/*
- * MKISS Driver
+ * This program is free software; you can distribute it and/or modify it
+ * under the terms of the GNU General Public License (Version 2) as
+ * published by the Free Software Foundation.
*
- * This module:
- * This module 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.
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
*
- * This module implements the AX.25 protocol for kernel-based
- * devices like TTYs. It interfaces between a raw TTY, and the
- * kernel's AX.25 protocol layers, just like slip.c.
- * AX.25 needs to be separated from slip.c while slip.c is no
- * longer a static kernel device since it is a module.
- * This method clears the way to implement other kiss protocols
- * like mkiss smack g8bpq ..... so far only mkiss is implemented.
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
- * Hans Alblas <hans@esrac.ele.tue.nl>
- *
- * History
- * Jonathan (G4KLX) Fixed to match Linux networking changes - 2.1.15.
- * Matthias (DG2FEF) Added support for FlexNet CRC (on special request)
- * Fixed bug in ax25_close(): dev_lock_wait() was
- * called twice, causing a deadlock.
- * Jeroen (PE1RXQ) Removed old MKISS_MAGIC stuff and calls to
- * MOD_*_USE_COUNT
- * Remove cli() and fix rtnl lock usage.
+ * Copyright (C) Hans Alblas PE1AYX <hans@esrac.ele.tue.nl>
+ * Copyright (C) 2004, 05 Ralf Baechle DL5RB <ralf@linux-mips.org>
+ * Copyright (C) 2004, 05 Thomas Osterried DL9SAU <thomas@x-berg.in-berlin.de>
*/
-
#include <linux/config.h>
#include <linux/module.h>
#include <asm/system.h>
#include <linux/bitops.h>
#include <asm/uaccess.h>
+#include <linux/crc16.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
+#include <linux/jiffies.h>
#include <net/ax25.h>
-#include "mkiss.h"
+#define AX_MTU 236
+
+/* SLIP/KISS protocol characters. */
+#define END 0300 /* indicates end of frame */
+#define ESC 0333 /* indicates byte stuffing */
+#define ESC_END 0334 /* ESC ESC_END means END 'data' */
+#define ESC_ESC 0335 /* ESC ESC_ESC means ESC 'data' */
+
+struct mkiss {
+ struct tty_struct *tty; /* ptr to TTY structure */
+ struct net_device *dev; /* easy for intr handling */
+
+ /* These are pointers to the malloc()ed frame buffers. */
+ spinlock_t buflock;/* lock for rbuf and xbuf */
+ unsigned char *rbuff; /* receiver buffer */
+ int rcount; /* received chars counter */
+ unsigned char *xbuff; /* transmitter buffer */
+ unsigned char *xhead; /* pointer to next byte to XMIT */
+ int xleft; /* bytes left in XMIT queue */
+
+ struct net_device_stats stats;
+
+ /* Detailed SLIP statistics. */
+ int mtu; /* Our mtu (to spot changes!) */
+ int buffsize; /* Max buffers sizes */
+
+ unsigned long flags; /* Flag values/ mode etc */
+ /* long req'd: used by set_bit --RR */
+#define AXF_INUSE 0 /* Channel in use */
+#define AXF_ESCAPE 1 /* ESC received */
+#define AXF_ERROR 2 /* Parity, etc. error */
+#define AXF_KEEPTEST 3 /* Keepalive test flag */
+#define AXF_OUTWAIT 4 /* is outpacket was flag */
+
+ int mode;
+ int crcmode; /* MW: for FlexNet, SMACK etc. */
+ int crcauto; /* CRC auto mode */
+
+#define CRC_MODE_NONE 0
+#define CRC_MODE_FLEX 1
+#define CRC_MODE_SMACK 2
+#define CRC_MODE_FLEX_TEST 3
+#define CRC_MODE_SMACK_TEST 4
+
+ atomic_t refcnt;
+ struct semaphore dead_sem;
+};
-#ifdef CONFIG_INET
-#include <linux/ip.h>
-#include <linux/tcp.h>
-#endif
+/*---------------------------------------------------------------------------*/
-static char banner[] __initdata = KERN_INFO "mkiss: AX.25 Multikiss, Hans Albas PE1AYX\n";
+static const unsigned short crc_flex_table[] = {
+ 0x0f87, 0x1e0e, 0x2c95, 0x3d1c, 0x49a3, 0x582a, 0x6ab1, 0x7b38,
+ 0x83cf, 0x9246, 0xa0dd, 0xb154, 0xc5eb, 0xd462, 0xe6f9, 0xf770,
+ 0x1f06, 0x0e8f, 0x3c14, 0x2d9d, 0x5922, 0x48ab, 0x7a30, 0x6bb9,
+ 0x934e, 0x82c7, 0xb05c, 0xa1d5, 0xd56a, 0xc4e3, 0xf678, 0xe7f1,
+ 0x2e85, 0x3f0c, 0x0d97, 0x1c1e, 0x68a1, 0x7928, 0x4bb3, 0x5a3a,
+ 0xa2cd, 0xb344, 0x81df, 0x9056, 0xe4e9, 0xf560, 0xc7fb, 0xd672,
+ 0x3e04, 0x2f8d, 0x1d16, 0x0c9f, 0x7820, 0x69a9, 0x5b32, 0x4abb,
+ 0xb24c, 0xa3c5, 0x915e, 0x80d7, 0xf468, 0xe5e1, 0xd77a, 0xc6f3,
+ 0x4d83, 0x5c0a, 0x6e91, 0x7f18, 0x0ba7, 0x1a2e, 0x28b5, 0x393c,
+ 0xc1cb, 0xd042, 0xe2d9, 0xf350, 0x87ef, 0x9666, 0xa4fd, 0xb574,
+ 0x5d02, 0x4c8b, 0x7e10, 0x6f99, 0x1b26, 0x0aaf, 0x3834, 0x29bd,
+ 0xd14a, 0xc0c3, 0xf258, 0xe3d1, 0x976e, 0x86e7, 0xb47c, 0xa5f5,
+ 0x6c81, 0x7d08, 0x4f93, 0x5e1a, 0x2aa5, 0x3b2c, 0x09b7, 0x183e,
+ 0xe0c9, 0xf140, 0xc3db, 0xd252, 0xa6ed, 0xb764, 0x85ff, 0x9476,
+ 0x7c00, 0x6d89, 0x5f12, 0x4e9b, 0x3a24, 0x2bad, 0x1936, 0x08bf,
+ 0xf048, 0xe1c1, 0xd35a, 0xc2d3, 0xb66c, 0xa7e5, 0x957e, 0x84f7,
+ 0x8b8f, 0x9a06, 0xa89d, 0xb914, 0xcdab, 0xdc22, 0xeeb9, 0xff30,
+ 0x07c7, 0x164e, 0x24d5, 0x355c, 0x41e3, 0x506a, 0x62f1, 0x7378,
+ 0x9b0e, 0x8a87, 0xb81c, 0xa995, 0xdd2a, 0xcca3, 0xfe38, 0xefb1,
+ 0x1746, 0x06cf, 0x3454, 0x25dd, 0x5162, 0x40eb, 0x7270, 0x63f9,
+ 0xaa8d, 0xbb04, 0x899f, 0x9816, 0xeca9, 0xfd20, 0xcfbb, 0xde32,
