net/atm/proc.c - kernel/msm-5.4 - Gitiles

 // SPDX-License-Identifier: GPL-2.0
 /* net/atm/proc.c - ATM /proc interface
  *
  * Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA
  *
  * seq_file api usage by romieu@fr.zoreil.com
  *
  * Evaluating the efficiency of the whole thing if left as an exercise to
  * the reader.
  */

 #include <linux/module.h> /* for EXPORT_SYMBOL */
 #include <linux/string.h>
 #include <linux/types.h>
 #include <linux/mm.h>
 #include <linux/fs.h>
 #include <linux/stat.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/errno.h>
 #include <linux/atm.h>
 #include <linux/atmdev.h>
 #include <linux/netdevice.h>
 #include <linux/atmclip.h>
 #include <linux/init.h> /* for __init */
 #include <linux/slab.h>
 #include <net/net_namespace.h>
 #include <net/atmclip.h>
 #include <linux/uaccess.h>
 #include <linux/param.h> /* for HZ */
 #include <linux/atomic.h>
 #include "resources.h"
 #include "common.h" /* atm_proc_init prototype */
 #include "signaling.h" /* to get sigd - ugly too */

 static ssize_t proc_dev_atm_read(struct file *file, char __user *buf,
 				 size_t count, loff_t *pos);

 static const struct file_operations proc_atm_dev_ops = {
 	.read =		proc_dev_atm_read,
 	.llseek =	noop_llseek,
 };

 static void add_stats(struct seq_file *seq, const char *aal,
   const struct k_atm_aal_stats *stats)
 {
 	seq_printf(seq, "%s ( %d %d %d %d %d )", aal,
 		   atomic_read(&stats->tx), atomic_read(&stats->tx_err),
 		   atomic_read(&stats->rx), atomic_read(&stats->rx_err),
 		   atomic_read(&stats->rx_drop));
 }

 static void atm_dev_info(struct seq_file *seq, const struct atm_dev *dev)
 {
 	int i;

 	seq_printf(seq, "%3d %-8s", dev->number, dev->type);
 	for (i = 0; i < ESI_LEN; i++)
 		seq_printf(seq, "%02x", dev->esi[i]);
 	seq_puts(seq, "  ");
 	add_stats(seq, "0", &dev->stats.aal0);
 	seq_puts(seq, "  ");
 	add_stats(seq, "5", &dev->stats.aal5);
 	seq_printf(seq, "\t[%d]", refcount_read(&dev->refcnt));
 	seq_putc(seq, '\n');
 }

 struct vcc_state {
 	int bucket;
 	struct sock *sk;
 	int family;
 };

 static inline int compare_family(struct sock *sk, int family)
 {
 	return !family || (sk->sk_family == family);
 }

 static int __vcc_walk(struct sock **sock, int family, int *bucket, loff_t l)
 {
 	struct sock *sk = *sock;

 	if (sk == SEQ_START_TOKEN) {
 		for (*bucket = 0; *bucket < VCC_HTABLE_SIZE; ++*bucket) {
 			struct hlist_head *head = &vcc_hash[*bucket];

 			sk = hlist_empty(head) ? NULL : __sk_head(head);
 			if (sk)
 				break;
 		}
 		l--;
 	}
 try_again:
 	for (; sk; sk = sk_next(sk)) {
 		l -= compare_family(sk, family);
 		if (l < 0)
 			goto out;
 	}
 	if (!sk && ++*bucket < VCC_HTABLE_SIZE) {
 		sk = sk_head(&vcc_hash[*bucket]);
 		goto try_again;
 	}
 	sk = SEQ_START_TOKEN;
 out:
 	*sock = sk;
 	return (l < 0);
 }

 static inline void *vcc_walk(struct vcc_state *state, loff_t l)
 {
 	return __vcc_walk(&state->sk, state->family, &state->bucket, l) ?
 	       state : NULL;
 }

 static int __vcc_seq_open(struct inode *inode, struct file *file,
 	int family, const struct seq_operations *ops)
 {
 	struct vcc_state *state;

