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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Jesper Juhl02c30a82005-05-05 16:16:16 -070010 * Authors: Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * 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>
YOSHIFUJI Hideaki03d52d72007-02-09 23:24:44 +090015 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070016 * 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.
YOSHIFUJI Hideaki03d52d72007-02-09 23:24:44 +090022 * Tegge : Arp bug fixes.
Linus Torvalds1da177e2005-04-16 15:20:36 -070023 * 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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#include <linux/init.h>
Kris Katterjohn46f25df2006-01-05 16:35:42 -080054#include <linux/if_ether.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#include <net/dst.h>
56#include <net/arp.h>
57#include <net/sock.h>
58#include <net/ipv6.h>
59#include <net/ip.h>
Lennert Buytenhekcf85d082008-10-07 13:45:02 +000060#include <net/dsa.h>
Jiri Pirko10b89ee42015-05-12 14:56:09 +020061#include <net/flow_dissector.h>
Avinash Kumar118a7b02013-09-19 21:36:50 +053062#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
Linus Torvalds1da177e2005-04-16 15:20:36 -070064__setup("ether=", netdev_boot_setup);
65
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -070066/**
67 * eth_header - create the Ethernet header
68 * @skb: buffer to alter
69 * @dev: source device
70 * @type: Ethernet type field
71 * @daddr: destination address (NULL leave destination address)
72 * @saddr: source address (NULL use device source address)
73 * @len: packet length (<= skb->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 *
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -070075 *
Octavian Purdilabf9ae532009-12-26 11:50:59 +000076 * Set the protocol type. For a packet of type ETH_P_802_3/2 we put the length
77 * in here instead.
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 */
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -070079int eth_header(struct sk_buff *skb, struct net_device *dev,
80 unsigned short type,
Eric Dumazet95c96172012-04-15 05:58:06 +000081 const void *daddr, const void *saddr, unsigned int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -070082{
Stephen Hemminger2e4ca752006-08-17 18:20:18 -070083 struct ethhdr *eth = (struct ethhdr *)skb_push(skb, ETH_HLEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
Octavian Purdilabf9ae532009-12-26 11:50:59 +000085 if (type != ETH_P_802_3 && type != ETH_P_802_2)
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 eth->h_proto = htons(type);
87 else
88 eth->h_proto = htons(len);
89
90 /*
Stephen Hemminger2e4ca752006-08-17 18:20:18 -070091 * Set the source hardware address.
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
Stephen Hemminger2e4ca752006-08-17 18:20:18 -070094 if (!saddr)
95 saddr = dev->dev_addr;
Stephen Hemminger23f1f4e2007-08-24 22:35:44 -070096 memcpy(eth->h_source, saddr, ETH_ALEN);
Stephen Hemminger2e4ca752006-08-17 18:20:18 -070097
98 if (daddr) {
Stephen Hemminger23f1f4e2007-08-24 22:35:44 -070099 memcpy(eth->h_dest, daddr, ETH_ALEN);
Jamal Hadi Salimf8d0e3f2006-02-23 16:18:01 -0800100 return ETH_HLEN;
101 }
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700102
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 /*
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700104 * Anyway, the loopback-device should never use this function...
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 */
106
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700107 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) {
Joe Perchesafc130d2015-03-02 19:54:56 -0800108 eth_zero_addr(eth->h_dest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 return ETH_HLEN;
110 }
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700111
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 return -ETH_HLEN;
113}
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700114EXPORT_SYMBOL(eth_header);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700116/**
Alexander Duyck56193d12014-09-05 19:20:26 -0400117 * eth_get_headlen - determine the the length of header for an ethernet frame
118 * @data: pointer to start of frame
119 * @len: total length of frame
120 *
121 * Make a best effort attempt to pull the length for all of the headers for
122 * a given frame in a linear buffer.
