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[S390] Cleanup 3270 printk messages.
[linux-2.6/kvm.git] / net / ipv4 / devinet.c
blob79a7ef6209ffe32a0ba0c99c82b47d36e5a947d2
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 #include <net/net_namespace.h>
66
67 static struct ipv4_devconf ipv4_devconf = {
68 .data = {
69 [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1,
70 [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1,
71 [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1,
72 [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1,
73 },
74 };
75
76 static struct ipv4_devconf ipv4_devconf_dflt = {
77 .data = {
78 [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1,
79 [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1,
80 [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1,
81 [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1,
82 [NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
83 },
84 };
85
86 #define IPV4_DEVCONF_DFLT(net, attr) \
87 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
88
89 static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
90 [IFA_LOCAL] = { .type = NLA_U32 },
91 [IFA_ADDRESS] = { .type = NLA_U32 },
92 [IFA_BROADCAST] = { .type = NLA_U32 },
93 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
94 };
95
96 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
97
98 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
99 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
100 int destroy);
101 #ifdef CONFIG_SYSCTL
102 static void devinet_sysctl_register(struct in_device *idev);
103 static void devinet_sysctl_unregister(struct in_device *idev);
104 #else
105 static inline void devinet_sysctl_register(struct in_device *idev)
106 {
107 }
108 static inline void devinet_sysctl_unregister(struct in_device *idev)
109 {
110 }
111 #endif
112
113 /* Locks all the inet devices. */
114
115 static struct in_ifaddr *inet_alloc_ifa(void)
116 {
117 struct in_ifaddr *ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
118
119 if (ifa) {
120 INIT_RCU_HEAD(&ifa->rcu_head);
121 }
122
123 return ifa;
124 }
125
126 static void inet_rcu_free_ifa(struct rcu_head *head)
127 {
128 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
129 if (ifa->ifa_dev)
130 in_dev_put(ifa->ifa_dev);
131 kfree(ifa);
132 }
133
134 static inline void inet_free_ifa(struct in_ifaddr *ifa)
135 {
136 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
137 }
138
139 void in_dev_finish_destroy(struct in_device *idev)
140 {
141 struct net_device *dev = idev->dev;
142
143 BUG_TRAP(!idev->ifa_list);
144 BUG_TRAP(!idev->mc_list);
145 #ifdef NET_REFCNT_DEBUG
146 printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n",
147 idev, dev ? dev->name : "NIL");
148 #endif
149 dev_put(dev);
150 if (!idev->dead)
151 printk("Freeing alive in_device %p\n", idev);
152 else {
153 kfree(idev);
154 }
155 }
156
157 static struct in_device *inetdev_init(struct net_device *dev)
158 {
159 struct in_device *in_dev;
160
161 ASSERT_RTNL();
162
163 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
164 if (!in_dev)
165 goto out;
166 INIT_RCU_HEAD(&in_dev->rcu_head);
167 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
168 sizeof(in_dev->cnf));
169 in_dev->cnf.sysctl = NULL;
170 in_dev->dev = dev;
171 if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL)
172 goto out_kfree;
173 /* Reference in_dev->dev */
174 dev_hold(dev);
175 /* Account for reference dev->ip_ptr (below) */
176 in_dev_hold(in_dev);
177
178 devinet_sysctl_register(in_dev);
179 ip_mc_init_dev(in_dev);
180 if (dev->flags & IFF_UP)
181 ip_mc_up(in_dev);
182
183 /* we can receive as soon as ip_ptr is set -- do this last */
184 rcu_assign_pointer(dev->ip_ptr, in_dev);
185 out:
186 return in_dev;
187 out_kfree:
188 kfree(in_dev);
189 in_dev = NULL;
190 goto out;
191 }
192
193 static void in_dev_rcu_put(struct rcu_head *head)
194 {
195 struct in_device *idev = container_of(head, struct in_device, rcu_head);
196 in_dev_put(idev);
197 }
198
199 static void inetdev_destroy(struct in_device *in_dev)
200 {
201 struct in_ifaddr *ifa;
202 struct net_device *dev;
203
204 ASSERT_RTNL();
205
206 dev = in_dev->dev;
207
208 in_dev->dead = 1;
209
210 ip_mc_destroy_dev(in_dev);
211
212 while ((ifa = in_dev->ifa_list) != NULL) {
213 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
214 inet_free_ifa(ifa);
215 }
216
217 dev->ip_ptr = NULL;
218
219 devinet_sysctl_unregister(in_dev);
220 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
221 arp_ifdown(dev);
222
223 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
224 }
225
226 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
227 {
228 rcu_read_lock();
229 for_primary_ifa(in_dev) {
230 if (inet_ifa_match(a, ifa)) {
231 if (!b || inet_ifa_match(b, ifa)) {
232 rcu_read_unlock();
233 return 1;
234 }
235 }
236 } endfor_ifa(in_dev);
237 rcu_read_unlock();
238 return 0;
239 }
240
241 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
242 int destroy, struct nlmsghdr *nlh, u32 pid)
243 {
244 struct in_ifaddr *promote = NULL;
245 struct in_ifaddr *ifa, *ifa1 = *ifap;
246 struct in_ifaddr *last_prim = in_dev->ifa_list;
247 struct in_ifaddr *prev_prom = NULL;
248 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
249
250 ASSERT_RTNL();
251
252 /* 1. Deleting primary ifaddr forces deletion all secondaries
253 * unless alias promotion is set
254 **/
255
256 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
257 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
258
259 while ((ifa = *ifap1) != NULL) {
260 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
261 ifa1->ifa_scope <= ifa->ifa_scope)
262 last_prim = ifa;
263
264 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
265 ifa1->ifa_mask != ifa->ifa_mask ||
266 !inet_ifa_match(ifa1->ifa_address, ifa)) {
267 ifap1 = &ifa->ifa_next;
268 prev_prom = ifa;
269 continue;
270 }
271
272 if (!do_promote) {
273 *ifap1 = ifa->ifa_next;
274
275 rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid);
276 blocking_notifier_call_chain(&inetaddr_chain,
277 NETDEV_DOWN, ifa);
278 inet_free_ifa(ifa);
279 } else {
280 promote = ifa;
281 break;
282 }
283 }
284 }
285
286 /* 2. Unlink it */
287
288 *ifap = ifa1->ifa_next;
289
290 /* 3. Announce address deletion */
291
292 /* Send message first, then call notifier.
