Commit | Line | Data |
---|---|---|
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> |
118a7b0e | 61 | #include <linux/uaccess.h> |
1da177e4 | 62 | |
1da177e4 LT |
63 | __setup("ether=", netdev_boot_setup); |
64 | ||
d3e01f71 SH |
65 | /** |
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) | |
1da177e4 | 73 | * |
d3e01f71 | 74 | * |
bf9ae538 OP |
75 | * Set the protocol type. For a packet of type ETH_P_802_3/2 we put the length |
76 | * in here instead. | |
1da177e4 | 77 | */ |
3b04ddde SH |
78 | int eth_header(struct sk_buff *skb, struct net_device *dev, |
79 | unsigned short type, | |
95c96174 | 80 | const void *daddr, const void *saddr, unsigned int len) |
1da177e4 | 81 | { |
2e4ca75b | 82 | struct ethhdr *eth = (struct ethhdr *)skb_push(skb, ETH_HLEN); |
1da177e4 | 83 | |
bf9ae538 | 84 | if (type != ETH_P_802_3 && type != ETH_P_802_2) |
1da177e4 LT |
85 | eth->h_proto = htons(type); |
86 | else | |
87 | eth->h_proto = htons(len); | |
88 | ||
89 | /* | |
2e4ca75b | 90 | * Set the source hardware address. |
1da177e4 | 91 | */ |
2e4ca75b SH |
92 | |
93 | if (!saddr) | |
ff593c59 | 94 | saddr = dev->dev_addr; |
23f1f4ef | 95 | memcpy(eth->h_source, saddr, ETH_ALEN); |
1da177e4 | 96 | |
2e4ca75b | 97 | if (daddr) { |
23f1f4ef | 98 | memcpy(eth->h_dest, daddr, ETH_ALEN); |
f8d0e3f1 JHS |
99 | return ETH_HLEN; |
100 | } | |
2e4ca75b | 101 | |
1da177e4 | 102 | /* |
2e4ca75b | 103 | * Anyway, the loopback-device should never use this function... |
1da177e4 LT |
104 | */ |
105 | ||
2e4ca75b | 106 | if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) { |
23f1f4ef | 107 | memset(eth->h_dest, 0, ETH_ALEN); |
1da177e4 LT |
108 | return ETH_HLEN; |
109 | } | |
2e4ca75b | 110 | |
1da177e4 LT |
111 | return -ETH_HLEN; |
112 | } | |
3b04ddde | 113 | EXPORT_SYMBOL(eth_header); |
1da177e4 | 114 | |
d3e01f71 SH |
115 | /** |
116 | * eth_rebuild_header- rebuild the Ethernet MAC header. | |
117 | * @skb: socket buffer to update | |
118 | * | |
119 | * 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. | |
1da177e4 | 121 | * |
d3e01f71 SH |
122 | * This routine CANNOT use cached dst->neigh! |
123 | * Really, it is used only when dst->neigh is wrong. | |
1da177e4 | 124 | */ |
1da177e4 LT |
125 | int eth_rebuild_header(struct sk_buff *skb) |
126 | { | |
127 | struct ethhdr *eth = (struct ethhdr *)skb->data; | |
128 | struct net_device *dev = skb->dev; | |
129 | ||
2e4ca75b | 130 | switch (eth->h_proto) { |
1da177e4 | 131 | #ifdef CONFIG_INET |
60678040 | 132 | case htons(ETH_P_IP): |
2e4ca75b SH |
133 | return arp_find(eth->h_dest, skb); |
134 | #endif | |
1da177e4 | 135 | default: |
118a7b0e | 136 | netdev_dbg(dev, |
2e4ca75b | 137 | "%s: unable to resolve type %X addresses.\n", |
b002a861 | 138 | dev->name, ntohs(eth->h_proto)); |
2e4ca75b | 139 | |
23f1f4ef | 140 | memcpy(eth->h_source, dev->dev_addr, ETH_ALEN); |
1da177e4 LT |
141 | break; |
142 | } | |
143 | ||
144 | return 0; | |
145 | } | |
3b04ddde | 146 | EXPORT_SYMBOL(eth_rebuild_header); |
1da177e4 | 147 | |
d3e01f71 SH |
148 | /** |
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. | |
1da177e4 | 156 | */ |
ab611487 | 157 | __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 158 | { |
