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1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * FDDI-type device handling.
7 *
8 * Version: @(#)fddi.c 1.0.0 08/12/96
9 *
10 * Authors: Lawrence V. Stefani, <stefani@lkg.dec.com>
11 *
12 * fddi.c is based on previous eth.c and tr.c work by
13 * Ross Biro
14 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
15 * Mark Evans, <evansmp@uhura.aston.ac.uk>
16 * Florian La Roche, <rzsfl@rz.uni-sb.de>
17 * Alan Cox, <gw4pts@gw4pts.ampr.org>
18 *
19 * This program is free software; you can redistribute it and/or
20 * modify it under the terms of the GNU General Public License
21 * as published by the Free Software Foundation; either version
22 * 2 of the License, or (at your option) any later version.
23 *
24 * Changes
25 * Alan Cox : New arp/rebuild header
26 * Maciej W. Rozycki : IPv6 support
27 */
28
29#include <linux/module.h>
30#include <asm/system.h>
31#include <linux/types.h>
32#include <linux/kernel.h>
33#include <linux/string.h>
34#include <linux/mm.h>
35#include <linux/socket.h>
36#include <linux/in.h>
37#include <linux/inet.h>
38#include <linux/netdevice.h>
39#include <linux/fddidevice.h>
40#include <linux/if_ether.h>
41#include <linux/skbuff.h>
42#include <linux/errno.h>
43#include <net/arp.h>
44#include <net/sock.h>
45
46/*
47 * Create the FDDI MAC header for an arbitrary protocol layer
48 *
49 * saddr=NULL means use device source address
50 * daddr=NULL means leave destination address (eg unresolved arp)
51 */
52
53static int fddi_header(struct sk_buff *skb, struct net_device *dev,
54 unsigned short type,
55 const void *daddr, const void *saddr, unsigned len)
56{
57 int hl = FDDI_K_SNAP_HLEN;
58 struct fddihdr *fddi;
59
60 if(type != ETH_P_IP && type != ETH_P_IPV6 && type != ETH_P_ARP)
61 hl=FDDI_K_8022_HLEN-3;
62 fddi = (struct fddihdr *)skb_push(skb, hl);
63 fddi->fc = FDDI_FC_K_ASYNC_LLC_DEF;
64 if(type == ETH_P_IP || type == ETH_P_IPV6 || type == ETH_P_ARP)
65 {
66 fddi->hdr.llc_snap.dsap = FDDI_EXTENDED_SAP;
67 fddi->hdr.llc_snap.ssap = FDDI_EXTENDED_SAP;
68 fddi->hdr.llc_snap.ctrl = FDDI_UI_CMD;
69 fddi->hdr.llc_snap.oui[0] = 0x00;
70 fddi->hdr.llc_snap.oui[1] = 0x00;
71 fddi->hdr.llc_snap.oui[2] = 0x00;
72 fddi->hdr.llc_snap.ethertype = htons(type);
73 }
74
75 /* Set the source and destination hardware addresses */
76
77 if (saddr != NULL)
78 memcpy(fddi->saddr, saddr, dev->addr_len);
79 else
80 memcpy(fddi->saddr, dev->dev_addr, dev->addr_len);
81
82 if (daddr != NULL)
83 {
84 memcpy(fddi->daddr, daddr, dev->addr_len);
85 return hl;
86 }
87
88 return -hl;
89}
90
91
92/*
93 * Rebuild the FDDI MAC header. This is called after an ARP
94 * (or in future other address resolution) has completed on
95 * this sk_buff. We now let ARP fill in the other fields.
96 */
97
98static int fddi_rebuild_header(struct sk_buff *skb)
99{
100 struct fddihdr *fddi = (struct fddihdr *)skb->data;
101
102#ifdef CONFIG_INET
103 if (fddi->hdr.llc_snap.ethertype == htons(ETH_P_IP))
104 /* Try to get ARP to resolve the header and fill destination address */
105 return arp_find(fddi->daddr, skb);
106 else
107#endif
108 {
109 printk("%s: Don't know how to resolve type %04X addresses.\n",
110 skb->dev->name, ntohs(fddi->hdr.llc_snap.ethertype));
111 return 0;
112 }
113}
114
115
116/*
117 * Determine the packet's protocol ID and fill in skb fields.
118 * This routine is called before an incoming packet is passed
119 * up. It's used to fill in specific skb fields and to set
120 * the proper pointer to the start of packet data (skb->data).
121 */
122
123__be16 fddi_type_trans(struct sk_buff *skb, struct net_device *dev)
124{
125 struct fddihdr *fddi = (struct fddihdr *)skb->data;
126 __be16 type;
127
128 /*
129 * Set mac.raw field to point to FC byte, set data field to point
130 * to start of packet data. Assume 802.2 SNAP frames for now.
