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xen mmu: fix a race window causing leave_mm BUG()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv4 / devinet.c
blob036652c8166d7cd541d5c3bb3b2af46e84779c48
1 /*
2 * NET3 IP device support routines.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Derived from the IP parts of dev.c 1.0.19
10 * Authors: Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
13 *
14 * Additional Authors:
15 * Alan Cox, <gw4pts@gw4pts.ampr.org>
16 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
17 *
18 * Changes:
19 * Alexey Kuznetsov: pa_* fields are replaced with ifaddr
20 * lists.
21 * Cyrus Durgin: updated for kmod
22 * Matthias Andree: in devinet_ioctl, compare label and
23 * address (4.4BSD alias style support),
24 * fall back to comparing just the label
25 * if no match found.
26 */
27
28
29 #include <asm/uaccess.h>
30 #include <asm/system.h>
31 #include <linux/bitops.h>
32 #include <linux/capability.h>
33 #include <linux/module.h>
34 #include <linux/types.h>
35 #include <linux/kernel.h>
36 #include <linux/string.h>
37 #include <linux/mm.h>
38 #include <linux/socket.h>
39 #include <linux/sockios.h>
40 #include <linux/in.h>
41 #include <linux/errno.h>
42 #include <linux/interrupt.h>
43 #include <linux/if_addr.h>
44 #include <linux/if_ether.h>
45 #include <linux/inet.h>
46 #include <linux/netdevice.h>
47 #include <linux/etherdevice.h>
48 #include <linux/skbuff.h>
49 #include <linux/init.h>
50 #include <linux/notifier.h>
51 #include <linux/inetdevice.h>
52 #include <linux/igmp.h>
53 #include <linux/slab.h>
54 #ifdef CONFIG_SYSCTL
55 #include <linux/sysctl.h>
56 #endif
57 #include <linux/kmod.h>
58
59 #include <net/arp.h>
60 #include <net/ip.h>
61 #include <net/route.h>
62 #include <net/ip_fib.h>
63 #include <net/rtnetlink.h>
64 #include <net/net_namespace.h>
65
66 static struct ipv4_devconf ipv4_devconf = {
67 .data = {
68 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
69 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
70 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
71 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
72 },
73 };
74
75 static struct ipv4_devconf ipv4_devconf_dflt = {
76 .data = {
77 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
78 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
79 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
80 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
81 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
82 },
83 };
84
85 #define IPV4_DEVCONF_DFLT(net, attr) \
86 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
87
88 static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
89 [IFA_LOCAL] = { .type = NLA_U32 },
90 [IFA_ADDRESS] = { .type = NLA_U32 },
91 [IFA_BROADCAST] = { .type = NLA_U32 },
92 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
93 };
94
95 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
96
97 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
98 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
99 int destroy);
100 #ifdef CONFIG_SYSCTL
101 static void devinet_sysctl_register(struct in_device *idev);
102 static void devinet_sysctl_unregister(struct in_device *idev);
103 #else
104 static inline void devinet_sysctl_register(struct in_device *idev)
105 {
106 }
107 static inline void devinet_sysctl_unregister(struct in_device *idev)
108 {
109 }
110 #endif
111
112 /* Locks all the inet devices. */
113
114 static struct in_ifaddr *inet_alloc_ifa(void)
115 {
116 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
117 }
118
119 static void inet_rcu_free_ifa(struct rcu_head *head)
120 {
121 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
122 if (ifa->ifa_dev)
123 in_dev_put(ifa->ifa_dev);
124 kfree(ifa);
125 }
126
127 static inline void inet_free_ifa(struct in_ifaddr *ifa)
128 {
129 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
130 }
131
132 void in_dev_finish_destroy(struct in_device *idev)
133 {
134 struct net_device *dev = idev->dev;
135
136 WARN_ON(idev->ifa_list);
137 WARN_ON(idev->mc_list);
138 #ifdef NET_REFCNT_DEBUG
139 printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n",
140 idev, dev ? dev->name : "NIL");
141 #endif
142 dev_put(dev);
143 if (!idev->dead)
144 pr_err("Freeing alive in_device %p\n", idev);
145 else
146 kfree(idev);
147 }
148 EXPORT_SYMBOL(in_dev_finish_destroy);
149
150 static struct in_device *inetdev_init(struct net_device *dev)
151 {
152 struct in_device *in_dev;
153
154 ASSERT_RTNL();
155
156 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
157 if (!in_dev)
158 goto out;
159 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
160 sizeof(in_dev->cnf));
161 in_dev->cnf.sysctl = NULL;
162 in_dev->dev = dev;
163 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
164 if (!in_dev->arp_parms)
165 goto out_kfree;
166 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
167 dev_disable_lro(dev);
168 /* Reference in_dev->dev */
169 dev_hold(dev);
170 /* Account for reference dev->ip_ptr (below) */
171 in_dev_hold(in_dev);
172
173 devinet_sysctl_register(in_dev);
174 ip_mc_init_dev(in_dev);
