1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Linux IPv6 multicast routing support for BSD pim6sd
4 * Based on net/ipv4/ipmr.c.
5 *
6 * (c) 2004 Mickael Hoerdt, <hoerdt@clarinet.u-strasbg.fr>
7 * LSIIT Laboratory, Strasbourg, France
8 * (c) 2004 Jean-Philippe Andriot, <jean-philippe.andriot@6WIND.com>
9 * 6WIND, Paris, France
10 * Copyright (C)2007,2008 USAGI/WIDE Project
11 * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
12 */
13
14 #include <linux/uaccess.h>
15 #include <linux/types.h>
16 #include <linux/sched.h>
17 #include <linux/errno.h>
18 #include <linux/mm.h>
19 #include <linux/kernel.h>
20 #include <linux/fcntl.h>
21 #include <linux/stat.h>
22 #include <linux/socket.h>
23 #include <linux/inet.h>
24 #include <linux/netdevice.h>
25 #include <linux/inetdevice.h>
26 #include <linux/proc_fs.h>
27 #include <linux/seq_file.h>
28 #include <linux/init.h>
29 #include <linux/compat.h>
30 #include <linux/rhashtable.h>
31 #include <net/protocol.h>
32 #include <linux/skbuff.h>
33 #include <net/raw.h>
34 #include <linux/notifier.h>
35 #include <linux/if_arp.h>
36 #include <net/checksum.h>
37 #include <net/netlink.h>
38 #include <net/fib_rules.h>
39
40 #include <net/ipv6.h>
41 #include <net/ip6_route.h>
42 #include <linux/mroute6.h>
43 #include <linux/pim.h>
44 #include <net/addrconf.h>
45 #include <linux/netfilter_ipv6.h>
46 #include <linux/export.h>
47 #include <net/ip6_checksum.h>
48 #include <linux/netconf.h>
49 #include <net/ip_tunnels.h>
50
51 #include <linux/nospec.h>
52
53 struct ip6mr_rule {
54 struct fib_rule common;
55 };
56
57 struct ip6mr_result {
58 struct mr_table *mrt;
59 };
60
61 /* Big lock, protecting vif table, mrt cache and mroute socket state.
62 Note that the changes are semaphored via rtnl_lock.
63 */
64
65 static DEFINE_SPINLOCK(mrt_lock);
66
67 static struct net_device *vif_dev_read(const struct vif_device *vif)
68 {
69 return rcu_dereference(vif->dev);
70 }
71
72 /* Multicast router control variables */
73
74 /* Special spinlock for queue of unresolved entries */
75 static DEFINE_SPINLOCK(mfc_unres_lock);
76
77 /* We return to original Alan's scheme. Hash table of resolved
78 entries is changed only in process context and protected
79 with weak lock mrt_lock. Queue of unresolved entries is protected
80 with strong spinlock mfc_unres_lock.
81
82 In this case data path is free of exclusive locks at all.
83 */
84
85 static struct kmem_cache *mrt_cachep __read_mostly;
86
87 static struct mr_table *ip6mr_new_table(struct net *net, u32 id);
88 static void ip6mr_free_table(struct mr_table *mrt);
89
90 static void ip6_mr_forward(struct net *net, struct mr_table *mrt,
91 struct net_device *dev, struct sk_buff *skb,
92 struct mfc6_cache *cache);
93 static int ip6mr_cache_report(const struct mr_table *mrt, struct sk_buff *pkt,
94 mifi_t mifi, int assert);
95 static void mr6_netlink_event(struct mr_table *mrt, struct mfc6_cache *mfc,
96 int cmd);
97 static void mrt6msg_netlink_event(const struct mr_table *mrt, struct sk_buff *pkt);
98 static int ip6mr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
99 struct netlink_ext_ack *extack);
100 static int ip6mr_rtm_dumproute(struct sk_buff *skb,
101 struct netlink_callback *cb);
102 static void mroute_clean_tables(struct mr_table *mrt, int flags);
103 static void ipmr_expire_process(struct timer_list *t);
104
105 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
106 #define ip6mr_for_each_table(mrt, net) \
107 list_for_each_entry_rcu(mrt, &net->ipv6.mr6_tables, list, \
108 lockdep_rtnl_is_held() || \
109 list_empty(&net->ipv6.mr6_tables))
110
111 static struct mr_table *ip6mr_mr_table_iter(struct net *net,
112 struct mr_table *mrt)
113 {
114 struct mr_table *ret;
115
116 if (!mrt)
117 ret = list_entry_rcu(net->ipv6.mr6_tables.next,
118 struct mr_table, list);
119 else
120 ret = list_entry_rcu(mrt->list.next,
121 struct mr_table, list);
122
123 if (&ret->list == &net->ipv6.mr6_tables)
124 return NULL;
125 return ret;
126 }
127
128 static struct mr_table *ip6mr_get_table(struct net *net, u32 id)
129 {
130 struct mr_table *mrt;
131
132 ip6mr_for_each_table(mrt, net) {
133 if (mrt->id == id)
134 return mrt;
135 }
136 return NULL;
137 }
138
139 static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
140 struct mr_table **mrt)
141 {
142 int err;
143 struct ip6mr_result res;
144 struct fib_lookup_arg arg = {
145 .result = &res,
146 .flags = FIB_LOOKUP_NOREF,
147 };
148
149 /* update flow if oif or iif point to device enslaved to l3mdev */
150 l3mdev_update_flow(net, flowi6_to_flowi(flp6));
151
152 err = fib_rules_lookup(net->ipv6.mr6_rules_ops,
153 flowi6_to_flowi(flp6), 0, &arg);
154 if (err < 0)
155 return err;
156 *mrt = res.mrt;
157 return 0;
158 }
159
160 static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp,
161 int flags, struct fib_lookup_arg *arg)
162 {
163 struct ip6mr_result *res = arg->result;
164 struct mr_table *mrt;
165
166 switch (rule->action) {
167 case FR_ACT_TO_TBL:
168 break;
169 case FR_ACT_UNREACHABLE:
170 return -ENETUNREACH;
171 case FR_ACT_PROHIBIT:
172 return -EACCES;
173 case FR_ACT_BLACKHOLE:
174 default:
175 return -EINVAL;
176 }
177
178 arg->table = fib_rule_get_table(rule, arg);
179
180 mrt = ip6mr_get_table(rule->fr_net, arg->table);
181 if (!mrt)
182 return -EAGAIN;
183 res->mrt = mrt;
184 return 0;
185 }
186
187 static int ip6mr_rule_match(struct fib_rule *rule, struct flowi *flp, int flags)
188 {
189 return 1;
190 }
191
192 static int ip6mr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
193 struct fib_rule_hdr *frh, struct nlattr **tb,
194 struct netlink_ext_ack *extack)
195 {
196 return 0;
197 }
198
199 static int ip6mr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
200 struct nlattr **tb)
201 {
202 return 1;
203 }
204
205 static int ip6mr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
206 struct fib_rule_hdr *frh)
207 {
208 frh->dst_len = 0;
209 frh->src_len = 0;
210 frh->tos = 0;
211 return 0;
212 }
213
214 static const struct fib_rules_ops __net_initconst ip6mr_rules_ops_template = {
215 .family = RTNL_FAMILY_IP6MR,
216 .rule_size = sizeof(struct ip6mr_rule),
217 .addr_size = sizeof(struct in6_addr),
218 .action = ip6mr_rule_action,
219 .match = ip6mr_rule_match,
220 .configure = ip6mr_rule_configure,
221 .compare = ip6mr_rule_compare,
222 .fill = ip6mr_rule_fill,
223 .nlgroup = RTNLGRP_IPV6_RULE,
224 .owner = THIS_MODULE,
225 };
226
227 static int __net_init ip6mr_rules_init(struct net *net)
228 {
229 struct fib_rules_ops *ops;
230 struct mr_table *mrt;
231 int err;
232
233 ops = fib_rules_register(&ip6mr_rules_ops_template, net);
234 if (IS_ERR(ops))
235 return PTR_ERR(ops);
236
237 INIT_LIST_HEAD(&net->ipv6.mr6_tables);
238
239 mrt = ip6mr_new_table(net, RT6_TABLE_DFLT);
240 if (IS_ERR(mrt)) {
241 err = PTR_ERR(mrt);
242 goto err1;
243 }
244
245 err = fib_default_rule_add(ops, 0x7fff, RT6_TABLE_DFLT);
246 if (err < 0)
247 goto err2;
248
249 net->ipv6.mr6_rules_ops = ops;
250 return 0;
251
252 err2:
253 rtnl_lock();
254 ip6mr_free_table(mrt);
255 rtnl_unlock();
256 err1:
257 fib_rules_unregister(ops);
258 return err;
259 }
260
261 static void __net_exit ip6mr_rules_exit(struct net *net)
262 {
263 struct mr_table *mrt, *next;
264
265 ASSERT_RTNL();
266 list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) {
267 list_del(&mrt->list);
268 ip6mr_free_table(mrt);
269 }
270 fib_rules_unregister(net->ipv6.mr6_rules_ops);
271 }
272
273 static int ip6mr_rules_dump(struct net *net, struct notifier_block *nb,
274 struct netlink_ext_ack *extack)
275 {
276 return fib_rules_dump(net, nb, RTNL_FAMILY_IP6MR, extack);
277 }
278
279 static unsigned int ip6mr_rules_seq_read(struct net *net)
280 {
281 return fib_rules_seq_read(net, RTNL_FAMILY_IP6MR);
282 }
283
284 bool ip6mr_rule_default(const struct fib_rule *rule)
285 {
286 return fib_rule_matchall(rule) && rule->action == FR_ACT_TO_TBL &&
287 rule->table == RT6_TABLE_DFLT && !rule->l3mdev;
288 }
289 EXPORT_SYMBOL(ip6mr_rule_default);
290 #else
291 #define ip6mr_for_each_table(mrt, net) \
292 for (mrt = net->ipv6.mrt6; mrt; mrt = NULL)
293
294 static struct mr_table *ip6mr_mr_table_iter(struct net *net,
295 struct mr_table *mrt)
296 {
297 if (!mrt)
298 return net->ipv6.mrt6;
299 return NULL;
300 }
301
302 static struct mr_table *ip6mr_get_table(struct net *net, u32 id)
303 {
304 return net->ipv6.mrt6;
305 }
306
307 static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
308 struct mr_table **mrt)
309 {
310 *mrt = net->ipv6.mrt6;
311 return 0;
312 }
313
314 static int __net_init ip6mr_rules_init(struct net *net)
315 {
316 struct mr_table *mrt;
317
318 mrt = ip6mr_new_table(net, RT6_TABLE_DFLT);
319 if (IS_ERR(mrt))
320 return PTR_ERR(mrt);
321 net->ipv6.mrt6 = mrt;
322 return 0;
323 }
324
325 static void __net_exit ip6mr_rules_exit(struct net *net)
326 {
327 ASSERT_RTNL();
328 ip6mr_free_table(net->ipv6.mrt6);
329 net->ipv6.mrt6 = NULL;
330 }
331
332 static int ip6mr_rules_dump(struct net *net, struct notifier_block *nb,
333 struct netlink_ext_ack *extack)
334 {
335 return 0;
336 }
337
338 static unsigned int ip6mr_rules_seq_read(struct net *net)
339 {
340 return 0;
341 }
342 #endif
343
344 static int ip6mr_hash_cmp(struct rhashtable_compare_arg *arg,
345 const void *ptr)
346 {
347 const struct mfc6_cache_cmp_arg *cmparg = arg->key;
348 struct mfc6_cache *c = (struct mfc6_cache *)ptr;
349
350 return !ipv6_addr_equal(&c->mf6c_mcastgrp, &cmparg->mf6c_mcastgrp) ||
351 !ipv6_addr_equal(&c->mf6c_origin, &cmparg->mf6c_origin);
352 }
353
354 static const struct rhashtable_params ip6mr_rht_params = {
355 .head_offset = offsetof(struct mr_mfc, mnode),
356 .key_offset = offsetof(struct mfc6_cache, cmparg),
357 .key_len = sizeof(struct mfc6_cache_cmp_arg),
358 .nelem_hint = 3,
359 .obj_cmpfn = ip6mr_hash_cmp,
360 .automatic_shrinking = true,
361 };
362
363 static void ip6mr_new_table_set(struct mr_table *mrt,
364 struct net *net)
365 {
366 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
367 list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables);
368 #endif
369 }
370
371 static struct mfc6_cache_cmp_arg ip6mr_mr_table_ops_cmparg_any = {
372 .mf6c_origin = IN6ADDR_ANY_INIT,
373 .mf6c_mcastgrp = IN6ADDR_ANY_INIT,
374 };
375
376 static struct mr_table_ops ip6mr_mr_table_ops = {
