linux/net/decnet/dn_dev.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * DECnet       An implementation of the DECnet protocol suite for the LINUX
   4 *              operating system.  DECnet is implemented using the  BSD Socket
   5 *              interface as the means of communication with the user level.
   6 *
   7 *              DECnet Device Layer
   8 *
   9 * Authors:     Steve Whitehouse <SteveW@ACM.org>
  10 *              Eduardo Marcelo Serrat <emserrat@geocities.com>
  11 *
  12 * Changes:
  13 *          Steve Whitehouse : Devices now see incoming frames so they
  14 *                             can mark on who it came from.
  15 *          Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour
  16 *                             can now have a device specific setup func.
  17 *          Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/
  18 *          Steve Whitehouse : Fixed bug which sometimes killed timer
  19 *          Steve Whitehouse : Multiple ifaddr support
  20 *          Steve Whitehouse : SIOCGIFCONF is now a compile time option
  21 *          Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding
  22 *          Steve Whitehouse : Removed timer1 - it's a user space issue now
  23 *         Patrick Caulfield : Fixed router hello message format
  24 *          Steve Whitehouse : Got rid of constant sizes for blksize for
  25 *                             devices. All mtu based now.
  26 */
  27
  28#include <linux/capability.h>
  29#include <linux/module.h>
  30#include <linux/moduleparam.h>
  31#include <linux/init.h>
  32#include <linux/net.h>
  33#include <linux/netdevice.h>
  34#include <linux/proc_fs.h>
  35#include <linux/seq_file.h>
  36#include <linux/timer.h>
  37#include <linux/string.h>
  38#include <linux/if_addr.h>
  39#include <linux/if_arp.h>
  40#include <linux/if_ether.h>
  41#include <linux/skbuff.h>
  42#include <linux/sysctl.h>
  43#include <linux/notifier.h>
  44#include <linux/slab.h>
  45#include <linux/jiffies.h>
  46#include <linux/uaccess.h>
  47#include <net/net_namespace.h>
  48#include <net/neighbour.h>
  49#include <net/dst.h>
  50#include <net/flow.h>
  51#include <net/fib_rules.h>
  52#include <net/netlink.h>
  53#include <net/dn.h>
  54#include <net/dn_dev.h>
  55#include <net/dn_route.h>
  56#include <net/dn_neigh.h>
  57#include <net/dn_fib.h>
  58
  59#define DN_IFREQ_SIZE (offsetof(struct ifreq, ifr_ifru) + sizeof(struct sockaddr_dn))
  60
  61static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
  62static char dn_rt_all_rt_mcast[ETH_ALEN]  = {0xAB,0x00,0x00,0x03,0x00,0x00};
  63static char dn_hiord[ETH_ALEN]            = {0xAA,0x00,0x04,0x00,0x00,0x00};
  64static unsigned char dn_eco_version[3]    = {0x02,0x00,0x00};
  65
  66extern struct neigh_table dn_neigh_table;
  67
  68/*
  69 * decnet_address is kept in network order.
  70 */
  71__le16 decnet_address = 0;
  72
  73static DEFINE_SPINLOCK(dndev_lock);
  74static struct net_device *decnet_default_device;
  75static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
  76
  77static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
  78static void dn_dev_delete(struct net_device *dev);
  79static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa);
  80
  81static int dn_eth_up(struct net_device *);
  82static void dn_eth_down(struct net_device *);
  83static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  84static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  85
  86static struct dn_dev_parms dn_dev_list[] =  {
  87{
  88        .type =         ARPHRD_ETHER, /* Ethernet */
  89        .mode =         DN_DEV_BCAST,
  90        .state =        DN_DEV_S_RU,
  91        .t2 =           1,
  92        .t3 =           10,
  93        .name =         "ethernet",
  94        .up =           dn_eth_up,
  95        .down =         dn_eth_down,
  96        .timer3 =       dn_send_brd_hello,
  97},
  98{
  99        .type =         ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
 100        .mode =         DN_DEV_BCAST,
 101        .state =        DN_DEV_S_RU,
 102        .t2 =           1,
 103        .t3 =           10,
 104        .name =         "ipgre",
 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        .timer3 =       dn_send_ptp_hello,
 116},
 117#endif
 118#if 0
 119{
 120        .type =         ARPHRD_PPP, /* DECnet over PPP */
 121        .mode =         DN_DEV_BCAST,
 122        .state =        DN_DEV_S_RU,
 123        .t2 =           1,
 124        .t3 =           10,
 125        .name =         "ppp",
 126        .timer3 =       dn_send_brd_hello,
 127},
 128#endif
 129{
 130        .type =         ARPHRD_DDCMP, /* DECnet over DDCMP */
 131        .mode =         DN_DEV_UCAST,
 132        .state =        DN_DEV_S_DS,
 133        .t2 =           1,
 134        .t3 =           120,
 135        .name =         "ddcmp",
 136        .timer3 =       dn_send_ptp_hello,
 137},
 138{
 139        .type =         ARPHRD_LOOPBACK, /* Loopback interface - always last */
 140        .mode =         DN_DEV_BCAST,
 141        .state =        DN_DEV_S_RU,
 142        .t2 =           1,
 143        .t3 =           10,
 144        .name =         "loopback",
 145        .timer3 =       dn_send_brd_hello,
 146}
 147};
 148
 149#define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)
 150
 151#define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x)
 152
 153#ifdef CONFIG_SYSCTL
 154
 155static int min_t2[] = { 1 };
 156static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
