_dir = proc_mkdir("llc", init_net.proc_net);
	if (!llc_proc_dir)
		goto out;

	p = proc_create_seq("socket", 0444, llc_proc_dir, &llc_seq_socket_ops);
	if (!p)
		goto out_socket;

	p = proc_create_seq("core", 0444, llc_proc_dir, &llc_seq_core_ops);
	if (!p)
		goto out_core;

	rc = 0;
out:
	return rc;
out_core:
	remove_proc_entry("socket", llc_proc_dir);
out_socket:
	remove_proc_entry("llc", init_net.proc_net);
	goto out;
}

void llc_proc_exit(void)
{
	remove_proc_entry("socket", llc_proc_dir);
	remove_proc_entry("core", llc_proc_dir);
	remove_proc_entry("llc", init_net.proc_net);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* proc_llc.c - proc interface for LLC
	3	*
	4	* Copyright (c) 2001 by Jay Schulist <jschlst@samba.org>
	5	* 2002-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
	6	*
	7	* This program can be redistributed or modified under the terms of the
	8	* GNU General Public License as published by the Free Software Foundation.
	9	* This program is distributed without any warranty or implied warranty
	10	* of merchantability or fitness for a particular purpose.
	11	*
	12	* See the GNU General Public License for more details.
	13	*/
	14
1da177e4 LT	15	#include <linux/init.h>
	16	#include <linux/kernel.h>
	17	#include <linux/proc_fs.h>
	18	#include <linux/errno.h>
	19	#include <linux/seq_file.h>
bc3b2d7f	20	#include <linux/export.h>
457c4cbc	21	#include <net/net_namespace.h>
1da177e4 LT	22	#include <net/sock.h>
	23	#include <net/llc.h>
	24	#include <net/llc_c_ac.h>
	25	#include <net/llc_c_ev.h>
	26	#include <net/llc_c_st.h>
	27	#include <net/llc_conn.h>
	28
2ef6db76	29	static void llc_ui_format_mac(struct seq_file seq, const u8 addr)
1da177e4	30	{
e174961c	31	seq_printf(seq, "%pM", addr);
1da177e4 LT	32	}
	33
	34	static struct sock *llc_get_sk_idx(loff_t pos)
	35	{
1da177e4	36	struct llc_sap *sap;
1da177e4	37	struct sock *sk = NULL;
52d58aef	38	int i;
1da177e4	39
8beb9ab6	40	list_for_each_entry_rcu(sap, &llc_sap_list, node) {
b76f5a84	41	spin_lock_bh(&sap->sk_lock);
52d58aef OP	42	for (i = 0; i < LLC_SK_LADDR_HASH_ENTRIES; i++) {
	43	struct hlist_nulls_head *head = &sap->sk_laddr_hash[i];
	44	struct hlist_nulls_node *node;
	45
	46	sk_nulls_for_each(sk, node, head) {
	47	if (!pos)
	48	goto found; /* keep the lock */
	49	--pos;
	50	}
1da177e4	51	}
b76f5a84	52	spin_unlock_bh(&sap->sk_lock);
1da177e4 LT	53	}
	54	sk = NULL;
	55	found:
	56	return sk;
	57	}
	58
8e0f8ccf	59	static void llc_seq_start(struct seq_file seq, loff_t *pos) __acquires(RCU)
1da177e4 LT	60	{
	61	loff_t l = *pos;
	62
8beb9ab6	63	rcu_read_lock_bh();
1da177e4 LT	64	return l ? llc_get_sk_idx(--l) : SEQ_START_TOKEN;
	65	}
	66
52d58aef OP	67	static struct sock laddr_hash_next(struct llc_sap sap, int bucket)
	68	{
