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Commit | Line | Data |
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1da177e4 LT |
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 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
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> | |
03d52d7c | 15 | * |
1da177e4 LT |
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. | |
03d52d7c | 22 | * Tegge : Arp bug fixes. |
1da177e4 LT |
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> | |
1da177e4 LT |
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> | |
1da177e4 | 53 | #include <linux/init.h> |
46f25dff | 54 | #include <linux/if_ether.h> |
1da177e4 LT |
55 | #include <net/dst.h> |
56 | #include <net/arp.h> | |
57 | #include <net/sock.h> | |
58 | #include <net/ipv6.h> | |
59 | #include <net/ip.h> | |
cf85d08f | 60 | #include <net/dsa.h> |
1da177e4 LT |
61 | #include <asm/uaccess.h> |
62 | #include <asm/system.h> | |
1da177e4 | 63 | |
1da177e4 LT |
64 | __setup("ether=", netdev_boot_setup); |
65 | ||
d3e01f71 SH |
66 | /** |
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) | |
1da177e4 | 74 | * |
d3e01f71 | 75 | * |
bf9ae538 OP |
76 | * Set the protocol type. For a packet of type ETH_P_802_3/2 we put the length |
77 | * in here instead. | |
1da177e4 | 78 | */ |
3b04ddde SH |
79 | int eth_header(struct sk_buff *skb, struct net_device *dev, |
80 | unsigned short type, | |
81 | const void *daddr, const void *saddr, unsigned len) | |
1da177e4 | 82 | { |
2e4ca75b | 83 | struct ethhdr *eth = (struct ethhdr *)skb_push(skb, ETH_HLEN); |
1da177e4 | 84 | |
bf9ae538 | 85 | if (type != ETH_P_802_3 && type != ETH_P_802_2) |
1da177e4 LT |
86 | eth->h_proto = htons(type); |
87 | else | |
88 | eth->h_proto = htons(len); | |
89 | ||
90 | /* | |
2e4ca75b | 91 | * Set the source hardware address. |
1da177e4 | 92 | */ |
2e4ca75b SH |
93 | |
94 | if (!saddr) | |
ff593c59 | 95 | saddr = dev->dev_addr; |
23f1f4ef | 96 | memcpy(eth->h_source, saddr, ETH_ALEN); |
1da177e4 | 97 | |
2e4ca75b | 98 | if (daddr) { |
23f1f4ef | 99 | memcpy(eth->h_dest, daddr, ETH_ALEN); |
f8d0e3f1 JHS |
100 | return ETH_HLEN; |
101 | } | |
2e4ca75b | 102 | |
1da177e4 | 103 | /* |
2e4ca75b | 104 | * Anyway, the loopback-device should never use this function... |
1da177e4 LT |
105 | */ |
106 | ||
2e4ca75b | 107 | if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) { |
23f1f4ef | 108 | memset(eth->h_dest, 0, ETH_ALEN); |
1da177e4 LT |
109 | return ETH_HLEN; |
110 | } | |
2e4ca75b | 111 | |
1da177e4 LT |
112 | return -ETH_HLEN; |
113 | } | |
3b04ddde | 114 | EXPORT_SYMBOL(eth_header); |
1da177e4 | 115 | |
d3e01f71 SH |
116 | /** |
117 | * eth_rebuild_header- rebuild the Ethernet MAC header. | |
118 | * @skb: socket buffer to update | |
119 | * | |
120 | * This is called after an ARP or IPV6 ndisc it's resolution on this | |
121 | * sk_buff. We now let protocol (ARP) fill in the other fields. | |
1da177e4 | 122 | * |
d3e01f71 SH |
123 | * This routine CANNOT use cached dst->neigh! |
124 | * Really, it is used only when dst->neigh is wrong. | |
1da177e4 | 125 | */ |
1da177e4 LT |
126 | int eth_rebuild_header(struct sk_buff *skb) |
127 | { | |
128 | struct ethhdr *eth = (struct ethhdr *)skb->data; | |
129 | struct net_device *dev = skb->dev; | |
130 | ||
2e4ca75b | 131 | switch (eth->h_proto) { |
1da177e4 | 132 | #ifdef CONFIG_INET |
60678040 | 133 | case htons(ETH_P_IP): |
2e4ca75b SH |
134 | return arp_find(eth->h_dest, skb); |
