net/decnet/dn_dev.c

   1 /*
   2  * DECnet       An implementation of the DECnet protocol suite for the LINUX
   3  *              operating system.  DECnet is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              DECnet Device Layer
   7  *
   8  * Authors:     Steve Whitehouse <SteveW@ACM.org>
   9  *              Eduardo Marcelo Serrat <emserrat@geocities.com>
  10  *
  11  * Changes:
  12  *          Steve Whitehouse : Devices now see incoming frames so they
  13  *                             can mark on who it came from.
  14  *          Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour
  15  *                             can now have a device specific setup func.
  16  *          Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/
  17  *          Steve Whitehouse : Fixed bug which sometimes killed timer
  18  *          Steve Whitehouse : Multiple ifaddr support
  19  *          Steve Whitehouse : SIOCGIFCONF is now a compile time option
  20  *          Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding
  21  *          Steve Whitehouse : Removed timer1 - it's a user space issue now
  22  *         Patrick Caulfield : Fixed router hello message format
  23  *          Steve Whitehouse : Got rid of constant sizes for blksize for
  24  *                             devices. All mtu based now.
  25  */
  26
  27 #include <linux/config.h>
  28 #include <linux/module.h>
  29 #include <linux/moduleparam.h>
  30 #include <linux/init.h>
  31 #include <linux/net.h>
  32 #include <linux/netdevice.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/timer.h>
  36 #include <linux/string.h>
  37 #include <linux/if_arp.h>
  38 #include <linux/if_ether.h>
  39 #include <linux/skbuff.h>
  40 #include <linux/rtnetlink.h>
  41 #include <linux/sysctl.h>
  42 #include <linux/notifier.h>
  43 #include <asm/uaccess.h>
  44 #include <asm/system.h>
  45 #include <net/neighbour.h>
  46 #include <net/dst.h>
  47 #include <net/flow.h>
  48 #include <net/dn.h>
  49 #include <net/dn_dev.h>
  50 #include <net/dn_route.h>
  51 #include <net/dn_neigh.h>
  52 #include <net/dn_fib.h>
  53
  54 #define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
  55
  56 static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
  57 static char dn_rt_all_rt_mcast[ETH_ALEN]  = {0xAB,0x00,0x00,0x03,0x00,0x00};
  58 static char dn_hiord[ETH_ALEN]            = {0xAA,0x00,0x04,0x00,0x00,0x00};
  59 static unsigned char dn_eco_version[3]    = {0x02,0x00,0x00};
  60
  61 extern struct neigh_table dn_neigh_table;
  62
  63 /*
  64  * decnet_address is kept in network order.
  65  */
  66 dn_address decnet_address = 0;
  67
  68 static DEFINE_RWLOCK(dndev_lock);
  69 static struct net_device *decnet_default_device;
  70 static struct notifier_block *dnaddr_chain;
  71
  72 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
  73 static void dn_dev_delete(struct net_device *dev);
  74 static void rtmsg_ifa(int event, struct dn_ifaddr *ifa);
  75
  76 static int dn_eth_up(struct net_device *);
  77 static void dn_eth_down(struct net_device *);
  78 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  79 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  80
  81 static struct dn_dev_parms dn_dev_list[] =  {
  82 {
  83         .type =         ARPHRD_ETHER, /* Ethernet */
  84         .mode =         DN_DEV_BCAST,
  85         .state =        DN_DEV_S_RU,
  86         .t2 =           1,
  87         .t3 =           10,
  88         .name =         "ethernet",
  89         .ctl_name =     NET_DECNET_CONF_ETHER,
  90         .up =           dn_eth_up,
  91         .down =         dn_eth_down,
  92         .timer3 =       dn_send_brd_hello,
  93 },
  94 {
  95         .type =         ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
  96         .mode =         DN_DEV_BCAST,
  97         .state =        DN_DEV_S_RU,
  98         .t2 =           1,
  99         .t3 =           10,
 100         .name =         "ipgre",
 101         .ctl_name =     NET_DECNET_CONF_GRE,
 102         .timer3 =       dn_send_brd_hello,
 103 },
 104 #if 0
 105 {
 106         .type =         ARPHRD_X25, /* Bog standard X.25 */
 107         .mode =         DN_DEV_UCAST,
 108         .state =        DN_DEV_S_DS,
 109         .t2 =           1,
 110         .t3 =           120,
 111         .name =         "x25",
 112         .ctl_name =     NET_DECNET_CONF_X25,
 113         .timer3 =       dn_send_ptp_hello,
 114 },
 115 #endif
 116 #if 0
 117 {
 118         .type =         ARPHRD_PPP, /* DECnet over PPP */
 119         .mode =         DN_DEV_BCAST,
 120         .state =        DN_DEV_S_RU,
 121         .t2 =           1,
 122         .t3 =           10,
 123         .name =         "ppp",
 124         .ctl_name =     NET_DECNET_CONF_PPP,
 125         .timer3 =       dn_send_brd_hello,
 126 },
 127 #endif
 128 {
 129         .type =         ARPHRD_DDCMP, /* DECnet over DDCMP */
 130         .mode =         DN_DEV_UCAST,
 131         .state =        DN_DEV_S_DS,
 132         .t2 =           1,
 133         .t3 =           120,
 134         .name =         "ddcmp",
 135         .ctl_name =     NET_DECNET_CONF_DDCMP,
 136         .timer3 =       dn_send_ptp_hello,
 137 },
 138 {
 139         .type =         ARPHRD_LOOPBACK, /* Loopback interface - always last */
 140         .mode =         DN_DEV_BCAST,
 141         .state =        DN_DEV_S_RU,
 142         .t2 =           1,
 143         .t3 =           10,
 144         .name =         "loopback",
 145         .ctl_name =     NET_DECNET_CONF_LOOPBACK,
 146         .timer3 =       dn_send_brd_hello,
 147 }
 148 };
 149
 150 #define DN_DEV_LIST_SIZE (sizeof(dn_dev_list)/sizeof(struct dn_dev_parms))
 151
 152 #define DN_DEV_PARMS_OFFSET(x) ((int) ((char *) &((struct dn_dev_parms *)0)->x))
 153
 154 #ifdef CONFIG_SYSCTL
 155
 156 static int min_t2[] = { 1 };
 157 static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
 158 static int min_t3[] = { 1 };
