af_packet.c 43.6 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6 7 8 9
/*
 * 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.
 *
 * Version:	$Id: af_packet.c,v 1.61 2002/02/08 03:57:19 davem Exp $
 *
10
 * Authors:	Ross Biro
L
Linus Torvalds 已提交
11 12 13
 *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *		Alan Cox, <gw4pts@gw4pts.ampr.org>
 *
14
 * Fixes:
L
Linus Torvalds 已提交
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
 *		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.
37
 *         Ulises Alonso        :       Frame number limit removal and
L
Linus Torvalds 已提交
38
 *                                      packet_set_ring memory leak.
39 40 41
 *		Eric Biederman	:	Allow for > 8 byte hardware addresses.
 *					The convention is that longer addresses
 *					will simply extend the hardware address
42
 *					byte arrays at the end of sockaddr_ll
43
 *					and packet_mreq.
L
Linus Torvalds 已提交
44 45 46 47 48 49 50
 *
 *		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.
 *
 */
51

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

#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
160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179
#ifdef CONFIG_PACKET_MMAP
static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing);
#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
	char *			*pg_vec;
	unsigned int		head;
	unsigned int            frames_per_block;
	unsigned int		frame_size;
	unsigned int		frame_max;
	int			copy_thresh;
#endif
	struct packet_type	prot_hook;
	spinlock_t		bind_lock;
180
	unsigned int		running:1,	/* prot_hook is attached*/
181 182
				auxdata:1,
				origdev:1;
L
Linus Torvalds 已提交
183
	int			ifindex;	/* bound device		*/
A
Al Viro 已提交
184
	__be16			num;
L
Linus Torvalds 已提交
185 186 187 188 189 190 191 192 193
	struct packet_mclist	*mclist;
#ifdef CONFIG_PACKET_MMAP
	atomic_t		mapped;
	unsigned int            pg_vec_order;
	unsigned int		pg_vec_pages;
	unsigned int		pg_vec_len;
#endif
};

194 195 196 197 198 199 200 201 202
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))
203

L
Linus Torvalds 已提交
204 205
#ifdef CONFIG_PACKET_MMAP

206
static inline struct tpacket_hdr *packet_lookup_frame(struct packet_sock *po, unsigned int position)
L
Linus Torvalds 已提交
207 208 209 210 211 212
{
	unsigned int pg_vec_pos, frame_offset;

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

213
	return (struct tpacket_hdr *)(po->pg_vec[pg_vec_pos] + (frame_offset * po->frame_size));
L
Linus Torvalds 已提交
214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231
}
#endif

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

static void packet_sock_destruct(struct sock *sk)
{
	BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc));
	BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));

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

232
	sk_refcnt_debug_dec(sk);
L
Linus Torvalds 已提交
233 234 235
}


236
static const struct proto_ops packet_ops;
L
Linus Torvalds 已提交
237

238
static const struct proto_ops packet_ops_spkt;
L
Linus Torvalds 已提交
239

D
David S. Miller 已提交
240
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
241 242 243 244 245 246 247 248 249 250
{
	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;
251

L
Linus Torvalds 已提交
252 253 254 255 256 257 258
	/*
	 *	Yank back the headers [hope the device set this
	 *	right or kerboom...]
	 *
	 *	Incoming packets have ll header pulled,
	 *	push it back.
	 *
259
	 *	For outgoing ones skb->data == skb_mac_header(skb)
L
Linus Torvalds 已提交
260 261 262 263 264 265
	 *	so that this procedure is noop.
	 */

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

266 267 268
	if (dev->nd_net != sk->sk_net)
		goto out;

L
Linus Torvalds 已提交
269 270 271 272 273 274 275
	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
		goto oom;

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

276 277 278
	/* drop conntrack reference */
	nf_reset(skb);

279
	spkt = &PACKET_SKB_CB(skb)->sa.pkt;
L
Linus Torvalds 已提交
280

281
	skb_push(skb, skb->data - skb_mac_header(skb));
L
Linus Torvalds 已提交
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

	/*
	 *	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
 */
310

L
Linus Torvalds 已提交
311 312 313 314 315 316 317
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
318
	__be16 proto=0;
L
Linus Torvalds 已提交
319
	int err;
320

L
Linus Torvalds 已提交
321
	/*
322
	 *	Get and verify the address.
L
Linus Torvalds 已提交
323 324 325 326 327 328 329 330 331 332 333 334 335
	 */

	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 */

	/*
336
	 *	Find the device first to size check it
L
Linus Torvalds 已提交
337 338 339
	 */

	saddr->spkt_device[13] = 0;
340
	dev = dev_get_by_name(sk->sk_net, saddr->spkt_device);
L
Linus Torvalds 已提交
341 342 343
	err = -ENODEV;
	if (dev == NULL)
		goto out_unlock;
344

