Annotation of embedaddon/strongswan/src/libcharon/encoding/payloads/ts_payload.c, revision 1.1
1.1 ! misho 1: /*
! 2: * Copyright (C) 2005-2010 Martin Willi
! 3: * Copyright (C) 2010 revosec AG
! 4: * Copyright (C) 2005 Jan Hutter
! 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 <stddef.h>
! 19:
! 20: #include "ts_payload.h"
! 21:
! 22: #include <encoding/payloads/encodings.h>
! 23: #include <collections/linked_list.h>
! 24:
! 25: typedef struct private_ts_payload_t private_ts_payload_t;
! 26:
! 27: /**
! 28: * Private data of an ts_payload_t object.
! 29: */
! 30: struct private_ts_payload_t {
! 31:
! 32: /**
! 33: * Public ts_payload_t interface.
! 34: */
! 35: ts_payload_t public;
! 36:
! 37: /**
! 38: * TRUE if this TS payload is of type TSi, FALSE for TSr.
! 39: */
! 40: bool is_initiator;
! 41:
! 42: /**
! 43: * Next payload type.
! 44: */
! 45: uint8_t next_payload;
! 46:
! 47: /**
! 48: * Critical flag.
! 49: */
! 50: bool critical;
! 51:
! 52: /**
! 53: * reserved bits
! 54: */
! 55: bool reserved_bit[7];
! 56:
! 57: /**
! 58: * reserved bytes
! 59: */
! 60: bool reserved_byte[3];
! 61:
! 62: /**
! 63: * Length of this payload.
! 64: */
! 65: uint16_t payload_length;
! 66:
! 67: /**
! 68: * Number of traffic selectors
! 69: */
! 70: uint8_t ts_num;
! 71:
! 72: /**
! 73: * Contains the traffic selectors of type traffic_selector_substructure_t.
! 74: */
! 75: linked_list_t *substrs;
! 76: };
! 77:
! 78: /**
! 79: * Encoding rules to parse or generate a TS payload
! 80: *
! 81: * The defined offsets are the positions in a object of type
! 82: * private_ts_payload_t.
! 83: */
! 84: static encoding_rule_t encodings[] = {
! 85: /* 1 Byte next payload type, stored in the field next_payload */
! 86: { U_INT_8, offsetof(private_ts_payload_t, next_payload) },
! 87: /* the critical bit */
! 88: { FLAG, offsetof(private_ts_payload_t, critical) },
! 89: /* 7 Bit reserved bits */
! 90: { RESERVED_BIT, offsetof(private_ts_payload_t, reserved_bit[0]) },
! 91: { RESERVED_BIT, offsetof(private_ts_payload_t, reserved_bit[1]) },
! 92: { RESERVED_BIT, offsetof(private_ts_payload_t, reserved_bit[2]) },
! 93: { RESERVED_BIT, offsetof(private_ts_payload_t, reserved_bit[3]) },
! 94: { RESERVED_BIT, offsetof(private_ts_payload_t, reserved_bit[4]) },
! 95: { RESERVED_BIT, offsetof(private_ts_payload_t, reserved_bit[5]) },
! 96: { RESERVED_BIT, offsetof(private_ts_payload_t, reserved_bit[6]) },
! 97: /* Length of the whole payload*/
! 98: { PAYLOAD_LENGTH, offsetof(private_ts_payload_t, payload_length) },
! 99: /* 1 Byte TS type*/
! 100: { U_INT_8, offsetof(private_ts_payload_t, ts_num) },
! 101: /* 3 reserved bytes */
! 102: { RESERVED_BYTE, offsetof(private_ts_payload_t, reserved_byte[0])},
! 103: { RESERVED_BYTE, offsetof(private_ts_payload_t, reserved_byte[1])},
! 104: { RESERVED_BYTE, offsetof(private_ts_payload_t, reserved_byte[2])},
! 105: /* wrapped list of traffic selectors substructures */
! 106: { PAYLOAD_LIST + PLV2_TRAFFIC_SELECTOR_SUBSTRUCTURE,
! 107: offsetof(private_ts_payload_t, substrs) },
! 108: };
! 109:
! 110: /*
! 111: 1 2 3
! 112: 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
! 113: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! 114: ! Next Payload !C! RESERVED ! Payload Length !
! 115: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! 116: ! Number of TSs ! RESERVED !
! 117: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! 118: ! !
! 119: ~ <Traffic Selectors> ~
! 120: ! !
