net/decnet/dn_fib.c

   1 /*
   2  * DECnet       An implementation of the DECnet protocol suite for the LINUX
   3  *              operating system.  DECnet is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              DECnet 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/sockios.h>
  24 #include <linux/init.h>
  25 #include <linux/skbuff.h>
  26 #include <linux/netlink.h>
  27 #include <linux/rtnetlink.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/timer.h>
  31 #include <linux/spinlock.h>
  32 #include <asm/atomic.h>
  33 #include <asm/uaccess.h>
  34 #include <net/neighbour.h>
  35 #include <net/dst.h>
  36 #include <net/flow.h>
  37 #include <net/fib_rules.h>
  38 #include <net/dn.h>
  39 #include <net/dn_route.h>
  40 #include <net/dn_fib.h>
  41 #include <net/dn_neigh.h>
  42 #include <net/dn_dev.h>
  43
  44 #define RT_MIN_TABLE 1
  45
  46 #define for_fib_info() { struct dn_fib_info *fi;\
  47         for(fi = dn_fib_info_list; fi; fi = fi->fib_next)
  48 #define endfor_fib_info() }
  49
  50 #define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
  51         for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
  52
  53 #define change_nexthops(fi) { int nhsel; struct dn_fib_nh *nh;\
  54         for(nhsel = 0, nh = (struct dn_fib_nh *)((fi)->fib_nh); nhsel < (fi)->fib_nhs; nh++, nhsel++)
  55
  56 #define endfor_nexthops(fi) }
  57
  58 static DEFINE_SPINLOCK(dn_fib_multipath_lock);
  59 static struct dn_fib_info *dn_fib_info_list;
  60 static DEFINE_SPINLOCK(dn_fib_info_lock);
  61
  62 static struct
  63 {
  64         int error;
  65         u8 scope;
  66 } dn_fib_props[RTN_MAX+1] = {
  67         [RTN_UNSPEC] =      { .error = 0,       .scope = RT_SCOPE_NOWHERE },
  68         [RTN_UNICAST] =     { .error = 0,       .scope = RT_SCOPE_UNIVERSE },
  69         [RTN_LOCAL] =       { .error = 0,       .scope = RT_SCOPE_HOST },
  70         [RTN_BROADCAST] =   { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
  71         [RTN_ANYCAST] =     { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
  72         [RTN_MULTICAST] =   { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
  73         [RTN_BLACKHOLE] =   { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE },
  74         [RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE },
  75         [RTN_PROHIBIT] =    { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE },
  76         [RTN_THROW] =       { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE },
  77         [RTN_NAT] =         { .error = 0,       .scope = RT_SCOPE_NOWHERE },
  78         [RTN_XRESOLVE] =    { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
  79 };
  80
  81 static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force);
  82 static int dn_fib_sync_up(struct net_device *dev);
  83
  84 void dn_fib_free_info(struct dn_fib_info *fi)
  85 {
  86         if (fi->fib_dead == 0) {
  87                 printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n");
  88                 return;
  89         }
  90
  91         change_nexthops(fi) {
  92                 if (nh->nh_dev)
  93                         dev_put(nh->nh_dev);
  94                 nh->nh_dev = NULL;
  95         } endfor_nexthops(fi);
  96         kfree(fi);
  97 }
  98
  99 void dn_fib_release_info(struct dn_fib_info *fi)
 100 {
 101         spin_lock(&dn_fib_info_lock);
 102         if (fi && --fi->fib_treeref == 0) {
 103                 if (fi->fib_next)
 104                         fi->fib_next->fib_prev = fi->fib_prev;
 105                 if (fi->fib_prev)
 106                         fi->fib_prev->fib_next = fi->fib_next;
 107                 if (fi == dn_fib_info_list)
 108                         dn_fib_info_list = fi->fib_next;
 109                 fi->fib_dead = 1;
 110                 dn_fib_info_put(fi);
 111         }
 112         spin_unlock(&dn_fib_info_lock);
 113 }
 114
 115 static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi)
 116 {
 117         const struct dn_fib_nh *onh = ofi->fib_nh;
 118
 119         for_nexthops(fi) {
 120                 if (nh->nh_oif != onh->nh_oif ||
 121                         nh->nh_gw != onh->nh_gw ||
 122                         nh->nh_scope != onh->nh_scope ||
 123                         nh->nh_weight != onh->nh_weight ||
 124                         ((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD))
 125                                 return -1;
 126                 onh++;
 127         } endfor_nexthops(fi);
 128         return 0;
 129 }
 130
 131 static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi)
 132 {
 133         for_fib_info() {
 134                 if (fi->fib_nhs != nfi->fib_nhs)
 135                         continue;
