/* * 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> /* * 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, const void *daddr, const void *saddr, unsigned int 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_header(skb); skb_pull(skb, HIPPI_HLEN); /* * No fancy promisc stuff here now. */ return hip->snap.ethertype; } EXPORT_SYMBOL(hippi_type_trans); 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; } EXPORT_SYMBOL(hippi_change_mtu); /* * For HIPPI we will actually use the lower 4 bytes of the hardware * address as the I-FIELD rather than the actual hardware address. */ 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; } EXPORT_SYMBOL(hippi_mac_addr); 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; } EXPORT_SYMBOL(hippi_neigh_setup_dev); static const struct header_ops hippi_header_ops = { .create = hippi_header, .rebuild = hippi_rebuild_header, }; static void hippi_setup(struct net_device *dev) { dev->header_ops = &hippi_header_ops; /* * 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);