patch-2.3.21 linux/drivers/net/wan/sdla_x25.c
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- Lines: 2436
- Date:
Mon Oct 11 10:13:25 1999
- Orig file:
v2.3.20/linux/drivers/net/wan/sdla_x25.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.3.20/linux/drivers/net/wan/sdla_x25.c linux/drivers/net/wan/sdla_x25.c
@@ -0,0 +1,2435 @@
+/*****************************************************************************
+* sdla_x25.c WANPIPE(tm) Multiprotocol WAN Link Driver. X.25 module.
+*
+* Author: Gene Kozin <genek@compuserve.com>
+*
+* Copyright: (c) 1995-1997 Sangoma Technologies Inc.
+*
+* This program is free software; you can redistribute it and/or
+* modify it under the terms of the GNU General Public License
+* as published by the Free Software Foundation; either version
+* 2 of the License, or (at your option) any later version.
+* ============================================================================
+* Mar 15, 1998 Alan Cox o 2.1.x porting
+* Nov 27, 1997 Jaspreet Singh o Added protection against enabling of irqs
+* when they are disabled.
+* Nov 17, 1997 Farhan Thawar o Added IPX support
+* o Changed if_send() to now buffer packets when
+* the board is busy
+* o Removed queueing of packets via the polling
+* routing
+* o Changed if_send() critical flags to properly
+* handle race conditions
+* Nov 06, 1997 Farhan Thawar o Added support for SVC timeouts
+* o Changed PVC encapsulation to ETH_P_IP
+* Jul 21, 1997 Jaspreet Singh o Fixed freeing up of buffers using kfree()
+* when packets are received.
+* Mar 11, 1997 Farhan Thawar Version 3.1.1
+* o added support for V35
+* o changed if_send() to return 0 if
+* wandev.critical() is true
+* o free socket buffer in if_send() if
+* returning 0
+* o added support for single '@' address to
+* accept all incoming calls
+* o fixed bug in set_chan_state() to disconnect
+* Jan 15, 1997 Gene Kozin Version 3.1.0
+* o implemented exec() entry point
+* Jan 07, 1997 Gene Kozin Initial version.
+*****************************************************************************/
+
+
+#include <linux/kernel.h> /* printk(), and other useful stuff */
+#include <linux/stddef.h> /* offsetof(), etc. */
+#include <linux/errno.h> /* return codes */
+#include <linux/string.h> /* inline memset(), etc. */
+#include <linux/malloc.h> /* kmalloc(), kfree() */
+#include <linux/wanrouter.h> /* WAN router definitions */
+#include <linux/wanpipe.h> /* WANPIPE common user API definitions */
+#include <asm/byteorder.h> /* htons(), etc. */
+#include <asm/uaccess.h>
+
+#define _GNUC_
+#include <linux/sdla_x25.h> /* X.25 firmware API definitions */
+
+/****** Defines & Macros ****************************************************/
+
+#define CMD_OK 0 /* normal firmware return code */
+#define CMD_TIMEOUT 0xFF /* firmware command timed out */
+#define MAX_CMD_RETRY 10 /* max number of firmware retries */
+
+#define X25_CHAN_MTU 4096 /* unfragmented logical channel MTU */
+#define X25_HRDHDR_SZ 7 /* max encapsulation header size */
+#define X25_CONCT_TMOUT (90*HZ) /* link connection timeout */
+#define X25_RECON_TMOUT (10*HZ) /* link connection timeout */
+#define CONNECT_TIMEOUT (90*HZ) /* link connection timeout */
+#define HOLD_DOWN_TIME (30*HZ) /* link hold down time */
+
+/* For IPXWAN */
+#define CVHexToAscii(b) (((unsigned char)(b) > (unsigned char)9) ? ((unsigned char)'A' + ((unsigned char)(b) - (unsigned char)10)) : ((unsigned char)'0' + (unsigned char)(b)))
+
+/****** Data Structures *****************************************************/
+
+/* This is an extention of the 'struct net_device' we create for each network
+ * interface to keep the rest of X.25 channel-specific data.
+ */
+typedef struct x25_channel
+{
+ char name[WAN_IFNAME_SZ+1]; /* interface name, ASCIIZ */
+ char addr[WAN_ADDRESS_SZ+1]; /* media address, ASCIIZ */
+ unsigned lcn; /* logical channel number */
+ unsigned tx_pkt_size;
+ unsigned short protocol; /* ethertype, 0 - multiplexed */
+ char svc; /* 0 - permanent, 1 - switched */
+ char state; /* channel state */
+ char drop_sequence; /* mark sequence for dropping */
+ unsigned long state_tick; /* time of the last state change */
+ unsigned idle_timeout; /* sec, before disconnecting */
+ unsigned long i_timeout_sofar; /* # of sec's we've been idle */
+ unsigned hold_timeout; /* sec, before re-connecting */
+ unsigned long tick_counter; /* counter for transmit time out */
+ char devtint; /* Weather we should dev_tint() */
+ struct sk_buff* rx_skb; /* receive socket buffer */
+ struct sk_buff* tx_skb; /* transmit socket buffer */
+ sdla_t* card; /* -> owner */
+ int ch_idx;
+ struct net_device_stats ifstats; /* interface statistics */
+} x25_channel_t;
+
+typedef struct x25_call_info
+{
+ char dest[17]; /* ASCIIZ destination address */
+ char src[17]; /* ASCIIZ source address */
+ char nuser; /* number of user data bytes */
+ unsigned char user[127]; /* user data */
+ char nfacil; /* number of facilities */
+ struct
+ {
+ unsigned char code;
+ unsigned char parm;
+ } facil[64]; /* facilities */
+} x25_call_info_t;
+
+/****** Function Prototypes *************************************************/
+
+/* WAN link driver entry points. These are called by the WAN router module. */
+static int update (wan_device_t* wandev);
+static int new_if (wan_device_t* wandev, struct net_device* dev,
+ wanif_conf_t* conf);
+static int del_if (wan_device_t* wandev, struct net_device* dev);
+
+/* WANPIPE-specific entry points */
+static int wpx_exec (struct sdla* card, void* u_cmd, void* u_data);
+
+/* Network device interface */
+static int if_init (struct net_device* dev);
+static int if_open (struct net_device* dev);
+static int if_close (struct net_device* dev);
+static int if_header (struct sk_buff* skb, struct net_device* dev,
+ unsigned short type, void* daddr, void* saddr, unsigned len);
+static int if_rebuild_hdr (struct sk_buff* skb);
+static int if_send (struct sk_buff* skb, struct net_device* dev);
+static struct net_device_stats * if_stats (struct net_device* dev);
+
+/* Interrupt handlers */
+static void wpx_isr (sdla_t* card);
+static void rx_intr (sdla_t* card);
+static void tx_intr (sdla_t* card);
+static void status_intr (sdla_t* card);
+static void event_intr (sdla_t* card);
+static void spur_intr (sdla_t* card);
+
+/* Background polling routines */
+static void wpx_poll (sdla_t* card);
+static void poll_disconnected (sdla_t* card);
+static void poll_connecting (sdla_t* card);
+static void poll_active (sdla_t* card);
+
+/* X.25 firmware interface functions */
+static int x25_get_version (sdla_t* card, char* str);
+static int x25_configure (sdla_t* card, TX25Config* conf);
+static int x25_get_err_stats (sdla_t* card);
+static int x25_get_stats (sdla_t* card);
+static int x25_set_intr_mode (sdla_t* card, int mode);
+static int x25_close_hdlc (sdla_t* card);
+static int x25_open_hdlc (sdla_t* card);
+static int x25_setup_hdlc (sdla_t* card);
+static int x25_set_dtr (sdla_t* card, int dtr);
+static int x25_get_chan_conf (sdla_t* card, x25_channel_t* chan);
+static int x25_place_call (sdla_t* card, x25_channel_t* chan);
+static int x25_accept_call (sdla_t* card, int lcn, int qdm);
+static int x25_clear_call (sdla_t* card, int lcn, int cause, int diagn);
+static int x25_send (sdla_t* card, int lcn, int qdm, int len, void* buf);
+static int x25_fetch_events (sdla_t* card);
+static int x25_error (sdla_t* card, int err, int cmd, int lcn);
+
+/* X.25 asynchronous event handlers */
+static int incoming_call (sdla_t* card, int cmd, int lcn, TX25Mbox* mb);
+static int call_accepted (sdla_t* card, int cmd, int lcn, TX25Mbox* mb);
+static int call_cleared (sdla_t* card, int cmd, int lcn, TX25Mbox* mb);
+static int timeout_event (sdla_t* card, int cmd, int lcn, TX25Mbox* mb);
+static int restart_event (sdla_t* card, int cmd, int lcn, TX25Mbox* mb);
+
+/* Miscellaneous functions */
+static int connect (sdla_t* card);
+static int disconnect (sdla_t* card);
+static struct net_device* get_dev_by_lcn(wan_device_t* wandev, unsigned lcn);
+static int chan_connect (struct net_device* dev);
+static int chan_disc (struct net_device* dev);
+static void set_chan_state (struct net_device* dev, int state);
+static int chan_send (struct net_device* dev, struct sk_buff* skb);
+static unsigned char bps_to_speed_code (unsigned long bps);
+static unsigned int dec_to_uint (unsigned char* str, int len);
+static unsigned int hex_to_uint (unsigned char* str, int len);
+static void parse_call_info (unsigned char* str, x25_call_info_t* info);
+
+/* IPX functions */
+static void switch_net_numbers(unsigned char *sendpacket, unsigned long network_number, unsigned char incoming);
+static int handle_IPXWAN(unsigned char *sendpacket, char *devname, unsigned char enable_IPX, unsigned long network_number, unsigned short proto);
+
+extern void disable_irq(unsigned int);
+extern void enable_irq(unsigned int);
+
+/****** Global Data **********************************************************
+ * Note: All data must be explicitly initialized!!!
+ */
+
+/****** Public Functions ****************************************************/
+
+/*============================================================================
+ * X.25 Protocol Initialization routine.
+ *
+ * This routine is called by the main WANPIPE module during setup. At this
+ * point adapter is completely initialized and X.25 firmware is running.
+ * o read firmware version (to make sure it's alive)
+ * o configure adapter
+ * o initialize protocol-specific fields of the adapter data space.
+ *
+ * Return: 0 o.k.
+ * < 0 failure.
