[NET]: Rework dev_base via list_head (v3)
[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                 memset(&fl, 0, sizeof(fl));
207
208                 if (nh->nh_flags&RTNH_F_ONLINK) {
209                         struct net_device *dev;
210
211                         if (r->rtm_scope >= RT_SCOPE_LINK)
212                                 return -EINVAL;
213                         if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST)
214                                 return -EINVAL;
215                         if ((dev = __dev_get_by_index(nh->nh_oif)) == NULL)
216                                 return -ENODEV;
217                         if (!(dev->flags&IFF_UP))
218                                 return -ENETDOWN;
219                         nh->nh_dev = dev;
220                         dev_hold(dev);
221                         nh->nh_scope = RT_SCOPE_LINK;
222                         return 0;
223                 }
224
225                 memset(&fl, 0, sizeof(fl));
226                 fl.fld_dst = nh->nh_gw;
227                 fl.oif = nh->nh_oif;
228                 fl.fld_scope = r->rtm_scope + 1;
229
230                 if (fl.fld_scope < RT_SCOPE_LINK)
231                         fl.fld_scope = RT_SCOPE_LINK;
232
233                 if ((err = dn_fib_lookup(&fl, &res)) != 0)
234                         return err;
235
236                 err = -EINVAL;
237                 if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
238                         goto out;
239                 nh->nh_scope = res.scope;
240                 nh->nh_oif = DN_FIB_RES_OIF(res);
241                 nh->nh_dev = DN_FIB_RES_DEV(res);
242                 if (nh->nh_dev == NULL)
243                         goto out;
244                 dev_hold(nh->nh_dev);
245                 err = -ENETDOWN;
246                 if (!(nh->nh_dev->flags & IFF_UP))
247                         goto out;
248                 err = 0;
249 out:
250                 dn_fib_res_put(&res);
251                 return err;
252         } else {
253                 struct net_device *dev;
254
255                 if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK))
256                         return -EINVAL;
257
258                 dev = __dev_get_by_index(nh->nh_oif);
259                 if (dev == NULL || dev->dn_ptr == NULL)
260                         return -ENODEV;
261                 if (!(dev->flags&IFF_UP))
262                         return -ENETDOWN;
263                 nh->nh_dev = dev;
264                 dev_hold(nh->nh_dev);
265                 nh->nh_scope = RT_SCOPE_HOST;
266         }
267
268         return 0;
269 }
270
271
272 struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct dn_kern_rta *rta, const struct nlmsghdr *nlh, int *errp)
273 {
274         int err;
275         struct dn_fib_info *fi = NULL;
276         struct dn_fib_info *ofi;
277         int nhs = 1;
278
279         if (r->rtm_type > RTN_MAX)
280                 goto err_inval;
281
282         if (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
283                 goto err_inval;
284
285         if (rta->rta_mp) {
286                 nhs = dn_fib_count_nhs(rta->rta_mp);
287                 if (nhs == 0)
288                         goto err_inval;
289         }
290
291         fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
292         err = -ENOBUFS;
293         if (fi == NULL)
294                 goto failure;
295
296         fi->fib_protocol = r->rtm_protocol;
297         fi->fib_nhs = nhs;
298         fi->fib_flags = r->rtm_flags;
299         if (rta->rta_priority)
300                 fi->fib_priority = *rta->rta_priority;
301         if (rta->rta_mx) {
302                 int attrlen = RTA_PAYLOAD(rta->rta_mx);
303                 struct rtattr *attr = RTA_DATA(rta->rta_mx);
304
305                 while(RTA_OK(attr, attrlen)) {
306                         unsigned flavour = attr->rta_type;
307                         if (flavour) {
308                                 if (flavour > RTAX_MAX)
309                                         goto err_inval;
310                                 fi->fib_metrics[flavour-1] = *(unsigned*)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(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 flowi *fl, 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 (!fl->oif || fl->oif == nh->nh_oif)
429                                                 break;
430                                 }
431                                 if (nhsel < fi->fib_nhs) {
432                                         res->nh_sel = nhsel;
433                                         atomic_inc(&fi->fib_clntref);
434                                         return 0;
435                                 }
436                                 endfor_nexthops(fi);
437                                 res->fi = NULL;
438                                 return 1;
439                         default:
440                                 if (net_ratelimit())
441                                          printk("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n", type);
442                                 res->fi = NULL;
443                                 return -EINVAL;
444                 }
445         }
446         return err;
447 }
448
449 void dn_fib_select_multipath(const struct flowi *fl, struct dn_fib_res *res)
450 {
451         struct dn_fib_info *fi = res->fi;
