af_packet.c 69.0 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 <linux/slab.h>
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#include <linux/vmalloc.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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#include <linux/errqueue.h>
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#include <linux/net_tstamp.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);

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struct pgv {
	char *buffer;
};

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struct packet_ring_buffer {
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	struct pgv		*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);

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struct packet_fanout;
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struct packet_sock {
	/* struct sock has to be the first member of packet_sock */
	struct sock		sk;
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	struct packet_fanout	*fanout;
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	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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	unsigned int		tp_tstamp;
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	struct packet_type	prot_hook ____cacheline_aligned_in_smp;
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};

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#define PACKET_FANOUT_MAX	256

struct packet_fanout {
#ifdef CONFIG_NET_NS
	struct net		*net;
#endif
	unsigned int		num_members;
	u16			id;
	u8			type;
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	u8			defrag;
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	atomic_t		rr_cur;
	struct list_head	list;
	struct sock		*arr[PACKET_FANOUT_MAX];
	spinlock_t		lock;
	atomic_t		sk_ref;
	struct packet_type	prot_hook ____cacheline_aligned_in_smp;
};

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

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static void __fanout_unlink(struct sock *sk, struct packet_sock *po);
static void __fanout_link(struct sock *sk, struct packet_sock *po);

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/* register_prot_hook must be invoked with the po->bind_lock held,
 * or from a context in which asynchronous accesses to the packet
 * socket is not possible (packet_create()).
 */
static void register_prot_hook(struct sock *sk)
{
	struct packet_sock *po = pkt_sk(sk);
	if (!po->running) {
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		if (po->fanout)
			__fanout_link(sk, po);
		else
			dev_add_pack(&po->prot_hook);
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		sock_hold(sk);
		po->running = 1;
	}
}

/* {,__}unregister_prot_hook() must be invoked with the po->bind_lock
 * held.   If the sync parameter is true, we will temporarily drop
 * the po->bind_lock and do a synchronize_net to make sure no
 * asynchronous packet processing paths still refer to the elements
 * of po->prot_hook.  If the sync parameter is false, it is the
 * callers responsibility to take care of this.
 */
static void __unregister_prot_hook(struct sock *sk, bool sync)
{
	struct packet_sock *po = pkt_sk(sk);

	po->running = 0;
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	if (po->fanout)
		__fanout_unlink(sk, po);
	else
		__dev_remove_pack(&po->prot_hook);
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	__sock_put(sk);

	if (sync) {
		spin_unlock(&po->bind_lock);
		synchronize_net();
		spin_lock(&po->bind_lock);
	}
}

static void unregister_prot_hook(struct sock *sk, bool sync)
{
	struct packet_sock *po = pkt_sk(sk);

	if (po->running)
		__unregister_prot_hook(sk, sync);
}

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static inline __pure struct page *pgv_to_page(void *addr)
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{
	if (is_vmalloc_addr(addr))
		return vmalloc_to_page(addr);
	return virt_to_page(addr);
}

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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;
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		flush_dcache_page(pgv_to_page(&h.h1->tp_status));
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		break;
	case TPACKET_V2:
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		h.h2->tp_status = status;
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		flush_dcache_page(pgv_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(pgv_to_page(&h.h1->tp_status));
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		return h.h1->tp_status;
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	case TPACKET_V2:
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		flush_dcache_page(pgv_to_page(&h.h2->tp_status));
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		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;

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	h.raw = rb->pg_vec[pg_vec_pos].buffer +
		(frame_offset * rb->frame_size);
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	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 void packet_sock_destruct(struct sock *sk)
{
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	skb_queue_purge(&sk->sk_error_queue);

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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 int fanout_rr_next(struct packet_fanout *f, unsigned int num)
{
	int x = atomic_read(&f->rr_cur) + 1;

	if (x >= num)
		x = 0;

	return x;
}

static struct sock *fanout_demux_hash(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
{
	u32 idx, hash = skb->rxhash;

	idx = ((u64)hash * num) >> 32;

	return f->arr[idx];
}

static struct sock *fanout_demux_lb(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
{
	int cur, old;

	cur = atomic_read(&f->rr_cur);
	while ((old = atomic_cmpxchg(&f->rr_cur, cur,
				     fanout_rr_next(f, num))) != cur)
		cur = old;
	return f->arr[cur];
}

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static struct sock *fanout_demux_cpu(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
{
	unsigned int cpu = smp_processor_id();

	return f->arr[cpu % num];
}

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static struct sk_buff *fanout_check_defrag(struct sk_buff *skb)
{
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#ifdef CONFIG_INET
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	const struct iphdr *iph;
	u32 len;

	if (skb->protocol != htons(ETH_P_IP))
		return skb;

	if (!pskb_may_pull(skb, sizeof(struct iphdr)))
		return skb;

	iph = ip_hdr(skb);
	if (iph->ihl < 5 || iph->version != 4)
		return skb;
	if (!pskb_may_pull(skb, iph->ihl*4))
		return skb;
	iph = ip_hdr(skb);
	len = ntohs(iph->tot_len);
	if (skb->len < len || len < (iph->ihl * 4))
		return skb;

	if (ip_is_fragment(ip_hdr(skb))) {
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		skb = skb_share_check(skb, GFP_ATOMIC);
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		if (skb) {
			if (pskb_trim_rcsum(skb, len))
				return skb;
			memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
			if (ip_defrag(skb, IP_DEFRAG_AF_PACKET))
				return NULL;
			skb->rxhash = 0;
		}
	}
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#endif
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	return skb;
}

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static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
			     struct packet_type *pt, struct net_device *orig_dev)
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{
	struct packet_fanout *f = pt->af_packet_priv;
	unsigned int num = f->num_members;
	struct packet_sock *po;
	struct sock *sk;

	if (!net_eq(dev_net(dev), read_pnet(&f->net)) ||
	    !num) {
		kfree_skb(skb);
		return 0;
	}

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	switch (f->type) {
	case PACKET_FANOUT_HASH:
	default:
		if (f->defrag) {
			skb = fanout_check_defrag(skb);
			if (!skb)
				return 0;
		}
		skb_get_rxhash(skb);
		sk = fanout_demux_hash(f, skb, num);
		break;
	case PACKET_FANOUT_LB:
		sk = fanout_demux_lb(f, skb, num);
		break;
	case PACKET_FANOUT_CPU:
		sk = fanout_demux_cpu(f, skb, num);
		break;
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	}

	po = pkt_sk(sk);

	return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev);
}

static DEFINE_MUTEX(fanout_mutex);
static LIST_HEAD(fanout_list);

static void __fanout_link(struct sock *sk, struct packet_sock *po)
{
	struct packet_fanout *f = po->fanout;

	spin_lock(&f->lock);
	f->arr[f->num_members] = sk;
	smp_wmb();
	f->num_members++;
	spin_unlock(&f->lock);
}

static void __fanout_unlink(struct sock *sk, struct packet_sock *po)
{
	struct packet_fanout *f = po->fanout;
	int i;

	spin_lock(&f->lock);
	for (i = 0; i < f->num_members; i++) {
		if (f->arr[i] == sk)
			break;
	}
	BUG_ON(i >= f->num_members);
	f->arr[i] = f->arr[f->num_members - 1];
	f->num_members--;
	spin_unlock(&f->lock);
}

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static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
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{
	struct packet_sock *po = pkt_sk(sk);
	struct packet_fanout *f, *match;
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	u8 type = type_flags & 0xff;
	u8 defrag = (type_flags & PACKET_FANOUT_FLAG_DEFRAG) ? 1 : 0;
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	int err;

	switch (type) {
	case PACKET_FANOUT_HASH:
	case PACKET_FANOUT_LB:
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	case PACKET_FANOUT_CPU:
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		break;
	default:
		return -EINVAL;
	}

	if (!po->running)
		return -EINVAL;

	if (po->fanout)
		return -EALREADY;

	mutex_lock(&fanout_mutex);
	match = NULL;
	list_for_each_entry(f, &fanout_list, list) {
		if (f->id == id &&
		    read_pnet(&f->net) == sock_net(sk)) {
			match = f;
			break;
		}
	}
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	err = -EINVAL;
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	if (match && match->defrag != defrag)
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		goto out;
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	if (!match) {
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		err = -ENOMEM;
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		match = kzalloc(sizeof(*match), GFP_KERNEL);
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		if (!match)
			goto out;
		write_pnet(&match->net, sock_net(sk));
		match->id = id;
		match->type = type;
		match->defrag = defrag;
		atomic_set(&match->rr_cur, 0);
		INIT_LIST_HEAD(&match->list);
		spin_lock_init(&match->lock);
		atomic_set(&match->sk_ref, 0);
		match->prot_hook.type = po->prot_hook.type;
		match->prot_hook.dev = po->prot_hook.dev;
		match->prot_hook.func = packet_rcv_fanout;
		match->prot_hook.af_packet_priv = match;
		dev_add_pack(&match->prot_hook);
		list_add(&match->list, &fanout_list);
D
David S. Miller 已提交
616
	}
E
Eric Dumazet 已提交
617 618 619 620 621 622 623 624 625 626 627
	err = -EINVAL;
	if (match->type == type &&
	    match->prot_hook.type == po->prot_hook.type &&
	    match->prot_hook.dev == po->prot_hook.dev) {
		err = -ENOSPC;
		if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
			__dev_remove_pack(&po->prot_hook);
			po->fanout = match;
			atomic_inc(&match->sk_ref);
			__fanout_link(sk, po);
			err = 0;
D
David S. Miller 已提交
628 629
		}
	}
E
Eric Dumazet 已提交
630
out:
D
David S. Miller 已提交
631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653
	mutex_unlock(&fanout_mutex);
	return err;
}

static void fanout_release(struct sock *sk)
{
	struct packet_sock *po = pkt_sk(sk);
	struct packet_fanout *f;

	f = po->fanout;
	if (!f)
		return;

	po->fanout = NULL;

	mutex_lock(&fanout_mutex);
	if (atomic_dec_and_test(&f->sk_ref)) {
		list_del(&f->list);
		dev_remove_pack(&f->prot_hook);
		kfree(f);
	}
	mutex_unlock(&fanout_mutex);
}
L
Linus Torvalds 已提交
654

