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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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5cbded585d
Run this: #!/bin/sh for f in $(grep -Erl "\([^\)]*\) *k[cmz]alloc" *) ; do echo "De-casting $f..." perl -pi -e "s/ ?= ?\([^\)]*\) *(k[cmz]alloc) *\(/ = \1\(/" $f done And then go through and reinstate those cases where code is casting pointers to non-pointers. And then drop a few hunks which conflicted with outstanding work. Cc: Russell King <rmk@arm.linux.org.uk>, Ian Molton <spyro@f2s.com> Cc: Mikael Starvik <starvik@axis.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jeff Dike <jdike@addtoit.com> Cc: Greg KH <greg@kroah.com> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: Paul Fulghum <paulkf@microgate.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Karsten Keil <kkeil@suse.de> Cc: Mauro Carvalho Chehab <mchehab@infradead.org> Cc: Jeff Garzik <jeff@garzik.org> Cc: James Bottomley <James.Bottomley@steeleye.com> Cc: Ian Kent <raven@themaw.net> Cc: Steven French <sfrench@us.ibm.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Neil Brown <neilb@cse.unsw.edu.au> Cc: Jaroslav Kysela <perex@suse.cz> Cc: Takashi Iwai <tiwai@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1500 lines
34 KiB
C
1500 lines
34 KiB
C
/*
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* slip.c This module implements the SLIP protocol for kernel-based
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* devices like TTY. It interfaces between a raw TTY, and the
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* kernel's INET protocol layers.
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*
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* Version: @(#)slip.c 0.8.3 12/24/94
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*
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* Authors: Laurence Culhane, <loz@holmes.demon.co.uk>
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* Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
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*
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* Fixes:
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* Alan Cox : Sanity checks and avoid tx overruns.
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* Has a new sl->mtu field.
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* Alan Cox : Found cause of overrun. ifconfig sl0 mtu upwards.
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* Driver now spots this and grows/shrinks its buffers(hack!).
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* Memory leak if you run out of memory setting up a slip driver fixed.
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* Matt Dillon : Printable slip (borrowed from NET2E)
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* Pauline Middelink : Slip driver fixes.
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* Alan Cox : Honours the old SL_COMPRESSED flag
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* Alan Cox : KISS AX.25 and AXUI IP support
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* Michael Riepe : Automatic CSLIP recognition added
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* Charles Hedrick : CSLIP header length problem fix.
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* Alan Cox : Corrected non-IP cases of the above.
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* Alan Cox : Now uses hardware type as per FvK.
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* Alan Cox : Default to 192.168.0.0 (RFC 1597)
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* A.N.Kuznetsov : dev_tint() recursion fix.
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* Dmitry Gorodchanin : SLIP memory leaks
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* Dmitry Gorodchanin : Code cleanup. Reduce tty driver
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* buffering from 4096 to 256 bytes.
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* Improving SLIP response time.
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* CONFIG_SLIP_MODE_SLIP6.
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* ifconfig sl? up & down now works correctly.
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* Modularization.
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* Alan Cox : Oops - fix AX.25 buffer lengths
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* Dmitry Gorodchanin : Even more cleanups. Preserve CSLIP
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* statistics. Include CSLIP code only
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* if it really needed.
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* Alan Cox : Free slhc buffers in the right place.
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* Alan Cox : Allow for digipeated IP over AX.25
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* Matti Aarnio : Dynamic SLIP devices, with ideas taken
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* from Jim Freeman's <jfree@caldera.com>
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* dynamic PPP devices. We do NOT kfree()
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* device entries, just reg./unreg. them
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* as they are needed. We kfree() them
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* at module cleanup.
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* With MODULE-loading ``insmod'', user can
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* issue parameter: slip_maxdev=1024
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* (Or how much he/she wants.. Default is 256)
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* * Stanislav Voronyi : Slip line checking, with ideas taken
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* from multislip BSDI driver which was written
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* by Igor Chechik, RELCOM Corp. Only algorithms
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* have been ported to Linux SLIP driver.
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* Vitaly E. Lavrov : Sane behaviour on tty hangup.
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* Alexey Kuznetsov : Cleanup interfaces to tty&netdevice modules.
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*/
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#define SL_CHECK_TRANSMIT
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <linux/bitops.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/in.h>
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#include <linux/tty.h>
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#include <linux/errno.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <linux/if_arp.h>
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#include <linux/if_slip.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include "slip.h"
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#ifdef CONFIG_INET
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#include <linux/ip.h>
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#include <linux/tcp.h>
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#include <net/slhc_vj.h>
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#endif
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#define SLIP_VERSION "0.8.4-NET3.019-NEWTTY"
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static struct net_device **slip_devs;
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static int slip_maxdev = SL_NRUNIT;
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module_param(slip_maxdev, int, 0);
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MODULE_PARM_DESC(slip_maxdev, "Maximum number of slip devices");
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static int slip_esc(unsigned char *p, unsigned char *d, int len);
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static void slip_unesc(struct slip *sl, unsigned char c);
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#ifdef CONFIG_SLIP_MODE_SLIP6
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static int slip_esc6(unsigned char *p, unsigned char *d, int len);
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static void slip_unesc6(struct slip *sl, unsigned char c);
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#endif
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#ifdef CONFIG_SLIP_SMART
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static void sl_keepalive(unsigned long sls);
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static void sl_outfill(unsigned long sls);
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static int sl_ioctl(struct net_device *dev,struct ifreq *rq,int cmd);
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#endif
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/********************************
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* Buffer administration routines:
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* sl_alloc_bufs()
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* sl_free_bufs()
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* sl_realloc_bufs()
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*
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* NOTE: sl_realloc_bufs != sl_free_bufs + sl_alloc_bufs, because
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* sl_realloc_bufs provides strong atomicity and reallocation
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* on actively running device.
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*********************************/
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/*
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Allocate channel buffers.
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*/
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static int
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sl_alloc_bufs(struct slip *sl, int mtu)
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{
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int err = -ENOBUFS;
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unsigned long len;
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char * rbuff = NULL;
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char * xbuff = NULL;
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#ifdef SL_INCLUDE_CSLIP
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char * cbuff = NULL;
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struct slcompress *slcomp = NULL;
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#endif
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/*
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* Allocate the SLIP frame buffers:
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*
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* rbuff Receive buffer.
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* xbuff Transmit buffer.
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* cbuff Temporary compression buffer.