175 if (dev->flags & IFF_UP)
176 ip_mc_up(in_dev);
177
178 /* we can receive as soon as ip_ptr is set -- do this last */
179 rcu_assign_pointer(dev->ip_ptr, in_dev);
180 out:
181 return in_dev;
182 out_kfree:
183 kfree(in_dev);
184 in_dev = NULL;
185 goto out;
186 }
187
188 static void in_dev_rcu_put(struct rcu_head *head)
189 {
190 struct in_device *idev = container_of(head, struct in_device, rcu_head);
191 in_dev_put(idev);
192 }
193
194 static void inetdev_destroy(struct in_device *in_dev)
195 {
196 struct in_ifaddr *ifa;
197 struct net_device *dev;
198
199 ASSERT_RTNL();
200
201 dev = in_dev->dev;
202
203 in_dev->dead = 1;
204
205 ip_mc_destroy_dev(in_dev);
206
207 while ((ifa = in_dev->ifa_list) != NULL) {
208 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
209 inet_free_ifa(ifa);
210 }
211
212 rcu_assign_pointer(dev->ip_ptr, NULL);
213
214 devinet_sysctl_unregister(in_dev);
215 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
216 arp_ifdown(dev);
217
218 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
219 }
220
221 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
222 {
223 rcu_read_lock();
224 for_primary_ifa(in_dev) {
225 if (inet_ifa_match(a, ifa)) {
226 if (!b || inet_ifa_match(b, ifa)) {
227 rcu_read_unlock();
228 return 1;
229 }
230 }
231 } endfor_ifa(in_dev);
232 rcu_read_unlock();
233 return 0;
234 }
235
236 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
237 int destroy, struct nlmsghdr *nlh, u32 pid)
238 {
239 struct in_ifaddr *promote = NULL;
240 struct in_ifaddr *ifa, *ifa1 = *ifap;
241 struct in_ifaddr *last_prim = in_dev->ifa_list;
242 struct in_ifaddr *prev_prom = NULL;
243 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
244
245 ASSERT_RTNL();
246
247 /* 1. Deleting primary ifaddr forces deletion all secondaries
248 * unless alias promotion is set
249 **/
250
251 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
252 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
253
254 while ((ifa = *ifap1) != NULL) {
255 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
256 ifa1->ifa_scope <= ifa->ifa_scope)
257 last_prim = ifa;
258
259 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
260 ifa1->ifa_mask != ifa->ifa_mask ||
261 !inet_ifa_match(ifa1->ifa_address, ifa)) {
262 ifap1 = &ifa->ifa_next;
263 prev_prom = ifa;
264 continue;
265 }
266
267 if (!do_promote) {
268 *ifap1 = ifa->ifa_next;
269
270 rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid);
271 blocking_notifier_call_chain(&inetaddr_chain,
272 NETDEV_DOWN, ifa);
273 inet_free_ifa(ifa);
274 } else {
275 promote = ifa;
276 break;
277 }
278 }
279 }
280
281 /* 2. Unlink it */
282
283 *ifap = ifa1->ifa_next;
284
285 /* 3. Announce address deletion */
286
287 /* Send message first, then call notifier.
288 At first sight, FIB update triggered by notifier
289 will refer to already deleted ifaddr, that could confuse
290 netlink listeners. It is not true: look, gated sees
291 that route deleted and if it still thinks that ifaddr
292 is valid, it will try to restore deleted routes... Grr.
293 So that, this order is correct.
294 */
295 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid);
296 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
297
298 if (promote) {
299
300 if (prev_prom) {
301 prev_prom->ifa_next = promote->ifa_next;
302 promote->ifa_next = last_prim->ifa_next;
303 last_prim->ifa_next = promote;
304 }
305
306 promote->ifa_flags &= ~IFA_F_SECONDARY;
307 rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid);
308 blocking_notifier_call_chain(&inetaddr_chain,
309 NETDEV_UP, promote);
310 for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) {
311 if (ifa1->ifa_mask != ifa->ifa_mask ||
312 !inet_ifa_match(ifa1->ifa_address, ifa))
313 continue;
314 fib_add_ifaddr(ifa);
315 }
316
317 }
318 if (destroy)
319 inet_free_ifa(ifa1);
320 }
321
322 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
323 int destroy)
324 {
325 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
326 }
327
328 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
329 u32 pid)
330 {
331 struct in_device *in_dev = ifa->ifa_dev;
332 struct in_ifaddr *ifa1, **ifap, **last_primary;
333
334 ASSERT_RTNL();
335
336 if (!ifa->ifa_local) {
337 inet_free_ifa(ifa);
338 return 0;
339 }
340
341 ifa->ifa_flags &= ~IFA_F_SECONDARY;
342 last_primary = &in_dev->ifa_list;
343
344 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
345 ifap = &ifa1->ifa_next) {
346 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
347 ifa->ifa_scope <= ifa1->ifa_scope)
348 last_primary = &ifa1->ifa_next;
349 if (ifa1->ifa_mask == ifa->ifa_mask &&
350 inet_ifa_match(ifa1->ifa_address, ifa)) {
351 if (ifa1->ifa_local == ifa->ifa_local) {
352 inet_free_ifa(ifa);
353 return -EEXIST;
354 }
355 if (ifa1->ifa_scope != ifa->ifa_scope) {
356 inet_free_ifa(ifa);
357 return -EINVAL;
358 }
359 ifa->ifa_flags |= IFA_F_SECONDARY;
360 }
361 }
362
363 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
364 net_srandom(ifa->ifa_local);
365 ifap = last_primary;
366 }
367
368 ifa->ifa_next = *ifap;
369 *ifap = ifa;
370
371 /* Send message first, then call notifier.