345 346 347 348
	err = -ENETDOWN;
	if (!(dev->flags & IFF_UP))
		goto out_unlock;

L
Linus Torvalds 已提交
349 350 351 352
	/*
	 *	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.
	 */
353

L
Linus Torvalds 已提交
354
	err = -EMSGSIZE;
355
	if (len > dev->mtu + dev->hard_header_len)
L
Linus Torvalds 已提交
356 357 358 359 360 361 362 363 364 365
		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.
	 */
366 367

	if (skb == NULL)
L
Linus Torvalds 已提交
368 369 370
		goto out_unlock;

	/*
371
	 *	Fill it in
L
Linus Torvalds 已提交
372
	 */
373

L
Linus Torvalds 已提交
374 375 376 377 378
	/* 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));
379
	skb_reset_network_header(skb);
L
Linus Torvalds 已提交
380 381

	/* Try to align data part correctly */
382
	if (dev->header_ops) {
L
Linus Torvalds 已提交
383 384 385
		skb->data -= dev->hard_header_len;
		skb->tail -= dev->hard_header_len;
		if (len < dev->hard_header_len)
386
			skb_reset_network_header(skb);
L
Linus Torvalds 已提交
387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412
	}

	/* 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
413 414
static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk,
				      unsigned int res)
L
Linus Torvalds 已提交
415 416
{
	struct sk_filter *filter;
417 418 419

	rcu_read_lock_bh();
	filter = rcu_dereference(sk->sk_filter);
D
David S. Miller 已提交
420 421
	if (filter != NULL)
		res = sk_run_filter(skb, filter->insns, filter->len);
422
	rcu_read_unlock_bh();
L
Linus Torvalds 已提交
423

D
David S. Miller 已提交
424
	return res;
L
Linus Torvalds 已提交
425 426 427 428 429 430 431 432 433 434 435 436 437 438
}

/*
   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
439
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
440 441 442 443 444 445
{
	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
446
	unsigned int snaplen, res;
L
Linus Torvalds 已提交
447 448 449 450 451 452 453

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

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

454 455 456
	if (dev->nd_net != sk->sk_net)
		goto drop;

L
Linus Torvalds 已提交
457 458
	skb->dev = dev;

459
	if (dev->header_ops) {
L
Linus Torvalds 已提交
460 461 462 463 464 465 466 467
		/* 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)
468
			skb_push(skb, skb->data - skb_mac_header(skb));
L
Linus Torvalds 已提交
469 470
		else if (skb->pkt_type == PACKET_OUTGOING) {
			/* Special case: outgoing packets have ll header at head */
471
			skb_pull(skb, skb_network_offset(skb));
L
Linus Torvalds 已提交
472 473 474 475 476
		}
	}

	snaplen = skb->len;

D
David S. Miller 已提交
477 478
	res = run_filter(skb, sk, snaplen);
	if (!res)
479
		goto drop_n_restore;
D
David S. Miller 已提交
480 481
	if (snaplen > res)
		snaplen = res;
L
Linus Torvalds 已提交
482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499

	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;
	}

500 501 502 503
	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
504 505 506 507
	sll->sll_family = AF_PACKET;
	sll->sll_hatype = dev->type;
	sll->sll_protocol = skb->protocol;
	sll->sll_pkttype = skb->pkt_type;
508
	if (unlikely(po->origdev))
509 510 511
		sll->sll_ifindex = orig_dev->ifindex;
	else
		sll->sll_ifindex = dev->ifindex;
L
Linus Torvalds 已提交
512

S
Stephen Hemminger 已提交
513
	sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
L
Linus Torvalds 已提交
514

515
	PACKET_SKB_CB(skb)->origlen = skb->len;
516

L
Linus Torvalds 已提交
517 518 519 520 521 522 523 524
	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;

525 526 527
	/* drop conntrack reference */
	nf_reset(skb);

L
Linus Torvalds 已提交
528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550
	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:
	kfree_skb(skb);
	return 0;
}

#ifdef CONFIG_PACKET_MMAP
D
David S. Miller 已提交
551
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
552 553 554 555 556 557 558
{
	struct sock *sk;
	struct packet_sock *po;
	struct sockaddr_ll *sll;
	struct tpacket_hdr *h;
	u8 * skb_head = skb->data;
	int skb_len = skb->len;
D
David S. Miller 已提交
559
	unsigned int snaplen, res;
L
Linus Torvalds 已提交
560 561 562
	unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
	unsigned short macoff, netoff;
	struct sk_buff *copy_skb = NULL;
563
	struct timeval tv;
L
Linus Torvalds 已提交
564 565 566 567 568 569 570

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

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

571 572 573
	if (dev->nd_net != sk->sk_net)
		goto drop;