655
static const struct proto_ops packet_ops;
L
Linus Torvalds 已提交
656

657
static const struct proto_ops packet_ops_spkt;
L
Linus Torvalds 已提交
658

E
Eric Dumazet 已提交
659 660
static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
			   struct packet_type *pt, struct net_device *orig_dev)
L
Linus Torvalds 已提交
661 662 663 664 665 666 667 668 669 670
{
	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;
671

L
Linus Torvalds 已提交
672 673 674 675 676 677 678
	/*
	 *	Yank back the headers [hope the device set this
	 *	right or kerboom...]
	 *
	 *	Incoming packets have ll header pulled,
	 *	push it back.
	 *
679
	 *	For outgoing ones skb->data == skb_mac_header(skb)
L
Linus Torvalds 已提交
680 681 682 683 684 685
	 *	so that this procedure is noop.
	 */

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

O
Octavian Purdila 已提交
686
	if (!net_eq(dev_net(dev), sock_net(sk)))
687 688
		goto out;

E
Eric Dumazet 已提交
689 690
	skb = skb_share_check(skb, GFP_ATOMIC);
	if (skb == NULL)
L
Linus Torvalds 已提交
691 692 693
		goto oom;

	/* drop any routing info */
E
Eric Dumazet 已提交
694
	skb_dst_drop(skb);
L
Linus Torvalds 已提交
695

696 697 698
	/* drop conntrack reference */
	nf_reset(skb);

699
	spkt = &PACKET_SKB_CB(skb)->sa.pkt;
L
Linus Torvalds 已提交
700

701
	skb_push(skb, skb->data - skb_mac_header(skb));
L
Linus Torvalds 已提交
702 703 704 705 706 707 708 709 710 711 712 713 714 715

	/*
	 *	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.
	 */

E
Eric Dumazet 已提交
716
	if (sock_queue_rcv_skb(sk, skb) == 0)
L
Linus Torvalds 已提交
717 718 719 720 721 722 723 724 725 726 727 728 729
		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
 */
730

L
Linus Torvalds 已提交
731 732 733 734
static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
			       struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
E
Eric Dumazet 已提交
735
	struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name;
736
	struct sk_buff *skb = NULL;
L
Linus Torvalds 已提交
737
	struct net_device *dev;
E
Eric Dumazet 已提交
738
	__be16 proto = 0;
L
Linus Torvalds 已提交
739
	int err;
740

L
Linus Torvalds 已提交
741
	/*
742
	 *	Get and verify the address.
L
Linus Torvalds 已提交
743 744
	 */

E
Eric Dumazet 已提交
745
	if (saddr) {
L
Linus Torvalds 已提交
746
		if (msg->msg_namelen < sizeof(struct sockaddr))
E
Eric Dumazet 已提交
747 748 749 750 751
			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 */
L
Linus Torvalds 已提交
752 753

	/*
754
	 *	Find the device first to size check it
L
Linus Torvalds 已提交
755 756 757
	 */

	saddr->spkt_device[13] = 0;
758
retry:
E
Eric Dumazet 已提交
759 760
	rcu_read_lock();
	dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
L
Linus Torvalds 已提交
761 762 763
	err = -ENODEV;
	if (dev == NULL)
		goto out_unlock;
764

765 766 767 768
	err = -ENETDOWN;
	if (!(dev->flags & IFF_UP))
		goto out_unlock;

L
Linus Torvalds 已提交
769
	/*
E
Eric Dumazet 已提交
770 771
	 * 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.
L
Linus Torvalds 已提交
772
	 */
773

L
Linus Torvalds 已提交
774
	err = -EMSGSIZE;
775
	if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN)
L
Linus Torvalds 已提交
776 777
		goto out_unlock;

778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803
	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;
L
Linus Torvalds 已提交
804 805
	}

806 807 808 809 810 811 812 813 814 815 816 817 818
	if (len > (dev->mtu + dev->hard_header_len)) {
		/* Earlier code assumed this would be a VLAN pkt,
		 * double-check this now that we have the actual
		 * packet in hand.
		 */
		struct ethhdr *ehdr;
		skb_reset_mac_header(skb);
		ehdr = eth_hdr(skb);
		if (ehdr->h_proto != htons(ETH_P_8021Q)) {
			err = -EMSGSIZE;
			goto out_unlock;
		}
	}
819

L
Linus Torvalds 已提交
820 821 822
	skb->protocol = proto;
	skb->dev = dev;
	skb->priority = sk->sk_priority;
823
	skb->mark = sk->sk_mark;
824
	err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
825 826
	if (err < 0)
		goto out_unlock;
L
Linus Torvalds 已提交
827 828

	dev_queue_xmit(skb);
E
Eric Dumazet 已提交
829
	rcu_read_unlock();
E
Eric Dumazet 已提交
830
	return len;
L
Linus Torvalds 已提交
831 832

out_unlock:
E
Eric Dumazet 已提交
833
	rcu_read_unlock();
834 835
out_free:
	kfree_skb(skb);
L
Linus Torvalds 已提交
836 837 838
	return err;
}

E
Eric Dumazet 已提交
839 840
static inline unsigned int run_filter(const struct sk_buff *skb,
				      const struct sock *sk,
D
David S. Miller 已提交
841
				      unsigned int res)
L
Linus Torvalds 已提交
842 843
{
	struct sk_filter *filter;
844

845 846
	rcu_read_lock();
	filter = rcu_dereference(sk->sk_filter);
D
David S. Miller 已提交
847
	if (filter != NULL)
848
		res = SK_RUN_FILTER(filter, skb);
849
	rcu_read_unlock();
L
Linus Torvalds 已提交
850

D
David S. Miller 已提交
851
	return res;
L
Linus Torvalds 已提交
852 853 854
}

/*
E
Eric Dumazet 已提交
855 856 857 858 859 860 861 862 863
 * 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.
L
Linus Torvalds 已提交
864 865
 */

E
Eric Dumazet 已提交
866 867
static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
		      struct packet_type *pt, struct net_device *orig_dev)
L
Linus Torvalds 已提交
868 869 870 871
{
	struct sock *sk;
	struct sockaddr_ll *sll;
	struct packet_sock *po;
E
Eric Dumazet 已提交
872
	u8 *skb_head = skb->data;
L
Linus Torvalds 已提交
873
	int skb_len = skb->len;
D
David S. Miller 已提交
874
	unsigned int snaplen, res;
L
Linus Torvalds 已提交
875 876 877 878 879 880 881

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

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

O
Octavian Purdila 已提交
882
	if (!net_eq(dev_net(dev), sock_net(sk)))
883 884
		goto drop;

L
Linus Torvalds 已提交
885 886
	skb->dev = dev;

887
	if (dev->header_ops) {
L
Linus Torvalds 已提交
888
		/* The device has an explicit notion of ll header,
E
Eric Dumazet 已提交
889 890 891 892 893
		 * exported to higher levels.
		 *
		 * Otherwise, the device hides details of its frame
		 * structure, so that corresponding packet head is
		 * never delivered to user.
L
Linus Torvalds 已提交
894 895
		 */
		if (sk->sk_type != SOCK_DGRAM)
896
			skb_push(skb, skb->data - skb_mac_header(skb));
L
Linus Torvalds 已提交
897 898
		else if (skb->pkt_type == PACKET_OUTGOING) {
			/* Special case: outgoing packets have ll header at head */
899
			skb_pull(skb, skb_network_offset(skb));
L
Linus Torvalds 已提交
900 901 902 903 904
		}
	}

	snaplen = skb->len;

D
David S. Miller 已提交
905 906
	res = run_filter(skb, sk, snaplen);
	if (!res)
907
		goto drop_n_restore;
D
David S. Miller 已提交
908 909
	if (snaplen > res)
		snaplen = res;
L
Linus Torvalds 已提交
910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927

	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;
	}

928 929 930 931
	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
932 933 934 935
	sll->sll_family = AF_PACKET;
	sll->sll_hatype = dev->type;
	sll->sll_protocol = skb->protocol;
	sll->sll_pkttype = skb->pkt_type;
936
	if (unlikely(po->origdev))
937 938 939
		sll->sll_ifindex = orig_dev->ifindex;
	else
		sll->sll_ifindex = dev->ifindex;
L
Linus Torvalds 已提交
940

