1 // SPDX-License-Identifier: GPL-2.0-or-later <<
2 /* 1 /*
3 * INET An implementation of the TCP/I 2 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is imp 3 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of comm 4 * interface as the means of communication with the user level.
6 * 5 *
7 * FDDI-type device handling. 6 * FDDI-type device handling.
8 * 7 *
9 * Version: @(#)fddi.c 1.0.0 08/12/ 8 * Version: @(#)fddi.c 1.0.0 08/12/96
10 * 9 *
11 * Authors: Lawrence V. Stefani, <stefani@ 10 * Authors: Lawrence V. Stefani, <stefani@lkg.dec.com>
12 * 11 *
13 * fddi.c is based on previous et 12 * fddi.c is based on previous eth.c and tr.c work by
14 * Ross Biro 13 * Ross Biro
15 * Fred N. van Kempen, <w 14 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
16 * Mark Evans, <evansmp@u 15 * Mark Evans, <evansmp@uhura.aston.ac.uk>
17 * Florian La Roche, <rzs 16 * Florian La Roche, <rzsfl@rz.uni-sb.de>
18 * Alan Cox, <gw4pts@gw4p 17 * Alan Cox, <gw4pts@gw4pts.ampr.org>
19 * 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 *
20 * Changes 24 * Changes
21 * Alan Cox : 25 * Alan Cox : New arp/rebuild header
22 * Maciej W. Rozycki : 26 * Maciej W. Rozycki : IPv6 support
23 */ 27 */
24 28
25 #include <linux/module.h> 29 #include <linux/module.h>
26 #include <linux/types.h> 30 #include <linux/types.h>
27 #include <linux/kernel.h> 31 #include <linux/kernel.h>
28 #include <linux/string.h> 32 #include <linux/string.h>
29 #include <linux/mm.h> 33 #include <linux/mm.h>
30 #include <linux/socket.h> 34 #include <linux/socket.h>
31 #include <linux/in.h> 35 #include <linux/in.h>
32 #include <linux/inet.h> 36 #include <linux/inet.h>
33 #include <linux/netdevice.h> 37 #include <linux/netdevice.h>
34 #include <linux/fddidevice.h> 38 #include <linux/fddidevice.h>
35 #include <linux/if_ether.h> 39 #include <linux/if_ether.h>
36 #include <linux/skbuff.h> 40 #include <linux/skbuff.h>
37 #include <linux/errno.h> 41 #include <linux/errno.h>
38 #include <net/arp.h> 42 #include <net/arp.h>
39 #include <net/sock.h> 43 #include <net/sock.h>
40 44
41 /* 45 /*
42 * Create the FDDI MAC header for an arbitrary 46 * Create the FDDI MAC header for an arbitrary protocol layer
43 * 47 *
44 * saddr=NULL means use device source addres 48 * saddr=NULL means use device source address
45 * daddr=NULL means leave destination addres 49 * daddr=NULL means leave destination address (eg unresolved arp)
46 */ 50 */
47 51
48 static int fddi_header(struct sk_buff *skb, st 52 static int fddi_header(struct sk_buff *skb, struct net_device *dev,
49 unsigned short type, 53 unsigned short type,
50 const void *daddr, cons 54 const void *daddr, const void *saddr, unsigned int len)
51 { 55 {
52 int hl = FDDI_K_SNAP_HLEN; 56 int hl = FDDI_K_SNAP_HLEN;
53 struct fddihdr *fddi; 57 struct fddihdr *fddi;
54 58
55 if(type != ETH_P_IP && type != ETH_P_I 59 if(type != ETH_P_IP && type != ETH_P_IPV6 && type != ETH_P_ARP)
56 hl=FDDI_K_8022_HLEN-3; 60 hl=FDDI_K_8022_HLEN-3;
57 fddi = skb_push(skb, hl); 61 fddi = skb_push(skb, hl);
58 fddi->fc = FDD 62 fddi->fc = FDDI_FC_K_ASYNC_LLC_DEF;
