af_packet.c 54.7 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6 7
/*
 * 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.
 *
8
 * Authors:	Ross Biro
L
Linus Torvalds 已提交
9 10 11
 *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *		Alan Cox, <gw4pts@gw4pts.ampr.org>
 *
12
 * Fixes:
L
Linus Torvalds 已提交
13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
 *		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.
35
 *         Ulises Alonso        :       Frame number limit removal and
L
Linus Torvalds 已提交
36
 *                                      packet_set_ring memory leak.
37 38 39
 *		Eric Biederman	:	Allow for > 8 byte hardware addresses.
 *					The convention is that longer addresses
 *					will simply extend the hardware address
40
 *					byte arrays at the end of sockaddr_ll
41
 *					and packet_mreq.
J
Johann Baudy 已提交
42
 *		Johann Baudy	:	Added TX RING.
L
Linus Torvalds 已提交
43 44 45 46 47 48 49
 *
 *		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.
 *
 */
50

L
Linus Torvalds 已提交
51 52
#include <linux/types.h>
#include <linux/mm.h>
53
#include <linux/capability.h>
L
Linus Torvalds 已提交
54 55 56 57 58 59 60
#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>
61
#include <linux/kernel.h>
L
Linus Torvalds 已提交
62
#include <linux/kmod.h>
63
#include <net/net_namespace.h>
L
Linus Torvalds 已提交
64 65 66 67 68 69 70 71 72 73
#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>
A
Al Viro 已提交
74
#include <asm/cacheflush.h>
L
Linus Torvalds 已提交
75 76 77 78 79 80
#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>
81
#include <linux/mutex.h>
L
Linus Torvalds 已提交
82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101

#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
102 103
   mac_header -> ll header
   data       -> data
L
Linus Torvalds 已提交
104 105

Outgoing, dev->hard_header!=NULL
106 107
   mac_header -> ll header
   data       -> ll header
L
Linus Torvalds 已提交
108 109

Incoming, dev->hard_header==NULL
110 111
   mac_header -> UNKNOWN position. It is very likely, that it points to ll
		 header.  PPP makes it, that is wrong, because introduce
112
		 assymetry between rx and tx paths.
113
   data       -> data
L
Linus Torvalds 已提交
114 115

Outgoing, dev->hard_header==NULL
116 117
   mac_header -> data. ll header is still not built!
   data       -> data
L
Linus Torvalds 已提交
118 119 120 121 122 123 124 125 126

Resume
  If dev->hard_header==NULL we are unlikely to restore sensible ll header.


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

dev->hard_header != NULL
127 128
   mac_header -> ll header
   data       -> ll header
L
Linus Torvalds 已提交
129 130

dev->hard_header == NULL (ll header is added by device, we cannot control it)
131 132
   mac_header -> data
   data       -> data
L
Linus Torvalds 已提交
133 134 135 136 137 138 139 140 141 142 143 144 145 146

   We should set nh.raw on output to correct posistion,
   packet classifier depends on it.
 */

/* Private packet socket structures. */

struct packet_mclist
{
	struct packet_mclist	*next;
	int			ifindex;
	int			count;
	unsigned short		type;
	unsigned short		alen;
147 148 149 150 151 152 153 154 155 156 157
	unsigned char		addr[MAX_ADDR_LEN];
};
/* identical to struct packet_mreq except it has
 * a longer address field.
 */
struct packet_mreq_max
{
	int		mr_ifindex;
	unsigned short	mr_type;
	unsigned short	mr_alen;
	unsigned char	mr_address[MAX_ADDR_LEN];
L
Linus Torvalds 已提交
158
};
159

L
Linus Torvalds 已提交
160
#ifdef CONFIG_PACKET_MMAP
J
Johann Baudy 已提交
161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179
static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
		int closing, int tx_ring);

struct packet_ring_buffer {
	char *			*pg_vec;
	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);
L
Linus Torvalds 已提交
180 181 182 183 184 185 186 187 188
#endif

static void packet_flush_mclist(struct sock *sk);

struct packet_sock {
	/* struct sock has to be the first member of packet_sock */
	struct sock		sk;
	struct tpacket_stats	stats;
#ifdef CONFIG_PACKET_MMAP
J
Johann Baudy 已提交
189 190
	struct packet_ring_buffer	rx_ring;
	struct packet_ring_buffer	tx_ring;
L
Linus Torvalds 已提交
191 192 193 194
	int			copy_thresh;
#endif
	struct packet_type	prot_hook;
	spinlock_t		bind_lock;
195
	struct mutex		pg_vec_lock;
196
	unsigned int		running:1,	/* prot_hook is attached*/
197 198
				auxdata:1,
				origdev:1;
L
Linus Torvalds 已提交
199
	int			ifindex;	/* bound device		*/
A
Al Viro 已提交
200
	__be16			num;
L
Linus Torvalds 已提交
201 202 203
	struct packet_mclist	*mclist;
#ifdef CONFIG_PACKET_MMAP
	atomic_t		mapped;
204 205
	enum tpacket_versions	tp_version;
	unsigned int		tp_hdrlen;
206
	unsigned int		tp_reserve;
J
Johann Baudy 已提交
207
	unsigned int		tp_loss:1;
L
Linus Torvalds 已提交
208 209 210
#endif
};

211 212 213 214 215 216 217 218 219
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))
220

L
Linus Torvalds 已提交
221 222
#ifdef CONFIG_PACKET_MMAP

J
Johann Baudy 已提交
223
static void __packet_set_status(struct packet_sock *po, void *frame, int status)
L
Linus Torvalds 已提交
224
{
225 226 227 228 229
	union {
		struct tpacket_hdr *h1;
		struct tpacket2_hdr *h2;
		void *raw;
	} h;
L
Linus Torvalds 已提交
230

J
Johann Baudy 已提交
231
	h.raw = frame;
232 233
	switch (po->tp_version) {
	case TPACKET_V1:
J
Johann Baudy 已提交
234 235
		h.h1->tp_status = status;
		flush_dcache_page(virt_to_page(&h.h1->tp_status));
236 237
		break;
	case TPACKET_V2:
J
Johann Baudy 已提交
238 239
		h.h2->tp_status = status;
		flush_dcache_page(virt_to_page(&h.h2->tp_status));
240
		break;
J
Johann Baudy 已提交
241 242 243
	default:
		printk(KERN_ERR "TPACKET version not supported\n");
		BUG();
244
	}
J
Johann Baudy 已提交
245 246

	smp_wmb();
247 248
}

J
Johann Baudy 已提交
249
static int __packet_get_status(struct packet_sock *po, void *frame)
250 251 252 253 254 255 256
{
	union {
		struct tpacket_hdr *h1;
		struct tpacket2_hdr *h2;
		void *raw;
	} h;

J
Johann Baudy 已提交
257 258
	smp_rmb();

259 260 261
	h.raw = frame;
	switch (po->tp_version) {
	case TPACKET_V1:
J
Johann Baudy 已提交
262 263
		flush_dcache_page(virt_to_page(&h.h1->tp_status));
		return h.h1->tp_status;
264
	case TPACKET_V2:
J
Johann Baudy 已提交
265 266 267 268 269 270
		flush_dcache_page(virt_to_page(&h.h2->tp_status));
		return h.h2->tp_status;
	default:
		printk(KERN_ERR "TPACKET version not supported\n");
		BUG();
		return 0;
271
	}
L
Linus Torvalds 已提交
272
}
J
Johann Baudy 已提交
273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316

static void *packet_lookup_frame(struct packet_sock *po,
		struct packet_ring_buffer *rb,
		unsigned int position,
		int status)
{
	unsigned int pg_vec_pos, frame_offset;
	union {
		struct tpacket_hdr *h1;
		struct tpacket2_hdr *h2;
		void *raw;
	} h;

