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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 #include <net/nexthop.h>
45 
46 #define RT_MIN_TABLE 1
47 
48 #define for_fib_info() { struct dn_fib_info *fi;\
49 	for(fi = dn_fib_info_list; fi; fi = fi->fib_next)
50 #define endfor_fib_info() }
51 
52 #define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
53 	for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
54 
55 #define change_nexthops(fi) { int nhsel; struct dn_fib_nh *nh;\
56 	for(nhsel = 0, nh = (struct dn_fib_nh *)((fi)->fib_nh); nhsel < (fi)->fib_nhs; nh++, nhsel++)
57 
58 #define endfor_nexthops(fi) }
59 
60 static DEFINE_SPINLOCK(dn_fib_multipath_lock);
61 static struct dn_fib_info *dn_fib_info_list;
62 static DEFINE_SPINLOCK(dn_fib_info_lock);
63 
64 static struct
65 {
66 	int error;
67 	u8 scope;
68 } dn_fib_props[RTN_MAX+1] = {
69 	[RTN_UNSPEC] =      { .error = 0,       .scope = RT_SCOPE_NOWHERE },
70 	[RTN_UNICAST] =     { .error = 0,       .scope = RT_SCOPE_UNIVERSE },
71 	[RTN_LOCAL] =       { .error = 0,       .scope = RT_SCOPE_HOST },
72 	[RTN_BROADCAST] =   { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
73 	[RTN_ANYCAST] =     { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
74 	[RTN_MULTICAST] =   { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
75 	[RTN_BLACKHOLE] =   { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE },
76 	[RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE },
77 	[RTN_PROHIBIT] =    { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE },
78 	[RTN_THROW] =       { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE },
79 	[RTN_NAT] =         { .error = 0,       .scope = RT_SCOPE_NOWHERE },
80 	[RTN_XRESOLVE] =    { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
81 };
82 
83 static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force);
84 static int dn_fib_sync_up(struct net_device *dev);
85 
dn_fib_free_info(struct dn_fib_info * fi)86 void dn_fib_free_info(struct dn_fib_info *fi)
87 {
88 	if (fi->fib_dead == 0) {
89 		printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n");
90 		return;
91 	}
92 
93 	change_nexthops(fi) {
94 		if (nh->nh_dev)
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 && --fi->fib_treeref == 0) {
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(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), 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 		ofi->fib_treeref++;
388 		return ofi;
389 	}
390 
391 	fi->fib_treeref++;
392 	atomic_inc(&fi->fib_clntref);
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 			atomic_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 				atomic_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)504 static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
505 {
506 	struct net *net = sock_net(skb->sk);
507 	struct dn_fib_table *tb;
508 	struct rtmsg *r = nlmsg_data(nlh);
509 	struct nlattr *attrs[RTA_MAX+1];
510 	int err;
511 
512 	if (!netlink_capable(skb, CAP_NET_ADMIN))
513 		return -EPERM;
514 
515 	if (!net_eq(net, &init_net))
516 		return -EINVAL;
517 
518 	err = nlmsg_parse(nlh, sizeof(*r), attrs, RTA_MAX, rtm_dn_policy);
519 	if (err < 0)
520 		return err;
521 
522 	tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 0);
523 	if (!tb)
524 		return -ESRCH;
525 
526 	return tb->delete(tb, r, attrs, nlh, &NETLINK_CB(skb));
527 }
528 
dn_fib_rtm_newroute(struct sk_buff * skb,struct nlmsghdr * nlh)529 static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
530 {
531 	struct net *net = sock_net(skb->sk);
532 	struct dn_fib_table *tb;
533 	struct rtmsg *r = nlmsg_data(nlh);
534 	struct nlattr *attrs[RTA_MAX+1];
535 	int err;
536 
537 	if (!netlink_capable(skb, CAP_NET_ADMIN))
538 		return -EPERM;
539 
540 	if (!net_eq(net, &init_net))
541 		return -EINVAL;
542 
543 	err = nlmsg_parse(nlh, sizeof(*r), attrs, RTA_MAX, rtm_dn_policy);
544 	if (err < 0)
545 		return err;
546 
547 	tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 1);
548 	if (!tb)
549 		return -ENOBUFS;
550 
551 	return tb->insert(tb, r, attrs, nlh, &NETLINK_CB(skb));
552 }
553 
fib_magic(int cmd,int type,__le16 dst,int dst_len,struct dn_ifaddr * ifa)554 static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