 	state = __seq_open_private(file, ops, sizeof(*state));
 	if (state == NULL)
 		return -ENOMEM;

 	state->family = family;
 	return 0;
 }

 static void *vcc_seq_start(struct seq_file *seq, loff_t *pos)
 	__acquires(vcc_sklist_lock)
 {
 	struct vcc_state *state = seq->private;
 	loff_t left = *pos;

 	read_lock(&vcc_sklist_lock);
 	state->sk = SEQ_START_TOKEN;
 	return left ? vcc_walk(state, left) : SEQ_START_TOKEN;
 }

 static void vcc_seq_stop(struct seq_file *seq, void *v)
 	__releases(vcc_sklist_lock)
 {
 	read_unlock(&vcc_sklist_lock);
 }

 static void *vcc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
 	struct vcc_state *state = seq->private;

 	v = vcc_walk(state, 1);
 	*pos += !!PTR_ERR(v);
 	return v;
 }

 static void pvc_info(struct seq_file *seq, struct atm_vcc *vcc)
 {
 	static const char *const class_name[] = {
 		"off", "UBR", "CBR", "VBR", "ABR"};
 	static const char *const aal_name[] = {
 		"---",	"1",	"2",	"3/4",	/*  0- 3 */
 		"???",	"5",	"???",	"???",	/*  4- 7 */
 		"???",	"???",	"???",	"???",	/*  8-11 */
 		"???",	"0",	"???",	"???"};	/* 12-15 */

 	seq_printf(seq, "%3d %3d %5d %-3s %7d %-5s %7d %-6s",
 		   vcc->dev->number, vcc->vpi, vcc->vci,
 		   vcc->qos.aal >= ARRAY_SIZE(aal_name) ? "err" :
 		   aal_name[vcc->qos.aal], vcc->qos.rxtp.min_pcr,
 		   class_name[vcc->qos.rxtp.traffic_class],
 		   vcc->qos.txtp.min_pcr,
 		   class_name[vcc->qos.txtp.traffic_class]);
 	if (test_bit(ATM_VF_IS_CLIP, &vcc->flags)) {
 		struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
 		struct net_device *dev;

 		dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : NULL;
 		seq_printf(seq, "CLIP, Itf:%s, Encap:",
 		    dev ? dev->name : "none?");
 		seq_printf(seq, "%s", clip_vcc->encap ? "LLC/SNAP" : "None");
 	}
 	seq_putc(seq, '\n');
 }

 static const char *vcc_state(struct atm_vcc *vcc)
 {
 	static const char *const map[] = { ATM_VS2TXT_MAP };

 	return map[ATM_VF2VS(vcc->flags)];
 }

 static void vcc_info(struct seq_file *seq, struct atm_vcc *vcc)
 {
 	struct sock *sk = sk_atm(vcc);

 	seq_printf(seq, "%pK ", vcc);
 	if (!vcc->dev)
 		seq_printf(seq, "Unassigned    ");
 	else
 		seq_printf(seq, "%3d %3d %5d ", vcc->dev->number, vcc->vpi,
 			vcc->vci);
 	switch (sk->sk_family) {
 	case AF_ATMPVC:
 		seq_printf(seq, "PVC");
 		break;
 	case AF_ATMSVC:
 		seq_printf(seq, "SVC");
 		break;
 	default:
 		seq_printf(seq, "%3d", sk->sk_family);
 	}
 	seq_printf(seq, " %04lx  %5d %7d/%7d %7d/%7d [%d]\n",
 		   vcc->flags, sk->sk_err,
 		   sk_wmem_alloc_get(sk), sk->sk_sndbuf,
 		   sk_rmem_alloc_get(sk), sk->sk_rcvbuf,
 		   refcount_read(&sk->sk_refcnt));
 }

