cd354f1ae7
After Al Viro (finally) succeeded in removing the sched.h #include in module.h recently, it makes sense again to remove other superfluous sched.h includes. There are quite a lot of files which include it but don't actually need anything defined in there. Presumably these includes were once needed for macros that used to live in sched.h, but moved to other header files in the course of cleaning it up. To ease the pain, this time I did not fiddle with any header files and only removed #includes from .c-files, which tend to cause less trouble. Compile tested against 2.6.20-rc2 and 2.6.20-rc2-mm2 (with offsets) on alpha, arm, i386, ia64, mips, powerpc, and x86_64 with allnoconfig, defconfig, allmodconfig, and allyesconfig as well as a few randconfigs on x86_64 and all configs in arch/arm/configs on arm. I also checked that no new warnings were introduced by the patch (actually, some warnings are removed that were emitted by unnecessarily included header files). Signed-off-by: Tim Schmielau <tim@physik3.uni-rostock.de> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
382 lines
8.5 KiB
C
382 lines
8.5 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
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* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
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* Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
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*/
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/timer.h>
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#include <linux/string.h>
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#include <linux/sockios.h>
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#include <linux/spinlock.h>
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#include <linux/net.h>
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#include <net/ax25.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/netfilter.h>
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#include <net/sock.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <linux/fcntl.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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static DEFINE_SPINLOCK(ax25_frag_lock);
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ax25_cb *ax25_send_frame(struct sk_buff *skb, int paclen, ax25_address *src, ax25_address *dest, ax25_digi *digi, struct net_device *dev)
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{
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ax25_dev *ax25_dev;
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ax25_cb *ax25;
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/*
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* Take the default packet length for the device if zero is
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* specified.
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*/
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if (paclen == 0) {
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if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
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return NULL;
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paclen = ax25_dev->values[AX25_VALUES_PACLEN];
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}
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/*
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* Look for an existing connection.
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*/
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if ((ax25 = ax25_find_cb(src, dest, digi, dev)) != NULL) {
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ax25_output(ax25, paclen, skb);
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return ax25; /* It already existed */
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}
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if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
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return NULL;
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if ((ax25 = ax25_create_cb()) == NULL)
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return NULL;
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ax25_fillin_cb(ax25, ax25_dev);
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ax25->source_addr = *src;
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ax25->dest_addr = *dest;
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if (digi != NULL) {
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ax25->digipeat = kmemdup(digi, sizeof(*digi), GFP_ATOMIC);
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if (ax25->digipeat == NULL) {
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ax25_cb_put(ax25);
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return NULL;
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}
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}
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switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
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case AX25_PROTO_STD_SIMPLEX:
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case AX25_PROTO_STD_DUPLEX:
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ax25_std_establish_data_link(ax25);
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break;
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#ifdef CONFIG_AX25_DAMA_SLAVE
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case AX25_PROTO_DAMA_SLAVE:
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if (ax25_dev->dama.slave)
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ax25_ds_establish_data_link(ax25);
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else
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ax25_std_establish_data_link(ax25);
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break;
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#endif
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}
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ax25_cb_add(ax25);
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ax25->state = AX25_STATE_1;
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ax25_start_heartbeat(ax25);
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ax25_output(ax25, paclen, skb);
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return ax25; /* We had to create it */
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}
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EXPORT_SYMBOL(ax25_send_frame);
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/*
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* All outgoing AX.25 I frames pass via this routine. Therefore this is
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* where the fragmentation of frames takes place. If fragment is set to
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* zero then we are not allowed to do fragmentation, even if the frame
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* is too large.
