Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
[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/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[RTA_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 (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
280                 goto err_inval;
281
282         if (rta->rta_mp) {
283                 nhs = dn_fib_count_nhs(rta->rta_mp);
284                 if (nhs == 0)
285                         goto err_inval;
286         }
287
288         fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
289         err = -ENOBUFS;
290         if (fi == NULL)
291                 goto failure;
292
293         fi->fib_protocol = r->rtm_protocol;
294         fi->fib_nhs = nhs;
295         fi->fib_flags = r->rtm_flags;
296         if (rta->rta_priority)
297                 fi->fib_priority = *rta->rta_priority;
298         if (rta->rta_mx) {
299                 int attrlen = RTA_PAYLOAD(rta->rta_mx);
300                 struct rtattr *attr = RTA_DATA(rta->rta_mx);
301
302                 while(RTA_OK(attr, attrlen)) {
303                         unsigned flavour = attr->rta_type;
304                         if (flavour) {
305                                 if (flavour > RTAX_MAX)
306                                         goto err_inval;
307                                 fi->fib_metrics[flavour-1] = *(unsigned*)RTA_DATA(attr);
308                         }
309                         attr = RTA_NEXT(attr, attrlen);
310                 }
311         }
312         if (rta->rta_prefsrc)
313                 memcpy(&fi->fib_prefsrc, rta->rta_prefsrc, 2);
314
315         if (rta->rta_mp) {
316                 if ((err = dn_fib_get_nhs(fi, rta->rta_mp, r)) != 0)
317                         goto failure;
318                 if (rta->rta_oif && fi->fib_nh->nh_oif != *rta->rta_oif)
319                         goto err_inval;
320                 if (rta->rta_gw && memcmp(&fi->fib_nh->nh_gw, rta->rta_gw, 2))
321                         goto err_inval;
322         } else {
323                 struct dn_fib_nh *nh = fi->fib_nh;
324                 if (rta->rta_oif)
325                         nh->nh_oif = *rta->rta_oif;
326                 if (rta->rta_gw)
327                         memcpy(&nh->nh_gw, rta->rta_gw, 2);
328                 nh->nh_flags = r->rtm_flags;
329                 nh->nh_weight = 1;
330         }
331
332         if (r->rtm_type == RTN_NAT) {
333                 if (rta->rta_gw == NULL || nhs != 1 || rta->rta_oif)
334                         goto err_inval;
335                 memcpy(&fi->fib_nh->nh_gw, rta->rta_gw, 2);
336                 goto link_it;
337         }
338
339         if (dn_fib_props[r->rtm_type].error) {
340                 if (rta->rta_gw || rta->rta_oif || rta->rta_mp)
341                         goto err_inval;
342                 goto link_it;
343         }
344
345         if (r->rtm_scope > RT_SCOPE_HOST)
346                 goto err_inval;
347
348         if (r->rtm_scope == RT_SCOPE_HOST) {
349                 struct dn_fib_nh *nh = fi->fib_nh;
350
351                 /* Local address is added */
352                 if (nhs != 1 || nh->nh_gw)
353                         goto err_inval;
354                 nh->nh_scope = RT_SCOPE_NOWHERE;
355                 nh->nh_dev = dev_get_by_index(fi->fib_nh->nh_oif);
356                 err = -ENODEV;
357                 if (nh->nh_dev == NULL)
358                         goto failure;
359         } else {
360                 change_nexthops(fi) {
361                         if ((err = dn_fib_check_nh(r, fi, nh)) != 0)
362                                 goto failure;
363                 } endfor_nexthops(fi)
364         }
365
366         if (fi->fib_prefsrc) {
367                 if (r->rtm_type != RTN_LOCAL || rta->rta_dst == NULL ||
368                     memcmp(&fi->fib_prefsrc, rta->rta_dst, 2))
369                         if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
370                                 goto err_inval;
371         }
372
373 link_it:
374         if ((ofi = dn_fib_find_info(fi)) != NULL) {
375                 fi->fib_dead = 1;
376                 dn_fib_free_info(fi);
377                 ofi->fib_treeref++;
378                 return ofi;
379         }
380
381         fi->fib_treeref++;
382         atomic_inc(&fi->fib_clntref);
383         spin_lock(&dn_fib_info_lock);
384         fi->fib_next = dn_fib_info_list;
385         fi->fib_prev = NULL;
386         if (dn_fib_info_list)
387                 dn_fib_info_list->fib_prev = fi;
388         dn_fib_info_list = fi;
389         spin_unlock(&dn_fib_info_lock);
390         return fi;
391
392 err_inval:
393         err = -EINVAL;
394
395 failure:
396         *errp = err;
397         if (fi) {
398                 fi->fib_dead = 1;
399                 dn_fib_free_info(fi);
400         }
401
402         return NULL;
403 }
404
405 int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowi *fl, struct dn_fib_res *res)
406 {
407         int err = dn_fib_props[type].error;
408
409         if (err == 0) {
410                 if (fi->fib_flags & RTNH_F_DEAD)
411                         return 1;
412
413                 res->fi = fi;
414
415                 switch(type) {
416                         case RTN_NAT:
417                                 DN_FIB_RES_RESET(*res);
418                                 atomic_inc(&fi->fib_clntref);
419                                 return 0;
420                         case RTN_UNICAST:
421                         case RTN_LOCAL:
422                                 for_nexthops(fi) {
423                                         if (nh->nh_flags & RTNH_F_DEAD)
424                                                 continue;
425                                         if (!fl->oif || fl->oif == nh->nh_oif)
426                                                 break;
