af_packet.c 58.0 KB
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/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		PACKET - implements raw packet sockets.
 *
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 * Authors:	Ross Biro
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 *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *		Alan Cox, <gw4pts@gw4pts.ampr.org>
 *
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 * Fixes:
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 *		Alan Cox	:	verify_area() now used correctly
 *		Alan Cox	:	new skbuff lists, look ma no backlogs!
 *		Alan Cox	:	tidied skbuff lists.
 *		Alan Cox	:	Now uses generic datagram routines I
 *					added. Also fixed the peek/read crash
 *					from all old Linux datagram code.
 *		Alan Cox	:	Uses the improved datagram code.
 *		Alan Cox	:	Added NULL's for socket options.
 *		Alan Cox	:	Re-commented the code.
 *		Alan Cox	:	Use new kernel side addressing
 *		Rob Janssen	:	Correct MTU usage.
 *		Dave Platt	:	Counter leaks caused by incorrect
 *					interrupt locking and some slightly
 *					dubious gcc output. Can you read
 *					compiler: it said _VOLATILE_
 *	Richard Kooijman	:	Timestamp fixes.
 *		Alan Cox	:	New buffers. Use sk->mac.raw.
 *		Alan Cox	:	sendmsg/recvmsg support.
 *		Alan Cox	:	Protocol setting support
 *	Alexey Kuznetsov	:	Untied from IPv4 stack.
 *	Cyrus Durgin		:	Fixed kerneld for kmod.
 *	Michal Ostrowski        :       Module initialization cleanup.
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 *         Ulises Alonso        :       Frame number limit removal and
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 *                                      packet_set_ring memory leak.
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 *		Eric Biederman	:	Allow for > 8 byte hardware addresses.
 *					The convention is that longer addresses
 *					will simply extend the hardware address
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 *					byte arrays at the end of sockaddr_ll
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 *					and packet_mreq.
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 *		Johann Baudy	:	Added TX RING.
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 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 */
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#include <linux/types.h>
#include <linux/mm.h>
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#include <linux/capability.h>
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#include <linux/fcntl.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/if_packet.h>
#include <linux/wireless.h>
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#include <linux/kernel.h>
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#include <linux/kmod.h>
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#include <net/net_namespace.h>
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#include <net/ip.h>
#include <net/protocol.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <linux/errno.h>
#include <linux/timer.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/ioctls.h>
#include <asm/page.h>
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#include <asm/cacheflush.h>
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#include <asm/io.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/poll.h>
#include <linux/module.h>
#include <linux/init.h>
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#include <linux/mutex.h>
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#include <linux/if_vlan.h>
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#include <linux/virtio_net.h>
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#ifdef CONFIG_INET
#include <net/inet_common.h>
#endif

/*
   Assumptions:
   - if device has no dev->hard_header routine, it adds and removes ll header
     inside itself. In this case ll header is invisible outside of device,
     but higher levels still should reserve dev->hard_header_len.
     Some devices are enough clever to reallocate skb, when header
     will not fit to reserved space (tunnel), another ones are silly
     (PPP).
   - packet socket receives packets with pulled ll header,
     so that SOCK_RAW should push it back.

On receive:
-----------

Incoming, dev->hard_header!=NULL
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   mac_header -> ll header
   data       -> data
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Outgoing, dev->hard_header!=NULL
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   mac_header -> ll header
   data       -> ll header
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Incoming, dev->hard_header==NULL
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   mac_header -> UNKNOWN position. It is very likely, that it points to ll
		 header.  PPP makes it, that is wrong, because introduce
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		 assymetry between rx and tx paths.
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   data       -> data
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Outgoing, dev->hard_header==NULL
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   mac_header -> data. ll header is still not built!
   data       -> data
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Resume
  If dev->hard_header==NULL we are unlikely to restore sensible ll header.


On transmit:
------------

dev->hard_header != NULL
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   mac_header -> ll header
   data       -> ll header
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dev->hard_header == NULL (ll header is added by device, we cannot control it)
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   mac_header -> data
   data       -> data
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   We should set nh.raw on output to correct posistion,
   packet classifier depends on it.
 */

/* Private packet socket structures. */

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struct packet_mclist {
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	struct packet_mclist	*next;
	int			ifindex;
	int			count;
	unsigned short		type;
	unsigned short		alen;
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	unsigned char		addr[MAX_ADDR_LEN];
};
/* identical to struct packet_mreq except it has
 * a longer address field.
 */
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struct packet_mreq_max {
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	int		mr_ifindex;
	unsigned short	mr_type;
	unsigned short	mr_alen;
	unsigned char	mr_address[MAX_ADDR_LEN];
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};
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static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
		int closing, int tx_ring);

struct packet_ring_buffer {
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	char			**pg_vec;
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	unsigned int		head;
	unsigned int		frames_per_block;
	unsigned int		frame_size;
	unsigned int		frame_max;

	unsigned int		pg_vec_order;
	unsigned int		pg_vec_pages;
	unsigned int		pg_vec_len;

	atomic_t		pending;
};

struct packet_sock;
static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
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static void packet_flush_mclist(struct sock *sk);

struct packet_sock {
	/* struct sock has to be the first member of packet_sock */
	struct sock		sk;
	struct tpacket_stats	stats;
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	struct packet_ring_buffer	rx_ring;
	struct packet_ring_buffer	tx_ring;
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	int			copy_thresh;
	spinlock_t		bind_lock;
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	struct mutex		pg_vec_lock;
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	unsigned int		running:1,	/* prot_hook is attached*/
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				auxdata:1,
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				origdev:1,
				has_vnet_hdr:1;
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	int			ifindex;	/* bound device		*/
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	__be16			num;
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	struct packet_mclist	*mclist;
	atomic_t		mapped;
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	enum tpacket_versions	tp_version;
	unsigned int		tp_hdrlen;
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	unsigned int		tp_reserve;
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	unsigned int		tp_loss:1;
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	struct packet_type	prot_hook ____cacheline_aligned_in_smp;
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};

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struct packet_skb_cb {
	unsigned int origlen;
	union {
		struct sockaddr_pkt pkt;
		struct sockaddr_ll ll;
	} sa;
};

#define PACKET_SKB_CB(__skb)	((struct packet_skb_cb *)((__skb)->cb))
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static void __packet_set_status(struct packet_sock *po, void *frame, int status)
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{
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	union {
		struct tpacket_hdr *h1;
		struct tpacket2_hdr *h2;
		void *raw;
	} h;
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	h.raw = frame;
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	switch (po->tp_version) {
	case TPACKET_V1:
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		h.h1->tp_status = status;
		flush_dcache_page(virt_to_page(&h.h1->tp_status));
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		break;
	case TPACKET_V2:
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		h.h2->tp_status = status;
		flush_dcache_page(virt_to_page(&h.h2->tp_status));
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		break;
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	default:
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		pr_err("TPACKET version not supported\n");
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		BUG();
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	}
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	smp_wmb();
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}

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static int __packet_get_status(struct packet_sock *po, void *frame)
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{
	union {
		struct tpacket_hdr *h1;
		struct tpacket2_hdr *h2;
		void *raw;
	} h;

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	smp_rmb();

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	h.raw = frame;
	switch (po->tp_version) {
	case TPACKET_V1:
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		flush_dcache_page(virt_to_page(&h.h1->tp_status));
		return h.h1->tp_status;
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	case TPACKET_V2:
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		flush_dcache_page(virt_to_page(&h.h2->tp_status));
		return h.h2->tp_status;
	default:
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		pr_err("TPACKET version not supported\n");
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		BUG();
		return 0;
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	}
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}
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static void *packet_lookup_frame(struct packet_sock *po,
		struct packet_ring_buffer *rb,
		unsigned int position,
		int status)
{
	unsigned int pg_vec_pos, frame_offset;
	union {
		struct tpacket_hdr *h1;
		struct tpacket2_hdr *h2;
		void *raw;
	} h;

	pg_vec_pos = position / rb->frames_per_block;
	frame_offset = position % rb->frames_per_block;

	h.raw = rb->pg_vec[pg_vec_pos] + (frame_offset * rb->frame_size);

	if (status != __packet_get_status(po, h.raw))
		return NULL;

	return h.raw;
}

static inline void *packet_current_frame(struct packet_sock *po,
		struct packet_ring_buffer *rb,
		int status)
{
	return packet_lookup_frame(po, rb, rb->head, status);
}

static inline void *packet_previous_frame(struct packet_sock *po,
		struct packet_ring_buffer *rb,
		int status)
{
	unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
	return packet_lookup_frame(po, rb, previous, status);
}

static inline void packet_increment_head(struct packet_ring_buffer *buff)
{
	buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
}

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static inline struct packet_sock *pkt_sk(struct sock *sk)
{
	return (struct packet_sock *)sk;
}

static void packet_sock_destruct(struct sock *sk)
{
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	WARN_ON(atomic_read(&sk->sk_rmem_alloc));
	WARN_ON(atomic_read(&sk->sk_wmem_alloc));
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	if (!sock_flag(sk, SOCK_DEAD)) {
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		pr_err("Attempt to release alive packet socket: %p\n", sk);
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		return;
	}

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	sk_refcnt_debug_dec(sk);
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}


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static const struct proto_ops packet_ops;
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static const struct proto_ops packet_ops_spkt;
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static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
			   struct packet_type *pt, struct net_device *orig_dev)
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{
	struct sock *sk;
	struct sockaddr_pkt *spkt;

	/*
	 *	When we registered the protocol we saved the socket in the data
	 *	field for just this event.
	 */

	sk = pt->af_packet_priv;
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	/*
	 *	Yank back the headers [hope the device set this
	 *	right or kerboom...]
	 *
	 *	Incoming packets have ll header pulled,
	 *	push it back.
	 *
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	 *	For outgoing ones skb->data == skb_mac_header(skb)
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	 *	so that this procedure is noop.
	 */

	if (skb->pkt_type == PACKET_LOOPBACK)
		goto out;

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	if (!net_eq(dev_net(dev), sock_net(sk)))
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		goto out;

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	skb = skb_share_check(skb, GFP_ATOMIC);
	if (skb == NULL)
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		goto oom;

	/* drop any routing info */
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	skb_dst_drop(skb);
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	/* drop conntrack reference */
	nf_reset(skb);

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	spkt = &PACKET_SKB_CB(skb)->sa.pkt;
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	skb_push(skb, skb->data - skb_mac_header(skb));
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	/*
	 *	The SOCK_PACKET socket receives _all_ frames.
	 */

	spkt->spkt_family = dev->type;
	strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
	spkt->spkt_protocol = skb->protocol;

	/*
	 *	Charge the memory to the socket. This is done specifically
	 *	to prevent sockets using all the memory up.
	 */

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	if (sock_queue_rcv_skb(sk, skb) == 0)
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		return 0;

out:
	kfree_skb(skb);
oom:
	return 0;
}


/*
 *	Output a raw packet to a device layer. This bypasses all the other
 *	protocol layers and you must therefore supply it with a complete frame
 */
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static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
			       struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
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	struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name;
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	struct sk_buff *skb = NULL;
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	struct net_device *dev;
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	__be16 proto = 0;
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	int err;
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	/*
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	 *	Get and verify the address.
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	 */

