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 (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, len: 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, len: 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 = { |
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 | |