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1.1 misho 1: /*
2: * Copyright (C) 2012 Tobias Brunner
3: * Copyright (C) 2012 Giuliano Grassi
4: * Copyright (C) 2012 Ralf Sager
5: * HSR Hochschule fuer Technik Rapperswil
6: *
7: * This program is free software; you can redistribute it and/or modify it
8: * under the terms of the GNU General Public License as published by the
9: * Free Software Foundation; either version 2 of the License, or (at your
10: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
11: *
12: * This program is distributed in the hope that it will be useful, but
13: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15: * for more details.
16: */
17:
18: #include "ipsec.h"
19: #include "ipsec_sa.h"
20:
21: #include <library.h>
22: #include <utils/debug.h>
23:
24: typedef struct private_ipsec_sa_t private_ipsec_sa_t;
25:
26: /**
27: * Private additions to ipsec_sa_t.
28: */
29: struct private_ipsec_sa_t {
30:
31: /**
32: * Public members
33: */
34: ipsec_sa_t public;
35:
36: /**
37: * SPI of this SA
38: */
39: uint32_t spi;
40:
41: /**
42: * Source address
43: */
44: host_t *src;
45:
46: /**
47: * Destination address
48: */
49: host_t *dst;
50:
51: /**
52: * Protocol
53: */
54: uint8_t protocol;
55:
56: /**
57: * Reqid of this SA
58: */
59: uint32_t reqid;
60:
61: /**
62: * Lifetime configuration
63: */
64: lifetime_cfg_t lifetime;
65:
66: /**
67: * IPsec mode
68: */
69: ipsec_mode_t mode;
70:
71: /**
72: * TRUE if extended sequence numbers are used
73: */
74: bool esn;
75:
76: /**
77: * TRUE if this is an inbound SA
78: */
79: bool inbound;
80:
81: /**
82: * ESP context
83: */
84: esp_context_t *esp_context;
85:
86: /**
87: * Usage statistics
88: */
89: struct {
90: /** last time of use */
91: time_t time;
92: /** number of packets processed */
93: uint64_t packets;
94: /** number of bytes processed */
95: uint64_t bytes;
96: } use;
97:
98: /**
99: * Has the SA soft-expired?
100: */
101: bool soft_expired;
102:
103: /**
104: * Has the SA hard-expired?
105: */
106: bool hard_expired;
107: };
108:
109: METHOD(ipsec_sa_t, get_source, host_t*,
110: private_ipsec_sa_t *this)
111: {
112: return this->src;
113: }
114:
115: METHOD(ipsec_sa_t, get_destination, host_t*,
116: private_ipsec_sa_t *this)
117: {
118: return this->dst;
119: }
120:
121: METHOD(ipsec_sa_t, set_source, void,
122: private_ipsec_sa_t *this, host_t *addr)
123: {
124: this->src->destroy(this->src);
125: this->src = addr->clone(addr);
126: }
127:
128: METHOD(ipsec_sa_t, set_destination, void,
129: private_ipsec_sa_t *this, host_t *addr)
130: {
131: this->dst->destroy(this->dst);
132: this->dst = addr->clone(addr);
133: }
134:
135: METHOD(ipsec_sa_t, get_spi, uint32_t,
136: private_ipsec_sa_t *this)
137: {
138: return this->spi;
139: }
140:
141: METHOD(ipsec_sa_t, get_reqid, uint32_t,
142: private_ipsec_sa_t *this)
143: {
144: return this->reqid;
145: }
146:
147: METHOD(ipsec_sa_t, get_protocol, uint8_t,
148: private_ipsec_sa_t *this)
149: {
150: return this->protocol;
151: }
152:
153: METHOD(ipsec_sa_t, get_lifetime, lifetime_cfg_t*,
154: private_ipsec_sa_t *this)
155: {
156: return &this->lifetime;
157: }
158:
159: METHOD(ipsec_sa_t, is_inbound, bool,
160: private_ipsec_sa_t *this)
161: {
162: return this->inbound;
163: }
164:
165: METHOD(ipsec_sa_t, get_esp_context, esp_context_t*,
166: private_ipsec_sa_t *this)
167: {
168: return this->esp_context;
169: }
170:
171: METHOD(ipsec_sa_t, get_usestats, void,
172: private_ipsec_sa_t *this, uint64_t *bytes, uint64_t *packets,
173: time_t *time)
174: {
175: if (bytes)
176: {
177: *bytes = this->use.bytes;
178: }
179: if (packets)
180: {
181: *packets = this->use.packets;
182: }
183: if (time)
184: {
185: *time = this->use.time;
186: }
187: }
188:
189: METHOD(ipsec_sa_t, expire, void,
190: private_ipsec_sa_t *this, bool hard)
191: {
192: if (hard)
193: {
194: if (!this->hard_expired)
195: {
196: this->hard_expired = TRUE;
197: ipsec->events->expire(ipsec->events, this->protocol, this->spi,
198: this->dst, TRUE);
