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-rw-r--r--src/libcharon/encoding/payloads/ts_payload.c334
1 files changed, 334 insertions, 0 deletions
diff --git a/src/libcharon/encoding/payloads/ts_payload.c b/src/libcharon/encoding/payloads/ts_payload.c
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index 000000000..6bf3e4293
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+++ b/src/libcharon/encoding/payloads/ts_payload.c
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+/*
+ * 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 <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * 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 <stddef.h>
+
+#include "ts_payload.h"
+
+#include <encoding/payloads/encodings.h>
+#include <utils/linked_list.h>
+
+typedef struct private_ts_payload_t private_ts_payload_t;
+
+/**
+ * Private data of an ts_payload_t object.
+ *
+ */
+struct private_ts_payload_t {
+ /**
+ * Public ts_payload_t interface.
+ */
+ ts_payload_t public;
+
+ /**
+ * TRUE if this TS payload is of type TSi, FALSE for TSr.
+ */
+ bool is_initiator;
+
+ /**
+ * Next payload type.
+ */
+ u_int8_t next_payload;
+
+ /**
+ * Critical flag.
+ */
+ bool critical;
+
+ /**
+ * Length of this payload.
+ */
+ u_int16_t payload_length;
+
+ /**
+ * Number of traffic selectors
+ */
+ u_int8_t number_of_traffic_selectors;
+
+ /**
+ * Contains the traffic selectors of type traffic_selector_substructure_t.
+ */
+ linked_list_t *traffic_selectors;
+};
+
+/**
+ * Encoding rules to parse or generate a TS payload
+ *
+ * The defined offsets are the positions in a object of type
+ * private_ts_payload_t.
+ *
+ */
+encoding_rule_t ts_payload_encodings[] = {
+ /* 1 Byte next payload type, stored in the field next_payload */
+ { U_INT_8, offsetof(private_ts_payload_t, next_payload) },
+ /* the critical bit */
+ { FLAG, offsetof(private_ts_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_ts_payload_t, payload_length)},
+ /* 1 Byte TS type*/
+ { U_INT_8, offsetof(private_ts_payload_t, number_of_traffic_selectors) },
+ /* 3 reserved bytes */
+ { RESERVED_BYTE, 0 },
+ { RESERVED_BYTE, 0 },
+ { RESERVED_BYTE, 0 },
+ /* some ts data bytes, length is defined in PAYLOAD_LENGTH */
+ { TRAFFIC_SELECTORS, offsetof(private_ts_payload_t, traffic_selectors) }
+};
+
+/*
+ 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 !
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ ! Number of TSs ! RESERVED !
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ ! !
+ ~ <Traffic Selectors> ~
+ ! !
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*/
+
+/**
+ * Implementation of payload_t.verify.
+ */
+static status_t verify(private_ts_payload_t *this)
+{
+ iterator_t *iterator;
+ payload_t *current_traffic_selector;
+ status_t status = SUCCESS;
+
+ if (this->number_of_traffic_selectors != (this->traffic_selectors->get_count(this->traffic_selectors)))
+ {
+ /* must be the same */
+ return FAILED;
+ }
+
+ iterator = this->traffic_selectors->create_iterator(this->traffic_selectors,TRUE);
+ while(iterator->iterate(iterator, (void**)&current_traffic_selector))
+ {
+ status = current_traffic_selector->verify(current_traffic_selector);
+ if (status != SUCCESS)
+ {
+ break;
+ }
+ }
+ iterator->destroy(iterator);
+
+ return status;
+}
+
+/**
+ * Implementation of ts_payload_t.get_encoding_rules.
+ */
+static void get_encoding_rules(private_ts_payload_t *this, encoding_rule_t **rules, size_t *rule_count)
+{
+ *rules = ts_payload_encodings;
+ *rule_count = sizeof(ts_payload_encodings) / sizeof(encoding_rule_t);
+}
+
+/**
+ * Implementation of payload_t.get_type.
+ */
+static payload_type_t get_payload_type(private_ts_payload_t *this)
+{
+ if (this->is_initiator)
+ {
+ return TRAFFIC_SELECTOR_INITIATOR;
+ }
+ else
+ {
+ return TRAFFIC_SELECTOR_RESPONDER;
+ }
+}
+
+/**
+ * Implementation of payload_t.get_next_type.
+ */
+static payload_type_t get_next_type(private_ts_payload_t *this)
+{
+ return (this->next_payload);
+}
+
+/**
+ * Implementation of payload_t.set_next_type.
+ */
+static void set_next_type(private_ts_payload_t *this,payload_type_t type)
+{
+ this->next_payload = type;
+}
+
+/**
+ * recompute the length of the payload.