	69	struct hlist_nulls_node *node;
	70	struct sock *sk = NULL;
	71
	72	while (++bucket < LLC_SK_LADDR_HASH_ENTRIES)
	73	sk_nulls_for_each(sk, node, &sap->sk_laddr_hash[bucket])
	74	goto out;
	75
	76	out:
	77	return sk;
	78	}
	79
1da177e4 LT	80	static void llc_seq_next(struct seq_file seq, void v, loff_t pos)
	81	{
	82	struct sock* sk, *next;
	83	struct llc_sock *llc;
	84	struct llc_sap *sap;
	85
	86	++*pos;
	87	if (v == SEQ_START_TOKEN) {
	88	sk = llc_get_sk_idx(0);
	89	goto out;
	90	}
	91	sk = v;
b76f5a84	92	next = sk_nulls_next(sk);
1da177e4 LT	93	if (next) {
	94	sk = next;
	95	goto out;
	96	}
	97	llc = llc_sk(sk);
	98	sap = llc->sap;
52d58aef OP	99	sk = laddr_hash_next(sap, llc_sk_laddr_hashfn(sap, &llc->laddr));
	100	if (sk)
	101	goto out;
b76f5a84	102	spin_unlock_bh(&sap->sk_lock);
8beb9ab6	103	list_for_each_entry_continue_rcu(sap, &llc_sap_list, node) {
b76f5a84	104	spin_lock_bh(&sap->sk_lock);
52d58aef OP	105	sk = laddr_hash_next(sap, -1);
	106	if (sk)
	107	break; /* keep the lock */
b76f5a84	108	spin_unlock_bh(&sap->sk_lock);
1da177e4 LT	109	}
	110	out:
	111	return sk;
	112	}
	113
	114	static void llc_seq_stop(struct seq_file seq, void v)
	115	{
	116	if (v && v != SEQ_START_TOKEN) {
	117	struct sock *sk = v;
	118	struct llc_sock *llc = llc_sk(sk);
	119	struct llc_sap *sap = llc->sap;
	120
b76f5a84	121	spin_unlock_bh(&sap->sk_lock);
1da177e4	122	}
8beb9ab6	123	rcu_read_unlock_bh();
1da177e4 LT	124	}
	125
	126	static int llc_seq_socket_show(struct seq_file seq, void v)
	127	{
	128	struct sock* sk;
	129	struct llc_sock *llc;
	130
	131	if (v == SEQ_START_TOKEN) {
	132	seq_puts(seq, "SKt Mc local_mac_sap remote_mac_sap "
	133	" tx_queue rx_queue st uid link\n");
	134	goto out;
	135	}
	136	sk = v;
	137	llc = llc_sk(sk);
	138
	139	/* FIXME: check if the address is multicast */
	140	seq_printf(seq, "%2X %2X ", sk->sk_type, 0);
	141
	142	if (llc->dev)
	143	llc_ui_format_mac(seq, llc->dev->dev_addr);
0795af57 JP	144	else {
	145	u8 addr[6] = {0,0,0,0,0,0};
	146	llc_ui_format_mac(seq, addr);
	147	}
1da177e4 LT	148	seq_printf(seq, "@%02X ", llc->sap->laddr.lsap);
1da177e4 LT	149	llc_ui_format_mac(seq, llc->daddr.mac);
d14c5ab6	150	seq_printf(seq, "@%02X %8d %8d %2d %3u %4d\n", llc->daddr.lsap,
31e6d363 ED	151	sk_wmem_alloc_get(sk),
31e6d363 ED	152	sk_rmem_alloc_get(sk) - llc->copied_seq,
1da177e4	153	sk->sk_state,
a7cb5a49	154	from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
1da177e4 LT	155	llc->link);
	156	out:
	157	return 0;
	158	}
	159
36cbd3dc	160	static const char *const llc_conn_state_names[] = {
d57b1869 YH	161	[LLC_CONN_STATE_ADM] = "adm",
d57b1869 YH	162	[LLC_CONN_STATE_SETUP] = "setup",
1da177e4	163	[LLC_CONN_STATE_NORMAL] = "normal",
d57b1869 YH	164	[LLC_CONN_STATE_BUSY] = "busy",
