blob: 33a140e1583449bcf2816bb91792e810f7c1734f [file] [log] [blame]
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>
Avinash Kumar118a7b02013-09-19 21:36:50 +053061#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Linus Torvalds1da177e2005-04-16 15:20:36 -070063__setup("ether=", netdev_boot_setup);
64
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -070065/**
66 * eth_header - create the Ethernet header
67 * @skb: buffer to alter
68 * @dev: source device
69 * @type: Ethernet type field
70 * @daddr: destination address (NULL leave destination address)
71 * @saddr: source address (NULL use device source address)
72 * @len: packet length (<= skb->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 *
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -070074 *
Octavian Purdilabf9ae532009-12-26 11:50:59 +000075 * Set the protocol type. For a packet of type ETH_P_802_3/2 we put the length
76 * in here instead.
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 */
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -070078int eth_header(struct sk_buff *skb, struct net_device *dev,
79 unsigned short type,
Eric Dumazet95c96172012-04-15 05:58:06 +000080 const void *daddr, const void *saddr, unsigned int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -070081{
Stephen Hemminger2e4ca752006-08-17 18:20:18 -070082 struct ethhdr *eth = (struct ethhdr *)skb_push(skb, ETH_HLEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
Octavian Purdilabf9ae532009-12-26 11:50:59 +000084 if (type != ETH_P_802_3 && type != ETH_P_802_2)
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 eth->h_proto = htons(type);
86 else
87 eth->h_proto = htons(len);
88
89 /*
Stephen Hemminger2e4ca752006-08-17 18:20:18 -070090 * Set the source hardware address.
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Stephen Hemminger2e4ca752006-08-17 18:20:18 -070093 if (!saddr)
94 saddr = dev->dev_addr;
Stephen Hemminger23f1f4e2007-08-24 22:35:44 -070095 memcpy(eth->h_source, saddr, ETH_ALEN);
Stephen Hemminger2e4ca752006-08-17 18:20:18 -070096
97 if (daddr) {
Stephen Hemminger23f1f4e2007-08-24 22:35:44 -070098 memcpy(eth->h_dest, daddr, ETH_ALEN);
Jamal Hadi Salimf8d0e3f2006-02-23 16:18:01 -080099 return ETH_HLEN;
100 }
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700101
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 /*
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700103 * Anyway, the loopback-device should never use this function...
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 */
105
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700106 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) {
Stephen Hemminger23f1f4e2007-08-24 22:35:44 -0700107 memset(eth->h_dest, 0, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 return ETH_HLEN;
109 }
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700110
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 return -ETH_HLEN;
112}
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700113EXPORT_SYMBOL(eth_header);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700115/**
116 * eth_rebuild_header- rebuild the Ethernet MAC header.
117 * @skb: socket buffer to update
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 *
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700119 * This is called after an ARP or IPV6 ndisc it's resolution on this
120 * sk_buff. We now let protocol (ARP) fill in the other fields.
121 *
122 * This routine CANNOT use cached dst->neigh!
123 * Really, it is used only when dst->neigh is wrong.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125int eth_rebuild_header(struct sk_buff *skb)
126{
127 struct ethhdr *eth = (struct ethhdr *)skb->data;
128 struct net_device *dev = skb->dev;
129
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700130 switch (eth->h_proto) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131#ifdef CONFIG_INET
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -0700132 case htons(ETH_P_IP):
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700133 return arp_find(eth->h_dest, skb);
134#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 default:
Avinash Kumar118a7b02013-09-19 21:36:50 +0530136 netdev_dbg(dev,
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700137 "%s: unable to resolve type %X addresses.\n",
Johannes Bergb002a862010-04-20 21:06:07 +0000138 dev->name, ntohs(eth->h_proto));
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700139
Stephen Hemminger23f1f4e2007-08-24 22:35:44 -0700140 memcpy(eth->h_source, dev->dev_addr, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 break;
142 }
143
144 return 0;
145}
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700146EXPORT_SYMBOL(eth_rebuild_header);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700148/**
Alexander Duyck56193d12014-09-05 19:20:26 -0400149 * eth_get_headlen - determine the the length of header for an ethernet frame
150 * @data: pointer to start of frame
151 * @len: total length of frame
152 *
153 * Make a best effort attempt to pull the length for all of the headers for
154 * a given frame in a linear buffer.
