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Improvements for PMTU discovery and IPv4 packet fragmentation.

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This commit is contained in:
Guus Sliepen 2003-12-22 11:04:17 +00:00
parent 6d41b429a2
commit 35399784b6
7 changed files with 111 additions and 38 deletions
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21
src/net_packet.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_packet.c,v 1.1.2.46 2003/12/20 21:09:33 guus Exp $
$Id: net_packet.c,v 1.1.2.47 2003/12/22 11:04:16 guus Exp $
*/
#include "system.h"
@ -47,6 +47,10 @@
#include "utils.h"
#include "xalloc.h"
#ifdef WSAEMSGSIZE
#define EMSGSIZE WSAEMSGSIZE
#endif
int keylifetime = 0;
int keyexpires = 0;
EVP_CIPHER_CTX packet_ctx;
@ -64,20 +68,21 @@ void send_mtu_probe(node_t *n)
cp();
n->mtuprobes++;
n->mtuevent = NULL;
if(n->mtuprobes >= 10 && !n->probedmtu) {
if(n->mtuprobes >= 10 && !n->minmtu) {
ifdebug(TRAFFIC) logger(LOG_INFO, _("No response to MTU probes from %s (%s)"), n->name, n->hostname);
return;
}
for(i = 0; i < 3; i++) {
if(n->mtuprobes >= 30 || n->probedmtu >= n->mtu) {
n->mtu = n->probedmtu;
if(n->mtuprobes >= 30 || n->minmtu >= n->maxmtu) {
n->mtu = n->minmtu;
ifdebug(TRAFFIC) logger(LOG_INFO, _("Fixing MTU of %s (%s) to %d after %d probes"), n->name, n->hostname, n->mtu, n->mtuprobes);
return;
}
len = n->probedmtu + 1 + random() % (n->mtu - n->probedmtu);
len = n->minmtu + 1 + random() % (n->maxmtu - n->minmtu);
if(len < 64)
len = 64;
@ -104,8 +109,8 @@ void mtu_probe_h(node_t *n, vpn_packet_t *packet) {
packet->data[0] = 1;
send_packet(n, packet);
} else {
if(n->probedmtu < packet->len)
n->probedmtu = packet->len;
if(n->minmtu < packet->len)
n->minmtu = packet->len;
}
}
@ -386,6 +391,8 @@ static void send_udppacket(node_t *n, vpn_packet_t *inpkt)
if((sendto(listen_socket[sock].udp, (char *) &inpkt->seqno, inpkt->len, 0, &(n->address.sa), SALEN(n->address.sa))) < 0) {
logger(LOG_ERR, _("Error sending packet to %s (%s): %s"), n->name, n->hostname, strerror(errno));
if(errno == EMSGSIZE) {
if(n->maxmtu >= origlen)
n->maxmtu = origlen - 1;
if(n->mtu >= origlen)
n->mtu = origlen - 1;
}