Merge tag 'fixes-v5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
[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
80static DEFINE_RWLOCK(mrt_lock);
81
7ef8f65d 82/* Multicast router control variables */
1da177e4 83
1da177e4
LT
84/* Special spinlock for queue of unresolved entries */
85static DEFINE_SPINLOCK(mfc_unres_lock);
86
87/* We return to original Alan's scheme. Hash table of resolved
a8cb16dd
ED
88 * entries is changed only in process context and protected
89 * with weak lock mrt_lock. Queue of unresolved entries is protected
90 * with strong spinlock mfc_unres_lock.
91 *
92 * In this case data path is free of exclusive locks at all.
1da177e4
LT
93 */
94
08009a76 95static struct kmem_cache *mrt_cachep __ro_after_init;
1da177e4 96
f0ad0860 97static struct mr_table *ipmr_new_table(struct net *net, u32 id);
acbb219d
FR
98static void ipmr_free_table(struct mr_table *mrt);
99
c4854ec8 100static void ip_mr_forward(struct net *net, struct mr_table *mrt,
4b1f0d33
DS
101 struct net_device *dev, struct sk_buff *skb,
102 struct mfc_cache *cache, int local);
0c12295a 103static int ipmr_cache_report(struct mr_table *mrt,
4feb88e5 104 struct sk_buff *pkt, vifi_t vifi, int assert);
8cd3ac9f
ND
105static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
106 int cmd);
5a645dd8 107static void igmpmsg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt);
ca8d4794 108static void mroute_clean_tables(struct mr_table *mrt, int flags);
e99e88a9 109static void ipmr_expire_process(struct timer_list *t);
f0ad0860
PM
110
111#ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
7013908c
AG
112#define ipmr_for_each_table(mrt, net) \
113 list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list, \
114 lockdep_rtnl_is_held() || \
115 list_empty(&net->ipv4.mr_tables))
f0ad0860 116
7b0db857
YM
117static struct mr_table *ipmr_mr_table_iter(struct net *net,
118 struct mr_table *mrt)
119{
120 struct mr_table *ret;
121
122 if (!mrt)
123 ret = list_entry_rcu(net->ipv4.mr_tables.next,
124 struct mr_table, list);
125 else
126 ret = list_entry_rcu(mrt->list.next,
127 struct mr_table, list);
128
129 if (&ret->list == &net->ipv4.mr_tables)
130 return NULL;
131 return ret;
132}
133
f0ad0860
PM
134static struct mr_table *ipmr_get_table(struct net *net, u32 id)
135{
136 struct mr_table *mrt;
137
138 ipmr_for_each_table(mrt, net) {
139 if (mrt->id == id)
140 return mrt;
141 }
142 return NULL;
143}
144
da91981b 145static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4,
f0ad0860
PM
146 struct mr_table **mrt)
147{
f0ad0860 148 int err;
95f4a45d
HFS
149 struct ipmr_result res;
150 struct fib_lookup_arg arg = {
151 .result = &res,
152 .flags = FIB_LOOKUP_NOREF,
153 };
f0ad0860 154
e58e4159
DA
155 /* update flow if oif or iif point to device enslaved to l3mdev */
156 l3mdev_update_flow(net, flowi4_to_flowi(flp4));
157
da91981b
DM
158 err = fib_rules_lookup(net->ipv4.mr_rules_ops,
159 flowi4_to_flowi(flp4), 0, &arg);
f0ad0860
PM
160 if (err < 0)
161 return err;
162 *mrt = res.mrt;
163 return 0;
164}
165
166static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp,
167 int flags, struct fib_lookup_arg *arg)
168{
169 struct ipmr_result *res = arg->result;
170 struct mr_table *mrt;
1da177e4 171
f0ad0860
PM
172 switch (rule->action) {
173 case FR_ACT_TO_TBL:
174 break;
175 case FR_ACT_UNREACHABLE:
176 return -ENETUNREACH;
177 case FR_ACT_PROHIBIT:
178 return -EACCES;
179 case FR_ACT_BLACKHOLE:
180 default:
181 return -EINVAL;
182 }
183
e58e4159
DA
184 arg->table = fib_rule_get_table(rule, arg);
185
186 mrt = ipmr_get_table(rule->fr_net, arg->table);
51456b29 187 if (!mrt)
f0ad0860
PM
188 return -EAGAIN;
189 res->mrt = mrt;
190 return 0;
191}
192
193static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
194{
195 return 1;
196}
197
198static const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = {
199 FRA_GENERIC_POLICY,
200};
201
202static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
b16fb418
RP
203 struct fib_rule_hdr *frh, struct nlattr **tb,
204 struct netlink_ext_ack *extack)
f0ad0860
PM
205{
206 return 0;
207}
208
209static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
210 struct nlattr **tb)
211{
212 return 1;
213}
214
215static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
216 struct fib_rule_hdr *frh)
217{
218 frh->dst_len = 0;
219 frh->src_len = 0;
220 frh->tos = 0;
221 return 0;
222}
223
04a6f82c 224static const struct fib_rules_ops __net_initconst ipmr_rules_ops_template = {
25239cee 225 .family = RTNL_FAMILY_IPMR,
f0ad0860
PM
226 .rule_size = sizeof(struct ipmr_rule),
227 .addr_size = sizeof(u32),
228 .action = ipmr_rule_action,
229 .match = ipmr_rule_match,
230 .configure = ipmr_rule_configure,
231 .compare = ipmr_rule_compare,
f0ad0860
PM
232 .fill = ipmr_rule_fill,
233 .nlgroup = RTNLGRP_IPV4_RULE,
234 .policy = ipmr_rule_policy,
235 .owner = THIS_MODULE,
236};
237
238static int __net_init ipmr_rules_init(struct net *net)
239{
240 struct fib_rules_ops *ops;
241 struct mr_table *mrt;
242 int err;
243
244 ops = fib_rules_register(&ipmr_rules_ops_template, net);
245 if (IS_ERR(ops))
246 return PTR_ERR(ops);
247
248 INIT_LIST_HEAD(&net->ipv4.mr_tables);
249
250 mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
1113ebbc
NA
251 if (IS_ERR(mrt)) {
252 err = PTR_ERR(mrt);
f0ad0860
PM
253 goto err1;
254 }
255
256 err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0);
257 if (err < 0)
258 goto err2;
259
260 net->ipv4.mr_rules_ops = ops;
261 return 0;
262
263err2:
f243e5a7 264 ipmr_free_table(mrt);
f0ad0860
PM
265err1:
266 fib_rules_unregister(ops);
267 return err;
268}
269
270static void __net_exit ipmr_rules_exit(struct net *net)
271{
272 struct mr_table *mrt, *next;
273
ed785309 274 rtnl_lock();
035320d5
ED
275 list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) {
276 list_del(&mrt->list);
acbb219d 277 ipmr_free_table(mrt);
035320d5 278 }
f0ad0860 279 fib_rules_unregister(net->ipv4.mr_rules_ops);
419df12f 280 rtnl_unlock();
f0ad0860 281}
4d65b948 282
b7a59557
JP
283static int ipmr_rules_dump(struct net *net, struct notifier_block *nb,
284 struct netlink_ext_ack *extack)
4d65b948 285{
b7a59557 286 return fib_rules_dump(net, nb, RTNL_FAMILY_IPMR, extack);
4d65b948
YG
287}
288
289static unsigned int ipmr_rules_seq_read(struct net *net)
290{
291 return fib_rules_seq_read(net, RTNL_FAMILY_IPMR);
292}
478e4c2f
YG
293
294bool ipmr_rule_default(const struct fib_rule *rule)
295{
296 return fib_rule_matchall(rule) && rule->table == RT_TABLE_DEFAULT;
297}
298EXPORT_SYMBOL(ipmr_rule_default);
f0ad0860
PM
299#else
300#define ipmr_for_each_table(mrt, net) \
301 for (mrt = net->ipv4.mrt; mrt; mrt = NULL)
302
7b0db857
YM
303static struct mr_table *ipmr_mr_table_iter(struct net *net,
304 struct mr_table *mrt)
305{
306 if (!mrt)
307 return net->ipv4.mrt;
308 return NULL;
309}
310
f0ad0860
PM
311static struct mr_table *ipmr_get_table(struct net *net, u32 id)
312{
313 return net->ipv4.mrt;
314}
315
da91981b 316static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4,
f0ad0860
PM
317 struct mr_table **mrt)
318{
319 *mrt = net->ipv4.mrt;
320 return 0;
321}
322
323static int __net_init ipmr_rules_init(struct net *net)
324{
1113ebbc
NA
325 struct mr_table *mrt;
326
327 mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
328 if (IS_ERR(mrt))
329 return PTR_ERR(mrt);
330 net->ipv4.mrt = mrt;
331 return 0;
f0ad0860
PM
332}
333
334static void __net_exit ipmr_rules_exit(struct net *net)
335{
ed785309 336 rtnl_lock();
acbb219d 337 ipmr_free_table(net->ipv4.mrt);
ed785309
WC
338 net->ipv4.mrt = NULL;
339 rtnl_unlock();
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;
364 struct mfc_cache *c = (struct mfc_cache *)ptr;
365
366 return cmparg->mfc_mcastgrp != c->mfc_mcastgrp ||
367 cmparg->mfc_origin != c->mfc_origin;
368}
369
370static const struct rhashtable_params ipmr_rht_params = {
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{
415 del_timer_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
1da177e4 509 read_lock(&mrt_lock);
cf3677ae
PE
510 dev->stats.tx_bytes += skb->len;
511 dev->stats.tx_packets++;
0c12295a 512 ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT);
1da177e4
LT
513 read_unlock(&mrt_lock);
514 kfree_skb(skb);
6ed10654 515 return NETDEV_TX_OK;
1da177e4
LT
516}
517
ee9b9596
ND
518static int reg_vif_get_iflink(const struct net_device *dev)
519{
520 return 0;
521}
522
007c3838
SH
523static const struct net_device_ops reg_vif_netdev_ops = {
524 .ndo_start_xmit = reg_vif_xmit,
ee9b9596 525 .ndo_get_iflink = reg_vif_get_iflink,
007c3838
SH
526};
527
1da177e4
LT
528static void reg_vif_setup(struct net_device *dev)
529{
530 dev->type = ARPHRD_PIMREG;
46f25dff 531 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8;
1da177e4 532 dev->flags = IFF_NOARP;
70cb4a45 533 dev->netdev_ops = &reg_vif_netdev_ops;
cf124db5 534 dev->needs_free_netdev = true;
403dbb97 535 dev->features |= NETIF_F_NETNS_LOCAL;
1da177e4
LT
536}
537
f0ad0860 538static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
1da177e4
LT
539{
540 struct net_device *dev;
f0ad0860 541 char name[IFNAMSIZ];
1da177e4 542
f0ad0860
PM
543 if (mrt->id == RT_TABLE_DEFAULT)
544 sprintf(name, "pimreg");
545 else
546 sprintf(name, "pimreg%u", mrt->id);
1da177e4 547
c835a677 548 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup);
1da177e4 549
51456b29 550 if (!dev)
1da177e4
LT
551 return NULL;
552
403dbb97
TG
553 dev_net_set(dev, net);
554
1da177e4
LT
555 if (register_netdevice(dev)) {
556 free_netdev(dev);
557 return NULL;
558 }
1da177e4 559
a0b47736 560 if (!ipmr_init_vif_indev(dev))
1da177e4 561 goto failure;
00f54e68 562 if (dev_open(dev, NULL))
1da177e4
LT
563 goto failure;
564
7dc00c82
WC
565 dev_hold(dev);
566
1da177e4
LT
567 return dev;
568
569failure:
1da177e4
LT
570 unregister_netdevice(dev);
571 return NULL;
572}
c316c629
NA
573
574/* called with rcu_read_lock() */
575static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb,
576 unsigned int pimlen)
577{
578 struct net_device *reg_dev = NULL;
579 struct iphdr *encap;
580
581 encap = (struct iphdr *)(skb_transport_header(skb) + pimlen);
7ef8f65d 582 /* Check that:
c316c629
NA
583 * a. packet is really sent to a multicast group
584 * b. packet is not a NULL-REGISTER
585 * c. packet is not truncated
586 */
587 if (!ipv4_is_multicast(encap->daddr) ||
588 encap->tot_len == 0 ||
589 ntohs(encap->tot_len) + pimlen > skb->len)
590 return 1;
591
592 read_lock(&mrt_lock);
593 if (mrt->mroute_reg_vif_num >= 0)
594 reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev;
595 read_unlock(&mrt_lock);
596
597 if (!reg_dev)
598 return 1;
599
600 skb->mac_header = skb->network_header;
601 skb_pull(skb, (u8 *)encap - skb->data);
602 skb_reset_network_header(skb);
603 skb->protocol = htons(ETH_P_IP);
604 skb->ip_summed = CHECKSUM_NONE;
605
606 skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
607
608 netif_rx(skb);
609
610 return NET_RX_SUCCESS;
611}
612#else
613static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
614{
615 return NULL;
616}
1da177e4
LT
617#endif
618
b362053a
YG
619static int call_ipmr_vif_entry_notifiers(struct net *net,
620 enum fib_event_type event_type,
621 struct vif_device *vif,
622 vifi_t vif_index, u32 tb_id)
623{
bc67a0da
YM
624 return mr_call_vif_notifiers(net, RTNL_FAMILY_IPMR, event_type,
625 vif, vif_index, tb_id,
626 &net->ipv4.ipmr_seq);
b362053a
YG
627}
628
b362053a
YG
629static int call_ipmr_mfc_entry_notifiers(struct net *net,
630 enum fib_event_type event_type,
631 struct mfc_cache *mfc, u32 tb_id)
632{
54c4cad9
YM
633 return mr_call_mfc_notifiers(net, RTNL_FAMILY_IPMR, event_type,
634 &mfc->_c, tb_id, &net->ipv4.ipmr_seq);
b362053a
YG
635}
636
2c53040f
BH
637/**
638 * vif_delete - Delete a VIF entry
3628e3cb
AL
639 * @mrt: Table to delete from
640 * @vifi: VIF identifier to delete
7dc00c82 641 * @notify: Set to 1, if the caller is a notifier_call
3628e3cb 642 * @head: if unregistering the VIF, place it on this queue
1da177e4 643 */
0c12295a 644static int vif_delete(struct mr_table *mrt, int vifi, int notify,
d17fa6fa 645 struct list_head *head)
1da177e4 646{
b362053a 647 struct net *net = read_pnet(&mrt->net);
1da177e4
LT
648 struct vif_device *v;
649 struct net_device *dev;
650 struct in_device *in_dev;
651
0c12295a 652 if (vifi < 0 || vifi >= mrt->maxvif)
1da177e4
LT
653 return -EADDRNOTAVAIL;
654
0c12295a 655 v = &mrt->vif_table[vifi];
1da177e4 656
b362053a
YG
657 if (VIF_EXISTS(mrt, vifi))
658 call_ipmr_vif_entry_notifiers(net, FIB_EVENT_VIF_DEL, v, vifi,
659 mrt->id);
660
1da177e4
LT
661 write_lock_bh(&mrt_lock);
662 dev = v->dev;
663 v->dev = NULL;
664
665 if (!dev) {
666 write_unlock_bh(&mrt_lock);
667 return -EADDRNOTAVAIL;
668 }
669
0c12295a
PM
670 if (vifi == mrt->mroute_reg_vif_num)
671 mrt->mroute_reg_vif_num = -1;
1da177e4 672
a8cb16dd 673 if (vifi + 1 == mrt->maxvif) {
1da177e4 674 int tmp;
a8cb16dd
ED
675
676 for (tmp = vifi - 1; tmp >= 0; tmp--) {
0c12295a 677 if (VIF_EXISTS(mrt, tmp))
1da177e4
LT
678 break;
679 }
0c12295a 680 mrt->maxvif = tmp+1;
1da177e4
LT
681 }
682
683 write_unlock_bh(&mrt_lock);
684
685 dev_set_allmulti(dev, -1);
686
a8cb16dd
ED
687 in_dev = __in_dev_get_rtnl(dev);
688 if (in_dev) {
42f811b8 689 IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--;
3b022865 690 inet_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
d67b8c61
ND
691 NETCONFA_MC_FORWARDING,
692 dev->ifindex, &in_dev->cnf);
1da177e4
LT
693 ip_rt_multicast_event(in_dev);
694 }
695
a8cb16dd 696 if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify)
d17fa6fa 697 unregister_netdevice_queue(dev, head);
1da177e4
LT
698
699 dev_put(dev);
700 return 0;
701}
702
a8c9486b 703static void ipmr_cache_free_rcu(struct rcu_head *head)
5c0a66f5 704{
494fff56 705 struct mr_mfc *c = container_of(head, struct mr_mfc, rcu);
a8c9486b 706
494fff56 707 kmem_cache_free(mrt_cachep, (struct mfc_cache *)c);
5c0a66f5
BT
708}
709
8c13af2a 710static void ipmr_cache_free(struct mfc_cache *c)
a8c9486b 711{
494fff56 712 call_rcu(&c->_c.rcu, ipmr_cache_free_rcu);
a8c9486b
ED
713}
714
1da177e4 715/* Destroy an unresolved cache entry, killing queued skbs
a8cb16dd 716 * and reporting error to netlink readers.
