Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * Ethernet-type device handling. | |
7 | * | |
8 | * Version: @(#)eth.c 1.0.7 05/25/93 | |
9 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * Mark Evans, <evansmp@uhura.aston.ac.uk> | |
13 | * Florian La Roche, <rzsfl@rz.uni-sb.de> | |
14 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
03d52d7c | 15 | * |
1da177e4 LT |
16 | * Fixes: |
17 | * Mr Linux : Arp problems | |
18 | * Alan Cox : Generic queue tidyup (very tiny here) | |
19 | * Alan Cox : eth_header ntohs should be htons | |
20 | * Alan Cox : eth_rebuild_header missing an htons and | |
21 | * minor other things. | |
03d52d7c | 22 | * Tegge : Arp bug fixes. |
1da177e4 LT |
23 | * Florian : Removed many unnecessary functions, code cleanup |
24 | * and changes for new arp and skbuff. | |
25 | * Alan Cox : Redid header building to reflect new format. | |
26 | * Alan Cox : ARP only when compiled with CONFIG_INET | |
27 | * Greg Page : 802.2 and SNAP stuff. | |
28 | * Alan Cox : MAC layer pointers/new format. | |
29 | * Paul Gortmaker : eth_copy_and_sum shouldn't csum padding. | |
30 | * Alan Cox : Protect against forwarding explosions with | |
31 | * older network drivers and IFF_ALLMULTI. | |
32 | * Christer Weinigel : Better rebuild header message. | |
33 | * Andrew Morton : 26Feb01: kill ether_setup() - use netdev_boot_setup(). | |
34 | * | |
35 | * This program is free software; you can redistribute it and/or | |
36 | * modify it under the terms of the GNU General Public License | |
37 | * as published by the Free Software Foundation; either version | |
38 | * 2 of the License, or (at your option) any later version. | |
39 | */ | |
40 | #include <linux/module.h> | |
41 | #include <linux/types.h> | |
42 | #include <linux/kernel.h> | |
1da177e4 LT |
43 | #include <linux/string.h> |
44 | #include <linux/mm.h> | |
45 | #include <linux/socket.h> | |
46 | #include <linux/in.h> | |
47 | #include <linux/inet.h> | |
48 | #include <linux/ip.h> | |
49 | #include <linux/netdevice.h> | |
50 | #include <linux/etherdevice.h> | |
51 | #include <linux/skbuff.h> | |
52 | #include <linux/errno.h> | |
1da177e4 | 53 | #include <linux/init.h> |
46f25dff | 54 | #include <linux/if_ether.h> |
c7f5d105 DM |
55 | #include <linux/of_net.h> |
56 | #include <linux/pci.h> | |
1da177e4 LT |
57 | #include <net/dst.h> |
58 | #include <net/arp.h> | |
59 | #include <net/sock.h> | |
60 | #include <net/ipv6.h> | |
61 | #include <net/ip.h> | |
cf85d08f | 62 | #include <net/dsa.h> |
10b89ee4 | 63 | #include <net/flow_dissector.h> |
118a7b0e | 64 | #include <linux/uaccess.h> |
1da177e4 | 65 | |
1da177e4 LT |
66 | __setup("ether=", netdev_boot_setup); |
67 | ||
d3e01f71 SH |
68 | /** |
69 | * eth_header - create the Ethernet header | |
70 | * @skb: buffer to alter | |
71 | * @dev: source device | |
72 | * @type: Ethernet type field | |
73 | * @daddr: destination address (NULL leave destination address) | |
74 | * @saddr: source address (NULL use device source address) | |
75 | * @len: packet length (<= skb->len) | |
1da177e4 | 76 | * |
d3e01f71 | 77 | * |
bf9ae538 OP |
78 | * Set the protocol type. For a packet of type ETH_P_802_3/2 we put the length |
