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/sockios.h>
24 #include <linux/init.h>
25 #include <linux/skbuff.h>
26 #include <linux/netlink.h>
27 #include <linux/rtnetlink.h>
28 #include <linux/proc_fs.h>
29 #include <linux/netdevice.h>
30 #include <linux/timer.h>
31 #include <linux/spinlock.h>
32 #include <asm/atomic.h>
33 #include <asm/uaccess.h>
34 #include <net/neighbour.h>
35 #include <net/dst.h>
36 #include <net/flow.h>
37 #include <net/fib_rules.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 static DEFINE_SPINLOCK(dn_fib_multipath_lock);
59 static struct dn_fib_info *dn_fib_info_list;
60 static DEFINE_SPINLOCK(dn_fib_info_lock);
61
62 static struct
63 {
64 int error;
65 u8 scope;
66 } dn_fib_props[RTN_MAX+1] = {
67 [RTN_UNSPEC] = { .error = 0, .scope = RT_SCOPE_NOWHERE },
68 [RTN_UNICAST] = { .error = 0, .scope = RT_SCOPE_UNIVERSE },
69 [RTN_LOCAL] = { .error = 0, .scope = RT_SCOPE_HOST },
70 [RTN_BROADCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
71 [RTN_ANYCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
72 [RTN_MULTICAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
73 [RTN_BLACKHOLE] = { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE },
74 [RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE },
75 [RTN_PROHIBIT] = { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE },
76 [RTN_THROW] = { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE },
77 [RTN_NAT] = { .error = 0, .scope = RT_SCOPE_NOWHERE },
78 [RTN_XRESOLVE] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
79 };
80
81 static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force);
82 static int dn_fib_sync_up(struct net_device *dev);
83
dn_fib_free_info(struct dn_fib_info * fi)84 void dn_fib_free_info(struct dn_fib_info *fi)
85 {
86 if (fi->fib_dead == 0) {
87 printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n");
88 return;
89 }
90
91 change_nexthops(fi) {
92 if (nh->nh_dev)
93 dev_put(nh->nh_dev);
94 nh->nh_dev = NULL;
95 } endfor_nexthops(fi);
96 kfree(fi);
97 }
98
dn_fib_release_info(struct dn_fib_info * fi)99 void dn_fib_release_info(struct dn_fib_info *fi)
100 {
101 spin_lock(&dn_fib_info_lock);
102 if (fi && --fi->fib_treeref == 0) {
103 if (fi->fib_next)
104 fi->fib_next->fib_prev = fi->fib_prev;
105 if (fi->fib_prev)
106 fi->fib_prev->fib_next = fi->fib_next;
107 if (fi == dn_fib_info_list)
108 dn_fib_info_list = fi->fib_next;
109 fi->fib_dead = 1;
110 dn_fib_info_put(fi);
111 }
112 spin_unlock(&dn_fib_info_lock);
113 }
114
dn_fib_nh_comp(const struct dn_fib_info * fi,const struct dn_fib_info * ofi)115 static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi)
116 {
117 const struct dn_fib_nh *onh = ofi->fib_nh;
118
119 for_nexthops(fi) {
120 if (nh->nh_oif != onh->nh_oif ||
121 nh->nh_gw != onh->nh_gw ||
122 nh->nh_scope != onh->nh_scope ||
123 nh->nh_weight != onh->nh_weight ||
124 ((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD))
125 return -1;
126 onh++;
127 } endfor_nexthops(fi);
128 return 0;
129 }
130
dn_fib_find_info(const struct dn_fib_info * nfi)131 static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi)
132 {
133 for_fib_info() {
134 if (fi->fib_nhs != nfi->fib_nhs)
135 continue;
136 if (nfi->fib_protocol == fi->fib_protocol &&
137 nfi->fib_prefsrc == fi->fib_prefsrc &&
