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 #include <linux/jiffies.h>      /* time_after() macro */
 105
 106
 107 #include <asm/uaccess.h>
 108 #include <linux/inetdevice.h>
 109 #include <linux/netdevice.h>
 110
 111 #include <linux/if.h>
 112 #include <linux/sdla_ppp.h>             /* PPP firmware API definitions */
 113 #include <linux/sdlasfm.h>              /* S514 Type Definition */
 114 /****** Defines & Macros ****************************************************/
 115
 116 #define PPP_DFLT_MTU    1500            /* default MTU */
 117 #define PPP_MAX_MTU     4000            /* maximum MTU */
 118 #define PPP_HDR_LEN     1
 119
 120 #define MAX_IP_ERRORS 100
 121
 122 #define CONNECT_TIMEOUT (90*HZ)         /* link connection timeout */
 123 #define HOLD_DOWN_TIME  (5*HZ)          /* link hold down time : Changed from 30 to 5 */
 124
 125 /* For handle_IPXWAN() */
 126 #define CVHexToAscii(b) (((unsigned char)(b) > (unsigned char)9) ? ((unsigned char)'A' + ((unsigned char)(b) - (unsigned char)10)) : ((unsigned char)'0' + (unsigned char)(b)))
 127
 128 /* Macro for enabling/disabling debugging comments */
 129 //#define NEX_DEBUG
 130 #ifdef NEX_DEBUG
 131 #define NEX_PRINTK(format, a...) printk(format, ## a)
 132 #else
 133 #define NEX_PRINTK(format, a...)
 134 #endif /* NEX_DEBUG */
 135
 136 #define DCD(a)   ( a & 0x08 ? "HIGH" : "LOW" )
 137 #define CTS(a)   ( a & 0x20 ? "HIGH" : "LOW" )
 138 #define LCP(a)   ( a == 0x09 ? "OPEN" : "CLOSED" )
 139 #define IP(a)    ( a == 0x09 ? "ENABLED" : "DISABLED" )
 140
 141 #define TMR_INT_ENABLED_UPDATE          0x01
 142 #define TMR_INT_ENABLED_PPP_EVENT       0x02
 143 #define TMR_INT_ENABLED_UDP             0x04
 144 #define TMR_INT_ENABLED_CONFIG          0x20
 145
 146 /* Set Configuraton Command Definitions */
 147 #define PERCENT_TX_BUFF                 60
 148 #define TIME_BETWEEN_CONF_REQ           30
 149 #define TIME_BETWEEN_PAP_CHAP_REQ       30
 150 #define WAIT_PAP_CHAP_WITHOUT_REPLY     300
 151 #define WAIT_AFTER_DCD_CTS_LOW          5
 152 #define TIME_DCD_CTS_LOW_AFTER_LNK_DOWN 10
 153 #define WAIT_DCD_HIGH_AFTER_ENABLE_COMM 900
 154 #define MAX_CONF_REQ_WITHOUT_REPLY      10
 155 #define MAX_TERM_REQ_WITHOUT_REPLY      2
 156 #define NUM_CONF_NAK_WITHOUT_REPLY      5
 157 #define NUM_AUTH_REQ_WITHOUT_REPLY      10
 158
 159 #define END_OFFSET 0x1F0
 160
 161
 162 /******Data Structures*****************************************************/
 163
 164 /* This structure is placed in the private data area of the device structure.
 165  * The card structure used to occupy the private area but now the following
 166  * structure will incorporate the card structure along with PPP specific data
 167  */
 168
 169 typedef struct ppp_private_area
 170 {
 171         struct net_device *slave;
 172         sdla_t* card;
 173         unsigned long router_start_time;        /*router start time in sec */
 174         unsigned long tick_counter;             /*used for 5 second counter*/
 175         unsigned mc;                            /*multicast support on or off*/
 176         unsigned char enable_IPX;
 177         unsigned long network_number;
 178         unsigned char pap;
 179         unsigned char chap;
 180         unsigned char sysname[31];              /* system name for in-bnd auth*/
 181         unsigned char userid[511];              /* list of user ids */
 182         unsigned char passwd[511];              /* list of passwords */
 183         unsigned protocol;                      /* SKB Protocol */
 184         u32 ip_local;                           /* Local IP Address */
 185         u32 ip_remote;                          /* remote IP Address */
 186
 187         u32 ip_local_tmp;
 188         u32 ip_remote_tmp;
 189
 190         unsigned char timer_int_enabled;        /* Who enabled the timer inter*/
 191         unsigned char update_comms_stats;       /* Used by update function */
 192         unsigned long curr_trace_addr;          /* Trace information */
 193         unsigned long start_trace_addr;
 194         unsigned long end_trace_addr;
 195
 196         unsigned char interface_down;           /* Brind down interface when channel
 197                                                    goes down */
 198         unsigned long config_wait_timeout;      /* After if_open() if in dynamic if mode,
 199                                                    wait a few seconds before configuring */
 200
 201         unsigned short udp_pkt_lgth;
 202         char  udp_pkt_src;
 203         char  udp_pkt_data[MAX_LGTH_UDP_MGNT_PKT];
 204
 205         /* PPP specific statistics */
 206
 207         if_send_stat_t if_send_stat;
 208         rx_intr_stat_t rx_intr_stat;
 209         pipe_mgmt_stat_t pipe_mgmt_stat;
 210
 211         unsigned long router_up_time;
 212
 213         /* Polling work queue entry. Each interface
 214          * has its own work queue entry, which is used
 215          * to defer events from the interrupt */
 216         struct work_struct poll_work;
 217         struct timer_list poll_delay_timer;
 218
 219         u8 gateway;
 220         u8 config_ppp;
 221         u8 ip_error;
 222
 223 }ppp_private_area_t;
 224
 225 /* variable for keeping track of enabling/disabling FT1 monitor status */
 226 static int rCount = 0;
 227
 228 extern void disable_irq(unsigned int);
 229 extern void enable_irq(unsigned int);
 230
 231 /****** Function Prototypes *************************************************/
 232
 233 /* WAN link driver entry points. These are called by the WAN router module. */
 234 static int update(struct wan_device *wandev);
 235 static int new_if(struct wan_device *wandev, struct net_device *dev,
 236                   wanif_conf_t *conf);
 237 static int del_if(struct wan_device *wandev, struct net_device *dev);
 238
 239 /* WANPIPE-specific entry points */
 240 static int wpp_exec (struct sdla *card, void *u_cmd, void *u_data);
 241
 242 /* Network device interface */
 243 static int if_init(struct net_device *dev);
 244 static int if_open(struct net_device *dev);
 245 static int if_close(struct net_device *dev);
 246 static int if_header(struct sk_buff *skb, struct net_device *dev,
 247                      unsigned short type,
 248                      void *daddr, void *saddr, unsigned len);
 249
 250 static void if_tx_timeout(struct net_device *dev);
 251
 252 static int if_rebuild_hdr(struct sk_buff *skb);
 253 static struct net_device_stats *if_stats(struct net_device *dev);
 254 static int if_send(struct sk_buff *skb, struct net_device *dev);
 255
 256
 257 /* PPP firmware interface functions */
 258 static int ppp_read_version(sdla_t *card, char *str);
 259 static int ppp_set_outbnd_auth(sdla_t *card, ppp_private_area_t *ppp_priv_area);
 260 static int ppp_set_inbnd_auth(sdla_t *card, ppp_private_area_t *ppp_priv_area);
 261 static int ppp_configure(sdla_t *card, void *data);
 262 static int ppp_set_intr_mode(sdla_t *card, unsigned char mode);
 263 static int ppp_comm_enable(sdla_t *card);
 264 static int ppp_comm_disable(sdla_t *card);
 265 static int ppp_comm_disable_shutdown(sdla_t *card);
 266 static int ppp_get_err_stats(sdla_t *card);
 267 static int ppp_send(sdla_t *card, void *data, unsigned len, unsigned proto);
 268 static int ppp_error(sdla_t *card, int err, ppp_mbox_t *mb);
 269
 270 static void wpp_isr(sdla_t *card);
 271 static void rx_intr(sdla_t *card);
 272 static void event_intr(sdla_t *card);
 273 static void timer_intr(sdla_t *card);
 274
 275 /* Background polling routines */
 276 static void process_route(sdla_t *card);
 277 static void retrigger_comm(sdla_t *card);
 278
 279 /* Miscellaneous functions */
 280 static int read_info( sdla_t *card );
 281 static int read_connection_info (sdla_t *card);
 282 static void remove_route( sdla_t *card );
 283 static int config508(struct net_device *dev, sdla_t *card);
 284 static void show_disc_cause(sdla_t * card, unsigned cause);
 285 static int reply_udp( unsigned char *data, unsigned int mbox_len );
 286 static void process_udp_mgmt_pkt(sdla_t *card, struct net_device *dev,
 287                                 ppp_private_area_t *ppp_priv_area);
 288 static void init_ppp_tx_rx_buff( sdla_t *card );
 289 static int intr_test( sdla_t *card );
 290 static int udp_pkt_type( struct sk_buff *skb , sdla_t *card);
 291 static void init_ppp_priv_struct( ppp_private_area_t *ppp_priv_area);
 292 static void init_global_statistics( sdla_t *card );
 293 static int tokenize(char *str, char **tokens);
 294 static char* strstrip(char *str, char *s);
 295 static int chk_bcast_mcast_addr(sdla_t* card, struct net_device* dev,
 296                                 struct sk_buff *skb);
 297
 298 static int config_ppp (sdla_t *);
 299 static void ppp_poll(struct net_device *dev);
 300 static void trigger_ppp_poll(struct net_device *dev);
 301 static void ppp_poll_delay (unsigned long dev_ptr);
 302
 303
 304 static int Read_connection_info;
 305 static int Intr_test_counter;
 306 static unsigned short available_buffer_space;
 307
 308
 309 /* IPX functions */
 310 static void switch_net_numbers(unsigned char *sendpacket, unsigned long network_number,
 311                                unsigned char incoming);
 312 static int handle_IPXWAN(unsigned char *sendpacket, char *devname, unsigned char enable_PX,
 313                          unsigned long network_number, unsigned short proto);
 314
 315 /* Lock Functions */
 316 static void s508_lock (sdla_t *card, unsigned long *smp_flags);
 317 static void s508_unlock (sdla_t *card, unsigned long *smp_flags);
 318
 319 static int store_udp_mgmt_pkt(char udp_pkt_src, sdla_t* card,
 320                                 struct sk_buff *skb, struct net_device* dev,
 321                                 ppp_private_area_t* ppp_priv_area );
 322 static unsigned short calc_checksum (char *data, int len);
 323 static void disable_comm (sdla_t *card);
 324 static int detect_and_fix_tx_bug (sdla_t *card);
 325
 326 /****** Public Functions ****************************************************/
 327
 328 /*============================================================================
 329  * PPP protocol initialization routine.
 330  *
 331  * This routine is called by the main WANPIPE module during setup.  At this
 332  * point adapter is completely initialized and firmware is running.
 333  *  o read firmware version (to make sure it's alive)
 334  *  o configure adapter
 335  *  o initialize protocol-specific fields of the adapter data space.
 336  *
 337  * Return:      0       o.k.
 338  *              < 0     failure.
 339  */
 340 int wpp_init(sdla_t *card, wandev_conf_t *conf)
 341 {
 342         ppp_flags_t *flags;
 343         union
 344         {
 345                 char str[80];
 346         } u;
 347
 348         /* Verify configuration ID */
 349         if (conf->config_id != WANCONFIG_PPP) {
 350
 351                 printk(KERN_INFO "%s: invalid configuration ID %u!\n",
 352                         card->devname, conf->config_id);
 353                 return -EINVAL;
 354
 355         }
 356
 357         /* Initialize miscellaneous pointers to structures on the adapter */
 358         switch (card->hw.type) {
 359
 360                 case SDLA_S508:
 361                         card->mbox =(void*)(card->hw.dpmbase + PPP508_MB_OFFS);
 362                         card->flags=(void*)(card->hw.dpmbase + PPP508_FLG_OFFS);
 363                         break;
 364
 365                 case SDLA_S514:
 366                         card->mbox =(void*)(card->hw.dpmbase + PPP514_MB_OFFS);
 367                         card->flags=(void*)(card->hw.dpmbase + PPP514_FLG_OFFS);
 368                         break;
 369
 370                 default:
 371                         return -EINVAL;
 372
 373         }
 374         flags = card->flags;
 375
 376         /* Read firmware version.  Note that when adapter initializes, it
 377          * clears the mailbox, so it may appear that the first command was
 378          * executed successfully when in fact it was merely erased. To work
 379          * around this, we execute the first command twice.
 380          */
 381         if (ppp_read_version(card, NULL) || ppp_read_version(card, u.str))
 382                 return -EIO;
 383
 384         printk(KERN_INFO "%s: running PPP firmware v%s\n",card->devname, u.str);
 385         /* Adjust configuration and set defaults */
 386         card->wandev.mtu = (conf->mtu) ?
 387                 min_t(unsigned int, conf->mtu, PPP_MAX_MTU) : PPP_DFLT_MTU;
 388
 389         card->wandev.bps        = conf->bps;
 390         card->wandev.interface  = conf->interface;
 391         card->wandev.clocking   = conf->clocking;
 392         card->wandev.station    = conf->station;
 393         card->isr               = &wpp_isr;
 394         card->poll              = NULL;
 395         card->exec              = &wpp_exec;
 396         card->wandev.update     = &update;
 397         card->wandev.new_if     = &new_if;
 398         card->wandev.del_if     = &del_if;
 399         card->wandev.udp_port   = conf->udp_port;
 400         card->wandev.ttl        = conf->ttl;
 401         card->wandev.state      = WAN_DISCONNECTED;
 402         card->disable_comm      = &disable_comm;
 403         card->irq_dis_if_send_count = 0;
 404         card->irq_dis_poll_count = 0;
 405         card->u.p.authenticator = conf->u.ppp.authenticator;
 406         card->u.p.ip_mode       = conf->u.ppp.ip_mode ?
 407                                  conf->u.ppp.ip_mode : WANOPT_PPP_STATIC;
 408         card->TracingEnabled    = 0;
 409         Read_connection_info    = 1;
 410
 411         /* initialize global statistics */
 412         init_global_statistics( card );
 413
 414
 415
 416         if (!card->configured){
 417                 int err;
 418
 419                 Intr_test_counter = 0;
 420                 err = intr_test(card);
 421
 422                 if(err || (Intr_test_counter < MAX_INTR_TEST_COUNTER)) {
 423                         printk("%s: Interrupt Test Failed, Counter: %i\n",
 424                                 card->devname, Intr_test_counter);
 425                         printk( "%s: Please choose another interrupt\n",card->devname);
 426                         return -EIO;
 427                 }
 428
 429                 printk(KERN_INFO "%s: Interrupt Test Passed, Counter: %i\n",
 430                         card->devname, Intr_test_counter);
 431                 card->configured = 1;
 432         }
 433
 434         ppp_set_intr_mode(card, PPP_INTR_TIMER);
 435
 436         /* Turn off the transmit and timer interrupt */
 437         flags->imask &= ~PPP_INTR_TIMER;
 438
 439         printk(KERN_INFO "\n");
 440
 441         return 0;
 442 }
 443
 444 /******* WAN Device Driver Entry Points *************************************/
 445
 446 /*============================================================================
 447  * Update device status & statistics.
 448  */
 449 static int update(struct wan_device *wandev)
 450 {
 451         sdla_t* card = wandev->private;
 452         struct net_device* dev;
 453         volatile ppp_private_area_t *ppp_priv_area;
 454         ppp_flags_t *flags = card->flags;
 455         unsigned long timeout;
 456
 457         /* sanity checks */
 458         if ((wandev == NULL) || (wandev->private == NULL))
 459                 return -EFAULT;
 460
 461         if (wandev->state == WAN_UNCONFIGURED)
 462                 return -ENODEV;
 463
 464         /* Shutdown bug fix. This function can be
 465          * called with NULL dev pointer during
 466          * shutdown
 467          */
 468         if ((dev=card->wandev.dev) == NULL){
 469                 return -ENODEV;
 470         }
 471
 472         if ((ppp_priv_area=dev->priv) == NULL){
 473                 return -ENODEV;
 474         }
 475
 476         ppp_priv_area->update_comms_stats = 2;
 477         ppp_priv_area->timer_int_enabled |= TMR_INT_ENABLED_UPDATE;
 478         flags->imask |= PPP_INTR_TIMER;
 479
 480         /* wait a maximum of 1 second for the statistics to be updated */
 481         timeout = jiffies;
 482         for(;;) {
 483                 if(ppp_priv_area->update_comms_stats == 0){
 484                         break;
 485                 }
 486                 if (time_after(jiffies, timeout + 1 * HZ)){
 487                         ppp_priv_area->update_comms_stats = 0;
 488                         ppp_priv_area->timer_int_enabled &=
 489                                 ~TMR_INT_ENABLED_UPDATE;
 490                         return -EAGAIN;
 491                 }
 492         }
 493
 494         return 0;
 495 }
 496
 497 /*============================================================================
 498  * Create new logical channel.
