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 <asm/uaccess.h> 14 #include <linux/types.h> 15 #include <linux/kernel.h> 16 #include <linux/string.h> 17 #include <linux/mm.h> 18 #include <linux/socket.h> 19 #include <linux/in.h> 20 #include <linux/inet.h> 21 #include <linux/netdevice.h> 22 #include <linux/fcdevice.h> 23 #include <linux/skbuff.h> 24 #include <linux/errno.h> 25 #include <linux/timer.h> 26 #include <linux/net.h> 27 #include <linux/proc_fs.h> 28 #include <linux/init.h> 29 #include <linux/export.h> 30 #include <net/arp.h> 31 32 /* 33 * Put the headers on a Fibre Channel packet. 34 */ 35 36 static int fc_header(struct sk_buff *skb, struct net_device *dev, 37 unsigned short type, 38 const void *daddr, const void *saddr, unsigned int len) 39 { 40 struct fch_hdr *fch; 41 int hdr_len; 42 43 /* 44 * Add the 802.2 SNAP header if IP as the IPv4 code calls 45 * dev->hard_header directly. 46 */ 47 if (type == ETH_P_IP || type == ETH_P_ARP) 48 { 49 struct fcllc *fcllc; 50 51 hdr_len = sizeof(struct fch_hdr) + sizeof(struct fcllc); 52 fch = (struct fch_hdr *)skb_push(skb, hdr_len); 53 fcllc = (struct fcllc *)(fch+1); 54 fcllc->dsap = fcllc->ssap = EXTENDED_SAP; 55 fcllc->llc = UI_CMD; 56 fcllc->protid[0] = fcllc->protid[1] = fcllc->protid[2] = 0x00; 57 fcllc->ethertype = htons(type); 58 } 59 else 60 { 61 hdr_len = sizeof(struct fch_hdr); 62 fch = (struct fch_hdr *)skb_push(skb, hdr_len); 63 } 64 65 if(saddr) 66 memcpy(fch->saddr,saddr,dev->addr_len); 67 else 68 memcpy(fch->saddr,dev->dev_addr,dev->addr_len); 69 70 if(daddr) 71 { 72 memcpy(fch->daddr,daddr,dev->addr_len); 73 return hdr_len; 74 } 75 return -hdr_len; 76 } 77 78 static const struct header_ops fc_header_ops = { 79 .create = fc_header, 80 }; 81 82 static void fc_setup(struct net_device *dev) 83 { 84 dev->header_ops = &fc_header_ops; 85 dev->type = ARPHRD_IEEE802; 86 dev->hard_header_len = FC_HLEN; 87 dev->mtu = 2024; 88 dev->addr_len = FC_ALEN; 89 dev->tx_queue_len = 100; /* Long queues on fc */ 90 dev->flags = IFF_BROADCAST; 91 92 memset(dev->broadcast, 0xFF, FC_ALEN); 93 } 94 95 /** 96 * alloc_fcdev - Register fibre channel device 97 * @sizeof_priv: Size of additional driver-private structure to be allocated 98 * for this fibre channel device 99 * 100 * Fill in the fields of the device structure with fibre channel-generic values. 101 * 102 * Constructs a new net device, complete with a private data area of 103 * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for 104 * this private data area. 105 */ 106 struct net_device *alloc_fcdev(int sizeof_priv) 107 { 108 return alloc_netdev(sizeof_priv, "fc%d", NET_NAME_UNKNOWN, fc_setup); 109 } 110 EXPORT_SYMBOL(alloc_fcdev); 111