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