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[deliverable/linux.git] / net / ipv4 / devinet.c
1 /*
2 * NET3 IP device support routines.
3 *
4 * Version: $Id: devinet.c,v 1.44 2001/10/31 21:55:54 davem Exp $
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 * Derived from the IP parts of dev.c 1.0.19
12 * Authors: Ross Biro
13 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
14 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 *
16 * Additional Authors:
17 * Alan Cox, <gw4pts@gw4pts.ampr.org>
18 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
19 *
20 * Changes:
21 * Alexey Kuznetsov: pa_* fields are replaced with ifaddr
22 * lists.
23 * Cyrus Durgin: updated for kmod
24 * Matthias Andree: in devinet_ioctl, compare label and
25 * address (4.4BSD alias style support),
26 * fall back to comparing just the label
27 * if no match found.
28 */
29
30
31 #include <asm/uaccess.h>
32 #include <asm/system.h>
33 #include <linux/bitops.h>
34 #include <linux/capability.h>
35 #include <linux/module.h>
36 #include <linux/types.h>
37 #include <linux/kernel.h>
38 #include <linux/string.h>
39 #include <linux/mm.h>
40 #include <linux/socket.h>
41 #include <linux/sockios.h>
42 #include <linux/in.h>
43 #include <linux/errno.h>
44 #include <linux/interrupt.h>
45 #include <linux/if_addr.h>
46 #include <linux/if_ether.h>
47 #include <linux/inet.h>
48 #include <linux/netdevice.h>
49 #include <linux/etherdevice.h>
50 #include <linux/skbuff.h>
51 #include <linux/init.h>
52 #include <linux/notifier.h>
53 #include <linux/inetdevice.h>
54 #include <linux/igmp.h>
55 #ifdef CONFIG_SYSCTL
56 #include <linux/sysctl.h>
57 #endif
58 #include <linux/kmod.h>
59
60 #include <net/arp.h>
61 #include <net/ip.h>
62 #include <net/route.h>
63 #include <net/ip_fib.h>
64 #include <net/rtnetlink.h>
65
66 struct ipv4_devconf ipv4_devconf = {
67 .data = {
68 [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1,
69 [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1,
70 [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1,
71 [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1,
72 },
73 };
74
75 static struct ipv4_devconf ipv4_devconf_dflt = {
76 .data = {
77 [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1,
78 [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1,
79 [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1,
80 [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1,
81 [NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
82 },
83 };
84
85 #define IPV4_DEVCONF_DFLT(attr) IPV4_DEVCONF(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_ANYCAST] = { .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 *in_dev,
102 struct ipv4_devconf *p);
103 static void devinet_sysctl_unregister(struct ipv4_devconf *p);
104 #endif
105
106 /* Locks all the inet devices. */
107
108 static struct in_ifaddr *inet_alloc_ifa(void)
109 {
110 struct in_ifaddr *ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
111
112 if (ifa) {
113 INIT_RCU_HEAD(&ifa->rcu_head);
114 }
115
116 return ifa;
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 BUG_TRAP(!idev->ifa_list);
137 BUG_TRAP(!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 printk("Freeing alive in_device %p\n", idev);
145 else {
146 kfree(idev);
147 }
148 }
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 INIT_RCU_HEAD(&in_dev->rcu_head);
160 memcpy(&in_dev->cnf, &ipv4_devconf_dflt, sizeof(in_dev->cnf));
161 in_dev->cnf.sysctl = NULL;
162 in_dev->dev = dev;
163 if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL)
164 goto out_kfree;
165 /* Reference in_dev->dev */
166 dev_hold(dev);
167 #ifdef CONFIG_SYSCTL
168 neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4,
169 NET_IPV4_NEIGH, "ipv4", NULL, NULL);
170 #endif
171
172 /* Account for reference dev->ip_ptr (below) */
173 in_dev_hold(in_dev);
174
175 #ifdef CONFIG_SYSCTL
176 devinet_sysctl_register(in_dev, &in_dev->cnf);
177 #endif
178 ip_mc_init_dev(in_dev);
179 if (dev->flags & IFF_UP)
180 ip_mc_up(in_dev);
181
182 /* we can receive as soon as ip_ptr is set -- do this last */
183 rcu_assign_pointer(dev->ip_ptr, in_dev);
184 out:
185 return in_dev;
186 out_kfree:
187 kfree(in_dev);
188 in_dev = NULL;
189 goto out;
190 }
191
192 static void in_dev_rcu_put(struct rcu_head *head)
193 {
194 struct in_device *idev = container_of(head, struct in_device, rcu_head);
195 in_dev_put(idev);
196 }
197
198 static void inetdev_destroy(struct in_device *in_dev)
199 {
200 struct in_ifaddr *ifa;
201 struct net_device *dev;
202
203 ASSERT_RTNL();
204
205 dev = in_dev->dev;
206 if (dev == &loopback_dev)
207 return;
208
209 in_dev->dead = 1;
210
211 ip_mc_destroy_dev(in_dev);
212
213 while ((ifa = in_dev->ifa_list) != NULL) {
214 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
215 inet_free_ifa(ifa);
216 }
217
218 #ifdef CONFIG_SYSCTL
219 devinet_sysctl_unregister(&in_dev->cnf);
220 #endif
221
222 dev->ip_ptr = NULL;
223
224 #ifdef CONFIG_SYSCTL
225 neigh_sysctl_unregister(in_dev->arp_parms);
226 #endif
227 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
228 arp_ifdown(dev);
229
230 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
231 }
232
233 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
234 {
235 rcu_read_lock();
236 for_primary_ifa(in_dev) {
237 if (inet_ifa_match(a, ifa)) {
238 if (!b || inet_ifa_match(b, ifa)) {
239 rcu_read_unlock();
240 return 1;
241 }
242 }
243 } endfor_ifa(in_dev);
244 rcu_read_unlock();
245 return 0;
246 }
247
248 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
249 int destroy, struct nlmsghdr *nlh, u32 pid)
250 {
251 struct in_ifaddr *promote = NULL;
252 struct in_ifaddr *ifa, *ifa1 = *ifap;
253 struct in_ifaddr *last_prim = in_dev->ifa_list;
254 struct in_ifaddr *prev_prom = NULL;
255 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
256
257 ASSERT_RTNL();
258
259 /* 1. Deleting primary ifaddr forces deletion all secondaries
260 * unless alias promotion is set
261 **/
262
263 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
264 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
265
266 while ((ifa = *ifap1) != NULL) {
267 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
268 ifa1->ifa_scope <= ifa->ifa_scope)
269 last_prim = ifa;
270
271 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
272 ifa1->ifa_mask != ifa->ifa_mask ||
273 !inet_ifa_match(ifa1->ifa_address, ifa)) {
274 ifap1 = &ifa->ifa_next;
275 prev_prom = ifa;
276 continue;
277 }
278
279 if (!do_promote) {
280 *ifap1 = ifa->ifa_next;
281
282 rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid);
283 blocking_notifier_call_chain(&inetaddr_chain,
284 NETDEV_DOWN, ifa);
285 inet_free_ifa(ifa);
286 } else {
287 promote = ifa;
288 break;
289 }
290 }
291 }
292
293 /* 2. Unlink it */
294
295 *ifap = ifa1->ifa_next;
296
297 /* 3. Announce address deletion */
298
299 /* Send message first, then call notifier.
