1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
4 | * operating system. INET is implemented using the BSD Socket |
5 | * interface as the means of communication with the user level. |
6 | * |
7 | * HIPPI-type device handling. |
8 | * |
9 | * Version: @(#)hippi.c 1.0.0 05/29/97 |
10 | * |
11 | * Authors: Ross Biro |
12 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
13 | * Mark Evans, <evansmp@uhura.aston.ac.uk> |
14 | * Florian La Roche, <rzsfl@rz.uni-sb.de> |
15 | * Alan Cox, <gw4pts@gw4pts.ampr.org> |
16 | * Jes Sorensen, <Jes.Sorensen@cern.ch> |
17 | */ |
18 | |
19 | #include <linux/module.h> |
20 | #include <linux/types.h> |
21 | #include <linux/kernel.h> |
22 | #include <linux/string.h> |
23 | #include <linux/mm.h> |
24 | #include <linux/socket.h> |
25 | #include <linux/in.h> |
26 | #include <linux/inet.h> |
27 | #include <linux/netdevice.h> |
28 | #include <linux/hippidevice.h> |
29 | #include <linux/skbuff.h> |
30 | #include <linux/errno.h> |
31 | #include <net/arp.h> |
32 | #include <net/sock.h> |
33 | #include <linux/uaccess.h> |
34 | |
35 | /* |
36 | * Create the HIPPI MAC header for an arbitrary protocol layer |
37 | * |
38 | * saddr=NULL means use device source address |
39 | * daddr=NULL means leave destination address (eg unresolved arp) |
40 | */ |
41 | |
42 | static int (struct sk_buff *skb, struct net_device *dev, |
43 | unsigned short type, |
44 | const void *daddr, const void *saddr, unsigned int len) |
45 | { |
46 | struct hippi_hdr *hip = skb_push(skb, HIPPI_HLEN); |
47 | struct hippi_cb *hcb = (struct hippi_cb *) skb->cb; |
48 | |
49 | if (!len){ |
50 | len = skb->len - HIPPI_HLEN; |
51 | printk("hippi_header(): length not supplied\n" ); |
52 | } |
53 | |
54 | /* |
55 | * Due to the stupidity of the little endian byte-order we |
56 | * have to set the fp field this way. |
57 | */ |
58 | hip->fp.fixed = htonl(0x04800018); |
59 | hip->fp.d2_size = htonl(len + 8); |
60 | hip->le.fc = 0; |
61 | hip->le.double_wide = 0; /* only HIPPI 800 for the time being */ |
62 | hip->le.message_type = 0; /* Data PDU */ |
63 | |
64 | hip->le.dest_addr_type = 2; /* 12 bit SC address */ |
65 | hip->le.src_addr_type = 2; /* 12 bit SC address */ |
66 | |
67 | memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3); |
68 | memset_startat(&hip->le, 0, reserved); |
69 | |
70 | hip->snap.dsap = HIPPI_EXTENDED_SAP; |
71 | hip->snap.ssap = HIPPI_EXTENDED_SAP; |
72 | hip->snap.ctrl = HIPPI_UI_CMD; |
73 | hip->snap.oui[0] = 0x00; |
74 | hip->snap.oui[1] = 0x00; |
75 | hip->snap.oui[2] = 0x00; |
76 | hip->snap.ethertype = htons(type); |
77 | |
78 | if (daddr) |
79 | { |
80 | memcpy(hip->le.dest_switch_addr, daddr + 3, 3); |
81 | memcpy(&hcb->ifield, daddr + 2, 4); |
82 | return HIPPI_HLEN; |
83 | } |
84 | hcb->ifield = 0; |
85 | return -((int)HIPPI_HLEN); |
86 | } |
87 | |
88 | |
89 | /* |
90 | * Determine the packet's protocol ID. |
91 | */ |
92 | |
93 | __be16 hippi_type_trans(struct sk_buff *skb, struct net_device *dev) |
94 | { |
95 | struct hippi_hdr *hip; |
96 | |
97 | /* |
