--- /dev/null
+/*
+ * 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);
+}
+
+
+/*
+ * 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 */
+ NEIGH_VAR_INIT(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)
+ NEIGH_VAR_INIT(p, UCAST_PROBES, 0);
+ return 0;
+}
+EXPORT_SYMBOL(hippi_neigh_setup_dev);
+
+static const struct header_ops hippi_header_ops = {
+ .create = hippi_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", NET_NAME_UNKNOWN,
+ hippi_setup);
+}
+
+EXPORT_SYMBOL(alloc_hippi_dev);
Code Review / kvmfornfv.git / blobdiff