+ 0x26c5, 0x374c, 0x05d7, 0x145e, 0x60e1, 0x7168, 0x43f3, 0x527a,
+ 0xba0c, 0xab85, 0x991e, 0x8897, 0xfc28, 0xeda1, 0xdf3a, 0xceb3,
+ 0x3644, 0x27cd, 0x1556, 0x04df, 0x7060, 0x61e9, 0x5372, 0x42fb,
+ 0xc98b, 0xd802, 0xea99, 0xfb10, 0x8faf, 0x9e26, 0xacbd, 0xbd34,
+ 0x45c3, 0x544a, 0x66d1, 0x7758, 0x03e7, 0x126e, 0x20f5, 0x317c,
+ 0xd90a, 0xc883, 0xfa18, 0xeb91, 0x9f2e, 0x8ea7, 0xbc3c, 0xadb5,
+ 0x5542, 0x44cb, 0x7650, 0x67d9, 0x1366, 0x02ef, 0x3074, 0x21fd,
+ 0xe889, 0xf900, 0xcb9b, 0xda12, 0xaead, 0xbf24, 0x8dbf, 0x9c36,
+ 0x64c1, 0x7548, 0x47d3, 0x565a, 0x22e5, 0x336c, 0x01f7, 0x107e,
+ 0xf808, 0xe981, 0xdb1a, 0xca93, 0xbe2c, 0xafa5, 0x9d3e, 0x8cb7,
+ 0x7440, 0x65c9, 0x5752, 0x46db, 0x3264, 0x23ed, 0x1176, 0x00ff
+};
-typedef struct ax25_ctrl {
- struct ax_disp ctrl; /* */
- struct net_device dev; /* the device */
-} ax25_ctrl_t;
+static unsigned short calc_crc_flex(unsigned char *cp, int size)
+{
+ unsigned short crc = 0xffff;
-static ax25_ctrl_t **ax25_ctrls;
+ while (size--)
+ crc = (crc << 8) ^ crc_flex_table[((crc >> 8) ^ *cp++) & 0xff];
-int ax25_maxdev = AX25_MAXDEV; /* Can be overridden with insmod! */
+ return crc;
+}
-static struct tty_ldisc ax_ldisc;
+static int check_crc_flex(unsigned char *cp, int size)
+{
+ unsigned short crc = 0xffff;
-static int ax25_init(struct net_device *);
-static int kiss_esc(unsigned char *, unsigned char *, int);
-static int kiss_esc_crc(unsigned char *, unsigned char *, unsigned short, int);
-static void kiss_unesc(struct ax_disp *, unsigned char);
+ if (size < 3)
+ return -1;
-/*---------------------------------------------------------------------------*/
+ while (size--)
+ crc = (crc << 8) ^ crc_flex_table[((crc >> 8) ^ *cp++) & 0xff];
-static const unsigned short Crc_flex_table[] = {
- 0x0f87, 0x1e0e, 0x2c95, 0x3d1c, 0x49a3, 0x582a, 0x6ab1, 0x7b38,
- 0x83cf, 0x9246, 0xa0dd, 0xb154, 0xc5eb, 0xd462, 0xe6f9, 0xf770,
- 0x1f06, 0x0e8f, 0x3c14, 0x2d9d, 0x5922, 0x48ab, 0x7a30, 0x6bb9,
- 0x934e, 0x82c7, 0xb05c, 0xa1d5, 0xd56a, 0xc4e3, 0xf678, 0xe7f1,
- 0x2e85, 0x3f0c, 0x0d97, 0x1c1e, 0x68a1, 0x7928, 0x4bb3, 0x5a3a,
- 0xa2cd, 0xb344, 0x81df, 0x9056, 0xe4e9, 0xf560, 0xc7fb, 0xd672,
- 0x3e04, 0x2f8d, 0x1d16, 0x0c9f, 0x7820, 0x69a9, 0x5b32, 0x4abb,
- 0xb24c, 0xa3c5, 0x915e, 0x80d7, 0xf468, 0xe5e1, 0xd77a, 0xc6f3,
- 0x4d83, 0x5c0a, 0x6e91, 0x7f18, 0x0ba7, 0x1a2e, 0x28b5, 0x393c,
- 0xc1cb, 0xd042, 0xe2d9, 0xf350, 0x87ef, 0x9666, 0xa4fd, 0xb574,
- 0x5d02, 0x4c8b, 0x7e10, 0x6f99, 0x1b26, 0x0aaf, 0x3834, 0x29bd,
- 0xd14a, 0xc0c3, 0xf258, 0xe3d1, 0x976e, 0x86e7, 0xb47c, 0xa5f5,
- 0x6c81, 0x7d08, 0x4f93, 0x5e1a, 0x2aa5, 0x3b2c, 0x09b7, 0x183e,
- 0xe0c9, 0xf140, 0xc3db, 0xd252, 0xa6ed, 0xb764, 0x85ff, 0x9476,
- 0x7c00, 0x6d89, 0x5f12, 0x4e9b, 0x3a24, 0x2bad, 0x1936, 0x08bf,
- 0xf048, 0xe1c1, 0xd35a, 0xc2d3, 0xb66c, 0xa7e5, 0x957e, 0x84f7,
- 0x8b8f, 0x9a06, 0xa89d, 0xb914, 0xcdab, 0xdc22, 0xeeb9, 0xff30,
- 0x07c7, 0x164e, 0x24d5, 0x355c, 0x41e3, 0x506a, 0x62f1, 0x7378,
- 0x9b0e, 0x8a87, 0xb81c, 0xa995, 0xdd2a, 0xcca3, 0xfe38, 0xefb1,
- 0x1746, 0x06cf, 0x3454, 0x25dd, 0x5162, 0x40eb, 0x7270, 0x63f9,
- 0xaa8d, 0xbb04, 0x899f, 0x9816, 0xeca9, 0xfd20, 0xcfbb, 0xde32,
- 0x26c5, 0x374c, 0x05d7, 0x145e, 0x60e1, 0x7168, 0x43f3, 0x527a,
- 0xba0c, 0xab85, 0x991e, 0x8897, 0xfc28, 0xeda1, 0xdf3a, 0xceb3,
- 0x3644, 0x27cd, 0x1556, 0x04df, 0x7060, 0x61e9, 0x5372, 0x42fb,
- 0xc98b, 0xd802, 0xea99, 0xfb10, 0x8faf, 0x9e26, 0xacbd, 0xbd34,
- 0x45c3, 0x544a, 0x66d1, 0x7758, 0x03e7, 0x126e, 0x20f5, 0x317c,
- 0xd90a, 0xc883, 0xfa18, 0xeb91, 0x9f2e, 0x8ea7, 0xbc3c, 0xadb5,
- 0x5542, 0x44cb, 0x7650, 0x67d9, 0x1366, 0x02ef, 0x3074, 0x21fd,
- 0xe889, 0xf900, 0xcb9b, 0xda12, 0xaead, 0xbf24, 0x8dbf, 0x9c36,
- 0x64c1, 0x7548, 0x47d3, 0x565a, 0x22e5, 0x336c, 0x01f7, 0x107e,
- 0xf808, 0xe981, 0xdb1a, 0xca93, 0xbe2c, 0xafa5, 0x9d3e, 0x8cb7,
- 0x7440, 0x65c9, 0x5752, 0x46db, 0x3264, 0x23ed, 0x1176, 0x00ff
-};
+ if ((crc & 0xffff) != 0x7070)
+ return -1;
-/*---------------------------------------------------------------------------*/
+ return 0;
+}
-static unsigned short calc_crc_flex(unsigned char *cp, int size)
+static int check_crc_16(unsigned char *cp, int size)
{
- unsigned short crc = 0xffff;
-
- while (size--)
- crc = (crc << 8) ^ Crc_flex_table[((crc >> 8) ^ *cp++) & 0xff];
+ unsigned short crc = 0x0000;
+
+ if (size < 3)
+ return -1;
- return crc;
+ crc = crc16(0, cp, size);
+
+ if (crc != 0x0000)
+ return -1;
+
+ return 0;
}
-/*---------------------------------------------------------------------------*/
+/*
+ * Standard encapsulation
+ */
-static int check_crc_flex(unsigned char *cp, int size)
+static int kiss_esc(unsigned char *s, unsigned char *d, int len)
{
- unsigned short crc = 0xffff;
+ unsigned char *ptr = d;
+ unsigned char c;
- if (size < 3)
- return -1;
+ /*
+ * Send an initial END character to flush out any data that may have
+ * accumulated in the receiver due to line noise.
