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 #ifdef CONFIG_SYSCTL
54 #include <linux/sysctl.h>
55 #endif
56 #include <linux/kmod.h>
57
58 #include <net/arp.h>
59 #include <net/ip.h>
60 #include <net/route.h>
61 #include <net/ip_fib.h>
62 #include <net/rtnetlink.h>
63 #include <net/net_namespace.h>
64
65 static struct ipv4_devconf ipv4_devconf = {
66 .data = {
67 [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1,
68 [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1,
69 [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1,
70 [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1,
71 },
72 };
73
74 static struct ipv4_devconf ipv4_devconf_dflt = {
75 .data = {
76 [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1,
77 [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1,
78 [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1,
79 [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1,
80 [NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
81 },
82 };
83
84 #define IPV4_DEVCONF_DFLT(net, attr) \
85 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
86
87 static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
88 [IFA_LOCAL] = { .type = NLA_U32 },
89 [IFA_ADDRESS] = { .type = NLA_U32 },
90 [IFA_BROADCAST] = { .type = NLA_U32 },
91 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
92 };
93
94 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
95
96 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
97 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
98 int destroy);
99 #ifdef CONFIG_SYSCTL
100 static void devinet_sysctl_register(struct in_device *idev);
101 static void devinet_sysctl_unregister(struct in_device *idev);
102 #else
103 static inline void devinet_sysctl_register(struct in_device *idev)
104 {
105 }
106 static inline void devinet_sysctl_unregister(struct in_device *idev)
107 {
108 }
109 #endif
110
111 /* Locks all the inet devices. */
112
113 static struct in_ifaddr *inet_alloc_ifa(void)
114 {
115 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
116 }
117
118 static void inet_rcu_free_ifa(struct rcu_head *head)
119 {
120 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
121 if (ifa->ifa_dev)
122 in_dev_put(ifa->ifa_dev);
123 kfree(ifa);
124 }
125
126 static inline void inet_free_ifa(struct in_ifaddr *ifa)
127 {
128 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
129 }
130
131 void in_dev_finish_destroy(struct in_device *idev)
132 {
133 struct net_device *dev = idev->dev;
134
135 WARN_ON(idev->ifa_list);
136 WARN_ON(idev->mc_list);
137 #ifdef NET_REFCNT_DEBUG
138 printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n",
139 idev, dev ? dev->name : "NIL");
140 #endif
141 dev_put(dev);
142 if (!idev->dead)
143 printk("Freeing alive in_device %p\n", idev);
144 else {
145 kfree(idev);
146 }
147 }
148
149 static struct in_device *inetdev_init(struct net_device *dev)
150 {
151 struct in_device *in_dev;
152
153 ASSERT_RTNL();
154
155 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
156 if (!in_dev)
157 goto out;
158 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
159 sizeof(in_dev->cnf));
160 in_dev->cnf.sysctl = NULL;
161 in_dev->dev = dev;
162 if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL)
163 goto out_kfree;
164 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
165 dev_disable_lro(dev);
166 /* Reference in_dev->dev */
167 dev_hold(dev);
168 /* Account for reference dev->ip_ptr (below) */
169 in_dev_hold(in_dev);
170
171 devinet_sysctl_register(in_dev);
172 ip_mc_init_dev(in_dev);
173 if (dev->flags & IFF_UP)
174 ip_mc_up(in_dev);
175
176 /* we can receive as soon as ip_ptr is set -- do this last */
177 rcu_assign_pointer(dev->ip_ptr, in_dev);
178 out:
179 return in_dev;
180 out_kfree:
181 kfree(in_dev);
182 in_dev = NULL;
183 goto out;
184 }
185
186 static void in_dev_rcu_put(struct rcu_head *head)
187 {
188 struct in_device *idev = container_of(head, struct in_device, rcu_head);
189 in_dev_put(idev);
190 }
191
192 static void inetdev_destroy(struct in_device *in_dev)
193 {
194 struct in_ifaddr *ifa;
195 struct net_device *dev;
196
197 ASSERT_RTNL();
198
199 dev = in_dev->dev;
200
201 in_dev->dead = 1;
202
203 ip_mc_destroy_dev(in_dev);
204
205 while ((ifa = in_dev->ifa_list) != NULL) {
206 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
207 inet_free_ifa(ifa);
208 }
209
210 dev->ip_ptr = NULL;
211
212 devinet_sysctl_unregister(in_dev);
213 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
214 arp_ifdown(dev);
215
216 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
217 }
218
219 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
220 {
221 rcu_read_lock();
222 for_primary_ifa(in_dev) {
223 if (inet_ifa_match(a, ifa)) {
224 if (!b || inet_ifa_match(b, ifa)) {
225 rcu_read_unlock();
226 return 1;
227 }
228 }
229 } endfor_ifa(in_dev);
230 rcu_read_unlock();
231 return 0;
232 }
233
234 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
235 int destroy, struct nlmsghdr *nlh, u32 pid)
236 {
237 struct in_ifaddr *promote = NULL;
238 struct in_ifaddr *ifa, *ifa1 = *ifap;
239 struct in_ifaddr *last_prim = in_dev->ifa_list;
240 struct in_ifaddr *prev_prom = NULL;
241 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
242
243 ASSERT_RTNL();
244
245 /* 1. Deleting primary ifaddr forces deletion all secondaries
246 * unless alias promotion is set
247 **/
248
249 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
250 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
251
252 while ((ifa = *ifap1) != NULL) {
253 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
254 ifa1->ifa_scope <= ifa->ifa_scope)
255 last_prim = ifa;
256
257 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
258 ifa1->ifa_mask != ifa->ifa_mask ||
259 !inet_ifa_match(ifa1->ifa_address, ifa)) {
260 ifap1 = &ifa->ifa_next;
261 prev_prom = ifa;
262 continue;
263 }
264
265 if (!do_promote) {
266 *ifap1 = ifa->ifa_next;
267
268 rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid);
269 blocking_notifier_call_chain(&inetaddr_chain,
270 NETDEV_DOWN, ifa);
271 inet_free_ifa(ifa);
272 } else {
273 promote = ifa;
274 break;
275 }
276 }
277 }
278
279 /* 2. Unlink it */
280
281 *ifap = ifa1->ifa_next;
282
283 /* 3. Announce address deletion */
284
285 /* Send message first, then call notifier.
