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 |
c43f1255 | 122 | * @dev: pointer to network device |
56193d1b AD |
123 | * @data: pointer to start of frame |
124 | * @len: total length of frame | |
125 | * | |
126 | * Make a best effort attempt to pull the length for all of the headers for | |
127 | * a given frame in a linear buffer. | |
128 | */ | |
c43f1255 | 129 | u32 eth_get_headlen(const struct net_device *dev, void *data, unsigned int len) |
56193d1b | 130 | { |
d975ddd6 | 131 | const unsigned int flags = FLOW_DISSECTOR_F_PARSE_1ST_FRAG; |
56193d1b | 132 | const struct ethhdr *eth = (const struct ethhdr *)data; |
72a338bc | 133 | struct flow_keys_basic keys; |
56193d1b AD |
134 | |
135 | /* this should never happen, but better safe than sorry */ | |
8a4683a5 | 136 | if (unlikely(len < sizeof(*eth))) |
56193d1b AD |
137 | return len; |
138 | ||
139 | /* parse any remaining L2/L3 headers, check for L4 */ | |
c43f1255 | 140 | if (!skb_flow_dissect_flow_keys_basic(dev_net(dev), NULL, &keys, data, |
3cbf4ffb SF |
141 | eth->h_proto, sizeof(*eth), |
142 | len, flags)) | |
c3f83241 | 143 | return max_t(u32, keys.control.thoff, sizeof(*eth)); |
56193d1b AD |
144 | |
145 | /* parse for any L4 headers */ | |
146 | return min_t(u32, __skb_get_poff(NULL, data, &keys, len), len); | |
147 | } | |
148 | EXPORT_SYMBOL(eth_get_headlen); | |
149 | ||
d3e01f71 SH |
150 | /** |
151 | * eth_type_trans - determine the packet's protocol ID. | |
152 | * @skb: received socket data | |
153 | * @dev: receiving network device | |
154 | * | |
155 | * The rule here is that we | |
156 | * assume 802.3 if the type field is short enough to be a length. | |
157 | * This is normal practice and works for any 'now in use' protocol. | |
1da177e4 | 158 | */ |
ab611487 | 159 | __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 160 | { |
0864c158 ED |
161 | unsigned short _service_access_point; |
162 | const unsigned short *sap; | |
163 | const struct ethhdr *eth; | |
2e4ca75b | 164 | |
4c13eb66 | 165 | skb->dev = dev; |
459a98ed | 166 | skb_reset_mac_header(skb); |
610986e7 AD |
167 | |
168 | eth = (struct ethhdr *)skb->data; | |
47d29646 | 169 | skb_pull_inline(skb, ETH_HLEN); |
2e4ca75b | 170 | |
45cf7959 LR |
171 | if (unlikely(!ether_addr_equal_64bits(eth->h_dest, |
172 | dev->dev_addr))) { | |
173 | if (unlikely(is_multicast_ether_addr_64bits(eth->h_dest))) { | |
174 | if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) | |
175 | skb->pkt_type = PACKET_BROADCAST; | |
176 | else | |
177 | skb->pkt_type = PACKET_MULTICAST; | |
178 | } else { | |
179 | skb->pkt_type = PACKET_OTHERHOST; | |
180 | } | |
1da177e4 | 181 | } |
2e4ca75b | 182 | |
cf85d08f LB |
183 | /* |
184 | * Some variants of DSA tagging don't have an ethertype field | |
185 | * at all, so we check here whether one of those tagging | |
186 | * variants has been configured on the receiving interface, | |
187 | * and if so, set skb->protocol without looking at the packet. | |
cc1939e4 VO |
