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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. NET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Definitions for the Ethernet handlers.
8 *
9 * Version: @(#)eth.h 1.0.4 05/13/93
10 *
11 * Authors: Ross Biro
12 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
13 *
14 * Relocated to include/linux where it belongs by Alan Cox
15 * <gw4pts@gw4pts.ampr.org>
16 */
17#ifndef _LINUX_ETHERDEVICE_H
18#define _LINUX_ETHERDEVICE_H
19
20#include <linux/if_ether.h>
21#include <linux/netdevice.h>
22#include <linux/random.h>
23#include <linux/crc32.h>
24#include <linux/unaligned.h>
25#include <asm/bitsperlong.h>
26
27#ifdef __KERNEL__
28struct device;
29struct fwnode_handle;
30
31int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr);
32int platform_get_ethdev_address(struct device *dev, struct net_device *netdev);
33unsigned char *arch_get_platform_mac_address(void);
34int nvmem_get_mac_address(struct device *dev, void *addrbuf);
35int device_get_mac_address(struct device *dev, char *addr);
36int device_get_ethdev_address(struct device *dev, struct net_device *netdev);
37int fwnode_get_mac_address(struct fwnode_handle *fwnode, char *addr);
38
39u32 eth_get_headlen(const struct net_device *dev, const void *data, u32 len);
40__be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev);
41extern const struct header_ops eth_header_ops;
42
43int eth_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
44 const void *daddr, const void *saddr, unsigned len);
45int eth_header_parse(const struct sk_buff *skb, const struct net_device *dev,
46 unsigned char *haddr);
47int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh,
48 __be16 type);
49void eth_header_cache_update(struct hh_cache *hh, const struct net_device *dev,
50 const unsigned char *haddr);
51__be16 eth_header_parse_protocol(const struct sk_buff *skb);
52int eth_prepare_mac_addr_change(struct net_device *dev, void *p);
53void eth_commit_mac_addr_change(struct net_device *dev, void *p);
54int eth_mac_addr(struct net_device *dev, void *p);
55int eth_validate_addr(struct net_device *dev);
56
57struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs,
58 unsigned int rxqs);
59#define alloc_etherdev(sizeof_priv) alloc_etherdev_mq(sizeof_priv, 1)
60#define alloc_etherdev_mq(sizeof_priv, count) alloc_etherdev_mqs(sizeof_priv, count, count)
61
62struct net_device *devm_alloc_etherdev_mqs(struct device *dev, int sizeof_priv,
63 unsigned int txqs,
64 unsigned int rxqs);
65#define devm_alloc_etherdev(dev, sizeof_priv) devm_alloc_etherdev_mqs(dev, sizeof_priv, 1, 1)
66
67struct sk_buff *eth_gro_receive(struct list_head *head, struct sk_buff *skb);
68int eth_gro_complete(struct sk_buff *skb, int nhoff);
69
70/* Reserved Ethernet Addresses per IEEE 802.1Q */
71static const u8 eth_reserved_addr_base[ETH_ALEN] __aligned(2) =
72{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
73#define eth_stp_addr eth_reserved_addr_base
74
75static const u8 eth_ipv4_mcast_addr_base[ETH_ALEN] __aligned(2) =
76{ 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 };
77
78static const u8 eth_ipv6_mcast_addr_base[ETH_ALEN] __aligned(2) =
79{ 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 };
80
81/**
82 * is_link_local_ether_addr - Determine if given Ethernet address is link-local
83 * @addr: Pointer to a six-byte array containing the Ethernet address
84 *
85 * Return: true if address is link local reserved addr (01:80:c2:00:00:0X) per
86 * IEEE 802.1Q 8.6.3 Frame filtering.
87 *
88 * Please note: addr must be aligned to u16.