+ */
- while (size--)
- crc = (crc << 8) ^ Crc_flex_table[((crc >> 8) ^ *cp++) & 0xff];
+ *ptr++ = END;
- if ((crc & 0xffff) != 0x7070)
- return -1;
+ 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;
+ }
+ }
- return 0;
-}
+ *ptr++ = END;
-/*---------------------------------------------------------------------------*/
+ return ptr - d;
+}
-/* Find a free channel, and link in this `tty' line. */
-static inline struct ax_disp *ax_alloc(void)
+/*
+ * MW:
+ * OK its ugly, but tell me a better solution without copying the
+ * packet to a temporary buffer :-)
+ */
+static int kiss_esc_crc(unsigned char *s, unsigned char *d, unsigned short crc,
+ int len)
{
- ax25_ctrl_t *axp=NULL;
- int i;
+ unsigned char *ptr = d;
+ unsigned char c=0;
+
+ *ptr++ = END;
+ while (len > 0) {
+ if (len > 2)
+ c = *s++;
+ else if (len > 1)
+ c = crc >> 8;
+ else if (len > 0)
+ c = crc & 0xff;
- for (i = 0; i < ax25_maxdev; i++) {
- axp = ax25_ctrls[i];
+ len--;
- /* Not allocated ? */
- if (axp == NULL)
+ switch (c) {
+ case END:
+ *ptr++ = ESC;
+ *ptr++ = ESC_END;
break;
-
- /* Not in use ? */
- if (!test_and_set_bit(AXF_INUSE, &axp->ctrl.flags))
+ case ESC:
+ *ptr++ = ESC;
+ *ptr++ = ESC_ESC;
+ break;
+ default:
+ *ptr++ = c;
break;
+ }
}
+ *ptr++ = END;
- /* Sorry, too many, all slots in use */
- if (i >= ax25_maxdev)
- return NULL;
+ return ptr - d;
+}
- /* If no channels are available, allocate one */
- if (axp == NULL && (ax25_ctrls[i] = kmalloc(sizeof(ax25_ctrl_t), GFP_KERNEL)) != NULL) {
- axp = ax25_ctrls[i];
- }
- memset(axp, 0, sizeof(ax25_ctrl_t));
-
- /* Initialize channel control data */
- set_bit(AXF_INUSE, &axp->ctrl.flags);
- sprintf(axp->dev.name, "ax%d", i++);
- axp->ctrl.tty = NULL;
- axp->dev.base_addr = i;
- axp->dev.priv = (void *)&axp->ctrl;
- axp->dev.next = NULL;
- axp->dev.init = ax25_init;
-
- if (axp != NULL) {
- /*
- * register device so that it can be ifconfig'ed
- * ax25_init() will be called as a side-effect
- * SIDE-EFFECT WARNING: ax25_init() CLEARS axp->ctrl !
- */
- if (register_netdev(&axp->dev) == 0) {
- /* (Re-)Set the INUSE bit. Very Important! */
- set_bit(AXF_INUSE, &axp->ctrl.flags);
- axp->ctrl.dev = &axp->dev;
- axp->dev.priv = (void *) &axp->ctrl;
-
- return &axp->ctrl;
- } else {
- clear_bit(AXF_INUSE,&axp->ctrl.flags);
- printk(KERN_ERR "mkiss: ax_alloc() - register_netdev() failure.\n");
+/* Send one completely decapsulated AX.25 packet to the AX.25 layer. */
+static void ax_bump(struct mkiss *ax)
+{
+ struct sk_buff *skb;
+ int count;
+
+ spin_lock_bh(&ax->buflock);
+ if (ax->rbuff[0] > 0x0f) {
+ if (ax->rbuff[0] & 0x80) {
+ if (check_crc_16(ax->rbuff, ax->rcount) < 0) {
+ ax->stats.rx_errors++;
+ spin_unlock_bh(&ax->buflock);
+
+ return;
+ }
+ if (ax->crcmode != CRC_MODE_SMACK && ax->crcauto) {
+ printk(KERN_INFO
+ "mkiss: %s: Switchting to crc-smack\n",
+ ax->dev->name);
+ ax->crcmode = CRC_MODE_SMACK;
+ }
+ ax->rcount -= 2;
+ *ax->rbuff &= ~0x80;
+ } else if (ax->rbuff[0] & 0x20) {
+ if (check_crc_flex(ax->rbuff, ax->rcount) < 0) {
+ ax->stats.rx_errors++;
+ spin_unlock_bh(&ax->buflock);
+ return;
+ }
+ if (ax->crcmode != CRC_MODE_FLEX && ax->crcauto) {
+ printk(KERN_INFO
+ "mkiss: %s: Switchting to crc-flexnet\n",
+ ax->dev->name);
+ ax->crcmode = CRC_MODE_FLEX;
+ }
+ ax->rcount -= 2;
+
+ /*
+ * dl9sau bugfix: the trailling two bytes flexnet crc
+ * will not be passed to the kernel. thus we have to
+ * correct the kissparm signature, because it indicates
+ * a crc but there's none
+ */
+ *ax->rbuff &= ~0x20;
}
+ }
+ spin_unlock_bh(&ax->buflock);
+
+ count = ax->rcount;
+
+ if ((skb = dev_alloc_skb(count)) == NULL) {
+ printk(KERN_ERR "mkiss: %s: memory squeeze, dropping packet.\n",
+ ax->dev->name);
+ ax->stats.rx_dropped++;
+ return;
}
- return NULL;
+ spin_lock_bh(&ax->buflock);
+ memcpy(skb_put(skb,count), ax->rbuff, count);
+ spin_unlock_bh(&ax->buflock);
+ skb->protocol = ax25_type_trans(skb, ax->dev);
+ netif_rx(skb);
+ ax->dev->last_rx = jiffies;
+ ax->stats.rx_packets++;
+ ax->stats.rx_bytes += count;
}
-/* Free an AX25 channel. */
-static inline void ax_free(struct ax_disp *ax)
+static void kiss_unesc(struct mkiss *ax, unsigned char s)
{
- /* Free all AX25 frame buffers. */
- if (ax->rbuff)
- kfree(ax->rbuff);
- ax->rbuff = NULL;
- if (ax->xbuff)
- kfree(ax->xbuff);
- ax->xbuff = NULL;
- if (!test_and_clear_bit(AXF_INUSE, &ax->flags))