 159 static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
 160
 161 static int min_priority[1];
 162 static int max_priority[] = { 127 }; /* From DECnet spec */
 163
 164 static int dn_forwarding_proc(ctl_table *, int, struct file *,
 165                         void __user *, size_t *, loff_t *);
 166 static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
 167                         void __user *oldval, size_t __user *oldlenp,
 168                         void __user *newval, size_t newlen,
 169                         void **context);
 170
 171 static struct dn_dev_sysctl_table {
 172         struct ctl_table_header *sysctl_header;
 173         ctl_table dn_dev_vars[5];
 174         ctl_table dn_dev_dev[2];
 175         ctl_table dn_dev_conf_dir[2];
 176         ctl_table dn_dev_proto_dir[2];
 177         ctl_table dn_dev_root_dir[2];
 178 } dn_dev_sysctl = {
 179         NULL,
 180         {
 181         {
 182                 .ctl_name = NET_DECNET_CONF_DEV_FORWARDING,
 183                 .procname = "forwarding",
 184                 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
 185                 .maxlen = sizeof(int),
 186                 .mode = 0644,
 187                 .proc_handler = dn_forwarding_proc,
 188                 .strategy = dn_forwarding_sysctl,
 189         },
 190         {
 191                 .ctl_name = NET_DECNET_CONF_DEV_PRIORITY,
 192                 .procname = "priority",
 193                 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
 194                 .maxlen = sizeof(int),
 195                 .mode = 0644,
 196                 .proc_handler = proc_dointvec_minmax,
 197                 .strategy = sysctl_intvec,
 198                 .extra1 = &min_priority,
 199                 .extra2 = &max_priority
 200         },
 201         {
 202                 .ctl_name = NET_DECNET_CONF_DEV_T2,
 203                 .procname = "t2",
 204                 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
 205                 .maxlen = sizeof(int),
 206                 .mode = 0644,
 207                 .proc_handler = proc_dointvec_minmax,
 208                 .strategy = sysctl_intvec,
 209                 .extra1 = &min_t2,
 210                 .extra2 = &max_t2
 211         },
 212         {
 213                 .ctl_name = NET_DECNET_CONF_DEV_T3,
 214                 .procname = "t3",
 215                 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
 216                 .maxlen = sizeof(int),
 217                 .mode = 0644,
 218                 .proc_handler = proc_dointvec_minmax,
 219                 .strategy = sysctl_intvec,
 220                 .extra1 = &min_t3,
 221                 .extra2 = &max_t3
 222         },
 223         {0}
 224         },
 225         {{
 226                 .ctl_name = 0,
 227                 .procname = "",
 228                 .mode = 0555,
 229                 .child = dn_dev_sysctl.dn_dev_vars
 230         }, {0}},
 231         {{
 232                 .ctl_name = NET_DECNET_CONF,
 233                 .procname = "conf",
 234                 .mode = 0555,
 235                 .child = dn_dev_sysctl.dn_dev_dev
 236         }, {0}},
 237         {{
 238                 .ctl_name = NET_DECNET,
 239                 .procname = "decnet",
 240                 .mode = 0555,
 241                 .child = dn_dev_sysctl.dn_dev_conf_dir
 242         }, {0}},
 243         {{
 244                 .ctl_name = CTL_NET,
 245                 .procname = "net",
 246                 .mode = 0555,
 247                 .child = dn_dev_sysctl.dn_dev_proto_dir
 248         }, {0}}
 249 };
 250
 251 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 252 {
 253         struct dn_dev_sysctl_table *t;
 254         int i;
 255
 256         t = kmalloc(sizeof(*t), GFP_KERNEL);
 257         if (t == NULL)
 258                 return;
 259
 260         memcpy(t, &dn_dev_sysctl, sizeof(*t));
 261
 262         for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
 263                 long offset = (long)t->dn_dev_vars[i].data;
 264                 t->dn_dev_vars[i].data = ((char *)parms) + offset;
 265                 t->dn_dev_vars[i].de = NULL;
 266         }
 267
 268         if (dev) {
 269                 t->dn_dev_dev[0].procname = dev->name;
 270                 t->dn_dev_dev[0].ctl_name = dev->ifindex;
 271         } else {
 272                 t->dn_dev_dev[0].procname = parms->name;
 273                 t->dn_dev_dev[0].ctl_name = parms->ctl_name;
 274         }
 275
 276         t->dn_dev_dev[0].child = t->dn_dev_vars;
 277         t->dn_dev_dev[0].de = NULL;
 278         t->dn_dev_conf_dir[0].child = t->dn_dev_dev;
 279         t->dn_dev_conf_dir[0].de = NULL;
 280         t->dn_dev_proto_dir[0].child = t->dn_dev_conf_dir;
 281         t->dn_dev_proto_dir[0].de = NULL;
 282         t->dn_dev_root_dir[0].child = t->dn_dev_proto_dir;
 283         t->dn_dev_root_dir[0].de = NULL;
 284         t->dn_dev_vars[0].extra1 = (void *)dev;
 285
 286         t->sysctl_header = register_sysctl_table(t->dn_dev_root_dir, 0);
 287         if (t->sysctl_header == NULL)
 288                 kfree(t);
 289         else
 290                 parms->sysctl = t;
 291 }
 292
 293 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 294 {
 295         if (parms->sysctl) {
 296                 struct dn_dev_sysctl_table *t = parms->sysctl;
 297                 parms->sysctl = NULL;
 298                 unregister_sysctl_table(t->sysctl_header);
 299                 kfree(t);
 300         }
 301 }
 302
 303 static int dn_forwarding_proc(ctl_table *table, int write,
 304                                 struct file *filep,
 305                                 void __user *buffer,
 306                                 size_t *lenp, loff_t *ppos)
 307 {
 308 #ifdef CONFIG_DECNET_ROUTER
 309         struct net_device *dev = table->extra1;
 310         struct dn_dev *dn_db;
 311         int err;
 312         int tmp, old;
 313