 157static int min_t3[] = { 1 };
 158static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
 159
 160static int min_priority[1];
 161static int max_priority[] = { 127 }; /* From DECnet spec */
 162
 163static int dn_forwarding_proc(struct ctl_table *, int, void *, size_t *,
 164                loff_t *);
 165static struct dn_dev_sysctl_table {
 166        struct ctl_table_header *sysctl_header;
 167        struct ctl_table dn_dev_vars[5];
 168} dn_dev_sysctl = {
 169        NULL,
 170        {
 171        {
 172                .procname = "forwarding",
 173                .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
 174                .maxlen = sizeof(int),
 175                .mode = 0644,
 176                .proc_handler = dn_forwarding_proc,
 177        },
 178        {
 179                .procname = "priority",
 180                .data = (void *)DN_DEV_PARMS_OFFSET(priority),
 181                .maxlen = sizeof(int),
 182                .mode = 0644,
 183                .proc_handler = proc_dointvec_minmax,
 184                .extra1 = &min_priority,
 185                .extra2 = &max_priority
 186        },
 187        {
 188                .procname = "t2",
 189                .data = (void *)DN_DEV_PARMS_OFFSET(t2),
 190                .maxlen = sizeof(int),
 191                .mode = 0644,
 192                .proc_handler = proc_dointvec_minmax,
 193                .extra1 = &min_t2,
 194                .extra2 = &max_t2
 195        },
 196        {
 197                .procname = "t3",
 198                .data = (void *)DN_DEV_PARMS_OFFSET(t3),
 199                .maxlen = sizeof(int),
 200                .mode = 0644,
 201                .proc_handler = proc_dointvec_minmax,
 202                .extra1 = &min_t3,
 203                .extra2 = &max_t3
 204        },
 205        { }
 206        },
 207};
 208
 209static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 210{
 211        struct dn_dev_sysctl_table *t;
 212        int i;
 213
 214        char path[sizeof("net/decnet/conf/") + IFNAMSIZ];
 215
 216        t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
 217        if (t == NULL)
 218                return;
 219
 220        for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
 221                long offset = (long)t->dn_dev_vars[i].data;
 222                t->dn_dev_vars[i].data = ((char *)parms) + offset;
 223        }
 224
 225        snprintf(path, sizeof(path), "net/decnet/conf/%s",
 226                dev? dev->name : parms->name);
 227
 228        t->dn_dev_vars[0].extra1 = (void *)dev;
 229
 230        t->sysctl_header = register_net_sysctl(&init_net, path, t->dn_dev_vars);
 231        if (t->sysctl_header == NULL)
 232                kfree(t);
 233        else
 234                parms->sysctl = t;
 235}
 236
 237static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 238{
 239        if (parms->sysctl) {
 240                struct dn_dev_sysctl_table *t = parms->sysctl;
 241                parms->sysctl = NULL;
 242                unregister_net_sysctl_table(t->sysctl_header);
 243                kfree(t);
 244        }
 245}
 246
 247static int dn_forwarding_proc(struct ctl_table *table, int write,
 248                void *buffer, size_t *lenp, loff_t *ppos)
 249{
 250#ifdef CONFIG_DECNET_ROUTER
 251        struct net_device *dev = table->extra1;
 252        struct dn_dev *dn_db;
 253        int err;
 254        int tmp, old;
 255
 256        if (table->extra1 == NULL)
 257                return -EINVAL;
 258
 259        dn_db = rcu_dereference_raw(dev->dn_ptr);
 260        old = dn_db->parms.forwarding;
 261
 262        err = proc_dointvec(table, write, buffer, lenp, ppos);
 263
 264        if ((err >= 0) && write) {
 265                if (dn_db->parms.forwarding < 0)
 266                        dn_db->parms.forwarding = 0;
 267                if (dn_db->parms.forwarding > 2)
 268                        dn_db->parms.forwarding = 2;
 269                /*
 270                 * What an ugly hack this is... its works, just. It
 271                 * would be nice if sysctl/proc were just that little
 272                 * bit more flexible so I don't have to write a special
 273                 * routine, or suffer hacks like this - SJW
 274                 */
 275                tmp = dn_db->parms.forwarding;
 276                dn_db->parms.forwarding = old;
 277                if (dn_db->parms.down)
 278                        dn_db->parms.down(dev);
 279                dn_db->parms.forwarding = tmp;
 280                if (dn_db->parms.up)
 281                        dn_db->parms.up(dev);
 282        }
 283
 284        return err;
 285#else
 286        return -EINVAL;
 287#endif
 288}
 289
 290#else /* CONFIG_SYSCTL */
 291static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 292{
 293}
 294static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 295{
 296}
 297
 298#endif /* CONFIG_SYSCTL */
 299
 300static inline __u16 mtu2blksize(struct net_device *dev)
 301{
 302        u32 blksize = dev->mtu;
 303        if (blksize > 0xffff)
 304                blksize = 0xffff;
 305
 306        if (dev->type == ARPHRD_ETHER ||
 307            dev->type == ARPHRD_PPP ||
 308            dev->type == ARPHRD_IPGRE ||
 309            dev->type == ARPHRD_LOOPBACK)
 310                blksize -= 2;
 311
 312        return (__u16)blksize;
 313}
 314
 315static struct dn_ifaddr *dn_dev_alloc_ifa(void)
 316{
 317        struct dn_ifaddr *ifa;
 318
 319        ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
