linux/net/decnet/dn_fib.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 Routing Forwarding Information Base (Glue/Info List)
   7 *
   8 * Author:      Steve Whitehouse <SteveW@ACM.org>
   9 *
  10 *
  11 * Changes:
  12 *              Alexey Kuznetsov : SMP locking changes
  13 *              Steve Whitehouse : Rewrote it... Well to be more correct, I
  14 *                                 copied most of it from the ipv4 fib code.
  15 *              Steve Whitehouse : Updated it in style and fixed a few bugs
  16 *                                 which were fixed in the ipv4 code since
  17 *                                 this code was copied from it.
  18 *
  19 */
  20#include <linux/string.h>
  21#include <linux/net.h>
  22#include <linux/socket.h>
  23#include <linux/slab.h>
  24#include <linux/sockios.h>
  25#include <linux/init.h>
  26#include <linux/skbuff.h>
  27#include <linux/netlink.h>
  28#include <linux/rtnetlink.h>
  29#include <linux/proc_fs.h>
  30#include <linux/netdevice.h>
  31#include <linux/timer.h>
  32#include <linux/spinlock.h>
  33#include <linux/atomic.h>
  34#include <asm/uaccess.h>
  35#include <net/neighbour.h>
  36#include <net/dst.h>
  37#include <net/flow.h>
  38#include <net/fib_rules.h>
  39#include <net/dn.h>
  40#include <net/dn_route.h>
  41#include <net/dn_fib.h>
  42#include <net/dn_neigh.h>
  43#include <net/dn_dev.h>
  44
  45#define RT_MIN_TABLE 1
  46
  47#define for_fib_info() { struct dn_fib_info *fi;\
  48        for(fi = dn_fib_info_list; fi; fi = fi->fib_next)
  49#define endfor_fib_info() }
  50
  51#define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
  52        for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
  53
  54#define change_nexthops(fi) { int nhsel; struct dn_fib_nh *nh;\
  55        for(nhsel = 0, nh = (struct dn_fib_nh *)((fi)->fib_nh); nhsel < (fi)->fib_nhs; nh++, nhsel++)
  56
  57#define endfor_nexthops(fi) }
  58
  59static DEFINE_SPINLOCK(dn_fib_multipath_lock);
  60static struct dn_fib_info *dn_fib_info_list;
  61static DEFINE_SPINLOCK(dn_fib_info_lock);
  62
  63static struct
  64{
  65        int error;
  66        u8 scope;
  67} dn_fib_props[RTN_MAX+1] = {
  68        [RTN_UNSPEC] =      { .error = 0,       .scope = RT_SCOPE_NOWHERE },
  69        [RTN_UNICAST] =     { .error = 0,       .scope = RT_SCOPE_UNIVERSE },
  70        [RTN_LOCAL] =       { .error = 0,       .scope = RT_SCOPE_HOST },
  71        [RTN_BROADCAST] =   { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
  72        [RTN_ANYCAST] =     { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
  73        [RTN_MULTICAST] =   { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
  74        [RTN_BLACKHOLE] =   { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE },
  75        [RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE },
  76        [RTN_PROHIBIT] =    { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE },
  77        [RTN_THROW] =       { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE },
  78        [RTN_NAT] =         { .error = 0,       .scope = RT_SCOPE_NOWHERE },
  79        [RTN_XRESOLVE] =    { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
  80};
  81
  82static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force);
  83static int dn_fib_sync_up(struct net_device *dev);
  84
  85void dn_fib_free_info(struct dn_fib_info *fi)
  86{
  87        if (fi->fib_dead == 0) {
  88                printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n");
  89                return;
  90        }
  91
  92        change_nexthops(fi) {
  93                if (nh->nh_dev)
  94                        dev_put(nh->nh_dev);
  95                nh->nh_dev = NULL;
  96        } endfor_nexthops(fi);
  97        kfree(fi);
  98}
  99
 100void dn_fib_release_info(struct dn_fib_info *fi)
 101{
 102        spin_lock(&dn_fib_info_lock);
 103        if (fi && --fi->fib_treeref == 0) {
 104                if (fi->fib_next)
 105                        fi->fib_next->fib_prev = fi->fib_prev;
 106                if (fi->fib_prev)
 107                        fi->fib_prev->fib_next = fi->fib_next;
 108                if (fi == dn_fib_info_list)
