af_packet.c 61.2 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 <linux/slab.h>
64
#include <linux/vmalloc.h>
65
#include <net/net_namespace.h>
L
Linus Torvalds 已提交
66 67 68 69 70 71 72 73 74 75
#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
76
#include <asm/cacheflush.h>
L
Linus Torvalds 已提交
77 78 79 80 81 82
#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>
83
#include <linux/mutex.h>
E
Eric Dumazet 已提交
84
#include <linux/if_vlan.h>
85
#include <linux/virtio_net.h>
86
#include <linux/errqueue.h>
87
#include <linux/net_tstamp.h>
L
Linus Torvalds 已提交
88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107

#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
108 109
   mac_header -> ll header
   data       -> data
L
Linus Torvalds 已提交
110 111

Outgoing, dev->hard_header!=NULL
112 113
   mac_header -> ll header
   data       -> ll header
L
Linus Torvalds 已提交
114 115

Incoming, dev->hard_header==NULL
116 117
   mac_header -> UNKNOWN position. It is very likely, that it points to ll
		 header.  PPP makes it, that is wrong, because introduce
118
		 assymetry between rx and tx paths.
119
   data       -> data
L
Linus Torvalds 已提交
120 121

Outgoing, dev->hard_header==NULL
122 123
   mac_header -> data. ll header is still not built!
   data       -> data
L
Linus Torvalds 已提交
124 125 126 127 128 129 130 131 132

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


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

dev->hard_header != NULL
133 134
   mac_header -> ll header
   data       -> ll header
L
Linus Torvalds 已提交
135 136

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

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

/* Private packet socket structures. */

E
Eric Dumazet 已提交
146
struct packet_mclist {
L
Linus Torvalds 已提交
147 148 149 150 151
	struct packet_mclist	*next;
	int			ifindex;
	int			count;
	unsigned short		type;
	unsigned short		alen;
152 153 154 155 156
	unsigned char		addr[MAX_ADDR_LEN];
};
/* identical to struct packet_mreq except it has
 * a longer address field.
 */
E
Eric Dumazet 已提交
157
struct packet_mreq_max {
158 159 160 161
	int		mr_ifindex;
	unsigned short	mr_type;
	unsigned short	mr_alen;
	unsigned char	mr_address[MAX_ADDR_LEN];
L
Linus Torvalds 已提交
162
};
163

J
Johann Baudy 已提交
164 165 166
static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
		int closing, int tx_ring);

167 168 169 170
struct pgv {
	char *buffer;
};

J
Johann Baudy 已提交
171
struct packet_ring_buffer {
172
	struct pgv		*pg_vec;
J
Johann Baudy 已提交
173 174 175 176 177 178 179 180 181 182 183 184 185 186
	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
187 188 189 190 191 192 193

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;
J
Johann Baudy 已提交
194 195
	struct packet_ring_buffer	rx_ring;
	struct packet_ring_buffer	tx_ring;
L
Linus Torvalds 已提交
196 197
	int			copy_thresh;
	spinlock_t		bind_lock;
198
	struct mutex		pg_vec_lock;
199
	unsigned int		running:1,	/* prot_hook is attached*/
200
				auxdata:1,
201 202
				origdev:1,
				has_vnet_hdr:1;
L
Linus Torvalds 已提交
203
	int			ifindex;	/* bound device		*/
A
Al Viro 已提交
204
	__be16			num;
L
Linus Torvalds 已提交
205 206
	struct packet_mclist	*mclist;
	atomic_t		mapped;
207 208
	enum tpacket_versions	tp_version;
	unsigned int		tp_hdrlen;
209
	unsigned int		tp_reserve;
J
Johann Baudy 已提交
210
	unsigned int		tp_loss:1;
211
	unsigned int		tp_tstamp;
212
	struct packet_type	prot_hook ____cacheline_aligned_in_smp;
L
Linus Torvalds 已提交
213 214
};

215 216 217 218 219 220 221 222 223
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))
224

225
static inline __pure struct page *pgv_to_page(void *addr)
226 227 228 229 230 231
{
	if (is_vmalloc_addr(addr))
		return vmalloc_to_page(addr);
	return virt_to_page(addr);
}

J
Johann Baudy 已提交
232
static void __packet_set_status(struct packet_sock *po, void *frame, int status)
L
Linus Torvalds 已提交
233
{
234 235 236 237 238
	union {
		struct tpacket_hdr *h1;
		struct tpacket2_hdr *h2;
		void *raw;
	} h;
L
Linus Torvalds 已提交
239

J
Johann Baudy 已提交
240
	h.raw = frame;
241 242
	switch (po->tp_version) {
	case TPACKET_V1:
J
Johann Baudy 已提交
243
		h.h1->tp_status = status;
244
		flush_dcache_page(pgv_to_page(&h.h1->tp_status));
245 246
		break;
	case TPACKET_V2:
J
Johann Baudy 已提交
247
		h.h2->tp_status = status;
248
		flush_dcache_page(pgv_to_page(&h.h2->tp_status));
249
		break;
J
Johann Baudy 已提交
250
	default:
E
Eric Dumazet 已提交
251
		pr_err("TPACKET version not supported\n");
J
Johann Baudy 已提交
252
		BUG();
253
	}
J
Johann Baudy 已提交
254 255

	smp_wmb();
256 257
}

J
Johann Baudy 已提交
258
static int __packet_get_status(struct packet_sock *po, void *frame)
259 260 261 262 263 264 265
{
	union {
		struct tpacket_hdr *h1;
		struct tpacket2_hdr *h2;
		void *raw;
	} h;

J
Johann Baudy 已提交
266 267
	smp_rmb();

268 269 270
	h.raw = frame;
	switch (po->tp_version) {
	case TPACKET_V1:
271
		flush_dcache_page(pgv_to_page(&h.h1->tp_status));
J
Johann Baudy 已提交
272
		return h.h1->tp_status;
273
	case TPACKET_V2:
274
		flush_dcache_page(pgv_to_page(&h.h2->tp_status));
J
Johann Baudy 已提交
275 276
		return h.h2->tp_status;
	default:
E
Eric Dumazet 已提交
277
		pr_err("TPACKET version not supported\n");
J
Johann Baudy 已提交
278 279
		BUG();
		return 0;
280
	}
L
Linus Torvalds 已提交
281
}
J
Johann Baudy 已提交
282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297

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;

298 299
	h.raw = rb->pg_vec[pg_vec_pos].buffer +
		(frame_offset * rb->frame_size);
J
Johann Baudy 已提交
300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326

	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
327 328 329 330 331 332 333
static inline struct packet_sock *pkt_sk(struct sock *sk)
{
	return (struct packet_sock *)sk;
}

static void packet_sock_destruct(struct sock *sk)
{
334 335
	skb_queue_purge(&sk->sk_error_queue);

336 337
	WARN_ON(atomic_read(&sk->sk_rmem_alloc));
	WARN_ON(atomic_read(&sk->sk_wmem_alloc));
L
Linus Torvalds 已提交
338 339

	if (!sock_flag(sk, SOCK_DEAD)) {
E
Eric Dumazet 已提交
340
		pr_err("Attempt to release alive packet socket: %p\n", sk);
L
Linus Torvalds 已提交
341 342 343
		return;
	}

344
	sk_refcnt_debug_dec(sk);
L
Linus Torvalds 已提交
345 346 347
}


348
static const struct proto_ops packet_ops;
L
Linus Torvalds 已提交
349

350
static const struct proto_ops packet_ops_spkt;
L
Linus Torvalds 已提交
351

E
Eric Dumazet 已提交
352 353
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
354 355 356 357 358 359 360 361 362 363
{
	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;
364

L
Linus Torvalds 已提交
365 366 367 368 369 370 371
	/*
	 *	Yank back the headers [hope the device set this
	 *	right or kerboom...]
	 *
	 *	Incoming packets have ll header pulled,
	 *	push it back.
	 *
372
	 *	For outgoing ones skb->data == skb_mac_header(skb)
L
Linus Torvalds 已提交
373 374 375 376 377 378
	 *	so that this procedure is noop.
	 */

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

O
Octavian Purdila 已提交
379
	if (!net_eq(dev_net(dev), sock_net(sk)))
380 381
		goto out;

E
Eric Dumazet 已提交
382 383
	skb = skb_share_check(skb, GFP_ATOMIC);
	if (skb == NULL)
L
Linus Torvalds 已提交
384 385 386
		goto oom;

	/* drop any routing info */
E
Eric Dumazet 已提交
387
	skb_dst_drop(skb);
L
Linus Torvalds 已提交
388

389 390 391
	/* drop conntrack reference */
	nf_reset(skb);

392
	spkt = &PACKET_SKB_CB(skb)->sa.pkt;
L
Linus Torvalds 已提交
393

394
	skb_push(skb, skb->data - skb_mac_header(skb));
L
Linus Torvalds 已提交
395 396 397 398 399 400 401 402 403 404 405 406 407 408

