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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 <net/dst.h>
55#include <net/arp.h>
56#include <net/sock.h>
57#include <net/ipv6.h>
58#include <net/ip.h>
59#include <net/dsa.h>
60#include <net/flow_dissector.h>
61#include <net/gro.h>
62#include <linux/uaccess.h>
63#include <net/pkt_sched.h>
64
65__setup("ether=", netdev_boot_setup);
66
67/**
68 * eth_header - create the Ethernet header
69 * @skb: buffer to alter
70 * @dev: source device
71 * @type: Ethernet type field
72 * @daddr: destination address (NULL leave destination address)
73 * @saddr: source address (NULL use device source address)
74 * @len: packet length (<= skb->len)
75 *
76 *
77 * Set the protocol type. For a packet of type ETH_P_802_3/2 we put the length
78 * in here instead.
79 */
80int eth_header(struct sk_buff *skb, struct net_device *dev,
81 unsigned short type,
82 const void *daddr, const void *saddr, unsigned int len)
83{
84 struct ethhdr *eth = skb_push(skb, ETH_HLEN);
85
86 if (type != ETH_P_802_3 && type != ETH_P_802_2)
87 eth->h_proto = htons(type);
88 else
89 eth->h_proto = htons(len);
90
91 /*
92 * Set the source hardware address.
93 */
94
95 if (!saddr)
96 saddr = dev->dev_addr;
97 memcpy(eth->h_source, saddr, ETH_ALEN);
98
99 if (daddr) {
100 memcpy(eth->h_dest, daddr, ETH_ALEN);
101 return ETH_HLEN;
102 }
103
104 /*
105 * Anyway, the loopback-device should never use this function...
106 */
107
108 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) {
109 eth_zero_addr(eth->h_dest);
110 return ETH_HLEN;
111 }
112
113 return -ETH_HLEN;
114}
115EXPORT_SYMBOL(eth_header);
116
117/**
118 * eth_get_headlen - determine the length of header for an ethernet frame
119 * @dev: pointer to network device
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 */
126u32 eth_get_headlen(const struct net_device *dev, const void *data, u32 len)
127{
128 const unsigned int flags = FLOW_DISSECTOR_F_PARSE_1ST_FRAG;
129 const struct ethhdr *eth = (const struct ethhdr *)data;
130 struct flow_keys_basic keys;
131
132 /* this should never happen, but better safe than sorry */
133 if (unlikely(len < sizeof(*eth)))
134 return len;
135
136 /* parse any remaining L2/L3 headers, check for L4 */
137 if (!skb_flow_dissect_flow_keys_basic(dev_net(dev), NULL, &keys, data,
138 eth->h_proto, sizeof(*eth),
139 len, flags))
140 return max_t(u32, keys.control.thoff, sizeof(*eth));
141
142 /* parse for any L4 headers */
143 return min_t(u32, __skb_get_poff(NULL, data, &keys, len), len);
144}
145EXPORT_SYMBOL(eth_get_headlen);
146
147/**
148 * eth_type_trans - determine the packet's protocol ID.
149 * @skb: received socket data
150 * @dev: receiving network device
151 *
152 * The rule here is that we
153 * assume 802.3 if the type field is short enough to be a length.
154 * This is normal practice and works for any 'now in use' protocol.
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(!ether_addr_equal_64bits(eth->h_dest,
169 dev->dev_addr))) {
170 if (unlikely(is_multicast_ether_addr_64bits(eth->h_dest))) {
171 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
172 skb->pkt_type = PACKET_BROADCAST;
173 else
174 skb->pkt_type = PACKET_MULTICAST;
175 } else {
176 skb->pkt_type = PACKET_OTHERHOST;
177 }
178 }
179
180 /*
181 * Some variants of DSA tagging don't have an ethertype field
182 * at all, so we check here whether one of those tagging
183 * variants has been configured on the receiving interface,
184 * and if so, set skb->protocol without looking at the packet.
185 * The DSA tagging protocol may be able to decode some but not all
186 * traffic (for example only for management). In that case give it the
187 * option to filter the packets from which it can decode source port
188 * information.
