xref: /openbmc/linux/net/ipv6/route.c (revision d2999e1b)
1 /*
2  *	Linux INET6 implementation
3  *	FIB front-end.
4  *
5  *	Authors:
6  *	Pedro Roque		<roque@di.fc.ul.pt>
7  *
8  *	This program is free software; you can redistribute it and/or
9  *      modify it under the terms of the GNU General Public License
10  *      as published by the Free Software Foundation; either version
11  *      2 of the License, or (at your option) any later version.
12  */
13 
14 /*	Changes:
15  *
16  *	YOSHIFUJI Hideaki @USAGI
17  *		reworked default router selection.
18  *		- respect outgoing interface
19  *		- select from (probably) reachable routers (i.e.
20  *		routers in REACHABLE, STALE, DELAY or PROBE states).
21  *		- always select the same router if it is (probably)
22  *		reachable.  otherwise, round-robin the list.
23  *	Ville Nuorvala
24  *		Fixed routing subtrees.
25  */
26 
27 #define pr_fmt(fmt) "IPv6: " fmt
28 
29 #include <linux/capability.h>
30 #include <linux/errno.h>
31 #include <linux/export.h>
32 #include <linux/types.h>
33 #include <linux/times.h>
34 #include <linux/socket.h>
35 #include <linux/sockios.h>
36 #include <linux/net.h>
37 #include <linux/route.h>
38 #include <linux/netdevice.h>
39 #include <linux/in6.h>
40 #include <linux/mroute6.h>
41 #include <linux/init.h>
42 #include <linux/if_arp.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/nsproxy.h>
46 #include <linux/slab.h>
47 #include <net/net_namespace.h>
48 #include <net/snmp.h>
49 #include <net/ipv6.h>
50 #include <net/ip6_fib.h>
51 #include <net/ip6_route.h>
52 #include <net/ndisc.h>
53 #include <net/addrconf.h>
54 #include <net/tcp.h>
55 #include <linux/rtnetlink.h>
56 #include <net/dst.h>
57 #include <net/xfrm.h>
58 #include <net/netevent.h>
59 #include <net/netlink.h>
60 #include <net/nexthop.h>
61 
62 #include <asm/uaccess.h>
63 
64 #ifdef CONFIG_SYSCTL
65 #include <linux/sysctl.h>
66 #endif
67 
68 enum rt6_nud_state {
69 	RT6_NUD_FAIL_HARD = -3,
70 	RT6_NUD_FAIL_PROBE = -2,
71 	RT6_NUD_FAIL_DO_RR = -1,
72 	RT6_NUD_SUCCEED = 1
73 };
74 
75 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
76 				    const struct in6_addr *dest);
77 static struct dst_entry	*ip6_dst_check(struct dst_entry *dst, u32 cookie);
78 static unsigned int	 ip6_default_advmss(const struct dst_entry *dst);
79 static unsigned int	 ip6_mtu(const struct dst_entry *dst);
80 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
81 static void		ip6_dst_destroy(struct dst_entry *);
82 static void		ip6_dst_ifdown(struct dst_entry *,
83 				       struct net_device *dev, int how);
84 static int		 ip6_dst_gc(struct dst_ops *ops);
85 
86 static int		ip6_pkt_discard(struct sk_buff *skb);
87 static int		ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb);
88 static int		ip6_pkt_prohibit(struct sk_buff *skb);
89 static int		ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb);
90 static void		ip6_link_failure(struct sk_buff *skb);
91 static void		ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
92 					   struct sk_buff *skb, u32 mtu);
93 static void		rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
94 					struct sk_buff *skb);
95 static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
96 
97 #ifdef CONFIG_IPV6_ROUTE_INFO
98 static struct rt6_info *rt6_add_route_info(struct net *net,
99 					   const struct in6_addr *prefix, int prefixlen,
100 					   const struct in6_addr *gwaddr, int ifindex,
101 					   unsigned int pref);
102 static struct rt6_info *rt6_get_route_info(struct net *net,
103 					   const struct in6_addr *prefix, int prefixlen,
104 					   const struct in6_addr *gwaddr, int ifindex);
105 #endif
106 
107 static void rt6_bind_peer(struct rt6_info *rt, int create)
108 {
109 	struct inet_peer_base *base;
110 	struct inet_peer *peer;
111 
112 	base = inetpeer_base_ptr(rt->_rt6i_peer);
113 	if (!base)
114 		return;
115 
116 	peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create);
117 	if (peer) {
118 		if (!rt6_set_peer(rt, peer))
119 			inet_putpeer(peer);
120 	}
121 }
122 
123 static struct inet_peer *__rt6_get_peer(struct rt6_info *rt, int create)
124 {
125 	if (rt6_has_peer(rt))
126 		return rt6_peer_ptr(rt);
127 
128 	rt6_bind_peer(rt, create);
129 	return (rt6_has_peer(rt) ? rt6_peer_ptr(rt) : NULL);
130 }
131 
132 static struct inet_peer *rt6_get_peer_create(struct rt6_info *rt)
133 {
134 	return __rt6_get_peer(rt, 1);
135 }
136 
137 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
138 {
139 	struct rt6_info *rt = (struct rt6_info *) dst;
140 	struct inet_peer *peer;
141 	u32 *p = NULL;
142 
143 	if (!(rt->dst.flags & DST_HOST))
144 		return NULL;
145 
146 	peer = rt6_get_peer_create(rt);
147 	if (peer) {
148 		u32 *old_p = __DST_METRICS_PTR(old);
149 		unsigned long prev, new;
150 
151 		p = peer->metrics;
152 		if (inet_metrics_new(peer) ||
153 		    (old & DST_METRICS_FORCE_OVERWRITE))
154 			memcpy(p, old_p, sizeof(u32) * RTAX_MAX);
155 
156 		new = (unsigned long) p;
157 		prev = cmpxchg(&dst->_metrics, old, new);
158 
159 		if (prev != old) {
160 			p = __DST_METRICS_PTR(prev);
161 			if (prev & DST_METRICS_READ_ONLY)
162 				p = NULL;
163 		}
164 	}
165 	return p;
166 }
167 
168 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
169 					     struct sk_buff *skb,
170 					     const void *daddr)
171 {
172 	struct in6_addr *p = &rt->rt6i_gateway;
173 
174 	if (!ipv6_addr_any(p))
175 		return (const void *) p;
176 	else if (skb)
177 		return &ipv6_hdr(skb)->daddr;
178 	return daddr;
179 }
180 
181 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
182 					  struct sk_buff *skb,
183 					  const void *daddr)
184 {
185 	struct rt6_info *rt = (struct rt6_info *) dst;
186 	struct neighbour *n;
187 
188 	daddr = choose_neigh_daddr(rt, skb, daddr);
189 	n = __ipv6_neigh_lookup(dst->dev, daddr);
190 	if (n)
191 		return n;
192 	return neigh_create(&nd_tbl, daddr, dst->dev);
193 }
194 
195 static struct dst_ops ip6_dst_ops_template = {
196 	.family			=	AF_INET6,
197 	.protocol		=	cpu_to_be16(ETH_P_IPV6),
198 	.gc			=	ip6_dst_gc,
199 	.gc_thresh		=	1024,
200 	.check			=	ip6_dst_check,
201 	.default_advmss		=	ip6_default_advmss,
202 	.mtu			=	ip6_mtu,
203 	.cow_metrics		=	ipv6_cow_metrics,
204 	.destroy		=	ip6_dst_destroy,
205 	.ifdown			=	ip6_dst_ifdown,
206 	.negative_advice	=	ip6_negative_advice,
207 	.link_failure		=	ip6_link_failure,
208 	.update_pmtu		=	ip6_rt_update_pmtu,
209 	.redirect		=	rt6_do_redirect,
210 	.local_out		=	__ip6_local_out,
211 	.neigh_lookup		=	ip6_neigh_lookup,
212 };
213 
214 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
215 {
216 	unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
217 
218 	return mtu ? : dst->dev->mtu;
219 }
220 
221 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
222 					 struct sk_buff *skb, u32 mtu)
223 {
224 }
225 
226 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
227 				      struct sk_buff *skb)
228 {
229 }
230 
231 static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst,
232 					 unsigned long old)
233 {
234 	return NULL;
235 }
236 
237 static struct dst_ops ip6_dst_blackhole_ops = {
238 	.family			=	AF_INET6,
239 	.protocol		=	cpu_to_be16(ETH_P_IPV6),
240 	.destroy		=	ip6_dst_destroy,
241 	.check			=	ip6_dst_check,
242 	.mtu			=	ip6_blackhole_mtu,
243 	.default_advmss		=	ip6_default_advmss,
244 	.update_pmtu		=	ip6_rt_blackhole_update_pmtu,
245 	.redirect		=	ip6_rt_blackhole_redirect,
246 	.cow_metrics		=	ip6_rt_blackhole_cow_metrics,
247 	.neigh_lookup		=	ip6_neigh_lookup,
248 };
249 
250 static const u32 ip6_template_metrics[RTAX_MAX] = {
251 	[RTAX_HOPLIMIT - 1] = 0,
252 };
253 
254 static const struct rt6_info ip6_null_entry_template = {
255 	.dst = {
256 		.__refcnt	= ATOMIC_INIT(1),
257 		.__use		= 1,
258 		.obsolete	= DST_OBSOLETE_FORCE_CHK,
259 		.error		= -ENETUNREACH,
260 		.input		= ip6_pkt_discard,
261 		.output		= ip6_pkt_discard_out,
262 	},
263 	.rt6i_flags	= (RTF_REJECT | RTF_NONEXTHOP),
264 	.rt6i_protocol  = RTPROT_KERNEL,
265 	.rt6i_metric	= ~(u32) 0,
266 	.rt6i_ref	= ATOMIC_INIT(1),
267 };
268 
269 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
270 
271 static const struct rt6_info ip6_prohibit_entry_template = {
272 	.dst = {
273 		.__refcnt	= ATOMIC_INIT(1),
274 		.__use		= 1,
275 		.obsolete	= DST_OBSOLETE_FORCE_CHK,
276 		.error		= -EACCES,
277 		.input		= ip6_pkt_prohibit,
278 		.output		= ip6_pkt_prohibit_out,
279 	},
280 	.rt6i_flags	= (RTF_REJECT | RTF_NONEXTHOP),
281 	.rt6i_protocol  = RTPROT_KERNEL,
282 	.rt6i_metric	= ~(u32) 0,
283 	.rt6i_ref	= ATOMIC_INIT(1),
284 };
285 
286 static const struct rt6_info ip6_blk_hole_entry_template = {
287 	.dst = {
288 		.__refcnt	= ATOMIC_INIT(1),
289 		.__use		= 1,
290 		.obsolete	= DST_OBSOLETE_FORCE_CHK,
291 		.error		= -EINVAL,
292 		.input		= dst_discard,
293 		.output		= dst_discard_sk,
294 	},
295 	.rt6i_flags	= (RTF_REJECT | RTF_NONEXTHOP),
296 	.rt6i_protocol  = RTPROT_KERNEL,
297 	.rt6i_metric	= ~(u32) 0,
298 	.rt6i_ref	= ATOMIC_INIT(1),
299 };
300 
301 #endif
302 
303 /* allocate dst with ip6_dst_ops */
304 static inline struct rt6_info *ip6_dst_alloc(struct net *net,
305 					     struct net_device *dev,
306 					     int flags,
307 					     struct fib6_table *table)
308 {
309 	struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
310 					0, DST_OBSOLETE_FORCE_CHK, flags);
311 
312 	if (rt) {
313 		struct dst_entry *dst = &rt->dst;
314 
315 		memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
316 		rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers);
317 		rt->rt6i_genid = rt_genid_ipv6(net);
318 		INIT_LIST_HEAD(&rt->rt6i_siblings);
319 	}
320 	return rt;
321 }
322 
323 static void ip6_dst_destroy(struct dst_entry *dst)
324 {
325 	struct rt6_info *rt = (struct rt6_info *)dst;
326 	struct inet6_dev *idev = rt->rt6i_idev;
327 	struct dst_entry *from = dst->from;
328 
329 	if (!(rt->dst.flags & DST_HOST))
330 		dst_destroy_metrics_generic(dst);
331 
332 	if (idev) {
333 		rt->rt6i_idev = NULL;
334 		in6_dev_put(idev);
335 	}
336 
337 	dst->from = NULL;
338 	dst_release(from);
339 
340 	if (rt6_has_peer(rt)) {
341 		struct inet_peer *peer = rt6_peer_ptr(rt);
342 		inet_putpeer(peer);
343 	}
344 }
345 
346 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
347 			   int how)
348 {
349 	struct rt6_info *rt = (struct rt6_info *)dst;
350 	struct inet6_dev *idev = rt->rt6i_idev;
351 	struct net_device *loopback_dev =
352 		dev_net(dev)->loopback_dev;
353 
354 	if (dev != loopback_dev) {
355 		if (idev && idev->dev == dev) {
356 			struct inet6_dev *loopback_idev =
357 				in6_dev_get(loopback_dev);
358 			if (loopback_idev) {
359 				rt->rt6i_idev = loopback_idev;
360 				in6_dev_put(idev);
361 			}
362 		}
363 	}
364 }
365 
366 static bool rt6_check_expired(const struct rt6_info *rt)
367 {
368 	if (rt->rt6i_flags & RTF_EXPIRES) {
369 		if (time_after(jiffies, rt->dst.expires))
370 			return true;
371 	} else if (rt->dst.from) {
372 		return rt6_check_expired((struct rt6_info *) rt->dst.from);
373 	}
374 	return false;
375 }
376 
377 /* Multipath route selection:
378  *   Hash based function using packet header and flowlabel.
