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Restructure source files

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This commit is contained in:
Matthias Schiffer 2012-09-30 15:59:21 +02:00
parent ae4505db19
commit e03169f859
6 changed files with 288 additions and 152 deletions
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2
ffd/CMakeLists.txt
View file

@ -2,7 +2,9 @@ include_directories(${CMAKE_CURRENT_SOURCE_DIR} ${FFD_BINARY_DIR} ${CMAKE_CURREN
add_executable(ffd add_executable(ffd
ffd.c ffd.c
neigh.c
netif.c netif.c
send.c
tlv.c tlv.c
util.c util.c
) )

169
ffd/ffd.c
View file

@ -25,6 +25,7 @@
#include "ffd.h" #include "ffd.h"
#include "neigh.h"
#include "netif.h" #include "netif.h"
#include "packet.h" #include "packet.h"
#include "tlv.h" #include "tlv.h"
@ -40,24 +41,17 @@
#include <netpacket/packet.h> #include <netpacket/packet.h>
#include <sys/socket.h> #include <sys/socket.h>
#include <sys/uio.h>
#define FFD_PROTO 0xffd const eth_addr_t ffd_addr = {{0x03, 0x00, 0x00, 0x00, 0x0f, 0xfd}};
static const eth_addr_t ffd_addr = {{0x03, 0x00, 0x00, 0x00, 0x0f, 0xfd}};
#define HELLO_INTERVAL 400
#define IHU_INTERVAL (3*HELLO_INTERVAL)
#define PACKET_MAX 1000
static char *mesh = "bat0"; static char *mesh = "bat0";
static int sockfd; int sockfd;
static struct timespec now; struct timespec now;
static ffd_iface_t *iface_list = NULL; ffd_iface_t *iface_list = NULL;
static ffd_neigh_t self; static ffd_neigh_t self;
//static ffd_orig_t own_data; //static ffd_orig_t own_data;
@ -156,62 +150,6 @@ static void update_netif(const char *ifname, unsigned ifindex, void *arg) {
iface->addr = netif_get_eth_addr(ifname); iface->addr = netif_get_eth_addr(ifname);
} }
static inline ffd_neigh_t* get_neigh(const ffd_iface_t *iface, const eth_addr_t *addr) {
ffd_neigh_t *neigh;
for (neigh = iface->neigh_list; neigh; neigh = neigh->next) {
if (are_eth_addrs_equal(addr, &neigh->addr))
return neigh;
}
return neigh;
}
static ffd_neigh_t* get_neigh_create(ffd_iface_t *iface, const eth_addr_t *addr) {
ffd_neigh_t *neigh = get_neigh(iface, addr);
if (!neigh) {
neigh = calloc(1, sizeof(ffd_neigh_t));
neigh->next = iface->neigh_list;
iface->neigh_list = neigh;
neigh->addr = *addr;
neigh->txcost = 0xffff;
}
return neigh;
}
static void free_neighs(ffd_neigh_t *neigh) {
ffd_neigh_t *next;
for (; neigh; neigh = next) {
next = neigh->next;
free(neigh);
}
}
static uint16_t get_neigh_rxcost(const ffd_neigh_t *neigh) {
int timediff = timespec_diff(&now, &neigh->last_hello)/10;
int shift = (timediff - neigh->hello_interval/2)/neigh->hello_interval;
int received = __builtin_popcount(neigh->hello_log << shift);
if (received == 0)
return 0xffff;
else
return (0x1000/received);
}
static uint16_t get_neigh_cost(const ffd_neigh_t *neigh) {
uint16_t txcost = neigh->txcost;
if (txcost < 256)
txcost = 256;
uint32_t cost = (txcost * get_neigh_rxcost(neigh)) >> 8;
if (cost > 0xffff)
return 0xffff;
else
return cost;
}
static void update_netifs() { static void update_netifs() {
ffd_iface_t *iface, **cur; ffd_iface_t *iface, **cur;
@ -227,7 +165,7 @@ static void update_netifs() {
if (iface->type == IF_UNSPEC) { if (iface->type == IF_UNSPEC) {
*cur = iface->next; *cur = iface->next;
free_neighs(iface->neigh_list); ffd_neigh_free_list(iface->neigh_list);
free(iface); free(iface);
} }
else { else {
@ -236,82 +174,6 @@ static void update_netifs() {
} }
} }
static bool send_eth(const eth_addr_t *addr, unsigned ifindex, void *buf, size_t len) {
static const uint8_t zeros[46] = {0};
struct sockaddr_ll sa;
memset(&sa, 0, sizeof(sa));
sa.sll_family = AF_PACKET;
sa.sll_protocol = htons(FFD_PROTO);
sa.sll_ifindex = ifindex;
sa.sll_halen = ETH_ALEN;
memcpy(sa.sll_addr, addr->d, ETH_ALEN);
struct iovec vec[2] = {
{ .iov_base = buf, .iov_len = len },
{ .iov_base = (void*)zeros, .iov_len = sizeof(zeros) - len },
};
struct msghdr msg;
memset(&msg, 0, sizeof(msg));
msg.msg_name = &sa;
msg.msg_namelen = sizeof(sa);
msg.msg_iov = vec;
msg.msg_iovlen = (len < 46) ? 2 : 1;
while (sendmsg(sockfd, &msg, 0) < 0) {
if (errno != EINTR)
return false;
}
return true;
}
static void add_ihus(ffd_packet_t *packet, size_t max_len, const ffd_iface_t *iface) {
const ffd_neigh_t *neigh;
for (neigh = iface->neigh_list; neigh; neigh = neigh->next) {
ffd_tlv_ihu_t *ihu = ffd_tlv_add(packet, PACKET_MAX, TLV_IHU, sizeof(ffd_tlv_ihu_t)+sizeof(eth_addr_t));
if (!ihu)
return;
