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1da177e4 LT |
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 | * HIPPI-type device handling. | |
7 | * | |
8 | * Version: @(#)hippi.c 1.0.0 05/29/97 | |
9 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * Mark Evans, <evansmp@uhura.aston.ac.uk> | |
13 | * Florian La Roche, <rzsfl@rz.uni-sb.de> | |
14 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
15 | * Jes Sorensen, <Jes.Sorensen@cern.ch> | |
16 | * | |
17 | * This program is free software; you can redistribute it and/or | |
18 | * modify it under the terms of the GNU General Public License | |
19 | * as published by the Free Software Foundation; either version | |
20 | * 2 of the License, or (at your option) any later version. | |
21 | */ | |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/types.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/sched.h> | |
27 | #include <linux/string.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/socket.h> | |
30 | #include <linux/in.h> | |
31 | #include <linux/inet.h> | |
32 | #include <linux/netdevice.h> | |
33 | #include <linux/hippidevice.h> | |
34 | #include <linux/skbuff.h> | |
35 | #include <linux/errno.h> | |
36 | #include <net/arp.h> | |
37 | #include <net/sock.h> | |
38 | #include <asm/uaccess.h> | |
1da177e4 LT |
39 | #include <asm/system.h> |
40 | ||
41 | /* | |
42 | * Create the HIPPI MAC header for an arbitrary protocol layer | |
43 | * | |
44 | * saddr=NULL means use device source address | |
45 | * daddr=NULL means leave destination address (eg unresolved arp) | |
46 | */ | |
47 | ||
48 | static int hippi_header(struct sk_buff *skb, struct net_device *dev, | |
49 | unsigned short type, void *daddr, void *saddr, | |
50 | unsigned len) | |
51 | { | |
52 | struct hippi_hdr *hip = (struct hippi_hdr *)skb_push(skb, HIPPI_HLEN); | |
6f1cf165 | 53 | struct hippi_cb *hcb = (struct hippi_cb *) skb->cb; |
1da177e4 LT |
54 | |
55 | if (!len){ | |
56 | len = skb->len - HIPPI_HLEN; | |
57 | printk("hippi_header(): length not supplied\n"); | |
58 | } | |
59 | ||
60 | /* | |
61 | * Due to the stupidity of the little endian byte-order we | |
62 | * have to set the fp field this way. | |
63 | */ | |
64 | hip->fp.fixed = __constant_htonl(0x04800018); | |
65 | hip->fp.d2_size = htonl(len + 8); | |
66 | hip->le.fc = 0; | |
67 | hip->le.double_wide = 0; /* only HIPPI 800 for the time being */ | |
68 | hip->le.message_type = 0; /* Data PDU */ | |
69 | ||
70 | hip->le.dest_addr_type = 2; /* 12 bit SC address */ | |
71 | hip->le.src_addr_type = 2; /* 12 bit SC address */ | |
72 | ||
73 | memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3); | |
74 | memset(&hip->le.reserved, 0, 16); | |
75 | ||
76 | hip->snap.dsap = HIPPI_EXTENDED_SAP; | |
77 | hip->snap.ssap = HIPPI_EXTENDED_SAP; | |
78 | hip->snap.ctrl = HIPPI_UI_CMD; | |
79 | hip->snap.oui[0] = 0x00; | |
80 | hip->snap.oui[1] = 0x00; | |
81 | hip->snap.oui[2] = 0x00; | |
82 | hip->snap.ethertype = htons(type); | |
83 | ||
84 | if (daddr) | |
85 | { | |
86 | memcpy(hip->le.dest_switch_addr, daddr + 3, 3); | |
6f1cf165 | 87 | memcpy(&hcb->ifield, daddr + 2, 4); |
1da177e4 LT |
88 | return HIPPI_HLEN; |
89 | } | |
6f1cf165 | 90 | hcb->ifield = 0; |
1da177e4 LT |
91 | return -((int)HIPPI_HLEN); |
92 | } | |
93 | ||
94 | ||
95 | /* | |
96 | * Rebuild the HIPPI MAC header. This is called after an ARP has | |
97 | * completed on this sk_buff. We now let ARP fill in the other fields. | |
98 | */ | |
99 | ||
100 | static int hippi_rebuild_header(struct sk_buff *skb) | |
101 | { | |
102 | struct hippi_hdr *hip = (struct hippi_hdr *)skb->data; | |
103 | ||
104 | /* | |
105 | * Only IP is currently supported | |
106 | */ | |
107 | ||
108 | if(hip->snap.ethertype != __constant_htons(ETH_P_IP)) | |
109 | { | |
110 | printk(KERN_DEBUG "%s: unable to resolve type %X addresses.\n",skb->dev->name,ntohs(hip->snap.ethertype)); | |
111 | return 0; | |
112 | } | |
113 | ||
114 | /* | |
115 | * We don't support dynamic ARP on HIPPI, but we use the ARP | |