	165	[LLC_CONN_STATE_REJ] = "rej",
	166	[LLC_CONN_STATE_AWAIT] = "await",
1da177e4 LT	167	[LLC_CONN_STATE_AWAIT_BUSY] = "await_busy",
	168	[LLC_CONN_STATE_AWAIT_REJ] = "await_rej",
	169	[LLC_CONN_STATE_D_CONN] = "d_conn",
d57b1869 YH	170	[LLC_CONN_STATE_RESET] = "reset",
	171	[LLC_CONN_STATE_ERROR] = "error",
	172	[LLC_CONN_STATE_TEMP] = "temp",
1da177e4 LT	173	};
	174
	175	static int llc_seq_core_show(struct seq_file seq, void v)
	176	{
	177	struct sock* sk;
	178	struct llc_sock *llc;
	179
	180	if (v == SEQ_START_TOKEN) {
	181	seq_puts(seq, "Connection list:\n"
	182	"dsap state retr txw rxw pf ff sf df rs cs "
	183	"tack tpfc trs tbs blog busr\n");
	184	goto out;
	185	}
	186	sk = v;
	187	llc = llc_sk(sk);
	188
	189	seq_printf(seq, " %02X %-10s %3d %3d %3d %2d %2d %2d %2d %2d %2d "
	190	"%4d %4d %3d %3d %4d %4d\n",
	191	llc->daddr.lsap, llc_conn_state_names[llc->state],
	192	llc->retry_count, llc->k, llc->rw, llc->p_flag, llc->f_flag,
	193	llc->s_flag, llc->data_flag, llc->remote_busy_flag,
	194	llc->cause_flag, timer_pending(&llc->ack_timer.timer),
	195	timer_pending(&llc->pf_cycle_timer.timer),
	196	timer_pending(&llc->rej_sent_timer.timer),
	197	timer_pending(&llc->busy_state_timer.timer),
33d60fbd	198	!!sk->sk_backlog.tail, sock_owned_by_user_nocheck(sk));
1da177e4 LT	199	out:
	200	return 0;
	201	}
	202
56b3d975	203	static const struct seq_operations llc_seq_socket_ops = {
1da177e4 LT	204	.start = llc_seq_start,
	205	.next = llc_seq_next,
	206	.stop = llc_seq_stop,
	207	.show = llc_seq_socket_show,
	208	};
	209
56b3d975	210	static const struct seq_operations llc_seq_core_ops = {
1da177e4 LT	211	.start = llc_seq_start,
	212	.next = llc_seq_next,
	213	.stop = llc_seq_stop,
	214	.show = llc_seq_core_show,
	215	};
	216
1da177e4 LT	217	static struct proc_dir_entry *llc_proc_dir;
	218
	219	int __init llc_proc_init(void)
	220	{
	221	int rc = -ENOMEM;
	222	struct proc_dir_entry *p;
	223
457c4cbc	224	llc_proc_dir = proc_mkdir("llc", init_net.proc_net);
1da177e4 LT	225	if (!llc_proc_dir)
1da177e4 LT	226	goto out;
1da177e4	227
fddda2b7	228	p = proc_create_seq("socket", 0444, llc_proc_dir, &llc_seq_socket_ops);
1da177e4 LT	229	if (!p)
	230	goto out_socket;
	231
fddda2b7	232	p = proc_create_seq("core", 0444, llc_proc_dir, &llc_seq_core_ops);
1da177e4 LT	233	if (!p)
	234	goto out_core;
	235
1da177e4 LT	236	rc = 0;
	237	out:
	238	return rc;
	239	out_core:
	240	remove_proc_entry("socket", llc_proc_dir);
	241	out_socket:
457c4cbc	242	remove_proc_entry("llc", init_net.proc_net);
1da177e4 LT	243	goto out;
	244	}
	245
	246	void llc_proc_exit(void)
	247	{
	248	remove_proc_entry("socket", llc_proc_dir);
	249	remove_proc_entry("core", llc_proc_dir);
457c4cbc	250	remove_proc_entry("llc", init_net.proc_net);
1da177e4	251	}