+ */
+int wpx_init (sdla_t* card, wandev_conf_t* conf)
+{
+ union
+ {
+ char str[80];
+ TX25Config cfg;
+ } u;
+
+ /* Verify configuration ID */
+ if (conf->config_id != WANCONFIG_X25)
+ {
+ printk(KERN_INFO "%s: invalid configuration ID %u!\n",
+ card->devname, conf->config_id)
+ ;
+ return -EINVAL;
+ }
+
+ /* Initialize protocol-specific fields */
+ card->mbox = (void*)(card->hw.dpmbase + X25_MBOX_OFFS);
+ card->rxmb = (void*)(card->hw.dpmbase + X25_RXMBOX_OFFS);
+ card->flags = (void*)(card->hw.dpmbase + X25_STATUS_OFFS);
+
+ /* Read firmware version. Note that when adapter initializes, it
+ * clears the mailbox, so it may appear that the first command was
+ * executed successfully when in fact it was merely erased. To work
+ * around this, we execute the first command twice.
+ */
+ if (x25_get_version(card, NULL) || x25_get_version(card, u.str))
+ return -EIO
+ ;
+ printk(KERN_INFO "%s: running X.25 firmware v%s\n",
+ card->devname, u.str)
+ ;
+
+ /* Configure adapter. Here we set resonable defaults, then parse
+ * device configuration structure and set configuration options.
+ * Most configuration options are verified and corrected (if
+ * necessary) since we can't rely on the adapter to do so and don't
+ * want it to fail either.
+ */
+ memset(&u.cfg, 0, sizeof(u.cfg));
+ u.cfg.t1 = 3;
+ u.cfg.n2 = 10;
+ u.cfg.autoHdlc = 1; /* automatic HDLC connection */
+ u.cfg.hdlcWindow = 7;
+ u.cfg.pktWindow = 2;
+ u.cfg.station = 1; /* DTE */
+ u.cfg.options = 0x00B0; /* disable D-bit pragmatics */
+ u.cfg.ccittCompat = 1988;
+ u.cfg.t10t20 = 30;
+ u.cfg.t11t21 = 30;
+ u.cfg.t12t22 = 30;
+ u.cfg.t13t23 = 30;
+ u.cfg.t16t26 = 30;
+ u.cfg.t28 = 30;
+ u.cfg.r10r20 = 5;
+ u.cfg.r12r22 = 5;
+ u.cfg.r13r23 = 5;
+ u.cfg.responseOpt = 1; /* RR's after every packet */
+
+ if (conf->clocking != WANOPT_EXTERNAL)
+ u.cfg.baudRate = bps_to_speed_code(conf->bps)
+ ;
+ if (conf->station != WANOPT_DTE)
+ {
+ u.cfg.station = 0; /* DCE mode */
+ }
+ if (conf->interface != WANOPT_RS232 ) {
+ u.cfg.hdlcOptions |= 0x80; /* V35 mode */
+ }
+ /* adjust MTU */
+ if (!conf->mtu || (conf->mtu >= 1024))
+ card->wandev.mtu = 1024
+ ;
+ else if (conf->mtu >= 512)
+ card->wandev.mtu = 512
+ ;
+ else if (conf->mtu >= 256)
+ card->wandev.mtu = 256
+ ;
+ else if (conf->mtu >= 128)
+ card->wandev.mtu = 128
+ ;
+ else card->wandev.mtu = 64;
+ u.cfg.defPktSize = u.cfg.pktMTU = card->wandev.mtu;
+
+ if (conf->u.x25.hi_pvc)
+ {
+ card->u.x.hi_pvc = min(conf->u.x25.hi_pvc, 4095);
+ card->u.x.lo_pvc = min(conf->u.x25.lo_pvc, card->u.x.hi_pvc);
+ }
+ if (conf->u.x25.hi_svc)
+ {
+ card->u.x.hi_svc = min(conf->u.x25.hi_svc, 4095);
+ card->u.x.lo_svc = min(conf->u.x25.lo_svc, card->u.x.hi_svc);
+ }
+ u.cfg.loPVC = card->u.x.lo_pvc;
+ u.cfg.hiPVC = card->u.x.hi_pvc;
+ u.cfg.loTwoWaySVC = card->u.x.lo_svc;
+ u.cfg.hiTwoWaySVC = card->u.x.hi_svc;
+
+ if (conf->u.x25.hdlc_window)
+ u.cfg.hdlcWindow = min(conf->u.x25.hdlc_window, 7)
+ ;
+ if (conf->u.x25.pkt_window)
+ u.cfg.pktWindow = min(conf->u.x25.pkt_window, 7)
+ ;
+ if (conf->u.x25.t1)
+ u.cfg.t1 = min(conf->u.x25.t1, 30)
+ ;
+ u.cfg.t2 = min(conf->u.x25.t2, 29);
+ u.cfg.t4 = min(conf->u.x25.t4, 240);
+ if (conf->u.x25.n2)
+ u.cfg.n2 = min(conf->u.x25.n2, 30)
+ ;
+ if (conf->u.x25.ccitt_compat)
+ u.cfg.ccittCompat = conf->u.x25.ccitt_compat
+ ;
+
+ /* initialize adapter */
+ if ((x25_configure(card, &u.cfg) != CMD_OK) ||
+ (x25_close_hdlc(card) != CMD_OK) || /* close HDLC link */
+ (x25_set_dtr(card, 0) != CMD_OK)) /* drop DTR */
+ return -EIO
+ ;
+
+ /* Initialize protocol-specific fields of adapter data space */
+ card->wandev.bps = conf->bps;
+ card->wandev.interface = conf->interface;
+ card->wandev.clocking = conf->clocking;
+ card->wandev.station = conf->station;
+ card->isr = &wpx_isr;
+ card->poll = &wpx_poll;
+ card->exec = &wpx_exec;
+ card->wandev.update = &update;
+ card->wandev.new_if = &new_if;
+ card->wandev.del_if = &del_if;
+ card->wandev.state = WAN_DISCONNECTED;
+ card->wandev.enable_tx_int = 0;
+ card->irq_dis_if_send_count = 0;
+ card->irq_dis_poll_count = 0;
+ card->wandev.enable_IPX = conf->enable_IPX;
+
+ if (conf->network_number)
+ card->wandev.network_number = conf->network_number;
+ else
+ card->wandev.network_number = 0xDEADBEEF;
+ return 0;
+}
+
+/******* WAN Device Driver Entry Points *************************************/
+
+/*============================================================================
+ * Update device status & statistics.
+ */
+static int update (wan_device_t* wandev)
+{
+ sdla_t* card;
+
+ /* sanity checks */
+ if ((wandev == NULL) || (wandev->private == NULL))
+ return -EFAULT;
+ if (wandev->state == WAN_UNCONFIGURED)
+ return -ENODEV;
+ if (test_and_set_bit(0, (void*)&wandev->critical))
+ return -EAGAIN;
+ card = wandev->private;
+
+ x25_get_err_stats(card);
+ x25_get_stats(card);
+ wandev->critical = 0;
+ return 0;
+}
+
+/*============================================================================
+ * Create new logical channel.
+ * This routine is called by the router when ROUTER_IFNEW IOCTL is being
+ * handled.
+ * o parse media- and hardware-specific configuration
+ * o make sure that a new channel can be created
+ * o allocate resources, if necessary
+ * o prepare network device structure for registaration.
+ *
+ * Return: 0 o.k.
+ * < 0 failure (channel will not be created)
+ */
+static int new_if (wan_device_t* wandev, struct net_device* dev, wanif_conf_t* conf)
+{
+ sdla_t* card = wandev->private;
+ x25_channel_t* chan;
+ int err = 0;
+
+ if ((conf->name[0] == '\0') || (strlen(conf->name) > WAN_IFNAME_SZ))
+ {
+ printk(KERN_INFO "%s: invalid interface name!\n",
+ card->devname)
+ ;
+ return -EINVAL;
+ }
+
+ /* allocate and initialize private data */
+ chan = kmalloc(sizeof(x25_channel_t), GFP_KERNEL);
+ if (chan == NULL)
+ return -ENOMEM
+ ;
+ memset(chan, 0, sizeof(x25_channel_t));
+ strcpy(chan->name, conf->name);
+ chan->card = card;
+ chan->protocol = ETH_P_IP;
+ chan->tx_skb = chan->rx_skb = NULL;
+
+ /* verify media address */
+ if (conf->addr[0] == '@') /* SVC */
+ {
+ chan->svc = 1;
+ strncpy(chan->addr, &conf->addr[1], WAN_ADDRESS_SZ);
+
+ /* Set channel timeouts (default if not specified) */
+ chan->idle_timeout = (conf->idle_timeout) ? conf->idle_timeout : 90;
+ chan->hold_timeout = (conf->hold_timeout) ? conf->hold_timeout : 10;
+ }
+ else if (is_digit(conf->addr[0])) /* PVC */
+ {
+ int lcn = dec_to_uint(conf->addr, 0);
+
+ if ((lcn >= card->u.x.lo_pvc) && (lcn <= card->u.x.hi_pvc))
+ {
+ chan->lcn = lcn;
+ }
+ else
+ {
+ printk(KERN_ERR
+ "%s: PVC %u is out of range on interface %s!\n",
+ wandev->name, lcn, chan->name)
+ ;
+ err = -EINVAL;
+ }
+ }
+ else
+ {
+ printk(KERN_ERR
+ "%s: invalid media address on interface %s!\n",
+ wandev->name, chan->name)
+ ;
+ err = -EINVAL;
+ }
+ if (err)
+ {
+ kfree(chan);
+ return err;
+ }
+
+ /* prepare network device data space for registration */
+ dev->name = chan->name;
+ dev->init = &if_init;
+ dev->priv = chan;
+ return 0;
+}
+
+/*============================================================================
+ * Delete logical channel.
+ */
+static int del_if (wan_device_t* wandev, struct net_device* dev)
+{
+ if (dev->priv)
+ {
+ kfree(dev->priv);
+ dev->priv = NULL;
+ }
+ return 0;
+}
+
+/****** WANPIPE-specific entry points ***************************************/
+
+/*============================================================================
+ * Execute adapter interface command.