 320
 321        return ifa;
 322}
 323
 324static void dn_dev_free_ifa(struct dn_ifaddr *ifa)
 325{
 326        kfree_rcu(ifa, rcu);
 327}
 328
 329static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr __rcu **ifap, int destroy)
 330{
 331        struct dn_ifaddr *ifa1 = rtnl_dereference(*ifap);
 332        unsigned char mac_addr[6];
 333        struct net_device *dev = dn_db->dev;
 334
 335        ASSERT_RTNL();
 336
 337        *ifap = ifa1->ifa_next;
 338
 339        if (dn_db->dev->type == ARPHRD_ETHER) {
 340                if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
 341                        dn_dn2eth(mac_addr, ifa1->ifa_local);
 342                        dev_mc_del(dev, mac_addr);
 343                }
 344        }
 345
 346        dn_ifaddr_notify(RTM_DELADDR, ifa1);
 347        blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
 348        if (destroy) {
 349                dn_dev_free_ifa(ifa1);
 350
 351                if (dn_db->ifa_list == NULL)
 352                        dn_dev_delete(dn_db->dev);
 353        }
 354}
 355
 356static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 357{
 358        struct net_device *dev = dn_db->dev;
 359        struct dn_ifaddr *ifa1;
 360        unsigned char mac_addr[6];
 361
 362        ASSERT_RTNL();
 363
 364        /* Check for duplicates */
 365        for (ifa1 = rtnl_dereference(dn_db->ifa_list);
 366             ifa1 != NULL;
 367             ifa1 = rtnl_dereference(ifa1->ifa_next)) {
 368                if (ifa1->ifa_local == ifa->ifa_local)
 369                        return -EEXIST;
 370        }
 371
 372        if (dev->type == ARPHRD_ETHER) {
 373                if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
 374                        dn_dn2eth(mac_addr, ifa->ifa_local);
 375                        dev_mc_add(dev, mac_addr);
 376                }
 377        }
 378
 379        ifa->ifa_next = dn_db->ifa_list;
 380        rcu_assign_pointer(dn_db->ifa_list, ifa);
 381
 382        dn_ifaddr_notify(RTM_NEWADDR, ifa);
 383        blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
 384
 385        return 0;
 386}
 387
 388static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
 389{
 390        struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
 391        int rv;
 392
 393        if (dn_db == NULL) {
 394                int err;
 395                dn_db = dn_dev_create(dev, &err);
 396                if (dn_db == NULL)
 397                        return err;
 398        }
 399
 400        ifa->ifa_dev = dn_db;
 401
 402        if (dev->flags & IFF_LOOPBACK)
 403                ifa->ifa_scope = RT_SCOPE_HOST;
 404
 405        rv = dn_dev_insert_ifa(dn_db, ifa);
 406        if (rv)
 407                dn_dev_free_ifa(ifa);
 408        return rv;
 409}
 410
 411
 412int dn_dev_ioctl(unsigned int cmd, void __user *arg)
 413{
 414        char buffer[DN_IFREQ_SIZE];
 415        struct ifreq *ifr = (struct ifreq *)buffer;
 416        struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
 417        struct dn_dev *dn_db;
 418        struct net_device *dev;
 419        struct dn_ifaddr *ifa = NULL;
 420        struct dn_ifaddr __rcu **ifap = NULL;
 421        int ret = 0;
 422
 423        if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
 424                return -EFAULT;
 425        ifr->ifr_name[IFNAMSIZ-1] = 0;
 426
 427        dev_load(&init_net, ifr->ifr_name);
 428
 429        switch (cmd) {
 430        case SIOCGIFADDR:
 431                break;
 432        case SIOCSIFADDR:
 433                if (!capable(CAP_NET_ADMIN))
 434                        return -EACCES;
 435                if (sdn->sdn_family != AF_DECnet)
 436                        return -EINVAL;
 437                break;
 438        default:
 439                return -EINVAL;
 440        }
 441
 442        rtnl_lock();
 443
 444        if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
 445                ret = -ENODEV;
 446                goto done;
 447        }
 448
 449        if ((dn_db = rtnl_dereference(dev->dn_ptr)) != NULL) {
 450                for (ifap = &dn_db->ifa_list;
 451                     (ifa = rtnl_dereference(*ifap)) != NULL;
 452                     ifap = &ifa->ifa_next)
 453                        if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
 454                                break;
 455        }
 456
 457        if (ifa == NULL && cmd != SIOCSIFADDR) {
 458                ret = -EADDRNOTAVAIL;
 459                goto done;
 460        }
 461
 462        switch (cmd) {
 463        case SIOCGIFADDR:
 464                *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
 465                if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
 466                        ret = -EFAULT;
 467                break;
 468
 469        case SIOCSIFADDR:
 470                if (!ifa) {
 471                        if ((ifa = dn_dev_alloc_ifa()) == NULL) {
 472                                ret = -ENOBUFS;
 473                                break;
 474                        }
 475                        memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 476                } else {
 477                        if (ifa->ifa_local == dn_saddr2dn(sdn))
 478                                break;
 479                        dn_dev_del_ifa(dn_db, ifap, 0);
 480                }
 481
 482                ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
 483
 484                ret = dn_dev_set_ifa(dev, ifa);
 485        }
