git.oblomov.eu Git - linux-2.6/blob - drivers/net/wan/sdla_ppp.c

   1 /*****************************************************************************
   2 * sdla_ppp.c    WANPIPE(tm) Multiprotocol WAN Link Driver. PPP module.
   3 *
   4 * Author:       Nenad Corbic <ncorbic@sangoma.com>
   5 *
   6 * Copyright:    (c) 1995-2001 Sangoma Technologies Inc.
   7 *
   8 *               This program is free software; you can redistribute it and/or
   9 *               modify it under the terms of the GNU General Public License
  10 *               as published by the Free Software Foundation; either version
  11 *               2 of the License, or (at your option) any later version.
  12 * ============================================================================
  13 * Feb 28, 2001  Nenad Corbic    o Updated if_tx_timeout() routine for
  14 *                                 2.4.X kernels.
  15 * Nov 29, 2000  Nenad Corbic    o Added the 2.4.x kernel support:
  16 *                                 get_ip_address() function has moved
  17 *                                 into the ppp_poll() routine. It cannot
  18 *                                 be called from an interrupt.
  19 * Nov 07, 2000  Nenad Corbic    o Added security features for UDP debugging:
  20 *                                 Deny all and specify allowed requests.
  21 * May 02, 2000  Nenad Corbic    o Added the dynamic interface shutdown
  22 *                                 option. When the link goes down, the
  23 *                                 network interface IFF_UP flag is reset.
  24 * Mar 06, 2000  Nenad Corbic    o Bug Fix: corrupted mbox recovery.
  25 * Feb 25, 2000  Nenad Corbic    o Fixed the FT1 UDP debugger problem.
  26 * Feb 09, 2000  Nenad Coribc    o Shutdown bug fix. update() was called
  27 *                                 with NULL dev pointer: no check.
  28 * Jan 24, 2000  Nenad Corbic    o Disabled use of CMD complete inter.
  29 * Dev 15, 1999  Nenad Corbic    o Fixed up header files for 2.0.X kernels
  30 * Oct 25, 1999  Nenad Corbic    o Support for 2.0.X kernels
  31 *                                 Moved dynamic route processing into
  32 *                                 a polling routine.
  33 * Oct 07, 1999  Nenad Corbic    o Support for S514 PCI card.
  34 *               Gideon Hack     o UPD and Updates executed using timer interrupt
  35 * Sep 10, 1999  Nenad Corbic    o Fixed up the /proc statistics
  36 * Jul 20, 1999  Nenad Corbic    o Remove the polling routines and use
  37 *                                 interrupts instead.
  38 * Sep 17, 1998  Jaspreet Singh  o Updates for 2.2.X Kernels.
  39 * Aug 13, 1998  Jaspreet Singh  o Improved Line Tracing.
  40 * Jun 22, 1998  David Fong      o Added remote IP address assignment
  41 * Mar 15, 1998  Alan Cox        o 2.1.8x basic port.
  42 * Apr 16, 1998  Jaspreet Singh  o using htons() for the IPX protocol.
  43 * Dec 09, 1997  Jaspreet Singh  o Added PAP and CHAP.
  44 *                               o Implemented new routines like
  45 *                                 ppp_set_inbnd_auth(), ppp_set_outbnd_auth(),
  46 *                                 tokenize() and strstrip().
  47 * Nov 27, 1997  Jaspreet Singh  o Added protection against enabling of irqs
  48 *                                 while they have been disabled.
  49 * Nov 24, 1997  Jaspreet Singh  o Fixed another RACE condition caused by
  50 *                                 disabling and enabling of irqs.
  51 *                               o Added new counters for stats on disable/enable
  52 *                                 IRQs.
  53 * Nov 10, 1997  Jaspreet Singh  o Initialized 'skb->mac.raw' to 'skb->data'
  54 *                                 before every netif_rx().
  55 *                               o Free up the device structure in del_if().
  56 * Nov 07, 1997  Jaspreet Singh  o Changed the delay to zero for Line tracing
  57 *                                 command.
  58 * Oct 20, 1997  Jaspreet Singh  o Added hooks in for Router UP time.
  59 * Oct 16, 1997  Jaspreet Singh  o The critical flag is used to maintain flow
  60 *                                 control by avoiding RACE conditions.  The
  61 *                                 cli() and restore_flags() are taken out.
  62 *                                 A new structure, "ppp_private_area", is added
  63 *                                 to provide Driver Statistics.
  64 * Jul 21, 1997  Jaspreet Singh  o Protected calls to sdla_peek() by adding
  65 *                                 save_flags(), cli() and restore_flags().
  66 * Jul 07, 1997  Jaspreet Singh  o Added configurable TTL for UDP packets
  67 *                               o Added ability to discard mulitcast and
  68 *                                 broacast source addressed packets.
  69 * Jun 27, 1997  Jaspreet Singh  o Added FT1 monitor capabilities
  70 *                                 New case (0x25) statement in if_send routine.
  71 *                                 Added a global variable rCount to keep track
  72 *                                 of FT1 status enabled on the board.
  73 * May 22, 1997  Jaspreet Singh  o Added change in the PPP_SET_CONFIG command for
  74 *                               508 card to reflect changes in the new
  75 *                               ppp508.sfm for supporting:continous transmission
  76 *                               of Configure-Request packets without receiving a
  77 *                               reply
  78 *                               OR-ed 0x300 to conf_flags
  79 *                               o Changed connect_tmout from 900 to 0
  80 * May 21, 1997  Jaspreet Singh  o Fixed UDP Management for multiple boards
  81 * Apr 25, 1997  Farhan Thawar    o added UDP Management stuff
  82 * Mar 11, 1997  Farhan Thawar   Version 3.1.1
  83 *                                o fixed (+1) bug in rx_intr()
  84 *                                o changed if_send() to return 0 if
  85 *                                  wandev.critical() is true
  86 *                                o free socket buffer in if_send() if
  87 *                                  returning 0
  88 * Jan 15, 1997  Gene Kozin      Version 3.1.0
  89 *                                o implemented exec() entry point
  90 * Jan 06, 1997  Gene Kozin      Initial version.
  91 *****************************************************************************/
  92
  93 #include <linux/module.h>
  94 #include <linux/kernel.h>       /* printk(), and other useful stuff */
  95 #include <linux/stddef.h>       /* offsetof(), etc. */
  96 #include <linux/errno.h>        /* return codes */
  97 #include <linux/string.h>       /* inline memset(), etc. */
  98 #include <linux/slab.h> /* kmalloc(), kfree() */
  99 #include <linux/wanrouter.h>    /* WAN router definitions */
 100 #include <linux/wanpipe.h>      /* WANPIPE common user API definitions */
 101 #include <linux/if_arp.h>       /* ARPHRD_* defines */
 102 #include <asm/byteorder.h>      /* htons(), etc. */
 103 #include <linux/in.h>           /* sockaddr_in */
 104
 105
 106 #include <asm/uaccess.h>
 107 #include <linux/inetdevice.h>
 108 #include <linux/netdevice.h>
 109
 110 #include <linux/if.h>
 111 #include <linux/sdla_ppp.h>             /* PPP firmware API definitions */
 112 #include <linux/sdlasfm.h>              /* S514 Type Definition */
 113 /****** Defines & Macros ****************************************************/
 114
 115 #define PPP_DFLT_MTU    1500            /* default MTU */
 116 #define PPP_MAX_MTU     4000            /* maximum MTU */
 117 #define PPP_HDR_LEN     1
 118
 119 #define MAX_IP_ERRORS 100
 120
 121 #define CONNECT_TIMEOUT (90*HZ)         /* link connection timeout */
 122 #define HOLD_DOWN_TIME  (5*HZ)          /* link hold down time : Changed from 30 to 5 */
 123
 124 /* For handle_IPXWAN() */
 125 #define CVHexToAscii(b) (((unsigned char)(b) > (unsigned char)9) ? ((unsigned char)'A' + ((unsigned char)(b) - (unsigned char)10)) : ((unsigned char)'0' + (unsigned char)(b)))
 126
 127 /* Macro for enabling/disabling debugging comments */
 128 //#define NEX_DEBUG
 129 #ifdef NEX_DEBUG
 130 #define NEX_PRINTK(format, a...) printk(format, ## a)
 131 #else
 132 #define NEX_PRINTK(format, a...)
 133 #endif /* NEX_DEBUG */
 134
 135 #define DCD(a)   ( a & 0x08 ? "HIGH" : "LOW" )
 136 #define CTS(a)   ( a & 0x20 ? "HIGH" : "LOW" )
 137 #define LCP(a)   ( a == 0x09 ? "OPEN" : "CLOSED" )
 138 #define IP(a)    ( a == 0x09 ? "ENABLED" : "DISABLED" )
 139
 140 #define TMR_INT_ENABLED_UPDATE          0x01
 141 #define TMR_INT_ENABLED_PPP_EVENT       0x02
 142 #define TMR_INT_ENABLED_UDP             0x04
 143 #define TMR_INT_ENABLED_CONFIG          0x20
 144
 145 /* Set Configuraton Command Definitions */
 146 #define PERCENT_TX_BUFF                 60
 147 #define TIME_BETWEEN_CONF_REQ           30
 148 #define TIME_BETWEEN_PAP_CHAP_REQ       30
 149 #define WAIT_PAP_CHAP_WITHOUT_REPLY     300
 150 #define WAIT_AFTER_DCD_CTS_LOW          5
 151 #define TIME_DCD_CTS_LOW_AFTER_LNK_DOWN 10
 152 #define WAIT_DCD_HIGH_AFTER_ENABLE_COMM 900
 153 #define MAX_CONF_REQ_WITHOUT_REPLY      10
 154 #define MAX_TERM_REQ_WITHOUT_REPLY      2
 155 #define NUM_CONF_NAK_WITHOUT_REPLY      5
 156 #define NUM_AUTH_REQ_WITHOUT_REPLY      10
 157
 158 #define END_OFFSET 0x1F0
 159
 160
 161 /******Data Structures*****************************************************/
 162
 163 /* This structure is placed in the private data area of the device structure.
 164  * The card structure used to occupy the private area but now the following
 165  * structure will incorporate the card structure along with PPP specific data
 166  */
 167
 168 typedef struct ppp_private_area
 169 {
 170         struct net_device *slave;
 171         sdla_t* card;
 172         unsigned long router_start_time;        /*router start time in sec */
 173         unsigned long tick_counter;             /*used for 5 second counter*/
 174         unsigned mc;                            /*multicast support on or off*/
 175         unsigned char enable_IPX;
 176         unsigned long network_number;
 177         unsigned char pap;
 178         unsigned char chap;
 179         unsigned char sysname[31];              /* system name for in-bnd auth*/
 180         unsigned char userid[511];              /* list of user ids */
 181         unsigned char passwd[511];              /* list of passwords */
 182         unsigned protocol;                      /* SKB Protocol */
 183         u32 ip_local;                           /* Local IP Address */
 184         u32 ip_remote;                          /* remote IP Address */
 185
 186         u32 ip_local_tmp;
 187         u32 ip_remote_tmp;
 188
 189         unsigned char timer_int_enabled;        /* Who enabled the timer inter*/
 190         unsigned char update_comms_stats;       /* Used by update function */
 191         unsigned long curr_trace_addr;          /* Trace information */
 192         unsigned long start_trace_addr;
 193         unsigned long end_trace_addr;
 194
 195         unsigned char interface_down;           /* Brind down interface when channel
 196                                                    goes down */
 197         unsigned long config_wait_timeout;      /* After if_open() if in dynamic if mode,
 198                                                    wait a few seconds before configuring */
 199
 200         unsigned short udp_pkt_lgth;
 201         char  udp_pkt_src;
 202         char  udp_pkt_data[MAX_LGTH_UDP_MGNT_PKT];
 203
 204         /* PPP specific statistics */
 205
 206         if_send_stat_t if_send_stat;
 207         rx_intr_stat_t rx_intr_stat;
 208         pipe_mgmt_stat_t pipe_mgmt_stat;
 209
 210         unsigned long router_up_time;
 211
 212         /* Polling work queue entry. Each interface
 213          * has its own work queue entry, which is used
 214          * to defer events from the interrupt */
 215         struct work_struct poll_work;
 216         struct timer_list poll_delay_timer;
 217
 218         u8 gateway;
 219         u8 config_ppp;
 220         u8 ip_error;
 221
 222 }ppp_private_area_t;
 223
 224 /* variable for keeping track of enabling/disabling FT1 monitor status */
 225 static int rCount = 0;
 226
 227 extern void disable_irq(unsigned int);
 228 extern void enable_irq(unsigned int);
 229
 230 /****** Function Prototypes *************************************************/
 231
 232 /* WAN link driver entry points. These are called by the WAN router module. */
 233 static int update(struct wan_device *wandev);
 234 static int new_if(struct wan_device *wandev, struct net_device *dev,
 235                   wanif_conf_t *conf);
 236 static int del_if(struct wan_device *wandev, struct net_device *dev);
 237
 238 /* WANPIPE-specific entry points */
 239 static int wpp_exec (struct sdla *card, void *u_cmd, void *u_data);
 240
 241 /* Network device interface */
 242 static int if_init(struct net_device *dev);
 243 static int if_open(struct net_device *dev);
 244 static int if_close(struct net_device *dev);
 245 static int if_header(struct sk_buff *skb, struct net_device *dev,
 246                      unsigned short type,
 247                      void *daddr, void *saddr, unsigned len);
 248
 249 static void if_tx_timeout(struct net_device *dev);
 250
 251 static int if_rebuild_hdr(struct sk_buff *skb);
 252 static struct net_device_stats *if_stats(struct net_device *dev);
 253 static int if_send(struct sk_buff *skb, struct net_device *dev);
 254
 255
 256 /* PPP firmware interface functions */
 257 static int ppp_read_version(sdla_t *card, char *str);
 258 static int ppp_set_outbnd_auth(sdla_t *card, ppp_private_area_t *ppp_priv_area);
 259 static int ppp_set_inbnd_auth(sdla_t *card, ppp_private_area_t *ppp_priv_area);
 260 static int ppp_configure(sdla_t *card, void *data);
 261 static int ppp_set_intr_mode(sdla_t *card, unsigned char mode);
 262 static int ppp_comm_enable(sdla_t *card);
 263 static int ppp_comm_disable(sdla_t *card);
 264 static int ppp_comm_disable_shutdown(sdla_t *card);
 265 static int ppp_get_err_stats(sdla_t *card);
 266 static int ppp_send(sdla_t *card, void *data, unsigned len, unsigned proto);
 267 static int ppp_error(sdla_t *card, int err, ppp_mbox_t *mb);
 268
 269 static void wpp_isr(sdla_t *card);
 270 static void rx_intr(sdla_t *card);
 271 static void event_intr(sdla_t *card);
 272 static void timer_intr(sdla_t *card);
 273
 274 /* Background polling routines */
 275 static void process_route(sdla_t *card);
 276 static void retrigger_comm(sdla_t *card);
 277
 278 /* Miscellaneous functions */
 279 static int read_info( sdla_t *card );
 280 static int read_connection_info (sdla_t *card);
 281 static void remove_route( sdla_t *card );
 282 static int config508(struct net_device *dev, sdla_t *card);
 283 static void show_disc_cause(sdla_t * card, unsigned cause);
 284 static int reply_udp( unsigned char *data, unsigned int mbox_len );
 285 static void process_udp_mgmt_pkt(sdla_t *card, struct net_device *dev,
 286                                 ppp_private_area_t *ppp_priv_area);
 287 static void init_ppp_tx_rx_buff( sdla_t *card );
 288 static int intr_test( sdla_t *card );
 289 static int udp_pkt_type( struct sk_buff *skb , sdla_t *card);
 290 static void init_ppp_priv_struct( ppp_private_area_t *ppp_priv_area);
 291 static void init_global_statistics( sdla_t *card );
 292 static int tokenize(char *str, char **tokens);
 293 static char* strstrip(char *str, char *s);
 294 static int chk_bcast_mcast_addr(sdla_t* card, struct net_device* dev,
 295                                 struct sk_buff *skb);
 296
 297 static int config_ppp (sdla_t *);
 298 static void ppp_poll(struct net_device *dev);
 299 static void trigger_ppp_poll(struct net_device *dev);
 300 static void ppp_poll_delay (unsigned long dev_ptr);
 301
 302
 303 static int Read_connection_info;
 304 static int Intr_test_counter;
 305 static unsigned short available_buffer_space;
 306
 307
 308 /* IPX functions */
 309 static void switch_net_numbers(unsigned char *sendpacket, unsigned long network_number,
 310                                unsigned char incoming);
 311 static int handle_IPXWAN(unsigned char *sendpacket, char *devname, unsigned char enable_PX,
 312                          unsigned long network_number, unsigned short proto);
 313
 314 /* Lock Functions */
 315 static void s508_lock (sdla_t *card, unsigned long *smp_flags);
 316 static void s508_unlock (sdla_t *card, unsigned long *smp_flags);
 317
 318 static int store_udp_mgmt_pkt(char udp_pkt_src, sdla_t* card,
 319                                 struct sk_buff *skb, struct net_device* dev,
 320                                 ppp_private_area_t* ppp_priv_area );
 321 static unsigned short calc_checksum (char *data, int len);
 322 static void disable_comm (sdla_t *card);
 323 static int detect_and_fix_tx_bug (sdla_t *card);
 324
 325 /****** Public Functions ****************************************************/
 326
 327 /*============================================================================
 328  * PPP protocol initialization routine.
