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
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
dn_fib_free_info(struct dn_fib_info * fi)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
dn_fib_release_info(struct dn_fib_info * fi)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
dn_fib_nh_comp(const struct dn_fib_info * fi,const struct dn_fib_info * ofi)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
dn_fib_find_info(const struct dn_fib_info * nfi)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
dn_fib_count_nhs(const struct nlattr * attr)148 static int dn_fib_count_nhs(const struct nlattr *attr)
149 {
150 struct rtnexthop *nhp = nla_data(attr);
151 int nhs = 0, nhlen = nla_len(attr);
152
153 while(nhlen >= (int)sizeof(struct rtnexthop)) {
154 if ((nhlen -= nhp->rtnh_len) < 0)
155 return 0;
156 nhs++;
157 nhp = RTNH_NEXT(nhp);
158 }
159
160 return nhs;
161 }
162
dn_fib_get_nhs(struct dn_fib_info * fi,const struct nlattr * attr,const struct rtmsg * r)163 static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct nlattr *attr,
164 const struct rtmsg *r)
165 {
166 struct rtnexthop *nhp = nla_data(attr);
167 int nhlen = nla_len(attr);
168
169 change_nexthops(fi) {
170 int attrlen = nhlen - sizeof(struct rtnexthop);
171 if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
172 return -EINVAL;
173
174 nh->nh_flags = (r->rtm_flags&~0xFF) | nhp->rtnh_flags;
175 nh->nh_oif = nhp->rtnh_ifindex;
176 nh->nh_weight = nhp->rtnh_hops + 1;
177
178 if (attrlen) {
179 struct nlattr *gw_attr;
180
181 gw_attr = nla_find((struct nlattr *) (nhp + 1), attrlen, RTA_GATEWAY);
182 nh->nh_gw = gw_attr ? nla_get_le16(gw_attr) : 0;
183 }
184 nhp = RTNH_NEXT(nhp);
185 } endfor_nexthops(fi);
186
187 return 0;
188 }
189
190
dn_fib_check_nh(const struct rtmsg * r,struct dn_fib_info * fi,struct dn_fib_nh * nh)191 static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh)
192 {
193 int err;
194
195 if (nh->nh_gw) {
196 struct flowidn fld;
197 struct dn_fib_res res;
198
199 if (nh->nh_flags&RTNH_F_ONLINK) {
200 struct net_device *dev;
201
202 if (r->rtm_scope >= RT_SCOPE_LINK)
203 return -EINVAL;
204 if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST)
205 return -EINVAL;
206 if ((dev = __dev_get_by_index(&init_net, nh->nh_oif)) == NULL)
207 return -ENODEV;
208 if (!(dev->flags&IFF_UP))
209 return -ENETDOWN;
210 nh->nh_dev = dev;
211 dev_hold(dev);
212 nh->nh_scope = RT_SCOPE_LINK;
213 return 0;
214 }
215
216 memset(&fld, 0, sizeof(fld));
217 fld.daddr = nh->nh_gw;
218 fld.flowidn_oif = nh->nh_oif;
219 fld.flowidn_scope = r->rtm_scope + 1;
220
221 if (fld.flowidn_scope < RT_SCOPE_LINK)
222 fld.flowidn_scope = RT_SCOPE_LINK;
223
224 if ((err = dn_fib_lookup(&fld, &res)) != 0)
225 return err;
226
227 err = -EINVAL;
228 if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
229 goto out;
230 nh->nh_scope = res.scope;
231 nh->nh_oif = DN_FIB_RES_OIF(res);
232 nh->nh_dev = DN_FIB_RES_DEV(res);
233 if (nh->nh_dev == NULL)
234 goto out;
235 dev_hold(nh->nh_dev);
236 err = -ENETDOWN;
237 if (!(nh->nh_dev->flags & IFF_UP))
238 goto out;
239 err = 0;
240 out:
241 dn_fib_res_put(&res);
242 return err;
243 } else {
244 struct net_device *dev;
245
246 if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK))
247 return -EINVAL;
248
249 dev = __dev_get_by_index(&init_net, nh->nh_oif);
