1 files changed, 322 insertions, 207 deletions

diff --git a/drivers/net/pppoe.c b/drivers/net/pppoe.c
index c22b30533a1..798b8cf5f9a 100644
--- a/drivers/net/pppoe.c
+++ b/drivers/net/pppoe.c
@@ -78,38 +78,73 @@
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 
+#include <linux/nsproxy.h>
 #include <net/net_namespace.h>
+#include <net/netns/generic.h>
 #include <net/sock.h>
 
 #include <asm/uaccess.h>
 
 #define PPPOE_HASH_BITS 4
-#define PPPOE_HASH_SIZE (1<<PPPOE_HASH_BITS)
-
-static struct ppp_channel_ops pppoe_chan_ops;
+#define PPPOE_HASH_SIZE (1 << PPPOE_HASH_BITS)
+#define PPPOE_HASH_MASK	(PPPOE_HASH_SIZE - 1)
 
 static int pppoe_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
 static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb);
 static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb);
 
 static const struct proto_ops pppoe_ops;
-static DEFINE_RWLOCK(pppoe_hash_lock);
-
 static struct ppp_channel_ops pppoe_chan_ops;
 
+/* per-net private data for this module */
+static unsigned int pppoe_net_id;
+struct pppoe_net {
+	/*
+	 * we could use _single_ hash table for all
+	 * nets by injecting net id into the hash but
+	 * it would increase hash chains and add
+	 * a few additional math comparations messy
+	 * as well, moreover in case of SMP less locking
+	 * controversy here
+	 */
+	struct pppox_sock *hash_table[PPPOE_HASH_SIZE];
+	rwlock_t hash_lock;
+};
+
+/* to eliminate a race btw pppoe_flush_dev and pppoe_release */
+static DEFINE_SPINLOCK(flush_lock);
+
+/*
+ * PPPoE could be in the following stages:
+ * 1) Discovery stage (to obtain remote MAC and Session ID)
+ * 2) Session stage (MAC and SID are known)
+ *
+ * Ethernet frames have a special tag for this but
+ * we use simplier approach based on session id
+ */
+static inline bool stage_session(__be16 sid)
+{
+	return sid != 0;
+}
+
+static inline struct pppoe_net *pppoe_pernet(struct net *net)
+{
+	BUG_ON(!net);
+
+	return net_generic(net, pppoe_net_id);
+}
+
 static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b)
 {
-	return (a->sid == b->sid &&
-		(memcmp(a->remote, b->remote, ETH_ALEN) == 0));
+	return a->sid == b->sid && !memcmp(a->remote, b->remote, ETH_ALEN);
 }
 
 static inline int cmp_addr(struct pppoe_addr *a, __be16 sid, char *addr)
 {
-	return (a->sid == sid &&
-		(memcmp(a->remote,addr,ETH_ALEN) == 0));
+	return a->sid == sid && !memcmp(a->remote, addr, ETH_ALEN);
 }
 
-#if 8%PPPOE_HASH_BITS
+#if 8 % PPPOE_HASH_BITS
 #error 8 must be a multiple of PPPOE_HASH_BITS
 #endif
 
@@ -118,69 +153,71 @@ static int hash_item(__be16 sid, unsigned char *addr)
 	unsigned char hash = 0;
 	unsigned int i;
 
-	for (i = 0 ; i < ETH_ALEN ; i++) {
+	for (i = 0; i < ETH_ALEN; i++)
 		hash ^= addr[i];
-	}
-	for (i = 0 ; i < sizeof(sid_t)*8 ; i += 8 ){
-		hash ^= (__force __u32)sid>>i;
-	}
-	for (i = 8 ; (i>>=1) >= PPPOE_HASH_BITS ; ) {
-		hash ^= hash>>i;
-	}
+	for (i = 0; i < sizeof(sid_t) * 8; i += 8)
+		hash ^= (__force __u32)sid >> i;
+	for (i = 8; (i >>= 1) >= PPPOE_HASH_BITS;)
+		hash ^= hash >> i;
 
-	return hash & ( PPPOE_HASH_SIZE - 1 );
+	return hash & PPPOE_HASH_MASK;
 }
 
-/* zeroed because its in .bss */
-static struct pppox_sock *item_hash_table[PPPOE_HASH_SIZE];
-
 /**********************************************************************
  *
  *  Set/get/delete/rehash items  (internal versions)
  *
  **********************************************************************/
-static struct pppox_sock *__get_item(__be16 sid, unsigned char *addr, int ifindex)
+static struct pppox_sock *__get_item(struct pppoe_net *pn, __be16 sid,
+				unsigned char *addr, int ifindex)
 {
 	int hash = hash_item(sid, addr);
 	struct pppox_sock *ret;
 
