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Staging: hv: remove OnChildDeviceRemove vmbus_driver callback
[zen-stable.git] / net / ipv4 / devinet.c
blobdc94b0316b783fd1c1985e407fb0339782c66df5
1 /*
2 * NET3 IP device support routines.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Derived from the IP parts of dev.c 1.0.19
10 * Authors: Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
13 *
14 * Additional Authors:
15 * Alan Cox, <gw4pts@gw4pts.ampr.org>
16 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
17 *
18 * Changes:
19 * Alexey Kuznetsov: pa_* fields are replaced with ifaddr
20 * lists.
21 * Cyrus Durgin: updated for kmod
22 * Matthias Andree: in devinet_ioctl, compare label and
23 * address (4.4BSD alias style support),
24 * fall back to comparing just the label
25 * if no match found.
26 */
27
28
29 #include <asm/uaccess.h>
30 #include <asm/system.h>
31 #include <linux/bitops.h>
32 #include <linux/capability.h>
33 #include <linux/module.h>
34 #include <linux/types.h>
35 #include <linux/kernel.h>
36 #include <linux/string.h>
37 #include <linux/mm.h>
38 #include <linux/socket.h>
39 #include <linux/sockios.h>
40 #include <linux/in.h>
41 #include <linux/errno.h>
42 #include <linux/interrupt.h>
43 #include <linux/if_addr.h>
44 #include <linux/if_ether.h>
45 #include <linux/inet.h>
46 #include <linux/netdevice.h>
47 #include <linux/etherdevice.h>
48 #include <linux/skbuff.h>
49 #include <linux/init.h>
50 #include <linux/notifier.h>
51 #include <linux/inetdevice.h>
52 #include <linux/igmp.h>
53 #include <linux/slab.h>
54 #ifdef CONFIG_SYSCTL
55 #include <linux/sysctl.h>
56 #endif
57 #include <linux/kmod.h>
58
59 #include <net/arp.h>
60 #include <net/ip.h>
61 #include <net/route.h>
62 #include <net/ip_fib.h>
63 #include <net/rtnetlink.h>
64 #include <net/net_namespace.h>
65
66 static struct ipv4_devconf ipv4_devconf = {
67 .data = {
68 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
69 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
70 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
71 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
72 },
73 };
74
75 static struct ipv4_devconf ipv4_devconf_dflt = {
76 .data = {
77 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
78 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
79 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
80 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
81 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
82 },
83 };
84
85 #define IPV4_DEVCONF_DFLT(net, attr) \
86 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
87
88 static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
89 [IFA_LOCAL] = { .type = NLA_U32 },
90 [IFA_ADDRESS] = { .type = NLA_U32 },
91 [IFA_BROADCAST] = { .type = NLA_U32 },
92 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
93 };
94
95 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
96
97 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
98 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
99 int destroy);
100 #ifdef CONFIG_SYSCTL
101 static void devinet_sysctl_register(struct in_device *idev);
102 static void devinet_sysctl_unregister(struct in_device *idev);
103 #else
104 static inline void devinet_sysctl_register(struct in_device *idev)
105 {
106 }
107 static inline void devinet_sysctl_unregister(struct in_device *idev)
108 {
109 }
110 #endif
111
112 /* Locks all the inet devices. */
113
114 static struct in_ifaddr *inet_alloc_ifa(void)
115 {
116 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
117 }
118
119 static void inet_rcu_free_ifa(struct rcu_head *head)
120 {
121 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
122 if (ifa->ifa_dev)
123 in_dev_put(ifa->ifa_dev);
124 kfree(ifa);
125 }
126
127 static inline void inet_free_ifa(struct in_ifaddr *ifa)
128 {
129 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
130 }
131
132 void in_dev_finish_destroy(struct in_device *idev)
133 {
134 struct net_device *dev = idev->dev;
135
136 WARN_ON(idev->ifa_list);
137 WARN_ON(idev->mc_list);
138 #ifdef NET_REFCNT_DEBUG
139 printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n",
140 idev, dev ? dev->name : "NIL");
141 #endif
142 dev_put(dev);
143 if (!idev->dead)
144 pr_err("Freeing alive in_device %p\n", idev);
145 else
146 kfree(idev);
147 }
148 EXPORT_SYMBOL(in_dev_finish_destroy);
149
150 static struct in_device *inetdev_init(struct net_device *dev)
151 {
152 struct in_device *in_dev;
153
154 ASSERT_RTNL();
155
156 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
157 if (!in_dev)
158 goto out;
159 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
160 sizeof(in_dev->cnf));
161 in_dev->cnf.sysctl = NULL;
162 in_dev->dev = dev;
163 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
164 if (!in_dev->arp_parms)
165 goto out_kfree;
166 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
167 dev_disable_lro(dev);
168 /* Reference in_dev->dev */
169 dev_hold(dev);
170 /* Account for reference dev->ip_ptr (below) */
171 in_dev_hold(in_dev);
172
173 devinet_sysctl_register(in_dev);
174 ip_mc_init_dev(in_dev);
