direct-io.hg

view xen/net/eth.c @ 364:942eb9bcae13

bitkeeper revision 1.170 (3e9c936fXyHEI0NKOWQkP9tHN4sbqw)

Many files:
Finished virtualisation of x86 LDT. Xenolinux now exports this to applications (eg. for use by linuxthreads).
author kaf24@scramble.cl.cam.ac.uk
date Tue Apr 15 23:19:11 2003 +0000 (2003-04-15)
parents 170eb7974e43
children 890460f07ddf
line source
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, <bir7@leland.Stanford.Edu>
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/types.h>
41 //#include <linux/kernel.h>
42 #include <linux/sched.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/config.h>
54 #include <linux/lib.h>
55 #include <linux/init.h>
56 //#include <net/dst.h>
57 //#include <net/arp.h>
58 //#include <net/sock.h>
59 //#include <net/ipv6.h>
60 //#include <net/ip.h>
61 #include <asm/uaccess.h>
62 #include <asm/system.h>
63 //#include <asm/checksum.h>
65 //extern int __init netdev_boot_setup(char *str);
67 //__setup("ether=", netdev_boot_setup);
69 /*
70 * Create the Ethernet MAC header for an arbitrary protocol layer
71 *
72 * saddr=NULL means use device source address
73 * daddr=NULL means leave destination address (eg unresolved arp)
74 */
76 int eth_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
77 void *daddr, void *saddr, unsigned len)
78 {
79 struct ethhdr *eth = (struct ethhdr *)skb_push(skb,ETH_HLEN);
81 /*
82 * Set the protocol type. For a packet of type ETH_P_802_3 we put the length
83 * in here instead. It is up to the 802.2 layer to carry protocol information.
84 */
86 if(type!=ETH_P_802_3)
87 eth->h_proto = htons(type);
88 else
89 eth->h_proto = htons(len);
91 /*
92 * Set the source hardware address.
93 */
95 if(saddr)
96 memcpy(eth->h_source,saddr,dev->addr_len);
97 else
98 memcpy(eth->h_source,dev->dev_addr,dev->addr_len);
100 /*
101 * Anyway, the loopback-device should never use this function...
102 */
104 if (dev->flags & (IFF_LOOPBACK|IFF_NOARP))
105 {
106 memset(eth->h_dest, 0, dev->addr_len);
107 return(dev->hard_header_len);
108 }
110 if(daddr)
111 {
112 memcpy(eth->h_dest,daddr,dev->addr_len);
113 return dev->hard_header_len;
114 }
116 return -dev->hard_header_len;
117 }
120 /*
121 * Rebuild the Ethernet MAC header. This is called after an ARP
122 * (or in future other address resolution) has completed on this
123 * sk_buff. We now let ARP fill in the other fields.
124 *
125 * This routine CANNOT use cached dst->neigh!
126 * Really, it is used only when dst->neigh is wrong.
127 */
129 int eth_rebuild_header(struct sk_buff *skb)
130 {
131 struct ethhdr *eth = (struct ethhdr *)skb->data;
132 struct net_device *dev = skb->dev;
134 switch (eth->h_proto)
135 {
136 #ifdef CONFIG_INET
137 case __constant_htons(ETH_P_IP):
138 return arp_find(eth->h_dest, skb);
139 #endif
140 default:
141 printk(KERN_DEBUG
142 "%s: unable to resolve type %X addresses.\n",
143 dev->name, (int)eth->h_proto);
145 memcpy(eth->h_source, dev->dev_addr, dev->addr_len);
146 break;
147 }
149 return 0;
150 }
153 /*
154 * Determine the packet's protocol ID. 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 */
159 unsigned short eth_type_trans(struct sk_buff *skb, struct net_device *dev)
160 {
161 struct ethhdr *eth;
162 unsigned char *rawp;
164 if (skb->skb_type == SKB_ZERO_COPY)
165 {
166 skb_pull(skb,dev->hard_header_len);
167 skb->mac.raw= (void *)0xdeadbeef;
168 return htons(ETH_P_802_2);
170 } else { // SKB_NORMAL
172 skb->mac.raw=skb->data;
173 skb_pull(skb,dev->hard_header_len);
174 eth= skb->mac.ethernet;
176 if(*eth->h_dest&1)
177 {
178 if(memcmp(eth->h_dest,dev->broadcast, ETH_ALEN)==0)
179 skb->pkt_type=PACKET_BROADCAST;
180 else
181 skb->pkt_type=PACKET_MULTICAST;
182 }
184 /*
185 * This ALLMULTI check should be redundant by 1.4
186 * so don't forget to remove it.
187 *
188 * Seems, you forgot to remove it. All silly devices
189 * seems to set IFF_PROMISC.
190 */
192 else if(1 /*dev->flags&IFF_PROMISC*/)
193 {
194 if(memcmp(eth->h_dest,dev->dev_addr, ETH_ALEN))
195 skb->pkt_type=PACKET_OTHERHOST;
196 }
198 if (ntohs(eth->h_proto) >= 1536)
199 return eth->h_proto;
201 rawp = skb->data;
203 /*
204 * This is a magic hack to spot IPX packets. Older Novell breaks
205 * the protocol design and runs IPX over 802.3 without an 802.2 LLC
206 * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
207 * won't work for fault tolerant netware but does for the rest.
208 */
209 if (*(unsigned short *)rawp == 0xFFFF)
210 return htons(ETH_P_802_3);
212 /*
213 * Real 802.2 LLC
214 */
215 return htons(ETH_P_802_2);
216 }
217 }
220 int eth_header_parse(struct sk_buff *skb, unsigned char *haddr)
221 {
222 struct ethhdr *eth = skb->mac.ethernet;
223 memcpy(haddr, eth->h_source, ETH_ALEN);
224 return ETH_ALEN;
225 }
227 int eth_header_cache(struct neighbour *neigh, struct hh_cache *hh)
228 {
229 #if 0
230 unsigned short type = hh->hh_type;
231 struct ethhdr *eth = (struct ethhdr*)(((u8*)hh->hh_data) + 2);
232 struct net_device *dev = neigh->dev;
234 if (type == __constant_htons(ETH_P_802_3))
235 return -1;
237 eth->h_proto = type;
238 memcpy(eth->h_source, dev->dev_addr, dev->addr_len);
239 memcpy(eth->h_dest, neigh->ha, dev->addr_len);
240 hh->hh_len = ETH_HLEN;
241 #endif
242 return 0;
243 }
245 /*
246 * Called by Address Resolution module to notify changes in address.
247 */
249 void eth_header_cache_update(struct hh_cache *hh, struct net_device *dev, unsigned char * haddr)
250 {
251 memcpy(((u8*)hh->hh_data) + 2, haddr, dev->addr_len);
252 }