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Merge tag 'soc-drivers-6.9' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
[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
b4c1d4d9 256 err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT);
f0ad0860
PM		 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
bb740365
LF		 1028 mroute_sk = rcu_dereference(mrt->mroute_sk);
1029 if (!mroute_sk)
1030 return -EINVAL;
1031
c921c207 1032 if (assert == IGMPMSG_WHOLEPKT || assert == IGMPMSG_WRVIFWHOLE)
1da177e4
LT		 1033 skb = skb_realloc_headroom(pkt, sizeof(struct iphdr));
1034 else
1da177e4
LT		 1035 skb = alloc_skb(128, GFP_ATOMIC);
1036
132adf54 1037 if (!skb)
1da177e4
LT		 1038 return -ENOBUFS;
1039
c921c207 1040 if (assert == IGMPMSG_WHOLEPKT || assert == IGMPMSG_WRVIFWHOLE) {
1da177e4 1041 /* Ugly, but we have no choice with this interface.
a8cb16dd
ED		 1042 * Duplicate old header, fix ihl, length etc.
1043 * And all this only to mangle msg->im_msgtype and
1044 * to set msg->im_mbz to "mbz" :-)
1da177e4 1045 */
878c8145
ACM		 1046 skb_push(skb, sizeof(struct iphdr));
1047 skb_reset_network_header(skb);
badff6d0 1048 skb_reset_transport_header(skb);
0272ffc4 1049 msg = (struct igmpmsg *)skb_network_header(skb);
d56f90a7 1050 memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr));
c921c207 1051 msg->im_msgtype = assert;
1da177e4 1052 msg->im_mbz = 0;
c8715a8e 1053 if (assert == IGMPMSG_WRVIFWHOLE) {
c921c207 1054 msg->im_vif = vifi;
c8715a8e
PD		 1055 msg->im_vif_hi = vifi >> 8;
1056 } else {
64667988
ED		 1057 /* Pairs with WRITE_ONCE() in vif_add() and vif_delete() */
1058 int vif_num = READ_ONCE(mrt->mroute_reg_vif_num);
1059
1060 msg->im_vif = vif_num;
1061 msg->im_vif_hi = vif_num >> 8;
c8715a8e 1062 }
eddc9ec5
ACM		 1063 ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2;
1064 ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) +
1065 sizeof(struct iphdr));
c316c629
NA		 1066 } else {
1067 /* Copy the IP header */
1068 skb_set_network_header(skb, skb->len);
1069 skb_put(skb, ihl);
1070 skb_copy_to_linear_data(skb, pkt->data, ihl);
1071 /* Flag to the kernel this is a route add */
1072 ip_hdr(skb)->protocol = 0;
1073 msg = (struct igmpmsg *)skb_network_header(skb);
1074 msg->im_vif = vifi;
c8715a8e 1075 msg->im_vif_hi = vifi >> 8;
e622502c 1076 ipv4_pktinfo_prepare(mroute_sk, pkt, false);
bb740365 1077 memcpy(skb->cb, pkt->cb, sizeof(skb->cb));
c316c629 1078 /* Add our header */
4df864c1 1079 igmp = skb_put(skb, sizeof(struct igmphdr));
c316c629
NA		 1080 igmp->type = assert;
1081 msg->im_msgtype = assert;
1082 igmp->code = 0;
1083 ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */
1084 skb->transport_header = skb->network_header;
e905a9ed 1085 }
1da177e4 1086
5a645dd8
JG		 1087 igmpmsg_netlink_event(mrt, skb);
1088
a8cb16dd 1089 /* Deliver to mrouted */
4c968709 1090 ret = sock_queue_rcv_skb(mroute_sk, skb);
64667988 1091
70a269e6 1092 if (ret < 0) {
e87cc472 1093 net_warn_ratelimited("mroute: pending queue full, dropping entries\n");
1da177e4
LT		 1094 kfree_skb(skb);
1095 }
1096
1097 return ret;
1098}
1099
7ef8f65d 1100/* Queue a packet for resolution. It gets locked cache entry! */
64667988 1101/* Called under rcu_read_lock() */
7ef8f65d 1102static int ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi,
4b1f0d33 1103 struct sk_buff *skb, struct net_device *dev)
1da177e4 1104{
8fb472c0
NA		 1105 const struct iphdr *iph = ip_hdr(skb);
1106 struct mfc_cache *c;
862465f2 1107 bool found = false;
1da177e4 1108 int err;
1da177e4
LT		 1109
1110 spin_lock_bh(&mfc_unres_lock);
494fff56 1111 list_for_each_entry(c, &mrt->mfc_unres_queue, _c.list) {
e258beb2 1112 if (c->mfc_mcastgrp == iph->daddr &&
862465f2
PM		 1113 c->mfc_origin == iph->saddr) {
1114 found = true;
1da177e4 1115 break;
862465f2 1116 }
1da177e4
LT		 1117 }
1118
862465f2 1119 if (!found) {
a8cb16dd 1120 /* Create a new entry if allowable */
0079ad8e
HL		 1121 c = ipmr_cache_alloc_unres();
1122 if (!c) {
1da177e4
LT		 1123 spin_unlock_bh(&mfc_unres_lock);
1124
1125 kfree_skb(skb);
1126 return -ENOBUFS;
1127 }
1128
a8cb16dd 1129 /* Fill in the new cache entry */
494fff56 1130 c->_c.mfc_parent = -1;
eddc9ec5
ACM		 1131 c->mfc_origin = iph->saddr;
1132 c->mfc_mcastgrp = iph->daddr;
1da177e4 1133
a8cb16dd 1134 /* Reflect first query at mrouted. */
0c12295a 1135 err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE);
494fff56 1136
4feb88e5 1137 if (err < 0) {
e905a9ed 1138 /* If the report failed throw the cache entry
1da177e4
LT		 1139 out - Brad Parker
1140 */
1141 spin_unlock_bh(&mfc_unres_lock);
1142
5c0a66f5 1143 ipmr_cache_free(c);
1da177e4
LT		 1144 kfree_skb(skb);
1145 return err;
1146 }
1147
0c12295a 1148 atomic_inc(&mrt->cache_resolve_queue_len);
494fff56 1149 list_add(&c->_c.list, &mrt->mfc_unres_queue);
8cd3ac9f 1150 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1da177e4 1151
278554bd 1152 if (atomic_read(&mrt->cache_resolve_queue_len) == 1)
494fff56
YM		 1153 mod_timer(&mrt->ipmr_expire_timer,
1154 c->_c.mfc_un.unres.expires);
1da177e4
LT		 1155 }
1156
a8cb16dd 1157 /* See if we can append the packet */
494fff56 1158 if (c->_c.mfc_un.unres.unresolved.qlen > 3) {
1da177e4
LT		 1159 kfree_skb(skb);
1160 err = -ENOBUFS;
1161 } else {
4b1f0d33
DS		 1162 if (dev) {
1163 skb->dev = dev;
1164 skb->skb_iif = dev->ifindex;
1165 }
494fff56 1166 skb_queue_tail(&c->_c.mfc_un.unres.unresolved, skb);
1da177e4
LT		 1167 err = 0;
1168 }
1169
1170 spin_unlock_bh(&mfc_unres_lock);
1171 return err;
1172}
1173
7ef8f65d 1174/* MFC cache manipulation by user space mroute daemon */
1da177e4 1175
660b26dc 1176static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent)
1da177e4 1177{
b362053a 1178 struct net *net = read_pnet(&mrt->net);
8fb472c0 1179 struct mfc_cache *c;
1da177e4 1180
8fb472c0
NA		 1181 /* The entries are added/deleted only under RTNL */
1182 rcu_read_lock();
1183 c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr,
1184 mfc->mfcc_mcastgrp.s_addr, parent);
1185 rcu_read_unlock();
1186 if (!c)
1187 return -ENOENT;
494fff56
YM		 1188 rhltable_remove(&mrt->mfc_hash, &c->_c.mnode, ipmr_rht_params);
1189 list_del_rcu(&c->_c.list);
b362053a 1190 call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, c, mrt->id);
8fb472c0 1191 mroute_netlink_event(mrt, c, RTM_DELROUTE);
8c13af2a 1192 mr_cache_put(&c->_c);
1da177e4 1193
8fb472c0 1194 return 0;
1da177e4
LT		 1195}
1196
0c12295a 1197static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
660b26dc 1198 struct mfcctl *mfc, int mrtsock, int parent)
1da177e4 1199{
862465f2 1200 struct mfc_cache *uc, *c;
494fff56 1201 struct mr_mfc *_uc;
8fb472c0
NA		 1202 bool found;
1203 int ret;
1da177e4 1204
a50436f2
PM		 1205 if (mfc->mfcc_parent >= MAXVIFS)
1206 return -ENFILE;
1207
8fb472c0
NA		 1208 /* The entries are added/deleted only under RTNL */
1209 rcu_read_lock();
1210 c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr,
1211 mfc->mfcc_mcastgrp.s_addr, parent);
1212 rcu_read_unlock();
1213 if (c) {
3f55211e 1214 spin_lock(&mrt_lock);
494fff56
YM		 1215 c->_c.mfc_parent = mfc->mfcc_parent;
1216 ipmr_update_thresholds(mrt, &c->_c, mfc->mfcc_ttls);
1da177e4 1217 if (!mrtsock)
494fff56 1218 c->_c.mfc_flags |= MFC_STATIC;
3f55211e 1219 spin_unlock(&mrt_lock);
b362053a
YG		 1220 call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE, c,
1221 mrt->id);
8cd3ac9f 1222 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1da177e4
LT		 1223 return 0;
1224 }
1225
360eb5da 1226 if (mfc->mfcc_mcastgrp.s_addr != htonl(INADDR_ANY) &&
660b26dc 1227 !ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr))
1da177e4
LT		 1228 return -EINVAL;
1229
d658f8a0 1230 c = ipmr_cache_alloc();
51456b29 1231 if (!c)
1da177e4
LT		 1232 return -ENOMEM;
1233
c354e124
JK		 1234 c->mfc_origin = mfc->mfcc_origin.s_addr;
1235 c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr;
494fff56
YM		 1236 c->_c.mfc_parent = mfc->mfcc_parent;
1237 ipmr_update_thresholds(mrt, &c->_c, mfc->mfcc_ttls);
1da177e4 1238 if (!mrtsock)
494fff56 1239 c->_c.mfc_flags |= MFC_STATIC;
1da177e4 1240
494fff56 1241 ret = rhltable_insert_key(&mrt->mfc_hash, &c->cmparg, &c->_c.mnode,
8fb472c0
NA		 1242 ipmr_rht_params);
1243 if (ret) {
1244 pr_err("ipmr: rhtable insert error %d\n", ret);
1245 ipmr_cache_free(c);
1246 return ret;
1247 }
494fff56 1248 list_add_tail_rcu(&c->_c.list, &mrt->mfc_cache_list);
7ef8f65d
NA		 1249 /* Check to see if we resolved a queued list. If so we
1250 * need to send on the frames and tidy up.