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	if (saddr) {
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		if (msg->msg_namelen < sizeof(struct sockaddr))
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			return -EINVAL;
		if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
			proto = saddr->spkt_protocol;
	} else
		return -ENOTCONN;	/* SOCK_PACKET must be sent giving an address */
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	/*
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	 *	Find the device first to size check it
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	 */

	saddr->spkt_device[13] = 0;
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retry:
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	rcu_read_lock();
	dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
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	err = -ENODEV;
	if (dev == NULL)
		goto out_unlock;
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	err = -ENETDOWN;
	if (!(dev->flags & IFF_UP))
		goto out_unlock;

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	/*
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	 * You may not queue a frame bigger than the mtu. This is the lowest level
	 * raw protocol and you must do your own fragmentation at this level.
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	 */
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	err = -EMSGSIZE;
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	if (len > dev->mtu + dev->hard_header_len)
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		goto out_unlock;

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	if (!skb) {
		size_t reserved = LL_RESERVED_SPACE(dev);
		unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;

		rcu_read_unlock();
		skb = sock_wmalloc(sk, len + reserved, 0, GFP_KERNEL);
		if (skb == NULL)
			return -ENOBUFS;
		/* FIXME: Save some space for broken drivers that write a hard
		 * header at transmission time by themselves. PPP is the notable
		 * one here. This should really be fixed at the driver level.
		 */
		skb_reserve(skb, reserved);
		skb_reset_network_header(skb);

		/* Try to align data part correctly */
		if (hhlen) {
			skb->data -= hhlen;
			skb->tail -= hhlen;
			if (len < hhlen)
				skb_reset_network_header(skb);
		}
		err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
		if (err)
			goto out_free;
		goto retry;
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	}

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	skb->protocol = proto;
	skb->dev = dev;
	skb->priority = sk->sk_priority;
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	skb->mark = sk->sk_mark;
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	dev_queue_xmit(skb);
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	rcu_read_unlock();
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	return len;
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out_unlock:
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	rcu_read_unlock();
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out_free:
	kfree_skb(skb);
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	return err;
}

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static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk,
				      unsigned int res)
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{
	struct sk_filter *filter;
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	rcu_read_lock_bh();
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	filter = rcu_dereference_bh(sk->sk_filter);
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	if (filter != NULL)
		res = sk_run_filter(skb, filter->insns, filter->len);
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	rcu_read_unlock_bh();
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	return res;
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}

/*
   This function makes lazy skb cloning in hope that most of packets
   are discarded by BPF.

   Note tricky part: we DO mangle shared skb! skb->data, skb->len
   and skb->cb are mangled. It works because (and until) packets
   falling here are owned by current CPU. Output packets are cloned
   by dev_queue_xmit_nit(), input packets are processed by net_bh
   sequencially, so that if we return skb to original state on exit,
   we will not harm anyone.
 */

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static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
		      struct packet_type *pt, struct net_device *orig_dev)
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{
	struct sock *sk;
	struct sockaddr_ll *sll;
	struct packet_sock *po;
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	u8 *skb_head = skb->data;
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	int skb_len = skb->len;
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	unsigned int snaplen, res;
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	if (skb->pkt_type == PACKET_LOOPBACK)
		goto drop;

	sk = pt->af_packet_priv;
	po = pkt_sk(sk);

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	if (!net_eq(dev_net(dev), sock_net(sk)))
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		goto drop;

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	skb->dev = dev;

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	if (dev->header_ops) {
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		/* The device has an explicit notion of ll header,
		   exported to higher levels.

		   Otherwise, the device hides datails of it frame
		   structure, so that corresponding packet head
		   never delivered to user.
		 */
		if (sk->sk_type != SOCK_DGRAM)
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			skb_push(skb, skb->data - skb_mac_header(skb));
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		else if (skb->pkt_type == PACKET_OUTGOING) {
			/* Special case: outgoing packets have ll header at head */
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			skb_pull(skb, skb_network_offset(skb));
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		}
	}

	snaplen = skb->len;

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David S. Miller 已提交
562 563
	res = run_filter(skb, sk, snaplen);
	if (!res)
564
		goto drop_n_restore;
D
David S. Miller 已提交
565 566
	if (snaplen > res)
		snaplen = res;
L
Linus Torvalds 已提交
567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584

	if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
	    (unsigned)sk->sk_rcvbuf)
		goto drop_n_acct;

	if (skb_shared(skb)) {
		struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
		if (nskb == NULL)
			goto drop_n_acct;

		if (skb_head != skb->data) {
			skb->data = skb_head;
			skb->len = skb_len;
		}
		kfree_skb(skb);
		skb = nskb;
	}

585 586 587 588
	BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 >
		     sizeof(skb->cb));

	sll = &PACKET_SKB_CB(skb)->sa.ll;
L
Linus Torvalds 已提交
589 590 591 592
	sll->sll_family = AF_PACKET;
	sll->sll_hatype = dev->type;
	sll->sll_protocol = skb->protocol;
	sll->sll_pkttype = skb->pkt_type;
593
	if (unlikely(po->origdev))
594 595 596
		sll->sll_ifindex = orig_dev->ifindex;
	else
		sll->sll_ifindex = dev->ifindex;
L
Linus Torvalds 已提交
597

S
Stephen Hemminger 已提交
598
	sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
L
Linus Torvalds 已提交
599

600
	PACKET_SKB_CB(skb)->origlen = skb->len;
601

L
Linus Torvalds 已提交
602 603 604 605 606
	if (pskb_trim(skb, snaplen))
		goto drop_n_acct;

	skb_set_owner_r(skb, sk);
	skb->dev = NULL;
E
Eric Dumazet 已提交
607
	skb_dst_drop(skb);
L
Linus Torvalds 已提交
608

609 610 611
	/* drop conntrack reference */
	nf_reset(skb);

L
Linus Torvalds 已提交
612 613
	spin_lock(&sk->sk_receive_queue.lock);
	po->stats.tp_packets++;
614
	skb->dropcount = atomic_read(&sk->sk_drops);
L
Linus Torvalds 已提交
615 616 617 618 619 620
	__skb_queue_tail(&sk->sk_receive_queue, skb);
	spin_unlock(&sk->sk_receive_queue.lock);
	sk->sk_data_ready(sk, skb->len);
	return 0;

drop_n_acct:
621
	po->stats.tp_drops = atomic_inc_return(&sk->sk_drops);
L
Linus Torvalds 已提交
622 623 624 625 626 627 628

drop_n_restore:
	if (skb_head != skb->data && skb_shared(skb)) {
		skb->data = skb_head;
		skb->len = skb_len;
	}
drop:
629
	consume_skb(skb);
L
Linus Torvalds 已提交
630 631 632
	return 0;
}

E
Eric Dumazet 已提交
633 634
static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
		       struct packet_type *pt, struct net_device *orig_dev)
L
Linus Torvalds 已提交
635 636 637 638
{
	struct sock *sk;
	struct packet_sock *po;
	struct sockaddr_ll *sll;
639 640 641 642 643
	union {
		struct tpacket_hdr *h1;
		struct tpacket2_hdr *h2;
		void *raw;
	} h;
E
Eric Dumazet 已提交
644
	u8 *skb_head = skb->data;
L
Linus Torvalds 已提交
645
	int skb_len = skb->len;
D
David S. Miller 已提交
646
	unsigned int snaplen, res;
L
Linus Torvalds 已提交
647
	unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
648
	unsigned short macoff, netoff, hdrlen;
L
Linus Torvalds 已提交
649
	struct sk_buff *copy_skb = NULL;
650
	struct timeval tv;
651
	struct timespec ts;
L
Linus Torvalds 已提交
652 653 654 655 656 657 658

	if (skb->pkt_type == PACKET_LOOPBACK)
		goto drop;

	sk = pt->af_packet_priv;
	po = pkt_sk(sk);

O
Octavian Purdila 已提交
659
	if (!net_eq(dev_net(dev), sock_net(sk)))
660 661
		goto drop;

662
	if (dev->header_ops) {
L
Linus Torvalds 已提交
663
		if (sk->sk_type != SOCK_DGRAM)
664
			skb_push(skb, skb->data - skb_mac_header(skb));
L
Linus Torvalds 已提交
665 666
		else if (skb->pkt_type == PACKET_OUTGOING) {
			/* Special case: outgoing packets have ll header at head */
667
			skb_pull(skb, skb_network_offset(skb));
L
Linus Torvalds 已提交
668 669 670
		}
	}

671 672 673
	if (skb->ip_summed == CHECKSUM_PARTIAL)
		status |= TP_STATUS_CSUMNOTREADY;

L
Linus Torvalds 已提交
674 675
	snaplen = skb->len;

D
David S. Miller 已提交
676 677
	res = run_filter(skb, sk, snaplen);
	if (!res)
678
		goto drop_n_restore;
D
David S. Miller 已提交
679 680
	if (snaplen > res)
		snaplen = res;
L
Linus Torvalds 已提交
681 682

	if (sk->sk_type == SOCK_DGRAM) {
683 684
		macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
				  po->tp_reserve;
L
Linus Torvalds 已提交
685
	} else {
686
		unsigned maclen = skb_network_offset(skb);
687
		netoff = TPACKET_ALIGN(po->tp_hdrlen +
688 689
				       (maclen < 16 ? 16 : maclen)) +
			po->tp_reserve;
L
Linus Torvalds 已提交
690 691 692
		macoff = netoff - maclen;
	}

J
Johann Baudy 已提交
693
	if (macoff + snaplen > po->rx_ring.frame_size) {
L
Linus Torvalds 已提交
694 695 696 697 698 699 700 701 702 703 704 705
		if (po->copy_thresh &&
		    atomic_read(&sk->sk_rmem_alloc) + skb->truesize <
		    (unsigned)sk->sk_rcvbuf) {
			if (skb_shared(skb)) {
				copy_skb = skb_clone(skb, GFP_ATOMIC);
			} else {
				copy_skb = skb_get(skb);
				skb_head = skb->data;
			}
			if (copy_skb)
				skb_set_owner_r(copy_skb, sk);
		}
J
Johann Baudy 已提交
706
		snaplen = po->rx_ring.frame_size - macoff;
L
Linus Torvalds 已提交
707 708 709 710 711
		if ((int)snaplen < 0)
			snaplen = 0;
	}

	spin_lock(&sk->sk_receive_queue.lock);
J
Johann Baudy 已提交
712
	h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL);
713
	if (!h.raw)
L
Linus Torvalds 已提交
714
		goto ring_is_full;
J
Johann Baudy 已提交
715
	packet_increment_head(&po->rx_ring);
L
Linus Torvalds 已提交
716 717 718 719 720 721 722 723 724
	po->stats.tp_packets++;
	if (copy_skb) {
		status |= TP_STATUS_COPY;
		__skb_queue_tail(&sk->sk_receive_queue, copy_skb);
	}
	if (!po->stats.tp_drops)
		status &= ~TP_STATUS_LOSING;
	spin_unlock(&sk->sk_receive_queue.lock);

725
	skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
L
Linus Torvalds 已提交
726