59 if(type == ETH_P_IP || type == ETH_P_I 63 if(type == ETH_P_IP || type == ETH_P_IPV6 || type == ETH_P_ARP)
60 { 64 {
61 fddi->hdr.llc_snap.dsap 65 fddi->hdr.llc_snap.dsap = FDDI_EXTENDED_SAP;
62 fddi->hdr.llc_snap.ssap 66 fddi->hdr.llc_snap.ssap = FDDI_EXTENDED_SAP;
63 fddi->hdr.llc_snap.ctrl 67 fddi->hdr.llc_snap.ctrl = FDDI_UI_CMD;
64 fddi->hdr.llc_snap.oui[0] 68 fddi->hdr.llc_snap.oui[0] = 0x00;
65 fddi->hdr.llc_snap.oui[1] 69 fddi->hdr.llc_snap.oui[1] = 0x00;
66 fddi->hdr.llc_snap.oui[2] 70 fddi->hdr.llc_snap.oui[2] = 0x00;
67 fddi->hdr.llc_snap.ethertype 71 fddi->hdr.llc_snap.ethertype = htons(type);
68 } 72 }
69 73
70 /* Set the source and destination hard 74 /* Set the source and destination hardware addresses */
71 75
72 if (saddr != NULL) 76 if (saddr != NULL)
73 memcpy(fddi->saddr, saddr, dev 77 memcpy(fddi->saddr, saddr, dev->addr_len);
74 else 78 else
75 memcpy(fddi->saddr, dev->dev_a 79 memcpy(fddi->saddr, dev->dev_addr, dev->addr_len);
76 80
77 if (daddr != NULL) 81 if (daddr != NULL)
78 { 82 {
79 memcpy(fddi->daddr, daddr, dev 83 memcpy(fddi->daddr, daddr, dev->addr_len);
80 return hl; 84 return hl;
81 } 85 }
82 86
83 return -hl; 87 return -hl;
84 } 88 }
85 89
86 /* 90 /*
87 * Determine the packet's protocol ID and fill 91 * Determine the packet's protocol ID and fill in skb fields.
88 * This routine is called before an incoming p 92 * This routine is called before an incoming packet is passed
89 * up. It's used to fill in specific skb fiel 93 * up. It's used to fill in specific skb fields and to set
90 * the proper pointer to the start of packet d 94 * the proper pointer to the start of packet data (skb->data).
91 */ 95 */
92 96
93 __be16 fddi_type_trans(struct sk_buff *skb, st 97 __be16 fddi_type_trans(struct sk_buff *skb, struct net_device *dev)
94 { 98 {
95 struct fddihdr *fddi = (struct fddihdr 99 struct fddihdr *fddi = (struct fddihdr *)skb->data;
96 __be16 type; 100 __be16 type;
97 101
98 /* 102 /*
99 * Set mac.raw field to point to FC by 103 * Set mac.raw field to point to FC byte, set data field to point
100 * to start of packet data. Assume 80 104 * to start of packet data. Assume 802.2 SNAP frames for now.
101 */ 105 */
102 106
103 skb->dev = dev; 107 skb->dev = dev;
104 skb_reset_mac_header(skb); /* poi 108 skb_reset_mac_header(skb); /* point to frame control (FC) */
105 109
106 if(fddi->hdr.llc_8022_1.dsap==0xe0) 110 if(fddi->hdr.llc_8022_1.dsap==0xe0)
107 { 111 {
108 skb_pull(skb, FDDI_K_8022_HLEN 112 skb_pull(skb, FDDI_K_8022_HLEN-3);
109 type = htons(ETH_P_802_2); 113 type = htons(ETH_P_802_2);
110 } 114 }
111 else 115 else
112 { 116 {
113 skb_pull(skb, FDDI_K_SNAP_HLEN 117 skb_pull(skb, FDDI_K_SNAP_HLEN); /* adjust for 21 byte header */
114 type=fddi->hdr.llc_snap.ethert 118 type=fddi->hdr.llc_snap.ethertype;
115 } 119 }
116 120
117 /* Set packet type based on destinatio 121 /* Set packet type based on destination address and flag settings */
118 122
119 if (*fddi->daddr & 0x01) 123 if (*fddi->daddr & 0x01)
120 { 124 {
121 if (memcmp(fddi->daddr, dev->b 125 if (memcmp(fddi->daddr, dev->broadcast, FDDI_K_ALEN) == 0)
