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> | |
0e839df9 | 50 | #include <linux/nvmem-consumer.h> |
1da177e4 LT |
51 | #include <linux/etherdevice.h> |
52 | #include <linux/skbuff.h> | |
53 | #include <linux/errno.h> | |
1da177e4 | 54 | #include <linux/init.h> |
46f25dff | 55 | #include <linux/if_ether.h> |
c7f5d105 DM |
56 | #include <linux/of_net.h> |
57 | #include <linux/pci.h> | |
1da177e4 LT |
58 | #include <net/dst.h> |
59 | #include <net/arp.h> | |
60 | #include <net/sock.h> | |
61 | #include <net/ipv6.h> | |
62 | #include <net/ip.h> | |
cf85d08f | 63 | #include <net/dsa.h> |
10b89ee4 | 64 | #include <net/flow_dissector.h> |
118a7b0e | 65 | #include <linux/uaccess.h> |
d0a81f67 | 66 | #include <net/pkt_sched.h> |
1da177e4 | 67 | |
1da177e4 LT |
68 | __setup("ether=", netdev_boot_setup); |
69 | ||
d3e01f71 SH |
70 | /** |
71 | * eth_header - create the Ethernet header | |
72 | * @skb: buffer to alter | |
73 | * @dev: source device | |
74 | * @type: Ethernet type field | |
75 | * @daddr: destination address (NULL leave destination address) | |
76 | * @saddr: source address (NULL use device source address) | |
77 | * @len: packet length (<= skb->len) | |
1da177e4 | 78 | * |
d3e01f71 | 79 | * |
bf9ae538 OP |
80 | * Set the protocol type. For a packet of type ETH_P_802_3/2 we put the length |
81 | * in here instead. | |
1da177e4 | 82 | */ |
3b04ddde SH |
83 | int eth_header(struct sk_buff *skb, struct net_device *dev, |
84 | unsigned short type, | |
95c96174 | 85 | const void *daddr, const void *saddr, unsigned int len) |
1da177e4 | 86 | { |
d58ff351 | 87 | struct ethhdr *eth = skb_push(skb, ETH_HLEN); |
1da177e4 | 88 | |
bf9ae538 | 89 | if (type != ETH_P_802_3 && type != ETH_P_802_2) |
1da177e4 LT |
90 | eth->h_proto = htons(type); |
91 | else | |
92 | eth->h_proto = htons(len); | |
93 | ||
94 | /* | |
2e4ca75b | 95 | * Set the source hardware address. |
1da177e4 | 96 | */ |
2e4ca75b SH |
97 | |
98 | if (!saddr) | |
ff593c59 | 99 | saddr = dev->dev_addr; |
23f1f4ef | 100 | memcpy(eth->h_source, saddr, ETH_ALEN); |
1da177e4 | 101 | |
2e4ca75b | 102 | if (daddr) { |
23f1f4ef | 103 | memcpy(eth->h_dest, daddr, ETH_ALEN); |
f8d0e3f1 JHS |
104 | return ETH_HLEN; |
105 | } | |
2e4ca75b | 106 | |
1da177e4 | 107 | /* |
2e4ca75b | 108 | * Anyway, the loopback-device should never use this function... |
1da177e4 LT |
109 | */ |
110 | ||
2e4ca75b | 111 | if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) { |
afc130dd | 112 | eth_zero_addr(eth->h_dest); |
1da177e4 LT |
113 | return ETH_HLEN; |
114 | } | |
2e4ca75b | 115 | |
1da177e4 LT |
116 | return -ETH_HLEN; |
117 | } | |
3b04ddde | 118 | EXPORT_SYMBOL(eth_header); |
1da177e4 | 119 | |
56193d1b | 120 | /** |
ecea4991 | 121 | * eth_get_headlen - determine the length of header for an ethernet frame |
56193d1b AD |
122 | * @data: pointer to start of frame |
123 | * @len: total length of frame | |
124 | * | |
125 | * Make a best effort attempt to pull the length for all of the headers for | |
126 | * a given frame in a linear buffer. | |
127 | */ | |
128 | u32 eth_get_headlen(void *data, unsigned int len) | |
129 | { | |
d975ddd6 | 130 | const unsigned int flags = FLOW_DISSECTOR_F_PARSE_1ST_FRAG; |
56193d1b | 131 | const struct ethhdr *eth = (const struct ethhdr *)data; |
72a338bc | 132 | struct flow_keys_basic keys; |