250 if (dev == NULL || dev->dn_ptr == NULL)
251 return -ENODEV;
252 if (!(dev->flags&IFF_UP))
253 return -ENETDOWN;
254 nh->nh_dev = dev;
255 dev_hold(nh->nh_dev);
256 nh->nh_scope = RT_SCOPE_HOST;
257 }
258
259 return 0;
260 }
261
262
dn_fib_create_info(const struct rtmsg * r,struct nlattr * attrs[],const struct nlmsghdr * nlh,int * errp)263 struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct nlattr *attrs[],
264 const struct nlmsghdr *nlh, int *errp)
265 {
266 int err;
267 struct dn_fib_info *fi = NULL;
268 struct dn_fib_info *ofi;
269 int nhs = 1;
270
271 if (r->rtm_type > RTN_MAX)
272 goto err_inval;
273
274 if (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
275 goto err_inval;
276
277 if (attrs[RTA_MULTIPATH] &&
278 (nhs = dn_fib_count_nhs(attrs[RTA_MULTIPATH])) == 0)
279 goto err_inval;
280
281 fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
282 err = -ENOBUFS;
283 if (fi == NULL)
284 goto failure;
285
286 fi->fib_protocol = r->rtm_protocol;
287 fi->fib_nhs = nhs;
288 fi->fib_flags = r->rtm_flags;
289
290 if (attrs[RTA_PRIORITY])
291 fi->fib_priority = nla_get_u32(attrs[RTA_PRIORITY]);
292
293 if (attrs[RTA_METRICS]) {
294 struct nlattr *attr;
295 int rem;
296
297 nla_for_each_nested(attr, attrs[RTA_METRICS], rem) {
298 int type = nla_type(attr);
299
300 if (type) {
301 if (type > RTAX_MAX || nla_len(attr) < 4)
302 goto err_inval;
303
304 fi->fib_metrics[type-1] = nla_get_u32(attr);
305 }
306 }
307 }
308
309 if (attrs[RTA_PREFSRC])
310 fi->fib_prefsrc = nla_get_le16(attrs[RTA_PREFSRC]);
311
312 if (attrs[RTA_MULTIPATH]) {
313 if ((err = dn_fib_get_nhs(fi, attrs[RTA_MULTIPATH], r)) != 0)
314 goto failure;
315
316 if (attrs[RTA_OIF] &&
317 fi->fib_nh->nh_oif != nla_get_u32(attrs[RTA_OIF]))
318 goto err_inval;
319
320 if (attrs[RTA_GATEWAY] &&
321 fi->fib_nh->nh_gw != nla_get_le16(attrs[RTA_GATEWAY]))
322 goto err_inval;
323 } else {
324 struct dn_fib_nh *nh = fi->fib_nh;
325
326 if (attrs[RTA_OIF])
327 nh->nh_oif = nla_get_u32(attrs[RTA_OIF]);
328
329 if (attrs[RTA_GATEWAY])
330 nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]);
331
332 nh->nh_flags = r->rtm_flags;
333 nh->nh_weight = 1;
334 }
335
336 if (r->rtm_type == RTN_NAT) {
337 if (!attrs[RTA_GATEWAY] || nhs != 1 || attrs[RTA_OIF])
338 goto err_inval;
339
340 fi->fib_nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]);
341 goto link_it;
342 }
343
344 if (dn_fib_props[r->rtm_type].error) {
345 if (attrs[RTA_GATEWAY] || attrs[RTA_OIF] || attrs[RTA_MULTIPATH])
346 goto err_inval;
347
348 goto link_it;
349 }
350
351 if (r->rtm_scope > RT_SCOPE_HOST)
352 goto err_inval;
353
354 if (r->rtm_scope == RT_SCOPE_HOST) {
355 struct dn_fib_nh *nh = fi->fib_nh;
356
357 /* Local address is added */
358 if (nhs != 1 || nh->nh_gw)
359 goto err_inval;
360 nh->nh_scope = RT_SCOPE_NOWHERE;
361 nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif);
362 err = -ENODEV;
363 if (nh->nh_dev == NULL)
364 goto failure;
365 } else {
366 change_nexthops(fi) {
367 if ((err = dn_fib_check_nh(r, fi, nh)) != 0)
368 goto failure;
369 } endfor_nexthops(fi)
370 }
371
372 if (fi->fib_prefsrc) {
373 if (r->rtm_type != RTN_LOCAL || !attrs[RTA_DST] ||
374 fi->fib_prefsrc != nla_get_le16(attrs[RTA_DST]))
375 if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
376 goto err_inval;
377 }
378
379 link_it:
