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#ifndef _MSGB_H
#define _MSGB_H
/* (C) 2008 by Harald Welte <laforge@gnumonks.org>
* All Rights Reserved
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <stdint.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/utils.h>
#define MSGB_DEBUG
struct msgb {
struct llist_head list;
/* routing information. */
void *dst;
/* Part of which TRX logical channel we were received / transmitted */
/* FIXME: move them into the control buffer */
struct gsm_bts_trx *trx;
struct gsm_lchan *lchan;
/* the Layer1 header (if any) */
unsigned char *l1h;
/* the A-bis layer 2 header: OML, RSL(RLL), NS */
unsigned char *l2h;
/* the layer 3 header. For OML: FOM; RSL: 04.08; GPRS: BSSGP */
unsigned char *l3h;
/* the layer 4 header */
unsigned char *l4h;
/* the 'control buffer', large enough to contain 5 pointers */
unsigned long cb[5];
uint16_t data_len;
uint16_t len;
unsigned char *head;
unsigned char *tail;
unsigned char *data;
unsigned char _data[0];
};
extern struct msgb *msgb_alloc(uint16_t size, const char *name);
extern void msgb_free(struct msgb *m);
extern void msgb_enqueue(struct llist_head *queue, struct msgb *msg);
extern struct msgb *msgb_dequeue(struct llist_head *queue);
extern void msgb_reset(struct msgb *m);
#ifdef MSGB_DEBUG
#include <osmocom/core/panic.h>
#define MSGB_ABORT(msg, fmt, args ...) do { \
osmo_panic("msgb(%p): " fmt, msg, ## args); \
} while(0)
#else
#define MSGB_ABORT(msg, fmt, args ...)
#endif
#define msgb_l1(m) ((void *)(m->l1h))
#define msgb_l2(m) ((void *)(m->l2h))
#define msgb_l3(m) ((void *)(m->l3h))
#define msgb_sms(m) ((void *)(m->l4h))
static inline unsigned int msgb_l1len(const struct msgb *msgb)
{
return msgb->tail - (uint8_t *)msgb_l1(msgb);
}
static inline unsigned int msgb_l2len(const struct msgb *msgb)
{
return msgb->tail - (uint8_t *)msgb_l2(msgb);
}
static inline unsigned int msgb_l3len(const struct msgb *msgb)
{
return msgb->tail - (uint8_t *)msgb_l3(msgb);
}
static inline unsigned int msgb_headlen(const struct msgb *msgb)
{
return msgb->len - msgb->data_len;
}
static inline int msgb_tailroom(const struct msgb *msgb)
{
return (msgb->head + msgb->data_len) - msgb->tail;
}
static inline int msgb_headroom(const struct msgb *msgb)
{
return (msgb->data - msgb->head);
}
static inline unsigned char *msgb_put(struct msgb *msgb, unsigned int len)
{
unsigned char *tmp = msgb->tail;
if (msgb_tailroom(msgb) < (int) len)
MSGB_ABORT(msgb, "Not enough tailroom msgb_push (%u < %u)\n",
msgb_tailroom(msgb), len);
msgb->tail += len;
msgb->len += len;
return tmp;
}
static inline void msgb_put_u8(struct msgb *msgb, uint8_t word)
{
uint8_t *space = msgb_put(msgb, 1);
space[0] = word & 0xFF;
}
static inline void msgb_put_u16(struct msgb *msgb, uint16_t word)
{
uint8_t *space = msgb_put(msgb, 2);
space[0] = word >> 8 & 0xFF;
space[1] = word & 0xFF;
}
static inline void msgb_put_u32(struct msgb *msgb, uint32_t word)
{
uint8_t *space = msgb_put(msgb, 4);
space[0] = word >> 24 & 0xFF;
space[1] = word >> 16 & 0xFF;
space[2] = word >> 8 & 0xFF;
space[3] = word & 0xFF;
}
static inline unsigned char *msgb_get(struct msgb *msgb, unsigned int len)
{
unsigned char *tmp = msgb->data;
msgb->data += len;
msgb->len -= len;
return tmp;
}
static inline uint8_t msgb_get_u8(struct msgb *msgb)
{
uint8_t *space = msgb_get(msgb, 1);
return space[0];
}
static inline uint16_t msgb_get_u16(struct msgb *msgb)
{
uint8_t *space = msgb_get(msgb, 2);
return space[0] << 8 | space[1];
}
static inline uint32_t msgb_get_u32(struct msgb *msgb)
{
uint8_t *space = msgb_get(msgb, 4);
return space[0] << 24 | space[1] << 16 | space[2] << 8 | space[3];
}
static inline unsigned char *msgb_push(struct msgb *msgb, unsigned int len)
{
if (msgb_headroom(msgb) < (int) len)
MSGB_ABORT(msgb, "Not enough headroom msgb_push (%u < %u)\n",
msgb_headroom(msgb), len);
msgb->data -= len;
msgb->len += len;
return msgb->data;
}
static inline unsigned char *msgb_pull(struct msgb *msgb, unsigned int len)
{
msgb->len -= len;
return msgb->data += len;
}
/* increase the headroom of an empty msgb, reducing the tailroom */
static inline void msgb_reserve(struct msgb *msg, int len)
{
msg->data += len;
msg->tail += len;
}
static inline struct msgb *msgb_alloc_headroom(int size, int headroom,
const char *name)
{
osmo_static_assert(size > headroom, headroom_bigger);
struct msgb *msg = msgb_alloc(size, name);
if (msg)
msgb_reserve(msg, headroom);
return msg;
}
/* non inline functions to ease binding */
uint8_t *msgb_data(const struct msgb *msg);
uint16_t msgb_length(const struct msgb *msg);
/* set the talloc context for msgb_alloc[_headroom] */
void msgb_set_talloc_ctx(void *ctx);
#endif /* _MSGB_H */
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