56193d1b AD |
133 | |
134 | /* this should never happen, but better safe than sorry */ | |
8a4683a5 | 135 | if (unlikely(len < sizeof(*eth))) |
56193d1b AD |
136 | return len; |
137 | ||
138 | /* parse any remaining L2/L3 headers, check for L4 */ | |
72a338bc PA |
139 | if (!skb_flow_dissect_flow_keys_basic(NULL, &keys, data, eth->h_proto, |
140 | sizeof(*eth), len, flags)) | |
c3f83241 | 141 | return max_t(u32, keys.control.thoff, sizeof(*eth)); |
56193d1b AD |
142 | |
143 | /* parse for any L4 headers */ | |
144 | return min_t(u32, __skb_get_poff(NULL, data, &keys, len), len); | |
145 | } | |
146 | EXPORT_SYMBOL(eth_get_headlen); | |
147 | ||
d3e01f71 SH |
148 | /** |
149 | * eth_type_trans - determine the packet's protocol ID. | |
150 | * @skb: received socket data | |
151 | * @dev: receiving network device | |
152 | * | |
153 | * The rule here is that we | |
154 | * assume 802.3 if the type field is short enough to be a length. | |
155 | * This is normal practice and works for any 'now in use' protocol. | |
1da177e4 | 156 | */ |
ab611487 | 157 | __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 158 | { |
0864c158 ED |
159 | unsigned short _service_access_point; |
160 | const unsigned short *sap; | |
161 | const struct ethhdr *eth; | |
2e4ca75b | 162 | |
4c13eb66 | 163 | skb->dev = dev; |
459a98ed | 164 | skb_reset_mac_header(skb); |
610986e7 AD |
165 | |
166 | eth = (struct ethhdr *)skb->data; | |
47d29646 | 167 | skb_pull_inline(skb, ETH_HLEN); |
2e4ca75b | 168 | |
45cf7959 LR |
169 | if (unlikely(!ether_addr_equal_64bits(eth->h_dest, |
170 | dev->dev_addr))) { | |
171 | if (unlikely(is_multicast_ether_addr_64bits(eth->h_dest))) { | |
172 | if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) | |
173 | skb->pkt_type = PACKET_BROADCAST; | |
174 | else | |
175 | skb->pkt_type = PACKET_MULTICAST; | |
176 | } else { | |
177 | skb->pkt_type = PACKET_OTHERHOST; | |
178 | } | |
1da177e4 | 179 | } |
2e4ca75b | 180 | |
cf85d08f LB |
181 | /* |
182 | * Some variants of DSA tagging don't have an ethertype field | |
183 | * at all, so we check here whether one of those tagging | |
184 | * variants has been configured on the receiving interface, | |
185 | * and if so, set skb->protocol without looking at the packet. | |
186 | */ | |
3e8a72d1 FF |
187 | if (unlikely(netdev_uses_dsa(dev))) |
188 | return htons(ETH_P_XDSA); | |
cf85d08f | 189 | |
2c7a88c2 | 190 | if (likely(eth_proto_is_802_3(eth->h_proto))) |
1da177e4 | 191 | return eth->h_proto; |
2e4ca75b | 192 | |
1da177e4 | 193 | /* |
2e4ca75b SH |
194 | * This is a magic hack to spot IPX packets. Older Novell breaks |
195 | * the protocol design and runs IPX over 802.3 without an 802.2 LLC | |
196 | * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This | |
197 | * won't work for fault tolerant netware but does for the rest. | |
1da177e4 | 198 | */ |
0864c158 ED |
199 | sap = skb_header_pointer(skb, 0, sizeof(*sap), &_service_access_point); |
200 | if (sap && *sap == 0xFFFF) | |
1da177e4 | 201 | return htons(ETH_P_802_3); |
2e4ca75b | 202 | |
1da177e4 | 203 | /* |
2e4ca75b | 204 | * Real 802.2 LLC |
1da177e4 LT |
205 | */ |
206 | return htons(ETH_P_802_2); | |
207 | } | |
2e4ca75b | 208 | EXPORT_SYMBOL(eth_type_trans); |
1da177e4 | 209 | |
d3e01f71 SH |
210 | /** |
211 | * eth_header_parse - extract hardware address from packet | |