300 At first sight, FIB update triggered by notifier
301 will refer to already deleted ifaddr, that could confuse
302 netlink listeners. It is not true: look, gated sees
303 that route deleted and if it still thinks that ifaddr
304 is valid, it will try to restore deleted routes... Grr.
305 So that, this order is correct.
306 */
307 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid);
308 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
309
310 if (promote) {
311
312 if (prev_prom) {
313 prev_prom->ifa_next = promote->ifa_next;
314 promote->ifa_next = last_prim->ifa_next;
315 last_prim->ifa_next = promote;
316 }
317
318 promote->ifa_flags &= ~IFA_F_SECONDARY;
319 rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid);
320 blocking_notifier_call_chain(&inetaddr_chain,
321 NETDEV_UP, promote);
322 for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) {
323 if (ifa1->ifa_mask != ifa->ifa_mask ||
324 !inet_ifa_match(ifa1->ifa_address, ifa))
325 continue;
326 fib_add_ifaddr(ifa);
327 }
328
329 }
330 if (destroy)
331 inet_free_ifa(ifa1);
332 }
333
334 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
335 int destroy)
336 {
337 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
338 }
339
340 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
341 u32 pid)
342 {
343 struct in_device *in_dev = ifa->ifa_dev;
344 struct in_ifaddr *ifa1, **ifap, **last_primary;
345
346 ASSERT_RTNL();
347
348 if (!ifa->ifa_local) {
349 inet_free_ifa(ifa);
350 return 0;
351 }
352
353 ifa->ifa_flags &= ~IFA_F_SECONDARY;
354 last_primary = &in_dev->ifa_list;
355
356 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
357 ifap = &ifa1->ifa_next) {
358 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
359 ifa->ifa_scope <= ifa1->ifa_scope)
360 last_primary = &ifa1->ifa_next;
361 if (ifa1->ifa_mask == ifa->ifa_mask &&
362 inet_ifa_match(ifa1->ifa_address, ifa)) {
363 if (ifa1->ifa_local == ifa->ifa_local) {
364 inet_free_ifa(ifa);
365 return -EEXIST;
366 }
367 if (ifa1->ifa_scope != ifa->ifa_scope) {
368 inet_free_ifa(ifa);
369 return -EINVAL;
370 }
371 ifa->ifa_flags |= IFA_F_SECONDARY;
372 }
373 }
374
375 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
376 net_srandom(ifa->ifa_local);
377 ifap = last_primary;
378 }
379
380 ifa->ifa_next = *ifap;
381 *ifap = ifa;
382
383 /* Send message first, then call notifier.