 329  *
 330  * This routine is called by the main WANPIPE module during setup.  At this
 331  * point adapter is completely initialized and firmware is running.
 332  *  o read firmware version (to make sure it's alive)
 333  *  o configure adapter
 334  *  o initialize protocol-specific fields of the adapter data space.
 335  *
 336  * Return:      0       o.k.
 337  *              < 0     failure.
 338  */
 339 int wpp_init(sdla_t *card, wandev_conf_t *conf)
 340 {
 341         ppp_flags_t *flags;
 342         union
 343         {
 344                 char str[80];
 345         } u;
 346
 347         /* Verify configuration ID */
 348         if (conf->config_id != WANCONFIG_PPP) {
 349
 350                 printk(KERN_INFO "%s: invalid configuration ID %u!\n",
 351                         card->devname, conf->config_id);
 352                 return -EINVAL;
 353
 354         }
 355
 356         /* Initialize miscellaneous pointers to structures on the adapter */
 357         switch (card->hw.type) {
 358
 359                 case SDLA_S508:
 360                         card->mbox =(void*)(card->hw.dpmbase + PPP508_MB_OFFS);
 361                         card->flags=(void*)(card->hw.dpmbase + PPP508_FLG_OFFS);
 362                         break;
 363
 364                 case SDLA_S514:
 365                         card->mbox =(void*)(card->hw.dpmbase + PPP514_MB_OFFS);
 366                         card->flags=(void*)(card->hw.dpmbase + PPP514_FLG_OFFS);
 367                         break;
 368
 369                 default:
 370                         return -EINVAL;
 371
 372         }
 373         flags = card->flags;
 374
 375         /* Read firmware version.  Note that when adapter initializes, it
 376          * clears the mailbox, so it may appear that the first command was
 377          * executed successfully when in fact it was merely erased. To work
 378          * around this, we execute the first command twice.
 379          */
 380         if (ppp_read_version(card, NULL) || ppp_read_version(card, u.str))
 381                 return -EIO;
 382
 383         printk(KERN_INFO "%s: running PPP firmware v%s\n",card->devname, u.str);
 384         /* Adjust configuration and set defaults */
 385         card->wandev.mtu = (conf->mtu) ?
 386                 min_t(unsigned int, conf->mtu, PPP_MAX_MTU) : PPP_DFLT_MTU;
 387
 388         card->wandev.bps        = conf->bps;
 389         card->wandev.interface  = conf->interface;
 390         card->wandev.clocking   = conf->clocking;
 391         card->wandev.station    = conf->station;
 392         card->isr               = &wpp_isr;
 393         card->poll              = NULL;
 394         card->exec              = &wpp_exec;
 395         card->wandev.update     = &update;
 396         card->wandev.new_if     = &new_if;
 397         card->wandev.del_if     = &del_if;
 398         card->wandev.udp_port   = conf->udp_port;
 399         card->wandev.ttl        = conf->ttl;
 400         card->wandev.state      = WAN_DISCONNECTED;
 401         card->disable_comm      = &disable_comm;
 402         card->irq_dis_if_send_count = 0;
 403         card->irq_dis_poll_count = 0;
 404         card->u.p.authenticator = conf->u.ppp.authenticator;
 405         card->u.p.ip_mode       = conf->u.ppp.ip_mode ?
 406                                  conf->u.ppp.ip_mode : WANOPT_PPP_STATIC;
 407         card->TracingEnabled    = 0;
 408         Read_connection_info    = 1;
 409
 410         /* initialize global statistics */
 411         init_global_statistics( card );
 412
 413
 414
 415         if (!card->configured){
 416                 int err;
 417
 418                 Intr_test_counter = 0;
 419                 err = intr_test(card);
 420
 421                 if(err || (Intr_test_counter < MAX_INTR_TEST_COUNTER)) {
 422                         printk("%s: Interrupt Test Failed, Counter: %i\n",
 423                                 card->devname, Intr_test_counter);
 424                         printk( "%s: Please choose another interrupt\n",card->devname);
 425                         return -EIO;
 426                 }
 427
 428                 printk(KERN_INFO "%s: Interrupt Test Passed, Counter: %i\n",
 429                         card->devname, Intr_test_counter);
 430                 card->configured = 1;
 431         }
 432
 433         ppp_set_intr_mode(card, PPP_INTR_TIMER);
 434
 435         /* Turn off the transmit and timer interrupt */
 436         flags->imask &= ~PPP_INTR_TIMER;
 437
 438         printk(KERN_INFO "\n");
 439
 440         return 0;
 441 }
 442
 443 /******* WAN Device Driver Entry Points *************************************/
 444
 445 /*============================================================================
 446  * Update device status & statistics.
 447  */
 448 static int update(struct wan_device *wandev)
 449 {
 450         sdla_t* card = wandev->private;
 451         struct net_device* dev;
 452         volatile ppp_private_area_t *ppp_priv_area;
 453         ppp_flags_t *flags = card->flags;
 454         unsigned long timeout;
 455
 456         /* sanity checks */
 457         if ((wandev == NULL) || (wandev->private == NULL))
 458                 return -EFAULT;
 459
 460         if (wandev->state == WAN_UNCONFIGURED)
 461                 return -ENODEV;
 462
 463         /* Shutdown bug fix. This function can be
 464          * called with NULL dev pointer during
 465          * shutdown
 466          */
 467         if ((dev=card->wandev.dev) == NULL){
 468                 return -ENODEV;
 469         }
 470
 471         if ((ppp_priv_area=dev->priv) == NULL){
 472                 return -ENODEV;
 473         }
 474
 475         ppp_priv_area->update_comms_stats = 2;
 476         ppp_priv_area->timer_int_enabled |= TMR_INT_ENABLED_UPDATE;
 477         flags->imask |= PPP_INTR_TIMER;
 478
 479         /* wait a maximum of 1 second for the statistics to be updated */
 480         timeout = jiffies;
 481         for(;;) {
 482                 if(ppp_priv_area->update_comms_stats == 0){
 483                         break;
 484                 }
 485                 if ((jiffies - timeout) > (1 * HZ)){
 486                         ppp_priv_area->update_comms_stats = 0;
 487                         ppp_priv_area->timer_int_enabled &=
 488                                 ~TMR_INT_ENABLED_UPDATE;
 489                         return -EAGAIN;
 490                 }
 491         }
 492
 493         return 0;
 494 }
 495
 496 /*============================================================================
 497  * Create new logical channel.
 498  * This routine is called by the router when ROUTER_IFNEW IOCTL is being
 499  * handled.
 500  * o parse media- and hardware-specific configuration
 501  * o make sure that a new channel can be created
 502  * o allocate resources, if necessary
 503  * o prepare network device structure for registaration.
 504  *
 505  * Return:      0       o.k.
 506  *              < 0     failure (channel will not be created)
 507  */
 508 static int new_if(struct wan_device *wandev, struct net_device *dev,
 509                   wanif_conf_t *conf)
 510 {
 511         sdla_t *card = wandev->private;
 512         ppp_private_area_t *ppp_priv_area;
 513
 514         if (wandev->ndev)
 515                 return -EEXIST;
 516
 517
 518         printk(KERN_INFO "%s: Configuring Interface: %s\n",
 519                         card->devname, conf->name);
 520
 521         if ((conf->name[0] == '\0') || (strlen(conf->name) > WAN_IFNAME_SZ)) {
 522
 523                 printk(KERN_INFO "%s: Invalid interface name!\n",
 524                         card->devname);
 525                 return -EINVAL;
 526
 527         }
 528
 529         /* allocate and initialize private data */
 530         ppp_priv_area = kmalloc(sizeof(ppp_private_area_t), GFP_KERNEL);
 531
 532         if( ppp_priv_area == NULL )
 533                 return  -ENOMEM;
 534
 535         memset(ppp_priv_area, 0, sizeof(ppp_private_area_t));
 536
 537         ppp_priv_area->card = card;
 538
 539         /* initialize data */
 540         strcpy(card->u.p.if_name, conf->name);
 541
 542         /* initialize data in ppp_private_area structure */
 543
 544         init_ppp_priv_struct( ppp_priv_area );
 545
 546         ppp_priv_area->mc = conf->mc;
 547         ppp_priv_area->pap = conf->pap;
 548         ppp_priv_area->chap = conf->chap;
 549
 550         /* Option to bring down the interface when
 551          * the link goes down */
 552         if (conf->if_down){
 553                 set_bit(DYN_OPT_ON,&ppp_priv_area->interface_down);
 554                 printk("%s: Dynamic interface configuration enabled\n",
 555                         card->devname);
 556         }
 557
 558         /* If no user ids are specified */
 559         if(!strlen(conf->userid) && (ppp_priv_area->pap||ppp_priv_area->chap)){
 560                 kfree(ppp_priv_area);
 561                 return -EINVAL;
 562         }
 563
 564         /* If no passwords are specified */
 565         if(!strlen(conf->passwd) && (ppp_priv_area->pap||ppp_priv_area->chap)){
 566                 kfree(ppp_priv_area);
 567                 return -EINVAL;
 568         }
 569
 570         if(strlen(conf->sysname) > 31){
 571                 kfree(ppp_priv_area);
 572                 return -EINVAL;
 573         }
 574
 575         /* If no system name is specified */
 576         if(!strlen(conf->sysname) && (card->u.p.authenticator)){
 577                 kfree(ppp_priv_area);
 578                 return -EINVAL;
 579         }
 580
 581         /* copy the data into the ppp private structure */
 582         memcpy(ppp_priv_area->userid, conf->userid, strlen(conf->userid));
 583         memcpy(ppp_priv_area->passwd, conf->passwd, strlen(conf->passwd));
 584         memcpy(ppp_priv_area->sysname, conf->sysname, strlen(conf->sysname));
 585
 586
 587         ppp_priv_area->enable_IPX = conf->enable_IPX;
 588         if (conf->network_number){
 589                 ppp_priv_area->network_number = conf->network_number;
 590         }else{
 591                 ppp_priv_area->network_number = 0xDEADBEEF;
 592         }
 593
 594         /* Tells us that if this interface is a
 595          * gateway or not */
 596         if ((ppp_priv_area->gateway = conf->gateway) == WANOPT_YES){
 597                 printk(KERN_INFO "%s: Interface %s is set as a gateway.\n",
 598                         card->devname,card->u.p.if_name);
 599         }
 600
 601         /* prepare network device data space for registration */
 602         strcpy(dev->name,card->u.p.if_name);
 603
 604         dev->init = &if_init;
 605         dev->priv = ppp_priv_area;
 606         dev->mtu = min_t(unsigned int, dev->mtu, card->wandev.mtu);
 607
 608         /* Initialize the polling work routine */
 609         INIT_WORK(&ppp_priv_area->poll_work, (void*)(void*)ppp_poll, dev);
 610
 611         /* Initialize the polling delay timer */
 612         init_timer(&ppp_priv_area->poll_delay_timer);
 613         ppp_priv_area->poll_delay_timer.data = (unsigned long)dev;
 614         ppp_priv_area->poll_delay_timer.function = ppp_poll_delay;
 615
 616
 617         /* Since we start with dummy IP addresses we can say
 618          * that route exists */
 619         printk(KERN_INFO "\n");
 620
 621         return 0;
 622 }
 623
 624 /*============================================================================
 625  * Delete logical channel.
 626  */
 627 static int del_if(struct wan_device *wandev, struct net_device *dev)
 628 {
 629         return 0;
 630 }
 631
 632 static void disable_comm (sdla_t *card)
 633 {
 634         ppp_comm_disable_shutdown(card);
 635         return;
 636 }
 637
 638 /****** WANPIPE-specific entry points ***************************************/
 639
 640 /*============================================================================
 641  * Execute adapter interface command.
 642  */
 643
 644 //FIXME: Why do we need this ????
 645 static int wpp_exec(struct sdla *card, void *u_cmd, void *u_data)
 646 {
 647         ppp_mbox_t *mbox = card->mbox;
 648         int len;
 649
 650         if (copy_from_user((void*)&mbox->cmd, u_cmd, sizeof(ppp_cmd_t)))
 651                 return -EFAULT;
 652
 653         len = mbox->cmd.length;
 654
 655         if (len) {
 656
 657                 if( copy_from_user((void*)&mbox->data, u_data, len))
 658                         return -EFAULT;
 659
 660         }
 661
 662         /* execute command */
 663         if (!sdla_exec(mbox))
 664                 return -EIO;
 665
 666         /* return result */
 667         if( copy_to_user(u_cmd, (void*)&mbox->cmd, sizeof(ppp_cmd_t)))
 668                 return -EFAULT;
 669         len = mbox->cmd.length;
 670
 671         if (len && u_data && copy_to_user(u_data, (void*)&mbox->data, len))
 672                 return -EFAULT;
 673
 674         return 0;
 675 }
 676
 677 /****** Network Device Interface ********************************************/
 678
 679 /*============================================================================
 680  * Initialize Linux network interface.
 681  *
 682  * This routine is called only once for each interface, during Linux network
 683  * interface registration.  Returning anything but zero will fail interface
 684  * registration.
 685  */
 686 static int if_init(struct net_device *dev)
 687 {
 688         ppp_private_area_t *ppp_priv_area = dev->priv;
 689         sdla_t *card = ppp_priv_area->card;
 690         struct wan_device *wandev = &card->wandev;
 691
 692         /* Initialize device driver entry points */
 693         dev->open               = &if_open;
 694         dev->stop               = &if_close;
 695         dev->hard_header        = &if_header;
 696         dev->rebuild_header     = &if_rebuild_hdr;
 697         dev->hard_start_xmit    = &if_send;
 698         dev->get_stats          = &if_stats;
 699         dev->tx_timeout         = &if_tx_timeout;
 700         dev->watchdog_timeo     = TX_TIMEOUT;
 701
 702         /* Initialize media-specific parameters */
 703         dev->type               = ARPHRD_PPP;   /* ARP h/w type */
 704         dev->flags              |= IFF_POINTOPOINT;
 705         dev->flags              |= IFF_NOARP;
 706
 707         /* Enable Mulitcasting if specified by user*/
 708         if (ppp_priv_area->mc == WANOPT_YES){
 709                 dev->flags      |= IFF_MULTICAST;
 710         }
 711
 712         dev->mtu                = wandev->mtu;
 713         dev->hard_header_len    = PPP_HDR_LEN;  /* media header length */
 714
 715         /* Initialize hardware parameters (just for reference) */
 716         dev->irq                = wandev->irq;
 717         dev->dma                = wandev->dma;
 718         dev->base_addr          = wandev->ioport;
 719         dev->mem_start          = wandev->maddr;
 720         dev->mem_end            = wandev->maddr + wandev->msize - 1;
 721
 722         /* Set transmit buffer queue length */
 723         dev->tx_queue_len = 100;
 724         SET_MODULE_OWNER(dev);
 725
 726         return 0;
 727 }
 728
 729 /*============================================================================
 730  * Open network interface.
 731  * o enable communications and interrupts.
 732  * o prevent module from unloading by incrementing use count
 733  *
 734  * Return 0 if O.k. or errno.
 735  */
 736 static int if_open(struct net_device *dev)
 737 {
 738         ppp_private_area_t *ppp_priv_area = dev->priv;
 739         sdla_t *card = ppp_priv_area->card;
 740         struct timeval tv;
 741         //unsigned long smp_flags;
 742
 743         if (netif_running(dev))
 744                 return -EBUSY;
 745
 746         wanpipe_open(card);
 747
 748         netif_start_queue(dev);
 749
 750         do_gettimeofday( &tv );
 751         ppp_priv_area->router_start_time = tv.tv_sec;
 752
 753         /* We cannot configure the card here because we don't
 754          * have access to the interface IP addresses.
 755          * Once the interface initilization is complete, we will be
 756          * able to access the IP addresses.  Therefore,
 757          * configure the ppp link in the poll routine */
 758         set_bit(0,&ppp_priv_area->config_ppp);
 759         ppp_priv_area->config_wait_timeout=jiffies;
 760
 761         /* Start the PPP configuration after 1sec delay.
 762          * This will give the interface initilization time
 763          * to finish its configuration */
 764         mod_timer(&ppp_priv_area->poll_delay_timer, jiffies + HZ);
 765         return 0;
 766 }
 767
 768 /*============================================================================
 769  * Close network interface.
 770  * o if this is the last open, then disable communications and interrupts.
 771  * o reset flags.
 772  */
 773 static int if_close(struct net_device *dev)
 774 {
 775         ppp_private_area_t *ppp_priv_area = dev->priv;
 776         sdla_t *card = ppp_priv_area->card;
 777
 778         netif_stop_queue(dev);
 779         wanpipe_close(card);
 780
 781         del_timer (&ppp_priv_area->poll_delay_timer);
 782         return 0;
 783 }
 784
 785 /*============================================================================
 786  * Build media header.
 787  *
 788  * The trick here is to put packet type (Ethertype) into 'protocol' field of
 789  * the socket buffer, so that we don't forget it.  If packet type is not
 790  * supported, set skb->protocol to 0 and discard packet later.
 791  *
 792  * Return:      media header length.
