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1/*
2 * IP multicast routing support for mrouted 3.6/3.8
3 *
4 * (c) 1995 Alan Cox, <alan@lxorguk.ukuu.org.uk>
5 * Linux Consultancy and Custom Driver Development
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 *
12 * Fixes:
13 * Michael Chastain : Incorrect size of copying.
14 * Alan Cox : Added the cache manager code
15 * Alan Cox : Fixed the clone/copy bug and device race.
16 * Mike McLagan : Routing by source
17 * Malcolm Beattie : Buffer handling fixes.
18 * Alexey Kuznetsov : Double buffer free and other fixes.
19 * SVR Anand : Fixed several multicast bugs and problems.
20 * Alexey Kuznetsov : Status, optimisations and more.
21 * Brad Parker : Better behaviour on mrouted upcall
22 * overflow.
23 * Carlos Picoto : PIMv1 Support
24 * Pavlin Ivanov Radoslavov: PIMv2 Registers must checksum only PIM header
25 * Relax this requirement to work with older peers.
26 *
27 */
28
29#include <asm/uaccess.h>
30#include <linux/types.h>
31#include <linux/capability.h>
32#include <linux/errno.h>
33#include <linux/timer.h>
34#include <linux/mm.h>
35#include <linux/kernel.h>
36#include <linux/fcntl.h>
37#include <linux/stat.h>
38#include <linux/socket.h>
39#include <linux/in.h>
40#include <linux/inet.h>
41#include <linux/netdevice.h>
42#include <linux/inetdevice.h>
43#include <linux/igmp.h>
44#include <linux/proc_fs.h>
45#include <linux/seq_file.h>
46#include <linux/mroute.h>
47#include <linux/init.h>
48#include <linux/if_ether.h>
49#include <linux/slab.h>
50#include <net/net_namespace.h>
51#include <net/ip.h>
52#include <net/protocol.h>
53#include <linux/skbuff.h>
54#include <net/route.h>
55#include <net/sock.h>
56#include <net/icmp.h>
57#include <net/udp.h>
58#include <net/raw.h>
59#include <linux/notifier.h>
60#include <linux/if_arp.h>
61#include <linux/netfilter_ipv4.h>
62#include <linux/compat.h>
63#include <linux/export.h>
64#include <net/ip_tunnels.h>
65#include <net/checksum.h>
66#include <net/netlink.h>
67#include <net/fib_rules.h>
68#include <linux/netconf.h>
69#include <net/nexthop.h>
70
71struct ipmr_rule {
72 struct fib_rule common;
73};
74
75struct ipmr_result {
76 struct mr_table *mrt;
77};
78
79/* Big lock, protecting vif table, mrt cache and mroute socket state.
80 * Note that the changes are semaphored via rtnl_lock.
81 */
82
83static DEFINE_RWLOCK(mrt_lock);
84
85/* Multicast router control variables */
86
87/* Special spinlock for queue of unresolved entries */
88static DEFINE_SPINLOCK(mfc_unres_lock);
89
90/* We return to original Alan's scheme. Hash table of resolved
91 * entries is changed only in process context and protected
92 * with weak lock mrt_lock. Queue of unresolved entries is protected
93 * with strong spinlock mfc_unres_lock.
94 *
95 * In this case data path is free of exclusive locks at all.
96 */
97
98static struct kmem_cache *mrt_cachep __read_mostly;
99
100static struct mr_table *ipmr_new_table(struct net *net, u32 id);
101static void ipmr_free_table(struct mr_table *mrt);
102
103static void ip_mr_forward(struct net *net, struct mr_table *mrt,
104 struct sk_buff *skb, struct mfc_cache *cache,
105 int local);
106static int ipmr_cache_report(struct mr_table *mrt,
107 struct sk_buff *pkt, vifi_t vifi, int assert);
108static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
109 struct mfc_cache *c, struct rtmsg *rtm);
110static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
111 int cmd);
112static void mroute_clean_tables(struct mr_table *mrt, bool all);
113static void ipmr_expire_process(unsigned long arg);
114
115#ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
116#define ipmr_for_each_table(mrt, net) \
117 list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list)
118
119static struct mr_table *ipmr_get_table(struct net *net, u32 id)
120{
121 struct mr_table *mrt;
122
123 ipmr_for_each_table(mrt, net) {
124 if (mrt->id == id)
125 return mrt;
126 }
127 return NULL;
128}
129
130static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4,
131 struct mr_table **mrt)
132{
133 int err;
134 struct ipmr_result res;
135 struct fib_lookup_arg arg = {
136 .result = &res,
137 .flags = FIB_LOOKUP_NOREF,
138 };
139
140 err = fib_rules_lookup(net->ipv4.mr_rules_ops,
141 flowi4_to_flowi(flp4), 0, &arg);
142 if (err < 0)
143 return err;
144 *mrt = res.mrt;
145 return 0;
146}
147
148static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp,
149 int flags, struct fib_lookup_arg *arg)
150{
151 struct ipmr_result *res = arg->result;
152 struct mr_table *mrt;
153
154 switch (rule->action) {
155 case FR_ACT_TO_TBL:
156 break;
157 case FR_ACT_UNREACHABLE:
158 return -ENETUNREACH;
159 case FR_ACT_PROHIBIT:
160 return -EACCES;
161 case FR_ACT_BLACKHOLE:
162 default:
163 return -EINVAL;
164 }
165
166 mrt = ipmr_get_table(rule->fr_net, rule->table);
167 if (!mrt)
168 return -EAGAIN;
169 res->mrt = mrt;
170 return 0;
171}
172
173static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
174{
175 return 1;
176}
177
178static const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = {
179 FRA_GENERIC_POLICY,
180};
181
182static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
183 struct fib_rule_hdr *frh, struct nlattr **tb)
184{
185 return 0;
186}
187
188static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
189 struct nlattr **tb)
190{
191 return 1;
192}
193
194static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
195 struct fib_rule_hdr *frh)
196{
197 frh->dst_len = 0;
198 frh->src_len = 0;
199 frh->tos = 0;
200 return 0;
201}
202
203static const struct fib_rules_ops __net_initconst ipmr_rules_ops_template = {
204 .family = RTNL_FAMILY_IPMR,
205 .rule_size = sizeof(struct ipmr_rule),
206 .addr_size = sizeof(u32),
207 .action = ipmr_rule_action,
208 .match = ipmr_rule_match,
209 .configure = ipmr_rule_configure,
210 .compare = ipmr_rule_compare,
211 .fill = ipmr_rule_fill,
212 .nlgroup = RTNLGRP_IPV4_RULE,
213 .policy = ipmr_rule_policy,
214 .owner = THIS_MODULE,
215};
216
217static int __net_init ipmr_rules_init(struct net *net)
218{
219 struct fib_rules_ops *ops;
220 struct mr_table *mrt;
221 int err;
222
223 ops = fib_rules_register(&ipmr_rules_ops_template, net);
224 if (IS_ERR(ops))
225 return PTR_ERR(ops);
226
227 INIT_LIST_HEAD(&net->ipv4.mr_tables);
228
229 mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
230 if (IS_ERR(mrt)) {
231 err = PTR_ERR(mrt);
232 goto err1;
233 }
234
235 err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0);
236 if (err < 0)
237 goto err2;
238
239 net->ipv4.mr_rules_ops = ops;
240 return 0;
241
242err2:
243 ipmr_free_table(mrt);
244err1:
245 fib_rules_unregister(ops);
246 return err;
247}
248
249static void __net_exit ipmr_rules_exit(struct net *net)
250{
251 struct mr_table *mrt, *next;
252
253 rtnl_lock();
254 list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) {
255 list_del(&mrt->list);
256 ipmr_free_table(mrt);
257 }
258 fib_rules_unregister(net->ipv4.mr_rules_ops);
259 rtnl_unlock();
260}
261#else
262#define ipmr_for_each_table(mrt, net) \
263 for (mrt = net->ipv4.mrt; mrt; mrt = NULL)
264
265static struct mr_table *ipmr_get_table(struct net *net, u32 id)
266{
267 return net->ipv4.mrt;
268}
269
270static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4,
271 struct mr_table **mrt)
272{
273 *mrt = net->ipv4.mrt;
274 return 0;
275}
276
277static int __net_init ipmr_rules_init(struct net *net)
278{
279 struct mr_table *mrt;
280
281 mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
282 if (IS_ERR(mrt))
283 return PTR_ERR(mrt);
284 net->ipv4.mrt = mrt;
285 return 0;
286}
287
288static void __net_exit ipmr_rules_exit(struct net *net)
289{
290 rtnl_lock();
291 ipmr_free_table(net->ipv4.mrt);
292 net->ipv4.mrt = NULL;
293 rtnl_unlock();
294}
295#endif
296
297static struct mr_table *ipmr_new_table(struct net *net, u32 id)
298{
299 struct mr_table *mrt;
300 unsigned int i;
301
302 /* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */
303 if (id != RT_TABLE_DEFAULT && id >= 1000000000)
304 return ERR_PTR(-EINVAL);
305
306 mrt = ipmr_get_table(net, id);
307 if (mrt)
308 return mrt;
309
310 mrt = kzalloc(sizeof(*mrt), GFP_KERNEL);
311 if (!mrt)
312 return ERR_PTR(-ENOMEM);
313 write_pnet(&mrt->net, net);
314 mrt->id = id;
315
316 /* Forwarding cache */
317 for (i = 0; i < MFC_LINES; i++)
318 INIT_LIST_HEAD(&mrt->mfc_cache_array[i]);
319
320 INIT_LIST_HEAD(&mrt->mfc_unres_queue);
321
322 setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process,
323 (unsigned long)mrt);
324
325 mrt->mroute_reg_vif_num = -1;
326#ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
327 list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables);
328#endif
329 return mrt;
330}
331
332static void ipmr_free_table(struct mr_table *mrt)
333{
334 del_timer_sync(&mrt->ipmr_expire_timer);
335 mroute_clean_tables(mrt, true);
336 kfree(mrt);
337}
338
339/* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */
340
341static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v)
342{
343 struct net *net = dev_net(dev);
344
345 dev_close(dev);
346
347 dev = __dev_get_by_name(net, "tunl0");
348 if (dev) {
349 const struct net_device_ops *ops = dev->netdev_ops;
350 struct ifreq ifr;
351 struct ip_tunnel_parm p;
352
353 memset(&p, 0, sizeof(p));
354 p.iph.daddr = v->vifc_rmt_addr.s_addr;
355 p.iph.saddr = v->vifc_lcl_addr.s_addr;
356 p.iph.version = 4;
357 p.iph.ihl = 5;
358 p.iph.protocol = IPPROTO_IPIP;
359 sprintf(p.name, "dvmrp%d", v->vifc_vifi);
360 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
361
362 if (ops->ndo_do_ioctl) {
363 mm_segment_t oldfs = get_fs();
364
365 set_fs(KERNEL_DS);
366 ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL);
367 set_fs(oldfs);
368 }
369 }
370}
371
372/* Initialize ipmr pimreg/tunnel in_device */
373static bool ipmr_init_vif_indev(const struct net_device *dev)
374{
375 struct in_device *in_dev;
376
377 ASSERT_RTNL();
378
379 in_dev = __in_dev_get_rtnl(dev);
380 if (!in_dev)
381 return false;
382 ipv4_devconf_setall(in_dev);
383 neigh_parms_data_state_setall(in_dev->arp_parms);
384 IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;
385
386 return true;
387}
388
389static struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v)
390{
391 struct net_device *dev;
392
393 dev = __dev_get_by_name(net, "tunl0");
394
395 if (dev) {
396 const struct net_device_ops *ops = dev->netdev_ops;
397 int err;
398 struct ifreq ifr;
399 struct ip_tunnel_parm p;
400
401 memset(&p, 0, sizeof(p));
402 p.iph.daddr = v->vifc_rmt_addr.s_addr;
403 p.iph.saddr = v->vifc_lcl_addr.s_addr;
404 p.iph.version = 4;
405 p.iph.ihl = 5;
406 p.iph.protocol = IPPROTO_IPIP;
407 sprintf(p.name, "dvmrp%d", v->vifc_vifi);
408 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
409
410 if (ops->ndo_do_ioctl) {
411 mm_segment_t oldfs = get_fs();
412
413 set_fs(KERNEL_DS);
414 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
415 set_fs(oldfs);
416 } else {
417 err = -EOPNOTSUPP;
418 }
419 dev = NULL;
420
421 if (err == 0 &&
422 (dev = __dev_get_by_name(net, p.name)) != NULL) {
423 dev->flags |= IFF_MULTICAST;
424 if (!ipmr_init_vif_indev(dev))
425 goto failure;
426 if (dev_open(dev))
427 goto failure;
428 dev_hold(dev);
429 }
430 }
431 return dev;
432
433failure:
434 unregister_netdevice(dev);
435 return NULL;
436}
437
438#if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2)
439static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev)
440{
441 struct net *net = dev_net(dev);
442 struct mr_table *mrt;
443 struct flowi4 fl4 = {
444 .flowi4_oif = dev->ifindex,
445 .flowi4_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
446 .flowi4_mark = skb->mark,
447 };
448 int err;
449
450 err = ipmr_fib_lookup(net, &fl4, &mrt);
451 if (err < 0) {
452 kfree_skb(skb);
453 return err;
454 }
455
456 read_lock(&mrt_lock);
457 dev->stats.tx_bytes += skb->len;
458 dev->stats.tx_packets++;
459 ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT);
460 read_unlock(&mrt_lock);
461 kfree_skb(skb);
462 return NETDEV_TX_OK;
463}
464
465static int reg_vif_get_iflink(const struct net_device *dev)
466{
467 return 0;
468}
469
470static const struct net_device_ops reg_vif_netdev_ops = {
471 .ndo_start_xmit = reg_vif_xmit,
472 .ndo_get_iflink = reg_vif_get_iflink,
473};
474
475static void reg_vif_setup(struct net_device *dev)
476{
477 dev->type = ARPHRD_PIMREG;
478 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8;
479 dev->flags = IFF_NOARP;
480 dev->netdev_ops = ®_vif_netdev_ops;
481 dev->destructor = free_netdev;
482 dev->features |= NETIF_F_NETNS_LOCAL;
483}
484
485static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
486{
487 struct net_device *dev;
488 char name[IFNAMSIZ];
489
490 if (mrt->id == RT_TABLE_DEFAULT)
491 sprintf(name, "pimreg");
492 else
493 sprintf(name, "pimreg%u", mrt->id);
494
495 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup);
496
497 if (!dev)
498 return NULL;
499
500 dev_net_set(dev, net);
501
502 if (register_netdevice(dev)) {
503 free_netdev(dev);
504 return NULL;
505 }
506
507 if (!ipmr_init_vif_indev(dev))
508 goto failure;
509 if (dev_open(dev))
510 goto failure;
511
512 dev_hold(dev);
513
514 return dev;
515
516failure:
517 unregister_netdevice(dev);
518 return NULL;
519}
520
521/* called with rcu_read_lock() */
522static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb,
523 unsigned int pimlen)
524{
525 struct net_device *reg_dev = NULL;
526 struct iphdr *encap;
527
528 encap = (struct iphdr *)(skb_transport_header(skb) + pimlen);
529 /* Check that:
530 * a. packet is really sent to a multicast group
531 * b. packet is not a NULL-REGISTER
532 * c. packet is not truncated
533 */
534 if (!ipv4_is_multicast(encap->daddr) ||
535 encap->tot_len == 0 ||
536 ntohs(encap->tot_len) + pimlen > skb->len)
537 return 1;
538
539 read_lock(&mrt_lock);
540 if (mrt->mroute_reg_vif_num >= 0)
541 reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev;
542 read_unlock(&mrt_lock);
543
544 if (!reg_dev)
545 return 1;
546
547 skb->mac_header = skb->network_header;
548 skb_pull(skb, (u8 *)encap - skb->data);
549 skb_reset_network_header(skb);
550 skb->protocol = htons(ETH_P_IP);
551 skb->ip_summed = CHECKSUM_NONE;
552
553 skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
554
555 netif_rx(skb);
556
557 return NET_RX_SUCCESS;
558}
559#else
560static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
561{
562 return NULL;
563}
564#endif
565
566/**
567 * vif_delete - Delete a VIF entry
568 * @notify: Set to 1, if the caller is a notifier_call
569 */
570static int vif_delete(struct mr_table *mrt, int vifi, int notify,
571 struct list_head *head)
572{
573 struct vif_device *v;
574 struct net_device *dev;
575 struct in_device *in_dev;
576
577 if (vifi < 0 || vifi >= mrt->maxvif)
578 return -EADDRNOTAVAIL;
579
580 v = &mrt->vif_table[vifi];
581
582 write_lock_bh(&mrt_lock);
583 dev = v->dev;
584 v->dev = NULL;
585
586 if (!dev) {
587 write_unlock_bh(&mrt_lock);
588 return -EADDRNOTAVAIL;
589 }
590
591 if (vifi == mrt->mroute_reg_vif_num)
592 mrt->mroute_reg_vif_num = -1;
593
594 if (vifi + 1 == mrt->maxvif) {
595 int tmp;
596
597 for (tmp = vifi - 1; tmp >= 0; tmp--) {
598 if (VIF_EXISTS(mrt, tmp))
599 break;
600 }
601 mrt->maxvif = tmp+1;
602 }
603
604 write_unlock_bh(&mrt_lock);
605
606 dev_set_allmulti(dev, -1);
607
608 in_dev = __in_dev_get_rtnl(dev);
609 if (in_dev) {
610 IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--;
611 inet_netconf_notify_devconf(dev_net(dev),
612 NETCONFA_MC_FORWARDING,
613 dev->ifindex, &in_dev->cnf);
614 ip_rt_multicast_event(in_dev);
615 }
616
617 if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify)
618 unregister_netdevice_queue(dev, head);
619
620 dev_put(dev);
621 return 0;
622}
623
624static void ipmr_cache_free_rcu(struct rcu_head *head)
625{
626 struct mfc_cache *c = container_of(head, struct mfc_cache, rcu);
627
628 kmem_cache_free(mrt_cachep, c);
629}
630
631static inline void ipmr_cache_free(struct mfc_cache *c)
632{
633 call_rcu(&c->rcu, ipmr_cache_free_rcu);
634}
635
636/* Destroy an unresolved cache entry, killing queued skbs
637 * and reporting error to netlink readers.
638 */
639static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c)
640{
641 struct net *net = read_pnet(&mrt->net);
642 struct sk_buff *skb;
643 struct nlmsgerr *e;
644
645 atomic_dec(&mrt->cache_resolve_queue_len);
646
647 while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) {
648 if (ip_hdr(skb)->version == 0) {
649 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
650 nlh->nlmsg_type = NLMSG_ERROR;
651 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
652 skb_trim(skb, nlh->nlmsg_len);
653 e = nlmsg_data(nlh);
654 e->error = -ETIMEDOUT;
655 memset(&e->msg, 0, sizeof(e->msg));
656
657 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
658 } else {
659 kfree_skb(skb);
660 }
661 }
662
663 ipmr_cache_free(c);
664}
665
666/* Timer process for the unresolved queue. */
667static void ipmr_expire_process(unsigned long arg)
668{
669 struct mr_table *mrt = (struct mr_table *)arg;
670 unsigned long now;
671 unsigned long expires;
672 struct mfc_cache *c, *next;
673
674 if (!spin_trylock(&mfc_unres_lock)) {
675 mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10);
676 return;
677 }
678
679 if (list_empty(&mrt->mfc_unres_queue))
680 goto out;
681
682 now = jiffies;
683 expires = 10*HZ;
684
685 list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
686 if (time_after(c->mfc_un.unres.expires, now)) {
687 unsigned long interval = c->mfc_un.unres.expires - now;
688 if (interval < expires)
689 expires = interval;
690 continue;
691 }
692
693 list_del(&c->list);
694 mroute_netlink_event(mrt, c, RTM_DELROUTE);
695 ipmr_destroy_unres(mrt, c);
696 }
697
698 if (!list_empty(&mrt->mfc_unres_queue))
699 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
700
701out:
702 spin_unlock(&mfc_unres_lock);
703}
704
705/* Fill oifs list. It is called under write locked mrt_lock. */
706static void ipmr_update_thresholds(struct mr_table *mrt, struct mfc_cache *cache,
707 unsigned char *ttls)
708{
709 int vifi;
710
711 cache->mfc_un.res.minvif = MAXVIFS;
712 cache->mfc_un.res.maxvif = 0;
713 memset(cache->mfc_un.res.ttls, 255, MAXVIFS);
714
715 for (vifi = 0; vifi < mrt->maxvif; vifi++) {
716 if (VIF_EXISTS(mrt, vifi) &&
717 ttls[vifi] && ttls[vifi] < 255) {
718 cache->mfc_un.res.ttls[vifi] = ttls[vifi];
719 if (cache->mfc_un.res.minvif > vifi)
720 cache->mfc_un.res.minvif = vifi;
721 if (cache->mfc_un.res.maxvif <= vifi)
722 cache->mfc_un.res.maxvif = vifi + 1;
723 }
724 }
725}
726
727static int vif_add(struct net *net, struct mr_table *mrt,
728 struct vifctl *vifc, int mrtsock)
729{
730 int vifi = vifc->vifc_vifi;
731 struct vif_device *v = &mrt->vif_table[vifi];
732 struct net_device *dev;
733 struct in_device *in_dev;
734 int err;
735
736 /* Is vif busy ? */
737 if (VIF_EXISTS(mrt, vifi))
738 return -EADDRINUSE;
739
740 switch (vifc->vifc_flags) {
741 case VIFF_REGISTER:
742 if (!ipmr_pimsm_enabled())
743 return -EINVAL;
744 /* Special Purpose VIF in PIM
745 * All the packets will be sent to the daemon
746 */
747 if (mrt->mroute_reg_vif_num >= 0)
748 return -EADDRINUSE;
749 dev = ipmr_reg_vif(net, mrt);
750 if (!dev)
751 return -ENOBUFS;
752 err = dev_set_allmulti(dev, 1);
753 if (err) {
754 unregister_netdevice(dev);
755 dev_put(dev);
756 return err;
757 }
758 break;
759 case VIFF_TUNNEL:
760 dev = ipmr_new_tunnel(net, vifc);
761 if (!dev)
762 return -ENOBUFS;
763 err = dev_set_allmulti(dev, 1);
764 if (err) {
765 ipmr_del_tunnel(dev, vifc);
766 dev_put(dev);
767 return err;
768 }
769 break;
770 case VIFF_USE_IFINDEX:
771 case 0:
772 if (vifc->vifc_flags == VIFF_USE_IFINDEX) {
773 dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex);
774 if (dev && !__in_dev_get_rtnl(dev)) {
775 dev_put(dev);
776 return -EADDRNOTAVAIL;
777 }
778 } else {
779 dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr);
780 }
781 if (!dev)
782 return -EADDRNOTAVAIL;
783 err = dev_set_allmulti(dev, 1);
784 if (err) {
785 dev_put(dev);
786 return err;
787 }
788 break;
789 default:
790 return -EINVAL;
791 }
792
793 in_dev = __in_dev_get_rtnl(dev);
794 if (!in_dev) {
795 dev_put(dev);
796 return -EADDRNOTAVAIL;
797 }
798 IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++;
799 inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING, dev->ifindex,
800 &in_dev->cnf);
801 ip_rt_multicast_event(in_dev);
802
803 /* Fill in the VIF structures */
804
805 v->rate_limit = vifc->vifc_rate_limit;
806 v->local = vifc->vifc_lcl_addr.s_addr;
807 v->remote = vifc->vifc_rmt_addr.s_addr;
808 v->flags = vifc->vifc_flags;
809 if (!mrtsock)
810 v->flags |= VIFF_STATIC;
811 v->threshold = vifc->vifc_threshold;
812 v->bytes_in = 0;
813 v->bytes_out = 0;
814 v->pkt_in = 0;
815 v->pkt_out = 0;
816 v->link = dev->ifindex;
817 if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER))
818 v->link = dev_get_iflink(dev);
819
820 /* And finish update writing critical data */
821 write_lock_bh(&mrt_lock);
822 v->dev = dev;
823 if (v->flags & VIFF_REGISTER)
824 mrt->mroute_reg_vif_num = vifi;
825 if (vifi+1 > mrt->maxvif)
826 mrt->maxvif = vifi+1;
827 write_unlock_bh(&mrt_lock);
828 return 0;
829}
830
831/* called with rcu_read_lock() */
832static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt,
833 __be32 origin,
834 __be32 mcastgrp)
835{
836 int line = MFC_HASH(mcastgrp, origin);
837 struct mfc_cache *c;
838
839 list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) {
840 if (c->mfc_origin == origin && c->mfc_mcastgrp == mcastgrp)
841 return c;
842 }
843 return NULL;
844}
845
846/* Look for a (*,*,oif) entry */
847static struct mfc_cache *ipmr_cache_find_any_parent(struct mr_table *mrt,
848 int vifi)
849{
850 int line = MFC_HASH(htonl(INADDR_ANY), htonl(INADDR_ANY));
851 struct mfc_cache *c;
852
853 list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list)
854 if (c->mfc_origin == htonl(INADDR_ANY) &&
855 c->mfc_mcastgrp == htonl(INADDR_ANY) &&
856 c->mfc_un.res.ttls[vifi] < 255)
857 return c;
858
859 return NULL;
860}
861
862/* Look for a (*,G) entry */
863static struct mfc_cache *ipmr_cache_find_any(struct mr_table *mrt,
864 __be32 mcastgrp, int vifi)
865{
866 int line = MFC_HASH(mcastgrp, htonl(INADDR_ANY));
867 struct mfc_cache *c, *proxy;
868
869 if (mcastgrp == htonl(INADDR_ANY))
870 goto skip;
871
872 list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list)
873 if (c->mfc_origin == htonl(INADDR_ANY) &&
874 c->mfc_mcastgrp == mcastgrp) {
875 if (c->mfc_un.res.ttls[vifi] < 255)
876 return c;
877
878 /* It's ok if the vifi is part of the static tree */
879 proxy = ipmr_cache_find_any_parent(mrt,
880 c->mfc_parent);
881 if (proxy && proxy->mfc_un.res.ttls[vifi] < 255)
882 return c;
883 }
884
885skip:
886 return ipmr_cache_find_any_parent(mrt, vifi);
887}
888
889/* Allocate a multicast cache entry */
890static struct mfc_cache *ipmr_cache_alloc(void)
891{
892 struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
893
894 if (c)
895 c->mfc_un.res.minvif = MAXVIFS;
896 return c;
897}
898
899static struct mfc_cache *ipmr_cache_alloc_unres(void)
900{
901 struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
902
903 if (c) {
904 skb_queue_head_init(&c->mfc_un.unres.unresolved);
905 c->mfc_un.unres.expires = jiffies + 10*HZ;
906 }
907 return c;
908}
909
910/* A cache entry has gone into a resolved state from queued */
911static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt,
912 struct mfc_cache *uc, struct mfc_cache *c)
913{
914 struct sk_buff *skb;
915 struct nlmsgerr *e;
916
917 /* Play the pending entries through our router */
918 while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
919 if (ip_hdr(skb)->version == 0) {
920 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
921
922 if (__ipmr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) {
923 nlh->nlmsg_len = skb_tail_pointer(skb) -
924 (u8 *)nlh;
925 } else {
926 nlh->nlmsg_type = NLMSG_ERROR;
927 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
928 skb_trim(skb, nlh->nlmsg_len);
929 e = nlmsg_data(nlh);
930 e->error = -EMSGSIZE;
931 memset(&e->msg, 0, sizeof(e->msg));
932 }
933
934 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
935 } else {
936 ip_mr_forward(net, mrt, skb, c, 0);
937 }
938 }
939}
940
941/* Bounce a cache query up to mrouted. We could use netlink for this but mrouted
942 * expects the following bizarre scheme.