131 */
132
133 skb->dev = dev;
134 skb_reset_mac_header(skb); /* point to frame control (FC) */
135
136 if(fddi->hdr.llc_8022_1.dsap==0xe0)
137 {
138 skb_pull(skb, FDDI_K_8022_HLEN-3);
139 type = htons(ETH_P_802_2);
140 }
141 else
142 {
143 skb_pull(skb, FDDI_K_SNAP_HLEN); /* adjust for 21 byte header */
144 type=fddi->hdr.llc_snap.ethertype;
145 }
146
147 /* Set packet type based on destination address and flag settings */
148
149 if (*fddi->daddr & 0x01)
150 {
151 if (memcmp(fddi->daddr, dev->broadcast, FDDI_K_ALEN) == 0)
152 skb->pkt_type = PACKET_BROADCAST;
153 else
154 skb->pkt_type = PACKET_MULTICAST;
155 }
156
157 else if (dev->flags & IFF_PROMISC)
158 {
159 if (memcmp(fddi->daddr, dev->dev_addr, FDDI_K_ALEN))
160 skb->pkt_type = PACKET_OTHERHOST;
161 }
162
163 /* Assume 802.2 SNAP frames, for now */
164
165 return type;
166}
167
168EXPORT_SYMBOL(fddi_type_trans);
169
170int fddi_change_mtu(struct net_device *dev, int new_mtu)
171{
172 if ((new_mtu < FDDI_K_SNAP_HLEN) || (new_mtu > FDDI_K_SNAP_DLEN))
173 return -EINVAL;
174 dev->mtu = new_mtu;
175 return 0;
176}
177EXPORT_SYMBOL(fddi_change_mtu);
178
179static const struct header_ops fddi_header_ops = {
180 .create = fddi_header,
181 .rebuild = fddi_rebuild_header,
182};
183
184
185static void fddi_setup(struct net_device *dev)
186{
187 dev->header_ops = &fddi_header_ops;
188 dev->type = ARPHRD_FDDI;
189 dev->hard_header_len = FDDI_K_SNAP_HLEN+3; /* Assume 802.2 SNAP hdr len + 3 pad bytes */
190 dev->mtu = FDDI_K_SNAP_DLEN; /* Assume max payload of 802.2 SNAP frame */
191 dev->addr_len = FDDI_K_ALEN;
192 dev->tx_queue_len = 100; /* Long queues on FDDI */
193 dev->flags = IFF_BROADCAST | IFF_MULTICAST;
194
195 memset(dev->broadcast, 0xFF, FDDI_K_ALEN);
196}
197
198/**
199 * alloc_fddidev - Register FDDI device
200 * @sizeof_priv: Size of additional driver-private structure to be allocated
201 * for this FDDI device
202 *
203 * Fill in the fields of the device structure with FDDI-generic values.
204 *
205 * Constructs a new net device, complete with a private data area of
206 * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
207 * this private data area.
208 */
209struct net_device *alloc_fddidev(int sizeof_priv)
210{
211 return alloc_netdev(sizeof_priv, "fddi%d", fddi_setup);
212}
213EXPORT_SYMBOL(alloc_fddidev);
214
215MODULE_LICENSE("GPL");
1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * FDDI-type device handling.
7 *
8 * Version: @(#)fddi.c 1.0.0 08/12/96
9 *
10 * Authors: Lawrence V. Stefani, <stefani@lkg.dec.com>
11 *
12 * fddi.c is based on previous eth.c and tr.c work by
13 * Ross Biro
14 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
15 * Mark Evans, <evansmp@uhura.aston.ac.uk>
16 * Florian La Roche, <rzsfl@rz.uni-sb.de>
17 * Alan Cox, <gw4pts@gw4pts.ampr.org>
18 *
19 * This program is free software; you can redistribute it and/or
20 * modify it under the terms of the GNU General Public License
21 * as published by the Free Software Foundation; either version
22 * 2 of the License, or (at your option) any later version.