	/*
	 *	The SOCK_PACKET socket receives _all_ frames.
	 */

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

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

E
Eric Dumazet 已提交
409
	if (sock_queue_rcv_skb(sk, skb) == 0)
L
Linus Torvalds 已提交
410 411 412 413 414 415 416 417 418 419 420 421 422
		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
 */
423

L
Linus Torvalds 已提交
424 425 426 427
static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
			       struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
E
Eric Dumazet 已提交
428
	struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name;
429
	struct sk_buff *skb = NULL;
L
Linus Torvalds 已提交
430
	struct net_device *dev;
E
Eric Dumazet 已提交
431
	__be16 proto = 0;
L
Linus Torvalds 已提交
432
	int err;
433

L
Linus Torvalds 已提交
434
	/*
435
	 *	Get and verify the address.
L
Linus Torvalds 已提交
436 437
	 */

E
Eric Dumazet 已提交
438
	if (saddr) {
L
Linus Torvalds 已提交
439
		if (msg->msg_namelen < sizeof(struct sockaddr))
E
Eric Dumazet 已提交
440 441 442 443 444
			return -EINVAL;
		if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
			proto = saddr->spkt_protocol;
	} else
		return -ENOTCONN;	/* SOCK_PACKET must be sent giving an address */
L
Linus Torvalds 已提交
445 446

	/*
447
	 *	Find the device first to size check it
L
Linus Torvalds 已提交
448 449 450
	 */

	saddr->spkt_device[13] = 0;
451
retry:
E
Eric Dumazet 已提交
452 453
	rcu_read_lock();
	dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
L
Linus Torvalds 已提交
454 455 456
	err = -ENODEV;
	if (dev == NULL)
		goto out_unlock;
457

458 459 460 461
	err = -ENETDOWN;
	if (!(dev->flags & IFF_UP))
		goto out_unlock;

L
Linus Torvalds 已提交
462
	/*
E
Eric Dumazet 已提交
463 464
	 * You may not queue a frame bigger than the mtu. This is the lowest level
	 * raw protocol and you must do your own fragmentation at this level.
L
Linus Torvalds 已提交
465
	 */
466

L
Linus Torvalds 已提交
467
	err = -EMSGSIZE;
468
	if (len > dev->mtu + dev->hard_header_len)
L
Linus Torvalds 已提交
469 470
		goto out_unlock;

471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496
	if (!skb) {
		size_t reserved = LL_RESERVED_SPACE(dev);
		unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;

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

		/* Try to align data part correctly */
		if (hhlen) {
			skb->data -= hhlen;
			skb->tail -= hhlen;
			if (len < hhlen)
				skb_reset_network_header(skb);
		}
		err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
		if (err)
			goto out_free;
		goto retry;
L
Linus Torvalds 已提交
497 498
	}

499

L
Linus Torvalds 已提交
500 501 502
	skb->protocol = proto;
	skb->dev = dev;
	skb->priority = sk->sk_priority;
503
	skb->mark = sk->sk_mark;
504
	err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
505 506
	if (err < 0)
		goto out_unlock;
L
Linus Torvalds 已提交
507 508

	dev_queue_xmit(skb);
E
Eric Dumazet 已提交
509
	rcu_read_unlock();
E
Eric Dumazet 已提交
510
	return len;
L
Linus Torvalds 已提交
511 512

out_unlock:
E
Eric Dumazet 已提交
513
	rcu_read_unlock();
514 515
out_free:
	kfree_skb(skb);
L
Linus Torvalds 已提交
516 517 518
	return err;
}

E
Eric Dumazet 已提交
519 520
static inline unsigned int run_filter(const struct sk_buff *skb,
				      const struct sock *sk,
D
David S. Miller 已提交
521
				      unsigned int res)
L
Linus Torvalds 已提交
522 523
{
	struct sk_filter *filter;
524

525 526
	rcu_read_lock();
	filter = rcu_dereference(sk->sk_filter);
D
David S. Miller 已提交
527
	if (filter != NULL)
E
Eric Dumazet 已提交
528
		res = sk_run_filter(skb, filter->insns);
529
	rcu_read_unlock();
L
Linus Torvalds 已提交
530

D
David S. Miller 已提交
531
	return res;
L
Linus Torvalds 已提交
532 533 534
}

/*
E
Eric Dumazet 已提交
535 536 537 538 539 540 541 542 543
 * This function makes lazy skb cloning in hope that most of packets
 * are discarded by BPF.
 *
 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
 * and skb->cb are mangled. It works because (and until) packets
 * falling here are owned by current CPU. Output packets are cloned
 * by dev_queue_xmit_nit(), input packets are processed by net_bh
 * sequencially, so that if we return skb to original state on exit,
 * we will not harm anyone.
L
Linus Torvalds 已提交
544 545
 */

E
Eric Dumazet 已提交
546 547
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
548 549 550 551
{
	struct sock *sk;
	struct sockaddr_ll *sll;
	struct packet_sock *po;
E
Eric Dumazet 已提交
552
	u8 *skb_head = skb->data;
L
Linus Torvalds 已提交
553
	int skb_len = skb->len;
D
David S. Miller 已提交
554
	unsigned int snaplen, res;
L
Linus Torvalds 已提交
555 556 557 558 559 560 561

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

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

O
Octavian Purdila 已提交
562
	if (!net_eq(dev_net(dev), sock_net(sk)))
563 564
		goto drop;

L
Linus Torvalds 已提交
565 566
	skb->dev = dev;

567
	if (dev->header_ops) {
L
Linus Torvalds 已提交
568
		/* The device has an explicit notion of ll header,
E
Eric Dumazet 已提交
569 570 571 572 573
		 * exported to higher levels.
		 *
		 * Otherwise, the device hides details of its frame
		 * structure, so that corresponding packet head is
		 * never delivered to user.
L
Linus Torvalds 已提交
574 575
		 */
		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
		}
	}

	snaplen = skb->len;

D
David S. Miller 已提交
585 586
	res = run_filter(skb, sk, snaplen);
	if (!res)
587
		goto drop_n_restore;
D
David S. Miller 已提交
588 589
	if (snaplen > res)
		snaplen = res;
L
Linus Torvalds 已提交
590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607

	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;
	}

608 609 610 611
	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
612 613 614 615
	sll->sll_family = AF_PACKET;
	sll->sll_hatype = dev->type;
	sll->sll_protocol = skb->protocol;
	sll->sll_pkttype = skb->pkt_type;
616
	if (unlikely(po->origdev))
617 618 619
		sll->sll_ifindex = orig_dev->ifindex;
	else
		sll->sll_ifindex = dev->ifindex;
L
Linus Torvalds 已提交
620

S
Stephen Hemminger 已提交
621
	sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
L
Linus Torvalds 已提交
622

623
	PACKET_SKB_CB(skb)->origlen = skb->len;
624

L
Linus Torvalds 已提交
625 626 627 628 629
	if (pskb_trim(skb, snaplen))
		goto drop_n_acct;

	skb_set_owner_r(skb, sk);
	skb->dev = NULL;
E
Eric Dumazet 已提交
630
	skb_dst_drop(skb);
L
Linus Torvalds 已提交
631

632 633 634
	/* drop conntrack reference */
	nf_reset(skb);

L
Linus Torvalds 已提交
635 636
	spin_lock(&sk->sk_receive_queue.lock);
	po->stats.tp_packets++;
637
	skb->dropcount = atomic_read(&sk->sk_drops);
L
Linus Torvalds 已提交
638 639 640 641 642 643
	__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:
644
	po->stats.tp_drops = atomic_inc_return(&sk->sk_drops);
L
Linus Torvalds 已提交
645 646 647 648 649 650 651

drop_n_restore:
	if (skb_head != skb->data && skb_shared(skb)) {
		skb->data = skb_head;
		skb->len = skb_len;
	}
drop:
652
	consume_skb(skb);
L
Linus Torvalds 已提交
653 654 655
	return 0;
}

E
Eric Dumazet 已提交
656 657
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
658 659 660 661
{
	struct sock *sk;
	struct packet_sock *po;
	struct sockaddr_ll *sll;
662 663 664 665 666
	union {
		struct tpacket_hdr *h1;
		struct tpacket2_hdr *h2;
		void *raw;
	} h;
E
Eric Dumazet 已提交
667
	u8 *skb_head = skb->data;
L
Linus Torvalds 已提交
668
	int skb_len = skb->len;
D
David S. Miller 已提交
669
	unsigned int snaplen, res;
L
Linus Torvalds 已提交
670
	unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
671
	unsigned short macoff, netoff, hdrlen;
L
Linus Torvalds 已提交
672
	struct sk_buff *copy_skb = NULL;
673
	struct timeval tv;
674
	struct timespec ts;
675
	struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
L
Linus Torvalds 已提交
676 677 678 679 680 681 682