 109                        dn_fib_info_list = fi->fib_next;
 110                fi->fib_dead = 1;
 111                dn_fib_info_put(fi);
 112        }
 113        spin_unlock(&dn_fib_info_lock);
 114}
 115
 116static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi)
 117{
 118        const struct dn_fib_nh *onh = ofi->fib_nh;
 119
 120        for_nexthops(fi) {
 121                if (nh->nh_oif != onh->nh_oif ||
 122                        nh->nh_gw != onh->nh_gw ||
 123                        nh->nh_scope != onh->nh_scope ||
 124                        nh->nh_weight != onh->nh_weight ||
 125                        ((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD))
 126                                return -1;
 127                onh++;
 128        } endfor_nexthops(fi);
 129        return 0;
 130}
 131
 132static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi)
 133{
 134        for_fib_info() {
 135                if (fi->fib_nhs != nfi->fib_nhs)
 136                        continue;
 137                if (nfi->fib_protocol == fi->fib_protocol &&
 138                        nfi->fib_prefsrc == fi->fib_prefsrc &&
 139                        nfi->fib_priority == fi->fib_priority &&
 140                        memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 &&
 141                        ((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 &&
 142                        (nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0))
 143                                return fi;
 144        } endfor_fib_info();
 145        return NULL;
 146}
 147
 148__le16 dn_fib_get_attr16(struct rtattr *attr, int attrlen, int type)
 149{
 150        while(RTA_OK(attr,attrlen)) {
 151                if (attr->rta_type == type)
 152                        return *(__le16*)RTA_DATA(attr);
 153                attr = RTA_NEXT(attr, attrlen);
 154        }
 155
 156        return 0;
 157}
 158
 159static int dn_fib_count_nhs(struct rtattr *rta)
 160{
 161        int nhs = 0;
 162        struct rtnexthop *nhp = RTA_DATA(rta);
 163        int nhlen = RTA_PAYLOAD(rta);
 164
 165        while(nhlen >= (int)sizeof(struct rtnexthop)) {
 166                if ((nhlen -= nhp->rtnh_len) < 0)
 167                        return 0;
 168                nhs++;
 169                nhp = RTNH_NEXT(nhp);
 170        }
 171
 172        return nhs;
 173}
 174
 175static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct rtattr *rta, const struct rtmsg *r)
 176{
 177        struct rtnexthop *nhp = RTA_DATA(rta);
 178        int nhlen = RTA_PAYLOAD(rta);
 179
 180        change_nexthops(fi) {
 181                int attrlen = nhlen - sizeof(struct rtnexthop);
 182                if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
 183                        return -EINVAL;
 184
 185                nh->nh_flags  = (r->rtm_flags&~0xFF) | nhp->rtnh_flags;
 186                nh->nh_oif    = nhp->rtnh_ifindex;
 187                nh->nh_weight = nhp->rtnh_hops + 1;
 188
 189                if (attrlen) {
 190                        nh->nh_gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
 191                }
 192                nhp = RTNH_NEXT(nhp);
 193        } endfor_nexthops(fi);
 194
 195        return 0;
 196}
 197
 198
 199static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh)
 200{
 201        int err;
 202
 203        if (nh->nh_gw) {
 204                struct flowidn fld;
 205                struct dn_fib_res res;
 206
 207                if (nh->nh_flags&RTNH_F_ONLINK) {
 208                        struct net_device *dev;
 209
 210                        if (r->rtm_scope >= RT_SCOPE_LINK)
 211                                return -EINVAL;
 212                        if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST)
 213                                return -EINVAL;
 214                        if ((dev = __dev_get_by_index(&init_net, nh->nh_oif)) == NULL)
 215                                return -ENODEV;
 216                        if (!(dev->flags&IFF_UP))
 217                                return -ENETDOWN;
 218                        nh->nh_dev = dev;
 219                        dev_hold(dev);
 220                        nh->nh_scope = RT_SCOPE_LINK;