 499  * This routine is called by the router when ROUTER_IFNEW IOCTL is being
 500  * handled.
 501  * o parse media- and hardware-specific configuration
 502  * o make sure that a new channel can be created
 503  * o allocate resources, if necessary
 504  * o prepare network device structure for registaration.
 505  *
 506  * Return:      0       o.k.
 507  *              < 0     failure (channel will not be created)
 508  */
 509 static int new_if(struct wan_device *wandev, struct net_device *dev,
 510                   wanif_conf_t *conf)
 511 {
 512         sdla_t *card = wandev->private;
 513         ppp_private_area_t *ppp_priv_area;
 514
 515         if (wandev->ndev)
 516                 return -EEXIST;
 517
 518
 519         printk(KERN_INFO "%s: Configuring Interface: %s\n",
 520                         card->devname, conf->name);
 521
 522         if ((conf->name[0] == '\0') || (strlen(conf->name) > WAN_IFNAME_SZ)) {
 523
 524                 printk(KERN_INFO "%s: Invalid interface name!\n",
 525                         card->devname);
 526                 return -EINVAL;
 527
 528         }
 529
 530         /* allocate and initialize private data */
 531         ppp_priv_area = kmalloc(sizeof(ppp_private_area_t), GFP_KERNEL);
 532
 533         if( ppp_priv_area == NULL )
 534                 return  -ENOMEM;
 535
 536         memset(ppp_priv_area, 0, sizeof(ppp_private_area_t));
 537
 538         ppp_priv_area->card = card;
 539
 540         /* initialize data */
 541         strcpy(card->u.p.if_name, conf->name);
 542
 543         /* initialize data in ppp_private_area structure */
 544
 545         init_ppp_priv_struct( ppp_priv_area );
 546
 547         ppp_priv_area->mc = conf->mc;
 548         ppp_priv_area->pap = conf->pap;
 549         ppp_priv_area->chap = conf->chap;
 550
 551         /* Option to bring down the interface when
 552          * the link goes down */
 553         if (conf->if_down){
 554                 set_bit(DYN_OPT_ON,&ppp_priv_area->interface_down);
 555                 printk("%s: Dynamic interface configuration enabled\n",
 556                         card->devname);
 557         }
 558
 559         /* If no user ids are specified */
 560         if(!strlen(conf->userid) && (ppp_priv_area->pap||ppp_priv_area->chap)){
 561                 kfree(ppp_priv_area);
 562                 return -EINVAL;
 563         }
 564
 565         /* If no passwords are specified */
 566         if(!strlen(conf->passwd) && (ppp_priv_area->pap||ppp_priv_area->chap)){
 567                 kfree(ppp_priv_area);
 568                 return -EINVAL;
 569         }
 570
 571         if(strlen(conf->sysname) > 31){
 572                 kfree(ppp_priv_area);
 573                 return -EINVAL;
 574         }
 575
 576         /* If no system name is specified */
 577         if(!strlen(conf->sysname) && (card->u.p.authenticator)){
 578                 kfree(ppp_priv_area);
 579                 return -EINVAL;
 580         }
 581
 582         /* copy the data into the ppp private structure */
 583         memcpy(ppp_priv_area->userid, conf->userid, strlen(conf->userid));
 584         memcpy(ppp_priv_area->passwd, conf->passwd, strlen(conf->passwd));
 585         memcpy(ppp_priv_area->sysname, conf->sysname, strlen(conf->sysname));
 586
 587
 588         ppp_priv_area->enable_IPX = conf->enable_IPX;
 589         if (conf->network_number){
 590                 ppp_priv_area->network_number = conf->network_number;
 591         }else{
 592                 ppp_priv_area->network_number = 0xDEADBEEF;
 593         }
 594
 595         /* Tells us that if this interface is a
 596          * gateway or not */
 597         if ((ppp_priv_area->gateway = conf->gateway) == WANOPT_YES){
 598                 printk(KERN_INFO "%s: Interface %s is set as a gateway.\n",
 599                         card->devname,card->u.p.if_name);
 600         }
 601
 602         /* prepare network device data space for registration */
 603         strcpy(dev->name,card->u.p.if_name);
 604
 605         dev->init = &if_init;
 606         dev->priv = ppp_priv_area;
 607         dev->mtu = min_t(unsigned int, dev->mtu, card->wandev.mtu);
 608
 609         /* Initialize the polling work routine */
 610         INIT_WORK(&ppp_priv_area->poll_work, (void*)(void*)ppp_poll, dev);
 611
 612         /* Initialize the polling delay timer */
 613         init_timer(&ppp_priv_area->poll_delay_timer);
 614         ppp_priv_area->poll_delay_timer.data = (unsigned long)dev;
 615         ppp_priv_area->poll_delay_timer.function = ppp_poll_delay;
 616
 617
 618         /* Since we start with dummy IP addresses we can say
 619          * that route exists */
 620         printk(KERN_INFO "\n");
 621
 622         return 0;
 623 }
 624
 625 /*============================================================================
 626  * Delete logical channel.
 627  */
 628 static int del_if(struct wan_device *wandev, struct net_device *dev)
 629 {
 630         return 0;
 631 }
 632
 633 static void disable_comm (sdla_t *card)
 634 {
 635         ppp_comm_disable_shutdown(card);
 636         return;
 637 }
 638
 639 /****** WANPIPE-specific entry points ***************************************/
 640
 641 /*============================================================================
 642  * Execute adapter interface command.
 643  */
 644
 645 //FIXME: Why do we need this ????
 646 static int wpp_exec(struct sdla *card, void *u_cmd, void *u_data)
 647 {
 648         ppp_mbox_t *mbox = card->mbox;
 649         int len;
 650
 651         if (copy_from_user((void*)&mbox->cmd, u_cmd, sizeof(ppp_cmd_t)))
 652                 return -EFAULT;
 653
 654         len = mbox->cmd.length;
 655
 656         if (len) {
 657
 658                 if( copy_from_user((void*)&mbox->data, u_data, len))
 659                         return -EFAULT;
 660
 661         }
 662
 663         /* execute command */
 664         if (!sdla_exec(mbox))
 665                 return -EIO;
 666
 667         /* return result */
 668         if( copy_to_user(u_cmd, (void*)&mbox->cmd, sizeof(ppp_cmd_t)))
 669                 return -EFAULT;
 670         len = mbox->cmd.length;
 671
 672         if (len && u_data && copy_to_user(u_data, (void*)&mbox->data, len))
 673                 return -EFAULT;
 674
 675         return 0;
 676 }
 677
 678 /****** Network Device Interface ********************************************/
 679
 680 /*============================================================================
 681  * Initialize Linux network interface.
 682  *
 683  * This routine is called only once for each interface, during Linux network
 684  * interface registration.  Returning anything but zero will fail interface
 685  * registration.
 686  */
 687 static int if_init(struct net_device *dev)
 688 {
 689         ppp_private_area_t *ppp_priv_area = dev->priv;
 690         sdla_t *card = ppp_priv_area->card;
 691         struct wan_device *wandev = &card->wandev;
 692
 693         /* Initialize device driver entry points */
 694         dev->open               = &if_open;
 695         dev->stop               = &if_close;
 696         dev->hard_header        = &if_header;
 697         dev->rebuild_header     = &if_rebuild_hdr;
 698         dev->hard_start_xmit    = &if_send;
 699         dev->get_stats          = &if_stats;
 700         dev->tx_timeout         = &if_tx_timeout;
 701         dev->watchdog_timeo     = TX_TIMEOUT;
 702
 703         /* Initialize media-specific parameters */
 704         dev->type               = ARPHRD_PPP;   /* ARP h/w type */
 705         dev->flags              |= IFF_POINTOPOINT;
 706         dev->flags              |= IFF_NOARP;
 707
 708         /* Enable Mulitcasting if specified by user*/
 709         if (ppp_priv_area->mc == WANOPT_YES){
 710                 dev->flags      |= IFF_MULTICAST;
 711         }
 712
 713         dev->mtu                = wandev->mtu;
 714         dev->hard_header_len    = PPP_HDR_LEN;  /* media header length */
 715
 716         /* Initialize hardware parameters (just for reference) */
 717         dev->irq                = wandev->irq;
 718         dev->dma                = wandev->dma;
 719         dev->base_addr          = wandev->ioport;
 720         dev->mem_start          = wandev->maddr;
 721         dev->mem_end            = wandev->maddr + wandev->msize - 1;
 722
 723         /* Set transmit buffer queue length */
 724         dev->tx_queue_len = 100;
 725         SET_MODULE_OWNER(dev);
 726
 727         return 0;
 728 }
 729
 730 /*============================================================================
 731  * Open network interface.
 732  * o enable communications and interrupts.
 733  * o prevent module from unloading by incrementing use count
 734  *
 735  * Return 0 if O.k. or errno.
 736  */
 737 static int if_open(struct net_device *dev)
 738 {
 739         ppp_private_area_t *ppp_priv_area = dev->priv;
 740         sdla_t *card = ppp_priv_area->card;
 741         struct timeval tv;
 742         //unsigned long smp_flags;
 743
 744         if (netif_running(dev))
 745                 return -EBUSY;
 746
 747         wanpipe_open(card);
 748
 749         netif_start_queue(dev);
 750
 751         do_gettimeofday( &tv );
 752         ppp_priv_area->router_start_time = tv.tv_sec;
 753
 754         /* We cannot configure the card here because we don't
 755          * have access to the interface IP addresses.
 756          * Once the interface initilization is complete, we will be
 757          * able to access the IP addresses.  Therefore,
 758          * configure the ppp link in the poll routine */
 759         set_bit(0,&ppp_priv_area->config_ppp);
 760         ppp_priv_area->config_wait_timeout=jiffies;
 761
 762         /* Start the PPP configuration after 1sec delay.
 763          * This will give the interface initilization time
 764          * to finish its configuration */
 765         mod_timer(&ppp_priv_area->poll_delay_timer, jiffies + HZ);
 766         return 0;
 767 }
 768
 769 /*============================================================================
 770  * Close network interface.
 771  * o if this is the last open, then disable communications and interrupts.
 772  * o reset flags.
 773  */
 774 static int if_close(struct net_device *dev)
 775 {
 776         ppp_private_area_t *ppp_priv_area = dev->priv;
 777         sdla_t *card = ppp_priv_area->card;
 778
 779         netif_stop_queue(dev);
 780         wanpipe_close(card);
 781
 782         del_timer (&ppp_priv_area->poll_delay_timer);
 783         return 0;
 784 }
 785
 786 /*============================================================================
 787  * Build media header.
 788  *
 789  * The trick here is to put packet type (Ethertype) into 'protocol' field of
 790  * the socket buffer, so that we don't forget it.  If packet type is not
 791  * supported, set skb->protocol to 0 and discard packet later.
 792  *
 793  * Return:      media header length.
 794  */
 795 static int if_header(struct sk_buff *skb, struct net_device *dev,
 796         unsigned short type, void *daddr, void *saddr, unsigned len)
 797 {
 798         switch (type)
 799         {
 800                 case ETH_P_IP:
 801                 case ETH_P_IPX:
 802                         skb->protocol = htons(type);
 803                         break;
 804
 805                 default:
 806                         skb->protocol = 0;
 807         }
 808
 809         return PPP_HDR_LEN;
 810 }
 811
 812 /*============================================================================
 813  * Re-build media header.
 814  *
 815  * Return:      1       physical address resolved.
 816  *              0       physical address not resolved
 817  */
 818 static int if_rebuild_hdr (struct sk_buff *skb)
 819 {
 820         struct net_device *dev = skb->dev;
 821         ppp_private_area_t *ppp_priv_area = dev->priv;
 822         sdla_t *card = ppp_priv_area->card;
 823
 824         printk(KERN_INFO "%s: rebuild_header() called for interface %s!\n",
 825                 card->devname, dev->name);
 826         return 1;
 827 }
 828
 829 /*============================================================================
 830  * Handle transmit timeout event from netif watchdog
 831  */
 832 static void if_tx_timeout(struct net_device *dev)
 833 {
 834         ppp_private_area_t* chan = dev->priv;
 835         sdla_t *card = chan->card;
 836
 837         /* If our device stays busy for at least 5 seconds then we will
 838          * kick start the device by making dev->tbusy = 0.  We expect
 839          * that our device never stays busy more than 5 seconds. So this
 840          * is only used as a last resort.
 841          */
 842
 843         ++ chan->if_send_stat.if_send_tbusy;
 844         ++card->wandev.stats.collisions;
 845
 846         printk (KERN_INFO "%s: Transmit timed out on %s\n", card->devname,dev->name);
 847         ++chan->if_send_stat.if_send_tbusy_timeout;
 848         netif_wake_queue (dev);
 849 }
 850
 851
 852
 853 /*============================================================================
 854  * Send a packet on a network interface.
 855  * o set tbusy flag (marks start of the transmission) to block a timer-based
 856  *   transmit from overlapping.
 857  * o check link state. If link is not up, then drop the packet.
 858  * o execute adapter send command.
 859  * o free socket buffer
 860  *
 861  * Return:      0       complete (socket buffer must be freed)
 862  *              non-0   packet may be re-transmitted (tbusy must be set)
 863  *
 864  * Notes:
 865  * 1. This routine is called either by the protocol stack or by the "net
 866  *    bottom half" (with interrupts enabled).
 867  * 2. Setting tbusy flag will inhibit further transmit requests from the
 868  *    protocol stack and can be used for flow control with protocol layer.
 869  */
 870 static int if_send (struct sk_buff *skb, struct net_device *dev)
 871 {
 872         ppp_private_area_t *ppp_priv_area = dev->priv;
 873         sdla_t *card = ppp_priv_area->card;
 874         unsigned char *sendpacket;
 875         unsigned long smp_flags;
 876         ppp_flags_t *flags = card->flags;
 877         int udp_type;
 878         int err=0;
 879
 880         ++ppp_priv_area->if_send_stat.if_send_entry;
 881
 882         netif_stop_queue(dev);
 883
 884         if (skb == NULL) {
 885
 886                 /* If we get here, some higher layer thinks we've missed an
 887                  * tx-done interrupt.
 888                  */
 889                 printk(KERN_INFO "%s: interface %s got kicked!\n",
 890                         card->devname, dev->name);
 891
 892                 ++ppp_priv_area->if_send_stat.if_send_skb_null;
 893
 894                 netif_wake_queue(dev);
 895                 return 0;
 896         }
 897
 898         sendpacket = skb->data;
 899
 900         udp_type = udp_pkt_type( skb, card );
 901
 902
 903         if (udp_type == UDP_PTPIPE_TYPE){
 904                 if(store_udp_mgmt_pkt(UDP_PKT_FRM_STACK, card, skb, dev,
 905                                       ppp_priv_area)){
 906                         flags->imask |= PPP_INTR_TIMER;
 907                 }
 908                 ++ppp_priv_area->if_send_stat.if_send_PIPE_request;
 909                 netif_start_queue(dev);
 910                 return 0;
 911         }
 912
 913         /* Check for broadcast and multicast addresses
 914          * If found, drop (deallocate) a packet and return.
