| /* |
| * INET An implementation of the TCP/IP protocol suite for the LINUX |
| * operating system. INET is implemented using the BSD Socket |
| * interface as the means of communication with the user level. |
| * |
| * HIPPI-type device handling. |
| * |
| * Version: @(#)hippi.c 1.0.0 05/29/97 |
| * |
| * Authors: Ross Biro |
| * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| * Mark Evans, <evansmp@uhura.aston.ac.uk> |
| * Florian La Roche, <rzsfl@rz.uni-sb.de> |
| * Alan Cox, <gw4pts@gw4pts.ampr.org> |
| * Jes Sorensen, <Jes.Sorensen@cern.ch> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <linux/kernel.h> |
| #include <linux/string.h> |
| #include <linux/mm.h> |
| #include <linux/socket.h> |
| #include <linux/in.h> |
| #include <linux/inet.h> |
| #include <linux/netdevice.h> |
| #include <linux/hippidevice.h> |
| #include <linux/skbuff.h> |
| #include <linux/errno.h> |
| #include <net/arp.h> |
| #include <net/sock.h> |
| #include <asm/uaccess.h> |
| #include <asm/system.h> |
| |
| /* |
| * Create the HIPPI MAC header for an arbitrary protocol layer |
| * |
| * saddr=NULL means use device source address |
| * daddr=NULL means leave destination address (eg unresolved arp) |
| */ |
| |
| static int hippi_header(struct sk_buff *skb, struct net_device *dev, |
| unsigned short type, void *daddr, void *saddr, |
| unsigned len) |
| { |
| struct hippi_hdr *hip = (struct hippi_hdr *)skb_push(skb, HIPPI_HLEN); |
| struct hippi_cb *hcb = (struct hippi_cb *) skb->cb; |
| |
| if (!len){ |
| len = skb->len - HIPPI_HLEN; |
| printk("hippi_header(): length not supplied\n"); |
| } |
| |
| /* |
| * Due to the stupidity of the little endian byte-order we |
| * have to set the fp field this way. |
| */ |
| hip->fp.fixed = htonl(0x04800018); |
| hip->fp.d2_size = htonl(len + 8); |
| hip->le.fc = 0; |
| hip->le.double_wide = 0; /* only HIPPI 800 for the time being */ |
| hip->le.message_type = 0; /* Data PDU */ |
| |
| hip->le.dest_addr_type = 2; /* 12 bit SC address */ |
| hip->le.src_addr_type = 2; /* 12 bit SC address */ |
| |
| memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3); |
| memset(&hip->le.reserved, 0, 16); |
| |
| hip->snap.dsap = HIPPI_EXTENDED_SAP; |
| hip->snap.ssap = HIPPI_EXTENDED_SAP; |
| hip->snap.ctrl = HIPPI_UI_CMD; |
| hip->snap.oui[0] = 0x00; |
| hip->snap.oui[1] = 0x00; |
| hip->snap.oui[2] = 0x00; |
| hip->snap.ethertype = htons(type); |
| |
| if (daddr) |
| { |
| memcpy(hip->le.dest_switch_addr, daddr + 3, 3); |
| memcpy(&hcb->ifield, daddr + 2, 4); |
| return HIPPI_HLEN; |
| } |
| hcb->ifield = 0; |
| return -((int)HIPPI_HLEN); |
| } |
| |
| |
| /* |
| * Rebuild the HIPPI MAC header. This is called after an ARP has |
| * completed on this sk_buff. We now let ARP fill in the other fields. |
| */ |
| |
| static int hippi_rebuild_header(struct sk_buff *skb) |
| { |
| struct hippi_hdr *hip = (struct hippi_hdr *)skb->data; |
| |
| /* |
| * Only IP is currently supported |
| */ |
| |
| if(hip->snap.ethertype != htons(ETH_P_IP)) |
| { |
| printk(KERN_DEBUG "%s: unable to resolve type %X addresses.\n",skb->dev->name,ntohs(hip->snap.ethertype)); |
| return 0; |
| } |
| |
| /* |
| * We don't support dynamic ARP on HIPPI, but we use the ARP |
| * static ARP tables to hold the I-FIELDs. |
