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   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/capability.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_addr.h>
  38 #include <linux/if_arp.h>
  39 #include <linux/if_ether.h>
  40 #include <linux/skbuff.h>
  41 #include <linux/sysctl.h>
  42 #include <linux/notifier.h>
  43 #include <asm/uaccess.h>
  44 #include <asm/system.h>
  45 #include <net/net_namespace.h>
  46 #include <net/neighbour.h>
  47 #include <net/dst.h>
  48 #include <net/flow.h>
  49 #include <net/fib_rules.h>
  50 #include <net/netlink.h>
  51 #include <net/dn.h>
  52 #include <net/dn_dev.h>
  53 #include <net/dn_route.h>
  54 #include <net/dn_neigh.h>
  55 #include <net/dn_fib.h>
  56
  57 #define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
  58
  59 static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
  60 static char dn_rt_all_rt_mcast[ETH_ALEN]  = {0xAB,0x00,0x00,0x03,0x00,0x00};
  61 static char dn_hiord[ETH_ALEN]            = {0xAA,0x00,0x04,0x00,0x00,0x00};
  62 static unsigned char dn_eco_version[3]    = {0x02,0x00,0x00};
  63
  64 extern struct neigh_table dn_neigh_table;
  65
  66 /*
  67  * decnet_address is kept in network order.
  68  */
  69 __le16 decnet_address = 0;
  70
  71 static DEFINE_RWLOCK(dndev_lock);
  72 static struct net_device *decnet_default_device;
  73 static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
  74
  75 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
  76 static void dn_dev_delete(struct net_device *dev);
  77 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa);
  78
  79 static int dn_eth_up(struct net_device *);
  80 static void dn_eth_down(struct net_device *);
  81 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  82 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  83
  84 static struct dn_dev_parms dn_dev_list[] =  {
  85 {
  86         .type =         ARPHRD_ETHER, /* Ethernet */
  87         .mode =         DN_DEV_BCAST,
  88         .state =        DN_DEV_S_RU,
  89         .t2 =           1,
  90         .t3 =           10,
  91         .name =         "ethernet",
  92         .ctl_name =     NET_DECNET_CONF_ETHER,
  93         .up =           dn_eth_up,
  94         .down =         dn_eth_down,
  95         .timer3 =       dn_send_brd_hello,
  96 },
  97 {
  98         .type =         ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
  99         .mode =         DN_DEV_BCAST,
 100         .state =        DN_DEV_S_RU,
 101         .t2 =           1,
 102         .t3 =           10,
 103         .name =         "ipgre",
 104         .ctl_name =     NET_DECNET_CONF_GRE,
 105         .timer3 =       dn_send_brd_hello,
 106 },
 107 #if 0
 108 {
 109         .type =         ARPHRD_X25, /* Bog standard X.25 */
 110         .mode =         DN_DEV_UCAST,
 111         .state =        DN_DEV_S_DS,
 112         .t2 =           1,
 113         .t3 =           120,
 114         .name =         "x25",
 115         .ctl_name =     NET_DECNET_CONF_X25,
 116         .timer3 =       dn_send_ptp_hello,
 117 },
 118 #endif
 119 #if 0
 120 {
 121         .type =         ARPHRD_PPP, /* DECnet over PPP */
 122         .mode =         DN_DEV_BCAST,
 123         .state =        DN_DEV_S_RU,
 124         .t2 =           1,
 125         .t3 =           10,
 126         .name =         "ppp",
 127         .ctl_name =     NET_DECNET_CONF_PPP,
 128         .timer3 =       dn_send_brd_hello,
 129 },
 130 #endif
 131 {
 132         .type =         ARPHRD_DDCMP, /* DECnet over DDCMP */
 133         .mode =         DN_DEV_UCAST,
 134         .state =        DN_DEV_S_DS,
 135         .t2 =           1,
 136         .t3 =           120,
 137         .name =         "ddcmp",
 138         .ctl_name =     NET_DECNET_CONF_DDCMP,
 139         .timer3 =       dn_send_ptp_hello,
 140 },
 141 {
 142         .type =         ARPHRD_LOOPBACK, /* Loopback interface - always last */
 143         .mode =         DN_DEV_BCAST,
 144         .state =        DN_DEV_S_RU,
 145         .t2 =           1,
 146         .t3 =           10,
 147         .name =         "loopback",
 148         .ctl_name =     NET_DECNET_CONF_LOOPBACK,
 149         .timer3 =       dn_send_brd_hello,
 150 }
 151 };
 152
 153 #define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)
 154
 155 #define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x)
 156
 157 #ifdef CONFIG_SYSCTL
 158
 159 static int min_t2[] = { 1 };
 160 static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
 161 static int min_t3[] = { 1 };
 162 static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
 163
 164 static int min_priority[1];
 165 static int max_priority[] = { 127 }; /* From DECnet spec */
 166
 167 static int dn_forwarding_proc(ctl_table *, int,
 168                         void __user *, size_t *, loff_t *);
 169 static int dn_forwarding_sysctl(ctl_table *table,
 170                         void __user *oldval, size_t __user *oldlenp,
 171                         void __user *newval, size_t newlen);
 172
 173 static struct dn_dev_sysctl_table {
 174         struct ctl_table_header *sysctl_header;
 175         ctl_table dn_dev_vars[5];
 176 } dn_dev_sysctl = {
 177         NULL,
 178         {
 179         {
 180                 .ctl_name = NET_DECNET_CONF_DEV_FORWARDING,
 181                 .procname = "forwarding",
 182                 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
 183                 .maxlen = sizeof(int),
 184                 .mode = 0644,
 185                 .proc_handler = dn_forwarding_proc,
 186                 .strategy = dn_forwarding_sysctl,
 187         },
 188         {
 189                 .ctl_name = NET_DECNET_CONF_DEV_PRIORITY,