189 */
190 if (unlikely(netdev_uses_dsa(dev)) && dsa_can_decode(skb, dev))
191 return htons(ETH_P_XDSA);
192
193 if (likely(eth_proto_is_802_3(eth->h_proto)))
194 return eth->h_proto;
195
196 /*
197 * This is a magic hack to spot IPX packets. Older Novell breaks
198 * the protocol design and runs IPX over 802.3 without an 802.2 LLC
199 * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
200 * won't work for fault tolerant netware but does for the rest.
201 */
202 sap = skb_header_pointer(skb, 0, sizeof(*sap), &_service_access_point);
203 if (sap && *sap == 0xFFFF)
204 return htons(ETH_P_802_3);
205
206 /*
207 * Real 802.2 LLC
208 */
209 return htons(ETH_P_802_2);
210}
211EXPORT_SYMBOL(eth_type_trans);
212
213/**
214 * eth_header_parse - extract hardware address from packet
215 * @skb: packet to extract header from
216 * @haddr: destination buffer
217 */
218int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr)
219{
220 const struct ethhdr *eth = eth_hdr(skb);
221 memcpy(haddr, eth->h_source, ETH_ALEN);
222 return ETH_ALEN;
223}
224EXPORT_SYMBOL(eth_header_parse);
225
226/**
227 * eth_header_cache - fill cache entry from neighbour
228 * @neigh: source neighbour
229 * @hh: destination cache entry
230 * @type: Ethernet type field
231 *
232 * Create an Ethernet header template from the neighbour.
233 */
234int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh, __be16 type)
235{
236 struct ethhdr *eth;
237 const struct net_device *dev = neigh->dev;
238
239 eth = (struct ethhdr *)
240 (((u8 *) hh->hh_data) + (HH_DATA_OFF(sizeof(*eth))));
241
242 if (type == htons(ETH_P_802_3))
243 return -1;
244
245 eth->h_proto = type;
246 memcpy(eth->h_source, dev->dev_addr, ETH_ALEN);
247 memcpy(eth->h_dest, neigh->ha, ETH_ALEN);
248
249 /* Pairs with READ_ONCE() in neigh_resolve_output(),
250 * neigh_hh_output() and neigh_update_hhs().
251 */
252 smp_store_release(&hh->hh_len, ETH_HLEN);
253
254 return 0;
255}
256EXPORT_SYMBOL(eth_header_cache);
257
258/**
259 * eth_header_cache_update - update cache entry
260 * @hh: destination cache entry
261 * @dev: network device
262 * @haddr: new hardware address
263 *
264 * Called by Address Resolution module to notify changes in address.
265 */
266void eth_header_cache_update(struct hh_cache *hh,
267 const struct net_device *dev,
268 const unsigned char *haddr)
269{
270 memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)),
271 haddr, ETH_ALEN);
272}
273EXPORT_SYMBOL(eth_header_cache_update);
274
275/**
276 * eth_header_parse_protocol - extract protocol from L2 header
277 * @skb: packet to extract protocol from
278 */
279__be16 eth_header_parse_protocol(const struct sk_buff *skb)
280{
281 const struct ethhdr *eth = eth_hdr(skb);
282
283 return eth->h_proto;
284}
285EXPORT_SYMBOL(eth_header_parse_protocol);
286
287/**
288 * eth_prepare_mac_addr_change - prepare for mac change
289 * @dev: network device
290 * @p: socket address
291 */
292int eth_prepare_mac_addr_change(struct net_device *dev, void *p)
293{
294 struct sockaddr *addr = p;
295
296 if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
297 return -EBUSY;
298 if (!is_valid_ether_addr(addr->sa_data))
299 return -EADDRNOTAVAIL;
300 return 0;
301}
302EXPORT_SYMBOL(eth_prepare_mac_addr_change);
303
304/**
305 * eth_commit_mac_addr_change - commit mac change
306 * @dev: network device
307 * @p: socket address
308 */
309void eth_commit_mac_addr_change(struct net_device *dev, void *p)
310{
311 struct sockaddr *addr = p;
312
313 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
314}
315EXPORT_SYMBOL(eth_commit_mac_addr_change);
316
317/**
318 * eth_mac_addr - set new Ethernet hardware address
319 * @dev: network device
320 * @p: socket address
321 *
322 * Change hardware address of device.
