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. INET is implemented using the BSD Socket |
5 | * interface as the means of communication with the user level. |
6 | * |
7 | * Ethernet-type device handling. |
8 | * |
9 | * Version: @(#)eth.c 1.0.7 05/25/93 |
10 | * |
11 | * Authors: Ross Biro |
12 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
13 | * Mark Evans, <evansmp@uhura.aston.ac.uk> |
14 | * Florian La Roche, <rzsfl@rz.uni-sb.de> |
15 | * Alan Cox, <gw4pts@gw4pts.ampr.org> |
16 | * |
17 | * Fixes: |
18 | * Mr Linux : Arp problems |
19 | * Alan Cox : Generic queue tidyup (very tiny here) |
20 | * Alan Cox : eth_header ntohs should be htons |
21 | * Alan Cox : eth_rebuild_header missing an htons and |
22 | * minor other things. |
23 | * Tegge : Arp bug fixes. |
24 | * Florian : Removed many unnecessary functions, code cleanup |
25 | * and changes for new arp and skbuff. |
26 | * Alan Cox : Redid header building to reflect new format. |
27 | * Alan Cox : ARP only when compiled with CONFIG_INET |
28 | * Greg Page : 802.2 and SNAP stuff. |
29 | * Alan Cox : MAC layer pointers/new format. |
30 | * Paul Gortmaker : eth_copy_and_sum shouldn't csum padding. |
31 | * Alan Cox : Protect against forwarding explosions with |
32 | * older network drivers and IFF_ALLMULTI. |
33 | * Christer Weinigel : Better rebuild header message. |
34 | * Andrew Morton : 26Feb01: kill ether_setup() - use netdev_boot_setup(). |
35 | */ |
36 | #include <linux/module.h> |
37 | #include <linux/types.h> |
38 | #include <linux/kernel.h> |
39 | #include <linux/string.h> |
40 | #include <linux/mm.h> |
41 | #include <linux/socket.h> |
42 | #include <linux/in.h> |
43 | #include <linux/inet.h> |
44 | #include <linux/ip.h> |
45 | #include <linux/netdevice.h> |
46 | #include <linux/nvmem-consumer.h> |
47 | #include <linux/etherdevice.h> |
48 | #include <linux/skbuff.h> |
49 | #include <linux/errno.h> |
50 | #include <linux/init.h> |
51 | #include <linux/if_ether.h> |
52 | #include <linux/of_net.h> |
53 | #include <linux/pci.h> |
54 | #include <linux/property.h> |
55 | #include <net/dst.h> |
56 | #include <net/arp.h> |
57 | #include <net/sock.h> |
58 | #include <net/ipv6.h> |
59 | #include <net/ip.h> |
60 | #include <net/dsa.h> |
61 | #include <net/flow_dissector.h> |
62 | #include <net/gro.h> |
63 | #include <linux/uaccess.h> |
64 | #include <net/pkt_sched.h> |
65 | |
66 | /** |
67 | * eth_header - create the Ethernet header |
68 | * @skb: buffer to alter |
69 | * @dev: source device |
70 | * @type: Ethernet type field |
71 | * @daddr: destination address (NULL leave destination address) |
72 | * @saddr: source address (NULL use device source address) |
73 | * @len: packet length (<= skb->len) |
74 | * |
75 | * |
76 | * Set the protocol type. For a packet of type ETH_P_802_3/2 we put the length |
77 | * in here instead. |
78 | */ |
79 | int (struct sk_buff *skb, struct net_device *dev, |
80 | unsigned short type, |
81 | const void *daddr, const void *saddr, unsigned int len) |
82 | { |
83 | struct ethhdr *eth = skb_push(skb, ETH_HLEN); |
84 | |
85 | if (type != ETH_P_802_3 && type != ETH_P_802_2) |
86 | eth->h_proto = htons(type); |
87 | else |
88 | eth->h_proto = htons(len); |
89 | |
90 | /* |
91 | * Set the source hardware address. |
92 | */ |
93 | |
94 | if (!saddr) |
95 | saddr = dev->dev_addr; |
96 | memcpy(eth->h_source, saddr, ETH_ALEN); |
97 | |
98 | if (daddr) { |
99 | memcpy(eth->h_dest, daddr, ETH_ALEN); |
100 | return ETH_HLEN; |
101 | } |
102 | |
103 | /* |
104 | * Anyway, the loopback-device should never use this function... |
105 | */ |
106 | |
