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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
193 lines
4.9 KiB
C
193 lines
4.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* HIPPI-type device handling.
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*
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* Version: @(#)hippi.c 1.0.0 05/29/97
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*
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* Authors: Ross Biro
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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* Mark Evans, <evansmp@uhura.aston.ac.uk>
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* Florian La Roche, <rzsfl@rz.uni-sb.de>
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* Alan Cox, <gw4pts@gw4pts.ampr.org>
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* Jes Sorensen, <Jes.Sorensen@cern.ch>
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/hippidevice.h>
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#include <linux/skbuff.h>
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#include <linux/errno.h>
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#include <net/arp.h>
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#include <net/sock.h>
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#include <linux/uaccess.h>
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/*
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* Create the HIPPI MAC header for an arbitrary protocol layer
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*
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* saddr=NULL means use device source address
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* daddr=NULL means leave destination address (eg unresolved arp)
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*/
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static int hippi_header(struct sk_buff *skb, struct net_device *dev,
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unsigned short type,
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const void *daddr, const void *saddr, unsigned int len)
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{
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struct hippi_hdr *hip = skb_push(skb, HIPPI_HLEN);
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struct hippi_cb *hcb = (struct hippi_cb *) skb->cb;
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if (!len){
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len = skb->len - HIPPI_HLEN;
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printk("hippi_header(): length not supplied\n");
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}
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/*
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* Due to the stupidity of the little endian byte-order we
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* have to set the fp field this way.
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*/
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hip->fp.fixed = htonl(0x04800018);
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hip->fp.d2_size = htonl(len + 8);
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hip->le.fc = 0;
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hip->le.double_wide = 0; /* only HIPPI 800 for the time being */
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hip->le.message_type = 0; /* Data PDU */
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hip->le.dest_addr_type = 2; /* 12 bit SC address */
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hip->le.src_addr_type = 2; /* 12 bit SC address */
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memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3);
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memset(&hip->le.reserved, 0, 16);
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hip->snap.dsap = HIPPI_EXTENDED_SAP;
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hip->snap.ssap = HIPPI_EXTENDED_SAP;
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hip->snap.ctrl = HIPPI_UI_CMD;
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hip->snap.oui[0] = 0x00;
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hip->snap.oui[1] = 0x00;
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hip->snap.oui[2] = 0x00;
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hip->snap.ethertype = htons(type);
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if (daddr)
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{
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memcpy(hip->le.dest_switch_addr, daddr + 3, 3);
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memcpy(&hcb->ifield, daddr + 2, 4);
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return HIPPI_HLEN;
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}
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hcb->ifield = 0;
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return -((int)HIPPI_HLEN);
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}
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/*
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* Determine the packet's protocol ID.
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*/
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__be16 hippi_type_trans(struct sk_buff *skb, struct net_device *dev)
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{
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struct hippi_hdr *hip;
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/*
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* This is actually wrong ... question is if we really should
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* set the raw address here.
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*/
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skb->dev = dev;
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skb_reset_mac_header(skb);
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hip = (struct hippi_hdr *)skb_mac_header(skb);
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skb_pull(skb, HIPPI_HLEN);
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/*
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* No fancy promisc stuff here now.
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*/
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return hip->snap.ethertype;
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}
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EXPORT_SYMBOL(hippi_type_trans);
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/*
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* For HIPPI we will actually use the lower 4 bytes of the hardware
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* address as the I-FIELD rather than the actual hardware address.
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*/
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int hippi_mac_addr(struct net_device *dev, void *p)
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{
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struct sockaddr *addr = p;
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if (netif_running(dev))
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return -EBUSY;
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memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
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return 0;
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}
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EXPORT_SYMBOL(hippi_mac_addr);
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int hippi_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
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{
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/* Never send broadcast/multicast ARP messages */
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NEIGH_VAR_INIT(p, MCAST_PROBES, 0);
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/* In IPv6 unicast probes are valid even on NBMA,
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* because they are encapsulated in normal IPv6 protocol.
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* Should be a generic flag.
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*/
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if (p->tbl->family != AF_INET6)
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NEIGH_VAR_INIT(p, UCAST_PROBES, 0);
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return 0;
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}
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EXPORT_SYMBOL(hippi_neigh_setup_dev);
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static const struct header_ops hippi_header_ops = {
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.create = hippi_header,
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};
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static void hippi_setup(struct net_device *dev)
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{
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dev->header_ops = &hippi_header_ops;
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/*
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* We don't support HIPPI `ARP' for the time being, and probably
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* never will unless someone else implements it. However we
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* still need a fake ARPHRD to make ifconfig and friends play ball.
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*/
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dev->type = ARPHRD_HIPPI;
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dev->hard_header_len = HIPPI_HLEN;
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dev->mtu = 65280;
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dev->min_mtu = 68;
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dev->max_mtu = 65280;
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dev->addr_len = HIPPI_ALEN;
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dev->tx_queue_len = 25 /* 5 */;
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memset(dev->broadcast, 0xFF, HIPPI_ALEN);
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/*
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* HIPPI doesn't support broadcast+multicast and we only use
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* static ARP tables. ARP is disabled by hippi_neigh_setup_dev.
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*/
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dev->flags = 0;
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}
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/**
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* alloc_hippi_dev - Register HIPPI device
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* @sizeof_priv: Size of additional driver-private structure to be allocated
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* for this HIPPI device
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*
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* Fill in the fields of the device structure with HIPPI-generic values.
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*
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* Constructs a new net device, complete with a private data area of
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* size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
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* this private data area.
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*/
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struct net_device *alloc_hippi_dev(int sizeof_priv)
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{
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return alloc_netdev(sizeof_priv, "hip%d", NET_NAME_UNKNOWN,
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hippi_setup);
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}
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EXPORT_SYMBOL(alloc_hippi_dev);
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