188 | * The DSA tagging protocol may be able to decode some but not all |
189 | * traffic (for example only for management). In that case give it the | |
190 | * option to filter the packets from which it can decode source port | |
191 | * information. | |
cf85d08f | 192 | */ |
cc1939e4 | 193 | if (unlikely(netdev_uses_dsa(dev)) && dsa_can_decode(skb, dev)) |
3e8a72d1 | 194 | return htons(ETH_P_XDSA); |
cf85d08f | 195 | |
2c7a88c2 | 196 | if (likely(eth_proto_is_802_3(eth->h_proto))) |
1da177e4 | 197 | return eth->h_proto; |
2e4ca75b | 198 | |
1da177e4 | 199 | /* |
2e4ca75b SH |
200 | * This is a magic hack to spot IPX packets. Older Novell breaks |
201 | * the protocol design and runs IPX over 802.3 without an 802.2 LLC | |
202 | * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This | |
203 | * won't work for fault tolerant netware but does for the rest. | |
1da177e4 | 204 | */ |
0864c158 ED |
205 | sap = skb_header_pointer(skb, 0, sizeof(*sap), &_service_access_point); |
206 | if (sap && *sap == 0xFFFF) | |
1da177e4 | 207 | return htons(ETH_P_802_3); |
2e4ca75b | 208 | |
1da177e4 | 209 | /* |
2e4ca75b | 210 | * Real 802.2 LLC |
1da177e4 LT |
211 | */ |
212 | return htons(ETH_P_802_2); | |
213 | } | |
2e4ca75b | 214 | EXPORT_SYMBOL(eth_type_trans); |
1da177e4 | 215 | |
d3e01f71 SH |
216 | /** |
217 | * eth_header_parse - extract hardware address from packet | |
218 | * @skb: packet to extract header from | |
219 | * @haddr: destination buffer | |
220 | */ | |
3b04ddde | 221 | int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
1da177e4 | 222 | { |
b95cce35 | 223 | const struct ethhdr *eth = eth_hdr(skb); |
1da177e4 LT |
224 | memcpy(haddr, eth->h_source, ETH_ALEN); |
225 | return ETH_ALEN; | |
226 | } | |
3b04ddde | 227 | EXPORT_SYMBOL(eth_header_parse); |
1da177e4 | 228 | |
d3e01f71 SH |
229 | /** |
230 | * eth_header_cache - fill cache entry from neighbour | |
231 | * @neigh: source neighbour | |
232 | * @hh: destination cache entry | |
48daec03 | 233 | * @type: Ethernet type field |
2c53040f | 234 | * |
d3e01f71 SH |
235 | * Create an Ethernet header template from the neighbour. |
236 | */ | |
e69dd336 | 237 | int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh, __be16 type) |
1da177e4 | 238 | { |
1da177e4 | 239 | struct ethhdr *eth; |
3b04ddde | 240 | const struct net_device *dev = neigh->dev; |
1da177e4 | 241 | |
2e4ca75b SH |
242 | eth = (struct ethhdr *) |
243 | (((u8 *) hh->hh_data) + (HH_DATA_OFF(sizeof(*eth)))); | |
1da177e4 | 244 | |
f576e24f | 245 | if (type == htons(ETH_P_802_3)) |
1da177e4 LT |
246 | return -1; |
247 | ||
248 | eth->h_proto = type; | |
23f1f4ef SH |
249 | memcpy(eth->h_source, dev->dev_addr, ETH_ALEN); |
250 | memcpy(eth->h_dest, neigh->ha, ETH_ALEN); | |
1da177e4 LT |
251 | hh->hh_len = ETH_HLEN; |
252 | return 0; | |
253 | } | |
3b04ddde | 254 | EXPORT_SYMBOL(eth_header_cache); |
1da177e4 | 255 | |
d3e01f71 SH |
256 | /** |
257 | * eth_header_cache_update - update cache entry | |
258 | * @hh: destination cache entry | |
259 | * @dev: network device | |