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*/
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void ax25_output(ax25_cb *ax25, int paclen, struct sk_buff *skb)
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{
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struct sk_buff *skbn;
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unsigned char *p;
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int frontlen, len, fragno, ka9qfrag, first = 1;
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if ((skb->len - 1) > paclen) {
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if (*skb->data == AX25_P_TEXT) {
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skb_pull(skb, 1); /* skip PID */
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ka9qfrag = 0;
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} else {
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paclen -= 2; /* Allow for fragment control info */
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ka9qfrag = 1;
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}
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fragno = skb->len / paclen;
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if (skb->len % paclen == 0) fragno--;
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frontlen = skb_headroom(skb); /* Address space + CTRL */
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while (skb->len > 0) {
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spin_lock_bh(&ax25_frag_lock);
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if ((skbn = alloc_skb(paclen + 2 + frontlen, GFP_ATOMIC)) == NULL) {
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spin_unlock_bh(&ax25_frag_lock);
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printk(KERN_CRIT "AX.25: ax25_output - out of memory\n");
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return;
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}
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if (skb->sk != NULL)
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skb_set_owner_w(skbn, skb->sk);
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spin_unlock_bh(&ax25_frag_lock);
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len = (paclen > skb->len) ? skb->len : paclen;
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if (ka9qfrag == 1) {
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skb_reserve(skbn, frontlen + 2);
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skbn->nh.raw = skbn->data + (skb->nh.raw - skb->data);
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memcpy(skb_put(skbn, len), skb->data, len);
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p = skb_push(skbn, 2);
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*p++ = AX25_P_SEGMENT;
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*p = fragno--;
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if (first) {
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*p |= AX25_SEG_FIRST;
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first = 0;
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}
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} else {
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skb_reserve(skbn, frontlen + 1);
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skbn->nh.raw = skbn->data + (skb->nh.raw - skb->data);
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memcpy(skb_put(skbn, len), skb->data, len);
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p = skb_push(skbn, 1);
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*p = AX25_P_TEXT;
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}
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skb_pull(skb, len);
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skb_queue_tail(&ax25->write_queue, skbn); /* Throw it on the queue */
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}
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kfree_skb(skb);
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} else {
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skb_queue_tail(&ax25->write_queue, skb); /* Throw it on the queue */
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}
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switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
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case AX25_PROTO_STD_SIMPLEX:
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case AX25_PROTO_STD_DUPLEX:
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ax25_kick(ax25);
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break;
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#ifdef CONFIG_AX25_DAMA_SLAVE
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/*
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* A DAMA slave is _required_ to work as normal AX.25L2V2
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* if no DAMA master is available.
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*/
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case AX25_PROTO_DAMA_SLAVE:
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if (!ax25->ax25_dev->dama.slave) ax25_kick(ax25);
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break;
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#endif
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}
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}
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/*
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* This procedure is passed a buffer descriptor for an iframe. It builds
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* the rest of the control part of the frame and then writes it out.
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*/
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static void ax25_send_iframe(ax25_cb *ax25, struct sk_buff *skb, int poll_bit)
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{
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unsigned char *frame;
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if (skb == NULL)
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return;
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skb->nh.raw = skb->data;
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if (ax25->modulus == AX25_MODULUS) {
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frame = skb_push(skb, 1);
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*frame = AX25_I;
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*frame |= (poll_bit) ? AX25_PF : 0;
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*frame |= (ax25->vr << 5);
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*frame |= (ax25->vs << 1);
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} else {
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frame = skb_push(skb, 2);
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frame[0] = AX25_I;
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frame[0] |= (ax25->vs << 1);
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frame[1] = (poll_bit) ? AX25_EPF : 0;
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frame[1] |= (ax25->vr << 1);
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}
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ax25_start_idletimer(ax25);
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ax25_transmit_buffer(ax25, skb, AX25_COMMAND);
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}
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void ax25_kick(ax25_cb *ax25)
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{
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struct sk_buff *skb, *skbn;
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int last = 1;
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unsigned short start, end, next;
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if (ax25->state != AX25_STATE_3 && ax25->state != AX25_STATE_4)
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return;
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if (ax25->condition & AX25_COND_PEER_RX_BUSY)
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return;
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if (skb_peek(&ax25->write_queue) == NULL)
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return;
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start = (skb_peek(&ax25->ack_queue) == NULL) ? ax25->va : ax25->vs;
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end = (ax25->va + ax25->window) % ax25->modulus;
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if (start == end)
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return;
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ax25->vs = start;
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/*
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* Transmit data until either we're out of data to send or
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* the window is full. Send a poll on the final I frame if
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* the window is filled.