372 Notifier will trigger FIB update, so that
373 listeners of netlink will know about new ifaddr */
374 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid);
375 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
376
377 return 0;
378 }
379
380 static int inet_insert_ifa(struct in_ifaddr *ifa)
381 {
382 return __inet_insert_ifa(ifa, NULL, 0);
383 }
384
385 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
386 {
387 struct in_device *in_dev = __in_dev_get_rtnl(dev);
388
389 ASSERT_RTNL();
390
391 if (!in_dev) {
392 inet_free_ifa(ifa);
393 return -ENOBUFS;
394 }
395 ipv4_devconf_setall(in_dev);
396 if (ifa->ifa_dev != in_dev) {
397 WARN_ON(ifa->ifa_dev);
398 in_dev_hold(in_dev);
399 ifa->ifa_dev = in_dev;
400 }
401 if (ipv4_is_loopback(ifa->ifa_local))
402 ifa->ifa_scope = RT_SCOPE_HOST;
403 return inet_insert_ifa(ifa);
404 }
405
406 /* Caller must hold RCU or RTNL :
407 * We dont take a reference on found in_device
408 */
409 struct in_device *inetdev_by_index(struct net *net, int ifindex)
410 {
411 struct net_device *dev;
412 struct in_device *in_dev = NULL;
413
414 rcu_read_lock();
415 dev = dev_get_by_index_rcu(net, ifindex);
416 if (dev)
417 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
418 rcu_read_unlock();
419 return in_dev;
420 }
421 EXPORT_SYMBOL(inetdev_by_index);
422
423 /* Called only from RTNL semaphored context. No locks. */
424
425 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
426 __be32 mask)
427 {
428 ASSERT_RTNL();
429
430 for_primary_ifa(in_dev) {
431 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
432 return ifa;
433 } endfor_ifa(in_dev);
434 return NULL;
435 }
436
437 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
438 {
439 struct net *net = sock_net(skb->sk);
440 struct nlattr *tb[IFA_MAX+1];
441 struct in_device *in_dev;
442 struct ifaddrmsg *ifm;
443 struct in_ifaddr *ifa, **ifap;
444 int err = -EINVAL;
445
446 ASSERT_RTNL();
447
448 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
449 if (err < 0)
450 goto errout;
451
452 ifm = nlmsg_data(nlh);
453 in_dev = inetdev_by_index(net, ifm->ifa_index);
454 if (in_dev == NULL) {
455 err = -ENODEV;
456 goto errout;
457 }
458
459 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
460 ifap = &ifa->ifa_next) {
461 if (tb[IFA_LOCAL] &&
462 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
463 continue;
464
465 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
466 continue;
467
468 if (tb[IFA_ADDRESS] &&
469 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
470 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
471 continue;
472
473 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid);
474 return 0;
475 }
476
477 err = -EADDRNOTAVAIL;
478 errout:
479 return err;
480 }
481
482 static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh)
483 {
484 struct nlattr *tb[IFA_MAX+1];
485 struct in_ifaddr *ifa;
486 struct ifaddrmsg *ifm;
487 struct net_device *dev;
488 struct in_device *in_dev;
489 int err;
490
491 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
492 if (err < 0)
493 goto errout;
494
495 ifm = nlmsg_data(nlh);
496 err = -EINVAL;
497 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
498 goto errout;
499
500 dev = __dev_get_by_index(net, ifm->ifa_index);
501 err = -ENODEV;
502 if (dev == NULL)
503 goto errout;
504
505 in_dev = __in_dev_get_rtnl(dev);
506 err = -ENOBUFS;
507 if (in_dev == NULL)
508 goto errout;
509
510 ifa = inet_alloc_ifa();
511 if (ifa == NULL)
512 /*
513 * A potential indev allocation can be left alive, it stays
514 * assigned to its device and is destroy with it.
515 */
516 goto errout;
517
518 ipv4_devconf_setall(in_dev);
519 in_dev_hold(in_dev);
520
521 if (tb[IFA_ADDRESS] == NULL)
522 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
523
524 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
525 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
526 ifa->ifa_flags = ifm->ifa_flags;
527 ifa->ifa_scope = ifm->ifa_scope;
528 ifa->ifa_dev = in_dev;
529
530 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
531 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
532
533 if (tb[IFA_BROADCAST])
534 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
535
536 if (tb[IFA_LABEL])
537 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
538 else
539 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
540
541 return ifa;
542
543 errout:
544 return ERR_PTR(err);
545 }
546
547 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
548 {
549 struct net *net = sock_net(skb->sk);
550 struct in_ifaddr *ifa;
551
552 ASSERT_RTNL();
553
554 ifa = rtm_to_ifaddr(net, nlh);
555 if (IS_ERR(ifa))
556 return PTR_ERR(ifa);
557
558 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid);
559 }
560
561 /*
562 * Determine a default network mask, based on the IP address.
563 */
564
565 static inline int inet_abc_len(__be32 addr)
566 {
567 int rc = -1; /* Something else, probably a multicast. */
568
569 if (ipv4_is_zeronet(addr))
570 rc = 0;
571 else {
572 __u32 haddr = ntohl(addr);
573
574 if (IN_CLASSA(haddr))
575 rc = 8;
576 else if (IN_CLASSB(haddr))
577 rc = 16;
578 else if (IN_CLASSC(haddr))
579 rc = 24;
580 }
581
582 return rc;
583 }
584
585
586 int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
587 {
588 struct ifreq ifr;
589 struct sockaddr_in sin_orig;
590 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
591 struct in_device *in_dev;
592 struct in_ifaddr **ifap = NULL;
593 struct in_ifaddr *ifa = NULL;
594 struct net_device *dev;
595 char *colon;
596 int ret = -EFAULT;
597 int tryaddrmatch = 0;
598
599 /*
600 * Fetch the caller's info block into kernel space
601 */
602
603 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
604 goto out;
605 ifr.ifr_name[IFNAMSIZ - 1] = 0;
606
607 /* save original address for comparison */
608 memcpy(&sin_orig, sin, sizeof(*sin));
609
610 colon = strchr(ifr.ifr_name, ':');
611 if (colon)
612 *colon = 0;
613
614 dev_load(net, ifr.ifr_name);
615
616 switch (cmd) {
617 case SIOCGIFADDR: /* Get interface address */
618 case SIOCGIFBRDADDR: /* Get the broadcast address */
619 case SIOCGIFDSTADDR: /* Get the destination address */
620 case SIOCGIFNETMASK: /* Get the netmask for the interface */
621 /* Note that these ioctls will not sleep,
622 so that we do not impose a lock.
623 One day we will be forced to put shlock here (I mean SMP)
624 */
625 tryaddrmatch = (sin_orig.sin_family == AF_INET);
626 memset(sin, 0, sizeof(*sin));
627 sin->sin_family = AF_INET;
628 break;
629
630 case SIOCSIFFLAGS:
631 ret = -EACCES;
632 if (!capable(CAP_NET_ADMIN))
633 goto out;
634 break;
635 case SIOCSIFADDR: /* Set interface address (and family) */
636 case SIOCSIFBRDADDR: /* Set the broadcast address */
637 case SIOCSIFDSTADDR: /* Set the destination address */
638 case SIOCSIFNETMASK: /* Set the netmask for the interface */
639 ret = -EACCES;
640 if (!capable(CAP_NET_ADMIN))
641 goto out;
642 ret = -EINVAL;
643 if (sin->sin_family != AF_INET)
644 goto out;
645 break;
646 default:
647 ret = -EINVAL;
648 goto out;
649 }
650
651 rtnl_lock();
652
653 ret = -ENODEV;
654 dev = __dev_get_by_name(net, ifr.ifr_name);
655 if (!dev)
656 goto done;
657
658 if (colon)
659 *colon = ':';
660
661 in_dev = __in_dev_get_rtnl(dev);
662 if (in_dev) {
663 if (tryaddrmatch) {
664 /* Matthias Andree */
665 /* compare label and address (4.4BSD style) */
666 /* note: we only do this for a limited set of ioctls
667 and only if the original address family was AF_INET.
