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PR: 2755

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Submitted by: Robin Seggelmann <seggelmann@fh-muenster.de>

Reduce MTU after failed transmissions.
This commit is contained in:
Dr. Stephen Henson
2012-03-06 13:45:47 +00:00
parent 272993bac4
commit b2a2c6af2a
4 changed files with 29 additions and 2 deletions
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1
crypto/bio/bio.h
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@@ -145,6 +145,7 @@ extern "C" {
/* #endif */
#define BIO_CTRL_DGRAM_QUERY_MTU 40 /* as kernel for current MTU */
#define BIO_CTRL_DGRAM_GET_FALLBACK_MTU 47
#define BIO_CTRL_DGRAM_GET_MTU 41 /* get cached value for MTU */
#define BIO_CTRL_DGRAM_SET_MTU 42 /* set cached value for
* MTU. want to use this

21
crypto/bio/bss_dgram.c
View File

@@ -494,6 +494,27 @@ static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
ret = 0;
#endif
break;
case BIO_CTRL_DGRAM_GET_FALLBACK_MTU:
switch (data->peer.sa.sa_family)
{
case AF_INET:
ret = 576 - 20 - 8;
break;
#if OPENSSL_USE_IPV6
case AF_INET6:
#ifdef IN6_IS_ADDR_V4MAPPED
if (IN6_IS_ADDR_V4MAPPED(&data->peer.sa_in6.sin6_addr))
ret = 576 - 20 - 8;
else
#endif
ret = 1280 - 40 - 8;
break;
#endif
default:
ret = 576 - 20 - 8;
break;
}
break;
case BIO_CTRL_DGRAM_GET_MTU:
return data->mtu;
break;