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

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

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

	return h.raw;
}

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

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

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

L
Linus Torvalds 已提交
317 318 319 320 321 322 323 324 325
#endif

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

static void packet_sock_destruct(struct sock *sk)
{
326 327
	WARN_ON(atomic_read(&sk->sk_rmem_alloc));
	WARN_ON(atomic_read(&sk->sk_wmem_alloc));
L
Linus Torvalds 已提交
328 329 330 331 332 333

	if (!sock_flag(sk, SOCK_DEAD)) {
		printk("Attempt to release alive packet socket: %p\n", sk);
		return;
	}

334
	sk_refcnt_debug_dec(sk);
L
Linus Torvalds 已提交
335 336 337
}


338
static const struct proto_ops packet_ops;
L
Linus Torvalds 已提交
339

340
static const struct proto_ops packet_ops_spkt;
L
Linus Torvalds 已提交
341

D
David S. Miller 已提交
342
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
343 344 345 346 347 348 349 350 351 352
{
	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;
353

L
Linus Torvalds 已提交
354 355 356 357 358 359 360
	/*
	 *	Yank back the headers [hope the device set this
	 *	right or kerboom...]
	 *
	 *	Incoming packets have ll header pulled,
	 *	push it back.
	 *
361
	 *	For outgoing ones skb->data == skb_mac_header(skb)
L
Linus Torvalds 已提交
362 363 364 365 366 367
	 *	so that this procedure is noop.
	 */

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

368
	if (dev_net(dev) != sock_net(sk))
369 370
		goto out;

L
Linus Torvalds 已提交
371 372 373 374 375 376 377
	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
		goto oom;

	/* drop any routing info */
	dst_release(skb->dst);
	skb->dst = NULL;

378 379 380
	/* drop conntrack reference */
	nf_reset(skb);

381
	spkt = &PACKET_SKB_CB(skb)->sa.pkt;
L
Linus Torvalds 已提交
382

383
	skb_push(skb, skb->data - skb_mac_header(skb));
L
Linus Torvalds 已提交
384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411

	/*
	 *	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.
	 */

	if (sock_queue_rcv_skb(sk,skb) == 0)
		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
 */
412

L
Linus Torvalds 已提交
413 414 415 416 417 418 419
static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
			       struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
	struct sockaddr_pkt *saddr=(struct sockaddr_pkt *)msg->msg_name;
	struct sk_buff *skb;
	struct net_device *dev;
A
Al Viro 已提交
420
	__be16 proto=0;
L
Linus Torvalds 已提交
421
	int err;
422

L
Linus Torvalds 已提交
423
	/*
424
	 *	Get and verify the address.
L
Linus Torvalds 已提交
425 426 427 428 429 430 431 432 433 434 435 436 437
	 */

	if (saddr)
	{
		if (msg->msg_namelen < sizeof(struct sockaddr))
			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 */

	/*
438
	 *	Find the device first to size check it
L
Linus Torvalds 已提交
439 440 441
	 */

	saddr->spkt_device[13] = 0;
442
	dev = dev_get_by_name(sock_net(sk), saddr->spkt_device);
L
Linus Torvalds 已提交
443 444 445
	err = -ENODEV;
	if (dev == NULL)
		goto out_unlock;
446

447 448 449 450
	err = -ENETDOWN;
	if (!(dev->flags & IFF_UP))
		goto out_unlock;

L
Linus Torvalds 已提交
451 452 453 454
	/*
	 *	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.
	 */
455

L
Linus Torvalds 已提交
456
	err = -EMSGSIZE;
457
	if (len > dev->mtu + dev->hard_header_len)
L
Linus Torvalds 已提交
458 459 460 461 462 463 464 465 466 467
		goto out_unlock;

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

	/*
	 *	If the write buffer is full, then tough. At this level the user gets to
	 *	deal with the problem - do your own algorithmic backoffs. That's far
	 *	more flexible.
	 */
468 469

	if (skb == NULL)
L
Linus Torvalds 已提交
470 471 472
		goto out_unlock;

	/*
473
	 *	Fill it in
L
Linus Torvalds 已提交
474
	 */
475

L
Linus Torvalds 已提交
476 477 478 479 480
	/* FIXME: Save some space for broken drivers that write a
	 * hard header at transmission time by themselves. PPP is the
	 * notable one here. This should really be fixed at the driver level.
	 */
	skb_reserve(skb, LL_RESERVED_SPACE(dev));
481
	skb_reset_network_header(skb);
L
Linus Torvalds 已提交
482 483

	/* Try to align data part correctly */
484
	if (dev->header_ops) {
L
Linus Torvalds 已提交
485 486 487
		skb->data -= dev->hard_header_len;
		skb->tail -= dev->hard_header_len;
		if (len < dev->hard_header_len)
488
			skb_reset_network_header(skb);
L
Linus Torvalds 已提交
489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514
	}

	/* Returns -EFAULT on error */
	err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len);
	skb->protocol = proto;
	skb->dev = dev;
	skb->priority = sk->sk_priority;
	if (err)
		goto out_free;

	/*
	 *	Now send it
	 */

	dev_queue_xmit(skb);
	dev_put(dev);
	return(len);

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

D
David S. Miller 已提交
515 516
static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk,
				      unsigned int res)
L
Linus Torvalds 已提交
517 518
{
	struct sk_filter *filter;
519 520 521

	rcu_read_lock_bh();
	filter = rcu_dereference(sk->sk_filter);
D
David S. Miller 已提交
522 523
	if (filter != NULL)
		res = sk_run_filter(skb, filter->insns, filter->len);
524
	rcu_read_unlock_bh();
L
Linus Torvalds 已提交
525

D
David S. Miller 已提交
526
	return res;
L
Linus Torvalds 已提交
527 528 529 530 531 532 533 534 535 536 537 538 539 540
}

/*
   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.
 */

D
David S. Miller 已提交
541
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
542 543 544 545 546 547
{
	struct sock *sk;
	struct sockaddr_ll *sll;
	struct packet_sock *po;
	u8 * skb_head = skb->data;
	int skb_len = skb->len;
D
David S. Miller 已提交
548
	unsigned int snaplen, res;
L
Linus Torvalds 已提交
549 550 551 552 553 554 555

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

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

556
	if (dev_net(dev) != sock_net(sk))
557 558
		goto drop;

L
Linus Torvalds 已提交
559 560
	skb->dev = dev;

561
	if (dev->header_ops) {
L
Linus Torvalds 已提交
562 563 564 565 566 567 568 569
		/* The device has an explicit notion of ll header,
		   exported to higher levels.

