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Linux-2.6.12-rc2
[mirror_ubuntu-artful-kernel.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/config.h>
21 #include <linux/string.h>
22 #include <linux/net.h>
23 #include <linux/socket.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/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 extern int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb);
59
60 static DEFINE_SPINLOCK(dn_fib_multipath_lock);
61 static struct dn_fib_info *dn_fib_info_list;
62 static DEFINE_RWLOCK(dn_fib_info_lock);
63
64 static struct
65 {
66 int error;
67 u8 scope;
68 } dn_fib_props[RTA_MAX+1] = {
69 [RTN_UNSPEC] = { .error = 0, .scope = RT_SCOPE_NOWHERE },
70 [RTN_UNICAST] = { .error = 0, .scope = RT_SCOPE_UNIVERSE },
71 [RTN_LOCAL] = { .error = 0, .scope = RT_SCOPE_HOST },
72 [RTN_BROADCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
73 [RTN_ANYCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
74 [RTN_MULTICAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
75 [RTN_BLACKHOLE] = { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE },
76 [RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE },
77 [RTN_PROHIBIT] = { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE },
78 [RTN_THROW] = { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE },
79 [RTN_NAT] = { .error = 0, .scope = RT_SCOPE_NOWHERE },
80 [RTN_XRESOLVE] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
81 };
82
83 void dn_fib_free_info(struct dn_fib_info *fi)
84 {
85 if (fi->fib_dead == 0) {
86 printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n");
87 return;
88 }
89
90 change_nexthops(fi) {
91 if (nh->nh_dev)
92 dev_put(nh->nh_dev);
93 nh->nh_dev = NULL;
94 } endfor_nexthops(fi);
95 kfree(fi);
96 }
97
98 void dn_fib_release_info(struct dn_fib_info *fi)
99 {
100 write_lock(&dn_fib_info_lock);
101 if (fi && --fi->fib_treeref == 0) {
102 if (fi->fib_next)
103 fi->fib_next->fib_prev = fi->fib_prev;
104 if (fi->fib_prev)
105 fi->fib_prev->fib_next = fi->fib_next;
106 if (fi == dn_fib_info_list)
107 dn_fib_info_list = fi->fib_next;
108 fi->fib_dead = 1;
109 dn_fib_info_put(fi);
110 }
111 write_unlock(&dn_fib_info_lock);
112 }
113
114 static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi)
115 {
116 const struct dn_fib_nh *onh = ofi->fib_nh;
117
118 for_nexthops(fi) {
119 if (nh->nh_oif != onh->nh_oif ||
120 nh->nh_gw != onh->nh_gw ||
121 nh->nh_scope != onh->nh_scope ||
122 nh->nh_weight != onh->nh_weight ||
123 ((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD))
124 return -1;
125 onh++;
126 } endfor_nexthops(fi);
127 return 0;
128 }
129
130 static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi)
131 {
132 for_fib_info() {
133 if (fi->fib_nhs != nfi->fib_nhs)
134 continue;
135 if (nfi->fib_protocol == fi->fib_protocol &&
136 nfi->fib_prefsrc == fi->fib_prefsrc &&
137 nfi->fib_priority == fi->fib_priority &&
138 memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 &&
139 ((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 &&
140 (nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0))
141 return fi;
142 } endfor_fib_info();
143 return NULL;
144 }
145
146 u16 dn_fib_get_attr16(struct rtattr *attr, int attrlen, int type)
147 {
148 while(RTA_OK(attr,attrlen)) {
149 if (attr->rta_type == type)
150 return *(u16*)RTA_DATA(attr);
151 attr = RTA_NEXT(attr, attrlen);
152 }
153
154 return 0;
155 }
156
157 static int dn_fib_count_nhs(struct rtattr *rta)
158 {
159 int nhs = 0;
160 struct rtnexthop *nhp = RTA_DATA(rta);
161 int nhlen = RTA_PAYLOAD(rta);
162
163 while(nhlen >= (int)sizeof(struct rtnexthop)) {
164 if ((nhlen -= nhp->rtnh_len) < 0)
165 return 0;
166 nhs++;
167 nhp = RTNH_NEXT(nhp);
168 }
169
170 return nhs;
171 }
172
173 static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct rtattr *rta, const struct rtmsg *r)
174 {
175 struct rtnexthop *nhp = RTA_DATA(rta);
176 int nhlen = RTA_PAYLOAD(rta);
177
178 change_nexthops(fi) {
179 int attrlen = nhlen - sizeof(struct rtnexthop);
180 if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
181 return -EINVAL;
182
183 nh->nh_flags = (r->rtm_flags&~0xFF) | nhp->rtnh_flags;