 190                 .procname = "priority",
 191                 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
 192                 .maxlen = sizeof(int),
 193                 .mode = 0644,
 194                 .proc_handler = proc_dointvec_minmax,
 195                 .strategy = sysctl_intvec,
 196                 .extra1 = &min_priority,
 197                 .extra2 = &max_priority
 198         },
 199         {
 200                 .ctl_name = NET_DECNET_CONF_DEV_T2,
 201                 .procname = "t2",
 202                 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
 203                 .maxlen = sizeof(int),
 204                 .mode = 0644,
 205                 .proc_handler = proc_dointvec_minmax,
 206                 .strategy = sysctl_intvec,
 207                 .extra1 = &min_t2,
 208                 .extra2 = &max_t2
 209         },
 210         {
 211                 .ctl_name = NET_DECNET_CONF_DEV_T3,
 212                 .procname = "t3",
 213                 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
 214                 .maxlen = sizeof(int),
 215                 .mode = 0644,
 216                 .proc_handler = proc_dointvec_minmax,
 217                 .strategy = sysctl_intvec,
 218                 .extra1 = &min_t3,
 219                 .extra2 = &max_t3
 220         },
 221         {0}
 222         },
 223 };
 224
 225 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 226 {
 227         struct dn_dev_sysctl_table *t;
 228         int i;
 229
 230 #define DN_CTL_PATH_DEV 3
 231
 232         struct ctl_path dn_ctl_path[] = {
 233                 { .procname = "net", .ctl_name = CTL_NET, },
 234                 { .procname = "decnet", .ctl_name = NET_DECNET, },
 235                 { .procname = "conf", .ctl_name = NET_DECNET_CONF, },
 236                 { /* to be set */ },
 237                 { },
 238         };
 239
 240         t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
 241         if (t == NULL)
 242                 return;
 243
 244         for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
 245                 long offset = (long)t->dn_dev_vars[i].data;
 246                 t->dn_dev_vars[i].data = ((char *)parms) + offset;
 247         }
 248
 249         if (dev) {
 250                 dn_ctl_path[DN_CTL_PATH_DEV].procname = dev->name;
 251                 dn_ctl_path[DN_CTL_PATH_DEV].ctl_name = dev->ifindex;
 252         } else {
 253                 dn_ctl_path[DN_CTL_PATH_DEV].procname = parms->name;
 254                 dn_ctl_path[DN_CTL_PATH_DEV].ctl_name = parms->ctl_name;
 255         }
 256
 257         t->dn_dev_vars[0].extra1 = (void *)dev;
 258
 259         t->sysctl_header = register_sysctl_paths(dn_ctl_path, t->dn_dev_vars);
 260         if (t->sysctl_header == NULL)
 261                 kfree(t);
 262         else
 263                 parms->sysctl = t;
 264 }
 265
 266 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 267 {
 268         if (parms->sysctl) {
 269                 struct dn_dev_sysctl_table *t = parms->sysctl;
 270                 parms->sysctl = NULL;
 271                 unregister_sysctl_table(t->sysctl_header);
 272                 kfree(t);
 273         }
 274 }
 275
 276 static int dn_forwarding_proc(ctl_table *table, int write,
 277                                 void __user *buffer,
 278                                 size_t *lenp, loff_t *ppos)
 279 {
 280 #ifdef CONFIG_DECNET_ROUTER
 281         struct net_device *dev = table->extra1;
 282         struct dn_dev *dn_db;
 283         int err;
 284         int tmp, old;
 285
 286         if (table->extra1 == NULL)
 287                 return -EINVAL;
 288
 289         dn_db = dev->dn_ptr;
 290         old = dn_db->parms.forwarding;
 291
 292         err = proc_dointvec(table, write, buffer, lenp, ppos);
 293
 294         if ((err >= 0) && write) {
 295                 if (dn_db->parms.forwarding < 0)
 296                         dn_db->parms.forwarding = 0;
 297                 if (dn_db->parms.forwarding > 2)
 298                         dn_db->parms.forwarding = 2;
 299                 /*
 300                  * What an ugly hack this is... its works, just. It
 301                  * would be nice if sysctl/proc were just that little
 302                  * bit more flexible so I don't have to write a special
 303                  * routine, or suffer hacks like this - SJW
 304                  */
 305                 tmp = dn_db->parms.forwarding;
 306                 dn_db->parms.forwarding = old;
 307                 if (dn_db->parms.down)
 308                         dn_db->parms.down(dev);
 309                 dn_db->parms.forwarding = tmp;
 310                 if (dn_db->parms.up)
 311                         dn_db->parms.up(dev);
 312         }
 313
 314         return err;
 315 #else
 316         return -EINVAL;
 317 #endif
 318 }
 319
 320 static int dn_forwarding_sysctl(ctl_table *table,
 321                         void __user *oldval, size_t __user *oldlenp,
 322                         void __user *newval, size_t newlen)
 323 {
 324 #ifdef CONFIG_DECNET_ROUTER
 325         struct net_device *dev = table->extra1;
 326         struct dn_dev *dn_db;
 327         int value;
 328
 329         if (table->extra1 == NULL)
 330                 return -EINVAL;
 331
 332         dn_db = dev->dn_ptr;
 333
 334         if (newval && newlen) {
 335                 if (newlen != sizeof(int))
 336                         return -EINVAL;
 337
 338                 if (get_user(value, (int __user *)newval))
 339                         return -EFAULT;
 340                 if (value < 0)
 341                         return -EINVAL;