 314         if (table->extra1 == NULL)
 315                 return -EINVAL;
 316
 317         dn_db = dev->dn_ptr;
 318         old = dn_db->parms.forwarding;
 319
 320         err = proc_dointvec(table, write, filep, buffer, lenp, ppos);
 321
 322         if ((err >= 0) && write) {
 323                 if (dn_db->parms.forwarding < 0)
 324                         dn_db->parms.forwarding = 0;
 325                 if (dn_db->parms.forwarding > 2)
 326                         dn_db->parms.forwarding = 2;
 327                 /*
 328                  * What an ugly hack this is... its works, just. It
 329                  * would be nice if sysctl/proc were just that little
 330                  * bit more flexible so I don't have to write a special
 331                  * routine, or suffer hacks like this - SJW
 332                  */
 333                 tmp = dn_db->parms.forwarding;
 334                 dn_db->parms.forwarding = old;
 335                 if (dn_db->parms.down)
 336                         dn_db->parms.down(dev);
 337                 dn_db->parms.forwarding = tmp;
 338                 if (dn_db->parms.up)
 339                         dn_db->parms.up(dev);
 340         }
 341
 342         return err;
 343 #else
 344         return -EINVAL;
 345 #endif
 346 }
 347
 348 static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
 349                         void __user *oldval, size_t __user *oldlenp,
 350                         void __user *newval, size_t newlen,
 351                         void **context)
 352 {
 353 #ifdef CONFIG_DECNET_ROUTER
 354         struct net_device *dev = table->extra1;
 355         struct dn_dev *dn_db;
 356         int value;
 357
 358         if (table->extra1 == NULL)
 359                 return -EINVAL;
 360
 361         dn_db = dev->dn_ptr;
 362
 363         if (newval && newlen) {
 364                 if (newlen != sizeof(int))
 365                         return -EINVAL;
 366
 367                 if (get_user(value, (int __user *)newval))
 368                         return -EFAULT;
 369                 if (value < 0)
 370                         return -EINVAL;
 371                 if (value > 2)
 372                         return -EINVAL;
 373
 374                 if (dn_db->parms.down)
 375                         dn_db->parms.down(dev);
 376                 dn_db->parms.forwarding = value;
 377                 if (dn_db->parms.up)
 378                         dn_db->parms.up(dev);
 379         }
 380
 381         return 0;
 382 #else
 383         return -EINVAL;
 384 #endif
 385 }
 386
 387 #else /* CONFIG_SYSCTL */
 388 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 389 {
 390 }
 391 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 392 {
 393 }
 394
 395 #endif /* CONFIG_SYSCTL */
 396
 397 static inline __u16 mtu2blksize(struct net_device *dev)
 398 {
 399         u32 blksize = dev->mtu;
 400         if (blksize > 0xffff)
 401                 blksize = 0xffff;
 402
 403         if (dev->type == ARPHRD_ETHER ||
 404             dev->type == ARPHRD_PPP ||
 405             dev->type == ARPHRD_IPGRE ||
 406             dev->type == ARPHRD_LOOPBACK)
 407                 blksize -= 2;
 408
 409         return (__u16)blksize;
 410 }
 411
 412 static struct dn_ifaddr *dn_dev_alloc_ifa(void)
 413 {
 414         struct dn_ifaddr *ifa;
 415
 416         ifa = kmalloc(sizeof(*ifa), GFP_KERNEL);
 417
 418         if (ifa) {
 419                 memset(ifa, 0, sizeof(*ifa));
 420         }
 421
 422         return ifa;
 423 }
 424
 425 static __inline__ void dn_dev_free_ifa(struct dn_ifaddr *ifa)
 426 {
 427         kfree(ifa);
 428 }
 429
 430 static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr **ifap, int destroy)
 431 {
 432         struct dn_ifaddr *ifa1 = *ifap;
 433         unsigned char mac_addr[6];
 434         struct net_device *dev = dn_db->dev;
 435
 436         ASSERT_RTNL();
 437
 438         *ifap = ifa1->ifa_next;
 439
 440         if (dn_db->dev->type == ARPHRD_ETHER) {
 441                 if (ifa1->ifa_local != dn_htons(dn_eth2dn(dev->dev_addr))) {
 442                         dn_dn2eth(mac_addr, ifa1->ifa_local);
 443                         dev_mc_delete(dev, mac_addr, ETH_ALEN, 0);
 444                 }
 445         }
 446
 447         rtmsg_ifa(RTM_DELADDR, ifa1);
 448         notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
 449         if (destroy) {
 450                 dn_dev_free_ifa(ifa1);
 451
 452                 if (dn_db->ifa_list == NULL)
 453                         dn_dev_delete(dn_db->dev);
 454         }
 455 }
 456
 457 static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 458 {
 459         struct net_device *dev = dn_db->dev;
 460         struct dn_ifaddr *ifa1;
 461         unsigned char mac_addr[6];
 462
 463         ASSERT_RTNL();
 464
 465         /* Check for duplicates */
 466         for(ifa1 = dn_db->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
 467                 if (ifa1->ifa_local == ifa->ifa_local)
 468                         return -EEXIST;
 469         }
 470
 471         if (dev->type == ARPHRD_ETHER) {
 472                 if (ifa->ifa_local != dn_htons(dn_eth2dn(dev->dev_addr))) {
 473                         dn_dn2eth(mac_addr, ifa->ifa_local);
 474                         dev_mc_add(dev, mac_addr, ETH_ALEN, 0);
 475                         dev_mc_upload(dev);
 476                 }
 477         }
 478
 479         ifa->ifa_next = dn_db->ifa_list;
 480         dn_db->ifa_list = ifa;
 481
 482         rtmsg_ifa(RTM_NEWADDR, ifa);
 483         notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
 484
 485         return 0;
 486 }
 487
 488 static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
 489 {
 490         struct dn_dev *dn_db = dev->dn_ptr;
 491         int rv;
 492
 493         if (dn_db == NULL) {
 494                 int err;
 495                 dn_db = dn_dev_create(dev, &err);
 496                 if (dn_db == NULL)