380 if ((ofi = dn_fib_find_info(fi)) != NULL) {
381 fi->fib_dead = 1;
382 dn_fib_free_info(fi);
383 ofi->fib_treeref++;
384 return ofi;
385 }
386
387 fi->fib_treeref++;
388 atomic_inc(&fi->fib_clntref);
389 spin_lock(&dn_fib_info_lock);
390 fi->fib_next = dn_fib_info_list;
391 fi->fib_prev = NULL;
392 if (dn_fib_info_list)
393 dn_fib_info_list->fib_prev = fi;
394 dn_fib_info_list = fi;
395 spin_unlock(&dn_fib_info_lock);
396 return fi;
397
398 err_inval:
399 err = -EINVAL;
400
401 failure:
402 *errp = err;
403 if (fi) {
404 fi->fib_dead = 1;
405 dn_fib_free_info(fi);
406 }
407
408 return NULL;
409 }
410
dn_fib_semantic_match(int type,struct dn_fib_info * fi,const struct flowidn * fld,struct dn_fib_res * res)411 int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowidn *fld, struct dn_fib_res *res)
412 {
413 int err = dn_fib_props[type].error;
414
415 if (err == 0) {
416 if (fi->fib_flags & RTNH_F_DEAD)
417 return 1;
418
419 res->fi = fi;
420
421 switch (type) {
422 case RTN_NAT:
423 DN_FIB_RES_RESET(*res);
424 atomic_inc(&fi->fib_clntref);
425 return 0;
426 case RTN_UNICAST:
427 case RTN_LOCAL:
428 for_nexthops(fi) {
429 if (nh->nh_flags & RTNH_F_DEAD)
430 continue;
431 if (!fld->flowidn_oif ||
432 fld->flowidn_oif == nh->nh_oif)
433 break;
434 }
435 if (nhsel < fi->fib_nhs) {
436 res->nh_sel = nhsel;
437 atomic_inc(&fi->fib_clntref);
438 return 0;
439 }
440 endfor_nexthops(fi);
441 res->fi = NULL;
442 return 1;
443 default:
444 net_err_ratelimited("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n",
445 type);
446 res->fi = NULL;
447 return -EINVAL;
448 }
449 }
450 return err;
451 }
452
dn_fib_select_multipath(const struct flowidn * fld,struct dn_fib_res * res)453 void dn_fib_select_multipath(const struct flowidn *fld, struct dn_fib_res *res)
454 {
455 struct dn_fib_info *fi = res->fi;
456 int w;
457
458 spin_lock_bh(&dn_fib_multipath_lock);
459 if (fi->fib_power <= 0) {
460 int power = 0;
461 change_nexthops(fi) {
462 if (!(nh->nh_flags&RTNH_F_DEAD)) {
463 power += nh->nh_weight;
464 nh->nh_power = nh->nh_weight;
465 }
466 } endfor_nexthops(fi);
467 fi->fib_power = power;
468 if (power < 0) {
469 spin_unlock_bh(&dn_fib_multipath_lock);
470 res->nh_sel = 0;
471 return;
472 }
473 }
474
475 w = jiffies % fi->fib_power;
476
477 change_nexthops(fi) {
478 if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
479 if ((w -= nh->nh_power) <= 0) {
480 nh->nh_power--;
481 fi->fib_power--;
482 res->nh_sel = nhsel;
483 spin_unlock_bh(&dn_fib_multipath_lock);
484 return;
485 }
486 }
487 } endfor_nexthops(fi);
488 res->nh_sel = 0;
489 spin_unlock_bh(&dn_fib_multipath_lock);
490 }
491
rtm_get_table(struct nlattr * attrs[],u8 table)492 static inline u32 rtm_get_table(struct nlattr *attrs[], u8 table)
493 {
494 if (attrs[RTA_TABLE])
495 table = nla_get_u32(attrs[RTA_TABLE]);
496
497 return table;
498 }
499
dn_fib_rtm_delroute(struct sk_buff * skb,struct nlmsghdr * nlh)500 static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
501 {
502 struct net *net = sock_net(skb->sk);
503 struct dn_fib_table *tb;
504 struct rtmsg *r = nlmsg_data(nlh);
505 struct nlattr *attrs[RTA_MAX+1];
506 int err;
507
508 if (!netlink_capable(skb, CAP_NET_ADMIN))
509 return -EPERM;
510
511 if (!net_eq(net, &init_net))
512 return -EINVAL;
513
514 err = nlmsg_parse(nlh, sizeof(*r), attrs, RTA_MAX, rtm_dn_policy);
