Commit | Line | Data |
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1da177e4 LT |
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 | |
02c30a84 | 12 | * Authors: Ross Biro |
1da177e4 LT |
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 | ||
1da177e4 LT |
30 | |
31 | #include <asm/uaccess.h> | |
32 | #include <asm/system.h> | |
33 | #include <linux/bitops.h> | |
4fc268d2 | 34 | #include <linux/capability.h> |
1da177e4 LT |
35 | #include <linux/module.h> |
36 | #include <linux/types.h> | |
37 | #include <linux/kernel.h> | |
38 | #include <linux/sched.h> | |
39 | #include <linux/string.h> | |
40 | #include <linux/mm.h> | |
41 | #include <linux/socket.h> | |
42 | #include <linux/sockios.h> | |
43 | #include <linux/in.h> | |
44 | #include <linux/errno.h> | |
45 | #include <linux/interrupt.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/rtnetlink.h> | |
52 | #include <linux/init.h> | |
53 | #include <linux/notifier.h> | |
54 | #include <linux/inetdevice.h> | |
55 | #include <linux/igmp.h> | |
56 | #ifdef CONFIG_SYSCTL | |
57 | #include <linux/sysctl.h> | |
58 | #endif | |
59 | #include <linux/kmod.h> | |
60 | ||
14c85021 | 61 | #include <net/arp.h> |
1da177e4 LT |
62 | #include <net/ip.h> |
63 | #include <net/route.h> | |
64 | #include <net/ip_fib.h> | |
65 | ||
66 | struct ipv4_devconf ipv4_devconf = { | |
67 | .accept_redirects = 1, | |
68 | .send_redirects = 1, | |
69 | .secure_redirects = 1, | |
70 | .shared_media = 1, | |
71 | }; | |
72 | ||
73 | static struct ipv4_devconf ipv4_devconf_dflt = { | |
74 | .accept_redirects = 1, | |
75 | .send_redirects = 1, | |
76 | .secure_redirects = 1, | |
77 | .shared_media = 1, | |
78 | .accept_source_route = 1, | |
79 | }; | |
80 | ||
81 | static void rtmsg_ifa(int event, struct in_ifaddr *); | |
82 | ||
e041c683 | 83 | static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); |
1da177e4 LT |
84 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
85 | int destroy); | |
86 | #ifdef CONFIG_SYSCTL | |
87 | static void devinet_sysctl_register(struct in_device *in_dev, | |
88 | struct ipv4_devconf *p); | |
89 | static void devinet_sysctl_unregister(struct ipv4_devconf *p); | |
90 | #endif | |
91 | ||
92 | /* Locks all the inet devices. */ | |
93 | ||
94 | static struct in_ifaddr *inet_alloc_ifa(void) | |
95 | { | |
0da974f4 | 96 | struct in_ifaddr *ifa = kzalloc(sizeof(*ifa), GFP_KERNEL); |
1da177e4 LT |
97 | |
98 | if (ifa) { | |
1da177e4 LT |
99 | INIT_RCU_HEAD(&ifa->rcu_head); |
100 | } | |
101 | ||
102 | return ifa; | |
103 | } | |
104 | ||
105 | static void inet_rcu_free_ifa(struct rcu_head *head) | |
106 | { | |
107 | struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); | |
108 | if (ifa->ifa_dev) | |
109 | in_dev_put(ifa->ifa_dev); | |
110 | kfree(ifa); | |
111 | } | |
112 | ||
113 | static inline void inet_free_ifa(struct in_ifaddr *ifa) | |
114 | { | |
115 | call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); | |
116 | } | |
117 | ||
118 | void in_dev_finish_destroy(struct in_device *idev) | |
119 | { | |
120 | struct net_device *dev = idev->dev; | |
121 | ||
122 | BUG_TRAP(!idev->ifa_list); | |
123 | BUG_TRAP(!idev->mc_list); | |
124 | #ifdef NET_REFCNT_DEBUG | |
125 | printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n", | |
126 | idev, dev ? dev->name : "NIL"); | |
127 | #endif | |
128 | dev_put(dev); | |
129 | if (!idev->dead) | |
130 | printk("Freeing alive in_device %p\n", idev); | |
131 | else { | |
132 | kfree(idev); | |
133 | } | |
134 | } | |
135 | ||
136 | struct in_device *inetdev_init(struct net_device *dev) | |
137 | { | |
138 | struct in_device *in_dev; | |
139 | ||
140 | ASSERT_RTNL(); | |
141 | ||
0da974f4 | 142 | in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); |
1da177e4 LT |
143 | if (!in_dev) |
144 | goto out; | |
1da177e4 LT |
145 | INIT_RCU_HEAD(&in_dev->rcu_head); |
146 | memcpy(&in_dev->cnf, &ipv4_devconf_dflt, sizeof(in_dev->cnf)); | |
147 | in_dev->cnf.sysctl = NULL; | |
148 | in_dev->dev = dev; | |
149 | if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL) | |
150 | goto out_kfree; | |
151 | /* Reference in_dev->dev */ | |
152 | dev_hold(dev); | |
153 | #ifdef CONFIG_SYSCTL | |
154 | neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4, | |
155 | NET_IPV4_NEIGH, "ipv4", NULL, NULL); | |
156 | #endif | |
157 | ||
158 | /* Account for reference dev->ip_ptr */ | |
159 | in_dev_hold(in_dev); | |
160 | rcu_assign_pointer(dev->ip_ptr, in_dev); | |
161 | ||
162 | #ifdef CONFIG_SYSCTL | |
163 | devinet_sysctl_register(in_dev, &in_dev->cnf); | |
164 | #endif | |
165 | ip_mc_init_dev(in_dev); | |
166 | if (dev->flags & IFF_UP) | |
167 | ip_mc_up(in_dev); | |
168 | out: | |
169 | return in_dev; | |
170 | out_kfree: | |
171 | kfree(in_dev); | |
172 | in_dev = NULL; | |
173 | goto out; | |
174 | } | |
175 | ||
176 | static void in_dev_rcu_put(struct rcu_head *head) | |
177 | { | |
178 | struct in_device *idev = container_of(head, struct in_device, rcu_head); | |
179 | in_dev_put(idev); | |
180 | } | |
181 | ||
182 | static void inetdev_destroy(struct in_device *in_dev) | |
183 | { | |
184 | struct in_ifaddr *ifa; | |
185 | struct net_device *dev; | |
186 | ||
187 | ASSERT_RTNL(); | |
188 | ||
189 | dev = in_dev->dev; | |
190 | if (dev == &loopback_dev) | |
191 | return; | |
192 | ||
193 | in_dev->dead = 1; | |
194 | ||
195 | ip_mc_destroy_dev(in_dev); | |
196 | ||
197 | while ((ifa = in_dev->ifa_list) != NULL) { | |
198 | inet_del_ifa(in_dev, &in_dev->ifa_list, 0); | |
199 | inet_free_ifa(ifa); | |
200 | } | |
201 | ||
202 | #ifdef CONFIG_SYSCTL | |
203 | devinet_sysctl_unregister(&in_dev->cnf); | |
204 | #endif | |
205 | ||
206 | dev->ip_ptr = NULL; | |
207 | ||
208 | #ifdef CONFIG_SYSCTL | |
209 | neigh_sysctl_unregister(in_dev->arp_parms); | |
210 | #endif | |
211 | neigh_parms_release(&arp_tbl, in_dev->arp_parms); | |
212 | arp_ifdown(dev); | |
213 | ||
214 | call_rcu(&in_dev->rcu_head, in_dev_rcu_put); | |
215 | } | |
216 | ||
217 | int inet_addr_onlink(struct in_device *in_dev, u32 a, u32 b) | |
218 | { | |
219 | rcu_read_lock(); | |
220 | for_primary_ifa(in_dev) { | |
221 | if (inet_ifa_match(a, ifa)) { | |
222 | if (!b || inet_ifa_match(b, ifa)) { | |
223 | rcu_read_unlock(); | |
224 | return 1; | |
225 | } | |
226 | } | |
227 | } endfor_ifa(in_dev); | |
