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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 | |
53 | static 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 | |
98 | static 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 | |
168 | EXPORT_SYMBOL(fddi_type_trans); |
169 | |
170 | int 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 | } |
177 | EXPORT_SYMBOL(fddi_change_mtu); |
178 | |
179 | static const struct header_ops fddi_header_ops = { |
180 | .create = fddi_header, |
181 | .rebuild = fddi_rebuild_header, |
182 | }; |
183 | |
184 | |
185 | static 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 | */ |
209 | struct net_device *alloc_fddidev(int sizeof_priv) |
210 | { |
211 | return alloc_netdev(sizeof_priv, "fddi%d", fddi_setup); |
212 | } |
213 | EXPORT_SYMBOL(alloc_fddidev); |
214 | |
215 | MODULE_LICENSE("GPL"); |
216 |
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