138 nfi->fib_priority == fi->fib_priority &&
139 memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 &&
140 ((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 &&
141 (nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0))
142 return fi;
143 } endfor_fib_info();
144 return NULL;
145 }
146
dn_fib_get_attr16(struct rtattr * attr,int attrlen,int type)147 __le16 dn_fib_get_attr16(struct rtattr *attr, int attrlen, int type)
148 {
149 while(RTA_OK(attr,attrlen)) {
150 if (attr->rta_type == type)
151 return *(__le16*)RTA_DATA(attr);
152 attr = RTA_NEXT(attr, attrlen);
153 }
154
155 return 0;
156 }
157
dn_fib_count_nhs(struct rtattr * rta)158 static int dn_fib_count_nhs(struct rtattr *rta)
159 {
160 int nhs = 0;
161 struct rtnexthop *nhp = RTA_DATA(rta);
162 int nhlen = RTA_PAYLOAD(rta);
163
164 while(nhlen >= (int)sizeof(struct rtnexthop)) {
165 if ((nhlen -= nhp->rtnh_len) < 0)
166 return 0;
167 nhs++;
168 nhp = RTNH_NEXT(nhp);
169 }
170
171 return nhs;
172 }
173
dn_fib_get_nhs(struct dn_fib_info * fi,const struct rtattr * rta,const struct rtmsg * r)174 static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct rtattr *rta, const struct rtmsg *r)
175 {
176 struct rtnexthop *nhp = RTA_DATA(rta);
177 int nhlen = RTA_PAYLOAD(rta);
178
179 change_nexthops(fi) {
180 int attrlen = nhlen - sizeof(struct rtnexthop);
181 if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
182 return -EINVAL;
183
184 nh->nh_flags = (r->rtm_flags&~0xFF) | nhp->rtnh_flags;
185 nh->nh_oif = nhp->rtnh_ifindex;
186 nh->nh_weight = nhp->rtnh_hops + 1;
187
188 if (attrlen) {
189 nh->nh_gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
190 }
191 nhp = RTNH_NEXT(nhp);
192 } endfor_nexthops(fi);
193
194 return 0;
195 }
196
197
dn_fib_check_nh(const struct rtmsg * r,struct dn_fib_info * fi,struct dn_fib_nh * nh)198 static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh)
199 {
200 int err;
201
202 if (nh->nh_gw) {
203 struct flowi fl;
204 struct dn_fib_res res;
205
206 if (nh->nh_flags&RTNH_F_ONLINK) {
207 struct net_device *dev;
208
209 if (r->rtm_scope >= RT_SCOPE_LINK)
210 return -EINVAL;
211 if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST)
212 return -EINVAL;
213 if ((dev = __dev_get_by_index(&init_net, nh->nh_oif)) == NULL)
214 return -ENODEV;
215 if (!(dev->flags&IFF_UP))
216 return -ENETDOWN;
217 nh->nh_dev = dev;
218 dev_hold(dev);
219 nh->nh_scope = RT_SCOPE_LINK;
220 return 0;
221 }
222
223 memset(&fl, 0, sizeof(fl));
224 fl.fld_dst = nh->nh_gw;
225 fl.oif = nh->nh_oif;
226 fl.fld_scope = r->rtm_scope + 1;
227
228 if (fl.fld_scope < RT_SCOPE_LINK)
229 fl.fld_scope = RT_SCOPE_LINK;
230
231 if ((err = dn_fib_lookup(&fl, &res)) != 0)
232 return err;
233
234 err = -EINVAL;
235 if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
236 goto out;
237 nh->nh_scope = res.scope;
238 nh->nh_oif = DN_FIB_RES_OIF(res);
239 nh->nh_dev = DN_FIB_RES_DEV(res);
240 if (nh->nh_dev == NULL)
241 goto out;
242 dev_hold(nh->nh_dev);
243 err = -ENETDOWN;
244 if (!(nh->nh_dev->flags & IFF_UP))
245 goto out;
246 err = 0;
247 out:
248 dn_fib_res_put(&res);
249 return err;
250 } else {
251 struct net_device *dev;
252
253 if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK))
254 return -EINVAL;
255
256 dev = __dev_get_by_index(&init_net, nh->nh_oif);
