net/decnet/dn_dev.c

   1 /*
   2  * DECnet       An implementation of the DECnet protocol suite for the LINUX
   3  *              operating system.  DECnet is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              DECnet Device Layer
   7  *
   8  * Authors:     Steve Whitehouse <SteveW@ACM.org>
   9  *              Eduardo Marcelo Serrat <emserrat@geocities.com>
  10  *
  11  * Changes:
  12  *          Steve Whitehouse : Devices now see incoming frames so they
  13  *                             can mark on who it came from.
  14  *          Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour
  15  *                             can now have a device specific setup func.
  16  *          Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/
  17  *          Steve Whitehouse : Fixed bug which sometimes killed timer
  18  *          Steve Whitehouse : Multiple ifaddr support
  19  *          Steve Whitehouse : SIOCGIFCONF is now a compile time option
  20  *          Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding
  21  *          Steve Whitehouse : Removed timer1 - it's a user space issue now
  22  *         Patrick Caulfield : Fixed router hello message format
  23  *          Steve Whitehouse : Got rid of constant sizes for blksize for
  24  *                             devices. All mtu based now.
  25  */
  26
  27 #include <linux/config.h>
  28 #include <linux/module.h>
  29 #include <linux/moduleparam.h>
  30 #include <linux/init.h>
  31 #include <linux/net.h>
  32 #include <linux/netdevice.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/timer.h>
  36 #include <linux/string.h>
  37 #include <linux/if_arp.h>
  38 #include <linux/if_ether.h>
  39 #include <linux/skbuff.h>
  40 #include <linux/rtnetlink.h>
  41 #include <linux/sysctl.h>
  42 #include <linux/notifier.h>
  43 #include <asm/uaccess.h>
  44 #include <net/neighbour.h>
  45 #include <net/dst.h>
  46 #include <net/flow.h>
  47 #include <net/dn.h>
  48 #include <net/dn_dev.h>
  49 #include <net/dn_route.h>
  50 #include <net/dn_neigh.h>
  51 #include <net/dn_fib.h>
  52
  53 #define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
  54
  55 static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
  56 static char dn_rt_all_rt_mcast[ETH_ALEN]  = {0xAB,0x00,0x00,0x03,0x00,0x00};
  57 static char dn_hiord[ETH_ALEN]            = {0xAA,0x00,0x04,0x00,0x00,0x00};
  58 static unsigned char dn_eco_version[3]    = {0x02,0x00,0x00};
  59
  60 extern struct neigh_table dn_neigh_table;
  61
  62 /*
  63  * decnet_address is kept in network order.
  64  */
  65 dn_address decnet_address = 0;
  66
  67 static rwlock_t dndev_lock = RW_LOCK_UNLOCKED;
  68 static struct net_device *decnet_default_device;
  69 static struct notifier_block *dnaddr_chain;
  70
  71 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
  72 static void dn_dev_delete(struct net_device *dev);
  73 static void rtmsg_ifa(int event, struct dn_ifaddr *ifa);
  74
  75 static int dn_eth_up(struct net_device *);
  76 static void dn_eth_down(struct net_device *);
  77 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  78 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  79
  80 static struct dn_dev_parms dn_dev_list[] =  {
  81 {
  82         .type =         ARPHRD_ETHER, /* Ethernet */
  83         .mode =         DN_DEV_BCAST,
  84         .state =        DN_DEV_S_RU,
  85         .t2 =           1,
  86         .t3 =           10,
  87         .name =         "ethernet",
  88         .ctl_name =     NET_DECNET_CONF_ETHER,
  89         .up =           dn_eth_up,
  90         .down =         dn_eth_down,
  91         .timer3 =       dn_send_brd_hello,
  92 },
  93 {
  94         .type =         ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
  95         .mode =         DN_DEV_BCAST,
  96         .state =        DN_DEV_S_RU,
  97         .t2 =           1,
  98         .t3 =           10,
  99         .name =         "ipgre",
 100         .ctl_name =     NET_DECNET_CONF_GRE,
 101         .timer3 =       dn_send_brd_hello,
 102 },
 103 #if 0
 104 {
 105         .type =         ARPHRD_X25, /* Bog standard X.25 */
 106         .mode =         DN_DEV_UCAST,
 107         .state =        DN_DEV_S_DS,
 108         .t2 =           1,
 109         .t3 =           120,
 110         .name =         "x25",
 111         .ctl_name =     NET_DECNET_CONF_X25,
 112         .timer3 =       dn_send_ptp_hello,
 113 },
 114 #endif
 115 #if 0
 116 {
 117         .type =         ARPHRD_PPP, /* DECnet over PPP */
 118         .mode =         DN_DEV_BCAST,
 119         .state =        DN_DEV_S_RU,
 120         .t2 =           1,
 121         .t3 =           10,
 122         .name =         "ppp",
 123         .ctl_name =     NET_DECNET_CONF_PPP,
 124         .timer3 =       dn_send_brd_hello,
 125 },
 126 #endif
 127 {
 128         .type =         ARPHRD_DDCMP, /* DECnet over DDCMP */
 129         .mode =         DN_DEV_UCAST,
 130         .state =        DN_DEV_S_DS,
 131         .t2 =           1,
 132         .t3 =           120,
 133         .name =         "ddcmp",
 134         .ctl_name =     NET_DECNET_CONF_DDCMP,
 135         .timer3 =       dn_send_ptp_hello,
 136 },
 137 {
 138         .type =         ARPHRD_LOOPBACK, /* Loopback interface - always last */
 139         .mode =         DN_DEV_BCAST,
 140         .state =        DN_DEV_S_RU,
 141         .t2 =           1,
 142         .t3 =           10,
 143         .name =         "loopback",
 144         .ctl_name =     NET_DECNET_CONF_LOOPBACK,
 145         .timer3 =       dn_send_brd_hello,
 146 }
 147 };
 148
 149 #define DN_DEV_LIST_SIZE (sizeof(dn_dev_list)/sizeof(struct dn_dev_parms))
 150
 151 #define DN_DEV_PARMS_OFFSET(x) ((int) ((char *) &((struct dn_dev_parms *)0)->x))
 152
 153 #ifdef CONFIG_SYSCTL
 154
 155 static int min_t2[] = { 1 };
 156 static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
 157 static int min_t3[] = { 1 };
 158 static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
 159
 160 static int min_priority[1];
 161 static int max_priority[] = { 127 }; /* From DECnet spec */
 162
 163 static int dn_forwarding_proc(ctl_table *, int, struct file *,
 164                         void __user *, size_t *);
 165 static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
 166                         void __user *oldval, size_t __user *oldlenp,
 167                         void __user *newval, size_t newlen,
 168                         void **context);
 169
 170 static struct dn_dev_sysctl_table {
 171         struct ctl_table_header *sysctl_header;
 172         ctl_table dn_dev_vars[5];
 173         ctl_table dn_dev_dev[2];
 174         ctl_table dn_dev_conf_dir[2];
 175         ctl_table dn_dev_proto_dir[2];
