diff options
Diffstat (limited to 'drivers/net/hamradio/mkiss.c')
| -rw-r--r-- | drivers/net/hamradio/mkiss.c | 1016 |
1 files changed, 0 insertions, 1016 deletions
diff --git a/drivers/net/hamradio/mkiss.c b/drivers/net/hamradio/mkiss.c deleted file mode 100644 index 3ec09be5a..000000000 --- a/drivers/net/hamradio/mkiss.c +++ /dev/null @@ -1,1016 +0,0 @@ -/* - * MKISS Driver - * - * 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 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. - * - * 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. - */ - -#include <linux/config.h> -#include <linux/module.h> -#include <asm/system.h> -#include <asm/segment.h> -#include <asm/bitops.h> -#include <asm/uaccess.h> -#include <linux/string.h> -#include <linux/mm.h> -#include <linux/interrupt.h> -#include <linux/in.h> -#include <linux/inet.h> -#include <linux/tty.h> -#include <linux/errno.h> -#include <linux/netdevice.h> -#include <linux/major.h> -#include <linux/init.h> -#include <linux/rtnetlink.h> -#include <linux/etherdevice.h> -#include <linux/skbuff.h> -#include <linux/if_arp.h> - -#include <net/ax25.h> - -#include "mkiss.h" - -#ifdef CONFIG_INET -#include <linux/ip.h> -#include <linux/tcp.h> -#endif - -static const char banner[] __initdata = KERN_INFO "mkiss: AX.25 Multikiss, Hans Albas PE1AYX\n"; - -#define NR_MKISS 4 -#define MKISS_SERIAL_TYPE_NORMAL 1 - -struct mkiss_channel { - int magic; /* magic word */ - int init; /* channel exists? */ - struct tty_struct *tty; /* link to tty control structure */ -}; - -typedef struct ax25_ctrl { - struct ax_disp ctrl; /* */ - struct net_device dev; /* the device */ -} ax25_ctrl_t; - -static ax25_ctrl_t **ax25_ctrls; - -int ax25_maxdev = AX25_MAXDEV; /* Can be overridden with insmod! */ - -static struct tty_ldisc ax_ldisc; - -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); - -/*---------------------------------------------------------------------------*/ - -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 -}; - -/*---------------------------------------------------------------------------*/ - -static unsigned short calc_crc_flex(unsigned char *cp, int size) -{ - unsigned short crc = 0xffff; - - while (size--) - crc = (crc << 8) ^ Crc_flex_table[((crc >> 8) ^ *cp++) & 0xff]; - - return crc; -} - -/*---------------------------------------------------------------------------*/ - -static int check_crc_flex(unsigned char *cp, int size) -{ - unsigned short crc = 0xffff; - - if (size < 3) - return -1; - - while (size--) - crc = (crc << 8) ^ Crc_flex_table[((crc >> 8) ^ *cp++) & 0xff]; - - if ((crc & 0xffff) != 0x7070) - return -1; - - return 0; -} - -/*---------------------------------------------------------------------------*/ - -/* Find a free channel, and link in this `tty' line. */ -static inline struct ax_disp *ax_alloc(void) -{ - ax25_ctrl_t *axp=NULL; - int i; - - for (i = 0; i < ax25_maxdev; i++) { - axp = ax25_ctrls[i]; - - /* Not allocated ? */ - if (axp == NULL) - break; - - /* Not in use ? */ - if (!test_and_set_bit(AXF_INUSE, &axp->ctrl.flags)) - break; - } - - /* Sorry, too many, all slots in use */ - if (i >= ax25_maxdev) - return NULL; - - /* 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"); - } - } - - return NULL; -} - -/* Free an AX25 channel. */ -static inline void ax_free(struct ax_disp *ax) -{ - /* 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); -} - -static void ax_changedmtu(struct ax_disp *ax) -{ - struct net_device *dev = ax->dev; - unsigned char *xbuff, *rbuff, *oxbuff, *orbuff; - int len; - unsigned long flags; - - len = dev->mtu * 2; - - /* - * allow for arrival of larger UDP packets, even if we say not to - * also fixes a bug in which SunOS sends 512-byte packets even with - * an MSS of 128 - */ - if (len < 576 * 2) - len = 576 * 2; - - xbuff = kmalloc(len + 4, GFP_ATOMIC); - 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", - ax->dev->name); - dev->mtu = ax->mtu; - if (xbuff != NULL) - kfree(xbuff); - if (rbuff != NULL) - kfree(rbuff); - return; - } - - save_flags(flags); - cli(); - - oxbuff = ax->xbuff; - ax->xbuff = xbuff; - orbuff = ax->rbuff; - ax->rbuff = rbuff; - - if (ax->xleft) { - if (ax->xleft <= len) { - memcpy(ax->xbuff, ax->xhead, ax->xleft); - } else { - ax->xleft = 0; - ax->tx_dropped++; - } - } - - ax->xhead = ax->xbuff; - - if (ax->rcount) { - if (ax->rcount <= len) { - memcpy(ax->rbuff, orbuff, ax->rcount); - } else { - ax->rcount = 0; - ax->rx_over_errors++; - set_bit(AXF_ERROR, &ax->flags); - } - } - - ax->mtu = dev->mtu + 73; - ax->buffsize = len; - - restore_flags(flags); - - 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 ax_disp *tmp_ax; - struct sk_buff *skb; - struct mkiss_channel *mkiss; - int count; - - tmp_ax = ax; - - if (ax->rbuff[0] > 0x0f) { - if (ax->mkiss != NULL) { - mkiss= ax->mkiss->tty->driver_data; - if (mkiss->magic == MKISS_DRIVER_MAGIC) - tmp_ax = ax->mkiss; - } else 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; - } - } - - 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; - } - - skb->dev = tmp_ax->dev; - memcpy(skb_put(skb,count), ax->rbuff, count); - skb->mac.raw = skb->data; - skb->protocol = htons(ETH_P_AX25); - netif_rx(skb); - tmp_ax->rx_packets++; -} - -/* Encapsulate one AX.25 packet and stuff into a TTY queue. */ -static void ax_encaps(struct ax_disp *ax, unsigned char *icp, int len) -{ - unsigned char *p; - int actual, count; - struct mkiss_channel *mkiss = ax->tty->driver_data; - - if (ax->mtu != ax->dev->mtu + 73) /* Someone has been ifconfigging */ - ax_changedmtu(ax); - - 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); - return; - } - - p = icp; - - if (mkiss->magic != MKISS_DRIVER_MAGIC) { - switch (ax->crcmode) { - unsigned short crc; - - 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); - actual = ax->tty->driver.write(ax->tty, 0, ax->xbuff, count); - ax->tx_packets++; - ax->dev->trans_start = jiffies; - ax->xleft = count - actual; - ax->xhead = ax->xbuff + actual; - } else { - count = kiss_esc(p, (unsigned char *) ax->mkiss->xbuff, len); - ax->mkiss->tty->flags |= (1 << TTY_DO_WRITE_WAKEUP); - actual = ax->mkiss->tty->driver.write(ax->mkiss->tty, 0, ax->mkiss->xbuff, count); - ax->tx_packets++; - ax->mkiss->dev->trans_start = jiffies; - ax->mkiss->xleft = count - actual; - ax->mkiss->xhead = ax->mkiss->xbuff + actual; - } -} - -/* - * 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; - struct mkiss_channel *mkiss; - - /* 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); - - if (ax->mkiss != NULL) { - mkiss= ax->mkiss->tty->driver_data; - if (mkiss->magic == MKISS_DRIVER_MAGIC) - ax_unlock(ax->mkiss); - } - - netif_wake_queue(ax->dev); - return; - } - - actual = tty->driver.write(tty, 0, 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 = (struct ax_disp *) dev->priv; - struct mkiss_channel *mkiss = ax->tty->driver_data; - struct ax_disp *tmp_ax; - - tmp_ax = NULL; - - if (mkiss->magic == MKISS_DRIVER_MAGIC) { - if (skb->data[0] < 0x10) - skb->data[0] = skb->data[0] + 0x10; - tmp_ax = ax->mkiss; - } - - if (!netif_running(dev)) { - printk(KERN_ERR "mkiss: %s: xmit call when iface is down\n", dev->name); - return 1; - } - - if (tmp_ax != NULL) - if (netif_queue_stopped(tmp_ax->dev)) - return 1; - - if (tmp_ax != NULL) - if (netif_queue_stopped(dev)) { - printk(KERN_ERR "mkiss: dev busy while serial dev is free\n"); - ax_unlock(ax); - } - - if (netif_queue_stopped(dev)) { - /* - * May be we must check transmitter timeout here ? - * 14 Oct 1994 Dmitry Gorodchanin. - */ - if (jiffies - dev->trans_start < 20 * HZ) { - /* 20 sec timeout not reached */ - return 1; - } - - printk(KERN_ERR "mkiss: %s: transmit timed out, %s?