1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * DECnet An implementation of the DECnet protocol suite for the LINUX
4 * operating system. DECnet is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * DECnet Routing Forwarding Information Base (Glue/Info List)
8 *
9 * Author: Steve Whitehouse <SteveW@ACM.org>
10 *
11 *
12 * Changes:
13 * Alexey Kuznetsov : SMP locking changes
14 * Steve Whitehouse : Rewrote it... Well to be more correct, I
15 * copied most of it from the ipv4 fib code.
16 * Steve Whitehouse : Updated it in style and fixed a few bugs
17 * which were fixed in the ipv4 code since
18 * this code was copied from it.
19 *
20 */
21 #include <linux/string.h>
22 #include <linux/net.h>
23 #include <linux/socket.h>
24 #include <linux/slab.h>
25 #include <linux/sockios.h>
26 #include <linux/init.h>
27 #include <linux/skbuff.h>
28 #include <linux/netlink.h>
29 #include <linux/rtnetlink.h>
30 #include <linux/proc_fs.h>
31 #include <linux/netdevice.h>
32 #include <linux/timer.h>
33 #include <linux/spinlock.h>
34 #include <linux/atomic.h>
35 #include <linux/uaccess.h>
36 #include <net/neighbour.h>
37 #include <net/dst.h>
38 #include <net/flow.h>
39 #include <net/fib_rules.h>
40 #include <net/dn.h>
41 #include <net/dn_route.h>
42 #include <net/dn_fib.h>
43 #include <net/dn_neigh.h>
44 #include <net/dn_dev.h>
45 #include <net/rtnh.h>
46
47 #define RT_MIN_TABLE 1
48
49 #define for_fib_info() { struct dn_fib_info *fi;\
50 for(fi = dn_fib_info_list; fi; fi = fi->fib_next)
51 #define endfor_fib_info() }
52
53 #define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
54 for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
55
56 #define change_nexthops(fi) { int nhsel; struct dn_fib_nh *nh;\
57 for(nhsel = 0, nh = (struct dn_fib_nh *)((fi)->fib_nh); nhsel < (fi)->fib_nhs; nh++, nhsel++)
58
59 #define endfor_nexthops(fi) }
60
61 static DEFINE_SPINLOCK(dn_fib_multipath_lock);
62 static struct dn_fib_info *dn_fib_info_list;
63 static DEFINE_SPINLOCK(dn_fib_info_lock);
64
65 static struct
66 {
67 int error;
68 u8 scope;
69 } dn_fib_props[RTN_MAX+1] = {
70 [RTN_UNSPEC] = { .error = 0, .scope = RT_SCOPE_NOWHERE },
71 [RTN_UNICAST] = { .error = 0, .scope = RT_SCOPE_UNIVERSE },
72 [RTN_LOCAL] = { .error = 0, .scope = RT_SCOPE_HOST },
73 [RTN_BROADCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
74 [RTN_ANYCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
75 [RTN_MULTICAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
76 [RTN_BLACKHOLE] = { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE },
77 [RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE },
78 [RTN_PROHIBIT] = { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE },
79 [RTN_THROW] = { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE },
80 [RTN_NAT] = { .error = 0, .scope = RT_SCOPE_NOWHERE },
81 [RTN_XRESOLVE] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
82 };
83
84 static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force);
85 static int dn_fib_sync_up(struct net_device *dev);
86
dn_fib_free_info(struct dn_fib_info * fi)87 void dn_fib_free_info(struct dn_fib_info *fi)
88 {
89 if (fi->fib_dead == 0) {
90 printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n");
91 return;
92 }
93
94 change_nexthops(fi) {
