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Merge branch 'media_fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[cris-mirror.git] / net / decnet / dn_fib.c
blob0ef0a81bcd72b24afaedebd506c255de3452dad0
1 /*
2 * DECnet An implementation of the DECnet protocol suite for the LINUX
3 * operating system. DECnet is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * DECnet Routing Forwarding Information Base (Glue/Info List)
7 *
8 * Author: Steve Whitehouse <SteveW@ACM.org>
9 *
10 *
11 * Changes:
12 * Alexey Kuznetsov : SMP locking changes
13 * Steve Whitehouse : Rewrote it... Well to be more correct, I
14 * copied most of it from the ipv4 fib code.
15 * Steve Whitehouse : Updated it in style and fixed a few bugs
16 * which were fixed in the ipv4 code since
17 * this code was copied from it.
18 *
19 */
20 #include <linux/string.h>
21 #include <linux/net.h>
22 #include <linux/socket.h>
23 #include <linux/slab.h>
24 #include <linux/sockios.h>
25 #include <linux/init.h>
26 #include <linux/skbuff.h>
27 #include <linux/netlink.h>
28 #include <linux/rtnetlink.h>
29 #include <linux/proc_fs.h>
30 #include <linux/netdevice.h>
31 #include <linux/timer.h>
32 #include <linux/spinlock.h>
33 #include <asm/atomic.h>
34 #include <asm/uaccess.h>
35 #include <net/neighbour.h>
36 #include <net/dst.h>
37 #include <net/flow.h>
38 #include <net/fib_rules.h>
39 #include <net/dn.h>
40 #include <net/dn_route.h>
41 #include <net/dn_fib.h>
42 #include <net/dn_neigh.h>
43 #include <net/dn_dev.h>
44
45 #define RT_MIN_TABLE 1
46
47 #define for_fib_info() { struct dn_fib_info *fi;\
48 for(fi = dn_fib_info_list; fi; fi = fi->fib_next)
49 #define endfor_fib_info() }
50
51 #define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
52 for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
53
54 #define change_nexthops(fi) { int nhsel; struct dn_fib_nh *nh;\
55 for(nhsel = 0, nh = (struct dn_fib_nh *)((fi)->fib_nh); nhsel < (fi)->fib_nhs; nh++, nhsel++)
56
57 #define endfor_nexthops(fi) }
58
59 static DEFINE_SPINLOCK(dn_fib_multipath_lock);
60 static struct dn_fib_info *dn_fib_info_list;
61 static DEFINE_SPINLOCK(dn_fib_info_lock);
62
63 static struct
64 {
65 int error;
66 u8 scope;
67 } dn_fib_props[RTN_MAX+1] = {
68 [RTN_UNSPEC] = { .error = 0, .scope = RT_SCOPE_NOWHERE },
69 [RTN_UNICAST] = { .error = 0, .scope = RT_SCOPE_UNIVERSE },
70 [RTN_LOCAL] = { .error = 0, .scope = RT_SCOPE_HOST },
71 [RTN_BROADCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
72 [RTN_ANYCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
73 [RTN_MULTICAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
74 [RTN_BLACKHOLE] = { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE },
75 [RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE },
76 [RTN_PROHIBIT] = { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE },
77 [RTN_THROW] = { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE },
78 [RTN_NAT] = { .error = 0, .scope = RT_SCOPE_NOWHERE },
79 [RTN_XRESOLVE] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
80 };
81
82 static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force);
83 static int dn_fib_sync_up(struct net_device *dev);
84
85 void dn_fib_free_info(struct dn_fib_info *fi)
86 {
87 if (fi->fib_dead == 0) {
88 printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n");