107 | if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) { |
108 | eth_zero_addr(addr: eth->h_dest); |
109 | return ETH_HLEN; |
110 | } |
111 | |
112 | return -ETH_HLEN; |
113 | } |
114 | EXPORT_SYMBOL(eth_header); |
115 | |
116 | /** |
117 | * eth_get_headlen - determine the length of header for an ethernet frame |
118 | * @dev: pointer to network device |
119 | * @data: pointer to start of frame |
120 | * @len: total length of frame |
121 | * |
122 | * Make a best effort attempt to pull the length for all of the headers for |
123 | * a given frame in a linear buffer. |
124 | */ |
125 | u32 eth_get_headlen(const struct net_device *dev, const void *data, u32 len) |
126 | { |
127 | const unsigned int flags = FLOW_DISSECTOR_F_PARSE_1ST_FRAG; |
128 | const struct ethhdr *eth = (const struct ethhdr *)data; |
129 | struct flow_keys_basic keys; |
130 | |
131 | /* this should never happen, but better safe than sorry */ |
132 | if (unlikely(len < sizeof(*eth))) |
133 | return len; |
134 | |
135 | /* parse any remaining L2/L3 headers, check for L4 */ |
136 | if (!skb_flow_dissect_flow_keys_basic(net: dev_net(dev), NULL, flow: &keys, data, |
137 | proto: eth->h_proto, nhoff: sizeof(*eth), |
138 | hlen: len, flags)) |
139 | return max_t(u32, keys.control.thoff, sizeof(*eth)); |
140 | |
141 | /* parse for any L4 headers */ |
142 | return min_t(u32, __skb_get_poff(NULL, data, &keys, len), len); |
143 | } |
144 | EXPORT_SYMBOL(eth_get_headlen); |
145 | |
146 | /** |
147 | * eth_type_trans - determine the packet's protocol ID. |
148 | * @skb: received socket data |
149 | * @dev: receiving network device |
150 | * |
151 | * The rule here is that we |
152 | * assume 802.3 if the type field is short enough to be a length. |
153 | * This is normal practice and works for any 'now in use' protocol. |
154 | */ |
155 | __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev) |
156 | { |
157 | unsigned short _service_access_point; |
158 | const unsigned short *sap; |
159 | const struct ethhdr *eth; |
160 | |
161 | skb->dev = dev; |
162 | skb_reset_mac_header(skb); |
163 | |
164 | eth = (struct ethhdr *)skb->data; |
165 | skb_pull_inline(skb, ETH_HLEN); |
166 | |
167 | if (unlikely(!ether_addr_equal_64bits(eth->h_dest, |
168 | dev->dev_addr))) { |
169 | if (unlikely(is_multicast_ether_addr_64bits(eth->h_dest))) { |
170 | if (ether_addr_equal_64bits(addr1: eth->h_dest, addr2: dev->broadcast)) |
171 | skb->pkt_type = PACKET_BROADCAST; |
172 | else |
173 | skb->pkt_type = PACKET_MULTICAST; |
174 | } else { |
175 | skb->pkt_type = PACKET_OTHERHOST; |
176 | } |
177 | } |
178 | |
179 | /* |
180 | * Some variants of DSA tagging don't have an ethertype field |
181 | * at all, so we check here whether one of those tagging |
182 | * variants has been configured on the receiving interface, |
183 | * and if so, set skb->protocol without looking at the packet. |
184 | */ |
185 | if (unlikely(netdev_uses_dsa(dev))) |
186 | return htons(ETH_P_XDSA); |
187 | |
188 | if (likely(eth_proto_is_802_3(eth->h_proto))) |
189 | return eth->h_proto; |
190 | |
191 | /* |
192 | * This is a magic hack to spot IPX packets. Older Novell breaks |
193 | * the protocol design and runs IPX over 802.3 without an 802.2 LLC |
194 | * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This |
195 | * won't work for fault tolerant netware but does for the rest. |
196 | */ |
197 | sap = skb_header_pointer(skb, offset: 0, len: sizeof(*sap), buffer: &_service_access_point); |
198 | if (sap && *sap == 0xFFFF) |
199 | return htons(ETH_P_802_3); |
200 | |
201 | /* |
202 | * Real 802.2 LLC |
203 | */ |
204 | return htons(ETH_P_802_2); |
205 | } |