-	ret = item_hash_table[hash];
+	ret = pn->hash_table[hash];
+	while (ret) {
+		if (cmp_addr(&ret->pppoe_pa, sid, addr) &&
+		    ret->pppoe_ifindex == ifindex)
+			return ret;
 
-	while (ret && !(cmp_addr(&ret->pppoe_pa, sid, addr) && ret->pppoe_ifindex == ifindex))
 		ret = ret->next;
+	}
 
-	return ret;
+	return NULL;
 }
 
-static int __set_item(struct pppox_sock *po)
+static int __set_item(struct pppoe_net *pn, struct pppox_sock *po)
 {
 	int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
 	struct pppox_sock *ret;
 
-	ret = item_hash_table[hash];
+	ret = pn->hash_table[hash];
 	while (ret) {
-		if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) && ret->pppoe_ifindex == po->pppoe_ifindex)
+		if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) &&
+		    ret->pppoe_ifindex == po->pppoe_ifindex)
 			return -EALREADY;
 
 		ret = ret->next;
 	}
 
-	po->next = item_hash_table[hash];
-	item_hash_table[hash] = po;
+	po->next = pn->hash_table[hash];
+	pn->hash_table[hash] = po;
 
 	return 0;
 }
 
-static struct pppox_sock *__delete_item(__be16 sid, char *addr, int ifindex)
+static struct pppox_sock *__delete_item(struct pppoe_net *pn, __be16 sid,
+					char *addr, int ifindex)
 {
 	int hash = hash_item(sid, addr);
 	struct pppox_sock *ret, **src;
 
-	ret = item_hash_table[hash];
-	src = &item_hash_table[hash];
+	ret = pn->hash_table[hash];
+	src = &pn->hash_table[hash];
 
 	while (ret) {
-		if (cmp_addr(&ret->pppoe_pa, sid, addr) && ret->pppoe_ifindex == ifindex) {
+		if (cmp_addr(&ret->pppoe_pa, sid, addr) &&
+		    ret->pppoe_ifindex == ifindex) {
 			*src = ret->next;
 			break;
 		}
@@ -197,46 +234,54 @@ static struct pppox_sock *__delete_item(__be16 sid, char *addr, int ifindex)
  *  Set/get/delete/rehash items
  *
  **********************************************************************/
-static inline struct pppox_sock *get_item(__be16 sid,
-					 unsigned char *addr, int ifindex)
+static inline struct pppox_sock *get_item(struct pppoe_net *pn, __be16 sid,
+					unsigned char *addr, int ifindex)
 {
 	struct pppox_sock *po;
 
-	read_lock_bh(&pppoe_hash_lock);
-	po = __get_item(sid, addr, ifindex);
+	read_lock_bh(&pn->hash_lock);
+	po = __get_item(pn, sid, addr, ifindex);
 	if (po)
 		sock_hold(sk_pppox(po));
-	read_unlock_bh(&pppoe_hash_lock);
+	read_unlock_bh(&pn->hash_lock);
 
 	return po;
 }
 
-static inline struct pppox_sock *get_item_by_addr(struct sockaddr_pppox *sp)
+static inline struct pppox_sock *get_item_by_addr(struct net *net,
+						struct sockaddr_pppox *sp)
 {
 	struct net_device *dev;
+	struct pppoe_net *pn;
+	struct pppox_sock *pppox_sock;
+
 	int ifindex;
 
-	dev = dev_get_by_name(&init_net, sp->sa_addr.pppoe.dev);
-	if(!dev)
+	dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev);
+	if (!dev)
 		return NULL;
+
 	ifindex = dev->ifindex;
+	pn = net_generic(net, pppoe_net_id);
+	pppox_sock = get_item(pn, sp->sa_addr.pppoe.sid,
+				sp->sa_addr.pppoe.remote, ifindex);
 	dev_put(dev);
-	return get_item(sp->sa_addr.pppoe.sid, sp->sa_addr.pppoe.remote, ifindex);
+
+	return pppox_sock;
 }
 
-static inline struct pppox_sock *delete_item(__be16 sid, char *addr, int ifindex)
+static inline struct pppox_sock *delete_item(struct pppoe_net *pn, __be16 sid,
+					char *addr, int ifindex)
 {
 	struct pppox_sock *ret;
 