S
Stephen Hemminger 已提交
941
	sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
L
Linus Torvalds 已提交
942

943
	PACKET_SKB_CB(skb)->origlen = skb->len;
944

L
Linus Torvalds 已提交
945 946 947 948 949
	if (pskb_trim(skb, snaplen))
		goto drop_n_acct;

	skb_set_owner_r(skb, sk);
	skb->dev = NULL;
E
Eric Dumazet 已提交
950
	skb_dst_drop(skb);
L
Linus Torvalds 已提交
951

952 953 954
	/* drop conntrack reference */
	nf_reset(skb);

L
Linus Torvalds 已提交
955 956
	spin_lock(&sk->sk_receive_queue.lock);
	po->stats.tp_packets++;
957
	skb->dropcount = atomic_read(&sk->sk_drops);
L
Linus Torvalds 已提交
958 959 960 961 962 963
	__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:
964
	po->stats.tp_drops = atomic_inc_return(&sk->sk_drops);
L
Linus Torvalds 已提交
965 966 967 968 969 970 971

drop_n_restore:
	if (skb_head != skb->data && skb_shared(skb)) {
		skb->data = skb_head;
		skb->len = skb_len;
	}
drop:
972
	consume_skb(skb);
L
Linus Torvalds 已提交
973 974 975
	return 0;
}

E
Eric Dumazet 已提交
976 977
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
978 979 980 981
{
	struct sock *sk;
	struct packet_sock *po;
	struct sockaddr_ll *sll;
982 983 984 985 986
	union {
		struct tpacket_hdr *h1;
		struct tpacket2_hdr *h2;
		void *raw;
	} h;
E
Eric Dumazet 已提交
987
	u8 *skb_head = skb->data;
L
Linus Torvalds 已提交
988
	int skb_len = skb->len;
D
David S. Miller 已提交
989
	unsigned int snaplen, res;
L
Linus Torvalds 已提交
990
	unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
991
	unsigned short macoff, netoff, hdrlen;
L
Linus Torvalds 已提交
992
	struct sk_buff *copy_skb = NULL;
993
	struct timeval tv;
994
	struct timespec ts;
995
	struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
L
Linus Torvalds 已提交
996 997 998 999 1000 1001 1002

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

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

O
Octavian Purdila 已提交
1003
	if (!net_eq(dev_net(dev), sock_net(sk)))
1004 1005
		goto drop;

1006
	if (dev->header_ops) {
L
Linus Torvalds 已提交
1007
		if (sk->sk_type != SOCK_DGRAM)
1008
			skb_push(skb, skb->data - skb_mac_header(skb));
L
Linus Torvalds 已提交
1009 1010
		else if (skb->pkt_type == PACKET_OUTGOING) {
			/* Special case: outgoing packets have ll header at head */
1011
			skb_pull(skb, skb_network_offset(skb));
L
Linus Torvalds 已提交
1012 1013 1014
		}
	}

1015 1016 1017
	if (skb->ip_summed == CHECKSUM_PARTIAL)
		status |= TP_STATUS_CSUMNOTREADY;

L
Linus Torvalds 已提交
1018 1019
	snaplen = skb->len;

D
David S. Miller 已提交
1020 1021
	res = run_filter(skb, sk, snaplen);
	if (!res)
1022
		goto drop_n_restore;
D
David S. Miller 已提交
1023 1024
	if (snaplen > res)
		snaplen = res;
L
Linus Torvalds 已提交
1025 1026

	if (sk->sk_type == SOCK_DGRAM) {
1027 1028
		macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
				  po->tp_reserve;
L
Linus Torvalds 已提交
1029
	} else {
1030
		unsigned maclen = skb_network_offset(skb);
1031
		netoff = TPACKET_ALIGN(po->tp_hdrlen +
1032 1033
				       (maclen < 16 ? 16 : maclen)) +
			po->tp_reserve;
L
Linus Torvalds 已提交
1034 1035 1036
		macoff = netoff - maclen;
	}

J
Johann Baudy 已提交
1037
	if (macoff + snaplen > po->rx_ring.frame_size) {
L
Linus Torvalds 已提交
1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049
		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
1050
		snaplen = po->rx_ring.frame_size - macoff;
L
Linus Torvalds 已提交
1051 1052 1053 1054 1055
		if ((int)snaplen < 0)
			snaplen = 0;
	}

	spin_lock(&sk->sk_receive_queue.lock);
J
Johann Baudy 已提交
1056
	h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL);
1057
	if (!h.raw)
L
Linus Torvalds 已提交
1058
		goto ring_is_full;
J
Johann Baudy 已提交
1059
	packet_increment_head(&po->rx_ring);
L
Linus Torvalds 已提交
1060 1061 1062 1063 1064 1065 1066 1067 1068
	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);

1069
	skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
L
Linus Torvalds 已提交
1070

1071 1072 1073 1074 1075 1076
	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;
1077 1078 1079 1080 1081 1082 1083
		if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
				&& shhwtstamps->syststamp.tv64)
			tv = ktime_to_timeval(shhwtstamps->syststamp);
		else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
				&& shhwtstamps->hwtstamp.tv64)
			tv = ktime_to_timeval(shhwtstamps->hwtstamp);
		else if (skb->tstamp.tv64)
1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095
			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;
1096 1097 1098 1099 1100 1101 1102
		if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
				&& shhwtstamps->syststamp.tv64)
			ts = ktime_to_timespec(shhwtstamps->syststamp);
		else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
				&& shhwtstamps->hwtstamp.tv64)
			ts = ktime_to_timespec(shhwtstamps->hwtstamp);
		else if (skb->tstamp.tv64)
1103 1104 1105 1106 1107
			ts = ktime_to_timespec(skb->tstamp);
		else
			getnstimeofday(&ts);
		h.h2->tp_sec = ts.tv_sec;
		h.h2->tp_nsec = ts.tv_nsec;
1108 1109 1110 1111 1112 1113
		if (vlan_tx_tag_present(skb)) {
			h.h2->tp_vlan_tci = vlan_tx_tag_get(skb);
			status |= TP_STATUS_VLAN_VALID;
		} else {
			h.h2->tp_vlan_tci = 0;
		}
1114
		h.h2->tp_padding = 0;
1115 1116 1117 1118 1119
		hdrlen = sizeof(*h.h2);
		break;
	default:
		BUG();
	}
L
Linus Torvalds 已提交
1120

1121
	sll = h.raw + TPACKET_ALIGN(hdrlen);
S
Stephen Hemminger 已提交
1122
	sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
L
Linus Torvalds 已提交
1123 1124 1125 1126
	sll->sll_family = AF_PACKET;
	sll->sll_hatype = dev->type;
	sll->sll_protocol = skb->protocol;
	sll->sll_pkttype = skb->pkt_type;
1127
	if (unlikely(po->origdev))
1128 1129 1130
		sll->sll_ifindex = orig_dev->ifindex;
	else
		sll->sll_ifindex = dev->ifindex;
L
Linus Torvalds 已提交
1131

R
Ralf Baechle 已提交
1132
	smp_mb();
1133
#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
L
Linus Torvalds 已提交
1134
	{
1135 1136 1137 1138 1139
		u8 *start, *end;

		end = (u8 *)PAGE_ALIGN((unsigned long)h.raw + macoff + snaplen);
		for (start = h.raw; start < end; start += PAGE_SIZE)
			flush_dcache_page(pgv_to_page(start));
1140
		smp_wmb();
L
Linus Torvalds 已提交
1141
	}
1142
#endif
1143
	__packet_set_status(po, h.raw, status);
L
Linus Torvalds 已提交
1144 1145 1146 1147 1148 1149 1150 1151 1152

	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:
1153
	kfree_skb(skb);
L
Linus Torvalds 已提交
1154 1155 1156 1157 1158 1159 1160
	return 0;

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

	sk->sk_data_ready(sk, 0);
1161
	kfree_skb(copy_skb);
L
Linus Torvalds 已提交
1162 1163 1164
	goto drop_n_restore;
}

J
Johann Baudy 已提交
1165 1166 1167
static void tpacket_destruct_skb(struct sk_buff *skb)
{
	struct packet_sock *po = pkt_sk(skb->sk);
E
Eric Dumazet 已提交
1168
	void *ph;
L
Linus Torvalds 已提交
1169

J
Johann Baudy 已提交
1170
	BUG_ON(skb == NULL);
L
Linus Torvalds 已提交
1171

J
Johann Baudy 已提交
1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182
	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
1183 1184 1185
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
1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202
{
	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;
1203
	skb->mark = po->sk.sk_mark;
J
Johann Baudy 已提交
1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214
	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
1215
		pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
J
Johann Baudy 已提交
1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229
		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
1230
	} else if (dev->hard_header_len) {
J
Johann Baudy 已提交
1231 1232
		/* net device doesn't like empty head */
		if (unlikely(tp_len <= dev->hard_header_len)) {
E
Eric Dumazet 已提交
1233 1234
			pr_err("packet size is too short (%d < %d)\n",
			       tp_len, dev->hard_header_len);
J
Johann Baudy 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
			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;
	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
1262 1263
			pr_err("Packet exceed the number of skb frags(%lu)\n",
			       MAX_SKB_FRAGS);
J
Johann Baudy 已提交
1264 1265 1266
			return -EFAULT;
		}