574
	if (dev->header_ops) {
L
Linus Torvalds 已提交
575
		if (sk->sk_type != SOCK_DGRAM)
576
			skb_push(skb, skb->data - skb_mac_header(skb));
L
Linus Torvalds 已提交
577 578
		else if (skb->pkt_type == PACKET_OUTGOING) {
			/* Special case: outgoing packets have ll header at head */
579
			skb_pull(skb, skb_network_offset(skb));
L
Linus Torvalds 已提交
580 581 582
		}
	}

583 584 585
	if (skb->ip_summed == CHECKSUM_PARTIAL)
		status |= TP_STATUS_CSUMNOTREADY;

L
Linus Torvalds 已提交
586 587
	snaplen = skb->len;

D
David S. Miller 已提交
588 589
	res = run_filter(skb, sk, snaplen);
	if (!res)
590
		goto drop_n_restore;
D
David S. Miller 已提交
591 592
	if (snaplen > res)
		snaplen = res;
L
Linus Torvalds 已提交
593 594 595 596

	if (sk->sk_type == SOCK_DGRAM) {
		macoff = netoff = TPACKET_ALIGN(TPACKET_HDRLEN) + 16;
	} else {
597
		unsigned maclen = skb_network_offset(skb);
L
Linus Torvalds 已提交
598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620
		netoff = TPACKET_ALIGN(TPACKET_HDRLEN + (maclen < 16 ? 16 : maclen));
		macoff = netoff - maclen;
	}

	if (macoff + snaplen > po->frame_size) {
		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);
		}
		snaplen = po->frame_size - macoff;
		if ((int)snaplen < 0)
			snaplen = 0;
	}

	spin_lock(&sk->sk_receive_queue.lock);
621
	h = packet_lookup_frame(po, po->head);
622

L
Linus Torvalds 已提交
623 624 625 626 627 628 629 630 631 632 633 634
	if (h->tp_status)
		goto ring_is_full;
	po->head = po->head != po->frame_max ? po->head+1 : 0;
	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);

635
	skb_copy_bits(skb, 0, (u8*)h + macoff, snaplen);
L
Linus Torvalds 已提交
636 637 638 639 640

	h->tp_len = skb->len;
	h->tp_snaplen = snaplen;
	h->tp_mac = macoff;
	h->tp_net = netoff;
641 642 643 644
	if (skb->tstamp.tv64)
		tv = ktime_to_timeval(skb->tstamp);
	else
		do_gettimeofday(&tv);
645 646
	h->tp_sec = tv.tv_sec;
	h->tp_usec = tv.tv_usec;
L
Linus Torvalds 已提交
647 648

	sll = (struct sockaddr_ll*)((u8*)h + TPACKET_ALIGN(sizeof(*h)));
S
Stephen Hemminger 已提交
649
	sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
L
Linus Torvalds 已提交
650 651 652 653
	sll->sll_family = AF_PACKET;
	sll->sll_hatype = dev->type;
	sll->sll_protocol = skb->protocol;
	sll->sll_pkttype = skb->pkt_type;
654
	if (unlikely(po->origdev))
655 656 657
		sll->sll_ifindex = orig_dev->ifindex;
	else
		sll->sll_ifindex = dev->ifindex;
L
Linus Torvalds 已提交
658 659

	h->tp_status = status;
R
Ralf Baechle 已提交
660
	smp_mb();
L
Linus Torvalds 已提交
661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681

	{
		struct page *p_start, *p_end;
		u8 *h_end = (u8 *)h + macoff + snaplen - 1;

		p_start = virt_to_page(h);
		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:
682
	kfree_skb(skb);
L
Linus Torvalds 已提交
683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704
	return 0;

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

	sk->sk_data_ready(sk, 0);
	if (copy_skb)
		kfree_skb(copy_skb);
	goto drop_n_restore;
}

#endif


static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
			  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
705
	__be16 proto;
L
Linus Torvalds 已提交
706 707 708 709
	unsigned char *addr;
	int ifindex, err, reserve = 0;

	/*
710
	 *	Get and verify the address.
L
Linus Torvalds 已提交
711
	 */
712

L
Linus Torvalds 已提交
713 714 715 716 717 718 719 720 721 722
	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;
723 724
		if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
			goto out;
L
Linus Torvalds 已提交
725 726 727 728 729 730
		ifindex	= saddr->sll_ifindex;
		proto	= saddr->sll_protocol;
		addr	= saddr->sll_addr;
	}


731
	dev = dev_get_by_index(sk->sk_net, ifindex);
L
Linus Torvalds 已提交
732 733 734 735 736 737
	err = -ENXIO;
	if (dev == NULL)
		goto out_unlock;
	if (sock->type == SOCK_RAW)
		reserve = dev->hard_header_len;

738 739 740 741
	err = -ENETDOWN;
	if (!(dev->flags & IFF_UP))
		goto out_unlock;