379  * Adapted from fib_info_hashfn()
380  */
381 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
382 			       const struct flowi6 *fl6)
383 {
384 	unsigned int val = fl6->flowi6_proto;
385 
386 	val ^= ipv6_addr_hash(&fl6->daddr);
387 	val ^= ipv6_addr_hash(&fl6->saddr);
388 
389 	/* Work only if this not encapsulated */
390 	switch (fl6->flowi6_proto) {
391 	case IPPROTO_UDP:
392 	case IPPROTO_TCP:
393 	case IPPROTO_SCTP:
394 		val ^= (__force u16)fl6->fl6_sport;
395 		val ^= (__force u16)fl6->fl6_dport;
396 		break;
397 
398 	case IPPROTO_ICMPV6:
399 		val ^= (__force u16)fl6->fl6_icmp_type;
400 		val ^= (__force u16)fl6->fl6_icmp_code;
401 		break;
402 	}
403 	/* RFC6438 recommands to use flowlabel */
404 	val ^= (__force u32)fl6->flowlabel;
405 
406 	/* Perhaps, we need to tune, this function? */
407 	val = val ^ (val >> 7) ^ (val >> 12);
408 	return val % candidate_count;
409 }
410 
411 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
412 					     struct flowi6 *fl6, int oif,
413 					     int strict)
414 {
415 	struct rt6_info *sibling, *next_sibling;
416 	int route_choosen;
417 
418 	route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
419 	/* Don't change the route, if route_choosen == 0
420 	 * (siblings does not include ourself)
421 	 */
422 	if (route_choosen)
423 		list_for_each_entry_safe(sibling, next_sibling,
424 				&match->rt6i_siblings, rt6i_siblings) {
425 			route_choosen--;
426 			if (route_choosen == 0) {
427 				if (rt6_score_route(sibling, oif, strict) < 0)
428 					break;
429 				match = sibling;
430 				break;
431 			}
432 		}
433 	return match;
434 }
435 
436 /*
437  *	Route lookup. Any table->tb6_lock is implied.
438  */
439 
440 static inline struct rt6_info *rt6_device_match(struct net *net,
441 						    struct rt6_info *rt,
442 						    const struct in6_addr *saddr,
443 						    int oif,
444 						    int flags)
445 {
446 	struct rt6_info *local = NULL;
447 	struct rt6_info *sprt;
448 
449 	if (!oif && ipv6_addr_any(saddr))
450 		goto out;
451 
452 	for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
453 		struct net_device *dev = sprt->dst.dev;
454 
455 		if (oif) {
456 			if (dev->ifindex == oif)
457 				return sprt;
458 			if (dev->flags & IFF_LOOPBACK) {
459 				if (!sprt->rt6i_idev ||
460 				    sprt->rt6i_idev->dev->ifindex != oif) {
461 					if (flags & RT6_LOOKUP_F_IFACE && oif)
462 						continue;
463 					if (local && (!oif ||
464 						      local->rt6i_idev->dev->ifindex == oif))
465 						continue;
466 				}
467 				local = sprt;
468 			}
469 		} else {
470 			if (ipv6_chk_addr(net, saddr, dev,
471 					  flags & RT6_LOOKUP_F_IFACE))
472 				return sprt;
473 		}
474 	}
475 
476 	if (oif) {
477 		if (local)
478 			return local;
479 
480 		if (flags & RT6_LOOKUP_F_IFACE)
481 			return net->ipv6.ip6_null_entry;
482 	}
483 out:
484 	return rt;
485 }
486 
487 #ifdef CONFIG_IPV6_ROUTER_PREF
488 struct __rt6_probe_work {
489 	struct work_struct work;
490 	struct in6_addr target;
491 	struct net_device *dev;
492 };
493 
494 static void rt6_probe_deferred(struct work_struct *w)
495 {
496 	struct in6_addr mcaddr;
497 	struct __rt6_probe_work *work =
498 		container_of(w, struct __rt6_probe_work, work);
499 
500 	addrconf_addr_solict_mult(&work->target, &mcaddr);
501 	ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL);
502 	dev_put(work->dev);
503 	kfree(w);
504 }
505 
506 static void rt6_probe(struct rt6_info *rt)
507 {
508 	struct neighbour *neigh;
509 	/*
510 	 * Okay, this does not seem to be appropriate
511 	 * for now, however, we need to check if it
512 	 * is really so; aka Router Reachability Probing.
513 	 *
514 	 * Router Reachability Probe MUST be rate-limited
515 	 * to no more than one per minute.
516 	 */
517 	if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
518 		return;
519 	rcu_read_lock_bh();
520 	neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
521 	if (neigh) {
522 		write_lock(&neigh->lock);
523 		if (neigh->nud_state & NUD_VALID)
524 			goto out;
525 	}
526 
527 	if (!neigh ||
528 	    time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
529 		struct __rt6_probe_work *work;
530 
531 		work = kmalloc(sizeof(*work), GFP_ATOMIC);
532 
533 		if (neigh && work)
534 			__neigh_set_probe_once(neigh);
535 
536 		if (neigh)
537 			write_unlock(&neigh->lock);
538 
539 		if (work) {
540 			INIT_WORK(&work->work, rt6_probe_deferred);
541 			work->target = rt->rt6i_gateway;
542 			dev_hold(rt->dst.dev);
543 			work->dev = rt->dst.dev;
544 			schedule_work(&work->work);
545 		}
546 	} else {
547 out:
548 		write_unlock(&neigh->lock);
549 	}
550 	rcu_read_unlock_bh();
551 }
552 #else
553 static inline void rt6_probe(struct rt6_info *rt)
554 {
555 }
556 #endif
557 
558 /*
559  * Default Router Selection (RFC 2461 6.3.6)
560  */
561 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
562 {
563 	struct net_device *dev = rt->dst.dev;
564 	if (!oif || dev->ifindex == oif)
565 		return 2;
566 	if ((dev->flags & IFF_LOOPBACK) &&
567 	    rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
568 		return 1;
569 	return 0;
570 }
571 
572 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
573 {
574 	struct neighbour *neigh;
575 	enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
576 
577 	if (rt->rt6i_flags & RTF_NONEXTHOP ||
578 	    !(rt->rt6i_flags & RTF_GATEWAY))
579 		return RT6_NUD_SUCCEED;
580 
581 	rcu_read_lock_bh();
582 	neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
583 	if (neigh) {
584 		read_lock(&neigh->lock);
585 		if (neigh->nud_state & NUD_VALID)
586 			ret = RT6_NUD_SUCCEED;
587 #ifdef CONFIG_IPV6_ROUTER_PREF
588 		else if (!(neigh->nud_state & NUD_FAILED))
589 			ret = RT6_NUD_SUCCEED;
590 		else
591 			ret = RT6_NUD_FAIL_PROBE;
592 #endif
593 		read_unlock(&neigh->lock);
594 	} else {
595 		ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
596 		      RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
597 	}
598 	rcu_read_unlock_bh();
599 
600 	return ret;
601 }
602 
603 static int rt6_score_route(struct rt6_info *rt, int oif,
604 			   int strict)
605 {
606 	int m;
607 
608 	m = rt6_check_dev(rt, oif);
609 	if (!m && (strict & RT6_LOOKUP_F_IFACE))
610 		return RT6_NUD_FAIL_HARD;
611 #ifdef CONFIG_IPV6_ROUTER_PREF
612 	m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
613 #endif
614 	if (strict & RT6_LOOKUP_F_REACHABLE) {
615 		int n = rt6_check_neigh(rt);
616 		if (n < 0)
617 			return n;
618 	}
619 	return m;
620 }
621 
622 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
623 				   int *mpri, struct rt6_info *match,
624 				   bool *do_rr)
625 {
626 	int m;
627 	bool match_do_rr = false;
628 
629 	if (rt6_check_expired(rt))
630 		goto out;
631 
632 	m = rt6_score_route(rt, oif, strict);
633 	if (m == RT6_NUD_FAIL_DO_RR) {
634 		match_do_rr = true;
635 		m = 0; /* lowest valid score */
636 	} else if (m == RT6_NUD_FAIL_HARD) {
637 		goto out;
638 	}
639 
640 	if (strict & RT6_LOOKUP_F_REACHABLE)
641 		rt6_probe(rt);
642 
643 	/* note that m can be RT6_NUD_FAIL_PROBE at this point */
644 	if (m > *mpri) {
645 		*do_rr = match_do_rr;
646 		*mpri = m;
647 		match = rt;
648 	}
649 out:
650 	return match;
651 }
652 
653 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
654 				     struct rt6_info *rr_head,
655 				     u32 metric, int oif, int strict,
656 				     bool *do_rr)
657 {
658 	struct rt6_info *rt, *match;
659 	int mpri = -1;
660 
661 	match = NULL;
662 	for (rt = rr_head; rt && rt->rt6i_metric == metric;
663 	     rt = rt->dst.rt6_next)
664 		match = find_match(rt, oif, strict, &mpri, match, do_rr);
665 	for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
666 	     rt = rt->dst.rt6_next)
667 		match = find_match(rt, oif, strict, &mpri, match, do_rr);
668 
669 	return match;
670 }
671 
672 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
673 {
674 	struct rt6_info *match, *rt0;
675 	struct net *net;
676 	bool do_rr = false;
677 
678 	rt0 = fn->rr_ptr;
679 	if (!rt0)
680 		fn->rr_ptr = rt0 = fn->leaf;
681 
682 	match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
683 			     &do_rr);
684 
685 	if (do_rr) {
686 		struct rt6_info *next = rt0->dst.rt6_next;
687 
688 		/* no entries matched; do round-robin */
689 		if (!next || next->rt6i_metric != rt0->rt6i_metric)
690 			next = fn->leaf;
691 
692 		if (next != rt0)
693 			fn->rr_ptr = next;
694 	}
695 
696 	net = dev_net(rt0->dst.dev);
697 	return match ? match : net->ipv6.ip6_null_entry;
698 }
699 
700 #ifdef CONFIG_IPV6_ROUTE_INFO
701 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
702 		  const struct in6_addr *gwaddr)
703 {
704 	struct net *net = dev_net(dev);
705 	struct route_info *rinfo = (struct route_info *) opt;
706 	struct in6_addr prefix_buf, *prefix;
707 	unsigned int pref;
708 	unsigned long lifetime;
709 	struct rt6_info *rt;
710 
711 	if (len < sizeof(struct route_info)) {
712 		return -EINVAL;
713 	}
714 
715 	/* Sanity check for prefix_len and length */
716 	if (rinfo->length > 3) {
717 		return -EINVAL;
718 	} else if (rinfo->prefix_len > 128) {
719 		return -EINVAL;
720 	} else if (rinfo->prefix_len > 64) {
721 		if (rinfo->length < 2) {
722 			return -EINVAL;
723 		}
724 	} else if (rinfo->prefix_len > 0) {
725 		if (rinfo->length < 1) {
726 			return -EINVAL;
727 		}
728 	}
729 
730 	pref = rinfo->route_pref;
731 	if (pref == ICMPV6_ROUTER_PREF_INVALID)
732 		return -EINVAL;
733 
734 	lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
735 
736 	if (rinfo->length == 3)
737 		prefix = (struct in6_addr *)rinfo->prefix;
738 	else {
739 		/* this function is safe */
740 		ipv6_addr_prefix(&prefix_buf,
741 				 (struct in6_addr *)rinfo->prefix,
742 				 rinfo->prefix_len);
743 		prefix = &prefix_buf;
744 	}
745 
746 	if (rinfo->prefix_len == 0)
747 		rt = rt6_get_dflt_router(gwaddr, dev);
748 	else
749 		rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
750 					gwaddr, dev->ifindex);
751 
752 	if (rt && !lifetime) {
753 		ip6_del_rt(rt);
754 		rt = NULL;
755 	}
756 
757 	if (!rt && lifetime)
758 		rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
759 					pref);
760 	else if (rt)
761 		rt->rt6i_flags = RTF_ROUTEINFO |
762 				 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
763 
764 	if (rt) {
765 		if (!addrconf_finite_timeout(lifetime))
766 			rt6_clean_expires(rt);
767 		else
768 			rt6_set_expires(rt, jiffies + HZ * lifetime);
769 
770 		ip6_rt_put(rt);
771 	}
772 	return 0;
773 }
774 #endif
775 
776 #define BACKTRACK(__net, saddr)			\
777 do { \
778 	if (rt == __net->ipv6.ip6_null_entry) {	\
779 		struct fib6_node *pn; \
780 		while (1) { \
781 			if (fn->fn_flags & RTN_TL_ROOT) \
782 				goto out; \
783 			pn = fn->parent; \
784 			if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
785 				fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
786 			else \
787 				fn = pn; \
788 			if (fn->fn_flags & RTN_RTINFO) \
789 				goto restart; \
790 		} \
791 	} \
792 } while (0)
793 
794 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
795 					     struct fib6_table *table,
796 					     struct flowi6 *fl6, int flags)
797 {
798 	struct fib6_node *fn;
799 	struct rt6_info *rt;
800 
801 	read_lock_bh(&table->tb6_lock);
802 	fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
803 restart:
804 	rt = fn->leaf;
805 	rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
806 	if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
807 		rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
808 	BACKTRACK(net, &fl6->saddr);
809 out:
810 	dst_use(&rt->dst, jiffies);
811 	read_unlock_bh(&table->tb6_lock);
812 	return rt;
813 
814 }
815 
816 struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6,
817 				    int flags)
818 {
819 	return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
820 }
821 EXPORT_SYMBOL_GPL(ip6_route_lookup);
822 
823 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
824 			    const struct in6_addr *saddr, int oif, int strict)
825 {
826 	struct flowi6 fl6 = {
827 		.flowi6_oif = oif,
828 		.daddr = *daddr,
829 	};
830 	struct dst_entry *dst;
831 	int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
832 
833 	if (saddr) {
834 		memcpy(&fl6.saddr, saddr, sizeof(*saddr));
835 		flags |= RT6_LOOKUP_F_HAS_SADDR;
836 	}
837 
838 	dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
839 	if (dst->error == 0)
840 		return (struct rt6_info *) dst;
841 
842 	dst_release(dst);
843 
844 	return NULL;
845 }
846 
847 EXPORT_SYMBOL(rt6_lookup);
848 
849 /* ip6_ins_rt is called with FREE table->tb6_lock.