 342                 if (value > 2)
 343                         return -EINVAL;
 344
 345                 if (dn_db->parms.down)
 346                         dn_db->parms.down(dev);
 347                 dn_db->parms.forwarding = value;
 348                 if (dn_db->parms.up)
 349                         dn_db->parms.up(dev);
 350         }
 351
 352         return 0;
 353 #else
 354         return -EINVAL;
 355 #endif
 356 }
 357
 358 #else /* CONFIG_SYSCTL */
 359 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 360 {
 361 }
 362 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 363 {
 364 }
 365
 366 #endif /* CONFIG_SYSCTL */
 367
 368 static inline __u16 mtu2blksize(struct net_device *dev)
 369 {
 370         u32 blksize = dev->mtu;
 371         if (blksize > 0xffff)
 372                 blksize = 0xffff;
 373
 374         if (dev->type == ARPHRD_ETHER ||
 375             dev->type == ARPHRD_PPP ||
 376             dev->type == ARPHRD_IPGRE ||
 377             dev->type == ARPHRD_LOOPBACK)
 378                 blksize -= 2;
 379
 380         return (__u16)blksize;
 381 }
 382
 383 static struct dn_ifaddr *dn_dev_alloc_ifa(void)
 384 {
 385         struct dn_ifaddr *ifa;
 386
 387         ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
 388
 389         return ifa;
 390 }
 391
 392 static __inline__ void dn_dev_free_ifa(struct dn_ifaddr *ifa)
 393 {
 394         kfree(ifa);
 395 }
 396
 397 static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr **ifap, int destroy)
 398 {
 399         struct dn_ifaddr *ifa1 = *ifap;
 400         unsigned char mac_addr[6];
 401         struct net_device *dev = dn_db->dev;
 402
 403         ASSERT_RTNL();
 404
 405         *ifap = ifa1->ifa_next;
 406
 407         if (dn_db->dev->type == ARPHRD_ETHER) {
 408                 if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
 409                         dn_dn2eth(mac_addr, ifa1->ifa_local);
 410                         dev_mc_delete(dev, mac_addr, ETH_ALEN, 0);
 411                 }
 412         }
 413
 414         dn_ifaddr_notify(RTM_DELADDR, ifa1);
 415         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
 416         if (destroy) {
 417                 dn_dev_free_ifa(ifa1);
 418
 419                 if (dn_db->ifa_list == NULL)
 420                         dn_dev_delete(dn_db->dev);
 421         }
 422 }
 423
 424 static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 425 {
 426         struct net_device *dev = dn_db->dev;
 427         struct dn_ifaddr *ifa1;
 428         unsigned char mac_addr[6];
 429
 430         ASSERT_RTNL();
 431
 432         /* Check for duplicates */
 433         for(ifa1 = dn_db->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
 434                 if (ifa1->ifa_local == ifa->ifa_local)
 435                         return -EEXIST;
 436         }
 437
 438         if (dev->type == ARPHRD_ETHER) {
 439                 if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
 440                         dn_dn2eth(mac_addr, ifa->ifa_local);
 441                         dev_mc_add(dev, mac_addr, ETH_ALEN, 0);
 442                 }
 443         }
 444
 445         ifa->ifa_next = dn_db->ifa_list;
 446         dn_db->ifa_list = ifa;
 447
 448         dn_ifaddr_notify(RTM_NEWADDR, ifa);
 449         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
 450
 451         return 0;
 452 }
 453
 454 static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
 455 {
 456         struct dn_dev *dn_db = dev->dn_ptr;
 457         int rv;
 458
 459         if (dn_db == NULL) {
 460                 int err;
 461                 dn_db = dn_dev_create(dev, &err);
 462                 if (dn_db == NULL)
 463                         return err;
 464         }
 465
 466         ifa->ifa_dev = dn_db;
 467
 468         if (dev->flags & IFF_LOOPBACK)
 469                 ifa->ifa_scope = RT_SCOPE_HOST;
 470
 471         rv = dn_dev_insert_ifa(dn_db, ifa);
 472         if (rv)
 473                 dn_dev_free_ifa(ifa);
 474         return rv;
 475 }
 476
 477
 478 int dn_dev_ioctl(unsigned int cmd, void __user *arg)
 479 {
 480         char buffer[DN_IFREQ_SIZE];
 481         struct ifreq *ifr = (struct ifreq *)buffer;
 482         struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
 483         struct dn_dev *dn_db;
 484         struct net_device *dev;
 485         struct dn_ifaddr *ifa = NULL, **ifap = NULL;
 486         int ret = 0;
 487
 488         if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
 489                 return -EFAULT;
 490         ifr->ifr_name[IFNAMSIZ-1] = 0;
 491
 492         dev_load(&init_net, ifr->ifr_name);
 493
 494         switch(cmd) {
 495                 case SIOCGIFADDR:
 496                         break;
 497                 case SIOCSIFADDR:
 498                         if (!capable(CAP_NET_ADMIN))
 499                                 return -EACCES;
 500                         if (sdn->sdn_family != AF_DECnet)
 501                                 return -EINVAL;
 502                         break;
 503                 default:
 504                         return -EINVAL;
 505         }
 506
 507         rtnl_lock();
 508
 509         if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
 510                 ret = -ENODEV;
 511                 goto done;
 512         }
 513
 514         if ((dn_db = dev->dn_ptr) != NULL) {
 515                 for (ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next)
 516                         if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
 517                                 break;
 518         }
 519
 520         if (ifa == NULL && cmd != SIOCSIFADDR) {