293 At first sight, FIB update triggered by notifier
294 will refer to already deleted ifaddr, that could confuse
295 netlink listeners. It is not true: look, gated sees
296 that route deleted and if it still thinks that ifaddr
297 is valid, it will try to restore deleted routes... Grr.
298 So that, this order is correct.
299 */
300 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid);
301 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
302
303 if (promote) {
304
305 if (prev_prom) {
306 prev_prom->ifa_next = promote->ifa_next;
307 promote->ifa_next = last_prim->ifa_next;
308 last_prim->ifa_next = promote;
309 }
310
311 promote->ifa_flags &= ~IFA_F_SECONDARY;
312 rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid);
313 blocking_notifier_call_chain(&inetaddr_chain,
314 NETDEV_UP, promote);
315 for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) {
316 if (ifa1->ifa_mask != ifa->ifa_mask ||
317 !inet_ifa_match(ifa1->ifa_address, ifa))
318 continue;
319 fib_add_ifaddr(ifa);
320 }
321
322 }
323 if (destroy)
324 inet_free_ifa(ifa1);
325 }
326
327 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
328 int destroy)
329 {
330 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
331 }
332
333 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
334 u32 pid)
335 {
336 struct in_device *in_dev = ifa->ifa_dev;
337 struct in_ifaddr *ifa1, **ifap, **last_primary;
338
339 ASSERT_RTNL();
340
341 if (!ifa->ifa_local) {
342 inet_free_ifa(ifa);
343 return 0;
344 }
345
346 ifa->ifa_flags &= ~IFA_F_SECONDARY;
347 last_primary = &in_dev->ifa_list;
348
349 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
350 ifap = &ifa1->ifa_next) {
351 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
352 ifa->ifa_scope <= ifa1->ifa_scope)
353 last_primary = &ifa1->ifa_next;
354 if (ifa1->ifa_mask == ifa->ifa_mask &&
355 inet_ifa_match(ifa1->ifa_address, ifa)) {
356 if (ifa1->ifa_local == ifa->ifa_local) {
357 inet_free_ifa(ifa);
358 return -EEXIST;
359 }
360 if (ifa1->ifa_scope != ifa->ifa_scope) {
361 inet_free_ifa(ifa);
362 return -EINVAL;
363 }
364 ifa->ifa_flags |= IFA_F_SECONDARY;
365 }
366 }
367
368 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
369 net_srandom(ifa->ifa_local);
370 ifap = last_primary;
371 }
372
373 ifa->ifa_next = *ifap;
374 *ifap = ifa;
375
376 /* Send message first, then call notifier.
377 Notifier will trigger FIB update, so that
378 listeners of netlink will know about new ifaddr */
379 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid);
380 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
381
382 return 0;
383 }
384
385 static int inet_insert_ifa(struct in_ifaddr *ifa)
386 {
387 return __inet_insert_ifa(ifa, NULL, 0);
388 }
389
390 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
391 {
392 struct in_device *in_dev = __in_dev_get_rtnl(dev);
393
394 ASSERT_RTNL();
395
396 if (!in_dev) {
397 inet_free_ifa(ifa);
398 return -ENOBUFS;
399 }
400 ipv4_devconf_setall(in_dev);
401 if (ifa->ifa_dev != in_dev) {
402 BUG_TRAP(!ifa->ifa_dev);
403 in_dev_hold(in_dev);
404 ifa->ifa_dev = in_dev;
405 }
406 if (ipv4_is_loopback(ifa->ifa_local))
407 ifa->ifa_scope = RT_SCOPE_HOST;
408 return inet_insert_ifa(ifa);
409 }
410
411 struct in_device *inetdev_by_index(struct net *net, int ifindex)
412 {
413 struct net_device *dev;
414 struct in_device *in_dev = NULL;
415 read_lock(&dev_base_lock);
416 dev = __dev_get_by_index(net, ifindex);
417 if (dev)
418 in_dev = in_dev_get(dev);
419 read_unlock(&dev_base_lock);
420 return in_dev;
421 }
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 __in_dev_put(in_dev);
460
461 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
462 ifap = &ifa->ifa_next) {
463 if (tb[IFA_LOCAL] &&
464 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
465 continue;
466
467 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
468 continue;
469
470 if (tb[IFA_ADDRESS] &&
471 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
472 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
473 continue;
474
475 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid);
476 return 0;
477 }
478
479 err = -EADDRNOTAVAIL;
480 errout:
481 return err;
482 }
483
484 static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh)
485 {
486 struct nlattr *tb[IFA_MAX+1];
487 struct in_ifaddr *ifa;
488 struct ifaddrmsg *ifm;
489 struct net_device *dev;
490 struct in_device *in_dev;
491 int err;
492
493 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
494 if (err < 0)
495 goto errout;
496
497 ifm = nlmsg_data(nlh);
498 err = -EINVAL;
499 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
500 goto errout;
501
502 dev = __dev_get_by_index(net, ifm->ifa_index);
503 err = -ENODEV;
504 if (dev == NULL)
505 goto errout;
506
507 in_dev = __in_dev_get_rtnl(dev);
508 err = -ENOBUFS;
509 if (in_dev == NULL)
510 goto errout;
511
512 ifa = inet_alloc_ifa();
513 if (ifa == NULL)
514 /*
515 * A potential indev allocation can be left alive, it stays
516 * assigned to its device and is destroy with it.