257 if (dev == NULL || dev->dn_ptr == NULL)
258 return -ENODEV;
259 if (!(dev->flags&IFF_UP))
260 return -ENETDOWN;
261 nh->nh_dev = dev;
262 dev_hold(nh->nh_dev);
263 nh->nh_scope = RT_SCOPE_HOST;
264 }
265
266 return 0;
267 }
268
269
dn_fib_create_info(const struct rtmsg * r,struct dn_kern_rta * rta,const struct nlmsghdr * nlh,int * errp)270 struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct dn_kern_rta *rta, const struct nlmsghdr *nlh, int *errp)
271 {
272 int err;
273 struct dn_fib_info *fi = NULL;
274 struct dn_fib_info *ofi;
275 int nhs = 1;
276
277 if (r->rtm_type > RTN_MAX)
278 goto err_inval;
279
280 if (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
281 goto err_inval;
282
283 if (rta->rta_mp) {
284 nhs = dn_fib_count_nhs(rta->rta_mp);
285 if (nhs == 0)
286 goto err_inval;
287 }
288
289 fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
290 err = -ENOBUFS;
291 if (fi == NULL)
292 goto failure;
293
294 fi->fib_protocol = r->rtm_protocol;
295 fi->fib_nhs = nhs;
296 fi->fib_flags = r->rtm_flags;
297 if (rta->rta_priority)
298 fi->fib_priority = *rta->rta_priority;
299 if (rta->rta_mx) {
300 int attrlen = RTA_PAYLOAD(rta->rta_mx);
301 struct rtattr *attr = RTA_DATA(rta->rta_mx);
302
303 while(RTA_OK(attr, attrlen)) {
304 unsigned flavour = attr->rta_type;
305 if (flavour) {
306 if (flavour > RTAX_MAX)
307 goto err_inval;
308 fi->fib_metrics[flavour-1] = *(unsigned*)RTA_DATA(attr);
309 }
310 attr = RTA_NEXT(attr, attrlen);
311 }
312 }
313 if (rta->rta_prefsrc)
314 memcpy(&fi->fib_prefsrc, rta->rta_prefsrc, 2);
315
316 if (rta->rta_mp) {
317 if ((err = dn_fib_get_nhs(fi, rta->rta_mp, r)) != 0)
318 goto failure;
319 if (rta->rta_oif && fi->fib_nh->nh_oif != *rta->rta_oif)
320 goto err_inval;
321 if (rta->rta_gw && memcmp(&fi->fib_nh->nh_gw, rta->rta_gw, 2))
322 goto err_inval;
323 } else {
324 struct dn_fib_nh *nh = fi->fib_nh;
325 if (rta->rta_oif)
326 nh->nh_oif = *rta->rta_oif;
327 if (rta->rta_gw)
328 memcpy(&nh->nh_gw, rta->rta_gw, 2);
329 nh->nh_flags = r->rtm_flags;
330 nh->nh_weight = 1;
331 }
332
333 if (r->rtm_type == RTN_NAT) {
334 if (rta->rta_gw == NULL || nhs != 1 || rta->rta_oif)
335 goto err_inval;
336 memcpy(&fi->fib_nh->nh_gw, rta->rta_gw, 2);
337 goto link_it;
338 }
339
340 if (dn_fib_props[r->rtm_type].error) {
341 if (rta->rta_gw || rta->rta_oif || rta->rta_mp)
342 goto err_inval;
343 goto link_it;
344 }
345
346 if (r->rtm_scope > RT_SCOPE_HOST)
347 goto err_inval;
348
349 if (r->rtm_scope == RT_SCOPE_HOST) {
350 struct dn_fib_nh *nh = fi->fib_nh;
351
352 /* Local address is added */
353 if (nhs != 1 || nh->nh_gw)
354 goto err_inval;
355 nh->nh_scope = RT_SCOPE_NOWHERE;
356 nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif);
357 err = -ENODEV;
358 if (nh->nh_dev == NULL)
359 goto failure;
360 } else {
361 change_nexthops(fi) {
362 if ((err = dn_fib_check_nh(r, fi, nh)) != 0)
363 goto failure;
364 } endfor_nexthops(fi)
365 }
366
367 if (fi->fib_prefsrc) {
368 if (r->rtm_type != RTN_LOCAL || rta->rta_dst == NULL ||
369 memcmp(&fi->fib_prefsrc, rta->rta_dst, 2))
370 if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
371 goto err_inval;
372 }
373
374 link_it:
375 if ((ofi = dn_fib_find_info(fi)) != NULL) {
376 fi->fib_dead = 1;
377 dn_fib_free_info(fi);
378 ofi->fib_treeref++;
