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TOMOYO Linux Cross Reference
Linux/net/decnet/dn_fib.c

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  1 /*
  2  * DECnet       An implementation of the DECnet protocol suite for the LINUX
  3  *              operating system.  DECnet is implemented using the  BSD Socket
  4  *              interface as the means of communication with the user level.
  5  *
  6  *              DECnet Routing Forwarding Information Base (Glue/Info List)
  7  *
  8  * Author:      Steve Whitehouse <SteveW@ACM.org>
  9  *
 10  *
 11  * Changes:
 12  *              Alexey Kuznetsov : SMP locking changes
 13  *              Steve Whitehouse : Rewrote it... Well to be more correct, I
 14  *                                 copied most of it from the ipv4 fib code.
 15  *              Steve Whitehouse : Updated it in style and fixed a few bugs
 16  *                                 which were fixed in the ipv4 code since
 17  *                                 this code was copied from it.
 18  *
 19  */
 20 #include <linux/string.h>
 21 #include <linux/net.h>
 22 #include <linux/socket.h>
 23 #include <linux/slab.h>
 24 #include <linux/sockios.h>
 25 #include <linux/init.h>
 26 #include <linux/skbuff.h>
 27 #include <linux/netlink.h>
 28 #include <linux/rtnetlink.h>
 29 #include <linux/proc_fs.h>
 30 #include <linux/netdevice.h>
 31 #include <linux/timer.h>
 32 #include <linux/spinlock.h>
 33 #include <linux/atomic.h>
 34 #include <asm/uaccess.h>
 35 #include <net/neighbour.h>
 36 #include <net/dst.h>
 37 #include <net/flow.h>
 38 #include <net/fib_rules.h>
 39 #include <net/dn.h>
 40 #include <net/dn_route.h>
 41 #include <net/dn_fib.h>
 42 #include <net/dn_neigh.h>
 43 #include <net/dn_dev.h>
 44 
 45 #define RT_MIN_TABLE 1
 46 
 47 #define for_fib_info() { struct dn_fib_info *fi;\
 48         for(fi = dn_fib_info_list; fi; fi = fi->fib_next)
 49 #define endfor_fib_info() }
 50 
 51 #define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
 52         for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
 53 
 54 #define change_nexthops(fi) { int nhsel; struct dn_fib_nh *nh;\
 55         for(nhsel = 0, nh = (struct dn_fib_nh *)((fi)->fib_nh); nhsel < (fi)->fib_nhs; nh++, nhsel++)
 56 
 57 #define endfor_nexthops(fi) }
 58 
 59 static DEFINE_SPINLOCK(dn_fib_multipath_lock);
 60 static struct dn_fib_info *dn_fib_info_list;
 61 static DEFINE_SPINLOCK(dn_fib_info_lock);
 62 
 63 static struct
 64 {
 65         int error;
 66         u8 scope;
 67 } dn_fib_props[RTN_MAX+1] = {
 68         [RTN_UNSPEC] =      { .error = 0,       .scope = RT_SCOPE_NOWHERE },
 69         [RTN_UNICAST] =     { .error = 0,       .scope = RT_SCOPE_UNIVERSE },
 70         [RTN_LOCAL] =       { .error = 0,       .scope = RT_SCOPE_HOST },
 71         [RTN_BROADCAST] =   { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
 72         [RTN_ANYCAST] =     { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
 73         [RTN_MULTICAST] =   { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
 74         [RTN_BLACKHOLE] =   { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE },
 75         [RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE },
 76         [RTN_PROHIBIT] =    { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE },
 77         [RTN_THROW] =       { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE },
 78         [RTN_NAT] =         { .error = 0,       .scope = RT_SCOPE_NOWHERE },
 79         [RTN_XRESOLVE] =    { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
 80 };
 81 
 82 static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force);
 83 static int dn_fib_sync_up(struct net_device *dev);
 84 
 85 void dn_fib_free_info(struct dn_fib_info *fi)
 86 {
 87         if (fi->fib_dead == 0) {
 88                 printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n");
 89                 return;
 90         }
 91 
 92         change_nexthops(fi) {
 93                 if (nh->nh_dev)
 94                         dev_put(nh->nh_dev);
 95                 nh->nh_dev = NULL;
 96         } endfor_nexthops(fi);
 97         kfree(fi);
 98 }
 99 
100 void dn_fib_release_info(struct dn_fib_info *fi)
101 {
102         spin_lock(&dn_fib_info_lock);
103         if (fi && --fi->fib_treeref == 0) {
104                 if (fi->fib_next)
105                         fi->fib_next->fib_prev = fi->fib_prev;
106                 if (fi->fib_prev)
107                         fi->fib_prev->fib_next = fi->fib_next;
108                 if (fi == dn_fib_info_list)
109                         dn_fib_info_list = fi->fib_next;
110                 fi->fib_dead = 1;
111                 dn_fib_info_put(fi);
112         }