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

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

O
Octavian Purdila 已提交
683
	if (!net_eq(dev_net(dev), sock_net(sk)))
684 685
		goto drop;

686
	if (dev->header_ops) {
L
Linus Torvalds 已提交
687
		if (sk->sk_type != SOCK_DGRAM)
688
			skb_push(skb, skb->data - skb_mac_header(skb));
L
Linus Torvalds 已提交
689 690
		else if (skb->pkt_type == PACKET_OUTGOING) {
			/* Special case: outgoing packets have ll header at head */
691
			skb_pull(skb, skb_network_offset(skb));
L
Linus Torvalds 已提交
692 693 694
		}
	}

695 696 697
	if (skb->ip_summed == CHECKSUM_PARTIAL)
		status |= TP_STATUS_CSUMNOTREADY;

L
Linus Torvalds 已提交
698 699
	snaplen = skb->len;

D
David S. Miller 已提交
700 701
	res = run_filter(skb, sk, snaplen);
	if (!res)
702
		goto drop_n_restore;
D
David S. Miller 已提交
703 704
	if (snaplen > res)
		snaplen = res;
L
Linus Torvalds 已提交
705 706

	if (sk->sk_type == SOCK_DGRAM) {
707 708
		macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
				  po->tp_reserve;
L
Linus Torvalds 已提交
709
	} else {
710
		unsigned maclen = skb_network_offset(skb);
711
		netoff = TPACKET_ALIGN(po->tp_hdrlen +
712 713
				       (maclen < 16 ? 16 : maclen)) +
			po->tp_reserve;
L
Linus Torvalds 已提交
714 715 716
		macoff = netoff - maclen;
	}

J
Johann Baudy 已提交
717
	if (macoff + snaplen > po->rx_ring.frame_size) {
L
Linus Torvalds 已提交
718 719 720 721 722 723 724 725 726 727 728 729
		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
730
		snaplen = po->rx_ring.frame_size - macoff;
L
Linus Torvalds 已提交
731 732 733 734 735
		if ((int)snaplen < 0)
			snaplen = 0;
	}

	spin_lock(&sk->sk_receive_queue.lock);
J
Johann Baudy 已提交
736
	h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL);
737
	if (!h.raw)
L
Linus Torvalds 已提交
738
		goto ring_is_full;
J
Johann Baudy 已提交
739
	packet_increment_head(&po->rx_ring);
L
Linus Torvalds 已提交
740 741 742 743 744 745 746 747 748
	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);

749
	skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
L
Linus Torvalds 已提交
750

751 752 753 754 755 756
	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;
757 758 759 760 761 762 763
		if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
				&& shhwtstamps->syststamp.tv64)
			tv = ktime_to_timeval(shhwtstamps->syststamp);
		else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
				&& shhwtstamps->hwtstamp.tv64)
			tv = ktime_to_timeval(shhwtstamps->hwtstamp);
		else if (skb->tstamp.tv64)
764 765 766 767 768 769 770 771 772 773 774 775
			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;
776 777 778 779 780 781 782
		if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
				&& shhwtstamps->syststamp.tv64)
			ts = ktime_to_timespec(shhwtstamps->syststamp);
		else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
				&& shhwtstamps->hwtstamp.tv64)
			ts = ktime_to_timespec(shhwtstamps->hwtstamp);
		else if (skb->tstamp.tv64)
783 784 785 786 787
			ts = ktime_to_timespec(skb->tstamp);
		else
			getnstimeofday(&ts);
		h.h2->tp_sec = ts.tv_sec;
		h.h2->tp_nsec = ts.tv_nsec;
E
Eric Dumazet 已提交
788
		h.h2->tp_vlan_tci = vlan_tx_tag_get(skb);
789 790 791 792 793
		hdrlen = sizeof(*h.h2);
		break;
	default:
		BUG();
	}
L
Linus Torvalds 已提交
794

795
	sll = h.raw + TPACKET_ALIGN(hdrlen);
S
Stephen Hemminger 已提交
796
	sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
L
Linus Torvalds 已提交
797 798 799 800
	sll->sll_family = AF_PACKET;
	sll->sll_hatype = dev->type;
	sll->sll_protocol = skb->protocol;
	sll->sll_pkttype = skb->pkt_type;
801
	if (unlikely(po->origdev))
802 803 804
		sll->sll_ifindex = orig_dev->ifindex;
	else
		sll->sll_ifindex = dev->ifindex;
L
Linus Torvalds 已提交
805

806
	__packet_set_status(po, h.raw, status);
R
Ralf Baechle 已提交
807
	smp_mb();
808
#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
L
Linus Torvalds 已提交
809
	{
810 811 812 813 814
		u8 *start, *end;

		end = (u8 *)PAGE_ALIGN((unsigned long)h.raw + macoff + snaplen);
		for (start = h.raw; start < end; start += PAGE_SIZE)
			flush_dcache_page(pgv_to_page(start));
L
Linus Torvalds 已提交
815
	}
816
#endif
L
Linus Torvalds 已提交
817 818 819 820 821 822 823 824 825

	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:
826
	kfree_skb(skb);
L
Linus Torvalds 已提交
827 828 829 830 831 832 833
	return 0;

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

	sk->sk_data_ready(sk, 0);
834
	kfree_skb(copy_skb);
L
Linus Torvalds 已提交
835 836 837
	goto drop_n_restore;
}

J
Johann Baudy 已提交
838 839 840
static void tpacket_destruct_skb(struct sk_buff *skb)
{
	struct packet_sock *po = pkt_sk(skb->sk);
E
Eric Dumazet 已提交
841
	void *ph;
L
Linus Torvalds 已提交
842

J
Johann Baudy 已提交
843
	BUG_ON(skb == NULL);
L
Linus Torvalds 已提交
844

J
Johann Baudy 已提交
845 846 847 848 849 850 851 852 853 854 855
	if (likely(po->tx_ring.pg_vec)) {
		ph = skb_shinfo(skb)->destructor_arg;
		BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING);
		BUG_ON(atomic_read(&po->tx_ring.pending) == 0);
		atomic_dec(&po->tx_ring.pending);
		__packet_set_status(po, ph, TP_STATUS_AVAILABLE);
	}

	sock_wfree(skb);
}

E
Eric Dumazet 已提交
856 857 858
static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
		void *frame, struct net_device *dev, int size_max,
		__be16 proto, unsigned char *addr)
J
Johann Baudy 已提交
859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875
{
	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;
876
	skb->mark = po->sk.sk_mark;
J
Johann Baudy 已提交
877 878 879 880 881 882 883 884 885 886 887
	skb_shinfo(skb)->destructor_arg = ph.raw;

	switch (po->tp_version) {
	case TPACKET_V2:
		tp_len = ph.h2->tp_len;
		break;
	default:
		tp_len = ph.h1->tp_len;
		break;
	}
	if (unlikely(tp_len > size_max)) {
E
Eric Dumazet 已提交
888
		pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
J
Johann Baudy 已提交
889 890 891 892 893 894 895 896 897 898 899 900 901 902
		return -EMSGSIZE;
	}

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

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

	if (sock->type == SOCK_DGRAM) {
		err = dev_hard_header(skb, dev, ntohs(proto), addr,
				NULL, tp_len);
		if (unlikely(err < 0))
			return -EINVAL;
E
Eric Dumazet 已提交
903
	} else if (dev->hard_header_len) {
J
Johann Baudy 已提交
904 905
		/* net device doesn't like empty head */
		if (unlikely(tp_len <= dev->hard_header_len)) {
E
Eric Dumazet 已提交
906 907
			pr_err("packet size is too short (%d < %d)\n",
			       tp_len, dev->hard_header_len);
J
Johann Baudy 已提交
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
			return -EINVAL;
		}

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

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

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

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

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

		if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
E
Eric Dumazet 已提交
935 936
			pr_err("Packet exceed the number of skb frags(%lu)\n",
			       MAX_SKB_FRAGS);
J
Johann Baudy 已提交
937 938 939
			return -EFAULT;
		}

940 941
		page = pgv_to_page(data);
		data += len;
J
Johann Baudy 已提交
942 943
		flush_dcache_page(page);
		get_page(page);
944
		skb_fill_page_desc(skb, nr_frags, page, offset, len);
J
Johann Baudy 已提交
945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960
		to_write -= len;
		offset = 0;
		len_max = PAGE_SIZE;
		len = ((to_write > len_max) ? len_max : to_write);
	}

	return tp_len;
}

static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
{
	struct socket *sock;
	struct sk_buff *skb;
	struct net_device *dev;
	__be16 proto;
	int ifindex, err, reserve = 0;
E
Eric Dumazet 已提交
961 962
	void *ph;
	struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
J
Johann Baudy 已提交
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
	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
1002
		- (po->tp_hdrlen - sizeof(struct sockaddr_ll));
J
Johann Baudy 已提交
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