 793  */
 794 static int if_header(struct sk_buff *skb, struct net_device *dev,
 795         unsigned short type, void *daddr, void *saddr, unsigned len)
 796 {
 797         switch (type)
 798         {
 799                 case ETH_P_IP:
 800                 case ETH_P_IPX:
 801                         skb->protocol = htons(type);
 802                         break;
 803
 804                 default:
 805                         skb->protocol = 0;
 806         }
 807
 808         return PPP_HDR_LEN;
 809 }
 810
 811 /*============================================================================
 812  * Re-build media header.
 813  *
 814  * Return:      1       physical address resolved.
 815  *              0       physical address not resolved
 816  */
 817 static int if_rebuild_hdr (struct sk_buff *skb)
 818 {
 819         struct net_device *dev = skb->dev;
 820         ppp_private_area_t *ppp_priv_area = dev->priv;
 821         sdla_t *card = ppp_priv_area->card;
 822
 823         printk(KERN_INFO "%s: rebuild_header() called for interface %s!\n",
 824                 card->devname, dev->name);
 825         return 1;
 826 }
 827
 828 /*============================================================================
 829  * Handle transmit timeout event from netif watchdog
 830  */
 831 static void if_tx_timeout(struct net_device *dev)
 832 {
 833         ppp_private_area_t* chan = dev->priv;
 834         sdla_t *card = chan->card;
 835
 836         /* If our device stays busy for at least 5 seconds then we will
 837          * kick start the device by making dev->tbusy = 0.  We expect
 838          * that our device never stays busy more than 5 seconds. So this
 839          * is only used as a last resort.
 840          */
 841
 842         ++ chan->if_send_stat.if_send_tbusy;
 843         ++card->wandev.stats.collisions;
 844
 845         printk (KERN_INFO "%s: Transmit timed out on %s\n", card->devname,dev->name);
 846         ++chan->if_send_stat.if_send_tbusy_timeout;
 847         netif_wake_queue (dev);
 848 }
 849
 850
 851
 852 /*============================================================================
 853  * Send a packet on a network interface.
 854  * o set tbusy flag (marks start of the transmission) to block a timer-based
 855  *   transmit from overlapping.
 856  * o check link state. If link is not up, then drop the packet.
 857  * o execute adapter send command.
 858  * o free socket buffer
 859  *
 860  * Return:      0       complete (socket buffer must be freed)
 861  *              non-0   packet may be re-transmitted (tbusy must be set)
 862  *
 863  * Notes:
 864  * 1. This routine is called either by the protocol stack or by the "net
 865  *    bottom half" (with interrupts enabled).
 866  * 2. Setting tbusy flag will inhibit further transmit requests from the
 867  *    protocol stack and can be used for flow control with protocol layer.
 868  */
 869 static int if_send (struct sk_buff *skb, struct net_device *dev)
 870 {
 871         ppp_private_area_t *ppp_priv_area = dev->priv;
 872         sdla_t *card = ppp_priv_area->card;
 873         unsigned char *sendpacket;
 874         unsigned long smp_flags;
 875         ppp_flags_t *flags = card->flags;
 876         int udp_type;
 877         int err=0;
 878
 879         ++ppp_priv_area->if_send_stat.if_send_entry;
 880
 881         netif_stop_queue(dev);
 882
 883         if (skb == NULL) {
 884
 885                 /* If we get here, some higher layer thinks we've missed an
 886                  * tx-done interrupt.
 887                  */
 888                 printk(KERN_INFO "%s: interface %s got kicked!\n",
 889                         card->devname, dev->name);
 890
 891                 ++ppp_priv_area->if_send_stat.if_send_skb_null;
 892
 893                 netif_wake_queue(dev);
 894                 return 0;
 895         }
 896
 897         sendpacket = skb->data;
 898
 899         udp_type = udp_pkt_type( skb, card );
 900
 901
 902         if (udp_type == UDP_PTPIPE_TYPE){
 903                 if(store_udp_mgmt_pkt(UDP_PKT_FRM_STACK, card, skb, dev,
 904                                       ppp_priv_area)){
 905                         flags->imask |= PPP_INTR_TIMER;
 906                 }
 907                 ++ppp_priv_area->if_send_stat.if_send_PIPE_request;
 908                 netif_start_queue(dev);
 909                 return 0;
 910         }
 911
 912         /* Check for broadcast and multicast addresses
 913          * If found, drop (deallocate) a packet and return.
 914          */
 915         if(chk_bcast_mcast_addr(card, dev, skb)){
 916                 ++card->wandev.stats.tx_dropped;
 917                 dev_kfree_skb_any(skb);
 918                 netif_start_queue(dev);
 919                 return 0;
 920         }
 921
 922
 923         if(card->hw.type != SDLA_S514){
 924                 s508_lock(card,&smp_flags);
 925         }
 926
 927         if (test_and_set_bit(SEND_CRIT, (void*)&card->wandev.critical)) {
 928
 929                 printk(KERN_INFO "%s: Critical in if_send: %lx\n",
 930                                 card->wandev.name,card->wandev.critical);
 931
 932                 ++card->wandev.stats.tx_dropped;
 933                 ++ppp_priv_area->if_send_stat.if_send_critical_non_ISR;
 934                 netif_start_queue(dev);
 935                 goto if_send_exit_crit;
 936         }
 937
 938         if (card->wandev.state != WAN_CONNECTED) {
 939
 940                 ++ppp_priv_area->if_send_stat.if_send_wan_disconnected;
 941                 ++card->wandev.stats.tx_dropped;
 942                 netif_start_queue(dev);
 943
 944         } else if (!skb->protocol) {
 945                 ++ppp_priv_area->if_send_stat.if_send_protocol_error;
 946                 ++card->wandev.stats.tx_errors;
 947                 netif_start_queue(dev);
 948
 949         } else {
 950
 951                 /*If it's IPX change the network numbers to 0 if they're ours.*/
 952                 if( skb->protocol == htons(ETH_P_IPX) ) {
 953                         if(ppp_priv_area->enable_IPX) {
 954                                 switch_net_numbers( skb->data,
 955                                         ppp_priv_area->network_number, 0);
 956                         } else {
 957                                 ++card->wandev.stats.tx_dropped;
 958                                 netif_start_queue(dev);
 959                                 goto if_send_exit_crit;
 960                         }
 961                 }
 962
 963                 if (ppp_send(card, skb->data, skb->len, skb->protocol)) {
 964                         netif_stop_queue(dev);
 965                         ++ppp_priv_area->if_send_stat.if_send_adptr_bfrs_full;
 966                         ++ppp_priv_area->if_send_stat.if_send_tx_int_enabled;
 967                 } else {
 968                         ++ppp_priv_area->if_send_stat.if_send_bfr_passed_to_adptr;
 969                         ++card->wandev.stats.tx_packets;
 970                         card->wandev.stats.tx_bytes += skb->len;
 971                         netif_start_queue(dev);
 972                         dev->trans_start = jiffies;
 973                 }
 974         }
 975
 976 if_send_exit_crit:
 977
 978         if (!(err=netif_queue_stopped(dev))){
 979                 dev_kfree_skb_any(skb);
 980         }else{
 981                 ppp_priv_area->tick_counter = jiffies;
 982                 flags->imask |= PPP_INTR_TXRDY; /* unmask Tx interrupts */
 983         }
 984
 985         clear_bit(SEND_CRIT,&card->wandev.critical);
 986         if(card->hw.type != SDLA_S514){
 987                 s508_unlock(card,&smp_flags);
 988         }
 989
 990         return err;
 991 }
 992
 993
 994 /*=============================================================================
 995  * Store a UDP management packet for later processing.
 996  */
 997
 998 static int store_udp_mgmt_pkt(char udp_pkt_src, sdla_t* card,
 999                                 struct sk_buff *skb, struct net_device* dev,
1000                                 ppp_private_area_t* ppp_priv_area )
1001 {
1002         int udp_pkt_stored = 0;
1003
1004         if(!ppp_priv_area->udp_pkt_lgth && (skb->len<=MAX_LGTH_UDP_MGNT_PKT)){
1005                 ppp_priv_area->udp_pkt_lgth = skb->len;
1006                 ppp_priv_area->udp_pkt_src = udp_pkt_src;
1007                 memcpy(ppp_priv_area->udp_pkt_data, skb->data, skb->len);
1008                 ppp_priv_area->timer_int_enabled |= TMR_INT_ENABLED_UDP;
1009                 ppp_priv_area->protocol = skb->protocol;
1010                 udp_pkt_stored = 1;
1011         }else{
1012                 if (skb->len > MAX_LGTH_UDP_MGNT_PKT){
1013                         printk(KERN_INFO "%s: PIPEMON UDP request too long : %i\n",
1014                                 card->devname, skb->len);
1015                 }else{
1016                         printk(KERN_INFO "%s: PIPEMON UPD request already pending\n",
1017                                 card->devname);
1018                 }
1019                 ppp_priv_area->udp_pkt_lgth = 0;
1020         }
1021
1022         if(udp_pkt_src == UDP_PKT_FRM_STACK){
1023                 dev_kfree_skb_any(skb);
1024         }else{
1025                 dev_kfree_skb_any(skb);
1026         }
1027
1028         return(udp_pkt_stored);
1029 }
1030
1031
1032
1033 /*============================================================================
1034  * Reply to UDP Management system.
1035  * Return length of reply.
1036  */
1037 static int reply_udp( unsigned char *data, unsigned int mbox_len )
1038 {
1039         unsigned short len, udp_length, temp, ip_length;
1040         unsigned long ip_temp;
1041         int even_bound = 0;
1042         ppp_udp_pkt_t *p_udp_pkt = (ppp_udp_pkt_t *)data;
1043
1044         /* Set length of packet */
1045         len = sizeof(ip_pkt_t)+
1046               sizeof(udp_pkt_t)+
1047               sizeof(wp_mgmt_t)+
1048               sizeof(cblock_t)+
1049               mbox_len;
1050
1051         /* fill in UDP reply */
1052         p_udp_pkt->wp_mgmt.request_reply = UDPMGMT_REPLY;
1053
1054         /* fill in UDP length */
1055         udp_length = sizeof(udp_pkt_t)+
1056                      sizeof(wp_mgmt_t)+
1057                      sizeof(cblock_t)+
1058                      mbox_len;
1059
1060
1061         /* put it on an even boundary */
1062         if ( udp_length & 0x0001 ) {
1063                 udp_length += 1;
1064                 len += 1;
1065                 even_bound=1;
1066         }
1067
1068         temp = (udp_length<<8)|(udp_length>>8);
1069         p_udp_pkt->udp_pkt.udp_length = temp;
1070
1071
1072         /* swap UDP ports */
1073         temp = p_udp_pkt->udp_pkt.udp_src_port;
1074         p_udp_pkt->udp_pkt.udp_src_port =
1075                         p_udp_pkt->udp_pkt.udp_dst_port;
1076         p_udp_pkt->udp_pkt.udp_dst_port = temp;
1077
1078
1079         /* add UDP pseudo header */
1080         temp = 0x1100;
1081         *((unsigned short *)(p_udp_pkt->data+mbox_len+even_bound)) = temp;
1082         temp = (udp_length<<8)|(udp_length>>8);
1083         *((unsigned short *)(p_udp_pkt->data+mbox_len+even_bound+2)) = temp;
1084
1085         /* calculate UDP checksum */
1086         p_udp_pkt->udp_pkt.udp_checksum = 0;
1087         p_udp_pkt->udp_pkt.udp_checksum =
1088                 calc_checksum(&data[UDP_OFFSET],udp_length+UDP_OFFSET);
1089
1090         /* fill in IP length */
1091         ip_length = udp_length + sizeof(ip_pkt_t);
1092         temp = (ip_length<<8)|(ip_length>>8);
1093         p_udp_pkt->ip_pkt.total_length = temp;
1094
1095         /* swap IP addresses */
1096         ip_temp = p_udp_pkt->ip_pkt.ip_src_address;
1097         p_udp_pkt->ip_pkt.ip_src_address = p_udp_pkt->ip_pkt.ip_dst_address;
1098         p_udp_pkt->ip_pkt.ip_dst_address = ip_temp;
1099
1100         /* fill in IP checksum */
1101         p_udp_pkt->ip_pkt.hdr_checksum = 0;
1102         p_udp_pkt->ip_pkt.hdr_checksum = calc_checksum(data,sizeof(ip_pkt_t));
1103
1104         return len;
1105
1106 } /* reply_udp */
1107
1108 unsigned short calc_checksum (char *data, int len)
1109 {
1110         unsigned short temp;
1111         unsigned long sum=0;
1112         int i;
1113
1114         for( i = 0; i <len; i+=2 ) {
1115                 memcpy(&temp,&data[i],2);
1116                 sum += (unsigned long)temp;
1117         }
1118
1119         while (sum >> 16 ) {
1120                 sum = (sum & 0xffffUL) + (sum >> 16);
1121         }
1122
1123         temp = (unsigned short)sum;
1124         temp = ~temp;
1125
1126         if( temp == 0 )
1127                 temp = 0xffff;
1128
1129         return temp;
1130 }
1131
1132 /*
1133    If incoming is 0 (outgoing)- if the net numbers is ours make it 0
1134    if incoming is 1 - if the net number is 0 make it ours
1135
1136 */
1137 static void switch_net_numbers(unsigned char *sendpacket, unsigned long network_number, unsigned char incoming)
1138 {
1139         unsigned long pnetwork_number;
1140
1141         pnetwork_number = (unsigned long)((sendpacket[6] << 24) +
1142                           (sendpacket[7] << 16) + (sendpacket[8] << 8) +
1143                           sendpacket[9]);
1144
1145         if (!incoming) {
1146                 //If the destination network number is ours, make it 0
1147                 if( pnetwork_number == network_number) {
1148                         sendpacket[6] = sendpacket[7] = sendpacket[8] =
1149                                          sendpacket[9] = 0x00;
1150                 }
1151         } else {
1152                 //If the incoming network is 0, make it ours
1153                 if( pnetwork_number == 0) {
1154                         sendpacket[6] = (unsigned char)(network_number >> 24);
1155                         sendpacket[7] = (unsigned char)((network_number &
1156                                          0x00FF0000) >> 16);
1157                         sendpacket[8] = (unsigned char)((network_number &
1158                                          0x0000FF00) >> 8);
1159                         sendpacket[9] = (unsigned char)(network_number &
1160                                          0x000000FF);
1161                 }
1162         }
1163
1164
1165         pnetwork_number = (unsigned long)((sendpacket[18] << 24) +
1166                           (sendpacket[19] << 16) + (sendpacket[20] << 8) +
1167                           sendpacket[21]);
1168
1169         if( !incoming ) {
1170                 //If the source network is ours, make it 0
1171                 if( pnetwork_number == network_number) {
1172                         sendpacket[18] = sendpacket[19] = sendpacket[20] =
1173                                          sendpacket[21] = 0x00;
1174                 }
1175         } else {
1176                 //If the source network is 0, make it ours
1177                 if( pnetwork_number == 0 ) {
1178                         sendpacket[18] = (unsigned char)(network_number >> 24);
1179                         sendpacket[19] = (unsigned char)((network_number &
1180                                          0x00FF0000) >> 16);
1181                         sendpacket[20] = (unsigned char)((network_number &
1182                                          0x0000FF00) >> 8);
1183                         sendpacket[21] = (unsigned char)(network_number &
1184                                          0x000000FF);
1185                 }
1186         }
1187 } /* switch_net_numbers */
1188
1189 /*============================================================================
1190  * Get ethernet-style interface statistics.
1191  * Return a pointer to struct net_device_stats.
1192  */
1193 static struct net_device_stats *if_stats(struct net_device *dev)
1194 {
1195
1196         ppp_private_area_t *ppp_priv_area = dev->priv;
1197         sdla_t* card;
1198
1199         if( ppp_priv_area == NULL )
1200                 return NULL;
1201
1202         card = ppp_priv_area->card;
1203         return &card->wandev.stats;
1204 }
1205
1206 /****** PPP Firmware Interface Functions ************************************/
1207
1208 /*============================================================================
1209  * Read firmware code version.
1210  *      Put code version as ASCII string in str.
1211  */
1212 static int ppp_read_version(sdla_t *card, char *str)
1213 {
1214         ppp_mbox_t *mb = card->mbox;
1215         int err;
1216
1217         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
1218         mb->cmd.command = PPP_READ_CODE_VERSION;
1219         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
1220
1221         if (err != CMD_OK)
1222
1223                 ppp_error(card, err, mb);
1224
1225         else if (str) {
1226
1227                 int len = mb->cmd.length;
1228
1229                 memcpy(str, mb->data, len);
1230                 str[len] = '\0';
1231
1232         }
1233
1234         return err;
1235 }
1236 /*===========================================================================
1237  * Set Out-Bound Authentication.
1238 */
1239 static int ppp_set_outbnd_auth (sdla_t *card, ppp_private_area_t *ppp_priv_area)
1240 {
1241         ppp_mbox_t *mb = card->mbox;
1242         int err;
1243
1244         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
1245         memset(&mb->data, 0, (strlen(ppp_priv_area->userid) +
1246                                         strlen(ppp_priv_area->passwd) + 2 ) );
1247         memcpy(mb->data, ppp_priv_area->userid, strlen(ppp_priv_area->userid));
1248         memcpy((mb->data + strlen(ppp_priv_area->userid) + 1),
1249                 ppp_priv_area->passwd, strlen(ppp_priv_area->passwd));
1250
1251         mb->cmd.length  = strlen(ppp_priv_area->userid) +
1252                                         strlen(ppp_priv_area->passwd) + 2 ;
1253
1254         mb->cmd.command = PPP_SET_OUTBOUND_AUTH;
1255
1256         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
1257
1258         if (err != CMD_OK)
1259                 ppp_error(card, err, mb);
1260
1261         return err;
1262 }
1263
1264 /*===========================================================================
1265  * Set In-Bound Authentication.