 221                        return 0;
 222                }
 223
 224                memset(&fld, 0, sizeof(fld));
 225                fld.daddr = nh->nh_gw;
 226                fld.flowidn_oif = nh->nh_oif;
 227                fld.flowidn_scope = r->rtm_scope + 1;
 228
 229                if (fld.flowidn_scope < RT_SCOPE_LINK)
 230                        fld.flowidn_scope = RT_SCOPE_LINK;
 231
 232                if ((err = dn_fib_lookup(&fld, &res)) != 0)
 233                        return err;
 234
 235                err = -EINVAL;
 236                if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
 237                        goto out;
 238                nh->nh_scope = res.scope;
 239                nh->nh_oif = DN_FIB_RES_OIF(res);
 240                nh->nh_dev = DN_FIB_RES_DEV(res);
 241                if (nh->nh_dev == NULL)
 242                        goto out;
 243                dev_hold(nh->nh_dev);
 244                err = -ENETDOWN;
 245                if (!(nh->nh_dev->flags & IFF_UP))
 246                        goto out;
 247                err = 0;
 248out:
 249                dn_fib_res_put(&res);
 250                return err;
 251        } else {
 252                struct net_device *dev;
 253
 254                if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK))
 255                        return -EINVAL;
 256
 257                dev = __dev_get_by_index(&init_net, nh->nh_oif);
 258                if (dev == NULL || dev->dn_ptr == NULL)
 259                        return -ENODEV;
 260                if (!(dev->flags&IFF_UP))
 261                        return -ENETDOWN;
 262                nh->nh_dev = dev;
 263                dev_hold(nh->nh_dev);
 264                nh->nh_scope = RT_SCOPE_HOST;
 265        }
 266
 267        return 0;
 268}
 269
 270
 271struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct dn_kern_rta *rta, const struct nlmsghdr *nlh, int *errp)
 272{
 273        int err;
 274        struct dn_fib_info *fi = NULL;
 275        struct dn_fib_info *ofi;
 276        int nhs = 1;
 277
 278        if (r->rtm_type > RTN_MAX)
 279                goto err_inval;
 280
 281        if (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
 282                goto err_inval;
 283
 284        if (rta->rta_mp) {
 285                nhs = dn_fib_count_nhs(rta->rta_mp);
 286                if (nhs == 0)
 287                        goto err_inval;
 288        }
 289
 290        fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
 291        err = -ENOBUFS;
 292        if (fi == NULL)
 293                goto failure;
 294
 295        fi->fib_protocol = r->rtm_protocol;
 296        fi->fib_nhs = nhs;
 297        fi->fib_flags = r->rtm_flags;
 298        if (rta->rta_priority)
 299                fi->fib_priority = *rta->rta_priority;
 300        if (rta->rta_mx) {
 301                int attrlen = RTA_PAYLOAD(rta->rta_mx);
 302                struct rtattr *attr = RTA_DATA(rta->rta_mx);
 303
 304                while(RTA_OK(attr, attrlen)) {
 305                        unsigned int flavour = attr->rta_type;
 306
 307                        if (flavour) {
 308                                if (flavour > RTAX_MAX)
 309                                        goto err_inval;
 310                                fi->fib_metrics[flavour-1] = *(unsigned int *)RTA_DATA(attr);
 311                        }
 312                        attr = RTA_NEXT(attr, attrlen);
 313                }
 314        }
 315        if (rta->rta_prefsrc)
 316                memcpy(&fi->fib_prefsrc, rta->rta_prefsrc, 2);
 317
 318        if (rta->rta_mp) {
 319                if ((err = dn_fib_get_nhs(fi, rta->rta_mp, r)) != 0)
 320                        goto failure;
 321                if (rta->rta_oif && fi->fib_nh->nh_oif != *rta->rta_oif)
 322                        goto err_inval;
 323                if (rta->rta_gw && memcmp(&fi->fib_nh->nh_gw, rta->rta_gw, 2))
 324                        goto err_inval;
 325        } else {
 326                struct dn_fib_nh *nh = fi->fib_nh;
 327                if (rta->rta_oif)
 328                        nh->nh_oif = *rta->rta_oif;
 329                if (rta->rta_gw)