ihu->ae = ADDR_ENC_ETH;
ihu->reserved = 0;
ihu->rxcost = htons(get_neigh_rxcost(neigh));
ihu->interval = htons(IHU_INTERVAL);
memcpy(ihu->address, &neigh->addr, sizeof(eth_addr_t));
}
}
static void send_hellos() {
ffd_packet_t *packet = alloca(sizeof(ffd_packet_t)+PACKET_MAX);
packet->version_magic = htons(FFD_VERSION_MAGIC);
packet->len = 0;
ffd_tlv_hello_t *hello = ffd_tlv_add(packet, PACKET_MAX, TLV_HELLO, sizeof(ffd_tlv_hello_t));
if (!hello)
return;
hello->reserved = 0;
hello->interval = htons(HELLO_INTERVAL);
uint16_t len = packet->len;
ffd_iface_t *iface;
for (iface = iface_list; iface; iface = iface->next) {
hello->seqno = htons(iface->seqno++);
packet->len = len;
add_ihus(packet, PACKET_MAX, iface);
if (!send_eth(&ffd_addr, iface->ifindex, packet, sizeof(ffd_packet_t)+ntohs(packet->len)))
fprintf(stderr, "send_eth: %m\n");
}
}
static void handle_tlv_hello(const ffd_tlv_hello_t *tlv_hello, size_t len, const eth_addr_t *addr, ffd_iface_t *iface) { static void handle_tlv_hello(const ffd_tlv_hello_t *tlv_hello, size_t len, const eth_addr_t *addr, ffd_iface_t *iface) {
if (len < sizeof(ffd_tlv_hello_t)) { if (len < sizeof(ffd_tlv_hello_t)) {
fprintf(stderr, "warn: received short hello TLV.\n"); fprintf(stderr, "warn: received short hello TLV.\n");
@ -320,7 +182,7 @@ static void handle_tlv_hello(const ffd_tlv_hello_t *tlv_hello, size_t len, const
fprintf(stderr, "debug: received hello with seqno %u.\n", ntohs(tlv_hello->seqno)); fprintf(stderr, "debug: received hello with seqno %u.\n", ntohs(tlv_hello->seqno));
ffd_neigh_t *neigh = get_neigh_create(iface, addr); ffd_neigh_t *neigh = ffd_neigh_get(iface, addr);
uint16_t seqno = ntohs(tlv_hello->seqno); uint16_t seqno = ntohs(tlv_hello->seqno);
@ -352,7 +214,10 @@ static void handle_tlv_hello(const ffd_tlv_hello_t *tlv_hello, size_t len, const
neigh->last_seqno = seqno; neigh->last_seqno = seqno;
neigh->last_hello = now; neigh->last_hello = now;
fprintf(stderr, "debug: accepted hello, log %04x, rxcost is %u, cost is %u now.\n", neigh->hello_log, get_neigh_rxcost(neigh), get_neigh_cost(neigh)); if (neigh->hello_log == 1) /* new or reset neighbour */
ffd_neigh_reset(iface, neigh);
fprintf(stderr, "debug: accepted hello, log %04x, rxcost is %u, cost is %u now.\n", neigh->hello_log, ffd_neigh_get_rxcost(neigh), ffd_neigh_get_cost(neigh));
} }
static void handle_tlv_ihu(const ffd_tlv_ihu_t *tlv_ihu, size_t len, const eth_addr_t *addr, ffd_iface_t *iface) { static void handle_tlv_ihu(const ffd_tlv_ihu_t *tlv_ihu, size_t len, const eth_addr_t *addr, ffd_iface_t *iface) {
@ -374,11 +239,11 @@ static void handle_tlv_ihu(const ffd_tlv_ihu_t *tlv_ihu, size_t len, const eth_a
return; return;
} }
ffd_neigh_t *neigh = get_neigh_create(iface, addr); ffd_neigh_t *neigh = ffd_neigh_get(iface, addr);
neigh->last_ihu = now; neigh->last_ihu = now;
neigh->txcost = ntohs(tlv_ihu->rxcost); neigh->txcost = ntohs(tlv_ihu->rxcost);
fprintf(stderr, "debug: accepted IHU, txcost is %u, cost is %u now.\n", neigh->txcost, get_neigh_cost(neigh)); fprintf(stderr, "debug: accepted IHU, txcost is %u, cost is %u now.\n", neigh->txcost, ffd_neigh_get_cost(neigh));
} }
static void handle_tlv(ffd_tlv_type_t type, const void *data, size_t len, void *arg) { static void handle_tlv(ffd_tlv_type_t type, const void *data, size_t len, void *arg) {
@ -405,11 +270,11 @@ static void handle_tlv(ffd_tlv_type_t type, const void *data, size_t len, void *
} }
static void receive_packet() { static void receive_packet() {
ffd_packet_t *packet = alloca(sizeof(ffd_packet_t)+PACKET_MAX); ffd_packet_t *packet = alloca(sizeof(ffd_packet_t)+FFD_PACKET_MAX);
struct sockaddr_ll from; struct sockaddr_ll from;
socklen_t fromlen = sizeof(from); socklen_t fromlen = sizeof(from);
ssize_t readlen = recvfrom(sockfd, packet, sizeof(ffd_packet_t)+PACKET_MAX, 0, (struct sockaddr*)&from, &fromlen); ssize_t readlen = recvfrom(sockfd, packet, sizeof(ffd_packet_t)+FFD_PACKET_MAX, 0, (struct sockaddr*)&from, &fromlen);
if (readlen < 0) { if (readlen < 0) {
fprintf(stderr, "error: recvfrom: %m\n"); fprintf(stderr, "error: recvfrom: %m\n");
@ -458,9 +323,9 @@ int main() {
int timeout = timespec_diff(&next_hello, &now); int timeout = timespec_diff(&next_hello, &now);
if (timeout <= 0) { if (timeout <= 0) {
send_hellos(); ffd_send_hellos();
add_interval(&next_hello, HELLO_INTERVAL); add_interval(&next_hello, FFD_HELLO_INTERVAL);
continue; continue;
} }