668 This is checked above. */
669 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
670 ifap = &ifa->ifa_next) {
671 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
672 sin_orig.sin_addr.s_addr ==
673 ifa->ifa_local) {
674 break; /* found */
675 }
676 }
677 }
678 /* we didn't get a match, maybe the application is
679 4.3BSD-style and passed in junk so we fall back to
680 comparing just the label */
681 if (!ifa) {
682 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
683 ifap = &ifa->ifa_next)
684 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
685 break;
686 }
687 }
688
689 ret = -EADDRNOTAVAIL;
690 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
691 goto done;
692
693 switch (cmd) {
694 case SIOCGIFADDR: /* Get interface address */
695 sin->sin_addr.s_addr = ifa->ifa_local;
696 goto rarok;
697
698 case SIOCGIFBRDADDR: /* Get the broadcast address */
699 sin->sin_addr.s_addr = ifa->ifa_broadcast;
700 goto rarok;
701
702 case SIOCGIFDSTADDR: /* Get the destination address */
703 sin->sin_addr.s_addr = ifa->ifa_address;
704 goto rarok;
705
706 case SIOCGIFNETMASK: /* Get the netmask for the interface */
707 sin->sin_addr.s_addr = ifa->ifa_mask;
708 goto rarok;
709
710 case SIOCSIFFLAGS:
711 if (colon) {
712 ret = -EADDRNOTAVAIL;
713 if (!ifa)
714 break;
715 ret = 0;
716 if (!(ifr.ifr_flags & IFF_UP))
717 inet_del_ifa(in_dev, ifap, 1);
718 break;
719 }
720 ret = dev_change_flags(dev, ifr.ifr_flags);
721 break;
722
723 case SIOCSIFADDR: /* Set interface address (and family) */
724 ret = -EINVAL;
725 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
726 break;
727
728 if (!ifa) {
729 ret = -ENOBUFS;
730 ifa = inet_alloc_ifa();
731 if (!ifa)
732 break;
733 if (colon)
734 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
735 else
736 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
737 } else {
738 ret = 0;
739 if (ifa->ifa_local == sin->sin_addr.s_addr)
740 break;
741 inet_del_ifa(in_dev, ifap, 0);
742 ifa->ifa_broadcast = 0;
743 ifa->ifa_scope = 0;
744 }
745
746 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
747
748 if (!(dev->flags & IFF_POINTOPOINT)) {
749 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
750 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
751 if ((dev->flags & IFF_BROADCAST) &&
752 ifa->ifa_prefixlen < 31)
753 ifa->ifa_broadcast = ifa->ifa_address |
754 ~ifa->ifa_mask;
755 } else {
756 ifa->ifa_prefixlen = 32;
757 ifa->ifa_mask = inet_make_mask(32);
758 }
759 ret = inet_set_ifa(dev, ifa);
760 break;
761
762 case SIOCSIFBRDADDR: /* Set the broadcast address */
763 ret = 0;
764 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
765 inet_del_ifa(in_dev, ifap, 0);
766 ifa->ifa_broadcast = sin->sin_addr.s_addr;
767 inet_insert_ifa(ifa);
768 }
769 break;
770
771 case SIOCSIFDSTADDR: /* Set the destination address */
772 ret = 0;
773 if (ifa->ifa_address == sin->sin_addr.s_addr)
774 break;
775 ret = -EINVAL;
776 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
777 break;
778 ret = 0;
779 inet_del_ifa(in_dev, ifap, 0);
780 ifa->ifa_address = sin->sin_addr.s_addr;
781 inet_insert_ifa(ifa);
782 break;
783
784 case SIOCSIFNETMASK: /* Set the netmask for the interface */
785
786 /*
787 * The mask we set must be legal.
788 */
789 ret = -EINVAL;
790 if (bad_mask(sin->sin_addr.s_addr, 0))
791 break;
792 ret = 0;
793 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
794 __be32 old_mask = ifa->ifa_mask;
795 inet_del_ifa(in_dev, ifap, 0);
796 ifa->ifa_mask = sin->sin_addr.s_addr;
797 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
798
799 /* See if current broadcast address matches
800 * with current netmask, then recalculate
801 * the broadcast address. Otherwise it's a
802 * funny address, so don't touch it since
803 * the user seems to know what (s)he's doing...
804 */
805 if ((dev->flags & IFF_BROADCAST) &&
806 (ifa->ifa_prefixlen < 31) &&
807 (ifa->ifa_broadcast ==
808 (ifa->ifa_local|~old_mask))) {
809 ifa->ifa_broadcast = (ifa->ifa_local |
810 ~sin->sin_addr.s_addr);
811 }
812 inet_insert_ifa(ifa);
813 }
814 break;
815 }
816 done:
817 rtnl_unlock();
818 out:
819 return ret;
820 rarok:
821 rtnl_unlock();
822 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
823 goto out;
824 }
825
826 static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
827 {
828 struct in_device *in_dev = __in_dev_get_rtnl(dev);
829 struct in_ifaddr *ifa;
830 struct ifreq ifr;
831 int done = 0;
832
833 if (!in_dev)
834 goto out;
835
836 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
837 if (!buf) {
838 done += sizeof(ifr);
839 continue;
840 }
841 if (len < (int) sizeof(ifr))
842 break;
843 memset(&ifr, 0, sizeof(struct ifreq));
844 if (ifa->ifa_label)
845 strcpy(ifr.ifr_name, ifa->ifa_label);
846 else
847 strcpy(ifr.ifr_name, dev->name);
848
849 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
850 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
851 ifa->ifa_local;
852
853 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
854 done = -EFAULT;
855 break;
856 }
857 buf += sizeof(struct ifreq);
858 len -= sizeof(struct ifreq);
859 done += sizeof(struct ifreq);
860 }
861 out:
862 return done;
863 }
864
865 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
866 {
867 __be32 addr = 0;
868 struct in_device *in_dev;
869 struct net *net = dev_net(dev);
870
871 rcu_read_lock();
872 in_dev = __in_dev_get_rcu(dev);
873 if (!in_dev)
874 goto no_in_dev;
875
876 for_primary_ifa(in_dev) {
877 if (ifa->ifa_scope > scope)
878 continue;
879 if (!dst || inet_ifa_match(dst, ifa)) {
880 addr = ifa->ifa_local;
881 break;
882 }
883 if (!addr)
884 addr = ifa->ifa_local;
885 } endfor_ifa(in_dev);
886
887 if (addr)
888 goto out_unlock;
889 no_in_dev:
890
891 /* Not loopback addresses on loopback should be preferred
892 in this case. It is importnat that lo is the first interface
893 in dev_base list.
