linux/net/decnet/dn_dev.c
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   1/*
   2 * DECnet       An implementation of the DECnet protocol suite for the LINUX
   3 *              operating system.  DECnet is implemented using the  BSD Socket
   4 *              interface as the means of communication with the user level.
   5 *
   6 *              DECnet Device Layer
   7 *
   8 * Authors:     Steve Whitehouse <SteveW@ACM.org>
   9 *              Eduardo Marcelo Serrat <emserrat@geocities.com>
  10 *
  11 * Changes:
  12 *          Steve Whitehouse : Devices now see incoming frames so they
  13 *                             can mark on who it came from.
  14 *          Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour
  15 *                             can now have a device specific setup func.
  16 *          Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/
  17 *          Steve Whitehouse : Fixed bug which sometimes killed timer
  18 *          Steve Whitehouse : Multiple ifaddr support
  19 *          Steve Whitehouse : SIOCGIFCONF is now a compile time option
  20 *          Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding
  21 *          Steve Whitehouse : Removed timer1 - it's a user space issue now
  22 *         Patrick Caulfield : Fixed router hello message format
  23 *          Steve Whitehouse : Got rid of constant sizes for blksize for
  24 *                             devices. All mtu based now.
  25 */
  26
  27#include <linux/capability.h>
  28#include <linux/module.h>
  29#include <linux/moduleparam.h>
  30#include <linux/init.h>
  31#include <linux/net.h>
  32#include <linux/netdevice.h>
  33#include <linux/proc_fs.h>
  34#include <linux/seq_file.h>
  35#include <linux/timer.h>
  36#include <linux/string.h>
  37#include <linux/if_addr.h>
  38#include <linux/if_arp.h>
  39#include <linux/if_ether.h>
  40#include <linux/skbuff.h>
  41#include <linux/sysctl.h>
  42#include <linux/notifier.h>
  43#include <asm/uaccess.h>
  44#include <asm/system.h>
  45#include <net/net_namespace.h>
  46#include <net/neighbour.h>
  47#include <net/dst.h>
  48#include <net/flow.h>
  49#include <net/fib_rules.h>
  50#include <net/netlink.h>
  51#include <net/dn.h>
  52#include <net/dn_dev.h>
  53#include <net/dn_route.h>
  54#include <net/dn_neigh.h>
  55#include <net/dn_fib.h>
  56
  57#define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
  58
  59static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
  60static char dn_rt_all_rt_mcast[ETH_ALEN]  = {0xAB,0x00,0x00,0x03,0x00,0x00};
  61static char dn_hiord[ETH_ALEN]            = {0xAA,0x00,0x04,0x00,0x00,0x00};
  62static unsigned char dn_eco_version[3]    = {0x02,0x00,0x00};
  63
  64extern struct neigh_table dn_neigh_table;
  65
  66/*
  67 * decnet_address is kept in network order.
  68 */
  69__le16 decnet_address = 0;
  70
  71static DEFINE_RWLOCK(dndev_lock);
  72static struct net_device *decnet_default_device;
  73static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
  74
  75static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
  76static void dn_dev_delete(struct net_device *dev);
  77static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa);
  78
  79static int dn_eth_up(struct net_device *);
  80static void dn_eth_down(struct net_device *);
  81static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  82static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  83
  84static struct dn_dev_parms dn_dev_list[] =  {
  85{
  86        .type =         ARPHRD_ETHER, /* Ethernet */
  87        .mode =         DN_DEV_BCAST,
  88        .state =        DN_DEV_S_RU,
  89        .t2 =           1,
  90        .t3 =           10,
  91        .name =         "ethernet",
  92        .ctl_name =     NET_DECNET_CONF_ETHER,
  93        .up =           dn_eth_up,
  94        .down =         dn_eth_down,
  95        .timer3 =       dn_send_brd_hello,
  96},
  97{
  98        .type =         ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
  99        .mode =         DN_DEV_BCAST,
 100        .state =        DN_DEV_S_RU,
 101        .t2 =           1,
 102        .t3 =           10,
 103        .name =         "ipgre",
 104        .ctl_name =     NET_DECNET_CONF_GRE,
 105        .timer3 =       dn_send_brd_hello,
 106},
 107#if 0
 108{
 109        .type =         ARPHRD_X25, /* Bog standard X.25 */
 110        .mode =         DN_DEV_UCAST,
 111        .state =        DN_DEV_S_DS,
 112        .t2 =           1,
 113        .t3 =           120,
 114        .name =         "x25",
 115        .ctl_name =     NET_DECNET_CONF_X25,
 116        .timer3 =       dn_send_ptp_hello,
 117},
 118#endif
 119#if 0
 120{
 121        .type =         ARPHRD_PPP, /* DECnet over PPP */
 122        .mode =         DN_DEV_BCAST,
 123        .state =        DN_DEV_S_RU,
 124        .t2 =           1,
 125        .t3 =           10,
 126        .name =         "ppp",
 127        .ctl_name =     NET_DECNET_CONF_PPP,
 128        .timer3 =       dn_send_brd_hello,
 129},
 130#endif
 131{
 132        .type =         ARPHRD_DDCMP, /* DECnet over DDCMP */
 133        .mode =         DN_DEV_UCAST,
 134        .state =        DN_DEV_S_DS,
 135        .t2 =           1,
 136        .t3 =           120,
 137        .name =         "ddcmp",
 138        .ctl_name =     NET_DECNET_CONF_DDCMP,
 139        .timer3 =       dn_send_ptp_hello,
 140},
 141{
 142        .type =         ARPHRD_LOOPBACK, /* Loopback interface - always last */
 143        .mode =         DN_DEV_BCAST,
 144        .state =        DN_DEV_S_RU,
 145        .t2 =           1,
 146        .t3 =           10,
 147        .name =         "loopback",
 148        .ctl_name =     NET_DECNET_CONF_LOOPBACK,
 149        .timer3 =       dn_send_brd_hello,
 150}
 151};
 152
 153#define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)
 154
 155#define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x)