 136                 if (nfi->fib_protocol == fi->fib_protocol &&
 137                         nfi->fib_prefsrc == fi->fib_prefsrc &&
 138                         nfi->fib_priority == fi->fib_priority &&
 139                         memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 &&
 140                         ((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 &&
 141                         (nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0))
 142                                 return fi;
 143         } endfor_fib_info();
 144         return NULL;
 145 }
 146
 147 __le16 dn_fib_get_attr16(struct rtattr *attr, int attrlen, int type)
 148 {
 149         while(RTA_OK(attr,attrlen)) {
 150                 if (attr->rta_type == type)
 151                         return *(__le16*)RTA_DATA(attr);
 152                 attr = RTA_NEXT(attr, attrlen);
 153         }
 154
 155         return 0;
 156 }
 157
 158 static int dn_fib_count_nhs(struct rtattr *rta)
 159 {
 160         int nhs = 0;
 161         struct rtnexthop *nhp = RTA_DATA(rta);
 162         int nhlen = RTA_PAYLOAD(rta);
 163
 164         while(nhlen >= (int)sizeof(struct rtnexthop)) {
 165                 if ((nhlen -= nhp->rtnh_len) < 0)
 166                         return 0;
 167                 nhs++;
 168                 nhp = RTNH_NEXT(nhp);
 169         }
 170
 171         return nhs;
 172 }
 173
 174 static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct rtattr *rta, const struct rtmsg *r)
 175 {
 176         struct rtnexthop *nhp = RTA_DATA(rta);
 177         int nhlen = RTA_PAYLOAD(rta);
 178
 179         change_nexthops(fi) {
 180                 int attrlen = nhlen - sizeof(struct rtnexthop);
 181                 if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
 182                         return -EINVAL;
 183
 184                 nh->nh_flags  = (r->rtm_flags&~0xFF) | nhp->rtnh_flags;
 185                 nh->nh_oif    = nhp->rtnh_ifindex;
 186                 nh->nh_weight = nhp->rtnh_hops + 1;
 187
 188                 if (attrlen) {
 189                         nh->nh_gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
 190                 }
 191                 nhp = RTNH_NEXT(nhp);
 192         } endfor_nexthops(fi);
 193
 194         return 0;
 195 }
 196
 197
 198 static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh)
 199 {
 200         int err;
 201
 202         if (nh->nh_gw) {
 203                 struct flowi fl;
 204                 struct dn_fib_res res;
 205
 206                 if (nh->nh_flags&RTNH_F_ONLINK) {
 207                         struct net_device *dev;
 208
 209                         if (r->rtm_scope >= RT_SCOPE_LINK)
 210                                 return -EINVAL;
 211                         if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST)
 212                                 return -EINVAL;
 213                         if ((dev = __dev_get_by_index(&init_net, nh->nh_oif)) == NULL)
 214                                 return -ENODEV;
 215                         if (!(dev->flags&IFF_UP))
 216                                 return -ENETDOWN;
 217                         nh->nh_dev = dev;
 218                         dev_hold(dev);
 219                         nh->nh_scope = RT_SCOPE_LINK;
 220                         return 0;
 221                 }
 222
 223                 memset(&fl, 0, sizeof(fl));
 224                 fl.fld_dst = nh->nh_gw;
 225                 fl.oif = nh->nh_oif;
 226                 fl.fld_scope = r->rtm_scope + 1;
 227
 228                 if (fl.fld_scope < RT_SCOPE_LINK)
 229                         fl.fld_scope = RT_SCOPE_LINK;
 230
 231                 if ((err = dn_fib_lookup(&fl, &res)) != 0)
 232                         return err;
 233
 234                 err = -EINVAL;
 235                 if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
 236                         goto out;
 237                 nh->nh_scope = res.scope;
 238                 nh->nh_oif = DN_FIB_RES_OIF(res);
 239                 nh->nh_dev = DN_FIB_RES_DEV(res);
 240                 if (nh->nh_dev == NULL)
 241                         goto out;
 242                 dev_hold(nh->nh_dev);
 243                 err = -ENETDOWN;
 244                 if (!(nh->nh_dev->flags & IFF_UP))
 245                         goto out;
 246                 err = 0;
 247 out:
 248                 dn_fib_res_put(&res);
 249                 return err;
 250         } else {
 251                 struct net_device *dev;
 252
 253                 if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK))
 254                         return -EINVAL;
 255
 256                 dev = __dev_get_by_index(&init_net, nh->nh_oif);
 257                 if (dev == NULL || dev->dn_ptr == NULL)