377 .rht_params = &ip6mr_rht_params,
378 .cmparg_any = &ip6mr_mr_table_ops_cmparg_any,
379 };
380
381 static struct mr_table *ip6mr_new_table(struct net *net, u32 id)
382 {
383 struct mr_table *mrt;
384
385 mrt = ip6mr_get_table(net, id);
386 if (mrt)
387 return mrt;
388
389 return mr_table_alloc(net, id, &ip6mr_mr_table_ops,
390 ipmr_expire_process, ip6mr_new_table_set);
391 }
392
393 static void ip6mr_free_table(struct mr_table *mrt)
394 {
395 timer_shutdown_sync(&mrt->ipmr_expire_timer);
396 mroute_clean_tables(mrt, MRT6_FLUSH_MIFS | MRT6_FLUSH_MIFS_STATIC |
397 MRT6_FLUSH_MFC | MRT6_FLUSH_MFC_STATIC);
398 rhltable_destroy(&mrt->mfc_hash);
399 kfree(mrt);
400 }
401
402 #ifdef CONFIG_PROC_FS
403 /* The /proc interfaces to multicast routing
404 * /proc/ip6_mr_cache /proc/ip6_mr_vif
405 */
406
407 static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
408 __acquires(RCU)
409 {
410 struct mr_vif_iter *iter = seq->private;
411 struct net *net = seq_file_net(seq);
412 struct mr_table *mrt;
413
414 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
415 if (!mrt)
416 return ERR_PTR(-ENOENT);
417
418 iter->mrt = mrt;
419
420 rcu_read_lock();
421 return mr_vif_seq_start(seq, pos);
422 }
423
424 static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v)
425 __releases(RCU)
426 {
427 rcu_read_unlock();
428 }
429
430 static int ip6mr_vif_seq_show(struct seq_file *seq, void *v)
431 {
432 struct mr_vif_iter *iter = seq->private;
433 struct mr_table *mrt = iter->mrt;
434
435 if (v == SEQ_START_TOKEN) {
436 seq_puts(seq,
437 "Interface BytesIn PktsIn BytesOut PktsOut Flags\n");
438 } else {
439 const struct vif_device *vif = v;
440 const struct net_device *vif_dev;
441 const char *name;
442
443 vif_dev = vif_dev_read(vif);
444 name = vif_dev ? vif_dev->name : "none";
445
446 seq_printf(seq,
447 "%2td %-10s %8ld %7ld %8ld %7ld %05X\n",
448 vif - mrt->vif_table,
449 name, vif->bytes_in, vif->pkt_in,
450 vif->bytes_out, vif->pkt_out,
451 vif->flags);
452 }
453 return 0;
454 }
455
456 static const struct seq_operations ip6mr_vif_seq_ops = {
457 .start = ip6mr_vif_seq_start,
458 .next = mr_vif_seq_next,
459 .stop = ip6mr_vif_seq_stop,
460 .show = ip6mr_vif_seq_show,
461 };
462
463 static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
464 {
465 struct net *net = seq_file_net(seq);
466 struct mr_table *mrt;
467
468 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
469 if (!mrt)
470 return ERR_PTR(-ENOENT);
471
472 return mr_mfc_seq_start(seq, pos, mrt, &mfc_unres_lock);
473 }
474
475 static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
476 {
477 int n;
478
479 if (v == SEQ_START_TOKEN) {
480 seq_puts(seq,
481 "Group "
482 "Origin "
483 "Iif Pkts Bytes Wrong Oifs\n");
484 } else {
485 const struct mfc6_cache *mfc = v;
486 const struct mr_mfc_iter *it = seq->private;
487 struct mr_table *mrt = it->mrt;
488
489 seq_printf(seq, "%pI6 %pI6 %-3hd",
490 &mfc->mf6c_mcastgrp, &mfc->mf6c_origin,
491 mfc->_c.mfc_parent);
492
493 if (it->cache != &mrt->mfc_unres_queue) {
494 seq_printf(seq, " %8lu %8lu %8lu",
495 mfc->_c.mfc_un.res.pkt,
496 mfc->_c.mfc_un.res.bytes,
497 mfc->_c.mfc_un.res.wrong_if);
498 for (n = mfc->_c.mfc_un.res.minvif;
499 n < mfc->_c.mfc_un.res.maxvif; n++) {
500 if (VIF_EXISTS(mrt, n) &&
501 mfc->_c.mfc_un.res.ttls[n] < 255)
502 seq_printf(seq,
503 " %2d:%-3d", n,
504 mfc->_c.mfc_un.res.ttls[n]);
505 }
506 } else {
507 /* unresolved mfc_caches don't contain
508 * pkt, bytes and wrong_if values
509 */
510 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
511 }
512 seq_putc(seq, '\n');
513 }
514 return 0;
515 }
516
517 static const struct seq_operations ipmr_mfc_seq_ops = {
518 .start = ipmr_mfc_seq_start,
519 .next = mr_mfc_seq_next,
520 .stop = mr_mfc_seq_stop,
521 .show = ipmr_mfc_seq_show,
522 };
523 #endif
524
525 #ifdef CONFIG_IPV6_PIMSM_V2
526
527 static int pim6_rcv(struct sk_buff *skb)
528 {
529 struct pimreghdr *pim;
530 struct ipv6hdr *encap;
531 struct net_device *reg_dev = NULL;
532 struct net *net = dev_net(skb->dev);
533 struct mr_table *mrt;
534 struct flowi6 fl6 = {
535 .flowi6_iif = skb->dev->ifindex,
536 .flowi6_mark = skb->mark,
537 };
538 int reg_vif_num;
539
540 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap)))
541 goto drop;
542
543 pim = (struct pimreghdr *)skb_transport_header(skb);
544 if (pim->type != ((PIM_VERSION << 4) | PIM_TYPE_REGISTER) ||
545 (pim->flags & PIM_NULL_REGISTER) ||
546 (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
547 sizeof(*pim), IPPROTO_PIM,
548 csum_partial((void *)pim, sizeof(*pim), 0)) &&
549 csum_fold(skb_checksum(skb, 0, skb->len, 0))))
550 goto drop;
551
552 /* check if the inner packet is destined to mcast group */
553 encap = (struct ipv6hdr *)(skb_transport_header(skb) +
554 sizeof(*pim));
555
556 if (!ipv6_addr_is_multicast(&encap->daddr) ||
557 encap->payload_len == 0 ||
558 ntohs(encap->payload_len) + sizeof(*pim) > skb->len)
559 goto drop;
560
561 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
562 goto drop;
563
564 /* Pairs with WRITE_ONCE() in mif6_add()/mif6_delete() */
565 reg_vif_num = READ_ONCE(mrt->mroute_reg_vif_num);
566 if (reg_vif_num >= 0)
567 reg_dev = vif_dev_read(&mrt->vif_table[reg_vif_num]);
568
569 if (!reg_dev)
570 goto drop;
571
572 skb->mac_header = skb->network_header;
573 skb_pull(skb, (u8 *)encap - skb->data);
574 skb_reset_network_header(skb);
575 skb->protocol = htons(ETH_P_IPV6);
576 skb->ip_summed = CHECKSUM_NONE;
577
578 skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
579
580 netif_rx(skb);
581
582 return 0;
583 drop:
584 kfree_skb(skb);
585 return 0;
586 }
587
588 static const struct inet6_protocol pim6_protocol = {
589 .handler = pim6_rcv,
590 };
591
592 /* Service routines creating virtual interfaces: PIMREG */
593
594 static netdev_tx_t reg_vif_xmit(struct sk_buff *skb,
595 struct net_device *dev)
596 {
597 struct net *net = dev_net(dev);
598 struct mr_table *mrt;
599 struct flowi6 fl6 = {
600 .flowi6_oif = dev->ifindex,
601 .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
602 .flowi6_mark = skb->mark,
603 };
604
605 if (!pskb_inet_may_pull(skb))
606 goto tx_err;
607
608 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
609 goto tx_err;
610
611 DEV_STATS_ADD(dev, tx_bytes, skb->len);
612 DEV_STATS_INC(dev, tx_packets);
613 rcu_read_lock();
614 ip6mr_cache_report(mrt, skb, READ_ONCE(mrt->mroute_reg_vif_num),
615 MRT6MSG_WHOLEPKT);
616 rcu_read_unlock();
617 kfree_skb(skb);
618 return NETDEV_TX_OK;
619
620 tx_err:
621 DEV_STATS_INC(dev, tx_errors);
622 kfree_skb(skb);
623 return NETDEV_TX_OK;
624 }
625
626 static int reg_vif_get_iflink(const struct net_device *dev)
627 {
628 return 0;
629 }
630
631 static const struct net_device_ops reg_vif_netdev_ops = {
632 .ndo_start_xmit = reg_vif_xmit,
633 .ndo_get_iflink = reg_vif_get_iflink,
634 };
635
636 static void reg_vif_setup(struct net_device *dev)
637 {
638 dev->type = ARPHRD_PIMREG;
639 dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8;
640 dev->flags = IFF_NOARP;
641 dev->netdev_ops = ®_vif_netdev_ops;
642 dev->needs_free_netdev = true;
643 dev->features |= NETIF_F_NETNS_LOCAL;
644 }
645
646 static struct net_device *ip6mr_reg_vif(struct net *net, struct mr_table *mrt)
647 {
648 struct net_device *dev;
649 char name[IFNAMSIZ];
650
651 if (mrt->id == RT6_TABLE_DFLT)
652 sprintf(name, "pim6reg");
653 else
654 sprintf(name, "pim6reg%u", mrt->id);
655
656 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup);
657 if (!dev)
658 return NULL;
659
660 dev_net_set(dev, net);
661
662 if (register_netdevice(dev)) {
663 free_netdev(dev);
664 return NULL;
665 }
666
667 if (dev_open(dev, NULL))
668 goto failure;
669
670 dev_hold(dev);
671 return dev;
672
673 failure:
674 unregister_netdevice(dev);
675 return NULL;
676 }
677 #endif
678
679 static int call_ip6mr_vif_entry_notifiers(struct net *net,
680 enum fib_event_type event_type,
681 struct vif_device *vif,
682 struct net_device *vif_dev,
683 mifi_t vif_index, u32 tb_id)
684 {
685 return mr_call_vif_notifiers(net, RTNL_FAMILY_IP6MR, event_type,
686 vif, vif_dev, vif_index, tb_id,
687 &net->ipv6.ipmr_seq);
688 }
689
690 static int call_ip6mr_mfc_entry_notifiers(struct net *net,
691 enum fib_event_type event_type,
692 struct mfc6_cache *mfc, u32 tb_id)
693 {
694 return mr_call_mfc_notifiers(net, RTNL_FAMILY_IP6MR, event_type,
695 &mfc->_c, tb_id, &net->ipv6.ipmr_seq);
696 }
697
698 /* Delete a VIF entry */
699 static int mif6_delete(struct mr_table *mrt, int vifi, int notify,
700 struct list_head *head)
701 {
702 struct vif_device *v;
703 struct net_device *dev;
704 struct inet6_dev *in6_dev;
705
706 if (vifi < 0 || vifi >= mrt->maxvif)
707 return -EADDRNOTAVAIL;
708
709 v = &mrt->vif_table[vifi];
710
711 dev = rtnl_dereference(v->dev);
712 if (!dev)
713 return -EADDRNOTAVAIL;
714
715 call_ip6mr_vif_entry_notifiers(read_pnet(&mrt->net),
716 FIB_EVENT_VIF_DEL, v, dev,
717 vifi, mrt->id);
718 spin_lock(&mrt_lock);
719 RCU_INIT_POINTER(v->dev, NULL);
720
721 #ifdef CONFIG_IPV6_PIMSM_V2
722 if (vifi == mrt->mroute_reg_vif_num) {
723 /* Pairs with READ_ONCE() in ip6mr_cache_report() and reg_vif_xmit() */
724 WRITE_ONCE(mrt->mroute_reg_vif_num, -1);
725 }
726 #endif
727
728 if (vifi + 1 == mrt->maxvif) {
729 int tmp;
730 for (tmp = vifi - 1; tmp >= 0; tmp--) {
731 if (VIF_EXISTS(mrt, tmp))
732 break;
733 }
734 WRITE_ONCE(mrt->maxvif, tmp + 1);
735 }
736
737 spin_unlock(&mrt_lock);
738
739 dev_set_allmulti(dev, -1);
740
741 in6_dev = __in6_dev_get(dev);
742 if (in6_dev) {
743 atomic_dec(&in6_dev->cnf.mc_forwarding);
744 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
745 NETCONFA_MC_FORWARDING,
746 dev->ifindex, &in6_dev->cnf);
747 }
748
749 if ((v->flags & MIFF_REGISTER) && !notify)
750 unregister_netdevice_queue(dev, head);
751
752 netdev_put(dev, &v->dev_tracker);
753 return 0;
754 }
755
756 static inline void ip6mr_cache_free_rcu(struct rcu_head *head)
757 {
758 struct mr_mfc *c = container_of(head, struct mr_mfc, rcu);
759
760 kmem_cache_free(mrt_cachep, (struct mfc6_cache *)c);
761 }
762
763 static inline void ip6mr_cache_free(struct mfc6_cache *c)
764 {
765 call_rcu(&c->_c.rcu, ip6mr_cache_free_rcu);
766 }
767
768 /* Destroy an unresolved cache entry, killing queued skbs
769 and reporting error to netlink readers.