 156
 157#ifdef CONFIG_SYSCTL
 158
 159static int min_t2[] = { 1 };
 160static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
 161static int min_t3[] = { 1 };
 162static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
 163
 164static int min_priority[1];
 165static int max_priority[] = { 127 }; /* From DECnet spec */
 166
 167static int dn_forwarding_proc(ctl_table *, int, struct file *,
 168                        void __user *, size_t *, loff_t *);
 169static int dn_forwarding_sysctl(ctl_table *table,
 170                        void __user *oldval, size_t __user *oldlenp,
 171                        void __user *newval, size_t newlen);
 172
 173static struct dn_dev_sysctl_table {
 174        struct ctl_table_header *sysctl_header;
 175        ctl_table dn_dev_vars[5];
 176} dn_dev_sysctl = {
 177        NULL,
 178        {
 179        {
 180                .ctl_name = NET_DECNET_CONF_DEV_FORWARDING,
 181                .procname = "forwarding",
 182                .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
 183                .maxlen = sizeof(int),
 184                .mode = 0644,
 185                .proc_handler = dn_forwarding_proc,
 186                .strategy = dn_forwarding_sysctl,
 187        },
 188        {
 189                .ctl_name = NET_DECNET_CONF_DEV_PRIORITY,
 190                .procname = "priority",
 191                .data = (void *)DN_DEV_PARMS_OFFSET(priority),
 192                .maxlen = sizeof(int),
 193                .mode = 0644,
 194                .proc_handler = proc_dointvec_minmax,
 195                .strategy = sysctl_intvec,
 196                .extra1 = &min_priority,
 197                .extra2 = &max_priority
 198        },
 199        {
 200                .ctl_name = NET_DECNET_CONF_DEV_T2,
 201                .procname = "t2",
 202                .data = (void *)DN_DEV_PARMS_OFFSET(t2),
 203                .maxlen = sizeof(int),
 204                .mode = 0644,
 205                .proc_handler = proc_dointvec_minmax,
 206                .strategy = sysctl_intvec,
 207                .extra1 = &min_t2,
 208                .extra2 = &max_t2
 209        },
 210        {
 211                .ctl_name = NET_DECNET_CONF_DEV_T3,
 212                .procname = "t3",
 213                .data = (void *)DN_DEV_PARMS_OFFSET(t3),
 214                .maxlen = sizeof(int),
 215                .mode = 0644,
 216                .proc_handler = proc_dointvec_minmax,
 217                .strategy = sysctl_intvec,
 218                .extra1 = &min_t3,
 219                .extra2 = &max_t3
 220        },
 221        {0}
 222        },
 223};
 224
 225static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 226{
 227        struct dn_dev_sysctl_table *t;
 228        int i;
 229
 230#define DN_CTL_PATH_DEV 3
 231
 232        struct ctl_path dn_ctl_path[] = {
 233                { .procname = "net", .ctl_name = CTL_NET, },
 234                { .procname = "decnet", .ctl_name = NET_DECNET, },
 235                { .procname = "conf", .ctl_name = NET_DECNET_CONF, },
 236                { /* to be set */ },
 237                { },
 238        };
 239
 240        t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
 241        if (t == NULL)
 242                return;
 243
 244        for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
 245                long offset = (long)t->dn_dev_vars[i].data;
 246                t->dn_dev_vars[i].data = ((char *)parms) + offset;
 247        }
 248
 249        if (dev) {
 250                dn_ctl_path[DN_CTL_PATH_DEV].procname = dev->name;
 251                dn_ctl_path[DN_CTL_PATH_DEV].ctl_name = dev->ifindex;
 252        } else {
 253                dn_ctl_path[DN_CTL_PATH_DEV].procname = parms->name;
 254                dn_ctl_path[DN_CTL_PATH_DEV].ctl_name = parms->ctl_name;
 255        }
 256
 257        t->dn_dev_vars[0].extra1 = (void *)dev;
 258
 259        t->sysctl_header = register_sysctl_paths(dn_ctl_path, t->dn_dev_vars);
 260        if (t->sysctl_header == NULL)
 261                kfree(t);
 262        else
 263                parms->sysctl = t;
 264}
 265
 266static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 267{
 268        if (parms->sysctl) {
 269                struct dn_dev_sysctl_table *t = parms->sysctl;
 270                parms->sysctl = NULL;
 271                unregister_sysctl_table(t->sysctl_header);
 272                kfree(t);
 273        }
 274}
 275
 276static int dn_forwarding_proc(ctl_table *table, int write,
 277                                struct file *filep,
 278                                void __user *buffer,
 279                                size_t *lenp, loff_t *ppos)
 280{
 281#ifdef CONFIG_DECNET_ROUTER
 282        struct net_device *dev = table->extra1;
 283        struct dn_dev *dn_db;
 284        int err;
 285        int tmp, old;
 286
 287        if (table->extra1 == NULL)
 288                return -EINVAL;
 289
 290        dn_db = dev->dn_ptr;
 291        old = dn_db->parms.forwarding;
 292
 293        err = proc_dointvec(table, write, filep, buffer, lenp, ppos);
 294
 295        if ((err >= 0) && write) {
 296                if (dn_db->parms.forwarding < 0)
 297                        dn_db->parms.forwarding = 0;
 298                if (dn_db->parms.forwarding > 2)
 299                        dn_db->parms.forwarding = 2;
 300                /*
 301                 * What an ugly hack this is... its works, just. It
 302                 * would be nice if sysctl/proc were just that little
 303                 * bit more flexible so I don't have to write a special
 304                 * routine, or suffer hacks like this - SJW
 305                 */
 306                tmp = dn_db->parms.forwarding;
 307                dn_db->parms.forwarding = old;
 308                if (dn_db->parms.down)
 309                        dn_db->parms.down(dev);