1266 */
1267 static int ppp_set_inbnd_auth (sdla_t *card, ppp_private_area_t *ppp_priv_area)
1268 {
1269         ppp_mbox_t *mb = card->mbox;
1270         int err, i;
1271         char* user_tokens[32];
1272         char* pass_tokens[32];
1273         int userids, passwds;
1274         int add_ptr;
1275
1276         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
1277         memset(&mb->data, 0, 1008);
1278         memcpy(mb->data, ppp_priv_area->sysname,
1279                                                 strlen(ppp_priv_area->sysname));
1280
1281         /* Parse the userid string and the password string and build a string
1282            to copy it to the data area of the command structure.   The string
1283            will look like "SYS_NAME<NULL>USER1<NULL>PASS1<NULL>USER2<NULL>PASS2
1284            ....<NULL> "
1285          */
1286         userids = tokenize( ppp_priv_area->userid, user_tokens);
1287         passwds = tokenize( ppp_priv_area->passwd, pass_tokens);
1288
1289         if (userids != passwds){
1290                 printk(KERN_INFO "%s: Number of passwords does not equal the number of user ids\n", card->devname);
1291                 return 1;
1292         }
1293
1294         add_ptr = strlen(ppp_priv_area->sysname) + 1;
1295         for (i=0; i<userids; i++){
1296                 memcpy((mb->data + add_ptr), user_tokens[i],
1297                                                         strlen(user_tokens[i]));
1298                 memcpy((mb->data + add_ptr + strlen(user_tokens[i]) + 1),
1299                                         pass_tokens[i], strlen(pass_tokens[i]));
1300                 add_ptr = add_ptr + strlen(user_tokens[i]) + 1 +
1301                                                 strlen(pass_tokens[i]) + 1;
1302         }
1303
1304         mb->cmd.length  = add_ptr + 1;
1305         mb->cmd.command = PPP_SET_INBOUND_AUTH;
1306
1307         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
1308
1309         if (err != CMD_OK)
1310                 ppp_error(card, err, mb);
1311
1312         return err;
1313 }
1314
1315
1316 /*============================================================================
1317  * Tokenize string.
1318  *      Parse a string of the following syntax:
1319  *              <arg1>,<arg2>,...
1320  *      and fill array of tokens with pointers to string elements.
1321  *
1322  */
1323 static int tokenize (char *str, char **tokens)
1324 {
1325         int cnt = 0;
1326
1327         tokens[0] = strsep(&str, "/");
1328         while (tokens[cnt] && (cnt < 32 - 1))
1329         {
1330                 tokens[cnt] = strstrip(tokens[cnt], " \t");
1331                 tokens[++cnt] = strsep(&str, "/");
1332         }
1333         return cnt;
1334 }
1335
1336 /*============================================================================
1337  * Strip leading and trailing spaces off the string str.
1338  */
1339 static char* strstrip (char *str, char* s)
1340 {
1341         char *eos = str + strlen(str);          /* -> end of string */
1342
1343         while (*str && strchr(s, *str))
1344                 ++str                           /* strip leading spaces */
1345         ;
1346         while ((eos > str) && strchr(s, *(eos - 1)))
1347                 --eos                           /* strip trailing spaces */
1348         ;
1349         *eos = '\0';
1350         return str;
1351 }
1352 /*============================================================================
1353  * Configure PPP firmware.
1354  */
1355 static int ppp_configure(sdla_t *card, void *data)
1356 {
1357         ppp_mbox_t *mb = card->mbox;
1358         int data_len = sizeof(ppp508_conf_t);
1359         int err;
1360
1361         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
1362         memcpy(mb->data, data, data_len);
1363         mb->cmd.length  = data_len;
1364         mb->cmd.command = PPP_SET_CONFIG;
1365         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
1366
1367         if (err != CMD_OK)
1368                 ppp_error(card, err, mb);
1369
1370         return err;
1371 }
1372
1373 /*============================================================================
1374  * Set interrupt mode.
1375  */
1376 static int ppp_set_intr_mode(sdla_t *card, unsigned char mode)
1377 {
1378         ppp_mbox_t *mb = card->mbox;
1379         ppp_intr_info_t *ppp_intr_data = (ppp_intr_info_t *) &mb->data[0];
1380         int err;
1381
1382         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
1383         ppp_intr_data->i_enable = mode;
1384
1385         ppp_intr_data->irq = card->hw.irq;
1386         mb->cmd.length = 2;
1387
1388        /* If timer has been enabled, set the timer delay to 1sec */
1389        if (mode & 0x80){
1390                 ppp_intr_data->timer_len = 250; //5;//100; //250;
1391                 mb->cmd.length = 4;
1392         }
1393
1394         mb->cmd.command = PPP_SET_INTR_FLAGS;
1395         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
1396
1397         if (err != CMD_OK)
1398                 ppp_error(card, err, mb);
1399
1400
1401         return err;
1402 }
1403
1404 /*============================================================================
1405  * Enable communications.
1406  */
1407 static int ppp_comm_enable(sdla_t *card)
1408 {
1409         ppp_mbox_t *mb = card->mbox;
1410         int err;
1411
1412         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
1413         mb->cmd.command = PPP_COMM_ENABLE;
1414         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
1415
1416         if (err != CMD_OK)
1417                 ppp_error(card, err, mb);
1418         else
1419                 card->u.p.comm_enabled = 1;
1420
1421         return err;
1422 }
1423
1424 /*============================================================================
1425  * Disable communications.
1426  */
1427 static int ppp_comm_disable(sdla_t *card)
1428 {
1429         ppp_mbox_t *mb = card->mbox;
1430         int err;
1431
1432         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
1433         mb->cmd.command = PPP_COMM_DISABLE;
1434         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
1435         if (err != CMD_OK)
1436                 ppp_error(card, err, mb);
1437         else
1438                 card->u.p.comm_enabled = 0;
1439
1440         return err;
1441 }
1442
1443 static int ppp_comm_disable_shutdown(sdla_t *card)
1444 {
1445         ppp_mbox_t *mb = card->mbox;
1446         ppp_intr_info_t *ppp_intr_data;
1447         int err;
1448
1449         if (!mb){
1450                 return 1;
1451         }
1452
1453         ppp_intr_data = (ppp_intr_info_t *) &mb->data[0];
1454
1455         /* Disable all interrupts */
1456         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
1457         ppp_intr_data->i_enable = 0;
1458
1459         ppp_intr_data->irq = card->hw.irq;
1460         mb->cmd.length = 2;
1461
1462         mb->cmd.command = PPP_SET_INTR_FLAGS;
1463         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
1464
1465         /* Disable communicatinons */
1466         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
1467         mb->cmd.command = PPP_COMM_DISABLE;
1468         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
1469
1470         card->u.p.comm_enabled = 0;
1471
1472         return 0;
1473 }
1474
1475
1476
1477 /*============================================================================
1478  * Get communications error statistics.
1479  */
1480 static int ppp_get_err_stats(sdla_t *card)
1481 {
1482         ppp_mbox_t *mb = card->mbox;
1483         int err;
1484
1485         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
1486         mb->cmd.command = PPP_READ_ERROR_STATS;
1487         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
1488
1489         if (err == CMD_OK) {
1490
1491                 ppp_err_stats_t* stats = (void*)mb->data;
1492                 card->wandev.stats.rx_over_errors    = stats->rx_overrun;
1493                 card->wandev.stats.rx_crc_errors     = stats->rx_bad_crc;
1494                 card->wandev.stats.rx_missed_errors  = stats->rx_abort;
1495                 card->wandev.stats.rx_length_errors  = stats->rx_lost;
1496                 card->wandev.stats.tx_aborted_errors = stats->tx_abort;
1497
1498         } else
1499                 ppp_error(card, err, mb);
1500
1501         return err;
1502 }
1503
1504 /*============================================================================
1505  * Send packet.
1506  *      Return: 0 - o.k.
1507  *              1 - no transmit buffers available
1508  */
1509 static int ppp_send (sdla_t *card, void *data, unsigned len, unsigned proto)
1510 {
1511         ppp_buf_ctl_t *txbuf = card->u.p.txbuf;
1512
1513         if (txbuf->flag)
1514                 return 1;
1515
1516         sdla_poke(&card->hw, txbuf->buf.ptr, data, len);
1517
1518         txbuf->length = len;            /* frame length */
1519
1520         if (proto == htons(ETH_P_IPX))
1521                 txbuf->proto = 0x01;    /* protocol ID */
1522         else
1523                 txbuf->proto = 0x00;    /* protocol ID */
1524
1525         txbuf->flag = 1;                /* start transmission */
1526
1527         /* Update transmit buffer control fields */
1528         card->u.p.txbuf = ++txbuf;
1529
1530         if ((void*)txbuf > card->u.p.txbuf_last)
1531                 card->u.p.txbuf = card->u.p.txbuf_base;
1532
1533         return 0;
1534 }
1535
1536 /****** Firmware Error Handler **********************************************/
1537
1538 /*============================================================================
1539  * Firmware error handler.
1540  *      This routine is called whenever firmware command returns non-zero
1541  *      return code.
1542  *
1543  * Return zero if previous command has to be cancelled.
1544  */
1545 static int ppp_error(sdla_t *card, int err, ppp_mbox_t *mb)
1546 {
1547         unsigned cmd = mb->cmd.command;
1548
1549         switch (err) {
1550
1551                 case CMD_TIMEOUT:
1552                         printk(KERN_ERR "%s: command 0x%02X timed out!\n",
1553                                 card->devname, cmd);
1554                         break;
1555
1556                 default:
1557                         printk(KERN_INFO "%s: command 0x%02X returned 0x%02X!\n"
1558                                 , card->devname, cmd, err);
1559         }
1560
1561         return 0;
1562 }
1563
1564 /****** Interrupt Handlers **************************************************/
1565
1566 /*============================================================================
1567  * PPP interrupt service routine.
1568  */
1569 static void wpp_isr (sdla_t *card)
1570 {
1571         ppp_flags_t *flags = card->flags;
1572         char *ptr = &flags->iflag;
1573         struct net_device *dev = card->wandev.dev;
1574         int i;
1575
1576         card->in_isr = 1;
1577         ++card->statistics.isr_entry;
1578
1579         if (!dev && flags->iflag != PPP_INTR_CMD){
1580                 card->in_isr = 0;
1581                 flags->iflag = 0;
1582                 return;
1583         }
1584
1585         if (test_bit(PERI_CRIT, (void*)&card->wandev.critical)) {
1586                 card->in_isr = 0;
1587                 flags->iflag = 0;
1588                 return;
1589         }
1590
1591
1592         if(card->hw.type != SDLA_S514){
1593                 if (test_bit(SEND_CRIT, (void*)&card->wandev.critical)) {
1594                         ++card->statistics.isr_already_critical;
1595                         printk (KERN_INFO "%s: Critical while in ISR!\n",
1596                                         card->devname);
1597                         card->in_isr = 0;
1598                         flags->iflag = 0;
1599                         return;
1600                 }
1601         }
1602
1603         switch (flags->iflag) {
1604
1605                 case PPP_INTR_RXRDY:    /* receive interrupt  0x01  (bit 0)*/
1606                         ++card->statistics.isr_rx;
1607                         rx_intr(card);
1608                         break;
1609
1610                 case PPP_INTR_TXRDY:    /* transmit interrupt  0x02 (bit 1)*/
1611                         ++card->statistics.isr_tx;
1612                         flags->imask &= ~PPP_INTR_TXRDY;
1613                         netif_wake_queue(dev);
1614                         break;
1615
1616                 case PPP_INTR_CMD:      /* interface command completed */
1617                         ++Intr_test_counter;
1618                         ++card->statistics.isr_intr_test;
1619                         break;
1620
1621                 case PPP_INTR_MODEM:    /* modem status change (DCD, CTS) 0x04 (bit 2)*/
1622                 case PPP_INTR_DISC:     /* Data link disconnected 0x10  (bit 4)*/
1623                 case PPP_INTR_OPEN:     /* Data link open 0x20  (bit 5)*/
1624                 case PPP_INTR_DROP_DTR: /* DTR drop timeout expired  0x40 bit 6 */
1625                         event_intr(card);
1626                         break;
1627
1628                 case PPP_INTR_TIMER:
1629                         timer_intr(card);
1630                         break;
1631
1632                 default:        /* unexpected interrupt */
1633                         ++card->statistics.isr_spurious;
1634                         printk(KERN_INFO "%s: spurious interrupt 0x%02X!\n",
1635                                 card->devname, flags->iflag);
1636                         printk(KERN_INFO "%s: ID Bytes = ",card->devname);
1637                         for(i = 0; i < 8; i ++)
1638                                 printk(KERN_INFO "0x%02X ", *(ptr + 0x28 + i));
1639                         printk(KERN_INFO "\n");
1640         }
1641
1642         card->in_isr = 0;
1643         flags->iflag = 0;
1644         return;
1645 }
1646
1647 /*============================================================================
1648  * Receive interrupt handler.
1649  */
1650 static void rx_intr(sdla_t *card)
1651 {
1652         ppp_buf_ctl_t *rxbuf = card->rxmb;
1653         struct net_device *dev = card->wandev.dev;
1654         ppp_private_area_t *ppp_priv_area;
1655         struct sk_buff *skb;
1656         unsigned len;
1657         void *buf;
1658         int i;
1659         ppp_flags_t *flags = card->flags;
1660         char *ptr = &flags->iflag;
1661         int udp_type;
1662
1663
1664         if (rxbuf->flag != 0x01) {
1665
1666                 printk(KERN_INFO
1667                         "%s: corrupted Rx buffer @ 0x%X, flag = 0x%02X!\n",
1668                         card->devname, (unsigned)rxbuf, rxbuf->flag);
1669
1670                 printk(KERN_INFO "%s: ID Bytes = ",card->devname);
1671
1672                 for(i = 0; i < 8; i ++)
1673                         printk(KERN_INFO "0x%02X ", *(ptr + 0x28 + i));
1674                 printk(KERN_INFO "\n");
1675
1676                 ++card->statistics.rx_intr_corrupt_rx_bfr;
1677
1678
1679                 /* Bug Fix: Mar 6 2000
1680                  * If we get a corrupted mailbox, it means that driver
1681                  * is out of sync with the firmware. There is no recovery.
1682                  * If we don't turn off all interrupts for this card
1683                  * the machine will crash.