850    It takes new route entry, the addition fails by any reason the
851    route is freed. In any case, if caller does not hold it, it may
852    be destroyed.
853  */
854 
855 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
856 			struct nlattr *mx, int mx_len)
857 {
858 	int err;
859 	struct fib6_table *table;
860 
861 	table = rt->rt6i_table;
862 	write_lock_bh(&table->tb6_lock);
863 	err = fib6_add(&table->tb6_root, rt, info, mx, mx_len);
864 	write_unlock_bh(&table->tb6_lock);
865 
866 	return err;
867 }
868 
869 int ip6_ins_rt(struct rt6_info *rt)
870 {
871 	struct nl_info info = {
872 		.nl_net = dev_net(rt->dst.dev),
873 	};
874 	return __ip6_ins_rt(rt, &info, NULL, 0);
875 }
876 
877 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
878 				      const struct in6_addr *daddr,
879 				      const struct in6_addr *saddr)
880 {
881 	struct rt6_info *rt;
882 
883 	/*
884 	 *	Clone the route.
885 	 */
886 
887 	rt = ip6_rt_copy(ort, daddr);
888 
889 	if (rt) {
890 		if (ort->rt6i_dst.plen != 128 &&
891 		    ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
892 			rt->rt6i_flags |= RTF_ANYCAST;
893 
894 		rt->rt6i_flags |= RTF_CACHE;
895 
896 #ifdef CONFIG_IPV6_SUBTREES
897 		if (rt->rt6i_src.plen && saddr) {
898 			rt->rt6i_src.addr = *saddr;
899 			rt->rt6i_src.plen = 128;
900 		}
901 #endif
902 	}
903 
904 	return rt;
905 }
906 
907 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
908 					const struct in6_addr *daddr)
909 {
910 	struct rt6_info *rt = ip6_rt_copy(ort, daddr);
911 
912 	if (rt)
913 		rt->rt6i_flags |= RTF_CACHE;
914 	return rt;
915 }
916 
917 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
918 				      struct flowi6 *fl6, int flags)
919 {
920 	struct fib6_node *fn;
921 	struct rt6_info *rt, *nrt;
922 	int strict = 0;
923 	int attempts = 3;
924 	int err;
925 	int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
926 
927 	strict |= flags & RT6_LOOKUP_F_IFACE;
928 
929 relookup:
930 	read_lock_bh(&table->tb6_lock);
931 
932 restart_2:
933 	fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
934 
935 restart:
936 	rt = rt6_select(fn, oif, strict | reachable);
937 	if (rt->rt6i_nsiblings)
938 		rt = rt6_multipath_select(rt, fl6, oif, strict | reachable);
939 	BACKTRACK(net, &fl6->saddr);
940 	if (rt == net->ipv6.ip6_null_entry ||
941 	    rt->rt6i_flags & RTF_CACHE)
942 		goto out;
943 
944 	dst_hold(&rt->dst);
945 	read_unlock_bh(&table->tb6_lock);
946 
947 	if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
948 		nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
949 	else if (!(rt->dst.flags & DST_HOST))
950 		nrt = rt6_alloc_clone(rt, &fl6->daddr);
951 	else
952 		goto out2;
953 
954 	ip6_rt_put(rt);
955 	rt = nrt ? : net->ipv6.ip6_null_entry;
956 
957 	dst_hold(&rt->dst);
958 	if (nrt) {
959 		err = ip6_ins_rt(nrt);
960 		if (!err)
961 			goto out2;
962 	}
963 
964 	if (--attempts <= 0)
965 		goto out2;
966 
967 	/*
968 	 * Race condition! In the gap, when table->tb6_lock was
969 	 * released someone could insert this route.  Relookup.
970 	 */
971 	ip6_rt_put(rt);
972 	goto relookup;
973 
974 out:
975 	if (reachable) {
976 		reachable = 0;
977 		goto restart_2;
978 	}
979 	dst_hold(&rt->dst);
980 	read_unlock_bh(&table->tb6_lock);
981 out2:
982 	rt->dst.lastuse = jiffies;
983 	rt->dst.__use++;
984 
985 	return rt;
986 }
987 
988 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
989 					    struct flowi6 *fl6, int flags)
990 {
991 	return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
992 }
993 
994 static struct dst_entry *ip6_route_input_lookup(struct net *net,
995 						struct net_device *dev,
996 						struct flowi6 *fl6, int flags)
997 {
998 	if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
999 		flags |= RT6_LOOKUP_F_IFACE;
1000 
1001 	return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1002 }
1003 
1004 void ip6_route_input(struct sk_buff *skb)
1005 {
1006 	const struct ipv6hdr *iph = ipv6_hdr(skb);
1007 	struct net *net = dev_net(skb->dev);
1008 	int flags = RT6_LOOKUP_F_HAS_SADDR;
1009 	struct flowi6 fl6 = {
1010 		.flowi6_iif = skb->dev->ifindex,
1011 		.daddr = iph->daddr,
1012 		.saddr = iph->saddr,
1013 		.flowlabel = ip6_flowinfo(iph),
1014 		.flowi6_mark = skb->mark,
1015 		.flowi6_proto = iph->nexthdr,
1016 	};
1017 
1018 	skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1019 }
1020 
1021 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1022 					     struct flowi6 *fl6, int flags)
1023 {
1024 	return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1025 }
1026 
1027 struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk,
1028 				    struct flowi6 *fl6)
1029 {
1030 	int flags = 0;
1031 
1032 	fl6->flowi6_iif = LOOPBACK_IFINDEX;
1033 
1034 	if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
1035 		flags |= RT6_LOOKUP_F_IFACE;
1036 
1037 	if (!ipv6_addr_any(&fl6->saddr))
1038 		flags |= RT6_LOOKUP_F_HAS_SADDR;
1039 	else if (sk)
1040 		flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1041 
1042 	return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1043 }
1044 
1045 EXPORT_SYMBOL(ip6_route_output);
1046 
1047 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1048 {
1049 	struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1050 	struct dst_entry *new = NULL;
1051 
1052 	rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1053 	if (rt) {
1054 		new = &rt->dst;
1055 
1056 		memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
1057 		rt6_init_peer(rt, net->ipv6.peers);
1058 
1059 		new->__use = 1;
1060 		new->input = dst_discard;
1061 		new->output = dst_discard_sk;
1062 
1063 		if (dst_metrics_read_only(&ort->dst))
1064 			new->_metrics = ort->dst._metrics;
1065 		else
1066 			dst_copy_metrics(new, &ort->dst);
1067 		rt->rt6i_idev = ort->rt6i_idev;
1068 		if (rt->rt6i_idev)
1069 			in6_dev_hold(rt->rt6i_idev);
1070 
1071 		rt->rt6i_gateway = ort->rt6i_gateway;
1072 		rt->rt6i_flags = ort->rt6i_flags;
1073 		rt->rt6i_metric = 0;
1074 
1075 		memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1076 #ifdef CONFIG_IPV6_SUBTREES
1077 		memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1078 #endif
1079 
1080 		dst_free(new);
1081 	}
1082 
1083 	dst_release(dst_orig);
1084 	return new ? new : ERR_PTR(-ENOMEM);
1085 }
1086 
1087 /*
1088  *	Destination cache support functions
1089  */
1090 
1091 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1092 {
1093 	struct rt6_info *rt;
1094 
1095 	rt = (struct rt6_info *) dst;
1096 
1097 	/* All IPV6 dsts are created with ->obsolete set to the value
1098 	 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1099 	 * into this function always.
1100 	 */
1101 	if (rt->rt6i_genid != rt_genid_ipv6(dev_net(rt->dst.dev)))
1102 		return NULL;
1103 
1104 	if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1105 		return NULL;
1106 
1107 	if (rt6_check_expired(rt))
1108 		return NULL;
1109 
1110 	return dst;
1111 }
1112 
1113 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1114 {
1115 	struct rt6_info *rt = (struct rt6_info *) dst;
1116 
1117 	if (rt) {
1118 		if (rt->rt6i_flags & RTF_CACHE) {
1119 			if (rt6_check_expired(rt)) {
1120 				ip6_del_rt(rt);
1121 				dst = NULL;
1122 			}
1123 		} else {
1124 			dst_release(dst);
1125 			dst = NULL;
1126 		}
1127 	}
1128 	return dst;
1129 }
1130 
1131 static void ip6_link_failure(struct sk_buff *skb)
1132 {
1133 	struct rt6_info *rt;
1134 
1135 	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1136 
1137 	rt = (struct rt6_info *) skb_dst(skb);
1138 	if (rt) {
1139 		if (rt->rt6i_flags & RTF_CACHE) {
1140 			dst_hold(&rt->dst);
1141 			if (ip6_del_rt(rt))
1142 				dst_free(&rt->dst);
1143 		} else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1144 			rt->rt6i_node->fn_sernum = -1;
1145 		}
1146 	}
1147 }
1148 
1149 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1150 			       struct sk_buff *skb, u32 mtu)
1151 {
1152 	struct rt6_info *rt6 = (struct rt6_info*)dst;
1153 
1154 	dst_confirm(dst);
1155 	if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
1156 		struct net *net = dev_net(dst->dev);
1157 
1158 		rt6->rt6i_flags |= RTF_MODIFIED;
1159 		if (mtu < IPV6_MIN_MTU) {
1160 			u32 features = dst_metric(dst, RTAX_FEATURES);
1161 			mtu = IPV6_MIN_MTU;
1162 			features |= RTAX_FEATURE_ALLFRAG;
1163 			dst_metric_set(dst, RTAX_FEATURES, features);
1164 		}
1165 		dst_metric_set(dst, RTAX_MTU, mtu);
1166 		rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires);
1167 	}
1168 }
1169 
1170 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1171 		     int oif, u32 mark)
1172 {
1173 	const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1174 	struct dst_entry *dst;
1175 	struct flowi6 fl6;
1176 
1177 	memset(&fl6, 0, sizeof(fl6));
1178 	fl6.flowi6_oif = oif;
1179 	fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
1180 	fl6.daddr = iph->daddr;
1181 	fl6.saddr = iph->saddr;
1182 	fl6.flowlabel = ip6_flowinfo(iph);
1183 
1184 	dst = ip6_route_output(net, NULL, &fl6);
1185 	if (!dst->error)
1186 		ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu));
1187 	dst_release(dst);
1188 }
1189 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1190 
1191 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1192 {
1193 	ip6_update_pmtu(skb, sock_net(sk), mtu,
1194 			sk->sk_bound_dev_if, sk->sk_mark);
1195 }
1196 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1197 
1198 /* Handle redirects */
1199 struct ip6rd_flowi {
1200 	struct flowi6 fl6;
1201 	struct in6_addr gateway;
1202 };
1203 
1204 static struct rt6_info *__ip6_route_redirect(struct net *net,
1205 					     struct fib6_table *table,
1206 					     struct flowi6 *fl6,
1207 					     int flags)
1208 {
1209 	struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1210 	struct rt6_info *rt;
1211 	struct fib6_node *fn;
1212 
1213 	/* Get the "current" route for this destination and
1214 	 * check if the redirect has come from approriate router.
1215 	 *
1216 	 * RFC 4861 specifies that redirects should only be
1217 	 * accepted if they come from the nexthop to the target.
1218 	 * Due to the way the routes are chosen, this notion
1219 	 * is a bit fuzzy and one might need to check all possible
1220 	 * routes.