89 */
90static inline bool is_link_local_ether_addr(const u8 *addr)
91{
92 __be16 *a = (__be16 *)addr;
93 static const __be16 *b = (const __be16 *)eth_reserved_addr_base;
94 static const __be16 m = cpu_to_be16(0xfff0);
95
96#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
97 return (((*(const u32 *)addr) ^ (*(const u32 *)b)) |
98 (__force int)((a[2] ^ b[2]) & m)) == 0;
99#else
100 return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | ((a[2] ^ b[2]) & m)) == 0;
101#endif
102}
103
104/**
105 * is_zero_ether_addr - Determine if give Ethernet address is all zeros.
106 * @addr: Pointer to a six-byte array containing the Ethernet address
107 *
108 * Return: true if the address is all zeroes.
109 *
110 * Please note: addr must be aligned to u16.
111 */
112static inline bool is_zero_ether_addr(const u8 *addr)
113{
114#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
115 return ((*(const u32 *)addr) | (*(const u16 *)(addr + 4))) == 0;
116#else
117 return (*(const u16 *)(addr + 0) |
118 *(const u16 *)(addr + 2) |
119 *(const u16 *)(addr + 4)) == 0;
120#endif
121}
122
123/**
124 * is_multicast_ether_addr - Determine if the Ethernet address is a multicast.
125 * @addr: Pointer to a six-byte array containing the Ethernet address
126 *
127 * Return: true if the address is a multicast address.
128 * By definition the broadcast address is also a multicast address.
129 */
130static inline bool is_multicast_ether_addr(const u8 *addr)
131{
132#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
133 u32 a = *(const u32 *)addr;
134#else
135 u16 a = *(const u16 *)addr;
136#endif
137#ifdef __BIG_ENDIAN
138 return 0x01 & (a >> ((sizeof(a) * 8) - 8));
139#else
140 return 0x01 & a;
141#endif
142}
143
144static inline bool is_multicast_ether_addr_64bits(const u8 *addr)
145{
146#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
147#ifdef __BIG_ENDIAN
148 return 0x01 & ((*(const u64 *)addr) >> 56);
149#else
150 return 0x01 & (*(const u64 *)addr);
151#endif
152#else
153 return is_multicast_ether_addr(addr);
154#endif
155}
156
157/**
158 * is_local_ether_addr - Determine if the Ethernet address is locally-assigned one (IEEE 802).
159 * @addr: Pointer to a six-byte array containing the Ethernet address
160 *
161 * Return: true if the address is a local address.
162 */
163static inline bool is_local_ether_addr(const u8 *addr)
164{
165 return 0x02 & addr[0];
166}
167
168/**
169 * is_broadcast_ether_addr - Determine if the Ethernet address is broadcast
170 * @addr: Pointer to a six-byte array containing the Ethernet address
171 *
172 * Return: true if the address is the broadcast address.
173 *
174 * Please note: addr must be aligned to u16.
175 */
176static inline bool is_broadcast_ether_addr(const u8 *addr)
177{
178 return (*(const u16 *)(addr + 0) &
179 *(const u16 *)(addr + 2) &
180 *(const u16 *)(addr + 4)) == 0xffff;
181}
182
183/**
184 * is_unicast_ether_addr - Determine if the Ethernet address is unicast
185 * @addr: Pointer to a six-byte array containing the Ethernet address
186 *
187 * Return: true if the address is a unicast address.
188 */
189static inline bool is_unicast_ether_addr(const u8 *addr)
190{
191 return !is_multicast_ether_addr(addr);
192}
193
194/**
195 * is_valid_ether_addr - Determine if the given Ethernet address is valid
196 * @addr: Pointer to a six-byte array containing the Ethernet address
197 *
198 * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
199 * a multicast address, and is not FF:FF:FF:FF:FF:FF.
200 *
201 * Return: true if the address is valid.
202 *
203 * Please note: addr must be aligned to u16.
204 */
205static inline bool is_valid_ether_addr(const u8 *addr)
206{
207 /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to
208 * explicitly check for it here. */
209 return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr);
210}
211
212/**
213 * eth_proto_is_802_3 - Determine if a given Ethertype/length is a protocol
214 * @proto: Ethertype/length value to be tested
215 *
216 * Check that the value from the Ethertype/length field is a valid Ethertype.