 258                         return -ENODEV;
 259                 if (!(dev->flags&IFF_UP))
 260                         return -ENETDOWN;
 261                 nh->nh_dev = dev;
 262                 dev_hold(nh->nh_dev);
 263                 nh->nh_scope = RT_SCOPE_HOST;
 264         }
 265
 266         return 0;
 267 }
 268
 269
 270 struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct dn_kern_rta *rta, const struct nlmsghdr *nlh, int *errp)
 271 {
 272         int err;
 273         struct dn_fib_info *fi = NULL;
 274         struct dn_fib_info *ofi;
 275         int nhs = 1;
 276
 277         if (r->rtm_type > RTN_MAX)
 278                 goto err_inval;
 279
 280         if (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
 281                 goto err_inval;
 282
 283         if (rta->rta_mp) {
 284                 nhs = dn_fib_count_nhs(rta->rta_mp);
 285                 if (nhs == 0)
 286                         goto err_inval;
 287         }
 288
 289         fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
 290         err = -ENOBUFS;
 291         if (fi == NULL)
 292                 goto failure;
 293
 294         fi->fib_protocol = r->rtm_protocol;
 295         fi->fib_nhs = nhs;
 296         fi->fib_flags = r->rtm_flags;
 297         if (rta->rta_priority)
 298                 fi->fib_priority = *rta->rta_priority;
 299         if (rta->rta_mx) {
 300                 int attrlen = RTA_PAYLOAD(rta->rta_mx);
 301                 struct rtattr *attr = RTA_DATA(rta->rta_mx);
 302
 303                 while(RTA_OK(attr, attrlen)) {
 304                         unsigned flavour = attr->rta_type;
 305                         if (flavour) {
 306                                 if (flavour > RTAX_MAX)
 307                                         goto err_inval;
 308                                 fi->fib_metrics[flavour-1] = *(unsigned*)RTA_DATA(attr);
 309                         }
 310                         attr = RTA_NEXT(attr, attrlen);
 311                 }
 312         }
 313         if (rta->rta_prefsrc)
 314                 memcpy(&fi->fib_prefsrc, rta->rta_prefsrc, 2);
 315
 316         if (rta->rta_mp) {
 317                 if ((err = dn_fib_get_nhs(fi, rta->rta_mp, r)) != 0)
 318                         goto failure;
 319                 if (rta->rta_oif && fi->fib_nh->nh_oif != *rta->rta_oif)
 320                         goto err_inval;
 321                 if (rta->rta_gw && memcmp(&fi->fib_nh->nh_gw, rta->rta_gw, 2))
 322                         goto err_inval;
 323         } else {
 324                 struct dn_fib_nh *nh = fi->fib_nh;
 325                 if (rta->rta_oif)
 326                         nh->nh_oif = *rta->rta_oif;
 327                 if (rta->rta_gw)
 328                         memcpy(&nh->nh_gw, rta->rta_gw, 2);
 329                 nh->nh_flags = r->rtm_flags;
 330                 nh->nh_weight = 1;
 331         }
 332
 333         if (r->rtm_type == RTN_NAT) {
 334                 if (rta->rta_gw == NULL || nhs != 1 || rta->rta_oif)
 335                         goto err_inval;
 336                 memcpy(&fi->fib_nh->nh_gw, rta->rta_gw, 2);
 337                 goto link_it;
 338         }
 339
 340         if (dn_fib_props[r->rtm_type].error) {
 341                 if (rta->rta_gw || rta->rta_oif || rta->rta_mp)
 342                         goto err_inval;
 343                 goto link_it;
 344         }
 345
 346         if (r->rtm_scope > RT_SCOPE_HOST)
 347                 goto err_inval;
 348
 349         if (r->rtm_scope == RT_SCOPE_HOST) {
 350                 struct dn_fib_nh *nh = fi->fib_nh;
 351
 352                 /* Local address is added */
 353                 if (nhs != 1 || nh->nh_gw)
 354                         goto err_inval;
 355                 nh->nh_scope = RT_SCOPE_NOWHERE;
 356                 nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif);
 357                 err = -ENODEV;
 358                 if (nh->nh_dev == NULL)
 359                         goto failure;
 360         } else {
 361                 change_nexthops(fi) {
 362                         if ((err = dn_fib_check_nh(r, fi, nh)) != 0)
 363                                 goto failure;
 364                 } endfor_nexthops(fi)
 365         }
 366
 367         if (fi->fib_prefsrc) {
 368                 if (r->rtm_type != RTN_LOCAL || rta->rta_dst == NULL ||
 369                     memcmp(&fi->fib_prefsrc, rta->rta_dst, 2))
 370                         if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
 371                                 goto err_inval;
 372         }
 373
 374 link_it:
 375         if ((ofi = dn_fib_find_info(fi)) != NULL) {
 376                 fi->fib_dead = 1;
