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[mirror_ubuntu-artful-kernel.git] / net / ipv4 / fib_frontend.c
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * IPv4 Forwarding Information Base: FIB frontend.
7 *
8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16 #include <linux/module.h>
17 #include <linux/uaccess.h>
18 #include <linux/bitops.h>
19 #include <linux/capability.h>
20 #include <linux/types.h>
21 #include <linux/kernel.h>
22 #include <linux/mm.h>
23 #include <linux/string.h>
24 #include <linux/socket.h>
25 #include <linux/sockios.h>
26 #include <linux/errno.h>
27 #include <linux/in.h>
28 #include <linux/inet.h>
29 #include <linux/inetdevice.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_addr.h>
32 #include <linux/if_arp.h>
33 #include <linux/skbuff.h>
34 #include <linux/cache.h>
35 #include <linux/init.h>
36 #include <linux/list.h>
37 #include <linux/slab.h>
38
39 #include <net/ip.h>
40 #include <net/protocol.h>
41 #include <net/route.h>
42 #include <net/tcp.h>
43 #include <net/sock.h>
44 #include <net/arp.h>
45 #include <net/ip_fib.h>
46 #include <net/rtnetlink.h>
47 #include <net/xfrm.h>
48 #include <net/l3mdev.h>
49 #include <net/lwtunnel.h>
50 #include <trace/events/fib.h>
51
52 #ifndef CONFIG_IP_MULTIPLE_TABLES
53
54 static int __net_init fib4_rules_init(struct net *net)
55 {
56 struct fib_table *local_table, *main_table;
57
58 main_table = fib_trie_table(RT_TABLE_MAIN, NULL);
59 if (!main_table)
60 return -ENOMEM;
61
62 local_table = fib_trie_table(RT_TABLE_LOCAL, main_table);
63 if (!local_table)
64 goto fail;
65
66 hlist_add_head_rcu(&local_table->tb_hlist,
67 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]);
68 hlist_add_head_rcu(&main_table->tb_hlist,
69 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]);
70 return 0;
71
72 fail:
73 fib_free_table(main_table);
74 return -ENOMEM;
75 }
76 #else
77
78 struct fib_table *fib_new_table(struct net *net, u32 id)
79 {
80 struct fib_table *tb, *alias = NULL;
81 unsigned int h;
82
83 if (id == 0)
84 id = RT_TABLE_MAIN;
85 tb = fib_get_table(net, id);
86 if (tb)
87 return tb;
88
89 if (id == RT_TABLE_LOCAL && !net->ipv4.fib_has_custom_rules)
90 alias = fib_new_table(net, RT_TABLE_MAIN);
91
92 tb = fib_trie_table(id, alias);
93 if (!tb)
94 return NULL;
95
96 switch (id) {
97 case RT_TABLE_MAIN:
98 rcu_assign_pointer(net->ipv4.fib_main, tb);
99 break;
100 case RT_TABLE_DEFAULT:
101 rcu_assign_pointer(net->ipv4.fib_default, tb);
102 break;
103 default:
104 break;
105 }
106
107 h = id & (FIB_TABLE_HASHSZ - 1);
108 hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]);
109 return tb;
110 }
111 EXPORT_SYMBOL_GPL(fib_new_table);
112
113 /* caller must hold either rtnl or rcu read lock */
114 struct fib_table *fib_get_table(struct net *net, u32 id)
115 {
116 struct fib_table *tb;
117 struct hlist_head *head;
118 unsigned int h;
119
120 if (id == 0)
121 id = RT_TABLE_MAIN;
122 h = id & (FIB_TABLE_HASHSZ - 1);
123
124 head = &net->ipv4.fib_table_hash[h];
125 hlist_for_each_entry_rcu(tb, head, tb_hlist) {
126 if (tb->tb_id == id)
127 return tb;
128 }
129 return NULL;
130 }
131 #endif /* CONFIG_IP_MULTIPLE_TABLES */
132
133 static void fib_replace_table(struct net *net, struct fib_table *old,
134 struct fib_table *new)
135 {
136 #ifdef CONFIG_IP_MULTIPLE_TABLES
137 switch (new->tb_id) {
138 case RT_TABLE_MAIN:
139 rcu_assign_pointer(net->ipv4.fib_main, new);
140 break;
141 case RT_TABLE_DEFAULT:
142 rcu_assign_pointer(net->ipv4.fib_default, new);
143 break;
144 default:
145 break;
146 }
147
148 #endif
149 /* replace the old table in the hlist */
150 hlist_replace_rcu(&old->tb_hlist, &new->tb_hlist);
151 }
152
153 int fib_unmerge(struct net *net)
154 {
155 struct fib_table *old, *new, *main_table;
156
157 /* attempt to fetch local table if it has been allocated */
158 old = fib_get_table(net, RT_TABLE_LOCAL);
159 if (!old)
160 return 0;
161
162 new = fib_trie_unmerge(old);
163 if (!new)
164 return -ENOMEM;
165
166 /* table is already unmerged */
167 if (new == old)
168 return 0;
169
170 /* replace merged table with clean table */
171 fib_replace_table(net, old, new);
172 fib_free_table(old);
173
174 /* attempt to fetch main table if it has been allocated */
175 main_table = fib_get_table(net, RT_TABLE_MAIN);
176 if (!main_table)
177 return 0;
178
179 /* flush local entries from main table */
180 fib_table_flush_external(main_table);
181
182 return 0;
183 }
184
185 static void fib_flush(struct net *net)
186 {
187 int flushed = 0;
188 unsigned int h;
189
190 for (h = 0; h < FIB_TABLE_HASHSZ; h++) {
191 struct hlist_head *head = &net->ipv4.fib_table_hash[h];
192 struct hlist_node *tmp;
193 struct fib_table *tb;
194
195 hlist_for_each_entry_safe(tb, tmp, head, tb_hlist)
196 flushed += fib_table_flush(net, tb);
197 }
198
199 if (flushed)
200 rt_cache_flush(net);
201 }
202
203 /*
204 * Find address type as if only "dev" was present in the system. If
205 * on_dev is NULL then all interfaces are taken into consideration.