384 Notifier will trigger FIB update, so that
385 listeners of netlink will know about new ifaddr */
386 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid);
387 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
388
389 return 0;
390 }
391
392 static int inet_insert_ifa(struct in_ifaddr *ifa)
393 {
394 return __inet_insert_ifa(ifa, NULL, 0);
395 }
396
397 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
398 {
399 struct in_device *in_dev = __in_dev_get_rtnl(dev);
400
401 ASSERT_RTNL();
402
403 if (!in_dev) {
404 inet_free_ifa(ifa);
405 return -ENOBUFS;
406 }
407 ipv4_devconf_setall(in_dev);
408 if (ifa->ifa_dev != in_dev) {
409 BUG_TRAP(!ifa->ifa_dev);
410 in_dev_hold(in_dev);
411 ifa->ifa_dev = in_dev;
412 }
413 if (LOOPBACK(ifa->ifa_local))
414 ifa->ifa_scope = RT_SCOPE_HOST;
415 return inet_insert_ifa(ifa);
416 }
417
418 struct in_device *inetdev_by_index(int ifindex)
419 {
420 struct net_device *dev;
421 struct in_device *in_dev = NULL;
422 read_lock(&dev_base_lock);
423 dev = __dev_get_by_index(ifindex);
424 if (dev)
425 in_dev = in_dev_get(dev);
426 read_unlock(&dev_base_lock);
427 return in_dev;
428 }
429
430 /* Called only from RTNL semaphored context. No locks. */
431
432 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
433 __be32 mask)
434 {
435 ASSERT_RTNL();
436
437 for_primary_ifa(in_dev) {
438 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
439 return ifa;
440 } endfor_ifa(in_dev);
441 return NULL;
442 }
443
444 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
445 {
446 struct nlattr *tb[IFA_MAX+1];
447 struct in_device *in_dev;
448 struct ifaddrmsg *ifm;
449 struct in_ifaddr *ifa, **ifap;
450 int err = -EINVAL;
451
452 ASSERT_RTNL();
453
454 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
455 if (err < 0)
456 goto errout;
457
458 ifm = nlmsg_data(nlh);
459 in_dev = inetdev_by_index(ifm->ifa_index);
460 if (in_dev == NULL) {
461 err = -ENODEV;
462 goto errout;
463 }
464
465 __in_dev_put(in_dev);
466
467 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
468 ifap = &ifa->ifa_next) {
469 if (tb[IFA_LOCAL] &&
470 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
471 continue;
472
473 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
474 continue;
475
476 if (tb[IFA_ADDRESS] &&
477 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
478 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
479 continue;
480
481 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid);
482 return 0;
483 }
484
485 err = -EADDRNOTAVAIL;
486 errout:
487 return err;
488 }
489
490 static struct in_ifaddr *rtm_to_ifaddr(struct nlmsghdr *nlh)
491 {
492 struct nlattr *tb[IFA_MAX+1];
493 struct in_ifaddr *ifa;
494 struct ifaddrmsg *ifm;
495 struct net_device *dev;
496 struct in_device *in_dev;
497 int err = -EINVAL;
498
499 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
500 if (err < 0)
501 goto errout;
502
503 ifm = nlmsg_data(nlh);
504 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) {
505 err = -EINVAL;
506 goto errout;
507 }
508
509 dev = __dev_get_by_index(ifm->ifa_index);
510 if (dev == NULL) {
511 err = -ENODEV;
512 goto errout;
513 }
514
515 in_dev = __in_dev_get_rtnl(dev);
516 if (in_dev == NULL) {
517 err = -ENOBUFS;
518 goto errout;
519 }
520
521 ipv4_devconf_setall(in_dev);
522
523 ifa = inet_alloc_ifa();
524 if (ifa == NULL) {
525 /*
526 * A potential indev allocation can be left alive, it stays
527 * assigned to its device and is destroy with it.
528 */
529 err = -ENOBUFS;
530 goto errout;
531 }
532
533 in_dev_hold(in_dev);
534
535 if (tb[IFA_ADDRESS] == NULL)
536 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
537
538 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
539 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
540 ifa->ifa_flags = ifm->ifa_flags;
541 ifa->ifa_scope = ifm->ifa_scope;
542 ifa->ifa_dev = in_dev;
543
544 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
545 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
546
547 if (tb[IFA_BROADCAST])
548 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
549
550 if (tb[IFA_ANYCAST])
551 ifa->ifa_anycast = nla_get_be32(tb[IFA_ANYCAST]);
552
553 if (tb[IFA_LABEL])
554 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
555 else
556 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
557
558 return ifa;
559
560 errout:
561 return ERR_PTR(err);
562 }
563
564 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
565 {
566 struct in_ifaddr *ifa;
567
568 ASSERT_RTNL();
569
570 ifa = rtm_to_ifaddr(nlh);
571 if (IS_ERR(ifa))
572 return PTR_ERR(ifa);
573
574 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid);
575 }
576
577 /*
578 * Determine a default network mask, based on the IP address.
579 */
580
581 static __inline__ int inet_abc_len(__be32 addr)
582 {
583 int rc = -1; /* Something else, probably a multicast. */
584
585 if (ZERONET(addr))
586 rc = 0;
587 else {
588 __u32 haddr = ntohl(addr);
589
590 if (IN_CLASSA(haddr))
591 rc = 8;
592 else if (IN_CLASSB(haddr))
593 rc = 16;
594 else if (IN_CLASSC(haddr))
595 rc = 24;
596 }
597
598 return rc;
599 }
600
601
602 int devinet_ioctl(unsigned int cmd, void __user *arg)
603 {
604 struct ifreq ifr;
605 struct sockaddr_in sin_orig;
606 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
607 struct in_device *in_dev;
608 struct in_ifaddr **ifap = NULL;
609 struct in_ifaddr *ifa = NULL;
610 struct net_device *dev;
611 char *colon;
612 int ret = -EFAULT;
613 int tryaddrmatch = 0;
614
615 /*
616 * Fetch the caller's info block into kernel space
617 */
618
619 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
620 goto out;
621 ifr.ifr_name[IFNAMSIZ - 1] = 0;
622
623 /* save original address for comparison */
624 memcpy(&sin_orig, sin, sizeof(*sin));
625
626 colon = strchr(ifr.ifr_name, ':');
627 if (colon)
628 *colon = 0;
629
630 #ifdef CONFIG_KMOD
631 dev_load(ifr.ifr_name);
632 #endif
633
634 switch (cmd) {
635 case SIOCGIFADDR: /* Get interface address */
636 case SIOCGIFBRDADDR: /* Get the broadcast address */
637 case SIOCGIFDSTADDR: /* Get the destination address */
638 case SIOCGIFNETMASK: /* Get the netmask for the interface */
639 /* Note that these ioctls will not sleep,
640 so that we do not impose a lock.
