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Remove instances in libssl of the constant 28 (for size of IPv4 header + UDP)

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and instead use the value provided by the underlying BIO. Also provide some
new DTLS_CTRLs so that the library user can set the mtu without needing to
know this constant. These new DTLS_CTRLs provide the capability to set the
link level mtu to be used (i.e. including this IP/UDP overhead). The previous
DTLS_CTRLs required the library user to subtract this overhead first.

Reviewed-by: Tim Hudson <tjh@openssl.org>
This commit is contained in:
Matt Caswell
2014-12-01 23:58:05 +00:00
parent 0d3ae34df5
commit 59669b6abf
6 changed files with 74 additions and 30 deletions
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12
ssl/ssl_lib.c
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@@ -1129,18 +1129,6 @@ long SSL_ctrl(SSL *s,int cmd,long larg,void *parg)
l=s->max_cert_list;
s->max_cert_list=larg;
return(l);
case SSL_CTRL_SET_MTU:
#ifndef OPENSSL_NO_DTLS1
if (larg < (long)dtls1_min_mtu())
return 0;
#endif
if (SSL_IS_DTLS(s))
{
s->d1->mtu = larg;
return larg;
}
return 0;
case SSL_CTRL_SET_MAX_SEND_FRAGMENT:
if (larg < 512 || larg > SSL3_RT_MAX_PLAIN_LENGTH)
return 0;