770 */
771
772 static void ip6mr_destroy_unres(struct mr_table *mrt, struct mfc6_cache *c)
773 {
774 struct net *net = read_pnet(&mrt->net);
775 struct sk_buff *skb;
776
777 atomic_dec(&mrt->cache_resolve_queue_len);
778
779 while ((skb = skb_dequeue(&c->_c.mfc_un.unres.unresolved)) != NULL) {
780 if (ipv6_hdr(skb)->version == 0) {
781 struct nlmsghdr *nlh = skb_pull(skb,
782 sizeof(struct ipv6hdr));
783 nlh->nlmsg_type = NLMSG_ERROR;
784 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
785 skb_trim(skb, nlh->nlmsg_len);
786 ((struct nlmsgerr *)nlmsg_data(nlh))->error = -ETIMEDOUT;
787 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
788 } else
789 kfree_skb(skb);
790 }
791
792 ip6mr_cache_free(c);
793 }
794
795
796 /* Timer process for all the unresolved queue. */
797
798 static void ipmr_do_expire_process(struct mr_table *mrt)
799 {
800 unsigned long now = jiffies;
801 unsigned long expires = 10 * HZ;
802 struct mr_mfc *c, *next;
803
804 list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
805 if (time_after(c->mfc_un.unres.expires, now)) {
806 /* not yet... */
807 unsigned long interval = c->mfc_un.unres.expires - now;
808 if (interval < expires)
809 expires = interval;
810 continue;
811 }
812
813 list_del(&c->list);
814 mr6_netlink_event(mrt, (struct mfc6_cache *)c, RTM_DELROUTE);
815 ip6mr_destroy_unres(mrt, (struct mfc6_cache *)c);
816 }
817
818 if (!list_empty(&mrt->mfc_unres_queue))
819 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
820 }
821
822 static void ipmr_expire_process(struct timer_list *t)
823 {
824 struct mr_table *mrt = from_timer(mrt, t, ipmr_expire_timer);
825
826 if (!spin_trylock(&mfc_unres_lock)) {
827 mod_timer(&mrt->ipmr_expire_timer, jiffies + 1);
828 return;
829 }
830
831 if (!list_empty(&mrt->mfc_unres_queue))
832 ipmr_do_expire_process(mrt);
833
834 spin_unlock(&mfc_unres_lock);
835 }
836
837 /* Fill oifs list. It is called under locked mrt_lock. */
838
839 static void ip6mr_update_thresholds(struct mr_table *mrt,
840 struct mr_mfc *cache,
841 unsigned char *ttls)
842 {
843 int vifi;
844
845 cache->mfc_un.res.minvif = MAXMIFS;
846 cache->mfc_un.res.maxvif = 0;
847 memset(cache->mfc_un.res.ttls, 255, MAXMIFS);
848
849 for (vifi = 0; vifi < mrt->maxvif; vifi++) {
850 if (VIF_EXISTS(mrt, vifi) &&
851 ttls[vifi] && ttls[vifi] < 255) {
852 cache->mfc_un.res.ttls[vifi] = ttls[vifi];
853 if (cache->mfc_un.res.minvif > vifi)
854 cache->mfc_un.res.minvif = vifi;
855 if (cache->mfc_un.res.maxvif <= vifi)
856 cache->mfc_un.res.maxvif = vifi + 1;
857 }
858 }
859 cache->mfc_un.res.lastuse = jiffies;
860 }
861
862 static int mif6_add(struct net *net, struct mr_table *mrt,
863 struct mif6ctl *vifc, int mrtsock)
864 {
865 int vifi = vifc->mif6c_mifi;
866 struct vif_device *v = &mrt->vif_table[vifi];
867 struct net_device *dev;
868 struct inet6_dev *in6_dev;
869 int err;
870
871 /* Is vif busy ? */
872 if (VIF_EXISTS(mrt, vifi))
873 return -EADDRINUSE;
874
875 switch (vifc->mif6c_flags) {
876 #ifdef CONFIG_IPV6_PIMSM_V2
877 case MIFF_REGISTER:
878 /*
879 * Special Purpose VIF in PIM
880 * All the packets will be sent to the daemon
881 */
882 if (mrt->mroute_reg_vif_num >= 0)
883 return -EADDRINUSE;
884 dev = ip6mr_reg_vif(net, mrt);
885 if (!dev)
886 return -ENOBUFS;
887 err = dev_set_allmulti(dev, 1);
888 if (err) {
889 unregister_netdevice(dev);
890 dev_put(dev);
891 return err;
892 }
893 break;
894 #endif
895 case 0:
896 dev = dev_get_by_index(net, vifc->mif6c_pifi);
897 if (!dev)
898 return -EADDRNOTAVAIL;
899 err = dev_set_allmulti(dev, 1);
900 if (err) {
901 dev_put(dev);
902 return err;
903 }
904 break;
905 default:
906 return -EINVAL;
907 }
908
909 in6_dev = __in6_dev_get(dev);
910 if (in6_dev) {
911 atomic_inc(&in6_dev->cnf.mc_forwarding);
912 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
913 NETCONFA_MC_FORWARDING,
914 dev->ifindex, &in6_dev->cnf);
915 }
916
917 /* Fill in the VIF structures */
918 vif_device_init(v, dev, vifc->vifc_rate_limit, vifc->vifc_threshold,
919 vifc->mif6c_flags | (!mrtsock ? VIFF_STATIC : 0),
920 MIFF_REGISTER);
921
922 /* And finish update writing critical data */
923 spin_lock(&mrt_lock);
924 rcu_assign_pointer(v->dev, dev);
925 netdev_tracker_alloc(dev, &v->dev_tracker, GFP_ATOMIC);
926 #ifdef CONFIG_IPV6_PIMSM_V2
927 if (v->flags & MIFF_REGISTER)
928 WRITE_ONCE(mrt->mroute_reg_vif_num, vifi);
929 #endif
930 if (vifi + 1 > mrt->maxvif)
931 WRITE_ONCE(mrt->maxvif, vifi + 1);
932 spin_unlock(&mrt_lock);
933 call_ip6mr_vif_entry_notifiers(net, FIB_EVENT_VIF_ADD,
934 v, dev, vifi, mrt->id);
935 return 0;
936 }
937
938 static struct mfc6_cache *ip6mr_cache_find(struct mr_table *mrt,
939 const struct in6_addr *origin,
940 const struct in6_addr *mcastgrp)
941 {
942 struct mfc6_cache_cmp_arg arg = {
943 .mf6c_origin = *origin,
944 .mf6c_mcastgrp = *mcastgrp,
945 };
946
947 return mr_mfc_find(mrt, &arg);
948 }
949
950 /* Look for a (*,G) entry */
951 static struct mfc6_cache *ip6mr_cache_find_any(struct mr_table *mrt,
952 struct in6_addr *mcastgrp,
953 mifi_t mifi)
954 {
955 struct mfc6_cache_cmp_arg arg = {
956 .mf6c_origin = in6addr_any,
957 .mf6c_mcastgrp = *mcastgrp,
958 };
959
960 if (ipv6_addr_any(mcastgrp))
961 return mr_mfc_find_any_parent(mrt, mifi);
962 return mr_mfc_find_any(mrt, mifi, &arg);
963 }
964
965 /* Look for a (S,G,iif) entry if parent != -1 */
966 static struct mfc6_cache *
967 ip6mr_cache_find_parent(struct mr_table *mrt,
968 const struct in6_addr *origin,
969 const struct in6_addr *mcastgrp,
970 int parent)
971 {
972 struct mfc6_cache_cmp_arg arg = {
973 .mf6c_origin = *origin,
974 .mf6c_mcastgrp = *mcastgrp,
975 };
976
977 return mr_mfc_find_parent(mrt, &arg, parent);
978 }
979
980 /* Allocate a multicast cache entry */
981 static struct mfc6_cache *ip6mr_cache_alloc(void)
982 {
983 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
984 if (!c)
985 return NULL;
986 c->_c.mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1;
987 c->_c.mfc_un.res.minvif = MAXMIFS;
988 c->_c.free = ip6mr_cache_free_rcu;
989 refcount_set(&c->_c.mfc_un.res.refcount, 1);
990 return c;
991 }
992
993 static struct mfc6_cache *ip6mr_cache_alloc_unres(void)
994 {
995 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
996 if (!c)
997 return NULL;
998 skb_queue_head_init(&c->_c.mfc_un.unres.unresolved);
999 c->_c.mfc_un.unres.expires = jiffies + 10 * HZ;
1000 return c;
1001 }
1002
1003 /*
1004 * A cache entry has gone into a resolved state from queued
1005 */
1006
1007 static void ip6mr_cache_resolve(struct net *net, struct mr_table *mrt,
1008 struct mfc6_cache *uc, struct mfc6_cache *c)
1009 {
1010 struct sk_buff *skb;
1011
1012 /*
1013 * Play the pending entries through our router
1014 */
1015
1016 while ((skb = __skb_dequeue(&uc->_c.mfc_un.unres.unresolved))) {
1017 if (ipv6_hdr(skb)->version == 0) {
1018 struct nlmsghdr *nlh = skb_pull(skb,
1019 sizeof(struct ipv6hdr));
1020
1021 if (mr_fill_mroute(mrt, skb, &c->_c,
1022 nlmsg_data(nlh)) > 0) {
1023 nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh;
1024 } else {
1025 nlh->nlmsg_type = NLMSG_ERROR;
1026 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
1027 skb_trim(skb, nlh->nlmsg_len);
1028 ((struct nlmsgerr *)nlmsg_data(nlh))->error = -EMSGSIZE;
1029 }
1030 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
1031 } else {
1032 rcu_read_lock();
1033 ip6_mr_forward(net, mrt, skb->dev, skb, c);
1034 rcu_read_unlock();
1035 }
1036 }
1037 }
1038
1039 /*
1040 * Bounce a cache query up to pim6sd and netlink.