1da177e4 1251 */
b0ebb739 1252 found = false;
1da177e4 1253 spin_lock_bh(&mfc_unres_lock);
494fff56
YM		 1254 list_for_each_entry(_uc, &mrt->mfc_unres_queue, list) {
1255 uc = (struct mfc_cache *)_uc;
e258beb2 1256 if (uc->mfc_origin == c->mfc_origin &&
1da177e4 1257 uc->mfc_mcastgrp == c->mfc_mcastgrp) {
494fff56 1258 list_del(&_uc->list);
0c12295a 1259 atomic_dec(&mrt->cache_resolve_queue_len);
b0ebb739 1260 found = true;
1da177e4
LT		 1261 break;
1262 }
1263 }
0c12295a
PM		 1264 if (list_empty(&mrt->mfc_unres_queue))
1265 del_timer(&mrt->ipmr_expire_timer);
1da177e4
LT		 1266 spin_unlock_bh(&mfc_unres_lock);
1267
b0ebb739 1268 if (found) {
0c12295a 1269 ipmr_cache_resolve(net, mrt, uc, c);
5c0a66f5 1270 ipmr_cache_free(uc);
1da177e4 1271 }
b362053a 1272 call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_ADD, c, mrt->id);
8cd3ac9f 1273 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1da177e4
LT		 1274 return 0;
1275}
1276
7ef8f65d 1277/* Close the multicast socket, and clear the vif tables etc */
ca8d4794 1278static void mroute_clean_tables(struct mr_table *mrt, int flags)
1da177e4 1279{
b362053a 1280 struct net *net = read_pnet(&mrt->net);
494fff56
YM		 1281 struct mr_mfc *c, *tmp;
1282 struct mfc_cache *cache;
d17fa6fa 1283 LIST_HEAD(list);
8fb472c0 1284 int i;
e905a9ed 1285
a8cb16dd 1286 /* Shut down all active vif entries */
ca8d4794
CS		 1287 if (flags & (MRT_FLUSH_VIFS | MRT_FLUSH_VIFS_STATIC)) {
1288 for (i = 0; i < mrt->maxvif; i++) {
1289 if (((mrt->vif_table[i].flags & VIFF_STATIC) &&
1290 !(flags & MRT_FLUSH_VIFS_STATIC)) ||
1291 (!(mrt->vif_table[i].flags & VIFF_STATIC) && !(flags & MRT_FLUSH_VIFS)))
1292 continue;
1293 vif_delete(mrt, i, 0, &list);
1294 }
1295 unregister_netdevice_many(&list);
1da177e4
LT		 1296 }
1297
a8cb16dd 1298 /* Wipe the cache */
ca8d4794
CS		 1299 if (flags & (MRT_FLUSH_MFC | MRT_FLUSH_MFC_STATIC)) {
1300 list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) {
1301 if (((c->mfc_flags & MFC_STATIC) && !(flags & MRT_FLUSH_MFC_STATIC)) ||
1302 (!(c->mfc_flags & MFC_STATIC) && !(flags & MRT_FLUSH_MFC)))
1303 continue;
1304 rhltable_remove(&mrt->mfc_hash, &c->mnode, ipmr_rht_params);
1305 list_del_rcu(&c->list);
494fff56 1306 cache = (struct mfc_cache *)c;
ca8d4794
CS		 1307 call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, cache,
1308 mrt->id);
494fff56 1309 mroute_netlink_event(mrt, cache, RTM_DELROUTE);
ca8d4794
CS		 1310 mr_cache_put(c);
1311 }
1312 }
1313
1314 if (flags & MRT_FLUSH_MFC) {
1315 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1316 spin_lock_bh(&mfc_unres_lock);
1317 list_for_each_entry_safe(c, tmp, &mrt->mfc_unres_queue, list) {
1318 list_del(&c->list);
1319 cache = (struct mfc_cache *)c;
1320 mroute_netlink_event(mrt, cache, RTM_DELROUTE);
1321 ipmr_destroy_unres(mrt, cache);
1322 }
1323 spin_unlock_bh(&mfc_unres_lock);
1da177e4 1324 }
1da177e4
LT		 1325 }
1326}
1327
4c968709 1328/* called from ip_ra_control(), before an RCU grace period,
974d8f86 1329 * we don't need to call synchronize_rcu() here
4c968709 1330 */
1da177e4
LT		 1331static void mrtsock_destruct(struct sock *sk)
1332{
4feb88e5 1333 struct net *net = sock_net(sk);
f0ad0860 1334 struct mr_table *mrt;
4feb88e5 1335
128aaa98 1336 rtnl_lock();
f0ad0860 1337 ipmr_for_each_table(mrt, net) {
4c968709 1338 if (sk == rtnl_dereference(mrt->mroute_sk)) {
f0ad0860 1339 IPV4_DEVCONF_ALL(net, MC_FORWARDING)--;
3b022865
DA		 1340 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
1341 NETCONFA_MC_FORWARDING,
d67b8c61
ND		 1342 NETCONFA_IFINDEX_ALL,
1343 net->ipv4.devconf_all);
a9b3cd7f 1344 RCU_INIT_POINTER(mrt->mroute_sk, NULL);
ca8d4794 1345 mroute_clean_tables(mrt, MRT_FLUSH_VIFS | MRT_FLUSH_MFC);
f0ad0860 1346 }
1da177e4 1347 }
128aaa98 1348 rtnl_unlock();
1da177e4
LT		 1349}
1350
7ef8f65d
NA		 1351/* Socket options and virtual interface manipulation. The whole
1352 * virtual interface system is a complete heap, but unfortunately
1353 * that's how BSD mrouted happens to think. Maybe one day with a proper
1354 * MOSPF/PIM router set up we can clean this up.
1da177e4 1355 */
e905a9ed 1356
01ccb5b4 1357int ip_mroute_setsockopt(struct sock *sk, int optname, sockptr_t optval,
29e97d21 1358 unsigned int optlen)
1da177e4 1359{
4feb88e5 1360 struct net *net = sock_net(sk);
29e97d21 1361 int val, ret = 0, parent = 0;
f0ad0860 1362 struct mr_table *mrt;
29e97d21
NA		 1363 struct vifctl vif;
1364 struct mfcctl mfc;
c921c207 1365 bool do_wrvifwhole;
29e97d21 1366 u32 uval;
f0ad0860 1367
29e97d21
NA		 1368 /* There's one exception to the lock - MRT_DONE which needs to unlock */
1369 rtnl_lock();
5e1859fb 1370 if (sk->sk_type != SOCK_RAW ||
29e97d21
NA		 1371 inet_sk(sk)->inet_num != IPPROTO_IGMP) {
1372 ret = -EOPNOTSUPP;
1373 goto out_unlock;
1374 }
5e1859fb 1375
f0ad0860 1376 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
29e97d21
NA		 1377 if (!mrt) {
1378 ret = -ENOENT;
1379 goto out_unlock;
1380 }
132adf54 1381 if (optname != MRT_INIT) {
33d480ce 1382 if (sk != rcu_access_pointer(mrt->mroute_sk) &&
29e97d21
NA		 1383 !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
1384 ret = -EACCES;
1385 goto out_unlock;
1386 }
1da177e4
LT		 1387 }
1388
132adf54
SH		 1389 switch (optname) {
1390 case MRT_INIT:
42e6b89c 1391 if (optlen != sizeof(int)) {
29e97d21 1392 ret = -EINVAL;
42e6b89c
NA		 1393 break;
1394 }
1395 if (rtnl_dereference(mrt->mroute_sk)) {
29e97d21 1396 ret = -EADDRINUSE;
29e97d21 1397 break;
42e6b89c 1398 }
132adf54
SH		 1399
1400 ret = ip_ra_control(sk, 1, mrtsock_destruct);
1401 if (ret == 0) {
cf778b00 1402 rcu_assign_pointer(mrt->mroute_sk, sk);
4feb88e5 1403 IPV4_DEVCONF_ALL(net, MC_FORWARDING)++;
3b022865
DA		 1404 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
1405 NETCONFA_MC_FORWARDING,
d67b8c61
ND		 1406 NETCONFA_IFINDEX_ALL,
1407 net->ipv4.devconf_all);
132adf54 1408 }
29e97d21 1409 break;
132adf54 1410 case MRT_DONE:
29e97d21
NA		 1411 if (sk != rcu_access_pointer(mrt->mroute_sk)) {
1412 ret = -EACCES;
1413 } else {
128aaa98
KT		 1414 /* We need to unlock here because mrtsock_destruct takes
1415 * care of rtnl itself and we can't change that due to
1416 * the IP_ROUTER_ALERT setsockopt which runs without it.
1417 */
1418 rtnl_unlock();
29e97d21 1419 ret = ip_ra_control(sk, 0, NULL);
128aaa98 1420 goto out;
29e97d21
NA		 1421 }
1422 break;
132adf54
SH		 1423 case MRT_ADD_VIF:
1424 case MRT_DEL_VIF:
29e97d21
NA		 1425 if (optlen != sizeof(vif)) {
1426 ret = -EINVAL;
1427 break;
1428 }
01ccb5b4 1429 if (copy_from_sockptr(&vif, optval, sizeof(vif))) {
29e97d21
NA		 1430 ret = -EFAULT;
1431 break;
1432 }
1433 if (vif.vifc_vifi >= MAXVIFS) {
1434 ret = -ENFILE;
1435 break;
1436 }
c354e124 1437 if (optname == MRT_ADD_VIF) {
4c968709
ED		 1438 ret = vif_add(net, mrt, &vif,
1439 sk == rtnl_dereference(mrt->mroute_sk));
132adf54 1440 } else {
0c12295a 1441 ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL);
132adf54 1442 }
29e97d21 1443 break;
7ef8f65d
NA		 1444 /* Manipulate the forwarding caches. These live
1445 * in a sort of kernel/user symbiosis.
