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_get_attr16(struct rtattr * attr,int attrlen,int type)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
dn_fib_count_nhs(struct rtattr * rta)159 static 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
dn_fib_get_nhs(struct dn_fib_info * fi,const struct rtattr * rta,const struct rtmsg * r)175 static 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
dn_fib_check_nh(const struct rtmsg * r,struct dn_fib_info * fi,struct dn_fib_nh * nh)199 static 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;
248 out:
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
dn_fib_create_info(const struct rtmsg * r,struct dn_kern_rta * rta,const struct nlmsghdr * nlh,int * errp)271 struct 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 flavour = attr->rta_type;
306 if (flavour) {
307 if (flavour > RTAX_MAX)
308 goto err_inval;
309 fi->fib_metrics[flavour-1] = *(unsigned*)RTA_DATA(attr);
310 }
311 attr = RTA_NEXT(attr, attrlen);
312 }
313 }
314 if (rta->rta_prefsrc)
315 memcpy(&fi->fib_prefsrc, rta->rta_prefsrc, 2);
316
317 if (rta->rta_mp) {
318 if ((err = dn_fib_get_nhs(fi, rta->rta_mp, r)) != 0)
319 goto failure;
320 if (rta->rta_oif && fi->fib_nh->nh_oif != *rta->rta_oif)
321 goto err_inval;
322 if (rta->rta_gw && memcmp(&fi->fib_nh->nh_gw, rta->rta_gw, 2))
323 goto err_inval;
324 } else {
325 struct dn_fib_nh *nh = fi->fib_nh;
326 if (rta->rta_oif)
327 nh->nh_oif = *rta->rta_oif;
328 if (rta->rta_gw)
329 memcpy(&nh->nh_gw, rta->rta_gw, 2);
330 nh->nh_flags = r->rtm_flags;
331 nh->nh_weight = 1;
332 }
333
334 if (r->rtm_type == RTN_NAT) {
335 if (rta->rta_gw == NULL || nhs != 1 || rta->rta_oif)
336 goto err_inval;
337 memcpy(&fi->fib_nh->nh_gw, rta->rta_gw, 2);
338 goto link_it;
339 }
340
341 if (dn_fib_props[r->rtm_type].error) {
342 if (rta->rta_gw || rta->rta_oif || rta->rta_mp)
343 goto err_inval;
344 goto link_it;
345 }
346
347 if (r->rtm_scope > RT_SCOPE_HOST)
348 goto err_inval;
349
350 if (r->rtm_scope == RT_SCOPE_HOST) {
351 struct dn_fib_nh *nh = fi->fib_nh;
352
353 /* Local address is added */
354 if (nhs != 1 || nh->nh_gw)
355 goto err_inval;
356 nh->nh_scope = RT_SCOPE_NOWHERE;
357 nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif);
358 err = -ENODEV;
359 if (nh->nh_dev == NULL)
360 goto failure;
361 } else {
362 change_nexthops(fi) {
363 if ((err = dn_fib_check_nh(r, fi, nh)) != 0)
364 goto failure;
365 } endfor_nexthops(fi)
366 }
367
368 if (fi->fib_prefsrc) {
369 if (r->rtm_type != RTN_LOCAL || rta->rta_dst == NULL ||
370 memcmp(&fi->fib_prefsrc, rta->rta_dst, 2))
371 if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
372 goto err_inval;
373 }
374
375 link_it:
376 if ((ofi = dn_fib_find_info(fi)) != NULL) {
377 fi->fib_dead = 1;
378 dn_fib_free_info(fi);
379 ofi->fib_treeref++;
380 return ofi;
381 }
382
383 fi->fib_treeref++;
384 atomic_inc(&fi->fib_clntref);
385 spin_lock(&dn_fib_info_lock);
386 fi->fib_next = dn_fib_info_list;
387 fi->fib_prev = NULL;
388 if (dn_fib_info_list)
389 dn_fib_info_list->fib_prev = fi;
390 dn_fib_info_list = fi;
391 spin_unlock(&dn_fib_info_lock);
392 return fi;
393
394 err_inval:
395 err = -EINVAL;
396
397 failure:
398 *errp = err;
399 if (fi) {
400 fi->fib_dead = 1;
401 dn_fib_free_info(fi);
402 }
403
404 return NULL;
405 }
406
dn_fib_semantic_match(int type,struct dn_fib_info * fi,const struct flowidn * fld,struct dn_fib_res * res)407 int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowidn *fld, struct dn_fib_res *res)
408 {
409 int err = dn_fib_props[type].error;
410
411 if (err == 0) {
412 if (fi->fib_flags & RTNH_F_DEAD)
413 return 1;
414
415 res->fi = fi;
416
417 switch (type) {
418 case RTN_NAT:
419 DN_FIB_RES_RESET(*res);
420 atomic_inc(&fi->fib_clntref);
421 return 0;
422 case RTN_UNICAST:
423 case RTN_LOCAL:
424 for_nexthops(fi) {