123 */
124u32 eth_get_headlen(void *data, unsigned int len)
125{
126 const struct ethhdr *eth = (const struct ethhdr *)data;
127 struct flow_keys keys;
128
129 /* this should never happen, but better safe than sorry */
130 if (len < sizeof(*eth))
131 return len;
132
133 /* parse any remaining L2/L3 headers, check for L4 */
Jiri Pirko06635a32015-05-12 14:56:16 +0200134 if (!skb_flow_dissect_flow_keys_buf(&keys, data, eth->h_proto,
135 sizeof(*eth), len))
136 return max_t(u32, keys.basic.thoff, sizeof(*eth));
Alexander Duyck56193d12014-09-05 19:20:26 -0400137
138 /* parse for any L4 headers */
139 return min_t(u32, __skb_get_poff(NULL, data, &keys, len), len);
140}
141EXPORT_SYMBOL(eth_get_headlen);
142
143/**
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700144 * eth_type_trans - determine the packet's protocol ID.
145 * @skb: received socket data
146 * @dev: receiving network device
147 *
148 * The rule here is that we
149 * assume 802.3 if the type field is short enough to be a length.
150 * This is normal practice and works for any 'now in use' protocol.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 */
Alexey Dobriyanab611482005-07-12 12:08:43 -0700152__be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153{
Eric Dumazet0864c152014-01-16 15:03:31 -0800154 unsigned short _service_access_point;
155 const unsigned short *sap;
156 const struct ethhdr *eth;
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700157
Arnaldo Carvalho de Melo4c13eb62007-04-25 17:40:23 -0700158 skb->dev = dev;
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -0700159 skb_reset_mac_header(skb);
Alexander Duyck610986e2015-04-30 14:53:59 -0700160
161 eth = (struct ethhdr *)skb->data;
David S. Miller47d29642010-05-02 02:21:44 -0700162 skb_pull_inline(skb, ETH_HLEN);
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700163
Alexander Duyckd54385c2015-04-30 14:53:54 -0700164 if (unlikely(is_multicast_ether_addr_64bits(eth->h_dest))) {
Joe Perchesa6700db2012-05-09 17:04:04 +0000165 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
David S. Millerba645c12005-09-27 16:03:05 -0700166 skb->pkt_type = PACKET_BROADCAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 else
David S. Millerba645c12005-09-27 16:03:05 -0700168 skb->pkt_type = PACKET_MULTICAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 }
stephen hemminger12861b72013-09-27 17:19:41 -0700170 else if (unlikely(!ether_addr_equal_64bits(eth->h_dest,
171 dev->dev_addr)))
172 skb->pkt_type = PACKET_OTHERHOST;
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700173
Lennert Buytenhekcf85d082008-10-07 13:45:02 +0000174 /*
175 * Some variants of DSA tagging don't have an ethertype field
176 * at all, so we check here whether one of those tagging
177 * variants has been configured on the receiving interface,
178 * and if so, set skb->protocol without looking at the packet.
179 */
Florian Fainelli3e8a72d2014-08-27 17:04:46 -0700180 if (unlikely(netdev_uses_dsa(dev)))
181 return htons(ETH_P_XDSA);
Lennert Buytenhekcf85d082008-10-07 13:45:02 +0000182
Alexander Duyck2c7a88c2015-05-04 14:33:48 -0700183 if (likely(eth_proto_is_802_3(eth->h_proto)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 return eth->h_proto;
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 /*
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700187 * This is a magic hack to spot IPX packets. Older Novell breaks
188 * the protocol design and runs IPX over 802.3 without an 802.2 LLC
189 * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
190 * won't work for fault tolerant netware but does for the rest.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 */
Eric Dumazet0864c152014-01-16 15:03:31 -0800192 sap = skb_header_pointer(skb, 0, sizeof(*sap), &_service_access_point);
193 if (sap && *sap == 0xFFFF)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 return htons(ETH_P_802_3);
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700195
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 /*
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700197 * Real 802.2 LLC
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 */
199 return htons(ETH_P_802_2);
200}
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700201EXPORT_SYMBOL(eth_type_trans);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700203/**
204 * eth_header_parse - extract hardware address from packet
205 * @skb: packet to extract header from
206 * @haddr: destination buffer
207 */
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700208int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209{
Stephen Hemmingerb95cce32007-09-26 22:13:38 -0700210 const struct ethhdr *eth = eth_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 memcpy(haddr, eth->h_source, ETH_ALEN);
212 return ETH_ALEN;
213}
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700214EXPORT_SYMBOL(eth_header_parse);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700216/**
217 * eth_header_cache - fill cache entry from neighbour
218 * @neigh: source neighbour
219 * @hh: destination cache entry
Randy Dunlap48daec02011-07-25 16:17:01 -0700220 * @type: Ethernet type field
Ben Hutchings2c530402012-07-10 10:55:09 +0000221 *
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700222 * Create an Ethernet header template from the neighbour.