113         spin_unlock(&dn_fib_info_lock);
114 }
115 
116 static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi)
117 {
118         const struct dn_fib_nh *onh = ofi->fib_nh;
119 
120         for_nexthops(fi) {
121                 if (nh->nh_oif != onh->nh_oif ||
122                         nh->nh_gw != onh->nh_gw ||
123                         nh->nh_scope != onh->nh_scope ||
124                         nh->nh_weight != onh->nh_weight ||
125                         ((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD))
126                                 return -1;
127                 onh++;
128         } endfor_nexthops(fi);
129         return 0;
130 }
131 
132 static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi)
133 {
134         for_fib_info() {
135                 if (fi->fib_nhs != nfi->fib_nhs)
136                         continue;
137                 if (nfi->fib_protocol == fi->fib_protocol &&
138                         nfi->fib_prefsrc == fi->fib_prefsrc &&
139                         nfi->fib_priority == fi->fib_priority &&
140                         memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 &&
141                         ((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 &&
142                         (nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0))
143                                 return fi;
144         } endfor_fib_info();
145         return NULL;
146 }
147 
148 __le16 dn_fib_get_attr16(struct rtattr *attr, int attrlen, int type)
149 {
150         while(RTA_OK(attr,attrlen)) {
151                 if (attr->rta_type == type)
152                         return *(__le16*)RTA_DATA(attr);
153                 attr = RTA_NEXT(attr, attrlen);
154         }
155 
156         return 0;
157 }
158 
159 static int dn_fib_count_nhs(struct rtattr *rta)
160 {
161         int nhs = 0;
162         struct rtnexthop *nhp = RTA_DATA(rta);
163         int nhlen = RTA_PAYLOAD(rta);
164 
165         while(nhlen >= (int)sizeof(struct rtnexthop)) {
166                 if ((nhlen -= nhp->rtnh_len) < 0)
167                         return 0;
168                 nhs++;
169                 nhp = RTNH_NEXT(nhp);
170         }
171 
172         return nhs;
173 }
174 
175 static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct rtattr *rta, const struct rtmsg *r)
176 {
177         struct rtnexthop *nhp = RTA_DATA(rta);
178         int nhlen = RTA_PAYLOAD(rta);
179 
180         change_nexthops(fi) {
181                 int attrlen = nhlen - sizeof(struct rtnexthop);
182                 if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
183                         return -EINVAL;
184 
185                 nh->nh_flags  = (r->rtm_flags&~0xFF) | nhp->rtnh_flags;
186                 nh->nh_oif    = nhp->rtnh_ifindex;
187                 nh->nh_weight = nhp->rtnh_hops + 1;
188 
189                 if (attrlen) {
190                         nh->nh_gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
191                 }
192                 nhp = RTNH_NEXT(nhp);
193         } endfor_nexthops(fi);
194 
195         return 0;
196 }
197 
198 
199 static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh)
200 {
201         int err;
202 
203         if (nh->nh_gw) {
204                 struct flowidn fld;
205                 struct dn_fib_res res;
206 
207                 if (nh->nh_flags&RTNH_F_ONLINK) {
208                         struct net_device *dev;
209 
210                         if (r->rtm_scope >= RT_SCOPE_LINK)
211                                 return -EINVAL;
212                         if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST)
213                                 return -EINVAL;
214                         if ((dev = __dev_get_by_index(&init_net, nh->nh_oif)) == NULL)
215                                 return -ENODEV;
216                         if (!(dev->flags&IFF_UP))
217                                 return -ENETDOWN;
218                         nh->nh_dev = dev;
219                         dev_hold(dev);
220                         nh->nh_scope = RT_SCOPE_LINK;
221                         return 0;
222                 }
223 
224                 memset(&fld, 0, sizeof(fld));
225                 fld.daddr = nh->nh_gw;
226                 fld.flowidn_oif = nh->nh_oif;
227                 fld.flowidn_scope = r->rtm_scope + 1;
228 
229                 if (fld.flowidn_scope < RT_SCOPE_LINK)
230                         fld.flowidn_scope = RT_SCOPE_LINK;
231 
232                 if ((err = dn_fib_lookup(&fld, &res)) != 0)
233                         return err;
234 
235                 err = -EINVAL;
236                 if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
237                         goto out;