517 */
518 goto errout;
519
520 ipv4_devconf_setall(in_dev);
521 in_dev_hold(in_dev);
522
523 if (tb[IFA_ADDRESS] == NULL)
524 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
525
526 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
527 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
528 ifa->ifa_flags = ifm->ifa_flags;
529 ifa->ifa_scope = ifm->ifa_scope;
530 ifa->ifa_dev = in_dev;
531
532 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
533 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
534
535 if (tb[IFA_BROADCAST])
536 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
537
538 if (tb[IFA_LABEL])
539 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
540 else
541 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
542
543 return ifa;
544
545 errout:
546 return ERR_PTR(err);
547 }
548
549 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
550 {
551 struct net *net = sock_net(skb->sk);
552 struct in_ifaddr *ifa;
553
554 ASSERT_RTNL();
555
556 ifa = rtm_to_ifaddr(net, nlh);
557 if (IS_ERR(ifa))
558 return PTR_ERR(ifa);
559
560 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid);
561 }
562
563 /*
564 * Determine a default network mask, based on the IP address.
565 */
566
567 static __inline__ int inet_abc_len(__be32 addr)
568 {
569 int rc = -1; /* Something else, probably a multicast. */
570
571 if (ipv4_is_zeronet(addr))
572 rc = 0;
573 else {
574 __u32 haddr = ntohl(addr);
575
576 if (IN_CLASSA(haddr))
577 rc = 8;
578 else if (IN_CLASSB(haddr))
579 rc = 16;
580 else if (IN_CLASSC(haddr))
581 rc = 24;
582 }
583
584 return rc;
585 }
586
587
588 int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
589 {
590 struct ifreq ifr;
591 struct sockaddr_in sin_orig;
592 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
593 struct in_device *in_dev;
594 struct in_ifaddr **ifap = NULL;
595 struct in_ifaddr *ifa = NULL;
596 struct net_device *dev;
597 char *colon;
598 int ret = -EFAULT;
599 int tryaddrmatch = 0;
600
601 /*
602 * Fetch the caller's info block into kernel space
603 */
604
605 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
606 goto out;
607 ifr.ifr_name[IFNAMSIZ - 1] = 0;
608
609 /* save original address for comparison */
610 memcpy(&sin_orig, sin, sizeof(*sin));
611
612 colon = strchr(ifr.ifr_name, ':');
613 if (colon)
614 *colon = 0;
615
616 #ifdef CONFIG_KMOD
617 dev_load(net, ifr.ifr_name);
618 #endif
619
620 switch (cmd) {
621 case SIOCGIFADDR: /* Get interface address */
622 case SIOCGIFBRDADDR: /* Get the broadcast address */
623 case SIOCGIFDSTADDR: /* Get the destination address */
624 case SIOCGIFNETMASK: /* Get the netmask for the interface */
625 /* Note that these ioctls will not sleep,
626 so that we do not impose a lock.
627 One day we will be forced to put shlock here (I mean SMP)
628 */
629 tryaddrmatch = (sin_orig.sin_family == AF_INET);
630 memset(sin, 0, sizeof(*sin));
631 sin->sin_family = AF_INET;
632 break;
633
634 case SIOCSIFFLAGS:
635 ret = -EACCES;
636 if (!capable(CAP_NET_ADMIN))
637 goto out;
638 break;
639 case SIOCSIFADDR: /* Set interface address (and family) */
640 case SIOCSIFBRDADDR: /* Set the broadcast address */
641 case SIOCSIFDSTADDR: /* Set the destination address */
642 case SIOCSIFNETMASK: /* Set the netmask for the interface */
643 ret = -EACCES;
644 if (!capable(CAP_NET_ADMIN))
645 goto out;
646 ret = -EINVAL;
647 if (sin->sin_family != AF_INET)
648 goto out;
649 break;
650 default:
651 ret = -EINVAL;
652 goto out;
653 }
654
655 rtnl_lock();
656
657 ret = -ENODEV;
658 if ((dev = __dev_get_by_name(net, ifr.ifr_name)) == NULL)
659 goto done;
660
661 if (colon)
662 *colon = ':';
663
664 if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) {
665 if (tryaddrmatch) {
666 /* Matthias Andree */
667 /* compare label and address (4.4BSD style) */
668 /* note: we only do this for a limited set of ioctls
669 and only if the original address family was AF_INET.