1221 	 */
1222 
1223 	read_lock_bh(&table->tb6_lock);
1224 	fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1225 restart:
1226 	for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1227 		if (rt6_check_expired(rt))
1228 			continue;
1229 		if (rt->dst.error)
1230 			break;
1231 		if (!(rt->rt6i_flags & RTF_GATEWAY))
1232 			continue;
1233 		if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1234 			continue;
1235 		if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1236 			continue;
1237 		break;
1238 	}
1239 
1240 	if (!rt)
1241 		rt = net->ipv6.ip6_null_entry;
1242 	else if (rt->dst.error) {
1243 		rt = net->ipv6.ip6_null_entry;
1244 		goto out;
1245 	}
1246 	BACKTRACK(net, &fl6->saddr);
1247 out:
1248 	dst_hold(&rt->dst);
1249 
1250 	read_unlock_bh(&table->tb6_lock);
1251 
1252 	return rt;
1253 };
1254 
1255 static struct dst_entry *ip6_route_redirect(struct net *net,
1256 					const struct flowi6 *fl6,
1257 					const struct in6_addr *gateway)
1258 {
1259 	int flags = RT6_LOOKUP_F_HAS_SADDR;
1260 	struct ip6rd_flowi rdfl;
1261 
1262 	rdfl.fl6 = *fl6;
1263 	rdfl.gateway = *gateway;
1264 
1265 	return fib6_rule_lookup(net, &rdfl.fl6,
1266 				flags, __ip6_route_redirect);
1267 }
1268 
1269 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1270 {
1271 	const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1272 	struct dst_entry *dst;
1273 	struct flowi6 fl6;
1274 
1275 	memset(&fl6, 0, sizeof(fl6));
1276 	fl6.flowi6_iif = LOOPBACK_IFINDEX;
1277 	fl6.flowi6_oif = oif;
1278 	fl6.flowi6_mark = mark;
1279 	fl6.daddr = iph->daddr;
1280 	fl6.saddr = iph->saddr;
1281 	fl6.flowlabel = ip6_flowinfo(iph);
1282 
1283 	dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1284 	rt6_do_redirect(dst, NULL, skb);
1285 	dst_release(dst);
1286 }
1287 EXPORT_SYMBOL_GPL(ip6_redirect);
1288 
1289 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1290 			    u32 mark)
1291 {
1292 	const struct ipv6hdr *iph = ipv6_hdr(skb);
1293 	const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1294 	struct dst_entry *dst;
1295 	struct flowi6 fl6;
1296 
1297 	memset(&fl6, 0, sizeof(fl6));
1298 	fl6.flowi6_iif = LOOPBACK_IFINDEX;
1299 	fl6.flowi6_oif = oif;
1300 	fl6.flowi6_mark = mark;
1301 	fl6.daddr = msg->dest;
1302 	fl6.saddr = iph->daddr;
1303 
1304 	dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1305 	rt6_do_redirect(dst, NULL, skb);
1306 	dst_release(dst);
1307 }
1308 
1309 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1310 {
1311 	ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1312 }
1313 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1314 
1315 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1316 {
1317 	struct net_device *dev = dst->dev;
1318 	unsigned int mtu = dst_mtu(dst);
1319 	struct net *net = dev_net(dev);
1320 
1321 	mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1322 
1323 	if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1324 		mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1325 
1326 	/*
1327 	 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1328 	 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1329 	 * IPV6_MAXPLEN is also valid and means: "any MSS,
1330 	 * rely only on pmtu discovery"
1331 	 */
1332 	if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1333 		mtu = IPV6_MAXPLEN;
1334 	return mtu;
1335 }
1336 
1337 static unsigned int ip6_mtu(const struct dst_entry *dst)
1338 {
1339 	struct inet6_dev *idev;
1340 	unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
1341 
1342 	if (mtu)
1343 		goto out;
1344 
1345 	mtu = IPV6_MIN_MTU;
1346 
1347 	rcu_read_lock();
1348 	idev = __in6_dev_get(dst->dev);
1349 	if (idev)
1350 		mtu = idev->cnf.mtu6;
1351 	rcu_read_unlock();
1352 
1353 out:
1354 	return min_t(unsigned int, mtu, IP6_MAX_MTU);
1355 }
1356 
1357 static struct dst_entry *icmp6_dst_gc_list;
1358 static DEFINE_SPINLOCK(icmp6_dst_lock);
1359 
1360 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1361 				  struct flowi6 *fl6)
1362 {
1363 	struct dst_entry *dst;
1364 	struct rt6_info *rt;
1365 	struct inet6_dev *idev = in6_dev_get(dev);
1366 	struct net *net = dev_net(dev);
1367 
1368 	if (unlikely(!idev))
1369 		return ERR_PTR(-ENODEV);
1370 
1371 	rt = ip6_dst_alloc(net, dev, 0, NULL);
1372 	if (unlikely(!rt)) {
1373 		in6_dev_put(idev);
1374 		dst = ERR_PTR(-ENOMEM);
1375 		goto out;
1376 	}
1377 
1378 	rt->dst.flags |= DST_HOST;
1379 	rt->dst.output  = ip6_output;
1380 	atomic_set(&rt->dst.__refcnt, 1);
1381 	rt->rt6i_gateway  = fl6->daddr;
1382 	rt->rt6i_dst.addr = fl6->daddr;
1383 	rt->rt6i_dst.plen = 128;
1384 	rt->rt6i_idev     = idev;
1385 	dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1386 
1387 	spin_lock_bh(&icmp6_dst_lock);
1388 	rt->dst.next = icmp6_dst_gc_list;
1389 	icmp6_dst_gc_list = &rt->dst;
1390 	spin_unlock_bh(&icmp6_dst_lock);
1391 
1392 	fib6_force_start_gc(net);
1393 
1394 	dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1395 
1396 out:
1397 	return dst;
1398 }
1399 
1400 int icmp6_dst_gc(void)
1401 {
1402 	struct dst_entry *dst, **pprev;
1403 	int more = 0;
1404 
1405 	spin_lock_bh(&icmp6_dst_lock);
1406 	pprev = &icmp6_dst_gc_list;
1407 
1408 	while ((dst = *pprev) != NULL) {
1409 		if (!atomic_read(&dst->__refcnt)) {
1410 			*pprev = dst->next;
1411 			dst_free(dst);
1412 		} else {
1413 			pprev = &dst->next;
1414 			++more;
1415 		}
1416 	}
1417 
1418 	spin_unlock_bh(&icmp6_dst_lock);
1419 
1420 	return more;
1421 }
1422 
1423 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1424 			    void *arg)
1425 {
1426 	struct dst_entry *dst, **pprev;
1427 
1428 	spin_lock_bh(&icmp6_dst_lock);
1429 	pprev = &icmp6_dst_gc_list;
1430 	while ((dst = *pprev) != NULL) {
1431 		struct rt6_info *rt = (struct rt6_info *) dst;
1432 		if (func(rt, arg)) {
1433 			*pprev = dst->next;
1434 			dst_free(dst);
1435 		} else {
1436 			pprev = &dst->next;
1437 		}
1438 	}
1439 	spin_unlock_bh(&icmp6_dst_lock);
1440 }
1441 
1442 static int ip6_dst_gc(struct dst_ops *ops)
1443 {
1444 	struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1445 	int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1446 	int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1447 	int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1448 	int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1449 	unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1450 	int entries;
1451 
1452 	entries = dst_entries_get_fast(ops);
1453 	if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1454 	    entries <= rt_max_size)
1455 		goto out;
1456 
1457 	net->ipv6.ip6_rt_gc_expire++;
1458 	fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
1459 	entries = dst_entries_get_slow(ops);
1460 	if (entries < ops->gc_thresh)
1461 		net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1462 out:
1463 	net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1464 	return entries > rt_max_size;
1465 }
1466 
1467 /*
1468  *
1469  */
1470 
1471 int ip6_route_add(struct fib6_config *cfg)
1472 {
1473 	int err;
1474 	struct net *net = cfg->fc_nlinfo.nl_net;
1475 	struct rt6_info *rt = NULL;
1476 	struct net_device *dev = NULL;
1477 	struct inet6_dev *idev = NULL;
1478 	struct fib6_table *table;
1479 	int addr_type;
1480 
1481 	if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1482 		return -EINVAL;
1483 #ifndef CONFIG_IPV6_SUBTREES
1484 	if (cfg->fc_src_len)
1485 		return -EINVAL;
1486 #endif
1487 	if (cfg->fc_ifindex) {
1488 		err = -ENODEV;
1489 		dev = dev_get_by_index(net, cfg->fc_ifindex);
1490 		if (!dev)
1491 			goto out;
1492 		idev = in6_dev_get(dev);
1493 		if (!idev)
1494 			goto out;
1495 	}
1496 
1497 	if (cfg->fc_metric == 0)
1498 		cfg->fc_metric = IP6_RT_PRIO_USER;
1499 
1500 	err = -ENOBUFS;
1501 	if (cfg->fc_nlinfo.nlh &&
1502 	    !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1503 		table = fib6_get_table(net, cfg->fc_table);
1504 		if (!table) {
1505 			pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1506 			table = fib6_new_table(net, cfg->fc_table);
1507 		}
1508 	} else {
1509 		table = fib6_new_table(net, cfg->fc_table);
1510 	}
1511 
1512 	if (!table)
1513 		goto out;
1514 
1515 	rt = ip6_dst_alloc(net, NULL, (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT, table);
1516 
1517 	if (!rt) {
1518 		err = -ENOMEM;
1519 		goto out;
1520 	}
1521 
1522 	if (cfg->fc_flags & RTF_EXPIRES)
1523 		rt6_set_expires(rt, jiffies +
1524 				clock_t_to_jiffies(cfg->fc_expires));
1525 	else
1526 		rt6_clean_expires(rt);
1527 
1528 	if (cfg->fc_protocol == RTPROT_UNSPEC)
1529 		cfg->fc_protocol = RTPROT_BOOT;
1530 	rt->rt6i_protocol = cfg->fc_protocol;
1531 
1532 	addr_type = ipv6_addr_type(&cfg->fc_dst);
1533 
1534 	if (addr_type & IPV6_ADDR_MULTICAST)
1535 		rt->dst.input = ip6_mc_input;
1536 	else if (cfg->fc_flags & RTF_LOCAL)
1537 		rt->dst.input = ip6_input;
1538 	else
1539 		rt->dst.input = ip6_forward;
1540 
1541 	rt->dst.output = ip6_output;
1542 
1543 	ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1544 	rt->rt6i_dst.plen = cfg->fc_dst_len;
1545 	if (rt->rt6i_dst.plen == 128) {
1546 		rt->dst.flags |= DST_HOST;
1547 		dst_metrics_set_force_overwrite(&rt->dst);
1548 	}
1549 
1550 #ifdef CONFIG_IPV6_SUBTREES
1551 	ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1552 	rt->rt6i_src.plen = cfg->fc_src_len;
1553 #endif
1554 
1555 	rt->rt6i_metric = cfg->fc_metric;
1556 
1557 	/* We cannot add true routes via loopback here,
1558 	   they would result in kernel looping; promote them to reject routes
1559 	 */
1560 	if ((cfg->fc_flags & RTF_REJECT) ||
1561 	    (dev && (dev->flags & IFF_LOOPBACK) &&
1562 	     !(addr_type & IPV6_ADDR_LOOPBACK) &&
1563 	     !(cfg->fc_flags & RTF_LOCAL))) {
1564 		/* hold loopback dev/idev if we haven't done so. */
1565 		if (dev != net->loopback_dev) {
1566 			if (dev) {
1567 				dev_put(dev);
1568 				in6_dev_put(idev);
1569 			}
1570 			dev = net->loopback_dev;
1571 			dev_hold(dev);
1572 			idev = in6_dev_get(dev);
1573 			if (!idev) {
1574 				err = -ENODEV;
1575 				goto out;
1576 			}
1577 		}
1578 		rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1579 		switch (cfg->fc_type) {
1580 		case RTN_BLACKHOLE:
1581 			rt->dst.error = -EINVAL;
1582 			rt->dst.output = dst_discard_sk;
1583 			rt->dst.input = dst_discard;
1584 			break;
1585 		case RTN_PROHIBIT:
1586 			rt->dst.error = -EACCES;
1587 			rt->dst.output = ip6_pkt_prohibit_out;
1588 			rt->dst.input = ip6_pkt_prohibit;
1589 			break;
1590 		case RTN_THROW:
1591 		default:
1592 			rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1593 					: -ENETUNREACH;
1594 			rt->dst.output = ip6_pkt_discard_out;
1595 			rt->dst.input = ip6_pkt_discard;
1596 			break;
1597 		}
1598 		goto install_route;
1599 	}
1600 
1601 	if (cfg->fc_flags & RTF_GATEWAY) {
1602 		const struct in6_addr *gw_addr;
1603 		int gwa_type;
1604 
1605 		gw_addr = &cfg->fc_gateway;
1606 		rt->rt6i_gateway = *gw_addr;
1607 		gwa_type = ipv6_addr_type(gw_addr);
1608 
1609 		if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1610 			struct rt6_info *grt;
1611 
1612 			/* IPv6 strictly inhibits using not link-local
1613 			   addresses as nexthop address.