1684                  */
1685                 printk(KERN_INFO "%s: Critical router failure ...!!!\n", card->devname);
1686                 printk(KERN_INFO "Please contact Sangoma Technologies !\n");
1687                 ppp_set_intr_mode(card,0);
1688                 return;
1689         }
1690
1691         if (dev && netif_running(dev) && dev->priv){
1692
1693                 len  = rxbuf->length;
1694                 ppp_priv_area = dev->priv;
1695
1696                 /* Allocate socket buffer */
1697                 skb = dev_alloc_skb(len);
1698
1699                 if (skb != NULL) {
1700
1701                         /* Copy data to the socket buffer */
1702                         unsigned addr = rxbuf->buf.ptr;
1703
1704                         if ((addr + len) > card->u.p.rx_top + 1) {
1705
1706                                 unsigned tmp = card->u.p.rx_top - addr + 1;
1707                                 buf = skb_put(skb, tmp);
1708                                 sdla_peek(&card->hw, addr, buf, tmp);
1709                                 addr = card->u.p.rx_base;
1710                                 len -= tmp;
1711                         }
1712                         buf = skb_put(skb, len);
1713                         sdla_peek(&card->hw, addr, buf, len);
1714
1715                         /* Decapsulate packet */
1716                         switch (rxbuf->proto) {
1717
1718                                 case 0x00:
1719                                         skb->protocol = htons(ETH_P_IP);
1720                                         break;
1721
1722                                 case 0x01:
1723                                         skb->protocol = htons(ETH_P_IPX);
1724                                         break;
1725                         }
1726
1727                         udp_type = udp_pkt_type( skb, card );
1728
1729                         if (udp_type == UDP_PTPIPE_TYPE){
1730
1731                                 /* Handle a UDP Request in Timer Interrupt */
1732                                 if(store_udp_mgmt_pkt(UDP_PKT_FRM_NETWORK, card, skb, dev,
1733                                                         ppp_priv_area)){
1734                                         flags->imask |= PPP_INTR_TIMER;
1735                                 }
1736                                 ++ppp_priv_area->rx_intr_stat.rx_intr_PIPE_request;
1737
1738
1739                         } else if (handle_IPXWAN(skb->data,card->devname,
1740                                                  ppp_priv_area->enable_IPX,
1741                                                  ppp_priv_area->network_number,
1742                                                  skb->protocol)) {
1743
1744                                 /* Handle an IPXWAN packet */
1745                                 if( ppp_priv_area->enable_IPX) {
1746
1747                                         /* Make sure we are not already sending */
1748                                         if (!test_bit(SEND_CRIT, &card->wandev.critical)){
1749                                                 ppp_send(card, skb->data, skb->len, htons(ETH_P_IPX));
1750                                         }
1751                                         dev_kfree_skb_any(skb);
1752
1753                                 } else {
1754                                         ++card->wandev.stats.rx_dropped;
1755                                 }
1756                         } else {
1757                                 /* Pass data up the protocol stack */
1758                                 skb->dev = dev;
1759                                 skb->mac.raw  = skb->data;
1760
1761                                 ++card->wandev.stats.rx_packets;
1762                                 card->wandev.stats.rx_bytes += skb->len;
1763                                 ++ppp_priv_area->rx_intr_stat.rx_intr_bfr_passed_to_stack;
1764                                 netif_rx(skb);
1765                                 dev->last_rx = jiffies;
1766                         }
1767
1768                 } else {
1769
1770                         if (net_ratelimit()){
1771                                 printk(KERN_INFO "%s: no socket buffers available!\n",
1772                                         card->devname);
1773                         }
1774                         ++card->wandev.stats.rx_dropped;
1775                         ++ppp_priv_area->rx_intr_stat.rx_intr_no_socket;
1776                 }
1777
1778         } else {
1779                 ++card->statistics.rx_intr_dev_not_started;
1780         }
1781
1782         /* Release buffer element and calculate a pointer to the next one */
1783         rxbuf->flag = 0x00;
1784         card->rxmb = ++rxbuf;
1785         if ((void*)rxbuf > card->u.p.rxbuf_last)
1786                 card->rxmb = card->u.p.rxbuf_base;
1787 }
1788
1789
1790 void event_intr (sdla_t *card)
1791 {
1792
1793         struct net_device* dev = card->wandev.dev;
1794         ppp_private_area_t* ppp_priv_area = dev->priv;
1795         volatile ppp_flags_t *flags = card->flags;
1796
1797         switch (flags->iflag){
1798
1799                 case PPP_INTR_MODEM:    /* modem status change (DCD, CTS) 0x04  (bit 2)*/
1800
1801                         if (net_ratelimit()){
1802                                 printk (KERN_INFO "%s: Modem status: DCD=%s CTS=%s\n",
1803                                         card->devname, DCD(flags->mstatus), CTS(flags->mstatus));
1804                         }
1805                         break;
1806
1807                 case PPP_INTR_DISC:     /* Data link disconnected 0x10  (bit 4)*/
1808
1809                         NEX_PRINTK (KERN_INFO "Data link disconnected intr Cause %X\n",
1810                                                flags->disc_cause);
1811
1812                         if (flags->disc_cause &
1813                                 (PPP_LOCAL_TERMINATION | PPP_DCD_CTS_DROP |
1814                                 PPP_REMOTE_TERMINATION)) {
1815
1816                                 if (card->u.p.ip_mode == WANOPT_PPP_PEER) {
1817                                         set_bit(0,&Read_connection_info);
1818                                 }
1819                                 wanpipe_set_state(card, WAN_DISCONNECTED);
1820
1821                                 show_disc_cause(card, flags->disc_cause);
1822                                 ppp_priv_area->timer_int_enabled |= TMR_INT_ENABLED_PPP_EVENT;
1823                                 flags->imask |= PPP_INTR_TIMER;
1824                                 trigger_ppp_poll(dev);
1825                         }
1826                         break;
1827
1828                 case PPP_INTR_OPEN:     /* Data link open 0x20  (bit 5)*/
1829
1830                         NEX_PRINTK (KERN_INFO "%s: PPP Link Open, LCP=%s IP=%s\n",
1831                                         card->devname,LCP(flags->lcp_state),
1832                                         IP(flags->ip_state));
1833
1834                         if (flags->lcp_state == 0x09 &&
1835                            (flags->ip_state == 0x09 || flags->ipx_state == 0x09)){
1836
1837                                 /* Initialize the polling timer and set the state
1838                                  * to WAN_CONNNECTED */
1839
1840
1841                                 /* BUG FIX: When the protocol restarts, during heavy
1842                                  * traffic, board tx buffers and driver tx buffers
1843                                  * can go out of sync.  This checks the condition
1844                                  * and if the tx buffers are out of sync, the
1845                                  * protocols are restarted.
1846                                  * I don't know why the board tx buffer is out
1847                                  * of sync. It could be that a packets is tx
1848                                  * while the link is down, but that is not
1849                                  * possible. The other possiblility is that the
1850                                  * firmware doesn't reinitialize properly.
1851                                  * FIXME: A better fix should be found.
1852                                  */
1853                                 if (detect_and_fix_tx_bug(card)){
1854
1855                                         ppp_comm_disable(card);
1856
1857                                         wanpipe_set_state(card, WAN_DISCONNECTED);
1858
1859                                         ppp_priv_area->timer_int_enabled |=
1860                                                 TMR_INT_ENABLED_PPP_EVENT;
1861                                         flags->imask |= PPP_INTR_TIMER;
1862                                         break;
1863                                 }
1864
1865                                 card->state_tick = jiffies;
1866                                 wanpipe_set_state(card, WAN_CONNECTED);
1867
1868                                 NEX_PRINTK(KERN_INFO "CON: L Tx: %lx  B Tx: %lx || L Rx %lx B Rx %lx\n",
1869                                         (unsigned long)card->u.p.txbuf, *card->u.p.txbuf_next,
1870                                         (unsigned long)card->rxmb, *card->u.p.rxbuf_next);
1871
1872                                 /* Tell timer interrupt that PPP event occurred */
1873                                 ppp_priv_area->timer_int_enabled |= TMR_INT_ENABLED_PPP_EVENT;
1874                                 flags->imask |= PPP_INTR_TIMER;
1875
1876                                 /* If we are in PEER mode, we must first obtain the
1877                                  * IP information and then go into the poll routine */
1878                                 if (card->u.p.ip_mode != WANOPT_PPP_PEER){
1879                                         trigger_ppp_poll(dev);
1880                                 }
1881                         }
1882                         break;
1883
1884                 case PPP_INTR_DROP_DTR:         /* DTR drop timeout expired  0x40 bit 6 */
1885
1886                         NEX_PRINTK(KERN_INFO "DTR Drop Timeout Interrrupt \n");
1887
1888                         if (card->u.p.ip_mode == WANOPT_PPP_PEER) {
1889                                 set_bit(0,&Read_connection_info);
1890                         }
1891
1892                         wanpipe_set_state(card, WAN_DISCONNECTED);
1893
1894                         show_disc_cause(card, flags->disc_cause);
1895                         ppp_priv_area->timer_int_enabled |= TMR_INT_ENABLED_PPP_EVENT;
1896                         flags->imask |= PPP_INTR_TIMER;
1897                         trigger_ppp_poll(dev);
1898                         break;
1899
1900                 default:
1901                         printk(KERN_INFO "%s: Error, Invalid PPP Event\n",card->devname);
1902         }
1903 }
1904
1905
1906
1907 /* TIMER INTERRUPT */
1908
1909 void timer_intr (sdla_t *card)
1910 {
1911
1912         struct net_device* dev = card->wandev.dev;
1913         ppp_private_area_t* ppp_priv_area = dev->priv;
1914         ppp_flags_t *flags = card->flags;
1915
1916
1917         if (ppp_priv_area->timer_int_enabled & TMR_INT_ENABLED_CONFIG){
1918                 if (!config_ppp(card)){
1919                         ppp_priv_area->timer_int_enabled &=
1920                                         ~TMR_INT_ENABLED_CONFIG;
1921                 }
1922         }
1923
1924         /* Update statistics */
1925         if (ppp_priv_area->timer_int_enabled & TMR_INT_ENABLED_UPDATE){
1926                 ppp_get_err_stats(card);
1927                 if(!(--ppp_priv_area->update_comms_stats)){
1928                         ppp_priv_area->timer_int_enabled &=
1929                                 ~TMR_INT_ENABLED_UPDATE;
1930                 }
1931         }
1932
1933         /* PPIPEMON UDP request */
1934
1935         if (ppp_priv_area->timer_int_enabled & TMR_INT_ENABLED_UDP){
1936                 process_udp_mgmt_pkt(card,dev, ppp_priv_area);
1937                 ppp_priv_area->timer_int_enabled &= ~TMR_INT_ENABLED_UDP;
1938         }
1939
1940         /* PPP Event */
1941         if (ppp_priv_area->timer_int_enabled & TMR_INT_ENABLED_PPP_EVENT){
1942
1943                 if (card->wandev.state == WAN_DISCONNECTED){
1944                         retrigger_comm(card);
1945                 }
1946
1947                 /* If the state is CONNECTING, it means that communicatins were
1948                  * enabled. When the remote side enables its comminication we
1949                  * should get an interrupt PPP_INTR_OPEN, thus turn off polling
1950                  */
1951
1952                 else if (card->wandev.state == WAN_CONNECTING){
1953                         /* Turn off the timer interrupt */
1954                         ppp_priv_area->timer_int_enabled &= ~TMR_INT_ENABLED_PPP_EVENT;
1955                 }
1956
1957                 /* If state is connected and we are in PEER mode
1958                  * poll for an IP address which will be provided by remote end.
1959                  */
1960                 else if ((card->wandev.state == WAN_CONNECTED &&
1961                           card->u.p.ip_mode == WANOPT_PPP_PEER) &&
1962                           test_bit(0,&Read_connection_info)){
1963
1964                         card->state_tick = jiffies;
1965                         if (read_connection_info (card)){
1966                                 printk(KERN_INFO "%s: Failed to read PEER IP Addresses\n",
1967                                         card->devname);
1968                         }else{
1969                                 clear_bit(0,&Read_connection_info);
1970                                 set_bit(1,&Read_connection_info);
1971                                 trigger_ppp_poll(dev);
1972                         }
1973                 }else{
1974                         //FIXME Put the comment back int
1975                         ppp_priv_area->timer_int_enabled &= ~TMR_INT_ENABLED_PPP_EVENT;
1976                 }
1977
1978         }/* End of PPP_EVENT */
1979
1980
1981         /* Only disable the timer interrupt if there are no udp, statistic */
1982         /* updates or events pending */
1983         if(!ppp_priv_area->timer_int_enabled) {
1984                 flags->imask &= ~PPP_INTR_TIMER;
1985         }
1986 }
1987
1988
1989 static int handle_IPXWAN(unsigned char *sendpacket, char *devname, unsigned char enable_IPX, unsigned long network_number, unsigned short proto)
1990 {
1991         int i;
1992
1993         if( proto == htons(ETH_P_IPX) ) {
1994                 //It's an IPX packet
1995                 if(!enable_IPX) {
1996                         //Return 1 so we don't pass it up the stack.
1997                         return 1;
1998                 }
1999         } else {
2000                 //It's not IPX so pass it up the stack.
2001                 return 0;
2002         }
2003
2004         if( sendpacket[16] == 0x90 &&
2005             sendpacket[17] == 0x04)
2006         {
2007                 //It's IPXWAN
2008
2009                 if( sendpacket[2] == 0x02 &&
2010                     sendpacket[34] == 0x00)
2011                 {
2012                         //It's a timer request packet
2013                         printk(KERN_INFO "%s: Received IPXWAN Timer Request packet\n",devname);
2014
2015                         //Go through the routing options and answer no to every
2016                         //option except Unnumbered RIP/SAP
2017                         for(i = 41; sendpacket[i] == 0x00; i += 5)
2018                         {
2019                                 //0x02 is the option for Unnumbered RIP/SAP
2020                                 if( sendpacket[i + 4] != 0x02)
2021                                 {
2022                                         sendpacket[i + 1] = 0;
2023                                 }
2024                         }
2025
2026                         //Skip over the extended Node ID option
2027                         if( sendpacket[i] == 0x04 )
2028                         {
2029                                 i += 8;
2030                         }
2031
2032                         //We also want to turn off all header compression opt.
2033                         for(; sendpacket[i] == 0x80 ;)
2034                         {
2035                                 sendpacket[i + 1] = 0;
2036                                 i += (sendpacket[i + 2] << 8) + (sendpacket[i + 3]) + 4;
2037                         }
2038
2039                         //Set the packet type to timer response
2040                         sendpacket[34] = 0x01;
2041
2042                         printk(KERN_INFO "%s: Sending IPXWAN Timer Response\n",devname);
2043                 }
2044                 else if( sendpacket[34] == 0x02 )
2045                 {
2046                         //This is an information request packet
2047                         printk(KERN_INFO "%s: Received IPXWAN Information Request packet\n",devname);
2048
2049                         //Set the packet type to information response
2050                         sendpacket[34] = 0x03;
2051
2052                         //Set the router name
2053                         sendpacket[51] = 'P';
2054                         sendpacket[52] = 'T';
2055                         sendpacket[53] = 'P';
2056                         sendpacket[54] = 'I';
2057                         sendpacket[55] = 'P';
2058                         sendpacket[56] = 'E';
2059                         sendpacket[57] = '-';
2060                         sendpacket[58] = CVHexToAscii(network_number >> 28);
2061                         sendpacket[59] = CVHexToAscii((network_number & 0x0F000000)>> 24);
2062                         sendpacket[60] = CVHexToAscii((network_number & 0x00F00000)>> 20);
2063                         sendpacket[61] = CVHexToAscii((network_number & 0x000F0000)>> 16);
2064                         sendpacket[62] = CVHexToAscii((network_number & 0x0000F000)>> 12);
2065                         sendpacket[63] = CVHexToAscii((network_number & 0x00000F00)>> 8);
2066                         sendpacket[64] = CVHexToAscii((network_number & 0x000000F0)>> 4);
2067                         sendpacket[65] = CVHexToAscii(network_number & 0x0000000F);
2068                         for(i = 66; i < 99; i+= 1)
2069                         {
2070                                 sendpacket[i] = 0;
2071                         }
2072
2073                         printk(KERN_INFO "%s: Sending IPXWAN Information Response packet\n",devname);
2074                 }
2075                 else
2076                 {
2077                         printk(KERN_INFO "%s: Unknown IPXWAN packet!\n",devname);
2078                         return 0;
2079                 }
2080
2081                 //Set the WNodeID to our network address
2082                 sendpacket[35] = (unsigned char)(network_number >> 24);
2083                 sendpacket[36] = (unsigned char)((network_number & 0x00FF0000) >> 16);
2084                 sendpacket[37] = (unsigned char)((network_number & 0x0000FF00) >> 8);
2085                 sendpacket[38] = (unsigned char)(network_number & 0x000000FF);
2086
2087                 return 1;
2088         } else {
2089                 //If we get here it's an IPX-data packet, so it'll get passed up the stack.
2090
2091                 //switch the network numbers
2092                 switch_net_numbers(sendpacket, network_number, 1);
2093                 return 0;
2094         }
2095 }
2096
2097 /****** Background Polling Routines  ****************************************/
2098
2099 /* All polling functions are invoked by the TIMER interrupt in the wpp_isr
2100  * routine.
2101  */
2102
2103 /*============================================================================
2104  * Monitor active link phase.
2105  */
2106 static void process_route (sdla_t *card)
2107 {
2108         ppp_flags_t *flags = card->flags;
2109         struct net_device *dev = card->wandev.dev;
2110         ppp_private_area_t *ppp_priv_area = dev->priv;
2111
2112         if ((card->u.p.ip_mode == WANOPT_PPP_PEER) &&
2113             (flags->ip_state == 0x09)){
2114
2115                 /* We get ip_local from the firmware in PEER mode.
2116                  * Therefore, if ip_local is 0, we failed to obtain
2117                  * the remote IP address. */
2118                 if (ppp_priv_area->ip_local == 0)
2119                         return;
2120
2121                 printk(KERN_INFO "%s: IPCP State Opened.\n", card->devname);
2122                 if (read_info( card )) {
2123                         printk(KERN_INFO
2124                                 "%s: An error occurred in IP assignment.\n",
2125                                 card->devname);
2126                 } else {
2127                         struct in_device *in_dev = dev->ip_ptr;
2128                         if (in_dev != NULL ) {
2129                                 struct in_ifaddr *ifa = in_dev->ifa_list;
2130
2131                                 printk(KERN_INFO "%s: Assigned Lcl. Addr: %u.%u.%u.%u\n",
2132                                         card->devname, NIPQUAD(ifa->ifa_local));
2133                                 printk(KERN_INFO "%s: Assigned Rmt. Addr: %u.%u.%u.%u\n",
2134                                                 card->devname, NIPQUAD(ifa->ifa_address));
2135                         }else{
2136                                 printk(KERN_INFO
2137                                 "%s: Error: Failed to add a route for PPP interface %s\n",
2138                                         card->devname,dev->name);
2139                         }
2140                 }
2141         }
2142 }
2143
2144 /*============================================================================
2145  * Monitor physical link disconnected phase.
2146  *  o if interface is up and the hold-down timeout has expired, then retry
2147  *    connection.
2148  */
2149 static void retrigger_comm(sdla_t *card)
2150 {
2151         struct net_device *dev = card->wandev.dev;
2152
2153         if (dev && ((jiffies - card->state_tick) > HOLD_DOWN_TIME)) {
2154
2155                 wanpipe_set_state(card, WAN_CONNECTING);
2156
2157                 if(ppp_comm_enable(card) == CMD_OK){
2158                         init_ppp_tx_rx_buff( card );
2159                 }
2160         }
2161 }
2162
2163 /****** Miscellaneous Functions *********************************************/
2164
2165 /*============================================================================
2166  * Configure S508 adapter.
