net/core/net-procfs.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 #include <linux/netdevice.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <net/wext.h>

 #define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)

 #define get_bucket(x) ((x) >> BUCKET_SPACE)
 #define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
 #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))

 static inline struct net_device *dev_from_same_bucket(struct seq_file *seq, loff_t *pos)
 {
 	struct net *net = seq_file_net(seq);
 	struct net_device *dev;
 	struct hlist_head *h;
 	unsigned int count = 0, offset = get_offset(*pos);

 	h = &net->dev_index_head[get_bucket(*pos)];
 	hlist_for_each_entry_rcu(dev, h, index_hlist) {
 		if (++count == offset)
 			return dev;
 	}

 	return NULL;
 }

 static inline struct net_device *dev_from_bucket(struct seq_file *seq, loff_t *pos)
 {
 	struct net_device *dev;
 	unsigned int bucket;

 	do {
 		dev = dev_from_same_bucket(seq, pos);
 		if (dev)
 			return dev;

 		bucket = get_bucket(*pos) + 1;
 		*pos = set_bucket_offset(bucket, 1);
 	} while (bucket < NETDEV_HASHENTRIES);

 	return NULL;
 }

 /*
  *	This is invoked by the /proc filesystem handler to display a device
  *	in detail.
  */
 static void *dev_seq_start(struct seq_file *seq, loff_t *pos)
 	__acquires(RCU)
 {
 	rcu_read_lock();
 	if (!*pos)
 		return SEQ_START_TOKEN;

 	if (get_bucket(*pos) >= NETDEV_HASHENTRIES)
 		return NULL;

 	return dev_from_bucket(seq, pos);
 }

 static void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
 	++*pos;
 	return dev_from_bucket(seq, pos);
 }

 static void dev_seq_stop(struct seq_file *seq, void *v)
 	__releases(RCU)
 {
 	rcu_read_unlock();
 }

 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
 {
 	struct rtnl_link_stats64 temp;
 	const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);

 	seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
 		   "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
 		   dev->name, stats->rx_bytes, stats->rx_packets,
 		   stats->rx_errors,
 		   stats->rx_dropped + stats->rx_missed_errors,
 		   stats->rx_fifo_errors,
 		   stats->rx_length_errors + stats->rx_over_errors +
 		    stats->rx_crc_errors + stats->rx_frame_errors,
 		   stats->rx_compressed, stats->multicast,
 		   stats->tx_bytes, stats->tx_packets,
 		   stats->tx_errors, stats->tx_dropped,
 		   stats->tx_fifo_errors, stats->collisions,
 		   stats->tx_carrier_errors +
 		    stats->tx_aborted_errors +
 		    stats->tx_window_errors +
 		    stats->tx_heartbeat_errors,
 		   stats->tx_compressed);
 }

 /*
  *	Called from the PROCfs module. This now uses the new arbitrary sized
  *	/proc/net interface to create /proc/net/dev
  */
 static int dev_seq_show(struct seq_file *seq, void *v)
 {
 	if (v == SEQ_START_TOKEN)
 		seq_puts(seq, "Inter-|   Receive                            "
 			      "                    |  Transmit\n"
 			      " face |bytes    packets errs drop fifo frame "
 			      "compressed multicast|bytes    packets errs "
 			      "drop fifo colls carrier compressed\n");
 	else
 		dev_seq_printf_stats(seq, v);
 	return 0;
 }

 static u32 softnet_backlog_len(struct softnet_data *sd)
 {
 	return skb_queue_len_lockless(&sd->input_pkt_queue) +
 	       skb_queue_len_lockless(&sd->process_queue);
 }

 static struct softnet_data *softnet_get_online(loff_t *pos)
 {
 	struct softnet_data *sd = NULL;

 	while (*pos < nr_cpu_ids)
 		if (cpu_online(*pos)) {
 			sd = &per_cpu(softnet_data, *pos);
 			break;
 		} else
 			++*pos;
 	return sd;
 }

 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
 {
 	return softnet_get_online(pos);
 }

