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/dn.h>
  38 #include <net/dn_route.h>
  39 #include <net/dn_fib.h>
  40 #include <net/dn_neigh.h>
  41 #include <net/dn_dev.h>
  42
  43 #define RT_MIN_TABLE 1
  44
  45 #define for_fib_info() { struct dn_fib_info *fi;\
  46         for(fi = dn_fib_info_list; fi; fi = fi->fib_next)
  47 #define endfor_fib_info() }
  48
  49 #define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
  50         for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
  51
  52 #define change_nexthops(fi) { int nhsel; struct dn_fib_nh *nh;\
  53         for(nhsel = 0, nh = (struct dn_fib_nh *)((fi)->fib_nh); nhsel < (fi)->fib_nhs; nh++, nhsel++)
  54
  55 #define endfor_nexthops(fi) }
  56
  57 extern int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb);
  58
  59 static DEFINE_SPINLOCK(dn_fib_multipath_lock);
  60 static struct dn_fib_info *dn_fib_info_list;
  61 static DEFINE_RWLOCK(dn_fib_info_lock);
  62
  63 static struct
  64 {
  65         int error;
  66         u8 scope;
  67 } dn_fib_props[RTA_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
  82 void dn_fib_free_info(struct dn_fib_info *fi)
  83 {
  84         if (fi->fib_dead == 0) {
  85                 printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n");
  86                 return;
  87         }
  88
  89         change_nexthops(fi) {
  90                 if (nh->nh_dev)
  91                         dev_put(nh->nh_dev);
  92                 nh->nh_dev = NULL;
  93         } endfor_nexthops(fi);
  94         kfree(fi);
  95 }
  96
  97 void dn_fib_release_info(struct dn_fib_info *fi)
  98 {
  99         write_lock(&dn_fib_info_lock);
 100         if (fi && --fi->fib_treeref == 0) {
 101                 if (fi->fib_next)
 102                         fi->fib_next->fib_prev = fi->fib_prev;
 103                 if (fi->fib_prev)
 104                         fi->fib_prev->fib_next = fi->fib_next;
 105                 if (fi == dn_fib_info_list)
 106                         dn_fib_info_list = fi->fib_next;
 107                 fi->fib_dead = 1;
 108                 dn_fib_info_put(fi);
 109         }
 110         write_unlock(&dn_fib_info_lock);
 111 }
 112
 113 static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi)
 114 {
 115         const struct dn_fib_nh *onh = ofi->fib_nh;
 116
 117         for_nexthops(fi) {
 118                 if (nh->nh_oif != onh->nh_oif ||
 119                         nh->nh_gw != onh->nh_gw ||
 120                         nh->nh_scope != onh->nh_scope ||
 121                         nh->nh_weight != onh->nh_weight ||
 122                         ((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD))
 123                                 return -1;
 124                 onh++;
 125         } endfor_nexthops(fi);
 126         return 0;
 127 }
 128
 129 static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi)
 130 {
 131         for_fib_info() {
 132                 if (fi->fib_nhs != nfi->fib_nhs)
 133                         continue;
 134                 if (nfi->fib_protocol == fi->fib_protocol &&
 135                         nfi->fib_prefsrc == fi->fib_prefsrc &&
 136                         nfi->fib_priority == fi->fib_priority &&
 137                         memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 &&
 138                         ((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 &&
 139                         (nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0))
 140                                 return fi;
 141         } endfor_fib_info();
 142         return NULL;
 143 }
 144
 145 __le16 dn_fib_get_attr16(struct rtattr *attr, int attrlen, int type)
 146 {
 147         while(RTA_OK(attr,attrlen)) {
 148                 if (attr->rta_type == type)
 149                         return *(__le16*)RTA_DATA(attr);
 150                 attr = RTA_NEXT(attr, attrlen);
 151         }
 152
 153         return 0;
 154 }
 155
 156 static int dn_fib_count_nhs(struct rtattr *rta)
 157 {
 158         int nhs = 0;
 159         struct rtnexthop *nhp = RTA_DATA(rta);
 160         int nhlen = RTA_PAYLOAD(rta);
 161
 162         while(nhlen >= (int)sizeof(struct rtnexthop)) {
 163                 if ((nhlen -= nhp->rtnh_len) < 0)
 164                         return 0;