	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);
1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061
		if (unlikely(err > 0)) {
			err = net_xmit_errno(err);
			if (err && __packet_get_status(po, ph) ==
				   TP_STATUS_AVAILABLE) {
				/* skb was destructed already */
				skb = NULL;
				goto out_status;
			}
			/*
			 * skb was dropped but not destructed yet;
			 * let's treat it like congestion or err < 0
			 */
			err = 0;
		}
J
Johann Baudy 已提交
1062 1063
		packet_increment_head(&po->tx_ring);
		len_sum += tp_len;
1064 1065 1066 1067
	} while (likely((ph != NULL) ||
			((!(msg->msg_flags & MSG_DONTWAIT)) &&
			 (atomic_read(&po->tx_ring.pending))))
		);
J
Johann Baudy 已提交
1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081

	err = len_sum;
	goto out_put;

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

1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105
static inline struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
					       size_t reserve, size_t len,
					       size_t linear, int noblock,
					       int *err)
{
	struct sk_buff *skb;

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

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

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

	return skb;
}

J
Johann Baudy 已提交
1106
static int packet_snd(struct socket *sock,
L
Linus Torvalds 已提交
1107 1108 1109
			  struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
E
Eric Dumazet 已提交
1110
	struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
L
Linus Torvalds 已提交
1111 1112
	struct sk_buff *skb;
	struct net_device *dev;
A
Al Viro 已提交
1113
	__be16 proto;
L
Linus Torvalds 已提交
1114 1115
	unsigned char *addr;
	int ifindex, err, reserve = 0;
1116 1117 1118 1119 1120
	struct virtio_net_hdr vnet_hdr = { 0 };
	int offset = 0;
	int vnet_hdr_len;
	struct packet_sock *po = pkt_sk(sk);
	unsigned short gso_type = 0;
L
Linus Torvalds 已提交
1121 1122

	/*
1123
	 *	Get and verify the address.
L
Linus Torvalds 已提交
1124
	 */
1125

L
Linus Torvalds 已提交
1126 1127 1128 1129 1130 1131 1132 1133
	if (saddr == NULL) {
		ifindex	= po->ifindex;
		proto	= po->num;
		addr	= NULL;
	} else {
		err = -EINVAL;
		if (msg->msg_namelen < sizeof(struct sockaddr_ll))
			goto out;
1134 1135
		if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
			goto out;
L
Linus Torvalds 已提交
1136 1137 1138 1139 1140 1141
		ifindex	= saddr->sll_ifindex;
		proto	= saddr->sll_protocol;
		addr	= saddr->sll_addr;
	}


1142
	dev = dev_get_by_index(sock_net(sk), ifindex);
L
Linus Torvalds 已提交
1143 1144 1145 1146 1147 1148
	err = -ENXIO;
	if (dev == NULL)
		goto out_unlock;
	if (sock->type == SOCK_RAW)
		reserve = dev->hard_header_len;

1149 1150 1151 1152
	err = -ENETDOWN;
	if (!(dev->flags & IFF_UP))
		goto out_unlock;

1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 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
	if (po->has_vnet_hdr) {
		vnet_hdr_len = sizeof(vnet_hdr);

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

		len -= vnet_hdr_len;

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

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

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

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

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

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

		}
	}

L
Linus Torvalds 已提交
1201
	err = -EMSGSIZE;
1202
	if (!gso_type && (len > dev->mtu+reserve))
L
Linus Torvalds 已提交
1203 1204
		goto out_unlock;

1205 1206 1207 1208
	err = -ENOBUFS;
	skb = packet_alloc_skb(sk, LL_ALLOCATED_SPACE(dev),
			       LL_RESERVED_SPACE(dev), len, vnet_hdr.hdr_len,
			       msg->msg_flags & MSG_DONTWAIT, &err);
E
Eric Dumazet 已提交
1209
	if (skb == NULL)
L
Linus Torvalds 已提交
1210 1211
		goto out_unlock;

1212
	skb_set_network_header(skb, reserve);
L
Linus Torvalds 已提交
1213

1214 1215
	err = -EINVAL;
	if (sock->type == SOCK_DGRAM &&
1216
	    (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0)
1217
		goto out_free;
L
Linus Torvalds 已提交
1218 1219

	/* Returns -EFAULT on error */
1220
	err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len);
L
Linus Torvalds 已提交
1221 1222
	if (err)
		goto out_free;
1223
	err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
1224 1225
	if (err < 0)
		goto out_free;
L
Linus Torvalds 已提交
1226 1227 1228 1229

	skb->protocol = proto;
	skb->dev = dev;
	skb->priority = sk->sk_priority;
1230
	skb->mark = sk->sk_mark;
L
Linus Torvalds 已提交
1231

1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250
	if (po->has_vnet_hdr) {
		if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
			if (!skb_partial_csum_set(skb, vnet_hdr.csum_start,
						  vnet_hdr.csum_offset)) {
				err = -EINVAL;
				goto out_free;
			}
		}

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

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

		len += vnet_hdr_len;
	}

L
Linus Torvalds 已提交
1251 1252 1253 1254 1255 1256 1257 1258 1259 1260
	/*
	 *	Now send it
	 */

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

	dev_put(dev);

E
Eric Dumazet 已提交
1261
	return len;
L
Linus Torvalds 已提交
1262 1263 1264 1265 1266 1267 1268 1269 1270 1271

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

J
Johann Baudy 已提交
1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282
static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
		struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
	struct packet_sock *po = pkt_sk(sk);
	if (po->tx_ring.pg_vec)
		return tpacket_snd(po, msg);
	else
		return packet_snd(sock, msg, len);
}

L
Linus Torvalds 已提交
1283 1284 1285 1286 1287 1288 1289 1290 1291
/*
 *	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;
1292
	struct net *net;
J
Johann Baudy 已提交
1293
	struct tpacket_req req;
L
Linus Torvalds 已提交
1294 1295 1296 1297

	if (!sk)
		return 0;

1298
	net = sock_net(sk);
L
Linus Torvalds 已提交
1299 1300
	po = pkt_sk(sk);

1301 1302
	spin_lock_bh(&net->packet.sklist_lock);
	sk_del_node_init_rcu(sk);
1303
	sock_prot_inuse_add(net, sk->sk_prot, -1);
1304
	spin_unlock_bh(&net->packet.sklist_lock);
L
Linus Torvalds 已提交
1305

1306
	spin_lock(&po->bind_lock);
L
Linus Torvalds 已提交
1307 1308
	if (po->running) {
		/*
1309
		 * Remove from protocol table
L
Linus Torvalds 已提交
1310 1311 1312
		 */
		po->running = 0;
		po->num = 0;
1313
		__dev_remove_pack(&po->prot_hook);
L
Linus Torvalds 已提交
1314 1315
		__sock_put(sk);
	}
1316
	spin_unlock(&po->bind_lock);
L
Linus Torvalds 已提交
1317 1318 1319

	packet_flush_mclist(sk);

J
Johann Baudy 已提交
1320 1321 1322 1323 1324 1325 1326
	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
1327

1328
	synchronize_net();
L
Linus Torvalds 已提交
1329 1330 1331 1332 1333 1334 1335 1336 1337
	/*
	 *	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);
1338
	sk_refcnt_debug_release(sk);
L
Linus Torvalds 已提交
1339 1340 1341 1342 1343 1344 1345 1346 1347

	sock_put(sk);
	return 0;
}

/*
 *	Attach a packet hook.
 */

A
Al Viro 已提交
1348
static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
L
Linus Torvalds 已提交
1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375
{
	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;

1376
	if (!dev || (dev->flags & IFF_UP)) {
L
Linus Torvalds 已提交
1377 1378 1379
		dev_add_pack(&po->prot_hook);
		sock_hold(sk);
		po->running = 1;
1380 1381 1382 1383
	} else {
		sk->sk_err = ENETDOWN;
		if (!sock_flag(sk, SOCK_DEAD))
			sk->sk_error_report(sk);
L
Linus Torvalds 已提交
1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395
	}

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

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

E
Eric Dumazet 已提交
1396 1397
static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
			    int addr_len)
L
Linus Torvalds 已提交
1398
{
E
Eric Dumazet 已提交
1399
	struct sock *sk = sock->sk;
L
Linus Torvalds 已提交
1400 1401 1402
	char name[15];
	struct net_device *dev;
	int err = -ENODEV;
1403

L
Linus Torvalds 已提交
1404 1405 1406
	/*
	 *	Check legality
	 */
1407

1408
	if (addr_len != sizeof(struct sockaddr))
L
Linus Torvalds 已提交
1409
		return -EINVAL;
E
Eric Dumazet 已提交
1410
	strlcpy(name, uaddr->sa_data, sizeof(name));
L
Linus Torvalds 已提交
1411