 377                 dn_fib_free_info(fi);
 378                 ofi->fib_treeref++;
 379                 return ofi;
 380         }
 381
 382         fi->fib_treeref++;
 383         atomic_inc(&fi->fib_clntref);
 384         spin_lock(&dn_fib_info_lock);
 385         fi->fib_next = dn_fib_info_list;
 386         fi->fib_prev = NULL;
 387         if (dn_fib_info_list)
 388                 dn_fib_info_list->fib_prev = fi;
 389         dn_fib_info_list = fi;
 390         spin_unlock(&dn_fib_info_lock);
 391         return fi;
 392
 393 err_inval:
 394         err = -EINVAL;
 395
 396 failure:
 397         *errp = err;
 398         if (fi) {
 399                 fi->fib_dead = 1;
 400                 dn_fib_free_info(fi);
 401         }
 402
 403         return NULL;
 404 }
 405
 406 int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowi *fl, struct dn_fib_res *res)
 407 {
 408         int err = dn_fib_props[type].error;
 409
 410         if (err == 0) {
 411                 if (fi->fib_flags & RTNH_F_DEAD)
 412                         return 1;
 413
 414                 res->fi = fi;
 415
 416                 switch(type) {
 417                         case RTN_NAT:
 418                                 DN_FIB_RES_RESET(*res);
 419                                 atomic_inc(&fi->fib_clntref);
 420                                 return 0;
 421                         case RTN_UNICAST:
 422                         case RTN_LOCAL:
 423                                 for_nexthops(fi) {
 424                                         if (nh->nh_flags & RTNH_F_DEAD)
 425                                                 continue;
 426                                         if (!fl->oif || fl->oif == nh->nh_oif)
 427                                                 break;
 428                                 }
 429                                 if (nhsel < fi->fib_nhs) {
 430                                         res->nh_sel = nhsel;
 431                                         atomic_inc(&fi->fib_clntref);
 432                                         return 0;
 433                                 }
 434                                 endfor_nexthops(fi);
 435                                 res->fi = NULL;
 436                                 return 1;
 437                         default:
 438                                 if (net_ratelimit())
 439                                          printk("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n", type);
 440                                 res->fi = NULL;
 441                                 return -EINVAL;
 442                 }
 443         }
 444         return err;
 445 }
 446
 447 void dn_fib_select_multipath(const struct flowi *fl, struct dn_fib_res *res)
 448 {
 449         struct dn_fib_info *fi = res->fi;
 450         int w;
 451
 452         spin_lock_bh(&dn_fib_multipath_lock);
 453         if (fi->fib_power <= 0) {
 454                 int power = 0;
 455                 change_nexthops(fi) {
 456                         if (!(nh->nh_flags&RTNH_F_DEAD)) {
 457                                 power += nh->nh_weight;
 458                                 nh->nh_power = nh->nh_weight;
 459                         }
 460                 } endfor_nexthops(fi);
 461                 fi->fib_power = power;
 462                 if (power < 0) {
 463                         spin_unlock_bh(&dn_fib_multipath_lock);
 464                         res->nh_sel = 0;
 465                         return;
 466                 }
 467         }
 468
 469         w = jiffies % fi->fib_power;
 470
 471         change_nexthops(fi) {
 472                 if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
 473                         if ((w -= nh->nh_power) <= 0) {
 474                                 nh->nh_power--;
 475                                 fi->fib_power--;
 476                                 res->nh_sel = nhsel;
 477                                 spin_unlock_bh(&dn_fib_multipath_lock);
 478                                 return;
 479                         }
 480                 }
 481         } endfor_nexthops(fi);
 482         res->nh_sel = 0;
 483         spin_unlock_bh(&dn_fib_multipath_lock);
 484 }
 485
 486
 487 static int dn_fib_check_attr(struct rtmsg *r, struct rtattr **rta)
 488 {
 489         int i;
 490
 491         for(i = 1; i <= RTA_MAX; i++) {
 492                 struct rtattr *attr = rta[i-1];
 493                 if (attr) {
 494                         if (RTA_PAYLOAD(attr) < 4 && RTA_PAYLOAD(attr) != 2)
 495                                 return -EINVAL;
 496                         if (i != RTA_MULTIPATH && i != RTA_METRICS &&
 497                             i != RTA_TABLE)
