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