af_packet.c 54.8 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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#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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#ifdef CONFIG_PACKET_MMAP
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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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#endif

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;
#ifdef CONFIG_PACKET_MMAP
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	struct packet_ring_buffer	rx_ring;
	struct packet_ring_buffer	tx_ring;
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	int			copy_thresh;
#endif
	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,
				origdev:1;
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	int			ifindex;	/* bound device		*/
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	__be16			num;
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	struct packet_mclist	*mclist;
#ifdef CONFIG_PACKET_MMAP
	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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#endif
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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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#ifdef CONFIG_PACKET_MMAP

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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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#endif

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;
	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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	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;

	err = -ENOBUFS;
	skb = sock_wmalloc(sk, len + LL_RESERVED_SPACE(dev), 0, GFP_KERNEL);

	/*
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	 * If the write buffer is full, then tough. At this level the user
	 * gets to deal with the problem - do your own algorithmic backoffs.
	 * That's far more flexible.
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	 */
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	if (skb == NULL)
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		goto out_unlock;

	/*
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	 *	Fill it in
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	 */
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	/* 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, LL_RESERVED_SPACE(dev));
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	skb_reset_network_header(skb);
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	/* Try to align data part correctly */
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	if (dev->header_ops) {
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		skb->data -= dev->hard_header_len;
		skb->tail -= dev->hard_header_len;
		if (len < dev->hard_header_len)
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			skb_reset_network_header(skb);
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	}

	/* Returns -EFAULT on error */
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	err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
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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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	if (err)
		goto out_free;

	/*
	 *	Now send it
	 */

	dev_queue_xmit(skb);
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	rcu_read_unlock();
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	return len;
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out_free:
	kfree_skb(skb);
out_unlock:
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	rcu_read_unlock();
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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();
	filter = rcu_dereference(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) {
L
Linus Torvalds 已提交
562 563 564 565 566 567 568 569
		/* 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)
570
			skb_push(skb, skb->data - skb_mac_header(skb));
L
Linus Torvalds 已提交
571 572
		else if (skb->pkt_type == PACKET_OUTGOING) {
			/* Special case: outgoing packets have ll header at head */
573
			skb_pull(skb, skb_network_offset(skb));
L
Linus Torvalds 已提交
574 575 576 577 578
		}
	}

	snaplen = skb->len;

D
David S. Miller 已提交
579 580
	res = run_filter(skb, sk, snaplen);
	if (!res)
581
		goto drop_n_restore;
D
David S. Miller 已提交
582 583
	if (snaplen > res)
		snaplen = res;
L
Linus Torvalds 已提交
584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601

	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;
	}

602 603 604 605
	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
606 607 608 609
	sll->sll_family = AF_PACKET;
	sll->sll_hatype = dev->type;
	sll->sll_protocol = skb->protocol;
	sll->sll_pkttype = skb->pkt_type;
610
	if (unlikely(po->origdev))
611 612 613
		sll->sll_ifindex = orig_dev->ifindex;
	else
		sll->sll_ifindex = dev->ifindex;
L
Linus Torvalds 已提交
614

S
Stephen Hemminger 已提交
615
	sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
L
Linus Torvalds 已提交
616

617
	PACKET_SKB_CB(skb)->origlen = skb->len;
618

L
Linus Torvalds 已提交
619 620 621 622 623
	if (pskb_trim(skb, snaplen))
		goto drop_n_acct;

	skb_set_owner_r(skb, sk);
	skb->dev = NULL;
E
Eric Dumazet 已提交
624
	skb_dst_drop(skb);
L
Linus Torvalds 已提交
625

626 627 628
	/* drop conntrack reference */
	nf_reset(skb);

L
Linus Torvalds 已提交
629 630
	spin_lock(&sk->sk_receive_queue.lock);
	po->stats.tp_packets++;
631
	skb->dropcount = atomic_read(&sk->sk_drops);
L
Linus Torvalds 已提交
632 633 634 635 636 637
	__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:
638
	po->stats.tp_drops = atomic_inc_return(&sk->sk_drops);
L
Linus Torvalds 已提交
639 640 641 642 643 644 645

drop_n_restore:
	if (skb_head != skb->data && skb_shared(skb)) {
		skb->data = skb_head;
		skb->len = skb_len;
	}
drop:
646
	consume_skb(skb);
L
Linus Torvalds 已提交
647 648 649 650
	return 0;
}

#ifdef CONFIG_PACKET_MMAP
E
Eric Dumazet 已提交
651 652
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
653 654 655 656
{
	struct sock *sk;
	struct packet_sock *po;
	struct sockaddr_ll *sll;
657 658 659 660 661
	union {
		struct tpacket_hdr *h1;
		struct tpacket2_hdr *h2;
		void *raw;
	} h;
E
Eric Dumazet 已提交
662
	u8 *skb_head = skb->data;
L
Linus Torvalds 已提交
663
	int skb_len = skb->len;
D
David S. Miller 已提交
664
	unsigned int snaplen, res;
L
Linus Torvalds 已提交
665
	unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
666
	unsigned short macoff, netoff, hdrlen;
L
Linus Torvalds 已提交
667
	struct sk_buff *copy_skb = NULL;
668
	struct timeval tv;
669
	struct timespec ts;
L
Linus Torvalds 已提交
670 671 672 673 674 675 676

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

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

O
Octavian Purdila 已提交
677
	if (!net_eq(dev_net(dev), sock_net(sk)))
678 679
		goto drop;

680
	if (dev->header_ops) {
L
Linus Torvalds 已提交
681
		if (sk->sk_type != SOCK_DGRAM)
682
			skb_push(skb, skb->data - skb_mac_header(skb));
L
Linus Torvalds 已提交
683 684
		else if (skb->pkt_type == PACKET_OUTGOING) {
			/* Special case: outgoing packets have ll header at head */
685
			skb_pull(skb, skb_network_offset(skb));
L
Linus Torvalds 已提交
686 687 688
		}
	}