425 if (nh->nh_flags & RTNH_F_DEAD)
426 continue;
427 if (!fld->flowidn_oif ||
428 fld->flowidn_oif == nh->nh_oif)
429 break;
430 }
431 if (nhsel < fi->fib_nhs) {
432 res->nh_sel = nhsel;
433 atomic_inc(&fi->fib_clntref);
434 return 0;
435 }
436 endfor_nexthops(fi);
437 res->fi = NULL;
438 return 1;
439 default:
440 if (net_ratelimit())
441 printk("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
dn_fib_select_multipath(const struct flowidn * fld,struct dn_fib_res * res)450 void 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
dn_fib_check_attr(struct rtmsg * r,struct rtattr ** rta)490 static 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
dn_fib_rtm_delroute(struct sk_buff * skb,struct nlmsghdr * nlh,void * arg)508 static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
509 {
510 struct net *net = sock_net(skb->sk);
511 struct dn_fib_table *tb;
512 struct rtattr **rta = arg;
513 struct rtmsg *r = NLMSG_DATA(nlh);
514
515 if (!net_eq(net, &init_net))
516 return -EINVAL;
517
518 if (dn_fib_check_attr(r, rta))
519 return -EINVAL;
520
521 tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 0);
522 if (tb)
523 return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
524
525 return -ESRCH;
526 }
527
dn_fib_rtm_newroute(struct sk_buff * skb,struct nlmsghdr * nlh,void * arg)528 static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
529 {
530 struct net *net = sock_net(skb->sk);
531 struct dn_fib_table *tb;
532 struct rtattr **rta = arg;
533 struct rtmsg *r = NLMSG_DATA(nlh);
534
535 if (!net_eq(net, &init_net))
536 return -EINVAL;
537
538 if (dn_fib_check_attr(r, rta))
539 return -EINVAL;
540
541 tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 1);
542 if (tb)
543 return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
544
545 return -ENOBUFS;
546 }
547
fib_magic(int cmd,int type,__le16 dst,int dst_len,struct dn_ifaddr * ifa)548 static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
549 {
550 struct dn_fib_table *tb;
551 struct {
552 struct nlmsghdr nlh;
553 struct rtmsg rtm;
554 } req;
555 struct dn_kern_rta rta;
556
557 memset(&req.rtm, 0, sizeof(req.rtm));
558 memset(&rta, 0, sizeof(rta));
559
560 if (type == RTN_UNICAST)
561 tb = dn_fib_get_table(RT_MIN_TABLE, 1);
562 else
563 tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
564
565 if (tb == NULL)
566 return;
567
568 req.nlh.nlmsg_len = sizeof(req);
569 req.nlh.nlmsg_type = cmd;
570 req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
571 req.nlh.nlmsg_pid = 0;
572 req.nlh.nlmsg_seq = 0;
573
574 req.rtm.rtm_dst_len = dst_len;
575 req.rtm.rtm_table = tb->n;
576 req.rtm.rtm_protocol = RTPROT_KERNEL;
577 req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
578 req.rtm.rtm_type = type;
579
580 rta.rta_dst = &dst;
581 rta.rta_prefsrc = &ifa->ifa_local;
582 rta.rta_oif = &ifa->ifa_dev->dev->ifindex;
583
584 if (cmd == RTM_NEWROUTE)
585 tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL);
586 else
587 tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL);
588 }
589
dn_fib_add_ifaddr(struct dn_ifaddr * ifa)590 static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
591 {
592
593 fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
594
595 #if 0
596 if (!(dev->flags&IFF_UP))
597 return;
598 /* In the future, we will want to add default routes here */
599
600 #endif
601 }
602
dn_fib_del_ifaddr(struct dn_ifaddr * ifa)603 static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
604 {
605 int found_it = 0;
606 struct net_device *dev;
607 struct dn_dev *dn_db;
608 struct dn_ifaddr *ifa2;
609
610 ASSERT_RTNL();
611
612 /* Scan device list */
613 rcu_read_lock();
614 for_each_netdev_rcu(&init_net, dev) {
615 dn_db = rcu_dereference(dev->dn_ptr);
616 if (dn_db == NULL)
617 continue;
618 for (ifa2 = rcu_dereference(dn_db->ifa_list);
619 ifa2 != NULL;