217 *
218 * Return: true if the valid is an 802.3 supported Ethertype.
219 */
220static inline bool eth_proto_is_802_3(__be16 proto)
221{
222#ifndef __BIG_ENDIAN
223 /* if CPU is little endian mask off bits representing LSB */
224 proto &= htons(0xFF00);
225#endif
226 /* cast both to u16 and compare since LSB can be ignored */
227 return (__force u16)proto >= (__force u16)htons(ETH_P_802_3_MIN);
228}
229
230/**
231 * eth_random_addr - Generate software assigned random Ethernet address
232 * @addr: Pointer to a six-byte array containing the Ethernet address
233 *
234 * Generate a random Ethernet address (MAC) that is not multicast
235 * and has the local assigned bit set.
236 */
237static inline void eth_random_addr(u8 *addr)
238{
239 get_random_bytes(addr, ETH_ALEN);
240 addr[0] &= 0xfe; /* clear multicast bit */
241 addr[0] |= 0x02; /* set local assignment bit (IEEE802) */
242}
243
244/**
245 * eth_broadcast_addr - Assign broadcast address
246 * @addr: Pointer to a six-byte array containing the Ethernet address
247 *
248 * Assign the broadcast address to the given address array.
249 */
250static inline void eth_broadcast_addr(u8 *addr)
251{
252 memset(addr, 0xff, ETH_ALEN);
253}
254
255/**
256 * eth_zero_addr - Assign zero address
257 * @addr: Pointer to a six-byte array containing the Ethernet address
258 *
259 * Assign the zero address to the given address array.
260 */
261static inline void eth_zero_addr(u8 *addr)
262{
263 memset(addr, 0x00, ETH_ALEN);
264}
265
266/**
267 * eth_hw_addr_random - Generate software assigned random Ethernet and
268 * set device flag
269 * @dev: pointer to net_device structure
270 *
271 * Generate a random Ethernet address (MAC) to be used by a net device
272 * and set addr_assign_type so the state can be read by sysfs and be
273 * used by userspace.
274 */
275static inline void eth_hw_addr_random(struct net_device *dev)
276{
277 u8 addr[ETH_ALEN];
278
279 eth_random_addr(addr);
280 __dev_addr_set(dev, addr, ETH_ALEN);
281 dev->addr_assign_type = NET_ADDR_RANDOM;
282}
283
284/**
285 * eth_hw_addr_crc - Calculate CRC from netdev_hw_addr
286 * @ha: pointer to hardware address
287 *
288 * Calculate CRC from a hardware address as basis for filter hashes.
289 */
290static inline u32 eth_hw_addr_crc(struct netdev_hw_addr *ha)
291{
292 return ether_crc(ETH_ALEN, ha->addr);
293}
294
295/**
296 * ether_addr_copy - Copy an Ethernet address
297 * @dst: Pointer to a six-byte array Ethernet address destination
298 * @src: Pointer to a six-byte array Ethernet address source
299 *
300 * Please note: dst & src must both be aligned to u16.
301 */
302static inline void ether_addr_copy(u8 *dst, const u8 *src)
303{
304#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
305 *(u32 *)dst = *(const u32 *)src;
306 *(u16 *)(dst + 4) = *(const u16 *)(src + 4);
307#else
308 u16 *a = (u16 *)dst;
309 const u16 *b = (const u16 *)src;
310
311 a[0] = b[0];
312 a[1] = b[1];
313 a[2] = b[2];
314#endif
315}
316
317/**
318 * eth_hw_addr_set - Assign Ethernet address to a net_device
319 * @dev: pointer to net_device structure
320 * @addr: address to assign
321 *
322 * Assign given address to the net_device, addr_assign_type is not changed.
323 */
324static inline void eth_hw_addr_set(struct net_device *dev, const u8 *addr)
325{
326 __dev_addr_set(dev, addr, ETH_ALEN);
327}
328
329/**
330 * eth_hw_addr_inherit - Copy dev_addr from another net_device
331 * @dst: pointer to net_device to copy dev_addr to
332 * @src: pointer to net_device to copy dev_addr from
333 *
334 * Copy the Ethernet address from one net_device to another along with
335 * the address attributes (addr_assign_type).