 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
 	++*pos;
 	return softnet_get_online(pos);
 }

 static void softnet_seq_stop(struct seq_file *seq, void *v)
 {
 }

 static int softnet_seq_show(struct seq_file *seq, void *v)
 {
 	struct softnet_data *sd = v;
 	unsigned int flow_limit_count = 0;

 #ifdef CONFIG_NET_FLOW_LIMIT
 	struct sd_flow_limit *fl;

 	rcu_read_lock();
 	fl = rcu_dereference(sd->flow_limit);
 	if (fl)
 		flow_limit_count = fl->count;
 	rcu_read_unlock();
 #endif

 	/* the index is the CPU id owing this sd. Since offline CPUs are not
 	 * displayed, it would be othrwise not trivial for the user-space
 	 * mapping the data a specific CPU
 	 */
 	seq_printf(seq,
 		   "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
 		   sd->processed, sd->dropped, sd->time_squeeze, 0,
 		   0, 0, 0, 0, /* was fastroute */
 		   0,	/* was cpu_collision */
 		   sd->received_rps, flow_limit_count,
 		   softnet_backlog_len(sd), (int)seq->index);
 	return 0;
 }

 static const struct seq_operations dev_seq_ops = {
 	.start = dev_seq_start,
 	.next  = dev_seq_next,
 	.stop  = dev_seq_stop,
 	.show  = dev_seq_show,
 };

 static const struct seq_operations softnet_seq_ops = {
 	.start = softnet_seq_start,
 	.next  = softnet_seq_next,
 	.stop  = softnet_seq_stop,
 	.show  = softnet_seq_show,
 };

 static void *ptype_get_idx(struct seq_file *seq, loff_t pos)
 {
 	struct list_head *ptype_list = NULL;
 	struct packet_type *pt = NULL;
 	struct net_device *dev;
 	loff_t i = 0;
 	int t;

 	for_each_netdev_rcu(seq_file_net(seq), dev) {
 		ptype_list = &dev->ptype_all;
 		list_for_each_entry_rcu(pt, ptype_list, list) {
 			if (i == pos)
 				return pt;
 			++i;
 		}
 	}

 	list_for_each_entry_rcu(pt, &ptype_all, list) {
 		if (i == pos)
 			return pt;
 		++i;
 	}

 	for (t = 0; t < PTYPE_HASH_SIZE; t++) {
 		list_for_each_entry_rcu(pt, &ptype_base[t], list) {
 			if (i == pos)
 				return pt;
 			++i;
 		}
 	}
 	return NULL;
 }

 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
 	__acquires(RCU)
 {
 	rcu_read_lock();
 	return *pos ? ptype_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
 }

 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
 	struct net_device *dev;
 	struct packet_type *pt;
 	struct list_head *nxt;
 	int hash;

 	++*pos;
 	if (v == SEQ_START_TOKEN)
 		return ptype_get_idx(seq, 0);

 	pt = v;
 	nxt = pt->list.next;
 	if (pt->dev) {
 		if (nxt != &pt->dev->ptype_all)
 			goto found;

 		dev = pt->dev;
 		for_each_netdev_continue_rcu(seq_file_net(seq), dev) {
 			if (!list_empty(&dev->ptype_all)) {
 				nxt = dev->ptype_all.next;
 				goto found;
 			}
 		}

 		nxt = ptype_all.next;
 		goto ptype_all;
 	}

 	if (pt->type == htons(ETH_P_ALL)) {
 ptype_all:
 		if (nxt != &ptype_all)
 			goto found;
 		hash = 0;
 		nxt = ptype_base[0].next;
 	} else
 		hash = ntohs(pt->type) & PTYPE_HASH_MASK;

 	while (nxt == &ptype_base[hash]) {
 		if (++hash >= PTYPE_HASH_SIZE)
 			return NULL;
 		nxt = ptype_base[hash].next;
 	}
 found:
 	return list_entry(nxt, struct packet_type, list);
 }

 static void ptype_seq_stop(struct seq_file *seq, void *v)
 	__releases(RCU)
 {
 	rcu_read_unlock();
 }