206 */
207 static inline unsigned int __inet_dev_addr_type(struct net *net,
208 const struct net_device *dev,
209 __be32 addr, u32 tb_id)
210 {
211 struct flowi4 fl4 = { .daddr = addr };
212 struct fib_result res;
213 unsigned int ret = RTN_BROADCAST;
214 struct fib_table *table;
215
216 if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr))
217 return RTN_BROADCAST;
218 if (ipv4_is_multicast(addr))
219 return RTN_MULTICAST;
220
221 rcu_read_lock();
222
223 table = fib_get_table(net, tb_id);
224 if (table) {
225 ret = RTN_UNICAST;
226 if (!fib_table_lookup(table, &fl4, &res, FIB_LOOKUP_NOREF)) {
227 if (!dev || dev == res.fi->fib_dev)
228 ret = res.type;
229 }
230 }
231
232 rcu_read_unlock();
233 return ret;
234 }
235
236 unsigned int inet_addr_type_table(struct net *net, __be32 addr, u32 tb_id)
237 {
238 return __inet_dev_addr_type(net, NULL, addr, tb_id);
239 }
240 EXPORT_SYMBOL(inet_addr_type_table);
241
242 unsigned int inet_addr_type(struct net *net, __be32 addr)
243 {
244 return __inet_dev_addr_type(net, NULL, addr, RT_TABLE_LOCAL);
245 }
246 EXPORT_SYMBOL(inet_addr_type);
247
248 unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev,
249 __be32 addr)
250 {
251 u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL;
252
253 return __inet_dev_addr_type(net, dev, addr, rt_table);
254 }
255 EXPORT_SYMBOL(inet_dev_addr_type);
256
257 /* inet_addr_type with dev == NULL but using the table from a dev
258 * if one is associated
259 */
260 unsigned int inet_addr_type_dev_table(struct net *net,
261 const struct net_device *dev,
262 __be32 addr)
263 {
264 u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL;
265
266 return __inet_dev_addr_type(net, NULL, addr, rt_table);
267 }
268 EXPORT_SYMBOL(inet_addr_type_dev_table);
269
270 __be32 fib_compute_spec_dst(struct sk_buff *skb)
271 {
272 struct net_device *dev = skb->dev;
273 struct in_device *in_dev;
274 struct fib_result res;
275 struct rtable *rt;
276 struct net *net;
277 int scope;
278
279 rt = skb_rtable(skb);
280 if ((rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | RTCF_LOCAL)) ==
281 RTCF_LOCAL)
282 return ip_hdr(skb)->daddr;
283
284 in_dev = __in_dev_get_rcu(dev);
285 BUG_ON(!in_dev);
286
287 net = dev_net(dev);
288
289 scope = RT_SCOPE_UNIVERSE;
290 if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) {
291 struct flowi4 fl4 = {
292 .flowi4_iif = LOOPBACK_IFINDEX,
293 .daddr = ip_hdr(skb)->saddr,
294 .flowi4_tos = RT_TOS(ip_hdr(skb)->tos),
295 .flowi4_scope = scope,
296 .flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0,
297 };
298 if (!fib_lookup(net, &fl4, &res, 0))
299 return FIB_RES_PREFSRC(net, res);
300 } else {
301 scope = RT_SCOPE_LINK;
302 }
303
304 return inet_select_addr(dev, ip_hdr(skb)->saddr, scope);
305 }
306
307 /* Given (packet source, input interface) and optional (dst, oif, tos):
308 * - (main) check, that source is valid i.e. not broadcast or our local
309 * address.
310 * - figure out what "logical" interface this packet arrived
311 * and calculate "specific destination" address.
312 * - check, that packet arrived from expected physical interface.