1da177e4 717 */
0c12295a 718static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c)
1da177e4 719{
8de53dfb 720 struct net *net = read_pnet(&mrt->net);
1da177e4 721 struct sk_buff *skb;
9ef1d4c7 722 struct nlmsgerr *e;
1da177e4 723
0c12295a 724 atomic_dec(&mrt->cache_resolve_queue_len);
1da177e4 725
494fff56 726 while ((skb = skb_dequeue(&c->_c.mfc_un.unres.unresolved))) {
eddc9ec5 727 if (ip_hdr(skb)->version == 0) {
af72868b
JB
728 struct nlmsghdr *nlh = skb_pull(skb,
729 sizeof(struct iphdr));
1da177e4 730 nlh->nlmsg_type = NLMSG_ERROR;
573ce260 731 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
1da177e4 732 skb_trim(skb, nlh->nlmsg_len);
573ce260 733 e = nlmsg_data(nlh);
9ef1d4c7
PM
734 e->error = -ETIMEDOUT;
735 memset(&e->msg, 0, sizeof(e->msg));
2942e900 736
15e47304 737 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
a8cb16dd 738 } else {
1da177e4 739 kfree_skb(skb);
a8cb16dd 740 }
1da177e4
LT
741 }
742
5c0a66f5 743 ipmr_cache_free(c);
1da177e4
LT
744}
745
e258beb2 746/* Timer process for the unresolved queue. */
e99e88a9 747static void ipmr_expire_process(struct timer_list *t)
1da177e4 748{
e99e88a9 749 struct mr_table *mrt = from_timer(mrt, t, ipmr_expire_timer);
494fff56 750 struct mr_mfc *c, *next;
1da177e4 751 unsigned long expires;
494fff56 752 unsigned long now;
1da177e4
LT
753
754 if (!spin_trylock(&mfc_unres_lock)) {
0c12295a 755 mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10);
1da177e4
LT
756 return;
757 }
758
0c12295a 759 if (list_empty(&mrt->mfc_unres_queue))
1da177e4
LT
760 goto out;
761
762 now = jiffies;
763 expires = 10*HZ;
1da177e4 764
0c12295a 765 list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
1da177e4
LT
766 if (time_after(c->mfc_un.unres.expires, now)) {
767 unsigned long interval = c->mfc_un.unres.expires - now;
768 if (interval < expires)
769 expires = interval;
1da177e4
LT
770 continue;
771 }
772
862465f2 773 list_del(&c->list);
494fff56
YM
774 mroute_netlink_event(mrt, (struct mfc_cache *)c, RTM_DELROUTE);
775 ipmr_destroy_unres(mrt, (struct mfc_cache *)c);
1da177e4
LT
776 }
777
0c12295a
PM
778 if (!list_empty(&mrt->mfc_unres_queue))
779 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
1da177e4
LT
780
781out:
782 spin_unlock(&mfc_unres_lock);
783}
784
785/* Fill oifs list. It is called under write locked mrt_lock. */
494fff56 786static void ipmr_update_thresholds(struct mr_table *mrt, struct mr_mfc *cache,
d658f8a0 787 unsigned char *ttls)
1da177e4
LT
788{
789 int vifi;
790
791 cache->mfc_un.res.minvif = MAXVIFS;
792 cache->mfc_un.res.maxvif = 0;
793 memset(cache->mfc_un.res.ttls, 255, MAXVIFS);
794
0c12295a
PM
795 for (vifi = 0; vifi < mrt->maxvif; vifi++) {
796 if (VIF_EXISTS(mrt, vifi) &&
cf958ae3 797 ttls[vifi] && ttls[vifi] < 255) {
1da177e4
LT
798 cache->mfc_un.res.ttls[vifi] = ttls[vifi];
799 if (cache->mfc_un.res.minvif > vifi)
800 cache->mfc_un.res.minvif = vifi;
801 if (cache->mfc_un.res.maxvif <= vifi)
802 cache->mfc_un.res.maxvif = vifi + 1;
803 }
804 }
90b5ca17 805 cache->mfc_un.res.lastuse = jiffies;
1da177e4
LT
806}
807
0c12295a
PM
808static int vif_add(struct net *net, struct mr_table *mrt,
809 struct vifctl *vifc, int mrtsock)
1da177e4 810{
bccb3025 811 struct netdev_phys_item_id ppid = { };
1da177e4 812 int vifi = vifc->vifc_vifi;
0c12295a 813 struct vif_device *v = &mrt->vif_table[vifi];
1da177e4
LT
814 struct net_device *dev;
815 struct in_device *in_dev;
d607032d 816 int err;
1da177e4
LT
817
818 /* Is vif busy ? */
0c12295a 819 if (VIF_EXISTS(mrt, vifi))
1da177e4
LT
820 return -EADDRINUSE;
821
822 switch (vifc->vifc_flags) {
1da177e4 823 case VIFF_REGISTER:
1973a4ea 824 if (!ipmr_pimsm_enabled())
c316c629
NA
825 return -EINVAL;
826 /* Special Purpose VIF in PIM
1da177e4
LT
827 * All the packets will be sent to the daemon
828 */
0c12295a 829 if (mrt->mroute_reg_vif_num >= 0)
1da177e4 830 return -EADDRINUSE;
f0ad0860 831 dev = ipmr_reg_vif(net, mrt);
1da177e4
LT
832 if (!dev)
833 return -ENOBUFS;
d607032d
WC
834 err = dev_set_allmulti(dev, 1);
835 if (err) {
836 unregister_netdevice(dev);
7dc00c82 837 dev_put(dev);
d607032d
WC
838 return err;
839 }
1da177e4 840 break;
e905a9ed 841 case VIFF_TUNNEL:
4feb88e5 842 dev = ipmr_new_tunnel(net, vifc);
c1fd1182
CH
843 if (IS_ERR(dev))
844 return PTR_ERR(dev);
1da177e4 845 break;
ee5e81f0 846 case VIFF_USE_IFINDEX:
1da177e4 847 case 0:
ee5e81f0
I
848 if (vifc->vifc_flags == VIFF_USE_IFINDEX) {
849 dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex);
51456b29 850 if (dev && !__in_dev_get_rtnl(dev)) {
ee5e81f0
I
851 dev_put(dev);
852 return -EADDRNOTAVAIL;
853 }
a8cb16dd 854 } else {
ee5e81f0 855 dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr);
a8cb16dd 856 }
1da177e4
LT
857 if (!dev)
858 return -EADDRNOTAVAIL;
d607032d 859 err = dev_set_allmulti(dev, 1);
7dc00c82
WC
860 if (err) {
861 dev_put(dev);
d607032d 862 return err;
7dc00c82 863 }
1da177e4
LT
864 break;
865 default:
866 return -EINVAL;
867 }
868
a8cb16dd
ED
869 in_dev = __in_dev_get_rtnl(dev);
870 if (!in_dev) {
d0490cfd 871 dev_put(dev);
1da177e4 872 return -EADDRNOTAVAIL;
d0490cfd 873 }
42f811b8 874 IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++;
3b022865
DA
875 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_MC_FORWARDING,
876 dev->ifindex, &in_dev->cnf);
1da177e4
LT
877 ip_rt_multicast_event(in_dev);
878
a8cb16dd 879 /* Fill in the VIF structures */
6853f21f
YM
880 vif_device_init(v, dev, vifc->vifc_rate_limit,
881 vifc->vifc_threshold,
882 vifc->vifc_flags | (!mrtsock ? VIFF_STATIC : 0),
883 (VIFF_TUNNEL | VIFF_REGISTER));
a8cb16dd 884
bccb3025
FF
885 err = dev_get_port_parent_id(dev, &ppid, true);
886 if (err == 0) {
887 memcpy(v->dev_parent_id.id, ppid.id, ppid.id_len);
888 v->dev_parent_id.id_len = ppid.id_len;
5d8b3e69
YG
889 } else {
890 v->dev_parent_id.id_len = 0;
891 }
6853f21f 892
c354e124
JK
893 v->local = vifc->vifc_lcl_addr.s_addr;
894 v->remote = vifc->vifc_rmt_addr.s_addr;
1da177e4
LT
895
896 /* And finish update writing critical data */
897 write_lock_bh(&mrt_lock);
c354e124 898 v->dev = dev;
a8cb16dd 899 if (v->flags & VIFF_REGISTER)
0c12295a 900 mrt->mroute_reg_vif_num = vifi;
0c12295a
PM
901 if (vifi+1 > mrt->maxvif)
902 mrt->maxvif = vifi+1;
1da177e4 903 write_unlock_bh(&mrt_lock);
b362053a 904 call_ipmr_vif_entry_notifiers(net, FIB_EVENT_VIF_ADD, v, vifi, mrt->id);
1da177e4
LT
905 return 0;
906}
907
a8c9486b 908/* called with rcu_read_lock() */
0c12295a 909static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt,
4feb88e5
BT
910 __be32 origin,
911 __be32 mcastgrp)
1da177e4 912{
8fb472c0
NA
913 struct mfc_cache_cmp_arg arg = {
914 .mfc_mcastgrp = mcastgrp,
915 .mfc_origin = origin
916 };
660b26dc 917
845c9a7a 918 return mr_mfc_find(mrt, &arg);
660b26dc
ND
919}
920
921/* Look for a (*,G) entry */
922static struct mfc_cache *ipmr_cache_find_any(struct mr_table *mrt,
923 __be32 mcastgrp, int vifi)
924{
8fb472c0
NA
925 struct mfc_cache_cmp_arg arg = {
926 .mfc_mcastgrp = mcastgrp,
927 .mfc_origin = htonl(INADDR_ANY)
928 };
660b26dc 929
360eb5da 930 if (mcastgrp == htonl(INADDR_ANY))
845c9a7a
YM
931 return mr_mfc_find_any_parent(mrt, vifi);
932 return mr_mfc_find_any(mrt, vifi, &arg);
660b26dc
ND
933}
934
8fb472c0
NA
935/* Look for a (S,G,iif) entry if parent != -1 */
936static struct mfc_cache *ipmr_cache_find_parent(struct mr_table *mrt,
937 __be32 origin, __be32 mcastgrp,
938 int parent)
939{
940 struct mfc_cache_cmp_arg arg = {
941 .mfc_mcastgrp = mcastgrp,
942 .mfc_origin = origin,
943 };
8fb472c0 944
845c9a7a 945 return mr_mfc_find_parent(mrt, &arg, parent);
8fb472c0
NA
946}
947
7ef8f65d 948/* Allocate a multicast cache entry */
d658f8a0 949static struct mfc_cache *ipmr_cache_alloc(void)
1da177e4 950{
c354e124 951 struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
a8c9486b 952
70a0dec4 953 if (c) {
494fff56
YM
954 c->_c.mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1;
955 c->_c.mfc_un.res.minvif = MAXVIFS;
8c13af2a 956 c->_c.free = ipmr_cache_free_rcu;
494fff56 957 refcount_set(&c->_c.mfc_un.res.refcount, 1);
70a0dec4 958 }
1da177e4
LT
959 return c;
960}
961
d658f8a0 962static struct mfc_cache *ipmr_cache_alloc_unres(void)
1da177e4 963{
c354e124 964 struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
a8c9486b
ED
965
966 if (c) {
494fff56
YM
967 skb_queue_head_init(&c->_c.mfc_un.unres.unresolved);
968 c->_c.mfc_un.unres.expires = jiffies + 10 * HZ;
a8c9486b 969 }
1da177e4
LT
970 return c;
971}
972
7ef8f65d 973/* A cache entry has gone into a resolved state from queued */
0c12295a
PM
974static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt,
975 struct mfc_cache *uc, struct mfc_cache *c)
1da177e4
LT
976{
977 struct sk_buff *skb;
9ef1d4c7 978 struct nlmsgerr *e;
1da177e4 979
a8cb16dd 980 /* Play the pending entries through our router */
494fff56 981 while ((skb = __skb_dequeue(&uc->_c.mfc_un.unres.unresolved))) {
eddc9ec5 982 if (ip_hdr(skb)->version == 0) {
af72868b
JB
983 struct nlmsghdr *nlh = skb_pull(skb,
984 sizeof(struct iphdr));
1da177e4 985
7b0db857
YM
986 if (mr_fill_mroute(mrt, skb, &c->_c,
987 nlmsg_data(nlh)) > 0) {
a8cb16dd
ED
988 nlh->nlmsg_len = skb_tail_pointer(skb) -
989 (u8 *)nlh;
1da177e4
LT
990 } else {
991 nlh->nlmsg_type = NLMSG_ERROR;
573ce260 992 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
1da177e4 993 skb_trim(skb, nlh->nlmsg_len);
573ce260 994 e = nlmsg_data(nlh);
9ef1d4c7
PM
995 e->error = -EMSGSIZE;
996 memset(&e->msg, 0, sizeof(e->msg));
1da177e4 997 }
2942e900 998
15e47304 999 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
a8cb16dd 1000 } else {
4b1f0d33 1001 ip_mr_forward(net, mrt, skb->dev, skb, c, 0);
a8cb16dd 1002 }
1da177e4
LT
1003 }
1004}
1005
5a645dd8 1006/* Bounce a cache query up to mrouted and netlink.
1da177e4 1007 *
c316c629 1008 * Called under mrt_lock.
