1 // SPDX-License-Identifier: GPL-2.0-or-later 1
2 /*
3 * INET An implementation of the TCP/I
4 * operating system. INET is imp
5 * interface as the means of comm
6 *
7 * FDDI-type device handling.
8 *
9 * Version: @(#)fddi.c 1.0.0 08/12/
10 *
11 * Authors: Lawrence V. Stefani, <stefani@
12 *
13 * fddi.c is based on previous et
14 * Ross Biro
15 * Fred N. van Kempen, <w
16 * Mark Evans, <evansmp@u
17 * Florian La Roche, <rzs
18 * Alan Cox, <gw4pts@gw4p
19 *
20 * Changes
21 * Alan Cox :
22 * Maciej W. Rozycki :
23 */
24
25 #include <linux/module.h>
26 #include <linux/types.h>
27 #include <linux/kernel.h>
28 #include <linux/string.h>
29 #include <linux/mm.h>
30 #include <linux/socket.h>
31 #include <linux/in.h>
32 #include <linux/inet.h>
33 #include <linux/netdevice.h>
34 #include <linux/fddidevice.h>
35 #include <linux/if_ether.h>
36 #include <linux/skbuff.h>
37 #include <linux/errno.h>
38 #include <net/arp.h>
39 #include <net/sock.h>
40
41 /*
42 * Create the FDDI MAC header for an arbitrary
43 *
44 * saddr=NULL means use device source addres
45 * daddr=NULL means leave destination addres
46 */
47
48 static int fddi_header(struct sk_buff *skb, st
49 unsigned short type,
50 const void *daddr, cons
51 {
52 int hl = FDDI_K_SNAP_HLEN;
53 struct fddihdr *fddi;
54
55 if(type != ETH_P_IP && type != ETH_P_I
56 hl=FDDI_K_8022_HLEN-3;
57 fddi = skb_push(skb, hl);
58 fddi->fc = FDD
59 if(type == ETH_P_IP || type == ETH_P_I
60 {
61 fddi->hdr.llc_snap.dsap
62 fddi->hdr.llc_snap.ssap
63 fddi->hdr.llc_snap.ctrl
64 fddi->hdr.llc_snap.oui[0]
65 fddi->hdr.llc_snap.oui[1]
66 fddi->hdr.llc_snap.oui[2]
67 fddi->hdr.llc_snap.ethertype
68 }
69
70 /* Set the source and destination hard
71
72 if (saddr != NULL)
73 memcpy(fddi->saddr, saddr, dev
74 else
75 memcpy(fddi->saddr, dev->dev_a
76
77 if (daddr != NULL)
78 {
79 memcpy(fddi->daddr, daddr, dev
80 return hl;
81 }
82
83 return -hl;
84 }
85
86 /*
87 * Determine the packet's protocol ID and fill
88 * This routine is called before an incoming p
89 * up. It's used to fill in specific skb fiel
90 * the proper pointer to the start of packet d
91 */
92
93 __be16 fddi_type_trans(struct sk_buff *skb, st
94 {
95 struct fddihdr *fddi = (struct fddihdr
96 __be16 type;
97
98 /*
99 * Set mac.raw field to point to FC by
100 * to start of packet data. Assume 80
101 */
102
103 skb->dev = dev;
104 skb_reset_mac_header(skb); /* poi
105
106 if(fddi->hdr.llc_8022_1.dsap==0xe0)
107 {
108 skb_pull(skb, FDDI_K_8022_HLEN
109 type = htons(ETH_P_802_2);
110 }
111 else
112 {
113 skb_pull(skb, FDDI_K_SNAP_HLEN
114 type=fddi->hdr.llc_snap.ethert
115 }
116
117 /* Set packet type based on destinatio
118
119 if (*fddi->daddr & 0x01)
120 {
121 if (memcmp(fddi->daddr, dev->b
122 skb->pkt_type = PACKET
123 else
124 skb->pkt_type = PACKET
125 }
126
127 else if (dev->flags & IFF_PROMISC)
128 {
129 if (memcmp(fddi->daddr, dev->d
130 skb->pkt_type = PACKET
131 }
132
133 /* Assume 802.2 SNAP frames, for now *
134
135 return type;
136 }
137
138 EXPORT_SYMBOL(fddi_type_trans);
139
140 static const struct header_ops fddi_header_ops
141 .create = fddi_header,
142 };
143
144
145 static void fddi_setup(struct net_device *dev)
146 {
147 dev->header_ops = &fddi_header
148 dev->type = ARPHRD_FDDI;
149 dev->hard_header_len = FDDI_K_SNAP_
150 dev->mtu = FDDI_K_SNAP_
151 dev->min_mtu = FDDI_K_SNAP_
152 dev->max_mtu = FDDI_K_SNAP_
153 dev->addr_len = FDDI_K_ALEN;
154 dev->tx_queue_len = 100;
155 dev->flags = IFF_BROADCAS
156
157 memset(dev->broadcast, 0xFF, FDDI_K_AL
158 }
159
160 /**
161 * alloc_fddidev - Register FDDI device
162 * @sizeof_priv: Size of additional driver-pri
163 * for this FDDI device
164 *
165 * Fill in the fields of the device structure
166 *
167 * Constructs a new net device, complete with
168 * size @sizeof_priv. A 32-byte (not bit) ali
169 * this private data area.
170 */
171 struct net_device *alloc_fddidev(int sizeof_pr
172 {
173 return alloc_netdev(sizeof_priv, "fddi
174 fddi_setup);
175 }
176 EXPORT_SYMBOL(alloc_fddidev);
177
178 MODULE_DESCRIPTION("Core routines for FDDI net
179 MODULE_LICENSE("GPL");
180
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