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*/
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len = mtu * 2;
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/*
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* allow for arrival of larger UDP packets, even if we say not to
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* also fixes a bug in which SunOS sends 512-byte packets even with
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* an MSS of 128
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*/
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if (len < 576 * 2)
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len = 576 * 2;
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rbuff = kmalloc(len + 4, GFP_KERNEL);
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if (rbuff == NULL)
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goto err_exit;
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xbuff = kmalloc(len + 4, GFP_KERNEL);
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if (xbuff == NULL)
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goto err_exit;
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#ifdef SL_INCLUDE_CSLIP
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cbuff = kmalloc(len + 4, GFP_KERNEL);
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if (cbuff == NULL)
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goto err_exit;
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slcomp = slhc_init(16, 16);
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if (slcomp == NULL)
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goto err_exit;
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#endif
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spin_lock_bh(&sl->lock);
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if (sl->tty == NULL) {
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spin_unlock_bh(&sl->lock);
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err = -ENODEV;
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goto err_exit;
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}
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sl->mtu = mtu;
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sl->buffsize = len;
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sl->rcount = 0;
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sl->xleft = 0;
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rbuff = xchg(&sl->rbuff, rbuff);
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xbuff = xchg(&sl->xbuff, xbuff);
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#ifdef SL_INCLUDE_CSLIP
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cbuff = xchg(&sl->cbuff, cbuff);
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slcomp = xchg(&sl->slcomp, slcomp);
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#ifdef CONFIG_SLIP_MODE_SLIP6
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sl->xdata = 0;
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sl->xbits = 0;
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#endif
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#endif
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spin_unlock_bh(&sl->lock);
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err = 0;
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/* Cleanup */
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err_exit:
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#ifdef SL_INCLUDE_CSLIP
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kfree(cbuff);
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if (slcomp)
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slhc_free(slcomp);
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#endif
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kfree(xbuff);
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kfree(rbuff);
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return err;
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}
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/* Free a SLIP channel buffers. */
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static void
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sl_free_bufs(struct slip *sl)
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{
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/* Free all SLIP frame buffers. */
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kfree(xchg(&sl->rbuff, NULL));
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kfree(xchg(&sl->xbuff, NULL));
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#ifdef SL_INCLUDE_CSLIP
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kfree(xchg(&sl->cbuff, NULL));
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slhc_free(xchg(&sl->slcomp, NULL));
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#endif
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}
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/*
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Reallocate slip channel buffers.
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*/
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static int sl_realloc_bufs(struct slip *sl, int mtu)
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{
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int err = 0;
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struct net_device *dev = sl->dev;
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unsigned char *xbuff, *rbuff;
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#ifdef SL_INCLUDE_CSLIP
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unsigned char *cbuff;
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#endif
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int len = mtu * 2;
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/*
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* allow for arrival of larger UDP packets, even if we say not to
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* also fixes a bug in which SunOS sends 512-byte packets even with
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* an MSS of 128
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*/
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if (len < 576 * 2)
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len = 576 * 2;
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xbuff = kmalloc(len + 4, GFP_ATOMIC);
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rbuff = kmalloc(len + 4, GFP_ATOMIC);
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#ifdef SL_INCLUDE_CSLIP
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cbuff = kmalloc(len + 4, GFP_ATOMIC);
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#endif
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#ifdef SL_INCLUDE_CSLIP
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if (xbuff == NULL || rbuff == NULL || cbuff == NULL) {
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#else
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if (xbuff == NULL || rbuff == NULL) {
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#endif
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if (mtu >= sl->mtu) {
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printk(KERN_WARNING "%s: unable to grow slip buffers, MTU change cancelled.\n",
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dev->name);
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err = -ENOBUFS;
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}
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goto done;
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}
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spin_lock_bh(&sl->lock);
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err = -ENODEV;
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if (sl->tty == NULL)
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goto done_on_bh;
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xbuff = xchg(&sl->xbuff, xbuff);
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rbuff = xchg(&sl->rbuff, rbuff);
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#ifdef SL_INCLUDE_CSLIP
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cbuff = xchg(&sl->cbuff, cbuff);
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#endif
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if (sl->xleft) {
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if (sl->xleft <= len) {
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memcpy(sl->xbuff, sl->xhead, sl->xleft);
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} else {
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sl->xleft = 0;
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sl->tx_dropped++;
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}
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}
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sl->xhead = sl->xbuff;
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if (sl->rcount) {
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if (sl->rcount <= len) {
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memcpy(sl->rbuff, rbuff, sl->rcount);
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} else {
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sl->rcount = 0;
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sl->rx_over_errors++;
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set_bit(SLF_ERROR, &sl->flags);
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}
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}
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sl->mtu = mtu;
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dev->mtu = mtu;
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sl->buffsize = len;
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err = 0;
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done_on_bh:
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spin_unlock_bh(&sl->lock);
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done:
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kfree(xbuff);
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kfree(rbuff);
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#ifdef SL_INCLUDE_CSLIP
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kfree(cbuff);
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#endif
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return err;
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}
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/* Set the "sending" flag. This must be atomic hence the set_bit. */
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static inline void
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sl_lock(struct slip *sl)
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{
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netif_stop_queue(sl->dev);
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}
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/* Clear the "sending" flag. This must be atomic, hence the ASM. */
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static inline void
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sl_unlock(struct slip *sl)
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{
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netif_wake_queue(sl->dev);
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}
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/* Send one completely decapsulated IP datagram to the IP layer. */
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static void
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sl_bump(struct slip *sl)
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{
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struct sk_buff *skb;
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int count;
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count = sl->rcount;
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#ifdef SL_INCLUDE_CSLIP
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if (sl->mode & (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) {
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unsigned char c;
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if ((c = sl->rbuff[0]) & SL_TYPE_COMPRESSED_TCP) {
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/* ignore compressed packets when CSLIP is off */
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if (!(sl->mode & SL_MODE_CSLIP)) {
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printk(KERN_WARNING "%s: compressed packet ignored\n", sl->dev->name);
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return;
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}
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/* make sure we've reserved enough space for uncompress to use */
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if (count + 80 > sl->buffsize) {
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sl->rx_over_errors++;
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return;
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}
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count = slhc_uncompress(sl->slcomp, sl->rbuff, count);
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if (count <= 0) {
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return;
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}
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} else if (c >= SL_TYPE_UNCOMPRESSED_TCP) {
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if (!(sl->mode & SL_MODE_CSLIP)) {
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/* turn on header compression */
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sl->mode |= SL_MODE_CSLIP;
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sl->mode &= ~SL_MODE_ADAPTIVE;
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printk(KERN_INFO "%s: header compression turned on\n", sl->dev->name);
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}
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sl->rbuff[0] &= 0x4f;
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if (slhc_remember(sl->slcomp, sl->rbuff, count) <= 0) {
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return;
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}
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}
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}
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#endif /* SL_INCLUDE_CSLIP */
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sl->rx_bytes+=count;
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skb = dev_alloc_skb(count);
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if (skb == NULL) {
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printk(KERN_WARNING "%s: memory squeeze, dropping packet.\n", sl->dev->name);
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sl->rx_dropped++;
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return;
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}
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skb->dev = sl->dev;
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memcpy(skb_put(skb,count), sl->rbuff, count);
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skb->mac.raw=skb->data;
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skb->protocol=htons(ETH_P_IP);
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netif_rx(skb);
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sl->dev->last_rx = jiffies;
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sl->rx_packets++;
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}
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/* Encapsulate one IP datagram and stuff into a TTY queue. */
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static void
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sl_encaps(struct slip *sl, unsigned char *icp, int len)
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{
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unsigned char *p;
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int actual, count;
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if (len > sl->mtu) { /* Sigh, shouldn't occur BUT ... */
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printk(KERN_WARNING "%s: truncating oversized transmit packet!\n", sl->dev->name);
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sl->tx_dropped++;
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sl_unlock(sl);
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return;
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}
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p = icp;
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#ifdef SL_INCLUDE_CSLIP
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if (sl->mode & SL_MODE_CSLIP) {
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len = slhc_compress(sl->slcomp, p, len, sl->cbuff, &p, 1);
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}
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#endif
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#ifdef CONFIG_SLIP_MODE_SLIP6
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if(sl->mode & SL_MODE_SLIP6)
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count = slip_esc6(p, (unsigned char *) sl->xbuff, len);
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else
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#endif
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count = slip_esc(p, (unsigned char *) sl->xbuff, len);
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/* Order of next two lines is *very* important.