260 | * @haddr: new hardware address | |
261 | * | |
1da177e4 LT |
262 | * Called by Address Resolution module to notify changes in address. |
263 | */ | |
3b04ddde SH |
264 | void eth_header_cache_update(struct hh_cache *hh, |
265 | const struct net_device *dev, | |
266 | const unsigned char *haddr) | |
1da177e4 | 267 | { |
2e4ca75b | 268 | memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)), |
23f1f4ef | 269 | haddr, ETH_ALEN); |
1da177e4 | 270 | } |
3b04ddde | 271 | EXPORT_SYMBOL(eth_header_cache_update); |
1da177e4 | 272 | |
ace53b2e MM |
273 | /** |
274 | * eth_header_parser_protocol - extract protocol from L2 header | |
275 | * @skb: packet to extract protocol from | |
276 | */ | |
277 | __be16 eth_header_parse_protocol(const struct sk_buff *skb) | |
278 | { | |
279 | const struct ethhdr *eth = eth_hdr(skb); | |
280 | ||
281 | return eth->h_proto; | |
282 | } | |
283 | EXPORT_SYMBOL(eth_header_parse_protocol); | |
284 | ||
fa0879e3 SH |
285 | /** |
286 | * eth_prepare_mac_addr_change - prepare for mac change | |
287 | * @dev: network device | |
288 | * @p: socket address | |
289 | */ | |
290 | int eth_prepare_mac_addr_change(struct net_device *dev, void *p) | |
291 | { | |
292 | struct sockaddr *addr = p; | |
293 | ||
294 | if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev)) | |
295 | return -EBUSY; | |
296 | if (!is_valid_ether_addr(addr->sa_data)) | |
297 | return -EADDRNOTAVAIL; | |
298 | return 0; | |
299 | } | |
300 | EXPORT_SYMBOL(eth_prepare_mac_addr_change); | |
301 | ||
302 | /** | |
303 | * eth_commit_mac_addr_change - commit mac change | |
304 | * @dev: network device | |
305 | * @p: socket address | |
306 | */ | |
307 | void eth_commit_mac_addr_change(struct net_device *dev, void *p) | |
308 | { | |
309 | struct sockaddr *addr = p; | |
310 | ||
311 | memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); | |
312 | } | |
313 | EXPORT_SYMBOL(eth_commit_mac_addr_change); | |
314 | ||
d3e01f71 SH |
315 | /** |
316 | * eth_mac_addr - set new Ethernet hardware address | |
317 | * @dev: network device | |
318 | * @p: socket address | |
2c53040f | 319 | * |
d3e01f71 SH |
320 | * Change hardware address of device. |
321 | * | |
322 | * This doesn't change hardware matching, so needs to be overridden | |
323 | * for most real devices. | |
324 | */ | |
ccad637b | 325 | int eth_mac_addr(struct net_device *dev, void *p) |
1da177e4 | 326 | { |
fa0879e3 | 327 | int ret; |
71bffe55 | 328 | |
fa0879e3 SH |
329 | ret = eth_prepare_mac_addr_change(dev, p); |
330 | if (ret < 0) | |
331 | return ret; | |
332 | eth_commit_mac_addr_change(dev, p); | |
1da177e4 LT |
333 | return 0; |
334 | } | |
ccad637b | 335 | EXPORT_SYMBOL(eth_mac_addr); |
1da177e4 | 336 | |
d3e01f71 SH |
337 | /** |
338 | * eth_change_mtu - set new MTU size | |
339 | * @dev: network device | |
340 | * @new_mtu: new Maximum Transfer Unit | |
341 | * | |
342 | * Allow changing MTU size. Needs to be overridden for devices | |
343 | * supporting jumbo frames. | |
344 | */ | |