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*/
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/*
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* Dequeue the frame and copy it.
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*/
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skb = skb_dequeue(&ax25->write_queue);
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do {
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if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
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skb_queue_head(&ax25->write_queue, skb);
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break;
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}
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if (skb->sk != NULL)
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skb_set_owner_w(skbn, skb->sk);
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next = (ax25->vs + 1) % ax25->modulus;
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last = (next == end);
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/*
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* Transmit the frame copy.
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* bke 960114: do not set the Poll bit on the last frame
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* in DAMA mode.
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*/
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switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
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case AX25_PROTO_STD_SIMPLEX:
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case AX25_PROTO_STD_DUPLEX:
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ax25_send_iframe(ax25, skbn, (last) ? AX25_POLLON : AX25_POLLOFF);
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break;
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#ifdef CONFIG_AX25_DAMA_SLAVE
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case AX25_PROTO_DAMA_SLAVE:
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ax25_send_iframe(ax25, skbn, AX25_POLLOFF);
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break;
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#endif
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}
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ax25->vs = next;
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/*
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* Requeue the original data frame.
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*/
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skb_queue_tail(&ax25->ack_queue, skb);
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} while (!last && (skb = skb_dequeue(&ax25->write_queue)) != NULL);
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ax25->condition &= ~AX25_COND_ACK_PENDING;
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if (!ax25_t1timer_running(ax25)) {
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ax25_stop_t3timer(ax25);
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ax25_calculate_t1(ax25);
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ax25_start_t1timer(ax25);
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}
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}
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void ax25_transmit_buffer(ax25_cb *ax25, struct sk_buff *skb, int type)
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{
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struct sk_buff *skbn;
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unsigned char *ptr;
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int headroom;
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if (ax25->ax25_dev == NULL) {
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ax25_disconnect(ax25, ENETUNREACH);
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return;
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}
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headroom = ax25_addr_size(ax25->digipeat);
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if (skb_headroom(skb) < headroom) {
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if ((skbn = skb_realloc_headroom(skb, headroom)) == NULL) {
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printk(KERN_CRIT "AX.25: ax25_transmit_buffer - out of memory\n");
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kfree_skb(skb);
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return;
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}
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if (skb->sk != NULL)
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skb_set_owner_w(skbn, skb->sk);
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kfree_skb(skb);
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skb = skbn;
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}
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ptr = skb_push(skb, headroom);
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ax25_addr_build(ptr, &ax25->source_addr, &ax25->dest_addr, ax25->digipeat, type, ax25->modulus);
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ax25_queue_xmit(skb, ax25->ax25_dev->dev);
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}
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/*
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* A small shim to dev_queue_xmit to add the KISS control byte, and do
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* any packet forwarding in operation.
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*/
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void ax25_queue_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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unsigned char *ptr;
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skb->protocol = ax25_type_trans(skb, ax25_fwd_dev(dev));
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ptr = skb_push(skb, 1);
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*ptr = 0x00; /* KISS */
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dev_queue_xmit(skb);
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}
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int ax25_check_iframes_acked(ax25_cb *ax25, unsigned short nr)
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{
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if (ax25->vs == nr) {
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ax25_frames_acked(ax25, nr);
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ax25_calculate_rtt(ax25);
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ax25_stop_t1timer(ax25);
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ax25_start_t3timer(ax25);
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return 1;
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} else {
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if (ax25->va != nr) {
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ax25_frames_acked(ax25, nr);
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ax25_calculate_t1(ax25);
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ax25_start_t1timer(ax25);
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return 1;
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}
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}
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return 0;
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}
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