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sysctl net: Remove unused binary sysctl code
[deliverable/linux.git] / net / ipv4 / devinet.c
1 /*
2 * NET3 IP device support routines.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Derived from the IP parts of dev.c 1.0.19
10 * Authors: Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
13 *
14 * Additional Authors:
15 * Alan Cox, <gw4pts@gw4pts.ampr.org>
16 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
17 *
18 * Changes:
19 * Alexey Kuznetsov: pa_* fields are replaced with ifaddr
20 * lists.
21 * Cyrus Durgin: updated for kmod
22 * Matthias Andree: in devinet_ioctl, compare label and
23 * address (4.4BSD alias style support),
24 * fall back to comparing just the label
25 * if no match found.
26 */
27
28
29 #include <asm/uaccess.h>
30 #include <asm/system.h>
31 #include <linux/bitops.h>
32 #include <linux/capability.h>
33 #include <linux/module.h>
34 #include <linux/types.h>
35 #include <linux/kernel.h>
36 #include <linux/string.h>
37 #include <linux/mm.h>
38 #include <linux/socket.h>
39 #include <linux/sockios.h>
40 #include <linux/in.h>
41 #include <linux/errno.h>
42 #include <linux/interrupt.h>
43 #include <linux/if_addr.h>
44 #include <linux/if_ether.h>
45 #include <linux/inet.h>
46 #include <linux/netdevice.h>
47 #include <linux/etherdevice.h>
48 #include <linux/skbuff.h>
49 #include <linux/init.h>
50 #include <linux/notifier.h>
51 #include <linux/inetdevice.h>
52 #include <linux/igmp.h>
53 #ifdef CONFIG_SYSCTL
54 #include <linux/sysctl.h>
55 #endif
56 #include <linux/kmod.h>
57
58 #include <net/arp.h>
59 #include <net/ip.h>
60 #include <net/route.h>
61 #include <net/ip_fib.h>
62 #include <net/rtnetlink.h>
63 #include <net/net_namespace.h>
64
65 static struct ipv4_devconf ipv4_devconf = {
66 .data = {
67 [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1,
68 [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1,
69 [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1,
70 [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1,
71 },
72 };
73
74 static struct ipv4_devconf ipv4_devconf_dflt = {
75 .data = {
76 [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1,
77 [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1,
78 [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1,
79 [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1,
80 [NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
81 },
82 };
83
84 #define IPV4_DEVCONF_DFLT(net, attr) \
85 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
86
87 static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
88 [IFA_LOCAL] = { .type = NLA_U32 },
89 [IFA_ADDRESS] = { .type = NLA_U32 },
90 [IFA_BROADCAST] = { .type = NLA_U32 },
91 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
92 };
93
94 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
95
96 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
97 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
98 int destroy);
99 #ifdef CONFIG_SYSCTL
100 static void devinet_sysctl_register(struct in_device *idev);
101 static void devinet_sysctl_unregister(struct in_device *idev);
102 #else
103 static inline void devinet_sysctl_register(struct in_device *idev)
104 {
105 }
106 static inline void devinet_sysctl_unregister(struct in_device *idev)
107 {
108 }
109 #endif
110
111 /* Locks all the inet devices. */
112
113 static struct in_ifaddr *inet_alloc_ifa(void)
114 {
115 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
116 }
117
118 static void inet_rcu_free_ifa(struct rcu_head *head)
119 {
120 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
121 if (ifa->ifa_dev)
122 in_dev_put(ifa->ifa_dev);
123 kfree(ifa);
124 }
125
126 static inline void inet_free_ifa(struct in_ifaddr *ifa)
127 {
128 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
129 }
130
131 void in_dev_finish_destroy(struct in_device *idev)
132 {
133 struct net_device *dev = idev->dev;
134
135 WARN_ON(idev->ifa_list);
136 WARN_ON(idev->mc_list);
137 #ifdef NET_REFCNT_DEBUG
138 printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n",
139 idev, dev ? dev->name : "NIL");
140 #endif
141 dev_put(dev);
142 if (!idev->dead)
143 printk("Freeing alive in_device %p\n", idev);
144 else {
145 kfree(idev);
146 }
147 }
148
149 static struct in_device *inetdev_init(struct net_device *dev)
150 {
151 struct in_device *in_dev;
152
153 ASSERT_RTNL();
154
155 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
156 if (!in_dev)
157 goto out;
158 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
159 sizeof(in_dev->cnf));
160 in_dev->cnf.sysctl = NULL;
161 in_dev->dev = dev;
162 if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL)
163 goto out_kfree;
164 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
165 dev_disable_lro(dev);
166 /* Reference in_dev->dev */
167 dev_hold(dev);
168 /* Account for reference dev->ip_ptr (below) */
169 in_dev_hold(in_dev);
170
171 devinet_sysctl_register(in_dev);
172 ip_mc_init_dev(in_dev);
173 if (dev->flags & IFF_UP)
174 ip_mc_up(in_dev);
175