95 if (nh->nh_dev)
96 dev_put(nh->nh_dev);
97 nh->nh_dev = NULL;
98 } endfor_nexthops(fi);
99 kfree(fi);
100 }
101
dn_fib_release_info(struct dn_fib_info * fi)102 void dn_fib_release_info(struct dn_fib_info *fi)
103 {
104 spin_lock(&dn_fib_info_lock);
105 if (fi && --fi->fib_treeref == 0) {
106 if (fi->fib_next)
107 fi->fib_next->fib_prev = fi->fib_prev;
108 if (fi->fib_prev)
109 fi->fib_prev->fib_next = fi->fib_next;
110 if (fi == dn_fib_info_list)
111 dn_fib_info_list = fi->fib_next;
112 fi->fib_dead = 1;
113 dn_fib_info_put(fi);
114 }
115 spin_unlock(&dn_fib_info_lock);
116 }
117
dn_fib_nh_comp(const struct dn_fib_info * fi,const struct dn_fib_info * ofi)118 static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi)
119 {
120 const struct dn_fib_nh *onh = ofi->fib_nh;
121
122 for_nexthops(fi) {
123 if (nh->nh_oif != onh->nh_oif ||
124 nh->nh_gw != onh->nh_gw ||
125 nh->nh_scope != onh->nh_scope ||
126 nh->nh_weight != onh->nh_weight ||
127 ((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD))
128 return -1;
129 onh++;
130 } endfor_nexthops(fi);
131 return 0;
132 }
133
dn_fib_find_info(const struct dn_fib_info * nfi)134 static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi)
135 {
136 for_fib_info() {
137 if (fi->fib_nhs != nfi->fib_nhs)
138 continue;
139 if (nfi->fib_protocol == fi->fib_protocol &&
140 nfi->fib_prefsrc == fi->fib_prefsrc &&
141 nfi->fib_priority == fi->fib_priority &&
142 memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 &&
143 ((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 &&
144 (nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0))
145 return fi;
146 } endfor_fib_info();
147 return NULL;
148 }
149
dn_fib_count_nhs(const struct nlattr * attr)150 static int dn_fib_count_nhs(const struct nlattr *attr)
151 {
152 struct rtnexthop *nhp = nla_data(attr);
153 int nhs = 0, nhlen = nla_len(attr);
154
155 while (rtnh_ok(nhp, nhlen)) {
156 nhs++;
157 nhp = rtnh_next(nhp, &nhlen);
158 }
159
160 /* leftover implies invalid nexthop configuration, discard it */
161 return nhlen > 0 ? 0 : nhs;
162 }
163
dn_fib_get_nhs(struct dn_fib_info * fi,const struct nlattr * attr,const struct rtmsg * r)164 static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct nlattr *attr,
165 const struct rtmsg *r)
166 {
167 struct rtnexthop *nhp = nla_data(attr);
168 int nhlen = nla_len(attr);
169
170 change_nexthops(fi) {
171 int attrlen;
172
173 if (!rtnh_ok(nhp, nhlen))
174 return -EINVAL;
175
176 nh->nh_flags = (r->rtm_flags&~0xFF) | nhp->rtnh_flags;
177 nh->nh_oif = nhp->rtnh_ifindex;
178 nh->nh_weight = nhp->rtnh_hops + 1;
179
180 attrlen = rtnh_attrlen(nhp);
181 if (attrlen > 0) {
182 struct nlattr *gw_attr;
183
184 gw_attr = nla_find((struct nlattr *) (nhp + 1), attrlen, RTA_GATEWAY);
185 nh->nh_gw = gw_attr ? nla_get_le16(gw_attr) : 0;
186 }
187
188 nhp = rtnh_next(nhp, &nhlen);
189 } endfor_nexthops(fi);
190
191 return 0;
192 }
193
194
dn_fib_check_nh(const struct rtmsg * r,struct dn_fib_info * fi,struct dn_fib_nh * nh)195 static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh)
196 {
197 int err;
198
199 if (nh->nh_gw) {
200 struct flowidn fld;
201 struct dn_fib_res res;
202
203 if (nh->nh_flags&RTNH_F_ONLINK) {
204 struct net_device *dev;
205
206 if (r->rtm_scope >= RT_SCOPE_LINK)