1446 */
132adf54
SH		 1447 case MRT_ADD_MFC:
1448 case MRT_DEL_MFC:
660b26dc 1449 parent = -1;
a8eceea8 1450 fallthrough;
660b26dc
ND		 1451 case MRT_ADD_MFC_PROXY:
1452 case MRT_DEL_MFC_PROXY:
29e97d21
NA		 1453 if (optlen != sizeof(mfc)) {
1454 ret = -EINVAL;
1455 break;
1456 }
73cb1193 1457 if (copy_from_sockptr(&mfc, optval, sizeof(mfc))) {
29e97d21
NA		 1458 ret = -EFAULT;
1459 break;
1460 }
660b26dc
ND		 1461 if (parent == 0)
1462 parent = mfc.mfcc_parent;
660b26dc
ND		 1463 if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY)
1464 ret = ipmr_mfc_delete(mrt, &mfc, parent);
132adf54 1465 else
4c968709 1466 ret = ipmr_mfc_add(net, mrt, &mfc,
660b26dc
ND		 1467 sk == rtnl_dereference(mrt->mroute_sk),
1468 parent);
29e97d21 1469 break;
ca8d4794
CS		 1470 case MRT_FLUSH:
1471 if (optlen != sizeof(val)) {
1472 ret = -EINVAL;
1473 break;
1474 }
01ccb5b4 1475 if (copy_from_sockptr(&val, optval, sizeof(val))) {
ca8d4794
CS		 1476 ret = -EFAULT;
1477 break;
1478 }
1479 mroute_clean_tables(mrt, val);
1480 break;
7ef8f65d 1481 /* Control PIM assert. */
132adf54 1482 case MRT_ASSERT:
29e97d21
NA		 1483 if (optlen != sizeof(val)) {
1484 ret = -EINVAL;
1485 break;
1486 }
01ccb5b4 1487 if (copy_from_sockptr(&val, optval, sizeof(val))) {
29e97d21
NA		 1488 ret = -EFAULT;
1489 break;
1490 }
1491 mrt->mroute_do_assert = val;
1492 break;
132adf54 1493 case MRT_PIM:
1973a4ea 1494 if (!ipmr_pimsm_enabled()) {
29e97d21
NA		 1495 ret = -ENOPROTOOPT;
1496 break;
1497 }
1498 if (optlen != sizeof(val)) {
1499 ret = -EINVAL;
1500 break;
1501 }
01ccb5b4 1502 if (copy_from_sockptr(&val, optval, sizeof(val))) {
29e97d21
NA		 1503 ret = -EFAULT;
1504 break;
1505 }
ba93ef74 1506
c921c207 1507 do_wrvifwhole = (val == IGMPMSG_WRVIFWHOLE);
29e97d21
NA		 1508 val = !!val;
1509 if (val != mrt->mroute_do_pim) {
1510 mrt->mroute_do_pim = val;
1511 mrt->mroute_do_assert = val;
c921c207 1512 mrt->mroute_do_wrvifwhole = do_wrvifwhole;
1da177e4 1513 }
29e97d21 1514 break;
f0ad0860 1515 case MRT_TABLE:
29e97d21
NA		 1516 if (!IS_BUILTIN(CONFIG_IP_MROUTE_MULTIPLE_TABLES)) {
1517 ret = -ENOPROTOOPT;
1518 break;
1519 }
1520 if (optlen != sizeof(uval)) {
1521 ret = -EINVAL;
1522 break;
1523 }
01ccb5b4 1524 if (copy_from_sockptr(&uval, optval, sizeof(uval))) {
29e97d21
NA		 1525 ret = -EFAULT;
1526 break;
1527 }
f0ad0860 1528
4c968709
ED		 1529 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1530 ret = -EBUSY;
1531 } else {
29e97d21 1532 mrt = ipmr_new_table(net, uval);
1113ebbc
NA		 1533 if (IS_ERR(mrt))
1534 ret = PTR_ERR(mrt);
5e1859fb 1535 else
29e97d21 1536 raw_sk(sk)->ipmr_table = uval;
4c968709 1537 }
29e97d21 1538 break;
7ef8f65d 1539 /* Spurious command, or MRT_VERSION which you cannot set. */
132adf54 1540 default:
29e97d21 1541 ret = -ENOPROTOOPT;
1da177e4 1542 }
29e97d21
NA		 1543out_unlock:
1544 rtnl_unlock();
128aaa98 1545out:
29e97d21 1546 return ret;
1da177e4
LT		 1547}
1548
e1d001fa
BL		 1549/* Execute if this ioctl is a special mroute ioctl */
1550int ipmr_sk_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1551{
1552 switch (cmd) {
1553 /* These userspace buffers will be consumed by ipmr_ioctl() */
1554 case SIOCGETVIFCNT: {
1555 struct sioc_vif_req buffer;
1556
1557 return sock_ioctl_inout(sk, cmd, arg, &buffer,
1558 sizeof(buffer));
1559 }
1560 case SIOCGETSGCNT: {
1561 struct sioc_sg_req buffer;
1562
1563 return sock_ioctl_inout(sk, cmd, arg, &buffer,
1564 sizeof(buffer));
1565 }
1566 }
1567 /* return code > 0 means that the ioctl was not executed */
1568 return 1;
1569}
1570
7ef8f65d 1571/* Getsock opt support for the multicast routing system. */
728f064c
MKL		 1572int ip_mroute_getsockopt(struct sock *sk, int optname, sockptr_t optval,
1573 sockptr_t optlen)
1da177e4
LT		 1574{
1575 int olr;
1576 int val;
4feb88e5 1577 struct net *net = sock_net(sk);
f0ad0860
PM		 1578 struct mr_table *mrt;
1579
5e1859fb
ED		 1580 if (sk->sk_type != SOCK_RAW ||
1581 inet_sk(sk)->inet_num != IPPROTO_IGMP)
1582 return -EOPNOTSUPP;
1583
f0ad0860 1584 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
51456b29 1585 if (!mrt)
f0ad0860 1586 return -ENOENT;
1da177e4 1587
fe9ef3ce
NA		 1588 switch (optname) {
1589 case MRT_VERSION:
1590 val = 0x0305;
1591 break;
1592 case MRT_PIM:
1973a4ea 1593 if (!ipmr_pimsm_enabled())
fe9ef3ce
NA		 1594 return -ENOPROTOOPT;
1595 val = mrt->mroute_do_pim;
1596 break;
1597 case MRT_ASSERT:
1598 val = mrt->mroute_do_assert;
1599 break;
1600 default:
1da177e4 1601 return -ENOPROTOOPT;
fe9ef3ce 1602 }
1da177e4 1603
728f064c 1604 if (copy_from_sockptr(&olr, optlen, sizeof(int)))
1da177e4 1605 return -EFAULT;
1da177e4
LT		 1606 olr = min_t(unsigned int, olr, sizeof(int));
1607 if (olr < 0)
1608 return -EINVAL;
728f064c 1609 if (copy_to_sockptr(optlen, &olr, sizeof(int)))
1da177e4 1610 return -EFAULT;
728f064c 1611 if (copy_to_sockptr(optval, &val, olr))
1da177e4
LT		 1612 return -EFAULT;
1613 return 0;
1614}
1615
7ef8f65d 1616/* The IP multicast ioctl support routines. */
e1d001fa 1617int ipmr_ioctl(struct sock *sk, int cmd, void *arg)
1da177e4 1618{
1da177e4
LT		 1619 struct vif_device *vif;
1620 struct mfc_cache *c;
4feb88e5 1621 struct net *net = sock_net(sk);
e1d001fa
BL		 1622 struct sioc_vif_req *vr;
1623 struct sioc_sg_req *sr;
f0ad0860
PM		 1624 struct mr_table *mrt;
1625
1626 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
51456b29 1627 if (!mrt)
f0ad0860 1628 return -ENOENT;
e905a9ed 1629
132adf54
SH		 1630 switch (cmd) {
1631 case SIOCGETVIFCNT:
e1d001fa
BL		 1632 vr = (struct sioc_vif_req *)arg;
1633 if (vr->vifi >= mrt->maxvif)
132adf54 1634 return -EINVAL;
e1d001fa 1635 vr->vifi = array_index_nospec(vr->vifi, mrt->maxvif);
559260fd 1636 rcu_read_lock();
e1d001fa
BL		 1637 vif = &mrt->vif_table[vr->vifi];
1638 if (VIF_EXISTS(mrt, vr->vifi)) {
1639 vr->icount = READ_ONCE(vif->pkt_in);
1640 vr->ocount = READ_ONCE(vif->pkt_out);
1641 vr->ibytes = READ_ONCE(vif->bytes_in);
1642 vr->obytes = READ_ONCE(vif->bytes_out);
559260fd 1643 rcu_read_unlock();
1da177e4 1644
132adf54
SH		 1645 return 0;
1646 }
559260fd 1647 rcu_read_unlock();
132adf54
SH		 1648 return -EADDRNOTAVAIL;
1649 case SIOCGETSGCNT:
e1d001fa 1650 sr = (struct sioc_sg_req *)arg;
132adf54 1651
a8c9486b 1652 rcu_read_lock();
e1d001fa 1653 c = ipmr_cache_find(mrt, sr->src.s_addr, sr->grp.s_addr);
132adf54 1654 if (c) {
e1d001fa
BL		 1655 sr->pktcnt = c->_c.mfc_un.res.pkt;
1656 sr->bytecnt = c->_c.mfc_un.res.bytes;
1657 sr->wrong_if = c->_c.mfc_un.res.wrong_if;
a8c9486b 1658 rcu_read_unlock();
132adf54
SH		 1659 return 0;
1660 }
a8c9486b 1661 rcu_read_unlock();
132adf54
SH		 1662 return -EADDRNOTAVAIL;
1663 default:
1664 return -ENOIOCTLCMD;
1da177e4
LT		 1665 }
1666}
1667
709b46e8
EB		 1668#ifdef CONFIG_COMPAT
1669struct compat_sioc_sg_req {
1670 struct in_addr src;
1671 struct in_addr grp;
1672 compat_ulong_t pktcnt;
1673 compat_ulong_t bytecnt;
1674 compat_ulong_t wrong_if;
1675};
1676
ca6b8bb0
DM		 1677struct compat_sioc_vif_req {
1678 vifi_t vifi; /* Which iface */
1679 compat_ulong_t icount;
1680 compat_ulong_t ocount;
1681 compat_ulong_t ibytes;
1682 compat_ulong_t obytes;
1683};
1684
709b46e8
EB		 1685int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1686{
0033d5ad 1687 struct compat_sioc_sg_req sr;
ca6b8bb0
DM		 1688 struct compat_sioc_vif_req vr;
1689 struct vif_device *vif;
709b46e8
EB		 1690 struct mfc_cache *c;
1691 struct net *net = sock_net(sk);
1692 struct mr_table *mrt;
1693
1694 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
51456b29 1695 if (!mrt)
709b46e8
EB		 1696 return -ENOENT;
1697
1698 switch (cmd) {
ca6b8bb0
DM		 1699 case SIOCGETVIFCNT:
1700 if (copy_from_user(&vr, arg, sizeof(vr)))
1701 return -EFAULT;
1702 if (vr.vifi >= mrt->maxvif)
1703 return -EINVAL;
5648451e 1704 vr.vifi = array_index_nospec(vr.vifi, mrt->maxvif);
559260fd 1705 rcu_read_lock();
ca6b8bb0
DM		 1706 vif = &mrt->vif_table[vr.vifi];
1707 if (VIF_EXISTS(mrt, vr.vifi)) {
559260fd
ED		 1708 vr.icount = READ_ONCE(vif->pkt_in);
1709 vr.ocount = READ_ONCE(vif->pkt_out);
1710 vr.ibytes = READ_ONCE(vif->bytes_in);
1711 vr.obytes = READ_ONCE(vif->bytes_out);
1712 rcu_read_unlock();
ca6b8bb0
DM		 1713
1714 if (copy_to_user(arg, &vr, sizeof(vr)))
1715 return -EFAULT;
1716 return 0;
1717 }
559260fd 1718 rcu_read_unlock();
ca6b8bb0 1719 return -EADDRNOTAVAIL;
709b46e8
EB		 1720 case SIOCGETSGCNT:
1721 if (copy_from_user(&sr, arg, sizeof(sr)))
1722 return -EFAULT;
1723
1724 rcu_read_lock();
1725 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
1726 if (c) {
494fff56
YM		 1727 sr.pktcnt = c->_c.mfc_un.res.pkt;
1728 sr.bytecnt = c->_c.mfc_un.res.bytes;
1729 sr.wrong_if = c->_c.mfc_un.res.wrong_if;
709b46e8
EB		 1730 rcu_read_unlock();
1731
1732 if (copy_to_user(arg, &sr, sizeof(sr)))
1733 return -EFAULT;
1734 return 0;
1735 }
1736 rcu_read_unlock();
1737 return -EADDRNOTAVAIL;
1738 default:
1739 return -ENOIOCTLCMD;
1740 }
1741}
1742#endif
1743
1da177e4
LT		 1744static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
1745{
351638e7 1746 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4feb88e5 1747 struct net *net = dev_net(dev);
f0ad0860 1748 struct mr_table *mrt;
1da177e4
LT		 1749 struct vif_device *v;
1750 int ct;
e9dc8653 1751
1da177e4
LT		 1752 if (event != NETDEV_UNREGISTER)
1753 return NOTIFY_DONE;
f0ad0860
PM		 1754
1755 ipmr_for_each_table(mrt, net) {
1756 v = &mrt->vif_table[0];
1757 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
ebc31979 1758 if (rcu_access_pointer(v->dev) == dev)
e92036a6 1759 vif_delete(mrt, ct, 1, NULL);
f0ad0860 1760 }
1da177e4
LT		 1761 }
1762 return NOTIFY_DONE;
1763}
1764
c354e124 1765static struct notifier_block ip_mr_notifier = {
1da177e4
LT		 1766 .notifier_call = ipmr_device_event,
1767};
1768
7ef8f65d
NA		 1769/* Encapsulate a packet by attaching a valid IPIP header to it.
1770 * This avoids tunnel drivers and other mess and gives us the speed so
1771 * important for multicast video.