1614 			   Otherwise, router will not able to send redirects.
1615 			   It is very good, but in some (rare!) circumstances
1616 			   (SIT, PtP, NBMA NOARP links) it is handy to allow
1617 			   some exceptions. --ANK
1618 			 */
1619 			err = -EINVAL;
1620 			if (!(gwa_type & IPV6_ADDR_UNICAST))
1621 				goto out;
1622 
1623 			grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1624 
1625 			err = -EHOSTUNREACH;
1626 			if (!grt)
1627 				goto out;
1628 			if (dev) {
1629 				if (dev != grt->dst.dev) {
1630 					ip6_rt_put(grt);
1631 					goto out;
1632 				}
1633 			} else {
1634 				dev = grt->dst.dev;
1635 				idev = grt->rt6i_idev;
1636 				dev_hold(dev);
1637 				in6_dev_hold(grt->rt6i_idev);
1638 			}
1639 			if (!(grt->rt6i_flags & RTF_GATEWAY))
1640 				err = 0;
1641 			ip6_rt_put(grt);
1642 
1643 			if (err)
1644 				goto out;
1645 		}
1646 		err = -EINVAL;
1647 		if (!dev || (dev->flags & IFF_LOOPBACK))
1648 			goto out;
1649 	}
1650 
1651 	err = -ENODEV;
1652 	if (!dev)
1653 		goto out;
1654 
1655 	if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1656 		if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1657 			err = -EINVAL;
1658 			goto out;
1659 		}
1660 		rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1661 		rt->rt6i_prefsrc.plen = 128;
1662 	} else
1663 		rt->rt6i_prefsrc.plen = 0;
1664 
1665 	rt->rt6i_flags = cfg->fc_flags;
1666 
1667 install_route:
1668 	rt->dst.dev = dev;
1669 	rt->rt6i_idev = idev;
1670 	rt->rt6i_table = table;
1671 
1672 	cfg->fc_nlinfo.nl_net = dev_net(dev);
1673 
1674 	return __ip6_ins_rt(rt, &cfg->fc_nlinfo, cfg->fc_mx, cfg->fc_mx_len);
1675 
1676 out:
1677 	if (dev)
1678 		dev_put(dev);
1679 	if (idev)
1680 		in6_dev_put(idev);
1681 	if (rt)
1682 		dst_free(&rt->dst);
1683 	return err;
1684 }
1685 
1686 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1687 {
1688 	int err;
1689 	struct fib6_table *table;
1690 	struct net *net = dev_net(rt->dst.dev);
1691 
1692 	if (rt == net->ipv6.ip6_null_entry) {
1693 		err = -ENOENT;
1694 		goto out;
1695 	}
1696 
1697 	table = rt->rt6i_table;
1698 	write_lock_bh(&table->tb6_lock);
1699 	err = fib6_del(rt, info);
1700 	write_unlock_bh(&table->tb6_lock);
1701 
1702 out:
1703 	ip6_rt_put(rt);
1704 	return err;
1705 }
1706 
1707 int ip6_del_rt(struct rt6_info *rt)
1708 {
1709 	struct nl_info info = {
1710 		.nl_net = dev_net(rt->dst.dev),
1711 	};
1712 	return __ip6_del_rt(rt, &info);
1713 }
1714 
1715 static int ip6_route_del(struct fib6_config *cfg)
1716 {
1717 	struct fib6_table *table;
1718 	struct fib6_node *fn;
1719 	struct rt6_info *rt;
1720 	int err = -ESRCH;
1721 
1722 	table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
1723 	if (!table)
1724 		return err;
1725 
1726 	read_lock_bh(&table->tb6_lock);
1727 
1728 	fn = fib6_locate(&table->tb6_root,
1729 			 &cfg->fc_dst, cfg->fc_dst_len,
1730 			 &cfg->fc_src, cfg->fc_src_len);
1731 
1732 	if (fn) {
1733 		for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1734 			if (cfg->fc_ifindex &&
1735 			    (!rt->dst.dev ||
1736 			     rt->dst.dev->ifindex != cfg->fc_ifindex))
1737 				continue;
1738 			if (cfg->fc_flags & RTF_GATEWAY &&
1739 			    !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1740 				continue;
1741 			if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1742 				continue;
1743 			dst_hold(&rt->dst);
1744 			read_unlock_bh(&table->tb6_lock);
1745 
1746 			return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1747 		}
1748 	}
1749 	read_unlock_bh(&table->tb6_lock);
1750 
1751 	return err;
1752 }
1753 
1754 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
1755 {
1756 	struct net *net = dev_net(skb->dev);
1757 	struct netevent_redirect netevent;
1758 	struct rt6_info *rt, *nrt = NULL;
1759 	struct ndisc_options ndopts;
1760 	struct inet6_dev *in6_dev;
1761 	struct neighbour *neigh;
1762 	struct rd_msg *msg;
1763 	int optlen, on_link;
1764 	u8 *lladdr;
1765 
1766 	optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1767 	optlen -= sizeof(*msg);
1768 
1769 	if (optlen < 0) {
1770 		net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
1771 		return;
1772 	}
1773 
1774 	msg = (struct rd_msg *)icmp6_hdr(skb);
1775 
1776 	if (ipv6_addr_is_multicast(&msg->dest)) {
1777 		net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
1778 		return;
1779 	}
1780 
1781 	on_link = 0;
1782 	if (ipv6_addr_equal(&msg->dest, &msg->target)) {
1783 		on_link = 1;
1784 	} else if (ipv6_addr_type(&msg->target) !=
1785 		   (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1786 		net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
1787 		return;
1788 	}
1789 
1790 	in6_dev = __in6_dev_get(skb->dev);
1791 	if (!in6_dev)
1792 		return;
1793 	if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
1794 		return;
1795 
1796 	/* RFC2461 8.1:
1797 	 *	The IP source address of the Redirect MUST be the same as the current
1798 	 *	first-hop router for the specified ICMP Destination Address.
1799 	 */
1800 
1801 	if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
1802 		net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
1803 		return;
1804 	}
1805 
1806 	lladdr = NULL;
1807 	if (ndopts.nd_opts_tgt_lladdr) {
1808 		lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1809 					     skb->dev);
1810 		if (!lladdr) {
1811 			net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
1812 			return;
1813 		}
1814 	}
1815 
1816 	rt = (struct rt6_info *) dst;
1817 	if (rt == net->ipv6.ip6_null_entry) {
1818 		net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
1819 		return;
1820 	}
1821 
1822 	/* Redirect received -> path was valid.
1823 	 * Look, redirects are sent only in response to data packets,
1824 	 * so that this nexthop apparently is reachable. --ANK
1825 	 */
1826 	dst_confirm(&rt->dst);
1827 
1828 	neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
1829 	if (!neigh)
1830 		return;
1831 
1832 	/*
1833 	 *	We have finally decided to accept it.
1834 	 */
1835 
1836 	neigh_update(neigh, lladdr, NUD_STALE,
1837 		     NEIGH_UPDATE_F_WEAK_OVERRIDE|
1838 		     NEIGH_UPDATE_F_OVERRIDE|
1839 		     (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1840 				     NEIGH_UPDATE_F_ISROUTER))
1841 		     );
1842 
1843 	nrt = ip6_rt_copy(rt, &msg->dest);
1844 	if (!nrt)
1845 		goto out;
1846 
1847 	nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1848 	if (on_link)
1849 		nrt->rt6i_flags &= ~RTF_GATEWAY;
1850 
1851 	nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1852 
1853 	if (ip6_ins_rt(nrt))
1854 		goto out;
1855 
1856 	netevent.old = &rt->dst;
1857 	netevent.new = &nrt->dst;
1858 	netevent.daddr = &msg->dest;
1859 	netevent.neigh = neigh;
1860 	call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1861 
1862 	if (rt->rt6i_flags & RTF_CACHE) {
1863 		rt = (struct rt6_info *) dst_clone(&rt->dst);
1864 		ip6_del_rt(rt);
1865 	}
1866 
1867 out:
1868 	neigh_release(neigh);
1869 }
1870 
1871 /*
1872  *	Misc support functions
1873  */
1874 
1875 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
1876 				    const struct in6_addr *dest)
1877 {
1878 	struct net *net = dev_net(ort->dst.dev);
1879 	struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0,
1880 					    ort->rt6i_table);
1881 
1882 	if (rt) {
1883 		rt->dst.input = ort->dst.input;
1884 		rt->dst.output = ort->dst.output;
1885 		rt->dst.flags |= DST_HOST;
1886 
1887 		rt->rt6i_dst.addr = *dest;
1888 		rt->rt6i_dst.plen = 128;
1889 		dst_copy_metrics(&rt->dst, &ort->dst);
1890 		rt->dst.error = ort->dst.error;
1891 		rt->rt6i_idev = ort->rt6i_idev;
1892 		if (rt->rt6i_idev)
1893 			in6_dev_hold(rt->rt6i_idev);
1894 		rt->dst.lastuse = jiffies;
1895 
1896 		if (ort->rt6i_flags & RTF_GATEWAY)
1897 			rt->rt6i_gateway = ort->rt6i_gateway;
1898 		else
1899 			rt->rt6i_gateway = *dest;
1900 		rt->rt6i_flags = ort->rt6i_flags;
1901 		rt6_set_from(rt, ort);
1902 		rt->rt6i_metric = 0;
1903 
1904 #ifdef CONFIG_IPV6_SUBTREES
1905 		memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1906 #endif
1907 		memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
1908 		rt->rt6i_table = ort->rt6i_table;
1909 	}
1910 	return rt;
1911 }
1912 
1913 #ifdef CONFIG_IPV6_ROUTE_INFO
1914 static struct rt6_info *rt6_get_route_info(struct net *net,
1915 					   const struct in6_addr *prefix, int prefixlen,
1916 					   const struct in6_addr *gwaddr, int ifindex)
1917 {
1918 	struct fib6_node *fn;
1919 	struct rt6_info *rt = NULL;
1920 	struct fib6_table *table;
1921 
1922 	table = fib6_get_table(net, RT6_TABLE_INFO);
1923 	if (!table)
1924 		return NULL;
1925 
1926 	read_lock_bh(&table->tb6_lock);
1927 	fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1928 	if (!fn)
1929 		goto out;
1930 
1931 	for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1932 		if (rt->dst.dev->ifindex != ifindex)
1933 			continue;
1934 		if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1935 			continue;
1936 		if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1937 			continue;
1938 		dst_hold(&rt->dst);
1939 		break;
1940 	}
1941 out:
1942 	read_unlock_bh(&table->tb6_lock);
1943 	return rt;
1944 }
1945 
1946 static struct rt6_info *rt6_add_route_info(struct net *net,
1947 					   const struct in6_addr *prefix, int prefixlen,
1948 					   const struct in6_addr *gwaddr, int ifindex,
1949 					   unsigned int pref)
1950 {
1951 	struct fib6_config cfg = {
1952 		.fc_table	= RT6_TABLE_INFO,
1953 		.fc_metric	= IP6_RT_PRIO_USER,
1954 		.fc_ifindex	= ifindex,
1955 		.fc_dst_len	= prefixlen,
1956 		.fc_flags	= RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1957 				  RTF_UP | RTF_PREF(pref),
1958 		.fc_nlinfo.portid = 0,
1959 		.fc_nlinfo.nlh = NULL,
1960 		.fc_nlinfo.nl_net = net,
1961 	};
1962 
1963 	cfg.fc_dst = *prefix;
1964 	cfg.fc_gateway = *gwaddr;
1965 
1966 	/* We should treat it as a default route if prefix length is 0. */
1967 	if (!prefixlen)
1968 		cfg.fc_flags |= RTF_DEFAULT;
1969 
1970 	ip6_route_add(&cfg);
1971 
1972 	return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
1973 }
1974 #endif
1975 
1976 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1977 {
1978 	struct rt6_info *rt;
1979 	struct fib6_table *table;
1980 
1981 	table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
1982 	if (!table)
1983 		return NULL;
1984 
1985 	read_lock_bh(&table->tb6_lock);
1986 	for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
1987 		if (dev == rt->dst.dev &&
1988 		    ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1989 		    ipv6_addr_equal(&rt->rt6i_gateway, addr))
1990 			break;
1991 	}
1992 	if (rt)
1993 		dst_hold(&rt->dst);
1994 	read_unlock_bh(&table->tb6_lock);
1995 	return rt;
1996 }
1997 
1998 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
1999 				     struct net_device *dev,
2000 				     unsigned int pref)
2001 {
2002 	struct fib6_config cfg = {
2003 		.fc_table	= RT6_TABLE_DFLT,
2004 		.fc_metric	= IP6_RT_PRIO_USER,
2005 		.fc_ifindex	= dev->ifindex,
2006 		.fc_flags	= RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2007 				  RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2008 		.fc_nlinfo.portid = 0,
2009 		.fc_nlinfo.nlh = NULL,
2010 		.fc_nlinfo.nl_net = dev_net(dev),
2011 	};
2012 
2013 	cfg.fc_gateway = *gwaddr;
2014 
2015 	ip6_route_add(&cfg);
2016 
2017 	return rt6_get_dflt_router(gwaddr, dev);
2018 }
2019 
2020 void rt6_purge_dflt_routers(struct net *net)
2021 {
2022 	struct rt6_info *rt;
2023 	struct fib6_table *table;
2024 
2025 	/* NOTE: Keep consistent with rt6_get_dflt_router */
2026 	table = fib6_get_table(net, RT6_TABLE_DFLT);
2027 	if (!table)
2028 		return;
2029 
2030 restart:
2031 	read_lock_bh(&table->tb6_lock);
2032 	for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2033 		if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2034 		    (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2035 			dst_hold(&rt->dst);
2036 			read_unlock_bh(&table->tb6_lock);
2037 			ip6_del_rt(rt);
2038 			goto restart;
2039 		}
2040 	}
2041 	read_unlock_bh(&table->tb6_lock);
2042 }
2043 
2044 static void rtmsg_to_fib6_config(struct net *net,
2045 				 struct in6_rtmsg *rtmsg,
2046 				 struct fib6_config *cfg)
2047 {
2048 	memset(cfg, 0, sizeof(*cfg));
2049 
2050 	cfg->fc_table = RT6_TABLE_MAIN;
2051 	cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2052 	cfg->fc_metric = rtmsg->rtmsg_metric;
2053 	cfg->fc_expires = rtmsg->rtmsg_info;
2054 	cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2055 	cfg->fc_src_len = rtmsg->rtmsg_src_len;
2056 	cfg->fc_flags = rtmsg->rtmsg_flags;
2057 
2058 	cfg->fc_nlinfo.nl_net = net;
2059 
2060 	cfg->fc_dst = rtmsg->rtmsg_dst;
2061 	cfg->fc_src = rtmsg->rtmsg_src;
2062 	cfg->fc_gateway = rtmsg->rtmsg_gateway;
2063 }
2064 
2065 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2066 {
2067 	struct fib6_config cfg;
2068 	struct in6_rtmsg rtmsg;
2069 	int err;
2070 
2071 	switch(cmd) {
2072 	case SIOCADDRT:		/* Add a route */
2073 	case SIOCDELRT:		/* Delete a route */
2074 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2075 			return -EPERM;
2076 		err = copy_from_user(&rtmsg, arg,
2077 				     sizeof(struct in6_rtmsg));
2078 		if (err)
2079 			return -EFAULT;
2080 
2081 		rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2082 
2083 		rtnl_lock();
2084 		switch (cmd) {
2085 		case SIOCADDRT:
2086 			err = ip6_route_add(&cfg);
2087 			break;
2088 		case SIOCDELRT:
2089 			err = ip6_route_del(&cfg);
2090 			break;
2091 		default:
2092 			err = -EINVAL;
2093 		}
2094 		rtnl_unlock();
2095 
2096 		return err;
2097 	}
2098 
2099 	return -EINVAL;
2100 }
2101 
2102 /*
2103  *	Drop the packet on the floor
2104  */
2105 
2106 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2107 {
2108 	int type;
2109 	struct dst_entry *dst = skb_dst(skb);
2110 	switch (ipstats_mib_noroutes) {
2111 	case IPSTATS_MIB_INNOROUTES:
2112 		type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2113 		if (type == IPV6_ADDR_ANY) {
2114 			IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2115 				      IPSTATS_MIB_INADDRERRORS);
2116 			break;
2117 		}
2118 		/* FALLTHROUGH */
2119 	case IPSTATS_MIB_OUTNOROUTES:
2120 		IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2121 			      ipstats_mib_noroutes);
2122 		break;
2123 	}
2124 	icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2125 	kfree_skb(skb);
2126 	return 0;
2127 }
2128 
2129 static int ip6_pkt_discard(struct sk_buff *skb)
2130 {
2131 	return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2132 }
2133 
2134 static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb)
2135 {
2136 	skb->dev = skb_dst(skb)->dev;
2137 	return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2138 }
2139 
2140 static int ip6_pkt_prohibit(struct sk_buff *skb)
2141 {
2142 	return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2143 }
2144 
2145 static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb)
2146 {
2147 	skb->dev = skb_dst(skb)->dev;
2148 	return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2149 }
2150 
2151 /*
2152  *	Allocate a dst for local (unicast / anycast) address.