 176         ctl_table dn_dev_root_dir[2];
 177 } dn_dev_sysctl = {
 178         NULL,
 179         {
 180         {
 181                 .ctl_name = NET_DECNET_CONF_DEV_FORWARDING,
 182                 .procname = "forwarding",
 183                 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
 184                 .maxlen = sizeof(int),
 185                 .mode = 0644,
 186                 .proc_handler = dn_forwarding_proc,
 187                 .strategy = dn_forwarding_sysctl,
 188         },
 189         {
 190                 .ctl_name = NET_DECNET_CONF_DEV_PRIORITY,
 191                 .procname = "priority",
 192                 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
 193                 .maxlen = sizeof(int),
 194                 .mode = 0644,
 195                 .proc_handler = proc_dointvec_minmax,
 196                 .strategy = sysctl_intvec,
 197                 .extra1 = &min_priority,
 198                 .extra2 = &max_priority
 199         },
 200         {
 201                 .ctl_name = NET_DECNET_CONF_DEV_T2,
 202                 .procname = "t2",
 203                 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
 204                 .maxlen = sizeof(int),
 205                 .mode = 0644,
 206                 .proc_handler = proc_dointvec_minmax,
 207                 .strategy = sysctl_intvec,
 208                 .extra1 = &min_t2,
 209                 .extra2 = &max_t2
 210         },
 211         {
 212                 .ctl_name = NET_DECNET_CONF_DEV_T3,
 213                 .procname = "t3",
 214                 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
 215                 .maxlen = sizeof(int),
 216                 .mode = 0644,
 217                 .proc_handler = proc_dointvec_minmax,
 218                 .strategy = sysctl_intvec,
 219                 .extra1 = &min_t3,
 220                 .extra2 = &max_t3
 221         },
 222         {0}
 223         },
 224         {{
 225                 .ctl_name = 0,
 226                 .procname = "",
 227                 .mode = 0555,
 228                 .child = dn_dev_sysctl.dn_dev_vars
 229         }, {0}},
 230         {{
 231                 .ctl_name = NET_DECNET_CONF,
 232                 .procname = "conf",
 233                 .mode = 0555,
 234                 .child = dn_dev_sysctl.dn_dev_dev
 235         }, {0}},
 236         {{
 237                 .ctl_name = NET_DECNET,
 238                 .procname = "decnet",
 239                 .mode = 0555,
 240                 .child = dn_dev_sysctl.dn_dev_conf_dir
 241         }, {0}},
 242         {{
 243                 .ctl_name = CTL_NET,
 244                 .procname = "net",
 245                 .mode = 0555,
 246                 .child = dn_dev_sysctl.dn_dev_proto_dir
 247         }, {0}}
 248 };
 249
 250 static inline __u16 mtu2blksize(struct net_device *dev)
 251 {
 252         u32 blksize = dev->mtu;
 253         if (blksize > 0xffff)
 254                 blksize = 0xffff;
 255
 256         if (dev->type == ARPHRD_ETHER ||
 257             dev->type == ARPHRD_PPP ||
 258             dev->type == ARPHRD_IPGRE ||
 259             dev->type == ARPHRD_LOOPBACK)
 260                 blksize -= 2;
 261
 262         return (__u16)blksize;
 263 }
 264
 265 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 266 {
 267         struct dn_dev_sysctl_table *t;
 268         int i;
 269
 270         t = kmalloc(sizeof(*t), GFP_KERNEL);
 271         if (t == NULL)
 272                 return;
 273
 274         memcpy(t, &dn_dev_sysctl, sizeof(*t));
 275
 276         for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
 277                 long offset = (long)t->dn_dev_vars[i].data;
 278                 t->dn_dev_vars[i].data = ((char *)parms) + offset;
 279                 t->dn_dev_vars[i].de = NULL;
 280         }
 281
 282         if (dev) {
 283                 t->dn_dev_dev[0].procname = dev->name;
 284                 t->dn_dev_dev[0].ctl_name = dev->ifindex;
 285         } else {
 286                 t->dn_dev_dev[0].procname = parms->name;
 287                 t->dn_dev_dev[0].ctl_name = parms->ctl_name;
 288         }
 289
 290         t->dn_dev_dev[0].child = t->dn_dev_vars;
 291         t->dn_dev_dev[0].de = NULL;
 292         t->dn_dev_conf_dir[0].child = t->dn_dev_dev;
 293         t->dn_dev_conf_dir[0].de = NULL;
 294         t->dn_dev_proto_dir[0].child = t->dn_dev_conf_dir;
 295         t->dn_dev_proto_dir[0].de = NULL;
 296         t->dn_dev_root_dir[0].child = t->dn_dev_proto_dir;
 297         t->dn_dev_root_dir[0].de = NULL;
 298         t->dn_dev_vars[0].extra1 = (void *)dev;
 299
 300         t->sysctl_header = register_sysctl_table(t->dn_dev_root_dir, 0);
 301         if (t->sysctl_header == NULL)
 302                 kfree(t);
 303         else
 304                 parms->sysctl = t;
 305 }
 306
 307 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 308 {
 309         if (parms->sysctl) {
 310                 struct dn_dev_sysctl_table *t = parms->sysctl;
 311                 parms->sysctl = NULL;
 312                 unregister_sysctl_table(t->sysctl_header);
 313                 kfree(t);
 314         }
 315 }
 316
 317 struct net_device *dn_dev_get_default(void)
 318 {
 319         struct net_device *dev;
 320         read_lock(&dndev_lock);
 321         dev = decnet_default_device;
 322         if (dev) {
 323                 if (dev->dn_ptr)
 324                         dev_hold(dev);
 325                 else
 326                         dev = NULL;
 327         }
 328         read_unlock(&dndev_lock);
 329         return dev;
 330 }
 331
 332 int dn_dev_set_default(struct net_device *dev, int force)
 333 {
 334         struct net_device *old = NULL;
 335         int rv = -EBUSY;
 336         if (!dev->dn_ptr)
 337                 return -ENODEV;
 338         write_lock(&dndev_lock);
 339         if (force || decnet_default_device == NULL) {
 340                 old = decnet_default_device;
 341                 decnet_default_device = dev;
 342                 rv = 0;
 343         }
 344         write_unlock(&dndev_lock);
 345         if (old)
 346                 dev_put(dev);
 347         return rv;
 348 }
 349
 350 static void dn_dev_check_default(struct net_device *dev)
 351 {
 352         write_lock(&dndev_lock);
 353         if (dev == decnet_default_device) {
 354                 decnet_default_device = NULL;
 355         } else {
 356                 dev = NULL;
 357         }
 358         write_unlock(&dndev_lock);
 359         if (dev)
 360                 dev_put(dev);
 361 }
 362
 363 static int dn_forwarding_proc(ctl_table *table, int write,
 364                                 struct file *filep,