1da177e4 1772 */
b6a7719a
HFS		 1773static void ip_encap(struct net *net, struct sk_buff *skb,
1774 __be32 saddr, __be32 daddr)
1da177e4 1775{
8856dfa3 1776 struct iphdr *iph;
b71d1d42 1777 const struct iphdr *old_iph = ip_hdr(skb);
8856dfa3
ACM		 1778
1779 skb_push(skb, sizeof(struct iphdr));
b0e380b1 1780 skb->transport_header = skb->network_header;
8856dfa3 1781 skb_reset_network_header(skb);
eddc9ec5 1782 iph = ip_hdr(skb);
1da177e4 1783
a8cb16dd 1784 iph->version = 4;
e023dd64
ACM		 1785 iph->tos = old_iph->tos;
1786 iph->ttl = old_iph->ttl;
1da177e4
LT		 1787 iph->frag_off = 0;
1788 iph->daddr = daddr;
1789 iph->saddr = saddr;
1790 iph->protocol = IPPROTO_IPIP;
1791 iph->ihl = 5;
1792 iph->tot_len = htons(skb->len);
b6a7719a 1793 ip_select_ident(net, skb, NULL);
1da177e4
LT		 1794 ip_send_check(iph);
1795
1da177e4 1796 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
895b5c9f 1797 nf_reset_ct(skb);
1da177e4
LT		 1798}
1799
0c4b51f0
EB		 1800static inline int ipmr_forward_finish(struct net *net, struct sock *sk,
1801 struct sk_buff *skb)
1da177e4 1802{
a8cb16dd 1803 struct ip_options *opt = &(IPCB(skb)->opt);
1da177e4 1804
73186df8 1805 IP_INC_STATS(net, IPSTATS_MIB_OUTFORWDATAGRAMS);
1da177e4
LT		 1806
1807 if (unlikely(opt->optlen))
1808 ip_forward_options(skb);
1809
13206b6b 1810 return dst_output(net, sk, skb);
1da177e4
LT		 1811}
1812
a5bc9294
YG		 1813#ifdef CONFIG_NET_SWITCHDEV
1814static bool ipmr_forward_offloaded(struct sk_buff *skb, struct mr_table *mrt,
1815 int in_vifi, int out_vifi)
1816{
1817 struct vif_device *out_vif = &mrt->vif_table[out_vifi];
1818 struct vif_device *in_vif = &mrt->vif_table[in_vifi];
1819
875e8939 1820 if (!skb->offload_l3_fwd_mark)
a5bc9294
YG		 1821 return false;
1822 if (!out_vif->dev_parent_id.id_len || !in_vif->dev_parent_id.id_len)
1823 return false;
1824 return netdev_phys_item_id_same(&out_vif->dev_parent_id,
1825 &in_vif->dev_parent_id);
1826}
1827#else
1828static bool ipmr_forward_offloaded(struct sk_buff *skb, struct mr_table *mrt,
1829 int in_vifi, int out_vifi)
1830{
1831 return false;
1832}
1833#endif
1834
4eadb882 1835/* Processing handlers for ipmr_forward, under rcu_read_lock() */
1da177e4 1836
0c12295a 1837static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
6e0735d1 1838 int in_vifi, struct sk_buff *skb, int vifi)
1da177e4 1839{
eddc9ec5 1840 const struct iphdr *iph = ip_hdr(skb);
0c12295a 1841 struct vif_device *vif = &mrt->vif_table[vifi];
ebc31979 1842 struct net_device *vif_dev;
1da177e4
LT		 1843 struct net_device *dev;
1844 struct rtable *rt;
31e4543d 1845 struct flowi4 fl4;
1da177e4
LT		 1846 int encap = 0;
1847
ebc31979
ED		 1848 vif_dev = vif_dev_read(vif);
1849 if (!vif_dev)
1da177e4
LT		 1850 goto out_free;
1851
1da177e4 1852 if (vif->flags & VIFF_REGISTER) {
559260fd
ED		 1853 WRITE_ONCE(vif->pkt_out, vif->pkt_out + 1);
1854 WRITE_ONCE(vif->bytes_out, vif->bytes_out + skb->len);
c4794d22
ED		 1855 DEV_STATS_ADD(vif_dev, tx_bytes, skb->len);
1856 DEV_STATS_INC(vif_dev, tx_packets);
0c12295a 1857 ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT);
69ebbf58 1858 goto out_free;
1da177e4 1859 }
1da177e4 1860
a5bc9294
YG		 1861 if (ipmr_forward_offloaded(skb, mrt, in_vifi, vifi))
1862 goto out_free;
1863
a8cb16dd 1864 if (vif->flags & VIFF_TUNNEL) {
31e4543d 1865 rt = ip_route_output_ports(net, &fl4, NULL,
78fbfd8a
DM		 1866 vif->remote, vif->local,
1867 0, 0,
1868 IPPROTO_IPIP,
1869 RT_TOS(iph->tos), vif->link);
b23dd4fe 1870 if (IS_ERR(rt))
1da177e4
LT		 1871 goto out_free;
1872 encap = sizeof(struct iphdr);
1873 } else {
31e4543d 1874 rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0,
78fbfd8a
DM		 1875 0, 0,
1876 IPPROTO_IPIP,
1877 RT_TOS(iph->tos), vif->link);
b23dd4fe 1878 if (IS_ERR(rt))
1da177e4
LT		 1879 goto out_free;
1880 }
1881
d8d1f30b 1882 dev = rt->dst.dev;
1da177e4 1883
d8d1f30b 1884 if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) {
1da177e4 1885 /* Do not fragment multicasts. Alas, IPv4 does not
a8cb16dd
ED		 1886 * allow to send ICMP, so that packets will disappear
1887 * to blackhole.
1da177e4 1888 */
73186df8 1889 IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS);
1da177e4
LT		 1890 ip_rt_put(rt);
1891 goto out_free;
1892 }
1893
d8d1f30b 1894 encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len;
1da177e4
LT		 1895
1896 if (skb_cow(skb, encap)) {
e905a9ed 1897 ip_rt_put(rt);
1da177e4
LT		 1898 goto out_free;
1899 }
1900
559260fd
ED		 1901 WRITE_ONCE(vif->pkt_out, vif->pkt_out + 1);
1902 WRITE_ONCE(vif->bytes_out, vif->bytes_out + skb->len);
1da177e4 1903
adf30907 1904 skb_dst_drop(skb);
d8d1f30b 1905 skb_dst_set(skb, &rt->dst);
eddc9ec5 1906 ip_decrease_ttl(ip_hdr(skb));
1da177e4
LT		 1907
1908 /* FIXME: forward and output firewalls used to be called here.
a8cb16dd
ED		 1909 * What do we do with netfilter? -- RR
1910 */
1da177e4 1911 if (vif->flags & VIFF_TUNNEL) {
b6a7719a 1912 ip_encap(net, skb, vif->local, vif->remote);
1da177e4 1913 /* FIXME: extra output firewall step used to be here. --RR */
c4794d22
ED		 1914 DEV_STATS_INC(vif_dev, tx_packets);
1915 DEV_STATS_ADD(vif_dev, tx_bytes, skb->len);
1da177e4
LT		 1916 }
1917
9ee6c5dc 1918 IPCB(skb)->flags |= IPSKB_FORWARDED;
1da177e4 1919
7ef8f65d 1920 /* RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
1da177e4
LT		 1921 * not only before forwarding, but after forwarding on all output
1922 * interfaces. It is clear, if mrouter runs a multicasting
1923 * program, it should receive packets not depending to what interface
1924 * program is joined.
1925 * If we will not make it, the program will have to join on all
1926 * interfaces. On the other hand, multihoming host (or router, but
1927 * not mrouter) cannot join to more than one interface - it will
1928 * result in receiving multiple packets.
1929 */
29a26a56
EB		 1930 NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD,
1931 net, NULL, skb, skb->dev, dev,
1da177e4
LT		 1932 ipmr_forward_finish);
1933 return;
1934
1935out_free:
1936 kfree_skb(skb);
1da177e4
LT		 1937}
1938
9094db4b
ED		 1939/* Called with mrt_lock or rcu_read_lock() */
1940static int ipmr_find_vif(const struct mr_table *mrt, struct net_device *dev)
1da177e4
LT		 1941{
1942 int ct;
9094db4b
ED		 1943 /* Pairs with WRITE_ONCE() in vif_delete()/vif_add() */
1944 for (ct = READ_ONCE(mrt->maxvif) - 1; ct >= 0; ct--) {
ebc31979 1945 if (rcu_access_pointer(mrt->vif_table[ct].dev) == dev)
1da177e4
LT		 1946 break;
1947 }
1948 return ct;
1949}
1950
1951/* "local" means that we should preserve one skb (for local delivery) */
4eadb882 1952/* Called uner rcu_read_lock() */
c4854ec8 1953static void ip_mr_forward(struct net *net, struct mr_table *mrt,
4b1f0d33 1954 struct net_device *dev, struct sk_buff *skb,
494fff56 1955 struct mfc_cache *c, int local)
1da177e4 1956{
4b1f0d33 1957 int true_vifi = ipmr_find_vif(mrt, dev);
1da177e4
LT		 1958 int psend = -1;
1959 int vif, ct;
1960
494fff56
YM		 1961 vif = c->_c.mfc_parent;
1962 c->_c.mfc_un.res.pkt++;
1963 c->_c.mfc_un.res.bytes += skb->len;
1964 c->_c.mfc_un.res.lastuse = jiffies;
1da177e4 1965
494fff56 1966 if (c->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) {
660b26dc
ND		 1967 struct mfc_cache *cache_proxy;
1968
974d8f86 1969 /* For an (*,G) entry, we only check that the incoming
660b26dc
ND		 1970 * interface is part of the static tree.
1971 */
845c9a7a 1972 cache_proxy = mr_mfc_find_any_parent(mrt, vif);
660b26dc 1973 if (cache_proxy &&
494fff56 1974 cache_proxy->_c.mfc_un.res.ttls[true_vifi] < 255)
660b26dc
ND		 1975 goto forward;
1976 }
1977
7ef8f65d 1978 /* Wrong interface: drop packet and (maybe) send PIM assert. */
ebc31979 1979 if (rcu_access_pointer(mrt->vif_table[vif].dev) != dev) {
c7537967 1980 if (rt_is_output_route(skb_rtable(skb))) {
1da177e4 1981 /* It is our own packet, looped back.
a8cb16dd
ED		 1982 * Very complicated situation...
1983 *
1984 * The best workaround until routing daemons will be
1985 * fixed is not to redistribute packet, if it was
1986 * send through wrong interface. It means, that
1987 * multicast applications WILL NOT work for
1988 * (S,G), which have default multicast route pointing
1989 * to wrong oif. In any case, it is not a good
1990 * idea to use multicasting applications on router.
1da177e4
LT		 1991 */
1992 goto dont_forward;
1993 }
1994
494fff56 1995 c->_c.mfc_un.res.wrong_if++;
1da177e4 1996
0c12295a 1997 if (true_vifi >= 0 && mrt->mroute_do_assert &&
1da177e4 1998 /* pimsm uses asserts, when switching from RPT to SPT,
a8cb16dd
ED		 1999 * so that we cannot check that packet arrived on an oif.
2000 * It is bad, but otherwise we would need to move pretty
2001 * large chunk of pimd to kernel. Ough... --ANK
1da177e4 2002 */
0c12295a 2003 (mrt->mroute_do_pim ||
494fff56 2004 c->_c.mfc_un.res.ttls[true_vifi] < 255) &&
e905a9ed 2005 time_after(jiffies,
494fff56
YM		 2006 c->_c.mfc_un.res.last_assert +
2007 MFC_ASSERT_THRESH)) {
2008 c->_c.mfc_un.res.last_assert = jiffies;
0c12295a 2009 ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF);
c921c207
NA		 2010 if (mrt->mroute_do_wrvifwhole)
2011 ipmr_cache_report(mrt, skb, true_vifi,
2012 IGMPMSG_WRVIFWHOLE);
1da177e4
LT		 2013 }
2014 goto dont_forward;
2015 }
2016
660b26dc 2017forward:
559260fd
ED		 2018 WRITE_ONCE(mrt->vif_table[vif].pkt_in,
2019 mrt->vif_table[vif].pkt_in + 1);
2020 WRITE_ONCE(mrt->vif_table[vif].bytes_in,
2021 mrt->vif_table[vif].bytes_in + skb->len);
1da177e4 2022
7ef8f65d 2023 /* Forward the frame */
494fff56
YM		 2024 if (c->mfc_origin == htonl(INADDR_ANY) &&
2025 c->mfc_mcastgrp == htonl(INADDR_ANY)) {
660b26dc 2026 if (true_vifi >= 0 &&
494fff56 2027 true_vifi != c->_c.mfc_parent &&
660b26dc 2028 ip_hdr(skb)->ttl >
494fff56 2029 c->_c.mfc_un.res.ttls[c->_c.mfc_parent]) {
660b26dc
ND		 2030 /* It's an (*,*) entry and the packet is not coming from
2031 * the upstream: forward the packet to the upstream
2032 * only.
