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 extern int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb);
  59
  60 static DEFINE_SPINLOCK(dn_fib_multipath_lock);
  61 static struct dn_fib_info *dn_fib_info_list;
  62 static DEFINE_SPINLOCK(dn_fib_info_lock);
  63
  64 static struct
  65 {
  66         int error;
  67         u8 scope;
  68 } dn_fib_props[RTA_MAX+1] = {
  69         [RTN_UNSPEC] =      { .error = 0,       .scope = RT_SCOPE_NOWHERE },
  70         [RTN_UNICAST] =     { .error = 0,       .scope = RT_SCOPE_UNIVERSE },
  71         [RTN_LOCAL] =       { .error = 0,       .scope = RT_SCOPE_HOST },
  72         [RTN_BROADCAST] =   { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
  73         [RTN_ANYCAST] =     { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
  74         [RTN_MULTICAST] =   { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
  75         [RTN_BLACKHOLE] =   { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE },
  76         [RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE },
  77         [RTN_PROHIBIT] =    { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE },
  78         [RTN_THROW] =       { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE },
  79         [RTN_NAT] =         { .error = 0,       .scope = RT_SCOPE_NOWHERE },
  80         [RTN_XRESOLVE] =    { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
  81 };
  82
  83 void dn_fib_free_info(struct dn_fib_info *fi)
  84 {
  85         if (fi->fib_dead == 0) {
  86                 printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n");
  87                 return;
  88         }
  89
  90         change_nexthops(fi) {
  91                 if (nh->nh_dev)
  92                         dev_put(nh->nh_dev);
  93                 nh->nh_dev = NULL;
  94         } endfor_nexthops(fi);
  95         kfree(fi);
  96 }
  97
  98 void dn_fib_release_info(struct dn_fib_info *fi)
  99 {
 100         spin_lock(&dn_fib_info_lock);
 101         if (fi && --fi->fib_treeref == 0) {
 102                 if (fi->fib_next)
 103                         fi->fib_next->fib_prev = fi->fib_prev;
 104                 if (fi->fib_prev)
 105                         fi->fib_prev->fib_next = fi->fib_next;
 106                 if (fi == dn_fib_info_list)
 107                         dn_fib_info_list = fi->fib_next;
 108                 fi->fib_dead = 1;
 109                 dn_fib_info_put(fi);
 110         }
 111         spin_unlock(&dn_fib_info_lock);
 112 }
 113
 114 static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi)
 115 {
 116         const struct dn_fib_nh *onh = ofi->fib_nh;
 117
 118         for_nexthops(fi) {
 119                 if (nh->nh_oif != onh->nh_oif ||
 120                         nh->nh_gw != onh->nh_gw ||
 121                         nh->nh_scope != onh->nh_scope ||
 122                         nh->nh_weight != onh->nh_weight ||
 123                         ((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD))
 124                                 return -1;
 125                 onh++;
 126         } endfor_nexthops(fi);
 127         return 0;
 128 }
 129
 130 static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi)
 131 {
 132         for_fib_info() {
 133                 if (fi->fib_nhs != nfi->fib_nhs)
 134                         continue;
 135                 if (nfi->fib_protocol == fi->fib_protocol &&
 136                         nfi->fib_prefsrc == fi->fib_prefsrc &&
 137                         nfi->fib_priority == fi->fib_priority &&
 138                         memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 &&
 139                         ((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 &&
 140                         (nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0))
 141                                 return fi;
 142         } endfor_fib_info();
 143         return NULL;
 144 }
 145
 146 __le16 dn_fib_get_attr16(struct rtattr *attr, int attrlen, int type)
 147 {
 148         while(RTA_OK(attr,attrlen)) {
 149                 if (attr->rta_type == type)
 150                         return *(__le16*)RTA_DATA(attr);
 151                 attr = RTA_NEXT(attr, attrlen);
 152         }
 153
 154         return 0;
 155 }
 156
 157 static int dn_fib_count_nhs(struct rtattr *rta)
 158 {
 159         int nhs = 0;
 160         struct rtnexthop *nhp = RTA_DATA(rta);
 161         int nhlen = RTA_PAYLOAD(rta);
 162
 163         while(nhlen >= (int)sizeof(struct rtnexthop)) {
 164                 if ((nhlen -= nhp->rtnh_len) < 0)
 165                         return 0;
 166                 nhs++;
 167                 nhp = RTNH_NEXT(nhp);
 168         }
 169
 170         return nhs;
 171 }
 172
 173 static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct rtattr *rta, const struct rtmsg *r)
 174 {
 175         struct rtnexthop *nhp = RTA_DATA(rta);
 176         int nhlen = RTA_PAYLOAD(rta);
 177
 178         change_nexthops(fi) {
 179                 int attrlen = nhlen - sizeof(struct rtnexthop);
 180                 if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
 181                         return -EINVAL;
 182
 183                 nh->nh_flags  = (r->rtm_flags&~0xFF) | nhp->rtnh_flags;
 184                 nh->nh_oif    = nhp->rtnh_ifindex;
 185                 nh->nh_weight = nhp->rtnh_hops + 1;
 186
 187                 if (attrlen) {
 188                         nh->nh_gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