L
Linus Torvalds 已提交
742 743 744 745 746 747 748 749 750 751
	err = -EMSGSIZE;
	if (len > dev->mtu+reserve)
		goto out_unlock;

	skb = sock_alloc_send_skb(sk, len + LL_RESERVED_SPACE(dev),
				msg->msg_flags & MSG_DONTWAIT, &err);
	if (skb==NULL)
		goto out_unlock;

	skb_reserve(skb, LL_RESERVED_SPACE(dev));
752
	skb_reset_network_header(skb);
L
Linus Torvalds 已提交
753

754 755 756 757
	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
758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797

	/* 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;
}

/*
 *	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;
798
	struct net *net;
L
Linus Torvalds 已提交
799 800 801 802

	if (!sk)
		return 0;

803
	net = sk->sk_net;
L
Linus Torvalds 已提交
804 805
	po = pkt_sk(sk);

806
	write_lock_bh(&net->packet.sklist_lock);
L
Linus Torvalds 已提交
807
	sk_del_node_init(sk);
808
	write_unlock_bh(&net->packet.sklist_lock);
L
Linus Torvalds 已提交
809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843

	/*
	 *	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
	if (po->pg_vec) {
		struct tpacket_req req;
		memset(&req, 0, sizeof(req));
		packet_set_ring(sk, &req, 1);
	}
#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);
844
	sk_refcnt_debug_release(sk);
L
Linus Torvalds 已提交
845 846 847 848 849 850 851 852 853

	sock_put(sk);
	return 0;
}

/*
 *	Attach a packet hook.
 */

A
Al Viro 已提交
854
static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
L
Linus Torvalds 已提交
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
{
	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;

882
	if (!dev || (dev->flags & IFF_UP)) {
L
Linus Torvalds 已提交
883 884 885
		dev_add_pack(&po->prot_hook);
		sock_hold(sk);
		po->running = 1;
886 887 888 889
	} else {
		sk->sk_err = ENETDOWN;
		if (!sock_flag(sk, SOCK_DEAD))
			sk->sk_error_report(sk);
L
Linus Torvalds 已提交
890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907
	}

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;
908

L
Linus Torvalds 已提交
909 910 911
	/*
	 *	Check legality
	 */
912

913
	if (addr_len != sizeof(struct sockaddr))
L
Linus Torvalds 已提交
914 915 916
		return -EINVAL;
	strlcpy(name,uaddr->sa_data,sizeof(name));

917
	dev = dev_get_by_name(sk->sk_net, name);
L
Linus Torvalds 已提交
918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935
	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
	 */
936

L
Linus Torvalds 已提交
937 938 939 940 941 942 943
	if (addr_len < sizeof(struct sockaddr_ll))
		return -EINVAL;
	if (sll->sll_family != AF_PACKET)
		return -EINVAL;

	if (sll->sll_ifindex) {
		err = -ENODEV;
944
		dev = dev_get_by_index(sk->sk_net, sll->sll_ifindex);
L
Linus Torvalds 已提交
945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962
		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),
};

/*
963
 *	Create a packet of type SOCK_PACKET.
L
Linus Torvalds 已提交
964 965
 */

966
static int packet_create(struct net *net, struct socket *sock, int protocol)
L
Linus Torvalds 已提交
967 968 969
{
	struct sock *sk;
	struct packet_sock *po;
A
Al Viro 已提交
970
	__be16 proto = (__force __be16)protocol; /* weird, but documented */
L
Linus Torvalds 已提交
971 972 973 974
	int err;

	if (!capable(CAP_NET_RAW))
		return -EPERM;
975 976
	if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
	    sock->type != SOCK_PACKET)
L
Linus Torvalds 已提交
977 978 979 980 981
		return -ESOCKTNOSUPPORT;

	sock->state = SS_UNCONNECTED;

	err = -ENOBUFS;
982
	sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
L
Linus Torvalds 已提交
983 984 985 986 987 988
	if (sk == NULL)
		goto out;

	sock->ops = &packet_ops;
	if (sock->type == SOCK_PACKET)
		sock->ops = &packet_ops_spkt;
989

L
Linus Torvalds 已提交
990 991 992 993
	sock_init_data(sock, sk);

	po = pkt_sk(sk);
	sk->sk_family = PF_PACKET;
A
Al Viro 已提交
994
	po->num = proto;
L
Linus Torvalds 已提交
995 996

	sk->sk_destruct = packet_sock_destruct;
997
	sk_refcnt_debug_inc(sk);
L
Linus Torvalds 已提交
998 999 1000 1001 1002 1003 1004

	/*
	 *	Attach a protocol block
	 */

	spin_lock_init(&po->bind_lock);
	po->prot_hook.func = packet_rcv;
1005

L
Linus Torvalds 已提交
1006 1007
	if (sock->type == SOCK_PACKET)
		po->prot_hook.func = packet_rcv_spkt;
1008

