1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * NET3: Fibre Channel device handling subroutines
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Vineet Abraham <vma@iol.unh.edu>
6*4882a593Smuzhiyun * v 1.0 03/22/99
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/uaccess.h>
10*4882a593Smuzhiyun #include <linux/types.h>
11*4882a593Smuzhiyun #include <linux/kernel.h>
12*4882a593Smuzhiyun #include <linux/string.h>
13*4882a593Smuzhiyun #include <linux/mm.h>
14*4882a593Smuzhiyun #include <linux/socket.h>
15*4882a593Smuzhiyun #include <linux/in.h>
16*4882a593Smuzhiyun #include <linux/inet.h>
17*4882a593Smuzhiyun #include <linux/netdevice.h>
18*4882a593Smuzhiyun #include <linux/fcdevice.h>
19*4882a593Smuzhiyun #include <linux/skbuff.h>
20*4882a593Smuzhiyun #include <linux/errno.h>
21*4882a593Smuzhiyun #include <linux/timer.h>
22*4882a593Smuzhiyun #include <linux/net.h>
23*4882a593Smuzhiyun #include <linux/proc_fs.h>
24*4882a593Smuzhiyun #include <linux/init.h>
25*4882a593Smuzhiyun #include <linux/export.h>
26*4882a593Smuzhiyun #include <net/arp.h>
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun /*
29*4882a593Smuzhiyun * Put the headers on a Fibre Channel packet.
30*4882a593Smuzhiyun */
31*4882a593Smuzhiyun
fc_header(struct sk_buff * skb,struct net_device * dev,unsigned short type,const void * daddr,const void * saddr,unsigned int len)32*4882a593Smuzhiyun static int fc_header(struct sk_buff *skb, struct net_device *dev,
33*4882a593Smuzhiyun unsigned short type,
34*4882a593Smuzhiyun const void *daddr, const void *saddr, unsigned int len)
35*4882a593Smuzhiyun {
36*4882a593Smuzhiyun struct fch_hdr *fch;
37*4882a593Smuzhiyun int hdr_len;
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun /*
40*4882a593Smuzhiyun * Add the 802.2 SNAP header if IP as the IPv4 code calls
41*4882a593Smuzhiyun * dev->hard_header directly.
42*4882a593Smuzhiyun */
43*4882a593Smuzhiyun if (type == ETH_P_IP || type == ETH_P_ARP)
44*4882a593Smuzhiyun {
45*4882a593Smuzhiyun struct fcllc *fcllc;
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun hdr_len = sizeof(struct fch_hdr) + sizeof(struct fcllc);
48*4882a593Smuzhiyun fch = skb_push(skb, hdr_len);
49*4882a593Smuzhiyun fcllc = (struct fcllc *)(fch+1);
50*4882a593Smuzhiyun fcllc->dsap = fcllc->ssap = EXTENDED_SAP;
51*4882a593Smuzhiyun fcllc->llc = UI_CMD;
52*4882a593Smuzhiyun fcllc->protid[0] = fcllc->protid[1] = fcllc->protid[2] = 0x00;
53*4882a593Smuzhiyun fcllc->ethertype = htons(type);
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun else
56*4882a593Smuzhiyun {
57*4882a593Smuzhiyun hdr_len = sizeof(struct fch_hdr);
58*4882a593Smuzhiyun fch = skb_push(skb, hdr_len);
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun if(saddr)
62*4882a593Smuzhiyun memcpy(fch->saddr,saddr,dev->addr_len);
63*4882a593Smuzhiyun else
64*4882a593Smuzhiyun memcpy(fch->saddr,dev->dev_addr,dev->addr_len);
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun if(daddr)
67*4882a593Smuzhiyun {
68*4882a593Smuzhiyun memcpy(fch->daddr,daddr,dev->addr_len);
69*4882a593Smuzhiyun return hdr_len;
70*4882a593Smuzhiyun }
71*4882a593Smuzhiyun return -hdr_len;
72*4882a593Smuzhiyun }
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun static const struct header_ops fc_header_ops = {
75*4882a593Smuzhiyun .create = fc_header,
76*4882a593Smuzhiyun };
77*4882a593Smuzhiyun
fc_setup(struct net_device * dev)78*4882a593Smuzhiyun static void fc_setup(struct net_device *dev)
79*4882a593Smuzhiyun {
80*4882a593Smuzhiyun dev->header_ops = &fc_header_ops;
81*4882a593Smuzhiyun dev->type = ARPHRD_IEEE802;
82*4882a593Smuzhiyun dev->hard_header_len = FC_HLEN;
83*4882a593Smuzhiyun dev->mtu = 2024;
84*4882a593Smuzhiyun dev->addr_len = FC_ALEN;
85*4882a593Smuzhiyun dev->tx_queue_len = 100; /* Long queues on fc */
86*4882a593Smuzhiyun dev->flags = IFF_BROADCAST;
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun memset(dev->broadcast, 0xFF, FC_ALEN);
89*4882a593Smuzhiyun }
90*4882a593Smuzhiyun
91*4882a593Smuzhiyun /**
92*4882a593Smuzhiyun * alloc_fcdev - Register fibre channel device
93*4882a593Smuzhiyun * @sizeof_priv: Size of additional driver-private structure to be allocated
94*4882a593Smuzhiyun * for this fibre channel device
95*4882a593Smuzhiyun *
96*4882a593Smuzhiyun * Fill in the fields of the device structure with fibre channel-generic values.
97*4882a593Smuzhiyun *
98*4882a593Smuzhiyun * Constructs a new net device, complete with a private data area of
99*4882a593Smuzhiyun * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
100*4882a593Smuzhiyun * this private data area.
101*4882a593Smuzhiyun */
alloc_fcdev(int sizeof_priv)102*4882a593Smuzhiyun struct net_device *alloc_fcdev(int sizeof_priv)
103*4882a593Smuzhiyun {
104*4882a593Smuzhiyun return alloc_netdev(sizeof_priv, "fc%d", NET_NAME_UNKNOWN, fc_setup);
105*4882a593Smuzhiyun }
106*4882a593Smuzhiyun EXPORT_SYMBOL(alloc_fcdev);
107