 521                 ret = -EADDRNOTAVAIL;
 522                 goto done;
 523         }
 524
 525         switch(cmd) {
 526                 case SIOCGIFADDR:
 527                         *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
 528                         goto rarok;
 529
 530                 case SIOCSIFADDR:
 531                         if (!ifa) {
 532                                 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
 533                                         ret = -ENOBUFS;
 534                                         break;
 535                                 }
 536                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 537                         } else {
 538                                 if (ifa->ifa_local == dn_saddr2dn(sdn))
 539                                         break;
 540                                 dn_dev_del_ifa(dn_db, ifap, 0);
 541                         }
 542
 543                         ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
 544
 545                         ret = dn_dev_set_ifa(dev, ifa);
 546         }
 547 done:
 548         rtnl_unlock();
 549
 550         return ret;
 551 rarok:
 552         if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
 553                 ret = -EFAULT;
 554         goto done;
 555 }
 556
 557 struct net_device *dn_dev_get_default(void)
 558 {
 559         struct net_device *dev;
 560         read_lock(&dndev_lock);
 561         dev = decnet_default_device;
 562         if (dev) {
 563                 if (dev->dn_ptr)
 564                         dev_hold(dev);
 565                 else
 566                         dev = NULL;
 567         }
 568         read_unlock(&dndev_lock);
 569         return dev;
 570 }
 571
 572 int dn_dev_set_default(struct net_device *dev, int force)
 573 {
 574         struct net_device *old = NULL;
 575         int rv = -EBUSY;
 576         if (!dev->dn_ptr)
 577                 return -ENODEV;
 578         write_lock(&dndev_lock);
 579         if (force || decnet_default_device == NULL) {
 580                 old = decnet_default_device;
 581                 decnet_default_device = dev;
 582                 rv = 0;
 583         }
 584         write_unlock(&dndev_lock);
 585         if (old)
 586                 dev_put(old);
 587         return rv;
 588 }
 589
 590 static void dn_dev_check_default(struct net_device *dev)
 591 {
 592         write_lock(&dndev_lock);
 593         if (dev == decnet_default_device) {
 594                 decnet_default_device = NULL;
 595         } else {
 596                 dev = NULL;
 597         }
 598         write_unlock(&dndev_lock);
 599         if (dev)
 600                 dev_put(dev);
 601 }
 602
 603 static struct dn_dev *dn_dev_by_index(int ifindex)
 604 {
 605         struct net_device *dev;
 606         struct dn_dev *dn_dev = NULL;
 607         dev = dev_get_by_index(&init_net, ifindex);
 608         if (dev) {
 609                 dn_dev = dev->dn_ptr;
 610                 dev_put(dev);
 611         }
 612
 613         return dn_dev;
 614 }
 615
 616 static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
 617         [IFA_ADDRESS]           = { .type = NLA_U16 },
 618         [IFA_LOCAL]             = { .type = NLA_U16 },
 619         [IFA_LABEL]             = { .type = NLA_STRING,
 620                                     .len = IFNAMSIZ - 1 },
 621 };
 622
 623 static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 624 {
 625         struct net *net = sock_net(skb->sk);
 626         struct nlattr *tb[IFA_MAX+1];
 627         struct dn_dev *dn_db;
 628         struct ifaddrmsg *ifm;
 629         struct dn_ifaddr *ifa, **ifap;
 630         int err = -EINVAL;
 631
 632         if (net != &init_net)
 633                 goto errout;
 634
 635         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
 636         if (err < 0)
 637                 goto errout;
 638
 639         err = -ENODEV;
 640         ifm = nlmsg_data(nlh);
 641         if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
 642                 goto errout;
 643
 644         err = -EADDRNOTAVAIL;
 645         for (ifap = &dn_db->ifa_list; (ifa = *ifap); ifap = &ifa->ifa_next) {
 646                 if (tb[IFA_LOCAL] &&
 647                     nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
 648                         continue;
 649
 650                 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
 651                         continue;
 652
 653                 dn_dev_del_ifa(dn_db, ifap, 1);
 654                 return 0;
 655         }
 656
 657 errout:
 658         return err;
 659 }
 660
 661 static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 662 {
 663         struct net *net = sock_net(skb->sk);
 664         struct nlattr *tb[IFA_MAX+1];
 665         struct net_device *dev;
 666         struct dn_dev *dn_db;
 667         struct ifaddrmsg *ifm;
 668         struct dn_ifaddr *ifa;
 669         int err;
 670
 671         if (net != &init_net)
 672                 return -EINVAL;
 673
 674         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
 675         if (err < 0)
 676                 return err;
 677
 678         if (tb[IFA_LOCAL] == NULL)
 679                 return -EINVAL;
 680
 681         ifm = nlmsg_data(nlh);
 682         if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
 683                 return -ENODEV;
 684
 685         if ((dn_db = dev->dn_ptr) == NULL) {
 686                 dn_db = dn_dev_create(dev, &err);
 687                 if (!dn_db)
 688                         return err;
 689         }
 690
 691         if ((ifa = dn_dev_alloc_ifa()) == NULL)