		   Otherwise, the device hides datails of it frame
		   structure, so that corresponding packet head
		   never delivered to user.
		 */
		if (sk->sk_type != SOCK_DGRAM)
570
			skb_push(skb, skb->data - skb_mac_header(skb));
L
Linus Torvalds 已提交
571 572
		else if (skb->pkt_type == PACKET_OUTGOING) {
			/* Special case: outgoing packets have ll header at head */
573
			skb_pull(skb, skb_network_offset(skb));
L
Linus Torvalds 已提交
574 575 576 577 578
		}
	}

	snaplen = skb->len;

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

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

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

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

602 603 604 605
	BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 >
		     sizeof(skb->cb));

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

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

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

L
Linus Torvalds 已提交
619 620 621 622 623 624 625 626
	if (pskb_trim(skb, snaplen))
		goto drop_n_acct;

	skb_set_owner_r(skb, sk);
	skb->dev = NULL;
	dst_release(skb->dst);
	skb->dst = NULL;

627 628 629
	/* drop conntrack reference */
	nf_reset(skb);

L
Linus Torvalds 已提交
630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647
	spin_lock(&sk->sk_receive_queue.lock);
	po->stats.tp_packets++;
	__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:
	spin_lock(&sk->sk_receive_queue.lock);
	po->stats.tp_drops++;
	spin_unlock(&sk->sk_receive_queue.lock);

drop_n_restore:
	if (skb_head != skb->data && skb_shared(skb)) {
		skb->data = skb_head;
		skb->len = skb_len;
	}
drop:
648
	consume_skb(skb);
L
Linus Torvalds 已提交
649 650 651 652
	return 0;
}

#ifdef CONFIG_PACKET_MMAP
D
David S. Miller 已提交
653
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
654 655 656 657
{
	struct sock *sk;
	struct packet_sock *po;
	struct sockaddr_ll *sll;
658 659 660 661 662
	union {
		struct tpacket_hdr *h1;
		struct tpacket2_hdr *h2;
		void *raw;
	} h;
L
Linus Torvalds 已提交
663 664
	u8 * skb_head = skb->data;
	int skb_len = skb->len;
D
David S. Miller 已提交
665
	unsigned int snaplen, res;
L
Linus Torvalds 已提交
666
	unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
667
	unsigned short macoff, netoff, hdrlen;
L
Linus Torvalds 已提交
668
	struct sk_buff *copy_skb = NULL;
669
	struct timeval tv;
670
	struct timespec ts;
L
Linus Torvalds 已提交
671 672 673 674 675 676 677

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

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

678
	if (dev_net(dev) != sock_net(sk))
679 680
		goto drop;

681
	if (dev->header_ops) {
L
Linus Torvalds 已提交
682
		if (sk->sk_type != SOCK_DGRAM)
683
			skb_push(skb, skb->data - skb_mac_header(skb));
L
Linus Torvalds 已提交
684 685
		else if (skb->pkt_type == PACKET_OUTGOING) {
			/* Special case: outgoing packets have ll header at head */
686
			skb_pull(skb, skb_network_offset(skb));
L
Linus Torvalds 已提交
687 688 689
		}
	}

690 691 692
	if (skb->ip_summed == CHECKSUM_PARTIAL)
		status |= TP_STATUS_CSUMNOTREADY;

L
Linus Torvalds 已提交
693 694
	snaplen = skb->len;

D
David S. Miller 已提交
695 696
	res = run_filter(skb, sk, snaplen);
	if (!res)
697
		goto drop_n_restore;
D
David S. Miller 已提交
698 699
	if (snaplen > res)
		snaplen = res;
L
Linus Torvalds 已提交
700 701

	if (sk->sk_type == SOCK_DGRAM) {
702 703
		macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
				  po->tp_reserve;
L
Linus Torvalds 已提交
704
	} else {
705
		unsigned maclen = skb_network_offset(skb);
706
		netoff = TPACKET_ALIGN(po->tp_hdrlen +
707 708
				       (maclen < 16 ? 16 : maclen)) +
			po->tp_reserve;
L
Linus Torvalds 已提交
709 710 711
		macoff = netoff - maclen;
	}

J
Johann Baudy 已提交
712
	if (macoff + snaplen > po->rx_ring.frame_size) {
L
Linus Torvalds 已提交
713 714 715 716 717 718 719 720 721 722 723 724
		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
725
		snaplen = po->rx_ring.frame_size - macoff;
L
Linus Torvalds 已提交
726 727 728 729 730
		if ((int)snaplen < 0)
			snaplen = 0;
	}

	spin_lock(&sk->sk_receive_queue.lock);
J
Johann Baudy 已提交
731
	h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL);
732
	if (!h.raw)
L
Linus Torvalds 已提交
733
		goto ring_is_full;
J
Johann Baudy 已提交
734
	packet_increment_head(&po->rx_ring);
L
Linus Torvalds 已提交
735 736 737 738 739 740 741 742 743
	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);

744
	skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
L
Linus Torvalds 已提交
745

746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770
	switch (po->tp_version) {
	case TPACKET_V1:
		h.h1->tp_len = skb->len;
		h.h1->tp_snaplen = snaplen;
		h.h1->tp_mac = macoff;
		h.h1->tp_net = netoff;
		if (skb->tstamp.tv64)
			tv = ktime_to_timeval(skb->tstamp);
		else
			do_gettimeofday(&tv);
		h.h1->tp_sec = tv.tv_sec;
		h.h1->tp_usec = tv.tv_usec;
		hdrlen = sizeof(*h.h1);
		break;
	case TPACKET_V2:
		h.h2->tp_len = skb->len;
		h.h2->tp_snaplen = snaplen;
		h.h2->tp_mac = macoff;
		h.h2->tp_net = netoff;
		if (skb->tstamp.tv64)
			ts = ktime_to_timespec(skb->tstamp);
		else
			getnstimeofday(&ts);
		h.h2->tp_sec = ts.tv_sec;
		h.h2->tp_nsec = ts.tv_nsec;
771
		h.h2->tp_vlan_tci = skb->vlan_tci;
772 773 774 775 776
		hdrlen = sizeof(*h.h2);
		break;
	default:
		BUG();
	}
L
Linus Torvalds 已提交
777

778
	sll = h.raw + TPACKET_ALIGN(hdrlen);
S
Stephen Hemminger 已提交
779
	sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
L
Linus Torvalds 已提交
780 781 782 783
	sll->sll_family = AF_PACKET;
	sll->sll_hatype = dev->type;
	sll->sll_protocol = skb->protocol;
	sll->sll_pkttype = skb->pkt_type;
784
	if (unlikely(po->origdev))
785 786 787
		sll->sll_ifindex = orig_dev->ifindex;
	else
		sll->sll_ifindex = dev->ifindex;
L
Linus Torvalds 已提交
788

789
	__packet_set_status(po, h.raw, status);
R
Ralf Baechle 已提交
790
	smp_mb();
L
Linus Torvalds 已提交
791 792
	{
		struct page *p_start, *p_end;
793
		u8 *h_end = h.raw + macoff + snaplen - 1;
L
Linus Torvalds 已提交
794

795
		p_start = virt_to_page(h.raw);
L
Linus Torvalds 已提交
796 797 798 799 800 801 802 803 804 805 806 807 808 809 810
		p_end = virt_to_page(h_end);
		while (p_start <= p_end) {
			flush_dcache_page(p_start);
			p_start++;
		}
	}

	sk->sk_data_ready(sk, 0);

drop_n_restore:
	if (skb_head != skb->data && skb_shared(skb)) {
		skb->data = skb_head;
		skb->len = skb_len;
	}
drop:
811
	kfree_skb(skb);
L
Linus Torvalds 已提交
812 813 814 815 816 817 818
	return 0;

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

	sk->sk_data_ready(sk, 0);
819
	kfree_skb(copy_skb);
L
Linus Torvalds 已提交
820 821 822
	goto drop_n_restore;
}

J
Johann Baudy 已提交
823 824 825 826
static void tpacket_destruct_skb(struct sk_buff *skb)
{
	struct packet_sock *po = pkt_sk(skb->sk);
	void * ph;
L
Linus Torvalds 已提交
827

J
Johann Baudy 已提交
828
	BUG_ON(skb == NULL);
L
Linus Torvalds 已提交
829

J
Johann Baudy 已提交
830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065
	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);
}

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)
{
	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;
	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)) {
		printk(KERN_ERR "packet size is too long (%d > %d)\n",
				tp_len, size_max);
		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;
	} else if (dev->hard_header_len ) {
		/* net device doesn't like empty head */
		if (unlikely(tp_len <= dev->hard_header_len)) {
			printk(KERN_ERR "packet size is too short "
					"(%d < %d)\n", tp_len,
					dev->hard_header_len);
			return -EINVAL;
		}

