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
59static DEFINE_SPINLOCK(dn_fib_multipath_lock);
60static struct dn_fib_info *dn_fib_info_list;
61static DEFINE_SPINLOCK(dn_fib_info_lock);
62
63static 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
82static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force);
83static int dn_fib_sync_up(struct net_device *dev);
84
85void 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
100void 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
116static 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
132static 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
148static int dn_fib_count_nhs(const struct nlattr *attr)
149{
150	struct rtnexthop *nhp = nla_data(attr);
151	int nhs = 0, nhlen = nla_len(attr);
152
153	while(nhlen >= (int)sizeof(struct rtnexthop)) {
154		if ((nhlen -= nhp->rtnh_len) < 0)
155			return 0;
156		nhs++;
157		nhp = RTNH_NEXT(nhp);
158	}
159
160	return nhs;
161}
162
163static 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 = nhlen - sizeof(struct rtnexthop);
171		if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
172			return -EINVAL;
173
174		nh->nh_flags  = (r->rtm_flags&~0xFF) | nhp->rtnh_flags;
175		nh->nh_oif    = nhp->rtnh_ifindex;
176		nh->nh_weight = nhp->rtnh_hops + 1;
177
178		if (attrlen) {
179			struct nlattr *gw_attr;
180
181			gw_attr = nla_find((struct nlattr *) (nhp + 1), attrlen, RTA_GATEWAY);
182			nh->nh_gw = gw_attr ? nla_get_le16(gw_attr) : 0;
183		}
184		nhp = RTNH_NEXT(nhp);
185	} endfor_nexthops(fi);
186
187	return 0;
188}
189
190
191static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh)
192{
193	int err;
194
195	if (nh->nh_gw) {
196		struct flowidn fld;
197		struct dn_fib_res res;
198
199		if (nh->nh_flags&RTNH_F_ONLINK) {
200			struct net_device *dev;
201
202			if (r->rtm_scope >= RT_SCOPE_LINK)
203				return -EINVAL;
204			if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST)
205				return -EINVAL;
206			if ((dev = __dev_get_by_index(&init_net, nh->nh_oif)) == NULL)
207				return -ENODEV;
208			if (!(dev->flags&IFF_UP))
209				return -ENETDOWN;
210			nh->nh_dev = dev;
211			dev_hold(dev);
212			nh->nh_scope = RT_SCOPE_LINK;
213			return 0;
214		}
215
216		memset(&fld, 0, sizeof(fld));
217		fld.daddr = nh->nh_gw;
218		fld.flowidn_oif = nh->nh_oif;
219		fld.flowidn_scope = r->rtm_scope + 1;
220
221		if (fld.flowidn_scope < RT_SCOPE_LINK)
222			fld.flowidn_scope = RT_SCOPE_LINK;
223
224		if ((err = dn_fib_lookup(&fld, &res)) != 0)
225			return err;
226
227		err = -EINVAL;
228		if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
229			goto out;
230		nh->nh_scope = res.scope;
231		nh->nh_oif = DN_FIB_RES_OIF(res);
232		nh->nh_dev = DN_FIB_RES_DEV(res);
233		if (nh->nh_dev == NULL)
234			goto out;
235		dev_hold(nh->nh_dev);
236		err = -ENETDOWN;
237		if (!(nh->nh_dev->flags & IFF_UP))
238			goto out;
239		err = 0;
240out:
241		dn_fib_res_put(&res);
242		return err;
243	} else {
244		struct net_device *dev;
245
246		if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK))
247			return -EINVAL;
248
249		dev = __dev_get_by_index(&init_net, nh->nh_oif);
250		if (dev == NULL || dev->dn_ptr == NULL)
251			return -ENODEV;
252		if (!(dev->flags&IFF_UP))
253			return -ENETDOWN;