206 | EXPORT_SYMBOL(eth_type_trans); |
207 | |
208 | /** |
209 | * eth_header_parse - extract hardware address from packet |
210 | * @skb: packet to extract header from |
211 | * @haddr: destination buffer |
212 | */ |
213 | int (const struct sk_buff *skb, unsigned char *haddr) |
214 | { |
215 | const struct ethhdr *eth = eth_hdr(skb); |
216 | memcpy(haddr, eth->h_source, ETH_ALEN); |
217 | return ETH_ALEN; |
218 | } |
219 | EXPORT_SYMBOL(eth_header_parse); |
220 | |
221 | /** |
222 | * eth_header_cache - fill cache entry from neighbour |
223 | * @neigh: source neighbour |
224 | * @hh: destination cache entry |
225 | * @type: Ethernet type field |
226 | * |
227 | * Create an Ethernet header template from the neighbour. |
228 | */ |
229 | int (const struct neighbour *neigh, struct hh_cache *hh, __be16 type) |
230 | { |
231 | struct ethhdr *eth; |
232 | const struct net_device *dev = neigh->dev; |
233 | |
234 | eth = (struct ethhdr *) |
235 | (((u8 *) hh->hh_data) + (HH_DATA_OFF(sizeof(*eth)))); |
236 | |
237 | if (type == htons(ETH_P_802_3)) |
238 | return -1; |
239 | |
240 | eth->h_proto = type; |
241 | memcpy(eth->h_source, dev->dev_addr, ETH_ALEN); |
242 | memcpy(eth->h_dest, neigh->ha, ETH_ALEN); |
243 | |
244 | /* Pairs with READ_ONCE() in neigh_resolve_output(), |
245 | * neigh_hh_output() and neigh_update_hhs(). |
246 | */ |
247 | smp_store_release(&hh->hh_len, ETH_HLEN); |
248 | |
249 | return 0; |
250 | } |
251 | EXPORT_SYMBOL(eth_header_cache); |
252 | |
253 | /** |
254 | * eth_header_cache_update - update cache entry |
255 | * @hh: destination cache entry |
256 | * @dev: network device |
257 | * @haddr: new hardware address |
258 | * |
259 | * Called by Address Resolution module to notify changes in address. |
260 | */ |
261 | void (struct hh_cache *hh, |
262 | const struct net_device *dev, |
263 | const unsigned char *haddr) |
264 | { |
265 | memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)), |
266 | haddr, ETH_ALEN); |
267 | } |
268 | EXPORT_SYMBOL(eth_header_cache_update); |
269 | |
270 | /** |
271 | * eth_header_parse_protocol - extract protocol from L2 header |
272 | * @skb: packet to extract protocol from |
273 | */ |
274 | __be16 (const struct sk_buff *skb) |
275 | { |
276 | const struct ethhdr *eth = eth_hdr(skb); |
277 | |
278 | return eth->h_proto; |
279 | } |
280 | EXPORT_SYMBOL(eth_header_parse_protocol); |
281 | |
282 | /** |
283 | * eth_prepare_mac_addr_change - prepare for mac change |
284 | * @dev: network device |
285 | * @p: socket address |
286 | */ |
287 | int eth_prepare_mac_addr_change(struct net_device *dev, void *p) |
288 | { |
289 | struct sockaddr *addr = p; |
290 | |
291 | if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev)) |
292 | return -EBUSY; |
293 | if (!is_valid_ether_addr(addr: addr->sa_data)) |
294 | return -EADDRNOTAVAIL; |
295 | return 0; |
296 | } |
297 | EXPORT_SYMBOL(eth_prepare_mac_addr_change); |
298 | |
299 | /** |
300 | * eth_commit_mac_addr_change - commit mac change |
301 | * @dev: network device |
302 | * @p: socket address |
303 | */ |
304 | void eth_commit_mac_addr_change(struct net_device *dev, void *p) |
305 | { |
306 | struct sockaddr *addr = p; |
307 | |
308 | eth_hw_addr_set(dev, addr: addr->sa_data); |
309 | } |
310 | EXPORT_SYMBOL(eth_commit_mac_addr_change); |
311 | |
312 | /** |
313 | * eth_mac_addr - set new Ethernet hardware address |
314 | * @dev: network device |
315 | * @p: socket address |
316 | * |
317 | * Change hardware address of device. |
318 | * |
319 | * This doesn't change hardware matching, so needs to be overridden |
320 | * for most real devices. |
321 | */ |