894 */
895 for_each_netdev_rcu(net, dev) {
896 in_dev = __in_dev_get_rcu(dev);
897 if (!in_dev)
898 continue;
899
900 for_primary_ifa(in_dev) {
901 if (ifa->ifa_scope != RT_SCOPE_LINK &&
902 ifa->ifa_scope <= scope) {
903 addr = ifa->ifa_local;
904 goto out_unlock;
905 }
906 } endfor_ifa(in_dev);
907 }
908 out_unlock:
909 rcu_read_unlock();
910 return addr;
911 }
912 EXPORT_SYMBOL(inet_select_addr);
913
914 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
915 __be32 local, int scope)
916 {
917 int same = 0;
918 __be32 addr = 0;
919
920 for_ifa(in_dev) {
921 if (!addr &&
922 (local == ifa->ifa_local || !local) &&
923 ifa->ifa_scope <= scope) {
924 addr = ifa->ifa_local;
925 if (same)
926 break;
927 }
928 if (!same) {
929 same = (!local || inet_ifa_match(local, ifa)) &&
930 (!dst || inet_ifa_match(dst, ifa));
931 if (same && addr) {
932 if (local || !dst)
933 break;
934 /* Is the selected addr into dst subnet? */
935 if (inet_ifa_match(addr, ifa))
936 break;
937 /* No, then can we use new local src? */
938 if (ifa->ifa_scope <= scope) {
939 addr = ifa->ifa_local;
940 break;
941 }
942 /* search for large dst subnet for addr */
943 same = 0;
944 }
945 }
946 } endfor_ifa(in_dev);
947
948 return same ? addr : 0;
949 }
950
951 /*
952 * Confirm that local IP address exists using wildcards:
953 * - in_dev: only on this interface, 0=any interface
954 * - dst: only in the same subnet as dst, 0=any dst
955 * - local: address, 0=autoselect the local address
956 * - scope: maximum allowed scope value for the local address
957 */
958 __be32 inet_confirm_addr(struct in_device *in_dev,
959 __be32 dst, __be32 local, int scope)
960 {
961 __be32 addr = 0;
962 struct net_device *dev;
963 struct net *net;
964
965 if (scope != RT_SCOPE_LINK)
966 return confirm_addr_indev(in_dev, dst, local, scope);
967
968 net = dev_net(in_dev->dev);
969 rcu_read_lock();
970 for_each_netdev_rcu(net, dev) {
971 in_dev = __in_dev_get_rcu(dev);
972 if (in_dev) {
973 addr = confirm_addr_indev(in_dev, dst, local, scope);
974 if (addr)
975 break;
976 }
977 }
978 rcu_read_unlock();
979
980 return addr;
981 }
982
983 /*
984 * Device notifier
985 */
986
987 int register_inetaddr_notifier(struct notifier_block *nb)
988 {
989 return blocking_notifier_chain_register(&inetaddr_chain, nb);
990 }
991 EXPORT_SYMBOL(register_inetaddr_notifier);
992
993 int unregister_inetaddr_notifier(struct notifier_block *nb)
994 {
995 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
996 }
997 EXPORT_SYMBOL(unregister_inetaddr_notifier);
998
999 /* Rename ifa_labels for a device name change. Make some effort to preserve
1000 * existing alias numbering and to create unique labels if possible.
1001 */
1002 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1003 {
1004 struct in_ifaddr *ifa;
1005 int named = 0;
1006
1007 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1008 char old[IFNAMSIZ], *dot;
1009
1010 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1011 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1012 if (named++ == 0)
1013 goto skip;
1014 dot = strchr(old, ':');
1015 if (dot == NULL) {
1016 sprintf(old, ":%d", named);
1017 dot = old;
1018 }
1019 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1020 strcat(ifa->ifa_label, dot);
1021 else
1022 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1023 skip:
1024 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1025 }
1026 }
1027
1028 static inline bool inetdev_valid_mtu(unsigned mtu)
1029 {
1030 return mtu >= 68;
1031 }
1032
1033 static void inetdev_send_gratuitous_arp(struct net_device *dev,
1034 struct in_device *in_dev)
1035
1036 {
1037 struct in_ifaddr *ifa = in_dev->ifa_list;
1038
1039 if (!ifa)
1040 return;
1041
1042 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1043 ifa->ifa_local, dev,
1044 ifa->ifa_local, NULL,
1045 dev->dev_addr, NULL);
1046 }
1047
1048 /* Called only under RTNL semaphore */
1049
1050 static int inetdev_event(struct notifier_block *this, unsigned long event,
1051 void *ptr)
1052 {
1053 struct net_device *dev = ptr;
1054 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1055
1056 ASSERT_RTNL();
1057
1058 if (!in_dev) {
1059 if (event == NETDEV_REGISTER) {
1060 in_dev = inetdev_init(dev);
1061 if (!in_dev)
1062 return notifier_from_errno(-ENOMEM);
1063 if (dev->flags & IFF_LOOPBACK) {
1064 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1065 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1066 }
1067 } else if (event == NETDEV_CHANGEMTU) {
1068 /* Re-enabling IP */
1069 if (inetdev_valid_mtu(dev->mtu))
1070 in_dev = inetdev_init(dev);
1071 }
1072 goto out;
1073 }
1074
1075 switch (event) {
1076 case NETDEV_REGISTER:
1077 printk(KERN_DEBUG "inetdev_event: bug\n");
1078 rcu_assign_pointer(dev->ip_ptr, NULL);
1079 break;
1080 case NETDEV_UP:
1081 if (!inetdev_valid_mtu(dev->mtu))
1082 break;
1083 if (dev->flags & IFF_LOOPBACK) {
1084 struct in_ifaddr *ifa = inet_alloc_ifa();
1085
1086 if (ifa) {
1087 ifa->ifa_local =
1088 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1089 ifa->ifa_prefixlen = 8;
1090 ifa->ifa_mask = inet_make_mask(8);
1091 in_dev_hold(in_dev);
1092 ifa->ifa_dev = in_dev;
1093 ifa->ifa_scope = RT_SCOPE_HOST;
1094 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1095 inet_insert_ifa(ifa);
1096 }
1097 }
1098 ip_mc_up(in_dev);
1099 /* fall through */
1100 case NETDEV_CHANGEADDR:
1101 if (!IN_DEV_ARP_NOTIFY(in_dev))
1102 break;
1103 /* fall through */
1104 case NETDEV_NOTIFY_PEERS:
1105 /* Send gratuitous ARP to notify of link change */
1106 inetdev_send_gratuitous_arp(dev, in_dev);
1107 break;
1108 case NETDEV_DOWN:
1109 ip_mc_down(in_dev);
1110 break;
1111 case NETDEV_PRE_TYPE_CHANGE:
1112 ip_mc_unmap(in_dev);
1113 break;
1114 case NETDEV_POST_TYPE_CHANGE:
1115 ip_mc_remap(in_dev);
1116 break;
1117 case NETDEV_CHANGEMTU:
1118 if (inetdev_valid_mtu(dev->mtu))
1119 break;
1120 /* disable IP when MTU is not enough */
1121 case NETDEV_UNREGISTER:
1122 inetdev_destroy(in_dev);
1123 break;
1124 case NETDEV_CHANGENAME:
1125 /* Do not notify about label change, this event is