515 if (err < 0)
516 return err;
517
518 tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 0);
519 if (!tb)
520 return -ESRCH;
521
522 return tb->delete(tb, r, attrs, nlh, &NETLINK_CB(skb));
523 }
524
dn_fib_rtm_newroute(struct sk_buff * skb,struct nlmsghdr * nlh)525 static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
526 {
527 struct net *net = sock_net(skb->sk);
528 struct dn_fib_table *tb;
529 struct rtmsg *r = nlmsg_data(nlh);
530 struct nlattr *attrs[RTA_MAX+1];
531 int err;
532
533 if (!netlink_capable(skb, CAP_NET_ADMIN))
534 return -EPERM;
535
536 if (!net_eq(net, &init_net))
537 return -EINVAL;
538
539 err = nlmsg_parse(nlh, sizeof(*r), attrs, RTA_MAX, rtm_dn_policy);
540 if (err < 0)
541 return err;
542
543 tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 1);
544 if (!tb)
545 return -ENOBUFS;
546
547 return tb->insert(tb, r, attrs, nlh, &NETLINK_CB(skb));
548 }
549
fib_magic(int cmd,int type,__le16 dst,int dst_len,struct dn_ifaddr * ifa)550 static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
551 {
552 struct dn_fib_table *tb;
553 struct {
554 struct nlmsghdr nlh;
555 struct rtmsg rtm;
556 } req;
557 struct {
558 struct nlattr hdr;
559 __le16 dst;
560 } dst_attr = {
561 .dst = dst,
562 };
563 struct {
564 struct nlattr hdr;
565 __le16 prefsrc;
566 } prefsrc_attr = {
567 .prefsrc = ifa->ifa_local,
568 };
569 struct {
570 struct nlattr hdr;
571 u32 oif;
572 } oif_attr = {
573 .oif = ifa->ifa_dev->dev->ifindex,
574 };
575 struct nlattr *attrs[RTA_MAX+1] = {
576 [RTA_DST] = (struct nlattr *) &dst_attr,
577 [RTA_PREFSRC] = (struct nlattr * ) &prefsrc_attr,
578 [RTA_OIF] = (struct nlattr *) &oif_attr,
579 };
580
581 memset(&req.rtm, 0, sizeof(req.rtm));
582
583 if (type == RTN_UNICAST)
584 tb = dn_fib_get_table(RT_MIN_TABLE, 1);
585 else
586 tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
587
588 if (tb == NULL)
589 return;
590
591 req.nlh.nlmsg_len = sizeof(req);
592 req.nlh.nlmsg_type = cmd;
593 req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
594 req.nlh.nlmsg_pid = 0;
595 req.nlh.nlmsg_seq = 0;
596
597 req.rtm.rtm_dst_len = dst_len;
598 req.rtm.rtm_table = tb->n;
599 req.rtm.rtm_protocol = RTPROT_KERNEL;
600 req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
601 req.rtm.rtm_type = type;
602
603 if (cmd == RTM_NEWROUTE)
604 tb->insert(tb, &req.rtm, attrs, &req.nlh, NULL);
605 else
606 tb->delete(tb, &req.rtm, attrs, &req.nlh, NULL);
607 }
608
dn_fib_add_ifaddr(struct dn_ifaddr * ifa)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
dn_fib_del_ifaddr(struct dn_ifaddr * ifa)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 rcu_read_lock();
633 for_each_netdev_rcu(&init_net, dev) {
634 dn_db = rcu_dereference(dev->dn_ptr);
635 if (dn_db == NULL)
636 continue;
637 for (ifa2 = rcu_dereference(dn_db->ifa_list);
638 ifa2 != NULL;
639 ifa2 = rcu_dereference(ifa2->ifa_next)) {
640 if (ifa2->ifa_local == ifa->ifa_local) {
641 found_it = 1;
642 break;
643 }
644 }
645 }
646 rcu_read_unlock();
647
648 if (found_it == 0) {
649 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
650
651 if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
652 if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
653 dn_fib_flush();
654 }
655 }
656 }
657
dn_fib_disable_addr(struct net_device * dev,int force)658 static void dn_fib_disable_addr(struct net_device *dev, int force)