-	write_lock_bh(&pppoe_hash_lock);
-	ret = __delete_item(sid, addr, ifindex);
-	write_unlock_bh(&pppoe_hash_lock);
+	write_lock_bh(&pn->hash_lock);
+	ret = __delete_item(pn, sid, addr, ifindex);
+	write_unlock_bh(&pn->hash_lock);
 
 	return ret;
 }
 
-
-
 /***************************************************************************
  *
  *  Handler for device events.
@@ -246,25 +291,33 @@ static inline struct pppox_sock *delete_item(__be16 sid, char *addr, int ifindex
 
 static void pppoe_flush_dev(struct net_device *dev)
 {
-	int hash;
+	struct pppoe_net *pn;
+	int i;
+
 	BUG_ON(dev == NULL);
 
-	write_lock_bh(&pppoe_hash_lock);
-	for (hash = 0; hash < PPPOE_HASH_SIZE; hash++) {
-		struct pppox_sock *po = item_hash_table[hash];
+	pn = pppoe_pernet(dev_net(dev));
+	if (!pn) /* already freed */
+		return;
+
+	write_lock_bh(&pn->hash_lock);
+	for (i = 0; i < PPPOE_HASH_SIZE; i++) {
+		struct pppox_sock *po = pn->hash_table[i];
 
 		while (po != NULL) {
-			struct sock *sk = sk_pppox(po);
+			struct sock *sk;
 			if (po->pppoe_dev != dev) {
 				po = po->next;
 				continue;
 			}
+			sk = sk_pppox(po);
+			spin_lock(&flush_lock);
 			po->pppoe_dev = NULL;
+			spin_unlock(&flush_lock);
 			dev_put(dev);
 
-
 			/* We always grab the socket lock, followed by the
-			 * pppoe_hash_lock, in that order.  Since we should
+			 * hash_lock, in that order.  Since we should
 			 * hold the sock lock while doing any unbinding,
 			 * we need to release the lock we're holding.
 			 * Hold a reference to the sock so it doesn't disappear
@@ -273,7 +326,7 @@ static void pppoe_flush_dev(struct net_device *dev)
 
 			sock_hold(sk);
 
-			write_unlock_bh(&pppoe_hash_lock);
+			write_unlock_bh(&pn->hash_lock);
 			lock_sock(sk);
 
 			if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) {
@@ -289,20 +342,17 @@ static void pppoe_flush_dev(struct net_device *dev)
 			 * While the lock was dropped the chain contents may
 			 * have changed.
 			 */
-			write_lock_bh(&pppoe_hash_lock);
-			po = item_hash_table[hash];
+			write_lock_bh(&pn->hash_lock);
+			po = pn->hash_table[i];
 		}
 	}
-	write_unlock_bh(&pppoe_hash_lock);
+	write_unlock_bh(&pn->hash_lock);
 }
 
 static int pppoe_device_event(struct notifier_block *this,
 			      unsigned long event, void *ptr)
 {
-	struct net_device *dev = (struct net_device *) ptr;
-
-	if (dev_net(dev) != &init_net)
-		return NOTIFY_DONE;
+	struct net_device *dev = (struct net_device *)ptr;
 
 	/* Only look at sockets that are using this specific device. */
 	switch (event) {
@@ -324,12 +374,10 @@ static int pppoe_device_event(struct notifier_block *this,
 	return NOTIFY_DONE;
 }
 
-
 static struct notifier_block pppoe_notifier = {
 	.notifier_call = pppoe_device_event,
 };
 
-
 /************************************************************************
  *
  * Do the real work of receiving a PPPoE Session frame.
@@ -343,8 +391,8 @@ static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb)
 	if (sk->sk_state & PPPOX_BOUND) {
 		ppp_input(&po->chan, skb);
 	} else if (sk->sk_state & PPPOX_RELAY) {
-		relay_po = get_item_by_addr(&po->pppoe_relay);
-
+		relay_po = get_item_by_addr(dev_net(po->pppoe_dev),
+						&po->pppoe_relay);
 		if (relay_po == NULL)
 			goto abort_kfree;
 
@@ -373,22 +421,18 @@ abort_kfree:
  * Receive wrapper called in BH context.
  *
  ***********************************************************************/
-static int pppoe_rcv(struct sk_buff *skb,
-		     struct net_device *dev,
-		     struct packet_type *pt,
-		     struct net_device *orig_dev)
-
+static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev,
+		     struct packet_type *pt, struct net_device *orig_dev)
 {
 	struct pppoe_hdr *ph;
 	struct pppox_sock *po;
+	struct pppoe_net *pn;
 	int len;
 
-	if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
+	skb = skb_share_check(skb, GFP_ATOMIC);
+	if (!skb)
 		goto out;
 
-	if (dev_net(dev) != &init_net)
-		goto drop;
-
 	if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
 		goto drop;
 
