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Move packet handling to a separate source file

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This commit is contained in:
Matthias Schiffer 2013-03-19 04:21:03 +01:00
parent 5d068fa244
commit b7ad864ec8
4 changed files with 153 additions and 111 deletions
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1
src/CMakeLists.txt
View file

@ -4,6 +4,7 @@ add_library(mmss_proto_babel MODULE
babel.c
neigh.c
tlv.c
tlv_types.c
)
target_link_libraries(mmss_proto_babel ${MMSS_PROTOCOL_LIB})
set_target_properties(mmss_proto_babel PROPERTIES LINK_FLAGS "-Wl,--undefined=mmss_protocol_info")

115
src/babel.c
View file

@ -133,124 +133,17 @@ void gmrf_protocol_add_iface(gmrf_t *gmrf, gmrf_context_t *ctx, gmrf_iface_t *if
ctx->interfaces = b_iface;
}
typedef struct handle_tlv_arg {
gp_babel_iface_t *iface;
const gmrf_addr_t *source;
gp_babel_node_id_t node_id;
} handle_tlv_arg_t;
static inline gp_babel_neigh_t* get_tlv_neigh(handle_tlv_arg_t *arg) {
return gp_babel_neigh_get(arg->iface, arg->source);
}
static void handle_tlv_hello(gmrf_t *gmrf, gmrf_context_t *ctx, const gp_babel_tlv_hello_t *tlv_hello, size_t len, handle_tlv_arg_t *arg) {
if (len < sizeof(gp_babel_tlv_hello_t)) {
gmrf_logf(gmrf, LOG_WARNING, "received short hello TLV.");
return;
}
gmrf_logf(gmrf, LOG_DEBUG, "received hello with seqno %u.", ntohs(tlv_hello->seqno));
gp_babel_neigh_t *neigh = get_tlv_neigh(arg);
uint16_t seqno = ntohs(tlv_hello->seqno);
if (neigh->last_hello != gmrf_time_unspec) {
int timediff = (gmrf_now(gmrf) - neigh->last_hello)/10;
uint16_t seqexp = neigh->last_seqno + (timediff - neigh->hello_interval/2)/neigh->hello_interval;
/* cast to int16_t to ensure correct handling of seqno wrapping */
if (abs((int16_t)(seqno - seqexp)) > 16) {
gmrf_logf(gmrf, LOG_INFO, "neighbour was reset.");
neigh->hello_log = 0;
neigh->txcost = 0xffff;
}
else {
int16_t seqdiff = seqno - neigh->last_seqno;
if (seqdiff <= 0) {
gmrf_logf(gmrf, LOG_DEBUG, "seqno already seen, ignoring.");
return;
}
neigh->hello_log <<= seqdiff;
}
}
else {
gmrf_logf(gmrf, LOG_DEBUG, "received hello from new neighbour.");
}
neigh->hello_log |= 1;
neigh->hello_interval = ntohs(tlv_hello->interval);
neigh->last_seqno = seqno;
neigh->last_hello = gmrf_now(gmrf);
if (neigh->hello_log == 1) /* new or reset neighbour */
gp_babel_neigh_reset(arg->iface, neigh);