 365                                 void __user *buffer, size_t *lenp)
 366 {
 367 #ifdef CONFIG_DECNET_ROUTER
 368         struct net_device *dev = table->extra1;
 369         struct dn_dev *dn_db;
 370         int err;
 371         int tmp, old;
 372
 373         if (table->extra1 == NULL)
 374                 return -EINVAL;
 375
 376         dn_db = dev->dn_ptr;
 377         old = dn_db->parms.forwarding;
 378
 379         err = proc_dointvec(table, write, filep, buffer, lenp);
 380
 381         if ((err >= 0) && write) {
 382                 if (dn_db->parms.forwarding < 0)
 383                         dn_db->parms.forwarding = 0;
 384                 if (dn_db->parms.forwarding > 2)
 385                         dn_db->parms.forwarding = 2;
 386                 /*
 387                  * What an ugly hack this is... its works, just. It
 388                  * would be nice if sysctl/proc were just that little
 389                  * bit more flexible so I don't have to write a special
 390                  * routine, or suffer hacks like this - SJW
 391                  */
 392                 tmp = dn_db->parms.forwarding;
 393                 dn_db->parms.forwarding = old;
 394                 if (dn_db->parms.down)
 395                         dn_db->parms.down(dev);
 396                 dn_db->parms.forwarding = tmp;
 397                 if (dn_db->parms.up)
 398                         dn_db->parms.up(dev);
 399         }
 400
 401         return err;
 402 #else
 403         return -EINVAL;
 404 #endif
 405 }
 406
 407 static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
 408                         void __user *oldval, size_t __user *oldlenp,
 409                         void __user *newval, size_t newlen,
 410                         void **context)
 411 {
 412 #ifdef CONFIG_DECNET_ROUTER
 413         struct net_device *dev = table->extra1;
 414         struct dn_dev *dn_db;
 415         int value;
 416
 417         if (table->extra1 == NULL)
 418                 return -EINVAL;
 419
 420         dn_db = dev->dn_ptr;
 421
 422         if (newval && newlen) {
 423                 if (newlen != sizeof(int))
 424                         return -EINVAL;
 425
 426                 if (get_user(value, (int __user *)newval))
 427                         return -EFAULT;
 428                 if (value < 0)
 429                         return -EINVAL;
 430                 if (value > 2)
 431                         return -EINVAL;
 432
 433                 if (dn_db->parms.down)
 434                         dn_db->parms.down(dev);
 435                 dn_db->parms.forwarding = value;
 436                 if (dn_db->parms.up)
 437                         dn_db->parms.up(dev);
 438         }
 439
 440         return 0;
 441 #else
 442         return -EINVAL;
 443 #endif
 444 }
 445
 446 #else /* CONFIG_SYSCTL */
 447 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 448 {
 449 }
 450 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 451 {
 452 }
 453
 454 #endif /* CONFIG_SYSCTL */
 455
 456 static struct dn_ifaddr *dn_dev_alloc_ifa(void)
 457 {
 458         struct dn_ifaddr *ifa;
 459
 460         ifa = kmalloc(sizeof(*ifa), GFP_KERNEL);
 461
 462         if (ifa) {
 463                 memset(ifa, 0, sizeof(*ifa));
 464         }
 465
 466         return ifa;
 467 }
 468
 469 static __inline__ void dn_dev_free_ifa(struct dn_ifaddr *ifa)
 470 {
 471         kfree(ifa);
 472 }
 473
 474 static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr **ifap, int destroy)
 475 {
 476         struct dn_ifaddr *ifa1 = *ifap;
 477         unsigned char mac_addr[6];
 478         struct net_device *dev = dn_db->dev;
 479
 480         ASSERT_RTNL();
 481
 482         *ifap = ifa1->ifa_next;
 483
 484         if (dn_db->dev->type == ARPHRD_ETHER) {
 485                 if (ifa1->ifa_local != dn_htons(dn_eth2dn(dev->dev_addr))) {
 486                         dn_dn2eth(mac_addr, ifa1->ifa_local);
 487                         dev_mc_delete(dev, mac_addr, ETH_ALEN, 0);
 488                 }
 489         }
 490
 491         rtmsg_ifa(RTM_DELADDR, ifa1);
 492         notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
 493         if (destroy) {
 494                 dn_dev_free_ifa(ifa1);
 495
 496                 if (dn_db->ifa_list == NULL)
 497                         dn_dev_delete(dn_db->dev);
 498         }
 499 }
 500
 501 static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 502 {
 503         struct net_device *dev = dn_db->dev;
 504         struct dn_ifaddr *ifa1;
 505         unsigned char mac_addr[6];
 506
 507         ASSERT_RTNL();
 508
 509         /* Check for duplicates */
 510         for(ifa1 = dn_db->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
 511                 if (ifa1->ifa_local == ifa->ifa_local)
 512                         return -EEXIST;
 513         }
 514
 515         if (dev->type == ARPHRD_ETHER) {
 516                 if (ifa->ifa_local != dn_htons(dn_eth2dn(dev->dev_addr))) {
 517                         dn_dn2eth(mac_addr, ifa->ifa_local);
 518                         dev_mc_add(dev, mac_addr, ETH_ALEN, 0);
 519                         dev_mc_upload(dev);
 520                 }
 521         }
 522
 523         ifa->ifa_next = dn_db->ifa_list;
 524         dn_db->ifa_list = ifa;
 525
 526         rtmsg_ifa(RTM_NEWADDR, ifa);
 527         notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
 528
 529         return 0;
 530 }
 531
 532 static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
 533 {
 534         struct dn_dev *dn_db = dev->dn_ptr;
 535         int rv;
 536
 537         if (dn_db == NULL) {
 538                 int err;
 539                 dn_db = dn_dev_create(dev, &err);
 540                 if (dn_db == NULL)
 541                         return err;
 542         }
 543
 544         ifa->ifa_dev = dn_db;
 545
 546         if (dev->flags & IFF_LOOPBACK)
 547                 ifa->ifa_scope = RT_SCOPE_HOST;
 548
 549         rv = dn_dev_insert_ifa(dn_db, ifa);
 550         if (rv)
 551                 dn_dev_free_ifa(ifa);
 552         return rv;
 553 }
 554
 555
 556 int dn_dev_ioctl(unsigned int cmd, void __user *arg)
 557 {
 558         char buffer[DN_IFREQ_SIZE];
 559         struct ifreq *ifr = (struct ifreq *)buffer;
 560         struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
 561         struct dn_dev *dn_db;
 562         struct net_device *dev;
 563         struct dn_ifaddr *ifa = NULL, **ifap = NULL;
 564         int ret = 0;
 565
 566         if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
 567                 return -EFAULT;
 568         ifr->ifr_name[IFNAMSIZ-1] = 0;
 569
 570 #ifdef CONFIG_KMOD
 571         dev_load(ifr->ifr_name);
 572 #endif
 573
 574         switch(cmd) {
