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[RTA_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                 memset(&fl, 0, sizeof(fl));
 207
 208                 if (nh->nh_flags&RTNH_F_ONLINK) {
 209                         struct net_device *dev;
 210
 211                         if (r->rtm_scope >= RT_SCOPE_LINK)
 212                                 return -EINVAL;
 213                         if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST)
 214                                 return -EINVAL;
 215                         if ((dev = __dev_get_by_index(nh->nh_oif)) == NULL)
 216                                 return -ENODEV;
 217                         if (!(dev->flags&IFF_UP))
 218                                 return -ENETDOWN;
 219                         nh->nh_dev = dev;
 220                         dev_hold(dev);
 221                         nh->nh_scope = RT_SCOPE_LINK;
 222                         return 0;
 223                 }
 224
 225                 memset(&fl, 0, sizeof(fl));
 226                 fl.fld_dst = nh->nh_gw;
 227                 fl.oif = nh->nh_oif;
 228                 fl.fld_scope = r->rtm_scope + 1;
 229
 230                 if (fl.fld_scope < RT_SCOPE_LINK)
 231                         fl.fld_scope = RT_SCOPE_LINK;
 232
 233                 if ((err = dn_fib_lookup(&fl, &res)) != 0)
 234                         return err;
 235
 236                 err = -EINVAL;
 237                 if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
 238                         goto out;
 239                 nh->nh_scope = res.scope;
 240                 nh->nh_oif = DN_FIB_RES_OIF(res);
 241                 nh->nh_dev = DN_FIB_RES_DEV(res);
 242                 if (nh->nh_dev == NULL)
 243                         goto out;
 244                 dev_hold(nh->nh_dev);
 245                 err = -ENETDOWN;
 246                 if (!(nh->nh_dev->flags & IFF_UP))
 247                         goto out;
 248                 err = 0;
 249 out:
 250                 dn_fib_res_put(&res);
 251                 return err;
 252         } else {
 253                 struct net_device *dev;
 254
 255                 if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK))
 256                         return -EINVAL;
 257
 258                 dev = __dev_get_by_index(nh->nh_oif);
 259                 if (dev == NULL || dev->dn_ptr == NULL)
 260                         return -ENODEV;
 261                 if (!(dev->flags&IFF_UP))
 262                         return -ENETDOWN;
 263                 nh->nh_dev = dev;
 264                 dev_hold(nh->nh_dev);
 265                 nh->nh_scope = RT_SCOPE_HOST;
 266         }
 267
 268         return 0;
 269 }
 270
 271
 272 struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct dn_kern_rta *rta, const struct nlmsghdr *nlh, int *errp)
 273 {
 274         int err;
 275         struct dn_fib_info *fi = NULL;
 276         struct dn_fib_info *ofi;
 277         int nhs = 1;
 278
 279         if (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
 280                 goto err_inval;
 281
 282         if (rta->rta_mp) {
 283                 nhs = dn_fib_count_nhs(rta->rta_mp);
 284                 if (nhs == 0)
 285                         goto err_inval;
 286         }
 287
 288         fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
 289         err = -ENOBUFS;
 290         if (fi == NULL)
 291                 goto failure;
 292
 293         fi->fib_protocol = r->rtm_protocol;
 294         fi->fib_nhs = nhs;
 295         fi->fib_flags = r->rtm_flags;
 296         if (rta->rta_priority)
 297                 fi->fib_priority = *rta->rta_priority;
 298         if (rta->rta_mx) {
 299                 int attrlen = RTA_PAYLOAD(rta->rta_mx);
 300                 struct rtattr *attr = RTA_DATA(rta->rta_mx);
 301
 302                 while(RTA_OK(attr, attrlen)) {
 303                         unsigned flavour = attr->rta_type;
 304                         if (flavour) {
 305                                 if (flavour > RTAX_MAX)
 306                                         goto err_inval;
 307                                 fi->fib_metrics[flavour-1] = *(unsigned*)RTA_DATA(attr);
 308                         }
 309                         attr = RTA_NEXT(attr, attrlen);
 310                 }
 311         }
 312         if (rta->rta_prefsrc)
 313                 memcpy(&fi->fib_prefsrc, rta->rta_prefsrc, 2);
 314
 315         if (rta->rta_mp) {
 316                 if ((err = dn_fib_get_nhs(fi, rta->rta_mp, r)) != 0)
 317                         goto failure;
 318                 if (rta->rta_oif && fi->fib_nh->nh_oif != *rta->rta_oif)
 319                         goto err_inval;
 320                 if (rta->rta_gw && memcmp(&fi->fib_nh->nh_gw, rta->rta_gw, 2))
 321                         goto err_inval;
 322         } else {
 323                 struct dn_fib_nh *nh = fi->fib_nh;
 324                 if (rta->rta_oif)
 325                         nh->nh_oif = *rta->rta_oif;
 326                 if (rta->rta_gw)
 327                         memcpy(&nh->nh_gw, rta->rta_gw, 2);
 328                 nh->nh_flags = r->rtm_flags;
