SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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/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) ((int) ((char *) &((struct dn_dev_parms *)0)->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, struct file *,
 168                         void __user *, size_t *, loff_t *);
 169 static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
 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         ctl_table dn_dev_dev[2];
 177         ctl_table dn_dev_conf_dir[2];
 178         ctl_table dn_dev_proto_dir[2];
 179         ctl_table dn_dev_root_dir[2];
 180 } dn_dev_sysctl = {
 181         NULL,
 182         {
 183         {
 184                 .ctl_name = NET_DECNET_CONF_DEV_FORWARDING,
 185                 .procname = "forwarding",
 186                 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
 187                 .maxlen = sizeof(int),
 188                 .mode = 0644,
 189                 .proc_handler = dn_forwarding_proc,
 190                 .strategy = dn_forwarding_sysctl,
 191         },
 192         {
 193                 .ctl_name = NET_DECNET_CONF_DEV_PRIORITY,
 194                 .procname = "priority",
 195                 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
 196                 .maxlen = sizeof(int),
 197                 .mode = 0644,
 198                 .proc_handler = proc_dointvec_minmax,
 199                 .strategy = sysctl_intvec,
 200                 .extra1 = &min_priority,
 201                 .extra2 = &max_priority
 202         },
 203         {
 204                 .ctl_name = NET_DECNET_CONF_DEV_T2,
 205                 .procname = "t2",
 206                 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
 207                 .maxlen = sizeof(int),
 208                 .mode = 0644,
 209                 .proc_handler = proc_dointvec_minmax,
 210                 .strategy = sysctl_intvec,
 211                 .extra1 = &min_t2,
 212                 .extra2 = &max_t2
 213         },
 214         {
 215                 .ctl_name = NET_DECNET_CONF_DEV_T3,
 216                 .procname = "t3",
 217                 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
 218                 .maxlen = sizeof(int),
 219                 .mode = 0644,
 220                 .proc_handler = proc_dointvec_minmax,
 221                 .strategy = sysctl_intvec,
 222                 .extra1 = &min_t3,
 223                 .extra2 = &max_t3
 224         },
 225         {0}
 226         },
 227         {{
 228                 .ctl_name = 0,
 229                 .procname = "",
 230                 .mode = 0555,
 231                 .child = dn_dev_sysctl.dn_dev_vars
 232         }, {0}},
 233         {{
 234                 .ctl_name = NET_DECNET_CONF,
 235                 .procname = "conf",
 236                 .mode = 0555,
 237                 .child = dn_dev_sysctl.dn_dev_dev
 238         }, {0}},
 239         {{
 240                 .ctl_name = NET_DECNET,
 241                 .procname = "decnet",
 242                 .mode = 0555,
 243                 .child = dn_dev_sysctl.dn_dev_conf_dir
 244         }, {0}},
 245         {{
 246                 .ctl_name = CTL_NET,
 247                 .procname = "net",
 248                 .mode = 0555,
 249                 .child = dn_dev_sysctl.dn_dev_proto_dir
 250         }, {0}}
 251 };
 252
 253 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 254 {
 255         struct dn_dev_sysctl_table *t;
 256         int i;
 257
 258         t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
 259         if (t == NULL)
 260                 return;
 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         }
 266
 267         if (dev) {
 268                 t->dn_dev_dev[0].procname = dev->name;
 269                 t->dn_dev_dev[0].ctl_name = dev->ifindex;
 270         } else {
 271                 t->dn_dev_dev[0].procname = parms->name;
 272                 t->dn_dev_dev[0].ctl_name = parms->ctl_name;
 273         }
 274
 275         t->dn_dev_dev[0].child = t->dn_dev_vars;
 276         t->dn_dev_conf_dir[0].child = t->dn_dev_dev;
 277         t->dn_dev_proto_dir[0].child = t->dn_dev_conf_dir;
 278         t->dn_dev_root_dir[0].child = t->dn_dev_proto_dir;
 279         t->dn_dev_vars[0].extra1 = (void *)dev;
 280
 281         t->sysctl_header = register_sysctl_table(t->dn_dev_root_dir);
 282         if (t->sysctl_header == NULL)
 283                 kfree(t);
 284         else
 285                 parms->sysctl = t;
 286 }
 287
 288 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 289 {
 290         if (parms->sysctl) {
 291                 struct dn_dev_sysctl_table *t = parms->sysctl;
 292                 parms->sysctl = NULL;
 293                 unregister_sysctl_table(t->sysctl_header);
 294                 kfree(t);
 295         }
 296 }
 297
 298 static int dn_forwarding_proc(ctl_table *table, int write,
 299                                 struct file *filep,
 300                                 void __user *buffer,
 301                                 size_t *lenp, loff_t *ppos)
 302 {
 303 #ifdef CONFIG_DECNET_ROUTER
 304         struct net_device *dev = table->extra1;
 305         struct dn_dev *dn_db;
 306         int err;
 307         int tmp, old;
 308
 309         if (table->extra1 == NULL)
 310                 return -EINVAL;
 311
 312         dn_db = dev->dn_ptr;
 313         old = dn_db->parms.forwarding;
 314
 315         err = proc_dointvec(table, write, filep, buffer, lenp, ppos);
 316
 317         if ((err >= 0) && write) {
 318                 if (dn_db->parms.forwarding < 0)
 319                         dn_db->parms.forwarding = 0;
 320                 if (dn_db->parms.forwarding > 2)
 321                         dn_db->parms.forwarding = 2;
 322                 /*
 323                  * What an ugly hack this is... its works, just. It
 324                  * would be nice if sysctl/proc were just that little