689 690 691
	if (skb->ip_summed == CHECKSUM_PARTIAL)
		status |= TP_STATUS_CSUMNOTREADY;

L
Linus Torvalds 已提交
692 693
	snaplen = skb->len;

D
David S. Miller 已提交
694 695
	res = run_filter(skb, sk, snaplen);
	if (!res)
696
		goto drop_n_restore;
D
David S. Miller 已提交
697 698
	if (snaplen > res)
		snaplen = res;
L
Linus Torvalds 已提交
699 700

	if (sk->sk_type == SOCK_DGRAM) {
701 702
		macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
				  po->tp_reserve;
L
Linus Torvalds 已提交
703
	} else {
704
		unsigned maclen = skb_network_offset(skb);
705
		netoff = TPACKET_ALIGN(po->tp_hdrlen +
706 707
				       (maclen < 16 ? 16 : maclen)) +
			po->tp_reserve;
L
Linus Torvalds 已提交
708 709 710
		macoff = netoff - maclen;
	}

J
Johann Baudy 已提交
711
	if (macoff + snaplen > po->rx_ring.frame_size) {
L
Linus Torvalds 已提交
712 713 714 715 716 717 718 719 720 721 722 723
		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
724
		snaplen = po->rx_ring.frame_size - macoff;
L
Linus Torvalds 已提交
725 726 727 728 729
		if ((int)snaplen < 0)
			snaplen = 0;
	}

	spin_lock(&sk->sk_receive_queue.lock);
J
Johann Baudy 已提交
730
	h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL);
731
	if (!h.raw)
L
Linus Torvalds 已提交
732
		goto ring_is_full;
J
Johann Baudy 已提交
733
	packet_increment_head(&po->rx_ring);
L
Linus Torvalds 已提交
734 735 736 737 738 739 740 741 742
	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);

743
	skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
L
Linus Torvalds 已提交
744

745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769
	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
770
		h.h2->tp_vlan_tci = vlan_tx_tag_get(skb);
771 772 773 774 775
		hdrlen = sizeof(*h.h2);
		break;
	default:
		BUG();
	}
L
Linus Torvalds 已提交
776

777
	sll = h.raw + TPACKET_ALIGN(hdrlen);
S
Stephen Hemminger 已提交
778
	sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
L
Linus Torvalds 已提交
779 780 781 782
	sll->sll_family = AF_PACKET;
	sll->sll_hatype = dev->type;
	sll->sll_protocol = skb->protocol;
	sll->sll_pkttype = skb->pkt_type;
783
	if (unlikely(po->origdev))
784 785 786
		sll->sll_ifindex = orig_dev->ifindex;
	else
		sll->sll_ifindex = dev->ifindex;
L
Linus Torvalds 已提交
787

788
	__packet_set_status(po, h.raw, status);
R
Ralf Baechle 已提交
789
	smp_mb();
L
Linus Torvalds 已提交
790 791
	{
		struct page *p_start, *p_end;
792
		u8 *h_end = h.raw + macoff + snaplen - 1;
L
Linus Torvalds 已提交
793

794
		p_start = virt_to_page(h.raw);
L
Linus Torvalds 已提交
795 796 797 798 799 800 801 802 803 804 805 806 807 808 809
		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:
810
	kfree_skb(skb);
L
Linus Torvalds 已提交
811 812 813 814 815 816 817
	return 0;

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

	sk->sk_data_ready(sk, 0);
818
	kfree_skb(copy_skb);
L
Linus Torvalds 已提交
819 820 821
	goto drop_n_restore;
}

J
Johann Baudy 已提交
822 823 824
static void tpacket_destruct_skb(struct sk_buff *skb)
{
	struct packet_sock *po = pkt_sk(skb->sk);
E
Eric Dumazet 已提交
825
	void *ph;
L
Linus Torvalds 已提交
826

J
Johann Baudy 已提交
827
	BUG_ON(skb == NULL);
L
Linus Torvalds 已提交
828

J
Johann Baudy 已提交
829 830 831 832 833 834 835 836 837 838 839
	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
840 841 842
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
843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859
{
	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;
860
	skb->mark = po->sk.sk_mark;
J
Johann Baudy 已提交
861 862 863 864 865 866 867 868 869 870 871
	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
872
		pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
J
Johann Baudy 已提交
873 874 875 876 877 878 879 880 881 882 883 884 885 886
		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
887
	} else if (dev->hard_header_len) {
J
Johann Baudy 已提交
888 889
		/* net device doesn't like empty head */
		if (unlikely(tp_len <= dev->hard_header_len)) {
E
Eric Dumazet 已提交
890 891
			pr_err("packet size is too short (%d < %d)\n",
			       tp_len, dev->hard_header_len);
J
Johann Baudy 已提交
892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919
			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
920 921
			pr_err("Packet exceed the number of skb frags(%lu)\n",
			       MAX_SKB_FRAGS);
J
Johann Baudy 已提交
922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945
			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
946 947
	void *ph;
	struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
J
Johann Baudy 已提交
948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986
	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
987
		- (po->tp_hdrlen - sizeof(struct sockaddr_ll));
J
Johann Baudy 已提交
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 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036