323 *
324 * This doesn't change hardware matching, so needs to be overridden
325 * for most real devices.
326 */
327int eth_mac_addr(struct net_device *dev, void *p)
328{
329 int ret;
330
331 ret = eth_prepare_mac_addr_change(dev, p);
332 if (ret < 0)
333 return ret;
334 eth_commit_mac_addr_change(dev, p);
335 return 0;
336}
337EXPORT_SYMBOL(eth_mac_addr);
338
339int eth_validate_addr(struct net_device *dev)
340{
341 if (!is_valid_ether_addr(dev->dev_addr))
342 return -EADDRNOTAVAIL;
343
344 return 0;
345}
346EXPORT_SYMBOL(eth_validate_addr);
347
348const struct header_ops eth_header_ops ____cacheline_aligned = {
349 .create = eth_header,
350 .parse = eth_header_parse,
351 .cache = eth_header_cache,
352 .cache_update = eth_header_cache_update,
353 .parse_protocol = eth_header_parse_protocol,
354};
355
356/**
357 * ether_setup - setup Ethernet network device
358 * @dev: network device
359 *
360 * Fill in the fields of the device structure with Ethernet-generic values.
361 */
362void ether_setup(struct net_device *dev)
363{
364 dev->header_ops = ð_header_ops;
365 dev->type = ARPHRD_ETHER;
366 dev->hard_header_len = ETH_HLEN;
367 dev->min_header_len = ETH_HLEN;
368 dev->mtu = ETH_DATA_LEN;
369 dev->min_mtu = ETH_MIN_MTU;
370 dev->max_mtu = ETH_DATA_LEN;
371 dev->addr_len = ETH_ALEN;
372 dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
373 dev->flags = IFF_BROADCAST|IFF_MULTICAST;
374 dev->priv_flags |= IFF_TX_SKB_SHARING;
375
376 eth_broadcast_addr(dev->broadcast);
377
378}
379EXPORT_SYMBOL(ether_setup);
380
381/**
382 * alloc_etherdev_mqs - Allocates and sets up an Ethernet device
383 * @sizeof_priv: Size of additional driver-private structure to be allocated
384 * for this Ethernet device
385 * @txqs: The number of TX queues this device has.
386 * @rxqs: The number of RX queues this device has.
387 *
388 * Fill in the fields of the device structure with Ethernet-generic
389 * values. Basically does everything except registering the device.
390 *
391 * Constructs a new net device, complete with a private data area of
392 * size (sizeof_priv). A 32-byte (not bit) alignment is enforced for
393 * this private data area.
394 */
395
396struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs,
397 unsigned int rxqs)
398{
399 return alloc_netdev_mqs(sizeof_priv, "eth%d", NET_NAME_UNKNOWN,
400 ether_setup, txqs, rxqs);
401}
402EXPORT_SYMBOL(alloc_etherdev_mqs);
403
404ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len)
405{
406 return scnprintf(buf, PAGE_SIZE, "%*phC\n", len, addr);
407}
408EXPORT_SYMBOL(sysfs_format_mac);
409
410struct sk_buff *eth_gro_receive(struct list_head *head, struct sk_buff *skb)
411{
412 const struct packet_offload *ptype;
413 unsigned int hlen, off_eth;
414 struct sk_buff *pp = NULL;
415 struct ethhdr *eh, *eh2;
416 struct sk_buff *p;
417 __be16 type;
418 int flush = 1;
419
420 off_eth = skb_gro_offset(skb);
421 hlen = off_eth + sizeof(*eh);
422 eh = skb_gro_header_fast(skb, off_eth);
423 if (skb_gro_header_hard(skb, hlen)) {
424 eh = skb_gro_header_slow(skb, hlen, off_eth);
425 if (unlikely(!eh))
426 goto out;
427 }
428
429 flush = 0;
430
431 list_for_each_entry(p, head, list) {
432 if (!NAPI_GRO_CB(p)->same_flow)
433 continue;
434
435 eh2 = (struct ethhdr *)(p->data + off_eth);
