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