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Added ARP configuration for interface

This commit is contained in:
Mark Qvist 2020-06-01 22:54:15 +02:00
parent b438e5fb5a
commit 30207d6691
2 changed files with 48 additions and 1 deletions
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6
Constants.h
View File

@ -8,4 +8,8 @@
#define MTU_MAX 1522
#define MTU_DEFAULT 329
#define TXQUEUELEN 10
#define TXQUEUELEN 10
// ARP timings, in seconds
#define ARP_BASE_REACHABLE_TIME 300
#define ARP_RETRANS_TIME 5

43
TAP.c
View File

@ -80,6 +80,49 @@ int open_tap(void) {
}
}
// Configure ARP characteristics
char path_buf[256];
if (device_type == IF_TAP) {
snprintf(path_buf, sizeof(path_buf), "/proc/sys/net/ipv4/neigh/%s/base_reachable_time_ms", ifr.ifr_name);
int arp_fd = open(path_buf, O_WRONLY);
if (arp_fd < 0) {
perror("Could not open proc entry for ARP parameters");
close(inet);
cleanup();
exit(1);
} else {
if (dprintf(arp_fd, "%d", ARP_BASE_REACHABLE_TIME*1000) <= 0) {
perror("Could not configure interface ARP parameter base_reachable_time_ms");
close(inet);
close(arp_fd);
cleanup();
exit(1);
} else {
close(arp_fd);
}
}
snprintf(path_buf, sizeof(path_buf), "/proc/sys/net/ipv4/neigh/%s/retrans_time_ms", ifr.ifr_name);
arp_fd = open(path_buf, O_WRONLY);
if (arp_fd < 0) {
perror("Could not open proc entry for ARP parameters");
close(inet);
cleanup();
exit(1);
} else {
if (dprintf(arp_fd, "%d", ARP_RETRANS_TIME*1000) <= 0) {
perror("Could not configure interface ARP parameter retrans_time_ms");
close(inet);
close(arp_fd);
cleanup();
exit(1);
} else {
close(arp_fd);
}
}
}
// Bring up if requested
if (!noup) {
if (ioctl(inet, SIOCGIFFLAGS, &ifr) < 0) {
perror("Could not get interface flags from kernel");