2167  */
2168 static int config508(struct net_device *dev, sdla_t *card)
2169 {
2170         ppp508_conf_t cfg;
2171         struct in_device *in_dev = dev->ip_ptr;
2172         ppp_private_area_t *ppp_priv_area = dev->priv;
2173
2174         /* Prepare PPP configuration structure */
2175         memset(&cfg, 0, sizeof(ppp508_conf_t));
2176
2177         if (card->wandev.clocking)
2178                 cfg.line_speed = card->wandev.bps;
2179
2180         if (card->wandev.interface == WANOPT_RS232)
2181                 cfg.conf_flags |= INTERFACE_LEVEL_RS232;
2182
2183
2184         cfg.conf_flags  |= DONT_TERMINATE_LNK_MAX_CONFIG; /*send Configure-Request packets forever*/
2185         cfg.txbuf_percent       = PERCENT_TX_BUFF;      /* % of Tx bufs */
2186         cfg.mtu_local           = card->wandev.mtu;
2187         cfg.mtu_remote          = card->wandev.mtu;                  /*    Default   */
2188         cfg.restart_tmr         = TIME_BETWEEN_CONF_REQ;             /*    30 = 3sec */
2189         cfg.auth_rsrt_tmr       = TIME_BETWEEN_PAP_CHAP_REQ;         /*    30 = 3sec */
2190         cfg.auth_wait_tmr       = WAIT_PAP_CHAP_WITHOUT_REPLY;       /*   300 = 30s  */
2191         cfg.mdm_fail_tmr        = WAIT_AFTER_DCD_CTS_LOW;            /*     5 = 0.5s */
2192         cfg.dtr_drop_tmr        = TIME_DCD_CTS_LOW_AFTER_LNK_DOWN;   /*    10 = 1s   */
2193         cfg.connect_tmout       = WAIT_DCD_HIGH_AFTER_ENABLE_COMM;   /*   900 = 90s  */
2194         cfg.conf_retry          = MAX_CONF_REQ_WITHOUT_REPLY;        /*    10 = 1s   */
2195         cfg.term_retry          = MAX_TERM_REQ_WITHOUT_REPLY;        /*     2 times  */
2196         cfg.fail_retry          = NUM_CONF_NAK_WITHOUT_REPLY;        /*     5 times  */
2197         cfg.auth_retry          = NUM_AUTH_REQ_WITHOUT_REPLY;        /*     10 times */
2198
2199
2200         if( !card->u.p.authenticator ) {
2201                 printk(KERN_INFO "%s: Device is not configured as an authenticator\n",
2202                                 card->devname);
2203                 cfg.auth_options = NO_AUTHENTICATION;
2204         }else{
2205                 printk(KERN_INFO "%s: Device is configured as an authenticator\n",
2206                                 card->devname);
2207                 cfg.auth_options = INBOUND_AUTH;
2208         }
2209
2210         if( ppp_priv_area->pap == WANOPT_YES){
2211                 cfg.auth_options |=PAP_AUTH;
2212                 printk(KERN_INFO "%s: Pap enabled\n", card->devname);
2213         }
2214         if( ppp_priv_area->chap == WANOPT_YES){
2215                 cfg.auth_options |= CHAP_AUTH;
2216                 printk(KERN_INFO "%s: Chap enabled\n", card->devname);
2217         }
2218
2219
2220         if (ppp_priv_area->enable_IPX == WANOPT_YES){
2221                 printk(KERN_INFO "%s: Enabling IPX Protocol\n",card->devname);
2222                 cfg.ipx_options         = ENABLE_IPX | ROUTING_PROT_DEFAULT;
2223         }else{
2224                 cfg.ipx_options         = DISABLE_IPX;
2225         }
2226
2227         switch (card->u.p.ip_mode) {
2228
2229                 case WANOPT_PPP_STATIC:
2230
2231                         printk(KERN_INFO "%s: PPP IP Mode: STATIC\n",card->devname);
2232                         cfg.ip_options          = L_AND_R_IP_NO_ASSIG |
2233                                                             ENABLE_IP;
2234                         cfg.ip_local            = in_dev->ifa_list->ifa_local;
2235                         cfg.ip_remote           = in_dev->ifa_list->ifa_address;
2236                         /* Debugging code used to check that IP addresses
2237                          * obtained from the kernel are correct */
2238
2239                         NEX_PRINTK(KERN_INFO "Local %u.%u.%u.%u Remote %u.%u.%u.%u Name %s\n",
2240                                         NIPQUAD(ip_local),NIPQUAD(ip_remote), dev->name);
2241                         break;
2242
2243                 case WANOPT_PPP_HOST:
2244
2245                         printk(KERN_INFO "%s: PPP IP Mode: HOST\n",card->devname);
2246                         cfg.ip_options          = L_IP_LOCAL_ASSIG |
2247                                                   R_IP_LOCAL_ASSIG |
2248                                                   ENABLE_IP;
2249                         cfg.ip_local            = in_dev->ifa_list->ifa_local;
2250                         cfg.ip_remote           = in_dev->ifa_list->ifa_address;
2251                         /* Debugging code used to check that IP addresses
2252                          * obtained from the kernel are correct */
2253                         NEX_PRINTK (KERN_INFO "Local %u.%u.%u.%u Remote %u.%u.%u.%u Name %s\n",
2254                                         NIPQUAD(ip_local),NIPQUAD(ip_remote), dev->name);
2255
2256                         break;
2257
2258                 case WANOPT_PPP_PEER:
2259
2260                         printk(KERN_INFO "%s: PPP IP Mode: PEER\n",card->devname);
2261                         cfg.ip_options          = L_IP_REMOTE_ASSIG |
2262                                                   R_IP_REMOTE_ASSIG |
2263                                                           ENABLE_IP;
2264                         cfg.ip_local            = 0x00;
2265                         cfg.ip_remote           = 0x00;
2266                         break;
2267
2268                 default:
2269                         printk(KERN_INFO "%s: ERROR: Unsupported PPP Mode Selected\n",
2270                                         card->devname);
2271                         printk(KERN_INFO "%s:        PPP IP Modes: STATIC, PEER or HOST\n",
2272                                         card->devname);
2273                         return 1;
2274         }
2275
2276         return ppp_configure(card, &cfg);
2277 }
2278
2279 /*============================================================================
2280  * Show disconnection cause.
2281  */
2282 static void show_disc_cause(sdla_t *card, unsigned cause)
2283 {
2284         if (cause & 0x0802)
2285
2286                 printk(KERN_INFO "%s: link terminated by peer\n",
2287                         card->devname);
2288
2289         else if (cause & 0x0004)
2290
2291                 printk(KERN_INFO "%s: link terminated by user\n",
2292                         card->devname);
2293
2294         else if (cause & 0x0008)
2295
2296                 printk(KERN_INFO "%s: authentication failed\n", card->devname);
2297
2298         else if (cause & 0x0010)
2299
2300                 printk(KERN_INFO
2301                         "%s: authentication protocol negotiation failed\n",
2302                         card->devname);
2303
2304         else if (cause & 0x0020)
2305
2306                 printk(KERN_INFO
2307                 "%s: peer's request for authentication rejected\n",
2308                 card->devname);
2309
2310         else if (cause & 0x0040)
2311
2312                 printk(KERN_INFO "%s: MRU option rejected by peer\n",
2313                 card->devname);
2314
2315         else if (cause & 0x0080)
2316
2317                 printk(KERN_INFO "%s: peer's MRU was too small\n",
2318                 card->devname);
2319
2320         else if (cause & 0x0100)
2321
2322                 printk(KERN_INFO "%s: failed to negotiate peer's LCP options\n",
2323                 card->devname);
2324
2325         else if (cause & 0x0200)
2326
2327                 printk(KERN_INFO "%s: failed to negotiate peer's IPCP options\n"
2328                 , card->devname);
2329
2330         else if (cause & 0x0400)
2331
2332                 printk(KERN_INFO
2333                         "%s: failed to negotiate peer's IPXCP options\n",
2334                         card->devname);
2335 }
2336
2337 /*=============================================================================
2338  * Process UDP call of type PTPIPEAB.
2339  */
2340 static void process_udp_mgmt_pkt(sdla_t *card, struct net_device *dev,
2341                                  ppp_private_area_t *ppp_priv_area )
2342 {
2343         unsigned char buf2[5];
2344         unsigned char *buf;
2345         unsigned int frames, len;
2346         struct sk_buff *new_skb;
2347         unsigned short data_length, buffer_length, real_len;
2348         unsigned long data_ptr;
2349         int udp_mgmt_req_valid = 1;
2350         ppp_mbox_t *mbox = card->mbox;
2351         struct timeval tv;
2352         int err;
2353         ppp_udp_pkt_t *ppp_udp_pkt = (ppp_udp_pkt_t*)&ppp_priv_area->udp_pkt_data;
2354
2355         memcpy(&buf2, &card->wandev.udp_port, 2 );
2356
2357
2358         if(ppp_priv_area->udp_pkt_src == UDP_PKT_FRM_NETWORK) {
2359
2360                 switch(ppp_udp_pkt->cblock.command) {
2361
2362                         case PPIPE_GET_IBA_DATA:
2363                         case PPP_READ_CONFIG:
2364                         case PPP_GET_CONNECTION_INFO:
2365                         case PPIPE_ROUTER_UP_TIME:
2366                         case PPP_READ_STATISTICS:
2367                         case PPP_READ_ERROR_STATS:
2368                         case PPP_READ_PACKET_STATS:
2369                         case PPP_READ_LCP_STATS:
2370                         case PPP_READ_IPCP_STATS:
2371                         case PPP_READ_IPXCP_STATS:
2372                         case PPP_READ_PAP_STATS:
2373                         case PPP_READ_CHAP_STATS:
2374                         case PPP_READ_CODE_VERSION:
2375                                 udp_mgmt_req_valid = 1;
2376                                 break;
2377
2378                         default:
2379                                 udp_mgmt_req_valid = 0;
2380                                 break;
2381                 }
2382         }
2383
2384         if(!udp_mgmt_req_valid) {
2385
2386                 /* set length to 0 */
2387                 ppp_udp_pkt->cblock.length = 0x00;
2388
2389                 /* set return code */
2390                 ppp_udp_pkt->cblock.result = 0xCD;
2391                 ++ppp_priv_area->pipe_mgmt_stat.UDP_PIPE_mgmt_direction_err;
2392
2393                 if (net_ratelimit()){
2394                         printk(KERN_INFO
2395                         "%s: Warning, Illegal UDP command attempted from network: %x\n",
2396                         card->devname,ppp_udp_pkt->cblock.command);
2397                 }
2398         } else {
2399                 /* Initialize the trace element */
2400                 trace_element_t trace_element;
2401
2402                 switch (ppp_udp_pkt->cblock.command){
2403
2404                 /* PPIPE_ENABLE_TRACING */
2405                 case PPIPE_ENABLE_TRACING:
2406                         if (!card->TracingEnabled) {
2407
2408                                 /* OPERATE_DATALINE_MONITOR */
2409                                 mbox->cmd.command = PPP_DATALINE_MONITOR;
2410                                 mbox->cmd.length = 0x01;
2411                                 mbox->data[0] = ppp_udp_pkt->data[0];
2412                                 err = sdla_exec(mbox) ?
2413                                         mbox->cmd.result : CMD_TIMEOUT;
2414
2415                                 if (err != CMD_OK) {
2416
2417                                         ppp_error(card, err, mbox);
2418                                         card->TracingEnabled = 0;
2419
2420                                         /* set the return code */
2421
2422                                         ppp_udp_pkt->cblock.result = mbox->cmd.result;
2423                                         mbox->cmd.length = 0;
2424                                         break;
2425                                 }
2426
2427                                 sdla_peek(&card->hw, 0xC000, &buf2, 2);
2428
2429                                 ppp_priv_area->curr_trace_addr = 0;
2430                                 memcpy(&ppp_priv_area->curr_trace_addr, &buf2, 2);
2431                                 ppp_priv_area->start_trace_addr =
2432                                                 ppp_priv_area->curr_trace_addr;
2433                                 ppp_priv_area->end_trace_addr =
2434                                         ppp_priv_area->start_trace_addr + END_OFFSET;
2435
2436                                 /* MAX_SEND_BUFFER_SIZE - 28 (IP header)
2437                                    - 32 (ppipemon CBLOCK) */
2438                                 available_buffer_space = MAX_LGTH_UDP_MGNT_PKT -
2439                                                          sizeof(ip_pkt_t)-
2440                                                          sizeof(udp_pkt_t)-
2441                                                          sizeof(wp_mgmt_t)-
2442                                                          sizeof(cblock_t);
2443                         }
2444                         ppp_udp_pkt->cblock.result = 0;
2445                         mbox->cmd.length = 0;
2446                         card->TracingEnabled = 1;
2447                         break;
2448
2449                 /* PPIPE_DISABLE_TRACING */
2450                 case PPIPE_DISABLE_TRACING:
2451
2452                         if(card->TracingEnabled) {
2453
2454                                 /* OPERATE_DATALINE_MONITOR */
2455                                 mbox->cmd.command = 0x33;
2456                                 mbox->cmd.length = 1;
2457                                 mbox->data[0] = 0x00;
2458                                 err = sdla_exec(mbox) ?
2459                                         mbox->cmd.result : CMD_TIMEOUT;
2460
2461                         }
2462
2463                         /*set return code*/
2464                         ppp_udp_pkt->cblock.result = 0;
2465                         mbox->cmd.length = 0;
2466                         card->TracingEnabled = 0;
2467                         break;
2468
2469                 /* PPIPE_GET_TRACE_INFO */
2470                 case PPIPE_GET_TRACE_INFO:
2471
2472                         if(!card->TracingEnabled) {
2473                                 /* set return code */
2474                                 ppp_udp_pkt->cblock.result = 1;
2475                                 mbox->cmd.length = 0;
2476                         }
2477
2478                         buffer_length = 0;
2479
2480                         /* frames < 62, where 62 is the number of trace
2481                            information elements.  There is in total 496
2482                            bytes of space and each trace information
2483                            element is 8 bytes.
