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40#include <linux/module.h>
41#include <linux/types.h>
42#include <linux/kernel.h>
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>
53#include <linux/init.h>
54#include <linux/if_ether.h>
55#include <linux/of_net.h>
56#include <linux/pci.h>
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>
62#include <net/dsa.h>
63#include <net/flow_dissector.h>
64#include <linux/uaccess.h>
65#include <net/pkt_sched.h>
66
67__setup("ether=", netdev_boot_setup);
68
69
70
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80
81
82int eth_header(struct sk_buff *skb, struct net_device *dev,
83 unsigned short type,
84 const void *daddr, const void *saddr, unsigned int len)
85{
86 struct ethhdr *eth = skb_push(skb, ETH_HLEN);
87
88 if (type != ETH_P_802_3 && type != ETH_P_802_2)
89 eth->h_proto = htons(type);
90 else
91 eth->h_proto = htons(len);
92
93
94
95
96
97 if (!saddr)
98 saddr = dev->dev_addr;
99 memcpy(eth->h_source, saddr, ETH_ALEN);
100
101 if (daddr) {
102 memcpy(eth->h_dest, daddr, ETH_ALEN);
103 return ETH_HLEN;
104 }
105
106
107
108
109
110 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) {
111 eth_zero_addr(eth->h_dest);
112 return ETH_HLEN;
113 }
114
115 return -ETH_HLEN;
116}
117EXPORT_SYMBOL(eth_header);
118
119
120
121
122
123
124
125
126
127u32 eth_get_headlen(void *data, unsigned int len)
128{
129 const unsigned int flags = FLOW_DISSECTOR_F_PARSE_1ST_FRAG;
130 const struct ethhdr *eth = (const struct ethhdr *)data;
131 struct flow_keys keys;
132
133
134 if (unlikely(len < sizeof(*eth)))
135 return len;
136
137
138 if (!skb_flow_dissect_flow_keys_buf(&keys, data, eth->h_proto,
139 sizeof(*eth), len, flags))
140 return max_t(u32, keys.control.thoff, sizeof(*eth));
141
142
143 return min_t(u32, __skb_get_poff(NULL, data, &keys, len), len);
144}
145EXPORT_SYMBOL(eth_get_headlen);
146
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154
155
156__be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
157{
158 unsigned short _service_access_point;
159 const unsigned short *sap;
160 const struct ethhdr *eth;
161
162 skb->dev = dev;
163 skb_reset_mac_header(skb);
164
165 eth = (struct ethhdr *)skb->data;
166 skb_pull_inline(skb, ETH_HLEN);
167
168 if (unlikely(is_multicast_ether_addr_64bits(eth->h_dest))) {
169 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
170 skb->pkt_type = PACKET_BROADCAST;
171 else
172 skb->pkt_type = PACKET_MULTICAST;
173 }
174 else if (unlikely(!ether_addr_equal_64bits(eth->h_dest,
175 dev->dev_addr)))
176 skb->pkt_type = PACKET_OTHERHOST;
177
178
179
180
181
182
183
184 if (unlikely(netdev_uses_dsa(dev)))
185 return htons(ETH_P_XDSA);
186
187 if (likely(eth_proto_is_802_3(eth->h_proto)))
188 return eth->h_proto;
189
190
191
192
193
194
195
196 sap = skb_header_pointer(skb, 0, sizeof(*sap), &_service_access_point);
197 if (sap && *sap == 0xFFFF)
198 return htons(ETH_P_802_3);
199
200
201
202
203 return htons(ETH_P_802_2);
204}
205EXPORT_SYMBOL(eth_type_trans);
206
207
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210
211
212int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr)
213{
214 const struct ethhdr *eth = eth_hdr(skb);
215 memcpy(haddr, eth->h_source, ETH_ALEN);
216 return ETH_ALEN;
217}
218EXPORT_SYMBOL(eth_header_parse);
219
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226
227
228int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh, __be16 type)
229{
230 struct ethhdr *eth;