238                 nh->nh_scope = res.scope;
239                 nh->nh_oif = DN_FIB_RES_OIF(res);
240                 nh->nh_dev = DN_FIB_RES_DEV(res);
241                 if (nh->nh_dev == NULL)
242                         goto out;
243                 dev_hold(nh->nh_dev);
244                 err = -ENETDOWN;
245                 if (!(nh->nh_dev->flags & IFF_UP))
246                         goto out;
247                 err = 0;
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(&init_net, nh->nh_oif);
258                 if (dev == NULL || dev->dn_ptr == NULL)
259                         return -ENODEV;
260                 if (!(dev->flags&IFF_UP))
261                         return -ENETDOWN;
262                 nh->nh_dev = dev;
263                 dev_hold(nh->nh_dev);
264                 nh->nh_scope = RT_SCOPE_HOST;
265         }
266 
267         return 0;
268 }
269 
270 
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 (r->rtm_type > RTN_MAX)
279                 goto err_inval;
280 
281         if (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
282                 goto err_inval;
283 
284         if (rta->rta_mp) {
285                 nhs = dn_fib_count_nhs(rta->rta_mp);
286                 if (nhs == 0)
287                         goto err_inval;
288         }
289 
290         fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
291         err = -ENOBUFS;
292         if (fi == NULL)
293                 goto failure;
294 
295         fi->fib_protocol = r->rtm_protocol;
296         fi->fib_nhs = nhs;
297         fi->fib_flags = r->rtm_flags;
298         if (rta->rta_priority)
299                 fi->fib_priority = *rta->rta_priority;
300         if (rta->rta_mx) {
301                 int attrlen = RTA_PAYLOAD(rta->rta_mx);
302                 struct rtattr *attr = RTA_DATA(rta->rta_mx);
303 
304                 while(RTA_OK(attr, attrlen)) {
305                         unsigned int flavour = attr->rta_type;
306 
307                         if (flavour) {
308                                 if (flavour > RTAX_MAX)
309                                         goto err_inval;
310                                 fi->fib_metrics[flavour-1] = *(unsigned int *)RTA_DATA(attr);
311                         }
312                         attr = RTA_NEXT(attr, attrlen);
313                 }
314         }
315         if (rta->rta_prefsrc)
316                 memcpy(&fi->fib_prefsrc, rta->rta_prefsrc, 2);
317 
318         if (rta->rta_mp) {
319                 if ((err = dn_fib_get_nhs(fi, rta->rta_mp, r)) != 0)
320                         goto failure;
321                 if (rta->rta_oif && fi->fib_nh->nh_oif != *rta->rta_oif)
322                         goto err_inval;
323                 if (rta->rta_gw && memcmp(&fi->fib_nh->nh_gw, rta->rta_gw, 2))
324                         goto err_inval;
325         } else {
326                 struct dn_fib_nh *nh = fi->fib_nh;
327                 if (rta->rta_oif)
328                         nh->nh_oif = *rta->rta_oif;
329                 if (rta->rta_gw)
330                         memcpy(&nh->nh_gw, rta->rta_gw, 2);
331                 nh->nh_flags = r->rtm_flags;
332                 nh->nh_weight = 1;
333         }
334 
335         if (r->rtm_type == RTN_NAT) {
336                 if (rta->rta_gw == NULL || nhs != 1 || rta->rta_oif)
337                         goto err_inval;
338                 memcpy(&fi->fib_nh->nh_gw, rta->rta_gw, 2);
339                 goto link_it;
340         }
341 
342         if (dn_fib_props[r->rtm_type].error) {
343                 if (rta->rta_gw || rta->rta_oif || rta->rta_mp)
344                         goto err_inval;
345                 goto link_it;
346         }
347 
348         if (r->rtm_scope > RT_SCOPE_HOST)
349                 goto err_inval;
350 
351         if (r->rtm_scope == RT_SCOPE_HOST) {
352                 struct dn_fib_nh *nh = fi->fib_nh;
353 
354                 /* Local address is added */
355                 if (nhs != 1 || nh->nh_gw)
356                         goto err_inval;
357                 nh->nh_scope = RT_SCOPE_NOWHERE;
358                 nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif);
359                 err = -ENODEV;
360                 if (nh->nh_dev == NULL)
361                         goto failure;
362         } else {
363                 change_nexthops(fi) {
364                         if ((err = dn_fib_check_nh(r, fi, nh)) != 0)
365                                 goto failure;
366                 } endfor_nexthops(fi)
367         }
368 
369         if (fi->fib_prefsrc) {
370                 if (r->rtm_type != RTN_LOCAL || rta->rta_dst == NULL ||
371                     memcmp(&fi->fib_prefsrc, rta->rta_dst, 2))