659 {
660 if (dn_fib_sync_down(0, dev, force))
661 dn_fib_flush();
662 dn_rt_cache_flush(0);
663 neigh_ifdown(&dn_neigh_table, dev);
664 }
665
dn_fib_dnaddr_event(struct notifier_block * this,unsigned long event,void * ptr)666 static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
667 {
668 struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
669
670 switch (event) {
671 case NETDEV_UP:
672 dn_fib_add_ifaddr(ifa);
673 dn_fib_sync_up(ifa->ifa_dev->dev);
674 dn_rt_cache_flush(-1);
675 break;
676 case NETDEV_DOWN:
677 dn_fib_del_ifaddr(ifa);
678 if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
679 dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
680 } else {
681 dn_rt_cache_flush(-1);
682 }
683 break;
684 }
685 return NOTIFY_DONE;
686 }
687
dn_fib_sync_down(__le16 local,struct net_device * dev,int force)688 static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force)
689 {
690 int ret = 0;
691 int scope = RT_SCOPE_NOWHERE;
692
693 if (force)
694 scope = -1;
695
696 for_fib_info() {
697 /*
698 * This makes no sense for DECnet.... we will almost
699 * certainly have more than one local address the same
700 * over all our interfaces. It needs thinking about
701 * some more.
702 */
703 if (local && fi->fib_prefsrc == local) {
704 fi->fib_flags |= RTNH_F_DEAD;
705 ret++;
706 } else if (dev && fi->fib_nhs) {
707 int dead = 0;
708
709 change_nexthops(fi) {
710 if (nh->nh_flags&RTNH_F_DEAD)
711 dead++;
712 else if (nh->nh_dev == dev &&
713 nh->nh_scope != scope) {
714 spin_lock_bh(&dn_fib_multipath_lock);
715 nh->nh_flags |= RTNH_F_DEAD;
716 fi->fib_power -= nh->nh_power;
717 nh->nh_power = 0;
718 spin_unlock_bh(&dn_fib_multipath_lock);
719 dead++;
720 }
721 } endfor_nexthops(fi)
722 if (dead == fi->fib_nhs) {
723 fi->fib_flags |= RTNH_F_DEAD;
724 ret++;
725 }
726 }
727 } endfor_fib_info();
728 return ret;
729 }
730
731
dn_fib_sync_up(struct net_device * dev)732 static int dn_fib_sync_up(struct net_device *dev)
733 {
734 int ret = 0;
735
736 if (!(dev->flags&IFF_UP))
737 return 0;
738
739 for_fib_info() {
740 int alive = 0;
741
742 change_nexthops(fi) {
743 if (!(nh->nh_flags&RTNH_F_DEAD)) {
744 alive++;
745 continue;
746 }
747 if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
748 continue;
749 if (nh->nh_dev != dev || dev->dn_ptr == NULL)
750 continue;
751 alive++;
752 spin_lock_bh(&dn_fib_multipath_lock);
753 nh->nh_power = 0;
754 nh->nh_flags &= ~RTNH_F_DEAD;
755 spin_unlock_bh(&dn_fib_multipath_lock);
756 } endfor_nexthops(fi);
757
758 if (alive > 0) {
759 fi->fib_flags &= ~RTNH_F_DEAD;
760 ret++;
761 }
762 } endfor_fib_info();
763 return ret;
764 }
765
766 static struct notifier_block dn_fib_dnaddr_notifier = {
767 .notifier_call = dn_fib_dnaddr_event,
768 };
769
dn_fib_cleanup(void)770 void __exit dn_fib_cleanup(void)
771 {
772 dn_fib_table_cleanup();
773 dn_fib_rules_cleanup();
774
775 unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
776 }
777
778
dn_fib_init(void)779 void __init dn_fib_init(void)
780 {
781 dn_fib_table_init();
782 dn_fib_rules_init();
783
784 register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
785
786 rtnl_register(PF_DECnet, RTM_NEWROUTE, dn_fib_rtm_newroute, NULL, NULL);
787 rtnl_register(PF_DECnet, RTM_DELROUTE, dn_fib_rtm_delroute, NULL, NULL);
788 }
789
790
791