 497                         return err;
 498         }
 499
 500         ifa->ifa_dev = dn_db;
 501
 502         if (dev->flags & IFF_LOOPBACK)
 503                 ifa->ifa_scope = RT_SCOPE_HOST;
 504
 505         rv = dn_dev_insert_ifa(dn_db, ifa);
 506         if (rv)
 507                 dn_dev_free_ifa(ifa);
 508         return rv;
 509 }
 510
 511
 512 int dn_dev_ioctl(unsigned int cmd, void __user *arg)
 513 {
 514         char buffer[DN_IFREQ_SIZE];
 515         struct ifreq *ifr = (struct ifreq *)buffer;
 516         struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
 517         struct dn_dev *dn_db;
 518         struct net_device *dev;
 519         struct dn_ifaddr *ifa = NULL, **ifap = NULL;
 520         int ret = 0;
 521
 522         if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
 523                 return -EFAULT;
 524         ifr->ifr_name[IFNAMSIZ-1] = 0;
 525
 526 #ifdef CONFIG_KMOD
 527         dev_load(ifr->ifr_name);
 528 #endif
 529
 530         switch(cmd) {
 531                 case SIOCGIFADDR:
 532                         break;
 533                 case SIOCSIFADDR:
 534                         if (!capable(CAP_NET_ADMIN))
 535                                 return -EACCES;
 536                         if (sdn->sdn_family != AF_DECnet)
 537                                 return -EINVAL;
 538                         break;
 539                 default:
 540                         return -EINVAL;
 541         }
 542
 543         rtnl_lock();
 544
 545         if ((dev = __dev_get_by_name(ifr->ifr_name)) == NULL) {
 546                 ret = -ENODEV;
 547                 goto done;
 548         }
 549
 550         if ((dn_db = dev->dn_ptr) != NULL) {
 551                 for (ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next)
 552                         if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
 553                                 break;
 554         }
 555
 556         if (ifa == NULL && cmd != SIOCSIFADDR) {
 557                 ret = -EADDRNOTAVAIL;
 558                 goto done;
 559         }
 560
 561         switch(cmd) {
 562                 case SIOCGIFADDR:
 563                         *((dn_address *)sdn->sdn_nodeaddr) = ifa->ifa_local;
 564                         goto rarok;
 565
 566                 case SIOCSIFADDR:
 567                         if (!ifa) {
 568                                 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
 569                                         ret = -ENOBUFS;
 570                                         break;
 571                                 }
 572                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 573                         } else {
 574                                 if (ifa->ifa_local == dn_saddr2dn(sdn))
 575                                         break;
 576                                 dn_dev_del_ifa(dn_db, ifap, 0);
 577                         }
 578
 579                         ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
 580
 581                         ret = dn_dev_set_ifa(dev, ifa);
 582         }
 583 done:
 584         rtnl_unlock();
 585
 586         return ret;
 587 rarok:
 588         if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
 589                 ret = -EFAULT;
 590         goto done;
 591 }
 592
 593 struct net_device *dn_dev_get_default(void)
 594 {
 595         struct net_device *dev;
 596         read_lock(&dndev_lock);
 597         dev = decnet_default_device;
 598         if (dev) {
 599                 if (dev->dn_ptr)
 600                         dev_hold(dev);
 601                 else
 602                         dev = NULL;
 603         }
 604         read_unlock(&dndev_lock);
 605         return dev;
 606 }
 607
 608 int dn_dev_set_default(struct net_device *dev, int force)
 609 {
 610         struct net_device *old = NULL;
 611         int rv = -EBUSY;
 612         if (!dev->dn_ptr)
 613                 return -ENODEV;
 614         write_lock(&dndev_lock);
 615         if (force || decnet_default_device == NULL) {
 616                 old = decnet_default_device;
 617                 decnet_default_device = dev;
 618                 rv = 0;
 619         }
 620         write_unlock(&dndev_lock);
 621         if (old)
 622                 dev_put(dev);
 623         return rv;
 624 }
 625
 626 static void dn_dev_check_default(struct net_device *dev)
 627 {
 628         write_lock(&dndev_lock);
 629         if (dev == decnet_default_device) {
 630                 decnet_default_device = NULL;
 631         } else {
 632                 dev = NULL;
 633         }
 634         write_unlock(&dndev_lock);
 635         if (dev)
 636                 dev_put(dev);
 637 }
 638
 639 static struct dn_dev *dn_dev_by_index(int ifindex)
 640 {
 641         struct net_device *dev;
 642         struct dn_dev *dn_dev = NULL;
 643         dev = dev_get_by_index(ifindex);
 644         if (dev) {
 645                 dn_dev = dev->dn_ptr;
 646                 dev_put(dev);
 647         }
 648
 649         return dn_dev;
 650 }
 651
 652 static int dn_dev_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 653 {
 654         struct rtattr **rta = arg;
 655         struct dn_dev *dn_db;
 656         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
 657         struct dn_ifaddr *ifa, **ifap;
 658
 659         if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
 660                 return -EADDRNOTAVAIL;
 661
 662         for(ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next) {
 663                 void *tmp = rta[IFA_LOCAL-1];
 664                 if ((tmp && memcmp(RTA_DATA(tmp), &ifa->ifa_local, 2)) ||
 665                     (rta[IFA_LABEL-1] && rtattr_strcmp(rta[IFA_LABEL-1], ifa->ifa_label)))
 666                         continue;
 667
 668                 dn_dev_del_ifa(dn_db, ifap, 1);
 669                 return 0;
 670         }
 671
 672         return -EADDRNOTAVAIL;
 673 }