	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);
		if (unlikely(err > 0 && (err = net_xmit_errno(err)) != 0))
			goto out_xmit;
		packet_increment_head(&po->tx_ring);
		len_sum += tp_len;
E
Eric Dumazet 已提交
1037
	} while (likely((ph != NULL) || ((!(msg->msg_flags & MSG_DONTWAIT))
J
Johann Baudy 已提交
1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058
					&& (atomic_read(&po->tx_ring.pending))))
	      );

	err = len_sum;
	goto out_put;

out_xmit:
	skb->destructor = sock_wfree;
	atomic_dec(&po->tx_ring.pending);
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;
}
#endif

static int packet_snd(struct socket *sock,
L
Linus Torvalds 已提交
1059 1060 1061
			  struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
E
Eric Dumazet 已提交
1062
	struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
L
Linus Torvalds 已提交
1063 1064
	struct sk_buff *skb;
	struct net_device *dev;
A
Al Viro 已提交
1065
	__be16 proto;
L
Linus Torvalds 已提交
1066 1067 1068 1069
	unsigned char *addr;
	int ifindex, err, reserve = 0;

	/*
1070
	 *	Get and verify the address.
L
Linus Torvalds 已提交
1071
	 */
1072

L
Linus Torvalds 已提交
1073 1074 1075 1076 1077 1078 1079 1080 1081 1082
	if (saddr == NULL) {
		struct packet_sock *po = pkt_sk(sk);

		ifindex	= po->ifindex;
		proto	= po->num;
		addr	= NULL;
	} else {
		err = -EINVAL;
		if (msg->msg_namelen < sizeof(struct sockaddr_ll))
			goto out;
1083 1084
		if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
			goto out;
L
Linus Torvalds 已提交
1085 1086 1087 1088 1089 1090
		ifindex	= saddr->sll_ifindex;
		proto	= saddr->sll_protocol;
		addr	= saddr->sll_addr;
	}


1091
	dev = dev_get_by_index(sock_net(sk), ifindex);
L
Linus Torvalds 已提交
1092 1093 1094 1095 1096 1097
	err = -ENXIO;
	if (dev == NULL)
		goto out_unlock;
	if (sock->type == SOCK_RAW)
		reserve = dev->hard_header_len;

1098 1099 1100 1101
	err = -ENETDOWN;
	if (!(dev->flags & IFF_UP))
		goto out_unlock;

L
Linus Torvalds 已提交
1102 1103 1104 1105
	err = -EMSGSIZE;
	if (len > dev->mtu+reserve)
		goto out_unlock;

1106
	skb = sock_alloc_send_skb(sk, len + LL_ALLOCATED_SPACE(dev),
L
Linus Torvalds 已提交
1107
				msg->msg_flags & MSG_DONTWAIT, &err);
E
Eric Dumazet 已提交
1108
	if (skb == NULL)
L
Linus Torvalds 已提交
1109 1110 1111
		goto out_unlock;

	skb_reserve(skb, LL_RESERVED_SPACE(dev));
1112
	skb_reset_network_header(skb);
L
Linus Torvalds 已提交
1113

1114 1115 1116 1117
	err = -EINVAL;
	if (sock->type == SOCK_DGRAM &&
	    dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len) < 0)
		goto out_free;
L
Linus Torvalds 已提交
1118 1119

	/* Returns -EFAULT on error */
E
Eric Dumazet 已提交
1120
	err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
L
Linus Torvalds 已提交
1121 1122 1123 1124 1125 1126
	if (err)
		goto out_free;

	skb->protocol = proto;
	skb->dev = dev;
	skb->priority = sk->sk_priority;
1127
	skb->mark = sk->sk_mark;
L
Linus Torvalds 已提交
1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138

	/*
	 *	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
1139
	return len;
L
Linus Torvalds 已提交
1140 1141 1142 1143 1144 1145 1146 1147 1148 1149

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

J
Johann Baudy 已提交
1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162
static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
		struct msghdr *msg, size_t len)
{
#ifdef CONFIG_PACKET_MMAP
	struct sock *sk = sock->sk;
	struct packet_sock *po = pkt_sk(sk);
	if (po->tx_ring.pg_vec)
		return tpacket_snd(po, msg);
	else
#endif
		return packet_snd(sock, msg, len);
}

L
Linus Torvalds 已提交
1163 1164 1165 1166 1167 1168 1169 1170 1171
/*
 *	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;
1172
	struct net *net;
J
Johann Baudy 已提交
1173 1174 1175
#ifdef CONFIG_PACKET_MMAP
	struct tpacket_req req;
#endif
L
Linus Torvalds 已提交
1176 1177 1178 1179

	if (!sk)
		return 0;

1180
	net = sock_net(sk);
L
Linus Torvalds 已提交
1181 1182
	po = pkt_sk(sk);

1183
	write_lock_bh(&net->packet.sklist_lock);
L
Linus Torvalds 已提交
1184
	sk_del_node_init(sk);
1185
	sock_prot_inuse_add(net, sk->sk_prot, -1);
1186
	write_unlock_bh(&net->packet.sklist_lock);
L
Linus Torvalds 已提交
1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204

	/*
	 *	Unhook packet receive handler.
	 */

	if (po->running) {
		/*
		 *	Remove the protocol hook
		 */
		dev_remove_pack(&po->prot_hook);
		po->running = 0;
		po->num = 0;
		__sock_put(sk);
	}

	packet_flush_mclist(sk);

#ifdef CONFIG_PACKET_MMAP
J
Johann Baudy 已提交
1205 1206 1207 1208 1209 1210 1211
	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
1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223
#endif

	/*
	 *	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);
1224
	sk_refcnt_debug_release(sk);
L
Linus Torvalds 已提交
1225 1226 1227 1228 1229 1230 1231 1232 1233

	sock_put(sk);
	return 0;
}

/*
 *	Attach a packet hook.
 */

A
Al Viro 已提交
1234
static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
L
Linus Torvalds 已提交
1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261
{
	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;

1262
	if (!dev || (dev->flags & IFF_UP)) {
L
Linus Torvalds 已提交
1263 1264 1265
		dev_add_pack(&po->prot_hook);
		sock_hold(sk);
		po->running = 1;
1266 1267 1268 1269
	} else {
		sk->sk_err = ENETDOWN;
		if (!sock_flag(sk, SOCK_DEAD))
			sk->sk_error_report(sk);
L
Linus Torvalds 已提交
1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281
	}