@@ -402,7 +446,8 @@ static int pppoe_rcv(struct sk_buff *skb,
 	if (pskb_trim_rcsum(skb, len))
 		goto drop;
 
-	po = get_item(ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
+	pn = pppoe_pernet(dev_net(dev));
+	po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
 	if (!po)
 		goto drop;
 
@@ -420,19 +465,16 @@ out:
  * This is solely for detection of PADT frames
  *
  ***********************************************************************/
-static int pppoe_disc_rcv(struct sk_buff *skb,
-			  struct net_device *dev,
-			  struct packet_type *pt,
-			  struct net_device *orig_dev)
+static int pppoe_disc_rcv(struct sk_buff *skb, struct net_device *dev,
+			  struct packet_type *pt, struct net_device *orig_dev)
 
 {
 	struct pppoe_hdr *ph;
 	struct pppox_sock *po;
+	struct pppoe_net *pn;
 
-	if (dev_net(dev) != &init_net)
-		goto abort;
-
-	if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
+	skb = skb_share_check(skb, GFP_ATOMIC);
+	if (!skb)
 		goto out;
 
 	if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
@@ -442,7 +484,8 @@ static int pppoe_disc_rcv(struct sk_buff *skb,
 	if (ph->code != PADT_CODE)
 		goto abort;
 
-	po = get_item(ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
+	pn = pppoe_pernet(dev_net(dev));
+	po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
 	if (po) {
 		struct sock *sk = sk_pppox(po);
 
@@ -493,38 +536,37 @@ static struct proto pppoe_sk_proto = {
  **********************************************************************/
 static int pppoe_create(struct net *net, struct socket *sock)
 {
-	int error = -ENOMEM;
 	struct sock *sk;
 
 	sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto);
 	if (!sk)
-		goto out;
+		return -ENOMEM;
 
 	sock_init_data(sock, sk);
 
-	sock->state = SS_UNCONNECTED;
-	sock->ops   = &pppoe_ops;
+	sock->state	= SS_UNCONNECTED;
+	sock->ops	= &pppoe_ops;
 
-	sk->sk_backlog_rcv = pppoe_rcv_core;
-	sk->sk_state	   = PPPOX_NONE;
-	sk->sk_type	   = SOCK_STREAM;
-	sk->sk_family	   = PF_PPPOX;
-	sk->sk_protocol	   = PX_PROTO_OE;
+	sk->sk_backlog_rcv	= pppoe_rcv_core;
+	sk->sk_state		= PPPOX_NONE;
+	sk->sk_type		= SOCK_STREAM;
+	sk->sk_family		= PF_PPPOX;
+	sk->sk_protocol		= PX_PROTO_OE;
 
-	error = 0;
-out:	return error;
+	return 0;
 }
 
 static int pppoe_release(struct socket *sock)
 {
 	struct sock *sk = sock->sk;
 	struct pppox_sock *po;
+	struct pppoe_net *pn;
 
 	if (!sk)
 		return 0;
 
 	lock_sock(sk);
-	if (sock_flag(sk, SOCK_DEAD)){
+	if (sock_flag(sk, SOCK_DEAD)) {
 		release_sock(sk);
 		return -EBADF;
 	}
@@ -534,26 +576,39 @@ static int pppoe_release(struct socket *sock)
 	/* Signal the death of the socket. */
 	sk->sk_state = PPPOX_DEAD;
 
+	/*
+	 * pppoe_flush_dev could lead to a race with
+	 * this routine so we use flush_lock to eliminate
+	 * such a case (we only need per-net specific data)
+	 */
+	spin_lock(&flush_lock);
+	po = pppox_sk(sk);
+	if (!po->pppoe_dev) {
+		spin_unlock(&flush_lock);
+		goto out;
+	}
+	pn = pppoe_pernet(dev_net(po->pppoe_dev));
+	spin_unlock(&flush_lock);
 
-	/* Write lock on hash lock protects the entire "po" struct from
-	 * concurrent updates via pppoe_flush_dev. The "po" struct should
-	 * be considered part of the hash table contents, thus protected
-	 * by the hash table lock */
-	write_lock_bh(&pppoe_hash_lock);
+	/*
+	 * protect "po" from concurrent updates
+	 * on pppoe_flush_dev
+	 */
+	write_lock_bh(&pn->hash_lock);
 
 	po = pppox_sk(sk);
-	if (po->pppoe_pa.sid) {
-		__delete_item(po->pppoe_pa.sid,
-			      po->pppoe_pa.remote, po->pppoe_ifindex);
-	}
+	if (stage_session(po->pppoe_pa.sid))
+		__delete_item(pn, po->pppoe_pa.sid, po->pppoe_pa.remote,
+				po->pppoe_ifindex);
 
 	if (po->pppoe_dev) {
 		dev_put(po->pppoe_dev);
 		po->pppoe_dev = NULL;
 	}
 
-	write_unlock_bh(&pppoe_hash_lock);
+	write_unlock_bh(&pn->hash_lock);
 
