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Paul Moore61e10682008-10-10 10:16:32 -04001/*
2 * NetLabel Network Address Lists
3 *
4 * This file contains network address list functions used to manage ordered
5 * lists of network addresses for use by the NetLabel subsystem. The NetLabel
6 * system manages static and dynamic label mappings for network protocols such
7 * as CIPSO and RIPSO.
8 *
9 * Author: Paul Moore <paul.moore@hp.com>
10 *
11 */
12
13/*
14 * (c) Copyright Hewlett-Packard Development Company, L.P., 2008
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
24 * the GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 *
30 */
31
32#include <linux/types.h>
33#include <linux/rcupdate.h>
34#include <linux/list.h>
35#include <linux/spinlock.h>
36#include <linux/in.h>
37#include <linux/in6.h>
38#include <linux/ip.h>
39#include <linux/ipv6.h>
40#include <net/ip.h>
41#include <net/ipv6.h>
Paul Moore63c41682008-10-10 10:16:32 -040042#include <linux/audit.h>
Paul Moore61e10682008-10-10 10:16:32 -040043
44#include "netlabel_addrlist.h"
45
46/*
47 * Address List Functions
48 */
49
50/**
51 * netlbl_af4list_search - Search for a matching IPv4 address entry
52 * @addr: IPv4 address
53 * @head: the list head
54 *
55 * Description:
56 * Searches the IPv4 address list given by @head. If a matching address entry
57 * is found it is returned, otherwise NULL is returned. The caller is
58 * responsible for calling the rcu_read_[un]lock() functions.
59 *
60 */
61struct netlbl_af4list *netlbl_af4list_search(__be32 addr,
62 struct list_head *head)
63{
64 struct netlbl_af4list *iter;
65
66 list_for_each_entry_rcu(iter, head, list)
67 if (iter->valid && (addr & iter->mask) == iter->addr)
68 return iter;
69
70 return NULL;
71}
72
Paul Moore63c41682008-10-10 10:16:32 -040073/**
74 * netlbl_af4list_search_exact - Search for an exact IPv4 address entry
75 * @addr: IPv4 address
76 * @mask: IPv4 address mask
77 * @head: the list head
78 *
79 * Description:
80 * Searches the IPv4 address list given by @head. If an exact match if found
81 * it is returned, otherwise NULL is returned. The caller is responsible for
82 * calling the rcu_read_[un]lock() functions.
83 *
84 */
85struct netlbl_af4list *netlbl_af4list_search_exact(__be32 addr,
86 __be32 mask,
87 struct list_head *head)
88{
89 struct netlbl_af4list *iter;
90
91 list_for_each_entry_rcu(iter, head, list)
92 if (iter->valid && iter->addr == addr && iter->mask == mask)
93 return iter;
94
95 return NULL;
96}
97
98
Paul Moore61e10682008-10-10 10:16:32 -040099#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
100/**
101 * netlbl_af6list_search - Search for a matching IPv6 address entry
102 * @addr: IPv6 address
103 * @head: the list head
104 *
105 * Description:
106 * Searches the IPv6 address list given by @head. If a matching address entry
107 * is found it is returned, otherwise NULL is returned. The caller is
108 * responsible for calling the rcu_read_[un]lock() functions.
109 *
110 */
111struct netlbl_af6list *netlbl_af6list_search(const struct in6_addr *addr,
112 struct list_head *head)
113{
114 struct netlbl_af6list *iter;
115
116 list_for_each_entry_rcu(iter, head, list)
117 if (iter->valid &&
118 ipv6_masked_addr_cmp(&iter->addr, &iter->mask, addr) == 0)
119 return iter;
120
121 return NULL;
122}
Paul Moore63c41682008-10-10 10:16:32 -0400123
124/**
125 * netlbl_af6list_search_exact - Search for an exact IPv6 address entry
126 * @addr: IPv6 address
127 * @mask: IPv6 address mask
128 * @head: the list head
129 *
130 * Description:
131 * Searches the IPv6 address list given by @head. If an exact match if found
132 * it is returned, otherwise NULL is returned. The caller is responsible for
133 * calling the rcu_read_[un]lock() functions.