620 ifa2 = rcu_dereference(ifa2->ifa_next)) {
621 if (ifa2->ifa_local == ifa->ifa_local) {
622 found_it = 1;
623 break;
624 }
625 }
626 }
627 rcu_read_unlock();
628
629 if (found_it == 0) {
630 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
631
632 if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
633 if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
634 dn_fib_flush();
635 }
636 }
637 }
638
dn_fib_disable_addr(struct net_device * dev,int force)639 static void dn_fib_disable_addr(struct net_device *dev, int force)
640 {
641 if (dn_fib_sync_down(0, dev, force))
642 dn_fib_flush();
643 dn_rt_cache_flush(0);
644 neigh_ifdown(&dn_neigh_table, dev);
645 }
646
dn_fib_dnaddr_event(struct notifier_block * this,unsigned long event,void * ptr)647 static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
648 {
649 struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
650
651 switch (event) {
652 case NETDEV_UP:
653 dn_fib_add_ifaddr(ifa);
654 dn_fib_sync_up(ifa->ifa_dev->dev);
655 dn_rt_cache_flush(-1);
656 break;
657 case NETDEV_DOWN:
658 dn_fib_del_ifaddr(ifa);
659 if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
660 dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
661 } else {
662 dn_rt_cache_flush(-1);
663 }
664 break;
665 }
666 return NOTIFY_DONE;
667 }
668
dn_fib_sync_down(__le16 local,struct net_device * dev,int force)669 static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force)
670 {
671 int ret = 0;
672 int scope = RT_SCOPE_NOWHERE;
673
674 if (force)
675 scope = -1;
676
677 for_fib_info() {
678 /*
679 * This makes no sense for DECnet.... we will almost
680 * certainly have more than one local address the same
681 * over all our interfaces. It needs thinking about
682 * some more.
683 */
684 if (local && fi->fib_prefsrc == local) {
685 fi->fib_flags |= RTNH_F_DEAD;
686 ret++;
687 } else if (dev && fi->fib_nhs) {
688 int dead = 0;
689
690 change_nexthops(fi) {
691 if (nh->nh_flags&RTNH_F_DEAD)
692 dead++;
693 else if (nh->nh_dev == dev &&
694 nh->nh_scope != scope) {
695 spin_lock_bh(&dn_fib_multipath_lock);
696 nh->nh_flags |= RTNH_F_DEAD;
697 fi->fib_power -= nh->nh_power;
698 nh->nh_power = 0;
699 spin_unlock_bh(&dn_fib_multipath_lock);
700 dead++;
701 }
702 } endfor_nexthops(fi)
703 if (dead == fi->fib_nhs) {
704 fi->fib_flags |= RTNH_F_DEAD;
705 ret++;
706 }
707 }
708 } endfor_fib_info();
709 return ret;
710 }
711
712
dn_fib_sync_up(struct net_device * dev)713 static int dn_fib_sync_up(struct net_device *dev)
714 {
715 int ret = 0;
716
717 if (!(dev->flags&IFF_UP))
718 return 0;
719
720 for_fib_info() {
721 int alive = 0;
722
723 change_nexthops(fi) {
724 if (!(nh->nh_flags&RTNH_F_DEAD)) {
725 alive++;
726 continue;
727 }
728 if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
729 continue;
730 if (nh->nh_dev != dev || dev->dn_ptr == NULL)
731 continue;
732 alive++;
733 spin_lock_bh(&dn_fib_multipath_lock);
734 nh->nh_power = 0;
735 nh->nh_flags &= ~RTNH_F_DEAD;
736 spin_unlock_bh(&dn_fib_multipath_lock);
737 } endfor_nexthops(fi);
738
739 if (alive > 0) {
740 fi->fib_flags &= ~RTNH_F_DEAD;
741 ret++;
742 }
743 } endfor_fib_info();
744 return ret;
745 }
746
747 static struct notifier_block dn_fib_dnaddr_notifier = {
748 .notifier_call = dn_fib_dnaddr_event,
749 };
750
dn_fib_cleanup(void)751 void __exit dn_fib_cleanup(void)
752 {
753 dn_fib_table_cleanup();
754 dn_fib_rules_cleanup();
755
756 unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
757 }
758
759
dn_fib_init(void)760 void __init dn_fib_init(void)
761 {
762 dn_fib_table_init();
763 dn_fib_rules_init();
764
765 register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
766
767 rtnl_register(PF_DECnet, RTM_NEWROUTE, dn_fib_rtm_newroute, NULL, NULL);
768 rtnl_register(PF_DECnet, RTM_DELROUTE, dn_fib_rtm_delroute, NULL, NULL);
769 }
770
771
772