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Merge tag 'trace-v6.2-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/trace...
[linux-block.git] / net / ipv4 / ipmr.c
CommitLineData
2874c5fd 1// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4
LT		 2/*
3 * IP multicast routing support for mrouted 3.6/3.8
4 *
113aa838 5 * (c) 1995 Alan Cox, <alan@lxorguk.ukuu.org.uk>
1da177e4
LT		 6 * Linux Consultancy and Custom Driver Development
7 *
1da177e4
LT		 8 * Fixes:
9 * Michael Chastain : Incorrect size of copying.
10 * Alan Cox : Added the cache manager code
11 * Alan Cox : Fixed the clone/copy bug and device race.
12 * Mike McLagan : Routing by source
13 * Malcolm Beattie : Buffer handling fixes.
14 * Alexey Kuznetsov : Double buffer free and other fixes.
15 * SVR Anand : Fixed several multicast bugs and problems.
16 * Alexey Kuznetsov : Status, optimisations and more.
17 * Brad Parker : Better behaviour on mrouted upcall
18 * overflow.
19 * Carlos Picoto : PIMv1 Support
20 * Pavlin Ivanov Radoslavov: PIMv2 Registers must checksum only PIM header
f77f13e2 21 * Relax this requirement to work with older peers.
1da177e4
LT		 22 */
23
7c0f6ba6 24#include <linux/uaccess.h>
1da177e4 25#include <linux/types.h>
08009a76 26#include <linux/cache.h>
4fc268d2 27#include <linux/capability.h>
1da177e4 28#include <linux/errno.h>
1da177e4
LT		 29#include <linux/mm.h>
30#include <linux/kernel.h>
31#include <linux/fcntl.h>
32#include <linux/stat.h>
33#include <linux/socket.h>
34#include <linux/in.h>
35#include <linux/inet.h>
36#include <linux/netdevice.h>
37#include <linux/inetdevice.h>
38#include <linux/igmp.h>
39#include <linux/proc_fs.h>
40#include <linux/seq_file.h>
41#include <linux/mroute.h>
42#include <linux/init.h>
46f25dff 43#include <linux/if_ether.h>
5a0e3ad6 44#include <linux/slab.h>
457c4cbc 45#include <net/net_namespace.h>
1da177e4
LT		 46#include <net/ip.h>
47#include <net/protocol.h>
48#include <linux/skbuff.h>
14c85021 49#include <net/route.h>
1da177e4
LT		 50#include <net/icmp.h>
51#include <net/udp.h>
52#include <net/raw.h>
53#include <linux/notifier.h>
54#include <linux/if_arp.h>
55#include <linux/netfilter_ipv4.h>
709b46e8 56#include <linux/compat.h>
bc3b2d7f 57#include <linux/export.h>
0eb71a9d 58#include <linux/rhashtable.h>
c5441932 59#include <net/ip_tunnels.h>
1da177e4 60#include <net/checksum.h>
dc5fc579 61#include <net/netlink.h>
f0ad0860 62#include <net/fib_rules.h>
d67b8c61 63#include <linux/netconf.h>
3c618c1d 64#include <net/rtnh.h>
1da177e4 65
5648451e
GS		 66#include <linux/nospec.h>
67
f0ad0860
PM		 68struct ipmr_rule {
69 struct fib_rule common;
70};
71
72struct ipmr_result {
73 struct mr_table *mrt;
74};
75
1da177e4 76/* Big lock, protecting vif table, mrt cache and mroute socket state.
a8cb16dd 77 * Note that the changes are semaphored via rtnl_lock.
1da177e4
LT		 78 */
79
3f55211e 80static DEFINE_SPINLOCK(mrt_lock);
1da177e4 81
ebc31979
ED		 82static struct net_device *vif_dev_read(const struct vif_device *vif)
83{
3f55211e 84 return rcu_dereference(vif->dev);
ebc31979
ED		 85}
86
7ef8f65d 87/* Multicast router control variables */
1da177e4 88
1da177e4
LT		 89/* Special spinlock for queue of unresolved entries */
90static DEFINE_SPINLOCK(mfc_unres_lock);
91
92/* We return to original Alan's scheme. Hash table of resolved
a8cb16dd
ED		 93 * entries is changed only in process context and protected
94 * with weak lock mrt_lock. Queue of unresolved entries is protected
95 * with strong spinlock mfc_unres_lock.
96 *
97 * In this case data path is free of exclusive locks at all.
1da177e4
LT		 98 */
99
08009a76 100static struct kmem_cache *mrt_cachep __ro_after_init;
1da177e4 101
f0ad0860 102static struct mr_table *ipmr_new_table(struct net *net, u32 id);
acbb219d
FR		 103static void ipmr_free_table(struct mr_table *mrt);
104
c4854ec8 105static void ip_mr_forward(struct net *net, struct mr_table *mrt,
4b1f0d33
DS		 106 struct net_device *dev, struct sk_buff *skb,
107 struct mfc_cache *cache, int local);
64667988 108static int ipmr_cache_report(const struct mr_table *mrt,
4feb88e5 109 struct sk_buff *pkt, vifi_t vifi, int assert);
8cd3ac9f
ND		 110static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
111 int cmd);
0b490b51 112static void igmpmsg_netlink_event(const struct mr_table *mrt, struct sk_buff *pkt);
ca8d4794 113static void mroute_clean_tables(struct mr_table *mrt, int flags);
e99e88a9 114static void ipmr_expire_process(struct timer_list *t);
f0ad0860
PM		 115
116#ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
7013908c
AG		 117#define ipmr_for_each_table(mrt, net) \
118 list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list, \
119 lockdep_rtnl_is_held() || \
120 list_empty(&net->ipv4.mr_tables))
f0ad0860 121
7b0db857
YM		 122static struct mr_table *ipmr_mr_table_iter(struct net *net,
123 struct mr_table *mrt)
124{
125 struct mr_table *ret;
126
127 if (!mrt)
128 ret = list_entry_rcu(net->ipv4.mr_tables.next,
129 struct mr_table, list);
130 else
131 ret = list_entry_rcu(mrt->list.next,
132 struct mr_table, list);
133
134 if (&ret->list == &net->ipv4.mr_tables)
135 return NULL;
136 return ret;
137}
138
f0ad0860
PM		 139static struct mr_table *ipmr_get_table(struct net *net, u32 id)
140{
141 struct mr_table *mrt;
142
143 ipmr_for_each_table(mrt, net) {
144 if (mrt->id == id)
145 return mrt;
146 }
147 return NULL;
148}
149
da91981b 150static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4,
f0ad0860
PM		 151 struct mr_table **mrt)
152{
f0ad0860 153 int err;
95f4a45d
HFS		 154 struct ipmr_result res;
155 struct fib_lookup_arg arg = {
156 .result = &res,
157 .flags = FIB_LOOKUP_NOREF,
158 };
f0ad0860 159
e58e4159
DA		 160 /* update flow if oif or iif point to device enslaved to l3mdev */
161 l3mdev_update_flow(net, flowi4_to_flowi(flp4));
162
da91981b
DM		 163 err = fib_rules_lookup(net->ipv4.mr_rules_ops,
164 flowi4_to_flowi(flp4), 0, &arg);
f0ad0860
PM		 165 if (err < 0)
166 return err;
167 *mrt = res.mrt;
168 return 0;
169}
170
171static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp,
172 int flags, struct fib_lookup_arg *arg)
173{
174 struct ipmr_result *res = arg->result;
175 struct mr_table *mrt;
1da177e4 176
f0ad0860
PM		 177 switch (rule->action) {
178 case FR_ACT_TO_TBL:
179 break;
180 case FR_ACT_UNREACHABLE:
181 return -ENETUNREACH;
182 case FR_ACT_PROHIBIT:
183 return -EACCES;
184 case FR_ACT_BLACKHOLE:
185 default:
186 return -EINVAL;
187 }
188
e58e4159
DA		 189 arg->table = fib_rule_get_table(rule, arg);
190
191 mrt = ipmr_get_table(rule->fr_net, arg->table);
51456b29 192 if (!mrt)
f0ad0860
PM		 193 return -EAGAIN;
194 res->mrt = mrt;
195 return 0;
196}
197
198static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
199{
200 return 1;
201}
202
f0ad0860 203static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
b16fb418
RP		 204 struct fib_rule_hdr *frh, struct nlattr **tb,
205 struct netlink_ext_ack *extack)
f0ad0860
PM		 206{
207 return 0;
208}
209
210static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
211 struct nlattr **tb)
212{
213 return 1;
214}
215
216static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
217 struct fib_rule_hdr *frh)
218{
219 frh->dst_len = 0;
220 frh->src_len = 0;
221 frh->tos = 0;
222 return 0;
223}
224
04a6f82c 225static const struct fib_rules_ops __net_initconst ipmr_rules_ops_template = {
25239cee 226 .family = RTNL_FAMILY_IPMR,
f0ad0860
PM		 227 .rule_size = sizeof(struct ipmr_rule),
228 .addr_size = sizeof(u32),
229 .action = ipmr_rule_action,
230 .match = ipmr_rule_match,
231 .configure = ipmr_rule_configure,
232 .compare = ipmr_rule_compare,
f0ad0860
PM		 233 .fill = ipmr_rule_fill,
234 .nlgroup = RTNLGRP_IPV4_RULE,
f0ad0860
PM		 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);
1113ebbc
NA		 251 if (IS_ERR(mrt)) {
252 err = PTR_ERR(mrt);
f0ad0860
PM		 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:
5611a006 264 rtnl_lock();
f243e5a7 265 ipmr_free_table(mrt);
5611a006 266 rtnl_unlock();
f0ad0860
PM		 267err1:
268 fib_rules_unregister(ops);
269 return err;
270}
271
272static void __net_exit ipmr_rules_exit(struct net *net)
273{
274 struct mr_table *mrt, *next;
275
696e595f 276 ASSERT_RTNL();
035320d5
ED		 277 list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) {
278 list_del(&mrt->list);
acbb219d 279 ipmr_free_table(mrt);
035320d5 280 }
f0ad0860
PM		 281 fib_rules_unregister(net->ipv4.mr_rules_ops);
282}
4d65b948 283
b7a59557
JP		 284static int ipmr_rules_dump(struct net *net, struct notifier_block *nb,
285 struct netlink_ext_ack *extack)
4d65b948 286{
b7a59557 287 return fib_rules_dump(net, nb, RTNL_FAMILY_IPMR, extack);
4d65b948
YG		 288}
289
290static unsigned int ipmr_rules_seq_read(struct net *net)
291{
292 return fib_rules_seq_read(net, RTNL_FAMILY_IPMR);
293}
478e4c2f
YG		 294
295bool ipmr_rule_default(const struct fib_rule *rule)
296{
297 return fib_rule_matchall(rule) && rule->table == RT_TABLE_DEFAULT;
298}
299EXPORT_SYMBOL(ipmr_rule_default);
f0ad0860
PM		 300#else
301#define ipmr_for_each_table(mrt, net) \
302 for (mrt = net->ipv4.mrt; mrt; mrt = NULL)
303
7b0db857
YM		 304static struct mr_table *ipmr_mr_table_iter(struct net *net,
305 struct mr_table *mrt)
306{
307 if (!mrt)
308 return net->ipv4.mrt;
309 return NULL;
310}
311
f0ad0860
PM		 312static struct mr_table *ipmr_get_table(struct net *net, u32 id)
313{
314 return net->ipv4.mrt;
315}
316
da91981b 317static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4,
f0ad0860
PM		 318 struct mr_table **mrt)
319{
320 *mrt = net->ipv4.mrt;
321 return 0;
322}
323
324static int __net_init ipmr_rules_init(struct net *net)
325{
1113ebbc
NA		 326 struct mr_table *mrt;
327
328 mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
329 if (IS_ERR(mrt))
330 return PTR_ERR(mrt);
331 net->ipv4.mrt = mrt;
332 return 0;
f0ad0860
PM		 333}
334
335static void __net_exit ipmr_rules_exit(struct net *net)
336{
696e595f 337 ASSERT_RTNL();
acbb219d 338 ipmr_free_table(net->ipv4.mrt);
ed785309 339 net->ipv4.mrt = NULL;
f0ad0860 340}
4d65b948 341
b7a59557
JP		 342static int ipmr_rules_dump(struct net *net, struct notifier_block *nb,
343 struct netlink_ext_ack *extack)
4d65b948
YG		 344{
345 return 0;
346}
347
348static unsigned int ipmr_rules_seq_read(struct net *net)
349{
350 return 0;
351}
478e4c2f
YG		 352
353bool ipmr_rule_default(const struct fib_rule *rule)
354{
355 return true;
356}
357EXPORT_SYMBOL(ipmr_rule_default);
f0ad0860
PM		 358#endif
359
8fb472c0
NA		 360static inline int ipmr_hash_cmp(struct rhashtable_compare_arg *arg,
361 const void *ptr)
362{
363 const struct mfc_cache_cmp_arg *cmparg = arg->key;
2e47eece 364 const struct mfc_cache *c = ptr;
8fb472c0
NA		 365
366 return cmparg->mfc_mcastgrp != c->mfc_mcastgrp ||
367 cmparg->mfc_origin != c->mfc_origin;
368}
369
370static const struct rhashtable_params ipmr_rht_params = {
494fff56 371 .head_offset = offsetof(struct mr_mfc, mnode),
8fb472c0
NA		 372 .key_offset = offsetof(struct mfc_cache, cmparg),
373 .key_len = sizeof(struct mfc_cache_cmp_arg),
374 .nelem_hint = 3,
8fb472c0
NA		 375 .obj_cmpfn = ipmr_hash_cmp,
376 .automatic_shrinking = true,
377};
378
0bbbf0e7
YM		 379static void ipmr_new_table_set(struct mr_table *mrt,
380 struct net *net)
381{
382#ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
383 list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables);
384#endif
385}
386
845c9a7a
YM		 387static struct mfc_cache_cmp_arg ipmr_mr_table_ops_cmparg_any = {
388 .mfc_mcastgrp = htonl(INADDR_ANY),
389 .mfc_origin = htonl(INADDR_ANY),
390};
391
392static struct mr_table_ops ipmr_mr_table_ops = {
393 .rht_params = &ipmr_rht_params,
394 .cmparg_any = &ipmr_mr_table_ops_cmparg_any,
395};
396
f0ad0860
PM		 397static struct mr_table *ipmr_new_table(struct net *net, u32 id)
398{
399 struct mr_table *mrt;
1da177e4 400
1113ebbc
NA		 401 /* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */
402 if (id != RT_TABLE_DEFAULT && id >= 1000000000)
403 return ERR_PTR(-EINVAL);
404
f0ad0860 405 mrt = ipmr_get_table(net, id);
00db4124 406 if (mrt)
f0ad0860
PM		 407 return mrt;
408
845c9a7a 409 return mr_table_alloc(net, id, &ipmr_mr_table_ops,
0bbbf0e7 410 ipmr_expire_process, ipmr_new_table_set);
f0ad0860 411}
1da177e4 412
acbb219d
FR		 413static void ipmr_free_table(struct mr_table *mrt)
414{
292a089d 415 timer_shutdown_sync(&mrt->ipmr_expire_timer);
ca8d4794
CS		 416 mroute_clean_tables(mrt, MRT_FLUSH_VIFS | MRT_FLUSH_VIFS_STATIC |
417 MRT_FLUSH_MFC | MRT_FLUSH_MFC_STATIC);
8fb472c0 418 rhltable_destroy(&mrt->mfc_hash);
acbb219d
FR		 419 kfree(mrt);
420}
421
1da177e4
LT		 422/* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */
423
a0b47736
NA		 424/* Initialize ipmr pimreg/tunnel in_device */
425static bool ipmr_init_vif_indev(const struct net_device *dev)
426{
427 struct in_device *in_dev;
428
429 ASSERT_RTNL();
430
431 in_dev = __in_dev_get_rtnl(dev);
432 if (!in_dev)
433 return false;
434 ipv4_devconf_setall(in_dev);
435 neigh_parms_data_state_setall(in_dev->arp_parms);
436 IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;
437
438 return true;
439}
440
7ef8f65d 441static struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v)
1da177e4 442{
c384b8a7
CH		 443 struct net_device *tunnel_dev, *new_dev;
444 struct ip_tunnel_parm p = { };
c384b8a7 445 int err;
1da177e4 446
c384b8a7
CH		 447 tunnel_dev = __dev_get_by_name(net, "tunl0");
448 if (!tunnel_dev)
449 goto out;
450
451 p.iph.daddr = v->vifc_rmt_addr.s_addr;
452 p.iph.saddr = v->vifc_lcl_addr.s_addr;
453 p.iph.version = 4;
454 p.iph.ihl = 5;