 575                 case SIOCGIFADDR:
 576                         break;
 577                 case SIOCSIFADDR:
 578                         if (!capable(CAP_NET_ADMIN))
 579                                 return -EACCES;
 580                         if (sdn->sdn_family != AF_DECnet)
 581                                 return -EINVAL;
 582                         break;
 583                 default:
 584                         return -EINVAL;
 585         }
 586
 587         rtnl_lock();
 588
 589         if ((dev = __dev_get_by_name(ifr->ifr_name)) == NULL) {
 590                 ret = -ENODEV;
 591                 goto done;
 592         }
 593
 594         if ((dn_db = dev->dn_ptr) != NULL) {
 595                 for (ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next)
 596                         if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
 597                                 break;
 598         }
 599
 600         if (ifa == NULL && cmd != SIOCSIFADDR) {
 601                 ret = -EADDRNOTAVAIL;
 602                 goto done;
 603         }
 604
 605         switch(cmd) {
 606                 case SIOCGIFADDR:
 607                         *((dn_address *)sdn->sdn_nodeaddr) = ifa->ifa_local;
 608                         goto rarok;
 609
 610                 case SIOCSIFADDR:
 611                         if (!ifa) {
 612                                 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
 613                                         ret = -ENOBUFS;
 614                                         break;
 615                                 }
 616                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 617                         } else {
 618                                 if (ifa->ifa_local == dn_saddr2dn(sdn))
 619                                         break;
 620                                 dn_dev_del_ifa(dn_db, ifap, 0);
 621                         }
 622
 623                         ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
 624
 625                         ret = dn_dev_set_ifa(dev, ifa);
 626         }
 627 done:
 628         rtnl_unlock();
 629
 630         return ret;
 631 rarok:
 632         if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
 633                 ret = -EFAULT;
 634         goto done;
 635 }
 636
 637 static struct dn_dev *dn_dev_by_index(int ifindex)
 638 {
 639         struct net_device *dev;
 640         struct dn_dev *dn_dev = NULL;
 641         dev = dev_get_by_index(ifindex);
 642         if (dev) {
 643                 dn_dev = dev->dn_ptr;
 644                 dev_put(dev);
 645         }
 646
 647         return dn_dev;
 648 }
 649
 650 static int dn_dev_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 651 {
 652         struct rtattr **rta = arg;
 653         struct dn_dev *dn_db;
 654         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
 655         struct dn_ifaddr *ifa, **ifap;
 656
 657         if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
 658                 return -EADDRNOTAVAIL;
 659
 660         for(ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next) {
 661                 void *tmp = rta[IFA_LOCAL-1];
 662                 if ((tmp && memcmp(RTA_DATA(tmp), &ifa->ifa_local, 2)) ||
 663                                 (rta[IFA_LABEL-1] && strcmp(RTA_DATA(rta[IFA_LABEL-1]), ifa->ifa_label)))
 664                         continue;
 665
 666                 dn_dev_del_ifa(dn_db, ifap, 1);
 667                 return 0;
 668         }
 669
 670         return -EADDRNOTAVAIL;
 671 }
 672
 673 static int dn_dev_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 674 {
 675         struct rtattr **rta = arg;
 676         struct net_device *dev;
 677         struct dn_dev *dn_db;
 678         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
 679         struct dn_ifaddr *ifa;
 680         int rv;
 681
 682         if (rta[IFA_LOCAL-1] == NULL)
 683                 return -EINVAL;
 684
 685         if ((dev = __dev_get_by_index(ifm->ifa_index)) == NULL)
 686                 return -ENODEV;
 687
 688         if ((dn_db = dev->dn_ptr) == NULL) {
 689                 int err;
 690                 dn_db = dn_dev_create(dev, &err);
 691                 if (!dn_db)
 692                         return err;
 693         }
 694
 695         if ((ifa = dn_dev_alloc_ifa()) == NULL)
 696                 return -ENOBUFS;
 697
 698         if (!rta[IFA_ADDRESS - 1])
 699                 rta[IFA_ADDRESS - 1] = rta[IFA_LOCAL - 1];
 700         memcpy(&ifa->ifa_local, RTA_DATA(rta[IFA_LOCAL-1]), 2);
 701         memcpy(&ifa->ifa_address, RTA_DATA(rta[IFA_ADDRESS-1]), 2);
 702         ifa->ifa_flags = ifm->ifa_flags;
 703         ifa->ifa_scope = ifm->ifa_scope;
 704         ifa->ifa_dev = dn_db;
 705         if (rta[IFA_LABEL-1])
 706                 memcpy(ifa->ifa_label, RTA_DATA(rta[IFA_LABEL-1]), IFNAMSIZ);
 707         else
 708                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 709
 710         rv = dn_dev_insert_ifa(dn_db, ifa);
 711         if (rv)
 712                 dn_dev_free_ifa(ifa);
 713         return rv;
 714 }
 715
 716 static int dn_dev_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
 717                                 u32 pid, u32 seq, int event)
 718 {
 719         struct ifaddrmsg *ifm;
 720         struct nlmsghdr *nlh;
 721         unsigned char *b = skb->tail;
 722
 723         nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*ifm));
 724         ifm = NLMSG_DATA(nlh);
 725
 726         ifm->ifa_family = AF_DECnet;
 727         ifm->ifa_prefixlen = 16;
 728         ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
 729         ifm->ifa_scope = ifa->ifa_scope;
 730         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
 731         if (ifa->ifa_address)
 732                 RTA_PUT(skb, IFA_ADDRESS, 2, &ifa->ifa_address);
 733         if (ifa->ifa_local)
 734                 RTA_PUT(skb, IFA_LOCAL, 2, &ifa->ifa_local);
 735         if (ifa->ifa_label[0])
 736                 RTA_PUT(skb, IFA_LABEL, IFNAMSIZ, &ifa->ifa_label);
 737         nlh->nlmsg_len = skb->tail - b;
 738         return skb->len;
 739
 740 nlmsg_failure:
 741 rtattr_failure:
 742         skb_trim(skb, b - skb->data);
 743         return -1;
 744 }
 745
 746 static void rtmsg_ifa(int event, struct dn_ifaddr *ifa)
 747 {
 748         struct sk_buff *skb;
 749         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
 750
 751         skb = alloc_skb(size, GFP_KERNEL);
 752         if (!skb) {
 753                 netlink_set_err(rtnl, 0, RTMGRP_DECnet_IFADDR, ENOBUFS);
 754                 return;
 755         }
 756         if (dn_dev_fill_ifaddr(skb, ifa, 0, 0, event) < 0) {