 692                 return -ENOBUFS;
 693
 694         if (tb[IFA_ADDRESS] == NULL)
 695                 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
 696
 697         ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
 698         ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
 699         ifa->ifa_flags = ifm->ifa_flags;
 700         ifa->ifa_scope = ifm->ifa_scope;
 701         ifa->ifa_dev = dn_db;
 702
 703         if (tb[IFA_LABEL])
 704                 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
 705         else
 706                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 707
 708         err = dn_dev_insert_ifa(dn_db, ifa);
 709         if (err)
 710                 dn_dev_free_ifa(ifa);
 711
 712         return err;
 713 }
 714
 715 static inline size_t dn_ifaddr_nlmsg_size(void)
 716 {
 717         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
 718                + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
 719                + nla_total_size(2) /* IFA_ADDRESS */
 720                + nla_total_size(2); /* IFA_LOCAL */
 721 }
 722
 723 static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
 724                              u32 pid, u32 seq, int event, unsigned int flags)
 725 {
 726         struct ifaddrmsg *ifm;
 727         struct nlmsghdr *nlh;
 728
 729         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
 730         if (nlh == NULL)
 731                 return -EMSGSIZE;
 732
 733         ifm = nlmsg_data(nlh);
 734         ifm->ifa_family = AF_DECnet;
 735         ifm->ifa_prefixlen = 16;
 736         ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
 737         ifm->ifa_scope = ifa->ifa_scope;
 738         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
 739
 740         if (ifa->ifa_address)
 741                 NLA_PUT_LE16(skb, IFA_ADDRESS, ifa->ifa_address);
 742         if (ifa->ifa_local)
 743                 NLA_PUT_LE16(skb, IFA_LOCAL, ifa->ifa_local);
 744         if (ifa->ifa_label[0])
 745                 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
 746
 747         return nlmsg_end(skb, nlh);
 748
 749 nla_put_failure:
 750         nlmsg_cancel(skb, nlh);
 751         return -EMSGSIZE;
 752 }
 753
 754 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
 755 {
 756         struct sk_buff *skb;
 757         int err = -ENOBUFS;
 758
 759         skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
 760         if (skb == NULL)
 761                 goto errout;
 762
 763         err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
 764         if (err < 0) {
 765                 /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
 766                 WARN_ON(err == -EMSGSIZE);
 767                 kfree_skb(skb);
 768                 goto errout;
 769         }
 770         rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
 771         return;
 772 errout:
 773         if (err < 0)
 774                 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
 775 }
 776
 777 static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
 778 {
 779         struct net *net = sock_net(skb->sk);
 780         int idx, dn_idx = 0, skip_ndevs, skip_naddr;
 781         struct net_device *dev;
 782         struct dn_dev *dn_db;
 783         struct dn_ifaddr *ifa;
 784
 785         if (net != &init_net)
 786                 return 0;
 787
 788         skip_ndevs = cb->args[0];
 789         skip_naddr = cb->args[1];
 790
 791         idx = 0;
 792         for_each_netdev(&init_net, dev) {
 793                 if (idx < skip_ndevs)
 794                         goto cont;
 795                 else if (idx > skip_ndevs) {
 796                         /* Only skip over addresses for first dev dumped
 797                          * in this iteration (idx == skip_ndevs) */
 798                         skip_naddr = 0;
 799                 }
 800
 801                 if ((dn_db = dev->dn_ptr) == NULL)
 802                         goto cont;
 803
 804                 for (ifa = dn_db->ifa_list, dn_idx = 0; ifa;
 805                      ifa = ifa->ifa_next, dn_idx++) {
 806                         if (dn_idx < skip_naddr)
 807                                 continue;
 808
 809                         if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
 810                                               cb->nlh->nlmsg_seq, RTM_NEWADDR,
 811                                               NLM_F_MULTI) < 0)
 812                                 goto done;
 813                 }
 814 cont:
 815                 idx++;
 816         }
 817 done:
 818         cb->args[0] = idx;
 819         cb->args[1] = dn_idx;
 820
 821         return skb->len;
 822 }
 823
 824 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
 825 {
 826         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 827         struct dn_ifaddr *ifa;
 828         int rv = -ENODEV;
 829         if (dn_db == NULL)
 830                 goto out;
 831         ifa = dn_db->ifa_list;
 832         if (ifa != NULL) {
 833                 *addr = ifa->ifa_local;
 834                 rv = 0;
 835         }
 836 out:
 837         return rv;
 838 }
 839
 840 /*
 841  * Find a default address to bind to.
 842  *
 843  * This is one of those areas where the initial VMS concepts don't really
 844  * map onto the Linux concepts, and since we introduced multiple addresses
 845  * per interface we have to cope with slightly odd ways of finding out what
 846  * "our address" really is. Mostly it's not a problem; for this we just guess
 847  * a sensible default. Eventually the routing code will take care of all the
 848  * nasties for us I hope.
