blob: a7b417523e9b1181597c340d9305a57dd4c9d431 [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>
60#include <asm/uaccess.h>
61#include <asm/system.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 *
75 * Set the protocol type. For a packet of type ETH_P_802_3 we put the length
76 * in here instead. It is up to the 802.2 layer to carry protocol information.
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,
80 const void *daddr, const void *saddr, unsigned 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
Stephen Hemminger2e4ca752006-08-17 18:20:18 -070084 if (type != ETH_P_802_3)
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
132 case __constant_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:
136 printk(KERN_DEBUG
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700137 "%s: unable to resolve type %X addresses.\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 dev->name, (int)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/**
149 * eth_type_trans - determine the packet's protocol ID.
150 * @skb: received socket data
151 * @dev: receiving network device
152 *
153 * The rule here is that we
154 * assume 802.3 if the type field is short enough to be a length.
155 * This is normal practice and works for any 'now in use' protocol.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 */
Alexey Dobriyanab611482005-07-12 12:08:43 -0700157__be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158{
159 struct ethhdr *eth;
160 unsigned char *rawp;
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700161
Arnaldo Carvalho de Melo4c13eb62007-04-25 17:40:23 -0700162 skb->dev = dev;
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -0700163 skb_reset_mac_header(skb);
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700164 skb_pull(skb, ETH_HLEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 eth = eth_hdr(skb);
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700166
Kris Katterjohndbbc0982006-01-06 13:05:58 -0800167 if (is_multicast_ether_addr(eth->h_dest)) {
Stephen Hemminger360ac8e2005-10-25 15:03:41 -0700168 if (!compare_ether_addr(eth->h_dest, dev->broadcast))
David S. Millerba645c12005-09-27 16:03:05 -0700169 skb->pkt_type = PACKET_BROADCAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 else
David S. Millerba645c12005-09-27 16:03:05 -0700171 skb->pkt_type = PACKET_MULTICAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 }
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700173
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 /*
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700175 * This ALLMULTI check should be redundant by 1.4
176 * so don't forget to remove it.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 *
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700178 * Seems, you forgot to remove it. All silly devices
179 * seems to set IFF_PROMISC.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 */
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700181
182 else if (1 /*dev->flags&IFF_PROMISC */ ) {
Stephen Hemminger360ac8e2005-10-25 15:03:41 -0700183 if (unlikely(compare_ether_addr(eth->h_dest, dev->dev_addr)))
David S. Millerba645c12005-09-27 16:03:05 -0700184 skb->pkt_type = PACKET_OTHERHOST;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 }
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700186
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 if (ntohs(eth->h_proto) >= 1536)
188 return eth->h_proto;
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 rawp = skb->data;
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700191
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 /*
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700193 * This is a magic hack to spot IPX packets. Older Novell breaks
194 * the protocol design and runs IPX over 802.3 without an 802.2 LLC
195 * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
196 * won't work for fault tolerant netware but does for the rest.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 */
198 if (*(unsigned short *)rawp == 0xFFFF)
199 return htons(ETH_P_802_3);
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700200
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 /*
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700202 * Real 802.2 LLC
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 */
204 return htons(ETH_P_802_2);
205}
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700206EXPORT_SYMBOL(eth_type_trans);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700208/**
209 * eth_header_parse - extract hardware address from packet
210 * @skb: packet to extract header from
211 * @haddr: destination buffer
212 */
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700213int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214{
Stephen Hemmingerb95cce32007-09-26 22:13:38 -0700215 const struct ethhdr *eth = eth_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 memcpy(haddr, eth->h_source, ETH_ALEN);
217 return ETH_ALEN;
218}
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700219EXPORT_SYMBOL(eth_header_parse);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700221/**
222 * eth_header_cache - fill cache entry from neighbour
223 * @neigh: source neighbour
224 * @hh: destination cache entry
225 * Create an Ethernet header template from the neighbour.
226 */
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700227int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228{
Al Virod77072e2006-09-28 14:20:34 -0700229 __be16 type = hh->hh_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 struct ethhdr *eth;
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700231 const struct net_device *dev = neigh->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700233 eth = (struct ethhdr *)
234 (((u8 *) hh->hh_data) + (HH_DATA_OFF(sizeof(*eth))));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
YOSHIFUJI Hideakif576e242007-03-07 14:19:03 +0900236 if (type == htons(ETH_P_802_3))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 return -1;
238
239 eth->h_proto = type;
Stephen Hemminger23f1f4e2007-08-24 22:35:44 -0700240 memcpy(eth->h_source, dev->dev_addr, ETH_ALEN);
241 memcpy(eth->h_dest, neigh->ha, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 hh->hh_len = ETH_HLEN;
243 return 0;
244}
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700245EXPORT_SYMBOL(eth_header_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700247/**
248 * eth_header_cache_update - update cache entry
249 * @hh: destination cache entry
250 * @dev: network device
251 * @haddr: new hardware address
252 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 * Called by Address Resolution module to notify changes in address.
254 */
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700255void eth_header_cache_update(struct hh_cache *hh,
256 const struct net_device *dev,
257 const unsigned char *haddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258{
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700259 memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)),
Stephen Hemminger23f1f4e2007-08-24 22:35:44 -0700260 haddr, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261}
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700262EXPORT_SYMBOL(eth_header_cache_update);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700264/**
265 * eth_mac_addr - set new Ethernet hardware address
266 * @dev: network device
267 * @p: socket address
268 * Change hardware address of device.