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
1282 1283
static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
			    int addr_len)
L
Linus Torvalds 已提交
1284
{
E
Eric Dumazet 已提交
1285
	struct sock *sk = sock->sk;
L
Linus Torvalds 已提交
1286 1287 1288
	char name[15];
	struct net_device *dev;
	int err = -ENODEV;
1289

L
Linus Torvalds 已提交
1290 1291 1292
	/*
	 *	Check legality
	 */
1293

1294
	if (addr_len != sizeof(struct sockaddr))
L
Linus Torvalds 已提交
1295
		return -EINVAL;
E
Eric Dumazet 已提交
1296
	strlcpy(name, uaddr->sa_data, sizeof(name));
L
Linus Torvalds 已提交
1297

1298
	dev = dev_get_by_name(sock_net(sk), name);
L
Linus Torvalds 已提交
1299 1300 1301 1302 1303 1304 1305 1306 1307
	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
1308 1309
	struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
	struct sock *sk = sock->sk;
L
Linus Torvalds 已提交
1310 1311 1312 1313 1314 1315 1316
	struct net_device *dev = NULL;
	int err;


	/*
	 *	Check legality
	 */
1317

L
Linus Torvalds 已提交
1318 1319 1320 1321 1322 1323 1324
	if (addr_len < sizeof(struct sockaddr_ll))
		return -EINVAL;
	if (sll->sll_family != AF_PACKET)
		return -EINVAL;

	if (sll->sll_ifindex) {
		err = -ENODEV;
1325
		dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
L
Linus Torvalds 已提交
1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343
		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),
};

/*
1344
 *	Create a packet of type SOCK_PACKET.
L
Linus Torvalds 已提交
1345 1346
 */

1347 1348
static int packet_create(struct net *net, struct socket *sock, int protocol,
			 int kern)
L
Linus Torvalds 已提交
1349 1350 1351
{
	struct sock *sk;
	struct packet_sock *po;
A
Al Viro 已提交
1352
	__be16 proto = (__force __be16)protocol; /* weird, but documented */
L
Linus Torvalds 已提交
1353 1354 1355 1356
	int err;

	if (!capable(CAP_NET_RAW))
		return -EPERM;
1357 1358
	if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
	    sock->type != SOCK_PACKET)
L
Linus Torvalds 已提交
1359 1360 1361 1362 1363
		return -ESOCKTNOSUPPORT;

	sock->state = SS_UNCONNECTED;

	err = -ENOBUFS;
1364
	sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
L
Linus Torvalds 已提交
1365 1366 1367 1368 1369 1370
	if (sk == NULL)
		goto out;

	sock->ops = &packet_ops;
	if (sock->type == SOCK_PACKET)
		sock->ops = &packet_ops_spkt;
1371

L
Linus Torvalds 已提交
1372 1373 1374 1375
	sock_init_data(sock, sk);

	po = pkt_sk(sk);
	sk->sk_family = PF_PACKET;
A
Al Viro 已提交
1376
	po->num = proto;
L
Linus Torvalds 已提交
1377 1378

	sk->sk_destruct = packet_sock_destruct;
1379
	sk_refcnt_debug_inc(sk);
L
Linus Torvalds 已提交
1380 1381 1382 1383 1384 1385

	/*
	 *	Attach a protocol block
	 */

	spin_lock_init(&po->bind_lock);
1386
	mutex_init(&po->pg_vec_lock);
L
Linus Torvalds 已提交
1387
	po->prot_hook.func = packet_rcv;
1388

L
Linus Torvalds 已提交
1389 1390
	if (sock->type == SOCK_PACKET)
		po->prot_hook.func = packet_rcv_spkt;
1391

L
Linus Torvalds 已提交
1392 1393
	po->prot_hook.af_packet_priv = sk;

A
Al Viro 已提交
1394 1395
	if (proto) {
		po->prot_hook.type = proto;
L
Linus Torvalds 已提交
1396 1397 1398 1399 1400
		dev_add_pack(&po->prot_hook);
		sock_hold(sk);
		po->running = 1;
	}

1401 1402
	write_lock_bh(&net->packet.sklist_lock);
	sk_add_node(sk, &net->packet.sklist);
1403
	sock_prot_inuse_add(net, &packet_proto, 1);
1404
	write_unlock_bh(&net->packet.sklist_lock);
E
Eric Dumazet 已提交
1405
	return 0;
L
Linus Torvalds 已提交
1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420
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;
1421
	struct sockaddr_ll *sll;
L
Linus Torvalds 已提交
1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441

	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
1442
	skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
L
Linus Torvalds 已提交
1443 1444

	/*
1445
	 *	An error occurred so return it. Because skb_recv_datagram()
L
Linus Torvalds 已提交
1446 1447 1448 1449
	 *	handles the blocking we don't see and worry about blocking
	 *	retries.
	 */

1450
	if (skb == NULL)
L
Linus Torvalds 已提交
1451 1452
		goto out;

1453 1454 1455 1456 1457
	/*
	 *	If the address length field is there to be filled in, we fill
	 *	it in now.
	 */

1458
	sll = &PACKET_SKB_CB(skb)->sa.ll;
1459 1460 1461 1462 1463
	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
1464 1465 1466 1467 1468 1469
	/*
	 *	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
1470 1471 1472
	if (copied > len) {
		copied = len;
		msg->msg_flags |= MSG_TRUNC;
L
Linus Torvalds 已提交
1473 1474 1475 1476 1477 1478
	}

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

1479
	sock_recv_ts_and_drops(msg, sk, skb);
L
Linus Torvalds 已提交
1480 1481

	if (msg->msg_name)
1482 1483
		memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
		       msg->msg_namelen);
L
Linus Torvalds 已提交
1484