134 *
135 */
136struct netlbl_af6list *netlbl_af6list_search_exact(const struct in6_addr *addr,
137 const struct in6_addr *mask,
138 struct list_head *head)
139{
140 struct netlbl_af6list *iter;
141
142 list_for_each_entry_rcu(iter, head, list)
143 if (iter->valid &&
144 ipv6_addr_equal(&iter->addr, addr) &&
145 ipv6_addr_equal(&iter->mask, mask))
146 return iter;
147
148 return NULL;
149}
Paul Moore61e10682008-10-10 10:16:32 -0400150#endif /* IPv6 */
151
152/**
153 * netlbl_af4list_add - Add a new IPv4 address entry to a list
154 * @entry: address entry
155 * @head: the list head
156 *
157 * Description:
158 * Add a new address entry to the list pointed to by @head. On success zero is
159 * returned, otherwise a negative value is returned. The caller is responsible
160 * for calling the necessary locking functions.
161 *
162 */
163int netlbl_af4list_add(struct netlbl_af4list *entry, struct list_head *head)
164{
165 struct netlbl_af4list *iter;
166
167 iter = netlbl_af4list_search(entry->addr, head);
168 if (iter != NULL &&
169 iter->addr == entry->addr && iter->mask == entry->mask)
170 return -EEXIST;
171
172 /* in order to speed up address searches through the list (the common
173 * case) we need to keep the list in order based on the size of the
174 * address mask such that the entry with the widest mask (smallest
175 * numerical value) appears first in the list */
176 list_for_each_entry_rcu(iter, head, list)
177 if (iter->valid &&
178 ntohl(entry->mask) > ntohl(iter->mask)) {
179 __list_add_rcu(&entry->list,
180 iter->list.prev,
181 &iter->list);
182 return 0;
183 }
184 list_add_tail_rcu(&entry->list, head);
185 return 0;
186}
187
188#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
189/**
190 * netlbl_af6list_add - Add a new IPv6 address entry to a list
191 * @entry: address entry
192 * @head: the list head
193 *
194 * Description:
195 * Add a new address entry to the list pointed to by @head. On success zero is
196 * returned, otherwise a negative value is returned. The caller is responsible
197 * for calling the necessary locking functions.
198 *
199 */
200int netlbl_af6list_add(struct netlbl_af6list *entry, struct list_head *head)
201{
202 struct netlbl_af6list *iter;
203
204 iter = netlbl_af6list_search(&entry->addr, head);
205 if (iter != NULL &&
206 ipv6_addr_equal(&iter->addr, &entry->addr) &&
207 ipv6_addr_equal(&iter->mask, &entry->mask))
208 return -EEXIST;
209
210 /* in order to speed up address searches through the list (the common
211 * case) we need to keep the list in order based on the size of the
212 * address mask such that the entry with the widest mask (smallest
213 * numerical value) appears first in the list */
214 list_for_each_entry_rcu(iter, head, list)
215 if (iter->valid &&
216 ipv6_addr_cmp(&entry->mask, &iter->mask) > 0) {
217 __list_add_rcu(&entry->list,
218 iter->list.prev,
219 &iter->list);
220 return 0;
221 }
222 list_add_tail_rcu(&entry->list, head);
223 return 0;
224}
225#endif /* IPv6 */
226
227/**
228 * netlbl_af4list_remove_entry - Remove an IPv4 address entry
229 * @entry: address entry
230 *
231 * Description:
232 * Remove the specified IP address entry. The caller is responsible for
233 * calling the necessary locking functions.
234 *
235 */
236void netlbl_af4list_remove_entry(struct netlbl_af4list *entry)
237{
238 entry->valid = 0;
239 list_del_rcu(&entry->list);
240}
241
242/**
243 * netlbl_af4list_remove - Remove an IPv4 address entry
244 * @addr: IP address
245 * @mask: IP address mask
246 * @head: the list head
247 *
248 * Description:
249 * Remove an IP address entry from the list pointed to by @head. Returns the
250 * entry on success, NULL on failure. The caller is responsible for calling
251 * the necessary locking functions.
