Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Jesper Juhl | 02c30a8 | 2005-05-05 16:16:16 -0700 | [diff] [blame] | 10 | * Authors: Ross Biro |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
YOSHIFUJI Hideaki | 03d52d7 | 2007-02-09 23:24:44 +0900 | [diff] [blame] | 15 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. |
YOSHIFUJI Hideaki | 03d52d7 | 2007-02-09 23:24:44 +0900 | [diff] [blame] | 22 | * Tegge : Arp bug fixes. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | #include <linux/init.h> |
Kris Katterjohn | 46f25df | 2006-01-05 16:35:42 -0800 | [diff] [blame] | 54 | #include <linux/if_ether.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | __setup("ether=", netdev_boot_setup); |
| 64 | |
Stephen Hemminger | d3e01f7 | 2006-08-17 18:18:53 -0700 | [diff] [blame] | 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) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | * |
Stephen Hemminger | d3e01f7 | 2006-08-17 18:18:53 -0700 | [diff] [blame] | 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. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | int eth_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 79 | void *daddr, void *saddr, unsigned len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | { |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 81 | struct ethhdr *eth = (struct ethhdr *)skb_push(skb, ETH_HLEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 83 | if (type != ETH_P_802_3) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | eth->h_proto = htons(type); |
| 85 | else |
| 86 | eth->h_proto = htons(len); |
| 87 | |
| 88 | /* |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 89 | * Set the source hardware address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 92 | if (!saddr) |
| 93 | saddr = dev->dev_addr; |
| 94 | memcpy(eth->h_source, saddr, dev->addr_len); |
| 95 | |
| 96 | if (daddr) { |
| 97 | memcpy(eth->h_dest, daddr, dev->addr_len); |
Jamal Hadi Salim | f8d0e3f | 2006-02-23 16:18:01 -0800 | [diff] [blame] | 98 | return ETH_HLEN; |
| 99 | } |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 100 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | /* |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 102 | * Anyway, the loopback-device should never use this function... |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | */ |
| 104 | |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 105 | if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | memset(eth->h_dest, 0, dev->addr_len); |
| 107 | return ETH_HLEN; |
| 108 | } |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 109 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | return -ETH_HLEN; |
| 111 | } |
| 112 | |
Stephen Hemminger | d3e01f7 | 2006-08-17 18:18:53 -0700 | [diff] [blame] | 113 | /** |
| 114 | * eth_rebuild_header- rebuild the Ethernet MAC header. |
| 115 | * @skb: socket buffer to update |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | * |
Stephen Hemminger | d3e01f7 | 2006-08-17 18:18:53 -0700 | [diff] [blame] | 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. |
| 119 | * |
| 120 | * This routine CANNOT use cached dst->neigh! |
| 121 | * Really, it is used only when dst->neigh is wrong. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 128 | switch (eth->h_proto) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | #ifdef CONFIG_INET |
| 130 | case __constant_htons(ETH_P_IP): |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 131 | return arp_find(eth->h_dest, skb); |
| 132 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | default: |
| 134 | printk(KERN_DEBUG |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 135 | "%s: unable to resolve type %X addresses.\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | dev->name, (int)eth->h_proto); |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 137 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | memcpy(eth->h_source, dev->dev_addr, dev->addr_len); |
| 139 | break; |
| 140 | } |
| 141 | |
| 142 | return 0; |
| 143 | } |
| 144 | |
Stephen Hemminger | d3e01f7 | 2006-08-17 18:18:53 -0700 | [diff] [blame] | 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. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | */ |
Alexey Dobriyan | ab61148 | 2005-07-12 12:08:43 -0700 | [diff] [blame] | 154 | __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | { |
| 156 | struct ethhdr *eth; |
| 157 | unsigned char *rawp; |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 158 | |
David S. Miller | ba645c1 | 2005-09-27 16:03:05 -0700 | [diff] [blame] | 159 | skb->mac.raw = skb->data; |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 160 | skb_pull(skb, ETH_HLEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | eth = eth_hdr(skb); |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 162 | |
Kris Katterjohn | dbbc098 | 2006-01-06 13:05:58 -0800 | [diff] [blame] | 163 | if (is_multicast_ether_addr(eth->h_dest)) { |