| */ |
| return arp_find(hip->le.daddr, skb); |
| } |
| |
| |
| /* |
| * Determine the packet's protocol ID. |
| */ |
| |
| __be16 hippi_type_trans(struct sk_buff *skb, struct net_device *dev) |
| { |
| struct hippi_hdr *hip; |
| |
| /* |
| * This is actually wrong ... question is if we really should |
| * set the raw address here. |
| */ |
| skb->dev = dev; |
| skb_reset_mac_header(skb); |
| hip = (struct hippi_hdr *)skb->mac.raw; |
| skb_pull(skb, HIPPI_HLEN); |
| |
| /* |
| * No fancy promisc stuff here now. |
| */ |
| |
| return hip->snap.ethertype; |
| } |
| |
| EXPORT_SYMBOL(hippi_type_trans); |
| |
| static int hippi_change_mtu(struct net_device *dev, int new_mtu) |
| { |
| /* |
| * HIPPI's got these nice large MTUs. |
| */ |
| if ((new_mtu < 68) || (new_mtu > 65280)) |
| return -EINVAL; |
| dev->mtu = new_mtu; |
| return(0); |
| } |
| |
| /* |
| * For HIPPI we will actually use the lower 4 bytes of the hardware |
| * address as the I-FIELD rather than the actual hardware address. |
| */ |
| static int hippi_mac_addr(struct net_device *dev, void *p) |
| { |
| struct sockaddr *addr = p; |
| if (netif_running(dev)) |
| return -EBUSY; |
| memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); |
| return 0; |
| } |
| |
| static int hippi_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p) |
| { |
| /* Never send broadcast/multicast ARP messages */ |
| p->mcast_probes = 0; |
| |
| /* In IPv6 unicast probes are valid even on NBMA, |
| * because they are encapsulated in normal IPv6 protocol. |
| * Should be a generic flag. |
| */ |
| if (p->tbl->family != AF_INET6) |
| p->ucast_probes = 0; |
| return 0; |
| } |
| |
| static void hippi_setup(struct net_device *dev) |
| { |
| dev->set_multicast_list = NULL; |
| dev->change_mtu = hippi_change_mtu; |
| dev->hard_header = hippi_header; |
| dev->rebuild_header = hippi_rebuild_header; |
| dev->set_mac_address = hippi_mac_addr; |
| dev->hard_header_parse = NULL; |
| dev->hard_header_cache = NULL; |
| dev->header_cache_update = NULL; |
| dev->neigh_setup = hippi_neigh_setup_dev; |
| |
| /* |
| * We don't support HIPPI `ARP' for the time being, and probably |
| * never will unless someone else implements it. However we |
| * still need a fake ARPHRD to make ifconfig and friends play ball. |
| */ |
| dev->type = ARPHRD_HIPPI; |
| dev->hard_header_len = HIPPI_HLEN; |
| dev->mtu = 65280; |
| dev->addr_len = HIPPI_ALEN; |
| dev->tx_queue_len = 25 /* 5 */; |
| memset(dev->broadcast, 0xFF, HIPPI_ALEN); |
| |
| |
| /* |
| * HIPPI doesn't support broadcast+multicast and we only use |
| * static ARP tables. ARP is disabled by hippi_neigh_setup_dev. |
| */ |
| dev->flags = 0; |
| } |
| |
| /** |
| * alloc_hippi_dev - Register HIPPI device |
| * @sizeof_priv: Size of additional driver-private structure to be allocated |
| * for this HIPPI device |
| * |
| * Fill in the fields of the device structure with HIPPI-generic values. |
| * |
| * Constructs a new net device, complete with a private data area of |
| * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for |
| * this private data area. |
| */ |
| |
| struct net_device *alloc_hippi_dev(int sizeof_priv) |
| { |
| return alloc_netdev(sizeof_priv, "hip%d", hippi_setup); |
| } |
| |
| EXPORT_SYMBOL(alloc_hippi_dev); |