372                         if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
373                                 goto err_inval;
374         }
375 
376 link_it:
377         if ((ofi = dn_fib_find_info(fi)) != NULL) {
378                 fi->fib_dead = 1;
379                 dn_fib_free_info(fi);
380                 ofi->fib_treeref++;
381                 return ofi;
382         }
383 
384         fi->fib_treeref++;
385         atomic_inc(&fi->fib_clntref);
386         spin_lock(&dn_fib_info_lock);
387         fi->fib_next = dn_fib_info_list;
388         fi->fib_prev = NULL;
389         if (dn_fib_info_list)
390                 dn_fib_info_list->fib_prev = fi;
391         dn_fib_info_list = fi;
392         spin_unlock(&dn_fib_info_lock);
393         return fi;
394 
395 err_inval:
396         err = -EINVAL;
397 
398 failure:
399         *errp = err;
400         if (fi) {
401                 fi->fib_dead = 1;
402                 dn_fib_free_info(fi);
403         }
404 
405         return NULL;
406 }
407 
408 int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowidn *fld, struct dn_fib_res *res)
409 {
410         int err = dn_fib_props[type].error;
411 
412         if (err == 0) {
413                 if (fi->fib_flags & RTNH_F_DEAD)
414                         return 1;
415 
416                 res->fi = fi;
417 
418                 switch (type) {
419                 case RTN_NAT:
420                         DN_FIB_RES_RESET(*res);
421                         atomic_inc(&fi->fib_clntref);
422                         return 0;
423                 case RTN_UNICAST:
424                 case RTN_LOCAL:
425                         for_nexthops(fi) {
426                                 if (nh->nh_flags & RTNH_F_DEAD)
427                                         continue;
428                                 if (!fld->flowidn_oif ||
429                                     fld->flowidn_oif == nh->nh_oif)
430                                         break;
431                         }
432                         if (nhsel < fi->fib_nhs) {
433                                 res->nh_sel = nhsel;
434                                 atomic_inc(&fi->fib_clntref);
435                                 return 0;
436                         }
437                         endfor_nexthops(fi);
438                         res->fi = NULL;
439                         return 1;
440                 default:
441                         net_err_ratelimited("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n",
442                                             type);
443                         res->fi = NULL;
444                         return -EINVAL;
445                 }
446         }
447         return err;
448 }
449 
450 void dn_fib_select_multipath(const struct flowidn *fld, struct dn_fib_res *res)
451 {
452         struct dn_fib_info *fi = res->fi;
453         int w;
454 
455         spin_lock_bh(&dn_fib_multipath_lock);
456         if (fi->fib_power <= 0) {
457                 int power = 0;
458                 change_nexthops(fi) {
459                         if (!(nh->nh_flags&RTNH_F_DEAD)) {
460                                 power += nh->nh_weight;
461                                 nh->nh_power = nh->nh_weight;
462                         }
463                 } endfor_nexthops(fi);
464                 fi->fib_power = power;
465                 if (power < 0) {
466                         spin_unlock_bh(&dn_fib_multipath_lock);
467                         res->nh_sel = 0;
468                         return;
469                 }
470         }
471 
472         w = jiffies % fi->fib_power;
473 
474         change_nexthops(fi) {
475                 if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
476                         if ((w -= nh->nh_power) <= 0) {
477                                 nh->nh_power--;
478                                 fi->fib_power--;
479                                 res->nh_sel = nhsel;
480                                 spin_unlock_bh(&dn_fib_multipath_lock);
481                                 return;
482                         }
483                 }
484         } endfor_nexthops(fi);
485         res->nh_sel = 0;
486         spin_unlock_bh(&dn_fib_multipath_lock);
487 }
488 
489 
490 static int dn_fib_check_attr(struct rtmsg *r, struct rtattr **rta)
491 {
492         int i;
493 
494         for(i = 1; i <= RTA_MAX; i++) {
495                 struct rtattr *attr = rta[i-1];
496                 if (attr) {
497                         if (RTA_PAYLOAD(attr) < 4 && RTA_PAYLOAD(attr) != 2)
498                                 return -EINVAL;
499                         if (i != RTA_MULTIPATH && i != RTA_METRICS &&
