| /* |
| * 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. |
| * |
| * Pseudo-driver for the loopback interface. |
| * |
| * Version: @(#)loopback.c 1.0.4 05/25/93 |
| * |
| * Authors: Ross Biro, <bir7@leland.Stanford.Edu> |
| * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| * |
| * 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 <asm/system.h> |
| #include <asm/segment.h> |
| #include <asm/io.h> |
| #include <linux/config.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/fs.h> |
| #include <linux/tty.h> |
| #include <linux/types.h> |
| #include <linux/ptrace.h> |
| #include <linux/string.h> |
| #include <linux/socket.h> |
| #include <linux/errno.h> |
| #include <linux/fcntl.h> |
| #include <linux/in.h> |
| #include "inet.h" |
| #include "dev.h" |
| #include "eth.h" |
| #include "timer.h" |
| #include "ip.h" |
| #include "protocol.h" |
| #include "tcp.h" |
| #include "skbuff.h" |
| #include "sock.h" |
| #include "arp.h" |
| |
| |
| static int |
| loopback_xmit(struct sk_buff *skb, struct device *dev) |
| { |
| int done; |
| |
| DPRINTF((DBG_LOOPB, "loopback_xmit(dev=%X, skb=%X)\n", dev, skb)); |
| if (skb == NULL || dev == NULL) return(0); |
| |
| cli(); |
| if (dev->tbusy != 0) { |
| sti(); |
| return(1); |
| } |
| dev->tbusy = 1; |
| sti(); |
| |
| done = dev_rint((unsigned char *)(skb+1), skb->len, 0, dev); |
| if (skb->free) kfree_skb(skb, FREE_WRITE); |
| |
| while (done != 1) { |
| done = dev_rint(NULL, 0, 0, dev); |
| } |
| dev->tbusy = 0; |
| |
| #if 1 |
| __asm__("cmpl $0,_intr_count\n\t" |
| "jne 1f\n\t" |
| "movl _bh_active,%%eax\n\t" |
| "testl _bh_mask,%%eax\n\t" |
| "je 1f\n\t" |
| "incl _intr_count\n\t" |
| "call _do_bottom_half\n\t" |
| "decl _intr_count\n" |
| "1:" |
| : |
| : |
| : "ax", "dx", "cx"); |
| #endif |
| |
| return(0); |
| } |
| |
| |
| /* Initialize the rest of the LOOPBACK device. */ |
| int |
| loopback_init(struct device *dev) |
| { |
| dev->mtu = 2000; /* MTU */ |
| dev->tbusy = 0; |
| dev->hard_start_xmit = loopback_xmit; |
| dev->open = NULL; |
| #if 1 |
| dev->hard_header = eth_header; |
| dev->add_arp = NULL; |
| dev->hard_header_len = ETH_HLEN; /* 14 */ |
| dev->addr_len = ETH_ALEN; /* 6 */ |
| dev->type = ARPHRD_ETHER; /* 0x0001 */ |
| dev->type_trans = eth_type_trans; |
| dev->rebuild_header = eth_rebuild_header; |
| #else |
| dev->hard_header_length = 0; |
| dev->add_arp = NULL; |
| dev->addr_len = 0; |
| dev->type = 0; /* loopback_type (0) */ |
| dev->hard_header = NULL; |
| dev->type_trans = NULL; |
| dev->rebuild_header = NULL; |
| #endif |
| dev->queue_xmit = dev_queue_xmit; |
| |
| /* New-style flags. */ |
| dev->flags = IFF_LOOPBACK; |
| dev->family = AF_INET; |
| dev->pa_addr = in_aton("127.0.0.1"); |
| dev->pa_brdaddr = in_aton("127.255.255.255"); |
| dev->pa_mask = in_aton("255.0.0.0"); |
| dev->pa_alen = sizeof(unsigned long); |
| |
| return(0); |
| }; |