/* * Copyright (C) 2005-2010 Martin Willi * Copyright (C) 2010 revosec AG * Copyright (C) 2005 Jan Hutter * Hochschule fuer Technik Rapperswil * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. See . * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * for more details. */ #include #include "cp_payload.h" #include #include ENUM(config_type_names, CFG_REQUEST, CFG_ACK, "CFG_REQUEST", "CFG_REPLY", "CFG_SET", "CFG_ACK", ); typedef struct private_cp_payload_t private_cp_payload_t; /** * Private data of an cp_payload_t object. */ struct private_cp_payload_t { /** * Public cp_payload_t interface. */ cp_payload_t public; /** * Next payload type. */ u_int8_t next_payload; /** * Critical flag. */ bool critical; /** * Reserved bits */ bool reserved_bit[7]; /** * Reserved bytes */ u_int8_t reserved_byte[3]; /** * Length of this payload. */ u_int16_t payload_length; /** * List of attributes, as configuration_attribute_t */ linked_list_t *attributes; /** * Config Type. */ u_int8_t type; }; /** * Encoding rules to parse or generate a IKEv2-CP Payload * * The defined offsets are the positions in a object of type * private_cp_payload_t. */ encoding_rule_t cp_payload_encodings[] = { /* 1 Byte next payload type, stored in the field next_payload */ { U_INT_8, offsetof(private_cp_payload_t, next_payload) }, /* the critical bit */ { FLAG, offsetof(private_cp_payload_t, critical) }, /* 7 Bit reserved bits */ { RESERVED_BIT, offsetof(private_cp_payload_t, reserved_bit[0]) }, { RESERVED_BIT, offsetof(private_cp_payload_t, reserved_bit[1]) }, { RESERVED_BIT, offsetof(private_cp_payload_t, reserved_bit[2]) }, { RESERVED_BIT, offsetof(private_cp_payload_t, reserved_bit[3]) }, { RESERVED_BIT, offsetof(private_cp_payload_t, reserved_bit[4]) }, { RESERVED_BIT, offsetof(private_cp_payload_t, reserved_bit[5]) }, { RESERVED_BIT, offsetof(private_cp_payload_t, reserved_bit[6]) }, /* Length of the whole CP payload*/ { PAYLOAD_LENGTH, offsetof(private_cp_payload_t, payload_length) }, /* Proposals are stored in a proposal substructure, offset points to a linked_list_t pointer */ { U_INT_8, offsetof(private_cp_payload_t, type) }, /* 3 reserved bytes */ { RESERVED_BYTE, offsetof(private_cp_payload_t, reserved_byte[0])}, { RESERVED_BYTE, offsetof(private_cp_payload_t, reserved_byte[1])}, { RESERVED_BYTE, offsetof(private_cp_payload_t, reserved_byte[2])}, { CONFIGURATION_ATTRIBUTES, offsetof(private_cp_payload_t, attributes) } }; /* 1 2 3 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ! Next Payload !C! RESERVED ! Payload Length ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ! CFG Type ! RESERVED ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ! ! ~ Configuration Attributes ~ ! ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ METHOD(payload_t, verify, status_t, private_cp_payload_t *this) { status_t status = SUCCESS; enumerator_t *enumerator; payload_t *attribute; enumerator = this->attributes->create_enumerator(this->attributes); while (enumerator->enumerate(enumerator, &attribute)) { status = attribute->verify(attribute); if (status != SUCCESS) { break; } } enumerator->destroy(enumerator); return status; } METHOD(payload_t, get_encoding_rules, void, private_cp_payload_t *this, encoding_rule_t **rules, size_t *rule_count) { *rules = cp_payload_encodings; *rule_count = countof(cp_payload_encodings); } METHOD(payload_t, get_type, payload_type_t, private_cp_payload_t *this) { return CONFIGURATION; } METHOD(payload_t, get_next_type, payload_type_t, private_cp_payload_t *this) { return this->next_payload; } METHOD(payload_t, set_next_type, void, private_cp_payload_t *this,payload_type_t type) { this->next_payload = type; } /** * recompute the length of the payload. */ static void compute_length(private_cp_payload_t *this) { enumerator_t *enumerator; payload_t *attribute; this->payload_length = CP_PAYLOAD_HEADER_LENGTH; enumerator = this->attributes->create_enumerator(this->attributes); while (enumerator->enumerate(enumerator, &attribute)) { this->payload_length += attribute->get_length(attribute); } enumerator->destroy(enumerator); } METHOD(payload_t, get_length, size_t, private_cp_payload_t *this) { return this->payload_length; } METHOD(cp_payload_t, create_attribute_enumerator, enumerator_t*, private_cp_payload_t *this) { return this->attributes->create_enumerator(this->attributes); } METHOD(cp_payload_t, add_attribute, void, private_cp_payload_t *this, configuration_attribute_t *attribute) { this->attributes->insert_last(this->attributes, attribute); compute_length(this); } METHOD(cp_payload_t, get_config_type, config_type_t, private_cp_payload_t *this) { return this->type; } METHOD2(payload_t, cp_payload_t, destroy, void, private_cp_payload_t *this) { this->attributes->destroy_offset(this->attributes, offsetof(configuration_attribute_t, destroy)); free(this); } /* * Described in header. */ cp_payload_t *cp_payload_create_type(config_type_t type) { private_cp_payload_t *this; INIT(this, .public = { .payload_interface = { .verify = _verify, .get_encoding_rules = _get_encoding_rules, .get_length = _get_length, .get_next_type = _get_next_type, .set_next_type = _set_next_type, .get_type = _get_type, .destroy = _destroy, }, .create_attribute_enumerator = _create_attribute_enumerator, .add_attribute = _add_attribute, .get_type = _get_config_type, .destroy = _destroy, }, .next_payload = NO_PAYLOAD, .payload_length = CP_PAYLOAD_HEADER_LENGTH, .attributes = linked_list_create(), .type = type, ); return &this->public; } /* * Described in header. */ cp_payload_t *cp_payload_create() { return cp_payload_create_type(CFG_REQUEST); }