 189                 }
 190                 nhp = RTNH_NEXT(nhp);
 191         } endfor_nexthops(fi);
 192
 193         return 0;
 194 }
 195
 196
 197 static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh)
 198 {
 199         int err;
 200
 201         if (nh->nh_gw) {
 202                 struct flowi fl;
 203                 struct dn_fib_res res;
 204
 205                 memset(&fl, 0, sizeof(fl));
 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(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(&fl, 0, sizeof(fl));
 225                 fl.fld_dst = nh->nh_gw;
 226                 fl.oif = nh->nh_oif;
 227                 fl.fld_scope = r->rtm_scope + 1;
 228
 229                 if (fl.fld_scope < RT_SCOPE_LINK)
 230                         fl.fld_scope = RT_SCOPE_LINK;
 231
 232                 if ((err = dn_fib_lookup(&fl, &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;
 248 out:
 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(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
 271 struct 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 (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
 279                 goto err_inval;
 280
 281         if (rta->rta_mp) {
 282                 nhs = dn_fib_count_nhs(rta->rta_mp);
 283                 if (nhs == 0)
 284                         goto err_inval;
 285         }
 286
 287         fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
 288         err = -ENOBUFS;
 289         if (fi == NULL)
 290                 goto failure;
 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         spin_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         spin_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                             i != RTA_TABLE)
 496                                 rta[i-1] = (struct rtattr *)RTA_DATA(attr);
 497                 }
 498         }
 499
 500         return 0;
 501 }
 502
 503 int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 504 {
 505         struct dn_fib_table *tb;
 506         struct rtattr **rta = arg;
 507         struct rtmsg *r = NLMSG_DATA(nlh);
 508
 509         if (dn_fib_check_attr(r, rta))
 510                 return -EINVAL;
 511
 512         tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 0);
 513         if (tb)
 514                 return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
 515
 516         return -ESRCH;
 517 }
 518
 519 int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 520 {
 521         struct dn_fib_table *tb;
 522         struct rtattr **rta = arg;
 523         struct rtmsg *r = NLMSG_DATA(nlh);
 524
 525         if (dn_fib_check_attr(r, rta))
 526                 return -EINVAL;
 527
 528         tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 1);
 529         if (tb)
 530                 return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
 531
 532         return -ENOBUFS;
 533 }
 534
 535 static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
 536 {
 537         struct dn_fib_table *tb;
 538         struct {
 539                 struct nlmsghdr nlh;
 540                 struct rtmsg rtm;
 541         } req;
 542         struct dn_kern_rta rta;
 543
 544         memset(&req.rtm, 0, sizeof(req.rtm));
 545         memset(&rta, 0, sizeof(rta));
 546
 547         if (type == RTN_UNICAST)
 548                 tb = dn_fib_get_table(RT_MIN_TABLE, 1);
 549         else
 550                 tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
 551
 552         if (tb == NULL)
 553                 return;
 554
 555         req.nlh.nlmsg_len = sizeof(req);
 556         req.nlh.nlmsg_type = cmd;
 557         req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
 558         req.nlh.nlmsg_pid = 0;
 559         req.nlh.nlmsg_seq = 0;
 560
 561         req.rtm.rtm_dst_len = dst_len;
 562         req.rtm.rtm_table = tb->n;
 563         req.rtm.rtm_protocol = RTPROT_KERNEL;
 564         req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
 565         req.rtm.rtm_type = type;
 566
 567         rta.rta_dst = &dst;
 568         rta.rta_prefsrc = &ifa->ifa_local;
 569         rta.rta_oif = &ifa->ifa_dev->dev->ifindex;
 570
 571         if (cmd == RTM_NEWROUTE)
 572                 tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL);
 573         else
 574                 tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL);
 575 }
 576
 577 static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
 578 {
 579
 580         fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
 581
 582 #if 0
 583         if (!(dev->flags&IFF_UP))
 584                 return;
 585         /* In the future, we will want to add default routes here */
 586
 587 #endif
 588 }
 589
 590 static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
 591 {
 592         int found_it = 0;
 593         struct net_device *dev;
 594         struct dn_dev *dn_db;
 595         struct dn_ifaddr *ifa2;
 596
 597         ASSERT_RTNL();
 598
 599         /* Scan device list */
 600         read_lock(&dev_base_lock);
 601         for(dev = dev_base; dev; dev = dev->next) {
 602                 dn_db = dev->dn_ptr;
 603                 if (dn_db == NULL)
 604                         continue;
 605                 for(ifa2 = dn_db->ifa_list; ifa2; ifa2 = ifa2->ifa_next) {
 606                         if (ifa2->ifa_local == ifa->ifa_local) {
 607                                 found_it = 1;