 915          */
 916         if(chk_bcast_mcast_addr(card, dev, skb)){
 917                 ++card->wandev.stats.tx_dropped;
 918                 dev_kfree_skb_any(skb);
 919                 netif_start_queue(dev);
 920                 return 0;
 921         }
 922
 923
 924         if(card->hw.type != SDLA_S514){
 925                 s508_lock(card,&smp_flags);
 926         }
 927
 928         if (test_and_set_bit(SEND_CRIT, (void*)&card->wandev.critical)) {
 929
 930                 printk(KERN_INFO "%s: Critical in if_send: %lx\n",
 931                                 card->wandev.name,card->wandev.critical);
 932
 933                 ++card->wandev.stats.tx_dropped;
 934                 ++ppp_priv_area->if_send_stat.if_send_critical_non_ISR;
 935                 netif_start_queue(dev);
 936                 goto if_send_exit_crit;
 937         }
 938
 939         if (card->wandev.state != WAN_CONNECTED) {
 940
 941                 ++ppp_priv_area->if_send_stat.if_send_wan_disconnected;
 942                 ++card->wandev.stats.tx_dropped;
 943                 netif_start_queue(dev);
 944
 945         } else if (!skb->protocol) {
 946                 ++ppp_priv_area->if_send_stat.if_send_protocol_error;
 947                 ++card->wandev.stats.tx_errors;
 948                 netif_start_queue(dev);
 949
 950         } else {
 951
 952                 /*If it's IPX change the network numbers to 0 if they're ours.*/
 953                 if( skb->protocol == htons(ETH_P_IPX) ) {
 954                         if(ppp_priv_area->enable_IPX) {
 955                                 switch_net_numbers( skb->data,
 956                                         ppp_priv_area->network_number, 0);
 957                         } else {
 958                                 ++card->wandev.stats.tx_dropped;
 959                                 netif_start_queue(dev);
 960                                 goto if_send_exit_crit;
 961                         }
 962                 }
 963
 964                 if (ppp_send(card, skb->data, skb->len, skb->protocol)) {
 965                         netif_stop_queue(dev);
 966                         ++ppp_priv_area->if_send_stat.if_send_adptr_bfrs_full;
 967                         ++ppp_priv_area->if_send_stat.if_send_tx_int_enabled;
 968                 } else {
 969                         ++ppp_priv_area->if_send_stat.if_send_bfr_passed_to_adptr;
 970                         ++card->wandev.stats.tx_packets;
 971                         card->wandev.stats.tx_bytes += skb->len;
 972                         netif_start_queue(dev);
 973                         dev->trans_start = jiffies;
 974                 }
 975         }
 976
 977 if_send_exit_crit:
 978
 979         if (!(err=netif_queue_stopped(dev))){
 980                 dev_kfree_skb_any(skb);
 981         }else{
 982                 ppp_priv_area->tick_counter = jiffies;
 983                 flags->imask |= PPP_INTR_TXRDY; /* unmask Tx interrupts */
 984         }
 985
 986         clear_bit(SEND_CRIT,&card->wandev.critical);
 987         if(card->hw.type != SDLA_S514){
 988                 s508_unlock(card,&smp_flags);
 989         }
 990
 991         return err;
 992 }
 993
 994
 995 /*=============================================================================
 996  * Store a UDP management packet for later processing.
 997  */
 998
 999 static int store_udp_mgmt_pkt(char udp_pkt_src, sdla_t* card,
1000                                 struct sk_buff *skb, struct net_device* dev,
1001                                 ppp_private_area_t* ppp_priv_area )
1002 {
1003         int udp_pkt_stored = 0;
1004
1005         if(!ppp_priv_area->udp_pkt_lgth && (skb->len<=MAX_LGTH_UDP_MGNT_PKT)){
1006                 ppp_priv_area->udp_pkt_lgth = skb->len;
1007                 ppp_priv_area->udp_pkt_src = udp_pkt_src;
1008                 memcpy(ppp_priv_area->udp_pkt_data, skb->data, skb->len);
1009                 ppp_priv_area->timer_int_enabled |= TMR_INT_ENABLED_UDP;
1010                 ppp_priv_area->protocol = skb->protocol;
1011                 udp_pkt_stored = 1;
1012         }else{
1013                 if (skb->len > MAX_LGTH_UDP_MGNT_PKT){
1014                         printk(KERN_INFO "%s: PIPEMON UDP request too long : %i\n",
1015                                 card->devname, skb->len);
1016                 }else{
1017                         printk(KERN_INFO "%s: PIPEMON UPD request already pending\n",
1018                                 card->devname);
1019                 }
1020                 ppp_priv_area->udp_pkt_lgth = 0;
1021         }
1022
1023         if(udp_pkt_src == UDP_PKT_FRM_STACK){
1024                 dev_kfree_skb_any(skb);
1025         }else{
1026                 dev_kfree_skb_any(skb);
1027         }
1028
1029         return(udp_pkt_stored);
1030 }
1031
1032
1033
1034 /*============================================================================
1035  * Reply to UDP Management system.
1036  * Return length of reply.
1037  */
1038 static int reply_udp( unsigned char *data, unsigned int mbox_len )
1039 {
1040         unsigned short len, udp_length, temp, ip_length;
1041         unsigned long ip_temp;
1042         int even_bound = 0;
1043         ppp_udp_pkt_t *p_udp_pkt = (ppp_udp_pkt_t *)data;
1044
1045         /* Set length of packet */
1046         len = sizeof(ip_pkt_t)+
1047               sizeof(udp_pkt_t)+
1048               sizeof(wp_mgmt_t)+
1049               sizeof(cblock_t)+
1050               mbox_len;
1051
1052         /* fill in UDP reply */
1053         p_udp_pkt->wp_mgmt.request_reply = UDPMGMT_REPLY;
1054
1055         /* fill in UDP length */
1056         udp_length = sizeof(udp_pkt_t)+
1057                      sizeof(wp_mgmt_t)+
1058                      sizeof(cblock_t)+
1059                      mbox_len;
1060
1061
1062         /* put it on an even boundary */
1063         if ( udp_length & 0x0001 ) {
1064                 udp_length += 1;
1065                 len += 1;
1066                 even_bound=1;
1067         }
1068
1069         temp = (udp_length<<8)|(udp_length>>8);
1070         p_udp_pkt->udp_pkt.udp_length = temp;
1071
1072
1073         /* swap UDP ports */
1074         temp = p_udp_pkt->udp_pkt.udp_src_port;
1075         p_udp_pkt->udp_pkt.udp_src_port =
1076                         p_udp_pkt->udp_pkt.udp_dst_port;
1077         p_udp_pkt->udp_pkt.udp_dst_port = temp;
1078
1079
1080         /* add UDP pseudo header */
1081         temp = 0x1100;
1082         *((unsigned short *)(p_udp_pkt->data+mbox_len+even_bound)) = temp;
1083         temp = (udp_length<<8)|(udp_length>>8);
1084         *((unsigned short *)(p_udp_pkt->data+mbox_len+even_bound+2)) = temp;
1085
1086         /* calculate UDP checksum */
1087         p_udp_pkt->udp_pkt.udp_checksum = 0;
1088         p_udp_pkt->udp_pkt.udp_checksum =
1089                 calc_checksum(&data[UDP_OFFSET],udp_length+UDP_OFFSET);
1090
1091         /* fill in IP length */
1092         ip_length = udp_length + sizeof(ip_pkt_t);
1093         temp = (ip_length<<8)|(ip_length>>8);
1094         p_udp_pkt->ip_pkt.total_length = temp;
1095
1096         /* swap IP addresses */
1097         ip_temp = p_udp_pkt->ip_pkt.ip_src_address;
1098         p_udp_pkt->ip_pkt.ip_src_address = p_udp_pkt->ip_pkt.ip_dst_address;
1099         p_udp_pkt->ip_pkt.ip_dst_address = ip_temp;
1100
1101         /* fill in IP checksum */
1102         p_udp_pkt->ip_pkt.hdr_checksum = 0;
1103         p_udp_pkt->ip_pkt.hdr_checksum = calc_checksum(data,sizeof(ip_pkt_t));
1104
1105         return len;
1106
1107 } /* reply_udp */
1108
1109 unsigned short calc_checksum (char *data, int len)
1110 {
1111         unsigned short temp;
1112         unsigned long sum=0;
1113         int i;
1114
1115         for( i = 0; i <len; i+=2 ) {
1116                 memcpy(&temp,&data[i],2);
1117                 sum += (unsigned long)temp;
1118         }
1119
1120         while (sum >> 16 ) {
1121                 sum = (sum & 0xffffUL) + (sum >> 16);
1122         }
1123
1124         temp = (unsigned short)sum;
1125         temp = ~temp;
1126
1127         if( temp == 0 )
1128                 temp = 0xffff;
1129
1130         return temp;
1131 }
1132
1133 /*
1134    If incoming is 0 (outgoing)- if the net numbers is ours make it 0
1135    if incoming is 1 - if the net number is 0 make it ours
1136
1137 */
1138 static void switch_net_numbers(unsigned char *sendpacket, unsigned long network_number, unsigned char incoming)
1139 {
1140         unsigned long pnetwork_number;
1141
1142         pnetwork_number = (unsigned long)((sendpacket[6] << 24) +
1143                           (sendpacket[7] << 16) + (sendpacket[8] << 8) +
1144                           sendpacket[9]);
1145
1146         if (!incoming) {
1147                 //If the destination network number is ours, make it 0
1148                 if( pnetwork_number == network_number) {
1149                         sendpacket[6] = sendpacket[7] = sendpacket[8] =
1150                                          sendpacket[9] = 0x00;
1151                 }
1152         } else {
1153                 //If the incoming network is 0, make it ours
1154                 if( pnetwork_number == 0) {
1155                         sendpacket[6] = (unsigned char)(network_number >> 24);
1156                         sendpacket[7] = (unsigned char)((network_number &
1157                                          0x00FF0000) >> 16);
1158                         sendpacket[8] = (unsigned char)((network_number &
1159                                          0x0000FF00) >> 8);
1160                         sendpacket[9] = (unsigned char)(network_number &
1161                                          0x000000FF);
1162                 }
1163         }
1164
1165
1166         pnetwork_number = (unsigned long)((sendpacket[18] << 24) +
1167                           (sendpacket[19] << 16) + (sendpacket[20] << 8) +
1168                           sendpacket[21]);
1169
1170         if( !incoming ) {
1171                 //If the source network is ours, make it 0
1172                 if( pnetwork_number == network_number) {
1173                         sendpacket[18] = sendpacket[19] = sendpacket[20] =
1174                                          sendpacket[21] = 0x00;
1175                 }
1176         } else {
1177                 //If the source network is 0, make it ours
1178                 if( pnetwork_number == 0 ) {
1179                         sendpacket[18] = (unsigned char)(network_number >> 24);
1180                         sendpacket[19] = (unsigned char)((network_number &
1181                                          0x00FF0000) >> 16);
1182                         sendpacket[20] = (unsigned char)((network_number &
1183                                          0x0000FF00) >> 8);
1184                         sendpacket[21] = (unsigned char)(network_number &
1185                                          0x000000FF);
1186                 }
1187         }
1188 } /* switch_net_numbers */
1189
1190 /*============================================================================
1191  * Get ethernet-style interface statistics.
1192  * Return a pointer to struct net_device_stats.
1193  */
1194 static struct net_device_stats *if_stats(struct net_device *dev)
1195 {
1196
1197         ppp_private_area_t *ppp_priv_area = dev->priv;
1198         sdla_t* card;
1199
1200         if( ppp_priv_area == NULL )
1201                 return NULL;
1202
1203         card = ppp_priv_area->card;
1204         return &card->wandev.stats;
1205 }
1206
1207 /****** PPP Firmware Interface Functions ************************************/
1208
1209 /*============================================================================
1210  * Read firmware code version.
1211  *      Put code version as ASCII string in str.
1212  */
1213 static int ppp_read_version(sdla_t *card, char *str)
1214 {
1215         ppp_mbox_t *mb = card->mbox;
1216         int err;
1217
1218         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
1219         mb->cmd.command = PPP_READ_CODE_VERSION;
1220         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
1221
1222         if (err != CMD_OK)
1223
1224                 ppp_error(card, err, mb);
1225
1226         else if (str) {
1227
1228                 int len = mb->cmd.length;
1229
1230                 memcpy(str, mb->data, len);
1231                 str[len] = '\0';
1232
1233         }
1234
1235         return err;
1236 }
1237 /*===========================================================================
1238  * Set Out-Bound Authentication.
1239 */
1240 static int ppp_set_outbnd_auth (sdla_t *card, ppp_private_area_t *ppp_priv_area)
1241 {
1242         ppp_mbox_t *mb = card->mbox;
1243         int err;
1244
1245         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
1246         memset(&mb->data, 0, (strlen(ppp_priv_area->userid) +
1247                                         strlen(ppp_priv_area->passwd) + 2 ) );
1248         memcpy(mb->data, ppp_priv_area->userid, strlen(ppp_priv_area->userid));
1249         memcpy((mb->data + strlen(ppp_priv_area->userid) + 1),
1250                 ppp_priv_area->passwd, strlen(ppp_priv_area->passwd));
1251
1252         mb->cmd.length  = strlen(ppp_priv_area->userid) +
1253                                         strlen(ppp_priv_area->passwd) + 2 ;
1254
1255         mb->cmd.command = PPP_SET_OUTBOUND_AUTH;
1256
1257         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
1258
1259         if (err != CMD_OK)
1260                 ppp_error(card, err, mb);
1261
1262         return err;
1263 }
1264
1265 /*===========================================================================
1266  * Set In-Bound Authentication.
1267 */
1268 static int ppp_set_inbnd_auth (sdla_t *card, ppp_private_area_t *ppp_priv_area)
1269 {
1270         ppp_mbox_t *mb = card->mbox;
1271         int err, i;
1272         char* user_tokens[32];
1273         char* pass_tokens[32];
1274         int userids, passwds;
1275         int add_ptr;
1276
1277         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
1278         memset(&mb->data, 0, 1008);
1279         memcpy(mb->data, ppp_priv_area->sysname,
1280                                                 strlen(ppp_priv_area->sysname));
1281
1282         /* Parse the userid string and the password string and build a string
1283            to copy it to the data area of the command structure.   The string
1284            will look like "SYS_NAME<NULL>USER1<NULL>PASS1<NULL>USER2<NULL>PASS2
1285            ....<NULL> "
1286          */
1287         userids = tokenize( ppp_priv_area->userid, user_tokens);
1288         passwds = tokenize( ppp_priv_area->passwd, pass_tokens);
1289
1290         if (userids != passwds){
1291                 printk(KERN_INFO "%s: Number of passwords does not equal the number of user ids\n", card->devname);
1292                 return 1;
1293         }
1294
1295         add_ptr = strlen(ppp_priv_area->sysname) + 1;
1296         for (i=0; i<userids; i++){
1297                 memcpy((mb->data + add_ptr), user_tokens[i],
1298                                                         strlen(user_tokens[i]));
1299                 memcpy((mb->data + add_ptr + strlen(user_tokens[i]) + 1),
1300                                         pass_tokens[i], strlen(pass_tokens[i]));
1301                 add_ptr = add_ptr + strlen(user_tokens[i]) + 1 +
1302                                                 strlen(pass_tokens[i]) + 1;
1303         }
1304
1305         mb->cmd.length  = add_ptr + 1;
1306         mb->cmd.command = PPP_SET_INBOUND_AUTH;
1307
1308         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
1309
1310         if (err != CMD_OK)
1311                 ppp_error(card, err, mb);
1312
1313         return err;
1314 }
1315
1316
1317 /*============================================================================
1318  * Tokenize string.
1319  *      Parse a string of the following syntax:
1320  *              <arg1>,<arg2>,...
1321  *      and fill array of tokens with pointers to string elements.
1322  *
1323  */
1324 static int tokenize (char *str, char **tokens)
1325 {
1326         int cnt = 0;
1327
1328         tokens[0] = strsep(&str, "/");
1329         while (tokens[cnt] && (cnt < 32 - 1))
1330         {
1331                 tokens[cnt] = strstrip(tokens[cnt], " \t");
1332                 tokens[++cnt] = strsep(&str, "/");
1333         }
1334         return cnt;
1335 }
1336
1337 /*============================================================================
1338  * Strip leading and trailing spaces off the string str.
1339  */
1340 static char* strstrip (char *str, char* s)
1341 {
1342         char *eos = str + strlen(str);          /* -> end of string */
1343
1344         while (*str && strchr(s, *str))
1345                 ++str                           /* strip leading spaces */
1346         ;
1347         while ((eos > str) && strchr(s, *(eos - 1)))
1348                 --eos                           /* strip trailing spaces */
1349         ;
1350         *eos = '\0';
1351         return str;
1352 }
1353 /*============================================================================
1354  * Configure PPP firmware.
1355  */
1356 static int ppp_configure(sdla_t *card, void *data)
1357 {
1358         ppp_mbox_t *mb = card->mbox;
1359         int data_len = sizeof(ppp508_conf_t);
1360         int err;
1361
1362         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
1363         memcpy(mb->data, data, data_len);
1364         mb->cmd.length  = data_len;
1365         mb->cmd.command = PPP_SET_CONFIG;
1366         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
1367
1368         if (err != CMD_OK)
1369                 ppp_error(card, err, mb);
1370
1371         return err;
1372 }
1373
1374 /*============================================================================
1375  * Set interrupt mode.