670 This is checked above. */
671 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
672 ifap = &ifa->ifa_next) {
673 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
674 sin_orig.sin_addr.s_addr ==
675 ifa->ifa_address) {
676 break; /* found */
677 }
678 }
679 }
680 /* we didn't get a match, maybe the application is
681 4.3BSD-style and passed in junk so we fall back to
682 comparing just the label */
683 if (!ifa) {
684 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
685 ifap = &ifa->ifa_next)
686 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
687 break;
688 }
689 }
690
691 ret = -EADDRNOTAVAIL;
692 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
693 goto done;
694
695 switch (cmd) {
696 case SIOCGIFADDR: /* Get interface address */
697 sin->sin_addr.s_addr = ifa->ifa_local;
698 goto rarok;
699
700 case SIOCGIFBRDADDR: /* Get the broadcast address */
701 sin->sin_addr.s_addr = ifa->ifa_broadcast;
702 goto rarok;
703
704 case SIOCGIFDSTADDR: /* Get the destination address */
705 sin->sin_addr.s_addr = ifa->ifa_address;
706 goto rarok;
707
708 case SIOCGIFNETMASK: /* Get the netmask for the interface */
709 sin->sin_addr.s_addr = ifa->ifa_mask;
710 goto rarok;
711
712 case SIOCSIFFLAGS:
713 if (colon) {
714 ret = -EADDRNOTAVAIL;
715 if (!ifa)
716 break;
717 ret = 0;
718 if (!(ifr.ifr_flags & IFF_UP))
719 inet_del_ifa(in_dev, ifap, 1);
720 break;
721 }
722 ret = dev_change_flags(dev, ifr.ifr_flags);
723 break;
724
725 case SIOCSIFADDR: /* Set interface address (and family) */
726 ret = -EINVAL;
727 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
728 break;
729
730 if (!ifa) {
731 ret = -ENOBUFS;
732 if ((ifa = inet_alloc_ifa()) == NULL)
733 break;
734 if (colon)
735 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
736 else
737 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
738 } else {
739 ret = 0;
740 if (ifa->ifa_local == sin->sin_addr.s_addr)
741 break;
742 inet_del_ifa(in_dev, ifap, 0);
743 ifa->ifa_broadcast = 0;
744 ifa->ifa_scope = 0;
745 }
746
747 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
748
749 if (!(dev->flags & IFF_POINTOPOINT)) {
750 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
751 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
752 if ((dev->flags & IFF_BROADCAST) &&
753 ifa->ifa_prefixlen < 31)
754 ifa->ifa_broadcast = ifa->ifa_address |
755 ~ifa->ifa_mask;
756 } else {
757 ifa->ifa_prefixlen = 32;
758 ifa->ifa_mask = inet_make_mask(32);
759 }
760 ret = inet_set_ifa(dev, ifa);
761 break;
762
763 case SIOCSIFBRDADDR: /* Set the broadcast address */
764 ret = 0;
765 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
766 inet_del_ifa(in_dev, ifap, 0);
767 ifa->ifa_broadcast = sin->sin_addr.s_addr;
768 inet_insert_ifa(ifa);
769 }
770 break;
771
772 case SIOCSIFDSTADDR: /* Set the destination address */
773 ret = 0;
774 if (ifa->ifa_address == sin->sin_addr.s_addr)
775 break;
776 ret = -EINVAL;
777 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
778 break;
779 ret = 0;
780 inet_del_ifa(in_dev, ifap, 0);
781 ifa->ifa_address = sin->sin_addr.s_addr;
782 inet_insert_ifa(ifa);
783 break;
784
785 case SIOCSIFNETMASK: /* Set the netmask for the interface */
786
787 /*
788 * The mask we set must be legal.
789 */
790 ret = -EINVAL;
791 if (bad_mask(sin->sin_addr.s_addr, 0))
792 break;
793 ret = 0;
794 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
795 __be32 old_mask = ifa->ifa_mask;
796 inet_del_ifa(in_dev, ifap, 0);
797 ifa->ifa_mask = sin->sin_addr.s_addr;
798 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
799
800 /* See if current broadcast address matches
801 * with current netmask, then recalculate
802 * the broadcast address. Otherwise it's a
803 * funny address, so don't touch it since
804 * the user seems to know what (s)he's doing...
805 */
806 if ((dev->flags & IFF_BROADCAST) &&
807 (ifa->ifa_prefixlen < 31) &&
808 (ifa->ifa_broadcast ==
809 (ifa->ifa_local|~old_mask))) {
810 ifa->ifa_broadcast = (ifa->ifa_local |
811 ~sin->sin_addr.s_addr);
812 }
813 inet_insert_ifa(ifa);
814 }
815 break;
816 }
817 done:
818 rtnl_unlock();
819 out:
820 return ret;
821 rarok:
822 rtnl_unlock();
823 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
824 goto out;
825 }
826
827 static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
828 {
829 struct in_device *in_dev = __in_dev_get_rtnl(dev);
830 struct in_ifaddr *ifa;
831 struct ifreq ifr;
832 int done = 0;
833
834 if (!in_dev || (ifa = in_dev->ifa_list) == NULL)
835 goto out;
836
837 for (; ifa; ifa = ifa->ifa_next) {
838 if (!buf) {
839 done += sizeof(ifr);
840 continue;
841 }
842 if (len < (int) sizeof(ifr))
843 break;
844 memset(&ifr, 0, sizeof(struct ifreq));
845 if (ifa->ifa_label)
846 strcpy(ifr.ifr_name, ifa->ifa_label);
847 else
848 strcpy(ifr.ifr_name, dev->name);
849
850 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
851 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
852 ifa->ifa_local;
853
854 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
855 done = -EFAULT;
856 break;
857 }
858 buf += sizeof(struct ifreq);
859 len -= sizeof(struct ifreq);
860 done += sizeof(struct ifreq);
861 }
862 out:
863 return done;
864 }
865
866 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
867 {
868 __be32 addr = 0;
869 struct in_device *in_dev;
870 struct net *net = dev_net(dev);
871
872 rcu_read_lock();
873 in_dev = __in_dev_get_rcu(dev);
874 if (!in_dev)
875 goto no_in_dev;
876
877 for_primary_ifa(in_dev) {
878 if (ifa->ifa_scope > scope)
879 continue;
880 if (!dst || inet_ifa_match(dst, ifa)) {
881 addr = ifa->ifa_local;
882 break;
883 }
884 if (!addr)
885 addr = ifa->ifa_local;
886 } endfor_ifa(in_dev);
887 no_in_dev:
888 rcu_read_unlock();
889
890 if (addr)
891 goto out;
892
893 /* Not loopback addresses on loopback should be preferred
894 in this case. It is importnat that lo is the first interface
895 in dev_base list.