286 At first sight, FIB update triggered by notifier
287 will refer to already deleted ifaddr, that could confuse
288 netlink listeners. It is not true: look, gated sees
289 that route deleted and if it still thinks that ifaddr
290 is valid, it will try to restore deleted routes... Grr.
291 So that, this order is correct.
292 */
293 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid);
294 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
295
296 if (promote) {
297
298 if (prev_prom) {
299 prev_prom->ifa_next = promote->ifa_next;
300 promote->ifa_next = last_prim->ifa_next;
301 last_prim->ifa_next = promote;
302 }
303
304 promote->ifa_flags &= ~IFA_F_SECONDARY;
305 rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid);
306 blocking_notifier_call_chain(&inetaddr_chain,
307 NETDEV_UP, promote);
308 for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) {
309 if (ifa1->ifa_mask != ifa->ifa_mask ||
310 !inet_ifa_match(ifa1->ifa_address, ifa))
311 continue;
312 fib_add_ifaddr(ifa);
313 }
314
315 }
316 if (destroy)
317 inet_free_ifa(ifa1);
318 }
319
320 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
321 int destroy)
322 {
323 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
324 }
325
326 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
327 u32 pid)
328 {
329 struct in_device *in_dev = ifa->ifa_dev;
330 struct in_ifaddr *ifa1, **ifap, **last_primary;
331
332 ASSERT_RTNL();
333
334 if (!ifa->ifa_local) {
335 inet_free_ifa(ifa);
336 return 0;
337 }
338
339 ifa->ifa_flags &= ~IFA_F_SECONDARY;
340 last_primary = &in_dev->ifa_list;
341
342 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
343 ifap = &ifa1->ifa_next) {
344 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
345 ifa->ifa_scope <= ifa1->ifa_scope)
346 last_primary = &ifa1->ifa_next;
347 if (ifa1->ifa_mask == ifa->ifa_mask &&
348 inet_ifa_match(ifa1->ifa_address, ifa)) {
349 if (ifa1->ifa_local == ifa->ifa_local) {
350 inet_free_ifa(ifa);
351 return -EEXIST;
352 }
353 if (ifa1->ifa_scope != ifa->ifa_scope) {
354 inet_free_ifa(ifa);
355 return -EINVAL;
356 }
357 ifa->ifa_flags |= IFA_F_SECONDARY;
358 }
359 }
360
361 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
362 net_srandom(ifa->ifa_local);
363 ifap = last_primary;
364 }
365
366 ifa->ifa_next = *ifap;
367 *ifap = ifa;
368
369 /* Send message first, then call notifier.
370 Notifier will trigger FIB update, so that
371 listeners of netlink will know about new ifaddr */
372 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid);
373 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
374
375 return 0;
376 }
377
378 static int inet_insert_ifa(struct in_ifaddr *ifa)
379 {
380 return __inet_insert_ifa(ifa, NULL, 0);
381 }
382
383 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
384 {
385 struct in_device *in_dev = __in_dev_get_rtnl(dev);
386
387 ASSERT_RTNL();
388
389 if (!in_dev) {
390 inet_free_ifa(ifa);
391 return -ENOBUFS;
392 }
393 ipv4_devconf_setall(in_dev);
394 if (ifa->ifa_dev != in_dev) {
395 WARN_ON(ifa->ifa_dev);
396 in_dev_hold(in_dev);
397 ifa->ifa_dev = in_dev;
398 }
399 if (ipv4_is_loopback(ifa->ifa_local))
400 ifa->ifa_scope = RT_SCOPE_HOST;
401 return inet_insert_ifa(ifa);
402 }
403
404 struct in_device *inetdev_by_index(struct net *net, int ifindex)
405 {
406 struct net_device *dev;
407 struct in_device *in_dev = NULL;
408 read_lock(&dev_base_lock);
409 dev = __dev_get_by_index(net, ifindex);
410 if (dev)
411 in_dev = in_dev_get(dev);
412 read_unlock(&dev_base_lock);
413 return in_dev;
414 }
415
416 /* Called only from RTNL semaphored context. No locks. */
417
418 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
419 __be32 mask)
420 {
421 ASSERT_RTNL();
422
423 for_primary_ifa(in_dev) {
424 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
425 return ifa;
426 } endfor_ifa(in_dev);
427 return NULL;
428 }
429
430 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
431 {
432 struct net *net = sock_net(skb->sk);
433 struct nlattr *tb[IFA_MAX+1];
434 struct in_device *in_dev;
435 struct ifaddrmsg *ifm;
436 struct in_ifaddr *ifa, **ifap;
437 int err = -EINVAL;
438
439 ASSERT_RTNL();
440
441 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
442 if (err < 0)
443 goto errout;
444
445 ifm = nlmsg_data(nlh);
446 in_dev = inetdev_by_index(net, ifm->ifa_index);
447 if (in_dev == NULL) {
448 err = -ENODEV;
449 goto errout;
450 }
451
452 __in_dev_put(in_dev);
453
454 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
455 ifap = &ifa->ifa_next) {
456 if (tb[IFA_LOCAL] &&
457 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
458 continue;
459
460 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
461 continue;
462
463 if (tb[IFA_ADDRESS] &&
464 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
465 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
466 continue;
467
468 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid);
469 return 0;
470 }
471
472 err = -EADDRNOTAVAIL;
473 errout:
474 return err;
475 }
476
477 static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh)
478 {
479 struct nlattr *tb[IFA_MAX+1];
480 struct in_ifaddr *ifa;
481 struct ifaddrmsg *ifm;
482 struct net_device *dev;
483 struct in_device *in_dev;
484 int err;
485
486 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
487 if (err < 0)
488 goto errout;
489
490 ifm = nlmsg_data(nlh);
491 err = -EINVAL;
492 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
493 goto errout;
494
495 dev = __dev_get_by_index(net, ifm->ifa_index);
496 err = -ENODEV;
497 if (dev == NULL)
498 goto errout;
499
500 in_dev = __in_dev_get_rtnl(dev);
501 err = -ENOBUFS;
502 if (in_dev == NULL)
503 goto errout;
504
505 ifa = inet_alloc_ifa();
506 if (ifa == NULL)
507 /*
508 * A potential indev allocation can be left alive, it stays
509 * assigned to its device and is destroy with it.