1376  */
1377 static int ppp_set_intr_mode(sdla_t *card, unsigned char mode)
1378 {
1379         ppp_mbox_t *mb = card->mbox;
1380         ppp_intr_info_t *ppp_intr_data = (ppp_intr_info_t *) &mb->data[0];
1381         int err;
1382
1383         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
1384         ppp_intr_data->i_enable = mode;
1385
1386         ppp_intr_data->irq = card->hw.irq;
1387         mb->cmd.length = 2;
1388
1389        /* If timer has been enabled, set the timer delay to 1sec */
1390        if (mode & 0x80){
1391                 ppp_intr_data->timer_len = 250; //5;//100; //250;
1392                 mb->cmd.length = 4;
1393         }
1394
1395         mb->cmd.command = PPP_SET_INTR_FLAGS;
1396         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
1397
1398         if (err != CMD_OK)
1399                 ppp_error(card, err, mb);
1400
1401
1402         return err;
1403 }
1404
1405 /*============================================================================
1406  * Enable communications.
1407  */
1408 static int ppp_comm_enable(sdla_t *card)
1409 {
1410         ppp_mbox_t *mb = card->mbox;
1411         int err;
1412
1413         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
1414         mb->cmd.command = PPP_COMM_ENABLE;
1415         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
1416
1417         if (err != CMD_OK)
1418                 ppp_error(card, err, mb);
1419         else
1420                 card->u.p.comm_enabled = 1;
1421
1422         return err;
1423 }
1424
1425 /*============================================================================
1426  * Disable communications.
1427  */
1428 static int ppp_comm_disable(sdla_t *card)
1429 {
1430         ppp_mbox_t *mb = card->mbox;
1431         int err;
1432
1433         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
1434         mb->cmd.command = PPP_COMM_DISABLE;
1435         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
1436         if (err != CMD_OK)
1437                 ppp_error(card, err, mb);
1438         else
1439                 card->u.p.comm_enabled = 0;
1440
1441         return err;
1442 }
1443
1444 static int ppp_comm_disable_shutdown(sdla_t *card)
1445 {
1446         ppp_mbox_t *mb = card->mbox;
1447         ppp_intr_info_t *ppp_intr_data;
1448         int err;
1449
1450         if (!mb){
1451                 return 1;
1452         }
1453
1454         ppp_intr_data = (ppp_intr_info_t *) &mb->data[0];
1455
1456         /* Disable all interrupts */
1457         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
1458         ppp_intr_data->i_enable = 0;
1459
1460         ppp_intr_data->irq = card->hw.irq;
1461         mb->cmd.length = 2;
1462
1463         mb->cmd.command = PPP_SET_INTR_FLAGS;
1464         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
1465
1466         /* Disable communicatinons */
1467         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
1468         mb->cmd.command = PPP_COMM_DISABLE;
1469         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
1470
1471         card->u.p.comm_enabled = 0;
1472
1473         return 0;
1474 }
1475
1476
1477
1478 /*============================================================================
1479  * Get communications error statistics.
1480  */
1481 static int ppp_get_err_stats(sdla_t *card)
1482 {
1483         ppp_mbox_t *mb = card->mbox;
1484         int err;
1485
1486         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
1487         mb->cmd.command = PPP_READ_ERROR_STATS;
1488         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
1489
1490         if (err == CMD_OK) {
1491
1492                 ppp_err_stats_t* stats = (void*)mb->data;
1493                 card->wandev.stats.rx_over_errors    = stats->rx_overrun;
1494                 card->wandev.stats.rx_crc_errors     = stats->rx_bad_crc;
1495                 card->wandev.stats.rx_missed_errors  = stats->rx_abort;
1496                 card->wandev.stats.rx_length_errors  = stats->rx_lost;
1497                 card->wandev.stats.tx_aborted_errors = stats->tx_abort;
1498
1499         } else
1500                 ppp_error(card, err, mb);
1501
1502         return err;
1503 }
1504
1505 /*============================================================================
1506  * Send packet.
1507  *      Return: 0 - o.k.
1508  *              1 - no transmit buffers available
1509  */
1510 static int ppp_send (sdla_t *card, void *data, unsigned len, unsigned proto)
1511 {
1512         ppp_buf_ctl_t *txbuf = card->u.p.txbuf;
1513
1514         if (txbuf->flag)
1515                 return 1;
1516
1517         sdla_poke(&card->hw, txbuf->buf.ptr, data, len);
1518
1519         txbuf->length = len;            /* frame length */
1520
1521         if (proto == htons(ETH_P_IPX))
1522                 txbuf->proto = 0x01;    /* protocol ID */
1523         else
1524                 txbuf->proto = 0x00;    /* protocol ID */
1525
1526         txbuf->flag = 1;                /* start transmission */
1527
1528         /* Update transmit buffer control fields */
1529         card->u.p.txbuf = ++txbuf;
1530
1531         if ((void*)txbuf > card->u.p.txbuf_last)
1532                 card->u.p.txbuf = card->u.p.txbuf_base;
1533
1534         return 0;
1535 }
1536
1537 /****** Firmware Error Handler **********************************************/
1538
1539 /*============================================================================
1540  * Firmware error handler.
1541  *      This routine is called whenever firmware command returns non-zero
1542  *      return code.
1543  *
1544  * Return zero if previous command has to be cancelled.
1545  */
1546 static int ppp_error(sdla_t *card, int err, ppp_mbox_t *mb)
1547 {
1548         unsigned cmd = mb->cmd.command;
1549
1550         switch (err) {
1551
1552                 case CMD_TIMEOUT:
1553                         printk(KERN_ERR "%s: command 0x%02X timed out!\n",
1554                                 card->devname, cmd);
1555                         break;
1556
1557                 default:
1558                         printk(KERN_INFO "%s: command 0x%02X returned 0x%02X!\n"
1559                                 , card->devname, cmd, err);
1560         }
1561
1562         return 0;
1563 }
1564
1565 /****** Interrupt Handlers **************************************************/
1566
1567 /*============================================================================
1568  * PPP interrupt service routine.
1569  */
1570 static void wpp_isr (sdla_t *card)
1571 {
1572         ppp_flags_t *flags = card->flags;
1573         char *ptr = &flags->iflag;
1574         struct net_device *dev = card->wandev.dev;
1575         int i;
1576
1577         card->in_isr = 1;
1578         ++card->statistics.isr_entry;
1579
1580         if (!dev && flags->iflag != PPP_INTR_CMD){
1581                 card->in_isr = 0;
1582                 flags->iflag = 0;
1583                 return;
1584         }
1585
1586         if (test_bit(PERI_CRIT, (void*)&card->wandev.critical)) {
1587                 card->in_isr = 0;
1588                 flags->iflag = 0;
1589                 return;
1590         }
1591
1592
1593         if(card->hw.type != SDLA_S514){
1594                 if (test_bit(SEND_CRIT, (void*)&card->wandev.critical)) {
1595                         ++card->statistics.isr_already_critical;
1596                         printk (KERN_INFO "%s: Critical while in ISR!\n",
1597                                         card->devname);
1598                         card->in_isr = 0;
1599                         flags->iflag = 0;
1600                         return;
1601                 }
1602         }
1603
1604         switch (flags->iflag) {
1605
1606                 case PPP_INTR_RXRDY:    /* receive interrupt  0x01  (bit 0)*/
1607                         ++card->statistics.isr_rx;
1608                         rx_intr(card);
1609                         break;
1610
1611                 case PPP_INTR_TXRDY:    /* transmit interrupt  0x02 (bit 1)*/
1612                         ++card->statistics.isr_tx;
1613                         flags->imask &= ~PPP_INTR_TXRDY;
1614                         netif_wake_queue(dev);
1615                         break;
1616
1617                 case PPP_INTR_CMD:      /* interface command completed */
1618                         ++Intr_test_counter;
1619                         ++card->statistics.isr_intr_test;
1620                         break;
1621
1622                 case PPP_INTR_MODEM:    /* modem status change (DCD, CTS) 0x04 (bit 2)*/
1623                 case PPP_INTR_DISC:     /* Data link disconnected 0x10  (bit 4)*/
1624                 case PPP_INTR_OPEN:     /* Data link open 0x20  (bit 5)*/
1625                 case PPP_INTR_DROP_DTR: /* DTR drop timeout expired  0x40 bit 6 */
1626                         event_intr(card);
1627                         break;
1628
1629                 case PPP_INTR_TIMER:
1630                         timer_intr(card);
1631                         break;
1632
1633                 default:        /* unexpected interrupt */
1634                         ++card->statistics.isr_spurious;
1635                         printk(KERN_INFO "%s: spurious interrupt 0x%02X!\n",
1636                                 card->devname, flags->iflag);
1637                         printk(KERN_INFO "%s: ID Bytes = ",card->devname);
1638                         for(i = 0; i < 8; i ++)
1639                                 printk(KERN_INFO "0x%02X ", *(ptr + 0x28 + i));
1640                         printk(KERN_INFO "\n");
1641         }
1642
1643         card->in_isr = 0;
1644         flags->iflag = 0;
1645         return;
1646 }
1647
1648 /*============================================================================
1649  * Receive interrupt handler.
1650  */
1651 static void rx_intr(sdla_t *card)
1652 {
1653         ppp_buf_ctl_t *rxbuf = card->rxmb;
1654         struct net_device *dev = card->wandev.dev;
1655         ppp_private_area_t *ppp_priv_area;
1656         struct sk_buff *skb;
1657         unsigned len;
1658         void *buf;
1659         int i;
1660         ppp_flags_t *flags = card->flags;
1661         char *ptr = &flags->iflag;
1662         int udp_type;
1663
1664
1665         if (rxbuf->flag != 0x01) {
1666
1667                 printk(KERN_INFO
1668                         "%s: corrupted Rx buffer @ 0x%X, flag = 0x%02X!\n",
1669                         card->devname, (unsigned)rxbuf, rxbuf->flag);
1670
1671                 printk(KERN_INFO "%s: ID Bytes = ",card->devname);
1672
1673                 for(i = 0; i < 8; i ++)
1674                         printk(KERN_INFO "0x%02X ", *(ptr + 0x28 + i));
1675                 printk(KERN_INFO "\n");
1676
1677                 ++card->statistics.rx_intr_corrupt_rx_bfr;
1678
1679
1680                 /* Bug Fix: Mar 6 2000
1681                  * If we get a corrupted mailbox, it means that driver
1682                  * is out of sync with the firmware. There is no recovery.
1683                  * If we don't turn off all interrupts for this card
1684                  * the machine will crash.
1685                  */
1686                 printk(KERN_INFO "%s: Critical router failure ...!!!\n", card->devname);
1687                 printk(KERN_INFO "Please contact Sangoma Technologies !\n");
1688                 ppp_set_intr_mode(card,0);
1689                 return;
1690         }
1691
1692         if (dev && netif_running(dev) && dev->priv){
1693
1694                 len  = rxbuf->length;
1695                 ppp_priv_area = dev->priv;
1696
1697                 /* Allocate socket buffer */
1698                 skb = dev_alloc_skb(len);
1699
1700                 if (skb != NULL) {
1701
1702                         /* Copy data to the socket buffer */
1703                         unsigned addr = rxbuf->buf.ptr;
1704
1705                         if ((addr + len) > card->u.p.rx_top + 1) {
1706
1707                                 unsigned tmp = card->u.p.rx_top - addr + 1;
1708                                 buf = skb_put(skb, tmp);
1709                                 sdla_peek(&card->hw, addr, buf, tmp);
1710                                 addr = card->u.p.rx_base;
1711                                 len -= tmp;
1712                         }
1713                         buf = skb_put(skb, len);
1714                         sdla_peek(&card->hw, addr, buf, len);
1715
1716                         /* Decapsulate packet */
1717                         switch (rxbuf->proto) {
1718
1719                                 case 0x00:
1720                                         skb->protocol = htons(ETH_P_IP);
1721                                         break;
1722
1723                                 case 0x01:
1724                                         skb->protocol = htons(ETH_P_IPX);
1725                                         break;
1726                         }
1727
1728                         udp_type = udp_pkt_type( skb, card );
1729
1730                         if (udp_type == UDP_PTPIPE_TYPE){
1731
1732                                 /* Handle a UDP Request in Timer Interrupt */
1733                                 if(store_udp_mgmt_pkt(UDP_PKT_FRM_NETWORK, card, skb, dev,
1734                                                         ppp_priv_area)){
1735                                         flags->imask |= PPP_INTR_TIMER;
1736                                 }
1737                                 ++ppp_priv_area->rx_intr_stat.rx_intr_PIPE_request;
1738
1739
1740                         } else if (handle_IPXWAN(skb->data,card->devname,
1741                                                  ppp_priv_area->enable_IPX,
1742                                                  ppp_priv_area->network_number,
1743                                                  skb->protocol)) {
1744
1745                                 /* Handle an IPXWAN packet */
1746                                 if( ppp_priv_area->enable_IPX) {
1747
1748                                         /* Make sure we are not already sending */
1749                                         if (!test_bit(SEND_CRIT, &card->wandev.critical)){
1750                                                 ppp_send(card, skb->data, skb->len, htons(ETH_P_IPX));
1751                                         }
1752                                         dev_kfree_skb_any(skb);
1753
1754                                 } else {
1755                                         ++card->wandev.stats.rx_dropped;
1756                                 }
1757                         } else {
1758                                 /* Pass data up the protocol stack */
1759                                 skb->dev = dev;
1760                                 skb->mac.raw  = skb->data;
1761
1762                                 ++card->wandev.stats.rx_packets;
1763                                 card->wandev.stats.rx_bytes += skb->len;
1764                                 ++ppp_priv_area->rx_intr_stat.rx_intr_bfr_passed_to_stack;
1765                                 netif_rx(skb);
1766                                 dev->last_rx = jiffies;
1767                         }
1768
1769                 } else {
1770
1771                         if (net_ratelimit()){
1772                                 printk(KERN_INFO "%s: no socket buffers available!\n",
1773                                         card->devname);
1774                         }
1775                         ++card->wandev.stats.rx_dropped;
1776                         ++ppp_priv_area->rx_intr_stat.rx_intr_no_socket;
1777                 }
1778
1779         } else {
1780                 ++card->statistics.rx_intr_dev_not_started;
1781         }
1782
1783         /* Release buffer element and calculate a pointer to the next one */
1784         rxbuf->flag = 0x00;
1785         card->rxmb = ++rxbuf;
1786         if ((void*)rxbuf > card->u.p.rxbuf_last)
1787                 card->rxmb = card->u.p.rxbuf_base;
1788 }
1789
1790
1791 void event_intr (sdla_t *card)
1792 {
1793
1794         struct net_device* dev = card->wandev.dev;
1795         ppp_private_area_t* ppp_priv_area = dev->priv;
1796         volatile ppp_flags_t *flags = card->flags;
1797
1798         switch (flags->iflag){
1799
1800                 case PPP_INTR_MODEM:    /* modem status change (DCD, CTS) 0x04  (bit 2)*/
1801
1802                         if (net_ratelimit()){
1803                                 printk (KERN_INFO "%s: Modem status: DCD=%s CTS=%s\n",
1804                                         card->devname, DCD(flags->mstatus), CTS(flags->mstatus));
1805                         }
1806                         break;
1807
1808                 case PPP_INTR_DISC:     /* Data link disconnected 0x10  (bit 4)*/
1809
1810                         NEX_PRINTK (KERN_INFO "Data link disconnected intr Cause %X\n",
1811                                                flags->disc_cause);
1812
1813                         if (flags->disc_cause &
1814                                 (PPP_LOCAL_TERMINATION | PPP_DCD_CTS_DROP |
1815                                 PPP_REMOTE_TERMINATION)) {
1816
1817                                 if (card->u.p.ip_mode == WANOPT_PPP_PEER) {
1818                                         set_bit(0,&Read_connection_info);
1819                                 }
1820                                 wanpipe_set_state(card, WAN_DISCONNECTED);
1821
1822                                 show_disc_cause(card, flags->disc_cause);
1823                                 ppp_priv_area->timer_int_enabled |= TMR_INT_ENABLED_PPP_EVENT;
1824                                 flags->imask |= PPP_INTR_TIMER;
1825                                 trigger_ppp_poll(dev);
1826                         }
1827                         break;
1828
1829                 case PPP_INTR_OPEN:     /* Data link open 0x20  (bit 5)*/
1830
1831                         NEX_PRINTK (KERN_INFO "%s: PPP Link Open, LCP=%s IP=%s\n",
1832                                         card->devname,LCP(flags->lcp_state),
1833                                         IP(flags->ip_state));
1834
1835                         if (flags->lcp_state == 0x09 &&
1836                            (flags->ip_state == 0x09 || flags->ipx_state == 0x09)){
1837
1838                                 /* Initialize the polling timer and set the state
1839                                  * to WAN_CONNNECTED */
1840
1841
1842                                 /* BUG FIX: When the protocol restarts, during heavy
1843                                  * traffic, board tx buffers and driver tx buffers
1844                                  * can go out of sync.  This checks the condition
1845                                  * and if the tx buffers are out of sync, the
1846                                  * protocols are restarted.