500                             i != RTA_TABLE)
501                                 rta[i-1] = (struct rtattr *)RTA_DATA(attr);
502                 }
503         }
504 
505         return 0;
506 }
507 
508 static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
509 {
510         struct net *net = sock_net(skb->sk);
511         struct dn_fib_table *tb;
512         struct rtattr **rta = arg;
513         struct rtmsg *r = NLMSG_DATA(nlh);
514 
515         if (!net_eq(net, &init_net))
516                 return -EINVAL;
517 
518         if (dn_fib_check_attr(r, rta))
519                 return -EINVAL;
520 
521         tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 0);
522         if (tb)
523                 return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
524 
525         return -ESRCH;
526 }
527 
528 static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
529 {
530         struct net *net = sock_net(skb->sk);
531         struct dn_fib_table *tb;
532         struct rtattr **rta = arg;
533         struct rtmsg *r = NLMSG_DATA(nlh);
534 
535         if (!net_eq(net, &init_net))
536                 return -EINVAL;
537 
538         if (dn_fib_check_attr(r, rta))
539                 return -EINVAL;
540 
541         tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 1);
542         if (tb)
543                 return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
544 
545         return -ENOBUFS;
546 }
547 
548 static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
549 {
550         struct dn_fib_table *tb;
551         struct {
552                 struct nlmsghdr nlh;
553                 struct rtmsg rtm;
554         } req;
555         struct dn_kern_rta rta;
556 
557         memset(&req.rtm, 0, sizeof(req.rtm));
558         memset(&rta, 0, sizeof(rta));
559 
560         if (type == RTN_UNICAST)
561                 tb = dn_fib_get_table(RT_MIN_TABLE, 1);
562         else
563                 tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
564 
565         if (tb == NULL)
566                 return;
567 
568         req.nlh.nlmsg_len = sizeof(req);
569         req.nlh.nlmsg_type = cmd;
570         req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
571         req.nlh.nlmsg_pid = 0;
572         req.nlh.nlmsg_seq = 0;
573 
574         req.rtm.rtm_dst_len = dst_len;
575         req.rtm.rtm_table = tb->n;
576         req.rtm.rtm_protocol = RTPROT_KERNEL;
577         req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
578         req.rtm.rtm_type = type;
579 
580         rta.rta_dst = &dst;
581         rta.rta_prefsrc = &ifa->ifa_local;
582         rta.rta_oif = &ifa->ifa_dev->dev->ifindex;
583 
584         if (cmd == RTM_NEWROUTE)
585                 tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL);
586         else
587                 tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL);
588 }
589 
590 static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
591 {
592 
593         fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
594 
595 #if 0
596         if (!(dev->flags&IFF_UP))
597                 return;
598         /* In the future, we will want to add default routes here */
599 
600 #endif
601 }
602 
603 static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
604 {
605         int found_it = 0;
606         struct net_device *dev;
607         struct dn_dev *dn_db;
608         struct dn_ifaddr *ifa2;
609 
610         ASSERT_RTNL();
611 
612         /* Scan device list */
613         rcu_read_lock();
614         for_each_netdev_rcu(&init_net, dev) {
615                 dn_db = rcu_dereference(dev->dn_ptr);
616                 if (dn_db == NULL)
617                         continue;
618                 for (ifa2 = rcu_dereference(dn_db->ifa_list);
619                      ifa2 != NULL;
620                      ifa2 = rcu_dereference(ifa2->ifa_next)) {
621                         if (ifa2->ifa_local == ifa->ifa_local) {
622                                 found_it = 1;
623                                 break;
624                         }
625                 }
626         }
627         rcu_read_unlock();
628 
629         if (found_it == 0) {
630                 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
631 
632                 if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
633                         if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
634                                 dn_fib_flush();
635                 }
636         }
637 }
638 
639 static void dn_fib_disable_addr(struct net_device *dev, int force)
640 {
641         if (dn_fib_sync_down(0, dev, force))
642                 dn_fib_flush();
643         dn_rt_cache_flush(0);
644         neigh_ifdown(&dn_neigh_table, dev);
