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> | |
60 | #include <asm/uaccess.h> | |
61 | #include <asm/system.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 SH |
74 | * |
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. | |
1da177e4 | 77 | */ |
1da177e4 | 78 | int eth_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, |
2e4ca75b | 79 | void *daddr, void *saddr, unsigned len) |
1da177e4 | 80 | { |
2e4ca75b | 81 | struct ethhdr *eth = (struct ethhdr *)skb_push(skb, ETH_HLEN); |
1da177e4 | 82 | |
2e4ca75b | 83 | if (type != ETH_P_802_3) |
1da177e4 LT |
84 | eth->h_proto = htons(type); |
85 | else | |
86 | eth->h_proto = htons(len); | |
87 | ||
88 | /* | |
2e4ca75b | 89 | * Set the source hardware address. |
1da177e4 | 90 | */ |
2e4ca75b SH |
91 | |
92 | if (!saddr) | |
ff593c59 | 93 | saddr = dev->dev_addr; |
2e4ca75b | 94 | memcpy(eth->h_source, saddr, dev->addr_len); |
1da177e4 | 95 | |
2e4ca75b SH |
96 | if (daddr) { |
97 | memcpy(eth->h_dest, daddr, dev->addr_len); | |
f8d0e3f1 JHS |
98 | return ETH_HLEN; |
99 | } | |
2e4ca75b | 100 | |
1da177e4 | 101 | /* |
2e4ca75b | 102 | * Anyway, the loopback-device should never use this function... |
1da177e4 LT |
103 | */ |
104 | ||
2e4ca75b | 105 | if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) { |
1da177e4 LT |
106 | memset(eth->h_dest, 0, dev->addr_len); |
107 | return ETH_HLEN; | |
108 | } | |
2e4ca75b | 109 | |
1da177e4 LT |
110 | return -ETH_HLEN; |
111 | } | |
112 | ||
d3e01f71 SH |
113 | /** |
114 | * eth_rebuild_header- rebuild the Ethernet MAC header. | |
115 | * @skb: socket buffer to update | |
116 | * | |
117 | * This is called after an ARP or IPV6 ndisc it's resolution on this | |
118 | * sk_buff. We now let protocol (ARP) fill in the other fields. | |
1da177e4 | 119 | * |
d3e01f71 SH |
120 | * This routine CANNOT use cached dst->neigh! |
121 | * Really, it is used only when dst->neigh is wrong. | |
1da177e4 | 122 | */ |
1da177e4 LT |
123 | int eth_rebuild_header(struct sk_buff *skb) |
124 | { | |
125 | struct ethhdr *eth = (struct ethhdr *)skb->data; | |
126 | struct net_device *dev = skb->dev; | |
127 | ||
2e4ca75b | 128 | switch (eth->h_proto) { |
1da177e4 LT |
129 | #ifdef CONFIG_INET |
130 | case __constant_htons(ETH_P_IP): | |
2e4ca75b SH |
131 | return arp_find(eth->h_dest, skb); |
132 | #endif | |
1da177e4 LT |
133 | default: |
134 | printk(KERN_DEBUG | |
2e4ca75b | 135 | "%s: unable to resolve type %X addresses.\n", |
1da177e4 | 136 | dev->name, (int)eth->h_proto); |
2e4ca75b | 137 | |
1da177e4 LT |
138 | memcpy(eth->h_source, dev->dev_addr, dev->addr_len); |
139 | break; | |
140 | } | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
d3e01f71 SH |
145 | /** |
146 | * eth_type_trans - determine the packet's protocol ID. | |
147 | * @skb: received socket data | |
148 | * @dev: receiving network device | |
149 | * | |
150 | * The rule here is that we | |
151 | * assume 802.3 if the type field is short enough to be a length. | |
152 | * This is normal practice and works for any 'now in use' protocol. | |
1da177e4 | 153 | */ |
ab611487 | 154 | __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
155 | { |
156 | struct ethhdr *eth; | |
157 | unsigned char *rawp; | |
2e4ca75b | 158 | |
4c13eb66 | 159 | skb->dev = dev; |
459a98ed | 160 | skb_reset_mac_header(skb); |
2e4ca75b | 161 | skb_pull(skb, ETH_HLEN); |
1da177e4 | 162 | eth = eth_hdr(skb); |
2e4ca75b | 163 | |
dbbc0988 | 164 | if (is_multicast_ether_addr(eth->h_dest)) { |