176 /* we can receive as soon as ip_ptr is set -- do this last */
177 rcu_assign_pointer(dev->ip_ptr, in_dev);
178 out:
179 return in_dev;
180 out_kfree:
181 kfree(in_dev);
182 in_dev = NULL;
183 goto out;
184 }
185
186 static void in_dev_rcu_put(struct rcu_head *head)
187 {
188 struct in_device *idev = container_of(head, struct in_device, rcu_head);
189 in_dev_put(idev);
190 }
191
192 static void inetdev_destroy(struct in_device *in_dev)
193 {
194 struct in_ifaddr *ifa;
195 struct net_device *dev;
196
197 ASSERT_RTNL();
198
199 dev = in_dev->dev;
200
201 in_dev->dead = 1;
202
203 ip_mc_destroy_dev(in_dev);
204
205 while ((ifa = in_dev->ifa_list) != NULL) {
206 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
207 inet_free_ifa(ifa);
208 }
209
210 dev->ip_ptr = NULL;
211
212 devinet_sysctl_unregister(in_dev);
213 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
214 arp_ifdown(dev);
215
216 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
217 }
218
219 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
220 {
221 rcu_read_lock();
222 for_primary_ifa(in_dev) {
223 if (inet_ifa_match(a, ifa)) {
224 if (!b || inet_ifa_match(b, ifa)) {
225 rcu_read_unlock();
226 return 1;
227 }
228 }
229 } endfor_ifa(in_dev);
230 rcu_read_unlock();
231 return 0;
232 }
233
234 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
235 int destroy, struct nlmsghdr *nlh, u32 pid)
236 {
237 struct in_ifaddr *promote = NULL;
238 struct in_ifaddr *ifa, *ifa1 = *ifap;
239 struct in_ifaddr *last_prim = in_dev->ifa_list;
240 struct in_ifaddr *prev_prom = NULL;
241 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
242
243 ASSERT_RTNL();
244
245 /* 1. Deleting primary ifaddr forces deletion all secondaries
246 * unless alias promotion is set
247 **/
248
249 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
250 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
251
252 while ((ifa = *ifap1) != NULL) {
253 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
254 ifa1->ifa_scope <= ifa->ifa_scope)
255 last_prim = ifa;
256
257 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
258 ifa1->ifa_mask != ifa->ifa_mask ||
259 !inet_ifa_match(ifa1->ifa_address, ifa)) {
260 ifap1 = &ifa->ifa_next;
261 prev_prom = ifa;
262 continue;
263 }
264
265 if (!do_promote) {
266 *ifap1 = ifa->ifa_next;
267
268 rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid);
269 blocking_notifier_call_chain(&inetaddr_chain,
270 NETDEV_DOWN, ifa);
271 inet_free_ifa(ifa);
272 } else {
273 promote = ifa;
274 break;
275 }
276 }
277 }
278
279 /* 2. Unlink it */
280
281 *ifap = ifa1->ifa_next;
282
283 /* 3. Announce address deletion */
284
285 /* Send message first, then call notifier.
286 At first sight, FIB update triggered by notifier
287 will refer to already deleted ifaddr, that could confuse
288 netlink listeners. It is not true: look, gated sees
289 that route deleted and if it still thinks that ifaddr
290 is valid, it will try to restore deleted routes... Grr.
291 So that, this order is correct.
292 */
293 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid);
294 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
295
296 if (promote) {
297
298 if (prev_prom) {
299 prev_prom->ifa_next = promote->ifa_next;
300 promote->ifa_next = last_prim->ifa_next;
301 last_prim->ifa_next = promote;
302 }
303
304 promote->ifa_flags &= ~IFA_F_SECONDARY;
305 rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid);
306 blocking_notifier_call_chain(&inetaddr_chain,
307 NETDEV_UP, promote);
308 for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) {
309 if (ifa1->ifa_mask != ifa->ifa_mask ||
310 !inet_ifa_match(ifa1->ifa_address, ifa))
311 continue;
312 fib_add_ifaddr(ifa);
313 }
314
315 }
316 if (destroy)
317 inet_free_ifa(ifa1);
318 }
319
320 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
321 int destroy)
322 {
323 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
324 }
325
326 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
327 u32 pid)
328 {
329 struct in_device *in_dev = ifa->ifa_dev;
330 struct in_ifaddr *ifa1, **ifap, **last_primary;
331
332 ASSERT_RTNL();
333
334 if (!ifa->ifa_local) {
335 inet_free_ifa(ifa);
336 return 0;
337 }
338
339 ifa->ifa_flags &= ~IFA_F_SECONDARY;
340 last_primary = &in_dev->ifa_list;
341
342 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
343 ifap = &ifa1->ifa_next) {
344 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
345 ifa->ifa_scope <= ifa1->ifa_scope)
346 last_primary = &ifa1->ifa_next;
347 if (ifa1->ifa_mask == ifa->ifa_mask &&
348 inet_ifa_match(ifa1->ifa_address, ifa)) {
349 if (ifa1->ifa_local == ifa->ifa_local) {
350 inet_free_ifa(ifa);
351 return -EEXIST;
352 }
353 if (ifa1->ifa_scope != ifa->ifa_scope) {
354 inet_free_ifa(ifa);
355 return -EINVAL;
356 }
357 ifa->ifa_flags |= IFA_F_SECONDARY;
358 }
359 }
360
361 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
362 net_srandom(ifa->ifa_local);
363 ifap = last_primary;
364 }
365
366 ifa->ifa_next = *ifap;
367 *ifap = ifa;
368
369 /* Send message first, then call notifier.