1da177e4 1009 */
0c12295a 1010static int ipmr_cache_report(struct mr_table *mrt,
4feb88e5 1011 struct sk_buff *pkt, vifi_t vifi, int assert)
1da177e4 1012{
c9bdd4b5 1013 const int ihl = ip_hdrlen(pkt);
c316c629 1014 struct sock *mroute_sk;
1da177e4
LT
1015 struct igmphdr *igmp;
1016 struct igmpmsg *msg;
c316c629 1017 struct sk_buff *skb;
1da177e4
LT
1018 int ret;
1019
c921c207 1020 if (assert == IGMPMSG_WHOLEPKT || assert == IGMPMSG_WRVIFWHOLE)
1da177e4
LT
1021 skb = skb_realloc_headroom(pkt, sizeof(struct iphdr));
1022 else
1da177e4
LT
1023 skb = alloc_skb(128, GFP_ATOMIC);
1024
132adf54 1025 if (!skb)
1da177e4
LT
1026 return -ENOBUFS;
1027
c921c207 1028 if (assert == IGMPMSG_WHOLEPKT || assert == IGMPMSG_WRVIFWHOLE) {
1da177e4 1029 /* Ugly, but we have no choice with this interface.
a8cb16dd
ED
1030 * Duplicate old header, fix ihl, length etc.
1031 * And all this only to mangle msg->im_msgtype and
1032 * to set msg->im_mbz to "mbz" :-)
1da177e4 1033 */
878c8145
ACM
1034 skb_push(skb, sizeof(struct iphdr));
1035 skb_reset_network_header(skb);
badff6d0 1036 skb_reset_transport_header(skb);
0272ffc4 1037 msg = (struct igmpmsg *)skb_network_header(skb);
d56f90a7 1038 memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr));
c921c207 1039 msg->im_msgtype = assert;
1da177e4 1040 msg->im_mbz = 0;
c8715a8e 1041 if (assert == IGMPMSG_WRVIFWHOLE) {
c921c207 1042 msg->im_vif = vifi;
c8715a8e
PD
1043 msg->im_vif_hi = vifi >> 8;
1044 } else {
c921c207 1045 msg->im_vif = mrt->mroute_reg_vif_num;
c8715a8e
PD
1046 msg->im_vif_hi = mrt->mroute_reg_vif_num >> 8;
1047 }
eddc9ec5
ACM
1048 ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2;
1049 ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) +
1050 sizeof(struct iphdr));
c316c629
NA
1051 } else {
1052 /* Copy the IP header */
1053 skb_set_network_header(skb, skb->len);
1054 skb_put(skb, ihl);
1055 skb_copy_to_linear_data(skb, pkt->data, ihl);
1056 /* Flag to the kernel this is a route add */
1057 ip_hdr(skb)->protocol = 0;
1058 msg = (struct igmpmsg *)skb_network_header(skb);
1059 msg->im_vif = vifi;
c8715a8e 1060 msg->im_vif_hi = vifi >> 8;
c316c629
NA
1061 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
1062 /* Add our header */
4df864c1 1063 igmp = skb_put(skb, sizeof(struct igmphdr));
c316c629
NA
1064 igmp->type = assert;
1065 msg->im_msgtype = assert;
1066 igmp->code = 0;
1067 ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */
1068 skb->transport_header = skb->network_header;
e905a9ed 1069 }
1da177e4 1070
4c968709
ED
1071 rcu_read_lock();
1072 mroute_sk = rcu_dereference(mrt->mroute_sk);
51456b29 1073 if (!mroute_sk) {
4c968709 1074 rcu_read_unlock();
1da177e4
LT
1075 kfree_skb(skb);
1076 return -EINVAL;
1077 }
1078
5a645dd8
JG
1079 igmpmsg_netlink_event(mrt, skb);
1080
a8cb16dd 1081 /* Deliver to mrouted */
4c968709
ED
1082 ret = sock_queue_rcv_skb(mroute_sk, skb);
1083 rcu_read_unlock();
70a269e6 1084 if (ret < 0) {
e87cc472 1085 net_warn_ratelimited("mroute: pending queue full, dropping entries\n");
1da177e4
LT
1086 kfree_skb(skb);
1087 }
1088
1089 return ret;
1090}
1091
7ef8f65d
NA
1092/* Queue a packet for resolution. It gets locked cache entry! */
1093static int ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi,
4b1f0d33 1094 struct sk_buff *skb, struct net_device *dev)
1da177e4 1095{
8fb472c0
NA
1096 const struct iphdr *iph = ip_hdr(skb);
1097 struct mfc_cache *c;
862465f2 1098 bool found = false;
1da177e4 1099 int err;
1da177e4
LT
1100
1101 spin_lock_bh(&mfc_unres_lock);
494fff56 1102 list_for_each_entry(c, &mrt->mfc_unres_queue, _c.list) {
e258beb2 1103 if (c->mfc_mcastgrp == iph->daddr &&
862465f2
PM
1104 c->mfc_origin == iph->saddr) {
1105 found = true;
1da177e4 1106 break;
862465f2 1107 }
1da177e4
LT
1108 }
1109
862465f2 1110 if (!found) {
a8cb16dd 1111 /* Create a new entry if allowable */
0079ad8e
HL
1112 c = ipmr_cache_alloc_unres();
1113 if (!c) {
1da177e4
LT
1114 spin_unlock_bh(&mfc_unres_lock);
1115
1116 kfree_skb(skb);
1117 return -ENOBUFS;
1118 }
1119
a8cb16dd 1120 /* Fill in the new cache entry */
494fff56 1121 c->_c.mfc_parent = -1;
eddc9ec5
ACM
1122 c->mfc_origin = iph->saddr;
1123 c->mfc_mcastgrp = iph->daddr;
1da177e4 1124
a8cb16dd 1125 /* Reflect first query at mrouted. */
0c12295a 1126 err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE);
494fff56 1127
4feb88e5 1128 if (err < 0) {
e905a9ed 1129 /* If the report failed throw the cache entry
1da177e4
LT
1130 out - Brad Parker
1131 */
1132 spin_unlock_bh(&mfc_unres_lock);
1133
5c0a66f5 1134 ipmr_cache_free(c);
1da177e4
LT
1135 kfree_skb(skb);
1136 return err;
1137 }
1138
0c12295a 1139 atomic_inc(&mrt->cache_resolve_queue_len);
494fff56 1140 list_add(&c->_c.list, &mrt->mfc_unres_queue);
8cd3ac9f 1141 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1da177e4 1142
278554bd 1143 if (atomic_read(&mrt->cache_resolve_queue_len) == 1)
494fff56
YM
1144 mod_timer(&mrt->ipmr_expire_timer,
1145 c->_c.mfc_un.unres.expires);
1da177e4
LT
1146 }
1147
a8cb16dd 1148 /* See if we can append the packet */
494fff56 1149 if (c->_c.mfc_un.unres.unresolved.qlen > 3) {
1da177e4
LT
1150 kfree_skb(skb);
1151 err = -ENOBUFS;
1152 } else {
4b1f0d33
DS
1153 if (dev) {
1154 skb->dev = dev;
1155 skb->skb_iif = dev->ifindex;
1156 }
494fff56 1157 skb_queue_tail(&c->_c.mfc_un.unres.unresolved, skb);
1da177e4
LT
1158 err = 0;
1159 }
1160
1161 spin_unlock_bh(&mfc_unres_lock);
1162 return err;
1163}
1164
7ef8f65d 1165/* MFC cache manipulation by user space mroute daemon */
1da177e4 1166
660b26dc 1167static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent)
1da177e4 1168{
b362053a 1169 struct net *net = read_pnet(&mrt->net);
8fb472c0 1170 struct mfc_cache *c;
1da177e4 1171
8fb472c0
NA
1172 /* The entries are added/deleted only under RTNL */
1173 rcu_read_lock();
1174 c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr,
1175 mfc->mfcc_mcastgrp.s_addr, parent);
1176 rcu_read_unlock();
1177 if (!c)
1178 return -ENOENT;
494fff56
YM
1179 rhltable_remove(&mrt->mfc_hash, &c->_c.mnode, ipmr_rht_params);
1180 list_del_rcu(&c->_c.list);
b362053a 1181 call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, c, mrt->id);
8fb472c0 1182 mroute_netlink_event(mrt, c, RTM_DELROUTE);
8c13af2a 1183 mr_cache_put(&c->_c);
1da177e4 1184
8fb472c0 1185 return 0;
1da177e4
LT
1186}
1187
0c12295a 1188static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
660b26dc 1189 struct mfcctl *mfc, int mrtsock, int parent)
1da177e4 1190{
862465f2 1191 struct mfc_cache *uc, *c;
494fff56 1192 struct mr_mfc *_uc;
8fb472c0
NA
1193 bool found;
1194 int ret;
1da177e4 1195
a50436f2
PM
1196 if (mfc->mfcc_parent >= MAXVIFS)
1197 return -ENFILE;
1198
8fb472c0
NA
1199 /* The entries are added/deleted only under RTNL */
1200 rcu_read_lock();
1201 c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr,
1202 mfc->mfcc_mcastgrp.s_addr, parent);
1203 rcu_read_unlock();
1204 if (c) {
1da177e4 1205 write_lock_bh(&mrt_lock);
494fff56
YM
1206 c->_c.mfc_parent = mfc->mfcc_parent;
1207 ipmr_update_thresholds(mrt, &c->_c, mfc->mfcc_ttls);
1da177e4 1208 if (!mrtsock)
494fff56 1209 c->_c.mfc_flags |= MFC_STATIC;
1da177e4 1210 write_unlock_bh(&mrt_lock);
b362053a
YG
1211 call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE, c,
1212 mrt->id);
8cd3ac9f 1213 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1da177e4
LT
1214 return 0;
1215 }
1216
360eb5da 1217 if (mfc->mfcc_mcastgrp.s_addr != htonl(INADDR_ANY) &&
660b26dc 1218 !ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr))
1da177e4
LT
1219 return -EINVAL;
1220
d658f8a0 1221 c = ipmr_cache_alloc();
51456b29 1222 if (!c)
1da177e4
LT
1223 return -ENOMEM;
1224
c354e124
JK
1225 c->mfc_origin = mfc->mfcc_origin.s_addr;
1226 c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr;
494fff56
YM
1227 c->_c.mfc_parent = mfc->mfcc_parent;
1228 ipmr_update_thresholds(mrt, &c->_c, mfc->mfcc_ttls);
1da177e4 1229 if (!mrtsock)
494fff56 1230 c->_c.mfc_flags |= MFC_STATIC;
1da177e4 1231
494fff56 1232 ret = rhltable_insert_key(&mrt->mfc_hash, &c->cmparg, &c->_c.mnode,
8fb472c0
NA
1233 ipmr_rht_params);
1234 if (ret) {
1235 pr_err("ipmr: rhtable insert error %d\n", ret);
1236 ipmr_cache_free(c);
1237 return ret;
1238 }
494fff56 1239 list_add_tail_rcu(&c->_c.list, &mrt->mfc_cache_list);
7ef8f65d
NA
1240 /* Check to see if we resolved a queued list. If so we
1241 * need to send on the frames and tidy up.
1da177e4 1242 */
b0ebb739 1243 found = false;
1da177e4 1244 spin_lock_bh(&mfc_unres_lock);
494fff56
YM
1245 list_for_each_entry(_uc, &mrt->mfc_unres_queue, list) {
1246 uc = (struct mfc_cache *)_uc;
e258beb2 1247 if (uc->mfc_origin == c->mfc_origin &&
1da177e4 1248 uc->mfc_mcastgrp == c->mfc_mcastgrp) {
494fff56 1249 list_del(&_uc->list);
0c12295a 1250 atomic_dec(&mrt->cache_resolve_queue_len);
b0ebb739 1251 found = true;
1da177e4
LT
1252 break;
1253 }
1254 }
0c12295a
PM
1255 if (list_empty(&mrt->mfc_unres_queue))
1256 del_timer(&mrt->ipmr_expire_timer);
1da177e4
LT
1257 spin_unlock_bh(&mfc_unres_lock);
1258
b0ebb739 1259 if (found) {
0c12295a 1260 ipmr_cache_resolve(net, mrt, uc, c);
5c0a66f5 1261 ipmr_cache_free(uc);
1da177e4 1262 }
b362053a 1263 call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_ADD, c, mrt->id);
8cd3ac9f 1264 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1da177e4
LT
1265 return 0;
1266}
1267
7ef8f65d 1268/* Close the multicast socket, and clear the vif tables etc */
ca8d4794 1269static void mroute_clean_tables(struct mr_table *mrt, int flags)
1da177e4 1270{
b362053a 1271 struct net *net = read_pnet(&mrt->net);
494fff56
YM
1272 struct mr_mfc *c, *tmp;
1273 struct mfc_cache *cache;
d17fa6fa 1274 LIST_HEAD(list);
8fb472c0 1275 int i;
e905a9ed 1276
a8cb16dd 1277 /* Shut down all active vif entries */
ca8d4794
CS
1278 if (flags & (MRT_FLUSH_VIFS | MRT_FLUSH_VIFS_STATIC)) {
1279 for (i = 0; i < mrt->maxvif; i++) {
1280 if (((mrt->vif_table[i].flags & VIFF_STATIC) &&
1281 !(flags & MRT_FLUSH_VIFS_STATIC)) ||
1282 (!(mrt->vif_table[i].flags & VIFF_STATIC) && !(flags & MRT_FLUSH_VIFS)))
1283 continue;
1284 vif_delete(mrt, i, 0, &list);
1285 }
1286 unregister_netdevice_many(&list);
1da177e4
LT
1287 }
1288
a8cb16dd 1289 /* Wipe the cache */
ca8d4794
CS
1290 if (flags & (MRT_FLUSH_MFC | MRT_FLUSH_MFC_STATIC)) {
1291 list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) {
1292 if (((c->mfc_flags & MFC_STATIC) && !(flags & MRT_FLUSH_MFC_STATIC)) ||
1293 (!(c->mfc_flags & MFC_STATIC) && !(flags & MRT_FLUSH_MFC)))
1294 continue;
1295 rhltable_remove(&mrt->mfc_hash, &c->mnode, ipmr_rht_params);
1296 list_del_rcu(&c->list);
494fff56 1297 cache = (struct mfc_cache *)c;
ca8d4794
CS
1298 call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, cache,
1299 mrt->id);
494fff56 1300 mroute_netlink_event(mrt, cache, RTM_DELROUTE);
ca8d4794
CS
1301 mr_cache_put(c);
1302 }
1303 }
1304
1305 if (flags & MRT_FLUSH_MFC) {
1306 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1307 spin_lock_bh(&mfc_unres_lock);
1308 list_for_each_entry_safe(c, tmp, &mrt->mfc_unres_queue, list) {
1309 list_del(&c->list);
1310 cache = (struct mfc_cache *)c;
1311 mroute_netlink_event(mrt, cache, RTM_DELROUTE);
1312 ipmr_destroy_unres(mrt, cache);
1313 }
1314 spin_unlock_bh(&mfc_unres_lock);
1da177e4 1315 }
1da177e4
LT
1316 }
1317}
1318
4c968709
ED
1319/* called from ip_ra_control(), before an RCU grace period,
1320 * we dont need to call synchronize_rcu() here
1321 */
1da177e4
LT
1322static void mrtsock_destruct(struct sock *sk)
1323{
4feb88e5 1324 struct net *net = sock_net(sk);
f0ad0860 1325 struct mr_table *mrt;
4feb88e5 1326
128aaa98 1327 rtnl_lock();
f0ad0860 1328 ipmr_for_each_table(mrt, net) {
4c968709 1329 if (sk == rtnl_dereference(mrt->mroute_sk)) {
f0ad0860 1330 IPV4_DEVCONF_ALL(net, MC_FORWARDING)--;
3b022865
DA
1331 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
1332 NETCONFA_MC_FORWARDING,
d67b8c61
ND
1333 NETCONFA_IFINDEX_ALL,
1334 net->ipv4.devconf_all);
a9b3cd7f 1335 RCU_INIT_POINTER(mrt->mroute_sk, NULL);
ca8d4794 1336 mroute_clean_tables(mrt, MRT_FLUSH_VIFS | MRT_FLUSH_MFC);
f0ad0860 1337 }
1da177e4 1338 }
128aaa98 1339 rtnl_unlock();
1da177e4
LT
1340}
1341
7ef8f65d
NA
1342/* Socket options and virtual interface manipulation. The whole
1343 * virtual interface system is a complete heap, but unfortunately
1344 * that's how BSD mrouted happens to think. Maybe one day with a proper
1345 * MOSPF/PIM router set up we can clean this up.
