/* * Copyright (C) 2005-2006 Martin Willi * 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 "delete_payload.h" typedef struct private_delete_payload_t private_delete_payload_t; /** * Private data of an delete_payload_t object. * */ struct private_delete_payload_t { /** * Public delete_payload_t interface. */ delete_payload_t public; /** * Next payload type. */ u_int8_t next_payload; /** * Critical flag. */ bool critical; /** * Length of this payload. */ u_int16_t payload_length; /** * Protocol ID. */ u_int8_t protocol_id; /** * SPI Size. */ u_int8_t spi_size; /** * Number of SPI's. */ u_int16_t spi_count; /** * The contained SPI's. */ chunk_t spis; /** * List containing u_int32_t spis */ linked_list_t *spi_list; }; /** * Encoding rules to parse or generate a DELETE payload * * The defined offsets are the positions in a object of type * private_delete_payload_t. * */ encoding_rule_t delete_payload_encodings[] = { /* 1 Byte next payload type, stored in the field next_payload */ { U_INT_8, offsetof(private_delete_payload_t, next_payload) }, /* the critical bit */ { FLAG, offsetof(private_delete_payload_t, critical) }, /* 7 Bit reserved bits, nowhere stored */ { RESERVED_BIT, 0 }, { RESERVED_BIT, 0 }, { RESERVED_BIT, 0 }, { RESERVED_BIT, 0 }, { RESERVED_BIT, 0 }, { RESERVED_BIT, 0 }, { RESERVED_BIT, 0 }, /* Length of the whole payload*/ { PAYLOAD_LENGTH, offsetof(private_delete_payload_t, payload_length)}, { U_INT_8, offsetof(private_delete_payload_t, protocol_id) }, { U_INT_8, offsetof(private_delete_payload_t, spi_size) }, { U_INT_16, offsetof(private_delete_payload_t, spi_count) }, /* some delete data bytes, length is defined in PAYLOAD_LENGTH */ { SPIS, offsetof(private_delete_payload_t, spis) } }; /* 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 ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ! Protocol ID ! SPI Size ! # of SPIs ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ! ! ~ Security Parameter Index(es) (SPI) ~ ! ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ /** * Implementation of payload_t.verify. */ static status_t verify(private_delete_payload_t *this) { switch (this->protocol_id) { case PROTO_AH: case PROTO_ESP: if (this->spi_size != 4) { return FAILED; } break; case PROTO_IKE: case 0: /* IKE deletion has no spi assigned! */ if (this->spi_size != 0) { return FAILED; } break; default: return FAILED; } if (this->spis.len != (this->spi_count * this->spi_size)) { return FAILED; } return SUCCESS; } /** * Implementation of delete_payload_t.get_encoding_rules. */ static void get_encoding_rules(private_delete_payload_t *this, encoding_rule_t **rules, size_t *rule_count) { *rules = delete_payload_encodings; *rule_count = sizeof(delete_payload_encodings) / sizeof(encoding_rule_t); } /** * Implementation of payload_t.get_type. */ static payload_type_t get_payload_type(private_delete_payload_t *this) { return DELETE; } /** * Implementation of payload_t.get_next_type. */ static payload_type_t get_next_type(private_delete_payload_t *this) { return (this->next_payload); } /** * Implementation of payload_t.set_next_type. */ static void set_next_type(private_delete_payload_t *this,payload_type_t type) { this->next_payload = type; } /** * Implementation of payload_t.get_length. */ static size_t get_length(private_delete_payload_t *this) { return this->payload_length; } /** * Implementation of delete_payload_t.get_protocol_id. */ static protocol_id_t get_protocol_id (private_delete_payload_t *this) { return (this->protocol_id); } /** * Implementation of delete_payload_t.add_spi. */ static void add_spi(private_delete_payload_t *this, u_int32_t spi) { /* only add SPIs if AH|ESP, ignore others */ if (this->protocol_id == PROTO_AH || this->protocol_id == PROTO_ESP) { this->spi_count += 1; this->spis.len += this->spi_size; this->spis.ptr = realloc(this->spis.ptr, this->spis.len); *(u_int32_t*)(this->spis.ptr + (this->spis.len / this->spi_size - 1)) = spi; if (this->spi_list) { /* reset SPI iterator list */ this->spi_list->destroy(this->spi_list); this->spi_list = NULL; } } } /** * Implementation of delete_payload_t.create_spi_iterator. */ static iterator_t* create_spi_iterator(private_delete_payload_t *this) { int i; if (this->spi_list == NULL) { this->spi_list = linked_list_create(); /* only parse SPIs if AH|ESP */ if (this->protocol_id == PROTO_AH || this->protocol_id == PROTO_ESP) { for (i = 0; i < this->spi_count; i++) { this->spi_list->insert_last(this->spi_list, this->spis.ptr + i * this->spi_size); } } } return this->spi_list->create_iterator(this->spi_list, TRUE); } /** * Implementation of payload_t.destroy and delete_payload_t.destroy. */ static void destroy(private_delete_payload_t *this) { if (this->spis.ptr != NULL) { chunk_free(&this->spis); } if (this->spi_list) { this->spi_list->destroy(this->spi_list); } free(this); } /* * Described in header */ delete_payload_t *delete_payload_create(protocol_id_t protocol_id) { private_delete_payload_t *this = malloc_thing(private_delete_payload_t); /* interface functions */ this->public.payload_interface.verify = (status_t (*) (payload_t *))verify; this->public.payload_interface.get_encoding_rules = (void (*) (payload_t *, encoding_rule_t **, size_t *) ) get_encoding_rules; this->public.payload_interface.get_length = (size_t (*) (payload_t *)) get_length; this->public.payload_interface.get_next_type = (payload_type_t (*) (payload_t *)) get_next_type; this->public.payload_interface.set_next_type = (void (*) (payload_t *,payload_type_t)) set_next_type; this->public.payload_interface.get_type = (payload_type_t (*) (payload_t *)) get_payload_type; this->public.payload_interface.destroy = (void (*) (payload_t *))destroy; /* public functions */ this->public.destroy = (void (*) (delete_payload_t *)) destroy; this->public.get_protocol_id = (protocol_id_t (*) (delete_payload_t *)) get_protocol_id; this->public.add_spi = (void (*) (delete_payload_t *,u_int32_t))add_spi; this->public.create_spi_iterator = (iterator_t* (*) (delete_payload_t *)) create_spi_iterator; /* private variables */ this->critical = FALSE; this->next_payload = NO_PAYLOAD; this->payload_length = DELETE_PAYLOAD_HEADER_LENGTH; this->protocol_id = protocol_id; this->spi_size = protocol_id == PROTO_AH || protocol_id == PROTO_ESP ? 4 : 0; this->spi_count = 0; this->spis = chunk_empty; this->spi_list = NULL; return (&this->public); }