 498                                 rta[i-1] = (struct rtattr *)RTA_DATA(attr);
 499                 }
 500         }
 501
 502         return 0;
 503 }
 504
 505 static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 506 {
 507         struct net *net = sock_net(skb->sk);
 508         struct dn_fib_table *tb;
 509         struct rtattr **rta = arg;
 510         struct rtmsg *r = NLMSG_DATA(nlh);
 511
 512         if (net != &init_net)
 513                 return -EINVAL;
 514
 515         if (dn_fib_check_attr(r, rta))
 516                 return -EINVAL;
 517
 518         tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 0);
 519         if (tb)
 520                 return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
 521
 522         return -ESRCH;
 523 }
 524
 525 static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 526 {
 527         struct net *net = sock_net(skb->sk);
 528         struct dn_fib_table *tb;
 529         struct rtattr **rta = arg;
 530         struct rtmsg *r = NLMSG_DATA(nlh);
 531
 532         if (net != &init_net)
 533                 return -EINVAL;
 534
 535         if (dn_fib_check_attr(r, rta))
 536                 return -EINVAL;
 537
 538         tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 1);
 539         if (tb)
 540                 return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
 541
 542         return -ENOBUFS;
 543 }
 544
 545 static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
 546 {
 547         struct dn_fib_table *tb;
 548         struct {
 549                 struct nlmsghdr nlh;
 550                 struct rtmsg rtm;
 551         } req;
 552         struct dn_kern_rta rta;
 553
 554         memset(&req.rtm, 0, sizeof(req.rtm));
 555         memset(&rta, 0, sizeof(rta));
 556
 557         if (type == RTN_UNICAST)
 558                 tb = dn_fib_get_table(RT_MIN_TABLE, 1);
 559         else
 560                 tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
 561
 562         if (tb == NULL)
 563                 return;
 564
 565         req.nlh.nlmsg_len = sizeof(req);
 566         req.nlh.nlmsg_type = cmd;
 567         req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
 568         req.nlh.nlmsg_pid = 0;
 569         req.nlh.nlmsg_seq = 0;
 570
 571         req.rtm.rtm_dst_len = dst_len;
 572         req.rtm.rtm_table = tb->n;
 573         req.rtm.rtm_protocol = RTPROT_KERNEL;
 574         req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
 575         req.rtm.rtm_type = type;
 576
 577         rta.rta_dst = &dst;
 578         rta.rta_prefsrc = &ifa->ifa_local;
 579         rta.rta_oif = &ifa->ifa_dev->dev->ifindex;
 580
 581         if (cmd == RTM_NEWROUTE)
 582                 tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL);
 583         else
 584                 tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL);
 585 }
 586
 587 static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
 588 {
 589
 590         fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
 591
 592 #if 0
 593         if (!(dev->flags&IFF_UP))
 594                 return;
 595         /* In the future, we will want to add default routes here */
 596
 597 #endif
 598 }
 599
 600 static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
 601 {
 602         int found_it = 0;
 603         struct net_device *dev;
 604         struct dn_dev *dn_db;
 605         struct dn_ifaddr *ifa2;
 606
 607         ASSERT_RTNL();
 608
 609         /* Scan device list */
 610         read_lock(&dev_base_lock);
 611         for_each_netdev(&init_net, dev) {
 612                 dn_db = dev->dn_ptr;
 613                 if (dn_db == NULL)
 614                         continue;
 615                 for(ifa2 = dn_db->ifa_list; ifa2; ifa2 = ifa2->ifa_next) {
 616                         if (ifa2->ifa_local == ifa->ifa_local) {
 617                                 found_it = 1;
 618                                 break;
 619                         }
 620                 }
 621         }
 622         read_unlock(&dev_base_lock);
 623
 624         if (found_it == 0) {
 625                 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
 626
 627                 if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
 628                         if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
 629                                 dn_fib_flush();
 630                 }
 631         }
 632 }
 633
 634 static void dn_fib_disable_addr(struct net_device *dev, int force)
 635 {
 636         if (dn_fib_sync_down(0, dev, force))
 637                 dn_fib_flush();
 638         dn_rt_cache_flush(0);
 639         neigh_ifdown(&dn_neigh_table, dev);
 640 }
 641
 642 static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
 643 {