212 | * @skb: packet to extract header from | |
213 | * @haddr: destination buffer | |
214 | */ | |
3b04ddde | 215 | int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
1da177e4 | 216 | { |
b95cce35 | 217 | const struct ethhdr *eth = eth_hdr(skb); |
1da177e4 LT |
218 | memcpy(haddr, eth->h_source, ETH_ALEN); |
219 | return ETH_ALEN; | |
220 | } | |
3b04ddde | 221 | EXPORT_SYMBOL(eth_header_parse); |
1da177e4 | 222 | |
d3e01f71 SH |
223 | /** |
224 | * eth_header_cache - fill cache entry from neighbour | |
225 | * @neigh: source neighbour | |
226 | * @hh: destination cache entry | |
48daec03 | 227 | * @type: Ethernet type field |
2c53040f | 228 | * |
d3e01f71 SH |
229 | * Create an Ethernet header template from the neighbour. |
230 | */ | |
e69dd336 | 231 | int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh, __be16 type) |
1da177e4 | 232 | { |
1da177e4 | 233 | struct ethhdr *eth; |
3b04ddde | 234 | const struct net_device *dev = neigh->dev; |
1da177e4 | 235 | |
2e4ca75b SH |
236 | eth = (struct ethhdr *) |
237 | (((u8 *) hh->hh_data) + (HH_DATA_OFF(sizeof(*eth)))); | |
1da177e4 | 238 | |
f576e24f | 239 | if (type == htons(ETH_P_802_3)) |
1da177e4 LT |
240 | return -1; |
241 | ||
242 | eth->h_proto = type; | |
23f1f4ef SH |
243 | memcpy(eth->h_source, dev->dev_addr, ETH_ALEN); |
244 | memcpy(eth->h_dest, neigh->ha, ETH_ALEN); | |
1da177e4 LT |
245 | hh->hh_len = ETH_HLEN; |
246 | return 0; | |
247 | } | |
3b04ddde | 248 | EXPORT_SYMBOL(eth_header_cache); |
1da177e4 | 249 | |
d3e01f71 SH |
250 | /** |
251 | * eth_header_cache_update - update cache entry | |
252 | * @hh: destination cache entry | |
253 | * @dev: network device | |
254 | * @haddr: new hardware address | |
255 | * | |
1da177e4 LT |
256 | * Called by Address Resolution module to notify changes in address. |
257 | */ | |
3b04ddde SH |
258 | void eth_header_cache_update(struct hh_cache *hh, |
259 | const struct net_device *dev, | |
260 | const unsigned char *haddr) | |
1da177e4 | 261 | { |
2e4ca75b | 262 | memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)), |
23f1f4ef | 263 | haddr, ETH_ALEN); |
1da177e4 | 264 | } |
3b04ddde | 265 | EXPORT_SYMBOL(eth_header_cache_update); |
1da177e4 | 266 | |
fa0879e3 SH |
267 | /** |
268 | * eth_prepare_mac_addr_change - prepare for mac change | |
269 | * @dev: network device | |
270 | * @p: socket address | |
271 | */ | |
272 | int eth_prepare_mac_addr_change(struct net_device *dev, void *p) | |
273 | { | |
274 | struct sockaddr *addr = p; | |
275 | ||
276 | if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev)) | |
277 | return -EBUSY; | |
278 | if (!is_valid_ether_addr(addr->sa_data)) | |
279 | return -EADDRNOTAVAIL; | |
280 | return 0; | |
281 | } | |
282 | EXPORT_SYMBOL(eth_prepare_mac_addr_change); | |
283 | ||
284 | /** | |
285 | * eth_commit_mac_addr_change - commit mac change | |
286 | * @dev: network device | |
287 | * @p: socket address | |
288 | */ | |
289 | void eth_commit_mac_addr_change(struct net_device *dev, void *p) | |
290 | { | |
291 | struct sockaddr *addr = p; | |
292 | ||
293 | memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); | |
294 | } | |
295 | EXPORT_SYMBOL(eth_commit_mac_addr_change); | |
296 | ||
d3e01f71 SH |
297 | /** |
298 | * eth_mac_addr - set new Ethernet hardware address | |