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

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

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

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

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

		if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
			printk(KERN_ERR "Packet exceed the number "
					"of skb frags(%lu)\n",
					MAX_SKB_FRAGS);
			return -EFAULT;
		}

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

	return tp_len;
}

static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
{
	struct socket *sock;
	struct sk_buff *skb;
	struct net_device *dev;
	__be16 proto;
	int ifindex, err, reserve = 0;
	void * ph;
	struct sockaddr_ll *saddr=(struct sockaddr_ll *)msg->msg_name;
	int tp_len, size_max;
	unsigned char *addr;
	int len_sum = 0;
	int status = 0;

	sock = po->sk.sk_socket;

	mutex_lock(&po->pg_vec_lock);

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

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

	reserve = dev->hard_header_len;

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

	size_max = po->tx_ring.frame_size
		- sizeof(struct skb_shared_info)
		- po->tp_hdrlen
		- LL_ALLOCATED_SPACE(dev)
		- sizeof(struct sockaddr_ll);

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

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

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

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

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

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

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

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

		status = TP_STATUS_SEND_REQUEST;
		err = dev_queue_xmit(skb);
		if (unlikely(err > 0 && (err = net_xmit_errno(err)) != 0))
			goto out_xmit;
		packet_increment_head(&po->tx_ring);
		len_sum += tp_len;
	}
	while (likely((ph != NULL) || ((!(msg->msg_flags & MSG_DONTWAIT))
					&& (atomic_read(&po->tx_ring.pending))))
	      );

	err = len_sum;
	goto out_put;

out_xmit:
	skb->destructor = sock_wfree;
	atomic_dec(&po->tx_ring.pending);
out_status:
	__packet_set_status(po, ph, status);
	kfree_skb(skb);
out_put:
	dev_put(dev);
out:
	mutex_unlock(&po->pg_vec_lock);
	return err;
}
#endif

static int packet_snd(struct socket *sock,
L
Linus Torvalds 已提交
1066 1067 1068 1069 1070 1071
			  struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
	struct sockaddr_ll *saddr=(struct sockaddr_ll *)msg->msg_name;
	struct sk_buff *skb;
	struct net_device *dev;
A
Al Viro 已提交
1072
	__be16 proto;
L
Linus Torvalds 已提交
1073 1074 1075 1076
	unsigned char *addr;
	int ifindex, err, reserve = 0;

	/*
1077
	 *	Get and verify the address.
L
Linus Torvalds 已提交
1078
	 */
1079

L
Linus Torvalds 已提交
1080 1081 1082 1083 1084 1085 1086 1087 1088 1089
	if (saddr == NULL) {
		struct packet_sock *po = pkt_sk(sk);

		ifindex	= po->ifindex;
		proto	= po->num;
		addr	= NULL;
	} else {
		err = -EINVAL;
		if (msg->msg_namelen < sizeof(struct sockaddr_ll))
			goto out;
1090 1091
		if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
			goto out;
L
Linus Torvalds 已提交
1092 1093 1094 1095 1096 1097
		ifindex	= saddr->sll_ifindex;
		proto	= saddr->sll_protocol;
		addr	= saddr->sll_addr;
	}


1098
	dev = dev_get_by_index(sock_net(sk), ifindex);
L
Linus Torvalds 已提交
1099 1100 1101 1102 1103 1104
	err = -ENXIO;
	if (dev == NULL)
		goto out_unlock;
	if (sock->type == SOCK_RAW)
		reserve = dev->hard_header_len;

1105 1106 1107 1108
	err = -ENETDOWN;
	if (!(dev->flags & IFF_UP))
		goto out_unlock;

L
Linus Torvalds 已提交
1109 1110 1111 1112
	err = -EMSGSIZE;
	if (len > dev->mtu+reserve)
		goto out_unlock;

1113
	skb = sock_alloc_send_skb(sk, len + LL_ALLOCATED_SPACE(dev),
L
Linus Torvalds 已提交
1114 1115 1116 1117 1118
				msg->msg_flags & MSG_DONTWAIT, &err);
	if (skb==NULL)
		goto out_unlock;

	skb_reserve(skb, LL_RESERVED_SPACE(dev));
1119
	skb_reset_network_header(skb);
L
Linus Torvalds 已提交
1120

1121 1122 1123 1124
	err = -EINVAL;
	if (sock->type == SOCK_DGRAM &&
	    dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len) < 0)
		goto out_free;
L
Linus Torvalds 已提交
1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155

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

	skb->protocol = proto;
	skb->dev = dev;
	skb->priority = sk->sk_priority;

	/*
	 *	Now send it
	 */

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

	dev_put(dev);

	return(len);

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

J
Johann Baudy 已提交
1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168
static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
		struct msghdr *msg, size_t len)
{
#ifdef CONFIG_PACKET_MMAP
	struct sock *sk = sock->sk;
	struct packet_sock *po = pkt_sk(sk);
	if (po->tx_ring.pg_vec)
		return tpacket_snd(po, msg);
	else
#endif
		return packet_snd(sock, msg, len);
}

L
Linus Torvalds 已提交
1169 1170 1171 1172 1173 1174 1175 1176 1177
/*
 *	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;
1178
	struct net *net;
J
Johann Baudy 已提交
1179 1180 1181
#ifdef CONFIG_PACKET_MMAP
	struct tpacket_req req;
#endif
L
Linus Torvalds 已提交
1182 1183 1184 1185

	if (!sk)
		return 0;

1186
	net = sock_net(sk);
L
Linus Torvalds 已提交
1187 1188
	po = pkt_sk(sk);

1189
	write_lock_bh(&net->packet.sklist_lock);
L
Linus Torvalds 已提交
1190
	sk_del_node_init(sk);
1191
	sock_prot_inuse_add(net, sk->sk_prot, -1);
1192
	write_unlock_bh(&net->packet.sklist_lock);
L
Linus Torvalds 已提交
1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210

	/*
	 *	Unhook packet receive handler.
	 */

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

	packet_flush_mclist(sk);

#ifdef CONFIG_PACKET_MMAP
J
Johann Baudy 已提交
1211 1212 1213 1214 1215 1216 1217
	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
1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229
#endif

	/*
	 *	Now the socket is dead. No more input will appear.
	 */

	sock_orphan(sk);
	sock->sk = NULL;

	/* Purge queues */

	skb_queue_purge(&sk->sk_receive_queue);
1230
	sk_refcnt_debug_release(sk);
L
Linus Torvalds 已提交
1231 1232 1233 1234 1235 1236 1237 1238 1239

	sock_put(sk);
	return 0;
}

/*
 *	Attach a packet hook.
 */

A
Al Viro 已提交
1240
static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
L
Linus Torvalds 已提交
1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267
{
	struct packet_sock *po = pkt_sk(sk);
	/*
	 *	Detach an existing hook if present.
	 */

	lock_sock(sk);

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

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

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

	if (protocol == 0)
		goto out_unlock;

1268
	if (!dev || (dev->flags & IFF_UP)) {
L
Linus Torvalds 已提交
1269 1270 1271
		dev_add_pack(&po->prot_hook);
		sock_hold(sk);
		po->running = 1;
1272 1273 1274 1275
	} else {
		sk->sk_err = ENETDOWN;
		if (!sock_flag(sk, SOCK_DEAD))
			sk->sk_error_report(sk);
L
Linus Torvalds 已提交
1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293
	}

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

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

static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
	struct sock *sk=sock->sk;
	char name[15];
	struct net_device *dev;
	int err = -ENODEV;
1294

L
Linus Torvalds 已提交
1295 1296 1297
	/*
	 *	Check legality
	 */
1298

1299
	if (addr_len != sizeof(struct sockaddr))
L
Linus Torvalds 已提交
1300 1301 1302
		return -EINVAL;
	strlcpy(name,uaddr->sa_data,sizeof(name));