1847                                  * I don't know why the board tx buffer is out
1848                                  * of sync. It could be that a packets is tx
1849                                  * while the link is down, but that is not
1850                                  * possible. The other possiblility is that the
1851                                  * firmware doesn't reinitialize properly.
1852                                  * FIXME: A better fix should be found.
1853                                  */
1854                                 if (detect_and_fix_tx_bug(card)){
1855
1856                                         ppp_comm_disable(card);
1857
1858                                         wanpipe_set_state(card, WAN_DISCONNECTED);
1859
1860                                         ppp_priv_area->timer_int_enabled |=
1861                                                 TMR_INT_ENABLED_PPP_EVENT;
1862                                         flags->imask |= PPP_INTR_TIMER;
1863                                         break;
1864                                 }
1865
1866                                 card->state_tick = jiffies;
1867                                 wanpipe_set_state(card, WAN_CONNECTED);
1868
1869                                 NEX_PRINTK(KERN_INFO "CON: L Tx: %lx  B Tx: %lx || L Rx %lx B Rx %lx\n",
1870                                         (unsigned long)card->u.p.txbuf, *card->u.p.txbuf_next,
1871                                         (unsigned long)card->rxmb, *card->u.p.rxbuf_next);
1872
1873                                 /* Tell timer interrupt that PPP event occurred */
1874                                 ppp_priv_area->timer_int_enabled |= TMR_INT_ENABLED_PPP_EVENT;
1875                                 flags->imask |= PPP_INTR_TIMER;
1876
1877                                 /* If we are in PEER mode, we must first obtain the
1878                                  * IP information and then go into the poll routine */
1879                                 if (card->u.p.ip_mode != WANOPT_PPP_PEER){
1880                                         trigger_ppp_poll(dev);
1881                                 }
1882                         }
1883                         break;
1884
1885                 case PPP_INTR_DROP_DTR:         /* DTR drop timeout expired  0x40 bit 6 */
1886
1887                         NEX_PRINTK(KERN_INFO "DTR Drop Timeout Interrrupt \n");
1888
1889                         if (card->u.p.ip_mode == WANOPT_PPP_PEER) {
1890                                 set_bit(0,&Read_connection_info);
1891                         }
1892
1893                         wanpipe_set_state(card, WAN_DISCONNECTED);
1894
1895                         show_disc_cause(card, flags->disc_cause);
1896                         ppp_priv_area->timer_int_enabled |= TMR_INT_ENABLED_PPP_EVENT;
1897                         flags->imask |= PPP_INTR_TIMER;
1898                         trigger_ppp_poll(dev);
1899                         break;
1900
1901                 default:
1902                         printk(KERN_INFO "%s: Error, Invalid PPP Event\n",card->devname);
1903         }
1904 }
1905
1906
1907
1908 /* TIMER INTERRUPT */
1909
1910 void timer_intr (sdla_t *card)
1911 {
1912
1913         struct net_device* dev = card->wandev.dev;
1914         ppp_private_area_t* ppp_priv_area = dev->priv;
1915         ppp_flags_t *flags = card->flags;
1916
1917
1918         if (ppp_priv_area->timer_int_enabled & TMR_INT_ENABLED_CONFIG){
1919                 if (!config_ppp(card)){
1920                         ppp_priv_area->timer_int_enabled &=
1921                                         ~TMR_INT_ENABLED_CONFIG;
1922                 }
1923         }
1924
1925         /* Update statistics */
1926         if (ppp_priv_area->timer_int_enabled & TMR_INT_ENABLED_UPDATE){
1927                 ppp_get_err_stats(card);
1928                 if(!(--ppp_priv_area->update_comms_stats)){
1929                         ppp_priv_area->timer_int_enabled &=
1930                                 ~TMR_INT_ENABLED_UPDATE;
1931                 }
1932         }
1933
1934         /* PPIPEMON UDP request */
1935
1936         if (ppp_priv_area->timer_int_enabled & TMR_INT_ENABLED_UDP){
1937                 process_udp_mgmt_pkt(card,dev, ppp_priv_area);
1938                 ppp_priv_area->timer_int_enabled &= ~TMR_INT_ENABLED_UDP;
1939         }
1940
1941         /* PPP Event */
1942         if (ppp_priv_area->timer_int_enabled & TMR_INT_ENABLED_PPP_EVENT){
1943
1944                 if (card->wandev.state == WAN_DISCONNECTED){
1945                         retrigger_comm(card);
1946                 }
1947
1948                 /* If the state is CONNECTING, it means that communicatins were
1949                  * enabled. When the remote side enables its comminication we
1950                  * should get an interrupt PPP_INTR_OPEN, thus turn off polling
1951                  */
1952
1953                 else if (card->wandev.state == WAN_CONNECTING){
1954                         /* Turn off the timer interrupt */
1955                         ppp_priv_area->timer_int_enabled &= ~TMR_INT_ENABLED_PPP_EVENT;
1956                 }
1957
1958                 /* If state is connected and we are in PEER mode
1959                  * poll for an IP address which will be provided by remote end.
1960                  */
1961                 else if ((card->wandev.state == WAN_CONNECTED &&
1962                           card->u.p.ip_mode == WANOPT_PPP_PEER) &&
1963                           test_bit(0,&Read_connection_info)){
1964
1965                         card->state_tick = jiffies;
1966                         if (read_connection_info (card)){
1967                                 printk(KERN_INFO "%s: Failed to read PEER IP Addresses\n",
1968                                         card->devname);
1969                         }else{
1970                                 clear_bit(0,&Read_connection_info);
1971                                 set_bit(1,&Read_connection_info);
1972                                 trigger_ppp_poll(dev);
1973                         }
1974                 }else{
1975                         //FIXME Put the comment back int
1976                         ppp_priv_area->timer_int_enabled &= ~TMR_INT_ENABLED_PPP_EVENT;
1977                 }
1978
1979         }/* End of PPP_EVENT */
1980
1981
1982         /* Only disable the timer interrupt if there are no udp, statistic */
1983         /* updates or events pending */
1984         if(!ppp_priv_area->timer_int_enabled) {
1985                 flags->imask &= ~PPP_INTR_TIMER;
1986         }
1987 }
1988
1989
1990 static int handle_IPXWAN(unsigned char *sendpacket, char *devname, unsigned char enable_IPX, unsigned long network_number, unsigned short proto)
1991 {
1992         int i;
1993
1994         if( proto == htons(ETH_P_IPX) ) {
1995                 //It's an IPX packet
1996                 if(!enable_IPX) {
1997                         //Return 1 so we don't pass it up the stack.
1998                         return 1;
1999                 }
2000         } else {
2001                 //It's not IPX so pass it up the stack.
2002                 return 0;
2003         }
2004
2005         if( sendpacket[16] == 0x90 &&
2006             sendpacket[17] == 0x04)
2007         {
2008                 //It's IPXWAN
2009
2010                 if( sendpacket[2] == 0x02 &&
2011                     sendpacket[34] == 0x00)
2012                 {
2013                         //It's a timer request packet
2014                         printk(KERN_INFO "%s: Received IPXWAN Timer Request packet\n",devname);
2015
2016                         //Go through the routing options and answer no to every
2017                         //option except Unnumbered RIP/SAP
2018                         for(i = 41; sendpacket[i] == 0x00; i += 5)
2019                         {
2020                                 //0x02 is the option for Unnumbered RIP/SAP
2021                                 if( sendpacket[i + 4] != 0x02)
2022                                 {
2023                                         sendpacket[i + 1] = 0;
2024                                 }
2025                         }
2026
2027                         //Skip over the extended Node ID option
2028                         if( sendpacket[i] == 0x04 )
2029                         {
2030                                 i += 8;
2031                         }
2032
2033                         //We also want to turn off all header compression opt.
2034                         for(; sendpacket[i] == 0x80 ;)
2035                         {
2036                                 sendpacket[i + 1] = 0;
2037                                 i += (sendpacket[i + 2] << 8) + (sendpacket[i + 3]) + 4;
2038                         }
2039
2040                         //Set the packet type to timer response
2041                         sendpacket[34] = 0x01;
2042
2043                         printk(KERN_INFO "%s: Sending IPXWAN Timer Response\n",devname);
2044                 }
2045                 else if( sendpacket[34] == 0x02 )
2046                 {
2047                         //This is an information request packet
2048                         printk(KERN_INFO "%s: Received IPXWAN Information Request packet\n",devname);
2049
2050                         //Set the packet type to information response
2051                         sendpacket[34] = 0x03;
2052
2053                         //Set the router name
2054                         sendpacket[51] = 'P';
2055                         sendpacket[52] = 'T';
2056                         sendpacket[53] = 'P';
2057                         sendpacket[54] = 'I';
2058                         sendpacket[55] = 'P';
2059                         sendpacket[56] = 'E';
2060                         sendpacket[57] = '-';
2061                         sendpacket[58] = CVHexToAscii(network_number >> 28);
2062                         sendpacket[59] = CVHexToAscii((network_number & 0x0F000000)>> 24);
2063                         sendpacket[60] = CVHexToAscii((network_number & 0x00F00000)>> 20);
2064                         sendpacket[61] = CVHexToAscii((network_number & 0x000F0000)>> 16);
2065                         sendpacket[62] = CVHexToAscii((network_number & 0x0000F000)>> 12);
2066                         sendpacket[63] = CVHexToAscii((network_number & 0x00000F00)>> 8);
2067                         sendpacket[64] = CVHexToAscii((network_number & 0x000000F0)>> 4);
2068                         sendpacket[65] = CVHexToAscii(network_number & 0x0000000F);
2069                         for(i = 66; i < 99; i+= 1)
2070                         {
2071                                 sendpacket[i] = 0;
2072                         }
2073
2074                         printk(KERN_INFO "%s: Sending IPXWAN Information Response packet\n",devname);
2075                 }
2076                 else
2077                 {
2078                         printk(KERN_INFO "%s: Unknown IPXWAN packet!\n",devname);
2079                         return 0;
2080                 }
2081
2082                 //Set the WNodeID to our network address
2083                 sendpacket[35] = (unsigned char)(network_number >> 24);
2084                 sendpacket[36] = (unsigned char)((network_number & 0x00FF0000) >> 16);
2085                 sendpacket[37] = (unsigned char)((network_number & 0x0000FF00) >> 8);
2086                 sendpacket[38] = (unsigned char)(network_number & 0x000000FF);
2087
2088                 return 1;
2089         } else {
2090                 //If we get here it's an IPX-data packet, so it'll get passed up the stack.
2091
2092                 //switch the network numbers
2093                 switch_net_numbers(sendpacket, network_number, 1);
2094                 return 0;
2095         }
2096 }
2097
2098 /****** Background Polling Routines  ****************************************/
2099
2100 /* All polling functions are invoked by the TIMER interrupt in the wpp_isr
2101  * routine.
2102  */
2103
2104 /*============================================================================
2105  * Monitor active link phase.
2106  */
2107 static void process_route (sdla_t *card)
2108 {
2109         ppp_flags_t *flags = card->flags;
2110         struct net_device *dev = card->wandev.dev;
2111         ppp_private_area_t *ppp_priv_area = dev->priv;
2112
2113         if ((card->u.p.ip_mode == WANOPT_PPP_PEER) &&
2114             (flags->ip_state == 0x09)){
2115
2116                 /* We get ip_local from the firmware in PEER mode.
2117                  * Therefore, if ip_local is 0, we failed to obtain
2118                  * the remote IP address. */
2119                 if (ppp_priv_area->ip_local == 0)
2120                         return;
2121
2122                 printk(KERN_INFO "%s: IPCP State Opened.\n", card->devname);
2123                 if (read_info( card )) {
2124                         printk(KERN_INFO
2125                                 "%s: An error occurred in IP assignment.\n",
2126                                 card->devname);
2127                 } else {
2128                         struct in_device *in_dev = dev->ip_ptr;
2129                         if (in_dev != NULL ) {
2130                                 struct in_ifaddr *ifa = in_dev->ifa_list;
2131
2132                                 printk(KERN_INFO "%s: Assigned Lcl. Addr: %u.%u.%u.%u\n",
2133                                         card->devname, NIPQUAD(ifa->ifa_local));
2134                                 printk(KERN_INFO "%s: Assigned Rmt. Addr: %u.%u.%u.%u\n",
2135                                                 card->devname, NIPQUAD(ifa->ifa_address));
2136                         }else{
2137                                 printk(KERN_INFO
2138                                 "%s: Error: Failed to add a route for PPP interface %s\n",
2139                                         card->devname,dev->name);
2140                         }
2141                 }
2142         }
2143 }
2144
2145 /*============================================================================
2146  * Monitor physical link disconnected phase.
2147  *  o if interface is up and the hold-down timeout has expired, then retry
2148  *    connection.
2149  */
2150 static void retrigger_comm(sdla_t *card)
2151 {
2152         struct net_device *dev = card->wandev.dev;
2153
2154         if (dev && ((jiffies - card->state_tick) > HOLD_DOWN_TIME)) {
2155
2156                 wanpipe_set_state(card, WAN_CONNECTING);
2157
2158                 if(ppp_comm_enable(card) == CMD_OK){
2159                         init_ppp_tx_rx_buff( card );
2160                 }
2161         }
2162 }
2163
2164 /****** Miscellaneous Functions *********************************************/
2165
2166 /*============================================================================
2167  * Configure S508 adapter.