1da177e4 1346 */
e905a9ed 1347
01ccb5b4 1348int ip_mroute_setsockopt(struct sock *sk, int optname, sockptr_t optval,
29e97d21 1349 unsigned int optlen)
1da177e4 1350{
4feb88e5 1351 struct net *net = sock_net(sk);
29e97d21 1352 int val, ret = 0, parent = 0;
f0ad0860 1353 struct mr_table *mrt;
29e97d21
NA
1354 struct vifctl vif;
1355 struct mfcctl mfc;
c921c207 1356 bool do_wrvifwhole;
29e97d21 1357 u32 uval;
f0ad0860 1358
29e97d21
NA
1359 /* There's one exception to the lock - MRT_DONE which needs to unlock */
1360 rtnl_lock();
5e1859fb 1361 if (sk->sk_type != SOCK_RAW ||
29e97d21
NA
1362 inet_sk(sk)->inet_num != IPPROTO_IGMP) {
1363 ret = -EOPNOTSUPP;
1364 goto out_unlock;
1365 }
5e1859fb 1366
f0ad0860 1367 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
29e97d21
NA
1368 if (!mrt) {
1369 ret = -ENOENT;
1370 goto out_unlock;
1371 }
132adf54 1372 if (optname != MRT_INIT) {
33d480ce 1373 if (sk != rcu_access_pointer(mrt->mroute_sk) &&
29e97d21
NA
1374 !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
1375 ret = -EACCES;
1376 goto out_unlock;
1377 }
1da177e4
LT
1378 }
1379
132adf54
SH
1380 switch (optname) {
1381 case MRT_INIT:
42e6b89c 1382 if (optlen != sizeof(int)) {
29e97d21 1383 ret = -EINVAL;
42e6b89c
NA
1384 break;
1385 }
1386 if (rtnl_dereference(mrt->mroute_sk)) {
29e97d21 1387 ret = -EADDRINUSE;
29e97d21 1388 break;
42e6b89c 1389 }
132adf54
SH
1390
1391 ret = ip_ra_control(sk, 1, mrtsock_destruct);
1392 if (ret == 0) {
cf778b00 1393 rcu_assign_pointer(mrt->mroute_sk, sk);
4feb88e5 1394 IPV4_DEVCONF_ALL(net, MC_FORWARDING)++;
3b022865
DA
1395 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
1396 NETCONFA_MC_FORWARDING,
d67b8c61
ND
1397 NETCONFA_IFINDEX_ALL,
1398 net->ipv4.devconf_all);
132adf54 1399 }
29e97d21 1400 break;
132adf54 1401 case MRT_DONE:
29e97d21
NA
1402 if (sk != rcu_access_pointer(mrt->mroute_sk)) {
1403 ret = -EACCES;
1404 } else {
128aaa98
KT
1405 /* We need to unlock here because mrtsock_destruct takes
1406 * care of rtnl itself and we can't change that due to
1407 * the IP_ROUTER_ALERT setsockopt which runs without it.
1408 */
1409 rtnl_unlock();
29e97d21 1410 ret = ip_ra_control(sk, 0, NULL);
128aaa98 1411 goto out;
29e97d21
NA
1412 }
1413 break;
132adf54
SH
1414 case MRT_ADD_VIF:
1415 case MRT_DEL_VIF:
29e97d21
NA
1416 if (optlen != sizeof(vif)) {
1417 ret = -EINVAL;
1418 break;
1419 }
01ccb5b4 1420 if (copy_from_sockptr(&vif, optval, sizeof(vif))) {
29e97d21
NA
1421 ret = -EFAULT;
1422 break;
1423 }
1424 if (vif.vifc_vifi >= MAXVIFS) {
1425 ret = -ENFILE;
1426 break;
1427 }
c354e124 1428 if (optname == MRT_ADD_VIF) {
4c968709
ED
1429 ret = vif_add(net, mrt, &vif,
1430 sk == rtnl_dereference(mrt->mroute_sk));
132adf54 1431 } else {
0c12295a 1432 ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL);
132adf54 1433 }
29e97d21 1434 break;
7ef8f65d
NA
1435 /* Manipulate the forwarding caches. These live
1436 * in a sort of kernel/user symbiosis.
1437 */
132adf54
SH
1438 case MRT_ADD_MFC:
1439 case MRT_DEL_MFC:
660b26dc 1440 parent = -1;
a8eceea8 1441 fallthrough;
660b26dc
ND
1442 case MRT_ADD_MFC_PROXY:
1443 case MRT_DEL_MFC_PROXY:
29e97d21
NA
1444 if (optlen != sizeof(mfc)) {
1445 ret = -EINVAL;
1446 break;
1447 }
73cb1193 1448 if (copy_from_sockptr(&mfc, optval, sizeof(mfc))) {
29e97d21
NA
1449 ret = -EFAULT;
1450 break;
1451 }
660b26dc
ND
1452 if (parent == 0)
1453 parent = mfc.mfcc_parent;
660b26dc
ND
1454 if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY)
1455 ret = ipmr_mfc_delete(mrt, &mfc, parent);
132adf54 1456 else
4c968709 1457 ret = ipmr_mfc_add(net, mrt, &mfc,
660b26dc
ND
1458 sk == rtnl_dereference(mrt->mroute_sk),
1459 parent);
29e97d21 1460 break;
ca8d4794
CS
1461 case MRT_FLUSH:
1462 if (optlen != sizeof(val)) {
1463 ret = -EINVAL;
1464 break;
1465 }
01ccb5b4 1466 if (copy_from_sockptr(&val, optval, sizeof(val))) {
ca8d4794
CS
1467 ret = -EFAULT;
1468 break;
1469 }
1470 mroute_clean_tables(mrt, val);
1471 break;
7ef8f65d 1472 /* Control PIM assert. */
132adf54 1473 case MRT_ASSERT:
29e97d21
NA
1474 if (optlen != sizeof(val)) {
1475 ret = -EINVAL;
1476 break;
1477 }
01ccb5b4 1478 if (copy_from_sockptr(&val, optval, sizeof(val))) {
29e97d21
NA
1479 ret = -EFAULT;
1480 break;
1481 }
1482 mrt->mroute_do_assert = val;
1483 break;
132adf54 1484 case MRT_PIM:
1973a4ea 1485 if (!ipmr_pimsm_enabled()) {
29e97d21
NA
1486 ret = -ENOPROTOOPT;
1487 break;
1488 }
1489 if (optlen != sizeof(val)) {
1490 ret = -EINVAL;
1491 break;
1492 }
01ccb5b4 1493 if (copy_from_sockptr(&val, optval, sizeof(val))) {
29e97d21
NA
1494 ret = -EFAULT;
1495 break;
1496 }
ba93ef74 1497
c921c207 1498 do_wrvifwhole = (val == IGMPMSG_WRVIFWHOLE);
29e97d21
NA
1499 val = !!val;
1500 if (val != mrt->mroute_do_pim) {
1501 mrt->mroute_do_pim = val;
1502 mrt->mroute_do_assert = val;
c921c207 1503 mrt->mroute_do_wrvifwhole = do_wrvifwhole;
1da177e4 1504 }
29e97d21 1505 break;
f0ad0860 1506 case MRT_TABLE:
29e97d21
NA
1507 if (!IS_BUILTIN(CONFIG_IP_MROUTE_MULTIPLE_TABLES)) {
1508 ret = -ENOPROTOOPT;
1509 break;
1510 }
1511 if (optlen != sizeof(uval)) {
1512 ret = -EINVAL;
1513 break;
1514 }
01ccb5b4 1515 if (copy_from_sockptr(&uval, optval, sizeof(uval))) {
29e97d21
NA
1516 ret = -EFAULT;
1517 break;
1518 }
f0ad0860 1519
4c968709
ED
1520 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1521 ret = -EBUSY;
1522 } else {
29e97d21 1523 mrt = ipmr_new_table(net, uval);
1113ebbc
NA
1524 if (IS_ERR(mrt))
1525 ret = PTR_ERR(mrt);
5e1859fb 1526 else
29e97d21 1527 raw_sk(sk)->ipmr_table = uval;
4c968709 1528 }
29e97d21 1529 break;
7ef8f65d 1530 /* Spurious command, or MRT_VERSION which you cannot set. */
132adf54 1531 default:
29e97d21 1532 ret = -ENOPROTOOPT;
1da177e4 1533 }
29e97d21
NA
1534out_unlock:
1535 rtnl_unlock();
128aaa98 1536out:
29e97d21 1537 return ret;
1da177e4
LT
1538}
1539
7ef8f65d 1540/* Getsock opt support for the multicast routing system. */
c354e124 1541int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen)
1da177e4
LT
1542{
1543 int olr;
1544 int val;
4feb88e5 1545 struct net *net = sock_net(sk);
f0ad0860
PM
1546 struct mr_table *mrt;
1547
5e1859fb
ED
1548 if (sk->sk_type != SOCK_RAW ||
1549 inet_sk(sk)->inet_num != IPPROTO_IGMP)
1550 return -EOPNOTSUPP;
1551
f0ad0860 1552 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
51456b29 1553 if (!mrt)
f0ad0860 1554 return -ENOENT;
1da177e4 1555
fe9ef3ce
NA
1556 switch (optname) {
1557 case MRT_VERSION:
1558 val = 0x0305;
1559 break;
1560 case MRT_PIM:
1973a4ea 1561 if (!ipmr_pimsm_enabled())
fe9ef3ce
NA
1562 return -ENOPROTOOPT;
1563 val = mrt->mroute_do_pim;
1564 break;
1565 case MRT_ASSERT:
1566 val = mrt->mroute_do_assert;
1567 break;
1568 default:
1da177e4 1569 return -ENOPROTOOPT;
fe9ef3ce 1570 }
1da177e4
LT
1571
1572 if (get_user(olr, optlen))
1573 return -EFAULT;
1da177e4
LT
1574 olr = min_t(unsigned int, olr, sizeof(int));
1575 if (olr < 0)
1576 return -EINVAL;
c354e124 1577 if (put_user(olr, optlen))
1da177e4 1578 return -EFAULT;
c354e124 1579 if (copy_to_user(optval, &val, olr))
1da177e4
LT
1580 return -EFAULT;
1581 return 0;
1582}
1583
7ef8f65d 1584/* The IP multicast ioctl support routines. */
1da177e4
LT
1585int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg)
1586{
1587 struct sioc_sg_req sr;
1588 struct sioc_vif_req vr;
1589 struct vif_device *vif;
1590 struct mfc_cache *c;
4feb88e5 1591 struct net *net = sock_net(sk);
f0ad0860
PM
1592 struct mr_table *mrt;
1593
1594 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
51456b29 1595 if (!mrt)
f0ad0860 1596 return -ENOENT;
e905a9ed 1597
132adf54
SH
1598 switch (cmd) {
1599 case SIOCGETVIFCNT:
c354e124 1600 if (copy_from_user(&vr, arg, sizeof(vr)))
132adf54 1601 return -EFAULT;
0c12295a 1602 if (vr.vifi >= mrt->maxvif)
132adf54 1603 return -EINVAL;
5648451e 1604 vr.vifi = array_index_nospec(vr.vifi, mrt->maxvif);
132adf54 1605 read_lock(&mrt_lock);
0c12295a
PM
1606 vif = &mrt->vif_table[vr.vifi];
1607 if (VIF_EXISTS(mrt, vr.vifi)) {
c354e124
JK
1608 vr.icount = vif->pkt_in;
1609 vr.ocount = vif->pkt_out;
1610 vr.ibytes = vif->bytes_in;
1611 vr.obytes = vif->bytes_out;
1da177e4 1612 read_unlock(&mrt_lock);
1da177e4 1613
c354e124 1614 if (copy_to_user(arg, &vr, sizeof(vr)))
132adf54
SH
1615 return -EFAULT;
1616 return 0;
1617 }
1618 read_unlock(&mrt_lock);
1619 return -EADDRNOTAVAIL;
1620 case SIOCGETSGCNT:
c354e124 1621 if (copy_from_user(&sr, arg, sizeof(sr)))
132adf54
SH
1622 return -EFAULT;
1623
a8c9486b 1624 rcu_read_lock();
0c12295a 1625 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
132adf54 1626 if (c) {
494fff56
YM
1627 sr.pktcnt = c->_c.mfc_un.res.pkt;
1628 sr.bytecnt = c->_c.mfc_un.res.bytes;
1629 sr.wrong_if = c->_c.mfc_un.res.wrong_if;
a8c9486b 1630 rcu_read_unlock();
132adf54 1631
c354e124 1632 if (copy_to_user(arg, &sr, sizeof(sr)))
132adf54
SH
1633 return -EFAULT;
1634 return 0;
1635 }
a8c9486b 1636 rcu_read_unlock();
132adf54
SH
1637 return -EADDRNOTAVAIL;
1638 default:
1639 return -ENOIOCTLCMD;
1da177e4
LT
1640 }
1641}
1642
709b46e8
EB
1643#ifdef CONFIG_COMPAT
1644struct compat_sioc_sg_req {
1645 struct in_addr src;
1646 struct in_addr grp;
1647 compat_ulong_t pktcnt;
1648 compat_ulong_t bytecnt;
1649 compat_ulong_t wrong_if;
1650};
1651
ca6b8bb0
DM
1652struct compat_sioc_vif_req {
1653 vifi_t vifi; /* Which iface */
1654 compat_ulong_t icount;
1655 compat_ulong_t ocount;
1656 compat_ulong_t ibytes;
1657 compat_ulong_t obytes;
1658};
1659
709b46e8
EB
1660int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1661{
0033d5ad 1662 struct compat_sioc_sg_req sr;
ca6b8bb0
DM
1663 struct compat_sioc_vif_req vr;
1664 struct vif_device *vif;
709b46e8
EB
1665 struct mfc_cache *c;
1666 struct net *net = sock_net(sk);
1667 struct mr_table *mrt;
1668
1669 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
51456b29 1670 if (!mrt)
709b46e8
EB
1671 return -ENOENT;
1672
1673 switch (cmd) {
ca6b8bb0
DM
1674 case SIOCGETVIFCNT:
1675 if (copy_from_user(&vr, arg, sizeof(vr)))
1676 return -EFAULT;
1677 if (vr.vifi >= mrt->maxvif)
1678 return -EINVAL;
5648451e 1679 vr.vifi = array_index_nospec(vr.vifi, mrt->maxvif);
ca6b8bb0
DM
1680 read_lock(&mrt_lock);
1681 vif = &mrt->vif_table[vr.vifi];
1682 if (VIF_EXISTS(mrt, vr.vifi)) {
1683 vr.icount = vif->pkt_in;
1684 vr.ocount = vif->pkt_out;
1685 vr.ibytes = vif->bytes_in;
1686 vr.obytes = vif->bytes_out;
1687 read_unlock(&mrt_lock);
1688
1689 if (copy_to_user(arg, &vr, sizeof(vr)))
1690 return -EFAULT;
1691 return 0;
1692 }
1693 read_unlock(&mrt_lock);
1694 return -EADDRNOTAVAIL;
709b46e8
EB
1695 case SIOCGETSGCNT:
1696 if (copy_from_user(&sr, arg, sizeof(sr)))
1697 return -EFAULT;
1698
1699 rcu_read_lock();
1700 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
1701 if (c) {
494fff56
YM
1702 sr.pktcnt = c->_c.mfc_un.res.pkt;
1703 sr.bytecnt = c->_c.mfc_un.res.bytes;
1704 sr.wrong_if = c->_c.mfc_un.res.wrong_if;
709b46e8
EB
1705 rcu_read_unlock();
1706
1707 if (copy_to_user(arg, &sr, sizeof(sr)))
1708 return -EFAULT;
1709 return 0;
1710 }
1711 rcu_read_unlock();
1712 return -EADDRNOTAVAIL;
1713 default:
1714 return -ENOIOCTLCMD;
1715 }
1716}
1717#endif
1718
1da177e4
LT
1719static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
1720{
351638e7 1721 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4feb88e5 1722 struct net *net = dev_net(dev);
f0ad0860 1723 struct mr_table *mrt;
1da177e4
LT
1724 struct vif_device *v;
1725 int ct;
e9dc8653 1726
1da177e4
LT
1727 if (event != NETDEV_UNREGISTER)
1728 return NOTIFY_DONE;
f0ad0860
PM
1729
1730 ipmr_for_each_table(mrt, net) {
1731 v = &mrt->vif_table[0];
1732 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1733 if (v->dev == dev)
e92036a6 1734 vif_delete(mrt, ct, 1, NULL);
f0ad0860 1735 }
1da177e4
LT
1736 }
1737 return NOTIFY_DONE;
1738}
1739
c354e124 1740static struct notifier_block ip_mr_notifier = {
1da177e4
LT
1741 .notifier_call = ipmr_device_event,
1742};
1743
7ef8f65d
NA
1744/* Encapsulate a packet by attaching a valid IPIP header to it.
