tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 <linux/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
59static DEFINE_SPINLOCK(dn_fib_multipath_lock);
60static struct dn_fib_info *dn_fib_info_list;
61static DEFINE_SPINLOCK(dn_fib_info_lock);
62
63static 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
82static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force);
83static int dn_fib_sync_up(struct net_device *dev);
84
85void 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
100void 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
116static 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
132static 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
159static 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
175static 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
199static 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 flowidn fld;
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(&fld, 0, sizeof(fld));
225 fld.daddr = nh->nh_gw;
226 fld.flowidn_oif = nh->nh_oif;
227 fld.flowidn_scope = r->rtm_scope + 1;
228
229 if (fld.flowidn_scope < RT_SCOPE_LINK)
230 fld.flowidn_scope = RT_SCOPE_LINK;
231
232 if ((err = dn_fib_lookup(&fld, &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;
248out:
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
271struct 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 int flavour = attr->rta_type;
306
307 if (flavour) {
308 if (flavour > RTAX_MAX)
309 goto err_inval;
310 fi->fib_metrics[flavour-1] = *(unsigned int *)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(&init_net, 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
376link_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
395err_inval:
396 err = -EINVAL;
397
398failure:
399 *errp = err;
400 if (fi) {
401 fi->fib_dead = 1;
402 dn_fib_free_info(fi);
403 }
404
405 return NULL;
406}
407
408int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowidn *fld, 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 (!fld->flowidn_oif ||
429 fld->flowidn_oif == nh->nh_oif)
430 break;
431 }
432 if (nhsel < fi->fib_nhs) {
433 res->nh_sel = nhsel;
434 atomic_inc(&fi->fib_clntref);
435 return 0;
436 }
437 endfor_nexthops(fi);
438 res->fi = NULL;
439 return 1;
440 default:
441 net_err_ratelimited("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n",
442 type);
443 res->fi = NULL;
444 return -EINVAL;
445 }
446 }
447 return err;
448}
449
450void dn_fib_select_multipath(const struct flowidn *fld, struct dn_fib_res *res)
451{
452 struct dn_fib_info *fi = res->fi;
453 int w;
454
455 spin_lock_bh(&dn_fib_multipath_lock);
456 if (fi->fib_power <= 0) {
457 int power = 0;
458 change_nexthops(fi) {
459 if (!(nh->nh_flags&RTNH_F_DEAD)) {
460 power += nh->nh_weight;
461 nh->nh_power = nh->nh_weight;
462 }
463 } endfor_nexthops(fi);
464 fi->fib_power = power;
465 if (power < 0) {
466 spin_unlock_bh(&dn_fib_multipath_lock);
467 res->nh_sel = 0;
468 return;
469 }
470 }
471
472 w = jiffies % fi->fib_power;
473
474 change_nexthops(fi) {
475 if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
476 if ((w -= nh->nh_power) <= 0) {
477 nh->nh_power--;
478 fi->fib_power--;
479 res->nh_sel = nhsel;
480 spin_unlock_bh(&dn_fib_multipath_lock);
481 return;
482 }
483 }
484 } endfor_nexthops(fi);
485 res->nh_sel = 0;
486 spin_unlock_bh(&dn_fib_multipath_lock);
487}
488
489
490static int dn_fib_check_attr(struct rtmsg *r, struct rtattr **rta)
491{
492 int i;
493
494 for(i = 1; i <= RTA_MAX; i++) {
495 struct rtattr *attr = rta[i-1];
496 if (attr) {
497 if (RTA_PAYLOAD(attr) < 4 && RTA_PAYLOAD(attr) != 2)
498 return -EINVAL;
499 if (i != RTA_MULTIPATH && i != RTA_METRICS &&
500 i != RTA_TABLE)
501 rta[i-1] = (struct rtattr *)RTA_DATA(attr);
502 }
503 }
504
505 return 0;
506}
507
508static inline u32 rtm_get_table(struct rtattr **rta, u8 table)
509{
510 if (rta[RTA_TABLE - 1])
511 table = nla_get_u32((struct nlattr *) rta[RTA_TABLE - 1]);
512
513 return table;
514}
515
516static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
517{
518 struct net *net = sock_net(skb->sk);
519 struct dn_fib_table *tb;
520 struct rtattr **rta = arg;
521 struct rtmsg *r = NLMSG_DATA(nlh);
522
523 if (!capable(CAP_NET_ADMIN))
524 return -EPERM;
525
526 if (!net_eq(net, &init_net))
527 return -EINVAL;
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), 0);
533 if (tb)
534 return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
535
536 return -ESRCH;
537}
538
539static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
540{
541 struct net *net = sock_net(skb->sk);
542 struct dn_fib_table *tb;
543 struct rtattr **rta = arg;
544 struct rtmsg *r = NLMSG_DATA(nlh);
545
546 if (!capable(CAP_NET_ADMIN))
547 return -EPERM;
548
549 if (!net_eq(net, &init_net))
550 return -EINVAL;
551
552 if (dn_fib_check_attr(r, rta))
553 return -EINVAL;
554
555 tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 1);
556 if (tb)
557 return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
558
559 return -ENOBUFS;
560}
561
562static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
563{
564 struct dn_fib_table *tb;
565 struct {
566 struct nlmsghdr nlh;
567 struct rtmsg rtm;
568 } req;