 674
 675 static int dn_dev_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 676 {
 677         struct rtattr **rta = arg;
 678         struct net_device *dev;
 679         struct dn_dev *dn_db;
 680         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
 681         struct dn_ifaddr *ifa;
 682         int rv;
 683
 684         if (rta[IFA_LOCAL-1] == NULL)
 685                 return -EINVAL;
 686
 687         if ((dev = __dev_get_by_index(ifm->ifa_index)) == NULL)
 688                 return -ENODEV;
 689
 690         if ((dn_db = dev->dn_ptr) == NULL) {
 691                 int err;
 692                 dn_db = dn_dev_create(dev, &err);
 693                 if (!dn_db)
 694                         return err;
 695         }
 696
 697         if ((ifa = dn_dev_alloc_ifa()) == NULL)
 698                 return -ENOBUFS;
 699
 700         if (!rta[IFA_ADDRESS - 1])
 701                 rta[IFA_ADDRESS - 1] = rta[IFA_LOCAL - 1];
 702         memcpy(&ifa->ifa_local, RTA_DATA(rta[IFA_LOCAL-1]), 2);
 703         memcpy(&ifa->ifa_address, RTA_DATA(rta[IFA_ADDRESS-1]), 2);
 704         ifa->ifa_flags = ifm->ifa_flags;
 705         ifa->ifa_scope = ifm->ifa_scope;
 706         ifa->ifa_dev = dn_db;
 707         if (rta[IFA_LABEL-1])
 708                 rtattr_strlcpy(ifa->ifa_label, rta[IFA_LABEL-1], IFNAMSIZ);
 709         else
 710                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 711
 712         rv = dn_dev_insert_ifa(dn_db, ifa);
 713         if (rv)
 714                 dn_dev_free_ifa(ifa);
 715         return rv;
 716 }
 717
 718 static int dn_dev_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
 719                                 u32 pid, u32 seq, int event, unsigned int flags)
 720 {
 721         struct ifaddrmsg *ifm;
 722         struct nlmsghdr *nlh;
 723         unsigned char *b = skb->tail;
 724
 725         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
 726         ifm = NLMSG_DATA(nlh);
 727
 728         ifm->ifa_family = AF_DECnet;
 729         ifm->ifa_prefixlen = 16;
 730         ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
 731         ifm->ifa_scope = ifa->ifa_scope;
 732         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
 733         if (ifa->ifa_address)
 734                 RTA_PUT(skb, IFA_ADDRESS, 2, &ifa->ifa_address);
 735         if (ifa->ifa_local)
 736                 RTA_PUT(skb, IFA_LOCAL, 2, &ifa->ifa_local);
 737         if (ifa->ifa_label[0])
 738                 RTA_PUT(skb, IFA_LABEL, IFNAMSIZ, &ifa->ifa_label);
 739         nlh->nlmsg_len = skb->tail - b;
 740         return skb->len;
 741
 742 nlmsg_failure:
 743 rtattr_failure:
 744         skb_trim(skb, b - skb->data);
 745         return -1;
 746 }
 747
 748 static void rtmsg_ifa(int event, struct dn_ifaddr *ifa)
 749 {
 750         struct sk_buff *skb;
 751         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
 752
 753         skb = alloc_skb(size, GFP_KERNEL);
 754         if (!skb) {
 755                 netlink_set_err(rtnl, 0, RTNLGRP_DECnet_IFADDR, ENOBUFS);
 756                 return;
 757         }
 758         if (dn_dev_fill_ifaddr(skb, ifa, 0, 0, event, 0) < 0) {
 759                 kfree_skb(skb);
 760                 netlink_set_err(rtnl, 0, RTNLGRP_DECnet_IFADDR, EINVAL);
 761                 return;
 762         }
 763         NETLINK_CB(skb).dst_group = RTNLGRP_DECnet_IFADDR;
 764         netlink_broadcast(rtnl, skb, 0, RTNLGRP_DECnet_IFADDR, GFP_KERNEL);
 765 }
 766
 767 static int dn_dev_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
 768 {
 769         int idx, dn_idx;
 770         int s_idx, s_dn_idx;
 771         struct net_device *dev;
 772         struct dn_dev *dn_db;
 773         struct dn_ifaddr *ifa;
 774
 775         s_idx = cb->args[0];
 776         s_dn_idx = dn_idx = cb->args[1];
 777         read_lock(&dev_base_lock);
 778         for(dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
 779                 if (idx < s_idx)
 780                         continue;
 781                 if (idx > s_idx)
 782                         s_dn_idx = 0;
 783                 if ((dn_db = dev->dn_ptr) == NULL)
 784                         continue;
 785
 786                 for(ifa = dn_db->ifa_list, dn_idx = 0; ifa; ifa = ifa->ifa_next, dn_idx++) {
 787                         if (dn_idx < s_dn_idx)
 788                                 continue;
 789
 790                         if (dn_dev_fill_ifaddr(skb, ifa,
 791                                                NETLINK_CB(cb->skb).pid,
 792                                                cb->nlh->nlmsg_seq,
 793                                                RTM_NEWADDR,
 794                                                NLM_F_MULTI) <= 0)
 795                                 goto done;
 796                 }
 797         }
 798 done:
 799         read_unlock(&dev_base_lock);
 800         cb->args[0] = idx;
 801         cb->args[1] = dn_idx;
 802
 803         return skb->len;
 804 }
 805
 806 static int dn_dev_get_first(struct net_device *dev, dn_address *addr)
 807 {
 808         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 809         struct dn_ifaddr *ifa;
 810         int rv = -ENODEV;
 811         if (dn_db == NULL)
 812                 goto out;
 813         ifa = dn_db->ifa_list;
 814         if (ifa != NULL) {
 815                 *addr = ifa->ifa_local;
 816                 rv = 0;
 817         }
 818 out:
 819         return rv;
 820 }
 821
 822 /*
 823  * Find a default address to bind to.
 824  *
 825  * This is one of those areas where the initial VMS concepts don't really
 826  * map onto the Linux concepts, and since we introduced multiple addresses
 827  * per interface we have to cope with slightly odd ways of finding out what
 828  * "our address" really is. Mostly it's not a problem; for this we just guess
 829  * a sensible default. Eventually the routing code will take care of all the
 830  * nasties for us I hope.