231 const struct net_device *dev = neigh->dev;
232
233 eth = (struct ethhdr *)
234 (((u8 *) hh->hh_data) + (HH_DATA_OFF(sizeof(*eth))));
235
236 if (type == htons(ETH_P_802_3))
237 return -1;
238
239 eth->h_proto = type;
240 memcpy(eth->h_source, dev->dev_addr, ETH_ALEN);
241 memcpy(eth->h_dest, neigh->ha, ETH_ALEN);
242 hh->hh_len = ETH_HLEN;
243 return 0;
244}
245EXPORT_SYMBOL(eth_header_cache);
246
247
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249
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251
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253
254
255void eth_header_cache_update(struct hh_cache *hh,
256 const struct net_device *dev,
257 const unsigned char *haddr)
258{
259 memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)),
260 haddr, ETH_ALEN);
261}
262EXPORT_SYMBOL(eth_header_cache_update);
263
264
265
266
267
268
269int eth_prepare_mac_addr_change(struct net_device *dev, void *p)
270{
271 struct sockaddr *addr = p;
272
273 if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
274 return -EBUSY;
275 if (!is_valid_ether_addr(addr->sa_data))
276 return -EADDRNOTAVAIL;
277 return 0;
278}
279EXPORT_SYMBOL(eth_prepare_mac_addr_change);
280
281
282
283
284
285
286void eth_commit_mac_addr_change(struct net_device *dev, void *p)
287{
288 struct sockaddr *addr = p;
289
290 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
291}
292EXPORT_SYMBOL(eth_commit_mac_addr_change);
293
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302
303
304int eth_mac_addr(struct net_device *dev, void *p)
305{
306 int ret;
307
308 ret = eth_prepare_mac_addr_change(dev, p);
309 if (ret < 0)
310 return ret;
311 eth_commit_mac_addr_change(dev, p);
312 return 0;
313}
314EXPORT_SYMBOL(eth_mac_addr);
315
316
317
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319
320
321
322
323
324int eth_change_mtu(struct net_device *dev, int new_mtu)
325{
326 netdev_warn(dev, "%s is deprecated\n", __func__);
327 dev->mtu = new_mtu;
328 return 0;
329}
330EXPORT_SYMBOL(eth_change_mtu);
331
332int eth_validate_addr(struct net_device *dev)
333{
334 if (!is_valid_ether_addr(dev->dev_addr))
335 return -EADDRNOTAVAIL;
336
337 return 0;
338}
339EXPORT_SYMBOL(eth_validate_addr);
340
341const struct header_ops eth_header_ops ____cacheline_aligned = {
342 .create = eth_header,
343 .parse = eth_header_parse,
344 .cache = eth_header_cache,
345 .cache_update = eth_header_cache_update,
346};
347
348
349
350
351
352
353
354void ether_setup(struct net_device *dev)
355{
356 dev->header_ops = ð_header_ops;
357 dev->type = ARPHRD_ETHER;
358 dev->hard_header_len = ETH_HLEN;
359 dev->min_header_len = ETH_HLEN;
360 dev->mtu = ETH_DATA_LEN;
361 dev->min_mtu = ETH_MIN_MTU;
362 dev->max_mtu = ETH_DATA_LEN;
363 dev->addr_len = ETH_ALEN;
364 dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
365 dev->flags = IFF_BROADCAST|IFF_MULTICAST;
366 dev->priv_flags |= IFF_TX_SKB_SHARING;
367
368 eth_broadcast_addr(dev->broadcast);
369
370}
371EXPORT_SYMBOL(ether_setup);
372
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386
387
388struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs,
389 unsigned int rxqs)
390{
391 return alloc_netdev_mqs(sizeof_priv, "eth%d", NET_NAME_UNKNOWN,
392 ether_setup, txqs, rxqs);
393}
394EXPORT_SYMBOL(alloc_etherdev_mqs);
395
396static void devm_free_netdev(struct device *dev, void *res)
397{
398 free_netdev(*(struct net_device **)res);
399}
400