727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751
	switch (po->tp_version) {
	case TPACKET_V1:
		h.h1->tp_len = skb->len;
		h.h1->tp_snaplen = snaplen;
		h.h1->tp_mac = macoff;
		h.h1->tp_net = netoff;
		if (skb->tstamp.tv64)
			tv = ktime_to_timeval(skb->tstamp);
		else
			do_gettimeofday(&tv);
		h.h1->tp_sec = tv.tv_sec;
		h.h1->tp_usec = tv.tv_usec;
		hdrlen = sizeof(*h.h1);
		break;
	case TPACKET_V2:
		h.h2->tp_len = skb->len;
		h.h2->tp_snaplen = snaplen;
		h.h2->tp_mac = macoff;
		h.h2->tp_net = netoff;
		if (skb->tstamp.tv64)
			ts = ktime_to_timespec(skb->tstamp);
		else
			getnstimeofday(&ts);
		h.h2->tp_sec = ts.tv_sec;
		h.h2->tp_nsec = ts.tv_nsec;
E
Eric Dumazet 已提交
752
		h.h2->tp_vlan_tci = vlan_tx_tag_get(skb);
753 754 755 756 757
		hdrlen = sizeof(*h.h2);
		break;
	default:
		BUG();
	}
L
Linus Torvalds 已提交
758

759
	sll = h.raw + TPACKET_ALIGN(hdrlen);
S
Stephen Hemminger 已提交
760
	sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
L
Linus Torvalds 已提交
761 762 763 764
	sll->sll_family = AF_PACKET;
	sll->sll_hatype = dev->type;
	sll->sll_protocol = skb->protocol;
	sll->sll_pkttype = skb->pkt_type;
765
	if (unlikely(po->origdev))
766 767 768
		sll->sll_ifindex = orig_dev->ifindex;
	else
		sll->sll_ifindex = dev->ifindex;
L
Linus Torvalds 已提交
769

770
	__packet_set_status(po, h.raw, status);
R
Ralf Baechle 已提交
771
	smp_mb();
L
Linus Torvalds 已提交
772 773
	{
		struct page *p_start, *p_end;
774
		u8 *h_end = h.raw + macoff + snaplen - 1;
L
Linus Torvalds 已提交
775

776
		p_start = virt_to_page(h.raw);
L
Linus Torvalds 已提交
777 778 779 780 781 782 783 784 785 786 787 788 789 790 791
		p_end = virt_to_page(h_end);
		while (p_start <= p_end) {
			flush_dcache_page(p_start);
			p_start++;
		}
	}

	sk->sk_data_ready(sk, 0);

drop_n_restore:
	if (skb_head != skb->data && skb_shared(skb)) {
		skb->data = skb_head;
		skb->len = skb_len;
	}
drop:
792
	kfree_skb(skb);
L
Linus Torvalds 已提交
793 794 795 796 797 798 799
	return 0;

ring_is_full:
	po->stats.tp_drops++;
	spin_unlock(&sk->sk_receive_queue.lock);

	sk->sk_data_ready(sk, 0);
800
	kfree_skb(copy_skb);
L
Linus Torvalds 已提交
801 802 803
	goto drop_n_restore;
}

J
Johann Baudy 已提交
804 805 806
static void tpacket_destruct_skb(struct sk_buff *skb)
{
	struct packet_sock *po = pkt_sk(skb->sk);
E
Eric Dumazet 已提交
807
	void *ph;
L
Linus Torvalds 已提交
808

J
Johann Baudy 已提交
809
	BUG_ON(skb == NULL);
L
Linus Torvalds 已提交
810

J
Johann Baudy 已提交
811 812 813 814 815 816 817 818 819 820 821
	if (likely(po->tx_ring.pg_vec)) {
		ph = skb_shinfo(skb)->destructor_arg;
		BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING);
		BUG_ON(atomic_read(&po->tx_ring.pending) == 0);
		atomic_dec(&po->tx_ring.pending);
		__packet_set_status(po, ph, TP_STATUS_AVAILABLE);
	}

	sock_wfree(skb);
}

E
Eric Dumazet 已提交
822 823 824
static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
		void *frame, struct net_device *dev, int size_max,
		__be16 proto, unsigned char *addr)
J
Johann Baudy 已提交
825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841
{
	union {
		struct tpacket_hdr *h1;
		struct tpacket2_hdr *h2;
		void *raw;
	} ph;
	int to_write, offset, len, tp_len, nr_frags, len_max;
	struct socket *sock = po->sk.sk_socket;
	struct page *page;
	void *data;
	int err;

	ph.raw = frame;

	skb->protocol = proto;
	skb->dev = dev;
	skb->priority = po->sk.sk_priority;
842
	skb->mark = po->sk.sk_mark;
J
Johann Baudy 已提交
843 844 845 846 847 848 849 850 851 852 853
	skb_shinfo(skb)->destructor_arg = ph.raw;

	switch (po->tp_version) {
	case TPACKET_V2:
		tp_len = ph.h2->tp_len;
		break;
	default:
		tp_len = ph.h1->tp_len;
		break;
	}
	if (unlikely(tp_len > size_max)) {
E
Eric Dumazet 已提交
854
		pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
J
Johann Baudy 已提交
855 856 857 858 859 860 861 862 863 864 865 866 867 868
		return -EMSGSIZE;
	}

	skb_reserve(skb, LL_RESERVED_SPACE(dev));
	skb_reset_network_header(skb);

	data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll);
	to_write = tp_len;

	if (sock->type == SOCK_DGRAM) {
		err = dev_hard_header(skb, dev, ntohs(proto), addr,
				NULL, tp_len);
		if (unlikely(err < 0))
			return -EINVAL;
E
Eric Dumazet 已提交
869
	} else if (dev->hard_header_len) {
J
Johann Baudy 已提交
870 871
		/* net device doesn't like empty head */
		if (unlikely(tp_len <= dev->hard_header_len)) {
E
Eric Dumazet 已提交
872 873
			pr_err("packet size is too short (%d < %d)\n",
			       tp_len, dev->hard_header_len);
J
Johann Baudy 已提交
874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901
			return -EINVAL;
		}

		skb_push(skb, dev->hard_header_len);
		err = skb_store_bits(skb, 0, data,
				dev->hard_header_len);
		if (unlikely(err))
			return err;

		data += dev->hard_header_len;
		to_write -= dev->hard_header_len;
	}

	err = -EFAULT;
	page = virt_to_page(data);
	offset = offset_in_page(data);
	len_max = PAGE_SIZE - offset;
	len = ((to_write > len_max) ? len_max : to_write);

	skb->data_len = to_write;
	skb->len += to_write;
	skb->truesize += to_write;
	atomic_add(to_write, &po->sk.sk_wmem_alloc);

	while (likely(to_write)) {
		nr_frags = skb_shinfo(skb)->nr_frags;

		if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
E
Eric Dumazet 已提交
902 903
			pr_err("Packet exceed the number of skb frags(%lu)\n",
			       MAX_SKB_FRAGS);
J
Johann Baudy 已提交
904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927
			return -EFAULT;
		}

		flush_dcache_page(page);
		get_page(page);
		skb_fill_page_desc(skb,
				nr_frags,
				page++, offset, len);
		to_write -= len;
		offset = 0;
		len_max = PAGE_SIZE;
		len = ((to_write > len_max) ? len_max : to_write);
	}

	return tp_len;
}

static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
{
	struct socket *sock;
	struct sk_buff *skb;
	struct net_device *dev;
	__be16 proto;
	int ifindex, err, reserve = 0;
E
Eric Dumazet 已提交
928 929
	void *ph;
	struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
J
Johann Baudy 已提交
930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968
	int tp_len, size_max;
	unsigned char *addr;
	int len_sum = 0;
	int status = 0;

	sock = po->sk.sk_socket;

	mutex_lock(&po->pg_vec_lock);

	err = -EBUSY;
	if (saddr == NULL) {
		ifindex	= po->ifindex;
		proto	= po->num;
		addr	= NULL;
	} else {
		err = -EINVAL;
		if (msg->msg_namelen < sizeof(struct sockaddr_ll))
			goto out;
		if (msg->msg_namelen < (saddr->sll_halen
					+ offsetof(struct sockaddr_ll,
						sll_addr)))
			goto out;
		ifindex	= saddr->sll_ifindex;
		proto	= saddr->sll_protocol;
		addr	= saddr->sll_addr;
	}

	dev = dev_get_by_index(sock_net(&po->sk), ifindex);
	err = -ENXIO;
	if (unlikely(dev == NULL))
		goto out;

	reserve = dev->hard_header_len;

	err = -ENETDOWN;
	if (unlikely(!(dev->flags & IFF_UP)))
		goto out_put;

	size_max = po->tx_ring.frame_size
969
		- (po->tp_hdrlen - sizeof(struct sockaddr_ll));
J
Johann Baudy 已提交
970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014

	if (size_max > dev->mtu + reserve)
		size_max = dev->mtu + reserve;

	do {
		ph = packet_current_frame(po, &po->tx_ring,
				TP_STATUS_SEND_REQUEST);

		if (unlikely(ph == NULL)) {
			schedule();
			continue;
		}

		status = TP_STATUS_SEND_REQUEST;
		skb = sock_alloc_send_skb(&po->sk,
				LL_ALLOCATED_SPACE(dev)
				+ sizeof(struct sockaddr_ll),
				0, &err);

		if (unlikely(skb == NULL))
			goto out_status;

		tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto,
				addr);

		if (unlikely(tp_len < 0)) {
			if (po->tp_loss) {
				__packet_set_status(po, ph,
						TP_STATUS_AVAILABLE);
				packet_increment_head(&po->tx_ring);
				kfree_skb(skb);
				continue;
			} else {
				status = TP_STATUS_WRONG_FORMAT;
				err = tp_len;
				goto out_status;
			}
		}

		skb->destructor = tpacket_destruct_skb;
		__packet_set_status(po, ph, TP_STATUS_SENDING);
		atomic_inc(&po->tx_ring.pending);

		status = TP_STATUS_SEND_REQUEST;
		err = dev_queue_xmit(skb);
1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028
		if (unlikely(err > 0)) {
			err = net_xmit_errno(err);
			if (err && __packet_get_status(po, ph) ==
				   TP_STATUS_AVAILABLE) {
				/* skb was destructed already */
				skb = NULL;
				goto out_status;
			}
			/*
			 * skb was dropped but not destructed yet;
			 * let's treat it like congestion or err < 0
			 */
			err = 0;
		}
J
Johann Baudy 已提交
1029 1030
		packet_increment_head(&po->tx_ring);
		len_sum += tp_len;
1031 1032 1033 1034
	} while (likely((ph != NULL) ||
			((!(msg->msg_flags & MSG_DONTWAIT)) &&
			 (atomic_read(&po->tx_ring.pending))))
		);
J
Johann Baudy 已提交
1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048

	err = len_sum;
	goto out_put;

out_status:
	__packet_set_status(po, ph, status);
	kfree_skb(skb);
out_put:
	dev_put(dev);
out:
	mutex_unlock(&po->pg_vec_lock);
	return err;
}

1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072
static inline struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
					       size_t reserve, size_t len,
					       size_t linear, int noblock,
					       int *err)
{
	struct sk_buff *skb;