223 */
David S. Millere69dd332011-07-12 23:28:12 -0700224int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh, __be16 type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 struct ethhdr *eth;
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700227 const struct net_device *dev = neigh->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700229 eth = (struct ethhdr *)
230 (((u8 *) hh->hh_data) + (HH_DATA_OFF(sizeof(*eth))));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
YOSHIFUJI Hideakif576e242007-03-07 14:19:03 +0900232 if (type == htons(ETH_P_802_3))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 return -1;
234
235 eth->h_proto = type;
Stephen Hemminger23f1f4e2007-08-24 22:35:44 -0700236 memcpy(eth->h_source, dev->dev_addr, ETH_ALEN);
237 memcpy(eth->h_dest, neigh->ha, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 hh->hh_len = ETH_HLEN;
239 return 0;
240}
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700241EXPORT_SYMBOL(eth_header_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700243/**
244 * eth_header_cache_update - update cache entry
245 * @hh: destination cache entry
246 * @dev: network device
247 * @haddr: new hardware address
248 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 * Called by Address Resolution module to notify changes in address.
250 */
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700251void eth_header_cache_update(struct hh_cache *hh,
252 const struct net_device *dev,
253 const unsigned char *haddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254{
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700255 memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)),
Stephen Hemminger23f1f4e2007-08-24 22:35:44 -0700256 haddr, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257}
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700258EXPORT_SYMBOL(eth_header_cache_update);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700260/**
Stefan Hajnoczifa0879e2013-01-21 01:17:22 +0000261 * eth_prepare_mac_addr_change - prepare for mac change
262 * @dev: network device
263 * @p: socket address
264 */
265int eth_prepare_mac_addr_change(struct net_device *dev, void *p)
266{
267 struct sockaddr *addr = p;
268
269 if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
270 return -EBUSY;
271 if (!is_valid_ether_addr(addr->sa_data))
272 return -EADDRNOTAVAIL;
273 return 0;
274}
275EXPORT_SYMBOL(eth_prepare_mac_addr_change);
276
277/**
278 * eth_commit_mac_addr_change - commit mac change
279 * @dev: network device
280 * @p: socket address
281 */
282void eth_commit_mac_addr_change(struct net_device *dev, void *p)
283{
284 struct sockaddr *addr = p;
285
286 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
287}
288EXPORT_SYMBOL(eth_commit_mac_addr_change);
289
290/**
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700291 * eth_mac_addr - set new Ethernet hardware address
292 * @dev: network device
293 * @p: socket address
Ben Hutchings2c530402012-07-10 10:55:09 +0000294 *
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700295 * Change hardware address of device.
296 *
297 * This doesn't change hardware matching, so needs to be overridden
298 * for most real devices.
299 */
Stephen Hemmingerccad6372008-11-19 22:42:31 -0800300int eth_mac_addr(struct net_device *dev, void *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301{
Stefan Hajnoczifa0879e2013-01-21 01:17:22 +0000302 int ret;
Patrick McHardy71bffe52007-07-11 19:41:18 -0700303
Stefan Hajnoczifa0879e2013-01-21 01:17:22 +0000304 ret = eth_prepare_mac_addr_change(dev, p);
305 if (ret < 0)
306 return ret;
307 eth_commit_mac_addr_change(dev, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 return 0;
309}
Stephen Hemmingerccad6372008-11-19 22:42:31 -0800310EXPORT_SYMBOL(eth_mac_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700312/**
313 * eth_change_mtu - set new MTU size
314 * @dev: network device
315 * @new_mtu: new Maximum Transfer Unit
316 *
317 * Allow changing MTU size. Needs to be overridden for devices
318 * supporting jumbo frames.