23 *
24 * Changes
25 * Alan Cox : New arp/rebuild header
26 * Maciej W. Rozycki : IPv6 support
27 */
28
29#include <linux/module.h>
30#include <linux/types.h>
31#include <linux/kernel.h>
32#include <linux/string.h>
33#include <linux/mm.h>
34#include <linux/socket.h>
35#include <linux/in.h>
36#include <linux/inet.h>
37#include <linux/netdevice.h>
38#include <linux/fddidevice.h>
39#include <linux/if_ether.h>
40#include <linux/skbuff.h>
41#include <linux/errno.h>
42#include <net/arp.h>
43#include <net/sock.h>
44
45/*
46 * Create the FDDI MAC header for an arbitrary protocol layer
47 *
48 * saddr=NULL means use device source address
49 * daddr=NULL means leave destination address (eg unresolved arp)
50 */
51
52static int fddi_header(struct sk_buff *skb, struct net_device *dev,
53 unsigned short type,
54 const void *daddr, const void *saddr, unsigned int len)
55{
56 int hl = FDDI_K_SNAP_HLEN;
57 struct fddihdr *fddi;
58
59 if(type != ETH_P_IP && type != ETH_P_IPV6 && type != ETH_P_ARP)
60 hl=FDDI_K_8022_HLEN-3;
61 fddi = (struct fddihdr *)skb_push(skb, hl);
62 fddi->fc = FDDI_FC_K_ASYNC_LLC_DEF;
63 if(type == ETH_P_IP || type == ETH_P_IPV6 || type == ETH_P_ARP)
64 {
65 fddi->hdr.llc_snap.dsap = FDDI_EXTENDED_SAP;
66 fddi->hdr.llc_snap.ssap = FDDI_EXTENDED_SAP;
67 fddi->hdr.llc_snap.ctrl = FDDI_UI_CMD;
68 fddi->hdr.llc_snap.oui[0] = 0x00;
69 fddi->hdr.llc_snap.oui[1] = 0x00;
70 fddi->hdr.llc_snap.oui[2] = 0x00;
71 fddi->hdr.llc_snap.ethertype = htons(type);
72 }
73
74 /* Set the source and destination hardware addresses */
75
76 if (saddr != NULL)
77 memcpy(fddi->saddr, saddr, dev->addr_len);
78 else
79 memcpy(fddi->saddr, dev->dev_addr, dev->addr_len);
80
81 if (daddr != NULL)
82 {
83 memcpy(fddi->daddr, daddr, dev->addr_len);
84 return hl;
85 }
86
87 return -hl;
88}
89
90/*
91 * Determine the packet's protocol ID and fill in skb fields.
92 * This routine is called before an incoming packet is passed
93 * up. It's used to fill in specific skb fields and to set
94 * the proper pointer to the start of packet data (skb->data).
95 */
96
97__be16 fddi_type_trans(struct sk_buff *skb, struct net_device *dev)
98{
99 struct fddihdr *fddi = (struct fddihdr *)skb->data;
100 __be16 type;
101
102 /*
103 * Set mac.raw field to point to FC byte, set data field to point
104 * to start of packet data. Assume 802.2 SNAP frames for now.
105 */
106
107 skb->dev = dev;
108 skb_reset_mac_header(skb); /* point to frame control (FC) */
109
110 if(fddi->hdr.llc_8022_1.dsap==0xe0)
111 {
112 skb_pull(skb, FDDI_K_8022_HLEN-3);
113 type = htons(ETH_P_802_2);
114 }
115 else
116 {
117 skb_pull(skb, FDDI_K_SNAP_HLEN); /* adjust for 21 byte header */
118 type=fddi->hdr.llc_snap.ethertype;
119 }
120
121 /* Set packet type based on destination address and flag settings */
122
123 if (*fddi->daddr & 0x01)
124 {
125 if (memcmp(fddi->daddr, dev->broadcast, FDDI_K_ALEN) == 0)
126 skb->pkt_type = PACKET_BROADCAST;
127 else
128 skb->pkt_type = PACKET_MULTICAST;
129 }
130
131 else if (dev->flags & IFF_PROMISC)
132 {
133 if (memcmp(fddi->daddr, dev->dev_addr, FDDI_K_ALEN))
134 skb->pkt_type = PACKET_OTHERHOST;
135 }
136
137 /* Assume 802.2 SNAP frames, for now */
138
139 return type;
140}
141
142EXPORT_SYMBOL(fddi_type_trans);
143
144static const struct header_ops fddi_header_ops = {
145 .create = fddi_header,
146};
147
148
149static void fddi_setup(struct net_device *dev)
150{
151 dev->header_ops = &fddi_header_ops;
152 dev->type = ARPHRD_FDDI;
153 dev->hard_header_len = FDDI_K_SNAP_HLEN+3; /* Assume 802.2 SNAP hdr len + 3 pad bytes */
154 dev->mtu = FDDI_K_SNAP_DLEN; /* Assume max payload of 802.2 SNAP frame */
155 dev->min_mtu = FDDI_K_SNAP_HLEN;
156 dev->max_mtu = FDDI_K_SNAP_DLEN;
157 dev->addr_len = FDDI_K_ALEN;
158 dev->tx_queue_len = 100; /* Long queues on FDDI */
159 dev->flags = IFF_BROADCAST | IFF_MULTICAST;
160
161 memset(dev->broadcast, 0xFF, FDDI_K_ALEN);
162}
163
164/**
165 * alloc_fddidev - Register FDDI device
166 * @sizeof_priv: Size of additional driver-private structure to be allocated
167 * for this FDDI device
168 *
169 * Fill in the fields of the device structure with FDDI-generic values.
170 *
171 * Constructs a new net device, complete with a private data area of
172 * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
173 * this private data area.
174 */
175struct net_device *alloc_fddidev(int sizeof_priv)
176{
177 return alloc_netdev(sizeof_priv, "fddi%d", NET_NAME_UNKNOWN,
178 fddi_setup);
179}
180EXPORT_SYMBOL(alloc_fddidev);
181
182MODULE_LICENSE("GPL");