1303
	dev = dev_get_by_name(sock_net(sk), name);
L
Linus Torvalds 已提交
1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321
	if (dev) {
		err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
		dev_put(dev);
	}
	return err;
}

static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
	struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr;
	struct sock *sk=sock->sk;
	struct net_device *dev = NULL;
	int err;


	/*
	 *	Check legality
	 */
1322

L
Linus Torvalds 已提交
1323 1324 1325 1326 1327 1328 1329
	if (addr_len < sizeof(struct sockaddr_ll))
		return -EINVAL;
	if (sll->sll_family != AF_PACKET)
		return -EINVAL;

	if (sll->sll_ifindex) {
		err = -ENODEV;
1330
		dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
L
Linus Torvalds 已提交
1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348
		if (dev == NULL)
			goto out;
	}
	err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
	if (dev)
		dev_put(dev);

out:
	return err;
}

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

/*
1349
 *	Create a packet of type SOCK_PACKET.
L
Linus Torvalds 已提交
1350 1351
 */

1352
static int packet_create(struct net *net, struct socket *sock, int protocol)
L
Linus Torvalds 已提交
1353 1354 1355
{
	struct sock *sk;
	struct packet_sock *po;
A
Al Viro 已提交
1356
	__be16 proto = (__force __be16)protocol; /* weird, but documented */
L
Linus Torvalds 已提交
1357 1358 1359 1360
	int err;

	if (!capable(CAP_NET_RAW))
		return -EPERM;
1361 1362
	if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
	    sock->type != SOCK_PACKET)
L
Linus Torvalds 已提交
1363 1364 1365 1366 1367
		return -ESOCKTNOSUPPORT;

	sock->state = SS_UNCONNECTED;

	err = -ENOBUFS;
1368
	sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
L
Linus Torvalds 已提交
1369 1370 1371 1372 1373 1374
	if (sk == NULL)
		goto out;

	sock->ops = &packet_ops;
	if (sock->type == SOCK_PACKET)
		sock->ops = &packet_ops_spkt;
1375

L
Linus Torvalds 已提交
1376 1377 1378 1379
	sock_init_data(sock, sk);

	po = pkt_sk(sk);
	sk->sk_family = PF_PACKET;
A
Al Viro 已提交
1380
	po->num = proto;
L
Linus Torvalds 已提交
1381 1382

	sk->sk_destruct = packet_sock_destruct;
1383
	sk_refcnt_debug_inc(sk);
L
Linus Torvalds 已提交
1384 1385 1386 1387 1388 1389

	/*
	 *	Attach a protocol block
	 */

	spin_lock_init(&po->bind_lock);
1390
	mutex_init(&po->pg_vec_lock);
L
Linus Torvalds 已提交
1391
	po->prot_hook.func = packet_rcv;
1392

L
Linus Torvalds 已提交
1393 1394
	if (sock->type == SOCK_PACKET)
		po->prot_hook.func = packet_rcv_spkt;
1395

L
Linus Torvalds 已提交
1396 1397
	po->prot_hook.af_packet_priv = sk;

A
Al Viro 已提交
1398 1399
	if (proto) {
		po->prot_hook.type = proto;
L
Linus Torvalds 已提交
1400 1401 1402 1403 1404
		dev_add_pack(&po->prot_hook);
		sock_hold(sk);
		po->running = 1;
	}

1405 1406
	write_lock_bh(&net->packet.sklist_lock);
	sk_add_node(sk, &net->packet.sklist);
1407
	sock_prot_inuse_add(net, &packet_proto, 1);
1408
	write_unlock_bh(&net->packet.sklist_lock);
L
Linus Torvalds 已提交
1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424
	return(0);
out:
	return err;
}

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

static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
			  struct msghdr *msg, size_t len, int flags)
{
	struct sock *sk = sock->sk;
	struct sk_buff *skb;
	int copied, err;
1425
	struct sockaddr_ll *sll;
L
Linus Torvalds 已提交
1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448

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

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

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

	skb=skb_recv_datagram(sk,flags,flags&MSG_DONTWAIT,&err);

	/*
1449
	 *	An error occurred so return it. Because skb_recv_datagram()
L
Linus Torvalds 已提交
1450 1451 1452 1453
	 *	handles the blocking we don't see and worry about blocking
	 *	retries.
	 */

1454
	if (skb == NULL)
L
Linus Torvalds 已提交
1455 1456
		goto out;

1457 1458 1459 1460 1461
	/*
	 *	If the address length field is there to be filled in, we fill
	 *	it in now.
	 */

1462
	sll = &PACKET_SKB_CB(skb)->sa.ll;
1463 1464 1465 1466 1467
	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
1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486
	/*
	 *	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;
	if (copied > len)
	{
		copied=len;
		msg->msg_flags|=MSG_TRUNC;
	}

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

	sock_recv_timestamp(msg, sk, skb);

	if (msg->msg_name)
1487 1488
		memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
		       msg->msg_namelen);
L
Linus Torvalds 已提交
1489

1490
	if (pkt_sk(sk)->auxdata) {
1491 1492 1493 1494 1495 1496 1497 1498
		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;
1499
		aux.tp_net = skb_network_offset(skb);
1500
		aux.tp_vlan_tci = skb->vlan_tci;
1501 1502

		put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
1503 1504
	}

L
Linus Torvalds 已提交
1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526
	/*
	 *	Free or return the buffer as appropriate. Again this
	 *	hides all the races and re-entrancy issues from us.
	 */
	err = (flags&MSG_TRUNC) ? skb->len : copied;

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

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

	if (peer)
		return -EOPNOTSUPP;

	uaddr->sa_family = AF_PACKET;
1527
	dev = dev_get_by_index(sock_net(sk), pkt_sk(sk)->ifindex);
L
Linus Torvalds 已提交
1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551
	if (dev) {
		strlcpy(uaddr->sa_data, dev->name, 15);
		dev_put(dev);
	} else
		memset(uaddr->sa_data, 0, 14);
	*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);
	struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr;

	if (peer)
		return -EOPNOTSUPP;

	sll->sll_family = AF_PACKET;
	sll->sll_ifindex = po->ifindex;
	sll->sll_protocol = po->num;
1552
	dev = dev_get_by_index(sock_net(sk), po->ifindex);
L
Linus Torvalds 已提交
1553 1554 1555 1556 1557 1558 1559 1560 1561
	if (dev) {
		sll->sll_hatype = dev->type;
		sll->sll_halen = dev->addr_len;
		memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
		dev_put(dev);
	} else {
		sll->sll_hatype = 0;	/* Bad: we have no ARPHRD_UNSPEC */
		sll->sll_halen = 0;
	}
1562
	*uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
L
Linus Torvalds 已提交
1563 1564 1565 1566

	return 0;
}

1567 1568
static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
			 int what)
L
Linus Torvalds 已提交
1569 1570 1571 1572
{
	switch (i->type) {
	case PACKET_MR_MULTICAST:
		if (what > 0)
1573
			return dev_mc_add(dev, i->addr, i->alen, 0);
L
Linus Torvalds 已提交
1574
		else
1575
			return dev_mc_delete(dev, i->addr, i->alen, 0);
L
Linus Torvalds 已提交
1576 1577
		break;
	case PACKET_MR_PROMISC:
1578
		return dev_set_promiscuity(dev, what);
L
Linus Torvalds 已提交
1579 1580
		break;
	case PACKET_MR_ALLMULTI:
1581
		return dev_set_allmulti(dev, what);
L
Linus Torvalds 已提交
1582
		break;
1583 1584
	case PACKET_MR_UNICAST:
		if (what > 0)
J
Jiri Pirko 已提交
1585
			return dev_unicast_add(dev, i->addr);
1586
		else
J
Jiri Pirko 已提交
1587
			return dev_unicast_delete(dev, i->addr);
1588
		break;
L
Linus Torvalds 已提交
1589 1590
	default:;
	}
1591
	return 0;
L
Linus Torvalds 已提交
1592 1593 1594 1595 1596 1597 1598 1599 1600 1601
}

static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
{
	for ( ; i; i=i->next) {
		if (i->ifindex == dev->ifindex)
			packet_dev_mc(dev, i, what);
	}
}