313 * called with rcu_read_lock()
314 */
315 static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
316 u8 tos, int oif, struct net_device *dev,
317 int rpf, struct in_device *idev, u32 *itag)
318 {
319 int ret, no_addr;
320 struct fib_result res;
321 struct flowi4 fl4;
322 struct net *net = dev_net(dev);
323 bool dev_match;
324
325 fl4.flowi4_oif = 0;
326 fl4.flowi4_iif = l3mdev_master_ifindex_rcu(dev);
327 if (!fl4.flowi4_iif)
328 fl4.flowi4_iif = oif ? : LOOPBACK_IFINDEX;
329 fl4.daddr = src;
330 fl4.saddr = dst;
331 fl4.flowi4_tos = tos;
332 fl4.flowi4_scope = RT_SCOPE_UNIVERSE;
333 fl4.flowi4_tun_key.tun_id = 0;
334 fl4.flowi4_flags = 0;
335 fl4.flowi4_uid = sock_net_uid(net, NULL);
336
337 no_addr = idev->ifa_list == NULL;
338
339 fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0;
340
341 trace_fib_validate_source(dev, &fl4);
342
343 if (fib_lookup(net, &fl4, &res, 0))
344 goto last_resort;
345 if (res.type != RTN_UNICAST &&
346 (res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev)))
347 goto e_inval;
348 if (!rpf && !fib_num_tclassid_users(net) &&
349 (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev)))
350 goto last_resort;
351 fib_combine_itag(itag, &res);
352 dev_match = false;
353
354 #ifdef CONFIG_IP_ROUTE_MULTIPATH
355 for (ret = 0; ret < res.fi->fib_nhs; ret++) {
356 struct fib_nh *nh = &res.fi->fib_nh[ret];
357
358 if (nh->nh_dev == dev) {
359 dev_match = true;
360 break;
361 } else if (l3mdev_master_ifindex_rcu(nh->nh_dev) == dev->ifindex) {
362 dev_match = true;
363 break;
364 }
365 }
366 #else
367 if (FIB_RES_DEV(res) == dev)
368 dev_match = true;
369 #endif
370 if (dev_match) {
371 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
372 return ret;
373 }
374 if (no_addr)
375 goto last_resort;
376 if (rpf == 1)
377 goto e_rpf;
378 fl4.flowi4_oif = dev->ifindex;
379
380 ret = 0;
381 if (fib_lookup(net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE) == 0) {
382 if (res.type == RTN_UNICAST)
383 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
384 }
385 return ret;
386
387 last_resort:
388 if (rpf)
389 goto e_rpf;
390 *itag = 0;
391 return 0;
392
393 e_inval:
394 return -EINVAL;
395 e_rpf:
396 return -EXDEV;
397 }
398
399 /* Ignore rp_filter for packets protected by IPsec. */
400 int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
401 u8 tos, int oif, struct net_device *dev,
402 struct in_device *idev, u32 *itag)
403 {
404 int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev);
405
406 if (!r && !fib_num_tclassid_users(dev_net(dev)) &&
407 IN_DEV_ACCEPT_LOCAL(idev) &&
408 (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) {
409 *itag = 0;
410 return 0;
411 }
412 return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag);
413 }
414
415 static inline __be32 sk_extract_addr(struct sockaddr *addr)
416 {
417 return ((struct sockaddr_in *) addr)->sin_addr.s_addr;
418 }
419
420 static int put_rtax(struct nlattr *mx, int len, int type, u32 value)
421 {
422 struct nlattr *nla;
423
424 nla = (struct nlattr *) ((char *) mx + len);
425 nla->nla_type = type;
426 nla->nla_len = nla_attr_size(4);
427 *(u32 *) nla_data(nla) = value;
428
429 return len + nla_total_size(4);
430 }
431
432 static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt,
433 struct fib_config *cfg)
434 {
435 __be32 addr;
436 int plen;
437
438 memset(cfg, 0, sizeof(*cfg));
439 cfg->fc_nlinfo.nl_net = net;
440
441 if (rt->rt_dst.sa_family != AF_INET)
442 return -EAFNOSUPPORT;
443
444 /*
445 * Check mask for validity:
446 * a) it must be contiguous.
447 * b) destination must have all host bits clear.
448 * c) if application forgot to set correct family (AF_INET),
449 * reject request unless it is absolutely clear i.e.
450 * both family and mask are zero.
451 */
452 plen = 32;
453 addr = sk_extract_addr(&rt->rt_dst);
454 if (!(rt->rt_flags & RTF_HOST)) {
455 __be32 mask = sk_extract_addr(&rt->rt_genmask);
456
457 if (rt->rt_genmask.sa_family != AF_INET) {
458 if (mask || rt->rt_genmask.sa_family)
459 return -EAFNOSUPPORT;
460 }
461
462 if (bad_mask(mask, addr))
463 return -EINVAL;
464
465 plen = inet_mask_len(mask);
466 }
467
468 cfg->fc_dst_len = plen;
469 cfg->fc_dst = addr;
470
471 if (cmd != SIOCDELRT) {
472 cfg->fc_nlflags = NLM_F_CREATE;
473 cfg->fc_protocol = RTPROT_BOOT;
474 }
475
476 if (rt->rt_metric)
477 cfg->fc_priority = rt->rt_metric - 1;
478
479 if (rt->rt_flags & RTF_REJECT) {
480 cfg->fc_scope = RT_SCOPE_HOST;
481 cfg->fc_type = RTN_UNREACHABLE;
482 return 0;
483 }
484
485 cfg->fc_scope = RT_SCOPE_NOWHERE;
486 cfg->fc_type = RTN_UNICAST;
487
488 if (rt->rt_dev) {
489 char *colon;
490 struct net_device *dev;
491 char devname[IFNAMSIZ];
492
493 if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1))
494 return -EFAULT;
495
496 devname[IFNAMSIZ-1] = 0;
497 colon = strchr(devname, ':');
498 if (colon)
499 *colon = 0;
500 dev = __dev_get_by_name(net, devname);
501 if (!dev)
502 return -ENODEV;
503 cfg->fc_oif = dev->ifindex;
504 cfg->fc_table = l3mdev_fib_table(dev);
505 if (colon) {
506 struct in_ifaddr *ifa;
507 struct in_device *in_dev = __in_dev_get_rtnl(dev);
508 if (!in_dev)
509 return -ENODEV;
510 *colon = ':';
511 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next)
512 if (strcmp(ifa->ifa_label, devname) == 0)
513 break;
514 if (!ifa)
515 return -ENODEV;
516 cfg->fc_prefsrc = ifa->ifa_local;
517 }
518 }
519
520 addr = sk_extract_addr(&rt->rt_gateway);
521 if (rt->rt_gateway.sa_family == AF_INET && addr) {
522 unsigned int addr_type;
523
524 cfg->fc_gw = addr;
525 addr_type = inet_addr_type_table(net, addr, cfg->fc_table);
526 if (rt->rt_flags & RTF_GATEWAY &&
527 addr_type == RTN_UNICAST)
528 cfg->fc_scope = RT_SCOPE_UNIVERSE;
529 }
530
531 if (cmd == SIOCDELRT)
532 return 0;
533
534 if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw)
535 return -EINVAL;
536
537 if (cfg->fc_scope == RT_SCOPE_NOWHERE)
538 cfg->fc_scope = RT_SCOPE_LINK;
539
540 if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) {
541 struct nlattr *mx;
542 int len = 0;
543
544 mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL);
545 if (!mx)
546 return -ENOMEM;
547
548 if (rt->rt_flags & RTF_MTU)
549 len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40);
550
551 if (rt->rt_flags & RTF_WINDOW)
552 len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window);
553
554 if (rt->rt_flags & RTF_IRTT)
555 len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3);
556
557 cfg->fc_mx = mx;
558 cfg->fc_mx_len = len;
559 }
560
561 return 0;
562 }
563
564 /*
565 * Handle IP routing ioctl calls.