1041 *
1042 * Called under rcu_read_lock()
1043 */
1044
1045 static int ip6mr_cache_report(const struct mr_table *mrt, struct sk_buff *pkt,
1046 mifi_t mifi, int assert)
1047 {
1048 struct sock *mroute6_sk;
1049 struct sk_buff *skb;
1050 struct mrt6msg *msg;
1051 int ret;
1052
1053 #ifdef CONFIG_IPV6_PIMSM_V2
1054 if (assert == MRT6MSG_WHOLEPKT || assert == MRT6MSG_WRMIFWHOLE)
1055 skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt)
1056 +sizeof(*msg));
1057 else
1058 #endif
1059 skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
1060
1061 if (!skb)
1062 return -ENOBUFS;
1063
1064 /* I suppose that internal messages
1065 * do not require checksums */
1066
1067 skb->ip_summed = CHECKSUM_UNNECESSARY;
1068
1069 #ifdef CONFIG_IPV6_PIMSM_V2
1070 if (assert == MRT6MSG_WHOLEPKT || assert == MRT6MSG_WRMIFWHOLE) {
1071 /* Ugly, but we have no choice with this interface.
1072 Duplicate old header, fix length etc.
1073 And all this only to mangle msg->im6_msgtype and
1074 to set msg->im6_mbz to "mbz" :-)
1075 */
1076 __skb_pull(skb, skb_network_offset(pkt));
1077
1078 skb_push(skb, sizeof(*msg));
1079 skb_reset_transport_header(skb);
1080 msg = (struct mrt6msg *)skb_transport_header(skb);
1081 msg->im6_mbz = 0;
1082 msg->im6_msgtype = assert;
1083 if (assert == MRT6MSG_WRMIFWHOLE)
1084 msg->im6_mif = mifi;
1085 else
1086 msg->im6_mif = READ_ONCE(mrt->mroute_reg_vif_num);
1087 msg->im6_pad = 0;
1088 msg->im6_src = ipv6_hdr(pkt)->saddr;
1089 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1090
1091 skb->ip_summed = CHECKSUM_UNNECESSARY;
1092 } else
1093 #endif
1094 {
1095 /*
1096 * Copy the IP header
1097 */
1098
1099 skb_put(skb, sizeof(struct ipv6hdr));
1100 skb_reset_network_header(skb);
1101 skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr));
1102
1103 /*
1104 * Add our header
1105 */
1106 skb_put(skb, sizeof(*msg));
1107 skb_reset_transport_header(skb);
1108 msg = (struct mrt6msg *)skb_transport_header(skb);
1109
1110 msg->im6_mbz = 0;
1111 msg->im6_msgtype = assert;
1112 msg->im6_mif = mifi;
1113 msg->im6_pad = 0;
1114 msg->im6_src = ipv6_hdr(pkt)->saddr;
1115 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1116
1117 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
1118 skb->ip_summed = CHECKSUM_UNNECESSARY;
1119 }
1120
1121 mroute6_sk = rcu_dereference(mrt->mroute_sk);
1122 if (!mroute6_sk) {
1123 kfree_skb(skb);
1124 return -EINVAL;
1125 }
1126
1127 mrt6msg_netlink_event(mrt, skb);
1128
1129 /* Deliver to user space multicast routing algorithms */
1130 ret = sock_queue_rcv_skb(mroute6_sk, skb);
1131
1132 if (ret < 0) {
1133 net_warn_ratelimited("mroute6: pending queue full, dropping entries\n");
1134 kfree_skb(skb);
1135 }
1136
1137 return ret;
1138 }
1139
1140 /* Queue a packet for resolution. It gets locked cache entry! */
1141 static int ip6mr_cache_unresolved(struct mr_table *mrt, mifi_t mifi,
1142 struct sk_buff *skb, struct net_device *dev)
1143 {
1144 struct mfc6_cache *c;
1145 bool found = false;
1146 int err;
1147
1148 spin_lock_bh(&mfc_unres_lock);
1149 list_for_each_entry(c, &mrt->mfc_unres_queue, _c.list) {
1150 if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
1151 ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) {
1152 found = true;
1153 break;
1154 }
1155 }
1156
1157 if (!found) {
1158 /*
1159 * Create a new entry if allowable
1160 */
1161
1162 c = ip6mr_cache_alloc_unres();
1163 if (!c) {
1164 spin_unlock_bh(&mfc_unres_lock);
1165
1166 kfree_skb(skb);
1167 return -ENOBUFS;
1168 }
1169
1170 /* Fill in the new cache entry */
1171 c->_c.mfc_parent = -1;
1172 c->mf6c_origin = ipv6_hdr(skb)->saddr;
1173 c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr;
1174
1175 /*
1176 * Reflect first query at pim6sd
1177 */
1178 err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE);
1179 if (err < 0) {
1180 /* If the report failed throw the cache entry
1181 out - Brad Parker
1182 */
1183 spin_unlock_bh(&mfc_unres_lock);
1184
1185 ip6mr_cache_free(c);
1186 kfree_skb(skb);
1187 return err;
1188 }
1189
1190 atomic_inc(&mrt->cache_resolve_queue_len);
1191 list_add(&c->_c.list, &mrt->mfc_unres_queue);
1192 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1193
1194 ipmr_do_expire_process(mrt);
1195 }
1196
1197 /* See if we can append the packet */
1198 if (c->_c.mfc_un.unres.unresolved.qlen > 3) {
1199 kfree_skb(skb);
1200 err = -ENOBUFS;
1201 } else {
1202 if (dev) {
1203 skb->dev = dev;
1204 skb->skb_iif = dev->ifindex;
1205 }
1206 skb_queue_tail(&c->_c.mfc_un.unres.unresolved, skb);
1207 err = 0;
1208 }
1209
1210 spin_unlock_bh(&mfc_unres_lock);
1211 return err;
1212 }
1213
1214 /*
1215 * MFC6 cache manipulation by user space
1216 */
1217
1218 static int ip6mr_mfc_delete(struct mr_table *mrt, struct mf6cctl *mfc,
1219 int parent)
1220 {
1221 struct mfc6_cache *c;
1222
1223 /* The entries are added/deleted only under RTNL */
1224 rcu_read_lock();
1225 c = ip6mr_cache_find_parent(mrt, &mfc->mf6cc_origin.sin6_addr,
1226 &mfc->mf6cc_mcastgrp.sin6_addr, parent);
1227 rcu_read_unlock();
1228 if (!c)
1229 return -ENOENT;
1230 rhltable_remove(&mrt->mfc_hash, &c->_c.mnode, ip6mr_rht_params);
1231 list_del_rcu(&c->_c.list);
1232
1233 call_ip6mr_mfc_entry_notifiers(read_pnet(&mrt->net),
1234 FIB_EVENT_ENTRY_DEL, c, mrt->id);
1235 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1236 mr_cache_put(&c->_c);
1237 return 0;
1238 }
1239
1240 static int ip6mr_device_event(struct notifier_block *this,
1241 unsigned long event, void *ptr)
1242 {
1243 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1244 struct net *net = dev_net(dev);
1245 struct mr_table *mrt;
1246 struct vif_device *v;
1247 int ct;
1248
1249 if (event != NETDEV_UNREGISTER)
1250 return NOTIFY_DONE;
1251
1252 ip6mr_for_each_table(mrt, net) {
1253 v = &mrt->vif_table[0];
1254 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1255 if (rcu_access_pointer(v->dev) == dev)
1256 mif6_delete(mrt, ct, 1, NULL);
1257 }
1258 }
1259
1260 return NOTIFY_DONE;
1261 }
1262
1263 static unsigned int ip6mr_seq_read(struct net *net)
1264 {
1265 ASSERT_RTNL();
1266
1267 return net->ipv6.ipmr_seq + ip6mr_rules_seq_read(net);
1268 }
1269
1270 static int ip6mr_dump(struct net *net, struct notifier_block *nb,
1271 struct netlink_ext_ack *extack)
1272 {
1273 return mr_dump(net, nb, RTNL_FAMILY_IP6MR, ip6mr_rules_dump,
1274 ip6mr_mr_table_iter, extack);
1275 }
1276
1277 static struct notifier_block ip6_mr_notifier = {
1278 .notifier_call = ip6mr_device_event
1279 };
1280
1281 static const struct fib_notifier_ops ip6mr_notifier_ops_template = {
1282 .family = RTNL_FAMILY_IP6MR,
1283 .fib_seq_read = ip6mr_seq_read,
1284 .fib_dump = ip6mr_dump,
1285 .owner = THIS_MODULE,
1286 };
1287
1288 static int __net_init ip6mr_notifier_init(struct net *net)
1289 {
1290 struct fib_notifier_ops *ops;
1291
1292 net->ipv6.ipmr_seq = 0;
1293
1294 ops = fib_notifier_ops_register(&ip6mr_notifier_ops_template, net);
1295 if (IS_ERR(ops))
1296 return PTR_ERR(ops);
1297
1298 net->ipv6.ip6mr_notifier_ops = ops;
1299
1300 return 0;
1301 }
1302
1303 static void __net_exit ip6mr_notifier_exit(struct net *net)
1304 {
1305 fib_notifier_ops_unregister(net->ipv6.ip6mr_notifier_ops);
1306 net->ipv6.ip6mr_notifier_ops = NULL;
1307 }
1308
1309 /* Setup for IP multicast routing */
1310 static int __net_init ip6mr_net_init(struct net *net)
1311 {
1312 int err;
1313
1314 err = ip6mr_notifier_init(net);
1315 if (err)
1316 return err;
1317
1318 err = ip6mr_rules_init(net);
1319 if (err < 0)
1320 goto ip6mr_rules_fail;
1321
1322 #ifdef CONFIG_PROC_FS
1323 err = -ENOMEM;
1324 if (!proc_create_net("ip6_mr_vif", 0, net->proc_net, &ip6mr_vif_seq_ops,
1325 sizeof(struct mr_vif_iter)))
1326 goto proc_vif_fail;
1327 if (!proc_create_net("ip6_mr_cache", 0, net->proc_net, &ipmr_mfc_seq_ops,
1328 sizeof(struct mr_mfc_iter)))
1329 goto proc_cache_fail;
1330 #endif
1331
1332 return 0;
1333
1334 #ifdef CONFIG_PROC_FS
1335 proc_cache_fail:
1336 remove_proc_entry("ip6_mr_vif", net->proc_net);
1337 proc_vif_fail:
1338 rtnl_lock();
1339 ip6mr_rules_exit(net);
1340 rtnl_unlock();
1341 #endif
1342 ip6mr_rules_fail:
1343 ip6mr_notifier_exit(net);
1344 return err;
1345 }
1346
1347 static void __net_exit ip6mr_net_exit(struct net *net)
1348 {
1349 #ifdef CONFIG_PROC_FS
1350 remove_proc_entry("ip6_mr_cache", net->proc_net);
1351 remove_proc_entry("ip6_mr_vif", net->proc_net);
1352 #endif
1353 ip6mr_notifier_exit(net);
1354 }
1355
1356 static void __net_exit ip6mr_net_exit_batch(struct list_head *net_list)
1357 {
1358 struct net *net;
1359
1360 rtnl_lock();
1361 list_for_each_entry(net, net_list, exit_list)
1362 ip6mr_rules_exit(net);