1485
	if (pkt_sk(sk)->auxdata) {
1486 1487 1488 1489 1490 1491 1492 1493
		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;
1494
		aux.tp_net = skb_network_offset(skb);
E
Eric Dumazet 已提交
1495
		aux.tp_vlan_tci = vlan_tx_tag_get(skb);
1496 1497

		put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
1498 1499
	}

L
Linus Torvalds 已提交
1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521
	/*
	 *	Free or return the buffer as appropriate. Again this
	 *	hides all the races and re-entrancy issues from us.
	 */
	err = (flags&MSG_TRUNC) ? skb->len : copied;

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
1522 1523 1524
	rcu_read_lock();
	dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
	if (dev)
L
Linus Torvalds 已提交
1525
		strlcpy(uaddr->sa_data, dev->name, 15);
E
Eric Dumazet 已提交
1526
	else
L
Linus Torvalds 已提交
1527
		memset(uaddr->sa_data, 0, 14);
E
Eric Dumazet 已提交
1528
	rcu_read_unlock();
L
Linus Torvalds 已提交
1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539
	*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);
1540
	DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
L
Linus Torvalds 已提交
1541 1542 1543 1544 1545 1546 1547

	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
1548 1549
	rcu_read_lock();
	dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
L
Linus Torvalds 已提交
1550 1551 1552 1553 1554 1555 1556 1557
	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
1558
	rcu_read_unlock();
1559
	*uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
L
Linus Torvalds 已提交
1560 1561 1562 1563

	return 0;
}

1564 1565
static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
			 int what)
L
Linus Torvalds 已提交
1566 1567 1568 1569
{
	switch (i->type) {
	case PACKET_MR_MULTICAST:
		if (what > 0)
1570
			return dev_mc_add(dev, i->addr, i->alen, 0);
L
Linus Torvalds 已提交
1571
		else
1572
			return dev_mc_delete(dev, i->addr, i->alen, 0);
L
Linus Torvalds 已提交
1573 1574
		break;
	case PACKET_MR_PROMISC:
1575
		return dev_set_promiscuity(dev, what);
L
Linus Torvalds 已提交
1576 1577
		break;
	case PACKET_MR_ALLMULTI:
1578
		return dev_set_allmulti(dev, what);
L
Linus Torvalds 已提交
1579
		break;
1580 1581
	case PACKET_MR_UNICAST:
		if (what > 0)
J
Jiri Pirko 已提交
1582
			return dev_unicast_add(dev, i->addr);
1583
		else
J
Jiri Pirko 已提交
1584
			return dev_unicast_delete(dev, i->addr);
1585
		break;
E
Eric Dumazet 已提交
1586 1587
	default:
		break;
L
Linus Torvalds 已提交
1588
	}
1589
	return 0;
L
Linus Torvalds 已提交
1590 1591 1592 1593
}

static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
{
E
Eric Dumazet 已提交
1594
	for ( ; i; i = i->next) {
L
Linus Torvalds 已提交
1595 1596 1597 1598 1599
		if (i->ifindex == dev->ifindex)
			packet_dev_mc(dev, i, what);
	}
}

1600
static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
L
Linus Torvalds 已提交
1601 1602 1603 1604 1605 1606 1607 1608 1609
{
	struct packet_sock *po = pkt_sk(sk);
	struct packet_mclist *ml, *i;
	struct net_device *dev;
	int err;

	rtnl_lock();

	err = -ENODEV;
1610
	dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
L
Linus Torvalds 已提交
1611 1612 1613 1614 1615 1616 1617 1618
	if (!dev)
		goto done;

	err = -EINVAL;
	if (mreq->mr_alen > dev->addr_len)
		goto done;

	err = -ENOBUFS;
1619
	i = kmalloc(sizeof(*i), GFP_KERNEL);
L
Linus Torvalds 已提交
1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642
	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;
1643 1644 1645 1646 1647
	err = packet_dev_mc(dev, i, 1);
	if (err) {
		po->mclist = i->next;
		kfree(i);
	}
L
Linus Torvalds 已提交
1648 1649 1650 1651 1652 1653

done:
	rtnl_unlock();
	return err;
}

1654
static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
L
Linus Torvalds 已提交
1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667
{
	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;
1668 1669
				dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
				if (dev)
L
Linus Torvalds 已提交
1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693
					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;
1694 1695
		dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
		if (dev != NULL)
L
Linus Torvalds 已提交
1696 1697 1698 1699 1700 1701 1702
			packet_dev_mc(dev, ml, -1);
		kfree(ml);
	}
	rtnl_unlock();
}

static int
1703
packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
L
Linus Torvalds 已提交
1704 1705
{
	struct sock *sk = sock->sk;
1706
	struct packet_sock *po = pkt_sk(sk);
L
Linus Torvalds 已提交
1707 1708 1709 1710 1711
	int ret;

	if (level != SOL_PACKET)
		return -ENOPROTOOPT;

J
Johann Baudy 已提交
1712
	switch (optname) {
1713
	case PACKET_ADD_MEMBERSHIP:
L
Linus Torvalds 已提交
1714 1715
	case PACKET_DROP_MEMBERSHIP:
	{
1716 1717 1718 1719
		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
1720
			return -EINVAL;
1721 1722
		if (len > sizeof(mreq))
			len = sizeof(mreq);
E
Eric Dumazet 已提交
1723
		if (copy_from_user(&mreq, optval, len))
L
Linus Torvalds 已提交
1724
			return -EFAULT;
1725 1726
		if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
			return -EINVAL;
L
Linus Torvalds 已提交
1727 1728 1729 1730 1731 1732
		if (optname == PACKET_ADD_MEMBERSHIP)
			ret = packet_mc_add(sk, &mreq);
		else
			ret = packet_mc_drop(sk, &mreq);
		return ret;
	}
1733