510 */
511 goto errout;
512
513 ipv4_devconf_setall(in_dev);
514 in_dev_hold(in_dev);
515
516 if (tb[IFA_ADDRESS] == NULL)
517 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
518
519 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
520 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
521 ifa->ifa_flags = ifm->ifa_flags;
522 ifa->ifa_scope = ifm->ifa_scope;
523 ifa->ifa_dev = in_dev;
524
525 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
526 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
527
528 if (tb[IFA_BROADCAST])
529 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
530
531 if (tb[IFA_LABEL])
532 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
533 else
534 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
535
536 return ifa;
537
538 errout:
539 return ERR_PTR(err);
540 }
541
542 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
543 {
544 struct net *net = sock_net(skb->sk);
545 struct in_ifaddr *ifa;
546
547 ASSERT_RTNL();
548
549 ifa = rtm_to_ifaddr(net, nlh);
550 if (IS_ERR(ifa))
551 return PTR_ERR(ifa);
552
553 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid);
554 }
555
556 /*
557 * Determine a default network mask, based on the IP address.
558 */
559
560 static __inline__ int inet_abc_len(__be32 addr)
561 {
562 int rc = -1; /* Something else, probably a multicast. */
563
564 if (ipv4_is_zeronet(addr))
565 rc = 0;
566 else {
567 __u32 haddr = ntohl(addr);
568
569 if (IN_CLASSA(haddr))
570 rc = 8;
571 else if (IN_CLASSB(haddr))
572 rc = 16;
573 else if (IN_CLASSC(haddr))
574 rc = 24;
575 }
576
577 return rc;
578 }
579
580
581 int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
582 {
583 struct ifreq ifr;
584 struct sockaddr_in sin_orig;
585 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
586 struct in_device *in_dev;
587 struct in_ifaddr **ifap = NULL;
588 struct in_ifaddr *ifa = NULL;
589 struct net_device *dev;
590 char *colon;
591 int ret = -EFAULT;
592 int tryaddrmatch = 0;
593
594 /*
595 * Fetch the caller's info block into kernel space
596 */
597
598 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
599 goto out;
600 ifr.ifr_name[IFNAMSIZ - 1] = 0;
601
602 /* save original address for comparison */
603 memcpy(&sin_orig, sin, sizeof(*sin));
604
605 colon = strchr(ifr.ifr_name, ':');
606 if (colon)
607 *colon = 0;
608
609 dev_load(net, ifr.ifr_name);
610
611 switch (cmd) {
612 case SIOCGIFADDR: /* Get interface address */
613 case SIOCGIFBRDADDR: /* Get the broadcast address */
614 case SIOCGIFDSTADDR: /* Get the destination address */
615 case SIOCGIFNETMASK: /* Get the netmask for the interface */
616 /* Note that these ioctls will not sleep,
617 so that we do not impose a lock.
618 One day we will be forced to put shlock here (I mean SMP)
619 */
620 tryaddrmatch = (sin_orig.sin_family == AF_INET);
621 memset(sin, 0, sizeof(*sin));
622 sin->sin_family = AF_INET;
623 break;
624
625 case SIOCSIFFLAGS:
626 ret = -EACCES;
627 if (!capable(CAP_NET_ADMIN))
628 goto out;
629 break;
630 case SIOCSIFADDR: /* Set interface address (and family) */
631 case SIOCSIFBRDADDR: /* Set the broadcast address */
632 case SIOCSIFDSTADDR: /* Set the destination address */
633 case SIOCSIFNETMASK: /* Set the netmask for the interface */
634 ret = -EACCES;
635 if (!capable(CAP_NET_ADMIN))
636 goto out;
637 ret = -EINVAL;
638 if (sin->sin_family != AF_INET)
639 goto out;
640 break;
641 default:
642 ret = -EINVAL;
643 goto out;
644 }
645
646 rtnl_lock();
647
648 ret = -ENODEV;
649 if ((dev = __dev_get_by_name(net, ifr.ifr_name)) == NULL)
650 goto done;
651
652 if (colon)
653 *colon = ':';
654
655 if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) {
656 if (tryaddrmatch) {
657 /* Matthias Andree */
658 /* compare label and address (4.4BSD style) */
659 /* note: we only do this for a limited set of ioctls
660 and only if the original address family was AF_INET.