\n", dev->name, - (ax->tty->driver.chars_in_buffer(ax->tty) || ax->xleft) ? - "bad line quality" : "driver error"); - - ax->xleft = 0; - ax->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP); - ax_unlock(ax); - } - - /* We were not busy, so we are now... :-) */ - if (skb != NULL) { - ax_lock(ax); - if (tmp_ax != NULL) - ax_lock(tmp_ax); - ax_encaps(ax, skb->data, skb->len); - kfree_skb(skb); - } - - return 0; -} - -#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) - -/* Return the frame type ID */ -static int ax_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, - void *daddr, void *saddr, unsigned len) -{ -#ifdef CONFIG_INET - if (type != htons(ETH_P_AX25)) - return ax25_encapsulate(skb, dev, type, daddr, saddr, len); -#endif - return 0; -} - - -static int ax_rebuild_header(struct sk_buff *skb) -{ -#ifdef CONFIG_INET - return ax25_rebuild_header(skb); -#else - return 0; -#endif -} - -#endif /* CONFIG_{AX25,AX25_MODULE} */ - -/* Open the low-level part of the AX25 channel. Easy! */ -static int ax_open(struct net_device *dev) -{ - struct ax_disp *ax = (struct ax_disp *) dev->priv; - unsigned long len; - - if (ax->tty == NULL) - return -ENODEV; - - /* - * Allocate the frame buffers: - * - * rbuff Receive buffer. - * xbuff Transmit buffer. - */ - len = dev->mtu * 2; - - /* - * allow for arrival of larger UDP packets, even if we say not to - * also fixes a bug in which SunOS sends 512-byte packets even with - * an MSS of 128 - */ - if (len < 576 * 2) - len = 576 * 2; - - if ((ax->rbuff = kmalloc(len + 4, GFP_KERNEL)) == NULL) - goto norbuff; - - if ((ax->xbuff = kmalloc(len + 4, GFP_KERNEL)) == NULL) - goto noxbuff; - - ax->mtu = dev->mtu + 73; - ax->buffsize = len; - ax->rcount = 0; - ax->xleft = 0; - - ax->flags &= (1 << AXF_INUSE); /* Clear ESCAPE & ERROR flags */ - - netif_start_queue(dev); - return 0; - -noxbuff: - kfree(ax->rbuff); - -norbuff: - return -ENOMEM; -} - - -/* Close the low-level part of the AX25 channel. Easy! */ -static int ax_close(struct net_device *dev) -{ - struct ax_disp *ax = (struct ax_disp *) dev->priv; - - if (ax->tty == NULL) - return -EBUSY; - - ax->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP); - - netif_stop_queue(dev); - - return 0; -} - -static int ax25_receive_room(struct tty_struct *tty) -{ - return 65536; /* We can handle an infinite amount of data. :-) */ -} - -/* - * 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 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; - - if (ax == NULL || ax->magic != AX25_MAGIC || !netif_running(ax->dev)) - return; - - /* - * Argh! mtu change time! - costs us the packet part received - * at the change - */ - if (ax->mtu != ax->dev->mtu + 73) - ax_changedmtu(ax); - - /* 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; - } - - kiss_unesc(ax, *cp++); - } -} - -static int ax25_open(struct tty_struct *tty) -{ - struct ax_disp *ax = (struct ax_disp *) tty->disc_data; - struct ax_disp *tmp_ax; - struct mkiss_channel *mkiss; - int err, cnt; - - /* First make sure we're not already connected. */ - if (ax && ax->magic == AX25_MAGIC) - return -EEXIST; - - /* OK. Find a free AX25 channel to use. */ - if ((ax = ax_alloc()) == NULL) - return -ENFILE; - - ax->tty = tty; - tty->disc_data = ax; - - ax->mkiss = NULL; - tmp_ax = NULL; - - if (tty->driver.flush_buffer) - tty->driver.flush_buffer(tty); - if (tty->ldisc.flush_buffer) - tty->ldisc.flush_buffer(tty); - - /* Restore default settings */ - ax->dev->type = ARPHRD_AX25; - - /* Perform the low-level AX25 initialization. */ - if ((err = ax_open(ax->dev))) - return err; - - mkiss = ax->tty->driver_data; - - if (mkiss->magic == MKISS_DRIVER_MAGIC) { - for (cnt = 1; cnt < ax25_maxdev; cnt++) { - if (ax25_ctrls[cnt]) { - if (netif_running(&ax25_ctrls[cnt]->dev)) { - if (ax == &ax25_ctrls[cnt]->ctrl) { - cnt--; - tmp_ax = &ax25_ctrls[cnt]->ctrl; - break; - } - } - } - } - } - - if (tmp_ax != NULL) { - ax->mkiss = tmp_ax; - tmp_ax->mkiss = ax; - } - - MOD_INC_USE_COUNT; - - /* Done. We have linked the TTY line to a