207 return -EINVAL;
208 if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST)
209 return -EINVAL;
210 if ((dev = __dev_get_by_index(&init_net, nh->nh_oif)) == NULL)
211 return -ENODEV;
212 if (!(dev->flags&IFF_UP))
213 return -ENETDOWN;
214 nh->nh_dev = dev;
215 dev_hold(dev);
216 nh->nh_scope = RT_SCOPE_LINK;
217 return 0;
218 }
219
220 memset(&fld, 0, sizeof(fld));
221 fld.daddr = nh->nh_gw;
222 fld.flowidn_oif = nh->nh_oif;
223 fld.flowidn_scope = r->rtm_scope + 1;
224
225 if (fld.flowidn_scope < RT_SCOPE_LINK)
226 fld.flowidn_scope = RT_SCOPE_LINK;
227
228 if ((err = dn_fib_lookup(&fld, &res)) != 0)
229 return err;
230
231 err = -EINVAL;
232 if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
233 goto out;
234 nh->nh_scope = res.scope;
235 nh->nh_oif = DN_FIB_RES_OIF(res);
236 nh->nh_dev = DN_FIB_RES_DEV(res);
237 if (nh->nh_dev == NULL)
238 goto out;
239 dev_hold(nh->nh_dev);
240 err = -ENETDOWN;
241 if (!(nh->nh_dev->flags & IFF_UP))
242 goto out;
243 err = 0;
244 out:
245 dn_fib_res_put(&res);
246 return err;
247 } else {
248 struct net_device *dev;
249
250 if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK))
251 return -EINVAL;
252
253 dev = __dev_get_by_index(&init_net, nh->nh_oif);
254 if (dev == NULL || dev->dn_ptr == NULL)
255 return -ENODEV;
256 if (!(dev->flags&IFF_UP))
257 return -ENETDOWN;
258 nh->nh_dev = dev;
259 dev_hold(nh->nh_dev);
260 nh->nh_scope = RT_SCOPE_HOST;
261 }
262
263 return 0;
264 }
265
266
dn_fib_create_info(const struct rtmsg * r,struct nlattr * attrs[],const struct nlmsghdr * nlh,int * errp)267 struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct nlattr *attrs[],
268 const struct nlmsghdr *nlh, int *errp)
269 {
270 int err;
271 struct dn_fib_info *fi = NULL;
272 struct dn_fib_info *ofi;
273 int nhs = 1;
274
275 if (r->rtm_type > RTN_MAX)
276 goto err_inval;
277
278 if (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
279 goto err_inval;
280
281 if (attrs[RTA_MULTIPATH] &&
282 (nhs = dn_fib_count_nhs(attrs[RTA_MULTIPATH])) == 0)
283 goto err_inval;
284
285 fi = kzalloc(struct_size(fi, fib_nh, nhs), GFP_KERNEL);
286 err = -ENOBUFS;
287 if (fi == NULL)
288 goto failure;
289
290 fi->fib_protocol = r->rtm_protocol;
291 fi->fib_nhs = nhs;
292 fi->fib_flags = r->rtm_flags;
293
294 if (attrs[RTA_PRIORITY])
295 fi->fib_priority = nla_get_u32(attrs[RTA_PRIORITY]);
296
297 if (attrs[RTA_METRICS]) {
298 struct nlattr *attr;
299 int rem;
300
301 nla_for_each_nested(attr, attrs[RTA_METRICS], rem) {
302 int type = nla_type(attr);
303
304 if (type) {
305 if (type > RTAX_MAX || type == RTAX_CC_ALGO ||
306 nla_len(attr) < 4)
307 goto err_inval;
308
309 fi->fib_metrics[type-1] = nla_get_u32(attr);
310 }
311 }
312 }
313
314 if (attrs[RTA_PREFSRC])
315 fi->fib_prefsrc = nla_get_le16(attrs[RTA_PREFSRC]);
316
317 if (attrs[RTA_MULTIPATH]) {
318 if ((err = dn_fib_get_nhs(fi, attrs[RTA_MULTIPATH], r)) != 0)
319 goto failure;
320
321 if (attrs[RTA_OIF] &&
322 fi->fib_nh->nh_oif != nla_get_u32(attrs[RTA_OIF]))
323 goto err_inval;
324
325 if (attrs[RTA_GATEWAY] &&
326 fi->fib_nh->nh_gw != nla_get_le16(attrs[RTA_GATEWAY]))
327 goto err_inval;
328 } else {
329 struct dn_fib_nh *nh = fi->fib_nh;
330
331 if (attrs[RTA_OIF])
332 nh->nh_oif = nla_get_u32(attrs[RTA_OIF]);
