Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Jesper Juhl | 02c30a8 | 2005-05-05 16:16:16 -0700 | [diff] [blame] | 10 | * Authors: Ross Biro |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/string.h> |
| 27 | #include <linux/mm.h> |
| 28 | #include <linux/socket.h> |
| 29 | #include <linux/in.h> |
| 30 | #include <linux/inet.h> |
| 31 | #include <linux/netdevice.h> |
| 32 | #include <linux/hippidevice.h> |
| 33 | #include <linux/skbuff.h> |
| 34 | #include <linux/errno.h> |
| 35 | #include <net/arp.h> |
| 36 | #include <net/sock.h> |
Linus Torvalds | 7c0f6ba | 2016-12-24 11:46:01 -0800 | [diff] [blame] | 37 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | /* |
YOSHIFUJI Hideaki | 9afa094 | 2007-02-09 23:24:24 +0900 | [diff] [blame] | 40 | * Create the HIPPI MAC header for an arbitrary protocol layer |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | * |
| 42 | * saddr=NULL means use device source address |
| 43 | * daddr=NULL means leave destination address (eg unresolved arp) |
| 44 | */ |
| 45 | |
| 46 | static int hippi_header(struct sk_buff *skb, struct net_device *dev, |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 47 | unsigned short type, |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 48 | const void *daddr, const void *saddr, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | { |
Johannes Berg | d58ff35 | 2017-06-16 14:29:23 +0200 | [diff] [blame] | 50 | struct hippi_hdr *hip = skb_push(skb, HIPPI_HLEN); |
Stephen Hemminger | 6f1cf16 | 2005-08-09 19:31:17 -0700 | [diff] [blame] | 51 | struct hippi_cb *hcb = (struct hippi_cb *) skb->cb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
| 53 | if (!len){ |
| 54 | len = skb->len - HIPPI_HLEN; |
| 55 | printk("hippi_header(): length not supplied\n"); |
| 56 | } |
| 57 | |
| 58 | /* |
| 59 | * Due to the stupidity of the little endian byte-order we |
| 60 | * have to set the fp field this way. |
| 61 | */ |
YOSHIFUJI Hideaki | 2953fd2 | 2007-03-25 20:11:55 -0700 | [diff] [blame] | 62 | hip->fp.fixed = htonl(0x04800018); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | hip->fp.d2_size = htonl(len + 8); |
| 64 | hip->le.fc = 0; |
| 65 | hip->le.double_wide = 0; /* only HIPPI 800 for the time being */ |
| 66 | hip->le.message_type = 0; /* Data PDU */ |
| 67 | |
| 68 | hip->le.dest_addr_type = 2; /* 12 bit SC address */ |
| 69 | hip->le.src_addr_type = 2; /* 12 bit SC address */ |
| 70 | |
| 71 | memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3); |
| 72 | memset(&hip->le.reserved, 0, 16); |
| 73 | |
| 74 | hip->snap.dsap = HIPPI_EXTENDED_SAP; |
| 75 | hip->snap.ssap = HIPPI_EXTENDED_SAP; |
| 76 | hip->snap.ctrl = HIPPI_UI_CMD; |
| 77 | hip->snap.oui[0] = 0x00; |
| 78 | hip->snap.oui[1] = 0x00; |
| 79 | hip->snap.oui[2] = 0x00; |
| 80 | hip->snap.ethertype = htons(type); |
| 81 | |
| 82 | if (daddr) |
| 83 | { |
| 84 | memcpy(hip->le.dest_switch_addr, daddr + 3, 3); |
Stephen Hemminger | 6f1cf16 | 2005-08-09 19:31:17 -0700 | [diff] [blame] | 85 | memcpy(&hcb->ifield, daddr + 2, 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | return HIPPI_HLEN; |
| 87 | } |
Stephen Hemminger | 6f1cf16 | 2005-08-09 19:31:17 -0700 | [diff] [blame] | 88 | hcb->ifield = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | return -((int)HIPPI_HLEN); |
| 90 | } |
| 91 | |
| 92 | |
| 93 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | * Determine the packet's protocol ID. |
| 95 | */ |
YOSHIFUJI Hideaki | 9afa094 | 2007-02-09 23:24:24 +0900 | [diff] [blame] | 96 | |
Alexey Dobriyan | 57bf145 | 2005-08-25 16:06:19 -0700 | [diff] [blame] | 97 | __be16 hippi_type_trans(struct sk_buff *skb, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | { |
| 99 | struct hippi_hdr *hip; |
YOSHIFUJI Hideaki | 9afa094 | 2007-02-09 23:24:24 +0900 | [diff] [blame] | 100 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | /* |
| 102 | * This is actually wrong ... question is if we really should |
| 103 | * set the raw address here. |
| 104 | */ |
Arnaldo Carvalho de Melo | 0a4f23f | 2007-03-10 10:57:13 -0300 | [diff] [blame] | 105 | skb->dev = dev; |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 106 | skb_reset_mac_header(skb); |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 107 | hip = (struct hippi_hdr *)skb_mac_header(skb); |
Arnaldo Carvalho de Melo | 0a4f23f | 2007-03-10 10:57:13 -0300 | [diff] [blame] | 108 | skb_pull(skb, HIPPI_HLEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
| 110 | /* |