channel. */ - return ax->dev->base_addr; -} - -static void ax25_close(struct tty_struct *tty) -{ - struct ax_disp *ax = (struct ax_disp *) tty->disc_data; - - /* First make sure we're connected. */ - if (ax == NULL || ax->magic != AX25_MAGIC) - return; - - unregister_netdev(ax->dev); - - tty->disc_data = 0; - ax->tty = NULL; - - ax_free(ax); - MOD_DEC_USE_COUNT; -} - - -static struct net_device_stats *ax_get_stats(struct net_device *dev) -{ - static struct net_device_stats stats; - struct ax_disp *ax = (struct ax_disp *) dev->priv; - - memset(&stats, 0, sizeof(struct net_device_stats)); - - stats.rx_packets = ax->rx_packets; - stats.tx_packets = ax->tx_packets; - 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; -} - - -/************************************************************************ - * STANDARD ENCAPSULATION * - ************************************************************************/ - -static int kiss_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; - - 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; -} - -/* - * 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) -{ - 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; - - len--; - - switch (c) { - 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 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); - - 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; - } - - if (!test_bit(AXF_ERROR, &ax->flags)) { - if (ax->rcount < ax->buffsize) { - ax->rbuff[ax->rcount++] = s; - return; - } - - ax->rx_over_errors++; - set_bit(AXF_ERROR, &ax->flags); - } -} - - -static int ax_set_mac_address(struct net_device *dev, void *addr) -{ - if (copy_from_user(dev->dev_addr, addr, AX25_ADDR_LEN)) - return -EFAULT; - return 0; -} - -static int ax_set_dev_mac_address(struct net_device *dev, void *addr) -{ - struct sockaddr *sa = addr; - - memcpy(dev->dev_addr, sa->sa_data, AX25_ADDR_LEN); - - return 0; -} - - -/* Perform I/O control on an active ax25 channel. */ -static int ax25_disp_ioctl(struct tty_struct *tty, void *file, int cmd, void *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; - - 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 *)arg); - - case SIOCSIFENCAP: - if (get_user(tmp, (int *)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); - - default: - return -ENOIOCTLCMD; - } -} - -static int ax_open_dev(struct net_device *dev) -{ - struct ax_disp *ax = (struct ax_disp *) dev->priv; - - if (ax->tty == NULL) - return -ENODEV; - - return 0; -} - - -/* Initialize the driver. Called by network startup. */ -static int ax25_init(struct net_device *dev) -{ - struct ax_disp *ax = (struct ax_disp *) dev->priv; - - 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; - - /* Set up the "AX25 Control Block". (And clear statistics) */ - memset(ax, 0, sizeof (struct ax_disp)); - ax->magic = AX25_MAGIC; - ax->dev = dev; - - /* 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; - - memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN); - memcpy(dev->dev_addr, ax25_test, AX25_ADDR_LEN); - - dev_init_buffers(dev); - - /* New-style flags. */ - dev->flags = 0; - - return 0; -} - - -/* ******************************************************************** */ -/* * Init MKISS driver * */ -/* ******************************************************************** */ - -static int __init mkiss_init_driver(void) -{ - int status; - - printk(banner); - - if (ax25_maxdev < 4) - ax25_maxdev = 4; /* Sanity */ - - 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 void __exit mkiss_exit_driver(void) -{ - int i; - - 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); -} - -MODULE_AUTHOR("Hans Albas PE1AYX <hans@esrac.ele.tue.nl>"); -MODULE_DESCRIPTION("KISS driver for AX.25 over TTYs"); -MODULE_PARM(ax25_maxdev, "i"); -MODULE_PARM_DESC(ax25_maxdev, "number of MKISS devices"); - -module_init(mkiss_init_driver); -module_exit(mkiss_exit_driver); - |