- printk(KERN_ERR "mkiss: %s: ax_free for already free unit.\n", ax->dev->name);
+ switch (s) {
+ case END:
+ /* drop keeptest bit = VSV */
+ if (test_bit(AXF_KEEPTEST, &ax->flags))
+ clear_bit(AXF_KEEPTEST, &ax->flags);
+
+ if (!test_and_clear_bit(AXF_ERROR, &ax->flags) && (ax->rcount > 2))
+ ax_bump(ax);
+
+ clear_bit(AXF_ESCAPE, &ax->flags);
+ ax->rcount = 0;
+ return;
+
+ case ESC:
+ set_bit(AXF_ESCAPE, &ax->flags);
+ return;
+ case ESC_ESC:
+ if (test_and_clear_bit(AXF_ESCAPE, &ax->flags))
+ s = ESC;
+ break;
+ case ESC_END:
+ if (test_and_clear_bit(AXF_ESCAPE, &ax->flags))
+ s = END;
+ break;
+ }
+
+ spin_lock_bh(&ax->buflock);
+ if (!test_bit(AXF_ERROR, &ax->flags)) {
+ if (ax->rcount < ax->buffsize) {
+ ax->rbuff[ax->rcount++] = s;
+ spin_unlock_bh(&ax->buflock);
+ return;
+ }
+
+ ax->stats.rx_over_errors++;
+ set_bit(AXF_ERROR, &ax->flags);
+ }
+ spin_unlock_bh(&ax->buflock);
}
-static void ax_changedmtu(struct ax_disp *ax)
+static int ax_set_mac_address(struct net_device *dev, void *addr)
+{
+ struct sockaddr_ax25 *sa = addr;
+
+ spin_lock_irq(&dev->xmit_lock);
+ memcpy(dev->dev_addr, &sa->sax25_call, AX25_ADDR_LEN);
+ spin_unlock_irq(&dev->xmit_lock);
+
+ return 0;
+}
+
+/*---------------------------------------------------------------------------*/
+
+static void ax_changedmtu(struct mkiss *ax)
{
struct net_device *dev = ax->dev;
unsigned char *xbuff, *rbuff, *oxbuff, *orbuff;
rbuff = kmalloc(len + 4, GFP_ATOMIC);
if (xbuff == NULL || rbuff == NULL) {
- printk(KERN_ERR "mkiss: %s: unable to grow ax25 buffers, MTU change cancelled.\n",
+ printk(KERN_ERR "mkiss: %s: unable to grow ax25 buffers, "
+ "MTU change cancelled.\n",
ax->dev->name);
dev->mtu = ax->mtu;
- if (xbuff != NULL)
- kfree(xbuff);
- if (rbuff != NULL)
- kfree(rbuff);
+ kfree(xbuff);
+ kfree(rbuff);
return;
}
memcpy(ax->xbuff, ax->xhead, ax->xleft);
} else {
ax->xleft = 0;
- ax->tx_dropped++;
+ ax->stats.tx_dropped++;
}
}
memcpy(ax->rbuff, orbuff, ax->rcount);
} else {
ax->rcount = 0;
- ax->rx_over_errors++;
+ ax->stats.rx_over_errors++;
set_bit(AXF_ERROR, &ax->flags);
}
}
spin_unlock_bh(&ax->buflock);
- if (oxbuff != NULL)
- kfree(oxbuff);
- if (orbuff != NULL)
- kfree(orbuff);
-}
-
-
-/* Set the "sending" flag. This must be atomic. */
-static inline void ax_lock(struct ax_disp *ax)
-{
- netif_stop_queue(ax->dev);
-}
-
-
-/* Clear the "sending" flag. This must be atomic. */
-static inline void ax_unlock(struct ax_disp *ax)
-{
- netif_start_queue(ax->dev);
-}
-
-/* Send one completely decapsulated AX.25 packet to the AX.25 layer. */
-static void ax_bump(struct ax_disp *ax)
-{
- struct sk_buff *skb;
- int count;
-
- spin_lock_bh(&ax->buflock);
- if (ax->rbuff[0] > 0x0f) {
- if (ax->rbuff[0] & 0x20) {
- ax->crcmode = CRC_MODE_FLEX;
- if (check_crc_flex(ax->rbuff, ax->rcount) < 0) {
- ax->rx_errors++;
- return;
- }
- ax->rcount -= 2;
- /* dl9sau bugfix: the trailling two bytes flexnet crc
- * will not be passed to the kernel. thus we have
- * to correct the kissparm signature, because it
- * indicates a crc but there's none
- */
- *ax->rbuff &= ~0x20;
- }
- }
- spin_unlock_bh(&ax->buflock);
-
- count = ax->rcount;
-
- if ((skb = dev_alloc_skb(count)) == NULL) {
- printk(KERN_ERR "mkiss: %s: memory squeeze, dropping packet.\n", ax->dev->name);
- ax->rx_dropped++;
- return;
- }
-
- spin_lock_bh(&ax->buflock);
- memcpy(skb_put(skb,count), ax->rbuff, count);
- spin_unlock_bh(&ax->buflock);
- skb->protocol = ax25_type_trans(skb, ax->dev);
- netif_rx(skb);
- ax->dev->last_rx = jiffies;
- ax->rx_packets++;
- ax->rx_bytes+=count;
+ kfree(oxbuff);
+ kfree(orbuff);
}
/* Encapsulate one AX.25 packet and stuff into a TTY queue. */
-static void ax_encaps(struct ax_disp *ax, unsigned char *icp, int len)
+static void ax_encaps(struct net_device *dev, unsigned char *icp, int len)
{
+ struct mkiss *ax = netdev_priv(dev);
unsigned char *p;
int actual, count;
if (len > ax->mtu) { /* Sigh, shouldn't occur BUT ... */
len = ax->mtu;
printk(KERN_ERR "mkiss: %s: truncating oversized transmit packet!\n", ax->dev->name);
- ax->tx_dropped++;
- ax_unlock(ax);
+ ax->stats.tx_dropped++;
+ netif_start_queue(dev);
return;
}
p = icp;
spin_lock_bh(&ax->buflock);
- switch (ax->crcmode) {
- unsigned short crc;
+ if ((*p & 0x0f) != 0) {
+ /* Configuration Command (kissparms(1).
+ * Protocol spec says: never append CRC.
