Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6.git] / 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 static DEFINE_SPINLOCK(dn_fib_multipath_lock);
59 static struct dn_fib_info *dn_fib_info_list;
60 static DEFINE_SPINLOCK(dn_fib_info_lock);
61
62 static struct
63 {
64         int error;
65         u8 scope;
66 } dn_fib_props[RTN_MAX+1] = {
67         [RTN_UNSPEC] =      { .error = 0,       .scope = RT_SCOPE_NOWHERE },
68         [RTN_UNICAST] =     { .error = 0,       .scope = RT_SCOPE_UNIVERSE },
69         [RTN_LOCAL] =       { .error = 0,       .scope = RT_SCOPE_HOST },
70         [RTN_BROADCAST] =   { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
71         [RTN_ANYCAST] =     { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
72         [RTN_MULTICAST] =   { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
73         [RTN_BLACKHOLE] =   { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE },
74         [RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE },
75         [RTN_PROHIBIT] =    { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE },
76         [RTN_THROW] =       { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE },
77         [RTN_NAT] =         { .error = 0,       .scope = RT_SCOPE_NOWHERE },
78         [RTN_XRESOLVE] =    { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
79 };
80
81 static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force);
82 static int dn_fib_sync_up(struct net_device *dev);
83
84 void dn_fib_free_info(struct dn_fib_info *fi)
85 {
86         if (fi->fib_dead == 0) {
87                 printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n");
88                 return;
89         }
90
91         change_nexthops(fi) {
92                 if (nh->nh_dev)
93                         dev_put(nh->nh_dev);
94                 nh->nh_dev = NULL;
95         } endfor_nexthops(fi);
96         kfree(fi);
97 }
98
99 void dn_fib_release_info(struct dn_fib_info *fi)
100 {
101         spin_lock(&dn_fib_info_lock);
102         if (fi && --fi->fib_treeref == 0) {
103                 if (fi->fib_next)
104                         fi->fib_next->fib_prev = fi->fib_prev;
105                 if (fi->fib_prev)
106                         fi->fib_prev->fib_next = fi->fib_next;
107                 if (fi == dn_fib_info_list)
108                         dn_fib_info_list = fi->fib_next;
109                 fi->fib_dead = 1;
110                 dn_fib_info_put(fi);
111         }
112         spin_unlock(&dn_fib_info_lock);
113 }
114
115 static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi)
116 {
117         const struct dn_fib_nh *onh = ofi->fib_nh;
118
119         for_nexthops(fi) {
120                 if (nh->nh_oif != onh->nh_oif ||
121                         nh->nh_gw != onh->nh_gw ||
122                         nh->nh_scope != onh->nh_scope ||
123                         nh->nh_weight != onh->nh_weight ||
124                         ((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD))
125                                 return -1;
126                 onh++;
127         } endfor_nexthops(fi);
128         return 0;
129 }
130
131 static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi)
132 {
133         for_fib_info() {
134                 if (fi->fib_nhs != nfi->fib_nhs)
135                         continue;
136                 if (nfi->fib_protocol == fi->fib_protocol &&
137                         nfi->fib_prefsrc == fi->fib_prefsrc &&
138                         nfi->fib_priority == fi->fib_priority &&
139                         memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 &&
140                         ((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 &&
141                         (nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0))
142                                 return fi;
143         } endfor_fib_info();
144         return NULL;
145 }
146
147 __le16 dn_fib_get_attr16(struct rtattr *attr, int attrlen, int type)
148 {
149         while(RTA_OK(attr,attrlen)) {
150                 if (attr->rta_type == type)
151                         return *(__le16*)RTA_DATA(attr);
152                 attr = RTA_NEXT(attr, attrlen);
153         }
154
155         return 0;
156 }
157
158 static int dn_fib_count_nhs(struct rtattr *rta)
159 {
160         int nhs = 0;
161         struct rtnexthop *nhp = RTA_DATA(rta);
162         int nhlen = RTA_PAYLOAD(rta);
163
164         while(nhlen >= (int)sizeof(struct rtnexthop)) {
165                 if ((nhlen -= nhp->rtnh_len) < 0)
166                         return 0;
167                 nhs++;
168                 nhp = RTNH_NEXT(nhp);
169         }
170
171         return nhs;
172 }
173
174 static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct rtattr *rta, const struct rtmsg *r)