1602
static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
L
Linus Torvalds 已提交
1603 1604 1605 1606 1607 1608 1609 1610 1611
{
	struct packet_sock *po = pkt_sk(sk);
	struct packet_mclist *ml, *i;
	struct net_device *dev;
	int err;

	rtnl_lock();

	err = -ENODEV;
1612
	dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
L
Linus Torvalds 已提交
1613 1614 1615 1616 1617 1618 1619 1620
	if (!dev)
		goto done;

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

	err = -ENOBUFS;
1621
	i = kmalloc(sizeof(*i), GFP_KERNEL);
L
Linus Torvalds 已提交
1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644
	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;
1645 1646 1647 1648 1649
	err = packet_dev_mc(dev, i, 1);
	if (err) {
		po->mclist = i->next;
		kfree(i);
	}
L
Linus Torvalds 已提交
1650 1651 1652 1653 1654 1655

done:
	rtnl_unlock();
	return err;
}

1656
static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
L
Linus Torvalds 已提交
1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669
{
	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;
1670
				dev = dev_get_by_index(sock_net(sk), ml->ifindex);
L
Linus Torvalds 已提交
1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697
				if (dev) {
					packet_dev_mc(dev, ml, -1);
					dev_put(dev);
				}
				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;
1698
		if ((dev = dev_get_by_index(sock_net(sk), ml->ifindex)) != NULL) {
L
Linus Torvalds 已提交
1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710
			packet_dev_mc(dev, ml, -1);
			dev_put(dev);
		}
		kfree(ml);
	}
	rtnl_unlock();
}

static int
packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
{
	struct sock *sk = sock->sk;
1711
	struct packet_sock *po = pkt_sk(sk);
L
Linus Torvalds 已提交
1712 1713 1714 1715 1716
	int ret;

	if (level != SOL_PACKET)
		return -ENOPROTOOPT;

J
Johann Baudy 已提交
1717
	switch (optname) {
1718
	case PACKET_ADD_MEMBERSHIP:
L
Linus Torvalds 已提交
1719 1720
	case PACKET_DROP_MEMBERSHIP:
	{
1721 1722 1723 1724
		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
1725
			return -EINVAL;
1726 1727 1728
		if (len > sizeof(mreq))
			len = sizeof(mreq);
		if (copy_from_user(&mreq,optval,len))
L
Linus Torvalds 已提交
1729
			return -EFAULT;
1730 1731
		if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
			return -EINVAL;
L
Linus Torvalds 已提交
1732 1733 1734 1735 1736 1737
		if (optname == PACKET_ADD_MEMBERSHIP)
			ret = packet_mc_add(sk, &mreq);
		else
			ret = packet_mc_drop(sk, &mreq);
		return ret;
	}
1738

L
Linus Torvalds 已提交
1739 1740
#ifdef CONFIG_PACKET_MMAP
	case PACKET_RX_RING:
J
Johann Baudy 已提交
1741
	case PACKET_TX_RING:
L
Linus Torvalds 已提交
1742 1743 1744 1745 1746 1747 1748
	{
		struct tpacket_req req;

		if (optlen<sizeof(req))
			return -EINVAL;
		if (copy_from_user(&req,optval,sizeof(req)))
			return -EFAULT;
J
Johann Baudy 已提交
1749
		return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING);
L
Linus Torvalds 已提交
1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762
	}
	case PACKET_COPY_THRESH:
	{
		int val;

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

		pkt_sk(sk)->copy_thresh = val;
		return 0;
	}
1763 1764 1765 1766 1767 1768
	case PACKET_VERSION:
	{
		int val;

		if (optlen != sizeof(val))
			return -EINVAL;
J
Johann Baudy 已提交
1769
		if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781
			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;
		}
	}
1782 1783 1784 1785 1786 1787
	case PACKET_RESERVE:
	{
		unsigned int val;

		if (optlen != sizeof(val))
			return -EINVAL;
J
Johann Baudy 已提交
1788
		if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1789 1790 1791 1792 1793 1794
			return -EBUSY;
		if (copy_from_user(&val, optval, sizeof(val)))
			return -EFAULT;
		po->tp_reserve = val;
		return 0;
	}
J
Johann Baudy 已提交
1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807
	case PACKET_LOSS:
	{
		unsigned int val;

		if (optlen != sizeof(val))
			return -EINVAL;
		if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
			return -EBUSY;
		if (copy_from_user(&val, optval, sizeof(val)))
			return -EFAULT;
		po->tp_loss = !!val;
		return 0;
	}
L
Linus Torvalds 已提交
1808
#endif
1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820
	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;
	}
1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832
	case PACKET_ORIGDEV:
	{
		int val;

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

		po->origdev = !!val;
		return 0;
	}
L
Linus Torvalds 已提交
1833 1834 1835 1836 1837 1838 1839 1840 1841
	default:
		return -ENOPROTOOPT;
	}
}

static int packet_getsockopt(struct socket *sock, int level, int optname,
			     char __user *optval, int __user *optlen)
{
	int len;
1842
	int val;
L
Linus Torvalds 已提交
1843 1844
	struct sock *sk = sock->sk;
	struct packet_sock *po = pkt_sk(sk);
1845 1846
	void *data;
	struct tpacket_stats st;
L
Linus Torvalds 已提交
1847 1848 1849 1850

	if (level != SOL_PACKET)
		return -ENOPROTOOPT;

1851 1852
	if (get_user(len, optlen))
		return -EFAULT;
L
Linus Torvalds 已提交
1853 1854 1855

	if (len < 0)
		return -EINVAL;
1856

J
Johann Baudy 已提交
1857
	switch (optname) {
L
Linus Torvalds 已提交
1858 1859 1860 1861 1862 1863 1864 1865 1866
	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;

1867 1868 1869 1870 1871 1872 1873
		data = &st;
		break;
	case PACKET_AUXDATA:
		if (len > sizeof(int))
			len = sizeof(int);
		val = po->auxdata;

1874 1875 1876 1877 1878 1879 1880
		data = &val;
		break;
	case PACKET_ORIGDEV:
		if (len > sizeof(int))
			len = sizeof(int);
		val = po->origdev;

1881
		data = &val;
L
Linus Torvalds 已提交
1882
		break;
1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906
#ifdef CONFIG_PACKET_MMAP
	case PACKET_VERSION:
		if (len > sizeof(int))
			len = sizeof(int);
		val = po->tp_version;
		data = &val;
		break;
	case PACKET_HDRLEN:
		if (len > sizeof(int))
			len = sizeof(int);
		if (copy_from_user(&val, optval, len))
			return -EFAULT;
		switch (val) {
		case TPACKET_V1:
			val = sizeof(struct tpacket_hdr);
			break;
		case TPACKET_V2:
			val = sizeof(struct tpacket2_hdr);
			break;
		default:
			return -EINVAL;
		}
		data = &val;
		break;
1907 1908 1909 1910 1911 1912
	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
1913 1914 1915 1916 1917 1918
	case PACKET_LOSS:
		if (len > sizeof(unsigned int))
			len = sizeof(unsigned int);
		val = po->tp_loss;
		data = &val;
		break;
1919
#endif
L
Linus Torvalds 已提交
1920 1921 1922 1923
	default:
		return -ENOPROTOOPT;
	}