2033 */
494fff56 2034 psend = c->_c.mfc_parent;
660b26dc
ND		 2035 goto last_forward;
2036 }
2037 goto dont_forward;
2038 }
494fff56
YM		 2039 for (ct = c->_c.mfc_un.res.maxvif - 1;
2040 ct >= c->_c.mfc_un.res.minvif; ct--) {
660b26dc 2041 /* For (*,G) entry, don't forward to the incoming interface */
494fff56 2042 if ((c->mfc_origin != htonl(INADDR_ANY) ||
360eb5da 2043 ct != true_vifi) &&
494fff56 2044 ip_hdr(skb)->ttl > c->_c.mfc_un.res.ttls[ct]) {
1da177e4
LT		 2045 if (psend != -1) {
2046 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
a8cb16dd 2047
1da177e4 2048 if (skb2)
a5bc9294 2049 ipmr_queue_xmit(net, mrt, true_vifi,
6e0735d1 2050 skb2, psend);
1da177e4 2051 }
c354e124 2052 psend = ct;
1da177e4
LT		 2053 }
2054 }
660b26dc 2055last_forward:
1da177e4
LT		 2056 if (psend != -1) {
2057 if (local) {
2058 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
a8cb16dd 2059
1da177e4 2060 if (skb2)
a5bc9294 2061 ipmr_queue_xmit(net, mrt, true_vifi, skb2,
6e0735d1 2062 psend);
1da177e4 2063 } else {
6e0735d1 2064 ipmr_queue_xmit(net, mrt, true_vifi, skb, psend);
c4854ec8 2065 return;
1da177e4
LT		 2066 }
2067 }
2068
2069dont_forward:
2070 if (!local)
2071 kfree_skb(skb);
1da177e4
LT		 2072}
2073
417da66f 2074static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb)
ee3f1aaf 2075{
417da66f
DM		 2076 struct rtable *rt = skb_rtable(skb);
2077 struct iphdr *iph = ip_hdr(skb);
da91981b 2078 struct flowi4 fl4 = {
417da66f
DM		 2079 .daddr = iph->daddr,
2080 .saddr = iph->saddr,
b0fe4a31 2081 .flowi4_tos = RT_TOS(iph->tos),
4fd551d7
DM		 2082 .flowi4_oif = (rt_is_output_route(rt) ?
2083 skb->dev->ifindex : 0),
2084 .flowi4_iif = (rt_is_output_route(rt) ?
1fb9489b 2085 LOOPBACK_IFINDEX :
4fd551d7 2086 skb->dev->ifindex),
b4869889 2087 .flowi4_mark = skb->mark,
ee3f1aaf
DM		 2088 };
2089 struct mr_table *mrt;
2090 int err;
2091
da91981b 2092 err = ipmr_fib_lookup(net, &fl4, &mrt);
ee3f1aaf
DM		 2093 if (err)
2094 return ERR_PTR(err);
2095 return mrt;
2096}
1da177e4 2097
7ef8f65d
NA		 2098/* Multicast packets for forwarding arrive here
2099 * Called with rcu_read_lock();
1da177e4 2100 */
1da177e4
LT		 2101int ip_mr_input(struct sk_buff *skb)
2102{
2103 struct mfc_cache *cache;
4feb88e5 2104 struct net *net = dev_net(skb->dev);
511c3f92 2105 int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL;
f0ad0860 2106 struct mr_table *mrt;
bcfc7d33
TW		 2107 struct net_device *dev;
2108
2109 /* skb->dev passed in is the loX master dev for vrfs.
2110 * As there are no vifs associated with loopback devices,
2111 * get the proper interface that does have a vif associated with it.
2112 */
2113 dev = skb->dev;
2114 if (netif_is_l3_master(skb->dev)) {
2115 dev = dev_get_by_index_rcu(net, IPCB(skb)->iif);
2116 if (!dev) {
2117 kfree_skb(skb);
2118 return -ENODEV;
2119 }
2120 }
1da177e4
LT		 2121
2122 /* Packet is looped back after forward, it should not be
a8cb16dd 2123 * forwarded second time, but still can be delivered locally.
1da177e4 2124 */
4c968709 2125 if (IPCB(skb)->flags & IPSKB_FORWARDED)
1da177e4
LT		 2126 goto dont_forward;
2127
417da66f 2128 mrt = ipmr_rt_fib_lookup(net, skb);
ee3f1aaf
DM		 2129 if (IS_ERR(mrt)) {
2130 kfree_skb(skb);
2131 return PTR_ERR(mrt);
e40dbc51 2132 }
1da177e4 2133 if (!local) {
4c968709
ED		 2134 if (IPCB(skb)->opt.router_alert) {
2135 if (ip_call_ra_chain(skb))
2136 return 0;
2137 } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) {
2138 /* IGMPv1 (and broken IGMPv2 implementations sort of
2139 * Cisco IOS <= 11.2(8)) do not put router alert
2140 * option to IGMP packets destined to routable
2141 * groups. It is very bad, because it means
2142 * that we can forward NO IGMP messages.
2143 */
2144 struct sock *mroute_sk;
2145
2146 mroute_sk = rcu_dereference(mrt->mroute_sk);
2147 if (mroute_sk) {
895b5c9f 2148 nf_reset_ct(skb);
4c968709
ED		 2149 raw_rcv(mroute_sk, skb);
2150 return 0;
2151 }
92c4bed5 2152 }
1da177e4
LT		 2153 }
2154
a8c9486b 2155 /* already under rcu_read_lock() */
0c12295a 2156 cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
51456b29 2157 if (!cache) {
bcfc7d33 2158 int vif = ipmr_find_vif(mrt, dev);
660b26dc
ND		 2159
2160 if (vif >= 0)
2161 cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr,
2162 vif);
2163 }
1da177e4 2164
7ef8f65d 2165 /* No usable cache entry */
51456b29 2166 if (!cache) {
1da177e4
LT		 2167 int vif;
2168
2169 if (local) {
2170 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2171 ip_local_deliver(skb);
51456b29 2172 if (!skb2)
1da177e4 2173 return -ENOBUFS;
1da177e4
LT		 2174 skb = skb2;
2175 }
2176
bcfc7d33 2177 vif = ipmr_find_vif(mrt, dev);
9094db4b
ED		 2178 if (vif >= 0)
2179 return ipmr_cache_unresolved(mrt, vif, skb, dev);
1da177e4
LT		 2180 kfree_skb(skb);
2181 return -ENODEV;
2182 }
2183
4b1f0d33 2184 ip_mr_forward(net, mrt, dev, skb, cache, local);
1da177e4
LT		 2185
2186 if (local)
2187 return ip_local_deliver(skb);
2188
2189 return 0;
2190
2191dont_forward:
2192 if (local)
2193 return ip_local_deliver(skb);
2194 kfree_skb(skb);
2195 return 0;
2196}
2197
b1879204 2198#ifdef CONFIG_IP_PIMSM_V1
7ef8f65d 2199/* Handle IGMP messages of PIMv1 */
a8cb16dd 2200int pim_rcv_v1(struct sk_buff *skb)
b1879204
IJ		 2201{
2202 struct igmphdr *pim;
4feb88e5 2203 struct net *net = dev_net(skb->dev);
f0ad0860 2204 struct mr_table *mrt;
b1879204
IJ		 2205
2206 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
2207 goto drop;
2208
2209 pim = igmp_hdr(skb);
2210
417da66f 2211 mrt = ipmr_rt_fib_lookup(net, skb);
ee3f1aaf
DM		 2212 if (IS_ERR(mrt))
2213 goto drop;
0c12295a 2214 if (!mrt->mroute_do_pim ||
b1879204
IJ		 2215 pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER)
2216 goto drop;
2217
f0ad0860 2218 if (__pim_rcv(mrt, skb, sizeof(*pim))) {
b1879204
IJ		 2219drop:
2220 kfree_skb(skb);
2221 }
1da177e4
LT		 2222 return 0;
2223}
2224#endif
2225
2226#ifdef CONFIG_IP_PIMSM_V2
a8cb16dd 2227static int pim_rcv(struct sk_buff *skb)
1da177e4
LT		 2228{
2229 struct pimreghdr *pim;
f0ad0860
PM		 2230 struct net *net = dev_net(skb->dev);
2231 struct mr_table *mrt;
1da177e4 2232
b1879204 2233 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
1da177e4
LT		 2234 goto drop;
2235
9c70220b 2236 pim = (struct pimreghdr *)skb_transport_header(skb);
56245cae 2237 if (pim->type != ((PIM_VERSION << 4) | (PIM_TYPE_REGISTER)) ||
a8cb16dd 2238 (pim->flags & PIM_NULL_REGISTER) ||
e905a9ed 2239 (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 &&
d3bc23e7 2240 csum_fold(skb_checksum(skb, 0, skb->len, 0))))
1da177e4
LT		 2241 goto drop;
2242
417da66f 2243 mrt = ipmr_rt_fib_lookup(net, skb);
ee3f1aaf
DM		 2244 if (IS_ERR(mrt))
2245 goto drop;
f0ad0860 2246 if (__pim_rcv(mrt, skb, sizeof(*pim))) {
b1879204
IJ		 2247drop:
2248 kfree_skb(skb);
2249 }
1da177e4
LT		 2250 return 0;
2251}
2252#endif
2253
9a1b9496
DM		 2254int ipmr_get_route(struct net *net, struct sk_buff *skb,
2255 __be32 saddr, __be32 daddr,
9f09eaea 2256 struct rtmsg *rtm, u32 portid)
1da177e4 2257{
1da177e4 2258 struct mfc_cache *cache;
9a1b9496
DM		 2259 struct mr_table *mrt;
2260 int err;
1da177e4 2261
f0ad0860 2262 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
51456b29 2263 if (!mrt)
f0ad0860
PM		 2264 return -ENOENT;
2265
a8c9486b 2266 rcu_read_lock();
9a1b9496 2267 cache = ipmr_cache_find(mrt, saddr, daddr);
51456b29 2268 if (!cache && skb->dev) {
660b26dc 2269 int vif = ipmr_find_vif(mrt, skb->dev);
1da177e4 2270
660b26dc
ND		 2271 if (vif >= 0)
2272 cache = ipmr_cache_find_any(mrt, daddr, vif);
2273 }
51456b29 2274 if (!cache) {
72287490 2275 struct sk_buff *skb2;
eddc9ec5 2276 struct iphdr *iph;
1da177e4 2277 struct net_device *dev;
a8cb16dd 2278 int vif = -1;
1da177e4 2279
1da177e4 2280 dev = skb->dev;
a8cb16dd
ED		 2281 if (dev)
2282 vif = ipmr_find_vif(mrt, dev);
2283 if (vif < 0) {
a8c9486b 2284 rcu_read_unlock();
1da177e4
LT		 2285 return -ENODEV;
2286 }
7901cd97
GN		 2287
2288 skb2 = skb_realloc_headroom(skb, sizeof(struct iphdr));
72287490 2289 if (!skb2) {
a8c9486b 2290 rcu_read_unlock();
72287490
AK		 2291 return -ENOMEM;
2292 }
2293
2cf75070 2294 NETLINK_CB(skb2).portid = portid;
e2d1bca7
ACM		 2295 skb_push(skb2, sizeof(struct iphdr));
2296 skb_reset_network_header(skb2);
eddc9ec5
ACM		 2297 iph = ip_hdr(skb2);
2298 iph->ihl = sizeof(struct iphdr) >> 2;
9a1b9496
DM		 2299 iph->saddr = saddr;
2300 iph->daddr = daddr;
eddc9ec5 2301 iph->version = 0;
4b1f0d33 2302 err = ipmr_cache_unresolved(mrt, vif, skb2, dev);
a8c9486b 2303 rcu_read_unlock();
1da177e4
LT		 2304 return err;
2305 }
2306
7b0db857 2307 err = mr_fill_mroute(mrt, skb, &cache->_c, rtm);
a8c9486b 2308 rcu_read_unlock();
1da177e4
LT		 2309 return err;
2310}
2311
cb6a4e46 2312static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
65886f43
ND		 2313 u32 portid, u32 seq, struct mfc_cache *c, int cmd,
2314 int flags)
cb6a4e46
PM		 2315{
2316 struct nlmsghdr *nlh;
2317 struct rtmsg *rtm;