333
334 if (attrs[RTA_GATEWAY])
335 nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]);
336
337 nh->nh_flags = r->rtm_flags;
338 nh->nh_weight = 1;
339 }
340
341 if (r->rtm_type == RTN_NAT) {
342 if (!attrs[RTA_GATEWAY] || nhs != 1 || attrs[RTA_OIF])
343 goto err_inval;
344
345 fi->fib_nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]);
346 goto link_it;
347 }
348
349 if (dn_fib_props[r->rtm_type].error) {
350 if (attrs[RTA_GATEWAY] || attrs[RTA_OIF] || attrs[RTA_MULTIPATH])
351 goto err_inval;
352
353 goto link_it;
354 }
355
356 if (r->rtm_scope > RT_SCOPE_HOST)
357 goto err_inval;
358
359 if (r->rtm_scope == RT_SCOPE_HOST) {
360 struct dn_fib_nh *nh = fi->fib_nh;
361
362 /* Local address is added */
363 if (nhs != 1 || nh->nh_gw)
364 goto err_inval;
365 nh->nh_scope = RT_SCOPE_NOWHERE;
366 nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif);
367 err = -ENODEV;
368 if (nh->nh_dev == NULL)
369 goto failure;
370 } else {
371 change_nexthops(fi) {
372 if ((err = dn_fib_check_nh(r, fi, nh)) != 0)
373 goto failure;
374 } endfor_nexthops(fi)
375 }
376
377 if (fi->fib_prefsrc) {
378 if (r->rtm_type != RTN_LOCAL || !attrs[RTA_DST] ||
379 fi->fib_prefsrc != nla_get_le16(attrs[RTA_DST]))
380 if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
381 goto err_inval;
382 }
383
384 link_it:
385 if ((ofi = dn_fib_find_info(fi)) != NULL) {
386 fi->fib_dead = 1;
387 dn_fib_free_info(fi);
388 ofi->fib_treeref++;
389 return ofi;
390 }
391
392 fi->fib_treeref++;
393 refcount_set(&fi->fib_clntref, 1);
394 spin_lock(&dn_fib_info_lock);
395 fi->fib_next = dn_fib_info_list;
396 fi->fib_prev = NULL;
397 if (dn_fib_info_list)
398 dn_fib_info_list->fib_prev = fi;
399 dn_fib_info_list = fi;
400 spin_unlock(&dn_fib_info_lock);
401 return fi;
402
403 err_inval:
404 err = -EINVAL;
405
406 failure:
407 *errp = err;
408 if (fi) {
409 fi->fib_dead = 1;
410 dn_fib_free_info(fi);
411 }
412
413 return NULL;
414 }
415
dn_fib_semantic_match(int type,struct dn_fib_info * fi,const struct flowidn * fld,struct dn_fib_res * res)416 int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowidn *fld, struct dn_fib_res *res)
417 {
418 int err = dn_fib_props[type].error;
419
420 if (err == 0) {
421 if (fi->fib_flags & RTNH_F_DEAD)
422 return 1;
423
424 res->fi = fi;
425
426 switch (type) {
427 case RTN_NAT:
428 DN_FIB_RES_RESET(*res);
429 refcount_inc(&fi->fib_clntref);
430 return 0;
431 case RTN_UNICAST:
432 case RTN_LOCAL:
433 for_nexthops(fi) {
434 if (nh->nh_flags & RTNH_F_DEAD)
435 continue;
436 if (!fld->flowidn_oif ||
437 fld->flowidn_oif == nh->nh_oif)
438 break;
439 }
440 if (nhsel < fi->fib_nhs) {
441 res->nh_sel = nhsel;
442 refcount_inc(&fi->fib_clntref);
443 return 0;
444 }
445 endfor_nexthops(fi);
446 res->fi = NULL;
447 return 1;
448 default:
449 net_err_ratelimited("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n",
450 type);
451 res->fi = NULL;
452 return -EINVAL;
453 }
454 }
455 return err;
456 }
457
dn_fib_select_multipath(const struct flowidn * fld,struct dn_fib_res * res)458 void dn_fib_select_multipath(const struct flowidn *fld, struct dn_fib_res *res)
459 {
460 struct dn_fib_info *fi = res->fi;
461 int w;
462
463 spin_lock_bh(&dn_fib_multipath_lock);
464 if (fi->fib_power <= 0) {
465 int power = 0;