1363 rtnl_unlock();
1364 }
1365
1366 static struct pernet_operations ip6mr_net_ops = {
1367 .init = ip6mr_net_init,
1368 .exit = ip6mr_net_exit,
1369 .exit_batch = ip6mr_net_exit_batch,
1370 };
1371
1372 int __init ip6_mr_init(void)
1373 {
1374 int err;
1375
1376 mrt_cachep = KMEM_CACHE(mfc6_cache, SLAB_HWCACHE_ALIGN);
1377 if (!mrt_cachep)
1378 return -ENOMEM;
1379
1380 err = register_pernet_subsys(&ip6mr_net_ops);
1381 if (err)
1382 goto reg_pernet_fail;
1383
1384 err = register_netdevice_notifier(&ip6_mr_notifier);
1385 if (err)
1386 goto reg_notif_fail;
1387 #ifdef CONFIG_IPV6_PIMSM_V2
1388 if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) {
1389 pr_err("%s: can't add PIM protocol\n", __func__);
1390 err = -EAGAIN;
1391 goto add_proto_fail;
1392 }
1393 #endif
1394 err = rtnl_register_module(THIS_MODULE, RTNL_FAMILY_IP6MR, RTM_GETROUTE,
1395 ip6mr_rtm_getroute, ip6mr_rtm_dumproute, 0);
1396 if (err == 0)
1397 return 0;
1398
1399 #ifdef CONFIG_IPV6_PIMSM_V2
1400 inet6_del_protocol(&pim6_protocol, IPPROTO_PIM);
1401 add_proto_fail:
1402 unregister_netdevice_notifier(&ip6_mr_notifier);
1403 #endif
1404 reg_notif_fail:
1405 unregister_pernet_subsys(&ip6mr_net_ops);
1406 reg_pernet_fail:
1407 kmem_cache_destroy(mrt_cachep);
1408 return err;
1409 }
1410
1411 void ip6_mr_cleanup(void)
1412 {
1413 rtnl_unregister(RTNL_FAMILY_IP6MR, RTM_GETROUTE);
1414 #ifdef CONFIG_IPV6_PIMSM_V2
1415 inet6_del_protocol(&pim6_protocol, IPPROTO_PIM);
1416 #endif
1417 unregister_netdevice_notifier(&ip6_mr_notifier);
1418 unregister_pernet_subsys(&ip6mr_net_ops);
1419 kmem_cache_destroy(mrt_cachep);
1420 }
1421
1422 static int ip6mr_mfc_add(struct net *net, struct mr_table *mrt,
1423 struct mf6cctl *mfc, int mrtsock, int parent)
1424 {
1425 unsigned char ttls[MAXMIFS];
1426 struct mfc6_cache *uc, *c;
1427 struct mr_mfc *_uc;
1428 bool found;
1429 int i, err;
1430
1431 if (mfc->mf6cc_parent >= MAXMIFS)
1432 return -ENFILE;
1433
1434 memset(ttls, 255, MAXMIFS);
1435 for (i = 0; i < MAXMIFS; i++) {
1436 if (IF_ISSET(i, &mfc->mf6cc_ifset))
1437 ttls[i] = 1;
1438 }
1439
1440 /* The entries are added/deleted only under RTNL */
1441 rcu_read_lock();
1442 c = ip6mr_cache_find_parent(mrt, &mfc->mf6cc_origin.sin6_addr,
1443 &mfc->mf6cc_mcastgrp.sin6_addr, parent);
1444 rcu_read_unlock();
1445 if (c) {
1446 spin_lock(&mrt_lock);
1447 c->_c.mfc_parent = mfc->mf6cc_parent;
1448 ip6mr_update_thresholds(mrt, &c->_c, ttls);
1449 if (!mrtsock)
1450 c->_c.mfc_flags |= MFC_STATIC;
1451 spin_unlock(&mrt_lock);
1452 call_ip6mr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE,
1453 c, mrt->id);
1454 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1455 return 0;
1456 }
1457
1458 if (!ipv6_addr_any(&mfc->mf6cc_mcastgrp.sin6_addr) &&
1459 !ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr))
1460 return -EINVAL;
1461
1462 c = ip6mr_cache_alloc();
1463 if (!c)
1464 return -ENOMEM;
1465
1466 c->mf6c_origin = mfc->mf6cc_origin.sin6_addr;
1467 c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr;
1468 c->_c.mfc_parent = mfc->mf6cc_parent;
1469 ip6mr_update_thresholds(mrt, &c->_c, ttls);
1470 if (!mrtsock)
1471 c->_c.mfc_flags |= MFC_STATIC;
1472
1473 err = rhltable_insert_key(&mrt->mfc_hash, &c->cmparg, &c->_c.mnode,
1474 ip6mr_rht_params);
1475 if (err) {
1476 pr_err("ip6mr: rhtable insert error %d\n", err);
1477 ip6mr_cache_free(c);
1478 return err;
1479 }
1480 list_add_tail_rcu(&c->_c.list, &mrt->mfc_cache_list);
1481
1482 /* Check to see if we resolved a queued list. If so we
1483 * need to send on the frames and tidy up.
1484 */
1485 found = false;
1486 spin_lock_bh(&mfc_unres_lock);
1487 list_for_each_entry(_uc, &mrt->mfc_unres_queue, list) {
1488 uc = (struct mfc6_cache *)_uc;
1489 if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) &&
1490 ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) {
1491 list_del(&_uc->list);
1492 atomic_dec(&mrt->cache_resolve_queue_len);
1493 found = true;
1494 break;
1495 }
1496 }
1497 if (list_empty(&mrt->mfc_unres_queue))
1498 del_timer(&mrt->ipmr_expire_timer);
1499 spin_unlock_bh(&mfc_unres_lock);
1500
1501 if (found) {
1502 ip6mr_cache_resolve(net, mrt, uc, c);
1503 ip6mr_cache_free(uc);
1504 }
1505 call_ip6mr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_ADD,
1506 c, mrt->id);
1507 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1508 return 0;
1509 }
1510
1511 /*
1512 * Close the multicast socket, and clear the vif tables etc
1513 */
1514
1515 static void mroute_clean_tables(struct mr_table *mrt, int flags)
1516 {
1517 struct mr_mfc *c, *tmp;
1518 LIST_HEAD(list);
1519 int i;
1520
1521 /* Shut down all active vif entries */
1522 if (flags & (MRT6_FLUSH_MIFS | MRT6_FLUSH_MIFS_STATIC)) {
1523 for (i = 0; i < mrt->maxvif; i++) {
1524 if (((mrt->vif_table[i].flags & VIFF_STATIC) &&
1525 !(flags & MRT6_FLUSH_MIFS_STATIC)) ||
1526 (!(mrt->vif_table[i].flags & VIFF_STATIC) && !(flags & MRT6_FLUSH_MIFS)))
1527 continue;
1528 mif6_delete(mrt, i, 0, &list);
1529 }
1530 unregister_netdevice_many(&list);
1531 }
1532
1533 /* Wipe the cache */
1534 if (flags & (MRT6_FLUSH_MFC | MRT6_FLUSH_MFC_STATIC)) {
1535 list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) {
1536 if (((c->mfc_flags & MFC_STATIC) && !(flags & MRT6_FLUSH_MFC_STATIC)) ||
1537 (!(c->mfc_flags & MFC_STATIC) && !(flags & MRT6_FLUSH_MFC)))
1538 continue;
1539 rhltable_remove(&mrt->mfc_hash, &c->mnode, ip6mr_rht_params);
1540 list_del_rcu(&c->list);
1541 call_ip6mr_mfc_entry_notifiers(read_pnet(&mrt->net),
1542 FIB_EVENT_ENTRY_DEL,
1543 (struct mfc6_cache *)c, mrt->id);
1544 mr6_netlink_event(mrt, (struct mfc6_cache *)c, RTM_DELROUTE);
1545 mr_cache_put(c);
1546 }
1547 }
1548
1549 if (flags & MRT6_FLUSH_MFC) {
1550 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1551 spin_lock_bh(&mfc_unres_lock);
1552 list_for_each_entry_safe(c, tmp, &mrt->mfc_unres_queue, list) {
1553 list_del(&c->list);
1554 mr6_netlink_event(mrt, (struct mfc6_cache *)c,
1555 RTM_DELROUTE);
1556 ip6mr_destroy_unres(mrt, (struct mfc6_cache *)c);
1557 }
1558 spin_unlock_bh(&mfc_unres_lock);
1559 }
1560 }
1561 }
1562
1563 static int ip6mr_sk_init(struct mr_table *mrt, struct sock *sk)
1564 {
1565 int err = 0;
1566 struct net *net = sock_net(sk);
1567
1568 rtnl_lock();
1569 spin_lock(&mrt_lock);
1570 if (rtnl_dereference(mrt->mroute_sk)) {
1571 err = -EADDRINUSE;
1572 } else {
1573 rcu_assign_pointer(mrt->mroute_sk, sk);
1574 sock_set_flag(sk, SOCK_RCU_FREE);
1575 atomic_inc(&net->ipv6.devconf_all->mc_forwarding);
1576 }
1577 spin_unlock(&mrt_lock);
1578
1579 if (!err)
1580 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
1581 NETCONFA_MC_FORWARDING,
1582 NETCONFA_IFINDEX_ALL,
1583 net->ipv6.devconf_all);
1584 rtnl_unlock();
1585
1586 return err;
1587 }
1588
1589 int ip6mr_sk_done(struct sock *sk)
1590 {
1591 struct net *net = sock_net(sk);
1592 struct ipv6_devconf *devconf;
1593 struct mr_table *mrt;
1594 int err = -EACCES;
1595
1596 if (sk->sk_type != SOCK_RAW ||
1597 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1598 return err;
1599
1600 devconf = net->ipv6.devconf_all;
1601 if (!devconf || !atomic_read(&devconf->mc_forwarding))
1602 return err;
1603
1604 rtnl_lock();
1605 ip6mr_for_each_table(mrt, net) {
1606 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1607 spin_lock(&mrt_lock);
1608 RCU_INIT_POINTER(mrt->mroute_sk, NULL);
1609 /* Note that mroute_sk had SOCK_RCU_FREE set,
1610 * so the RCU grace period before sk freeing
1611 * is guaranteed by sk_destruct()
1612 */
1613 atomic_dec(&devconf->mc_forwarding);
1614 spin_unlock(&mrt_lock);
1615 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
1616 NETCONFA_MC_FORWARDING,
1617 NETCONFA_IFINDEX_ALL,
1618 net->ipv6.devconf_all);
1619
1620 mroute_clean_tables(mrt, MRT6_FLUSH_MIFS | MRT6_FLUSH_MFC);
1621 err = 0;
1622 break;
1623 }
1624 }
1625 rtnl_unlock();
1626
1627 return err;
1628 }
1629
1630 bool mroute6_is_socket(struct net *net, struct sk_buff *skb)
1631 {
1632 struct mr_table *mrt;
1633 struct flowi6 fl6 = {
1634 .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
1635 .flowi6_oif = skb->dev->ifindex,
1636 .flowi6_mark = skb->mark,
1637 };
1638
1639 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
1640 return NULL;
1641
1642 return rcu_access_pointer(mrt->mroute_sk);
1643 }
1644 EXPORT_SYMBOL(mroute6_is_socket);
1645
1646 /*
1647 * Socket options and virtual interface manipulation. The whole
1648 * virtual interface system is a complete heap, but unfortunately
1649 * that's how BSD mrouted happens to think. Maybe one day with a proper
1650 * MOSPF/PIM router set up we can clean this up.