 831  */
 832 int dn_dev_bind_default(dn_address *addr)
 833 {
 834         struct net_device *dev;
 835         int rv;
 836         dev = dn_dev_get_default();
 837 last_chance:
 838         if (dev) {
 839                 read_lock(&dev_base_lock);
 840                 rv = dn_dev_get_first(dev, addr);
 841                 read_unlock(&dev_base_lock);
 842                 dev_put(dev);
 843                 if (rv == 0 || dev == &loopback_dev)
 844                         return rv;
 845         }
 846         dev = &loopback_dev;
 847         dev_hold(dev);
 848         goto last_chance;
 849 }
 850
 851 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 852 {
 853         struct endnode_hello_message *msg;
 854         struct sk_buff *skb = NULL;
 855         unsigned short int *pktlen;
 856         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 857
 858         if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
 859                 return;
 860
 861         skb->dev = dev;
 862
 863         msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
 864
 865         msg->msgflg  = 0x0D;
 866         memcpy(msg->tiver, dn_eco_version, 3);
 867         dn_dn2eth(msg->id, ifa->ifa_local);
 868         msg->iinfo   = DN_RT_INFO_ENDN;
 869         msg->blksize = dn_htons(mtu2blksize(dev));
 870         msg->area    = 0x00;
 871         memset(msg->seed, 0, 8);
 872         memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
 873
 874         if (dn_db->router) {
 875                 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 876                 dn_dn2eth(msg->neighbor, dn->addr);
 877         }
 878
 879         msg->timer   = dn_htons((unsigned short)dn_db->parms.t3);
 880         msg->mpd     = 0x00;
 881         msg->datalen = 0x02;
 882         memset(msg->data, 0xAA, 2);
 883
 884         pktlen = (unsigned short *)skb_push(skb,2);
 885         *pktlen = dn_htons(skb->len - 2);
 886
 887         skb->nh.raw = skb->data;
 888
 889         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
 890 }
 891
 892
 893 #define DRDELAY (5 * HZ)
 894
 895 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 896 {
 897         /* First check time since device went up */
 898         if ((jiffies - dn_db->uptime) < DRDELAY)
 899                 return 0;
 900
 901         /* If there is no router, then yes... */
 902         if (!dn_db->router)
 903                 return 1;
 904
 905         /* otherwise only if we have a higher priority or.. */
 906         if (dn->priority < dn_db->parms.priority)
 907                 return 1;
 908
 909         /* if we have equal priority and a higher node number */
 910         if (dn->priority != dn_db->parms.priority)
 911                 return 0;
 912
 913         if (dn_ntohs(dn->addr) < dn_ntohs(ifa->ifa_local))
 914                 return 1;
 915
 916         return 0;
 917 }
 918
 919 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 920 {
 921         int n;
 922         struct dn_dev *dn_db = dev->dn_ptr;
 923         struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 924         struct sk_buff *skb;
 925         size_t size;
 926         unsigned char *ptr;
 927         unsigned char *i1, *i2;
 928         unsigned short *pktlen;
 929         char *src;
 930
 931         if (mtu2blksize(dev) < (26 + 7))
 932                 return;
 933
 934         n = mtu2blksize(dev) - 26;
 935         n /= 7;
 936
 937         if (n > 32)
 938                 n = 32;
 939
 940         size = 2 + 26 + 7 * n;
 941
 942         if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
 943                 return;
 944
 945         skb->dev = dev;
 946         ptr = skb_put(skb, size);
 947
 948         *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
 949         *ptr++ = 2; /* ECO */
 950         *ptr++ = 0;
 951         *ptr++ = 0;
 952         dn_dn2eth(ptr, ifa->ifa_local);
 953         src = ptr;
 954         ptr += ETH_ALEN;
 955         *ptr++ = dn_db->parms.forwarding == 1 ?
 956                         DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
 957         *((unsigned short *)ptr) = dn_htons(mtu2blksize(dev));
 958         ptr += 2;
 959         *ptr++ = dn_db->parms.priority; /* Priority */
 960         *ptr++ = 0; /* Area: Reserved */
 961         *((unsigned short *)ptr) = dn_htons((unsigned short)dn_db->parms.t3);
 962         ptr += 2;
 963         *ptr++ = 0; /* MPD: Reserved */
 964         i1 = ptr++;
 965         memset(ptr, 0, 7); /* Name: Reserved */
 966         ptr += 7;
 967         i2 = ptr++;
 968
 969         n = dn_neigh_elist(dev, ptr, n);
 970
 971         *i2 = 7 * n;
 972         *i1 = 8 + *i2;
 973
 974         skb_trim(skb, (27 + *i2));
 975
 976         pktlen = (unsigned short *)skb_push(skb, 2);
 977         *pktlen = dn_htons(skb->len - 2);
 978
 979         skb->nh.raw = skb->data;
 980
 981         if (dn_am_i_a_router(dn, dn_db, ifa)) {
 982                 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
 983                 if (skb2) {
 984                         dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
 985                 }
 986         }
 987
 988         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
 989 }
 990
 991 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 992 {
 993         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 994
 995         if (dn_db->parms.forwarding == 0)
 996                 dn_send_endnode_hello(dev, ifa);
 997         else
 998                 dn_send_router_hello(dev, ifa);
 999 }
1000
1001 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1002 {
1003         int tdlen = 16;
1004         int size = dev->hard_header_len + 2 + 4 + tdlen;
1005         struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1006         int i;
1007         unsigned char *ptr;
1008         char src[ETH_ALEN];
1009
1010         if (skb == NULL)
1011                 return ;
1012
1013         skb->dev = dev;
1014         skb_push(skb, dev->hard_header_len);
1015         ptr = skb_put(skb, 2 + 4 + tdlen);
1016
1017         *ptr++ = DN_RT_PKT_HELO;
1018         *((dn_address *)ptr) = ifa->ifa_local;
1019         ptr += 2;
1020         *ptr++ = tdlen;
1021
1022         for(i = 0; i < tdlen; i++)
1023                 *ptr++ = 0252;
1024
1025         dn_dn2eth(src, ifa->ifa_local);
1026         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1027 }
1028
1029 static int dn_eth_up(struct net_device *dev)
1030 {
1031         struct dn_dev *dn_db = dev->dn_ptr;
1032
1033         if (dn_db->parms.forwarding == 0)
1034                 dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1035         else
1036                 dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1037
1038         dev_mc_upload(dev);
1039
1040         dn_db->use_long = 1;
1041
1042         return 0;
1043 }
1044
1045 static void dn_eth_down(struct net_device *dev)
1046 {
1047         struct dn_dev *dn_db = dev->dn_ptr;
1048
1049         if (dn_db->parms.forwarding == 0)
1050                 dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1051         else
1052                 dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1053 }
1054
1055 static void dn_dev_set_timer(struct net_device *dev);
1056
1057 static void dn_dev_timer_func(unsigned long arg)
1058 {
1059         struct net_device *dev = (struct net_device *)arg;
1060         struct dn_dev *dn_db = dev->dn_ptr;
1061         struct dn_ifaddr *ifa;
1062
1063         if (dn_db->t3 <= dn_db->parms.t2) {
1064                 if (dn_db->parms.timer3) {
1065                         for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
1066                                 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1067                                         dn_db->parms.timer3(dev, ifa);
1068                         }
1069                 }
1070                 dn_db->t3 = dn_db->parms.t3;
1071         } else {
1072                 dn_db->t3 -= dn_db->parms.t2;
1073         }
1074
1075         dn_dev_set_timer(dev);
1076 }
1077
1078 static void dn_dev_set_timer(struct net_device *dev)
1079 {
1080         struct dn_dev *dn_db = dev->dn_ptr;
1081
1082         if (dn_db->parms.t2 > dn_db->parms.t3)
1083                 dn_db->parms.t2 = dn_db->parms.t3;
1084
1085         dn_db->timer.data = (unsigned long)dev;
1086         dn_db->timer.function = dn_dev_timer_func;
1087         dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1088
1089         add_timer(&dn_db->timer);
1090 }
1091
1092 struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1093 {
1094         int i;
1095         struct dn_dev_parms *p = dn_dev_list;
1096         struct dn_dev *dn_db;
1097
1098         for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1099                 if (p->type == dev->type)
1100                         break;
1101         }
1102
1103         *err = -ENODEV;
1104         if (i == DN_DEV_LIST_SIZE)
1105                 return NULL;
1106
1107         *err = -ENOBUFS;
1108         if ((dn_db = kmalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1109                 return NULL;
1110
1111         memset(dn_db, 0, sizeof(struct dn_dev));
1112         memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1113         smp_wmb();
1114         dev->dn_ptr = dn_db;
1115         dn_db->dev = dev;
1116         init_timer(&dn_db->timer);
1117
1118         dn_db->uptime = jiffies;
1119         if (dn_db->parms.up) {
1120                 if (dn_db->parms.up(dev) < 0) {
1121                         dev->dn_ptr = NULL;
1122                         kfree(dn_db);
1123                         return NULL;
1124                 }
1125         }
1126
1127         dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1128
1129         dn_dev_sysctl_register(dev, &dn_db->parms);
1130
1131         dn_dev_set_timer(dev);
1132
1133         *err = 0;
1134         return dn_db;
1135 }
1136
1137
1138 /*
1139  * This processes a device up event. We only start up
1140  * the loopback device & ethernet devices with correct
1141  * MAC addreses automatically. Others must be started
1142  * specifically.