175 if (dev->flags & IFF_UP)
176 ip_mc_up(in_dev);
177
178 /* we can receive as soon as ip_ptr is set -- do this last */
179 rcu_assign_pointer(dev->ip_ptr, in_dev);
180 out:
181 return in_dev;
182 out_kfree:
183 kfree(in_dev);
184 in_dev = NULL;
185 goto out;
186 }
187
188 static void in_dev_rcu_put(struct rcu_head *head)
189 {
190 struct in_device *idev = container_of(head, struct in_device, rcu_head);
191 in_dev_put(idev);
192 }
193
194 static void inetdev_destroy(struct in_device *in_dev)
195 {
196 struct in_ifaddr *ifa;
197 struct net_device *dev;
198
199 ASSERT_RTNL();
200
201 dev = in_dev->dev;
202
203 in_dev->dead = 1;
204
205 ip_mc_destroy_dev(in_dev);
206
207 while ((ifa = in_dev->ifa_list) != NULL) {
208 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
209 inet_free_ifa(ifa);
210 }
211
212 rcu_assign_pointer(dev->ip_ptr, NULL);
213
214 devinet_sysctl_unregister(in_dev);
215 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
216 arp_ifdown(dev);
217
218 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
219 }
220
221 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
222 {
223 rcu_read_lock();
224 for_primary_ifa(in_dev) {
225 if (inet_ifa_match(a, ifa)) {
226 if (!b || inet_ifa_match(b, ifa)) {
227 rcu_read_unlock();
228 return 1;
229 }
230 }
231 } endfor_ifa(in_dev);
232 rcu_read_unlock();
233 return 0;
234 }
235
236 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
237 int destroy, struct nlmsghdr *nlh, u32 pid)
238 {
239 struct in_ifaddr *promote = NULL;
240 struct in_ifaddr *ifa, *ifa1 = *ifap;
241 struct in_ifaddr *last_prim = in_dev->ifa_list;
242 struct in_ifaddr *prev_prom = NULL;
243 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
244
245 ASSERT_RTNL();
246
247 /* 1. Deleting primary ifaddr forces deletion all secondaries
248 * unless alias promotion is set
249 **/
250
251 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
252 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
253
254 while ((ifa = *ifap1) != NULL) {
255 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
256 ifa1->ifa_scope <= ifa->ifa_scope)
257 last_prim = ifa;
258
259 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
260 ifa1->ifa_mask != ifa->ifa_mask ||
261 !inet_ifa_match(ifa1->ifa_address, ifa)) {
262 ifap1 = &ifa->ifa_next;
263 prev_prom = ifa;
264 continue;
265 }
266
267 if (!do_promote) {
268 *ifap1 = ifa->ifa_next;
269
270 rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid);
271 blocking_notifier_call_chain(&inetaddr_chain,
272 NETDEV_DOWN, ifa);
273 inet_free_ifa(ifa);
274 } else {
275 promote = ifa;
276 break;
277 }
278 }
279 }
280
281 /* 2. Unlink it */
282
283 *ifap = ifa1->ifa_next;
284
285 /* 3. Announce address deletion */
286
287 /* Send message first, then call notifier.
288 At first sight, FIB update triggered by notifier
289 will refer to already deleted ifaddr, that could confuse
290 netlink listeners. It is not true: look, gated sees
291 that route deleted and if it still thinks that ifaddr
292 is valid, it will try to restore deleted routes... Grr.
293 So that, this order is correct.
294 */
295 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid);
296 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
297
298 if (promote) {
299
300 if (prev_prom) {
301 prev_prom->ifa_next = promote->ifa_next;
302 promote->ifa_next = last_prim->ifa_next;
303 last_prim->ifa_next = promote;
304 }
305
306 promote->ifa_flags &= ~IFA_F_SECONDARY;
307 rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid);
308 blocking_notifier_call_chain(&inetaddr_chain,
309 NETDEV_UP, promote);
310 for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) {
311 if (ifa1->ifa_mask != ifa->ifa_mask ||
312 !inet_ifa_match(ifa1->ifa_address, ifa))
313 continue;
314 fib_add_ifaddr(ifa);
315 }
316
317 }
318 if (destroy)
319 inet_free_ifa(ifa1);
320 }
321
322 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
323 int destroy)
324 {
325 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
326 }
327
328 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
329 u32 pid)
330 {
331 struct in_device *in_dev = ifa->ifa_dev;
332 struct in_ifaddr *ifa1, **ifap, **last_primary;
333
334 ASSERT_RTNL();
335
336 if (!ifa->ifa_local) {
337 inet_free_ifa(ifa);
338 return 0;
339 }
340
341 ifa->ifa_flags &= ~IFA_F_SECONDARY;
342 last_primary = &in_dev->ifa_list;
343
344 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
345 ifap = &ifa1->ifa_next) {
346 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
347 ifa->ifa_scope <= ifa1->ifa_scope)
348 last_primary = &ifa1->ifa_next;
349 if (ifa1->ifa_mask == ifa->ifa_mask &&
350 inet_ifa_match(ifa1->ifa_address, ifa)) {
351 if (ifa1->ifa_local == ifa->ifa_local) {
352 inet_free_ifa(ifa);
353 return -EEXIST;
354 }
355 if (ifa1->ifa_scope != ifa->ifa_scope) {
356 inet_free_ifa(ifa);
357 return -EINVAL;
358 }
359 ifa->ifa_flags |= IFA_F_SECONDARY;
360 }
361 }
362
363 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
364 net_srandom(ifa->ifa_local);
365 ifap = last_primary;
366 }
367
368 ifa->ifa_next = *ifap;
369 *ifap = ifa;
370
371 /* Send message first, then call notifier.
