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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 static int dn_fib_count_nhs(const struct nlattr *attr)
149 {
150         struct rtnexthop *nhp = nla_data(attr);
151         int nhs = 0, nhlen = nla_len(attr);
152 
153         while(nhlen >= (int)sizeof(struct rtnexthop)) {
154                 if ((nhlen -= nhp->rtnh_len) < 0)
155                         return 0;
156                 nhs++;
157                 nhp = RTNH_NEXT(nhp);
158         }
159 
160         return nhs;
161 }
162 
163 static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct nlattr *attr,
164                           const struct rtmsg *r)
165 {
166         struct rtnexthop *nhp = nla_data(attr);
167         int nhlen = nla_len(attr);
168 
169         change_nexthops(fi) {
170                 int attrlen = nhlen - sizeof(struct rtnexthop);
171                 if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
172                         return -EINVAL;
173 
174                 nh->nh_flags  = (r->rtm_flags&~0xFF) | nhp->rtnh_flags;
175                 nh->nh_oif    = nhp->rtnh_ifindex;
176                 nh->nh_weight = nhp->rtnh_hops + 1;
177 
178                 if (attrlen) {
179                         struct nlattr *gw_attr;
180 
181                         gw_attr = nla_find((struct nlattr *) (nhp + 1), attrlen, RTA_GATEWAY);
182                         nh->nh_gw = gw_attr ? nla_get_le16(gw_attr) : 0;
183                 }
184                 nhp = RTNH_NEXT(nhp);
185         } endfor_nexthops(fi);
186 
187         return 0;
188 }
189 
190 
191 static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh)
192 {
193         int err;
194 
195         if (nh->nh_gw) {
196                 struct flowidn fld;
197                 struct dn_fib_res res;
198 
199                 if (nh->nh_flags&RTNH_F_ONLINK) {
200                         struct net_device *dev;
201 
202                         if (r->rtm_scope >= RT_SCOPE_LINK)
203                                 return -EINVAL;
204                         if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST)
205                                 return -EINVAL;
206                         if ((dev = __dev_get_by_index(&init_net, nh->nh_oif)) == NULL)
207                                 return -ENODEV;
208                         if (!(dev->flags&IFF_UP))
209                                 return -ENETDOWN;
210                         nh->nh_dev = dev;
211                         dev_hold(dev);
212                         nh->nh_scope = RT_SCOPE_LINK;
213                         return 0;
214                 }
215 
216                 memset(&fld, 0, sizeof(fld));
217                 fld.daddr = nh->nh_gw;
218                 fld.flowidn_oif = nh->nh_oif;
219                 fld.flowidn_scope = r->rtm_scope + 1;
220 
221                 if (fld.flowidn_scope < RT_SCOPE_LINK)
222                         fld.flowidn_scope = RT_SCOPE_LINK;
223 
224                 if ((err = dn_fib_lookup(&fld, &res)) != 0)
225                         return err;
226 
227                 err = -EINVAL;
228                 if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
229                         goto out;
230                 nh->nh_scope = res.scope;
231                 nh->nh_oif = DN_FIB_RES_OIF(res);
232                 nh->nh_dev = DN_FIB_RES_DEV(res);
233                 if (nh->nh_dev == NULL)
234                         goto out;
235                 dev_hold(nh->nh_dev);
236                 err = -ENETDOWN;
237                 if (!(nh->nh_dev->flags & IFF_UP))
238                         goto out;
239                 err = 0;
240 out:
241                 dn_fib_res_put(&res);
242                 return err;
243         } else {
244                 struct net_device *dev;
245 
246                 if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK))
247                         return -EINVAL;
248 
249                 dev = __dev_get_by_index(&init_net, nh->nh_oif);
250                 if (dev == NULL || dev->dn_ptr == NULL)
251                         return -ENODEV;
252                 if (!(dev->flags&IFF_UP))
253                         return -ENETDOWN;
254                 nh->nh_dev = dev;
255                 dev_hold(nh->nh_dev);
256                 nh->nh_scope = RT_SCOPE_HOST;
257         }
258 
259         return 0;
260 }
261 
262 
263 struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct nlattr *attrs[],
264                                        const struct nlmsghdr *nlh, int *errp)
265 {
266         int err;
267         struct dn_fib_info *fi = NULL;
268         struct dn_fib_info *ofi;
269         int nhs = 1;
270 
271         if (r->rtm_type > RTN_MAX)
272                 goto err_inval;
273 
274         if (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