336 */
337static inline void eth_hw_addr_inherit(struct net_device *dst,
338 struct net_device *src)
339{
340 dst->addr_assign_type = src->addr_assign_type;
341 eth_hw_addr_set(dst, src->dev_addr);
342}
343
344/**
345 * ether_addr_equal - Compare two Ethernet addresses
346 * @addr1: Pointer to a six-byte array containing the Ethernet address
347 * @addr2: Pointer other six-byte array containing the Ethernet address
348 *
349 * Compare two Ethernet addresses, returns true if equal
350 *
351 * Please note: addr1 & addr2 must both be aligned to u16.
352 */
353static inline bool ether_addr_equal(const u8 *addr1, const u8 *addr2)
354{
355#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
356 u32 fold = ((*(const u32 *)addr1) ^ (*(const u32 *)addr2)) |
357 ((*(const u16 *)(addr1 + 4)) ^ (*(const u16 *)(addr2 + 4)));
358
359 return fold == 0;
360#else
361 const u16 *a = (const u16 *)addr1;
362 const u16 *b = (const u16 *)addr2;
363
364 return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2])) == 0;
365#endif
366}
367
368/**
369 * ether_addr_equal_64bits - Compare two Ethernet addresses
370 * @addr1: Pointer to an array of 8 bytes
371 * @addr2: Pointer to an other array of 8 bytes
372 *
373 * Compare two Ethernet addresses, returns true if equal, false otherwise.
374 *
375 * The function doesn't need any conditional branches and possibly uses
376 * word memory accesses on CPU allowing cheap unaligned memory reads.
377 * arrays = { byte1, byte2, byte3, byte4, byte5, byte6, pad1, pad2 }
378 *
379 * Please note that alignment of addr1 & addr2 are only guaranteed to be 16 bits.
380 */
381
382static inline bool ether_addr_equal_64bits(const u8 *addr1, const u8 *addr2)
383{
384#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
385 u64 fold = (*(const u64 *)addr1) ^ (*(const u64 *)addr2);
386
387#ifdef __BIG_ENDIAN
388 return (fold >> 16) == 0;
389#else
390 return (fold << 16) == 0;
391#endif
392#else
393 return ether_addr_equal(addr1, addr2);
394#endif
395}
396
397/**
398 * ether_addr_equal_unaligned - Compare two not u16 aligned Ethernet addresses
399 * @addr1: Pointer to a six-byte array containing the Ethernet address
400 * @addr2: Pointer other six-byte array containing the Ethernet address
401 *
402 * Compare two Ethernet addresses, returns true if equal
403 *
404 * Please note: Use only when any Ethernet address may not be u16 aligned.
405 */
406static inline bool ether_addr_equal_unaligned(const u8 *addr1, const u8 *addr2)
407{
408#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
409 return ether_addr_equal(addr1, addr2);
410#else
411 return memcmp(addr1, addr2, ETH_ALEN) == 0;
412#endif
413}
414
415/**
416 * ether_addr_equal_masked - Compare two Ethernet addresses with a mask
417 * @addr1: Pointer to a six-byte array containing the 1st Ethernet address
418 * @addr2: Pointer to a six-byte array containing the 2nd Ethernet address
419 * @mask: Pointer to a six-byte array containing the Ethernet address bitmask
420 *
421 * Compare two Ethernet addresses with a mask, returns true if for every bit
422 * set in the bitmask the equivalent bits in the ethernet addresses are equal.
423 * Using a mask with all bits set is a slower ether_addr_equal.