2168  */
2169 static int config508(struct net_device *dev, sdla_t *card)
2170 {
2171         ppp508_conf_t cfg;
2172         struct in_device *in_dev = dev->ip_ptr;
2173         ppp_private_area_t *ppp_priv_area = dev->priv;
2174
2175         /* Prepare PPP configuration structure */
2176         memset(&cfg, 0, sizeof(ppp508_conf_t));
2177
2178         if (card->wandev.clocking)
2179                 cfg.line_speed = card->wandev.bps;
2180
2181         if (card->wandev.interface == WANOPT_RS232)
2182                 cfg.conf_flags |= INTERFACE_LEVEL_RS232;
2183
2184
2185         cfg.conf_flags  |= DONT_TERMINATE_LNK_MAX_CONFIG; /*send Configure-Request packets forever*/
2186         cfg.txbuf_percent       = PERCENT_TX_BUFF;      /* % of Tx bufs */
2187         cfg.mtu_local           = card->wandev.mtu;
2188         cfg.mtu_remote          = card->wandev.mtu;                  /*    Default   */
2189         cfg.restart_tmr         = TIME_BETWEEN_CONF_REQ;             /*    30 = 3sec */
2190         cfg.auth_rsrt_tmr       = TIME_BETWEEN_PAP_CHAP_REQ;         /*    30 = 3sec */
2191         cfg.auth_wait_tmr       = WAIT_PAP_CHAP_WITHOUT_REPLY;       /*   300 = 30s  */
2192         cfg.mdm_fail_tmr        = WAIT_AFTER_DCD_CTS_LOW;            /*     5 = 0.5s */
2193         cfg.dtr_drop_tmr        = TIME_DCD_CTS_LOW_AFTER_LNK_DOWN;   /*    10 = 1s   */
2194         cfg.connect_tmout       = WAIT_DCD_HIGH_AFTER_ENABLE_COMM;   /*   900 = 90s  */
2195         cfg.conf_retry          = MAX_CONF_REQ_WITHOUT_REPLY;        /*    10 = 1s   */
2196         cfg.term_retry          = MAX_TERM_REQ_WITHOUT_REPLY;        /*     2 times  */
2197         cfg.fail_retry          = NUM_CONF_NAK_WITHOUT_REPLY;        /*     5 times  */
2198         cfg.auth_retry          = NUM_AUTH_REQ_WITHOUT_REPLY;        /*     10 times */
2199
2200
2201         if( !card->u.p.authenticator ) {
2202                 printk(KERN_INFO "%s: Device is not configured as an authenticator\n",
2203                                 card->devname);
2204                 cfg.auth_options = NO_AUTHENTICATION;
2205         }else{
2206                 printk(KERN_INFO "%s: Device is configured as an authenticator\n",
2207                                 card->devname);
2208                 cfg.auth_options = INBOUND_AUTH;
2209         }
2210
2211         if( ppp_priv_area->pap == WANOPT_YES){
2212                 cfg.auth_options |=PAP_AUTH;
2213                 printk(KERN_INFO "%s: Pap enabled\n", card->devname);
2214         }
2215         if( ppp_priv_area->chap == WANOPT_YES){
2216                 cfg.auth_options |= CHAP_AUTH;
2217                 printk(KERN_INFO "%s: Chap enabled\n", card->devname);
2218         }
2219
2220
2221         if (ppp_priv_area->enable_IPX == WANOPT_YES){
2222                 printk(KERN_INFO "%s: Enabling IPX Protocol\n",card->devname);
2223                 cfg.ipx_options         = ENABLE_IPX | ROUTING_PROT_DEFAULT;
2224         }else{
2225                 cfg.ipx_options         = DISABLE_IPX;
2226         }
2227
2228         switch (card->u.p.ip_mode) {
2229
2230                 case WANOPT_PPP_STATIC:
2231
2232                         printk(KERN_INFO "%s: PPP IP Mode: STATIC\n",card->devname);
2233                         cfg.ip_options          = L_AND_R_IP_NO_ASSIG |
2234                                                             ENABLE_IP;
2235                         cfg.ip_local            = in_dev->ifa_list->ifa_local;
2236                         cfg.ip_remote           = in_dev->ifa_list->ifa_address;
2237                         /* Debugging code used to check that IP addresses
2238                          * obtained from the kernel are correct */
2239
2240                         NEX_PRINTK(KERN_INFO "Local %u.%u.%u.%u Remote %u.%u.%u.%u Name %s\n",
2241                                         NIPQUAD(ip_local),NIPQUAD(ip_remote), dev->name);
2242                         break;
2243
2244                 case WANOPT_PPP_HOST:
2245
2246                         printk(KERN_INFO "%s: PPP IP Mode: HOST\n",card->devname);
2247                         cfg.ip_options          = L_IP_LOCAL_ASSIG |
2248                                                   R_IP_LOCAL_ASSIG |
2249                                                   ENABLE_IP;
2250                         cfg.ip_local            = in_dev->ifa_list->ifa_local;
2251                         cfg.ip_remote           = in_dev->ifa_list->ifa_address;
2252                         /* Debugging code used to check that IP addresses
2253                          * obtained from the kernel are correct */
2254                         NEX_PRINTK (KERN_INFO "Local %u.%u.%u.%u Remote %u.%u.%u.%u Name %s\n",
2255                                         NIPQUAD(ip_local),NIPQUAD(ip_remote), dev->name);
2256
2257                         break;
2258
2259                 case WANOPT_PPP_PEER:
2260
2261                         printk(KERN_INFO "%s: PPP IP Mode: PEER\n",card->devname);
2262                         cfg.ip_options          = L_IP_REMOTE_ASSIG |
2263                                                   R_IP_REMOTE_ASSIG |
2264                                                           ENABLE_IP;
2265                         cfg.ip_local            = 0x00;
2266                         cfg.ip_remote           = 0x00;
2267                         break;
2268
2269                 default:
2270                         printk(KERN_INFO "%s: ERROR: Unsupported PPP Mode Selected\n",
2271                                         card->devname);
2272                         printk(KERN_INFO "%s:        PPP IP Modes: STATIC, PEER or HOST\n",
2273                                         card->devname);
2274                         return 1;
2275         }
2276
2277         return ppp_configure(card, &cfg);
2278 }
2279
2280 /*============================================================================
2281  * Show disconnection cause.
2282  */
2283 static void show_disc_cause(sdla_t *card, unsigned cause)
2284 {
2285         if (cause & 0x0802)
2286
2287                 printk(KERN_INFO "%s: link terminated by peer\n",
2288                         card->devname);
2289
2290         else if (cause & 0x0004)
2291
2292                 printk(KERN_INFO "%s: link terminated by user\n",
2293                         card->devname);
2294
2295         else if (cause & 0x0008)
2296
2297                 printk(KERN_INFO "%s: authentication failed\n", card->devname);
2298
2299         else if (cause & 0x0010)
2300
2301                 printk(KERN_INFO
2302                         "%s: authentication protocol negotiation failed\n",
2303                         card->devname);
2304
2305         else if (cause & 0x0020)
2306
2307                 printk(KERN_INFO
2308                 "%s: peer's request for authentication rejected\n",
2309                 card->devname);
2310
2311         else if (cause & 0x0040)
2312
2313                 printk(KERN_INFO "%s: MRU option rejected by peer\n",
2314                 card->devname);
2315
2316         else if (cause & 0x0080)
2317
2318                 printk(KERN_INFO "%s: peer's MRU was too small\n",
2319                 card->devname);
2320
2321         else if (cause & 0x0100)
2322
2323                 printk(KERN_INFO "%s: failed to negotiate peer's LCP options\n",
2324                 card->devname);
2325
2326         else if (cause & 0x0200)
2327
2328                 printk(KERN_INFO "%s: failed to negotiate peer's IPCP options\n"
2329                 , card->devname);
2330
2331         else if (cause & 0x0400)
2332
2333                 printk(KERN_INFO
2334                         "%s: failed to negotiate peer's IPXCP options\n",
2335                         card->devname);
2336 }
2337
2338 /*=============================================================================
2339  * Process UDP call of type PTPIPEAB.
2340  */
2341 static void process_udp_mgmt_pkt(sdla_t *card, struct net_device *dev,
2342                                  ppp_private_area_t *ppp_priv_area )
2343 {
2344         unsigned char buf2[5];
2345         unsigned char *buf;
2346         unsigned int frames, len;
2347         struct sk_buff *new_skb;
2348         unsigned short data_length, buffer_length, real_len;
2349         unsigned long data_ptr;
2350         int udp_mgmt_req_valid = 1;
2351         ppp_mbox_t *mbox = card->mbox;
2352         struct timeval tv;
2353         int err;
2354         ppp_udp_pkt_t *ppp_udp_pkt = (ppp_udp_pkt_t*)&ppp_priv_area->udp_pkt_data;
2355
2356         memcpy(&buf2, &card->wandev.udp_port, 2 );
2357
2358
2359         if(ppp_priv_area->udp_pkt_src == UDP_PKT_FRM_NETWORK) {
2360
2361                 switch(ppp_udp_pkt->cblock.command) {
2362
2363                         case PPIPE_GET_IBA_DATA:
2364                         case PPP_READ_CONFIG:
2365                         case PPP_GET_CONNECTION_INFO:
2366                         case PPIPE_ROUTER_UP_TIME:
2367                         case PPP_READ_STATISTICS:
2368                         case PPP_READ_ERROR_STATS:
2369                         case PPP_READ_PACKET_STATS:
2370                         case PPP_READ_LCP_STATS:
2371                         case PPP_READ_IPCP_STATS:
2372                         case PPP_READ_IPXCP_STATS:
2373                         case PPP_READ_PAP_STATS:
2374                         case PPP_READ_CHAP_STATS:
2375                         case PPP_READ_CODE_VERSION:
2376                                 udp_mgmt_req_valid = 1;
2377                                 break;
2378
2379                         default:
2380                                 udp_mgmt_req_valid = 0;
2381                                 break;
2382                 }
2383         }
2384
2385         if(!udp_mgmt_req_valid) {
2386
2387                 /* set length to 0 */
2388                 ppp_udp_pkt->cblock.length = 0x00;
2389
2390                 /* set return code */
2391                 ppp_udp_pkt->cblock.result = 0xCD;
2392                 ++ppp_priv_area->pipe_mgmt_stat.UDP_PIPE_mgmt_direction_err;
2393
2394                 if (net_ratelimit()){
2395                         printk(KERN_INFO
2396                         "%s: Warning, Illegal UDP command attempted from network: %x\n",
2397                         card->devname,ppp_udp_pkt->cblock.command);
2398                 }
2399         } else {
2400                 /* Initialize the trace element */
2401                 trace_element_t trace_element;
2402
2403                 switch (ppp_udp_pkt->cblock.command){
2404
2405                 /* PPIPE_ENABLE_TRACING */
2406                 case PPIPE_ENABLE_TRACING:
2407                         if (!card->TracingEnabled) {
2408
2409                                 /* OPERATE_DATALINE_MONITOR */
2410                                 mbox->cmd.command = PPP_DATALINE_MONITOR;
2411                                 mbox->cmd.length = 0x01;
2412                                 mbox->data[0] = ppp_udp_pkt->data[0];
2413                                 err = sdla_exec(mbox) ?
2414                                         mbox->cmd.result : CMD_TIMEOUT;
2415
2416                                 if (err != CMD_OK) {
2417
2418                                         ppp_error(card, err, mbox);
2419                                         card->TracingEnabled = 0;
2420
2421                                         /* set the return code */
2422
2423                                         ppp_udp_pkt->cblock.result = mbox->cmd.result;
2424                                         mbox->cmd.length = 0;
2425                                         break;
2426                                 }
2427
2428                                 sdla_peek(&card->hw, 0xC000, &buf2, 2);
2429
2430                                 ppp_priv_area->curr_trace_addr = 0;
2431                                 memcpy(&ppp_priv_area->curr_trace_addr, &buf2, 2);
2432                                 ppp_priv_area->start_trace_addr =
2433                                                 ppp_priv_area->curr_trace_addr;
2434                                 ppp_priv_area->end_trace_addr =
2435                                         ppp_priv_area->start_trace_addr + END_OFFSET;
2436
2437                                 /* MAX_SEND_BUFFER_SIZE - 28 (IP header)
2438                                    - 32 (ppipemon CBLOCK) */
2439                                 available_buffer_space = MAX_LGTH_UDP_MGNT_PKT -
2440                                                          sizeof(ip_pkt_t)-
2441                                                          sizeof(udp_pkt_t)-
2442                                                          sizeof(wp_mgmt_t)-
2443                                                          sizeof(cblock_t);
2444                         }
2445                         ppp_udp_pkt->cblock.result = 0;
2446                         mbox->cmd.length = 0;
2447                         card->TracingEnabled = 1;
2448                         break;
2449
2450                 /* PPIPE_DISABLE_TRACING */
2451                 case PPIPE_DISABLE_TRACING:
2452
2453                         if(card->TracingEnabled) {
2454
2455                                 /* OPERATE_DATALINE_MONITOR */
2456                                 mbox->cmd.command = 0x33;
2457                                 mbox->cmd.length = 1;
2458                                 mbox->data[0] = 0x00;
2459                                 err = sdla_exec(mbox) ?
2460                                         mbox->cmd.result : CMD_TIMEOUT;
2461
2462                         }
2463
2464                         /*set return code*/
2465                         ppp_udp_pkt->cblock.result = 0;
2466                         mbox->cmd.length = 0;
2467                         card->TracingEnabled = 0;
2468                         break;
2469
2470                 /* PPIPE_GET_TRACE_INFO */
2471                 case PPIPE_GET_TRACE_INFO:
2472
2473                         if(!card->TracingEnabled) {
2474                                 /* set return code */
2475                                 ppp_udp_pkt->cblock.result = 1;
2476                                 mbox->cmd.length = 0;
2477                         }
2478
2479                         buffer_length = 0;
2480
2481                         /* frames < 62, where 62 is the number of trace
2482                            information elements.  There is in total 496
2483                            bytes of space and each trace information
2484                            element is 8 bytes.
2485                          */
2486                         for ( frames=0; frames<62; frames++) {
2487
2488                                 trace_pkt_t *trace_pkt = (trace_pkt_t *)
2489                                         &ppp_udp_pkt->data[buffer_length];
2490
2491                                 /* Read the whole trace packet */
2492                                 sdla_peek(&card->hw, ppp_priv_area->curr_trace_addr,
2493                                           &trace_element, sizeof(trace_element_t));
2494
2495                                 /* no data on board so exit */
2496                                 if( trace_element.opp_flag == 0x00 )
2497                                         break;
2498
2499                                 data_ptr = trace_element.trace_data_ptr;
2500
2501                                 /* See if there is actual data on the trace buffer */
2502                                 if (data_ptr){
2503                                         data_length = trace_element.trace_length;
2504                                 }else{
2505                                         data_length = 0;
2506                                         ppp_udp_pkt->data[0] |= 0x02;
2507                                 }
2508
2509                                 //FIXME: Do we need this check
2510                                 if ((available_buffer_space - buffer_length)
2511                                      < (sizeof(trace_element_t)+1)){
2512
2513                                         /*indicate we have more frames
2514                                          * on board and exit
2515                                          */
2516                                         ppp_udp_pkt->data[0] |= 0x02;
2517                                         break;
2518                                 }
2519
2520                                 trace_pkt->status = trace_element.trace_type;
2521                                 trace_pkt->time_stamp = trace_element.trace_time_stamp;
2522                                 trace_pkt->real_length = trace_element.trace_length;
2523
2524                                 real_len = trace_element.trace_length;
2525
2526                                 if(data_ptr == 0){
2527                                         trace_pkt->data_avail = 0x00;
2528                                 }else{
2529                                         /* we can take it next time */
2530                                         if ((available_buffer_space - buffer_length)<
2531                                                 (real_len + sizeof(trace_pkt_t))){
2532
2533                                                 ppp_udp_pkt->data[0] |= 0x02;
2534                                                 break;
2535                                         }
2536                                         trace_pkt->data_avail = 0x01;
2537
2538                                         /* get the data */
2539                                         sdla_peek(&card->hw, data_ptr,
2540                                                   &trace_pkt->data,
2541                                                   real_len);
2542                                 }
2543                                 /* zero the opp flag to
2544                                    show we got the frame */
2545                                 buf2[0] = 0x00;
2546                                 sdla_poke(&card->hw, ppp_priv_area->curr_trace_addr,
2547                                           &buf2, 1);
2548
2549                                 /* now move onto the next
2550                                    frame */
2551                                 ppp_priv_area->curr_trace_addr += 8;
2552
2553                                 /* check if we passed the last address */
2554                                 if ( ppp_priv_area->curr_trace_addr >=
2555                                         ppp_priv_area->end_trace_addr){
2556
2557                                         ppp_priv_area->curr_trace_addr =
2558                                                 ppp_priv_area->start_trace_addr;
2559                                 }
2560
2561                                 /* update buffer length and make sure its even */
2562
2563                                 if ( trace_pkt->data_avail == 0x01 ) {
2564                                         buffer_length += real_len - 1;
2565                                 }
2566
2567                                 /* for the header */
2568                                 buffer_length += 8;
2569
2570                                 if( buffer_length & 0x0001 )
2571                                         buffer_length += 1;
2572                         }
2573
2574                         /* ok now set the total number of frames passed
2575                            in the high 5 bits */
2576                         ppp_udp_pkt->data[0] |= (frames << 2);
2577
2578                         /* set the data length */
2579                         mbox->cmd.length = buffer_length;
2580                         ppp_udp_pkt->cblock.length = buffer_length;
2581
2582                         /* set return code */
2583                         ppp_udp_pkt->cblock.result = 0;
2584                         break;
2585
2586                 /* PPIPE_GET_IBA_DATA */
2587                 case PPIPE_GET_IBA_DATA:
2588
2589                         mbox->cmd.length = 0x09;
2590
2591                         sdla_peek(&card->hw, 0xF003, &ppp_udp_pkt->data,
2592                                         mbox->cmd.length);
2593
2594                         /* set the length of the data */
2595                         ppp_udp_pkt->cblock.length = 0x09;
2596
2597                         /* set return code */
2598                         ppp_udp_pkt->cblock.result = 0x00;
2599                         ppp_udp_pkt->cblock.result = 0;
2600                         break;
2601
2602                 /* PPIPE_FT1_READ_STATUS */
2603                 case PPIPE_FT1_READ_STATUS:
2604                         sdla_peek(&card->hw, 0xF020, &ppp_udp_pkt->data[0], 2);
2605                         ppp_udp_pkt->cblock.length = mbox->cmd.length = 2;
2606                         ppp_udp_pkt->cblock.result = 0;
2607                         break;
2608
2609                 case PPIPE_FLUSH_DRIVER_STATS:
2610                         init_ppp_priv_struct( ppp_priv_area );
2611                         init_global_statistics( card );
2612                         mbox->cmd.length = 0;
2613                         ppp_udp_pkt->cblock.result = 0;
2614                         break;
2615
2616
2617                 case PPIPE_ROUTER_UP_TIME:
2618
2619                         do_gettimeofday( &tv );
2620                         ppp_priv_area->router_up_time = tv.tv_sec -
2621                                         ppp_priv_area->router_start_time;
2622                         *(unsigned long *)&ppp_udp_pkt->data = ppp_priv_area->router_up_time;
2623                         mbox->cmd.length = 4;
2624                         ppp_udp_pkt->cblock.result = 0;
2625                         break;
2626
2627                                 /* PPIPE_DRIVER_STATISTICS */
2628                 case PPIPE_DRIVER_STAT_IFSEND:
2629                         memcpy(&ppp_udp_pkt->data, &ppp_priv_area->if_send_stat,
2630                                 sizeof(if_send_stat_t));
2631
2632
2633                         ppp_udp_pkt->cblock.result = 0;
2634                         ppp_udp_pkt->cblock.length = sizeof(if_send_stat_t);
2635                         mbox->cmd.length = sizeof(if_send_stat_t);
2636                         break;
2637
2638                 case PPIPE_DRIVER_STAT_INTR:
2639                         memcpy(&ppp_udp_pkt->data, &card->statistics,
2640                                 sizeof(global_stats_t));
2641
2642                         memcpy(&ppp_udp_pkt->data+sizeof(global_stats_t),
2643                                 &ppp_priv_area->rx_intr_stat,
2644                                 sizeof(rx_intr_stat_t));
2645
2646                         ppp_udp_pkt->cblock.result = 0;
2647                         ppp_udp_pkt->cblock.length = sizeof(global_stats_t)+
2648                                                      sizeof(rx_intr_stat_t);
2649                         mbox->cmd.length = ppp_udp_pkt->cblock.length;
2650                         break;
2651
2652                 case PPIPE_DRIVER_STAT_GEN:
2653                         memcpy( &ppp_udp_pkt->data,
2654                                 &ppp_priv_area->pipe_mgmt_stat,
2655                                 sizeof(pipe_mgmt_stat_t));
2656
2657                         memcpy(&ppp_udp_pkt->data+sizeof(pipe_mgmt_stat_t),
2658                                &card->statistics, sizeof(global_stats_t));
2659
2660                         ppp_udp_pkt->cblock.result = 0;
2661                         ppp_udp_pkt->cblock.length = sizeof(global_stats_t)+
2662                                                      sizeof(rx_intr_stat_t);
2663                         mbox->cmd.length = ppp_udp_pkt->cblock.length;
2664                         break;
2665
2666
2667                 /* FT1 MONITOR STATUS */
2668                 case FT1_MONITOR_STATUS_CTRL:
2669
2670                         /* Enable FT1 MONITOR STATUS */
2671                         if( ppp_udp_pkt->data[0] == 1) {
2672
2673                                 if( rCount++ != 0 ) {
2674                                         ppp_udp_pkt->cblock.result = 0;
2675                                         mbox->cmd.length = 1;
2676                                         break;
2677                                 }
2678                         }
2679
2680                         /* Disable FT1 MONITOR STATUS */
2681                         if( ppp_udp_pkt->data[0] == 0) {
2682
2683                                 if( --rCount != 0) {
2684                                         ppp_udp_pkt->cblock.result = 0;
2685                                         mbox->cmd.length = 1;
2686                                         break;
2687                                 }
2688                         }
2689                         goto udp_dflt_cmd;
2690
2691                 /* WARNING: FIXME: This should be fixed.