1eb99af5 2318 int err;
cb6a4e46 2319
65886f43 2320 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
51456b29 2321 if (!nlh)
cb6a4e46
PM		 2322 return -EMSGSIZE;
2323
2324 rtm = nlmsg_data(nlh);
2325 rtm->rtm_family = RTNL_FAMILY_IPMR;
2326 rtm->rtm_dst_len = 32;
2327 rtm->rtm_src_len = 32;
2328 rtm->rtm_tos = 0;
2329 rtm->rtm_table = mrt->id;
f3756b79
DM		 2330 if (nla_put_u32(skb, RTA_TABLE, mrt->id))
2331 goto nla_put_failure;
cb6a4e46
PM		 2332 rtm->rtm_type = RTN_MULTICAST;
2333 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
494fff56 2334 if (c->_c.mfc_flags & MFC_STATIC)
9a68ac72
ND		 2335 rtm->rtm_protocol = RTPROT_STATIC;
2336 else
2337 rtm->rtm_protocol = RTPROT_MROUTED;
cb6a4e46
PM		 2338 rtm->rtm_flags = 0;
2339
930345ea
JB		 2340 if (nla_put_in_addr(skb, RTA_SRC, c->mfc_origin) ||
2341 nla_put_in_addr(skb, RTA_DST, c->mfc_mcastgrp))
f3756b79 2342 goto nla_put_failure;
7b0db857 2343 err = mr_fill_mroute(mrt, skb, &c->_c, rtm);
1eb99af5
ND		 2344 /* do not break the dump if cache is unresolved */
2345 if (err < 0 && err != -ENOENT)
cb6a4e46
PM		 2346 goto nla_put_failure;
2347
053c095a
JB		 2348 nlmsg_end(skb, nlh);
2349 return 0;
cb6a4e46
PM		 2350
2351nla_put_failure:
2352 nlmsg_cancel(skb, nlh);
2353 return -EMSGSIZE;
2354}
2355
7b0db857
YM		 2356static int _ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2357 u32 portid, u32 seq, struct mr_mfc *c, int cmd,
2358 int flags)
2359{
2360 return ipmr_fill_mroute(mrt, skb, portid, seq, (struct mfc_cache *)c,
2361 cmd, flags);
2362}
2363
8cd3ac9f
ND		 2364static size_t mroute_msgsize(bool unresolved, int maxvif)
2365{
2366 size_t len =
2367 NLMSG_ALIGN(sizeof(struct rtmsg))
2368 + nla_total_size(4) /* RTA_TABLE */
2369 + nla_total_size(4) /* RTA_SRC */
2370 + nla_total_size(4) /* RTA_DST */
2371 ;
2372
2373 if (!unresolved)
2374 len = len
2375 + nla_total_size(4) /* RTA_IIF */
2376 + nla_total_size(0) /* RTA_MULTIPATH */
2377 + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
2378 /* RTA_MFC_STATS */
a9a08042 2379 + nla_total_size_64bit(sizeof(struct rta_mfc_stats))
8cd3ac9f
ND		 2380 ;
2381
2382 return len;
2383}
2384
2385static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
2386 int cmd)
2387{
2388 struct net *net = read_pnet(&mrt->net);
2389 struct sk_buff *skb;
2390 int err = -ENOBUFS;
2391
494fff56
YM		 2392 skb = nlmsg_new(mroute_msgsize(mfc->_c.mfc_parent >= MAXVIFS,
2393 mrt->maxvif),
8cd3ac9f 2394 GFP_ATOMIC);
51456b29 2395 if (!skb)
8cd3ac9f
ND		 2396 goto errout;
2397
65886f43 2398 err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
8cd3ac9f
ND		 2399 if (err < 0)
2400 goto errout;
2401
2402 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE, NULL, GFP_ATOMIC);
2403 return;
2404
2405errout:
2406 kfree_skb(skb);
2407 if (err < 0)
2408 rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE, err);
2409}
2410
5a645dd8
JG		 2411static size_t igmpmsg_netlink_msgsize(size_t payloadlen)
2412{
2413 size_t len =
2414 NLMSG_ALIGN(sizeof(struct rtgenmsg))
2415 + nla_total_size(1) /* IPMRA_CREPORT_MSGTYPE */
2416 + nla_total_size(4) /* IPMRA_CREPORT_VIF_ID */
2417 + nla_total_size(4) /* IPMRA_CREPORT_SRC_ADDR */
2418 + nla_total_size(4) /* IPMRA_CREPORT_DST_ADDR */
501cb008 2419 + nla_total_size(4) /* IPMRA_CREPORT_TABLE */
5a645dd8
JG		 2420 /* IPMRA_CREPORT_PKT */
2421 + nla_total_size(payloadlen)
2422 ;
2423
2424 return len;
2425}
2426
0b490b51 2427static void igmpmsg_netlink_event(const struct mr_table *mrt, struct sk_buff *pkt)
5a645dd8
JG		 2428{
2429 struct net *net = read_pnet(&mrt->net);
2430 struct nlmsghdr *nlh;
2431 struct rtgenmsg *rtgenm;
2432 struct igmpmsg *msg;
2433 struct sk_buff *skb;
2434 struct nlattr *nla;
2435 int payloadlen;
2436
2437 payloadlen = pkt->len - sizeof(struct igmpmsg);
2438 msg = (struct igmpmsg *)skb_network_header(pkt);
2439
2440 skb = nlmsg_new(igmpmsg_netlink_msgsize(payloadlen), GFP_ATOMIC);
2441 if (!skb)
2442 goto errout;
2443
2444 nlh = nlmsg_put(skb, 0, 0, RTM_NEWCACHEREPORT,
2445 sizeof(struct rtgenmsg), 0);
2446 if (!nlh)
2447 goto errout;
2448 rtgenm = nlmsg_data(nlh);
2449 rtgenm->rtgen_family = RTNL_FAMILY_IPMR;
2450 if (nla_put_u8(skb, IPMRA_CREPORT_MSGTYPE, msg->im_msgtype) ||
bb82067c 2451 nla_put_u32(skb, IPMRA_CREPORT_VIF_ID, msg->im_vif | (msg->im_vif_hi << 8)) ||
5a645dd8
JG		 2452 nla_put_in_addr(skb, IPMRA_CREPORT_SRC_ADDR,
2453 msg->im_src.s_addr) ||
2454 nla_put_in_addr(skb, IPMRA_CREPORT_DST_ADDR,
501cb008
PD		 2455 msg->im_dst.s_addr) ||
2456 nla_put_u32(skb, IPMRA_CREPORT_TABLE, mrt->id))
5a645dd8
JG		 2457 goto nla_put_failure;
2458
2459 nla = nla_reserve(skb, IPMRA_CREPORT_PKT, payloadlen);
2460 if (!nla || skb_copy_bits(pkt, sizeof(struct igmpmsg),
2461 nla_data(nla), payloadlen))
2462 goto nla_put_failure;
2463
2464 nlmsg_end(skb, nlh);
2465
2466 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE_R, NULL, GFP_ATOMIC);
2467 return;
2468
2469nla_put_failure:
2470 nlmsg_cancel(skb, nlh);
2471errout:
2472 kfree_skb(skb);
2473 rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE_R, -ENOBUFS);
2474}
2475
d0440029
JK		 2476static int ipmr_rtm_valid_getroute_req(struct sk_buff *skb,
2477 const struct nlmsghdr *nlh,
2478 struct nlattr **tb,
2479 struct netlink_ext_ack *extack)
2480{
2481 struct rtmsg *rtm;
2482 int i, err;
2483
2484 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
2485 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for multicast route get request");
2486 return -EINVAL;
2487 }
2488
2489 if (!netlink_strict_get_check(skb))
8cb08174
JB		 2490 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
2491 rtm_ipv4_policy, extack);
d0440029
JK		 2492
2493 rtm = nlmsg_data(nlh);
2494 if ((rtm->rtm_src_len && rtm->rtm_src_len != 32) ||
2495 (rtm->rtm_dst_len && rtm->rtm_dst_len != 32) ||
2496 rtm->rtm_tos || rtm->rtm_table || rtm->rtm_protocol ||
2497 rtm->rtm_scope || rtm->rtm_type || rtm->rtm_flags) {
2498 NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for multicast route get request");
2499 return -EINVAL;
2500 }
2501
8cb08174
JB		 2502 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
2503 rtm_ipv4_policy, extack);
d0440029
JK		 2504 if (err)
2505 return err;
2506
2507 if ((tb[RTA_SRC] && !rtm->rtm_src_len) ||
2508 (tb[RTA_DST] && !rtm->rtm_dst_len)) {
2509 NL_SET_ERR_MSG(extack, "ipv4: rtm_src_len and rtm_dst_len must be 32 for IPv4");
2510 return -EINVAL;
2511 }
2512
2513 for (i = 0; i <= RTA_MAX; i++) {
2514 if (!tb[i])
2515 continue;
2516
2517 switch (i) {
2518 case RTA_SRC:
2519 case RTA_DST:
2520 case RTA_TABLE:
2521 break;
2522 default:
2523 NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in multicast route get request");
2524 return -EINVAL;
2525 }
2526 }
2527
2528 return 0;
2529}
2530
4f75ba69
DS		 2531static int ipmr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
2532 struct netlink_ext_ack *extack)
2533{
2534 struct net *net = sock_net(in_skb->sk);
2535 struct nlattr *tb[RTA_MAX + 1];
2536 struct sk_buff *skb = NULL;
2537 struct mfc_cache *cache;
2538 struct mr_table *mrt;
4f75ba69
DS		 2539 __be32 src, grp;
2540 u32 tableid;
2541 int err;
2542
d0440029 2543 err = ipmr_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
4f75ba69
DS		 2544 if (err < 0)
2545 goto errout;
2546
4f75ba69
DS		 2547 src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0;
2548 grp = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0;
2549 tableid = tb[RTA_TABLE] ? nla_get_u32(tb[RTA_TABLE]) : 0;
2550
2551 mrt = ipmr_get_table(net, tableid ? tableid : RT_TABLE_DEFAULT);
2e3d232e
DC		 2552 if (!mrt) {
2553 err = -ENOENT;
4f75ba69
DS		 2554 goto errout_free;
2555 }
2556
2557 /* entries are added/deleted only under RTNL */
2558 rcu_read_lock();
2559 cache = ipmr_cache_find(mrt, src, grp);
2560 rcu_read_unlock();
2561 if (!cache) {
2562 err = -ENOENT;
2563 goto errout_free;
2564 }
2565
2566 skb = nlmsg_new(mroute_msgsize(false, mrt->maxvif), GFP_KERNEL);
2567 if (!skb) {
2568 err = -ENOBUFS;
2569 goto errout_free;
2570 }
2571
2572 err = ipmr_fill_mroute(mrt, skb, NETLINK_CB(in_skb).portid,
2573 nlh->nlmsg_seq, cache,
2574 RTM_NEWROUTE, 0);
2575 if (err < 0)
2576 goto errout_free;
2577
2578 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2579
2580errout:
2581 return err;
2582
2583errout_free:
2584 kfree_skb(skb);
2585 goto errout;
2586}
2587
cb6a4e46
PM		 2588static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2589{
4724676d 2590 struct fib_dump_filter filter = {};
cb167893 2591 int err;
4724676d 2592
e8ba330a 2593 if (cb->strict_check) {
4724676d 2594 err = ip_valid_fib_dump_req(sock_net(skb->sk), cb->nlh,
effe6792 2595 &filter, cb);
e8ba330a
DA		 2596 if (err < 0)
2597 return err;
2598 }
2599
cb167893
DA		 2600 if (filter.table_id) {
2601 struct mr_table *mrt;
2602
2603 mrt = ipmr_get_table(sock_net(skb->sk), filter.table_id);
2604 if (!mrt) {
41b4bd98 2605 if (rtnl_msg_family(cb->nlh) != RTNL_FAMILY_IPMR)