79 | * in here instead. | |
1da177e4 | 80 | */ |
3b04ddde SH |
81 | int eth_header(struct sk_buff *skb, struct net_device *dev, |
82 | unsigned short type, | |
95c96174 | 83 | const void *daddr, const void *saddr, unsigned int len) |
1da177e4 | 84 | { |
2e4ca75b | 85 | struct ethhdr *eth = (struct ethhdr *)skb_push(skb, ETH_HLEN); |
1da177e4 | 86 | |
bf9ae538 | 87 | if (type != ETH_P_802_3 && type != ETH_P_802_2) |
1da177e4 LT |
88 | eth->h_proto = htons(type); |
89 | else | |
90 | eth->h_proto = htons(len); | |
91 | ||
92 | /* | |
2e4ca75b | 93 | * Set the source hardware address. |
1da177e4 | 94 | */ |
2e4ca75b SH |
95 | |
96 | if (!saddr) | |
ff593c59 | 97 | saddr = dev->dev_addr; |
23f1f4ef | 98 | memcpy(eth->h_source, saddr, ETH_ALEN); |
1da177e4 | 99 | |
2e4ca75b | 100 | if (daddr) { |
23f1f4ef | 101 | memcpy(eth->h_dest, daddr, ETH_ALEN); |
f8d0e3f1 JHS |
102 | return ETH_HLEN; |
103 | } | |
2e4ca75b | 104 | |
1da177e4 | 105 | /* |
2e4ca75b | 106 | * Anyway, the loopback-device should never use this function... |
1da177e4 LT |
107 | */ |
108 | ||
2e4ca75b | 109 | if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) { |
afc130dd | 110 | eth_zero_addr(eth->h_dest); |
1da177e4 LT |
111 | return ETH_HLEN; |
112 | } | |
2e4ca75b | 113 | |
1da177e4 LT |
114 | return -ETH_HLEN; |
115 | } | |
3b04ddde | 116 | EXPORT_SYMBOL(eth_header); |
1da177e4 | 117 | |
56193d1b | 118 | /** |
ecea4991 | 119 | * eth_get_headlen - determine the length of header for an ethernet frame |
56193d1b AD |
120 | * @data: pointer to start of frame |
121 | * @len: total length of frame | |
122 | * | |
123 | * Make a best effort attempt to pull the length for all of the headers for | |
124 | * a given frame in a linear buffer. | |
125 | */ | |
126 | u32 eth_get_headlen(void *data, unsigned int len) | |
127 | { | |
d975ddd6 | 128 | const unsigned int flags = FLOW_DISSECTOR_F_PARSE_1ST_FRAG; |
56193d1b AD |
129 | const struct ethhdr *eth = (const struct ethhdr *)data; |
130 | struct flow_keys keys; | |
131 | ||
132 | /* this should never happen, but better safe than sorry */ | |
8a4683a5 | 133 | if (unlikely(len < sizeof(*eth))) |
56193d1b AD |
134 | return len; |
135 | ||
136 | /* parse any remaining L2/L3 headers, check for L4 */ | |
06635a35 | 137 | if (!skb_flow_dissect_flow_keys_buf(&keys, data, eth->h_proto, |
d975ddd6 | 138 | sizeof(*eth), len, flags)) |
c3f83241 | 139 | return max_t(u32, keys.control.thoff, sizeof(*eth)); |
56193d1b AD |
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 | ||
d3e01f71 SH |
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. | |
1da177e4 | 154 | */ |
ab611487 | 155 | __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 156 | { |
0864c158 ED |
157 | unsigned short _service_access_point; |
158 | const unsigned short *sap; | |
159 | const struct ethhdr *eth; | |
2e4ca75b | 160 | |
4c13eb66 | 161 | skb->dev = dev; |
459a98ed | 162 | skb_reset_mac_header(skb); |
610986e7 AD |
163 | |
164 | eth = (struct ethhdr *)skb->data; | |
47d29646 | 165 | skb_pull_inline(skb, ETH_HLEN); |
2e4ca75b | 166 | |
d54385ce | 167 | if (unlikely(is_multicast_ether_addr_64bits(eth->h_dest))) { |
a6700db1 | 168 | if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) |