372 Notifier will trigger FIB update, so that
373 listeners of netlink will know about new ifaddr */
374 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid);
375 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
376
377 return 0;
378 }
379
380 static int inet_insert_ifa(struct in_ifaddr *ifa)
381 {
382 return __inet_insert_ifa(ifa, NULL, 0);
383 }
384
385 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
386 {
387 struct in_device *in_dev = __in_dev_get_rtnl(dev);
388
389 ASSERT_RTNL();
390
391 if (!in_dev) {
392 inet_free_ifa(ifa);
393 return -ENOBUFS;
394 }
395 ipv4_devconf_setall(in_dev);
396 if (ifa->ifa_dev != in_dev) {
397 WARN_ON(ifa->ifa_dev);
398 in_dev_hold(in_dev);
399 ifa->ifa_dev = in_dev;
400 }
401 if (ipv4_is_loopback(ifa->ifa_local))
402 ifa->ifa_scope = RT_SCOPE_HOST;
403 return inet_insert_ifa(ifa);
404 }
405
406 /* Caller must hold RCU or RTNL :
407 * We dont take a reference on found in_device
408 */
409 struct in_device *inetdev_by_index(struct net *net, int ifindex)
410 {
411 struct net_device *dev;
412 struct in_device *in_dev = NULL;
413
414 rcu_read_lock();
415 dev = dev_get_by_index_rcu(net, ifindex);
416 if (dev)
417 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
418 rcu_read_unlock();
419 return in_dev;
420 }
421 EXPORT_SYMBOL(inetdev_by_index);
422
423 /* Called only from RTNL semaphored context. No locks. */
424
425 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
426 __be32 mask)
427 {
428 ASSERT_RTNL();
429
430 for_primary_ifa(in_dev) {
431 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
432 return ifa;
433 } endfor_ifa(in_dev);
434 return NULL;
435 }
436
437 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
438 {
439 struct net *net = sock_net(skb->sk);
440 struct nlattr *tb[IFA_MAX+1];
441 struct in_device *in_dev;
442 struct ifaddrmsg *ifm;
443 struct in_ifaddr *ifa, **ifap;
444 int err = -EINVAL;
445
446 ASSERT_RTNL();
447
448 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
449 if (err < 0)
450 goto errout;
451
452 ifm = nlmsg_data(nlh);
453 in_dev = inetdev_by_index(net, ifm->ifa_index);
454 if (in_dev == NULL) {
455 err = -ENODEV;
456 goto errout;
457 }
458
459 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
460 ifap = &ifa->ifa_next) {
461 if (tb[IFA_LOCAL] &&
462 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
463 continue;
464
465 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
466 continue;
467
468 if (tb[IFA_ADDRESS] &&
469 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
470 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
471 continue;
472
473 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid);
474 return 0;
475 }
476
477 err = -EADDRNOTAVAIL;
478 errout:
479 return err;
480 }
481
482 static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh)
483 {
484 struct nlattr *tb[IFA_MAX+1];
485 struct in_ifaddr *ifa;
486 struct ifaddrmsg *ifm;
487 struct net_device *dev;
488 struct in_device *in_dev;
489 int err;
490
491 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
492 if (err < 0)
493 goto errout;
494
495 ifm = nlmsg_data(nlh);
496 err = -EINVAL;
497 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
498 goto errout;
499
500 dev = __dev_get_by_index(net, ifm->ifa_index);
501 err = -ENODEV;
502 if (dev == NULL)
503 goto errout;
504
505 in_dev = __in_dev_get_rtnl(dev);
506 err = -ENOBUFS;
507 if (in_dev == NULL)
508 goto errout;
509
510 ifa = inet_alloc_ifa();
511 if (ifa == NULL)
512 /*
513 * A potential indev allocation can be left alive, it stays
514 * assigned to its device and is destroy with it.
515 */
516 goto errout;
517
518 ipv4_devconf_setall(in_dev);
519 in_dev_hold(in_dev);
520
521 if (tb[IFA_ADDRESS] == NULL)
522 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
523
524 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
525 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
526 ifa->ifa_flags = ifm->ifa_flags;
527 ifa->ifa_scope = ifm->ifa_scope;
528 ifa->ifa_dev = in_dev;
529
530 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
531 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
532
533 if (tb[IFA_BROADCAST])
534 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
535
536 if (tb[IFA_LABEL])
537 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
538 else
539 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
540
541 return ifa;
542
543 errout:
544 return ERR_PTR(err);
545 }
546
547 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
548 {
549 struct net *net = sock_net(skb->sk);
550 struct in_ifaddr *ifa;
551
552 ASSERT_RTNL();
553
554 ifa = rtm_to_ifaddr(net, nlh);
555 if (IS_ERR(ifa))
556 return PTR_ERR(ifa);
557
558 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid);
559 }
560
561 /*
562 * Determine a default network mask, based on the IP address.
563 */
564
565 static inline int inet_abc_len(__be32 addr)
566 {
567 int rc = -1; /* Something else, probably a multicast. */
568
569 if (ipv4_is_zeronet(addr))
570 rc = 0;
571 else {
572 __u32 haddr = ntohl(addr);
573
574 if (IN_CLASSA(haddr))
575 rc = 8;
576 else if (IN_CLASSB(haddr))
577 rc = 16;
578 else if (IN_CLASSC(haddr))
579 rc = 24;
580 }
581
582 return rc;
583 }
584
585
586 int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
587 {
588 struct ifreq ifr;
589 struct sockaddr_in sin_orig;
590 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
591 struct in_device *in_dev;
592 struct in_ifaddr **ifap = NULL;
593 struct in_ifaddr *ifa = NULL;
594 struct net_device *dev;
595 char *colon;
596 int ret = -EFAULT;
597 int tryaddrmatch = 0;
598
599 /*
600 * Fetch the caller's info block into kernel space
601 */
602
603 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
604 goto out;
605 ifr.ifr_name[IFNAMSIZ - 1] = 0;
606
607 /* save original address for comparison */
608 memcpy(&sin_orig, sin, sizeof(*sin));
609
610 colon = strchr(ifr.ifr_name, ':');
611 if (colon)
612 *colon = 0;
613
614 dev_load(net, ifr.ifr_name);
615
616 switch (cmd) {
617 case SIOCGIFADDR: /* Get interface address */
618 case SIOCGIFBRDADDR: /* Get the broadcast address */
619 case SIOCGIFDSTADDR: /* Get the destination address */
620 case SIOCGIFNETMASK: /* Get the netmask for the interface */
621 /* Note that these ioctls will not sleep,
622 so that we do not impose a lock.