 486done:
 487        rtnl_unlock();
 488
 489        return ret;
 490}
 491
 492struct net_device *dn_dev_get_default(void)
 493{
 494        struct net_device *dev;
 495
 496        spin_lock(&dndev_lock);
 497        dev = decnet_default_device;
 498        if (dev) {
 499                if (dev->dn_ptr)
 500                        dev_hold(dev);
 501                else
 502                        dev = NULL;
 503        }
 504        spin_unlock(&dndev_lock);
 505
 506        return dev;
 507}
 508
 509int dn_dev_set_default(struct net_device *dev, int force)
 510{
 511        struct net_device *old = NULL;
 512        int rv = -EBUSY;
 513        if (!dev->dn_ptr)
 514                return -ENODEV;
 515
 516        spin_lock(&dndev_lock);
 517        if (force || decnet_default_device == NULL) {
 518                old = decnet_default_device;
 519                decnet_default_device = dev;
 520                rv = 0;
 521        }
 522        spin_unlock(&dndev_lock);
 523
 524        if (old)
 525                dev_put(old);
 526        return rv;
 527}
 528
 529static void dn_dev_check_default(struct net_device *dev)
 530{
 531        spin_lock(&dndev_lock);
 532        if (dev == decnet_default_device) {
 533                decnet_default_device = NULL;
 534        } else {
 535                dev = NULL;
 536        }
 537        spin_unlock(&dndev_lock);
 538
 539        if (dev)
 540                dev_put(dev);
 541}
 542
 543/*
 544 * Called with RTNL
 545 */
 546static struct dn_dev *dn_dev_by_index(int ifindex)
 547{
 548        struct net_device *dev;
 549        struct dn_dev *dn_dev = NULL;
 550
 551        dev = __dev_get_by_index(&init_net, ifindex);
 552        if (dev)
 553                dn_dev = rtnl_dereference(dev->dn_ptr);
 554
 555        return dn_dev;
 556}
 557
 558static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
 559        [IFA_ADDRESS]           = { .type = NLA_U16 },
 560        [IFA_LOCAL]             = { .type = NLA_U16 },
 561        [IFA_LABEL]             = { .type = NLA_STRING,
 562                                    .len = IFNAMSIZ - 1 },
 563        [IFA_FLAGS]             = { .type = NLA_U32 },
 564};
 565
 566static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
 567                         struct netlink_ext_ack *extack)
 568{
 569        struct net *net = sock_net(skb->sk);
 570        struct nlattr *tb[IFA_MAX+1];
 571        struct dn_dev *dn_db;
 572        struct ifaddrmsg *ifm;
 573        struct dn_ifaddr *ifa;
 574        struct dn_ifaddr __rcu **ifap;
 575        int err = -EINVAL;
 576
 577        if (!netlink_capable(skb, CAP_NET_ADMIN))
 578                return -EPERM;
 579
 580        if (!net_eq(net, &init_net))
 581                goto errout;
 582
 583        err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
 584                                     dn_ifa_policy, extack);
 585        if (err < 0)
 586                goto errout;
 587
 588        err = -ENODEV;
 589        ifm = nlmsg_data(nlh);
 590        if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
 591                goto errout;
 592
 593        err = -EADDRNOTAVAIL;
 594        for (ifap = &dn_db->ifa_list;
 595             (ifa = rtnl_dereference(*ifap)) != NULL;
 596             ifap = &ifa->ifa_next) {
 597                if (tb[IFA_LOCAL] &&
 598                    nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
 599                        continue;
 600
 601                if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
 602                        continue;
 603
 604                dn_dev_del_ifa(dn_db, ifap, 1);
 605                return 0;
 606        }
 607
 608errout:
 609        return err;
 610}
 611
 612static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
 613                         struct netlink_ext_ack *extack)
 614{
 615        struct net *net = sock_net(skb->sk);
 616        struct nlattr *tb[IFA_MAX+1];
 617        struct net_device *dev;
 618        struct dn_dev *dn_db;
 619        struct ifaddrmsg *ifm;
 620        struct dn_ifaddr *ifa;
 621        int err;
 622
 623        if (!netlink_capable(skb, CAP_NET_ADMIN))
 624                return -EPERM;
 625
 626        if (!net_eq(net, &init_net))
 627                return -EINVAL;
 628
 629        err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
 630                                     dn_ifa_policy, extack);
 631        if (err < 0)
 632                return err;
 633
 634        if (tb[IFA_LOCAL] == NULL)
 635                return -EINVAL;
 636
 637        ifm = nlmsg_data(nlh);
 638        if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
 639                return -ENODEV;
 640
 641        if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL) {
 642                dn_db = dn_dev_create(dev, &err);
 643                if (!dn_db)
 644                        return err;
 645        }
 646
 647        if ((ifa = dn_dev_alloc_ifa()) == NULL)
 648                return -ENOBUFS;
 649
 650        if (tb[IFA_ADDRESS] == NULL)
 651                tb[IFA_ADDRESS] = tb[IFA_LOCAL];
 652
 653        ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
 654        ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
 655        ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
 656                                         ifm->ifa_flags;
 657        ifa->ifa_scope = ifm->ifa_scope;
 658        ifa->ifa_dev = dn_db;
 659
 660        if (tb[IFA_LABEL])
 661                nla_strscpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