 329                 nh->nh_weight = 1;
 330         }
 331
 332         if (r->rtm_type == RTN_NAT) {
 333                 if (rta->rta_gw == NULL || nhs != 1 || rta->rta_oif)
 334                         goto err_inval;
 335                 memcpy(&fi->fib_nh->nh_gw, rta->rta_gw, 2);
 336                 goto link_it;
 337         }
 338
 339         if (dn_fib_props[r->rtm_type].error) {
 340                 if (rta->rta_gw || rta->rta_oif || rta->rta_mp)
 341                         goto err_inval;
 342                 goto link_it;
 343         }
 344
 345         if (r->rtm_scope > RT_SCOPE_HOST)
 346                 goto err_inval;
 347
 348         if (r->rtm_scope == RT_SCOPE_HOST) {
 349                 struct dn_fib_nh *nh = fi->fib_nh;
 350
 351                 /* Local address is added */
 352                 if (nhs != 1 || nh->nh_gw)
 353                         goto err_inval;
 354                 nh->nh_scope = RT_SCOPE_NOWHERE;
 355                 nh->nh_dev = dev_get_by_index(fi->fib_nh->nh_oif);
 356                 err = -ENODEV;
 357                 if (nh->nh_dev == NULL)
 358                         goto failure;
 359         } else {
 360                 change_nexthops(fi) {
 361                         if ((err = dn_fib_check_nh(r, fi, nh)) != 0)
 362                                 goto failure;
 363                 } endfor_nexthops(fi)
 364         }
 365
 366         if (fi->fib_prefsrc) {
 367                 if (r->rtm_type != RTN_LOCAL || rta->rta_dst == NULL ||
 368                     memcmp(&fi->fib_prefsrc, rta->rta_dst, 2))
 369                         if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
 370                                 goto err_inval;
 371         }
 372
 373 link_it:
 374         if ((ofi = dn_fib_find_info(fi)) != NULL) {
 375                 fi->fib_dead = 1;
 376                 dn_fib_free_info(fi);
 377                 ofi->fib_treeref++;
 378                 return ofi;
 379         }
 380
 381         fi->fib_treeref++;
 382         atomic_inc(&fi->fib_clntref);
 383         spin_lock(&dn_fib_info_lock);
 384         fi->fib_next = dn_fib_info_list;
 385         fi->fib_prev = NULL;
 386         if (dn_fib_info_list)
 387                 dn_fib_info_list->fib_prev = fi;
 388         dn_fib_info_list = fi;
 389         spin_unlock(&dn_fib_info_lock);
 390         return fi;
 391
 392 err_inval:
 393         err = -EINVAL;
 394
 395 failure:
 396         *errp = err;
 397         if (fi) {
 398                 fi->fib_dead = 1;
 399                 dn_fib_free_info(fi);
 400         }
 401
 402         return NULL;
 403 }
 404
 405 int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowi *fl, struct dn_fib_res *res)
 406 {
 407         int err = dn_fib_props[type].error;
 408
 409         if (err == 0) {
 410                 if (fi->fib_flags & RTNH_F_DEAD)
 411                         return 1;
 412
 413                 res->fi = fi;
 414
 415                 switch(type) {
 416                         case RTN_NAT:
 417                                 DN_FIB_RES_RESET(*res);
 418                                 atomic_inc(&fi->fib_clntref);
 419                                 return 0;
 420                         case RTN_UNICAST:
 421                         case RTN_LOCAL:
 422                                 for_nexthops(fi) {
 423                                         if (nh->nh_flags & RTNH_F_DEAD)
 424                                                 continue;
 425                                         if (!fl->oif || fl->oif == nh->nh_oif)
 426                                                 break;
 427                                 }
 428                                 if (nhsel < fi->fib_nhs) {
 429                                         res->nh_sel = nhsel;
 430                                         atomic_inc(&fi->fib_clntref);
 431                                         return 0;
 432                                 }
 433                                 endfor_nexthops(fi);
 434                                 res->fi = NULL;
 435                                 return 1;
 436                         default:
 437                                 if (net_ratelimit())
 438                                          printk("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n", type);
 439                                 res->fi = NULL;
 440                                 return -EINVAL;
 441                 }
 442         }
 443         return err;
 444 }
 445
 446 void dn_fib_select_multipath(const struct flowi *fl, struct dn_fib_res *res)
 447 {
 448         struct dn_fib_info *fi = res->fi;
 449         int w;
 450
 451         spin_lock_bh(&dn_fib_multipath_lock);
 452         if (fi->fib_power <= 0) {
 453                 int power = 0;
 454                 change_nexthops(fi) {
 455                         if (!(nh->nh_flags&RTNH_F_DEAD)) {
 456                                 power += nh->nh_weight;
 457                                 nh->nh_power = nh->nh_weight;
 458                         }
 459                 } endfor_nexthops(fi);
 460                 fi->fib_power = power;
 461                 if (power < 0) {