2484                          */
2485                         for ( frames=0; frames<62; frames++) {
2486
2487                                 trace_pkt_t *trace_pkt = (trace_pkt_t *)
2488                                         &ppp_udp_pkt->data[buffer_length];
2489
2490                                 /* Read the whole trace packet */
2491                                 sdla_peek(&card->hw, ppp_priv_area->curr_trace_addr,
2492                                           &trace_element, sizeof(trace_element_t));
2493
2494                                 /* no data on board so exit */
2495                                 if( trace_element.opp_flag == 0x00 )
2496                                         break;
2497
2498                                 data_ptr = trace_element.trace_data_ptr;
2499
2500                                 /* See if there is actual data on the trace buffer */
2501                                 if (data_ptr){
2502                                         data_length = trace_element.trace_length;
2503                                 }else{
2504                                         data_length = 0;
2505                                         ppp_udp_pkt->data[0] |= 0x02;
2506                                 }
2507
2508                                 //FIXME: Do we need this check
2509                                 if ((available_buffer_space - buffer_length)
2510                                      < (sizeof(trace_element_t)+1)){
2511
2512                                         /*indicate we have more frames
2513                                          * on board and exit
2514                                          */
2515                                         ppp_udp_pkt->data[0] |= 0x02;
2516                                         break;
2517                                 }
2518
2519                                 trace_pkt->status = trace_element.trace_type;
2520                                 trace_pkt->time_stamp = trace_element.trace_time_stamp;
2521                                 trace_pkt->real_length = trace_element.trace_length;
2522
2523                                 real_len = trace_element.trace_length;
2524
2525                                 if(data_ptr == 0){
2526                                         trace_pkt->data_avail = 0x00;
2527                                 }else{
2528                                         /* we can take it next time */
2529                                         if ((available_buffer_space - buffer_length)<
2530                                                 (real_len + sizeof(trace_pkt_t))){
2531
2532                                                 ppp_udp_pkt->data[0] |= 0x02;
2533                                                 break;
2534                                         }
2535                                         trace_pkt->data_avail = 0x01;
2536
2537                                         /* get the data */
2538                                         sdla_peek(&card->hw, data_ptr,
2539                                                   &trace_pkt->data,
2540                                                   real_len);
2541                                 }
2542                                 /* zero the opp flag to
2543                                    show we got the frame */
2544                                 buf2[0] = 0x00;
2545                                 sdla_poke(&card->hw, ppp_priv_area->curr_trace_addr,
2546                                           &buf2, 1);
2547
2548                                 /* now move onto the next
2549                                    frame */
2550                                 ppp_priv_area->curr_trace_addr += 8;
2551
2552                                 /* check if we passed the last address */
2553                                 if ( ppp_priv_area->curr_trace_addr >=
2554                                         ppp_priv_area->end_trace_addr){
2555
2556                                         ppp_priv_area->curr_trace_addr =
2557                                                 ppp_priv_area->start_trace_addr;
2558                                 }
2559
2560                                 /* update buffer length and make sure its even */
2561
2562                                 if ( trace_pkt->data_avail == 0x01 ) {
2563                                         buffer_length += real_len - 1;
2564                                 }
2565
2566                                 /* for the header */
2567                                 buffer_length += 8;
2568
2569                                 if( buffer_length & 0x0001 )
2570                                         buffer_length += 1;
2571                         }
2572
2573                         /* ok now set the total number of frames passed
2574                            in the high 5 bits */
2575                         ppp_udp_pkt->data[0] |= (frames << 2);
2576
2577                         /* set the data length */
2578                         mbox->cmd.length = buffer_length;
2579                         ppp_udp_pkt->cblock.length = buffer_length;
2580
2581                         /* set return code */
2582                         ppp_udp_pkt->cblock.result = 0;
2583                         break;
2584
2585                 /* PPIPE_GET_IBA_DATA */
2586                 case PPIPE_GET_IBA_DATA:
2587
2588                         mbox->cmd.length = 0x09;
2589
2590                         sdla_peek(&card->hw, 0xF003, &ppp_udp_pkt->data,
2591                                         mbox->cmd.length);
2592
2593                         /* set the length of the data */
2594                         ppp_udp_pkt->cblock.length = 0x09;
2595
2596                         /* set return code */
2597                         ppp_udp_pkt->cblock.result = 0x00;
2598                         ppp_udp_pkt->cblock.result = 0;
2599                         break;
2600
2601                 /* PPIPE_FT1_READ_STATUS */
2602                 case PPIPE_FT1_READ_STATUS:
2603                         sdla_peek(&card->hw, 0xF020, &ppp_udp_pkt->data[0], 2);
2604                         ppp_udp_pkt->cblock.length = mbox->cmd.length = 2;
2605                         ppp_udp_pkt->cblock.result = 0;
2606                         break;
2607
2608                 case PPIPE_FLUSH_DRIVER_STATS:
2609                         init_ppp_priv_struct( ppp_priv_area );
2610                         init_global_statistics( card );
2611                         mbox->cmd.length = 0;
2612                         ppp_udp_pkt->cblock.result = 0;
2613                         break;
2614
2615
2616                 case PPIPE_ROUTER_UP_TIME:
2617
2618                         do_gettimeofday( &tv );
2619                         ppp_priv_area->router_up_time = tv.tv_sec -
2620                                         ppp_priv_area->router_start_time;
2621                         *(unsigned long *)&ppp_udp_pkt->data = ppp_priv_area->router_up_time;
2622                         mbox->cmd.length = 4;
2623                         ppp_udp_pkt->cblock.result = 0;
2624                         break;
2625
2626                                 /* PPIPE_DRIVER_STATISTICS */
2627                 case PPIPE_DRIVER_STAT_IFSEND:
2628                         memcpy(&ppp_udp_pkt->data, &ppp_priv_area->if_send_stat,
2629                                 sizeof(if_send_stat_t));
2630
2631
2632                         ppp_udp_pkt->cblock.result = 0;
2633                         ppp_udp_pkt->cblock.length = sizeof(if_send_stat_t);
2634                         mbox->cmd.length = sizeof(if_send_stat_t);
2635                         break;
2636
2637                 case PPIPE_DRIVER_STAT_INTR:
2638                         memcpy(&ppp_udp_pkt->data, &card->statistics,
2639                                 sizeof(global_stats_t));
2640
2641                         memcpy(&ppp_udp_pkt->data+sizeof(global_stats_t),
2642                                 &ppp_priv_area->rx_intr_stat,
2643                                 sizeof(rx_intr_stat_t));
2644
2645                         ppp_udp_pkt->cblock.result = 0;
2646                         ppp_udp_pkt->cblock.length = sizeof(global_stats_t)+
2647                                                      sizeof(rx_intr_stat_t);
2648                         mbox->cmd.length = ppp_udp_pkt->cblock.length;
2649                         break;
2650
2651                 case PPIPE_DRIVER_STAT_GEN:
2652                         memcpy( &ppp_udp_pkt->data,
2653                                 &ppp_priv_area->pipe_mgmt_stat,
2654                                 sizeof(pipe_mgmt_stat_t));
2655
2656                         memcpy(&ppp_udp_pkt->data+sizeof(pipe_mgmt_stat_t),
2657                                &card->statistics, sizeof(global_stats_t));
2658
2659                         ppp_udp_pkt->cblock.result = 0;
2660                         ppp_udp_pkt->cblock.length = sizeof(global_stats_t)+
2661                                                      sizeof(rx_intr_stat_t);
2662                         mbox->cmd.length = ppp_udp_pkt->cblock.length;
2663                         break;
2664
2665
2666                 /* FT1 MONITOR STATUS */
2667                 case FT1_MONITOR_STATUS_CTRL:
2668
2669                         /* Enable FT1 MONITOR STATUS */
2670                         if( ppp_udp_pkt->data[0] == 1) {
2671
2672                                 if( rCount++ != 0 ) {
2673                                         ppp_udp_pkt->cblock.result = 0;
2674                                         mbox->cmd.length = 1;
2675                                         break;
2676                                 }
2677                         }
2678
2679                         /* Disable FT1 MONITOR STATUS */
2680                         if( ppp_udp_pkt->data[0] == 0) {
2681
2682                                 if( --rCount != 0) {
2683                                         ppp_udp_pkt->cblock.result = 0;
2684                                         mbox->cmd.length = 1;
2685                                         break;
2686                                 }
2687                         }
2688                         goto udp_dflt_cmd;
2689
2690                 /* WARNING: FIXME: This should be fixed.
2691                  * The FT1 Status Ctrl doesn't have a break
2692                  * statment.  Thus, no code must be inserted
2693                  * HERE: between default and above case statement */
2694
2695                 default:
2696 udp_dflt_cmd:
2697
2698                         /* it's a board command */
2699                         mbox->cmd.command = ppp_udp_pkt->cblock.command;
2700                         mbox->cmd.length = ppp_udp_pkt->cblock.length;
2701
2702                         if(mbox->cmd.length) {
2703                                 memcpy(&mbox->data,(unsigned char *)ppp_udp_pkt->data,
2704                                        mbox->cmd.length);
2705                         }
2706
2707                         /* run the command on the board */
2708                         err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
2709
2710                         if (err != CMD_OK) {
2711
2712                                 ppp_error(card, err, mbox);
2713                                 ++ppp_priv_area->pipe_mgmt_stat.
2714                                          UDP_PIPE_mgmt_adptr_cmnd_timeout;
2715                                 break;
2716                         }
2717
2718                         ++ppp_priv_area->pipe_mgmt_stat.UDP_PIPE_mgmt_adptr_cmnd_OK;
2719
2720                         /* copy the result back to our buffer */
2721                         memcpy(&ppp_udp_pkt->cblock,mbox, sizeof(cblock_t));
2722
2723                         if(mbox->cmd.length) {
2724                                 memcpy(&ppp_udp_pkt->data,&mbox->data,mbox->cmd.length);
2725                         }
2726
2727                 } /* end of switch */
2728         } /* end of else */
2729
2730         /* Fill UDP TTL */
2731         ppp_udp_pkt->ip_pkt.ttl = card->wandev.ttl;
2732         len = reply_udp(ppp_priv_area->udp_pkt_data, mbox->cmd.length);
2733
2734         if (ppp_priv_area->udp_pkt_src == UDP_PKT_FRM_NETWORK) {
2735
2736                 /* Make sure we are not already sending */
2737                 if (!test_bit(SEND_CRIT,&card->wandev.critical)){
2738                         ++ppp_priv_area->pipe_mgmt_stat.UDP_PIPE_mgmt_passed_to_adptr;
2739                         ppp_send(card,ppp_priv_area->udp_pkt_data,len,ppp_priv_area->protocol);
2740                 }
2741
2742         } else {
2743
2744                 /* Pass it up the stack
2745                    Allocate socket buffer */
2746                 if ((new_skb = dev_alloc_skb(len)) != NULL) {
2747
2748                         /* copy data into new_skb */
2749
2750                         buf = skb_put(new_skb, len);
2751                         memcpy(buf,ppp_priv_area->udp_pkt_data, len);
2752
2753                         ++ppp_priv_area->pipe_mgmt_stat.UDP_PIPE_mgmt_passed_to_stack;
2754
2755                         /* Decapsulate packet and pass it up the protocol
2756                            stack */
2757                         new_skb->protocol = htons(ETH_P_IP);
2758                         new_skb->dev = dev;
2759                         new_skb->mac.raw  = new_skb->data;
2760                         netif_rx(new_skb);
2761                         dev->last_rx = jiffies;
2762
2763                 } else {
2764
2765                         ++ppp_priv_area->pipe_mgmt_stat.UDP_PIPE_mgmt_no_socket;
2766                         printk(KERN_INFO "no socket buffers available!\n");
2767                 }
2768         }
2769
2770         ppp_priv_area->udp_pkt_lgth = 0;
2771
2772         return;
2773 }
2774
2775 /*=============================================================================
2776  * Initial the ppp_private_area structure.
2777  */
2778 static void init_ppp_priv_struct( ppp_private_area_t *ppp_priv_area )
2779 {
2780
2781         memset(&ppp_priv_area->if_send_stat, 0, sizeof(if_send_stat_t));
2782         memset(&ppp_priv_area->rx_intr_stat, 0, sizeof(rx_intr_stat_t));
2783         memset(&ppp_priv_area->pipe_mgmt_stat, 0, sizeof(pipe_mgmt_stat_t));
2784 }
2785
2786 /*============================================================================
2787  * Initialize Global Statistics
2788  */
2789 static void init_global_statistics( sdla_t *card )
2790 {
2791         memset(&card->statistics, 0, sizeof(global_stats_t));
2792 }
2793
2794 /*============================================================================
2795  * Initialize Receive and Transmit Buffers.
2796  */
2797 static void init_ppp_tx_rx_buff( sdla_t *card )
2798 {
2799         ppp508_buf_info_t* info;
2800
2801         if (card->hw.type == SDLA_S514) {
2802
2803                 info = (void*)(card->hw.dpmbase + PPP514_BUF_OFFS);
2804
2805                 card->u.p.txbuf_base = (void*)(card->hw.dpmbase +
2806                         info->txb_ptr);
2807
2808                 card->u.p.txbuf_last = (ppp_buf_ctl_t*)card->u.p.txbuf_base +
2809                         (info->txb_num - 1);
2810
2811                 card->u.p.rxbuf_base = (void*)(card->hw.dpmbase +
2812                         info->rxb_ptr);
2813
2814                 card->u.p.rxbuf_last = (ppp_buf_ctl_t*)card->u.p.rxbuf_base +
2815                         (info->rxb_num - 1);
2816
2817         } else {
2818
2819                 info = (void*)(card->hw.dpmbase + PPP508_BUF_OFFS);
2820
2821                 card->u.p.txbuf_base = (void*)(card->hw.dpmbase +
2822                         (info->txb_ptr - PPP508_MB_VECT));
2823
2824                 card->u.p.txbuf_last = (ppp_buf_ctl_t*)card->u.p.txbuf_base +
2825                         (info->txb_num - 1);
2826
2827                 card->u.p.rxbuf_base = (void*)(card->hw.dpmbase +
2828                         (info->rxb_ptr - PPP508_MB_VECT));
2829
2830                 card->u.p.rxbuf_last = (ppp_buf_ctl_t*)card->u.p.rxbuf_base +
2831                         (info->rxb_num - 1);
2832         }
2833
2834         card->u.p.txbuf_next = (unsigned long*)&info->txb_nxt;
2835         card->u.p.rxbuf_next = (unsigned long*)&info->rxb1_ptr;
2836
2837         card->u.p.rx_base = info->rxb_base;
2838         card->u.p.rx_top  = info->rxb_end;
2839
2840         card->u.p.txbuf = card->u.p.txbuf_base;
2841         card->rxmb = card->u.p.rxbuf_base;
2842
2843 }
2844
2845 /*=============================================================================
2846  * Read Connection Information (ie for Remote IP address assginment).
2847  * Called when ppp interface connected.
2848  */
2849 static int read_info( sdla_t *card )
2850 {
2851         struct net_device *dev = card->wandev.dev;
2852         ppp_private_area_t *ppp_priv_area = dev->priv;
2853         int err;
2854
2855         struct ifreq if_info;
2856         struct sockaddr_in *if_data1, *if_data2;
2857         mm_segment_t fs;
2858
2859         /* Set Local and remote addresses */
2860         memset(&if_info, 0, sizeof(if_info));
2861         strcpy(if_info.ifr_name, dev->name);
2862
2863
2864         fs = get_fs();
2865         set_fs(get_ds());     /* get user space block */
2866
2867         /* Change the local and remote ip address of the interface.
2868          * This will also add in the destination route.
2869          */
2870         if_data1 = (struct sockaddr_in *)&if_info.ifr_addr;
2871         if_data1->sin_addr.s_addr = ppp_priv_area->ip_local;
2872         if_data1->sin_family = AF_INET;
2873         err = devinet_ioctl( SIOCSIFADDR, &if_info );
2874         if_data2 = (struct sockaddr_in *)&if_info.ifr_dstaddr;
2875         if_data2->sin_addr.s_addr = ppp_priv_area->ip_remote;
2876         if_data2->sin_family = AF_INET;
2877         err = devinet_ioctl( SIOCSIFDSTADDR, &if_info );
2878
2879         set_fs(fs);           /* restore old block */
2880
2881         if (err) {
2882                 printk (KERN_INFO "%s: Adding of route failed: %i\n",
2883                         card->devname,err);
2884                 printk (KERN_INFO "%s:  Local : %u.%u.%u.%u\n",
2885                         card->devname,NIPQUAD(ppp_priv_area->ip_local));
2886                 printk (KERN_INFO "%s:  Remote: %u.%u.%u.%u\n",
2887                         card->devname,NIPQUAD(ppp_priv_area->ip_remote));
2888         }
2889         return err;
2890 }
2891
2892 /*=============================================================================
2893  * Remove Dynamic Route.
2894  * Called when ppp interface disconnected.
2895  */
2896
2897 static void remove_route( sdla_t *card )
2898 {
2899
2900         struct net_device *dev = card->wandev.dev;
2901         long ip_addr;
2902         int err;
2903
2904         mm_segment_t fs;
2905         struct ifreq if_info;
2906         struct sockaddr_in *if_data1;
2907         struct in_device *in_dev = dev->ip_ptr;
2908         struct in_ifaddr *ifa = in_dev->ifa_list;
2909
2910         ip_addr = ifa->ifa_local;
2911
2912         /* Set Local and remote addresses */
2913         memset(&if_info, 0, sizeof(if_info));
2914         strcpy(if_info.ifr_name, dev->name);
2915
2916         fs = get_fs();
2917         set_fs(get_ds());     /* get user space block */
2918
2919         /* Change the local ip address of the interface to 0.
2920          * This will also delete the destination route.
2921          */
2922         if_data1 = (struct sockaddr_in *)&if_info.ifr_addr;
2923         if_data1->sin_addr.s_addr = 0;
2924         if_data1->sin_family = AF_INET;
2925         err = devinet_ioctl( SIOCSIFADDR, &if_info );
2926
2927         set_fs(fs);           /* restore old block */
2928
2929
2930         if (err) {
2931                 printk (KERN_INFO "%s: Deleting dynamic route failed %d!\n",
2932                          card->devname, err);
2933                 return;
2934         }else{
2935                 printk (KERN_INFO "%s: PPP Deleting dynamic route %u.%u.%u.%u successfuly\n",
2936                         card->devname, NIPQUAD(ip_addr));
2937         }
2938         return;
2939 }
2940
2941 /*=============================================================================
2942  * Perform the Interrupt Test by running the READ_CODE_VERSION command MAX_INTR
2943  * _TEST_COUNTER times.
2944  */
2945 static int intr_test( sdla_t *card )
2946 {
2947         ppp_mbox_t *mb = card->mbox;
2948         int err,i;
2949
2950         err = ppp_set_intr_mode( card, 0x08 );
2951
2952         if (err == CMD_OK) {
2953
2954                 for (i = 0; i < MAX_INTR_TEST_COUNTER; i ++) {
2955                         /* Run command READ_CODE_VERSION */
2956                         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
2957                         mb->cmd.length  = 0;
2958                         mb->cmd.command = PPP_READ_CODE_VERSION;
2959                         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
2960                         if (err != CMD_OK)
2961                                 ppp_error(card, err, mb);
2962                 }
2963         }
2964         else return err;
2965
2966         err = ppp_set_intr_mode( card, 0 );
2967         if (err != CMD_OK)
2968                 return err;
2969
2970         return 0;
2971 }
2972
2973 /*==============================================================================
2974  * Determine what type of UDP call it is. DRVSTATS or PTPIPEAB ?