2692                  * The FT1 Status Ctrl doesn't have a break
2693                  * statment.  Thus, no code must be inserted
2694                  * HERE: between default and above case statement */
2695
2696                 default:
2697 udp_dflt_cmd:
2698
2699                         /* it's a board command */
2700                         mbox->cmd.command = ppp_udp_pkt->cblock.command;
2701                         mbox->cmd.length = ppp_udp_pkt->cblock.length;
2702
2703                         if(mbox->cmd.length) {
2704                                 memcpy(&mbox->data,(unsigned char *)ppp_udp_pkt->data,
2705                                        mbox->cmd.length);
2706                         }
2707
2708                         /* run the command on the board */
2709                         err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
2710
2711                         if (err != CMD_OK) {
2712
2713                                 ppp_error(card, err, mbox);
2714                                 ++ppp_priv_area->pipe_mgmt_stat.
2715                                          UDP_PIPE_mgmt_adptr_cmnd_timeout;
2716                                 break;
2717                         }
2718
2719                         ++ppp_priv_area->pipe_mgmt_stat.UDP_PIPE_mgmt_adptr_cmnd_OK;
2720
2721                         /* copy the result back to our buffer */
2722                         memcpy(&ppp_udp_pkt->cblock,mbox, sizeof(cblock_t));
2723
2724                         if(mbox->cmd.length) {
2725                                 memcpy(&ppp_udp_pkt->data,&mbox->data,mbox->cmd.length);
2726                         }
2727
2728                 } /* end of switch */
2729         } /* end of else */
2730
2731         /* Fill UDP TTL */
2732         ppp_udp_pkt->ip_pkt.ttl = card->wandev.ttl;
2733         len = reply_udp(ppp_priv_area->udp_pkt_data, mbox->cmd.length);
2734
2735         if (ppp_priv_area->udp_pkt_src == UDP_PKT_FRM_NETWORK) {
2736
2737                 /* Make sure we are not already sending */
2738                 if (!test_bit(SEND_CRIT,&card->wandev.critical)){
2739                         ++ppp_priv_area->pipe_mgmt_stat.UDP_PIPE_mgmt_passed_to_adptr;
2740                         ppp_send(card,ppp_priv_area->udp_pkt_data,len,ppp_priv_area->protocol);
2741                 }
2742
2743         } else {
2744
2745                 /* Pass it up the stack
2746                    Allocate socket buffer */
2747                 if ((new_skb = dev_alloc_skb(len)) != NULL) {
2748
2749                         /* copy data into new_skb */
2750
2751                         buf = skb_put(new_skb, len);
2752                         memcpy(buf,ppp_priv_area->udp_pkt_data, len);
2753
2754                         ++ppp_priv_area->pipe_mgmt_stat.UDP_PIPE_mgmt_passed_to_stack;
2755
2756                         /* Decapsulate packet and pass it up the protocol
2757                            stack */
2758                         new_skb->protocol = htons(ETH_P_IP);
2759                         new_skb->dev = dev;
2760                         new_skb->mac.raw  = new_skb->data;
2761                         netif_rx(new_skb);
2762                         dev->last_rx = jiffies;
2763
2764                 } else {
2765
2766                         ++ppp_priv_area->pipe_mgmt_stat.UDP_PIPE_mgmt_no_socket;
2767                         printk(KERN_INFO "no socket buffers available!\n");
2768                 }
2769         }
2770
2771         ppp_priv_area->udp_pkt_lgth = 0;
2772
2773         return;
2774 }
2775
2776 /*=============================================================================
2777  * Initial the ppp_private_area structure.
2778  */
2779 static void init_ppp_priv_struct( ppp_private_area_t *ppp_priv_area )
2780 {
2781
2782         memset(&ppp_priv_area->if_send_stat, 0, sizeof(if_send_stat_t));
2783         memset(&ppp_priv_area->rx_intr_stat, 0, sizeof(rx_intr_stat_t));
2784         memset(&ppp_priv_area->pipe_mgmt_stat, 0, sizeof(pipe_mgmt_stat_t));
2785 }
2786
2787 /*============================================================================
2788  * Initialize Global Statistics
2789  */
2790 static void init_global_statistics( sdla_t *card )
2791 {
2792         memset(&card->statistics, 0, sizeof(global_stats_t));
2793 }
2794
2795 /*============================================================================
2796  * Initialize Receive and Transmit Buffers.
2797  */
2798 static void init_ppp_tx_rx_buff( sdla_t *card )
2799 {
2800         ppp508_buf_info_t* info;
2801
2802         if (card->hw.type == SDLA_S514) {
2803
2804                 info = (void*)(card->hw.dpmbase + PPP514_BUF_OFFS);
2805
2806                 card->u.p.txbuf_base = (void*)(card->hw.dpmbase +
2807                         info->txb_ptr);
2808
2809                 card->u.p.txbuf_last = (ppp_buf_ctl_t*)card->u.p.txbuf_base +
2810                         (info->txb_num - 1);
2811
2812                 card->u.p.rxbuf_base = (void*)(card->hw.dpmbase +
2813                         info->rxb_ptr);
2814
2815                 card->u.p.rxbuf_last = (ppp_buf_ctl_t*)card->u.p.rxbuf_base +
2816                         (info->rxb_num - 1);
2817
2818         } else {
2819
2820                 info = (void*)(card->hw.dpmbase + PPP508_BUF_OFFS);
2821
2822                 card->u.p.txbuf_base = (void*)(card->hw.dpmbase +
2823                         (info->txb_ptr - PPP508_MB_VECT));
2824
2825                 card->u.p.txbuf_last = (ppp_buf_ctl_t*)card->u.p.txbuf_base +
2826                         (info->txb_num - 1);
2827
2828                 card->u.p.rxbuf_base = (void*)(card->hw.dpmbase +
2829                         (info->rxb_ptr - PPP508_MB_VECT));
2830
2831                 card->u.p.rxbuf_last = (ppp_buf_ctl_t*)card->u.p.rxbuf_base +
2832                         (info->rxb_num - 1);
2833         }
2834
2835         card->u.p.txbuf_next = (unsigned long*)&info->txb_nxt;
2836         card->u.p.rxbuf_next = (unsigned long*)&info->rxb1_ptr;
2837
2838         card->u.p.rx_base = info->rxb_base;
2839         card->u.p.rx_top  = info->rxb_end;
2840
2841         card->u.p.txbuf = card->u.p.txbuf_base;
2842         card->rxmb = card->u.p.rxbuf_base;
2843
2844 }
2845
2846 /*=============================================================================
2847  * Read Connection Information (ie for Remote IP address assginment).
2848  * Called when ppp interface connected.
2849  */
2850 static int read_info( sdla_t *card )
2851 {
2852         struct net_device *dev = card->wandev.dev;
2853         ppp_private_area_t *ppp_priv_area = dev->priv;
2854         int err;
2855
2856         struct ifreq if_info;
2857         struct sockaddr_in *if_data1, *if_data2;
2858         mm_segment_t fs;
2859
2860         /* Set Local and remote addresses */
2861         memset(&if_info, 0, sizeof(if_info));
2862         strcpy(if_info.ifr_name, dev->name);
2863
2864
2865         fs = get_fs();
2866         set_fs(get_ds());     /* get user space block */
2867
2868         /* Change the local and remote ip address of the interface.
2869          * This will also add in the destination route.
2870          */
2871         if_data1 = (struct sockaddr_in *)&if_info.ifr_addr;
2872         if_data1->sin_addr.s_addr = ppp_priv_area->ip_local;
2873         if_data1->sin_family = AF_INET;
2874         err = devinet_ioctl( SIOCSIFADDR, &if_info );
2875         if_data2 = (struct sockaddr_in *)&if_info.ifr_dstaddr;
2876         if_data2->sin_addr.s_addr = ppp_priv_area->ip_remote;
2877         if_data2->sin_family = AF_INET;
2878         err = devinet_ioctl( SIOCSIFDSTADDR, &if_info );
2879
2880         set_fs(fs);           /* restore old block */
2881
2882         if (err) {
2883                 printk (KERN_INFO "%s: Adding of route failed: %i\n",
2884                         card->devname,err);
2885                 printk (KERN_INFO "%s:  Local : %u.%u.%u.%u\n",
2886                         card->devname,NIPQUAD(ppp_priv_area->ip_local));
2887                 printk (KERN_INFO "%s:  Remote: %u.%u.%u.%u\n",
2888                         card->devname,NIPQUAD(ppp_priv_area->ip_remote));
2889         }
2890         return err;
2891 }
2892
2893 /*=============================================================================
2894  * Remove Dynamic Route.
2895  * Called when ppp interface disconnected.
2896  */
2897
2898 static void remove_route( sdla_t *card )
2899 {
2900
2901         struct net_device *dev = card->wandev.dev;
2902         long ip_addr;
2903         int err;
2904
2905         mm_segment_t fs;
2906         struct ifreq if_info;
2907         struct sockaddr_in *if_data1;
2908         struct in_device *in_dev = dev->ip_ptr;
2909         struct in_ifaddr *ifa = in_dev->ifa_list;
2910
2911         ip_addr = ifa->ifa_local;
2912
2913         /* Set Local and remote addresses */
2914         memset(&if_info, 0, sizeof(if_info));
2915         strcpy(if_info.ifr_name, dev->name);
2916
2917         fs = get_fs();
2918         set_fs(get_ds());     /* get user space block */
2919
2920         /* Change the local ip address of the interface to 0.
2921          * This will also delete the destination route.
2922          */
2923         if_data1 = (struct sockaddr_in *)&if_info.ifr_addr;
2924         if_data1->sin_addr.s_addr = 0;
2925         if_data1->sin_family = AF_INET;
2926         err = devinet_ioctl( SIOCSIFADDR, &if_info );
2927
2928         set_fs(fs);           /* restore old block */
2929
2930
2931         if (err) {
2932                 printk (KERN_INFO "%s: Deleting dynamic route failed %d!\n",
2933                          card->devname, err);
2934                 return;
2935         }else{
2936                 printk (KERN_INFO "%s: PPP Deleting dynamic route %u.%u.%u.%u successfuly\n",
2937                         card->devname, NIPQUAD(ip_addr));
2938         }
2939         return;
2940 }
2941
2942 /*=============================================================================
2943  * Perform the Interrupt Test by running the READ_CODE_VERSION command MAX_INTR
2944  * _TEST_COUNTER times.
2945  */
2946 static int intr_test( sdla_t *card )
2947 {
2948         ppp_mbox_t *mb = card->mbox;
2949         int err,i;
2950
2951         err = ppp_set_intr_mode( card, 0x08 );
2952
2953         if (err == CMD_OK) {
2954
2955                 for (i = 0; i < MAX_INTR_TEST_COUNTER; i ++) {
2956                         /* Run command READ_CODE_VERSION */
2957                         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
2958                         mb->cmd.length  = 0;
2959                         mb->cmd.command = PPP_READ_CODE_VERSION;
2960                         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
2961                         if (err != CMD_OK)
2962                                 ppp_error(card, err, mb);
2963                 }
2964         }
2965         else return err;
2966
2967         err = ppp_set_intr_mode( card, 0 );
2968         if (err != CMD_OK)
2969                 return err;
2970
2971         return 0;
2972 }
2973
2974 /*==============================================================================
2975  * Determine what type of UDP call it is. DRVSTATS or PTPIPEAB ?
2976  */
2977 static int udp_pkt_type( struct sk_buff *skb, sdla_t *card )
2978 {
2979         unsigned char *sendpacket;
2980         unsigned char buf2[5];
2981         ppp_udp_pkt_t *ppp_udp_pkt = (ppp_udp_pkt_t *)skb->data;
2982
2983         sendpacket = skb->data;
2984         memcpy(&buf2, &card->wandev.udp_port, 2);
2985
2986         if(     ppp_udp_pkt->ip_pkt.ver_inet_hdr_length  == 0x45 &&        /* IP packet */
2987                 sendpacket[9]  == 0x11 &&        /* UDP packet */
2988                 sendpacket[22] == buf2[1] &&     /* UDP Port */
2989                 sendpacket[23] == buf2[0] &&
2990                 sendpacket[36] == 0x01 ) {
2991
2992                 if (    sendpacket[28] == 0x50 &&    /* PTPIPEAB: Signature */
2993                         sendpacket[29] == 0x54 &&
2994                         sendpacket[30] == 0x50 &&
2995                         sendpacket[31] == 0x49 &&
2996                         sendpacket[32] == 0x50 &&
2997                         sendpacket[33] == 0x45 &&
2998                         sendpacket[34] == 0x41 &&
2999                         sendpacket[35] == 0x42 ){
3000
3001                         return UDP_PTPIPE_TYPE;
3002
3003                 } else if(sendpacket[28] == 0x44 &&  /* DRVSTATS: Signature */
3004                         sendpacket[29] == 0x52 &&
3005                         sendpacket[30] == 0x56 &&
3006                         sendpacket[31] == 0x53 &&
3007                         sendpacket[32] == 0x54 &&
3008                         sendpacket[33] == 0x41 &&
3009                         sendpacket[34] == 0x54 &&
3010                         sendpacket[35] == 0x53 ){
3011
3012                         return UDP_DRVSTATS_TYPE;
3013
3014                 } else
3015                         return UDP_INVALID_TYPE;
3016
3017         } else
3018                 return UDP_INVALID_TYPE;
3019
3020 }
3021
3022 /*============================================================================
3023  * Check to see if the packet to be transmitted contains a broadcast or
3024  * multicast source IP address.