89 return;
90 }
91
92 change_nexthops(fi) {
93 if (nh->nh_dev)
94 dev_put(nh->nh_dev);
95 nh->nh_dev = NULL;
96 } endfor_nexthops(fi);
97 kfree(fi);
98 }
99
100 void dn_fib_release_info(struct dn_fib_info *fi)
101 {
102 spin_lock(&dn_fib_info_lock);
103 if (fi && --fi->fib_treeref == 0) {
104 if (fi->fib_next)
105 fi->fib_next->fib_prev = fi->fib_prev;
106 if (fi->fib_prev)
107 fi->fib_prev->fib_next = fi->fib_next;
108 if (fi == dn_fib_info_list)
109 dn_fib_info_list = fi->fib_next;
110 fi->fib_dead = 1;
111 dn_fib_info_put(fi);
112 }
113 spin_unlock(&dn_fib_info_lock);
114 }
115
116 static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi)
117 {
118 const struct dn_fib_nh *onh = ofi->fib_nh;
119
120 for_nexthops(fi) {
121 if (nh->nh_oif != onh->nh_oif ||
122 nh->nh_gw != onh->nh_gw ||
123 nh->nh_scope != onh->nh_scope ||
124 nh->nh_weight != onh->nh_weight ||
125 ((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD))
126 return -1;
127 onh++;
128 } endfor_nexthops(fi);
129 return 0;
130 }
131
132 static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi)
133 {
134 for_fib_info() {
135 if (fi->fib_nhs != nfi->fib_nhs)
136 continue;
137 if (nfi->fib_protocol == fi->fib_protocol &&
138 nfi->fib_prefsrc == fi->fib_prefsrc &&
139 nfi->fib_priority == fi->fib_priority &&
140 memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 &&
141 ((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 &&
142 (nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0))
143 return fi;
144 } endfor_fib_info();
145 return NULL;
146 }
147
148 __le16 dn_fib_get_attr16(struct rtattr *attr, int attrlen, int type)
149 {
150 while(RTA_OK(attr,attrlen)) {
151 if (attr->rta_type == type)
152 return *(__le16*)RTA_DATA(attr);
153 attr = RTA_NEXT(attr, attrlen);
154 }
155
156 return 0;
157 }
158
159 static int dn_fib_count_nhs(struct rtattr *rta)
160 {
161 int nhs = 0;
162 struct rtnexthop *nhp = RTA_DATA(rta);
163 int nhlen = RTA_PAYLOAD(rta);
164
165 while(nhlen >= (int)sizeof(struct rtnexthop)) {
166 if ((nhlen -= nhp->rtnh_len) < 0)
167 return 0;
168 nhs++;
169 nhp = RTNH_NEXT(nhp);
170 }
171
172 return nhs;
173 }
174
175 static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct rtattr *rta, const struct rtmsg *r)
176 {
177 struct rtnexthop *nhp = RTA_DATA(rta);
178 int nhlen = RTA_PAYLOAD(rta);
179
180 change_nexthops(fi) {
181 int attrlen = nhlen - sizeof(struct rtnexthop);
182 if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
183 return -EINVAL;
184
185 nh->nh_flags = (r->rtm_flags&~0xFF) | nhp->rtnh_flags;
186 nh->nh_oif = nhp->rtnh_ifindex;
187 nh->nh_weight = nhp->rtnh_hops + 1;
188
189 if (attrlen) {
190 nh->nh_gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
191 }
192 nhp = RTNH_NEXT(nhp);
193 } endfor_nexthops(fi);
194
195 return 0;
196 }
197
198
199 static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh)
200 {
201 int err;
202
203 if (nh->nh_gw) {
204 struct flowi fl;
205 struct dn_fib_res res;
206
207 if (nh->nh_flags&RTNH_F_ONLINK) {
208 struct net_device *dev;
209
210 if (r->rtm_scope >= RT_SCOPE_LINK)
211 return -EINVAL;
212 if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST)
213 return -EINVAL;
214 if ((dev = __dev_get_by_index(&init_net, nh->nh_oif)) == NULL)
215 return -ENODEV;
216 if (!(dev->flags&IFF_UP))
217 return -ENETDOWN;