 325                  * bit more flexible so I don't have to write a special
 326                  * routine, or suffer hacks like this - SJW
 327                  */
 328                 tmp = dn_db->parms.forwarding;
 329                 dn_db->parms.forwarding = old;
 330                 if (dn_db->parms.down)
 331                         dn_db->parms.down(dev);
 332                 dn_db->parms.forwarding = tmp;
 333                 if (dn_db->parms.up)
 334                         dn_db->parms.up(dev);
 335         }
 336
 337         return err;
 338 #else
 339         return -EINVAL;
 340 #endif
 341 }
 342
 343 static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
 344                         void __user *oldval, size_t __user *oldlenp,
 345                         void __user *newval, size_t newlen)
 346 {
 347 #ifdef CONFIG_DECNET_ROUTER
 348         struct net_device *dev = table->extra1;
 349         struct dn_dev *dn_db;
 350         int value;
 351
 352         if (table->extra1 == NULL)
 353                 return -EINVAL;
 354
 355         dn_db = dev->dn_ptr;
 356
 357         if (newval && newlen) {
 358                 if (newlen != sizeof(int))
 359                         return -EINVAL;
 360
 361                 if (get_user(value, (int __user *)newval))
 362                         return -EFAULT;
 363                 if (value < 0)
 364                         return -EINVAL;
 365                 if (value > 2)
 366                         return -EINVAL;
 367
 368                 if (dn_db->parms.down)
 369                         dn_db->parms.down(dev);
 370                 dn_db->parms.forwarding = value;
 371                 if (dn_db->parms.up)
 372                         dn_db->parms.up(dev);
 373         }
 374
 375         return 0;
 376 #else
 377         return -EINVAL;
 378 #endif
 379 }
 380
 381 #else /* CONFIG_SYSCTL */
 382 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 383 {
 384 }
 385 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 386 {
 387 }
 388
 389 #endif /* CONFIG_SYSCTL */
 390
 391 static inline __u16 mtu2blksize(struct net_device *dev)
 392 {
 393         u32 blksize = dev->mtu;
 394         if (blksize > 0xffff)
 395                 blksize = 0xffff;
 396
 397         if (dev->type == ARPHRD_ETHER ||
 398             dev->type == ARPHRD_PPP ||
 399             dev->type == ARPHRD_IPGRE ||
 400             dev->type == ARPHRD_LOOPBACK)
 401                 blksize -= 2;
 402
 403         return (__u16)blksize;
 404 }
 405
 406 static struct dn_ifaddr *dn_dev_alloc_ifa(void)
 407 {
 408         struct dn_ifaddr *ifa;
 409
 410         ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
 411
 412         return ifa;
 413 }
 414
 415 static __inline__ void dn_dev_free_ifa(struct dn_ifaddr *ifa)
 416 {
 417         kfree(ifa);
 418 }
 419
 420 static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr **ifap, int destroy)
 421 {
 422         struct dn_ifaddr *ifa1 = *ifap;
 423         unsigned char mac_addr[6];
 424         struct net_device *dev = dn_db->dev;
 425
 426         ASSERT_RTNL();
 427
 428         *ifap = ifa1->ifa_next;
 429
 430         if (dn_db->dev->type == ARPHRD_ETHER) {
 431                 if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
 432                         dn_dn2eth(mac_addr, ifa1->ifa_local);
 433                         dev_mc_delete(dev, mac_addr, ETH_ALEN, 0);
 434                 }
 435         }
 436
 437         dn_ifaddr_notify(RTM_DELADDR, ifa1);
 438         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
 439         if (destroy) {
 440                 dn_dev_free_ifa(ifa1);
 441
 442                 if (dn_db->ifa_list == NULL)
 443                         dn_dev_delete(dn_db->dev);
 444         }
 445 }
 446
 447 static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 448 {
 449         struct net_device *dev = dn_db->dev;
 450         struct dn_ifaddr *ifa1;
 451         unsigned char mac_addr[6];
 452
 453         ASSERT_RTNL();
 454
 455         /* Check for duplicates */
 456         for(ifa1 = dn_db->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
 457                 if (ifa1->ifa_local == ifa->ifa_local)
 458                         return -EEXIST;
 459         }
 460
 461         if (dev->type == ARPHRD_ETHER) {
 462                 if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
 463                         dn_dn2eth(mac_addr, ifa->ifa_local);
 464                         dev_mc_add(dev, mac_addr, ETH_ALEN, 0);
 465                 }
 466         }
 467
 468         ifa->ifa_next = dn_db->ifa_list;
 469         dn_db->ifa_list = ifa;
 470
 471         dn_ifaddr_notify(RTM_NEWADDR, ifa);
 472         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
 473
 474         return 0;
 475 }
 476
 477 static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
 478 {
 479         struct dn_dev *dn_db = dev->dn_ptr;
 480         int rv;
 481
 482         if (dn_db == NULL) {
 483                 int err;
 484                 dn_db = dn_dev_create(dev, &err);
 485                 if (dn_db == NULL)
 486                         return err;
 487         }
 488
 489         ifa->ifa_dev = dn_db;
 490
 491         if (dev->flags & IFF_LOOPBACK)
 492                 ifa->ifa_scope = RT_SCOPE_HOST;
 493
 494         rv = dn_dev_insert_ifa(dn_db, ifa);
 495         if (rv)
 496                 dn_dev_free_ifa(ifa);
 497         return rv;
 498 }
 499
 500
 501 int dn_dev_ioctl(unsigned int cmd, void __user *arg)
 502 {
 503         char buffer[DN_IFREQ_SIZE];
 504         struct ifreq *ifr = (struct ifreq *)buffer;
 505         struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
 506         struct dn_dev *dn_db;
 507         struct net_device *dev;
 508         struct dn_ifaddr *ifa = NULL, **ifap = NULL;
 509         int ret = 0;
 510
 511         if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
 512                 return -EFAULT;
 513         ifr->ifr_name[IFNAMSIZ-1] = 0;
 514
 515 #ifdef CONFIG_KMOD