1267 1268
		page = pgv_to_page(data);
		data += len;
J
Johann Baudy 已提交
1269 1270
		flush_dcache_page(page);
		get_page(page);
1271
		skb_fill_page_desc(skb, nr_frags, page, offset, len);
J
Johann Baudy 已提交
1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285
		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 sk_buff *skb;
	struct net_device *dev;
	__be16 proto;
1286 1287
	bool need_rls_dev = false;
	int err, reserve = 0;
E
Eric Dumazet 已提交
1288 1289
	void *ph;
	struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
J
Johann Baudy 已提交
1290 1291 1292 1293 1294 1295 1296 1297 1298
	int tp_len, size_max;
	unsigned char *addr;
	int len_sum = 0;
	int status = 0;

	mutex_lock(&po->pg_vec_lock);

	err = -EBUSY;
	if (saddr == NULL) {
1299
		dev = po->prot_hook.dev;
J
Johann Baudy 已提交
1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311
		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;
		proto	= saddr->sll_protocol;
		addr	= saddr->sll_addr;
1312 1313
		dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
		need_rls_dev = true;
J
Johann Baudy 已提交
1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326
	}

	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
1327
		- (po->tp_hdrlen - sizeof(struct sockaddr_ll));
J
Johann Baudy 已提交
1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372

	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);
1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386
		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
1387 1388
		packet_increment_head(&po->tx_ring);
		len_sum += tp_len;
1389 1390 1391 1392
	} while (likely((ph != NULL) ||
			((!(msg->msg_flags & MSG_DONTWAIT)) &&
			 (atomic_read(&po->tx_ring.pending))))
		);
J
Johann Baudy 已提交
1393 1394 1395 1396 1397 1398 1399 1400

	err = len_sum;
	goto out_put;

out_status:
	__packet_set_status(po, ph, status);
	kfree_skb(skb);
out_put:
1401 1402
	if (need_rls_dev)
		dev_put(dev);
J
Johann Baudy 已提交
1403 1404 1405 1406 1407
out:
	mutex_unlock(&po->pg_vec_lock);
	return err;
}

1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431
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
1432
static int packet_snd(struct socket *sock,
L
Linus Torvalds 已提交
1433 1434 1435
			  struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
E
Eric Dumazet 已提交
1436
	struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
L
Linus Torvalds 已提交
1437 1438
	struct sk_buff *skb;
	struct net_device *dev;
A
Al Viro 已提交
1439
	__be16 proto;
1440
	bool need_rls_dev = false;
L
Linus Torvalds 已提交
1441
	unsigned char *addr;
1442
	int err, reserve = 0;
1443 1444 1445 1446 1447
	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
1448 1449

	/*
1450
	 *	Get and verify the address.
L
Linus Torvalds 已提交
1451
	 */
1452

L
Linus Torvalds 已提交
1453
	if (saddr == NULL) {
1454
		dev = po->prot_hook.dev;
L
Linus Torvalds 已提交
1455 1456 1457 1458 1459 1460
		proto	= po->num;
		addr	= NULL;
	} else {
		err = -EINVAL;
		if (msg->msg_namelen < sizeof(struct sockaddr_ll))
			goto out;
1461 1462
		if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
			goto out;
L
Linus Torvalds 已提交
1463 1464
		proto	= saddr->sll_protocol;
		addr	= saddr->sll_addr;
1465 1466
		dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
		need_rls_dev = true;
L
Linus Torvalds 已提交
1467 1468 1469 1470 1471 1472 1473 1474
	}

	err = -ENXIO;
	if (dev == NULL)
		goto out_unlock;
	if (sock->type == SOCK_RAW)
		reserve = dev->hard_header_len;

1475 1476 1477 1478
	err = -ENETDOWN;
	if (!(dev->flags & IFF_UP))
		goto out_unlock;

1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526
	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
1527
	err = -EMSGSIZE;
1528
	if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN))
L
Linus Torvalds 已提交
1529 1530
		goto out_unlock;

1531 1532 1533 1534
	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
1535
	if (skb == NULL)
L
Linus Torvalds 已提交
1536 1537
		goto out_unlock;

1538
	skb_set_network_header(skb, reserve);
L
Linus Torvalds 已提交
1539

1540 1541
	err = -EINVAL;
	if (sock->type == SOCK_DGRAM &&
1542
	    (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0)
1543
		goto out_free;
L
Linus Torvalds 已提交
1544 1545

	/* Returns -EFAULT on error */
1546
	err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len);
L
Linus Torvalds 已提交
1547 1548
	if (err)
		goto out_free;
1549
	err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
1550 1551
	if (err < 0)
		goto out_free;
L
Linus Torvalds 已提交
1552

1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566
	if (!gso_type && (len > dev->mtu + reserve)) {
		/* Earlier code assumed this would be a VLAN pkt,
		 * double-check this now that we have the actual
		 * packet in hand.
		 */
		struct ethhdr *ehdr;
		skb_reset_mac_header(skb);
		ehdr = eth_hdr(skb);
		if (ehdr->h_proto != htons(ETH_P_8021Q)) {
			err = -EMSGSIZE;
			goto out_free;
		}
	}

L
Linus Torvalds 已提交
1567 1568 1569
	skb->protocol = proto;
	skb->dev = dev;
	skb->priority = sk->sk_priority;
1570
	skb->mark = sk->sk_mark;
L
Linus Torvalds 已提交
1571

1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590
	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
1591 1592 1593 1594 1595 1596 1597 1598
	/*
	 *	Now send it
	 */

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

1599 1600
	if (need_rls_dev)
		dev_put(dev);
L
Linus Torvalds 已提交
1601

E
Eric Dumazet 已提交
1602
	return len;
L
Linus Torvalds 已提交
1603 1604 1605 1606

out_free:
	kfree_skb(skb);
out_unlock:
1607
	if (dev && need_rls_dev)
L
Linus Torvalds 已提交
1608 1609 1610 1611 1612
		dev_put(dev);
out:
	return err;
}

J
Johann Baudy 已提交
1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623
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
1624 1625 1626 1627 1628 1629 1630 1631 1632
/*
 *	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;
1633
	struct net *net;
J
Johann Baudy 已提交
1634
	struct tpacket_req req;
L
Linus Torvalds 已提交
1635 1636 1637 1638

	if (!sk)
		return 0;

1639
	net = sock_net(sk);
L
Linus Torvalds 已提交
1640 1641
	po = pkt_sk(sk);

1642 1643
	spin_lock_bh(&net->packet.sklist_lock);
	sk_del_node_init_rcu(sk);
1644
	sock_prot_inuse_add(net, sk->sk_prot, -1);
1645
	spin_unlock_bh(&net->packet.sklist_lock);
L
Linus Torvalds 已提交
1646

1647
	spin_lock(&po->bind_lock);
1648
	unregister_prot_hook(sk, false);
1649 1650 1651 1652
	if (po->prot_hook.dev) {
		dev_put(po->prot_hook.dev);
		po->prot_hook.dev = NULL;
	}
1653
	spin_unlock(&po->bind_lock);
L
Linus Torvalds 已提交
1654 1655 1656

	packet_flush_mclist(sk);

J
Johann Baudy 已提交
1657 1658 1659 1660 1661 1662 1663
	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
1664

D
David S. Miller 已提交
1665 1666
	fanout_release(sk);

1667
	synchronize_net();
L
Linus Torvalds 已提交
1668 1669 1670 1671 1672 1673 1674 1675 1676
	/*
	 *	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);
1677
	sk_refcnt_debug_release(sk);
L
Linus Torvalds 已提交
1678 1679 1680 1681 1682 1683 1684 1685 1686

	sock_put(sk);
	return 0;
}

/*
 *	Attach a packet hook.
 */

A
Al Viro 已提交
1687
static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
L
Linus Torvalds 已提交
1688 1689
{
	struct packet_sock *po = pkt_sk(sk);
D
David S. Miller 已提交
1690 1691 1692

	if (po->fanout)
		return -EINVAL;
L
Linus Torvalds 已提交
1693 1694 1695 1696

	lock_sock(sk);

	spin_lock(&po->bind_lock);
1697
	unregister_prot_hook(sk, true);
L
Linus Torvalds 已提交
1698 1699
	po->num = protocol;
	po->prot_hook.type = protocol;
1700 1701
	if (po->prot_hook.dev)
		dev_put(po->prot_hook.dev);
L
Linus Torvalds 已提交
1702 1703 1704 1705 1706 1707 1708
	po->prot_hook.dev = dev;

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

	if (protocol == 0)
		goto out_unlock;

1709
	if (!dev || (dev->flags & IFF_UP)) {
1710
		register_prot_hook(sk);
1711 1712 1713 1714
	} else {
		sk->sk_err = ENETDOWN;
		if (!sock_flag(sk, SOCK_DEAD))
			sk->sk_error_report(sk);
L
Linus Torvalds 已提交
1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726
	}