2153  */
2154 
2155 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2156 				    const struct in6_addr *addr,
2157 				    bool anycast)
2158 {
2159 	struct net *net = dev_net(idev->dev);
2160 	struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2161 					    DST_NOCOUNT, NULL);
2162 	if (!rt)
2163 		return ERR_PTR(-ENOMEM);
2164 
2165 	in6_dev_hold(idev);
2166 
2167 	rt->dst.flags |= DST_HOST;
2168 	rt->dst.input = ip6_input;
2169 	rt->dst.output = ip6_output;
2170 	rt->rt6i_idev = idev;
2171 
2172 	rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2173 	if (anycast)
2174 		rt->rt6i_flags |= RTF_ANYCAST;
2175 	else
2176 		rt->rt6i_flags |= RTF_LOCAL;
2177 
2178 	rt->rt6i_gateway  = *addr;
2179 	rt->rt6i_dst.addr = *addr;
2180 	rt->rt6i_dst.plen = 128;
2181 	rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2182 
2183 	atomic_set(&rt->dst.__refcnt, 1);
2184 
2185 	return rt;
2186 }
2187 
2188 int ip6_route_get_saddr(struct net *net,
2189 			struct rt6_info *rt,
2190 			const struct in6_addr *daddr,
2191 			unsigned int prefs,
2192 			struct in6_addr *saddr)
2193 {
2194 	struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
2195 	int err = 0;
2196 	if (rt->rt6i_prefsrc.plen)
2197 		*saddr = rt->rt6i_prefsrc.addr;
2198 	else
2199 		err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2200 					 daddr, prefs, saddr);
2201 	return err;
2202 }
2203 
2204 /* remove deleted ip from prefsrc entries */
2205 struct arg_dev_net_ip {
2206 	struct net_device *dev;
2207 	struct net *net;
2208 	struct in6_addr *addr;
2209 };
2210 
2211 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2212 {
2213 	struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2214 	struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2215 	struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2216 
2217 	if (((void *)rt->dst.dev == dev || !dev) &&
2218 	    rt != net->ipv6.ip6_null_entry &&
2219 	    ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2220 		/* remove prefsrc entry */
2221 		rt->rt6i_prefsrc.plen = 0;
2222 	}
2223 	return 0;
2224 }
2225 
2226 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2227 {
2228 	struct net *net = dev_net(ifp->idev->dev);
2229 	struct arg_dev_net_ip adni = {
2230 		.dev = ifp->idev->dev,
2231 		.net = net,
2232 		.addr = &ifp->addr,
2233 	};
2234 	fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2235 }
2236 
2237 #define RTF_RA_ROUTER		(RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2238 #define RTF_CACHE_GATEWAY	(RTF_GATEWAY | RTF_CACHE)
2239 
2240 /* Remove routers and update dst entries when gateway turn into host. */
2241 static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2242 {
2243 	struct in6_addr *gateway = (struct in6_addr *)arg;
2244 
2245 	if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2246 	     ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2247 	     ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2248 		return -1;
2249 	}
2250 	return 0;
2251 }
2252 
2253 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2254 {
2255 	fib6_clean_all(net, fib6_clean_tohost, gateway);
2256 }
2257 
2258 struct arg_dev_net {
2259 	struct net_device *dev;
2260 	struct net *net;
2261 };
2262 
2263 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2264 {
2265 	const struct arg_dev_net *adn = arg;
2266 	const struct net_device *dev = adn->dev;
2267 
2268 	if ((rt->dst.dev == dev || !dev) &&
2269 	    rt != adn->net->ipv6.ip6_null_entry)
2270 		return -1;
2271 
2272 	return 0;
2273 }
2274 
2275 void rt6_ifdown(struct net *net, struct net_device *dev)
2276 {
2277 	struct arg_dev_net adn = {
2278 		.dev = dev,
2279 		.net = net,
2280 	};
2281 
2282 	fib6_clean_all(net, fib6_ifdown, &adn);
2283 	icmp6_clean_all(fib6_ifdown, &adn);
2284 }
2285 
2286 struct rt6_mtu_change_arg {
2287 	struct net_device *dev;
2288 	unsigned int mtu;
2289 };
2290 
2291 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2292 {
2293 	struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2294 	struct inet6_dev *idev;
2295 
2296 	/* In IPv6 pmtu discovery is not optional,
2297 	   so that RTAX_MTU lock cannot disable it.
2298 	   We still use this lock to block changes
2299 	   caused by addrconf/ndisc.
2300 	*/
2301 
2302 	idev = __in6_dev_get(arg->dev);
2303 	if (!idev)
2304 		return 0;
2305 
2306 	/* For administrative MTU increase, there is no way to discover
2307 	   IPv6 PMTU increase, so PMTU increase should be updated here.
2308 	   Since RFC 1981 doesn't include administrative MTU increase
2309 	   update PMTU increase is a MUST. (i.e. jumbo frame)
2310 	 */
2311 	/*
2312 	   If new MTU is less than route PMTU, this new MTU will be the
2313 	   lowest MTU in the path, update the route PMTU to reflect PMTU
2314 	   decreases; if new MTU is greater than route PMTU, and the
2315 	   old MTU is the lowest MTU in the path, update the route PMTU
2316 	   to reflect the increase. In this case if the other nodes' MTU
2317 	   also have the lowest MTU, TOO BIG MESSAGE will be lead to
2318 	   PMTU discouvery.
2319 	 */
2320 	if (rt->dst.dev == arg->dev &&
2321 	    !dst_metric_locked(&rt->dst, RTAX_MTU) &&
2322 	    (dst_mtu(&rt->dst) >= arg->mtu ||
2323 	     (dst_mtu(&rt->dst) < arg->mtu &&
2324 	      dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
2325 		dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2326 	}
2327 	return 0;
2328 }
2329 
2330 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2331 {
2332 	struct rt6_mtu_change_arg arg = {
2333 		.dev = dev,
2334 		.mtu = mtu,
2335 	};
2336 
2337 	fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2338 }
2339 
2340 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2341 	[RTA_GATEWAY]           = { .len = sizeof(struct in6_addr) },
2342 	[RTA_OIF]               = { .type = NLA_U32 },
2343 	[RTA_IIF]		= { .type = NLA_U32 },
2344 	[RTA_PRIORITY]          = { .type = NLA_U32 },
2345 	[RTA_METRICS]           = { .type = NLA_NESTED },
2346 	[RTA_MULTIPATH]		= { .len = sizeof(struct rtnexthop) },
2347 };
2348 
2349 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2350 			      struct fib6_config *cfg)
2351 {
2352 	struct rtmsg *rtm;
2353 	struct nlattr *tb[RTA_MAX+1];
2354 	int err;
2355 
2356 	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2357 	if (err < 0)
2358 		goto errout;
2359 
2360 	err = -EINVAL;
2361 	rtm = nlmsg_data(nlh);
2362 	memset(cfg, 0, sizeof(*cfg));
2363 
2364 	cfg->fc_table = rtm->rtm_table;
2365 	cfg->fc_dst_len = rtm->rtm_dst_len;
2366 	cfg->fc_src_len = rtm->rtm_src_len;
2367 	cfg->fc_flags = RTF_UP;
2368 	cfg->fc_protocol = rtm->rtm_protocol;
2369 	cfg->fc_type = rtm->rtm_type;
2370 
2371 	if (rtm->rtm_type == RTN_UNREACHABLE ||
2372 	    rtm->rtm_type == RTN_BLACKHOLE ||
2373 	    rtm->rtm_type == RTN_PROHIBIT ||
2374 	    rtm->rtm_type == RTN_THROW)
2375 		cfg->fc_flags |= RTF_REJECT;
2376 
2377 	if (rtm->rtm_type == RTN_LOCAL)
2378 		cfg->fc_flags |= RTF_LOCAL;
2379 
2380 	cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2381 	cfg->fc_nlinfo.nlh = nlh;
2382 	cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2383 
2384 	if (tb[RTA_GATEWAY]) {
2385 		nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2386 		cfg->fc_flags |= RTF_GATEWAY;
2387 	}
2388 
2389 	if (tb[RTA_DST]) {
2390 		int plen = (rtm->rtm_dst_len + 7) >> 3;
2391 
2392 		if (nla_len(tb[RTA_DST]) < plen)
2393 			goto errout;
2394 
2395 		nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2396 	}
2397 
2398 	if (tb[RTA_SRC]) {
2399 		int plen = (rtm->rtm_src_len + 7) >> 3;
2400 
2401 		if (nla_len(tb[RTA_SRC]) < plen)
2402 			goto errout;
2403 
2404 		nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2405 	}
2406 
2407 	if (tb[RTA_PREFSRC])
2408 		nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
2409 
2410 	if (tb[RTA_OIF])
2411 		cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2412 
2413 	if (tb[RTA_PRIORITY])
2414 		cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2415 
2416 	if (tb[RTA_METRICS]) {
2417 		cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2418 		cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2419 	}
2420 
2421 	if (tb[RTA_TABLE])
2422 		cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2423 
2424 	if (tb[RTA_MULTIPATH]) {
2425 		cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2426 		cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2427 	}
2428 
2429 	err = 0;
2430 errout:
2431 	return err;
2432 }
2433 
2434 static int ip6_route_multipath(struct fib6_config *cfg, int add)
2435 {
2436 	struct fib6_config r_cfg;
2437 	struct rtnexthop *rtnh;
2438 	int remaining;
2439 	int attrlen;
2440 	int err = 0, last_err = 0;
2441 
2442 beginning:
2443 	rtnh = (struct rtnexthop *)cfg->fc_mp;
2444 	remaining = cfg->fc_mp_len;
2445 
2446 	/* Parse a Multipath Entry */
2447 	while (rtnh_ok(rtnh, remaining)) {
2448 		memcpy(&r_cfg, cfg, sizeof(*cfg));
2449 		if (rtnh->rtnh_ifindex)
2450 			r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2451 
2452 		attrlen = rtnh_attrlen(rtnh);
2453 		if (attrlen > 0) {
2454 			struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2455 
2456 			nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2457 			if (nla) {
2458 				nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2459 				r_cfg.fc_flags |= RTF_GATEWAY;
2460 			}
2461 		}
2462 		err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
2463 		if (err) {
2464 			last_err = err;
2465 			/* If we are trying to remove a route, do not stop the
2466 			 * loop when ip6_route_del() fails (because next hop is
2467 			 * already gone), we should try to remove all next hops.
