[PATCH] fadvise() make POSIX_FADV_NOREUSE a no-op
[linux-2.6] / 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 = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
287         err = -ENOBUFS;
288         if (fi == NULL)
289                 goto failure;
290
291         fi->fib_protocol = r->rtm_protocol;
292         fi->fib_nhs = nhs;
293         fi->fib_flags = r->rtm_flags;
294         if (rta->rta_priority)
295                 fi->fib_priority = *rta->rta_priority;
296         if (rta->rta_mx) {
297                 int attrlen = RTA_PAYLOAD(rta->rta_mx);
298                 struct rtattr *attr = RTA_DATA(rta->rta_mx);
299
300                 while(RTA_OK(attr, attrlen)) {
301                         unsigned flavour = attr->rta_type;
302                         if (flavour) {
303                                 if (flavour > RTAX_MAX)
304                                         goto err_inval;
305                                 fi->fib_metrics[flavour-1] = *(unsigned*)RTA_DATA(attr);
306                         }
307                         attr = RTA_NEXT(attr, attrlen);
308                 }
309         }
310         if (rta->rta_prefsrc)
311                 memcpy(&fi->fib_prefsrc, rta->rta_prefsrc, 2);
312
313         if (rta->rta_mp) {
314                 if ((err = dn_fib_get_nhs(fi, rta->rta_mp, r)) != 0)
315                         goto failure;
316                 if (rta->rta_oif && fi->fib_nh->nh_oif != *rta->rta_oif)
317                         goto err_inval;
318                 if (rta->rta_gw && memcmp(&fi->fib_nh->nh_gw, rta->rta_gw, 2))
319                         goto err_inval;
320         } else {
321                 struct dn_fib_nh *nh = fi->fib_nh;
322                 if (rta->rta_oif)
323                         nh->nh_oif = *rta->rta_oif;
324                 if (rta->rta_gw)
325                         memcpy(&nh->nh_gw, rta->rta_gw, 2);
326                 nh->nh_flags = r->rtm_flags;
327                 nh->nh_weight = 1;
328         }
329
330         if (r->rtm_type == RTN_NAT) {
331                 if (rta->rta_gw == NULL || nhs != 1 || rta->rta_oif)
332                         goto err_inval;
333                 memcpy(&fi->fib_nh->nh_gw, rta->rta_gw, 2);
334                 goto link_it;
335         }
336
337         if (dn_fib_props[r->rtm_type].error) {
338                 if (rta->rta_gw || rta->rta_oif || rta->rta_mp)
339                         goto err_inval;
340                 goto link_it;
341         }
342
343         if (r->rtm_scope > RT_SCOPE_HOST)
344                 goto err_inval;
345
346         if (r->rtm_scope == RT_SCOPE_HOST) {
347                 struct dn_fib_nh *nh = fi->fib_nh;
348
349                 /* Local address is added */
350                 if (nhs != 1 || nh->nh_gw)
351                         goto err_inval;
352                 nh->nh_scope = RT_SCOPE_NOWHERE;
353                 nh->nh_dev = dev_get_by_index(fi->fib_nh->nh_oif);
354                 err = -ENODEV;
355                 if (nh->nh_dev == NULL)
356                         goto failure;
357         } else {
358                 change_nexthops(fi) {
359                         if ((err = dn_fib_check_nh(r, fi, nh)) != 0)
360                                 goto failure;
361                 } endfor_nexthops(fi)
362         }
363
364         if (fi->fib_prefsrc) {
365                 if (r->rtm_type != RTN_LOCAL || rta->rta_dst == NULL ||
366                     memcmp(&fi->fib_prefsrc, rta->rta_dst, 2))
367                         if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
368                                 goto err_inval;
369         }
370
371 link_it:
372         if ((ofi = dn_fib_find_info(fi)) != NULL) {
373                 fi->fib_dead = 1;
374                 dn_fib_free_info(fi);
375                 ofi->fib_treeref++;
376                 return ofi;
377         }
378
379         fi->fib_treeref++;
380         atomic_inc(&fi->fib_clntref);
381         write_lock(&dn_fib_info_lock);
382         fi->fib_next = dn_fib_info_list;
383         fi->fib_prev = NULL;
384         if (dn_fib_info_list)
385                 dn_fib_info_list->fib_prev = fi;
386         dn_fib_info_list = fi;
387         write_unlock(&dn_fib_info_lock);
388         return fi;
389
390 err_inval:
391         err = -EINVAL;
392
393 failure:
394         *errp = err;
395         if (fi) {
396                 fi->fib_dead = 1;
397                 dn_fib_free_info(fi);
398         }
399
400         return NULL;
401 }
402
403 int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowi *fl, struct dn_fib_res *res)
404 {
405         int err = dn_fib_props[type].error;
406
407         if (err == 0) {
408                 if (fi->fib_flags & RTNH_F_DEAD)
409                         return 1;
410
411                 res->fi = fi;
412
413                 switch(type) {
414                         case RTN_NAT:
415                                 DN_FIB_RES_RESET(*res);
416                                 atomic_inc(&fi->fib_clntref);
