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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 | * |
10 | * Authors: Ross Biro |
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> |
15 | * |
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. |
22 | * Tegge : Arp bug fixes. |
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> |
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> |
53 | #include <linux/init.h> |
54 | #include <linux/if_ether.h> |
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> |
60 | #include <net/dsa.h> |
61 | #include <asm/uaccess.h> |
62 | #include <asm/system.h> |
63 | |
64 | __setup("ether=", netdev_boot_setup); |
65 | |
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) |
74 | * |
75 | * |
76 | * Set the protocol type. For a packet of type ETH_P_802_3/2 we put the length |
77 | * in here instead. |
78 | */ |
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) |
82 | { |
83 | struct ethhdr *eth = (struct ethhdr *)skb_push(skb, ETH_HLEN); |
84 | |
85 | if (type != ETH_P_802_3 && type != ETH_P_802_2) |
86 | eth->h_proto = htons(type); |
87 | else |
88 | eth->h_proto = htons(len); |
89 | |
90 | /* |
91 | * Set the source hardware address. |
92 | */ |
93 | |
94 | if (!saddr) |
95 | saddr = dev->dev_addr; |
96 | memcpy(eth->h_source, saddr, ETH_ALEN); |
97 | |
98 | if (daddr) { |
99 | memcpy(eth->h_dest, daddr, ETH_ALEN); |
100 | return ETH_HLEN; |
101 | } |
102 | |
103 | /* |
104 | * Anyway, the loopback-device should never use this function... |
105 | */ |
106 | |
107 | if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) { |
108 | memset(eth->h_dest, 0, ETH_ALEN); |
109 | return ETH_HLEN; |
110 | } |
111 | |
112 | return -ETH_HLEN; |
113 | } |
114 | EXPORT_SYMBOL(eth_header); |
115 | |
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. |
122 | * |
123 | * This routine CANNOT use cached dst->neigh! |
124 | * Really, it is used only when dst->neigh is wrong. |
125 | */ |
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 | |
131 | switch (eth->h_proto) { |
132 | #ifdef CONFIG_INET |
133 | case htons(ETH_P_IP): |
134 | return arp_find(eth->h_dest, skb); |
135 | #endif |
136 | default: |
137 | printk(KERN_DEBUG |
138 | "%s: unable to resolve type %X addresses.\n", |
139 | dev->name, ntohs(eth->h_proto)); |
140 | |
141 | memcpy(eth->h_source, dev->dev_addr, ETH_ALEN); |
142 | break; |
143 | } |
144 | |
145 | return 0; |
146 | } |
147 | EXPORT_SYMBOL(eth_rebuild_header); |
148 | |
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. |
157 | */ |
158 | __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev) |
159 | { |
160 | struct ethhdr *eth; |
161 | |
162 | skb->dev = dev; |
163 | skb_reset_mac_header(skb); |
164 | skb_pull_inline(skb, ETH_HLEN); |
165 | eth = eth_hdr(skb); |
166 | |
167 | if (unlikely(is_multicast_ether_addr(eth->h_dest))) { |
168 | if (!compare_ether_addr_64bits(eth->h_dest, dev->broadcast)) |
169 | skb->pkt_type = PACKET_BROADCAST; |
170 | else |
171 | skb->pkt_type = PACKET_MULTICAST; |
172 | } |
173 | |
174 | /* |
175 | * This ALLMULTI check should be redundant by 1.4 |
176 | * so don't forget to remove it. |
177 | * |
178 | * Seems, you forgot to remove it. All silly devices |
179 | * seems to set IFF_PROMISC. |
180 | */ |
181 | |
182 | else if (1 /*dev->flags&IFF_PROMISC */ ) { |
183 | if (unlikely(compare_ether_addr_64bits(eth->h_dest, dev->dev_addr))) |
184 | skb->pkt_type = PACKET_OTHERHOST; |
185 | } |
186 | |
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); |
195 | if (netdev_uses_trailer_tags(dev)) |
196 | return htons(ETH_P_TRAILER); |
197 | |
198 | if (ntohs(eth->h_proto) >= 1536) |
199 | return eth->h_proto; |
200 | |
201 | /* |
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. |
206 | */ |
207 | if (skb->len >= 2 && *(unsigned short *)(skb->data) == 0xFFFF) |
208 | return htons(ETH_P_802_3); |
209 | |
210 | /* |
211 | * Real 802.2 LLC |
212 | */ |
213 | return htons(ETH_P_802_2); |
214 | } |
215 | EXPORT_SYMBOL(eth_type_trans); |
216 | |
217 | /** |
218 | * eth_header_parse - extract hardware address from packet |
219 | * @skb: packet to extract header from |
220 | * @haddr: destination buffer |
221 | */ |
222 | int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
223 | { |
224 | const struct ethhdr *eth = eth_hdr(skb); |