 330                        memcpy(&nh->nh_gw, rta->rta_gw, 2);
 331                nh->nh_flags = r->rtm_flags;
 332                nh->nh_weight = 1;
 333        }
 334
 335        if (r->rtm_type == RTN_NAT) {
 336                if (rta->rta_gw == NULL || nhs != 1 || rta->rta_oif)
 337                        goto err_inval;
 338                memcpy(&fi->fib_nh->nh_gw, rta->rta_gw, 2);
 339                goto link_it;
 340        }
 341
 342        if (dn_fib_props[r->rtm_type].error) {
 343                if (rta->rta_gw || rta->rta_oif || rta->rta_mp)
 344                        goto err_inval;
 345                goto link_it;
 346        }
 347
 348        if (r->rtm_scope > RT_SCOPE_HOST)
 349                goto err_inval;
 350
 351        if (r->rtm_scope == RT_SCOPE_HOST) {
 352                struct dn_fib_nh *nh = fi->fib_nh;
 353
 354                /* Local address is added */
 355                if (nhs != 1 || nh->nh_gw)
 356                        goto err_inval;
 357                nh->nh_scope = RT_SCOPE_NOWHERE;
 358                nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif);
 359                err = -ENODEV;
 360                if (nh->nh_dev == NULL)
 361                        goto failure;
 362        } else {
 363                change_nexthops(fi) {
 364                        if ((err = dn_fib_check_nh(r, fi, nh)) != 0)
 365                                goto failure;
 366                } endfor_nexthops(fi)
 367        }
 368
 369        if (fi->fib_prefsrc) {
 370                if (r->rtm_type != RTN_LOCAL || rta->rta_dst == NULL ||
 371                    memcmp(&fi->fib_prefsrc, rta->rta_dst, 2))
 372                        if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
 373                                goto err_inval;
 374        }
 375
 376link_it:
 377        if ((ofi = dn_fib_find_info(fi)) != NULL) {
 378                fi->fib_dead = 1;
 379                dn_fib_free_info(fi);
 380                ofi->fib_treeref++;
 381                return ofi;
 382        }
 383
 384        fi->fib_treeref++;
 385        atomic_inc(&fi->fib_clntref);
 386        spin_lock(&dn_fib_info_lock);
 387        fi->fib_next = dn_fib_info_list;
 388        fi->fib_prev = NULL;
 389        if (dn_fib_info_list)
 390                dn_fib_info_list->fib_prev = fi;
 391        dn_fib_info_list = fi;
 392        spin_unlock(&dn_fib_info_lock);
 393        return fi;
 394
 395err_inval:
 396        err = -EINVAL;
 397
 398failure:
 399        *errp = err;
 400        if (fi) {
 401                fi->fib_dead = 1;
 402                dn_fib_free_info(fi);
 403        }
 404
 405        return NULL;
 406}
 407
 408int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowidn *fld, struct dn_fib_res *res)
 409{
 410        int err = dn_fib_props[type].error;
 411
 412        if (err == 0) {
 413                if (fi->fib_flags & RTNH_F_DEAD)
 414                        return 1;
 415
 416                res->fi = fi;
 417
 418                switch (type) {
 419                case RTN_NAT:
 420                        DN_FIB_RES_RESET(*res);
 421                        atomic_inc(&fi->fib_clntref);
 422                        return 0;
 423                case RTN_UNICAST:
 424                case RTN_LOCAL:
 425                        for_nexthops(fi) {
 426                                if (nh->nh_flags & RTNH_F_DEAD)
 427                                        continue;
 428                                if (!fld->flowidn_oif ||
 429                                    fld->flowidn_oif == nh->nh_oif)
 430                                        break;
 431                        }
 432                        if (nhsel < fi->fib_nhs) {
 433                                res->nh_sel = nhsel;
 434                                atomic_inc(&fi->fib_clntref);
 435                                return 0;
 436                        }
 437                        endfor_nexthops(fi);
 438                        res->fi = NULL;
 439                        return 1;
 440                default:
 441                        net_err_ratelimited("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n",
 442                                            type);