424 */
425static inline bool ether_addr_equal_masked(const u8 *addr1, const u8 *addr2,
426 const u8 *mask)
427{
428 int i;
429
430 for (i = 0; i < ETH_ALEN; i++) {
431 if ((addr1[i] ^ addr2[i]) & mask[i])
432 return false;
433 }
434
435 return true;
436}
437
438static inline bool ether_addr_is_ipv4_mcast(const u8 *addr)
439{
440 u8 mask[ETH_ALEN] = { 0xff, 0xff, 0xff, 0x80, 0x00, 0x00 };
441
442 return ether_addr_equal_masked(addr, eth_ipv4_mcast_addr_base, mask);
443}
444
445static inline bool ether_addr_is_ipv6_mcast(const u8 *addr)
446{
447 u8 mask[ETH_ALEN] = { 0xff, 0xff, 0x00, 0x00, 0x00, 0x00 };
448
449 return ether_addr_equal_masked(addr, eth_ipv6_mcast_addr_base, mask);
450}
451
452static inline bool ether_addr_is_ip_mcast(const u8 *addr)
453{
454 return ether_addr_is_ipv4_mcast(addr) ||
455 ether_addr_is_ipv6_mcast(addr);
456}
457
458/**
459 * ether_addr_to_u64 - Convert an Ethernet address into a u64 value.
460 * @addr: Pointer to a six-byte array containing the Ethernet address
461 *
462 * Return: a u64 value of the address
463 */
464static inline u64 ether_addr_to_u64(const u8 *addr)
465{
466 u64 u = 0;
467 int i;
468
469 for (i = 0; i < ETH_ALEN; i++)
470 u = u << 8 | addr[i];
471
472 return u;
473}
474
475/**
476 * u64_to_ether_addr - Convert a u64 to an Ethernet address.
477 * @u: u64 to convert to an Ethernet MAC address
478 * @addr: Pointer to a six-byte array to contain the Ethernet address
479 */
480static inline void u64_to_ether_addr(u64 u, u8 *addr)
481{
482 int i;
483
484 for (i = ETH_ALEN - 1; i >= 0; i--) {
485 addr[i] = u & 0xff;
486 u = u >> 8;
487 }
488}
489
490/**
491 * eth_addr_dec - Decrement the given MAC address
492 *
493 * @addr: Pointer to a six-byte array containing Ethernet address to decrement
494 */
495static inline void eth_addr_dec(u8 *addr)
496{
497 u64 u = ether_addr_to_u64(addr);
498
499 u--;
500 u64_to_ether_addr(u, addr);
501}
502
503/**
504 * eth_addr_inc() - Increment the given MAC address.
505 * @addr: Pointer to a six-byte array containing Ethernet address to increment.
506 */
507static inline void eth_addr_inc(u8 *addr)
508{
509 u64 u = ether_addr_to_u64(addr);
510
511 u++;
512 u64_to_ether_addr(u, addr);
513}
514
515/**
516 * eth_addr_add() - Add (or subtract) an offset to/from the given MAC address.
517 *
518 * @offset: Offset to add.
519 * @addr: Pointer to a six-byte array containing Ethernet address to increment.
520 */
521static inline void eth_addr_add(u8 *addr, long offset)
522{
523 u64 u = ether_addr_to_u64(addr);
524
525 u += offset;
526 u64_to_ether_addr(u, addr);
527}
528
529/**
530 * is_etherdev_addr - Tell if given Ethernet address belongs to the device.
531 * @dev: Pointer to a device structure
532 * @addr: Pointer to a six-byte array containing the Ethernet address
533 *
534 * Compare passed address with all addresses of the device. Return true if the
535 * address if one of the device addresses.
536 *
537 * Note that this function calls ether_addr_equal_64bits() so take care of
538 * the right padding.
539 */
540static inline bool is_etherdev_addr(const struct net_device *dev,
541 const u8 addr[6 + 2])
542{
543 struct netdev_hw_addr *ha;
544 bool res = false;
545
546 rcu_read_lock();
547 for_each_dev_addr(dev, ha) {
548 res = ether_addr_equal_64bits(addr, ha->addr);
549 if (res)
550 break;
551 }
552 rcu_read_unlock();
553 return res;
554}
555#endif /* __KERNEL__ */
556
557/**
558 * compare_ether_header - Compare two Ethernet headers
559 * @a: Pointer to Ethernet header
560 * @b: Pointer to Ethernet header
561 *
562 * Compare two Ethernet headers, returns 0 if equal.