175 {
176         struct rtnexthop *nhp = RTA_DATA(rta);
177         int nhlen = RTA_PAYLOAD(rta);
178
179         change_nexthops(fi) {
180                 int attrlen = nhlen - sizeof(struct rtnexthop);
181                 if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
182                         return -EINVAL;
183
184                 nh->nh_flags  = (r->rtm_flags&~0xFF) | nhp->rtnh_flags;
185                 nh->nh_oif    = nhp->rtnh_ifindex;
186                 nh->nh_weight = nhp->rtnh_hops + 1;
187
188                 if (attrlen) {
189                         nh->nh_gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
190                 }
191                 nhp = RTNH_NEXT(nhp);
192         } endfor_nexthops(fi);
193
194         return 0;
195 }
196
197
198 static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh)
199 {
200         int err;
201
202         if (nh->nh_gw) {
203                 struct flowi fl;
204                 struct dn_fib_res res;
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(&init_net, 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(&init_net, 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 (r->rtm_type > RTN_MAX)
278                 goto err_inval;
279
280         if (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
281                 goto err_inval;
282
283         if (rta->rta_mp) {
284                 nhs = dn_fib_count_nhs(rta->rta_mp);
285                 if (nhs == 0)
286                         goto err_inval;
287         }
288
289         fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
290         err = -ENOBUFS;
291         if (fi == NULL)
292                 goto failure;
293
294         fi->fib_protocol = r->rtm_protocol;
295         fi->fib_nhs = nhs;
296         fi->fib_flags = r->rtm_flags;
297         if (rta->rta_priority)
298                 fi->fib_priority = *rta->rta_priority;
299         if (rta->rta_mx) {
300                 int attrlen = RTA_PAYLOAD(rta->rta_mx);
301                 struct rtattr *attr = RTA_DATA(rta->rta_mx);
302
303                 while(RTA_OK(attr, attrlen)) {
304                         unsigned flavour = attr->rta_type;
305                         if (flavour) {
306                                 if (flavour > RTAX_MAX)
307                                         goto err_inval;
308                                 fi->fib_metrics[flavour-1] = *(unsigned*)RTA_DATA(attr);
309                         }
310                         attr = RTA_NEXT(attr, attrlen);
311                 }
312         }
313         if (rta->rta_prefsrc)
314                 memcpy(&fi->fib_prefsrc, rta->rta_prefsrc, 2);
315
316         if (rta->rta_mp) {
317                 if ((err = dn_fib_get_nhs(fi, rta->rta_mp, r)) != 0)
318                         goto failure;
319                 if (rta->rta_oif && fi->fib_nh->nh_oif != *rta->rta_oif)
320                         goto err_inval;
321                 if (rta->rta_gw && memcmp(&fi->fib_nh->nh_gw, rta->rta_gw, 2))
322                         goto err_inval;
323         } else {
324                 struct dn_fib_nh *nh = fi->fib_nh;
325                 if (rta->rta_oif)
326                         nh->nh_oif = *rta->rta_oif;
327                 if (rta->rta_gw)
328                         memcpy(&nh->nh_gw, rta->rta_gw, 2);
329                 nh->nh_flags = r->rtm_flags;
330                 nh->nh_weight = 1;
331         }
332
333         if (r->rtm_type == RTN_NAT) {
334                 if (rta->rta_gw == NULL || nhs != 1 || rta->rta_oif)
335                         goto err_inval;
336                 memcpy(&fi->fib_nh->nh_gw, rta->rta_gw, 2);
337                 goto link_it;
338         }
339
340         if (dn_fib_props[r->rtm_type].error) {
341                 if (rta->rta_gw || rta->rta_oif || rta->rta_mp)
342                         goto err_inval;
343                 goto link_it;
344         }
345
346         if (r->rtm_scope > RT_SCOPE_HOST)
347                 goto err_inval;
348
349         if (r->rtm_scope == RT_SCOPE_HOST) {
350                 struct dn_fib_nh *nh = fi->fib_nh;
351
352                 /* Local address is added */
353                 if (nhs != 1 || nh->nh_gw)
354                         goto err_inval;
355                 nh->nh_scope = RT_SCOPE_NOWHERE;
356                 nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif);
357                 err = -ENODEV;
358                 if (nh->nh_dev == NULL)
359                         goto failure;
360         } else {
361                 change_nexthops(fi) {
362                         if ((err = dn_fib_check_nh(r, fi, nh)) != 0)
363                                 goto failure;
364                 } endfor_nexthops(fi)
365         }
366