0864c158 ED |
159 | unsigned short _service_access_point; |
160 | const unsigned short *sap; | |
161 | const struct ethhdr *eth; | |
2e4ca75b | 162 | |
4c13eb66 | 163 | skb->dev = dev; |
459a98ed | 164 | skb_reset_mac_header(skb); |
47d29646 | 165 | skb_pull_inline(skb, ETH_HLEN); |
1da177e4 | 166 | eth = eth_hdr(skb); |
2e4ca75b | 167 | |
1f87e235 | 168 | if (unlikely(is_multicast_ether_addr(eth->h_dest))) { |
a6700db1 | 169 | if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) |
ba645c16 | 170 | skb->pkt_type = PACKET_BROADCAST; |
1da177e4 | 171 | else |
ba645c16 | 172 | skb->pkt_type = PACKET_MULTICAST; |
1da177e4 | 173 | } |
12861b7b | 174 | else if (unlikely(!ether_addr_equal_64bits(eth->h_dest, |
175 | dev->dev_addr))) | |
176 | skb->pkt_type = PACKET_OTHERHOST; | |
2e4ca75b | 177 | |
cf85d08f LB |
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 | */ | |
56d7b53f | 184 | if (unlikely(netdev_uses_dsa_tags(dev))) |
cf85d08f | 185 | return htons(ETH_P_DSA); |
56d7b53f | 186 | |
187 | if (unlikely(netdev_uses_trailer_tags(dev))) | |
396138f0 | 188 | return htons(ETH_P_TRAILER); |
cf85d08f | 189 | |
56d7b53f | 190 | if (likely(ntohs(eth->h_proto) >= ETH_P_802_3_MIN)) |
1da177e4 | 191 | return eth->h_proto; |
2e4ca75b | 192 | |
1da177e4 | 193 | /* |
2e4ca75b SH |
194 | * This is a magic hack to spot IPX packets. Older Novell breaks |
195 | * the protocol design and runs IPX over 802.3 without an 802.2 LLC | |
196 | * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This | |
197 | * won't work for fault tolerant netware but does for the rest. | |
1da177e4 | 198 | */ |
0864c158 ED |
199 | sap = skb_header_pointer(skb, 0, sizeof(*sap), &_service_access_point); |
200 | if (sap && *sap == 0xFFFF) | |
1da177e4 | 201 | return htons(ETH_P_802_3); |
2e4ca75b | 202 | |
1da177e4 | 203 | /* |
2e4ca75b | 204 | * Real 802.2 LLC |
1da177e4 LT |
205 | */ |
206 | return htons(ETH_P_802_2); | |
207 | } | |
2e4ca75b | 208 | EXPORT_SYMBOL(eth_type_trans); |
1da177e4 | 209 | |
d3e01f71 SH |
210 | /** |
211 | * eth_header_parse - extract hardware address from packet | |
212 | * @skb: packet to extract header from | |
213 | * @haddr: destination buffer | |
214 | */ | |
3b04ddde | 215 | int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
1da177e4 | 216 | { |
b95cce35 | 217 | const struct ethhdr *eth = eth_hdr(skb); |
1da177e4 LT |
218 | memcpy(haddr, eth->h_source, ETH_ALEN); |
219 | return ETH_ALEN; | |
220 | } | |
3b04ddde | 221 | EXPORT_SYMBOL(eth_header_parse); |
1da177e4 | 222 | |
d3e01f71 SH |
223 | /** |
224 | * eth_header_cache - fill cache entry from neighbour | |
225 | * @neigh: source neighbour | |
226 | * @hh: destination cache entry | |
48daec03 | 227 | * @type: Ethernet type field |
2c53040f | 228 | * |
d3e01f71 SH |
229 | * Create an Ethernet header template from the neighbour. |
230 | */ | |
e69dd336 | 231 | int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh, __be16 type) |
1da177e4 | 232 | { |
1da177e4 | 233 | struct ethhdr *eth; |
3b04ddde | 234 | const struct net_device *dev = neigh->dev; |
1da177e4 | 235 | |
2e4ca75b SH |
236 | eth = (struct ethhdr *) |
237 | (((u8 *) hh->hh_data) + (HH_DATA_OFF(sizeof(*eth)))); | |