218 nh->nh_dev = dev;
219 dev_hold(dev);
220 nh->nh_scope = RT_SCOPE_LINK;
221 return 0;
222 }
223
224 memset(&fl, 0, sizeof(fl));
225 fl.fld_dst = nh->nh_gw;
226 fl.oif = nh->nh_oif;
227 fl.fld_scope = r->rtm_scope + 1;
228
229 if (fl.fld_scope < RT_SCOPE_LINK)
230 fl.fld_scope = RT_SCOPE_LINK;
231
232 if ((err = dn_fib_lookup(&fl, &res)) != 0)
233 return err;
234
235 err = -EINVAL;
236 if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
237 goto out;
238 nh->nh_scope = res.scope;
239 nh->nh_oif = DN_FIB_RES_OIF(res);
240 nh->nh_dev = DN_FIB_RES_DEV(res);
241 if (nh->nh_dev == NULL)
242 goto out;
243 dev_hold(nh->nh_dev);
244 err = -ENETDOWN;
245 if (!(nh->nh_dev->flags & IFF_UP))
246 goto out;
247 err = 0;
248 out:
249 dn_fib_res_put(&res);
250 return err;
251 } else {
252 struct net_device *dev;
253
254 if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK))
255 return -EINVAL;
256
257 dev = __dev_get_by_index(&init_net, nh->nh_oif);
258 if (dev == NULL || dev->dn_ptr == NULL)
259 return -ENODEV;
260 if (!(dev->flags&IFF_UP))
261 return -ENETDOWN;
262 nh->nh_dev = dev;
263 dev_hold(nh->nh_dev);
264 nh->nh_scope = RT_SCOPE_HOST;
265 }
266
267 return 0;
268 }
269
270
271 struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct dn_kern_rta *rta, const struct nlmsghdr *nlh, int *errp)
272 {
273 int err;
274 struct dn_fib_info *fi = NULL;
275 struct dn_fib_info *ofi;
276 int nhs = 1;
277
278 if (r->rtm_type > RTN_MAX)
279 goto err_inval;
280
281 if (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
282 goto err_inval;
283
284 if (rta->rta_mp) {
285 nhs = dn_fib_count_nhs(rta->rta_mp);
286 if (nhs == 0)
287 goto err_inval;
288 }
289
290 fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
291 err = -ENOBUFS;
292 if (fi == NULL)
293 goto failure;
294
295 fi->fib_protocol = r->rtm_protocol;
296 fi->fib_nhs = nhs;
297 fi->fib_flags = r->rtm_flags;
298 if (rta->rta_priority)
299 fi->fib_priority = *rta->rta_priority;
300 if (rta->rta_mx) {
301 int attrlen = RTA_PAYLOAD(rta->rta_mx);
302 struct rtattr *attr = RTA_DATA(rta->rta_mx);
303
304 while(RTA_OK(attr, attrlen)) {
305 unsigned flavour = attr->rta_type;
306 if (flavour) {
307 if (flavour > RTAX_MAX)
308 goto err_inval;
309 fi->fib_metrics[flavour-1] = *(unsigned*)RTA_DATA(attr);
310 }
311 attr = RTA_NEXT(attr, attrlen);
312 }
313 }
314 if (rta->rta_prefsrc)
315 memcpy(&fi->fib_prefsrc, rta->rta_prefsrc, 2);
316
317 if (rta->rta_mp) {
318 if ((err = dn_fib_get_nhs(fi, rta->rta_mp, r)) != 0)
319 goto failure;
320 if (rta->rta_oif && fi->fib_nh->nh_oif != *rta->rta_oif)
321 goto err_inval;
322 if (rta->rta_gw && memcmp(&fi->fib_nh->nh_gw, rta->rta_gw, 2))
323 goto err_inval;
324 } else {
325 struct dn_fib_nh *nh = fi->fib_nh;
326 if (rta->rta_oif)
327 nh->nh_oif = *rta->rta_oif;
328 if (rta->rta_gw)
329 memcpy(&nh->nh_gw, rta->rta_gw, 2);
330 nh->nh_flags = r->rtm_flags;
331 nh->nh_weight = 1;
332 }
333
334 if (r->rtm_type == RTN_NAT) {
335 if (rta->rta_gw == NULL || nhs != 1 || rta->rta_oif)
336 goto err_inval;
337 memcpy(&fi->fib_nh->nh_gw, rta->rta_gw, 2);
338 goto link_it;
339 }
340
341 if (dn_fib_props[r->rtm_type].error) {
342 if (rta->rta_gw || rta->rta_oif || rta->rta_mp)
343 goto err_inval;
344 goto link_it;
345 }
346
347 if (r->rtm_scope > RT_SCOPE_HOST)
348 goto err_inval;
349