135 | #endif | |
1da177e4 LT |
136 | default: |
137 | printk(KERN_DEBUG | |
2e4ca75b | 138 | "%s: unable to resolve type %X addresses.\n", |
b002a861 | 139 | dev->name, ntohs(eth->h_proto)); |
2e4ca75b | 140 | |
23f1f4ef | 141 | memcpy(eth->h_source, dev->dev_addr, ETH_ALEN); |
1da177e4 LT |
142 | break; |
143 | } | |
144 | ||
145 | return 0; | |
146 | } | |
3b04ddde | 147 | EXPORT_SYMBOL(eth_rebuild_header); |
1da177e4 | 148 | |
d3e01f71 SH |
149 | /** |
150 | * eth_type_trans - determine the packet's protocol ID. | |
151 | * @skb: received socket data | |
152 | * @dev: receiving network device | |
153 | * | |
154 | * The rule here is that we | |
155 | * assume 802.3 if the type field is short enough to be a length. | |
156 | * This is normal practice and works for any 'now in use' protocol. | |
1da177e4 | 157 | */ |
ab611487 | 158 | __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
159 | { |
160 | struct ethhdr *eth; | |
2e4ca75b | 161 | |
4c13eb66 | 162 | skb->dev = dev; |
459a98ed | 163 | skb_reset_mac_header(skb); |
47d29646 | 164 | skb_pull_inline(skb, ETH_HLEN); |
1da177e4 | 165 | eth = eth_hdr(skb); |
2e4ca75b | 166 | |
1f87e235 ED |
167 | if (unlikely(is_multicast_ether_addr(eth->h_dest))) { |
168 | if (!compare_ether_addr_64bits(eth->h_dest, dev->broadcast)) | |
ba645c16 | 169 | skb->pkt_type = PACKET_BROADCAST; |
1da177e4 | 170 | else |
ba645c16 | 171 | skb->pkt_type = PACKET_MULTICAST; |
1da177e4 | 172 | } |
2e4ca75b | 173 | |
1da177e4 | 174 | /* |
2e4ca75b SH |
175 | * This ALLMULTI check should be redundant by 1.4 |
176 | * so don't forget to remove it. | |
1da177e4 | 177 | * |
2e4ca75b SH |
178 | * Seems, you forgot to remove it. All silly devices |
179 | * seems to set IFF_PROMISC. | |
1da177e4 | 180 | */ |
2e4ca75b SH |
181 | |
182 | else if (1 /*dev->flags&IFF_PROMISC */ ) { | |
1f87e235 | 183 | if (unlikely(compare_ether_addr_64bits(eth->h_dest, dev->dev_addr))) |
ba645c16 | 184 | skb->pkt_type = PACKET_OTHERHOST; |
1da177e4 | 185 | } |
2e4ca75b | 186 | |
cf85d08f LB |
187 | /* |
188 | * Some variants of DSA tagging don't have an ethertype field | |
189 | * at all, so we check here whether one of those tagging | |
190 | * variants has been configured on the receiving interface, | |
191 | * and if so, set skb->protocol without looking at the packet. | |
192 | */ | |
193 | if (netdev_uses_dsa_tags(dev)) | |
194 | return htons(ETH_P_DSA); | |
396138f0 LB |
195 | if (netdev_uses_trailer_tags(dev)) |
196 | return htons(ETH_P_TRAILER); | |
cf85d08f | 197 | |
1da177e4 LT |
198 | if (ntohs(eth->h_proto) >= 1536) |
199 | return eth->h_proto; | |
2e4ca75b | 200 | |
1da177e4 | 201 | /* |
2e4ca75b SH |
202 | * This is a magic hack to spot IPX packets. Older Novell breaks |
203 | * the protocol design and runs IPX over 802.3 without an 802.2 LLC | |
204 | * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This | |
205 | * won't work for fault tolerant netware but does for the rest. | |
1da177e4 | 206 | */ |
d8d1f30b | 207 | if (skb->len >= 2 && *(unsigned short *)(skb->data) == 0xFFFF) |
1da177e4 | 208 | return htons(ETH_P_802_3); |
2e4ca75b | 209 | |
1da177e4 | 210 | /* |
2e4ca75b | 211 | * Real 802.2 LLC |
1da177e4 LT |
212 | */ |
213 | return htons(ETH_P_802_2); | |
214 | } | |
2e4ca75b | 215 | EXPORT_SYMBOL(eth_type_trans); |
1da177e4 | 216 | |
d3e01f71 SH |
217 | /** |
218 | * eth_header_parse - extract hardware address from packet | |