466 change_nexthops(fi) {
467 if (!(nh->nh_flags&RTNH_F_DEAD)) {
468 power += nh->nh_weight;
469 nh->nh_power = nh->nh_weight;
470 }
471 } endfor_nexthops(fi);
472 fi->fib_power = power;
473 if (power < 0) {
474 spin_unlock_bh(&dn_fib_multipath_lock);
475 res->nh_sel = 0;
476 return;
477 }
478 }
479
480 w = jiffies % fi->fib_power;
481
482 change_nexthops(fi) {
483 if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
484 if ((w -= nh->nh_power) <= 0) {
485 nh->nh_power--;
486 fi->fib_power--;
487 res->nh_sel = nhsel;
488 spin_unlock_bh(&dn_fib_multipath_lock);
489 return;
490 }
491 }
492 } endfor_nexthops(fi);
493 res->nh_sel = 0;
494 spin_unlock_bh(&dn_fib_multipath_lock);
495 }
496
rtm_get_table(struct nlattr * attrs[],u8 table)497 static inline u32 rtm_get_table(struct nlattr *attrs[], u8 table)
498 {
499 if (attrs[RTA_TABLE])
500 table = nla_get_u32(attrs[RTA_TABLE]);
501
502 return table;
503 }
504
dn_fib_rtm_delroute(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)505 static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
506 struct netlink_ext_ack *extack)
507 {
508 struct net *net = sock_net(skb->sk);
509 struct dn_fib_table *tb;
510 struct rtmsg *r = nlmsg_data(nlh);
511 struct nlattr *attrs[RTA_MAX+1];
512 int err;
513
514 if (!netlink_capable(skb, CAP_NET_ADMIN))
515 return -EPERM;
516
517 if (!net_eq(net, &init_net))
518 return -EINVAL;
519
520 err = nlmsg_parse_deprecated(nlh, sizeof(*r), attrs, RTA_MAX,
521 rtm_dn_policy, extack);
522 if (err < 0)
523 return err;
524
525 tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 0);
526 if (!tb)
527 return -ESRCH;
528
529 return tb->delete(tb, r, attrs, nlh, &NETLINK_CB(skb));
530 }
531
dn_fib_rtm_newroute(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)532 static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
533 struct netlink_ext_ack *extack)
534 {
535 struct net *net = sock_net(skb->sk);
536 struct dn_fib_table *tb;
537 struct rtmsg *r = nlmsg_data(nlh);
538 struct nlattr *attrs[RTA_MAX+1];
539 int err;
540
541 if (!netlink_capable(skb, CAP_NET_ADMIN))
542 return -EPERM;
543
544 if (!net_eq(net, &init_net))
545 return -EINVAL;
546
547 err = nlmsg_parse_deprecated(nlh, sizeof(*r), attrs, RTA_MAX,
548 rtm_dn_policy, extack);
549 if (err < 0)
550 return err;
551
552 tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 1);
553 if (!tb)
554 return -ENOBUFS;
555
556 return tb->insert(tb, r, attrs, nlh, &NETLINK_CB(skb));
557 }
558
fib_magic(int cmd,int type,__le16 dst,int dst_len,struct dn_ifaddr * ifa)559 static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
560 {
561 struct dn_fib_table *tb;
562 struct {
563 struct nlmsghdr nlh;
564 struct rtmsg rtm;
565 } req;
566 struct {
567 struct nlattr hdr;
568 __le16 dst;
569 } dst_attr = {
570 .dst = dst,
571 };
572 struct {
573 struct nlattr hdr;
574 __le16 prefsrc;
575 } prefsrc_attr = {
576 .prefsrc = ifa->ifa_local,
577 };
578 struct {
579 struct nlattr hdr;
580 u32 oif;
581 } oif_attr = {
582 .oif = ifa->ifa_dev->dev->ifindex,
583 };
584 struct nlattr *attrs[RTA_MAX+1] = {
585 [RTA_DST] = (struct nlattr *) &dst_attr,
586 [RTA_PREFSRC] = (struct nlattr * ) &prefsrc_attr,
587 [RTA_OIF] = (struct nlattr *) &oif_attr,
588 };
589
590 memset(&req.rtm, 0, sizeof(req.rtm));
591