452         int w;
453
454         spin_lock_bh(&dn_fib_multipath_lock);
455         if (fi->fib_power <= 0) {
456                 int power = 0;
457                 change_nexthops(fi) {
458                         if (!(nh->nh_flags&RTNH_F_DEAD)) {
459                                 power += nh->nh_weight;
460                                 nh->nh_power = nh->nh_weight;
461                         }
462                 } endfor_nexthops(fi);
463                 fi->fib_power = power;
464                 if (power < 0) {
465                         spin_unlock_bh(&dn_fib_multipath_lock);
466                         res->nh_sel = 0;
467                         return;
468                 }
469         }
470
471         w = jiffies % fi->fib_power;
472
473         change_nexthops(fi) {
474                 if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
475                         if ((w -= nh->nh_power) <= 0) {
476                                 nh->nh_power--;
477                                 fi->fib_power--;
478                                 res->nh_sel = nhsel;
479                                 spin_unlock_bh(&dn_fib_multipath_lock);
480                                 return;
481                         }
482                 }
483         } endfor_nexthops(fi);
484         res->nh_sel = 0;
485         spin_unlock_bh(&dn_fib_multipath_lock);
486 }
487
488
489 static int dn_fib_check_attr(struct rtmsg *r, struct rtattr **rta)
490 {
491         int i;
492
493         for(i = 1; i <= RTA_MAX; i++) {
494                 struct rtattr *attr = rta[i-1];
495                 if (attr) {
496                         if (RTA_PAYLOAD(attr) < 4 && RTA_PAYLOAD(attr) != 2)
497                                 return -EINVAL;
498                         if (i != RTA_MULTIPATH && i != RTA_METRICS &&
499                             i != RTA_TABLE)
500                                 rta[i-1] = (struct rtattr *)RTA_DATA(attr);
501                 }
502         }
503
504         return 0;
505 }
506
507 static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
508 {
509         struct dn_fib_table *tb;
510         struct rtattr **rta = arg;
511         struct rtmsg *r = NLMSG_DATA(nlh);
512
513         if (dn_fib_check_attr(r, rta))
514                 return -EINVAL;
515
516         tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 0);
517         if (tb)
518                 return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
519
520         return -ESRCH;
521 }
522
523 static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
524 {
525         struct dn_fib_table *tb;
526         struct rtattr **rta = arg;
527         struct rtmsg *r = NLMSG_DATA(nlh);
528
529         if (dn_fib_check_attr(r, rta))
530                 return -EINVAL;
531
532         tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 1);
533         if (tb)
534                 return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
535
536         return -ENOBUFS;
537 }
538
539 static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
540 {
541         struct dn_fib_table *tb;
542         struct {
543                 struct nlmsghdr nlh;
544                 struct rtmsg rtm;
545         } req;
546         struct dn_kern_rta rta;
547
548         memset(&req.rtm, 0, sizeof(req.rtm));
549         memset(&rta, 0, sizeof(rta));
550
551         if (type == RTN_UNICAST)
552                 tb = dn_fib_get_table(RT_MIN_TABLE, 1);
553         else
554                 tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
555
556         if (tb == NULL)
557                 return;
558
559         req.nlh.nlmsg_len = sizeof(req);
560         req.nlh.nlmsg_type = cmd;
561         req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
562         req.nlh.nlmsg_pid = 0;
563         req.nlh.nlmsg_seq = 0;
564
565         req.rtm.rtm_dst_len = dst_len;
566         req.rtm.rtm_table = tb->n;
567         req.rtm.rtm_protocol = RTPROT_KERNEL;
568         req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
569         req.rtm.rtm_type = type;
570
571         rta.rta_dst = &dst;
572         rta.rta_prefsrc = &ifa->ifa_local;
573         rta.rta_oif = &ifa->ifa_dev->dev->ifindex;
574
575         if (cmd == RTM_NEWROUTE)
576                 tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL);
577         else
578                 tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL);
579 }
580
581 static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
582 {
583
584         fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
585
586 #if 0
587         if (!(dev->flags&IFF_UP))
588                 return;
589         /* In the future, we will want to add default routes here */
590
591 #endif
592 }
593
594 static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
595 {
596         int found_it = 0;
597         struct net_device *dev;
598         struct dn_dev *dn_db;
599         struct dn_ifaddr *ifa2;
600
601         ASSERT_RTNL();
602
603         /* Scan device list */
604         read_lock(&dev_base_lock);
605         for_each_netdev(dev) {
606                 dn_db = dev->dn_ptr;
607                 if (dn_db == NULL)
608                         continue;
609                 for(ifa2 = dn_db->ifa_list; ifa2; ifa2 = ifa2->ifa_next) {
610                         if (ifa2->ifa_local == ifa->ifa_local) {
611                                 found_it = 1;
612                                 break;