1412
	dev = dev_get_by_name(sock_net(sk), name);
L
Linus Torvalds 已提交
1413 1414 1415 1416 1417 1418 1419 1420 1421
	if (dev) {
		err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
		dev_put(dev);
	}
	return err;
}

static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
E
Eric Dumazet 已提交
1422 1423
	struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
	struct sock *sk = sock->sk;
L
Linus Torvalds 已提交
1424 1425 1426 1427 1428 1429 1430
	struct net_device *dev = NULL;
	int err;


	/*
	 *	Check legality
	 */
1431

L
Linus Torvalds 已提交
1432 1433 1434 1435 1436 1437 1438
	if (addr_len < sizeof(struct sockaddr_ll))
		return -EINVAL;
	if (sll->sll_family != AF_PACKET)
		return -EINVAL;

	if (sll->sll_ifindex) {
		err = -ENODEV;
1439
		dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
L
Linus Torvalds 已提交
1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457
		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),
};

/*
1458
 *	Create a packet of type SOCK_PACKET.
L
Linus Torvalds 已提交
1459 1460
 */

1461 1462
static int packet_create(struct net *net, struct socket *sock, int protocol,
			 int kern)
L
Linus Torvalds 已提交
1463 1464 1465
{
	struct sock *sk;
	struct packet_sock *po;
A
Al Viro 已提交
1466
	__be16 proto = (__force __be16)protocol; /* weird, but documented */
L
Linus Torvalds 已提交
1467 1468 1469 1470
	int err;

	if (!capable(CAP_NET_RAW))
		return -EPERM;
1471 1472
	if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
	    sock->type != SOCK_PACKET)
L
Linus Torvalds 已提交
1473 1474 1475 1476 1477
		return -ESOCKTNOSUPPORT;

	sock->state = SS_UNCONNECTED;

	err = -ENOBUFS;
1478
	sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
L
Linus Torvalds 已提交
1479 1480 1481 1482 1483 1484
	if (sk == NULL)
		goto out;

	sock->ops = &packet_ops;
	if (sock->type == SOCK_PACKET)
		sock->ops = &packet_ops_spkt;
1485

L
Linus Torvalds 已提交
1486 1487 1488 1489
	sock_init_data(sock, sk);

	po = pkt_sk(sk);
	sk->sk_family = PF_PACKET;
A
Al Viro 已提交
1490
	po->num = proto;
L
Linus Torvalds 已提交
1491 1492

	sk->sk_destruct = packet_sock_destruct;
1493
	sk_refcnt_debug_inc(sk);
L
Linus Torvalds 已提交
1494 1495 1496 1497 1498 1499

	/*
	 *	Attach a protocol block
	 */

	spin_lock_init(&po->bind_lock);
1500
	mutex_init(&po->pg_vec_lock);
L
Linus Torvalds 已提交
1501
	po->prot_hook.func = packet_rcv;
1502

L
Linus Torvalds 已提交
1503 1504
	if (sock->type == SOCK_PACKET)
		po->prot_hook.func = packet_rcv_spkt;
1505

L
Linus Torvalds 已提交
1506 1507
	po->prot_hook.af_packet_priv = sk;

A
Al Viro 已提交
1508 1509
	if (proto) {
		po->prot_hook.type = proto;
L
Linus Torvalds 已提交
1510 1511 1512 1513 1514
		dev_add_pack(&po->prot_hook);
		sock_hold(sk);
		po->running = 1;
	}

1515 1516
	spin_lock_bh(&net->packet.sklist_lock);
	sk_add_node_rcu(sk, &net->packet.sklist);
1517
	sock_prot_inuse_add(net, &packet_proto, 1);
1518 1519
	spin_unlock_bh(&net->packet.sklist_lock);

E
Eric Dumazet 已提交
1520
	return 0;
L
Linus Torvalds 已提交
1521 1522 1523 1524
out:
	return err;
}

1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569
static int packet_recv_error(struct sock *sk, struct msghdr *msg, int len)
{
	struct sock_exterr_skb *serr;
	struct sk_buff *skb, *skb2;
	int copied, err;

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

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

	sock_recv_timestamp(msg, sk, skb);

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

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

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

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

L
Linus Torvalds 已提交
1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580
/*
 *	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;
1581
	struct sockaddr_ll *sll;
1582
	int vnet_hdr_len = 0;
L
Linus Torvalds 已提交
1583 1584

	err = -EINVAL;
1585
	if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
L
Linus Torvalds 已提交
1586 1587 1588 1589 1590 1591 1592 1593
		goto out;

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

1594 1595 1596 1597 1598
	if (flags & MSG_ERRQUEUE) {
		err = packet_recv_error(sk, msg, len);
		goto out;
	}

L
Linus Torvalds 已提交
1599 1600 1601 1602 1603 1604 1605 1606 1607
	/*
	 *	Call the generic datagram receiver. This handles all sorts
	 *	of horrible races and re-entrancy so we can forget about it
	 *	in the protocol layers.
	 *
	 *	Now it will return ENETDOWN, if device have just gone down,
	 *	but then it will block.
	 */

E
Eric Dumazet 已提交
1608
	skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
L
Linus Torvalds 已提交
1609 1610

	/*
1611
	 *	An error occurred so return it. Because skb_recv_datagram()
L
Linus Torvalds 已提交
1612 1613 1614 1615
	 *	handles the blocking we don't see and worry about blocking
	 *	retries.
	 */

1616
	if (skb == NULL)
L
Linus Torvalds 已提交
1617 1618
		goto out;

1619 1620 1621 1622 1623
	if (pkt_sk(sk)->has_vnet_hdr) {
		struct virtio_net_hdr vnet_hdr = { 0 };

		err = -EINVAL;
		vnet_hdr_len = sizeof(vnet_hdr);
1624
		if (len < vnet_hdr_len)
1625 1626
			goto out_free;

1627 1628
		len -= vnet_hdr_len;

1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651
		if (skb_is_gso(skb)) {
			struct skb_shared_info *sinfo = skb_shinfo(skb);

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

		if (skb->ip_summed == CHECKSUM_PARTIAL) {
			vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
1652
			vnet_hdr.csum_start = skb_checksum_start_offset(skb);
1653 1654 1655 1656 1657 1658 1659 1660 1661
			vnet_hdr.csum_offset = skb->csum_offset;
		} /* else everything is zero */

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

1662 1663 1664 1665 1666
	/*
	 *	If the address length field is there to be filled in, we fill
	 *	it in now.
	 */

1667
	sll = &PACKET_SKB_CB(skb)->sa.ll;
1668 1669 1670 1671 1672
	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
1673 1674 1675 1676 1677 1678
	/*
	 *	You lose any data beyond the buffer you gave. If it worries a
	 *	user program they can ask the device for its MTU anyway.
	 */

	copied = skb->len;
E
Eric Dumazet 已提交
1679 1680 1681
	if (copied > len) {
		copied = len;
		msg->msg_flags |= MSG_TRUNC;
L
Linus Torvalds 已提交
1682 1683 1684 1685 1686 1687
	}

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

1688
	sock_recv_ts_and_drops(msg, sk, skb);
L
Linus Torvalds 已提交
1689 1690

	if (msg->msg_name)
1691 1692
		memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
		       msg->msg_namelen);
L
Linus Torvalds 已提交
1693

1694
	if (pkt_sk(sk)->auxdata) {
1695 1696 1697 1698 1699 1700 1701 1702
		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;
1703
		aux.tp_net = skb_network_offset(skb);
E
Eric Dumazet 已提交
1704
		aux.tp_vlan_tci = vlan_tx_tag_get(skb);
1705 1706

		put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
1707 1708
	}

L
Linus Torvalds 已提交
1709 1710 1711 1712
	/*
	 *	Free or return the buffer as appropriate. Again this
	 *	hides all the races and re-entrancy issues from us.
	 */
1713
	err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
L
Linus Torvalds 已提交
1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730