 static void svc_info(struct seq_file *seq, struct atm_vcc *vcc)
 {
 	if (!vcc->dev)
 		seq_printf(seq, sizeof(void *) == 4 ?
 			   "N/A@%pK%10s" : "N/A@%pK%2s", vcc, "");
 	else
 		seq_printf(seq, "%3d %3d %5d         ",
 			   vcc->dev->number, vcc->vpi, vcc->vci);
 	seq_printf(seq, "%-10s ", vcc_state(vcc));
 	seq_printf(seq, "%s%s", vcc->remote.sas_addr.pub,
 	    *vcc->remote.sas_addr.pub && *vcc->remote.sas_addr.prv ? "+" : "");
 	if (*vcc->remote.sas_addr.prv) {
 		int i;

 		for (i = 0; i < ATM_ESA_LEN; i++)
 			seq_printf(seq, "%02x", vcc->remote.sas_addr.prv[i]);
 	}
 	seq_putc(seq, '\n');
 }

 static int atm_dev_seq_show(struct seq_file *seq, void *v)
 {
 	static char atm_dev_banner[] =
 		"Itf Type    ESI/\"MAC\"addr "
 		"AAL(TX,err,RX,err,drop) ...               [refcnt]\n";

 	if (v == &atm_devs)
 		seq_puts(seq, atm_dev_banner);
 	else {
 		struct atm_dev *dev = list_entry(v, struct atm_dev, dev_list);

 		atm_dev_info(seq, dev);
 	}
 	return 0;
 }

 static const struct seq_operations atm_dev_seq_ops = {
 	.start	= atm_dev_seq_start,
 	.next	= atm_dev_seq_next,
 	.stop	= atm_dev_seq_stop,
 	.show	= atm_dev_seq_show,
 };

 static int atm_dev_seq_open(struct inode *inode, struct file *file)
 {
 	return seq_open(file, &atm_dev_seq_ops);
 }

 static const struct file_operations devices_seq_fops = {
 	.open		= atm_dev_seq_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
 	.release	= seq_release,
 };

 static int pvc_seq_show(struct seq_file *seq, void *v)
 {
 	static char atm_pvc_banner[] =
 		"Itf VPI VCI   AAL RX(PCR,Class) TX(PCR,Class)\n";

 	if (v == SEQ_START_TOKEN)
 		seq_puts(seq, atm_pvc_banner);
 	else {
 		struct vcc_state *state = seq->private;
 		struct atm_vcc *vcc = atm_sk(state->sk);

 		pvc_info(seq, vcc);
 	}
 	return 0;
 }

 static const struct seq_operations pvc_seq_ops = {
 	.start	= vcc_seq_start,
 	.next	= vcc_seq_next,
 	.stop	= vcc_seq_stop,
 	.show	= pvc_seq_show,
 };

 static int pvc_seq_open(struct inode *inode, struct file *file)
 {
 	return __vcc_seq_open(inode, file, PF_ATMPVC, &pvc_seq_ops);
 }

 static const struct file_operations pvc_seq_fops = {
 	.open		= pvc_seq_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
 	.release	= seq_release_private,
 };

 static int vcc_seq_show(struct seq_file *seq, void *v)
 {
 	if (v == SEQ_START_TOKEN) {
 		seq_printf(seq, sizeof(void *) == 4 ? "%-8s%s" : "%-16s%s",
 			"Address ", "Itf VPI VCI   Fam Flags Reply "
 			"Send buffer     Recv buffer      [refcnt]\n");
 	} else {
 		struct vcc_state *state = seq->private;
 		struct atm_vcc *vcc = atm_sk(state->sk);

 		vcc_info(seq, vcc);
 	}
 	return 0;
 }

 static const struct seq_operations vcc_seq_ops = {
 	.start	= vcc_seq_start,
 	.next	= vcc_seq_next,
 	.stop	= vcc_seq_stop,
 	.show	= vcc_seq_show,
 };

 static int vcc_seq_open(struct inode *inode, struct file *file)
 {
 	return __vcc_seq_open(inode, file, 0, &vcc_seq_ops);
 }

 static const struct file_operations vcc_seq_fops = {
 	.open		= vcc_seq_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
 	.release	= seq_release_private,
 };

 static int svc_seq_show(struct seq_file *seq, void *v)
 {
 	static const char atm_svc_banner[] =
 		"Itf VPI VCI           State      Remote\n";