+ * This fixes a very old bug in the linux
+ * kiss driver. -- dl9sau */
+ switch (*p & 0xff) {
+ case 0x85:
+ /* command from userspace especially for us,
+ * not for delivery to the tnc */
+ if (len > 1) {
+ int cmd = (p[1] & 0xff);
+ switch(cmd) {
+ case 3:
+ ax->crcmode = CRC_MODE_SMACK;
+ break;
+ case 2:
+ ax->crcmode = CRC_MODE_FLEX;
+ break;
+ case 1:
+ ax->crcmode = CRC_MODE_NONE;
+ break;
+ case 0:
+ default:
+ ax->crcmode = CRC_MODE_SMACK_TEST;
+ cmd = 0;
+ }
+ ax->crcauto = (cmd ? 0 : 1);
+ printk(KERN_INFO "mkiss: %s: crc mode %s %d\n", ax->dev->name, (len) ? "set to" : "is", cmd);
+ }
+ spin_unlock_bh(&ax->buflock);
+ netif_start_queue(dev);
- case CRC_MODE_FLEX:
- *p |= 0x20;
- crc = calc_crc_flex(p, len);
- count = kiss_esc_crc(p, (unsigned char *)ax->xbuff, crc, len+2);
- break;
+ return;
+ default:
+ count = kiss_esc(p, (unsigned char *)ax->xbuff, len);
+ }
+ } else {
+ unsigned short crc;
+ switch (ax->crcmode) {
+ case CRC_MODE_SMACK_TEST:
+ ax->crcmode = CRC_MODE_FLEX_TEST;
+ printk(KERN_INFO "mkiss: %s: Trying crc-smack\n", ax->dev->name);
+ // fall through
+ case CRC_MODE_SMACK:
+ *p |= 0x80;
+ crc = swab16(crc16(0, p, len));
+ count = kiss_esc_crc(p, (unsigned char *)ax->xbuff, crc, len+2);
+ break;
+ case CRC_MODE_FLEX_TEST:
+ ax->crcmode = CRC_MODE_NONE;
+ printk(KERN_INFO "mkiss: %s: Trying crc-flexnet\n", ax->dev->name);
+ // fall through
+ case CRC_MODE_FLEX:
+ *p |= 0x20;
+ crc = calc_crc_flex(p, len);
+ count = kiss_esc_crc(p, (unsigned char *)ax->xbuff, crc, len+2);
+ break;
- default:
- count = kiss_esc(p, (unsigned char *)ax->xbuff, len);
- break;
- }
-
- ax->tty->flags |= (1 << TTY_DO_WRITE_WAKEUP);
+ default:
+ count = kiss_esc(p, (unsigned char *)ax->xbuff, len);
+ }
+ }
+ spin_unlock_bh(&ax->buflock);
+
+ set_bit(TTY_DO_WRITE_WAKEUP, &ax->tty->flags);
actual = ax->tty->driver->write(ax->tty, ax->xbuff, count);
- ax->tx_packets++;
- ax->tx_bytes+=actual;
+ ax->stats.tx_packets++;
+ ax->stats.tx_bytes += actual;
+
ax->dev->trans_start = jiffies;
ax->xleft = count - actual;
ax->xhead = ax->xbuff + actual;
-
- spin_unlock_bh(&ax->buflock);
-}
-
-/*
- * Called by the driver when there's room for more data. If we have
- * more packets to send, we send them here.
- */
-static void ax25_write_wakeup(struct tty_struct *tty)
-{
- int actual;
- struct ax_disp *ax = (struct ax_disp *) tty->disc_data;
-
- /* First make sure we're connected. */
- if (ax == NULL || ax->magic != AX25_MAGIC || !netif_running(ax->dev))
- return;
- if (ax->xleft <= 0) {
- /* Now serial buffer is almost free & we can start
- * transmission of another packet
- */
- tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
-
- netif_wake_queue(ax->dev);
- return;
- }
-
- actual = tty->driver->write(tty, ax->xhead, ax->xleft);
- ax->xleft -= actual;
- ax->xhead += actual;
}
/* Encapsulate an AX.25 packet and kick it into a TTY queue. */
static int ax_xmit(struct sk_buff *skb, struct net_device *dev)
{
- struct ax_disp *ax = netdev_priv(dev);
+ struct mkiss *ax = netdev_priv(dev);
if (!netif_running(dev)) {
printk(KERN_ERR "mkiss: %s: xmit call when iface is down\n", dev->name);
* May be we must check transmitter timeout here ?
* 14 Oct 1994 Dmitry Gorodchanin.
*/
- if (jiffies - dev->trans_start < 20 * HZ) {
+ if (time_before(jiffies, dev->trans_start + 20 * HZ)) {
/* 20 sec timeout not reached */
return 1;
}
"bad line quality" : "driver error");
ax->xleft = 0;
- ax->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
- ax_unlock(ax);
+ clear_bit(TTY_DO_WRITE_WAKEUP, &ax->tty->flags);
+ netif_start_queue(dev);
}
/* We were not busy, so we are now... :-) */
if (skb != NULL) {
- ax_lock(ax);
- ax_encaps(ax, skb->data, skb->len);
+ netif_stop_queue(dev);
+ ax_encaps(dev, skb->data, skb->len);
kfree_skb(skb);
}
return 0;
}
+static int ax_open_dev(struct net_device *dev)
+{
+ struct mkiss *ax = netdev_priv(dev);
+
+ if (ax->tty == NULL)
+ return -ENODEV;
+
+ return 0;
+}
+
#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
/* Return the frame type ID */
{
#ifdef CONFIG_INET
if (type != htons(ETH_P_AX25))
- return ax25_encapsulate(skb, dev, type, daddr, saddr, len);
+ return ax25_hard_header(skb, dev, type, daddr, saddr, len);
#endif
return 0;
}
/* Open the low-level part of the AX25 channel. Easy! */
static int ax_open(struct net_device *dev)
{
- struct ax_disp *ax = netdev_priv(dev);
+ struct mkiss *ax = netdev_priv(dev);
unsigned long len;
if (ax->tty == NULL)
spin_lock_init(&ax->buflock);
- netif_start_queue(dev);
return 0;
noxbuff:
/* Close the low-level part of the AX25 channel. Easy! */
static int ax_close(struct net_device *dev)
{
- struct ax_disp *ax = netdev_priv(dev);
-
- if (ax->tty == NULL)
- return -EBUSY;
+ struct mkiss *ax = netdev_priv(dev);
- ax->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
+ if (ax->tty)
+ clear_bit(TTY_DO_WRITE_WAKEUP, &ax->tty->flags);
netif_stop_queue(dev);
return 0;
}
-static int ax25_receive_room(struct tty_struct *tty)
+static struct net_device_stats *ax_get_stats(struct net_device *dev)
+{
+ struct mkiss *ax = netdev_priv(dev);
+
+ return &ax->stats;
+}
+
+static void ax_setup(struct net_device *dev)
{
- return 65536; /* We can handle an infinite amount of data. :-) */
+ static char ax25_bcast[AX25_ADDR_LEN] =
+ {'Q'<<1,'S'<<1,'T'<<1,' '<<1,' '<<1,' '<<1,'0'<<1};
+ static char ax25_test[AX25_ADDR_LEN] =
+ {'L'<<1,'I'<<1,'N'<<1,'U'<<1,'X'<<1,' '<<1,'1'<<1};
+
+ /* Finish setting up the DEVICE info. */
+ dev->mtu = AX_MTU;
+ dev->hard_start_xmit = ax_xmit;
+ dev->open = ax_open_dev;
+ dev->stop = ax_close;
+ dev->get_stats = ax_get_stats;
+ dev->set_mac_address = ax_set_mac_address;
+ dev->hard_header_len = 0;
+ dev->addr_len = 0;
+ dev->type = ARPHRD_AX25;
+ dev->tx_queue_len = 10;
+ dev->hard_header = ax_header;
+ dev->rebuild_header = ax_rebuild_header;
+
+ memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN);
+ memcpy(dev->dev_addr, ax25_test, AX25_ADDR_LEN);
+
+ dev->flags = IFF_BROADCAST | IFF_MULTICAST;
}
/*
- * Handle the 'receiver data ready' interrupt.