1126 * not interesting to applications using netlink.
1127 */
1128 inetdev_changename(dev, in_dev);
1129
1130 devinet_sysctl_unregister(in_dev);
1131 devinet_sysctl_register(in_dev);
1132 break;
1133 }
1134 out:
1135 return NOTIFY_DONE;
1136 }
1137
1138 static struct notifier_block ip_netdev_notifier = {
1139 .notifier_call = inetdev_event,
1140 };
1141
1142 static inline size_t inet_nlmsg_size(void)
1143 {
1144 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1145 + nla_total_size(4) /* IFA_ADDRESS */
1146 + nla_total_size(4) /* IFA_LOCAL */
1147 + nla_total_size(4) /* IFA_BROADCAST */
1148 + nla_total_size(IFNAMSIZ); /* IFA_LABEL */
1149 }
1150
1151 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1152 u32 pid, u32 seq, int event, unsigned int flags)
1153 {
1154 struct ifaddrmsg *ifm;
1155 struct nlmsghdr *nlh;
1156
1157 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
1158 if (nlh == NULL)
1159 return -EMSGSIZE;
1160
1161 ifm = nlmsg_data(nlh);
1162 ifm->ifa_family = AF_INET;
1163 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1164 ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
1165 ifm->ifa_scope = ifa->ifa_scope;
1166 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1167
1168 if (ifa->ifa_address)
1169 NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address);
1170
1171 if (ifa->ifa_local)
1172 NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local);
1173
1174 if (ifa->ifa_broadcast)
1175 NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast);
1176
1177 if (ifa->ifa_label[0])
1178 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
1179
1180 return nlmsg_end(skb, nlh);
1181
1182 nla_put_failure:
1183 nlmsg_cancel(skb, nlh);
1184 return -EMSGSIZE;
1185 }
1186
1187 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1188 {
1189 struct net *net = sock_net(skb->sk);
1190 int h, s_h;
1191 int idx, s_idx;
1192 int ip_idx, s_ip_idx;
1193 struct net_device *dev;
1194 struct in_device *in_dev;
1195 struct in_ifaddr *ifa;
1196 struct hlist_head *head;
1197 struct hlist_node *node;
1198
1199 s_h = cb->args[0];
1200 s_idx = idx = cb->args[1];
1201 s_ip_idx = ip_idx = cb->args[2];
1202
1203 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1204 idx = 0;
1205 head = &net->dev_index_head[h];
1206 rcu_read_lock();
1207 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
1208 if (idx < s_idx)
1209 goto cont;
1210 if (h > s_h || idx > s_idx)
1211 s_ip_idx = 0;
1212 in_dev = __in_dev_get_rcu(dev);
1213 if (!in_dev)
1214 goto cont;
1215
1216 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1217 ifa = ifa->ifa_next, ip_idx++) {
1218 if (ip_idx < s_ip_idx)
1219 continue;
1220 if (inet_fill_ifaddr(skb, ifa,
1221 NETLINK_CB(cb->skb).pid,
1222 cb->nlh->nlmsg_seq,
1223 RTM_NEWADDR, NLM_F_MULTI) <= 0) {
1224 rcu_read_unlock();
1225 goto done;
1226 }
1227 }
1228 cont:
1229 idx++;
1230 }
1231 rcu_read_unlock();
1232 }
1233
1234 done:
1235 cb->args[0] = h;
1236 cb->args[1] = idx;
1237 cb->args[2] = ip_idx;
1238
1239 return skb->len;
1240 }
1241
1242 static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1243 u32 pid)
1244 {
1245 struct sk_buff *skb;
1246 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1247 int err = -ENOBUFS;
1248 struct net *net;
1249
1250 net = dev_net(ifa->ifa_dev->dev);
1251 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1252 if (skb == NULL)
1253 goto errout;
1254
1255 err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0);
1256 if (err < 0) {
1257 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1258 WARN_ON(err == -EMSGSIZE);
1259 kfree_skb(skb);
1260 goto errout;
1261 }
1262 rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1263 return;
1264 errout:
1265 if (err < 0)
1266 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1267 }
1268
1269 static size_t inet_get_link_af_size(const struct net_device *dev)
1270 {
1271 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1272
1273 if (!in_dev)
1274 return 0;
1275
1276 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1277 }
1278
1279 static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
1280 {
1281 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1282 struct nlattr *nla;
1283 int i;
1284
1285 if (!in_dev)
1286 return -ENODATA;
1287
1288 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1289 if (nla == NULL)
1290 return -EMSGSIZE;
1291
1292 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1293 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1294
1295 return 0;
1296 }
1297
1298 static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1299 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1300 };
1301
1302 static int inet_validate_link_af(const struct net_device *dev,
1303 const struct nlattr *nla)
1304 {
1305 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1306 int err, rem;
1307
1308 if (dev && !__in_dev_get_rtnl(dev))
1309 return -EAFNOSUPPORT;
1310
1311 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
1312 if (err < 0)
1313 return err;
1314
1315 if (tb[IFLA_INET_CONF]) {
1316 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1317 int cfgid = nla_type(a);
1318
1319 if (nla_len(a) < 4)
1320 return -EINVAL;
1321
1322 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1323 return -EINVAL;
1324 }
1325 }
1326
1327 return 0;
1328 }
1329
1330 static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1331 {
1332 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1333 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1334 int rem;
1335
1336 if (!in_dev)
1337 return -EAFNOSUPPORT;
1338
1339 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0)
1340 BUG();
1341
1342 if (tb[IFLA_INET_CONF]) {
1343 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1344 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1345 }
1346
1347 return 0;
1348 }
1349
1350 #ifdef CONFIG_SYSCTL
1351
1352 static void devinet_copy_dflt_conf(struct net *net, int i)
1353 {
1354 struct net_device *dev;
1355
1356 rcu_read_lock();
1357 for_each_netdev_rcu(net, dev) {
1358 struct in_device *in_dev;
1359
