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Let tinc figure out the exact MTU of the link.

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This commit is contained in:
Guus Sliepen 2003-12-20 19:47:53 +00:00
parent e8fbef5de6
commit 6b12bea62f
12 changed files with 193 additions and 78 deletions
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83
src/net_socket.c
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@ -17,7 +17,7 @@
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id: net_socket.c,v 1.1.2.35 2003/12/12 19:52:25 guus Exp $
$Id: net_socket.c,v 1.1.2.36 2003/12/20 19:47:52 guus Exp $
*/
#include "system.h"
@ -49,13 +49,10 @@ int listen_sockets;
int setup_listen_socket(const sockaddr_t *sa)
{
int nfd, flags;
int nfd;
char *addrstr;
int option;
char *iface;
#ifdef SO_BINDTODEVICE
struct ifreq ifr;
#endif
cp();
@ -67,13 +64,15 @@ int setup_listen_socket(const sockaddr_t *sa)
}
#ifdef O_NONBLOCK
flags = fcntl(nfd, F_GETFL);
{
int flags = fcntl(nfd, F_GETFL);
if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
closesocket(nfd);
logger(LOG_ERR, _("System call `%s' failed: %s"), "fcntl",
strerror(errno));
return -1;
if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
closesocket(nfd);
logger(LOG_ERR, _("System call `%s' failed: %s"), "fcntl",
strerror(errno));
return -1;
}
}
#endif
@ -94,6 +93,8 @@ int setup_listen_socket(const sockaddr_t *sa)
if(get_config_string
(lookup_config(config_tree, "BindToInterface"), &iface)) {
#if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
@ -129,13 +130,9 @@ int setup_listen_socket(const sockaddr_t *sa)
int setup_vpn_in_socket(const sockaddr_t *sa)
{
int nfd, flags;
int nfd;
char *addrstr;
int option;
#if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
char *iface;
struct ifreq ifr;
#endif
cp();
@ -147,29 +144,51 @@ int setup_vpn_in_socket(const sockaddr_t *sa)
}
#ifdef O_NONBLOCK
flags = fcntl(nfd, F_GETFL);
if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
closesocket(nfd);
logger(LOG_ERR, _("System call `%s' failed: %s"), "fcntl",
strerror(errno));
return -1;
{
int flags = fcntl(nfd, F_GETFL);
if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
closesocket(nfd);
logger(LOG_ERR, _("System call `%s' failed: %s"), "fcntl",
strerror(errno));
return -1;
}
}
#endif
option = 1;
setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
#if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
if(get_config_string
(lookup_config(config_tree, "BindToInterface"), &iface)) {
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
{
bool choice;
if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr))) {
closesocket(nfd);
logger(LOG_ERR, _("Can't bind to interface %s: %s"), iface,
strerror(errno));
return -1;
if(get_config_bool(lookup_config(myself->connection->config_tree, "DontFragment"), &choice) && choice) {
option = IP_PMTUDISC_DO;
if(setsockopt(nfd, SOL_IP, IP_MTU_DISCOVER, &option, sizeof(option))) {
closesocket(nfd);
logger(LOG_ERR, _("Can't set MTU discovery mode: %s"), strerror(errno));
return -1;
}
}
}
#endif
#if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
{
char *iface;
struct ifreq ifr;
if(get_config_string(lookup_config(config_tree, "BindToInterface"), &iface)) {
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr))) {
closesocket(nfd);
logger(LOG_ERR, _("Can't bind to interface %s: %s"), iface,
strerror(errno));
return -1;
}
}
}
#endif