L
Linus Torvalds 已提交
1009 1010
	po->prot_hook.af_packet_priv = sk;

A
Al Viro 已提交
1011 1012
	if (proto) {
		po->prot_hook.type = proto;
L
Linus Torvalds 已提交
1013 1014 1015 1016 1017
		dev_add_pack(&po->prot_hook);
		sock_hold(sk);
		po->running = 1;
	}

1018 1019 1020
	write_lock_bh(&net->packet.sklist_lock);
	sk_add_node(sk, &net->packet.sklist);
	write_unlock_bh(&net->packet.sklist_lock);
L
Linus Torvalds 已提交
1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036
	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;
1037
	struct sockaddr_ll *sll;
L
Linus Torvalds 已提交
1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060

	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);

	/*
1061
	 *	An error occurred so return it. Because skb_recv_datagram()
L
Linus Torvalds 已提交
1062 1063 1064 1065
	 *	handles the blocking we don't see and worry about blocking
	 *	retries.
	 */

1066
	if (skb == NULL)
L
Linus Torvalds 已提交
1067 1068
		goto out;

1069 1070 1071 1072 1073
	/*
	 *	If the address length field is there to be filled in, we fill
	 *	it in now.
	 */

1074
	sll = &PACKET_SKB_CB(skb)->sa.ll;
1075 1076 1077 1078 1079
	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
1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098
	/*
	 *	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)
1099 1100
		memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
		       msg->msg_namelen);
L
Linus Torvalds 已提交
1101

1102
	if (pkt_sk(sk)->auxdata) {
1103 1104 1105 1106 1107 1108 1109 1110
		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;
1111
		aux.tp_net = skb_network_offset(skb);
1112 1113

		put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
1114 1115
	}

L
Linus Torvalds 已提交
1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137
	/*
	 *	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;
1138
	dev = dev_get_by_index(sk->sk_net, pkt_sk(sk)->ifindex);
L
Linus Torvalds 已提交
1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162
	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;
1163
	dev = dev_get_by_index(sk->sk_net, po->ifindex);
L
Linus Torvalds 已提交
1164 1165 1166 1167 1168 1169 1170 1171 1172
	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;
	}
1173
	*uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
L
Linus Torvalds 已提交
1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204

	return 0;
}

static void packet_dev_mc(struct net_device *dev, struct packet_mclist *i, int what)
{
	switch (i->type) {
	case PACKET_MR_MULTICAST:
		if (what > 0)
			dev_mc_add(dev, i->addr, i->alen, 0);
		else
			dev_mc_delete(dev, i->addr, i->alen, 0);
		break;
	case PACKET_MR_PROMISC:
		dev_set_promiscuity(dev, what);
		break;
	case PACKET_MR_ALLMULTI:
		dev_set_allmulti(dev, what);
		break;
	default:;
	}
}

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);
	}
}

1205
static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
L
Linus Torvalds 已提交
1206 1207 1208 1209 1210 1211 1212 1213 1214
{
	struct packet_sock *po = pkt_sk(sk);
	struct packet_mclist *ml, *i;
	struct net_device *dev;
	int err;

	rtnl_lock();

	err = -ENODEV;
1215
	dev = __dev_get_by_index(sk->sk_net, mreq->mr_ifindex);
L
Linus Torvalds 已提交
1216 1217 1218 1219 1220 1221 1222 1223
	if (!dev)
		goto done;

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

	err = -ENOBUFS;
1224
	i = kmalloc(sizeof(*i), GFP_KERNEL);
L
Linus Torvalds 已提交
1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254
	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;
	packet_dev_mc(dev, i, +1);

done:
	rtnl_unlock();
	return err;
}

1255
static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
L
Linus Torvalds 已提交
1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268
{
	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;
1269
				dev = dev_get_by_index(sk->sk_net, ml->ifindex);
L
Linus Torvalds 已提交
1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296
				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;
1297
		if ((dev = dev_get_by_index(sk->sk_net, ml->ifindex)) != NULL) {
L
Linus Torvalds 已提交
1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309
			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;
1310
	struct packet_sock *po = pkt_sk(sk);
L
Linus Torvalds 已提交
1311 1312 1313 1314 1315 1316
	int ret;

	if (level != SOL_PACKET)
		return -ENOPROTOOPT;

	switch(optname)	{
1317
	case PACKET_ADD_MEMBERSHIP:
L
Linus Torvalds 已提交
1318 1319
	case PACKET_DROP_MEMBERSHIP:
	{
1320 1321 1322 1323
		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
1324
			return -EINVAL;
1325 1326 1327
		if (len > sizeof(mreq))
			len = sizeof(mreq);
		if (copy_from_user(&mreq,optval,len))
L
Linus Torvalds 已提交
1328
			return -EFAULT;
1329 1330
		if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
			return -EINVAL;
L
Linus Torvalds 已提交
1331 1332 1333 1334 1335 1336
		if (optname == PACKET_ADD_MEMBERSHIP)
			ret = packet_mc_add(sk, &mreq);
		else
			ret = packet_mc_drop(sk, &mreq);
		return ret;
	}
1337