943 *
944 * Called under mrt_lock.
945 */
946static int ipmr_cache_report(struct mr_table *mrt,
947 struct sk_buff *pkt, vifi_t vifi, int assert)
948{
949 const int ihl = ip_hdrlen(pkt);
950 struct sock *mroute_sk;
951 struct igmphdr *igmp;
952 struct igmpmsg *msg;
953 struct sk_buff *skb;
954 int ret;
955
956 if (assert == IGMPMSG_WHOLEPKT)
957 skb = skb_realloc_headroom(pkt, sizeof(struct iphdr));
958 else
959 skb = alloc_skb(128, GFP_ATOMIC);
960
961 if (!skb)
962 return -ENOBUFS;
963
964 if (assert == IGMPMSG_WHOLEPKT) {
965 /* Ugly, but we have no choice with this interface.
966 * Duplicate old header, fix ihl, length etc.
967 * And all this only to mangle msg->im_msgtype and
968 * to set msg->im_mbz to "mbz" :-)
969 */
970 skb_push(skb, sizeof(struct iphdr));
971 skb_reset_network_header(skb);
972 skb_reset_transport_header(skb);
973 msg = (struct igmpmsg *)skb_network_header(skb);
974 memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr));
975 msg->im_msgtype = IGMPMSG_WHOLEPKT;
976 msg->im_mbz = 0;
977 msg->im_vif = mrt->mroute_reg_vif_num;
978 ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2;
979 ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) +
980 sizeof(struct iphdr));
981 } else {
982 /* Copy the IP header */
983 skb_set_network_header(skb, skb->len);
984 skb_put(skb, ihl);
985 skb_copy_to_linear_data(skb, pkt->data, ihl);
986 /* Flag to the kernel this is a route add */
987 ip_hdr(skb)->protocol = 0;
988 msg = (struct igmpmsg *)skb_network_header(skb);
989 msg->im_vif = vifi;
990 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
991 /* Add our header */
992 igmp = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
993 igmp->type = assert;
994 msg->im_msgtype = assert;
995 igmp->code = 0;
996 ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */
997 skb->transport_header = skb->network_header;
998 }
999
1000 rcu_read_lock();
1001 mroute_sk = rcu_dereference(mrt->mroute_sk);
1002 if (!mroute_sk) {
1003 rcu_read_unlock();
1004 kfree_skb(skb);
1005 return -EINVAL;
1006 }
1007
1008 /* Deliver to mrouted */
1009 ret = sock_queue_rcv_skb(mroute_sk, skb);
1010 rcu_read_unlock();
1011 if (ret < 0) {
1012 net_warn_ratelimited("mroute: pending queue full, dropping entries\n");
1013 kfree_skb(skb);
1014 }
1015
1016 return ret;
1017}
1018
1019/* Queue a packet for resolution. It gets locked cache entry! */
1020static int ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi,
1021 struct sk_buff *skb)
1022{
1023 bool found = false;
1024 int err;
1025 struct mfc_cache *c;
1026 const struct iphdr *iph = ip_hdr(skb);
1027
1028 spin_lock_bh(&mfc_unres_lock);
1029 list_for_each_entry(c, &mrt->mfc_unres_queue, list) {
1030 if (c->mfc_mcastgrp == iph->daddr &&
1031 c->mfc_origin == iph->saddr) {
1032 found = true;
1033 break;
1034 }
1035 }
1036
1037 if (!found) {
1038 /* Create a new entry if allowable */
1039 if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
1040 (c = ipmr_cache_alloc_unres()) == NULL) {
1041 spin_unlock_bh(&mfc_unres_lock);
1042
1043 kfree_skb(skb);
1044 return -ENOBUFS;
1045 }
1046
1047 /* Fill in the new cache entry */
1048 c->mfc_parent = -1;
1049 c->mfc_origin = iph->saddr;
1050 c->mfc_mcastgrp = iph->daddr;
1051
1052 /* Reflect first query at mrouted. */
1053 err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE);
1054 if (err < 0) {
1055 /* If the report failed throw the cache entry
1056 out - Brad Parker
1057 */
1058 spin_unlock_bh(&mfc_unres_lock);
1059
1060 ipmr_cache_free(c);
1061 kfree_skb(skb);
1062 return err;
1063 }
1064
1065 atomic_inc(&mrt->cache_resolve_queue_len);
1066 list_add(&c->list, &mrt->mfc_unres_queue);
1067 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1068
1069 if (atomic_read(&mrt->cache_resolve_queue_len) == 1)
1070 mod_timer(&mrt->ipmr_expire_timer, c->mfc_un.unres.expires);
1071 }
1072
1073 /* See if we can append the packet */
1074 if (c->mfc_un.unres.unresolved.qlen > 3) {
1075 kfree_skb(skb);
1076 err = -ENOBUFS;
1077 } else {
1078 skb_queue_tail(&c->mfc_un.unres.unresolved, skb);
1079 err = 0;
1080 }
1081
1082 spin_unlock_bh(&mfc_unres_lock);
1083 return err;
1084}
1085
1086/* MFC cache manipulation by user space mroute daemon */
1087
1088static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent)
1089{
1090 int line;
1091 struct mfc_cache *c, *next;
1092
1093 line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr);
1094
1095 list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[line], list) {
1096 if (c->mfc_origin == mfc->mfcc_origin.s_addr &&
1097 c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr &&
1098 (parent == -1 || parent == c->mfc_parent)) {
1099 list_del_rcu(&c->list);
1100 mroute_netlink_event(mrt, c, RTM_DELROUTE);
1101 ipmr_cache_free(c);
1102 return 0;
1103 }
1104 }
1105 return -ENOENT;
1106}
1107
1108static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
1109 struct mfcctl *mfc, int mrtsock, int parent)
1110{
1111 bool found = false;
1112 int line;
1113 struct mfc_cache *uc, *c;
1114
1115 if (mfc->mfcc_parent >= MAXVIFS)
1116 return -ENFILE;
1117
1118 line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr);
1119
1120 list_for_each_entry(c, &mrt->mfc_cache_array[line], list) {
1121 if (c->mfc_origin == mfc->mfcc_origin.s_addr &&
1122 c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr &&
1123 (parent == -1 || parent == c->mfc_parent)) {
1124 found = true;
1125 break;
1126 }
1127 }
1128
1129 if (found) {
1130 write_lock_bh(&mrt_lock);
1131 c->mfc_parent = mfc->mfcc_parent;
1132 ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls);
1133 if (!mrtsock)
1134 c->mfc_flags |= MFC_STATIC;
1135 write_unlock_bh(&mrt_lock);
1136 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1137 return 0;
1138 }
1139
1140 if (mfc->mfcc_mcastgrp.s_addr != htonl(INADDR_ANY) &&
1141 !ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr))
1142 return -EINVAL;
1143
1144 c = ipmr_cache_alloc();
1145 if (!c)
1146 return -ENOMEM;
1147
1148 c->mfc_origin = mfc->mfcc_origin.s_addr;
1149 c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr;
1150 c->mfc_parent = mfc->mfcc_parent;
1151 ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls);
1152 if (!mrtsock)
1153 c->mfc_flags |= MFC_STATIC;
1154
1155 list_add_rcu(&c->list, &mrt->mfc_cache_array[line]);
1156
1157 /* Check to see if we resolved a queued list. If so we
1158 * need to send on the frames and tidy up.
1159 */
1160 found = false;
1161 spin_lock_bh(&mfc_unres_lock);
1162 list_for_each_entry(uc, &mrt->mfc_unres_queue, list) {
1163 if (uc->mfc_origin == c->mfc_origin &&
1164 uc->mfc_mcastgrp == c->mfc_mcastgrp) {
1165 list_del(&uc->list);
1166 atomic_dec(&mrt->cache_resolve_queue_len);
1167 found = true;
1168 break;
1169 }
1170 }
1171 if (list_empty(&mrt->mfc_unres_queue))
1172 del_timer(&mrt->ipmr_expire_timer);
1173 spin_unlock_bh(&mfc_unres_lock);
1174
1175 if (found) {
1176 ipmr_cache_resolve(net, mrt, uc, c);
1177 ipmr_cache_free(uc);
1178 }
1179 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1180 return 0;
1181}
1182
1183/* Close the multicast socket, and clear the vif tables etc */
1184static void mroute_clean_tables(struct mr_table *mrt, bool all)
1185{
1186 int i;
1187 LIST_HEAD(list);
1188 struct mfc_cache *c, *next;
1189
1190 /* Shut down all active vif entries */
1191 for (i = 0; i < mrt->maxvif; i++) {
1192 if (!all && (mrt->vif_table[i].flags & VIFF_STATIC))
1193 continue;
1194 vif_delete(mrt, i, 0, &list);
1195 }
1196 unregister_netdevice_many(&list);
1197
1198 /* Wipe the cache */
1199 for (i = 0; i < MFC_LINES; i++) {
1200 list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[i], list) {
1201 if (!all && (c->mfc_flags & MFC_STATIC))
1202 continue;
1203 list_del_rcu(&c->list);
1204 mroute_netlink_event(mrt, c, RTM_DELROUTE);
1205 ipmr_cache_free(c);
1206 }
1207 }
1208
1209 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1210 spin_lock_bh(&mfc_unres_lock);
1211 list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
1212 list_del(&c->list);
1213 mroute_netlink_event(mrt, c, RTM_DELROUTE);
1214 ipmr_destroy_unres(mrt, c);
1215 }
1216 spin_unlock_bh(&mfc_unres_lock);
1217 }
1218}
1219
1220/* called from ip_ra_control(), before an RCU grace period,
1221 * we dont need to call synchronize_rcu() here
1222 */
1223static void mrtsock_destruct(struct sock *sk)
1224{
1225 struct net *net = sock_net(sk);
1226 struct mr_table *mrt;
1227
1228 rtnl_lock();
1229 ipmr_for_each_table(mrt, net) {
1230 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1231 IPV4_DEVCONF_ALL(net, MC_FORWARDING)--;
1232 inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING,
1233 NETCONFA_IFINDEX_ALL,
1234 net->ipv4.devconf_all);
1235 RCU_INIT_POINTER(mrt->mroute_sk, NULL);
1236 mroute_clean_tables(mrt, false);
1237 }
1238 }
1239 rtnl_unlock();
1240}
1241
1242/* Socket options and virtual interface manipulation. The whole
1243 * virtual interface system is a complete heap, but unfortunately
1244 * that's how BSD mrouted happens to think. Maybe one day with a proper
1245 * MOSPF/PIM router set up we can clean this up.
1246 */
1247
1248int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval,
1249 unsigned int optlen)
1250{
1251 struct net *net = sock_net(sk);
1252 int val, ret = 0, parent = 0;
1253 struct mr_table *mrt;
1254 struct vifctl vif;
1255 struct mfcctl mfc;
1256 u32 uval;
1257
1258 /* There's one exception to the lock - MRT_DONE which needs to unlock */
1259 rtnl_lock();
1260 if (sk->sk_type != SOCK_RAW ||
1261 inet_sk(sk)->inet_num != IPPROTO_IGMP) {
1262 ret = -EOPNOTSUPP;
1263 goto out_unlock;
1264 }
1265
1266 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1267 if (!mrt) {
1268 ret = -ENOENT;
1269 goto out_unlock;
1270 }
1271 if (optname != MRT_INIT) {
1272 if (sk != rcu_access_pointer(mrt->mroute_sk) &&
1273 !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
1274 ret = -EACCES;
1275 goto out_unlock;
1276 }
1277 }
1278
1279 switch (optname) {
1280 case MRT_INIT:
1281 if (optlen != sizeof(int)) {
1282 ret = -EINVAL;
1283 break;
1284 }
1285 if (rtnl_dereference(mrt->mroute_sk)) {
1286 ret = -EADDRINUSE;
1287 break;
1288 }
1289
1290 ret = ip_ra_control(sk, 1, mrtsock_destruct);
1291 if (ret == 0) {
1292 rcu_assign_pointer(mrt->mroute_sk, sk);
1293 IPV4_DEVCONF_ALL(net, MC_FORWARDING)++;
1294 inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING,
1295 NETCONFA_IFINDEX_ALL,
1296 net->ipv4.devconf_all);
1297 }
1298 break;
1299 case MRT_DONE:
1300 if (sk != rcu_access_pointer(mrt->mroute_sk)) {
1301 ret = -EACCES;
1302 } else {
1303 /* We need to unlock here because mrtsock_destruct takes
1304 * care of rtnl itself and we can't change that due to
1305 * the IP_ROUTER_ALERT setsockopt which runs without it.
1306 */
1307 rtnl_unlock();
1308 ret = ip_ra_control(sk, 0, NULL);
1309 goto out;
1310 }
1311 break;
1312 case MRT_ADD_VIF:
1313 case MRT_DEL_VIF:
1314 if (optlen != sizeof(vif)) {
1315 ret = -EINVAL;
1316 break;
1317 }
1318 if (copy_from_user(&vif, optval, sizeof(vif))) {
1319 ret = -EFAULT;
1320 break;
1321 }
1322 if (vif.vifc_vifi >= MAXVIFS) {
1323 ret = -ENFILE;
1324 break;
1325 }
1326 if (optname == MRT_ADD_VIF) {
1327 ret = vif_add(net, mrt, &vif,
1328 sk == rtnl_dereference(mrt->mroute_sk));
1329 } else {
1330 ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL);
1331 }
1332 break;
1333 /* Manipulate the forwarding caches. These live
1334 * in a sort of kernel/user symbiosis.
1335 */
1336 case MRT_ADD_MFC:
1337 case MRT_DEL_MFC:
1338 parent = -1;
1339 case MRT_ADD_MFC_PROXY:
1340 case MRT_DEL_MFC_PROXY:
1341 if (optlen != sizeof(mfc)) {
1342 ret = -EINVAL;
1343 break;
1344 }
1345 if (copy_from_user(&mfc, optval, sizeof(mfc))) {
1346 ret = -EFAULT;
1347 break;
1348 }
1349 if (parent == 0)
1350 parent = mfc.mfcc_parent;
1351 if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY)
1352 ret = ipmr_mfc_delete(mrt, &mfc, parent);
1353 else
1354 ret = ipmr_mfc_add(net, mrt, &mfc,
1355 sk == rtnl_dereference(mrt->mroute_sk),
1356 parent);
1357 break;
1358 /* Control PIM assert. */
1359 case MRT_ASSERT:
1360 if (optlen != sizeof(val)) {
1361 ret = -EINVAL;
1362 break;
1363 }
1364 if (get_user(val, (int __user *)optval)) {
1365 ret = -EFAULT;
1366 break;
1367 }
1368 mrt->mroute_do_assert = val;
1369 break;
1370 case MRT_PIM:
1371 if (!ipmr_pimsm_enabled()) {
1372 ret = -ENOPROTOOPT;
1373 break;
1374 }
1375 if (optlen != sizeof(val)) {
1376 ret = -EINVAL;
1377 break;
1378 }
1379 if (get_user(val, (int __user *)optval)) {
1380 ret = -EFAULT;
1381 break;
1382 }
1383
1384 val = !!val;
1385 if (val != mrt->mroute_do_pim) {
1386 mrt->mroute_do_pim = val;
1387 mrt->mroute_do_assert = val;
1388 }
1389 break;
1390 case MRT_TABLE:
1391 if (!IS_BUILTIN(CONFIG_IP_MROUTE_MULTIPLE_TABLES)) {
1392 ret = -ENOPROTOOPT;
1393 break;
1394 }
1395 if (optlen != sizeof(uval)) {
1396 ret = -EINVAL;
1397 break;
1398 }
1399 if (get_user(uval, (u32 __user *)optval)) {
1400 ret = -EFAULT;
1401 break;
1402 }
1403
1404 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1405 ret = -EBUSY;
1406 } else {
1407 mrt = ipmr_new_table(net, uval);
1408 if (IS_ERR(mrt))
1409 ret = PTR_ERR(mrt);
1410 else
1411 raw_sk(sk)->ipmr_table = uval;
1412 }
1413 break;
1414 /* Spurious command, or MRT_VERSION which you cannot set. */
1415 default:
1416 ret = -ENOPROTOOPT;
1417 }
1418out_unlock:
1419 rtnl_unlock();
1420out:
1421 return ret;
1422}
1423
1424/* Getsock opt support for the multicast routing system. */
1425int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen)
1426{
1427 int olr;
1428 int val;
1429 struct net *net = sock_net(sk);
1430 struct mr_table *mrt;
1431
1432 if (sk->sk_type != SOCK_RAW ||
1433 inet_sk(sk)->inet_num != IPPROTO_IGMP)
1434 return -EOPNOTSUPP;
1435
1436 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1437 if (!mrt)
1438 return -ENOENT;
1439
1440 switch (optname) {
1441 case MRT_VERSION:
1442 val = 0x0305;
1443 break;
1444 case MRT_PIM:
1445 if (!ipmr_pimsm_enabled())
1446 return -ENOPROTOOPT;
1447 val = mrt->mroute_do_pim;
1448 break;
1449 case MRT_ASSERT:
1450 val = mrt->mroute_do_assert;
1451 break;
1452 default:
1453 return -ENOPROTOOPT;
1454 }
1455
1456 if (get_user(olr, optlen))
1457 return -EFAULT;
1458 olr = min_t(unsigned int, olr, sizeof(int));
1459 if (olr < 0)
1460 return -EINVAL;
1461 if (put_user(olr, optlen))
1462 return -EFAULT;
1463 if (copy_to_user(optval, &val, olr))
1464 return -EFAULT;
1465 return 0;
1466}
1467
1468/* The IP multicast ioctl support routines. */
1469int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg)
1470{
1471 struct sioc_sg_req sr;
1472 struct sioc_vif_req vr;
1473 struct vif_device *vif;
1474 struct mfc_cache *c;
1475 struct net *net = sock_net(sk);
1476 struct mr_table *mrt;
1477
1478 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1479 if (!mrt)
1480 return -ENOENT;
1481
1482 switch (cmd) {
1483 case SIOCGETVIFCNT:
1484 if (copy_from_user(&vr, arg, sizeof(vr)))
1485 return -EFAULT;
1486 if (vr.vifi >= mrt->maxvif)
1487 return -EINVAL;
1488 read_lock(&mrt_lock);
1489 vif = &mrt->vif_table[vr.vifi];
1490 if (VIF_EXISTS(mrt, vr.vifi)) {
1491 vr.icount = vif->pkt_in;
1492 vr.ocount = vif->pkt_out;
1493 vr.ibytes = vif->bytes_in;
1494 vr.obytes = vif->bytes_out;
1495 read_unlock(&mrt_lock);
1496
1497 if (copy_to_user(arg, &vr, sizeof(vr)))
1498 return -EFAULT;
1499 return 0;
1500 }
1501 read_unlock(&mrt_lock);
1502 return -EADDRNOTAVAIL;
1503 case SIOCGETSGCNT:
1504 if (copy_from_user(&sr, arg, sizeof(sr)))
1505 return -EFAULT;
1506
1507 rcu_read_lock();
1508 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
1509 if (c) {
1510 sr.pktcnt = c->mfc_un.res.pkt;
1511 sr.bytecnt = c->mfc_un.res.bytes;
1512 sr.wrong_if = c->mfc_un.res.wrong_if;
1513 rcu_read_unlock();
1514
1515 if (copy_to_user(arg, &sr, sizeof(sr)))
1516 return -EFAULT;
1517 return 0;
1518 }
1519 rcu_read_unlock();
1520 return -EADDRNOTAVAIL;
1521 default:
1522 return -ENOIOCTLCMD;
1523 }
1524}
1525
1526#ifdef CONFIG_COMPAT
1527struct compat_sioc_sg_req {
1528 struct in_addr src;
1529 struct in_addr grp;
1530 compat_ulong_t pktcnt;
1531 compat_ulong_t bytecnt;
1532 compat_ulong_t wrong_if;
1533};
1534
1535struct compat_sioc_vif_req {
1536 vifi_t vifi; /* Which iface */
1537 compat_ulong_t icount;
1538 compat_ulong_t ocount;
1539 compat_ulong_t ibytes;
1540 compat_ulong_t obytes;
1541};
1542
1543int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1544{
1545 struct compat_sioc_sg_req sr;
1546 struct compat_sioc_vif_req vr;
1547 struct vif_device *vif;
1548 struct mfc_cache *c;
1549 struct net *net = sock_net(sk);
1550 struct mr_table *mrt;
1551
1552 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1553 if (!mrt)
1554 return -ENOENT;
1555
1556 switch (cmd) {
1557 case SIOCGETVIFCNT:
1558 if (copy_from_user(&vr, arg, sizeof(vr)))
1559 return -EFAULT;
1560 if (vr.vifi >= mrt->maxvif)
1561 return -EINVAL;
1562 read_lock(&mrt_lock);
1563 vif = &mrt->vif_table[vr.vifi];
1564 if (VIF_EXISTS(mrt, vr.vifi)) {
1565 vr.icount = vif->pkt_in;
1566 vr.ocount = vif->pkt_out;
1567 vr.ibytes = vif->bytes_in;
1568 vr.obytes = vif->bytes_out;
1569 read_unlock(&mrt_lock);
1570
1571 if (copy_to_user(arg, &vr, sizeof(vr)))
1572 return -EFAULT;
1573 return 0;
1574 }
1575 read_unlock(&mrt_lock);
1576 return -EADDRNOTAVAIL;
1577 case SIOCGETSGCNT:
1578 if (copy_from_user(&sr, arg, sizeof(sr)))
1579 return -EFAULT;
1580
1581 rcu_read_lock();
1582 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
1583 if (c) {
1584 sr.pktcnt = c->mfc_un.res.pkt;
1585 sr.bytecnt = c->mfc_un.res.bytes;
1586 sr.wrong_if = c->mfc_un.res.wrong_if;
1587 rcu_read_unlock();
1588
1589 if (copy_to_user(arg, &sr, sizeof(sr)))
1590 return -EFAULT;
1591 return 0;
1592 }
1593 rcu_read_unlock();
1594 return -EADDRNOTAVAIL;
1595 default:
1596 return -ENOIOCTLCMD;
1597 }
1598}
1599#endif
1600
1601static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
1602{
1603 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1604 struct net *net = dev_net(dev);
1605 struct mr_table *mrt;
1606 struct vif_device *v;
1607 int ct;
1608
1609 if (event != NETDEV_UNREGISTER)
1610 return NOTIFY_DONE;
1611
1612 ipmr_for_each_table(mrt, net) {
1613 v = &mrt->vif_table[0];
1614 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1615 if (v->dev == dev)
1616 vif_delete(mrt, ct, 1, NULL);
1617 }
1618 }
1619 return NOTIFY_DONE;
1620}
1621
1622static struct notifier_block ip_mr_notifier = {
1623 .notifier_call = ipmr_device_event,
1624};
1625
1626/* Encapsulate a packet by attaching a valid IPIP header to it.
1627 * This avoids tunnel drivers and other mess and gives us the speed so
1628 * important for multicast video.