566 * These are used to manipulate the routing tables
567 */
568 int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg)
569 {
570 struct fib_config cfg;
571 struct rtentry rt;
572 int err;
573
574 switch (cmd) {
575 case SIOCADDRT: /* Add a route */
576 case SIOCDELRT: /* Delete a route */
577 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
578 return -EPERM;
579
580 if (copy_from_user(&rt, arg, sizeof(rt)))
581 return -EFAULT;
582
583 rtnl_lock();
584 err = rtentry_to_fib_config(net, cmd, &rt, &cfg);
585 if (err == 0) {
586 struct fib_table *tb;
587
588 if (cmd == SIOCDELRT) {
589 tb = fib_get_table(net, cfg.fc_table);
590 if (tb)
591 err = fib_table_delete(net, tb, &cfg,
592 NULL);
593 else
594 err = -ESRCH;
595 } else {
596 tb = fib_new_table(net, cfg.fc_table);
597 if (tb)
598 err = fib_table_insert(net, tb,
599 &cfg, NULL);
600 else
601 err = -ENOBUFS;
602 }
603
604 /* allocated by rtentry_to_fib_config() */
605 kfree(cfg.fc_mx);
606 }
607 rtnl_unlock();
608 return err;
609 }
610 return -EINVAL;
611 }
612
613 const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = {
614 [RTA_DST] = { .type = NLA_U32 },
615 [RTA_SRC] = { .type = NLA_U32 },
616 [RTA_IIF] = { .type = NLA_U32 },
617 [RTA_OIF] = { .type = NLA_U32 },
618 [RTA_GATEWAY] = { .type = NLA_U32 },
619 [RTA_PRIORITY] = { .type = NLA_U32 },
620 [RTA_PREFSRC] = { .type = NLA_U32 },
621 [RTA_METRICS] = { .type = NLA_NESTED },
622 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
623 [RTA_FLOW] = { .type = NLA_U32 },
624 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
625 [RTA_ENCAP] = { .type = NLA_NESTED },
626 [RTA_UID] = { .type = NLA_U32 },
627 [RTA_MARK] = { .type = NLA_U32 },
628 };
629
630 static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
631 struct nlmsghdr *nlh, struct fib_config *cfg,
632 struct netlink_ext_ack *extack)
633 {
634 struct nlattr *attr;
635 int err, remaining;
636 struct rtmsg *rtm;
637
638 err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy,
639 extack);
640 if (err < 0)
641 goto errout;
642
643 memset(cfg, 0, sizeof(*cfg));
644
645 rtm = nlmsg_data(nlh);
646 cfg->fc_dst_len = rtm->rtm_dst_len;
647 cfg->fc_tos = rtm->rtm_tos;
648 cfg->fc_table = rtm->rtm_table;
649 cfg->fc_protocol = rtm->rtm_protocol;
650 cfg->fc_scope = rtm->rtm_scope;
651 cfg->fc_type = rtm->rtm_type;
652 cfg->fc_flags = rtm->rtm_flags;
653 cfg->fc_nlflags = nlh->nlmsg_flags;
654
655 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
656 cfg->fc_nlinfo.nlh = nlh;
657 cfg->fc_nlinfo.nl_net = net;
658
659 if (cfg->fc_type > RTN_MAX) {
660 NL_SET_ERR_MSG(extack, "Invalid route type");
661 err = -EINVAL;
662 goto errout;
663 }
664
665 nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) {
666 switch (nla_type(attr)) {
667 case RTA_DST:
668 cfg->fc_dst = nla_get_be32(attr);
669 break;
670 case RTA_OIF:
671 cfg->fc_oif = nla_get_u32(attr);
672 break;
673 case RTA_GATEWAY:
674 cfg->fc_gw = nla_get_be32(attr);
675 break;
676 case RTA_PRIORITY:
677 cfg->fc_priority = nla_get_u32(attr);
678 break;
679 case RTA_PREFSRC:
680 cfg->fc_prefsrc = nla_get_be32(attr);
681 break;
682 case RTA_METRICS:
683 cfg->fc_mx = nla_data(attr);
684 cfg->fc_mx_len = nla_len(attr);
685 break;
686 case RTA_MULTIPATH:
687 err = lwtunnel_valid_encap_type_attr(nla_data(attr),
688 nla_len(attr),
689 extack);
690 if (err < 0)
691 goto errout;
692 cfg->fc_mp = nla_data(attr);
693 cfg->fc_mp_len = nla_len(attr);
694 break;
695 case RTA_FLOW:
696 cfg->fc_flow = nla_get_u32(attr);
697 break;
698 case RTA_TABLE:
699 cfg->fc_table = nla_get_u32(attr);
700 break;
701 case RTA_ENCAP:
702 cfg->fc_encap = attr;
703 break;
704 case RTA_ENCAP_TYPE:
705 cfg->fc_encap_type = nla_get_u16(attr);
706 err = lwtunnel_valid_encap_type(cfg->fc_encap_type,
707 extack);
708 if (err < 0)
709 goto errout;
710 break;
711 }
712 }
713
714 return 0;
715 errout:
716 return err;
717 }
718
719 static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
720 struct netlink_ext_ack *extack)
721 {
722 struct net *net = sock_net(skb->sk);
723 struct fib_config cfg;
724 struct fib_table *tb;
725 int err;
726
727 err = rtm_to_fib_config(net, skb, nlh, &cfg, extack);
728 if (err < 0)
729 goto errout;
730
731 tb = fib_get_table(net, cfg.fc_table);
732 if (!tb) {
733 NL_SET_ERR_MSG(extack, "FIB table does not exist");
734 err = -ESRCH;
