diff options
Diffstat (limited to 'net/802/fc.c')
| -rw-r--r-- | net/802/fc.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/net/802/fc.c b/net/802/fc.c new file mode 100644 index 00000000..b324e314 --- /dev/null +++ b/net/802/fc.c @@ -0,0 +1,131 @@ +/* + * 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); |