1629 */
1630static void ip_encap(struct net *net, struct sk_buff *skb,
1631 __be32 saddr, __be32 daddr)
1632{
1633 struct iphdr *iph;
1634 const struct iphdr *old_iph = ip_hdr(skb);
1635
1636 skb_push(skb, sizeof(struct iphdr));
1637 skb->transport_header = skb->network_header;
1638 skb_reset_network_header(skb);
1639 iph = ip_hdr(skb);
1640
1641 iph->version = 4;
1642 iph->tos = old_iph->tos;
1643 iph->ttl = old_iph->ttl;
1644 iph->frag_off = 0;
1645 iph->daddr = daddr;
1646 iph->saddr = saddr;
1647 iph->protocol = IPPROTO_IPIP;
1648 iph->ihl = 5;
1649 iph->tot_len = htons(skb->len);
1650 ip_select_ident(net, skb, NULL);
1651 ip_send_check(iph);
1652
1653 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1654 nf_reset(skb);
1655}
1656
1657static inline int ipmr_forward_finish(struct net *net, struct sock *sk,
1658 struct sk_buff *skb)
1659{
1660 struct ip_options *opt = &(IPCB(skb)->opt);
1661
1662 IP_INC_STATS(net, IPSTATS_MIB_OUTFORWDATAGRAMS);
1663 IP_ADD_STATS(net, IPSTATS_MIB_OUTOCTETS, skb->len);
1664
1665 if (unlikely(opt->optlen))
1666 ip_forward_options(skb);
1667
1668 return dst_output(net, sk, skb);
1669}
1670
1671/* Processing handlers for ipmr_forward */
1672
1673static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
1674 struct sk_buff *skb, struct mfc_cache *c, int vifi)
1675{
1676 const struct iphdr *iph = ip_hdr(skb);
1677 struct vif_device *vif = &mrt->vif_table[vifi];
1678 struct net_device *dev;
1679 struct rtable *rt;
1680 struct flowi4 fl4;
1681 int encap = 0;
1682
1683 if (!vif->dev)
1684 goto out_free;
1685
1686 if (vif->flags & VIFF_REGISTER) {
1687 vif->pkt_out++;
1688 vif->bytes_out += skb->len;
1689 vif->dev->stats.tx_bytes += skb->len;
1690 vif->dev->stats.tx_packets++;
1691 ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT);
1692 goto out_free;
1693 }
1694
1695 if (vif->flags & VIFF_TUNNEL) {
1696 rt = ip_route_output_ports(net, &fl4, NULL,
1697 vif->remote, vif->local,
1698 0, 0,
1699 IPPROTO_IPIP,
1700 RT_TOS(iph->tos), vif->link);
1701 if (IS_ERR(rt))
1702 goto out_free;
1703 encap = sizeof(struct iphdr);
1704 } else {
1705 rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0,
1706 0, 0,
1707 IPPROTO_IPIP,
1708 RT_TOS(iph->tos), vif->link);
1709 if (IS_ERR(rt))
1710 goto out_free;
1711 }
1712
1713 dev = rt->dst.dev;
1714
1715 if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) {
1716 /* Do not fragment multicasts. Alas, IPv4 does not
1717 * allow to send ICMP, so that packets will disappear
1718 * to blackhole.
1719 */
1720 IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS);
1721 ip_rt_put(rt);
1722 goto out_free;
1723 }
1724
1725 encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len;
1726
1727 if (skb_cow(skb, encap)) {
1728 ip_rt_put(rt);
1729 goto out_free;
1730 }
1731
1732 vif->pkt_out++;
1733 vif->bytes_out += skb->len;
1734
1735 skb_dst_drop(skb);
1736 skb_dst_set(skb, &rt->dst);
1737 ip_decrease_ttl(ip_hdr(skb));
1738
1739 /* FIXME: forward and output firewalls used to be called here.
1740 * What do we do with netfilter? -- RR
1741 */
1742 if (vif->flags & VIFF_TUNNEL) {
1743 ip_encap(net, skb, vif->local, vif->remote);
1744 /* FIXME: extra output firewall step used to be here. --RR */
1745 vif->dev->stats.tx_packets++;
1746 vif->dev->stats.tx_bytes += skb->len;
1747 }
1748
1749 IPCB(skb)->flags |= IPSKB_FORWARDED;
1750
1751 /* RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
1752 * not only before forwarding, but after forwarding on all output
1753 * interfaces. It is clear, if mrouter runs a multicasting
1754 * program, it should receive packets not depending to what interface
1755 * program is joined.
1756 * If we will not make it, the program will have to join on all
1757 * interfaces. On the other hand, multihoming host (or router, but
1758 * not mrouter) cannot join to more than one interface - it will
1759 * result in receiving multiple packets.
1760 */
1761 NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD,
1762 net, NULL, skb, skb->dev, dev,
1763 ipmr_forward_finish);
1764 return;
1765
1766out_free:
1767 kfree_skb(skb);
1768}
1769
1770static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev)
1771{
1772 int ct;
1773
1774 for (ct = mrt->maxvif-1; ct >= 0; ct--) {
1775 if (mrt->vif_table[ct].dev == dev)
1776 break;
1777 }
1778 return ct;
1779}
1780
1781/* "local" means that we should preserve one skb (for local delivery) */
1782static void ip_mr_forward(struct net *net, struct mr_table *mrt,
1783 struct sk_buff *skb, struct mfc_cache *cache,
1784 int local)
1785{
1786 int psend = -1;
1787 int vif, ct;
1788 int true_vifi = ipmr_find_vif(mrt, skb->dev);
1789
1790 vif = cache->mfc_parent;
1791 cache->mfc_un.res.pkt++;
1792 cache->mfc_un.res.bytes += skb->len;
1793
1794 if (cache->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) {
1795 struct mfc_cache *cache_proxy;
1796
1797 /* For an (*,G) entry, we only check that the incomming
1798 * interface is part of the static tree.
1799 */
1800 cache_proxy = ipmr_cache_find_any_parent(mrt, vif);
1801 if (cache_proxy &&
1802 cache_proxy->mfc_un.res.ttls[true_vifi] < 255)
1803 goto forward;
1804 }
1805
1806 /* Wrong interface: drop packet and (maybe) send PIM assert. */
1807 if (mrt->vif_table[vif].dev != skb->dev) {
1808 if (rt_is_output_route(skb_rtable(skb))) {
1809 /* It is our own packet, looped back.
1810 * Very complicated situation...
1811 *
1812 * The best workaround until routing daemons will be
1813 * fixed is not to redistribute packet, if it was
1814 * send through wrong interface. It means, that
1815 * multicast applications WILL NOT work for
1816 * (S,G), which have default multicast route pointing
1817 * to wrong oif. In any case, it is not a good
1818 * idea to use multicasting applications on router.
1819 */
1820 goto dont_forward;
1821 }
1822
1823 cache->mfc_un.res.wrong_if++;
1824
1825 if (true_vifi >= 0 && mrt->mroute_do_assert &&
1826 /* pimsm uses asserts, when switching from RPT to SPT,
1827 * so that we cannot check that packet arrived on an oif.
1828 * It is bad, but otherwise we would need to move pretty
1829 * large chunk of pimd to kernel. Ough... --ANK
1830 */
1831 (mrt->mroute_do_pim ||
1832 cache->mfc_un.res.ttls[true_vifi] < 255) &&
1833 time_after(jiffies,
1834 cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) {
1835 cache->mfc_un.res.last_assert = jiffies;
1836 ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF);
1837 }
1838 goto dont_forward;
1839 }
1840
1841forward:
1842 mrt->vif_table[vif].pkt_in++;
1843 mrt->vif_table[vif].bytes_in += skb->len;
1844
1845 /* Forward the frame */
1846 if (cache->mfc_origin == htonl(INADDR_ANY) &&
1847 cache->mfc_mcastgrp == htonl(INADDR_ANY)) {
1848 if (true_vifi >= 0 &&
1849 true_vifi != cache->mfc_parent &&
1850 ip_hdr(skb)->ttl >
1851 cache->mfc_un.res.ttls[cache->mfc_parent]) {
1852 /* It's an (*,*) entry and the packet is not coming from
1853 * the upstream: forward the packet to the upstream
1854 * only.
1855 */
1856 psend = cache->mfc_parent;
1857 goto last_forward;
1858 }
1859 goto dont_forward;
1860 }
1861 for (ct = cache->mfc_un.res.maxvif - 1;
1862 ct >= cache->mfc_un.res.minvif; ct--) {
1863 /* For (*,G) entry, don't forward to the incoming interface */
1864 if ((cache->mfc_origin != htonl(INADDR_ANY) ||
1865 ct != true_vifi) &&
1866 ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) {
1867 if (psend != -1) {
1868 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1869
1870 if (skb2)
1871 ipmr_queue_xmit(net, mrt, skb2, cache,
1872 psend);
1873 }
1874 psend = ct;
1875 }
1876 }
1877last_forward:
1878 if (psend != -1) {
1879 if (local) {
1880 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1881
1882 if (skb2)
1883 ipmr_queue_xmit(net, mrt, skb2, cache, psend);
1884 } else {
1885 ipmr_queue_xmit(net, mrt, skb, cache, psend);
1886 return;
1887 }
1888 }
1889
1890dont_forward:
1891 if (!local)
1892 kfree_skb(skb);
1893}
1894
1895static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb)
1896{
1897 struct rtable *rt = skb_rtable(skb);
1898 struct iphdr *iph = ip_hdr(skb);
1899 struct flowi4 fl4 = {
1900 .daddr = iph->daddr,
1901 .saddr = iph->saddr,
1902 .flowi4_tos = RT_TOS(iph->tos),
1903 .flowi4_oif = (rt_is_output_route(rt) ?
1904 skb->dev->ifindex : 0),
1905 .flowi4_iif = (rt_is_output_route(rt) ?
1906 LOOPBACK_IFINDEX :
1907 skb->dev->ifindex),
1908 .flowi4_mark = skb->mark,
1909 };
1910 struct mr_table *mrt;
1911 int err;
1912
1913 err = ipmr_fib_lookup(net, &fl4, &mrt);
1914 if (err)
1915 return ERR_PTR(err);
1916 return mrt;
1917}
1918
1919/* Multicast packets for forwarding arrive here
1920 * Called with rcu_read_lock();
1921 */
1922int ip_mr_input(struct sk_buff *skb)
1923{
1924 struct mfc_cache *cache;
1925 struct net *net = dev_net(skb->dev);
1926 int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL;
1927 struct mr_table *mrt;
1928
1929 /* Packet is looped back after forward, it should not be
1930 * forwarded second time, but still can be delivered locally.
1931 */
1932 if (IPCB(skb)->flags & IPSKB_FORWARDED)
1933 goto dont_forward;
1934
1935 mrt = ipmr_rt_fib_lookup(net, skb);
1936 if (IS_ERR(mrt)) {
1937 kfree_skb(skb);
1938 return PTR_ERR(mrt);
1939 }
1940 if (!local) {
1941 if (IPCB(skb)->opt.router_alert) {
1942 if (ip_call_ra_chain(skb))
1943 return 0;
1944 } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) {
1945 /* IGMPv1 (and broken IGMPv2 implementations sort of
1946 * Cisco IOS <= 11.2(8)) do not put router alert
1947 * option to IGMP packets destined to routable
1948 * groups. It is very bad, because it means
1949 * that we can forward NO IGMP messages.
1950 */
1951 struct sock *mroute_sk;
1952
1953 mroute_sk = rcu_dereference(mrt->mroute_sk);
1954 if (mroute_sk) {
1955 nf_reset(skb);
1956 raw_rcv(mroute_sk, skb);
1957 return 0;
1958 }
1959 }
1960 }
1961
1962 /* already under rcu_read_lock() */
1963 cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
1964 if (!cache) {
1965 int vif = ipmr_find_vif(mrt, skb->dev);
1966
1967 if (vif >= 0)
1968 cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr,
1969 vif);
1970 }
1971
1972 /* No usable cache entry */
1973 if (!cache) {
1974 int vif;
1975
1976 if (local) {
1977 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1978 ip_local_deliver(skb);
1979 if (!skb2)
1980 return -ENOBUFS;
1981 skb = skb2;
1982 }
1983
1984 read_lock(&mrt_lock);
1985 vif = ipmr_find_vif(mrt, skb->dev);
1986 if (vif >= 0) {
1987 int err2 = ipmr_cache_unresolved(mrt, vif, skb);
1988 read_unlock(&mrt_lock);
1989
1990 return err2;
1991 }
1992 read_unlock(&mrt_lock);
1993 kfree_skb(skb);
1994 return -ENODEV;
1995 }
1996
1997 read_lock(&mrt_lock);
1998 ip_mr_forward(net, mrt, skb, cache, local);
1999 read_unlock(&mrt_lock);
2000
2001 if (local)
2002 return ip_local_deliver(skb);
2003
2004 return 0;
2005
2006dont_forward:
2007 if (local)
2008 return ip_local_deliver(skb);
2009 kfree_skb(skb);
2010 return 0;
2011}
2012
2013#ifdef CONFIG_IP_PIMSM_V1
2014/* Handle IGMP messages of PIMv1 */
2015int pim_rcv_v1(struct sk_buff *skb)
2016{
2017 struct igmphdr *pim;
2018 struct net *net = dev_net(skb->dev);
2019 struct mr_table *mrt;
2020
2021 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
2022 goto drop;
2023
2024 pim = igmp_hdr(skb);
2025
2026 mrt = ipmr_rt_fib_lookup(net, skb);
2027 if (IS_ERR(mrt))
2028 goto drop;
2029 if (!mrt->mroute_do_pim ||
2030 pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER)
2031 goto drop;
2032
2033 if (__pim_rcv(mrt, skb, sizeof(*pim))) {
2034drop:
2035 kfree_skb(skb);
2036 }
2037 return 0;
2038}
2039#endif
2040
2041#ifdef CONFIG_IP_PIMSM_V2
2042static int pim_rcv(struct sk_buff *skb)
2043{
2044 struct pimreghdr *pim;
2045 struct net *net = dev_net(skb->dev);
2046 struct mr_table *mrt;
2047
2048 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
2049 goto drop;
2050
2051 pim = (struct pimreghdr *)skb_transport_header(skb);
2052 if (pim->type != ((PIM_VERSION << 4) | (PIM_REGISTER)) ||
2053 (pim->flags & PIM_NULL_REGISTER) ||
2054 (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 &&
2055 csum_fold(skb_checksum(skb, 0, skb->len, 0))))
2056 goto drop;
2057
2058 mrt = ipmr_rt_fib_lookup(net, skb);
2059 if (IS_ERR(mrt))
2060 goto drop;
2061 if (__pim_rcv(mrt, skb, sizeof(*pim))) {
2062drop:
2063 kfree_skb(skb);
2064 }
2065 return 0;
2066}
2067#endif
2068
2069static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2070 struct mfc_cache *c, struct rtmsg *rtm)
2071{
2072 int ct;
2073 struct rtnexthop *nhp;
2074 struct nlattr *mp_attr;
2075 struct rta_mfc_stats mfcs;
2076
2077 /* If cache is unresolved, don't try to parse IIF and OIF */
2078 if (c->mfc_parent >= MAXVIFS)
2079 return -ENOENT;
2080
2081 if (VIF_EXISTS(mrt, c->mfc_parent) &&
2082 nla_put_u32(skb, RTA_IIF, mrt->vif_table[c->mfc_parent].dev->ifindex) < 0)
2083 return -EMSGSIZE;
2084
2085 if (!(mp_attr = nla_nest_start(skb, RTA_MULTIPATH)))
2086 return -EMSGSIZE;
2087
2088 for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
2089 if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {
2090 if (!(nhp = nla_reserve_nohdr(skb, sizeof(*nhp)))) {
2091 nla_nest_cancel(skb, mp_attr);
2092 return -EMSGSIZE;
2093 }
2094
2095 nhp->rtnh_flags = 0;
2096 nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
2097 nhp->rtnh_ifindex = mrt->vif_table[ct].dev->ifindex;
2098 nhp->rtnh_len = sizeof(*nhp);
2099 }
2100 }
2101
2102 nla_nest_end(skb, mp_attr);
2103
2104 mfcs.mfcs_packets = c->mfc_un.res.pkt;
2105 mfcs.mfcs_bytes = c->mfc_un.res.bytes;
2106 mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if;
2107 if (nla_put(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs) < 0)
2108 return -EMSGSIZE;
2109
2110 rtm->rtm_type = RTN_MULTICAST;
2111 return 1;
2112}
2113
2114int ipmr_get_route(struct net *net, struct sk_buff *skb,
2115 __be32 saddr, __be32 daddr,
2116 struct rtmsg *rtm, int nowait)
2117{
2118 struct mfc_cache *cache;
2119 struct mr_table *mrt;
2120 int err;
2121
2122 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2123 if (!mrt)
2124 return -ENOENT;
2125
2126 rcu_read_lock();
2127 cache = ipmr_cache_find(mrt, saddr, daddr);
2128 if (!cache && skb->dev) {
2129 int vif = ipmr_find_vif(mrt, skb->dev);
2130
2131 if (vif >= 0)
2132 cache = ipmr_cache_find_any(mrt, daddr, vif);
2133 }
2134 if (!cache) {
2135 struct sk_buff *skb2;
2136 struct iphdr *iph;
2137 struct net_device *dev;
2138 int vif = -1;
2139
2140 if (nowait) {
2141 rcu_read_unlock();
2142 return -EAGAIN;
2143 }
2144
2145 dev = skb->dev;
2146 read_lock(&mrt_lock);
2147 if (dev)
2148 vif = ipmr_find_vif(mrt, dev);
2149 if (vif < 0) {
2150 read_unlock(&mrt_lock);
2151 rcu_read_unlock();
2152 return -ENODEV;
2153 }
2154 skb2 = skb_clone(skb, GFP_ATOMIC);
2155 if (!skb2) {
2156 read_unlock(&mrt_lock);
2157 rcu_read_unlock();
2158 return -ENOMEM;
2159 }
2160
2161 skb_push(skb2, sizeof(struct iphdr));
2162 skb_reset_network_header(skb2);
2163 iph = ip_hdr(skb2);
2164 iph->ihl = sizeof(struct iphdr) >> 2;
2165 iph->saddr = saddr;
2166 iph->daddr = daddr;
2167 iph->version = 0;
2168 err = ipmr_cache_unresolved(mrt, vif, skb2);
2169 read_unlock(&mrt_lock);
2170 rcu_read_unlock();
2171 return err;
2172 }
2173
2174 read_lock(&mrt_lock);
2175 err = __ipmr_fill_mroute(mrt, skb, cache, rtm);
2176 read_unlock(&mrt_lock);
2177 rcu_read_unlock();
2178 return err;
2179}
2180
2181static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2182 u32 portid, u32 seq, struct mfc_cache *c, int cmd,
2183 int flags)
2184{
2185 struct nlmsghdr *nlh;
2186 struct rtmsg *rtm;
2187 int err;
2188
2189 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
2190 if (!nlh)
2191 return -EMSGSIZE;
2192
2193 rtm = nlmsg_data(nlh);
2194 rtm->rtm_family = RTNL_FAMILY_IPMR;
2195 rtm->rtm_dst_len = 32;
2196 rtm->rtm_src_len = 32;
2197 rtm->rtm_tos = 0;
2198 rtm->rtm_table = mrt->id;
2199 if (nla_put_u32(skb, RTA_TABLE, mrt->id))
2200 goto nla_put_failure;
2201 rtm->rtm_type = RTN_MULTICAST;
2202 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2203 if (c->mfc_flags & MFC_STATIC)
2204 rtm->rtm_protocol = RTPROT_STATIC;
2205 else
2206 rtm->rtm_protocol = RTPROT_MROUTED;
2207 rtm->rtm_flags = 0;
2208
2209 if (nla_put_in_addr(skb, RTA_SRC, c->mfc_origin) ||
2210 nla_put_in_addr(skb, RTA_DST, c->mfc_mcastgrp))
2211 goto nla_put_failure;
2212 err = __ipmr_fill_mroute(mrt, skb, c, rtm);
2213 /* do not break the dump if cache is unresolved */
2214 if (err < 0 && err != -ENOENT)
2215 goto nla_put_failure;
2216
2217 nlmsg_end(skb, nlh);
2218 return 0;
2219
2220nla_put_failure:
2221 nlmsg_cancel(skb, nlh);
2222 return -EMSGSIZE;
2223}
2224
2225static size_t mroute_msgsize(bool unresolved, int maxvif)
2226{
2227 size_t len =
2228 NLMSG_ALIGN(sizeof(struct rtmsg))
2229 + nla_total_size(4) /* RTA_TABLE */
2230 + nla_total_size(4) /* RTA_SRC */
2231 + nla_total_size(4) /* RTA_DST */
2232 ;
2233
2234 if (!unresolved)
2235 len = len
2236 + nla_total_size(4) /* RTA_IIF */
2237 + nla_total_size(0) /* RTA_MULTIPATH */
2238 + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
2239 /* RTA_MFC_STATS */
2240 + nla_total_size(sizeof(struct rta_mfc_stats))
2241 ;
2242
2243 return len;
2244}
2245
2246static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
2247 int cmd)
2248{
2249 struct net *net = read_pnet(&mrt->net);
2250 struct sk_buff *skb;
2251 int err = -ENOBUFS;
2252
2253 skb = nlmsg_new(mroute_msgsize(mfc->mfc_parent >= MAXVIFS, mrt->maxvif),
2254 GFP_ATOMIC);
2255 if (!skb)
2256 goto errout;
2257
2258 err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
2259 if (err < 0)
2260 goto errout;
2261
2262 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE, NULL, GFP_ATOMIC);
2263 return;
2264
2265errout:
2266 kfree_skb(skb);
2267 if (err < 0)
2268 rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE, err);
2269}
2270
2271static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2272{
2273 struct net *net = sock_net(skb->sk);
2274 struct mr_table *mrt;
2275 struct mfc_cache *mfc;
2276 unsigned int t = 0, s_t;
2277 unsigned int h = 0, s_h;
2278 unsigned int e = 0, s_e;
2279
2280 s_t = cb->args[0];
2281 s_h = cb->args[1];
2282 s_e = cb->args[2];
2283
2284 rcu_read_lock();
2285 ipmr_for_each_table(mrt, net) {
2286 if (t < s_t)
2287 goto next_table;
2288 if (t > s_t)
2289 s_h = 0;
2290 for (h = s_h; h < MFC_LINES; h++) {
2291 list_for_each_entry_rcu(mfc, &mrt->mfc_cache_array[h], list) {
2292 if (e < s_e)
2293 goto next_entry;
2294 if (ipmr_fill_mroute(mrt, skb,
2295 NETLINK_CB(cb->skb).portid,
2296 cb->nlh->nlmsg_seq,
2297 mfc, RTM_NEWROUTE,
2298 NLM_F_MULTI) < 0)
2299 goto done;
2300next_entry:
2301 e++;
2302 }
2303 e = s_e = 0;
2304 }
2305 spin_lock_bh(&mfc_unres_lock);
2306 list_for_each_entry(mfc, &mrt->mfc_unres_queue, list) {
2307 if (e < s_e)
2308 goto next_entry2;
2309 if (ipmr_fill_mroute(mrt, skb,
2310 NETLINK_CB(cb->skb).portid,
2311 cb->nlh->nlmsg_seq,
2312 mfc, RTM_NEWROUTE,
2313 NLM_F_MULTI) < 0) {
2314 spin_unlock_bh(&mfc_unres_lock);
2315 goto done;
2316 }
2317next_entry2:
2318 e++;
2319 }
2320 spin_unlock_bh(&mfc_unres_lock);
2321 e = s_e = 0;
2322 s_h = 0;
2323next_table:
2324 t++;
2325 }
2326done:
2327 rcu_read_unlock();
2328
2329 cb->args[2] = e;
2330 cb->args[1] = h;
2331 cb->args[0] = t;
2332
2333 return skb->len;
2334}
2335
2336static const struct nla_policy rtm_ipmr_policy[RTA_MAX + 1] = {
2337 [RTA_SRC] = { .type = NLA_U32 },
2338 [RTA_DST] = { .type = NLA_U32 },
2339 [RTA_IIF] = { .type = NLA_U32 },
2340 [RTA_TABLE] = { .type = NLA_U32 },
2341 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2342};
2343
2344static bool ipmr_rtm_validate_proto(unsigned char rtm_protocol)
2345{
2346 switch (rtm_protocol) {
2347 case RTPROT_STATIC:
2348 case RTPROT_MROUTED:
2349 return true;
2350 }
2351 return false;
2352}
2353
2354static int ipmr_nla_get_ttls(const struct nlattr *nla, struct mfcctl *mfcc)
2355{
2356 struct rtnexthop *rtnh = nla_data(nla);
2357 int remaining = nla_len(nla), vifi = 0;
2358
2359 while (rtnh_ok(rtnh, remaining)) {
2360 mfcc->mfcc_ttls[vifi] = rtnh->rtnh_hops;
2361 if (++vifi == MAXVIFS)
2362 break;
2363 rtnh = rtnh_next(rtnh, &remaining);
2364 }
2365
2366 return remaining > 0 ? -EINVAL : vifi;
2367}
2368
2369/* returns < 0 on error, 0 for ADD_MFC and 1 for ADD_MFC_PROXY */
2370static int rtm_to_ipmr_mfcc(struct net *net, struct nlmsghdr *nlh,
2371 struct mfcctl *mfcc, int *mrtsock,
2372 struct mr_table **mrtret)
2373{
2374 struct net_device *dev = NULL;
2375 u32 tblid = RT_TABLE_DEFAULT;
2376 struct mr_table *mrt;
2377 struct nlattr *attr;
2378 struct rtmsg *rtm;
2379 int ret, rem;
2380
2381 ret = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipmr_policy);
2382 if (ret < 0)
2383 goto out;
2384 rtm = nlmsg_data(nlh);
2385
2386 ret = -EINVAL;
2387 if (rtm->rtm_family != RTNL_FAMILY_IPMR || rtm->rtm_dst_len != 32 ||
2388 rtm->rtm_type != RTN_MULTICAST ||
2389 rtm->rtm_scope != RT_SCOPE_UNIVERSE ||
2390 !ipmr_rtm_validate_proto(rtm->rtm_protocol))
2391 goto out;
2392
2393 memset(mfcc, 0, sizeof(*mfcc));
2394 mfcc->mfcc_parent = -1;
2395 ret = 0;
2396 nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), rem) {
2397 switch (nla_type(attr)) {
2398 case RTA_SRC:
2399 mfcc->mfcc_origin.s_addr = nla_get_be32(attr);
2400 break;
2401 case RTA_DST:
2402 mfcc->mfcc_mcastgrp.s_addr = nla_get_be32(attr);
2403 break;
2404 case RTA_IIF:
2405 dev = __dev_get_by_index(net, nla_get_u32(attr));
2406 if (!dev) {
2407 ret = -ENODEV;
2408 goto out;
2409 }
2410 break;
2411 case RTA_MULTIPATH:
2412 if (ipmr_nla_get_ttls(attr, mfcc) < 0) {
2413 ret = -EINVAL;
2414 goto out;
2415 }
2416 break;
2417 case RTA_PREFSRC:
2418 ret = 1;
2419 break;
2420 case RTA_TABLE:
2421 tblid = nla_get_u32(attr);
2422 break;
2423 }
2424 }
2425 mrt = ipmr_get_table(net, tblid);
2426 if (!mrt) {
2427 ret = -ENOENT;
2428 goto out;
2429 }
2430 *mrtret = mrt;
2431 *mrtsock = rtm->rtm_protocol == RTPROT_MROUTED ? 1 : 0;
2432 if (dev)
2433 mfcc->mfcc_parent = ipmr_find_vif(mrt, dev);
2434
2435out:
2436 return ret;
2437}
2438
2439/* takes care of both newroute and delroute */
2440static int ipmr_rtm_route(struct sk_buff *skb, struct nlmsghdr *nlh)
2441{
2442 struct net *net = sock_net(skb->sk);
2443 int ret, mrtsock, parent;
2444 struct mr_table *tbl;
2445 struct mfcctl mfcc;
2446
2447 mrtsock = 0;
2448 tbl = NULL;
2449 ret = rtm_to_ipmr_mfcc(net, nlh, &mfcc, &mrtsock, &tbl);
2450 if (ret < 0)
2451 return ret;
2452
2453 parent = ret ? mfcc.mfcc_parent : -1;
2454 if (nlh->nlmsg_type == RTM_NEWROUTE)
2455 return ipmr_mfc_add(net, tbl, &mfcc, mrtsock, parent);
2456 else
2457 return ipmr_mfc_delete(tbl, &mfcc, parent);
2458}
2459
2460#ifdef CONFIG_PROC_FS
2461/* The /proc interfaces to multicast routing :
2462 * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif
2463 */
2464struct ipmr_vif_iter {
2465 struct seq_net_private p;
2466 struct mr_table *mrt;
2467 int ct;
2468};
2469
2470static struct vif_device *ipmr_vif_seq_idx(struct net *net,
2471 struct ipmr_vif_iter *iter,
2472 loff_t pos)
2473{
2474 struct mr_table *mrt = iter->mrt;
2475
2476 for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) {
2477 if (!VIF_EXISTS(mrt, iter->ct))
2478 continue;
2479 if (pos-- == 0)
2480 return &mrt->vif_table[iter->ct];
2481 }
2482 return NULL;
2483}
2484
2485static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos)
2486 __acquires(mrt_lock)
2487{
2488 struct ipmr_vif_iter *iter = seq->private;
2489 struct net *net = seq_file_net(seq);
2490 struct mr_table *mrt;
2491
2492 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2493 if (!mrt)
2494 return ERR_PTR(-ENOENT);
2495
2496 iter->mrt = mrt;
2497
2498 read_lock(&mrt_lock);
2499 return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1)
2500 : SEQ_START_TOKEN;
2501}
2502
2503static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2504{
2505 struct ipmr_vif_iter *iter = seq->private;
2506 struct net *net = seq_file_net(seq);
2507 struct mr_table *mrt = iter->mrt;
2508
2509 ++*pos;
2510 if (v == SEQ_START_TOKEN)
2511 return ipmr_vif_seq_idx(net, iter, 0);
2512
2513 while (++iter->ct < mrt->maxvif) {
2514 if (!VIF_EXISTS(mrt, iter->ct))
2515 continue;
2516 return &mrt->vif_table[iter->ct];
2517 }
2518 return NULL;
2519}
2520
2521static void ipmr_vif_seq_stop(struct seq_file *seq, void *v)
2522 __releases(mrt_lock)
2523{
2524 read_unlock(&mrt_lock);
2525}
2526
2527static int ipmr_vif_seq_show(struct seq_file *seq, void *v)
2528{
2529 struct ipmr_vif_iter *iter = seq->private;
2530 struct mr_table *mrt = iter->mrt;
2531
2532 if (v == SEQ_START_TOKEN) {
2533 seq_puts(seq,
2534 "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n");
2535 } else {
2536 const struct vif_device *vif = v;
2537 const char *name = vif->dev ? vif->dev->name : "none";
2538
2539 seq_printf(seq,
2540 "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n",
2541 vif - mrt->vif_table,
2542 name, vif->bytes_in, vif->pkt_in,
2543 vif->bytes_out, vif->pkt_out,
2544 vif->flags, vif->local, vif->remote);
2545 }
2546 return 0;
2547}
2548
2549static const struct seq_operations ipmr_vif_seq_ops = {
2550 .start = ipmr_vif_seq_start,
2551 .next = ipmr_vif_seq_next,
2552 .stop = ipmr_vif_seq_stop,
2553 .show = ipmr_vif_seq_show,
2554};
2555
2556static int ipmr_vif_open(struct inode *inode, struct file *file)
2557{
2558 return seq_open_net(inode, file, &ipmr_vif_seq_ops,
2559 sizeof(struct ipmr_vif_iter));
2560}
2561
2562static const struct file_operations ipmr_vif_fops = {
2563 .owner = THIS_MODULE,
2564 .open = ipmr_vif_open,
2565 .read = seq_read,
2566 .llseek = seq_lseek,
2567 .release = seq_release_net,
2568};
2569
2570struct ipmr_mfc_iter {
2571 struct seq_net_private p;
2572 struct mr_table *mrt;
2573 struct list_head *cache;
2574 int ct;
2575};
2576
2577
2578static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net,
2579 struct ipmr_mfc_iter *it, loff_t pos)
2580{
2581 struct mr_table *mrt = it->mrt;
2582 struct mfc_cache *mfc;
2583
2584 rcu_read_lock();
2585 for (it->ct = 0; it->ct < MFC_LINES; it->ct++) {
2586 it->cache = &mrt->mfc_cache_array[it->ct];
2587 list_for_each_entry_rcu(mfc, it->cache, list)
2588 if (pos-- == 0)
2589 return mfc;
2590 }
2591 rcu_read_unlock();
2592
2593 spin_lock_bh(&mfc_unres_lock);
2594 it->cache = &mrt->mfc_unres_queue;
2595 list_for_each_entry(mfc, it->cache, list)
2596 if (pos-- == 0)
2597 return mfc;
2598 spin_unlock_bh(&mfc_unres_lock);
2599
2600 it->cache = NULL;
2601 return NULL;
2602}
2603
2604
2605static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
2606{
2607 struct ipmr_mfc_iter *it = seq->private;
2608 struct net *net = seq_file_net(seq);
2609 struct mr_table *mrt;
2610
2611 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2612 if (!mrt)
2613 return ERR_PTR(-ENOENT);
2614
2615 it->mrt = mrt;
2616 it->cache = NULL;
2617 it->ct = 0;
2618 return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1)
2619 : SEQ_START_TOKEN;
2620}
2621
2622static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2623{
2624 struct mfc_cache *mfc = v;
2625 struct ipmr_mfc_iter *it = seq->private;
2626 struct net *net = seq_file_net(seq);
2627 struct mr_table *mrt = it->mrt;
2628
2629 ++*pos;
2630
2631 if (v == SEQ_START_TOKEN)
2632 return ipmr_mfc_seq_idx(net, seq->private, 0);
2633
2634 if (mfc->list.next != it->cache)
2635 return list_entry(mfc->list.next, struct mfc_cache, list);
2636
2637 if (it->cache == &mrt->mfc_unres_queue)
2638 goto end_of_list;
2639
2640 BUG_ON(it->cache != &mrt->mfc_cache_array[it->ct]);
2641
2642 while (++it->ct < MFC_LINES) {
2643 it->cache = &mrt->mfc_cache_array[it->ct];
2644 if (list_empty(it->cache))
2645 continue;
2646 return list_first_entry(it->cache, struct mfc_cache, list);
2647 }
2648
2649 /* exhausted cache_array, show unresolved */
2650 rcu_read_unlock();
2651 it->cache = &mrt->mfc_unres_queue;
2652 it->ct = 0;
2653
2654 spin_lock_bh(&mfc_unres_lock);
2655 if (!list_empty(it->cache))
2656 return list_first_entry(it->cache, struct mfc_cache, list);
2657
2658end_of_list:
2659 spin_unlock_bh(&mfc_unres_lock);
2660 it->cache = NULL;
2661
2662 return NULL;
2663}
2664
2665static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v)
2666{
2667 struct ipmr_mfc_iter *it = seq->private;
2668 struct mr_table *mrt = it->mrt;
2669
2670 if (it->cache == &mrt->mfc_unres_queue)
2671 spin_unlock_bh(&mfc_unres_lock);
2672 else if (it->cache == &mrt->mfc_cache_array[it->ct])
2673 rcu_read_unlock();
2674}
2675
2676static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
2677{
2678 int n;
2679
2680 if (v == SEQ_START_TOKEN) {
2681 seq_puts(seq,
2682 "Group Origin Iif Pkts Bytes Wrong Oifs\n");
2683 } else {
2684 const struct mfc_cache *mfc = v;
2685 const struct ipmr_mfc_iter *it = seq->private;
2686 const struct mr_table *mrt = it->mrt;
2687
2688 seq_printf(seq, "%08X %08X %-3hd",
2689 (__force u32) mfc->mfc_mcastgrp,
2690 (__force u32) mfc->mfc_origin,
2691 mfc->mfc_parent);
2692
2693 if (it->cache != &mrt->mfc_unres_queue) {
2694 seq_printf(seq, " %8lu %8lu %8lu",
2695 mfc->mfc_un.res.pkt,
2696 mfc->mfc_un.res.bytes,
2697 mfc->mfc_un.res.wrong_if);
2698 for (n = mfc->mfc_un.res.minvif;
2699 n < mfc->mfc_un.res.maxvif; n++) {
2700 if (VIF_EXISTS(mrt, n) &&
2701 mfc->mfc_un.res.ttls[n] < 255)
2702 seq_printf(seq,
2703 " %2d:%-3d",
2704 n, mfc->mfc_un.res.ttls[n]);
2705 }
2706 } else {
2707 /* unresolved mfc_caches don't contain
2708 * pkt, bytes and wrong_if values
2709 */
2710 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
2711 }
2712 seq_putc(seq, '\n');
2713 }
2714 return 0;
2715}
2716
2717static const struct seq_operations ipmr_mfc_seq_ops = {
2718 .start = ipmr_mfc_seq_start,
2719 .next = ipmr_mfc_seq_next,
2720 .stop = ipmr_mfc_seq_stop,
2721 .show = ipmr_mfc_seq_show,
2722};
2723
2724static int ipmr_mfc_open(struct inode *inode, struct file *file)
2725{
2726 return seq_open_net(inode, file, &ipmr_mfc_seq_ops,
2727 sizeof(struct ipmr_mfc_iter));
2728}
2729
2730static const struct file_operations ipmr_mfc_fops = {
2731 .owner = THIS_MODULE,
2732 .open = ipmr_mfc_open,
2733 .read = seq_read,
2734 .llseek = seq_lseek,
2735 .release = seq_release_net,
2736};
2737#endif
2738
2739#ifdef CONFIG_IP_PIMSM_V2
2740static const struct net_protocol pim_protocol = {
2741 .handler = pim_rcv,
2742 .netns_ok = 1,
2743};
2744#endif
2745
2746/* Setup for IP multicast routing */
2747static int __net_init ipmr_net_init(struct net *net)
2748{
2749 int err;
2750
2751 err = ipmr_rules_init(net);
2752 if (err < 0)
2753 goto fail;
2754
2755#ifdef CONFIG_PROC_FS
2756 err = -ENOMEM;
2757 if (!proc_create("ip_mr_vif", 0, net->proc_net, &ipmr_vif_fops))
2758 goto proc_vif_fail;
2759 if (!proc_create("ip_mr_cache", 0, net->proc_net, &ipmr_mfc_fops))
2760 goto proc_cache_fail;
2761#endif
2762 return 0;
2763
2764#ifdef CONFIG_PROC_FS
2765proc_cache_fail:
2766 remove_proc_entry("ip_mr_vif", net->proc_net);
2767proc_vif_fail:
2768 ipmr_rules_exit(net);
2769#endif
2770fail:
2771 return err;
2772}
2773
2774static void __net_exit ipmr_net_exit(struct net *net)
2775{
2776#ifdef CONFIG_PROC_FS
2777 remove_proc_entry("ip_mr_cache", net->proc_net);
2778 remove_proc_entry("ip_mr_vif", net->proc_net);
2779#endif
2780 ipmr_rules_exit(net);
2781}
2782
2783static struct pernet_operations ipmr_net_ops = {
2784 .init = ipmr_net_init,
2785 .exit = ipmr_net_exit,
2786};
2787
2788int __init ip_mr_init(void)
2789{
2790 int err;
2791
2792 mrt_cachep = kmem_cache_create("ip_mrt_cache",
2793 sizeof(struct mfc_cache),
2794 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC,
2795 NULL);
2796
2797 err = register_pernet_subsys(&ipmr_net_ops);
2798 if (err)
2799 goto reg_pernet_fail;
2800
2801 err = register_netdevice_notifier(&ip_mr_notifier);
2802 if (err)
2803 goto reg_notif_fail;
2804#ifdef CONFIG_IP_PIMSM_V2
2805 if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) {
2806 pr_err("%s: can't add PIM protocol\n", __func__);
2807 err = -EAGAIN;
2808 goto add_proto_fail;
2809 }
2810#endif
2811 rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE,
2812 NULL, ipmr_rtm_dumproute, NULL);
2813 rtnl_register(RTNL_FAMILY_IPMR, RTM_NEWROUTE,
2814 ipmr_rtm_route, NULL, NULL);
2815 rtnl_register(RTNL_FAMILY_IPMR, RTM_DELROUTE,
2816 ipmr_rtm_route, NULL, NULL);
2817 return 0;
2818
2819#ifdef CONFIG_IP_PIMSM_V2
2820add_proto_fail:
2821 unregister_netdevice_notifier(&ip_mr_notifier);
2822#endif
2823reg_notif_fail:
2824 unregister_pernet_subsys(&ipmr_net_ops);
2825reg_pernet_fail:
2826 kmem_cache_destroy(mrt_cachep);
2827 return err;
2828}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * IP multicast routing support for mrouted 3.6/3.8
4 *
5 * (c) 1995 Alan Cox, <alan@lxorguk.ukuu.org.uk>
6 * Linux Consultancy and Custom Driver Development
7 *
8 * Fixes:
9 * Michael Chastain : Incorrect size of copying.
10 * Alan Cox : Added the cache manager code
11 * Alan Cox : Fixed the clone/copy bug and device race.
12 * Mike McLagan : Routing by source
13 * Malcolm Beattie : Buffer handling fixes.
14 * Alexey Kuznetsov : Double buffer free and other fixes.
15 * SVR Anand : Fixed several multicast bugs and problems.
16 * Alexey Kuznetsov : Status, optimisations and more.
17 * Brad Parker : Better behaviour on mrouted upcall
18 * overflow.
19 * Carlos Picoto : PIMv1 Support
20 * Pavlin Ivanov Radoslavov: PIMv2 Registers must checksum only PIM header
21 * Relax this requirement to work with older peers.
22 */
23
24#include <linux/uaccess.h>
25#include <linux/types.h>
26#include <linux/cache.h>
27#include <linux/capability.h>
28#include <linux/errno.h>
29#include <linux/mm.h>
30#include <linux/kernel.h>
31#include <linux/fcntl.h>
32#include <linux/stat.h>
33#include <linux/socket.h>
34#include <linux/in.h>
35#include <linux/inet.h>
36#include <linux/netdevice.h>
37#include <linux/inetdevice.h>
38#include <linux/igmp.h>
39#include <linux/proc_fs.h>
40#include <linux/seq_file.h>
41#include <linux/mroute.h>
42#include <linux/init.h>
43#include <linux/if_ether.h>
44#include <linux/slab.h>
45#include <net/net_namespace.h>
46#include <net/ip.h>
47#include <net/protocol.h>
48#include <linux/skbuff.h>
49#include <net/route.h>
50#include <net/icmp.h>
51#include <net/udp.h>
52#include <net/raw.h>
53#include <linux/notifier.h>
54#include <linux/if_arp.h>
55#include <linux/netfilter_ipv4.h>
56#include <linux/compat.h>
57#include <linux/export.h>
58#include <linux/rhashtable.h>
59#include <net/ip_tunnels.h>
60#include <net/checksum.h>
61#include <net/netlink.h>
62#include <net/fib_rules.h>
63#include <linux/netconf.h>
64#include <net/rtnh.h>
65
66#include <linux/nospec.h>
67
68struct ipmr_rule {
69 struct fib_rule common;
70};
71
72struct ipmr_result {
73 struct mr_table *mrt;
74};
75
76/* Big lock, protecting vif table, mrt cache and mroute socket state.
77 * Note that the changes are semaphored via rtnl_lock.
78 */
79
80static DEFINE_SPINLOCK(mrt_lock);
81
82static struct net_device *vif_dev_read(const struct vif_device *vif)
83{
84 return rcu_dereference(vif->dev);
85}
86
87/* Multicast router control variables */
88
89/* Special spinlock for queue of unresolved entries */
90static DEFINE_SPINLOCK(mfc_unres_lock);
91
92/* We return to original Alan's scheme. Hash table of resolved
93 * entries is changed only in process context and protected
94 * with weak lock mrt_lock. Queue of unresolved entries is protected
95 * with strong spinlock mfc_unres_lock.
96 *
97 * In this case data path is free of exclusive locks at all.