350 if (r->rtm_scope == RT_SCOPE_HOST) {
351 struct dn_fib_nh *nh = fi->fib_nh;
352
353 /* Local address is added */
354 if (nhs != 1 || nh->nh_gw)
355 goto err_inval;
356 nh->nh_scope = RT_SCOPE_NOWHERE;
357 nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif);
358 err = -ENODEV;
359 if (nh->nh_dev == NULL)
360 goto failure;
361 } else {
362 change_nexthops(fi) {
363 if ((err = dn_fib_check_nh(r, fi, nh)) != 0)
364 goto failure;
365 } endfor_nexthops(fi)
366 }
367
368 if (fi->fib_prefsrc) {
369 if (r->rtm_type != RTN_LOCAL || rta->rta_dst == NULL ||
370 memcmp(&fi->fib_prefsrc, rta->rta_dst, 2))
371 if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
372 goto err_inval;
373 }
374
375 link_it:
376 if ((ofi = dn_fib_find_info(fi)) != NULL) {
377 fi->fib_dead = 1;
378 dn_fib_free_info(fi);
379 ofi->fib_treeref++;
380 return ofi;
381 }
382
383 fi->fib_treeref++;
384 atomic_inc(&fi->fib_clntref);
385 spin_lock(&dn_fib_info_lock);
386 fi->fib_next = dn_fib_info_list;
387 fi->fib_prev = NULL;
388 if (dn_fib_info_list)
389 dn_fib_info_list->fib_prev = fi;
390 dn_fib_info_list = fi;
391 spin_unlock(&dn_fib_info_lock);
392 return fi;
393
394 err_inval:
395 err = -EINVAL;
396
397 failure:
398 *errp = err;
399 if (fi) {
400 fi->fib_dead = 1;
401 dn_fib_free_info(fi);
402 }
403
404 return NULL;
405 }
406
407 int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowi *fl, struct dn_fib_res *res)
408 {
409 int err = dn_fib_props[type].error;
410
411 if (err == 0) {
412 if (fi->fib_flags & RTNH_F_DEAD)
413 return 1;
414
415 res->fi = fi;
416
417 switch(type) {
418 case RTN_NAT:
419 DN_FIB_RES_RESET(*res);
420 atomic_inc(&fi->fib_clntref);
421 return 0;
422 case RTN_UNICAST:
423 case RTN_LOCAL:
424 for_nexthops(fi) {
425 if (nh->nh_flags & RTNH_F_DEAD)
426 continue;
427 if (!fl->oif || fl->oif == nh->nh_oif)
428 break;
429 }
430 if (nhsel < fi->fib_nhs) {
431 res->nh_sel = nhsel;
432 atomic_inc(&fi->fib_clntref);
433 return 0;
434 }
435 endfor_nexthops(fi);
436 res->fi = NULL;
437 return 1;
438 default:
439 if (net_ratelimit())
440 printk("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n", type);
441 res->fi = NULL;
442 return -EINVAL;
443 }
444 }
445 return err;
446 }
447
448 void dn_fib_select_multipath(const struct flowi *fl, struct dn_fib_res *res)
449 {
450 struct dn_fib_info *fi = res->fi;
451 int w;
452
453 spin_lock_bh(&dn_fib_multipath_lock);
454 if (fi->fib_power <= 0) {
455 int power = 0;
456 change_nexthops(fi) {
457 if (!(nh->nh_flags&RTNH_F_DEAD)) {
458 power += nh->nh_weight;
459 nh->nh_power = nh->nh_weight;
460 }
461 } endfor_nexthops(fi);
462 fi->fib_power = power;
463 if (power < 0) {
464 spin_unlock_bh(&dn_fib_multipath_lock);
465 res->nh_sel = 0;
466 return;
467 }
468 }
469
470 w = jiffies % fi->fib_power;
471
472 change_nexthops(fi) {
473 if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
474 if ((w -= nh->nh_power) <= 0) {
475 nh->nh_power--;
476 fi->fib_power--;
477 res->nh_sel = nhsel;
478 spin_unlock_bh(&dn_fib_multipath_lock);
479 return;
480 }
481 }
482 } endfor_nexthops(fi);
483 res->nh_sel = 0;
484 spin_unlock_bh(&dn_fib_multipath_lock);
485 }
486
487
488 static int dn_fib_check_attr(struct rtmsg *r, struct rtattr **rta)
489 {
490 int i;
491
492 for(i = 1; i <= RTA_MAX; i++) {
493 struct rtattr *attr = rta[i-1];
494 if (attr) {