455 p.iph.protocol = IPPROTO_IPIP;
456 sprintf(p.name, "dvmrp%d", v->vifc_vifi);
c384b8a7 457
c7e36705 458 if (!tunnel_dev->netdev_ops->ndo_tunnel_ctl)
c384b8a7 459 goto out;
c7e36705 460 err = tunnel_dev->netdev_ops->ndo_tunnel_ctl(tunnel_dev, &p,
c384b8a7 461 SIOCADDTUNNEL);
c384b8a7
CH		 462 if (err)
463 goto out;
464
465 new_dev = __dev_get_by_name(net, p.name);
466 if (!new_dev)
467 goto out;
468
469 new_dev->flags |= IFF_MULTICAST;
470 if (!ipmr_init_vif_indev(new_dev))
471 goto out_unregister;
472 if (dev_open(new_dev, NULL))
473 goto out_unregister;
474 dev_hold(new_dev);
c1fd1182
CH		 475 err = dev_set_allmulti(new_dev, 1);
476 if (err) {
477 dev_close(new_dev);
c7e36705 478 tunnel_dev->netdev_ops->ndo_tunnel_ctl(tunnel_dev, &p,
c1fd1182 479 SIOCDELTUNNEL);
c1fd1182
CH		 480 dev_put(new_dev);
481 new_dev = ERR_PTR(err);
482 }
c384b8a7
CH		 483 return new_dev;
484
485out_unregister:
486 unregister_netdevice(new_dev);
487out:
c1fd1182 488 return ERR_PTR(-ENOBUFS);
1da177e4
LT		 489}
490
c316c629 491#if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2)
6fef4c0c 492static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev)
1da177e4 493{
4feb88e5 494 struct net *net = dev_net(dev);
f0ad0860 495 struct mr_table *mrt;
da91981b
DM		 496 struct flowi4 fl4 = {
497 .flowi4_oif = dev->ifindex,
6a662719 498 .flowi4_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
da91981b 499 .flowi4_mark = skb->mark,
f0ad0860
PM		 500 };
501 int err;
502
da91981b 503 err = ipmr_fib_lookup(net, &fl4, &mrt);
e40dbc51
BG		 504 if (err < 0) {
505 kfree_skb(skb);
f0ad0860 506 return err;
e40dbc51 507 }
4feb88e5 508
c4794d22
ED		 509 DEV_STATS_ADD(dev, tx_bytes, skb->len);
510 DEV_STATS_INC(dev, tx_packets);
64667988
ED		 511 rcu_read_lock();
512
513 /* Pairs with WRITE_ONCE() in vif_add() and vif_delete() */
514 ipmr_cache_report(mrt, skb, READ_ONCE(mrt->mroute_reg_vif_num),
515 IGMPMSG_WHOLEPKT);
516
517 rcu_read_unlock();
1da177e4 518 kfree_skb(skb);
6ed10654 519 return NETDEV_TX_OK;
1da177e4
LT		 520}
521
ee9b9596
ND		 522static int reg_vif_get_iflink(const struct net_device *dev)
523{
524 return 0;
525}
526
007c3838
SH		 527static const struct net_device_ops reg_vif_netdev_ops = {
528 .ndo_start_xmit = reg_vif_xmit,
ee9b9596 529 .ndo_get_iflink = reg_vif_get_iflink,
007c3838
SH		 530};
531
1da177e4
LT		 532static void reg_vif_setup(struct net_device *dev)
533{
534 dev->type = ARPHRD_PIMREG;
46f25dff 535 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8;
1da177e4 536 dev->flags = IFF_NOARP;
70cb4a45 537 dev->netdev_ops = &reg_vif_netdev_ops;
cf124db5 538 dev->needs_free_netdev = true;
403dbb97 539 dev->features |= NETIF_F_NETNS_LOCAL;
1da177e4
LT		 540}
541
f0ad0860 542static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
1da177e4
LT		 543{
544 struct net_device *dev;
f0ad0860 545 char name[IFNAMSIZ];
1da177e4 546
f0ad0860
PM		 547 if (mrt->id == RT_TABLE_DEFAULT)
548 sprintf(name, "pimreg");
549 else
550 sprintf(name, "pimreg%u", mrt->id);
1da177e4 551
c835a677 552 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup);
1da177e4 553
51456b29 554 if (!dev)
1da177e4
LT		 555 return NULL;
556
403dbb97
TG		 557 dev_net_set(dev, net);
558
1da177e4
LT		 559 if (register_netdevice(dev)) {
560 free_netdev(dev);
561 return NULL;
562 }
1da177e4 563
a0b47736 564 if (!ipmr_init_vif_indev(dev))
1da177e4 565 goto failure;
00f54e68 566 if (dev_open(dev, NULL))
1da177e4
LT		 567 goto failure;
568
7dc00c82
WC		 569 dev_hold(dev);
570
1da177e4
LT		 571 return dev;
572
573failure:
1da177e4
LT		 574 unregister_netdevice(dev);
575 return NULL;
576}
c316c629
NA		 577
578/* called with rcu_read_lock() */
579static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb,
580 unsigned int pimlen)
581{
582 struct net_device *reg_dev = NULL;
583 struct iphdr *encap;
121fefc6 584 int vif_num;
c316c629
NA		 585
586 encap = (struct iphdr *)(skb_transport_header(skb) + pimlen);
7ef8f65d 587 /* Check that:
c316c629
NA		 588 * a. packet is really sent to a multicast group
589 * b. packet is not a NULL-REGISTER
590 * c. packet is not truncated
591 */
592 if (!ipv4_is_multicast(encap->daddr) ||
593 encap->tot_len == 0 ||
594 ntohs(encap->tot_len) + pimlen > skb->len)
595 return 1;
596
121fefc6
ED		 597 /* Pairs with WRITE_ONCE() in vif_add()/vid_delete() */
598 vif_num = READ_ONCE(mrt->mroute_reg_vif_num);
599 if (vif_num >= 0)
600 reg_dev = vif_dev_read(&mrt->vif_table[vif_num]);
c316c629
NA		 601 if (!reg_dev)
602 return 1;
603
604 skb->mac_header = skb->network_header;
605 skb_pull(skb, (u8 *)encap - skb->data);
606 skb_reset_network_header(skb);
607 skb->protocol = htons(ETH_P_IP);
608 skb->ip_summed = CHECKSUM_NONE;
609
610 skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
611
612 netif_rx(skb);
613
614 return NET_RX_SUCCESS;
615}
616#else
617static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
618{
619 return NULL;
620}
1da177e4
LT		 621#endif
622
b362053a
YG		 623static int call_ipmr_vif_entry_notifiers(struct net *net,
624 enum fib_event_type event_type,
625 struct vif_device *vif,
ebc31979 626 struct net_device *vif_dev,
b362053a
YG		 627 vifi_t vif_index, u32 tb_id)
628{
bc67a0da 629 return mr_call_vif_notifiers(net, RTNL_FAMILY_IPMR, event_type,
ebc31979 630 vif, vif_dev, vif_index, tb_id,
bc67a0da 631 &net->ipv4.ipmr_seq);
b362053a
YG		 632}
633
b362053a
YG		 634static int call_ipmr_mfc_entry_notifiers(struct net *net,
635 enum fib_event_type event_type,
636 struct mfc_cache *mfc, u32 tb_id)
637{
54c4cad9
YM		 638 return mr_call_mfc_notifiers(net, RTNL_FAMILY_IPMR, event_type,
639 &mfc->_c, tb_id, &net->ipv4.ipmr_seq);
b362053a
YG		 640}
641
2c53040f
BH		 642/**
643 * vif_delete - Delete a VIF entry
3628e3cb
AL		 644 * @mrt: Table to delete from
645 * @vifi: VIF identifier to delete
7dc00c82 646 * @notify: Set to 1, if the caller is a notifier_call
3628e3cb 647 * @head: if unregistering the VIF, place it on this queue
1da177e4 648 */
0c12295a 649static int vif_delete(struct mr_table *mrt, int vifi, int notify,
d17fa6fa 650 struct list_head *head)
1da177e4 651{
b362053a 652 struct net *net = read_pnet(&mrt->net);
1da177e4
LT		 653 struct vif_device *v;
654 struct net_device *dev;
655 struct in_device *in_dev;
656
0c12295a 657 if (vifi < 0 || vifi >= mrt->maxvif)
1da177e4
LT		 658 return -EADDRNOTAVAIL;
659
0c12295a 660 v = &mrt->vif_table[vifi];
1da177e4 661
ebc31979
ED		 662 dev = rtnl_dereference(v->dev);
663 if (!dev)
664 return -EADDRNOTAVAIL;
b362053a 665
3f55211e 666 spin_lock(&mrt_lock);
ebc31979
ED		 667 call_ipmr_vif_entry_notifiers(net, FIB_EVENT_VIF_DEL, v, dev,
668 vifi, mrt->id);
669 RCU_INIT_POINTER(v->dev, NULL);
1da177e4 670
64667988
ED		 671 if (vifi == mrt->mroute_reg_vif_num) {
672 /* Pairs with READ_ONCE() in ipmr_cache_report() and reg_vif_xmit() */
673 WRITE_ONCE(mrt->mroute_reg_vif_num, -1);
674 }
a8cb16dd 675 if (vifi + 1 == mrt->maxvif) {
1da177e4 676 int tmp;
a8cb16dd
ED		 677
678 for (tmp = vifi - 1; tmp >= 0; tmp--) {
0c12295a 679 if (VIF_EXISTS(mrt, tmp))
1da177e4
LT		 680 break;
681 }
9094db4b 682 WRITE_ONCE(mrt->maxvif, tmp + 1);
1da177e4
LT		 683 }
684
3f55211e 685 spin_unlock(&mrt_lock);
1da177e4
LT		 686
687 dev_set_allmulti(dev, -1);
688
a8cb16dd
ED		 689 in_dev = __in_dev_get_rtnl(dev);
690 if (in_dev) {
42f811b8 691 IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--;
3b022865 692 inet_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
d67b8c61
ND		 693 NETCONFA_MC_FORWARDING,
694 dev->ifindex, &in_dev->cnf);
1da177e4
LT		 695 ip_rt_multicast_event(in_dev);
696 }
697
a8cb16dd 698 if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify)
d17fa6fa 699 unregister_netdevice_queue(dev, head);
1da177e4 700
d62607c3 701 netdev_put(dev, &v->dev_tracker);
1da177e4
LT		 702 return 0;
703}
704
a8c9486b 705static void ipmr_cache_free_rcu(struct rcu_head *head)
5c0a66f5 706{
494fff56 707 struct mr_mfc *c = container_of(head, struct mr_mfc, rcu);
a8c9486b 708
494fff56 709 kmem_cache_free(mrt_cachep, (struct mfc_cache *)c);
5c0a66f5
BT		 710}
711
8c13af2a 712static void ipmr_cache_free(struct mfc_cache *c)
a8c9486b 713{
494fff56 714 call_rcu(&c->_c.rcu, ipmr_cache_free_rcu);
a8c9486b
ED		 715}
716
1da177e4 717/* Destroy an unresolved cache entry, killing queued skbs
a8cb16dd 718 * and reporting error to netlink readers.
1da177e4 719 */
0c12295a 720static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c)
1da177e4 721{
8de53dfb 722 struct net *net = read_pnet(&mrt->net);
1da177e4 723 struct sk_buff *skb;
9ef1d4c7 724 struct nlmsgerr *e;
1da177e4 725
0c12295a 726 atomic_dec(&mrt->cache_resolve_queue_len);
1da177e4 727
494fff56 728 while ((skb = skb_dequeue(&c->_c.mfc_un.unres.unresolved))) {
eddc9ec5 729 if (ip_hdr(skb)->version == 0) {
af72868b
JB		 730 struct nlmsghdr *nlh = skb_pull(skb,
731 sizeof(struct iphdr));
1da177e4 732 nlh->nlmsg_type = NLMSG_ERROR;
573ce260 733 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
1da177e4 734 skb_trim(skb, nlh->nlmsg_len);
573ce260 735 e = nlmsg_data(nlh);
9ef1d4c7
PM		 736 e->error = -ETIMEDOUT;
737 memset(&e->msg, 0, sizeof(e->msg));
2942e900 738
15e47304 739 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
a8cb16dd 740 } else {
1da177e4 741 kfree_skb(skb);
a8cb16dd 742 }
1da177e4
LT		 743 }
744
5c0a66f5 745 ipmr_cache_free(c);
1da177e4
LT		 746}
747
e258beb2 748/* Timer process for the unresolved queue. */
e99e88a9 749static void ipmr_expire_process(struct timer_list *t)
1da177e4 750{
e99e88a9 751 struct mr_table *mrt = from_timer(mrt, t, ipmr_expire_timer);
494fff56 752 struct mr_mfc *c, *next;
1da177e4 753 unsigned long expires;
494fff56 754 unsigned long now;
1da177e4
LT		 755
756 if (!spin_trylock(&mfc_unres_lock)) {
0c12295a 757 mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10);
1da177e4
LT		 758 return;
759 }
760
0c12295a 761 if (list_empty(&mrt->mfc_unres_queue))
1da177e4
LT		 762 goto out;
763
764 now = jiffies;
765 expires = 10*HZ;
1da177e4 766
0c12295a 767 list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
1da177e4
LT		 768 if (time_after(c->mfc_un.unres.expires, now)) {
769 unsigned long interval = c->mfc_un.unres.expires - now;
770 if (interval < expires)
771 expires = interval;
1da177e4
LT		 772 continue;
773 }
774
862465f2 775 list_del(&c->list);
494fff56
YM		 776 mroute_netlink_event(mrt, (struct mfc_cache *)c, RTM_DELROUTE);
777 ipmr_destroy_unres(mrt, (struct mfc_cache *)c);
1da177e4
LT		 778 }
779
0c12295a
PM		 780 if (!list_empty(&mrt->mfc_unres_queue))
781 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
1da177e4
LT		 782
783out:
784 spin_unlock(&mfc_unres_lock);
785}
786
3f55211e 787/* Fill oifs list. It is called under locked mrt_lock. */
494fff56 788static void ipmr_update_thresholds(struct mr_table *mrt, struct mr_mfc *cache,
d658f8a0 789 unsigned char *ttls)
1da177e4
LT		 790{
791 int vifi;
792
793 cache->mfc_un.res.minvif = MAXVIFS;
794 cache->mfc_un.res.maxvif = 0;
795 memset(cache->mfc_un.res.ttls, 255, MAXVIFS);
796
0c12295a
PM		 797 for (vifi = 0; vifi < mrt->maxvif; vifi++) {
798 if (VIF_EXISTS(mrt, vifi) &&
cf958ae3 799 ttls[vifi] && ttls[vifi] < 255) {
1da177e4
LT		 800 cache->mfc_un.res.ttls[vifi] = ttls[vifi];
801 if (cache->mfc_un.res.minvif > vifi)
802 cache->mfc_un.res.minvif = vifi;
803 if (cache->mfc_un.res.maxvif <= vifi)
804 cache->mfc_un.res.maxvif = vifi + 1;
805 }
806 }
90b5ca17 807 cache->mfc_un.res.lastuse = jiffies;
1da177e4
LT		 808}
809
0c12295a
PM		 810static int vif_add(struct net *net, struct mr_table *mrt,
811 struct vifctl *vifc, int mrtsock)
1da177e4 812{
bccb3025 813 struct netdev_phys_item_id ppid = { };
1da177e4 814 int vifi = vifc->vifc_vifi;
0c12295a 815 struct vif_device *v = &mrt->vif_table[vifi];
1da177e4
LT		 816 struct net_device *dev;
817 struct in_device *in_dev;
d607032d 818 int err;
1da177e4
LT		 819
820 /* Is vif busy ? */
0c12295a 821 if (VIF_EXISTS(mrt, vifi))
1da177e4
LT		 822 return -EADDRINUSE;
823
824 switch (vifc->vifc_flags) {
1da177e4 825 case VIFF_REGISTER:
1973a4ea 826 if (!ipmr_pimsm_enabled())
c316c629
NA		 827 return -EINVAL;
828 /* Special Purpose VIF in PIM
1da177e4
LT		 829 * All the packets will be sent to the daemon
830 */
0c12295a 831 if (mrt->mroute_reg_vif_num >= 0)
1da177e4 832 return -EADDRINUSE;
f0ad0860 833 dev = ipmr_reg_vif(net, mrt);
1da177e4
LT		 834 if (!dev)
835 return -ENOBUFS;
d607032d
WC		 836 err = dev_set_allmulti(dev, 1);
837 if (err) {
838 unregister_netdevice(dev);
7dc00c82 839 dev_put(dev);
d607032d
WC		 840 return err;
841 }
1da177e4 842 break;
e905a9ed 843 case VIFF_TUNNEL:
4feb88e5 844 dev = ipmr_new_tunnel(net, vifc);
c1fd1182
CH		 845 if (IS_ERR(dev))
846 return PTR_ERR(dev);
1da177e4 847 break;
ee5e81f0 848 case VIFF_USE_IFINDEX:
1da177e4 849 case 0:
ee5e81f0
I		 850 if (vifc->vifc_flags == VIFF_USE_IFINDEX) {
851 dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex);
51456b29 852 if (dev && !__in_dev_get_rtnl(dev)) {
ee5e81f0
I		 853 dev_put(dev);
854 return -EADDRNOTAVAIL;
855 }
a8cb16dd 856 } else {
ee5e81f0 857 dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr);
a8cb16dd 858 }
1da177e4
LT		 859 if (!dev)
860 return -EADDRNOTAVAIL;
d607032d 861 err = dev_set_allmulti(dev, 1);
7dc00c82
WC		 862 if (err) {
863 dev_put(dev);
d607032d 864 return err;
7dc00c82 865 }
1da177e4
LT		 866 break;
867 default:
868 return -EINVAL;
869 }
870
a8cb16dd
ED		 871 in_dev = __in_dev_get_rtnl(dev);
872 if (!in_dev) {
d0490cfd 873 dev_put(dev);
1da177e4 874 return -EADDRNOTAVAIL;
d0490cfd 875 }
42f811b8 876 IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++;