228 | rcu_read_unlock(); | |
229 | return 0; | |
230 | } | |
231 | ||
232 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, | |
233 | int destroy) | |
234 | { | |
8f937c60 | 235 | struct in_ifaddr *promote = NULL; |
0ff60a45 JHS |
236 | struct in_ifaddr *ifa, *ifa1 = *ifap; |
237 | struct in_ifaddr *last_prim = in_dev->ifa_list; | |
238 | struct in_ifaddr *prev_prom = NULL; | |
239 | int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); | |
1da177e4 LT |
240 | |
241 | ASSERT_RTNL(); | |
242 | ||
8f937c60 HW |
243 | /* 1. Deleting primary ifaddr forces deletion all secondaries |
244 | * unless alias promotion is set | |
245 | **/ | |
1da177e4 LT |
246 | |
247 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { | |
1da177e4 LT |
248 | struct in_ifaddr **ifap1 = &ifa1->ifa_next; |
249 | ||
250 | while ((ifa = *ifap1) != NULL) { | |
0ff60a45 JHS |
251 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) && |
252 | ifa1->ifa_scope <= ifa->ifa_scope) | |
253 | last_prim = ifa; | |
254 | ||
1da177e4 LT |
255 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) || |
256 | ifa1->ifa_mask != ifa->ifa_mask || | |
257 | !inet_ifa_match(ifa1->ifa_address, ifa)) { | |
258 | ifap1 = &ifa->ifa_next; | |
0ff60a45 | 259 | prev_prom = ifa; |
1da177e4 LT |
260 | continue; |
261 | } | |
262 | ||
0ff60a45 | 263 | if (!do_promote) { |
8f937c60 | 264 | *ifap1 = ifa->ifa_next; |
1da177e4 | 265 | |
8f937c60 | 266 | rtmsg_ifa(RTM_DELADDR, ifa); |
e041c683 AS |
267 | blocking_notifier_call_chain(&inetaddr_chain, |
268 | NETDEV_DOWN, ifa); | |
8f937c60 HW |
269 | inet_free_ifa(ifa); |
270 | } else { | |
271 | promote = ifa; | |
272 | break; | |
273 | } | |
1da177e4 LT |
274 | } |
275 | } | |
276 | ||
277 | /* 2. Unlink it */ | |
278 | ||
279 | *ifap = ifa1->ifa_next; | |
280 | ||
281 | /* 3. Announce address deletion */ | |
282 | ||
283 | /* Send message first, then call notifier. | |
284 | At first sight, FIB update triggered by notifier | |
285 | will refer to already deleted ifaddr, that could confuse | |
286 | netlink listeners. It is not true: look, gated sees | |
287 | that route deleted and if it still thinks that ifaddr | |
288 | is valid, it will try to restore deleted routes... Grr. | |
289 | So that, this order is correct. | |
290 | */ | |
291 | rtmsg_ifa(RTM_DELADDR, ifa1); | |
e041c683 | 292 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); |
1da177e4 | 293 | |
0ff60a45 JHS |
294 | if (promote) { |
295 | ||
296 | if (prev_prom) { | |
297 | prev_prom->ifa_next = promote->ifa_next; | |
298 | promote->ifa_next = last_prim->ifa_next; | |
299 | last_prim->ifa_next = promote; | |
300 | } | |
8f937c60 | 301 | |
8f937c60 HW |
302 | promote->ifa_flags &= ~IFA_F_SECONDARY; |
303 | rtmsg_ifa(RTM_NEWADDR, promote); | |
e041c683 AS |
304 | blocking_notifier_call_chain(&inetaddr_chain, |
305 | NETDEV_UP, promote); | |
0ff60a45 JHS |
306 | for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) { |
307 | if (ifa1->ifa_mask != ifa->ifa_mask || | |
308 | !inet_ifa_match(ifa1->ifa_address, ifa)) | |
309 | continue; | |
310 | fib_add_ifaddr(ifa); | |
311 | } | |
312 | ||
313 | } | |
314 | if (destroy) { | |
315 | inet_free_ifa(ifa1); | |
316 | ||
317 | if (!in_dev->ifa_list) | |
318 | inetdev_destroy(in_dev); | |
8f937c60 | 319 | } |
1da177e4 LT |
320 | } |
321 | ||
322 | static int inet_insert_ifa(struct in_ifaddr *ifa) | |
323 | { | |
324 | struct in_device *in_dev = ifa->ifa_dev; | |
325 | struct in_ifaddr *ifa1, **ifap, **last_primary; | |
326 | ||
327 | ASSERT_RTNL(); | |
328 | ||
329 | if (!ifa->ifa_local) { | |
330 | inet_free_ifa(ifa); | |
331 | return 0; | |
332 | } | |
333 | ||
334 | ifa->ifa_flags &= ~IFA_F_SECONDARY; | |
335 | last_primary = &in_dev->ifa_list; | |
336 | ||
337 | for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; | |
338 | ifap = &ifa1->ifa_next) { | |
339 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && | |
340 | ifa->ifa_scope <= ifa1->ifa_scope) | |
341 | last_primary = &ifa1->ifa_next; | |
342 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
343 | inet_ifa_match(ifa1->ifa_address, ifa)) { | |
344 | if (ifa1->ifa_local == ifa->ifa_local) { | |
345 | inet_free_ifa(ifa); | |
346 | return -EEXIST; | |
347 | } | |
348 | if (ifa1->ifa_scope != ifa->ifa_scope) { | |
349 | inet_free_ifa(ifa); | |
350 | return -EINVAL; | |
351 | } | |
352 | ifa->ifa_flags |= IFA_F_SECONDARY; | |
353 | } | |
354 | } | |
355 | ||
356 | if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { | |
357 | net_srandom(ifa->ifa_local); | |
358 | ifap = last_primary; | |
359 | } | |
360 | ||
361 | ifa->ifa_next = *ifap; | |
362 | *ifap = ifa; | |
363 | ||
364 | /* Send message first, then call notifier. | |
365 | Notifier will trigger FIB update, so that | |
366 | listeners of netlink will know about new ifaddr */ | |
367 | rtmsg_ifa(RTM_NEWADDR, ifa); | |
e041c683 | 368 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); |
1da177e4 LT |
369 | |
370 | return 0; | |
371 | } | |
372 | ||
373 | static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) | |
374 | { | |
e5ed6399 | 375 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
376 | |
377 | ASSERT_RTNL(); | |
378 | ||
379 | if (!in_dev) { | |
380 | in_dev = inetdev_init(dev); | |
381 | if (!in_dev) { | |
382 | inet_free_ifa(ifa); | |
383 | return -ENOBUFS; | |
384 | } | |
385 | } | |
386 | if (ifa->ifa_dev != in_dev) { | |
387 | BUG_TRAP(!ifa->ifa_dev); | |
388 | in_dev_hold(in_dev); | |
389 | ifa->ifa_dev = in_dev; | |
390 | } | |
391 | if (LOOPBACK(ifa->ifa_local)) | |
392 | ifa->ifa_scope = RT_SCOPE_HOST; | |
393 | return inet_insert_ifa(ifa); | |
394 | } | |
395 | ||
396 | struct in_device *inetdev_by_index(int ifindex) | |
397 | { | |
398 | struct net_device *dev; | |
399 | struct in_device *in_dev = NULL; | |
400 | read_lock(&dev_base_lock); | |
401 | dev = __dev_get_by_index(ifindex); | |
402 | if (dev) | |
403 | in_dev = in_dev_get(dev); | |
404 | read_unlock(&dev_base_lock); | |
405 | return in_dev; | |
406 | } | |
407 | ||
408 | /* Called only from RTNL semaphored context. No locks. */ | |
409 | ||
410 | struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, u32 prefix, | |
411 | u32 mask) | |
412 | { | |
413 | ASSERT_RTNL(); | |
414 | ||
415 | for_primary_ifa(in_dev) { | |
416 | if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) | |