735 goto errout;
736 }
737
738 err = fib_table_delete(net, tb, &cfg, extack);
739 errout:
740 return err;
741 }
742
743 static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
744 struct netlink_ext_ack *extack)
745 {
746 struct net *net = sock_net(skb->sk);
747 struct fib_config cfg;
748 struct fib_table *tb;
749 int err;
750
751 err = rtm_to_fib_config(net, skb, nlh, &cfg, extack);
752 if (err < 0)
753 goto errout;
754
755 tb = fib_new_table(net, cfg.fc_table);
756 if (!tb) {
757 err = -ENOBUFS;
758 goto errout;
759 }
760
761 err = fib_table_insert(net, tb, &cfg, extack);
762 errout:
763 return err;
764 }
765
766 static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
767 {
768 struct net *net = sock_net(skb->sk);
769 unsigned int h, s_h;
770 unsigned int e = 0, s_e;
771 struct fib_table *tb;
772 struct hlist_head *head;
773 int dumped = 0, err;
774
775 if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) &&
776 ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED)
777 return skb->len;
778
779 s_h = cb->args[0];
780 s_e = cb->args[1];
781
782 rcu_read_lock();
783
784 for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) {
785 e = 0;
786 head = &net->ipv4.fib_table_hash[h];
787 hlist_for_each_entry_rcu(tb, head, tb_hlist) {
788 if (e < s_e)
789 goto next;
790 if (dumped)
791 memset(&cb->args[2], 0, sizeof(cb->args) -
792 2 * sizeof(cb->args[0]));
793 err = fib_table_dump(tb, skb, cb);
794 if (err < 0) {
795 if (likely(skb->len))
796 goto out;
797
798 goto out_err;
799 }
800 dumped = 1;
801 next:
802 e++;
803 }
804 }
805 out:
806 err = skb->len;
807 out_err:
808 rcu_read_unlock();
809
810 cb->args[1] = e;
811 cb->args[0] = h;
812
813 return err;
814 }
815
816 /* Prepare and feed intra-kernel routing request.
817 * Really, it should be netlink message, but :-( netlink
818 * can be not configured, so that we feed it directly
819 * to fib engine. It is legal, because all events occur
820 * only when netlink is already locked.
821 */
822 static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa)
823 {
824 struct net *net = dev_net(ifa->ifa_dev->dev);
825 u32 tb_id = l3mdev_fib_table(ifa->ifa_dev->dev);
826 struct fib_table *tb;
827 struct fib_config cfg = {
828 .fc_protocol = RTPROT_KERNEL,
829 .fc_type = type,
830 .fc_dst = dst,
831 .fc_dst_len = dst_len,
832 .fc_prefsrc = ifa->ifa_local,
833 .fc_oif = ifa->ifa_dev->dev->ifindex,
834 .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND,
835 .fc_nlinfo = {
836 .nl_net = net,
837 },
838 };
839
840 if (!tb_id)
841 tb_id = (type == RTN_UNICAST) ? RT_TABLE_MAIN : RT_TABLE_LOCAL;
842
843 tb = fib_new_table(net, tb_id);
844 if (!tb)
845 return;
846
847 cfg.fc_table = tb->tb_id;
848
849 if (type != RTN_LOCAL)
850 cfg.fc_scope = RT_SCOPE_LINK;
851 else
852 cfg.fc_scope = RT_SCOPE_HOST;
853
854 if (cmd == RTM_NEWROUTE)
855 fib_table_insert(net, tb, &cfg, NULL);
856 else
857 fib_table_delete(net, tb, &cfg, NULL);
858 }
859
860 void fib_add_ifaddr(struct in_ifaddr *ifa)
861 {
862 struct in_device *in_dev = ifa->ifa_dev;
863 struct net_device *dev = in_dev->dev;
864 struct in_ifaddr *prim = ifa;
865 __be32 mask = ifa->ifa_mask;
866 __be32 addr = ifa->ifa_local;
867 __be32 prefix = ifa->ifa_address & mask;
868
869 if (ifa->ifa_flags & IFA_F_SECONDARY) {
870 prim = inet_ifa_byprefix(in_dev, prefix, mask);
871 if (!prim) {
872 pr_warn("%s: bug: prim == NULL\n", __func__);
873 return;
874 }
875 }
876
877 fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim);
878
879 if (!(dev->flags & IFF_UP))
880 return;
881
882 /* Add broadcast address, if it is explicitly assigned. */
883 if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF))
884 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
885
886 if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) &&
887 (prefix != addr || ifa->ifa_prefixlen < 32)) {
888 if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE))
889 fib_magic(RTM_NEWROUTE,
890 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
891 prefix, ifa->ifa_prefixlen, prim);
892
893 /* Add network specific broadcasts, when it takes a sense */
894 if (ifa->ifa_prefixlen < 31) {
895 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim);
896 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask,
897 32, prim);
898 }
899 }
900 }
901
902 /* Delete primary or secondary address.