ba645c16 | 169 | skb->pkt_type = PACKET_BROADCAST; |
1da177e4 | 170 | else |
ba645c16 | 171 | skb->pkt_type = PACKET_MULTICAST; |
1da177e4 | 172 | } |
12861b7b | 173 | else if (unlikely(!ether_addr_equal_64bits(eth->h_dest, |
174 | dev->dev_addr))) | |
175 | skb->pkt_type = PACKET_OTHERHOST; | |
2e4ca75b | 176 | |
cf85d08f LB |
177 | /* |
178 | * Some variants of DSA tagging don't have an ethertype field | |
179 | * at all, so we check here whether one of those tagging | |
180 | * variants has been configured on the receiving interface, | |
181 | * and if so, set skb->protocol without looking at the packet. | |
182 | */ | |
3e8a72d1 FF |
183 | if (unlikely(netdev_uses_dsa(dev))) |
184 | return htons(ETH_P_XDSA); | |
cf85d08f | 185 | |
2c7a88c2 | 186 | if (likely(eth_proto_is_802_3(eth->h_proto))) |
1da177e4 | 187 | return eth->h_proto; |
2e4ca75b | 188 | |
1da177e4 | 189 | /* |
2e4ca75b SH |
190 | * This is a magic hack to spot IPX packets. Older Novell breaks |
191 | * the protocol design and runs IPX over 802.3 without an 802.2 LLC | |
192 | * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This | |
193 | * won't work for fault tolerant netware but does for the rest. | |
1da177e4 | 194 | */ |
0864c158 ED |
195 | sap = skb_header_pointer(skb, 0, sizeof(*sap), &_service_access_point); |
196 | if (sap && *sap == 0xFFFF) | |
1da177e4 | 197 | return htons(ETH_P_802_3); |
2e4ca75b | 198 | |
1da177e4 | 199 | /* |
2e4ca75b | 200 | * Real 802.2 LLC |
1da177e4 LT |
201 | */ |
202 | return htons(ETH_P_802_2); | |
203 | } | |
2e4ca75b | 204 | EXPORT_SYMBOL(eth_type_trans); |
1da177e4 | 205 | |
d3e01f71 SH |
206 | /** |
207 | * eth_header_parse - extract hardware address from packet | |
208 | * @skb: packet to extract header from | |
209 | * @haddr: destination buffer | |
210 | */ | |
3b04ddde | 211 | int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
1da177e4 | 212 | { |
b95cce35 | 213 | const struct ethhdr *eth = eth_hdr(skb); |
1da177e4 LT |
214 | memcpy(haddr, eth->h_source, ETH_ALEN); |
215 | return ETH_ALEN; | |
216 | } | |
3b04ddde | 217 | EXPORT_SYMBOL(eth_header_parse); |
1da177e4 | 218 | |
d3e01f71 SH |
219 | /** |
220 | * eth_header_cache - fill cache entry from neighbour | |
221 | * @neigh: source neighbour | |
222 | * @hh: destination cache entry | |
48daec03 | 223 | * @type: Ethernet type field |
2c53040f | 224 | * |
d3e01f71 SH |
225 | * Create an Ethernet header template from the neighbour. |
226 | */ | |
e69dd336 | 227 | int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh, __be16 type) |
1da177e4 | 228 | { |
1da177e4 | 229 | struct ethhdr *eth; |
3b04ddde | 230 | const struct net_device *dev = neigh->dev; |
1da177e4 | 231 | |
2e4ca75b SH |
232 | eth = (struct ethhdr *) |
233 | (((u8 *) hh->hh_data) + (HH_DATA_OFF(sizeof(*eth)))); | |
1da177e4 | 234 | |
f576e24f | 235 | if (type == htons(ETH_P_802_3)) |
1da177e4 LT |
236 | return -1; |
237 | ||
238 | eth->h_proto = type; | |
23f1f4ef SH |
239 | memcpy(eth->h_source, dev->dev_addr, ETH_ALEN); |
240 | memcpy(eth->h_dest, neigh->ha, ETH_ALEN); | |
1da177e4 LT |
241 | hh->hh_len = ETH_HLEN; |
242 | return 0; | |
243 | } | |