592 if (type == RTN_UNICAST)
593 tb = dn_fib_get_table(RT_MIN_TABLE, 1);
594 else
595 tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
596
597 if (tb == NULL)
598 return;
599
600 req.nlh.nlmsg_len = sizeof(req);
601 req.nlh.nlmsg_type = cmd;
602 req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
603 req.nlh.nlmsg_pid = 0;
604 req.nlh.nlmsg_seq = 0;
605
606 req.rtm.rtm_dst_len = dst_len;
607 req.rtm.rtm_table = tb->n;
608 req.rtm.rtm_protocol = RTPROT_KERNEL;
609 req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
610 req.rtm.rtm_type = type;
611
612 if (cmd == RTM_NEWROUTE)
613 tb->insert(tb, &req.rtm, attrs, &req.nlh, NULL);
614 else
615 tb->delete(tb, &req.rtm, attrs, &req.nlh, NULL);
616 }
617
dn_fib_add_ifaddr(struct dn_ifaddr * ifa)618 static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
619 {
620
621 fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
622
623 #if 0
624 if (!(dev->flags&IFF_UP))
625 return;
626 /* In the future, we will want to add default routes here */
627
628 #endif
629 }
630
dn_fib_del_ifaddr(struct dn_ifaddr * ifa)631 static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
632 {
633 int found_it = 0;
634 struct net_device *dev;
635 struct dn_dev *dn_db;
636 struct dn_ifaddr *ifa2;
637
638 ASSERT_RTNL();
639
640 /* Scan device list */
641 rcu_read_lock();
642 for_each_netdev_rcu(&init_net, dev) {
643 dn_db = rcu_dereference(dev->dn_ptr);
644 if (dn_db == NULL)
645 continue;
646 for (ifa2 = rcu_dereference(dn_db->ifa_list);
647 ifa2 != NULL;
648 ifa2 = rcu_dereference(ifa2->ifa_next)) {
649 if (ifa2->ifa_local == ifa->ifa_local) {
650 found_it = 1;
651 break;
652 }
653 }
654 }
655 rcu_read_unlock();
656
657 if (found_it == 0) {
658 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
659
660 if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
661 if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
662 dn_fib_flush();
663 }
664 }
665 }
666
dn_fib_disable_addr(struct net_device * dev,int force)667 static void dn_fib_disable_addr(struct net_device *dev, int force)
668 {
669 if (dn_fib_sync_down(0, dev, force))
670 dn_fib_flush();
671 dn_rt_cache_flush(0);
672 neigh_ifdown(&dn_neigh_table, dev);
673 }
674
dn_fib_dnaddr_event(struct notifier_block * this,unsigned long event,void * ptr)675 static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
676 {
677 struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
678
679 switch (event) {
680 case NETDEV_UP:
681 dn_fib_add_ifaddr(ifa);
682 dn_fib_sync_up(ifa->ifa_dev->dev);
683 dn_rt_cache_flush(-1);
684 break;
685 case NETDEV_DOWN:
686 dn_fib_del_ifaddr(ifa);
687 if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
688 dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
689 } else {
690 dn_rt_cache_flush(-1);
691 }
692 break;
693 }
694 return NOTIFY_DONE;
695 }
696
dn_fib_sync_down(__le16 local,struct net_device * dev,int force)697 static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force)
698 {
699 int ret = 0;
700 int scope = RT_SCOPE_NOWHERE;
701
702 if (force)
703 scope = -1;
704
705 for_fib_info() {
706 /*
707 * This makes no sense for DECnet.... we will almost
708 * certainly have more than one local address the same
709 * over all our interfaces. It needs thinking about
710 * some more.