 849  */
 850 int dn_dev_bind_default(__le16 *addr)
 851 {
 852         struct net_device *dev;
 853         int rv;
 854         dev = dn_dev_get_default();
 855 last_chance:
 856         if (dev) {
 857                 read_lock(&dev_base_lock);
 858                 rv = dn_dev_get_first(dev, addr);
 859                 read_unlock(&dev_base_lock);
 860                 dev_put(dev);
 861                 if (rv == 0 || dev == init_net.loopback_dev)
 862                         return rv;
 863         }
 864         dev = init_net.loopback_dev;
 865         dev_hold(dev);
 866         goto last_chance;
 867 }
 868
 869 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 870 {
 871         struct endnode_hello_message *msg;
 872         struct sk_buff *skb = NULL;
 873         __le16 *pktlen;
 874         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 875
 876         if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
 877                 return;
 878
 879         skb->dev = dev;
 880
 881         msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
 882
 883         msg->msgflg  = 0x0D;
 884         memcpy(msg->tiver, dn_eco_version, 3);
 885         dn_dn2eth(msg->id, ifa->ifa_local);
 886         msg->iinfo   = DN_RT_INFO_ENDN;
 887         msg->blksize = cpu_to_le16(mtu2blksize(dev));
 888         msg->area    = 0x00;
 889         memset(msg->seed, 0, 8);
 890         memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
 891
 892         if (dn_db->router) {
 893                 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 894                 dn_dn2eth(msg->neighbor, dn->addr);
 895         }
 896
 897         msg->timer   = cpu_to_le16((unsigned short)dn_db->parms.t3);
 898         msg->mpd     = 0x00;
 899         msg->datalen = 0x02;
 900         memset(msg->data, 0xAA, 2);
 901
 902         pktlen = (__le16 *)skb_push(skb,2);
 903         *pktlen = cpu_to_le16(skb->len - 2);
 904
 905         skb_reset_network_header(skb);
 906
 907         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
 908 }
 909
 910
 911 #define DRDELAY (5 * HZ)
 912
 913 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 914 {
 915         /* First check time since device went up */
 916         if ((jiffies - dn_db->uptime) < DRDELAY)
 917                 return 0;
 918
 919         /* If there is no router, then yes... */
 920         if (!dn_db->router)
 921                 return 1;
 922
 923         /* otherwise only if we have a higher priority or.. */
 924         if (dn->priority < dn_db->parms.priority)
 925                 return 1;
 926
 927         /* if we have equal priority and a higher node number */
 928         if (dn->priority != dn_db->parms.priority)
 929                 return 0;
 930
 931         if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
 932                 return 1;
 933
 934         return 0;
 935 }
 936
 937 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 938 {
 939         int n;
 940         struct dn_dev *dn_db = dev->dn_ptr;
 941         struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 942         struct sk_buff *skb;
 943         size_t size;
 944         unsigned char *ptr;
 945         unsigned char *i1, *i2;
 946         __le16 *pktlen;
 947         char *src;
 948
 949         if (mtu2blksize(dev) < (26 + 7))
 950                 return;
 951
 952         n = mtu2blksize(dev) - 26;
 953         n /= 7;
 954
 955         if (n > 32)
 956                 n = 32;
 957
 958         size = 2 + 26 + 7 * n;
 959
 960         if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
 961                 return;
 962
 963         skb->dev = dev;
 964         ptr = skb_put(skb, size);
 965
 966         *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
 967         *ptr++ = 2; /* ECO */
 968         *ptr++ = 0;
 969         *ptr++ = 0;
 970         dn_dn2eth(ptr, ifa->ifa_local);
 971         src = ptr;
 972         ptr += ETH_ALEN;
 973         *ptr++ = dn_db->parms.forwarding == 1 ?
 974                         DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
 975         *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
 976         ptr += 2;
 977         *ptr++ = dn_db->parms.priority; /* Priority */
 978         *ptr++ = 0; /* Area: Reserved */
 979         *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
 980         ptr += 2;
 981         *ptr++ = 0; /* MPD: Reserved */
 982         i1 = ptr++;
 983         memset(ptr, 0, 7); /* Name: Reserved */
 984         ptr += 7;
 985         i2 = ptr++;
 986
 987         n = dn_neigh_elist(dev, ptr, n);
 988
 989         *i2 = 7 * n;
 990         *i1 = 8 + *i2;
 991
 992         skb_trim(skb, (27 + *i2));
 993
 994         pktlen = (__le16 *)skb_push(skb, 2);
 995         *pktlen = cpu_to_le16(skb->len - 2);
 996
 997         skb_reset_network_header(skb);
 998
 999         if (dn_am_i_a_router(dn, dn_db, ifa)) {
1000                 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
1001                 if (skb2) {
1002                         dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
1003                 }
1004         }
1005
1006         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1007 }
1008
1009 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1010 {
1011         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1012
1013         if (dn_db->parms.forwarding == 0)
1014                 dn_send_endnode_hello(dev, ifa);
1015         else
1016                 dn_send_router_hello(dev, ifa);
1017 }
1018
1019 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1020 {
1021         int tdlen = 16;
1022         int size = dev->hard_header_len + 2 + 4 + tdlen;
1023         struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1024         int i;
1025         unsigned char *ptr;
1026         char src[ETH_ALEN];
1027
1028         if (skb == NULL)
1029                 return ;
1030
1031         skb->dev = dev;
1032         skb_push(skb, dev->hard_header_len);
1033         ptr = skb_put(skb, 2 + 4 + tdlen);
1034
1035         *ptr++ = DN_RT_PKT_HELO;