417                                 return 0;
418                         case RTN_UNICAST:
419                         case RTN_LOCAL:
420                                 for_nexthops(fi) {
421                                         if (nh->nh_flags & RTNH_F_DEAD)
422                                                 continue;
423                                         if (!fl->oif || fl->oif == nh->nh_oif)
424                                                 break;
425                                 }
426                                 if (nhsel < fi->fib_nhs) {
427                                         res->nh_sel = nhsel;
428                                         atomic_inc(&fi->fib_clntref);
429                                         return 0;
430                                 }
431                                 endfor_nexthops(fi);
432                                 res->fi = NULL;
433                                 return 1;
434                         default:
435                                 if (net_ratelimit())
436                                          printk("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n", type);
437                                 res->fi = NULL;
438                                 return -EINVAL;
439                 }
440         }
441         return err;
442 }
443
444 void dn_fib_select_multipath(const struct flowi *fl, struct dn_fib_res *res)
445 {
446         struct dn_fib_info *fi = res->fi;
447         int w;
448
449         spin_lock_bh(&dn_fib_multipath_lock);
450         if (fi->fib_power <= 0) {
451                 int power = 0;
452                 change_nexthops(fi) {
453                         if (!(nh->nh_flags&RTNH_F_DEAD)) {
454                                 power += nh->nh_weight;
455                                 nh->nh_power = nh->nh_weight;
456                         }
457                 } endfor_nexthops(fi);
458                 fi->fib_power = power;
459                 if (power < 0) {
460                         spin_unlock_bh(&dn_fib_multipath_lock);
461                         res->nh_sel = 0;
462                         return;
463                 }
464         }
465
466         w = jiffies % fi->fib_power;
467
468         change_nexthops(fi) {
469                 if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
470                         if ((w -= nh->nh_power) <= 0) {
471                                 nh->nh_power--;
472                                 fi->fib_power--;
473                                 res->nh_sel = nhsel;
474                                 spin_unlock_bh(&dn_fib_multipath_lock);
475                                 return;
476                         }
477                 }
478         } endfor_nexthops(fi);
479         res->nh_sel = 0;
480         spin_unlock_bh(&dn_fib_multipath_lock);
481 }
482
483
484 static int dn_fib_check_attr(struct rtmsg *r, struct rtattr **rta)
485 {
486         int i;
487
488         for(i = 1; i <= RTA_MAX; i++) {
489                 struct rtattr *attr = rta[i-1];
490                 if (attr) {
491                         if (RTA_PAYLOAD(attr) < 4 && RTA_PAYLOAD(attr) != 2)
492                                 return -EINVAL;
493                         if (i != RTA_MULTIPATH && i != RTA_METRICS)
494                                 rta[i-1] = (struct rtattr *)RTA_DATA(attr);
495                 }
496         }
497
498         return 0;
499 }
500
501 int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
502 {
503         struct dn_fib_table *tb;
504         struct rtattr **rta = arg;
505         struct rtmsg *r = NLMSG_DATA(nlh);
506
507         if (dn_fib_check_attr(r, rta))
508                 return -EINVAL;
509
510         tb = dn_fib_get_table(r->rtm_table, 0);
511         if (tb)
512                 return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
513
514         return -ESRCH;
515 }
516
517 int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
518 {
519         struct dn_fib_table *tb;
520         struct rtattr **rta = arg;
521         struct rtmsg *r = NLMSG_DATA(nlh);
522
523         if (dn_fib_check_attr(r, rta))
524                 return -EINVAL;
525
526         tb = dn_fib_get_table(r->rtm_table, 1);
527         if (tb) 
528                 return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
529
530         return -ENOBUFS;
531 }
532
533
534 int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb)
535 {
536         int t;
537         int s_t;
538         struct dn_fib_table *tb;
539
540         if (NLMSG_PAYLOAD(cb->nlh, 0) >= sizeof(struct rtmsg) &&
541                 ((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED)
542                         return dn_cache_dump(skb, cb);
543
544         s_t = cb->args[0];
545         if (s_t == 0)
546                 s_t = cb->args[0] = RT_MIN_TABLE;
547
548         for(t = s_t; t <= RT_TABLE_MAX; t++) {
549                 if (t < s_t)
550                         continue;
551                 if (t > s_t)