 608                                 break;
 609                         }
 610                 }
 611         }
 612         read_unlock(&dev_base_lock);
 613
 614         if (found_it == 0) {
 615                 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
 616
 617                 if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
 618                         if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
 619                                 dn_fib_flush();
 620                 }
 621         }
 622 }
 623
 624 static void dn_fib_disable_addr(struct net_device *dev, int force)
 625 {
 626         if (dn_fib_sync_down(0, dev, force))
 627                 dn_fib_flush();
 628         dn_rt_cache_flush(0);
 629         neigh_ifdown(&dn_neigh_table, dev);
 630 }
 631
 632 static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
 633 {
 634         struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
 635
 636         switch(event) {
 637                 case NETDEV_UP:
 638                         dn_fib_add_ifaddr(ifa);
 639                         dn_fib_sync_up(ifa->ifa_dev->dev);
 640                         dn_rt_cache_flush(-1);
 641                         break;
 642                 case NETDEV_DOWN:
 643                         dn_fib_del_ifaddr(ifa);
 644                         if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
 645                                 dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
 646                         } else {
 647                                 dn_rt_cache_flush(-1);
 648                         }
 649                         break;
 650         }
 651         return NOTIFY_DONE;
 652 }
 653
 654 int dn_fib_sync_down(__le16 local, struct net_device *dev, int force)
 655 {
 656         int ret = 0;
 657         int scope = RT_SCOPE_NOWHERE;
 658
 659         if (force)
 660                 scope = -1;
 661
 662         for_fib_info() {
 663                 /*
 664                  * This makes no sense for DECnet.... we will almost
 665                  * certainly have more than one local address the same
 666                  * over all our interfaces. It needs thinking about
 667                  * some more.
 668                  */
 669                 if (local && fi->fib_prefsrc == local) {
 670                         fi->fib_flags |= RTNH_F_DEAD;
 671                         ret++;
 672                 } else if (dev && fi->fib_nhs) {
 673                         int dead = 0;
 674
 675                         change_nexthops(fi) {
 676                                 if (nh->nh_flags&RTNH_F_DEAD)
 677                                         dead++;
 678                                 else if (nh->nh_dev == dev &&
 679                                                 nh->nh_scope != scope) {
 680                                         spin_lock_bh(&dn_fib_multipath_lock);
 681                                         nh->nh_flags |= RTNH_F_DEAD;
 682                                         fi->fib_power -= nh->nh_power;
 683                                         nh->nh_power = 0;
 684                                         spin_unlock_bh(&dn_fib_multipath_lock);
 685                                         dead++;
 686                                 }
 687                         } endfor_nexthops(fi)
 688                         if (dead == fi->fib_nhs) {
 689                                 fi->fib_flags |= RTNH_F_DEAD;
 690                                 ret++;
 691                         }
 692                 }
 693         } endfor_fib_info();
 694         return ret;
 695 }
 696
 697
 698 int dn_fib_sync_up(struct net_device *dev)
 699 {
 700         int ret = 0;
 701
 702         if (!(dev->flags&IFF_UP))
 703                 return 0;
 704
 705         for_fib_info() {
 706                 int alive = 0;
 707
 708                 change_nexthops(fi) {
 709                         if (!(nh->nh_flags&RTNH_F_DEAD)) {
 710                                 alive++;
 711                                 continue;
 712                         }
 713                         if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
 714                                 continue;
 715                         if (nh->nh_dev != dev || dev->dn_ptr == NULL)
 716                                 continue;
 717                         alive++;
 718                         spin_lock_bh(&dn_fib_multipath_lock);
 719                         nh->nh_power = 0;
 720                         nh->nh_flags &= ~RTNH_F_DEAD;
 721                         spin_unlock_bh(&dn_fib_multipath_lock);
 722                 } endfor_nexthops(fi);
 723
 724                 if (alive > 0) {
 725                         fi->fib_flags &= ~RTNH_F_DEAD;
 726                         ret++;
 727                 }
 728         } endfor_fib_info();
 729         return ret;
 730 }
 731
 732 static struct notifier_block dn_fib_dnaddr_notifier = {
 733         .notifier_call = dn_fib_dnaddr_event,
 734 };
 735
 736 void __exit dn_fib_cleanup(void)
 737 {
 738         dn_fib_table_cleanup();
 739         dn_fib_rules_cleanup();
 740
 741         unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
 742 }
 743
 744
 745 void __init dn_fib_init(void)
 746 {
 747
 748         dn_fib_table_init();
 749         dn_fib_rules_init();
 750
 751         register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
 752 }
 753
 754