2468 			 */
2469 			if (add) {
2470 				/* If add fails, we should try to delete all
2471 				 * next hops that have been already added.
2472 				 */
2473 				add = 0;
2474 				goto beginning;
2475 			}
2476 		}
2477 		/* Because each route is added like a single route we remove
2478 		 * this flag after the first nexthop (if there is a collision,
2479 		 * we have already fail to add the first nexthop:
2480 		 * fib6_add_rt2node() has reject it).
2481 		 */
2482 		cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL;
2483 		rtnh = rtnh_next(rtnh, &remaining);
2484 	}
2485 
2486 	return last_err;
2487 }
2488 
2489 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2490 {
2491 	struct fib6_config cfg;
2492 	int err;
2493 
2494 	err = rtm_to_fib6_config(skb, nlh, &cfg);
2495 	if (err < 0)
2496 		return err;
2497 
2498 	if (cfg.fc_mp)
2499 		return ip6_route_multipath(&cfg, 0);
2500 	else
2501 		return ip6_route_del(&cfg);
2502 }
2503 
2504 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2505 {
2506 	struct fib6_config cfg;
2507 	int err;
2508 
2509 	err = rtm_to_fib6_config(skb, nlh, &cfg);
2510 	if (err < 0)
2511 		return err;
2512 
2513 	if (cfg.fc_mp)
2514 		return ip6_route_multipath(&cfg, 1);
2515 	else
2516 		return ip6_route_add(&cfg);
2517 }
2518 
2519 static inline size_t rt6_nlmsg_size(void)
2520 {
2521 	return NLMSG_ALIGN(sizeof(struct rtmsg))
2522 	       + nla_total_size(16) /* RTA_SRC */
2523 	       + nla_total_size(16) /* RTA_DST */
2524 	       + nla_total_size(16) /* RTA_GATEWAY */
2525 	       + nla_total_size(16) /* RTA_PREFSRC */
2526 	       + nla_total_size(4) /* RTA_TABLE */
2527 	       + nla_total_size(4) /* RTA_IIF */
2528 	       + nla_total_size(4) /* RTA_OIF */
2529 	       + nla_total_size(4) /* RTA_PRIORITY */
2530 	       + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2531 	       + nla_total_size(sizeof(struct rta_cacheinfo));
2532 }
2533 
2534 static int rt6_fill_node(struct net *net,
2535 			 struct sk_buff *skb, struct rt6_info *rt,
2536 			 struct in6_addr *dst, struct in6_addr *src,
2537 			 int iif, int type, u32 portid, u32 seq,
2538 			 int prefix, int nowait, unsigned int flags)
2539 {
2540 	struct rtmsg *rtm;
2541 	struct nlmsghdr *nlh;
2542 	long expires;
2543 	u32 table;
2544 
2545 	if (prefix) {	/* user wants prefix routes only */
2546 		if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2547 			/* success since this is not a prefix route */
2548 			return 1;
2549 		}
2550 	}
2551 
2552 	nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
2553 	if (!nlh)
2554 		return -EMSGSIZE;
2555 
2556 	rtm = nlmsg_data(nlh);
2557 	rtm->rtm_family = AF_INET6;
2558 	rtm->rtm_dst_len = rt->rt6i_dst.plen;
2559 	rtm->rtm_src_len = rt->rt6i_src.plen;
2560 	rtm->rtm_tos = 0;
2561 	if (rt->rt6i_table)
2562 		table = rt->rt6i_table->tb6_id;
2563 	else
2564 		table = RT6_TABLE_UNSPEC;
2565 	rtm->rtm_table = table;
2566 	if (nla_put_u32(skb, RTA_TABLE, table))
2567 		goto nla_put_failure;
2568 	if (rt->rt6i_flags & RTF_REJECT) {
2569 		switch (rt->dst.error) {
2570 		case -EINVAL:
2571 			rtm->rtm_type = RTN_BLACKHOLE;
2572 			break;
2573 		case -EACCES:
2574 			rtm->rtm_type = RTN_PROHIBIT;
2575 			break;
2576 		case -EAGAIN:
2577 			rtm->rtm_type = RTN_THROW;
2578 			break;
2579 		default:
2580 			rtm->rtm_type = RTN_UNREACHABLE;
2581 			break;
2582 		}
2583 	}
2584 	else if (rt->rt6i_flags & RTF_LOCAL)
2585 		rtm->rtm_type = RTN_LOCAL;
2586 	else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
2587 		rtm->rtm_type = RTN_LOCAL;
2588 	else
2589 		rtm->rtm_type = RTN_UNICAST;
2590 	rtm->rtm_flags = 0;
2591 	rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2592 	rtm->rtm_protocol = rt->rt6i_protocol;
2593 	if (rt->rt6i_flags & RTF_DYNAMIC)
2594 		rtm->rtm_protocol = RTPROT_REDIRECT;
2595 	else if (rt->rt6i_flags & RTF_ADDRCONF) {
2596 		if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
2597 			rtm->rtm_protocol = RTPROT_RA;
2598 		else
2599 			rtm->rtm_protocol = RTPROT_KERNEL;
2600 	}
2601 
2602 	if (rt->rt6i_flags & RTF_CACHE)
2603 		rtm->rtm_flags |= RTM_F_CLONED;
2604 
2605 	if (dst) {
2606 		if (nla_put(skb, RTA_DST, 16, dst))
2607 			goto nla_put_failure;
2608 		rtm->rtm_dst_len = 128;
2609 	} else if (rtm->rtm_dst_len)
2610 		if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr))
2611 			goto nla_put_failure;
2612 #ifdef CONFIG_IPV6_SUBTREES
2613 	if (src) {
2614 		if (nla_put(skb, RTA_SRC, 16, src))
2615 			goto nla_put_failure;
2616 		rtm->rtm_src_len = 128;
2617 	} else if (rtm->rtm_src_len &&
2618 		   nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr))
2619 		goto nla_put_failure;
2620 #endif
2621 	if (iif) {
2622 #ifdef CONFIG_IPV6_MROUTE
2623 		if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2624 			int err = ip6mr_get_route(net, skb, rtm, nowait);
2625 			if (err <= 0) {
2626 				if (!nowait) {
2627 					if (err == 0)
2628 						return 0;
2629 					goto nla_put_failure;
2630 				} else {
2631 					if (err == -EMSGSIZE)
2632 						goto nla_put_failure;
2633 				}
2634 			}
2635 		} else
2636 #endif
2637 			if (nla_put_u32(skb, RTA_IIF, iif))
2638 				goto nla_put_failure;
2639 	} else if (dst) {
2640 		struct in6_addr saddr_buf;
2641 		if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
2642 		    nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2643 			goto nla_put_failure;
2644 	}
2645 
2646 	if (rt->rt6i_prefsrc.plen) {
2647 		struct in6_addr saddr_buf;
2648 		saddr_buf = rt->rt6i_prefsrc.addr;
2649 		if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2650 			goto nla_put_failure;
2651 	}
2652 
2653 	if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
2654 		goto nla_put_failure;
2655 
2656 	if (rt->rt6i_flags & RTF_GATEWAY) {
2657 		if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0)
2658 			goto nla_put_failure;
2659 	}
2660 
2661 	if (rt->dst.dev &&
2662 	    nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
2663 		goto nla_put_failure;
2664 	if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
2665 		goto nla_put_failure;
2666 
2667 	expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
2668 
2669 	if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
2670 		goto nla_put_failure;
2671 
2672 	return nlmsg_end(skb, nlh);
2673 
2674 nla_put_failure:
2675 	nlmsg_cancel(skb, nlh);
2676 	return -EMSGSIZE;
2677 }
2678 
2679 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2680 {
2681 	struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2682 	int prefix;
2683 
2684 	if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2685 		struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2686 		prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2687 	} else
2688 		prefix = 0;
2689 
2690 	return rt6_fill_node(arg->net,
2691 		     arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2692 		     NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
2693 		     prefix, 0, NLM_F_MULTI);
2694 }
2695 
2696 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh)
2697 {
2698 	struct net *net = sock_net(in_skb->sk);
2699 	struct nlattr *tb[RTA_MAX+1];
2700 	struct rt6_info *rt;
2701 	struct sk_buff *skb;
2702 	struct rtmsg *rtm;
2703 	struct flowi6 fl6;
2704 	int err, iif = 0, oif = 0;
2705 
2706 	err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2707 	if (err < 0)
2708 		goto errout;
2709 
2710 	err = -EINVAL;
2711 	memset(&fl6, 0, sizeof(fl6));
2712 
2713 	if (tb[RTA_SRC]) {
2714 		if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2715 			goto errout;
2716 
2717 		fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
2718 	}
2719 
2720 	if (tb[RTA_DST]) {
2721 		if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2722 			goto errout;
2723 
2724 		fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
2725 	}
2726 
2727 	if (tb[RTA_IIF])
2728 		iif = nla_get_u32(tb[RTA_IIF]);
2729 
2730 	if (tb[RTA_OIF])
2731 		oif = nla_get_u32(tb[RTA_OIF]);
2732 
2733 	if (tb[RTA_MARK])
2734 		fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
2735 
2736 	if (iif) {
2737 		struct net_device *dev;
2738 		int flags = 0;
2739 
2740 		dev = __dev_get_by_index(net, iif);
2741 		if (!dev) {
2742 			err = -ENODEV;
2743 			goto errout;
2744 		}
2745 
2746 		fl6.flowi6_iif = iif;
2747 
2748 		if (!ipv6_addr_any(&fl6.saddr))
2749 			flags |= RT6_LOOKUP_F_HAS_SADDR;
2750 
2751 		rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
2752 							       flags);
2753 	} else {
2754 		fl6.flowi6_oif = oif;
2755 
2756 		rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
2757 	}
2758 
2759 	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2760 	if (!skb) {
2761 		ip6_rt_put(rt);
2762 		err = -ENOBUFS;
2763 		goto errout;
2764 	}
2765 
2766 	/* Reserve room for dummy headers, this skb can pass
2767 	   through good chunk of routing engine.