623 One day we will be forced to put shlock here (I mean SMP)
624 */
625 tryaddrmatch = (sin_orig.sin_family == AF_INET);
626 memset(sin, 0, sizeof(*sin));
627 sin->sin_family = AF_INET;
628 break;
629
630 case SIOCSIFFLAGS:
631 ret = -EACCES;
632 if (!capable(CAP_NET_ADMIN))
633 goto out;
634 break;
635 case SIOCSIFADDR: /* Set interface address (and family) */
636 case SIOCSIFBRDADDR: /* Set the broadcast address */
637 case SIOCSIFDSTADDR: /* Set the destination address */
638 case SIOCSIFNETMASK: /* Set the netmask for the interface */
639 ret = -EACCES;
640 if (!capable(CAP_NET_ADMIN))
641 goto out;
642 ret = -EINVAL;
643 if (sin->sin_family != AF_INET)
644 goto out;
645 break;
646 default:
647 ret = -EINVAL;
648 goto out;
649 }
650
651 rtnl_lock();
652
653 ret = -ENODEV;
654 dev = __dev_get_by_name(net, ifr.ifr_name);
655 if (!dev)
656 goto done;
657
658 if (colon)
659 *colon = ':';
660
661 in_dev = __in_dev_get_rtnl(dev);
662 if (in_dev) {
663 if (tryaddrmatch) {
664 /* Matthias Andree */
665 /* compare label and address (4.4BSD style) */
666 /* note: we only do this for a limited set of ioctls
667 and only if the original address family was AF_INET.
668 This is checked above. */
669 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
670 ifap = &ifa->ifa_next) {
671 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
672 sin_orig.sin_addr.s_addr ==
673 ifa->ifa_address) {
674 break; /* found */
675 }
676 }
677 }
678 /* we didn't get a match, maybe the application is
679 4.3BSD-style and passed in junk so we fall back to
680 comparing just the label */
681 if (!ifa) {
682 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
683 ifap = &ifa->ifa_next)
684 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
685 break;
686 }
687 }
688
689 ret = -EADDRNOTAVAIL;
690 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
691 goto done;
692
693 switch (cmd) {
694 case SIOCGIFADDR: /* Get interface address */
695 sin->sin_addr.s_addr = ifa->ifa_local;
696 goto rarok;
697
698 case SIOCGIFBRDADDR: /* Get the broadcast address */
699 sin->sin_addr.s_addr = ifa->ifa_broadcast;
700 goto rarok;
701
702 case SIOCGIFDSTADDR: /* Get the destination address */
703 sin->sin_addr.s_addr = ifa->ifa_address;
704 goto rarok;
705
706 case SIOCGIFNETMASK: /* Get the netmask for the interface */
707 sin->sin_addr.s_addr = ifa->ifa_mask;
708 goto rarok;
709
710 case SIOCSIFFLAGS:
711 if (colon) {
712 ret = -EADDRNOTAVAIL;
713 if (!ifa)
714 break;
715 ret = 0;
716 if (!(ifr.ifr_flags & IFF_UP))
717 inet_del_ifa(in_dev, ifap, 1);
718 break;
719 }
720 ret = dev_change_flags(dev, ifr.ifr_flags);
721 break;
722
723 case SIOCSIFADDR: /* Set interface address (and family) */
724 ret = -EINVAL;
725 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
726 break;
727
728 if (!ifa) {
729 ret = -ENOBUFS;
730 ifa = inet_alloc_ifa();
731 if (!ifa)
732 break;
733 if (colon)
734 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
735 else
736 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
737 } else {
738 ret = 0;
739 if (ifa->ifa_local == sin->sin_addr.s_addr)
740 break;
741 inet_del_ifa(in_dev, ifap, 0);
742 ifa->ifa_broadcast = 0;
743 ifa->ifa_scope = 0;
744 }
745
746 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
747
748 if (!(dev->flags & IFF_POINTOPOINT)) {
749 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
750 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
751 if ((dev->flags & IFF_BROADCAST) &&
752 ifa->ifa_prefixlen < 31)
753 ifa->ifa_broadcast = ifa->ifa_address |
754 ~ifa->ifa_mask;
755 } else {
756 ifa->ifa_prefixlen = 32;
757 ifa->ifa_mask = inet_make_mask(32);
758 }
759 ret = inet_set_ifa(dev, ifa);
760 break;
761
762 case SIOCSIFBRDADDR: /* Set the broadcast address */
763 ret = 0;
764 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
765 inet_del_ifa(in_dev, ifap, 0);
766 ifa->ifa_broadcast = sin->sin_addr.s_addr;
767 inet_insert_ifa(ifa);
768 }
769 break;
770
771 case SIOCSIFDSTADDR: /* Set the destination address */
772 ret = 0;
773 if (ifa->ifa_address == sin->sin_addr.s_addr)
774 break;
775 ret = -EINVAL;
776 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
777 break;
778 ret = 0;
779 inet_del_ifa(in_dev, ifap, 0);
780 ifa->ifa_address = sin->sin_addr.s_addr;
781 inet_insert_ifa(ifa);
782 break;
783
784 case SIOCSIFNETMASK: /* Set the netmask for the interface */
785
786 /*
787 * The mask we set must be legal.
788 */
789 ret = -EINVAL;
790 if (bad_mask(sin->sin_addr.s_addr, 0))
791 break;
792 ret = 0;
793 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
794 __be32 old_mask = ifa->ifa_mask;
795 inet_del_ifa(in_dev, ifap, 0);
796 ifa->ifa_mask = sin->sin_addr.s_addr;
797 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
798
799 /* See if current broadcast address matches
800 * with current netmask, then recalculate
801 * the broadcast address. Otherwise it's a
802 * funny address, so don't touch it since
803 * the user seems to know what (s)he's doing...