379 return ofi;
380 }
381
382 fi->fib_treeref++;
383 atomic_inc(&fi->fib_clntref);
384 spin_lock(&dn_fib_info_lock);
385 fi->fib_next = dn_fib_info_list;
386 fi->fib_prev = NULL;
387 if (dn_fib_info_list)
388 dn_fib_info_list->fib_prev = fi;
389 dn_fib_info_list = fi;
390 spin_unlock(&dn_fib_info_lock);
391 return fi;
392
393 err_inval:
394 err = -EINVAL;
395
396 failure:
397 *errp = err;
398 if (fi) {
399 fi->fib_dead = 1;
400 dn_fib_free_info(fi);
401 }
402
403 return NULL;
404 }
405
dn_fib_semantic_match(int type,struct dn_fib_info * fi,const struct flowi * fl,struct dn_fib_res * res)406 int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowi *fl, struct dn_fib_res *res)
407 {
408 int err = dn_fib_props[type].error;
409
410 if (err == 0) {
411 if (fi->fib_flags & RTNH_F_DEAD)
412 return 1;
413
414 res->fi = fi;
415
416 switch(type) {
417 case RTN_NAT:
418 DN_FIB_RES_RESET(*res);
419 atomic_inc(&fi->fib_clntref);
420 return 0;
421 case RTN_UNICAST:
422 case RTN_LOCAL:
423 for_nexthops(fi) {
424 if (nh->nh_flags & RTNH_F_DEAD)
425 continue;
426 if (!fl->oif || fl->oif == nh->nh_oif)
427 break;
428 }
429 if (nhsel < fi->fib_nhs) {
430 res->nh_sel = nhsel;
431 atomic_inc(&fi->fib_clntref);
432 return 0;
433 }
434 endfor_nexthops(fi);
435 res->fi = NULL;
436 return 1;
437 default:
438 if (net_ratelimit())
439 printk("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n", type);
440 res->fi = NULL;
441 return -EINVAL;
442 }
443 }
444 return err;
445 }
446
dn_fib_select_multipath(const struct flowi * fl,struct dn_fib_res * res)447 void dn_fib_select_multipath(const struct flowi *fl, struct dn_fib_res *res)
448 {
449 struct dn_fib_info *fi = res->fi;
450 int w;
451
452 spin_lock_bh(&dn_fib_multipath_lock);
453 if (fi->fib_power <= 0) {
454 int power = 0;
455 change_nexthops(fi) {
456 if (!(nh->nh_flags&RTNH_F_DEAD)) {
457 power += nh->nh_weight;
458 nh->nh_power = nh->nh_weight;
459 }
460 } endfor_nexthops(fi);
461 fi->fib_power = power;
462 if (power < 0) {
463 spin_unlock_bh(&dn_fib_multipath_lock);
464 res->nh_sel = 0;
465 return;
466 }
467 }
468
469 w = jiffies % fi->fib_power;
470
471 change_nexthops(fi) {
472 if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
473 if ((w -= nh->nh_power) <= 0) {
474 nh->nh_power--;
475 fi->fib_power--;
476 res->nh_sel = nhsel;
477 spin_unlock_bh(&dn_fib_multipath_lock);
478 return;
479 }
480 }
481 } endfor_nexthops(fi);
482 res->nh_sel = 0;
483 spin_unlock_bh(&dn_fib_multipath_lock);
484 }
485
486
dn_fib_check_attr(struct rtmsg * r,struct rtattr ** rta)487 static int dn_fib_check_attr(struct rtmsg *r, struct rtattr **rta)
488 {
489 int i;
490
491 for(i = 1; i <= RTA_MAX; i++) {
492 struct rtattr *attr = rta[i-1];
493 if (attr) {
494 if (RTA_PAYLOAD(attr) < 4 && RTA_PAYLOAD(attr) != 2)
495 return -EINVAL;
496 if (i != RTA_MULTIPATH && i != RTA_METRICS &&
497 i != RTA_TABLE)
498 rta[i-1] = (struct rtattr *)RTA_DATA(attr);
499 }
500 }
501
502 return 0;
503 }
504
dn_fib_rtm_delroute(struct sk_buff * skb,struct nlmsghdr * nlh,void * arg)505 static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
506 {
507 struct net *net = sock_net(skb->sk);
508 struct dn_fib_table *tb;
509 struct rtattr **rta = arg;
510 struct rtmsg *r = NLMSG_DATA(nlh);
511
512 if (net != &init_net)
513 return -EINVAL;