2768 	 */
2769 	skb_reset_mac_header(skb);
2770 	skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2771 
2772 	skb_dst_set(skb, &rt->dst);
2773 
2774 	err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
2775 			    RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
2776 			    nlh->nlmsg_seq, 0, 0, 0);
2777 	if (err < 0) {
2778 		kfree_skb(skb);
2779 		goto errout;
2780 	}
2781 
2782 	err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2783 errout:
2784 	return err;
2785 }
2786 
2787 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2788 {
2789 	struct sk_buff *skb;
2790 	struct net *net = info->nl_net;
2791 	u32 seq;
2792 	int err;
2793 
2794 	err = -ENOBUFS;
2795 	seq = info->nlh ? info->nlh->nlmsg_seq : 0;
2796 
2797 	skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2798 	if (!skb)
2799 		goto errout;
2800 
2801 	err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
2802 				event, info->portid, seq, 0, 0, 0);
2803 	if (err < 0) {
2804 		/* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2805 		WARN_ON(err == -EMSGSIZE);
2806 		kfree_skb(skb);
2807 		goto errout;
2808 	}
2809 	rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
2810 		    info->nlh, gfp_any());
2811 	return;
2812 errout:
2813 	if (err < 0)
2814 		rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
2815 }
2816 
2817 static int ip6_route_dev_notify(struct notifier_block *this,
2818 				unsigned long event, void *ptr)
2819 {
2820 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2821 	struct net *net = dev_net(dev);
2822 
2823 	if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
2824 		net->ipv6.ip6_null_entry->dst.dev = dev;
2825 		net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2826 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2827 		net->ipv6.ip6_prohibit_entry->dst.dev = dev;
2828 		net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
2829 		net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
2830 		net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2831 #endif
2832 	}
2833 
2834 	return NOTIFY_OK;
2835 }
2836 
2837 /*
2838  *	/proc
2839  */
2840 
2841 #ifdef CONFIG_PROC_FS
2842 
2843 static const struct file_operations ipv6_route_proc_fops = {
2844 	.owner		= THIS_MODULE,
2845 	.open		= ipv6_route_open,
2846 	.read		= seq_read,
2847 	.llseek		= seq_lseek,
2848 	.release	= seq_release_net,
2849 };
2850 
2851 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2852 {
2853 	struct net *net = (struct net *)seq->private;
2854 	seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2855 		   net->ipv6.rt6_stats->fib_nodes,
2856 		   net->ipv6.rt6_stats->fib_route_nodes,
2857 		   net->ipv6.rt6_stats->fib_rt_alloc,
2858 		   net->ipv6.rt6_stats->fib_rt_entries,
2859 		   net->ipv6.rt6_stats->fib_rt_cache,
2860 		   dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
2861 		   net->ipv6.rt6_stats->fib_discarded_routes);
2862 
2863 	return 0;
2864 }
2865 
2866 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2867 {
2868 	return single_open_net(inode, file, rt6_stats_seq_show);
2869 }
2870 
2871 static const struct file_operations rt6_stats_seq_fops = {
2872 	.owner	 = THIS_MODULE,
2873 	.open	 = rt6_stats_seq_open,
2874 	.read	 = seq_read,
2875 	.llseek	 = seq_lseek,
2876 	.release = single_release_net,
2877 };
2878 #endif	/* CONFIG_PROC_FS */
2879 
2880 #ifdef CONFIG_SYSCTL
2881 
2882 static
2883 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
2884 			      void __user *buffer, size_t *lenp, loff_t *ppos)
2885 {
2886 	struct net *net;
2887 	int delay;
2888 	if (!write)
2889 		return -EINVAL;
2890 
2891 	net = (struct net *)ctl->extra1;
2892 	delay = net->ipv6.sysctl.flush_delay;
2893 	proc_dointvec(ctl, write, buffer, lenp, ppos);
2894 	fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
2895 	return 0;
2896 }
2897 
2898 struct ctl_table ipv6_route_table_template[] = {
2899 	{
2900 		.procname	=	"flush",
2901 		.data		=	&init_net.ipv6.sysctl.flush_delay,
2902 		.maxlen		=	sizeof(int),
2903 		.mode		=	0200,
2904 		.proc_handler	=	ipv6_sysctl_rtcache_flush
2905 	},
2906 	{
2907 		.procname	=	"gc_thresh",
2908 		.data		=	&ip6_dst_ops_template.gc_thresh,
2909 		.maxlen		=	sizeof(int),
2910 		.mode		=	0644,
2911 		.proc_handler	=	proc_dointvec,
2912 	},
2913 	{
2914 		.procname	=	"max_size",
2915 		.data		=	&init_net.ipv6.sysctl.ip6_rt_max_size,
2916 		.maxlen		=	sizeof(int),
2917 		.mode		=	0644,
2918 		.proc_handler	=	proc_dointvec,
2919 	},
2920 	{
2921 		.procname	=	"gc_min_interval",
2922 		.data		=	&init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2923 		.maxlen		=	sizeof(int),
2924 		.mode		=	0644,
2925 		.proc_handler	=	proc_dointvec_jiffies,
2926 	},
2927 	{
2928 		.procname	=	"gc_timeout",
2929 		.data		=	&init_net.ipv6.sysctl.ip6_rt_gc_timeout,
2930 		.maxlen		=	sizeof(int),
2931 		.mode		=	0644,
2932 		.proc_handler	=	proc_dointvec_jiffies,
2933 	},
2934 	{
2935 		.procname	=	"gc_interval",
2936 		.data		=	&init_net.ipv6.sysctl.ip6_rt_gc_interval,
2937 		.maxlen		=	sizeof(int),
2938 		.mode		=	0644,
2939 		.proc_handler	=	proc_dointvec_jiffies,
2940 	},
2941 	{
2942 		.procname	=	"gc_elasticity",
2943 		.data		=	&init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
2944 		.maxlen		=	sizeof(int),
2945 		.mode		=	0644,
2946 		.proc_handler	=	proc_dointvec,
2947 	},
2948 	{
2949 		.procname	=	"mtu_expires",
2950 		.data		=	&init_net.ipv6.sysctl.ip6_rt_mtu_expires,
2951 		.maxlen		=	sizeof(int),
2952 		.mode		=	0644,
2953 		.proc_handler	=	proc_dointvec_jiffies,
2954 	},
2955 	{
2956 		.procname	=	"min_adv_mss",
2957 		.data		=	&init_net.ipv6.sysctl.ip6_rt_min_advmss,
2958 		.maxlen		=	sizeof(int),
2959 		.mode		=	0644,
2960 		.proc_handler	=	proc_dointvec,
2961 	},
2962 	{
2963 		.procname	=	"gc_min_interval_ms",
2964 		.data		=	&init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2965 		.maxlen		=	sizeof(int),
2966 		.mode		=	0644,
2967 		.proc_handler	=	proc_dointvec_ms_jiffies,
2968 	},
2969 	{ }
2970 };
2971 
2972 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
2973 {
2974 	struct ctl_table *table;
2975 
2976 	table = kmemdup(ipv6_route_table_template,
2977 			sizeof(ipv6_route_table_template),
2978 			GFP_KERNEL);
2979 
2980 	if (table) {
2981 		table[0].data = &net->ipv6.sysctl.flush_delay;
2982 		table[0].extra1 = net;
2983 		table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
2984 		table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2985 		table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2986 		table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2987 		table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2988 		table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2989 		table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2990 		table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
2991 		table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2992 
2993 		/* Don't export sysctls to unprivileged users */
2994 		if (net->user_ns != &init_user_ns)
2995 			table[0].procname = NULL;
2996 	}
2997 
2998 	return table;
2999 }
3000 #endif
3001 
3002 static int __net_init ip6_route_net_init(struct net *net)
3003 {
3004 	int ret = -ENOMEM;
3005 
3006 	memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3007 	       sizeof(net->ipv6.ip6_dst_ops));
3008 
3009 	if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3010 		goto out_ip6_dst_ops;
3011 
3012 	net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3013 					   sizeof(*net->ipv6.ip6_null_entry),
3014 					   GFP_KERNEL);
3015 	if (!net->ipv6.ip6_null_entry)
3016 		goto out_ip6_dst_entries;
3017 	net->ipv6.ip6_null_entry->dst.path =
3018 		(struct dst_entry *)net->ipv6.ip6_null_entry;
3019 	net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3020 	dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3021 			 ip6_template_metrics, true);
3022 
3023 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3024 	net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3025 					       sizeof(*net->ipv6.ip6_prohibit_entry),
3026 					       GFP_KERNEL);
3027 	if (!net->ipv6.ip6_prohibit_entry)
3028 		goto out_ip6_null_entry;
3029 	net->ipv6.ip6_prohibit_entry->dst.path =
3030 		(struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3031 	net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3032 	dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3033 			 ip6_template_metrics, true);
3034 
3035 	net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3036 					       sizeof(*net->ipv6.ip6_blk_hole_entry),
3037 					       GFP_KERNEL);
3038 	if (!net->ipv6.ip6_blk_hole_entry)
3039 		goto out_ip6_prohibit_entry;
3040 	net->ipv6.ip6_blk_hole_entry->dst.path =
3041 		(struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3042 	net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3043 	dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3044 			 ip6_template_metrics, true);
3045 #endif
3046 
3047 	net->ipv6.sysctl.flush_delay = 0;
3048 	net->ipv6.sysctl.ip6_rt_max_size = 4096;
3049 	net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3050 	net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3051 	net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3052 	net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3053 	net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3054 	net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3055 
3056 	net->ipv6.ip6_rt_gc_expire = 30*HZ;
3057 
3058 	ret = 0;
3059 out:
3060 	return ret;
3061 
3062 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3063 out_ip6_prohibit_entry:
3064 	kfree(net->ipv6.ip6_prohibit_entry);
3065 out_ip6_null_entry:
3066 	kfree(net->ipv6.ip6_null_entry);
3067 #endif
3068 out_ip6_dst_entries:
3069 	dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3070 out_ip6_dst_ops:
3071 	goto out;
3072 }
3073 
3074 static void __net_exit ip6_route_net_exit(struct net *net)
3075 {
3076 	kfree(net->ipv6.ip6_null_entry);
3077 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3078 	kfree(net->ipv6.ip6_prohibit_entry);
3079 	kfree(net->ipv6.ip6_blk_hole_entry);
3080 #endif
3081 	dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3082 }
3083 
3084 static int __net_init ip6_route_net_init_late(struct net *net)
3085 {
3086 #ifdef CONFIG_PROC_FS
3087 	proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3088 	proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3089 #endif
3090 	return 0;
3091 }
3092 
3093 static void __net_exit ip6_route_net_exit_late(struct net *net)
3094 {
3095 #ifdef CONFIG_PROC_FS
3096 	remove_proc_entry("ipv6_route", net->proc_net);
3097 	remove_proc_entry("rt6_stats", net->proc_net);
3098 #endif
3099 }
3100 
3101 static struct pernet_operations ip6_route_net_ops = {
3102 	.init = ip6_route_net_init,
3103 	.exit = ip6_route_net_exit,
3104 };
3105 
3106 static int __net_init ipv6_inetpeer_init(struct net *net)
3107 {
3108 	struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3109 
3110 	if (!bp)
3111 		return -ENOMEM;
3112 	inet_peer_base_init(bp);
3113 	net->ipv6.peers = bp;
3114 	return 0;
3115 }
3116 
3117 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3118 {
3119 	struct inet_peer_base *bp = net->ipv6.peers;
3120 
3121 	net->ipv6.peers = NULL;
3122 	inetpeer_invalidate_tree(bp);
3123 	kfree(bp);
3124 }
3125 
3126 static struct pernet_operations ipv6_inetpeer_ops = {
3127 	.init	=	ipv6_inetpeer_init,
3128 	.exit	=	ipv6_inetpeer_exit,
3129 };
3130 
3131 static struct pernet_operations ip6_route_net_late_ops = {
3132 	.init = ip6_route_net_init_late,
3133 	.exit = ip6_route_net_exit_late,
3134 };
3135 
3136 static struct notifier_block ip6_route_dev_notifier = {
3137 	.notifier_call = ip6_route_dev_notify,
3138 	.priority = 0,
3139 };
3140 
3141 int __init ip6_route_init(void)
3142 {
3143 	int ret;
3144 
3145 	ret = -ENOMEM;
3146 	ip6_dst_ops_template.kmem_cachep =
3147 		kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3148 				  SLAB_HWCACHE_ALIGN, NULL);
3149 	if (!ip6_dst_ops_template.kmem_cachep)
3150 		goto out;
3151 
3152 	ret = dst_entries_init(&ip6_dst_blackhole_ops);
3153 	if (ret)
3154 		goto out_kmem_cache;
3155 
3156 	ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3157 	if (ret)
3158 		goto out_dst_entries;
3159 
3160 	ret = register_pernet_subsys(&ip6_route_net_ops);
3161 	if (ret)
3162 		goto out_register_inetpeer;
3163 
3164 	ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3165 
3166 	/* Registering of the loopback is done before this portion of code,
3167 	 * the loopback reference in rt6_info will not be taken, do it
3168 	 * manually for init_net */
3169 	init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3170 	init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3171   #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3172 	init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3173 	init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3174 	init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3175 	init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3176   #endif
3177 	ret = fib6_init();
3178 	if (ret)
3179 		goto out_register_subsys;
3180 
3181 	ret = xfrm6_init();
3182 	if (ret)
3183 		goto out_fib6_init;
3184 
3185 	ret = fib6_rules_init();
3186 	if (ret)
3187 		goto xfrm6_init;
3188 
3189 	ret = register_pernet_subsys(&ip6_route_net_late_ops);
3190 	if (ret)
3191 		goto fib6_rules_init;
3192 
3193 	ret = -ENOBUFS;
3194 	if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3195 	    __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3196 	    __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3197 		goto out_register_late_subsys;
3198 
3199 	ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3200 	if (ret)
3201 		goto out_register_late_subsys;
3202 
3203 out:
3204 	return ret;
3205 
3206 out_register_late_subsys:
3207 	unregister_pernet_subsys(&ip6_route_net_late_ops);
3208 fib6_rules_init:
3209 	fib6_rules_cleanup();
3210 xfrm6_init:
3211 	xfrm6_fini();
3212 out_fib6_init:
3213 	fib6_gc_cleanup();
3214 out_register_subsys:
3215 	unregister_pernet_subsys(&ip6_route_net_ops);
3216 out_register_inetpeer:
3217 	unregister_pernet_subsys(&ipv6_inetpeer_ops);
3218 out_dst_entries:
3219 	dst_entries_destroy(&ip6_dst_blackhole_ops);
3220 out_kmem_cache:
3221 	kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3222 	goto out;
3223 }
3224 
3225 void ip6_route_cleanup(void)
3226 {
3227 	unregister_netdevice_notifier(&ip6_route_dev_notifier);
3228 	unregister_pernet_subsys(&ip6_route_net_late_ops);
3229 	fib6_rules_cleanup();
3230 	xfrm6_fini();
3231 	fib6_gc_cleanup();
3232 	unregister_pernet_subsys(&ipv6_inetpeer_ops);
3233 	unregister_pernet_subsys(&ip6_route_net_ops);
3234 	dst_entries_destroy(&ip6_dst_blackhole_ops);
3235 	kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3236 }
3237