 662        else
 663                memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 664
 665        err = dn_dev_insert_ifa(dn_db, ifa);
 666        if (err)
 667                dn_dev_free_ifa(ifa);
 668
 669        return err;
 670}
 671
 672static inline size_t dn_ifaddr_nlmsg_size(void)
 673{
 674        return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
 675               + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
 676               + nla_total_size(2) /* IFA_ADDRESS */
 677               + nla_total_size(2) /* IFA_LOCAL */
 678               + nla_total_size(4); /* IFA_FLAGS */
 679}
 680
 681static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
 682                             u32 portid, u32 seq, int event, unsigned int flags)
 683{
 684        struct ifaddrmsg *ifm;
 685        struct nlmsghdr *nlh;
 686        u32 ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
 687
 688        nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
 689        if (nlh == NULL)
 690                return -EMSGSIZE;
 691
 692        ifm = nlmsg_data(nlh);
 693        ifm->ifa_family = AF_DECnet;
 694        ifm->ifa_prefixlen = 16;
 695        ifm->ifa_flags = ifa_flags;
 696        ifm->ifa_scope = ifa->ifa_scope;
 697        ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
 698
 699        if ((ifa->ifa_address &&
 700             nla_put_le16(skb, IFA_ADDRESS, ifa->ifa_address)) ||
 701            (ifa->ifa_local &&
 702             nla_put_le16(skb, IFA_LOCAL, ifa->ifa_local)) ||
 703            (ifa->ifa_label[0] &&
 704             nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
 705             nla_put_u32(skb, IFA_FLAGS, ifa_flags))
 706                goto nla_put_failure;
 707        nlmsg_end(skb, nlh);
 708        return 0;
 709
 710nla_put_failure:
 711        nlmsg_cancel(skb, nlh);
 712        return -EMSGSIZE;
 713}
 714
 715static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
 716{
 717        struct sk_buff *skb;
 718        int err = -ENOBUFS;
 719
 720        skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
 721        if (skb == NULL)
 722                goto errout;
 723
 724        err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
 725        if (err < 0) {
 726                /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
 727                WARN_ON(err == -EMSGSIZE);
 728                kfree_skb(skb);
 729                goto errout;
 730        }
 731        rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
 732        return;
 733errout:
 734        if (err < 0)
 735                rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
 736}
 737
 738static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
 739{
 740        struct net *net = sock_net(skb->sk);
 741        int idx, dn_idx = 0, skip_ndevs, skip_naddr;
 742        struct net_device *dev;
 743        struct dn_dev *dn_db;
 744        struct dn_ifaddr *ifa;
 745
 746        if (!net_eq(net, &init_net))
 747                return 0;
 748
 749        skip_ndevs = cb->args[0];
 750        skip_naddr = cb->args[1];
 751
 752        idx = 0;
 753        rcu_read_lock();
 754        for_each_netdev_rcu(&init_net, dev) {
 755                if (idx < skip_ndevs)
 756                        goto cont;
 757                else if (idx > skip_ndevs) {
 758                        /* Only skip over addresses for first dev dumped
 759                         * in this iteration (idx == skip_ndevs) */
 760                        skip_naddr = 0;
 761                }
 762
 763                if ((dn_db = rcu_dereference(dev->dn_ptr)) == NULL)
 764                        goto cont;
 765
 766                for (ifa = rcu_dereference(dn_db->ifa_list), dn_idx = 0; ifa;
 767                     ifa = rcu_dereference(ifa->ifa_next), dn_idx++) {
 768                        if (dn_idx < skip_naddr)
 769                                continue;
 770
 771                        if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).portid,
 772                                              cb->nlh->nlmsg_seq, RTM_NEWADDR,
 773                                              NLM_F_MULTI) < 0)
 774                                goto done;
 775                }
 776cont:
 777                idx++;
 778        }
 779done:
 780        rcu_read_unlock();
 781        cb->args[0] = idx;
 782        cb->args[1] = dn_idx;
 783
 784        return skb->len;
 785}
 786
 787static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
 788{
 789        struct dn_dev *dn_db;
 790        struct dn_ifaddr *ifa;
 791        int rv = -ENODEV;
 792
 793        rcu_read_lock();
 794        dn_db = rcu_dereference(dev->dn_ptr);
 795        if (dn_db == NULL)
 796                goto out;
 797
 798        ifa = rcu_dereference(dn_db->ifa_list);
 799        if (ifa != NULL) {
 800                *addr = ifa->ifa_local;
 801                rv = 0;
 802        }
 803out:
 804        rcu_read_unlock();
 805        return rv;
 806}
 807
 808/*
 809 * Find a default address to bind to.
 810 *
 811 * This is one of those areas where the initial VMS concepts don't really
 812 * map onto the Linux concepts, and since we introduced multiple addresses
 813 * per interface we have to cope with slightly odd ways of finding out what
 814 * "our address" really is. Mostly it's not a problem; for this we just guess
 815 * a sensible default. Eventually the routing code will take care of all the
 816 * nasties for us I hope.