 443                        res->fi = NULL;
 444                        return -EINVAL;
 445                }
 446        }
 447        return err;
 448}
 449
 450void dn_fib_select_multipath(const struct flowidn *fld, struct dn_fib_res *res)
 451{
 452        struct dn_fib_info *fi = res->fi;
 453        int w;
 454
 455        spin_lock_bh(&dn_fib_multipath_lock);
 456        if (fi->fib_power <= 0) {
 457                int power = 0;
 458                change_nexthops(fi) {
 459                        if (!(nh->nh_flags&RTNH_F_DEAD)) {
 460                                power += nh->nh_weight;
 461                                nh->nh_power = nh->nh_weight;
 462                        }
 463                } endfor_nexthops(fi);
 464                fi->fib_power = power;
 465                if (power < 0) {
 466                        spin_unlock_bh(&dn_fib_multipath_lock);
 467                        res->nh_sel = 0;
 468                        return;
 469                }
 470        }
 471
 472        w = jiffies % fi->fib_power;
 473
 474        change_nexthops(fi) {
 475                if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
 476                        if ((w -= nh->nh_power) <= 0) {
 477                                nh->nh_power--;
 478                                fi->fib_power--;
 479                                res->nh_sel = nhsel;
 480                                spin_unlock_bh(&dn_fib_multipath_lock);
 481                                return;
 482                        }
 483                }
 484        } endfor_nexthops(fi);
 485        res->nh_sel = 0;
 486        spin_unlock_bh(&dn_fib_multipath_lock);
 487}
 488
 489
 490static int dn_fib_check_attr(struct rtmsg *r, struct rtattr **rta)
 491{
 492        int i;
 493
 494        for(i = 1; i <= RTA_MAX; i++) {
 495                struct rtattr *attr = rta[i-1];
 496                if (attr) {
 497                        if (RTA_PAYLOAD(attr) < 4 && RTA_PAYLOAD(attr) != 2)
 498                                return -EINVAL;
 499                        if (i != RTA_MULTIPATH && i != RTA_METRICS &&
 500                            i != RTA_TABLE)
 501                                rta[i-1] = (struct rtattr *)RTA_DATA(attr);
 502                }
 503        }
 504
 505        return 0;
 506}
 507
 508static inline u32 rtm_get_table(struct rtattr **rta, u8 table)
 509{
 510        if (rta[RTA_TABLE - 1])
 511                table = nla_get_u32((struct nlattr *) rta[RTA_TABLE - 1]);
 512
 513        return table;
 514}
 515
 516static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 517{
 518        struct net *net = sock_net(skb->sk);
 519        struct dn_fib_table *tb;
 520        struct rtattr **rta = arg;
 521        struct rtmsg *r = NLMSG_DATA(nlh);
 522
 523        if (!net_eq(net, &init_net))
 524                return -EINVAL;
 525
 526        if (dn_fib_check_attr(r, rta))
 527                return -EINVAL;
 528
 529        tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 0);
 530        if (tb)
 531                return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
 532
 533        return -ESRCH;
 534}
 535
 536static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 537{
 538        struct net *net = sock_net(skb->sk);
 539        struct dn_fib_table *tb;
 540        struct rtattr **rta = arg;
 541        struct rtmsg *r = NLMSG_DATA(nlh);
 542
 543        if (!net_eq(net, &init_net))
 544                return -EINVAL;
 545
 546        if (dn_fib_check_attr(r, rta))
 547                return -EINVAL;
 548
 549        tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 1);
 550        if (tb)
 551                return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
 552
 553        return -ENOBUFS;
 554}
 555
 556static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
 557{
 558        struct dn_fib_table *tb;
 559        struct {
 560                struct nlmsghdr nlh;
 561                struct rtmsg rtm;
 562        } req;
 563        struct dn_kern_rta rta;
 564
 565        memset(&req.rtm, 0, sizeof(req.rtm));
 566        memset(&rta, 0, sizeof(rta));
 567
 568        if (type == RTN_UNICAST)