 165                 nhs++;
 166                 nhp = RTNH_NEXT(nhp);
 167         }
 168
 169         return nhs;
 170 }
 171
 172 static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct rtattr *rta, const struct rtmsg *r)
 173 {
 174         struct rtnexthop *nhp = RTA_DATA(rta);
 175         int nhlen = RTA_PAYLOAD(rta);
 176
 177         change_nexthops(fi) {
 178                 int attrlen = nhlen - sizeof(struct rtnexthop);
 179                 if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
 180                         return -EINVAL;
 181
 182                 nh->nh_flags  = (r->rtm_flags&~0xFF) | nhp->rtnh_flags;
 183                 nh->nh_oif    = nhp->rtnh_ifindex;
 184                 nh->nh_weight = nhp->rtnh_hops + 1;
 185
 186                 if (attrlen) {
 187                         nh->nh_gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
 188                 }
 189                 nhp = RTNH_NEXT(nhp);
 190         } endfor_nexthops(fi);
 191
 192         return 0;
 193 }
 194
 195
 196 static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh)
 197 {
 198         int err;
 199
 200         if (nh->nh_gw) {
 201                 struct flowi fl;
 202                 struct dn_fib_res res;
 203
 204                 memset(&fl, 0, sizeof(fl));
 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(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(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 (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
 278                 goto err_inval;
 279
 280         if (rta->rta_mp) {
 281                 nhs = dn_fib_count_nhs(rta->rta_mp);
 282                 if (nhs == 0)
 283                         goto err_inval;
 284         }
 285
 286         fi = kmalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
 287         err = -ENOBUFS;
 288         if (fi == NULL)
 289                 goto failure;
 290         memset(fi, 0, sizeof(*fi)+nhs*sizeof(struct dn_fib_nh));
 291
 292         fi->fib_protocol = r->rtm_protocol;
 293         fi->fib_nhs = nhs;
 294         fi->fib_flags = r->rtm_flags;
 295         if (rta->rta_priority)
 296                 fi->fib_priority = *rta->rta_priority;
 297         if (rta->rta_mx) {
 298                 int attrlen = RTA_PAYLOAD(rta->rta_mx);
 299                 struct rtattr *attr = RTA_DATA(rta->rta_mx);
 300
 301                 while(RTA_OK(attr, attrlen)) {
 302                         unsigned flavour = attr->rta_type;
 303                         if (flavour) {
 304                                 if (flavour > RTAX_MAX)
 305                                         goto err_inval;
 306                                 fi->fib_metrics[flavour-1] = *(unsigned*)RTA_DATA(attr);
 307                         }
 308                         attr = RTA_NEXT(attr, attrlen);
 309                 }
 310         }
 311         if (rta->rta_prefsrc)
 312                 memcpy(&fi->fib_prefsrc, rta->rta_prefsrc, 2);
 313
 314         if (rta->rta_mp) {
 315                 if ((err = dn_fib_get_nhs(fi, rta->rta_mp, r)) != 0)
 316                         goto failure;
 317                 if (rta->rta_oif && fi->fib_nh->nh_oif != *rta->rta_oif)
 318                         goto err_inval;
 319                 if (rta->rta_gw && memcmp(&fi->fib_nh->nh_gw, rta->rta_gw, 2))
 320                         goto err_inval;
 321         } else {
 322                 struct dn_fib_nh *nh = fi->fib_nh;
 323                 if (rta->rta_oif)
 324                         nh->nh_oif = *rta->rta_oif;
 325                 if (rta->rta_gw)
 326                         memcpy(&nh->nh_gw, rta->rta_gw, 2);
 327                 nh->nh_flags = r->rtm_flags;
 328                 nh->nh_weight = 1;
 329         }
 330
 331         if (r->rtm_type == RTN_NAT) {
 332                 if (rta->rta_gw == NULL || nhs != 1 || rta->rta_oif)
 333                         goto err_inval;
 334                 memcpy(&fi->fib_nh->nh_gw, rta->rta_gw, 2);
 335                 goto link_it;
 336         }
 337
 338         if (dn_fib_props[r->rtm_type].error) {
 339                 if (rta->rta_gw || rta->rta_oif || rta->rta_mp)
 340                         goto err_inval;
 341                 goto link_it;
 342         }
 343
 344         if (r->rtm_scope > RT_SCOPE_HOST)