98 */
99
100static struct kmem_cache *mrt_cachep __ro_after_init;
101
102static struct mr_table *ipmr_new_table(struct net *net, u32 id);
103static void ipmr_free_table(struct mr_table *mrt);
104
105static void ip_mr_forward(struct net *net, struct mr_table *mrt,
106 struct net_device *dev, struct sk_buff *skb,
107 struct mfc_cache *cache, int local);
108static int ipmr_cache_report(const struct mr_table *mrt,
109 struct sk_buff *pkt, vifi_t vifi, int assert);
110static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
111 int cmd);
112static void igmpmsg_netlink_event(const struct mr_table *mrt, struct sk_buff *pkt);
113static void mroute_clean_tables(struct mr_table *mrt, int flags);
114static void ipmr_expire_process(struct timer_list *t);
115
116#ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
117#define ipmr_for_each_table(mrt, net) \
118 list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list, \
119 lockdep_rtnl_is_held() || \
120 list_empty(&net->ipv4.mr_tables))
121
122static struct mr_table *ipmr_mr_table_iter(struct net *net,
123 struct mr_table *mrt)
124{
125 struct mr_table *ret;
126
127 if (!mrt)
128 ret = list_entry_rcu(net->ipv4.mr_tables.next,
129 struct mr_table, list);
130 else
131 ret = list_entry_rcu(mrt->list.next,
132 struct mr_table, list);
133
134 if (&ret->list == &net->ipv4.mr_tables)
135 return NULL;
136 return ret;
137}
138
139static struct mr_table *ipmr_get_table(struct net *net, u32 id)
140{
141 struct mr_table *mrt;
142
143 ipmr_for_each_table(mrt, net) {
144 if (mrt->id == id)
145 return mrt;
146 }
147 return NULL;
148}
149
150static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4,
151 struct mr_table **mrt)
152{
153 int err;
154 struct ipmr_result res;
155 struct fib_lookup_arg arg = {
156 .result = &res,
157 .flags = FIB_LOOKUP_NOREF,
158 };
159
160 /* update flow if oif or iif point to device enslaved to l3mdev */
161 l3mdev_update_flow(net, flowi4_to_flowi(flp4));
162
163 err = fib_rules_lookup(net->ipv4.mr_rules_ops,
164 flowi4_to_flowi(flp4), 0, &arg);
165 if (err < 0)
166 return err;
167 *mrt = res.mrt;
168 return 0;
169}
170
171static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp,
172 int flags, struct fib_lookup_arg *arg)
173{
174 struct ipmr_result *res = arg->result;
175 struct mr_table *mrt;
176
177 switch (rule->action) {
178 case FR_ACT_TO_TBL:
179 break;
180 case FR_ACT_UNREACHABLE:
181 return -ENETUNREACH;
182 case FR_ACT_PROHIBIT:
183 return -EACCES;
184 case FR_ACT_BLACKHOLE:
185 default:
186 return -EINVAL;
187 }
188
189 arg->table = fib_rule_get_table(rule, arg);
190
191 mrt = ipmr_get_table(rule->fr_net, arg->table);
192 if (!mrt)
193 return -EAGAIN;
194 res->mrt = mrt;
195 return 0;
196}
197
198static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
199{
200 return 1;
201}
202
203static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
204 struct fib_rule_hdr *frh, struct nlattr **tb,
205 struct netlink_ext_ack *extack)
206{
207 return 0;
208}
209
210static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
211 struct nlattr **tb)
212{
213 return 1;
214}
215
216static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
217 struct fib_rule_hdr *frh)
218{
219 frh->dst_len = 0;
220 frh->src_len = 0;
221 frh->tos = 0;
222 return 0;
223}
224
225static const struct fib_rules_ops __net_initconst ipmr_rules_ops_template = {
226 .family = RTNL_FAMILY_IPMR,
227 .rule_size = sizeof(struct ipmr_rule),
228 .addr_size = sizeof(u32),
229 .action = ipmr_rule_action,
230 .match = ipmr_rule_match,
231 .configure = ipmr_rule_configure,
232 .compare = ipmr_rule_compare,
233 .fill = ipmr_rule_fill,
234 .nlgroup = RTNLGRP_IPV4_RULE,
235 .owner = THIS_MODULE,
236};
237
238static int __net_init ipmr_rules_init(struct net *net)
239{
240 struct fib_rules_ops *ops;
241 struct mr_table *mrt;
242 int err;
243
244 ops = fib_rules_register(&ipmr_rules_ops_template, net);
245 if (IS_ERR(ops))
246 return PTR_ERR(ops);
247
248 INIT_LIST_HEAD(&net->ipv4.mr_tables);
249
250 mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
251 if (IS_ERR(mrt)) {
252 err = PTR_ERR(mrt);
253 goto err1;
254 }
255
256 err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0);
257 if (err < 0)
258 goto err2;
259
260 net->ipv4.mr_rules_ops = ops;
261 return 0;
262
263err2:
264 rtnl_lock();
265 ipmr_free_table(mrt);
266 rtnl_unlock();
267err1:
268 fib_rules_unregister(ops);
269 return err;
270}
271
272static void __net_exit ipmr_rules_exit(struct net *net)
273{
274 struct mr_table *mrt, *next;
275
276 ASSERT_RTNL();
277 list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) {
278 list_del(&mrt->list);
279 ipmr_free_table(mrt);
280 }
281 fib_rules_unregister(net->ipv4.mr_rules_ops);
282}
283
284static int ipmr_rules_dump(struct net *net, struct notifier_block *nb,
285 struct netlink_ext_ack *extack)
286{
287 return fib_rules_dump(net, nb, RTNL_FAMILY_IPMR, extack);
288}
289
290static unsigned int ipmr_rules_seq_read(struct net *net)
291{
292 return fib_rules_seq_read(net, RTNL_FAMILY_IPMR);
293}
294
295bool ipmr_rule_default(const struct fib_rule *rule)
296{
297 return fib_rule_matchall(rule) && rule->table == RT_TABLE_DEFAULT;
298}
299EXPORT_SYMBOL(ipmr_rule_default);
300#else
301#define ipmr_for_each_table(mrt, net) \
302 for (mrt = net->ipv4.mrt; mrt; mrt = NULL)
303
304static struct mr_table *ipmr_mr_table_iter(struct net *net,
305 struct mr_table *mrt)
306{
307 if (!mrt)
308 return net->ipv4.mrt;
309 return NULL;
310}
311
312static struct mr_table *ipmr_get_table(struct net *net, u32 id)
313{
314 return net->ipv4.mrt;
315}
316
317static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4,
318 struct mr_table **mrt)
319{
320 *mrt = net->ipv4.mrt;
321 return 0;
322}
323
324static int __net_init ipmr_rules_init(struct net *net)
325{
326 struct mr_table *mrt;
327
328 mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
329 if (IS_ERR(mrt))
330 return PTR_ERR(mrt);
331 net->ipv4.mrt = mrt;
332 return 0;
333}
334
335static void __net_exit ipmr_rules_exit(struct net *net)
336{
337 ASSERT_RTNL();
338 ipmr_free_table(net->ipv4.mrt);
339 net->ipv4.mrt = NULL;
340}
341
342static int ipmr_rules_dump(struct net *net, struct notifier_block *nb,
343 struct netlink_ext_ack *extack)
344{
345 return 0;
346}
347
348static unsigned int ipmr_rules_seq_read(struct net *net)
349{
350 return 0;
351}
352
353bool ipmr_rule_default(const struct fib_rule *rule)
354{
355 return true;
356}
357EXPORT_SYMBOL(ipmr_rule_default);
358#endif
359
360static inline int ipmr_hash_cmp(struct rhashtable_compare_arg *arg,
361 const void *ptr)
362{
363 const struct mfc_cache_cmp_arg *cmparg = arg->key;
364 const struct mfc_cache *c = ptr;
365
366 return cmparg->mfc_mcastgrp != c->mfc_mcastgrp ||
367 cmparg->mfc_origin != c->mfc_origin;
368}
369
370static const struct rhashtable_params ipmr_rht_params = {
371 .head_offset = offsetof(struct mr_mfc, mnode),
372 .key_offset = offsetof(struct mfc_cache, cmparg),
373 .key_len = sizeof(struct mfc_cache_cmp_arg),
374 .nelem_hint = 3,
375 .obj_cmpfn = ipmr_hash_cmp,
376 .automatic_shrinking = true,
377};
378
379static void ipmr_new_table_set(struct mr_table *mrt,
380 struct net *net)
381{
382#ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
383 list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables);
384#endif
385}
386
387static struct mfc_cache_cmp_arg ipmr_mr_table_ops_cmparg_any = {
388 .mfc_mcastgrp = htonl(INADDR_ANY),
389 .mfc_origin = htonl(INADDR_ANY),
390};
391
392static struct mr_table_ops ipmr_mr_table_ops = {
393 .rht_params = &ipmr_rht_params,
394 .cmparg_any = &ipmr_mr_table_ops_cmparg_any,
395};
396
397static struct mr_table *ipmr_new_table(struct net *net, u32 id)
398{
399 struct mr_table *mrt;
400
401 /* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */
402 if (id != RT_TABLE_DEFAULT && id >= 1000000000)
403 return ERR_PTR(-EINVAL);
404
405 mrt = ipmr_get_table(net, id);
406 if (mrt)
407 return mrt;
408
409 return mr_table_alloc(net, id, &ipmr_mr_table_ops,
410 ipmr_expire_process, ipmr_new_table_set);
411}
412
413static void ipmr_free_table(struct mr_table *mrt)
414{
415 timer_shutdown_sync(&mrt->ipmr_expire_timer);
416 mroute_clean_tables(mrt, MRT_FLUSH_VIFS | MRT_FLUSH_VIFS_STATIC |
417 MRT_FLUSH_MFC | MRT_FLUSH_MFC_STATIC);
418 rhltable_destroy(&mrt->mfc_hash);
419 kfree(mrt);
420}
421
422/* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */
423
424/* Initialize ipmr pimreg/tunnel in_device */
425static bool ipmr_init_vif_indev(const struct net_device *dev)
426{
427 struct in_device *in_dev;
428
429 ASSERT_RTNL();
430
431 in_dev = __in_dev_get_rtnl(dev);
432 if (!in_dev)
433 return false;
434 ipv4_devconf_setall(in_dev);
435 neigh_parms_data_state_setall(in_dev->arp_parms);
436 IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;
437
438 return true;
439}
440
441static struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v)
442{
443 struct net_device *tunnel_dev, *new_dev;
444 struct ip_tunnel_parm p = { };
445 int err;
446
447 tunnel_dev = __dev_get_by_name(net, "tunl0");
448 if (!tunnel_dev)
449 goto out;
450
451 p.iph.daddr = v->vifc_rmt_addr.s_addr;
452 p.iph.saddr = v->vifc_lcl_addr.s_addr;
453 p.iph.version = 4;
454 p.iph.ihl = 5;
455 p.iph.protocol = IPPROTO_IPIP;
456 sprintf(p.name, "dvmrp%d", v->vifc_vifi);
457
458 if (!tunnel_dev->netdev_ops->ndo_tunnel_ctl)
459 goto out;
460 err = tunnel_dev->netdev_ops->ndo_tunnel_ctl(tunnel_dev, &p,
461 SIOCADDTUNNEL);
462 if (err)
463 goto out;
464
465 new_dev = __dev_get_by_name(net, p.name);
466 if (!new_dev)
467 goto out;
468
469 new_dev->flags |= IFF_MULTICAST;
470 if (!ipmr_init_vif_indev(new_dev))
471 goto out_unregister;
472 if (dev_open(new_dev, NULL))
473 goto out_unregister;
474 dev_hold(new_dev);
475 err = dev_set_allmulti(new_dev, 1);
476 if (err) {
477 dev_close(new_dev);
478 tunnel_dev->netdev_ops->ndo_tunnel_ctl(tunnel_dev, &p,
479 SIOCDELTUNNEL);
480 dev_put(new_dev);
481 new_dev = ERR_PTR(err);
482 }
483 return new_dev;
484
485out_unregister:
486 unregister_netdevice(new_dev);
487out:
488 return ERR_PTR(-ENOBUFS);
489}
490
491#if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2)
492static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev)
493{
494 struct net *net = dev_net(dev);
495 struct mr_table *mrt;
496 struct flowi4 fl4 = {
497 .flowi4_oif = dev->ifindex,
498 .flowi4_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
499 .flowi4_mark = skb->mark,
500 };
501 int err;
502
503 err = ipmr_fib_lookup(net, &fl4, &mrt);
504 if (err < 0) {
505 kfree_skb(skb);
506 return err;
507 }
508
509 DEV_STATS_ADD(dev, tx_bytes, skb->len);
510 DEV_STATS_INC(dev, tx_packets);
511 rcu_read_lock();
512
513 /* Pairs with WRITE_ONCE() in vif_add() and vif_delete() */
514 ipmr_cache_report(mrt, skb, READ_ONCE(mrt->mroute_reg_vif_num),
515 IGMPMSG_WHOLEPKT);
516
517 rcu_read_unlock();
518 kfree_skb(skb);
519 return NETDEV_TX_OK;
520}
521
522static int reg_vif_get_iflink(const struct net_device *dev)
523{
524 return 0;
525}
526
527static const struct net_device_ops reg_vif_netdev_ops = {
528 .ndo_start_xmit = reg_vif_xmit,
529 .ndo_get_iflink = reg_vif_get_iflink,
530};
531
532static void reg_vif_setup(struct net_device *dev)
533{
534 dev->type = ARPHRD_PIMREG;
535 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8;
536 dev->flags = IFF_NOARP;
537 dev->netdev_ops = ®_vif_netdev_ops;
538 dev->needs_free_netdev = true;
539 dev->features |= NETIF_F_NETNS_LOCAL;
540}
541
542static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
543{
544 struct net_device *dev;
545 char name[IFNAMSIZ];
546
547 if (mrt->id == RT_TABLE_DEFAULT)
548 sprintf(name, "pimreg");
549 else
550 sprintf(name, "pimreg%u", mrt->id);
551
552 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup);
553
554 if (!dev)
555 return NULL;
556
557 dev_net_set(dev, net);
558
559 if (register_netdevice(dev)) {
560 free_netdev(dev);
561 return NULL;
562 }
563
564 if (!ipmr_init_vif_indev(dev))
565 goto failure;
566 if (dev_open(dev, NULL))
567 goto failure;
568
569 dev_hold(dev);
570
571 return dev;
572
573failure:
574 unregister_netdevice(dev);
575 return NULL;
576}
577
578/* called with rcu_read_lock() */
579static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb,
580 unsigned int pimlen)
581{
582 struct net_device *reg_dev = NULL;
583 struct iphdr *encap;
584 int vif_num;
585
586 encap = (struct iphdr *)(skb_transport_header(skb) + pimlen);
587 /* Check that:
588 * a. packet is really sent to a multicast group
589 * b. packet is not a NULL-REGISTER
590 * c. packet is not truncated
591 */
592 if (!ipv4_is_multicast(encap->daddr) ||
593 encap->tot_len == 0 ||
594 ntohs(encap->tot_len) + pimlen > skb->len)
595 return 1;
596
597 /* Pairs with WRITE_ONCE() in vif_add()/vid_delete() */
598 vif_num = READ_ONCE(mrt->mroute_reg_vif_num);
599 if (vif_num >= 0)
600 reg_dev = vif_dev_read(&mrt->vif_table[vif_num]);
601 if (!reg_dev)
602 return 1;
603
604 skb->mac_header = skb->network_header;
605 skb_pull(skb, (u8 *)encap - skb->data);
606 skb_reset_network_header(skb);
607 skb->protocol = htons(ETH_P_IP);
608 skb->ip_summed = CHECKSUM_NONE;
609
610 skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
611
612 netif_rx(skb);
613
614 return NET_RX_SUCCESS;
615}
616#else
617static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
618{
619 return NULL;
620}
621#endif
622
623static int call_ipmr_vif_entry_notifiers(struct net *net,
624 enum fib_event_type event_type,
625 struct vif_device *vif,
626 struct net_device *vif_dev,
627 vifi_t vif_index, u32 tb_id)
628{
629 return mr_call_vif_notifiers(net, RTNL_FAMILY_IPMR, event_type,
630 vif, vif_dev, vif_index, tb_id,
631 &net->ipv4.ipmr_seq);
632}
633
634static int call_ipmr_mfc_entry_notifiers(struct net *net,
635 enum fib_event_type event_type,
636 struct mfc_cache *mfc, u32 tb_id)
637{
638 return mr_call_mfc_notifiers(net, RTNL_FAMILY_IPMR, event_type,
639 &mfc->_c, tb_id, &net->ipv4.ipmr_seq);
640}
641
642/**
643 * vif_delete - Delete a VIF entry
644 * @mrt: Table to delete from
645 * @vifi: VIF identifier to delete
646 * @notify: Set to 1, if the caller is a notifier_call
647 * @head: if unregistering the VIF, place it on this queue
648 */
649static int vif_delete(struct mr_table *mrt, int vifi, int notify,
650 struct list_head *head)
651{
652 struct net *net = read_pnet(&mrt->net);
653 struct vif_device *v;
654 struct net_device *dev;
655 struct in_device *in_dev;
656
657 if (vifi < 0 || vifi >= mrt->maxvif)
658 return -EADDRNOTAVAIL;
659
660 v = &mrt->vif_table[vifi];
661
662 dev = rtnl_dereference(v->dev);
663 if (!dev)
664 return -EADDRNOTAVAIL;
665
666 spin_lock(&mrt_lock);
667 call_ipmr_vif_entry_notifiers(net, FIB_EVENT_VIF_DEL, v, dev,
668 vifi, mrt->id);
669 RCU_INIT_POINTER(v->dev, NULL);
670
671 if (vifi == mrt->mroute_reg_vif_num) {
672 /* Pairs with READ_ONCE() in ipmr_cache_report() and reg_vif_xmit() */
673 WRITE_ONCE(mrt->mroute_reg_vif_num, -1);
674 }
675 if (vifi + 1 == mrt->maxvif) {
676 int tmp;
677
678 for (tmp = vifi - 1; tmp >= 0; tmp--) {
679 if (VIF_EXISTS(mrt, tmp))
680 break;
681 }
682 WRITE_ONCE(mrt->maxvif, tmp + 1);
683 }
684
685 spin_unlock(&mrt_lock);
686
687 dev_set_allmulti(dev, -1);
688
689 in_dev = __in_dev_get_rtnl(dev);
690 if (in_dev) {
691 IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--;
692 inet_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
693 NETCONFA_MC_FORWARDING,
694 dev->ifindex, &in_dev->cnf);
695 ip_rt_multicast_event(in_dev);
696 }
697
698 if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify)
699 unregister_netdevice_queue(dev, head);
700
701 netdev_put(dev, &v->dev_tracker);
702 return 0;
703}
704
705static void ipmr_cache_free_rcu(struct rcu_head *head)
706{
707 struct mr_mfc *c = container_of(head, struct mr_mfc, rcu);
708
709 kmem_cache_free(mrt_cachep, (struct mfc_cache *)c);
710}
711
712static void ipmr_cache_free(struct mfc_cache *c)
713{
714 call_rcu(&c->_c.rcu, ipmr_cache_free_rcu);
715}
716
717/* Destroy an unresolved cache entry, killing queued skbs
718 * and reporting error to netlink readers.
719 */
720static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c)
721{
722 struct net *net = read_pnet(&mrt->net);
723 struct sk_buff *skb;
724 struct nlmsgerr *e;
725
726 atomic_dec(&mrt->cache_resolve_queue_len);
727
728 while ((skb = skb_dequeue(&c->_c.mfc_un.unres.unresolved))) {
729 if (ip_hdr(skb)->version == 0) {
730 struct nlmsghdr *nlh = skb_pull(skb,
731 sizeof(struct iphdr));
732 nlh->nlmsg_type = NLMSG_ERROR;
733 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
734 skb_trim(skb, nlh->nlmsg_len);
735 e = nlmsg_data(nlh);
736 e->error = -ETIMEDOUT;
737 memset(&e->msg, 0, sizeof(e->msg));
738
739 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
740 } else {
741 kfree_skb(skb);
742 }
743 }
744
745 ipmr_cache_free(c);
746}
747
748/* Timer process for the unresolved queue. */
749static void ipmr_expire_process(struct timer_list *t)
750{
751 struct mr_table *mrt = from_timer(mrt, t, ipmr_expire_timer);
752 struct mr_mfc *c, *next;
753 unsigned long expires;
754 unsigned long now;
755
756 if (!spin_trylock(&mfc_unres_lock)) {
757 mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10);
758 return;
759 }
760
761 if (list_empty(&mrt->mfc_unres_queue))
762 goto out;
763
764 now = jiffies;
765 expires = 10*HZ;
766
767 list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
768 if (time_after(c->mfc_un.unres.expires, now)) {
769 unsigned long interval = c->mfc_un.unres.expires - now;
770 if (interval < expires)
771 expires = interval;
772 continue;
773 }
774
775 list_del(&c->list);
776 mroute_netlink_event(mrt, (struct mfc_cache *)c, RTM_DELROUTE);
777 ipmr_destroy_unres(mrt, (struct mfc_cache *)c);
778 }
779
780 if (!list_empty(&mrt->mfc_unres_queue))
781 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
782
783out:
784 spin_unlock(&mfc_unres_lock);
785}
786
787/* Fill oifs list. It is called under locked mrt_lock. */
788static void ipmr_update_thresholds(struct mr_table *mrt, struct mr_mfc *cache,
789 unsigned char *ttls)
790{
791 int vifi;
792
793 cache->mfc_un.res.minvif = MAXVIFS;
794 cache->mfc_un.res.maxvif = 0;
795 memset(cache->mfc_un.res.ttls, 255, MAXVIFS);
796
797 for (vifi = 0; vifi < mrt->maxvif; vifi++) {
798 if (VIF_EXISTS(mrt, vifi) &&
799 ttls[vifi] && ttls[vifi] < 255) {
800 cache->mfc_un.res.ttls[vifi] = ttls[vifi];
801 if (cache->mfc_un.res.minvif > vifi)
802 cache->mfc_un.res.minvif = vifi;
803 if (cache->mfc_un.res.maxvif <= vifi)
804 cache->mfc_un.res.maxvif = vifi + 1;
805 }
806 }
807 cache->mfc_un.res.lastuse = jiffies;
808}
809
810static int vif_add(struct net *net, struct mr_table *mrt,
811 struct vifctl *vifc, int mrtsock)
812{
813 struct netdev_phys_item_id ppid = { };
814 int vifi = vifc->vifc_vifi;
815 struct vif_device *v = &mrt->vif_table[vifi];
816 struct net_device *dev;
817 struct in_device *in_dev;
818 int err;
819
820 /* Is vif busy ? */
821 if (VIF_EXISTS(mrt, vifi))
822 return -EADDRINUSE;
823
824 switch (vifc->vifc_flags) {
825 case VIFF_REGISTER:
826 if (!ipmr_pimsm_enabled())
827 return -EINVAL;
828 /* Special Purpose VIF in PIM
829 * All the packets will be sent to the daemon
830 */
831 if (mrt->mroute_reg_vif_num >= 0)
832 return -EADDRINUSE;
833 dev = ipmr_reg_vif(net, mrt);
834 if (!dev)
835 return -ENOBUFS;
836 err = dev_set_allmulti(dev, 1);
837 if (err) {
838 unregister_netdevice(dev);
839 dev_put(dev);
840 return err;
841 }
842 break;
843 case VIFF_TUNNEL:
844 dev = ipmr_new_tunnel(net, vifc);
845 if (IS_ERR(dev))
846 return PTR_ERR(dev);
847 break;
848 case VIFF_USE_IFINDEX:
849 case 0:
850 if (vifc->vifc_flags == VIFF_USE_IFINDEX) {
851 dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex);
852 if (dev && !__in_dev_get_rtnl(dev)) {
853 dev_put(dev);
854 return -EADDRNOTAVAIL;
855 }
856 } else {
857 dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr);
858 }
859 if (!dev)
860 return -EADDRNOTAVAIL;
861 err = dev_set_allmulti(dev, 1);
862 if (err) {
863 dev_put(dev);
864 return err;
865 }
866 break;
867 default:
868 return -EINVAL;
869 }
870
871 in_dev = __in_dev_get_rtnl(dev);
872 if (!in_dev) {
873 dev_put(dev);
874 return -EADDRNOTAVAIL;
875 }
876 IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++;
877 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_MC_FORWARDING,
878 dev->ifindex, &in_dev->cnf);
879 ip_rt_multicast_event(in_dev);
880
881 /* Fill in the VIF structures */
882 vif_device_init(v, dev, vifc->vifc_rate_limit,
883 vifc->vifc_threshold,
884 vifc->vifc_flags | (!mrtsock ? VIFF_STATIC : 0),
885 (VIFF_TUNNEL | VIFF_REGISTER));
886
887 err = dev_get_port_parent_id(dev, &ppid, true);
888 if (err == 0) {
889 memcpy(v->dev_parent_id.id, ppid.id, ppid.id_len);
890 v->dev_parent_id.id_len = ppid.id_len;
891 } else {
892 v->dev_parent_id.id_len = 0;
893 }
894
895 v->local = vifc->vifc_lcl_addr.s_addr;
896 v->remote = vifc->vifc_rmt_addr.s_addr;
897
898 /* And finish update writing critical data */
899 spin_lock(&mrt_lock);
900 rcu_assign_pointer(v->dev, dev);
901 netdev_tracker_alloc(dev, &v->dev_tracker, GFP_ATOMIC);
902 if (v->flags & VIFF_REGISTER) {
903 /* Pairs with READ_ONCE() in ipmr_cache_report() and reg_vif_xmit() */
904 WRITE_ONCE(mrt->mroute_reg_vif_num, vifi);
905 }
906 if (vifi+1 > mrt->maxvif)
907 WRITE_ONCE(mrt->maxvif, vifi + 1);
908 spin_unlock(&mrt_lock);
909 call_ipmr_vif_entry_notifiers(net, FIB_EVENT_VIF_ADD, v, dev,
910 vifi, mrt->id);
911 return 0;
912}
913
914/* called with rcu_read_lock() */
915static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt,
916 __be32 origin,
917 __be32 mcastgrp)
918{
919 struct mfc_cache_cmp_arg arg = {
920 .mfc_mcastgrp = mcastgrp,
921 .mfc_origin = origin
922 };
923
924 return mr_mfc_find(mrt, &arg);
925}
926
927/* Look for a (*,G) entry */
928static struct mfc_cache *ipmr_cache_find_any(struct mr_table *mrt,
929 __be32 mcastgrp, int vifi)
930{
931 struct mfc_cache_cmp_arg arg = {
932 .mfc_mcastgrp = mcastgrp,
933 .mfc_origin = htonl(INADDR_ANY)
934 };
935
936 if (mcastgrp == htonl(INADDR_ANY))
937 return mr_mfc_find_any_parent(mrt, vifi);
938 return mr_mfc_find_any(mrt, vifi, &arg);
939}
940
941/* Look for a (S,G,iif) entry if parent != -1 */
942static struct mfc_cache *ipmr_cache_find_parent(struct mr_table *mrt,
943 __be32 origin, __be32 mcastgrp,
944 int parent)
945{
946 struct mfc_cache_cmp_arg arg = {
947 .mfc_mcastgrp = mcastgrp,
948 .mfc_origin = origin,
949 };
950
951 return mr_mfc_find_parent(mrt, &arg, parent);
952}
953
954/* Allocate a multicast cache entry */
955static struct mfc_cache *ipmr_cache_alloc(void)
956{
957 struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
958
959 if (c) {
960 c->_c.mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1;
961 c->_c.mfc_un.res.minvif = MAXVIFS;
962 c->_c.free = ipmr_cache_free_rcu;
963 refcount_set(&c->_c.mfc_un.res.refcount, 1);
964 }
965 return c;
966}
967
968static struct mfc_cache *ipmr_cache_alloc_unres(void)
969{
970 struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
971
972 if (c) {
973 skb_queue_head_init(&c->_c.mfc_un.unres.unresolved);
974 c->_c.mfc_un.unres.expires = jiffies + 10 * HZ;
975 }
976 return c;
977}
978
979/* A cache entry has gone into a resolved state from queued */
980static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt,
981 struct mfc_cache *uc, struct mfc_cache *c)
982{
983 struct sk_buff *skb;
984 struct nlmsgerr *e;
985
986 /* Play the pending entries through our router */
987 while ((skb = __skb_dequeue(&uc->_c.mfc_un.unres.unresolved))) {
988 if (ip_hdr(skb)->version == 0) {
989 struct nlmsghdr *nlh = skb_pull(skb,
990 sizeof(struct iphdr));
991
992 if (mr_fill_mroute(mrt, skb, &c->_c,
993 nlmsg_data(nlh)) > 0) {
994 nlh->nlmsg_len = skb_tail_pointer(skb) -
995 (u8 *)nlh;
996 } else {
997 nlh->nlmsg_type = NLMSG_ERROR;
998 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
999 skb_trim(skb, nlh->nlmsg_len);
1000 e = nlmsg_data(nlh);
1001 e->error = -EMSGSIZE;
1002 memset(&e->msg, 0, sizeof(e->msg));
1003 }
1004
1005 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
1006 } else {
1007 rcu_read_lock();
1008 ip_mr_forward(net, mrt, skb->dev, skb, c, 0);
1009 rcu_read_unlock();
1010 }
1011 }
1012}
1013
1014/* Bounce a cache query up to mrouted and netlink.
1015 *
1016 * Called under rcu_read_lock().
1017 */
1018static int ipmr_cache_report(const struct mr_table *mrt,
1019 struct sk_buff *pkt, vifi_t vifi, int assert)
1020{
1021 const int ihl = ip_hdrlen(pkt);
1022 struct sock *mroute_sk;
1023 struct igmphdr *igmp;
1024 struct igmpmsg *msg;
1025 struct sk_buff *skb;
1026 int ret;
1027
1028 if (assert == IGMPMSG_WHOLEPKT || assert == IGMPMSG_WRVIFWHOLE)
1029 skb = skb_realloc_headroom(pkt, sizeof(struct iphdr));
1030 else
1031 skb = alloc_skb(128, GFP_ATOMIC);
1032
1033 if (!skb)
1034 return -ENOBUFS;
1035
1036 if (assert == IGMPMSG_WHOLEPKT || assert == IGMPMSG_WRVIFWHOLE) {
1037 /* Ugly, but we have no choice with this interface.
1038 * Duplicate old header, fix ihl, length etc.