319 */
Stephen Hemmingerccad6372008-11-19 22:42:31 -0800320int eth_change_mtu(struct net_device *dev, int new_mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321{
Kris Katterjohn46f25df2006-01-05 16:35:42 -0800322 if (new_mtu < 68 || new_mtu > ETH_DATA_LEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 return -EINVAL;
324 dev->mtu = new_mtu;
325 return 0;
326}
Stephen Hemmingerccad6372008-11-19 22:42:31 -0800327EXPORT_SYMBOL(eth_change_mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
Stephen Hemmingerccad6372008-11-19 22:42:31 -0800329int eth_validate_addr(struct net_device *dev)
Jeff Garzikbada3392007-10-23 20:19:37 -0700330{
331 if (!is_valid_ether_addr(dev->dev_addr))
Patrick McHardy2ed99262008-04-13 22:45:40 -0700332 return -EADDRNOTAVAIL;
Jeff Garzikbada3392007-10-23 20:19:37 -0700333
334 return 0;
335}
Stephen Hemmingerccad6372008-11-19 22:42:31 -0800336EXPORT_SYMBOL(eth_validate_addr);
Jeff Garzikbada3392007-10-23 20:19:37 -0700337
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700338const struct header_ops eth_header_ops ____cacheline_aligned = {
339 .create = eth_header,
340 .parse = eth_header_parse,
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700341 .cache = eth_header_cache,
342 .cache_update = eth_header_cache_update,
343};
344
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700345/**
346 * ether_setup - setup Ethernet network device
347 * @dev: network device
Ben Hutchings2c530402012-07-10 10:55:09 +0000348 *
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700349 * Fill in the fields of the device structure with Ethernet-generic values.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 */
351void ether_setup(struct net_device *dev)
352{
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700353 dev->header_ops = &eth_header_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 dev->type = ARPHRD_ETHER;
355 dev->hard_header_len = ETH_HLEN;
Kris Katterjohn46f25df2006-01-05 16:35:42 -0800356 dev->mtu = ETH_DATA_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 dev->addr_len = ETH_ALEN;
YOSHIFUJI Hideaki03d52d72007-02-09 23:24:44 +0900358 dev->tx_queue_len = 1000; /* Ethernet wants good queues */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 dev->flags = IFF_BROADCAST|IFF_MULTICAST;
nhorman31dda0a2011-09-14 03:05:02 +0000360 dev->priv_flags |= IFF_TX_SKB_SHARING;
YOSHIFUJI Hideaki03d52d72007-02-09 23:24:44 +0900361
Joe Perchesafc130d2015-03-02 19:54:56 -0800362 eth_broadcast_addr(dev->broadcast);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363
364}
365EXPORT_SYMBOL(ether_setup);
366
367/**
Tom Herbert36909ea2011-01-09 19:36:31 +0000368 * alloc_etherdev_mqs - Allocates and sets up an Ethernet device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 * @sizeof_priv: Size of additional driver-private structure to be allocated
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700370 * for this Ethernet device
Tom Herbert36909ea2011-01-09 19:36:31 +0000371 * @txqs: The number of TX queues this device has.
Randy Dunlap3806b4f2011-01-12 14:50:51 +0000372 * @rxqs: The number of RX queues this device has.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 *
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700374 * Fill in the fields of the device structure with Ethernet-generic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 * values. Basically does everything except registering the device.
376 *
377 * Constructs a new net device, complete with a private data area of
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700378 * size (sizeof_priv). A 32-byte (not bit) alignment is enforced for
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 * this private data area.