641 One day we will be forced to put shlock here (I mean SMP)
642 */
643 tryaddrmatch = (sin_orig.sin_family == AF_INET);
644 memset(sin, 0, sizeof(*sin));
645 sin->sin_family = AF_INET;
646 break;
647
648 case SIOCSIFFLAGS:
649 ret = -EACCES;
650 if (!capable(CAP_NET_ADMIN))
651 goto out;
652 break;
653 case SIOCSIFADDR: /* Set interface address (and family) */
654 case SIOCSIFBRDADDR: /* Set the broadcast address */
655 case SIOCSIFDSTADDR: /* Set the destination address */
656 case SIOCSIFNETMASK: /* Set the netmask for the interface */
657 ret = -EACCES;
658 if (!capable(CAP_NET_ADMIN))
659 goto out;
660 ret = -EINVAL;
661 if (sin->sin_family != AF_INET)
662 goto out;
663 break;
664 default:
665 ret = -EINVAL;
666 goto out;
667 }
668
669 rtnl_lock();
670
671 ret = -ENODEV;
672 if ((dev = __dev_get_by_name(ifr.ifr_name)) == NULL)
673 goto done;
674
675 if (colon)
676 *colon = ':';
677
678 if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) {
679 if (tryaddrmatch) {
680 /* Matthias Andree */
681 /* compare label and address (4.4BSD style) */
682 /* note: we only do this for a limited set of ioctls
683 and only if the original address family was AF_INET.
684 This is checked above. */
685 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
686 ifap = &ifa->ifa_next) {
687 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
688 sin_orig.sin_addr.s_addr ==
689 ifa->ifa_address) {
690 break; /* found */
691 }
692 }
693 }
694 /* we didn't get a match, maybe the application is
695 4.3BSD-style and passed in junk so we fall back to
696 comparing just the label */
697 if (!ifa) {
698 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
699 ifap = &ifa->ifa_next)
700 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
701 break;
702 }
703 }
704
705 ret = -EADDRNOTAVAIL;
706 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
707 goto done;
708
709 switch (cmd) {
710 case SIOCGIFADDR: /* Get interface address */
711 sin->sin_addr.s_addr = ifa->ifa_local;
712 goto rarok;
713
714 case SIOCGIFBRDADDR: /* Get the broadcast address */
715 sin->sin_addr.s_addr = ifa->ifa_broadcast;
716 goto rarok;
717
718 case SIOCGIFDSTADDR: /* Get the destination address */
719 sin->sin_addr.s_addr = ifa->ifa_address;
720 goto rarok;
721
722 case SIOCGIFNETMASK: /* Get the netmask for the interface */
723 sin->sin_addr.s_addr = ifa->ifa_mask;
724 goto rarok;
725
726 case SIOCSIFFLAGS:
727 if (colon) {
728 ret = -EADDRNOTAVAIL;
729 if (!ifa)
730 break;
731 ret = 0;
732 if (!(ifr.ifr_flags & IFF_UP))
733 inet_del_ifa(in_dev, ifap, 1);
734 break;
735 }
736 ret = dev_change_flags(dev, ifr.ifr_flags);
737 break;
738
739 case SIOCSIFADDR: /* Set interface address (and family) */
740 ret = -EINVAL;
741 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
742 break;
743
744 if (!ifa) {
745 ret = -ENOBUFS;
746 if ((ifa = inet_alloc_ifa()) == NULL)
747 break;
748 if (colon)
749 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
750 else
751 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
752 } else {
753 ret = 0;
754 if (ifa->ifa_local == sin->sin_addr.s_addr)
755 break;
756 inet_del_ifa(in_dev, ifap, 0);
757 ifa->ifa_broadcast = 0;
758 ifa->ifa_anycast = 0;
759 }
760
761 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
762
763 if (!(dev->flags & IFF_POINTOPOINT)) {
764 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
765 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
766 if ((dev->flags & IFF_BROADCAST) &&
767 ifa->ifa_prefixlen < 31)
768 ifa->ifa_broadcast = ifa->ifa_address |
769 ~ifa->ifa_mask;
770 } else {
771 ifa->ifa_prefixlen = 32;
772 ifa->ifa_mask = inet_make_mask(32);
773 }
774 ret = inet_set_ifa(dev, ifa);
775 break;
776
777 case SIOCSIFBRDADDR: /* Set the broadcast address */
778 ret = 0;
779 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
780 inet_del_ifa(in_dev, ifap, 0);
781 ifa->ifa_broadcast = sin->sin_addr.s_addr;
782 inet_insert_ifa(ifa);
783 }
784 break;
785
786 case SIOCSIFDSTADDR: /* Set the destination address */
787 ret = 0;
788 if (ifa->ifa_address == sin->sin_addr.s_addr)
789 break;
790 ret = -EINVAL;
791 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
792 break;
793 ret = 0;
794 inet_del_ifa(in_dev, ifap, 0);
795 ifa->ifa_address = sin->sin_addr.s_addr;
796 inet_insert_ifa(ifa);
797 break;
798
799 case SIOCSIFNETMASK: /* Set the netmask for the interface */
800
801 /*
802 * The mask we set must be legal.
803 */
804 ret = -EINVAL;
805 if (bad_mask(sin->sin_addr.s_addr, 0))
806 break;
807 ret = 0;
808 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
809 __be32 old_mask = ifa->ifa_mask;
810 inet_del_ifa(in_dev, ifap, 0);
811 ifa->ifa_mask = sin->sin_addr.s_addr;
812 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
813
814 /* See if current broadcast address matches
815 * with current netmask, then recalculate
816 * the broadcast address. Otherwise it's a
817 * funny address, so don't touch it since
818 * the user seems to know what (s)he's doing...