219 | * @skb: packet to extract header from | |
220 | * @haddr: destination buffer | |
221 | */ | |
3b04ddde | 222 | int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
1da177e4 | 223 | { |
b95cce35 | 224 | const struct ethhdr *eth = eth_hdr(skb); |
1da177e4 LT |
225 | memcpy(haddr, eth->h_source, ETH_ALEN); |
226 | return ETH_ALEN; | |
227 | } | |
3b04ddde | 228 | EXPORT_SYMBOL(eth_header_parse); |
1da177e4 | 229 | |
d3e01f71 SH |
230 | /** |
231 | * eth_header_cache - fill cache entry from neighbour | |
232 | * @neigh: source neighbour | |
233 | * @hh: destination cache entry | |
234 | * Create an Ethernet header template from the neighbour. | |
235 | */ | |
3b04ddde | 236 | int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh) |
1da177e4 | 237 | { |
d77072ec | 238 | __be16 type = hh->hh_type; |
1da177e4 | 239 | struct ethhdr *eth; |
3b04ddde | 240 | const struct net_device *dev = neigh->dev; |
1da177e4 | 241 | |
2e4ca75b SH |
242 | eth = (struct ethhdr *) |
243 | (((u8 *) hh->hh_data) + (HH_DATA_OFF(sizeof(*eth)))); | |
1da177e4 | 244 | |
f576e24f | 245 | if (type == htons(ETH_P_802_3)) |
1da177e4 LT |
246 | return -1; |
247 | ||
248 | eth->h_proto = type; | |
23f1f4ef SH |
249 | memcpy(eth->h_source, dev->dev_addr, ETH_ALEN); |
250 | memcpy(eth->h_dest, neigh->ha, ETH_ALEN); | |
1da177e4 LT |
251 | hh->hh_len = ETH_HLEN; |
252 | return 0; | |
253 | } | |
3b04ddde | 254 | EXPORT_SYMBOL(eth_header_cache); |
1da177e4 | 255 | |
d3e01f71 SH |
256 | /** |
257 | * eth_header_cache_update - update cache entry | |
258 | * @hh: destination cache entry | |
259 | * @dev: network device | |
260 | * @haddr: new hardware address | |
261 | * | |
1da177e4 LT |
262 | * Called by Address Resolution module to notify changes in address. |
263 | */ | |
3b04ddde SH |
264 | void eth_header_cache_update(struct hh_cache *hh, |
265 | const struct net_device *dev, | |
266 | const unsigned char *haddr) | |
1da177e4 | 267 | { |
2e4ca75b | 268 | memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)), |
23f1f4ef | 269 | haddr, ETH_ALEN); |
1da177e4 | 270 | } |
3b04ddde | 271 | EXPORT_SYMBOL(eth_header_cache_update); |
1da177e4 | 272 | |
d3e01f71 SH |
273 | /** |
274 | * eth_mac_addr - set new Ethernet hardware address | |
275 | * @dev: network device | |
276 | * @p: socket address | |
277 | * Change hardware address of device. | |
278 | * | |
279 | * This doesn't change hardware matching, so needs to be overridden | |
280 | * for most real devices. | |
281 | */ | |
ccad637b | 282 | int eth_mac_addr(struct net_device *dev, void *p) |
1da177e4 | 283 | { |
2e4ca75b | 284 | struct sockaddr *addr = p; |
71bffe55 | 285 | |
1da177e4 LT |
286 | if (netif_running(dev)) |
287 | return -EBUSY; | |
71bffe55 PM |
288 | if (!is_valid_ether_addr(addr->sa_data)) |
289 | return -EADDRNOTAVAIL; | |
23f1f4ef | 290 | memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); |
1da177e4 LT |
291 | return 0; |
292 | } | |
ccad637b | 293 | EXPORT_SYMBOL(eth_mac_addr); |
1da177e4 | 294 | |
d3e01f71 SH |
295 | /** |
296 | * eth_change_mtu - set new MTU size | |
297 | * @dev: network device | |
298 | * @new_mtu: new Maximum Transfer Unit | |
299 | * | |
300 | * Allow changing MTU size. Needs to be overridden for devices | |
301 | * supporting jumbo frames. | |
302 | */ | |
ccad637b | 303 | int eth_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 | 304 | { |
46f25dff | 305 | if (new_mtu < 68 || new_mtu > ETH_DATA_LEN) |
1da177e4 LT |
306 | return -EINVAL; |