275                 goto err_inval;
276 
277         if (attrs[RTA_MULTIPATH] &&
278             (nhs = dn_fib_count_nhs(attrs[RTA_MULTIPATH])) == 0)
279                 goto err_inval;
280 
281         fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
282         err = -ENOBUFS;
283         if (fi == NULL)
284                 goto failure;
285 
286         fi->fib_protocol = r->rtm_protocol;
287         fi->fib_nhs = nhs;
288         fi->fib_flags = r->rtm_flags;
289 
290         if (attrs[RTA_PRIORITY])
291                 fi->fib_priority = nla_get_u32(attrs[RTA_PRIORITY]);
292 
293         if (attrs[RTA_METRICS]) {
294                 struct nlattr *attr;
295                 int rem;
296 
297                 nla_for_each_nested(attr, attrs[RTA_METRICS], rem) {
298                         int type = nla_type(attr);
299 
300                         if (type) {
301                                 if (type > RTAX_MAX || nla_len(attr) < 4)
302                                         goto err_inval;
303 
304                                 fi->fib_metrics[type-1] = nla_get_u32(attr);
305                         }
306                 }
307         }
308 
309         if (attrs[RTA_PREFSRC])
310                 fi->fib_prefsrc = nla_get_le16(attrs[RTA_PREFSRC]);
311 
312         if (attrs[RTA_MULTIPATH]) {
313                 if ((err = dn_fib_get_nhs(fi, attrs[RTA_MULTIPATH], r)) != 0)
314                         goto failure;
315 
316                 if (attrs[RTA_OIF] &&
317                     fi->fib_nh->nh_oif != nla_get_u32(attrs[RTA_OIF]))
318                         goto err_inval;
319 
320                 if (attrs[RTA_GATEWAY] &&
321                     fi->fib_nh->nh_gw != nla_get_le16(attrs[RTA_GATEWAY]))
322                         goto err_inval;
323         } else {
324                 struct dn_fib_nh *nh = fi->fib_nh;
325 
326                 if (attrs[RTA_OIF])
327                         nh->nh_oif = nla_get_u32(attrs[RTA_OIF]);
328 
329                 if (attrs[RTA_GATEWAY])
330                         nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]);
331 
332                 nh->nh_flags = r->rtm_flags;
333                 nh->nh_weight = 1;
334         }
335 
336         if (r->rtm_type == RTN_NAT) {
337                 if (!attrs[RTA_GATEWAY] || nhs != 1 || attrs[RTA_OIF])
338                         goto err_inval;
339 
340                 fi->fib_nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]);
341                 goto link_it;
342         }
343 
344         if (dn_fib_props[r->rtm_type].error) {
345                 if (attrs[RTA_GATEWAY] || attrs[RTA_OIF] || attrs[RTA_MULTIPATH])
346                         goto err_inval;
347 
348                 goto link_it;
349         }
350 
351         if (r->rtm_scope > RT_SCOPE_HOST)
352                 goto err_inval;
353 
354         if (r->rtm_scope == RT_SCOPE_HOST) {
355                 struct dn_fib_nh *nh = fi->fib_nh;
356 
357                 /* Local address is added */
358                 if (nhs != 1 || nh->nh_gw)
359                         goto err_inval;
360                 nh->nh_scope = RT_SCOPE_NOWHERE;
361                 nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif);
362                 err = -ENODEV;
363                 if (nh->nh_dev == NULL)
364                         goto failure;
365         } else {
366                 change_nexthops(fi) {
367                         if ((err = dn_fib_check_nh(r, fi, nh)) != 0)
368                                 goto failure;
369                 } endfor_nexthops(fi)
370         }
371 
372         if (fi->fib_prefsrc) {
373                 if (r->rtm_type != RTN_LOCAL || !attrs[RTA_DST] ||
374                     fi->fib_prefsrc != nla_get_le16(attrs[RTA_DST]))
375                         if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
376                                 goto err_inval;
377         }
378 
379 link_it:
380         if ((ofi = dn_fib_find_info(fi)) != NULL) {
381                 fi->fib_dead = 1;
382                 dn_fib_free_info(fi);
383                 ofi->fib_treeref++;
384                 return ofi;
385         }
386 
387         fi->fib_treeref++;
388         atomic_inc(&fi->fib_clntref);
389         spin_lock(&dn_fib_info_lock);
390         fi->fib_next = dn_fib_info_list;
391         fi->fib_prev = NULL;
392         if (dn_fib_info_list)
393                 dn_fib_info_list->fib_prev = fi;
394         dn_fib_info_list = fi;
395         spin_unlock(&dn_fib_info_lock);
396         return fi;
397 
398 err_inval:
399         err = -EINVAL;
400 
401 failure:
402         *errp = err;
403         if (fi) {
404                 fi->fib_dead = 1;
405                 dn_fib_free_info(fi);
406         }
407 
408         return NULL;
409 }
410 