155 */
156u32 eth_get_headlen(void *data, unsigned int len)
157{
158 const struct ethhdr *eth = (const struct ethhdr *)data;
159 struct flow_keys keys;
160
161 /* this should never happen, but better safe than sorry */
162 if (len < sizeof(*eth))
163 return len;
164
165 /* parse any remaining L2/L3 headers, check for L4 */
166 if (!__skb_flow_dissect(NULL, &keys, data,
167 eth->h_proto, sizeof(*eth), len))
168 return max_t(u32, keys.thoff, sizeof(*eth));
169
170 /* parse for any L4 headers */
171 return min_t(u32, __skb_get_poff(NULL, data, &keys, len), len);
172}
173EXPORT_SYMBOL(eth_get_headlen);
174
175/**
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700176 * eth_type_trans - determine the packet's protocol ID.
177 * @skb: received socket data
178 * @dev: receiving network device
179 *
180 * The rule here is that we
181 * assume 802.3 if the type field is short enough to be a length.
182 * This is normal practice and works for any 'now in use' protocol.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 */
Alexey Dobriyanab611482005-07-12 12:08:43 -0700184__be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185{
Eric Dumazet0864c152014-01-16 15:03:31 -0800186 unsigned short _service_access_point;
187 const unsigned short *sap;
188 const struct ethhdr *eth;
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700189
Arnaldo Carvalho de Melo4c13eb62007-04-25 17:40:23 -0700190 skb->dev = dev;
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -0700191 skb_reset_mac_header(skb);
David S. Miller47d29642010-05-02 02:21:44 -0700192 skb_pull_inline(skb, ETH_HLEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 eth = eth_hdr(skb);
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700194
Eric Dumazet1f87e232008-11-23 23:24:32 -0800195 if (unlikely(is_multicast_ether_addr(eth->h_dest))) {
Joe Perchesa6700db2012-05-09 17:04:04 +0000196 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
David S. Millerba645c12005-09-27 16:03:05 -0700197 skb->pkt_type = PACKET_BROADCAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 else
David S. Millerba645c12005-09-27 16:03:05 -0700199 skb->pkt_type = PACKET_MULTICAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 }
stephen hemminger12861b72013-09-27 17:19:41 -0700201 else if (unlikely(!ether_addr_equal_64bits(eth->h_dest,
202 dev->dev_addr)))
203 skb->pkt_type = PACKET_OTHERHOST;
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700204
Lennert Buytenhekcf85d082008-10-07 13:45:02 +0000205 /*
206 * Some variants of DSA tagging don't have an ethertype field
207 * at all, so we check here whether one of those tagging
208 * variants has been configured on the receiving interface,
209 * and if so, set skb->protocol without looking at the packet.
210 */
Florian Fainelli3e8a72d2014-08-27 17:04:46 -0700211 if (unlikely(netdev_uses_dsa(dev)))
212 return htons(ETH_P_XDSA);
Lennert Buytenhekcf85d082008-10-07 13:45:02 +0000213
stephen hemminger56d7b532013-09-27 17:21:27 -0700214 if (likely(ntohs(eth->h_proto) >= ETH_P_802_3_MIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 return eth->h_proto;
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700216
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 /*
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700218 * This is a magic hack to spot IPX packets. Older Novell breaks
219 * the protocol design and runs IPX over 802.3 without an 802.2 LLC
220 * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
221 * won't work for fault tolerant netware but does for the rest.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 */
Eric Dumazet0864c152014-01-16 15:03:31 -0800223 sap = skb_header_pointer(skb, 0, sizeof(*sap), &_service_access_point);
224 if (sap && *sap == 0xFFFF)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 return htons(ETH_P_802_3);
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700226
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 /*
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700228 * Real 802.2 LLC
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 */
230 return htons(ETH_P_802_2);
231}
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700232EXPORT_SYMBOL(eth_type_trans);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700234/**
235 * eth_header_parse - extract hardware address from packet
236 * @skb: packet to extract header from
237 * @haddr: destination buffer
238 */
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700239int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240{
Stephen Hemmingerb95cce32007-09-26 22:13:38 -0700241 const struct ethhdr *eth = eth_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 memcpy(haddr, eth->h_source, ETH_ALEN);
243 return ETH_ALEN;
244}
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700245EXPORT_SYMBOL(eth_header_parse);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700247/**
248 * eth_header_cache - fill cache entry from neighbour
249 * @neigh: source neighbour
250 * @hh: destination cache entry
Randy Dunlap48daec02011-07-25 16:17:01 -0700251 * @type: Ethernet type field
Ben Hutchings2c530402012-07-10 10:55:09 +0000252 *
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700253 * Create an Ethernet header template from the neighbour.