 462                         spin_unlock_bh(&dn_fib_multipath_lock);
 463                         res->nh_sel = 0;
 464                         return;
 465                 }
 466         }
 467
 468         w = jiffies % fi->fib_power;
 469
 470         change_nexthops(fi) {
 471                 if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
 472                         if ((w -= nh->nh_power) <= 0) {
 473                                 nh->nh_power--;
 474                                 fi->fib_power--;
 475                                 res->nh_sel = nhsel;
 476                                 spin_unlock_bh(&dn_fib_multipath_lock);
 477                                 return;
 478                         }
 479                 }
 480         } endfor_nexthops(fi);
 481         res->nh_sel = 0;
 482         spin_unlock_bh(&dn_fib_multipath_lock);
 483 }
 484
 485
 486 static int dn_fib_check_attr(struct rtmsg *r, struct rtattr **rta)
 487 {
 488         int i;
 489
 490         for(i = 1; i <= RTA_MAX; i++) {
 491                 struct rtattr *attr = rta[i-1];
 492                 if (attr) {
 493                         if (RTA_PAYLOAD(attr) < 4 && RTA_PAYLOAD(attr) != 2)
 494                                 return -EINVAL;
 495                         if (i != RTA_MULTIPATH && i != RTA_METRICS &&
 496                             i != RTA_TABLE)
 497                                 rta[i-1] = (struct rtattr *)RTA_DATA(attr);
 498                 }
 499         }
 500
 501         return 0;
 502 }
 503
 504 int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 505 {
 506         struct dn_fib_table *tb;
 507         struct rtattr **rta = arg;
 508         struct rtmsg *r = NLMSG_DATA(nlh);
 509
 510         if (dn_fib_check_attr(r, rta))
 511                 return -EINVAL;
 512
 513         tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 0);
 514         if (tb)
 515                 return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
 516
 517         return -ESRCH;
 518 }
 519
 520 int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 521 {
 522         struct dn_fib_table *tb;
 523         struct rtattr **rta = arg;
 524         struct rtmsg *r = NLMSG_DATA(nlh);
 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), 1);
 530         if (tb)
 531                 return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
 532
 533         return -ENOBUFS;
 534 }
 535
 536 static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
 537 {
 538         struct dn_fib_table *tb;
 539         struct {
 540                 struct nlmsghdr nlh;
 541                 struct rtmsg rtm;
 542         } req;
 543         struct dn_kern_rta rta;
 544
 545         memset(&req.rtm, 0, sizeof(req.rtm));
 546         memset(&rta, 0, sizeof(rta));
 547
 548         if (type == RTN_UNICAST)
 549                 tb = dn_fib_get_table(RT_MIN_TABLE, 1);
 550         else
 551                 tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
 552
 553         if (tb == NULL)
 554                 return;
 555
 556         req.nlh.nlmsg_len = sizeof(req);
 557         req.nlh.nlmsg_type = cmd;
 558         req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
 559         req.nlh.nlmsg_pid = 0;
 560         req.nlh.nlmsg_seq = 0;
 561
 562         req.rtm.rtm_dst_len = dst_len;
 563         req.rtm.rtm_table = tb->n;
 564         req.rtm.rtm_protocol = RTPROT_KERNEL;
 565         req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
 566         req.rtm.rtm_type = type;
 567
 568         rta.rta_dst = &dst;
 569         rta.rta_prefsrc = &ifa->ifa_local;
 570         rta.rta_oif = &ifa->ifa_dev->dev->ifindex;
 571
 572         if (cmd == RTM_NEWROUTE)
 573                 tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL);
 574         else
 575                 tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL);
 576 }
 577
 578 static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
 579 {
 580
 581         fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
 582
 583 #if 0
 584         if (!(dev->flags&IFF_UP))
 585                 return;
 586         /* In the future, we will want to add default routes here */
 587
 588 #endif
 589 }
 590
 591 static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
 592 {
 593         int found_it = 0;
 594         struct net_device *dev;
 595         struct dn_dev *dn_db;
 596         struct dn_ifaddr *ifa2;
 597
 598         ASSERT_RTNL();
 599
 600         /* Scan device list */
 601         read_lock(&dev_base_lock);
 602         for(dev = dev_base; dev; dev = dev->next) {
 603                 dn_db = dev->dn_ptr;
 604                 if (dn_db == NULL)
 605                         continue;
 606                 for(ifa2 = dn_db->ifa_list; ifa2; ifa2 = ifa2->ifa_next) {
 607                         if (ifa2->ifa_local == ifa->ifa_local) {
 608                                 found_it = 1;
 609                                 break;
 610                         }
 611                 }
 612         }
 613         read_unlock(&dev_base_lock);
 614
 615         if (found_it == 0) {
 616                 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