1651 */
1652
1653 int ip6_mroute_setsockopt(struct sock *sk, int optname, sockptr_t optval,
1654 unsigned int optlen)
1655 {
1656 int ret, parent = 0;
1657 struct mif6ctl vif;
1658 struct mf6cctl mfc;
1659 mifi_t mifi;
1660 struct net *net = sock_net(sk);
1661 struct mr_table *mrt;
1662
1663 if (sk->sk_type != SOCK_RAW ||
1664 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1665 return -EOPNOTSUPP;
1666
1667 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1668 if (!mrt)
1669 return -ENOENT;
1670
1671 if (optname != MRT6_INIT) {
1672 if (sk != rcu_access_pointer(mrt->mroute_sk) &&
1673 !ns_capable(net->user_ns, CAP_NET_ADMIN))
1674 return -EACCES;
1675 }
1676
1677 switch (optname) {
1678 case MRT6_INIT:
1679 if (optlen < sizeof(int))
1680 return -EINVAL;
1681
1682 return ip6mr_sk_init(mrt, sk);
1683
1684 case MRT6_DONE:
1685 return ip6mr_sk_done(sk);
1686
1687 case MRT6_ADD_MIF:
1688 if (optlen < sizeof(vif))
1689 return -EINVAL;
1690 if (copy_from_sockptr(&vif, optval, sizeof(vif)))
1691 return -EFAULT;
1692 if (vif.mif6c_mifi >= MAXMIFS)
1693 return -ENFILE;
1694 rtnl_lock();
1695 ret = mif6_add(net, mrt, &vif,
1696 sk == rtnl_dereference(mrt->mroute_sk));
1697 rtnl_unlock();
1698 return ret;
1699
1700 case MRT6_DEL_MIF:
1701 if (optlen < sizeof(mifi_t))
1702 return -EINVAL;
1703 if (copy_from_sockptr(&mifi, optval, sizeof(mifi_t)))
1704 return -EFAULT;
1705 rtnl_lock();
1706 ret = mif6_delete(mrt, mifi, 0, NULL);
1707 rtnl_unlock();
1708 return ret;
1709
1710 /*
1711 * Manipulate the forwarding caches. These live
1712 * in a sort of kernel/user symbiosis.
1713 */
1714 case MRT6_ADD_MFC:
1715 case MRT6_DEL_MFC:
1716 parent = -1;
1717 fallthrough;
1718 case MRT6_ADD_MFC_PROXY:
1719 case MRT6_DEL_MFC_PROXY:
1720 if (optlen < sizeof(mfc))
1721 return -EINVAL;
1722 if (copy_from_sockptr(&mfc, optval, sizeof(mfc)))
1723 return -EFAULT;
1724 if (parent == 0)
1725 parent = mfc.mf6cc_parent;
1726 rtnl_lock();
1727 if (optname == MRT6_DEL_MFC || optname == MRT6_DEL_MFC_PROXY)
1728 ret = ip6mr_mfc_delete(mrt, &mfc, parent);
1729 else
1730 ret = ip6mr_mfc_add(net, mrt, &mfc,
1731 sk ==
1732 rtnl_dereference(mrt->mroute_sk),
1733 parent);
1734 rtnl_unlock();
1735 return ret;
1736
1737 case MRT6_FLUSH:
1738 {
1739 int flags;
1740
1741 if (optlen != sizeof(flags))
1742 return -EINVAL;
1743 if (copy_from_sockptr(&flags, optval, sizeof(flags)))
1744 return -EFAULT;
1745 rtnl_lock();
1746 mroute_clean_tables(mrt, flags);
1747 rtnl_unlock();
1748 return 0;
1749 }
1750
1751 /*
1752 * Control PIM assert (to activate pim will activate assert)
1753 */
1754 case MRT6_ASSERT:
1755 {
1756 int v;
1757
1758 if (optlen != sizeof(v))
1759 return -EINVAL;
1760 if (copy_from_sockptr(&v, optval, sizeof(v)))
1761 return -EFAULT;
1762 mrt->mroute_do_assert = v;
1763 return 0;
1764 }
1765
1766 #ifdef CONFIG_IPV6_PIMSM_V2
1767 case MRT6_PIM:
1768 {
1769 bool do_wrmifwhole;
1770 int v;
1771
1772 if (optlen != sizeof(v))
1773 return -EINVAL;
1774 if (copy_from_sockptr(&v, optval, sizeof(v)))
1775 return -EFAULT;
1776
1777 do_wrmifwhole = (v == MRT6MSG_WRMIFWHOLE);
1778 v = !!v;
1779 rtnl_lock();
1780 ret = 0;
1781 if (v != mrt->mroute_do_pim) {
1782 mrt->mroute_do_pim = v;
1783 mrt->mroute_do_assert = v;
1784 mrt->mroute_do_wrvifwhole = do_wrmifwhole;
1785 }
1786 rtnl_unlock();
1787 return ret;
1788 }
1789
1790 #endif
1791 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
1792 case MRT6_TABLE:
1793 {
1794 u32 v;
1795
1796 if (optlen != sizeof(u32))
1797 return -EINVAL;
1798 if (copy_from_sockptr(&v, optval, sizeof(v)))
1799 return -EFAULT;
1800 /* "pim6reg%u" should not exceed 16 bytes (IFNAMSIZ) */
1801 if (v != RT_TABLE_DEFAULT && v >= 100000000)
1802 return -EINVAL;
1803 if (sk == rcu_access_pointer(mrt->mroute_sk))
1804 return -EBUSY;
1805
1806 rtnl_lock();
1807 ret = 0;
1808 mrt = ip6mr_new_table(net, v);
1809 if (IS_ERR(mrt))
1810 ret = PTR_ERR(mrt);
1811 else
1812 raw6_sk(sk)->ip6mr_table = v;
1813 rtnl_unlock();
1814 return ret;
1815 }
1816 #endif
1817 /*
1818 * Spurious command, or MRT6_VERSION which you cannot
1819 * set.
1820 */
1821 default:
1822 return -ENOPROTOOPT;
1823 }
1824 }
1825
1826 /*
1827 * Getsock opt support for the multicast routing system.
1828 */
1829
1830 int ip6_mroute_getsockopt(struct sock *sk, int optname, sockptr_t optval,
1831 sockptr_t optlen)
1832 {
1833 int olr;
1834 int val;
1835 struct net *net = sock_net(sk);
1836 struct mr_table *mrt;
1837
1838 if (sk->sk_type != SOCK_RAW ||
1839 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1840 return -EOPNOTSUPP;
1841
1842 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1843 if (!mrt)
1844 return -ENOENT;
1845
1846 switch (optname) {
1847 case MRT6_VERSION:
1848 val = 0x0305;
1849 break;
1850 #ifdef CONFIG_IPV6_PIMSM_V2
1851 case MRT6_PIM:
1852 val = mrt->mroute_do_pim;
1853 break;
1854 #endif
1855 case MRT6_ASSERT:
1856 val = mrt->mroute_do_assert;
1857 break;
1858 default:
1859 return -ENOPROTOOPT;
1860 }
1861
1862 if (copy_from_sockptr(&olr, optlen, sizeof(int)))
1863 return -EFAULT;
1864
1865 olr = min_t(int, olr, sizeof(int));
1866 if (olr < 0)
1867 return -EINVAL;
1868
1869 if (copy_to_sockptr(optlen, &olr, sizeof(int)))
1870 return -EFAULT;
1871 if (copy_to_sockptr(optval, &val, olr))
1872 return -EFAULT;
1873 return 0;
1874 }
1875
1876 /*
1877 * The IP multicast ioctl support routines.
1878 */
1879 int ip6mr_ioctl(struct sock *sk, int cmd, void *arg)
1880 {
1881 struct sioc_sg_req6 *sr;
1882 struct sioc_mif_req6 *vr;
1883 struct vif_device *vif;
1884 struct mfc6_cache *c;
1885 struct net *net = sock_net(sk);
1886 struct mr_table *mrt;
1887
1888 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1889 if (!mrt)
1890 return -ENOENT;
1891
1892 switch (cmd) {
1893 case SIOCGETMIFCNT_IN6:
1894 vr = (struct sioc_mif_req6 *)arg;
1895 if (vr->mifi >= mrt->maxvif)
1896 return -EINVAL;
1897 vr->mifi = array_index_nospec(vr->mifi, mrt->maxvif);
1898 rcu_read_lock();
1899 vif = &mrt->vif_table[vr->mifi];
1900 if (VIF_EXISTS(mrt, vr->mifi)) {
1901 vr->icount = READ_ONCE(vif->pkt_in);
1902 vr->ocount = READ_ONCE(vif->pkt_out);
1903 vr->ibytes = READ_ONCE(vif->bytes_in);
1904 vr->obytes = READ_ONCE(vif->bytes_out);
1905 rcu_read_unlock();
1906 return 0;
1907 }
1908 rcu_read_unlock();
1909 return -EADDRNOTAVAIL;
1910 case SIOCGETSGCNT_IN6:
1911 sr = (struct sioc_sg_req6 *)arg;
1912
1913 rcu_read_lock();
1914 c = ip6mr_cache_find(mrt, &sr->src.sin6_addr,
1915 &sr->grp.sin6_addr);
1916 if (c) {
1917 sr->pktcnt = c->_c.mfc_un.res.pkt;
1918 sr->bytecnt = c->_c.mfc_un.res.bytes;
1919 sr->wrong_if = c->_c.mfc_un.res.wrong_if;
1920 rcu_read_unlock();
1921 return 0;
1922 }
1923 rcu_read_unlock();
1924 return -EADDRNOTAVAIL;
1925 default:
1926 return -ENOIOCTLCMD;
1927 }
1928 }
1929
1930 #ifdef CONFIG_COMPAT
1931 struct compat_sioc_sg_req6 {
1932 struct sockaddr_in6 src;
1933 struct sockaddr_in6 grp;
1934 compat_ulong_t pktcnt;
1935 compat_ulong_t bytecnt;
1936 compat_ulong_t wrong_if;
1937 };
1938
1939 struct compat_sioc_mif_req6 {
1940 mifi_t mifi;
1941 compat_ulong_t icount;
1942 compat_ulong_t ocount;
1943 compat_ulong_t ibytes;
1944 compat_ulong_t obytes;
1945 };
1946
1947 int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1948 {
1949 struct compat_sioc_sg_req6 sr;
1950 struct compat_sioc_mif_req6 vr;
1951 struct vif_device *vif;
1952 struct mfc6_cache *c;
1953 struct net *net = sock_net(sk);
1954 struct mr_table *mrt;
1955
1956 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1957 if (!mrt)
1958 return -ENOENT;
1959
1960 switch (cmd) {
1961 case SIOCGETMIFCNT_IN6:
1962 if (copy_from_user(&vr, arg, sizeof(vr)))
1963 return -EFAULT;
1964 if (vr.mifi >= mrt->maxvif)
1965 return -EINVAL;
1966 vr.mifi = array_index_nospec(vr.mifi, mrt->maxvif);
1967 rcu_read_lock();
1968 vif = &mrt->vif_table[vr.mifi];
1969 if (VIF_EXISTS(mrt, vr.mifi)) {
1970 vr.icount = READ_ONCE(vif->pkt_in);
1971 vr.ocount = READ_ONCE(vif->pkt_out);
1972 vr.ibytes = READ_ONCE(vif->bytes_in);
1973 vr.obytes = READ_ONCE(vif->bytes_out);
1974 rcu_read_unlock();
1975
1976 if (copy_to_user(arg, &vr, sizeof(vr)))
1977 return -EFAULT;
1978 return 0;
1979 }
1980 rcu_read_unlock();
1981 return -EADDRNOTAVAIL;
1982 case SIOCGETSGCNT_IN6:
1983 if (copy_from_user(&sr, arg, sizeof(sr)))
1984 return -EFAULT;
1985
1986 rcu_read_lock();
1987 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1988 if (c) {
1989 sr.pktcnt = c->_c.mfc_un.res.pkt;
1990 sr.bytecnt = c->_c.mfc_un.res.bytes;
1991 sr.wrong_if = c->_c.mfc_un.res.wrong_if;
1992 rcu_read_unlock();
1993
1994 if (copy_to_user(arg, &sr, sizeof(sr)))
1995 return -EFAULT;
1996 return 0;
1997 }
1998 rcu_read_unlock();
1999 return -EADDRNOTAVAIL;
2000 default:
2001 return -ENOIOCTLCMD;
2002 }
2003 }
2004 #endif
2005
2006 static inline int ip6mr_forward2_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
2007 {
2008 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
2009 IPSTATS_MIB_OUTFORWDATAGRAMS);
2010 return dst_output(net, sk, skb);
2011 }
2012
2013 /*
2014 * Processing handlers for ip6mr_forward
2015 */
2016
2017 static int ip6mr_forward2(struct net *net, struct mr_table *mrt,
2018 struct sk_buff *skb, int vifi)
2019 {
2020 struct vif_device *vif = &mrt->vif_table[vifi];
2021 struct net_device *vif_dev;
2022 struct ipv6hdr *ipv6h;
2023 struct dst_entry *dst;
2024 struct flowi6 fl6;
2025
2026 vif_dev = vif_dev_read(vif);
2027 if (!vif_dev)
2028 goto out_free;
2029
2030 #ifdef CONFIG_IPV6_PIMSM_V2
2031 if (vif->flags & MIFF_REGISTER) {
2032 WRITE_ONCE(vif->pkt_out, vif->pkt_out + 1);
2033 WRITE_ONCE(vif->bytes_out, vif->bytes_out + skb->len);
2034 DEV_STATS_ADD(vif_dev, tx_bytes, skb->len);
2035 DEV_STATS_INC(vif_dev, tx_packets);
2036 ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT);
2037 goto out_free;
2038 }
2039 #endif
2040
2041 ipv6h = ipv6_hdr(skb);
2042
2043 fl6 = (struct flowi6) {
2044 .flowi6_oif = vif->link,
2045 .daddr = ipv6h->daddr,
2046 };
2047
2048 dst = ip6_route_output(net, NULL, &fl6);
2049 if (dst->error) {
2050 dst_release(dst);
2051 goto out_free;
2052 }
2053
2054 skb_dst_drop(skb);
2055 skb_dst_set(skb, dst);
2056
2057 /*
2058 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
2059 * not only before forwarding, but after forwarding on all output
2060 * interfaces. It is clear, if mrouter runs a multicasting
2061 * program, it should receive packets not depending to what interface
2062 * program is joined.