 569                tb = dn_fib_get_table(RT_MIN_TABLE, 1);
 570        else
 571                tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
 572
 573        if (tb == NULL)
 574                return;
 575
 576        req.nlh.nlmsg_len = sizeof(req);
 577        req.nlh.nlmsg_type = cmd;
 578        req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
 579        req.nlh.nlmsg_pid = 0;
 580        req.nlh.nlmsg_seq = 0;
 581
 582        req.rtm.rtm_dst_len = dst_len;
 583        req.rtm.rtm_table = tb->n;
 584        req.rtm.rtm_protocol = RTPROT_KERNEL;
 585        req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
 586        req.rtm.rtm_type = type;
 587
 588        rta.rta_dst = &dst;
 589        rta.rta_prefsrc = &ifa->ifa_local;
 590        rta.rta_oif = &ifa->ifa_dev->dev->ifindex;
 591
 592        if (cmd == RTM_NEWROUTE)
 593                tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL);
 594        else
 595                tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL);
 596}
 597
 598static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
 599{
 600
 601        fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
 602
 603#if 0
 604        if (!(dev->flags&IFF_UP))
 605                return;
 606        /* In the future, we will want to add default routes here */
 607
 608#endif
 609}
 610
 611static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
 612{
 613        int found_it = 0;
 614        struct net_device *dev;
 615        struct dn_dev *dn_db;
 616        struct dn_ifaddr *ifa2;
 617
 618        ASSERT_RTNL();
 619
 620        /* Scan device list */
 621        rcu_read_lock();
 622        for_each_netdev_rcu(&init_net, dev) {
 623                dn_db = rcu_dereference(dev->dn_ptr);
 624                if (dn_db == NULL)
 625                        continue;
 626                for (ifa2 = rcu_dereference(dn_db->ifa_list);
 627                     ifa2 != NULL;
 628                     ifa2 = rcu_dereference(ifa2->ifa_next)) {
 629                        if (ifa2->ifa_local == ifa->ifa_local) {
 630                                found_it = 1;
 631                                break;
 632                        }
 633                }
 634        }
 635        rcu_read_unlock();
 636
 637        if (found_it == 0) {
 638                fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
 639
 640                if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
 641                        if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
 642                                dn_fib_flush();
 643                }
 644        }
 645}
 646
 647static void dn_fib_disable_addr(struct net_device *dev, int force)
 648{
 649        if (dn_fib_sync_down(0, dev, force))
 650                dn_fib_flush();
 651        dn_rt_cache_flush(0);
 652        neigh_ifdown(&dn_neigh_table, dev);
 653}
 654
 655static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
 656{
 657        struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
 658
 659        switch (event) {
 660        case NETDEV_UP:
 661                dn_fib_add_ifaddr(ifa);
 662                dn_fib_sync_up(ifa->ifa_dev->dev);
 663                dn_rt_cache_flush(-1);
 664                break;
 665        case NETDEV_DOWN:
 666                dn_fib_del_ifaddr(ifa);
 667                if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
 668                        dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
 669                } else {
 670                        dn_rt_cache_flush(-1);
 671                }
 672                break;
 673        }
 674        return NOTIFY_DONE;
 675}
 676
 677static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force)
 678{
 679        int ret = 0;
 680        int scope = RT_SCOPE_NOWHERE;
 681
 682        if (force)
 683                scope = -1;
 684
 685        for_fib_info() {
 686                /*
 687                 * This makes no sense for DECnet.... we will almost
 688                 * certainly have more than one local address the same
 689                 * over all our interfaces. It needs thinking about
 690                 * some more.