98 | * This is actually wrong ... question is if we really should |
99 | * set the raw address here. |
100 | */ |
101 | skb->dev = dev; |
102 | skb_reset_mac_header(skb); |
103 | hip = (struct hippi_hdr *)skb_mac_header(skb); |
104 | skb_pull(skb, HIPPI_HLEN); |
105 | |
106 | /* |
107 | * No fancy promisc stuff here now. |
108 | */ |
109 | |
110 | return hip->snap.ethertype; |
111 | } |
112 | |
113 | EXPORT_SYMBOL(hippi_type_trans); |
114 | |
115 | /* |
116 | * For HIPPI we will actually use the lower 4 bytes of the hardware |
117 | * address as the I-FIELD rather than the actual hardware address. |
118 | */ |
119 | int hippi_mac_addr(struct net_device *dev, void *p) |
120 | { |
121 | struct sockaddr *addr = p; |
122 | if (netif_running(dev)) |
123 | return -EBUSY; |
124 | dev_addr_set(dev, addr: addr->sa_data); |
125 | return 0; |
126 | } |
127 | EXPORT_SYMBOL(hippi_mac_addr); |
128 | |
129 | int hippi_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p) |
130 | { |
131 | /* Never send broadcast/multicast ARP messages */ |
132 | NEIGH_VAR_INIT(p, MCAST_PROBES, 0); |
133 | |
134 | /* In IPv6 unicast probes are valid even on NBMA, |
135 | * because they are encapsulated in normal IPv6 protocol. |
136 | * Should be a generic flag. |
137 | */ |
138 | if (p->tbl->family != AF_INET6) |
139 | NEIGH_VAR_INIT(p, UCAST_PROBES, 0); |
140 | return 0; |
141 | } |
142 | EXPORT_SYMBOL(hippi_neigh_setup_dev); |
143 | |
144 | static const struct header_ops = { |
145 | .create = hippi_header, |
146 | }; |
147 | |
148 | |
149 | static void hippi_setup(struct net_device *dev) |
150 | { |
151 | dev->header_ops = &hippi_header_ops; |
152 | |
153 | /* |
154 | * We don't support HIPPI `ARP' for the time being, and probably |
155 | * never will unless someone else implements it. However we |
156 | * still need a fake ARPHRD to make ifconfig and friends play ball. |
157 | */ |
158 | dev->type = ARPHRD_HIPPI; |
159 | dev->hard_header_len = HIPPI_HLEN; |
160 | dev->mtu = 65280; |
161 | dev->min_mtu = 68; |
162 | dev->max_mtu = 65280; |
163 | dev->addr_len = HIPPI_ALEN; |
164 | dev->tx_queue_len = 25 /* 5 */; |
165 | memset(dev->broadcast, 0xFF, HIPPI_ALEN); |
166 | |
167 | |
168 | /* |
169 | * HIPPI doesn't support broadcast+multicast and we only use |
170 | * static ARP tables. ARP is disabled by hippi_neigh_setup_dev. |
171 | */ |
172 | dev->flags = 0; |
173 | } |
174 | |
175 | /** |
176 | * alloc_hippi_dev - Register HIPPI device |
177 | * @sizeof_priv: Size of additional driver-private structure to be allocated |
178 | * for this HIPPI device |
179 | * |
180 | * Fill in the fields of the device structure with HIPPI-generic values. |
181 | * |
182 | * Constructs a new net device, complete with a private data area of |
183 | * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for |
184 | * this private data area. |
185 | */ |
186 | |
187 | struct net_device *alloc_hippi_dev(int sizeof_priv) |
188 | { |
189 | return alloc_netdev(sizeof_priv, "hip%d" , NET_NAME_UNKNOWN, |
190 | hippi_setup); |
191 | } |
192 | |
193 | EXPORT_SYMBOL(alloc_hippi_dev); |
194 | |