+ */
+
+static int wpx_exec (struct sdla* card, void* u_cmd, void* u_data)
+{
+ TX25Mbox* mbox = card->mbox;
+ int retry = MAX_CMD_RETRY;
+ int err, len;
+ TX25Cmd cmd;
+
+ if(copy_from_user((void*)&cmd, u_cmd, sizeof(cmd)))
+ return -EFAULT;
+
+ /* execute command */
+
+ do
+ {
+ memcpy(&mbox->cmd, &cmd, sizeof(cmd));
+ if (cmd.length)
+ {
+ if(copy_from_user((void*)&mbox->data, u_data, cmd.length))
+ return-EFAULT;
+ }
+ if (sdla_exec(mbox))
+ err = mbox->cmd.result
+ ;
+ else return -EIO;
+ }
+ while (err && retry-- && x25_error(card, err, cmd.command, cmd.lcn));
+
+ /* return result */
+ if(copy_to_user(u_cmd, (void*)&mbox->cmd, sizeof(TX25Cmd)))
+ return -EFAULT;
+ len = mbox->cmd.length;
+ if (len && u_data && copy_to_user(u_data, (void*)&mbox->data, len))
+ return -EFAULT;
+ return 0;
+}
+
+/****** Network Device Interface ********************************************/
+
+/*============================================================================
+ * Initialize Linux network interface.
+ *
+ * This routine is called only once for each interface, during Linux network
+ * interface registration. Returning anything but zero will fail interface
+ * registration.
+ */
+static int if_init (struct net_device* dev)
+{
+ x25_channel_t* chan = dev->priv;
+ sdla_t* card = chan->card;
+ wan_device_t* wandev = &card->wandev;
+
+ /* Initialize device driver entry points */
+ dev->open = &if_open;
+ dev->stop = &if_close;
+ dev->hard_header = &if_header;
+ dev->rebuild_header = &if_rebuild_hdr;
+ dev->hard_start_xmit = &if_send;
+ dev->get_stats = &if_stats;
+
+ /* Initialize media-specific parameters */
+ dev->type = 30; /* ARP h/w type */
+ dev->mtu = X25_CHAN_MTU;
+ dev->hard_header_len = X25_HRDHDR_SZ; /* media header length */
+ dev->addr_len = 2; /* hardware address length */
+ if (!chan->svc)
+ *(unsigned short*)dev->dev_addr = htons(chan->lcn);
+
+ /* Initialize hardware parameters (just for reference) */
+ dev->irq = wandev->irq;
+ dev->dma = wandev->dma;
+ dev->base_addr = wandev->ioport;
+ dev->mem_start = (unsigned long)wandev->maddr;
+ dev->mem_end = dev->mem_end + wandev->msize - 1;
+
+ /* Set transmit buffer queue length */
+ dev->tx_queue_len = 10;
+
+ /* Initialize socket buffers */
+
+ dev_init_buffers(dev);
+ set_chan_state(dev, WAN_DISCONNECTED);
+ return 0;
+}
+
+/*============================================================================
+ * Open network interface.
+ * o prevent module from unloading by incrementing use count
+ * o if link is disconnected then initiate connection
+ *
+ * Return 0 if O.k. or errno.
+ */
+static int if_open (struct net_device* dev)
+{
+ x25_channel_t* chan = dev->priv;
+ sdla_t* card = chan->card;
+
+ if (dev->start)
+ return -EBUSY; /* only one open is allowed */
+
+ if (test_and_set_bit(0, (void*)&card->wandev.critical))
+ return -EAGAIN;
+
+ dev->interrupt = 0;
+ dev->tbusy = 0;
+ dev->start = 1;
+ wanpipe_open(card);
+
+ /* If this is the first open, initiate physical connection */
+ if (card->open_cnt == 1)
+ connect(card);
+ card->wandev.critical = 0;
+ return 0;
+}
+
+/*============================================================================
+ * Close network interface.
+ * o reset flags.
+ * o if there's no more open channels then disconnect physical link.
+ */
+static int if_close (struct net_device* dev)
+{
+ x25_channel_t* chan = dev->priv;
+ sdla_t* card = chan->card;
+
+ if (test_and_set_bit(0, (void*)&card->wandev.critical))
+ return -EAGAIN;
+
+ dev->start = 0;
+ if ((chan->state == WAN_CONNECTED) || (chan->state == WAN_CONNECTING))
+ chan_disc(dev);
+
+ wanpipe_close(card);
+
+ /* If this is the last close, disconnect physical link */
+ if (!card->open_cnt)
+ disconnect(card);
+
+ card->wandev.critical = 0;
+ return 0;
+}
+
+/*============================================================================
+ * Build media header.
+ * o encapsulate packet according to encapsulation type.
+ *
+ * The trick here is to put packet type (Ethertype) into 'protocol' field of
+ * the socket buffer, so that we don't forget it. If encapsulation fails,
+ * set skb->protocol to 0 and discard packet later.
+ *
+ * Return: media header length.
+ */
+static int if_header (struct sk_buff* skb, struct net_device* dev,
+ unsigned short type, void* daddr, void* saddr, unsigned len)
+{
+ x25_channel_t* chan = dev->priv;
+ int hdr_len = dev->hard_header_len;
+
+ skb->protocol = type;
+ if (!chan->protocol)
+ {
+ hdr_len = wanrouter_encapsulate(skb, dev);
+ if (hdr_len < 0)
+ {
+ hdr_len = 0;
+ skb->protocol = 0;
+ }
+ }
+ return hdr_len;
+}
+
+/*============================================================================
+ * Re-build media header.
+ *
+ * Return: 1 physical address resolved.
+ * 0 physical address not resolved
+ */
+
+static int if_rebuild_hdr (struct sk_buff* skb)
+{
+ struct net_device *dev=skb->dev;
+ x25_channel_t* chan = dev->priv;
+ sdla_t* card = chan->card;
+
+ printk(KERN_INFO "%s: rebuild_header() called for interface %s!\n",
+ card->devname, dev->name);
+ return 1;
+}
+
+/*============================================================================
+ * Send a packet on a network interface.
+ * o set tbusy flag (marks start of the transmission).
+ * o check link state. If link is not up, then drop the packet.
+ * o check channel status. If it's down then initiate a call.
+ * o pass a packet to corresponding WAN device.
+ * o free socket buffer
+ *
+ * Return: 0 complete (socket buffer must be freed)
+ * non-0 packet may be re-transmitted (tbusy must be set)
+ *
+ * Notes:
+ * 1. This routine is called either by the protocol stack or by the "net
+ * bottom half" (with interrupts enabled).
+ * 2. Setting tbusy flag will inhibit further transmit requests from the
+ * protocol stack and can be used for flow control with protocol layer.
+ */
+
+static int if_send (struct sk_buff* skb, struct net_device* dev)
+{
+ x25_channel_t* chan = dev->priv;
+ sdla_t* card = chan->card;
+ struct net_device *dev2;
+ TX25Status* status = card->flags;
+ unsigned long host_cpu_flags;
+
+ if (dev->tbusy)
+ {
+ ++chan->ifstats.rx_dropped;
+ if ((jiffies - chan->tick_counter) < (5*HZ))
+ {
+ return dev->tbusy;
+ }
+ printk(KERN_INFO "%s: Transmit time out %s!\n",
+ card->devname, dev->name)
+ ;
+ for( dev2 = card->wandev.dev; dev2; dev2 = dev2->slave)
+ {
+ dev2->tbusy = 0;
+ }
+ }
+ chan->tick_counter = jiffies;
+
+ disable_irq(card->hw.irq);
+ ++card->irq_dis_if_send_count;
+
+ if (test_and_set_bit(0, (void*)&card->wandev.critical))
+ {
+ printk(KERN_INFO "Hit critical in if_send()!\n");
+ if (card->wandev.critical == CRITICAL_IN_ISR)
+ {
+ card->wandev.enable_tx_int = 1;
+ dev->tbusy = 1;
+
+ save_flags(host_cpu_flags);
+ cli();
+ if ((!(--card->irq_dis_if_send_count)) &&
+ (!card->irq_dis_poll_count))
+ enable_irq(card->hw.irq);
+ restore_flags(host_cpu_flags);
+
+ return dev->tbusy;
+ }
+ dev_kfree_skb(skb);
+
+ save_flags(host_cpu_flags);
+ cli();
+ if ((!(--card->irq_dis_if_send_count)) &&
+ (!card->irq_dis_poll_count))
+ enable_irq(card->hw.irq);
+ restore_flags(host_cpu_flags);
+
+ return dev->tbusy;
+ }
+
+ /* Below is only until we have per-channel IPX going.... */
+ if(!(chan->svc))
+ chan->protocol = skb->protocol;
+
+ if (card->wandev.state != WAN_CONNECTED)
+ ++chan->ifstats.tx_dropped;
+
+ /* Below is only until we have per-channel IPX going.... */
+ else if ( (chan->svc) && (chan->protocol && (chan->protocol != skb->protocol)))
+ {
+ printk(KERN_INFO
+ "%s: unsupported Ethertype 0x%04X on interface %s!\n",
+ card->devname, skb->protocol, dev->name);
+ ++chan->ifstats.tx_errors;
+ }
+ else switch (chan->state)
+ {
+ case WAN_DISCONNECTED:
+ /* Try to establish connection. If succeded, then start
+ * transmission, else drop a packet.
+ */
+ if (chan_connect(dev) != 0)
+ {
+ ++chan->ifstats.tx_dropped;
+ ++card->wandev.stats.tx_dropped;
+ break;
+ }
+ /* fall through */
+
+ case WAN_CONNECTED:
+ if( skb->protocol == ETH_P_IPX )
+ {
+ if(card->wandev.enable_IPX)
+ {
+ switch_net_numbers( skb->data,
+ card->wandev.network_number, 0);
+ }
+ else
+ {
+ ++card->wandev.stats.tx_dropped;
+ ++chan->ifstats.tx_dropped;
+ goto tx_done;
+ }
+ }
+ dev->trans_start = jiffies;
+ if(chan_send(dev, skb))
+ {
+ dev->tbusy = 1;
+ status->imask |= 0x2;
+ }
+ break;
+
+ default:
+ ++chan->ifstats.tx_dropped;
+ ++card->wandev.stats.tx_dropped;
+ }
+tx_done:
+ if (!dev->tbusy)
+ dev_kfree_skb(skb);
+
+ card->wandev.critical = 0;
+ save_flags(host_cpu_flags);
+ cli();
+ if ((!(--card->irq_dis_if_send_count)) && (!card->irq_dis_poll_count))
+ enable_irq(card->hw.irq);
+ restore_flags(host_cpu_flags);
+ return dev->tbusy;
+}
+
+/*============================================================================
+ * Get Ethernet-style interface statistics.
+ * Return a pointer to struct net_device_stats
+ */
+
+static struct net_device_stats* if_stats (struct net_device* dev)
+{
+ x25_channel_t* chan = dev->priv;
+ if(chan==NULL)
+ return NULL;
+ return &chan->ifstats;
+}
+
+/****** Interrupt Handlers **************************************************/
+
+/*============================================================================
+ * X.25 Interrupt Service Routine.