+out:
 	sock_orphan(sk);
 	sock->sk = NULL;
 
@@ -564,14 +619,14 @@ static int pppoe_release(struct socket *sock)
 	return 0;
 }
 
-
 static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
 		  int sockaddr_len, int flags)
 {
 	struct sock *sk = sock->sk;
-	struct net_device *dev;
-	struct sockaddr_pppox *sp = (struct sockaddr_pppox *) uservaddr;
+	struct sockaddr_pppox *sp = (struct sockaddr_pppox *)uservaddr;
 	struct pppox_sock *po = pppox_sk(sk);
+	struct net_device *dev;
+	struct pppoe_net *pn;
 	int error;
 
 	lock_sock(sk);
@@ -582,44 +637,45 @@ static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
 
 	/* Check for already bound sockets */
 	error = -EBUSY;
-	if ((sk->sk_state & PPPOX_CONNECTED) && sp->sa_addr.pppoe.sid)
+	if ((sk->sk_state & PPPOX_CONNECTED) &&
+	     stage_session(sp->sa_addr.pppoe.sid))
 		goto end;
 
 	/* Check for already disconnected sockets, on attempts to disconnect */
 	error = -EALREADY;
-	if ((sk->sk_state & PPPOX_DEAD) && !sp->sa_addr.pppoe.sid )
+	if ((sk->sk_state & PPPOX_DEAD) &&
+	     !stage_session(sp->sa_addr.pppoe.sid))
 		goto end;
 
 	error = 0;
-	if (po->pppoe_pa.sid) {
-		pppox_unbind_sock(sk);
 
-		/* Delete the old binding */
-		delete_item(po->pppoe_pa.sid,po->pppoe_pa.remote,po->pppoe_ifindex);
-
-		if(po->pppoe_dev)
+	/* Delete the old binding */
+	if (stage_session(po->pppoe_pa.sid)) {
+		pppox_unbind_sock(sk);
+		if (po->pppoe_dev) {
+			pn = pppoe_pernet(dev_net(po->pppoe_dev));
+			delete_item(pn, po->pppoe_pa.sid,
+				po->pppoe_pa.remote, po->pppoe_ifindex);
 			dev_put(po->pppoe_dev);
-
+		}
 		memset(sk_pppox(po) + 1, 0,
 		       sizeof(struct pppox_sock) - sizeof(struct sock));
-
 		sk->sk_state = PPPOX_NONE;
 	}
 
-	/* Don't re-bind if sid==0 */
-	if (sp->sa_addr.pppoe.sid != 0) {
-		dev = dev_get_by_name(&init_net, sp->sa_addr.pppoe.dev);
-
+	/* Re-bind in session stage only */
+	if (stage_session(sp->sa_addr.pppoe.sid)) {
 		error = -ENODEV;
+		dev = dev_get_by_name(sock_net(sk), sp->sa_addr.pppoe.dev);
 		if (!dev)
 			goto end;
 
 		po->pppoe_dev = dev;
 		po->pppoe_ifindex = dev->ifindex;
-
-		write_lock_bh(&pppoe_hash_lock);
-		if (!(dev->flags & IFF_UP)){
-			write_unlock_bh(&pppoe_hash_lock);
+		pn = pppoe_pernet(dev_net(dev));
+		write_lock_bh(&pn->hash_lock);
+		if (!(dev->flags & IFF_UP)) {
+			write_unlock_bh(&pn->hash_lock);
 			goto err_put;
 		}
 
@@ -627,8 +683,8 @@ static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
 		       &sp->sa_addr.pppoe,
 		       sizeof(struct pppoe_addr));
 
-		error = __set_item(po);
-		write_unlock_bh(&pppoe_hash_lock);
+		error = __set_item(pn, po);
+		write_unlock_bh(&pn->hash_lock);
 		if (error < 0)
 			goto err_put;
 
@@ -639,7 +695,7 @@ static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
 		po->chan.private = sk;
 		po->chan.ops = &pppoe_chan_ops;
 
-		error = ppp_register_channel(&po->chan);
+		error = ppp_register_net_channel(dev_net(dev), &po->chan);
 		if (error)
 			goto err_put;
 
@@ -648,7 +704,7 @@ static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
 
 	po->num = sp->sa_addr.pppoe.sid;
 