L
Linus Torvalds 已提交
1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361
#ifdef CONFIG_PACKET_MMAP
	case PACKET_RX_RING:
	{
		struct tpacket_req req;

		if (optlen<sizeof(req))
			return -EINVAL;
		if (copy_from_user(&req,optval,sizeof(req)))
			return -EFAULT;
		return packet_set_ring(sk, &req, 0);
	}
	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;
	}
#endif
1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373
	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;
	}
1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385
	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
1386 1387 1388 1389 1390 1391 1392 1393 1394
	default:
		return -ENOPROTOOPT;
	}
}

static int packet_getsockopt(struct socket *sock, int level, int optname,
			     char __user *optval, int __user *optlen)
{
	int len;
1395
	int val;
L
Linus Torvalds 已提交
1396 1397
	struct sock *sk = sock->sk;
	struct packet_sock *po = pkt_sk(sk);
1398 1399
	void *data;
	struct tpacket_stats st;
L
Linus Torvalds 已提交
1400 1401 1402 1403

	if (level != SOL_PACKET)
		return -ENOPROTOOPT;

1404 1405
	if (get_user(len, optlen))
		return -EFAULT;
L
Linus Torvalds 已提交
1406 1407 1408

	if (len < 0)
		return -EINVAL;
1409

L
Linus Torvalds 已提交
1410 1411 1412 1413 1414 1415 1416 1417 1418 1419
	switch(optname)	{
	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;

1420 1421 1422 1423 1424 1425 1426
		data = &st;
		break;
	case PACKET_AUXDATA:
		if (len > sizeof(int))
			len = sizeof(int);
		val = po->auxdata;

1427 1428 1429 1430 1431 1432 1433
		data = &val;
		break;
	case PACKET_ORIGDEV:
		if (len > sizeof(int))
			len = sizeof(int);
		val = po->origdev;

1434
		data = &val;
L
Linus Torvalds 已提交
1435 1436 1437 1438 1439
		break;
	default:
		return -ENOPROTOOPT;
	}

1440 1441
	if (put_user(len, optlen))
		return -EFAULT;
1442 1443
	if (copy_to_user(optval, data, len))
		return -EFAULT;
1444
	return 0;
L
Linus Torvalds 已提交
1445 1446 1447 1448 1449 1450 1451
}


static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
{
	struct sock *sk;
	struct hlist_node *node;
1452
	struct net_device *dev = data;
1453
	struct net *net = dev->nd_net;
L
Linus Torvalds 已提交
1454

1455 1456
	read_lock(&net->packet.sklist_lock);
	sk_for_each(sk, node, &net->packet.sklist) {
L
Linus Torvalds 已提交
1457 1458 1459 1460 1461 1462
		struct packet_sock *po = pkt_sk(sk);

		switch (msg) {
		case NETDEV_UNREGISTER:
			if (po->mclist)
				packet_dev_mclist(dev, po->mclist, -1);
1463 1464
			/* fallthrough */

L
Linus Torvalds 已提交
1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494
		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;
		}
	}
1495
	read_unlock(&net->packet.sklist_lock);
L
Linus Torvalds 已提交
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
	return NOTIFY_DONE;
}


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

	switch(cmd) {
		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);
1525 1526
		case SIOCGSTAMPNS:
			return sock_get_timestampns(sk, (struct timespec __user *)arg);
1527

L
Linus Torvalds 已提交
1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542
#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:
1543 1544
			if (sk->sk_net != &init_net)
				return -ENOIOCTLCMD;
L
Linus Torvalds 已提交
1545 1546 1547 1548
			return inet_dgram_ops.ioctl(sock, cmd, arg);
#endif

		default:
1549
			return -ENOIOCTLCMD;
L
Linus Torvalds 已提交
1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570
	}
	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);
	if (po->pg_vec) {
		unsigned last = po->head ? po->head-1 : po->frame_max;
		struct tpacket_hdr *h;

1571
		h = packet_lookup_frame(po, last);
L
Linus Torvalds 已提交
1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587

		if (h->tp_status)
			mask |= POLLIN | POLLRDNORM;
	}
	spin_unlock_bh(&sk->sk_receive_queue.lock);
	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;
1588
	struct socket * sock = file->private_data;
L
Linus Torvalds 已提交
1589
	struct sock *sk = sock->sk;
1590