 static int ptype_seq_show(struct seq_file *seq, void *v)
 {
 	struct packet_type *pt = v;

 	if (v == SEQ_START_TOKEN)
 		seq_puts(seq, "Type Device      Function\n");
 	else if ((!pt->af_packet_net || net_eq(pt->af_packet_net, seq_file_net(seq))) &&
 		 (!pt->dev || net_eq(dev_net(pt->dev), seq_file_net(seq)))) {
 		if (pt->type == htons(ETH_P_ALL))
 			seq_puts(seq, "ALL ");
 		else
 			seq_printf(seq, "%04x", ntohs(pt->type));

 		seq_printf(seq, " %-8s %ps\n",
 			   pt->dev ? pt->dev->name : "", pt->func);
 	}

 	return 0;
 }

 static const struct seq_operations ptype_seq_ops = {
 	.start = ptype_seq_start,
 	.next  = ptype_seq_next,
 	.stop  = ptype_seq_stop,
 	.show  = ptype_seq_show,
 };

 static int __net_init dev_proc_net_init(struct net *net)
 {
 	int rc = -ENOMEM;

 	if (!proc_create_net("dev", 0444, net->proc_net, &dev_seq_ops,
 			sizeof(struct seq_net_private)))
 		goto out;
 	if (!proc_create_seq("softnet_stat", 0444, net->proc_net,
 			 &softnet_seq_ops))
 		goto out_dev;
 	if (!proc_create_net("ptype", 0444, net->proc_net, &ptype_seq_ops,
 			sizeof(struct seq_net_private)))
 		goto out_softnet;

 	if (wext_proc_init(net))
 		goto out_ptype;
 	rc = 0;
 out:
 	return rc;
 out_ptype:
 	remove_proc_entry("ptype", net->proc_net);
 out_softnet:
 	remove_proc_entry("softnet_stat", net->proc_net);
 out_dev:
 	remove_proc_entry("dev", net->proc_net);
 	goto out;
 }

 static void __net_exit dev_proc_net_exit(struct net *net)
 {
 	wext_proc_exit(net);

 	remove_proc_entry("ptype", net->proc_net);
 	remove_proc_entry("softnet_stat", net->proc_net);
 	remove_proc_entry("dev", net->proc_net);
 }

 static struct pernet_operations __net_initdata dev_proc_ops = {
 	.init = dev_proc_net_init,
 	.exit = dev_proc_net_exit,
 };

 static int dev_mc_seq_show(struct seq_file *seq, void *v)
 {
 	struct netdev_hw_addr *ha;
 	struct net_device *dev = v;

 	if (v == SEQ_START_TOKEN)
 		return 0;

 	netif_addr_lock_bh(dev);
 	netdev_for_each_mc_addr(ha, dev) {
 		seq_printf(seq, "%-4d %-15s %-5d %-5d %*phN\n",
 			   dev->ifindex, dev->name,
 			   ha->refcount, ha->global_use,
 			   (int)dev->addr_len, ha->addr);
 	}
 	netif_addr_unlock_bh(dev);
 	return 0;
 }

 static const struct seq_operations dev_mc_seq_ops = {
 	.start = dev_seq_start,
 	.next  = dev_seq_next,
 	.stop  = dev_seq_stop,
 	.show  = dev_mc_seq_show,
 };

 static int __net_init dev_mc_net_init(struct net *net)
 {
 	if (!proc_create_net("dev_mcast", 0, net->proc_net, &dev_mc_seq_ops,
 			sizeof(struct seq_net_private)))
 		return -ENOMEM;
 	return 0;
 }

 static void __net_exit dev_mc_net_exit(struct net *net)
 {
 	remove_proc_entry("dev_mcast", net->proc_net);
 }

 static struct pernet_operations __net_initdata dev_mc_net_ops = {
 	.init = dev_mc_net_init,
 	.exit = dev_mc_net_exit,
 };

 int __init dev_proc_init(void)
 {
 	int ret = register_pernet_subsys(&dev_proc_ops);
 	if (!ret)
 		return register_pernet_subsys(&dev_mc_net_ops);
 	return ret;
 }
	// SPDX-License-Identifier: GPL-2.0
	#include <linux/netdevice.h>
	#include <linux/proc_fs.h>
	#include <linux/seq_file.h>
	#include <net/wext.h>