613                         }
614                 }
615         }
616         read_unlock(&dev_base_lock);
617
618         if (found_it == 0) {
619                 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
620
621                 if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
622                         if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
623                                 dn_fib_flush();
624                 }
625         }
626 }
627
628 static void dn_fib_disable_addr(struct net_device *dev, int force)
629 {
630         if (dn_fib_sync_down(0, dev, force))
631                 dn_fib_flush();
632         dn_rt_cache_flush(0);
633         neigh_ifdown(&dn_neigh_table, dev);
634 }
635
636 static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
637 {
638         struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
639
640         switch(event) {
641                 case NETDEV_UP:
642                         dn_fib_add_ifaddr(ifa);
643                         dn_fib_sync_up(ifa->ifa_dev->dev);
644                         dn_rt_cache_flush(-1);
645                         break;
646                 case NETDEV_DOWN:
647                         dn_fib_del_ifaddr(ifa);
648                         if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
649                                 dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
650                         } else {
651                                 dn_rt_cache_flush(-1);
652                         }
653                         break;
654         }
655         return NOTIFY_DONE;
656 }
657
658 static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force)
659 {
660         int ret = 0;
661         int scope = RT_SCOPE_NOWHERE;
662
663         if (force)
664                 scope = -1;
665
666         for_fib_info() {
667                 /*
668                  * This makes no sense for DECnet.... we will almost
669                  * certainly have more than one local address the same
670                  * over all our interfaces. It needs thinking about
671                  * some more.
672                  */
673                 if (local && fi->fib_prefsrc == local) {
674                         fi->fib_flags |= RTNH_F_DEAD;
675                         ret++;
676                 } else if (dev && fi->fib_nhs) {
677                         int dead = 0;
678
679                         change_nexthops(fi) {
680                                 if (nh->nh_flags&RTNH_F_DEAD)
681                                         dead++;
682                                 else if (nh->nh_dev == dev &&
683                                                 nh->nh_scope != scope) {
684                                         spin_lock_bh(&dn_fib_multipath_lock);
685                                         nh->nh_flags |= RTNH_F_DEAD;
686                                         fi->fib_power -= nh->nh_power;
687                                         nh->nh_power = 0;
688                                         spin_unlock_bh(&dn_fib_multipath_lock);
689                                         dead++;
690                                 }
691                         } endfor_nexthops(fi)
692                         if (dead == fi->fib_nhs) {
693                                 fi->fib_flags |= RTNH_F_DEAD;
694                                 ret++;
695                         }
696                 }
697         } endfor_fib_info();
698         return ret;
699 }
700
701
702 static int dn_fib_sync_up(struct net_device *dev)
703 {
704         int ret = 0;
705
706         if (!(dev->flags&IFF_UP))
707                 return 0;
708
709         for_fib_info() {
710                 int alive = 0;
711
712                 change_nexthops(fi) {
713                         if (!(nh->nh_flags&RTNH_F_DEAD)) {
714                                 alive++;
715                                 continue;
716                         }
717                         if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
718                                 continue;
719                         if (nh->nh_dev != dev || dev->dn_ptr == NULL)
720                                 continue;
721                         alive++;
722                         spin_lock_bh(&dn_fib_multipath_lock);
723                         nh->nh_power = 0;
724                         nh->nh_flags &= ~RTNH_F_DEAD;
725                         spin_unlock_bh(&dn_fib_multipath_lock);
726                 } endfor_nexthops(fi);
727
728                 if (alive > 0) {
729                         fi->fib_flags &= ~RTNH_F_DEAD;
730                         ret++;
731                 }
732         } endfor_fib_info();
733         return ret;
734 }
735
736 static struct notifier_block dn_fib_dnaddr_notifier = {
737         .notifier_call = dn_fib_dnaddr_event,
738 };
739
740 void __exit dn_fib_cleanup(void)
741 {
742         dn_fib_table_cleanup();
743         dn_fib_rules_cleanup();
744
745         unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
746 }
747
748
749 void __init dn_fib_init(void)
750 {
751         dn_fib_table_init();
752         dn_fib_rules_init();
753
754         register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
755
756         rtnl_register(PF_DECnet, RTM_NEWROUTE, dn_fib_rtm_newroute, NULL);
757         rtnl_register(PF_DECnet, RTM_DELROUTE, dn_fib_rtm_delroute, NULL);
758 }
759
760