804 */
805 if ((dev->flags & IFF_BROADCAST) &&
806 (ifa->ifa_prefixlen < 31) &&
807 (ifa->ifa_broadcast ==
808 (ifa->ifa_local|~old_mask))) {
809 ifa->ifa_broadcast = (ifa->ifa_local |
810 ~sin->sin_addr.s_addr);
811 }
812 inet_insert_ifa(ifa);
813 }
814 break;
815 }
816 done:
817 rtnl_unlock();
818 out:
819 return ret;
820 rarok:
821 rtnl_unlock();
822 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
823 goto out;
824 }
825
826 static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
827 {
828 struct in_device *in_dev = __in_dev_get_rtnl(dev);
829 struct in_ifaddr *ifa;
830 struct ifreq ifr;
831 int done = 0;
832
833 if (!in_dev)
834 goto out;
835
836 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
837 if (!buf) {
838 done += sizeof(ifr);
839 continue;
840 }
841 if (len < (int) sizeof(ifr))
842 break;
843 memset(&ifr, 0, sizeof(struct ifreq));
844 if (ifa->ifa_label)
845 strcpy(ifr.ifr_name, ifa->ifa_label);
846 else
847 strcpy(ifr.ifr_name, dev->name);
848
849 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
850 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
851 ifa->ifa_local;
852
853 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
854 done = -EFAULT;
855 break;
856 }
857 buf += sizeof(struct ifreq);
858 len -= sizeof(struct ifreq);
859 done += sizeof(struct ifreq);
860 }
861 out:
862 return done;
863 }
864
865 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
866 {
867 __be32 addr = 0;
868 struct in_device *in_dev;
869 struct net *net = dev_net(dev);
870
871 rcu_read_lock();
872 in_dev = __in_dev_get_rcu(dev);
873 if (!in_dev)
874 goto no_in_dev;
875
876 for_primary_ifa(in_dev) {
877 if (ifa->ifa_scope > scope)
878 continue;
879 if (!dst || inet_ifa_match(dst, ifa)) {
880 addr = ifa->ifa_local;
881 break;
882 }
883 if (!addr)
884 addr = ifa->ifa_local;
885 } endfor_ifa(in_dev);
886
887 if (addr)
888 goto out_unlock;
889 no_in_dev:
890
891 /* Not loopback addresses on loopback should be preferred
892 in this case. It is importnat that lo is the first interface
893 in dev_base list.
894 */
895 for_each_netdev_rcu(net, dev) {
896 in_dev = __in_dev_get_rcu(dev);
897 if (!in_dev)
898 continue;
899
900 for_primary_ifa(in_dev) {
901 if (ifa->ifa_scope != RT_SCOPE_LINK &&
902 ifa->ifa_scope <= scope) {
903 addr = ifa->ifa_local;
904 goto out_unlock;
905 }
906 } endfor_ifa(in_dev);
907 }
908 out_unlock:
909 rcu_read_unlock();
910 return addr;
911 }
912 EXPORT_SYMBOL(inet_select_addr);
913
914 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
915 __be32 local, int scope)
916 {
917 int same = 0;
918 __be32 addr = 0;
919
920 for_ifa(in_dev) {
921 if (!addr &&
922 (local == ifa->ifa_local || !local) &&
923 ifa->ifa_scope <= scope) {
924 addr = ifa->ifa_local;
925 if (same)
926 break;
927 }
928 if (!same) {
929 same = (!local || inet_ifa_match(local, ifa)) &&
930 (!dst || inet_ifa_match(dst, ifa));
931 if (same && addr) {
932 if (local || !dst)
933 break;
934 /* Is the selected addr into dst subnet? */
935 if (inet_ifa_match(addr, ifa))
936 break;
937 /* No, then can we use new local src? */
938 if (ifa->ifa_scope <= scope) {
939 addr = ifa->ifa_local;
940 break;
941 }
942 /* search for large dst subnet for addr */
943 same = 0;
944 }
945 }
946 } endfor_ifa(in_dev);
947
948 return same ? addr : 0;
949 }
950
951 /*
952 * Confirm that local IP address exists using wildcards:
953 * - in_dev: only on this interface, 0=any interface
954 * - dst: only in the same subnet as dst, 0=any dst
955 * - local: address, 0=autoselect the local address
956 * - scope: maximum allowed scope value for the local address
957 */
958 __be32 inet_confirm_addr(struct in_device *in_dev,
959 __be32 dst, __be32 local, int scope)
960 {
961 __be32 addr = 0;
962 struct net_device *dev;
963 struct net *net;
964
965 if (scope != RT_SCOPE_LINK)
966 return confirm_addr_indev(in_dev, dst, local, scope);
967
968 net = dev_net(in_dev->dev);
969 rcu_read_lock();
970 for_each_netdev_rcu(net, dev) {
971 in_dev = __in_dev_get_rcu(dev);
972 if (in_dev) {
973 addr = confirm_addr_indev(in_dev, dst, local, scope);
974 if (addr)
975 break;
976 }
977 }
978 rcu_read_unlock();
979
980 return addr;
981 }
982
983 /*
984 * Device notifier
985 */
986
987 int register_inetaddr_notifier(struct notifier_block *nb)
988 {
989 return blocking_notifier_chain_register(&inetaddr_chain, nb);
990 }
991 EXPORT_SYMBOL(register_inetaddr_notifier);
992
993 int unregister_inetaddr_notifier(struct notifier_block *nb)
994 {
995 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
996 }
997 EXPORT_SYMBOL(unregister_inetaddr_notifier);
998
999 /* Rename ifa_labels for a device name change. Make some effort to preserve
1000 * existing alias numbering and to create unique labels if possible.