417 | return ifa; | |
418 | } endfor_ifa(in_dev); | |
419 | return NULL; | |
420 | } | |
421 | ||
422 | static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
423 | { | |
424 | struct rtattr **rta = arg; | |
425 | struct in_device *in_dev; | |
426 | struct ifaddrmsg *ifm = NLMSG_DATA(nlh); | |
427 | struct in_ifaddr *ifa, **ifap; | |
428 | ||
429 | ASSERT_RTNL(); | |
430 | ||
431 | if ((in_dev = inetdev_by_index(ifm->ifa_index)) == NULL) | |
432 | goto out; | |
433 | __in_dev_put(in_dev); | |
434 | ||
435 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
436 | ifap = &ifa->ifa_next) { | |
437 | if ((rta[IFA_LOCAL - 1] && | |
438 | memcmp(RTA_DATA(rta[IFA_LOCAL - 1]), | |
439 | &ifa->ifa_local, 4)) || | |
440 | (rta[IFA_LABEL - 1] && | |
441 | rtattr_strcmp(rta[IFA_LABEL - 1], ifa->ifa_label)) || | |
442 | (rta[IFA_ADDRESS - 1] && | |
443 | (ifm->ifa_prefixlen != ifa->ifa_prefixlen || | |
444 | !inet_ifa_match(*(u32*)RTA_DATA(rta[IFA_ADDRESS - 1]), | |
445 | ifa)))) | |
446 | continue; | |
447 | inet_del_ifa(in_dev, ifap, 1); | |
448 | return 0; | |
449 | } | |
450 | out: | |
451 | return -EADDRNOTAVAIL; | |
452 | } | |
453 | ||
454 | static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
455 | { | |
456 | struct rtattr **rta = arg; | |
457 | struct net_device *dev; | |
458 | struct in_device *in_dev; | |
459 | struct ifaddrmsg *ifm = NLMSG_DATA(nlh); | |
460 | struct in_ifaddr *ifa; | |
461 | int rc = -EINVAL; | |
462 | ||
463 | ASSERT_RTNL(); | |
464 | ||
465 | if (ifm->ifa_prefixlen > 32 || !rta[IFA_LOCAL - 1]) | |
466 | goto out; | |
467 | ||
468 | rc = -ENODEV; | |
469 | if ((dev = __dev_get_by_index(ifm->ifa_index)) == NULL) | |
470 | goto out; | |
471 | ||
472 | rc = -ENOBUFS; | |
e5ed6399 | 473 | if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) { |
1da177e4 LT |
474 | in_dev = inetdev_init(dev); |
475 | if (!in_dev) | |
476 | goto out; | |
477 | } | |
478 | ||
479 | if ((ifa = inet_alloc_ifa()) == NULL) | |
480 | goto out; | |
481 | ||
482 | if (!rta[IFA_ADDRESS - 1]) | |
483 | rta[IFA_ADDRESS - 1] = rta[IFA_LOCAL - 1]; | |
484 | memcpy(&ifa->ifa_local, RTA_DATA(rta[IFA_LOCAL - 1]), 4); | |
485 | memcpy(&ifa->ifa_address, RTA_DATA(rta[IFA_ADDRESS - 1]), 4); | |
486 | ifa->ifa_prefixlen = ifm->ifa_prefixlen; | |
487 | ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); | |
488 | if (rta[IFA_BROADCAST - 1]) | |
489 | memcpy(&ifa->ifa_broadcast, | |
490 | RTA_DATA(rta[IFA_BROADCAST - 1]), 4); | |
491 | if (rta[IFA_ANYCAST - 1]) | |
492 | memcpy(&ifa->ifa_anycast, RTA_DATA(rta[IFA_ANYCAST - 1]), 4); | |
493 | ifa->ifa_flags = ifm->ifa_flags; | |
494 | ifa->ifa_scope = ifm->ifa_scope; | |
495 | in_dev_hold(in_dev); | |
496 | ifa->ifa_dev = in_dev; | |
497 | if (rta[IFA_LABEL - 1]) | |
498 | rtattr_strlcpy(ifa->ifa_label, rta[IFA_LABEL - 1], IFNAMSIZ); | |
499 | else | |
500 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
501 | ||
502 | rc = inet_insert_ifa(ifa); | |
503 | out: | |
504 | return rc; | |
505 | } | |
506 | ||
507 | /* | |
508 | * Determine a default network mask, based on the IP address. | |
509 | */ | |
510 | ||
511 | static __inline__ int inet_abc_len(u32 addr) | |
512 | { | |
513 | int rc = -1; /* Something else, probably a multicast. */ | |
514 | ||
515 | if (ZERONET(addr)) | |
516 | rc = 0; | |
517 | else { | |
518 | addr = ntohl(addr); | |
519 | ||
520 | if (IN_CLASSA(addr)) | |
521 | rc = 8; | |
522 | else if (IN_CLASSB(addr)) | |
523 | rc = 16; | |
524 | else if (IN_CLASSC(addr)) | |
525 | rc = 24; | |
526 | } | |
527 | ||
528 | return rc; | |
529 | } | |
530 | ||
531 | ||
532 | int devinet_ioctl(unsigned int cmd, void __user *arg) | |
533 | { | |
534 | struct ifreq ifr; | |
535 | struct sockaddr_in sin_orig; | |
536 | struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; | |
537 | struct in_device *in_dev; | |
538 | struct in_ifaddr **ifap = NULL; | |
539 | struct in_ifaddr *ifa = NULL; | |
540 | struct net_device *dev; | |
541 | char *colon; | |
542 | int ret = -EFAULT; | |
543 | int tryaddrmatch = 0; | |
544 | ||
545 | /* | |
546 | * Fetch the caller's info block into kernel space | |
547 | */ | |
548 | ||
549 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
550 | goto out; | |
551 | ifr.ifr_name[IFNAMSIZ - 1] = 0; | |
552 | ||
553 | /* save original address for comparison */ | |
554 | memcpy(&sin_orig, sin, sizeof(*sin)); | |
555 | ||
556 | colon = strchr(ifr.ifr_name, ':'); | |
557 | if (colon) | |
558 | *colon = 0; | |
559 | ||
560 | #ifdef CONFIG_KMOD | |
561 | dev_load(ifr.ifr_name); | |
562 | #endif | |
563 | ||
564 | switch(cmd) { | |
565 | case SIOCGIFADDR: /* Get interface address */ | |
566 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
567 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
568 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
569 | /* Note that these ioctls will not sleep, | |
570 | so that we do not impose a lock. | |
571 | One day we will be forced to put shlock here (I mean SMP) | |
572 | */ | |
573 | tryaddrmatch = (sin_orig.sin_family == AF_INET); | |
574 | memset(sin, 0, sizeof(*sin)); | |
575 | sin->sin_family = AF_INET; | |
576 | break; | |
577 | ||
578 | case SIOCSIFFLAGS: | |
579 | ret = -EACCES; | |
580 | if (!capable(CAP_NET_ADMIN)) | |
581 | goto out; | |
582 | break; | |
583 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
584 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
585 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
586 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
587 | ret = -EACCES; | |
588 | if (!capable(CAP_NET_ADMIN)) | |
589 | goto out; | |
590 | ret = -EINVAL; | |
591 | if (sin->sin_family != AF_INET) | |
592 | goto out; | |
593 | break; | |
594 | default: | |
595 | ret = -EINVAL; | |
596 | goto out; | |
597 | } | |
598 | ||
599 | rtnl_lock(); | |
600 | ||
601 | ret = -ENODEV; | |
602 | if ((dev = __dev_get_by_name(ifr.ifr_name)) == NULL) | |
603 | goto done; | |
604 | ||
605 | if (colon) | |
606 | *colon = ':'; | |
607 | ||
e5ed6399 | 608 | if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { |
1da177e4 LT |
609 | if (tryaddrmatch) { |
610 | /* Matthias Andree */ | |
611 | /* compare label and address (4.4BSD style) */ | |
612 | /* note: we only do this for a limited set of ioctls | |
613 | and only if the original address family was AF_INET. | |
