| /* |
| * INET An implementation of the TCP/IP protocol suite for the LINUX |
| * operating system. INET is implemented using the BSD Socket |
| * interface as the means of communication with the user level. |
| * |
| * HIPPI-type device handling. |
| * |
| * Version: @(#)hippi.c 1.0.0 05/29/97 |
| * |
| * Authors: Ross Biro, <bir7@leland.Stanford.Edu> |
| * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| * Mark Evans, <evansmp@uhura.aston.ac.uk> |
| * Florian La Roche, <rzsfl@rz.uni-sb.de> |
| * Alan Cox, <gw4pts@gw4pts.ampr.org> |
| * Jes Sorensen, <Jes.Sorensen@cern.ch> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/string.h> |
| #include <linux/mm.h> |
| #include <linux/socket.h> |
| #include <linux/in.h> |
| #include <linux/inet.h> |
| #include <linux/netdevice.h> |
| #include <linux/hippidevice.h> |
| #include <linux/skbuff.h> |
| #include <linux/errno.h> |
| #include <net/arp.h> |
| #include <net/sock.h> |
| #include <asm/uaccess.h> |
| #include <asm/checksum.h> |
| #include <asm/system.h> |
| |
| /* |
| * hippi_net_init() |
| * |
| * Do nothing, this is just to pursuade the stupid linker to behave. |
| */ |
| |
| void hippi_net_init(void) |
| { |
| return; |
| } |
| |
| /* |
| * Create the HIPPI MAC header for an arbitrary protocol layer |
| * |
| * saddr=NULL means use device source address |
| * daddr=NULL means leave destination address (eg unresolved arp) |
| */ |
| |
| int hippi_header(struct sk_buff *skb, struct net_device *dev, |
| unsigned short type, void *daddr, void *saddr, |
| unsigned len) |
| { |
| struct hippi_hdr *hip = (struct hippi_hdr *)skb_push(skb, HIPPI_HLEN); |
| |
| if (!len){ |
| len = skb->len - HIPPI_HLEN; |
| printk("hippi_header(): length not supplied\n"); |
| } |
| |
| /* |
| * Due to the stupidity of the little endian byte-order we |
| * have to set the fp field this way. |
| */ |
| hip->fp.fixed = __constant_htonl(0x04800018); |
| hip->fp.d2_size = htonl(len + 8); |
| hip->le.fc = 0; |
| hip->le.double_wide = 0; /* only HIPPI 800 for the time being */ |
| hip->le.message_type = 0; /* Data PDU */ |
| |
| hip->le.dest_addr_type = 2; /* 12 bit SC address */ |
| hip->le.src_addr_type = 2; /* 12 bit SC address */ |
| |
| memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3); |
| memset(&hip->le.reserved, 0, 16); |
| |
| hip->snap.dsap = HIPPI_EXTENDED_SAP; |
| hip->snap.ssap = HIPPI_EXTENDED_SAP; |
| hip->snap.ctrl = HIPPI_UI_CMD; |
| hip->snap.oui[0] = 0x00; |
| hip->snap.oui[1] = 0x00; |
| hip->snap.oui[2] = 0x00; |
| hip->snap.ethertype = htons(type); |
| |
| if (daddr) |
| { |
| memcpy(hip->le.dest_switch_addr, daddr + 3, 3); |
| memcpy(&skb->private.ifield, daddr + 2, 4); |
| return HIPPI_HLEN; |
| } |
| return -((int)HIPPI_HLEN); |
| } |
| |
| |
| /* |
| * Rebuild the HIPPI MAC header. This is called after an ARP has |
| * completed on this sk_buff. We now let ARP fill in the other fields. |
| */ |
| |
| int hippi_rebuild_header(struct sk_buff *skb) |
| { |
| struct hippi_hdr *hip = (struct hippi_hdr *)skb->data; |
| |
| /* |
| * Only IP is currently supported |
| */ |
| |
| if(hip->snap.ethertype != __constant_htons(ETH_P_IP)) |
| { |
| printk(KERN_DEBUG "%s: unable to resolve type %X addresses.\n",skb->dev->name,ntohs(hip->snap.ethertype)); |
| return 0; |
| } |
| |
| /* |
| * We don't support dynamic ARP on HIPPI, but we use the ARP |
| * static ARP tables to hold the I-FIELDs. |
| */ |
| return arp_find(hip->le.daddr, skb); |
| } |
| |
| |
| /* |
| * Determine the packet's protocol ID. |
| */ |
| |
| unsigned short hippi_type_trans(struct sk_buff *skb, struct net_device *dev) |
| { |
| struct hippi_hdr *hip; |
| |
| hip = (struct hippi_hdr *) skb->data; |
| |
| /* |
| * This is actually wrong ... question is if we really should |
| * set the raw address here. |
| */ |
| skb->mac.raw = skb->data; |
| skb_pull(skb, HIPPI_HLEN); |
| |
| /* |
| * No fancy promisc stuff here now. |
| */ |
| |
| return hip->snap.ethertype; |
| } |
| |
| EXPORT_SYMBOL(hippi_type_trans); |