1da177e4 | 238 | |
f576e24f | 239 | if (type == htons(ETH_P_802_3)) |
1da177e4 LT |
240 | return -1; |
241 | ||
242 | eth->h_proto = type; | |
23f1f4ef SH |
243 | memcpy(eth->h_source, dev->dev_addr, ETH_ALEN); |
244 | memcpy(eth->h_dest, neigh->ha, ETH_ALEN); | |
1da177e4 LT |
245 | hh->hh_len = ETH_HLEN; |
246 | return 0; | |
247 | } | |
3b04ddde | 248 | EXPORT_SYMBOL(eth_header_cache); |
1da177e4 | 249 | |
d3e01f71 SH |
250 | /** |
251 | * eth_header_cache_update - update cache entry | |
252 | * @hh: destination cache entry | |
253 | * @dev: network device | |
254 | * @haddr: new hardware address | |
255 | * | |
1da177e4 LT |
256 | * Called by Address Resolution module to notify changes in address. |
257 | */ | |
3b04ddde SH |
258 | void eth_header_cache_update(struct hh_cache *hh, |
259 | const struct net_device *dev, | |
260 | const unsigned char *haddr) | |
1da177e4 | 261 | { |
2e4ca75b | 262 | memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)), |
23f1f4ef | 263 | haddr, ETH_ALEN); |
1da177e4 | 264 | } |
3b04ddde | 265 | EXPORT_SYMBOL(eth_header_cache_update); |
1da177e4 | 266 | |
fa0879e3 SH |
267 | /** |
268 | * eth_prepare_mac_addr_change - prepare for mac change | |
269 | * @dev: network device | |
270 | * @p: socket address | |
271 | */ | |
272 | int eth_prepare_mac_addr_change(struct net_device *dev, void *p) | |
273 | { | |
274 | struct sockaddr *addr = p; | |
275 | ||
276 | if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev)) | |
277 | return -EBUSY; | |
278 | if (!is_valid_ether_addr(addr->sa_data)) | |
279 | return -EADDRNOTAVAIL; | |
280 | return 0; | |
281 | } | |
282 | EXPORT_SYMBOL(eth_prepare_mac_addr_change); | |
283 | ||
284 | /** | |
285 | * eth_commit_mac_addr_change - commit mac change | |
286 | * @dev: network device | |
287 | * @p: socket address | |
288 | */ | |
289 | void eth_commit_mac_addr_change(struct net_device *dev, void *p) | |
290 | { | |
291 | struct sockaddr *addr = p; | |
292 | ||
293 | memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); | |
294 | } | |
295 | EXPORT_SYMBOL(eth_commit_mac_addr_change); | |
296 | ||
d3e01f71 SH |
297 | /** |
298 | * eth_mac_addr - set new Ethernet hardware address | |
299 | * @dev: network device | |
300 | * @p: socket address | |
2c53040f | 301 | * |
d3e01f71 SH |
302 | * Change hardware address of device. |
303 | * | |
304 | * This doesn't change hardware matching, so needs to be overridden | |
305 | * for most real devices. | |
306 | */ | |
ccad637b | 307 | int eth_mac_addr(struct net_device *dev, void *p) |
1da177e4 | 308 | { |
fa0879e3 | 309 | int ret; |
71bffe55 | 310 | |
fa0879e3 SH |
311 | ret = eth_prepare_mac_addr_change(dev, p); |
312 | if (ret < 0) | |
313 | return ret; | |
314 | eth_commit_mac_addr_change(dev, p); | |
1da177e4 LT |
315 | return 0; |
316 | } | |
ccad637b | 317 | EXPORT_SYMBOL(eth_mac_addr); |
1da177e4 | 318 | |
d3e01f71 SH |
319 | /** |
320 | * eth_change_mtu - set new MTU size | |
321 | * @dev: network device | |
322 | * @new_mtu: new Maximum Transfer Unit | |
323 | * | |
324 | * Allow changing MTU size. Needs to be overridden for devices | |
325 | * supporting jumbo frames. | |
326 | */ | |