254		nh->nh_dev = dev;
255		dev_hold(nh->nh_dev);
256		nh->nh_scope = RT_SCOPE_HOST;
257	}
258
259	return 0;
260}
261
262
263struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct nlattr *attrs[],
264				       const struct nlmsghdr *nlh, int *errp)
265{
266	int err;
267	struct dn_fib_info *fi = NULL;
268	struct dn_fib_info *ofi;
269	int nhs = 1;
270
271	if (r->rtm_type > RTN_MAX)
272		goto err_inval;
273
274	if (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
275		goto err_inval;
276
277	if (attrs[RTA_MULTIPATH] &&
278	    (nhs = dn_fib_count_nhs(attrs[RTA_MULTIPATH])) == 0)
279		goto err_inval;
280
281	fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
282	err = -ENOBUFS;
283	if (fi == NULL)
284		goto failure;
285
286	fi->fib_protocol = r->rtm_protocol;
287	fi->fib_nhs = nhs;
288	fi->fib_flags = r->rtm_flags;
289
290	if (attrs[RTA_PRIORITY])
291		fi->fib_priority = nla_get_u32(attrs[RTA_PRIORITY]);
292
293	if (attrs[RTA_METRICS]) {
294		struct nlattr *attr;
295		int rem;
296
297		nla_for_each_nested(attr, attrs[RTA_METRICS], rem) {
298			int type = nla_type(attr);
299
300			if (type) {
301				if (type > RTAX_MAX || nla_len(attr) < 4)
302					goto err_inval;
303
304				fi->fib_metrics[type-1] = nla_get_u32(attr);
305			}
306		}
307	}
308
309	if (attrs[RTA_PREFSRC])
310		fi->fib_prefsrc = nla_get_le16(attrs[RTA_PREFSRC]);
311
312	if (attrs[RTA_MULTIPATH]) {
313		if ((err = dn_fib_get_nhs(fi, attrs[RTA_MULTIPATH], r)) != 0)
314			goto failure;
315
316		if (attrs[RTA_OIF] &&
317		    fi->fib_nh->nh_oif != nla_get_u32(attrs[RTA_OIF]))
318			goto err_inval;
319
320		if (attrs[RTA_GATEWAY] &&
321		    fi->fib_nh->nh_gw != nla_get_le16(attrs[RTA_GATEWAY]))
322			goto err_inval;
323	} else {
324		struct dn_fib_nh *nh = fi->fib_nh;
325
326		if (attrs[RTA_OIF])
327			nh->nh_oif = nla_get_u32(attrs[RTA_OIF]);
328
329		if (attrs[RTA_GATEWAY])
330			nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]);
331
332		nh->nh_flags = r->rtm_flags;
333		nh->nh_weight = 1;
334	}
335
336	if (r->rtm_type == RTN_NAT) {
337		if (!attrs[RTA_GATEWAY] || nhs != 1 || attrs[RTA_OIF])
338			goto err_inval;
339
340		fi->fib_nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]);
341		goto link_it;
342	}
343
344	if (dn_fib_props[r->rtm_type].error) {
345		if (attrs[RTA_GATEWAY] || attrs[RTA_OIF] || attrs[RTA_MULTIPATH])
346			goto err_inval;
347
348		goto link_it;
349	}
350
351	if (r->rtm_scope > RT_SCOPE_HOST)
352		goto err_inval;
353
354	if (r->rtm_scope == RT_SCOPE_HOST) {
355		struct dn_fib_nh *nh = fi->fib_nh;
356
357		/* Local address is added */
358		if (nhs != 1 || nh->nh_gw)
359			goto err_inval;
360		nh->nh_scope = RT_SCOPE_NOWHERE;
361		nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif);
362		err = -ENODEV;
363		if (nh->nh_dev == NULL)
364			goto failure;
365	} else {
366		change_nexthops(fi) {
367			if ((err = dn_fib_check_nh(r, fi, nh)) != 0)
368				goto failure;
369		} endfor_nexthops(fi)
370	}
371
372	if (fi->fib_prefsrc) {
373		if (r->rtm_type != RTN_LOCAL || !attrs[RTA_DST] ||
374		    fi->fib_prefsrc != nla_get_le16(attrs[RTA_DST]))
375			if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
376				goto err_inval;
377	}
378
379link_it:
380	if ((ofi = dn_fib_find_info(fi)) != NULL) {
381		fi->fib_dead = 1;