 516         dev_load(&init_net, ifr->ifr_name);
 517 #endif
 518
 519         switch(cmd) {
 520                 case SIOCGIFADDR:
 521                         break;
 522                 case SIOCSIFADDR:
 523                         if (!capable(CAP_NET_ADMIN))
 524                                 return -EACCES;
 525                         if (sdn->sdn_family != AF_DECnet)
 526                                 return -EINVAL;
 527                         break;
 528                 default:
 529                         return -EINVAL;
 530         }
 531
 532         rtnl_lock();
 533
 534         if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
 535                 ret = -ENODEV;
 536                 goto done;
 537         }
 538
 539         if ((dn_db = dev->dn_ptr) != NULL) {
 540                 for (ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next)
 541                         if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
 542                                 break;
 543         }
 544
 545         if (ifa == NULL && cmd != SIOCSIFADDR) {
 546                 ret = -EADDRNOTAVAIL;
 547                 goto done;
 548         }
 549
 550         switch(cmd) {
 551                 case SIOCGIFADDR:
 552                         *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
 553                         goto rarok;
 554
 555                 case SIOCSIFADDR:
 556                         if (!ifa) {
 557                                 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
 558                                         ret = -ENOBUFS;
 559                                         break;
 560                                 }
 561                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 562                         } else {
 563                                 if (ifa->ifa_local == dn_saddr2dn(sdn))
 564                                         break;
 565                                 dn_dev_del_ifa(dn_db, ifap, 0);
 566                         }
 567
 568                         ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
 569
 570                         ret = dn_dev_set_ifa(dev, ifa);
 571         }
 572 done:
 573         rtnl_unlock();
 574
 575         return ret;
 576 rarok:
 577         if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
 578                 ret = -EFAULT;
 579         goto done;
 580 }
 581
 582 struct net_device *dn_dev_get_default(void)
 583 {
 584         struct net_device *dev;
 585         read_lock(&dndev_lock);
 586         dev = decnet_default_device;
 587         if (dev) {
 588                 if (dev->dn_ptr)
 589                         dev_hold(dev);
 590                 else
 591                         dev = NULL;
 592         }
 593         read_unlock(&dndev_lock);
 594         return dev;
 595 }
 596
 597 int dn_dev_set_default(struct net_device *dev, int force)
 598 {
 599         struct net_device *old = NULL;
 600         int rv = -EBUSY;
 601         if (!dev->dn_ptr)
 602                 return -ENODEV;
 603         write_lock(&dndev_lock);
 604         if (force || decnet_default_device == NULL) {
 605                 old = decnet_default_device;
 606                 decnet_default_device = dev;
 607                 rv = 0;
 608         }
 609         write_unlock(&dndev_lock);
 610         if (old)
 611                 dev_put(old);
 612         return rv;
 613 }
 614
 615 static void dn_dev_check_default(struct net_device *dev)
 616 {
 617         write_lock(&dndev_lock);
 618         if (dev == decnet_default_device) {
 619                 decnet_default_device = NULL;
 620         } else {
 621                 dev = NULL;
 622         }
 623         write_unlock(&dndev_lock);
 624         if (dev)
 625                 dev_put(dev);
 626 }
 627
 628 static struct dn_dev *dn_dev_by_index(int ifindex)
 629 {
 630         struct net_device *dev;
 631         struct dn_dev *dn_dev = NULL;
 632         dev = dev_get_by_index(&init_net, ifindex);
 633         if (dev) {
 634                 dn_dev = dev->dn_ptr;
 635                 dev_put(dev);
 636         }
 637
 638         return dn_dev;
 639 }
 640
 641 static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
 642         [IFA_ADDRESS]           = { .type = NLA_U16 },
 643         [IFA_LOCAL]             = { .type = NLA_U16 },
 644         [IFA_LABEL]             = { .type = NLA_STRING,
 645                                     .len = IFNAMSIZ - 1 },
 646 };
 647
 648 static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 649 {
 650         struct net *net = skb->sk->sk_net;
 651         struct nlattr *tb[IFA_MAX+1];
 652         struct dn_dev *dn_db;
 653         struct ifaddrmsg *ifm;
 654         struct dn_ifaddr *ifa, **ifap;
 655         int err = -EINVAL;
 656
 657         if (net != &init_net)
 658                 goto errout;
 659
 660         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
 661         if (err < 0)
 662                 goto errout;
 663
 664         err = -ENODEV;
 665         ifm = nlmsg_data(nlh);
 666         if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
 667                 goto errout;
 668
 669         err = -EADDRNOTAVAIL;
 670         for (ifap = &dn_db->ifa_list; (ifa = *ifap); ifap = &ifa->ifa_next) {
 671                 if (tb[IFA_LOCAL] &&
 672                     nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
 673                         continue;
 674
 675                 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
 676                         continue;
 677
 678                 dn_dev_del_ifa(dn_db, ifap, 1);
 679                 return 0;
 680         }
 681
 682 errout:
 683         return err;
 684 }
 685
 686 static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 687 {
 688         struct net *net = skb->sk->sk_net;
 689         struct nlattr *tb[IFA_MAX+1];
 690         struct net_device *dev;
 691         struct dn_dev *dn_db;
 692         struct ifaddrmsg *ifm;