3b022865
DA		 877 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_MC_FORWARDING,
878 dev->ifindex, &in_dev->cnf);
1da177e4
LT		 879 ip_rt_multicast_event(in_dev);
880
a8cb16dd 881 /* Fill in the VIF structures */
6853f21f
YM		 882 vif_device_init(v, dev, vifc->vifc_rate_limit,
883 vifc->vifc_threshold,
884 vifc->vifc_flags | (!mrtsock ? VIFF_STATIC : 0),
885 (VIFF_TUNNEL | VIFF_REGISTER));
a8cb16dd 886
bccb3025
FF		 887 err = dev_get_port_parent_id(dev, &ppid, true);
888 if (err == 0) {
889 memcpy(v->dev_parent_id.id, ppid.id, ppid.id_len);
890 v->dev_parent_id.id_len = ppid.id_len;
5d8b3e69
YG		 891 } else {
892 v->dev_parent_id.id_len = 0;
893 }
6853f21f 894
c354e124
JK		 895 v->local = vifc->vifc_lcl_addr.s_addr;
896 v->remote = vifc->vifc_rmt_addr.s_addr;
1da177e4
LT		 897
898 /* And finish update writing critical data */
3f55211e 899 spin_lock(&mrt_lock);
ebc31979 900 rcu_assign_pointer(v->dev, dev);
42120a86 901 netdev_tracker_alloc(dev, &v->dev_tracker, GFP_ATOMIC);
64667988
ED		 902 if (v->flags & VIFF_REGISTER) {
903 /* Pairs with READ_ONCE() in ipmr_cache_report() and reg_vif_xmit() */
904 WRITE_ONCE(mrt->mroute_reg_vif_num, vifi);
905 }
0c12295a 906 if (vifi+1 > mrt->maxvif)
9094db4b 907 WRITE_ONCE(mrt->maxvif, vifi + 1);
3f55211e 908 spin_unlock(&mrt_lock);
ebc31979
ED		 909 call_ipmr_vif_entry_notifiers(net, FIB_EVENT_VIF_ADD, v, dev,
910 vifi, mrt->id);
1da177e4
LT		 911 return 0;
912}
913
a8c9486b 914/* called with rcu_read_lock() */
0c12295a 915static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt,
4feb88e5
BT		 916 __be32 origin,
917 __be32 mcastgrp)
1da177e4 918{
8fb472c0
NA		 919 struct mfc_cache_cmp_arg arg = {
920 .mfc_mcastgrp = mcastgrp,
921 .mfc_origin = origin
922 };
660b26dc 923
845c9a7a 924 return mr_mfc_find(mrt, &arg);
660b26dc
ND		 925}
926
927/* Look for a (*,G) entry */
928static struct mfc_cache *ipmr_cache_find_any(struct mr_table *mrt,
929 __be32 mcastgrp, int vifi)
930{
8fb472c0
NA		 931 struct mfc_cache_cmp_arg arg = {
932 .mfc_mcastgrp = mcastgrp,
933 .mfc_origin = htonl(INADDR_ANY)
934 };
660b26dc 935
360eb5da 936 if (mcastgrp == htonl(INADDR_ANY))
845c9a7a
YM		 937 return mr_mfc_find_any_parent(mrt, vifi);
938 return mr_mfc_find_any(mrt, vifi, &arg);
660b26dc
ND		 939}
940
8fb472c0
NA		 941/* Look for a (S,G,iif) entry if parent != -1 */
942static struct mfc_cache *ipmr_cache_find_parent(struct mr_table *mrt,
943 __be32 origin, __be32 mcastgrp,
944 int parent)
945{
946 struct mfc_cache_cmp_arg arg = {
947 .mfc_mcastgrp = mcastgrp,
948 .mfc_origin = origin,
949 };
8fb472c0 950
845c9a7a 951 return mr_mfc_find_parent(mrt, &arg, parent);
8fb472c0
NA		 952}
953
7ef8f65d 954/* Allocate a multicast cache entry */
d658f8a0 955static struct mfc_cache *ipmr_cache_alloc(void)
1da177e4 956{
c354e124 957 struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
a8c9486b 958
70a0dec4 959 if (c) {
494fff56
YM		 960 c->_c.mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1;
961 c->_c.mfc_un.res.minvif = MAXVIFS;
8c13af2a 962 c->_c.free = ipmr_cache_free_rcu;
494fff56 963 refcount_set(&c->_c.mfc_un.res.refcount, 1);
70a0dec4 964 }
1da177e4
LT		 965 return c;
966}
967
d658f8a0 968static struct mfc_cache *ipmr_cache_alloc_unres(void)
1da177e4 969{
c354e124 970 struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
a8c9486b
ED		 971
972 if (c) {
494fff56
YM		 973 skb_queue_head_init(&c->_c.mfc_un.unres.unresolved);
974 c->_c.mfc_un.unres.expires = jiffies + 10 * HZ;
a8c9486b 975 }
1da177e4
LT		 976 return c;
977}
978
7ef8f65d 979/* A cache entry has gone into a resolved state from queued */
0c12295a
PM		 980static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt,
981 struct mfc_cache *uc, struct mfc_cache *c)
1da177e4
LT		 982{
983 struct sk_buff *skb;
9ef1d4c7 984 struct nlmsgerr *e;
1da177e4 985
a8cb16dd 986 /* Play the pending entries through our router */
494fff56 987 while ((skb = __skb_dequeue(&uc->_c.mfc_un.unres.unresolved))) {
eddc9ec5 988 if (ip_hdr(skb)->version == 0) {
af72868b
JB		 989 struct nlmsghdr *nlh = skb_pull(skb,
990 sizeof(struct iphdr));
1da177e4 991
7b0db857
YM		 992 if (mr_fill_mroute(mrt, skb, &c->_c,
993 nlmsg_data(nlh)) > 0) {
a8cb16dd
ED		 994 nlh->nlmsg_len = skb_tail_pointer(skb) -
995 (u8 *)nlh;
1da177e4
LT		 996 } else {
997 nlh->nlmsg_type = NLMSG_ERROR;
573ce260 998 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
1da177e4 999 skb_trim(skb, nlh->nlmsg_len);
573ce260 1000 e = nlmsg_data(nlh);
9ef1d4c7
PM		 1001 e->error = -EMSGSIZE;
1002 memset(&e->msg, 0, sizeof(e->msg));
1da177e4 1003 }
2942e900 1004
15e47304 1005 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
a8cb16dd 1006 } else {
b07a9b26 1007 rcu_read_lock();
4b1f0d33 1008 ip_mr_forward(net, mrt, skb->dev, skb, c, 0);
b07a9b26 1009 rcu_read_unlock();
a8cb16dd 1010 }
1da177e4
LT		 1011 }
1012}
1013
5a645dd8 1014/* Bounce a cache query up to mrouted and netlink.
1da177e4 1015 *
64667988 1016 * Called under rcu_read_lock().
1da177e4 1017 */
64667988 1018static int ipmr_cache_report(const struct mr_table *mrt,
4feb88e5 1019 struct sk_buff *pkt, vifi_t vifi, int assert)
1da177e4 1020{
c9bdd4b5 1021 const int ihl = ip_hdrlen(pkt);
c316c629 1022 struct sock *mroute_sk;
1da177e4
LT		 1023 struct igmphdr *igmp;
1024 struct igmpmsg *msg;
c316c629 1025 struct sk_buff *skb;
1da177e4
LT		 1026 int ret;
1027
c921c207 1028 if (assert == IGMPMSG_WHOLEPKT || assert == IGMPMSG_WRVIFWHOLE)
1da177e4
LT		 1029 skb = skb_realloc_headroom(pkt, sizeof(struct iphdr));
1030 else
1da177e4
LT		 1031 skb = alloc_skb(128, GFP_ATOMIC);
1032
132adf54 1033 if (!skb)
1da177e4
LT		 1034 return -ENOBUFS;
1035
c921c207 1036 if (assert == IGMPMSG_WHOLEPKT || assert == IGMPMSG_WRVIFWHOLE) {
1da177e4 1037 /* Ugly, but we have no choice with this interface.
a8cb16dd
ED		 1038 * Duplicate old header, fix ihl, length etc.
1039 * And all this only to mangle msg->im_msgtype and
1040 * to set msg->im_mbz to "mbz" :-)
1da177e4 1041 */
878c8145
ACM		 1042 skb_push(skb, sizeof(struct iphdr));
1043 skb_reset_network_header(skb);
badff6d0 1044 skb_reset_transport_header(skb);
0272ffc4 1045 msg = (struct igmpmsg *)skb_network_header(skb);
d56f90a7 1046 memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr));
c921c207 1047 msg->im_msgtype = assert;
1da177e4 1048 msg->im_mbz = 0;
c8715a8e 1049 if (assert == IGMPMSG_WRVIFWHOLE) {
c921c207 1050 msg->im_vif = vifi;
c8715a8e
PD		 1051 msg->im_vif_hi = vifi >> 8;
1052 } else {
64667988
ED		 1053 /* Pairs with WRITE_ONCE() in vif_add() and vif_delete() */
1054 int vif_num = READ_ONCE(mrt->mroute_reg_vif_num);
1055
1056 msg->im_vif = vif_num;
1057 msg->im_vif_hi = vif_num >> 8;
c8715a8e 1058 }
eddc9ec5
ACM		 1059 ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2;
1060 ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) +
1061 sizeof(struct iphdr));
c316c629
NA		 1062 } else {
1063 /* Copy the IP header */
1064 skb_set_network_header(skb, skb->len);
1065 skb_put(skb, ihl);
1066 skb_copy_to_linear_data(skb, pkt->data, ihl);
1067 /* Flag to the kernel this is a route add */
1068 ip_hdr(skb)->protocol = 0;
1069 msg = (struct igmpmsg *)skb_network_header(skb);
1070 msg->im_vif = vifi;
c8715a8e 1071 msg->im_vif_hi = vifi >> 8;
c316c629
NA		 1072 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
1073 /* Add our header */
4df864c1 1074 igmp = skb_put(skb, sizeof(struct igmphdr));
c316c629
NA		 1075 igmp->type = assert;
1076 msg->im_msgtype = assert;
1077 igmp->code = 0;
1078 ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */
1079 skb->transport_header = skb->network_header;
e905a9ed 1080 }
1da177e4 1081
4c968709 1082 mroute_sk = rcu_dereference(mrt->mroute_sk);
51456b29 1083 if (!mroute_sk) {
1da177e4
LT		 1084 kfree_skb(skb);
1085 return -EINVAL;
1086 }
1087
5a645dd8
JG		 1088 igmpmsg_netlink_event(mrt, skb);
1089
a8cb16dd 1090 /* Deliver to mrouted */
4c968709 1091 ret = sock_queue_rcv_skb(mroute_sk, skb);
64667988 1092
70a269e6 1093 if (ret < 0) {
e87cc472 1094 net_warn_ratelimited("mroute: pending queue full, dropping entries\n");
1da177e4
LT		 1095 kfree_skb(skb);
1096 }
1097
1098 return ret;
1099}
1100
7ef8f65d 1101/* Queue a packet for resolution. It gets locked cache entry! */
64667988 1102/* Called under rcu_read_lock() */
7ef8f65d 1103static int ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi,
4b1f0d33 1104 struct sk_buff *skb, struct net_device *dev)
1da177e4 1105{
8fb472c0
NA		 1106 const struct iphdr *iph = ip_hdr(skb);
1107 struct mfc_cache *c;
862465f2 1108 bool found = false;
1da177e4 1109 int err;
1da177e4
LT		 1110
1111 spin_lock_bh(&mfc_unres_lock);
494fff56 1112 list_for_each_entry(c, &mrt->mfc_unres_queue, _c.list) {
e258beb2 1113 if (c->mfc_mcastgrp == iph->daddr &&
862465f2
PM		 1114 c->mfc_origin == iph->saddr) {
1115 found = true;
1da177e4 1116 break;
862465f2 1117 }
1da177e4
LT		 1118 }
1119
862465f2 1120 if (!found) {
a8cb16dd 1121 /* Create a new entry if allowable */
0079ad8e
HL		 1122 c = ipmr_cache_alloc_unres();
1123 if (!c) {
1da177e4
LT		 1124 spin_unlock_bh(&mfc_unres_lock);
1125
1126 kfree_skb(skb);
1127 return -ENOBUFS;
1128 }
1129
a8cb16dd 1130 /* Fill in the new cache entry */
494fff56 1131 c->_c.mfc_parent = -1;
eddc9ec5
ACM		 1132 c->mfc_origin = iph->saddr;
1133 c->mfc_mcastgrp = iph->daddr;
1da177e4 1134
a8cb16dd 1135 /* Reflect first query at mrouted. */
0c12295a 1136 err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE);
494fff56 1137
4feb88e5 1138 if (err < 0) {
e905a9ed 1139 /* If the report failed throw the cache entry
1da177e4
LT		 1140 out - Brad Parker
1141 */
1142 spin_unlock_bh(&mfc_unres_lock);
1143
5c0a66f5 1144 ipmr_cache_free(c);
1da177e4
LT		 1145 kfree_skb(skb);
1146 return err;
1147 }
1148
0c12295a 1149 atomic_inc(&mrt->cache_resolve_queue_len);
494fff56 1150 list_add(&c->_c.list, &mrt->mfc_unres_queue);
8cd3ac9f 1151 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1da177e4 1152
278554bd 1153 if (atomic_read(&mrt->cache_resolve_queue_len) == 1)
494fff56
YM		 1154 mod_timer(&mrt->ipmr_expire_timer,
1155 c->_c.mfc_un.unres.expires);
1da177e4
LT		 1156 }
1157
a8cb16dd 1158 /* See if we can append the packet */
494fff56 1159 if (c->_c.mfc_un.unres.unresolved.qlen > 3) {
1da177e4
LT		 1160 kfree_skb(skb);
1161 err = -ENOBUFS;
1162 } else {
4b1f0d33
DS		 1163 if (dev) {
1164 skb->dev = dev;
1165 skb->skb_iif = dev->ifindex;
1166 }
494fff56 1167 skb_queue_tail(&c->_c.mfc_un.unres.unresolved, skb);
1da177e4
LT		 1168 err = 0;
1169 }
1170
1171 spin_unlock_bh(&mfc_unres_lock);
1172 return err;
1173}
1174
7ef8f65d 1175/* MFC cache manipulation by user space mroute daemon */
1da177e4 1176
660b26dc 1177static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent)
1da177e4 1178{
b362053a 1179 struct net *net = read_pnet(&mrt->net);
8fb472c0 1180 struct mfc_cache *c;
1da177e4 1181
8fb472c0
NA		 1182 /* The entries are added/deleted only under RTNL */
1183 rcu_read_lock();
1184 c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr,
1185 mfc->mfcc_mcastgrp.s_addr, parent);
1186 rcu_read_unlock();
1187 if (!c)
1188 return -ENOENT;
494fff56
YM		 1189 rhltable_remove(&mrt->mfc_hash, &c->_c.mnode, ipmr_rht_params);
1190 list_del_rcu(&c->_c.list);
b362053a 1191 call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, c, mrt->id);
8fb472c0 1192 mroute_netlink_event(mrt, c, RTM_DELROUTE);
8c13af2a 1193 mr_cache_put(&c->_c);
1da177e4 1194
8fb472c0 1195 return 0;
1da177e4
LT		 1196}
1197
0c12295a 1198static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
660b26dc 1199 struct mfcctl *mfc, int mrtsock, int parent)
1da177e4 1200{
862465f2 1201 struct mfc_cache *uc, *c;
494fff56 1202 struct mr_mfc *_uc;
8fb472c0
NA		 1203 bool found;
1204 int ret;
1da177e4 1205
a50436f2
PM		 1206 if (mfc->mfcc_parent >= MAXVIFS)
1207 return -ENFILE;
1208
8fb472c0
NA		 1209 /* The entries are added/deleted only under RTNL */
1210 rcu_read_lock();
1211 c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr,
1212 mfc->mfcc_mcastgrp.s_addr, parent);
1213 rcu_read_unlock();
1214 if (c) {
3f55211e 1215 spin_lock(&mrt_lock);
494fff56
YM		 1216 c->_c.mfc_parent = mfc->mfcc_parent;
1217 ipmr_update_thresholds(mrt, &c->_c, mfc->mfcc_ttls);
1da177e4 1218 if (!mrtsock)
494fff56 1219 c->_c.mfc_flags |= MFC_STATIC;
3f55211e 1220 spin_unlock(&mrt_lock);
b362053a
YG		 1221 call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE, c,
1222 mrt->id);
8cd3ac9f 1223 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1da177e4
LT		 1224 return 0;
1225 }
1226
360eb5da 1227 if (mfc->mfcc_mcastgrp.s_addr != htonl(INADDR_ANY) &&
660b26dc 1228 !ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr))
1da177e4
LT		 1229 return -EINVAL;
1230
d658f8a0 1231 c = ipmr_cache_alloc();
51456b29 1232 if (!c)
1da177e4
LT		 1233 return -ENOMEM;
1234
c354e124
JK		 1235 c->mfc_origin = mfc->mfcc_origin.s_addr;
1236 c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr;
494fff56
YM		 1237 c->_c.mfc_parent = mfc->mfcc_parent;
1238 ipmr_update_thresholds(mrt, &c->_c, mfc->mfcc_ttls);
1da177e4 1239 if (!mrtsock)
494fff56 1240 c->_c.mfc_flags |= MFC_STATIC;
1da177e4 1241
494fff56 1242 ret = rhltable_insert_key(&mrt->mfc_hash, &c->cmparg, &c->_c.mnode,
8fb472c0
NA		 1243 ipmr_rht_params);
1244 if (ret) {
1245 pr_err("ipmr: rhtable insert error %d\n", ret);
1246 ipmr_cache_free(c);
1247 return ret;
1248 }
494fff56 1249 list_add_tail_rcu(&c->_c.list, &mrt->mfc_cache_list);
7ef8f65d
NA		 1250 /* Check to see if we resolved a queued list. If so we
1251 * need to send on the frames and tidy up.