401struct net_device *devm_alloc_etherdev_mqs(struct device *dev, int sizeof_priv,
402 unsigned int txqs, unsigned int rxqs)
403{
404 struct net_device **dr;
405 struct net_device *netdev;
406
407 dr = devres_alloc(devm_free_netdev, sizeof(*dr), GFP_KERNEL);
408 if (!dr)
409 return NULL;
410
411 netdev = alloc_etherdev_mqs(sizeof_priv, txqs, rxqs);
412 if (!netdev) {
413 devres_free(dr);
414 return NULL;
415 }
416
417 *dr = netdev;
418 devres_add(dev, dr);
419
420 return netdev;
421}
422EXPORT_SYMBOL(devm_alloc_etherdev_mqs);
423
424ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len)
425{
426 return scnprintf(buf, PAGE_SIZE, "%*phC\n", len, addr);
427}
428EXPORT_SYMBOL(sysfs_format_mac);
429
430struct sk_buff **eth_gro_receive(struct sk_buff **head,
431 struct sk_buff *skb)
432{
433 struct sk_buff *p, **pp = NULL;
434 struct ethhdr *eh, *eh2;
435 unsigned int hlen, off_eth;
436 const struct packet_offload *ptype;
437 __be16 type;
438 int flush = 1;
439
440 off_eth = skb_gro_offset(skb);
441 hlen = off_eth + sizeof(*eh);
442 eh = skb_gro_header_fast(skb, off_eth);
443 if (skb_gro_header_hard(skb, hlen)) {
444 eh = skb_gro_header_slow(skb, hlen, off_eth);
445 if (unlikely(!eh))
446 goto out;
447 }
448
449 flush = 0;
450
451 for (p = *head; p; p = p->next) {
452 if (!NAPI_GRO_CB(p)->same_flow)
453 continue;
454
455 eh2 = (struct ethhdr *)(p->data + off_eth);
456 if (compare_ether_header(eh, eh2)) {
457 NAPI_GRO_CB(p)->same_flow = 0;
458 continue;
459 }
460 }
461
462 type = eh->h_proto;
463
464 rcu_read_lock();
465 ptype = gro_find_receive_by_type(type);
466 if (ptype == NULL) {
467 flush = 1;
468 goto out_unlock;
469 }
470
471 skb_gro_pull(skb, sizeof(*eh));
472 skb_gro_postpull_rcsum(skb, eh, sizeof(*eh));
473 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
474
475out_unlock:
476 rcu_read_unlock();
477out:
478 skb_gro_flush_final(skb, pp, flush);
479
480 return pp;
481}
482EXPORT_SYMBOL(eth_gro_receive);
483
484int eth_gro_complete(struct sk_buff *skb, int nhoff)
485{
486 struct ethhdr *eh = (struct ethhdr *)(skb->data + nhoff);
487 __be16 type = eh->h_proto;
488 struct packet_offload *ptype;
489 int err = -ENOSYS;
490
491 if (skb->encapsulation)
492 skb_set_inner_mac_header(skb, nhoff);
493
494 rcu_read_lock();
495 ptype = gro_find_complete_by_type(type);
496 if (ptype != NULL)
497 err = ptype->callbacks.gro_complete(skb, nhoff +
498 sizeof(struct ethhdr));
499
500 rcu_read_unlock();
501 return err;
502}
503EXPORT_SYMBOL(eth_gro_complete);
504
505static struct packet_offload eth_packet_offload __read_mostly = {
506 .type = cpu_to_be16(ETH_P_TEB),
507 .priority = 10,
508 .callbacks = {
509 .gro_receive = eth_gro_receive,
510 .gro_complete = eth_gro_complete,
511 },
512};
513
514static int __init eth_offload_init(void)
515{
516 dev_add_offload(ð_packet_offload);
517
518 return 0;
519}
520
521fs_initcall(eth_offload_init);
522
523unsigned char * __weak arch_get_platform_mac_address(void)
524{
525 return NULL;
526}
527
528int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr)
529{
530 const unsigned char *addr;
531 struct device_node *dp;
532
533 if (dev_is_pci(dev))
534 dp = pci_device_to_OF_node(to_pci_dev(dev));
535 else
536 dp = dev->of_node;
537
538 addr = NULL;
539 if (dp)
540 addr = of_get_mac_address(dp);
541 if (!addr)
542 addr = arch_get_platform_mac_address();
543
544 if (!addr)
545 return -ENODEV;
546
547 ether_addr_copy(mac_addr, addr);
548 return 0;
549}
550EXPORT_SYMBOL(eth_platform_get_mac_address);
551