1039 * And all this only to mangle msg->im_msgtype and
1040 * to set msg->im_mbz to "mbz" :-)
1041 */
1042 skb_push(skb, sizeof(struct iphdr));
1043 skb_reset_network_header(skb);
1044 skb_reset_transport_header(skb);
1045 msg = (struct igmpmsg *)skb_network_header(skb);
1046 memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr));
1047 msg->im_msgtype = assert;
1048 msg->im_mbz = 0;
1049 if (assert == IGMPMSG_WRVIFWHOLE) {
1050 msg->im_vif = vifi;
1051 msg->im_vif_hi = vifi >> 8;
1052 } else {
1053 /* Pairs with WRITE_ONCE() in vif_add() and vif_delete() */
1054 int vif_num = READ_ONCE(mrt->mroute_reg_vif_num);
1055
1056 msg->im_vif = vif_num;
1057 msg->im_vif_hi = vif_num >> 8;
1058 }
1059 ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2;
1060 ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) +
1061 sizeof(struct iphdr));
1062 } else {
1063 /* Copy the IP header */
1064 skb_set_network_header(skb, skb->len);
1065 skb_put(skb, ihl);
1066 skb_copy_to_linear_data(skb, pkt->data, ihl);
1067 /* Flag to the kernel this is a route add */
1068 ip_hdr(skb)->protocol = 0;
1069 msg = (struct igmpmsg *)skb_network_header(skb);
1070 msg->im_vif = vifi;
1071 msg->im_vif_hi = vifi >> 8;
1072 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
1073 /* Add our header */
1074 igmp = skb_put(skb, sizeof(struct igmphdr));
1075 igmp->type = assert;
1076 msg->im_msgtype = assert;
1077 igmp->code = 0;
1078 ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */
1079 skb->transport_header = skb->network_header;
1080 }
1081
1082 mroute_sk = rcu_dereference(mrt->mroute_sk);
1083 if (!mroute_sk) {
1084 kfree_skb(skb);
1085 return -EINVAL;
1086 }
1087
1088 igmpmsg_netlink_event(mrt, skb);
1089
1090 /* Deliver to mrouted */
1091 ret = sock_queue_rcv_skb(mroute_sk, skb);
1092
1093 if (ret < 0) {
1094 net_warn_ratelimited("mroute: pending queue full, dropping entries\n");
1095 kfree_skb(skb);
1096 }
1097
1098 return ret;
1099}
1100
1101/* Queue a packet for resolution. It gets locked cache entry! */
1102/* Called under rcu_read_lock() */
1103static int ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi,
1104 struct sk_buff *skb, struct net_device *dev)
1105{
1106 const struct iphdr *iph = ip_hdr(skb);
1107 struct mfc_cache *c;
1108 bool found = false;
1109 int err;
1110
1111 spin_lock_bh(&mfc_unres_lock);
1112 list_for_each_entry(c, &mrt->mfc_unres_queue, _c.list) {
1113 if (c->mfc_mcastgrp == iph->daddr &&
1114 c->mfc_origin == iph->saddr) {
1115 found = true;
1116 break;
1117 }
1118 }
1119
1120 if (!found) {
1121 /* Create a new entry if allowable */
1122 c = ipmr_cache_alloc_unres();
1123 if (!c) {
1124 spin_unlock_bh(&mfc_unres_lock);
1125
1126 kfree_skb(skb);
1127 return -ENOBUFS;
1128 }
1129
1130 /* Fill in the new cache entry */
1131 c->_c.mfc_parent = -1;
1132 c->mfc_origin = iph->saddr;
1133 c->mfc_mcastgrp = iph->daddr;
1134
1135 /* Reflect first query at mrouted. */
1136 err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE);
1137
1138 if (err < 0) {
1139 /* If the report failed throw the cache entry
1140 out - Brad Parker
1141 */
1142 spin_unlock_bh(&mfc_unres_lock);
1143
1144 ipmr_cache_free(c);
1145 kfree_skb(skb);
1146 return err;
1147 }
1148
1149 atomic_inc(&mrt->cache_resolve_queue_len);
1150 list_add(&c->_c.list, &mrt->mfc_unres_queue);
1151 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1152
1153 if (atomic_read(&mrt->cache_resolve_queue_len) == 1)
1154 mod_timer(&mrt->ipmr_expire_timer,
1155 c->_c.mfc_un.unres.expires);
1156 }
1157
1158 /* See if we can append the packet */
1159 if (c->_c.mfc_un.unres.unresolved.qlen > 3) {
1160 kfree_skb(skb);
1161 err = -ENOBUFS;
1162 } else {
1163 if (dev) {
1164 skb->dev = dev;
1165 skb->skb_iif = dev->ifindex;
1166 }
1167 skb_queue_tail(&c->_c.mfc_un.unres.unresolved, skb);
1168 err = 0;
1169 }
1170
1171 spin_unlock_bh(&mfc_unres_lock);
1172 return err;
1173}
1174
1175/* MFC cache manipulation by user space mroute daemon */
1176
1177static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent)
1178{
1179 struct net *net = read_pnet(&mrt->net);
1180 struct mfc_cache *c;
1181
1182 /* The entries are added/deleted only under RTNL */
1183 rcu_read_lock();
1184 c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr,
1185 mfc->mfcc_mcastgrp.s_addr, parent);
1186 rcu_read_unlock();
1187 if (!c)
1188 return -ENOENT;
1189 rhltable_remove(&mrt->mfc_hash, &c->_c.mnode, ipmr_rht_params);
1190 list_del_rcu(&c->_c.list);
1191 call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, c, mrt->id);
1192 mroute_netlink_event(mrt, c, RTM_DELROUTE);
1193 mr_cache_put(&c->_c);
1194
1195 return 0;
1196}
1197
1198static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
1199 struct mfcctl *mfc, int mrtsock, int parent)
1200{
1201 struct mfc_cache *uc, *c;
1202 struct mr_mfc *_uc;
1203 bool found;
1204 int ret;
1205
1206 if (mfc->mfcc_parent >= MAXVIFS)
1207 return -ENFILE;
1208
1209 /* The entries are added/deleted only under RTNL */
1210 rcu_read_lock();
1211 c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr,
1212 mfc->mfcc_mcastgrp.s_addr, parent);
1213 rcu_read_unlock();
1214 if (c) {
1215 spin_lock(&mrt_lock);
1216 c->_c.mfc_parent = mfc->mfcc_parent;
1217 ipmr_update_thresholds(mrt, &c->_c, mfc->mfcc_ttls);
1218 if (!mrtsock)
1219 c->_c.mfc_flags |= MFC_STATIC;
1220 spin_unlock(&mrt_lock);
1221 call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE, c,
1222 mrt->id);
1223 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1224 return 0;
1225 }
1226
1227 if (mfc->mfcc_mcastgrp.s_addr != htonl(INADDR_ANY) &&
1228 !ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr))
1229 return -EINVAL;
1230
1231 c = ipmr_cache_alloc();
1232 if (!c)
1233 return -ENOMEM;
1234
1235 c->mfc_origin = mfc->mfcc_origin.s_addr;
1236 c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr;
1237 c->_c.mfc_parent = mfc->mfcc_parent;
1238 ipmr_update_thresholds(mrt, &c->_c, mfc->mfcc_ttls);
1239 if (!mrtsock)
1240 c->_c.mfc_flags |= MFC_STATIC;
1241
1242 ret = rhltable_insert_key(&mrt->mfc_hash, &c->cmparg, &c->_c.mnode,
1243 ipmr_rht_params);
1244 if (ret) {
1245 pr_err("ipmr: rhtable insert error %d\n", ret);
1246 ipmr_cache_free(c);
1247 return ret;
1248 }
1249 list_add_tail_rcu(&c->_c.list, &mrt->mfc_cache_list);
1250 /* Check to see if we resolved a queued list. If so we
1251 * need to send on the frames and tidy up.
1252 */
1253 found = false;
1254 spin_lock_bh(&mfc_unres_lock);
1255 list_for_each_entry(_uc, &mrt->mfc_unres_queue, list) {
1256 uc = (struct mfc_cache *)_uc;
1257 if (uc->mfc_origin == c->mfc_origin &&
1258 uc->mfc_mcastgrp == c->mfc_mcastgrp) {
1259 list_del(&_uc->list);
1260 atomic_dec(&mrt->cache_resolve_queue_len);
1261 found = true;
1262 break;
1263 }
1264 }
1265 if (list_empty(&mrt->mfc_unres_queue))
1266 del_timer(&mrt->ipmr_expire_timer);
1267 spin_unlock_bh(&mfc_unres_lock);
1268
1269 if (found) {
1270 ipmr_cache_resolve(net, mrt, uc, c);
1271 ipmr_cache_free(uc);
1272 }
1273 call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_ADD, c, mrt->id);
1274 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1275 return 0;
1276}
1277
1278/* Close the multicast socket, and clear the vif tables etc */
1279static void mroute_clean_tables(struct mr_table *mrt, int flags)
1280{
1281 struct net *net = read_pnet(&mrt->net);
1282 struct mr_mfc *c, *tmp;
1283 struct mfc_cache *cache;
1284 LIST_HEAD(list);
1285 int i;
1286
1287 /* Shut down all active vif entries */
1288 if (flags & (MRT_FLUSH_VIFS | MRT_FLUSH_VIFS_STATIC)) {
1289 for (i = 0; i < mrt->maxvif; i++) {
1290 if (((mrt->vif_table[i].flags & VIFF_STATIC) &&
1291 !(flags & MRT_FLUSH_VIFS_STATIC)) ||
1292 (!(mrt->vif_table[i].flags & VIFF_STATIC) && !(flags & MRT_FLUSH_VIFS)))
1293 continue;
1294 vif_delete(mrt, i, 0, &list);
1295 }
1296 unregister_netdevice_many(&list);
1297 }
1298
1299 /* Wipe the cache */
1300 if (flags & (MRT_FLUSH_MFC | MRT_FLUSH_MFC_STATIC)) {
1301 list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) {
1302 if (((c->mfc_flags & MFC_STATIC) && !(flags & MRT_FLUSH_MFC_STATIC)) ||
1303 (!(c->mfc_flags & MFC_STATIC) && !(flags & MRT_FLUSH_MFC)))
1304 continue;
1305 rhltable_remove(&mrt->mfc_hash, &c->mnode, ipmr_rht_params);
1306 list_del_rcu(&c->list);
1307 cache = (struct mfc_cache *)c;
1308 call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, cache,
1309 mrt->id);
1310 mroute_netlink_event(mrt, cache, RTM_DELROUTE);
1311 mr_cache_put(c);
1312 }
1313 }
1314
1315 if (flags & MRT_FLUSH_MFC) {
1316 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1317 spin_lock_bh(&mfc_unres_lock);
1318 list_for_each_entry_safe(c, tmp, &mrt->mfc_unres_queue, list) {
1319 list_del(&c->list);
1320 cache = (struct mfc_cache *)c;
1321 mroute_netlink_event(mrt, cache, RTM_DELROUTE);
1322 ipmr_destroy_unres(mrt, cache);
1323 }
1324 spin_unlock_bh(&mfc_unres_lock);
1325 }
1326 }
1327}
1328
1329/* called from ip_ra_control(), before an RCU grace period,
1330 * we don't need to call synchronize_rcu() here
1331 */
1332static void mrtsock_destruct(struct sock *sk)
1333{
1334 struct net *net = sock_net(sk);
1335 struct mr_table *mrt;
1336
1337 rtnl_lock();
1338 ipmr_for_each_table(mrt, net) {
1339 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1340 IPV4_DEVCONF_ALL(net, MC_FORWARDING)--;
1341 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
1342 NETCONFA_MC_FORWARDING,
1343 NETCONFA_IFINDEX_ALL,
1344 net->ipv4.devconf_all);
1345 RCU_INIT_POINTER(mrt->mroute_sk, NULL);
1346 mroute_clean_tables(mrt, MRT_FLUSH_VIFS | MRT_FLUSH_MFC);
1347 }
1348 }
1349 rtnl_unlock();
1350}
1351
1352/* Socket options and virtual interface manipulation. The whole
1353 * virtual interface system is a complete heap, but unfortunately
1354 * that's how BSD mrouted happens to think. Maybe one day with a proper
1355 * MOSPF/PIM router set up we can clean this up.
1356 */
1357
1358int ip_mroute_setsockopt(struct sock *sk, int optname, sockptr_t optval,
1359 unsigned int optlen)
1360{
1361 struct net *net = sock_net(sk);
1362 int val, ret = 0, parent = 0;
1363 struct mr_table *mrt;
1364 struct vifctl vif;
1365 struct mfcctl mfc;
1366 bool do_wrvifwhole;
1367 u32 uval;
1368
1369 /* There's one exception to the lock - MRT_DONE which needs to unlock */
1370 rtnl_lock();
1371 if (sk->sk_type != SOCK_RAW ||
1372 inet_sk(sk)->inet_num != IPPROTO_IGMP) {
1373 ret = -EOPNOTSUPP;
1374 goto out_unlock;
1375 }
1376
1377 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1378 if (!mrt) {
1379 ret = -ENOENT;
1380 goto out_unlock;
1381 }
1382 if (optname != MRT_INIT) {
1383 if (sk != rcu_access_pointer(mrt->mroute_sk) &&
1384 !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
1385 ret = -EACCES;
1386 goto out_unlock;
1387 }
1388 }
1389
1390 switch (optname) {
1391 case MRT_INIT:
1392 if (optlen != sizeof(int)) {
1393 ret = -EINVAL;
1394 break;
1395 }
1396 if (rtnl_dereference(mrt->mroute_sk)) {
1397 ret = -EADDRINUSE;
1398 break;
1399 }
1400
1401 ret = ip_ra_control(sk, 1, mrtsock_destruct);
1402 if (ret == 0) {
1403 rcu_assign_pointer(mrt->mroute_sk, sk);
1404 IPV4_DEVCONF_ALL(net, MC_FORWARDING)++;
1405 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
1406 NETCONFA_MC_FORWARDING,
1407 NETCONFA_IFINDEX_ALL,
1408 net->ipv4.devconf_all);
1409 }
1410 break;
1411 case MRT_DONE:
1412 if (sk != rcu_access_pointer(mrt->mroute_sk)) {
1413 ret = -EACCES;
1414 } else {
1415 /* We need to unlock here because mrtsock_destruct takes
1416 * care of rtnl itself and we can't change that due to
1417 * the IP_ROUTER_ALERT setsockopt which runs without it.
1418 */
1419 rtnl_unlock();
1420 ret = ip_ra_control(sk, 0, NULL);
1421 goto out;
1422 }
1423 break;
1424 case MRT_ADD_VIF:
1425 case MRT_DEL_VIF:
1426 if (optlen != sizeof(vif)) {
1427 ret = -EINVAL;
1428 break;
1429 }
1430 if (copy_from_sockptr(&vif, optval, sizeof(vif))) {
1431 ret = -EFAULT;
1432 break;
1433 }
1434 if (vif.vifc_vifi >= MAXVIFS) {
1435 ret = -ENFILE;
1436 break;
1437 }
1438 if (optname == MRT_ADD_VIF) {
1439 ret = vif_add(net, mrt, &vif,
1440 sk == rtnl_dereference(mrt->mroute_sk));
1441 } else {
1442 ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL);
1443 }
1444 break;
1445 /* Manipulate the forwarding caches. These live
1446 * in a sort of kernel/user symbiosis.
1447 */
1448 case MRT_ADD_MFC:
1449 case MRT_DEL_MFC:
1450 parent = -1;
1451 fallthrough;
1452 case MRT_ADD_MFC_PROXY:
1453 case MRT_DEL_MFC_PROXY:
1454 if (optlen != sizeof(mfc)) {
1455 ret = -EINVAL;
1456 break;
1457 }
1458 if (copy_from_sockptr(&mfc, optval, sizeof(mfc))) {
1459 ret = -EFAULT;
1460 break;
1461 }
1462 if (parent == 0)
1463 parent = mfc.mfcc_parent;
1464 if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY)
1465 ret = ipmr_mfc_delete(mrt, &mfc, parent);
1466 else
1467 ret = ipmr_mfc_add(net, mrt, &mfc,
1468 sk == rtnl_dereference(mrt->mroute_sk),
1469 parent);
1470 break;
1471 case MRT_FLUSH:
1472 if (optlen != sizeof(val)) {
1473 ret = -EINVAL;
1474 break;
1475 }
1476 if (copy_from_sockptr(&val, optval, sizeof(val))) {
1477 ret = -EFAULT;
1478 break;
1479 }
1480 mroute_clean_tables(mrt, val);
1481 break;
1482 /* Control PIM assert. */
1483 case MRT_ASSERT:
1484 if (optlen != sizeof(val)) {
1485 ret = -EINVAL;
1486 break;
1487 }
1488 if (copy_from_sockptr(&val, optval, sizeof(val))) {
1489 ret = -EFAULT;
1490 break;
1491 }
1492 mrt->mroute_do_assert = val;
1493 break;
1494 case MRT_PIM:
1495 if (!ipmr_pimsm_enabled()) {
1496 ret = -ENOPROTOOPT;
1497 break;
1498 }
1499 if (optlen != sizeof(val)) {
1500 ret = -EINVAL;
1501 break;
1502 }
1503 if (copy_from_sockptr(&val, optval, sizeof(val))) {
1504 ret = -EFAULT;
1505 break;
1506 }
1507
1508 do_wrvifwhole = (val == IGMPMSG_WRVIFWHOLE);
1509 val = !!val;
1510 if (val != mrt->mroute_do_pim) {
1511 mrt->mroute_do_pim = val;
1512 mrt->mroute_do_assert = val;
1513 mrt->mroute_do_wrvifwhole = do_wrvifwhole;
1514 }
1515 break;
1516 case MRT_TABLE:
1517 if (!IS_BUILTIN(CONFIG_IP_MROUTE_MULTIPLE_TABLES)) {
1518 ret = -ENOPROTOOPT;
1519 break;
1520 }
1521 if (optlen != sizeof(uval)) {
1522 ret = -EINVAL;
1523 break;
1524 }
1525 if (copy_from_sockptr(&uval, optval, sizeof(uval))) {
1526 ret = -EFAULT;
1527 break;
1528 }
1529
1530 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1531 ret = -EBUSY;
1532 } else {
1533 mrt = ipmr_new_table(net, uval);
1534 if (IS_ERR(mrt))
1535 ret = PTR_ERR(mrt);
1536 else
1537 raw_sk(sk)->ipmr_table = uval;
1538 }
1539 break;
1540 /* Spurious command, or MRT_VERSION which you cannot set. */
1541 default:
1542 ret = -ENOPROTOOPT;
1543 }
1544out_unlock:
1545 rtnl_unlock();
1546out:
1547 return ret;
1548}
1549
1550/* Getsock opt support for the multicast routing system. */
1551int ip_mroute_getsockopt(struct sock *sk, int optname, sockptr_t optval,
1552 sockptr_t optlen)
1553{
1554 int olr;
1555 int val;
1556 struct net *net = sock_net(sk);
1557 struct mr_table *mrt;
1558
1559 if (sk->sk_type != SOCK_RAW ||
1560 inet_sk(sk)->inet_num != IPPROTO_IGMP)
1561 return -EOPNOTSUPP;
1562
1563 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1564 if (!mrt)
1565 return -ENOENT;
1566
1567 switch (optname) {
1568 case MRT_VERSION:
1569 val = 0x0305;
1570 break;
1571 case MRT_PIM:
1572 if (!ipmr_pimsm_enabled())
1573 return -ENOPROTOOPT;
1574 val = mrt->mroute_do_pim;
1575 break;
1576 case MRT_ASSERT:
1577 val = mrt->mroute_do_assert;
1578 break;
1579 default:
1580 return -ENOPROTOOPT;
1581 }
1582
1583 if (copy_from_sockptr(&olr, optlen, sizeof(int)))
1584 return -EFAULT;
1585 olr = min_t(unsigned int, olr, sizeof(int));
1586 if (olr < 0)
1587 return -EINVAL;
1588 if (copy_to_sockptr(optlen, &olr, sizeof(int)))
1589 return -EFAULT;
1590 if (copy_to_sockptr(optval, &val, olr))
1591 return -EFAULT;
1592 return 0;
1593}
1594
1595/* The IP multicast ioctl support routines. */
1596int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg)
1597{
1598 struct sioc_sg_req sr;
1599 struct sioc_vif_req vr;
1600 struct vif_device *vif;
1601 struct mfc_cache *c;
1602 struct net *net = sock_net(sk);
1603 struct mr_table *mrt;
1604
1605 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1606 if (!mrt)
1607 return -ENOENT;
1608
1609 switch (cmd) {
1610 case SIOCGETVIFCNT:
1611 if (copy_from_user(&vr, arg, sizeof(vr)))
1612 return -EFAULT;
1613 if (vr.vifi >= mrt->maxvif)
1614 return -EINVAL;
1615 vr.vifi = array_index_nospec(vr.vifi, mrt->maxvif);
1616 rcu_read_lock();
1617 vif = &mrt->vif_table[vr.vifi];
1618 if (VIF_EXISTS(mrt, vr.vifi)) {
1619 vr.icount = READ_ONCE(vif->pkt_in);
1620 vr.ocount = READ_ONCE(vif->pkt_out);
1621 vr.ibytes = READ_ONCE(vif->bytes_in);
1622 vr.obytes = READ_ONCE(vif->bytes_out);
1623 rcu_read_unlock();
1624
1625 if (copy_to_user(arg, &vr, sizeof(vr)))
1626 return -EFAULT;
1627 return 0;
1628 }
1629 rcu_read_unlock();
1630 return -EADDRNOTAVAIL;
1631 case SIOCGETSGCNT:
1632 if (copy_from_user(&sr, arg, sizeof(sr)))
1633 return -EFAULT;
1634
1635 rcu_read_lock();
1636 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
1637 if (c) {
1638 sr.pktcnt = c->_c.mfc_un.res.pkt;
1639 sr.bytecnt = c->_c.mfc_un.res.bytes;
1640 sr.wrong_if = c->_c.mfc_un.res.wrong_if;
1641 rcu_read_unlock();
1642
1643 if (copy_to_user(arg, &sr, sizeof(sr)))
1644 return -EFAULT;
1645 return 0;
1646 }
1647 rcu_read_unlock();
1648 return -EADDRNOTAVAIL;
1649 default:
1650 return -ENOIOCTLCMD;
1651 }
1652}
1653
1654#ifdef CONFIG_COMPAT
1655struct compat_sioc_sg_req {
1656 struct in_addr src;
1657 struct in_addr grp;
1658 compat_ulong_t pktcnt;
1659 compat_ulong_t bytecnt;
1660 compat_ulong_t wrong_if;
1661};
1662
1663struct compat_sioc_vif_req {
1664 vifi_t vifi; /* Which iface */
1665 compat_ulong_t icount;
1666 compat_ulong_t ocount;
1667 compat_ulong_t ibytes;
1668 compat_ulong_t obytes;
1669};
1670
1671int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1672{
1673 struct compat_sioc_sg_req sr;
1674 struct compat_sioc_vif_req vr;
1675 struct vif_device *vif;
1676 struct mfc_cache *c;
1677 struct net *net = sock_net(sk);
1678 struct mr_table *mrt;
1679
1680 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1681 if (!mrt)
1682 return -ENOENT;
1683
1684 switch (cmd) {
1685 case SIOCGETVIFCNT:
1686 if (copy_from_user(&vr, arg, sizeof(vr)))
1687 return -EFAULT;
1688 if (vr.vifi >= mrt->maxvif)
1689 return -EINVAL;
1690 vr.vifi = array_index_nospec(vr.vifi, mrt->maxvif);
1691 rcu_read_lock();
1692 vif = &mrt->vif_table[vr.vifi];
1693 if (VIF_EXISTS(mrt, vr.vifi)) {
1694 vr.icount = READ_ONCE(vif->pkt_in);
1695 vr.ocount = READ_ONCE(vif->pkt_out);
1696 vr.ibytes = READ_ONCE(vif->bytes_in);
1697 vr.obytes = READ_ONCE(vif->bytes_out);
1698 rcu_read_unlock();
1699
1700 if (copy_to_user(arg, &vr, sizeof(vr)))
1701 return -EFAULT;
1702 return 0;
1703 }
1704 rcu_read_unlock();
1705 return -EADDRNOTAVAIL;
1706 case SIOCGETSGCNT:
1707 if (copy_from_user(&sr, arg, sizeof(sr)))
1708 return -EFAULT;
1709
1710 rcu_read_lock();
1711 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
1712 if (c) {
1713 sr.pktcnt = c->_c.mfc_un.res.pkt;
1714 sr.bytecnt = c->_c.mfc_un.res.bytes;
1715 sr.wrong_if = c->_c.mfc_un.res.wrong_if;
1716 rcu_read_unlock();
1717
1718 if (copy_to_user(arg, &sr, sizeof(sr)))
1719 return -EFAULT;
1720 return 0;
1721 }
1722 rcu_read_unlock();
1723 return -EADDRNOTAVAIL;
1724 default:
1725 return -ENOIOCTLCMD;
1726 }
1727}
1728#endif
1729
1730static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
1731{
1732 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1733 struct net *net = dev_net(dev);
1734 struct mr_table *mrt;
1735 struct vif_device *v;
1736 int ct;
1737
1738 if (event != NETDEV_UNREGISTER)
1739 return NOTIFY_DONE;
1740
1741 ipmr_for_each_table(mrt, net) {
1742 v = &mrt->vif_table[0];
1743 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1744 if (rcu_access_pointer(v->dev) == dev)
1745 vif_delete(mrt, ct, 1, NULL);
1746 }
1747 }
1748 return NOTIFY_DONE;
1749}
1750
1751static struct notifier_block ip_mr_notifier = {
1752 .notifier_call = ipmr_device_event,
1753};
1754
1755/* Encapsulate a packet by attaching a valid IPIP header to it.
1756 * This avoids tunnel drivers and other mess and gives us the speed so
1757 * important for multicast video.