 	if (v == SEQ_START_TOKEN)
 		seq_puts(seq, atm_svc_banner);
 	else {
 		struct vcc_state *state = seq->private;
 		struct atm_vcc *vcc = atm_sk(state->sk);

 		svc_info(seq, vcc);
 	}
 	return 0;
 }

 static const struct seq_operations svc_seq_ops = {
 	.start	= vcc_seq_start,
 	.next	= vcc_seq_next,
 	.stop	= vcc_seq_stop,
 	.show	= svc_seq_show,
 };

 static int svc_seq_open(struct inode *inode, struct file *file)
 {
 	return __vcc_seq_open(inode, file, PF_ATMSVC, &svc_seq_ops);
 }

 static const struct file_operations svc_seq_fops = {
 	.open		= svc_seq_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
 	.release	= seq_release_private,
 };

 static ssize_t proc_dev_atm_read(struct file *file, char __user *buf,
 				 size_t count, loff_t *pos)
 {
 	struct atm_dev *dev;
 	unsigned long page;
 	int length;

 	if (count == 0)
 		return 0;
 	page = get_zeroed_page(GFP_KERNEL);
 	if (!page)
 		return -ENOMEM;
 	dev = PDE_DATA(file_inode(file));
 	if (!dev->ops->proc_read)
 		length = -EINVAL;
 	else {
 		length = dev->ops->proc_read(dev, pos, (char *)page);
 		if (length > count)
 			length = -EINVAL;
 	}
 	if (length >= 0) {
 		if (copy_to_user(buf, (char *)page, length))
 			length = -EFAULT;
 		(*pos)++;
 	}
 	free_page(page);
 	return length;
 }

 struct proc_dir_entry *atm_proc_root;
 EXPORT_SYMBOL(atm_proc_root);


 int atm_proc_dev_register(struct atm_dev *dev)
 {
 	int error;

 	/* No proc info */
 	if (!dev->ops->proc_read)
 		return 0;

 	error = -ENOMEM;
 	dev->proc_name = kasprintf(GFP_KERNEL, "%s:%d", dev->type, dev->number);
 	if (!dev->proc_name)
 		goto err_out;

 	dev->proc_entry = proc_create_data(dev->proc_name, 0, atm_proc_root,
 					   &proc_atm_dev_ops, dev);
 	if (!dev->proc_entry)
 		goto err_free_name;
 	return 0;

 err_free_name:
 	kfree(dev->proc_name);
 err_out:
 	return error;
 }

 void atm_proc_dev_deregister(struct atm_dev *dev)
 {
 	if (!dev->ops->proc_read)
 		return;

 	remove_proc_entry(dev->proc_name, atm_proc_root);
 	kfree(dev->proc_name);
 }

 static struct atm_proc_entry {
 	char *name;
 	const struct file_operations *proc_fops;
 	struct proc_dir_entry *dirent;
 } atm_proc_ents[] = {
 	{ .name = "devices",	.proc_fops = &devices_seq_fops },
 	{ .name = "pvc",	.proc_fops = &pvc_seq_fops },
 	{ .name = "svc",	.proc_fops = &svc_seq_fops },
 	{ .name = "vc",		.proc_fops = &vcc_seq_fops },
 	{ .name = NULL,		.proc_fops = NULL }
 };

 static void atm_proc_dirs_remove(void)
 {
 	static struct atm_proc_entry *e;

 	for (e = atm_proc_ents; e->name; e++) {
 		if (e->dirent)
 			remove_proc_entry(e->name, atm_proc_root);
 	}
 	remove_proc_entry("atm", init_net.proc_net);
 }

 int __init atm_proc_init(void)
 {
 	static struct atm_proc_entry *e;
 	int ret;

 	atm_proc_root = proc_net_mkdir(&init_net, "atm", init_net.proc_net);
 	if (!atm_proc_root)
 		goto err_out;
 	for (e = atm_proc_ents; e->name; e++) {
 		struct proc_dir_entry *dirent;