ccad637b | 345 | int eth_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 | 346 | { |
a52ad514 | 347 | netdev_warn(dev, "%s is deprecated\n", __func__); |
1da177e4 LT |
348 | dev->mtu = new_mtu; |
349 | return 0; | |
350 | } | |
ccad637b | 351 | EXPORT_SYMBOL(eth_change_mtu); |
1da177e4 | 352 | |
ccad637b | 353 | int eth_validate_addr(struct net_device *dev) |
bada339b JG |
354 | { |
355 | if (!is_valid_ether_addr(dev->dev_addr)) | |
2ed9926e | 356 | return -EADDRNOTAVAIL; |
bada339b JG |
357 | |
358 | return 0; | |
359 | } | |
ccad637b | 360 | EXPORT_SYMBOL(eth_validate_addr); |
bada339b | 361 | |
3b04ddde SH |
362 | const struct header_ops eth_header_ops ____cacheline_aligned = { |
363 | .create = eth_header, | |
364 | .parse = eth_header_parse, | |
3b04ddde SH |
365 | .cache = eth_header_cache, |
366 | .cache_update = eth_header_cache_update, | |
ace53b2e | 367 | .parse_protocol = eth_header_parse_protocol, |
3b04ddde SH |
368 | }; |
369 | ||
d3e01f71 SH |
370 | /** |
371 | * ether_setup - setup Ethernet network device | |
372 | * @dev: network device | |
2c53040f | 373 | * |
d3e01f71 | 374 | * Fill in the fields of the device structure with Ethernet-generic values. |
1da177e4 LT |
375 | */ |
376 | void ether_setup(struct net_device *dev) | |
377 | { | |
3b04ddde | 378 | dev->header_ops = ð_header_ops; |
1da177e4 LT |
379 | dev->type = ARPHRD_ETHER; |
380 | dev->hard_header_len = ETH_HLEN; | |
217e6fa2 | 381 | dev->min_header_len = ETH_HLEN; |
46f25dff | 382 | dev->mtu = ETH_DATA_LEN; |
a52ad514 JW |
383 | dev->min_mtu = ETH_MIN_MTU; |
384 | dev->max_mtu = ETH_DATA_LEN; | |
1da177e4 | 385 | dev->addr_len = ETH_ALEN; |
d0a81f67 | 386 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; |
1da177e4 | 387 | dev->flags = IFF_BROADCAST|IFF_MULTICAST; |
31dda0ae | 388 | dev->priv_flags |= IFF_TX_SKB_SHARING; |
03d52d7c | 389 | |
afc130dd | 390 | eth_broadcast_addr(dev->broadcast); |
1da177e4 LT |
391 | |
392 | } | |
393 | EXPORT_SYMBOL(ether_setup); | |
394 | ||
395 | /** | |
36909ea4 | 396 | * alloc_etherdev_mqs - Allocates and sets up an Ethernet device |
1da177e4 | 397 | * @sizeof_priv: Size of additional driver-private structure to be allocated |
d3e01f71 | 398 | * for this Ethernet device |
36909ea4 | 399 | * @txqs: The number of TX queues this device has. |
3806b4f3 | 400 | * @rxqs: The number of RX queues this device has. |
1da177e4 | 401 | * |
d3e01f71 | 402 | * Fill in the fields of the device structure with Ethernet-generic |
1da177e4 LT |
403 | * values. Basically does everything except registering the device. |
404 | * | |
405 | * Constructs a new net device, complete with a private data area of | |
d3e01f71 | 406 | * size (sizeof_priv). A 32-byte (not bit) alignment is enforced for |
1da177e4 LT |
407 | * this private data area. |
408 | */ | |
409 | ||
36909ea4 TH |
410 | struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs, |
411 | unsigned int rxqs) | |
1da177e4 | 412 | { |
c835a677 TG |
413 | return alloc_netdev_mqs(sizeof_priv, "eth%d", NET_NAME_UNKNOWN, |
414 | ether_setup, txqs, rxqs); | |