L
Linus Torvalds 已提交
1734 1735
#ifdef CONFIG_PACKET_MMAP
	case PACKET_RX_RING:
J
Johann Baudy 已提交
1736
	case PACKET_TX_RING:
L
Linus Torvalds 已提交
1737 1738 1739
	{
		struct tpacket_req req;

E
Eric Dumazet 已提交
1740
		if (optlen < sizeof(req))
L
Linus Torvalds 已提交
1741
			return -EINVAL;
E
Eric Dumazet 已提交
1742
		if (copy_from_user(&req, optval, sizeof(req)))
L
Linus Torvalds 已提交
1743
			return -EFAULT;
J
Johann Baudy 已提交
1744
		return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING);
L
Linus Torvalds 已提交
1745 1746 1747 1748 1749
	}
	case PACKET_COPY_THRESH:
	{
		int val;

E
Eric Dumazet 已提交
1750
		if (optlen != sizeof(val))
L
Linus Torvalds 已提交
1751
			return -EINVAL;
E
Eric Dumazet 已提交
1752
		if (copy_from_user(&val, optval, sizeof(val)))
L
Linus Torvalds 已提交
1753 1754 1755 1756 1757
			return -EFAULT;

		pkt_sk(sk)->copy_thresh = val;
		return 0;
	}
1758 1759 1760 1761 1762 1763
	case PACKET_VERSION:
	{
		int val;

		if (optlen != sizeof(val))
			return -EINVAL;
J
Johann Baudy 已提交
1764
		if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776
			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;
		}
	}
1777 1778 1779 1780 1781 1782
	case PACKET_RESERVE:
	{
		unsigned int val;

		if (optlen != sizeof(val))
			return -EINVAL;
J
Johann Baudy 已提交
1783
		if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1784 1785 1786 1787 1788 1789
			return -EBUSY;
		if (copy_from_user(&val, optval, sizeof(val)))
			return -EFAULT;
		po->tp_reserve = val;
		return 0;
	}
J
Johann Baudy 已提交
1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802
	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;
	}
L
Linus Torvalds 已提交
1803
#endif
1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815
	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;
	}
1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827
	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;
	}
L
Linus Torvalds 已提交
1828 1829 1830 1831 1832 1833 1834 1835 1836
	default:
		return -ENOPROTOOPT;
	}
}

static int packet_getsockopt(struct socket *sock, int level, int optname,
			     char __user *optval, int __user *optlen)
{
	int len;
1837
	int val;
L
Linus Torvalds 已提交
1838 1839
	struct sock *sk = sock->sk;
	struct packet_sock *po = pkt_sk(sk);
1840 1841
	void *data;
	struct tpacket_stats st;
L
Linus Torvalds 已提交
1842 1843 1844 1845

	if (level != SOL_PACKET)
		return -ENOPROTOOPT;

1846 1847
	if (get_user(len, optlen))
		return -EFAULT;
L
Linus Torvalds 已提交
1848 1849 1850

	if (len < 0)
		return -EINVAL;
1851

J
Johann Baudy 已提交
1852
	switch (optname) {
L
Linus Torvalds 已提交
1853 1854 1855 1856 1857 1858 1859 1860 1861
	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;

1862 1863 1864 1865 1866 1867 1868
		data = &st;
		break;
	case PACKET_AUXDATA:
		if (len > sizeof(int))
			len = sizeof(int);
		val = po->auxdata;

1869 1870 1871 1872 1873 1874 1875
		data = &val;
		break;
	case PACKET_ORIGDEV:
		if (len > sizeof(int))
			len = sizeof(int);
		val = po->origdev;

1876
		data = &val;
L
Linus Torvalds 已提交
1877
		break;
1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901
#ifdef CONFIG_PACKET_MMAP
	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;
1902 1903 1904 1905 1906 1907
	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
1908 1909 1910 1911 1912 1913
	case PACKET_LOSS:
		if (len > sizeof(unsigned int))
			len = sizeof(unsigned int);
		val = po->tp_loss;
		data = &val;
		break;
1914
#endif
L
Linus Torvalds 已提交
1915 1916 1917 1918
	default:
		return -ENOPROTOOPT;
	}

1919 1920
	if (put_user(len, optlen))
		return -EFAULT;
1921 1922
	if (copy_to_user(optval, data, len))
		return -EFAULT;
1923
	return 0;
L
Linus Torvalds 已提交
1924 1925 1926 1927 1928 1929 1930
}


static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
{
	struct sock *sk;
	struct hlist_node *node;
1931
	struct net_device *dev = data;
1932
	struct net *net = dev_net(dev);
L
Linus Torvalds 已提交
1933

1934 1935
	read_lock(&net->packet.sklist_lock);
	sk_for_each(sk, node, &net->packet.sklist) {
L
Linus Torvalds 已提交
1936 1937 1938 1939 1940 1941
		struct packet_sock *po = pkt_sk(sk);

		switch (msg) {
		case NETDEV_UNREGISTER:
			if (po->mclist)
				packet_dev_mclist(dev, po->mclist, -1);
1942 1943
			/* fallthrough */

L
Linus Torvalds 已提交
1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973
		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:
			spin_lock(&po->bind_lock);
			if (dev->ifindex == po->ifindex && po->num &&
			    !po->running) {
				dev_add_pack(&po->prot_hook);
				sock_hold(sk);
				po->running = 1;
			}
			spin_unlock(&po->bind_lock);
			break;
		}
	}
1974
	read_unlock(&net->packet.sklist_lock);
L
Linus Torvalds 已提交
1975 1976 1977 1978 1979 1980 1981 1982 1983
	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
1984
	switch (cmd) {
E
Eric Dumazet 已提交
1985 1986 1987
	case SIOCOUTQ:
	{
		int amount = sk_wmem_alloc_get(sk);
1988

E
Eric Dumazet 已提交
1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006
		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);
2007