382		dn_fib_free_info(fi);
383		ofi->fib_treeref++;
384		return ofi;
385	}
386
387	fi->fib_treeref++;
388	atomic_inc(&fi->fib_clntref);
389	spin_lock(&dn_fib_info_lock);
390	fi->fib_next = dn_fib_info_list;
391	fi->fib_prev = NULL;
392	if (dn_fib_info_list)
393		dn_fib_info_list->fib_prev = fi;
394	dn_fib_info_list = fi;
395	spin_unlock(&dn_fib_info_lock);
396	return fi;
397
398err_inval:
399	err = -EINVAL;
400
401failure:
402	*errp = err;
403	if (fi) {
404		fi->fib_dead = 1;
405		dn_fib_free_info(fi);
406	}
407
408	return NULL;
409}
410
411int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowidn *fld, struct dn_fib_res *res)
412{
413	int err = dn_fib_props[type].error;
414
415	if (err == 0) {
416		if (fi->fib_flags & RTNH_F_DEAD)
417			return 1;
418
419		res->fi = fi;
420
421		switch (type) {
422		case RTN_NAT:
423			DN_FIB_RES_RESET(*res);
424			atomic_inc(&fi->fib_clntref);
425			return 0;
426		case RTN_UNICAST:
427		case RTN_LOCAL:
428			for_nexthops(fi) {
429				if (nh->nh_flags & RTNH_F_DEAD)
430					continue;
431				if (!fld->flowidn_oif ||
432				    fld->flowidn_oif == nh->nh_oif)
433					break;
434			}
435			if (nhsel < fi->fib_nhs) {
436				res->nh_sel = nhsel;
437				atomic_inc(&fi->fib_clntref);
438				return 0;
439			}
440			endfor_nexthops(fi);
441			res->fi = NULL;
442			return 1;
443		default:
444			net_err_ratelimited("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n",
445					    type);
446			res->fi = NULL;
447			return -EINVAL;
448		}
449	}
450	return err;
451}
452
453void dn_fib_select_multipath(const struct flowidn *fld, struct dn_fib_res *res)
454{
455	struct dn_fib_info *fi = res->fi;
456	int w;
457
458	spin_lock_bh(&dn_fib_multipath_lock);
459	if (fi->fib_power <= 0) {
460		int power = 0;
461		change_nexthops(fi) {
462			if (!(nh->nh_flags&RTNH_F_DEAD)) {
463				power += nh->nh_weight;
464				nh->nh_power = nh->nh_weight;
465			}
466		} endfor_nexthops(fi);
467		fi->fib_power = power;
468		if (power < 0) {
469			spin_unlock_bh(&dn_fib_multipath_lock);
470			res->nh_sel = 0;
471			return;
472		}
473	}
474
475	w = jiffies % fi->fib_power;
476
477	change_nexthops(fi) {
478		if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
479			if ((w -= nh->nh_power) <= 0) {
480				nh->nh_power--;
481				fi->fib_power--;
482				res->nh_sel = nhsel;
483				spin_unlock_bh(&dn_fib_multipath_lock);
484				return;
485			}
486		}
487	} endfor_nexthops(fi);
488	res->nh_sel = 0;
489	spin_unlock_bh(&dn_fib_multipath_lock);
490}
491
492static inline u32 rtm_get_table(struct nlattr *attrs[], u8 table)
493{
494	if (attrs[RTA_TABLE])
495		table = nla_get_u32(attrs[RTA_TABLE]);
496
497	return table;
498}
499
500static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
501{
502	struct net *net = sock_net(skb->sk);
503	struct dn_fib_table *tb;
504	struct rtmsg *r = nlmsg_data(nlh);
505	struct nlattr *attrs[RTA_MAX+1];
506	int err;
507
508	if (!capable(CAP_NET_ADMIN))
509		return -EPERM;
510
511	if (!net_eq(net, &init_net))
512		return -EINVAL;
513
514	err = nlmsg_parse(nlh, sizeof(*r), attrs, RTA_MAX, rtm_dn_policy);
515	if (err < 0)
516		return err;
517
518	tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 0);
519	if (!tb)
520		return -ESRCH;
521
522	return tb->delete(tb, r, attrs, nlh, &NETLINK_CB(skb));