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* When we are sending a little amount of data,
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* the transfer may be completed inside driver.write()
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* routine, because it's running with interrupts enabled.
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* In this case we *never* got WRITE_WAKEUP event,
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* if we did not request it before write operation.
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* 14 Oct 1994 Dmitry Gorodchanin.
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*/
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sl->tty->flags |= (1 << TTY_DO_WRITE_WAKEUP);
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actual = sl->tty->driver->write(sl->tty, sl->xbuff, count);
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#ifdef SL_CHECK_TRANSMIT
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sl->dev->trans_start = jiffies;
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#endif
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sl->xleft = count - actual;
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sl->xhead = sl->xbuff + actual;
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#ifdef CONFIG_SLIP_SMART
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/* VSV */
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clear_bit(SLF_OUTWAIT, &sl->flags); /* reset outfill flag */
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#endif
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}
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/*
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* Called by the driver when there's room for more data. If we have
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* more packets to send, we send them here.
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*/
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static void slip_write_wakeup(struct tty_struct *tty)
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{
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int actual;
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struct slip *sl = (struct slip *) tty->disc_data;
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/* First make sure we're connected. */
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if (!sl || sl->magic != SLIP_MAGIC || !netif_running(sl->dev)) {
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return;
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}
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if (sl->xleft <= 0) {
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/* Now serial buffer is almost free & we can start
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* transmission of another packet */
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sl->tx_packets++;
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tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
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sl_unlock(sl);
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return;
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}
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actual = tty->driver->write(tty, sl->xhead, sl->xleft);
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sl->xleft -= actual;
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sl->xhead += actual;
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}
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static void sl_tx_timeout(struct net_device *dev)
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{
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struct slip *sl = netdev_priv(dev);
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spin_lock(&sl->lock);
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if (netif_queue_stopped(dev)) {
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if (!netif_running(dev))
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goto out;
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/* May be we must check transmitter timeout here ?
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* 14 Oct 1994 Dmitry Gorodchanin.
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*/
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#ifdef SL_CHECK_TRANSMIT
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if (time_before(jiffies, dev->trans_start + 20 * HZ)) {
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/* 20 sec timeout not reached */
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goto out;
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}
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printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name,
|
|
(sl->tty->driver->chars_in_buffer(sl->tty) || sl->xleft) ?
|
|
"bad line quality" : "driver error");
|
|
sl->xleft = 0;
|
|
sl->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
|
|
sl_unlock(sl);
|
|
#endif
|
|
}
|
|
|
|
out:
|
|
spin_unlock(&sl->lock);
|
|
}
|
|
|
|
|
|
/* Encapsulate an IP datagram and kick it into a TTY queue. */
|
|
static int
|
|
sl_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct slip *sl = netdev_priv(dev);
|
|
|
|
spin_lock(&sl->lock);
|
|
if (!netif_running(dev)) {
|
|
spin_unlock(&sl->lock);
|
|
printk(KERN_WARNING "%s: xmit call when iface is down\n", dev->name);
|
|
dev_kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
if (sl->tty == NULL) {
|
|
spin_unlock(&sl->lock);
|
|
dev_kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
sl_lock(sl);
|
|
sl->tx_bytes+=skb->len;
|
|
sl_encaps(sl, skb->data, skb->len);
|
|
spin_unlock(&sl->lock);
|
|
|
|
dev_kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/******************************************
|
|
* Routines looking at netdevice side.