614 | This is checked above. */ | |
615 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
616 | ifap = &ifa->ifa_next) { | |
617 | if (!strcmp(ifr.ifr_name, ifa->ifa_label) && | |
618 | sin_orig.sin_addr.s_addr == | |
619 | ifa->ifa_address) { | |
620 | break; /* found */ | |
621 | } | |
622 | } | |
623 | } | |
624 | /* we didn't get a match, maybe the application is | |
625 | 4.3BSD-style and passed in junk so we fall back to | |
626 | comparing just the label */ | |
627 | if (!ifa) { | |
628 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
629 | ifap = &ifa->ifa_next) | |
630 | if (!strcmp(ifr.ifr_name, ifa->ifa_label)) | |
631 | break; | |
632 | } | |
633 | } | |
634 | ||
635 | ret = -EADDRNOTAVAIL; | |
636 | if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) | |
637 | goto done; | |
638 | ||
639 | switch(cmd) { | |
640 | case SIOCGIFADDR: /* Get interface address */ | |
641 | sin->sin_addr.s_addr = ifa->ifa_local; | |
642 | goto rarok; | |
643 | ||
644 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
645 | sin->sin_addr.s_addr = ifa->ifa_broadcast; | |
646 | goto rarok; | |
647 | ||
648 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
649 | sin->sin_addr.s_addr = ifa->ifa_address; | |
650 | goto rarok; | |
651 | ||
652 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
653 | sin->sin_addr.s_addr = ifa->ifa_mask; | |
654 | goto rarok; | |
655 | ||
656 | case SIOCSIFFLAGS: | |
657 | if (colon) { | |
658 | ret = -EADDRNOTAVAIL; | |
659 | if (!ifa) | |
660 | break; | |
661 | ret = 0; | |
662 | if (!(ifr.ifr_flags & IFF_UP)) | |
663 | inet_del_ifa(in_dev, ifap, 1); | |
664 | break; | |
665 | } | |
666 | ret = dev_change_flags(dev, ifr.ifr_flags); | |
667 | break; | |
668 | ||
669 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
670 | ret = -EINVAL; | |
671 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
672 | break; | |
673 | ||
674 | if (!ifa) { | |
675 | ret = -ENOBUFS; | |
676 | if ((ifa = inet_alloc_ifa()) == NULL) | |
677 | break; | |
678 | if (colon) | |
679 | memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); | |
680 | else | |
681 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
682 | } else { | |
683 | ret = 0; | |
684 | if (ifa->ifa_local == sin->sin_addr.s_addr) | |
685 | break; | |
686 | inet_del_ifa(in_dev, ifap, 0); | |
687 | ifa->ifa_broadcast = 0; | |
688 | ifa->ifa_anycast = 0; | |
689 | } | |
690 | ||
691 | ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; | |
692 | ||
693 | if (!(dev->flags & IFF_POINTOPOINT)) { | |
694 | ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); | |
695 | ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); | |
696 | if ((dev->flags & IFF_BROADCAST) && | |
697 | ifa->ifa_prefixlen < 31) | |
698 | ifa->ifa_broadcast = ifa->ifa_address | | |
699 | ~ifa->ifa_mask; | |
700 | } else { | |
701 | ifa->ifa_prefixlen = 32; | |
702 | ifa->ifa_mask = inet_make_mask(32); | |
703 | } | |
704 | ret = inet_set_ifa(dev, ifa); | |
705 | break; | |
706 | ||
707 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
708 | ret = 0; | |
709 | if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { | |
710 | inet_del_ifa(in_dev, ifap, 0); | |
711 | ifa->ifa_broadcast = sin->sin_addr.s_addr; | |
712 | inet_insert_ifa(ifa); | |
713 | } | |
714 | break; | |
715 | ||
716 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
717 | ret = 0; | |
718 | if (ifa->ifa_address == sin->sin_addr.s_addr) | |
719 | break; | |
720 | ret = -EINVAL; | |
721 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
722 | break; | |
723 | ret = 0; | |
724 | inet_del_ifa(in_dev, ifap, 0); | |
725 | ifa->ifa_address = sin->sin_addr.s_addr; | |
726 | inet_insert_ifa(ifa); | |
727 | break; | |
728 | ||
729 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
730 | ||
731 | /* | |
732 | * The mask we set must be legal. | |
733 | */ | |
734 | ret = -EINVAL; | |
735 | if (bad_mask(sin->sin_addr.s_addr, 0)) | |
736 | break; | |
737 | ret = 0; | |
738 | if (ifa->ifa_mask != sin->sin_addr.s_addr) { | |
dcab5e1e | 739 | u32 old_mask = ifa->ifa_mask; |
1da177e4 LT |
740 | inet_del_ifa(in_dev, ifap, 0); |
741 | ifa->ifa_mask = sin->sin_addr.s_addr; | |
742 | ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); | |
743 | ||
744 | /* See if current broadcast address matches | |
745 | * with current netmask, then recalculate | |
746 | * the broadcast address. Otherwise it's a | |
747 | * funny address, so don't touch it since | |
748 | * the user seems to know what (s)he's doing... | |
749 | */ | |
750 | if ((dev->flags & IFF_BROADCAST) && | |
751 | (ifa->ifa_prefixlen < 31) && | |
752 | (ifa->ifa_broadcast == | |
dcab5e1e | 753 | (ifa->ifa_local|~old_mask))) { |
1da177e4 LT |
754 | ifa->ifa_broadcast = (ifa->ifa_local | |
755 | ~sin->sin_addr.s_addr); | |
756 | } | |
757 | inet_insert_ifa(ifa); | |
758 | } | |
759 | break; | |
760 | } | |
761 | done: | |
762 | rtnl_unlock(); | |
763 | out: | |
764 | return ret; | |
765 | rarok: | |
766 | rtnl_unlock(); | |
767 | ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; | |
768 | goto out; | |
769 | } | |
770 | ||
771 | static int inet_gifconf(struct net_device *dev, char __user *buf, int len) | |
772 | { | |
e5ed6399 | 773 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
774 | struct in_ifaddr *ifa; |
775 | struct ifreq ifr; | |
776 | int done = 0; | |
777 | ||
778 | if (!in_dev || (ifa = in_dev->ifa_list) == NULL) | |
779 | goto out; | |
780 | ||
781 | for (; ifa; ifa = ifa->ifa_next) { | |
782 | if (!buf) { | |
783 | done += sizeof(ifr); | |
784 | continue; | |
785 | } | |
786 | if (len < (int) sizeof(ifr)) | |
787 | break; | |
788 | memset(&ifr, 0, sizeof(struct ifreq)); | |
789 | if (ifa->ifa_label) | |
790 | strcpy(ifr.ifr_name, ifa->ifa_label); | |
791 | else | |
792 | strcpy(ifr.ifr_name, dev->name); | |
793 | ||
794 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; | |
795 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = | |
796 | ifa->ifa_local; | |
797 | ||
798 | if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { | |
799 | done = -EFAULT; | |
800 | break; | |
801 | } | |
802 | buf += sizeof(struct ifreq); | |
803 | len -= sizeof(struct ifreq); | |
804 | done += sizeof(struct ifreq); | |
805 | } | |
806 | out: | |
807 | return done; | |