225 | memcpy(haddr, eth->h_source, ETH_ALEN); |
226 | return ETH_ALEN; |
227 | } |
228 | EXPORT_SYMBOL(eth_header_parse); |
229 | |
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 | */ |
236 | int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh) |
237 | { |
238 | __be16 type = hh->hh_type; |
239 | struct ethhdr *eth; |
240 | const struct net_device *dev = neigh->dev; |
241 | |
242 | eth = (struct ethhdr *) |
243 | (((u8 *) hh->hh_data) + (HH_DATA_OFF(sizeof(*eth)))); |
244 | |
245 | if (type == htons(ETH_P_802_3)) |
246 | return -1; |
247 | |
248 | eth->h_proto = type; |
249 | memcpy(eth->h_source, dev->dev_addr, ETH_ALEN); |
250 | memcpy(eth->h_dest, neigh->ha, ETH_ALEN); |
251 | hh->hh_len = ETH_HLEN; |
252 | return 0; |
253 | } |
254 | EXPORT_SYMBOL(eth_header_cache); |
255 | |
256 | /** |
257 | * eth_header_cache_update - update cache entry |
258 | * @hh: destination cache entry |
259 | * @dev: network device |
260 | * @haddr: new hardware address |
261 | * |
262 | * Called by Address Resolution module to notify changes in address. |
263 | */ |
264 | void eth_header_cache_update(struct hh_cache *hh, |
265 | const struct net_device *dev, |
266 | const unsigned char *haddr) |
267 | { |
268 | memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)), |
269 | haddr, ETH_ALEN); |
270 | } |
271 | EXPORT_SYMBOL(eth_header_cache_update); |
272 | |
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 | */ |
282 | int eth_mac_addr(struct net_device *dev, void *p) |
283 | { |
284 | struct sockaddr *addr = p; |
285 | |
286 | if (netif_running(dev)) |
287 | return -EBUSY; |
288 | if (!is_valid_ether_addr(addr->sa_data)) |
289 | return -EADDRNOTAVAIL; |
290 | memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); |
291 | return 0; |
292 | } |
293 | EXPORT_SYMBOL(eth_mac_addr); |
294 | |
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 | */ |
303 | int eth_change_mtu(struct net_device *dev, int new_mtu) |
304 | { |
305 | if (new_mtu < 68 || new_mtu > ETH_DATA_LEN) |
306 | return -EINVAL; |
307 | dev->mtu = new_mtu; |
308 | return 0; |
309 | } |
310 | EXPORT_SYMBOL(eth_change_mtu); |
311 | |
312 | int eth_validate_addr(struct net_device *dev) |
313 | { |
314 | if (!is_valid_ether_addr(dev->dev_addr)) |
315 | return -EADDRNOTAVAIL; |
316 | |
317 | return 0; |
318 | } |
319 | EXPORT_SYMBOL(eth_validate_addr); |
320 | |
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 | |
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. |
333 | */ |
334 | void ether_setup(struct net_device *dev) |
335 | { |
336 | dev->header_ops = ð_header_ops; |
337 | dev->type = ARPHRD_ETHER; |
338 | dev->hard_header_len = ETH_HLEN; |
339 | dev->mtu = ETH_DATA_LEN; |
340 | dev->addr_len = ETH_ALEN; |
341 | dev->tx_queue_len = 1000; /* Ethernet wants good queues */ |
342 | dev->flags = IFF_BROADCAST|IFF_MULTICAST; |
343 | |
344 | memset(dev->broadcast, 0xFF, ETH_ALEN); |
345 | |
346 | } |
347 | EXPORT_SYMBOL(ether_setup); |
348 | |
349 | /** |
350 | * alloc_etherdev_mq - Allocates and sets up an Ethernet device |
351 | * @sizeof_priv: Size of additional driver-private structure to be allocated |
352 | * for this Ethernet device |
353 | * @queue_count: The number of queues this device has. |
354 | * |
355 | * Fill in the fields of the device structure with Ethernet-generic |
356 | * values. Basically does everything except registering the device. |
357 | * |
358 | * Constructs a new net device, complete with a private data area of |
359 | * size (sizeof_priv). A 32-byte (not bit) alignment is enforced for |
360 | * this private data area. |
361 | */ |
362 | |
363 | struct net_device *alloc_etherdev_mq(int sizeof_priv, unsigned int queue_count) |
364 | { |
365 | return alloc_netdev_mq(sizeof_priv, "eth%d", ether_setup, queue_count); |
366 | } |
367 | EXPORT_SYMBOL(alloc_etherdev_mq); |
368 | |
369 | static size_t _format_mac_addr(char *buf, int buflen, |
370 | const unsigned char *addr, int len) |
371 | { |
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; |
379 | cp += strlcpy(cp, ":", buflen - (cp - buf)); |
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); |
389 | l += strlcpy(buf + l, "\n", PAGE_SIZE - l); |
390 | return ((ssize_t) l); |
391 | } |
392 | EXPORT_SYMBOL(sysfs_format_mac); |
393 |
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