122 skb->pkt_type = PACKET 126 skb->pkt_type = PACKET_BROADCAST;
123 else 127 else
124 skb->pkt_type = PACKET 128 skb->pkt_type = PACKET_MULTICAST;
125 } 129 }
126 130
127 else if (dev->flags & IFF_PROMISC) 131 else if (dev->flags & IFF_PROMISC)
128 { 132 {
129 if (memcmp(fddi->daddr, dev->d 133 if (memcmp(fddi->daddr, dev->dev_addr, FDDI_K_ALEN))
130 skb->pkt_type = PACKET 134 skb->pkt_type = PACKET_OTHERHOST;
131 } 135 }
132 136
133 /* Assume 802.2 SNAP frames, for now * 137 /* Assume 802.2 SNAP frames, for now */
134 138
135 return type; 139 return type;
136 } 140 }
137 141
138 EXPORT_SYMBOL(fddi_type_trans); 142 EXPORT_SYMBOL(fddi_type_trans);
139 143
140 static const struct header_ops fddi_header_ops 144 static const struct header_ops fddi_header_ops = {
141 .create = fddi_header, 145 .create = fddi_header,
142 }; 146 };
143 147
144 148
145 static void fddi_setup(struct net_device *dev) 149 static void fddi_setup(struct net_device *dev)
146 { 150 {
147 dev->header_ops = &fddi_header 151 dev->header_ops = &fddi_header_ops;
148 dev->type = ARPHRD_FDDI; 152 dev->type = ARPHRD_FDDI;
149 dev->hard_header_len = FDDI_K_SNAP_ 153 dev->hard_header_len = FDDI_K_SNAP_HLEN+3; /* Assume 802.2 SNAP hdr len + 3 pad bytes */
150 dev->mtu = FDDI_K_SNAP_ 154 dev->mtu = FDDI_K_SNAP_DLEN; /* Assume max payload of 802.2 SNAP frame */
151 dev->min_mtu = FDDI_K_SNAP_ 155 dev->min_mtu = FDDI_K_SNAP_HLEN;
152 dev->max_mtu = FDDI_K_SNAP_ 156 dev->max_mtu = FDDI_K_SNAP_DLEN;
153 dev->addr_len = FDDI_K_ALEN; 157 dev->addr_len = FDDI_K_ALEN;
154 dev->tx_queue_len = 100; 158 dev->tx_queue_len = 100; /* Long queues on FDDI */
155 dev->flags = IFF_BROADCAS 159 dev->flags = IFF_BROADCAST | IFF_MULTICAST;
156 160
157 memset(dev->broadcast, 0xFF, FDDI_K_AL 161 memset(dev->broadcast, 0xFF, FDDI_K_ALEN);
158 } 162 }
159 163
160 /** 164 /**
161 * alloc_fddidev - Register FDDI device 165 * alloc_fddidev - Register FDDI device
162 * @sizeof_priv: Size of additional driver-pri 166 * @sizeof_priv: Size of additional driver-private structure to be allocated
163 * for this FDDI device 167 * for this FDDI device
164 * 168 *
165 * Fill in the fields of the device structure 169 * Fill in the fields of the device structure with FDDI-generic values.
166 * 170 *
167 * Constructs a new net device, complete with 171 * Constructs a new net device, complete with a private data area of
168 * size @sizeof_priv. A 32-byte (not bit) ali 172 * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
169 * this private data area. 173 * this private data area.
170 */ 174 */
171 struct net_device *alloc_fddidev(int sizeof_pr 175 struct net_device *alloc_fddidev(int sizeof_priv)
172 { 176 {
173 return alloc_netdev(sizeof_priv, "fddi 177 return alloc_netdev(sizeof_priv, "fddi%d", NET_NAME_UNKNOWN,
174 fddi_setup); 178 fddi_setup);
175 } 179 }
176 EXPORT_SYMBOL(alloc_fddidev); 180 EXPORT_SYMBOL(alloc_fddidev);
177 181
178 MODULE_DESCRIPTION("Core routines for FDDI net <<
179 MODULE_LICENSE("GPL"); 182 MODULE_LICENSE("GPL");
180 183
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