3b04ddde | 244 | EXPORT_SYMBOL(eth_header_cache); |
1da177e4 | 245 | |
d3e01f71 SH |
246 | /** |
247 | * eth_header_cache_update - update cache entry | |
248 | * @hh: destination cache entry | |
249 | * @dev: network device | |
250 | * @haddr: new hardware address | |
251 | * | |
1da177e4 LT |
252 | * Called by Address Resolution module to notify changes in address. |
253 | */ | |
3b04ddde SH |
254 | void eth_header_cache_update(struct hh_cache *hh, |
255 | const struct net_device *dev, | |
256 | const unsigned char *haddr) | |
1da177e4 | 257 | { |
2e4ca75b | 258 | memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)), |
23f1f4ef | 259 | haddr, ETH_ALEN); |
1da177e4 | 260 | } |
3b04ddde | 261 | EXPORT_SYMBOL(eth_header_cache_update); |
1da177e4 | 262 | |
fa0879e3 SH |
263 | /** |
264 | * eth_prepare_mac_addr_change - prepare for mac change | |
265 | * @dev: network device | |
266 | * @p: socket address | |
267 | */ | |
268 | int eth_prepare_mac_addr_change(struct net_device *dev, void *p) | |
269 | { | |
270 | struct sockaddr *addr = p; | |
271 | ||
272 | if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev)) | |
273 | return -EBUSY; | |
274 | if (!is_valid_ether_addr(addr->sa_data)) | |
275 | return -EADDRNOTAVAIL; | |
276 | return 0; | |
277 | } | |
278 | EXPORT_SYMBOL(eth_prepare_mac_addr_change); | |
279 | ||
280 | /** | |
281 | * eth_commit_mac_addr_change - commit mac change | |
282 | * @dev: network device | |
283 | * @p: socket address | |
284 | */ | |
285 | void eth_commit_mac_addr_change(struct net_device *dev, void *p) | |
286 | { | |
287 | struct sockaddr *addr = p; | |
288 | ||
289 | memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); | |
290 | } | |
291 | EXPORT_SYMBOL(eth_commit_mac_addr_change); | |
292 | ||
d3e01f71 SH |
293 | /** |
294 | * eth_mac_addr - set new Ethernet hardware address | |
295 | * @dev: network device | |
296 | * @p: socket address | |
2c53040f | 297 | * |
d3e01f71 SH |
298 | * Change hardware address of device. |
299 | * | |
300 | * This doesn't change hardware matching, so needs to be overridden | |
301 | * for most real devices. | |
302 | */ | |
ccad637b | 303 | int eth_mac_addr(struct net_device *dev, void *p) |
1da177e4 | 304 | { |
fa0879e3 | 305 | int ret; |
71bffe55 | 306 | |
fa0879e3 SH |
307 | ret = eth_prepare_mac_addr_change(dev, p); |
308 | if (ret < 0) | |
309 | return ret; | |
310 | eth_commit_mac_addr_change(dev, p); | |
1da177e4 LT |
311 | return 0; |
312 | } | |
ccad637b | 313 | EXPORT_SYMBOL(eth_mac_addr); |
1da177e4 | 314 | |
d3e01f71 SH |
315 | /** |
316 | * eth_change_mtu - set new MTU size | |
317 | * @dev: network device | |
318 | * @new_mtu: new Maximum Transfer Unit | |
319 | * | |
320 | * Allow changing MTU size. Needs to be overridden for devices | |
321 | * supporting jumbo frames. | |
322 | */ | |
ccad637b | 323 | int eth_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 | 324 | { |
46f25dff | 325 | if (new_mtu < 68 || new_mtu > ETH_DATA_LEN) |
1da177e4 LT |
326 | return -EINVAL; |
327 | dev->mtu = new_mtu; | |
328 | return 0; | |
329 | } | |
ccad637b | 330 | EXPORT_SYMBOL(eth_change_mtu); |
1da177e4 | 331 | |
ccad637b | 332 | int eth_validate_addr(struct net_device *dev) |