1da177e4 | 415 | } |
36909ea4 | 416 | EXPORT_SYMBOL(alloc_etherdev_mqs); |
0795af57 | 417 | |
40be0dda RM |
418 | static void devm_free_netdev(struct device *dev, void *res) |
419 | { | |
420 | free_netdev(*(struct net_device **)res); | |
421 | } | |
422 | ||
423 | struct net_device *devm_alloc_etherdev_mqs(struct device *dev, int sizeof_priv, | |
424 | unsigned int txqs, unsigned int rxqs) | |
425 | { | |
426 | struct net_device **dr; | |
427 | struct net_device *netdev; | |
428 | ||
429 | dr = devres_alloc(devm_free_netdev, sizeof(*dr), GFP_KERNEL); | |
430 | if (!dr) | |
431 | return NULL; | |
432 | ||
433 | netdev = alloc_etherdev_mqs(sizeof_priv, txqs, rxqs); | |
434 | if (!netdev) { | |
435 | devres_free(dr); | |
436 | return NULL; | |
437 | } | |
438 | ||
439 | *dr = netdev; | |
440 | devres_add(dev, dr); | |
441 | ||
442 | return netdev; | |
443 | } | |
444 | EXPORT_SYMBOL(devm_alloc_etherdev_mqs); | |
445 | ||
7ffc49a6 MC |
446 | ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len) |
447 | { | |
ae8e9c5a | 448 | return scnprintf(buf, PAGE_SIZE, "%*phC\n", len, addr); |
7ffc49a6 MC |
449 | } |
450 | EXPORT_SYMBOL(sysfs_format_mac); | |
9b174d88 | 451 | |
d4546c25 | 452 | struct sk_buff *eth_gro_receive(struct list_head *head, struct sk_buff *skb) |
9b174d88 | 453 | { |
9b174d88 | 454 | const struct packet_offload *ptype; |
d4546c25 DM |
455 | unsigned int hlen, off_eth; |
456 | struct sk_buff *pp = NULL; | |
457 | struct ethhdr *eh, *eh2; | |
458 | struct sk_buff *p; | |
9b174d88 JG |
459 | __be16 type; |
460 | int flush = 1; | |
461 | ||
462 | off_eth = skb_gro_offset(skb); | |
463 | hlen = off_eth + sizeof(*eh); | |
464 | eh = skb_gro_header_fast(skb, off_eth); | |
465 | if (skb_gro_header_hard(skb, hlen)) { | |
466 | eh = skb_gro_header_slow(skb, hlen, off_eth); | |
467 | if (unlikely(!eh)) | |
468 | goto out; | |
469 | } | |
470 | ||
471 | flush = 0; | |
472 | ||
d4546c25 | 473 | list_for_each_entry(p, head, list) { |
9b174d88 JG |
474 | if (!NAPI_GRO_CB(p)->same_flow) |
475 | continue; | |
476 | ||
477 | eh2 = (struct ethhdr *)(p->data + off_eth); | |
478 | if (compare_ether_header(eh, eh2)) { | |
479 | NAPI_GRO_CB(p)->same_flow = 0; | |
480 | continue; | |
481 | } | |
482 | } | |
483 | ||
484 | type = eh->h_proto; | |
485 | ||
486 | rcu_read_lock(); | |
487 | ptype = gro_find_receive_by_type(type); | |
488 | if (ptype == NULL) { | |
489 | flush = 1; | |
490 | goto out_unlock; | |
491 | } | |
492 | ||
493 | skb_gro_pull(skb, sizeof(*eh)); | |
494 | skb_gro_postpull_rcsum(skb, eh, sizeof(*eh)); | |
fcd91dd4 | 495 | pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); |
9b174d88 JG |
496 | |
497 | out_unlock: | |
498 | rcu_read_unlock(); | |
499 | out: | |
5f114163 | 500 | skb_gro_flush_final(skb, pp, flush); |
9b174d88 JG |
501 | |
502 | return pp; | |
503 | } | |
504 | EXPORT_SYMBOL(eth_gro_receive); | |
505 | ||
506 | int eth_gro_complete(struct sk_buff *skb, int nhoff) | |
507 | { | |
508 | struct ethhdr *eh = (struct ethhdr *)(skb->data + nhoff); | |