+ */
+
+static void wpx_isr (sdla_t* card)
+{
+ TX25Status* status = card->flags;
+ struct net_device *dev;
+ unsigned long host_cpu_flags;
+
+ card->in_isr = 1;
+ card->buff_int_mode_unbusy = 0;
+
+ if (test_and_set_bit(0, (void*)&card->wandev.critical))
+ {
+
+ printk(KERN_INFO "wpx_isr: %s, wandev.critical set to 0x%02X, int type = 0x%02X\n", card->devname, card->wandev.critical, status->iflags);
+ card->in_isr = 0;
+ return;
+ }
+
+ /* For all interrupts set the critical flag to CRITICAL_RX_INTR.
+ * If the if_send routine is called with this flag set it will set
+ * the enable transmit flag to 1. (for a delayed interrupt)
+ */
+ card->wandev.critical = CRITICAL_IN_ISR;
+
+ switch (status->iflags)
+ {
+ case 0x01: /* receive interrupt */
+ rx_intr(card);
+ break;
+
+ case 0x02: /* transmit interrupt */
+ tx_intr(card);
+ card->buff_int_mode_unbusy = 1;
+ status->imask &= ~0x2;
+ break;
+
+ case 0x04: /* modem status interrupt */
+ status_intr(card);
+ break;
+
+ case 0x10: /* network event interrupt */
+ event_intr(card);
+ break;
+
+ default: /* unwanted interrupt */
+ spur_intr(card);
+ }
+ card->wandev.critical = CRITICAL_INTR_HANDLED;
+ if( card->wandev.enable_tx_int)
+ {
+ card->wandev.enable_tx_int = 0;
+ status->imask |= 0x2;
+ }
+ save_flags(host_cpu_flags);
+ cli();
+ card->in_isr = 0;
+ status->iflags = 0; /* clear interrupt condition */
+ card->wandev.critical = 0;
+ restore_flags(host_cpu_flags);
+
+ if(card->buff_int_mode_unbusy)
+ {
+ for(dev = card->wandev.dev; dev; dev = dev->slave)
+ {
+ if(((x25_channel_t*)dev->priv)->devtint)
+ {
+ mark_bh(NET_BH);
+ return;
+ }
+ }
+ }
+}
+
+/*============================================================================
+ * Receive interrupt handler.
+ * This routine handles fragmented IP packets using M-bit according to the
+ * RFC1356.
+ * o map ligical channel number to network interface.
+ * o allocate socket buffer or append received packet to the existing one.
+ * o if M-bit is reset (i.e. it's the last packet in a sequence) then
+ * decapsulate packet and pass socket buffer to the protocol stack.
+ *
+ * Notes:
+ * 1. When allocating a socket buffer, if M-bit is set then more data is
+ * comming and we have to allocate buffer for the maximum IP packet size
+ * expected on this channel.
+ * 2. If something goes wrong and X.25 packet has to be dropped (e.g. no
+ * socket buffers available) the whole packet sequence must be discarded.
+ */
+
+static void rx_intr (sdla_t* card)
+{
+ TX25Mbox* rxmb = card->rxmb;
+ unsigned lcn = rxmb->cmd.lcn; /* logical channel number */
+ unsigned len = rxmb->cmd.length; /* packet length */
+ unsigned qdm = rxmb->cmd.qdm; /* Q,D and M bits */
+ wan_device_t* wandev = &card->wandev;
+ struct net_device* dev = get_dev_by_lcn(wandev, lcn);
+ x25_channel_t* chan;
+ struct sk_buff* skb;
+ void* bufptr;
+
+ if (dev == NULL)
+ {
+ /* Invalid channel, discard packet */
+ printk(KERN_INFO "%s: receiving on orphaned LCN %d!\n",
+ card->devname, lcn);
+ return;
+ }
+
+ chan = dev->priv;
+ chan->i_timeout_sofar = jiffies;
+ if (chan->drop_sequence)
+ {
+ if (!(qdm & 0x01)) chan->drop_sequence = 0;
+ return;
+ }
+
+ skb = chan->rx_skb;
+ if (skb == NULL)
+ {
+ /* Allocate new socket buffer */
+ int bufsize = (qdm & 0x01) ? dev->mtu : len;
+
+ skb = dev_alloc_skb(bufsize + dev->hard_header_len);
+ if (skb == NULL)
+ {
+ printk(KERN_INFO "%s: no socket buffers available!\n",
+ card->devname);
+ chan->drop_sequence = 1; /* set flag */
+ ++chan->ifstats.rx_dropped;
+ return;
+ }
+ skb->dev = dev;
+ skb->protocol = htons(chan->protocol);
+ chan->rx_skb = skb;
+ }
+
+ if (skb_tailroom(skb) < len)
+ {
+ /* No room for the packet. Call off the whole thing! */
+ dev_kfree_skb(skb);
+ chan->rx_skb = NULL;
+ if (qdm & 0x01) chan->drop_sequence = 1;
+
+ printk(KERN_INFO "%s: unexpectedly long packet sequence "
+ "on interface %s!\n", card->devname, dev->name);
+ ++chan->ifstats.rx_length_errors;
+ return;
+ }
+
+ /* Append packet to the socket buffer */
+ bufptr = skb_put(skb, len);
+ memcpy(bufptr, rxmb->data, len);
+
+ if (qdm & 0x01)
+ return; /* more data is comming */
+
+ dev->last_rx = jiffies; /* timestamp */
+ chan->rx_skb = NULL; /* dequeue packet */
+
+ /* Decapsulate packet, if necessary */
+ if (!skb->protocol && !wanrouter_type_trans(skb, dev))
+ {
+ /* can't decapsulate packet */
+ dev_kfree_skb(skb);
+ ++chan->ifstats.rx_errors;
+ }
+ else
+ {
+ if( handle_IPXWAN(skb->data, card->devname, card->wandev.enable_IPX, card->wandev.network_number, skb->protocol))
+ {
+ if( card->wandev.enable_IPX )
+ {
+ if(chan_send(dev, skb))
+ {
+ chan->tx_skb = skb;
+ }
+ else
+ {
+ dev_kfree_skb(skb);
+ }
+ }
+ else
+ {
+ /* FIXME: increment IPX packet dropped statistic */
+ }
+ }
+ else
+ {
+ netif_rx(skb);
+ ++chan->ifstats.rx_packets;
+ chan->ifstats.rx_bytes += skb->len;
+ }
+ }
+}
+
+/*============================================================================
+ * Transmit interrupt handler.
+ * o Release socket buffer
+ * o Clear 'tbusy' flag
+ */
+
+static void tx_intr (sdla_t* card)
+{
+ struct net_device *dev;
+
+ /* unbusy all devices and then dev_tint(); */
+ for(dev = card->wandev.dev; dev; dev = dev->slave)
+ {
+ ((x25_channel_t*)dev->priv)->devtint = dev->tbusy;
+ dev->tbusy = 0;
+ }
+
+}
+
+/*============================================================================
+ * Modem status interrupt handler.
+ */
+static void status_intr (sdla_t* card)
+{
+}
+
+/*============================================================================
+ * Network event interrupt handler.
+ */
+static void event_intr (sdla_t* card)
+{
+}
+
+/*============================================================================
+ * Spurious interrupt handler.
+ * o print a warning
+ * o
+ * If number of spurious interrupts exceeded some limit, then ???
+ */
+static void spur_intr (sdla_t* card)
+{
+ printk(KERN_INFO "%s: spurious interrupt!\n", card->devname);
+}
+
+/****** Background Polling Routines ****************************************/
+
+/*============================================================================
+ * Main polling routine.
+ * This routine is repeatedly called by the WANPIPE 'thread' to allow for
+ * time-dependent housekeeping work.
+ *
+ * Notes:
+ * 1. This routine may be called on interrupt context with all interrupts
+ * enabled. Beware!
+ */
+
+static void wpx_poll (sdla_t* card)
+{
+ unsigned long host_cpu_flags;
+
+ disable_irq(card->hw.irq);
+ ++card->irq_dis_poll_count;
+
+ if (test_and_set_bit(0, (void*)&card->wandev.critical))
+ {
+ printk(KERN_INFO "%s: critical in polling!\n",card->devname);
+ save_flags(host_cpu_flags);
+ cli();
+ if ((!card->irq_dis_if_send_count) &&
+ (!(--card->irq_dis_poll_count)))
+ enable_irq(card->hw.irq);
+ restore_flags(host_cpu_flags);
+ return;
+ }
+
+ switch(card->wandev.state)
+ {
+ case WAN_CONNECTED:
+ poll_active(card);
+ break;
+
+ case WAN_CONNECTING:
+ poll_connecting(card);
+ break;
+
+ case WAN_DISCONNECTED:
+ poll_disconnected(card);
+ }
+ card->wandev.critical = 0;
+ save_flags(host_cpu_flags);
+ cli();
+ if ((!card->irq_dis_if_send_count) && (!(--card->irq_dis_poll_count)))
+ enable_irq(card->hw.irq);
+ restore_flags(host_cpu_flags);
+}
+
+/*============================================================================
+ * Handle physical link establishment phase.
+ * o if connection timed out, disconnect the link.
+ */
+static void poll_connecting (sdla_t* card)
+{
+ TX25Status* status = card->flags;
+
+ if (status->gflags & X25_HDLC_ABM)
+ {
+ wanpipe_set_state(card, WAN_CONNECTED);
+ x25_set_intr_mode(card, 0x83); /* enable Rx interrupts */
+ status->imask &= ~0x2; /* mask Tx interupts */
+ }
+ else if ((jiffies - card->state_tick) > CONNECT_TIMEOUT)
+ disconnect(card);
+}
+
+/*============================================================================
+ * Handle physical link disconnected phase.
+ * o if hold-down timeout has expired and there are open interfaces, connect
+ * link.
+ */
+static void poll_disconnected (sdla_t* card)
+{
+ if (card->open_cnt && ((jiffies - card->state_tick) > HOLD_DOWN_TIME))
+ connect(card);
+}
+
+/*============================================================================
+ * Handle active link phase.
+ * o fetch X.25 asynchronous events.
+ * o kick off transmission on all interfaces.