254 */
David S. Millere69dd332011-07-12 23:28:12 -0700255int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh, __be16 type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 struct ethhdr *eth;
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700258 const struct net_device *dev = neigh->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700260 eth = (struct ethhdr *)
261 (((u8 *) hh->hh_data) + (HH_DATA_OFF(sizeof(*eth))));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
YOSHIFUJI Hideakif576e242007-03-07 14:19:03 +0900263 if (type == htons(ETH_P_802_3))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 return -1;
265
266 eth->h_proto = type;
Stephen Hemminger23f1f4e2007-08-24 22:35:44 -0700267 memcpy(eth->h_source, dev->dev_addr, ETH_ALEN);
268 memcpy(eth->h_dest, neigh->ha, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 hh->hh_len = ETH_HLEN;
270 return 0;
271}
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700272EXPORT_SYMBOL(eth_header_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700274/**
275 * eth_header_cache_update - update cache entry
276 * @hh: destination cache entry
277 * @dev: network device
278 * @haddr: new hardware address
279 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 * Called by Address Resolution module to notify changes in address.
281 */
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700282void eth_header_cache_update(struct hh_cache *hh,
283 const struct net_device *dev,
284 const unsigned char *haddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285{
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700286 memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)),
Stephen Hemminger23f1f4e2007-08-24 22:35:44 -0700287 haddr, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288}
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700289EXPORT_SYMBOL(eth_header_cache_update);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700291/**
Stefan Hajnoczifa0879e2013-01-21 01:17:22 +0000292 * eth_prepare_mac_addr_change - prepare for mac change
293 * @dev: network device
294 * @p: socket address
295 */
296int eth_prepare_mac_addr_change(struct net_device *dev, void *p)
297{
298 struct sockaddr *addr = p;
299
300 if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
301 return -EBUSY;
302 if (!is_valid_ether_addr(addr->sa_data))
303 return -EADDRNOTAVAIL;
304 return 0;
305}
306EXPORT_SYMBOL(eth_prepare_mac_addr_change);
307
308/**
309 * eth_commit_mac_addr_change - commit mac change
310 * @dev: network device
311 * @p: socket address
312 */
313void eth_commit_mac_addr_change(struct net_device *dev, void *p)
314{
315 struct sockaddr *addr = p;
316
317 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
318}
319EXPORT_SYMBOL(eth_commit_mac_addr_change);
320
321/**
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700322 * eth_mac_addr - set new Ethernet hardware address
323 * @dev: network device
324 * @p: socket address
Ben Hutchings2c530402012-07-10 10:55:09 +0000325 *
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700326 * Change hardware address of device.
327 *
328 * This doesn't change hardware matching, so needs to be overridden
329 * for most real devices.
330 */
Stephen Hemmingerccad6372008-11-19 22:42:31 -0800331int eth_mac_addr(struct net_device *dev, void *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332{
Stefan Hajnoczifa0879e2013-01-21 01:17:22 +0000333 int ret;
Patrick McHardy71bffe52007-07-11 19:41:18 -0700334
Stefan Hajnoczifa0879e2013-01-21 01:17:22 +0000335 ret = eth_prepare_mac_addr_change(dev, p);
336 if (ret < 0)
337 return ret;
338 eth_commit_mac_addr_change(dev, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 return 0;
340}
Stephen Hemmingerccad6372008-11-19 22:42:31 -0800341EXPORT_SYMBOL(eth_mac_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700343/**
344 * eth_change_mtu - set new MTU size
345 * @dev: network device
346 * @new_mtu: new Maximum Transfer Unit
347 *
348 * Allow changing MTU size. Needs to be overridden for devices
349 * supporting jumbo frames.