	/* Under a page?  Don't bother with paged skb. */
	if (prepad + len < PAGE_SIZE || !linear)
		linear = len;

	skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
				   err);
	if (!skb)
		return NULL;

	skb_reserve(skb, reserve);
	skb_put(skb, linear);
	skb->data_len = len - linear;
	skb->len += len - linear;

	return skb;
}

J
Johann Baudy 已提交
1073
static int packet_snd(struct socket *sock,
L
Linus Torvalds 已提交
1074 1075 1076
			  struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
E
Eric Dumazet 已提交
1077
	struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
L
Linus Torvalds 已提交
1078 1079
	struct sk_buff *skb;
	struct net_device *dev;
A
Al Viro 已提交
1080
	__be16 proto;
L
Linus Torvalds 已提交
1081 1082
	unsigned char *addr;
	int ifindex, err, reserve = 0;
1083 1084 1085 1086 1087
	struct virtio_net_hdr vnet_hdr = { 0 };
	int offset = 0;
	int vnet_hdr_len;
	struct packet_sock *po = pkt_sk(sk);
	unsigned short gso_type = 0;
L
Linus Torvalds 已提交
1088 1089

	/*
1090
	 *	Get and verify the address.
L
Linus Torvalds 已提交
1091
	 */
1092

L
Linus Torvalds 已提交
1093 1094 1095 1096 1097 1098 1099 1100
	if (saddr == NULL) {
		ifindex	= po->ifindex;
		proto	= po->num;
		addr	= NULL;
	} else {
		err = -EINVAL;
		if (msg->msg_namelen < sizeof(struct sockaddr_ll))
			goto out;
1101 1102
		if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
			goto out;
L
Linus Torvalds 已提交
1103 1104 1105 1106 1107 1108
		ifindex	= saddr->sll_ifindex;
		proto	= saddr->sll_protocol;
		addr	= saddr->sll_addr;
	}


1109
	dev = dev_get_by_index(sock_net(sk), ifindex);
L
Linus Torvalds 已提交
1110 1111 1112 1113 1114 1115
	err = -ENXIO;
	if (dev == NULL)
		goto out_unlock;
	if (sock->type == SOCK_RAW)
		reserve = dev->hard_header_len;

1116 1117 1118 1119
	err = -ENETDOWN;
	if (!(dev->flags & IFF_UP))
		goto out_unlock;

1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167
	if (po->has_vnet_hdr) {
		vnet_hdr_len = sizeof(vnet_hdr);

		err = -EINVAL;
		if (len < vnet_hdr_len)
			goto out_unlock;

		len -= vnet_hdr_len;

		err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov,
				       vnet_hdr_len);
		if (err < 0)
			goto out_unlock;

		if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
		    (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 >
		      vnet_hdr.hdr_len))
			vnet_hdr.hdr_len = vnet_hdr.csum_start +
						 vnet_hdr.csum_offset + 2;

		err = -EINVAL;
		if (vnet_hdr.hdr_len > len)
			goto out_unlock;

		if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
			switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
			case VIRTIO_NET_HDR_GSO_TCPV4:
				gso_type = SKB_GSO_TCPV4;
				break;
			case VIRTIO_NET_HDR_GSO_TCPV6:
				gso_type = SKB_GSO_TCPV6;
				break;
			case VIRTIO_NET_HDR_GSO_UDP:
				gso_type = SKB_GSO_UDP;
				break;
			default:
				goto out_unlock;
			}

			if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
				gso_type |= SKB_GSO_TCP_ECN;

			if (vnet_hdr.gso_size == 0)
				goto out_unlock;

		}
	}

L
Linus Torvalds 已提交
1168
	err = -EMSGSIZE;
1169
	if (!gso_type && (len > dev->mtu+reserve))
L
Linus Torvalds 已提交
1170 1171
		goto out_unlock;

1172 1173 1174 1175
	err = -ENOBUFS;
	skb = packet_alloc_skb(sk, LL_ALLOCATED_SPACE(dev),
			       LL_RESERVED_SPACE(dev), len, vnet_hdr.hdr_len,
			       msg->msg_flags & MSG_DONTWAIT, &err);
E
Eric Dumazet 已提交
1176
	if (skb == NULL)
L
Linus Torvalds 已提交
1177 1178
		goto out_unlock;

1179
	skb_set_network_header(skb, reserve);
L
Linus Torvalds 已提交
1180

1181 1182
	err = -EINVAL;
	if (sock->type == SOCK_DGRAM &&
1183
	    (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0)
1184
		goto out_free;
L
Linus Torvalds 已提交
1185 1186

	/* Returns -EFAULT on error */
1187
	err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len);
L
Linus Torvalds 已提交
1188 1189 1190 1191 1192 1193
	if (err)
		goto out_free;

	skb->protocol = proto;
	skb->dev = dev;
	skb->priority = sk->sk_priority;
1194
	skb->mark = sk->sk_mark;
L
Linus Torvalds 已提交
1195

1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214
	if (po->has_vnet_hdr) {
		if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
			if (!skb_partial_csum_set(skb, vnet_hdr.csum_start,
						  vnet_hdr.csum_offset)) {
				err = -EINVAL;
				goto out_free;
			}
		}

		skb_shinfo(skb)->gso_size = vnet_hdr.gso_size;
		skb_shinfo(skb)->gso_type = gso_type;

		/* Header must be checked, and gso_segs computed. */
		skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
		skb_shinfo(skb)->gso_segs = 0;

		len += vnet_hdr_len;
	}

L
Linus Torvalds 已提交
1215 1216 1217 1218 1219 1220 1221 1222 1223 1224
	/*
	 *	Now send it
	 */

	err = dev_queue_xmit(skb);
	if (err > 0 && (err = net_xmit_errno(err)) != 0)
		goto out_unlock;

	dev_put(dev);

E
Eric Dumazet 已提交
1225
	return len;
L
Linus Torvalds 已提交
1226 1227 1228 1229 1230 1231 1232 1233 1234 1235

out_free:
	kfree_skb(skb);
out_unlock:
	if (dev)
		dev_put(dev);
out:
	return err;
}

J
Johann Baudy 已提交
1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246
static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
		struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
	struct packet_sock *po = pkt_sk(sk);
	if (po->tx_ring.pg_vec)
		return tpacket_snd(po, msg);
	else
		return packet_snd(sock, msg, len);
}

L
Linus Torvalds 已提交
1247 1248 1249 1250 1251 1252 1253 1254 1255
/*
 *	Close a PACKET socket. This is fairly simple. We immediately go
 *	to 'closed' state and remove our protocol entry in the device list.
 */

static int packet_release(struct socket *sock)
{
	struct sock *sk = sock->sk;
	struct packet_sock *po;
1256
	struct net *net;
J
Johann Baudy 已提交
1257
	struct tpacket_req req;
L
Linus Torvalds 已提交
1258 1259 1260 1261

	if (!sk)
		return 0;

1262
	net = sock_net(sk);
L
Linus Torvalds 已提交
1263 1264
	po = pkt_sk(sk);

1265 1266
	spin_lock_bh(&net->packet.sklist_lock);
	sk_del_node_init_rcu(sk);
1267
	sock_prot_inuse_add(net, sk->sk_prot, -1);
1268
	spin_unlock_bh(&net->packet.sklist_lock);
L
Linus Torvalds 已提交
1269

1270
	spin_lock(&po->bind_lock);
L
Linus Torvalds 已提交
1271 1272
	if (po->running) {
		/*
1273
		 * Remove from protocol table
L
Linus Torvalds 已提交
1274 1275 1276
		 */
		po->running = 0;
		po->num = 0;
1277
		__dev_remove_pack(&po->prot_hook);
L
Linus Torvalds 已提交
1278 1279
		__sock_put(sk);
	}
1280
	spin_unlock(&po->bind_lock);
L
Linus Torvalds 已提交
1281 1282 1283

	packet_flush_mclist(sk);

J
Johann Baudy 已提交
1284 1285 1286 1287 1288 1289 1290
	memset(&req, 0, sizeof(req));

	if (po->rx_ring.pg_vec)
		packet_set_ring(sk, &req, 1, 0);

	if (po->tx_ring.pg_vec)
		packet_set_ring(sk, &req, 1, 1);
L
Linus Torvalds 已提交
1291

1292
	synchronize_net();
L
Linus Torvalds 已提交
1293 1294 1295 1296 1297 1298 1299 1300 1301
	/*
	 *	Now the socket is dead. No more input will appear.
	 */
	sock_orphan(sk);
	sock->sk = NULL;

	/* Purge queues */

	skb_queue_purge(&sk->sk_receive_queue);
1302
	sk_refcnt_debug_release(sk);
L
Linus Torvalds 已提交
1303 1304 1305 1306 1307 1308 1309 1310 1311

	sock_put(sk);
	return 0;
}

/*
 *	Attach a packet hook.
 */

A
Al Viro 已提交
1312
static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
L
Linus Torvalds 已提交
1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339
{
	struct packet_sock *po = pkt_sk(sk);
	/*
	 *	Detach an existing hook if present.
	 */

	lock_sock(sk);

	spin_lock(&po->bind_lock);
	if (po->running) {
		__sock_put(sk);
		po->running = 0;
		po->num = 0;
		spin_unlock(&po->bind_lock);
		dev_remove_pack(&po->prot_hook);
		spin_lock(&po->bind_lock);
	}

	po->num = protocol;
	po->prot_hook.type = protocol;
	po->prot_hook.dev = dev;

	po->ifindex = dev ? dev->ifindex : 0;

	if (protocol == 0)
		goto out_unlock;

1340
	if (!dev || (dev->flags & IFF_UP)) {
L
Linus Torvalds 已提交
1341 1342 1343
		dev_add_pack(&po->prot_hook);
		sock_hold(sk);
		po->running = 1;
1344 1345 1346 1347
	} else {
		sk->sk_err = ENETDOWN;
		if (!sock_flag(sk, SOCK_DEAD))
			sk->sk_error_report(sk);
L
Linus Torvalds 已提交
1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359
	}

out_unlock:
	spin_unlock(&po->bind_lock);
	release_sock(sk);
	return 0;
}

/*
 *	Bind a packet socket to a device
 */

E
Eric Dumazet 已提交
1360 1361
static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
			    int addr_len)
L
Linus Torvalds 已提交
1362
{
E
Eric Dumazet 已提交
1363
	struct sock *sk = sock->sk;
L
Linus Torvalds 已提交
1364 1365 1366
	char name[15];
	struct net_device *dev;
	int err = -ENODEV;
1367

L
Linus Torvalds 已提交
1368 1369 1370
	/*
	 *	Check legality
	 */
1371

1372
	if (addr_len != sizeof(struct sockaddr))
L
Linus Torvalds 已提交
1373
		return -EINVAL;
E
Eric Dumazet 已提交
1374
	strlcpy(name, uaddr->sa_data, sizeof(name));
L
Linus Torvalds 已提交
1375

1376
	dev = dev_get_by_name(sock_net(sk), name);
L
Linus Torvalds 已提交
1377 1378 1379 1380 1381 1382 1383 1384 1385
	if (dev) {
		err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
		dev_put(dev);
	}
	return err;
}

static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
E
Eric Dumazet 已提交
1386 1387
	struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
	struct sock *sk = sock->sk;
L
Linus Torvalds 已提交
1388 1389 1390 1391 1392 1393 1394
	struct net_device *dev = NULL;
	int err;