|
|
******************************************/
|
|
|
|
/* Netdevice UP -> DOWN routine */
|
|
|
|
static int
|
|
sl_close(struct net_device *dev)
|
|
{
|
|
struct slip *sl = netdev_priv(dev);
|
|
|
|
spin_lock_bh(&sl->lock);
|
|
if (sl->tty) {
|
|
/* TTY discipline is running. */
|
|
sl->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
|
|
}
|
|
netif_stop_queue(dev);
|
|
sl->rcount = 0;
|
|
sl->xleft = 0;
|
|
spin_unlock_bh(&sl->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Netdevice DOWN -> UP routine */
|
|
|
|
static int sl_open(struct net_device *dev)
|
|
{
|
|
struct slip *sl = netdev_priv(dev);
|
|
|
|
if (sl->tty==NULL)
|
|
return -ENODEV;
|
|
|
|
sl->flags &= (1 << SLF_INUSE);
|
|
netif_start_queue(dev);
|
|
return 0;
|
|
}
|
|
|
|
/* Netdevice change MTU request */
|
|
|
|
static int sl_change_mtu(struct net_device *dev, int new_mtu)
|
|
{
|
|
struct slip *sl = netdev_priv(dev);
|
|
|
|
if (new_mtu < 68 || new_mtu > 65534)
|
|
return -EINVAL;
|
|
|
|
if (new_mtu != dev->mtu)
|
|
return sl_realloc_bufs(sl, new_mtu);
|
|
return 0;
|
|
}
|
|
|
|
/* Netdevice get statistics request */
|
|
|
|
static struct net_device_stats *
|
|
sl_get_stats(struct net_device *dev)
|
|
{
|
|
static struct net_device_stats stats;
|
|
struct slip *sl = netdev_priv(dev);
|
|
#ifdef SL_INCLUDE_CSLIP
|
|
struct slcompress *comp;
|
|
#endif
|
|
|
|
memset(&stats, 0, sizeof(struct net_device_stats));
|
|
|
|
stats.rx_packets = sl->rx_packets;
|
|
stats.tx_packets = sl->tx_packets;
|
|
stats.rx_bytes = sl->rx_bytes;
|
|
stats.tx_bytes = sl->tx_bytes;
|
|
stats.rx_dropped = sl->rx_dropped;
|
|
stats.tx_dropped = sl->tx_dropped;
|
|
stats.tx_errors = sl->tx_errors;
|
|
stats.rx_errors = sl->rx_errors;
|
|
stats.rx_over_errors = sl->rx_over_errors;
|
|
#ifdef SL_INCLUDE_CSLIP
|
|
stats.rx_fifo_errors = sl->rx_compressed;
|
|
stats.tx_fifo_errors = sl->tx_compressed;
|
|
stats.collisions = sl->tx_misses;
|
|
comp = sl->slcomp;
|
|
if (comp) {
|
|
stats.rx_fifo_errors += comp->sls_i_compressed;
|
|
stats.rx_dropped += comp->sls_i_tossed;
|
|
stats.tx_fifo_errors += comp->sls_o_compressed;
|
|
stats.collisions += comp->sls_o_misses;
|
|
}
|
|
#endif /* CONFIG_INET */
|
|
return (&stats);
|
|
}
|
|
|
|
/* Netdevice register callback */
|
|
|
|
static int sl_init(struct net_device *dev)
|
|
{
|
|
struct slip *sl = netdev_priv(dev);
|
|
|
|
/*
|
|
* Finish setting up the DEVICE info.
|
|
*/
|
|
|
|
dev->mtu = sl->mtu;
|
|
dev->type = ARPHRD_SLIP + sl->mode;
|
|
#ifdef SL_CHECK_TRANSMIT
|
|
dev->tx_timeout = sl_tx_timeout;
|
|
dev->watchdog_timeo = 20*HZ;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void sl_uninit(struct net_device *dev)
|
|
{
|
|
struct slip *sl = netdev_priv(dev);
|
|
|
|
sl_free_bufs(sl);
|
|
}
|
|
|
|
static void sl_setup(struct net_device *dev)
|
|
{
|
|
dev->init = sl_init;
|
|
dev->uninit = sl_uninit;
|
|
dev->open = sl_open;
|
|
dev->destructor = free_netdev;
|
|
dev->stop = sl_close;
|
|
dev->get_stats = sl_get_stats;
|
|
dev->change_mtu = sl_change_mtu;
|
|
dev->hard_start_xmit = sl_xmit;
|
|
#ifdef CONFIG_SLIP_SMART
|
|
dev->do_ioctl = sl_ioctl;
|
|
#endif
|
|
dev->hard_header_len = 0;
|
|
dev->addr_len = 0;
|
|
dev->tx_queue_len = 10;
|
|
|
|
SET_MODULE_OWNER(dev);
|
|
|
|
/* New-style flags. */
|
|
dev->flags = IFF_NOARP|IFF_POINTOPOINT|IFF_MULTICAST;
|
|
}
|
|
|
|
/******************************************
|
|
Routines looking at TTY side.
|
|
******************************************/
|
|
|
|
|
|
/*
|
|
* Handle the 'receiver data ready' interrupt.
|
|
* This function is called by the 'tty_io' module in the kernel when
|
|
* a block of SLIP data has been received, which can now be decapsulated
|
|
* and sent on to some IP layer for further processing. This will not
|
|
* be re-entered while running but other ldisc functions may be called
|
|
* in parallel
|
|
*/
|
|
|
|
static void slip_receive_buf(struct tty_struct *tty, const unsigned char *cp, char *fp, int count)
|
|
{
|
|
struct slip *sl = (struct slip *) tty->disc_data;
|
|
|
|
if (!sl || sl->magic != SLIP_MAGIC ||
|
|
!netif_running(sl->dev))
|
|
return;
|
|
|
|
/* Read the characters out of the buffer */
|
|
while (count--) {
|
|
if (fp && *fp++) {
|
|
if (!test_and_set_bit(SLF_ERROR, &sl->flags)) {
|
|
sl->rx_errors++;
|
|
}
|
|
cp++;
|
|
continue;
|
|
}
|
|
#ifdef CONFIG_SLIP_MODE_SLIP6
|
|
if (sl->mode & SL_MODE_SLIP6)
|
|
slip_unesc6(sl, *cp++);
|
|
else
|
|
#endif
|
|
slip_unesc(sl, *cp++);
|
|
}
|
|
}
|
|
|
|
/************************************
|
|
* slip_open helper routines.