808 | } | |
809 | ||
810 | u32 inet_select_addr(const struct net_device *dev, u32 dst, int scope) | |
811 | { | |
812 | u32 addr = 0; | |
813 | struct in_device *in_dev; | |
814 | ||
815 | rcu_read_lock(); | |
e5ed6399 | 816 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
817 | if (!in_dev) |
818 | goto no_in_dev; | |
819 | ||
820 | for_primary_ifa(in_dev) { | |
821 | if (ifa->ifa_scope > scope) | |
822 | continue; | |
823 | if (!dst || inet_ifa_match(dst, ifa)) { | |
824 | addr = ifa->ifa_local; | |
825 | break; | |
826 | } | |
827 | if (!addr) | |
828 | addr = ifa->ifa_local; | |
829 | } endfor_ifa(in_dev); | |
830 | no_in_dev: | |
831 | rcu_read_unlock(); | |
832 | ||
833 | if (addr) | |
834 | goto out; | |
835 | ||
836 | /* Not loopback addresses on loopback should be preferred | |
837 | in this case. It is importnat that lo is the first interface | |
838 | in dev_base list. | |
839 | */ | |
840 | read_lock(&dev_base_lock); | |
841 | rcu_read_lock(); | |
842 | for (dev = dev_base; dev; dev = dev->next) { | |
e5ed6399 | 843 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) |
1da177e4 LT |
844 | continue; |
845 | ||
846 | for_primary_ifa(in_dev) { | |
847 | if (ifa->ifa_scope != RT_SCOPE_LINK && | |
848 | ifa->ifa_scope <= scope) { | |
849 | addr = ifa->ifa_local; | |
850 | goto out_unlock_both; | |
851 | } | |
852 | } endfor_ifa(in_dev); | |
853 | } | |
854 | out_unlock_both: | |
855 | read_unlock(&dev_base_lock); | |
856 | rcu_read_unlock(); | |
857 | out: | |
858 | return addr; | |
859 | } | |
860 | ||
861 | static u32 confirm_addr_indev(struct in_device *in_dev, u32 dst, | |
862 | u32 local, int scope) | |
863 | { | |
864 | int same = 0; | |
865 | u32 addr = 0; | |
866 | ||
867 | for_ifa(in_dev) { | |
868 | if (!addr && | |
869 | (local == ifa->ifa_local || !local) && | |
870 | ifa->ifa_scope <= scope) { | |
871 | addr = ifa->ifa_local; | |
872 | if (same) | |
873 | break; | |
874 | } | |
875 | if (!same) { | |
876 | same = (!local || inet_ifa_match(local, ifa)) && | |
877 | (!dst || inet_ifa_match(dst, ifa)); | |
878 | if (same && addr) { | |
879 | if (local || !dst) | |
880 | break; | |
881 | /* Is the selected addr into dst subnet? */ | |
882 | if (inet_ifa_match(addr, ifa)) | |
883 | break; | |
884 | /* No, then can we use new local src? */ | |
885 | if (ifa->ifa_scope <= scope) { | |
886 | addr = ifa->ifa_local; | |
887 | break; | |
888 | } | |
889 | /* search for large dst subnet for addr */ | |
890 | same = 0; | |
891 | } | |
892 | } | |
893 | } endfor_ifa(in_dev); | |
894 | ||
895 | return same? addr : 0; | |
896 | } | |
897 | ||
898 | /* | |
899 | * Confirm that local IP address exists using wildcards: | |
900 | * - dev: only on this interface, 0=any interface | |
901 | * - dst: only in the same subnet as dst, 0=any dst | |
902 | * - local: address, 0=autoselect the local address | |
903 | * - scope: maximum allowed scope value for the local address | |
904 | */ | |
905 | u32 inet_confirm_addr(const struct net_device *dev, u32 dst, u32 local, int scope) | |
906 | { | |
907 | u32 addr = 0; | |
908 | struct in_device *in_dev; | |
909 | ||
910 | if (dev) { | |
911 | rcu_read_lock(); | |
e5ed6399 | 912 | if ((in_dev = __in_dev_get_rcu(dev))) |
1da177e4 LT |
913 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
914 | rcu_read_unlock(); | |
915 | ||
916 | return addr; | |
917 | } | |
918 | ||
919 | read_lock(&dev_base_lock); | |
920 | rcu_read_lock(); | |
921 | for (dev = dev_base; dev; dev = dev->next) { | |
e5ed6399 | 922 | if ((in_dev = __in_dev_get_rcu(dev))) { |
1da177e4 LT |
923 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
924 | if (addr) | |
925 | break; | |
926 | } | |
927 | } | |
928 | rcu_read_unlock(); | |
929 | read_unlock(&dev_base_lock); | |
930 | ||
931 | return addr; | |
932 | } | |
933 | ||
934 | /* | |
935 | * Device notifier | |
936 | */ | |
937 | ||
938 | int register_inetaddr_notifier(struct notifier_block *nb) | |
939 | { | |
e041c683 | 940 | return blocking_notifier_chain_register(&inetaddr_chain, nb); |
1da177e4 LT |
941 | } |
942 | ||
943 | int unregister_inetaddr_notifier(struct notifier_block *nb) | |
944 | { | |
e041c683 | 945 | return blocking_notifier_chain_unregister(&inetaddr_chain, nb); |
1da177e4 LT |
946 | } |
947 | ||
948 | /* Rename ifa_labels for a device name change. Make some effort to preserve existing | |
949 | * alias numbering and to create unique labels if possible. | |
950 | */ | |
951 | static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) | |
952 | { | |
953 | struct in_ifaddr *ifa; | |
954 | int named = 0; | |
955 | ||
956 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { | |
957 | char old[IFNAMSIZ], *dot; | |
958 | ||
959 | memcpy(old, ifa->ifa_label, IFNAMSIZ); | |
960 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
961 | if (named++ == 0) | |
962 | continue; | |
963 | dot = strchr(ifa->ifa_label, ':'); | |
964 | if (dot == NULL) { | |
965 | sprintf(old, ":%d", named); | |
966 | dot = old; | |
967 | } | |
968 | if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) { | |
969 | strcat(ifa->ifa_label, dot); | |
970 | } else { | |
971 | strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); | |
972 | } | |
973 | } | |
974 | } | |
975 | ||
976 | /* Called only under RTNL semaphore */ | |
977 | ||
978 | static int inetdev_event(struct notifier_block *this, unsigned long event, | |
979 | void *ptr) | |
980 | { | |
981 | struct net_device *dev = ptr; | |
e5ed6399 | 982 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
983 | |
984 | ASSERT_RTNL(); | |
985 | ||
986 | if (!in_dev) { | |
987 | if (event == NETDEV_REGISTER && dev == &loopback_dev) { | |
988 | in_dev = inetdev_init(dev); | |
989 | if (!in_dev) | |
990 | panic("devinet: Failed to create loopback\n"); | |
991 | in_dev->cnf.no_xfrm = 1; | |
992 | in_dev->cnf.no_policy = 1; | |
993 | } | |
994 | goto out; | |
995 | } | |
996 | ||
997 | switch (event) { | |
998 | case NETDEV_REGISTER: | |
999 | printk(KERN_DEBUG "inetdev_event: bug\n"); | |
1000 | dev->ip_ptr = NULL; | |
1001 | break; | |
1002 | case NETDEV_UP: | |
1003 | if (dev->mtu < 68) | |
1004 | break; | |
1005 | if (dev == &loopback_dev) { | |
1006 | struct in_ifaddr *ifa; | |
1007 | if ((ifa = inet_alloc_ifa()) != NULL) { | |
1008 | ifa->ifa_local = | |
1009 | ifa->ifa_address = htonl(INADDR_LOOPBACK); | |