- * This function is called by the 'tty_io' module in the kernel when
- * a block of data has been received, which can now be decapsulated
- * and sent on to the AX.25 layer for further processing.
+ * We have a potential race on dereferencing tty->disc_data, because the tty
+ * layer provides no locking at all - thus one cpu could be running
+ * sixpack_receive_buf while another calls sixpack_close, which zeroes
+ * tty->disc_data and frees the memory that sixpack_receive_buf is using. The
+ * best way to fix this is to use a rwlock in the tty struct, but for now we
+ * use a single global rwlock for all ttys in ppp line discipline.
*/
-static void ax25_receive_buf(struct tty_struct *tty, const unsigned char *cp, char *fp, int count)
-{
- struct ax_disp *ax = (struct ax_disp *) tty->disc_data;
+static DEFINE_RWLOCK(disc_data_lock);
- if (ax == NULL || ax->magic != AX25_MAGIC || !netif_running(ax->dev))
- return;
+static struct mkiss *mkiss_get(struct tty_struct *tty)
+{
+ struct mkiss *ax;
- /*
- * Argh! mtu change time! - costs us the packet part received
- * at the change
- */
- if (ax->mtu != ax->dev->mtu + 73)
- ax_changedmtu(ax);
+ read_lock(&disc_data_lock);
+ ax = tty->disc_data;
+ if (ax)
+ atomic_inc(&ax->refcnt);
+ read_unlock(&disc_data_lock);
- /* Read the characters out of the buffer */
- while (count--) {
- if (fp != NULL && *fp++) {
- if (!test_and_set_bit(AXF_ERROR, &ax->flags))
- ax->rx_errors++;
- cp++;
- continue;
- }
+ return ax;
+}
- kiss_unesc(ax, *cp++);
- }
+static void mkiss_put(struct mkiss *ax)
+{
+ if (atomic_dec_and_test(&ax->refcnt))
+ up(&ax->dead_sem);
}
-static int ax25_open(struct tty_struct *tty)
+static int crc_force = 0; /* Can be overridden with insmod */
+
+static int mkiss_open(struct tty_struct *tty)
{
- struct ax_disp *ax = (struct ax_disp *) tty->disc_data;
+ struct net_device *dev;
+ struct mkiss *ax;
int err;
- /* First make sure we're not already connected. */
- if (ax && ax->magic == AX25_MAGIC)
- return -EEXIST;
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ dev = alloc_netdev(sizeof(struct mkiss), "ax%d", ax_setup);
+ if (!dev) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ ax = netdev_priv(dev);
+ ax->dev = dev;
- /* OK. Find a free AX25 channel to use. */
- if ((ax = ax_alloc()) == NULL)
- return -ENFILE;
+ spin_lock_init(&ax->buflock);
+ atomic_set(&ax->refcnt, 1);
+ init_MUTEX_LOCKED(&ax->dead_sem);
ax->tty = tty;
tty->disc_data = ax;
+ tty->receive_room = 65535;
if (tty->driver->flush_buffer)
tty->driver->flush_buffer(tty);
/* Restore default settings */
- ax->dev->type = ARPHRD_AX25;
+ dev->type = ARPHRD_AX25;
/* Perform the low-level AX25 initialization. */
- if ((err = ax_open(ax->dev)))
- return err;
-
- /* Done. We have linked the TTY line to a channel. */
- return ax->dev->base_addr;
-}
+ if ((err = ax_open(ax->dev))) {
+ goto out_free_netdev;
+ }
-static void ax25_close(struct tty_struct *tty)
-{
- struct ax_disp *ax = (struct ax_disp *) tty->disc_data;
+ if (register_netdev(dev))
+ goto out_free_buffers;
- /* First make sure we're connected. */
- if (ax == NULL || ax->magic != AX25_MAGIC)
- return;
+ /* after register_netdev() - because else printk smashes the kernel */
+ switch (crc_force) {
+ case 3:
+ ax->crcmode = CRC_MODE_SMACK;
+ printk(KERN_INFO "mkiss: %s: crc mode smack forced.\n",
+ ax->dev->name);
+ break;
+ case 2:
+ ax->crcmode = CRC_MODE_FLEX;
+ printk(KERN_INFO "mkiss: %s: crc mode flexnet forced.\n",
+ ax->dev->name);
+ break;
+ case 1:
+ ax->crcmode = CRC_MODE_NONE;
+ printk(KERN_INFO "mkiss: %s: crc mode disabled.\n",
+ ax->dev->name);
+ break;
+ case 0:
+ /* fall through */
+ default:
+ crc_force = 0;
+ printk(KERN_INFO "mkiss: %s: crc mode is auto.\n",
+ ax->dev->name);
+ ax->crcmode = CRC_MODE_SMACK_TEST;
+ }
+ ax->crcauto = (crc_force ? 0 : 1);
- unregister_netdev(ax->dev);
+ netif_start_queue(dev);
- tty->disc_data = NULL;
- ax->tty = NULL;
+ /* Done. We have linked the TTY line to a channel. */
+ return 0;
- ax_free(ax);
-}
+out_free_buffers:
+ kfree(ax->rbuff);
+ kfree(ax->xbuff);
+out_free_netdev:
+ free_netdev(dev);
-static struct net_device_stats *ax_get_stats(struct net_device *dev)
-{
- static struct net_device_stats stats;
- struct ax_disp *ax = netdev_priv(dev);
-
- memset(&stats, 0, sizeof(struct net_device_stats));
-
- stats.rx_packets = ax->rx_packets;
- stats.tx_packets = ax->tx_packets;
- stats.rx_bytes = ax->rx_bytes;
- stats.tx_bytes = ax->tx_bytes;
- stats.rx_dropped = ax->rx_dropped;
- stats.tx_dropped = ax->tx_dropped;
- stats.tx_errors = ax->tx_errors;
- stats.rx_errors = ax->rx_errors;
- stats.rx_over_errors = ax->rx_over_errors;
-
- return &stats;
+out:
+ return err;
}
+static void mkiss_close(struct tty_struct *tty)
+{
+ struct mkiss *ax;
-/************************************************************************
- * STANDARD ENCAPSULATION *
- ************************************************************************/
+ write_lock(&disc_data_lock);
+ ax = tty->disc_data;
+ tty->disc_data = NULL;
+ write_unlock(&disc_data_lock);
-static int kiss_esc(unsigned char *s, unsigned char *d, int len)
-{
- unsigned char *ptr = d;
- unsigned char c;
+ if (ax == 0)
+ return;
/*
- * Send an initial END character to flush out any
- * data that may have accumulated in the receiver
- * due to line noise.