|
|
************************************/
|
|
|
|
/* Collect hanged up channels */
|
|
|
|
static void sl_sync(void)
|
|
{
|
|
int i;
|
|
struct net_device *dev;
|
|
struct slip *sl;
|
|
|
|
for (i = 0; i < slip_maxdev; i++) {
|
|
if ((dev = slip_devs[i]) == NULL)
|
|
break;
|
|
|
|
sl = netdev_priv(dev);
|
|
if (sl->tty || sl->leased)
|
|
continue;
|
|
if (dev->flags&IFF_UP)
|
|
dev_close(dev);
|
|
}
|
|
}
|
|
|
|
|
|
/* Find a free SLIP channel, and link in this `tty' line. */
|
|
static struct slip *
|
|
sl_alloc(dev_t line)
|
|
{
|
|
int i;
|
|
int sel = -1;
|
|
int score = -1;
|
|
struct net_device *dev = NULL;
|
|
struct slip *sl;
|
|
|
|
if (slip_devs == NULL)
|
|
return NULL; /* Master array missing ! */
|
|
|
|
for (i = 0; i < slip_maxdev; i++) {
|
|
dev = slip_devs[i];
|
|
if (dev == NULL)
|
|
break;
|
|
|
|
sl = netdev_priv(dev);
|
|
if (sl->leased) {
|
|
if (sl->line != line)
|
|
continue;
|
|
if (sl->tty)
|
|
return NULL;
|
|
|
|
/* Clear ESCAPE & ERROR flags */
|
|
sl->flags &= (1 << SLF_INUSE);
|
|
return sl;
|
|
}
|
|
|
|
if (sl->tty)
|
|
continue;
|
|
|
|
if (current->pid == sl->pid) {
|
|
if (sl->line == line && score < 3) {
|
|
sel = i;
|
|
score = 3;
|
|
continue;
|
|
}
|
|
if (score < 2) {
|
|
sel = i;
|
|
score = 2;
|
|
}
|
|
continue;
|
|
}
|
|
if (sl->line == line && score < 1) {
|
|
sel = i;
|
|
score = 1;
|
|
continue;
|
|
}
|
|
if (score < 0) {
|
|
sel = i;
|
|
score = 0;
|
|
}
|
|
}
|
|
|
|
if (sel >= 0) {
|
|
i = sel;
|
|
dev = slip_devs[i];
|
|
if (score > 1) {
|
|
sl = netdev_priv(dev);
|
|
sl->flags &= (1 << SLF_INUSE);
|
|
return sl;
|
|
}
|
|
}
|
|
|
|
/* Sorry, too many, all slots in use */
|
|
if (i >= slip_maxdev)
|
|
return NULL;
|
|
|
|
if (dev) {
|
|
sl = netdev_priv(dev);
|
|
if (test_bit(SLF_INUSE, &sl->flags)) {
|
|
unregister_netdevice(dev);
|
|
dev = NULL;
|
|
slip_devs[i] = NULL;
|
|
}
|
|
}
|
|
|
|
if (!dev) {
|
|
char name[IFNAMSIZ];
|
|
sprintf(name, "sl%d", i);
|
|
|
|
dev = alloc_netdev(sizeof(*sl), name, sl_setup);
|
|
if (!dev)
|
|
return NULL;
|
|
dev->base_addr = i;
|
|
}
|
|
|
|
sl = netdev_priv(dev);
|
|
|
|
/* Initialize channel control data */
|
|
sl->magic = SLIP_MAGIC;
|
|
sl->dev = dev;
|
|
spin_lock_init(&sl->lock);
|
|
sl->mode = SL_MODE_DEFAULT;
|
|
#ifdef CONFIG_SLIP_SMART
|
|
init_timer(&sl->keepalive_timer); /* initialize timer_list struct */
|
|
sl->keepalive_timer.data=(unsigned long)sl;
|
|
sl->keepalive_timer.function=sl_keepalive;
|
|
init_timer(&sl->outfill_timer);
|
|
sl->outfill_timer.data=(unsigned long)sl;
|
|
sl->outfill_timer.function=sl_outfill;
|
|
#endif
|
|
slip_devs[i] = dev;
|
|
|
|
return sl;
|
|
}
|
|
|
|
/*
|
|
* Open the high-level part of the SLIP channel.
|
|
* This function is called by the TTY module when the
|
|
* SLIP line discipline is called for. Because we are
|
|
* sure the tty line exists, we only have to link it to
|
|
* a free SLIP channel...
|
|
*
|
|
* Called in process context serialized from other ldisc calls.
|
|
*/
|
|
|
|
static int slip_open(struct tty_struct *tty)
|
|
{
|
|
struct slip *sl;
|
|
int err;
|
|
|
|
if(!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
/* RTnetlink lock is misused here to serialize concurrent
|
|
opens of slip channels. There are better ways, but it is
|
|
the simplest one.
|
|
*/
|
|
rtnl_lock();
|
|
|
|
/* Collect hanged up channels. */
|
|
sl_sync();
|
|
|
|
sl = (struct slip *) tty->disc_data;
|
|
|
|
err = -EEXIST;
|
|
/* First make sure we're not already connected. */
|
|
if (sl && sl->magic == SLIP_MAGIC)
|
|
goto err_exit;
|
|
|
|
/* OK. Find a free SLIP channel to use. */
|
|
err = -ENFILE;
|
|
if ((sl = sl_alloc(tty_devnum(tty))) == NULL)
|
|
goto err_exit;
|
|
|
|
sl->tty = tty;
|
|
tty->disc_data = sl;
|
|
sl->line = tty_devnum(tty);
|
|
sl->pid = current->pid;
|
|
|
|
if (!test_bit(SLF_INUSE, &sl->flags)) {
|
|
/* Perform the low-level SLIP initialization. */
|
|
if ((err = sl_alloc_bufs(sl, SL_MTU)) != 0)
|
|
goto err_free_chan;
|
|
|
|
set_bit(SLF_INUSE, &sl->flags);
|
|
|
|
if ((err = register_netdevice(sl->dev)))
|
|
goto err_free_bufs;
|
|
}
|
|
|
|
#ifdef CONFIG_SLIP_SMART
|
|
if (sl->keepalive) {
|
|
sl->keepalive_timer.expires=jiffies+sl->keepalive*HZ;
|
|
add_timer (&sl->keepalive_timer);
|
|
}
|
|
if (sl->outfill) {
|
|
sl->outfill_timer.expires=jiffies+sl->outfill*HZ;
|
|
add_timer (&sl->outfill_timer);
|
|
}
|
|
#endif
|
|
|
|
/* Done. We have linked the TTY line to a channel. */
|
|
rtnl_unlock();
|
|
tty->receive_room = 65536; /* We don't flow control */
|
|
return sl->dev->base_addr;
|
|
|
|
err_free_bufs:
|
|
sl_free_bufs(sl);
|
|
|
|
err_free_chan:
|
|
sl->tty = NULL;
|
|
tty->disc_data = NULL;
|
|
clear_bit(SLF_INUSE, &sl->flags);
|
|
|
|
err_exit:
|
|
rtnl_unlock();
|
|
|
|
/* Count references from TTY module */
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
|
|
FIXME: 1,2 are fixed 3 was never true anyway.
|
|
|
|
Let me to blame a bit.
|
|
1. TTY module calls this funstion on soft interrupt.
|
|
2. TTY module calls this function WITH MASKED INTERRUPTS!
|
|
3. TTY module does not notify us about line discipline
|
|
shutdown,
|
|
|
|
Seems, now it is clean. The solution is to consider netdevice and
|
|
line discipline sides as two independent threads.
|
|
|
|
By-product (not desired): sl? does not feel hangups and remains open.
|
|
It is supposed, that user level program (dip, diald, slattach...)
|
|
will catch SIGHUP and make the rest of work.
|
|
|
|
I see no way to make more with current tty code. --ANK
|
|
*/
|
|
|
|
/*
|
|
* Close down a SLIP channel.
|
|
* This means flushing out any pending queues, and then returning. This
|
|
* call is serialized against other ldisc functions.