 693         struct dn_ifaddr *ifa;
 694         int err;
 695
 696         if (net != &init_net)
 697                 return -EINVAL;
 698
 699         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
 700         if (err < 0)
 701                 return err;
 702
 703         if (tb[IFA_LOCAL] == NULL)
 704                 return -EINVAL;
 705
 706         ifm = nlmsg_data(nlh);
 707         if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
 708                 return -ENODEV;
 709
 710         if ((dn_db = dev->dn_ptr) == NULL) {
 711                 int err;
 712                 dn_db = dn_dev_create(dev, &err);
 713                 if (!dn_db)
 714                         return err;
 715         }
 716
 717         if ((ifa = dn_dev_alloc_ifa()) == NULL)
 718                 return -ENOBUFS;
 719
 720         if (tb[IFA_ADDRESS] == NULL)
 721                 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
 722
 723         ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
 724         ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
 725         ifa->ifa_flags = ifm->ifa_flags;
 726         ifa->ifa_scope = ifm->ifa_scope;
 727         ifa->ifa_dev = dn_db;
 728
 729         if (tb[IFA_LABEL])
 730                 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
 731         else
 732                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 733
 734         err = dn_dev_insert_ifa(dn_db, ifa);
 735         if (err)
 736                 dn_dev_free_ifa(ifa);
 737
 738         return err;
 739 }
 740
 741 static inline size_t dn_ifaddr_nlmsg_size(void)
 742 {
 743         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
 744                + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
 745                + nla_total_size(2) /* IFA_ADDRESS */
 746                + nla_total_size(2); /* IFA_LOCAL */
 747 }
 748
 749 static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
 750                              u32 pid, u32 seq, int event, unsigned int flags)
 751 {
 752         struct ifaddrmsg *ifm;
 753         struct nlmsghdr *nlh;
 754
 755         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
 756         if (nlh == NULL)
 757                 return -EMSGSIZE;
 758
 759         ifm = nlmsg_data(nlh);
 760         ifm->ifa_family = AF_DECnet;
 761         ifm->ifa_prefixlen = 16;
 762         ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
 763         ifm->ifa_scope = ifa->ifa_scope;
 764         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
 765
 766         if (ifa->ifa_address)
 767                 NLA_PUT_LE16(skb, IFA_ADDRESS, ifa->ifa_address);
 768         if (ifa->ifa_local)
 769                 NLA_PUT_LE16(skb, IFA_LOCAL, ifa->ifa_local);
 770         if (ifa->ifa_label[0])
 771                 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
 772
 773         return nlmsg_end(skb, nlh);
 774
 775 nla_put_failure:
 776         nlmsg_cancel(skb, nlh);
 777         return -EMSGSIZE;
 778 }
 779
 780 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
 781 {
 782         struct sk_buff *skb;
 783         int err = -ENOBUFS;
 784
 785         skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
 786         if (skb == NULL)
 787                 goto errout;
 788
 789         err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
 790         if (err < 0) {
 791                 /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
 792                 WARN_ON(err == -EMSGSIZE);
 793                 kfree_skb(skb);
 794                 goto errout;
 795         }
 796         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
 797 errout:
 798         if (err < 0)
 799                 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
 800 }
 801
 802 static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
 803 {
 804         struct net *net = skb->sk->sk_net;
 805         int idx, dn_idx = 0, skip_ndevs, skip_naddr;
 806         struct net_device *dev;
 807         struct dn_dev *dn_db;
 808         struct dn_ifaddr *ifa;
 809
 810         if (net != &init_net)
 811                 return 0;
 812
 813         skip_ndevs = cb->args[0];
 814         skip_naddr = cb->args[1];
 815
 816         idx = 0;
 817         for_each_netdev(&init_net, dev) {
 818                 if (idx < skip_ndevs)
 819                         goto cont;
 820                 else if (idx > skip_ndevs) {
 821                         /* Only skip over addresses for first dev dumped
 822                          * in this iteration (idx == skip_ndevs) */
 823                         skip_naddr = 0;
 824                 }
 825
 826                 if ((dn_db = dev->dn_ptr) == NULL)
 827                         goto cont;
 828
 829                 for (ifa = dn_db->ifa_list, dn_idx = 0; ifa;
 830                      ifa = ifa->ifa_next, dn_idx++) {
 831                         if (dn_idx < skip_naddr)
 832                                 continue;
 833
 834                         if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
 835                                               cb->nlh->nlmsg_seq, RTM_NEWADDR,
 836                                               NLM_F_MULTI) < 0)
 837                                 goto done;
 838                 }
 839 cont:
 840                 idx++;
 841         }
 842 done:
 843         cb->args[0] = idx;
 844         cb->args[1] = dn_idx;
 845
 846         return skb->len;
 847 }
 848
 849 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
 850 {
 851         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 852         struct dn_ifaddr *ifa;
 853         int rv = -ENODEV;
 854         if (dn_db == NULL)
 855                 goto out;
 856         ifa = dn_db->ifa_list;
 857         if (ifa != NULL) {
 858                 *addr = ifa->ifa_local;
 859                 rv = 0;
 860         }
 861 out:
 862         return rv;
 863 }
 864
 865 /*
 866  * Find a default address to bind to.
