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> |
| 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> |
| 39 | #include <asm/checksum.h> |
| 40 | #include <asm/system.h> |
| 41 | |
| 42 | /* |
| 43 | * Create the HIPPI MAC header for an arbitrary protocol layer |
| 44 | * |
| 45 | * saddr=NULL means use device source address |
| 46 | * daddr=NULL means leave destination address (eg unresolved arp) |
| 47 | */ |
| 48 | |
| 49 | static int hippi_header(struct sk_buff *skb, struct net_device *dev, |
| 50 | unsigned short type, void *daddr, void *saddr, |
| 51 | unsigned len) |
| 52 | { |
| 53 | struct hippi_hdr *hip = (struct hippi_hdr *)skb_push(skb, HIPPI_HLEN); |
| 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); |
| 87 | memcpy(&skb->private.ifield, daddr + 2, 4); |
| 88 | return HIPPI_HLEN; |
| 89 | } |
| 90 | return -((int)HIPPI_HLEN); |
| 91 | } |
| 92 | |
| 93 | |
| 94 | /* |
| 95 | * Rebuild the HIPPI MAC header. This is called after an ARP has |
| 96 | * completed on this sk_buff. We now let ARP fill in the other fields. |
| 97 | */ |
| 98 | |
| 99 | static int hippi_rebuild_header(struct sk_buff *skb) |
| 100 | { |
| 101 | struct hippi_hdr *hip = (struct hippi_hdr *)skb->data; |
| 102 | |
| 103 | /* |
| 104 | * Only IP is currently supported |
| 105 | */ |
| 106 | |
| 107 | if(hip->snap.ethertype != __constant_htons(ETH_P_IP)) |
| 108 | { |
| 109 | printk(KERN_DEBUG "%s: unable to resolve type %X addresses.\n",skb->dev->name,ntohs(hip->snap.ethertype)); |
| 110 | return 0; |
| 111 | } |
| 112 | |
| 113 | /* |
| 114 | * We don't support dynamic ARP on HIPPI, but we use the ARP |
| 115 | * static ARP tables to hold the I-FIELDs. |
| 116 | */ |
| 117 | return arp_find(hip->le.daddr, skb); |
| 118 | } |
| 119 | |
| 120 | |
| 121 | /* |
| 122 | * Determine the packet's protocol ID. |
| 123 | */ |
| 124 | |
| 125 | unsigned short hippi_type_trans(struct sk_buff *skb, struct net_device *dev) |
| 126 | { |
| 127 | struct hippi_hdr *hip; |
| 128 | |
| 129 | hip = (struct hippi_hdr *) skb->data; |
| 130 | |
| 131 | /* |
| 132 | * This is actually wrong ... question is if we really should |
| 133 | * set the raw address here. |
| 134 | */ |
| 135 | skb->mac.raw = skb->data; |
| 136 | skb_pull(skb, HIPPI_HLEN); |
| 137 | |
| 138 | /* |
| 139 | * No fancy promisc stuff here now. |
| 140 | */ |
| 141 | |
| 142 | return hip->snap.ethertype; |
| 143 | } |
| 144 | |
| 145 | EXPORT_SYMBOL(hippi_type_trans); |
| 146 | |
| 147 | static int hippi_change_mtu(struct net_device *dev, int new_mtu) |
| 148 | { |
| 149 | /* |
| 150 | * HIPPI's got these nice large MTUs. |
| 151 | */ |
| 152 | if ((new_mtu < 68) || (new_mtu > 65280)) |
| 153 | return -EINVAL; |
| 154 | dev->mtu = new_mtu; |
| 155 | return(0); |
| 156 | } |
| 157 | |
| 158 | /* |
| 159 | * For HIPPI we will actually use the lower 4 bytes of the hardware |
| 160 | * address as the I-FIELD rather than the actual hardware address. |
| 161 | */ |
| 162 | static int hippi_mac_addr(struct net_device *dev, void *p) |
| 163 | { |
| 164 | struct sockaddr *addr = p; |
| 165 | if (netif_running(dev)) |
| 166 | return -EBUSY; |
| 167 | memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); |
| 168 | return 0; |
| 169 | } |
| 170 | |
| 171 | static int hippi_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p) |
| 172 | { |
| 173 | /* Never send broadcast/multicast ARP messages */ |
| 174 | p->mcast_probes = 0; |
| 175 | |
| 176 | /* In IPv6 unicast probes are valid even on NBMA, |
| 177 | * because they are encapsulated in normal IPv6 protocol. |
| 178 | * Should be a generic flag. |
| 179 | */ |
| 180 | if (p->tbl->family != AF_INET6) |
| 181 | p->ucast_probes = 0; |
| 182 | return 0; |
| 183 | } |
| 184 | |
| 185 | static void hippi_setup(struct net_device *dev) |
| 186 | { |
| 187 | dev->set_multicast_list = NULL; |
| 188 | dev->change_mtu = hippi_change_mtu; |
| 189 | dev->hard_header = hippi_header; |
| 190 | dev->rebuild_header = hippi_rebuild_header; |
| 191 | dev->set_mac_address = hippi_mac_addr; |
| 192 | dev->hard_header_parse = NULL; |
| 193 | dev->hard_header_cache = NULL; |
| 194 | dev->header_cache_update = NULL; |
| 195 | dev->neigh_setup = hippi_neigh_setup_dev; |
| 196 | |
| 197 | /* |
| 198 | * We don't support HIPPI `ARP' for the time being, and probably |
| 199 | * never will unless someone else implements it. However we |
| 200 | * still need a fake ARPHRD to make ifconfig and friends play ball. |
| 201 | */ |
| 202 | dev->type = ARPHRD_HIPPI; |
| 203 | dev->hard_header_len = HIPPI_HLEN; |
| 204 | dev->mtu = 65280; |
| 205 | dev->addr_len = HIPPI_ALEN; |
| 206 | dev->tx_queue_len = 25 /* 5 */; |
| 207 | memset(dev->broadcast, 0xFF, HIPPI_ALEN); |
| 208 | |
| 209 | |
| 210 | /* |
| 211 | * HIPPI doesn't support broadcast+multicast and we only use |
| 212 | * static ARP tables. ARP is disabled by hippi_neigh_setup_dev. |
| 213 | */ |
| 214 | dev->flags = 0; |
| 215 | } |
| 216 | |
| 217 | /** |
| 218 | * alloc_hippi_dev - Register HIPPI device |
| 219 | * @sizeof_priv: Size of additional driver-private structure to be allocated |
| 220 | * for this HIPPI device |
| 221 | * |
| 222 | * Fill in the fields of the device structure with HIPPI-generic values. |
| 223 | * |
| 224 | * Constructs a new net device, complete with a private data area of |
| 225 | * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for |
| 226 | * this private data area. |
| 227 | */ |
| 228 | |
| 229 | struct net_device *alloc_hippi_dev(int sizeof_priv) |
| 230 | { |
| 231 | return alloc_netdev(sizeof_priv, "hip%d", hippi_setup); |
| 232 | } |
| 233 | |
| 234 | EXPORT_SYMBOL(alloc_hippi_dev); |