ae677bbb
DA		 2606 return skb->len;
2607
cb167893
DA		 2608 NL_SET_ERR_MSG(cb->extack, "ipv4: MR table does not exist");
2609 return -ENOENT;
2610 }
2611 err = mr_table_dump(mrt, skb, cb, _ipmr_fill_mroute,
2612 &mfc_unres_lock, &filter);
2613 return skb->len ? : err;
2614 }
2615
7b0db857 2616 return mr_rtm_dumproute(skb, cb, ipmr_mr_table_iter,
cb167893 2617 _ipmr_fill_mroute, &mfc_unres_lock, &filter);
cb6a4e46
PM		 2618}
2619
ccbb0aa6
NA		 2620static const struct nla_policy rtm_ipmr_policy[RTA_MAX + 1] = {
2621 [RTA_SRC] = { .type = NLA_U32 },
2622 [RTA_DST] = { .type = NLA_U32 },
2623 [RTA_IIF] = { .type = NLA_U32 },
2624 [RTA_TABLE] = { .type = NLA_U32 },
2625 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2626};
2627
2628static bool ipmr_rtm_validate_proto(unsigned char rtm_protocol)
2629{
2630 switch (rtm_protocol) {
2631 case RTPROT_STATIC:
2632 case RTPROT_MROUTED:
2633 return true;
2634 }
2635 return false;
2636}
2637
2638static int ipmr_nla_get_ttls(const struct nlattr *nla, struct mfcctl *mfcc)
2639{
2640 struct rtnexthop *rtnh = nla_data(nla);
2641 int remaining = nla_len(nla), vifi = 0;
2642
2643 while (rtnh_ok(rtnh, remaining)) {
2644 mfcc->mfcc_ttls[vifi] = rtnh->rtnh_hops;
2645 if (++vifi == MAXVIFS)
2646 break;
2647 rtnh = rtnh_next(rtnh, &remaining);
2648 }
2649
2650 return remaining > 0 ? -EINVAL : vifi;
2651}
2652
2653/* returns < 0 on error, 0 for ADD_MFC and 1 for ADD_MFC_PROXY */
2654static int rtm_to_ipmr_mfcc(struct net *net, struct nlmsghdr *nlh,
2655 struct mfcctl *mfcc, int *mrtsock,
c21ef3e3
DA		 2656 struct mr_table **mrtret,
2657 struct netlink_ext_ack *extack)
ccbb0aa6
NA		 2658{
2659 struct net_device *dev = NULL;
2660 u32 tblid = RT_TABLE_DEFAULT;
2661 struct mr_table *mrt;
2662 struct nlattr *attr;
2663 struct rtmsg *rtm;
2664 int ret, rem;
2665
8cb08174
JB		 2666 ret = nlmsg_validate_deprecated(nlh, sizeof(*rtm), RTA_MAX,
2667 rtm_ipmr_policy, extack);
ccbb0aa6
NA		 2668 if (ret < 0)
2669 goto out;
2670 rtm = nlmsg_data(nlh);
2671
2672 ret = -EINVAL;
2673 if (rtm->rtm_family != RTNL_FAMILY_IPMR || rtm->rtm_dst_len != 32 ||
2674 rtm->rtm_type != RTN_MULTICAST ||
2675 rtm->rtm_scope != RT_SCOPE_UNIVERSE ||
2676 !ipmr_rtm_validate_proto(rtm->rtm_protocol))
2677 goto out;
2678
2679 memset(mfcc, 0, sizeof(*mfcc));
2680 mfcc->mfcc_parent = -1;
2681 ret = 0;
2682 nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), rem) {
2683 switch (nla_type(attr)) {
2684 case RTA_SRC:
2685 mfcc->mfcc_origin.s_addr = nla_get_be32(attr);
2686 break;
2687 case RTA_DST:
2688 mfcc->mfcc_mcastgrp.s_addr = nla_get_be32(attr);
2689 break;
2690 case RTA_IIF:
2691 dev = __dev_get_by_index(net, nla_get_u32(attr));
2692 if (!dev) {
2693 ret = -ENODEV;
2694 goto out;
2695 }
2696 break;
2697 case RTA_MULTIPATH:
2698 if (ipmr_nla_get_ttls(attr, mfcc) < 0) {
2699 ret = -EINVAL;
2700 goto out;
2701 }
2702 break;
2703 case RTA_PREFSRC:
2704 ret = 1;
2705 break;
2706 case RTA_TABLE:
2707 tblid = nla_get_u32(attr);
2708 break;
2709 }
2710 }
2711 mrt = ipmr_get_table(net, tblid);
2712 if (!mrt) {
2713 ret = -ENOENT;
2714 goto out;
2715 }
2716 *mrtret = mrt;
2717 *mrtsock = rtm->rtm_protocol == RTPROT_MROUTED ? 1 : 0;
2718 if (dev)
2719 mfcc->mfcc_parent = ipmr_find_vif(mrt, dev);
2720
2721out:
2722 return ret;
2723}
2724
2725/* takes care of both newroute and delroute */
c21ef3e3
DA		 2726static int ipmr_rtm_route(struct sk_buff *skb, struct nlmsghdr *nlh,
2727 struct netlink_ext_ack *extack)
ccbb0aa6
NA		 2728{
2729 struct net *net = sock_net(skb->sk);
2730 int ret, mrtsock, parent;
2731 struct mr_table *tbl;
2732 struct mfcctl mfcc;
2733
2734 mrtsock = 0;
2735 tbl = NULL;
c21ef3e3 2736 ret = rtm_to_ipmr_mfcc(net, nlh, &mfcc, &mrtsock, &tbl, extack);
ccbb0aa6
NA		 2737 if (ret < 0)
2738 return ret;
2739
2740 parent = ret ? mfcc.mfcc_parent : -1;
2741 if (nlh->nlmsg_type == RTM_NEWROUTE)
2742 return ipmr_mfc_add(net, tbl, &mfcc, mrtsock, parent);
2743 else
2744 return ipmr_mfc_delete(tbl, &mfcc, parent);
2745}
2746
772c344d
NA		 2747static bool ipmr_fill_table(struct mr_table *mrt, struct sk_buff *skb)
2748{
2749 u32 queue_len = atomic_read(&mrt->cache_resolve_queue_len);
2750
2751 if (nla_put_u32(skb, IPMRA_TABLE_ID, mrt->id) ||
2752 nla_put_u32(skb, IPMRA_TABLE_CACHE_RES_QUEUE_LEN, queue_len) ||
2753 nla_put_s32(skb, IPMRA_TABLE_MROUTE_REG_VIF_NUM,
2754 mrt->mroute_reg_vif_num) ||
2755 nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_ASSERT,
2756 mrt->mroute_do_assert) ||
c921c207
NA		 2757 nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_PIM, mrt->mroute_do_pim) ||
2758 nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_WRVIFWHOLE,
2759 mrt->mroute_do_wrvifwhole))
772c344d
NA		 2760 return false;
2761
2762 return true;
2763}
2764
2765static bool ipmr_fill_vif(struct mr_table *mrt, u32 vifid, struct sk_buff *skb)
2766{
ebc31979 2767 struct net_device *vif_dev;
772c344d
NA		 2768 struct nlattr *vif_nest;
2769 struct vif_device *vif;
2770
ebc31979 2771 vif = &mrt->vif_table[vifid];
0fcae3c8 2772 vif_dev = rtnl_dereference(vif->dev);
772c344d 2773 /* if the VIF doesn't exist just continue */
ebc31979 2774 if (!vif_dev)
772c344d
NA		 2775 return true;
2776
ae0be8de 2777 vif_nest = nla_nest_start_noflag(skb, IPMRA_VIF);
772c344d
NA		 2778 if (!vif_nest)
2779 return false;
ebc31979
ED		 2780
2781 if (nla_put_u32(skb, IPMRA_VIFA_IFINDEX, vif_dev->ifindex) ||
772c344d
NA		 2782 nla_put_u32(skb, IPMRA_VIFA_VIF_ID, vifid) ||
2783 nla_put_u16(skb, IPMRA_VIFA_FLAGS, vif->flags) ||
2784 nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_IN, vif->bytes_in,
2785 IPMRA_VIFA_PAD) ||
2786 nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_OUT, vif->bytes_out,
2787 IPMRA_VIFA_PAD) ||
2788 nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_IN, vif->pkt_in,
2789 IPMRA_VIFA_PAD) ||
2790 nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_OUT, vif->pkt_out,
2791 IPMRA_VIFA_PAD) ||
2792 nla_put_be32(skb, IPMRA_VIFA_LOCAL_ADDR, vif->local) ||
2793 nla_put_be32(skb, IPMRA_VIFA_REMOTE_ADDR, vif->remote)) {
2794 nla_nest_cancel(skb, vif_nest);
2795 return false;
2796 }
2797 nla_nest_end(skb, vif_nest);
2798
2799 return true;
2800}
2801
14fc5bb2
DA		 2802static int ipmr_valid_dumplink(const struct nlmsghdr *nlh,
2803 struct netlink_ext_ack *extack)
2804{
2805 struct ifinfomsg *ifm;
2806
2807 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
2808 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for ipmr link dump");
2809 return -EINVAL;
2810 }
2811
2812 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
2813 NL_SET_ERR_MSG(extack, "Invalid data after header in ipmr link dump");
2814 return -EINVAL;
2815 }
2816
2817 ifm = nlmsg_data(nlh);
2818 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
2819 ifm->ifi_change || ifm->ifi_index) {
2820 NL_SET_ERR_MSG(extack, "Invalid values in header for ipmr link dump request");
2821 return -EINVAL;
2822 }
2823
2824 return 0;
2825}
2826
772c344d
NA		 2827static int ipmr_rtm_dumplink(struct sk_buff *skb, struct netlink_callback *cb)
2828{
2829 struct net *net = sock_net(skb->sk);
2830 struct nlmsghdr *nlh = NULL;
2831 unsigned int t = 0, s_t;
2832 unsigned int e = 0, s_e;
2833 struct mr_table *mrt;
2834
14fc5bb2
DA		 2835 if (cb->strict_check) {
2836 int err = ipmr_valid_dumplink(cb->nlh, cb->extack);
2837
2838 if (err < 0)
2839 return err;
2840 }
2841
772c344d
NA		 2842 s_t = cb->args[0];
2843 s_e = cb->args[1];
2844
2845 ipmr_for_each_table(mrt, net) {
2846 struct nlattr *vifs, *af;
2847 struct ifinfomsg *hdr;
2848 u32 i;
2849
2850 if (t < s_t)
2851 goto skip_table;
2852 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
2853 cb->nlh->nlmsg_seq, RTM_NEWLINK,
2854 sizeof(*hdr), NLM_F_MULTI);
2855 if (!nlh)
2856 break;
2857
2858 hdr = nlmsg_data(nlh);
2859 memset(hdr, 0, sizeof(*hdr));
2860 hdr->ifi_family = RTNL_FAMILY_IPMR;
2861
ae0be8de 2862 af = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
772c344d
NA		 2863 if (!af) {
2864 nlmsg_cancel(skb, nlh);
2865 goto out;
2866 }
2867
2868 if (!ipmr_fill_table(mrt, skb)) {
2869 nlmsg_cancel(skb, nlh);
2870 goto out;
2871 }
2872
ae0be8de 2873 vifs = nla_nest_start_noflag(skb, IPMRA_TABLE_VIFS);
772c344d
NA		 2874 if (!vifs) {
2875 nla_nest_end(skb, af);
2876 nlmsg_end(skb, nlh);
2877 goto out;
2878 }
2879 for (i = 0; i < mrt->maxvif; i++) {
2880 if (e < s_e)
2881 goto skip_entry;
2882 if (!ipmr_fill_vif(mrt, i, skb)) {
2883 nla_nest_end(skb, vifs);
2884 nla_nest_end(skb, af);
2885 nlmsg_end(skb, nlh);
2886 goto out;
2887 }
2888skip_entry:
2889 e++;
2890 }
2891 s_e = 0;
2892 e = 0;
2893 nla_nest_end(skb, vifs);
2894 nla_nest_end(skb, af);
2895 nlmsg_end(skb, nlh);
2896skip_table:
2897 t++;
2898 }
2899
2900out:
2901 cb->args[1] = e;
2902 cb->args[0] = t;
2903
2904 return skb->len;
2905}
2906
e905a9ed 2907#ifdef CONFIG_PROC_FS
7ef8f65d
NA		 2908/* The /proc interfaces to multicast routing :