20
ffd/ffd.h
View file

@ -33,6 +33,14 @@
#include <net/if.h> #include <net/if.h>
#define FFD_PACKET_MAX 1000
#define FFD_PROTO 0xffd
#define FFD_HELLO_INTERVAL 400
#define FFD_IHU_INTERVAL (3*FFD_HELLO_INTERVAL)
typedef struct _ffd_announce_t { typedef struct _ffd_announce_t {
struct _ffd_announce_t *next; struct _ffd_announce_t *next;
@ -68,4 +76,16 @@ typedef struct _ffd_iface_t {
ffd_neigh_t *neigh_list; ffd_neigh_t *neigh_list;
} ffd_iface_t; } ffd_iface_t;
extern const eth_addr_t ffd_addr;
extern ffd_iface_t *iface_list;
extern int sockfd;
extern struct timespec now;
void ffd_send_hellos();
void ffd_send_announce_request(ffd_iface_t *iface, ffd_neigh_t *neigh, void *announce);
#endif /* _FFD_FFD_H_ */ #endif /* _FFD_FFD_H_ */

78
ffd/neigh.c Normal file
View file

@ -0,0 +1,78 @@
/*
Copyright (c) 2012, 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 "neigh.h"
ffd_neigh_t* ffd_neigh_get(ffd_iface_t *iface, const eth_addr_t *addr) {
ffd_neigh_t *neigh = ffd_neigh_find(iface, addr);
if (!neigh) {
neigh = calloc(1, sizeof(ffd_neigh_t));
neigh->next = iface->neigh_list;
iface->neigh_list = neigh;
neigh->addr = *addr;
neigh->txcost = 0xffff;
}
return neigh;
}
void ffd_neigh_free_list(ffd_neigh_t *neigh) {
ffd_neigh_t *next;
for (; neigh; neigh = next) {
next = neigh->next;
free(neigh);
}
}
uint16_t ffd_neigh_get_rxcost(const ffd_neigh_t *neigh) {
int timediff = timespec_diff(&now, &neigh->last_hello)/10;
int shift = (timediff - neigh->hello_interval/2)/neigh->hello_interval;
int received = __builtin_popcount(neigh->hello_log << shift);
if (received == 0)
return 0xffff;
else
return (0x1000/received);
}
uint16_t ffd_neigh_get_cost(const ffd_neigh_t *neigh) {
uint16_t txcost = neigh->txcost;
if (txcost < 256)
txcost = 256;
uint32_t cost = (txcost * ffd_neigh_get_rxcost(neigh)) >> 8;
if (cost > 0xffff)
return 0xffff;
else
return cost;
}
void ffd_neigh_reset(ffd_iface_t *iface, ffd_neigh_t *neigh) {
ffd_send_announce_request(iface, neigh, NULL);
}