L
Linus Torvalds 已提交
2008
#ifdef CONFIG_INET
E
Eric Dumazet 已提交
2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
	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
2026 2027
#endif

E
Eric Dumazet 已提交
2028 2029
	default:
		return -ENOIOCTLCMD;
L
Linus Torvalds 已提交
2030 2031 2032 2033 2034 2035 2036 2037 2038
	}
	return 0;
}

#ifndef CONFIG_PACKET_MMAP
#define packet_mmap sock_no_mmap
#define packet_poll datagram_poll
#else

E
Eric Dumazet 已提交
2039
static unsigned int packet_poll(struct file *file, struct socket *sock,
L
Linus Torvalds 已提交
2040 2041 2042 2043 2044 2045 2046
				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
2047 2048
	if (po->rx_ring.pg_vec) {
		if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL))
L
Linus Torvalds 已提交
2049 2050 2051
			mask |= POLLIN | POLLRDNORM;
	}
	spin_unlock_bh(&sk->sk_receive_queue.lock);
J
Johann Baudy 已提交
2052 2053 2054 2055 2056 2057
	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
2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068
	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
2069
	struct socket *sock = file->private_data;
L
Linus Torvalds 已提交
2070
	struct sock *sk = sock->sk;
2071

L
Linus Torvalds 已提交
2072 2073 2074 2075 2076 2077 2078
	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
2079
	struct socket *sock = file->private_data;
L
Linus Torvalds 已提交
2080
	struct sock *sk = sock->sk;
2081

L
Linus Torvalds 已提交
2082 2083 2084 2085
	if (sk)
		atomic_dec(&pkt_sk(sk)->mapped);
}

2086
static const struct vm_operations_struct packet_mmap_ops = {
E
Eric Dumazet 已提交
2087 2088
	.open	=	packet_mm_open,
	.close	=	packet_mm_close,
L
Linus Torvalds 已提交
2089 2090
};

2091
static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len)
L
Linus Torvalds 已提交
2092 2093 2094
{
	int i;

2095 2096 2097
	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
2098 2099 2100 2101
	}
	kfree(pg_vec);
}

2102 2103
static inline char *alloc_one_pg_vec_page(unsigned long order)
{
2104 2105 2106
	gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | __GFP_NOWARN;

	return (char *) __get_free_pages(gfp_flags, order);
2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132
}

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
2133

J
Johann Baudy 已提交
2134 2135
static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
		int closing, int tx_ring)
L
Linus Torvalds 已提交
2136 2137 2138
{
	char **pg_vec = NULL;
	struct packet_sock *po = pkt_sk(sk);
A
Al Viro 已提交
2139
	int was_running, order = 0;
J
Johann Baudy 已提交
2140 2141
	struct packet_ring_buffer *rb;
	struct sk_buff_head *rb_queue;
A
Al Viro 已提交
2142
	__be16 num;
J
Johann Baudy 已提交
2143
	int err;
2144

J
Johann Baudy 已提交
2145 2146
	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
2147

J
Johann Baudy 已提交
2148 2149 2150 2151 2152 2153 2154
	err = -EBUSY;
	if (!closing) {
		if (atomic_read(&po->mapped))
			goto out;
		if (atomic_read(&rb->pending))
			goto out;
	}
L
Linus Torvalds 已提交
2155

J
Johann Baudy 已提交
2156 2157 2158 2159 2160
	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
2161

2162 2163 2164 2165 2166 2167 2168 2169 2170
		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
2171
		err = -EINVAL;
2172
		if (unlikely((int)req->tp_block_size <= 0))
J
Johann Baudy 已提交
2173
			goto out;
2174
		if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
J
Johann Baudy 已提交
2175
			goto out;
2176
		if (unlikely(req->tp_frame_size < po->tp_hdrlen +
J
Johann Baudy 已提交
2177 2178
					po->tp_reserve))
			goto out;
2179
		if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
J
Johann Baudy 已提交
2180
			goto out;
L
Linus Torvalds 已提交
2181

J
Johann Baudy 已提交
2182 2183 2184 2185 2186 2187
		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
2188 2189

		err = -ENOMEM;
2190 2191 2192
		order = get_order(req->tp_block_size);
		pg_vec = alloc_pg_vec(req, order);
		if (unlikely(!pg_vec))
L
Linus Torvalds 已提交
2193
			goto out;
J
Johann Baudy 已提交
2194 2195 2196 2197
	}
	/* Done */
	else {
		err = -EINVAL;
2198
		if (unlikely(req->tp_frame_nr))
J
Johann Baudy 已提交
2199
			goto out;
L
Linus Torvalds 已提交
2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214
	}

	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);
2215

L
Linus Torvalds 已提交
2216 2217 2218
	synchronize_net();

	err = -EBUSY;
2219
	mutex_lock(&po->pg_vec_lock);
L
Linus Torvalds 已提交
2220 2221 2222
	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
2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236
		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
2237 2238
#undef XC
		if (atomic_read(&po->mapped))
E
Eric Dumazet 已提交
2239 2240
			pr_err("packet_mmap: vma is busy: %d\n",
			       atomic_read(&po->mapped));
L
Linus Torvalds 已提交
2241
	}
2242
	mutex_unlock(&po->pg_vec_lock);
L
Linus Torvalds 已提交
2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260

	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
2261 2262
static int packet_mmap(struct file *file, struct socket *sock,
		struct vm_area_struct *vma)
L
Linus Torvalds 已提交
2263 2264 2265
{
	struct sock *sk = sock->sk;
	struct packet_sock *po = pkt_sk(sk);
J
Johann Baudy 已提交
2266 2267
	unsigned long size, expected_size;
	struct packet_ring_buffer *rb;
L
Linus Torvalds 已提交
2268 2269 2270 2271 2272 2273 2274
	unsigned long start;
	int err = -EINVAL;
	int i;

	if (vma->vm_pgoff)
		return -EINVAL;