819 */
820 if ((dev->flags & IFF_BROADCAST) &&
821 (ifa->ifa_prefixlen < 31) &&
822 (ifa->ifa_broadcast ==
823 (ifa->ifa_local|~old_mask))) {
824 ifa->ifa_broadcast = (ifa->ifa_local |
825 ~sin->sin_addr.s_addr);
826 }
827 inet_insert_ifa(ifa);
828 }
829 break;
830 }
831 done:
832 rtnl_unlock();
833 out:
834 return ret;
835 rarok:
836 rtnl_unlock();
837 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
838 goto out;
839 }
840
841 static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
842 {
843 struct in_device *in_dev = __in_dev_get_rtnl(dev);
844 struct in_ifaddr *ifa;
845 struct ifreq ifr;
846 int done = 0;
847
848 if (!in_dev || (ifa = in_dev->ifa_list) == NULL)
849 goto out;
850
851 for (; ifa; ifa = ifa->ifa_next) {
852 if (!buf) {
853 done += sizeof(ifr);
854 continue;
855 }
856 if (len < (int) sizeof(ifr))
857 break;
858 memset(&ifr, 0, sizeof(struct ifreq));
859 if (ifa->ifa_label)
860 strcpy(ifr.ifr_name, ifa->ifa_label);
861 else
862 strcpy(ifr.ifr_name, dev->name);
863
864 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
865 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
866 ifa->ifa_local;
867
868 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
869 done = -EFAULT;
870 break;
871 }
872 buf += sizeof(struct ifreq);
873 len -= sizeof(struct ifreq);
874 done += sizeof(struct ifreq);
875 }
876 out:
877 return done;
878 }
879
880 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
881 {
882 __be32 addr = 0;
883 struct in_device *in_dev;
884
885 rcu_read_lock();
886 in_dev = __in_dev_get_rcu(dev);
887 if (!in_dev)
888 goto no_in_dev;
889
890 for_primary_ifa(in_dev) {
891 if (ifa->ifa_scope > scope)
892 continue;
893 if (!dst || inet_ifa_match(dst, ifa)) {
894 addr = ifa->ifa_local;
895 break;
896 }
897 if (!addr)
898 addr = ifa->ifa_local;
899 } endfor_ifa(in_dev);
900 no_in_dev:
901 rcu_read_unlock();
902
903 if (addr)
904 goto out;
905
906 /* Not loopback addresses on loopback should be preferred
907 in this case. It is importnat that lo is the first interface
908 in dev_base list.
909 */
910 read_lock(&dev_base_lock);
911 rcu_read_lock();
912 for_each_netdev(dev) {
913 if ((in_dev = __in_dev_get_rcu(dev)) == NULL)
914 continue;
915
916 for_primary_ifa(in_dev) {
917 if (ifa->ifa_scope != RT_SCOPE_LINK &&
918 ifa->ifa_scope <= scope) {
919 addr = ifa->ifa_local;
920 goto out_unlock_both;
921 }
922 } endfor_ifa(in_dev);
923 }
924 out_unlock_both:
925 read_unlock(&dev_base_lock);
926 rcu_read_unlock();
927 out:
928 return addr;
929 }
930
931 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
932 __be32 local, int scope)
933 {
934 int same = 0;
935 __be32 addr = 0;
936
937 for_ifa(in_dev) {
938 if (!addr &&
939 (local == ifa->ifa_local || !local) &&
940 ifa->ifa_scope <= scope) {
941 addr = ifa->ifa_local;
942 if (same)
943 break;
944 }
945 if (!same) {
946 same = (!local || inet_ifa_match(local, ifa)) &&
947 (!dst || inet_ifa_match(dst, ifa));
948 if (same && addr) {
949 if (local || !dst)
950 break;
951 /* Is the selected addr into dst subnet? */
952 if (inet_ifa_match(addr, ifa))
953 break;
954 /* No, then can we use new local src? */
955 if (ifa->ifa_scope <= scope) {
956 addr = ifa->ifa_local;
957 break;
958 }
959 /* search for large dst subnet for addr */
960 same = 0;
961 }
962 }
963 } endfor_ifa(in_dev);
964
965 return same? addr : 0;
966 }
967
968 /*
969 * Confirm that local IP address exists using wildcards:
970 * - dev: only on this interface, 0=any interface
971 * - dst: only in the same subnet as dst, 0=any dst
972 * - local: address, 0=autoselect the local address
973 * - scope: maximum allowed scope value for the local address
974 */
975 __be32 inet_confirm_addr(const struct net_device *dev, __be32 dst, __be32 local, int scope)
976 {
977 __be32 addr = 0;
978 struct in_device *in_dev;
979
980 if (dev) {
981 rcu_read_lock();
982 if ((in_dev = __in_dev_get_rcu(dev)))
983 addr = confirm_addr_indev(in_dev, dst, local, scope);
984 rcu_read_unlock();
985
986 return addr;
987 }
988
989 read_lock(&dev_base_lock);
990 rcu_read_lock();
991 for_each_netdev(dev) {
992 if ((in_dev = __in_dev_get_rcu(dev))) {
993 addr = confirm_addr_indev(in_dev, dst, local, scope);
994 if (addr)
995 break;
996 }
997 }
998 rcu_read_unlock();
999 read_unlock(&dev_base_lock);
1000
1001 return addr;
1002 }
1003
1004 /*
1005 * Device notifier
1006 */
1007
1008 int register_inetaddr_notifier(struct notifier_block *nb)
1009 {
1010 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1011 }
1012
1013 int unregister_inetaddr_notifier(struct notifier_block *nb)
1014 {
1015 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1016 }
1017
1018 /* Rename ifa_labels for a device name change. Make some effort to preserve existing
1019 * alias numbering and to create unique labels if possible.