252 *
253 */
254struct netlbl_af4list *netlbl_af4list_remove(__be32 addr, __be32 mask,
255 struct list_head *head)
256{
257 struct netlbl_af4list *entry;
258
259 entry = netlbl_af4list_search(addr, head);
260 if (entry != NULL && entry->addr == addr && entry->mask == mask) {
261 netlbl_af4list_remove_entry(entry);
262 return entry;
263 }
264
265 return NULL;
266}
267
268#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
269/**
270 * netlbl_af6list_remove_entry - Remove an IPv6 address entry
271 * @entry: address entry
272 *
273 * Description:
274 * Remove the specified IP address entry. The caller is responsible for
275 * calling the necessary locking functions.
276 *
277 */
278void netlbl_af6list_remove_entry(struct netlbl_af6list *entry)
279{
280 entry->valid = 0;
281 list_del_rcu(&entry->list);
282}
283
284/**
285 * netlbl_af6list_remove - Remove an IPv6 address entry
286 * @addr: IP address
287 * @mask: IP address mask
288 * @head: the list head
289 *
290 * Description:
291 * Remove an IP address entry from the list pointed to by @head. Returns the
292 * entry on success, NULL on failure. The caller is responsible for calling
293 * the necessary locking functions.
294 *
295 */
296struct netlbl_af6list *netlbl_af6list_remove(const struct in6_addr *addr,
297 const struct in6_addr *mask,
298 struct list_head *head)
299{
300 struct netlbl_af6list *entry;
301
302 entry = netlbl_af6list_search(addr, head);
303 if (entry != NULL &&
304 ipv6_addr_equal(&entry->addr, addr) &&
305 ipv6_addr_equal(&entry->mask, mask)) {
306 netlbl_af6list_remove_entry(entry);
307 return entry;
308 }
309
310 return NULL;
311}
312#endif /* IPv6 */
Paul Moore63c41682008-10-10 10:16:32 -0400313
314/*
315 * Audit Helper Functions
316 */
317
318/**
319 * netlbl_af4list_audit_addr - Audit an IPv4 address
320 * @audit_buf: audit buffer
321 * @src: true if source address, false if destination
322 * @dev: network interface
323 * @addr: IP address
324 * @mask: IP address mask
325 *
326 * Description:
327 * Write the IPv4 address and address mask, if necessary, to @audit_buf.
328 *
329 */
330void netlbl_af4list_audit_addr(struct audit_buffer *audit_buf,
331 int src, const char *dev,
332 __be32 addr, __be32 mask)
333{
334 u32 mask_val = ntohl(mask);
335 char *dir = (src ? "src" : "dst");
336
337 if (dev != NULL)
338 audit_log_format(audit_buf, " netif=%s", dev);
339 audit_log_format(audit_buf, " %s=" NIPQUAD_FMT, dir, NIPQUAD(addr));
340 if (mask_val != 0xffffffff) {
341 u32 mask_len = 0;
342 while (mask_val > 0) {
343 mask_val <<= 1;
344 mask_len++;
345 }
346 audit_log_format(audit_buf, " %s_prefixlen=%d", dir, mask_len);
347 }
348}
349
350#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
351/**
352 * netlbl_af6list_audit_addr - Audit an IPv6 address
353 * @audit_buf: audit buffer
354 * @src: true if source address, false if destination
355 * @dev: network interface
356 * @addr: IP address
357 * @mask: IP address mask
358 *
359 * Description:
360 * Write the IPv6 address and address mask, if necessary, to @audit_buf.
361 *
362 */
363void netlbl_af6list_audit_addr(struct audit_buffer *audit_buf,
364 int src,
365 const char *dev,
366 const struct in6_addr *addr,
367 const struct in6_addr *mask)
368{
369 char *dir = (src ? "src" : "dst");
370
371 if (dev != NULL)
372 audit_log_format(audit_buf, " netif=%s", dev);
373 audit_log_format(audit_buf, " %s=" NIP6_FMT, dir, NIP6(*addr));
374 if (ntohl(mask->s6_addr32[3]) != 0xffffffff) {
375 u32 mask_len = 0;
376 u32 mask_val;
377 int iter = -1;
378 while (ntohl(mask->s6_addr32[++iter]) == 0xffffffff)
379 mask_len += 32;
380 mask_val = ntohl(mask->s6_addr32[iter]);
381 while (mask_val > 0) {
382 mask_val <<= 1;
383 mask_len++;
384 }
385 audit_log_format(audit_buf, " %s_prefixlen=%d", dir, mask_len);
386 }
387}
388#endif /* IPv6 */