1010 | ifa->ifa_prefixlen = 8; | |
1011 | ifa->ifa_mask = inet_make_mask(8); | |
1012 | in_dev_hold(in_dev); | |
1013 | ifa->ifa_dev = in_dev; | |
1014 | ifa->ifa_scope = RT_SCOPE_HOST; | |
1015 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
1016 | inet_insert_ifa(ifa); | |
1017 | } | |
1018 | } | |
1019 | ip_mc_up(in_dev); | |
1020 | break; | |
1021 | case NETDEV_DOWN: | |
1022 | ip_mc_down(in_dev); | |
1023 | break; | |
1024 | case NETDEV_CHANGEMTU: | |
1025 | if (dev->mtu >= 68) | |
1026 | break; | |
1027 | /* MTU falled under 68, disable IP */ | |
1028 | case NETDEV_UNREGISTER: | |
1029 | inetdev_destroy(in_dev); | |
1030 | break; | |
1031 | case NETDEV_CHANGENAME: | |
1032 | /* Do not notify about label change, this event is | |
1033 | * not interesting to applications using netlink. | |
1034 | */ | |
1035 | inetdev_changename(dev, in_dev); | |
1036 | ||
1037 | #ifdef CONFIG_SYSCTL | |
1038 | devinet_sysctl_unregister(&in_dev->cnf); | |
1039 | neigh_sysctl_unregister(in_dev->arp_parms); | |
1040 | neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4, | |
1041 | NET_IPV4_NEIGH, "ipv4", NULL, NULL); | |
1042 | devinet_sysctl_register(in_dev, &in_dev->cnf); | |
1043 | #endif | |
1044 | break; | |
1045 | } | |
1046 | out: | |
1047 | return NOTIFY_DONE; | |
1048 | } | |
1049 | ||
1050 | static struct notifier_block ip_netdev_notifier = { | |
1051 | .notifier_call =inetdev_event, | |
1052 | }; | |
1053 | ||
1054 | static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, | |
b6544c0b | 1055 | u32 pid, u32 seq, int event, unsigned int flags) |
1da177e4 LT |
1056 | { |
1057 | struct ifaddrmsg *ifm; | |
1058 | struct nlmsghdr *nlh; | |
1059 | unsigned char *b = skb->tail; | |
1060 | ||
b6544c0b | 1061 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags); |
1da177e4 LT |
1062 | ifm = NLMSG_DATA(nlh); |
1063 | ifm->ifa_family = AF_INET; | |
1064 | ifm->ifa_prefixlen = ifa->ifa_prefixlen; | |
1065 | ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; | |
1066 | ifm->ifa_scope = ifa->ifa_scope; | |
1067 | ifm->ifa_index = ifa->ifa_dev->dev->ifindex; | |
1068 | if (ifa->ifa_address) | |
1069 | RTA_PUT(skb, IFA_ADDRESS, 4, &ifa->ifa_address); | |
1070 | if (ifa->ifa_local) | |
1071 | RTA_PUT(skb, IFA_LOCAL, 4, &ifa->ifa_local); | |
1072 | if (ifa->ifa_broadcast) | |
1073 | RTA_PUT(skb, IFA_BROADCAST, 4, &ifa->ifa_broadcast); | |
1074 | if (ifa->ifa_anycast) | |
1075 | RTA_PUT(skb, IFA_ANYCAST, 4, &ifa->ifa_anycast); | |
1076 | if (ifa->ifa_label[0]) | |
1077 | RTA_PUT(skb, IFA_LABEL, IFNAMSIZ, &ifa->ifa_label); | |
1078 | nlh->nlmsg_len = skb->tail - b; | |
1079 | return skb->len; | |
1080 | ||
1081 | nlmsg_failure: | |
1082 | rtattr_failure: | |
1083 | skb_trim(skb, b - skb->data); | |
1084 | return -1; | |
1085 | } | |
1086 | ||
1087 | static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
1088 | { | |
1089 | int idx, ip_idx; | |
1090 | struct net_device *dev; | |
1091 | struct in_device *in_dev; | |
1092 | struct in_ifaddr *ifa; | |
1093 | int s_ip_idx, s_idx = cb->args[0]; | |
1094 | ||
1095 | s_ip_idx = ip_idx = cb->args[1]; | |
1096 | read_lock(&dev_base_lock); | |
1097 | for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) { | |
1098 | if (idx < s_idx) | |
1099 | continue; | |
1100 | if (idx > s_idx) | |
1101 | s_ip_idx = 0; | |
1102 | rcu_read_lock(); | |
e5ed6399 | 1103 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { |
1da177e4 LT |
1104 | rcu_read_unlock(); |
1105 | continue; | |
1106 | } | |
1107 | ||
1108 | for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; | |
1109 | ifa = ifa->ifa_next, ip_idx++) { | |
1110 | if (ip_idx < s_ip_idx) | |
1111 | continue; | |
1112 | if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid, | |
1113 | cb->nlh->nlmsg_seq, | |
b6544c0b | 1114 | RTM_NEWADDR, NLM_F_MULTI) <= 0) { |
1da177e4 LT |
1115 | rcu_read_unlock(); |
1116 | goto done; | |
1117 | } | |
1118 | } | |
1119 | rcu_read_unlock(); | |
1120 | } | |
1121 | ||
1122 | done: | |
1123 | read_unlock(&dev_base_lock); | |
1124 | cb->args[0] = idx; | |
1125 | cb->args[1] = ip_idx; | |
1126 | ||
1127 | return skb->len; | |
1128 | } | |
1129 | ||
1130 | static void rtmsg_ifa(int event, struct in_ifaddr* ifa) | |
1131 | { | |
1132 | int size = NLMSG_SPACE(sizeof(struct ifaddrmsg) + 128); | |
1133 | struct sk_buff *skb = alloc_skb(size, GFP_KERNEL); | |
1134 | ||
1135 | if (!skb) | |
ac6d439d | 1136 | netlink_set_err(rtnl, 0, RTNLGRP_IPV4_IFADDR, ENOBUFS); |
28633514 | 1137 | else if (inet_fill_ifaddr(skb, ifa, 0, 0, event, 0) < 0) { |
1da177e4 | 1138 | kfree_skb(skb); |
ac6d439d | 1139 | netlink_set_err(rtnl, 0, RTNLGRP_IPV4_IFADDR, EINVAL); |
1da177e4 | 1140 | } else { |
ac6d439d | 1141 | netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV4_IFADDR, GFP_KERNEL); |
1da177e4 LT |
1142 | } |
1143 | } | |
1144 | ||
db46edc6 TG |
1145 | static struct rtnetlink_link inet_rtnetlink_table[RTM_NR_MSGTYPES] = { |
1146 | [RTM_NEWADDR - RTM_BASE] = { .doit = inet_rtm_newaddr, }, | |
1147 | [RTM_DELADDR - RTM_BASE] = { .doit = inet_rtm_deladdr, }, | |
1148 | [RTM_GETADDR - RTM_BASE] = { .dumpit = inet_dump_ifaddr, }, | |
1149 | [RTM_NEWROUTE - RTM_BASE] = { .doit = inet_rtm_newroute, }, | |
1150 | [RTM_DELROUTE - RTM_BASE] = { .doit = inet_rtm_delroute, }, | |
1151 | [RTM_GETROUTE - RTM_BASE] = { .doit = inet_rtm_getroute, | |
1152 | .dumpit = inet_dump_fib, }, | |
1da177e4 | 1153 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
db46edc6 TG |
1154 | [RTM_NEWRULE - RTM_BASE] = { .doit = inet_rtm_newrule, }, |
1155 | [RTM_DELRULE - RTM_BASE] = { .doit = inet_rtm_delrule, }, | |
1156 | [RTM_GETRULE - RTM_BASE] = { .dumpit = inet_dump_rules, }, | |
1da177e4 LT |
1157 | #endif |
1158 | }; | |
1159 | ||
1160 | #ifdef CONFIG_SYSCTL | |
1161 | ||
1162 | void inet_forward_change(void) | |
1163 | { | |
1164 | struct net_device *dev; | |
1165 | int on = ipv4_devconf.forwarding; | |
1166 | ||
1167 | ipv4_devconf.accept_redirects = !on; | |
1168 | ipv4_devconf_dflt.forwarding = on; | |
1169 | ||
1170 | read_lock(&dev_base_lock); | |
1171 | for (dev = dev_base; dev; dev = dev->next) { | |
1172 | struct in_device *in_dev; | |
1173 | rcu_read_lock(); | |
e5ed6399 | 1174 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
1175 | if (in_dev) |