367         if (fi->fib_prefsrc) {
368                 if (r->rtm_type != RTN_LOCAL || rta->rta_dst == NULL ||
369                     memcmp(&fi->fib_prefsrc, rta->rta_dst, 2))
370                         if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
371                                 goto err_inval;
372         }
373
374 link_it:
375         if ((ofi = dn_fib_find_info(fi)) != NULL) {
376                 fi->fib_dead = 1;
377                 dn_fib_free_info(fi);
378                 ofi->fib_treeref++;
379                 return ofi;
380         }
381
382         fi->fib_treeref++;
383         atomic_inc(&fi->fib_clntref);
384         spin_lock(&dn_fib_info_lock);
385         fi->fib_next = dn_fib_info_list;
386         fi->fib_prev = NULL;
387         if (dn_fib_info_list)
388                 dn_fib_info_list->fib_prev = fi;
389         dn_fib_info_list = fi;
390         spin_unlock(&dn_fib_info_lock);
391         return fi;
392
393 err_inval:
394         err = -EINVAL;
395
396 failure:
397         *errp = err;
398         if (fi) {
399                 fi->fib_dead = 1;
400                 dn_fib_free_info(fi);
401         }
402
403         return NULL;
404 }
405
406 int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowi *fl, struct dn_fib_res *res)
407 {
408         int err = dn_fib_props[type].error;
409
410         if (err == 0) {
411                 if (fi->fib_flags & RTNH_F_DEAD)
412                         return 1;
413
414                 res->fi = fi;
415
416                 switch(type) {
417                         case RTN_NAT:
418                                 DN_FIB_RES_RESET(*res);
419                                 atomic_inc(&fi->fib_clntref);
420                                 return 0;
421                         case RTN_UNICAST:
422                         case RTN_LOCAL:
423                                 for_nexthops(fi) {
424                                         if (nh->nh_flags & RTNH_F_DEAD)
425                                                 continue;
426                                         if (!fl->oif || fl->oif == nh->nh_oif)
427                                                 break;
428                                 }
429                                 if (nhsel < fi->fib_nhs) {
430                                         res->nh_sel = nhsel;
431                                         atomic_inc(&fi->fib_clntref);
432                                         return 0;
433                                 }
434                                 endfor_nexthops(fi);
435                                 res->fi = NULL;
436                                 return 1;
437                         default:
438                                 if (net_ratelimit())
439                                          printk("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n", type);
440                                 res->fi = NULL;
441                                 return -EINVAL;
442                 }
443         }
444         return err;
445 }
446
447 void dn_fib_select_multipath(const struct flowi *fl, struct dn_fib_res *res)
448 {
449         struct dn_fib_info *fi = res->fi;
450         int w;
451
452         spin_lock_bh(&dn_fib_multipath_lock);
453         if (fi->fib_power <= 0) {
454                 int power = 0;
455                 change_nexthops(fi) {
456                         if (!(nh->nh_flags&RTNH_F_DEAD)) {
457                                 power += nh->nh_weight;
458                                 nh->nh_power = nh->nh_weight;
459                         }
460                 } endfor_nexthops(fi);
461                 fi->fib_power = power;
462                 if (power < 0) {
463                         spin_unlock_bh(&dn_fib_multipath_lock);
464                         res->nh_sel = 0;
465                         return;
466                 }
467         }
468
469         w = jiffies % fi->fib_power;
470
471         change_nexthops(fi) {
472                 if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
473                         if ((w -= nh->nh_power) <= 0) {
474                                 nh->nh_power--;
475                                 fi->fib_power--;
476                                 res->nh_sel = nhsel;
477                                 spin_unlock_bh(&dn_fib_multipath_lock);
478                                 return;
479                         }
480                 }
481         } endfor_nexthops(fi);
482         res->nh_sel = 0;
483         spin_unlock_bh(&dn_fib_multipath_lock);
484 }
485
486
487 static int dn_fib_check_attr(struct rtmsg *r, struct rtattr **rta)
488 {
489         int i;
490
491         for(i = 1; i <= RTA_MAX; i++) {
492                 struct rtattr *attr = rta[i-1];
493                 if (attr) {