427                                 }
428                                 if (nhsel < fi->fib_nhs) {
429                                         res->nh_sel = nhsel;
430                                         atomic_inc(&fi->fib_clntref);
431                                         return 0;
432                                 }
433                                 endfor_nexthops(fi);
434                                 res->fi = NULL;
435                                 return 1;
436                         default:
437                                 if (net_ratelimit())
438                                          printk("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n", type);
439                                 res->fi = NULL;
440                                 return -EINVAL;
441                 }
442         }
443         return err;
444 }
445
446 void dn_fib_select_multipath(const struct flowi *fl, struct dn_fib_res *res)
447 {
448         struct dn_fib_info *fi = res->fi;
449         int w;
450
451         spin_lock_bh(&dn_fib_multipath_lock);
452         if (fi->fib_power <= 0) {
453                 int power = 0;
454                 change_nexthops(fi) {
455                         if (!(nh->nh_flags&RTNH_F_DEAD)) {
456                                 power += nh->nh_weight;
457                                 nh->nh_power = nh->nh_weight;
458                         }
459                 } endfor_nexthops(fi);
460                 fi->fib_power = power;
461                 if (power < 0) {
462                         spin_unlock_bh(&dn_fib_multipath_lock);
463                         res->nh_sel = 0;
464                         return;
465                 }
466         }
467
468         w = jiffies % fi->fib_power;
469
470         change_nexthops(fi) {
471                 if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
472                         if ((w -= nh->nh_power) <= 0) {
473                                 nh->nh_power--;
474                                 fi->fib_power--;
475                                 res->nh_sel = nhsel;
476                                 spin_unlock_bh(&dn_fib_multipath_lock);
477                                 return;
478                         }
479                 }
480         } endfor_nexthops(fi);
481         res->nh_sel = 0;
482         spin_unlock_bh(&dn_fib_multipath_lock);
483 }
484
485
486 static int dn_fib_check_attr(struct rtmsg *r, struct rtattr **rta)
487 {
488         int i;
489
490         for(i = 1; i <= RTA_MAX; i++) {
491                 struct rtattr *attr = rta[i-1];
492                 if (attr) {
493                         if (RTA_PAYLOAD(attr) < 4 && RTA_PAYLOAD(attr) != 2)
494                                 return -EINVAL;
495                         if (i != RTA_MULTIPATH && i != RTA_METRICS &&
496                             i != RTA_TABLE)
497                                 rta[i-1] = (struct rtattr *)RTA_DATA(attr);
498                 }
499         }
500
501         return 0;
502 }
503
504 int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
505 {
506         struct dn_fib_table *tb;
507         struct rtattr **rta = arg;
508         struct rtmsg *r = NLMSG_DATA(nlh);
509
510         if (dn_fib_check_attr(r, rta))
511                 return -EINVAL;
512
513         tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 0);
514         if (tb)
515                 return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
516
517         return -ESRCH;
518 }
519
520 int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
521 {
522         struct dn_fib_table *tb;
523         struct rtattr **rta = arg;
524         struct rtmsg *r = NLMSG_DATA(nlh);
525
526         if (dn_fib_check_attr(r, rta))
527                 return -EINVAL;
528
529         tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 1);
530         if (tb) 
531                 return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
532
533         return -ENOBUFS;
534 }
535
536 static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
537 {
538         struct dn_fib_table *tb;
539         struct {
540                 struct nlmsghdr nlh;
541                 struct rtmsg rtm;
542         } req;
543         struct dn_kern_rta rta;
544
545         memset(&req.rtm, 0, sizeof(req.rtm));
546         memset(&rta, 0, sizeof(rta));
547
548         if (type == RTN_UNICAST)
549                 tb = dn_fib_get_table(RT_MIN_TABLE, 1);
550         else
551                 tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
552
553         if (tb == NULL)
554                 return;
555
556         req.nlh.nlmsg_len = sizeof(req);
557         req.nlh.nlmsg_type = cmd;
558         req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
559         req.nlh.nlmsg_pid = 0;
560         req.nlh.nlmsg_seq = 0;
561
562         req.rtm.rtm_dst_len = dst_len;
563         req.rtm.rtm_table = tb->n;
564         req.rtm.rtm_protocol = RTPROT_KERNEL;
565         req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
566         req.rtm.rtm_type = type;
567
568         rta.rta_dst = &dst;
569         rta.rta_prefsrc = &ifa->ifa_local;
570         rta.rta_oif = &ifa->ifa_dev->dev->ifindex;
571
572         if (cmd == RTM_NEWROUTE)
573                 tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL);
574         else
575                 tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL);
576 }
577
578 static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
579 {
580
581         fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
582
583 #if 0
584         if (!(dev->flags&IFF_UP))
585                 return;
586         /* In the future, we will want to add default routes here */
587
588 #endif
589 }
590
591 static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
592 {
593         int found_it = 0;
594         struct net_device *dev;