	/*
	 *	Check legality
	 */
1395

L
Linus Torvalds 已提交
1396 1397 1398 1399 1400 1401 1402
	if (addr_len < sizeof(struct sockaddr_ll))
		return -EINVAL;
	if (sll->sll_family != AF_PACKET)
		return -EINVAL;

	if (sll->sll_ifindex) {
		err = -ENODEV;
1403
		dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
L
Linus Torvalds 已提交
1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421
		if (dev == NULL)
			goto out;
	}
	err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
	if (dev)
		dev_put(dev);

out:
	return err;
}

static struct proto packet_proto = {
	.name	  = "PACKET",
	.owner	  = THIS_MODULE,
	.obj_size = sizeof(struct packet_sock),
};

/*
1422
 *	Create a packet of type SOCK_PACKET.
L
Linus Torvalds 已提交
1423 1424
 */

1425 1426
static int packet_create(struct net *net, struct socket *sock, int protocol,
			 int kern)
L
Linus Torvalds 已提交
1427 1428 1429
{
	struct sock *sk;
	struct packet_sock *po;
A
Al Viro 已提交
1430
	__be16 proto = (__force __be16)protocol; /* weird, but documented */
L
Linus Torvalds 已提交
1431 1432 1433 1434
	int err;

	if (!capable(CAP_NET_RAW))
		return -EPERM;
1435 1436
	if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
	    sock->type != SOCK_PACKET)
L
Linus Torvalds 已提交
1437 1438 1439 1440 1441
		return -ESOCKTNOSUPPORT;

	sock->state = SS_UNCONNECTED;

	err = -ENOBUFS;
1442
	sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
L
Linus Torvalds 已提交
1443 1444 1445 1446 1447 1448
	if (sk == NULL)
		goto out;

	sock->ops = &packet_ops;
	if (sock->type == SOCK_PACKET)
		sock->ops = &packet_ops_spkt;
1449

L
Linus Torvalds 已提交
1450 1451 1452 1453
	sock_init_data(sock, sk);

	po = pkt_sk(sk);
	sk->sk_family = PF_PACKET;
A
Al Viro 已提交
1454
	po->num = proto;
L
Linus Torvalds 已提交
1455 1456

	sk->sk_destruct = packet_sock_destruct;
1457
	sk_refcnt_debug_inc(sk);
L
Linus Torvalds 已提交
1458 1459 1460 1461 1462 1463

	/*
	 *	Attach a protocol block
	 */

	spin_lock_init(&po->bind_lock);
1464
	mutex_init(&po->pg_vec_lock);
L
Linus Torvalds 已提交
1465
	po->prot_hook.func = packet_rcv;
1466

L
Linus Torvalds 已提交
1467 1468
	if (sock->type == SOCK_PACKET)
		po->prot_hook.func = packet_rcv_spkt;
1469

L
Linus Torvalds 已提交
1470 1471
	po->prot_hook.af_packet_priv = sk;

A
Al Viro 已提交
1472 1473
	if (proto) {
		po->prot_hook.type = proto;
L
Linus Torvalds 已提交
1474 1475 1476 1477 1478
		dev_add_pack(&po->prot_hook);
		sock_hold(sk);
		po->running = 1;
	}

1479 1480
	spin_lock_bh(&net->packet.sklist_lock);
	sk_add_node_rcu(sk, &net->packet.sklist);
1481
	sock_prot_inuse_add(net, &packet_proto, 1);
1482 1483
	spin_unlock_bh(&net->packet.sklist_lock);

E
Eric Dumazet 已提交
1484
	return 0;
L
Linus Torvalds 已提交
1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499
out:
	return err;
}

/*
 *	Pull a packet from our receive queue and hand it to the user.
 *	If necessary we block.
 */

static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
			  struct msghdr *msg, size_t len, int flags)
{
	struct sock *sk = sock->sk;
	struct sk_buff *skb;
	int copied, err;
1500
	struct sockaddr_ll *sll;
1501
	int vnet_hdr_len = 0;
L
Linus Torvalds 已提交
1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521

	err = -EINVAL;
	if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
		goto out;

#if 0
	/* What error should we return now? EUNATTACH? */
	if (pkt_sk(sk)->ifindex < 0)
		return -ENODEV;
#endif

	/*
	 *	Call the generic datagram receiver. This handles all sorts
	 *	of horrible races and re-entrancy so we can forget about it
	 *	in the protocol layers.
	 *
	 *	Now it will return ENETDOWN, if device have just gone down,
	 *	but then it will block.
	 */

E
Eric Dumazet 已提交
1522
	skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
L
Linus Torvalds 已提交
1523 1524

	/*
1525
	 *	An error occurred so return it. Because skb_recv_datagram()
L
Linus Torvalds 已提交
1526 1527 1528 1529
	 *	handles the blocking we don't see and worry about blocking
	 *	retries.
	 */

1530
	if (skb == NULL)
L
Linus Torvalds 已提交
1531 1532
		goto out;

1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574
	if (pkt_sk(sk)->has_vnet_hdr) {
		struct virtio_net_hdr vnet_hdr = { 0 };

		err = -EINVAL;
		vnet_hdr_len = sizeof(vnet_hdr);
		if ((len -= vnet_hdr_len) < 0)
			goto out_free;

		if (skb_is_gso(skb)) {
			struct skb_shared_info *sinfo = skb_shinfo(skb);

			/* This is a hint as to how much should be linear. */
			vnet_hdr.hdr_len = skb_headlen(skb);
			vnet_hdr.gso_size = sinfo->gso_size;
			if (sinfo->gso_type & SKB_GSO_TCPV4)
				vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
			else if (sinfo->gso_type & SKB_GSO_TCPV6)
				vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
			else if (sinfo->gso_type & SKB_GSO_UDP)
				vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
			else if (sinfo->gso_type & SKB_GSO_FCOE)
				goto out_free;
			else
				BUG();
			if (sinfo->gso_type & SKB_GSO_TCP_ECN)
				vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
		} else
			vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;

		if (skb->ip_summed == CHECKSUM_PARTIAL) {
			vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
			vnet_hdr.csum_start = skb->csum_start -
							skb_headroom(skb);
			vnet_hdr.csum_offset = skb->csum_offset;
		} /* else everything is zero */

		err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr,
				     vnet_hdr_len);
		if (err < 0)
			goto out_free;
	}

1575 1576 1577 1578 1579
	/*
	 *	If the address length field is there to be filled in, we fill
	 *	it in now.
	 */

1580
	sll = &PACKET_SKB_CB(skb)->sa.ll;
1581 1582 1583 1584 1585
	if (sock->type == SOCK_PACKET)
		msg->msg_namelen = sizeof(struct sockaddr_pkt);
	else
		msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr);

L
Linus Torvalds 已提交
1586 1587 1588 1589 1590 1591
	/*
	 *	You lose any data beyond the buffer you gave. If it worries a
	 *	user program they can ask the device for its MTU anyway.
	 */

	copied = skb->len;
E
Eric Dumazet 已提交
1592 1593 1594
	if (copied > len) {
		copied = len;
		msg->msg_flags |= MSG_TRUNC;
L
Linus Torvalds 已提交
1595 1596 1597 1598 1599 1600
	}

	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
	if (err)
		goto out_free;

1601
	sock_recv_ts_and_drops(msg, sk, skb);
L
Linus Torvalds 已提交
1602 1603

	if (msg->msg_name)
1604 1605
		memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
		       msg->msg_namelen);
L
Linus Torvalds 已提交
1606

1607
	if (pkt_sk(sk)->auxdata) {
1608 1609 1610 1611 1612 1613 1614 1615
		struct tpacket_auxdata aux;

		aux.tp_status = TP_STATUS_USER;
		if (skb->ip_summed == CHECKSUM_PARTIAL)
			aux.tp_status |= TP_STATUS_CSUMNOTREADY;
		aux.tp_len = PACKET_SKB_CB(skb)->origlen;
		aux.tp_snaplen = skb->len;
		aux.tp_mac = 0;
1616
		aux.tp_net = skb_network_offset(skb);
E
Eric Dumazet 已提交
1617
		aux.tp_vlan_tci = vlan_tx_tag_get(skb);
1618 1619

		put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
1620 1621
	}

L
Linus Torvalds 已提交
1622 1623 1624 1625
	/*
	 *	Free or return the buffer as appropriate. Again this
	 *	hides all the races and re-entrancy issues from us.
	 */
1626
	err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
L
Linus Torvalds 已提交
1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643

out_free:
	skb_free_datagram(sk, skb);
out:
	return err;
}

static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
			       int *uaddr_len, int peer)
{
	struct net_device *dev;
	struct sock *sk	= sock->sk;

	if (peer)
		return -EOPNOTSUPP;

	uaddr->sa_family = AF_PACKET;
E
Eric Dumazet 已提交
1644 1645 1646
	rcu_read_lock();
	dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
	if (dev)
L
Linus Torvalds 已提交
1647
		strlcpy(uaddr->sa_data, dev->name, 15);
E
Eric Dumazet 已提交
1648
	else
L
Linus Torvalds 已提交
1649
		memset(uaddr->sa_data, 0, 14);
E
Eric Dumazet 已提交
1650
	rcu_read_unlock();
L
Linus Torvalds 已提交
1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661
	*uaddr_len = sizeof(*uaddr);

	return 0;
}

static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
			  int *uaddr_len, int peer)
{
	struct net_device *dev;
	struct sock *sk = sock->sk;
	struct packet_sock *po = pkt_sk(sk);
1662
	DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
L
Linus Torvalds 已提交
1663 1664 1665 1666 1667 1668 1669

	if (peer)
		return -EOPNOTSUPP;

	sll->sll_family = AF_PACKET;
	sll->sll_ifindex = po->ifindex;
	sll->sll_protocol = po->num;
E
Eric Dumazet 已提交
1670 1671
	rcu_read_lock();
	dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
L
Linus Torvalds 已提交
1672 1673 1674 1675 1676 1677 1678 1679
	if (dev) {
		sll->sll_hatype = dev->type;
		sll->sll_halen = dev->addr_len;
		memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
	} else {
		sll->sll_hatype = 0;	/* Bad: we have no ARPHRD_UNSPEC */
		sll->sll_halen = 0;
	}
E
Eric Dumazet 已提交
1680
	rcu_read_unlock();
1681
	*uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
L
Linus Torvalds 已提交
1682 1683 1684 1685

	return 0;
}

1686 1687
static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
			 int what)
L
Linus Torvalds 已提交
1688 1689 1690 1691
{
	switch (i->type) {
	case PACKET_MR_MULTICAST:
		if (what > 0)
1692
			return dev_mc_add(dev, i->addr, i->alen, 0);
L
Linus Torvalds 已提交
1693
		else
1694
			return dev_mc_delete(dev, i->addr, i->alen, 0);
L
Linus Torvalds 已提交
1695 1696
		break;
	case PACKET_MR_PROMISC:
1697
		return dev_set_promiscuity(dev, what);
L
Linus Torvalds 已提交
1698 1699
		break;
	case PACKET_MR_ALLMULTI:
1700
		return dev_set_allmulti(dev, what);
L
Linus Torvalds 已提交
1701
		break;
1702 1703
	case PACKET_MR_UNICAST:
		if (what > 0)
J
Jiri Pirko 已提交
1704
			return dev_unicast_add(dev, i->addr);
1705
		else
J
Jiri Pirko 已提交
1706
			return dev_unicast_delete(dev, i->addr);
1707
		break;
E
Eric Dumazet 已提交
1708 1709
	default:
		break;
L
Linus Torvalds 已提交
1710
	}
1711
	return 0;
L
Linus Torvalds 已提交
1712 1713 1714 1715
}

static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
{
E
Eric Dumazet 已提交
1716
	for ( ; i; i = i->next) {
L
Linus Torvalds 已提交
1717 1718 1719 1720 1721
		if (i->ifindex == dev->ifindex)
			packet_dev_mc(dev, i, what);
	}
}