1020 */
1021 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1022 {
1023 struct in_ifaddr *ifa;
1024 int named = 0;
1025
1026 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1027 char old[IFNAMSIZ], *dot;
1028
1029 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1030 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1031 if (named++ == 0)
1032 continue;
1033 dot = strchr(ifa->ifa_label, ':');
1034 if (dot == NULL) {
1035 sprintf(old, ":%d", named);
1036 dot = old;
1037 }
1038 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) {
1039 strcat(ifa->ifa_label, dot);
1040 } else {
1041 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1042 }
1043 }
1044 }
1045
1046 /* Called only under RTNL semaphore */
1047
1048 static int inetdev_event(struct notifier_block *this, unsigned long event,
1049 void *ptr)
1050 {
1051 struct net_device *dev = ptr;
1052 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1053
1054 ASSERT_RTNL();
1055
1056 if (!in_dev) {
1057 if (event == NETDEV_REGISTER) {
1058 in_dev = inetdev_init(dev);
1059 if (dev == &loopback_dev) {
1060 if (!in_dev)
1061 panic("devinet: "
1062 "Failed to create loopback\n");
1063 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1064 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1065 }
1066 }
1067 goto out;
1068 }
1069
1070 switch (event) {
1071 case NETDEV_REGISTER:
1072 printk(KERN_DEBUG "inetdev_event: bug\n");
1073 dev->ip_ptr = NULL;
1074 break;
1075 case NETDEV_UP:
1076 if (dev->mtu < 68)
1077 break;
1078 if (dev == &loopback_dev) {
1079 struct in_ifaddr *ifa;
1080 if ((ifa = inet_alloc_ifa()) != NULL) {
1081 ifa->ifa_local =
1082 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1083 ifa->ifa_prefixlen = 8;
1084 ifa->ifa_mask = inet_make_mask(8);
1085 in_dev_hold(in_dev);
1086 ifa->ifa_dev = in_dev;
1087 ifa->ifa_scope = RT_SCOPE_HOST;
1088 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1089 inet_insert_ifa(ifa);
1090 }
1091 }
1092 ip_mc_up(in_dev);
1093 break;
1094 case NETDEV_DOWN:
1095 ip_mc_down(in_dev);
1096 break;
1097 case NETDEV_CHANGEMTU:
1098 if (dev->mtu >= 68)
1099 break;
1100 /* MTU falled under 68, disable IP */
1101 case NETDEV_UNREGISTER:
1102 inetdev_destroy(in_dev);
1103 break;
1104 case NETDEV_CHANGENAME:
1105 /* Do not notify about label change, this event is
1106 * not interesting to applications using netlink.
1107 */
1108 inetdev_changename(dev, in_dev);
1109
1110 #ifdef CONFIG_SYSCTL
1111 devinet_sysctl_unregister(&in_dev->cnf);
1112 neigh_sysctl_unregister(in_dev->arp_parms);
1113 neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4,
1114 NET_IPV4_NEIGH, "ipv4", NULL, NULL);
1115 devinet_sysctl_register(in_dev, &in_dev->cnf);
1116 #endif
1117 break;
1118 }
1119 out:
1120 return NOTIFY_DONE;
1121 }
1122
1123 static struct notifier_block ip_netdev_notifier = {
1124 .notifier_call =inetdev_event,
1125 };
1126
1127 static inline size_t inet_nlmsg_size(void)
1128 {
1129 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1130 + nla_total_size(4) /* IFA_ADDRESS */
1131 + nla_total_size(4) /* IFA_LOCAL */
1132 + nla_total_size(4) /* IFA_BROADCAST */
1133 + nla_total_size(4) /* IFA_ANYCAST */
1134 + nla_total_size(IFNAMSIZ); /* IFA_LABEL */
1135 }
1136
1137 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1138 u32 pid, u32 seq, int event, unsigned int flags)
1139 {
1140 struct ifaddrmsg *ifm;
1141 struct nlmsghdr *nlh;
1142
1143 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
1144 if (nlh == NULL)
1145 return -EMSGSIZE;
1146
1147 ifm = nlmsg_data(nlh);
1148 ifm->ifa_family = AF_INET;
1149 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1150 ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
1151 ifm->ifa_scope = ifa->ifa_scope;
1152 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1153
1154 if (ifa->ifa_address)
1155 NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address);
1156
1157 if (ifa->ifa_local)
1158 NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local);
1159
1160 if (ifa->ifa_broadcast)
1161 NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast);
1162
1163 if (ifa->ifa_anycast)
1164 NLA_PUT_BE32(skb, IFA_ANYCAST, ifa->ifa_anycast);
1165
1166 if (ifa->ifa_label[0])
1167 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
1168
1169 return nlmsg_end(skb, nlh);
1170
1171 nla_put_failure:
1172 nlmsg_cancel(skb, nlh);
1173 return -EMSGSIZE;
1174 }
1175
1176 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1177 {
1178 int idx, ip_idx;
1179 struct net_device *dev;
1180 struct in_device *in_dev;
1181 struct in_ifaddr *ifa;
1182 int s_ip_idx, s_idx = cb->args[0];
1183
1184 s_ip_idx = ip_idx = cb->args[1];
1185 idx = 0;
1186 for_each_netdev(dev) {
1187 if (idx < s_idx)
1188 goto cont;
1189 if (idx > s_idx)
1190 s_ip_idx = 0;
1191 if ((in_dev = __in_dev_get_rtnl(dev)) == NULL)
1192 goto cont;
1193
1194 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1195 ifa = ifa->ifa_next, ip_idx++) {
1196 if (ip_idx < s_ip_idx)
1197 goto cont;
1198 if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
1199 cb->nlh->nlmsg_seq,
1200 RTM_NEWADDR, NLM_F_MULTI) <= 0)
1201 goto done;
1202 }
1203 cont:
1204 idx++;
1205 }
1206
1207 done:
1208 cb->args[0] = idx;
1209 cb->args[1] = ip_idx;
1210