645 }
646 
647 static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
648 {
649         struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
650 
651         switch (event) {
652         case NETDEV_UP:
653                 dn_fib_add_ifaddr(ifa);
654                 dn_fib_sync_up(ifa->ifa_dev->dev);
655                 dn_rt_cache_flush(-1);
656                 break;
657         case NETDEV_DOWN:
658                 dn_fib_del_ifaddr(ifa);
659                 if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
660                         dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
661                 } else {
662                         dn_rt_cache_flush(-1);
663                 }
664                 break;
665         }
666         return NOTIFY_DONE;
667 }
668 
669 static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force)
670 {
671         int ret = 0;
672         int scope = RT_SCOPE_NOWHERE;
673 
674         if (force)
675                 scope = -1;
676 
677         for_fib_info() {
678                 /*
679                  * This makes no sense for DECnet.... we will almost
680                  * certainly have more than one local address the same
681                  * over all our interfaces. It needs thinking about
682                  * some more.
683                  */
684                 if (local && fi->fib_prefsrc == local) {
685                         fi->fib_flags |= RTNH_F_DEAD;
686                         ret++;
687                 } else if (dev && fi->fib_nhs) {
688                         int dead = 0;
689 
690                         change_nexthops(fi) {
691                                 if (nh->nh_flags&RTNH_F_DEAD)
692                                         dead++;
693                                 else if (nh->nh_dev == dev &&
694                                                 nh->nh_scope != scope) {
695                                         spin_lock_bh(&dn_fib_multipath_lock);
696                                         nh->nh_flags |= RTNH_F_DEAD;
697                                         fi->fib_power -= nh->nh_power;
698                                         nh->nh_power = 0;
699                                         spin_unlock_bh(&dn_fib_multipath_lock);
700                                         dead++;
701                                 }
702                         } endfor_nexthops(fi)
703                         if (dead == fi->fib_nhs) {
704                                 fi->fib_flags |= RTNH_F_DEAD;
705                                 ret++;
706                         }
707                 }
708         } endfor_fib_info();
709         return ret;
710 }
711 
712 
713 static int dn_fib_sync_up(struct net_device *dev)
714 {
715         int ret = 0;
716 
717         if (!(dev->flags&IFF_UP))
718                 return 0;
719 
720         for_fib_info() {
721                 int alive = 0;
722 
723                 change_nexthops(fi) {
724                         if (!(nh->nh_flags&RTNH_F_DEAD)) {
725                                 alive++;
726                                 continue;
727                         }
728                         if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
729                                 continue;
730                         if (nh->nh_dev != dev || dev->dn_ptr == NULL)
731                                 continue;
732                         alive++;
733                         spin_lock_bh(&dn_fib_multipath_lock);
734                         nh->nh_power = 0;
735                         nh->nh_flags &= ~RTNH_F_DEAD;
736                         spin_unlock_bh(&dn_fib_multipath_lock);
737                 } endfor_nexthops(fi);
738 
739                 if (alive > 0) {
740                         fi->fib_flags &= ~RTNH_F_DEAD;
741                         ret++;
742                 }
743         } endfor_fib_info();
744         return ret;
745 }
746 
747 static struct notifier_block dn_fib_dnaddr_notifier = {
748         .notifier_call = dn_fib_dnaddr_event,
749 };
750 
751 void __exit dn_fib_cleanup(void)
752 {
753         dn_fib_table_cleanup();
754         dn_fib_rules_cleanup();
755 
756         unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
757 }
758 
759 
760 void __init dn_fib_init(void)
761 {
762         dn_fib_table_init();
763         dn_fib_rules_init();
764 
765         register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
766 
767         rtnl_register(PF_DECnet, RTM_NEWROUTE, dn_fib_rtm_newroute, NULL, NULL);
768         rtnl_register(PF_DECnet, RTM_DELROUTE, dn_fib_rtm_delroute, NULL, NULL);
769 }
770 
771 
772 

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