199: }
200: }
201: else
202: {
203: if (!this->hard_expired && !this->soft_expired)
204: {
205: this->soft_expired = TRUE;
206: ipsec->events->expire(ipsec->events, this->protocol, this->spi,
207: this->dst, FALSE);
208: }
209: }
210: }
211:
212: METHOD(ipsec_sa_t, update_usestats, void,
213: private_ipsec_sa_t *this, uint32_t bytes)
214: {
215: this->use.time = time_monotonic(NULL);
216: this->use.packets++;
217: this->use.bytes += bytes;
218:
219: if (this->lifetime.packets.life &&
220: this->use.packets >= this->lifetime.packets.life)
221: {
222: return expire(this, TRUE);
223: }
224: if (this->lifetime.bytes.life &&
225: this->use.bytes >= this->lifetime.bytes.life)
226: {
227: return expire(this, TRUE);
228: }
229: if (this->lifetime.packets.rekey &&
230: this->use.packets >= this->lifetime.packets.rekey)
231: {
232: return expire(this, FALSE);
233: }
234: if (this->lifetime.bytes.rekey &&
235: this->use.bytes >= this->lifetime.bytes.rekey)
236: {
237: return expire(this, FALSE);
238: }
239: }
240:
241: METHOD(ipsec_sa_t, match_by_spi_dst, bool,
242: private_ipsec_sa_t *this, uint32_t spi, host_t *dst)
243: {
244: return this->spi == spi && this->dst->ip_equals(this->dst, dst) &&
245: !this->hard_expired;
246: }
247:
248: METHOD(ipsec_sa_t, match_by_spi_src_dst, bool,
249: private_ipsec_sa_t *this, uint32_t spi, host_t *src, host_t *dst)
250: {
251: return this->spi == spi && this->src->ip_equals(this->src, src) &&
252: this->dst->ip_equals(this->dst, dst);
253: }
254:
255: METHOD(ipsec_sa_t, match_by_reqid, bool,
256: private_ipsec_sa_t *this, uint32_t reqid, bool inbound)
257: {
258: return this->reqid == reqid && this->inbound == inbound &&
259: !this->hard_expired;
260: }
261:
262: METHOD(ipsec_sa_t, destroy, void,
263: private_ipsec_sa_t *this)
264: {
265: this->src->destroy(this->src);
266: this->dst->destroy(this->dst);
267: DESTROY_IF(this->esp_context);
268: free(this);
269: }
270:
271: /**
272: * Described in header.
273: */
274: ipsec_sa_t *ipsec_sa_create(uint32_t spi, host_t *src, host_t *dst,
275: uint8_t protocol, uint32_t reqid, mark_t mark, uint32_t tfc,
276: lifetime_cfg_t *lifetime, uint16_t enc_alg, chunk_t enc_key,
277: uint16_t int_alg, chunk_t int_key, ipsec_mode_t mode,
278: uint16_t ipcomp, uint16_t cpi, bool encap, bool esn, bool inbound)
279: {
280: private_ipsec_sa_t *this;
281:
282: if (protocol != IPPROTO_ESP)
283: {
284: DBG1(DBG_ESP, " IPsec SA: protocol not supported");
285: return NULL;
286: }
287: if (!encap)
288: {
289: DBG1(DBG_ESP, " IPsec SA: only UDP encapsulation is supported");
290: return NULL;
291: }
292: if (esn)
293: {
294: DBG1(DBG_ESP, " IPsec SA: ESN not supported");
295: return NULL;
296: }
297: if (ipcomp != IPCOMP_NONE)
298: {
299: DBG1(DBG_ESP, " IPsec SA: compression not supported");
300: return NULL;
301: }
302: if (mode != MODE_TUNNEL)
303: {
304: DBG1(DBG_ESP, " IPsec SA: unsupported mode");
305: return NULL;
306: }
307:
308: INIT(this,
309: .public = {
310: .destroy = _destroy,
311: .get_source = _get_source,
312: .get_destination = _get_destination,
313: .set_source = _set_source,
314: .set_destination = _set_destination,
315: .get_spi = _get_spi,
316: .get_reqid = _get_reqid,
317: .get_protocol = _get_protocol,
318: .get_lifetime = _get_lifetime,
319: .is_inbound = _is_inbound,
320: .match_by_spi_dst = _match_by_spi_dst,
321: .match_by_spi_src_dst = _match_by_spi_src_dst,
322: .match_by_reqid = _match_by_reqid,
323: .get_esp_context = _get_esp_context,
324: .get_usestats = _get_usestats,
325: .update_usestats = _update_usestats,
326: .expire = _expire,
327: },
328: .spi = spi,
329: .src = src->clone(src),
330: .dst = dst->clone(dst),
331: .lifetime = *lifetime,
332: .protocol = protocol,
333: .reqid = reqid,
334: .mode = mode,
335: .esn = esn,
336: .inbound = inbound,
337: );
338:
339: this->esp_context = esp_context_create(enc_alg, enc_key, int_alg, int_key,
340: inbound);
341: if (!this->esp_context)
342: {
343: destroy(this);
344: return NULL;
345: }
346: return &this->public;
347: }