661 This is checked above. */
662 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
663 ifap = &ifa->ifa_next) {
664 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
665 sin_orig.sin_addr.s_addr ==
666 ifa->ifa_address) {
667 break; /* found */
668 }
669 }
670 }
671 /* we didn't get a match, maybe the application is
672 4.3BSD-style and passed in junk so we fall back to
673 comparing just the label */
674 if (!ifa) {
675 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
676 ifap = &ifa->ifa_next)
677 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
678 break;
679 }
680 }
681
682 ret = -EADDRNOTAVAIL;
683 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
684 goto done;
685
686 switch (cmd) {
687 case SIOCGIFADDR: /* Get interface address */
688 sin->sin_addr.s_addr = ifa->ifa_local;
689 goto rarok;
690
691 case SIOCGIFBRDADDR: /* Get the broadcast address */
692 sin->sin_addr.s_addr = ifa->ifa_broadcast;
693 goto rarok;
694
695 case SIOCGIFDSTADDR: /* Get the destination address */
696 sin->sin_addr.s_addr = ifa->ifa_address;
697 goto rarok;
698
699 case SIOCGIFNETMASK: /* Get the netmask for the interface */
700 sin->sin_addr.s_addr = ifa->ifa_mask;
701 goto rarok;
702
703 case SIOCSIFFLAGS:
704 if (colon) {
705 ret = -EADDRNOTAVAIL;
706 if (!ifa)
707 break;
708 ret = 0;
709 if (!(ifr.ifr_flags & IFF_UP))
710 inet_del_ifa(in_dev, ifap, 1);
711 break;
712 }
713 ret = dev_change_flags(dev, ifr.ifr_flags);
714 break;
715
716 case SIOCSIFADDR: /* Set interface address (and family) */
717 ret = -EINVAL;
718 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
719 break;
720
721 if (!ifa) {
722 ret = -ENOBUFS;
723 if ((ifa = inet_alloc_ifa()) == NULL)
724 break;
725 if (colon)
726 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
727 else
728 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
729 } else {
730 ret = 0;
731 if (ifa->ifa_local == sin->sin_addr.s_addr)
732 break;
733 inet_del_ifa(in_dev, ifap, 0);
734 ifa->ifa_broadcast = 0;
735 ifa->ifa_scope = 0;
736 }
737
738 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
739
740 if (!(dev->flags & IFF_POINTOPOINT)) {
741 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
742 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
743 if ((dev->flags & IFF_BROADCAST) &&
744 ifa->ifa_prefixlen < 31)
745 ifa->ifa_broadcast = ifa->ifa_address |
746 ~ifa->ifa_mask;
747 } else {
748 ifa->ifa_prefixlen = 32;
749 ifa->ifa_mask = inet_make_mask(32);
750 }
751 ret = inet_set_ifa(dev, ifa);
752 break;
753
754 case SIOCSIFBRDADDR: /* Set the broadcast address */
755 ret = 0;
756 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
757 inet_del_ifa(in_dev, ifap, 0);
758 ifa->ifa_broadcast = sin->sin_addr.s_addr;
759 inet_insert_ifa(ifa);
760 }
761 break;
762
763 case SIOCSIFDSTADDR: /* Set the destination address */
764 ret = 0;
765 if (ifa->ifa_address == sin->sin_addr.s_addr)
766 break;
767 ret = -EINVAL;
768 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
769 break;
770 ret = 0;
771 inet_del_ifa(in_dev, ifap, 0);
772 ifa->ifa_address = sin->sin_addr.s_addr;
773 inet_insert_ifa(ifa);
774 break;
775
776 case SIOCSIFNETMASK: /* Set the netmask for the interface */
777
778 /*
779 * The mask we set must be legal.
780 */
781 ret = -EINVAL;
782 if (bad_mask(sin->sin_addr.s_addr, 0))
783 break;
784 ret = 0;
785 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
786 __be32 old_mask = ifa->ifa_mask;
787 inet_del_ifa(in_dev, ifap, 0);
788 ifa->ifa_mask = sin->sin_addr.s_addr;
789 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
790
791 /* See if current broadcast address matches
792 * with current netmask, then recalculate
793 * the broadcast address. Otherwise it's a
794 * funny address, so don't touch it since
795 * the user seems to know what (s)he's doing...
796 */
797 if ((dev->flags & IFF_BROADCAST) &&
798 (ifa->ifa_prefixlen < 31) &&
799 (ifa->ifa_broadcast ==
800 (ifa->ifa_local|~old_mask))) {
801 ifa->ifa_broadcast = (ifa->ifa_local |
802 ~sin->sin_addr.s_addr);
803 }
804 inet_insert_ifa(ifa);
805 }
806 break;
807 }
808 done:
809 rtnl_unlock();
810 out:
811 return ret;
812 rarok:
813 rtnl_unlock();
814 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
815 goto out;
816 }
817
818 static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
819 {
820 struct in_device *in_dev = __in_dev_get_rtnl(dev);
821 struct in_ifaddr *ifa;
822 struct ifreq ifr;
823 int done = 0;
824
825 if (!in_dev || (ifa = in_dev->ifa_list) == NULL)
826 goto out;
827
828 for (; ifa; ifa = ifa->ifa_next) {
829 if (!buf) {
830 done += sizeof(ifr);
831 continue;
832 }
833 if (len < (int) sizeof(ifr))
834 break;
835 memset(&ifr, 0, sizeof(struct ifreq));
836 if (ifa->ifa_label)
837 strcpy(ifr.ifr_name, ifa->ifa_label);
838 else
839 strcpy(ifr.ifr_name, dev->name);
840
841 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
842 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
843 ifa->ifa_local;
844
845 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
846 done = -EFAULT;
847 break;
848 }
849 buf += sizeof(struct ifreq);
850 len -= sizeof(struct ifreq);
851 done += sizeof(struct ifreq);
852 }
853 out:
854 return done;
855 }
856
857 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
858 {
859 __be32 addr = 0;
860 struct in_device *in_dev;
861 struct net *net = dev_net(dev);
862
863 rcu_read_lock();
864 in_dev = __in_dev_get_rcu(dev);
865 if (!in_dev)
866 goto no_in_dev;
867
868 for_primary_ifa(in_dev) {
869 if (ifa->ifa_scope > scope)
870 continue;
871 if (!dst || inet_ifa_match(dst, ifa)) {
872 addr = ifa->ifa_local;
873 break;
874 }
875 if (!addr)
876 addr = ifa->ifa_local;
877 } endfor_ifa(in_dev);
878 no_in_dev:
879 rcu_read_unlock();
880
881 if (addr)
882 goto out;
883
884 /* Not loopback addresses on loopback should be preferred
885 in this case. It is importnat that lo is the first interface
886 in dev_base list.