523}
524
525static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
526{
527	struct net *net = sock_net(skb->sk);
528	struct dn_fib_table *tb;
529	struct rtmsg *r = nlmsg_data(nlh);
530	struct nlattr *attrs[RTA_MAX+1];
531	int err;
532
533	if (!capable(CAP_NET_ADMIN))
534		return -EPERM;
535
536	if (!net_eq(net, &init_net))
537		return -EINVAL;
538
539	err = nlmsg_parse(nlh, sizeof(*r), attrs, RTA_MAX, rtm_dn_policy);
540	if (err < 0)
541		return err;
542
543	tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 1);
544	if (!tb)
545		return -ENOBUFS;
546
547	return tb->insert(tb, r, attrs, nlh, &NETLINK_CB(skb));
548}
549
550static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
551{
552	struct dn_fib_table *tb;
553	struct {
554		struct nlmsghdr nlh;
555		struct rtmsg rtm;
556	} req;
557	struct {
558		struct nlattr hdr;
559		__le16 dst;
560	} dst_attr = {
561		.dst = dst,
562	};
563	struct {
564		struct nlattr hdr;
565		__le16 prefsrc;
566	} prefsrc_attr = {
567		.prefsrc = ifa->ifa_local,
568	};
569	struct {
570		struct nlattr hdr;
571		u32 oif;
572	} oif_attr = {
573		.oif = ifa->ifa_dev->dev->ifindex,
574	};
575	struct nlattr *attrs[RTA_MAX+1] = {
576		[RTA_DST] = (struct nlattr *) &dst_attr,
577		[RTA_PREFSRC] = (struct nlattr * ) &prefsrc_attr,
578		[RTA_OIF] = (struct nlattr *) &oif_attr,
579	};
580
581	memset(&req.rtm, 0, sizeof(req.rtm));
582
583	if (type == RTN_UNICAST)
584		tb = dn_fib_get_table(RT_MIN_TABLE, 1);
585	else
586		tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
587
588	if (tb == NULL)
589		return;
590
591	req.nlh.nlmsg_len = sizeof(req);
592	req.nlh.nlmsg_type = cmd;
593	req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
594	req.nlh.nlmsg_pid = 0;
595	req.nlh.nlmsg_seq = 0;
596
597	req.rtm.rtm_dst_len = dst_len;
598	req.rtm.rtm_table = tb->n;
599	req.rtm.rtm_protocol = RTPROT_KERNEL;
600	req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
601	req.rtm.rtm_type = type;
602
603	if (cmd == RTM_NEWROUTE)
604		tb->insert(tb, &req.rtm, attrs, &req.nlh, NULL);
605	else
606		tb->delete(tb, &req.rtm, attrs, &req.nlh, NULL);
607}
608
609static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
610{
611
612	fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
613
614#if 0
615	if (!(dev->flags&IFF_UP))
616		return;
617	/* In the future, we will want to add default routes here */
618
619#endif
620}
621
622static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
623{
624	int found_it = 0;
625	struct net_device *dev;
626	struct dn_dev *dn_db;
627	struct dn_ifaddr *ifa2;
628
629	ASSERT_RTNL();
630
631	/* Scan device list */
632	rcu_read_lock();
633	for_each_netdev_rcu(&init_net, dev) {
634		dn_db = rcu_dereference(dev->dn_ptr);
635		if (dn_db == NULL)
636			continue;
637		for (ifa2 = rcu_dereference(dn_db->ifa_list);
638		     ifa2 != NULL;
639		     ifa2 = rcu_dereference(ifa2->ifa_next)) {
640			if (ifa2->ifa_local == ifa->ifa_local) {
641				found_it = 1;
642				break;
643			}
644		}
645	}
646	rcu_read_unlock();
647
648	if (found_it == 0) {
649		fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
650
651		if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
652			if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
653				dn_fib_flush();