 310                dn_db->parms.forwarding = tmp;
 311                if (dn_db->parms.up)
 312                        dn_db->parms.up(dev);
 313        }
 314
 315        return err;
 316#else
 317        return -EINVAL;
 318#endif
 319}
 320
 321static int dn_forwarding_sysctl(ctl_table *table,
 322                        void __user *oldval, size_t __user *oldlenp,
 323                        void __user *newval, size_t newlen)
 324{
 325#ifdef CONFIG_DECNET_ROUTER
 326        struct net_device *dev = table->extra1;
 327        struct dn_dev *dn_db;
 328        int value;
 329
 330        if (table->extra1 == NULL)
 331                return -EINVAL;
 332
 333        dn_db = dev->dn_ptr;
 334
 335        if (newval && newlen) {
 336                if (newlen != sizeof(int))
 337                        return -EINVAL;
 338
 339                if (get_user(value, (int __user *)newval))
 340                        return -EFAULT;
 341                if (value < 0)
 342                        return -EINVAL;
 343                if (value > 2)
 344                        return -EINVAL;
 345
 346                if (dn_db->parms.down)
 347                        dn_db->parms.down(dev);
 348                dn_db->parms.forwarding = value;
 349                if (dn_db->parms.up)
 350                        dn_db->parms.up(dev);
 351        }
 352
 353        return 0;
 354#else
 355        return -EINVAL;
 356#endif
 357}
 358
 359#else /* CONFIG_SYSCTL */
 360static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 361{
 362}
 363static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 364{
 365}
 366
 367#endif /* CONFIG_SYSCTL */
 368
 369static inline __u16 mtu2blksize(struct net_device *dev)
 370{
 371        u32 blksize = dev->mtu;
 372        if (blksize > 0xffff)
 373                blksize = 0xffff;
 374
 375        if (dev->type == ARPHRD_ETHER ||
 376            dev->type == ARPHRD_PPP ||
 377            dev->type == ARPHRD_IPGRE ||
 378            dev->type == ARPHRD_LOOPBACK)
 379                blksize -= 2;
 380
 381        return (__u16)blksize;
 382}
 383
 384static struct dn_ifaddr *dn_dev_alloc_ifa(void)
 385{
 386        struct dn_ifaddr *ifa;
 387
 388        ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
 389
 390        return ifa;
 391}
 392
 393static __inline__ void dn_dev_free_ifa(struct dn_ifaddr *ifa)
 394{
 395        kfree(ifa);
 396}
 397
 398static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr **ifap, int destroy)
 399{
 400        struct dn_ifaddr *ifa1 = *ifap;
 401        unsigned char mac_addr[6];
 402        struct net_device *dev = dn_db->dev;
 403
 404        ASSERT_RTNL();
 405
 406        *ifap = ifa1->ifa_next;
 407
 408        if (dn_db->dev->type == ARPHRD_ETHER) {
 409                if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
 410                        dn_dn2eth(mac_addr, ifa1->ifa_local);
 411                        dev_mc_delete(dev, mac_addr, ETH_ALEN, 0);
 412                }
 413        }
 414
 415        dn_ifaddr_notify(RTM_DELADDR, ifa1);
 416        blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
 417        if (destroy) {
 418                dn_dev_free_ifa(ifa1);
 419
 420                if (dn_db->ifa_list == NULL)
 421                        dn_dev_delete(dn_db->dev);
 422        }
 423}
 424
 425static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 426{
 427        struct net_device *dev = dn_db->dev;
 428        struct dn_ifaddr *ifa1;
 429        unsigned char mac_addr[6];
 430
 431        ASSERT_RTNL();
 432
 433        /* Check for duplicates */
 434        for(ifa1 = dn_db->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
 435                if (ifa1->ifa_local == ifa->ifa_local)
 436                        return -EEXIST;
 437        }
 438
 439        if (dev->type == ARPHRD_ETHER) {
 440                if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
 441                        dn_dn2eth(mac_addr, ifa->ifa_local);
 442                        dev_mc_add(dev, mac_addr, ETH_ALEN, 0);
 443                }
 444        }
 445
 446        ifa->ifa_next = dn_db->ifa_list;
 447        dn_db->ifa_list = ifa;
 448
 449        dn_ifaddr_notify(RTM_NEWADDR, ifa);
 450        blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
 451
 452        return 0;
 453}
 454
 455static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
 456{
 457        struct dn_dev *dn_db = dev->dn_ptr;
 458        int rv;
 459
 460        if (dn_db == NULL) {
 461                int err;
 462                dn_db = dn_dev_create(dev, &err);
 463                if (dn_db == NULL)
 464                        return err;
 465        }
 466
 467        ifa->ifa_dev = dn_db;
 468
 469        if (dev->flags & IFF_LOOPBACK)
 470                ifa->ifa_scope = RT_SCOPE_HOST;
 471
 472        rv = dn_dev_insert_ifa(dn_db, ifa);
 473        if (rv)
 474                dn_dev_free_ifa(ifa);
 475        return rv;
 476}
 477
 478
 479int dn_dev_ioctl(unsigned int cmd, void __user *arg)
 480{
 481        char buffer[DN_IFREQ_SIZE];
 482        struct ifreq *ifr = (struct ifreq *)buffer;
 483        struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
 484        struct dn_dev *dn_db;
 485        struct net_device *dev;
 486        struct dn_ifaddr *ifa = NULL, **ifap = NULL;
 487        int ret = 0;
 488
 489        if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
 490                return -EFAULT;
 491        ifr->ifr_name[IFNAMSIZ-1] = 0;
 492
 493        dev_load(&init_net, ifr->ifr_name);
 494
 495        switch(cmd) {
 496                case SIOCGIFADDR:
 497                        break;
 498                case SIOCSIFADDR:
 499                        if (!capable(CAP_NET_ADMIN))
 500                                return -EACCES;
 501                        if (sdn->sdn_family != AF_DECnet)