494                         if (RTA_PAYLOAD(attr) < 4 && RTA_PAYLOAD(attr) != 2)
495                                 return -EINVAL;
496                         if (i != RTA_MULTIPATH && i != RTA_METRICS &&
497                             i != RTA_TABLE)
498                                 rta[i-1] = (struct rtattr *)RTA_DATA(attr);
499                 }
500         }
501
502         return 0;
503 }
504
505 static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
506 {
507         struct net *net = sock_net(skb->sk);
508         struct dn_fib_table *tb;
509         struct rtattr **rta = arg;
510         struct rtmsg *r = NLMSG_DATA(nlh);
511
512         if (!net_eq(net, &init_net))
513                 return -EINVAL;
514
515         if (dn_fib_check_attr(r, rta))
516                 return -EINVAL;
517
518         tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 0);
519         if (tb)
520                 return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
521
522         return -ESRCH;
523 }
524
525 static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
526 {
527         struct net *net = sock_net(skb->sk);
528         struct dn_fib_table *tb;
529         struct rtattr **rta = arg;
530         struct rtmsg *r = NLMSG_DATA(nlh);
531
532         if (!net_eq(net, &init_net))
533                 return -EINVAL;
534
535         if (dn_fib_check_attr(r, rta))
536                 return -EINVAL;
537
538         tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 1);
539         if (tb)
540                 return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
541
542         return -ENOBUFS;
543 }
544
545 static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
546 {
547         struct dn_fib_table *tb;
548         struct {
549                 struct nlmsghdr nlh;
550                 struct rtmsg rtm;
551         } req;
552         struct dn_kern_rta rta;
553
554         memset(&req.rtm, 0, sizeof(req.rtm));
555         memset(&rta, 0, sizeof(rta));
556
557         if (type == RTN_UNICAST)
558                 tb = dn_fib_get_table(RT_MIN_TABLE, 1);
559         else
560                 tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
561
562         if (tb == NULL)
563                 return;
564
565         req.nlh.nlmsg_len = sizeof(req);
566         req.nlh.nlmsg_type = cmd;
567         req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
568         req.nlh.nlmsg_pid = 0;
569         req.nlh.nlmsg_seq = 0;
570
571         req.rtm.rtm_dst_len = dst_len;
572         req.rtm.rtm_table = tb->n;
573         req.rtm.rtm_protocol = RTPROT_KERNEL;
574         req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
575         req.rtm.rtm_type = type;
576
577         rta.rta_dst = &dst;
578         rta.rta_prefsrc = &ifa->ifa_local;
579         rta.rta_oif = &ifa->ifa_dev->dev->ifindex;
580
581         if (cmd == RTM_NEWROUTE)
582                 tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL);
583         else
584                 tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL);
585 }
586
587 static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
588 {
589
590         fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
591
592 #if 0
593         if (!(dev->flags&IFF_UP))
594                 return;
595         /* In the future, we will want to add default routes here */
596
597 #endif
598 }
599
600 static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
601 {
602         int found_it = 0;
603         struct net_device *dev;
604         struct dn_dev *dn_db;
605         struct dn_ifaddr *ifa2;
606
607         ASSERT_RTNL();
608
609         /* Scan device list */
610         rcu_read_lock();
611         for_each_netdev_rcu(&init_net, dev) {
612                 dn_db = dev->dn_ptr;
613                 if (dn_db == NULL)
614                         continue;
615                 for(ifa2 = dn_db->ifa_list; ifa2; ifa2 = ifa2->ifa_next) {
616                         if (ifa2->ifa_local == ifa->ifa_local) {
617                                 found_it = 1;
618                                 break;
619                         }
620                 }
621         }
622         rcu_read_unlock();
623
624         if (found_it == 0) {
625                 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
626
627                 if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
628                         if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
629                                 dn_fib_flush();
630                 }
631         }
632 }
633
634 static void dn_fib_disable_addr(struct net_device *dev, int force)
635 {
636         if (dn_fib_sync_down(0, dev, force))
637                 dn_fib_flush();
638         dn_rt_cache_flush(0);