370 Notifier will trigger FIB update, so that
371 listeners of netlink will know about new ifaddr */
372 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid);
373 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
374
375 return 0;
376 }
377
378 static int inet_insert_ifa(struct in_ifaddr *ifa)
379 {
380 return __inet_insert_ifa(ifa, NULL, 0);
381 }
382
383 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
384 {
385 struct in_device *in_dev = __in_dev_get_rtnl(dev);
386
387 ASSERT_RTNL();
388
389 if (!in_dev) {
390 inet_free_ifa(ifa);
391 return -ENOBUFS;
392 }
393 ipv4_devconf_setall(in_dev);
394 if (ifa->ifa_dev != in_dev) {
395 WARN_ON(ifa->ifa_dev);
396 in_dev_hold(in_dev);
397 ifa->ifa_dev = in_dev;
398 }
399 if (ipv4_is_loopback(ifa->ifa_local))
400 ifa->ifa_scope = RT_SCOPE_HOST;
401 return inet_insert_ifa(ifa);
402 }
403
404 struct in_device *inetdev_by_index(struct net *net, int ifindex)
405 {
406 struct net_device *dev;
407 struct in_device *in_dev = NULL;
408 read_lock(&dev_base_lock);
409 dev = __dev_get_by_index(net, ifindex);
410 if (dev)
411 in_dev = in_dev_get(dev);
412 read_unlock(&dev_base_lock);
413 return in_dev;
414 }
415
416 /* Called only from RTNL semaphored context. No locks. */
417
418 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
419 __be32 mask)
420 {
421 ASSERT_RTNL();
422
423 for_primary_ifa(in_dev) {
424 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
425 return ifa;
426 } endfor_ifa(in_dev);
427 return NULL;
428 }
429
430 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
431 {
432 struct net *net = sock_net(skb->sk);
433 struct nlattr *tb[IFA_MAX+1];
434 struct in_device *in_dev;
435 struct ifaddrmsg *ifm;
436 struct in_ifaddr *ifa, **ifap;
437 int err = -EINVAL;
438
439 ASSERT_RTNL();
440
441 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
442 if (err < 0)
443 goto errout;
444
445 ifm = nlmsg_data(nlh);
446 in_dev = inetdev_by_index(net, ifm->ifa_index);
447 if (in_dev == NULL) {
448 err = -ENODEV;
449 goto errout;
450 }
451
452 __in_dev_put(in_dev);
453
454 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
455 ifap = &ifa->ifa_next) {
456 if (tb[IFA_LOCAL] &&
457 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
458 continue;
459
460 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
461 continue;
462
463 if (tb[IFA_ADDRESS] &&
464 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
465 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
466 continue;
467
468 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid);
469 return 0;
470 }
471
472 err = -EADDRNOTAVAIL;
473 errout:
474 return err;
475 }
476
477 static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh)
478 {
479 struct nlattr *tb[IFA_MAX+1];
480 struct in_ifaddr *ifa;
481 struct ifaddrmsg *ifm;
482 struct net_device *dev;
483 struct in_device *in_dev;
484 int err;
485
486 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
487 if (err < 0)
488 goto errout;
489
490 ifm = nlmsg_data(nlh);
491 err = -EINVAL;
492 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
493 goto errout;
494
495 dev = __dev_get_by_index(net, ifm->ifa_index);
496 err = -ENODEV;
497 if (dev == NULL)
498 goto errout;
499
500 in_dev = __in_dev_get_rtnl(dev);
501 err = -ENOBUFS;
502 if (in_dev == NULL)
503 goto errout;
504
505 ifa = inet_alloc_ifa();
506 if (ifa == NULL)
507 /*
508 * A potential indev allocation can be left alive, it stays
509 * assigned to its device and is destroy with it.
510 */
511 goto errout;
512
513 ipv4_devconf_setall(in_dev);
514 in_dev_hold(in_dev);
515
516 if (tb[IFA_ADDRESS] == NULL)
517 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
518
519 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
520 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
521 ifa->ifa_flags = ifm->ifa_flags;
522 ifa->ifa_scope = ifm->ifa_scope;
523 ifa->ifa_dev = in_dev;
524
525 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
526 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
527
528 if (tb[IFA_BROADCAST])
529 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
530
531 if (tb[IFA_LABEL])
532 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
533 else
534 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
535
536 return ifa;
537
538 errout:
539 return ERR_PTR(err);
540 }
541
542 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
543 {
544 struct net *net = sock_net(skb->sk);
545 struct in_ifaddr *ifa;
546
547 ASSERT_RTNL();
548
549 ifa = rtm_to_ifaddr(net, nlh);
550 if (IS_ERR(ifa))
551 return PTR_ERR(ifa);
552
553 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid);
554 }
555
556 /*
557 * Determine a default network mask, based on the IP address.
558 */
559
560 static __inline__ int inet_abc_len(__be32 addr)
561 {
562 int rc = -1; /* Something else, probably a multicast. */
563
564 if (ipv4_is_zeronet(addr))
565 rc = 0;
566 else {
567 __u32 haddr = ntohl(addr);
568
569 if (IN_CLASSA(haddr))
570 rc = 8;
571 else if (IN_CLASSB(haddr))
572 rc = 16;
573 else if (IN_CLASSC(haddr))
574 rc = 24;
575 }
576
577 return rc;
578 }
579
580
581 int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
582 {
583 struct ifreq ifr;
584 struct sockaddr_in sin_orig;
585 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
586 struct in_device *in_dev;
587 struct in_ifaddr **ifap = NULL;
588 struct in_ifaddr *ifa = NULL;
589 struct net_device *dev;
590 char *colon;
591 int ret = -EFAULT;
592 int tryaddrmatch = 0;
593
594 /*
595 * Fetch the caller's info block into kernel space
596 */
597
598 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
599 goto out;
600 ifr.ifr_name[IFNAMSIZ - 1] = 0;
601
602 /* save original address for comparison */
603 memcpy(&sin_orig, sin, sizeof(*sin));
604
605 colon = strchr(ifr.ifr_name, ':');
606 if (colon)
607 *colon = 0;
608
609 dev_load(net, ifr.ifr_name);
610
611 switch (cmd) {
612 case SIOCGIFADDR: /* Get interface address */
613 case SIOCGIFBRDADDR: /* Get the broadcast address */
614 case SIOCGIFDSTADDR: /* Get the destination address */
615 case SIOCGIFNETMASK: /* Get the netmask for the interface */
616 /* Note that these ioctls will not sleep,
617 so that we do not impose a lock.