L
Linus Torvalds 已提交
1591 1592 1593 1594 1595 1596 1597
	if (sk)
		atomic_inc(&pkt_sk(sk)->mapped);
}

static void packet_mm_close(struct vm_area_struct *vma)
{
	struct file *file = vma->vm_file;
1598
	struct socket * sock = file->private_data;
L
Linus Torvalds 已提交
1599
	struct sock *sk = sock->sk;
1600

L
Linus Torvalds 已提交
1601 1602 1603 1604 1605 1606 1607 1608 1609
	if (sk)
		atomic_dec(&pkt_sk(sk)->mapped);
}

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

1610
static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len)
L
Linus Torvalds 已提交
1611 1612 1613
{
	int i;

1614 1615 1616
	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
1617 1618 1619 1620
	}
	kfree(pg_vec);
}

1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650
static inline char *alloc_one_pg_vec_page(unsigned long order)
{
	return (char *) __get_free_pages(GFP_KERNEL | __GFP_COMP | __GFP_ZERO,
					 order);
}

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
1651 1652 1653 1654 1655

static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing)
{
	char **pg_vec = NULL;
	struct packet_sock *po = pkt_sk(sk);
A
Al Viro 已提交
1656 1657
	int was_running, order = 0;
	__be16 num;
L
Linus Torvalds 已提交
1658
	int err = 0;
1659

L
Linus Torvalds 已提交
1660
	if (req->tp_block_nr) {
J
Jiri Olsa 已提交
1661
		int i;
L
Linus Torvalds 已提交
1662 1663 1664

		/* Sanity tests and some calculations */

1665
		if (unlikely(po->pg_vec))
L
Linus Torvalds 已提交
1666 1667
			return -EBUSY;

1668
		if (unlikely((int)req->tp_block_size <= 0))
L
Linus Torvalds 已提交
1669
			return -EINVAL;
1670
		if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
L
Linus Torvalds 已提交
1671
			return -EINVAL;
1672
		if (unlikely(req->tp_frame_size < TPACKET_HDRLEN))
L
Linus Torvalds 已提交
1673
			return -EINVAL;
1674
		if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
L
Linus Torvalds 已提交
1675 1676 1677
			return -EINVAL;

		po->frames_per_block = req->tp_block_size/req->tp_frame_size;
1678
		if (unlikely(po->frames_per_block <= 0))
L
Linus Torvalds 已提交
1679
			return -EINVAL;
1680 1681
		if (unlikely((po->frames_per_block * req->tp_block_nr) !=
			     req->tp_frame_nr))
L
Linus Torvalds 已提交
1682 1683 1684
			return -EINVAL;

		err = -ENOMEM;
1685 1686 1687
		order = get_order(req->tp_block_size);
		pg_vec = alloc_pg_vec(req, order);
		if (unlikely(!pg_vec))
L
Linus Torvalds 已提交
1688 1689
			goto out;

1690
		for (i = 0; i < req->tp_block_nr; i++) {
L
Linus Torvalds 已提交
1691 1692 1693 1694
			char *ptr = pg_vec[i];
			struct tpacket_hdr *header;
			int k;

1695 1696
			for (k = 0; k < po->frames_per_block; k++) {
				header = (struct tpacket_hdr *) ptr;
L
Linus Torvalds 已提交
1697 1698 1699 1700 1701 1702
				header->tp_status = TP_STATUS_KERNEL;
				ptr += req->tp_frame_size;
			}
		}
		/* Done */
	} else {
1703
		if (unlikely(req->tp_frame_nr))
L
Linus Torvalds 已提交
1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719
			return -EINVAL;
	}

	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);
1720

L
Linus Torvalds 已提交
1721 1722 1723 1724 1725 1726 1727 1728 1729
	synchronize_net();

	err = -EBUSY;
	if (closing || atomic_read(&po->mapped) == 0) {
		err = 0;
#define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; })

		spin_lock_bh(&sk->sk_receive_queue.lock);
		pg_vec = XC(po->pg_vec, pg_vec);
1730
		po->frame_max = (req->tp_frame_nr - 1);
L
Linus Torvalds 已提交
1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783
		po->head = 0;
		po->frame_size = req->tp_frame_size;
		spin_unlock_bh(&sk->sk_receive_queue.lock);

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

		po->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
		po->prot_hook.func = po->pg_vec ? tpacket_rcv : packet_rcv;
		skb_queue_purge(&sk->sk_receive_queue);
#undef XC
		if (atomic_read(&po->mapped))
			printk(KERN_DEBUG "packet_mmap: vma is busy: %d\n", atomic_read(&po->mapped));
	}

