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Add TLV handling code

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This commit is contained in:
Matthias Schiffer 2013-03-18 20:59:37 +01:00
parent a9713337b6
commit 27389a5a61
6 changed files with 309 additions and 0 deletions
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1
src/CMakeLists.txt
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@ -2,6 +2,7 @@ include_directories(${GMRF_INCLUDE_DIR})
add_library(mmss_proto_babel MODULE
core.c
tlv.c
)
target_link_libraries(mmss_proto_babel ${MMSS_PROTOCOL_LIB})
set_target_properties(mmss_proto_babel PROPERTIES LINK_FLAGS "-Wl,--undefined=mmss_protocol_info")

43
src/packet.h Normal file
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@ -0,0 +1,43 @@
/*
Copyright (c) 2013, Matthias Schiffer <mschiffer@universe-factory.net>
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _GMRF_PROTO_BABEL_PACKET_H_
#define _GMRF_PROTO_BABEL_PACKET_H_
#include "types.h"
#define GP_BABEL_VERSION 0
struct __attribute__((packed)) gp_babel_packet {
uint16_t version;
uint16_t len;
uint8_t tlv[];
};
#endif /* _GMRF_PROTO_BABEL_PACKET_H_ */

76
src/tlv.c Normal file
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@ -0,0 +1,76 @@
/*
Copyright (c) 2013, Matthias Schiffer <mschiffer@universe-factory.net>
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "tlv.h"
#include "packet.h"
#include <string.h>
#include <arpa/inet.h>
bool gp_babel_tlv_parse(const gp_babel_packet_t *packet, gp_babel_tlv_cb cb, void *arg) {
if (packet->version != htons(GP_BABEL_VERSION))
return false;
const uint8_t *data = packet->tlv + 2, *end = packet->tlv + ntohs(packet->len);
while (data <= end) {
if (data[-2] == TLV_PAD1) {
/* Pad1 */
data++;
continue;
}
if (data + data[-1] > end) {
/* warn */
break;
}
if (data[-2] != TLV_PADN)
cb(data[-2], data, data[-1], arg);
data += data[-1] + 2;
}
return true;
}
void* gp_babel_tlv_add(gp_babel_packet_t *packet, size_t max_len, gp_babel_tlv_type_t type, size_t len) {
size_t pktlen = ntohs(packet->len);
if (pktlen+len+2 > max_len)
return NULL;
uint8_t *data = packet->tlv+pktlen+2;
data[-2] = type;
data[-1] = len;
packet->len = htons(pktlen+len+2);
return data;
}

63
src/tlv.h Normal file
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@ -0,0 +1,63 @@
/*
Copyright (c) 2013, Matthias Schiffer <mschiffer@universe-factory.net>
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _GMRF_PROTO_BABEL_TLV_H_
#define _GMRF_PROTO_BABEL_TLV_H_
#include "types.h"
typedef enum gp_babel_tlv_type {
TLV_PAD1 = 0,
TLV_PADN,
TLV_ACK_REQ,
TLV_ACK,
TLV_HELLO,
TLV_IHU,
TLV_NODE_ID,
TLV_RESERVED,
TLV_UPDATE,
TLV_ANNOUNCE_REQ,
TLV_SEQNO_REQ,
} gp_babel_tlv_type_t;
typedef enum gp_babel_addr_enc {
ADDR_ENC_UNSPEC = 0,
ADDR_ENC_IPV4,
ADDR_ENC_IPV6,
ADDR_ENC_IPV6LL,
ADDR_ENC_GMRF,
} gp_babel_addr_enc_t;
typedef void (*gp_babel_tlv_cb)(gp_babel_tlv_type_t type, const void *data, size_t len, void *arg);
bool gp_babel_tlv_parse(const gp_babel_packet_t *packet, gp_babel_tlv_cb cb, void *arg);
void* gp_babel_tlv_add(gp_babel_packet_t *packet, size_t max_len, gp_babel_tlv_type_t type, size_t len);
#endif /* _GMRF_PROTO_BABEL_TLV_H_ */

87
src/tlv_types.h Normal file
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@ -0,0 +1,87 @@
/*
Copyright (c) 2013, Matthias Schiffer <mschiffer@universe-factory.net>
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _GMRF_PROTO_BABEL_TLV_TYPES_H_
#define _GMRF_PROTO_BABEL_TLV_TYPES_H_
#include "tlv.h"
typedef struct __attribute__((packed)) gp_babel_tlv_ack_req {
uint16_t reserved;
uint16_t nonce;
uint16_t interval;
} gp_babel_tlv_ack_req_t;
typedef struct __attribute__((packed)) gp_babel_tlv_ack {
uint16_t nonce;
} gp_babel_tlv_ack_t;
typedef struct __attribute__((packed)) gp_babel_tlv_hello {
uint16_t reserved;
uint16_t seqno;
uint16_t interval;
} gp_babel_tlv_hello_t;
typedef struct __attribute__((packed)) gp_babel_tlv_ihu {
uint8_t ae;
uint8_t reserved;
uint16_t rxcost;
uint16_t interval;
uint8_t address[];
} gp_babel_tlv_ihu_t;
typedef struct __attribute__((packed)) gp_babel_tlv_node_id {
gp_babel_node_id_t id;
} gp_babel_tlv_node_id_t;
typedef struct __attribute__((packed)) gp_babel_tlv_update {
uint8_t flags;
uint8_t reserved;
uint16_t interval;
uint16_t seqno;
uint16_t metric;
uint16_t type;
uint16_t key;
uint8_t data[];
} gp_babel_tlv_update_t;
typedef struct __attribute__((packed)) gp_babel_tlv_announce_req {
uint8_t flags;
uint8_t reserved;
gp_babel_node_id_t node;
uint16_t type;
uint16_t key;
} gp_babel_tlv_announce_req_t;
typedef struct __attribute__((packed)) gp_babel_tlv_seqno_req {
uint16_t seqno;
gp_babel_node_id_t node;
uint16_t type;
uint16_t key;
} gp_babel_tlv_seqno_req_t;
#endif /* _GMRF_PROTO_BABEL_TLV_TYPES_H_ */

39
src/types.h Normal file
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@ -0,0 +1,39 @@
/*
Copyright (c) 2013, Matthias Schiffer <mschiffer@universe-factory.net>
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _GMRF_PROTO_BABEL_TYPES_H_
#define _GMRF_PROTO_BABEL_TYPES_H_
#include <gmrf/gmrf.h>
typedef struct __attribute__((packed)) gp_gabel_node_id {
uint8_t id[8];
} gp_babel_node_id_t;
typedef struct gp_babel_packet gp_babel_packet_t;
#endif /* _GMRF_PROTO_BABEL_TYPES_H_ */