1745 * This avoids tunnel drivers and other mess and gives us the speed so
1746 * important for multicast video.
1da177e4 1747 */
b6a7719a
HFS
1748static void ip_encap(struct net *net, struct sk_buff *skb,
1749 __be32 saddr, __be32 daddr)
1da177e4 1750{
8856dfa3 1751 struct iphdr *iph;
b71d1d42 1752 const struct iphdr *old_iph = ip_hdr(skb);
8856dfa3
ACM
1753
1754 skb_push(skb, sizeof(struct iphdr));
b0e380b1 1755 skb->transport_header = skb->network_header;
8856dfa3 1756 skb_reset_network_header(skb);
eddc9ec5 1757 iph = ip_hdr(skb);
1da177e4 1758
a8cb16dd 1759 iph->version = 4;
e023dd64
ACM
1760 iph->tos = old_iph->tos;
1761 iph->ttl = old_iph->ttl;
1da177e4
LT
1762 iph->frag_off = 0;
1763 iph->daddr = daddr;
1764 iph->saddr = saddr;
1765 iph->protocol = IPPROTO_IPIP;
1766 iph->ihl = 5;
1767 iph->tot_len = htons(skb->len);
b6a7719a 1768 ip_select_ident(net, skb, NULL);
1da177e4
LT
1769 ip_send_check(iph);
1770
1da177e4 1771 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
895b5c9f 1772 nf_reset_ct(skb);
1da177e4
LT
1773}
1774
0c4b51f0
EB
1775static inline int ipmr_forward_finish(struct net *net, struct sock *sk,
1776 struct sk_buff *skb)
1da177e4 1777{
a8cb16dd 1778 struct ip_options *opt = &(IPCB(skb)->opt);
1da177e4 1779
73186df8
DM
1780 IP_INC_STATS(net, IPSTATS_MIB_OUTFORWDATAGRAMS);
1781 IP_ADD_STATS(net, IPSTATS_MIB_OUTOCTETS, skb->len);
1da177e4
LT
1782
1783 if (unlikely(opt->optlen))
1784 ip_forward_options(skb);
1785
13206b6b 1786 return dst_output(net, sk, skb);
1da177e4
LT
1787}
1788
a5bc9294
YG
1789#ifdef CONFIG_NET_SWITCHDEV
1790static bool ipmr_forward_offloaded(struct sk_buff *skb, struct mr_table *mrt,
1791 int in_vifi, int out_vifi)
1792{
1793 struct vif_device *out_vif = &mrt->vif_table[out_vifi];
1794 struct vif_device *in_vif = &mrt->vif_table[in_vifi];
1795
875e8939 1796 if (!skb->offload_l3_fwd_mark)
a5bc9294
YG
1797 return false;
1798 if (!out_vif->dev_parent_id.id_len || !in_vif->dev_parent_id.id_len)
1799 return false;
1800 return netdev_phys_item_id_same(&out_vif->dev_parent_id,
1801 &in_vif->dev_parent_id);
1802}
1803#else
1804static bool ipmr_forward_offloaded(struct sk_buff *skb, struct mr_table *mrt,
1805 int in_vifi, int out_vifi)
1806{
1807 return false;
1808}
1809#endif
1810
7ef8f65d 1811/* Processing handlers for ipmr_forward */
1da177e4 1812
0c12295a 1813static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
6e0735d1 1814 int in_vifi, struct sk_buff *skb, int vifi)
1da177e4 1815{
eddc9ec5 1816 const struct iphdr *iph = ip_hdr(skb);
0c12295a 1817 struct vif_device *vif = &mrt->vif_table[vifi];
1da177e4
LT
1818 struct net_device *dev;
1819 struct rtable *rt;
31e4543d 1820 struct flowi4 fl4;
1da177e4
LT
1821 int encap = 0;
1822
51456b29 1823 if (!vif->dev)
1da177e4
LT
1824 goto out_free;
1825
1da177e4
LT
1826 if (vif->flags & VIFF_REGISTER) {
1827 vif->pkt_out++;
c354e124 1828 vif->bytes_out += skb->len;
cf3677ae
PE
1829 vif->dev->stats.tx_bytes += skb->len;
1830 vif->dev->stats.tx_packets++;
0c12295a 1831 ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT);
69ebbf58 1832 goto out_free;
1da177e4 1833 }
1da177e4 1834
a5bc9294
YG
1835 if (ipmr_forward_offloaded(skb, mrt, in_vifi, vifi))
1836 goto out_free;
1837
a8cb16dd 1838 if (vif->flags & VIFF_TUNNEL) {
31e4543d 1839 rt = ip_route_output_ports(net, &fl4, NULL,
78fbfd8a
DM
1840 vif->remote, vif->local,
1841 0, 0,
1842 IPPROTO_IPIP,
1843 RT_TOS(iph->tos), vif->link);
b23dd4fe 1844 if (IS_ERR(rt))
1da177e4
LT
1845 goto out_free;
1846 encap = sizeof(struct iphdr);
1847 } else {
31e4543d 1848 rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0,
78fbfd8a
DM
1849 0, 0,
1850 IPPROTO_IPIP,
1851 RT_TOS(iph->tos), vif->link);
b23dd4fe 1852 if (IS_ERR(rt))
1da177e4
LT
1853 goto out_free;
1854 }
1855
d8d1f30b 1856 dev = rt->dst.dev;
1da177e4 1857
d8d1f30b 1858 if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) {
1da177e4 1859 /* Do not fragment multicasts. Alas, IPv4 does not
a8cb16dd
ED
1860 * allow to send ICMP, so that packets will disappear
1861 * to blackhole.
1da177e4 1862 */
73186df8 1863 IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS);
1da177e4
LT
1864 ip_rt_put(rt);
1865 goto out_free;
1866 }
1867
d8d1f30b 1868 encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len;
1da177e4
LT
1869
1870 if (skb_cow(skb, encap)) {
e905a9ed 1871 ip_rt_put(rt);
1da177e4
LT
1872 goto out_free;
1873 }
1874
1875 vif->pkt_out++;
c354e124 1876 vif->bytes_out += skb->len;
1da177e4 1877
adf30907 1878 skb_dst_drop(skb);
d8d1f30b 1879 skb_dst_set(skb, &rt->dst);
eddc9ec5 1880 ip_decrease_ttl(ip_hdr(skb));
1da177e4
LT
1881
1882 /* FIXME: forward and output firewalls used to be called here.
a8cb16dd
ED
1883 * What do we do with netfilter? -- RR
1884 */
1da177e4 1885 if (vif->flags & VIFF_TUNNEL) {
b6a7719a 1886 ip_encap(net, skb, vif->local, vif->remote);
1da177e4 1887 /* FIXME: extra output firewall step used to be here. --RR */
2f4c02d4
PE
1888 vif->dev->stats.tx_packets++;
1889 vif->dev->stats.tx_bytes += skb->len;
1da177e4
LT
1890 }
1891
9ee6c5dc 1892 IPCB(skb)->flags |= IPSKB_FORWARDED;
1da177e4 1893
7ef8f65d 1894 /* RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
1da177e4
LT
1895 * not only before forwarding, but after forwarding on all output
1896 * interfaces. It is clear, if mrouter runs a multicasting
1897 * program, it should receive packets not depending to what interface
1898 * program is joined.
1899 * If we will not make it, the program will have to join on all
1900 * interfaces. On the other hand, multihoming host (or router, but
1901 * not mrouter) cannot join to more than one interface - it will
1902 * result in receiving multiple packets.
1903 */
29a26a56
EB
1904 NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD,
1905 net, NULL, skb, skb->dev, dev,
1da177e4
LT
1906 ipmr_forward_finish);
1907 return;
1908
1909out_free:
1910 kfree_skb(skb);
1da177e4
LT
1911}
1912
0c12295a 1913static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev)
1da177e4
LT
1914{
1915 int ct;
0c12295a
PM
1916
1917 for (ct = mrt->maxvif-1; ct >= 0; ct--) {
1918 if (mrt->vif_table[ct].dev == dev)
1da177e4
LT
1919 break;
1920 }
1921 return ct;
1922}
1923
1924/* "local" means that we should preserve one skb (for local delivery) */
c4854ec8 1925static void ip_mr_forward(struct net *net, struct mr_table *mrt,
4b1f0d33 1926 struct net_device *dev, struct sk_buff *skb,
494fff56 1927 struct mfc_cache *c, int local)
1da177e4 1928{
4b1f0d33 1929 int true_vifi = ipmr_find_vif(mrt, dev);
1da177e4
LT
1930 int psend = -1;
1931 int vif, ct;
1932
494fff56
YM
1933 vif = c->_c.mfc_parent;
1934 c->_c.mfc_un.res.pkt++;
1935 c->_c.mfc_un.res.bytes += skb->len;
1936 c->_c.mfc_un.res.lastuse = jiffies;
1da177e4 1937
494fff56 1938 if (c->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) {
660b26dc
ND
1939 struct mfc_cache *cache_proxy;
1940
1941 /* For an (*,G) entry, we only check that the incomming
1942 * interface is part of the static tree.
1943 */
845c9a7a 1944 cache_proxy = mr_mfc_find_any_parent(mrt, vif);
660b26dc 1945 if (cache_proxy &&
494fff56 1946 cache_proxy->_c.mfc_un.res.ttls[true_vifi] < 255)
660b26dc
ND
1947 goto forward;
1948 }
1949
7ef8f65d 1950 /* Wrong interface: drop packet and (maybe) send PIM assert. */
4b1f0d33 1951 if (mrt->vif_table[vif].dev != dev) {
c7537967 1952 if (rt_is_output_route(skb_rtable(skb))) {
1da177e4 1953 /* It is our own packet, looped back.
a8cb16dd
ED
1954 * Very complicated situation...
1955 *
1956 * The best workaround until routing daemons will be
1957 * fixed is not to redistribute packet, if it was
1958 * send through wrong interface. It means, that
1959 * multicast applications WILL NOT work for
1960 * (S,G), which have default multicast route pointing
1961 * to wrong oif. In any case, it is not a good
1962 * idea to use multicasting applications on router.
1da177e4
LT
1963 */
1964 goto dont_forward;
1965 }
1966
494fff56 1967 c->_c.mfc_un.res.wrong_if++;
1da177e4 1968
0c12295a 1969 if (true_vifi >= 0 && mrt->mroute_do_assert &&
1da177e4 1970 /* pimsm uses asserts, when switching from RPT to SPT,
a8cb16dd
ED
1971 * so that we cannot check that packet arrived on an oif.
1972 * It is bad, but otherwise we would need to move pretty
1973 * large chunk of pimd to kernel. Ough... --ANK
1da177e4 1974 */
0c12295a 1975 (mrt->mroute_do_pim ||
494fff56 1976 c->_c.mfc_un.res.ttls[true_vifi] < 255) &&
e905a9ed 1977 time_after(jiffies,
494fff56
YM
1978 c->_c.mfc_un.res.last_assert +
1979 MFC_ASSERT_THRESH)) {
1980 c->_c.mfc_un.res.last_assert = jiffies;
0c12295a 1981 ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF);
c921c207
NA
1982 if (mrt->mroute_do_wrvifwhole)
1983 ipmr_cache_report(mrt, skb, true_vifi,
1984 IGMPMSG_WRVIFWHOLE);
1da177e4
LT
1985 }
1986 goto dont_forward;
1987 }
1988
660b26dc 1989forward:
0c12295a
PM
1990 mrt->vif_table[vif].pkt_in++;
1991 mrt->vif_table[vif].bytes_in += skb->len;
1da177e4 1992
7ef8f65d 1993 /* Forward the frame */
494fff56
YM
1994 if (c->mfc_origin == htonl(INADDR_ANY) &&
1995 c->mfc_mcastgrp == htonl(INADDR_ANY)) {
660b26dc 1996 if (true_vifi >= 0 &&
494fff56 1997 true_vifi != c->_c.mfc_parent &&
660b26dc 1998 ip_hdr(skb)->ttl >
494fff56 1999 c->_c.mfc_un.res.ttls[c->_c.mfc_parent]) {
660b26dc
ND
2000 /* It's an (*,*) entry and the packet is not coming from
2001 * the upstream: forward the packet to the upstream
2002 * only.
2003 */
494fff56 2004 psend = c->_c.mfc_parent;
660b26dc
ND
2005 goto last_forward;
2006 }
2007 goto dont_forward;
2008 }
494fff56
YM
2009 for (ct = c->_c.mfc_un.res.maxvif - 1;
2010 ct >= c->_c.mfc_un.res.minvif; ct--) {
660b26dc 2011 /* For (*,G) entry, don't forward to the incoming interface */
494fff56 2012 if ((c->mfc_origin != htonl(INADDR_ANY) ||
360eb5da 2013 ct != true_vifi) &&
494fff56 2014 ip_hdr(skb)->ttl > c->_c.mfc_un.res.ttls[ct]) {
1da177e4
LT
2015 if (psend != -1) {
2016 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
a8cb16dd 2017
1da177e4 2018 if (skb2)
a5bc9294 2019 ipmr_queue_xmit(net, mrt, true_vifi,
6e0735d1 2020 skb2, psend);
1da177e4 2021 }
c354e124 2022 psend = ct;
1da177e4
LT
2023 }
2024 }
660b26dc 2025last_forward:
1da177e4
LT
2026 if (psend != -1) {
2027 if (local) {
2028 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
a8cb16dd 2029
1da177e4 2030 if (skb2)
a5bc9294 2031 ipmr_queue_xmit(net, mrt, true_vifi, skb2,
6e0735d1 2032 psend);
1da177e4 2033 } else {
6e0735d1 2034 ipmr_queue_xmit(net, mrt, true_vifi, skb, psend);
c4854ec8 2035 return;
1da177e4
LT
2036 }
2037 }
2038
2039dont_forward:
2040 if (!local)
2041 kfree_skb(skb);
1da177e4
LT
2042}
2043
417da66f 2044static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb)
ee3f1aaf 2045{
417da66f
DM
2046 struct rtable *rt = skb_rtable(skb);
2047 struct iphdr *iph = ip_hdr(skb);
da91981b 2048 struct flowi4 fl4 = {
417da66f
DM
2049 .daddr = iph->daddr,
2050 .saddr = iph->saddr,
b0fe4a31 2051 .flowi4_tos = RT_TOS(iph->tos),
4fd551d7
DM
2052 .flowi4_oif = (rt_is_output_route(rt) ?