322 | int eth_mac_addr(struct net_device *dev, void *p) |
323 | { |
324 | int ret; |
325 | |
326 | ret = eth_prepare_mac_addr_change(dev, p); |
327 | if (ret < 0) |
328 | return ret; |
329 | eth_commit_mac_addr_change(dev, p); |
330 | return 0; |
331 | } |
332 | EXPORT_SYMBOL(eth_mac_addr); |
333 | |
334 | int eth_validate_addr(struct net_device *dev) |
335 | { |
336 | if (!is_valid_ether_addr(addr: dev->dev_addr)) |
337 | return -EADDRNOTAVAIL; |
338 | |
339 | return 0; |
340 | } |
341 | EXPORT_SYMBOL(eth_validate_addr); |
342 | |
343 | const struct header_ops ____cacheline_aligned = { |
344 | .create = eth_header, |
345 | .parse = eth_header_parse, |
346 | .cache = eth_header_cache, |
347 | .cache_update = eth_header_cache_update, |
348 | .parse_protocol = eth_header_parse_protocol, |
349 | }; |
350 | |
351 | /** |
352 | * ether_setup - setup Ethernet network device |
353 | * @dev: network device |
354 | * |
355 | * Fill in the fields of the device structure with Ethernet-generic values. |
356 | */ |
357 | void ether_setup(struct net_device *dev) |
358 | { |
359 | dev->header_ops = ð_header_ops; |
360 | dev->type = ARPHRD_ETHER; |
361 | dev->hard_header_len = ETH_HLEN; |
362 | dev->min_header_len = ETH_HLEN; |
363 | dev->mtu = ETH_DATA_LEN; |
364 | dev->min_mtu = ETH_MIN_MTU; |
365 | dev->max_mtu = ETH_DATA_LEN; |
366 | dev->addr_len = ETH_ALEN; |
367 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; |
368 | dev->flags = IFF_BROADCAST|IFF_MULTICAST; |
369 | dev->priv_flags |= IFF_TX_SKB_SHARING; |
370 | |
371 | eth_broadcast_addr(addr: dev->broadcast); |
372 | |
373 | } |
374 | EXPORT_SYMBOL(ether_setup); |
375 | |
376 | /** |
377 | * alloc_etherdev_mqs - Allocates and sets up an Ethernet device |
378 | * @sizeof_priv: Size of additional driver-private structure to be allocated |
379 | * for this Ethernet device |
380 | * @txqs: The number of TX queues this device has. |
381 | * @rxqs: The number of RX queues this device has. |
382 | * |
383 | * Fill in the fields of the device structure with Ethernet-generic |
384 | * values. Basically does everything except registering the device. |
385 | * |
386 | * Constructs a new net device, complete with a private data area of |
387 | * size (sizeof_priv). A 32-byte (not bit) alignment is enforced for |
388 | * this private data area. |
389 | */ |
390 | |
391 | struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs, |
392 | unsigned int rxqs) |
393 | { |
394 | return alloc_netdev_mqs(sizeof_priv, name: "eth%d" , NET_NAME_ENUM, |
395 | setup: ether_setup, txqs, rxqs); |
396 | } |
397 | EXPORT_SYMBOL(alloc_etherdev_mqs); |
398 | |
399 | ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len) |
400 | { |
401 | return sysfs_emit(buf, fmt: "%*phC\n" , len, addr); |
402 | } |
403 | EXPORT_SYMBOL(sysfs_format_mac); |
404 | |
405 | struct sk_buff *eth_gro_receive(struct list_head *head, struct sk_buff *skb) |
406 | { |
407 | const struct packet_offload *ptype; |
408 | unsigned int hlen, off_eth; |
409 | struct sk_buff *pp = NULL; |
410 | struct ethhdr *eh, *eh2; |
411 | struct sk_buff *p; |
412 | __be16 type; |
413 | int flush = 1; |
414 | |
415 | off_eth = skb_gro_offset(skb); |
416 | hlen = off_eth + sizeof(*eh); |
417 | eh = skb_gro_header(skb, hlen, offset: off_eth); |
418 | if (unlikely(!eh)) |
419 | goto out; |
420 | |
421 | flush = 0; |
422 | |
423 | list_for_each_entry(p, head, list) { |
424 | if (!NAPI_GRO_CB(p)->same_flow) |
425 | continue; |
426 | |
427 | eh2 = (struct ethhdr *)(p->data + off_eth); |
428 | if (compare_ether_header(a: eh, b: eh2)) { |
429 | NAPI_GRO_CB(p)->same_flow = 0; |
430 | continue; |
431 | } |