bada339b JG |
333 | { |
334 | if (!is_valid_ether_addr(dev->dev_addr)) | |
2ed9926e | 335 | return -EADDRNOTAVAIL; |
bada339b JG |
336 | |
337 | return 0; | |
338 | } | |
ccad637b | 339 | EXPORT_SYMBOL(eth_validate_addr); |
bada339b | 340 | |
3b04ddde SH |
341 | const struct header_ops eth_header_ops ____cacheline_aligned = { |
342 | .create = eth_header, | |
343 | .parse = eth_header_parse, | |
3b04ddde SH |
344 | .cache = eth_header_cache, |
345 | .cache_update = eth_header_cache_update, | |
346 | }; | |
347 | ||
d3e01f71 SH |
348 | /** |
349 | * ether_setup - setup Ethernet network device | |
350 | * @dev: network device | |
2c53040f | 351 | * |
d3e01f71 | 352 | * Fill in the fields of the device structure with Ethernet-generic values. |
1da177e4 LT |
353 | */ |
354 | void ether_setup(struct net_device *dev) | |
355 | { | |
3b04ddde | 356 | dev->header_ops = ð_header_ops; |
1da177e4 LT |
357 | dev->type = ARPHRD_ETHER; |
358 | dev->hard_header_len = ETH_HLEN; | |
46f25dff | 359 | dev->mtu = ETH_DATA_LEN; |
1da177e4 | 360 | dev->addr_len = ETH_ALEN; |
03d52d7c | 361 | dev->tx_queue_len = 1000; /* Ethernet wants good queues */ |
1da177e4 | 362 | dev->flags = IFF_BROADCAST|IFF_MULTICAST; |
31dda0ae | 363 | dev->priv_flags |= IFF_TX_SKB_SHARING; |
03d52d7c | 364 | |
afc130dd | 365 | eth_broadcast_addr(dev->broadcast); |
1da177e4 LT |
366 | |
367 | } | |
368 | EXPORT_SYMBOL(ether_setup); | |
369 | ||
370 | /** | |
36909ea4 | 371 | * alloc_etherdev_mqs - Allocates and sets up an Ethernet device |
1da177e4 | 372 | * @sizeof_priv: Size of additional driver-private structure to be allocated |
d3e01f71 | 373 | * for this Ethernet device |
36909ea4 | 374 | * @txqs: The number of TX queues this device has. |
3806b4f3 | 375 | * @rxqs: The number of RX queues this device has. |
1da177e4 | 376 | * |
d3e01f71 | 377 | * Fill in the fields of the device structure with Ethernet-generic |
1da177e4 LT |
378 | * values. Basically does everything except registering the device. |
379 | * | |
380 | * Constructs a new net device, complete with a private data area of | |
d3e01f71 | 381 | * size (sizeof_priv). A 32-byte (not bit) alignment is enforced for |
1da177e4 LT |
382 | * this private data area. |
383 | */ | |
384 | ||
36909ea4 TH |
385 | struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs, |
386 | unsigned int rxqs) | |
1da177e4 | 387 | { |
c835a677 TG |
388 | return alloc_netdev_mqs(sizeof_priv, "eth%d", NET_NAME_UNKNOWN, |
389 | ether_setup, txqs, rxqs); | |
1da177e4 | 390 | } |
36909ea4 | 391 | EXPORT_SYMBOL(alloc_etherdev_mqs); |
0795af57 | 392 | |
7ffc49a6 MC |
393 | ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len) |
394 | { | |
ae8e9c5a | 395 | return scnprintf(buf, PAGE_SIZE, "%*phC\n", len, addr); |
7ffc49a6 MC |
396 | } |
397 | EXPORT_SYMBOL(sysfs_format_mac); | |
9b174d88 JG |
398 | |
399 | struct sk_buff **eth_gro_receive(struct sk_buff **head, | |
400 | struct sk_buff *skb) | |
401 | { | |
402 | struct sk_buff *p, **pp = NULL; | |
403 | struct ethhdr *eh, *eh2; | |
404 | unsigned int hlen, off_eth; | |
405 | const struct packet_offload *ptype; | |
406 | __be16 type; | |
407 | int flush = 1; | |
408 | ||