+ * We have now ensured that nobody can start using ap from now on, but
+ * we have to wait for all existing users to finish.
*/
+ if (!atomic_dec_and_test(&ax->refcnt))
+ down(&ax->dead_sem);
- *ptr++ = END;
-
- 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;
- }
- }
+ unregister_netdev(ax->dev);
- *ptr++ = END;
+ /* Free all AX25 frame buffers. */
+ kfree(ax->rbuff);
+ kfree(ax->xbuff);
- return ptr - d;
+ ax->tty = NULL;
}
-/*
- * MW:
- * OK its ugly, but tell me a better solution without copying the
- * packet to a temporary buffer :-)
- */
-static int kiss_esc_crc(unsigned char *s, unsigned char *d, unsigned short crc, int len)
+/* Perform I/O control on an active ax25 channel. */
+static int mkiss_ioctl(struct tty_struct *tty, struct file *file,
+ unsigned int cmd, unsigned long arg)
{
- unsigned char *ptr = d;
- unsigned char c=0;
-
- *ptr++ = END;
- while (len > 0) {
- if (len > 2)
- c = *s++;
- else if (len > 1)
- c = crc >> 8;
- else if (len > 0)
- c = crc & 0xff;
+ struct mkiss *ax = mkiss_get(tty);
+ struct net_device *dev = ax->dev;
+ unsigned int tmp, err;
- len--;
+ /* First make sure we're connected. */
+ if (ax == NULL)
+ return -ENXIO;
- switch (c) {
- case END:
- *ptr++ = ESC;
- *ptr++ = ESC_END;
- break;
- case ESC:
- *ptr++ = ESC;
- *ptr++ = ESC_ESC;
- break;
- default:
- *ptr++ = c;
- break;
+ switch (cmd) {
+ case SIOCGIFNAME:
+ err = copy_to_user((void __user *) arg, ax->dev->name,
+ strlen(ax->dev->name) + 1) ? -EFAULT : 0;
+ break;
+
+ case SIOCGIFENCAP:
+ err = put_user(4, (int __user *) arg);
+ break;
+
+ case SIOCSIFENCAP:
+ if (get_user(tmp, (int __user *) arg)) {
+ err = -EFAULT;
+ break;
}
- }
- *ptr++ = END;
- return ptr - d;
-}
-static void kiss_unesc(struct ax_disp *ax, unsigned char s)
-{
- switch (s) {
- case END:
- /* drop keeptest bit = VSV */
- if (test_bit(AXF_KEEPTEST, &ax->flags))
- clear_bit(AXF_KEEPTEST, &ax->flags);
+ ax->mode = tmp;
+ dev->addr_len = AX25_ADDR_LEN;
+ dev->hard_header_len = AX25_KISS_HEADER_LEN +
+ AX25_MAX_HEADER_LEN + 3;
+ dev->type = ARPHRD_AX25;
- if (!test_and_clear_bit(AXF_ERROR, &ax->flags) && (ax->rcount > 2))
- ax_bump(ax);
+ err = 0;
+ break;
- clear_bit(AXF_ESCAPE, &ax->flags);
- ax->rcount = 0;
- return;
+ case SIOCSIFHWADDR: {
+ char addr[AX25_ADDR_LEN];
- case ESC:
- set_bit(AXF_ESCAPE, &ax->flags);
- return;
- case ESC_ESC:
- if (test_and_clear_bit(AXF_ESCAPE, &ax->flags))
- s = ESC;
+ if (copy_from_user(&addr,
+ (void __user *) arg, AX25_ADDR_LEN)) {
+ err = -EFAULT;
break;
- case ESC_END:
- if (test_and_clear_bit(AXF_ESCAPE, &ax->flags))
- s = END;
- break;
- }
-
- spin_lock_bh(&ax->buflock);
- if (!test_bit(AXF_ERROR, &ax->flags)) {
- if (ax->rcount < ax->buffsize) {
- ax->rbuff[ax->rcount++] = s;
- spin_unlock_bh(&ax->buflock);
- return;
}
- ax->rx_over_errors++;
- set_bit(AXF_ERROR, &ax->flags);
+ spin_lock_irq(&dev->xmit_lock);
+ memcpy(dev->dev_addr, addr, AX25_ADDR_LEN);
+ spin_unlock_irq(&dev->xmit_lock);
+
+ err = 0;
+ break;
+ }
+ default:
+ err = -ENOIOCTLCMD;
}
- spin_unlock_bh(&ax->buflock);
-}
+ mkiss_put(ax);
-static int ax_set_mac_address(struct net_device *dev, void __user *addr)
-{
- if (copy_from_user(dev->dev_addr, addr, AX25_ADDR_LEN))
- return -EFAULT;
- return 0;
+ return err;
}
-static int ax_set_dev_mac_address(struct net_device *dev, void *addr)
+/*
+ * Handle the 'receiver data ready' interrupt.
+ * This function is called by the 'tty_io' module in the kernel when
+ * a block of data has been received, which can now be decapsulated
+ * and sent on to the AX.25 layer for further processing.
+ */
+static void mkiss_receive_buf(struct tty_struct *tty, const unsigned char *cp,
+ char *fp, int count)
{
- struct sockaddr *sa = addr;
-
- memcpy(dev->dev_addr, sa->sa_data, AX25_ADDR_LEN);
-
- return 0;
-}
+ struct mkiss *ax = mkiss_get(tty);
+ if (!ax)
+ return;
-/* Perform I/O control on an active ax25 channel. */
-static int ax25_disp_ioctl(struct tty_struct *tty, void *file, int cmd, void __user *arg)
-{
- struct ax_disp *ax = (struct ax_disp *) tty->disc_data;
- unsigned int tmp;
-
- /* First make sure we're connected. */
- if (ax == NULL || ax->magic != AX25_MAGIC)
- return -EINVAL;
+ /*
+ * Argh! mtu change time! - costs us the packet part received
+ * at the change
+ */
+ if (ax->mtu != ax->dev->mtu + 73)
+ ax_changedmtu(ax);
- switch (cmd) {
- case SIOCGIFNAME:
- if (copy_to_user(arg, ax->dev->name, strlen(ax->dev->name) + 1))
- return -EFAULT;
- return 0;
-
- case SIOCGIFENCAP:
- return put_user(4, (int __user *)arg);
-
- case SIOCSIFENCAP:
- if (get_user(tmp, (int __user *)arg))
- return -EFAULT;
- ax->mode = tmp;
- ax->dev->addr_len = AX25_ADDR_LEN; /* sizeof an AX.25 addr */
- ax->dev->hard_header_len = AX25_KISS_HEADER_LEN + AX25_MAX_HEADER_LEN + 3;
- ax->dev->type = ARPHRD_AX25;
- return 0;
-
- case SIOCSIFHWADDR:
- return ax_set_mac_address(ax->dev, arg);
+ /* Read the characters out of the buffer */
+ while (count--) {
+ if (fp != NULL && *fp++) {
+ if (!test_and_set_bit(AXF_ERROR, &ax->flags))
+ ax->stats.rx_errors++;
+ cp++;
+ continue;
+ }
- default:
- return -ENOIOCTLCMD;
+ kiss_unesc(ax, *cp++);
}
-}
-static int ax_open_dev(struct net_device *dev)
-{
- struct ax_disp *ax = netdev_priv(dev);
-
- if (ax->tty == NULL)
- return -ENODEV;
-
- return 0;
+ mkiss_put(ax);
+ if (test_and_clear_bit(TTY_THROTTLED, &tty->flags)
+ && tty->driver->unthrottle)
+ tty->driver->unthrottle(tty);
}
-
-/* Initialize the driver. Called by network startup. */
-static int ax25_init(struct net_device *dev)
+/*
+ * Called by the driver when there's room for more data. If we have
+ * more packets to send, we send them here.