887 */
888 read_lock(&dev_base_lock);
889 rcu_read_lock();
890 for_each_netdev(net, dev) {
891 if ((in_dev = __in_dev_get_rcu(dev)) == NULL)
892 continue;
893
894 for_primary_ifa(in_dev) {
895 if (ifa->ifa_scope != RT_SCOPE_LINK &&
896 ifa->ifa_scope <= scope) {
897 addr = ifa->ifa_local;
898 goto out_unlock_both;
899 }
900 } endfor_ifa(in_dev);
901 }
902 out_unlock_both:
903 read_unlock(&dev_base_lock);
904 rcu_read_unlock();
905 out:
906 return addr;
907 }
908
909 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
910 __be32 local, int scope)
911 {
912 int same = 0;
913 __be32 addr = 0;
914
915 for_ifa(in_dev) {
916 if (!addr &&
917 (local == ifa->ifa_local || !local) &&
918 ifa->ifa_scope <= scope) {
919 addr = ifa->ifa_local;
920 if (same)
921 break;
922 }
923 if (!same) {
924 same = (!local || inet_ifa_match(local, ifa)) &&
925 (!dst || inet_ifa_match(dst, ifa));
926 if (same && addr) {
927 if (local || !dst)
928 break;
929 /* Is the selected addr into dst subnet? */
930 if (inet_ifa_match(addr, ifa))
931 break;
932 /* No, then can we use new local src? */
933 if (ifa->ifa_scope <= scope) {
934 addr = ifa->ifa_local;
935 break;
936 }
937 /* search for large dst subnet for addr */
938 same = 0;
939 }
940 }
941 } endfor_ifa(in_dev);
942
943 return same? addr : 0;
944 }
945
946 /*
947 * Confirm that local IP address exists using wildcards:
948 * - in_dev: only on this interface, 0=any interface
949 * - dst: only in the same subnet as dst, 0=any dst
950 * - local: address, 0=autoselect the local address
951 * - scope: maximum allowed scope value for the local address
952 */
953 __be32 inet_confirm_addr(struct in_device *in_dev,
954 __be32 dst, __be32 local, int scope)
955 {
956 __be32 addr = 0;
957 struct net_device *dev;
958 struct net *net;
959
960 if (scope != RT_SCOPE_LINK)
961 return confirm_addr_indev(in_dev, dst, local, scope);
962
963 net = dev_net(in_dev->dev);
964 read_lock(&dev_base_lock);
965 rcu_read_lock();
966 for_each_netdev(net, dev) {
967 if ((in_dev = __in_dev_get_rcu(dev))) {
968 addr = confirm_addr_indev(in_dev, dst, local, scope);
969 if (addr)
970 break;
971 }
972 }
973 rcu_read_unlock();
974 read_unlock(&dev_base_lock);
975
976 return addr;
977 }
978
979 /*
980 * Device notifier
981 */
982
983 int register_inetaddr_notifier(struct notifier_block *nb)
984 {
985 return blocking_notifier_chain_register(&inetaddr_chain, nb);
986 }
987
988 int unregister_inetaddr_notifier(struct notifier_block *nb)
989 {
990 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
991 }
992
993 /* Rename ifa_labels for a device name change. Make some effort to preserve existing
994 * alias numbering and to create unique labels if possible.
995 */
996 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
997 {
998 struct in_ifaddr *ifa;
999 int named = 0;
1000
1001 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1002 char old[IFNAMSIZ], *dot;
1003
1004 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1005 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1006 if (named++ == 0)
1007 goto skip;
1008 dot = strchr(old, ':');
1009 if (dot == NULL) {
1010 sprintf(old, ":%d", named);
1011 dot = old;
1012 }
1013 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) {
1014 strcat(ifa->ifa_label, dot);
1015 } else {
1016 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1017 }
1018 skip:
1019 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1020 }
1021 }
1022
1023 static inline bool inetdev_valid_mtu(unsigned mtu)
1024 {
1025 return mtu >= 68;
1026 }
1027
1028 /* Called only under RTNL semaphore */
1029
1030 static int inetdev_event(struct notifier_block *this, unsigned long event,
1031 void *ptr)
1032 {
1033 struct net_device *dev = ptr;
1034 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1035
1036 ASSERT_RTNL();
1037
1038 if (!in_dev) {
1039 if (event == NETDEV_REGISTER) {
1040 in_dev = inetdev_init(dev);
1041 if (!in_dev)
1042 return notifier_from_errno(-ENOMEM);
1043 if (dev->flags & IFF_LOOPBACK) {
1044 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1045 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1046 }
1047 } else if (event == NETDEV_CHANGEMTU) {
1048 /* Re-enabling IP */
1049 if (inetdev_valid_mtu(dev->mtu))
1050 in_dev = inetdev_init(dev);
1051 }
1052 goto out;
1053 }
1054
1055 switch (event) {
1056 case NETDEV_REGISTER:
1057 printk(KERN_DEBUG "inetdev_event: bug\n");
1058 dev->ip_ptr = NULL;
1059 break;
1060 case NETDEV_UP:
1061 if (!inetdev_valid_mtu(dev->mtu))
1062 break;
1063 if (dev->flags & IFF_LOOPBACK) {
1064 struct in_ifaddr *ifa;
1065 if ((ifa = inet_alloc_ifa()) != NULL) {
1066 ifa->ifa_local =
1067 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1068 ifa->ifa_prefixlen = 8;
1069 ifa->ifa_mask = inet_make_mask(8);
1070 in_dev_hold(in_dev);
1071 ifa->ifa_dev = in_dev;
1072 ifa->ifa_scope = RT_SCOPE_HOST;
1073 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1074 inet_insert_ifa(ifa);
1075 }
1076 }
1077 ip_mc_up(in_dev);
1078 /* fall through */
1079 case NETDEV_CHANGEADDR:
1080 if (IN_DEV_ARP_NOTIFY(in_dev))
1081 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1082 in_dev->ifa_list->ifa_address,
1083 dev,
1084 in_dev->ifa_list->ifa_address,
1085 NULL, dev->dev_addr, NULL);
1086 break;
1087 case NETDEV_DOWN:
1088 ip_mc_down(in_dev);
1089 break;
1090 case NETDEV_CHANGEMTU:
1091 if (inetdev_valid_mtu(dev->mtu))
1092 break;
1093 /* disable IP when MTU is not enough */
1094 case NETDEV_UNREGISTER:
1095 inetdev_destroy(in_dev);
1096 break;
1097 case NETDEV_CHANGENAME:
1098 /* Do not notify about label change, this event is
1099 * not interesting to applications using netlink.
