/* * NET3: Fibre Channel device handling subroutines * * 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. * * Vineet Abraham <vma@iol.unh.edu> * v 1.0 03/22/99 */ #include <asm/uaccess.h> #include <linux/types.h> #include <linux/kernel.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/fcdevice.h> #include <linux/skbuff.h> #include <linux/errno.h> #include <linux/timer.h> #include <linux/net.h> #include <linux/proc_fs.h> #include <linux/init.h> #include <linux/export.h> #include <net/arp.h> /* * Put the headers on a Fibre Channel packet. */ static int fc_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, const void *daddr, const void *saddr, unsigned len) { struct fch_hdr *fch; int hdr_len; /* * Add the 802.2 SNAP header if IP as the IPv4 code calls * dev->hard_header directly. */ if (type == ETH_P_IP || type == ETH_P_ARP) { struct fcllc *fcllc; hdr_len = sizeof(struct fch_hdr) + sizeof(struct fcllc); fch = (struct fch_hdr *)skb_push(skb, hdr_len); fcllc = (struct fcllc *)(fch+1); fcllc->dsap = fcllc->ssap = EXTENDED_SAP; fcllc->llc = UI_CMD; fcllc->protid[0] = fcllc->protid[1] = fcllc->protid[2] = 0x00; fcllc->ethertype = htons(type); } else { hdr_len = sizeof(struct fch_hdr); fch = (struct fch_hdr *)skb_push(skb, hdr_len); } if(saddr) memcpy(fch->saddr,saddr,dev->addr_len); else memcpy(fch->saddr,dev->dev_addr,dev->addr_len); if(daddr) { memcpy(fch->daddr,daddr,dev->addr_len); return hdr_len; } return -hdr_len; } /* * A neighbour discovery of some species (eg arp) has completed. We * can now send the packet. */ static int fc_rebuild_header(struct sk_buff *skb) { #ifdef CONFIG_INET struct fch_hdr *fch=(struct fch_hdr *)skb->data; struct fcllc *fcllc=(struct fcllc *)(skb->data+sizeof(struct fch_hdr)); if(fcllc->ethertype != htons(ETH_P_IP)) { printk("fc_rebuild_header: Don't know how to resolve type %04X addresses ?\n", ntohs(fcllc->ethertype)); return 0; } return arp_find(fch->daddr, skb); #else return 0; #endif } static const struct header_ops fc_header_ops = { .create = fc_header, .rebuild = fc_rebuild_header, }; static void fc_setup(struct net_device *dev) { dev->header_ops = &fc_header_ops; dev->type = ARPHRD_IEEE802; dev->hard_header_len = FC_HLEN; dev->mtu = 2024; dev->addr_len = FC_ALEN; dev->tx_queue_len = 100; /* Long queues on fc */ dev->flags = IFF_BROADCAST; memset(dev->broadcast, 0xFF, FC_ALEN); } /** * alloc_fcdev - Register fibre channel device * @sizeof_priv: Size of additional driver-private structure to be allocated * for this fibre channel device * * Fill in the fields of the device structure with fibre channel-generic values. * * Constructs a new net device, complete with a private data area of * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for * this private data area. */ struct net_device *alloc_fcdev(int sizeof_priv) { return alloc_netdev(sizeof_priv, "fc%d", fc_setup); } EXPORT_SYMBOL(alloc_fcdev);