1924 1925
	if (put_user(len, optlen))
		return -EFAULT;
1926 1927
	if (copy_to_user(optval, data, len))
		return -EFAULT;
1928
	return 0;
L
Linus Torvalds 已提交
1929 1930 1931 1932 1933 1934 1935
}


static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
{
	struct sock *sk;
	struct hlist_node *node;
1936
	struct net_device *dev = data;
1937
	struct net *net = dev_net(dev);
L
Linus Torvalds 已提交
1938

1939 1940
	read_lock(&net->packet.sklist_lock);
	sk_for_each(sk, node, &net->packet.sklist) {
L
Linus Torvalds 已提交
1941 1942 1943 1944 1945 1946
		struct packet_sock *po = pkt_sk(sk);

		switch (msg) {
		case NETDEV_UNREGISTER:
			if (po->mclist)
				packet_dev_mclist(dev, po->mclist, -1);
1947 1948
			/* fallthrough */

L
Linus Torvalds 已提交
1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978
		case NETDEV_DOWN:
			if (dev->ifindex == po->ifindex) {
				spin_lock(&po->bind_lock);
				if (po->running) {
					__dev_remove_pack(&po->prot_hook);
					__sock_put(sk);
					po->running = 0;
					sk->sk_err = ENETDOWN;
					if (!sock_flag(sk, SOCK_DEAD))
						sk->sk_error_report(sk);
				}
				if (msg == NETDEV_UNREGISTER) {
					po->ifindex = -1;
					po->prot_hook.dev = NULL;
				}
				spin_unlock(&po->bind_lock);
			}
			break;
		case NETDEV_UP:
			spin_lock(&po->bind_lock);
			if (dev->ifindex == po->ifindex && po->num &&
			    !po->running) {
				dev_add_pack(&po->prot_hook);
				sock_hold(sk);
				po->running = 1;
			}
			spin_unlock(&po->bind_lock);
			break;
		}
	}
1979
	read_unlock(&net->packet.sklist_lock);
L
Linus Torvalds 已提交
1980 1981 1982 1983 1984 1985 1986 1987 1988
	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
1989
	switch (cmd) {
L
Linus Torvalds 已提交
1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008
		case SIOCOUTQ:
		{
			int amount = atomic_read(&sk->sk_wmem_alloc);
			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);
2009 2010
		case SIOCGSTAMPNS:
			return sock_get_timestampns(sk, (struct timespec __user *)arg);
2011

L
Linus Torvalds 已提交
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026
#ifdef CONFIG_INET
		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:
2027
			if (!net_eq(sock_net(sk), &init_net))
2028
				return -ENOIOCTLCMD;
L
Linus Torvalds 已提交
2029 2030 2031 2032
			return inet_dgram_ops.ioctl(sock, cmd, arg);
#endif

		default:
2033
			return -ENOIOCTLCMD;
L
Linus Torvalds 已提交
2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050
	}
	return 0;
}

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

static unsigned int packet_poll(struct file * file, struct socket *sock,
				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
2051 2052
	if (po->rx_ring.pg_vec) {
		if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL))
L
Linus Torvalds 已提交
2053 2054 2055
			mask |= POLLIN | POLLRDNORM;
	}
	spin_unlock_bh(&sk->sk_receive_queue.lock);
J
Johann Baudy 已提交
2056 2057 2058 2059 2060 2061
	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
2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072
	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;
2073
	struct socket * sock = file->private_data;
L
Linus Torvalds 已提交
2074
	struct sock *sk = sock->sk;
2075

L
Linus Torvalds 已提交
2076 2077 2078 2079 2080 2081 2082
	if (sk)
		atomic_inc(&pkt_sk(sk)->mapped);
}

static void packet_mm_close(struct vm_area_struct *vma)
{
	struct file *file = vma->vm_file;
2083
	struct socket * sock = file->private_data;
L
Linus Torvalds 已提交
2084
	struct sock *sk = sock->sk;
2085

L
Linus Torvalds 已提交
2086 2087 2088 2089 2090 2091 2092 2093 2094
	if (sk)
		atomic_dec(&pkt_sk(sk)->mapped);
}

static struct vm_operations_struct packet_mmap_ops = {
	.open =	packet_mm_open,
	.close =packet_mm_close,
};

2095
static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len)
L
Linus Torvalds 已提交
2096 2097 2098
{
	int i;

2099 2100 2101
	for (i = 0; i < len; i++) {
		if (likely(pg_vec[i]))
			free_pages((unsigned long) pg_vec[i], order);
L
Linus Torvalds 已提交
2102 2103 2104 2105
	}
	kfree(pg_vec);
}

2106 2107
static inline char *alloc_one_pg_vec_page(unsigned long order)
{
2108 2109 2110
	gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | __GFP_NOWARN;

	return (char *) __get_free_pages(gfp_flags, order);
2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136
}

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

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

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

out:
	return pg_vec;

out_free_pgvec:
	free_pg_vec(pg_vec, order, block_nr);
	pg_vec = NULL;
	goto out;
}
L
Linus Torvalds 已提交
2137

J
Johann Baudy 已提交
2138 2139
static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
		int closing, int tx_ring)
L
Linus Torvalds 已提交
2140 2141 2142
{
	char **pg_vec = NULL;
	struct packet_sock *po = pkt_sk(sk);
A
Al Viro 已提交
2143
	int was_running, order = 0;
J
Johann Baudy 已提交
2144 2145
	struct packet_ring_buffer *rb;
	struct sk_buff_head *rb_queue;
A
Al Viro 已提交
2146
	__be16 num;
J
Johann Baudy 已提交
2147
	int err;
2148

J
Johann Baudy 已提交
2149 2150
	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
2151

J
Johann Baudy 已提交
2152 2153 2154 2155 2156 2157 2158
	err = -EBUSY;
	if (!closing) {
		if (atomic_read(&po->mapped))
			goto out;
		if (atomic_read(&rb->pending))
			goto out;
	}
L
Linus Torvalds 已提交
2159

J
Johann Baudy 已提交
2160 2161 2162 2163 2164
	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
2165

2166 2167 2168 2169 2170 2171 2172 2173 2174
		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
2175
		err = -EINVAL;
2176
		if (unlikely((int)req->tp_block_size <= 0))
J
Johann Baudy 已提交
2177
			goto out;
2178
		if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
J
Johann Baudy 已提交
2179
			goto out;
2180
		if (unlikely(req->tp_frame_size < po->tp_hdrlen +
J
Johann Baudy 已提交
2181 2182
					po->tp_reserve))
			goto out;
2183
		if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
J
Johann Baudy 已提交
2184
			goto out;
L
Linus Torvalds 已提交
2185

J
Johann Baudy 已提交
2186 2187 2188 2189 2190 2191
		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
2192 2193

		err = -ENOMEM;
2194 2195 2196
		order = get_order(req->tp_block_size);
		pg_vec = alloc_pg_vec(req, order);
		if (unlikely(!pg_vec))
L
Linus Torvalds 已提交
2197
			goto out;
J
Johann Baudy 已提交
2198 2199 2200 2201
	}
	/* Done */
	else {
		err = -EINVAL;
2202
		if (unlikely(req->tp_frame_nr))
J
Johann Baudy 已提交
2203
			goto out;
L
Linus Torvalds 已提交
2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218
	}

	lock_sock(sk);

	/* Detach socket from network */
	spin_lock(&po->bind_lock);
	was_running = po->running;
	num = po->num;
	if (was_running) {
		__dev_remove_pack(&po->prot_hook);
		po->num = 0;
		po->running = 0;
		__sock_put(sk);
	}
	spin_unlock(&po->bind_lock);
2219