|
|
*/
|
|
static void
|
|
slip_close(struct tty_struct *tty)
|
|
{
|
|
struct slip *sl = (struct slip *) tty->disc_data;
|
|
|
|
/* First make sure we're connected. */
|
|
if (!sl || sl->magic != SLIP_MAGIC || sl->tty != tty)
|
|
return;
|
|
|
|
tty->disc_data = NULL;
|
|
sl->tty = NULL;
|
|
if (!sl->leased)
|
|
sl->line = 0;
|
|
|
|
/* VSV = very important to remove timers */
|
|
#ifdef CONFIG_SLIP_SMART
|
|
del_timer_sync(&sl->keepalive_timer);
|
|
del_timer_sync(&sl->outfill_timer);
|
|
#endif
|
|
|
|
/* Count references from TTY module */
|
|
}
|
|
|
|
/************************************************************************
|
|
* STANDARD SLIP ENCAPSULATION *
|
|
************************************************************************/
|
|
|
|
int
|
|
slip_esc(unsigned char *s, unsigned char *d, int len)
|
|
{
|
|
unsigned char *ptr = d;
|
|
unsigned char c;
|
|
|
|
/*
|
|
* Send an initial END character to flush out any
|
|
* data that may have accumulated in the receiver
|
|
* due to line noise.
|
|
*/
|
|
|
|
*ptr++ = END;
|
|
|
|
/*
|
|
* For each byte in the packet, send the appropriate
|
|
* character sequence, according to the SLIP protocol.
|
|
*/
|
|
|
|
while (len-- > 0) {
|
|
switch(c = *s++) {
|
|
case END:
|
|
*ptr++ = ESC;
|
|
*ptr++ = ESC_END;
|
|
break;
|
|
case ESC:
|
|
*ptr++ = ESC;
|
|
*ptr++ = ESC_ESC;
|
|
break;
|
|
default:
|
|
*ptr++ = c;
|
|
break;
|
|
}
|
|
}
|
|
*ptr++ = END;
|
|
return (ptr - d);
|
|
}
|
|
|
|
static void slip_unesc(struct slip *sl, unsigned char s)
|
|
{
|
|
|
|
switch(s) {
|
|
case END:
|
|
#ifdef CONFIG_SLIP_SMART
|
|
/* drop keeptest bit = VSV */
|
|
if (test_bit(SLF_KEEPTEST, &sl->flags))
|
|
clear_bit(SLF_KEEPTEST, &sl->flags);
|
|
#endif
|
|
|
|
if (!test_and_clear_bit(SLF_ERROR, &sl->flags) && (sl->rcount > 2)) {
|
|
sl_bump(sl);
|
|
}
|
|
clear_bit(SLF_ESCAPE, &sl->flags);
|
|
sl->rcount = 0;
|
|
return;
|
|
|
|
case ESC:
|
|
set_bit(SLF_ESCAPE, &sl->flags);
|
|
return;
|
|
case ESC_ESC:
|
|
if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) {
|
|
s = ESC;
|
|
}
|
|
break;
|
|
case ESC_END:
|
|
if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) {
|
|
s = END;
|
|
}
|
|
break;
|
|
}
|
|
if (!test_bit(SLF_ERROR, &sl->flags)) {
|
|
if (sl->rcount < sl->buffsize) {
|
|
sl->rbuff[sl->rcount++] = s;
|
|
return;
|
|
}
|
|
sl->rx_over_errors++;
|
|
set_bit(SLF_ERROR, &sl->flags);
|
|
}
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_SLIP_MODE_SLIP6
|
|
/************************************************************************
|
|
* 6 BIT SLIP ENCAPSULATION *
|
|
************************************************************************/
|
|
|
|
int
|
|
slip_esc6(unsigned char *s, unsigned char *d, int len)
|
|
{
|
|
unsigned char *ptr = d;
|
|
unsigned char c;
|
|
int i;
|
|
unsigned short v = 0;
|
|
short bits = 0;
|
|
|
|
/*
|
|
* Send an initial END character to flush out any
|
|
* data that may have accumulated in the receiver
|
|
* due to line noise.
|
|
*/
|
|
|
|
*ptr++ = 0x70;
|
|
|
|
/*
|
|
* Encode the packet into printable ascii characters
|
|
*/
|
|
|
|
for (i = 0; i < len; ++i) {
|
|
v = (v << 8) | s[i];
|
|
bits += 8;
|
|
while (bits >= 6) {
|
|
bits -= 6;
|
|
c = 0x30 + ((v >> bits) & 0x3F);
|
|
*ptr++ = c;
|
|
}
|
|
}
|
|
if (bits) {
|
|
c = 0x30 + ((v << (6 - bits)) & 0x3F);
|
|
*ptr++ = c;
|
|
}
|
|
*ptr++ = 0x70;
|
|
return ptr - d;
|
|
}
|
|
|
|
void
|
|
slip_unesc6(struct slip *sl, unsigned char s)
|
|
{
|
|
unsigned char c;
|
|
|
|
if (s == 0x70) {
|
|
#ifdef CONFIG_SLIP_SMART
|
|
/* drop keeptest bit = VSV */
|
|
if (test_bit(SLF_KEEPTEST, &sl->flags))
|
|
clear_bit(SLF_KEEPTEST, &sl->flags);
|
|
#endif
|
|
|
|
if (!test_and_clear_bit(SLF_ERROR, &sl->flags) && (sl->rcount > 2)) {
|
|
sl_bump(sl);
|
|
}
|
|
sl->rcount = 0;
|
|
sl->xbits = 0;
|
|
sl->xdata = 0;
|
|
} else if (s >= 0x30 && s < 0x70) {
|
|
sl->xdata = (sl->xdata << 6) | ((s - 0x30) & 0x3F);
|
|
sl->xbits += 6;
|
|
if (sl->xbits >= 8) {
|
|
sl->xbits -= 8;
|
|
c = (unsigned char)(sl->xdata >> sl->xbits);
|
|
if (!test_bit(SLF_ERROR, &sl->flags)) {
|
|
if (sl->rcount < sl->buffsize) {
|
|
sl->rbuff[sl->rcount++] = c;
|
|
return;
|
|
}
|
|
sl->rx_over_errors++;
|
|
set_bit(SLF_ERROR, &sl->flags);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#endif /* CONFIG_SLIP_MODE_SLIP6 */
|
|
|
|