563 * This assumes that the network header (i.e., IP header) is 4-byte
564 * aligned OR the platform can handle unaligned access. This is the
565 * case for all packets coming into netif_receive_skb or similar
566 * entry points.
567 */
568
569static inline unsigned long compare_ether_header(const void *a, const void *b)
570{
571#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
572 unsigned long fold;
573
574 /*
575 * We want to compare 14 bytes:
576 * [a0 ... a13] ^ [b0 ... b13]
577 * Use two long XOR, ORed together, with an overlap of two bytes.
578 * [a0 a1 a2 a3 a4 a5 a6 a7 ] ^ [b0 b1 b2 b3 b4 b5 b6 b7 ] |
579 * [a6 a7 a8 a9 a10 a11 a12 a13] ^ [b6 b7 b8 b9 b10 b11 b12 b13]
580 * This means the [a6 a7] ^ [b6 b7] part is done two times.
581 */
582 fold = *(unsigned long *)a ^ *(unsigned long *)b;
583 fold |= *(unsigned long *)(a + 6) ^ *(unsigned long *)(b + 6);
584 return fold;
585#else
586 u32 *a32 = (u32 *)((u8 *)a + 2);
587 u32 *b32 = (u32 *)((u8 *)b + 2);
588
589 return (*(u16 *)a ^ *(u16 *)b) | (a32[0] ^ b32[0]) |
590 (a32[1] ^ b32[1]) | (a32[2] ^ b32[2]);
591#endif
592}
593
594/**
595 * eth_hw_addr_gen - Generate and assign Ethernet address to a port
596 * @dev: pointer to port's net_device structure
597 * @base_addr: base Ethernet address
598 * @id: offset to add to the base address
599 *
600 * Generate a MAC address using a base address and an offset and assign it
601 * to a net_device. Commonly used by switch drivers which need to compute
602 * addresses for all their ports. addr_assign_type is not changed.
603 */
604static inline void eth_hw_addr_gen(struct net_device *dev, const u8 *base_addr,
605 unsigned int id)
606{
607 u64 u = ether_addr_to_u64(base_addr);
608 u8 addr[ETH_ALEN];
609
610 u += id;
611 u64_to_ether_addr(u, addr);
612 eth_hw_addr_set(dev, addr);
613}
614
615/**
616 * eth_skb_pkt_type - Assign packet type if destination address does not match
617 * @skb: Assigned a packet type if address does not match @dev address
618 * @dev: Network device used to compare packet address against
619 *
620 * If the destination MAC address of the packet does not match the network
621 * device address, assign an appropriate packet type.
622 */
623static inline void eth_skb_pkt_type(struct sk_buff *skb,
624 const struct net_device *dev)
625{
626 const struct ethhdr *eth = eth_hdr(skb);
627
628 if (unlikely(!ether_addr_equal_64bits(eth->h_dest, dev->dev_addr))) {
629 if (unlikely(is_multicast_ether_addr_64bits(eth->h_dest))) {
630 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
631 skb->pkt_type = PACKET_BROADCAST;
632 else
633 skb->pkt_type = PACKET_MULTICAST;
634 } else {
635 skb->pkt_type = PACKET_OTHERHOST;
636 }
637 }
638}
639
640static inline struct ethhdr *eth_skb_pull_mac(struct sk_buff *skb)
641{
642 struct ethhdr *eth = (struct ethhdr *)skb->data;
643
644 skb_pull_inline(skb, ETH_HLEN);
645 return eth;
646}
647
648/**
649 * eth_skb_pad - Pad buffer to minimum number of octets for Ethernet frame
650 * @skb: Buffer to pad
651 *
652 * An Ethernet frame should have a minimum size of 60 bytes. This function
653 * takes short frames and pads them with zeros up to the 60 byte limit.
654 */
655static inline int eth_skb_pad(struct sk_buff *skb)
656{
657 return skb_put_padto(skb, ETH_ZLEN);
658}
659
660#endif /* _LINUX_ETHERDEVICE_H */