+ */
+static void poll_active (sdla_t* card)
+{
+ struct net_device* dev;
+
+ /* Fetch X.25 asynchronous events */
+ x25_fetch_events(card);
+
+ for (dev = card->wandev.dev; dev; dev = dev->slave)
+ {
+ x25_channel_t* chan = dev->priv;
+ struct sk_buff* skb = chan->tx_skb;
+
+ /* If there is a packet queued for transmission then kick
+ * the channel's send routine. When transmission is complete
+ * or if error has occurred, release socket buffer and reset
+ * 'tbusy' flag.
+ */
+ if (skb && (chan_send(dev, skb) == 0))
+ {
+ chan->tx_skb = NULL;
+ dev->tbusy = 0;
+ dev_kfree_skb(skb);
+ }
+
+ /* If SVC has been idle long enough, close virtual circuit */
+
+ if(( chan->svc )&&( chan->state == WAN_CONNECTED ))
+ {
+ if( (jiffies - chan->i_timeout_sofar) / HZ > chan->idle_timeout )
+ {
+ /* Close svc */
+ printk(KERN_INFO "%s: Closing down Idle link %s on LCN %d\n",card->devname,chan->name,chan->lcn);
+ chan->i_timeout_sofar = jiffies;
+ chan_disc(dev);
+ }
+ }
+ }
+}
+
+/****** SDLA Firmware-Specific Functions *************************************
+ * Almost all X.25 commands can unexpetedly fail due to so called 'X.25
+ * asynchronous events' such as restart, interrupt, incoming call request,
+ * call clear request, etc. They can't be ignored and have to be dealt with
+ * immediately. To tackle with this problem we execute each interface command
+ * in a loop until good return code is received or maximum number of retries
+ * is reached. Each interface command returns non-zero return code, an
+ * asynchronous event/error handler x25_error() is called.
+ */
+
+/*============================================================================
+ * Read X.25 firmware version.
+ * Put code version as ASCII string in str.
+ */
+static int x25_get_version (sdla_t* card, char* str)
+{
+ TX25Mbox* mbox = card->mbox;
+ int retry = MAX_CMD_RETRY;
+ int err;
+
+ do
+ {
+ memset(&mbox->cmd, 0, sizeof(TX25Cmd));
+ mbox->cmd.command = X25_READ_CODE_VERSION;
+ err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
+ } while (err && retry-- &&
+ x25_error(card, err, X25_READ_CODE_VERSION, 0));
+
+ if (!err && str)
+ {
+ int len = mbox->cmd.length;
+ memcpy(str, mbox->data, len);
+ str[len] = '\0';
+ }
+ return err;
+}
+
+/*============================================================================
+ * Configure adapter.
+ */
+
+static int x25_configure (sdla_t* card, TX25Config* conf)
+{
+ TX25Mbox* mbox = card->mbox;
+ int retry = MAX_CMD_RETRY;
+ int err;
+
+ do
+ {
+ memset(&mbox->cmd, 0, sizeof(TX25Cmd));
+ memcpy(mbox->data, (void*)conf, sizeof(TX25Config));
+ mbox->cmd.length = sizeof(TX25Config);
+ mbox->cmd.command = X25_SET_CONFIGURATION;
+ err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
+ } while (err && retry-- && x25_error(card, err, X25_SET_CONFIGURATION, 0));
+ return err;
+}
+
+/*============================================================================
+ * Get communications error statistics.
+ */
+static int x25_get_err_stats (sdla_t* card)
+{
+ TX25Mbox* mbox = card->mbox;
+ int retry = MAX_CMD_RETRY;
+ int err;
+
+ do
+ {
+ memset(&mbox->cmd, 0, sizeof(TX25Cmd));
+ mbox->cmd.command = X25_HDLC_READ_COMM_ERR;
+ err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
+ } while (err && retry-- && x25_error(card, err, X25_HDLC_READ_COMM_ERR, 0));
+
+ if (!err)
+ {
+ THdlcCommErr* stats = (void*)mbox->data;
+
+ card->wandev.stats.rx_over_errors = stats->rxOverrun;
+ card->wandev.stats.rx_crc_errors = stats->rxBadCrc;
+ card->wandev.stats.rx_missed_errors = stats->rxAborted;
+ card->wandev.stats.tx_aborted_errors = stats->txAborted;
+ }
+ return err;
+}
+
+/*============================================================================
+ * Get protocol statistics.
+ */
+static int x25_get_stats (sdla_t* card)
+{
+ TX25Mbox* mbox = card->mbox;
+ int retry = MAX_CMD_RETRY;
+ int err;
+
+ do
+ {
+ memset(&mbox->cmd, 0, sizeof(TX25Cmd));
+ mbox->cmd.command = X25_READ_STATISTICS;
+ err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
+ } while (err && retry-- && x25_error(card, err, X25_READ_STATISTICS, 0));
+
+ if (!err)
+ {
+ TX25Stats* stats = (void*)mbox->data;
+
+ card->wandev.stats.rx_packets = stats->rxData;
+ card->wandev.stats.tx_packets = stats->rxData;
+ }
+ return err;
+}
+
+/*============================================================================
+ * Close HDLC link.
+ */
+static int x25_close_hdlc (sdla_t* card)
+{
+ TX25Mbox* mbox = card->mbox;
+ int retry = MAX_CMD_RETRY;
+ int err;
+
+ do
+ {
+ memset(&mbox->cmd, 0, sizeof(TX25Cmd));
+ mbox->cmd.command = X25_HDLC_LINK_CLOSE;
+ err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
+ } while (err && retry-- && x25_error(card, err, X25_HDLC_LINK_CLOSE, 0));
+
+ return err;
+}
+
+/*============================================================================
+ * Open HDLC link.
+ */
+static int x25_open_hdlc (sdla_t* card)
+{
+ TX25Mbox* mbox = card->mbox;
+ int retry = MAX_CMD_RETRY;
+ int err;
+
+ do
+ {
+ memset(&mbox->cmd, 0, sizeof(TX25Cmd));
+ mbox->cmd.command = X25_HDLC_LINK_OPEN;
+ err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
+ } while (err && retry-- && x25_error(card, err, X25_HDLC_LINK_OPEN, 0));
+
+ return err;
+}
+
+/*============================================================================
+ * Setup HDLC link.
+ */
+static int x25_setup_hdlc (sdla_t* card)
+{
+ TX25Mbox* mbox = card->mbox;
+ int retry = MAX_CMD_RETRY;
+ int err;
+
+ do
+ {
+ memset(&mbox->cmd, 0, sizeof(TX25Cmd));
+ mbox->cmd.command = X25_HDLC_LINK_SETUP;
+ err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
+ } while (err && retry-- && x25_error(card, err, X25_HDLC_LINK_SETUP, 0));
+
+ return err;
+}
+
+/*============================================================================
+ * Set (raise/drop) DTR.
+ */
+static int x25_set_dtr (sdla_t* card, int dtr)
+{
+ TX25Mbox* mbox = card->mbox;
+ int retry = MAX_CMD_RETRY;
+ int err;
+
+ do
+ {
+ memset(&mbox->cmd, 0, sizeof(TX25Cmd));
+ mbox->data[0] = 0;
+ mbox->data[2] = 0;
+ mbox->data[1] = dtr ? 0x02 : 0x01;
+ mbox->cmd.length = 3;
+ mbox->cmd.command = X25_SET_GLOBAL_VARS;
+ err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
+ } while (err && retry-- && x25_error(card, err, X25_SET_GLOBAL_VARS, 0));
+
+ return err;
+}
+
+/*============================================================================
+ * Set interrupt mode.
+ */
+static int x25_set_intr_mode (sdla_t* card, int mode)
+{
+ TX25Mbox* mbox = card->mbox;
+ int retry = MAX_CMD_RETRY;
+ int err;
+
+ do
+ {
+ memset(&mbox->cmd, 0, sizeof(TX25Cmd));
+ mbox->data[0] = mode;
+ if (card->hw.fwid == SFID_X25_508)
+ {
+ mbox->data[1] = card->hw.irq;
+ mbox->cmd.length = 2;
+ }
+ else mbox->cmd.length = 1;
+ mbox->cmd.command = X25_SET_INTERRUPT_MODE;
+ err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
+ } while (err && retry-- && x25_error(card, err, X25_SET_INTERRUPT_MODE, 0)) ;
+ return err;
+}
+
+/*============================================================================
+ * Read X.25 channel configuration.
+ */
+static int x25_get_chan_conf (sdla_t* card, x25_channel_t* chan)
+{
+ TX25Mbox* mbox = card->mbox;
+ int retry = MAX_CMD_RETRY;
+ int lcn = chan->lcn;
+ int err;
+
+ do
+ {
+ memset(&mbox->cmd, 0, sizeof(TX25Cmd));
+ mbox->cmd.lcn = lcn;
+ mbox->cmd.command = X25_READ_CHANNEL_CONFIG;
+ err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
+ } while (err && retry-- && x25_error(card, err, X25_READ_CHANNEL_CONFIG, lcn));
+
+ if (!err)
+ {
+ TX25Status* status = card->flags;
+
+ /* calculate an offset into the array of status bytes */
+ if (card->u.x.hi_svc <= 255)
+ chan->ch_idx = lcn - 1;
+ else
+ {
+ int offset;
+
+ switch (mbox->data[0] && 0x1F)
+ {
+ case 0x01:
+ offset = status->pvc_map; break;
+ case 0x03:
+ offset = status->icc_map; break;
+ case 0x07:
+ offset = status->twc_map; break;
+ case 0x0B:
+ offset = status->ogc_map; break;
+ default:
+ offset = 0;
+ }
+ chan->ch_idx = lcn - 1 - offset;
+ }
+
+ /* get actual transmit packet size on this channel */
+ switch(mbox->data[1] & 0x38)
+ {
+ case 0x00:
+ chan->tx_pkt_size = 16;
+ break;
+ case 0x08:
+ chan->tx_pkt_size = 32;
+ break;
+ case 0x10:
+ chan->tx_pkt_size = 64;
+ break;
+ case 0x18:
+ chan->tx_pkt_size = 128;
+ break;
+ case 0x20:
+ chan->tx_pkt_size = 256;
+ break;
+ case 0x28:
+ chan->tx_pkt_size = 512;
+ break;
+ case 0x30:
+ chan->tx_pkt_size = 1024;
+ break;
+ }
+ printk(KERN_INFO "%s: X.25 packet size on LCN %d is %d.\n",
+ card->devname, lcn, chan->tx_pkt_size);
+ }
+ return err;
+}
+
+/*============================================================================
+ * Place X.25 call.