896 */
897 read_lock(&dev_base_lock);
898 rcu_read_lock();
899 for_each_netdev(net, dev) {
900 if ((in_dev = __in_dev_get_rcu(dev)) == NULL)
901 continue;
902
903 for_primary_ifa(in_dev) {
904 if (ifa->ifa_scope != RT_SCOPE_LINK &&
905 ifa->ifa_scope <= scope) {
906 addr = ifa->ifa_local;
907 goto out_unlock_both;
908 }
909 } endfor_ifa(in_dev);
910 }
911 out_unlock_both:
912 read_unlock(&dev_base_lock);
913 rcu_read_unlock();
914 out:
915 return addr;
916 }
917
918 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
919 __be32 local, int scope)
920 {
921 int same = 0;
922 __be32 addr = 0;
923
924 for_ifa(in_dev) {
925 if (!addr &&
926 (local == ifa->ifa_local || !local) &&
927 ifa->ifa_scope <= scope) {
928 addr = ifa->ifa_local;
929 if (same)
930 break;
931 }
932 if (!same) {
933 same = (!local || inet_ifa_match(local, ifa)) &&
934 (!dst || inet_ifa_match(dst, ifa));
935 if (same && addr) {
936 if (local || !dst)
937 break;
938 /* Is the selected addr into dst subnet? */
939 if (inet_ifa_match(addr, ifa))
940 break;
941 /* No, then can we use new local src? */
942 if (ifa->ifa_scope <= scope) {
943 addr = ifa->ifa_local;
944 break;
945 }
946 /* search for large dst subnet for addr */
947 same = 0;
948 }
949 }
950 } endfor_ifa(in_dev);
951
952 return same? addr : 0;
953 }
954
955 /*
956 * Confirm that local IP address exists using wildcards:
957 * - in_dev: only on this interface, 0=any interface
958 * - dst: only in the same subnet as dst, 0=any dst
959 * - local: address, 0=autoselect the local address
960 * - scope: maximum allowed scope value for the local address
961 */
962 __be32 inet_confirm_addr(struct in_device *in_dev,
963 __be32 dst, __be32 local, int scope)
964 {
965 __be32 addr = 0;
966 struct net_device *dev;
967 struct net *net;
968
969 if (scope != RT_SCOPE_LINK)
970 return confirm_addr_indev(in_dev, dst, local, scope);
971
972 net = dev_net(in_dev->dev);
973 read_lock(&dev_base_lock);
974 rcu_read_lock();
975 for_each_netdev(net, dev) {
976 if ((in_dev = __in_dev_get_rcu(dev))) {
977 addr = confirm_addr_indev(in_dev, dst, local, scope);
978 if (addr)
979 break;
980 }
981 }
982 rcu_read_unlock();
983 read_unlock(&dev_base_lock);
984
985 return addr;
986 }
987
988 /*
989 * Device notifier
990 */
991
992 int register_inetaddr_notifier(struct notifier_block *nb)
993 {
994 return blocking_notifier_chain_register(&inetaddr_chain, nb);
995 }
996
997 int unregister_inetaddr_notifier(struct notifier_block *nb)
998 {
999 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1000 }
1001
1002 /* Rename ifa_labels for a device name change. Make some effort to preserve existing
1003 * alias numbering and to create unique labels if possible.
1004 */
1005 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1006 {
1007 struct in_ifaddr *ifa;
1008 int named = 0;
1009
1010 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1011 char old[IFNAMSIZ], *dot;
1012
1013 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1014 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1015 if (named++ == 0)
1016 continue;
1017 dot = strchr(old, ':');
1018 if (dot == NULL) {
1019 sprintf(old, ":%d", named);
1020 dot = old;
1021 }
1022 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) {
1023 strcat(ifa->ifa_label, dot);
1024 } else {
1025 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1026 }
1027 }
1028 }
1029
1030 /* Called only under RTNL semaphore */
1031
1032 static int inetdev_event(struct notifier_block *this, unsigned long event,
1033 void *ptr)
1034 {
1035 struct net_device *dev = ptr;
1036 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1037
1038 ASSERT_RTNL();
1039
1040 if (!in_dev) {
1041 if (event == NETDEV_REGISTER) {
1042 in_dev = inetdev_init(dev);
1043 if (!in_dev)
1044 return notifier_from_errno(-ENOMEM);
1045 if (dev->flags & IFF_LOOPBACK) {
1046 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1047 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1048 }
1049 }
1050 goto out;
1051 }
1052
1053 switch (event) {
1054 case NETDEV_REGISTER:
1055 printk(KERN_DEBUG "inetdev_event: bug\n");
1056 dev->ip_ptr = NULL;
1057 break;
1058 case NETDEV_UP:
1059 if (dev->mtu < 68)
1060 break;
1061 if (dev->flags & IFF_LOOPBACK) {
1062 struct in_ifaddr *ifa;
1063 if ((ifa = inet_alloc_ifa()) != NULL) {
1064 ifa->ifa_local =
1065 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1066 ifa->ifa_prefixlen = 8;
1067 ifa->ifa_mask = inet_make_mask(8);
1068 in_dev_hold(in_dev);
1069 ifa->ifa_dev = in_dev;
1070 ifa->ifa_scope = RT_SCOPE_HOST;
1071 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1072 inet_insert_ifa(ifa);
1073 }
1074 }
1075 ip_mc_up(in_dev);
1076 break;
1077 case NETDEV_DOWN:
1078 ip_mc_down(in_dev);
1079 break;
1080 case NETDEV_CHANGEMTU:
1081 if (dev->mtu >= 68)
1082 break;
1083 /* MTU falled under 68, disable IP */
1084 case NETDEV_UNREGISTER:
1085 inetdev_destroy(in_dev);
1086 break;
1087 case NETDEV_CHANGENAME:
1088 /* Do not notify about label change, this event is
1089 * not interesting to applications using netlink.