 867  *
 868  * This is one of those areas where the initial VMS concepts don't really
 869  * map onto the Linux concepts, and since we introduced multiple addresses
 870  * per interface we have to cope with slightly odd ways of finding out what
 871  * "our address" really is. Mostly it's not a problem; for this we just guess
 872  * a sensible default. Eventually the routing code will take care of all the
 873  * nasties for us I hope.
 874  */
 875 int dn_dev_bind_default(__le16 *addr)
 876 {
 877         struct net_device *dev;
 878         int rv;
 879         dev = dn_dev_get_default();
 880 last_chance:
 881         if (dev) {
 882                 read_lock(&dev_base_lock);
 883                 rv = dn_dev_get_first(dev, addr);
 884                 read_unlock(&dev_base_lock);
 885                 dev_put(dev);
 886                 if (rv == 0 || dev == init_net.loopback_dev)
 887                         return rv;
 888         }
 889         dev = init_net.loopback_dev;
 890         dev_hold(dev);
 891         goto last_chance;
 892 }
 893
 894 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 895 {
 896         struct endnode_hello_message *msg;
 897         struct sk_buff *skb = NULL;
 898         __le16 *pktlen;
 899         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 900
 901         if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
 902                 return;
 903
 904         skb->dev = dev;
 905
 906         msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
 907
 908         msg->msgflg  = 0x0D;
 909         memcpy(msg->tiver, dn_eco_version, 3);
 910         dn_dn2eth(msg->id, ifa->ifa_local);
 911         msg->iinfo   = DN_RT_INFO_ENDN;
 912         msg->blksize = dn_htons(mtu2blksize(dev));
 913         msg->area    = 0x00;
 914         memset(msg->seed, 0, 8);
 915         memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
 916
 917         if (dn_db->router) {
 918                 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 919                 dn_dn2eth(msg->neighbor, dn->addr);
 920         }
 921
 922         msg->timer   = dn_htons((unsigned short)dn_db->parms.t3);
 923         msg->mpd     = 0x00;
 924         msg->datalen = 0x02;
 925         memset(msg->data, 0xAA, 2);
 926
 927         pktlen = (__le16 *)skb_push(skb,2);
 928         *pktlen = dn_htons(skb->len - 2);
 929
 930         skb_reset_network_header(skb);
 931
 932         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
 933 }
 934
 935
 936 #define DRDELAY (5 * HZ)
 937
 938 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 939 {
 940         /* First check time since device went up */
 941         if ((jiffies - dn_db->uptime) < DRDELAY)
 942                 return 0;
 943
 944         /* If there is no router, then yes... */
 945         if (!dn_db->router)
 946                 return 1;
 947
 948         /* otherwise only if we have a higher priority or.. */
 949         if (dn->priority < dn_db->parms.priority)
 950                 return 1;
 951
 952         /* if we have equal priority and a higher node number */
 953         if (dn->priority != dn_db->parms.priority)
 954                 return 0;
 955
 956         if (dn_ntohs(dn->addr) < dn_ntohs(ifa->ifa_local))
 957                 return 1;
 958
 959         return 0;
 960 }
 961
 962 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 963 {
 964         int n;
 965         struct dn_dev *dn_db = dev->dn_ptr;
 966         struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 967         struct sk_buff *skb;
 968         size_t size;
 969         unsigned char *ptr;
 970         unsigned char *i1, *i2;
 971         __le16 *pktlen;
 972         char *src;
 973
 974         if (mtu2blksize(dev) < (26 + 7))
 975                 return;
 976
 977         n = mtu2blksize(dev) - 26;
 978         n /= 7;
 979
 980         if (n > 32)
 981                 n = 32;
 982
 983         size = 2 + 26 + 7 * n;
 984
 985         if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
 986                 return;
 987
 988         skb->dev = dev;
 989         ptr = skb_put(skb, size);
 990
 991         *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
 992         *ptr++ = 2; /* ECO */
 993         *ptr++ = 0;
 994         *ptr++ = 0;
 995         dn_dn2eth(ptr, ifa->ifa_local);
 996         src = ptr;
 997         ptr += ETH_ALEN;
 998         *ptr++ = dn_db->parms.forwarding == 1 ?