1036         *((__le16 *)ptr) = ifa->ifa_local;
1037         ptr += 2;
1038         *ptr++ = tdlen;
1039
1040         for(i = 0; i < tdlen; i++)
1041                 *ptr++ = 0252;
1042
1043         dn_dn2eth(src, ifa->ifa_local);
1044         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1045 }
1046
1047 static int dn_eth_up(struct net_device *dev)
1048 {
1049         struct dn_dev *dn_db = dev->dn_ptr;
1050
1051         if (dn_db->parms.forwarding == 0)
1052                 dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1053         else
1054                 dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1055
1056         dn_db->use_long = 1;
1057
1058         return 0;
1059 }
1060
1061 static void dn_eth_down(struct net_device *dev)
1062 {
1063         struct dn_dev *dn_db = dev->dn_ptr;
1064
1065         if (dn_db->parms.forwarding == 0)
1066                 dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1067         else
1068                 dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1069 }
1070
1071 static void dn_dev_set_timer(struct net_device *dev);
1072
1073 static void dn_dev_timer_func(unsigned long arg)
1074 {
1075         struct net_device *dev = (struct net_device *)arg;
1076         struct dn_dev *dn_db = dev->dn_ptr;
1077         struct dn_ifaddr *ifa;
1078
1079         if (dn_db->t3 <= dn_db->parms.t2) {
1080                 if (dn_db->parms.timer3) {
1081                         for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
1082                                 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1083                                         dn_db->parms.timer3(dev, ifa);
1084                         }
1085                 }
1086                 dn_db->t3 = dn_db->parms.t3;
1087         } else {
1088                 dn_db->t3 -= dn_db->parms.t2;
1089         }
1090
1091         dn_dev_set_timer(dev);
1092 }
1093
1094 static void dn_dev_set_timer(struct net_device *dev)
1095 {
1096         struct dn_dev *dn_db = dev->dn_ptr;
1097
1098         if (dn_db->parms.t2 > dn_db->parms.t3)
1099                 dn_db->parms.t2 = dn_db->parms.t3;
1100
1101         dn_db->timer.data = (unsigned long)dev;
1102         dn_db->timer.function = dn_dev_timer_func;
1103         dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1104
1105         add_timer(&dn_db->timer);
1106 }
1107
1108 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1109 {
1110         int i;
1111         struct dn_dev_parms *p = dn_dev_list;
1112         struct dn_dev *dn_db;
1113
1114         for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1115                 if (p->type == dev->type)
1116                         break;
1117         }
1118
1119         *err = -ENODEV;
1120         if (i == DN_DEV_LIST_SIZE)
1121                 return NULL;
1122
1123         *err = -ENOBUFS;
1124         if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1125                 return NULL;
1126
1127         memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1128         smp_wmb();
1129         dev->dn_ptr = dn_db;
1130         dn_db->dev = dev;
1131         init_timer(&dn_db->timer);
1132
1133         dn_db->uptime = jiffies;
1134
1135         dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1136         if (!dn_db->neigh_parms) {
1137                 dev->dn_ptr = NULL;
1138                 kfree(dn_db);
1139                 return NULL;
1140         }
1141
1142         if (dn_db->parms.up) {
1143                 if (dn_db->parms.up(dev) < 0) {
1144                         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1145                         dev->dn_ptr = NULL;
1146                         kfree(dn_db);
1147                         return NULL;
1148                 }
1149         }
1150
1151         dn_dev_sysctl_register(dev, &dn_db->parms);
1152
1153         dn_dev_set_timer(dev);
1154
1155         *err = 0;
1156         return dn_db;
1157 }
1158
1159
1160 /*
1161  * This processes a device up event. We only start up
1162  * the loopback device & ethernet devices with correct
1163  * MAC addreses automatically. Others must be started
1164  * specifically.
1165  *
1166  * FIXME: How should we configure the loopback address ? If we could dispense
1167  * with using decnet_address here and for autobind, it will be one less thing
1168  * for users to worry about setting up.
1169  */
1170
1171 void dn_dev_up(struct net_device *dev)
1172 {
1173         struct dn_ifaddr *ifa;
1174         __le16 addr = decnet_address;
1175         int maybe_default = 0;
1176         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1177
1178         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1179                 return;
1180
1181         /*
1182          * Need to ensure that loopback device has a dn_db attached to it
1183          * to allow creation of neighbours against it, even though it might
1184          * not have a local address of its own. Might as well do the same for
1185          * all autoconfigured interfaces.
1186          */
1187         if (dn_db == NULL) {
1188                 int err;
1189                 dn_db = dn_dev_create(dev, &err);
1190                 if (dn_db == NULL)
1191                         return;
1192         }
1193
1194         if (dev->type == ARPHRD_ETHER) {
1195                 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1196                         return;
1197                 addr = dn_eth2dn(dev->dev_addr);
1198                 maybe_default = 1;
1199         }
1200
1201         if (addr == 0)
1202                 return;
1203
1204         if ((ifa = dn_dev_alloc_ifa()) == NULL)
1205                 return;
1206
1207         ifa->ifa_local = ifa->ifa_address = addr;
1208         ifa->ifa_flags = 0;
1209         ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1210         strcpy(ifa->ifa_label, dev->name);
1211
1212         dn_dev_set_ifa(dev, ifa);
1213
1214         /*
1215          * Automagically set the default device to the first automatically
1216          * configured ethernet card in the system.