2053 skb->dev->ifindex : 0),
2054 .flowi4_iif = (rt_is_output_route(rt) ?
1fb9489b 2055 LOOPBACK_IFINDEX :
4fd551d7 2056 skb->dev->ifindex),
b4869889 2057 .flowi4_mark = skb->mark,
ee3f1aaf
DM
2058 };
2059 struct mr_table *mrt;
2060 int err;
2061
da91981b 2062 err = ipmr_fib_lookup(net, &fl4, &mrt);
ee3f1aaf
DM
2063 if (err)
2064 return ERR_PTR(err);
2065 return mrt;
2066}
1da177e4 2067
7ef8f65d
NA
2068/* Multicast packets for forwarding arrive here
2069 * Called with rcu_read_lock();
1da177e4 2070 */
1da177e4
LT
2071int ip_mr_input(struct sk_buff *skb)
2072{
2073 struct mfc_cache *cache;
4feb88e5 2074 struct net *net = dev_net(skb->dev);
511c3f92 2075 int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL;
f0ad0860 2076 struct mr_table *mrt;
bcfc7d33
TW
2077 struct net_device *dev;
2078
2079 /* skb->dev passed in is the loX master dev for vrfs.
2080 * As there are no vifs associated with loopback devices,
2081 * get the proper interface that does have a vif associated with it.
2082 */
2083 dev = skb->dev;
2084 if (netif_is_l3_master(skb->dev)) {
2085 dev = dev_get_by_index_rcu(net, IPCB(skb)->iif);
2086 if (!dev) {
2087 kfree_skb(skb);
2088 return -ENODEV;
2089 }
2090 }
1da177e4
LT
2091
2092 /* Packet is looped back after forward, it should not be
a8cb16dd 2093 * forwarded second time, but still can be delivered locally.
1da177e4 2094 */
4c968709 2095 if (IPCB(skb)->flags & IPSKB_FORWARDED)
1da177e4
LT
2096 goto dont_forward;
2097
417da66f 2098 mrt = ipmr_rt_fib_lookup(net, skb);
ee3f1aaf
DM
2099 if (IS_ERR(mrt)) {
2100 kfree_skb(skb);
2101 return PTR_ERR(mrt);
e40dbc51 2102 }
1da177e4 2103 if (!local) {
4c968709
ED
2104 if (IPCB(skb)->opt.router_alert) {
2105 if (ip_call_ra_chain(skb))
2106 return 0;
2107 } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) {
2108 /* IGMPv1 (and broken IGMPv2 implementations sort of
2109 * Cisco IOS <= 11.2(8)) do not put router alert
2110 * option to IGMP packets destined to routable
2111 * groups. It is very bad, because it means
2112 * that we can forward NO IGMP messages.
2113 */
2114 struct sock *mroute_sk;
2115
2116 mroute_sk = rcu_dereference(mrt->mroute_sk);
2117 if (mroute_sk) {
895b5c9f 2118 nf_reset_ct(skb);
4c968709
ED
2119 raw_rcv(mroute_sk, skb);
2120 return 0;
2121 }
1da177e4
LT
2122 }
2123 }
2124
a8c9486b 2125 /* already under rcu_read_lock() */
0c12295a 2126 cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
51456b29 2127 if (!cache) {
bcfc7d33 2128 int vif = ipmr_find_vif(mrt, dev);
660b26dc
ND
2129
2130 if (vif >= 0)
2131 cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr,
2132 vif);
2133 }
1da177e4 2134
7ef8f65d 2135 /* No usable cache entry */
51456b29 2136 if (!cache) {
1da177e4
LT
2137 int vif;
2138
2139 if (local) {
2140 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2141 ip_local_deliver(skb);
51456b29 2142 if (!skb2)
1da177e4 2143 return -ENOBUFS;
1da177e4
LT
2144 skb = skb2;
2145 }
2146
a8c9486b 2147 read_lock(&mrt_lock);
bcfc7d33 2148 vif = ipmr_find_vif(mrt, dev);
1da177e4 2149 if (vif >= 0) {
4b1f0d33 2150 int err2 = ipmr_cache_unresolved(mrt, vif, skb, dev);
1da177e4
LT
2151 read_unlock(&mrt_lock);
2152
0eae88f3 2153 return err2;
1da177e4
LT
2154 }
2155 read_unlock(&mrt_lock);
2156 kfree_skb(skb);
2157 return -ENODEV;
2158 }
2159
a8c9486b 2160 read_lock(&mrt_lock);
4b1f0d33 2161 ip_mr_forward(net, mrt, dev, skb, cache, local);
1da177e4
LT
2162 read_unlock(&mrt_lock);
2163
2164 if (local)
2165 return ip_local_deliver(skb);
2166
2167 return 0;
2168
2169dont_forward:
2170 if (local)
2171 return ip_local_deliver(skb);
2172 kfree_skb(skb);
2173 return 0;
2174}
2175
b1879204 2176#ifdef CONFIG_IP_PIMSM_V1
7ef8f65d 2177/* Handle IGMP messages of PIMv1 */
a8cb16dd 2178int pim_rcv_v1(struct sk_buff *skb)
b1879204
IJ
2179{
2180 struct igmphdr *pim;
4feb88e5 2181 struct net *net = dev_net(skb->dev);
f0ad0860 2182 struct mr_table *mrt;
b1879204
IJ
2183
2184 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
2185 goto drop;
2186
2187 pim = igmp_hdr(skb);
2188
417da66f 2189 mrt = ipmr_rt_fib_lookup(net, skb);
ee3f1aaf
DM
2190 if (IS_ERR(mrt))
2191 goto drop;
0c12295a 2192 if (!mrt->mroute_do_pim ||
b1879204
IJ
2193 pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER)
2194 goto drop;
2195
f0ad0860 2196 if (__pim_rcv(mrt, skb, sizeof(*pim))) {
b1879204
IJ
2197drop:
2198 kfree_skb(skb);
2199 }
1da177e4
LT
2200 return 0;
2201}
2202#endif
2203
2204#ifdef CONFIG_IP_PIMSM_V2
a8cb16dd 2205static int pim_rcv(struct sk_buff *skb)
1da177e4
LT
2206{
2207 struct pimreghdr *pim;
f0ad0860
PM
2208 struct net *net = dev_net(skb->dev);
2209 struct mr_table *mrt;
1da177e4 2210
b1879204 2211 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
1da177e4
LT
2212 goto drop;
2213
9c70220b 2214 pim = (struct pimreghdr *)skb_transport_header(skb);
56245cae 2215 if (pim->type != ((PIM_VERSION << 4) | (PIM_TYPE_REGISTER)) ||
a8cb16dd 2216 (pim->flags & PIM_NULL_REGISTER) ||
e905a9ed 2217 (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 &&
d3bc23e7 2218 csum_fold(skb_checksum(skb, 0, skb->len, 0))))
1da177e4
LT
2219 goto drop;
2220
417da66f 2221 mrt = ipmr_rt_fib_lookup(net, skb);
ee3f1aaf
DM
2222 if (IS_ERR(mrt))
2223 goto drop;
f0ad0860 2224 if (__pim_rcv(mrt, skb, sizeof(*pim))) {
b1879204
IJ
2225drop:
2226 kfree_skb(skb);
2227 }
1da177e4
LT
2228 return 0;
2229}
2230#endif
2231
9a1b9496
DM
2232int ipmr_get_route(struct net *net, struct sk_buff *skb,
2233 __be32 saddr, __be32 daddr,
9f09eaea 2234 struct rtmsg *rtm, u32 portid)
1da177e4 2235{
1da177e4 2236 struct mfc_cache *cache;
9a1b9496
DM
2237 struct mr_table *mrt;
2238 int err;
1da177e4 2239
f0ad0860 2240 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
51456b29 2241 if (!mrt)
f0ad0860
PM
2242 return -ENOENT;
2243
a8c9486b 2244 rcu_read_lock();
9a1b9496 2245 cache = ipmr_cache_find(mrt, saddr, daddr);
51456b29 2246 if (!cache && skb->dev) {
660b26dc 2247 int vif = ipmr_find_vif(mrt, skb->dev);
1da177e4 2248
660b26dc
ND
2249 if (vif >= 0)
2250 cache = ipmr_cache_find_any(mrt, daddr, vif);
2251 }
51456b29 2252 if (!cache) {
72287490 2253 struct sk_buff *skb2;
eddc9ec5 2254 struct iphdr *iph;
1da177e4 2255 struct net_device *dev;
a8cb16dd 2256 int vif = -1;
1da177e4 2257
1da177e4 2258 dev = skb->dev;
a8c9486b 2259 read_lock(&mrt_lock);
a8cb16dd
ED
2260 if (dev)
2261 vif = ipmr_find_vif(mrt, dev);
2262 if (vif < 0) {
1da177e4 2263 read_unlock(&mrt_lock);
a8c9486b 2264 rcu_read_unlock();
1da177e4
LT
2265 return -ENODEV;
2266 }
7901cd97
GN
2267
2268 skb2 = skb_realloc_headroom(skb, sizeof(struct iphdr));
72287490
AK
2269 if (!skb2) {
2270 read_unlock(&mrt_lock);
a8c9486b 2271 rcu_read_unlock();
72287490
AK
2272 return -ENOMEM;
2273 }
2274
2cf75070 2275 NETLINK_CB(skb2).portid = portid;
e2d1bca7
ACM
2276 skb_push(skb2, sizeof(struct iphdr));
2277 skb_reset_network_header(skb2);
eddc9ec5
ACM
2278 iph = ip_hdr(skb2);
2279 iph->ihl = sizeof(struct iphdr) >> 2;
9a1b9496
DM
2280 iph->saddr = saddr;
2281 iph->daddr = daddr;
eddc9ec5 2282 iph->version = 0;
4b1f0d33 2283 err = ipmr_cache_unresolved(mrt, vif, skb2, dev);
1da177e4 2284 read_unlock(&mrt_lock);
a8c9486b 2285 rcu_read_unlock();
1da177e4
LT
2286 return err;
2287 }
2288
a8c9486b 2289 read_lock(&mrt_lock);
7b0db857 2290 err = mr_fill_mroute(mrt, skb, &cache->_c, rtm);
1da177e4 2291 read_unlock(&mrt_lock);
a8c9486b 2292 rcu_read_unlock();
1da177e4
LT
2293 return err;
2294}
2295
cb6a4e46 2296static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
65886f43
ND
2297 u32 portid, u32 seq, struct mfc_cache *c, int cmd,
2298 int flags)
cb6a4e46
PM
2299{
2300 struct nlmsghdr *nlh;
2301 struct rtmsg *rtm;
1eb99af5 2302 int err;
cb6a4e46 2303
65886f43 2304 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
51456b29 2305 if (!nlh)
cb6a4e46
PM
2306 return -EMSGSIZE;
2307
2308 rtm = nlmsg_data(nlh);
2309 rtm->rtm_family = RTNL_FAMILY_IPMR;
2310 rtm->rtm_dst_len = 32;
2311 rtm->rtm_src_len = 32;
2312 rtm->rtm_tos = 0;
2313 rtm->rtm_table = mrt->id;
f3756b79
DM
2314 if (nla_put_u32(skb, RTA_TABLE, mrt->id))
2315 goto nla_put_failure;
cb6a4e46
PM
2316 rtm->rtm_type = RTN_MULTICAST;
2317 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
494fff56 2318 if (c->_c.mfc_flags & MFC_STATIC)
9a68ac72
ND
2319 rtm->rtm_protocol = RTPROT_STATIC;
2320 else
2321 rtm->rtm_protocol = RTPROT_MROUTED;
cb6a4e46
PM
2322 rtm->rtm_flags = 0;
2323
930345ea
JB
2324 if (nla_put_in_addr(skb, RTA_SRC, c->mfc_origin) ||
2325 nla_put_in_addr(skb, RTA_DST, c->mfc_mcastgrp))
f3756b79 2326 goto nla_put_failure;
7b0db857 2327 err = mr_fill_mroute(mrt, skb, &c->_c, rtm);
1eb99af5
ND
2328 /* do not break the dump if cache is unresolved */
2329 if (err < 0 && err != -ENOENT)
cb6a4e46
PM
2330 goto nla_put_failure;
2331
053c095a
JB
2332 nlmsg_end(skb, nlh);
2333 return 0;
cb6a4e46
PM
2334
2335nla_put_failure:
2336 nlmsg_cancel(skb, nlh);
2337 return -EMSGSIZE;
2338}
2339
7b0db857
YM
2340static int _ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2341 u32 portid, u32 seq, struct mr_mfc *c, int cmd,
2342 int flags)
2343{
2344 return ipmr_fill_mroute(mrt, skb, portid, seq, (struct mfc_cache *)c,
2345 cmd, flags);
2346}
2347
8cd3ac9f
ND
2348static size_t mroute_msgsize(bool unresolved, int maxvif)
2349{
2350 size_t len =
2351 NLMSG_ALIGN(sizeof(struct rtmsg))
2352 + nla_total_size(4) /* RTA_TABLE */
2353 + nla_total_size(4) /* RTA_SRC */
2354 + nla_total_size(4) /* RTA_DST */
2355 ;
2356
2357 if (!unresolved)
2358 len = len
2359 + nla_total_size(4) /* RTA_IIF */
2360 + nla_total_size(0) /* RTA_MULTIPATH */
2361 + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
2362 /* RTA_MFC_STATS */
a9a08042 2363 + nla_total_size_64bit(sizeof(struct rta_mfc_stats))
8cd3ac9f
ND
2364 ;
2365
2366 return len;
2367}
2368
2369static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
2370 int cmd)
2371{
2372 struct net *net = read_pnet(&mrt->net);
2373 struct sk_buff *skb;
2374 int err = -ENOBUFS;
2375
494fff56
YM
2376 skb = nlmsg_new(mroute_msgsize(mfc->_c.mfc_parent >= MAXVIFS,
2377 mrt->maxvif),
8cd3ac9f 2378 GFP_ATOMIC);
51456b29 2379 if (!skb)
8cd3ac9f
ND
2380 goto errout;
2381
65886f43 2382 err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
8cd3ac9f
ND
2383 if (err < 0)
2384 goto errout;
2385
2386 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE, NULL, GFP_ATOMIC);
2387 return;
2388
2389errout:
2390 kfree_skb(skb);
2391 if (err < 0)
2392 rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE, err);
2393}
2394
5a645dd8
JG
2395static size_t igmpmsg_netlink_msgsize(size_t payloadlen)
2396{
2397 size_t len =
2398 NLMSG_ALIGN(sizeof(struct rtgenmsg))
2399 + nla_total_size(1) /* IPMRA_CREPORT_MSGTYPE */
2400 + nla_total_size(4) /* IPMRA_CREPORT_VIF_ID */
2401 + nla_total_size(4) /* IPMRA_CREPORT_SRC_ADDR */
2402 + nla_total_size(4) /* IPMRA_CREPORT_DST_ADDR */
501cb008 2403 + nla_total_size(4) /* IPMRA_CREPORT_TABLE */
5a645dd8
JG
2404 /* IPMRA_CREPORT_PKT */
2405 + nla_total_size(payloadlen)
2406 ;
2407
2408 return len;
2409}
2410
2411static void igmpmsg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt)
2412{
2413 struct net *net = read_pnet(&mrt->net);
2414 struct nlmsghdr *nlh;