- end:
+end:
 	release_sock(sk);
 	return error;
 err_put:
@@ -659,7 +715,6 @@ err_put:
 	goto end;
 }
 
-
 static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr,
 		  int *usockaddr_len, int peer)
 {
@@ -678,7 +733,6 @@ static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr,
 	return 0;
 }
 
-
 static int pppoe_ioctl(struct socket *sock, unsigned int cmd,
 		unsigned long arg)
 {
@@ -690,7 +744,6 @@ static int pppoe_ioctl(struct socket *sock, unsigned int cmd,
 	switch (cmd) {
 	case PPPIOCGMRU:
 		err = -ENXIO;
-
 		if (!(sk->sk_state & PPPOX_CONNECTED))
 			break;
 
@@ -698,7 +751,7 @@ static int pppoe_ioctl(struct socket *sock, unsigned int cmd,
 		if (put_user(po->pppoe_dev->mtu -
 			     sizeof(struct pppoe_hdr) -
 			     PPP_HDRLEN,
-			     (int __user *) arg))
+			     (int __user *)arg))
 			break;
 		err = 0;
 		break;
@@ -709,7 +762,7 @@ static int pppoe_ioctl(struct socket *sock, unsigned int cmd,
 			break;
 
 		err = -EFAULT;
-		if (get_user(val,(int __user *) arg))
+		if (get_user(val, (int __user *)arg))
 			break;
 
 		if (val < (po->pppoe_dev->mtu
@@ -722,7 +775,7 @@ static int pppoe_ioctl(struct socket *sock, unsigned int cmd,
 
 	case PPPIOCSFLAGS:
 		err = -EFAULT;
-		if (get_user(val, (int __user *) arg))
+		if (get_user(val, (int __user *)arg))
 			break;
 		err = 0;
 		break;
@@ -749,13 +802,12 @@ static int pppoe_ioctl(struct socket *sock, unsigned int cmd,
 
 		err = -EINVAL;
 		if (po->pppoe_relay.sa_family != AF_PPPOX ||
-		    po->pppoe_relay.sa_protocol!= PX_PROTO_OE)
+		    po->pppoe_relay.sa_protocol != PX_PROTO_OE)
 			break;
 
 		/* Check that the socket referenced by the address
 		   actually exists. */
-		relay_po = get_item_by_addr(&po->pppoe_relay);
-
+		relay_po = get_item_by_addr(sock_net(sk), &po->pppoe_relay);
 		if (!relay_po)
 			break;
 
@@ -781,7 +833,6 @@ static int pppoe_ioctl(struct socket *sock, unsigned int cmd,
 	return err;
 }
 
-
 static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock,
 		  struct msghdr *m, size_t total_len)
 {
@@ -808,7 +859,7 @@ static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock,
 	dev = po->pppoe_dev;
 
 	error = -EMSGSIZE;
- 	if (total_len > (dev->mtu + dev->hard_header_len))
+	if (total_len > (dev->mtu + dev->hard_header_len))
 		goto end;
 
 
@@ -828,11 +879,10 @@ static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock,
 	skb->priority = sk->sk_priority;
 	skb->protocol = __constant_htons(ETH_P_PPP_SES);
 
-	ph = (struct pppoe_hdr *) skb_put(skb, total_len + sizeof(struct pppoe_hdr));
-	start = (char *) &ph->tag[0];
+	ph = (struct pppoe_hdr *)skb_put(skb, total_len + sizeof(struct pppoe_hdr));
+	start = (char *)&ph->tag[0];
 
 	error = memcpy_fromiovec(start, m->msg_iov, total_len);
-
 	if (error < 0) {
 		kfree_skb(skb);
 		goto end;
@@ -853,7 +903,6 @@ end:
 	return error;
 }
 
-
 /************************************************************************
  *
  * xmit function for internal use.
@@ -903,7 +952,6 @@ abort:
 	return 1;
 }
 
-
 /************************************************************************
  *
  * xmit function called by generic PPP driver
@@ -912,11 +960,10 @@ abort:
  ***********************************************************************/
 static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb)
 {
-	struct sock *sk = (struct sock *) chan->private;
+	struct sock *sk = (struct sock *)chan->private;
 	return __pppoe_xmit(sk, skb);
 }
 
-
 static struct ppp_channel_ops pppoe_chan_ops = {
 	.start_xmit = pppoe_xmit,
 };
@@ -935,7 +982,6 @@ static int pppoe_recvmsg(struct kiocb *iocb, struct socket *sock,
 
 	skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
 				flags & MSG_DONTWAIT, &error);
-
 	if (error < 0)
 		goto end;
 