 502                                return -EINVAL;
 503                        break;
 504                default:
 505                        return -EINVAL;
 506        }
 507
 508        rtnl_lock();
 509
 510        if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
 511                ret = -ENODEV;
 512                goto done;
 513        }
 514
 515        if ((dn_db = dev->dn_ptr) != NULL) {
 516                for (ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next)
 517                        if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
 518                                break;
 519        }
 520
 521        if (ifa == NULL && cmd != SIOCSIFADDR) {
 522                ret = -EADDRNOTAVAIL;
 523                goto done;
 524        }
 525
 526        switch(cmd) {
 527                case SIOCGIFADDR:
 528                        *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
 529                        goto rarok;
 530
 531                case SIOCSIFADDR:
 532                        if (!ifa) {
 533                                if ((ifa = dn_dev_alloc_ifa()) == NULL) {
 534                                        ret = -ENOBUFS;
 535                                        break;
 536                                }
 537                                memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 538                        } else {
 539                                if (ifa->ifa_local == dn_saddr2dn(sdn))
 540                                        break;
 541                                dn_dev_del_ifa(dn_db, ifap, 0);
 542                        }
 543
 544                        ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
 545
 546                        ret = dn_dev_set_ifa(dev, ifa);
 547        }
 548done:
 549        rtnl_unlock();
 550
 551        return ret;
 552rarok:
 553        if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
 554                ret = -EFAULT;
 555        goto done;
 556}
 557
 558struct net_device *dn_dev_get_default(void)
 559{
 560        struct net_device *dev;
 561        read_lock(&dndev_lock);
 562        dev = decnet_default_device;
 563        if (dev) {
 564                if (dev->dn_ptr)
 565                        dev_hold(dev);
 566                else
 567                        dev = NULL;
 568        }
 569        read_unlock(&dndev_lock);
 570        return dev;
 571}
 572
 573int dn_dev_set_default(struct net_device *dev, int force)
 574{
 575        struct net_device *old = NULL;
 576        int rv = -EBUSY;
 577        if (!dev->dn_ptr)
 578                return -ENODEV;
 579        write_lock(&dndev_lock);
 580        if (force || decnet_default_device == NULL) {
 581                old = decnet_default_device;
 582                decnet_default_device = dev;
 583                rv = 0;
 584        }
 585        write_unlock(&dndev_lock);
 586        if (old)
 587                dev_put(old);
 588        return rv;
 589}
 590
 591static void dn_dev_check_default(struct net_device *dev)
 592{
 593        write_lock(&dndev_lock);
 594        if (dev == decnet_default_device) {
 595                decnet_default_device = NULL;
 596        } else {
 597                dev = NULL;
 598        }
 599        write_unlock(&dndev_lock);
 600        if (dev)
 601                dev_put(dev);
 602}
 603
 604static struct dn_dev *dn_dev_by_index(int ifindex)
 605{
 606        struct net_device *dev;
 607        struct dn_dev *dn_dev = NULL;
 608        dev = dev_get_by_index(&init_net, ifindex);
 609        if (dev) {
 610                dn_dev = dev->dn_ptr;
 611                dev_put(dev);
 612        }
 613
 614        return dn_dev;
 615}
 616
 617static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
 618        [IFA_ADDRESS]           = { .type = NLA_U16 },
 619        [IFA_LOCAL]             = { .type = NLA_U16 },
 620        [IFA_LABEL]             = { .type = NLA_STRING,
 621                                    .len = IFNAMSIZ - 1 },
 622};
 623
 624static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 625{
 626        struct net *net = sock_net(skb->sk);
 627        struct nlattr *tb[IFA_MAX+1];
 628        struct dn_dev *dn_db;
 629        struct ifaddrmsg *ifm;
 630        struct dn_ifaddr *ifa, **ifap;
 631        int err = -EINVAL;
 632
 633        if (net != &init_net)
 634                goto errout;
 635
 636        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
 637        if (err < 0)
 638                goto errout;
 639
 640        err = -ENODEV;
 641        ifm = nlmsg_data(nlh);
 642        if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
 643                goto errout;
 644
 645        err = -EADDRNOTAVAIL;
 646        for (ifap = &dn_db->ifa_list; (ifa = *ifap); ifap = &ifa->ifa_next) {
 647                if (tb[IFA_LOCAL] &&
 648                    nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
 649                        continue;
 650
 651                if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
 652                        continue;
 653
 654                dn_dev_del_ifa(dn_db, ifap, 1);
 655                return 0;
 656        }
 657
 658errout:
 659        return err;
 660}
 661
 662static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 663{
 664        struct net *net = sock_net(skb->sk);
 665        struct nlattr *tb[IFA_MAX+1];
 666        struct net_device *dev;
 667        struct dn_dev *dn_db;
 668        struct ifaddrmsg *ifm;
 669        struct dn_ifaddr *ifa;
 670        int err;
 671
 672        if (net != &init_net)
 673                return -EINVAL;
 674
 675        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
 676        if (err < 0)
 677                return err;
 678
 679        if (tb[IFA_LOCAL] == NULL)
 680                return -EINVAL;
 681
 682        ifm = nlmsg_data(nlh);