350 */
Stephen Hemmingerccad6372008-11-19 22:42:31 -0800351int eth_change_mtu(struct net_device *dev, int new_mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352{
Kris Katterjohn46f25df2006-01-05 16:35:42 -0800353 if (new_mtu < 68 || new_mtu > ETH_DATA_LEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 return -EINVAL;
355 dev->mtu = new_mtu;
356 return 0;
357}
Stephen Hemmingerccad6372008-11-19 22:42:31 -0800358EXPORT_SYMBOL(eth_change_mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359
Stephen Hemmingerccad6372008-11-19 22:42:31 -0800360int eth_validate_addr(struct net_device *dev)
Jeff Garzikbada3392007-10-23 20:19:37 -0700361{
362 if (!is_valid_ether_addr(dev->dev_addr))
Patrick McHardy2ed99262008-04-13 22:45:40 -0700363 return -EADDRNOTAVAIL;
Jeff Garzikbada3392007-10-23 20:19:37 -0700364
365 return 0;
366}
Stephen Hemmingerccad6372008-11-19 22:42:31 -0800367EXPORT_SYMBOL(eth_validate_addr);
Jeff Garzikbada3392007-10-23 20:19:37 -0700368
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700369const struct header_ops eth_header_ops ____cacheline_aligned = {
370 .create = eth_header,
371 .parse = eth_header_parse,
372 .rebuild = eth_rebuild_header,
373 .cache = eth_header_cache,
374 .cache_update = eth_header_cache_update,
375};
376
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700377/**
378 * ether_setup - setup Ethernet network device
379 * @dev: network device
Ben Hutchings2c530402012-07-10 10:55:09 +0000380 *
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700381 * Fill in the fields of the device structure with Ethernet-generic values.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 */
383void ether_setup(struct net_device *dev)
384{
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700385 dev->header_ops = &eth_header_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 dev->type = ARPHRD_ETHER;
387 dev->hard_header_len = ETH_HLEN;
Kris Katterjohn46f25df2006-01-05 16:35:42 -0800388 dev->mtu = ETH_DATA_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 dev->addr_len = ETH_ALEN;
YOSHIFUJI Hideaki03d52d72007-02-09 23:24:44 +0900390 dev->tx_queue_len = 1000; /* Ethernet wants good queues */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 dev->flags = IFF_BROADCAST|IFF_MULTICAST;
nhorman31dda0a2011-09-14 03:05:02 +0000392 dev->priv_flags |= IFF_TX_SKB_SHARING;
YOSHIFUJI Hideaki03d52d72007-02-09 23:24:44 +0900393
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700394 memset(dev->broadcast, 0xFF, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395
396}
397EXPORT_SYMBOL(ether_setup);
398
399/**
Tom Herbert36909ea2011-01-09 19:36:31 +0000400 * alloc_etherdev_mqs - Allocates and sets up an Ethernet device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 * @sizeof_priv: Size of additional driver-private structure to be allocated
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700402 * for this Ethernet device
Tom Herbert36909ea2011-01-09 19:36:31 +0000403 * @txqs: The number of TX queues this device has.
Randy Dunlap3806b4f2011-01-12 14:50:51 +0000404 * @rxqs: The number of RX queues this device has.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 *
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700406 * Fill in the fields of the device structure with Ethernet-generic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 * values. Basically does everything except registering the device.
408 *
409 * Constructs a new net device, complete with a private data area of
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700410 * size (sizeof_priv). A 32-byte (not bit) alignment is enforced for
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 * this private data area.
412 */
413
Tom Herbert36909ea2011-01-09 19:36:31 +0000414struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs,
415 unsigned int rxqs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416{
Tom Gundersenc835a672014-07-14 16:37:24 +0200417 return alloc_netdev_mqs(sizeof_priv, "eth%d", NET_NAME_UNKNOWN,
418 ether_setup, txqs, rxqs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419}
Tom Herbert36909ea2011-01-09 19:36:31 +0000420EXPORT_SYMBOL(alloc_etherdev_mqs);
Joe Perches0795af52007-10-03 17:59:30 -0700421
Michael Chan7ffc49a2007-12-24 21:28:09 -0800422ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len)
423{
David S. Millerae8e9c52013-07-16 17:09:15 -0700424 return scnprintf(buf, PAGE_SIZE, "%*phC\n", len, addr);
Michael Chan7ffc49a2007-12-24 21:28:09 -0800425}
426EXPORT_SYMBOL(sysfs_format_mac);