552                         memset(&cb->args[1], 0,
553                                sizeof(cb->args) - sizeof(cb->args[0]));
554                 tb = dn_fib_get_table(t, 0);
555                 if (tb == NULL)
556                         continue;
557                 if (tb->dump(tb, skb, cb) < 0)
558                         break;
559         }
560
561         cb->args[0] = t;
562
563         return skb->len;
564 }
565
566 static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
567 {
568         struct dn_fib_table *tb;
569         struct {
570                 struct nlmsghdr nlh;
571                 struct rtmsg rtm;
572         } req;
573         struct dn_kern_rta rta;
574
575         memset(&req.rtm, 0, sizeof(req.rtm));
576         memset(&rta, 0, sizeof(rta));
577
578         if (type == RTN_UNICAST)
579                 tb = dn_fib_get_table(RT_MIN_TABLE, 1);
580         else
581                 tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
582
583         if (tb == NULL)
584                 return;
585
586         req.nlh.nlmsg_len = sizeof(req);
587         req.nlh.nlmsg_type = cmd;
588         req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
589         req.nlh.nlmsg_pid = 0;
590         req.nlh.nlmsg_seq = 0;
591
592         req.rtm.rtm_dst_len = dst_len;
593         req.rtm.rtm_table = tb->n;
594         req.rtm.rtm_protocol = RTPROT_KERNEL;
595         req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
596         req.rtm.rtm_type = type;
597
598         rta.rta_dst = &dst;
599         rta.rta_prefsrc = &ifa->ifa_local;
600         rta.rta_oif = &ifa->ifa_dev->dev->ifindex;
601
602         if (cmd == RTM_NEWROUTE)
603                 tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL);
604         else
605                 tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL);
606 }
607
608 static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
609 {
610
611         fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
612
613 #if 0
614         if (!(dev->flags&IFF_UP))
615                 return;
616         /* In the future, we will want to add default routes here */
617
618 #endif
619 }
620
621 static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
622 {
623         int found_it = 0;
624         struct net_device *dev;
625         struct dn_dev *dn_db;
626         struct dn_ifaddr *ifa2;
627
628         ASSERT_RTNL();
629
630         /* Scan device list */
631         read_lock(&dev_base_lock);
632         for(dev = dev_base; dev; dev = dev->next) {
633                 dn_db = dev->dn_ptr;
634                 if (dn_db == NULL)
635                         continue;
636                 for(ifa2 = dn_db->ifa_list; ifa2; ifa2 = ifa2->ifa_next) {
637                         if (ifa2->ifa_local == ifa->ifa_local) {
638                                 found_it = 1;
639                                 break;
640                         }
641                 }
642         }
643         read_unlock(&dev_base_lock);
644
645         if (found_it == 0) {
646                 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
647
648                 if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
649                         if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
650                                 dn_fib_flush();
651                 }
652         }
653 }
654
655 static void dn_fib_disable_addr(struct net_device *dev, int force)
656 {
657         if (dn_fib_sync_down(0, dev, force))
658                 dn_fib_flush();
659         dn_rt_cache_flush(0);
660         neigh_ifdown(&dn_neigh_table, dev);
661 }
662
663 static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
664 {
665         struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
666
667         switch(event) {
668                 case NETDEV_UP:
669                         dn_fib_add_ifaddr(ifa);
670                         dn_fib_sync_up(ifa->ifa_dev->dev);
671                         dn_rt_cache_flush(-1);
672                         break;
673                 case NETDEV_DOWN:
674                         dn_fib_del_ifaddr(ifa);
675                         if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
676                                 dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
677                         } else {
678                                 dn_rt_cache_flush(-1);
679                         }
680                         break;
681         }
682         return NOTIFY_DONE;
683 }
684
685 int dn_fib_sync_down(__le16 local, struct net_device *dev, int force)
686 {
687         int ret = 0;
688         int scope = RT_SCOPE_NOWHERE;
689
690         if (force)
691                 scope = -1;
692
693         for_fib_info() {
694                 /* 
695                  * This makes no sense for DECnet.... we will almost
696                  * certainly have more than one local address the same
697                  * over all our interfaces. It needs thinking about
698                  * some more.