Stephen Hemminger | 360ac8e | 2005-10-25 15:03:41 -0700 | [diff] [blame] | 164 | if (!compare_ether_addr(eth->h_dest, dev->broadcast)) |
David S. Miller | ba645c1 | 2005-09-27 16:03:05 -0700 | [diff] [blame] | 165 | skb->pkt_type = PACKET_BROADCAST; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | else |
David S. Miller | ba645c1 | 2005-09-27 16:03:05 -0700 | [diff] [blame] | 167 | skb->pkt_type = PACKET_MULTICAST; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | } |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 169 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | /* |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 171 | * This ALLMULTI check should be redundant by 1.4 |
| 172 | * so don't forget to remove it. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | * |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 174 | * Seems, you forgot to remove it. All silly devices |
| 175 | * seems to set IFF_PROMISC. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | */ |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 177 | |
| 178 | else if (1 /*dev->flags&IFF_PROMISC */ ) { |
Stephen Hemminger | 360ac8e | 2005-10-25 15:03:41 -0700 | [diff] [blame] | 179 | if (unlikely(compare_ether_addr(eth->h_dest, dev->dev_addr))) |
David S. Miller | ba645c1 | 2005-09-27 16:03:05 -0700 | [diff] [blame] | 180 | skb->pkt_type = PACKET_OTHERHOST; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | } |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 182 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | if (ntohs(eth->h_proto) >= 1536) |
| 184 | return eth->h_proto; |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 185 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | rawp = skb->data; |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 187 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | /* |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 189 | * This is a magic hack to spot IPX packets. Older Novell breaks |
| 190 | * the protocol design and runs IPX over 802.3 without an 802.2 LLC |
| 191 | * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This |
| 192 | * won't work for fault tolerant netware but does for the rest. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | */ |
| 194 | if (*(unsigned short *)rawp == 0xFFFF) |
| 195 | return htons(ETH_P_802_3); |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 196 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | /* |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 198 | * Real 802.2 LLC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | */ |
| 200 | return htons(ETH_P_802_2); |
| 201 | } |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 202 | EXPORT_SYMBOL(eth_type_trans); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | |
Stephen Hemminger | d3e01f7 | 2006-08-17 18:18:53 -0700 | [diff] [blame] | 204 | /** |
| 205 | * eth_header_parse - extract hardware address from packet |
| 206 | * @skb: packet to extract header from |
| 207 | * @haddr: destination buffer |
| 208 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | static int eth_header_parse(struct sk_buff *skb, unsigned char *haddr) |
| 210 | { |
| 211 | struct ethhdr *eth = eth_hdr(skb); |
| 212 | memcpy(haddr, eth->h_source, ETH_ALEN); |
| 213 | return ETH_ALEN; |
| 214 | } |
| 215 | |
Stephen Hemminger | d3e01f7 | 2006-08-17 18:18:53 -0700 | [diff] [blame] | 216 | /** |
| 217 | * eth_header_cache - fill cache entry from neighbour |
| 218 | * @neigh: source neighbour |
| 219 | * @hh: destination cache entry |
| 220 | * Create an Ethernet header template from the neighbour. |
| 221 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | int eth_header_cache(struct neighbour *neigh, struct hh_cache *hh) |
| 223 | { |
Al Viro | d77072e | 2006-09-28 14:20:34 -0700 | [diff] [blame] | 224 | __be16 type = hh->hh_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | struct ethhdr *eth; |
| 226 | struct net_device *dev = neigh->dev; |
| 227 | |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 228 | eth = (struct ethhdr *) |
| 229 | (((u8 *) hh->hh_data) + (HH_DATA_OFF(sizeof(*eth)))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | |
YOSHIFUJI Hideaki | f576e24 | 2007-03-07 14:19:03 +0900 | [diff] [blame^] | 231 | if (type == htons(ETH_P_802_3)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | return -1; |
| 233 | |
| 234 | eth->h_proto = type; |
| 235 | memcpy(eth->h_source, dev->dev_addr, dev->addr_len); |
| 236 | memcpy(eth->h_dest, neigh->ha, dev->addr_len); |
| 237 | hh->hh_len = ETH_HLEN; |
| 238 | return 0; |
| 239 | } |
| 240 | |
Stephen Hemminger | d3e01f7 | 2006-08-17 18:18:53 -0700 | [diff] [blame] | 241 | /** |
| 242 | * eth_header_cache_update - update cache entry |
| 243 | * @hh: destination cache entry |
| 244 | * @dev: network device |
| 245 | * @haddr: new hardware address |