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
1727 1728
static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
			    int addr_len)
L
Linus Torvalds 已提交
1729
{
E
Eric Dumazet 已提交
1730
	struct sock *sk = sock->sk;
L
Linus Torvalds 已提交
1731 1732 1733
	char name[15];
	struct net_device *dev;
	int err = -ENODEV;
1734

L
Linus Torvalds 已提交
1735 1736 1737
	/*
	 *	Check legality
	 */
1738

1739
	if (addr_len != sizeof(struct sockaddr))
L
Linus Torvalds 已提交
1740
		return -EINVAL;
E
Eric Dumazet 已提交
1741
	strlcpy(name, uaddr->sa_data, sizeof(name));
L
Linus Torvalds 已提交
1742

1743
	dev = dev_get_by_name(sock_net(sk), name);
1744
	if (dev)
L
Linus Torvalds 已提交
1745 1746 1747 1748 1749 1750
		err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
	return err;
}

static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
E
Eric Dumazet 已提交
1751 1752
	struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
	struct sock *sk = sock->sk;
L
Linus Torvalds 已提交
1753 1754 1755 1756 1757 1758 1759
	struct net_device *dev = NULL;
	int err;


	/*
	 *	Check legality
	 */
1760

L
Linus Torvalds 已提交
1761 1762 1763 1764 1765 1766 1767
	if (addr_len < sizeof(struct sockaddr_ll))
		return -EINVAL;
	if (sll->sll_family != AF_PACKET)
		return -EINVAL;

	if (sll->sll_ifindex) {
		err = -ENODEV;
1768
		dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
L
Linus Torvalds 已提交
1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784
		if (dev == NULL)
			goto out;
	}
	err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);

out:
	return err;
}

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

/*
1785
 *	Create a packet of type SOCK_PACKET.
L
Linus Torvalds 已提交
1786 1787
 */

1788 1789
static int packet_create(struct net *net, struct socket *sock, int protocol,
			 int kern)
L
Linus Torvalds 已提交
1790 1791 1792
{
	struct sock *sk;
	struct packet_sock *po;
A
Al Viro 已提交
1793
	__be16 proto = (__force __be16)protocol; /* weird, but documented */
L
Linus Torvalds 已提交
1794 1795 1796 1797
	int err;

	if (!capable(CAP_NET_RAW))
		return -EPERM;
1798 1799
	if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
	    sock->type != SOCK_PACKET)
L
Linus Torvalds 已提交
1800 1801 1802 1803 1804
		return -ESOCKTNOSUPPORT;

	sock->state = SS_UNCONNECTED;

	err = -ENOBUFS;
1805
	sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
L
Linus Torvalds 已提交
1806 1807 1808 1809 1810 1811
	if (sk == NULL)
		goto out;

	sock->ops = &packet_ops;
	if (sock->type == SOCK_PACKET)
		sock->ops = &packet_ops_spkt;
1812

L
Linus Torvalds 已提交
1813 1814 1815 1816
	sock_init_data(sock, sk);

	po = pkt_sk(sk);
	sk->sk_family = PF_PACKET;
A
Al Viro 已提交
1817
	po->num = proto;
L
Linus Torvalds 已提交
1818 1819

	sk->sk_destruct = packet_sock_destruct;
1820
	sk_refcnt_debug_inc(sk);
L
Linus Torvalds 已提交
1821 1822 1823 1824 1825 1826

	/*
	 *	Attach a protocol block
	 */

	spin_lock_init(&po->bind_lock);
1827
	mutex_init(&po->pg_vec_lock);
L
Linus Torvalds 已提交
1828
	po->prot_hook.func = packet_rcv;
1829

L
Linus Torvalds 已提交
1830 1831
	if (sock->type == SOCK_PACKET)
		po->prot_hook.func = packet_rcv_spkt;
1832

L
Linus Torvalds 已提交
1833 1834
	po->prot_hook.af_packet_priv = sk;

A
Al Viro 已提交
1835 1836
	if (proto) {
		po->prot_hook.type = proto;
1837
		register_prot_hook(sk);
L
Linus Torvalds 已提交
1838 1839
	}

1840 1841
	spin_lock_bh(&net->packet.sklist_lock);
	sk_add_node_rcu(sk, &net->packet.sklist);
1842
	sock_prot_inuse_add(net, &packet_proto, 1);
1843 1844
	spin_unlock_bh(&net->packet.sklist_lock);

E
Eric Dumazet 已提交
1845
	return 0;
L
Linus Torvalds 已提交
1846 1847 1848 1849
out:
	return err;
}

1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894
static int packet_recv_error(struct sock *sk, struct msghdr *msg, int len)
{
	struct sock_exterr_skb *serr;
	struct sk_buff *skb, *skb2;
	int copied, err;

	err = -EAGAIN;
	skb = skb_dequeue(&sk->sk_error_queue);
	if (skb == NULL)
		goto out;

	copied = skb->len;
	if (copied > len) {
		msg->msg_flags |= MSG_TRUNC;
		copied = len;
	}
	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
	if (err)
		goto out_free_skb;

	sock_recv_timestamp(msg, sk, skb);

	serr = SKB_EXT_ERR(skb);
	put_cmsg(msg, SOL_PACKET, PACKET_TX_TIMESTAMP,
		 sizeof(serr->ee), &serr->ee);

	msg->msg_flags |= MSG_ERRQUEUE;
	err = copied;

	/* Reset and regenerate socket error */
	spin_lock_bh(&sk->sk_error_queue.lock);
	sk->sk_err = 0;
	if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
		sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
		spin_unlock_bh(&sk->sk_error_queue.lock);
		sk->sk_error_report(sk);
	} else
		spin_unlock_bh(&sk->sk_error_queue.lock);

out_free_skb:
	kfree_skb(skb);
out:
	return err;
}

L
Linus Torvalds 已提交
1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905
/*
 *	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;
1906
	struct sockaddr_ll *sll;
1907
	int vnet_hdr_len = 0;
L
Linus Torvalds 已提交
1908 1909

	err = -EINVAL;
1910
	if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
L
Linus Torvalds 已提交
1911 1912 1913 1914 1915 1916 1917 1918
		goto out;

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

1919 1920 1921 1922 1923
	if (flags & MSG_ERRQUEUE) {
		err = packet_recv_error(sk, msg, len);
		goto out;
	}

L
Linus Torvalds 已提交
1924 1925 1926 1927 1928 1929 1930 1931 1932
	/*
	 *	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
1933
	skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
L
Linus Torvalds 已提交
1934 1935

	/*
1936
	 *	An error occurred so return it. Because skb_recv_datagram()
L
Linus Torvalds 已提交
1937 1938 1939 1940
	 *	handles the blocking we don't see and worry about blocking
	 *	retries.
	 */

1941
	if (skb == NULL)
L
Linus Torvalds 已提交
1942 1943
		goto out;

1944 1945 1946 1947 1948
	if (pkt_sk(sk)->has_vnet_hdr) {
		struct virtio_net_hdr vnet_hdr = { 0 };

		err = -EINVAL;
		vnet_hdr_len = sizeof(vnet_hdr);
1949
		if (len < vnet_hdr_len)
1950 1951
			goto out_free;

1952 1953
		len -= vnet_hdr_len;

1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976
		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;
1977
			vnet_hdr.csum_start = skb_checksum_start_offset(skb);
1978
			vnet_hdr.csum_offset = skb->csum_offset;
1979 1980
		} else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
			vnet_hdr.flags = VIRTIO_NET_HDR_F_DATA_VALID;
1981 1982 1983 1984 1985 1986 1987 1988
		} /* else everything is zero */

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

1989 1990 1991 1992 1993
	/*
	 *	If the address length field is there to be filled in, we fill
	 *	it in now.
	 */

1994
	sll = &PACKET_SKB_CB(skb)->sa.ll;
1995 1996 1997 1998 1999
	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
2000 2001 2002 2003 2004 2005
	/*
	 *	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
2006 2007 2008
	if (copied > len) {
		copied = len;
		msg->msg_flags |= MSG_TRUNC;
L
Linus Torvalds 已提交
2009 2010 2011 2012 2013 2014
	}

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

2015
	sock_recv_ts_and_drops(msg, sk, skb);
L
Linus Torvalds 已提交
2016 2017

	if (msg->msg_name)
2018 2019
		memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
		       msg->msg_namelen);
L
Linus Torvalds 已提交
2020

2021
	if (pkt_sk(sk)->auxdata) {
2022 2023 2024 2025 2026 2027 2028 2029
		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;
2030
		aux.tp_net = skb_network_offset(skb);
2031 2032 2033 2034 2035 2036
		if (vlan_tx_tag_present(skb)) {
			aux.tp_vlan_tci = vlan_tx_tag_get(skb);
			aux.tp_status |= TP_STATUS_VLAN_VALID;
		} else {
			aux.tp_vlan_tci = 0;
		}
2037
		aux.tp_padding = 0;
2038
		put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
2039 2040
	}

L
Linus Torvalds 已提交
2041 2042 2043 2044
	/*
	 *	Free or return the buffer as appropriate. Again this
	 *	hides all the races and re-entrancy issues from us.
	 */
2045
	err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
L
Linus Torvalds 已提交
2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062