 		dirent = proc_create(e->name, S_IRUGO,
 				     atm_proc_root, e->proc_fops);
 		if (!dirent)
 			goto err_out_remove;
 		e->dirent = dirent;
 	}
 	ret = 0;
 out:
 	return ret;

 err_out_remove:
 	atm_proc_dirs_remove();
 err_out:
 	ret = -ENOMEM;
 	goto out;
 }

 void atm_proc_exit(void)
 {
 	atm_proc_dirs_remove();
 }
	// SPDX-License-Identifier: GPL-2.0
	/* net/atm/proc.c - ATM /proc interface
	*
	* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA
	*
	* seq_file api usage by romieu@fr.zoreil.com
	*
	* Evaluating the efficiency of the whole thing if left as an exercise to
	* the reader.
	*/

	#include <linux/module.h> /* for EXPORT_SYMBOL */
	#include <linux/string.h>
	#include <linux/types.h>
	#include <linux/mm.h>
	#include <linux/fs.h>
	#include <linux/stat.h>
	#include <linux/proc_fs.h>
	#include <linux/seq_file.h>
	#include <linux/errno.h>
	#include <linux/atm.h>
	#include <linux/atmdev.h>
	#include <linux/netdevice.h>
	#include <linux/atmclip.h>
	#include <linux/init.h> /* for __init */
	#include <linux/slab.h>
	#include <net/net_namespace.h>
	#include <net/atmclip.h>
	#include <linux/uaccess.h>
	#include <linux/param.h> /* for HZ */
	#include <linux/atomic.h>
	#include "resources.h"
	#include "common.h" /* atm_proc_init prototype */
	#include "signaling.h" /* to get sigd - ugly too */

	static ssize_t proc_dev_atm_read(struct file file, char __user buf,
	size_t count, loff_t *pos);

	static const struct file_operations proc_atm_dev_ops = {
	.read = proc_dev_atm_read,
	.llseek = noop_llseek,
	};

	static void add_stats(struct seq_file seq, const char aal,
	const struct k_atm_aal_stats *stats)
	{
	seq_printf(seq, "%s ( %d %d %d %d %d )", aal,
	atomic_read(&stats->tx), atomic_read(&stats->tx_err),
	atomic_read(&stats->rx), atomic_read(&stats->rx_err),
	atomic_read(&stats->rx_drop));
	}

	static void atm_dev_info(struct seq_file seq, const struct atm_dev dev)
	{
	int i;

	seq_printf(seq, "%3d %-8s", dev->number, dev->type);
	for (i = 0; i < ESI_LEN; i++)
	seq_printf(seq, "%02x", dev->esi[i]);
	seq_puts(seq, " ");
	add_stats(seq, "0", &dev->stats.aal0);
	seq_puts(seq, " ");
	add_stats(seq, "5", &dev->stats.aal5);
	seq_printf(seq, "\t[%d]", refcount_read(&dev->refcnt));
	seq_putc(seq, '\n');
	}

	struct vcc_state {
	int bucket;
	struct sock *sk;
	int family;
	};

	static inline int compare_family(struct sock *sk, int family)
	{
	return !family \|\| (sk->sk_family == family);
	}

	static int __vcc_walk(struct sock *sock, int family, int bucket, loff_t l)
	{
	struct sock sk = sock;

	if (sk == SEQ_START_TOKEN) {
	for (bucket = 0; bucket < VCC_HTABLE_SIZE; ++*bucket) {
	struct hlist_head head = &vcc_hash[bucket];

	sk = hlist_empty(head) ? NULL : __sk_head(head);
	if (sk)
	break;
	}
	l--;
	}
	try_again:
	for (; sk; sk = sk_next(sk)) {
	l -= compare_family(sk, family);
	if (l < 0)
	goto out;
	}
	if (!sk && ++*bucket < VCC_HTABLE_SIZE) {
	sk = sk_head(&vcc_hash[*bucket]);
	goto try_again;
	}
	sk = SEQ_START_TOKEN;
	out:
	*sock = sk;
	return (l < 0);
	}