1da177e4 1252 */
b0ebb739 1253 found = false;
1da177e4 1254 spin_lock_bh(&mfc_unres_lock);
494fff56
YM		 1255 list_for_each_entry(_uc, &mrt->mfc_unres_queue, list) {
1256 uc = (struct mfc_cache *)_uc;
e258beb2 1257 if (uc->mfc_origin == c->mfc_origin &&
1da177e4 1258 uc->mfc_mcastgrp == c->mfc_mcastgrp) {
494fff56 1259 list_del(&_uc->list);
0c12295a 1260 atomic_dec(&mrt->cache_resolve_queue_len);
b0ebb739 1261 found = true;
1da177e4
LT		 1262 break;
1263 }
1264 }
0c12295a
PM		 1265 if (list_empty(&mrt->mfc_unres_queue))
1266 del_timer(&mrt->ipmr_expire_timer);
1da177e4
LT		 1267 spin_unlock_bh(&mfc_unres_lock);
1268
b0ebb739 1269 if (found) {
0c12295a 1270 ipmr_cache_resolve(net, mrt, uc, c);
5c0a66f5 1271 ipmr_cache_free(uc);
1da177e4 1272 }
b362053a 1273 call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_ADD, c, mrt->id);
8cd3ac9f 1274 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1da177e4
LT		 1275 return 0;
1276}
1277
7ef8f65d 1278/* Close the multicast socket, and clear the vif tables etc */
ca8d4794 1279static void mroute_clean_tables(struct mr_table *mrt, int flags)
1da177e4 1280{
b362053a 1281 struct net *net = read_pnet(&mrt->net);
494fff56
YM		 1282 struct mr_mfc *c, *tmp;
1283 struct mfc_cache *cache;
d17fa6fa 1284 LIST_HEAD(list);
8fb472c0 1285 int i;
e905a9ed 1286
a8cb16dd 1287 /* Shut down all active vif entries */
ca8d4794
CS		 1288 if (flags & (MRT_FLUSH_VIFS | MRT_FLUSH_VIFS_STATIC)) {
1289 for (i = 0; i < mrt->maxvif; i++) {
1290 if (((mrt->vif_table[i].flags & VIFF_STATIC) &&
1291 !(flags & MRT_FLUSH_VIFS_STATIC)) ||
1292 (!(mrt->vif_table[i].flags & VIFF_STATIC) && !(flags & MRT_FLUSH_VIFS)))
1293 continue;
1294 vif_delete(mrt, i, 0, &list);
1295 }
1296 unregister_netdevice_many(&list);
1da177e4
LT		 1297 }
1298
a8cb16dd 1299 /* Wipe the cache */
ca8d4794
CS		 1300 if (flags & (MRT_FLUSH_MFC | MRT_FLUSH_MFC_STATIC)) {
1301 list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) {
1302 if (((c->mfc_flags & MFC_STATIC) && !(flags & MRT_FLUSH_MFC_STATIC)) ||
1303 (!(c->mfc_flags & MFC_STATIC) && !(flags & MRT_FLUSH_MFC)))
1304 continue;
1305 rhltable_remove(&mrt->mfc_hash, &c->mnode, ipmr_rht_params);
1306 list_del_rcu(&c->list);
494fff56 1307 cache = (struct mfc_cache *)c;
ca8d4794
CS		 1308 call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, cache,
1309 mrt->id);
494fff56 1310 mroute_netlink_event(mrt, cache, RTM_DELROUTE);
ca8d4794
CS		 1311 mr_cache_put(c);
1312 }
1313 }
1314
1315 if (flags & MRT_FLUSH_MFC) {
1316 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1317 spin_lock_bh(&mfc_unres_lock);
1318 list_for_each_entry_safe(c, tmp, &mrt->mfc_unres_queue, list) {
1319 list_del(&c->list);
1320 cache = (struct mfc_cache *)c;
1321 mroute_netlink_event(mrt, cache, RTM_DELROUTE);
1322 ipmr_destroy_unres(mrt, cache);
1323 }
1324 spin_unlock_bh(&mfc_unres_lock);
1da177e4 1325 }
1da177e4
LT		 1326 }
1327}
1328
4c968709 1329/* called from ip_ra_control(), before an RCU grace period,
974d8f86 1330 * we don't need to call synchronize_rcu() here
4c968709 1331 */
1da177e4
LT		 1332static void mrtsock_destruct(struct sock *sk)
1333{
4feb88e5 1334 struct net *net = sock_net(sk);
f0ad0860 1335 struct mr_table *mrt;
4feb88e5 1336
128aaa98 1337 rtnl_lock();
f0ad0860 1338 ipmr_for_each_table(mrt, net) {
4c968709 1339 if (sk == rtnl_dereference(mrt->mroute_sk)) {
f0ad0860 1340 IPV4_DEVCONF_ALL(net, MC_FORWARDING)--;
3b022865
DA		 1341 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
1342 NETCONFA_MC_FORWARDING,
d67b8c61
ND		 1343 NETCONFA_IFINDEX_ALL,
1344 net->ipv4.devconf_all);
a9b3cd7f 1345 RCU_INIT_POINTER(mrt->mroute_sk, NULL);
ca8d4794 1346 mroute_clean_tables(mrt, MRT_FLUSH_VIFS | MRT_FLUSH_MFC);
f0ad0860 1347 }
1da177e4 1348 }
128aaa98 1349 rtnl_unlock();
1da177e4
LT		 1350}
1351
7ef8f65d
NA		 1352/* Socket options and virtual interface manipulation. The whole
1353 * virtual interface system is a complete heap, but unfortunately
1354 * that's how BSD mrouted happens to think. Maybe one day with a proper
1355 * MOSPF/PIM router set up we can clean this up.
1da177e4 1356 */
e905a9ed 1357
01ccb5b4 1358int ip_mroute_setsockopt(struct sock *sk, int optname, sockptr_t optval,
29e97d21 1359 unsigned int optlen)
1da177e4 1360{
4feb88e5 1361 struct net *net = sock_net(sk);
29e97d21 1362 int val, ret = 0, parent = 0;
f0ad0860 1363 struct mr_table *mrt;
29e97d21
NA		 1364 struct vifctl vif;
1365 struct mfcctl mfc;
c921c207 1366 bool do_wrvifwhole;
29e97d21 1367 u32 uval;
f0ad0860 1368
29e97d21
NA		 1369 /* There's one exception to the lock - MRT_DONE which needs to unlock */
1370 rtnl_lock();
5e1859fb 1371 if (sk->sk_type != SOCK_RAW ||
29e97d21
NA		 1372 inet_sk(sk)->inet_num != IPPROTO_IGMP) {
1373 ret = -EOPNOTSUPP;
1374 goto out_unlock;
1375 }
5e1859fb 1376
f0ad0860 1377 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
29e97d21
NA		 1378 if (!mrt) {
1379 ret = -ENOENT;
1380 goto out_unlock;
1381 }
132adf54 1382 if (optname != MRT_INIT) {
33d480ce 1383 if (sk != rcu_access_pointer(mrt->mroute_sk) &&
29e97d21
NA		 1384 !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
1385 ret = -EACCES;
1386 goto out_unlock;
1387 }
1da177e4
LT		 1388 }
1389
132adf54
SH		 1390 switch (optname) {
1391 case MRT_INIT:
42e6b89c 1392 if (optlen != sizeof(int)) {
29e97d21 1393 ret = -EINVAL;
42e6b89c
NA		 1394 break;
1395 }
1396 if (rtnl_dereference(mrt->mroute_sk)) {
29e97d21 1397 ret = -EADDRINUSE;
29e97d21 1398 break;
42e6b89c 1399 }
132adf54
SH		 1400
1401 ret = ip_ra_control(sk, 1, mrtsock_destruct);
1402 if (ret == 0) {
cf778b00 1403 rcu_assign_pointer(mrt->mroute_sk, sk);
4feb88e5 1404 IPV4_DEVCONF_ALL(net, MC_FORWARDING)++;
3b022865
DA		 1405 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
1406 NETCONFA_MC_FORWARDING,
d67b8c61
ND		 1407 NETCONFA_IFINDEX_ALL,
1408 net->ipv4.devconf_all);
132adf54 1409 }
29e97d21 1410 break;
132adf54 1411 case MRT_DONE:
29e97d21
NA		 1412 if (sk != rcu_access_pointer(mrt->mroute_sk)) {
1413 ret = -EACCES;
1414 } else {
128aaa98
KT		 1415 /* We need to unlock here because mrtsock_destruct takes
1416 * care of rtnl itself and we can't change that due to
1417 * the IP_ROUTER_ALERT setsockopt which runs without it.
1418 */
1419 rtnl_unlock();
29e97d21 1420 ret = ip_ra_control(sk, 0, NULL);
128aaa98 1421 goto out;
29e97d21
NA		 1422 }
1423 break;
132adf54
SH		 1424 case MRT_ADD_VIF:
1425 case MRT_DEL_VIF:
29e97d21
NA		 1426 if (optlen != sizeof(vif)) {
1427 ret = -EINVAL;
1428 break;
1429 }
01ccb5b4 1430 if (copy_from_sockptr(&vif, optval, sizeof(vif))) {
29e97d21
NA		 1431 ret = -EFAULT;
1432 break;
1433 }
1434 if (vif.vifc_vifi >= MAXVIFS) {
1435 ret = -ENFILE;
1436 break;
1437 }
c354e124 1438 if (optname == MRT_ADD_VIF) {
4c968709
ED		 1439 ret = vif_add(net, mrt, &vif,
1440 sk == rtnl_dereference(mrt->mroute_sk));
132adf54 1441 } else {
0c12295a 1442 ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL);
132adf54 1443 }
29e97d21 1444 break;
7ef8f65d
NA		 1445 /* Manipulate the forwarding caches. These live
1446 * in a sort of kernel/user symbiosis.
1447 */
132adf54
SH		 1448 case MRT_ADD_MFC:
1449 case MRT_DEL_MFC:
660b26dc 1450 parent = -1;
a8eceea8 1451 fallthrough;
660b26dc
ND		 1452 case MRT_ADD_MFC_PROXY:
1453 case MRT_DEL_MFC_PROXY:
29e97d21
NA		 1454 if (optlen != sizeof(mfc)) {
1455 ret = -EINVAL;
1456 break;
1457 }
73cb1193 1458 if (copy_from_sockptr(&mfc, optval, sizeof(mfc))) {
29e97d21
NA		 1459 ret = -EFAULT;
1460 break;
1461 }
660b26dc
ND		 1462 if (parent == 0)
1463 parent = mfc.mfcc_parent;
660b26dc
ND		 1464 if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY)
1465 ret = ipmr_mfc_delete(mrt, &mfc, parent);
132adf54 1466 else
4c968709 1467 ret = ipmr_mfc_add(net, mrt, &mfc,
660b26dc
ND		 1468 sk == rtnl_dereference(mrt->mroute_sk),
1469 parent);
29e97d21 1470 break;
ca8d4794
CS		 1471 case MRT_FLUSH:
1472 if (optlen != sizeof(val)) {
1473 ret = -EINVAL;
1474 break;
1475 }
01ccb5b4 1476 if (copy_from_sockptr(&val, optval, sizeof(val))) {
ca8d4794
CS		 1477 ret = -EFAULT;
1478 break;
1479 }
1480 mroute_clean_tables(mrt, val);
1481 break;
7ef8f65d 1482 /* Control PIM assert. */
132adf54 1483 case MRT_ASSERT:
29e97d21
NA		 1484 if (optlen != sizeof(val)) {
1485 ret = -EINVAL;
1486 break;
1487 }
01ccb5b4 1488 if (copy_from_sockptr(&val, optval, sizeof(val))) {
29e97d21
NA		 1489 ret = -EFAULT;
1490 break;
1491 }
1492 mrt->mroute_do_assert = val;
1493 break;
132adf54 1494 case MRT_PIM:
1973a4ea 1495 if (!ipmr_pimsm_enabled()) {
29e97d21
NA		 1496 ret = -ENOPROTOOPT;
1497 break;
1498 }
1499 if (optlen != sizeof(val)) {
1500 ret = -EINVAL;
1501 break;
1502 }
01ccb5b4 1503 if (copy_from_sockptr(&val, optval, sizeof(val))) {
29e97d21
NA		 1504 ret = -EFAULT;
1505 break;
1506 }
ba93ef74 1507
c921c207 1508 do_wrvifwhole = (val == IGMPMSG_WRVIFWHOLE);
29e97d21
NA		 1509 val = !!val;
1510 if (val != mrt->mroute_do_pim) {
1511 mrt->mroute_do_pim = val;
1512 mrt->mroute_do_assert = val;
c921c207 1513 mrt->mroute_do_wrvifwhole = do_wrvifwhole;
1da177e4 1514 }
29e97d21 1515 break;
f0ad0860 1516 case MRT_TABLE:
29e97d21
NA		 1517 if (!IS_BUILTIN(CONFIG_IP_MROUTE_MULTIPLE_TABLES)) {
1518 ret = -ENOPROTOOPT;
1519 break;
1520 }
1521 if (optlen != sizeof(uval)) {
1522 ret = -EINVAL;
1523 break;
1524 }
01ccb5b4 1525 if (copy_from_sockptr(&uval, optval, sizeof(uval))) {
29e97d21
NA		 1526 ret = -EFAULT;
1527 break;
1528 }
f0ad0860 1529
4c968709
ED		 1530 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1531 ret = -EBUSY;
1532 } else {
29e97d21 1533 mrt = ipmr_new_table(net, uval);
1113ebbc
NA		 1534 if (IS_ERR(mrt))
1535 ret = PTR_ERR(mrt);
5e1859fb 1536 else
29e97d21 1537 raw_sk(sk)->ipmr_table = uval;
4c968709 1538 }
29e97d21 1539 break;
7ef8f65d 1540 /* Spurious command, or MRT_VERSION which you cannot set. */
132adf54 1541 default:
29e97d21 1542 ret = -ENOPROTOOPT;
1da177e4 1543 }
29e97d21
NA		 1544out_unlock:
1545 rtnl_unlock();
128aaa98 1546out:
29e97d21 1547 return ret;
1da177e4
LT		 1548}
1549
7ef8f65d 1550/* Getsock opt support for the multicast routing system. */
728f064c
MKL		 1551int ip_mroute_getsockopt(struct sock *sk, int optname, sockptr_t optval,
1552 sockptr_t optlen)
1da177e4
LT		 1553{
1554 int olr;
1555 int val;
4feb88e5 1556 struct net *net = sock_net(sk);
f0ad0860
PM		 1557 struct mr_table *mrt;
1558
5e1859fb
ED		 1559 if (sk->sk_type != SOCK_RAW ||
1560 inet_sk(sk)->inet_num != IPPROTO_IGMP)
1561 return -EOPNOTSUPP;
1562
f0ad0860 1563 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
51456b29 1564 if (!mrt)
f0ad0860 1565 return -ENOENT;
1da177e4 1566
fe9ef3ce
NA		 1567 switch (optname) {
1568 case MRT_VERSION:
1569 val = 0x0305;
1570 break;
1571 case MRT_PIM:
1973a4ea 1572 if (!ipmr_pimsm_enabled())
fe9ef3ce
NA		 1573 return -ENOPROTOOPT;
1574 val = mrt->mroute_do_pim;
1575 break;
1576 case MRT_ASSERT:
1577 val = mrt->mroute_do_assert;
1578 break;
1579 default:
1da177e4 1580 return -ENOPROTOOPT;
fe9ef3ce 1581 }
1da177e4 1582
728f064c 1583 if (copy_from_sockptr(&olr, optlen, sizeof(int)))
1da177e4 1584 return -EFAULT;
1da177e4
LT		 1585 olr = min_t(unsigned int, olr, sizeof(int));
1586 if (olr < 0)
1587 return -EINVAL;
728f064c 1588 if (copy_to_sockptr(optlen, &olr, sizeof(int)))
1da177e4 1589 return -EFAULT;
728f064c 1590 if (copy_to_sockptr(optval, &val, olr))
1da177e4
LT		 1591 return -EFAULT;
1592 return 0;
1593}
1594
7ef8f65d 1595/* The IP multicast ioctl support routines. */
1da177e4
LT		 1596int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg)
1597{
1598 struct sioc_sg_req sr;
1599 struct sioc_vif_req vr;
1600 struct vif_device *vif;
1601 struct mfc_cache *c;
4feb88e5 1602 struct net *net = sock_net(sk);
f0ad0860
PM		 1603 struct mr_table *mrt;
1604
1605 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
51456b29 1606 if (!mrt)
f0ad0860 1607 return -ENOENT;
e905a9ed 1608
132adf54
SH		 1609 switch (cmd) {
1610 case SIOCGETVIFCNT:
c354e124 1611 if (copy_from_user(&vr, arg, sizeof(vr)))
132adf54 1612 return -EFAULT;
0c12295a 1613 if (vr.vifi >= mrt->maxvif)
132adf54 1614 return -EINVAL;
5648451e 1615 vr.vifi = array_index_nospec(vr.vifi, mrt->maxvif);
559260fd 1616 rcu_read_lock();
0c12295a
PM		 1617 vif = &mrt->vif_table[vr.vifi];
1618 if (VIF_EXISTS(mrt, vr.vifi)) {
559260fd