2415 struct rtgenmsg *rtgenm;
2416 struct igmpmsg *msg;
2417 struct sk_buff *skb;
2418 struct nlattr *nla;
2419 int payloadlen;
2420
2421 payloadlen = pkt->len - sizeof(struct igmpmsg);
2422 msg = (struct igmpmsg *)skb_network_header(pkt);
2423
2424 skb = nlmsg_new(igmpmsg_netlink_msgsize(payloadlen), GFP_ATOMIC);
2425 if (!skb)
2426 goto errout;
2427
2428 nlh = nlmsg_put(skb, 0, 0, RTM_NEWCACHEREPORT,
2429 sizeof(struct rtgenmsg), 0);
2430 if (!nlh)
2431 goto errout;
2432 rtgenm = nlmsg_data(nlh);
2433 rtgenm->rtgen_family = RTNL_FAMILY_IPMR;
2434 if (nla_put_u8(skb, IPMRA_CREPORT_MSGTYPE, msg->im_msgtype) ||
bb82067c 2435 nla_put_u32(skb, IPMRA_CREPORT_VIF_ID, msg->im_vif | (msg->im_vif_hi << 8)) ||
5a645dd8
JG
2436 nla_put_in_addr(skb, IPMRA_CREPORT_SRC_ADDR,
2437 msg->im_src.s_addr) ||
2438 nla_put_in_addr(skb, IPMRA_CREPORT_DST_ADDR,
501cb008
PD
2439 msg->im_dst.s_addr) ||
2440 nla_put_u32(skb, IPMRA_CREPORT_TABLE, mrt->id))
5a645dd8
JG
2441 goto nla_put_failure;
2442
2443 nla = nla_reserve(skb, IPMRA_CREPORT_PKT, payloadlen);
2444 if (!nla || skb_copy_bits(pkt, sizeof(struct igmpmsg),
2445 nla_data(nla), payloadlen))
2446 goto nla_put_failure;
2447
2448 nlmsg_end(skb, nlh);
2449
2450 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE_R, NULL, GFP_ATOMIC);
2451 return;
2452
2453nla_put_failure:
2454 nlmsg_cancel(skb, nlh);
2455errout:
2456 kfree_skb(skb);
2457 rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE_R, -ENOBUFS);
2458}
2459
d0440029
JK
2460static int ipmr_rtm_valid_getroute_req(struct sk_buff *skb,
2461 const struct nlmsghdr *nlh,
2462 struct nlattr **tb,
2463 struct netlink_ext_ack *extack)
2464{
2465 struct rtmsg *rtm;
2466 int i, err;
2467
2468 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
2469 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for multicast route get request");
2470 return -EINVAL;
2471 }
2472
2473 if (!netlink_strict_get_check(skb))
8cb08174
JB
2474 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
2475 rtm_ipv4_policy, extack);
d0440029
JK
2476
2477 rtm = nlmsg_data(nlh);
2478 if ((rtm->rtm_src_len && rtm->rtm_src_len != 32) ||
2479 (rtm->rtm_dst_len && rtm->rtm_dst_len != 32) ||
2480 rtm->rtm_tos || rtm->rtm_table || rtm->rtm_protocol ||
2481 rtm->rtm_scope || rtm->rtm_type || rtm->rtm_flags) {
2482 NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for multicast route get request");
2483 return -EINVAL;
2484 }
2485
8cb08174
JB
2486 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
2487 rtm_ipv4_policy, extack);
d0440029
JK
2488 if (err)
2489 return err;
2490
2491 if ((tb[RTA_SRC] && !rtm->rtm_src_len) ||
2492 (tb[RTA_DST] && !rtm->rtm_dst_len)) {
2493 NL_SET_ERR_MSG(extack, "ipv4: rtm_src_len and rtm_dst_len must be 32 for IPv4");
2494 return -EINVAL;
2495 }
2496
2497 for (i = 0; i <= RTA_MAX; i++) {
2498 if (!tb[i])
2499 continue;
2500
2501 switch (i) {
2502 case RTA_SRC:
2503 case RTA_DST:
2504 case RTA_TABLE:
2505 break;
2506 default:
2507 NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in multicast route get request");
2508 return -EINVAL;
2509 }
2510 }
2511
2512 return 0;
2513}
2514
4f75ba69
DS
2515static int ipmr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
2516 struct netlink_ext_ack *extack)
2517{
2518 struct net *net = sock_net(in_skb->sk);
2519 struct nlattr *tb[RTA_MAX + 1];
2520 struct sk_buff *skb = NULL;
2521 struct mfc_cache *cache;
2522 struct mr_table *mrt;
4f75ba69
DS
2523 __be32 src, grp;
2524 u32 tableid;
2525 int err;
2526
d0440029 2527 err = ipmr_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
4f75ba69
DS
2528 if (err < 0)
2529 goto errout;
2530
4f75ba69
DS
2531 src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0;
2532 grp = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0;
2533 tableid = tb[RTA_TABLE] ? nla_get_u32(tb[RTA_TABLE]) : 0;
2534
2535 mrt = ipmr_get_table(net, tableid ? tableid : RT_TABLE_DEFAULT);
2e3d232e
DC
2536 if (!mrt) {
2537 err = -ENOENT;
4f75ba69
DS
2538 goto errout_free;
2539 }
2540
2541 /* entries are added/deleted only under RTNL */
2542 rcu_read_lock();
2543 cache = ipmr_cache_find(mrt, src, grp);
2544 rcu_read_unlock();
2545 if (!cache) {
2546 err = -ENOENT;
2547 goto errout_free;
2548 }
2549
2550 skb = nlmsg_new(mroute_msgsize(false, mrt->maxvif), GFP_KERNEL);
2551 if (!skb) {
2552 err = -ENOBUFS;
2553 goto errout_free;
2554 }
2555
2556 err = ipmr_fill_mroute(mrt, skb, NETLINK_CB(in_skb).portid,
2557 nlh->nlmsg_seq, cache,
2558 RTM_NEWROUTE, 0);
2559 if (err < 0)
2560 goto errout_free;
2561
2562 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2563
2564errout:
2565 return err;
2566
2567errout_free:
2568 kfree_skb(skb);
2569 goto errout;
2570}
2571
cb6a4e46
PM
2572static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2573{
4724676d 2574 struct fib_dump_filter filter = {};
cb167893 2575 int err;
4724676d 2576
e8ba330a 2577 if (cb->strict_check) {
4724676d 2578 err = ip_valid_fib_dump_req(sock_net(skb->sk), cb->nlh,
effe6792 2579 &filter, cb);
e8ba330a
DA
2580 if (err < 0)
2581 return err;
2582 }
2583
cb167893
DA
2584 if (filter.table_id) {
2585 struct mr_table *mrt;
2586
2587 mrt = ipmr_get_table(sock_net(skb->sk), filter.table_id);
2588 if (!mrt) {
41b4bd98 2589 if (rtnl_msg_family(cb->nlh) != RTNL_FAMILY_IPMR)
ae677bbb
DA
2590 return skb->len;
2591
cb167893
DA
2592 NL_SET_ERR_MSG(cb->extack, "ipv4: MR table does not exist");
2593 return -ENOENT;
2594 }
2595 err = mr_table_dump(mrt, skb, cb, _ipmr_fill_mroute,
2596 &mfc_unres_lock, &filter);
2597 return skb->len ? : err;
2598 }
2599
7b0db857 2600 return mr_rtm_dumproute(skb, cb, ipmr_mr_table_iter,
cb167893 2601 _ipmr_fill_mroute, &mfc_unres_lock, &filter);
cb6a4e46
PM
2602}
2603
ccbb0aa6
NA
2604static const struct nla_policy rtm_ipmr_policy[RTA_MAX + 1] = {
2605 [RTA_SRC] = { .type = NLA_U32 },
2606 [RTA_DST] = { .type = NLA_U32 },
2607 [RTA_IIF] = { .type = NLA_U32 },
2608 [RTA_TABLE] = { .type = NLA_U32 },
2609 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2610};
2611
2612static bool ipmr_rtm_validate_proto(unsigned char rtm_protocol)
2613{
2614 switch (rtm_protocol) {
2615 case RTPROT_STATIC:
2616 case RTPROT_MROUTED:
2617 return true;
2618 }
2619 return false;
2620}
2621
2622static int ipmr_nla_get_ttls(const struct nlattr *nla, struct mfcctl *mfcc)
2623{
2624 struct rtnexthop *rtnh = nla_data(nla);
2625 int remaining = nla_len(nla), vifi = 0;
2626
2627 while (rtnh_ok(rtnh, remaining)) {
2628 mfcc->mfcc_ttls[vifi] = rtnh->rtnh_hops;
2629 if (++vifi == MAXVIFS)
2630 break;
2631 rtnh = rtnh_next(rtnh, &remaining);
2632 }
2633
2634 return remaining > 0 ? -EINVAL : vifi;
2635}
2636
2637/* returns < 0 on error, 0 for ADD_MFC and 1 for ADD_MFC_PROXY */
2638static int rtm_to_ipmr_mfcc(struct net *net, struct nlmsghdr *nlh,
2639 struct mfcctl *mfcc, int *mrtsock,
c21ef3e3
DA
2640 struct mr_table **mrtret,
2641 struct netlink_ext_ack *extack)
ccbb0aa6
NA
2642{
2643 struct net_device *dev = NULL;
2644 u32 tblid = RT_TABLE_DEFAULT;
2645 struct mr_table *mrt;
2646 struct nlattr *attr;
2647 struct rtmsg *rtm;
2648 int ret, rem;
2649
8cb08174
JB
2650 ret = nlmsg_validate_deprecated(nlh, sizeof(*rtm), RTA_MAX,
2651 rtm_ipmr_policy, extack);
ccbb0aa6
NA
2652 if (ret < 0)
2653 goto out;
2654 rtm = nlmsg_data(nlh);
2655
2656 ret = -EINVAL;
2657 if (rtm->rtm_family != RTNL_FAMILY_IPMR || rtm->rtm_dst_len != 32 ||
2658 rtm->rtm_type != RTN_MULTICAST ||
2659 rtm->rtm_scope != RT_SCOPE_UNIVERSE ||
2660 !ipmr_rtm_validate_proto(rtm->rtm_protocol))
2661 goto out;
2662
2663 memset(mfcc, 0, sizeof(*mfcc));
2664 mfcc->mfcc_parent = -1;
2665 ret = 0;
2666 nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), rem) {
2667 switch (nla_type(attr)) {
2668 case RTA_SRC:
2669 mfcc->mfcc_origin.s_addr = nla_get_be32(attr);
2670 break;
2671 case RTA_DST:
2672 mfcc->mfcc_mcastgrp.s_addr = nla_get_be32(attr);
2673 break;
2674 case RTA_IIF:
2675 dev = __dev_get_by_index(net, nla_get_u32(attr));
2676 if (!dev) {
2677 ret = -ENODEV;
2678 goto out;
2679 }
2680 break;
2681 case RTA_MULTIPATH:
2682 if (ipmr_nla_get_ttls(attr, mfcc) < 0) {
2683 ret = -EINVAL;
2684 goto out;
2685 }
2686 break;
2687 case RTA_PREFSRC:
2688 ret = 1;
2689 break;
2690 case RTA_TABLE:
2691 tblid = nla_get_u32(attr);
2692 break;
2693 }
2694 }
2695 mrt = ipmr_get_table(net, tblid);
2696 if (!mrt) {
2697 ret = -ENOENT;
2698 goto out;
2699 }
2700 *mrtret = mrt;
2701 *mrtsock = rtm->rtm_protocol == RTPROT_MROUTED ? 1 : 0;
2702 if (dev)
2703 mfcc->mfcc_parent = ipmr_find_vif(mrt, dev);
2704
2705out:
2706 return ret;
2707}
2708
2709/* takes care of both newroute and delroute */
c21ef3e3
DA
2710static int ipmr_rtm_route(struct sk_buff *skb, struct nlmsghdr *nlh,
2711 struct netlink_ext_ack *extack)
ccbb0aa6
NA
2712{
2713 struct net *net = sock_net(skb->sk);
2714 int ret, mrtsock, parent;
2715 struct mr_table *tbl;
2716 struct mfcctl mfcc;
2717
2718 mrtsock = 0;
2719 tbl = NULL;
c21ef3e3 2720 ret = rtm_to_ipmr_mfcc(net, nlh, &mfcc, &mrtsock, &tbl, extack);
ccbb0aa6
NA
2721 if (ret < 0)
2722 return ret;
2723
2724 parent = ret ? mfcc.mfcc_parent : -1;
2725 if (nlh->nlmsg_type == RTM_NEWROUTE)
2726 return ipmr_mfc_add(net, tbl, &mfcc, mrtsock, parent);
2727 else
2728 return ipmr_mfc_delete(tbl, &mfcc, parent);
2729}
2730
772c344d
NA
2731static bool ipmr_fill_table(struct mr_table *mrt, struct sk_buff *skb)
2732{
2733 u32 queue_len = atomic_read(&mrt->cache_resolve_queue_len);
2734
2735 if (nla_put_u32(skb, IPMRA_TABLE_ID, mrt->id) ||
2736 nla_put_u32(skb, IPMRA_TABLE_CACHE_RES_QUEUE_LEN, queue_len) ||
2737 nla_put_s32(skb, IPMRA_TABLE_MROUTE_REG_VIF_NUM,
2738 mrt->mroute_reg_vif_num) ||
2739 nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_ASSERT,
2740 mrt->mroute_do_assert) ||
c921c207
NA
2741 nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_PIM, mrt->mroute_do_pim) ||
2742 nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_WRVIFWHOLE,
2743 mrt->mroute_do_wrvifwhole))
772c344d
NA
2744 return false;
2745
2746 return true;
2747}
2748
2749static bool ipmr_fill_vif(struct mr_table *mrt, u32 vifid, struct sk_buff *skb)
2750{
2751 struct nlattr *vif_nest;
2752 struct vif_device *vif;
2753
2754 /* if the VIF doesn't exist just continue */
2755 if (!VIF_EXISTS(mrt, vifid))
2756 return true;
2757
2758 vif = &mrt->vif_table[vifid];
ae0be8de 2759 vif_nest = nla_nest_start_noflag(skb, IPMRA_VIF);
772c344d
NA
2760 if (!vif_nest)
2761 return false;
2762 if (nla_put_u32(skb, IPMRA_VIFA_IFINDEX, vif->dev->ifindex) ||
2763 nla_put_u32(skb, IPMRA_VIFA_VIF_ID, vifid) ||
2764 nla_put_u16(skb, IPMRA_VIFA_FLAGS, vif->flags) ||
2765 nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_IN, vif->bytes_in,
2766 IPMRA_VIFA_PAD) ||
2767 nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_OUT, vif->bytes_out,
2768 IPMRA_VIFA_PAD) ||
2769 nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_IN, vif->pkt_in,
2770 IPMRA_VIFA_PAD) ||
2771 nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_OUT, vif->pkt_out,
2772 IPMRA_VIFA_PAD) ||
2773 nla_put_be32(skb, IPMRA_VIFA_LOCAL_ADDR, vif->local) ||
2774 nla_put_be32(skb, IPMRA_VIFA_REMOTE_ADDR, vif->remote)) {
2775 nla_nest_cancel(skb, vif_nest);