 757                 kfree_skb(skb);
 758                 netlink_set_err(rtnl, 0, RTMGRP_DECnet_IFADDR, EINVAL);
 759                 return;
 760         }
 761         NETLINK_CB(skb).dst_groups = RTMGRP_DECnet_IFADDR;
 762         netlink_broadcast(rtnl, skb, 0, RTMGRP_DECnet_IFADDR, GFP_KERNEL);
 763 }
 764
 765 static int dn_dev_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
 766 {
 767         int idx, dn_idx;
 768         int s_idx, s_dn_idx;
 769         struct net_device *dev;
 770         struct dn_dev *dn_db;
 771         struct dn_ifaddr *ifa;
 772
 773         s_idx = cb->args[0];
 774         s_dn_idx = dn_idx = cb->args[1];
 775         read_lock(&dev_base_lock);
 776         for(dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
 777                 if (idx < s_idx)
 778                         continue;
 779                 if (idx > s_idx)
 780                         s_dn_idx = 0;
 781                 if ((dn_db = dev->dn_ptr) == NULL)
 782                         continue;
 783
 784                 for(ifa = dn_db->ifa_list, dn_idx = 0; ifa; ifa = ifa->ifa_next, dn_idx++) {
 785                         if (dn_idx < s_dn_idx)
 786                                 continue;
 787
 788                         if (dn_dev_fill_ifaddr(skb, ifa,
 789                                                NETLINK_CB(cb->skb).pid,
 790                                                cb->nlh->nlmsg_seq,
 791                                                RTM_NEWADDR) <= 0)
 792                                 goto done;
 793                 }
 794         }
 795 done:
 796         read_unlock(&dev_base_lock);
 797         cb->args[0] = idx;
 798         cb->args[1] = dn_idx;
 799
 800         return skb->len;
 801 }
 802
 803 static int dn_dev_get_first(struct net_device *dev, dn_address *addr)
 804 {
 805         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 806         struct dn_ifaddr *ifa;
 807         int rv = -ENODEV;
 808         if (dn_db == NULL)
 809                 goto out;
 810         ifa = dn_db->ifa_list;
 811         if (ifa != NULL) {
 812                 *addr = ifa->ifa_local;
 813                 rv = 0;
 814         }
 815 out:
 816         return rv;
 817 }
 818
 819 /*
 820  * Find a default address to bind to.
 821  *
 822  * This is one of those areas where the initial VMS concepts don't really
 823  * map onto the Linux concepts, and since we introduced multiple addresses
 824  * per interface we have to cope with slightly odd ways of finding out what
 825  * "our address" really is. Mostly it's not a problem; for this we just guess
 826  * a sensible default. Eventually the routing code will take care of all the
 827  * nasties for us I hope.
 828  */
 829 int dn_dev_bind_default(dn_address *addr)
 830 {
 831         struct net_device *dev;
 832         int rv;
 833         dev = dn_dev_get_default();
 834 last_chance:
 835         if (dev) {
 836                 read_lock(&dev_base_lock);
 837                 rv = dn_dev_get_first(dev, addr);
 838                 read_unlock(&dev_base_lock);
 839                 dev_put(dev);
 840                 if (rv == 0 || dev == &loopback_dev)
 841                         return rv;
 842         }
 843         dev = &loopback_dev;
 844         dev_hold(dev);
 845         goto last_chance;
 846 }
 847
 848 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 849 {
 850         struct endnode_hello_message *msg;
 851         struct sk_buff *skb = NULL;
 852         unsigned short int *pktlen;
 853         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 854
 855         if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
 856                 return;
 857
 858         skb->dev = dev;
 859
 860         msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
 861
 862         msg->msgflg  = 0x0D;
 863         memcpy(msg->tiver, dn_eco_version, 3);
 864         dn_dn2eth(msg->id, ifa->ifa_local);
 865         msg->iinfo   = DN_RT_INFO_ENDN;
 866         msg->blksize = dn_htons(mtu2blksize(dev));
 867         msg->area    = 0x00;
 868         memset(msg->seed, 0, 8);
 869         memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
 870
 871         if (dn_db->router) {
 872                 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 873                 dn_dn2eth(msg->neighbor, dn->addr);
 874         }
 875
 876         msg->timer   = dn_htons((unsigned short)dn_db->parms.t3);
 877         msg->mpd     = 0x00;
 878         msg->datalen = 0x02;
 879         memset(msg->data, 0xAA, 2);
 880
 881         pktlen = (unsigned short *)skb_push(skb,2);
 882         *pktlen = dn_htons(skb->len - 2);
 883
 884         skb->nh.raw = skb->data;
 885
 886         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
 887 }
 888
 889
 890 #define DRDELAY (5 * HZ)
 891
 892 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 893 {
 894         /* First check time since device went up */
 895         if ((jiffies - dn_db->uptime) < DRDELAY)
 896                 return 0;
 897
 898         /* If there is no router, then yes... */
 899         if (!dn_db->router)
 900                 return 1;
 901
 902         /* otherwise only if we have a higher priority or.. */
 903         if (dn->priority < dn_db->parms.priority)
 904                 return 1;
 905
 906         /* if we have equal priority and a higher node number */
 907         if (dn->priority != dn_db->parms.priority)
 908                 return 0;
 909
 910         if (dn_ntohs(dn->addr) < dn_ntohs(ifa->ifa_local))
 911                 return 1;
 912
 913         return 0;
 914 }
 915
 916 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 917 {
 918         int n;
 919         struct dn_dev *dn_db = dev->dn_ptr;
 920         struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 921         struct sk_buff *skb;
 922         size_t size;
 923         unsigned char *ptr;
 924         unsigned char *i1, *i2;
 925         unsigned short *pktlen;
 926         char *src;
 927
 928         if (mtu2blksize(dev) < (26 + 7))
 929                 return;
 930
 931         n = mtu2blksize(dev) - 26;
 932         n /= 7;
 933
 934         if (n > 32)
 935                 n = 32;
 936
 937         size = 2 + 26 + 7 * n;
 938
 939         if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
 940                 return;
 941
 942         skb->dev = dev;
 943         ptr = skb_put(skb, size);
 944
 945         *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
 946         *ptr++ = 2; /* ECO */
 947         *ptr++ = 0;
 948         *ptr++ = 0;
 949         dn_dn2eth(ptr, ifa->ifa_local);
 950         src = ptr;
 951         ptr += ETH_ALEN;
 952         *ptr++ = dn_db->parms.forwarding == 1 ?