299 | * @dev: network device | |
300 | * @p: socket address | |
2c53040f | 301 | * |
d3e01f71 SH |
302 | * Change hardware address of device. |
303 | * | |
304 | * This doesn't change hardware matching, so needs to be overridden | |
305 | * for most real devices. | |
306 | */ | |
ccad637b | 307 | int eth_mac_addr(struct net_device *dev, void *p) |
1da177e4 | 308 | { |
fa0879e3 | 309 | int ret; |
71bffe55 | 310 | |
fa0879e3 SH |
311 | ret = eth_prepare_mac_addr_change(dev, p); |
312 | if (ret < 0) | |
313 | return ret; | |
314 | eth_commit_mac_addr_change(dev, p); | |
1da177e4 LT |
315 | return 0; |
316 | } | |
ccad637b | 317 | EXPORT_SYMBOL(eth_mac_addr); |
1da177e4 | 318 | |
d3e01f71 SH |
319 | /** |
320 | * eth_change_mtu - set new MTU size | |
321 | * @dev: network device | |
322 | * @new_mtu: new Maximum Transfer Unit | |
323 | * | |
324 | * Allow changing MTU size. Needs to be overridden for devices | |
325 | * supporting jumbo frames. | |
326 | */ | |
ccad637b | 327 | int eth_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 | 328 | { |
a52ad514 | 329 | netdev_warn(dev, "%s is deprecated\n", __func__); |
1da177e4 LT |
330 | dev->mtu = new_mtu; |
331 | return 0; | |
332 | } | |
ccad637b | 333 | EXPORT_SYMBOL(eth_change_mtu); |
1da177e4 | 334 | |
ccad637b | 335 | int eth_validate_addr(struct net_device *dev) |
bada339b JG |
336 | { |
337 | if (!is_valid_ether_addr(dev->dev_addr)) | |
2ed9926e | 338 | return -EADDRNOTAVAIL; |
bada339b JG |
339 | |
340 | return 0; | |
341 | } | |
ccad637b | 342 | EXPORT_SYMBOL(eth_validate_addr); |
bada339b | 343 | |
3b04ddde SH |
344 | const struct header_ops eth_header_ops ____cacheline_aligned = { |
345 | .create = eth_header, | |
346 | .parse = eth_header_parse, | |
3b04ddde SH |
347 | .cache = eth_header_cache, |
348 | .cache_update = eth_header_cache_update, | |
349 | }; | |
350 | ||
d3e01f71 SH |
351 | /** |
352 | * ether_setup - setup Ethernet network device | |
353 | * @dev: network device | |
2c53040f | 354 | * |
d3e01f71 | 355 | * Fill in the fields of the device structure with Ethernet-generic values. |
1da177e4 LT |
356 | */ |
357 | void ether_setup(struct net_device *dev) | |
358 | { | |
3b04ddde | 359 | dev->header_ops = ð_header_ops; |
1da177e4 LT |
360 | dev->type = ARPHRD_ETHER; |
361 | dev->hard_header_len = ETH_HLEN; | |
217e6fa2 | 362 | dev->min_header_len = ETH_HLEN; |
46f25dff | 363 | dev->mtu = ETH_DATA_LEN; |
a52ad514 JW |
364 | dev->min_mtu = ETH_MIN_MTU; |
365 | dev->max_mtu = ETH_DATA_LEN; | |
1da177e4 | 366 | dev->addr_len = ETH_ALEN; |
d0a81f67 | 367 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; |
1da177e4 | 368 | dev->flags = IFF_BROADCAST|IFF_MULTICAST; |
31dda0ae | 369 | dev->priv_flags |= IFF_TX_SKB_SHARING; |
03d52d7c | 370 | |
afc130dd | 371 | eth_broadcast_addr(dev->broadcast); |
1da177e4 LT |
372 | |
373 | } | |
374 | EXPORT_SYMBOL(ether_setup); | |
375 | ||
376 | /** | |
36909ea4 | 377 | * alloc_etherdev_mqs - Allocates and sets up an Ethernet device |
1da177e4 | 378 | * @sizeof_priv: Size of additional driver-private structure to be allocated |
d3e01f71 | 379 | * for this Ethernet device |
36909ea4 | 380 | * @txqs: The number of TX queues this device has. |
3806b4f3 | 381 | * @rxqs: The number of RX queues this device has. |
1da177e4 | 382 | * |