 691                 */
 692                if (local && fi->fib_prefsrc == local) {
 693                        fi->fib_flags |= RTNH_F_DEAD;
 694                        ret++;
 695                } else if (dev && fi->fib_nhs) {
 696                        int dead = 0;
 697
 698                        change_nexthops(fi) {
 699                                if (nh->nh_flags&RTNH_F_DEAD)
 700                                        dead++;
 701                                else if (nh->nh_dev == dev &&
 702                                                nh->nh_scope != scope) {
 703                                        spin_lock_bh(&dn_fib_multipath_lock);
 704                                        nh->nh_flags |= RTNH_F_DEAD;
 705                                        fi->fib_power -= nh->nh_power;
 706                                        nh->nh_power = 0;
 707                                        spin_unlock_bh(&dn_fib_multipath_lock);
 708                                        dead++;
 709                                }
 710                        } endfor_nexthops(fi)
 711                        if (dead == fi->fib_nhs) {
 712                                fi->fib_flags |= RTNH_F_DEAD;
 713                                ret++;
 714                        }
 715                }
 716        } endfor_fib_info();
 717        return ret;
 718}
 719
 720
 721static int dn_fib_sync_up(struct net_device *dev)
 722{
 723        int ret = 0;
 724
 725        if (!(dev->flags&IFF_UP))
 726                return 0;
 727
 728        for_fib_info() {
 729                int alive = 0;
 730
 731                change_nexthops(fi) {
 732                        if (!(nh->nh_flags&RTNH_F_DEAD)) {
 733                                alive++;
 734                                continue;
 735                        }
 736                        if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
 737                                continue;
 738                        if (nh->nh_dev != dev || dev->dn_ptr == NULL)
 739                                continue;
 740                        alive++;
 741                        spin_lock_bh(&dn_fib_multipath_lock);
 742                        nh->nh_power = 0;
 743                        nh->nh_flags &= ~RTNH_F_DEAD;
 744                        spin_unlock_bh(&dn_fib_multipath_lock);
 745                } endfor_nexthops(fi);
 746
 747                if (alive > 0) {
 748                        fi->fib_flags &= ~RTNH_F_DEAD;
 749                        ret++;
 750                }
 751        } endfor_fib_info();
 752        return ret;
 753}
 754
 755static struct notifier_block dn_fib_dnaddr_notifier = {
 756        .notifier_call = dn_fib_dnaddr_event,
 757};
 758
 759void __exit dn_fib_cleanup(void)
 760{
 761        dn_fib_table_cleanup();
 762        dn_fib_rules_cleanup();
 763
 764        unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
 765}
 766
 767
 768void __init dn_fib_init(void)
 769{
 770        dn_fib_table_init();
 771        dn_fib_rules_init();
 772
 773        register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
 774
 775        rtnl_register(PF_DECnet, RTM_NEWROUTE, dn_fib_rtm_newroute, NULL, NULL);
 776        rtnl_register(PF_DECnet, RTM_DELROUTE, dn_fib_rtm_delroute, NULL, NULL);
 777}
 778
 779
 780
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