	#define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)

	#define get_bucket(x) ((x) >> BUCKET_SPACE)
	#define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
	#define set_bucket_offset(b, o) ((b) << BUCKET_SPACE \| (o))

	static inline struct net_device dev_from_same_bucket(struct seq_file seq, loff_t *pos)
	{
	struct net *net = seq_file_net(seq);
	struct net_device *dev;
	struct hlist_head *h;
	unsigned int count = 0, offset = get_offset(*pos);

	h = &net->dev_index_head[get_bucket(*pos)];
	hlist_for_each_entry_rcu(dev, h, index_hlist) {
	if (++count == offset)
	return dev;
	}

	return NULL;
	}

	static inline struct net_device dev_from_bucket(struct seq_file seq, loff_t *pos)
	{
	struct net_device *dev;
	unsigned int bucket;

	do {
	dev = dev_from_same_bucket(seq, pos);
	if (dev)
	return dev;

	bucket = get_bucket(*pos) + 1;
	*pos = set_bucket_offset(bucket, 1);
	} while (bucket < NETDEV_HASHENTRIES);

	return NULL;
	}

	/*
	* This is invoked by the /proc filesystem handler to display a device
	* in detail.
	*/
	static void dev_seq_start(struct seq_file seq, loff_t *pos)
	__acquires(RCU)
	{
	rcu_read_lock();
	if (!*pos)
	return SEQ_START_TOKEN;

	if (get_bucket(*pos) >= NETDEV_HASHENTRIES)
	return NULL;

	return dev_from_bucket(seq, pos);
	}

	static void dev_seq_next(struct seq_file seq, void v, loff_t pos)
	{
	++*pos;
	return dev_from_bucket(seq, pos);
	}

	static void dev_seq_stop(struct seq_file seq, void v)
	__releases(RCU)
	{
	rcu_read_unlock();
	}

	static void dev_seq_printf_stats(struct seq_file seq, struct net_device dev)
	{
	struct rtnl_link_stats64 temp;
	const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);

	seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
	"%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
	dev->name, stats->rx_bytes, stats->rx_packets,
	stats->rx_errors,
	stats->rx_dropped + stats->rx_missed_errors,
	stats->rx_fifo_errors,
	stats->rx_length_errors + stats->rx_over_errors +
	stats->rx_crc_errors + stats->rx_frame_errors,
	stats->rx_compressed, stats->multicast,
	stats->tx_bytes, stats->tx_packets,
	stats->tx_errors, stats->tx_dropped,
	stats->tx_fifo_errors, stats->collisions,
	stats->tx_carrier_errors +
	stats->tx_aborted_errors +
	stats->tx_window_errors +
	stats->tx_heartbeat_errors,
	stats->tx_compressed);
	}

	/*
	* Called from the PROCfs module. This now uses the new arbitrary sized
	* /proc/net interface to create /proc/net/dev
	*/
	static int dev_seq_show(struct seq_file seq, void v)
	{
	if (v == SEQ_START_TOKEN)
	seq_puts(seq, "Inter-\| Receive "
	" \| Transmit\n"
	" face \|bytes packets errs drop fifo frame "
	"compressed multicast\|bytes packets errs "
	"drop fifo colls carrier compressed\n");
	else
	dev_seq_printf_stats(seq, v);
	return 0;
	}

	static u32 softnet_backlog_len(struct softnet_data *sd)
	{
	return skb_queue_len_lockless(&sd->input_pkt_queue) +
	skb_queue_len_lockless(&sd->process_queue);
	}

	static struct softnet_data softnet_get_online(loff_t pos)
	{
	struct softnet_data *sd = NULL;

	while (*pos < nr_cpu_ids)
	if (cpu_online(*pos)) {
	sd = &per_cpu(softnet_data, *pos);
	break;
	} else
	++*pos;
	return sd;
	}

	static void softnet_seq_start(struct seq_file seq, loff_t *pos)
	{
	return softnet_get_online(pos);
	}

	static void softnet_seq_next(struct seq_file seq, void v, loff_t pos)
	{
	++*pos;
	return softnet_get_online(pos);
	}

	static void softnet_seq_stop(struct seq_file seq, void v)
	{
	}

	static int softnet_seq_show(struct seq_file seq, void v)
	{
	struct softnet_data *sd = v;
	unsigned int flow_limit_count = 0;