432 | } |
433 | |
434 | type = eh->h_proto; |
435 | |
436 | ptype = gro_find_receive_by_type(type); |
437 | if (ptype == NULL) { |
438 | flush = 1; |
439 | goto out; |
440 | } |
441 | |
442 | skb_gro_pull(skb, len: sizeof(*eh)); |
443 | skb_gro_postpull_rcsum(skb, start: eh, len: sizeof(*eh)); |
444 | |
445 | pp = indirect_call_gro_receive_inet(ptype->callbacks.gro_receive, |
446 | ipv6_gro_receive, inet_gro_receive, |
447 | head, skb); |
448 | |
449 | out: |
450 | skb_gro_flush_final(skb, pp, flush); |
451 | |
452 | return pp; |
453 | } |
454 | EXPORT_SYMBOL(eth_gro_receive); |
455 | |
456 | int eth_gro_complete(struct sk_buff *skb, int nhoff) |
457 | { |
458 | struct ethhdr *eh = (struct ethhdr *)(skb->data + nhoff); |
459 | __be16 type = eh->h_proto; |
460 | struct packet_offload *ptype; |
461 | int err = -ENOSYS; |
462 | |
463 | if (skb->encapsulation) |
464 | skb_set_inner_mac_header(skb, offset: nhoff); |
465 | |
466 | ptype = gro_find_complete_by_type(type); |
467 | if (ptype != NULL) |
468 | err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete, |
469 | ipv6_gro_complete, inet_gro_complete, |
470 | skb, nhoff + sizeof(*eh)); |
471 | |
472 | return err; |
473 | } |
474 | EXPORT_SYMBOL(eth_gro_complete); |
475 | |
476 | static struct packet_offload eth_packet_offload __read_mostly = { |
477 | .type = cpu_to_be16(ETH_P_TEB), |
478 | .priority = 10, |
479 | .callbacks = { |
480 | .gro_receive = eth_gro_receive, |
481 | .gro_complete = eth_gro_complete, |
482 | }, |
483 | }; |
484 | |
485 | static int __init eth_offload_init(void) |
486 | { |
487 | dev_add_offload(po: ð_packet_offload); |
488 | |
489 | return 0; |
490 | } |
491 | |
492 | fs_initcall(eth_offload_init); |
493 | |
494 | unsigned char * __weak arch_get_platform_mac_address(void) |
495 | { |
496 | return NULL; |
497 | } |
498 | |
499 | int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr) |
500 | { |
501 | unsigned char *addr; |
502 | int ret; |
503 | |
504 | ret = of_get_mac_address(np: dev->of_node, mac: mac_addr); |
505 | if (!ret) |
506 | return 0; |
507 | |
508 | addr = arch_get_platform_mac_address(); |
509 | if (!addr) |
510 | return -ENODEV; |
511 | |
512 | ether_addr_copy(dst: mac_addr, src: addr); |
513 | |
514 | return 0; |
515 | } |
516 | EXPORT_SYMBOL(eth_platform_get_mac_address); |
517 | |
518 | /** |
519 | * platform_get_ethdev_address - Set netdev's MAC address from a given device |
520 | * @dev: Pointer to the device |
521 | * @netdev: Pointer to netdev to write the address to |
522 | * |
523 | * Wrapper around eth_platform_get_mac_address() which writes the address |
524 | * directly to netdev->dev_addr. |
525 | */ |
526 | int platform_get_ethdev_address(struct device *dev, struct net_device *netdev) |
527 | { |
528 | u8 addr[ETH_ALEN] __aligned(2); |
529 | int ret; |
530 | |
531 | ret = eth_platform_get_mac_address(dev, addr); |
532 | if (!ret) |
533 | eth_hw_addr_set(dev: netdev, addr); |
534 | return ret; |
535 | } |
536 | EXPORT_SYMBOL(platform_get_ethdev_address); |
537 | |
538 | /** |
539 | * nvmem_get_mac_address - Obtain the MAC address from an nvmem cell named |
540 | * 'mac-address' associated with given device. |
541 | * |
542 | * @dev: Device with which the mac-address cell is associated. |
543 | * @addrbuf: Buffer to which the MAC address will be copied on success. |
544 | * |
545 | * Returns 0 on success or a negative error number on failure. |
546 | */ |
547 | int nvmem_get_mac_address(struct device *dev, void *addrbuf) |
548 | { |
549 | struct nvmem_cell *cell; |
550 | const void *mac; |
551 | size_t len; |
552 | |
553 | cell = nvmem_cell_get(dev, id: "mac-address" ); |