L
Linus Torvalds 已提交
2220 2221 2222
	synchronize_net();

	err = -EBUSY;
2223
	mutex_lock(&po->pg_vec_lock);
L
Linus Torvalds 已提交
2224 2225 2226
	if (closing || atomic_read(&po->mapped) == 0) {
		err = 0;
#define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; })
J
Johann Baudy 已提交
2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240
		spin_lock_bh(&rb_queue->lock);
		pg_vec = XC(rb->pg_vec, pg_vec);
		rb->frame_max = (req->tp_frame_nr - 1);
		rb->head = 0;
		rb->frame_size = req->tp_frame_size;
		spin_unlock_bh(&rb_queue->lock);

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

		rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
		po->prot_hook.func = (po->rx_ring.pg_vec) ?
						tpacket_rcv : packet_rcv;
		skb_queue_purge(rb_queue);
L
Linus Torvalds 已提交
2241 2242
#undef XC
		if (atomic_read(&po->mapped))
J
Johann Baudy 已提交
2243 2244
			printk(KERN_DEBUG "packet_mmap: vma is busy: %d\n",
						atomic_read(&po->mapped));
L
Linus Torvalds 已提交
2245
	}
2246
	mutex_unlock(&po->pg_vec_lock);
L
Linus Torvalds 已提交
2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264

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

	release_sock(sk);

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

J
Johann Baudy 已提交
2265 2266
static int packet_mmap(struct file *file, struct socket *sock,
		struct vm_area_struct *vma)
L
Linus Torvalds 已提交
2267 2268 2269
{
	struct sock *sk = sock->sk;
	struct packet_sock *po = pkt_sk(sk);
J
Johann Baudy 已提交
2270 2271
	unsigned long size, expected_size;
	struct packet_ring_buffer *rb;
L
Linus Torvalds 已提交
2272 2273 2274 2275 2276 2277 2278
	unsigned long start;
	int err = -EINVAL;
	int i;

	if (vma->vm_pgoff)
		return -EINVAL;

2279
	mutex_lock(&po->pg_vec_lock);
J
Johann Baudy 已提交
2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290

	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
2291
		goto out;
J
Johann Baudy 已提交
2292 2293 2294

	size = vma->vm_end - vma->vm_start;
	if (size != expected_size)
L
Linus Torvalds 已提交
2295 2296 2297
		goto out;

	start = vma->vm_start;
J
Johann Baudy 已提交
2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312
	for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
		if (rb->pg_vec == NULL)
			continue;

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

			for (pg_num = 0; pg_num < rb->pg_vec_pages;
					pg_num++,page++) {
				err = vm_insert_page(vma, start, page);
				if (unlikely(err))
					goto out;
				start += PAGE_SIZE;
			}
2313
		}
L
Linus Torvalds 已提交
2314
	}
J
Johann Baudy 已提交
2315

2316
	atomic_inc(&po->mapped);
L
Linus Torvalds 已提交
2317 2318 2319 2320
	vma->vm_ops = &packet_mmap_ops;
	err = 0;

out:
2321
	mutex_unlock(&po->pg_vec_lock);
L
Linus Torvalds 已提交
2322 2323 2324 2325 2326
	return err;
}
#endif


2327
static const struct proto_ops packet_ops_spkt = {
L
Linus Torvalds 已提交
2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347
	.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,
};

2348
static const struct proto_ops packet_ops = {
L
Linus Torvalds 已提交
2349 2350 2351 2352 2353 2354 2355
	.family =	PF_PACKET,
	.owner =	THIS_MODULE,
	.release =	packet_release,
	.bind =		packet_bind,
	.connect =	sock_no_connect,
	.socketpair =	sock_no_socketpair,
	.accept =	sock_no_accept,
2356
	.getname =	packet_getname,
L
Linus Torvalds 已提交
2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379
	.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,
};

static struct net_proto_family packet_family_ops = {
	.family =	PF_PACKET,
	.create =	packet_create,
	.owner	=	THIS_MODULE,
};

static struct notifier_block packet_netdev_notifier = {
	.notifier_call =packet_notifier,
};

#ifdef CONFIG_PROC_FS
2380
static inline struct sock *packet_seq_idx(struct net *net, loff_t off)
L
Linus Torvalds 已提交
2381 2382 2383 2384
{
	struct sock *s;
	struct hlist_node *node;

2385
	sk_for_each(s, node, &net->packet.sklist) {
L
Linus Torvalds 已提交
2386 2387 2388 2389 2390 2391 2392
		if (!off--)
			return s;
	}
	return NULL;
}

static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
2393
	__acquires(seq_file_net(seq)->packet.sklist_lock)
L
Linus Torvalds 已提交
2394
{
2395
	struct net *net = seq_file_net(seq);
2396
	read_lock(&net->packet.sklist_lock);
2397
	return *pos ? packet_seq_idx(net, *pos - 1) : SEQ_START_TOKEN;
L
Linus Torvalds 已提交
2398 2399 2400 2401
}

static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
2402
	struct net *net = seq_file_net(seq);
L
Linus Torvalds 已提交
2403
	++*pos;
2404
	return  (v == SEQ_START_TOKEN)
2405
		? sk_head(&net->packet.sklist)
L
Linus Torvalds 已提交
2406 2407 2408 2409
		: sk_next((struct sock*)v) ;
}

static void packet_seq_stop(struct seq_file *seq, void *v)
2410
	__releases(seq_file_net(seq)->packet.sklist_lock)
L
Linus Torvalds 已提交
2411
{
2412
	struct net *net = seq_file_net(seq);
2413
	read_unlock(&net->packet.sklist_lock);
L
Linus Torvalds 已提交
2414 2415
}

2416
static int packet_seq_show(struct seq_file *seq, void *v)
L
Linus Torvalds 已提交
2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439
{
	if (v == SEQ_START_TOKEN)
		seq_puts(seq, "sk       RefCnt Type Proto  Iface R Rmem   User   Inode\n");
	else {
		struct sock *s = v;
		const struct packet_sock *po = pkt_sk(s);

		seq_printf(seq,
			   "%p %-6d %-4d %04x   %-5d %1d %-6u %-6u %-6lu\n",
			   s,
			   atomic_read(&s->sk_refcnt),
			   s->sk_type,
			   ntohs(po->num),
			   po->ifindex,
			   po->running,
			   atomic_read(&s->sk_rmem_alloc),
			   sock_i_uid(s),
			   sock_i_ino(s) );
	}

	return 0;
}

2440
static const struct seq_operations packet_seq_ops = {
L
Linus Torvalds 已提交
2441 2442 2443 2444 2445 2446 2447 2448
	.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)
{
2449 2450
	return seq_open_net(inode, file, &packet_seq_ops,
			    sizeof(struct seq_net_private));
L
Linus Torvalds 已提交
2451 2452
}

2453
static const struct file_operations packet_seq_fops = {
L
Linus Torvalds 已提交
2454 2455 2456 2457
	.owner		= THIS_MODULE,
	.open		= packet_seq_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
2458
	.release	= seq_release_net,
L
Linus Torvalds 已提交
2459 2460 2461 2462
};

#endif

2463 2464
static int packet_net_init(struct net *net)
{
2465 2466
	rwlock_init(&net->packet.sklist_lock);
	INIT_HLIST_HEAD(&net->packet.sklist);
2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484

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

	return 0;
}

static void packet_net_exit(struct net *net)
{
	proc_net_remove(net, "packet");
}

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


L
Linus Torvalds 已提交
2485 2486 2487
static void __exit packet_exit(void)
{
	unregister_netdevice_notifier(&packet_netdev_notifier);
2488
	unregister_pernet_subsys(&packet_net_ops);
L
Linus Torvalds 已提交
2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500
	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);
2501
	register_pernet_subsys(&packet_net_ops);
L
Linus Torvalds 已提交
2502 2503 2504 2505 2506 2507 2508 2509 2510
	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);