1211 return skb->len;
1212 }
1213
1214 static void rtmsg_ifa(int event, struct in_ifaddr* ifa, struct nlmsghdr *nlh,
1215 u32 pid)
1216 {
1217 struct sk_buff *skb;
1218 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1219 int err = -ENOBUFS;
1220
1221 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1222 if (skb == NULL)
1223 goto errout;
1224
1225 err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0);
1226 if (err < 0) {
1227 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1228 WARN_ON(err == -EMSGSIZE);
1229 kfree_skb(skb);
1230 goto errout;
1231 }
1232 err = rtnl_notify(skb, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1233 errout:
1234 if (err < 0)
1235 rtnl_set_sk_err(RTNLGRP_IPV4_IFADDR, err);
1236 }
1237
1238 #ifdef CONFIG_SYSCTL
1239
1240 static void devinet_copy_dflt_conf(int i)
1241 {
1242 struct net_device *dev;
1243
1244 read_lock(&dev_base_lock);
1245 for_each_netdev(dev) {
1246 struct in_device *in_dev;
1247 rcu_read_lock();
1248 in_dev = __in_dev_get_rcu(dev);
1249 if (in_dev && !test_bit(i, in_dev->cnf.state))
1250 in_dev->cnf.data[i] = ipv4_devconf_dflt.data[i];
1251 rcu_read_unlock();
1252 }
1253 read_unlock(&dev_base_lock);
1254 }
1255
1256 static int devinet_conf_proc(ctl_table *ctl, int write,
1257 struct file* filp, void __user *buffer,
1258 size_t *lenp, loff_t *ppos)
1259 {
1260 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1261
1262 if (write) {
1263 struct ipv4_devconf *cnf = ctl->extra1;
1264 int i = (int *)ctl->data - cnf->data;
1265
1266 set_bit(i, cnf->state);
1267
1268 if (cnf == &ipv4_devconf_dflt)
1269 devinet_copy_dflt_conf(i);
1270 }
1271
1272 return ret;
1273 }
1274
1275 static int devinet_conf_sysctl(ctl_table *table, int __user *name, int nlen,
1276 void __user *oldval, size_t __user *oldlenp,
1277 void __user *newval, size_t newlen)
1278 {
1279 struct ipv4_devconf *cnf;
1280 int *valp = table->data;
1281 int new;
1282 int i;
1283
1284 if (!newval || !newlen)
1285 return 0;
1286
1287 if (newlen != sizeof(int))
1288 return -EINVAL;
1289
1290 if (get_user(new, (int __user *)newval))
1291 return -EFAULT;
1292
1293 if (new == *valp)
1294 return 0;
1295
1296 if (oldval && oldlenp) {
1297 size_t len;
1298
1299 if (get_user(len, oldlenp))
1300 return -EFAULT;
1301
1302 if (len) {
1303 if (len > table->maxlen)
1304 len = table->maxlen;
1305 if (copy_to_user(oldval, valp, len))
1306 return -EFAULT;
1307 if (put_user(len, oldlenp))
1308 return -EFAULT;
1309 }
1310 }
1311
1312 *valp = new;
1313
1314 cnf = table->extra1;
1315 i = (int *)table->data - cnf->data;
1316
1317 set_bit(i, cnf->state);
1318
1319 if (cnf == &ipv4_devconf_dflt)
1320 devinet_copy_dflt_conf(i);
1321
1322 return 1;
1323 }
1324
1325 void inet_forward_change(void)
1326 {
1327 struct net_device *dev;
1328 int on = IPV4_DEVCONF_ALL(FORWARDING);
1329
1330 IPV4_DEVCONF_ALL(ACCEPT_REDIRECTS) = !on;
1331 IPV4_DEVCONF_DFLT(FORWARDING) = on;
1332
1333 read_lock(&dev_base_lock);
1334 for_each_netdev(dev) {
1335 struct in_device *in_dev;
1336 rcu_read_lock();
1337 in_dev = __in_dev_get_rcu(dev);
1338 if (in_dev)
1339 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
1340 rcu_read_unlock();
1341 }
1342 read_unlock(&dev_base_lock);
1343
1344 rt_cache_flush(0);
1345 }
1346
1347 static int devinet_sysctl_forward(ctl_table *ctl, int write,
1348 struct file* filp, void __user *buffer,
1349 size_t *lenp, loff_t *ppos)
1350 {
1351 int *valp = ctl->data;
1352 int val = *valp;
1353 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1354
1355 if (write && *valp != val) {
1356 if (valp == &IPV4_DEVCONF_ALL(FORWARDING))
1357 inet_forward_change();
1358 else if (valp != &IPV4_DEVCONF_DFLT(FORWARDING))
1359 rt_cache_flush(0);
1360 }
1361
1362 return ret;
1363 }
1364
1365 int ipv4_doint_and_flush(ctl_table *ctl, int write,
1366 struct file* filp, void __user *buffer,
1367 size_t *lenp, loff_t *ppos)
1368 {
1369 int *valp = ctl->data;
1370 int val = *valp;
1371 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1372
1373 if (write && *valp != val)
1374 rt_cache_flush(0);
1375
1376 return ret;
1377 }
1378
1379 int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen,
1380 void __user *oldval, size_t __user *oldlenp,
1381 void __user *newval, size_t newlen)
1382 {
1383 int ret = devinet_conf_sysctl(table, name, nlen, oldval, oldlenp,
1384 newval, newlen);
1385
1386 if (ret == 1)
1387 rt_cache_flush(0);
1388
1389 return ret;
1390 }
1391
1392
1393 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc, sysctl) \
1394 { \
1395 .ctl_name = NET_IPV4_CONF_ ## attr, \
1396 .procname = name, \
1397 .data = ipv4_devconf.data + \
1398 NET_IPV4_CONF_ ## attr - 1, \
1399 .maxlen = sizeof(int), \
1400 .mode = mval, \
1401 .proc_handler = proc, \
1402 .strategy = sysctl, \
1403 .extra1 = &ipv4_devconf, \
1404 }
1405
1406 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
1407 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc, \
1408 devinet_conf_sysctl)
1409
1410 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
1411 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc, \
1412 devinet_conf_sysctl)
1413
1414 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc, sysctl) \
1415 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc, sysctl)