 617
 618                 if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
 619                         if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
 620                                 dn_fib_flush();
 621                 }
 622         }
 623 }
 624
 625 static void dn_fib_disable_addr(struct net_device *dev, int force)
 626 {
 627         if (dn_fib_sync_down(0, dev, force))
 628                 dn_fib_flush();
 629         dn_rt_cache_flush(0);
 630         neigh_ifdown(&dn_neigh_table, dev);
 631 }
 632
 633 static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
 634 {
 635         struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
 636
 637         switch(event) {
 638                 case NETDEV_UP:
 639                         dn_fib_add_ifaddr(ifa);
 640                         dn_fib_sync_up(ifa->ifa_dev->dev);
 641                         dn_rt_cache_flush(-1);
 642                         break;
 643                 case NETDEV_DOWN:
 644                         dn_fib_del_ifaddr(ifa);
 645                         if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
 646                                 dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
 647                         } else {
 648                                 dn_rt_cache_flush(-1);
 649                         }
 650                         break;
 651         }
 652         return NOTIFY_DONE;
 653 }
 654
 655 static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force)
 656 {
 657         int ret = 0;
 658         int scope = RT_SCOPE_NOWHERE;
 659
 660         if (force)
 661                 scope = -1;
 662
 663         for_fib_info() {
 664                 /*
 665                  * This makes no sense for DECnet.... we will almost
 666                  * certainly have more than one local address the same
 667                  * over all our interfaces. It needs thinking about
 668                  * some more.
 669                  */
 670                 if (local && fi->fib_prefsrc == local) {
 671                         fi->fib_flags |= RTNH_F_DEAD;
 672                         ret++;
 673                 } else if (dev && fi->fib_nhs) {
 674                         int dead = 0;
 675
 676                         change_nexthops(fi) {
 677                                 if (nh->nh_flags&RTNH_F_DEAD)
 678                                         dead++;
 679                                 else if (nh->nh_dev == dev &&
 680                                                 nh->nh_scope != scope) {
 681                                         spin_lock_bh(&dn_fib_multipath_lock);
 682                                         nh->nh_flags |= RTNH_F_DEAD;
 683                                         fi->fib_power -= nh->nh_power;
 684                                         nh->nh_power = 0;
 685                                         spin_unlock_bh(&dn_fib_multipath_lock);
 686                                         dead++;
 687                                 }
 688                         } endfor_nexthops(fi)
 689                         if (dead == fi->fib_nhs) {
 690                                 fi->fib_flags |= RTNH_F_DEAD;
 691                                 ret++;
 692                         }
 693                 }
 694         } endfor_fib_info();
 695         return ret;
 696 }
 697
 698
 699 static int dn_fib_sync_up(struct net_device *dev)
 700 {
 701         int ret = 0;
 702
 703         if (!(dev->flags&IFF_UP))
 704                 return 0;
 705
 706         for_fib_info() {
 707                 int alive = 0;
 708
 709                 change_nexthops(fi) {
 710                         if (!(nh->nh_flags&RTNH_F_DEAD)) {
 711                                 alive++;
 712                                 continue;
 713                         }
 714                         if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
 715                                 continue;
 716                         if (nh->nh_dev != dev || dev->dn_ptr == NULL)
 717                                 continue;
 718                         alive++;
 719                         spin_lock_bh(&dn_fib_multipath_lock);
 720                         nh->nh_power = 0;
 721                         nh->nh_flags &= ~RTNH_F_DEAD;
 722                         spin_unlock_bh(&dn_fib_multipath_lock);
 723                 } endfor_nexthops(fi);
 724
 725                 if (alive > 0) {
 726                         fi->fib_flags &= ~RTNH_F_DEAD;
 727                         ret++;
 728                 }
 729         } endfor_fib_info();
 730         return ret;
 731 }
 732
 733 static struct notifier_block dn_fib_dnaddr_notifier = {
 734         .notifier_call = dn_fib_dnaddr_event,
 735 };
 736
 737 void __exit dn_fib_cleanup(void)
 738 {
 739         dn_fib_table_cleanup();
 740         dn_fib_rules_cleanup();
 741
 742         unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
 743 }
 744
 745
 746 void __init dn_fib_init(void)
 747 {
 748
 749         dn_fib_table_init();
 750         dn_fib_rules_init();
 751
 752         register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
 753 }
 754
 755