ED		 1619 vr.icount = READ_ONCE(vif->pkt_in);
1620 vr.ocount = READ_ONCE(vif->pkt_out);
1621 vr.ibytes = READ_ONCE(vif->bytes_in);
1622 vr.obytes = READ_ONCE(vif->bytes_out);
1623 rcu_read_unlock();
1da177e4 1624
c354e124 1625 if (copy_to_user(arg, &vr, sizeof(vr)))
132adf54
SH		 1626 return -EFAULT;
1627 return 0;
1628 }
559260fd 1629 rcu_read_unlock();
132adf54
SH		 1630 return -EADDRNOTAVAIL;
1631 case SIOCGETSGCNT:
c354e124 1632 if (copy_from_user(&sr, arg, sizeof(sr)))
132adf54
SH		 1633 return -EFAULT;
1634
a8c9486b 1635 rcu_read_lock();
0c12295a 1636 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
132adf54 1637 if (c) {
494fff56
YM		 1638 sr.pktcnt = c->_c.mfc_un.res.pkt;
1639 sr.bytecnt = c->_c.mfc_un.res.bytes;
1640 sr.wrong_if = c->_c.mfc_un.res.wrong_if;
a8c9486b 1641 rcu_read_unlock();
132adf54 1642
c354e124 1643 if (copy_to_user(arg, &sr, sizeof(sr)))
132adf54
SH		 1644 return -EFAULT;
1645 return 0;
1646 }
a8c9486b 1647 rcu_read_unlock();
132adf54
SH		 1648 return -EADDRNOTAVAIL;
1649 default:
1650 return -ENOIOCTLCMD;
1da177e4
LT		 1651 }
1652}
1653
709b46e8
EB		 1654#ifdef CONFIG_COMPAT
1655struct compat_sioc_sg_req {
1656 struct in_addr src;
1657 struct in_addr grp;
1658 compat_ulong_t pktcnt;
1659 compat_ulong_t bytecnt;
1660 compat_ulong_t wrong_if;
1661};
1662
ca6b8bb0
DM		 1663struct compat_sioc_vif_req {
1664 vifi_t vifi; /* Which iface */
1665 compat_ulong_t icount;
1666 compat_ulong_t ocount;
1667 compat_ulong_t ibytes;
1668 compat_ulong_t obytes;
1669};
1670
709b46e8
EB		 1671int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1672{
0033d5ad 1673 struct compat_sioc_sg_req sr;
ca6b8bb0
DM		 1674 struct compat_sioc_vif_req vr;
1675 struct vif_device *vif;
709b46e8
EB		 1676 struct mfc_cache *c;
1677 struct net *net = sock_net(sk);
1678 struct mr_table *mrt;
1679
1680 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
51456b29 1681 if (!mrt)
709b46e8
EB		 1682 return -ENOENT;
1683
1684 switch (cmd) {
ca6b8bb0
DM		 1685 case SIOCGETVIFCNT:
1686 if (copy_from_user(&vr, arg, sizeof(vr)))
1687 return -EFAULT;
1688 if (vr.vifi >= mrt->maxvif)
1689 return -EINVAL;
5648451e 1690 vr.vifi = array_index_nospec(vr.vifi, mrt->maxvif);
559260fd 1691 rcu_read_lock();
ca6b8bb0
DM		 1692 vif = &mrt->vif_table[vr.vifi];
1693 if (VIF_EXISTS(mrt, vr.vifi)) {
559260fd
ED		 1694 vr.icount = READ_ONCE(vif->pkt_in);
1695 vr.ocount = READ_ONCE(vif->pkt_out);
1696 vr.ibytes = READ_ONCE(vif->bytes_in);
1697 vr.obytes = READ_ONCE(vif->bytes_out);
1698 rcu_read_unlock();
ca6b8bb0
DM		 1699
1700 if (copy_to_user(arg, &vr, sizeof(vr)))
1701 return -EFAULT;
1702 return 0;
1703 }
559260fd 1704 rcu_read_unlock();
ca6b8bb0 1705 return -EADDRNOTAVAIL;
709b46e8
EB		 1706 case SIOCGETSGCNT:
1707 if (copy_from_user(&sr, arg, sizeof(sr)))
1708 return -EFAULT;
1709
1710 rcu_read_lock();
1711 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
1712 if (c) {
494fff56
YM		 1713 sr.pktcnt = c->_c.mfc_un.res.pkt;
1714 sr.bytecnt = c->_c.mfc_un.res.bytes;
1715 sr.wrong_if = c->_c.mfc_un.res.wrong_if;
709b46e8
EB		 1716 rcu_read_unlock();
1717
1718 if (copy_to_user(arg, &sr, sizeof(sr)))
1719 return -EFAULT;
1720 return 0;
1721 }
1722 rcu_read_unlock();
1723 return -EADDRNOTAVAIL;
1724 default:
1725 return -ENOIOCTLCMD;
1726 }
1727}
1728#endif
1729
1da177e4
LT		 1730static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
1731{
351638e7 1732 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4feb88e5 1733 struct net *net = dev_net(dev);
f0ad0860 1734 struct mr_table *mrt;
1da177e4
LT		 1735 struct vif_device *v;
1736 int ct;
e9dc8653 1737
1da177e4
LT		 1738 if (event != NETDEV_UNREGISTER)
1739 return NOTIFY_DONE;
f0ad0860
PM		 1740
1741 ipmr_for_each_table(mrt, net) {
1742 v = &mrt->vif_table[0];
1743 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
ebc31979 1744 if (rcu_access_pointer(v->dev) == dev)
e92036a6 1745 vif_delete(mrt, ct, 1, NULL);
f0ad0860 1746 }
1da177e4
LT		 1747 }
1748 return NOTIFY_DONE;
1749}
1750
c354e124 1751static struct notifier_block ip_mr_notifier = {
1da177e4
LT		 1752 .notifier_call = ipmr_device_event,
1753};
1754
7ef8f65d
NA		 1755/* Encapsulate a packet by attaching a valid IPIP header to it.
1756 * This avoids tunnel drivers and other mess and gives us the speed so
1757 * important for multicast video.
1da177e4 1758 */
b6a7719a
HFS		 1759static void ip_encap(struct net *net, struct sk_buff *skb,
1760 __be32 saddr, __be32 daddr)
1da177e4 1761{
8856dfa3 1762 struct iphdr *iph;
b71d1d42 1763 const struct iphdr *old_iph = ip_hdr(skb);
8856dfa3
ACM		 1764
1765 skb_push(skb, sizeof(struct iphdr));
b0e380b1 1766 skb->transport_header = skb->network_header;
8856dfa3 1767 skb_reset_network_header(skb);
eddc9ec5 1768 iph = ip_hdr(skb);
1da177e4 1769
a8cb16dd 1770 iph->version = 4;
e023dd64
ACM		 1771 iph->tos = old_iph->tos;
1772 iph->ttl = old_iph->ttl;
1da177e4
LT		 1773 iph->frag_off = 0;
1774 iph->daddr = daddr;
1775 iph->saddr = saddr;
1776 iph->protocol = IPPROTO_IPIP;
1777 iph->ihl = 5;
1778 iph->tot_len = htons(skb->len);
b6a7719a 1779 ip_select_ident(net, skb, NULL);
1da177e4
LT		 1780 ip_send_check(iph);
1781
1da177e4 1782 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
895b5c9f 1783 nf_reset_ct(skb);
1da177e4
LT		 1784}
1785
0c4b51f0
EB		 1786static inline int ipmr_forward_finish(struct net *net, struct sock *sk,
1787 struct sk_buff *skb)
1da177e4 1788{
a8cb16dd 1789 struct ip_options *opt = &(IPCB(skb)->opt);
1da177e4 1790
73186df8
DM		 1791 IP_INC_STATS(net, IPSTATS_MIB_OUTFORWDATAGRAMS);
1792 IP_ADD_STATS(net, IPSTATS_MIB_OUTOCTETS, skb->len);
1da177e4
LT		 1793
1794 if (unlikely(opt->optlen))
1795 ip_forward_options(skb);
1796
13206b6b 1797 return dst_output(net, sk, skb);
1da177e4
LT		 1798}
1799
a5bc9294
YG		 1800#ifdef CONFIG_NET_SWITCHDEV
1801static bool ipmr_forward_offloaded(struct sk_buff *skb, struct mr_table *mrt,
1802 int in_vifi, int out_vifi)
1803{
1804 struct vif_device *out_vif = &mrt->vif_table[out_vifi];
1805 struct vif_device *in_vif = &mrt->vif_table[in_vifi];
1806
875e8939 1807 if (!skb->offload_l3_fwd_mark)
a5bc9294
YG		 1808 return false;
1809 if (!out_vif->dev_parent_id.id_len || !in_vif->dev_parent_id.id_len)
1810 return false;
1811 return netdev_phys_item_id_same(&out_vif->dev_parent_id,
1812 &in_vif->dev_parent_id);
1813}
1814#else
1815static bool ipmr_forward_offloaded(struct sk_buff *skb, struct mr_table *mrt,
1816 int in_vifi, int out_vifi)
1817{
1818 return false;
1819}
1820#endif
1821
4eadb882 1822/* Processing handlers for ipmr_forward, under rcu_read_lock() */
1da177e4 1823
0c12295a 1824static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
6e0735d1 1825 int in_vifi, struct sk_buff *skb, int vifi)
1da177e4 1826{
eddc9ec5 1827 const struct iphdr *iph = ip_hdr(skb);
0c12295a 1828 struct vif_device *vif = &mrt->vif_table[vifi];
ebc31979 1829 struct net_device *vif_dev;
1da177e4
LT		 1830 struct net_device *dev;
1831 struct rtable *rt;
31e4543d 1832 struct flowi4 fl4;
1da177e4
LT		 1833 int encap = 0;
1834
ebc31979
ED		 1835 vif_dev = vif_dev_read(vif);
1836 if (!vif_dev)
1da177e4
LT		 1837 goto out_free;
1838
1da177e4 1839 if (vif->flags & VIFF_REGISTER) {
559260fd
ED		 1840 WRITE_ONCE(vif->pkt_out, vif->pkt_out + 1);
1841 WRITE_ONCE(vif->bytes_out, vif->bytes_out + skb->len);
c4794d22
ED		 1842 DEV_STATS_ADD(vif_dev, tx_bytes, skb->len);
1843 DEV_STATS_INC(vif_dev, tx_packets);
0c12295a 1844 ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT);
69ebbf58 1845 goto out_free;
1da177e4 1846 }
1da177e4 1847
a5bc9294
YG		 1848 if (ipmr_forward_offloaded(skb, mrt, in_vifi, vifi))
1849 goto out_free;
1850
a8cb16dd 1851 if (vif->flags & VIFF_TUNNEL) {
31e4543d 1852 rt = ip_route_output_ports(net, &fl4, NULL,
78fbfd8a
DM		 1853 vif->remote, vif->local,
1854 0, 0,
1855 IPPROTO_IPIP,
1856 RT_TOS(iph->tos), vif->link);
b23dd4fe 1857 if (IS_ERR(rt))
1da177e4
LT		 1858 goto out_free;
1859 encap = sizeof(struct iphdr);
1860 } else {
31e4543d 1861 rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0,
78fbfd8a
DM		 1862 0, 0,
1863 IPPROTO_IPIP,
1864 RT_TOS(iph->tos), vif->link);
b23dd4fe 1865 if (IS_ERR(rt))
1da177e4
LT		 1866 goto out_free;
1867 }
1868
d8d1f30b 1869 dev = rt->dst.dev;
1da177e4 1870
d8d1f30b 1871 if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) {
1da177e4 1872 /* Do not fragment multicasts. Alas, IPv4 does not
a8cb16dd
ED		 1873 * allow to send ICMP, so that packets will disappear
1874 * to blackhole.
1da177e4 1875 */
73186df8 1876 IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS);
1da177e4
LT		 1877 ip_rt_put(rt);
1878 goto out_free;
1879 }
1880
d8d1f30b 1881 encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len;
1da177e4
LT		 1882
1883 if (skb_cow(skb, encap)) {
e905a9ed 1884 ip_rt_put(rt);
1da177e4
LT		 1885 goto out_free;
1886 }
1887
559260fd
ED		 1888 WRITE_ONCE(vif->pkt_out, vif->pkt_out + 1);
1889 WRITE_ONCE(vif->bytes_out, vif->bytes_out + skb->len);
1da177e4 1890
adf30907 1891 skb_dst_drop(skb);
d8d1f30b 1892 skb_dst_set(skb, &rt->dst);
eddc9ec5 1893 ip_decrease_ttl(ip_hdr(skb));
1da177e4
LT		 1894
1895 /* FIXME: forward and output firewalls used to be called here.
a8cb16dd
ED		 1896 * What do we do with netfilter? -- RR
1897 */
1da177e4 1898 if (vif->flags & VIFF_TUNNEL) {
b6a7719a 1899 ip_encap(net, skb, vif->local, vif->remote);
1da177e4 1900 /* FIXME: extra output firewall step used to be here. --RR */
c4794d22
ED		 1901 DEV_STATS_INC(vif_dev, tx_packets);
1902 DEV_STATS_ADD(vif_dev, tx_bytes, skb->len);
1da177e4
LT		 1903 }
1904
9ee6c5dc 1905 IPCB(skb)->flags |= IPSKB_FORWARDED;
1da177e4 1906
7ef8f65d 1907 /* RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
1da177e4
LT		 1908 * not only before forwarding, but after forwarding on all output
1909 * interfaces. It is clear, if mrouter runs a multicasting
1910 * program, it should receive packets not depending to what interface
1911 * program is joined.
1912 * If we will not make it, the program will have to join on all
1913 * interfaces. On the other hand, multihoming host (or router, but
1914 * not mrouter) cannot join to more than one interface - it will
1915 * result in receiving multiple packets.
1916 */
29a26a56
EB		 1917 NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD,
1918 net, NULL, skb, skb->dev, dev,
1da177e4
LT		 1919 ipmr_forward_finish);
1920 return;
1921
1922out_free:
1923 kfree_skb(skb);
1da177e4
LT		 1924}
1925
9094db4b
ED		 1926/* Called with mrt_lock or rcu_read_lock() */
1927static int ipmr_find_vif(const struct mr_table *mrt, struct net_device *dev)
1da177e4
LT		 1928{
1929 int ct;
9094db4b
ED		 1930 /* Pairs with WRITE_ONCE() in vif_delete()/vif_add() */
1931 for (ct = READ_ONCE(mrt->maxvif) - 1; ct >= 0; ct--) {
ebc31979 1932 if (rcu_access_pointer(mrt->vif_table[ct].dev) == dev)
1da177e4
LT		 1933 break;
1934 }
1935 return ct;
1936}
1937
1938/* "local" means that we should preserve one skb (for local delivery) */
4eadb882 1939/* Called uner rcu_read_lock() */
c4854ec8 1940static void ip_mr_forward(struct net *net, struct mr_table *mrt,
4b1f0d33 1941 struct net_device *dev, struct sk_buff *skb,
494fff56 1942 struct mfc_cache *c, int local)
1da177e4 1943{
4b1f0d33 1944 int true_vifi = ipmr_find_vif(mrt, dev);
1da177e4
LT		 1945 int psend = -1;
1946 int vif, ct;
1947
494fff56
YM		 1948 vif = c->_c.mfc_parent;
1949 c->_c.mfc_un.res.pkt++;
1950 c->_c.mfc_un.res.bytes += skb->len;
1951 c->_c.mfc_un.res.lastuse = jiffies;
1da177e4 1952
494fff56 1953 if (c->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) {
660b26dc
ND		 1954 struct mfc_cache *cache_proxy;
1955
974d8f86 1956 /* For an (*,G) entry, we only check that the incoming
660b26dc
ND		 1957 * interface is part of the static tree.
1958 */
845c9a7a 1959 cache_proxy = mr_mfc_find_any_parent(mrt, vif);
660b26dc 1960 if (cache_proxy &&
494fff56 1961 cache_proxy->_c.mfc_un.res.ttls[true_vifi] < 255)
660b26dc
ND		 1962 goto forward;
1963 }
1964
7ef8f65d 1965 /* Wrong interface: drop packet and (maybe) send PIM assert. */
ebc31979 1966 if (rcu_access_pointer(mrt->vif_table[vif].dev) != dev) {
c7537967 1967 if (rt_is_output_route(skb_rtable(skb))) {
1da177e4 1968 /* It is our own packet, looped back.
a8cb16dd
ED		 1969 * Very complicated situation...