1416
1417 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
1418 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush, \
1419 ipv4_doint_and_flush_strategy)
1420
1421 static struct devinet_sysctl_table {
1422 struct ctl_table_header *sysctl_header;
1423 ctl_table devinet_vars[__NET_IPV4_CONF_MAX];
1424 ctl_table devinet_dev[2];
1425 ctl_table devinet_conf_dir[2];
1426 ctl_table devinet_proto_dir[2];
1427 ctl_table devinet_root_dir[2];
1428 } devinet_sysctl = {
1429 .devinet_vars = {
1430 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
1431 devinet_sysctl_forward,
1432 devinet_conf_sysctl),
1433 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
1434
1435 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
1436 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
1437 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
1438 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
1439 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
1440 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
1441 "accept_source_route"),
1442 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
1443 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
1444 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
1445 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
1446 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
1447 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
1448 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
1449 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
1450 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
1451
1452 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
1453 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
1454 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
1455 "force_igmp_version"),
1456 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
1457 "promote_secondaries"),
1458 },
1459 .devinet_dev = {
1460 {
1461 .ctl_name = NET_PROTO_CONF_ALL,
1462 .procname = "all",
1463 .mode = 0555,
1464 .child = devinet_sysctl.devinet_vars,
1465 },
1466 },
1467 .devinet_conf_dir = {
1468 {
1469 .ctl_name = NET_IPV4_CONF,
1470 .procname = "conf",
1471 .mode = 0555,
1472 .child = devinet_sysctl.devinet_dev,
1473 },
1474 },
1475 .devinet_proto_dir = {
1476 {
1477 .ctl_name = NET_IPV4,
1478 .procname = "ipv4",
1479 .mode = 0555,
1480 .child = devinet_sysctl.devinet_conf_dir,
1481 },
1482 },
1483 .devinet_root_dir = {
1484 {
1485 .ctl_name = CTL_NET,
1486 .procname = "net",
1487 .mode = 0555,
1488 .child = devinet_sysctl.devinet_proto_dir,
1489 },
1490 },
1491 };
1492
1493 static void devinet_sysctl_register(struct in_device *in_dev,
1494 struct ipv4_devconf *p)
1495 {
1496 int i;
1497 struct net_device *dev = in_dev ? in_dev->dev : NULL;
1498 struct devinet_sysctl_table *t = kmemdup(&devinet_sysctl, sizeof(*t),
1499 GFP_KERNEL);
1500 char *dev_name = NULL;
1501
1502 if (!t)
1503 return;
1504 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
1505 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
1506 t->devinet_vars[i].extra1 = p;
1507 }
1508
1509 if (dev) {
1510 dev_name = dev->name;
1511 t->devinet_dev[0].ctl_name = dev->ifindex;
1512 } else {
1513 dev_name = "default";
1514 t->devinet_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
1515 }
1516
1517 /*
1518 * Make a copy of dev_name, because '.procname' is regarded as const
1519 * by sysctl and we wouldn't want anyone to change it under our feet
1520 * (see SIOCSIFNAME).
1521 */
1522 dev_name = kstrdup(dev_name, GFP_KERNEL);
1523 if (!dev_name)
1524 goto free;
1525
1526 t->devinet_dev[0].procname = dev_name;
1527 t->devinet_dev[0].child = t->devinet_vars;
1528 t->devinet_conf_dir[0].child = t->devinet_dev;
1529 t->devinet_proto_dir[0].child = t->devinet_conf_dir;
1530 t->devinet_root_dir[0].child = t->devinet_proto_dir;
1531
1532 t->sysctl_header = register_sysctl_table(t->devinet_root_dir);
1533 if (!t->sysctl_header)
1534 goto free_procname;
1535
1536 p->sysctl = t;
1537 return;
1538
1539 /* error path */
1540 free_procname:
1541 kfree(dev_name);
1542 free:
1543 kfree(t);
1544 return;
1545 }
1546
1547 static void devinet_sysctl_unregister(struct ipv4_devconf *p)
1548 {
1549 if (p->sysctl) {
1550 struct devinet_sysctl_table *t = p->sysctl;
1551 p->sysctl = NULL;
1552 unregister_sysctl_table(t->sysctl_header);
1553 kfree(t->devinet_dev[0].procname);
1554 kfree(t);
1555 }
1556 }
1557 #endif
1558
1559 void __init devinet_init(void)
1560 {
1561 register_gifconf(PF_INET, inet_gifconf);
1562 register_netdevice_notifier(&ip_netdev_notifier);
1563
1564 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL);
1565 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL);
1566 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr);
1567 #ifdef CONFIG_SYSCTL
1568 devinet_sysctl.sysctl_header =
1569 register_sysctl_table(devinet_sysctl.devinet_root_dir);
1570 devinet_sysctl_register(NULL, &ipv4_devconf_dflt);
1571 #endif
1572 }
1573
1574 EXPORT_SYMBOL(in_dev_finish_destroy);
1575 EXPORT_SYMBOL(inet_select_addr);
1576 EXPORT_SYMBOL(inetdev_by_index);
1577 EXPORT_SYMBOL(register_inetaddr_notifier);
1578 EXPORT_SYMBOL(unregister_inetaddr_notifier);
Linux kernel - Deliverables
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