360ac8e2 | 165 | if (!compare_ether_addr(eth->h_dest, dev->broadcast)) |
ba645c16 | 166 | skb->pkt_type = PACKET_BROADCAST; |
1da177e4 | 167 | else |
ba645c16 | 168 | skb->pkt_type = PACKET_MULTICAST; |
1da177e4 | 169 | } |
2e4ca75b | 170 | |
1da177e4 | 171 | /* |
2e4ca75b SH |
172 | * This ALLMULTI check should be redundant by 1.4 |
173 | * so don't forget to remove it. | |
1da177e4 | 174 | * |
2e4ca75b SH |
175 | * Seems, you forgot to remove it. All silly devices |
176 | * seems to set IFF_PROMISC. | |
1da177e4 | 177 | */ |
2e4ca75b SH |
178 | |
179 | else if (1 /*dev->flags&IFF_PROMISC */ ) { | |
360ac8e2 | 180 | if (unlikely(compare_ether_addr(eth->h_dest, dev->dev_addr))) |
ba645c16 | 181 | skb->pkt_type = PACKET_OTHERHOST; |
1da177e4 | 182 | } |
2e4ca75b | 183 | |
1da177e4 LT |
184 | if (ntohs(eth->h_proto) >= 1536) |
185 | return eth->h_proto; | |
2e4ca75b | 186 | |
1da177e4 | 187 | rawp = skb->data; |
2e4ca75b | 188 | |
1da177e4 | 189 | /* |
2e4ca75b SH |
190 | * This is a magic hack to spot IPX packets. Older Novell breaks |
191 | * the protocol design and runs IPX over 802.3 without an 802.2 LLC | |
192 | * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This | |
193 | * won't work for fault tolerant netware but does for the rest. | |
1da177e4 LT |
194 | */ |
195 | if (*(unsigned short *)rawp == 0xFFFF) | |
196 | return htons(ETH_P_802_3); | |
2e4ca75b | 197 | |
1da177e4 | 198 | /* |
2e4ca75b | 199 | * Real 802.2 LLC |
1da177e4 LT |
200 | */ |
201 | return htons(ETH_P_802_2); | |
202 | } | |
2e4ca75b | 203 | EXPORT_SYMBOL(eth_type_trans); |
1da177e4 | 204 | |
d3e01f71 SH |
205 | /** |
206 | * eth_header_parse - extract hardware address from packet | |
207 | * @skb: packet to extract header from | |
208 | * @haddr: destination buffer | |
209 | */ | |
1da177e4 LT |
210 | static int eth_header_parse(struct sk_buff *skb, unsigned char *haddr) |
211 | { | |
212 | struct ethhdr *eth = eth_hdr(skb); | |
213 | memcpy(haddr, eth->h_source, ETH_ALEN); | |
214 | return ETH_ALEN; | |
215 | } | |
216 | ||
d3e01f71 SH |
217 | /** |
218 | * eth_header_cache - fill cache entry from neighbour | |
219 | * @neigh: source neighbour | |
220 | * @hh: destination cache entry | |
221 | * Create an Ethernet header template from the neighbour. | |
222 | */ | |
1da177e4 LT |
223 | int eth_header_cache(struct neighbour *neigh, struct hh_cache *hh) |
224 | { | |
d77072ec | 225 | __be16 type = hh->hh_type; |
1da177e4 LT |
226 | struct ethhdr *eth; |
227 | struct net_device *dev = neigh->dev; | |
228 | ||
2e4ca75b SH |
229 | eth = (struct ethhdr *) |
230 | (((u8 *) hh->hh_data) + (HH_DATA_OFF(sizeof(*eth)))); | |
1da177e4 | 231 | |
f576e24f | 232 | if (type == htons(ETH_P_802_3)) |
1da177e4 LT |
233 | return -1; |
234 | ||
235 | eth->h_proto = type; | |
236 | memcpy(eth->h_source, dev->dev_addr, dev->addr_len); | |
237 | memcpy(eth->h_dest, neigh->ha, dev->addr_len); | |
238 | hh->hh_len = ETH_HLEN; | |
239 | return 0; | |
240 | } | |
241 | ||
d3e01f71 SH |
242 | /** |
243 | * eth_header_cache_update - update cache entry | |
244 | * @hh: destination cache entry | |
245 | * @dev: network device | |
246 | * @haddr: new hardware address | |
247 | * | |
1da177e4 LT |
248 | * Called by Address Resolution module to notify changes in address. |
249 | */ | |
2e4ca75b SH |
250 | void eth_header_cache_update(struct hh_cache *hh, struct net_device *dev, |
251 | unsigned char *haddr) | |
1da177e4 | 252 | { |
2e4ca75b | 253 | memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)), |
1da177e4 LT |
254 | haddr, dev->addr_len); |