	#ifdef CONFIG_NET_FLOW_LIMIT
	struct sd_flow_limit *fl;

	rcu_read_lock();
	fl = rcu_dereference(sd->flow_limit);
	if (fl)
	flow_limit_count = fl->count;
	rcu_read_unlock();
	#endif

	/* the index is the CPU id owing this sd. Since offline CPUs are not
	* displayed, it would be othrwise not trivial for the user-space
	* mapping the data a specific CPU
	*/
	seq_printf(seq,
	"%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
	sd->processed, sd->dropped, sd->time_squeeze, 0,
	0, 0, 0, 0, /* was fastroute */
	0, /* was cpu_collision */
	sd->received_rps, flow_limit_count,
	softnet_backlog_len(sd), (int)seq->index);
	return 0;
	}

	static const struct seq_operations dev_seq_ops = {
	.start = dev_seq_start,
	.next = dev_seq_next,
	.stop = dev_seq_stop,
	.show = dev_seq_show,
	};

	static const struct seq_operations softnet_seq_ops = {
	.start = softnet_seq_start,
	.next = softnet_seq_next,
	.stop = softnet_seq_stop,
	.show = softnet_seq_show,
	};

	static void ptype_get_idx(struct seq_file seq, loff_t pos)
	{
	struct list_head *ptype_list = NULL;
	struct packet_type *pt = NULL;
	struct net_device *dev;
	loff_t i = 0;
	int t;

	for_each_netdev_rcu(seq_file_net(seq), dev) {
	ptype_list = &dev->ptype_all;
	list_for_each_entry_rcu(pt, ptype_list, list) {
	if (i == pos)
	return pt;
	++i;
	}
	}

	list_for_each_entry_rcu(pt, &ptype_all, list) {
	if (i == pos)
	return pt;
	++i;
	}

	for (t = 0; t < PTYPE_HASH_SIZE; t++) {
	list_for_each_entry_rcu(pt, &ptype_base[t], list) {
	if (i == pos)
	return pt;
	++i;
	}
	}
	return NULL;
	}

	static void ptype_seq_start(struct seq_file seq, loff_t *pos)
	__acquires(RCU)
	{
	rcu_read_lock();
	return pos ? ptype_get_idx(seq, pos - 1) : SEQ_START_TOKEN;
	}

	static void ptype_seq_next(struct seq_file seq, void v, loff_t pos)
	{
	struct net_device *dev;
	struct packet_type *pt;
	struct list_head *nxt;
	int hash;

	++*pos;
	if (v == SEQ_START_TOKEN)
	return ptype_get_idx(seq, 0);

	pt = v;
	nxt = pt->list.next;
	if (pt->dev) {
	if (nxt != &pt->dev->ptype_all)
	goto found;

	dev = pt->dev;
	for_each_netdev_continue_rcu(seq_file_net(seq), dev) {
	if (!list_empty(&dev->ptype_all)) {
	nxt = dev->ptype_all.next;
	goto found;
	}
	}

	nxt = ptype_all.next;
	goto ptype_all;
	}

	if (pt->type == htons(ETH_P_ALL)) {
	ptype_all:
	if (nxt != &ptype_all)
	goto found;
	hash = 0;
	nxt = ptype_base[0].next;
	} else
	hash = ntohs(pt->type) & PTYPE_HASH_MASK;

	while (nxt == &ptype_base[hash]) {
	if (++hash >= PTYPE_HASH_SIZE)
	return NULL;
	nxt = ptype_base[hash].next;
	}
	found:
	return list_entry(nxt, struct packet_type, list);
	}