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

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

	if (peer)
		return -EOPNOTSUPP;

	uaddr->sa_family = AF_PACKET;
E
Eric Dumazet 已提交
1731 1732 1733
	rcu_read_lock();
	dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
	if (dev)
1734
		strncpy(uaddr->sa_data, dev->name, 14);
E
Eric Dumazet 已提交
1735
	else
L
Linus Torvalds 已提交
1736
		memset(uaddr->sa_data, 0, 14);
E
Eric Dumazet 已提交
1737
	rcu_read_unlock();
L
Linus Torvalds 已提交
1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748
	*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);
1749
	DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
L
Linus Torvalds 已提交
1750 1751 1752 1753 1754 1755 1756

	if (peer)
		return -EOPNOTSUPP;

	sll->sll_family = AF_PACKET;
	sll->sll_ifindex = po->ifindex;
	sll->sll_protocol = po->num;
1757
	sll->sll_pkttype = 0;
E
Eric Dumazet 已提交
1758 1759
	rcu_read_lock();
	dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
L
Linus Torvalds 已提交
1760 1761 1762 1763 1764 1765 1766 1767
	if (dev) {
		sll->sll_hatype = dev->type;
		sll->sll_halen = dev->addr_len;
		memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
	} else {
		sll->sll_hatype = 0;	/* Bad: we have no ARPHRD_UNSPEC */
		sll->sll_halen = 0;
	}
E
Eric Dumazet 已提交
1768
	rcu_read_unlock();
1769
	*uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
L
Linus Torvalds 已提交
1770 1771 1772 1773

	return 0;
}

1774 1775
static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
			 int what)
L
Linus Torvalds 已提交
1776 1777 1778
{
	switch (i->type) {
	case PACKET_MR_MULTICAST:
1779 1780
		if (i->alen != dev->addr_len)
			return -EINVAL;
L
Linus Torvalds 已提交
1781
		if (what > 0)
1782
			return dev_mc_add(dev, i->addr);
L
Linus Torvalds 已提交
1783
		else
1784
			return dev_mc_del(dev, i->addr);
L
Linus Torvalds 已提交
1785 1786
		break;
	case PACKET_MR_PROMISC:
1787
		return dev_set_promiscuity(dev, what);
L
Linus Torvalds 已提交
1788 1789
		break;
	case PACKET_MR_ALLMULTI:
1790
		return dev_set_allmulti(dev, what);
L
Linus Torvalds 已提交
1791
		break;
1792
	case PACKET_MR_UNICAST:
1793 1794
		if (i->alen != dev->addr_len)
			return -EINVAL;
1795
		if (what > 0)
1796
			return dev_uc_add(dev, i->addr);
1797
		else
1798
			return dev_uc_del(dev, i->addr);
1799
		break;
E
Eric Dumazet 已提交
1800 1801
	default:
		break;
L
Linus Torvalds 已提交
1802
	}
1803
	return 0;
L
Linus Torvalds 已提交
1804 1805 1806 1807
}

static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
{
E
Eric Dumazet 已提交
1808
	for ( ; i; i = i->next) {
L
Linus Torvalds 已提交
1809 1810 1811 1812 1813
		if (i->ifindex == dev->ifindex)
			packet_dev_mc(dev, i, what);
	}
}

1814
static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
L
Linus Torvalds 已提交
1815 1816 1817 1818 1819 1820 1821 1822 1823
{
	struct packet_sock *po = pkt_sk(sk);
	struct packet_mclist *ml, *i;
	struct net_device *dev;
	int err;

	rtnl_lock();

	err = -ENODEV;
1824
	dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
L
Linus Torvalds 已提交
1825 1826 1827 1828
	if (!dev)
		goto done;

	err = -EINVAL;
1829
	if (mreq->mr_alen > dev->addr_len)
L
Linus Torvalds 已提交
1830 1831 1832
		goto done;

	err = -ENOBUFS;
1833
	i = kmalloc(sizeof(*i), GFP_KERNEL);
L
Linus Torvalds 已提交
1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856
	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;
1857 1858 1859 1860 1861
	err = packet_dev_mc(dev, i, 1);
	if (err) {
		po->mclist = i->next;
		kfree(i);
	}
L
Linus Torvalds 已提交
1862 1863 1864 1865 1866 1867

done:
	rtnl_unlock();
	return err;
}

1868
static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
L
Linus Torvalds 已提交
1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881
{
	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;
1882 1883
				dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
				if (dev)
L
Linus Torvalds 已提交
1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907
					packet_dev_mc(dev, ml, -1);
				kfree(ml);
			}
			rtnl_unlock();
			return 0;
		}
	}
	rtnl_unlock();
	return -EADDRNOTAVAIL;
}

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

	if (!po->mclist)
		return;

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

		po->mclist = ml->next;
1908 1909
		dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
		if (dev != NULL)
L
Linus Torvalds 已提交
1910 1911 1912 1913 1914 1915 1916
			packet_dev_mc(dev, ml, -1);
		kfree(ml);
	}
	rtnl_unlock();
}

static int
1917
packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
L
Linus Torvalds 已提交
1918 1919
{
	struct sock *sk = sock->sk;
1920
	struct packet_sock *po = pkt_sk(sk);
L
Linus Torvalds 已提交
1921 1922 1923 1924 1925
	int ret;

	if (level != SOL_PACKET)
		return -ENOPROTOOPT;

J
Johann Baudy 已提交
1926
	switch (optname) {
1927
	case PACKET_ADD_MEMBERSHIP:
L
Linus Torvalds 已提交
1928 1929
	case PACKET_DROP_MEMBERSHIP:
	{
1930 1931 1932 1933
		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
1934
			return -EINVAL;
1935 1936
		if (len > sizeof(mreq))
			len = sizeof(mreq);
E
Eric Dumazet 已提交
1937
		if (copy_from_user(&mreq, optval, len))
L
Linus Torvalds 已提交
1938
			return -EFAULT;
1939 1940
		if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
			return -EINVAL;
L
Linus Torvalds 已提交
1941 1942 1943 1944 1945 1946
		if (optname == PACKET_ADD_MEMBERSHIP)
			ret = packet_mc_add(sk, &mreq);
		else
			ret = packet_mc_drop(sk, &mreq);
		return ret;
	}
1947

L
Linus Torvalds 已提交
1948
	case PACKET_RX_RING:
J
Johann Baudy 已提交
1949
	case PACKET_TX_RING:
L
Linus Torvalds 已提交
1950 1951 1952
	{
		struct tpacket_req req;

E
Eric Dumazet 已提交
1953
		if (optlen < sizeof(req))
L
Linus Torvalds 已提交
1954
			return -EINVAL;
1955 1956
		if (pkt_sk(sk)->has_vnet_hdr)
			return -EINVAL;
E
Eric Dumazet 已提交
1957
		if (copy_from_user(&req, optval, sizeof(req)))
L
Linus Torvalds 已提交
1958
			return -EFAULT;
J
Johann Baudy 已提交
1959
		return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING);
L
Linus Torvalds 已提交
1960 1961 1962 1963 1964
	}
	case PACKET_COPY_THRESH:
	{
		int val;

E
Eric Dumazet 已提交
1965
		if (optlen != sizeof(val))
L
Linus Torvalds 已提交
1966
			return -EINVAL;
E
Eric Dumazet 已提交
1967
		if (copy_from_user(&val, optval, sizeof(val)))
L
Linus Torvalds 已提交
1968 1969 1970 1971 1972
			return -EFAULT;

		pkt_sk(sk)->copy_thresh = val;
		return 0;
	}
1973 1974 1975 1976 1977 1978
	case PACKET_VERSION:
	{
		int val;

		if (optlen != sizeof(val))
			return -EINVAL;
J
Johann Baudy 已提交
1979
		if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991
			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;
		}
	}
1992 1993 1994 1995 1996 1997
	case PACKET_RESERVE:
	{
		unsigned int val;

		if (optlen != sizeof(val))
			return -EINVAL;
J
Johann Baudy 已提交
1998
		if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1999 2000 2001 2002 2003 2004
			return -EBUSY;
		if (copy_from_user(&val, optval, sizeof(val)))
			return -EFAULT;
		po->tp_reserve = val;
		return 0;
	}
J
Johann Baudy 已提交
2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
	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;
	}
2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029
	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;
	}
2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041
	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;
	}
2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057
	case PACKET_VNET_HDR:
	{
		int val;

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

		po->has_vnet_hdr = !!val;
		return 0;
	}
2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069
	case PACKET_TIMESTAMP:
	{
		int val;

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

		po->tp_tstamp = val;
		return 0;
	}
L
Linus Torvalds 已提交
2070 2071 2072 2073 2074 2075 2076 2077 2078
	default:
		return -ENOPROTOOPT;
	}
}

static int packet_getsockopt(struct socket *sock, int level, int optname,
			     char __user *optval, int __user *optlen)
{
	int len;
2079
	int val;
L
Linus Torvalds 已提交
2080 2081
	struct sock *sk = sock->sk;
	struct packet_sock *po = pkt_sk(sk);
2082 2083
	void *data;
	struct tpacket_stats st;
L
Linus Torvalds 已提交
2084 2085 2086 2087

	if (level != SOL_PACKET)
		return -ENOPROTOOPT;

2088 2089
	if (get_user(len, optlen))
		return -EFAULT;
L
Linus Torvalds 已提交
2090 2091 2092

	if (len < 0)
		return -EINVAL;
2093

J
Johann Baudy 已提交
2094
	switch (optname) {
L
Linus Torvalds 已提交
2095 2096 2097 2098 2099 2100 2101 2102 2103
	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;

2104 2105 2106 2107 2108 2109 2110
		data = &st;
		break;
	case PACKET_AUXDATA:
		if (len > sizeof(int))
			len = sizeof(int);
		val = po->auxdata;

2111 2112 2113 2114 2115 2116 2117
		data = &val;
		break;
	case PACKET_ORIGDEV:
		if (len > sizeof(int))
			len = sizeof(int);
		val = po->origdev;

