4 /* (C) 2008 by Harald Welte <laforge@gnumonks.org>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24 #include "linuxlist.h"
29 struct llist_head list;
31 /* Part of which TRX logical channel we were received / transmitted */
32 /* FIXME: move them into the control buffer */
33 struct gsm_bts_trx *trx;
34 struct gsm_lchan *lchan;
36 /* the Layer1 header (if any) */
38 /* the A-bis layer 2 header: OML, RSL(RLL), NS */
40 /* the layer 3 header. For OML: FOM; RSL: 04.08; GPRS: BSSGP */
42 /* the layer 4 header */
45 /* the 'control buffer', large enough to contain 5 pointers */
54 unsigned char _data[0];
57 extern struct msgb *msgb_alloc(uint16_t size, const char *name);
58 extern void msgb_free(struct msgb *m);
59 extern void msgb_enqueue(struct llist_head *queue, struct msgb *msg);
60 extern struct msgb *msgb_dequeue(struct llist_head *queue);
61 extern void msgb_reset(struct msgb *m);
64 #include <osmocore/panic.h>
65 #include <osmocore/gsm_utils.h>
66 #define MSGB_ABORT(msg, fmt, args ...) do { \
67 generate_backtrace(); \
68 osmo_panic("msgb(%p): " fmt, ## args); \
71 #define MSGB_ABORT(msg, fmt, args ...)
74 #define msgb_l1(m) ((void *)(m->l1h))
75 #define msgb_l2(m) ((void *)(m->l2h))
76 #define msgb_l3(m) ((void *)(m->l3h))
77 #define msgb_sms(m) ((void *)(m->l4h))
79 static inline unsigned int msgb_l1len(const struct msgb *msgb)
81 return msgb->tail - (uint8_t *)msgb_l1(msgb);
84 static inline unsigned int msgb_l2len(const struct msgb *msgb)
86 return msgb->tail - (uint8_t *)msgb_l2(msgb);
89 static inline unsigned int msgb_l3len(const struct msgb *msgb)
91 return msgb->tail - (uint8_t *)msgb_l3(msgb);
94 static inline unsigned int msgb_headlen(const struct msgb *msgb)
96 return msgb->len - msgb->data_len;
99 static inline int msgb_tailroom(const struct msgb *msgb)
101 return (msgb->head + msgb->data_len) - msgb->tail;
104 static inline int msgb_headroom(const struct msgb *msgb)
106 return (msgb->data - msgb->head);
109 static inline unsigned char *msgb_put(struct msgb *msgb, unsigned int len)
111 unsigned char *tmp = msgb->tail;
112 if (msgb_tailroom(msgb) < (int) len)
113 MSGB_ABORT(msgb, "Not enough tailroom msgb_push (%u < %u)\n",
114 msgb_tailroom(msgb), len);
119 static inline void msgb_put_u8(struct msgb *msgb, uint8_t word)
121 uint8_t *space = msgb_put(msgb, 1);
122 space[0] = word & 0xFF;
124 static inline void msgb_put_u16(struct msgb *msgb, uint16_t word)
126 uint8_t *space = msgb_put(msgb, 2);
127 space[0] = word >> 8 & 0xFF;
128 space[1] = word & 0xFF;
130 static inline void msgb_put_u32(struct msgb *msgb, uint32_t word)
132 uint8_t *space = msgb_put(msgb, 4);
133 space[0] = word >> 24 & 0xFF;
134 space[1] = word >> 16 & 0xFF;
135 space[2] = word >> 8 & 0xFF;
136 space[3] = word & 0xFF;
138 static inline unsigned char *msgb_get(struct msgb *msgb, unsigned int len)
140 unsigned char *tmp = msgb->data;
145 static inline uint8_t msgb_get_u8(struct msgb *msgb)
147 uint8_t *space = msgb_get(msgb, 1);
150 static inline uint16_t msgb_get_u16(struct msgb *msgb)
152 uint8_t *space = msgb_get(msgb, 2);
153 return space[0] << 8 | space[1];
155 static inline uint32_t msgb_get_u32(struct msgb *msgb)
157 uint8_t *space = msgb_get(msgb, 4);
158 return space[0] << 24 | space[1] << 16 | space[2] << 8 | space[3];
160 static inline unsigned char *msgb_push(struct msgb *msgb, unsigned int len)
162 if (msgb_headroom(msgb) < (int) len)
163 MSGB_ABORT(msgb, "Not enough headroom msgb_push (%u < %u)\n",
164 msgb_headroom(msgb), len);
169 static inline unsigned char *msgb_pull(struct msgb *msgb, unsigned int len)
172 return msgb->data += len;
175 /* increase the headroom of an empty msgb, reducing the tailroom */
176 static inline void msgb_reserve(struct msgb *msg, int len)
182 static inline struct msgb *msgb_alloc_headroom(int size, int headroom,
185 struct msgb *msg = msgb_alloc(size, name);
187 msgb_reserve(msg, headroom);
191 /* non inline functions to ease binding */
192 uint8_t *msgb_data(const struct msgb *msg);
193 uint16_t msgb_length(const struct msgb *msg);