138 lines
3.3 KiB
C
138 lines
3.3 KiB
C
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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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* Pseudo-driver for the loopback interface.
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*
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* Version: @(#)loopback.c 1.0.4b 08/16/93
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*
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* Authors: Ross Biro, <bir7@leland.Stanford.Edu>
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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* Donald Becker, <becker@super.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/socket.h>
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#include <linux/errno.h>
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#include <linux/fcntl.h>
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#include <linux/in.h>
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#include <linux/if_ether.h> /* For the statistics structure. */
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#include <asm/system.h>
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#include <asm/segment.h>
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#include <asm/io.h>
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#include "inet.h"
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#include "dev.h"
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#include "eth.h"
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#include "ip.h"
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#include "protocol.h"
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#include "tcp.h"
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#include "skbuff.h"
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#include "sock.h"
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#include "arp.h"
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static int
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loopback_xmit(struct sk_buff *skb, struct device *dev)
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{
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struct enet_statistics *stats = (struct enet_statistics *)dev->priv;
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int done;
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DPRINTF((DBG_LOOPB, "loopback_xmit(dev=%X, skb=%X)\n", dev, skb));
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if (skb == NULL || dev == NULL) return(0);
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cli();
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if (dev->tbusy != 0) {
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sti();
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stats->tx_errors++;
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return(1);
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}
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dev->tbusy = 1;
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sti();
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done = dev_rint(skb->data, skb->len, 0, dev);
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if (skb->free) kfree_skb(skb, FREE_WRITE);
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while (done != 1) {
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done = dev_rint(NULL, 0, 0, dev);
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}
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stats->tx_packets++;
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dev->tbusy = 0;
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#if 1
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__asm__("cmpl $0,_intr_count\n\t"
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"jne 1f\n\t"
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"movl _bh_active,%%eax\n\t"
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"testl _bh_mask,%%eax\n\t"
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"je 1f\n\t"
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"incl _intr_count\n\t"
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"call _do_bottom_half\n\t"
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"decl _intr_count\n"
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"1:"
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:
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:
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: "ax", "dx", "cx");
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#endif
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return(0);
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}
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static struct enet_statistics *
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get_stats(struct device *dev)
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{
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return (struct enet_statistics *)dev->priv;
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}
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/* Initialize the rest of the LOOPBACK device. */
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int
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loopback_init(struct device *dev)
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{
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dev->mtu = 2000; /* MTU */
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dev->tbusy = 0;
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dev->hard_start_xmit = loopback_xmit;
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dev->open = NULL;
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#if 1
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dev->hard_header = eth_header;
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dev->add_arp = NULL;
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dev->hard_header_len = ETH_HLEN; /* 14 */
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dev->addr_len = ETH_ALEN; /* 6 */
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dev->type = ARPHRD_ETHER; /* 0x0001 */
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dev->type_trans = eth_type_trans;
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dev->rebuild_header = eth_rebuild_header;
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#else
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dev->hard_header_length = 0;
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dev->add_arp = NULL;
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dev->addr_len = 0;
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dev->type = 0; /* loopback_type (0) */
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dev->hard_header = NULL;
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dev->type_trans = NULL;
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dev->rebuild_header = NULL;
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#endif
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dev->queue_xmit = dev_queue_xmit;
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/* New-style flags. */
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dev->flags = IFF_LOOPBACK;
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dev->family = AF_INET;
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dev->pa_addr = in_aton("127.0.0.1");
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dev->pa_brdaddr = in_aton("127.255.255.255");
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dev->pa_mask = in_aton("255.0.0.0");
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dev->pa_alen = sizeof(unsigned long);
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dev->priv = kmalloc(sizeof(struct enet_statistics), GFP_KERNEL);
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memset(dev->priv, 0, sizeof(struct enet_statistics));
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dev->get_stats = get_stats;
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return(0);
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};
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