1176 | in_dev->cnf.forwarding = on; | |
1177 | rcu_read_unlock(); | |
1178 | } | |
1179 | read_unlock(&dev_base_lock); | |
1180 | ||
1181 | rt_cache_flush(0); | |
1182 | } | |
1183 | ||
1184 | static int devinet_sysctl_forward(ctl_table *ctl, int write, | |
1185 | struct file* filp, void __user *buffer, | |
1186 | size_t *lenp, loff_t *ppos) | |
1187 | { | |
1188 | int *valp = ctl->data; | |
1189 | int val = *valp; | |
1190 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1191 | ||
1192 | if (write && *valp != val) { | |
1193 | if (valp == &ipv4_devconf.forwarding) | |
1194 | inet_forward_change(); | |
1195 | else if (valp != &ipv4_devconf_dflt.forwarding) | |
1196 | rt_cache_flush(0); | |
1197 | } | |
1198 | ||
1199 | return ret; | |
1200 | } | |
1201 | ||
1202 | int ipv4_doint_and_flush(ctl_table *ctl, int write, | |
1203 | struct file* filp, void __user *buffer, | |
1204 | size_t *lenp, loff_t *ppos) | |
1205 | { | |
1206 | int *valp = ctl->data; | |
1207 | int val = *valp; | |
1208 | int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1209 | ||
1210 | if (write && *valp != val) | |
1211 | rt_cache_flush(0); | |
1212 | ||
1213 | return ret; | |
1214 | } | |
1215 | ||
1216 | int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen, | |
1217 | void __user *oldval, size_t __user *oldlenp, | |
1218 | void __user *newval, size_t newlen, | |
1219 | void **context) | |
1220 | { | |
1221 | int *valp = table->data; | |
1222 | int new; | |
1223 | ||
1224 | if (!newval || !newlen) | |
1225 | return 0; | |
1226 | ||
1227 | if (newlen != sizeof(int)) | |
1228 | return -EINVAL; | |
1229 | ||
1230 | if (get_user(new, (int __user *)newval)) | |
1231 | return -EFAULT; | |
1232 | ||
1233 | if (new == *valp) | |
1234 | return 0; | |
1235 | ||
1236 | if (oldval && oldlenp) { | |
1237 | size_t len; | |
1238 | ||
1239 | if (get_user(len, oldlenp)) | |
1240 | return -EFAULT; | |
1241 | ||
1242 | if (len) { | |
1243 | if (len > table->maxlen) | |
1244 | len = table->maxlen; | |
1245 | if (copy_to_user(oldval, valp, len)) | |
1246 | return -EFAULT; | |
1247 | if (put_user(len, oldlenp)) | |
1248 | return -EFAULT; | |
1249 | } | |
1250 | } | |
1251 | ||
1252 | *valp = new; | |
1253 | rt_cache_flush(0); | |
1254 | return 1; | |
1255 | } | |
1256 | ||
1257 | ||
1258 | static struct devinet_sysctl_table { | |
1259 | struct ctl_table_header *sysctl_header; | |
1260 | ctl_table devinet_vars[__NET_IPV4_CONF_MAX]; | |
1261 | ctl_table devinet_dev[2]; | |
1262 | ctl_table devinet_conf_dir[2]; | |
1263 | ctl_table devinet_proto_dir[2]; | |
1264 | ctl_table devinet_root_dir[2]; | |
1265 | } devinet_sysctl = { | |
1266 | .devinet_vars = { | |
1267 | { | |
1268 | .ctl_name = NET_IPV4_CONF_FORWARDING, | |
1269 | .procname = "forwarding", | |
1270 | .data = &ipv4_devconf.forwarding, | |
1271 | .maxlen = sizeof(int), | |
1272 | .mode = 0644, | |
1273 | .proc_handler = &devinet_sysctl_forward, | |
1274 | }, | |
1275 | { | |
1276 | .ctl_name = NET_IPV4_CONF_MC_FORWARDING, | |
1277 | .procname = "mc_forwarding", | |
1278 | .data = &ipv4_devconf.mc_forwarding, | |
1279 | .maxlen = sizeof(int), | |
1280 | .mode = 0444, | |
1281 | .proc_handler = &proc_dointvec, | |
1282 | }, | |
1283 | { | |
1284 | .ctl_name = NET_IPV4_CONF_ACCEPT_REDIRECTS, | |
1285 | .procname = "accept_redirects", | |
1286 | .data = &ipv4_devconf.accept_redirects, | |
1287 | .maxlen = sizeof(int), | |
1288 | .mode = 0644, | |
1289 | .proc_handler = &proc_dointvec, | |
1290 | }, | |
1291 | { | |
1292 | .ctl_name = NET_IPV4_CONF_SECURE_REDIRECTS, | |
1293 | .procname = "secure_redirects", | |
1294 | .data = &ipv4_devconf.secure_redirects, | |
1295 | .maxlen = sizeof(int), | |
1296 | .mode = 0644, | |
1297 | .proc_handler = &proc_dointvec, | |
1298 | }, | |
1299 | { | |
1300 | .ctl_name = NET_IPV4_CONF_SHARED_MEDIA, | |
1301 | .procname = "shared_media", | |
1302 | .data = &ipv4_devconf.shared_media, | |
1303 | .maxlen = sizeof(int), | |
1304 | .mode = 0644, | |
1305 | .proc_handler = &proc_dointvec, | |
1306 | }, | |
1307 | { | |
1308 | .ctl_name = NET_IPV4_CONF_RP_FILTER, | |
1309 | .procname = "rp_filter", | |
1310 | .data = &ipv4_devconf.rp_filter, | |
1311 | .maxlen = sizeof(int), | |
1312 | .mode = 0644, | |
1313 | .proc_handler = &proc_dointvec, | |
1314 | }, | |
1315 | { | |
1316 | .ctl_name = NET_IPV4_CONF_SEND_REDIRECTS, | |
1317 | .procname = "send_redirects", | |
1318 | .data = &ipv4_devconf.send_redirects, | |
1319 | .maxlen = sizeof(int), | |
1320 | .mode = 0644, | |
1321 | .proc_handler = &proc_dointvec, | |
1322 | }, | |
1323 | { | |
1324 | .ctl_name = NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE, | |
1325 | .procname = "accept_source_route", | |
1326 | .data = &ipv4_devconf.accept_source_route, | |
1327 | .maxlen = sizeof(int), | |
1328 | .mode = 0644, | |
1329 | .proc_handler = &proc_dointvec, | |
1330 | }, | |
1331 | { | |
1332 | .ctl_name = NET_IPV4_CONF_PROXY_ARP, | |
1333 | .procname = "proxy_arp", | |
1334 | .data = &ipv4_devconf.proxy_arp, | |
1335 | .maxlen = sizeof(int), | |
1336 | .mode = 0644, | |
1337 | .proc_handler = &proc_dointvec, | |
1338 | }, | |
1339 | { | |
1340 | .ctl_name = NET_IPV4_CONF_MEDIUM_ID, | |
1341 | .procname = "medium_id", | |
1342 | .data = &ipv4_devconf.medium_id, | |
1343 | .maxlen = sizeof(int), | |
1344 | .mode = 0644, | |
1345 | .proc_handler = &proc_dointvec, | |
1346 | }, | |
1347 | { | |
1348 | .ctl_name = NET_IPV4_CONF_BOOTP_RELAY, | |
1349 | .procname = "bootp_relay", | |
1350 | .data = &ipv4_devconf.bootp_relay, | |
1351 | .maxlen = sizeof(int), | |
1352 | .mode = 0644, | |
1353 | .proc_handler = &proc_dointvec, | |
1354 | }, | |
1355 | { | |
1356 | .ctl_name = NET_IPV4_CONF_LOG_MARTIANS, | |
1357 | .procname = "log_martians", | |
1358 | .data = &ipv4_devconf.log_martians, | |
1359 | .maxlen = sizeof(int), | |
1360 | .mode = 0644, | |
1361 | .proc_handler = &proc_dointvec, | |
1362 | }, | |
1363 | { | |
1364 | .ctl_name = NET_IPV4_CONF_TAG, | |
1365 | .procname = "tag", | |
1366 | .data = &ipv4_devconf.tag, | |
1367 | .maxlen = sizeof(int), | |
1368 | .mode = 0644, | |
1369 | .proc_handler = &proc_dointvec, | |
1370 | }, | |
1371 | { | |
1372 | .ctl_name = NET_IPV4_CONF_ARPFILTER, | |
1373 | .procname = "arp_filter", | |
1374 | .data = &ipv4_devconf.arp_filter, | |
1375 | .maxlen = sizeof(int), | |