2275
	mutex_lock(&po->pg_vec_lock);
J
Johann Baudy 已提交
2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286

	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
2287
		goto out;
J
Johann Baudy 已提交
2288 2289 2290

	size = vma->vm_end - vma->vm_start;
	if (size != expected_size)
L
Linus Torvalds 已提交
2291 2292 2293
		goto out;

	start = vma->vm_start;
J
Johann Baudy 已提交
2294 2295 2296 2297 2298 2299 2300 2301 2302
	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
2303
					pg_num++, page++) {
J
Johann Baudy 已提交
2304 2305 2306 2307 2308
				err = vm_insert_page(vma, start, page);
				if (unlikely(err))
					goto out;
				start += PAGE_SIZE;
			}
2309
		}
L
Linus Torvalds 已提交
2310
	}
J
Johann Baudy 已提交
2311

2312
	atomic_inc(&po->mapped);
L
Linus Torvalds 已提交
2313 2314 2315 2316
	vma->vm_ops = &packet_mmap_ops;
	err = 0;

out:
2317
	mutex_unlock(&po->pg_vec_lock);
L
Linus Torvalds 已提交
2318 2319 2320 2321 2322
	return err;
}
#endif


2323
static const struct proto_ops packet_ops_spkt = {
L
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2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343
	.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,
};

2344
static const struct proto_ops packet_ops = {
L
Linus Torvalds 已提交
2345 2346 2347 2348 2349 2350 2351
	.family =	PF_PACKET,
	.owner =	THIS_MODULE,
	.release =	packet_release,
	.bind =		packet_bind,
	.connect =	sock_no_connect,
	.socketpair =	sock_no_socketpair,
	.accept =	sock_no_accept,
2352
	.getname =	packet_getname,
L
Linus Torvalds 已提交
2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364
	.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,
};

2365
static const struct net_proto_family packet_family_ops = {
L
Linus Torvalds 已提交
2366 2367 2368 2369 2370 2371
	.family =	PF_PACKET,
	.create =	packet_create,
	.owner	=	THIS_MODULE,
};

static struct notifier_block packet_netdev_notifier = {
E
Eric Dumazet 已提交
2372
	.notifier_call =	packet_notifier,
L
Linus Torvalds 已提交
2373 2374 2375
};

#ifdef CONFIG_PROC_FS
2376
static inline struct sock *packet_seq_idx(struct net *net, loff_t off)
L
Linus Torvalds 已提交
2377 2378 2379 2380
{
	struct sock *s;
	struct hlist_node *node;

2381
	sk_for_each(s, node, &net->packet.sklist) {
L
Linus Torvalds 已提交
2382 2383 2384 2385 2386 2387 2388
		if (!off--)
			return s;
	}
	return NULL;
}

static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
2389
	__acquires(seq_file_net(seq)->packet.sklist_lock)
L
Linus Torvalds 已提交
2390
{
2391
	struct net *net = seq_file_net(seq);
2392
	read_lock(&net->packet.sklist_lock);
2393
	return *pos ? packet_seq_idx(net, *pos - 1) : SEQ_START_TOKEN;
L
Linus Torvalds 已提交
2394 2395 2396 2397
}

static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
2398
	struct net *net = seq_file_net(seq);
L
Linus Torvalds 已提交
2399
	++*pos;
2400
	return  (v == SEQ_START_TOKEN)
2401
		? sk_head(&net->packet.sklist)
E
Eric Dumazet 已提交
2402
		: sk_next((struct sock *)v) ;
L
Linus Torvalds 已提交
2403 2404 2405
}

static void packet_seq_stop(struct seq_file *seq, void *v)
2406
	__releases(seq_file_net(seq)->packet.sklist_lock)
L
Linus Torvalds 已提交
2407
{
2408
	struct net *net = seq_file_net(seq);
2409
	read_unlock(&net->packet.sklist_lock);
L
Linus Torvalds 已提交
2410 2411
}

2412
static int packet_seq_show(struct seq_file *seq, void *v)
L
Linus Torvalds 已提交
2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429
{
	if (v == SEQ_START_TOKEN)
		seq_puts(seq, "sk       RefCnt Type Proto  Iface R Rmem   User   Inode\n");
	else {
		struct sock *s = v;
		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
2430
			   sock_i_ino(s));
L
Linus Torvalds 已提交
2431 2432 2433 2434 2435
	}

	return 0;
}

2436
static const struct seq_operations packet_seq_ops = {
L
Linus Torvalds 已提交
2437 2438 2439 2440 2441 2442 2443 2444
	.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)
{
2445 2446
	return seq_open_net(inode, file, &packet_seq_ops,
			    sizeof(struct seq_net_private));
L
Linus Torvalds 已提交
2447 2448
}

2449
static const struct file_operations packet_seq_fops = {
L
Linus Torvalds 已提交
2450 2451 2452 2453
	.owner		= THIS_MODULE,
	.open		= packet_seq_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
2454
	.release	= seq_release_net,
L
Linus Torvalds 已提交
2455 2456 2457 2458
};

#endif

2459 2460
static int packet_net_init(struct net *net)
{
2461 2462
	rwlock_init(&net->packet.sklist_lock);
	INIT_HLIST_HEAD(&net->packet.sklist);
2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480

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

	return 0;
}

static void packet_net_exit(struct net *net)
{
	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
2481 2482 2483
static void __exit packet_exit(void)
{
	unregister_netdevice_notifier(&packet_netdev_notifier);
2484
	unregister_pernet_subsys(&packet_net_ops);
L
Linus Torvalds 已提交
2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496
	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);
2497
	register_pernet_subsys(&packet_net_ops);
L
Linus Torvalds 已提交
2498 2499 2500 2501 2502 2503 2504 2505 2506
	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);