2063 * If we will not make it, the program will have to join on all
2064 * interfaces. On the other hand, multihoming host (or router, but
2065 * not mrouter) cannot join to more than one interface - it will
2066 * result in receiving multiple packets.
2067 */
2068 skb->dev = vif_dev;
2069 WRITE_ONCE(vif->pkt_out, vif->pkt_out + 1);
2070 WRITE_ONCE(vif->bytes_out, vif->bytes_out + skb->len);
2071
2072 /* We are about to write */
2073 /* XXX: extension headers? */
2074 if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(vif_dev)))
2075 goto out_free;
2076
2077 ipv6h = ipv6_hdr(skb);
2078 ipv6h->hop_limit--;
2079
2080 IP6CB(skb)->flags |= IP6SKB_FORWARDED;
2081
2082 return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD,
2083 net, NULL, skb, skb->dev, vif_dev,
2084 ip6mr_forward2_finish);
2085
2086 out_free:
2087 kfree_skb(skb);
2088 return 0;
2089 }
2090
2091 /* Called with rcu_read_lock() */
2092 static int ip6mr_find_vif(struct mr_table *mrt, struct net_device *dev)
2093 {
2094 int ct;
2095
2096 /* Pairs with WRITE_ONCE() in mif6_delete()/mif6_add() */
2097 for (ct = READ_ONCE(mrt->maxvif) - 1; ct >= 0; ct--) {
2098 if (rcu_access_pointer(mrt->vif_table[ct].dev) == dev)
2099 break;
2100 }
2101 return ct;
2102 }
2103
2104 /* Called under rcu_read_lock() */
2105 static void ip6_mr_forward(struct net *net, struct mr_table *mrt,
2106 struct net_device *dev, struct sk_buff *skb,
2107 struct mfc6_cache *c)
2108 {
2109 int psend = -1;
2110 int vif, ct;
2111 int true_vifi = ip6mr_find_vif(mrt, dev);
2112
2113 vif = c->_c.mfc_parent;
2114 c->_c.mfc_un.res.pkt++;
2115 c->_c.mfc_un.res.bytes += skb->len;
2116 c->_c.mfc_un.res.lastuse = jiffies;
2117
2118 if (ipv6_addr_any(&c->mf6c_origin) && true_vifi >= 0) {
2119 struct mfc6_cache *cache_proxy;
2120
2121 /* For an (*,G) entry, we only check that the incoming
2122 * interface is part of the static tree.
2123 */
2124 cache_proxy = mr_mfc_find_any_parent(mrt, vif);
2125 if (cache_proxy &&
2126 cache_proxy->_c.mfc_un.res.ttls[true_vifi] < 255)
2127 goto forward;
2128 }
2129
2130 /*
2131 * Wrong interface: drop packet and (maybe) send PIM assert.
2132 */
2133 if (rcu_access_pointer(mrt->vif_table[vif].dev) != dev) {
2134 c->_c.mfc_un.res.wrong_if++;
2135
2136 if (true_vifi >= 0 && mrt->mroute_do_assert &&
2137 /* pimsm uses asserts, when switching from RPT to SPT,
2138 so that we cannot check that packet arrived on an oif.
2139 It is bad, but otherwise we would need to move pretty
2140 large chunk of pimd to kernel. Ough... --ANK
2141 */
2142 (mrt->mroute_do_pim ||
2143 c->_c.mfc_un.res.ttls[true_vifi] < 255) &&
2144 time_after(jiffies,
2145 c->_c.mfc_un.res.last_assert +
2146 MFC_ASSERT_THRESH)) {
2147 c->_c.mfc_un.res.last_assert = jiffies;
2148 ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF);
2149 if (mrt->mroute_do_wrvifwhole)
2150 ip6mr_cache_report(mrt, skb, true_vifi,
2151 MRT6MSG_WRMIFWHOLE);
2152 }
2153 goto dont_forward;
2154 }
2155
2156 forward:
2157 WRITE_ONCE(mrt->vif_table[vif].pkt_in,
2158 mrt->vif_table[vif].pkt_in + 1);
2159 WRITE_ONCE(mrt->vif_table[vif].bytes_in,
2160 mrt->vif_table[vif].bytes_in + skb->len);
2161
2162 /*
2163 * Forward the frame
2164 */
2165 if (ipv6_addr_any(&c->mf6c_origin) &&
2166 ipv6_addr_any(&c->mf6c_mcastgrp)) {
2167 if (true_vifi >= 0 &&
2168 true_vifi != c->_c.mfc_parent &&
2169 ipv6_hdr(skb)->hop_limit >
2170 c->_c.mfc_un.res.ttls[c->_c.mfc_parent]) {
2171 /* It's an (*,*) entry and the packet is not coming from
2172 * the upstream: forward the packet to the upstream
2173 * only.
2174 */
2175 psend = c->_c.mfc_parent;
2176 goto last_forward;
2177 }
2178 goto dont_forward;
2179 }
2180 for (ct = c->_c.mfc_un.res.maxvif - 1;
2181 ct >= c->_c.mfc_un.res.minvif; ct--) {
2182 /* For (*,G) entry, don't forward to the incoming interface */
2183 if ((!ipv6_addr_any(&c->mf6c_origin) || ct != true_vifi) &&
2184 ipv6_hdr(skb)->hop_limit > c->_c.mfc_un.res.ttls[ct]) {
2185 if (psend != -1) {
2186 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2187 if (skb2)
2188 ip6mr_forward2(net, mrt, skb2, psend);
2189 }
2190 psend = ct;
2191 }
2192 }
2193 last_forward:
2194 if (psend != -1) {
2195 ip6mr_forward2(net, mrt, skb, psend);
2196 return;
2197 }
2198
2199 dont_forward:
2200 kfree_skb(skb);
2201 }
2202
2203
2204 /*
2205 * Multicast packets for forwarding arrive here
2206 */
2207
2208 int ip6_mr_input(struct sk_buff *skb)
2209 {
2210 struct mfc6_cache *cache;
2211 struct net *net = dev_net(skb->dev);
2212 struct mr_table *mrt;
2213 struct flowi6 fl6 = {
2214 .flowi6_iif = skb->dev->ifindex,
2215 .flowi6_mark = skb->mark,
2216 };
2217 int err;
2218 struct net_device *dev;
2219
2220 /* skb->dev passed in is the master dev for vrfs.
2221 * Get the proper interface that does have a vif associated with it.