| 246 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | * Called by Address Resolution module to notify changes in address. |
| 248 | */ |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 249 | void eth_header_cache_update(struct hh_cache *hh, struct net_device *dev, |
| 250 | unsigned char *haddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | { |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 252 | memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | haddr, dev->addr_len); |
| 254 | } |
| 255 | |
Stephen Hemminger | d3e01f7 | 2006-08-17 18:18:53 -0700 | [diff] [blame] | 256 | /** |
| 257 | * eth_mac_addr - set new Ethernet hardware address |
| 258 | * @dev: network device |
| 259 | * @p: socket address |
| 260 | * Change hardware address of device. |
| 261 | * |
| 262 | * This doesn't change hardware matching, so needs to be overridden |
| 263 | * for most real devices. |
| 264 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | static int eth_mac_addr(struct net_device *dev, void *p) |
| 266 | { |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 267 | struct sockaddr *addr = p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | if (netif_running(dev)) |
| 269 | return -EBUSY; |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 270 | memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | return 0; |
| 272 | } |
| 273 | |
Stephen Hemminger | d3e01f7 | 2006-08-17 18:18:53 -0700 | [diff] [blame] | 274 | /** |
| 275 | * eth_change_mtu - set new MTU size |
| 276 | * @dev: network device |
| 277 | * @new_mtu: new Maximum Transfer Unit |
| 278 | * |
| 279 | * Allow changing MTU size. Needs to be overridden for devices |
| 280 | * supporting jumbo frames. |
| 281 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | static int eth_change_mtu(struct net_device *dev, int new_mtu) |
| 283 | { |
Kris Katterjohn | 46f25df | 2006-01-05 16:35:42 -0800 | [diff] [blame] | 284 | if (new_mtu < 68 || new_mtu > ETH_DATA_LEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | return -EINVAL; |
| 286 | dev->mtu = new_mtu; |
| 287 | return 0; |
| 288 | } |
| 289 | |
Stephen Hemminger | d3e01f7 | 2006-08-17 18:18:53 -0700 | [diff] [blame] | 290 | /** |
| 291 | * ether_setup - setup Ethernet network device |
| 292 | * @dev: network device |
| 293 | * Fill in the fields of the device structure with Ethernet-generic values. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | */ |
| 295 | void ether_setup(struct net_device *dev) |
| 296 | { |
| 297 | dev->change_mtu = eth_change_mtu; |
| 298 | dev->hard_header = eth_header; |
| 299 | dev->rebuild_header = eth_rebuild_header; |
| 300 | dev->set_mac_address = eth_mac_addr; |
| 301 | dev->hard_header_cache = eth_header_cache; |
| 302 | dev->header_cache_update= eth_header_cache_update; |
| 303 | dev->hard_header_parse = eth_header_parse; |
| 304 | |
| 305 | dev->type = ARPHRD_ETHER; |
| 306 | dev->hard_header_len = ETH_HLEN; |
Kris Katterjohn | 46f25df | 2006-01-05 16:35:42 -0800 | [diff] [blame] | 307 | dev->mtu = ETH_DATA_LEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | dev->addr_len = ETH_ALEN; |
YOSHIFUJI Hideaki | 03d52d7 | 2007-02-09 23:24:44 +0900 | [diff] [blame] | 309 | dev->tx_queue_len = 1000; /* Ethernet wants good queues */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | dev->flags = IFF_BROADCAST|IFF_MULTICAST; |
YOSHIFUJI Hideaki | 03d52d7 | 2007-02-09 23:24:44 +0900 | [diff] [blame] | 311 | |
Stephen Hemminger | 2e4ca75 | 2006-08-17 18:20:18 -0700 | [diff] [blame] | 312 | memset(dev->broadcast, 0xFF, ETH_ALEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | |
| 314 | } |
| 315 | EXPORT_SYMBOL(ether_setup); |
| 316 | |
| 317 | /** |
Stephen Hemminger | d3e01f7 | 2006-08-17 18:18:53 -0700 | [diff] [blame] | 318 | * alloc_etherdev - Allocates and sets up an Ethernet device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | * @sizeof_priv: Size of additional driver-private structure to be allocated |
Stephen Hemminger | d3e01f7 | 2006-08-17 18:18:53 -0700 | [diff] [blame] | 320 | * for this Ethernet device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | * |
Stephen Hemminger | d3e01f7 | 2006-08-17 18:18:53 -0700 | [diff] [blame] | 322 | * Fill in the fields of the device structure with Ethernet-generic |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | * values. Basically does everything except registering the device. |
| 324 | * |
| 325 | * Constructs a new net device, complete with a private data area of |
Stephen Hemminger | d3e01f7 | 2006-08-17 18:18:53 -0700 | [diff] [blame] | 326 | * size (sizeof_priv). A 32-byte (not bit) alignment is enforced for |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | * this private data area. |
| 328 | */ |
| 329 | |
| 330 | struct net_device *alloc_etherdev(int sizeof_priv) |
| 331 | { |
| 332 | return alloc_netdev(sizeof_priv, "eth%d", ether_setup); |
| 333 | } |
| 334 | EXPORT_SYMBOL(alloc_etherdev); |