2776 return false;
2777 }
2778 nla_nest_end(skb, vif_nest);
2779
2780 return true;
2781}
2782
14fc5bb2
DA
2783static int ipmr_valid_dumplink(const struct nlmsghdr *nlh,
2784 struct netlink_ext_ack *extack)
2785{
2786 struct ifinfomsg *ifm;
2787
2788 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
2789 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for ipmr link dump");
2790 return -EINVAL;
2791 }
2792
2793 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
2794 NL_SET_ERR_MSG(extack, "Invalid data after header in ipmr link dump");
2795 return -EINVAL;
2796 }
2797
2798 ifm = nlmsg_data(nlh);
2799 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
2800 ifm->ifi_change || ifm->ifi_index) {
2801 NL_SET_ERR_MSG(extack, "Invalid values in header for ipmr link dump request");
2802 return -EINVAL;
2803 }
2804
2805 return 0;
2806}
2807
772c344d
NA
2808static int ipmr_rtm_dumplink(struct sk_buff *skb, struct netlink_callback *cb)
2809{
2810 struct net *net = sock_net(skb->sk);
2811 struct nlmsghdr *nlh = NULL;
2812 unsigned int t = 0, s_t;
2813 unsigned int e = 0, s_e;
2814 struct mr_table *mrt;
2815
14fc5bb2
DA
2816 if (cb->strict_check) {
2817 int err = ipmr_valid_dumplink(cb->nlh, cb->extack);
2818
2819 if (err < 0)
2820 return err;
2821 }
2822
772c344d
NA
2823 s_t = cb->args[0];
2824 s_e = cb->args[1];
2825
2826 ipmr_for_each_table(mrt, net) {
2827 struct nlattr *vifs, *af;
2828 struct ifinfomsg *hdr;
2829 u32 i;
2830
2831 if (t < s_t)
2832 goto skip_table;
2833 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
2834 cb->nlh->nlmsg_seq, RTM_NEWLINK,
2835 sizeof(*hdr), NLM_F_MULTI);
2836 if (!nlh)
2837 break;
2838
2839 hdr = nlmsg_data(nlh);
2840 memset(hdr, 0, sizeof(*hdr));
2841 hdr->ifi_family = RTNL_FAMILY_IPMR;
2842
ae0be8de 2843 af = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
772c344d
NA
2844 if (!af) {
2845 nlmsg_cancel(skb, nlh);
2846 goto out;
2847 }
2848
2849 if (!ipmr_fill_table(mrt, skb)) {
2850 nlmsg_cancel(skb, nlh);
2851 goto out;
2852 }
2853
ae0be8de 2854 vifs = nla_nest_start_noflag(skb, IPMRA_TABLE_VIFS);
772c344d
NA
2855 if (!vifs) {
2856 nla_nest_end(skb, af);
2857 nlmsg_end(skb, nlh);
2858 goto out;
2859 }
2860 for (i = 0; i < mrt->maxvif; i++) {
2861 if (e < s_e)
2862 goto skip_entry;
2863 if (!ipmr_fill_vif(mrt, i, skb)) {
2864 nla_nest_end(skb, vifs);
2865 nla_nest_end(skb, af);
2866 nlmsg_end(skb, nlh);
2867 goto out;
2868 }
2869skip_entry:
2870 e++;
2871 }
2872 s_e = 0;
2873 e = 0;
2874 nla_nest_end(skb, vifs);
2875 nla_nest_end(skb, af);
2876 nlmsg_end(skb, nlh);
2877skip_table:
2878 t++;
2879 }
2880
2881out:
2882 cb->args[1] = e;
2883 cb->args[0] = t;
2884
2885 return skb->len;
2886}
2887
e905a9ed 2888#ifdef CONFIG_PROC_FS
7ef8f65d
NA
2889/* The /proc interfaces to multicast routing :
2890 * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif
1da177e4 2891 */
1da177e4
LT
2892
2893static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos)
ba93ef74 2894 __acquires(mrt_lock)
1da177e4 2895{
3feda6b4 2896 struct mr_vif_iter *iter = seq->private;
f6bb4514 2897 struct net *net = seq_file_net(seq);
f0ad0860
PM
2898 struct mr_table *mrt;
2899
2900 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
51456b29 2901 if (!mrt)
f0ad0860
PM
2902 return ERR_PTR(-ENOENT);
2903
2904 iter->mrt = mrt;
f6bb4514 2905
1da177e4 2906 read_lock(&mrt_lock);
3feda6b4 2907 return mr_vif_seq_start(seq, pos);
1da177e4
LT
2908}
2909
2910static void ipmr_vif_seq_stop(struct seq_file *seq, void *v)
ba93ef74 2911 __releases(mrt_lock)
1da177e4
LT
2912{
2913 read_unlock(&mrt_lock);
2914}
2915
2916static int ipmr_vif_seq_show(struct seq_file *seq, void *v)
2917{
3feda6b4 2918 struct mr_vif_iter *iter = seq->private;
f0ad0860 2919 struct mr_table *mrt = iter->mrt;
f6bb4514 2920
1da177e4 2921 if (v == SEQ_START_TOKEN) {
e905a9ed 2922 seq_puts(seq,
1da177e4
LT
2923 "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n");
2924 } else {
2925 const struct vif_device *vif = v;
6853f21f
YM
2926 const char *name = vif->dev ?
2927 vif->dev->name : "none";
1da177e4
LT
2928
2929 seq_printf(seq,
91e6dd82 2930 "%2td %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n",
0c12295a 2931 vif - mrt->vif_table,
e905a9ed 2932 name, vif->bytes_in, vif->pkt_in,
1da177e4
LT
2933 vif->bytes_out, vif->pkt_out,
2934 vif->flags, vif->local, vif->remote);
2935 }
2936 return 0;
2937}
2938
f690808e 2939static const struct seq_operations ipmr_vif_seq_ops = {
1da177e4 2940 .start = ipmr_vif_seq_start,
3feda6b4 2941 .next = mr_vif_seq_next,
1da177e4
LT
2942 .stop = ipmr_vif_seq_stop,
2943 .show = ipmr_vif_seq_show,
2944};
2945
1da177e4
LT
2946static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
2947{
f6bb4514 2948 struct net *net = seq_file_net(seq);
f0ad0860 2949 struct mr_table *mrt;
f6bb4514 2950
f0ad0860 2951 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
51456b29 2952 if (!mrt)
f0ad0860 2953 return ERR_PTR(-ENOENT);
f6bb4514 2954
c8d61968 2955 return mr_mfc_seq_start(seq, pos, mrt, &mfc_unres_lock);
1da177e4
LT
2956}
2957
2958static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
2959{
2960 int n;
2961
2962 if (v == SEQ_START_TOKEN) {
e905a9ed 2963 seq_puts(seq,
1da177e4
LT
2964 "Group Origin Iif Pkts Bytes Wrong Oifs\n");
2965 } else {
2966 const struct mfc_cache *mfc = v;
c8d61968 2967 const struct mr_mfc_iter *it = seq->private;
f0ad0860 2968 const struct mr_table *mrt = it->mrt;
e905a9ed 2969
0eae88f3
ED
2970 seq_printf(seq, "%08X %08X %-3hd",
2971 (__force u32) mfc->mfc_mcastgrp,
2972 (__force u32) mfc->mfc_origin,
494fff56 2973 mfc->_c.mfc_parent);
1da177e4 2974
0c12295a 2975 if (it->cache != &mrt->mfc_unres_queue) {
1ea472e2 2976 seq_printf(seq, " %8lu %8lu %8lu",
494fff56
YM
2977 mfc->_c.mfc_un.res.pkt,
2978 mfc->_c.mfc_un.res.bytes,
2979 mfc->_c.mfc_un.res.wrong_if);
2980 for (n = mfc->_c.mfc_un.res.minvif;
2981 n < mfc->_c.mfc_un.res.maxvif; n++) {
0c12295a 2982 if (VIF_EXISTS(mrt, n) &&
494fff56 2983 mfc->_c.mfc_un.res.ttls[n] < 255)
cf958ae3 2984 seq_printf(seq,
e905a9ed 2985 " %2d:%-3d",
494fff56 2986 n, mfc->_c.mfc_un.res.ttls[n]);
1da177e4 2987 }
1ea472e2
BT
2988 } else {
2989 /* unresolved mfc_caches don't contain
2990 * pkt, bytes and wrong_if values
2991 */
2992 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
1da177e4
LT
2993 }
2994 seq_putc(seq, '\n');
2995 }
2996 return 0;
2997}
2998
f690808e 2999static const struct seq_operations ipmr_mfc_seq_ops = {
1da177e4 3000 .start = ipmr_mfc_seq_start,
c8d61968
YM
3001 .next = mr_mfc_seq_next,
3002 .stop = mr_mfc_seq_stop,
1da177e4
LT
3003 .show = ipmr_mfc_seq_show,
3004};
e905a9ed 3005#endif
1da177e4
LT
3006
3007#ifdef CONFIG_IP_PIMSM_V2
32613090 3008static const struct net_protocol pim_protocol = {
1da177e4 3009 .handler = pim_rcv,
403dbb97 3010 .netns_ok = 1,
1da177e4
LT
3011};
3012#endif
3013
4d65b948
YG
3014static unsigned int ipmr_seq_read(struct net *net)
3015{
3016 ASSERT_RTNL();
3017
3018 return net->ipv4.ipmr_seq + ipmr_rules_seq_read(net);
3019}
3020
b7a59557
JP
3021static int ipmr_dump(struct net *net, struct notifier_block *nb,
3022 struct netlink_ext_ack *extack)
4d65b948 3023{
cdc9f944 3024 return mr_dump(net, nb, RTNL_FAMILY_IPMR, ipmr_rules_dump,
b7a59557 3025 ipmr_mr_table_iter, &mrt_lock, extack);
4d65b948
YG
3026}
3027
3028static const struct fib_notifier_ops ipmr_notifier_ops_template = {
3029 .family = RTNL_FAMILY_IPMR,
3030 .fib_seq_read = ipmr_seq_read,
3031 .fib_dump = ipmr_dump,
3032 .owner = THIS_MODULE,
3033};
3034
ef739d8a 3035static int __net_init ipmr_notifier_init(struct net *net)
4d65b948
YG
3036{
3037 struct fib_notifier_ops *ops;
3038
3039 net->ipv4.ipmr_seq = 0;
3040
3041 ops = fib_notifier_ops_register(&ipmr_notifier_ops_template, net);
3042 if (IS_ERR(ops))
3043 return PTR_ERR(ops);
3044 net->ipv4.ipmr_notifier_ops = ops;
3045
3046 return 0;
3047}
3048
3049static void __net_exit ipmr_notifier_exit(struct net *net)
3050{
3051 fib_notifier_ops_unregister(net->ipv4.ipmr_notifier_ops);
3052 net->ipv4.ipmr_notifier_ops = NULL;
3053}
3054
7ef8f65d 3055/* Setup for IP multicast routing */
cf958ae3
BT
3056static int __net_init ipmr_net_init(struct net *net)
3057{
f0ad0860 3058 int err;
cf958ae3 3059
4d65b948
YG
3060 err = ipmr_notifier_init(net);
3061 if (err)
3062 goto ipmr_notifier_fail;
3063
f0ad0860
PM
3064 err = ipmr_rules_init(net);
3065 if (err < 0)
4d65b948 3066 goto ipmr_rules_fail;
f6bb4514
BT
3067
3068#ifdef CONFIG_PROC_FS
3069 err = -ENOMEM;
c3506372
CH
3070 if (!proc_create_net("ip_mr_vif", 0, net->proc_net, &ipmr_vif_seq_ops,
3071 sizeof(struct mr_vif_iter)))
f6bb4514 3072 goto proc_vif_fail;
c3506372
CH
3073 if (!proc_create_net("ip_mr_cache", 0, net->proc_net, &ipmr_mfc_seq_ops,
3074 sizeof(struct mr_mfc_iter)))
f6bb4514
BT
3075 goto proc_cache_fail;
3076#endif
2bb8b26c
BT
3077 return 0;
3078
f6bb4514
BT
3079#ifdef CONFIG_PROC_FS
3080proc_cache_fail:
ece31ffd 3081 remove_proc_entry("ip_mr_vif", net->proc_net);
f6bb4514 3082proc_vif_fail:
f0ad0860 3083 ipmr_rules_exit(net);
f6bb4514 3084#endif
4d65b948
YG
3085ipmr_rules_fail:
3086 ipmr_notifier_exit(net);
3087ipmr_notifier_fail:
cf958ae3
BT
3088 return err;
3089}
3090
3091static void __net_exit ipmr_net_exit(struct net *net)
3092{
f6bb4514 3093#ifdef CONFIG_PROC_FS
ece31ffd
G
3094 remove_proc_entry("ip_mr_cache", net->proc_net);
3095 remove_proc_entry("ip_mr_vif", net->proc_net);
f6bb4514 3096#endif
4d65b948 3097 ipmr_notifier_exit(net);
f0ad0860 3098 ipmr_rules_exit(net);
cf958ae3
BT
3099}
3100
3101static struct pernet_operations ipmr_net_ops = {
3102 .init = ipmr_net_init,
3103 .exit = ipmr_net_exit,
3104};
e905a9ed 3105
03d2f897 3106int __init ip_mr_init(void)
1da177e4 3107{
03d2f897
WC
3108 int err;
3109
1da177e4
LT
3110 mrt_cachep = kmem_cache_create("ip_mrt_cache",
3111 sizeof(struct mfc_cache),
a8c9486b 3112 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC,
20c2df83 3113 NULL);
03d2f897 3114
cf958ae3
BT
3115 err = register_pernet_subsys(&ipmr_net_ops);
3116 if (err)
3117 goto reg_pernet_fail;
3118
03d2f897
WC
3119 err = register_netdevice_notifier(&ip_mr_notifier);
3120 if (err)
3121 goto reg_notif_fail;
403dbb97
TG
3122#ifdef CONFIG_IP_PIMSM_V2
3123 if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) {
058bd4d2 3124 pr_err("%s: can't add PIM protocol\n", __func__);
403dbb97
TG
3125 err = -EAGAIN;
3126 goto add_proto_fail;
3127 }
3128#endif
c7ac8679 3129 rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE,
b97bac64 3130 ipmr_rtm_getroute, ipmr_rtm_dumproute, 0);
ccbb0aa6 3131 rtnl_register(RTNL_FAMILY_IPMR, RTM_NEWROUTE,
b97bac64 3132 ipmr_rtm_route, NULL, 0);
ccbb0aa6 3133 rtnl_register(RTNL_FAMILY_IPMR, RTM_DELROUTE,
b97bac64 3134 ipmr_rtm_route, NULL, 0);
772c344d
NA
3135
3136 rtnl_register(RTNL_FAMILY_IPMR, RTM_GETLINK,
b97bac64 3137 NULL, ipmr_rtm_dumplink, 0);
03d2f897 3138 return 0;
f6bb4514 3139
403dbb97
TG
3140#ifdef CONFIG_IP_PIMSM_V2
3141add_proto_fail:
3142 unregister_netdevice_notifier(&ip_mr_notifier);
3143#endif
c3e38896 3144reg_notif_fail:
cf958ae3
BT
3145 unregister_pernet_subsys(&ipmr_net_ops);
3146reg_pernet_fail:
c3e38896 3147 kmem_cache_destroy(mrt_cachep);
03d2f897 3148 return err;
1da177e4 3149}