1100 */
1101 inetdev_changename(dev, in_dev);
1102
1103 devinet_sysctl_unregister(in_dev);
1104 devinet_sysctl_register(in_dev);
1105 break;
1106 }
1107 out:
1108 return NOTIFY_DONE;
1109 }
1110
1111 static struct notifier_block ip_netdev_notifier = {
1112 .notifier_call = inetdev_event,
1113 };
1114
1115 static inline size_t inet_nlmsg_size(void)
1116 {
1117 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1118 + nla_total_size(4) /* IFA_ADDRESS */
1119 + nla_total_size(4) /* IFA_LOCAL */
1120 + nla_total_size(4) /* IFA_BROADCAST */
1121 + nla_total_size(IFNAMSIZ); /* IFA_LABEL */
1122 }
1123
1124 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1125 u32 pid, u32 seq, int event, unsigned int flags)
1126 {
1127 struct ifaddrmsg *ifm;
1128 struct nlmsghdr *nlh;
1129
1130 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
1131 if (nlh == NULL)
1132 return -EMSGSIZE;
1133
1134 ifm = nlmsg_data(nlh);
1135 ifm->ifa_family = AF_INET;
1136 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1137 ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
1138 ifm->ifa_scope = ifa->ifa_scope;
1139 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1140
1141 if (ifa->ifa_address)
1142 NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address);
1143
1144 if (ifa->ifa_local)
1145 NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local);
1146
1147 if (ifa->ifa_broadcast)
1148 NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast);
1149
1150 if (ifa->ifa_label[0])
1151 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
1152
1153 return nlmsg_end(skb, nlh);
1154
1155 nla_put_failure:
1156 nlmsg_cancel(skb, nlh);
1157 return -EMSGSIZE;
1158 }
1159
1160 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1161 {
1162 struct net *net = sock_net(skb->sk);
1163 int idx, ip_idx;
1164 struct net_device *dev;
1165 struct in_device *in_dev;
1166 struct in_ifaddr *ifa;
1167 int s_ip_idx, s_idx = cb->args[0];
1168
1169 s_ip_idx = ip_idx = cb->args[1];
1170 idx = 0;
1171 for_each_netdev(net, dev) {
1172 if (idx < s_idx)
1173 goto cont;
1174 if (idx > s_idx)
1175 s_ip_idx = 0;
1176 if ((in_dev = __in_dev_get_rtnl(dev)) == NULL)
1177 goto cont;
1178
1179 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1180 ifa = ifa->ifa_next, ip_idx++) {
1181 if (ip_idx < s_ip_idx)
1182 continue;
1183 if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
1184 cb->nlh->nlmsg_seq,
1185 RTM_NEWADDR, NLM_F_MULTI) <= 0)
1186 goto done;
1187 }
1188 cont:
1189 idx++;
1190 }
1191
1192 done:
1193 cb->args[0] = idx;
1194 cb->args[1] = ip_idx;
1195
1196 return skb->len;
1197 }
1198
1199 static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1200 u32 pid)
1201 {
1202 struct sk_buff *skb;
1203 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1204 int err = -ENOBUFS;
1205 struct net *net;
1206
1207 net = dev_net(ifa->ifa_dev->dev);
1208 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1209 if (skb == NULL)
1210 goto errout;
1211
1212 err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0);
1213 if (err < 0) {
1214 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1215 WARN_ON(err == -EMSGSIZE);
1216 kfree_skb(skb);
1217 goto errout;
1218 }
1219 rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1220 return;
1221 errout:
1222 if (err < 0)
1223 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1224 }
1225
1226 #ifdef CONFIG_SYSCTL
1227
1228 static void devinet_copy_dflt_conf(struct net *net, int i)
1229 {
1230 struct net_device *dev;
1231
1232 read_lock(&dev_base_lock);
1233 for_each_netdev(net, dev) {
1234 struct in_device *in_dev;
1235 rcu_read_lock();
1236 in_dev = __in_dev_get_rcu(dev);
1237 if (in_dev && !test_bit(i, in_dev->cnf.state))
1238 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
1239 rcu_read_unlock();
1240 }
1241 read_unlock(&dev_base_lock);
1242 }
1243
1244 static void inet_forward_change(struct net *net)
1245 {
1246 struct net_device *dev;
1247 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
1248
1249 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
1250 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
1251
1252 read_lock(&dev_base_lock);
1253 for_each_netdev(net, dev) {
1254 struct in_device *in_dev;
1255 if (on)
1256 dev_disable_lro(dev);
1257 rcu_read_lock();
1258 in_dev = __in_dev_get_rcu(dev);
1259 if (in_dev)
1260 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
1261 rcu_read_unlock();
1262 }
1263 read_unlock(&dev_base_lock);
1264 }
1265
1266 static int devinet_conf_proc(ctl_table *ctl, int write,
1267 struct file *filp, void __user *buffer,
1268 size_t *lenp, loff_t *ppos)
1269 {
1270 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1271
1272 if (write) {
1273 struct ipv4_devconf *cnf = ctl->extra1;
1274 struct net *net = ctl->extra2;
1275 int i = (int *)ctl->data - cnf->data;
1276
1277 set_bit(i, cnf->state);
1278
1279 if (cnf == net->ipv4.devconf_dflt)
1280 devinet_copy_dflt_conf(net, i);
1281 }
1282
1283 return ret;
1284 }
1285
1286 static int devinet_conf_sysctl(ctl_table *table,
1287 void __user *oldval, size_t __user *oldlenp,
1288 void __user *newval, size_t newlen)
1289 {
1290 struct ipv4_devconf *cnf;
1291 struct net *net;
1292 int *valp = table->data;
1293 int new;
1294 int i;
1295
1296 if (!newval || !newlen)
1297 return 0;
1298
1299 if (newlen != sizeof(int))
1300 return -EINVAL;
1301
1302 if (get_user(new, (int __user *)newval))
1303 return -EFAULT;
1304
1305 if (new == *valp)
1306 return 0;
1307
1308 if (oldval && oldlenp) {
1309 size_t len;
1310
1311 if (get_user(len, oldlenp))
1312 return -EFAULT;
1313
1314 if (len) {
1315 if (len > table->maxlen)