569 struct dn_kern_rta rta;
570
571 memset(&req.rtm, 0, sizeof(req.rtm));
572 memset(&rta, 0, sizeof(rta));
573
574 if (type == RTN_UNICAST)
575 tb = dn_fib_get_table(RT_MIN_TABLE, 1);
576 else
577 tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
578
579 if (tb == NULL)
580 return;
581
582 req.nlh.nlmsg_len = sizeof(req);
583 req.nlh.nlmsg_type = cmd;
584 req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
585 req.nlh.nlmsg_pid = 0;
586 req.nlh.nlmsg_seq = 0;
587
588 req.rtm.rtm_dst_len = dst_len;
589 req.rtm.rtm_table = tb->n;
590 req.rtm.rtm_protocol = RTPROT_KERNEL;
591 req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
592 req.rtm.rtm_type = type;
593
594 rta.rta_dst = &dst;
595 rta.rta_prefsrc = &ifa->ifa_local;
596 rta.rta_oif = &ifa->ifa_dev->dev->ifindex;
597
598 if (cmd == RTM_NEWROUTE)
599 tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL);
600 else
601 tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL);
602}
603
604static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
605{
606
607 fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
608
609#if 0
610 if (!(dev->flags&IFF_UP))
611 return;
612 /* In the future, we will want to add default routes here */
613
614#endif
615}
616
617static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
618{
619 int found_it = 0;
620 struct net_device *dev;
621 struct dn_dev *dn_db;
622 struct dn_ifaddr *ifa2;
623
624 ASSERT_RTNL();
625
626 /* Scan device list */
627 rcu_read_lock();
628 for_each_netdev_rcu(&init_net, dev) {
629 dn_db = rcu_dereference(dev->dn_ptr);
630 if (dn_db == NULL)
631 continue;
632 for (ifa2 = rcu_dereference(dn_db->ifa_list);
633 ifa2 != NULL;
634 ifa2 = rcu_dereference(ifa2->ifa_next)) {
635 if (ifa2->ifa_local == ifa->ifa_local) {
636 found_it = 1;
637 break;
638 }
639 }
640 }
641 rcu_read_unlock();
642
643 if (found_it == 0) {
644 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
645
646 if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
647 if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
648 dn_fib_flush();
649 }
650 }
651}
652
653static void dn_fib_disable_addr(struct net_device *dev, int force)
654{
655 if (dn_fib_sync_down(0, dev, force))
656 dn_fib_flush();
657 dn_rt_cache_flush(0);
658 neigh_ifdown(&dn_neigh_table, dev);
659}
660
661static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
662{
663 struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
664
665 switch (event) {
666 case NETDEV_UP:
667 dn_fib_add_ifaddr(ifa);
668 dn_fib_sync_up(ifa->ifa_dev->dev);
669 dn_rt_cache_flush(-1);
670 break;
671 case NETDEV_DOWN:
672 dn_fib_del_ifaddr(ifa);
673 if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
674 dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
675 } else {
676 dn_rt_cache_flush(-1);
677 }
678 break;
679 }
680 return NOTIFY_DONE;
681}
682
683static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force)
684{
685 int ret = 0;
686 int scope = RT_SCOPE_NOWHERE;
687
688 if (force)
689 scope = -1;
690
691 for_fib_info() {
692 /*
693 * This makes no sense for DECnet.... we will almost
694 * certainly have more than one local address the same
695 * over all our interfaces. It needs thinking about
696 * some more.
697 */
698 if (local && fi->fib_prefsrc == local) {
699 fi->fib_flags |= RTNH_F_DEAD;
700 ret++;
701 } else if (dev && fi->fib_nhs) {
702 int dead = 0;
703
704 change_nexthops(fi) {
705 if (nh->nh_flags&RTNH_F_DEAD)
706 dead++;
707 else if (nh->nh_dev == dev &&
708 nh->nh_scope != scope) {
709 spin_lock_bh(&dn_fib_multipath_lock);
710 nh->nh_flags |= RTNH_F_DEAD;
711 fi->fib_power -= nh->nh_power;
712 nh->nh_power = 0;
713 spin_unlock_bh(&dn_fib_multipath_lock);
714 dead++;
715 }
716 } endfor_nexthops(fi)
717 if (dead == fi->fib_nhs) {
718 fi->fib_flags |= RTNH_F_DEAD;
719 ret++;
720 }
721 }
722 } endfor_fib_info();
723 return ret;
724}
725
726
727static int dn_fib_sync_up(struct net_device *dev)
728{
729 int ret = 0;
730
731 if (!(dev->flags&IFF_UP))
732 return 0;
733
734 for_fib_info() {
735 int alive = 0;
736
737 change_nexthops(fi) {
738 if (!(nh->nh_flags&RTNH_F_DEAD)) {
739 alive++;
740 continue;
741 }
742 if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
743 continue;
744 if (nh->nh_dev != dev || dev->dn_ptr == NULL)
745 continue;
746 alive++;
747 spin_lock_bh(&dn_fib_multipath_lock);
748 nh->nh_power = 0;
749 nh->nh_flags &= ~RTNH_F_DEAD;
750 spin_unlock_bh(&dn_fib_multipath_lock);
751 } endfor_nexthops(fi);
752
753 if (alive > 0) {
754 fi->fib_flags &= ~RTNH_F_DEAD;
755 ret++;
756 }
757 } endfor_fib_info();
758 return ret;
759}
760
761static struct notifier_block dn_fib_dnaddr_notifier = {
762 .notifier_call = dn_fib_dnaddr_event,
763};
764
765void __exit dn_fib_cleanup(void)
766{
767 dn_fib_table_cleanup();
768 dn_fib_rules_cleanup();
769
770 unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
771}
772
773
774void __init dn_fib_init(void)
775{
776 dn_fib_table_init();
777 dn_fib_rules_init();
778
779 register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
780
781 rtnl_register(PF_DECnet, RTM_NEWROUTE, dn_fib_rtm_newroute, NULL, NULL);
782 rtnl_register(PF_DECnet, RTM_DELROUTE, dn_fib_rtm_delroute, NULL, NULL);
783}
784
785