Commit d3d4f9f5 authored by Dr. Stephen Henson's avatar Dr. Stephen Henson
Browse files

PR: 1929 

Submitted by: Robin Seggelmann <seggelmann@fh-muenster.de>
Approved by: steve@openssl.org

DTLS MTU bug.
parent eb38b26d

crypto/bio/bss_dgram.c

+10 −4
Original line number Diff line number Diff line
@@ -70,7 +70,9 @@ 
#include <sys/timeb.h>

#endif



#ifdef OPENSSL_SYS_LINUX

#define IP_MTU      14 /* linux is lame */

#endif



#ifdef WATT32

#define sock_write SockWrite  /* Watt-32 uses same names */
@@ -401,22 +403,26 @@ static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr) 
		break;

#endif

	case BIO_CTRL_DGRAM_QUERY_MTU:

#ifdef IP_MTU

        sockopt_len = sizeof(sockopt_val);

		if ((ret = getsockopt(b->num, IPPROTO_IP, IP_MTU, (void *)&sockopt_val,

			&sockopt_len)) < 0 || sockopt_val < 0)

			{ ret = 0; }

		else

			{

			data->mtu = sockopt_val;

			data->mtu = sockopt_val - 20 - 8; /* Subtract IP and UDP header */

			ret = data->mtu;

			}

#else

		ret = 0;

#endif

		break;

	case BIO_CTRL_DGRAM_GET_MTU:

		return data->mtu;

		break;

	case BIO_CTRL_DGRAM_SET_MTU:

		data->mtu = num;

		ret = num;

		data->mtu = num - 20 - 8; /* Subtract IP and UDP header */

		ret = data->mtu;

		break;

	case BIO_CTRL_DGRAM_SET_CONNECTED:

		to = (struct sockaddr *)ptr;