699                  */
700                 if (local && fi->fib_prefsrc == local) {
701                         fi->fib_flags |= RTNH_F_DEAD;
702                         ret++;
703                 } else if (dev && fi->fib_nhs) {
704                         int dead = 0;
705
706                         change_nexthops(fi) {
707                                 if (nh->nh_flags&RTNH_F_DEAD)
708                                         dead++;
709                                 else if (nh->nh_dev == dev &&
710                                                 nh->nh_scope != scope) {
711                                         spin_lock_bh(&dn_fib_multipath_lock);
712                                         nh->nh_flags |= RTNH_F_DEAD;
713                                         fi->fib_power -= nh->nh_power;
714                                         nh->nh_power = 0;
715                                         spin_unlock_bh(&dn_fib_multipath_lock);
716                                         dead++;
717                                 }
718                         } endfor_nexthops(fi)
719                         if (dead == fi->fib_nhs) {
720                                 fi->fib_flags |= RTNH_F_DEAD;
721                                 ret++;
722                         }
723                 }
724         } endfor_fib_info();
725         return ret;
726 }
727
728
729 int dn_fib_sync_up(struct net_device *dev)
730 {
731         int ret = 0;
732
733         if (!(dev->flags&IFF_UP))
734                 return 0;
735
736         for_fib_info() {
737                 int alive = 0;
738
739                 change_nexthops(fi) {
740                         if (!(nh->nh_flags&RTNH_F_DEAD)) {
741                                 alive++;
742                                 continue;
743                         }
744                         if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
745                                 continue;
746                         if (nh->nh_dev != dev || dev->dn_ptr == NULL)
747                                 continue;
748                         alive++;
749                         spin_lock_bh(&dn_fib_multipath_lock);
750                         nh->nh_power = 0;
751                         nh->nh_flags &= ~RTNH_F_DEAD;
752                         spin_unlock_bh(&dn_fib_multipath_lock);
753                 } endfor_nexthops(fi);
754
755                 if (alive > 0) {
756                         fi->fib_flags &= ~RTNH_F_DEAD;
757                         ret++;
758                 }
759         } endfor_fib_info();
760         return ret;
761 }
762
763 void dn_fib_flush(void)
764 {
765         int flushed = 0;
766         struct dn_fib_table *tb;
767         int id;
768
769         for(id = RT_TABLE_MAX; id > 0; id--) {
770                 if ((tb = dn_fib_get_table(id, 0)) == NULL)
771                         continue;
772                 flushed += tb->flush(tb);
773         }
774
775         if (flushed)
776                 dn_rt_cache_flush(-1);
777 }
778
779 static struct notifier_block dn_fib_dnaddr_notifier = {
780         .notifier_call = dn_fib_dnaddr_event,
781 };
782
783 void __exit dn_fib_cleanup(void)
784 {
785         dn_fib_table_cleanup();
786         dn_fib_rules_cleanup();
787
788         unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
789 }
790
791
792 void __init dn_fib_init(void)
793 {
794
795         dn_fib_table_init();
796         dn_fib_rules_init();
797
798         register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
799 }
800
801