1090 */
1091 inetdev_changename(dev, in_dev);
1092
1093 devinet_sysctl_unregister(in_dev);
1094 devinet_sysctl_register(in_dev);
1095 break;
1096 }
1097 out:
1098 return NOTIFY_DONE;
1099 }
1100
1101 static struct notifier_block ip_netdev_notifier = {
1102 .notifier_call =inetdev_event,
1103 };
1104
1105 static inline size_t inet_nlmsg_size(void)
1106 {
1107 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1108 + nla_total_size(4) /* IFA_ADDRESS */
1109 + nla_total_size(4) /* IFA_LOCAL */
1110 + nla_total_size(4) /* IFA_BROADCAST */
1111 + nla_total_size(IFNAMSIZ); /* IFA_LABEL */
1112 }
1113
1114 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1115 u32 pid, u32 seq, int event, unsigned int flags)
1116 {
1117 struct ifaddrmsg *ifm;
1118 struct nlmsghdr *nlh;
1119
1120 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
1121 if (nlh == NULL)
1122 return -EMSGSIZE;
1123
1124 ifm = nlmsg_data(nlh);
1125 ifm->ifa_family = AF_INET;
1126 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1127 ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
1128 ifm->ifa_scope = ifa->ifa_scope;
1129 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1130
1131 if (ifa->ifa_address)
1132 NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address);
1133
1134 if (ifa->ifa_local)
1135 NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local);
1136
1137 if (ifa->ifa_broadcast)
1138 NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast);
1139
1140 if (ifa->ifa_label[0])
1141 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
1142
1143 return nlmsg_end(skb, nlh);
1144
1145 nla_put_failure:
1146 nlmsg_cancel(skb, nlh);
1147 return -EMSGSIZE;
1148 }
1149
1150 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1151 {
1152 struct net *net = sock_net(skb->sk);
1153 int idx, ip_idx;
1154 struct net_device *dev;
1155 struct in_device *in_dev;
1156 struct in_ifaddr *ifa;
1157 int s_ip_idx, s_idx = cb->args[0];
1158
1159 s_ip_idx = ip_idx = cb->args[1];
1160 idx = 0;
1161 for_each_netdev(net, dev) {
1162 if (idx < s_idx)
1163 goto cont;
1164 if (idx > s_idx)
1165 s_ip_idx = 0;
1166 if ((in_dev = __in_dev_get_rtnl(dev)) == NULL)
1167 goto cont;
1168
1169 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1170 ifa = ifa->ifa_next, ip_idx++) {
1171 if (ip_idx < s_ip_idx)
1172 continue;
1173 if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
1174 cb->nlh->nlmsg_seq,
1175 RTM_NEWADDR, NLM_F_MULTI) <= 0)
1176 goto done;
1177 }
1178 cont:
1179 idx++;
1180 }
1181
1182 done:
1183 cb->args[0] = idx;
1184 cb->args[1] = ip_idx;
1185
1186 return skb->len;
1187 }
1188
1189 static void rtmsg_ifa(int event, struct in_ifaddr* ifa, struct nlmsghdr *nlh,
1190 u32 pid)
1191 {
1192 struct sk_buff *skb;
1193 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1194 int err = -ENOBUFS;
1195 struct net *net;
1196
1197 net = dev_net(ifa->ifa_dev->dev);
1198 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1199 if (skb == NULL)
1200 goto errout;
1201
1202 err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0);
1203 if (err < 0) {
1204 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1205 WARN_ON(err == -EMSGSIZE);
1206 kfree_skb(skb);
1207 goto errout;
1208 }
1209 err = rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1210 errout:
1211 if (err < 0)
1212 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1213 }
1214
1215 #ifdef CONFIG_SYSCTL
1216
1217 static void devinet_copy_dflt_conf(struct net *net, int i)
1218 {
1219 struct net_device *dev;
1220
1221 read_lock(&dev_base_lock);
1222 for_each_netdev(net, dev) {
1223 struct in_device *in_dev;
1224 rcu_read_lock();
1225 in_dev = __in_dev_get_rcu(dev);
1226 if (in_dev && !test_bit(i, in_dev->cnf.state))
1227 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
1228 rcu_read_unlock();
1229 }
1230 read_unlock(&dev_base_lock);
1231 }
1232
1233 static void inet_forward_change(struct net *net)
1234 {
1235 struct net_device *dev;
1236 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
1237
1238 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
1239 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
1240
1241 read_lock(&dev_base_lock);
1242 for_each_netdev(net, dev) {
1243 struct in_device *in_dev;
1244 rcu_read_lock();
1245 in_dev = __in_dev_get_rcu(dev);
1246 if (in_dev)
1247 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
1248 rcu_read_unlock();
1249 }
1250 read_unlock(&dev_base_lock);
1251
1252 rt_cache_flush(0);
1253 }
1254
1255 static int devinet_conf_proc(ctl_table *ctl, int write,
1256 struct file* filp, void __user *buffer,
1257 size_t *lenp, loff_t *ppos)
1258 {
1259 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1260
1261 if (write) {
1262 struct ipv4_devconf *cnf = ctl->extra1;
1263 struct net *net = ctl->extra2;
1264 int i = (int *)ctl->data - cnf->data;
1265
1266 set_bit(i, cnf->state);
1267
1268 if (cnf == net->ipv4.devconf_dflt)
1269 devinet_copy_dflt_conf(net, 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 struct net *net;
1281 int *valp = table->data;
1282 int new;
1283 int i;
1284
1285 if (!newval || !newlen)
1286 return 0;
1287
1288 if (newlen != sizeof(int))
1289 return -EINVAL;
1290
1291 if (get_user(new, (int __user *)newval))
1292 return -EFAULT;