	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;
}

static int packet_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
{
	struct sock *sk = sock->sk;
	struct packet_sock *po = pkt_sk(sk);
	unsigned long size;
	unsigned long start;
	int err = -EINVAL;
	int i;

	if (vma->vm_pgoff)
		return -EINVAL;

	size = vma->vm_end - vma->vm_start;

	lock_sock(sk);
	if (po->pg_vec == NULL)
		goto out;
	if (size != po->pg_vec_len*po->pg_vec_pages*PAGE_SIZE)
		goto out;

	start = vma->vm_start;
1784 1785 1786 1787 1788 1789 1790 1791 1792 1793
	for (i = 0; i < po->pg_vec_len; i++) {
		struct page *page = virt_to_page(po->pg_vec[i]);
		int pg_num;

		for (pg_num = 0; pg_num < po->pg_vec_pages; pg_num++, page++) {
			err = vm_insert_page(vma, start, page);
			if (unlikely(err))
				goto out;
			start += PAGE_SIZE;
		}
L
Linus Torvalds 已提交
1794
	}
1795
	atomic_inc(&po->mapped);
L
Linus Torvalds 已提交
1796 1797 1798 1799 1800 1801 1802 1803 1804 1805
	vma->vm_ops = &packet_mmap_ops;
	err = 0;

out:
	release_sock(sk);
	return err;
}
#endif


1806
static const struct proto_ops packet_ops_spkt = {
L
Linus Torvalds 已提交
1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826
	.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,
};

1827
static const struct proto_ops packet_ops = {
L
Linus Torvalds 已提交
1828 1829 1830 1831 1832 1833 1834
	.family =	PF_PACKET,
	.owner =	THIS_MODULE,
	.release =	packet_release,
	.bind =		packet_bind,
	.connect =	sock_no_connect,
	.socketpair =	sock_no_socketpair,
	.accept =	sock_no_accept,
1835
	.getname =	packet_getname,
L
Linus Torvalds 已提交
1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858
	.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
1859
static inline struct sock *packet_seq_idx(struct net *net, loff_t off)
L
Linus Torvalds 已提交
1860 1861 1862 1863
{
	struct sock *s;
	struct hlist_node *node;

1864
	sk_for_each(s, node, &net->packet.sklist) {
L
Linus Torvalds 已提交
1865 1866 1867 1868 1869 1870 1871
		if (!off--)
			return s;
	}
	return NULL;
}

static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
1872
	__acquires(seq_file_net(seq)->packet.sklist_lock)
L
Linus Torvalds 已提交
1873
{
1874
	struct net *net = seq_file_net(seq);
1875
	read_lock(&net->packet.sklist_lock);
1876
	return *pos ? packet_seq_idx(net, *pos - 1) : SEQ_START_TOKEN;
L
Linus Torvalds 已提交
1877 1878 1879 1880
}

static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
1881
	struct net *net = seq_file_net(seq);
L
Linus Torvalds 已提交
1882
	++*pos;
1883
	return  (v == SEQ_START_TOKEN)
1884
		? sk_head(&net->packet.sklist)
L
Linus Torvalds 已提交
1885 1886 1887 1888
		: sk_next((struct sock*)v) ;
}

static void packet_seq_stop(struct seq_file *seq, void *v)
1889
	__releases(seq_file_net(seq)->packet.sklist_lock)
L
Linus Torvalds 已提交
1890
{
1891
	struct net *net = seq_file_net(seq);
1892
	read_unlock(&net->packet.sklist_lock);
L
Linus Torvalds 已提交
1893 1894
}

1895
static int packet_seq_show(struct seq_file *seq, void *v)
L
Linus Torvalds 已提交
1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918
{
	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;
}

1919
static const struct seq_operations packet_seq_ops = {
L
Linus Torvalds 已提交
1920 1921 1922 1923 1924 1925 1926 1927
	.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)
{
1928 1929
	return seq_open_net(inode, file, &packet_seq_ops,
			    sizeof(struct seq_net_private));
L
Linus Torvalds 已提交
1930 1931
}

1932
static const struct file_operations packet_seq_fops = {
L
Linus Torvalds 已提交
1933 1934 1935 1936
	.owner		= THIS_MODULE,
	.open		= packet_seq_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
1937
	.release	= seq_release_net,
L
Linus Torvalds 已提交
1938 1939 1940 1941
};

#endif

1942 1943
static int packet_net_init(struct net *net)
{
1944 1945
	rwlock_init(&net->packet.sklist_lock);
	INIT_HLIST_HEAD(&net->packet.sklist);
1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963

	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
1964 1965 1966
static void __exit packet_exit(void)
{
	unregister_netdevice_notifier(&packet_netdev_notifier);
1967
	unregister_pernet_subsys(&packet_net_ops);
L
Linus Torvalds 已提交
1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979
	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);
1980
	register_pernet_subsys(&packet_net_ops);
L
Linus Torvalds 已提交
1981 1982 1983 1984 1985 1986 1987 1988 1989
	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);