554 | if (IS_ERR(ptr: cell)) |
555 | return PTR_ERR(ptr: cell); |
556 | |
557 | mac = nvmem_cell_read(cell, len: &len); |
558 | nvmem_cell_put(cell); |
559 | |
560 | if (IS_ERR(ptr: mac)) |
561 | return PTR_ERR(ptr: mac); |
562 | |
563 | if (len != ETH_ALEN || !is_valid_ether_addr(addr: mac)) { |
564 | kfree(objp: mac); |
565 | return -EINVAL; |
566 | } |
567 | |
568 | ether_addr_copy(dst: addrbuf, src: mac); |
569 | kfree(objp: mac); |
570 | |
571 | return 0; |
572 | } |
573 | |
574 | static int fwnode_get_mac_addr(struct fwnode_handle *fwnode, |
575 | const char *name, char *addr) |
576 | { |
577 | int ret; |
578 | |
579 | ret = fwnode_property_read_u8_array(fwnode, propname: name, val: addr, ETH_ALEN); |
580 | if (ret) |
581 | return ret; |
582 | |
583 | if (!is_valid_ether_addr(addr)) |
584 | return -EINVAL; |
585 | return 0; |
586 | } |
587 | |
588 | /** |
589 | * fwnode_get_mac_address - Get the MAC from the firmware node |
590 | * @fwnode: Pointer to the firmware node |
591 | * @addr: Address of buffer to store the MAC in |
592 | * |
593 | * Search the firmware node for the best MAC address to use. 'mac-address' is |
594 | * checked first, because that is supposed to contain to "most recent" MAC |
595 | * address. If that isn't set, then 'local-mac-address' is checked next, |
596 | * because that is the default address. If that isn't set, then the obsolete |
597 | * 'address' is checked, just in case we're using an old device tree. |
598 | * |
599 | * Note that the 'address' property is supposed to contain a virtual address of |
600 | * the register set, but some DTS files have redefined that property to be the |
601 | * MAC address. |
602 | * |
603 | * All-zero MAC addresses are rejected, because those could be properties that |
604 | * exist in the firmware tables, but were not updated by the firmware. For |
605 | * example, the DTS could define 'mac-address' and 'local-mac-address', with |
606 | * zero MAC addresses. Some older U-Boots only initialized 'local-mac-address'. |
607 | * In this case, the real MAC is in 'local-mac-address', and 'mac-address' |
608 | * exists but is all zeros. |
609 | */ |
610 | int fwnode_get_mac_address(struct fwnode_handle *fwnode, char *addr) |
611 | { |
612 | if (!fwnode_get_mac_addr(fwnode, name: "mac-address" , addr) || |
613 | !fwnode_get_mac_addr(fwnode, name: "local-mac-address" , addr) || |
614 | !fwnode_get_mac_addr(fwnode, name: "address" , addr)) |
615 | return 0; |
616 | |
617 | return -ENOENT; |
618 | } |
619 | EXPORT_SYMBOL(fwnode_get_mac_address); |
620 | |
621 | /** |
622 | * device_get_mac_address - Get the MAC for a given device |
623 | * @dev: Pointer to the device |
624 | * @addr: Address of buffer to store the MAC in |
625 | */ |
626 | int device_get_mac_address(struct device *dev, char *addr) |
627 | { |
628 | return fwnode_get_mac_address(dev_fwnode(dev), addr); |
629 | } |
630 | EXPORT_SYMBOL(device_get_mac_address); |
631 | |
632 | /** |
633 | * device_get_ethdev_address - Set netdev's MAC address from a given device |
634 | * @dev: Pointer to the device |
635 | * @netdev: Pointer to netdev to write the address to |
636 | * |
637 | * Wrapper around device_get_mac_address() which writes the address |
638 | * directly to netdev->dev_addr. |
639 | */ |
640 | int device_get_ethdev_address(struct device *dev, struct net_device *netdev) |
641 | { |
642 | u8 addr[ETH_ALEN]; |
643 | int ret; |
644 | |
645 | ret = device_get_mac_address(dev, addr); |
646 | if (!ret) |
647 | eth_hw_addr_set(dev: netdev, addr); |
648 | return ret; |
649 | } |
650 | EXPORT_SYMBOL(device_get_ethdev_address); |
651 | |