 817 */
 818int dn_dev_bind_default(__le16 *addr)
 819{
 820        struct net_device *dev;
 821        int rv;
 822        dev = dn_dev_get_default();
 823last_chance:
 824        if (dev) {
 825                rv = dn_dev_get_first(dev, addr);
 826                dev_put(dev);
 827                if (rv == 0 || dev == init_net.loopback_dev)
 828                        return rv;
 829        }
 830        dev = init_net.loopback_dev;
 831        dev_hold(dev);
 832        goto last_chance;
 833}
 834
 835static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 836{
 837        struct endnode_hello_message *msg;
 838        struct sk_buff *skb = NULL;
 839        __le16 *pktlen;
 840        struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
 841
 842        if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
 843                return;
 844
 845        skb->dev = dev;
 846
 847        msg = skb_put(skb, sizeof(*msg));
 848
 849        msg->msgflg  = 0x0D;
 850        memcpy(msg->tiver, dn_eco_version, 3);
 851        dn_dn2eth(msg->id, ifa->ifa_local);
 852        msg->iinfo   = DN_RT_INFO_ENDN;
 853        msg->blksize = cpu_to_le16(mtu2blksize(dev));
 854        msg->area    = 0x00;
 855        memset(msg->seed, 0, 8);
 856        memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
 857
 858        if (dn_db->router) {
 859                struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 860                dn_dn2eth(msg->neighbor, dn->addr);
 861        }
 862
 863        msg->timer   = cpu_to_le16((unsigned short)dn_db->parms.t3);
 864        msg->mpd     = 0x00;
 865        msg->datalen = 0x02;
 866        memset(msg->data, 0xAA, 2);
 867
 868        pktlen = skb_push(skb, 2);
 869        *pktlen = cpu_to_le16(skb->len - 2);
 870
 871        skb_reset_network_header(skb);
 872
 873        dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
 874}
 875
 876
 877#define DRDELAY (5 * HZ)
 878
 879static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 880{
 881        /* First check time since device went up */
 882        if (time_before(jiffies, dn_db->uptime + DRDELAY))
 883                return 0;
 884
 885        /* If there is no router, then yes... */
 886        if (!dn_db->router)
 887                return 1;
 888
 889        /* otherwise only if we have a higher priority or.. */
 890        if (dn->priority < dn_db->parms.priority)
 891                return 1;
 892
 893        /* if we have equal priority and a higher node number */
 894        if (dn->priority != dn_db->parms.priority)
 895                return 0;
 896
 897        if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
 898                return 1;
 899
 900        return 0;
 901}
 902
 903static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 904{
 905        int n;
 906        struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
 907        struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 908        struct sk_buff *skb;
 909        size_t size;
 910        unsigned char *ptr;
 911        unsigned char *i1, *i2;
 912        __le16 *pktlen;
 913        char *src;
 914
 915        if (mtu2blksize(dev) < (26 + 7))
 916                return;
 917
 918        n = mtu2blksize(dev) - 26;
 919        n /= 7;
 920
 921        if (n > 32)
 922                n = 32;
 923
 924        size = 2 + 26 + 7 * n;
 925
 926        if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
 927                return;
 928
 929        skb->dev = dev;
 930        ptr = skb_put(skb, size);
 931
 932        *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
 933        *ptr++ = 2; /* ECO */
 934        *ptr++ = 0;
 935        *ptr++ = 0;
 936        dn_dn2eth(ptr, ifa->ifa_local);
 937        src = ptr;
 938        ptr += ETH_ALEN;
 939        *ptr++ = dn_db->parms.forwarding == 1 ?
 940                        DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
 941        *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
 942        ptr += 2;
 943        *ptr++ = dn_db->parms.priority; /* Priority */
 944        *ptr++ = 0; /* Area: Reserved */
 945        *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
 946        ptr += 2;
 947        *ptr++ = 0; /* MPD: Reserved */
 948        i1 = ptr++;
 949        memset(ptr, 0, 7); /* Name: Reserved */
 950        ptr += 7;
 951        i2 = ptr++;
 952
 953        n = dn_neigh_elist(dev, ptr, n);
 954
 955        *i2 = 7 * n;
 956        *i1 = 8 + *i2;
 957
 958        skb_trim(skb, (27 + *i2));
 959
 960        pktlen = skb_push(skb, 2);
 961        *pktlen = cpu_to_le16(skb->len - 2);
 962
 963        skb_reset_network_header(skb);
 964
 965        if (dn_am_i_a_router(dn, dn_db, ifa)) {
 966                struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
 967                if (skb2) {
 968                        dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
 969                }
 970        }
 971
 972        dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
 973}
 974
 975static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 976{
 977        struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
 978
 979        if (dn_db->parms.forwarding == 0)
 980                dn_send_endnode_hello(dev, ifa);
 981        else
 982                dn_send_router_hello(dev, ifa);
 983}
 984
 985static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 986{
 987        int tdlen = 16;
 988        int size = dev->hard_header_len + 2 + 4 + tdlen;
 989        struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
 990        int i;
 991        unsigned char *ptr;
 992        char src[ETH_ALEN];
 993
 994        if (skb == NULL)
 995                return ;
 996
 997        skb->dev = dev;
 998        skb_push(skb, dev->hard_header_len);
 999        ptr = skb_put(skb, 2 + 4 + tdlen);
1000
1001        *ptr++ = DN_RT_PKT_HELO;
1002        *((__le16 *)ptr) = ifa->ifa_local;
1003        ptr += 2;
1004        *ptr++ = tdlen;