/* Perform I/O control on an active SLIP channel. */
|
|
static int slip_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct slip *sl = (struct slip *) tty->disc_data;
|
|
unsigned int tmp;
|
|
int __user *p = (int __user *)arg;
|
|
|
|
/* First make sure we're connected. */
|
|
if (!sl || sl->magic != SLIP_MAGIC) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
switch(cmd) {
|
|
case SIOCGIFNAME:
|
|
tmp = strlen(sl->dev->name) + 1;
|
|
if (copy_to_user((void __user *)arg, sl->dev->name, tmp))
|
|
return -EFAULT;
|
|
return 0;
|
|
|
|
case SIOCGIFENCAP:
|
|
if (put_user(sl->mode, p))
|
|
return -EFAULT;
|
|
return 0;
|
|
|
|
case SIOCSIFENCAP:
|
|
if (get_user(tmp, p))
|
|
return -EFAULT;
|
|
#ifndef SL_INCLUDE_CSLIP
|
|
if (tmp & (SL_MODE_CSLIP|SL_MODE_ADAPTIVE)) {
|
|
return -EINVAL;
|
|
}
|
|
#else
|
|
if ((tmp & (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) ==
|
|
(SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) {
|
|
/* return -EINVAL; */
|
|
tmp &= ~SL_MODE_ADAPTIVE;
|
|
}
|
|
#endif
|
|
#ifndef CONFIG_SLIP_MODE_SLIP6
|
|
if (tmp & SL_MODE_SLIP6) {
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
sl->mode = tmp;
|
|
sl->dev->type = ARPHRD_SLIP+sl->mode;
|
|
return 0;
|
|
|
|
case SIOCSIFHWADDR:
|
|
return -EINVAL;
|
|
|
|
#ifdef CONFIG_SLIP_SMART
|
|
/* VSV changes start here */
|
|
case SIOCSKEEPALIVE:
|
|
if (get_user(tmp, p))
|
|
return -EFAULT;
|
|
if (tmp > 255) /* max for unchar */
|
|
return -EINVAL;
|
|
|
|
spin_lock_bh(&sl->lock);
|
|
if (!sl->tty) {
|
|
spin_unlock_bh(&sl->lock);
|
|
return -ENODEV;
|
|
}
|
|
if ((sl->keepalive = (unchar) tmp) != 0) {
|
|
mod_timer(&sl->keepalive_timer, jiffies+sl->keepalive*HZ);
|
|
set_bit(SLF_KEEPTEST, &sl->flags);
|
|
} else {
|
|
del_timer (&sl->keepalive_timer);
|
|
}
|
|
spin_unlock_bh(&sl->lock);
|
|
return 0;
|
|
|
|
case SIOCGKEEPALIVE:
|
|
if (put_user(sl->keepalive, p))
|
|
return -EFAULT;
|
|
return 0;
|
|
|
|
case SIOCSOUTFILL:
|
|
if (get_user(tmp, p))
|
|
return -EFAULT;
|
|
if (tmp > 255) /* max for unchar */
|
|
return -EINVAL;
|
|
spin_lock_bh(&sl->lock);
|
|
if (!sl->tty) {
|
|
spin_unlock_bh(&sl->lock);
|
|
return -ENODEV;
|
|
}
|
|
if ((sl->outfill = (unchar) tmp) != 0){
|
|
mod_timer(&sl->outfill_timer, jiffies+sl->outfill*HZ);
|
|
set_bit(SLF_OUTWAIT, &sl->flags);
|
|
} else {
|
|
del_timer (&sl->outfill_timer);
|
|
}
|
|
spin_unlock_bh(&sl->lock);
|
|
return 0;
|
|
|
|
case SIOCGOUTFILL:
|
|
if (put_user(sl->outfill, p))
|
|
return -EFAULT;
|
|
return 0;
|
|
/* VSV changes end */
|
|
#endif
|
|
|
|
/* Allow stty to read, but not set, the serial port */
|
|
case TCGETS:
|
|
case TCGETA:
|
|
return n_tty_ioctl(tty, file, cmd, arg);
|
|
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
}
|
|
|
|
/* VSV changes start here */
|
|
#ifdef CONFIG_SLIP_SMART
|
|
/* function do_ioctl called from net/core/dev.c
|
|
to allow get/set outfill/keepalive parameter
|
|
by ifconfig */
|
|
|
|
static int sl_ioctl(struct net_device *dev,struct ifreq *rq,int cmd)
|
|
{
|
|
struct slip *sl = netdev_priv(dev);
|
|
unsigned long *p = (unsigned long *)&rq->ifr_ifru;
|
|
|
|
if (sl == NULL) /* Allocation failed ?? */
|
|
return -ENODEV;
|
|
|
|
spin_lock_bh(&sl->lock);
|
|
|
|
if (!sl->tty) {
|
|
spin_unlock_bh(&sl->lock);
|
|
return -ENODEV;
|
|
}
|
|
|
|
switch(cmd){
|
|
case SIOCSKEEPALIVE:
|
|
/* max for unchar */
|
|
if ((unsigned)*p > 255) {
|
|
spin_unlock_bh(&sl->lock);
|
|
return -EINVAL;
|
|
}
|
|
sl->keepalive = (unchar) *p;
|
|
if (sl->keepalive != 0) {
|
|
sl->keepalive_timer.expires=jiffies+sl->keepalive*HZ;
|
|
mod_timer(&sl->keepalive_timer, jiffies+sl->keepalive*HZ);
|
|
set_bit(SLF_KEEPTEST, &sl->flags);
|
|
} else {
|
|
del_timer(&sl->keepalive_timer);
|
|
}
|
|
break;
|
|
|
|
case SIOCGKEEPALIVE:
|
|
*p = sl->keepalive;
|
|
break;
|
|
|
|
case SIOCSOUTFILL:
|
|
if ((unsigned)*p > 255) { /* max for unchar */
|
|
spin_unlock_bh(&sl->lock);
|
|
return -EINVAL;
|
|
}
|
|
if ((sl->outfill = (unchar)*p) != 0){
|
|
mod_timer(&sl->outfill_timer, jiffies+sl->outfill*HZ);
|
|
set_bit(SLF_OUTWAIT, &sl->flags);
|
|
} else {
|
|
del_timer (&sl->outfill_timer);
|
|
}
|
|
break;
|
|
|
|
case SIOCGOUTFILL:
|
|
*p = sl->outfill;
|
|
break;
|
|
|
|
case SIOCSLEASE:
|
|
/* Resolve race condition, when ioctl'ing hanged up
|
|
and opened by another process device.