	static void ptype_seq_stop(struct seq_file seq, void v)
	__releases(RCU)
	{
	rcu_read_unlock();
	}

	static int ptype_seq_show(struct seq_file seq, void v)
	{
	struct packet_type *pt = v;

	if (v == SEQ_START_TOKEN)
	seq_puts(seq, "Type Device Function\n");
	else if ((!pt->af_packet_net \|\| net_eq(pt->af_packet_net, seq_file_net(seq))) &&
	(!pt->dev \|\| net_eq(dev_net(pt->dev), seq_file_net(seq)))) {
	if (pt->type == htons(ETH_P_ALL))
	seq_puts(seq, "ALL ");
	else
	seq_printf(seq, "%04x", ntohs(pt->type));

	seq_printf(seq, " %-8s %ps\n",
	pt->dev ? pt->dev->name : "", pt->func);
	}

	return 0;
	}

	static const struct seq_operations ptype_seq_ops = {
	.start = ptype_seq_start,
	.next = ptype_seq_next,
	.stop = ptype_seq_stop,
	.show = ptype_seq_show,
	};

	static int __net_init dev_proc_net_init(struct net *net)
	{
	int rc = -ENOMEM;

	if (!proc_create_net("dev", 0444, net->proc_net, &dev_seq_ops,
	sizeof(struct seq_net_private)))
	goto out;
	if (!proc_create_seq("softnet_stat", 0444, net->proc_net,
	&softnet_seq_ops))
	goto out_dev;
	if (!proc_create_net("ptype", 0444, net->proc_net, &ptype_seq_ops,
	sizeof(struct seq_net_private)))
	goto out_softnet;

	if (wext_proc_init(net))
	goto out_ptype;
	rc = 0;
	out:
	return rc;
	out_ptype:
	remove_proc_entry("ptype", net->proc_net);
	out_softnet:
	remove_proc_entry("softnet_stat", net->proc_net);
	out_dev:
	remove_proc_entry("dev", net->proc_net);
	goto out;
	}

	static void __net_exit dev_proc_net_exit(struct net *net)
	{
	wext_proc_exit(net);

	remove_proc_entry("ptype", net->proc_net);
	remove_proc_entry("softnet_stat", net->proc_net);
	remove_proc_entry("dev", net->proc_net);
	}

	static struct pernet_operations __net_initdata dev_proc_ops = {
	.init = dev_proc_net_init,
	.exit = dev_proc_net_exit,
	};

	static int dev_mc_seq_show(struct seq_file seq, void v)
	{
	struct netdev_hw_addr *ha;
	struct net_device *dev = v;

	if (v == SEQ_START_TOKEN)
	return 0;

	netif_addr_lock_bh(dev);
	netdev_for_each_mc_addr(ha, dev) {
	seq_printf(seq, "%-4d %-15s %-5d %-5d %*phN\n",
	dev->ifindex, dev->name,
	ha->refcount, ha->global_use,
	(int)dev->addr_len, ha->addr);
	}
	netif_addr_unlock_bh(dev);
	return 0;
	}

	static const struct seq_operations dev_mc_seq_ops = {
	.start = dev_seq_start,
	.next = dev_seq_next,
	.stop = dev_seq_stop,
	.show = dev_mc_seq_show,
	};

	static int __net_init dev_mc_net_init(struct net *net)
	{
	if (!proc_create_net("dev_mcast", 0, net->proc_net, &dev_mc_seq_ops,
	sizeof(struct seq_net_private)))
	return -ENOMEM;
	return 0;
	}

	static void __net_exit dev_mc_net_exit(struct net *net)
	{
	remove_proc_entry("dev_mcast", net->proc_net);
	}

	static struct pernet_operations __net_initdata dev_mc_net_ops = {
	.init = dev_mc_net_init,
	.exit = dev_mc_net_exit,
	};

	int __init dev_proc_init(void)
	{
	int ret = register_pernet_subsys(&dev_proc_ops);
	if (!ret)
	return register_pernet_subsys(&dev_mc_net_ops);
	return ret;
	}