509 | __be16 type = eh->h_proto; | |
510 | struct packet_offload *ptype; | |
511 | int err = -ENOSYS; | |
512 | ||
513 | if (skb->encapsulation) | |
514 | skb_set_inner_mac_header(skb, nhoff); | |
515 | ||
516 | rcu_read_lock(); | |
517 | ptype = gro_find_complete_by_type(type); | |
518 | if (ptype != NULL) | |
519 | err = ptype->callbacks.gro_complete(skb, nhoff + | |
520 | sizeof(struct ethhdr)); | |
521 | ||
522 | rcu_read_unlock(); | |
523 | return err; | |
524 | } | |
525 | EXPORT_SYMBOL(eth_gro_complete); | |
526 | ||
527 | static struct packet_offload eth_packet_offload __read_mostly = { | |
528 | .type = cpu_to_be16(ETH_P_TEB), | |
bdef7de4 | 529 | .priority = 10, |
9b174d88 JG |
530 | .callbacks = { |
531 | .gro_receive = eth_gro_receive, | |
532 | .gro_complete = eth_gro_complete, | |
533 | }, | |
534 | }; | |
535 | ||
536 | static int __init eth_offload_init(void) | |
537 | { | |
538 | dev_add_offload(ð_packet_offload); | |
539 | ||
540 | return 0; | |
541 | } | |
542 | ||
543 | fs_initcall(eth_offload_init); | |
c7f5d105 DM |
544 | |
545 | unsigned char * __weak arch_get_platform_mac_address(void) | |
546 | { | |
547 | return NULL; | |
548 | } | |
549 | ||
550 | int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr) | |
551 | { | |
552 | const unsigned char *addr; | |
553 | struct device_node *dp; | |
554 | ||
555 | if (dev_is_pci(dev)) | |
556 | dp = pci_device_to_OF_node(to_pci_dev(dev)); | |
557 | else | |
558 | dp = dev->of_node; | |
559 | ||
560 | addr = NULL; | |
561 | if (dp) | |
562 | addr = of_get_mac_address(dp); | |
a51645f7 | 563 | if (IS_ERR_OR_NULL(addr)) |
c7f5d105 DM |
564 | addr = arch_get_platform_mac_address(); |
565 | ||
566 | if (!addr) | |
567 | return -ENODEV; | |
568 | ||
569 | ether_addr_copy(mac_addr, addr); | |
570 | return 0; | |
571 | } | |
572 | EXPORT_SYMBOL(eth_platform_get_mac_address); | |
0e839df9 BG |
573 | |
574 | /** | |
575 | * Obtain the MAC address from an nvmem cell named 'mac-address' associated | |
576 | * with given device. | |
577 | * | |
578 | * @dev: Device with which the mac-address cell is associated. | |
579 | * @addrbuf: Buffer to which the MAC address will be copied on success. | |
580 | * | |
581 | * Returns 0 on success or a negative error number on failure. | |
582 | */ | |
583 | int nvmem_get_mac_address(struct device *dev, void *addrbuf) | |
584 | { | |
585 | struct nvmem_cell *cell; | |
586 | const void *mac; | |
587 | size_t len; | |
588 | ||
589 | cell = nvmem_cell_get(dev, "mac-address"); | |
590 | if (IS_ERR(cell)) | |
591 | return PTR_ERR(cell); | |
592 | ||
593 | mac = nvmem_cell_read(cell, &len); | |
594 | nvmem_cell_put(cell); | |
595 | ||
596 | if (IS_ERR(mac)) | |
597 | return PTR_ERR(mac); | |
598 | ||
599 | if (len != ETH_ALEN || !is_valid_ether_addr(mac)) { | |
600 | kfree(mac); | |
601 | return -EINVAL; | |
602 | } | |
603 | ||
604 | ether_addr_copy(addrbuf, mac); | |
605 | kfree(mac); | |
606 | ||
607 | return 0; | |
608 | } | |
609 | EXPORT_SYMBOL(nvmem_get_mac_address); |