595         struct dn_dev *dn_db;
596         struct dn_ifaddr *ifa2;
597
598         ASSERT_RTNL();
599
600         /* Scan device list */
601         read_lock(&dev_base_lock);
602         for(dev = dev_base; dev; dev = dev->next) {
603                 dn_db = dev->dn_ptr;
604                 if (dn_db == NULL)
605                         continue;
606                 for(ifa2 = dn_db->ifa_list; ifa2; ifa2 = ifa2->ifa_next) {
607                         if (ifa2->ifa_local == ifa->ifa_local) {
608                                 found_it = 1;
609                                 break;
610                         }
611                 }
612         }
613         read_unlock(&dev_base_lock);
614
615         if (found_it == 0) {
616                 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
617
618                 if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
619                         if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
620                                 dn_fib_flush();
621                 }
622         }
623 }
624
625 static void dn_fib_disable_addr(struct net_device *dev, int force)
626 {
627         if (dn_fib_sync_down(0, dev, force))
628                 dn_fib_flush();
629         dn_rt_cache_flush(0);
630         neigh_ifdown(&dn_neigh_table, dev);
631 }
632
633 static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
634 {
635         struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
636
637         switch(event) {
638                 case NETDEV_UP:
639                         dn_fib_add_ifaddr(ifa);
640                         dn_fib_sync_up(ifa->ifa_dev->dev);
641                         dn_rt_cache_flush(-1);
642                         break;
643                 case NETDEV_DOWN:
644                         dn_fib_del_ifaddr(ifa);
645                         if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
646                                 dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
647                         } else {
648                                 dn_rt_cache_flush(-1);
649                         }
650                         break;
651         }
652         return NOTIFY_DONE;
653 }
654
655 static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force)
656 {
657         int ret = 0;
658         int scope = RT_SCOPE_NOWHERE;
659
660         if (force)
661                 scope = -1;
662
663         for_fib_info() {
664                 /* 
665                  * This makes no sense for DECnet.... we will almost
666                  * certainly have more than one local address the same
667                  * over all our interfaces. It needs thinking about
668                  * some more.
669                  */
670                 if (local && fi->fib_prefsrc == local) {
671                         fi->fib_flags |= RTNH_F_DEAD;
672                         ret++;
673                 } else if (dev && fi->fib_nhs) {
674                         int dead = 0;
675
676                         change_nexthops(fi) {
677                                 if (nh->nh_flags&RTNH_F_DEAD)
678                                         dead++;
679                                 else if (nh->nh_dev == dev &&
680                                                 nh->nh_scope != scope) {
681                                         spin_lock_bh(&dn_fib_multipath_lock);
682                                         nh->nh_flags |= RTNH_F_DEAD;
683                                         fi->fib_power -= nh->nh_power;
684                                         nh->nh_power = 0;
685                                         spin_unlock_bh(&dn_fib_multipath_lock);
686                                         dead++;
687                                 }
688                         } endfor_nexthops(fi)
689                         if (dead == fi->fib_nhs) {
690                                 fi->fib_flags |= RTNH_F_DEAD;
691                                 ret++;
692                         }
693                 }
694         } endfor_fib_info();
695         return ret;
696 }
697
698
699 static int dn_fib_sync_up(struct net_device *dev)
700 {
701         int ret = 0;
702
703         if (!(dev->flags&IFF_UP))
704                 return 0;
705
706         for_fib_info() {
707                 int alive = 0;
708
709                 change_nexthops(fi) {
710                         if (!(nh->nh_flags&RTNH_F_DEAD)) {
711                                 alive++;
712                                 continue;
713                         }
714                         if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
715                                 continue;
716                         if (nh->nh_dev != dev || dev->dn_ptr == NULL)
717                                 continue;
718                         alive++;
719                         spin_lock_bh(&dn_fib_multipath_lock);
720                         nh->nh_power = 0;
721                         nh->nh_flags &= ~RTNH_F_DEAD;
722                         spin_unlock_bh(&dn_fib_multipath_lock);
723                 } endfor_nexthops(fi);
724
725                 if (alive > 0) {
726                         fi->fib_flags &= ~RTNH_F_DEAD;
727                         ret++;
728                 }
729         } endfor_fib_info();
730         return ret;
731 }
732
733 static struct notifier_block dn_fib_dnaddr_notifier = {
734         .notifier_call = dn_fib_dnaddr_event,
735 };
736
737 void __exit dn_fib_cleanup(void)
738 {
739         dn_fib_table_cleanup();
740         dn_fib_rules_cleanup();
741
742         unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
743 }
744
745
746 void __init dn_fib_init(void)
747 {
748
749         dn_fib_table_init();
750         dn_fib_rules_init();
751
752         register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
753 }
754
755