+ */
+
+static int x25_place_call (sdla_t* card, x25_channel_t* chan)
+{
+ TX25Mbox* mbox = card->mbox;
+ int retry = MAX_CMD_RETRY;
+ int err;
+ char str[64];
+
+ sprintf(str, "-d%s -uCC", chan->addr);
+ do
+ {
+ memset(&mbox->cmd, 0, sizeof(TX25Cmd));
+ strcpy(mbox->data, str);
+ mbox->cmd.length = strlen(str);
+ mbox->cmd.command = X25_PLACE_CALL;
+ err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
+ } while (err && retry-- && x25_error(card, err, X25_PLACE_CALL, 0));
+
+ if (!err)
+ {
+ chan->lcn = mbox->cmd.lcn;
+ chan->protocol = ETH_P_IP;
+ }
+ return err;
+}
+
+/*============================================================================
+ * Accept X.25 call.
+ */
+
+static int x25_accept_call (sdla_t* card, int lcn, int qdm)
+{
+ TX25Mbox* mbox = card->mbox;
+ int retry = MAX_CMD_RETRY;
+ int err;
+
+ do
+ {
+ memset(&mbox->cmd, 0, sizeof(TX25Cmd));
+ mbox->cmd.lcn = lcn;
+ mbox->cmd.qdm = qdm;
+ mbox->cmd.command = X25_ACCEPT_CALL;
+ err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
+ } while (err && retry-- && x25_error(card, err, X25_ACCEPT_CALL, lcn));
+
+ return err;
+}
+
+/*============================================================================
+ * Clear X.25 call.
+ */
+static int x25_clear_call (sdla_t* card, int lcn, int cause, int diagn)
+{
+ TX25Mbox* mbox = card->mbox;
+ int retry = MAX_CMD_RETRY;
+ int err;
+
+ do
+ {
+ memset(&mbox->cmd, 0, sizeof(TX25Cmd));
+ mbox->cmd.lcn = lcn;
+ mbox->cmd.cause = cause;
+ mbox->cmd.diagn = diagn;
+ mbox->cmd.command = X25_CLEAR_CALL;
+ err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
+ } while (err && retry-- && x25_error(card, err, X25_CLEAR_CALL, lcn));
+
+ return err;
+}
+
+/*============================================================================
+ * Send X.25 data packet.
+ */
+static int x25_send (sdla_t* card, int lcn, int qdm, int len, void* buf)
+{
+ TX25Mbox* mbox = card->mbox;
+ int retry = MAX_CMD_RETRY;
+ int err;
+
+ do
+ {
+ memset(&mbox->cmd, 0, sizeof(TX25Cmd));
+ memcpy(mbox->data, buf, len);
+ mbox->cmd.length = len;
+ mbox->cmd.lcn = lcn;
+ mbox->cmd.qdm = qdm;
+ mbox->cmd.command = X25_WRITE;
+ err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
+ } while (err && retry-- && x25_error(card, err, X25_WRITE, lcn));
+ return err;
+}
+
+/*============================================================================
+ * Fetch X.25 asynchronous events.
+ */
+static int x25_fetch_events (sdla_t* card)
+{
+ TX25Status* status = card->flags;
+ TX25Mbox* mbox = card->mbox;
+ int err = 0;
+
+ if (status->gflags & 0x20)
+ {
+ memset(&mbox->cmd, 0, sizeof(TX25Cmd));
+ mbox->cmd.command = X25_IS_DATA_AVAILABLE;
+ err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
+ if (err)
+ x25_error(card, err, X25_IS_DATA_AVAILABLE, 0);
+ }
+ return err;
+}
+
+/*============================================================================
+ * X.25 asynchronous event/error handler.
+ * This routine is called each time interface command returns non-zero
+ * return code to handle X.25 asynchronous events and common errors.
+ * Return non-zero to repeat command or zero to cancel it.
+ *
+ * Notes:
+ * 1. This function may be called recursively, as handling some of the
+ * asynchronous events (e.g. call request) requires execution of the
+ * interface command(s) that, in turn, may also return asynchronous
+ * events. To avoid re-entrancy problems we copy mailbox to dynamically
+ * allocated memory before processing events.
+ */
+static int x25_error (sdla_t* card, int err, int cmd, int lcn)
+{
+ int retry = 1;
+ unsigned dlen = ((TX25Mbox*)card->mbox)->cmd.length;
+ TX25Mbox* mb;
+
+ mb = kmalloc(sizeof(TX25Mbox) + dlen, GFP_ATOMIC);
+ if (mb == NULL)
+ {
+ printk(KERN_ERR "%s: x25_error() out of memory!\n",
+ card->devname);
+ return 0;
+ }
+ memcpy(mb, card->mbox, sizeof(TX25Mbox) + dlen);
+ switch (err)
+ {
+ case 0x40: /* X.25 asynchronous packet was received */
+ mb->data[dlen] = '\0';
+ switch (mb->cmd.pktType & 0x7F)
+ {
+ case 0x30: /* incoming call */
+ retry = incoming_call(card, cmd, lcn, mb);
+ break;
+
+ case 0x31: /* connected */
+ retry = call_accepted(card, cmd, lcn, mb);
+ break;
+
+ case 0x02: /* call clear request */
+ retry = call_cleared(card, cmd, lcn, mb);
+ break;
+
+ case 0x04: /* reset request */
+ printk(KERN_INFO "%s: X.25 reset request on LCN %d! "
+ "Cause:0x%02X Diagn:0x%02X\n",
+ card->devname, mb->cmd.lcn, mb->cmd.cause,
+ mb->cmd.diagn);
+ break;
+
+ case 0x08: /* restart request */
+ retry = restart_event(card, cmd, lcn, mb);
+ break;
+
+ default:
+ printk(KERN_INFO "%s: X.25 event 0x%02X on LCN %d! "
+ "Cause:0x%02X Diagn:0x%02X\n",
+ card->devname, mb->cmd.pktType,
+ mb->cmd.lcn, mb->cmd.cause, mb->cmd.diagn);
+ }
+ break;
+
+ case 0x41: /* X.25 protocol violation indication */
+ printk(KERN_INFO
+ "%s: X.25 protocol violation on LCN %d! "
+ "Packet:0x%02X Cause:0x%02X Diagn:0x%02X\n",
+ card->devname, mb->cmd.lcn,
+ mb->cmd.pktType & 0x7F, mb->cmd.cause, mb->cmd.diagn);
+ break;
+
+ case 0x42: /* X.25 timeout */
+ retry = timeout_event(card, cmd, lcn, mb);
+ break;
+
+ case 0x43: /* X.25 retry limit exceeded */
+ printk(KERN_INFO
+ "%s: exceeded X.25 retry limit on LCN %d! "
+ "Packet:0x%02X Diagn:0x%02X\n", card->devname,
+ mb->cmd.lcn, mb->cmd.pktType, mb->cmd.diagn);
+ break;
+
+ case 0x08: /* modem failure */
+ printk(KERN_INFO "%s: modem failure!\n", card->devname);
+ break;
+
+ case 0x09: /* N2 retry limit */
+ printk(KERN_INFO "%s: exceeded HDLC retry limit!\n",
+ card->devname);
+ break;
+
+ case 0x06: /* unnumbered frame was received while in ABM */
+ printk(KERN_INFO "%s: received Unnumbered frame 0x%02X!\n",
+ card->devname, mb->data[0]);
+ break;
+
+ case CMD_TIMEOUT:
+ printk(KERN_ERR "%s: command 0x%02X timed out!\n",
+ card->devname, cmd);
+ retry = 0; /* abort command */
+ break;
+
+ default:
+ printk(KERN_INFO "%s: command 0x%02X returned 0x%02X!\n",
+ card->devname, cmd, err);
+ retry = 0; /* abort command */
+ }
+ kfree(mb);
+ return retry;
+}
+
+/****** X.25 Asynchronous Event Handlers *************************************
+ * These functions are called by the x25_error() and should return 0, if
+ * the command resulting in the asynchronous event must be aborted.
+ */
+
+/*============================================================================
+ * Handle X.25 incoming call request.
+ * RFC 1356 establishes the following rules:
+ * 1. The first octet in the Call User Data (CUD) field of the call
+ * request packet contains NLPID identifying protocol encapsulation.
+ * 2. Calls MUST NOT be accepted unless router supports requested
+ * protocol encapsulation.
+ * 3. A diagnostic code 249 defined by ISO/IEC 8208 may be used when
+ * clearing a call because protocol encapsulation is not supported.
+ * 4. If an incoming call is received while a call request is pending
+ * (i.e. call collision has occurred), the incoming call shall be
+ * rejected and call request shall be retried.
+ */
+
+static int incoming_call (sdla_t* card, int cmd, int lcn, TX25Mbox* mb)
+{
+ wan_device_t* wandev = &card->wandev;
+ int new_lcn = mb->cmd.lcn;
+ struct net_device* dev = get_dev_by_lcn(wandev, new_lcn);
+ x25_channel_t* chan = NULL;
+ int accept = 0; /* set to '1' if o.k. to accept call */
+ x25_call_info_t* info;
+
+ /* Make sure there is no call collision */
+ if (dev != NULL)
+ {
+ printk(KERN_INFO
+ "%s: X.25 incoming call collision on LCN %d!\n",
+ card->devname, new_lcn);
+ x25_clear_call(card, new_lcn, 0, 0);
+ return 1;
+ }
+
+ /* Make sure D bit is not set in call request */
+ if (mb->cmd.qdm & 0x02)
+ {
+ printk(KERN_INFO
+ "%s: X.25 incoming call on LCN %d with D-bit set!\n",
+ card->devname, new_lcn);
+ x25_clear_call(card, new_lcn, 0, 0);
+ return 1;
+ }
+
+ /* Parse call request data */
+ info = kmalloc(sizeof(x25_call_info_t), GFP_ATOMIC);
+ if (info == NULL)
+ {
+ printk(KERN_ERR
+ "%s: not enough memory to parse X.25 incoming call "
+ "on LCN %d!\n", card->devname, new_lcn);
+ x25_clear_call(card, new_lcn, 0, 0);
+ return 1;
+ }
+ parse_call_info(mb->data, info);
+ printk(KERN_INFO "%s: X.25 incoming call on LCN %d! Call data: %s\n",
+ card->devname, new_lcn, mb->data);
+
+ /* Find available channel */
+ for (dev = wandev->dev; dev; dev = dev->slave)
+ {
+ chan = dev->priv;
+
+ if (!chan->svc || (chan->state != WAN_DISCONNECTED))
+ continue;
+ if (strcmp(info->src, chan->addr) == 0)
+ break;
+ /* If just an '@' is specified, accept all incoming calls */
+ if (strcmp(chan->addr, "") == 0)
+ break;
+ }
+
+ if (dev == NULL)
+ {
+ printk(KERN_INFO "%s: no channels available!\n",
+ card->devname);
+ x25_clear_call(card, new_lcn, 0, 0);
+ }
+
+ /* Check requested protocol encapsulation */
+ else if (info->nuser == 0)
+ {
+ printk(KERN_INFO
+ "%s: no user data in incoming call on LCN %d!\n",
+ card->devname, new_lcn);
+ x25_clear_call(card, new_lcn, 0, 0);
+ }
+ else switch (info->user[0])
+ {
+ case 0: /* multiplexed */
+ chan->protocol = 0;
+ accept = 1;
+ break;
+
+ case NLPID_IP: /* IP datagrams */
+ chan->protocol = ETH_P_IP;
+ accept = 1;
+ break;
+
+ case NLPID_SNAP: /* IPX datagrams */
+ chan->protocol = ETH_P_IPX;
+ accept = 1;
+ break;
+ default:
+ printk(KERN_INFO
+ "%s: unsupported NLPID 0x%02X in incoming call "
+ "on LCN %d!\n", card->devname, info->user[0], new_lcn);
+ x25_clear_call(card, new_lcn, 0, 249);
+ }
+
+ if (accept && (x25_accept_call(card, new_lcn, 0) == CMD_OK))
+ {
+ chan->lcn = new_lcn;
+ if (x25_get_chan_conf(card, chan) == CMD_OK)
+ set_chan_state(dev, WAN_CONNECTED);
+ else
+ x25_clear_call(card, new_lcn, 0, 0);
+ }
+ kfree(info);
+ return 1;
+}
+
+/*============================================================================
+ * Handle accepted call.
