1/* 2 * NET3: Fibre Channel device handling subroutines 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * Vineet Abraham <vma@iol.unh.edu> 10 * v 1.0 03/22/99 11 */ 12 13#include <linux/config.h> 14#include <asm/uaccess.h> 15#include <asm/system.h> 16#include <linux/types.h> 17#include <linux/kernel.h> 18#include <linux/sched.h> 19#include <linux/string.h> 20#include <linux/mm.h> 21#include <linux/socket.h> 22#include <linux/in.h> 23#include <linux/inet.h> 24#include <linux/netdevice.h> 25#include <linux/fcdevice.h> 26#include <linux/skbuff.h> 27#include <linux/errno.h> 28#include <linux/timer.h> 29#include <linux/net.h> 30#include <linux/proc_fs.h> 31#include <linux/init.h> 32#include <net/arp.h> 33 34/* 35 * Put the headers on a Fibre Channel packet. 36 */ 37 38int fc_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, 39 void *daddr, void *saddr, unsigned len) 40{ 41 struct fch_hdr *fch; 42 int hdr_len; 43 44 /* 45 * Add the 802.2 SNAP header if IP as the IPv4 code calls 46 * dev->hard_header directly. 47 */ 48 if (type == ETH_P_IP || type == ETH_P_ARP) 49 { 50 struct fcllc *fcllc=(struct fcllc *)(fch+1); 51 52 hdr_len = sizeof(struct fch_hdr) + sizeof(struct fcllc); 53 fch = (struct fch_hdr *)skb_push(skb, hdr_len); 54 fcllc = (struct fcllc *)(fch+1); 55 fcllc->dsap = fcllc->ssap = EXTENDED_SAP; 56 fcllc->llc = UI_CMD; 57 fcllc->protid[0] = fcllc->protid[1] = fcllc->protid[2] = 0x00; 58 fcllc->ethertype = htons(type); 59 } 60 else 61 { 62 hdr_len = sizeof(struct fch_hdr); 63 fch = (struct fch_hdr *)skb_push(skb, hdr_len); 64 } 65 66 if(saddr) 67 memcpy(fch->saddr,saddr,dev->addr_len); 68 else 69 memcpy(fch->saddr,dev->dev_addr,dev->addr_len); 70 71 if(daddr) 72 { 73 memcpy(fch->daddr,daddr,dev->addr_len); 74 return(hdr_len); 75 } 76 return -hdr_len; 77} 78 79/* 80 * A neighbour discovery of some species (eg arp) has completed. We 81 * can now send the packet. 82 */ 83 84int fc_rebuild_header(struct sk_buff *skb) 85{ 86 struct fch_hdr *fch=(struct fch_hdr *)skb->data; 87 struct fcllc *fcllc=(struct fcllc *)(skb->data+sizeof(struct fch_hdr)); 88 if(fcllc->ethertype != htons(ETH_P_IP)) { 89 printk("fc_rebuild_header: Don't know how to resolve type %04X addresses ?\n",(unsigned int)htons(fcllc->ethertype)); 90 return 0; 91 } 92#ifdef CONFIG_INET 93 return arp_find(fch->daddr, skb); 94#else 95 return 0; 96#endif 97} 98 99