	static inline void vcc_walk(struct vcc_state state, loff_t l)
	{
	return __vcc_walk(&state->sk, state->family, &state->bucket, l) ?
	state : NULL;
	}

	static int __vcc_seq_open(struct inode inode, struct file file,
	int family, const struct seq_operations *ops)
	{
	struct vcc_state *state;

	state = __seq_open_private(file, ops, sizeof(*state));
	if (state == NULL)
	return -ENOMEM;

	state->family = family;
	return 0;
	}

	static void vcc_seq_start(struct seq_file seq, loff_t *pos)
	__acquires(vcc_sklist_lock)
	{
	struct vcc_state *state = seq->private;
	loff_t left = *pos;

	read_lock(&vcc_sklist_lock);
	state->sk = SEQ_START_TOKEN;
	return left ? vcc_walk(state, left) : SEQ_START_TOKEN;
	}

	static void vcc_seq_stop(struct seq_file seq, void v)
	__releases(vcc_sklist_lock)
	{
	read_unlock(&vcc_sklist_lock);
	}

	static void vcc_seq_next(struct seq_file seq, void v, loff_t pos)
	{
	struct vcc_state *state = seq->private;

	v = vcc_walk(state, 1);
	*pos += !!PTR_ERR(v);
	return v;
	}

	static void pvc_info(struct seq_file seq, struct atm_vcc vcc)
	{
	static const char *const class_name[] = {
	"off", "UBR", "CBR", "VBR", "ABR"};
	static const char *const aal_name[] = {
	"---", "1", "2", "3/4", /* 0- 3 */
	"???", "5", "???", "???", /* 4- 7 */
	"???", "???", "???", "???", /* 8-11 */
	"???", "0", "???", "???"}; /* 12-15 */

	seq_printf(seq, "%3d %3d %5d %-3s %7d %-5s %7d %-6s",
	vcc->dev->number, vcc->vpi, vcc->vci,
	vcc->qos.aal >= ARRAY_SIZE(aal_name) ? "err" :
	aal_name[vcc->qos.aal], vcc->qos.rxtp.min_pcr,
	class_name[vcc->qos.rxtp.traffic_class],
	vcc->qos.txtp.min_pcr,
	class_name[vcc->qos.txtp.traffic_class]);
	if (test_bit(ATM_VF_IS_CLIP, &vcc->flags)) {
	struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
	struct net_device *dev;

	dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : NULL;
	seq_printf(seq, "CLIP, Itf:%s, Encap:",
	dev ? dev->name : "none?");
	seq_printf(seq, "%s", clip_vcc->encap ? "LLC/SNAP" : "None");
	}
	seq_putc(seq, '\n');
	}

	static const char vcc_state(struct atm_vcc vcc)
	{
	static const char *const map[] = { ATM_VS2TXT_MAP };

	return map[ATM_VF2VS(vcc->flags)];
	}

	static void vcc_info(struct seq_file seq, struct atm_vcc vcc)
	{
	struct sock *sk = sk_atm(vcc);

	seq_printf(seq, "%pK ", vcc);
	if (!vcc->dev)
	seq_printf(seq, "Unassigned ");
	else
	seq_printf(seq, "%3d %3d %5d ", vcc->dev->number, vcc->vpi,
	vcc->vci);
	switch (sk->sk_family) {
	case AF_ATMPVC:
	seq_printf(seq, "PVC");
	break;
	case AF_ATMSVC:
	seq_printf(seq, "SVC");
	break;
	default:
	seq_printf(seq, "%3d", sk->sk_family);
	}
	seq_printf(seq, " %04lx %5d %7d/%7d %7d/%7d [%d]\n",
	vcc->flags, sk->sk_err,
	sk_wmem_alloc_get(sk), sk->sk_sndbuf,
	sk_rmem_alloc_get(sk), sk->sk_rcvbuf,
	refcount_read(&sk->sk_refcnt));
	}