1143  *
1144  * FIXME: How should we configure the loopback address ? If we could dispense
1145  * with using decnet_address here and for autobind, it will be one less thing
1146  * for users to worry about setting up.
1147  */
1148
1149 void dn_dev_up(struct net_device *dev)
1150 {
1151         struct dn_ifaddr *ifa;
1152         dn_address addr = decnet_address;
1153         int maybe_default = 0;
1154         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1155
1156         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1157                 return;
1158
1159         /*
1160          * Need to ensure that loopback device has a dn_db attached to it
1161          * to allow creation of neighbours against it, even though it might
1162          * not have a local address of its own. Might as well do the same for
1163          * all autoconfigured interfaces.
1164          */
1165         if (dn_db == NULL) {
1166                 int err;
1167                 dn_db = dn_dev_create(dev, &err);
1168                 if (dn_db == NULL)
1169                         return;
1170         }
1171
1172         if (dev->type == ARPHRD_ETHER) {
1173                 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1174                         return;
1175                 addr = dn_htons(dn_eth2dn(dev->dev_addr));
1176                 maybe_default = 1;
1177         }
1178
1179         if (addr == 0)
1180                 return;
1181
1182         if ((ifa = dn_dev_alloc_ifa()) == NULL)
1183                 return;
1184
1185         ifa->ifa_local = ifa->ifa_address = addr;
1186         ifa->ifa_flags = 0;
1187         ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1188         strcpy(ifa->ifa_label, dev->name);
1189
1190         dn_dev_set_ifa(dev, ifa);
1191
1192         /*
1193          * Automagically set the default device to the first automatically
1194          * configured ethernet card in the system.
1195          */
1196         if (maybe_default) {
1197                 dev_hold(dev);
1198                 if (dn_dev_set_default(dev, 0))
1199                         dev_put(dev);
1200         }
1201 }
1202
1203 static void dn_dev_delete(struct net_device *dev)
1204 {
1205         struct dn_dev *dn_db = dev->dn_ptr;
1206
1207         if (dn_db == NULL)
1208                 return;
1209
1210         del_timer_sync(&dn_db->timer);
1211         dn_dev_sysctl_unregister(&dn_db->parms);
1212         dn_dev_check_default(dev);
1213         neigh_ifdown(&dn_neigh_table, dev);
1214
1215         if (dn_db->parms.down)
1216                 dn_db->parms.down(dev);
1217
1218         dev->dn_ptr = NULL;
1219
1220         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1221         neigh_ifdown(&dn_neigh_table, dev);
1222
1223         if (dn_db->router)
1224                 neigh_release(dn_db->router);
1225         if (dn_db->peer)
1226                 neigh_release(dn_db->peer);
1227
1228         kfree(dn_db);
1229 }
1230
1231 void dn_dev_down(struct net_device *dev)
1232 {
1233         struct dn_dev *dn_db = dev->dn_ptr;
1234         struct dn_ifaddr *ifa;
1235
1236         if (dn_db == NULL)
1237                 return;
1238
1239         while((ifa = dn_db->ifa_list) != NULL) {
1240                 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1241                 dn_dev_free_ifa(ifa);
1242         }
1243
1244         dn_dev_delete(dev);
1245 }
1246
1247 void dn_dev_init_pkt(struct sk_buff *skb)
1248 {
1249         return;
1250 }
1251
1252 void dn_dev_veri_pkt(struct sk_buff *skb)
1253 {
1254         return;
1255 }
1256
1257 void dn_dev_hello(struct sk_buff *skb)
1258 {
1259         return;
1260 }
1261
1262 void dn_dev_devices_off(void)
1263 {
1264         struct net_device *dev;
1265
1266         rtnl_lock();
1267         for(dev = dev_base; dev; dev = dev->next)
1268                 dn_dev_down(dev);
1269         rtnl_unlock();
1270
1271 }
1272
1273 void dn_dev_devices_on(void)
1274 {
1275         struct net_device *dev;
1276
1277         rtnl_lock();
1278         for(dev = dev_base; dev; dev = dev->next) {
1279                 if (dev->flags & IFF_UP)
1280                         dn_dev_up(dev);
1281         }
1282         rtnl_unlock();
1283 }
1284
1285 int register_dnaddr_notifier(struct notifier_block *nb)
1286 {
1287         return notifier_chain_register(&dnaddr_chain, nb);
1288 }
1289
1290 int unregister_dnaddr_notifier(struct notifier_block *nb)
1291 {
1292         return notifier_chain_unregister(&dnaddr_chain, nb);
1293 }
1294
1295 #ifdef CONFIG_PROC_FS
1296 static inline struct net_device *dn_dev_get_next(struct seq_file *seq, struct net_device *dev)
1297 {
1298         do {
1299                 dev = dev->next;
1300         } while(dev && !dev->dn_ptr);
1301
1302         return dev;
1303 }
1304
1305 static struct net_device *dn_dev_get_idx(struct seq_file *seq, loff_t pos)
1306 {
1307         struct net_device *dev;
1308
1309         dev = dev_base;
1310         if (dev && !dev->dn_ptr)
1311                 dev = dn_dev_get_next(seq, dev);
1312         if (pos) {
1313                 while(dev && (dev = dn_dev_get_next(seq, dev)))
1314                         --pos;
1315         }
1316         return dev;
1317 }
1318
1319 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1320 {
1321         if (*pos) {
1322                 struct net_device *dev;
1323                 read_lock(&dev_base_lock);
1324                 dev = dn_dev_get_idx(seq, *pos - 1);
1325                 if (dev == NULL)
1326                         read_unlock(&dev_base_lock);
1327                 return dev;
1328         }
1329         return SEQ_START_TOKEN;
1330 }