116 | * static ARP tables to hold the I-FIELDs. | |
117 | */ | |
118 | return arp_find(hip->le.daddr, skb); | |
119 | } | |
120 | ||
121 | ||
122 | /* | |
123 | * Determine the packet's protocol ID. | |
124 | */ | |
125 | ||
57bf1451 | 126 | __be16 hippi_type_trans(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
127 | { |
128 | struct hippi_hdr *hip; | |
129 | ||
130 | hip = (struct hippi_hdr *) skb->data; | |
131 | ||
132 | /* | |
133 | * This is actually wrong ... question is if we really should | |
134 | * set the raw address here. | |
135 | */ | |
136 | skb->mac.raw = skb->data; | |
137 | skb_pull(skb, HIPPI_HLEN); | |
138 | ||
139 | /* | |
140 | * No fancy promisc stuff here now. | |
141 | */ | |
142 | ||
143 | return hip->snap.ethertype; | |
144 | } | |
145 | ||
146 | EXPORT_SYMBOL(hippi_type_trans); | |
147 | ||
148 | static int hippi_change_mtu(struct net_device *dev, int new_mtu) | |
149 | { | |
150 | /* | |
151 | * HIPPI's got these nice large MTUs. | |
152 | */ | |
153 | if ((new_mtu < 68) || (new_mtu > 65280)) | |
154 | return -EINVAL; | |
155 | dev->mtu = new_mtu; | |
156 | return(0); | |
157 | } | |
158 | ||
159 | /* | |
160 | * For HIPPI we will actually use the lower 4 bytes of the hardware | |
161 | * address as the I-FIELD rather than the actual hardware address. | |
162 | */ | |
163 | static int hippi_mac_addr(struct net_device *dev, void *p) | |
164 | { | |
165 | struct sockaddr *addr = p; | |
166 | if (netif_running(dev)) | |
167 | return -EBUSY; | |
168 | memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); | |
169 | return 0; | |
170 | } | |
171 | ||
172 | static int hippi_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p) | |
173 | { | |
174 | /* Never send broadcast/multicast ARP messages */ | |
175 | p->mcast_probes = 0; | |
176 | ||
177 | /* In IPv6 unicast probes are valid even on NBMA, | |
178 | * because they are encapsulated in normal IPv6 protocol. | |
179 | * Should be a generic flag. | |
180 | */ | |
181 | if (p->tbl->family != AF_INET6) | |
182 | p->ucast_probes = 0; | |
183 | return 0; | |
184 | } | |
185 | ||
186 | static void hippi_setup(struct net_device *dev) | |
187 | { | |
188 | dev->set_multicast_list = NULL; | |
189 | dev->change_mtu = hippi_change_mtu; | |
190 | dev->hard_header = hippi_header; | |
191 | dev->rebuild_header = hippi_rebuild_header; | |
192 | dev->set_mac_address = hippi_mac_addr; | |
193 | dev->hard_header_parse = NULL; | |
194 | dev->hard_header_cache = NULL; | |
195 | dev->header_cache_update = NULL; | |
196 | dev->neigh_setup = hippi_neigh_setup_dev; | |
197 | ||
198 | /* | |
199 | * We don't support HIPPI `ARP' for the time being, and probably | |
200 | * never will unless someone else implements it. However we | |
201 | * still need a fake ARPHRD to make ifconfig and friends play ball. | |
202 | */ | |
203 | dev->type = ARPHRD_HIPPI; | |
204 | dev->hard_header_len = HIPPI_HLEN; | |
205 | dev->mtu = 65280; | |
206 | dev->addr_len = HIPPI_ALEN; | |
207 | dev->tx_queue_len = 25 /* 5 */; | |
208 | memset(dev->broadcast, 0xFF, HIPPI_ALEN); | |
209 | ||
210 | ||
211 | /* | |
212 | * HIPPI doesn't support broadcast+multicast and we only use | |
213 | * static ARP tables. ARP is disabled by hippi_neigh_setup_dev. | |
214 | */ | |
215 | dev->flags = 0; | |
216 | } | |
217 | ||
218 | /** | |
219 | * alloc_hippi_dev - Register HIPPI device | |
220 | * @sizeof_priv: Size of additional driver-private structure to be allocated | |
221 | * for this HIPPI device | |
222 | * | |
223 | * Fill in the fields of the device structure with HIPPI-generic values. | |
224 | * | |
225 | * Constructs a new net device, complete with a private data area of | |
226 | * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for | |
227 | * this private data area. | |
228 | */ | |
229 | ||
230 | struct net_device *alloc_hippi_dev(int sizeof_priv) | |
231 | { | |
232 | return alloc_netdev(sizeof_priv, "hip%d", hippi_setup); | |
233 | } | |
234 | ||
235 | EXPORT_SYMBOL(alloc_hippi_dev); |