1293
1294 if (new == *valp)
1295 return 0;
1296
1297 if (oldval && oldlenp) {
1298 size_t len;
1299
1300 if (get_user(len, oldlenp))
1301 return -EFAULT;
1302
1303 if (len) {
1304 if (len > table->maxlen)
1305 len = table->maxlen;
1306 if (copy_to_user(oldval, valp, len))
1307 return -EFAULT;
1308 if (put_user(len, oldlenp))
1309 return -EFAULT;
1310 }
1311 }
1312
1313 *valp = new;
1314
1315 cnf = table->extra1;
1316 net = table->extra2;
1317 i = (int *)table->data - cnf->data;
1318
1319 set_bit(i, cnf->state);
1320
1321 if (cnf == net->ipv4.devconf_dflt)
1322 devinet_copy_dflt_conf(net, i);
1323
1324 return 1;
1325 }
1326
1327 static int devinet_sysctl_forward(ctl_table *ctl, int write,
1328 struct file* filp, void __user *buffer,
1329 size_t *lenp, loff_t *ppos)
1330 {
1331 int *valp = ctl->data;
1332 int val = *valp;
1333 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1334
1335 if (write && *valp != val) {
1336 struct net *net = ctl->extra2;
1337
1338 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING))
1339 inet_forward_change(net);
1340 else if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING))
1341 rt_cache_flush(0);
1342 }
1343
1344 return ret;
1345 }
1346
1347 int ipv4_doint_and_flush(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 rt_cache_flush(0);
1357
1358 return ret;
1359 }
1360
1361 int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen,
1362 void __user *oldval, size_t __user *oldlenp,
1363 void __user *newval, size_t newlen)
1364 {
1365 int ret = devinet_conf_sysctl(table, name, nlen, oldval, oldlenp,
1366 newval, newlen);
1367
1368 if (ret == 1)
1369 rt_cache_flush(0);
1370
1371 return ret;
1372 }
1373
1374
1375 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc, sysctl) \
1376 { \
1377 .ctl_name = NET_IPV4_CONF_ ## attr, \
1378 .procname = name, \
1379 .data = ipv4_devconf.data + \
1380 NET_IPV4_CONF_ ## attr - 1, \
1381 .maxlen = sizeof(int), \
1382 .mode = mval, \
1383 .proc_handler = proc, \
1384 .strategy = sysctl, \
1385 .extra1 = &ipv4_devconf, \
1386 }
1387
1388 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
1389 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc, \
1390 devinet_conf_sysctl)
1391
1392 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
1393 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc, \
1394 devinet_conf_sysctl)
1395
1396 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc, sysctl) \
1397 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc, sysctl)
1398
1399 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
1400 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush, \
1401 ipv4_doint_and_flush_strategy)
1402
1403 static struct devinet_sysctl_table {
1404 struct ctl_table_header *sysctl_header;
1405 struct ctl_table devinet_vars[__NET_IPV4_CONF_MAX];
1406 char *dev_name;
1407 } devinet_sysctl = {
1408 .devinet_vars = {
1409 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
1410 devinet_sysctl_forward,
1411 devinet_conf_sysctl),
1412 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
1413
1414 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
1415 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
1416 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
1417 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
1418 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
1419 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
1420 "accept_source_route"),
1421 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
1422 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
1423 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
1424 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
1425 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
1426 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
1427 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
1428 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
1429 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
1430
1431 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
1432 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
1433 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
1434 "force_igmp_version"),
1435 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
1436 "promote_secondaries"),
1437 },
1438 };
1439
1440 static int __devinet_sysctl_register(struct net *net, char *dev_name,
1441 int ctl_name, struct ipv4_devconf *p)
1442 {
1443 int i;
1444 struct devinet_sysctl_table *t;
1445
1446 #define DEVINET_CTL_PATH_DEV 3
1447
1448 struct ctl_path devinet_ctl_path[] = {
1449 { .procname = "net", .ctl_name = CTL_NET, },
1450 { .procname = "ipv4", .ctl_name = NET_IPV4, },
1451 { .procname = "conf", .ctl_name = NET_IPV4_CONF, },
1452 { /* to be set */ },
1453 { },
1454 };
1455
1456 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1457 if (!t)
1458 goto out;
1459
1460 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
1461 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
1462 t->devinet_vars[i].extra1 = p;
1463 t->devinet_vars[i].extra2 = net;
1464 }
1465
1466 /*
1467 * Make a copy of dev_name, because '.procname' is regarded as const
1468 * by sysctl and we wouldn't want anyone to change it under our feet
1469 * (see SIOCSIFNAME).