1722
static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
L
Linus Torvalds 已提交
1723 1724 1725 1726 1727 1728 1729 1730 1731
{
	struct packet_sock *po = pkt_sk(sk);
	struct packet_mclist *ml, *i;
	struct net_device *dev;
	int err;

	rtnl_lock();

	err = -ENODEV;
1732
	dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
L
Linus Torvalds 已提交
1733 1734 1735 1736
	if (!dev)
		goto done;

	err = -EINVAL;
1737
	if (mreq->mr_alen != dev->addr_len)
L
Linus Torvalds 已提交
1738 1739 1740
		goto done;

	err = -ENOBUFS;
1741
	i = kmalloc(sizeof(*i), GFP_KERNEL);
L
Linus Torvalds 已提交
1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764
	if (i == NULL)
		goto done;

	err = 0;
	for (ml = po->mclist; ml; ml = ml->next) {
		if (ml->ifindex == mreq->mr_ifindex &&
		    ml->type == mreq->mr_type &&
		    ml->alen == mreq->mr_alen &&
		    memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
			ml->count++;
			/* Free the new element ... */
			kfree(i);
			goto done;
		}
	}

	i->type = mreq->mr_type;
	i->ifindex = mreq->mr_ifindex;
	i->alen = mreq->mr_alen;
	memcpy(i->addr, mreq->mr_address, i->alen);
	i->count = 1;
	i->next = po->mclist;
	po->mclist = i;
1765 1766 1767 1768 1769
	err = packet_dev_mc(dev, i, 1);
	if (err) {
		po->mclist = i->next;
		kfree(i);
	}
L
Linus Torvalds 已提交
1770 1771 1772 1773 1774 1775

done:
	rtnl_unlock();
	return err;
}

1776
static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
L
Linus Torvalds 已提交
1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789
{
	struct packet_mclist *ml, **mlp;

	rtnl_lock();

	for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
		if (ml->ifindex == mreq->mr_ifindex &&
		    ml->type == mreq->mr_type &&
		    ml->alen == mreq->mr_alen &&
		    memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
			if (--ml->count == 0) {
				struct net_device *dev;
				*mlp = ml->next;
1790 1791
				dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
				if (dev)
L
Linus Torvalds 已提交
1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815
					packet_dev_mc(dev, ml, -1);
				kfree(ml);
			}
			rtnl_unlock();
			return 0;
		}
	}
	rtnl_unlock();
	return -EADDRNOTAVAIL;
}

static void packet_flush_mclist(struct sock *sk)
{
	struct packet_sock *po = pkt_sk(sk);
	struct packet_mclist *ml;

	if (!po->mclist)
		return;

	rtnl_lock();
	while ((ml = po->mclist) != NULL) {
		struct net_device *dev;

		po->mclist = ml->next;
1816 1817
		dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
		if (dev != NULL)
L
Linus Torvalds 已提交
1818 1819 1820 1821 1822 1823 1824
			packet_dev_mc(dev, ml, -1);
		kfree(ml);
	}
	rtnl_unlock();
}

static int
1825
packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
L
Linus Torvalds 已提交
1826 1827
{
	struct sock *sk = sock->sk;
1828
	struct packet_sock *po = pkt_sk(sk);
L
Linus Torvalds 已提交
1829 1830 1831 1832 1833
	int ret;

	if (level != SOL_PACKET)
		return -ENOPROTOOPT;

J
Johann Baudy 已提交
1834
	switch (optname) {
1835
	case PACKET_ADD_MEMBERSHIP:
L
Linus Torvalds 已提交
1836 1837
	case PACKET_DROP_MEMBERSHIP:
	{
1838 1839 1840 1841
		struct packet_mreq_max mreq;
		int len = optlen;
		memset(&mreq, 0, sizeof(mreq));
		if (len < sizeof(struct packet_mreq))
L
Linus Torvalds 已提交
1842
			return -EINVAL;
1843 1844
		if (len > sizeof(mreq))
			len = sizeof(mreq);
E
Eric Dumazet 已提交
1845
		if (copy_from_user(&mreq, optval, len))
L
Linus Torvalds 已提交
1846
			return -EFAULT;
1847 1848
		if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
			return -EINVAL;
L
Linus Torvalds 已提交
1849 1850 1851 1852 1853 1854
		if (optname == PACKET_ADD_MEMBERSHIP)
			ret = packet_mc_add(sk, &mreq);
		else
			ret = packet_mc_drop(sk, &mreq);
		return ret;
	}
1855

L
Linus Torvalds 已提交
1856
	case PACKET_RX_RING:
J
Johann Baudy 已提交
1857
	case PACKET_TX_RING:
L
Linus Torvalds 已提交
1858 1859 1860
	{
		struct tpacket_req req;

E
Eric Dumazet 已提交
1861
		if (optlen < sizeof(req))
L
Linus Torvalds 已提交
1862
			return -EINVAL;
1863 1864
		if (pkt_sk(sk)->has_vnet_hdr)
			return -EINVAL;
E
Eric Dumazet 已提交
1865
		if (copy_from_user(&req, optval, sizeof(req)))
L
Linus Torvalds 已提交
1866
			return -EFAULT;
J
Johann Baudy 已提交
1867
		return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING);
L
Linus Torvalds 已提交
1868 1869 1870 1871 1872
	}
	case PACKET_COPY_THRESH:
	{
		int val;

E
Eric Dumazet 已提交
1873
		if (optlen != sizeof(val))
L
Linus Torvalds 已提交
1874
			return -EINVAL;
E
Eric Dumazet 已提交
1875
		if (copy_from_user(&val, optval, sizeof(val)))
L
Linus Torvalds 已提交
1876 1877 1878 1879 1880
			return -EFAULT;

		pkt_sk(sk)->copy_thresh = val;
		return 0;
	}
1881 1882 1883 1884 1885 1886
	case PACKET_VERSION:
	{
		int val;

		if (optlen != sizeof(val))
			return -EINVAL;
J
Johann Baudy 已提交
1887
		if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899
			return -EBUSY;
		if (copy_from_user(&val, optval, sizeof(val)))
			return -EFAULT;
		switch (val) {
		case TPACKET_V1:
		case TPACKET_V2:
			po->tp_version = val;
			return 0;
		default:
			return -EINVAL;
		}
	}
1900 1901 1902 1903 1904 1905
	case PACKET_RESERVE:
	{
		unsigned int val;

		if (optlen != sizeof(val))
			return -EINVAL;
J
Johann Baudy 已提交
1906
		if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1907 1908 1909 1910 1911 1912
			return -EBUSY;
		if (copy_from_user(&val, optval, sizeof(val)))
			return -EFAULT;
		po->tp_reserve = val;
		return 0;
	}
J
Johann Baudy 已提交
1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925
	case PACKET_LOSS:
	{
		unsigned int val;

		if (optlen != sizeof(val))
			return -EINVAL;
		if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
			return -EBUSY;
		if (copy_from_user(&val, optval, sizeof(val)))
			return -EFAULT;
		po->tp_loss = !!val;
		return 0;
	}
1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937
	case PACKET_AUXDATA:
	{
		int val;

		if (optlen < sizeof(val))
			return -EINVAL;
		if (copy_from_user(&val, optval, sizeof(val)))
			return -EFAULT;

		po->auxdata = !!val;
		return 0;
	}
1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949
	case PACKET_ORIGDEV:
	{
		int val;

		if (optlen < sizeof(val))
			return -EINVAL;
		if (copy_from_user(&val, optval, sizeof(val)))
			return -EFAULT;

		po->origdev = !!val;
		return 0;
	}
1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965
	case PACKET_VNET_HDR:
	{
		int val;

		if (sock->type != SOCK_RAW)
			return -EINVAL;
		if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
			return -EBUSY;
		if (optlen < sizeof(val))
			return -EINVAL;
		if (copy_from_user(&val, optval, sizeof(val)))
			return -EFAULT;

		po->has_vnet_hdr = !!val;
		return 0;
	}
L
Linus Torvalds 已提交
1966 1967 1968 1969 1970 1971 1972 1973 1974
	default:
		return -ENOPROTOOPT;
	}
}

static int packet_getsockopt(struct socket *sock, int level, int optname,
			     char __user *optval, int __user *optlen)
{
	int len;
1975
	int val;
L
Linus Torvalds 已提交
1976 1977
	struct sock *sk = sock->sk;
	struct packet_sock *po = pkt_sk(sk);
1978 1979
	void *data;
	struct tpacket_stats st;
L
Linus Torvalds 已提交
1980 1981 1982 1983

	if (level != SOL_PACKET)
		return -ENOPROTOOPT;

1984 1985
	if (get_user(len, optlen))
		return -EFAULT;
L
Linus Torvalds 已提交
1986 1987 1988

	if (len < 0)
		return -EINVAL;
1989

J
Johann Baudy 已提交
1990
	switch (optname) {
L
Linus Torvalds 已提交
1991 1992 1993 1994 1995 1996 1997 1998 1999
	case PACKET_STATISTICS:
		if (len > sizeof(struct tpacket_stats))
			len = sizeof(struct tpacket_stats);
		spin_lock_bh(&sk->sk_receive_queue.lock);
		st = po->stats;
		memset(&po->stats, 0, sizeof(st));
		spin_unlock_bh(&sk->sk_receive_queue.lock);
		st.tp_packets += st.tp_drops;

2000 2001 2002 2003 2004 2005 2006
		data = &st;
		break;
	case PACKET_AUXDATA:
		if (len > sizeof(int))
			len = sizeof(int);
		val = po->auxdata;

2007 2008 2009 2010 2011 2012 2013
		data = &val;
		break;
	case PACKET_ORIGDEV:
		if (len > sizeof(int))
			len = sizeof(int);
		val = po->origdev;

2014 2015 2016 2017 2018 2019 2020
		data = &val;
		break;
	case PACKET_VNET_HDR:
		if (len > sizeof(int))
			len = sizeof(int);
		val = po->has_vnet_hdr;