1360 in_dev = __in_dev_get_rcu(dev);
1361 if (in_dev && !test_bit(i, in_dev->cnf.state))
1362 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
1363 }
1364 rcu_read_unlock();
1365 }
1366
1367 /* called with RTNL locked */
1368 static void inet_forward_change(struct net *net)
1369 {
1370 struct net_device *dev;
1371 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
1372
1373 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
1374 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
1375
1376 for_each_netdev(net, dev) {
1377 struct in_device *in_dev;
1378 if (on)
1379 dev_disable_lro(dev);
1380 rcu_read_lock();
1381 in_dev = __in_dev_get_rcu(dev);
1382 if (in_dev)
1383 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
1384 rcu_read_unlock();
1385 }
1386 }
1387
1388 static int devinet_conf_proc(ctl_table *ctl, int write,
1389 void __user *buffer,
1390 size_t *lenp, loff_t *ppos)
1391 {
1392 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1393
1394 if (write) {
1395 struct ipv4_devconf *cnf = ctl->extra1;
1396 struct net *net = ctl->extra2;
1397 int i = (int *)ctl->data - cnf->data;
1398
1399 set_bit(i, cnf->state);
1400
1401 if (cnf == net->ipv4.devconf_dflt)
1402 devinet_copy_dflt_conf(net, i);
1403 }
1404
1405 return ret;
1406 }
1407
1408 static int devinet_sysctl_forward(ctl_table *ctl, int write,
1409 void __user *buffer,
1410 size_t *lenp, loff_t *ppos)
1411 {
1412 int *valp = ctl->data;
1413 int val = *valp;
1414 loff_t pos = *ppos;
1415 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1416
1417 if (write && *valp != val) {
1418 struct net *net = ctl->extra2;
1419
1420 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
1421 if (!rtnl_trylock()) {
1422 /* Restore the original values before restarting */
1423 *valp = val;
1424 *ppos = pos;
1425 return restart_syscall();
1426 }
1427 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
1428 inet_forward_change(net);
1429 } else if (*valp) {
1430 struct ipv4_devconf *cnf = ctl->extra1;
1431 struct in_device *idev =
1432 container_of(cnf, struct in_device, cnf);
1433 dev_disable_lro(idev->dev);
1434 }
1435 rtnl_unlock();
1436 rt_cache_flush(net, 0);
1437 }
1438 }
1439
1440 return ret;
1441 }
1442
1443 static int ipv4_doint_and_flush(ctl_table *ctl, int write,
1444 void __user *buffer,
1445 size_t *lenp, loff_t *ppos)
1446 {
1447 int *valp = ctl->data;
1448 int val = *valp;
1449 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1450 struct net *net = ctl->extra2;
1451
1452 if (write && *valp != val)
1453 rt_cache_flush(net, 0);
1454
1455 return ret;
1456 }
1457
1458 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
1459 { \
1460 .procname = name, \
1461 .data = ipv4_devconf.data + \
1462 IPV4_DEVCONF_ ## attr - 1, \
1463 .maxlen = sizeof(int), \
1464 .mode = mval, \
1465 .proc_handler = proc, \
1466 .extra1 = &ipv4_devconf, \
1467 }
1468
1469 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
1470 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
1471
1472 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
1473 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
1474
1475 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
1476 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
1477
1478 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
1479 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
1480
1481 static struct devinet_sysctl_table {
1482 struct ctl_table_header *sysctl_header;
1483 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
1484 char *dev_name;
1485 } devinet_sysctl = {
1486 .devinet_vars = {
1487 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
1488 devinet_sysctl_forward),
1489 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
1490
1491 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
1492 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
1493 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
1494 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
1495 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
1496 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
1497 "accept_source_route"),
1498 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
1499 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
1500 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
1501 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
1502 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
1503 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
1504 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
1505 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
1506 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
1507 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
1508 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
1509 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
1510 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
1511
1512 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
1513 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
1514 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
1515 "force_igmp_version"),
1516 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
1517 "promote_secondaries"),
1518 },
1519 };
1520
1521 static int __devinet_sysctl_register(struct net *net, char *dev_name,
1522 struct ipv4_devconf *p)
1523 {
1524 int i;
1525 struct devinet_sysctl_table *t;
1526
1527 #define DEVINET_CTL_PATH_DEV 3
1528
1529 struct ctl_path devinet_ctl_path[] = {
1530 { .procname = "net", },
1531 { .procname = "ipv4", },
1532 { .procname = "conf", },
1533 { /* to be set */ },
1534 { },
1535 };
1536
1537 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1538 if (!t)
1539 goto out;
1540
1541 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
1542 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
1543 t->devinet_vars[i].extra1 = p;
1544 t->devinet_vars[i].extra2 = net;
1545 }
1546
1547 /*
1548 * Make a copy of dev_name, because '.procname' is regarded as const
1549 * by sysctl and we wouldn't want anyone to change it under our feet
1550 * (see SIOCSIFNAME).