ccad637b | 327 | int eth_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 | 328 | { |
46f25dff | 329 | if (new_mtu < 68 || new_mtu > ETH_DATA_LEN) |
1da177e4 LT |
330 | return -EINVAL; |
331 | dev->mtu = new_mtu; | |
332 | return 0; | |
333 | } | |
ccad637b | 334 | EXPORT_SYMBOL(eth_change_mtu); |
1da177e4 | 335 | |
ccad637b | 336 | int eth_validate_addr(struct net_device *dev) |
bada339b JG |
337 | { |
338 | if (!is_valid_ether_addr(dev->dev_addr)) | |
2ed9926e | 339 | return -EADDRNOTAVAIL; |
bada339b JG |
340 | |
341 | return 0; | |
342 | } | |
ccad637b | 343 | EXPORT_SYMBOL(eth_validate_addr); |
bada339b | 344 | |
3b04ddde SH |
345 | const struct header_ops eth_header_ops ____cacheline_aligned = { |
346 | .create = eth_header, | |
347 | .parse = eth_header_parse, | |
348 | .rebuild = eth_rebuild_header, | |
349 | .cache = eth_header_cache, | |
350 | .cache_update = eth_header_cache_update, | |
351 | }; | |
352 | ||
d3e01f71 SH |
353 | /** |
354 | * ether_setup - setup Ethernet network device | |
355 | * @dev: network device | |
2c53040f | 356 | * |
d3e01f71 | 357 | * Fill in the fields of the device structure with Ethernet-generic values. |
1da177e4 LT |
358 | */ |
359 | void ether_setup(struct net_device *dev) | |
360 | { | |
3b04ddde | 361 | dev->header_ops = ð_header_ops; |
1da177e4 LT |
362 | dev->type = ARPHRD_ETHER; |
363 | dev->hard_header_len = ETH_HLEN; | |
46f25dff | 364 | dev->mtu = ETH_DATA_LEN; |
1da177e4 | 365 | dev->addr_len = ETH_ALEN; |
03d52d7c | 366 | dev->tx_queue_len = 1000; /* Ethernet wants good queues */ |
1da177e4 | 367 | dev->flags = IFF_BROADCAST|IFF_MULTICAST; |
31dda0ae | 368 | dev->priv_flags |= IFF_TX_SKB_SHARING; |
03d52d7c | 369 | |
2e4ca75b | 370 | memset(dev->broadcast, 0xFF, ETH_ALEN); |
1da177e4 LT |
371 | |
372 | } | |
373 | EXPORT_SYMBOL(ether_setup); | |
374 | ||
375 | /** | |
36909ea4 | 376 | * alloc_etherdev_mqs - Allocates and sets up an Ethernet device |
1da177e4 | 377 | * @sizeof_priv: Size of additional driver-private structure to be allocated |
d3e01f71 | 378 | * for this Ethernet device |
36909ea4 | 379 | * @txqs: The number of TX queues this device has. |
3806b4f3 | 380 | * @rxqs: The number of RX queues this device has. |
1da177e4 | 381 | * |
d3e01f71 | 382 | * Fill in the fields of the device structure with Ethernet-generic |
1da177e4 LT |
383 | * values. Basically does everything except registering the device. |
384 | * | |
385 | * Constructs a new net device, complete with a private data area of | |
d3e01f71 | 386 | * size (sizeof_priv). A 32-byte (not bit) alignment is enforced for |
1da177e4 LT |
387 | * this private data area. |
388 | */ | |
389 | ||
36909ea4 TH |
390 | struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs, |
391 | unsigned int rxqs) | |
1da177e4 | 392 | { |
36909ea4 | 393 | return alloc_netdev_mqs(sizeof_priv, "eth%d", ether_setup, txqs, rxqs); |
1da177e4 | 394 | } |
36909ea4 | 395 | EXPORT_SYMBOL(alloc_etherdev_mqs); |
0795af57 | 396 | |
7ffc49a6 MC |
397 | ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len) |
398 | { | |
ae8e9c5a | 399 | return scnprintf(buf, PAGE_SIZE, "%*phC\n", len, addr); |
7ffc49a6 MC |
400 | } |
401 | EXPORT_SYMBOL(sysfs_format_mac); |