 999                         DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
1000         *((__le16 *)ptr) = dn_htons(mtu2blksize(dev));
1001         ptr += 2;
1002         *ptr++ = dn_db->parms.priority; /* Priority */
1003         *ptr++ = 0; /* Area: Reserved */
1004         *((__le16 *)ptr) = dn_htons((unsigned short)dn_db->parms.t3);
1005         ptr += 2;
1006         *ptr++ = 0; /* MPD: Reserved */
1007         i1 = ptr++;
1008         memset(ptr, 0, 7); /* Name: Reserved */
1009         ptr += 7;
1010         i2 = ptr++;
1011
1012         n = dn_neigh_elist(dev, ptr, n);
1013
1014         *i2 = 7 * n;
1015         *i1 = 8 + *i2;
1016
1017         skb_trim(skb, (27 + *i2));
1018
1019         pktlen = (__le16 *)skb_push(skb, 2);
1020         *pktlen = dn_htons(skb->len - 2);
1021
1022         skb_reset_network_header(skb);
1023
1024         if (dn_am_i_a_router(dn, dn_db, ifa)) {
1025                 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
1026                 if (skb2) {
1027                         dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
1028                 }
1029         }
1030
1031         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1032 }
1033
1034 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1035 {
1036         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1037
1038         if (dn_db->parms.forwarding == 0)
1039                 dn_send_endnode_hello(dev, ifa);
1040         else
1041                 dn_send_router_hello(dev, ifa);
1042 }
1043
1044 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1045 {
1046         int tdlen = 16;
1047         int size = dev->hard_header_len + 2 + 4 + tdlen;
1048         struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1049         int i;
1050         unsigned char *ptr;
1051         char src[ETH_ALEN];
1052
1053         if (skb == NULL)
1054                 return ;
1055
1056         skb->dev = dev;
1057         skb_push(skb, dev->hard_header_len);
1058         ptr = skb_put(skb, 2 + 4 + tdlen);
1059
1060         *ptr++ = DN_RT_PKT_HELO;
1061         *((__le16 *)ptr) = ifa->ifa_local;
1062         ptr += 2;
1063         *ptr++ = tdlen;
1064
1065         for(i = 0; i < tdlen; i++)
1066                 *ptr++ = 0252;
1067
1068         dn_dn2eth(src, ifa->ifa_local);
1069         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1070 }
1071
1072 static int dn_eth_up(struct net_device *dev)
1073 {
1074         struct dn_dev *dn_db = dev->dn_ptr;
1075
1076         if (dn_db->parms.forwarding == 0)
1077                 dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1078         else
1079                 dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1080
1081         dn_db->use_long = 1;
1082
1083         return 0;
1084 }
1085
1086 static void dn_eth_down(struct net_device *dev)
1087 {
1088         struct dn_dev *dn_db = dev->dn_ptr;
1089
1090         if (dn_db->parms.forwarding == 0)
1091                 dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1092         else
1093                 dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1094 }
1095
1096 static void dn_dev_set_timer(struct net_device *dev);
1097
1098 static void dn_dev_timer_func(unsigned long arg)
1099 {
1100         struct net_device *dev = (struct net_device *)arg;
1101         struct dn_dev *dn_db = dev->dn_ptr;
1102         struct dn_ifaddr *ifa;
1103
1104         if (dn_db->t3 <= dn_db->parms.t2) {
1105                 if (dn_db->parms.timer3) {
1106                         for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
1107                                 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1108                                         dn_db->parms.timer3(dev, ifa);
1109                         }
1110                 }
1111                 dn_db->t3 = dn_db->parms.t3;
1112         } else {
1113                 dn_db->t3 -= dn_db->parms.t2;
1114         }
1115
1116         dn_dev_set_timer(dev);
1117 }
1118
1119 static void dn_dev_set_timer(struct net_device *dev)
1120 {
1121         struct dn_dev *dn_db = dev->dn_ptr;
1122
1123         if (dn_db->parms.t2 > dn_db->parms.t3)
1124                 dn_db->parms.t2 = dn_db->parms.t3;
1125
1126         dn_db->timer.data = (unsigned long)dev;
1127         dn_db->timer.function = dn_dev_timer_func;
1128         dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1129
1130         add_timer(&dn_db->timer);
1131 }
1132
1133 struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1134 {
1135         int i;
1136         struct dn_dev_parms *p = dn_dev_list;
1137         struct dn_dev *dn_db;
1138
1139         for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1140                 if (p->type == dev->type)
1141                         break;
1142         }
1143
1144         *err = -ENODEV;
1145         if (i == DN_DEV_LIST_SIZE)
1146                 return NULL;
1147
1148         *err = -ENOBUFS;
1149         if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1150                 return NULL;
1151
1152         memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1153         smp_wmb();
1154         dev->dn_ptr = dn_db;
1155         dn_db->dev = dev;
1156         init_timer(&dn_db->timer);
1157
1158         dn_db->uptime = jiffies;
1159
1160         dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1161         if (!dn_db->neigh_parms) {
1162                 dev->dn_ptr = NULL;
1163                 kfree(dn_db);
1164                 return NULL;
1165         }
1166
1167         if (dn_db->parms.up) {
1168                 if (dn_db->parms.up(dev) < 0) {
1169                         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1170                         dev->dn_ptr = NULL;
1171                         kfree(dn_db);
1172                         return NULL;
1173                 }
1174         }
1175
1176         dn_dev_sysctl_register(dev, &dn_db->parms);
1177
1178         dn_dev_set_timer(dev);
1179
1180         *err = 0;
1181         return dn_db;
1182 }
1183
1184
1185 /*
1186  * This processes a device up event. We only start up
1187  * the loopback device & ethernet devices with correct
1188  * MAC addreses automatically. Others must be started
1189  * specifically.