d3e01f71 | 383 | * Fill in the fields of the device structure with Ethernet-generic |
1da177e4 LT |
384 | * values. Basically does everything except registering the device. |
385 | * | |
386 | * Constructs a new net device, complete with a private data area of | |
d3e01f71 | 387 | * size (sizeof_priv). A 32-byte (not bit) alignment is enforced for |
1da177e4 LT |
388 | * this private data area. |
389 | */ | |
390 | ||
36909ea4 TH |
391 | struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs, |
392 | unsigned int rxqs) | |
1da177e4 | 393 | { |
c835a677 TG |
394 | return alloc_netdev_mqs(sizeof_priv, "eth%d", NET_NAME_UNKNOWN, |
395 | ether_setup, txqs, rxqs); | |
1da177e4 | 396 | } |
36909ea4 | 397 | EXPORT_SYMBOL(alloc_etherdev_mqs); |
0795af57 | 398 | |
40be0dda RM |
399 | static void devm_free_netdev(struct device *dev, void *res) |
400 | { | |
401 | free_netdev(*(struct net_device **)res); | |
402 | } | |
403 | ||
404 | struct net_device *devm_alloc_etherdev_mqs(struct device *dev, int sizeof_priv, | |
405 | unsigned int txqs, unsigned int rxqs) | |
406 | { | |
407 | struct net_device **dr; | |
408 | struct net_device *netdev; | |
409 | ||
410 | dr = devres_alloc(devm_free_netdev, sizeof(*dr), GFP_KERNEL); | |
411 | if (!dr) | |
412 | return NULL; | |
413 | ||
414 | netdev = alloc_etherdev_mqs(sizeof_priv, txqs, rxqs); | |
415 | if (!netdev) { | |
416 | devres_free(dr); | |
417 | return NULL; | |
418 | } | |
419 | ||
420 | *dr = netdev; | |
421 | devres_add(dev, dr); | |
422 | ||
423 | return netdev; | |
424 | } | |
425 | EXPORT_SYMBOL(devm_alloc_etherdev_mqs); | |
426 | ||
7ffc49a6 MC |
427 | ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len) |
428 | { | |
ae8e9c5a | 429 | return scnprintf(buf, PAGE_SIZE, "%*phC\n", len, addr); |
7ffc49a6 MC |
430 | } |
431 | EXPORT_SYMBOL(sysfs_format_mac); | |
9b174d88 | 432 | |
d4546c25 | 433 | struct sk_buff *eth_gro_receive(struct list_head *head, struct sk_buff *skb) |
9b174d88 | 434 | { |
9b174d88 | 435 | const struct packet_offload *ptype; |
d4546c25 DM |
436 | unsigned int hlen, off_eth; |
437 | struct sk_buff *pp = NULL; | |
438 | struct ethhdr *eh, *eh2; | |
439 | struct sk_buff *p; | |
9b174d88 JG |
440 | __be16 type; |
441 | int flush = 1; | |
442 | ||
443 | off_eth = skb_gro_offset(skb); | |
444 | hlen = off_eth + sizeof(*eh); | |
445 | eh = skb_gro_header_fast(skb, off_eth); | |
446 | if (skb_gro_header_hard(skb, hlen)) { | |
447 | eh = skb_gro_header_slow(skb, hlen, off_eth); | |
448 | if (unlikely(!eh)) | |
449 | goto out; | |
450 | } | |
451 | ||
452 | flush = 0; | |
453 | ||
d4546c25 | 454 | list_for_each_entry(p, head, list) { |
9b174d88 JG |
455 | if (!NAPI_GRO_CB(p)->same_flow) |
456 | continue; | |
457 | ||
458 | eh2 = (struct ethhdr *)(p->data + off_eth); | |
459 | if (compare_ether_header(eh, eh2)) { | |
460 | NAPI_GRO_CB(p)->same_flow = 0; | |
461 | continue; | |
462 | } | |
463 | } | |
464 | ||
465 | type = eh->h_proto; | |
466 | ||
467 | rcu_read_lock(); | |
468 | ptype = gro_find_receive_by_type(type); | |
469 | if (ptype == NULL) { | |
470 | flush = 1; | |
471 | goto out_unlock; | |
472 | } | |
473 | ||
474 | skb_gro_pull(skb, sizeof(*eh)); | |
475 | skb_gro_postpull_rcsum(skb, eh, sizeof(*eh)); | |
fcd91dd4 | 476 | pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); |
9b174d88 JG |
477 | |
478 | out_unlock: | |