269 *
270 * This doesn't change hardware matching, so needs to be overridden
271 * for most real devices.
272 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273static int eth_mac_addr(struct net_device *dev, void *p)
274{
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700275 struct sockaddr *addr = p;
Patrick McHardy71bffe52007-07-11 19:41:18 -0700276
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 if (netif_running(dev))
278 return -EBUSY;
Patrick McHardy71bffe52007-07-11 19:41:18 -0700279 if (!is_valid_ether_addr(addr->sa_data))
280 return -EADDRNOTAVAIL;
Stephen Hemminger23f1f4e2007-08-24 22:35:44 -0700281 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 return 0;
283}
284
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700285/**
286 * eth_change_mtu - set new MTU size
287 * @dev: network device
288 * @new_mtu: new Maximum Transfer Unit
289 *
290 * Allow changing MTU size. Needs to be overridden for devices
291 * supporting jumbo frames.
292 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293static int eth_change_mtu(struct net_device *dev, int new_mtu)
294{
Kris Katterjohn46f25df2006-01-05 16:35:42 -0800295 if (new_mtu < 68 || new_mtu > ETH_DATA_LEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 return -EINVAL;
297 dev->mtu = new_mtu;
298 return 0;
299}
300
Jeff Garzikbada3392007-10-23 20:19:37 -0700301static int eth_validate_addr(struct net_device *dev)
302{
303 if (!is_valid_ether_addr(dev->dev_addr))
304 return -EINVAL;
305
306 return 0;
307}
308
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700309const struct header_ops eth_header_ops ____cacheline_aligned = {
310 .create = eth_header,
311 .parse = eth_header_parse,
312 .rebuild = eth_rebuild_header,
313 .cache = eth_header_cache,
314 .cache_update = eth_header_cache_update,
315};
316
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700317/**
318 * ether_setup - setup Ethernet network device
319 * @dev: network device
320 * Fill in the fields of the device structure with Ethernet-generic values.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 */
322void ether_setup(struct net_device *dev)
323{
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700324 dev->header_ops = &eth_header_ops;
325
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 dev->change_mtu = eth_change_mtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 dev->set_mac_address = eth_mac_addr;
Jeff Garzikbada3392007-10-23 20:19:37 -0700328 dev->validate_addr = eth_validate_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
330 dev->type = ARPHRD_ETHER;
331 dev->hard_header_len = ETH_HLEN;
Kris Katterjohn46f25df2006-01-05 16:35:42 -0800332 dev->mtu = ETH_DATA_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 dev->addr_len = ETH_ALEN;
YOSHIFUJI Hideaki03d52d72007-02-09 23:24:44 +0900334 dev->tx_queue_len = 1000; /* Ethernet wants good queues */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 dev->flags = IFF_BROADCAST|IFF_MULTICAST;
YOSHIFUJI Hideaki03d52d72007-02-09 23:24:44 +0900336
Stephen Hemminger2e4ca752006-08-17 18:20:18 -0700337 memset(dev->broadcast, 0xFF, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
339}
340EXPORT_SYMBOL(ether_setup);
341
342/**
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -0700343 * alloc_etherdev_mq - Allocates and sets up an Ethernet device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 * @sizeof_priv: Size of additional driver-private structure to be allocated
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700345 * for this Ethernet device
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -0700346 * @queue_count: The number of queues this device has.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 *
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700348 * Fill in the fields of the device structure with Ethernet-generic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 * values. Basically does everything except registering the device.
350 *
351 * Constructs a new net device, complete with a private data area of
Stephen Hemmingerd3e01f72006-08-17 18:18:53 -0700352 * size (sizeof_priv). A 32-byte (not bit) alignment is enforced for
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 * this private data area.
354 */
355
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -0700356struct net_device *alloc_etherdev_mq(int sizeof_priv, unsigned int queue_count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357{
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -0700358 return alloc_netdev_mq(sizeof_priv, "eth%d", ether_setup, queue_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359}
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -0700360EXPORT_SYMBOL(alloc_etherdev_mq);
Joe Perches0795af52007-10-03 17:59:30 -0700361
Michael Chan7ffc49a2007-12-24 21:28:09 -0800362static size_t _format_mac_addr(char *buf, int buflen,
363 const unsigned char *addr, int len)
Joe Perches0795af52007-10-03 17:59:30 -0700364{
Michael Chan7ffc49a2007-12-24 21:28:09 -0800365 int i;
366 char *cp = buf;
367
368 for (i = 0; i < len; i++) {
369 cp += scnprintf(cp, buflen - (cp - buf), "%02x", addr[i]);
370 if (i == len - 1)
371 break;
372 cp += strlcpy(cp, ":", buflen - (cp - buf));
373 }
374 return cp - buf;
375}
376
377ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len)
378{
379 size_t l;
380
381 l = _format_mac_addr(buf, PAGE_SIZE, addr, len);
382 l += strlcpy(buf + l, "\n", PAGE_SIZE - l);
383 return ((ssize_t) l);
384}
385EXPORT_SYMBOL(sysfs_format_mac);
386
387char *print_mac(char *buf, const unsigned char *addr)
388{
389 _format_mac_addr(buf, MAC_BUF_SIZE, addr, ETH_ALEN);
Joe Perches0795af52007-10-03 17:59:30 -0700390 return buf;
391}
392EXPORT_SYMBOL(print_mac);