1217          */
1218         if (maybe_default) {
1219                 dev_hold(dev);
1220                 if (dn_dev_set_default(dev, 0))
1221                         dev_put(dev);
1222         }
1223 }
1224
1225 static void dn_dev_delete(struct net_device *dev)
1226 {
1227         struct dn_dev *dn_db = dev->dn_ptr;
1228
1229         if (dn_db == NULL)
1230                 return;
1231
1232         del_timer_sync(&dn_db->timer);
1233         dn_dev_sysctl_unregister(&dn_db->parms);
1234         dn_dev_check_default(dev);
1235         neigh_ifdown(&dn_neigh_table, dev);
1236
1237         if (dn_db->parms.down)
1238                 dn_db->parms.down(dev);
1239
1240         dev->dn_ptr = NULL;
1241
1242         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1243         neigh_ifdown(&dn_neigh_table, dev);
1244
1245         if (dn_db->router)
1246                 neigh_release(dn_db->router);
1247         if (dn_db->peer)
1248                 neigh_release(dn_db->peer);
1249
1250         kfree(dn_db);
1251 }
1252
1253 void dn_dev_down(struct net_device *dev)
1254 {
1255         struct dn_dev *dn_db = dev->dn_ptr;
1256         struct dn_ifaddr *ifa;
1257
1258         if (dn_db == NULL)
1259                 return;
1260
1261         while((ifa = dn_db->ifa_list) != NULL) {
1262                 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1263                 dn_dev_free_ifa(ifa);
1264         }
1265
1266         dn_dev_delete(dev);
1267 }
1268
1269 void dn_dev_init_pkt(struct sk_buff *skb)
1270 {
1271         return;
1272 }
1273
1274 void dn_dev_veri_pkt(struct sk_buff *skb)
1275 {
1276         return;
1277 }
1278
1279 void dn_dev_hello(struct sk_buff *skb)
1280 {
1281         return;
1282 }
1283
1284 void dn_dev_devices_off(void)
1285 {
1286         struct net_device *dev;
1287
1288         rtnl_lock();
1289         for_each_netdev(&init_net, dev)
1290                 dn_dev_down(dev);
1291         rtnl_unlock();
1292
1293 }
1294
1295 void dn_dev_devices_on(void)
1296 {
1297         struct net_device *dev;
1298
1299         rtnl_lock();
1300         for_each_netdev(&init_net, dev) {
1301                 if (dev->flags & IFF_UP)
1302                         dn_dev_up(dev);
1303         }
1304         rtnl_unlock();
1305 }
1306
1307 int register_dnaddr_notifier(struct notifier_block *nb)
1308 {
1309         return blocking_notifier_chain_register(&dnaddr_chain, nb);
1310 }
1311
1312 int unregister_dnaddr_notifier(struct notifier_block *nb)
1313 {
1314         return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1315 }
1316
1317 #ifdef CONFIG_PROC_FS
1318 static inline int is_dn_dev(struct net_device *dev)
1319 {
1320         return dev->dn_ptr != NULL;
1321 }
1322
1323 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1324         __acquires(&dev_base_lock)
1325 {
1326         int i;
1327         struct net_device *dev;
1328
1329         read_lock(&dev_base_lock);
1330
1331         if (*pos == 0)
1332                 return SEQ_START_TOKEN;
1333
1334         i = 1;
1335         for_each_netdev(&init_net, dev) {
1336                 if (!is_dn_dev(dev))
1337                         continue;
1338
1339                 if (i++ == *pos)
1340                         return dev;
1341         }
1342
1343         return NULL;
1344 }
1345
1346 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1347 {
1348         struct net_device *dev;
1349
1350         ++*pos;
1351
1352         dev = (struct net_device *)v;
1353         if (v == SEQ_START_TOKEN)
1354                 dev = net_device_entry(&init_net.dev_base_head);
1355
1356         for_each_netdev_continue(&init_net, dev) {
1357                 if (!is_dn_dev(dev))
1358                         continue;
1359
1360                 return dev;
1361         }
1362
1363         return NULL;
1364 }
1365
1366 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1367         __releases(&dev_base_lock)
1368 {
1369         read_unlock(&dev_base_lock);
1370 }
1371
1372 static char *dn_type2asc(char type)
1373 {
1374         switch(type) {
1375                 case DN_DEV_BCAST:
1376                         return "B";
1377                 case DN_DEV_UCAST:
1378                         return "U";
1379                 case DN_DEV_MPOINT:
1380                         return "M";
1381         }
1382
1383         return "?";
1384 }
1385
1386 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1387 {
1388         if (v == SEQ_START_TOKEN)
1389                 seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1390         else {
1391                 struct net_device *dev = v;
1392                 char peer_buf[DN_ASCBUF_LEN];
1393                 char router_buf[DN_ASCBUF_LEN];
1394                 struct dn_dev *dn_db = dev->dn_ptr;
1395
1396                 seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1397                                 "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1398                                 dev->name ? dev->name : "???",
1399                                 dn_type2asc(dn_db->parms.mode),
1400                                 0, 0,
1401                                 dn_db->t3, dn_db->parms.t3,
1402                                 mtu2blksize(dev),
1403                                 dn_db->parms.priority,
1404                                 dn_db->parms.state, dn_db->parms.name,
1405                                 dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1406                                 dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1407         }
1408         return 0;
1409 }
1410
1411 static const struct seq_operations dn_dev_seq_ops = {
1412         .start  = dn_dev_seq_start,
1413         .next   = dn_dev_seq_next,
1414         .stop   = dn_dev_seq_stop,
1415         .show   = dn_dev_seq_show,
1416 };
1417
1418 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1419 {
1420         return seq_open(file, &dn_dev_seq_ops);
1421 }
1422
1423 static const struct file_operations dn_dev_seq_fops = {
1424         .owner   = THIS_MODULE,
1425         .open    = dn_dev_seq_open,
1426         .read    = seq_read,
1427         .llseek  = seq_lseek,
1428         .release = seq_release,
1429 };
1430
1431 #endif /* CONFIG_PROC_FS */
1432
1433 static int addr[2];
1434 module_param_array(addr, int, NULL, 0444);
1435 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1436
1437 void __init dn_dev_init(void)
1438 {
1439         if (addr[0] > 63 || addr[0] < 0) {
1440                 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1441                 return;
1442         }
1443
1444         if (addr[1] > 1023 || addr[1] < 0) {
1445                 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1446                 return;
1447         }
1448
1449         decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1450
1451         dn_dev_devices_on();
1452
1453         rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL);
1454         rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL);
1455         rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr);
1456
1457         proc_net_fops_create(&init_net, "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 #ifdef CONFIG_SYSCTL
1471         {
1472                 int i;
1473                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1474                         dn_dev_sysctl_unregister(&dn_dev_list[i]);
1475         }
1476 #endif /* CONFIG_SYSCTL */
1477
1478         proc_net_remove(&init_net, "decnet_dev");
1479
1480         dn_dev_devices_off();
1481 }