514
515 if (dn_fib_check_attr(r, rta))
516 return -EINVAL;
517
518 tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 0);
519 if (tb)
520 return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
521
522 return -ESRCH;
523 }
524
dn_fib_rtm_newroute(struct sk_buff * skb,struct nlmsghdr * nlh,void * arg)525 static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
526 {
527 struct net *net = sock_net(skb->sk);
528 struct dn_fib_table *tb;
529 struct rtattr **rta = arg;
530 struct rtmsg *r = NLMSG_DATA(nlh);
531
532 if (net != &init_net)
533 return -EINVAL;
534
535 if (dn_fib_check_attr(r, rta))
536 return -EINVAL;
537
538 tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 1);
539 if (tb)
540 return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
541
542 return -ENOBUFS;
543 }
544
fib_magic(int cmd,int type,__le16 dst,int dst_len,struct dn_ifaddr * ifa)545 static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
546 {
547 struct dn_fib_table *tb;
548 struct {
549 struct nlmsghdr nlh;
550 struct rtmsg rtm;
551 } req;
552 struct dn_kern_rta rta;
553
554 memset(&req.rtm, 0, sizeof(req.rtm));
555 memset(&rta, 0, sizeof(rta));
556
557 if (type == RTN_UNICAST)
558 tb = dn_fib_get_table(RT_MIN_TABLE, 1);
559 else
560 tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
561
562 if (tb == NULL)
563 return;
564
565 req.nlh.nlmsg_len = sizeof(req);
566 req.nlh.nlmsg_type = cmd;
567 req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
568 req.nlh.nlmsg_pid = 0;
569 req.nlh.nlmsg_seq = 0;
570
571 req.rtm.rtm_dst_len = dst_len;
572 req.rtm.rtm_table = tb->n;
573 req.rtm.rtm_protocol = RTPROT_KERNEL;
574 req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
575 req.rtm.rtm_type = type;
576
577 rta.rta_dst = &dst;
578 rta.rta_prefsrc = &ifa->ifa_local;
579 rta.rta_oif = &ifa->ifa_dev->dev->ifindex;
580
581 if (cmd == RTM_NEWROUTE)
582 tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL);
583 else
584 tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL);
585 }
586
dn_fib_add_ifaddr(struct dn_ifaddr * ifa)587 static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
588 {
589
590 fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
591
592 #if 0
593 if (!(dev->flags&IFF_UP))
594 return;
595 /* In the future, we will want to add default routes here */
596
597 #endif
598 }
599
dn_fib_del_ifaddr(struct dn_ifaddr * ifa)600 static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
601 {
602 int found_it = 0;
603 struct net_device *dev;
604 struct dn_dev *dn_db;
605 struct dn_ifaddr *ifa2;
606
607 ASSERT_RTNL();
608
609 /* Scan device list */
610 read_lock(&dev_base_lock);
611 for_each_netdev(&init_net, dev) {
612 dn_db = dev->dn_ptr;
613 if (dn_db == NULL)
614 continue;
615 for(ifa2 = dn_db->ifa_list; ifa2; ifa2 = ifa2->ifa_next) {
616 if (ifa2->ifa_local == ifa->ifa_local) {
617 found_it = 1;
618 break;
619 }
620 }
621 }
622 read_unlock(&dev_base_lock);
623
624 if (found_it == 0) {
625 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
626
627 if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
628 if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
629 dn_fib_flush();
630 }
631 }
632 }
633
dn_fib_disable_addr(struct net_device * dev,int force)634 static void dn_fib_disable_addr(struct net_device *dev, int force)