 683        if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
 684                return -ENODEV;
 685
 686        if ((dn_db = dev->dn_ptr) == NULL) {
 687                int err;
 688                dn_db = dn_dev_create(dev, &err);
 689                if (!dn_db)
 690                        return err;
 691        }
 692
 693        if ((ifa = dn_dev_alloc_ifa()) == NULL)
 694                return -ENOBUFS;
 695
 696        if (tb[IFA_ADDRESS] == NULL)
 697                tb[IFA_ADDRESS] = tb[IFA_LOCAL];
 698
 699        ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
 700        ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
 701        ifa->ifa_flags = ifm->ifa_flags;
 702        ifa->ifa_scope = ifm->ifa_scope;
 703        ifa->ifa_dev = dn_db;
 704
 705        if (tb[IFA_LABEL])
 706                nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
 707        else
 708                memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 709
 710        err = dn_dev_insert_ifa(dn_db, ifa);
 711        if (err)
 712                dn_dev_free_ifa(ifa);
 713
 714        return err;
 715}
 716
 717static inline size_t dn_ifaddr_nlmsg_size(void)
 718{
 719        return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
 720               + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
 721               + nla_total_size(2) /* IFA_ADDRESS */
 722               + nla_total_size(2); /* IFA_LOCAL */
 723}
 724
 725static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
 726                             u32 pid, u32 seq, int event, unsigned int flags)
 727{
 728        struct ifaddrmsg *ifm;
 729        struct nlmsghdr *nlh;
 730
 731        nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
 732        if (nlh == NULL)
 733                return -EMSGSIZE;
 734
 735        ifm = nlmsg_data(nlh);
 736        ifm->ifa_family = AF_DECnet;
 737        ifm->ifa_prefixlen = 16;
 738        ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
 739        ifm->ifa_scope = ifa->ifa_scope;
 740        ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
 741
 742        if (ifa->ifa_address)
 743                NLA_PUT_LE16(skb, IFA_ADDRESS, ifa->ifa_address);
 744        if (ifa->ifa_local)
 745                NLA_PUT_LE16(skb, IFA_LOCAL, ifa->ifa_local);
 746        if (ifa->ifa_label[0])
 747                NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
 748
 749        return nlmsg_end(skb, nlh);
 750
 751nla_put_failure:
 752        nlmsg_cancel(skb, nlh);
 753        return -EMSGSIZE;
 754}
 755
 756static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
 757{
 758        struct sk_buff *skb;
 759        int err = -ENOBUFS;
 760
 761        skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
 762        if (skb == NULL)
 763                goto errout;
 764
 765        err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
 766        if (err < 0) {
 767                /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
 768                WARN_ON(err == -EMSGSIZE);
 769                kfree_skb(skb);
 770                goto errout;
 771        }
 772        err = rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
 773errout:
 774        if (err < 0)
 775                rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
 776}
 777
 778static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
 779{
 780        struct net *net = sock_net(skb->sk);
 781        int idx, dn_idx = 0, skip_ndevs, skip_naddr;
 782        struct net_device *dev;
 783        struct dn_dev *dn_db;
 784        struct dn_ifaddr *ifa;
 785
 786        if (net != &init_net)
 787                return 0;
 788
 789        skip_ndevs = cb->args[0];
 790        skip_naddr = cb->args[1];
 791
 792        idx = 0;
 793        for_each_netdev(&init_net, dev) {
 794                if (idx < skip_ndevs)
 795                        goto cont;
 796                else if (idx > skip_ndevs) {
 797                        /* Only skip over addresses for first dev dumped
 798                         * in this iteration (idx == skip_ndevs) */
 799                        skip_naddr = 0;
 800                }
 801
 802                if ((dn_db = dev->dn_ptr) == NULL)
 803                        goto cont;
 804
 805                for (ifa = dn_db->ifa_list, dn_idx = 0; ifa;
 806                     ifa = ifa->ifa_next, dn_idx++) {
 807                        if (dn_idx < skip_naddr)
 808                                continue;
 809
 810                        if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
 811                                              cb->nlh->nlmsg_seq, RTM_NEWADDR,
 812                                              NLM_F_MULTI) < 0)
 813                                goto done;
 814                }
 815cont:
 816                idx++;
 817        }
 818done:
 819        cb->args[0] = idx;
 820        cb->args[1] = dn_idx;
 821
 822        return skb->len;
 823}
 824
 825static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
 826{
 827        struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 828        struct dn_ifaddr *ifa;
 829        int rv = -ENODEV;
 830        if (dn_db == NULL)
 831                goto out;
 832        ifa = dn_db->ifa_list;
 833        if (ifa != NULL) {
 834                *addr = ifa->ifa_local;
 835                rv = 0;
 836        }
 837out:
 838        return rv;
 839}
 840
 841/*
 842 * Find a default address to bind to.
 843 *
 844 * This is one of those areas where the initial VMS concepts don't really
 845 * map onto the Linux concepts, and since we introduced multiple addresses
 846 * per interface we have to cope with slightly odd ways of finding out what
 847 * "our address" really is. Mostly it's not a problem; for this we just guess
 848 * a sensible default. Eventually the routing code will take care of all the
 849 * nasties for us I hope.