 953                         DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
 954         *((unsigned short *)ptr) = dn_htons(mtu2blksize(dev));
 955         ptr += 2;
 956         *ptr++ = dn_db->parms.priority; /* Priority */
 957         *ptr++ = 0; /* Area: Reserved */
 958         *((unsigned short *)ptr) = dn_htons((unsigned short)dn_db->parms.t3);
 959         ptr += 2;
 960         *ptr++ = 0; /* MPD: Reserved */
 961         i1 = ptr++;
 962         memset(ptr, 0, 7); /* Name: Reserved */
 963         ptr += 7;
 964         i2 = ptr++;
 965
 966         n = dn_neigh_elist(dev, ptr, n);
 967
 968         *i2 = 7 * n;
 969         *i1 = 8 + *i2;
 970
 971         skb_trim(skb, (27 + *i2));
 972
 973         pktlen = (unsigned short *)skb_push(skb, 2);
 974         *pktlen = dn_htons(skb->len - 2);
 975
 976         skb->nh.raw = skb->data;
 977
 978         if (dn_am_i_a_router(dn, dn_db, ifa)) {
 979                 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
 980                 if (skb2) {
 981                         dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
 982                 }
 983         }
 984
 985         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
 986 }
 987
 988 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 989 {
 990         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 991
 992         if (dn_db->parms.forwarding == 0)
 993                 dn_send_endnode_hello(dev, ifa);
 994         else
 995                 dn_send_router_hello(dev, ifa);
 996 }
 997
 998 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 999 {
1000         int tdlen = 16;
1001         int size = dev->hard_header_len + 2 + 4 + tdlen;
1002         struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1003         int i;
1004         unsigned char *ptr;
1005         char src[ETH_ALEN];
1006
1007         if (skb == NULL)
1008                 return ;
1009
1010         skb->dev = dev;
1011         skb_push(skb, dev->hard_header_len);
1012         ptr = skb_put(skb, 2 + 4 + tdlen);
1013
1014         *ptr++ = DN_RT_PKT_HELO;
1015         *((dn_address *)ptr) = ifa->ifa_local;
1016         ptr += 2;
1017         *ptr++ = tdlen;
1018
1019         for(i = 0; i < tdlen; i++)
1020                 *ptr++ = 0252;
1021
1022         dn_dn2eth(src, ifa->ifa_local);
1023         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1024 }
1025
1026 static int dn_eth_up(struct net_device *dev)
1027 {
1028         struct dn_dev *dn_db = dev->dn_ptr;
1029
1030         if (dn_db->parms.forwarding == 0)
1031                 dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1032         else
1033                 dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1034
1035         dev_mc_upload(dev);
1036
1037         dn_db->use_long = 1;
1038
1039         return 0;
1040 }
1041
1042 static void dn_eth_down(struct net_device *dev)
1043 {
1044         struct dn_dev *dn_db = dev->dn_ptr;
1045
1046         if (dn_db->parms.forwarding == 0)
1047                 dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1048         else
1049                 dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1050 }
1051
1052 static void dn_dev_set_timer(struct net_device *dev);
1053
1054 static void dn_dev_timer_func(unsigned long arg)
1055 {
1056         struct net_device *dev = (struct net_device *)arg;
1057         struct dn_dev *dn_db = dev->dn_ptr;
1058         struct dn_ifaddr *ifa;
1059
1060         if (dn_db->t3 <= dn_db->parms.t2) {
1061                 if (dn_db->parms.timer3) {
1062                         for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
1063                                 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1064                                         dn_db->parms.timer3(dev, ifa);
1065                         }
1066                 }
1067                 dn_db->t3 = dn_db->parms.t3;
1068         } else {
1069                 dn_db->t3 -= dn_db->parms.t2;
1070         }
1071
1072         dn_dev_set_timer(dev);
1073 }
1074
1075 static void dn_dev_set_timer(struct net_device *dev)
1076 {
1077         struct dn_dev *dn_db = dev->dn_ptr;
1078
1079         if (dn_db->parms.t2 > dn_db->parms.t3)
1080                 dn_db->parms.t2 = dn_db->parms.t3;
1081
1082         dn_db->timer.data = (unsigned long)dev;
1083         dn_db->timer.function = dn_dev_timer_func;
1084         dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1085
1086         add_timer(&dn_db->timer);
1087 }
1088
1089 struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1090 {
1091         int i;
1092         struct dn_dev_parms *p = dn_dev_list;
1093         struct dn_dev *dn_db;
1094
1095         for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1096                 if (p->type == dev->type)
1097                         break;
1098         }
1099
1100         *err = -ENODEV;
1101         if (i == DN_DEV_LIST_SIZE)
1102                 return NULL;
1103
1104         *err = -ENOBUFS;
1105         if ((dn_db = kmalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1106                 return NULL;
1107
1108         memset(dn_db, 0, sizeof(struct dn_dev));
1109         memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1110         dev->dn_ptr = dn_db;
1111         dn_db->dev = dev;
1112         init_timer(&dn_db->timer);
1113
1114         dn_db->uptime = jiffies;
1115         if (dn_db->parms.up) {
1116                 if (dn_db->parms.up(dev) < 0) {
1117                         dev->dn_ptr = NULL;
1118                         kfree(dn_db);
1119                         return NULL;
1120                 }
1121         }
1122
1123         dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1124
1125         dn_dev_sysctl_register(dev, &dn_db->parms);
1126
1127         dn_dev_set_timer(dev);
1128
1129         *err = 0;
1130         return dn_db;
1131 }
1132
1133
1134 /*
1135  * This processes a device up event. We only start up
1136  * the loopback device & ethernet devices with correct
1137  * MAC addreses automatically. Others must be started
1138  * specifically.
1139  *
1140  * FIXME: How should we configure the loopback address ? If we could dispense
1141  * with using decnet_address here and for autobind, it will be one less thing
1142  * for users to worry about setting up.