409 | off_eth = skb_gro_offset(skb); | |
410 | hlen = off_eth + sizeof(*eh); | |
411 | eh = skb_gro_header_fast(skb, off_eth); | |
412 | if (skb_gro_header_hard(skb, hlen)) { | |
413 | eh = skb_gro_header_slow(skb, hlen, off_eth); | |
414 | if (unlikely(!eh)) | |
415 | goto out; | |
416 | } | |
417 | ||
418 | flush = 0; | |
419 | ||
420 | for (p = *head; p; p = p->next) { | |
421 | if (!NAPI_GRO_CB(p)->same_flow) | |
422 | continue; | |
423 | ||
424 | eh2 = (struct ethhdr *)(p->data + off_eth); | |
425 | if (compare_ether_header(eh, eh2)) { | |
426 | NAPI_GRO_CB(p)->same_flow = 0; | |
427 | continue; | |
428 | } | |
429 | } | |
430 | ||
431 | type = eh->h_proto; | |
432 | ||
433 | rcu_read_lock(); | |
434 | ptype = gro_find_receive_by_type(type); | |
435 | if (ptype == NULL) { | |
436 | flush = 1; | |
437 | goto out_unlock; | |
438 | } | |
439 | ||
440 | skb_gro_pull(skb, sizeof(*eh)); | |
441 | skb_gro_postpull_rcsum(skb, eh, sizeof(*eh)); | |
442 | pp = ptype->callbacks.gro_receive(head, skb); | |
443 | ||
444 | out_unlock: | |
445 | rcu_read_unlock(); | |
446 | out: | |
447 | NAPI_GRO_CB(skb)->flush |= flush; | |
448 | ||
449 | return pp; | |
450 | } | |
451 | EXPORT_SYMBOL(eth_gro_receive); | |
452 | ||
453 | int eth_gro_complete(struct sk_buff *skb, int nhoff) | |
454 | { | |
455 | struct ethhdr *eh = (struct ethhdr *)(skb->data + nhoff); | |
456 | __be16 type = eh->h_proto; | |
457 | struct packet_offload *ptype; | |
458 | int err = -ENOSYS; | |
459 | ||
460 | if (skb->encapsulation) | |
461 | skb_set_inner_mac_header(skb, nhoff); | |
462 | ||
463 | rcu_read_lock(); | |
464 | ptype = gro_find_complete_by_type(type); | |
465 | if (ptype != NULL) | |
466 | err = ptype->callbacks.gro_complete(skb, nhoff + | |
467 | sizeof(struct ethhdr)); | |
468 | ||
469 | rcu_read_unlock(); | |
470 | return err; | |
471 | } | |
472 | EXPORT_SYMBOL(eth_gro_complete); | |
473 | ||
474 | static struct packet_offload eth_packet_offload __read_mostly = { | |
475 | .type = cpu_to_be16(ETH_P_TEB), | |
bdef7de4 | 476 | .priority = 10, |
9b174d88 JG |
477 | .callbacks = { |
478 | .gro_receive = eth_gro_receive, | |
479 | .gro_complete = eth_gro_complete, | |
480 | }, | |
481 | }; | |
482 | ||
483 | static int __init eth_offload_init(void) | |
484 | { | |
485 | dev_add_offload(ð_packet_offload); | |
486 | ||
487 | return 0; | |
488 | } | |
489 | ||
490 | fs_initcall(eth_offload_init); | |
c7f5d105 DM |
491 | |
492 | unsigned char * __weak arch_get_platform_mac_address(void) | |
493 | { | |
494 | return NULL; | |
495 | } | |
496 | ||
497 | int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr) | |
498 | { | |
499 | const unsigned char *addr; | |
500 | struct device_node *dp; | |
501 | ||
502 | if (dev_is_pci(dev)) | |
503 | dp = pci_device_to_OF_node(to_pci_dev(dev)); | |
504 | else | |
505 | dp = dev->of_node; | |
506 | ||
507 | addr = NULL; | |
508 | if (dp) | |
509 | addr = of_get_mac_address(dp); | |
510 | if (!addr) | |
511 | addr = arch_get_platform_mac_address(); | |
512 | ||
513 | if (!addr) | |
514 | return -ENODEV; | |
515 | ||
516 | ether_addr_copy(mac_addr, addr); | |
517 | return 0; | |
518 | } | |
519 | EXPORT_SYMBOL(eth_platform_get_mac_address); |