2975  */
2976 static int udp_pkt_type( struct sk_buff *skb, sdla_t *card )
2977 {
2978         unsigned char *sendpacket;
2979         unsigned char buf2[5];
2980         ppp_udp_pkt_t *ppp_udp_pkt = (ppp_udp_pkt_t *)skb->data;
2981
2982         sendpacket = skb->data;
2983         memcpy(&buf2, &card->wandev.udp_port, 2);
2984
2985         if(     ppp_udp_pkt->ip_pkt.ver_inet_hdr_length  == 0x45 &&        /* IP packet */
2986                 sendpacket[9]  == 0x11 &&        /* UDP packet */
2987                 sendpacket[22] == buf2[1] &&     /* UDP Port */
2988                 sendpacket[23] == buf2[0] &&
2989                 sendpacket[36] == 0x01 ) {
2990
2991                 if (    sendpacket[28] == 0x50 &&    /* PTPIPEAB: Signature */
2992                         sendpacket[29] == 0x54 &&
2993                         sendpacket[30] == 0x50 &&
2994                         sendpacket[31] == 0x49 &&
2995                         sendpacket[32] == 0x50 &&
2996                         sendpacket[33] == 0x45 &&
2997                         sendpacket[34] == 0x41 &&
2998                         sendpacket[35] == 0x42 ){
2999
3000                         return UDP_PTPIPE_TYPE;
3001
3002                 } else if(sendpacket[28] == 0x44 &&  /* DRVSTATS: Signature */
3003                         sendpacket[29] == 0x52 &&
3004                         sendpacket[30] == 0x56 &&
3005                         sendpacket[31] == 0x53 &&
3006                         sendpacket[32] == 0x54 &&
3007                         sendpacket[33] == 0x41 &&
3008                         sendpacket[34] == 0x54 &&
3009                         sendpacket[35] == 0x53 ){
3010
3011                         return UDP_DRVSTATS_TYPE;
3012
3013                 } else
3014                         return UDP_INVALID_TYPE;
3015
3016         } else
3017                 return UDP_INVALID_TYPE;
3018
3019 }
3020
3021 /*============================================================================
3022  * Check to see if the packet to be transmitted contains a broadcast or
3023  * multicast source IP address.
3024  */
3025
3026 static int chk_bcast_mcast_addr(sdla_t *card, struct net_device* dev,
3027                                 struct sk_buff *skb)
3028 {
3029         u32 src_ip_addr;
3030         u32 broadcast_ip_addr = 0;
3031         struct in_device *in_dev;
3032
3033         /* read the IP source address from the outgoing packet */
3034         src_ip_addr = *(u32 *)(skb->data + 12);
3035
3036         /* read the IP broadcast address for the device */
3037         in_dev = dev->ip_ptr;
3038         if(in_dev != NULL) {
3039                 struct in_ifaddr *ifa= in_dev->ifa_list;
3040                 if(ifa != NULL)
3041                         broadcast_ip_addr = ifa->ifa_broadcast;
3042                 else
3043                         return 0;
3044         }
3045
3046         /* check if the IP Source Address is a Broadcast address */
3047         if((dev->flags & IFF_BROADCAST) && (src_ip_addr == broadcast_ip_addr)) {
3048                 printk(KERN_INFO "%s: Broadcast Source Address silently discarded\n",
3049                                 card->devname);
3050                 return 1;
3051         }
3052
3053         /* check if the IP Source Address is a Multicast address */
3054         if((ntohl(src_ip_addr) >= 0xE0000001) &&
3055                 (ntohl(src_ip_addr) <= 0xFFFFFFFE)) {
3056                 printk(KERN_INFO "%s: Multicast Source Address silently discarded\n",
3057                                 card->devname);
3058                 return 1;
3059         }
3060
3061         return 0;
3062 }
3063
3064 void s508_lock (sdla_t *card, unsigned long *smp_flags)
3065 {
3066         spin_lock_irqsave(&card->wandev.lock, *smp_flags);
3067 }
3068
3069 void s508_unlock (sdla_t *card, unsigned long *smp_flags)
3070 {
3071         spin_unlock_irqrestore(&card->wandev.lock, *smp_flags);
3072 }
3073
3074 static int read_connection_info (sdla_t *card)
3075 {
3076         ppp_mbox_t *mb = card->mbox;
3077         struct net_device *dev = card->wandev.dev;
3078         ppp_private_area_t *ppp_priv_area = dev->priv;
3079         ppp508_connect_info_t *ppp508_connect_info;
3080         int err;
3081
3082         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
3083         mb->cmd.length  = 0;
3084         mb->cmd.command = PPP_GET_CONNECTION_INFO;
3085         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
3086
3087         if (err != CMD_OK) {
3088                 ppp_error(card, err, mb);
3089                 ppp_priv_area->ip_remote = 0;
3090                 ppp_priv_area->ip_local = 0;
3091         }
3092         else {
3093                 ppp508_connect_info = (ppp508_connect_info_t *)mb->data;
3094                 ppp_priv_area->ip_remote = ppp508_connect_info->ip_remote;
3095                 ppp_priv_area->ip_local = ppp508_connect_info->ip_local;
3096
3097                 NEX_PRINTK(KERN_INFO "READ CONNECTION GOT IP ADDRESS %x, %x\n",
3098                                 ppp_priv_area->ip_remote,
3099                                 ppp_priv_area->ip_local);
3100         }
3101
3102         return err;
3103 }
3104
3105 /*===============================================================================
3106  * config_ppp
3107  *
3108  *      Configure the ppp protocol and enable communications.
3109  *
3110  *      The if_open function binds this function to the poll routine.
3111  *      Therefore, this function will run every time the ppp interface
3112  *      is brought up.
3113  *
3114  *      If the communications are not enabled, proceed to configure
3115  *      the card and enable communications.
3116  *
3117  *      If the communications are enabled, it means that the interface
3118  *      was shutdown by ether the user or driver. In this case, we
3119  *      have to check that the IP addresses have not changed.  If
3120  *      the IP addresses changed, we have to reconfigure the firmware
3121  *      and update the changed IP addresses.  Otherwise, just exit.
3122  */
3123 static int config_ppp (sdla_t *card)
3124 {
3125
3126         struct net_device *dev = card->wandev.dev;
3127         ppp_flags_t *flags = card->flags;
3128         ppp_private_area_t *ppp_priv_area = dev->priv;
3129
3130         if (card->u.p.comm_enabled){
3131
3132                 if (ppp_priv_area->ip_local_tmp != ppp_priv_area->ip_local ||
3133                     ppp_priv_area->ip_remote_tmp != ppp_priv_area->ip_remote){
3134
3135                         /* The IP addersses have changed, we must
3136                          * stop the communications and reconfigure
3137                          * the card. Reason: the firmware must know
3138                          * the local and remote IP addresses. */
3139                         disable_comm(card);
3140                         wanpipe_set_state(card, WAN_DISCONNECTED);
3141                         printk(KERN_INFO
3142                                 "%s: IP addresses changed!\n",
3143                                         card->devname);
3144                         printk(KERN_INFO "%s: Restarting communications ...\n",
3145                                         card->devname);
3146                 }else{
3147                         /* IP addresses are the same and the link is up,
3148                          * we don't have to do anything here. Therefore, exit */
3149                         return 0;
3150                 }
3151         }
3152
3153         /* Record the new IP addreses */
3154         ppp_priv_area->ip_local = ppp_priv_area->ip_local_tmp;
3155         ppp_priv_area->ip_remote = ppp_priv_area->ip_remote_tmp;
3156
3157         if (config508(dev, card)){
3158                 printk(KERN_INFO "%s: Failed to configure PPP device\n",
3159                         card->devname);
3160                 return 0;
3161         }
3162
3163         if (ppp_set_intr_mode(card, PPP_INTR_RXRDY|
3164                                         PPP_INTR_TXRDY|
3165                                         PPP_INTR_MODEM|
3166                                         PPP_INTR_DISC |
3167                                         PPP_INTR_OPEN |
3168                                         PPP_INTR_DROP_DTR |
3169                                         PPP_INTR_TIMER)) {
3170
3171                 printk(KERN_INFO "%s: Failed to configure board interrupts !\n",
3172                         card->devname);
3173                 return 0;
3174         }
3175
3176         /* Turn off the transmit and timer interrupt */
3177         flags->imask &= ~(PPP_INTR_TXRDY | PPP_INTR_TIMER) ;
3178
3179
3180         /* If you are not the authenticator and any one of the protocol is
3181          * enabled then we call the set_out_bound_authentication.
3182          */
3183         if ( !card->u.p.authenticator  && (ppp_priv_area->pap || ppp_priv_area->chap)) {
3184                 if ( ppp_set_outbnd_auth(card, ppp_priv_area) ){
3185                         printk(KERN_INFO "%s: Outbound authentication failed !\n",
3186                                 card->devname);
3187                         return 0;
3188                 }
3189         }
3190
3191         /* If you are the authenticator and any one of the protocol is enabled
3192          * then we call the set_in_bound_authentication.
3193          */
3194         if (card->u.p.authenticator && (ppp_priv_area->pap || ppp_priv_area->chap)){
3195                 if (ppp_set_inbnd_auth(card, ppp_priv_area)){
3196                         printk(KERN_INFO "%s: Inbound authentication failed !\n",
3197                                 card->devname);
3198                         return 0;
3199                 }
3200         }
3201
3202         /* If we fail to enable communications here it's OK,
3203          * since the DTR timer will cause a disconnected, which
3204          * will retrigger communication in timer_intr() */
3205         if (ppp_comm_enable(card) == CMD_OK) {
3206                 wanpipe_set_state(card, WAN_CONNECTING);
3207                 init_ppp_tx_rx_buff(card);
3208         }
3209
3210         return 0;
3211 }
3212
3213 /*============================================================
3214  * ppp_poll
3215  *
3216  * Rationale:
3217  *      We cannot manipulate the routing tables, or
3218  *      ip addresses withing the interrupt. Therefore
3219  *      we must perform such actons outside an interrupt
3220  *      at a later time.
3221  *
3222  * Description:
3223  *      PPP polling routine, responsible for
3224  *      shutting down interfaces upon disconnect
3225  *      and adding/removing routes.
3226  *
3227  * Usage:
3228  *      This function is executed for each ppp
3229  *      interface through a tq_schedule bottom half.
3230  *
3231  *      trigger_ppp_poll() function is used to kick
3232  *      the ppp_poll routine.
3233  */
3234 static void ppp_poll(struct net_device *dev)
3235 {
3236         ppp_private_area_t *ppp_priv_area;
3237         sdla_t *card;
3238         u8 check_gateway=0;
3239         ppp_flags_t *flags;
3240
3241         if (!dev || (ppp_priv_area = dev->priv) == NULL)
3242                 return;
3243
3244         card = ppp_priv_area->card;
3245         flags = card->flags;
3246
3247         /* Shutdown is in progress, stop what you are
3248          * doing and get out */
3249         if (test_bit(PERI_CRIT,&card->wandev.critical)){
3250                 clear_bit(POLL_CRIT,&card->wandev.critical);
3251                 return;
3252         }
3253
3254         /* if_open() function has triggered the polling routine
3255          * to determine the configured IP addresses.  Once the
3256          * addresses are found, trigger the chdlc configuration */
3257         if (test_bit(0,&ppp_priv_area->config_ppp)){
3258
3259                 ppp_priv_area->ip_local_tmp  = get_ip_address(dev,WAN_LOCAL_IP);
3260                 ppp_priv_area->ip_remote_tmp = get_ip_address(dev,WAN_POINTOPOINT_IP);
3261
3262                 if (ppp_priv_area->ip_local_tmp == ppp_priv_area->ip_remote_tmp &&
3263                     card->u.p.ip_mode == WANOPT_PPP_HOST){
3264
3265                         if (++ppp_priv_area->ip_error > MAX_IP_ERRORS){
3266                                 printk(KERN_INFO "\n%s: --- WARNING ---\n",
3267                                                 card->devname);
3268                                 printk(KERN_INFO "%s: The local IP address is the same as the\n",
3269                                                 card->devname);
3270                                 printk(KERN_INFO "%s: Point-to-Point IP address.\n",
3271                                                 card->devname);
3272                                 printk(KERN_INFO "%s: --- WARNING ---\n\n",
3273                                                 card->devname);
3274                         }else{
3275                                 clear_bit(POLL_CRIT,&card->wandev.critical);
3276                                 ppp_priv_area->poll_delay_timer.expires = jiffies+HZ;
3277                                 add_timer(&ppp_priv_area->poll_delay_timer);
3278                                 return;
3279                         }
3280                 }
3281
3282                 ppp_priv_area->timer_int_enabled |= TMR_INT_ENABLED_CONFIG;
3283                 flags->imask |= PPP_INTR_TIMER;
3284                 ppp_priv_area->ip_error=0;
3285
3286                 clear_bit(0,&ppp_priv_area->config_ppp);
3287                 clear_bit(POLL_CRIT,&card->wandev.critical);
3288                 return;
3289         }
3290
3291         /* Dynamic interface implementation, as well as dynamic
3292          * routing.  */
3293
3294         switch (card->wandev.state) {
3295
3296         case WAN_DISCONNECTED:
3297
3298                 /* If the dynamic interface configuration is on, and interface
3299                  * is up, then bring down the netowrk interface */
3300
3301                 if (test_bit(DYN_OPT_ON,&ppp_priv_area->interface_down) &&
3302                     !test_bit(DEV_DOWN,&ppp_priv_area->interface_down)  &&
3303                     card->wandev.dev->flags & IFF_UP){
3304
3305                         printk(KERN_INFO "%s: Interface %s down.\n",
3306                                 card->devname,card->wandev.dev->name);
3307                         change_dev_flags(card->wandev.dev,
3308                                         (card->wandev.dev->flags&~IFF_UP));
3309                         set_bit(DEV_DOWN,&ppp_priv_area->interface_down);
3310                 }else{
3311                         /* We need to check if the local IP address is
3312                          * zero. If it is, we shouldn't try to remove it.
3313                          * For some reason the kernel crashes badly if
3314                          * we try to remove the route twice */
3315
3316                         if (card->wandev.dev->flags & IFF_UP &&
3317                             get_ip_address(card->wandev.dev,WAN_LOCAL_IP) &&
3318                             card->u.p.ip_mode == WANOPT_PPP_PEER){
3319
3320                                 remove_route(card);
3321                         }
3322                 }
3323                 break;
3324
3325         case WAN_CONNECTED:
3326
3327                 /* In SMP machine this code can execute before the interface
3328                  * comes up.  In this case, we must make sure that we do not
3329                  * try to bring up the interface before dev_open() is finished */
3330
3331
3332                 /* DEV_DOWN will be set only when we bring down the interface
3333                  * for the very first time. This way we know that it was us
3334                  * that brought the interface down */
3335
3336                 if (test_bit(DYN_OPT_ON,&ppp_priv_area->interface_down) &&
3337                     test_bit(DEV_DOWN,  &ppp_priv_area->interface_down) &&
3338                     !(card->wandev.dev->flags & IFF_UP)){
3339
3340                         printk(KERN_INFO "%s: Interface %s up.\n",
3341                                 card->devname,card->wandev.dev->name);
3342
3343                         change_dev_flags(card->wandev.dev,(card->wandev.dev->flags|IFF_UP));
3344                         clear_bit(DEV_DOWN,&ppp_priv_area->interface_down);
3345                         check_gateway=1;
3346                 }
3347
3348                 if ((card->u.p.ip_mode == WANOPT_PPP_PEER) &&
3349                     test_bit(1,&Read_connection_info)) {
3350
3351                         process_route(card);
3352                         clear_bit(1,&Read_connection_info);
3353                         check_gateway=1;
3354                 }
3355
3356                 if (ppp_priv_area->gateway && check_gateway)
3357                         add_gateway(card,dev);
3358
3359                 break;
3360         }
3361         clear_bit(POLL_CRIT,&card->wandev.critical);
3362         return;
3363 }
3364
3365 /*============================================================
3366  * trigger_ppp_poll
3367  *
3368  * Description:
3369  *      Add a ppp_poll() task into a tq_scheduler bh handler
3370  *      for a specific interface.  This will kick
3371  *      the ppp_poll() routine at a later time.
3372  *
3373  * Usage:
3374  *      Interrupts use this to defer a taks to
3375  *      a polling routine.
3376  *
3377  */
3378
3379 static void trigger_ppp_poll(struct net_device *dev)
3380 {
3381         ppp_private_area_t *ppp_priv_area;
3382         if ((ppp_priv_area=dev->priv) != NULL){
3383
3384                 sdla_t *card = ppp_priv_area->card;
3385
3386                 if (test_bit(PERI_CRIT,&card->wandev.critical)){
3387                         return;
3388                 }
3389
3390                 if (test_and_set_bit(POLL_CRIT,&card->wandev.critical)){
3391                         return;
3392                 }
3393
3394                 schedule_work(&ppp_priv_area->poll_work);
3395         }
3396         return;
3397 }
3398
3399 static void ppp_poll_delay (unsigned long dev_ptr)
3400 {
3401         struct net_device *dev = (struct net_device *)dev_ptr;
3402         trigger_ppp_poll(dev);
3403 }
3404
3405 /*============================================================
3406  * detect_and_fix_tx_bug
3407  *
3408  * Description:
3409  *      On connect, if the board tx buffer ptr is not the same
3410  *      as the driver tx buffer ptr, we found a firmware bug.
3411  *      Report the bug to the above layer.  To fix the
3412  *      error restart communications again.
3413  *
3414  * Usage:
3415  *
3416  */
3417
3418 static int detect_and_fix_tx_bug (sdla_t *card)
3419 {
3420         if (((unsigned long)card->u.p.txbuf_base&0xFFF) != ((*card->u.p.txbuf_next)&0xFFF)){
3421                 NEX_PRINTK(KERN_INFO "Major Error, Fix the bug\n");
3422                 return 1;
3423         }
3424         return 0;
3425 }
3426
3427 MODULE_LICENSE("GPL");
3428
3429 /****** End *****************************************************************/