411 int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowidn *fld, struct dn_fib_res *res)
412 {
413         int err = dn_fib_props[type].error;
414 
415         if (err == 0) {
416                 if (fi->fib_flags & RTNH_F_DEAD)
417                         return 1;
418 
419                 res->fi = fi;
420 
421                 switch (type) {
422                 case RTN_NAT:
423                         DN_FIB_RES_RESET(*res);
424                         atomic_inc(&fi->fib_clntref);
425                         return 0;
426                 case RTN_UNICAST:
427                 case RTN_LOCAL:
428                         for_nexthops(fi) {
429                                 if (nh->nh_flags & RTNH_F_DEAD)
430                                         continue;
431                                 if (!fld->flowidn_oif ||
432                                     fld->flowidn_oif == nh->nh_oif)
433                                         break;
434                         }
435                         if (nhsel < fi->fib_nhs) {
436                                 res->nh_sel = nhsel;
437                                 atomic_inc(&fi->fib_clntref);
438                                 return 0;
439                         }
440                         endfor_nexthops(fi);
441                         res->fi = NULL;
442                         return 1;
443                 default:
444                         net_err_ratelimited("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n",
445                                             type);
446                         res->fi = NULL;
447                         return -EINVAL;
448                 }
449         }
450         return err;
451 }
452 
453 void dn_fib_select_multipath(const struct flowidn *fld, struct dn_fib_res *res)
454 {
455         struct dn_fib_info *fi = res->fi;
456         int w;
457 
458         spin_lock_bh(&dn_fib_multipath_lock);
459         if (fi->fib_power <= 0) {
460                 int power = 0;
461                 change_nexthops(fi) {
462                         if (!(nh->nh_flags&RTNH_F_DEAD)) {
463                                 power += nh->nh_weight;
464                                 nh->nh_power = nh->nh_weight;
465                         }
466                 } endfor_nexthops(fi);
467                 fi->fib_power = power;
468                 if (power < 0) {
469                         spin_unlock_bh(&dn_fib_multipath_lock);
470                         res->nh_sel = 0;
471                         return;
472                 }
473         }
474 
475         w = jiffies % fi->fib_power;
476 
477         change_nexthops(fi) {
478                 if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
479                         if ((w -= nh->nh_power) <= 0) {
480                                 nh->nh_power--;
481                                 fi->fib_power--;
482                                 res->nh_sel = nhsel;
483                                 spin_unlock_bh(&dn_fib_multipath_lock);
484                                 return;
485                         }
486                 }
487         } endfor_nexthops(fi);
488         res->nh_sel = 0;
489         spin_unlock_bh(&dn_fib_multipath_lock);
490 }
491 
492 static inline u32 rtm_get_table(struct nlattr *attrs[], u8 table)
493 {
494         if (attrs[RTA_TABLE])
495                 table = nla_get_u32(attrs[RTA_TABLE]);
496 
497         return table;
498 }
499 
500 static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
501 {
502         struct net *net = sock_net(skb->sk);
503         struct dn_fib_table *tb;
504         struct rtmsg *r = nlmsg_data(nlh);
505         struct nlattr *attrs[RTA_MAX+1];
506         int err;
507 
508         if (!netlink_capable(skb, CAP_NET_ADMIN))
509                 return -EPERM;
510 
511         if (!net_eq(net, &init_net))
512                 return -EINVAL;
513 
514         err = nlmsg_parse(nlh, sizeof(*r), attrs, RTA_MAX, rtm_dn_policy);
515         if (err < 0)
516                 return err;
517 
518         tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 0);
519         if (!tb)
520                 return -ESRCH;
521 
522         return tb->delete(tb, r, attrs, nlh, &NETLINK_CB(skb));
523 }
524 
525 static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
526 {
527         struct net *net = sock_net(skb->sk);
528         struct dn_fib_table *tb;
529         struct rtmsg *r = nlmsg_data(nlh);
530         struct nlattr *attrs[RTA_MAX+1];
531         int err;
532 
533         if (!netlink_capable(skb, CAP_NET_ADMIN))
534                 return -EPERM;
535 
536         if (!net_eq(net, &init_net))
537                 return -EINVAL;
538 
539         err = nlmsg_parse(nlh, sizeof(*r), attrs, RTA_MAX, rtm_dn_policy);
540         if (err < 0)
541                 return err;