618 One day we will be forced to put shlock here (I mean SMP)
619 */
620 tryaddrmatch = (sin_orig.sin_family == AF_INET);
621 memset(sin, 0, sizeof(*sin));
622 sin->sin_family = AF_INET;
623 break;
624
625 case SIOCSIFFLAGS:
626 ret = -EACCES;
627 if (!capable(CAP_NET_ADMIN))
628 goto out;
629 break;
630 case SIOCSIFADDR: /* Set interface address (and family) */
631 case SIOCSIFBRDADDR: /* Set the broadcast address */
632 case SIOCSIFDSTADDR: /* Set the destination address */
633 case SIOCSIFNETMASK: /* Set the netmask for the interface */
634 ret = -EACCES;
635 if (!capable(CAP_NET_ADMIN))
636 goto out;
637 ret = -EINVAL;
638 if (sin->sin_family != AF_INET)
639 goto out;
640 break;
641 default:
642 ret = -EINVAL;
643 goto out;
644 }
645
646 rtnl_lock();
647
648 ret = -ENODEV;
649 if ((dev = __dev_get_by_name(net, ifr.ifr_name)) == NULL)
650 goto done;
651
652 if (colon)
653 *colon = ':';
654
655 if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) {
656 if (tryaddrmatch) {
657 /* Matthias Andree */
658 /* compare label and address (4.4BSD style) */
659 /* note: we only do this for a limited set of ioctls
660 and only if the original address family was AF_INET.
661 This is checked above. */
662 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
663 ifap = &ifa->ifa_next) {
664 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
665 sin_orig.sin_addr.s_addr ==
666 ifa->ifa_address) {
667 break; /* found */
668 }
669 }
670 }
671 /* we didn't get a match, maybe the application is
672 4.3BSD-style and passed in junk so we fall back to
673 comparing just the label */
674 if (!ifa) {
675 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
676 ifap = &ifa->ifa_next)
677 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
678 break;
679 }
680 }
681
682 ret = -EADDRNOTAVAIL;
683 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
684 goto done;
685
686 switch (cmd) {
687 case SIOCGIFADDR: /* Get interface address */
688 sin->sin_addr.s_addr = ifa->ifa_local;
689 goto rarok;
690
691 case SIOCGIFBRDADDR: /* Get the broadcast address */
692 sin->sin_addr.s_addr = ifa->ifa_broadcast;
693 goto rarok;
694
695 case SIOCGIFDSTADDR: /* Get the destination address */
696 sin->sin_addr.s_addr = ifa->ifa_address;
697 goto rarok;
698
699 case SIOCGIFNETMASK: /* Get the netmask for the interface */
700 sin->sin_addr.s_addr = ifa->ifa_mask;
701 goto rarok;
702
703 case SIOCSIFFLAGS:
704 if (colon) {
705 ret = -EADDRNOTAVAIL;
706 if (!ifa)
707 break;
708 ret = 0;
709 if (!(ifr.ifr_flags & IFF_UP))
710 inet_del_ifa(in_dev, ifap, 1);
711 break;
712 }
713 ret = dev_change_flags(dev, ifr.ifr_flags);
714 break;
715
716 case SIOCSIFADDR: /* Set interface address (and family) */
717 ret = -EINVAL;
718 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
719 break;
720
721 if (!ifa) {
722 ret = -ENOBUFS;
723 if ((ifa = inet_alloc_ifa()) == NULL)
724 break;
725 if (colon)
726 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
727 else
728 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
729 } else {
730 ret = 0;
731 if (ifa->ifa_local == sin->sin_addr.s_addr)
732 break;
733 inet_del_ifa(in_dev, ifap, 0);
734 ifa->ifa_broadcast = 0;
735 ifa->ifa_scope = 0;
736 }
737
738 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
739
740 if (!(dev->flags & IFF_POINTOPOINT)) {
741 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
742 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
743 if ((dev->flags & IFF_BROADCAST) &&
744 ifa->ifa_prefixlen < 31)
745 ifa->ifa_broadcast = ifa->ifa_address |
746 ~ifa->ifa_mask;
747 } else {
748 ifa->ifa_prefixlen = 32;
749 ifa->ifa_mask = inet_make_mask(32);
750 }
751 ret = inet_set_ifa(dev, ifa);
752 break;
753
754 case SIOCSIFBRDADDR: /* Set the broadcast address */
755 ret = 0;
756 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
757 inet_del_ifa(in_dev, ifap, 0);
758 ifa->ifa_broadcast = sin->sin_addr.s_addr;
759 inet_insert_ifa(ifa);
760 }
761 break;
762
763 case SIOCSIFDSTADDR: /* Set the destination address */
764 ret = 0;
765 if (ifa->ifa_address == sin->sin_addr.s_addr)
766 break;
767 ret = -EINVAL;
768 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
769 break;
770 ret = 0;
771 inet_del_ifa(in_dev, ifap, 0);
772 ifa->ifa_address = sin->sin_addr.s_addr;
773 inet_insert_ifa(ifa);
774 break;
775
776 case SIOCSIFNETMASK: /* Set the netmask for the interface */
777
778 /*
779 * The mask we set must be legal.
780 */
781 ret = -EINVAL;
782 if (bad_mask(sin->sin_addr.s_addr, 0))
783 break;
784 ret = 0;
785 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
786 __be32 old_mask = ifa->ifa_mask;
787 inet_del_ifa(in_dev, ifap, 0);
788 ifa->ifa_mask = sin->sin_addr.s_addr;
789 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
790
791 /* See if current broadcast address matches
792 * with current netmask, then recalculate
793 * the broadcast address. Otherwise it's a
794 * funny address, so don't touch it since
795 * the user seems to know what (s)he's doing...