 345                 goto err_inval;
 346
 347         if (r->rtm_scope == RT_SCOPE_HOST) {
 348                 struct dn_fib_nh *nh = fi->fib_nh;
 349
 350                 /* Local address is added */
 351                 if (nhs != 1 || nh->nh_gw)
 352                         goto err_inval;
 353                 nh->nh_scope = RT_SCOPE_NOWHERE;
 354                 nh->nh_dev = dev_get_by_index(fi->fib_nh->nh_oif);
 355                 err = -ENODEV;
 356                 if (nh->nh_dev == NULL)
 357                         goto failure;
 358         } else {
 359                 change_nexthops(fi) {
 360                         if ((err = dn_fib_check_nh(r, fi, nh)) != 0)
 361                                 goto failure;
 362                 } endfor_nexthops(fi)
 363         }
 364
 365         if (fi->fib_prefsrc) {
 366                 if (r->rtm_type != RTN_LOCAL || rta->rta_dst == NULL ||
 367                     memcmp(&fi->fib_prefsrc, rta->rta_dst, 2))
 368                         if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
 369                                 goto err_inval;
 370         }
 371
 372 link_it:
 373         if ((ofi = dn_fib_find_info(fi)) != NULL) {
 374                 fi->fib_dead = 1;
 375                 dn_fib_free_info(fi);
 376                 ofi->fib_treeref++;
 377                 return ofi;
 378         }
 379
 380         fi->fib_treeref++;
 381         atomic_inc(&fi->fib_clntref);
 382         write_lock(&dn_fib_info_lock);
 383         fi->fib_next = dn_fib_info_list;
 384         fi->fib_prev = NULL;
 385         if (dn_fib_info_list)
 386                 dn_fib_info_list->fib_prev = fi;
 387         dn_fib_info_list = fi;
 388         write_unlock(&dn_fib_info_lock);
 389         return fi;
 390
 391 err_inval:
 392         err = -EINVAL;
 393
 394 failure:
 395         *errp = err;
 396         if (fi) {
 397                 fi->fib_dead = 1;
 398                 dn_fib_free_info(fi);
 399         }
 400
 401         return NULL;
 402 }
 403
 404 int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowi *fl, struct dn_fib_res *res)
 405 {
 406         int err = dn_fib_props[type].error;
 407
 408         if (err == 0) {
 409                 if (fi->fib_flags & RTNH_F_DEAD)
 410                         return 1;
 411
 412                 res->fi = fi;
 413
 414                 switch(type) {
 415                         case RTN_NAT:
 416                                 DN_FIB_RES_RESET(*res);
 417                                 atomic_inc(&fi->fib_clntref);
 418                                 return 0;
 419                         case RTN_UNICAST:
 420                         case RTN_LOCAL:
 421                                 for_nexthops(fi) {
 422                                         if (nh->nh_flags & RTNH_F_DEAD)
 423                                                 continue;
 424                                         if (!fl->oif || fl->oif == nh->nh_oif)
 425                                                 break;
 426                                 }
 427                                 if (nhsel < fi->fib_nhs) {
 428                                         res->nh_sel = nhsel;
 429                                         atomic_inc(&fi->fib_clntref);
 430                                         return 0;
 431                                 }
 432                                 endfor_nexthops(fi);
 433                                 res->fi = NULL;
 434                                 return 1;
 435                         default:
 436                                 if (net_ratelimit())
 437                                          printk("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n", type);
 438                                 res->fi = NULL;
 439                                 return -EINVAL;
 440                 }
 441         }
 442         return err;
 443 }
 444
 445 void dn_fib_select_multipath(const struct flowi *fl, struct dn_fib_res *res)
 446 {
 447         struct dn_fib_info *fi = res->fi;
 448         int w;
 449
 450         spin_lock_bh(&dn_fib_multipath_lock);
 451         if (fi->fib_power <= 0) {
 452                 int power = 0;
 453                 change_nexthops(fi) {
 454                         if (!(nh->nh_flags&RTNH_F_DEAD)) {