1551 */
1552 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
1553 if (!t->dev_name)
1554 goto free;
1555
1556 devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name;
1557
1558 t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path,
1559 t->devinet_vars);
1560 if (!t->sysctl_header)
1561 goto free_procname;
1562
1563 p->sysctl = t;
1564 return 0;
1565
1566 free_procname:
1567 kfree(t->dev_name);
1568 free:
1569 kfree(t);
1570 out:
1571 return -ENOBUFS;
1572 }
1573
1574 static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
1575 {
1576 struct devinet_sysctl_table *t = cnf->sysctl;
1577
1578 if (t == NULL)
1579 return;
1580
1581 cnf->sysctl = NULL;
1582 unregister_sysctl_table(t->sysctl_header);
1583 kfree(t->dev_name);
1584 kfree(t);
1585 }
1586
1587 static void devinet_sysctl_register(struct in_device *idev)
1588 {
1589 neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL);
1590 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
1591 &idev->cnf);
1592 }
1593
1594 static void devinet_sysctl_unregister(struct in_device *idev)
1595 {
1596 __devinet_sysctl_unregister(&idev->cnf);
1597 neigh_sysctl_unregister(idev->arp_parms);
1598 }
1599
1600 static struct ctl_table ctl_forward_entry[] = {
1601 {
1602 .procname = "ip_forward",
1603 .data = &ipv4_devconf.data[
1604 IPV4_DEVCONF_FORWARDING - 1],
1605 .maxlen = sizeof(int),
1606 .mode = 0644,
1607 .proc_handler = devinet_sysctl_forward,
1608 .extra1 = &ipv4_devconf,
1609 .extra2 = &init_net,
1610 },
1611 { },
1612 };
1613
1614 static __net_initdata struct ctl_path net_ipv4_path[] = {
1615 { .procname = "net", },
1616 { .procname = "ipv4", },
1617 { },
1618 };
1619 #endif
1620
1621 static __net_init int devinet_init_net(struct net *net)
1622 {
1623 int err;
1624 struct ipv4_devconf *all, *dflt;
1625 #ifdef CONFIG_SYSCTL
1626 struct ctl_table *tbl = ctl_forward_entry;
1627 struct ctl_table_header *forw_hdr;
1628 #endif
1629
1630 err = -ENOMEM;
1631 all = &ipv4_devconf;
1632 dflt = &ipv4_devconf_dflt;
1633
1634 if (!net_eq(net, &init_net)) {
1635 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
1636 if (all == NULL)
1637 goto err_alloc_all;
1638
1639 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
1640 if (dflt == NULL)
1641 goto err_alloc_dflt;
1642
1643 #ifdef CONFIG_SYSCTL
1644 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
1645 if (tbl == NULL)
1646 goto err_alloc_ctl;
1647
1648 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
1649 tbl[0].extra1 = all;
1650 tbl[0].extra2 = net;
1651 #endif
1652 }
1653
1654 #ifdef CONFIG_SYSCTL
1655 err = __devinet_sysctl_register(net, "all", all);
1656 if (err < 0)
1657 goto err_reg_all;
1658
1659 err = __devinet_sysctl_register(net, "default", dflt);
1660 if (err < 0)
1661 goto err_reg_dflt;
1662
1663 err = -ENOMEM;
1664 forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl);
1665 if (forw_hdr == NULL)
1666 goto err_reg_ctl;
1667 net->ipv4.forw_hdr = forw_hdr;
1668 #endif
1669
1670 net->ipv4.devconf_all = all;
1671 net->ipv4.devconf_dflt = dflt;
1672 return 0;
1673
1674 #ifdef CONFIG_SYSCTL
1675 err_reg_ctl:
1676 __devinet_sysctl_unregister(dflt);
1677 err_reg_dflt:
1678 __devinet_sysctl_unregister(all);
1679 err_reg_all:
1680 if (tbl != ctl_forward_entry)
1681 kfree(tbl);
1682 err_alloc_ctl:
1683 #endif
1684 if (dflt != &ipv4_devconf_dflt)
1685 kfree(dflt);
1686 err_alloc_dflt:
1687 if (all != &ipv4_devconf)
1688 kfree(all);
1689 err_alloc_all:
1690 return err;
1691 }
1692
1693 static __net_exit void devinet_exit_net(struct net *net)
1694 {
1695 #ifdef CONFIG_SYSCTL
1696 struct ctl_table *tbl;
1697
1698 tbl = net->ipv4.forw_hdr->ctl_table_arg;
1699 unregister_net_sysctl_table(net->ipv4.forw_hdr);
1700 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
1701 __devinet_sysctl_unregister(net->ipv4.devconf_all);
1702 kfree(tbl);
1703 #endif
1704 kfree(net->ipv4.devconf_dflt);
1705 kfree(net->ipv4.devconf_all);
1706 }
1707
1708 static __net_initdata struct pernet_operations devinet_ops = {
1709 .init = devinet_init_net,
1710 .exit = devinet_exit_net,
1711 };
1712
1713 static struct rtnl_af_ops inet_af_ops = {
1714 .family = AF_INET,
1715 .fill_link_af = inet_fill_link_af,
1716 .get_link_af_size = inet_get_link_af_size,
1717 .validate_link_af = inet_validate_link_af,
1718 .set_link_af = inet_set_link_af,
1719 };
1720
1721 void __init devinet_init(void)
1722 {
1723 register_pernet_subsys(&devinet_ops);
1724
1725 register_gifconf(PF_INET, inet_gifconf);
1726 register_netdevice_notifier(&ip_netdev_notifier);
1727
1728 rtnl_af_register(&inet_af_ops);
1729
1730 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL);
1731 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL);
1732 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr);
1733 }
1734
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree