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 <asm/system.h> 15 #include <linux/types.h> 16 #include <linux/kernel.h> 17 #include <linux/string.h> 18 #include <linux/mm.h> 19 #include <linux/socket.h> 20 #include <linux/in.h> 21 #include <linux/inet.h> 22 #include <linux/netdevice.h> 23 #include <linux/fcdevice.h> 24 #include <linux/skbuff.h> 25 #include <linux/errno.h> 26 #include <linux/timer.h> 27 #include <linux/net.h> 28 #include <linux/proc_fs.h> 29 #include <linux/init.h> 30 #include <linux/export.h> 31 #include <net/arp.h> 32 33 /* 34 * Put the headers on a Fibre Channel packet. 35 */ 36 37 static int fc_header(struct sk_buff *skb, struct net_device *dev, 38 unsigned short type, 39 const void *daddr, const 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; 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 84 static int fc_rebuild_header(struct sk_buff *skb) 85 { 86 #ifdef CONFIG_INET 87 struct fch_hdr *fch=(struct fch_hdr *)skb->data; 88 struct fcllc *fcllc=(struct fcllc *)(skb->data+sizeof(struct fch_hdr)); 89 if(fcllc->ethertype != htons(ETH_P_IP)) { 90 printk("fc_rebuild_header: Don't know how to resolve type %04X addresses ?\n", ntohs(fcllc->ethertype)); 91 return 0; 92 } 93 return arp_find(fch->daddr, skb); 94 #else 95 return 0; 96 #endif 97 } 98 99 static const struct header_ops fc_header_ops = { 100 .create = fc_header, 101 .rebuild = fc_rebuild_header, 102 }; 103 104 static void fc_setup(struct net_device *dev) 105 { 106 dev->header_ops = &fc_header_ops; 107 dev->type = ARPHRD_IEEE802; 108 dev->hard_header_len = FC_HLEN; 109 dev->mtu = 2024; 110 dev->addr_len = FC_ALEN; 111 dev->tx_queue_len = 100; /* Long queues on fc */ 112 dev->flags = IFF_BROADCAST; 113 114 memset(dev->broadcast, 0xFF, FC_ALEN); 115 } 116 117 /** 118 * alloc_fcdev - Register fibre channel device 119 * @sizeof_priv: Size of additional driver-private structure to be allocated 120 * for this fibre channel device 121 * 122 * Fill in the fields of the device structure with fibre channel-generic values. 123 * 124 * Constructs a new net device, complete with a private data area of 125 * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for 126 * this private data area. 127 */ 128 struct net_device *alloc_fcdev(int sizeof_priv) 129 { 130 return alloc_netdev(sizeof_priv, "fc%d", fc_setup); 131 } 132 EXPORT_SYMBOL(alloc_fcdev); 133