639         neigh_ifdown(&dn_neigh_table, dev);
640 }
641
642 static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
643 {
644         struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
645
646         switch(event) {
647                 case NETDEV_UP:
648                         dn_fib_add_ifaddr(ifa);
649                         dn_fib_sync_up(ifa->ifa_dev->dev);
650                         dn_rt_cache_flush(-1);
651                         break;
652                 case NETDEV_DOWN:
653                         dn_fib_del_ifaddr(ifa);
654                         if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
655                                 dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
656                         } else {
657                                 dn_rt_cache_flush(-1);
658                         }
659                         break;
660         }
661         return NOTIFY_DONE;
662 }
663
664 static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force)
665 {
666         int ret = 0;
667         int scope = RT_SCOPE_NOWHERE;
668
669         if (force)
670                 scope = -1;
671
672         for_fib_info() {
673                 /*
674                  * This makes no sense for DECnet.... we will almost
675                  * certainly have more than one local address the same
676                  * over all our interfaces. It needs thinking about
677                  * some more.
678                  */
679                 if (local && fi->fib_prefsrc == local) {
680                         fi->fib_flags |= RTNH_F_DEAD;
681                         ret++;
682                 } else if (dev && fi->fib_nhs) {
683                         int dead = 0;
684
685                         change_nexthops(fi) {
686                                 if (nh->nh_flags&RTNH_F_DEAD)
687                                         dead++;
688                                 else if (nh->nh_dev == dev &&
689                                                 nh->nh_scope != scope) {
690                                         spin_lock_bh(&dn_fib_multipath_lock);
691                                         nh->nh_flags |= RTNH_F_DEAD;
692                                         fi->fib_power -= nh->nh_power;
693                                         nh->nh_power = 0;
694                                         spin_unlock_bh(&dn_fib_multipath_lock);
695                                         dead++;
696                                 }
697                         } endfor_nexthops(fi)
698                         if (dead == fi->fib_nhs) {
699                                 fi->fib_flags |= RTNH_F_DEAD;
700                                 ret++;
701                         }
702                 }
703         } endfor_fib_info();
704         return ret;
705 }
706
707
708 static int dn_fib_sync_up(struct net_device *dev)
709 {
710         int ret = 0;
711
712         if (!(dev->flags&IFF_UP))
713                 return 0;
714
715         for_fib_info() {
716                 int alive = 0;
717
718                 change_nexthops(fi) {
719                         if (!(nh->nh_flags&RTNH_F_DEAD)) {
720                                 alive++;
721                                 continue;
722                         }
723                         if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
724                                 continue;
725                         if (nh->nh_dev != dev || dev->dn_ptr == NULL)
726                                 continue;
727                         alive++;
728                         spin_lock_bh(&dn_fib_multipath_lock);
729                         nh->nh_power = 0;
730                         nh->nh_flags &= ~RTNH_F_DEAD;
731                         spin_unlock_bh(&dn_fib_multipath_lock);
732                 } endfor_nexthops(fi);
733
734                 if (alive > 0) {
735                         fi->fib_flags &= ~RTNH_F_DEAD;
736                         ret++;
737                 }
738         } endfor_fib_info();
739         return ret;
740 }
741
742 static struct notifier_block dn_fib_dnaddr_notifier = {
743         .notifier_call = dn_fib_dnaddr_event,
744 };
745
746 void __exit dn_fib_cleanup(void)
747 {
748         dn_fib_table_cleanup();
749         dn_fib_rules_cleanup();
750
751         unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
752 }
753
754
755 void __init dn_fib_init(void)
756 {
757         dn_fib_table_init();
758         dn_fib_rules_init();
759
760         register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
761
762         rtnl_register(PF_DECnet, RTM_NEWROUTE, dn_fib_rtm_newroute, NULL);
763         rtnl_register(PF_DECnet, RTM_DELROUTE, dn_fib_rtm_delroute, NULL);
764 }
765
766