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1 | /* |
2 | * NET3: Fibre Channel device handling subroutines |
3 | * |
4 | * This program is free software; you can redistribute it and/or |
5 | * modify it under the terms of the GNU General Public License |
6 | * as published by the Free Software Foundation; either version |
7 | * 2 of the License, or (at your option) any later version. |
8 | * |
9 | * Vineet Abraham <vma@iol.unh.edu> |
10 | * v 1.0 03/22/99 |
11 | */ |
12 | |
13 | #include <asm/uaccess.h> |
14 | #include <linux/types.h> |
15 | #include <linux/kernel.h> |
16 | #include <linux/string.h> |
17 | #include <linux/mm.h> |
18 | #include <linux/socket.h> |
19 | #include <linux/in.h> |
20 | #include <linux/inet.h> |
21 | #include <linux/netdevice.h> |
22 | #include <linux/fcdevice.h> |
23 | #include <linux/skbuff.h> |
24 | #include <linux/errno.h> |
25 | #include <linux/timer.h> |
26 | #include <linux/net.h> |
27 | #include <linux/proc_fs.h> |
28 | #include <linux/init.h> |
29 | #include <linux/export.h> |
30 | #include <net/arp.h> |
31 | |
32 | /* |
33 | * Put the headers on a Fibre Channel packet. |
34 | */ |
35 | |
36 | static int fc_header(struct sk_buff *skb, struct net_device *dev, |
37 | unsigned short type, |
38 | const void *daddr, const void *saddr, unsigned len) |
39 | { |
40 | struct fch_hdr *fch; |
41 | int hdr_len; |
42 | |
43 | /* |
44 | * Add the 802.2 SNAP header if IP as the IPv4 code calls |
45 | * dev->hard_header directly. |
46 | */ |
47 | if (type == ETH_P_IP || type == ETH_P_ARP) |
48 | { |
49 | struct fcllc *fcllc; |
50 | |
51 | hdr_len = sizeof(struct fch_hdr) + sizeof(struct fcllc); |
52 | fch = (struct fch_hdr *)skb_push(skb, hdr_len); |
53 | fcllc = (struct fcllc *)(fch+1); |
54 | fcllc->dsap = fcllc->ssap = EXTENDED_SAP; |
55 | fcllc->llc = UI_CMD; |
56 | fcllc->protid[0] = fcllc->protid[1] = fcllc->protid[2] = 0x00; |
57 | fcllc->ethertype = htons(type); |
58 | } |
59 | else |
60 | { |
61 | hdr_len = sizeof(struct fch_hdr); |
62 | fch = (struct fch_hdr *)skb_push(skb, hdr_len); |
63 | } |
64 | |
65 | if(saddr) |
66 | memcpy(fch->saddr,saddr,dev->addr_len); |
67 | else |
68 | memcpy(fch->saddr,dev->dev_addr,dev->addr_len); |
69 | |
70 | if(daddr) |
71 | { |
72 | memcpy(fch->daddr,daddr,dev->addr_len); |
73 | return hdr_len; |
74 | } |
75 | return -hdr_len; |
76 | } |
77 | |
78 | /* |
79 | * A neighbour discovery of some species (eg arp) has completed. We |
80 | * can now send the packet. |
81 | */ |
82 | |
83 | static int fc_rebuild_header(struct sk_buff *skb) |
84 | { |
85 | #ifdef CONFIG_INET |
86 | struct fch_hdr *fch=(struct fch_hdr *)skb->data; |
87 | struct fcllc *fcllc=(struct fcllc *)(skb->data+sizeof(struct fch_hdr)); |
88 | if(fcllc->ethertype != htons(ETH_P_IP)) { |
89 | printk("fc_rebuild_header: Don't know how to resolve type %04X addresses ?\n", ntohs(fcllc->ethertype)); |
90 | return 0; |
91 | } |
92 | return arp_find(fch->daddr, skb); |
93 | #else |
94 | return 0; |
95 | #endif |
96 | } |
97 | |
98 | static const struct header_ops fc_header_ops = { |
99 | .create = fc_header, |
100 | .rebuild = fc_rebuild_header, |
101 | }; |
102 | |
103 | static void fc_setup(struct net_device *dev) |
104 | { |
105 | dev->header_ops = &fc_header_ops; |
106 | dev->type = ARPHRD_IEEE802; |
107 | dev->hard_header_len = FC_HLEN; |
108 | dev->mtu = 2024; |
109 | dev->addr_len = FC_ALEN; |
110 | dev->tx_queue_len = 100; /* Long queues on fc */ |
111 | dev->flags = IFF_BROADCAST; |
112 | |
113 | memset(dev->broadcast, 0xFF, FC_ALEN); |
114 | } |
115 | |
116 | /** |
117 | * alloc_fcdev - Register fibre channel device |
118 | * @sizeof_priv: Size of additional driver-private structure to be allocated |
119 | * for this fibre channel device |
120 | * |
121 | * Fill in the fields of the device structure with fibre channel-generic values. |
122 | * |
123 | * Constructs a new net device, complete with a private data area of |
124 | * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for |
125 | * this private data area. |
126 | */ |
127 | struct net_device *alloc_fcdev(int sizeof_priv) |
128 | { |
129 | return alloc_netdev(sizeof_priv, "fc%d", fc_setup); |
130 | } |
131 | EXPORT_SYMBOL(alloc_fcdev); |
132 |
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