711 */
712 if (local && fi->fib_prefsrc == local) {
713 fi->fib_flags |= RTNH_F_DEAD;
714 ret++;
715 } else if (dev && fi->fib_nhs) {
716 int dead = 0;
717
718 change_nexthops(fi) {
719 if (nh->nh_flags&RTNH_F_DEAD)
720 dead++;
721 else if (nh->nh_dev == dev &&
722 nh->nh_scope != scope) {
723 spin_lock_bh(&dn_fib_multipath_lock);
724 nh->nh_flags |= RTNH_F_DEAD;
725 fi->fib_power -= nh->nh_power;
726 nh->nh_power = 0;
727 spin_unlock_bh(&dn_fib_multipath_lock);
728 dead++;
729 }
730 } endfor_nexthops(fi)
731 if (dead == fi->fib_nhs) {
732 fi->fib_flags |= RTNH_F_DEAD;
733 ret++;
734 }
735 }
736 } endfor_fib_info();
737 return ret;
738 }
739
740
dn_fib_sync_up(struct net_device * dev)741 static int dn_fib_sync_up(struct net_device *dev)
742 {
743 int ret = 0;
744
745 if (!(dev->flags&IFF_UP))
746 return 0;
747
748 for_fib_info() {
749 int alive = 0;
750
751 change_nexthops(fi) {
752 if (!(nh->nh_flags&RTNH_F_DEAD)) {
753 alive++;
754 continue;
755 }
756 if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
757 continue;
758 if (nh->nh_dev != dev || dev->dn_ptr == NULL)
759 continue;
760 alive++;
761 spin_lock_bh(&dn_fib_multipath_lock);
762 nh->nh_power = 0;
763 nh->nh_flags &= ~RTNH_F_DEAD;
764 spin_unlock_bh(&dn_fib_multipath_lock);
765 } endfor_nexthops(fi);
766
767 if (alive > 0) {
768 fi->fib_flags &= ~RTNH_F_DEAD;
769 ret++;
770 }
771 } endfor_fib_info();
772 return ret;
773 }
774
775 static struct notifier_block dn_fib_dnaddr_notifier = {
776 .notifier_call = dn_fib_dnaddr_event,
777 };
778
dn_fib_cleanup(void)779 void __exit dn_fib_cleanup(void)
780 {
781 dn_fib_table_cleanup();
782 dn_fib_rules_cleanup();
783
784 unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
785 }
786
787
dn_fib_init(void)788 void __init dn_fib_init(void)
789 {
790 dn_fib_table_init();
791 dn_fib_rules_init();
792
793 register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
794
795 rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_NEWROUTE,
796 dn_fib_rtm_newroute, NULL, 0);
797 rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_DELROUTE,
798 dn_fib_rtm_delroute, NULL, 0);
799 }
800