380 */
381
Tom Herbert36909ea2011-01-09 19:36:31 +0000382struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs,
383 unsigned int rxqs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384{
Tom Gundersenc835a672014-07-14 16:37:24 +0200385 return alloc_netdev_mqs(sizeof_priv, "eth%d", NET_NAME_UNKNOWN,
386 ether_setup, txqs, rxqs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387}
Tom Herbert36909ea2011-01-09 19:36:31 +0000388EXPORT_SYMBOL(alloc_etherdev_mqs);
Joe Perches0795af52007-10-03 17:59:30 -0700389
Michael Chan7ffc49a2007-12-24 21:28:09 -0800390ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len)
391{
David S. Millerae8e9c52013-07-16 17:09:15 -0700392 return scnprintf(buf, PAGE_SIZE, "%*phC\n", len, addr);
Michael Chan7ffc49a2007-12-24 21:28:09 -0800393}
394EXPORT_SYMBOL(sysfs_format_mac);
Jesse Gross9b174d82014-12-30 19:10:15 -0800395
396struct sk_buff **eth_gro_receive(struct sk_buff **head,
397 struct sk_buff *skb)
398{
399 struct sk_buff *p, **pp = NULL;
400 struct ethhdr *eh, *eh2;
401 unsigned int hlen, off_eth;
402 const struct packet_offload *ptype;
403 __be16 type;
404 int flush = 1;
405
406 off_eth = skb_gro_offset(skb);
407 hlen = off_eth + sizeof(*eh);
408 eh = skb_gro_header_fast(skb, off_eth);
409 if (skb_gro_header_hard(skb, hlen)) {
410 eh = skb_gro_header_slow(skb, hlen, off_eth);
411 if (unlikely(!eh))
412 goto out;
413 }
414
415 flush = 0;
416
417 for (p = *head; p; p = p->next) {
418 if (!NAPI_GRO_CB(p)->same_flow)
419 continue;
420
421 eh2 = (struct ethhdr *)(p->data + off_eth);
422 if (compare_ether_header(eh, eh2)) {
423 NAPI_GRO_CB(p)->same_flow = 0;
424 continue;
425 }
426 }
427
428 type = eh->h_proto;
429
430 rcu_read_lock();
431 ptype = gro_find_receive_by_type(type);
432 if (ptype == NULL) {
433 flush = 1;
434 goto out_unlock;
435 }
436
437 skb_gro_pull(skb, sizeof(*eh));
438 skb_gro_postpull_rcsum(skb, eh, sizeof(*eh));
439 pp = ptype->callbacks.gro_receive(head, skb);
440
441out_unlock:
442 rcu_read_unlock();
443out:
444 NAPI_GRO_CB(skb)->flush |= flush;
445
446 return pp;
447}
448EXPORT_SYMBOL(eth_gro_receive);
449
450int eth_gro_complete(struct sk_buff *skb, int nhoff)
451{
452 struct ethhdr *eh = (struct ethhdr *)(skb->data + nhoff);
453 __be16 type = eh->h_proto;
454 struct packet_offload *ptype;
455 int err = -ENOSYS;
456
457 if (skb->encapsulation)
458 skb_set_inner_mac_header(skb, nhoff);
459
460 rcu_read_lock();
461 ptype = gro_find_complete_by_type(type);
462 if (ptype != NULL)
463 err = ptype->callbacks.gro_complete(skb, nhoff +
464 sizeof(struct ethhdr));
465
466 rcu_read_unlock();
467 return err;
468}
469EXPORT_SYMBOL(eth_gro_complete);
470
471static struct packet_offload eth_packet_offload __read_mostly = {
472 .type = cpu_to_be16(ETH_P_TEB),
473 .callbacks = {
474 .gro_receive = eth_gro_receive,
475 .gro_complete = eth_gro_complete,
476 },
477};
478
479static int __init eth_offload_init(void)
480{
481 dev_add_offload(&eth_packet_offload);
482
483 return 0;
484}
485
486fs_initcall(eth_offload_init);