1001 */
1002 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1003 {
1004 struct in_ifaddr *ifa;
1005 int named = 0;
1006
1007 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1008 char old[IFNAMSIZ], *dot;
1009
1010 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1011 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1012 if (named++ == 0)
1013 goto skip;
1014 dot = strchr(old, ':');
1015 if (dot == NULL) {
1016 sprintf(old, ":%d", named);
1017 dot = old;
1018 }
1019 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1020 strcat(ifa->ifa_label, dot);
1021 else
1022 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1023 skip:
1024 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1025 }
1026 }
1027
1028 static inline bool inetdev_valid_mtu(unsigned mtu)
1029 {
1030 return mtu >= 68;
1031 }
1032
1033 /* Called only under RTNL semaphore */
1034
1035 static int inetdev_event(struct notifier_block *this, unsigned long event,
1036 void *ptr)
1037 {
1038 struct net_device *dev = ptr;
1039 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1040
1041 ASSERT_RTNL();
1042
1043 if (!in_dev) {
1044 if (event == NETDEV_REGISTER) {
1045 in_dev = inetdev_init(dev);
1046 if (!in_dev)
1047 return notifier_from_errno(-ENOMEM);
1048 if (dev->flags & IFF_LOOPBACK) {
1049 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1050 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1051 }
1052 } else if (event == NETDEV_CHANGEMTU) {
1053 /* Re-enabling IP */
1054 if (inetdev_valid_mtu(dev->mtu))
1055 in_dev = inetdev_init(dev);
1056 }
1057 goto out;
1058 }
1059
1060 switch (event) {
1061 case NETDEV_REGISTER:
1062 printk(KERN_DEBUG "inetdev_event: bug\n");
1063 rcu_assign_pointer(dev->ip_ptr, NULL);
1064 break;
1065 case NETDEV_UP:
1066 if (!inetdev_valid_mtu(dev->mtu))
1067 break;
1068 if (dev->flags & IFF_LOOPBACK) {
1069 struct in_ifaddr *ifa = inet_alloc_ifa();
1070
1071 if (ifa) {
1072 ifa->ifa_local =
1073 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1074 ifa->ifa_prefixlen = 8;
1075 ifa->ifa_mask = inet_make_mask(8);
1076 in_dev_hold(in_dev);
1077 ifa->ifa_dev = in_dev;
1078 ifa->ifa_scope = RT_SCOPE_HOST;
1079 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1080 inet_insert_ifa(ifa);
1081 }
1082 }
1083 ip_mc_up(in_dev);
1084 /* fall through */
1085 case NETDEV_NOTIFY_PEERS:
1086 case NETDEV_CHANGEADDR:
1087 /* Send gratuitous ARP to notify of link change */
1088 if (IN_DEV_ARP_NOTIFY(in_dev)) {
1089 struct in_ifaddr *ifa = in_dev->ifa_list;
1090
1091 if (ifa)
1092 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1093 ifa->ifa_address, dev,
1094 ifa->ifa_address, NULL,
1095 dev->dev_addr, NULL);
1096 }
1097 break;
1098 case NETDEV_DOWN:
1099 ip_mc_down(in_dev);
1100 break;
1101 case NETDEV_PRE_TYPE_CHANGE:
1102 ip_mc_unmap(in_dev);
1103 break;
1104 case NETDEV_POST_TYPE_CHANGE:
1105 ip_mc_remap(in_dev);
1106 break;
1107 case NETDEV_CHANGEMTU:
1108 if (inetdev_valid_mtu(dev->mtu))
1109 break;
1110 /* disable IP when MTU is not enough */
1111 case NETDEV_UNREGISTER:
1112 inetdev_destroy(in_dev);
1113 break;
1114 case NETDEV_CHANGENAME:
1115 /* Do not notify about label change, this event is
1116 * not interesting to applications using netlink.
1117 */
1118 inetdev_changename(dev, in_dev);
1119
1120 devinet_sysctl_unregister(in_dev);
1121 devinet_sysctl_register(in_dev);
1122 break;
1123 }
1124 out:
1125 return NOTIFY_DONE;
1126 }
1127
1128 static struct notifier_block ip_netdev_notifier = {
1129 .notifier_call = inetdev_event,
1130 };
1131
1132 static inline size_t inet_nlmsg_size(void)
1133 {
1134 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1135 + nla_total_size(4) /* IFA_ADDRESS */
1136 + nla_total_size(4) /* IFA_LOCAL */
1137 + nla_total_size(4) /* IFA_BROADCAST */
1138 + nla_total_size(IFNAMSIZ); /* IFA_LABEL */
1139 }
1140
1141 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1142 u32 pid, u32 seq, int event, unsigned int flags)
1143 {
1144 struct ifaddrmsg *ifm;
1145 struct nlmsghdr *nlh;
1146
1147 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
1148 if (nlh == NULL)
1149 return -EMSGSIZE;
1150
1151 ifm = nlmsg_data(nlh);
1152 ifm->ifa_family = AF_INET;
1153 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1154 ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
1155 ifm->ifa_scope = ifa->ifa_scope;
1156 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1157
1158 if (ifa->ifa_address)
1159 NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address);
1160
1161 if (ifa->ifa_local)
1162 NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local);
1163
1164 if (ifa->ifa_broadcast)
1165 NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast);
1166
1167 if (ifa->ifa_label[0])
1168 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
1169
1170 return nlmsg_end(skb, nlh);
1171
1172 nla_put_failure:
1173 nlmsg_cancel(skb, nlh);
1174 return -EMSGSIZE;
1175 }
1176
1177 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1178 {
1179 struct net *net = sock_net(skb->sk);
1180 int h, s_h;
1181 int idx, s_idx;
1182 int ip_idx, s_ip_idx;
1183 struct net_device *dev;
1184 struct in_device *in_dev;
1185 struct in_ifaddr *ifa;
1186 struct hlist_head *head;
1187 struct hlist_node *node;
1188
1189 s_h = cb->args[0];
1190 s_idx = idx = cb->args[1];
1191 s_ip_idx = ip_idx = cb->args[2];
1192
1193 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1194 idx = 0;
1195 head = &net->dev_index_head[h];
1196 rcu_read_lock();
1197 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
1198 if (idx < s_idx)
1199 goto cont;
1200 if (h > s_h || idx > s_idx)
1201 s_ip_idx = 0;
1202 in_dev = __in_dev_get_rcu(dev);
1203 if (!in_dev)
1204 goto cont;
1205
1206 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1207 ifa = ifa->ifa_next, ip_idx++) {
1208 if (ip_idx < s_ip_idx)
1209 continue;
1210 if (inet_fill_ifaddr(skb, ifa,
1211 NETLINK_CB(cb->skb).pid,
1212 cb->nlh->nlmsg_seq,
1213 RTM_NEWADDR, NLM_F_MULTI) <= 0) {
1214 rcu_read_unlock();
1215 goto done;
1216 }
1217 }
1218 cont:
1219 idx++;
1220 }
1221 rcu_read_unlock();
1222 }
1223
1224 done:
1225 cb->args[0] = h;
1226 cb->args[1] = idx;
1227 cb->args[2] = ip_idx;
1228
1229 return skb->len;
1230 }
1231
1232 static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1233 u32 pid)
1234 {
1235 struct sk_buff *skb;
1236 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1237 int err = -ENOBUFS;
1238 struct net *net;
1239
1240 net = dev_net(ifa->ifa_dev->dev);
1241 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1242 if (skb == NULL)
1243 goto errout;
1244
1245 err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0);