 850 */
 851int dn_dev_bind_default(__le16 *addr)
 852{
 853        struct net_device *dev;
 854        int rv;
 855        dev = dn_dev_get_default();
 856last_chance:
 857        if (dev) {
 858                read_lock(&dev_base_lock);
 859                rv = dn_dev_get_first(dev, addr);
 860                read_unlock(&dev_base_lock);
 861                dev_put(dev);
 862                if (rv == 0 || dev == init_net.loopback_dev)
 863                        return rv;
 864        }
 865        dev = init_net.loopback_dev;
 866        dev_hold(dev);
 867        goto last_chance;
 868}
 869
 870static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 871{
 872        struct endnode_hello_message *msg;
 873        struct sk_buff *skb = NULL;
 874        __le16 *pktlen;
 875        struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 876
 877        if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
 878                return;
 879
 880        skb->dev = dev;
 881
 882        msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
 883
 884        msg->msgflg  = 0x0D;
 885        memcpy(msg->tiver, dn_eco_version, 3);
 886        dn_dn2eth(msg->id, ifa->ifa_local);
 887        msg->iinfo   = DN_RT_INFO_ENDN;
 888        msg->blksize = cpu_to_le16(mtu2blksize(dev));
 889        msg->area    = 0x00;
 890        memset(msg->seed, 0, 8);
 891        memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
 892
 893        if (dn_db->router) {
 894                struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 895                dn_dn2eth(msg->neighbor, dn->addr);
 896        }
 897
 898        msg->timer   = cpu_to_le16((unsigned short)dn_db->parms.t3);
 899        msg->mpd     = 0x00;
 900        msg->datalen = 0x02;
 901        memset(msg->data, 0xAA, 2);
 902
 903        pktlen = (__le16 *)skb_push(skb,2);
 904        *pktlen = cpu_to_le16(skb->len - 2);
 905
 906        skb_reset_network_header(skb);
 907
 908        dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
 909}
 910
 911
 912#define DRDELAY (5 * HZ)
 913
 914static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 915{
 916        /* First check time since device went up */
 917        if ((jiffies - dn_db->uptime) < DRDELAY)
 918                return 0;
 919
 920        /* If there is no router, then yes... */
 921        if (!dn_db->router)
 922                return 1;
 923
 924        /* otherwise only if we have a higher priority or.. */
 925        if (dn->priority < dn_db->parms.priority)
 926                return 1;
 927
 928        /* if we have equal priority and a higher node number */
 929        if (dn->priority != dn_db->parms.priority)
 930                return 0;
 931
 932        if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
 933                return 1;
 934
 935        return 0;
 936}
 937
 938static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 939{
 940        int n;
 941        struct dn_dev *dn_db = dev->dn_ptr;
 942        struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 943        struct sk_buff *skb;
 944        size_t size;
 945        unsigned char *ptr;
 946        unsigned char *i1, *i2;
 947        __le16 *pktlen;
 948        char *src;
 949
 950        if (mtu2blksize(dev) < (26 + 7))
 951                return;
 952
 953        n = mtu2blksize(dev) - 26;
 954        n /= 7;
 955
 956        if (n > 32)
 957                n = 32;
 958
 959        size = 2 + 26 + 7 * n;
 960
 961        if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
 962                return;
 963
 964        skb->dev = dev;
 965        ptr = skb_put(skb, size);
 966
 967        *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
 968        *ptr++ = 2; /* ECO */
 969        *ptr++ = 0;
 970        *ptr++ = 0;
 971        dn_dn2eth(ptr, ifa->ifa_local);
 972        src = ptr;
 973        ptr += ETH_ALEN;
 974        *ptr++ = dn_db->parms.forwarding == 1 ?
 975                        DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
 976        *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
 977        ptr += 2;
 978        *ptr++ = dn_db->parms.priority; /* Priority */
 979        *ptr++ = 0; /* Area: Reserved */
 980        *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
 981        ptr += 2;
 982        *ptr++ = 0; /* MPD: Reserved */
 983        i1 = ptr++;
 984        memset(ptr, 0, 7); /* Name: Reserved */
 985        ptr += 7;
 986        i2 = ptr++;
 987
 988        n = dn_neigh_elist(dev, ptr, n);
 989
 990        *i2 = 7 * n;
 991        *i1 = 8 + *i2;
 992
 993        skb_trim(skb, (27 + *i2));
 994
 995        pktlen = (__le16 *)skb_push(skb, 2);
 996        *pktlen = cpu_to_le16(skb->len - 2);
 997
 998        skb_reset_network_header(skb);
 999
1000        if (dn_am_i_a_router(dn, dn_db, ifa)) {
1001                struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
1002                if (skb2) {
1003                        dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
1004                }
1005        }
1006
1007        dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1008}
1009
1010static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1011{
1012        struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1013
1014        if (dn_db->parms.forwarding == 0)
1015                dn_send_endnode_hello(dev, ifa);
1016        else
1017                dn_send_router_hello(dev, ifa);
1018}
1019
1020static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1021{
1022        int tdlen = 16;
1023        int size = dev->hard_header_len + 2 + 4 + tdlen;
1024        struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1025        int i;
1026        unsigned char *ptr;
1027        char src[ETH_ALEN];
1028
1029        if (skb == NULL)
1030                return ;
1031
1032        skb->dev = dev;
1033        skb_push(skb, dev->hard_header_len);
1034        ptr = skb_put(skb, 2 + 4 + tdlen);
1035
1036        *ptr++ = DN_RT_PKT_HELO;