654		}
655	}
656}
657
658static void dn_fib_disable_addr(struct net_device *dev, int force)
659{
660	if (dn_fib_sync_down(0, dev, force))
661		dn_fib_flush();
662	dn_rt_cache_flush(0);
663	neigh_ifdown(&dn_neigh_table, dev);
664}
665
666static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
667{
668	struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
669
670	switch (event) {
671	case NETDEV_UP:
672		dn_fib_add_ifaddr(ifa);
673		dn_fib_sync_up(ifa->ifa_dev->dev);
674		dn_rt_cache_flush(-1);
675		break;
676	case NETDEV_DOWN:
677		dn_fib_del_ifaddr(ifa);
678		if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
679			dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
680		} else {
681			dn_rt_cache_flush(-1);
682		}
683		break;
684	}
685	return NOTIFY_DONE;
686}
687
688static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force)
689{
690	int ret = 0;
691	int scope = RT_SCOPE_NOWHERE;
692
693	if (force)
694		scope = -1;
695
696	for_fib_info() {
697		/*
698		 * This makes no sense for DECnet.... we will almost
699		 * certainly have more than one local address the same
700		 * over all our interfaces. It needs thinking about
701		 * some more.
702		 */
703		if (local && fi->fib_prefsrc == local) {
704			fi->fib_flags |= RTNH_F_DEAD;
705			ret++;
706		} else if (dev && fi->fib_nhs) {
707			int dead = 0;
708
709			change_nexthops(fi) {
710				if (nh->nh_flags&RTNH_F_DEAD)
711					dead++;
712				else if (nh->nh_dev == dev &&
713						nh->nh_scope != scope) {
714					spin_lock_bh(&dn_fib_multipath_lock);
715					nh->nh_flags |= RTNH_F_DEAD;
716					fi->fib_power -= nh->nh_power;
717					nh->nh_power = 0;
718					spin_unlock_bh(&dn_fib_multipath_lock);
719					dead++;
720				}
721			} endfor_nexthops(fi)
722			if (dead == fi->fib_nhs) {
723				fi->fib_flags |= RTNH_F_DEAD;
724				ret++;
725			}
726		}
727	} endfor_fib_info();
728	return ret;
729}
730
731
732static int dn_fib_sync_up(struct net_device *dev)
733{
734	int ret = 0;
735
736	if (!(dev->flags&IFF_UP))
737		return 0;
738
739	for_fib_info() {
740		int alive = 0;
741
742		change_nexthops(fi) {
743			if (!(nh->nh_flags&RTNH_F_DEAD)) {
744				alive++;
745				continue;
746			}
747			if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
748				continue;
749			if (nh->nh_dev != dev || dev->dn_ptr == NULL)
750				continue;
751			alive++;
752			spin_lock_bh(&dn_fib_multipath_lock);
753			nh->nh_power = 0;
754			nh->nh_flags &= ~RTNH_F_DEAD;
755			spin_unlock_bh(&dn_fib_multipath_lock);
756		} endfor_nexthops(fi);
757
758		if (alive > 0) {
759			fi->fib_flags &= ~RTNH_F_DEAD;
760			ret++;
761		}
762	} endfor_fib_info();
763	return ret;
764}
765
766static struct notifier_block dn_fib_dnaddr_notifier = {
767	.notifier_call = dn_fib_dnaddr_event,
768};
769
770void __exit dn_fib_cleanup(void)
771{
772	dn_fib_table_cleanup();
773	dn_fib_rules_cleanup();
774
775	unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
776}
777
778
779void __init dn_fib_init(void)
780{
781	dn_fib_table_init();
782	dn_fib_rules_init();
783
784	register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
785
786	rtnl_register(PF_DECnet, RTM_NEWROUTE, dn_fib_rtm_newroute, NULL, NULL);
787	rtnl_register(PF_DECnet, RTM_DELROUTE, dn_fib_rtm_delroute, NULL, NULL);
788}
789
790
791