1005
1006        for(i = 0; i < tdlen; i++)
1007                *ptr++ = 0252;
1008
1009        dn_dn2eth(src, ifa->ifa_local);
1010        dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1011}
1012
1013static int dn_eth_up(struct net_device *dev)
1014{
1015        struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1016
1017        if (dn_db->parms.forwarding == 0)
1018                dev_mc_add(dev, dn_rt_all_end_mcast);
1019        else
1020                dev_mc_add(dev, dn_rt_all_rt_mcast);
1021
1022        dn_db->use_long = 1;
1023
1024        return 0;
1025}
1026
1027static void dn_eth_down(struct net_device *dev)
1028{
1029        struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1030
1031        if (dn_db->parms.forwarding == 0)
1032                dev_mc_del(dev, dn_rt_all_end_mcast);
1033        else
1034                dev_mc_del(dev, dn_rt_all_rt_mcast);
1035}
1036
1037static void dn_dev_set_timer(struct net_device *dev);
1038
1039static void dn_dev_timer_func(struct timer_list *t)
1040{
1041        struct dn_dev *dn_db = from_timer(dn_db, t, timer);
1042        struct net_device *dev;
1043        struct dn_ifaddr *ifa;
1044
1045        rcu_read_lock();
1046        dev = dn_db->dev;
1047        if (dn_db->t3 <= dn_db->parms.t2) {
1048                if (dn_db->parms.timer3) {
1049                        for (ifa = rcu_dereference(dn_db->ifa_list);
1050                             ifa;
1051                             ifa = rcu_dereference(ifa->ifa_next)) {
1052                                if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1053                                        dn_db->parms.timer3(dev, ifa);
1054                        }
1055                }
1056                dn_db->t3 = dn_db->parms.t3;
1057        } else {
1058                dn_db->t3 -= dn_db->parms.t2;
1059        }
1060        rcu_read_unlock();
1061        dn_dev_set_timer(dev);
1062}
1063
1064static void dn_dev_set_timer(struct net_device *dev)
1065{
1066        struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1067
1068        if (dn_db->parms.t2 > dn_db->parms.t3)
1069                dn_db->parms.t2 = dn_db->parms.t3;
1070
1071        dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1072
1073        add_timer(&dn_db->timer);
1074}
1075
1076static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1077{
1078        int i;
1079        struct dn_dev_parms *p = dn_dev_list;
1080        struct dn_dev *dn_db;
1081
1082        for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1083                if (p->type == dev->type)
1084                        break;
1085        }
1086
1087        *err = -ENODEV;
1088        if (i == DN_DEV_LIST_SIZE)
1089                return NULL;
1090
1091        *err = -ENOBUFS;
1092        if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1093                return NULL;
1094
1095        memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1096
1097        rcu_assign_pointer(dev->dn_ptr, dn_db);
1098        dn_db->dev = dev;
1099        timer_setup(&dn_db->timer, dn_dev_timer_func, 0);
1100
1101        dn_db->uptime = jiffies;
1102
1103        dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1104        if (!dn_db->neigh_parms) {
1105                RCU_INIT_POINTER(dev->dn_ptr, NULL);
1106                kfree(dn_db);
1107                return NULL;
1108        }
1109
1110        if (dn_db->parms.up) {
1111                if (dn_db->parms.up(dev) < 0) {
1112                        neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1113                        dev->dn_ptr = NULL;
1114                        kfree(dn_db);
1115                        return NULL;
1116                }
1117        }
1118
1119        dn_dev_sysctl_register(dev, &dn_db->parms);
1120
1121        dn_dev_set_timer(dev);
1122
1123        *err = 0;
1124        return dn_db;
1125}
1126
1127
1128/*
1129 * This processes a device up event. We only start up
1130 * the loopback device & ethernet devices with correct
1131 * MAC addresses automatically. Others must be started
1132 * specifically.
1133 *
1134 * FIXME: How should we configure the loopback address ? If we could dispense
1135 * with using decnet_address here and for autobind, it will be one less thing
1136 * for users to worry about setting up.
1137 */
1138
1139void dn_dev_up(struct net_device *dev)
1140{
1141        struct dn_ifaddr *ifa;
1142        __le16 addr = decnet_address;
1143        int maybe_default = 0;
1144        struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1145
1146        if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1147                return;
1148
1149        /*
1150         * Need to ensure that loopback device has a dn_db attached to it
1151         * to allow creation of neighbours against it, even though it might
1152         * not have a local address of its own. Might as well do the same for
1153         * all autoconfigured interfaces.
1154         */
1155        if (dn_db == NULL) {
1156                int err;
1157                dn_db = dn_dev_create(dev, &err);
1158                if (dn_db == NULL)
1159                        return;
1160        }
1161
1162        if (dev->type == ARPHRD_ETHER) {
1163                if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1164                        return;
1165                addr = dn_eth2dn(dev->dev_addr);
1166                maybe_default = 1;
1167        }
1168
1169        if (addr == 0)
1170                return;
1171
1172        if ((ifa = dn_dev_alloc_ifa()) == NULL)
1173                return;
1174
1175        ifa->ifa_local = ifa->ifa_address = addr;
1176        ifa->ifa_flags = 0;
1177        ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1178        strcpy(ifa->ifa_label, dev->name);
1179
1180        dn_dev_set_ifa(dev, ifa);
1181
1182        /*
1183         * Automagically set the default device to the first automatically
1184         * configured ethernet card in the system.