gmrf_logf(gmrf, LOG_DEBUG, "accepted hello, log %04x, rxcost is %u, cost is %u now.", neigh->hello_log, gp_babel_neigh_get_rxcost(gmrf, neigh), gp_babel_neigh_get_cost(gmrf, neigh));
}
static void handle_tlv_ihu(gmrf_t *gmrf, gmrf_context_t *ctx, const gp_babel_tlv_ihu_t *tlv_ihu, size_t len, handle_tlv_arg_t *arg) {
if (len < sizeof(gp_babel_tlv_ihu_t)) {
gmrf_logf(gmrf, LOG_WARNING, "received short IHU TLV.");
return;
}
if (tlv_ihu->ae == ADDR_ENC_GMRF) {
if (len < sizeof(gp_babel_tlv_ihu_t)+sizeof(gmrf_addr_t)) {
gmrf_logf(gmrf, LOG_WARNING, "received short IHU TLV.");
return;
}
gmrf_addr_t iface_addr = gmrf_iface_get_addr(gmrf, arg->iface->gmrf_iface);
if (memcmp(tlv_ihu->address, &iface_addr, sizeof(gmrf_addr_t)) != 0)
return;
}
else if (tlv_ihu->ae != ADDR_ENC_UNSPEC) {
return;
}
gp_babel_neigh_t *neigh = get_tlv_neigh(arg);
neigh->ihu_interval = ntohs(tlv_ihu->interval);
neigh->last_ihu = gmrf_now(gmrf);
neigh->txcost = ntohs(tlv_ihu->rxcost);
gmrf_logf(gmrf, LOG_DEBUG, "accepted IHU, txcost is %u, cost is %u now.", gp_babel_neigh_get_txcost(gmrf, neigh), gp_babel_neigh_get_cost(gmrf, neigh));
}
static void handle_tlv(gmrf_t *gmrf, gmrf_context_t *ctx, gp_babel_tlv_type_t type, const void *data, size_t len, void *arg) {
handle_tlv_arg_t *tlv_arg = arg;
switch (type) {
case TLV_HELLO:
handle_tlv_hello(gmrf, ctx, data, len, tlv_arg);
return;
case TLV_IHU:
handle_tlv_ihu(gmrf, ctx, data, len, tlv_arg);
return;
default:
gmrf_logf(gmrf, LOG_DEBUG, "received unknown TLV %u on %s.", type, gmrf_iface_get_name(gmrf, tlv_arg->iface->gmrf_iface));
return;
}
}
void gmrf_protocol_handle_packet(gmrf_t *gmrf, gmrf_context_t *ctx, gmrf_iface_t *iface, const gmrf_addr_t *source, const void *data, size_t len) {
const gp_babel_packet_t *packet = data;
if (len < sizeof(gp_babel_packet_t) || len < sizeof(gp_babel_packet_t)+ntohs(packet->len)) {
if (len < sizeof(gp_babel_packet_t) || len < gp_babel_packet_size(packet)) {
gmrf_logf(gmrf, LOG_DEBUG, "received short packet.");
return;
}
handle_tlv_arg_t arg = { .iface = gp_babel_get_iface(ctx, iface), .source = source };
if (!arg.iface)
gp_babel_iface_t *b_iface = gp_babel_get_iface(ctx, iface);
if (!b_iface)
return;
if (!gp_babel_tlv_parse(gmrf, ctx, packet, handle_tlv, &arg)) {
gmrf_logf(gmrf, LOG_DEBUG, "received invalid packet.");
}
gp_babel_handle_packet(gmrf, ctx, b_iface, source, packet);
}