1970 *
1971 * The best workaround until routing daemons will be
1972 * fixed is not to redistribute packet, if it was
1973 * send through wrong interface. It means, that
1974 * multicast applications WILL NOT work for
1975 * (S,G), which have default multicast route pointing
1976 * to wrong oif. In any case, it is not a good
1977 * idea to use multicasting applications on router.
1da177e4
LT		 1978 */
1979 goto dont_forward;
1980 }
1981
494fff56 1982 c->_c.mfc_un.res.wrong_if++;
1da177e4 1983
0c12295a 1984 if (true_vifi >= 0 && mrt->mroute_do_assert &&
1da177e4 1985 /* pimsm uses asserts, when switching from RPT to SPT,
a8cb16dd
ED		 1986 * so that we cannot check that packet arrived on an oif.
1987 * It is bad, but otherwise we would need to move pretty
1988 * large chunk of pimd to kernel. Ough... --ANK
1da177e4 1989 */
0c12295a 1990 (mrt->mroute_do_pim ||
494fff56 1991 c->_c.mfc_un.res.ttls[true_vifi] < 255) &&
e905a9ed 1992 time_after(jiffies,
494fff56
YM		 1993 c->_c.mfc_un.res.last_assert +
1994 MFC_ASSERT_THRESH)) {
1995 c->_c.mfc_un.res.last_assert = jiffies;
0c12295a 1996 ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF);
c921c207
NA		 1997 if (mrt->mroute_do_wrvifwhole)
1998 ipmr_cache_report(mrt, skb, true_vifi,
1999 IGMPMSG_WRVIFWHOLE);
1da177e4
LT		 2000 }
2001 goto dont_forward;
2002 }
2003
660b26dc 2004forward:
559260fd
ED		 2005 WRITE_ONCE(mrt->vif_table[vif].pkt_in,
2006 mrt->vif_table[vif].pkt_in + 1);
2007 WRITE_ONCE(mrt->vif_table[vif].bytes_in,
2008 mrt->vif_table[vif].bytes_in + skb->len);
1da177e4 2009
7ef8f65d 2010 /* Forward the frame */
494fff56
YM		 2011 if (c->mfc_origin == htonl(INADDR_ANY) &&
2012 c->mfc_mcastgrp == htonl(INADDR_ANY)) {
660b26dc 2013 if (true_vifi >= 0 &&
494fff56 2014 true_vifi != c->_c.mfc_parent &&
660b26dc 2015 ip_hdr(skb)->ttl >
494fff56 2016 c->_c.mfc_un.res.ttls[c->_c.mfc_parent]) {
660b26dc
ND		 2017 /* It's an (*,*) entry and the packet is not coming from
2018 * the upstream: forward the packet to the upstream
2019 * only.
2020 */
494fff56 2021 psend = c->_c.mfc_parent;
660b26dc
ND		 2022 goto last_forward;
2023 }
2024 goto dont_forward;
2025 }
494fff56
YM		 2026 for (ct = c->_c.mfc_un.res.maxvif - 1;
2027 ct >= c->_c.mfc_un.res.minvif; ct--) {
660b26dc 2028 /* For (*,G) entry, don't forward to the incoming interface */
494fff56 2029 if ((c->mfc_origin != htonl(INADDR_ANY) ||
360eb5da 2030 ct != true_vifi) &&
494fff56 2031 ip_hdr(skb)->ttl > c->_c.mfc_un.res.ttls[ct]) {
1da177e4
LT		 2032 if (psend != -1) {
2033 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
a8cb16dd 2034
1da177e4 2035 if (skb2)
a5bc9294 2036 ipmr_queue_xmit(net, mrt, true_vifi,
6e0735d1 2037 skb2, psend);
1da177e4 2038 }
c354e124 2039 psend = ct;
1da177e4
LT		 2040 }
2041 }
660b26dc 2042last_forward:
1da177e4
LT		 2043 if (psend != -1) {
2044 if (local) {
2045 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
a8cb16dd 2046
1da177e4 2047 if (skb2)
a5bc9294 2048 ipmr_queue_xmit(net, mrt, true_vifi, skb2,
6e0735d1 2049 psend);
1da177e4 2050 } else {
6e0735d1 2051 ipmr_queue_xmit(net, mrt, true_vifi, skb, psend);
c4854ec8 2052 return;
1da177e4
LT		 2053 }
2054 }
2055
2056dont_forward:
2057 if (!local)
2058 kfree_skb(skb);
1da177e4
LT		 2059}
2060
417da66f 2061static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb)
ee3f1aaf 2062{
417da66f
DM		 2063 struct rtable *rt = skb_rtable(skb);
2064 struct iphdr *iph = ip_hdr(skb);
da91981b 2065 struct flowi4 fl4 = {
417da66f
DM		 2066 .daddr = iph->daddr,
2067 .saddr = iph->saddr,
b0fe4a31 2068 .flowi4_tos = RT_TOS(iph->tos),
4fd551d7
DM		 2069 .flowi4_oif = (rt_is_output_route(rt) ?
2070 skb->dev->ifindex : 0),
2071 .flowi4_iif = (rt_is_output_route(rt) ?
1fb9489b 2072 LOOPBACK_IFINDEX :
4fd551d7 2073 skb->dev->ifindex),
b4869889 2074 .flowi4_mark = skb->mark,
ee3f1aaf
DM		 2075 };
2076 struct mr_table *mrt;
2077 int err;
2078
da91981b 2079 err = ipmr_fib_lookup(net, &fl4, &mrt);
ee3f1aaf
DM		 2080 if (err)
2081 return ERR_PTR(err);
2082 return mrt;
2083}
1da177e4 2084
7ef8f65d
NA		 2085/* Multicast packets for forwarding arrive here
2086 * Called with rcu_read_lock();
1da177e4 2087 */
1da177e4
LT		 2088int ip_mr_input(struct sk_buff *skb)
2089{
2090 struct mfc_cache *cache;
4feb88e5 2091 struct net *net = dev_net(skb->dev);
511c3f92 2092 int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL;
f0ad0860 2093 struct mr_table *mrt;
bcfc7d33
TW		 2094 struct net_device *dev;
2095
2096 /* skb->dev passed in is the loX master dev for vrfs.
2097 * As there are no vifs associated with loopback devices,
2098 * get the proper interface that does have a vif associated with it.
2099 */
2100 dev = skb->dev;
2101 if (netif_is_l3_master(skb->dev)) {
2102 dev = dev_get_by_index_rcu(net, IPCB(skb)->iif);
2103 if (!dev) {
2104 kfree_skb(skb);
2105 return -ENODEV;
2106 }
2107 }
1da177e4
LT		 2108
2109 /* Packet is looped back after forward, it should not be
a8cb16dd 2110 * forwarded second time, but still can be delivered locally.
1da177e4 2111 */
4c968709 2112 if (IPCB(skb)->flags & IPSKB_FORWARDED)
1da177e4
LT		 2113 goto dont_forward;
2114
417da66f 2115 mrt = ipmr_rt_fib_lookup(net, skb);
ee3f1aaf
DM		 2116 if (IS_ERR(mrt)) {
2117 kfree_skb(skb);
2118 return PTR_ERR(mrt);
e40dbc51 2119 }
1da177e4 2120 if (!local) {
4c968709
ED		 2121 if (IPCB(skb)->opt.router_alert) {
2122 if (ip_call_ra_chain(skb))
2123 return 0;
2124 } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) {
2125 /* IGMPv1 (and broken IGMPv2 implementations sort of
2126 * Cisco IOS <= 11.2(8)) do not put router alert
2127 * option to IGMP packets destined to routable
2128 * groups. It is very bad, because it means
2129 * that we can forward NO IGMP messages.
2130 */
2131 struct sock *mroute_sk;
2132
2133 mroute_sk = rcu_dereference(mrt->mroute_sk);
2134 if (mroute_sk) {
895b5c9f 2135 nf_reset_ct(skb);
4c968709
ED		 2136 raw_rcv(mroute_sk, skb);
2137 return 0;
2138 }
92c4bed5 2139 }
1da177e4
LT		 2140 }
2141
a8c9486b 2142 /* already under rcu_read_lock() */
0c12295a 2143 cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
51456b29 2144 if (!cache) {
bcfc7d33 2145 int vif = ipmr_find_vif(mrt, dev);
660b26dc
ND		 2146
2147 if (vif >= 0)
2148 cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr,
2149 vif);
2150 }
1da177e4 2151
7ef8f65d 2152 /* No usable cache entry */
51456b29 2153 if (!cache) {
1da177e4
LT		 2154 int vif;
2155
2156 if (local) {
2157 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2158 ip_local_deliver(skb);
51456b29 2159 if (!skb2)
1da177e4 2160 return -ENOBUFS;
1da177e4
LT		 2161 skb = skb2;
2162 }
2163
bcfc7d33 2164 vif = ipmr_find_vif(mrt, dev);
9094db4b
ED		 2165 if (vif >= 0)
2166 return ipmr_cache_unresolved(mrt, vif, skb, dev);
1da177e4
LT		 2167 kfree_skb(skb);
2168 return -ENODEV;
2169 }
2170
4b1f0d33 2171 ip_mr_forward(net, mrt, dev, skb, cache, local);
1da177e4
LT		 2172
2173 if (local)
2174 return ip_local_deliver(skb);
2175
2176 return 0;
2177
2178dont_forward:
2179 if (local)
2180 return ip_local_deliver(skb);
2181 kfree_skb(skb);
2182 return 0;
2183}
2184
b1879204 2185#ifdef CONFIG_IP_PIMSM_V1
7ef8f65d 2186/* Handle IGMP messages of PIMv1 */
a8cb16dd 2187int pim_rcv_v1(struct sk_buff *skb)
b1879204
IJ		 2188{
2189 struct igmphdr *pim;
4feb88e5 2190 struct net *net = dev_net(skb->dev);
f0ad0860 2191 struct mr_table *mrt;
b1879204
IJ		 2192
2193 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
2194 goto drop;
2195
2196 pim = igmp_hdr(skb);
2197
417da66f 2198 mrt = ipmr_rt_fib_lookup(net, skb);
ee3f1aaf
DM		 2199 if (IS_ERR(mrt))
2200 goto drop;
0c12295a 2201 if (!mrt->mroute_do_pim ||
b1879204
IJ		 2202 pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER)
2203 goto drop;
2204
f0ad0860 2205 if (__pim_rcv(mrt, skb, sizeof(*pim))) {
b1879204
IJ		 2206drop:
2207 kfree_skb(skb);
2208 }
1da177e4
LT		 2209 return 0;
2210}
2211#endif
2212
2213#ifdef CONFIG_IP_PIMSM_V2
a8cb16dd 2214static int pim_rcv(struct sk_buff *skb)
1da177e4
LT		 2215{
2216 struct pimreghdr *pim;
f0ad0860
PM		 2217 struct net *net = dev_net(skb->dev);
2218 struct mr_table *mrt;
1da177e4 2219
b1879204 2220 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
1da177e4
LT		 2221 goto drop;
2222
9c70220b 2223 pim = (struct pimreghdr *)skb_transport_header(skb);
56245cae 2224 if (pim->type != ((PIM_VERSION << 4) | (PIM_TYPE_REGISTER)) ||
a8cb16dd 2225 (pim->flags & PIM_NULL_REGISTER) ||
e905a9ed 2226 (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 &&
d3bc23e7 2227 csum_fold(skb_checksum(skb, 0, skb->len, 0))))
1da177e4
LT		 2228 goto drop;
2229
417da66f 2230 mrt = ipmr_rt_fib_lookup(net, skb);
ee3f1aaf
DM		 2231 if (IS_ERR(mrt))
2232 goto drop;
f0ad0860 2233 if (__pim_rcv(mrt, skb, sizeof(*pim))) {
b1879204
IJ		 2234drop:
2235 kfree_skb(skb);
2236 }
1da177e4
LT		 2237 return 0;
2238}
2239#endif
2240
9a1b9496
DM		 2241int ipmr_get_route(struct net *net, struct sk_buff *skb,
2242 __be32 saddr, __be32 daddr,
9f09eaea 2243 struct rtmsg *rtm, u32 portid)
1da177e4 2244{
1da177e4 2245 struct mfc_cache *cache;
9a1b9496
DM		 2246 struct mr_table *mrt;
2247 int err;
1da177e4 2248
f0ad0860 2249 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
51456b29 2250 if (!mrt)
f0ad0860
PM		 2251 return -ENOENT;
2252
a8c9486b 2253 rcu_read_lock();
9a1b9496 2254 cache = ipmr_cache_find(mrt, saddr, daddr);
51456b29 2255 if (!cache && skb->dev) {
660b26dc 2256 int vif = ipmr_find_vif(mrt, skb->dev);
1da177e4 2257
660b26dc
ND		 2258 if (vif >= 0)
2259 cache = ipmr_cache_find_any(mrt, daddr, vif);
2260 }
51456b29 2261 if (!cache) {
72287490 2262 struct sk_buff *skb2;
eddc9ec5 2263 struct iphdr *iph;
1da177e4 2264 struct net_device *dev;
a8cb16dd 2265 int vif = -1;
1da177e4 2266
1da177e4 2267 dev = skb->dev;
a8cb16dd
ED		 2268 if (dev)
2269 vif = ipmr_find_vif(mrt, dev);
2270 if (vif < 0) {
a8c9486b 2271 rcu_read_unlock();
1da177e4
LT		 2272 return -ENODEV;
2273 }
7901cd97
GN		 2274
2275 skb2 = skb_realloc_headroom(skb, sizeof(struct iphdr));
72287490 2276 if (!skb2) {
a8c9486b 2277 rcu_read_unlock();
72287490
AK		 2278 return -ENOMEM;
2279 }
2280
2cf75070 2281 NETLINK_CB(skb2).portid = portid;
e2d1bca7
ACM		 2282 skb_push(skb2, sizeof(struct iphdr));
2283 skb_reset_network_header(skb2);
eddc9ec5
ACM		 2284 iph = ip_hdr(skb2);
2285 iph->ihl = sizeof(struct iphdr) >> 2;
9a1b9496
DM		 2286 iph->saddr = saddr;
2287 iph->daddr = daddr;
eddc9ec5 2288 iph->version = 0;
4b1f0d33 2289 err = ipmr_cache_unresolved(mrt, vif, skb2, dev);
a8c9486b 2290 rcu_read_unlock();
1da177e4
LT		 2291 return err;
2292 }
2293
7b0db857 2294 err = mr_fill_mroute(mrt, skb, &cache->_c, rtm);
a8c9486b 2295 rcu_read_unlock();
1da177e4
LT		 2296 return err;
2297}
2298
cb6a4e46 2299static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
65886f43
ND		 2300 u32 portid, u32 seq, struct mfc_cache *c, int cmd,
2301 int flags)
cb6a4e46
PM		 2302{
2303 struct nlmsghdr *nlh;
2304 struct rtmsg *rtm;
1eb99af5 2305 int err;
cb6a4e46 2306
65886f43 2307 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
51456b29 2308 if (!nlh)
cb6a4e46
PM		 2309 return -EMSGSIZE;
2310
2311 rtm = nlmsg_data(nlh);
2312 rtm->rtm_family = RTNL_FAMILY_IPMR;
2313 rtm->rtm_dst_len = 32;
2314 rtm->rtm_src_len = 32;
2315 rtm->rtm_tos = 0;
2316 rtm->rtm_table = mrt->id;
f3756b79
DM		 2317 if (nla_put_u32(skb, RTA_TABLE, mrt->id))
2318 goto nla_put_failure;
cb6a4e46
PM		 2319 rtm->rtm_type = RTN_MULTICAST;
2320 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
494fff56 2321 if (c->_c.mfc_flags & MFC_STATIC)
9a68ac72
ND		 2322 rtm->rtm_protocol = RTPROT_STATIC;
2323 else
2324 rtm->rtm_protocol = RTPROT_MROUTED;
cb6a4e46
PM		 2325 rtm->rtm_flags = 0;
2326
930345ea
JB		 2327 if (nla_put_in_addr(skb, RTA_SRC, c->mfc_origin) ||
2328 nla_put_in_addr(skb, RTA_DST, c->mfc_mcastgrp))
f3756b79 2329 goto nla_put_failure;
7b0db857 2330 err = mr_fill_mroute(mrt, skb, &c->_c, rtm);
1eb99af5
ND		 2331 /* do not break the dump if cache is unresolved */
2332 if (err < 0 && err != -ENOENT)
cb6a4e46
PM		 2333 goto nla_put_failure;
2334
053c095a
JB		 2335 nlmsg_end(skb, nlh);
2336 return 0;
cb6a4e46
PM		 2337
2338nla_put_failure:
2339 nlmsg_cancel(skb, nlh);
2340 return -EMSGSIZE;
2341}
2342
7b0db857
YM		 2343static int _ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2344 u32 portid, u32 seq, struct mr_mfc *c, int cmd,
2345 int flags)
2346{
2347 return ipmr_fill_mroute(mrt, skb, portid, seq, (struct mfc_cache *)c,
2348 cmd, flags);
2349}
2350
8cd3ac9f
ND		 2351static size_t mroute_msgsize(bool unresolved, int maxvif)