542 
543         tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 1);
544         if (!tb)
545                 return -ENOBUFS;
546 
547         return tb->insert(tb, r, attrs, nlh, &NETLINK_CB(skb));
548 }
549 
550 static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
551 {
552         struct dn_fib_table *tb;
553         struct {
554                 struct nlmsghdr nlh;
555                 struct rtmsg rtm;
556         } req;
557         struct {
558                 struct nlattr hdr;
559                 __le16 dst;
560         } dst_attr = {
561                 .dst = dst,
562         };
563         struct {
564                 struct nlattr hdr;
565                 __le16 prefsrc;
566         } prefsrc_attr = {
567                 .prefsrc = ifa->ifa_local,
568         };
569         struct {
570                 struct nlattr hdr;
571                 u32 oif;
572         } oif_attr = {
573                 .oif = ifa->ifa_dev->dev->ifindex,
574         };
575         struct nlattr *attrs[RTA_MAX+1] = {
576                 [RTA_DST] = (struct nlattr *) &dst_attr,
577                 [RTA_PREFSRC] = (struct nlattr * ) &prefsrc_attr,
578                 [RTA_OIF] = (struct nlattr *) &oif_attr,
579         };
580 
581         memset(&req.rtm, 0, sizeof(req.rtm));
582 
583         if (type == RTN_UNICAST)
584                 tb = dn_fib_get_table(RT_MIN_TABLE, 1);
585         else
586                 tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
587 
588         if (tb == NULL)
589                 return;
590 
591         req.nlh.nlmsg_len = sizeof(req);
592         req.nlh.nlmsg_type = cmd;
593         req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
594         req.nlh.nlmsg_pid = 0;
595         req.nlh.nlmsg_seq = 0;
596 
597         req.rtm.rtm_dst_len = dst_len;
598         req.rtm.rtm_table = tb->n;
599         req.rtm.rtm_protocol = RTPROT_KERNEL;
600         req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
601         req.rtm.rtm_type = type;
602 
603         if (cmd == RTM_NEWROUTE)
604                 tb->insert(tb, &req.rtm, attrs, &req.nlh, NULL);
605         else
606                 tb->delete(tb, &req.rtm, attrs, &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         rcu_read_lock();
633         for_each_netdev_rcu(&init_net, dev) {
634                 dn_db = rcu_dereference(dev->dn_ptr);
635                 if (dn_db == NULL)
636                         continue;
637                 for (ifa2 = rcu_dereference(dn_db->ifa_list);
638                      ifa2 != NULL;
639                      ifa2 = rcu_dereference(ifa2->ifa_next)) {
640                         if (ifa2->ifa_local == ifa->ifa_local) {
641                                 found_it = 1;
642                                 break;
643                         }
644                 }
645         }
646         rcu_read_unlock();
647 
648         if (found_it == 0) {
649                 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
650 
651                 if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
652                         if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
653                                 dn_fib_flush();
654                 }
655         }
656 }
657 
658 static void dn_fib_disable_addr(struct net_device *dev, int force)
659 {
660         if (dn_fib_sync_down(0, dev, force))
661                 dn_fib_flush();
662         dn_rt_cache_flush(0);
663         neigh_ifdown(&dn_neigh_table, dev);
664 }
665 
666 static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
667 {
668         struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
669 
670         switch (event) {
671         case NETDEV_UP:
672                 dn_fib_add_ifaddr(ifa);
673                 dn_fib_sync_up(ifa->ifa_dev->dev);
674                 dn_rt_cache_flush(-1);
675                 break;
676         case NETDEV_DOWN:
677                 dn_fib_del_ifaddr(ifa);
678                 if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
679                         dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
680                 } else {
681                         dn_rt_cache_flush(-1);
682                 }
683                 break;
684         }
685         return NOTIFY_DONE;
686 }
687 
688 static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force)
689 {
690         int ret = 0;
691         int scope = RT_SCOPE_NOWHERE;
692 
693         if (force)
694                 scope = -1;
695 
696         for_fib_info() {
697                 /*
698                  * This makes no sense for DECnet.... we will almost
699                  * certainly have more than one local address the same
700                  * over all our interfaces. It needs thinking about
701                  * some more.