555 {
556 	struct dn_fib_table *tb;
557 	struct {
558 		struct nlmsghdr nlh;
559 		struct rtmsg rtm;
560 	} req;
561 	struct {
562 		struct nlattr hdr;
563 		__le16 dst;
564 	} dst_attr = {
565 		.dst = dst,
566 	};
567 	struct {
568 		struct nlattr hdr;
569 		__le16 prefsrc;
570 	} prefsrc_attr = {
571 		.prefsrc = ifa->ifa_local,
572 	};
573 	struct {
574 		struct nlattr hdr;
575 		u32 oif;
576 	} oif_attr = {
577 		.oif = ifa->ifa_dev->dev->ifindex,
578 	};
579 	struct nlattr *attrs[RTA_MAX+1] = {
580 		[RTA_DST] = (struct nlattr *) &dst_attr,
581 		[RTA_PREFSRC] = (struct nlattr * ) &prefsrc_attr,
582 		[RTA_OIF] = (struct nlattr *) &oif_attr,
583 	};
584 
585 	memset(&req.rtm, 0, sizeof(req.rtm));
586 
587 	if (type == RTN_UNICAST)
588 		tb = dn_fib_get_table(RT_MIN_TABLE, 1);
589 	else
590 		tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
591 
592 	if (tb == NULL)
593 		return;
594 
595 	req.nlh.nlmsg_len = sizeof(req);
596 	req.nlh.nlmsg_type = cmd;
597 	req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
598 	req.nlh.nlmsg_pid = 0;
599 	req.nlh.nlmsg_seq = 0;
600 
601 	req.rtm.rtm_dst_len = dst_len;
602 	req.rtm.rtm_table = tb->n;
603 	req.rtm.rtm_protocol = RTPROT_KERNEL;
604 	req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
605 	req.rtm.rtm_type = type;
606 
607 	if (cmd == RTM_NEWROUTE)
608 		tb->insert(tb, &req.rtm, attrs, &req.nlh, NULL);
609 	else
610 		tb->delete(tb, &req.rtm, attrs, &req.nlh, NULL);
611 }
612 
dn_fib_add_ifaddr(struct dn_ifaddr * ifa)613 static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
614 {
615 
616 	fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
617 
618 #if 0
619 	if (!(dev->flags&IFF_UP))
620 		return;
621 	/* In the future, we will want to add default routes here */
622 
623 #endif
624 }
625 
dn_fib_del_ifaddr(struct dn_ifaddr * ifa)626 static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
627 {
628 	int found_it = 0;
629 	struct net_device *dev;
630 	struct dn_dev *dn_db;
631 	struct dn_ifaddr *ifa2;
632 
633 	ASSERT_RTNL();
634 
635 	/* Scan device list */
636 	rcu_read_lock();
637 	for_each_netdev_rcu(&init_net, dev) {
638 		dn_db = rcu_dereference(dev->dn_ptr);
639 		if (dn_db == NULL)
640 			continue;
641 		for (ifa2 = rcu_dereference(dn_db->ifa_list);
642 		     ifa2 != NULL;
643 		     ifa2 = rcu_dereference(ifa2->ifa_next)) {
644 			if (ifa2->ifa_local == ifa->ifa_local) {
645 				found_it = 1;
646 				break;
647 			}
648 		}
649 	}
650 	rcu_read_unlock();
651 
652 	if (found_it == 0) {
653 		fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
654 
655 		if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
656 			if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
657 				dn_fib_flush();
658 		}
659 	}
660 }
661 
dn_fib_disable_addr(struct net_device * dev,int force)662 static void dn_fib_disable_addr(struct net_device *dev, int force)
663 {
664 	if (dn_fib_sync_down(0, dev, force))
665 		dn_fib_flush();
666 	dn_rt_cache_flush(0);
667 	neigh_ifdown(&dn_neigh_table, dev);
668 }
669 
dn_fib_dnaddr_event(struct notifier_block * this,unsigned long event,void * ptr)670 static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
671 {
672 	struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
673 
674 	switch (event) {
675 	case NETDEV_UP:
676 		dn_fib_add_ifaddr(ifa);
677 		dn_fib_sync_up(ifa->ifa_dev->dev);
678 		dn_rt_cache_flush(-1);
679 		break;
680 	case NETDEV_DOWN:
681 		dn_fib_del_ifaddr(ifa);
682 		if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
683 			dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
684 		} else {
685 			dn_rt_cache_flush(-1);
686 		}
687 		break;
688 	}
689 	return NOTIFY_DONE;
690 }
691 
dn_fib_sync_down(__le16 local,struct net_device * dev,int force)692 static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force)
693 {
694 	int ret = 0;
695 	int scope = RT_SCOPE_NOWHERE;
696 
697 	if (force)
698 		scope = -1;
699 
700 	for_fib_info() {
701 		/*
702 		 * This makes no sense for DECnet.... we will almost
703 		 * certainly have more than one local address the same
704 		 * over all our interfaces. It needs thinking about
705 		 * some more.