255 | } | |
256 | ||
d3e01f71 SH |
257 | /** |
258 | * eth_mac_addr - set new Ethernet hardware address | |
259 | * @dev: network device | |
260 | * @p: socket address | |
261 | * Change hardware address of device. | |
262 | * | |
263 | * This doesn't change hardware matching, so needs to be overridden | |
264 | * for most real devices. | |
265 | */ | |
1da177e4 LT |
266 | static int eth_mac_addr(struct net_device *dev, void *p) |
267 | { | |
2e4ca75b | 268 | struct sockaddr *addr = p; |
71bffe55 | 269 | |
1da177e4 LT |
270 | if (netif_running(dev)) |
271 | return -EBUSY; | |
71bffe55 PM |
272 | if (!is_valid_ether_addr(addr->sa_data)) |
273 | return -EADDRNOTAVAIL; | |
2e4ca75b | 274 | memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); |
1da177e4 LT |
275 | return 0; |
276 | } | |
277 | ||
d3e01f71 SH |
278 | /** |
279 | * eth_change_mtu - set new MTU size | |
280 | * @dev: network device | |
281 | * @new_mtu: new Maximum Transfer Unit | |
282 | * | |
283 | * Allow changing MTU size. Needs to be overridden for devices | |
284 | * supporting jumbo frames. | |
285 | */ | |
1da177e4 LT |
286 | static int eth_change_mtu(struct net_device *dev, int new_mtu) |
287 | { | |
46f25dff | 288 | if (new_mtu < 68 || new_mtu > ETH_DATA_LEN) |
1da177e4 LT |
289 | return -EINVAL; |
290 | dev->mtu = new_mtu; | |
291 | return 0; | |
292 | } | |
293 | ||
d3e01f71 SH |
294 | /** |
295 | * ether_setup - setup Ethernet network device | |
296 | * @dev: network device | |
297 | * Fill in the fields of the device structure with Ethernet-generic values. | |
1da177e4 LT |
298 | */ |
299 | void ether_setup(struct net_device *dev) | |
300 | { | |
301 | dev->change_mtu = eth_change_mtu; | |
302 | dev->hard_header = eth_header; | |
303 | dev->rebuild_header = eth_rebuild_header; | |
304 | dev->set_mac_address = eth_mac_addr; | |
305 | dev->hard_header_cache = eth_header_cache; | |
306 | dev->header_cache_update= eth_header_cache_update; | |
307 | dev->hard_header_parse = eth_header_parse; | |
308 | ||
309 | dev->type = ARPHRD_ETHER; | |
310 | dev->hard_header_len = ETH_HLEN; | |
46f25dff | 311 | dev->mtu = ETH_DATA_LEN; |
1da177e4 | 312 | dev->addr_len = ETH_ALEN; |
03d52d7c | 313 | dev->tx_queue_len = 1000; /* Ethernet wants good queues */ |
1da177e4 | 314 | dev->flags = IFF_BROADCAST|IFF_MULTICAST; |
03d52d7c | 315 | |
2e4ca75b | 316 | memset(dev->broadcast, 0xFF, ETH_ALEN); |
1da177e4 LT |
317 | |
318 | } | |
319 | EXPORT_SYMBOL(ether_setup); | |
320 | ||
321 | /** | |
f25f4e44 | 322 | * alloc_etherdev_mq - Allocates and sets up an Ethernet device |
1da177e4 | 323 | * @sizeof_priv: Size of additional driver-private structure to be allocated |
d3e01f71 | 324 | * for this Ethernet device |
f25f4e44 | 325 | * @queue_count: The number of queues this device has. |
1da177e4 | 326 | * |
d3e01f71 | 327 | * Fill in the fields of the device structure with Ethernet-generic |
1da177e4 LT |
328 | * values. Basically does everything except registering the device. |
329 | * | |
330 | * Constructs a new net device, complete with a private data area of | |
d3e01f71 | 331 | * size (sizeof_priv). A 32-byte (not bit) alignment is enforced for |
1da177e4 LT |
332 | * this private data area. |
333 | */ | |
334 | ||
f25f4e44 | 335 | struct net_device *alloc_etherdev_mq(int sizeof_priv, unsigned int queue_count) |
1da177e4 | 336 | { |
f25f4e44 | 337 | return alloc_netdev_mq(sizeof_priv, "eth%d", ether_setup, queue_count); |
1da177e4 | 338 | } |
f25f4e44 | 339 | EXPORT_SYMBOL(alloc_etherdev_mq); |