3
src/babel.h
View file

@ -85,4 +85,7 @@ static inline gp_babel_iface_t* gp_babel_get_iface(gmrf_context_t *ctx, gmrf_ifa
return NULL;
}
void gp_babel_handle_packet(gmrf_t *gmrf, gmrf_context_t *ctx, gp_babel_iface_t *iface, const gmrf_addr_t *source, const gp_babel_packet_t *packet);
#endif /* _GMRF_PROTO_BABEL_BABEL_H_ */

145
src/tlv_types.c Normal file
View file

@ -0,0 +1,145 @@
/*
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 "babel.h"
#include "neigh.h"
#include "packet.h"
#include "tlv_types.h"
#include <stdlib.h>
typedef struct handle_tlv_arg {
gp_babel_iface_t *iface;
const gmrf_addr_t *source;
gp_babel_node_id_t node_id;
} handle_tlv_arg_t;
static inline gp_babel_neigh_t* get_tlv_neigh(handle_tlv_arg_t *arg) {
return gp_babel_neigh_get(arg->iface, arg->source);
}
static void handle_tlv_hello(gmrf_t *gmrf, gmrf_context_t *ctx, const gp_babel_tlv_hello_t *tlv_hello, size_t len, handle_tlv_arg_t *arg) {
if (len < sizeof(gp_babel_tlv_hello_t)) {
gmrf_logf(gmrf, LOG_WARNING, "received short hello TLV.");
return;
}
gmrf_logf(gmrf, LOG_DEBUG, "received hello with seqno %u.", ntohs(tlv_hello->seqno));
gp_babel_neigh_t *neigh = get_tlv_neigh(arg);
uint16_t seqno = ntohs(tlv_hello->seqno);
if (neigh->last_hello != gmrf_time_unspec) {
int timediff = (gmrf_now(gmrf) - neigh->last_hello)/10;
uint16_t seqexp = neigh->last_seqno + (timediff - neigh->hello_interval/2)/neigh->hello_interval;
/* cast to int16_t to ensure correct handling of seqno wrapping */
if (abs((int16_t)(seqno - seqexp)) > 16) {
gmrf_logf(gmrf, LOG_INFO, "neighbour was reset.");
neigh->hello_log = 0;
neigh->txcost = 0xffff;
}
else {
int16_t seqdiff = seqno - neigh->last_seqno;
if (seqdiff <= 0) {
gmrf_logf(gmrf, LOG_DEBUG, "seqno already seen, ignoring.");
return;
}
neigh->hello_log <<= seqdiff;
}
}
else {
gmrf_logf(gmrf, LOG_DEBUG, "received hello from new neighbour.");
}
neigh->hello_log |= 1;
neigh->hello_interval = ntohs(tlv_hello->interval);
neigh->last_seqno = seqno;
neigh->last_hello = gmrf_now(gmrf);
if (neigh->hello_log == 1) /* new or reset neighbour */
gp_babel_neigh_reset(arg->iface, neigh);
gmrf_logf(gmrf, LOG_DEBUG, "accepted hello, log %04x, rxcost is %u, cost is %u now.", neigh->hello_log, gp_babel_neigh_get_rxcost(gmrf, neigh), gp_babel_neigh_get_cost(gmrf, neigh));
}
static void handle_tlv_ihu(gmrf_t *gmrf, gmrf_context_t *ctx, const gp_babel_tlv_ihu_t *tlv_ihu, size_t len, handle_tlv_arg_t *arg) {
if (len < sizeof(gp_babel_tlv_ihu_t)) {
gmrf_logf(gmrf, LOG_WARNING, "received short IHU TLV.");
return;
}
if (tlv_ihu->ae == ADDR_ENC_GMRF) {
if (len < sizeof(gp_babel_tlv_ihu_t)+sizeof(gmrf_addr_t)) {
gmrf_logf(gmrf, LOG_WARNING, "received short IHU TLV.");
return;
}
gmrf_addr_t iface_addr = gmrf_iface_get_addr(gmrf, arg->iface->gmrf_iface);
if (memcmp(tlv_ihu->address, &iface_addr, sizeof(gmrf_addr_t)) != 0)
return;
}
else if (tlv_ihu->ae != ADDR_ENC_UNSPEC) {
return;
}
gp_babel_neigh_t *neigh = get_tlv_neigh(arg);
neigh->ihu_interval = ntohs(tlv_ihu->interval);
neigh->last_ihu = gmrf_now(gmrf);
neigh->txcost = ntohs(tlv_ihu->rxcost);
gmrf_logf(gmrf, LOG_DEBUG, "accepted IHU, txcost is %u, cost is %u now.", gp_babel_neigh_get_txcost(gmrf, neigh), gp_babel_neigh_get_cost(gmrf, neigh));
}
static void handle_tlv(gmrf_t *gmrf, gmrf_context_t *ctx, gp_babel_tlv_type_t type, const void *data, size_t len, void *arg) {
handle_tlv_arg_t *tlv_arg = arg;
switch (type) {
case TLV_HELLO:
handle_tlv_hello(gmrf, ctx, data, len, tlv_arg);
return;
case TLV_IHU:
handle_tlv_ihu(gmrf, ctx, data, len, tlv_arg);
return;
default:
gmrf_logf(gmrf, LOG_DEBUG, "received unknown TLV %u on %s.", type, gmrf_iface_get_name(gmrf, tlv_arg->iface->gmrf_iface));
return;
}
}
void gp_babel_handle_packet(gmrf_t *gmrf, gmrf_context_t *ctx, gp_babel_iface_t *iface, const gmrf_addr_t *source, const gp_babel_packet_t *packet) {
handle_tlv_arg_t arg = { .iface = iface, .source = source };
if (!gp_babel_tlv_parse(gmrf, ctx, packet, handle_tlv, &arg)) {
gmrf_logf(gmrf, LOG_DEBUG, "received invalid packet.");
}
}