436 if (compare_ether_header(eh, eh2)) {
437 NAPI_GRO_CB(p)->same_flow = 0;
438 continue;
439 }
440 }
441
442 type = eh->h_proto;
443
444 rcu_read_lock();
445 ptype = gro_find_receive_by_type(type);
446 if (ptype == NULL) {
447 flush = 1;
448 goto out_unlock;
449 }
450
451 skb_gro_pull(skb, sizeof(*eh));
452 skb_gro_postpull_rcsum(skb, eh, sizeof(*eh));
453
454 pp = indirect_call_gro_receive_inet(ptype->callbacks.gro_receive,
455 ipv6_gro_receive, inet_gro_receive,
456 head, skb);
457
458out_unlock:
459 rcu_read_unlock();
460out:
461 skb_gro_flush_final(skb, pp, flush);
462
463 return pp;
464}
465EXPORT_SYMBOL(eth_gro_receive);
466
467int eth_gro_complete(struct sk_buff *skb, int nhoff)
468{
469 struct ethhdr *eh = (struct ethhdr *)(skb->data + nhoff);
470 __be16 type = eh->h_proto;
471 struct packet_offload *ptype;
472 int err = -ENOSYS;
473
474 if (skb->encapsulation)
475 skb_set_inner_mac_header(skb, nhoff);
476
477 rcu_read_lock();
478 ptype = gro_find_complete_by_type(type);
479 if (ptype != NULL)
480 err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete,
481 ipv6_gro_complete, inet_gro_complete,
482 skb, nhoff + sizeof(*eh));
483
484 rcu_read_unlock();
485 return err;
486}
487EXPORT_SYMBOL(eth_gro_complete);
488
489static struct packet_offload eth_packet_offload __read_mostly = {
490 .type = cpu_to_be16(ETH_P_TEB),
491 .priority = 10,
492 .callbacks = {
493 .gro_receive = eth_gro_receive,
494 .gro_complete = eth_gro_complete,
495 },
496};
497
498static int __init eth_offload_init(void)
499{
500 dev_add_offload(ð_packet_offload);
501
502 return 0;
503}
504
505fs_initcall(eth_offload_init);
506
507unsigned char * __weak arch_get_platform_mac_address(void)
508{
509 return NULL;
510}
511
512int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr)
513{
514 unsigned char *addr;
515 int ret;
516
517 ret = of_get_mac_address(dev->of_node, mac_addr);
518 if (!ret)
519 return 0;
520
521 addr = arch_get_platform_mac_address();
522 if (!addr)
523 return -ENODEV;
524
525 ether_addr_copy(mac_addr, addr);
526
527 return 0;
528}
529EXPORT_SYMBOL(eth_platform_get_mac_address);
530
531/**
532 * nvmem_get_mac_address - Obtain the MAC address from an nvmem cell named
533 * 'mac-address' associated with given device.
534 *
535 * @dev: Device with which the mac-address cell is associated.
536 * @addrbuf: Buffer to which the MAC address will be copied on success.
537 *
538 * Returns 0 on success or a negative error number on failure.
539 */
540int nvmem_get_mac_address(struct device *dev, void *addrbuf)
541{
542 struct nvmem_cell *cell;
543 const void *mac;
544 size_t len;
545
546 cell = nvmem_cell_get(dev, "mac-address");
547 if (IS_ERR(cell))
548 return PTR_ERR(cell);
549
550 mac = nvmem_cell_read(cell, &len);
551 nvmem_cell_put(cell);
552
553 if (IS_ERR(mac))
554 return PTR_ERR(mac);
555
556 if (len != ETH_ALEN || !is_valid_ether_addr(mac)) {
557 kfree(mac);
558 return -EINVAL;
559 }
560
561 ether_addr_copy(addrbuf, mac);
562 kfree(mac);
563
564 return 0;
565}
566EXPORT_SYMBOL(nvmem_get_mac_address);
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 *
10 * Authors: Ross Biro
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>
15 *
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.
22 * Tegge : Arp bug fixes.