706 		 */
707 		if (local && fi->fib_prefsrc == local) {
708 			fi->fib_flags |= RTNH_F_DEAD;
709 			ret++;
710 		} else if (dev && fi->fib_nhs) {
711 			int dead = 0;
712 
713 			change_nexthops(fi) {
714 				if (nh->nh_flags&RTNH_F_DEAD)
715 					dead++;
716 				else if (nh->nh_dev == dev &&
717 						nh->nh_scope != scope) {
718 					spin_lock_bh(&dn_fib_multipath_lock);
719 					nh->nh_flags |= RTNH_F_DEAD;
720 					fi->fib_power -= nh->nh_power;
721 					nh->nh_power = 0;
722 					spin_unlock_bh(&dn_fib_multipath_lock);
723 					dead++;
724 				}
725 			} endfor_nexthops(fi)
726 			if (dead == fi->fib_nhs) {
727 				fi->fib_flags |= RTNH_F_DEAD;
728 				ret++;
729 			}
730 		}
731 	} endfor_fib_info();
732 	return ret;
733 }
734 
735 
dn_fib_sync_up(struct net_device * dev)736 static int dn_fib_sync_up(struct net_device *dev)
737 {
738 	int ret = 0;
739 
740 	if (!(dev->flags&IFF_UP))
741 		return 0;
742 
743 	for_fib_info() {
744 		int alive = 0;
745 
746 		change_nexthops(fi) {
747 			if (!(nh->nh_flags&RTNH_F_DEAD)) {
748 				alive++;
749 				continue;
750 			}
751 			if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
752 				continue;
753 			if (nh->nh_dev != dev || dev->dn_ptr == NULL)
754 				continue;
755 			alive++;
756 			spin_lock_bh(&dn_fib_multipath_lock);
757 			nh->nh_power = 0;
758 			nh->nh_flags &= ~RTNH_F_DEAD;
759 			spin_unlock_bh(&dn_fib_multipath_lock);
760 		} endfor_nexthops(fi);
761 
762 		if (alive > 0) {
763 			fi->fib_flags &= ~RTNH_F_DEAD;
764 			ret++;
765 		}
766 	} endfor_fib_info();
767 	return ret;
768 }
769 
770 static struct notifier_block dn_fib_dnaddr_notifier = {
771 	.notifier_call = dn_fib_dnaddr_event,
772 };
773 
dn_fib_cleanup(void)774 void __exit dn_fib_cleanup(void)
775 {
776 	dn_fib_table_cleanup();
777 	dn_fib_rules_cleanup();
778 
779 	unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
780 }
781 
782 
dn_fib_init(void)783 void __init dn_fib_init(void)
784 {
785 	dn_fib_table_init();
786 	dn_fib_rules_init();
787 
788 	register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
789 
790 	rtnl_register(PF_DECnet, RTM_NEWROUTE, dn_fib_rtm_newroute, NULL, NULL);
791 	rtnl_register(PF_DECnet, RTM_DELROUTE, dn_fib_rtm_delroute, NULL, NULL);
792 }
793 
794 
795