495 if (RTA_PAYLOAD(attr) < 4 && RTA_PAYLOAD(attr) != 2)
496 return -EINVAL;
497 if (i != RTA_MULTIPATH && i != RTA_METRICS &&
498 i != RTA_TABLE)
499 rta[i-1] = (struct rtattr *)RTA_DATA(attr);
500 }
501 }
502
503 return 0;
504 }
505
506 static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
507 {
508 struct net *net = sock_net(skb->sk);
509 struct dn_fib_table *tb;
510 struct rtattr **rta = arg;
511 struct rtmsg *r = NLMSG_DATA(nlh);
512
513 if (!net_eq(net, &init_net))
514 return -EINVAL;
515
516 if (dn_fib_check_attr(r, rta))
517 return -EINVAL;
518
519 tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 0);
520 if (tb)
521 return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
522
523 return -ESRCH;
524 }
525
526 static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
527 {
528 struct net *net = sock_net(skb->sk);
529 struct dn_fib_table *tb;
530 struct rtattr **rta = arg;
531 struct rtmsg *r = NLMSG_DATA(nlh);
532
533 if (!net_eq(net, &init_net))
534 return -EINVAL;
535
536 if (dn_fib_check_attr(r, rta))
537 return -EINVAL;
538
539 tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 1);
540 if (tb)
541 return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
542
543 return -ENOBUFS;
544 }
545
546 static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
547 {
548 struct dn_fib_table *tb;
549 struct {
550 struct nlmsghdr nlh;
551 struct rtmsg rtm;
552 } req;
553 struct dn_kern_rta rta;
554
555 memset(&req.rtm, 0, sizeof(req.rtm));
556 memset(&rta, 0, sizeof(rta));
557
558 if (type == RTN_UNICAST)
559 tb = dn_fib_get_table(RT_MIN_TABLE, 1);
560 else
561 tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
562
563 if (tb == NULL)
564 return;
565
566 req.nlh.nlmsg_len = sizeof(req);
567 req.nlh.nlmsg_type = cmd;
568 req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
569 req.nlh.nlmsg_pid = 0;
570 req.nlh.nlmsg_seq = 0;
571
572 req.rtm.rtm_dst_len = dst_len;
573 req.rtm.rtm_table = tb->n;
574 req.rtm.rtm_protocol = RTPROT_KERNEL;
575 req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
576 req.rtm.rtm_type = type;
577
578 rta.rta_dst = &dst;
579 rta.rta_prefsrc = &ifa->ifa_local;
580 rta.rta_oif = &ifa->ifa_dev->dev->ifindex;
581
582 if (cmd == RTM_NEWROUTE)
583 tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL);
584 else
585 tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL);
586 }
587
588 static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
589 {
590
591 fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
592
593 #if 0
594 if (!(dev->flags&IFF_UP))
595 return;
596 /* In the future, we will want to add default routes here */
597
598 #endif
599 }
600
601 static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
602 {
603 int found_it = 0;
604 struct net_device *dev;
605 struct dn_dev *dn_db;
606 struct dn_ifaddr *ifa2;
607
608 ASSERT_RTNL();
609
610 /* Scan device list */
611 rcu_read_lock();
612 for_each_netdev_rcu(&init_net, dev) {
613 dn_db = rcu_dereference(dev->dn_ptr);
614 if (dn_db == NULL)
615 continue;
616 for (ifa2 = rcu_dereference(dn_db->ifa_list);
617 ifa2 != NULL;
618 ifa2 = rcu_dereference(ifa2->ifa_next)) {
619 if (ifa2->ifa_local == ifa->ifa_local) {
620 found_it = 1;
621 break;
622 }
623 }
624 }
625 rcu_read_unlock();
626
627 if (found_it == 0) {
628 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