 644         struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
 645
 646         switch(event) {
 647                 case NETDEV_UP:
 648                         dn_fib_add_ifaddr(ifa);
 649                         dn_fib_sync_up(ifa->ifa_dev->dev);
 650                         dn_rt_cache_flush(-1);
 651                         break;
 652                 case NETDEV_DOWN:
 653                         dn_fib_del_ifaddr(ifa);
 654                         if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
 655                                 dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
 656                         } else {
 657                                 dn_rt_cache_flush(-1);
 658                         }
 659                         break;
 660         }
 661         return NOTIFY_DONE;
 662 }
 663
 664 static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force)
 665 {
 666         int ret = 0;
 667         int scope = RT_SCOPE_NOWHERE;
 668
 669         if (force)
 670                 scope = -1;
 671
 672         for_fib_info() {
 673                 /*
 674                  * This makes no sense for DECnet.... we will almost
 675                  * certainly have more than one local address the same
 676                  * over all our interfaces. It needs thinking about
 677                  * some more.
 678                  */
 679                 if (local && fi->fib_prefsrc == local) {
 680                         fi->fib_flags |= RTNH_F_DEAD;
 681                         ret++;
 682                 } else if (dev && fi->fib_nhs) {
 683                         int dead = 0;
 684
 685                         change_nexthops(fi) {
 686                                 if (nh->nh_flags&RTNH_F_DEAD)
 687                                         dead++;
 688                                 else if (nh->nh_dev == dev &&
 689                                                 nh->nh_scope != scope) {
 690                                         spin_lock_bh(&dn_fib_multipath_lock);
 691                                         nh->nh_flags |= RTNH_F_DEAD;
 692                                         fi->fib_power -= nh->nh_power;
 693                                         nh->nh_power = 0;
 694                                         spin_unlock_bh(&dn_fib_multipath_lock);
 695                                         dead++;
 696                                 }
 697                         } endfor_nexthops(fi)
 698                         if (dead == fi->fib_nhs) {
 699                                 fi->fib_flags |= RTNH_F_DEAD;
 700                                 ret++;
 701                         }
 702                 }
 703         } endfor_fib_info();
 704         return ret;
 705 }
 706
 707
 708 static int dn_fib_sync_up(struct net_device *dev)
 709 {
 710         int ret = 0;
 711
 712         if (!(dev->flags&IFF_UP))
 713                 return 0;
 714
 715         for_fib_info() {
 716                 int alive = 0;
 717
 718                 change_nexthops(fi) {
 719                         if (!(nh->nh_flags&RTNH_F_DEAD)) {
 720                                 alive++;
 721                                 continue;
 722                         }
 723                         if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
 724                                 continue;
 725                         if (nh->nh_dev != dev || dev->dn_ptr == NULL)
 726                                 continue;
 727                         alive++;
 728                         spin_lock_bh(&dn_fib_multipath_lock);
 729                         nh->nh_power = 0;
 730                         nh->nh_flags &= ~RTNH_F_DEAD;
 731                         spin_unlock_bh(&dn_fib_multipath_lock);
 732                 } endfor_nexthops(fi);
 733
 734                 if (alive > 0) {
 735                         fi->fib_flags &= ~RTNH_F_DEAD;
 736                         ret++;
 737                 }
 738         } endfor_fib_info();
 739         return ret;
 740 }
 741
 742 static struct notifier_block dn_fib_dnaddr_notifier = {
 743         .notifier_call = dn_fib_dnaddr_event,
 744 };
 745
 746 void __exit dn_fib_cleanup(void)
 747 {
 748         dn_fib_table_cleanup();
 749         dn_fib_rules_cleanup();
 750
 751         unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
 752 }
 753
 754
 755 void __init dn_fib_init(void)
 756 {
 757         dn_fib_table_init();
 758         dn_fib_rules_init();
 759
 760         register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
 761
 762         rtnl_register(PF_DECnet, RTM_NEWROUTE, dn_fib_rtm_newroute, NULL);
 763         rtnl_register(PF_DECnet, RTM_DELROUTE, dn_fib_rtm_delroute, NULL);
 764 }
 765
 766