+ */
+
+static int call_accepted (sdla_t* card, int cmd, int lcn, TX25Mbox* mb)
+{
+ unsigned new_lcn = mb->cmd.lcn;
+ struct net_device* dev = get_dev_by_lcn(&card->wandev, new_lcn);
+ x25_channel_t* chan;
+
+ printk(KERN_INFO "%s: X.25 call accepted on LCN %d!\n",
+ card->devname, new_lcn);
+ if (dev == NULL)
+ {
+ printk(KERN_INFO
+ "%s: clearing orphaned connection on LCN %d!\n",
+ card->devname, new_lcn);
+ x25_clear_call(card, new_lcn, 0, 0);
+ return 1;
+ }
+
+ /* Get channel configuration and notify router */
+ chan = dev->priv;
+ if (x25_get_chan_conf(card, chan) != CMD_OK)
+ {
+ x25_clear_call(card, new_lcn, 0, 0);
+ return 1;
+ }
+ set_chan_state(dev, WAN_CONNECTED);
+ return 1;
+}
+
+/*============================================================================
+ * Handle cleared call.
+ */
+
+static int call_cleared (sdla_t* card, int cmd, int lcn, TX25Mbox* mb)
+{
+ unsigned new_lcn = mb->cmd.lcn;
+ struct net_device* dev = get_dev_by_lcn(&card->wandev, new_lcn);
+
+ printk(KERN_INFO "%s: X.25 clear request on LCN %d! Cause:0x%02X "
+ "Diagn:0x%02X\n",
+ card->devname, new_lcn, mb->cmd.cause, mb->cmd.diagn);
+ if (dev == NULL)
+ return 1;
+ set_chan_state(dev, WAN_DISCONNECTED);
+ return ((cmd == X25_WRITE) && (lcn == new_lcn)) ? 0 : 1;
+}
+
+/*============================================================================
+ * Handle X.25 restart event.
+ */
+
+static int restart_event (sdla_t* card, int cmd, int lcn, TX25Mbox* mb)
+{
+ wan_device_t* wandev = &card->wandev;
+ struct net_device* dev;
+
+ printk(KERN_INFO
+ "%s: X.25 restart request! Cause:0x%02X Diagn:0x%02X\n",
+ card->devname, mb->cmd.cause, mb->cmd.diagn);
+
+ /* down all logical channels */
+ for (dev = wandev->dev; dev; dev = dev->slave)
+ set_chan_state(dev, WAN_DISCONNECTED);
+ return (cmd == X25_WRITE) ? 0 : 1;
+}
+
+/*============================================================================
+ * Handle timeout event.
+ */
+static int timeout_event (sdla_t* card, int cmd, int lcn, TX25Mbox* mb)
+{
+ unsigned new_lcn = mb->cmd.lcn;
+
+ if (mb->cmd.pktType == 0x05) /* call request time out */
+ {
+ struct net_device* dev = get_dev_by_lcn(&card->wandev, new_lcn);
+
+ printk(KERN_INFO "%s: X.25 call timed timeout on LCN %d!\n",
+ card->devname, new_lcn);
+ if (dev)
+ set_chan_state(dev, WAN_DISCONNECTED);
+ }
+ else printk(KERN_INFO "%s: X.25 packet 0x%02X timeout on LCN %d!\n",
+ card->devname, mb->cmd.pktType, new_lcn);
+ return 1;
+}
+
+/******* Miscellaneous ******************************************************/
+
+/*============================================================================
+ * Establish physical connection.
+ * o open HDLC and raise DTR
+ *
+ * Return: 0 connection established
+ * 1 connection is in progress
+ * <0 error
+ */
+static int connect (sdla_t* card)
+{
+ if (x25_open_hdlc(card) || x25_setup_hdlc(card))
+ return -EIO;
+ wanpipe_set_state(card, WAN_CONNECTING);
+ return 1;
+}
+
+/*============================================================================
+ * Tear down physical connection.
+ * o close HDLC link
+ * o drop DTR
+ *
+ * Return: 0
+ * <0 error
+ */
+static int disconnect (sdla_t* card)
+{
+ wanpipe_set_state(card, WAN_DISCONNECTED);
+ x25_set_intr_mode(card, 0); /* disable interrupt generation */
+ x25_close_hdlc(card); /* close HDLC link */
+ x25_set_dtr(card, 0); /* drop DTR */
+ return 0;
+}
+
+/*============================================================================
+ * Find network device by its channel number.
+ */
+static struct net_device* get_dev_by_lcn (wan_device_t* wandev, unsigned lcn)
+{
+ struct net_device* dev;
+
+ for (dev = wandev->dev; dev; dev = dev->slave)
+ if (((x25_channel_t*)dev->priv)->lcn == lcn)
+ break;
+ return dev;
+}
+
+/*============================================================================
+ * Initiate connection on the logical channel.
+ * o for PVC we just get channel configuration
+ * o for SVCs place an X.25 call
+ *
+ * Return: 0 connected
+ * >0 connection in progress
+ * <0 failure
+ */
+static int chan_connect (struct net_device* dev)
+{
+ x25_channel_t* chan = dev->priv;
+ sdla_t* card = chan->card;
+
+ if (chan->svc)
+ {
+ if (!chan->addr[0])
+ return -EINVAL; /* no destination address */
+ printk(KERN_INFO "%s: placing X.25 call to %s ...\n",
+ card->devname, chan->addr);
+ if (x25_place_call(card, chan) != CMD_OK)
+ return -EIO;
+ set_chan_state(dev, WAN_CONNECTING);
+ return 1;
+ }
+ else
+ {
+ if (x25_get_chan_conf(card, chan) != CMD_OK)
+ return -EIO;
+ set_chan_state(dev, WAN_CONNECTED);
+ }
+ return 0;
+}
+
+/*============================================================================
+ * Disconnect logical channel.
+ * o if SVC then clear X.25 call
+ */
+static int chan_disc (struct net_device* dev)
+{
+ x25_channel_t* chan = dev->priv;
+
+ if (chan->svc)
+ x25_clear_call(chan->card, chan->lcn, 0, 0);
+ set_chan_state(dev, WAN_DISCONNECTED);
+ return 0;
+}
+
+/*============================================================================
+ * Set logical channel state.
+ */
+static void set_chan_state (struct net_device* dev, int state)
+{
+ x25_channel_t* chan = dev->priv;
+ sdla_t* card = chan->card;
+ unsigned long flags;
+
+ save_flags(flags);
+ cli();
+ if (chan->state != state)
+ {
+ switch (state)
+ {
+ case WAN_CONNECTED:
+ printk (KERN_INFO "%s: interface %s connected!\n",
+ card->devname, dev->name);
+ *(unsigned short*)dev->dev_addr = htons(chan->lcn);
+ chan->i_timeout_sofar = jiffies;
+ break;
+
+ case WAN_CONNECTING:
+ printk (KERN_INFO "%s: interface %s connecting...\n",
+ card->devname, dev->name);
+ break;
+
+ case WAN_DISCONNECTED:
+ printk (KERN_INFO "%s: interface %s disconnected!\n",
+ card->devname, dev->name);
+ if (chan->svc)
+ {
+ *(unsigned short*)dev->dev_addr = 0;
+ chan->lcn = 0;
+ }
+ break;
+ }
+ chan->state = state;
+ }
+ chan->state_tick = jiffies;
+ restore_flags(flags);
+}
+
+/*============================================================================
+ * Send packet on a logical channel.
+ * When this function is called, tx_skb field of the channel data space
+ * points to the transmit socket buffer. When transmission is complete,
+ * release socket buffer and reset 'tbusy' flag.
+ *
+ * Return: 0 - transmission complete
+ * 1 - busy
+ *
+ * Notes:
+ * 1. If packet length is greater than MTU for this channel, we'll fragment
+ * the packet into 'complete sequence' using M-bit.
+ * 2. When transmission is complete, an event notification should be issued
+ * to the router.
+ */
+static int chan_send (struct net_device* dev, struct sk_buff* skb)
+{
+ x25_channel_t* chan = dev->priv;
+ sdla_t* card = chan->card;
+ TX25Status* status = card->flags;
+ unsigned len, qdm;
+
+ /* Check to see if channel is ready */
+ if (!(status->cflags[chan->ch_idx] & 0x40))
+ return 1;
+
+ if (skb->len > chan->tx_pkt_size)
+ {
+ len = chan->tx_pkt_size;
+ qdm = 0x01; /* set M-bit (more data) */
+ }
+ else /* final packet */
+ {
+ len = skb->len;
+ qdm = 0;
+ }
+ switch(x25_send(card, chan->lcn, qdm, len, skb->data))
+ {
+ case 0x00: /* success */
+ chan->i_timeout_sofar = jiffies;
+ if (qdm)
+ {
+ skb_pull(skb, len);
+ return 1;
+ }
+ ++chan->ifstats.tx_packets;
+ chan->ifstats.tx_bytes += skb->len;
+ break;
+
+ case 0x33: /* Tx busy */
+ return 1;
+
+ default: /* failure */
+ ++chan->ifstats.tx_errors;
+/* return 1; */
+ }
+ return 0;
+}
+
+/*============================================================================
+ * Parse X.25 call request data and fill x25_call_info_t structure.
