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Code

Automatic disabling of segmentation offload

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This commit is contained in:
Michal Zima 2013-06-15 16:35:18 +02:00
parent 252467f956
commit 8b58e0f274
1 changed files with 15 additions and 1 deletions
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16
src/wrapper.c
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@ -17,7 +17,9 @@
*/ */
#include <arpa/inet.h> /* inet_pton */ #include <arpa/inet.h> /* inet_pton */
#include <linux/ethtool.h> /* struct ethtool_value */
#include <linux/if_ether.h> /* ETH_P_ALL */ #include <linux/if_ether.h> /* ETH_P_ALL */
#include <linux/sockios.h> /* SIOCETHTOOL */
#include <net/ethernet.h> /* ETHERTYPE_* */ #include <net/ethernet.h> /* ETHERTYPE_* */
#include <net/if.h> /* struct ifreq */ #include <net/if.h> /* struct ifreq */
#include <netinet/in.h> /* htons */ #include <netinet/in.h> /* htons */
@ -38,7 +40,7 @@
#include "wrapper.h" #include "wrapper.h"
/* +++ CONFIGURATION +++ */ /* +++ CONFIGURATION +++ */
#define INTERFACE "eth0" /* be sure to turn off generic-segmentation-offload! */ #define INTERFACE "eth0"
#define PREFIX "64:ff9b::" #define PREFIX "64:ff9b::"
#define IPV4_ADDR "192.168.0.111" #define IPV4_ADDR "192.168.0.111"
#define HOST_IPV6_ADDR "fd77::1:0:1" #define HOST_IPV6_ADDR "fd77::1:0:1"
@ -59,6 +61,7 @@ int process(char *packet);
int main(int argc, char **argv) int main(int argc, char **argv)
{ {
struct packet_mreq pmr; struct packet_mreq pmr;
struct ethtool_value ethtool;
int sniff_sock; int sniff_sock;
int length; int length;
@ -88,7 +91,18 @@ int main(int argc, char **argv)
memcpy(&mac, &interface.ifr_hwaddr.sa_data, memcpy(&mac, &interface.ifr_hwaddr.sa_data,
sizeof(struct s_mac_addr)); sizeof(struct s_mac_addr));
/* disable generic segmentation offload */
ethtool.cmd = ETHTOOL_SGSO;
ethtool.data = 0;
interface.ifr_data = (caddr_t) &ethtool;
if (ioctl(sniff_sock, SIOCETHTOOL, &interface) == -1) {
log_error("Unable to disable generic segmentation "
"offload on the interface");
return 1;
}
/* reinitialize the interface */ /* reinitialize the interface */
interface.ifr_data = NULL;
if (ioctl(sniff_sock, SIOCGIFINDEX, &interface) == -1) { if (ioctl(sniff_sock, SIOCGIFINDEX, &interface) == -1) {
log_error("Unable to reinitialize the interface"); log_error("Unable to reinitialize the interface");
return 1; return 1;