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
2063 2064 2065
	rcu_read_lock();
	dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
	if (dev)
2066
		strncpy(uaddr->sa_data, dev->name, 14);
E
Eric Dumazet 已提交
2067
	else
L
Linus Torvalds 已提交
2068
		memset(uaddr->sa_data, 0, 14);
E
Eric Dumazet 已提交
2069
	rcu_read_unlock();
L
Linus Torvalds 已提交
2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080
	*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);
2081
	DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
L
Linus Torvalds 已提交
2082 2083 2084 2085 2086 2087 2088

	if (peer)
		return -EOPNOTSUPP;

	sll->sll_family = AF_PACKET;
	sll->sll_ifindex = po->ifindex;
	sll->sll_protocol = po->num;
2089
	sll->sll_pkttype = 0;
E
Eric Dumazet 已提交
2090 2091
	rcu_read_lock();
	dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
L
Linus Torvalds 已提交
2092 2093 2094 2095 2096 2097 2098 2099
	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
2100
	rcu_read_unlock();
2101
	*uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
L
Linus Torvalds 已提交
2102 2103 2104 2105

	return 0;
}

2106 2107
static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
			 int what)
L
Linus Torvalds 已提交
2108 2109 2110
{
	switch (i->type) {
	case PACKET_MR_MULTICAST:
2111 2112
		if (i->alen != dev->addr_len)
			return -EINVAL;
L
Linus Torvalds 已提交
2113
		if (what > 0)
2114
			return dev_mc_add(dev, i->addr);
L
Linus Torvalds 已提交
2115
		else
2116
			return dev_mc_del(dev, i->addr);
L
Linus Torvalds 已提交
2117 2118
		break;
	case PACKET_MR_PROMISC:
2119
		return dev_set_promiscuity(dev, what);
L
Linus Torvalds 已提交
2120 2121
		break;
	case PACKET_MR_ALLMULTI:
2122
		return dev_set_allmulti(dev, what);
L
Linus Torvalds 已提交
2123
		break;
2124
	case PACKET_MR_UNICAST:
2125 2126
		if (i->alen != dev->addr_len)
			return -EINVAL;
2127
		if (what > 0)
2128
			return dev_uc_add(dev, i->addr);
2129
		else
2130
			return dev_uc_del(dev, i->addr);
2131
		break;
E
Eric Dumazet 已提交
2132 2133
	default:
		break;
L
Linus Torvalds 已提交
2134
	}
2135
	return 0;
L
Linus Torvalds 已提交
2136 2137 2138 2139
}

static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
{
E
Eric Dumazet 已提交
2140
	for ( ; i; i = i->next) {
L
Linus Torvalds 已提交
2141 2142 2143 2144 2145
		if (i->ifindex == dev->ifindex)
			packet_dev_mc(dev, i, what);
	}
}

2146
static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
L
Linus Torvalds 已提交
2147 2148 2149 2150 2151 2152 2153 2154 2155
{
	struct packet_sock *po = pkt_sk(sk);
	struct packet_mclist *ml, *i;
	struct net_device *dev;
	int err;

	rtnl_lock();

	err = -ENODEV;
2156
	dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
L
Linus Torvalds 已提交
2157 2158 2159 2160
	if (!dev)
		goto done;

	err = -EINVAL;
2161
	if (mreq->mr_alen > dev->addr_len)
L
Linus Torvalds 已提交
2162 2163 2164
		goto done;

	err = -ENOBUFS;
2165
	i = kmalloc(sizeof(*i), GFP_KERNEL);
L
Linus Torvalds 已提交
2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188
	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;
2189 2190 2191 2192 2193
	err = packet_dev_mc(dev, i, 1);
	if (err) {
		po->mclist = i->next;
		kfree(i);
	}
L
Linus Torvalds 已提交
2194 2195 2196 2197 2198 2199

done:
	rtnl_unlock();
	return err;
}

2200
static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
L
Linus Torvalds 已提交
2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213
{
	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;
2214 2215
				dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
				if (dev)
L
Linus Torvalds 已提交
2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239
					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;
2240 2241
		dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
		if (dev != NULL)
L
Linus Torvalds 已提交
2242 2243 2244 2245 2246 2247 2248
			packet_dev_mc(dev, ml, -1);
		kfree(ml);
	}
	rtnl_unlock();
}

static int
2249
packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
L
Linus Torvalds 已提交
2250 2251
{
	struct sock *sk = sock->sk;
2252
	struct packet_sock *po = pkt_sk(sk);
L
Linus Torvalds 已提交
2253 2254 2255 2256 2257
	int ret;

	if (level != SOL_PACKET)
		return -ENOPROTOOPT;

J
Johann Baudy 已提交
2258
	switch (optname) {
2259
	case PACKET_ADD_MEMBERSHIP:
L
Linus Torvalds 已提交
2260 2261
	case PACKET_DROP_MEMBERSHIP:
	{
2262 2263 2264 2265
		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
2266
			return -EINVAL;
2267 2268
		if (len > sizeof(mreq))
			len = sizeof(mreq);
E
Eric Dumazet 已提交
2269
		if (copy_from_user(&mreq, optval, len))
L
Linus Torvalds 已提交
2270
			return -EFAULT;
2271 2272
		if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
			return -EINVAL;
L
Linus Torvalds 已提交
2273 2274 2275 2276 2277 2278
		if (optname == PACKET_ADD_MEMBERSHIP)
			ret = packet_mc_add(sk, &mreq);
		else
			ret = packet_mc_drop(sk, &mreq);
		return ret;
	}
2279

L
Linus Torvalds 已提交
2280
	case PACKET_RX_RING:
J
Johann Baudy 已提交
2281
	case PACKET_TX_RING:
L
Linus Torvalds 已提交
2282 2283 2284
	{
		struct tpacket_req req;

E
Eric Dumazet 已提交
2285
		if (optlen < sizeof(req))
L
Linus Torvalds 已提交
2286
			return -EINVAL;
2287 2288
		if (pkt_sk(sk)->has_vnet_hdr)
			return -EINVAL;
E
Eric Dumazet 已提交
2289
		if (copy_from_user(&req, optval, sizeof(req)))
L
Linus Torvalds 已提交
2290
			return -EFAULT;
J
Johann Baudy 已提交
2291
		return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING);
L
Linus Torvalds 已提交
2292 2293 2294 2295 2296
	}
	case PACKET_COPY_THRESH:
	{
		int val;

E
Eric Dumazet 已提交
2297
		if (optlen != sizeof(val))
L
Linus Torvalds 已提交
2298
			return -EINVAL;
E
Eric Dumazet 已提交
2299
		if (copy_from_user(&val, optval, sizeof(val)))
L
Linus Torvalds 已提交
2300 2301 2302 2303 2304
			return -EFAULT;

		pkt_sk(sk)->copy_thresh = val;
		return 0;
	}
2305 2306 2307 2308 2309 2310
	case PACKET_VERSION:
	{
		int val;

		if (optlen != sizeof(val))
			return -EINVAL;
J
Johann Baudy 已提交
2311
		if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323
			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;
		}
	}
2324 2325 2326 2327 2328 2329
	case PACKET_RESERVE:
	{
		unsigned int val;

		if (optlen != sizeof(val))
			return -EINVAL;
J
Johann Baudy 已提交
2330
		if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
2331 2332 2333 2334 2335 2336
			return -EBUSY;
		if (copy_from_user(&val, optval, sizeof(val)))
			return -EFAULT;
		po->tp_reserve = val;
		return 0;
	}
J
Johann Baudy 已提交
2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349
	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;
	}
2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361
	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;
	}
2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373
	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;
	}
2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389
	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;
	}
2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401
	case PACKET_TIMESTAMP:
	{
		int val;

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

		po->tp_tstamp = val;
		return 0;
	}
D
David S. Miller 已提交
2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412
	case PACKET_FANOUT:
	{
		int val;

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

		return fanout_add(sk, val & 0xffff, val >> 16);
	}
L
Linus Torvalds 已提交
2413 2414 2415 2416 2417 2418 2419 2420 2421
	default:
		return -ENOPROTOOPT;
	}
}

static int packet_getsockopt(struct socket *sock, int level, int optname,
			     char __user *optval, int __user *optlen)
{
	int len;
2422
	int val;
L
Linus Torvalds 已提交
2423 2424
	struct sock *sk = sock->sk;
	struct packet_sock *po = pkt_sk(sk);
2425 2426
	void *data;
	struct tpacket_stats st;
L
Linus Torvalds 已提交
2427 2428 2429 2430

	if (level != SOL_PACKET)
		return -ENOPROTOOPT;

2431 2432
	if (get_user(len, optlen))
		return -EFAULT;
L
Linus Torvalds 已提交
2433 2434 2435

	if (len < 0)
		return -EINVAL;
2436

J
Johann Baudy 已提交
2437
	switch (optname) {
L
Linus Torvalds 已提交
2438 2439 2440 2441 2442 2443 2444 2445 2446
	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;

2447 2448 2449 2450 2451 2452 2453
		data = &st;
		break;
	case PACKET_AUXDATA:
		if (len > sizeof(int))
			len = sizeof(int);
		val = po->auxdata;