1246 if (err < 0) {
1247 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1248 WARN_ON(err == -EMSGSIZE);
1249 kfree_skb(skb);
1250 goto errout;
1251 }
1252 rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1253 return;
1254 errout:
1255 if (err < 0)
1256 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1257 }
1258
1259 #ifdef CONFIG_SYSCTL
1260
1261 static void devinet_copy_dflt_conf(struct net *net, int i)
1262 {
1263 struct net_device *dev;
1264
1265 rcu_read_lock();
1266 for_each_netdev_rcu(net, dev) {
1267 struct in_device *in_dev;
1268
1269 in_dev = __in_dev_get_rcu(dev);
1270 if (in_dev && !test_bit(i, in_dev->cnf.state))
1271 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
1272 }
1273 rcu_read_unlock();
1274 }
1275
1276 /* called with RTNL locked */
1277 static void inet_forward_change(struct net *net)
1278 {
1279 struct net_device *dev;
1280 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
1281
1282 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
1283 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
1284
1285 for_each_netdev(net, dev) {
1286 struct in_device *in_dev;
1287 if (on)
1288 dev_disable_lro(dev);
1289 rcu_read_lock();
1290 in_dev = __in_dev_get_rcu(dev);
1291 if (in_dev)
1292 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
1293 rcu_read_unlock();
1294 }
1295 }
1296
1297 static int devinet_conf_proc(ctl_table *ctl, int write,
1298 void __user *buffer,
1299 size_t *lenp, loff_t *ppos)
1300 {
1301 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1302
1303 if (write) {
1304 struct ipv4_devconf *cnf = ctl->extra1;
1305 struct net *net = ctl->extra2;
1306 int i = (int *)ctl->data - cnf->data;
1307
1308 set_bit(i, cnf->state);
1309
1310 if (cnf == net->ipv4.devconf_dflt)
1311 devinet_copy_dflt_conf(net, i);
1312 }
1313
1314 return ret;
1315 }
1316
1317 static int devinet_sysctl_forward(ctl_table *ctl, int write,
1318 void __user *buffer,
1319 size_t *lenp, loff_t *ppos)
1320 {
1321 int *valp = ctl->data;
1322 int val = *valp;
1323 loff_t pos = *ppos;
1324 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1325
1326 if (write && *valp != val) {
1327 struct net *net = ctl->extra2;
1328
1329 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
1330 if (!rtnl_trylock()) {
1331 /* Restore the original values before restarting */
1332 *valp = val;
1333 *ppos = pos;
1334 return restart_syscall();
1335 }
1336 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
1337 inet_forward_change(net);
1338 } else if (*valp) {
1339 struct ipv4_devconf *cnf = ctl->extra1;
1340 struct in_device *idev =
1341 container_of(cnf, struct in_device, cnf);
1342 dev_disable_lro(idev->dev);
1343 }
1344 rtnl_unlock();
1345 rt_cache_flush(net, 0);
1346 }
1347 }
1348
1349 return ret;
1350 }
1351
1352 int ipv4_doint_and_flush(ctl_table *ctl, int write,
1353 void __user *buffer,
1354 size_t *lenp, loff_t *ppos)
1355 {
1356 int *valp = ctl->data;
1357 int val = *valp;
1358 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1359 struct net *net = ctl->extra2;
1360
1361 if (write && *valp != val)
1362 rt_cache_flush(net, 0);
1363
1364 return ret;
1365 }
1366
1367 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
1368 { \
1369 .procname = name, \
1370 .data = ipv4_devconf.data + \
1371 IPV4_DEVCONF_ ## attr - 1, \
1372 .maxlen = sizeof(int), \
1373 .mode = mval, \
1374 .proc_handler = proc, \
1375 .extra1 = &ipv4_devconf, \
1376 }
1377
1378 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
1379 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
1380
1381 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
1382 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
1383
1384 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
1385 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
1386
1387 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
1388 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
1389
1390 static struct devinet_sysctl_table {
1391 struct ctl_table_header *sysctl_header;
1392 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
1393 char *dev_name;
1394 } devinet_sysctl = {
1395 .devinet_vars = {
1396 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
1397 devinet_sysctl_forward),
1398 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
1399
1400 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
1401 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
1402 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
1403 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
1404 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
1405 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
1406 "accept_source_route"),
1407 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
1408 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
1409 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
1410 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
1411 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
1412 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
1413 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
1414 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
1415 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
1416 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
1417 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
1418 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
1419 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
1420
1421 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
1422 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
1423 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
1424 "force_igmp_version"),
1425 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
1426 "promote_secondaries"),
1427 },
1428 };
1429
1430 static int __devinet_sysctl_register(struct net *net, char *dev_name,
1431 struct ipv4_devconf *p)
1432 {
1433 int i;
1434 struct devinet_sysctl_table *t;
1435
1436 #define DEVINET_CTL_PATH_DEV 3
1437
1438 struct ctl_path devinet_ctl_path[] = {
1439 { .procname = "net", },
1440 { .procname = "ipv4", },
1441 { .procname = "conf", },
1442 { /* to be set */ },
1443 { },
1444 };
1445
1446 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1447 if (!t)
1448 goto out;
1449
1450 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
1451 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
1452 t->devinet_vars[i].extra1 = p;
1453 t->devinet_vars[i].extra2 = net;
1454 }
1455
1456 /*
1457 * Make a copy of dev_name, because '.procname' is regarded as const
1458 * by sysctl and we wouldn't want anyone to change it under our feet
1459 * (see SIOCSIFNAME).