2352{
2353 size_t len =
2354 NLMSG_ALIGN(sizeof(struct rtmsg))
2355 + nla_total_size(4) /* RTA_TABLE */
2356 + nla_total_size(4) /* RTA_SRC */
2357 + nla_total_size(4) /* RTA_DST */
2358 ;
2359
2360 if (!unresolved)
2361 len = len
2362 + nla_total_size(4) /* RTA_IIF */
2363 + nla_total_size(0) /* RTA_MULTIPATH */
2364 + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
2365 /* RTA_MFC_STATS */
a9a08042 2366 + nla_total_size_64bit(sizeof(struct rta_mfc_stats))
8cd3ac9f
ND		 2367 ;
2368
2369 return len;
2370}
2371
2372static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
2373 int cmd)
2374{
2375 struct net *net = read_pnet(&mrt->net);
2376 struct sk_buff *skb;
2377 int err = -ENOBUFS;
2378
494fff56
YM		 2379 skb = nlmsg_new(mroute_msgsize(mfc->_c.mfc_parent >= MAXVIFS,
2380 mrt->maxvif),
8cd3ac9f 2381 GFP_ATOMIC);
51456b29 2382 if (!skb)
8cd3ac9f
ND		 2383 goto errout;
2384
65886f43 2385 err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
8cd3ac9f
ND		 2386 if (err < 0)
2387 goto errout;
2388
2389 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE, NULL, GFP_ATOMIC);
2390 return;
2391
2392errout:
2393 kfree_skb(skb);
2394 if (err < 0)
2395 rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE, err);
2396}
2397
5a645dd8
JG		 2398static size_t igmpmsg_netlink_msgsize(size_t payloadlen)
2399{
2400 size_t len =
2401 NLMSG_ALIGN(sizeof(struct rtgenmsg))
2402 + nla_total_size(1) /* IPMRA_CREPORT_MSGTYPE */
2403 + nla_total_size(4) /* IPMRA_CREPORT_VIF_ID */
2404 + nla_total_size(4) /* IPMRA_CREPORT_SRC_ADDR */
2405 + nla_total_size(4) /* IPMRA_CREPORT_DST_ADDR */
501cb008 2406 + nla_total_size(4) /* IPMRA_CREPORT_TABLE */
5a645dd8
JG		 2407 /* IPMRA_CREPORT_PKT */
2408 + nla_total_size(payloadlen)
2409 ;
2410
2411 return len;
2412}
2413
0b490b51 2414static void igmpmsg_netlink_event(const struct mr_table *mrt, struct sk_buff *pkt)
5a645dd8
JG		 2415{
2416 struct net *net = read_pnet(&mrt->net);
2417 struct nlmsghdr *nlh;
2418 struct rtgenmsg *rtgenm;
2419 struct igmpmsg *msg;
2420 struct sk_buff *skb;
2421 struct nlattr *nla;
2422 int payloadlen;
2423
2424 payloadlen = pkt->len - sizeof(struct igmpmsg);
2425 msg = (struct igmpmsg *)skb_network_header(pkt);
2426
2427 skb = nlmsg_new(igmpmsg_netlink_msgsize(payloadlen), GFP_ATOMIC);
2428 if (!skb)
2429 goto errout;
2430
2431 nlh = nlmsg_put(skb, 0, 0, RTM_NEWCACHEREPORT,
2432 sizeof(struct rtgenmsg), 0);
2433 if (!nlh)
2434 goto errout;
2435 rtgenm = nlmsg_data(nlh);
2436 rtgenm->rtgen_family = RTNL_FAMILY_IPMR;
2437 if (nla_put_u8(skb, IPMRA_CREPORT_MSGTYPE, msg->im_msgtype) ||
bb82067c 2438 nla_put_u32(skb, IPMRA_CREPORT_VIF_ID, msg->im_vif | (msg->im_vif_hi << 8)) ||
5a645dd8
JG		 2439 nla_put_in_addr(skb, IPMRA_CREPORT_SRC_ADDR,
2440 msg->im_src.s_addr) ||
2441 nla_put_in_addr(skb, IPMRA_CREPORT_DST_ADDR,
501cb008
PD		 2442 msg->im_dst.s_addr) ||
2443 nla_put_u32(skb, IPMRA_CREPORT_TABLE, mrt->id))
5a645dd8
JG		 2444 goto nla_put_failure;
2445
2446 nla = nla_reserve(skb, IPMRA_CREPORT_PKT, payloadlen);
2447 if (!nla || skb_copy_bits(pkt, sizeof(struct igmpmsg),
2448 nla_data(nla), payloadlen))
2449 goto nla_put_failure;
2450
2451 nlmsg_end(skb, nlh);
2452
2453 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE_R, NULL, GFP_ATOMIC);
2454 return;
2455
2456nla_put_failure:
2457 nlmsg_cancel(skb, nlh);
2458errout:
2459 kfree_skb(skb);
2460 rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE_R, -ENOBUFS);
2461}
2462
d0440029
JK		 2463static int ipmr_rtm_valid_getroute_req(struct sk_buff *skb,
2464 const struct nlmsghdr *nlh,
2465 struct nlattr **tb,
2466 struct netlink_ext_ack *extack)
2467{
2468 struct rtmsg *rtm;
2469 int i, err;
2470
2471 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
2472 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for multicast route get request");
2473 return -EINVAL;
2474 }
2475
2476 if (!netlink_strict_get_check(skb))
8cb08174
JB		 2477 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
2478 rtm_ipv4_policy, extack);
d0440029
JK		 2479
2480 rtm = nlmsg_data(nlh);
2481 if ((rtm->rtm_src_len && rtm->rtm_src_len != 32) ||
2482 (rtm->rtm_dst_len && rtm->rtm_dst_len != 32) ||
2483 rtm->rtm_tos || rtm->rtm_table || rtm->rtm_protocol ||
2484 rtm->rtm_scope || rtm->rtm_type || rtm->rtm_flags) {
2485 NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for multicast route get request");
2486 return -EINVAL;
2487 }
2488
8cb08174
JB		 2489 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
2490 rtm_ipv4_policy, extack);
d0440029
JK		 2491 if (err)
2492 return err;
2493
2494 if ((tb[RTA_SRC] && !rtm->rtm_src_len) ||
2495 (tb[RTA_DST] && !rtm->rtm_dst_len)) {
2496 NL_SET_ERR_MSG(extack, "ipv4: rtm_src_len and rtm_dst_len must be 32 for IPv4");
2497 return -EINVAL;
2498 }
2499
2500 for (i = 0; i <= RTA_MAX; i++) {
2501 if (!tb[i])
2502 continue;
2503
2504 switch (i) {
2505 case RTA_SRC:
2506 case RTA_DST:
2507 case RTA_TABLE:
2508 break;
2509 default:
2510 NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in multicast route get request");
2511 return -EINVAL;
2512 }
2513 }
2514
2515 return 0;
2516}
2517
4f75ba69
DS		 2518static int ipmr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
2519 struct netlink_ext_ack *extack)
2520{
2521 struct net *net = sock_net(in_skb->sk);
2522 struct nlattr *tb[RTA_MAX + 1];
2523 struct sk_buff *skb = NULL;
2524 struct mfc_cache *cache;
2525 struct mr_table *mrt;
4f75ba69
DS		 2526 __be32 src, grp;
2527 u32 tableid;
2528 int err;
2529
d0440029 2530 err = ipmr_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
4f75ba69
DS		 2531 if (err < 0)
2532 goto errout;
2533
4f75ba69
DS		 2534 src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0;
2535 grp = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0;
2536 tableid = tb[RTA_TABLE] ? nla_get_u32(tb[RTA_TABLE]) : 0;
2537
2538 mrt = ipmr_get_table(net, tableid ? tableid : RT_TABLE_DEFAULT);
2e3d232e
DC		 2539 if (!mrt) {
2540 err = -ENOENT;
4f75ba69
DS		 2541 goto errout_free;
2542 }
2543
2544 /* entries are added/deleted only under RTNL */
2545 rcu_read_lock();
2546 cache = ipmr_cache_find(mrt, src, grp);
2547 rcu_read_unlock();
2548 if (!cache) {
2549 err = -ENOENT;
2550 goto errout_free;
2551 }
2552
2553 skb = nlmsg_new(mroute_msgsize(false, mrt->maxvif), GFP_KERNEL);
2554 if (!skb) {
2555 err = -ENOBUFS;
2556 goto errout_free;
2557 }
2558
2559 err = ipmr_fill_mroute(mrt, skb, NETLINK_CB(in_skb).portid,
2560 nlh->nlmsg_seq, cache,
2561 RTM_NEWROUTE, 0);
2562 if (err < 0)
2563 goto errout_free;
2564
2565 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2566
2567errout:
2568 return err;
2569
2570errout_free:
2571 kfree_skb(skb);
2572 goto errout;
2573}
2574
cb6a4e46
PM		 2575static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2576{
4724676d 2577 struct fib_dump_filter filter = {};
cb167893 2578 int err;
4724676d 2579
e8ba330a 2580 if (cb->strict_check) {
4724676d 2581 err = ip_valid_fib_dump_req(sock_net(skb->sk), cb->nlh,
effe6792 2582 &filter, cb);
e8ba330a
DA		 2583 if (err < 0)
2584 return err;
2585 }
2586
cb167893
DA		 2587 if (filter.table_id) {
2588 struct mr_table *mrt;
2589
2590 mrt = ipmr_get_table(sock_net(skb->sk), filter.table_id);
2591 if (!mrt) {
41b4bd98 2592 if (rtnl_msg_family(cb->nlh) != RTNL_FAMILY_IPMR)
ae677bbb
DA		 2593 return skb->len;
2594
cb167893
DA		 2595 NL_SET_ERR_MSG(cb->extack, "ipv4: MR table does not exist");
2596 return -ENOENT;
2597 }
2598 err = mr_table_dump(mrt, skb, cb, _ipmr_fill_mroute,
2599 &mfc_unres_lock, &filter);
2600 return skb->len ? : err;
2601 }
2602
7b0db857 2603 return mr_rtm_dumproute(skb, cb, ipmr_mr_table_iter,
cb167893 2604 _ipmr_fill_mroute, &mfc_unres_lock, &filter);
cb6a4e46
PM		 2605}
2606
ccbb0aa6
NA		 2607static const struct nla_policy rtm_ipmr_policy[RTA_MAX + 1] = {
2608 [RTA_SRC] = { .type = NLA_U32 },
2609 [RTA_DST] = { .type = NLA_U32 },
2610 [RTA_IIF] = { .type = NLA_U32 },
2611 [RTA_TABLE] = { .type = NLA_U32 },
2612 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2613};
2614
2615static bool ipmr_rtm_validate_proto(unsigned char rtm_protocol)
2616{
2617 switch (rtm_protocol) {
2618 case RTPROT_STATIC:
2619 case RTPROT_MROUTED:
2620 return true;
2621 }
2622 return false;
2623}
2624
2625static int ipmr_nla_get_ttls(const struct nlattr *nla, struct mfcctl *mfcc)
2626{
2627 struct rtnexthop *rtnh = nla_data(nla);
2628 int remaining = nla_len(nla), vifi = 0;
2629
2630 while (rtnh_ok(rtnh, remaining)) {
2631 mfcc->mfcc_ttls[vifi] = rtnh->rtnh_hops;
2632 if (++vifi == MAXVIFS)
2633 break;
2634 rtnh = rtnh_next(rtnh, &remaining);
2635 }
2636
2637 return remaining > 0 ? -EINVAL : vifi;
2638}
2639
2640/* returns < 0 on error, 0 for ADD_MFC and 1 for ADD_MFC_PROXY */
2641static int rtm_to_ipmr_mfcc(struct net *net, struct nlmsghdr *nlh,
2642 struct mfcctl *mfcc, int *mrtsock,
c21ef3e3
DA		 2643 struct mr_table **mrtret,
2644 struct netlink_ext_ack *extack)
ccbb0aa6
NA		 2645{
2646 struct net_device *dev = NULL;
2647 u32 tblid = RT_TABLE_DEFAULT;
2648 struct mr_table *mrt;
2649 struct nlattr *attr;
2650 struct rtmsg *rtm;
2651 int ret, rem;
2652
8cb08174
JB		 2653 ret = nlmsg_validate_deprecated(nlh, sizeof(*rtm), RTA_MAX,
2654 rtm_ipmr_policy, extack);
ccbb0aa6
NA		 2655 if (ret < 0)
2656 goto out;
2657 rtm = nlmsg_data(nlh);
2658
2659 ret = -EINVAL;
2660 if (rtm->rtm_family != RTNL_FAMILY_IPMR || rtm->rtm_dst_len != 32 ||
2661 rtm->rtm_type != RTN_MULTICAST ||
2662 rtm->rtm_scope != RT_SCOPE_UNIVERSE ||
2663 !ipmr_rtm_validate_proto(rtm->rtm_protocol))
2664 goto out;
2665
2666 memset(mfcc, 0, sizeof(*mfcc));
2667 mfcc->mfcc_parent = -1;
2668 ret = 0;
2669 nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), rem) {
2670 switch (nla_type(attr)) {
2671 case RTA_SRC:
2672 mfcc->mfcc_origin.s_addr = nla_get_be32(attr);
2673 break;
2674 case RTA_DST:
2675 mfcc->mfcc_mcastgrp.s_addr = nla_get_be32(attr);
2676 break;
2677 case RTA_IIF:
2678 dev = __dev_get_by_index(net, nla_get_u32(attr));
2679 if (!dev) {
2680 ret = -ENODEV;
2681 goto out;
2682 }
2683 break;
2684 case RTA_MULTIPATH:
2685 if (ipmr_nla_get_ttls(attr, mfcc) < 0) {
2686 ret = -EINVAL;
2687 goto out;
2688 }
2689 break;
2690 case RTA_PREFSRC:
2691 ret = 1;
2692 break;
2693 case RTA_TABLE:
2694 tblid = nla_get_u32(attr);
2695 break;
2696 }
2697 }
2698 mrt = ipmr_get_table(net, tblid);
2699 if (!mrt) {
2700 ret = -ENOENT;
2701 goto out;
2702 }
2703 *mrtret = mrt;
2704 *mrtsock = rtm->rtm_protocol == RTPROT_MROUTED ? 1 : 0;
2705 if (dev)
2706 mfcc->mfcc_parent = ipmr_find_vif(mrt, dev);
2707
2708out:
2709 return ret;
2710}
2711
2712/* takes care of both newroute and delroute */
c21ef3e3
DA		 2713static int ipmr_rtm_route(struct sk_buff *skb, struct nlmsghdr *nlh,
2714 struct netlink_ext_ack *extack)
ccbb0aa6
NA		 2715{
2716 struct net *net = sock_net(skb->sk);
2717 int ret, mrtsock, parent;
2718 struct mr_table *tbl;
2719 struct mfcctl mfcc;
2720
2721 mrtsock = 0;
2722 tbl = NULL;
c21ef3e3 2723 ret = rtm_to_ipmr_mfcc(net, nlh, &mfcc, &mrtsock, &tbl, extack);
ccbb0aa6
NA		 2724 if (ret < 0)
2725 return ret;
2726
2727 parent = ret ? mfcc.mfcc_parent : -1;
2728 if (nlh->nlmsg_type == RTM_NEWROUTE)
2729 return ipmr_mfc_add(net, tbl, &mfcc, mrtsock, parent);
2730 else
2731 return ipmr_mfc_delete(tbl, &mfcc, parent);
2732}
2733
772c344d
NA		 2734static bool ipmr_fill_table(struct mr_table *mrt, struct sk_buff *skb)
2735{
2736 u32 queue_len = atomic_read(&mrt->cache_resolve_queue_len);
2737
2738 if (nla_put_u32(skb, IPMRA_TABLE_ID, mrt->id) ||
2739 nla_put_u32(skb, IPMRA_TABLE_CACHE_RES_QUEUE_LEN, queue_len) ||
2740 nla_put_s32(skb, IPMRA_TABLE_MROUTE_REG_VIF_NUM,
2741 mrt->mroute_reg_vif_num) ||
2742 nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_ASSERT,
2743 mrt->mroute_do_assert) ||
c921c207
NA		 2744 nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_PIM, mrt->mroute_do_pim) ||
2745 nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_WRVIFWHOLE,
2746 mrt->mroute_do_wrvifwhole))
772c344d
NA		 2747 return false;
2748
2749 return true;
2750}
2751
2752static bool ipmr_fill_vif(struct mr_table *mrt, u32 vifid, struct sk_buff *skb)
2753{
ebc31979 2754 struct net_device *vif_dev;
772c344d
NA		 2755 struct nlattr *vif_nest;
2756 struct vif_device *vif;
2757
ebc31979 2758 vif = &mrt->vif_table[vifid];
0fcae3c8 2759 vif_dev = rtnl_dereference(vif->dev);
772c344d 2760 /* if the VIF doesn't exist just continue */
ebc31979 2761 if (!vif_dev)
772c344d
NA		 2762 return true;
2763
ae0be8de 2764 vif_nest = nla_nest_start_noflag(skb, IPMRA_VIF);