 455                                 power += nh->nh_weight;
 456                                 nh->nh_power = nh->nh_weight;
 457                         }
 458                 } endfor_nexthops(fi);
 459                 fi->fib_power = power;
 460                 if (power < 0) {
 461                         spin_unlock_bh(&dn_fib_multipath_lock);
 462                         res->nh_sel = 0;
 463                         return;
 464                 }
 465         }
 466
 467         w = jiffies % fi->fib_power;
 468
 469         change_nexthops(fi) {
 470                 if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
 471                         if ((w -= nh->nh_power) <= 0) {
 472                                 nh->nh_power--;
 473                                 fi->fib_power--;
 474                                 res->nh_sel = nhsel;
 475                                 spin_unlock_bh(&dn_fib_multipath_lock);
 476                                 return;
 477                         }
 478                 }
 479         } endfor_nexthops(fi);
 480         res->nh_sel = 0;
 481         spin_unlock_bh(&dn_fib_multipath_lock);
 482 }
 483
 484
 485 static int dn_fib_check_attr(struct rtmsg *r, struct rtattr **rta)
 486 {
 487         int i;
 488
 489         for(i = 1; i <= RTA_MAX; i++) {
 490                 struct rtattr *attr = rta[i-1];
 491                 if (attr) {
 492                         if (RTA_PAYLOAD(attr) < 4 && RTA_PAYLOAD(attr) != 2)
 493                                 return -EINVAL;
 494                         if (i != RTA_MULTIPATH && i != RTA_METRICS)
 495                                 rta[i-1] = (struct rtattr *)RTA_DATA(attr);
 496                 }
 497         }
 498
 499         return 0;
 500 }
 501
 502 int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 503 {
 504         struct dn_fib_table *tb;
 505         struct rtattr **rta = arg;
 506         struct rtmsg *r = NLMSG_DATA(nlh);
 507
 508         if (dn_fib_check_attr(r, rta))
 509                 return -EINVAL;
 510
 511         tb = dn_fib_get_table(r->rtm_table, 0);
 512         if (tb)
 513                 return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
 514
 515         return -ESRCH;
 516 }
 517
 518 int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 519 {
 520         struct dn_fib_table *tb;
 521         struct rtattr **rta = arg;
 522         struct rtmsg *r = NLMSG_DATA(nlh);
 523
 524         if (dn_fib_check_attr(r, rta))
 525                 return -EINVAL;
 526
 527         tb = dn_fib_get_table(r->rtm_table, 1);
 528         if (tb)
 529                 return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
 530
 531         return -ENOBUFS;
 532 }
 533
 534
 535 int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb)
 536 {
 537         int t;
 538         int s_t;
 539         struct dn_fib_table *tb;
 540
 541         if (NLMSG_PAYLOAD(cb->nlh, 0) >= sizeof(struct rtmsg) &&
 542                 ((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED)
 543                         return dn_cache_dump(skb, cb);
 544
 545         s_t = cb->args[0];
 546         if (s_t == 0)
 547                 s_t = cb->args[0] = RT_MIN_TABLE;
 548
 549         for(t = s_t; t <= RT_TABLE_MAX; t++) {
 550                 if (t < s_t)
 551                         continue;
 552                 if (t > s_t)
 553                         memset(&cb->args[1], 0,
 554                                sizeof(cb->args) - sizeof(cb->args[0]));
 555                 tb = dn_fib_get_table(t, 0);
 556                 if (tb == NULL)
 557                         continue;
 558                 if (tb->dump(tb, skb, cb) < 0)
 559                         break;
 560         }
 561
 562         cb->args[0] = t;
 563
 564         return skb->len;
 565 }
 566
 567 static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
 568 {
 569         struct dn_fib_table *tb;
 570         struct {
 571                 struct nlmsghdr nlh;
 572                 struct rtmsg rtm;
 573         } req;
 574         struct dn_kern_rta rta;
 575
 576         memset(&req.rtm, 0, sizeof(req.rtm));
 577         memset(&rta, 0, sizeof(rta));
 578
 579         if (type == RTN_UNICAST)
 580                 tb = dn_fib_get_table(RT_MIN_TABLE, 1);