1758 */
1759static void ip_encap(struct net *net, struct sk_buff *skb,
1760 __be32 saddr, __be32 daddr)
1761{
1762 struct iphdr *iph;
1763 const struct iphdr *old_iph = ip_hdr(skb);
1764
1765 skb_push(skb, sizeof(struct iphdr));
1766 skb->transport_header = skb->network_header;
1767 skb_reset_network_header(skb);
1768 iph = ip_hdr(skb);
1769
1770 iph->version = 4;
1771 iph->tos = old_iph->tos;
1772 iph->ttl = old_iph->ttl;
1773 iph->frag_off = 0;
1774 iph->daddr = daddr;
1775 iph->saddr = saddr;
1776 iph->protocol = IPPROTO_IPIP;
1777 iph->ihl = 5;
1778 iph->tot_len = htons(skb->len);
1779 ip_select_ident(net, skb, NULL);
1780 ip_send_check(iph);
1781
1782 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1783 nf_reset_ct(skb);
1784}
1785
1786static inline int ipmr_forward_finish(struct net *net, struct sock *sk,
1787 struct sk_buff *skb)
1788{
1789 struct ip_options *opt = &(IPCB(skb)->opt);
1790
1791 IP_INC_STATS(net, IPSTATS_MIB_OUTFORWDATAGRAMS);
1792 IP_ADD_STATS(net, IPSTATS_MIB_OUTOCTETS, skb->len);
1793
1794 if (unlikely(opt->optlen))
1795 ip_forward_options(skb);
1796
1797 return dst_output(net, sk, skb);
1798}
1799
1800#ifdef CONFIG_NET_SWITCHDEV
1801static bool ipmr_forward_offloaded(struct sk_buff *skb, struct mr_table *mrt,
1802 int in_vifi, int out_vifi)
1803{
1804 struct vif_device *out_vif = &mrt->vif_table[out_vifi];
1805 struct vif_device *in_vif = &mrt->vif_table[in_vifi];
1806
1807 if (!skb->offload_l3_fwd_mark)
1808 return false;
1809 if (!out_vif->dev_parent_id.id_len || !in_vif->dev_parent_id.id_len)
1810 return false;
1811 return netdev_phys_item_id_same(&out_vif->dev_parent_id,
1812 &in_vif->dev_parent_id);
1813}
1814#else
1815static bool ipmr_forward_offloaded(struct sk_buff *skb, struct mr_table *mrt,
1816 int in_vifi, int out_vifi)
1817{
1818 return false;
1819}
1820#endif
1821
1822/* Processing handlers for ipmr_forward, under rcu_read_lock() */
1823
1824static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
1825 int in_vifi, struct sk_buff *skb, int vifi)
1826{
1827 const struct iphdr *iph = ip_hdr(skb);
1828 struct vif_device *vif = &mrt->vif_table[vifi];
1829 struct net_device *vif_dev;
1830 struct net_device *dev;
1831 struct rtable *rt;
1832 struct flowi4 fl4;
1833 int encap = 0;
1834
1835 vif_dev = vif_dev_read(vif);
1836 if (!vif_dev)
1837 goto out_free;
1838
1839 if (vif->flags & VIFF_REGISTER) {
1840 WRITE_ONCE(vif->pkt_out, vif->pkt_out + 1);
1841 WRITE_ONCE(vif->bytes_out, vif->bytes_out + skb->len);
1842 DEV_STATS_ADD(vif_dev, tx_bytes, skb->len);
1843 DEV_STATS_INC(vif_dev, tx_packets);
1844 ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT);
1845 goto out_free;
1846 }
1847
1848 if (ipmr_forward_offloaded(skb, mrt, in_vifi, vifi))
1849 goto out_free;
1850
1851 if (vif->flags & VIFF_TUNNEL) {
1852 rt = ip_route_output_ports(net, &fl4, NULL,
1853 vif->remote, vif->local,
1854 0, 0,
1855 IPPROTO_IPIP,
1856 RT_TOS(iph->tos), vif->link);
1857 if (IS_ERR(rt))
1858 goto out_free;
1859 encap = sizeof(struct iphdr);
1860 } else {
1861 rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0,
1862 0, 0,
1863 IPPROTO_IPIP,
1864 RT_TOS(iph->tos), vif->link);
1865 if (IS_ERR(rt))
1866 goto out_free;
1867 }
1868
1869 dev = rt->dst.dev;
1870
1871 if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) {
1872 /* Do not fragment multicasts. Alas, IPv4 does not
1873 * allow to send ICMP, so that packets will disappear
1874 * to blackhole.
1875 */
1876 IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS);
1877 ip_rt_put(rt);
1878 goto out_free;
1879 }
1880
1881 encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len;
1882
1883 if (skb_cow(skb, encap)) {
1884 ip_rt_put(rt);
1885 goto out_free;
1886 }
1887
1888 WRITE_ONCE(vif->pkt_out, vif->pkt_out + 1);
1889 WRITE_ONCE(vif->bytes_out, vif->bytes_out + skb->len);
1890
1891 skb_dst_drop(skb);
1892 skb_dst_set(skb, &rt->dst);
1893 ip_decrease_ttl(ip_hdr(skb));
1894
1895 /* FIXME: forward and output firewalls used to be called here.
1896 * What do we do with netfilter? -- RR
1897 */
1898 if (vif->flags & VIFF_TUNNEL) {
1899 ip_encap(net, skb, vif->local, vif->remote);
1900 /* FIXME: extra output firewall step used to be here. --RR */
1901 DEV_STATS_INC(vif_dev, tx_packets);
1902 DEV_STATS_ADD(vif_dev, tx_bytes, skb->len);
1903 }
1904
1905 IPCB(skb)->flags |= IPSKB_FORWARDED;
1906
1907 /* RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
1908 * not only before forwarding, but after forwarding on all output
1909 * interfaces. It is clear, if mrouter runs a multicasting
1910 * program, it should receive packets not depending to what interface
1911 * program is joined.
1912 * If we will not make it, the program will have to join on all
1913 * interfaces. On the other hand, multihoming host (or router, but
1914 * not mrouter) cannot join to more than one interface - it will
1915 * result in receiving multiple packets.
1916 */
1917 NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD,
1918 net, NULL, skb, skb->dev, dev,
1919 ipmr_forward_finish);
1920 return;
1921
1922out_free:
1923 kfree_skb(skb);
1924}
1925
1926/* Called with mrt_lock or rcu_read_lock() */
1927static int ipmr_find_vif(const struct mr_table *mrt, struct net_device *dev)
1928{
1929 int ct;
1930 /* Pairs with WRITE_ONCE() in vif_delete()/vif_add() */
1931 for (ct = READ_ONCE(mrt->maxvif) - 1; ct >= 0; ct--) {
1932 if (rcu_access_pointer(mrt->vif_table[ct].dev) == dev)
1933 break;
1934 }
1935 return ct;
1936}
1937
1938/* "local" means that we should preserve one skb (for local delivery) */
1939/* Called uner rcu_read_lock() */
1940static void ip_mr_forward(struct net *net, struct mr_table *mrt,
1941 struct net_device *dev, struct sk_buff *skb,
1942 struct mfc_cache *c, int local)
1943{
1944 int true_vifi = ipmr_find_vif(mrt, dev);
1945 int psend = -1;
1946 int vif, ct;
1947
1948 vif = c->_c.mfc_parent;
1949 c->_c.mfc_un.res.pkt++;
1950 c->_c.mfc_un.res.bytes += skb->len;
1951 c->_c.mfc_un.res.lastuse = jiffies;
1952
1953 if (c->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) {
1954 struct mfc_cache *cache_proxy;
1955
1956 /* For an (*,G) entry, we only check that the incoming
1957 * interface is part of the static tree.
1958 */
1959 cache_proxy = mr_mfc_find_any_parent(mrt, vif);
1960 if (cache_proxy &&
1961 cache_proxy->_c.mfc_un.res.ttls[true_vifi] < 255)
1962 goto forward;
1963 }
1964
1965 /* Wrong interface: drop packet and (maybe) send PIM assert. */
1966 if (rcu_access_pointer(mrt->vif_table[vif].dev) != dev) {
1967 if (rt_is_output_route(skb_rtable(skb))) {
1968 /* It is our own packet, looped back.
1969 * Very complicated situation...
1970 *
1971 * The best workaround until routing daemons will be
1972 * fixed is not to redistribute packet, if it was
1973 * send through wrong interface. It means, that
1974 * multicast applications WILL NOT work for
1975 * (S,G), which have default multicast route pointing
1976 * to wrong oif. In any case, it is not a good
1977 * idea to use multicasting applications on router.
1978 */
1979 goto dont_forward;
1980 }
1981
1982 c->_c.mfc_un.res.wrong_if++;
1983
1984 if (true_vifi >= 0 && mrt->mroute_do_assert &&
1985 /* pimsm uses asserts, when switching from RPT to SPT,
1986 * so that we cannot check that packet arrived on an oif.
1987 * It is bad, but otherwise we would need to move pretty
1988 * large chunk of pimd to kernel. Ough... --ANK
1989 */
1990 (mrt->mroute_do_pim ||
1991 c->_c.mfc_un.res.ttls[true_vifi] < 255) &&
1992 time_after(jiffies,
1993 c->_c.mfc_un.res.last_assert +
1994 MFC_ASSERT_THRESH)) {
1995 c->_c.mfc_un.res.last_assert = jiffies;
1996 ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF);
1997 if (mrt->mroute_do_wrvifwhole)
1998 ipmr_cache_report(mrt, skb, true_vifi,
1999 IGMPMSG_WRVIFWHOLE);
2000 }
2001 goto dont_forward;
2002 }
2003
2004forward:
2005 WRITE_ONCE(mrt->vif_table[vif].pkt_in,
2006 mrt->vif_table[vif].pkt_in + 1);
2007 WRITE_ONCE(mrt->vif_table[vif].bytes_in,
2008 mrt->vif_table[vif].bytes_in + skb->len);
2009
2010 /* Forward the frame */
2011 if (c->mfc_origin == htonl(INADDR_ANY) &&
2012 c->mfc_mcastgrp == htonl(INADDR_ANY)) {
2013 if (true_vifi >= 0 &&
2014 true_vifi != c->_c.mfc_parent &&
2015 ip_hdr(skb)->ttl >
2016 c->_c.mfc_un.res.ttls[c->_c.mfc_parent]) {
2017 /* It's an (*,*) entry and the packet is not coming from
2018 * the upstream: forward the packet to the upstream
2019 * only.
2020 */
2021 psend = c->_c.mfc_parent;
2022 goto last_forward;
2023 }
2024 goto dont_forward;
2025 }
2026 for (ct = c->_c.mfc_un.res.maxvif - 1;
2027 ct >= c->_c.mfc_un.res.minvif; ct--) {
2028 /* For (*,G) entry, don't forward to the incoming interface */
2029 if ((c->mfc_origin != htonl(INADDR_ANY) ||
2030 ct != true_vifi) &&
2031 ip_hdr(skb)->ttl > c->_c.mfc_un.res.ttls[ct]) {
2032 if (psend != -1) {
2033 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2034
2035 if (skb2)
2036 ipmr_queue_xmit(net, mrt, true_vifi,
2037 skb2, psend);
2038 }
2039 psend = ct;
2040 }
2041 }
2042last_forward:
2043 if (psend != -1) {
2044 if (local) {
2045 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2046
2047 if (skb2)
2048 ipmr_queue_xmit(net, mrt, true_vifi, skb2,
2049 psend);
2050 } else {
2051 ipmr_queue_xmit(net, mrt, true_vifi, skb, psend);
2052 return;
2053 }
2054 }
2055
2056dont_forward:
2057 if (!local)
2058 kfree_skb(skb);
2059}
2060
2061static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb)
2062{
2063 struct rtable *rt = skb_rtable(skb);
2064 struct iphdr *iph = ip_hdr(skb);
2065 struct flowi4 fl4 = {
2066 .daddr = iph->daddr,
2067 .saddr = iph->saddr,
2068 .flowi4_tos = RT_TOS(iph->tos),
2069 .flowi4_oif = (rt_is_output_route(rt) ?
2070 skb->dev->ifindex : 0),
2071 .flowi4_iif = (rt_is_output_route(rt) ?
2072 LOOPBACK_IFINDEX :
2073 skb->dev->ifindex),
2074 .flowi4_mark = skb->mark,
2075 };
2076 struct mr_table *mrt;
2077 int err;
2078
2079 err = ipmr_fib_lookup(net, &fl4, &mrt);
2080 if (err)
2081 return ERR_PTR(err);
2082 return mrt;
2083}
2084
2085/* Multicast packets for forwarding arrive here
2086 * Called with rcu_read_lock();
2087 */
2088int ip_mr_input(struct sk_buff *skb)
2089{
2090 struct mfc_cache *cache;
2091 struct net *net = dev_net(skb->dev);
2092 int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL;
2093 struct mr_table *mrt;
2094 struct net_device *dev;
2095
2096 /* skb->dev passed in is the loX master dev for vrfs.
2097 * As there are no vifs associated with loopback devices,
2098 * get the proper interface that does have a vif associated with it.
2099 */
2100 dev = skb->dev;
2101 if (netif_is_l3_master(skb->dev)) {
2102 dev = dev_get_by_index_rcu(net, IPCB(skb)->iif);
2103 if (!dev) {
2104 kfree_skb(skb);
2105 return -ENODEV;
2106 }
2107 }
2108
2109 /* Packet is looped back after forward, it should not be
2110 * forwarded second time, but still can be delivered locally.
2111 */
2112 if (IPCB(skb)->flags & IPSKB_FORWARDED)
2113 goto dont_forward;
2114
2115 mrt = ipmr_rt_fib_lookup(net, skb);
2116 if (IS_ERR(mrt)) {
2117 kfree_skb(skb);
2118 return PTR_ERR(mrt);
2119 }
2120 if (!local) {
2121 if (IPCB(skb)->opt.router_alert) {
2122 if (ip_call_ra_chain(skb))
2123 return 0;
2124 } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) {
2125 /* IGMPv1 (and broken IGMPv2 implementations sort of
2126 * Cisco IOS <= 11.2(8)) do not put router alert
2127 * option to IGMP packets destined to routable
2128 * groups. It is very bad, because it means
2129 * that we can forward NO IGMP messages.
2130 */
2131 struct sock *mroute_sk;
2132
2133 mroute_sk = rcu_dereference(mrt->mroute_sk);
2134 if (mroute_sk) {
2135 nf_reset_ct(skb);
2136 raw_rcv(mroute_sk, skb);
2137 return 0;
2138 }
2139 }
2140 }
2141
2142 /* already under rcu_read_lock() */
2143 cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
2144 if (!cache) {
2145 int vif = ipmr_find_vif(mrt, dev);
2146
2147 if (vif >= 0)
2148 cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr,
2149 vif);
2150 }
2151
2152 /* No usable cache entry */
2153 if (!cache) {
2154 int vif;
2155
2156 if (local) {
2157 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2158 ip_local_deliver(skb);
2159 if (!skb2)
2160 return -ENOBUFS;
2161 skb = skb2;
2162 }
2163
2164 vif = ipmr_find_vif(mrt, dev);
2165 if (vif >= 0)
2166 return ipmr_cache_unresolved(mrt, vif, skb, dev);
2167 kfree_skb(skb);
2168 return -ENODEV;
2169 }
2170
2171 ip_mr_forward(net, mrt, dev, skb, cache, local);
2172
2173 if (local)
2174 return ip_local_deliver(skb);
2175
2176 return 0;
2177
2178dont_forward:
2179 if (local)
2180 return ip_local_deliver(skb);
2181 kfree_skb(skb);
2182 return 0;
2183}
2184
2185#ifdef CONFIG_IP_PIMSM_V1
2186/* Handle IGMP messages of PIMv1 */
2187int pim_rcv_v1(struct sk_buff *skb)
2188{
2189 struct igmphdr *pim;
2190 struct net *net = dev_net(skb->dev);
2191 struct mr_table *mrt;
2192
2193 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
2194 goto drop;
2195
2196 pim = igmp_hdr(skb);
2197
2198 mrt = ipmr_rt_fib_lookup(net, skb);
2199 if (IS_ERR(mrt))
2200 goto drop;
2201 if (!mrt->mroute_do_pim ||
2202 pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER)
2203 goto drop;
2204
2205 if (__pim_rcv(mrt, skb, sizeof(*pim))) {
2206drop:
2207 kfree_skb(skb);
2208 }
2209 return 0;
2210}
2211#endif
2212
2213#ifdef CONFIG_IP_PIMSM_V2
2214static int pim_rcv(struct sk_buff *skb)
2215{
2216 struct pimreghdr *pim;
2217 struct net *net = dev_net(skb->dev);
2218 struct mr_table *mrt;
2219
2220 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
2221 goto drop;
2222
2223 pim = (struct pimreghdr *)skb_transport_header(skb);
2224 if (pim->type != ((PIM_VERSION << 4) | (PIM_TYPE_REGISTER)) ||
2225 (pim->flags & PIM_NULL_REGISTER) ||
2226 (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 &&
2227 csum_fold(skb_checksum(skb, 0, skb->len, 0))))
2228 goto drop;
2229
2230 mrt = ipmr_rt_fib_lookup(net, skb);
2231 if (IS_ERR(mrt))
2232 goto drop;
2233 if (__pim_rcv(mrt, skb, sizeof(*pim))) {
2234drop:
2235 kfree_skb(skb);
2236 }
2237 return 0;
2238}
2239#endif
2240
2241int ipmr_get_route(struct net *net, struct sk_buff *skb,
2242 __be32 saddr, __be32 daddr,
2243 struct rtmsg *rtm, u32 portid)
2244{
2245 struct mfc_cache *cache;
2246 struct mr_table *mrt;
2247 int err;
2248
2249 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2250 if (!mrt)
2251 return -ENOENT;
2252
2253 rcu_read_lock();
2254 cache = ipmr_cache_find(mrt, saddr, daddr);
2255 if (!cache && skb->dev) {
2256 int vif = ipmr_find_vif(mrt, skb->dev);
2257
2258 if (vif >= 0)
2259 cache = ipmr_cache_find_any(mrt, daddr, vif);
2260 }
2261 if (!cache) {
2262 struct sk_buff *skb2;
2263 struct iphdr *iph;
2264 struct net_device *dev;
2265 int vif = -1;
2266
2267 dev = skb->dev;
2268 if (dev)
2269 vif = ipmr_find_vif(mrt, dev);
2270 if (vif < 0) {
2271 rcu_read_unlock();
2272 return -ENODEV;
2273 }
2274
2275 skb2 = skb_realloc_headroom(skb, sizeof(struct iphdr));
2276 if (!skb2) {
2277 rcu_read_unlock();
2278 return -ENOMEM;
2279 }
2280
2281 NETLINK_CB(skb2).portid = portid;
2282 skb_push(skb2, sizeof(struct iphdr));
2283 skb_reset_network_header(skb2);
2284 iph = ip_hdr(skb2);
2285 iph->ihl = sizeof(struct iphdr) >> 2;
2286 iph->saddr = saddr;
2287 iph->daddr = daddr;
2288 iph->version = 0;
2289 err = ipmr_cache_unresolved(mrt, vif, skb2, dev);
2290 rcu_read_unlock();
2291 return err;
2292 }
2293
2294 err = mr_fill_mroute(mrt, skb, &cache->_c, rtm);
2295 rcu_read_unlock();
2296 return err;
2297}
2298
2299static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2300 u32 portid, u32 seq, struct mfc_cache *c, int cmd,
2301 int flags)
2302{
2303 struct nlmsghdr *nlh;
2304 struct rtmsg *rtm;
2305 int err;
2306
2307 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
2308 if (!nlh)
2309 return -EMSGSIZE;
2310
2311 rtm = nlmsg_data(nlh);
2312 rtm->rtm_family = RTNL_FAMILY_IPMR;
2313 rtm->rtm_dst_len = 32;
2314 rtm->rtm_src_len = 32;
2315 rtm->rtm_tos = 0;
2316 rtm->rtm_table = mrt->id;
2317 if (nla_put_u32(skb, RTA_TABLE, mrt->id))
2318 goto nla_put_failure;
2319 rtm->rtm_type = RTN_MULTICAST;
2320 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2321 if (c->_c.mfc_flags & MFC_STATIC)
2322 rtm->rtm_protocol = RTPROT_STATIC;
2323 else
2324 rtm->rtm_protocol = RTPROT_MROUTED;
2325 rtm->rtm_flags = 0;
2326
2327 if (nla_put_in_addr(skb, RTA_SRC, c->mfc_origin) ||
2328 nla_put_in_addr(skb, RTA_DST, c->mfc_mcastgrp))
2329 goto nla_put_failure;
2330 err = mr_fill_mroute(mrt, skb, &c->_c, rtm);
2331 /* do not break the dump if cache is unresolved */
2332 if (err < 0 && err != -ENOENT)
2333 goto nla_put_failure;
2334
2335 nlmsg_end(skb, nlh);
2336 return 0;
2337
2338nla_put_failure:
2339 nlmsg_cancel(skb, nlh);
2340 return -EMSGSIZE;
2341}
2342
2343static int _ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2344 u32 portid, u32 seq, struct mr_mfc *c, int cmd,
2345 int flags)
2346{
2347 return ipmr_fill_mroute(mrt, skb, portid, seq, (struct mfc_cache *)c,
2348 cmd, flags);
2349}
2350
2351static size_t mroute_msgsize(bool unresolved, int maxvif)
2352{
2353 size_t len =
2354 NLMSG_ALIGN(sizeof(struct rtmsg))
2355 + nla_total_size(4) /* RTA_TABLE */
2356 + nla_total_size(4) /* RTA_SRC */
2357 + nla_total_size(4) /* RTA_DST */
2358 ;
2359
2360 if (!unresolved)
2361 len = len
2362 + nla_total_size(4) /* RTA_IIF */
2363 + nla_total_size(0) /* RTA_MULTIPATH */
2364 + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
2365 /* RTA_MFC_STATS */
2366 + nla_total_size_64bit(sizeof(struct rta_mfc_stats))
2367 ;
2368
2369 return len;
2370}
2371
2372static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
2373 int cmd)
2374{
2375 struct net *net = read_pnet(&mrt->net);
2376 struct sk_buff *skb;
2377 int err = -ENOBUFS;
2378
2379 skb = nlmsg_new(mroute_msgsize(mfc->_c.mfc_parent >= MAXVIFS,
2380 mrt->maxvif),
2381 GFP_ATOMIC);
2382 if (!skb)
2383 goto errout;
2384
2385 err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
2386 if (err < 0)
2387 goto errout;
2388
2389 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE, NULL, GFP_ATOMIC);
2390 return;
2391
2392errout:
2393 kfree_skb(skb);
2394 if (err < 0)
2395 rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE, err);
2396}
2397
2398static size_t igmpmsg_netlink_msgsize(size_t payloadlen)
2399{
2400 size_t len =
2401 NLMSG_ALIGN(sizeof(struct rtgenmsg))
2402 + nla_total_size(1) /* IPMRA_CREPORT_MSGTYPE */
2403 + nla_total_size(4) /* IPMRA_CREPORT_VIF_ID */
2404 + nla_total_size(4) /* IPMRA_CREPORT_SRC_ADDR */
2405 + nla_total_size(4) /* IPMRA_CREPORT_DST_ADDR */
2406 + nla_total_size(4) /* IPMRA_CREPORT_TABLE */
2407 /* IPMRA_CREPORT_PKT */
2408 + nla_total_size(payloadlen)
2409 ;
2410
2411 return len;
2412}
2413
2414static void igmpmsg_netlink_event(const struct mr_table *mrt, struct sk_buff *pkt)
2415{
2416 struct net *net = read_pnet(&mrt->net);
2417 struct nlmsghdr *nlh;
2418 struct rtgenmsg *rtgenm;
2419 struct igmpmsg *msg;
2420 struct sk_buff *skb;
2421 struct nlattr *nla;
2422 int payloadlen;
2423
2424 payloadlen = pkt->len - sizeof(struct igmpmsg);
2425 msg = (struct igmpmsg *)skb_network_header(pkt);
2426
2427 skb = nlmsg_new(igmpmsg_netlink_msgsize(payloadlen), GFP_ATOMIC);
2428 if (!skb)
2429 goto errout;
2430
2431 nlh = nlmsg_put(skb, 0, 0, RTM_NEWCACHEREPORT,
2432 sizeof(struct rtgenmsg), 0);
2433 if (!nlh)
2434 goto errout;
2435 rtgenm = nlmsg_data(nlh);
2436 rtgenm->rtgen_family = RTNL_FAMILY_IPMR;
2437 if (nla_put_u8(skb, IPMRA_CREPORT_MSGTYPE, msg->im_msgtype) ||
2438 nla_put_u32(skb, IPMRA_CREPORT_VIF_ID, msg->im_vif | (msg->im_vif_hi << 8)) ||
2439 nla_put_in_addr(skb, IPMRA_CREPORT_SRC_ADDR,
2440 msg->im_src.s_addr) ||
2441 nla_put_in_addr(skb, IPMRA_CREPORT_DST_ADDR,
2442 msg->im_dst.s_addr) ||
2443 nla_put_u32(skb, IPMRA_CREPORT_TABLE, mrt->id))
2444 goto nla_put_failure;