635 {
636 if (dn_fib_sync_down(0, dev, force))
637 dn_fib_flush();
638 dn_rt_cache_flush(0);
639 neigh_ifdown(&dn_neigh_table, dev);
640 }
641
dn_fib_dnaddr_event(struct notifier_block * this,unsigned long event,void * ptr)642 static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
643 {
644 struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
645
646 switch(event) {
647 case NETDEV_UP:
648 dn_fib_add_ifaddr(ifa);
649 dn_fib_sync_up(ifa->ifa_dev->dev);
650 dn_rt_cache_flush(-1);
651 break;
652 case NETDEV_DOWN:
653 dn_fib_del_ifaddr(ifa);
654 if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
655 dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
656 } else {
657 dn_rt_cache_flush(-1);
658 }
659 break;
660 }
661 return NOTIFY_DONE;
662 }
663
dn_fib_sync_down(__le16 local,struct net_device * dev,int force)664 static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force)
665 {
666 int ret = 0;
667 int scope = RT_SCOPE_NOWHERE;
668
669 if (force)
670 scope = -1;
671
672 for_fib_info() {
673 /*
674 * This makes no sense for DECnet.... we will almost
675 * certainly have more than one local address the same
676 * over all our interfaces. It needs thinking about
677 * some more.
678 */
679 if (local && fi->fib_prefsrc == local) {
680 fi->fib_flags |= RTNH_F_DEAD;
681 ret++;
682 } else if (dev && fi->fib_nhs) {
683 int dead = 0;
684
685 change_nexthops(fi) {
686 if (nh->nh_flags&RTNH_F_DEAD)
687 dead++;
688 else if (nh->nh_dev == dev &&
689 nh->nh_scope != scope) {
690 spin_lock_bh(&dn_fib_multipath_lock);
691 nh->nh_flags |= RTNH_F_DEAD;
692 fi->fib_power -= nh->nh_power;
693 nh->nh_power = 0;
694 spin_unlock_bh(&dn_fib_multipath_lock);
695 dead++;
696 }
697 } endfor_nexthops(fi)
698 if (dead == fi->fib_nhs) {
699 fi->fib_flags |= RTNH_F_DEAD;
700 ret++;
701 }
702 }
703 } endfor_fib_info();
704 return ret;
705 }
706
707
dn_fib_sync_up(struct net_device * dev)708 static int dn_fib_sync_up(struct net_device *dev)
709 {
710 int ret = 0;
711
712 if (!(dev->flags&IFF_UP))
713 return 0;
714
715 for_fib_info() {
716 int alive = 0;
717
718 change_nexthops(fi) {
719 if (!(nh->nh_flags&RTNH_F_DEAD)) {
720 alive++;
721 continue;
722 }
723 if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
724 continue;
725 if (nh->nh_dev != dev || dev->dn_ptr == NULL)
726 continue;
727 alive++;
728 spin_lock_bh(&dn_fib_multipath_lock);
729 nh->nh_power = 0;
730 nh->nh_flags &= ~RTNH_F_DEAD;
731 spin_unlock_bh(&dn_fib_multipath_lock);
732 } endfor_nexthops(fi);
733
734 if (alive > 0) {
735 fi->fib_flags &= ~RTNH_F_DEAD;
736 ret++;
737 }
738 } endfor_fib_info();
739 return ret;
740 }
741
742 static struct notifier_block dn_fib_dnaddr_notifier = {
743 .notifier_call = dn_fib_dnaddr_event,
744 };
745
dn_fib_cleanup(void)746 void __exit dn_fib_cleanup(void)
747 {
748 dn_fib_table_cleanup();
749 dn_fib_rules_cleanup();
750
751 unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
752 }
753
754
dn_fib_init(void)755 void __init dn_fib_init(void)
756 {
757 dn_fib_table_init();
758 dn_fib_rules_init();
759
760 register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
761
762 rtnl_register(PF_DECnet, RTM_NEWROUTE, dn_fib_rtm_newroute, NULL);
763 rtnl_register(PF_DECnet, RTM_DELROUTE, dn_fib_rtm_delroute, NULL);
764 }
765
766
767