903 * Optionally, on secondary address promotion consider the addresses
904 * from subnet iprim as deleted, even if they are in device list.
905 * In this case the secondary ifa can be in device list.
906 */
907 void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim)
908 {
909 struct in_device *in_dev = ifa->ifa_dev;
910 struct net_device *dev = in_dev->dev;
911 struct in_ifaddr *ifa1;
912 struct in_ifaddr *prim = ifa, *prim1 = NULL;
913 __be32 brd = ifa->ifa_address | ~ifa->ifa_mask;
914 __be32 any = ifa->ifa_address & ifa->ifa_mask;
915 #define LOCAL_OK 1
916 #define BRD_OK 2
917 #define BRD0_OK 4
918 #define BRD1_OK 8
919 unsigned int ok = 0;
920 int subnet = 0; /* Primary network */
921 int gone = 1; /* Address is missing */
922 int same_prefsrc = 0; /* Another primary with same IP */
923
924 if (ifa->ifa_flags & IFA_F_SECONDARY) {
925 prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask);
926 if (!prim) {
927 /* if the device has been deleted, we don't perform
928 * address promotion
929 */
930 if (!in_dev->dead)
931 pr_warn("%s: bug: prim == NULL\n", __func__);
932 return;
933 }
934 if (iprim && iprim != prim) {
935 pr_warn("%s: bug: iprim != prim\n", __func__);
936 return;
937 }
938 } else if (!ipv4_is_zeronet(any) &&
939 (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) {
940 if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE))
941 fib_magic(RTM_DELROUTE,
942 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
943 any, ifa->ifa_prefixlen, prim);
944 subnet = 1;
945 }
946
947 if (in_dev->dead)
948 goto no_promotions;
949
950 /* Deletion is more complicated than add.
951 * We should take care of not to delete too much :-)
952 *
953 * Scan address list to be sure that addresses are really gone.
954 */
955
956 for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
957 if (ifa1 == ifa) {
958 /* promotion, keep the IP */
959 gone = 0;
960 continue;
961 }
962 /* Ignore IFAs from our subnet */
963 if (iprim && ifa1->ifa_mask == iprim->ifa_mask &&
964 inet_ifa_match(ifa1->ifa_address, iprim))
965 continue;
966
967 /* Ignore ifa1 if it uses different primary IP (prefsrc) */
968 if (ifa1->ifa_flags & IFA_F_SECONDARY) {
969 /* Another address from our subnet? */
970 if (ifa1->ifa_mask == prim->ifa_mask &&
971 inet_ifa_match(ifa1->ifa_address, prim))
972 prim1 = prim;
973 else {
974 /* We reached the secondaries, so
975 * same_prefsrc should be determined.
976 */
977 if (!same_prefsrc)
978 continue;
979 /* Search new prim1 if ifa1 is not
980 * using the current prim1
981 */
982 if (!prim1 ||
983 ifa1->ifa_mask != prim1->ifa_mask ||
984 !inet_ifa_match(ifa1->ifa_address, prim1))
985 prim1 = inet_ifa_byprefix(in_dev,
986 ifa1->ifa_address,
987 ifa1->ifa_mask);
988 if (!prim1)
989 continue;
990 if (prim1->ifa_local != prim->ifa_local)
991 continue;
992 }
993 } else {
994 if (prim->ifa_local != ifa1->ifa_local)
995 continue;
996 prim1 = ifa1;
997 if (prim != prim1)
998 same_prefsrc = 1;
999 }
1000 if (ifa->ifa_local == ifa1->ifa_local)
1001 ok |= LOCAL_OK;
1002 if (ifa->ifa_broadcast == ifa1->ifa_broadcast)
1003 ok |= BRD_OK;
1004 if (brd == ifa1->ifa_broadcast)
1005 ok |= BRD1_OK;
1006 if (any == ifa1->ifa_broadcast)
1007 ok |= BRD0_OK;
1008 /* primary has network specific broadcasts */
1009 if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) {
1010 __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask;
1011 __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask;
1012
1013 if (!ipv4_is_zeronet(any1)) {
1014 if (ifa->ifa_broadcast == brd1 ||
1015 ifa->ifa_broadcast == any1)
1016 ok |= BRD_OK;
1017 if (brd == brd1 || brd == any1)
1018 ok |= BRD1_OK;
1019 if (any == brd1 || any == any1)
1020 ok |= BRD0_OK;
1021 }
1022 }
1023 }
1024
1025 no_promotions:
1026 if (!(ok & BRD_OK))
1027 fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
1028 if (subnet && ifa->ifa_prefixlen < 31) {
1029 if (!(ok & BRD1_OK))
1030 fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim);
1031 if (!(ok & BRD0_OK))
1032 fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim);
1033 }
1034 if (!(ok & LOCAL_OK)) {
1035 unsigned int addr_type;
1036
1037 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim);
1038
1039 /* Check, that this local address finally disappeared. */
1040 addr_type = inet_addr_type_dev_table(dev_net(dev), dev,
1041 ifa->ifa_local);
1042 if (gone && addr_type != RTN_LOCAL) {
1043 /* And the last, but not the least thing.