2118 2119 2120 2121 2122 2123 2124
		data = &val;
		break;
	case PACKET_VNET_HDR:
		if (len > sizeof(int))
			len = sizeof(int);
		val = po->has_vnet_hdr;

2125
		data = &val;
L
Linus Torvalds 已提交
2126
		break;
2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149
	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;
2150 2151 2152 2153 2154 2155
	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
2156 2157 2158 2159 2160 2161
	case PACKET_LOSS:
		if (len > sizeof(unsigned int))
			len = sizeof(unsigned int);
		val = po->tp_loss;
		data = &val;
		break;
2162 2163 2164 2165 2166 2167
	case PACKET_TIMESTAMP:
		if (len > sizeof(int))
			len = sizeof(int);
		val = po->tp_tstamp;
		data = &val;
		break;
L
Linus Torvalds 已提交
2168 2169 2170 2171
	default:
		return -ENOPROTOOPT;
	}

2172 2173
	if (put_user(len, optlen))
		return -EFAULT;
2174 2175
	if (copy_to_user(optval, data, len))
		return -EFAULT;
2176
	return 0;
L
Linus Torvalds 已提交
2177 2178 2179 2180 2181 2182 2183
}


static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
{
	struct sock *sk;
	struct hlist_node *node;
2184
	struct net_device *dev = data;
2185
	struct net *net = dev_net(dev);
L
Linus Torvalds 已提交
2186

2187 2188
	rcu_read_lock();
	sk_for_each_rcu(sk, node, &net->packet.sklist) {
L
Linus Torvalds 已提交
2189 2190 2191 2192 2193 2194
		struct packet_sock *po = pkt_sk(sk);

		switch (msg) {
		case NETDEV_UNREGISTER:
			if (po->mclist)
				packet_dev_mclist(dev, po->mclist, -1);
2195 2196
			/* fallthrough */

L
Linus Torvalds 已提交
2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215
		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:
2216 2217 2218 2219 2220 2221 2222 2223
			if (dev->ifindex == po->ifindex) {
				spin_lock(&po->bind_lock);
				if (po->num && !po->running) {
					dev_add_pack(&po->prot_hook);
					sock_hold(sk);
					po->running = 1;
				}
				spin_unlock(&po->bind_lock);
L
Linus Torvalds 已提交
2224 2225 2226 2227
			}
			break;
		}
	}
2228
	rcu_read_unlock();
L
Linus Torvalds 已提交
2229 2230 2231 2232 2233 2234 2235 2236 2237
	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
2238
	switch (cmd) {
E
Eric Dumazet 已提交
2239 2240 2241
	case SIOCOUTQ:
	{
		int amount = sk_wmem_alloc_get(sk);
2242

E
Eric Dumazet 已提交
2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260
		return put_user(amount, (int __user *)arg);
	}
	case SIOCINQ:
	{
		struct sk_buff *skb;
		int amount = 0;

		spin_lock_bh(&sk->sk_receive_queue.lock);
		skb = skb_peek(&sk->sk_receive_queue);
		if (skb)
			amount = skb->len;
		spin_unlock_bh(&sk->sk_receive_queue.lock);
		return put_user(amount, (int __user *)arg);
	}
	case SIOCGSTAMP:
		return sock_get_timestamp(sk, (struct timeval __user *)arg);
	case SIOCGSTAMPNS:
		return sock_get_timestampns(sk, (struct timespec __user *)arg);
2261

L
Linus Torvalds 已提交
2262
#ifdef CONFIG_INET
E
Eric Dumazet 已提交
2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277
	case SIOCADDRT:
	case SIOCDELRT:
	case SIOCDARP:
	case SIOCGARP:
	case SIOCSARP:
	case SIOCGIFADDR:
	case SIOCSIFADDR:
	case SIOCGIFBRDADDR:
	case SIOCSIFBRDADDR:
	case SIOCGIFNETMASK:
	case SIOCSIFNETMASK:
	case SIOCGIFDSTADDR:
	case SIOCSIFDSTADDR:
	case SIOCSIFFLAGS:
		return inet_dgram_ops.ioctl(sock, cmd, arg);
L
Linus Torvalds 已提交
2278 2279
#endif

E
Eric Dumazet 已提交
2280 2281
	default:
		return -ENOIOCTLCMD;
L
Linus Torvalds 已提交
2282 2283 2284 2285
	}
	return 0;
}

E
Eric Dumazet 已提交
2286
static unsigned int packet_poll(struct file *file, struct socket *sock,
L
Linus Torvalds 已提交
2287 2288 2289 2290 2291 2292 2293
				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
2294 2295
	if (po->rx_ring.pg_vec) {
		if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL))
L
Linus Torvalds 已提交
2296 2297 2298
			mask |= POLLIN | POLLRDNORM;
	}
	spin_unlock_bh(&sk->sk_receive_queue.lock);
J
Johann Baudy 已提交
2299 2300 2301 2302 2303 2304
	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
2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315
	return mask;
}


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

static void packet_mm_open(struct vm_area_struct *vma)
{
	struct file *file = vma->vm_file;
E
Eric Dumazet 已提交
2316
	struct socket *sock = file->private_data;
L
Linus Torvalds 已提交
2317
	struct sock *sk = sock->sk;
2318

L
Linus Torvalds 已提交
2319 2320 2321 2322 2323 2324 2325
	if (sk)
		atomic_inc(&pkt_sk(sk)->mapped);
}

static void packet_mm_close(struct vm_area_struct *vma)
{
	struct file *file = vma->vm_file;
E
Eric Dumazet 已提交
2326
	struct socket *sock = file->private_data;
L
Linus Torvalds 已提交
2327
	struct sock *sk = sock->sk;
2328

L
Linus Torvalds 已提交
2329 2330 2331 2332
	if (sk)
		atomic_dec(&pkt_sk(sk)->mapped);
}

2333
static const struct vm_operations_struct packet_mmap_ops = {
E
Eric Dumazet 已提交
2334 2335
	.open	=	packet_mm_open,
	.close	=	packet_mm_close,
L
Linus Torvalds 已提交
2336 2337
};

2338 2339
static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
			unsigned int len)
L
Linus Torvalds 已提交
2340 2341 2342
{
	int i;

2343
	for (i = 0; i < len; i++) {
2344
		if (likely(pg_vec[i].buffer)) {
C
Changli Gao 已提交
2345
			if (is_vmalloc_addr(pg_vec[i].buffer))
2346 2347 2348 2349 2350 2351
				vfree(pg_vec[i].buffer);
			else
				free_pages((unsigned long)pg_vec[i].buffer,
					   order);
			pg_vec[i].buffer = NULL;
		}
L
Linus Torvalds 已提交
2352 2353 2354 2355
	}
	kfree(pg_vec);
}

C
Changli Gao 已提交
2356
static inline char *alloc_one_pg_vec_page(unsigned long order)
2357
{
2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369
	char *buffer = NULL;
	gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
			  __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;

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

	if (buffer)
		return buffer;

	/*
	 * __get_free_pages failed, fall back to vmalloc
	 */
E
Eric Dumazet 已提交
2370
	buffer = vzalloc((1 << order) * PAGE_SIZE);
2371

2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386
	if (buffer)
		return buffer;

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

	/*
	 * complete and utter failure
	 */
	return NULL;
2387 2388
}

2389
static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
2390 2391
{
	unsigned int block_nr = req->tp_block_nr;
2392
	struct pgv *pg_vec;
2393 2394
	int i;

2395
	pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL);
2396 2397 2398 2399
	if (unlikely(!pg_vec))
		goto out;

	for (i = 0; i < block_nr; i++) {
C
Changli Gao 已提交
2400
		pg_vec[i].buffer = alloc_one_pg_vec_page(order);
2401
		if (unlikely(!pg_vec[i].buffer))
2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412
			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
2413

J
Johann Baudy 已提交
2414 2415
static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
		int closing, int tx_ring)
L
Linus Torvalds 已提交
2416
{
2417
	struct pgv *pg_vec = NULL;
L
Linus Torvalds 已提交
2418
	struct packet_sock *po = pkt_sk(sk);
A
Al Viro 已提交
2419
	int was_running, order = 0;
J
Johann Baudy 已提交
2420 2421
	struct packet_ring_buffer *rb;
	struct sk_buff_head *rb_queue;
A
Al Viro 已提交
2422
	__be16 num;
J
Johann Baudy 已提交
2423
	int err;
2424

J
Johann Baudy 已提交
2425 2426
	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
2427

J
Johann Baudy 已提交
2428 2429 2430 2431 2432 2433 2434
	err = -EBUSY;
	if (!closing) {
		if (atomic_read(&po->mapped))
			goto out;
		if (atomic_read(&rb->pending))
			goto out;
	}
L
Linus Torvalds 已提交
2435

J
Johann Baudy 已提交
2436 2437 2438 2439 2440
	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
2441