796 */
797 if ((dev->flags & IFF_BROADCAST) &&
798 (ifa->ifa_prefixlen < 31) &&
799 (ifa->ifa_broadcast ==
800 (ifa->ifa_local|~old_mask))) {
801 ifa->ifa_broadcast = (ifa->ifa_local |
802 ~sin->sin_addr.s_addr);
803 }
804 inet_insert_ifa(ifa);
805 }
806 break;
807 }
808 done:
809 rtnl_unlock();
810 out:
811 return ret;
812 rarok:
813 rtnl_unlock();
814 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
815 goto out;
816 }
817
818 static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
819 {
820 struct in_device *in_dev = __in_dev_get_rtnl(dev);
821 struct in_ifaddr *ifa;
822 struct ifreq ifr;
823 int done = 0;
824
825 if (!in_dev || (ifa = in_dev->ifa_list) == NULL)
826 goto out;
827
828 for (; ifa; ifa = ifa->ifa_next) {
829 if (!buf) {
830 done += sizeof(ifr);
831 continue;
832 }
833 if (len < (int) sizeof(ifr))
834 break;
835 memset(&ifr, 0, sizeof(struct ifreq));
836 if (ifa->ifa_label)
837 strcpy(ifr.ifr_name, ifa->ifa_label);
838 else
839 strcpy(ifr.ifr_name, dev->name);
840
841 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
842 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
843 ifa->ifa_local;
844
845 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
846 done = -EFAULT;
847 break;
848 }
849 buf += sizeof(struct ifreq);
850 len -= sizeof(struct ifreq);
851 done += sizeof(struct ifreq);
852 }
853 out:
854 return done;
855 }
856
857 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
858 {
859 __be32 addr = 0;
860 struct in_device *in_dev;
861 struct net *net = dev_net(dev);
862
863 rcu_read_lock();
864 in_dev = __in_dev_get_rcu(dev);
865 if (!in_dev)
866 goto no_in_dev;
867
868 for_primary_ifa(in_dev) {
869 if (ifa->ifa_scope > scope)
870 continue;
871 if (!dst || inet_ifa_match(dst, ifa)) {
872 addr = ifa->ifa_local;
873 break;
874 }
875 if (!addr)
876 addr = ifa->ifa_local;
877 } endfor_ifa(in_dev);
878 no_in_dev:
879 rcu_read_unlock();
880
881 if (addr)
882 goto out;
883
884 /* Not loopback addresses on loopback should be preferred
885 in this case. It is importnat that lo is the first interface
886 in dev_base list.
887 */
888 read_lock(&dev_base_lock);
889 rcu_read_lock();
890 for_each_netdev(net, dev) {
891 if ((in_dev = __in_dev_get_rcu(dev)) == NULL)
892 continue;
893
894 for_primary_ifa(in_dev) {
895 if (ifa->ifa_scope != RT_SCOPE_LINK &&
896 ifa->ifa_scope <= scope) {
897 addr = ifa->ifa_local;
898 goto out_unlock_both;
899 }
900 } endfor_ifa(in_dev);
901 }
902 out_unlock_both:
903 read_unlock(&dev_base_lock);
904 rcu_read_unlock();
905 out:
906 return addr;
907 }
908
909 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
910 __be32 local, int scope)
911 {
912 int same = 0;
913 __be32 addr = 0;
914
915 for_ifa(in_dev) {
916 if (!addr &&
917 (local == ifa->ifa_local || !local) &&
918 ifa->ifa_scope <= scope) {
919 addr = ifa->ifa_local;
920 if (same)
921 break;
922 }
923 if (!same) {
924 same = (!local || inet_ifa_match(local, ifa)) &&
925 (!dst || inet_ifa_match(dst, ifa));
926 if (same && addr) {
927 if (local || !dst)
928 break;
929 /* Is the selected addr into dst subnet? */
930 if (inet_ifa_match(addr, ifa))
931 break;
932 /* No, then can we use new local src? */
933 if (ifa->ifa_scope <= scope) {
934 addr = ifa->ifa_local;
935 break;
936 }
937 /* search for large dst subnet for addr */
938 same = 0;
939 }
940 }
941 } endfor_ifa(in_dev);
942
943 return same? addr : 0;
944 }
945
946 /*
947 * Confirm that local IP address exists using wildcards:
948 * - in_dev: only on this interface, 0=any interface
949 * - dst: only in the same subnet as dst, 0=any dst
950 * - local: address, 0=autoselect the local address
951 * - scope: maximum allowed scope value for the local address
952 */
953 __be32 inet_confirm_addr(struct in_device *in_dev,
954 __be32 dst, __be32 local, int scope)
955 {
956 __be32 addr = 0;
957 struct net_device *dev;
958 struct net *net;
959
960 if (scope != RT_SCOPE_LINK)
961 return confirm_addr_indev(in_dev, dst, local, scope);
962
963 net = dev_net(in_dev->dev);
964 read_lock(&dev_base_lock);
965 rcu_read_lock();
966 for_each_netdev(net, dev) {
967 if ((in_dev = __in_dev_get_rcu(dev))) {
968 addr = confirm_addr_indev(in_dev, dst, local, scope);
969 if (addr)
970 break;
971 }
972 }
973 rcu_read_unlock();
974 read_unlock(&dev_base_lock);
975
976 return addr;
977 }
978
979 /*
980 * Device notifier
981 */
982
983 int register_inetaddr_notifier(struct notifier_block *nb)
984 {
985 return blocking_notifier_chain_register(&inetaddr_chain, nb);
986 }
987
988 int unregister_inetaddr_notifier(struct notifier_block *nb)
989 {
990 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
991 }
992
993 /* Rename ifa_labels for a device name change. Make some effort to preserve existing
994 * alias numbering and to create unique labels if possible.