1143  */
1144
1145 void dn_dev_up(struct net_device *dev)
1146 {
1147         struct dn_ifaddr *ifa;
1148         dn_address addr = decnet_address;
1149         int maybe_default = 0;
1150         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1151
1152         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1153                 return;
1154
1155         /*
1156          * Need to ensure that loopback device has a dn_db attached to it
1157          * to allow creation of neighbours against it, even though it might
1158          * not have a local address of its own. Might as well do the same for
1159          * all autoconfigured interfaces.
1160          */
1161         if (dn_db == NULL) {
1162                 int err;
1163                 dn_db = dn_dev_create(dev, &err);
1164                 if (dn_db == NULL)
1165                         return;
1166         }
1167
1168         if (dev->type == ARPHRD_ETHER) {
1169                 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1170                         return;
1171                 addr = dn_htons(dn_eth2dn(dev->dev_addr));
1172                 maybe_default = 1;
1173         }
1174
1175         if (addr == 0)
1176                 return;
1177
1178         if ((ifa = dn_dev_alloc_ifa()) == NULL)
1179                 return;
1180
1181         ifa->ifa_local = ifa->ifa_address = addr;
1182         ifa->ifa_flags = 0;
1183         ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1184         strcpy(ifa->ifa_label, dev->name);
1185
1186         dn_dev_set_ifa(dev, ifa);
1187
1188         /*
1189          * Automagically set the default device to the first automatically
1190          * configured ethernet card in the system.
1191          */
1192         if (maybe_default) {
1193                 dev_hold(dev);
1194                 if (dn_dev_set_default(dev, 0))
1195                         dev_put(dev);
1196         }
1197 }
1198
1199 static void dn_dev_delete(struct net_device *dev)
1200 {
1201         struct dn_dev *dn_db = dev->dn_ptr;
1202
1203         if (dn_db == NULL)
1204                 return;
1205
1206         del_timer_sync(&dn_db->timer);
1207         dn_dev_sysctl_unregister(&dn_db->parms);
1208         dn_dev_check_default(dev);
1209         neigh_ifdown(&dn_neigh_table, dev);
1210
1211         if (dn_db->parms.down)
1212                 dn_db->parms.down(dev);
1213
1214         dev->dn_ptr = NULL;
1215
1216         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1217
1218         if (dn_db->router)
1219                 neigh_release(dn_db->router);
1220         if (dn_db->peer)
1221                 neigh_release(dn_db->peer);
1222
1223         kfree(dn_db);
1224 }
1225
1226 void dn_dev_down(struct net_device *dev)
1227 {
1228         struct dn_dev *dn_db = dev->dn_ptr;
1229         struct dn_ifaddr *ifa;
1230
1231         if (dn_db == NULL)
1232                 return;
1233
1234         while((ifa = dn_db->ifa_list) != NULL) {
1235                 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1236                 dn_dev_free_ifa(ifa);
1237         }
1238
1239         dn_dev_delete(dev);
1240 }
1241
1242 void dn_dev_init_pkt(struct sk_buff *skb)
1243 {
1244         return;
1245 }
1246
1247 void dn_dev_veri_pkt(struct sk_buff *skb)
1248 {
1249         return;
1250 }
1251
1252 void dn_dev_hello(struct sk_buff *skb)
1253 {
1254         return;
1255 }
1256
1257 void dn_dev_devices_off(void)
1258 {
1259         struct net_device *dev;
1260
1261         rtnl_lock();
1262         for(dev = dev_base; dev; dev = dev->next)
1263                 dn_dev_down(dev);
1264         rtnl_unlock();
1265
1266 }
1267
1268 void dn_dev_devices_on(void)
1269 {
1270         struct net_device *dev;
1271
1272         rtnl_lock();
1273         for(dev = dev_base; dev; dev = dev->next) {
1274                 if (dev->flags & IFF_UP)
1275                         dn_dev_up(dev);
1276         }
1277         rtnl_unlock();
1278 }
1279
1280 int register_dnaddr_notifier(struct notifier_block *nb)
1281 {
1282         return notifier_chain_register(&dnaddr_chain, nb);
1283 }
1284
1285 int unregister_dnaddr_notifier(struct notifier_block *nb)
1286 {
1287         return notifier_chain_unregister(&dnaddr_chain, nb);
1288 }
1289
1290 #ifdef CONFIG_DECNET_SIOCGIFCONF
1291 /*
1292  * Now we support multiple addresses per interface.
1293  * Since we don't want to break existing code, you have to enable
1294  * it as a compile time option. Probably you should use the
1295  * rtnetlink interface instead.
1296  */
1297 int dnet_gifconf(struct net_device *dev, char __user *buf, int len)
1298 {
1299         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1300         struct dn_ifaddr *ifa;
1301         char buffer[DN_IFREQ_SIZE];
1302         struct ifreq *ifr = (struct ifreq *)buffer;
1303         struct sockaddr_dn *addr = (struct sockaddr_dn *)&ifr->ifr_addr;
1304         int done = 0;
1305
1306         if ((dn_db == NULL) || ((ifa = dn_db->ifa_list) == NULL))
1307                 return 0;
1308
1309         for(; ifa; ifa = ifa->ifa_next) {
1310                 if (!buf) {
1311                         done += sizeof(DN_IFREQ_SIZE);
1312                         continue;
1313                 }
1314                 if (len < DN_IFREQ_SIZE)
1315                         return done;
1316                 memset(buffer, 0, DN_IFREQ_SIZE);
1317
1318                 if (ifa->ifa_label)
1319                         strcpy(ifr->ifr_name, ifa->ifa_label);
1320                 else
1321                         strcpy(ifr->ifr_name, dev->name);
1322
1323                 addr->sdn_family = AF_DECnet;
1324                 addr->sdn_add.a_len = 2;
1325                 memcpy(addr->sdn_add.a_addr, &ifa->ifa_local,
1326                         sizeof(dn_address));
1327
1328                 if (copy_to_user(buf, buffer, DN_IFREQ_SIZE)) {
1329                         done = -EFAULT;
1330                         break;
1331                 }
1332
1333                 buf  += DN_IFREQ_SIZE;
1334                 len  -= DN_IFREQ_SIZE;
1335                 done += DN_IFREQ_SIZE;
1336         }
1337
1338         return done;
1339 }
1340 #endif /* CONFIG_DECNET_SIOCGIFCONF */
1341
1342
1343 #ifdef CONFIG_PROC_FS
1344 static inline struct net_device *dn_dev_get_next(struct seq_file *seq, struct net_device *dev)
1345 {
1346         do {
1347                 dev = dev->next;
1348         } while(dev && !dev->dn_ptr);
1349
1350         return dev;