+ */
+static void compute_length (private_ts_payload_t *this)
+{
+ iterator_t *iterator;
+ size_t ts_count = 0;
+ size_t length = TS_PAYLOAD_HEADER_LENGTH;
+ payload_t *current_traffic_selector;
+
+ iterator = this->traffic_selectors->create_iterator(this->traffic_selectors,TRUE);
+ while (iterator->iterate(iterator, (void**)&current_traffic_selector))
+ {
+ length += current_traffic_selector->get_length(current_traffic_selector);
+ ts_count++;
+ }
+ iterator->destroy(iterator);
+
+ this->number_of_traffic_selectors= ts_count;
+ this->payload_length = length;
+}
+
+/**
+ * Implementation of payload_t.get_length.
+ */
+static size_t get_length(private_ts_payload_t *this)
+{
+ compute_length(this);
+ return this->payload_length;
+}
+
+/**
+ * Implementation of ts_payload_t.get_initiator.
+ */
+static bool get_initiator (private_ts_payload_t *this)
+{
+ return (this->is_initiator);
+}
+
+/**
+ * Implementation of ts_payload_t.set_initiator.
+ */
+static void set_initiator (private_ts_payload_t *this,bool is_initiator)
+{
+ this->is_initiator = is_initiator;
+}
+
+/**
+ * Implementation of ts_payload_t.add_traffic_selector_substructure.
+ */
+static void add_traffic_selector_substructure (private_ts_payload_t *this,traffic_selector_substructure_t *traffic_selector)
+{
+ this->traffic_selectors->insert_last(this->traffic_selectors,traffic_selector);
+ this->number_of_traffic_selectors = this->traffic_selectors->get_count(this->traffic_selectors);
+}
+
+/**
+ * Implementation of ts_payload_t.create_traffic_selector_substructure_iterator.
+ */
+static iterator_t * create_traffic_selector_substructure_iterator (private_ts_payload_t *this, bool forward)
+{
+ return this->traffic_selectors->create_iterator(this->traffic_selectors,forward);
+}
+
+/**
+ * Implementation of ts_payload_t.get_traffic_selectors.
+ */
+static linked_list_t *get_traffic_selectors(private_ts_payload_t *this)
+{
+ traffic_selector_t *ts;
+ iterator_t *iterator;
+ traffic_selector_substructure_t *ts_substructure;
+ linked_list_t *ts_list = linked_list_create();
+
+ iterator = this->traffic_selectors->create_iterator(this->traffic_selectors, TRUE);
+ while (iterator->iterate(iterator, (void**)&ts_substructure))
+ {
+ ts = ts_substructure->get_traffic_selector(ts_substructure);
+ ts_list->insert_last(ts_list, (void*)ts);
+ }
+ iterator->destroy(iterator);
+
+ return ts_list;
+}
+
+/**
+ * Implementation of payload_t.destroy and ts_payload_t.destroy.
+ */
+static void destroy(private_ts_payload_t *this)
+{
+ this->traffic_selectors->destroy_offset(this->traffic_selectors,
+ offsetof(payload_t, destroy));
+ free(this);
+}
+
+/*
+ * Described in header
+ */
+ts_payload_t *ts_payload_create(bool is_initiator)
+{
+ private_ts_payload_t *this = malloc_thing(private_ts_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 (*) (ts_payload_t *)) destroy;
+ this->public.get_initiator = (bool (*) (ts_payload_t *)) get_initiator;
+ this->public.set_initiator = (void (*) (ts_payload_t *,bool)) set_initiator;
+ this->public.add_traffic_selector_substructure = (void (*) (ts_payload_t *,traffic_selector_substructure_t *)) add_traffic_selector_substructure;
+ this->public.create_traffic_selector_substructure_iterator = (iterator_t* (*) (ts_payload_t *,bool)) create_traffic_selector_substructure_iterator;
+ this->public.get_traffic_selectors = (linked_list_t *(*) (ts_payload_t *)) get_traffic_selectors;
+
+ /* private variables */
+ this->critical = FALSE;
+ this->next_payload = NO_PAYLOAD;
+ this->payload_length =TS_PAYLOAD_HEADER_LENGTH;
+ this->is_initiator = is_initiator;
+ this->number_of_traffic_selectors = 0;
+ this->traffic_selectors = linked_list_create();
+
+ return &(this->public);
+}
+
+/*
+ * Described in header
+ */
+ts_payload_t *ts_payload_create_from_traffic_selectors(bool is_initiator, linked_list_t *traffic_selectors)
+{
+ iterator_t *iterator;
+ traffic_selector_t *ts;
+ traffic_selector_substructure_t *ts_substructure;
+ private_ts_payload_t *this;
+
+ this = (private_ts_payload_t*)ts_payload_create(is_initiator);
+
+ iterator = traffic_selectors->create_iterator(traffic_selectors, TRUE);
+ while (iterator->iterate(iterator, (void**)&ts))
+ {
+ ts_substructure = traffic_selector_substructure_create_from_traffic_selector(ts);
+ this->public.add_traffic_selector_substructure(&(this->public), ts_substructure);
+ }
+ iterator->destroy(iterator);
+
+ return &(this->public);
+}
+
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