Implement write pipeline support in libssl

Use the new pipeline cipher capability to encrypt multiple records being
written out all in one go. Two new SSL/SSL_CTX parameters can be used to
control how this works: max_pipelines and split_send_fragment.

max_pipelines defines the maximum number of pipelines that can ever be used
in one go for a single connection. It must always be less than or equal to
SSL_MAX_PIPELINES (currently defined to be 32). By default only one
pipeline will be used (i.e. normal non-parallel operation).

split_send_fragment defines how data is split up into pipelines. The number
of pipelines used will be determined by the amount of data provided to the
SSL_write call divided by split_send_fragment. For example if
split_send_fragment is set to 2000 and max_pipelines is 4 then:
SSL_write called with 0-2000 bytes == 1 pipeline used
SSL_write called with 2001-4000 bytes == 2 pipelines used
SSL_write called with 4001-6000 bytes == 3 pipelines used
SSL_write_called with 6001+ bytes == 4 pipelines used

split_send_fragment must always be less than or equal to max_send_fragment.
By default it is set to be equal to max_send_fragment. This will mean that
the same number of records will always be created as would have been
created in the non-parallel case, although the data will be apportioned
differently. In the parallel case data will be spread equally between the
pipelines.

Reviewed-by: Tim Hudson <tjh@openssl.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/ssl/s3_msg.c b/ssl/s3_msg.c
index 8b5fd23880..8df1e6677f 100644
--- a/ssl/s3_msg.c
+++ b/ssl/s3_msg.c
@@ -192,10 +192,12 @@ int ssl3_send_alert(SSL *s, int level, int desc)
 int ssl3_dispatch_alert(SSL *s)
 {
     int i, j;
+    unsigned int alertlen;
     void (*cb) (const SSL *ssl, int type, int val) = NULL;
 
     s->s3->alert_dispatch = 0;
-    i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0);
+    alertlen = 2;
+    i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], &alertlen, 1, 0);
     if (i <= 0) {
         s->s3->alert_dispatch = 1;
     } else {