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/* BGP Notification state handling
* Copyright (C) 1996, 97, 98 Kunihiro Ishiguro
*
* Recast for pthreaded bgpd: Copyright (C) Chris Hall (GMCH), Highwayman
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2, or (at your
* option) any later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Zebra; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <string.h>
#include "lib/zassert.h"
#include "lib/memory.h"
#include "bgpd/bgp_notification.h"
/*==============================================================================
* A bgp_notify structure encapsulates the contents of a BGP NOTIFICATION
* message.
*
*
*/
/*------------------------------------------------------------------------------
* Calculate size for bgp_notify of given length
*
* Rounds up to multiple of 32, such that is always at least 16 bytes available.
*/
static inline bgp_size_t
bgp_notify_size(bgp_size_t length)
{
return sizeof(struct bgp_notify) + (((length + 32 + 16 - 1) / 32) * 32) ;
} ;
/*==============================================================================
* Create/Destroy bgp_notify
*/
/*------------------------------------------------------------------------------
* Allocate and initialise new notification
*
* Can specify an expected amount of data.
*/
extern bgp_notify
bgp_notify_new(bgp_nom_code_t code, bgp_nom_subcode_t subcode,
bgp_size_t expect)
{
bgp_notify notification ;
bgp_size_t size = bgp_notify_size(expect) ;
notification = XCALLOC(MTYPE_BGP_NOTIFY, size) ;
notification->code = code ;
notification->subcode = subcode ;
notification->size = size ;
notification->length = 0 ;
return notification ;
} ;
/*------------------------------------------------------------------------------
* Duplicate existing notification (if any)
*/
extern bgp_notify
bgp_notify_dup(bgp_notify notification)
{
bgp_notify duplicate ;
bgp_size_t size ;
if (notification == NULL)
return NULL ;
size = bgp_notify_size(notification->length) ;
duplicate = XMALLOC(MTYPE_BGP_NOTIFY, size) ;
memcpy((void*)duplicate, (void*)notification, size) ;
duplicate->size = size ;
return duplicate ;
} ;
/*------------------------------------------------------------------------------
* Set notification (if any)
*
* Frees any existing notification at the destination.
*
* NB: copies the source pointer -- so must be clear about responsibility
* for the notification structure.
*/
extern void
bgp_notify_set(bgp_notify* p_dst, bgp_notify src)
{
bgp_notify_free(p_dst) ;
*p_dst = src ;
} ;
/*------------------------------------------------------------------------------
* Set notification (if any) to a *copy* of the source.
*
* Frees any existing notification at the destination.
*/
extern void
bgp_notify_set_dup(bgp_notify* p_dst, bgp_notify src)
{
bgp_notify_set(p_dst, bgp_notify_dup(src)) ;
} ;
/*------------------------------------------------------------------------------
* Set notification (if any) and set source pointer NULL
*
* Frees any existing notification at the destination.
*
* NB: responsibility for the notification structure passes to the destination.
*/
extern void
bgp_notify_set_mov(bgp_notify* p_dst, bgp_notify* p_src)
{
bgp_notify_free(p_dst) ;
*p_dst = *p_src ;
*p_src = NULL ;
} ;
/*------------------------------------------------------------------------------
* Free notification structure
*
* Does nothing if there is no structure.
*/
extern void
bgp_notify_free(bgp_notify* p_notification)
{
if (*p_notification != NULL)
XFREE(MTYPE_BGP_NOTIFY, *p_notification) ; /* sets *p_notification NULL */
} ;
/*==============================================================================
* Append data to given notification
*
* Copes with zero length append.
*
* NB: returns possibly NEW ADDRESS of the notification.
*/
extern bgp_notify
bgp_notify_append_data(bgp_notify notification, const void* data,
bgp_size_t len)
{
bgp_size_t new_length = notification->length + len ;
if ((sizeof(struct bgp_notify) + new_length) > notification->size)
{
bgp_size_t size = bgp_notify_size(new_length) ;
notification = XREALLOC(MTYPE_BGP_NOTIFY, notification, size) ;
memset((char*)notification + notification->size, 0,
size - notification->size) ;
notification->size = size ;
} ;
if (len > 0)
memcpy((char*)(notification->data) + notification->length, data, len) ;
notification->length = new_length ;
return notification ;
} ;
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