995 */
996 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
997 {
998 struct in_ifaddr *ifa;
999 int named = 0;
1000
1001 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1002 char old[IFNAMSIZ], *dot;
1003
1004 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1005 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1006 if (named++ == 0)
1007 goto skip;
1008 dot = strchr(old, ':');
1009 if (dot == NULL) {
1010 sprintf(old, ":%d", named);
1011 dot = old;
1012 }
1013 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) {
1014 strcat(ifa->ifa_label, dot);
1015 } else {
1016 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1017 }
1018 skip:
1019 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1020 }
1021 }
1022
1023 static inline bool inetdev_valid_mtu(unsigned mtu)
1024 {
1025 return mtu >= 68;
1026 }
1027
1028 /* Called only under RTNL semaphore */
1029
1030 static int inetdev_event(struct notifier_block *this, unsigned long event,
1031 void *ptr)
1032 {
1033 struct net_device *dev = ptr;
1034 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1035
1036 ASSERT_RTNL();
1037
1038 if (!in_dev) {
1039 if (event == NETDEV_REGISTER) {
1040 in_dev = inetdev_init(dev);
1041 if (!in_dev)
1042 return notifier_from_errno(-ENOMEM);
1043 if (dev->flags & IFF_LOOPBACK) {
1044 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1045 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1046 }
1047 } else if (event == NETDEV_CHANGEMTU) {
1048 /* Re-enabling IP */
1049 if (inetdev_valid_mtu(dev->mtu))
1050 in_dev = inetdev_init(dev);
1051 }
1052 goto out;
1053 }
1054
1055 switch (event) {
1056 case NETDEV_REGISTER:
1057 printk(KERN_DEBUG "inetdev_event: bug\n");
1058 dev->ip_ptr = NULL;
1059 break;
1060 case NETDEV_UP:
1061 if (!inetdev_valid_mtu(dev->mtu))
1062 break;
1063 if (dev->flags & IFF_LOOPBACK) {
1064 struct in_ifaddr *ifa;
1065 if ((ifa = inet_alloc_ifa()) != NULL) {
1066 ifa->ifa_local =
1067 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1068 ifa->ifa_prefixlen = 8;
1069 ifa->ifa_mask = inet_make_mask(8);
1070 in_dev_hold(in_dev);
1071 ifa->ifa_dev = in_dev;
1072 ifa->ifa_scope = RT_SCOPE_HOST;
1073 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1074 inet_insert_ifa(ifa);
1075 }
1076 }
1077 ip_mc_up(in_dev);
1078 /* fall through */
1079 case NETDEV_CHANGEADDR:
1080 /* Send gratuitous ARP to notify of link change */
1081 if (IN_DEV_ARP_NOTIFY(in_dev)) {
1082 struct in_ifaddr *ifa = in_dev->ifa_list;
1083
1084 if (ifa)
1085 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1086 ifa->ifa_address, dev,
1087 ifa->ifa_address, NULL,
1088 dev->dev_addr, NULL);
1089 }
1090 break;
1091 case NETDEV_DOWN:
1092 ip_mc_down(in_dev);
1093 break;
1094 case NETDEV_BONDING_OLDTYPE:
1095 ip_mc_unmap(in_dev);
1096 break;
1097 case NETDEV_BONDING_NEWTYPE:
1098 ip_mc_remap(in_dev);
1099 break;
1100 case NETDEV_CHANGEMTU:
1101 if (inetdev_valid_mtu(dev->mtu))
1102 break;
1103 /* disable IP when MTU is not enough */
1104 case NETDEV_UNREGISTER:
1105 inetdev_destroy(in_dev);
1106 break;
1107 case NETDEV_CHANGENAME:
1108 /* Do not notify about label change, this event is
1109 * not interesting to applications using netlink.
1110 */
1111 inetdev_changename(dev, in_dev);
1112
1113 devinet_sysctl_unregister(in_dev);
1114 devinet_sysctl_register(in_dev);
1115 break;
1116 }
1117 out:
1118 return NOTIFY_DONE;
1119 }
1120
1121 static struct notifier_block ip_netdev_notifier = {
1122 .notifier_call = inetdev_event,
1123 };
1124
1125 static inline size_t inet_nlmsg_size(void)
1126 {
1127 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1128 + nla_total_size(4) /* IFA_ADDRESS */
1129 + nla_total_size(4) /* IFA_LOCAL */
1130 + nla_total_size(4) /* IFA_BROADCAST */
1131 + nla_total_size(IFNAMSIZ); /* IFA_LABEL */
1132 }
1133
1134 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1135 u32 pid, u32 seq, int event, unsigned int flags)
1136 {
1137 struct ifaddrmsg *ifm;
1138 struct nlmsghdr *nlh;
1139
1140 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
1141 if (nlh == NULL)
1142 return -EMSGSIZE;
1143
1144 ifm = nlmsg_data(nlh);
1145 ifm->ifa_family = AF_INET;
1146 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1147 ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
1148 ifm->ifa_scope = ifa->ifa_scope;
1149 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1150
1151 if (ifa->ifa_address)
1152 NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address);
1153
1154 if (ifa->ifa_local)
1155 NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local);
1156
1157 if (ifa->ifa_broadcast)
1158 NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast);
1159
1160 if (ifa->ifa_label[0])
1161 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
1162
1163 return nlmsg_end(skb, nlh);
1164
1165 nla_put_failure:
1166 nlmsg_cancel(skb, nlh);
1167 return -EMSGSIZE;
1168 }
1169
1170 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1171 {
1172 struct net *net = sock_net(skb->sk);
1173 int idx, ip_idx;
1174 struct net_device *dev;
1175 struct in_device *in_dev;
1176 struct in_ifaddr *ifa;
1177 int s_ip_idx, s_idx = cb->args[0];
1178
1179 s_ip_idx = ip_idx = cb->args[1];
1180 idx = 0;
1181 for_each_netdev(net, dev) {
1182 if (idx < s_idx)
1183 goto cont;
1184 if (idx > s_idx)
1185 s_ip_idx = 0;
1186 if ((in_dev = __in_dev_get_rtnl(dev)) == NULL)
1187 goto cont;
1188
1189 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1190 ifa = ifa->ifa_next, ip_idx++) {
1191 if (ip_idx < s_ip_idx)
1192 continue;
1193 if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
1194 cb->nlh->nlmsg_seq,
1195 RTM_NEWADDR, NLM_F_MULTI) <= 0)
1196 goto done;
1197 }
1198 cont:
1199 idx++;
1200 }
1201
1202 done:
1203 cb->args[0] = idx;
1204 cb->args[1] = ip_idx;
1205
1206 return skb->len;
1207 }
1208
1209 static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1210 u32 pid)
1211 {
1212 struct sk_buff *skb;
1213 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1214 int err = -ENOBUFS;
1215 struct net *net;
1216
1217 net = dev_net(ifa->ifa_dev->dev);
1218 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1219 if (skb == NULL)
1220 goto errout;
1221
1222 err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0);
1223 if (err < 0) {
1224 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1225 WARN_ON(err == -EMSGSIZE);