1331
1332 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1333 {
1334         struct net_device *dev = v;
1335         loff_t one = 1;
1336
1337         if (v == SEQ_START_TOKEN) {
1338                 dev = dn_dev_seq_start(seq, &one);
1339         } else {
1340                 dev = dn_dev_get_next(seq, dev);
1341                 if (dev == NULL)
1342                         read_unlock(&dev_base_lock);
1343         }
1344         ++*pos;
1345         return dev;
1346 }
1347
1348 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1349 {
1350         if (v && v != SEQ_START_TOKEN)
1351                 read_unlock(&dev_base_lock);
1352 }
1353
1354 static char *dn_type2asc(char type)
1355 {
1356         switch(type) {
1357                 case DN_DEV_BCAST:
1358                         return "B";
1359                 case DN_DEV_UCAST:
1360                         return "U";
1361                 case DN_DEV_MPOINT:
1362                         return "M";
1363         }
1364
1365         return "?";
1366 }
1367
1368 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1369 {
1370         if (v == SEQ_START_TOKEN)
1371                 seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1372         else {
1373                 struct net_device *dev = v;
1374                 char peer_buf[DN_ASCBUF_LEN];
1375                 char router_buf[DN_ASCBUF_LEN];
1376                 struct dn_dev *dn_db = dev->dn_ptr;
1377
1378                 seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1379                                 "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1380                                 dev->name ? dev->name : "???",
1381                                 dn_type2asc(dn_db->parms.mode),
1382                                 0, 0,
1383                                 dn_db->t3, dn_db->parms.t3,
1384                                 mtu2blksize(dev),
1385                                 dn_db->parms.priority,
1386                                 dn_db->parms.state, dn_db->parms.name,
1387                                 dn_db->router ? dn_addr2asc(dn_ntohs(*(dn_address *)dn_db->router->primary_key), router_buf) : "",
1388                                 dn_db->peer ? dn_addr2asc(dn_ntohs(*(dn_address *)dn_db->peer->primary_key), peer_buf) : "");
1389         }
1390         return 0;
1391 }
1392
1393 static struct seq_operations dn_dev_seq_ops = {
1394         .start  = dn_dev_seq_start,
1395         .next   = dn_dev_seq_next,
1396         .stop   = dn_dev_seq_stop,
1397         .show   = dn_dev_seq_show,
1398 };
1399
1400 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1401 {
1402         return seq_open(file, &dn_dev_seq_ops);
1403 }
1404
1405 static struct file_operations dn_dev_seq_fops = {
1406         .owner   = THIS_MODULE,
1407         .open    = dn_dev_seq_open,
1408         .read    = seq_read,
1409         .llseek  = seq_lseek,
1410         .release = seq_release,
1411 };
1412
1413 #endif /* CONFIG_PROC_FS */
1414
1415 static struct rtnetlink_link dnet_rtnetlink_table[RTM_NR_MSGTYPES] =
1416 {
1417         [RTM_NEWADDR  - RTM_BASE] = { .doit     = dn_dev_rtm_newaddr,   },
1418         [RTM_DELADDR  - RTM_BASE] = { .doit     = dn_dev_rtm_deladdr,   },
1419         [RTM_GETADDR  - RTM_BASE] = { .dumpit   = dn_dev_dump_ifaddr,   },
1420 #ifdef CONFIG_DECNET_ROUTER
1421         [RTM_NEWROUTE - RTM_BASE] = { .doit     = dn_fib_rtm_newroute,  },
1422         [RTM_DELROUTE - RTM_BASE] = { .doit     = dn_fib_rtm_delroute,  },
1423         [RTM_GETROUTE - RTM_BASE] = { .doit     = dn_cache_getroute,
1424                                       .dumpit   = dn_fib_dump,          },
1425         [RTM_NEWRULE  - RTM_BASE] = { .doit     = dn_fib_rtm_newrule,   },
1426         [RTM_DELRULE  - RTM_BASE] = { .doit     = dn_fib_rtm_delrule,   },
1427         [RTM_GETRULE  - RTM_BASE] = { .dumpit   = dn_fib_dump_rules,    },
1428 #else
1429         [RTM_GETROUTE - RTM_BASE] = { .doit     = dn_cache_getroute,
1430                                       .dumpit   = dn_cache_dump,        },
1431 #endif
1432
1433 };
1434
1435 static int __initdata addr[2];
1436 module_param_array(addr, int, NULL, 0444);
1437 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1438
1439 void __init dn_dev_init(void)
1440 {
1441         if (addr[0] > 63 || addr[0] < 0) {
1442                 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1443                 return;
1444         }
1445
1446         if (addr[1] > 1023 || addr[1] < 0) {
1447                 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1448                 return;
1449         }
1450
1451         decnet_address = dn_htons((addr[0] << 10) | addr[1]);
1452
1453         dn_dev_devices_on();
1454
1455         rtnetlink_links[PF_DECnet] = dnet_rtnetlink_table;
1456
1457         proc_net_fops_create("decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1458
1459 #ifdef CONFIG_SYSCTL
1460         {
1461                 int i;
1462                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1463                         dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1464         }
1465 #endif /* CONFIG_SYSCTL */
1466 }
1467
1468 void __exit dn_dev_cleanup(void)
1469 {
1470         rtnetlink_links[PF_DECnet] = NULL;
1471
1472 #ifdef CONFIG_SYSCTL
1473         {
1474                 int i;
1475                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1476                         dn_dev_sysctl_unregister(&dn_dev_list[i]);
1477         }
1478 #endif /* CONFIG_SYSCTL */
1479
1480         proc_net_remove("decnet_dev");
1481
1482         dn_dev_devices_off();
1483 }