184 nh->nh_oif = nhp->rtnh_ifindex;
185 nh->nh_weight = nhp->rtnh_hops + 1;
186
187 if (attrlen) {
188 nh->nh_gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
189 }
190 nhp = RTNH_NEXT(nhp);
191 } endfor_nexthops(fi);
192
193 return 0;
194 }
195
196
197 static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh)
198 {
199 int err;
200
201 if (nh->nh_gw) {
202 struct flowi fl;
203 struct dn_fib_res res;
204
205 memset(&fl, 0, sizeof(fl));
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(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(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 (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
279 goto err_inval;
280
281 if (rta->rta_mp) {
282 nhs = dn_fib_count_nhs(rta->rta_mp);
283 if (nhs == 0)
284 goto err_inval;
285 }
286
287 fi = kmalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
288 err = -ENOBUFS;
289 if (fi == NULL)
290 goto failure;
291 memset(fi, 0, sizeof(*fi)+nhs*sizeof(struct dn_fib_nh));
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 write_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 write_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 rta[i-1] = (struct rtattr *)RTA_DATA(attr);
497 }
498 }
499
500 return 0;
501 }
502
503 int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
504 {
505 struct dn_fib_table *tb;
506 struct rtattr **rta = arg;
507 struct rtmsg *r = NLMSG_DATA(nlh);
508
509 if (dn_fib_check_attr(r, rta))
510 return -EINVAL;
511
512 tb = dn_fib_get_table(r->rtm_table, 0);
513 if (tb)
514 return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
515
516 return -ESRCH;
517 }
518
519 int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
520 {
521 struct dn_fib_table *tb;
522 struct rtattr **rta = arg;
523 struct rtmsg *r = NLMSG_DATA(nlh);
524
525 if (dn_fib_check_attr(r, rta))
526 return -EINVAL;
527
528 tb = dn_fib_get_table(r->rtm_table, 1);
529 if (tb)
530 return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
531
532 return -ENOBUFS;
533 }
534
535
536 int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb)
537 {
538 int t;
539 int s_t;
540 struct dn_fib_table *tb;
541
542 if (NLMSG_PAYLOAD(cb->nlh, 0) >= sizeof(struct rtmsg) &&
543 ((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED)
544 return dn_cache_dump(skb, cb);
545
546 s_t = cb->args[0];
547 if (s_t == 0)
548 s_t = cb->args[0] = RT_MIN_TABLE;
549
550 for(t = s_t; t <= RT_TABLE_MAX; t++) {
551 if (t < s_t)
552 continue;
553 if (t > s_t)
554 memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(int));
555 tb = dn_fib_get_table(t, 0);
556 if (tb == NULL)
557 continue;
558 if (tb->dump(tb, skb, cb) < 0)
559 break;
560 }
561
562 cb->args[0] = t;
563
564 return skb->len;
565 }
566
567 static void fib_magic(int cmd, int type, __u16 dst, int dst_len, struct dn_ifaddr *ifa)
568 {
569 struct dn_fib_table *tb;
570 struct {
571 struct nlmsghdr nlh;
572 struct rtmsg rtm;
573 } req;
574 struct dn_kern_rta rta;
575
576 memset(&req.rtm, 0, sizeof(req.rtm));
577 memset(&rta, 0, sizeof(rta));
578
579 if (type == RTN_UNICAST)
580 tb = dn_fib_get_table(RT_MIN_TABLE, 1);
581 else
582 tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
583
584 if (tb == NULL)
585 return;
586
587 req.nlh.nlmsg_len = sizeof(req);
588 req.nlh.nlmsg_type = cmd;
589 req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
590 req.nlh.nlmsg_pid = 0;
591 req.nlh.nlmsg_seq = 0;
592
593 req.rtm.rtm_dst_len = dst_len;
594 req.rtm.rtm_table = tb->n;
595 req.rtm.rtm_protocol = RTPROT_KERNEL;
596 req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
597 req.rtm.rtm_type = type;
598
599 rta.rta_dst = &dst;
600 rta.rta_prefsrc = &ifa->ifa_local;
601 rta.rta_oif = &ifa->ifa_dev->dev->ifindex;
602
603 if (cmd == RTM_NEWROUTE)
604 tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL);
605 else
606 tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL);
607 }
608
609 static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
610 {
611
612 fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
613
614 #if 0
615 if (!(dev->flags&IFF_UP))
616 return;
617 /* In the future, we will want to add default routes here */
618
619 #endif