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>
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 * eth_header - create the Ethernet header
71 * @skb: buffer to alter
72 * @dev: source device
73 * @type: Ethernet type field
74 * @daddr: destination address (NULL leave destination address)
75 * @saddr: source address (NULL use device source address)
76 * @len: packet length (<= skb->len)
77 *
78 *
79 * Set the protocol type. For a packet of type ETH_P_802_3/2 we put the length
80 * in here instead.
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 * Set the source hardware address.
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 * Anyway, the loopback-device should never use this function...
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 * eth_get_headlen - determine the length of header for an ethernet frame
121 * @data: pointer to start of frame
122 * @len: total length of frame
123 *
124 * Make a best effort attempt to pull the length for all of the headers for
125 * a given frame in a linear buffer.
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 /* this should never happen, but better safe than sorry */
134 if (unlikely(len < sizeof(*eth)))
135 return len;
136
137 /* parse any remaining L2/L3 headers, check for L4 */
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 /* parse for any L4 headers */
143 return min_t(u32, __skb_get_poff(NULL, data, &keys, len), len);
144}
145EXPORT_SYMBOL(eth_get_headlen);
146
147/**
148 * eth_type_trans - determine the packet's protocol ID.
149 * @skb: received socket data
150 * @dev: receiving network device
151 *
152 * The rule here is that we
153 * assume 802.3 if the type field is short enough to be a length.
154 * This is normal practice and works for any 'now in use' protocol.
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 * Some variants of DSA tagging don't have an ethertype field
180 * at all, so we check here whether one of those tagging
181 * variants has been configured on the receiving interface,
182 * and if so, set skb->protocol without looking at the packet.
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 * This is a magic hack to spot IPX packets. Older Novell breaks
192 * the protocol design and runs IPX over 802.3 without an 802.2 LLC
193 * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
194 * won't work for fault tolerant netware but does for the rest.
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 * Real 802.2 LLC
202 */
203 return htons(ETH_P_802_2);
204}
205EXPORT_SYMBOL(eth_type_trans);
206
207/**
208 * eth_header_parse - extract hardware address from packet
209 * @skb: packet to extract header from
210 * @haddr: destination buffer
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
220/**
221 * eth_header_cache - fill cache entry from neighbour
222 * @neigh: source neighbour
223 * @hh: destination cache entry
224 * @type: Ethernet type field
225 *
226 * Create an Ethernet header template from the neighbour.
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/**
248 * eth_header_cache_update - update cache entry
249 * @hh: destination cache entry
250 * @dev: network device
251 * @haddr: new hardware address
252 *
253 * Called by Address Resolution module to notify changes in address.
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 * eth_prepare_mac_addr_change - prepare for mac change
266 * @dev: network device
267 * @p: socket address
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 * eth_commit_mac_addr_change - commit mac change
283 * @dev: network device
284 * @p: socket address
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
294/**
295 * eth_mac_addr - set new Ethernet hardware address
296 * @dev: network device
297 * @p: socket address
298 *
299 * Change hardware address of device.
300 *
301 * This doesn't change hardware matching, so needs to be overridden
302 * for most real devices.
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 * eth_change_mtu - set new MTU size
318 * @dev: network device
319 * @new_mtu: new Maximum Transfer Unit
320 *
321 * Allow changing MTU size. Needs to be overridden for devices
322 * supporting jumbo frames.
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 * ether_setup - setup Ethernet network device
350 * @dev: network device
351 *
352 * Fill in the fields of the device structure with Ethernet-generic values.
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
373/**
374 * alloc_etherdev_mqs - Allocates and sets up an Ethernet device
375 * @sizeof_priv: Size of additional driver-private structure to be allocated
376 * for this Ethernet device
377 * @txqs: The number of TX queues this device has.
378 * @rxqs: The number of RX queues this device has.
379 *
380 * Fill in the fields of the device structure with Ethernet-generic
381 * values. Basically does everything except registering the device.
382 *
383 * Constructs a new net device, complete with a private data area of
384 * size (sizeof_priv). A 32-byte (not bit) alignment is enforced for
385 * this private data area.
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);