1351 }
1352
1353 static struct net_device *dn_dev_get_idx(struct seq_file *seq, loff_t pos)
1354 {
1355         struct net_device *dev;
1356
1357         dev = dev_base;
1358         if (dev && !dev->dn_ptr)
1359                 dev = dn_dev_get_next(seq, dev);
1360         if (pos) {
1361                 while(dev && (dev = dn_dev_get_next(seq, dev)))
1362                         --pos;
1363         }
1364         return dev;
1365 }
1366
1367 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1368 {
1369         if (*pos) {
1370                 struct net_device *dev;
1371                 read_lock(&dev_base_lock);
1372                 dev = dn_dev_get_idx(seq, *pos - 1);
1373                 if (dev == NULL)
1374                         read_unlock(&dev_base_lock);
1375                 return dev;
1376         }
1377         return SEQ_START_TOKEN;
1378 }
1379
1380 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1381 {
1382         struct net_device *dev = v;
1383         loff_t one = 1;
1384
1385         if (v == SEQ_START_TOKEN) {
1386                 dev = dn_dev_seq_start(seq, &one);
1387         } else {
1388                 dev = dn_dev_get_next(seq, dev);
1389                 if (dev == NULL)
1390                         read_unlock(&dev_base_lock);
1391         }
1392         ++*pos;
1393         return dev;
1394 }
1395
1396 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1397 {
1398         if (v && v != SEQ_START_TOKEN)
1399                 read_unlock(&dev_base_lock);
1400 }
1401
1402 static char *dn_type2asc(char type)
1403 {
1404         switch(type) {
1405                 case DN_DEV_BCAST:
1406                         return "B";
1407                 case DN_DEV_UCAST:
1408                         return "U";
1409                 case DN_DEV_MPOINT:
1410                         return "M";
1411         }
1412
1413         return "?";
1414 }
1415
1416 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1417 {
1418         if (v == SEQ_START_TOKEN)
1419                 seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1420         else {
1421                 struct net_device *dev = v;
1422                 char peer_buf[DN_ASCBUF_LEN];
1423                 char router_buf[DN_ASCBUF_LEN];
1424                 struct dn_dev *dn_db = dev->dn_ptr;
1425
1426                 seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1427                                 "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1428                                 dev->name ? dev->name : "???",
1429                                 dn_type2asc(dn_db->parms.mode),
1430                                 0, 0,
1431                                 dn_db->t3, dn_db->parms.t3,
1432                                 mtu2blksize(dev),
1433                                 dn_db->parms.priority,
1434                                 dn_db->parms.state, dn_db->parms.name,
1435                                 dn_db->router ? dn_addr2asc(dn_ntohs(*(dn_address *)dn_db->router->primary_key), router_buf) : "",
1436                                 dn_db->peer ? dn_addr2asc(dn_ntohs(*(dn_address *)dn_db->peer->primary_key), peer_buf) : "");
1437         }
1438         return 0;
1439 }
1440
1441 static struct seq_operations dn_dev_seq_ops = {
1442         .start  = dn_dev_seq_start,
1443         .next   = dn_dev_seq_next,
1444         .stop   = dn_dev_seq_stop,
1445         .show   = dn_dev_seq_show,
1446 };
1447
1448 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1449 {
1450         return seq_open(file, &dn_dev_seq_ops);
1451 }
1452
1453 static struct file_operations dn_dev_seq_fops = {
1454         .owner   = THIS_MODULE,
1455         .open    = dn_dev_seq_open,
1456         .read    = seq_read,
1457         .llseek  = seq_lseek,
1458         .release = seq_release,
1459 };
1460
1461 #endif /* CONFIG_PROC_FS */
1462
1463 static struct rtnetlink_link dnet_rtnetlink_table[RTM_MAX-RTM_BASE+1] =
1464 {
1465          [4] = { .doit   = dn_dev_rtm_newaddr,  },
1466          [5] = { .doit   = dn_dev_rtm_deladdr,  },
1467          [6] = { .dumpit = dn_dev_dump_ifaddr,  },
1468
1469 #ifdef CONFIG_DECNET_ROUTER
1470          [8] = { .doit   = dn_fib_rtm_newroute, },
1471          [9] = { .doit   = dn_fib_rtm_delroute, },
1472         [10] = { .doit   = dn_cache_getroute, .dumpit = dn_fib_dump, },
1473         [16] = { .doit   = dn_fib_rtm_newrule, },
1474         [17] = { .doit   = dn_fib_rtm_delrule, },
1475         [18] = { .dumpit = dn_fib_dump_rules,  },
1476 #else
1477         [10] = { .doit   = dn_cache_getroute, .dumpit = dn_cache_dump, },
1478 #endif
1479
1480 };
1481
1482 static int __initdata addr[2];
1483 static int __initdata num;
1484 module_param_array(addr, int, num, 0444);
1485 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1486
1487 void __init dn_dev_init(void)
1488 {
1489         if (addr[0] > 63 || addr[0] < 0) {
1490                 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1491                 return;
1492         }
1493
1494         if (addr[1] > 1023 || addr[1] < 0) {
1495                 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1496                 return;
1497         }
1498
1499         decnet_address = dn_htons((addr[0] << 10) | addr[1]);
1500
1501         dn_dev_devices_on();
1502 #ifdef CONFIG_DECNET_SIOCGIFCONF
1503         register_gifconf(PF_DECnet, dnet_gifconf);
1504 #endif /* CONFIG_DECNET_SIOCGIFCONF */
1505
1506         rtnetlink_links[PF_DECnet] = dnet_rtnetlink_table;
1507
1508         proc_net_fops_create("decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1509
1510 #ifdef CONFIG_SYSCTL
1511         {
1512                 int i;
1513                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1514                         dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1515         }
1516 #endif /* CONFIG_SYSCTL */
1517 }
1518
1519 void __exit dn_dev_cleanup(void)
1520 {
1521         rtnetlink_links[PF_DECnet] = NULL;
1522
1523 #ifdef CONFIG_DECNET_SIOCGIFCONF
1524         unregister_gifconf(PF_DECnet);
1525 #endif /* CONFIG_DECNET_SIOCGIFCONF */
1526
1527 #ifdef CONFIG_SYSCTL
1528         {
1529                 int i;
1530                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1531                         dn_dev_sysctl_unregister(&dn_dev_list[i]);
1532         }
1533 #endif /* CONFIG_SYSCTL */
1534
1535         proc_net_remove("decnet_dev");
1536
1537         dn_dev_devices_off();
1538 }