2909 * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif
1da177e4 2910 */
1da177e4
LT		 2911
2912static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos)
b96ef16d 2913 __acquires(RCU)
1da177e4 2914{
3feda6b4 2915 struct mr_vif_iter *iter = seq->private;
f6bb4514 2916 struct net *net = seq_file_net(seq);
f0ad0860
PM		 2917 struct mr_table *mrt;
2918
2919 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
51456b29 2920 if (!mrt)
f0ad0860
PM		 2921 return ERR_PTR(-ENOENT);
2922
2923 iter->mrt = mrt;
f6bb4514 2924
b96ef16d 2925 rcu_read_lock();
3feda6b4 2926 return mr_vif_seq_start(seq, pos);
1da177e4
LT		 2927}
2928
2929static void ipmr_vif_seq_stop(struct seq_file *seq, void *v)
b96ef16d 2930 __releases(RCU)
1da177e4 2931{
b96ef16d 2932 rcu_read_unlock();
1da177e4
LT		 2933}
2934
2935static int ipmr_vif_seq_show(struct seq_file *seq, void *v)
2936{
3feda6b4 2937 struct mr_vif_iter *iter = seq->private;
f0ad0860 2938 struct mr_table *mrt = iter->mrt;
f6bb4514 2939
1da177e4 2940 if (v == SEQ_START_TOKEN) {
e905a9ed 2941 seq_puts(seq,
1da177e4
LT		 2942 "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n");
2943 } else {
2944 const struct vif_device *vif = v;
ebc31979
ED		 2945 const struct net_device *vif_dev;
2946 const char *name;
1da177e4 2947
ebc31979
ED		 2948 vif_dev = vif_dev_read(vif);
2949 name = vif_dev ? vif_dev->name : "none";
1da177e4 2950 seq_printf(seq,
91e6dd82 2951 "%2td %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n",
0c12295a 2952 vif - mrt->vif_table,
e905a9ed 2953 name, vif->bytes_in, vif->pkt_in,
1da177e4
LT		 2954 vif->bytes_out, vif->pkt_out,
2955 vif->flags, vif->local, vif->remote);
2956 }
2957 return 0;
2958}
2959
f690808e 2960static const struct seq_operations ipmr_vif_seq_ops = {
1da177e4 2961 .start = ipmr_vif_seq_start,
3feda6b4 2962 .next = mr_vif_seq_next,
1da177e4
LT		 2963 .stop = ipmr_vif_seq_stop,
2964 .show = ipmr_vif_seq_show,
2965};
2966
1da177e4
LT		 2967static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
2968{
f6bb4514 2969 struct net *net = seq_file_net(seq);
f0ad0860 2970 struct mr_table *mrt;
f6bb4514 2971
f0ad0860 2972 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
51456b29 2973 if (!mrt)
f0ad0860 2974 return ERR_PTR(-ENOENT);
f6bb4514 2975
c8d61968 2976 return mr_mfc_seq_start(seq, pos, mrt, &mfc_unres_lock);
1da177e4
LT		 2977}
2978
2979static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
2980{
2981 int n;
2982
2983 if (v == SEQ_START_TOKEN) {
e905a9ed 2984 seq_puts(seq,
1da177e4
LT		 2985 "Group Origin Iif Pkts Bytes Wrong Oifs\n");
2986 } else {
2987 const struct mfc_cache *mfc = v;
c8d61968 2988 const struct mr_mfc_iter *it = seq->private;
f0ad0860 2989 const struct mr_table *mrt = it->mrt;
e905a9ed 2990
0eae88f3
ED		 2991 seq_printf(seq, "%08X %08X %-3hd",
2992 (__force u32) mfc->mfc_mcastgrp,
2993 (__force u32) mfc->mfc_origin,
494fff56 2994 mfc->_c.mfc_parent);
1da177e4 2995
0c12295a 2996 if (it->cache != &mrt->mfc_unres_queue) {
1ea472e2 2997 seq_printf(seq, " %8lu %8lu %8lu",
494fff56
YM		 2998 mfc->_c.mfc_un.res.pkt,
2999 mfc->_c.mfc_un.res.bytes,
3000 mfc->_c.mfc_un.res.wrong_if);
3001 for (n = mfc->_c.mfc_un.res.minvif;
3002 n < mfc->_c.mfc_un.res.maxvif; n++) {
0c12295a 3003 if (VIF_EXISTS(mrt, n) &&
494fff56 3004 mfc->_c.mfc_un.res.ttls[n] < 255)
cf958ae3 3005 seq_printf(seq,
e905a9ed 3006 " %2d:%-3d",
494fff56 3007 n, mfc->_c.mfc_un.res.ttls[n]);
1da177e4 3008 }
1ea472e2
BT		 3009 } else {
3010 /* unresolved mfc_caches don't contain
3011 * pkt, bytes and wrong_if values
3012 */
3013 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
1da177e4
LT		 3014 }
3015 seq_putc(seq, '\n');
3016 }
3017 return 0;
3018}
3019
f690808e 3020static const struct seq_operations ipmr_mfc_seq_ops = {
1da177e4 3021 .start = ipmr_mfc_seq_start,
c8d61968
YM		 3022 .next = mr_mfc_seq_next,
3023 .stop = mr_mfc_seq_stop,
1da177e4
LT		 3024 .show = ipmr_mfc_seq_show,
3025};
e905a9ed 3026#endif
1da177e4
LT		 3027
3028#ifdef CONFIG_IP_PIMSM_V2
32613090 3029static const struct net_protocol pim_protocol = {
1da177e4
LT		 3030 .handler = pim_rcv,
3031};
3032#endif
3033
4d65b948
YG		 3034static unsigned int ipmr_seq_read(struct net *net)
3035{
3036 ASSERT_RTNL();
3037
3038 return net->ipv4.ipmr_seq + ipmr_rules_seq_read(net);
3039}
3040
b7a59557
JP		 3041static int ipmr_dump(struct net *net, struct notifier_block *nb,
3042 struct netlink_ext_ack *extack)
4d65b948 3043{
cdc9f944 3044 return mr_dump(net, nb, RTNL_FAMILY_IPMR, ipmr_rules_dump,
194366b2 3045 ipmr_mr_table_iter, extack);
4d65b948
YG		 3046}
3047
3048static const struct fib_notifier_ops ipmr_notifier_ops_template = {
3049 .family = RTNL_FAMILY_IPMR,
3050 .fib_seq_read = ipmr_seq_read,
3051 .fib_dump = ipmr_dump,
3052 .owner = THIS_MODULE,
3053};
3054
ef739d8a 3055static int __net_init ipmr_notifier_init(struct net *net)
4d65b948
YG		 3056{
3057 struct fib_notifier_ops *ops;
3058
3059 net->ipv4.ipmr_seq = 0;
3060
3061 ops = fib_notifier_ops_register(&ipmr_notifier_ops_template, net);
3062 if (IS_ERR(ops))
3063 return PTR_ERR(ops);
3064 net->ipv4.ipmr_notifier_ops = ops;
3065
3066 return 0;
3067}
3068
3069static void __net_exit ipmr_notifier_exit(struct net *net)
3070{
3071 fib_notifier_ops_unregister(net->ipv4.ipmr_notifier_ops);
3072 net->ipv4.ipmr_notifier_ops = NULL;
3073}
3074
7ef8f65d 3075/* Setup for IP multicast routing */
cf958ae3
BT		 3076static int __net_init ipmr_net_init(struct net *net)
3077{
f0ad0860 3078 int err;
cf958ae3 3079
4d65b948
YG		 3080 err = ipmr_notifier_init(net);
3081 if (err)
3082 goto ipmr_notifier_fail;
3083
f0ad0860
PM		 3084 err = ipmr_rules_init(net);
3085 if (err < 0)
4d65b948 3086 goto ipmr_rules_fail;
f6bb4514
BT		 3087
3088#ifdef CONFIG_PROC_FS
3089 err = -ENOMEM;
c3506372
CH		 3090 if (!proc_create_net("ip_mr_vif", 0, net->proc_net, &ipmr_vif_seq_ops,
3091 sizeof(struct mr_vif_iter)))
f6bb4514 3092 goto proc_vif_fail;
c3506372
CH		 3093 if (!proc_create_net("ip_mr_cache", 0, net->proc_net, &ipmr_mfc_seq_ops,
3094 sizeof(struct mr_mfc_iter)))
f6bb4514
BT		 3095 goto proc_cache_fail;
3096#endif
2bb8b26c
BT		 3097 return 0;
3098
f6bb4514
BT		 3099#ifdef CONFIG_PROC_FS
3100proc_cache_fail:
ece31ffd 3101 remove_proc_entry("ip_mr_vif", net->proc_net);
f6bb4514 3102proc_vif_fail:
696e595f 3103 rtnl_lock();
f0ad0860 3104 ipmr_rules_exit(net);
696e595f 3105 rtnl_unlock();
f6bb4514 3106#endif
4d65b948
YG		 3107ipmr_rules_fail:
3108 ipmr_notifier_exit(net);
3109ipmr_notifier_fail:
cf958ae3
BT		 3110 return err;
3111}
3112
3113static void __net_exit ipmr_net_exit(struct net *net)
3114{
f6bb4514 3115#ifdef CONFIG_PROC_FS
ece31ffd
G		 3116 remove_proc_entry("ip_mr_cache", net->proc_net);
3117 remove_proc_entry("ip_mr_vif", net->proc_net);
f6bb4514 3118#endif
4d65b948 3119 ipmr_notifier_exit(net);
696e595f
ED		 3120}
3121
3122static void __net_exit ipmr_net_exit_batch(struct list_head *net_list)
3123{
3124 struct net *net;
3125
3126 rtnl_lock();
3127 list_for_each_entry(net, net_list, exit_list)
3128 ipmr_rules_exit(net);
3129 rtnl_unlock();
cf958ae3
BT		 3130}
3131
3132static struct pernet_operations ipmr_net_ops = {
3133 .init = ipmr_net_init,
3134 .exit = ipmr_net_exit,
696e595f 3135 .exit_batch = ipmr_net_exit_batch,
cf958ae3 3136};
e905a9ed 3137
03d2f897 3138int __init ip_mr_init(void)
1da177e4 3139{
03d2f897
WC		 3140 int err;
3141
1da177e4
LT		 3142 mrt_cachep = kmem_cache_create("ip_mrt_cache",
3143 sizeof(struct mfc_cache),
a8c9486b 3144 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC,
20c2df83 3145 NULL);
03d2f897 3146
cf958ae3
BT		 3147 err = register_pernet_subsys(&ipmr_net_ops);
3148 if (err)
3149 goto reg_pernet_fail;
3150
03d2f897
WC		 3151 err = register_netdevice_notifier(&ip_mr_notifier);
3152 if (err)
3153 goto reg_notif_fail;
403dbb97
TG		 3154#ifdef CONFIG_IP_PIMSM_V2
3155 if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) {
058bd4d2 3156 pr_err("%s: can't add PIM protocol\n", __func__);
403dbb97
TG		 3157 err = -EAGAIN;
3158 goto add_proto_fail;
3159 }
3160#endif
c7ac8679 3161 rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE,
b97bac64 3162 ipmr_rtm_getroute, ipmr_rtm_dumproute, 0);
ccbb0aa6 3163 rtnl_register(RTNL_FAMILY_IPMR, RTM_NEWROUTE,
b97bac64 3164 ipmr_rtm_route, NULL, 0);
ccbb0aa6 3165 rtnl_register(RTNL_FAMILY_IPMR, RTM_DELROUTE,
b97bac64 3166 ipmr_rtm_route, NULL, 0);
772c344d
NA		 3167
3168 rtnl_register(RTNL_FAMILY_IPMR, RTM_GETLINK,
b97bac64 3169 NULL, ipmr_rtm_dumplink, 0);
03d2f897 3170 return 0;
f6bb4514 3171
403dbb97
TG		 3172#ifdef CONFIG_IP_PIMSM_V2
3173add_proto_fail:
3174 unregister_netdevice_notifier(&ip_mr_notifier);
3175#endif
c3e38896 3176reg_notif_fail:
cf958ae3
BT		 3177 unregister_pernet_subsys(&ipmr_net_ops);
3178reg_pernet_fail:
c3e38896 3179 kmem_cache_destroy(mrt_cachep);
03d2f897 3180 return err;
1da177e4 3181}
Linux 6.x block layer and io_uring tree(s)