479 | rcu_read_unlock(); | |
480 | out: | |
5f114163 | 481 | skb_gro_flush_final(skb, pp, flush); |
9b174d88 JG |
482 | |
483 | return pp; | |
484 | } | |
485 | EXPORT_SYMBOL(eth_gro_receive); | |
486 | ||
487 | int eth_gro_complete(struct sk_buff *skb, int nhoff) | |
488 | { | |
489 | struct ethhdr *eh = (struct ethhdr *)(skb->data + nhoff); | |
490 | __be16 type = eh->h_proto; | |
491 | struct packet_offload *ptype; | |
492 | int err = -ENOSYS; | |
493 | ||
494 | if (skb->encapsulation) | |
495 | skb_set_inner_mac_header(skb, nhoff); | |
496 | ||
497 | rcu_read_lock(); | |
498 | ptype = gro_find_complete_by_type(type); | |
499 | if (ptype != NULL) | |
500 | err = ptype->callbacks.gro_complete(skb, nhoff + | |
501 | sizeof(struct ethhdr)); | |
502 | ||
503 | rcu_read_unlock(); | |
504 | return err; | |
505 | } | |
506 | EXPORT_SYMBOL(eth_gro_complete); | |
507 | ||
508 | static struct packet_offload eth_packet_offload __read_mostly = { | |
509 | .type = cpu_to_be16(ETH_P_TEB), | |
bdef7de4 | 510 | .priority = 10, |
9b174d88 JG |
511 | .callbacks = { |
512 | .gro_receive = eth_gro_receive, | |
513 | .gro_complete = eth_gro_complete, | |
514 | }, | |
515 | }; | |
516 | ||
517 | static int __init eth_offload_init(void) | |
518 | { | |
519 | dev_add_offload(ð_packet_offload); | |
520 | ||
521 | return 0; | |
522 | } | |
523 | ||
524 | fs_initcall(eth_offload_init); | |
c7f5d105 DM |
525 | |
526 | unsigned char * __weak arch_get_platform_mac_address(void) | |
527 | { | |
528 | return NULL; | |
529 | } | |
530 | ||
531 | int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr) | |
532 | { | |
533 | const unsigned char *addr; | |
534 | struct device_node *dp; | |
535 | ||
536 | if (dev_is_pci(dev)) | |
537 | dp = pci_device_to_OF_node(to_pci_dev(dev)); | |
538 | else | |
539 | dp = dev->of_node; | |
540 | ||
541 | addr = NULL; | |
542 | if (dp) | |
543 | addr = of_get_mac_address(dp); | |
544 | if (!addr) | |
545 | addr = arch_get_platform_mac_address(); | |
546 | ||
547 | if (!addr) | |
548 | return -ENODEV; | |
549 | ||
550 | ether_addr_copy(mac_addr, addr); | |
551 | return 0; | |
552 | } | |
553 | EXPORT_SYMBOL(eth_platform_get_mac_address); | |
0e839df9 BG |
554 | |
555 | /** | |
556 | * Obtain the MAC address from an nvmem cell named 'mac-address' associated | |
557 | * with given device. | |
558 | * | |
559 | * @dev: Device with which the mac-address cell is associated. | |
560 | * @addrbuf: Buffer to which the MAC address will be copied on success. | |
561 | * | |
562 | * Returns 0 on success or a negative error number on failure. | |
563 | */ | |
564 | int nvmem_get_mac_address(struct device *dev, void *addrbuf) | |
565 | { | |
566 | struct nvmem_cell *cell; | |
567 | const void *mac; | |
568 | size_t len; | |
569 | ||
570 | cell = nvmem_cell_get(dev, "mac-address"); | |
571 | if (IS_ERR(cell)) | |
572 | return PTR_ERR(cell); | |
573 | ||
574 | mac = nvmem_cell_read(cell, &len); | |
575 | nvmem_cell_put(cell); | |
576 | ||
577 | if (IS_ERR(mac)) | |
578 | return PTR_ERR(mac); | |
579 | ||
580 | if (len != ETH_ALEN || !is_valid_ether_addr(mac)) { | |
581 | kfree(mac); | |
582 | return -EINVAL; | |
583 | } | |
584 | ||
585 | ether_addr_copy(addrbuf, mac); | |
586 | kfree(mac); | |
587 | ||
588 | return 0; | |
589 | } | |
590 | EXPORT_SYMBOL(nvmem_get_mac_address); |