	static void svc_info(struct seq_file seq, struct atm_vcc vcc)
	{
	if (!vcc->dev)
	seq_printf(seq, sizeof(void *) == 4 ?
	"N/A@%pK%10s" : "N/A@%pK%2s", vcc, "");
	else
	seq_printf(seq, "%3d %3d %5d ",
	vcc->dev->number, vcc->vpi, vcc->vci);
	seq_printf(seq, "%-10s ", vcc_state(vcc));
	seq_printf(seq, "%s%s", vcc->remote.sas_addr.pub,
	vcc->remote.sas_addr.pub && vcc->remote.sas_addr.prv ? "+" : "");
	if (*vcc->remote.sas_addr.prv) {
	int i;

	for (i = 0; i < ATM_ESA_LEN; i++)
	seq_printf(seq, "%02x", vcc->remote.sas_addr.prv[i]);
	}
	seq_putc(seq, '\n');
	}

	static int atm_dev_seq_show(struct seq_file seq, void v)
	{
	static char atm_dev_banner[] =
	"Itf Type ESI/\"MAC\"addr "
	"AAL(TX,err,RX,err,drop) ... [refcnt]\n";

	if (v == &atm_devs)
	seq_puts(seq, atm_dev_banner);
	else {
	struct atm_dev *dev = list_entry(v, struct atm_dev, dev_list);

	atm_dev_info(seq, dev);
	}
	return 0;
	}

	static const struct seq_operations atm_dev_seq_ops = {
	.start = atm_dev_seq_start,
	.next = atm_dev_seq_next,
	.stop = atm_dev_seq_stop,
	.show = atm_dev_seq_show,
	};

	static int atm_dev_seq_open(struct inode inode, struct file file)
	{
	return seq_open(file, &atm_dev_seq_ops);
	}

	static const struct file_operations devices_seq_fops = {
	.open = atm_dev_seq_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = seq_release,
	};

	static int pvc_seq_show(struct seq_file seq, void v)
	{
	static char atm_pvc_banner[] =
	"Itf VPI VCI AAL RX(PCR,Class) TX(PCR,Class)\n";

	if (v == SEQ_START_TOKEN)
	seq_puts(seq, atm_pvc_banner);
	else {
	struct vcc_state *state = seq->private;
	struct atm_vcc *vcc = atm_sk(state->sk);

	pvc_info(seq, vcc);
	}
	return 0;
	}

	static const struct seq_operations pvc_seq_ops = {
	.start = vcc_seq_start,
	.next = vcc_seq_next,
	.stop = vcc_seq_stop,
	.show = pvc_seq_show,
	};

	static int pvc_seq_open(struct inode inode, struct file file)
	{
	return __vcc_seq_open(inode, file, PF_ATMPVC, &pvc_seq_ops);
	}

	static const struct file_operations pvc_seq_fops = {
	.open = pvc_seq_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = seq_release_private,
	};

	static int vcc_seq_show(struct seq_file seq, void v)
	{
	if (v == SEQ_START_TOKEN) {
	seq_printf(seq, sizeof(void *) == 4 ? "%-8s%s" : "%-16s%s",
	"Address ", "Itf VPI VCI Fam Flags Reply "
	"Send buffer Recv buffer [refcnt]\n");
	} else {
	struct vcc_state *state = seq->private;
	struct atm_vcc *vcc = atm_sk(state->sk);

	vcc_info(seq, vcc);
	}
	return 0;
	}

	static const struct seq_operations vcc_seq_ops = {
	.start = vcc_seq_start,
	.next = vcc_seq_next,
	.stop = vcc_seq_stop,
	.show = vcc_seq_show,
	};

	static int vcc_seq_open(struct inode inode, struct file file)
	{
	return __vcc_seq_open(inode, file, 0, &vcc_seq_ops);
	}

	static const struct file_operations vcc_seq_fops = {
	.open = vcc_seq_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = seq_release_private,
	};

	static int svc_seq_show(struct seq_file seq, void v)
	{
	static const char atm_svc_banner[] =
	"Itf VPI VCI State Remote\n";

	if (v == SEQ_START_TOKEN)
	seq_puts(seq, atm_svc_banner);
	else {
	struct vcc_state *state = seq->private;
	struct atm_vcc *vcc = atm_sk(state->sk);