702                  */
703                 if (local && fi->fib_prefsrc == local) {
704                         fi->fib_flags |= RTNH_F_DEAD;
705                         ret++;
706                 } else if (dev && fi->fib_nhs) {
707                         int dead = 0;
708 
709                         change_nexthops(fi) {
710                                 if (nh->nh_flags&RTNH_F_DEAD)
711                                         dead++;
712                                 else if (nh->nh_dev == dev &&
713                                                 nh->nh_scope != scope) {
714                                         spin_lock_bh(&dn_fib_multipath_lock);
715                                         nh->nh_flags |= RTNH_F_DEAD;
716                                         fi->fib_power -= nh->nh_power;
717                                         nh->nh_power = 0;
718                                         spin_unlock_bh(&dn_fib_multipath_lock);
719                                         dead++;
720                                 }
721                         } endfor_nexthops(fi)
722                         if (dead == fi->fib_nhs) {
723                                 fi->fib_flags |= RTNH_F_DEAD;
724                                 ret++;
725                         }
726                 }
727         } endfor_fib_info();
728         return ret;
729 }
730 
731 
732 static int dn_fib_sync_up(struct net_device *dev)
733 {
734         int ret = 0;
735 
736         if (!(dev->flags&IFF_UP))
737                 return 0;
738 
739         for_fib_info() {
740                 int alive = 0;
741 
742                 change_nexthops(fi) {
743                         if (!(nh->nh_flags&RTNH_F_DEAD)) {
744                                 alive++;
745                                 continue;
746                         }
747                         if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
748                                 continue;
749                         if (nh->nh_dev != dev || dev->dn_ptr == NULL)
750                                 continue;
751                         alive++;
752                         spin_lock_bh(&dn_fib_multipath_lock);
753                         nh->nh_power = 0;
754                         nh->nh_flags &= ~RTNH_F_DEAD;
755                         spin_unlock_bh(&dn_fib_multipath_lock);
756                 } endfor_nexthops(fi);
757 
758                 if (alive > 0) {
759                         fi->fib_flags &= ~RTNH_F_DEAD;
760                         ret++;
761                 }
762         } endfor_fib_info();
763         return ret;
764 }
765 
766 static struct notifier_block dn_fib_dnaddr_notifier = {
767         .notifier_call = dn_fib_dnaddr_event,
768 };
769 
770 void __exit dn_fib_cleanup(void)
771 {
772         dn_fib_table_cleanup();
773         dn_fib_rules_cleanup();
774 
775         unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
776 }
777 
778 
779 void __init dn_fib_init(void)
780 {
781         dn_fib_table_init();
782         dn_fib_rules_init();
783 
784         register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
785 
786         rtnl_register(PF_DECnet, RTM_NEWROUTE, dn_fib_rtm_newroute, NULL, NULL);
787         rtnl_register(PF_DECnet, RTM_DELROUTE, dn_fib_rtm_delroute, NULL, NULL);
788 }
789 
790 
791 

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