3025  */
3026
3027 static int chk_bcast_mcast_addr(sdla_t *card, struct net_device* dev,
3028                                 struct sk_buff *skb)
3029 {
3030         u32 src_ip_addr;
3031         u32 broadcast_ip_addr = 0;
3032         struct in_device *in_dev;
3033
3034         /* read the IP source address from the outgoing packet */
3035         src_ip_addr = *(u32 *)(skb->data + 12);
3036
3037         /* read the IP broadcast address for the device */
3038         in_dev = dev->ip_ptr;
3039         if(in_dev != NULL) {
3040                 struct in_ifaddr *ifa= in_dev->ifa_list;
3041                 if(ifa != NULL)
3042                         broadcast_ip_addr = ifa->ifa_broadcast;
3043                 else
3044                         return 0;
3045         }
3046
3047         /* check if the IP Source Address is a Broadcast address */
3048         if((dev->flags & IFF_BROADCAST) && (src_ip_addr == broadcast_ip_addr)) {
3049                 printk(KERN_INFO "%s: Broadcast Source Address silently discarded\n",
3050                                 card->devname);
3051                 return 1;
3052         }
3053
3054         /* check if the IP Source Address is a Multicast address */
3055         if((ntohl(src_ip_addr) >= 0xE0000001) &&
3056                 (ntohl(src_ip_addr) <= 0xFFFFFFFE)) {
3057                 printk(KERN_INFO "%s: Multicast Source Address silently discarded\n",
3058                                 card->devname);
3059                 return 1;
3060         }
3061
3062         return 0;
3063 }
3064
3065 void s508_lock (sdla_t *card, unsigned long *smp_flags)
3066 {
3067         spin_lock_irqsave(&card->wandev.lock, *smp_flags);
3068 }
3069
3070 void s508_unlock (sdla_t *card, unsigned long *smp_flags)
3071 {
3072         spin_unlock_irqrestore(&card->wandev.lock, *smp_flags);
3073 }
3074
3075 static int read_connection_info (sdla_t *card)
3076 {
3077         ppp_mbox_t *mb = card->mbox;
3078         struct net_device *dev = card->wandev.dev;
3079         ppp_private_area_t *ppp_priv_area = dev->priv;
3080         ppp508_connect_info_t *ppp508_connect_info;
3081         int err;
3082
3083         memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
3084         mb->cmd.length  = 0;
3085         mb->cmd.command = PPP_GET_CONNECTION_INFO;
3086         err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
3087
3088         if (err != CMD_OK) {
3089                 ppp_error(card, err, mb);
3090                 ppp_priv_area->ip_remote = 0;
3091                 ppp_priv_area->ip_local = 0;
3092         }
3093         else {
3094                 ppp508_connect_info = (ppp508_connect_info_t *)mb->data;
3095                 ppp_priv_area->ip_remote = ppp508_connect_info->ip_remote;
3096                 ppp_priv_area->ip_local = ppp508_connect_info->ip_local;
3097
3098                 NEX_PRINTK(KERN_INFO "READ CONNECTION GOT IP ADDRESS %x, %x\n",
3099                                 ppp_priv_area->ip_remote,
3100                                 ppp_priv_area->ip_local);
3101         }
3102
3103         return err;
3104 }
3105
3106 /*===============================================================================
3107  * config_ppp
3108  *
3109  *      Configure the ppp protocol and enable communications.
3110  *
3111  *      The if_open function binds this function to the poll routine.
3112  *      Therefore, this function will run every time the ppp interface
3113  *      is brought up.
3114  *
3115  *      If the communications are not enabled, proceed to configure
3116  *      the card and enable communications.
3117  *
3118  *      If the communications are enabled, it means that the interface
3119  *      was shutdown by ether the user or driver. In this case, we
3120  *      have to check that the IP addresses have not changed.  If
3121  *      the IP addresses changed, we have to reconfigure the firmware
3122  *      and update the changed IP addresses.  Otherwise, just exit.
3123  */
3124 static int config_ppp (sdla_t *card)
3125 {
3126
3127         struct net_device *dev = card->wandev.dev;
3128         ppp_flags_t *flags = card->flags;
3129         ppp_private_area_t *ppp_priv_area = dev->priv;
3130
3131         if (card->u.p.comm_enabled){
3132
3133                 if (ppp_priv_area->ip_local_tmp != ppp_priv_area->ip_local ||
3134                     ppp_priv_area->ip_remote_tmp != ppp_priv_area->ip_remote){
3135
3136                         /* The IP addersses have changed, we must
3137                          * stop the communications and reconfigure
3138                          * the card. Reason: the firmware must know
3139                          * the local and remote IP addresses. */
3140                         disable_comm(card);
3141                         wanpipe_set_state(card, WAN_DISCONNECTED);
3142                         printk(KERN_INFO
3143                                 "%s: IP addresses changed!\n",
3144                                         card->devname);
3145                         printk(KERN_INFO "%s: Restarting communications ...\n",
3146                                         card->devname);
3147                 }else{
3148                         /* IP addresses are the same and the link is up,
3149                          * we don't have to do anything here. Therefore, exit */
3150                         return 0;
3151                 }
3152         }
3153
3154         /* Record the new IP addreses */
3155         ppp_priv_area->ip_local = ppp_priv_area->ip_local_tmp;
3156         ppp_priv_area->ip_remote = ppp_priv_area->ip_remote_tmp;
3157
3158         if (config508(dev, card)){
3159                 printk(KERN_INFO "%s: Failed to configure PPP device\n",
3160                         card->devname);
3161                 return 0;
3162         }
3163
3164         if (ppp_set_intr_mode(card, PPP_INTR_RXRDY|
3165                                         PPP_INTR_TXRDY|
3166                                         PPP_INTR_MODEM|
3167                                         PPP_INTR_DISC |
3168                                         PPP_INTR_OPEN |
3169                                         PPP_INTR_DROP_DTR |
3170                                         PPP_INTR_TIMER)) {
3171
3172                 printk(KERN_INFO "%s: Failed to configure board interrupts !\n",
3173                         card->devname);
3174                 return 0;
3175         }
3176
3177         /* Turn off the transmit and timer interrupt */
3178         flags->imask &= ~(PPP_INTR_TXRDY | PPP_INTR_TIMER) ;
3179
3180
3181         /* If you are not the authenticator and any one of the protocol is
3182          * enabled then we call the set_out_bound_authentication.
3183          */
3184         if ( !card->u.p.authenticator  && (ppp_priv_area->pap || ppp_priv_area->chap)) {
3185                 if ( ppp_set_outbnd_auth(card, ppp_priv_area) ){
3186                         printk(KERN_INFO "%s: Outbound authentication failed !\n",
3187                                 card->devname);
3188                         return 0;
3189                 }
3190         }
3191
3192         /* If you are the authenticator and any one of the protocol is enabled
3193          * then we call the set_in_bound_authentication.
3194          */
3195         if (card->u.p.authenticator && (ppp_priv_area->pap || ppp_priv_area->chap)){
3196                 if (ppp_set_inbnd_auth(card, ppp_priv_area)){
3197                         printk(KERN_INFO "%s: Inbound authentication failed !\n",
3198                                 card->devname);
3199                         return 0;
3200                 }
3201         }
3202
3203         /* If we fail to enable communications here it's OK,
3204          * since the DTR timer will cause a disconnected, which
3205          * will retrigger communication in timer_intr() */
3206         if (ppp_comm_enable(card) == CMD_OK) {
3207                 wanpipe_set_state(card, WAN_CONNECTING);
3208                 init_ppp_tx_rx_buff(card);
3209         }
3210
3211         return 0;
3212 }
3213
3214 /*============================================================
3215  * ppp_poll
3216  *
3217  * Rationale:
3218  *      We cannot manipulate the routing tables, or
3219  *      ip addresses withing the interrupt. Therefore
3220  *      we must perform such actons outside an interrupt
3221  *      at a later time.
3222  *
3223  * Description:
3224  *      PPP polling routine, responsible for
3225  *      shutting down interfaces upon disconnect
3226  *      and adding/removing routes.
3227  *
3228  * Usage:
3229  *      This function is executed for each ppp
3230  *      interface through a tq_schedule bottom half.
3231  *
3232  *      trigger_ppp_poll() function is used to kick
3233  *      the ppp_poll routine.
3234  */
3235 static void ppp_poll(struct net_device *dev)
3236 {
3237         ppp_private_area_t *ppp_priv_area;
3238         sdla_t *card;
3239         u8 check_gateway=0;
3240         ppp_flags_t *flags;
3241
3242         if (!dev || (ppp_priv_area = dev->priv) == NULL)
3243                 return;
3244
3245         card = ppp_priv_area->card;
3246         flags = card->flags;
3247
3248         /* Shutdown is in progress, stop what you are
3249          * doing and get out */
3250         if (test_bit(PERI_CRIT,&card->wandev.critical)){
3251                 clear_bit(POLL_CRIT,&card->wandev.critical);
3252                 return;
3253         }
3254
3255         /* if_open() function has triggered the polling routine
3256          * to determine the configured IP addresses.  Once the
3257          * addresses are found, trigger the chdlc configuration */
3258         if (test_bit(0,&ppp_priv_area->config_ppp)){
3259
3260                 ppp_priv_area->ip_local_tmp  = get_ip_address(dev,WAN_LOCAL_IP);
3261                 ppp_priv_area->ip_remote_tmp = get_ip_address(dev,WAN_POINTOPOINT_IP);
3262
3263                 if (ppp_priv_area->ip_local_tmp == ppp_priv_area->ip_remote_tmp &&
3264                     card->u.p.ip_mode == WANOPT_PPP_HOST){
3265
3266                         if (++ppp_priv_area->ip_error > MAX_IP_ERRORS){
3267                                 printk(KERN_INFO "\n%s: --- WARNING ---\n",
3268                                                 card->devname);
3269                                 printk(KERN_INFO "%s: The local IP address is the same as the\n",
3270                                                 card->devname);
3271                                 printk(KERN_INFO "%s: Point-to-Point IP address.\n",
3272                                                 card->devname);
3273                                 printk(KERN_INFO "%s: --- WARNING ---\n\n",
3274                                                 card->devname);
3275                         }else{
3276                                 clear_bit(POLL_CRIT,&card->wandev.critical);
3277                                 ppp_priv_area->poll_delay_timer.expires = jiffies+HZ;
3278                                 add_timer(&ppp_priv_area->poll_delay_timer);
3279                                 return;
3280                         }
3281                 }
3282
3283                 ppp_priv_area->timer_int_enabled |= TMR_INT_ENABLED_CONFIG;
3284                 flags->imask |= PPP_INTR_TIMER;
3285                 ppp_priv_area->ip_error=0;
3286
3287                 clear_bit(0,&ppp_priv_area->config_ppp);
3288                 clear_bit(POLL_CRIT,&card->wandev.critical);
3289                 return;
3290         }
3291
3292         /* Dynamic interface implementation, as well as dynamic
3293          * routing.  */
3294
3295         switch (card->wandev.state) {
3296
3297         case WAN_DISCONNECTED:
3298
3299                 /* If the dynamic interface configuration is on, and interface
3300                  * is up, then bring down the netowrk interface */
3301
3302                 if (test_bit(DYN_OPT_ON,&ppp_priv_area->interface_down) &&
3303                     !test_bit(DEV_DOWN,&ppp_priv_area->interface_down)  &&
3304                     card->wandev.dev->flags & IFF_UP){
3305
3306                         printk(KERN_INFO "%s: Interface %s down.\n",
3307                                 card->devname,card->wandev.dev->name);
3308                         change_dev_flags(card->wandev.dev,
3309                                         (card->wandev.dev->flags&~IFF_UP));
3310                         set_bit(DEV_DOWN,&ppp_priv_area->interface_down);
3311                 }else{
3312                         /* We need to check if the local IP address is
3313                          * zero. If it is, we shouldn't try to remove it.
3314                          * For some reason the kernel crashes badly if
3315                          * we try to remove the route twice */
3316
3317                         if (card->wandev.dev->flags & IFF_UP &&
3318                             get_ip_address(card->wandev.dev,WAN_LOCAL_IP) &&
3319                             card->u.p.ip_mode == WANOPT_PPP_PEER){
3320
3321                                 remove_route(card);
3322                         }
3323                 }
3324                 break;
3325
3326         case WAN_CONNECTED:
3327
3328                 /* In SMP machine this code can execute before the interface
3329                  * comes up.  In this case, we must make sure that we do not
3330                  * try to bring up the interface before dev_open() is finished */
3331
3332
3333                 /* DEV_DOWN will be set only when we bring down the interface
3334                  * for the very first time. This way we know that it was us
3335                  * that brought the interface down */
3336
3337                 if (test_bit(DYN_OPT_ON,&ppp_priv_area->interface_down) &&
3338                     test_bit(DEV_DOWN,  &ppp_priv_area->interface_down) &&
3339                     !(card->wandev.dev->flags & IFF_UP)){
3340
3341                         printk(KERN_INFO "%s: Interface %s up.\n",
3342                                 card->devname,card->wandev.dev->name);
3343
3344                         change_dev_flags(card->wandev.dev,(card->wandev.dev->flags|IFF_UP));
3345                         clear_bit(DEV_DOWN,&ppp_priv_area->interface_down);
3346                         check_gateway=1;
3347                 }
3348
3349                 if ((card->u.p.ip_mode == WANOPT_PPP_PEER) &&
3350                     test_bit(1,&Read_connection_info)) {
3351
3352                         process_route(card);
3353                         clear_bit(1,&Read_connection_info);
3354                         check_gateway=1;
3355                 }
3356
3357                 if (ppp_priv_area->gateway && check_gateway)
3358                         add_gateway(card,dev);
3359
3360                 break;
3361         }
3362         clear_bit(POLL_CRIT,&card->wandev.critical);
3363         return;
3364 }
3365
3366 /*============================================================
3367  * trigger_ppp_poll
3368  *
3369  * Description:
3370  *      Add a ppp_poll() task into a tq_scheduler bh handler
3371  *      for a specific interface.  This will kick
3372  *      the ppp_poll() routine at a later time.
3373  *
3374  * Usage:
3375  *      Interrupts use this to defer a taks to
3376  *      a polling routine.
3377  *
3378  */
3379
3380 static void trigger_ppp_poll(struct net_device *dev)
3381 {
3382         ppp_private_area_t *ppp_priv_area;
3383         if ((ppp_priv_area=dev->priv) != NULL){
3384
3385                 sdla_t *card = ppp_priv_area->card;
3386
3387                 if (test_bit(PERI_CRIT,&card->wandev.critical)){
3388                         return;
3389                 }
3390
3391                 if (test_and_set_bit(POLL_CRIT,&card->wandev.critical)){
3392                         return;
3393                 }
3394
3395                 schedule_work(&ppp_priv_area->poll_work);
3396         }
3397         return;
3398 }
3399
3400 static void ppp_poll_delay (unsigned long dev_ptr)
3401 {
3402         struct net_device *dev = (struct net_device *)dev_ptr;
3403         trigger_ppp_poll(dev);
3404 }
3405
3406 /*============================================================
3407  * detect_and_fix_tx_bug
3408  *
3409  * Description:
3410  *      On connect, if the board tx buffer ptr is not the same
3411  *      as the driver tx buffer ptr, we found a firmware bug.
3412  *      Report the bug to the above layer.  To fix the
3413  *      error restart communications again.
3414  *
3415  * Usage:
3416  *
3417  */
3418
3419 static int detect_and_fix_tx_bug (sdla_t *card)
3420 {
3421         if (((unsigned long)card->u.p.txbuf_base&0xFFF) != ((*card->u.p.txbuf_next)&0xFFF)){
3422                 NEX_PRINTK(KERN_INFO "Major Error, Fix the bug\n");
3423                 return 1;
3424         }
3425         return 0;
3426 }
3427
3428 MODULE_LICENSE("GPL");
3429
3430 /****** End *****************************************************************/