2454 2455 2456 2457 2458 2459 2460
		data = &val;
		break;
	case PACKET_ORIGDEV:
		if (len > sizeof(int))
			len = sizeof(int);
		val = po->origdev;

2461 2462 2463 2464 2465 2466 2467
		data = &val;
		break;
	case PACKET_VNET_HDR:
		if (len > sizeof(int))
			len = sizeof(int);
		val = po->has_vnet_hdr;

2468
		data = &val;
L
Linus Torvalds 已提交
2469
		break;
2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492
	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;
2493 2494 2495 2496 2497 2498
	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
2499 2500 2501 2502 2503 2504
	case PACKET_LOSS:
		if (len > sizeof(unsigned int))
			len = sizeof(unsigned int);
		val = po->tp_loss;
		data = &val;
		break;
2505 2506 2507 2508 2509 2510
	case PACKET_TIMESTAMP:
		if (len > sizeof(int))
			len = sizeof(int);
		val = po->tp_tstamp;
		data = &val;
		break;
D
David S. Miller 已提交
2511 2512 2513 2514 2515 2516 2517 2518 2519
	case PACKET_FANOUT:
		if (len > sizeof(int))
			len = sizeof(int);
		val = (po->fanout ?
		       ((u32)po->fanout->id |
			((u32)po->fanout->type << 16)) :
		       0);
		data = &val;
		break;
L
Linus Torvalds 已提交
2520 2521 2522 2523
	default:
		return -ENOPROTOOPT;
	}

2524 2525
	if (put_user(len, optlen))
		return -EFAULT;
2526 2527
	if (copy_to_user(optval, data, len))
		return -EFAULT;
2528
	return 0;
L
Linus Torvalds 已提交
2529 2530 2531 2532 2533 2534 2535
}


static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
{
	struct sock *sk;
	struct hlist_node *node;
2536
	struct net_device *dev = data;
2537
	struct net *net = dev_net(dev);
L
Linus Torvalds 已提交
2538

2539 2540
	rcu_read_lock();
	sk_for_each_rcu(sk, node, &net->packet.sklist) {
L
Linus Torvalds 已提交
2541 2542 2543 2544 2545 2546
		struct packet_sock *po = pkt_sk(sk);

		switch (msg) {
		case NETDEV_UNREGISTER:
			if (po->mclist)
				packet_dev_mclist(dev, po->mclist, -1);
2547 2548
			/* fallthrough */

L
Linus Torvalds 已提交
2549 2550 2551 2552
		case NETDEV_DOWN:
			if (dev->ifindex == po->ifindex) {
				spin_lock(&po->bind_lock);
				if (po->running) {
2553
					__unregister_prot_hook(sk, false);
L
Linus Torvalds 已提交
2554 2555 2556 2557 2558 2559
					sk->sk_err = ENETDOWN;
					if (!sock_flag(sk, SOCK_DEAD))
						sk->sk_error_report(sk);
				}
				if (msg == NETDEV_UNREGISTER) {
					po->ifindex = -1;
2560 2561
					if (po->prot_hook.dev)
						dev_put(po->prot_hook.dev);
L
Linus Torvalds 已提交
2562 2563 2564 2565 2566 2567
					po->prot_hook.dev = NULL;
				}
				spin_unlock(&po->bind_lock);
			}
			break;
		case NETDEV_UP:
2568 2569
			if (dev->ifindex == po->ifindex) {
				spin_lock(&po->bind_lock);
2570 2571
				if (po->num)
					register_prot_hook(sk);
2572
				spin_unlock(&po->bind_lock);
L
Linus Torvalds 已提交
2573 2574 2575 2576
			}
			break;
		}
	}
2577
	rcu_read_unlock();
L
Linus Torvalds 已提交
2578 2579 2580 2581 2582 2583 2584 2585 2586
	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
2587
	switch (cmd) {
E
Eric Dumazet 已提交
2588 2589 2590
	case SIOCOUTQ:
	{
		int amount = sk_wmem_alloc_get(sk);
2591

E
Eric Dumazet 已提交
2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609
		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);
2610

L
Linus Torvalds 已提交
2611
#ifdef CONFIG_INET
E
Eric Dumazet 已提交
2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626
	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:
		return inet_dgram_ops.ioctl(sock, cmd, arg);
L
Linus Torvalds 已提交
2627 2628
#endif

E
Eric Dumazet 已提交
2629 2630
	default:
		return -ENOIOCTLCMD;
L
Linus Torvalds 已提交
2631 2632 2633 2634
	}
	return 0;
}

E
Eric Dumazet 已提交
2635
static unsigned int packet_poll(struct file *file, struct socket *sock,
L
Linus Torvalds 已提交
2636 2637 2638 2639 2640 2641 2642
				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
2643 2644
	if (po->rx_ring.pg_vec) {
		if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL))
L
Linus Torvalds 已提交
2645 2646 2647
			mask |= POLLIN | POLLRDNORM;
	}
	spin_unlock_bh(&sk->sk_receive_queue.lock);
J
Johann Baudy 已提交
2648 2649 2650 2651 2652 2653
	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
2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664
	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
2665
	struct socket *sock = file->private_data;
L
Linus Torvalds 已提交
2666
	struct sock *sk = sock->sk;
2667

L
Linus Torvalds 已提交
2668 2669 2670 2671 2672 2673 2674
	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
2675
	struct socket *sock = file->private_data;
L
Linus Torvalds 已提交
2676
	struct sock *sk = sock->sk;
2677

L
Linus Torvalds 已提交
2678 2679 2680 2681
	if (sk)
		atomic_dec(&pkt_sk(sk)->mapped);
}

2682
static const struct vm_operations_struct packet_mmap_ops = {
E
Eric Dumazet 已提交
2683 2684
	.open	=	packet_mm_open,
	.close	=	packet_mm_close,
L
Linus Torvalds 已提交
2685 2686
};

2687 2688
static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
			unsigned int len)
L
Linus Torvalds 已提交
2689 2690 2691
{
	int i;

2692
	for (i = 0; i < len; i++) {
2693
		if (likely(pg_vec[i].buffer)) {
C
Changli Gao 已提交
2694
			if (is_vmalloc_addr(pg_vec[i].buffer))
2695 2696 2697 2698 2699 2700
				vfree(pg_vec[i].buffer);
			else
				free_pages((unsigned long)pg_vec[i].buffer,
					   order);
			pg_vec[i].buffer = NULL;
		}
L
Linus Torvalds 已提交
2701 2702 2703 2704
	}
	kfree(pg_vec);
}

C
Changli Gao 已提交
2705
static inline char *alloc_one_pg_vec_page(unsigned long order)
2706
{
2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718
	char *buffer = NULL;
	gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
			  __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;

	buffer = (char *) __get_free_pages(gfp_flags, order);

	if (buffer)
		return buffer;

	/*
	 * __get_free_pages failed, fall back to vmalloc
	 */
E
Eric Dumazet 已提交
2719
	buffer = vzalloc((1 << order) * PAGE_SIZE);
2720

2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735
	if (buffer)
		return buffer;

	/*
	 * vmalloc failed, lets dig into swap here
	 */
	gfp_flags &= ~__GFP_NORETRY;
	buffer = (char *)__get_free_pages(gfp_flags, order);
	if (buffer)
		return buffer;

	/*
	 * complete and utter failure
	 */
	return NULL;
2736 2737
}

2738
static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
2739 2740
{
	unsigned int block_nr = req->tp_block_nr;
2741
	struct pgv *pg_vec;
2742 2743
	int i;

2744
	pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL);
2745 2746 2747 2748
	if (unlikely(!pg_vec))
		goto out;

	for (i = 0; i < block_nr; i++) {
C
Changli Gao 已提交
2749
		pg_vec[i].buffer = alloc_one_pg_vec_page(order);
2750
		if (unlikely(!pg_vec[i].buffer))
2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761
			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
2762

J
Johann Baudy 已提交
2763 2764
static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
		int closing, int tx_ring)
L
Linus Torvalds 已提交
2765
{
2766
	struct pgv *pg_vec = NULL;
L
Linus Torvalds 已提交
2767
	struct packet_sock *po = pkt_sk(sk);
A
Al Viro 已提交
2768
	int was_running, order = 0;
J
Johann Baudy 已提交
2769 2770
	struct packet_ring_buffer *rb;
	struct sk_buff_head *rb_queue;
A
Al Viro 已提交
2771
	__be16 num;
J
Johann Baudy 已提交
2772
	int err;
2773

J
Johann Baudy 已提交
2774 2775
	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
2776

J
Johann Baudy 已提交
2777 2778 2779 2780 2781 2782 2783
	err = -EBUSY;
	if (!closing) {
		if (atomic_read(&po->mapped))
			goto out;
		if (atomic_read(&rb->pending))
			goto out;
	}
L
Linus Torvalds 已提交
2784

J
Johann Baudy 已提交
2785 2786 2787 2788 2789
	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
2790