1376 | .mode = 0644, | |
1377 | .proc_handler = &proc_dointvec, | |
1378 | }, | |
1379 | { | |
1380 | .ctl_name = NET_IPV4_CONF_ARP_ANNOUNCE, | |
1381 | .procname = "arp_announce", | |
1382 | .data = &ipv4_devconf.arp_announce, | |
1383 | .maxlen = sizeof(int), | |
1384 | .mode = 0644, | |
1385 | .proc_handler = &proc_dointvec, | |
1386 | }, | |
1387 | { | |
1388 | .ctl_name = NET_IPV4_CONF_ARP_IGNORE, | |
1389 | .procname = "arp_ignore", | |
1390 | .data = &ipv4_devconf.arp_ignore, | |
1391 | .maxlen = sizeof(int), | |
abd596a4 NH |
1392 | .mode = 0644, |
1393 | .proc_handler = &proc_dointvec, | |
1394 | }, | |
1395 | { | |
1396 | .ctl_name = NET_IPV4_CONF_ARP_ACCEPT, | |
1397 | .procname = "arp_accept", | |
1398 | .data = &ipv4_devconf.arp_accept, | |
1399 | .maxlen = sizeof(int), | |
1da177e4 LT |
1400 | .mode = 0644, |
1401 | .proc_handler = &proc_dointvec, | |
1402 | }, | |
1403 | { | |
1404 | .ctl_name = NET_IPV4_CONF_NOXFRM, | |
1405 | .procname = "disable_xfrm", | |
1406 | .data = &ipv4_devconf.no_xfrm, | |
1407 | .maxlen = sizeof(int), | |
1408 | .mode = 0644, | |
1409 | .proc_handler = &ipv4_doint_and_flush, | |
1410 | .strategy = &ipv4_doint_and_flush_strategy, | |
1411 | }, | |
1412 | { | |
1413 | .ctl_name = NET_IPV4_CONF_NOPOLICY, | |
1414 | .procname = "disable_policy", | |
1415 | .data = &ipv4_devconf.no_policy, | |
1416 | .maxlen = sizeof(int), | |
1417 | .mode = 0644, | |
1418 | .proc_handler = &ipv4_doint_and_flush, | |
1419 | .strategy = &ipv4_doint_and_flush_strategy, | |
1420 | }, | |
1421 | { | |
1422 | .ctl_name = NET_IPV4_CONF_FORCE_IGMP_VERSION, | |
1423 | .procname = "force_igmp_version", | |
1424 | .data = &ipv4_devconf.force_igmp_version, | |
1425 | .maxlen = sizeof(int), | |
1426 | .mode = 0644, | |
8f937c60 HW |
1427 | .proc_handler = &ipv4_doint_and_flush, |
1428 | .strategy = &ipv4_doint_and_flush_strategy, | |
1429 | }, | |
1430 | { | |
1431 | .ctl_name = NET_IPV4_CONF_PROMOTE_SECONDARIES, | |
1432 | .procname = "promote_secondaries", | |
1433 | .data = &ipv4_devconf.promote_secondaries, | |
1434 | .maxlen = sizeof(int), | |
1435 | .mode = 0644, | |
1da177e4 LT |
1436 | .proc_handler = &ipv4_doint_and_flush, |
1437 | .strategy = &ipv4_doint_and_flush_strategy, | |
1438 | }, | |
1439 | }, | |
1440 | .devinet_dev = { | |
1441 | { | |
1442 | .ctl_name = NET_PROTO_CONF_ALL, | |
1443 | .procname = "all", | |
1444 | .mode = 0555, | |
1445 | .child = devinet_sysctl.devinet_vars, | |
1446 | }, | |
1447 | }, | |
1448 | .devinet_conf_dir = { | |
1449 | { | |
1450 | .ctl_name = NET_IPV4_CONF, | |
1451 | .procname = "conf", | |
1452 | .mode = 0555, | |
1453 | .child = devinet_sysctl.devinet_dev, | |
1454 | }, | |
1455 | }, | |
1456 | .devinet_proto_dir = { | |
1457 | { | |
1458 | .ctl_name = NET_IPV4, | |
1459 | .procname = "ipv4", | |
1460 | .mode = 0555, | |
1461 | .child = devinet_sysctl.devinet_conf_dir, | |
1462 | }, | |
1463 | }, | |
1464 | .devinet_root_dir = { | |
1465 | { | |
1466 | .ctl_name = CTL_NET, | |
1467 | .procname = "net", | |
1468 | .mode = 0555, | |
1469 | .child = devinet_sysctl.devinet_proto_dir, | |
1470 | }, | |
1471 | }, | |
1472 | }; | |
1473 | ||
1474 | static void devinet_sysctl_register(struct in_device *in_dev, | |
1475 | struct ipv4_devconf *p) | |
1476 | { | |
1477 | int i; | |
1478 | struct net_device *dev = in_dev ? in_dev->dev : NULL; | |
1479 | struct devinet_sysctl_table *t = kmalloc(sizeof(*t), GFP_KERNEL); | |
1480 | char *dev_name = NULL; | |
1481 | ||
1482 | if (!t) | |
1483 | return; | |
1484 | memcpy(t, &devinet_sysctl, sizeof(*t)); | |
1485 | for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { | |
1486 | t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; | |
1487 | t->devinet_vars[i].de = NULL; | |
1488 | } | |
1489 | ||
1490 | if (dev) { | |
1491 | dev_name = dev->name; | |
1492 | t->devinet_dev[0].ctl_name = dev->ifindex; | |
1493 | } else { | |
1494 | dev_name = "default"; | |
1495 | t->devinet_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT; | |
1496 | } | |
1497 | ||
1498 | /* | |
1499 | * Make a copy of dev_name, because '.procname' is regarded as const | |
1500 | * by sysctl and we wouldn't want anyone to change it under our feet | |
1501 | * (see SIOCSIFNAME). | |
1502 | */ | |
543537bd | 1503 | dev_name = kstrdup(dev_name, GFP_KERNEL); |
1da177e4 LT |
1504 | if (!dev_name) |
1505 | goto free; | |
1506 | ||
1507 | t->devinet_dev[0].procname = dev_name; | |
1508 | t->devinet_dev[0].child = t->devinet_vars; | |
1509 | t->devinet_dev[0].de = NULL; | |
1510 | t->devinet_conf_dir[0].child = t->devinet_dev; | |
1511 | t->devinet_conf_dir[0].de = NULL; | |
1512 | t->devinet_proto_dir[0].child = t->devinet_conf_dir; | |
1513 | t->devinet_proto_dir[0].de = NULL; | |
1514 | t->devinet_root_dir[0].child = t->devinet_proto_dir; | |
1515 | t->devinet_root_dir[0].de = NULL; | |
1516 | ||
1517 | t->sysctl_header = register_sysctl_table(t->devinet_root_dir, 0); | |
1518 | if (!t->sysctl_header) | |
1519 | goto free_procname; | |
1520 | ||
1521 | p->sysctl = t; | |
1522 | return; | |
1523 | ||
1524 | /* error path */ | |
1525 | free_procname: | |
1526 | kfree(dev_name); | |
1527 | free: | |
1528 | kfree(t); | |
1529 | return; | |
1530 | } | |
1531 | ||
1532 | static void devinet_sysctl_unregister(struct ipv4_devconf *p) | |
1533 | { | |
1534 | if (p->sysctl) { | |
1535 | struct devinet_sysctl_table *t = p->sysctl; | |
1536 | p->sysctl = NULL; | |
1537 | unregister_sysctl_table(t->sysctl_header); | |
1538 | kfree(t->devinet_dev[0].procname); | |
1539 | kfree(t); | |
1540 | } | |
1541 | } | |
1542 | #endif | |
1543 | ||
1544 | void __init devinet_init(void) | |
1545 | { | |
1546 | register_gifconf(PF_INET, inet_gifconf); | |
1547 | register_netdevice_notifier(&ip_netdev_notifier); | |
1548 | rtnetlink_links[PF_INET] = inet_rtnetlink_table; | |
1549 | #ifdef CONFIG_SYSCTL | |
1550 | devinet_sysctl.sysctl_header = | |
1551 | register_sysctl_table(devinet_sysctl.devinet_root_dir, 0); | |
1552 | devinet_sysctl_register(NULL, &ipv4_devconf_dflt); | |
1553 | #endif | |
1554 | } | |
1555 | ||
1da177e4 LT |
1556 | EXPORT_SYMBOL(in_dev_finish_destroy); |
1557 | EXPORT_SYMBOL(inet_select_addr); | |
1558 | EXPORT_SYMBOL(inetdev_by_index); | |
1559 | EXPORT_SYMBOL(register_inetaddr_notifier); | |
1560 | EXPORT_SYMBOL(unregister_inetaddr_notifier); |