1037        *((__le16 *)ptr) = ifa->ifa_local;
1038        ptr += 2;
1039        *ptr++ = tdlen;
1040
1041        for(i = 0; i < tdlen; i++)
1042                *ptr++ = 0252;
1043
1044        dn_dn2eth(src, ifa->ifa_local);
1045        dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1046}
1047
1048static int dn_eth_up(struct net_device *dev)
1049{
1050        struct dn_dev *dn_db = dev->dn_ptr;
1051
1052        if (dn_db->parms.forwarding == 0)
1053                dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1054        else
1055                dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1056
1057        dn_db->use_long = 1;
1058
1059        return 0;
1060}
1061
1062static void dn_eth_down(struct net_device *dev)
1063{
1064        struct dn_dev *dn_db = dev->dn_ptr;
1065
1066        if (dn_db->parms.forwarding == 0)
1067                dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1068        else
1069                dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1070}
1071
1072static void dn_dev_set_timer(struct net_device *dev);
1073
1074static void dn_dev_timer_func(unsigned long arg)
1075{
1076        struct net_device *dev = (struct net_device *)arg;
1077        struct dn_dev *dn_db = dev->dn_ptr;
1078        struct dn_ifaddr *ifa;
1079
1080        if (dn_db->t3 <= dn_db->parms.t2) {
1081                if (dn_db->parms.timer3) {
1082                        for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
1083                                if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1084                                        dn_db->parms.timer3(dev, ifa);
1085                        }
1086                }
1087                dn_db->t3 = dn_db->parms.t3;
1088        } else {
1089                dn_db->t3 -= dn_db->parms.t2;
1090        }
1091
1092        dn_dev_set_timer(dev);
1093}
1094
1095static void dn_dev_set_timer(struct net_device *dev)
1096{
1097        struct dn_dev *dn_db = dev->dn_ptr;
1098
1099        if (dn_db->parms.t2 > dn_db->parms.t3)
1100                dn_db->parms.t2 = dn_db->parms.t3;
1101
1102        dn_db->timer.data = (unsigned long)dev;
1103        dn_db->timer.function = dn_dev_timer_func;
1104        dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1105
1106        add_timer(&dn_db->timer);
1107}
1108
1109static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1110{
1111        int i;
1112        struct dn_dev_parms *p = dn_dev_list;
1113        struct dn_dev *dn_db;
1114
1115        for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1116                if (p->type == dev->type)
1117                        break;
1118        }
1119
1120        *err = -ENODEV;
1121        if (i == DN_DEV_LIST_SIZE)
1122                return NULL;
1123
1124        *err = -ENOBUFS;
1125        if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1126                return NULL;
1127
1128        memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1129        smp_wmb();
1130        dev->dn_ptr = dn_db;
1131        dn_db->dev = dev;
1132        init_timer(&dn_db->timer);
1133
1134        dn_db->uptime = jiffies;
1135
1136        dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1137        if (!dn_db->neigh_parms) {
1138                dev->dn_ptr = NULL;
1139                kfree(dn_db);
1140                return NULL;
1141        }
1142
1143        if (dn_db->parms.up) {
1144                if (dn_db->parms.up(dev) < 0) {
1145                        neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1146                        dev->dn_ptr = NULL;
1147                        kfree(dn_db);
1148                        return NULL;
1149                }
1150        }
1151
1152        dn_dev_sysctl_register(dev, &dn_db->parms);
1153
1154        dn_dev_set_timer(dev);
1155
1156        *err = 0;
1157        return dn_db;
1158}
1159
1160
1161/*
1162 * This processes a device up event. We only start up
1163 * the loopback device & ethernet devices with correct
1164 * MAC addreses automatically. Others must be started
1165 * specifically.
1166 *
1167 * FIXME: How should we configure the loopback address ? If we could dispense
1168 * with using decnet_address here and for autobind, it will be one less thing
1169 * for users to worry about setting up.
1170 */
1171
1172void dn_dev_up(struct net_device *dev)
1173{
1174        struct dn_ifaddr *ifa;
1175        __le16 addr = decnet_address;
1176        int maybe_default = 0;
1177        struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1178
1179        if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1180                return;
1181
1182        /*
1183         * Need to ensure that loopback device has a dn_db attached to it
1184         * to allow creation of neighbours against it, even though it might
1185         * not have a local address of its own. Might as well do the same for
1186         * all autoconfigured interfaces.
1187         */
1188        if (dn_db == NULL) {
1189                int err;
1190                dn_db = dn_dev_create(dev, &err);
1191                if (dn_db == NULL)
1192                        return;
1193        }
1194
1195        if (dev->type == ARPHRD_ETHER) {
1196                if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1197                        return;
1198                addr = dn_eth2dn(dev->dev_addr);
1199                maybe_default = 1;
1200        }
1201
1202        if (addr == 0)
1203                return;
1204
1205        if ((ifa = dn_dev_alloc_ifa()) == NULL)
1206                return;
1207
1208        ifa->ifa_local = ifa->ifa_address = addr;
1209        ifa->ifa_flags = 0;
1210        ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1211        strcpy(ifa->ifa_label, dev->name);
1212
1213        dn_dev_set_ifa(dev, ifa);
1214
1215        /*
1216         * Automagically set the default device to the first automatically
1217         * configured ethernet card in the system.