50
ffd/neigh.h Normal file
View file

@ -0,0 +1,50 @@
/*
Copyright (c) 2012, 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 _FFD_NEIGH_H_
#define _FFD_NEIGH_H_
#include "ffd.h"
static inline ffd_neigh_t* ffd_neigh_find(const ffd_iface_t *iface, const eth_addr_t *addr) {
ffd_neigh_t *neigh;
for (neigh = iface->neigh_list; neigh; neigh = neigh->next) {
if (are_eth_addrs_equal(addr, &neigh->addr))
return neigh;
}
return NULL;
}
ffd_neigh_t* ffd_neigh_get(ffd_iface_t *iface, const eth_addr_t *addr);
void ffd_neigh_free_list(ffd_neigh_t *neigh);
uint16_t ffd_neigh_get_rxcost(const ffd_neigh_t *neigh);
uint16_t ffd_neigh_get_cost(const ffd_neigh_t *neigh);
void ffd_neigh_reset(ffd_iface_t *iface, ffd_neigh_t *neigh);
#endif /* _FFD_NEIGH_H_ */

121
ffd/send.c Normal file
View file

@ -0,0 +1,121 @@
/*
Copyright (c) 2012, 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 "ffd.h"
#include "neigh.h"
#include "packet.h"
#include "tlv.h"
#include "tlv_types.h"
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <netpacket/packet.h>
#include <sys/socket.h>
#include <sys/uio.h>
static bool send_eth(const eth_addr_t *addr, unsigned ifindex, void *buf, size_t len) {
static const uint8_t zeros[46] = {0};
struct sockaddr_ll sa;
memset(&sa, 0, sizeof(sa));
sa.sll_family = AF_PACKET;
sa.sll_protocol = htons(FFD_PROTO);
sa.sll_ifindex = ifindex;
sa.sll_halen = ETH_ALEN;
memcpy(sa.sll_addr, addr->d, ETH_ALEN);
struct iovec vec[2] = {
{ .iov_base = buf, .iov_len = len },
{ .iov_base = (void*)zeros, .iov_len = sizeof(zeros) - len },
};
struct msghdr msg;
memset(&msg, 0, sizeof(msg));
msg.msg_name = &sa;
msg.msg_namelen = sizeof(sa);
msg.msg_iov = vec;
msg.msg_iovlen = (len < 46) ? 2 : 1;
while (sendmsg(sockfd, &msg, 0) < 0) {
if (errno != EINTR)
return false;
}
return true;
}
static void add_ihus(ffd_packet_t *packet, size_t max_len, const ffd_iface_t *iface) {
const ffd_neigh_t *neigh;
for (neigh = iface->neigh_list; neigh; neigh = neigh->next) {
ffd_tlv_ihu_t *ihu = ffd_tlv_add(packet, FFD_PACKET_MAX, TLV_IHU, sizeof(ffd_tlv_ihu_t)+sizeof(eth_addr_t));
if (!ihu)
return;
ihu->ae = ADDR_ENC_ETH;
ihu->reserved = 0;
ihu->rxcost = htons(ffd_neigh_get_rxcost(neigh));
ihu->interval = htons(FFD_IHU_INTERVAL);
memcpy(ihu->address, &neigh->addr, sizeof(eth_addr_t));
}
}
void ffd_send_hellos() {
ffd_packet_t *packet = alloca(sizeof(ffd_packet_t)+FFD_PACKET_MAX);
packet->version_magic = htons(FFD_VERSION_MAGIC);
packet->len = 0;
ffd_tlv_hello_t *hello = ffd_tlv_add(packet, FFD_PACKET_MAX, TLV_HELLO, sizeof(ffd_tlv_hello_t));
if (!hello)
return;
hello->reserved = 0;
hello->interval = htons(FFD_HELLO_INTERVAL);
uint16_t len = packet->len;
ffd_iface_t *iface;
for (iface = iface_list; iface; iface = iface->next) {
hello->seqno = htons(iface->seqno++);
packet->len = len;
add_ihus(packet, FFD_PACKET_MAX, iface);
if (!send_eth(&ffd_addr, iface->ifindex, packet, sizeof(ffd_packet_t)+ntohs(packet->len)))
fprintf(stderr, "send_eth: %m\n");
}
}
void ffd_send_announce_request(ffd_iface_t *iface, ffd_neigh_t *neigh, void *announce) {
}