1470 */
1471 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
1472 if (!t->dev_name)
1473 goto free;
1474
1475 devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name;
1476 devinet_ctl_path[DEVINET_CTL_PATH_DEV].ctl_name = ctl_name;
1477
1478 t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path,
1479 t->devinet_vars);
1480 if (!t->sysctl_header)
1481 goto free_procname;
1482
1483 p->sysctl = t;
1484 return 0;
1485
1486 free_procname:
1487 kfree(t->dev_name);
1488 free:
1489 kfree(t);
1490 out:
1491 return -ENOBUFS;
1492 }
1493
1494 static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
1495 {
1496 struct devinet_sysctl_table *t = cnf->sysctl;
1497
1498 if (t == NULL)
1499 return;
1500
1501 cnf->sysctl = NULL;
1502 unregister_sysctl_table(t->sysctl_header);
1503 kfree(t->dev_name);
1504 kfree(t);
1505 }
1506
1507 static void devinet_sysctl_register(struct in_device *idev)
1508 {
1509 neigh_sysctl_register(idev->dev, idev->arp_parms, NET_IPV4,
1510 NET_IPV4_NEIGH, "ipv4", NULL, NULL);
1511 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
1512 idev->dev->ifindex, &idev->cnf);
1513 }
1514
1515 static void devinet_sysctl_unregister(struct in_device *idev)
1516 {
1517 __devinet_sysctl_unregister(&idev->cnf);
1518 neigh_sysctl_unregister(idev->arp_parms);
1519 }
1520
1521 static struct ctl_table ctl_forward_entry[] = {
1522 {
1523 .ctl_name = NET_IPV4_FORWARD,
1524 .procname = "ip_forward",
1525 .data = &ipv4_devconf.data[
1526 NET_IPV4_CONF_FORWARDING - 1],
1527 .maxlen = sizeof(int),
1528 .mode = 0644,
1529 .proc_handler = devinet_sysctl_forward,
1530 .strategy = devinet_conf_sysctl,
1531 .extra1 = &ipv4_devconf,
1532 .extra2 = &init_net,
1533 },
1534 { },
1535 };
1536
1537 static __net_initdata struct ctl_path net_ipv4_path[] = {
1538 { .procname = "net", .ctl_name = CTL_NET, },
1539 { .procname = "ipv4", .ctl_name = NET_IPV4, },
1540 { },
1541 };
1542 #endif
1543
1544 static __net_init int devinet_init_net(struct net *net)
1545 {
1546 int err;
1547 struct ipv4_devconf *all, *dflt;
1548 #ifdef CONFIG_SYSCTL
1549 struct ctl_table *tbl = ctl_forward_entry;
1550 struct ctl_table_header *forw_hdr;
1551 #endif
1552
1553 err = -ENOMEM;
1554 all = &ipv4_devconf;
1555 dflt = &ipv4_devconf_dflt;
1556
1557 if (net != &init_net) {
1558 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
1559 if (all == NULL)
1560 goto err_alloc_all;
1561
1562 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
1563 if (dflt == NULL)
1564 goto err_alloc_dflt;
1565
1566 #ifdef CONFIG_SYSCTL
1567 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
1568 if (tbl == NULL)
1569 goto err_alloc_ctl;
1570
1571 tbl[0].data = &all->data[NET_IPV4_CONF_FORWARDING - 1];
1572 tbl[0].extra1 = all;
1573 tbl[0].extra2 = net;
1574 #endif
1575 }
1576
1577 #ifdef CONFIG_SYSCTL
1578 err = __devinet_sysctl_register(net, "all",
1579 NET_PROTO_CONF_ALL, all);
1580 if (err < 0)
1581 goto err_reg_all;
1582
1583 err = __devinet_sysctl_register(net, "default",
1584 NET_PROTO_CONF_DEFAULT, dflt);
1585 if (err < 0)
1586 goto err_reg_dflt;
1587
1588 err = -ENOMEM;
1589 forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl);
1590 if (forw_hdr == NULL)
1591 goto err_reg_ctl;
1592 net->ipv4.forw_hdr = forw_hdr;
1593 #endif
1594
1595 net->ipv4.devconf_all = all;
1596 net->ipv4.devconf_dflt = dflt;
1597 return 0;
1598
1599 #ifdef CONFIG_SYSCTL
1600 err_reg_ctl:
1601 __devinet_sysctl_unregister(dflt);
1602 err_reg_dflt:
1603 __devinet_sysctl_unregister(all);
1604 err_reg_all:
1605 if (tbl != ctl_forward_entry)
1606 kfree(tbl);
1607 err_alloc_ctl:
1608 #endif
1609 if (dflt != &ipv4_devconf_dflt)
1610 kfree(dflt);
1611 err_alloc_dflt:
1612 if (all != &ipv4_devconf)
1613 kfree(all);
1614 err_alloc_all:
1615 return err;
1616 }
1617
1618 static __net_exit void devinet_exit_net(struct net *net)
1619 {
1620 #ifdef CONFIG_SYSCTL
1621 struct ctl_table *tbl;
1622
1623 tbl = net->ipv4.forw_hdr->ctl_table_arg;
1624 unregister_net_sysctl_table(net->ipv4.forw_hdr);
1625 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
1626 __devinet_sysctl_unregister(net->ipv4.devconf_all);
1627 kfree(tbl);
1628 #endif
1629 kfree(net->ipv4.devconf_dflt);
1630 kfree(net->ipv4.devconf_all);
1631 }
1632
1633 static __net_initdata struct pernet_operations devinet_ops = {
1634 .init = devinet_init_net,
1635 .exit = devinet_exit_net,
1636 };
1637
1638 void __init devinet_init(void)
1639 {
1640 register_pernet_subsys(&devinet_ops);
1641
1642 register_gifconf(PF_INET, inet_gifconf);
1643 register_netdevice_notifier(&ip_netdev_notifier);
1644
1645 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL);
1646 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL);
1647 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr);
1648 }
1649
1650 EXPORT_SYMBOL(in_dev_finish_destroy);
1651 EXPORT_SYMBOL(inet_select_addr);
1652 EXPORT_SYMBOL(inetdev_by_index);
1653 EXPORT_SYMBOL(register_inetaddr_notifier);
1654 EXPORT_SYMBOL(unregister_inetaddr_notifier);
kernel-based virtual machine