Add some design documentation on how the record layer works to aid future
maintenance.

Reviewed-by: Richard Levitte <levitte@openssl.org>

Fix some formatting oddities in rec_layer_d1.c.

Reviewed-by: Richard Levitte <levitte@openssl.org>

Fix some strange formatting in record.h. This was probably originally
introduced as part of the reformat work.

Reviewed-by: Richard Levitte <levitte@openssl.org>

Replace the hard coded value 8 (the size of the sequence number) with a
constant defined in a macro.

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

numbers directly

Reviewed-by: Richard Levitte <levitte@openssl.org>

Also push some usage of last_write_sequence out of dtls1_retransmit_message
and into the record layer.

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

alert_fragment_len from s->d1 to s->rlayer.d

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

Create dtls_bitmap.h and dtls_bitmap.c

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

alert_fragment_len from s->s3 into s->rlayer

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

layer

Reviewed-by: Richard Levitte <levitte@openssl.org>

up some access to them. Now that various functions have been moved into the
record layer they no longer need to use the accessor macros.

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

the earlier record layer commits

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

RECORD_LAYER_write_pending.

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

being used for what purpose.

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>

the new files s3_msg.c and s1_msg.c respectively.

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Richard Levitte <levitte@openssl.org>