1226 kfree_skb(skb);
1227 goto errout;
1228 }
1229 rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1230 return;
1231 errout:
1232 if (err < 0)
1233 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1234 }
1235
1236 #ifdef CONFIG_SYSCTL
1237
1238 static void devinet_copy_dflt_conf(struct net *net, int i)
1239 {
1240 struct net_device *dev;
1241
1242 read_lock(&dev_base_lock);
1243 for_each_netdev(net, dev) {
1244 struct in_device *in_dev;
1245 rcu_read_lock();
1246 in_dev = __in_dev_get_rcu(dev);
1247 if (in_dev && !test_bit(i, in_dev->cnf.state))
1248 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
1249 rcu_read_unlock();
1250 }
1251 read_unlock(&dev_base_lock);
1252 }
1253
1254 static void inet_forward_change(struct net *net)
1255 {
1256 struct net_device *dev;
1257 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
1258
1259 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
1260 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
1261
1262 read_lock(&dev_base_lock);
1263 for_each_netdev(net, dev) {
1264 struct in_device *in_dev;
1265 if (on)
1266 dev_disable_lro(dev);
1267 rcu_read_lock();
1268 in_dev = __in_dev_get_rcu(dev);
1269 if (in_dev)
1270 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
1271 rcu_read_unlock();
1272 }
1273 read_unlock(&dev_base_lock);
1274 }
1275
1276 static int devinet_conf_proc(ctl_table *ctl, int write,
1277 void __user *buffer,
1278 size_t *lenp, loff_t *ppos)
1279 {
1280 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1281
1282 if (write) {
1283 struct ipv4_devconf *cnf = ctl->extra1;
1284 struct net *net = ctl->extra2;
1285 int i = (int *)ctl->data - cnf->data;
1286
1287 set_bit(i, cnf->state);
1288
1289 if (cnf == net->ipv4.devconf_dflt)
1290 devinet_copy_dflt_conf(net, i);
1291 }
1292
1293 return ret;
1294 }
1295
1296 static int devinet_sysctl_forward(ctl_table *ctl, int write,
1297 void __user *buffer,
1298 size_t *lenp, loff_t *ppos)
1299 {
1300 int *valp = ctl->data;
1301 int val = *valp;
1302 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1303
1304 if (write && *valp != val) {
1305 struct net *net = ctl->extra2;
1306
1307 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
1308 if (!rtnl_trylock())
1309 return restart_syscall();
1310 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
1311 inet_forward_change(net);
1312 } else if (*valp) {
1313 struct ipv4_devconf *cnf = ctl->extra1;
1314 struct in_device *idev =
1315 container_of(cnf, struct in_device, cnf);
1316 dev_disable_lro(idev->dev);
1317 }
1318 rtnl_unlock();
1319 rt_cache_flush(net, 0);
1320 }
1321 }
1322
1323 return ret;
1324 }
1325
1326 int ipv4_doint_and_flush(ctl_table *ctl, int write,
1327 void __user *buffer,
1328 size_t *lenp, loff_t *ppos)
1329 {
1330 int *valp = ctl->data;
1331 int val = *valp;
1332 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1333 struct net *net = ctl->extra2;
1334
1335 if (write && *valp != val)
1336 rt_cache_flush(net, 0);
1337
1338 return ret;
1339 }
1340
1341 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
1342 { \
1343 .procname = name, \
1344 .data = ipv4_devconf.data + \
1345 NET_IPV4_CONF_ ## attr - 1, \
1346 .maxlen = sizeof(int), \
1347 .mode = mval, \
1348 .proc_handler = proc, \
1349 .extra1 = &ipv4_devconf, \
1350 }
1351
1352 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
1353 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
1354
1355 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
1356 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
1357
1358 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
1359 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
1360
1361 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
1362 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
1363
1364 static struct devinet_sysctl_table {
1365 struct ctl_table_header *sysctl_header;
1366 struct ctl_table devinet_vars[__NET_IPV4_CONF_MAX];
1367 char *dev_name;
1368 } devinet_sysctl = {
1369 .devinet_vars = {
1370 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
1371 devinet_sysctl_forward),
1372 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
1373
1374 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
1375 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
1376 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
1377 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
1378 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
1379 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
1380 "accept_source_route"),
1381 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
1382 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
1383 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
1384 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
1385 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
1386 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
1387 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
1388 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
1389 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
1390 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
1391
1392 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
1393 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
1394 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
1395 "force_igmp_version"),
1396 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
1397 "promote_secondaries"),
1398 },
1399 };
1400
1401 static int __devinet_sysctl_register(struct net *net, char *dev_name,
1402 struct ipv4_devconf *p)
1403 {
1404 int i;
1405 struct devinet_sysctl_table *t;
1406
1407 #define DEVINET_CTL_PATH_DEV 3
1408
1409 struct ctl_path devinet_ctl_path[] = {
1410 { .procname = "net", },
1411 { .procname = "ipv4", },
1412 { .procname = "conf", },
1413 { /* to be set */ },
1414 { },
1415 };
1416
1417 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1418 if (!t)
1419 goto out;
1420
1421 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
1422 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
1423 t->devinet_vars[i].extra1 = p;
1424 t->devinet_vars[i].extra2 = net;
1425 }
1426
1427 /*
1428 * Make a copy of dev_name, because '.procname' is regarded as const
1429 * by sysctl and we wouldn't want anyone to change it under our feet
1430 * (see SIOCSIFNAME).