2791 2792 2793 2794 2795 2796 2797 2798 2799
		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
2800
		err = -EINVAL;
2801
		if (unlikely((int)req->tp_block_size <= 0))
J
Johann Baudy 已提交
2802
			goto out;
2803
		if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
J
Johann Baudy 已提交
2804
			goto out;
2805
		if (unlikely(req->tp_frame_size < po->tp_hdrlen +
J
Johann Baudy 已提交
2806 2807
					po->tp_reserve))
			goto out;
2808
		if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
J
Johann Baudy 已提交
2809
			goto out;
L
Linus Torvalds 已提交
2810

J
Johann Baudy 已提交
2811 2812 2813 2814 2815 2816
		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
2817 2818

		err = -ENOMEM;
2819 2820 2821
		order = get_order(req->tp_block_size);
		pg_vec = alloc_pg_vec(req, order);
		if (unlikely(!pg_vec))
L
Linus Torvalds 已提交
2822
			goto out;
J
Johann Baudy 已提交
2823 2824 2825 2826
	}
	/* Done */
	else {
		err = -EINVAL;
2827
		if (unlikely(req->tp_frame_nr))
J
Johann Baudy 已提交
2828
			goto out;
L
Linus Torvalds 已提交
2829 2830 2831 2832 2833 2834 2835 2836 2837 2838
	}

	lock_sock(sk);

	/* Detach socket from network */
	spin_lock(&po->bind_lock);
	was_running = po->running;
	num = po->num;
	if (was_running) {
		po->num = 0;
2839
		__unregister_prot_hook(sk, false);
L
Linus Torvalds 已提交
2840 2841
	}
	spin_unlock(&po->bind_lock);
2842

L
Linus Torvalds 已提交
2843 2844 2845
	synchronize_net();

	err = -EBUSY;
2846
	mutex_lock(&po->pg_vec_lock);
L
Linus Torvalds 已提交
2847 2848
	if (closing || atomic_read(&po->mapped) == 0) {
		err = 0;
J
Johann Baudy 已提交
2849
		spin_lock_bh(&rb_queue->lock);
2850
		swap(rb->pg_vec, pg_vec);
J
Johann Baudy 已提交
2851 2852 2853 2854 2855
		rb->frame_max = (req->tp_frame_nr - 1);
		rb->head = 0;
		rb->frame_size = req->tp_frame_size;
		spin_unlock_bh(&rb_queue->lock);

2856 2857
		swap(rb->pg_vec_order, order);
		swap(rb->pg_vec_len, req->tp_block_nr);
J
Johann Baudy 已提交
2858 2859 2860 2861 2862

		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
2863
		if (atomic_read(&po->mapped))
E
Eric Dumazet 已提交
2864 2865
			pr_err("packet_mmap: vma is busy: %d\n",
			       atomic_read(&po->mapped));
L
Linus Torvalds 已提交
2866
	}
2867
	mutex_unlock(&po->pg_vec_lock);
L
Linus Torvalds 已提交
2868 2869

	spin_lock(&po->bind_lock);
2870
	if (was_running) {
L
Linus Torvalds 已提交
2871
		po->num = num;
2872
		register_prot_hook(sk);
L
Linus Torvalds 已提交
2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883
	}
	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
2884 2885
static int packet_mmap(struct file *file, struct socket *sock,
		struct vm_area_struct *vma)
L
Linus Torvalds 已提交
2886 2887 2888
{
	struct sock *sk = sock->sk;
	struct packet_sock *po = pkt_sk(sk);
J
Johann Baudy 已提交
2889 2890
	unsigned long size, expected_size;
	struct packet_ring_buffer *rb;
L
Linus Torvalds 已提交
2891 2892 2893 2894 2895 2896 2897
	unsigned long start;
	int err = -EINVAL;
	int i;

	if (vma->vm_pgoff)
		return -EINVAL;

2898
	mutex_lock(&po->pg_vec_lock);
J
Johann Baudy 已提交
2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909

	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
2910
		goto out;
J
Johann Baudy 已提交
2911 2912 2913

	size = vma->vm_end - vma->vm_start;
	if (size != expected_size)
L
Linus Torvalds 已提交
2914 2915 2916
		goto out;

	start = vma->vm_start;
J
Johann Baudy 已提交
2917 2918 2919 2920 2921
	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++) {
2922 2923
			struct page *page;
			void *kaddr = rb->pg_vec[i].buffer;
J
Johann Baudy 已提交
2924 2925
			int pg_num;

C
Changli Gao 已提交
2926 2927
			for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
				page = pgv_to_page(kaddr);
J
Johann Baudy 已提交
2928 2929 2930 2931
				err = vm_insert_page(vma, start, page);
				if (unlikely(err))
					goto out;
				start += PAGE_SIZE;
2932
				kaddr += PAGE_SIZE;
J
Johann Baudy 已提交
2933
			}
2934
		}
L
Linus Torvalds 已提交
2935
	}
J
Johann Baudy 已提交
2936

2937
	atomic_inc(&po->mapped);
L
Linus Torvalds 已提交
2938 2939 2940 2941
	vma->vm_ops = &packet_mmap_ops;
	err = 0;

out:
2942
	mutex_unlock(&po->pg_vec_lock);
L
Linus Torvalds 已提交
2943 2944 2945
	return err;
}

2946
static const struct proto_ops packet_ops_spkt = {
L
Linus Torvalds 已提交
2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966
	.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,
};

2967
static const struct proto_ops packet_ops = {
L
Linus Torvalds 已提交
2968 2969 2970 2971 2972 2973 2974
	.family =	PF_PACKET,
	.owner =	THIS_MODULE,
	.release =	packet_release,
	.bind =		packet_bind,
	.connect =	sock_no_connect,
	.socketpair =	sock_no_socketpair,
	.accept =	sock_no_accept,
2975
	.getname =	packet_getname,
L
Linus Torvalds 已提交
2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987
	.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,
};

2988
static const struct net_proto_family packet_family_ops = {
L
Linus Torvalds 已提交
2989 2990 2991 2992 2993 2994
	.family =	PF_PACKET,
	.create =	packet_create,
	.owner	=	THIS_MODULE,
};

static struct notifier_block packet_netdev_notifier = {
E
Eric Dumazet 已提交
2995
	.notifier_call =	packet_notifier,
L
Linus Torvalds 已提交
2996 2997 2998 2999 3000
};

#ifdef CONFIG_PROC_FS

static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
3001
	__acquires(RCU)
L
Linus Torvalds 已提交
3002
{
3003
	struct net *net = seq_file_net(seq);
3004 3005 3006

	rcu_read_lock();
	return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
L
Linus Torvalds 已提交
3007 3008 3009 3010
}

static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
3011
	struct net *net = seq_file_net(seq);
3012
	return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
L
Linus Torvalds 已提交
3013 3014 3015
}

static void packet_seq_stop(struct seq_file *seq, void *v)
3016
	__releases(RCU)
L
Linus Torvalds 已提交
3017
{
3018
	rcu_read_unlock();
L
Linus Torvalds 已提交
3019 3020
}

3021
static int packet_seq_show(struct seq_file *seq, void *v)
L
Linus Torvalds 已提交
3022 3023 3024 3025
{
	if (v == SEQ_START_TOKEN)
		seq_puts(seq, "sk       RefCnt Type Proto  Iface R Rmem   User   Inode\n");
	else {
3026
		struct sock *s = sk_entry(v);
L
Linus Torvalds 已提交
3027 3028 3029
		const struct packet_sock *po = pkt_sk(s);

		seq_printf(seq,
D
Dan Rosenberg 已提交
3030
			   "%pK %-6d %-4d %04x   %-5d %1d %-6u %-6u %-6lu\n",
L
Linus Torvalds 已提交
3031 3032 3033 3034 3035 3036 3037 3038
			   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
3039
			   sock_i_ino(s));
L
Linus Torvalds 已提交
3040 3041 3042 3043 3044
	}

	return 0;
}

3045
static const struct seq_operations packet_seq_ops = {
L
Linus Torvalds 已提交
3046 3047 3048 3049 3050 3051 3052 3053
	.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)
{
3054 3055
	return seq_open_net(inode, file, &packet_seq_ops,
			    sizeof(struct seq_net_private));
L
Linus Torvalds 已提交
3056 3057
}

3058
static const struct file_operations packet_seq_fops = {
L
Linus Torvalds 已提交
3059 3060 3061 3062
	.owner		= THIS_MODULE,
	.open		= packet_seq_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
3063
	.release	= seq_release_net,
L
Linus Torvalds 已提交
3064 3065 3066 3067
};

#endif

3068
static int __net_init packet_net_init(struct net *net)
3069
{
3070
	spin_lock_init(&net->packet.sklist_lock);
3071
	INIT_HLIST_HEAD(&net->packet.sklist);
3072 3073 3074 3075 3076 3077 3078

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

	return 0;
}

3079
static void __net_exit packet_net_exit(struct net *net)
3080 3081 3082 3083 3084 3085 3086 3087 3088 3089
{
	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
3090 3091 3092
static void __exit packet_exit(void)
{
	unregister_netdevice_notifier(&packet_netdev_notifier);
3093
	unregister_pernet_subsys(&packet_net_ops);
L
Linus Torvalds 已提交
3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105
	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);
3106
	register_pernet_subsys(&packet_net_ops);
L
Linus Torvalds 已提交
3107 3108 3109 3110 3111 3112 3113 3114 3115
	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);