 581         else
 582                 tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
 583
 584         if (tb == NULL)
 585                 return;
 586
 587         req.nlh.nlmsg_len = sizeof(req);
 588         req.nlh.nlmsg_type = cmd;
 589         req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
 590         req.nlh.nlmsg_pid = 0;
 591         req.nlh.nlmsg_seq = 0;
 592
 593         req.rtm.rtm_dst_len = dst_len;
 594         req.rtm.rtm_table = tb->n;
 595         req.rtm.rtm_protocol = RTPROT_KERNEL;
 596         req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
 597         req.rtm.rtm_type = type;
 598
 599         rta.rta_dst = &dst;
 600         rta.rta_prefsrc = &ifa->ifa_local;
 601         rta.rta_oif = &ifa->ifa_dev->dev->ifindex;
 602
 603         if (cmd == RTM_NEWROUTE)
 604                 tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL);
 605         else
 606                 tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL);
 607 }
 608
 609 static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
 610 {
 611
 612         fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
 613
 614 #if 0
 615         if (!(dev->flags&IFF_UP))
 616                 return;
 617         /* In the future, we will want to add default routes here */
 618
 619 #endif
 620 }
 621
 622 static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
 623 {
 624         int found_it = 0;
 625         struct net_device *dev;
 626         struct dn_dev *dn_db;
 627         struct dn_ifaddr *ifa2;
 628
 629         ASSERT_RTNL();
 630
 631         /* Scan device list */
 632         read_lock(&dev_base_lock);
 633         for(dev = dev_base; dev; dev = dev->next) {
 634                 dn_db = dev->dn_ptr;
 635                 if (dn_db == NULL)
 636                         continue;
 637                 for(ifa2 = dn_db->ifa_list; ifa2; ifa2 = ifa2->ifa_next) {
 638                         if (ifa2->ifa_local == ifa->ifa_local) {
 639                                 found_it = 1;
 640                                 break;
 641                         }
 642                 }
 643         }
 644         read_unlock(&dev_base_lock);
 645
 646         if (found_it == 0) {
 647                 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
 648
 649                 if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
 650                         if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
 651                                 dn_fib_flush();
 652                 }
 653         }
 654 }
 655
 656 static void dn_fib_disable_addr(struct net_device *dev, int force)
 657 {
 658         if (dn_fib_sync_down(0, dev, force))
 659                 dn_fib_flush();
 660         dn_rt_cache_flush(0);
 661         neigh_ifdown(&dn_neigh_table, dev);
 662 }
 663
 664 static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
 665 {
 666         struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
 667
 668         switch(event) {
 669                 case NETDEV_UP:
 670                         dn_fib_add_ifaddr(ifa);
 671                         dn_fib_sync_up(ifa->ifa_dev->dev);
 672                         dn_rt_cache_flush(-1);
 673                         break;
 674                 case NETDEV_DOWN:
 675                         dn_fib_del_ifaddr(ifa);
 676                         if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
 677                                 dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
 678                         } else {
 679                                 dn_rt_cache_flush(-1);
 680                         }
 681                         break;
 682         }
 683         return NOTIFY_DONE;
 684 }
 685
 686 int dn_fib_sync_down(__le16 local, struct net_device *dev, int force)
 687 {
 688         int ret = 0;
 689         int scope = RT_SCOPE_NOWHERE;
 690
 691         if (force)
 692                 scope = -1;
 693
 694         for_fib_info() {
 695                 /*
 696                  * This makes no sense for DECnet.... we will almost
 697                  * certainly have more than one local address the same
 698                  * over all our interfaces. It needs thinking about
 699                  * some more.