+ */
+
+static void parse_call_info (unsigned char* str, x25_call_info_t* info)
+{
+ memset(info, 0, sizeof(x25_call_info_t));
+ for (; *str; ++str)
+ {
+ int i;
+ unsigned ch;
+
+ if (*str == '-') switch (str[1])
+ {
+ case 'd': /* destination address */
+ for (i = 0; i < 16; ++i)
+ {
+ ch = str[2+i];
+ if (!is_digit(ch))
+ break;
+ info->dest[i] = ch;
+ }
+ break;
+
+ case 's': /* source address */
+ for (i = 0; i < 16; ++i)
+ {
+ ch = str[2+i];
+ if (!is_digit(ch))
+ break;
+ info->src[i] = ch;
+ }
+ break;
+
+ case 'u': /* user data */
+ for (i = 0; i < 127; ++i)
+ {
+ ch = str[2+2*i];
+ if (!is_hex_digit(ch))
+ break;
+ info->user[i] = hex_to_uint(&str[2+2*i], 2);
+ }
+ info->nuser = i;
+ break;
+
+ case 'f': /* facilities */
+ for (i = 0; i < 64; ++i)
+ {
+ ch = str[2+4*i];
+ if (!is_hex_digit(ch))
+ break;
+ info->facil[i].code =
+ hex_to_uint(&str[2+4*i], 2);
+ ch = str[4+4*i];
+ if (!is_hex_digit(ch))
+ break;
+ info->facil[i].parm =
+ hex_to_uint(&str[4+4*i], 2);
+ }
+ info->nfacil = i;
+ break;
+ }
+ }
+}
+
+/*============================================================================
+ * Convert line speed in bps to a number used by S502 code.
+ */
+static unsigned char bps_to_speed_code (unsigned long bps)
+{
+ unsigned char number;
+
+ if (bps <= 1200) number = 0x01 ;
+ else if (bps <= 2400) number = 0x02;
+ else if (bps <= 4800) number = 0x03;
+ else if (bps <= 9600) number = 0x04;
+ else if (bps <= 19200) number = 0x05;
+ else if (bps <= 38400) number = 0x06;
+ else if (bps <= 45000) number = 0x07;
+ else if (bps <= 56000) number = 0x08;
+ else if (bps <= 64000) number = 0x09;
+ else if (bps <= 74000) number = 0x0A;
+ else if (bps <= 112000) number = 0x0B;
+ else if (bps <= 128000) number = 0x0C;
+ else number = 0x0D;
+
+ return number;
+}
+
+/*============================================================================
+ * Convert decimal string to unsigned integer.
+ * If len != 0 then only 'len' characters of the string are converted.
+ */
+static unsigned int dec_to_uint (unsigned char* str, int len)
+{
+ unsigned val;
+
+ if (!len) len = strlen(str);
+ for (val = 0; len && is_digit(*str); ++str, --len)
+ val = (val * 10) + (*str - (unsigned)'0');
+ return val;
+}
+
+/*============================================================================
+ * Convert hex string to unsigned integer.
+ * If len != 0 then only 'len' characters of the string are conferted.
+ */
+static unsigned int hex_to_uint (unsigned char* str, int len)
+{
+ unsigned val, ch;
+
+ if (!len) len = strlen(str);
+ for (val = 0; len; ++str, --len)
+ {
+ ch = *str;
+ if (is_digit(ch))
+ val = (val << 4) + (ch - (unsigned)'0');
+ else if (is_hex_digit(ch))
+ val = (val << 4) + ((ch & 0xDF) - (unsigned)'A' + 10);
+ else
+ break;
+ }
+ return val;
+}
+
+
+static int handle_IPXWAN(unsigned char *sendpacket, char *devname, unsigned char enable_IPX, unsigned long network_number, unsigned short proto)
+{
+ int i;
+
+ if( proto == htons(ETH_P_IPX) ) {
+ /* It's an IPX packet */
+ if(!enable_IPX) {
+ /* Return 1 so we don't pass it up the stack. */
+ return 1;
+ }
+ } else {
+ /* It's not IPX so pass it up the stack. */
+ return 0;
+ }
+
+ if( sendpacket[16] == 0x90 &&
+ sendpacket[17] == 0x04)
+ {
+ /* It's IPXWAN */
+
+ if( sendpacket[2] == 0x02 &&
+ sendpacket[34] == 0x00)
+ {
+ /* It's a timer request packet */
+ printk(KERN_INFO "%s: Received IPXWAN Timer Request packet\n",devname);
+
+ /* Go through the routing options and answer no to every
+ * option except Unnumbered RIP/SAP */
+ for(i = 41; sendpacket[i] == 0x00; i += 5)
+ {
+ /* 0x02 is the option for Unnumbered RIP/SAP */
+ if( sendpacket[i + 4] != 0x02)
+ sendpacket[i + 1] = 0;
+ }
+
+ /* Skip over the extended Node ID option */
+ if( sendpacket[i] == 0x04 )
+ i += 8;
+
+ /* We also want to turn off all header compression opt. */
+ for(; sendpacket[i] == 0x80 ;)
+ {
+ sendpacket[i + 1] = 0;
+ i += (sendpacket[i + 2] << 8) + (sendpacket[i + 3]) + 4;
+ }
+
+ /* Set the packet type to timer response */
+ sendpacket[34] = 0x01;
+
+ printk(KERN_INFO "%s: Sending IPXWAN Timer Response\n",devname);
+ }
+ else if( sendpacket[34] == 0x02 )
+ {
+ /* This is an information request packet */
+ printk(KERN_INFO "%s: Received IPXWAN Information Request packet\n",devname);
+
+ /* Set the packet type to information response */
+ sendpacket[34] = 0x03;
+
+ /* Set the router name */
+ sendpacket[51] = 'X';
+ sendpacket[52] = 'T';
+ sendpacket[53] = 'P';
+ sendpacket[54] = 'I';
+ sendpacket[55] = 'P';
+ sendpacket[56] = 'E';
+ sendpacket[57] = '-';
+ sendpacket[58] = CVHexToAscii(network_number >> 28);
+ sendpacket[59] = CVHexToAscii((network_number & 0x0F000000)>> 24);
+ sendpacket[60] = CVHexToAscii((network_number & 0x00F00000)>> 20);
+ sendpacket[61] = CVHexToAscii((network_number & 0x000F0000)>> 16);
+ sendpacket[62] = CVHexToAscii((network_number & 0x0000F000)>> 12);
+ sendpacket[63] = CVHexToAscii((network_number & 0x00000F00)>> 8);
+ sendpacket[64] = CVHexToAscii((network_number & 0x000000F0)>> 4);
+ sendpacket[65] = CVHexToAscii(network_number & 0x0000000F);
+ for(i = 66; i < 99; i+= 1)
+ sendpacket[i] = 0;
+
+ printk(KERN_INFO "%s: Sending IPXWAN Information Response packet\n",devname);
+ }
+ else
+ {
+ printk(KERN_INFO "%s: Unknown IPXWAN packet!\n",devname);
+ return 0;
+ }
+
+ /* Set the WNodeID to our network address */
+ sendpacket[35] = (unsigned char)(network_number >> 24);
+ sendpacket[36] = (unsigned char)((network_number & 0x00FF0000) >> 16);
+ sendpacket[37] = (unsigned char)((network_number & 0x0000FF00) >> 8);
+ sendpacket[38] = (unsigned char)(network_number & 0x000000FF);
+
+ return 1;
+ } else {
+ /* If we get here its an IPX-data packet, so it'll get passed up the stack.
+ switch the network numbers */
+ switch_net_numbers(sendpacket, network_number, 1);
+ return 0;
+ }
+}
+
+/*
+ If incoming is 0 (outgoing)- if the net numbers is ours make it 0
+ if incoming is 1 - if the net number is 0 make it ours
+
+*/
+
+static void switch_net_numbers(unsigned char *sendpacket, unsigned long network_number, unsigned char incoming)
+{
+ unsigned long pnetwork_number;
+
+ pnetwork_number = (unsigned long)((sendpacket[6] << 24) +
+ (sendpacket[7] << 16) + (sendpacket[8] << 8) +
+ sendpacket[9]);
+
+ if (!incoming)
+ {
+ /* If the destination network number is ours, make it 0 */
+ if( pnetwork_number == network_number)
+ {
+ sendpacket[6] = sendpacket[7] = sendpacket[8] =
+ sendpacket[9] = 0x00;
+ }
+ }
+ else
+ {
+ /* If the incoming network is 0, make it ours */
+ if( pnetwork_number == 0)
+ {
+ sendpacket[6] = (unsigned char)(network_number >> 24);
+ sendpacket[7] = (unsigned char)((network_number &
+ 0x00FF0000) >> 16);
+ sendpacket[8] = (unsigned char)((network_number &
+ 0x0000FF00) >> 8);
+ sendpacket[9] = (unsigned char)(network_number &
+ 0x000000FF);
+ }
+ }
+
+
+ pnetwork_number = (unsigned long)((sendpacket[18] << 24) +
+ (sendpacket[19] << 16) + (sendpacket[20] << 8) +
+ sendpacket[21]);
+
+ if( !incoming )
+ {
+ /* If the source network is ours, make it 0 */
+ if( pnetwork_number == network_number)
+ {
+ sendpacket[18] = sendpacket[19] = sendpacket[20] =
+ sendpacket[21] = 0x00;
+ }
+ }
+ else
+ {
+ /* If the source network is 0, make it ours */
+ if( pnetwork_number == 0 )
+ {
+ sendpacket[18] = (unsigned char)(network_number >> 24);
+ sendpacket[19] = (unsigned char)((network_number &
+ 0x00FF0000) >> 16);
+ sendpacket[20] = (unsigned char)((network_number &
+ 0x0000FF00) >> 8);
+ sendpacket[21] = (unsigned char)(network_number &
+ 0x000000FF);
+ }
+ }
+} /* switch_net_numbers */
+
+
+/****** End *****************************************************************/
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)