620 }
621
622 static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
623 {
624 int found_it = 0;
625 struct net_device *dev;
626 struct dn_dev *dn_db;
627 struct dn_ifaddr *ifa2;
628
629 ASSERT_RTNL();
630
631 /* Scan device list */
632 read_lock(&dev_base_lock);
633 for(dev = dev_base; dev; dev = dev->next) {
634 dn_db = dev->dn_ptr;
635 if (dn_db == NULL)
636 continue;
637 for(ifa2 = dn_db->ifa_list; ifa2; ifa2 = ifa2->ifa_next) {
638 if (ifa2->ifa_local == ifa->ifa_local) {
639 found_it = 1;
640 break;
641 }
642 }
643 }
644 read_unlock(&dev_base_lock);
645
646 if (found_it == 0) {
647 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
648
649 if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
650 if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
651 dn_fib_flush();
652 }
653 }
654 }
655
656 static void dn_fib_disable_addr(struct net_device *dev, int force)
657 {
658 if (dn_fib_sync_down(0, dev, force))
659 dn_fib_flush();
660 dn_rt_cache_flush(0);
661 neigh_ifdown(&dn_neigh_table, dev);
662 }
663
664 static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
665 {
666 struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
667
668 switch(event) {
669 case NETDEV_UP:
670 dn_fib_add_ifaddr(ifa);
671 dn_fib_sync_up(ifa->ifa_dev->dev);
672 dn_rt_cache_flush(-1);
673 break;
674 case NETDEV_DOWN:
675 dn_fib_del_ifaddr(ifa);
676 if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
677 dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
678 } else {
679 dn_rt_cache_flush(-1);
680 }
681 break;
682 }
683 return NOTIFY_DONE;
684 }
685
686 int dn_fib_sync_down(dn_address local, struct net_device *dev, int force)
687 {
688 int ret = 0;
689 int scope = RT_SCOPE_NOWHERE;
690
691 if (force)
692 scope = -1;
693
694 for_fib_info() {
695 /*
696 * This makes no sense for DECnet.... we will almost
697 * certainly have more than one local address the same
698 * over all our interfaces. It needs thinking about
699 * some more.
700 */
701 if (local && fi->fib_prefsrc == local) {
702 fi->fib_flags |= RTNH_F_DEAD;
703 ret++;
704 } else if (dev && fi->fib_nhs) {
705 int dead = 0;
706
707 change_nexthops(fi) {
708 if (nh->nh_flags&RTNH_F_DEAD)
709 dead++;
710 else if (nh->nh_dev == dev &&
711 nh->nh_scope != scope) {
712 spin_lock_bh(&dn_fib_multipath_lock);
713 nh->nh_flags |= RTNH_F_DEAD;
714 fi->fib_power -= nh->nh_power;
715 nh->nh_power = 0;
716 spin_unlock_bh(&dn_fib_multipath_lock);
717 dead++;
718 }
719 } endfor_nexthops(fi)
720 if (dead == fi->fib_nhs) {
721 fi->fib_flags |= RTNH_F_DEAD;
722 ret++;
723 }
724 }
725 } endfor_fib_info();
726 return ret;
727 }
728
729
730 int dn_fib_sync_up(struct net_device *dev)
731 {
732 int ret = 0;
733
734 if (!(dev->flags&IFF_UP))
735 return 0;
736
737 for_fib_info() {
738 int alive = 0;
739
740 change_nexthops(fi) {
741 if (!(nh->nh_flags&RTNH_F_DEAD)) {
742 alive++;
743 continue;
744 }
745 if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
746 continue;
747 if (nh->nh_dev != dev || dev->dn_ptr == NULL)
748 continue;
749 alive++;
750 spin_lock_bh(&dn_fib_multipath_lock);
751 nh->nh_power = 0;
752 nh->nh_flags &= ~RTNH_F_DEAD;
753 spin_unlock_bh(&dn_fib_multipath_lock);
754 } endfor_nexthops(fi);
755
756 if (alive > 0) {
757 fi->fib_flags &= ~RTNH_F_DEAD;
758 ret++;
759 }
760 } endfor_fib_info();
761 return ret;
762 }
763
764 void dn_fib_flush(void)
765 {
766 int flushed = 0;
767 struct dn_fib_table *tb;
768 int id;
769
770 for(id = RT_TABLE_MAX; id > 0; id--) {
771 if ((tb = dn_fib_get_table(id, 0)) == NULL)
772 continue;
773 flushed += tb->flush(tb);
774 }
775
776 if (flushed)
777 dn_rt_cache_flush(-1);
778 }
779
780 static struct notifier_block dn_fib_dnaddr_notifier = {
781 .notifier_call = dn_fib_dnaddr_event,
782 };
783
784 void __exit dn_fib_cleanup(void)
785 {
786 dn_fib_table_cleanup();
787 dn_fib_rules_cleanup();
788
789 unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
790 }
791
792
793 void __init dn_fib_init(void)
794 {
795
796 dn_fib_table_init();
797 dn_fib_rules_init();
798
799 register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
800 }
801
802
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