629
630 if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
631 if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
632 dn_fib_flush();
633 }
634 }
635 }
636
637 static void dn_fib_disable_addr(struct net_device *dev, int force)
638 {
639 if (dn_fib_sync_down(0, dev, force))
640 dn_fib_flush();
641 dn_rt_cache_flush(0);
642 neigh_ifdown(&dn_neigh_table, dev);
643 }
644
645 static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
646 {
647 struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
648
649 switch(event) {
650 case NETDEV_UP:
651 dn_fib_add_ifaddr(ifa);
652 dn_fib_sync_up(ifa->ifa_dev->dev);
653 dn_rt_cache_flush(-1);
654 break;
655 case NETDEV_DOWN:
656 dn_fib_del_ifaddr(ifa);
657 if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
658 dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
659 } else {
660 dn_rt_cache_flush(-1);
661 }
662 break;
663 }
664 return NOTIFY_DONE;
665 }
666
667 static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force)
668 {
669 int ret = 0;
670 int scope = RT_SCOPE_NOWHERE;
671
672 if (force)
673 scope = -1;
674
675 for_fib_info() {
676 /*
677 * This makes no sense for DECnet.... we will almost
678 * certainly have more than one local address the same
679 * over all our interfaces. It needs thinking about
680 * some more.
681 */
682 if (local && fi->fib_prefsrc == local) {
683 fi->fib_flags |= RTNH_F_DEAD;
684 ret++;
685 } else if (dev && fi->fib_nhs) {
686 int dead = 0;
687
688 change_nexthops(fi) {
689 if (nh->nh_flags&RTNH_F_DEAD)
690 dead++;
691 else if (nh->nh_dev == dev &&
692 nh->nh_scope != scope) {
693 spin_lock_bh(&dn_fib_multipath_lock);
694 nh->nh_flags |= RTNH_F_DEAD;
695 fi->fib_power -= nh->nh_power;
696 nh->nh_power = 0;
697 spin_unlock_bh(&dn_fib_multipath_lock);
698 dead++;
699 }
700 } endfor_nexthops(fi)
701 if (dead == fi->fib_nhs) {
702 fi->fib_flags |= RTNH_F_DEAD;
703 ret++;
704 }
705 }
706 } endfor_fib_info();
707 return ret;
708 }
709
710
711 static int dn_fib_sync_up(struct net_device *dev)
712 {
713 int ret = 0;
714
715 if (!(dev->flags&IFF_UP))
716 return 0;
717
718 for_fib_info() {
719 int alive = 0;
720
721 change_nexthops(fi) {
722 if (!(nh->nh_flags&RTNH_F_DEAD)) {
723 alive++;
724 continue;
725 }
726 if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
727 continue;
728 if (nh->nh_dev != dev || dev->dn_ptr == NULL)
729 continue;
730 alive++;
731 spin_lock_bh(&dn_fib_multipath_lock);
732 nh->nh_power = 0;
733 nh->nh_flags &= ~RTNH_F_DEAD;
734 spin_unlock_bh(&dn_fib_multipath_lock);
735 } endfor_nexthops(fi);
736
737 if (alive > 0) {
738 fi->fib_flags &= ~RTNH_F_DEAD;
739 ret++;
740 }
741 } endfor_fib_info();
742 return ret;
743 }
744
745 static struct notifier_block dn_fib_dnaddr_notifier = {
746 .notifier_call = dn_fib_dnaddr_event,
747 };
748
749 void __exit dn_fib_cleanup(void)
750 {
751 dn_fib_table_cleanup();
752 dn_fib_rules_cleanup();
753
754 unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
755 }
756
757
758 void __init dn_fib_init(void)
759 {
760 dn_fib_table_init();
761 dn_fib_rules_init();
762
763 register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
764
765 rtnl_register(PF_DECnet, RTM_NEWROUTE, dn_fib_rtm_newroute, NULL);
766 rtnl_register(PF_DECnet, RTM_DELROUTE, dn_fib_rtm_delroute, NULL);
767 }
768
769
CRIS linux kernel tree