772c344d
NA		 2765 if (!vif_nest)
2766 return false;
ebc31979
ED		 2767
2768 if (nla_put_u32(skb, IPMRA_VIFA_IFINDEX, vif_dev->ifindex) ||
772c344d
NA		 2769 nla_put_u32(skb, IPMRA_VIFA_VIF_ID, vifid) ||
2770 nla_put_u16(skb, IPMRA_VIFA_FLAGS, vif->flags) ||
2771 nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_IN, vif->bytes_in,
2772 IPMRA_VIFA_PAD) ||
2773 nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_OUT, vif->bytes_out,
2774 IPMRA_VIFA_PAD) ||
2775 nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_IN, vif->pkt_in,
2776 IPMRA_VIFA_PAD) ||
2777 nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_OUT, vif->pkt_out,
2778 IPMRA_VIFA_PAD) ||
2779 nla_put_be32(skb, IPMRA_VIFA_LOCAL_ADDR, vif->local) ||
2780 nla_put_be32(skb, IPMRA_VIFA_REMOTE_ADDR, vif->remote)) {
2781 nla_nest_cancel(skb, vif_nest);
2782 return false;
2783 }
2784 nla_nest_end(skb, vif_nest);
2785
2786 return true;
2787}
2788
14fc5bb2
DA		 2789static int ipmr_valid_dumplink(const struct nlmsghdr *nlh,
2790 struct netlink_ext_ack *extack)
2791{
2792 struct ifinfomsg *ifm;
2793
2794 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
2795 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for ipmr link dump");
2796 return -EINVAL;
2797 }
2798
2799 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
2800 NL_SET_ERR_MSG(extack, "Invalid data after header in ipmr link dump");
2801 return -EINVAL;
2802 }
2803
2804 ifm = nlmsg_data(nlh);
2805 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
2806 ifm->ifi_change || ifm->ifi_index) {
2807 NL_SET_ERR_MSG(extack, "Invalid values in header for ipmr link dump request");
2808 return -EINVAL;
2809 }
2810
2811 return 0;
2812}
2813
772c344d
NA		 2814static int ipmr_rtm_dumplink(struct sk_buff *skb, struct netlink_callback *cb)
2815{
2816 struct net *net = sock_net(skb->sk);
2817 struct nlmsghdr *nlh = NULL;
2818 unsigned int t = 0, s_t;
2819 unsigned int e = 0, s_e;
2820 struct mr_table *mrt;
2821
14fc5bb2
DA		 2822 if (cb->strict_check) {
2823 int err = ipmr_valid_dumplink(cb->nlh, cb->extack);
2824
2825 if (err < 0)
2826 return err;
2827 }
2828
772c344d
NA		 2829 s_t = cb->args[0];
2830 s_e = cb->args[1];
2831
2832 ipmr_for_each_table(mrt, net) {
2833 struct nlattr *vifs, *af;
2834 struct ifinfomsg *hdr;
2835 u32 i;
2836
2837 if (t < s_t)
2838 goto skip_table;
2839 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
2840 cb->nlh->nlmsg_seq, RTM_NEWLINK,
2841 sizeof(*hdr), NLM_F_MULTI);
2842 if (!nlh)
2843 break;
2844
2845 hdr = nlmsg_data(nlh);
2846 memset(hdr, 0, sizeof(*hdr));
2847 hdr->ifi_family = RTNL_FAMILY_IPMR;
2848
ae0be8de 2849 af = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
772c344d
NA		 2850 if (!af) {
2851 nlmsg_cancel(skb, nlh);
2852 goto out;
2853 }
2854
2855 if (!ipmr_fill_table(mrt, skb)) {
2856 nlmsg_cancel(skb, nlh);
2857 goto out;
2858 }
2859
ae0be8de 2860 vifs = nla_nest_start_noflag(skb, IPMRA_TABLE_VIFS);
772c344d
NA		 2861 if (!vifs) {
2862 nla_nest_end(skb, af);
2863 nlmsg_end(skb, nlh);
2864 goto out;
2865 }
2866 for (i = 0; i < mrt->maxvif; i++) {
2867 if (e < s_e)
2868 goto skip_entry;
2869 if (!ipmr_fill_vif(mrt, i, skb)) {
2870 nla_nest_end(skb, vifs);
2871 nla_nest_end(skb, af);
2872 nlmsg_end(skb, nlh);
2873 goto out;
2874 }
2875skip_entry:
2876 e++;
2877 }
2878 s_e = 0;
2879 e = 0;
2880 nla_nest_end(skb, vifs);
2881 nla_nest_end(skb, af);
2882 nlmsg_end(skb, nlh);
2883skip_table:
2884 t++;
2885 }
2886
2887out:
2888 cb->args[1] = e;
2889 cb->args[0] = t;
2890
2891 return skb->len;
2892}
2893
e905a9ed 2894#ifdef CONFIG_PROC_FS
7ef8f65d
NA		 2895/* The /proc interfaces to multicast routing :
2896 * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif
1da177e4 2897 */
1da177e4
LT		 2898
2899static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos)
b96ef16d 2900 __acquires(RCU)
1da177e4 2901{
3feda6b4 2902 struct mr_vif_iter *iter = seq->private;
f6bb4514 2903 struct net *net = seq_file_net(seq);
f0ad0860
PM		 2904 struct mr_table *mrt;
2905
2906 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
51456b29 2907 if (!mrt)
f0ad0860
PM		 2908 return ERR_PTR(-ENOENT);
2909
2910 iter->mrt = mrt;
f6bb4514 2911
b96ef16d 2912 rcu_read_lock();
3feda6b4 2913 return mr_vif_seq_start(seq, pos);
1da177e4
LT		 2914}
2915
2916static void ipmr_vif_seq_stop(struct seq_file *seq, void *v)
b96ef16d 2917 __releases(RCU)
1da177e4 2918{
b96ef16d 2919 rcu_read_unlock();
1da177e4
LT		 2920}
2921
2922static int ipmr_vif_seq_show(struct seq_file *seq, void *v)
2923{
3feda6b4 2924 struct mr_vif_iter *iter = seq->private;
f0ad0860 2925 struct mr_table *mrt = iter->mrt;
f6bb4514 2926
1da177e4 2927 if (v == SEQ_START_TOKEN) {
e905a9ed 2928 seq_puts(seq,
1da177e4
LT		 2929 "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n");
2930 } else {
2931 const struct vif_device *vif = v;
ebc31979
ED		 2932 const struct net_device *vif_dev;
2933 const char *name;
1da177e4 2934
ebc31979
ED		 2935 vif_dev = vif_dev_read(vif);
2936 name = vif_dev ? vif_dev->name : "none";
1da177e4 2937 seq_printf(seq,
91e6dd82 2938 "%2td %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n",
0c12295a 2939 vif - mrt->vif_table,
e905a9ed 2940 name, vif->bytes_in, vif->pkt_in,
1da177e4
LT		 2941 vif->bytes_out, vif->pkt_out,
2942 vif->flags, vif->local, vif->remote);
2943 }
2944 return 0;
2945}
2946
f690808e 2947static const struct seq_operations ipmr_vif_seq_ops = {
1da177e4 2948 .start = ipmr_vif_seq_start,
3feda6b4 2949 .next = mr_vif_seq_next,
1da177e4
LT		 2950 .stop = ipmr_vif_seq_stop,
2951 .show = ipmr_vif_seq_show,
2952};
2953
1da177e4
LT		 2954static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
2955{
f6bb4514 2956 struct net *net = seq_file_net(seq);
f0ad0860 2957 struct mr_table *mrt;
f6bb4514 2958
f0ad0860 2959 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
51456b29 2960 if (!mrt)
f0ad0860 2961 return ERR_PTR(-ENOENT);
f6bb4514 2962
c8d61968 2963 return mr_mfc_seq_start(seq, pos, mrt, &mfc_unres_lock);
1da177e4
LT		 2964}
2965
2966static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
2967{
2968 int n;
2969
2970 if (v == SEQ_START_TOKEN) {
e905a9ed 2971 seq_puts(seq,
1da177e4
LT		 2972 "Group Origin Iif Pkts Bytes Wrong Oifs\n");
2973 } else {
2974 const struct mfc_cache *mfc = v;
c8d61968 2975 const struct mr_mfc_iter *it = seq->private;
f0ad0860 2976 const struct mr_table *mrt = it->mrt;
e905a9ed 2977
0eae88f3
ED		 2978 seq_printf(seq, "%08X %08X %-3hd",
2979 (__force u32) mfc->mfc_mcastgrp,
2980 (__force u32) mfc->mfc_origin,
494fff56 2981 mfc->_c.mfc_parent);
1da177e4 2982
0c12295a 2983 if (it->cache != &mrt->mfc_unres_queue) {
1ea472e2 2984 seq_printf(seq, " %8lu %8lu %8lu",
494fff56
YM		 2985 mfc->_c.mfc_un.res.pkt,
2986 mfc->_c.mfc_un.res.bytes,
2987 mfc->_c.mfc_un.res.wrong_if);
2988 for (n = mfc->_c.mfc_un.res.minvif;
2989 n < mfc->_c.mfc_un.res.maxvif; n++) {
0c12295a 2990 if (VIF_EXISTS(mrt, n) &&
494fff56 2991 mfc->_c.mfc_un.res.ttls[n] < 255)
cf958ae3 2992 seq_printf(seq,
e905a9ed 2993 " %2d:%-3d",
494fff56 2994 n, mfc->_c.mfc_un.res.ttls[n]);
1da177e4 2995 }
1ea472e2
BT		 2996 } else {
2997 /* unresolved mfc_caches don't contain
2998 * pkt, bytes and wrong_if values
2999 */
3000 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
1da177e4
LT		 3001 }
3002 seq_putc(seq, '\n');
3003 }
3004 return 0;
3005}
3006
f690808e 3007static const struct seq_operations ipmr_mfc_seq_ops = {
1da177e4 3008 .start = ipmr_mfc_seq_start,
c8d61968
YM		 3009 .next = mr_mfc_seq_next,
3010 .stop = mr_mfc_seq_stop,
1da177e4
LT		 3011 .show = ipmr_mfc_seq_show,
3012};
e905a9ed 3013#endif
1da177e4
LT		 3014
3015#ifdef CONFIG_IP_PIMSM_V2
32613090 3016static const struct net_protocol pim_protocol = {
1da177e4
LT		 3017 .handler = pim_rcv,
3018};
3019#endif
3020
4d65b948
YG		 3021static unsigned int ipmr_seq_read(struct net *net)
3022{
3023 ASSERT_RTNL();
3024
3025 return net->ipv4.ipmr_seq + ipmr_rules_seq_read(net);
3026}
3027
b7a59557
JP		 3028static int ipmr_dump(struct net *net, struct notifier_block *nb,
3029 struct netlink_ext_ack *extack)
4d65b948 3030{
cdc9f944 3031 return mr_dump(net, nb, RTNL_FAMILY_IPMR, ipmr_rules_dump,
194366b2 3032 ipmr_mr_table_iter, extack);
4d65b948
YG		 3033}
3034
3035static const struct fib_notifier_ops ipmr_notifier_ops_template = {
3036 .family = RTNL_FAMILY_IPMR,
3037 .fib_seq_read = ipmr_seq_read,
3038 .fib_dump = ipmr_dump,
3039 .owner = THIS_MODULE,
3040};
3041
ef739d8a 3042static int __net_init ipmr_notifier_init(struct net *net)
4d65b948
YG		 3043{
3044 struct fib_notifier_ops *ops;
3045
3046 net->ipv4.ipmr_seq = 0;
3047
3048 ops = fib_notifier_ops_register(&ipmr_notifier_ops_template, net);
3049 if (IS_ERR(ops))
3050 return PTR_ERR(ops);
3051 net->ipv4.ipmr_notifier_ops = ops;
3052
3053 return 0;
3054}
3055
3056static void __net_exit ipmr_notifier_exit(struct net *net)
3057{
3058 fib_notifier_ops_unregister(net->ipv4.ipmr_notifier_ops);
3059 net->ipv4.ipmr_notifier_ops = NULL;
3060}
3061
7ef8f65d 3062/* Setup for IP multicast routing */
cf958ae3
BT		 3063static int __net_init ipmr_net_init(struct net *net)
3064{
f0ad0860 3065 int err;
cf958ae3 3066
4d65b948
YG		 3067 err = ipmr_notifier_init(net);
3068 if (err)
3069 goto ipmr_notifier_fail;
3070
f0ad0860
PM		 3071 err = ipmr_rules_init(net);
3072 if (err < 0)
4d65b948 3073 goto ipmr_rules_fail;
f6bb4514
BT		 3074
3075#ifdef CONFIG_PROC_FS
3076 err = -ENOMEM;
c3506372
CH		 3077 if (!proc_create_net("ip_mr_vif", 0, net->proc_net, &ipmr_vif_seq_ops,
3078 sizeof(struct mr_vif_iter)))
f6bb4514 3079 goto proc_vif_fail;
c3506372
CH		 3080 if (!proc_create_net("ip_mr_cache", 0, net->proc_net, &ipmr_mfc_seq_ops,
3081 sizeof(struct mr_mfc_iter)))
f6bb4514
BT		 3082 goto proc_cache_fail;
3083#endif
2bb8b26c
BT		 3084 return 0;
3085
f6bb4514
BT		 3086#ifdef CONFIG_PROC_FS
3087proc_cache_fail:
ece31ffd 3088 remove_proc_entry("ip_mr_vif", net->proc_net);
f6bb4514 3089proc_vif_fail:
696e595f 3090 rtnl_lock();
f0ad0860 3091 ipmr_rules_exit(net);
696e595f 3092 rtnl_unlock();
f6bb4514 3093#endif
4d65b948
YG		 3094ipmr_rules_fail:
3095 ipmr_notifier_exit(net);
3096ipmr_notifier_fail:
cf958ae3
BT		 3097 return err;
3098}
3099
3100static void __net_exit ipmr_net_exit(struct net *net)
3101{
f6bb4514 3102#ifdef CONFIG_PROC_FS
ece31ffd
G		 3103 remove_proc_entry("ip_mr_cache", net->proc_net);
3104 remove_proc_entry("ip_mr_vif", net->proc_net);
f6bb4514 3105#endif
4d65b948 3106 ipmr_notifier_exit(net);
696e595f
ED		 3107}
3108
3109static void __net_exit ipmr_net_exit_batch(struct list_head *net_list)
3110{
3111 struct net *net;
3112
3113 rtnl_lock();
3114 list_for_each_entry(net, net_list, exit_list)
3115 ipmr_rules_exit(net);
3116 rtnl_unlock();
cf958ae3
BT		 3117}
3118
3119static struct pernet_operations ipmr_net_ops = {
3120 .init = ipmr_net_init,
3121 .exit = ipmr_net_exit,
696e595f 3122 .exit_batch = ipmr_net_exit_batch,
cf958ae3 3123};
e905a9ed 3124
03d2f897 3125int __init ip_mr_init(void)
1da177e4 3126{
03d2f897
WC		 3127 int err;
3128
1da177e4
LT		 3129 mrt_cachep = kmem_cache_create("ip_mrt_cache",
3130 sizeof(struct mfc_cache),
a8c9486b 3131 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC,
20c2df83 3132 NULL);
03d2f897 3133
cf958ae3
BT		 3134 err = register_pernet_subsys(&ipmr_net_ops);
3135 if (err)
3136 goto reg_pernet_fail;
3137
03d2f897
WC		 3138 err = register_netdevice_notifier(&ip_mr_notifier);
3139 if (err)
3140 goto reg_notif_fail;
403dbb97
TG		 3141#ifdef CONFIG_IP_PIMSM_V2
3142 if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) {
058bd4d2 3143 pr_err("%s: can't add PIM protocol\n", __func__);
403dbb97
TG		 3144 err = -EAGAIN;
3145 goto add_proto_fail;
3146 }
3147#endif
c7ac8679 3148 rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE,
b97bac64 3149 ipmr_rtm_getroute, ipmr_rtm_dumproute, 0);
ccbb0aa6 3150 rtnl_register(RTNL_FAMILY_IPMR, RTM_NEWROUTE,
b97bac64 3151 ipmr_rtm_route, NULL, 0);
ccbb0aa6 3152 rtnl_register(RTNL_FAMILY_IPMR, RTM_DELROUTE,
b97bac64 3153 ipmr_rtm_route, NULL, 0);
772c344d
NA		 3154
3155 rtnl_register(RTNL_FAMILY_IPMR, RTM_GETLINK,
b97bac64 3156 NULL, ipmr_rtm_dumplink, 0);
03d2f897 3157 return 0;
f6bb4514 3158
403dbb97
TG		 3159#ifdef CONFIG_IP_PIMSM_V2
3160add_proto_fail:
3161 unregister_netdevice_notifier(&ip_mr_notifier);
3162#endif
c3e38896 3163reg_notif_fail:
cf958ae3
BT		 3164 unregister_pernet_subsys(&ipmr_net_ops);
3165reg_pernet_fail:
c3e38896 3166 kmem_cache_destroy(mrt_cachep);
03d2f897 3167 return err;
1da177e4 3168}
Linux 6.x block layer and io_uring tree(s)