! 121: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! 122: */
! 123:
! 124: METHOD(payload_t, verify, status_t,
! 125: private_ts_payload_t *this)
! 126: {
! 127: enumerator_t *enumerator;
! 128: payload_t *substr;
! 129: status_t status = SUCCESS;
! 130:
! 131: if (this->ts_num != this->substrs->get_count(this->substrs))
! 132: {
! 133: return FAILED;
! 134: }
! 135: enumerator = this->substrs->create_enumerator(this->substrs);
! 136: while (enumerator->enumerate(enumerator, &substr))
! 137: {
! 138: status = substr->verify(substr);
! 139: if (status != SUCCESS)
! 140: {
! 141: break;
! 142: }
! 143: }
! 144: enumerator->destroy(enumerator);
! 145:
! 146: return status;
! 147: }
! 148:
! 149: METHOD(payload_t, get_encoding_rules, int,
! 150: private_ts_payload_t *this, encoding_rule_t **rules)
! 151: {
! 152: *rules = encodings;
! 153: return countof(encodings);
! 154: }
! 155:
! 156: METHOD(payload_t, get_header_length, int,
! 157: private_ts_payload_t *this)
! 158: {
! 159: return 8;
! 160: }
! 161:
! 162: METHOD(payload_t, get_type, payload_type_t,
! 163: private_ts_payload_t *this)
! 164: {
! 165: if (this->is_initiator)
! 166: {
! 167: return PLV2_TS_INITIATOR;
! 168: }
! 169: return PLV2_TS_RESPONDER;
! 170: }
! 171:
! 172: METHOD(payload_t, get_next_type, payload_type_t,
! 173: private_ts_payload_t *this)
! 174: {
! 175: return this->next_payload;
! 176: }
! 177:
! 178: METHOD(payload_t, set_next_type, void,
! 179: private_ts_payload_t *this,payload_type_t type)
! 180: {
! 181: this->next_payload = type;
! 182: }
! 183:
! 184: /**
! 185: * recompute the length of the payload.
! 186: */
! 187: static void compute_length(private_ts_payload_t *this)
! 188: {
! 189: enumerator_t *enumerator;
! 190: payload_t *subst;
! 191:
! 192: this->payload_length = get_header_length(this);
! 193: this->ts_num = 0;
! 194: enumerator = this->substrs->create_enumerator(this->substrs);
! 195: while (enumerator->enumerate(enumerator, &subst))
! 196: {
! 197: this->payload_length += subst->get_length(subst);
! 198: this->ts_num++;
! 199: }
! 200: enumerator->destroy(enumerator);
! 201: }
! 202:
! 203: METHOD(payload_t, get_length, size_t,
! 204: private_ts_payload_t *this)
! 205: {
! 206: return this->payload_length;
! 207: }
! 208:
! 209: METHOD(ts_payload_t, get_initiator, bool,
! 210: private_ts_payload_t *this)
! 211: {
! 212: return this->is_initiator;
! 213: }
! 214:
! 215: METHOD(ts_payload_t, set_initiator, void,
! 216: private_ts_payload_t *this,bool is_initiator)
! 217: {
! 218: this->is_initiator = is_initiator;
! 219: }
! 220:
! 221: METHOD(ts_payload_t, get_traffic_selectors, linked_list_t*,
! 222: private_ts_payload_t *this)
! 223: {
! 224: traffic_selector_t *ts;
! 225: enumerator_t *enumerator;
! 226: traffic_selector_substructure_t *subst;
! 227: linked_list_t *list;
! 228:
! 229: list = linked_list_create();
! 230: enumerator = this->substrs->create_enumerator(this->substrs);
! 231: while (enumerator->enumerate(enumerator, &subst))
! 232: {
! 233: ts = subst->get_traffic_selector(subst);
! 234: list->insert_last(list, ts);
! 235: }
! 236: enumerator->destroy(enumerator);
! 237:
! 238: return list;
! 239: }
! 240:
! 241: METHOD2(payload_t, ts_payload_t, destroy, void,
! 242: private_ts_payload_t *this)
! 243: {
! 244: this->substrs->destroy_offset(this->substrs, offsetof(payload_t, destroy));
! 245: free(this);
! 246: }
! 247:
! 248: /*
! 249: * Described in header
! 250: */
! 251: ts_payload_t *ts_payload_create(bool is_initiator)
! 252: {
! 253: private_ts_payload_t *this;
! 254:
! 255: INIT(this,
! 256: .public = {
! 257: .payload_interface = {
! 258: .verify = _verify,
! 259: .get_encoding_rules = _get_encoding_rules,
! 260: .get_header_length = _get_header_length,
! 261: .get_length = _get_length,
! 262: .get_next_type = _get_next_type,
! 263: .set_next_type = _set_next_type,
! 264: .get_type = _get_type,
! 265: .destroy = _destroy,
! 266: },
! 267: .get_initiator = _get_initiator,
! 268: .set_initiator = _set_initiator,
! 269: .get_traffic_selectors = _get_traffic_selectors,
! 270: .destroy = _destroy,
! 271: },
! 272: .next_payload = PL_NONE,
! 273: .payload_length = get_header_length(this),
! 274: .is_initiator = is_initiator,
! 275: .substrs = linked_list_create(),
! 276: );
! 277: return &this->public;
! 278: }
! 279:
! 280: /*
! 281: * Described in header
! 282: */
! 283: ts_payload_t *ts_payload_create_from_traffic_selectors(bool is_initiator,
! 284: linked_list_t *traffic_selectors)
! 285: {
! 286: enumerator_t *enumerator;
! 287: traffic_selector_t *ts;
! 288: traffic_selector_substructure_t *subst;
! 289: private_ts_payload_t *this;
! 290:
! 291: this = (private_ts_payload_t*)ts_payload_create(is_initiator);
! 292:
! 293: enumerator = traffic_selectors->create_enumerator(traffic_selectors);
! 294: while (enumerator->enumerate(enumerator, &ts))
! 295: {
! 296: subst = traffic_selector_substructure_create_from_traffic_selector(ts);
! 297: this->substrs->insert_last(this->substrs, subst);
! 298: }
! 299: enumerator->destroy(enumerator);
! 300: compute_length(this);
! 301:
! 302: return &this->public;
! 303: }
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