 700                  */
 701                 if (local && fi->fib_prefsrc == local) {
 702                         fi->fib_flags |= RTNH_F_DEAD;
 703                         ret++;
 704                 } else if (dev && fi->fib_nhs) {
 705                         int dead = 0;
 706
 707                         change_nexthops(fi) {
 708                                 if (nh->nh_flags&RTNH_F_DEAD)
 709                                         dead++;
 710                                 else if (nh->nh_dev == dev &&
 711                                                 nh->nh_scope != scope) {
 712                                         spin_lock_bh(&dn_fib_multipath_lock);
 713                                         nh->nh_flags |= RTNH_F_DEAD;
 714                                         fi->fib_power -= nh->nh_power;
 715                                         nh->nh_power = 0;
 716                                         spin_unlock_bh(&dn_fib_multipath_lock);
 717                                         dead++;
 718                                 }
 719                         } endfor_nexthops(fi)
 720                         if (dead == fi->fib_nhs) {
 721                                 fi->fib_flags |= RTNH_F_DEAD;
 722                                 ret++;
 723                         }
 724                 }
 725         } endfor_fib_info();
 726         return ret;
 727 }
 728
 729
 730 int dn_fib_sync_up(struct net_device *dev)
 731 {
 732         int ret = 0;
 733
 734         if (!(dev->flags&IFF_UP))
 735                 return 0;
 736
 737         for_fib_info() {
 738                 int alive = 0;
 739
 740                 change_nexthops(fi) {
 741                         if (!(nh->nh_flags&RTNH_F_DEAD)) {
 742                                 alive++;
 743                                 continue;
 744                         }
 745                         if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
 746                                 continue;
 747                         if (nh->nh_dev != dev || dev->dn_ptr == NULL)
 748                                 continue;
 749                         alive++;
 750                         spin_lock_bh(&dn_fib_multipath_lock);
 751                         nh->nh_power = 0;
 752                         nh->nh_flags &= ~RTNH_F_DEAD;
 753                         spin_unlock_bh(&dn_fib_multipath_lock);
 754                 } endfor_nexthops(fi);
 755
 756                 if (alive > 0) {
 757                         fi->fib_flags &= ~RTNH_F_DEAD;
 758                         ret++;
 759                 }
 760         } endfor_fib_info();
 761         return ret;
 762 }
 763
 764 void dn_fib_flush(void)
 765 {
 766         int flushed = 0;
 767         struct dn_fib_table *tb;
 768         int id;
 769
 770         for(id = RT_TABLE_MAX; id > 0; id--) {
 771                 if ((tb = dn_fib_get_table(id, 0)) == NULL)
 772                         continue;
 773                 flushed += tb->flush(tb);
 774         }
 775
 776         if (flushed)
 777                 dn_rt_cache_flush(-1);
 778 }
 779
 780 static struct notifier_block dn_fib_dnaddr_notifier = {
 781         .notifier_call = dn_fib_dnaddr_event,
 782 };
 783
 784 void __exit dn_fib_cleanup(void)
 785 {
 786         dn_fib_table_cleanup();
 787         dn_fib_rules_cleanup();
 788
 789         unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
 790 }
 791
 792
 793 void __init dn_fib_init(void)
 794 {
 795
 796         dn_fib_table_init();
 797         dn_fib_rules_init();
 798
 799         register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
 800 }
 801
 802