1190  *
1191  * FIXME: How should we configure the loopback address ? If we could dispense
1192  * with using decnet_address here and for autobind, it will be one less thing
1193  * for users to worry about setting up.
1194  */
1195
1196 void dn_dev_up(struct net_device *dev)
1197 {
1198         struct dn_ifaddr *ifa;
1199         __le16 addr = decnet_address;
1200         int maybe_default = 0;
1201         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1202
1203         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1204                 return;
1205
1206         /*
1207          * Need to ensure that loopback device has a dn_db attached to it
1208          * to allow creation of neighbours against it, even though it might
1209          * not have a local address of its own. Might as well do the same for
1210          * all autoconfigured interfaces.
1211          */
1212         if (dn_db == NULL) {
1213                 int err;
1214                 dn_db = dn_dev_create(dev, &err);
1215                 if (dn_db == NULL)
1216                         return;
1217         }
1218
1219         if (dev->type == ARPHRD_ETHER) {
1220                 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1221                         return;
1222                 addr = dn_eth2dn(dev->dev_addr);
1223                 maybe_default = 1;
1224         }
1225
1226         if (addr == 0)
1227                 return;
1228
1229         if ((ifa = dn_dev_alloc_ifa()) == NULL)
1230                 return;
1231
1232         ifa->ifa_local = ifa->ifa_address = addr;
1233         ifa->ifa_flags = 0;
1234         ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1235         strcpy(ifa->ifa_label, dev->name);
1236
1237         dn_dev_set_ifa(dev, ifa);
1238
1239         /*
1240          * Automagically set the default device to the first automatically
1241          * configured ethernet card in the system.
1242          */
1243         if (maybe_default) {
1244                 dev_hold(dev);
1245                 if (dn_dev_set_default(dev, 0))
1246                         dev_put(dev);
1247         }
1248 }
1249
1250 static void dn_dev_delete(struct net_device *dev)
1251 {
1252         struct dn_dev *dn_db = dev->dn_ptr;
1253
1254         if (dn_db == NULL)
1255                 return;
1256
1257         del_timer_sync(&dn_db->timer);
1258         dn_dev_sysctl_unregister(&dn_db->parms);
1259         dn_dev_check_default(dev);
1260         neigh_ifdown(&dn_neigh_table, dev);
1261
1262         if (dn_db->parms.down)
1263                 dn_db->parms.down(dev);
1264
1265         dev->dn_ptr = NULL;
1266
1267         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1268         neigh_ifdown(&dn_neigh_table, dev);
1269
1270         if (dn_db->router)
1271                 neigh_release(dn_db->router);
1272         if (dn_db->peer)
1273                 neigh_release(dn_db->peer);
1274
1275         kfree(dn_db);
1276 }
1277
1278 void dn_dev_down(struct net_device *dev)
1279 {
1280         struct dn_dev *dn_db = dev->dn_ptr;
1281         struct dn_ifaddr *ifa;
1282
1283         if (dn_db == NULL)
1284                 return;
1285
1286         while((ifa = dn_db->ifa_list) != NULL) {
1287                 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1288                 dn_dev_free_ifa(ifa);
1289         }
1290
1291         dn_dev_delete(dev);
1292 }
1293
1294 void dn_dev_init_pkt(struct sk_buff *skb)
1295 {
1296         return;
1297 }
1298
1299 void dn_dev_veri_pkt(struct sk_buff *skb)
1300 {
1301         return;
1302 }
1303
1304 void dn_dev_hello(struct sk_buff *skb)
1305 {
1306         return;
1307 }
1308
1309 void dn_dev_devices_off(void)
1310 {
1311         struct net_device *dev;
1312
1313         rtnl_lock();
1314         for_each_netdev(&init_net, dev)
1315                 dn_dev_down(dev);
1316         rtnl_unlock();
1317
1318 }
1319
1320 void dn_dev_devices_on(void)
1321 {
1322         struct net_device *dev;
1323
1324         rtnl_lock();
1325         for_each_netdev(&init_net, dev) {
1326                 if (dev->flags & IFF_UP)
1327                         dn_dev_up(dev);
1328         }
1329         rtnl_unlock();
1330 }
1331
1332 int register_dnaddr_notifier(struct notifier_block *nb)
1333 {
1334         return blocking_notifier_chain_register(&dnaddr_chain, nb);
1335 }
1336
1337 int unregister_dnaddr_notifier(struct notifier_block *nb)
1338 {
1339         return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1340 }
1341
1342 #ifdef CONFIG_PROC_FS
1343 static inline int is_dn_dev(struct net_device *dev)
1344 {
1345         return dev->dn_ptr != NULL;
1346 }
1347
1348 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1349 {
1350         int i;
1351         struct net_device *dev;
1352
1353         read_lock(&dev_base_lock);
1354
1355         if (*pos == 0)
1356                 return SEQ_START_TOKEN;
1357
1358         i = 1;