1185         */
1186        if (maybe_default) {
1187                dev_hold(dev);
1188                if (dn_dev_set_default(dev, 0))
1189                        dev_put(dev);
1190        }
1191}
1192
1193static void dn_dev_delete(struct net_device *dev)
1194{
1195        struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1196
1197        if (dn_db == NULL)
1198                return;
1199
1200        del_timer_sync(&dn_db->timer);
1201        dn_dev_sysctl_unregister(&dn_db->parms);
1202        dn_dev_check_default(dev);
1203        neigh_ifdown(&dn_neigh_table, dev);
1204
1205        if (dn_db->parms.down)
1206                dn_db->parms.down(dev);
1207
1208        dev->dn_ptr = NULL;
1209
1210        neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1211        neigh_ifdown(&dn_neigh_table, dev);
1212
1213        if (dn_db->router)
1214                neigh_release(dn_db->router);
1215        if (dn_db->peer)
1216                neigh_release(dn_db->peer);
1217
1218        kfree(dn_db);
1219}
1220
1221void dn_dev_down(struct net_device *dev)
1222{
1223        struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1224        struct dn_ifaddr *ifa;
1225
1226        if (dn_db == NULL)
1227                return;
1228
1229        while ((ifa = rtnl_dereference(dn_db->ifa_list)) != NULL) {
1230                dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1231                dn_dev_free_ifa(ifa);
1232        }
1233
1234        dn_dev_delete(dev);
1235}
1236
1237void dn_dev_init_pkt(struct sk_buff *skb)
1238{
1239}
1240
1241void dn_dev_veri_pkt(struct sk_buff *skb)
1242{
1243}
1244
1245void dn_dev_hello(struct sk_buff *skb)
1246{
1247}
1248
1249void dn_dev_devices_off(void)
1250{
1251        struct net_device *dev;
1252
1253        rtnl_lock();
1254        for_each_netdev(&init_net, dev)
1255                dn_dev_down(dev);
1256        rtnl_unlock();
1257
1258}
1259
1260void dn_dev_devices_on(void)
1261{
1262        struct net_device *dev;
1263
1264        rtnl_lock();
1265        for_each_netdev(&init_net, dev) {
1266                if (dev->flags & IFF_UP)
1267                        dn_dev_up(dev);
1268        }
1269        rtnl_unlock();
1270}
1271
1272int register_dnaddr_notifier(struct notifier_block *nb)
1273{
1274        return blocking_notifier_chain_register(&dnaddr_chain, nb);
1275}
1276
1277int unregister_dnaddr_notifier(struct notifier_block *nb)
1278{
1279        return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1280}
1281
1282#ifdef CONFIG_PROC_FS
1283static inline int is_dn_dev(struct net_device *dev)
1284{
1285        return dev->dn_ptr != NULL;
1286}
1287
1288static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1289        __acquires(RCU)
1290{
1291        int i;
1292        struct net_device *dev;
1293
1294        rcu_read_lock();
1295
1296        if (*pos == 0)
1297                return SEQ_START_TOKEN;
1298
1299        i = 1;
1300        for_each_netdev_rcu(&init_net, dev) {
1301                if (!is_dn_dev(dev))
1302                        continue;
1303
1304                if (i++ == *pos)
1305                        return dev;
1306        }
1307
1308        return NULL;
1309}
1310
1311static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1312{
1313        struct net_device *dev;
1314
1315        ++*pos;
1316
1317        dev = v;
1318        if (v == SEQ_START_TOKEN)
1319                dev = net_device_entry(&init_net.dev_base_head);
1320
1321        for_each_netdev_continue_rcu(&init_net, dev) {
1322                if (!is_dn_dev(dev))
1323                        continue;
1324
1325                return dev;
1326        }
1327
1328        return NULL;
1329}
1330
1331static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1332        __releases(RCU)
1333{
1334        rcu_read_unlock();
1335}
1336
1337static char *dn_type2asc(char type)
1338{
1339        switch (type) {
1340        case DN_DEV_BCAST:
1341                return "B";
1342        case DN_DEV_UCAST:
1343                return "U";
1344        case DN_DEV_MPOINT:
1345                return "M";
1346        }
1347
1348        return "?";
1349}
1350
1351static int dn_dev_seq_show(struct seq_file *seq, void *v)
1352{
1353        if (v == SEQ_START_TOKEN)
1354                seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1355        else {
1356                struct net_device *dev = v;
1357                char peer_buf[DN_ASCBUF_LEN];
1358                char router_buf[DN_ASCBUF_LEN];
1359                struct dn_dev *dn_db = rcu_dereference(dev->dn_ptr);
1360
1361                seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1362                                "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1363                                dev->name,
1364                                dn_type2asc(dn_db->parms.mode),
1365                                0, 0,
1366                                dn_db->t3, dn_db->parms.t3,
1367                                mtu2blksize(dev),
1368                                dn_db->parms.priority,
1369                                dn_db->parms.state, dn_db->parms.name,
1370                                dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1371                                dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1372        }
1373        return 0;
1374}
1375
1376static const struct seq_operations dn_dev_seq_ops = {
1377        .start  = dn_dev_seq_start,
1378        .next   = dn_dev_seq_next,
1379        .stop   = dn_dev_seq_stop,
1380        .show   = dn_dev_seq_show,
1381};
1382#endif /* CONFIG_PROC_FS */
1383
1384static int addr[2];
1385module_param_array(addr, int, NULL, 0444);
1386MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1387
1388void __init dn_dev_init(void)
1389{
1390        if (addr[0] > 63 || addr[0] < 0) {
1391                printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1392                return;
1393        }
1394
1395        if (addr[1] > 1023 || addr[1] < 0) {
1396                printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1397                return;
1398        }
1399
1400        decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1401
1402        dn_dev_devices_on();
1403
1404        rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_NEWADDR,
1405                             dn_nl_newaddr, NULL, 0);
1406        rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_DELADDR,
1407                             dn_nl_deladdr, NULL, 0);
1408        rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_GETADDR,
1409                             NULL, dn_nl_dump_ifaddr, 0);
1410
1411        proc_create_seq("decnet_dev", 0444, init_net.proc_net, &dn_dev_seq_ops);
1412
1413#ifdef CONFIG_SYSCTL
1414        {
1415                int i;
1416                for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1417                        dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1418        }
1419#endif /* CONFIG_SYSCTL */
1420}
1421
1422void __exit dn_dev_cleanup(void)
1423{
1424#ifdef CONFIG_SYSCTL
1425        {
1426                int i;
1427                for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1428                        dn_dev_sysctl_unregister(&dn_dev_list[i]);
1429        }
1430#endif /* CONFIG_SYSCTL */
1431
1432        remove_proc_entry("decnet_dev", init_net.proc_net);
1433
1434        dn_dev_devices_off();
1435}
1436