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[IPV6] NDISC: Add proxy_ndp sysctl.
[hh.org.git] / net / decnet / dn_fib.c
blob1cf010124ec5ab6a96b2cd22b65171945af2a885
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
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