307 | dev->mtu = new_mtu; | |
308 | return 0; | |
309 | } | |
ccad637b | 310 | EXPORT_SYMBOL(eth_change_mtu); |
1da177e4 | 311 | |
ccad637b | 312 | int eth_validate_addr(struct net_device *dev) |
bada339b JG |
313 | { |
314 | if (!is_valid_ether_addr(dev->dev_addr)) | |
2ed9926e | 315 | return -EADDRNOTAVAIL; |
bada339b JG |
316 | |
317 | return 0; | |
318 | } | |
ccad637b | 319 | EXPORT_SYMBOL(eth_validate_addr); |
bada339b | 320 | |
3b04ddde SH |
321 | const struct header_ops eth_header_ops ____cacheline_aligned = { |
322 | .create = eth_header, | |
323 | .parse = eth_header_parse, | |
324 | .rebuild = eth_rebuild_header, | |
325 | .cache = eth_header_cache, | |
326 | .cache_update = eth_header_cache_update, | |
327 | }; | |
328 | ||
d3e01f71 SH |
329 | /** |
330 | * ether_setup - setup Ethernet network device | |
331 | * @dev: network device | |
332 | * Fill in the fields of the device structure with Ethernet-generic values. | |
1da177e4 LT |
333 | */ |
334 | void ether_setup(struct net_device *dev) | |
335 | { | |
3b04ddde | 336 | dev->header_ops = ð_header_ops; |
1da177e4 LT |
337 | dev->type = ARPHRD_ETHER; |
338 | dev->hard_header_len = ETH_HLEN; | |
46f25dff | 339 | dev->mtu = ETH_DATA_LEN; |
1da177e4 | 340 | dev->addr_len = ETH_ALEN; |
03d52d7c | 341 | dev->tx_queue_len = 1000; /* Ethernet wants good queues */ |
1da177e4 | 342 | dev->flags = IFF_BROADCAST|IFF_MULTICAST; |
03d52d7c | 343 | |
2e4ca75b | 344 | memset(dev->broadcast, 0xFF, ETH_ALEN); |
1da177e4 LT |
345 | |
346 | } | |
347 | EXPORT_SYMBOL(ether_setup); | |
348 | ||
349 | /** | |
f25f4e44 | 350 | * alloc_etherdev_mq - Allocates and sets up an Ethernet device |
1da177e4 | 351 | * @sizeof_priv: Size of additional driver-private structure to be allocated |
d3e01f71 | 352 | * for this Ethernet device |
f25f4e44 | 353 | * @queue_count: The number of queues this device has. |
1da177e4 | 354 | * |
d3e01f71 | 355 | * Fill in the fields of the device structure with Ethernet-generic |
1da177e4 LT |
356 | * values. Basically does everything except registering the device. |
357 | * | |
358 | * Constructs a new net device, complete with a private data area of | |
d3e01f71 | 359 | * size (sizeof_priv). A 32-byte (not bit) alignment is enforced for |
1da177e4 LT |
360 | * this private data area. |
361 | */ | |
362 | ||
f25f4e44 | 363 | struct net_device *alloc_etherdev_mq(int sizeof_priv, unsigned int queue_count) |
1da177e4 | 364 | { |
f25f4e44 | 365 | return alloc_netdev_mq(sizeof_priv, "eth%d", ether_setup, queue_count); |
1da177e4 | 366 | } |
f25f4e44 | 367 | EXPORT_SYMBOL(alloc_etherdev_mq); |
0795af57 | 368 | |
7ffc49a6 | 369 | static size_t _format_mac_addr(char *buf, int buflen, |
53f91dc1 | 370 | const unsigned char *addr, int len) |
0795af57 | 371 | { |
7ffc49a6 MC |
372 | int i; |
373 | char *cp = buf; | |
374 | ||
375 | for (i = 0; i < len; i++) { | |
376 | cp += scnprintf(cp, buflen - (cp - buf), "%02x", addr[i]); | |
377 | if (i == len - 1) | |
378 | break; | |
53f91dc1 | 379 | cp += scnprintf(cp, buflen - (cp - buf), ":"); |
7ffc49a6 MC |
380 | } |
381 | return cp - buf; | |
382 | } | |
383 | ||
384 | ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len) | |
385 | { | |
386 | size_t l; | |
387 | ||
388 | l = _format_mac_addr(buf, PAGE_SIZE, addr, len); | |
53f91dc1 | 389 | l += scnprintf(buf + l, PAGE_SIZE - l, "\n"); |
a02cec21 | 390 | return (ssize_t)l; |
7ffc49a6 MC |
391 | } |
392 | EXPORT_SYMBOL(sysfs_format_mac); |