2222 */
2223 dev = skb->dev;
2224 if (netif_is_l3_master(skb->dev)) {
2225 dev = dev_get_by_index_rcu(net, IPCB(skb)->iif);
2226 if (!dev) {
2227 kfree_skb(skb);
2228 return -ENODEV;
2229 }
2230 }
2231
2232 err = ip6mr_fib_lookup(net, &fl6, &mrt);
2233 if (err < 0) {
2234 kfree_skb(skb);
2235 return err;
2236 }
2237
2238 cache = ip6mr_cache_find(mrt,
2239 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr);
2240 if (!cache) {
2241 int vif = ip6mr_find_vif(mrt, dev);
2242
2243 if (vif >= 0)
2244 cache = ip6mr_cache_find_any(mrt,
2245 &ipv6_hdr(skb)->daddr,
2246 vif);
2247 }
2248
2249 /*
2250 * No usable cache entry
2251 */
2252 if (!cache) {
2253 int vif;
2254
2255 vif = ip6mr_find_vif(mrt, dev);
2256 if (vif >= 0) {
2257 int err = ip6mr_cache_unresolved(mrt, vif, skb, dev);
2258
2259 return err;
2260 }
2261 kfree_skb(skb);
2262 return -ENODEV;
2263 }
2264
2265 ip6_mr_forward(net, mrt, dev, skb, cache);
2266
2267 return 0;
2268 }
2269
2270 int ip6mr_get_route(struct net *net, struct sk_buff *skb, struct rtmsg *rtm,
2271 u32 portid)
2272 {
2273 int err;
2274 struct mr_table *mrt;
2275 struct mfc6_cache *cache;
2276 struct rt6_info *rt = dst_rt6_info(skb_dst(skb));
2277
2278 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
2279 if (!mrt)
2280 return -ENOENT;
2281
2282 rcu_read_lock();
2283 cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr);
2284 if (!cache && skb->dev) {
2285 int vif = ip6mr_find_vif(mrt, skb->dev);
2286
2287 if (vif >= 0)
2288 cache = ip6mr_cache_find_any(mrt, &rt->rt6i_dst.addr,
2289 vif);
2290 }
2291
2292 if (!cache) {
2293 struct sk_buff *skb2;
2294 struct ipv6hdr *iph;
2295 struct net_device *dev;
2296 int vif;
2297
2298 dev = skb->dev;
2299 if (!dev || (vif = ip6mr_find_vif(mrt, dev)) < 0) {
2300 rcu_read_unlock();
2301 return -ENODEV;
2302 }
2303
2304 /* really correct? */
2305 skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
2306 if (!skb2) {
2307 rcu_read_unlock();
2308 return -ENOMEM;
2309 }
2310
2311 NETLINK_CB(skb2).portid = portid;
2312 skb_reset_transport_header(skb2);
2313
2314 skb_put(skb2, sizeof(struct ipv6hdr));
2315 skb_reset_network_header(skb2);
2316
2317 iph = ipv6_hdr(skb2);
2318 iph->version = 0;
2319 iph->priority = 0;
2320 iph->flow_lbl[0] = 0;
2321 iph->flow_lbl[1] = 0;
2322 iph->flow_lbl[2] = 0;
2323 iph->payload_len = 0;
2324 iph->nexthdr = IPPROTO_NONE;
2325 iph->hop_limit = 0;
2326 iph->saddr = rt->rt6i_src.addr;
2327 iph->daddr = rt->rt6i_dst.addr;
2328
2329 err = ip6mr_cache_unresolved(mrt, vif, skb2, dev);
2330 rcu_read_unlock();
2331
2332 return err;
2333 }
2334
2335 err = mr_fill_mroute(mrt, skb, &cache->_c, rtm);
2336 rcu_read_unlock();
2337 return err;
2338 }
2339
2340 static int ip6mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2341 u32 portid, u32 seq, struct mfc6_cache *c, int cmd,
2342 int flags)
2343 {
2344 struct nlmsghdr *nlh;
2345 struct rtmsg *rtm;
2346 int err;
2347
2348 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
2349 if (!nlh)
2350 return -EMSGSIZE;
2351
2352 rtm = nlmsg_data(nlh);
2353 rtm->rtm_family = RTNL_FAMILY_IP6MR;
2354 rtm->rtm_dst_len = 128;
2355 rtm->rtm_src_len = 128;
2356 rtm->rtm_tos = 0;
2357 rtm->rtm_table = mrt->id;
2358 if (nla_put_u32(skb, RTA_TABLE, mrt->id))
2359 goto nla_put_failure;
2360 rtm->rtm_type = RTN_MULTICAST;
2361 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2362 if (c->_c.mfc_flags & MFC_STATIC)
2363 rtm->rtm_protocol = RTPROT_STATIC;
2364 else
2365 rtm->rtm_protocol = RTPROT_MROUTED;
2366 rtm->rtm_flags = 0;
2367
2368 if (nla_put_in6_addr(skb, RTA_SRC, &c->mf6c_origin) ||
2369 nla_put_in6_addr(skb, RTA_DST, &c->mf6c_mcastgrp))
2370 goto nla_put_failure;
2371 err = mr_fill_mroute(mrt, skb, &c->_c, rtm);
2372 /* do not break the dump if cache is unresolved */
2373 if (err < 0 && err != -ENOENT)
2374 goto nla_put_failure;
2375
2376 nlmsg_end(skb, nlh);
2377 return 0;
2378
2379 nla_put_failure:
2380 nlmsg_cancel(skb, nlh);
2381 return -EMSGSIZE;
2382 }
2383
2384 static int _ip6mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2385 u32 portid, u32 seq, struct mr_mfc *c,
2386 int cmd, int flags)
2387 {
2388 return ip6mr_fill_mroute(mrt, skb, portid, seq, (struct mfc6_cache *)c,
2389 cmd, flags);
2390 }
2391
2392 static int mr6_msgsize(bool unresolved, int maxvif)
2393 {
2394 size_t len =
2395 NLMSG_ALIGN(sizeof(struct rtmsg))
2396 + nla_total_size(4) /* RTA_TABLE */
2397 + nla_total_size(sizeof(struct in6_addr)) /* RTA_SRC */
2398 + nla_total_size(sizeof(struct in6_addr)) /* RTA_DST */
2399 ;
2400
2401 if (!unresolved)
2402 len = len
2403 + nla_total_size(4) /* RTA_IIF */
2404 + nla_total_size(0) /* RTA_MULTIPATH */
2405 + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
2406 /* RTA_MFC_STATS */
2407 + nla_total_size_64bit(sizeof(struct rta_mfc_stats))
2408 ;
2409
2410 return len;
2411 }
2412
2413 static void mr6_netlink_event(struct mr_table *mrt, struct mfc6_cache *mfc,
2414 int cmd)
2415 {
2416 struct net *net = read_pnet(&mrt->net);
2417 struct sk_buff *skb;
2418 int err = -ENOBUFS;
2419
2420 skb = nlmsg_new(mr6_msgsize(mfc->_c.mfc_parent >= MAXMIFS, mrt->maxvif),
2421 GFP_ATOMIC);
2422 if (!skb)
2423 goto errout;
2424
2425 err = ip6mr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
2426 if (err < 0)
2427 goto errout;
2428
2429 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE, NULL, GFP_ATOMIC);
2430 return;
2431
2432 errout:
2433 kfree_skb(skb);
2434 if (err < 0)
2435 rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE, err);
2436 }
2437
2438 static size_t mrt6msg_netlink_msgsize(size_t payloadlen)
2439 {
2440 size_t len =
2441 NLMSG_ALIGN(sizeof(struct rtgenmsg))
2442 + nla_total_size(1) /* IP6MRA_CREPORT_MSGTYPE */
2443 + nla_total_size(4) /* IP6MRA_CREPORT_MIF_ID */
2444 /* IP6MRA_CREPORT_SRC_ADDR */
2445 + nla_total_size(sizeof(struct in6_addr))
2446 /* IP6MRA_CREPORT_DST_ADDR */
2447 + nla_total_size(sizeof(struct in6_addr))
2448 /* IP6MRA_CREPORT_PKT */
2449 + nla_total_size(payloadlen)
2450 ;
2451
2452 return len;
2453 }
2454
2455 static void mrt6msg_netlink_event(const struct mr_table *mrt, struct sk_buff *pkt)
2456 {
2457 struct net *net = read_pnet(&mrt->net);
2458 struct nlmsghdr *nlh;
2459 struct rtgenmsg *rtgenm;
2460 struct mrt6msg *msg;
2461 struct sk_buff *skb;
2462 struct nlattr *nla;
2463 int payloadlen;
2464
2465 payloadlen = pkt->len - sizeof(struct mrt6msg);
2466 msg = (struct mrt6msg *)skb_transport_header(pkt);
2467
2468 skb = nlmsg_new(mrt6msg_netlink_msgsize(payloadlen), GFP_ATOMIC);
2469 if (!skb)
2470 goto errout;
2471
2472 nlh = nlmsg_put(skb, 0, 0, RTM_NEWCACHEREPORT,
2473 sizeof(struct rtgenmsg), 0);
2474 if (!nlh)
2475 goto errout;
2476 rtgenm = nlmsg_data(nlh);
2477 rtgenm->rtgen_family = RTNL_FAMILY_IP6MR;
2478 if (nla_put_u8(skb, IP6MRA_CREPORT_MSGTYPE, msg->im6_msgtype) ||
2479 nla_put_u32(skb, IP6MRA_CREPORT_MIF_ID, msg->im6_mif) ||
2480 nla_put_in6_addr(skb, IP6MRA_CREPORT_SRC_ADDR,
2481 &msg->im6_src) ||
2482 nla_put_in6_addr(skb, IP6MRA_CREPORT_DST_ADDR,
2483 &msg->im6_dst))
2484 goto nla_put_failure;
2485
2486 nla = nla_reserve(skb, IP6MRA_CREPORT_PKT, payloadlen);
2487 if (!nla || skb_copy_bits(pkt, sizeof(struct mrt6msg),
2488 nla_data(nla), payloadlen))
2489 goto nla_put_failure;
2490
2491 nlmsg_end(skb, nlh);
2492
2493 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE_R, NULL, GFP_ATOMIC);
2494 return;
2495
2496 nla_put_failure:
2497 nlmsg_cancel(skb, nlh);
2498 errout:
2499 kfree_skb(skb);
2500 rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE_R, -ENOBUFS);
2501 }
2502
2503 static const struct nla_policy ip6mr_getroute_policy[RTA_MAX + 1] = {
2504 [RTA_SRC] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
2505 [RTA_DST] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
2506 [RTA_TABLE] = { .type = NLA_U32 },
2507 };
2508
2509 static int ip6mr_rtm_valid_getroute_req(struct sk_buff *skb,
2510 const struct nlmsghdr *nlh,
2511 struct nlattr **tb,
2512 struct netlink_ext_ack *extack)
2513 {
2514 struct rtmsg *rtm;
2515 int err;
2516
2517 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, ip6mr_getroute_policy,
2518 extack);
2519 if (err)
2520 return err;
2521
2522 rtm = nlmsg_data(nlh);
2523 if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) ||
2524 (rtm->rtm_dst_len && rtm->rtm_dst_len != 128) ||
2525 rtm->rtm_tos || rtm->rtm_table || rtm->rtm_protocol ||
2526 rtm->rtm_scope || rtm->rtm_type || rtm->rtm_flags) {
2527 NL_SET_ERR_MSG_MOD(extack,
2528 "Invalid values in header for multicast route get request");
2529 return -EINVAL;
2530 }
2531
2532 if ((tb[RTA_SRC] && !rtm->rtm_src_len) ||
2533 (tb[RTA_DST] && !rtm->rtm_dst_len)) {
2534 NL_SET_ERR_MSG_MOD(extack, "rtm_src_len and rtm_dst_len must be 128 for IPv6");
2535 return -EINVAL;
2536 }
2537
2538 return 0;
2539 }
2540
2541 static int ip6mr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
2542 struct netlink_ext_ack *extack)
2543 {
2544 struct net *net = sock_net(in_skb->sk);
2545 struct in6_addr src = {}, grp = {};
2546 struct nlattr *tb[RTA_MAX + 1];
2547 struct mfc6_cache *cache;
2548 struct mr_table *mrt;
2549 struct sk_buff *skb;
2550 u32 tableid;
2551 int err;
2552
2553 err = ip6mr_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
2554 if (err < 0)
2555 return err;
2556
2557 if (tb[RTA_SRC])
2558 src = nla_get_in6_addr(tb[RTA_SRC]);
2559 if (tb[RTA_DST])
2560 grp = nla_get_in6_addr(tb[RTA_DST]);
2561 tableid = tb[RTA_TABLE] ? nla_get_u32(tb[RTA_TABLE]) : 0;
2562
2563 mrt = ip6mr_get_table(net, tableid ?: RT_TABLE_DEFAULT);
2564 if (!mrt) {
2565 NL_SET_ERR_MSG_MOD(extack, "MR table does not exist");
2566 return -ENOENT;
2567 }
2568
2569 /* entries are added/deleted only under RTNL */
2570 rcu_read_lock();
2571 cache = ip6mr_cache_find(mrt, &src, &grp);
2572 rcu_read_unlock();
2573 if (!cache) {
2574 NL_SET_ERR_MSG_MOD(extack, "MR cache entry not found");
2575 return -ENOENT;
2576 }
2577
2578 skb = nlmsg_new(mr6_msgsize(false, mrt->maxvif), GFP_KERNEL);
2579 if (!skb)
2580 return -ENOBUFS;
2581
2582 err = ip6mr_fill_mroute(mrt, skb, NETLINK_CB(in_skb).portid,
2583 nlh->nlmsg_seq, cache, RTM_NEWROUTE, 0);
2584 if (err < 0) {
2585 kfree_skb(skb);
2586 return err;
2587 }
2588
2589 return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2590 }
2591
2592 static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2593 {
2594 const struct nlmsghdr *nlh = cb->nlh;
2595 struct fib_dump_filter filter = {
2596 .rtnl_held = true,
2597 };
2598 int err;
2599
2600 if (cb->strict_check) {
2601 err = ip_valid_fib_dump_req(sock_net(skb->sk), nlh,
2602 &filter, cb);
2603 if (err < 0)
2604 return err;
2605 }
2606
2607 if (filter.table_id) {
2608 struct mr_table *mrt;
2609
2610 mrt = ip6mr_get_table(sock_net(skb->sk), filter.table_id);
2611 if (!mrt) {
2612 if (rtnl_msg_family(cb->nlh) != RTNL_FAMILY_IP6MR)
2613 return skb->len;
2614
2615 NL_SET_ERR_MSG_MOD(cb->extack, "MR table does not exist");
2616 return -ENOENT;
2617 }
2618 err = mr_table_dump(mrt, skb, cb, _ip6mr_fill_mroute,
2619 &mfc_unres_lock, &filter);
2620 return skb->len ? : err;
2621 }
2622
2623 return mr_rtm_dumproute(skb, cb, ip6mr_mr_table_iter,
2624 _ip6mr_fill_mroute, &mfc_unres_lock, &filter);
2625 }
2626
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