1316 len = table->maxlen;
1317 if (copy_to_user(oldval, valp, len))
1318 return -EFAULT;
1319 if (put_user(len, oldlenp))
1320 return -EFAULT;
1321 }
1322 }
1323
1324 *valp = new;
1325
1326 cnf = table->extra1;
1327 net = table->extra2;
1328 i = (int *)table->data - cnf->data;
1329
1330 set_bit(i, cnf->state);
1331
1332 if (cnf == net->ipv4.devconf_dflt)
1333 devinet_copy_dflt_conf(net, i);
1334
1335 return 1;
1336 }
1337
1338 static int devinet_sysctl_forward(ctl_table *ctl, int write,
1339 struct file *filp, void __user *buffer,
1340 size_t *lenp, loff_t *ppos)
1341 {
1342 int *valp = ctl->data;
1343 int val = *valp;
1344 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1345
1346 if (write && *valp != val) {
1347 struct net *net = ctl->extra2;
1348
1349 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
1350 if (!rtnl_trylock())
1351 return restart_syscall();
1352 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
1353 inet_forward_change(net);
1354 } else if (*valp) {
1355 struct ipv4_devconf *cnf = ctl->extra1;
1356 struct in_device *idev =
1357 container_of(cnf, struct in_device, cnf);
1358 dev_disable_lro(idev->dev);
1359 }
1360 rtnl_unlock();
1361 rt_cache_flush(net, 0);
1362 }
1363 }
1364
1365 return ret;
1366 }
1367
1368 int ipv4_doint_and_flush(ctl_table *ctl, int write,
1369 struct file *filp, void __user *buffer,
1370 size_t *lenp, loff_t *ppos)
1371 {
1372 int *valp = ctl->data;
1373 int val = *valp;
1374 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1375 struct net *net = ctl->extra2;
1376
1377 if (write && *valp != val)
1378 rt_cache_flush(net, 0);
1379
1380 return ret;
1381 }
1382
1383 int ipv4_doint_and_flush_strategy(ctl_table *table,
1384 void __user *oldval, size_t __user *oldlenp,
1385 void __user *newval, size_t newlen)
1386 {
1387 int ret = devinet_conf_sysctl(table, oldval, oldlenp, newval, newlen);
1388 struct net *net = table->extra2;
1389
1390 if (ret == 1)
1391 rt_cache_flush(net, 0);
1392
1393 return ret;
1394 }
1395
1396
1397 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc, sysctl) \
1398 { \
1399 .ctl_name = NET_IPV4_CONF_ ## attr, \
1400 .procname = name, \
1401 .data = ipv4_devconf.data + \
1402 NET_IPV4_CONF_ ## attr - 1, \
1403 .maxlen = sizeof(int), \
1404 .mode = mval, \
1405 .proc_handler = proc, \
1406 .strategy = sysctl, \
1407 .extra1 = &ipv4_devconf, \
1408 }
1409
1410 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
1411 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc, \
1412 devinet_conf_sysctl)
1413
1414 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
1415 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc, \
1416 devinet_conf_sysctl)
1417
1418 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc, sysctl) \
1419 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc, sysctl)
1420
1421 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
1422 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush, \
1423 ipv4_doint_and_flush_strategy)
1424
1425 static struct devinet_sysctl_table {
1426 struct ctl_table_header *sysctl_header;
1427 struct ctl_table devinet_vars[__NET_IPV4_CONF_MAX];
1428 char *dev_name;
1429 } devinet_sysctl = {
1430 .devinet_vars = {
1431 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
1432 devinet_sysctl_forward,
1433 devinet_conf_sysctl),
1434 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
1435
1436 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
1437 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
1438 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
1439 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
1440 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
1441 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
1442 "accept_source_route"),
1443 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
1444 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
1445 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
1446 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
1447 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
1448 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
1449 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
1450 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
1451 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
1452 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
1453
1454 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
1455 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
1456 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
1457 "force_igmp_version"),
1458 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
1459 "promote_secondaries"),
1460 },
1461 };
1462
1463 static int __devinet_sysctl_register(struct net *net, char *dev_name,
1464 int ctl_name, struct ipv4_devconf *p)
1465 {
1466 int i;
1467 struct devinet_sysctl_table *t;
1468
1469 #define DEVINET_CTL_PATH_DEV 3
1470
1471 struct ctl_path devinet_ctl_path[] = {
1472 { .procname = "net", .ctl_name = CTL_NET, },
1473 { .procname = "ipv4", .ctl_name = NET_IPV4, },
1474 { .procname = "conf", .ctl_name = NET_IPV4_CONF, },
1475 { /* to be set */ },
1476 { },
1477 };
1478
1479 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1480 if (!t)
1481 goto out;
1482
1483 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
1484 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
1485 t->devinet_vars[i].extra1 = p;
1486 t->devinet_vars[i].extra2 = net;
1487 }
1488
1489 /*
1490 * Make a copy of dev_name, because '.procname' is regarded as const
1491 * by sysctl and we wouldn't want anyone to change it under our feet
1492 * (see SIOCSIFNAME).