1359         for_each_netdev(&init_net, dev) {
1360                 if (!is_dn_dev(dev))
1361                         continue;
1362
1363                 if (i++ == *pos)
1364                         return dev;
1365         }
1366
1367         return NULL;
1368 }
1369
1370 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1371 {
1372         struct net_device *dev;
1373
1374         ++*pos;
1375
1376         dev = (struct net_device *)v;
1377         if (v == SEQ_START_TOKEN)
1378                 dev = net_device_entry(&init_net.dev_base_head);
1379
1380         for_each_netdev_continue(&init_net, dev) {
1381                 if (!is_dn_dev(dev))
1382                         continue;
1383
1384                 return dev;
1385         }
1386
1387         return NULL;
1388 }
1389
1390 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1391 {
1392         read_unlock(&dev_base_lock);
1393 }
1394
1395 static char *dn_type2asc(char type)
1396 {
1397         switch(type) {
1398                 case DN_DEV_BCAST:
1399                         return "B";
1400                 case DN_DEV_UCAST:
1401                         return "U";
1402                 case DN_DEV_MPOINT:
1403                         return "M";
1404         }
1405
1406         return "?";
1407 }
1408
1409 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1410 {
1411         if (v == SEQ_START_TOKEN)
1412                 seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1413         else {
1414                 struct net_device *dev = v;
1415                 char peer_buf[DN_ASCBUF_LEN];
1416                 char router_buf[DN_ASCBUF_LEN];
1417                 struct dn_dev *dn_db = dev->dn_ptr;
1418
1419                 seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1420                                 "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1421                                 dev->name ? dev->name : "???",
1422                                 dn_type2asc(dn_db->parms.mode),
1423                                 0, 0,
1424                                 dn_db->t3, dn_db->parms.t3,
1425                                 mtu2blksize(dev),
1426                                 dn_db->parms.priority,
1427                                 dn_db->parms.state, dn_db->parms.name,
1428                                 dn_db->router ? dn_addr2asc(dn_ntohs(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1429                                 dn_db->peer ? dn_addr2asc(dn_ntohs(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1430         }
1431         return 0;
1432 }
1433
1434 static const struct seq_operations dn_dev_seq_ops = {
1435         .start  = dn_dev_seq_start,
1436         .next   = dn_dev_seq_next,
1437         .stop   = dn_dev_seq_stop,
1438         .show   = dn_dev_seq_show,
1439 };
1440
1441 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1442 {
1443         return seq_open(file, &dn_dev_seq_ops);
1444 }
1445
1446 static const struct file_operations dn_dev_seq_fops = {
1447         .owner   = THIS_MODULE,
1448         .open    = dn_dev_seq_open,
1449         .read    = seq_read,
1450         .llseek  = seq_lseek,
1451         .release = seq_release,
1452 };
1453
1454 #endif /* CONFIG_PROC_FS */
1455
1456 static int addr[2];
1457 module_param_array(addr, int, NULL, 0444);
1458 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1459
1460 void __init dn_dev_init(void)
1461 {
1462         if (addr[0] > 63 || addr[0] < 0) {
1463                 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1464                 return;
1465         }
1466
1467         if (addr[1] > 1023 || addr[1] < 0) {
1468                 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1469                 return;
1470         }
1471
1472         decnet_address = dn_htons((addr[0] << 10) | addr[1]);
1473
1474         dn_dev_devices_on();
1475
1476         rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL);
1477         rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL);
1478         rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr);
1479
1480         proc_net_fops_create(&init_net, "decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1481
1482 #ifdef CONFIG_SYSCTL
1483         {
1484                 int i;
1485                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1486                         dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1487         }
1488 #endif /* CONFIG_SYSCTL */
1489 }
1490
1491 void __exit dn_dev_cleanup(void)
1492 {
1493 #ifdef CONFIG_SYSCTL
1494         {
1495                 int i;
1496                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1497                         dn_dev_sysctl_unregister(&dn_dev_list[i]);
1498         }
1499 #endif /* CONFIG_SYSCTL */
1500
1501         proc_net_remove(&init_net, "decnet_dev");
1502
1503         dn_dev_devices_off();
1504 }