| 111 | * No fancy promisc stuff here now. |
| 112 | */ |
| 113 | |
| 114 | return hip->snap.ethertype; |
| 115 | } |
| 116 | |
| 117 | EXPORT_SYMBOL(hippi_type_trans); |
| 118 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | /* |
| 120 | * For HIPPI we will actually use the lower 4 bytes of the hardware |
| 121 | * address as the I-FIELD rather than the actual hardware address. |
| 122 | */ |
Stephen Hemminger | 748ff68 | 2008-11-20 20:32:15 -0800 | [diff] [blame] | 123 | int hippi_mac_addr(struct net_device *dev, void *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | { |
| 125 | struct sockaddr *addr = p; |
| 126 | if (netif_running(dev)) |
| 127 | return -EBUSY; |
| 128 | memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); |
| 129 | return 0; |
| 130 | } |
Stephen Hemminger | 748ff68 | 2008-11-20 20:32:15 -0800 | [diff] [blame] | 131 | EXPORT_SYMBOL(hippi_mac_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | |
Stephen Hemminger | 748ff68 | 2008-11-20 20:32:15 -0800 | [diff] [blame] | 133 | int hippi_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | { |
| 135 | /* Never send broadcast/multicast ARP messages */ |
Jiri Pirko | 89740ca | 2014-01-09 14:13:47 +0100 | [diff] [blame] | 136 | NEIGH_VAR_INIT(p, MCAST_PROBES, 0); |
YOSHIFUJI Hideaki | 9afa094 | 2007-02-09 23:24:24 +0900 | [diff] [blame] | 137 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | /* In IPv6 unicast probes are valid even on NBMA, |
| 139 | * because they are encapsulated in normal IPv6 protocol. |
YOSHIFUJI Hideaki | 9afa094 | 2007-02-09 23:24:24 +0900 | [diff] [blame] | 140 | * Should be a generic flag. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | */ |
| 142 | if (p->tbl->family != AF_INET6) |
Jiri Pirko | 89740ca | 2014-01-09 14:13:47 +0100 | [diff] [blame] | 143 | NEIGH_VAR_INIT(p, UCAST_PROBES, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | return 0; |
| 145 | } |
Stephen Hemminger | 748ff68 | 2008-11-20 20:32:15 -0800 | [diff] [blame] | 146 | EXPORT_SYMBOL(hippi_neigh_setup_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 148 | static const struct header_ops hippi_header_ops = { |
| 149 | .create = hippi_header, |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 150 | }; |
| 151 | |
| 152 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | static void hippi_setup(struct net_device *dev) |
| 154 | { |
Stephen Hemminger | 748ff68 | 2008-11-20 20:32:15 -0800 | [diff] [blame] | 155 | dev->header_ops = &hippi_header_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | |
| 157 | /* |
| 158 | * We don't support HIPPI `ARP' for the time being, and probably |
| 159 | * never will unless someone else implements it. However we |
| 160 | * still need a fake ARPHRD to make ifconfig and friends play ball. |
| 161 | */ |
| 162 | dev->type = ARPHRD_HIPPI; |
| 163 | dev->hard_header_len = HIPPI_HLEN; |
| 164 | dev->mtu = 65280; |
Jarod Wilson | b3e3893 | 2016-10-20 13:55:22 -0400 | [diff] [blame] | 165 | dev->min_mtu = 68; |
| 166 | dev->max_mtu = 65280; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | dev->addr_len = HIPPI_ALEN; |
| 168 | dev->tx_queue_len = 25 /* 5 */; |
| 169 | memset(dev->broadcast, 0xFF, HIPPI_ALEN); |
| 170 | |
| 171 | |
| 172 | /* |
| 173 | * HIPPI doesn't support broadcast+multicast and we only use |
YOSHIFUJI Hideaki | 9afa094 | 2007-02-09 23:24:24 +0900 | [diff] [blame] | 174 | * static ARP tables. ARP is disabled by hippi_neigh_setup_dev. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | */ |
YOSHIFUJI Hideaki | 9afa094 | 2007-02-09 23:24:24 +0900 | [diff] [blame] | 176 | dev->flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | } |
| 178 | |
| 179 | /** |
| 180 | * alloc_hippi_dev - Register HIPPI device |
| 181 | * @sizeof_priv: Size of additional driver-private structure to be allocated |
| 182 | * for this HIPPI device |
| 183 | * |
| 184 | * Fill in the fields of the device structure with HIPPI-generic values. |
| 185 | * |
| 186 | * Constructs a new net device, complete with a private data area of |
| 187 | * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for |
| 188 | * this private data area. |
| 189 | */ |
| 190 | |
| 191 | struct net_device *alloc_hippi_dev(int sizeof_priv) |
| 192 | { |
Tom Gundersen | c835a67 | 2014-07-14 16:37:24 +0200 | [diff] [blame] | 193 | return alloc_netdev(sizeof_priv, "hip%d", NET_NAME_UNKNOWN, |
| 194 | hippi_setup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | } |
| 196 | |
| 197 | EXPORT_SYMBOL(alloc_hippi_dev); |