1044 * We must flush stray FIB entries.
1045 *
1046 * First of all, we scan fib_info list searching
1047 * for stray nexthop entries, then ignite fib_flush.
1048 */
1049 if (fib_sync_down_addr(dev, ifa->ifa_local))
1050 fib_flush(dev_net(dev));
1051 }
1052 }
1053 #undef LOCAL_OK
1054 #undef BRD_OK
1055 #undef BRD0_OK
1056 #undef BRD1_OK
1057 }
1058
1059 static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn)
1060 {
1061
1062 struct fib_result res;
1063 struct flowi4 fl4 = {
1064 .flowi4_mark = frn->fl_mark,
1065 .daddr = frn->fl_addr,
1066 .flowi4_tos = frn->fl_tos,
1067 .flowi4_scope = frn->fl_scope,
1068 };
1069 struct fib_table *tb;
1070
1071 rcu_read_lock();
1072
1073 tb = fib_get_table(net, frn->tb_id_in);
1074
1075 frn->err = -ENOENT;
1076 if (tb) {
1077 local_bh_disable();
1078
1079 frn->tb_id = tb->tb_id;
1080 frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF);
1081
1082 if (!frn->err) {
1083 frn->prefixlen = res.prefixlen;
1084 frn->nh_sel = res.nh_sel;
1085 frn->type = res.type;
1086 frn->scope = res.scope;
1087 }
1088 local_bh_enable();
1089 }
1090
1091 rcu_read_unlock();
1092 }
1093
1094 static void nl_fib_input(struct sk_buff *skb)
1095 {
1096 struct net *net;
1097 struct fib_result_nl *frn;
1098 struct nlmsghdr *nlh;
1099 u32 portid;
1100
1101 net = sock_net(skb->sk);
1102 nlh = nlmsg_hdr(skb);
1103 if (skb->len < nlmsg_total_size(sizeof(*frn)) ||
1104 skb->len < nlh->nlmsg_len ||
1105 nlmsg_len(nlh) < sizeof(*frn))
1106 return;
1107
1108 skb = netlink_skb_clone(skb, GFP_KERNEL);
1109 if (!skb)
1110 return;
1111 nlh = nlmsg_hdr(skb);
1112
1113 frn = (struct fib_result_nl *) nlmsg_data(nlh);
1114 nl_fib_lookup(net, frn);
1115
1116 portid = NETLINK_CB(skb).portid; /* netlink portid */
1117 NETLINK_CB(skb).portid = 0; /* from kernel */
1118 NETLINK_CB(skb).dst_group = 0; /* unicast */
1119 netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT);
1120 }
1121
1122 static int __net_init nl_fib_lookup_init(struct net *net)
1123 {
1124 struct sock *sk;
1125 struct netlink_kernel_cfg cfg = {
1126 .input = nl_fib_input,
1127 };
1128
1129 sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg);
1130 if (!sk)
1131 return -EAFNOSUPPORT;
1132 net->ipv4.fibnl = sk;
1133 return 0;
1134 }
1135
1136 static void nl_fib_lookup_exit(struct net *net)
1137 {
1138 netlink_kernel_release(net->ipv4.fibnl);
1139 net->ipv4.fibnl = NULL;
1140 }
1141
1142 static void fib_disable_ip(struct net_device *dev, unsigned long event,
1143 bool force)
1144 {
1145 if (fib_sync_down_dev(dev, event, force))
1146 fib_flush(dev_net(dev));
1147 else
1148 rt_cache_flush(dev_net(dev));
1149 arp_ifdown(dev);
1150 }
1151
1152 static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
1153 {
1154 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
1155 struct net_device *dev = ifa->ifa_dev->dev;
1156 struct net *net = dev_net(dev);
1157
1158 switch (event) {
1159 case NETDEV_UP:
1160 fib_add_ifaddr(ifa);
1161 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1162 fib_sync_up(dev, RTNH_F_DEAD);
1163 #endif
1164 atomic_inc(&net->ipv4.dev_addr_genid);
1165 rt_cache_flush(dev_net(dev));
1166 break;
1167 case NETDEV_DOWN:
1168 fib_del_ifaddr(ifa, NULL);
1169 atomic_inc(&net->ipv4.dev_addr_genid);
1170 if (!ifa->ifa_dev->ifa_list) {
1171 /* Last address was deleted from this interface.
1172 * Disable IP.