|
|
*/
|
|
if (sl->tty != current->signal->tty && sl->pid != current->pid) {
|
|
spin_unlock_bh(&sl->lock);
|
|
return -EPERM;
|
|
}
|
|
sl->leased = 0;
|
|
if (*p)
|
|
sl->leased = 1;
|
|
break;
|
|
|
|
case SIOCGLEASE:
|
|
*p = sl->leased;
|
|
};
|
|
spin_unlock_bh(&sl->lock);
|
|
return 0;
|
|
}
|
|
#endif
|
|
/* VSV changes end */
|
|
|
|
static struct tty_ldisc sl_ldisc = {
|
|
.owner = THIS_MODULE,
|
|
.magic = TTY_LDISC_MAGIC,
|
|
.name = "slip",
|
|
.open = slip_open,
|
|
.close = slip_close,
|
|
.ioctl = slip_ioctl,
|
|
.receive_buf = slip_receive_buf,
|
|
.write_wakeup = slip_write_wakeup,
|
|
};
|
|
|
|
static int __init slip_init(void)
|
|
{
|
|
int status;
|
|
|
|
if (slip_maxdev < 4)
|
|
slip_maxdev = 4; /* Sanity */
|
|
|
|
printk(KERN_INFO "SLIP: version %s (dynamic channels, max=%d)"
|
|
#ifdef CONFIG_SLIP_MODE_SLIP6
|
|
" (6 bit encapsulation enabled)"
|
|
#endif
|
|
".\n",
|
|
SLIP_VERSION, slip_maxdev );
|
|
#if defined(SL_INCLUDE_CSLIP)
|
|
printk(KERN_INFO "CSLIP: code copyright 1989 Regents of the University of California.\n");
|
|
#endif
|
|
#ifdef CONFIG_SLIP_SMART
|
|
printk(KERN_INFO "SLIP linefill/keepalive option.\n");
|
|
#endif
|
|
|
|
slip_devs = kmalloc(sizeof(struct net_device *)*slip_maxdev, GFP_KERNEL);
|
|
if (!slip_devs) {
|
|
printk(KERN_ERR "SLIP: Can't allocate slip devices array! Uaargh! (-> No SLIP available)\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Clear the pointer array, we allocate devices when we need them */
|
|
memset(slip_devs, 0, sizeof(struct net_device *)*slip_maxdev);
|
|
|
|
/* Fill in our line protocol discipline, and register it */
|
|
if ((status = tty_register_ldisc(N_SLIP, &sl_ldisc)) != 0) {
|
|
printk(KERN_ERR "SLIP: can't register line discipline (err = %d)\n", status);
|
|
kfree(slip_devs);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
static void __exit slip_exit(void)
|
|
{
|
|
int i;
|
|
struct net_device *dev;
|
|
struct slip *sl;
|
|
unsigned long timeout = jiffies + HZ;
|
|
int busy = 0;
|
|
|
|
if (slip_devs == NULL)
|
|
return;
|
|
|
|
/* First of all: check for active disciplines and hangup them.
|
|
*/
|
|
do {
|
|
if (busy)
|
|
msleep_interruptible(100);
|
|
|
|
busy = 0;
|
|
for (i = 0; i < slip_maxdev; i++) {
|
|
dev = slip_devs[i];
|
|
if (!dev)
|
|
continue;
|
|
sl = netdev_priv(dev);
|
|
spin_lock_bh(&sl->lock);
|
|
if (sl->tty) {
|
|
busy++;
|
|
tty_hangup(sl->tty);
|
|
}
|
|
spin_unlock_bh(&sl->lock);
|
|
}
|
|
} while (busy && time_before(jiffies, timeout));
|
|
|
|
|
|
for (i = 0; i < slip_maxdev; i++) {
|
|
dev = slip_devs[i];
|
|
if (!dev)
|
|
continue;
|
|
slip_devs[i] = NULL;
|
|
|
|
sl = netdev_priv(dev);
|
|
if (sl->tty) {
|
|
printk(KERN_ERR "%s: tty discipline still running\n",
|
|
dev->name);
|
|
/* Intentionally leak the control block. */
|
|
dev->destructor = NULL;
|
|
}
|
|
|
|
unregister_netdev(dev);
|
|
}
|
|
|
|
kfree(slip_devs);
|
|
slip_devs = NULL;
|
|
|
|
if ((i = tty_unregister_ldisc(N_SLIP)))
|
|
{
|
|
printk(KERN_ERR "SLIP: can't unregister line discipline (err = %d)\n", i);
|
|
}
|
|
}
|
|
|
|
module_init(slip_init);
|
|
module_exit(slip_exit);
|
|
|
|
#ifdef CONFIG_SLIP_SMART
|
|
/*
|
|
* This is start of the code for multislip style line checking
|
|
* added by Stanislav Voronyi. All changes before marked VSV
|
|
*/
|
|
|
|
static void sl_outfill(unsigned long sls)
|
|
{
|
|
struct slip *sl=(struct slip *)sls;
|
|
|
|
spin_lock(&sl->lock);
|
|
|
|
if (sl->tty == NULL)
|
|
goto out;
|
|
|
|
if(sl->outfill)
|
|
{
|
|
if( test_bit(SLF_OUTWAIT, &sl->flags) )
|
|
{
|
|
/* no packets were transmitted, do outfill */
|
|
#ifdef CONFIG_SLIP_MODE_SLIP6
|
|
unsigned char s = (sl->mode & SL_MODE_SLIP6)?0x70:END;
|
|
#else
|
|
unsigned char s = END;
|
|
#endif
|
|
/* put END into tty queue. Is it right ??? */
|
|
if (!netif_queue_stopped(sl->dev))
|
|
{
|
|
/* if device busy no outfill */
|
|
sl->tty->driver->write(sl->tty, &s, 1);
|
|
}
|
|
}
|
|
else
|
|
set_bit(SLF_OUTWAIT, &sl->flags);
|
|
|
|
mod_timer(&sl->outfill_timer, jiffies+sl->outfill*HZ);
|
|
}
|
|
out:
|
|
spin_unlock(&sl->lock);
|
|
}
|
|
|
|
static void sl_keepalive(unsigned long sls)
|
|
{
|
|
struct slip *sl=(struct slip *)sls;
|
|
|
|
spin_lock(&sl->lock);
|
|
|
|
if (sl->tty == NULL)
|
|
goto out;
|
|
|
|
if( sl->keepalive)
|
|
{
|
|
if(test_bit(SLF_KEEPTEST, &sl->flags))
|
|
{
|
|
/* keepalive still high :(, we must hangup */
|
|
if( sl->outfill ) /* outfill timer must be deleted too */
|
|
(void)del_timer(&sl->outfill_timer);
|
|
printk(KERN_DEBUG "%s: no packets received during keepalive timeout, hangup.\n", sl->dev->name);
|
|
tty_hangup(sl->tty); /* this must hangup tty & close slip */
|
|
/* I think we need not something else */
|
|
goto out;
|
|
}
|
|
else
|
|
set_bit(SLF_KEEPTEST, &sl->flags);
|
|
|
|
mod_timer(&sl->keepalive_timer, jiffies+sl->keepalive*HZ);
|
|
}
|
|
|
|
out:
|
|
spin_unlock(&sl->lock);
|
|
}
|
|
|
|
#endif
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_LDISC(N_SLIP);
|