1218         */
1219        if (maybe_default) {
1220                dev_hold(dev);
1221                if (dn_dev_set_default(dev, 0))
1222                        dev_put(dev);
1223        }
1224}
1225
1226static void dn_dev_delete(struct net_device *dev)
1227{
1228        struct dn_dev *dn_db = dev->dn_ptr;
1229
1230        if (dn_db == NULL)
1231                return;
1232
1233        del_timer_sync(&dn_db->timer);
1234        dn_dev_sysctl_unregister(&dn_db->parms);
1235        dn_dev_check_default(dev);
1236        neigh_ifdown(&dn_neigh_table, dev);
1237
1238        if (dn_db->parms.down)
1239                dn_db->parms.down(dev);
1240
1241        dev->dn_ptr = NULL;
1242
1243        neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1244        neigh_ifdown(&dn_neigh_table, dev);
1245
1246        if (dn_db->router)
1247                neigh_release(dn_db->router);
1248        if (dn_db->peer)
1249                neigh_release(dn_db->peer);
1250
1251        kfree(dn_db);
1252}
1253
1254void dn_dev_down(struct net_device *dev)
1255{
1256        struct dn_dev *dn_db = dev->dn_ptr;
1257        struct dn_ifaddr *ifa;
1258
1259        if (dn_db == NULL)
1260                return;
1261
1262        while((ifa = dn_db->ifa_list) != NULL) {
1263                dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1264                dn_dev_free_ifa(ifa);
1265        }
1266
1267        dn_dev_delete(dev);
1268}
1269
1270void dn_dev_init_pkt(struct sk_buff *skb)
1271{
1272        return;
1273}
1274
1275void dn_dev_veri_pkt(struct sk_buff *skb)
1276{
1277        return;
1278}
1279
1280void dn_dev_hello(struct sk_buff *skb)
1281{
1282        return;
1283}
1284
1285void dn_dev_devices_off(void)
1286{
1287        struct net_device *dev;
1288
1289        rtnl_lock();
1290        for_each_netdev(&init_net, dev)
1291                dn_dev_down(dev);
1292        rtnl_unlock();
1293
1294}
1295
1296void dn_dev_devices_on(void)
1297{
1298        struct net_device *dev;
1299
1300        rtnl_lock();
1301        for_each_netdev(&init_net, dev) {
1302                if (dev->flags & IFF_UP)
1303                        dn_dev_up(dev);
1304        }
1305        rtnl_unlock();
1306}
1307
1308int register_dnaddr_notifier(struct notifier_block *nb)
1309{
1310        return blocking_notifier_chain_register(&dnaddr_chain, nb);
1311}
1312
1313int unregister_dnaddr_notifier(struct notifier_block *nb)
1314{
1315        return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1316}
1317
1318#ifdef CONFIG_PROC_FS
1319static inline int is_dn_dev(struct net_device *dev)
1320{
1321        return dev->dn_ptr != NULL;
1322}
1323
1324static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1325{
1326        int i;
1327        struct net_device *dev;
1328
1329        read_lock(&dev_base_lock);
1330
1331        if (*pos == 0)
1332                return SEQ_START_TOKEN;
1333
1334        i = 1;
1335        for_each_netdev(&init_net, dev) {
1336                if (!is_dn_dev(dev))
1337                        continue;
1338
1339                if (i++ == *pos)
1340                        return dev;
1341        }
1342
1343        return NULL;
1344}
1345
1346static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1347{
1348        struct net_device *dev;
1349
1350        ++*pos;
1351
1352        dev = (struct net_device *)v;
1353        if (v == SEQ_START_TOKEN)
1354                dev = net_device_entry(&init_net.dev_base_head);
1355
1356        for_each_netdev_continue(&init_net, dev) {
1357                if (!is_dn_dev(dev))
1358                        continue;
1359
1360                return dev;
1361        }
1362
1363        return NULL;
1364}
1365
1366static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1367{
1368        read_unlock(&dev_base_lock);
1369}
1370
1371static char *dn_type2asc(char type)
1372{
1373        switch(type) {
1374                case DN_DEV_BCAST:
1375                        return "B";
1376                case DN_DEV_UCAST:
1377                        return "U";
1378                case DN_DEV_MPOINT:
1379                        return "M";
1380        }
1381
1382        return "?";
1383}
1384
1385static int dn_dev_seq_show(struct seq_file *seq, void *v)
1386{
1387        if (v == SEQ_START_TOKEN)
1388                seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1389        else {
1390                struct net_device *dev = v;
1391                char peer_buf[DN_ASCBUF_LEN];
1392                char router_buf[DN_ASCBUF_LEN];
1393                struct dn_dev *dn_db = dev->dn_ptr;
1394
1395                seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1396                                "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1397                                dev->name ? dev->name : "???",
1398                                dn_type2asc(dn_db->parms.mode),
1399                                0, 0,
1400                                dn_db->t3, dn_db->parms.t3,
1401                                mtu2blksize(dev),
1402                                dn_db->parms.priority,
1403                                dn_db->parms.state, dn_db->parms.name,
1404                                dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1405                                dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1406        }
1407        return 0;
1408}
1409
1410static const struct seq_operations dn_dev_seq_ops = {
1411        .start  = dn_dev_seq_start,
1412        .next   = dn_dev_seq_next,
1413        .stop   = dn_dev_seq_stop,
1414        .show   = dn_dev_seq_show,
1415};
1416
1417static int dn_dev_seq_open(struct inode *inode, struct file *file)
1418{
1419        return seq_open(file, &dn_dev_seq_ops);
1420}
1421
1422static const struct file_operations dn_dev_seq_fops = {
1423        .owner   = THIS_MODULE,
1424        .open    = dn_dev_seq_open,
1425        .read    = seq_read,
1426        .llseek  = seq_lseek,
1427        .release = seq_release,
1428};
1429
1430#endif /* CONFIG_PROC_FS */
1431
1432static int addr[2];
1433module_param_array(addr, int, NULL, 0444);
1434MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1435
1436void __init dn_dev_init(void)
1437{
1438        if (addr[0] > 63 || addr[0] < 0) {
1439                printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1440                return;
1441        }
1442
1443        if (addr[1] > 1023 || addr[1] < 0) {
1444                printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1445                return;
1446        }
1447
1448        decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1449
1450        dn_dev_devices_on();
1451
1452        rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL);
1453        rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL);
1454        rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr);
1455
1456        proc_net_fops_create(&init_net, "decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1457
1458#ifdef CONFIG_SYSCTL
1459        {
1460                int i;
1461                for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1462                        dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1463        }
1464#endif /* CONFIG_SYSCTL */
1465}
1466
1467void __exit dn_dev_cleanup(void)
1468{
1469#ifdef CONFIG_SYSCTL
1470        {
1471                int i;
1472                for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1473                        dn_dev_sysctl_unregister(&dn_dev_list[i]);
1474        }
1475#endif /* CONFIG_SYSCTL */
1476
1477        proc_net_remove(&init_net, "decnet_dev");
1478
1479        dn_dev_devices_off();
1480}
1481