1173 */
1174 fib_disable_ip(dev, event, true);
1175 } else {
1176 rt_cache_flush(dev_net(dev));
1177 }
1178 break;
1179 }
1180 return NOTIFY_DONE;
1181 }
1182
1183 static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
1184 {
1185 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1186 struct netdev_notifier_changeupper_info *info;
1187 struct in_device *in_dev;
1188 struct net *net = dev_net(dev);
1189 unsigned int flags;
1190
1191 if (event == NETDEV_UNREGISTER) {
1192 fib_disable_ip(dev, event, true);
1193 rt_flush_dev(dev);
1194 return NOTIFY_DONE;
1195 }
1196
1197 in_dev = __in_dev_get_rtnl(dev);
1198 if (!in_dev)
1199 return NOTIFY_DONE;
1200
1201 switch (event) {
1202 case NETDEV_UP:
1203 for_ifa(in_dev) {
1204 fib_add_ifaddr(ifa);
1205 } endfor_ifa(in_dev);
1206 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1207 fib_sync_up(dev, RTNH_F_DEAD);
1208 #endif
1209 atomic_inc(&net->ipv4.dev_addr_genid);
1210 rt_cache_flush(net);
1211 break;
1212 case NETDEV_DOWN:
1213 fib_disable_ip(dev, event, false);
1214 break;
1215 case NETDEV_CHANGE:
1216 flags = dev_get_flags(dev);
1217 if (flags & (IFF_RUNNING | IFF_LOWER_UP))
1218 fib_sync_up(dev, RTNH_F_LINKDOWN);
1219 else
1220 fib_sync_down_dev(dev, event, false);
1221 /* fall through */
1222 case NETDEV_CHANGEMTU:
1223 rt_cache_flush(net);
1224 break;
1225 case NETDEV_CHANGEUPPER:
1226 info = ptr;
1227 /* flush all routes if dev is linked to or unlinked from
1228 * an L3 master device (e.g., VRF)
1229 */
1230 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
1231 fib_disable_ip(dev, NETDEV_DOWN, true);
1232 break;
1233 }
1234 return NOTIFY_DONE;
1235 }
1236
1237 static struct notifier_block fib_inetaddr_notifier = {
1238 .notifier_call = fib_inetaddr_event,
1239 };
1240
1241 static struct notifier_block fib_netdev_notifier = {
1242 .notifier_call = fib_netdev_event,
1243 };
1244
1245 static int __net_init ip_fib_net_init(struct net *net)
1246 {
1247 int err;
1248 size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ;
1249
1250 net->ipv4.fib_seq = 0;
1251
1252 /* Avoid false sharing : Use at least a full cache line */
1253 size = max_t(size_t, size, L1_CACHE_BYTES);
1254
1255 net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL);
1256 if (!net->ipv4.fib_table_hash)
1257 return -ENOMEM;
1258
1259 err = fib4_rules_init(net);
1260 if (err < 0)
1261 goto fail;
1262 return 0;
1263
1264 fail:
1265 kfree(net->ipv4.fib_table_hash);
1266 return err;
1267 }
1268
1269 static void ip_fib_net_exit(struct net *net)
1270 {
1271 unsigned int i;
1272
1273 rtnl_lock();
1274 #ifdef CONFIG_IP_MULTIPLE_TABLES
1275 RCU_INIT_POINTER(net->ipv4.fib_main, NULL);
1276 RCU_INIT_POINTER(net->ipv4.fib_default, NULL);
1277 #endif
1278 for (i = 0; i < FIB_TABLE_HASHSZ; i++) {
1279 struct hlist_head *head = &net->ipv4.fib_table_hash[i];
1280 struct hlist_node *tmp;
1281 struct fib_table *tb;
1282
1283 hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) {
1284 hlist_del(&tb->tb_hlist);
1285 fib_table_flush(net, tb);
1286 fib_free_table(tb);
1287 }
1288 }
1289
1290 #ifdef CONFIG_IP_MULTIPLE_TABLES
1291 fib4_rules_exit(net);
1292 #endif
1293 rtnl_unlock();
1294 kfree(net->ipv4.fib_table_hash);
1295 }
1296
1297 static int __net_init fib_net_init(struct net *net)
1298 {
1299 int error;
1300
1301 #ifdef CONFIG_IP_ROUTE_CLASSID
1302 net->ipv4.fib_num_tclassid_users = 0;
1303 #endif
1304 error = ip_fib_net_init(net);
1305 if (error < 0)
1306 goto out;
1307 error = nl_fib_lookup_init(net);
1308 if (error < 0)
1309 goto out_nlfl;
1310 error = fib_proc_init(net);
1311 if (error < 0)
1312 goto out_proc;
1313 out:
1314 return error;
1315
1316 out_proc:
1317 nl_fib_lookup_exit(net);
1318 out_nlfl:
1319 ip_fib_net_exit(net);
1320 goto out;
1321 }
1322
1323 static void __net_exit fib_net_exit(struct net *net)
1324 {
1325 fib_proc_exit(net);
1326 nl_fib_lookup_exit(net);
1327 ip_fib_net_exit(net);
1328 }
1329
1330 static struct pernet_operations fib_net_ops = {
1331 .init = fib_net_init,
1332 .exit = fib_net_exit,
1333 };
1334
1335 void __init ip_fib_init(void)
1336 {
1337 rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, NULL);
1338 rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, NULL);
1339 rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, NULL);
1340
1341 register_pernet_subsys(&fib_net_ops);
1342 register_netdevice_notifier(&fib_netdev_notifier);
1343 register_inetaddr_notifier(&fib_inetaddr_notifier);
1344
1345 fib_trie_init();
1346 }
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