1493 */
1494 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
1495 if (!t->dev_name)
1496 goto free;
1497
1498 devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name;
1499 devinet_ctl_path[DEVINET_CTL_PATH_DEV].ctl_name = ctl_name;
1500
1501 t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path,
1502 t->devinet_vars);
1503 if (!t->sysctl_header)
1504 goto free_procname;
1505
1506 p->sysctl = t;
1507 return 0;
1508
1509 free_procname:
1510 kfree(t->dev_name);
1511 free:
1512 kfree(t);
1513 out:
1514 return -ENOBUFS;
1515 }
1516
1517 static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
1518 {
1519 struct devinet_sysctl_table *t = cnf->sysctl;
1520
1521 if (t == NULL)
1522 return;
1523
1524 cnf->sysctl = NULL;
1525 unregister_sysctl_table(t->sysctl_header);
1526 kfree(t->dev_name);
1527 kfree(t);
1528 }
1529
1530 static void devinet_sysctl_register(struct in_device *idev)
1531 {
1532 neigh_sysctl_register(idev->dev, idev->arp_parms, NET_IPV4,
1533 NET_IPV4_NEIGH, "ipv4", NULL, NULL);
1534 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
1535 idev->dev->ifindex, &idev->cnf);
1536 }
1537
1538 static void devinet_sysctl_unregister(struct in_device *idev)
1539 {
1540 __devinet_sysctl_unregister(&idev->cnf);
1541 neigh_sysctl_unregister(idev->arp_parms);
1542 }
1543
1544 static struct ctl_table ctl_forward_entry[] = {
1545 {
1546 .ctl_name = NET_IPV4_FORWARD,
1547 .procname = "ip_forward",
1548 .data = &ipv4_devconf.data[
1549 NET_IPV4_CONF_FORWARDING - 1],
1550 .maxlen = sizeof(int),
1551 .mode = 0644,
1552 .proc_handler = devinet_sysctl_forward,
1553 .strategy = devinet_conf_sysctl,
1554 .extra1 = &ipv4_devconf,
1555 .extra2 = &init_net,
1556 },
1557 { },
1558 };
1559
1560 static __net_initdata struct ctl_path net_ipv4_path[] = {
1561 { .procname = "net", .ctl_name = CTL_NET, },
1562 { .procname = "ipv4", .ctl_name = NET_IPV4, },
1563 { },
1564 };
1565 #endif
1566
1567 static __net_init int devinet_init_net(struct net *net)
1568 {
1569 int err;
1570 struct ipv4_devconf *all, *dflt;
1571 #ifdef CONFIG_SYSCTL
1572 struct ctl_table *tbl = ctl_forward_entry;
1573 struct ctl_table_header *forw_hdr;
1574 #endif
1575
1576 err = -ENOMEM;
1577 all = &ipv4_devconf;
1578 dflt = &ipv4_devconf_dflt;
1579
1580 if (net != &init_net) {
1581 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
1582 if (all == NULL)
1583 goto err_alloc_all;
1584
1585 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
1586 if (dflt == NULL)
1587 goto err_alloc_dflt;
1588
1589 #ifdef CONFIG_SYSCTL
1590 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
1591 if (tbl == NULL)
1592 goto err_alloc_ctl;
1593
1594 tbl[0].data = &all->data[NET_IPV4_CONF_FORWARDING - 1];
1595 tbl[0].extra1 = all;
1596 tbl[0].extra2 = net;
1597 #endif
1598 }
1599
1600 #ifdef CONFIG_SYSCTL
1601 err = __devinet_sysctl_register(net, "all",
1602 NET_PROTO_CONF_ALL, all);
1603 if (err < 0)
1604 goto err_reg_all;
1605
1606 err = __devinet_sysctl_register(net, "default",
1607 NET_PROTO_CONF_DEFAULT, dflt);
1608 if (err < 0)
1609 goto err_reg_dflt;
1610
1611 err = -ENOMEM;
1612 forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl);
1613 if (forw_hdr == NULL)
1614 goto err_reg_ctl;
1615 net->ipv4.forw_hdr = forw_hdr;
1616 #endif
1617
1618 net->ipv4.devconf_all = all;
1619 net->ipv4.devconf_dflt = dflt;
1620 return 0;
1621
1622 #ifdef CONFIG_SYSCTL
1623 err_reg_ctl:
1624 __devinet_sysctl_unregister(dflt);
1625 err_reg_dflt:
1626 __devinet_sysctl_unregister(all);
1627 err_reg_all:
1628 if (tbl != ctl_forward_entry)
1629 kfree(tbl);
1630 err_alloc_ctl:
1631 #endif
1632 if (dflt != &ipv4_devconf_dflt)
1633 kfree(dflt);
1634 err_alloc_dflt:
1635 if (all != &ipv4_devconf)
1636 kfree(all);
1637 err_alloc_all:
1638 return err;
1639 }
1640
1641 static __net_exit void devinet_exit_net(struct net *net)
1642 {
1643 #ifdef CONFIG_SYSCTL
1644 struct ctl_table *tbl;
1645
1646 tbl = net->ipv4.forw_hdr->ctl_table_arg;
1647 unregister_net_sysctl_table(net->ipv4.forw_hdr);
1648 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
1649 __devinet_sysctl_unregister(net->ipv4.devconf_all);
1650 kfree(tbl);
1651 #endif
1652 kfree(net->ipv4.devconf_dflt);
1653 kfree(net->ipv4.devconf_all);
1654 }
1655
1656 static __net_initdata struct pernet_operations devinet_ops = {
1657 .init = devinet_init_net,
1658 .exit = devinet_exit_net,
1659 };
1660
1661 void __init devinet_init(void)
1662 {
1663 register_pernet_subsys(&devinet_ops);
1664
1665 register_gifconf(PF_INET, inet_gifconf);
1666 register_netdevice_notifier(&ip_netdev_notifier);
1667
1668 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL);
1669 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL);
1670 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr);
1671 }
1672
1673 EXPORT_SYMBOL(in_dev_finish_destroy);
1674 EXPORT_SYMBOL(inet_select_addr);
1675 EXPORT_SYMBOL(inetdev_by_index);
1676 EXPORT_SYMBOL(register_inetaddr_notifier);
1677 EXPORT_SYMBOL(unregister_inetaddr_notifier);
1678
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