1431 */
1432 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
1433 if (!t->dev_name)
1434 goto free;
1435
1436 devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name;
1437
1438 t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path,
1439 t->devinet_vars);
1440 if (!t->sysctl_header)
1441 goto free_procname;
1442
1443 p->sysctl = t;
1444 return 0;
1445
1446 free_procname:
1447 kfree(t->dev_name);
1448 free:
1449 kfree(t);
1450 out:
1451 return -ENOBUFS;
1452 }
1453
1454 static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
1455 {
1456 struct devinet_sysctl_table *t = cnf->sysctl;
1457
1458 if (t == NULL)
1459 return;
1460
1461 cnf->sysctl = NULL;
1462 unregister_sysctl_table(t->sysctl_header);
1463 kfree(t->dev_name);
1464 kfree(t);
1465 }
1466
1467 static void devinet_sysctl_register(struct in_device *idev)
1468 {
1469 neigh_sysctl_register(idev->dev, idev->arp_parms, NET_IPV4,
1470 NET_IPV4_NEIGH, "ipv4", NULL);
1471 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
1472 &idev->cnf);
1473 }
1474
1475 static void devinet_sysctl_unregister(struct in_device *idev)
1476 {
1477 __devinet_sysctl_unregister(&idev->cnf);
1478 neigh_sysctl_unregister(idev->arp_parms);
1479 }
1480
1481 static struct ctl_table ctl_forward_entry[] = {
1482 {
1483 .procname = "ip_forward",
1484 .data = &ipv4_devconf.data[
1485 NET_IPV4_CONF_FORWARDING - 1],
1486 .maxlen = sizeof(int),
1487 .mode = 0644,
1488 .proc_handler = devinet_sysctl_forward,
1489 .extra1 = &ipv4_devconf,
1490 .extra2 = &init_net,
1491 },
1492 { },
1493 };
1494
1495 static __net_initdata struct ctl_path net_ipv4_path[] = {
1496 { .procname = "net", },
1497 { .procname = "ipv4", },
1498 { },
1499 };
1500 #endif
1501
1502 static __net_init int devinet_init_net(struct net *net)
1503 {
1504 int err;
1505 struct ipv4_devconf *all, *dflt;
1506 #ifdef CONFIG_SYSCTL
1507 struct ctl_table *tbl = ctl_forward_entry;
1508 struct ctl_table_header *forw_hdr;
1509 #endif
1510
1511 err = -ENOMEM;
1512 all = &ipv4_devconf;
1513 dflt = &ipv4_devconf_dflt;
1514
1515 if (net != &init_net) {
1516 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
1517 if (all == NULL)
1518 goto err_alloc_all;
1519
1520 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
1521 if (dflt == NULL)
1522 goto err_alloc_dflt;
1523
1524 #ifdef CONFIG_SYSCTL
1525 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
1526 if (tbl == NULL)
1527 goto err_alloc_ctl;
1528
1529 tbl[0].data = &all->data[NET_IPV4_CONF_FORWARDING - 1];
1530 tbl[0].extra1 = all;
1531 tbl[0].extra2 = net;
1532 #endif
1533 }
1534
1535 #ifdef CONFIG_SYSCTL
1536 err = __devinet_sysctl_register(net, "all", all);
1537 if (err < 0)
1538 goto err_reg_all;
1539
1540 err = __devinet_sysctl_register(net, "default", dflt);
1541 if (err < 0)
1542 goto err_reg_dflt;
1543
1544 err = -ENOMEM;
1545 forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl);
1546 if (forw_hdr == NULL)
1547 goto err_reg_ctl;
1548 net->ipv4.forw_hdr = forw_hdr;
1549 #endif
1550
1551 net->ipv4.devconf_all = all;
1552 net->ipv4.devconf_dflt = dflt;
1553 return 0;
1554
1555 #ifdef CONFIG_SYSCTL
1556 err_reg_ctl:
1557 __devinet_sysctl_unregister(dflt);
1558 err_reg_dflt:
1559 __devinet_sysctl_unregister(all);
1560 err_reg_all:
1561 if (tbl != ctl_forward_entry)
1562 kfree(tbl);
1563 err_alloc_ctl:
1564 #endif
1565 if (dflt != &ipv4_devconf_dflt)
1566 kfree(dflt);
1567 err_alloc_dflt:
1568 if (all != &ipv4_devconf)
1569 kfree(all);
1570 err_alloc_all:
1571 return err;
1572 }
1573
1574 static __net_exit void devinet_exit_net(struct net *net)
1575 {
1576 #ifdef CONFIG_SYSCTL
1577 struct ctl_table *tbl;
1578
1579 tbl = net->ipv4.forw_hdr->ctl_table_arg;
1580 unregister_net_sysctl_table(net->ipv4.forw_hdr);
1581 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
1582 __devinet_sysctl_unregister(net->ipv4.devconf_all);
1583 kfree(tbl);
1584 #endif
1585 kfree(net->ipv4.devconf_dflt);
1586 kfree(net->ipv4.devconf_all);
1587 }
1588
1589 static __net_initdata struct pernet_operations devinet_ops = {
1590 .init = devinet_init_net,
1591 .exit = devinet_exit_net,
1592 };
1593
1594 void __init devinet_init(void)
1595 {
1596 register_pernet_subsys(&devinet_ops);
1597
1598 register_gifconf(PF_INET, inet_gifconf);
1599 register_netdevice_notifier(&ip_netdev_notifier);
1600
1601 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL);
1602 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL);
1603 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr);
1604 }
1605
1606 EXPORT_SYMBOL(in_dev_finish_destroy);
1607 EXPORT_SYMBOL(inet_select_addr);
1608 EXPORT_SYMBOL(inetdev_by_index);
1609 EXPORT_SYMBOL(register_inetaddr_notifier);
1610 EXPORT_SYMBOL(unregister_inetaddr_notifier);
Linux kernel - Deliverables
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