2021
		data = &val;
L
Linus Torvalds 已提交
2022
		break;
2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045
	case PACKET_VERSION:
		if (len > sizeof(int))
			len = sizeof(int);
		val = po->tp_version;
		data = &val;
		break;
	case PACKET_HDRLEN:
		if (len > sizeof(int))
			len = sizeof(int);
		if (copy_from_user(&val, optval, len))
			return -EFAULT;
		switch (val) {
		case TPACKET_V1:
			val = sizeof(struct tpacket_hdr);
			break;
		case TPACKET_V2:
			val = sizeof(struct tpacket2_hdr);
			break;
		default:
			return -EINVAL;
		}
		data = &val;
		break;
2046 2047 2048 2049 2050 2051
	case PACKET_RESERVE:
		if (len > sizeof(unsigned int))
			len = sizeof(unsigned int);
		val = po->tp_reserve;
		data = &val;
		break;
J
Johann Baudy 已提交
2052 2053 2054 2055 2056 2057
	case PACKET_LOSS:
		if (len > sizeof(unsigned int))
			len = sizeof(unsigned int);
		val = po->tp_loss;
		data = &val;
		break;
L
Linus Torvalds 已提交
2058 2059 2060 2061
	default:
		return -ENOPROTOOPT;
	}

2062 2063
	if (put_user(len, optlen))
		return -EFAULT;
2064 2065
	if (copy_to_user(optval, data, len))
		return -EFAULT;
2066
	return 0;
L
Linus Torvalds 已提交
2067 2068 2069 2070 2071 2072 2073
}


static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
{
	struct sock *sk;
	struct hlist_node *node;
2074
	struct net_device *dev = data;
2075
	struct net *net = dev_net(dev);
L
Linus Torvalds 已提交
2076

2077 2078
	rcu_read_lock();
	sk_for_each_rcu(sk, node, &net->packet.sklist) {
L
Linus Torvalds 已提交
2079 2080 2081 2082 2083 2084
		struct packet_sock *po = pkt_sk(sk);

		switch (msg) {
		case NETDEV_UNREGISTER:
			if (po->mclist)
				packet_dev_mclist(dev, po->mclist, -1);
2085 2086
			/* fallthrough */

L
Linus Torvalds 已提交
2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105
		case NETDEV_DOWN:
			if (dev->ifindex == po->ifindex) {
				spin_lock(&po->bind_lock);
				if (po->running) {
					__dev_remove_pack(&po->prot_hook);
					__sock_put(sk);
					po->running = 0;
					sk->sk_err = ENETDOWN;
					if (!sock_flag(sk, SOCK_DEAD))
						sk->sk_error_report(sk);
				}
				if (msg == NETDEV_UNREGISTER) {
					po->ifindex = -1;
					po->prot_hook.dev = NULL;
				}
				spin_unlock(&po->bind_lock);
			}
			break;
		case NETDEV_UP:
2106 2107 2108 2109 2110 2111 2112 2113
			if (dev->ifindex == po->ifindex) {
				spin_lock(&po->bind_lock);
				if (po->num && !po->running) {
					dev_add_pack(&po->prot_hook);
					sock_hold(sk);
					po->running = 1;
				}
				spin_unlock(&po->bind_lock);
L
Linus Torvalds 已提交
2114 2115 2116 2117
			}
			break;
		}
	}
2118
	rcu_read_unlock();
L
Linus Torvalds 已提交
2119 2120 2121 2122 2123 2124 2125 2126 2127
	return NOTIFY_DONE;
}


static int packet_ioctl(struct socket *sock, unsigned int cmd,
			unsigned long arg)
{
	struct sock *sk = sock->sk;

J
Johann Baudy 已提交
2128
	switch (cmd) {
E
Eric Dumazet 已提交
2129 2130 2131
	case SIOCOUTQ:
	{
		int amount = sk_wmem_alloc_get(sk);
2132

E
Eric Dumazet 已提交
2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150
		return put_user(amount, (int __user *)arg);
	}
	case SIOCINQ:
	{
		struct sk_buff *skb;
		int amount = 0;

		spin_lock_bh(&sk->sk_receive_queue.lock);
		skb = skb_peek(&sk->sk_receive_queue);
		if (skb)
			amount = skb->len;
		spin_unlock_bh(&sk->sk_receive_queue.lock);
		return put_user(amount, (int __user *)arg);
	}
	case SIOCGSTAMP:
		return sock_get_timestamp(sk, (struct timeval __user *)arg);
	case SIOCGSTAMPNS:
		return sock_get_timestampns(sk, (struct timespec __user *)arg);
2151

L
Linus Torvalds 已提交
2152
#ifdef CONFIG_INET
E
Eric Dumazet 已提交
2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169
	case SIOCADDRT:
	case SIOCDELRT:
	case SIOCDARP:
	case SIOCGARP:
	case SIOCSARP:
	case SIOCGIFADDR:
	case SIOCSIFADDR:
	case SIOCGIFBRDADDR:
	case SIOCSIFBRDADDR:
	case SIOCGIFNETMASK:
	case SIOCSIFNETMASK:
	case SIOCGIFDSTADDR:
	case SIOCSIFDSTADDR:
	case SIOCSIFFLAGS:
		if (!net_eq(sock_net(sk), &init_net))
			return -ENOIOCTLCMD;
		return inet_dgram_ops.ioctl(sock, cmd, arg);
L
Linus Torvalds 已提交
2170 2171
#endif

E
Eric Dumazet 已提交
2172 2173
	default:
		return -ENOIOCTLCMD;
L
Linus Torvalds 已提交
2174 2175 2176 2177
	}
	return 0;
}

E
Eric Dumazet 已提交
2178
static unsigned int packet_poll(struct file *file, struct socket *sock,
L
Linus Torvalds 已提交
2179 2180 2181 2182 2183 2184 2185
				poll_table *wait)
{
	struct sock *sk = sock->sk;
	struct packet_sock *po = pkt_sk(sk);
	unsigned int mask = datagram_poll(file, sock, wait);

	spin_lock_bh(&sk->sk_receive_queue.lock);
J
Johann Baudy 已提交
2186 2187
	if (po->rx_ring.pg_vec) {
		if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL))
L
Linus Torvalds 已提交
2188 2189 2190
			mask |= POLLIN | POLLRDNORM;
	}
	spin_unlock_bh(&sk->sk_receive_queue.lock);
J
Johann Baudy 已提交
2191 2192 2193 2194 2195 2196
	spin_lock_bh(&sk->sk_write_queue.lock);
	if (po->tx_ring.pg_vec) {
		if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
			mask |= POLLOUT | POLLWRNORM;
	}
	spin_unlock_bh(&sk->sk_write_queue.lock);
L
Linus Torvalds 已提交
2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207
	return mask;
}


/* Dirty? Well, I still did not learn better way to account
 * for user mmaps.
 */

static void packet_mm_open(struct vm_area_struct *vma)
{
	struct file *file = vma->vm_file;
E
Eric Dumazet 已提交
2208
	struct socket *sock = file->private_data;
L
Linus Torvalds 已提交
2209
	struct sock *sk = sock->sk;
2210

L
Linus Torvalds 已提交
2211 2212 2213 2214 2215 2216 2217
	if (sk)
		atomic_inc(&pkt_sk(sk)->mapped);
}

static void packet_mm_close(struct vm_area_struct *vma)
{
	struct file *file = vma->vm_file;
E
Eric Dumazet 已提交
2218
	struct socket *sock = file->private_data;
L
Linus Torvalds 已提交
2219
	struct sock *sk = sock->sk;
2220

L
Linus Torvalds 已提交
2221 2222 2223 2224
	if (sk)
		atomic_dec(&pkt_sk(sk)->mapped);
}

2225
static const struct vm_operations_struct packet_mmap_ops = {
E
Eric Dumazet 已提交
2226 2227
	.open	=	packet_mm_open,
	.close	=	packet_mm_close,
L
Linus Torvalds 已提交
2228 2229
};

2230
static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len)
L
Linus Torvalds 已提交
2231 2232 2233
{
	int i;

2234 2235 2236
	for (i = 0; i < len; i++) {
		if (likely(pg_vec[i]))
			free_pages((unsigned long) pg_vec[i], order);
L
Linus Torvalds 已提交
2237 2238 2239 2240
	}
	kfree(pg_vec);
}

2241 2242
static inline char *alloc_one_pg_vec_page(unsigned long order)
{
2243 2244 2245
	gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | __GFP_NOWARN;

	return (char *) __get_free_pages(gfp_flags, order);
2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271
}

static char **alloc_pg_vec(struct tpacket_req *req, int order)
{
	unsigned int block_nr = req->tp_block_nr;
	char **pg_vec;
	int i;

	pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL);
	if (unlikely(!pg_vec))
		goto out;

	for (i = 0; i < block_nr; i++) {
		pg_vec[i] = alloc_one_pg_vec_page(order);
		if (unlikely(!pg_vec[i]))
			goto out_free_pgvec;
	}

out:
	return pg_vec;

out_free_pgvec:
	free_pg_vec(pg_vec, order, block_nr);
	pg_vec = NULL;
	goto out;
}
L
Linus Torvalds 已提交
2272

J
Johann Baudy 已提交
2273 2274
static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
		int closing, int tx_ring)
L
Linus Torvalds 已提交
2275 2276 2277
{
	char **pg_vec = NULL;
	struct packet_sock *po = pkt_sk(sk);
A
Al Viro 已提交
2278
	int was_running, order = 0;
J
Johann Baudy 已提交
2279 2280
	struct packet_ring_buffer *rb;
	struct sk_buff_head *rb_queue;
A
Al Viro 已提交
2281
	__be16 num;
J
Johann Baudy 已提交
2282
	int err;
2283

J
Johann Baudy 已提交
2284 2285
	rb = tx_ring ? &po->tx_ring : &po->rx_ring;
	rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
L
Linus Torvalds 已提交
2286

J
Johann Baudy 已提交
2287 2288 2289 2290 2291 2292 2293
	err = -EBUSY;
	if (!closing) {
		if (atomic_read(&po->mapped))
			goto out;
		if (atomic_read(&rb->pending))
			goto out;
	}
L
Linus Torvalds 已提交
2294

J
Johann Baudy 已提交
2295 2296 2297 2298 2299
	if (req->tp_block_nr) {
		/* Sanity tests and some calculations */
		err = -EBUSY;
		if (unlikely(rb->pg_vec))
			goto out;
L
Linus Torvalds 已提交
2300

2301 2302 2303 2304 2305 2306 2307 2308 2309
		switch (po->tp_version) {
		case TPACKET_V1:
			po->tp_hdrlen = TPACKET_HDRLEN;
			break;
		case TPACKET_V2:
			po->tp_hdrlen = TPACKET2_HDRLEN;
			break;
		}

J
Johann Baudy 已提交
2310
		err = -EINVAL;
2311
		if (unlikely((int)req->tp_block_size <= 0))
J
Johann Baudy 已提交
2312
			goto out;
2313
		if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
J
Johann Baudy 已提交
2314
			goto out;
2315
		if (unlikely(req->tp_frame_size < po->tp_hdrlen +
J
Johann Baudy 已提交
2316 2317
					po->tp_reserve))
			goto out;
2318
		if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
J
Johann Baudy 已提交
2319
			goto out;
L
Linus Torvalds 已提交
2320