1460 */
1461 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
1462 if (!t->dev_name)
1463 goto free;
1464
1465 devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name;
1466
1467 t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path,
1468 t->devinet_vars);
1469 if (!t->sysctl_header)
1470 goto free_procname;
1471
1472 p->sysctl = t;
1473 return 0;
1474
1475 free_procname:
1476 kfree(t->dev_name);
1477 free:
1478 kfree(t);
1479 out:
1480 return -ENOBUFS;
1481 }
1482
1483 static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
1484 {
1485 struct devinet_sysctl_table *t = cnf->sysctl;
1486
1487 if (t == NULL)
1488 return;
1489
1490 cnf->sysctl = NULL;
1491 unregister_sysctl_table(t->sysctl_header);
1492 kfree(t->dev_name);
1493 kfree(t);
1494 }
1495
1496 static void devinet_sysctl_register(struct in_device *idev)
1497 {
1498 neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL);
1499 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
1500 &idev->cnf);
1501 }
1502
1503 static void devinet_sysctl_unregister(struct in_device *idev)
1504 {
1505 __devinet_sysctl_unregister(&idev->cnf);
1506 neigh_sysctl_unregister(idev->arp_parms);
1507 }
1508
1509 static struct ctl_table ctl_forward_entry[] = {
1510 {
1511 .procname = "ip_forward",
1512 .data = &ipv4_devconf.data[
1513 IPV4_DEVCONF_FORWARDING - 1],
1514 .maxlen = sizeof(int),
1515 .mode = 0644,
1516 .proc_handler = devinet_sysctl_forward,
1517 .extra1 = &ipv4_devconf,
1518 .extra2 = &init_net,
1519 },
1520 { },
1521 };
1522
1523 static __net_initdata struct ctl_path net_ipv4_path[] = {
1524 { .procname = "net", },
1525 { .procname = "ipv4", },
1526 { },
1527 };
1528 #endif
1529
1530 static __net_init int devinet_init_net(struct net *net)
1531 {
1532 int err;
1533 struct ipv4_devconf *all, *dflt;
1534 #ifdef CONFIG_SYSCTL
1535 struct ctl_table *tbl = ctl_forward_entry;
1536 struct ctl_table_header *forw_hdr;
1537 #endif
1538
1539 err = -ENOMEM;
1540 all = &ipv4_devconf;
1541 dflt = &ipv4_devconf_dflt;
1542
1543 if (!net_eq(net, &init_net)) {
1544 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
1545 if (all == NULL)
1546 goto err_alloc_all;
1547
1548 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
1549 if (dflt == NULL)
1550 goto err_alloc_dflt;
1551
1552 #ifdef CONFIG_SYSCTL
1553 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
1554 if (tbl == NULL)
1555 goto err_alloc_ctl;
1556
1557 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
1558 tbl[0].extra1 = all;
1559 tbl[0].extra2 = net;
1560 #endif
1561 }
1562
1563 #ifdef CONFIG_SYSCTL
1564 err = __devinet_sysctl_register(net, "all", all);
1565 if (err < 0)
1566 goto err_reg_all;
1567
1568 err = __devinet_sysctl_register(net, "default", dflt);
1569 if (err < 0)
1570 goto err_reg_dflt;
1571
1572 err = -ENOMEM;
1573 forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl);
1574 if (forw_hdr == NULL)
1575 goto err_reg_ctl;
1576 net->ipv4.forw_hdr = forw_hdr;
1577 #endif
1578
1579 net->ipv4.devconf_all = all;
1580 net->ipv4.devconf_dflt = dflt;
1581 return 0;
1582
1583 #ifdef CONFIG_SYSCTL
1584 err_reg_ctl:
1585 __devinet_sysctl_unregister(dflt);
1586 err_reg_dflt:
1587 __devinet_sysctl_unregister(all);
1588 err_reg_all:
1589 if (tbl != ctl_forward_entry)
1590 kfree(tbl);
1591 err_alloc_ctl:
1592 #endif
1593 if (dflt != &ipv4_devconf_dflt)
1594 kfree(dflt);
1595 err_alloc_dflt:
1596 if (all != &ipv4_devconf)
1597 kfree(all);
1598 err_alloc_all:
1599 return err;
1600 }
1601
1602 static __net_exit void devinet_exit_net(struct net *net)
1603 {
1604 #ifdef CONFIG_SYSCTL
1605 struct ctl_table *tbl;
1606
1607 tbl = net->ipv4.forw_hdr->ctl_table_arg;
1608 unregister_net_sysctl_table(net->ipv4.forw_hdr);
1609 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
1610 __devinet_sysctl_unregister(net->ipv4.devconf_all);
1611 kfree(tbl);
1612 #endif
1613 kfree(net->ipv4.devconf_dflt);
1614 kfree(net->ipv4.devconf_all);
1615 }
1616
1617 static __net_initdata struct pernet_operations devinet_ops = {
1618 .init = devinet_init_net,
1619 .exit = devinet_exit_net,
1620 };
1621
1622 void __init devinet_init(void)
1623 {
1624 register_pernet_subsys(&devinet_ops);
1625
1626 register_gifconf(PF_INET, inet_gifconf);
1627 register_netdevice_notifier(&ip_netdev_notifier);
1628
1629 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL);
1630 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL);
1631 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr);
1632 }
1633