@@ -968,44 +1014,47 @@ static int pppoe_seq_show(struct seq_file *seq, void *v)
 	dev_name = po->pppoe_pa.dev;
 
 	seq_printf(seq, "%08X %pM %8s\n",
-		   po->pppoe_pa.sid, po->pppoe_pa.remote, dev_name);
+		po->pppoe_pa.sid, po->pppoe_pa.remote, dev_name);
 out:
 	return 0;
 }
 
-static __inline__ struct pppox_sock *pppoe_get_idx(loff_t pos)
+static inline struct pppox_sock *pppoe_get_idx(struct pppoe_net *pn, loff_t pos)
 {
 	struct pppox_sock *po;
-	int i = 0;
+	int i;
 
-	for (; i < PPPOE_HASH_SIZE; i++) {
-		po = item_hash_table[i];
+	for (i = 0; i < PPPOE_HASH_SIZE; i++) {
+		po = pn->hash_table[i];
 		while (po) {
 			if (!pos--)
 				goto out;
 			po = po->next;
 		}
 	}
+
 out:
 	return po;
 }
 
 static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos)
-	__acquires(pppoe_hash_lock)
+	__acquires(pn->hash_lock)
 {
+	struct pppoe_net *pn = pppoe_pernet(seq->private);
 	loff_t l = *pos;
 
-	read_lock_bh(&pppoe_hash_lock);
-	return l ? pppoe_get_idx(--l) : SEQ_START_TOKEN;
+	read_lock_bh(&pn->hash_lock);
+	return l ? pppoe_get_idx(pn, --l) : SEQ_START_TOKEN;
 }
 
 static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
+	struct pppoe_net *pn = pppoe_pernet(seq->private);
 	struct pppox_sock *po;
 
 	++*pos;
 	if (v == SEQ_START_TOKEN) {
-		po = pppoe_get_idx(0);
+		po = pppoe_get_idx(pn, 0);
 		goto out;
 	}
 	po = v;
@@ -1015,22 +1064,24 @@ static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 		int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
 
 		while (++hash < PPPOE_HASH_SIZE) {
-			po = item_hash_table[hash];
+			po = pn->hash_table[hash];
 			if (po)
 				break;
 		}
 	}
+
 out:
 	return po;
 }
 
 static void pppoe_seq_stop(struct seq_file *seq, void *v)
-	__releases(pppoe_hash_lock)
+	__releases(pn->hash_lock)
 {
-	read_unlock_bh(&pppoe_hash_lock);
+	struct pppoe_net *pn = pppoe_pernet(seq->private);
+	read_unlock_bh(&pn->hash_lock);
 }
 
-static struct seq_operations pppoe_seq_ops = {
+static const struct seq_operations pppoe_seq_ops = {
 	.start		= pppoe_seq_start,
 	.next		= pppoe_seq_next,
 	.stop		= pppoe_seq_stop,
@@ -1039,7 +1090,30 @@ static struct seq_operations pppoe_seq_ops = {
 
 static int pppoe_seq_open(struct inode *inode, struct file *file)
 {
-	return seq_open(file, &pppoe_seq_ops);
+	struct seq_file *m;
+	struct net *net;
+	int err;
+
+	err = seq_open(file, &pppoe_seq_ops);
+	if (err)
+		return err;
+
+	m = file->private_data;
+	net = maybe_get_net(PDE_NET(PDE(inode)));
+	BUG_ON(!net);
+	m->private = net;
+
+	return err;
+}
+
+static int pppoe_seq_release(struct inode *inode, struct file *file)
+{
+	struct seq_file *m;
+
+	m = file->private_data;
+	put_net((struct net*)m->private);
+
+	return seq_release(inode, file);
 }
 
 static const struct file_operations pppoe_seq_fops = {
@@ -1047,74 +1121,115 @@ static const struct file_operations pppoe_seq_fops = {
 	.open		= pppoe_seq_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
-	.release	= seq_release,
+	.release	= pppoe_seq_release,
 };
 