2445
2446 nla = nla_reserve(skb, IPMRA_CREPORT_PKT, payloadlen);
2447 if (!nla || skb_copy_bits(pkt, sizeof(struct igmpmsg),
2448 nla_data(nla), payloadlen))
2449 goto nla_put_failure;
2450
2451 nlmsg_end(skb, nlh);
2452
2453 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE_R, NULL, GFP_ATOMIC);
2454 return;
2455
2456nla_put_failure:
2457 nlmsg_cancel(skb, nlh);
2458errout:
2459 kfree_skb(skb);
2460 rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE_R, -ENOBUFS);
2461}
2462
2463static int ipmr_rtm_valid_getroute_req(struct sk_buff *skb,
2464 const struct nlmsghdr *nlh,
2465 struct nlattr **tb,
2466 struct netlink_ext_ack *extack)
2467{
2468 struct rtmsg *rtm;
2469 int i, err;
2470
2471 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
2472 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for multicast route get request");
2473 return -EINVAL;
2474 }
2475
2476 if (!netlink_strict_get_check(skb))
2477 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
2478 rtm_ipv4_policy, extack);
2479
2480 rtm = nlmsg_data(nlh);
2481 if ((rtm->rtm_src_len && rtm->rtm_src_len != 32) ||
2482 (rtm->rtm_dst_len && rtm->rtm_dst_len != 32) ||
2483 rtm->rtm_tos || rtm->rtm_table || rtm->rtm_protocol ||
2484 rtm->rtm_scope || rtm->rtm_type || rtm->rtm_flags) {
2485 NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for multicast route get request");
2486 return -EINVAL;
2487 }
2488
2489 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
2490 rtm_ipv4_policy, extack);
2491 if (err)
2492 return err;
2493
2494 if ((tb[RTA_SRC] && !rtm->rtm_src_len) ||
2495 (tb[RTA_DST] && !rtm->rtm_dst_len)) {
2496 NL_SET_ERR_MSG(extack, "ipv4: rtm_src_len and rtm_dst_len must be 32 for IPv4");
2497 return -EINVAL;
2498 }
2499
2500 for (i = 0; i <= RTA_MAX; i++) {
2501 if (!tb[i])
2502 continue;
2503
2504 switch (i) {
2505 case RTA_SRC:
2506 case RTA_DST:
2507 case RTA_TABLE:
2508 break;
2509 default:
2510 NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in multicast route get request");
2511 return -EINVAL;
2512 }
2513 }
2514
2515 return 0;
2516}
2517
2518static int ipmr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
2519 struct netlink_ext_ack *extack)
2520{
2521 struct net *net = sock_net(in_skb->sk);
2522 struct nlattr *tb[RTA_MAX + 1];
2523 struct sk_buff *skb = NULL;
2524 struct mfc_cache *cache;
2525 struct mr_table *mrt;
2526 __be32 src, grp;
2527 u32 tableid;
2528 int err;
2529
2530 err = ipmr_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
2531 if (err < 0)
2532 goto errout;
2533
2534 src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0;
2535 grp = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0;
2536 tableid = tb[RTA_TABLE] ? nla_get_u32(tb[RTA_TABLE]) : 0;
2537
2538 mrt = ipmr_get_table(net, tableid ? tableid : RT_TABLE_DEFAULT);
2539 if (!mrt) {
2540 err = -ENOENT;
2541 goto errout_free;
2542 }
2543
2544 /* entries are added/deleted only under RTNL */
2545 rcu_read_lock();
2546 cache = ipmr_cache_find(mrt, src, grp);
2547 rcu_read_unlock();
2548 if (!cache) {
2549 err = -ENOENT;
2550 goto errout_free;
2551 }
2552
2553 skb = nlmsg_new(mroute_msgsize(false, mrt->maxvif), GFP_KERNEL);
2554 if (!skb) {
2555 err = -ENOBUFS;
2556 goto errout_free;
2557 }
2558
2559 err = ipmr_fill_mroute(mrt, skb, NETLINK_CB(in_skb).portid,
2560 nlh->nlmsg_seq, cache,
2561 RTM_NEWROUTE, 0);
2562 if (err < 0)
2563 goto errout_free;
2564
2565 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2566
2567errout:
2568 return err;
2569
2570errout_free:
2571 kfree_skb(skb);
2572 goto errout;
2573}
2574
2575static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2576{
2577 struct fib_dump_filter filter = {};
2578 int err;
2579
2580 if (cb->strict_check) {
2581 err = ip_valid_fib_dump_req(sock_net(skb->sk), cb->nlh,
2582 &filter, cb);
2583 if (err < 0)
2584 return err;
2585 }
2586
2587 if (filter.table_id) {
2588 struct mr_table *mrt;
2589
2590 mrt = ipmr_get_table(sock_net(skb->sk), filter.table_id);
2591 if (!mrt) {
2592 if (rtnl_msg_family(cb->nlh) != RTNL_FAMILY_IPMR)
2593 return skb->len;
2594
2595 NL_SET_ERR_MSG(cb->extack, "ipv4: MR table does not exist");
2596 return -ENOENT;
2597 }
2598 err = mr_table_dump(mrt, skb, cb, _ipmr_fill_mroute,
2599 &mfc_unres_lock, &filter);
2600 return skb->len ? : err;
2601 }
2602
2603 return mr_rtm_dumproute(skb, cb, ipmr_mr_table_iter,
2604 _ipmr_fill_mroute, &mfc_unres_lock, &filter);
2605}
2606
2607static const struct nla_policy rtm_ipmr_policy[RTA_MAX + 1] = {
2608 [RTA_SRC] = { .type = NLA_U32 },
2609 [RTA_DST] = { .type = NLA_U32 },
2610 [RTA_IIF] = { .type = NLA_U32 },
2611 [RTA_TABLE] = { .type = NLA_U32 },
2612 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2613};
2614
2615static bool ipmr_rtm_validate_proto(unsigned char rtm_protocol)
2616{
2617 switch (rtm_protocol) {
2618 case RTPROT_STATIC:
2619 case RTPROT_MROUTED:
2620 return true;
2621 }
2622 return false;
2623}
2624
2625static int ipmr_nla_get_ttls(const struct nlattr *nla, struct mfcctl *mfcc)
2626{
2627 struct rtnexthop *rtnh = nla_data(nla);
2628 int remaining = nla_len(nla), vifi = 0;
2629
2630 while (rtnh_ok(rtnh, remaining)) {
2631 mfcc->mfcc_ttls[vifi] = rtnh->rtnh_hops;
2632 if (++vifi == MAXVIFS)
2633 break;
2634 rtnh = rtnh_next(rtnh, &remaining);
2635 }
2636
2637 return remaining > 0 ? -EINVAL : vifi;
2638}
2639
2640/* returns < 0 on error, 0 for ADD_MFC and 1 for ADD_MFC_PROXY */
2641static int rtm_to_ipmr_mfcc(struct net *net, struct nlmsghdr *nlh,
2642 struct mfcctl *mfcc, int *mrtsock,
2643 struct mr_table **mrtret,
2644 struct netlink_ext_ack *extack)
2645{
2646 struct net_device *dev = NULL;
2647 u32 tblid = RT_TABLE_DEFAULT;
2648 struct mr_table *mrt;
2649 struct nlattr *attr;
2650 struct rtmsg *rtm;
2651 int ret, rem;
2652
2653 ret = nlmsg_validate_deprecated(nlh, sizeof(*rtm), RTA_MAX,
2654 rtm_ipmr_policy, extack);
2655 if (ret < 0)
2656 goto out;
2657 rtm = nlmsg_data(nlh);
2658
2659 ret = -EINVAL;
2660 if (rtm->rtm_family != RTNL_FAMILY_IPMR || rtm->rtm_dst_len != 32 ||
2661 rtm->rtm_type != RTN_MULTICAST ||
2662 rtm->rtm_scope != RT_SCOPE_UNIVERSE ||
2663 !ipmr_rtm_validate_proto(rtm->rtm_protocol))
2664 goto out;
2665
2666 memset(mfcc, 0, sizeof(*mfcc));
2667 mfcc->mfcc_parent = -1;
2668 ret = 0;
2669 nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), rem) {
2670 switch (nla_type(attr)) {
2671 case RTA_SRC:
2672 mfcc->mfcc_origin.s_addr = nla_get_be32(attr);
2673 break;
2674 case RTA_DST:
2675 mfcc->mfcc_mcastgrp.s_addr = nla_get_be32(attr);
2676 break;
2677 case RTA_IIF:
2678 dev = __dev_get_by_index(net, nla_get_u32(attr));
2679 if (!dev) {
2680 ret = -ENODEV;
2681 goto out;
2682 }
2683 break;
2684 case RTA_MULTIPATH:
2685 if (ipmr_nla_get_ttls(attr, mfcc) < 0) {
2686 ret = -EINVAL;
2687 goto out;
2688 }
2689 break;
2690 case RTA_PREFSRC:
2691 ret = 1;
2692 break;
2693 case RTA_TABLE:
2694 tblid = nla_get_u32(attr);
2695 break;
2696 }
2697 }
2698 mrt = ipmr_get_table(net, tblid);
2699 if (!mrt) {
2700 ret = -ENOENT;
2701 goto out;
2702 }
2703 *mrtret = mrt;
2704 *mrtsock = rtm->rtm_protocol == RTPROT_MROUTED ? 1 : 0;
2705 if (dev)
2706 mfcc->mfcc_parent = ipmr_find_vif(mrt, dev);
2707
2708out:
2709 return ret;
2710}
2711
2712/* takes care of both newroute and delroute */
2713static int ipmr_rtm_route(struct sk_buff *skb, struct nlmsghdr *nlh,
2714 struct netlink_ext_ack *extack)
2715{
2716 struct net *net = sock_net(skb->sk);
2717 int ret, mrtsock, parent;
2718 struct mr_table *tbl;
2719 struct mfcctl mfcc;
2720
2721 mrtsock = 0;
2722 tbl = NULL;
2723 ret = rtm_to_ipmr_mfcc(net, nlh, &mfcc, &mrtsock, &tbl, extack);
2724 if (ret < 0)
2725 return ret;
2726
2727 parent = ret ? mfcc.mfcc_parent : -1;
2728 if (nlh->nlmsg_type == RTM_NEWROUTE)
2729 return ipmr_mfc_add(net, tbl, &mfcc, mrtsock, parent);
2730 else
2731 return ipmr_mfc_delete(tbl, &mfcc, parent);
2732}
2733
2734static bool ipmr_fill_table(struct mr_table *mrt, struct sk_buff *skb)
2735{
2736 u32 queue_len = atomic_read(&mrt->cache_resolve_queue_len);
2737
2738 if (nla_put_u32(skb, IPMRA_TABLE_ID, mrt->id) ||
2739 nla_put_u32(skb, IPMRA_TABLE_CACHE_RES_QUEUE_LEN, queue_len) ||
2740 nla_put_s32(skb, IPMRA_TABLE_MROUTE_REG_VIF_NUM,
2741 mrt->mroute_reg_vif_num) ||
2742 nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_ASSERT,
2743 mrt->mroute_do_assert) ||
2744 nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_PIM, mrt->mroute_do_pim) ||
2745 nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_WRVIFWHOLE,
2746 mrt->mroute_do_wrvifwhole))
2747 return false;
2748
2749 return true;
2750}
2751
2752static bool ipmr_fill_vif(struct mr_table *mrt, u32 vifid, struct sk_buff *skb)
2753{
2754 struct net_device *vif_dev;
2755 struct nlattr *vif_nest;
2756 struct vif_device *vif;
2757
2758 vif = &mrt->vif_table[vifid];
2759 vif_dev = rtnl_dereference(vif->dev);
2760 /* if the VIF doesn't exist just continue */
2761 if (!vif_dev)
2762 return true;
2763
2764 vif_nest = nla_nest_start_noflag(skb, IPMRA_VIF);
2765 if (!vif_nest)
2766 return false;
2767
2768 if (nla_put_u32(skb, IPMRA_VIFA_IFINDEX, vif_dev->ifindex) ||
2769 nla_put_u32(skb, IPMRA_VIFA_VIF_ID, vifid) ||
2770 nla_put_u16(skb, IPMRA_VIFA_FLAGS, vif->flags) ||
2771 nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_IN, vif->bytes_in,
2772 IPMRA_VIFA_PAD) ||
2773 nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_OUT, vif->bytes_out,
2774 IPMRA_VIFA_PAD) ||
2775 nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_IN, vif->pkt_in,
2776 IPMRA_VIFA_PAD) ||
2777 nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_OUT, vif->pkt_out,
2778 IPMRA_VIFA_PAD) ||
2779 nla_put_be32(skb, IPMRA_VIFA_LOCAL_ADDR, vif->local) ||
2780 nla_put_be32(skb, IPMRA_VIFA_REMOTE_ADDR, vif->remote)) {
2781 nla_nest_cancel(skb, vif_nest);
2782 return false;
2783 }
2784 nla_nest_end(skb, vif_nest);
2785
2786 return true;
2787}
2788
2789static int ipmr_valid_dumplink(const struct nlmsghdr *nlh,
2790 struct netlink_ext_ack *extack)
2791{
2792 struct ifinfomsg *ifm;
2793
2794 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
2795 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for ipmr link dump");
2796 return -EINVAL;
2797 }
2798
2799 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
2800 NL_SET_ERR_MSG(extack, "Invalid data after header in ipmr link dump");
2801 return -EINVAL;
2802 }
2803
2804 ifm = nlmsg_data(nlh);
2805 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
2806 ifm->ifi_change || ifm->ifi_index) {
2807 NL_SET_ERR_MSG(extack, "Invalid values in header for ipmr link dump request");
2808 return -EINVAL;
2809 }
2810
2811 return 0;
2812}
2813
2814static int ipmr_rtm_dumplink(struct sk_buff *skb, struct netlink_callback *cb)
2815{
2816 struct net *net = sock_net(skb->sk);
2817 struct nlmsghdr *nlh = NULL;
2818 unsigned int t = 0, s_t;
2819 unsigned int e = 0, s_e;
2820 struct mr_table *mrt;
2821
2822 if (cb->strict_check) {
2823 int err = ipmr_valid_dumplink(cb->nlh, cb->extack);
2824
2825 if (err < 0)
2826 return err;
2827 }
2828
2829 s_t = cb->args[0];
2830 s_e = cb->args[1];
2831
2832 ipmr_for_each_table(mrt, net) {
2833 struct nlattr *vifs, *af;
2834 struct ifinfomsg *hdr;
2835 u32 i;
2836
2837 if (t < s_t)
2838 goto skip_table;
2839 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
2840 cb->nlh->nlmsg_seq, RTM_NEWLINK,
2841 sizeof(*hdr), NLM_F_MULTI);
2842 if (!nlh)
2843 break;
2844
2845 hdr = nlmsg_data(nlh);
2846 memset(hdr, 0, sizeof(*hdr));
2847 hdr->ifi_family = RTNL_FAMILY_IPMR;
2848
2849 af = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
2850 if (!af) {
2851 nlmsg_cancel(skb, nlh);
2852 goto out;
2853 }
2854
2855 if (!ipmr_fill_table(mrt, skb)) {
2856 nlmsg_cancel(skb, nlh);
2857 goto out;
2858 }
2859
2860 vifs = nla_nest_start_noflag(skb, IPMRA_TABLE_VIFS);
2861 if (!vifs) {
2862 nla_nest_end(skb, af);
2863 nlmsg_end(skb, nlh);
2864 goto out;
2865 }
2866 for (i = 0; i < mrt->maxvif; i++) {
2867 if (e < s_e)
2868 goto skip_entry;
2869 if (!ipmr_fill_vif(mrt, i, skb)) {
2870 nla_nest_end(skb, vifs);
2871 nla_nest_end(skb, af);
2872 nlmsg_end(skb, nlh);
2873 goto out;
2874 }
2875skip_entry:
2876 e++;
2877 }
2878 s_e = 0;
2879 e = 0;
2880 nla_nest_end(skb, vifs);
2881 nla_nest_end(skb, af);
2882 nlmsg_end(skb, nlh);
2883skip_table:
2884 t++;
2885 }
2886
2887out:
2888 cb->args[1] = e;
2889 cb->args[0] = t;
2890
2891 return skb->len;
2892}
2893
2894#ifdef CONFIG_PROC_FS
2895/* The /proc interfaces to multicast routing :
2896 * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif
2897 */
2898
2899static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos)
2900 __acquires(RCU)
2901{
2902 struct mr_vif_iter *iter = seq->private;
2903 struct net *net = seq_file_net(seq);
2904 struct mr_table *mrt;
2905
2906 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2907 if (!mrt)
2908 return ERR_PTR(-ENOENT);
2909
2910 iter->mrt = mrt;
2911
2912 rcu_read_lock();
2913 return mr_vif_seq_start(seq, pos);
2914}
2915
2916static void ipmr_vif_seq_stop(struct seq_file *seq, void *v)
2917 __releases(RCU)
2918{
2919 rcu_read_unlock();
2920}
2921
2922static int ipmr_vif_seq_show(struct seq_file *seq, void *v)
2923{
2924 struct mr_vif_iter *iter = seq->private;
2925 struct mr_table *mrt = iter->mrt;
2926
2927 if (v == SEQ_START_TOKEN) {
2928 seq_puts(seq,
2929 "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n");
2930 } else {
2931 const struct vif_device *vif = v;
2932 const struct net_device *vif_dev;
2933 const char *name;
2934
2935 vif_dev = vif_dev_read(vif);
2936 name = vif_dev ? vif_dev->name : "none";
2937 seq_printf(seq,
2938 "%2td %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n",
2939 vif - mrt->vif_table,
2940 name, vif->bytes_in, vif->pkt_in,
2941 vif->bytes_out, vif->pkt_out,
2942 vif->flags, vif->local, vif->remote);
2943 }
2944 return 0;
2945}
2946
2947static const struct seq_operations ipmr_vif_seq_ops = {
2948 .start = ipmr_vif_seq_start,
2949 .next = mr_vif_seq_next,
2950 .stop = ipmr_vif_seq_stop,
2951 .show = ipmr_vif_seq_show,
2952};
2953
2954static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
2955{
2956 struct net *net = seq_file_net(seq);
2957 struct mr_table *mrt;
2958
2959 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2960 if (!mrt)
2961 return ERR_PTR(-ENOENT);
2962
2963 return mr_mfc_seq_start(seq, pos, mrt, &mfc_unres_lock);
2964}
2965
2966static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
2967{
2968 int n;
2969
2970 if (v == SEQ_START_TOKEN) {
2971 seq_puts(seq,
2972 "Group Origin Iif Pkts Bytes Wrong Oifs\n");
2973 } else {
2974 const struct mfc_cache *mfc = v;
2975 const struct mr_mfc_iter *it = seq->private;
2976 const struct mr_table *mrt = it->mrt;
2977
2978 seq_printf(seq, "%08X %08X %-3hd",
2979 (__force u32) mfc->mfc_mcastgrp,
2980 (__force u32) mfc->mfc_origin,
2981 mfc->_c.mfc_parent);
2982
2983 if (it->cache != &mrt->mfc_unres_queue) {
2984 seq_printf(seq, " %8lu %8lu %8lu",
2985 mfc->_c.mfc_un.res.pkt,
2986 mfc->_c.mfc_un.res.bytes,
2987 mfc->_c.mfc_un.res.wrong_if);
2988 for (n = mfc->_c.mfc_un.res.minvif;
2989 n < mfc->_c.mfc_un.res.maxvif; n++) {
2990 if (VIF_EXISTS(mrt, n) &&
2991 mfc->_c.mfc_un.res.ttls[n] < 255)
2992 seq_printf(seq,
2993 " %2d:%-3d",
2994 n, mfc->_c.mfc_un.res.ttls[n]);
2995 }
2996 } else {
2997 /* unresolved mfc_caches don't contain
2998 * pkt, bytes and wrong_if values
2999 */
3000 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
3001 }
3002 seq_putc(seq, '\n');
3003 }
3004 return 0;
3005}
3006
3007static const struct seq_operations ipmr_mfc_seq_ops = {
3008 .start = ipmr_mfc_seq_start,
3009 .next = mr_mfc_seq_next,
3010 .stop = mr_mfc_seq_stop,
3011 .show = ipmr_mfc_seq_show,
3012};
3013#endif
3014
3015#ifdef CONFIG_IP_PIMSM_V2
3016static const struct net_protocol pim_protocol = {
3017 .handler = pim_rcv,
3018};
3019#endif
3020
3021static unsigned int ipmr_seq_read(struct net *net)
3022{
3023 ASSERT_RTNL();
3024
3025 return net->ipv4.ipmr_seq + ipmr_rules_seq_read(net);
3026}
3027
3028static int ipmr_dump(struct net *net, struct notifier_block *nb,
3029 struct netlink_ext_ack *extack)
3030{
3031 return mr_dump(net, nb, RTNL_FAMILY_IPMR, ipmr_rules_dump,
3032 ipmr_mr_table_iter, extack);
3033}
3034
3035static const struct fib_notifier_ops ipmr_notifier_ops_template = {
3036 .family = RTNL_FAMILY_IPMR,
3037 .fib_seq_read = ipmr_seq_read,
3038 .fib_dump = ipmr_dump,
3039 .owner = THIS_MODULE,
3040};
3041
3042static int __net_init ipmr_notifier_init(struct net *net)
3043{
3044 struct fib_notifier_ops *ops;
3045
3046 net->ipv4.ipmr_seq = 0;
3047
3048 ops = fib_notifier_ops_register(&ipmr_notifier_ops_template, net);
3049 if (IS_ERR(ops))
3050 return PTR_ERR(ops);
3051 net->ipv4.ipmr_notifier_ops = ops;
3052
3053 return 0;
3054}
3055
3056static void __net_exit ipmr_notifier_exit(struct net *net)
3057{
3058 fib_notifier_ops_unregister(net->ipv4.ipmr_notifier_ops);
3059 net->ipv4.ipmr_notifier_ops = NULL;
3060}
3061
3062/* Setup for IP multicast routing */
3063static int __net_init ipmr_net_init(struct net *net)
3064{
3065 int err;
3066
3067 err = ipmr_notifier_init(net);
3068 if (err)
3069 goto ipmr_notifier_fail;
3070
3071 err = ipmr_rules_init(net);
3072 if (err < 0)
3073 goto ipmr_rules_fail;
3074
3075#ifdef CONFIG_PROC_FS
3076 err = -ENOMEM;
3077 if (!proc_create_net("ip_mr_vif", 0, net->proc_net, &ipmr_vif_seq_ops,
3078 sizeof(struct mr_vif_iter)))
3079 goto proc_vif_fail;
3080 if (!proc_create_net("ip_mr_cache", 0, net->proc_net, &ipmr_mfc_seq_ops,
3081 sizeof(struct mr_mfc_iter)))
3082 goto proc_cache_fail;
3083#endif
3084 return 0;
3085
3086#ifdef CONFIG_PROC_FS
3087proc_cache_fail:
3088 remove_proc_entry("ip_mr_vif", net->proc_net);
3089proc_vif_fail:
3090 rtnl_lock();
3091 ipmr_rules_exit(net);
3092 rtnl_unlock();
3093#endif
3094ipmr_rules_fail:
3095 ipmr_notifier_exit(net);
3096ipmr_notifier_fail:
3097 return err;
3098}
3099
3100static void __net_exit ipmr_net_exit(struct net *net)
3101{
3102#ifdef CONFIG_PROC_FS
3103 remove_proc_entry("ip_mr_cache", net->proc_net);
3104 remove_proc_entry("ip_mr_vif", net->proc_net);
3105#endif
3106 ipmr_notifier_exit(net);
3107}
3108
3109static void __net_exit ipmr_net_exit_batch(struct list_head *net_list)
3110{
3111 struct net *net;
3112
3113 rtnl_lock();
3114 list_for_each_entry(net, net_list, exit_list)
3115 ipmr_rules_exit(net);
3116 rtnl_unlock();
3117}
3118
3119static struct pernet_operations ipmr_net_ops = {
3120 .init = ipmr_net_init,
3121 .exit = ipmr_net_exit,
3122 .exit_batch = ipmr_net_exit_batch,
3123};
3124
3125int __init ip_mr_init(void)
3126{
3127 int err;
3128
3129 mrt_cachep = kmem_cache_create("ip_mrt_cache",
3130 sizeof(struct mfc_cache),
3131 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC,
3132 NULL);
3133
3134 err = register_pernet_subsys(&ipmr_net_ops);
3135 if (err)
3136 goto reg_pernet_fail;
3137
3138 err = register_netdevice_notifier(&ip_mr_notifier);
3139 if (err)
3140 goto reg_notif_fail;
3141#ifdef CONFIG_IP_PIMSM_V2
3142 if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) {
3143 pr_err("%s: can't add PIM protocol\n", __func__);
3144 err = -EAGAIN;
3145 goto add_proto_fail;
3146 }
3147#endif
3148 rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE,
3149 ipmr_rtm_getroute, ipmr_rtm_dumproute, 0);
3150 rtnl_register(RTNL_FAMILY_IPMR, RTM_NEWROUTE,
3151 ipmr_rtm_route, NULL, 0);
3152 rtnl_register(RTNL_FAMILY_IPMR, RTM_DELROUTE,
3153 ipmr_rtm_route, NULL, 0);
3154
3155 rtnl_register(RTNL_FAMILY_IPMR, RTM_GETLINK,
3156 NULL, ipmr_rtm_dumplink, 0);
3157 return 0;
3158
3159#ifdef CONFIG_IP_PIMSM_V2
3160add_proto_fail:
3161 unregister_netdevice_notifier(&ip_mr_notifier);
3162#endif
3163reg_notif_fail:
3164 unregister_pernet_subsys(&ipmr_net_ops);
3165reg_pernet_fail:
3166 kmem_cache_destroy(mrt_cachep);
3167 return err;
3168}