	svc_info(seq, vcc);
	}
	return 0;
	}

	static const struct seq_operations svc_seq_ops = {
	.start = vcc_seq_start,
	.next = vcc_seq_next,
	.stop = vcc_seq_stop,
	.show = svc_seq_show,
	};

	static int svc_seq_open(struct inode inode, struct file file)
	{
	return __vcc_seq_open(inode, file, PF_ATMSVC, &svc_seq_ops);
	}

	static const struct file_operations svc_seq_fops = {
	.open = svc_seq_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = seq_release_private,
	};

	static ssize_t proc_dev_atm_read(struct file file, char __user buf,
	size_t count, loff_t *pos)
	{
	struct atm_dev *dev;
	unsigned long page;
	int length;

	if (count == 0)
	return 0;
	page = get_zeroed_page(GFP_KERNEL);
	if (!page)
	return -ENOMEM;
	dev = PDE_DATA(file_inode(file));
	if (!dev->ops->proc_read)
	length = -EINVAL;
	else {
	length = dev->ops->proc_read(dev, pos, (char *)page);
	if (length > count)
	length = -EINVAL;
	}
	if (length >= 0) {
	if (copy_to_user(buf, (char *)page, length))
	length = -EFAULT;
	(*pos)++;
	}
	free_page(page);
	return length;
	}

	struct proc_dir_entry *atm_proc_root;
	EXPORT_SYMBOL(atm_proc_root);


	int atm_proc_dev_register(struct atm_dev *dev)
	{
	int error;

	/* No proc info */
	if (!dev->ops->proc_read)
	return 0;

	error = -ENOMEM;
	dev->proc_name = kasprintf(GFP_KERNEL, "%s:%d", dev->type, dev->number);
	if (!dev->proc_name)
	goto err_out;

	dev->proc_entry = proc_create_data(dev->proc_name, 0, atm_proc_root,
	&proc_atm_dev_ops, dev);
	if (!dev->proc_entry)
	goto err_free_name;
	return 0;

	err_free_name:
	kfree(dev->proc_name);
	err_out:
	return error;
	}

	void atm_proc_dev_deregister(struct atm_dev *dev)
	{
	if (!dev->ops->proc_read)
	return;

	remove_proc_entry(dev->proc_name, atm_proc_root);
	kfree(dev->proc_name);
	}

	static struct atm_proc_entry {
	char *name;
	const struct file_operations *proc_fops;
	struct proc_dir_entry *dirent;
	} atm_proc_ents[] = {
	{ .name = "devices", .proc_fops = &devices_seq_fops },
	{ .name = "pvc", .proc_fops = &pvc_seq_fops },
	{ .name = "svc", .proc_fops = &svc_seq_fops },
	{ .name = "vc", .proc_fops = &vcc_seq_fops },
	{ .name = NULL, .proc_fops = NULL }
	};

	static void atm_proc_dirs_remove(void)
	{
	static struct atm_proc_entry *e;

	for (e = atm_proc_ents; e->name; e++) {
	if (e->dirent)
	remove_proc_entry(e->name, atm_proc_root);
	}
	remove_proc_entry("atm", init_net.proc_net);
	}

	int __init atm_proc_init(void)
	{
	static struct atm_proc_entry *e;
	int ret;

	atm_proc_root = proc_net_mkdir(&init_net, "atm", init_net.proc_net);
	if (!atm_proc_root)
	goto err_out;
	for (e = atm_proc_ents; e->name; e++) {
	struct proc_dir_entry *dirent;

	dirent = proc_create(e->name, S_IRUGO,
	atm_proc_root, e->proc_fops);
	if (!dirent)
	goto err_out_remove;
	e->dirent = dirent;
	}
	ret = 0;
	out:
	return ret;

	err_out_remove:
	atm_proc_dirs_remove();
	err_out:
	ret = -ENOMEM;
	goto out;
	}

	void atm_proc_exit(void)
	{
	atm_proc_dirs_remove();
	}