+ */
+static void mkiss_write_wakeup(struct tty_struct *tty)
{
- struct ax_disp *ax = netdev_priv(dev);
-
- static char ax25_bcast[AX25_ADDR_LEN] =
- {'Q'<<1,'S'<<1,'T'<<1,' '<<1,' '<<1,' '<<1,'0'<<1};
- static char ax25_test[AX25_ADDR_LEN] =
- {'L'<<1,'I'<<1,'N'<<1,'U'<<1,'X'<<1,' '<<1,'1'<<1};
-
- if (ax == NULL) /* Allocation failed ?? */
- return -ENODEV;
+ struct mkiss *ax = mkiss_get(tty);
+ int actual;
- /* Set up the "AX25 Control Block". (And clear statistics) */
- memset(ax, 0, sizeof (struct ax_disp));
- ax->magic = AX25_MAGIC;
- ax->dev = dev;
+ if (!ax)
+ return;
- /* Finish setting up the DEVICE info. */
- dev->mtu = AX_MTU;
- dev->hard_start_xmit = ax_xmit;
- dev->open = ax_open_dev;
- dev->stop = ax_close;
- dev->get_stats = ax_get_stats;
- dev->set_mac_address = ax_set_dev_mac_address;
- dev->hard_header_len = 0;
- dev->addr_len = 0;
- dev->type = ARPHRD_AX25;
- dev->tx_queue_len = 10;
- dev->hard_header = ax_header;
- dev->rebuild_header = ax_rebuild_header;
+ if (ax->xleft <= 0) {
+ /* Now serial buffer is almost free & we can start
+ * transmission of another packet
+ */
+ clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
- memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN);
- memcpy(dev->dev_addr, ax25_test, AX25_ADDR_LEN);
+ netif_wake_queue(ax->dev);
+ goto out;
+ }
- /* New-style flags. */
- dev->flags = IFF_BROADCAST | IFF_MULTICAST;
+ actual = tty->driver->write(tty, ax->xhead, ax->xleft);
+ ax->xleft -= actual;
+ ax->xhead += actual;
- return 0;
+out:
+ mkiss_put(ax);
}
+static struct tty_ldisc ax_ldisc = {
+ .owner = THIS_MODULE,
+ .magic = TTY_LDISC_MAGIC,
+ .name = "mkiss",
+ .open = mkiss_open,
+ .close = mkiss_close,
+ .ioctl = mkiss_ioctl,
+ .receive_buf = mkiss_receive_buf,
+ .write_wakeup = mkiss_write_wakeup
+};
-/* ******************************************************************** */
-/* * Init MKISS driver * */
-/* ******************************************************************** */
+static char banner[] __initdata = KERN_INFO \
+ "mkiss: AX.25 Multikiss, Hans Albas PE1AYX\n";
+static char msg_regfail[] __initdata = KERN_ERR \
+ "mkiss: can't register line discipline (err = %d)\n";
static int __init mkiss_init_driver(void)
{
printk(banner);
- if (ax25_maxdev < 4)
- ax25_maxdev = 4; /* Sanity */
+ if ((status = tty_register_ldisc(N_AX25, &ax_ldisc)) != 0)
+ printk(msg_regfail);
- if ((ax25_ctrls = kmalloc(sizeof(void *) * ax25_maxdev, GFP_KERNEL)) == NULL) {
- printk(KERN_ERR "mkiss: Can't allocate ax25_ctrls[] array!\n");
- return -ENOMEM;
- }
-
- /* Clear the pointer array, we allocate devices when we need them */
- memset(ax25_ctrls, 0, sizeof(void*) * ax25_maxdev); /* Pointers */
-
- /* Fill in our line protocol discipline, and register it */
- ax_ldisc.magic = TTY_LDISC_MAGIC;
- ax_ldisc.name = "mkiss";
- ax_ldisc.open = ax25_open;
- ax_ldisc.close = ax25_close;
- ax_ldisc.ioctl = (int (*)(struct tty_struct *, struct file *,
- unsigned int, unsigned long))ax25_disp_ioctl;
- ax_ldisc.receive_buf = ax25_receive_buf;
- ax_ldisc.receive_room = ax25_receive_room;
- ax_ldisc.write_wakeup = ax25_write_wakeup;
-
- if ((status = tty_register_ldisc(N_AX25, &ax_ldisc)) != 0) {
- printk(KERN_ERR "mkiss: can't register line discipline (err = %d)\n", status);
- kfree(ax25_ctrls);
- }
return status;
}
+static const char msg_unregfail[] __exitdata = KERN_ERR \
+ "mkiss: can't unregister line discipline (err = %d)\n";
+
static void __exit mkiss_exit_driver(void)
{
- int i;
+ int ret;
- for (i = 0; i < ax25_maxdev; i++) {
- if (ax25_ctrls[i]) {
- /*
- * VSV = if dev->start==0, then device
- * unregistered while close proc.
- */
- if (netif_running(&ax25_ctrls[i]->dev))
- unregister_netdev(&ax25_ctrls[i]->dev);
- kfree(ax25_ctrls[i]);
- }
- }
-
- kfree(ax25_ctrls);
- ax25_ctrls = NULL;
-
- if ((i = tty_register_ldisc(N_AX25, NULL)))
- printk(KERN_ERR "mkiss: can't unregister line discipline (err = %d)\n", i);
+ if ((ret = tty_unregister_ldisc(N_AX25)))
+ printk(msg_unregfail, ret);
}
-MODULE_AUTHOR("Hans Albas PE1AYX <hans@esrac.ele.tue.nl>");
+MODULE_AUTHOR("Ralf Baechle DL5RB <ralf@linux-mips.org>");
MODULE_DESCRIPTION("KISS driver for AX.25 over TTYs");
-MODULE_PARM(ax25_maxdev, "i");
-MODULE_PARM_DESC(ax25_maxdev, "number of MKISS devices");
+module_param(crc_force, int, 0);
+MODULE_PARM_DESC(crc_force, "crc [0 = auto | 1 = none | 2 = flexnet | 3 = smack]");
MODULE_LICENSE("GPL");
MODULE_ALIAS_LDISC(N_AX25);
+
module_init(mkiss_init_driver);
module_exit(mkiss_exit_driver);
-
git://git.onelab.eu / linux-2.6.git / blobdiff