2442 2443 2444 2445 2446 2447 2448 2449 2450
		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
2451
		err = -EINVAL;
2452
		if (unlikely((int)req->tp_block_size <= 0))
J
Johann Baudy 已提交
2453
			goto out;
2454
		if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
J
Johann Baudy 已提交
2455
			goto out;
2456
		if (unlikely(req->tp_frame_size < po->tp_hdrlen +
J
Johann Baudy 已提交
2457 2458
					po->tp_reserve))
			goto out;
2459
		if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
J
Johann Baudy 已提交
2460
			goto out;
L
Linus Torvalds 已提交
2461

J
Johann Baudy 已提交
2462 2463 2464 2465 2466 2467
		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
2468 2469

		err = -ENOMEM;
2470 2471 2472
		order = get_order(req->tp_block_size);
		pg_vec = alloc_pg_vec(req, order);
		if (unlikely(!pg_vec))
L
Linus Torvalds 已提交
2473
			goto out;
J
Johann Baudy 已提交
2474 2475 2476 2477
	}
	/* Done */
	else {
		err = -EINVAL;
2478
		if (unlikely(req->tp_frame_nr))
J
Johann Baudy 已提交
2479
			goto out;
L
Linus Torvalds 已提交
2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494
	}

	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);
2495

L
Linus Torvalds 已提交
2496 2497 2498
	synchronize_net();

	err = -EBUSY;
2499
	mutex_lock(&po->pg_vec_lock);
L
Linus Torvalds 已提交
2500 2501
	if (closing || atomic_read(&po->mapped) == 0) {
		err = 0;
J
Johann Baudy 已提交
2502
		spin_lock_bh(&rb_queue->lock);
2503
		swap(rb->pg_vec, pg_vec);
J
Johann Baudy 已提交
2504 2505 2506 2507 2508
		rb->frame_max = (req->tp_frame_nr - 1);
		rb->head = 0;
		rb->frame_size = req->tp_frame_size;
		spin_unlock_bh(&rb_queue->lock);

2509 2510
		swap(rb->pg_vec_order, order);
		swap(rb->pg_vec_len, req->tp_block_nr);
J
Johann Baudy 已提交
2511 2512 2513 2514 2515

		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
2516
		if (atomic_read(&po->mapped))
E
Eric Dumazet 已提交
2517 2518
			pr_err("packet_mmap: vma is busy: %d\n",
			       atomic_read(&po->mapped));
L
Linus Torvalds 已提交
2519
	}
2520
	mutex_unlock(&po->pg_vec_lock);
L
Linus Torvalds 已提交
2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538

	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
2539 2540
static int packet_mmap(struct file *file, struct socket *sock,
		struct vm_area_struct *vma)
L
Linus Torvalds 已提交
2541 2542 2543
{
	struct sock *sk = sock->sk;
	struct packet_sock *po = pkt_sk(sk);
J
Johann Baudy 已提交
2544 2545
	unsigned long size, expected_size;
	struct packet_ring_buffer *rb;
L
Linus Torvalds 已提交
2546 2547 2548 2549 2550 2551 2552
	unsigned long start;
	int err = -EINVAL;
	int i;

	if (vma->vm_pgoff)
		return -EINVAL;

2553
	mutex_lock(&po->pg_vec_lock);
J
Johann Baudy 已提交
2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564

	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
2565
		goto out;
J
Johann Baudy 已提交
2566 2567 2568

	size = vma->vm_end - vma->vm_start;
	if (size != expected_size)
L
Linus Torvalds 已提交
2569 2570 2571
		goto out;

	start = vma->vm_start;
J
Johann Baudy 已提交
2572 2573 2574 2575 2576
	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++) {
2577 2578
			struct page *page;
			void *kaddr = rb->pg_vec[i].buffer;
J
Johann Baudy 已提交
2579 2580
			int pg_num;

C
Changli Gao 已提交
2581 2582
			for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
				page = pgv_to_page(kaddr);
J
Johann Baudy 已提交
2583 2584 2585 2586
				err = vm_insert_page(vma, start, page);
				if (unlikely(err))
					goto out;
				start += PAGE_SIZE;
2587
				kaddr += PAGE_SIZE;
J
Johann Baudy 已提交
2588
			}
2589
		}
L
Linus Torvalds 已提交
2590
	}
J
Johann Baudy 已提交
2591

2592
	atomic_inc(&po->mapped);
L
Linus Torvalds 已提交
2593 2594 2595 2596
	vma->vm_ops = &packet_mmap_ops;
	err = 0;

out:
2597
	mutex_unlock(&po->pg_vec_lock);
L
Linus Torvalds 已提交
2598 2599 2600
	return err;
}

2601
static const struct proto_ops packet_ops_spkt = {
L
Linus Torvalds 已提交
2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621
	.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,
};

2622
static const struct proto_ops packet_ops = {
L
Linus Torvalds 已提交
2623 2624 2625 2626 2627 2628 2629
	.family =	PF_PACKET,
	.owner =	THIS_MODULE,
	.release =	packet_release,
	.bind =		packet_bind,
	.connect =	sock_no_connect,
	.socketpair =	sock_no_socketpair,
	.accept =	sock_no_accept,
2630
	.getname =	packet_getname,
L
Linus Torvalds 已提交
2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642
	.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,
};

2643
static const struct net_proto_family packet_family_ops = {
L
Linus Torvalds 已提交
2644 2645 2646 2647 2648 2649
	.family =	PF_PACKET,
	.create =	packet_create,
	.owner	=	THIS_MODULE,
};

static struct notifier_block packet_netdev_notifier = {
E
Eric Dumazet 已提交
2650
	.notifier_call =	packet_notifier,
L
Linus Torvalds 已提交
2651 2652 2653 2654 2655
};

#ifdef CONFIG_PROC_FS

static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
2656
	__acquires(RCU)
L
Linus Torvalds 已提交
2657
{
2658
	struct net *net = seq_file_net(seq);
2659 2660 2661

	rcu_read_lock();
	return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
L
Linus Torvalds 已提交
2662 2663 2664 2665
}

static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
2666
	struct net *net = seq_file_net(seq);
2667
	return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
L
Linus Torvalds 已提交
2668 2669 2670
}

static void packet_seq_stop(struct seq_file *seq, void *v)
2671
	__releases(RCU)
L
Linus Torvalds 已提交
2672
{
2673
	rcu_read_unlock();
L
Linus Torvalds 已提交
2674 2675
}

2676
static int packet_seq_show(struct seq_file *seq, void *v)
L
Linus Torvalds 已提交
2677 2678 2679 2680
{
	if (v == SEQ_START_TOKEN)
		seq_puts(seq, "sk       RefCnt Type Proto  Iface R Rmem   User   Inode\n");
	else {
2681
		struct sock *s = sk_entry(v);
L
Linus Torvalds 已提交
2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693
		const struct packet_sock *po = pkt_sk(s);

		seq_printf(seq,
			   "%p %-6d %-4d %04x   %-5d %1d %-6u %-6u %-6lu\n",
			   s,
			   atomic_read(&s->sk_refcnt),
			   s->sk_type,
			   ntohs(po->num),
			   po->ifindex,
			   po->running,
			   atomic_read(&s->sk_rmem_alloc),
			   sock_i_uid(s),
E
Eric Dumazet 已提交
2694
			   sock_i_ino(s));
L
Linus Torvalds 已提交
2695 2696 2697 2698 2699
	}

	return 0;
}

2700
static const struct seq_operations packet_seq_ops = {
L
Linus Torvalds 已提交
2701 2702 2703 2704 2705 2706 2707 2708
	.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)
{
2709 2710
	return seq_open_net(inode, file, &packet_seq_ops,
			    sizeof(struct seq_net_private));
L
Linus Torvalds 已提交
2711 2712
}

2713
static const struct file_operations packet_seq_fops = {
L
Linus Torvalds 已提交
2714 2715 2716 2717
	.owner		= THIS_MODULE,
	.open		= packet_seq_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
2718
	.release	= seq_release_net,
L
Linus Torvalds 已提交
2719 2720 2721 2722
};

#endif

2723
static int __net_init packet_net_init(struct net *net)
2724
{
2725
	spin_lock_init(&net->packet.sklist_lock);
2726
	INIT_HLIST_HEAD(&net->packet.sklist);
2727 2728 2729 2730 2731 2732 2733

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

	return 0;
}

2734
static void __net_exit packet_net_exit(struct net *net)
2735 2736 2737 2738 2739 2740 2741 2742 2743 2744
{
	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
2745 2746 2747
static void __exit packet_exit(void)
{
	unregister_netdevice_notifier(&packet_netdev_notifier);
2748
	unregister_pernet_subsys(&packet_net_ops);
L
Linus Torvalds 已提交
2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760
	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);
2761
	register_pernet_subsys(&packet_net_ops);
L
Linus Torvalds 已提交
2762 2763 2764 2765 2766 2767 2768 2769 2770
	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);