-static int __init pppoe_proc_init(void)
-{
-	struct proc_dir_entry *p;
-
-	p = proc_net_fops_create(&init_net, "pppoe", S_IRUGO, &pppoe_seq_fops);
-	if (!p)
-		return -ENOMEM;
-	return 0;
-}
-#else /* CONFIG_PROC_FS */
-static inline int pppoe_proc_init(void) { return 0; }
 #endif /* CONFIG_PROC_FS */
 
 static const struct proto_ops pppoe_ops = {
-    .family		= AF_PPPOX,
-    .owner		= THIS_MODULE,
-    .release		= pppoe_release,
-    .bind		= sock_no_bind,
-    .connect		= pppoe_connect,
-    .socketpair		= sock_no_socketpair,
-    .accept		= sock_no_accept,
-    .getname		= pppoe_getname,
-    .poll		= datagram_poll,
-    .listen		= sock_no_listen,
-    .shutdown		= sock_no_shutdown,
-    .setsockopt		= sock_no_setsockopt,
-    .getsockopt		= sock_no_getsockopt,
-    .sendmsg		= pppoe_sendmsg,
-    .recvmsg		= pppoe_recvmsg,
-    .mmap		= sock_no_mmap,
-    .ioctl		= pppox_ioctl,
+	.family		= AF_PPPOX,
+	.owner		= THIS_MODULE,
+	.release	= pppoe_release,
+	.bind		= sock_no_bind,
+	.connect	= pppoe_connect,
+	.socketpair	= sock_no_socketpair,
+	.accept		= sock_no_accept,
+	.getname	= pppoe_getname,
+	.poll		= datagram_poll,
+	.listen		= sock_no_listen,
+	.shutdown	= sock_no_shutdown,
+	.setsockopt	= sock_no_setsockopt,
+	.getsockopt	= sock_no_getsockopt,
+	.sendmsg	= pppoe_sendmsg,
+	.recvmsg	= pppoe_recvmsg,
+	.mmap		= sock_no_mmap,
+	.ioctl		= pppox_ioctl,
 };
 
 static struct pppox_proto pppoe_proto = {
-    .create	= pppoe_create,
-    .ioctl	= pppoe_ioctl,
-    .owner	= THIS_MODULE,
+	.create	= pppoe_create,
+	.ioctl	= pppoe_ioctl,
+	.owner	= THIS_MODULE,
 };
 
+static __net_init int pppoe_init_net(struct net *net)
+{
+	struct pppoe_net *pn;
+	struct proc_dir_entry *pde;
+	int err;
+
+	pn = kzalloc(sizeof(*pn), GFP_KERNEL);
+	if (!pn)
+		return -ENOMEM;
+
+	rwlock_init(&pn->hash_lock);
+
+	err = net_assign_generic(net, pppoe_net_id, pn);
+	if (err)
+		goto out;
+
+	pde = proc_net_fops_create(net, "pppoe", S_IRUGO, &pppoe_seq_fops);
+#ifdef CONFIG_PROC_FS
+	if (!pde) {
+		err = -ENOMEM;
+		goto out;
+	}
+#endif
+
+	return 0;
+
+out:
+	kfree(pn);
+	return err;
+}
+
+static __net_exit void pppoe_exit_net(struct net *net)
+{
+	struct pppoe_net *pn;
+
+	proc_net_remove(net, "pppoe");
+	pn = net_generic(net, pppoe_net_id);
+	/*
+	 * if someone has cached our net then
+	 * further net_generic call will return NULL
+	 */
+	net_assign_generic(net, pppoe_net_id, NULL);
+	kfree(pn);
+}
+
+static __net_initdata struct pernet_operations pppoe_net_ops = {
+	.init = pppoe_init_net,
+	.exit = pppoe_exit_net,
+};
 
 static int __init pppoe_init(void)
 {
-	int err = proto_register(&pppoe_sk_proto, 0);
+	int err;
 
+	err = proto_register(&pppoe_sk_proto, 0);
 	if (err)
 		goto out;
 
- 	err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto);
+	err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto);
 	if (err)
 		goto out_unregister_pppoe_proto;
 
-	err = pppoe_proc_init();
+	err = register_pernet_gen_device(&pppoe_net_id, &pppoe_net_ops);
 	if (err)
 		goto out_unregister_pppox_proto;
 
 	dev_add_pack(&pppoes_ptype);
 	dev_add_pack(&pppoed_ptype);
 	register_netdevice_notifier(&pppoe_notifier);
-out:
-	return err;
+
+	return 0;
+
 out_unregister_pppox_proto:
 	unregister_pppox_proto(PX_PROTO_OE);
 out_unregister_pppoe_proto:
 	proto_unregister(&pppoe_sk_proto);
-	goto out;
+out:
+	return err;
 }
 
 static void __exit pppoe_exit(void)
@@ -1123,7 +1238,7 @@ static void __exit pppoe_exit(void)
 	dev_remove_pack(&pppoes_ptype);
 	dev_remove_pack(&pppoed_ptype);
 	unregister_netdevice_notifier(&pppoe_notifier);
-	remove_proc_entry("pppoe", init_net.proc_net);
+	unregister_pernet_gen_device(pppoe_net_id, &pppoe_net_ops);
 	proto_unregister(&pppoe_sk_proto);
 }