J
Johann Baudy 已提交
2321 2322 2323 2324 2325 2326
		rb->frames_per_block = req->tp_block_size/req->tp_frame_size;
		if (unlikely(rb->frames_per_block <= 0))
			goto out;
		if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
					req->tp_frame_nr))
			goto out;
L
Linus Torvalds 已提交
2327 2328

		err = -ENOMEM;
2329 2330 2331
		order = get_order(req->tp_block_size);
		pg_vec = alloc_pg_vec(req, order);
		if (unlikely(!pg_vec))
L
Linus Torvalds 已提交
2332
			goto out;
J
Johann Baudy 已提交
2333 2334 2335 2336
	}
	/* Done */
	else {
		err = -EINVAL;
2337
		if (unlikely(req->tp_frame_nr))
J
Johann Baudy 已提交
2338
			goto out;
L
Linus Torvalds 已提交
2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353
	}

	lock_sock(sk);

	/* Detach socket from network */
	spin_lock(&po->bind_lock);
	was_running = po->running;
	num = po->num;
	if (was_running) {
		__dev_remove_pack(&po->prot_hook);
		po->num = 0;
		po->running = 0;
		__sock_put(sk);
	}
	spin_unlock(&po->bind_lock);
2354

L
Linus Torvalds 已提交
2355 2356 2357
	synchronize_net();

	err = -EBUSY;
2358
	mutex_lock(&po->pg_vec_lock);
L
Linus Torvalds 已提交
2359 2360 2361
	if (closing || atomic_read(&po->mapped) == 0) {
		err = 0;
#define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; })
J
Johann Baudy 已提交
2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375
		spin_lock_bh(&rb_queue->lock);
		pg_vec = XC(rb->pg_vec, pg_vec);
		rb->frame_max = (req->tp_frame_nr - 1);
		rb->head = 0;
		rb->frame_size = req->tp_frame_size;
		spin_unlock_bh(&rb_queue->lock);

		order = XC(rb->pg_vec_order, order);
		req->tp_block_nr = XC(rb->pg_vec_len, req->tp_block_nr);

		rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
		po->prot_hook.func = (po->rx_ring.pg_vec) ?
						tpacket_rcv : packet_rcv;
		skb_queue_purge(rb_queue);
L
Linus Torvalds 已提交
2376 2377
#undef XC
		if (atomic_read(&po->mapped))
E
Eric Dumazet 已提交
2378 2379
			pr_err("packet_mmap: vma is busy: %d\n",
			       atomic_read(&po->mapped));
L
Linus Torvalds 已提交
2380
	}
2381
	mutex_unlock(&po->pg_vec_lock);
L
Linus Torvalds 已提交
2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399

	spin_lock(&po->bind_lock);
	if (was_running && !po->running) {
		sock_hold(sk);
		po->running = 1;
		po->num = num;
		dev_add_pack(&po->prot_hook);
	}
	spin_unlock(&po->bind_lock);

	release_sock(sk);

	if (pg_vec)
		free_pg_vec(pg_vec, order, req->tp_block_nr);
out:
	return err;
}

J
Johann Baudy 已提交
2400 2401
static int packet_mmap(struct file *file, struct socket *sock,
		struct vm_area_struct *vma)
L
Linus Torvalds 已提交
2402 2403 2404
{
	struct sock *sk = sock->sk;
	struct packet_sock *po = pkt_sk(sk);
J
Johann Baudy 已提交
2405 2406
	unsigned long size, expected_size;
	struct packet_ring_buffer *rb;
L
Linus Torvalds 已提交
2407 2408 2409 2410 2411 2412 2413
	unsigned long start;
	int err = -EINVAL;
	int i;

	if (vma->vm_pgoff)
		return -EINVAL;

2414
	mutex_lock(&po->pg_vec_lock);
J
Johann Baudy 已提交
2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425

	expected_size = 0;
	for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
		if (rb->pg_vec) {
			expected_size += rb->pg_vec_len
						* rb->pg_vec_pages
						* PAGE_SIZE;
		}
	}

	if (expected_size == 0)
L
Linus Torvalds 已提交
2426
		goto out;
J
Johann Baudy 已提交
2427 2428 2429

	size = vma->vm_end - vma->vm_start;
	if (size != expected_size)
L
Linus Torvalds 已提交
2430 2431 2432
		goto out;

	start = vma->vm_start;
J
Johann Baudy 已提交
2433 2434 2435 2436 2437 2438 2439 2440 2441
	for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
		if (rb->pg_vec == NULL)
			continue;

		for (i = 0; i < rb->pg_vec_len; i++) {
			struct page *page = virt_to_page(rb->pg_vec[i]);
			int pg_num;

			for (pg_num = 0; pg_num < rb->pg_vec_pages;
E
Eric Dumazet 已提交
2442
					pg_num++, page++) {
J
Johann Baudy 已提交
2443 2444 2445 2446 2447
				err = vm_insert_page(vma, start, page);
				if (unlikely(err))
					goto out;
				start += PAGE_SIZE;
			}
2448
		}
L
Linus Torvalds 已提交
2449
	}
J
Johann Baudy 已提交
2450

2451
	atomic_inc(&po->mapped);
L
Linus Torvalds 已提交
2452 2453 2454 2455
	vma->vm_ops = &packet_mmap_ops;
	err = 0;

out:
2456
	mutex_unlock(&po->pg_vec_lock);
L
Linus Torvalds 已提交
2457 2458 2459
	return err;
}

2460
static const struct proto_ops packet_ops_spkt = {
L
Linus Torvalds 已提交
2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480
	.family =	PF_PACKET,
	.owner =	THIS_MODULE,
	.release =	packet_release,
	.bind =		packet_bind_spkt,
	.connect =	sock_no_connect,
	.socketpair =	sock_no_socketpair,
	.accept =	sock_no_accept,
	.getname =	packet_getname_spkt,
	.poll =		datagram_poll,
	.ioctl =	packet_ioctl,
	.listen =	sock_no_listen,
	.shutdown =	sock_no_shutdown,
	.setsockopt =	sock_no_setsockopt,
	.getsockopt =	sock_no_getsockopt,
	.sendmsg =	packet_sendmsg_spkt,
	.recvmsg =	packet_recvmsg,
	.mmap =		sock_no_mmap,
	.sendpage =	sock_no_sendpage,
};

2481
static const struct proto_ops packet_ops = {
L
Linus Torvalds 已提交
2482 2483 2484 2485 2486 2487 2488
	.family =	PF_PACKET,
	.owner =	THIS_MODULE,
	.release =	packet_release,
	.bind =		packet_bind,
	.connect =	sock_no_connect,
	.socketpair =	sock_no_socketpair,
	.accept =	sock_no_accept,
2489
	.getname =	packet_getname,
L
Linus Torvalds 已提交
2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501
	.poll =		packet_poll,
	.ioctl =	packet_ioctl,
	.listen =	sock_no_listen,
	.shutdown =	sock_no_shutdown,
	.setsockopt =	packet_setsockopt,
	.getsockopt =	packet_getsockopt,
	.sendmsg =	packet_sendmsg,
	.recvmsg =	packet_recvmsg,
	.mmap =		packet_mmap,
	.sendpage =	sock_no_sendpage,
};

2502
static const struct net_proto_family packet_family_ops = {
L
Linus Torvalds 已提交
2503 2504 2505 2506 2507 2508
	.family =	PF_PACKET,
	.create =	packet_create,
	.owner	=	THIS_MODULE,
};

static struct notifier_block packet_netdev_notifier = {
E
Eric Dumazet 已提交
2509
	.notifier_call =	packet_notifier,
L
Linus Torvalds 已提交
2510 2511 2512 2513 2514
};

#ifdef CONFIG_PROC_FS

static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
2515
	__acquires(RCU)
L
Linus Torvalds 已提交
2516
{
2517
	struct net *net = seq_file_net(seq);
2518 2519 2520

	rcu_read_lock();
	return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
L
Linus Torvalds 已提交
2521 2522 2523 2524
}

static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
2525
	struct net *net = seq_file_net(seq);
2526
	return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
L
Linus Torvalds 已提交
2527 2528 2529
}

static void packet_seq_stop(struct seq_file *seq, void *v)
2530
	__releases(RCU)
L
Linus Torvalds 已提交
2531
{
2532
	rcu_read_unlock();
L
Linus Torvalds 已提交
2533 2534
}

2535
static int packet_seq_show(struct seq_file *seq, void *v)
L
Linus Torvalds 已提交
2536 2537 2538 2539
{
	if (v == SEQ_START_TOKEN)
		seq_puts(seq, "sk       RefCnt Type Proto  Iface R Rmem   User   Inode\n");
	else {
2540
		struct sock *s = sk_entry(v);
L
Linus Torvalds 已提交
2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552
		const struct packet_sock *po = pkt_sk(s);

		seq_printf(seq,
			   "%p %-6d %-4d %04x   %-5d %1d %-6u %-6u %-6lu\n",
			   s,
			   atomic_read(&s->sk_refcnt),
			   s->sk_type,
			   ntohs(po->num),
			   po->ifindex,
			   po->running,
			   atomic_read(&s->sk_rmem_alloc),
			   sock_i_uid(s),
E
Eric Dumazet 已提交
2553
			   sock_i_ino(s));
L
Linus Torvalds 已提交
2554 2555 2556 2557 2558
	}

	return 0;
}

2559
static const struct seq_operations packet_seq_ops = {
L
Linus Torvalds 已提交
2560 2561 2562 2563 2564 2565 2566 2567
	.start	= packet_seq_start,
	.next	= packet_seq_next,
	.stop	= packet_seq_stop,
	.show	= packet_seq_show,
};

static int packet_seq_open(struct inode *inode, struct file *file)
{
2568 2569
	return seq_open_net(inode, file, &packet_seq_ops,
			    sizeof(struct seq_net_private));
L
Linus Torvalds 已提交
2570 2571
}

2572
static const struct file_operations packet_seq_fops = {
L
Linus Torvalds 已提交
2573 2574 2575 2576
	.owner		= THIS_MODULE,
	.open		= packet_seq_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
2577
	.release	= seq_release_net,
L
Linus Torvalds 已提交
2578 2579 2580 2581
};

#endif

2582
static int __net_init packet_net_init(struct net *net)
2583
{
2584
	spin_lock_init(&net->packet.sklist_lock);
2585
	INIT_HLIST_HEAD(&net->packet.sklist);
2586 2587 2588 2589 2590 2591 2592

	if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops))
		return -ENOMEM;

	return 0;
}

2593
static void __net_exit packet_net_exit(struct net *net)
2594 2595 2596 2597 2598 2599 2600 2601 2602 2603
{
	proc_net_remove(net, "packet");
}

static struct pernet_operations packet_net_ops = {
	.init = packet_net_init,
	.exit = packet_net_exit,
};


L
Linus Torvalds 已提交
2604 2605 2606
static void __exit packet_exit(void)
{
	unregister_netdevice_notifier(&packet_netdev_notifier);
2607
	unregister_pernet_subsys(&packet_net_ops);
L
Linus Torvalds 已提交
2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619
	sock_unregister(PF_PACKET);
	proto_unregister(&packet_proto);
}

static int __init packet_init(void)
{
	int rc = proto_register(&packet_proto, 0);

	if (rc != 0)
		goto out;

	sock_register(&packet_family_ops);
2620
	register_pernet_subsys(&packet_net_ops);
L
Linus Torvalds 已提交
2621 2622 2623 2624 2625 2626 2627 2628 2629
	register_netdevice_notifier(&packet_netdev_notifier);
out:
	return rc;
}

module_init(packet_init);
module_exit(packet_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NETPROTO(PF_PACKET);