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 <osmocom/core/linuxlist.h>
25 #include <osmocom/core/utils.h>
30 struct llist_head list;
32 /* Part of which TRX logical channel we were received / transmitted */
33 /* FIXME: move them into the control buffer */
34 struct gsm_bts_trx *trx;
35 struct gsm_lchan *lchan;
37 /* the Layer1 header (if any) */
39 /* the A-bis layer 2 header: OML, RSL(RLL), NS */
41 /* the layer 3 header. For OML: FOM; RSL: 04.08; GPRS: BSSGP */
43 /* the layer 4 header */
46 /* the 'control buffer', large enough to contain 5 pointers */
55 unsigned char _data[0];
58 extern struct msgb *msgb_alloc(uint16_t size, const char *name);
59 extern void msgb_free(struct msgb *m);
60 extern void msgb_enqueue(struct llist_head *queue, struct msgb *msg);
61 extern struct msgb *msgb_dequeue(struct llist_head *queue);
62 extern void msgb_reset(struct msgb *m);
65 #include <osmocom/core/panic.h>
66 #define MSGB_ABORT(msg, fmt, args ...) do { \
67 osmo_panic("msgb(%p): " fmt, msg, ## args); \
70 #define MSGB_ABORT(msg, fmt, args ...)
73 #define msgb_l1(m) ((void *)(m->l1h))
74 #define msgb_l2(m) ((void *)(m->l2h))
75 #define msgb_l3(m) ((void *)(m->l3h))
76 #define msgb_sms(m) ((void *)(m->l4h))
78 static inline unsigned int msgb_l1len(const struct msgb *msgb)
80 return msgb->tail - (uint8_t *)msgb_l1(msgb);
83 static inline unsigned int msgb_l2len(const struct msgb *msgb)
85 return msgb->tail - (uint8_t *)msgb_l2(msgb);
88 static inline unsigned int msgb_l3len(const struct msgb *msgb)
90 return msgb->tail - (uint8_t *)msgb_l3(msgb);
93 static inline unsigned int msgb_headlen(const struct msgb *msgb)
95 return msgb->len - msgb->data_len;
98 static inline int msgb_tailroom(const struct msgb *msgb)
100 return (msgb->head + msgb->data_len) - msgb->tail;
103 static inline int msgb_headroom(const struct msgb *msgb)
105 return (msgb->data - msgb->head);
108 static inline unsigned char *msgb_put(struct msgb *msgb, unsigned int len)
110 unsigned char *tmp = msgb->tail;
111 if (msgb_tailroom(msgb) < (int) len)
112 MSGB_ABORT(msgb, "Not enough tailroom msgb_push (%u < %u)\n",
113 msgb_tailroom(msgb), len);
118 static inline void msgb_put_u8(struct msgb *msgb, uint8_t word)
120 uint8_t *space = msgb_put(msgb, 1);
121 space[0] = word & 0xFF;
123 static inline void msgb_put_u16(struct msgb *msgb, uint16_t word)
125 uint8_t *space = msgb_put(msgb, 2);
126 space[0] = word >> 8 & 0xFF;
127 space[1] = word & 0xFF;
129 static inline void msgb_put_u32(struct msgb *msgb, uint32_t word)
131 uint8_t *space = msgb_put(msgb, 4);
132 space[0] = word >> 24 & 0xFF;
133 space[1] = word >> 16 & 0xFF;
134 space[2] = word >> 8 & 0xFF;
135 space[3] = word & 0xFF;
137 static inline unsigned char *msgb_get(struct msgb *msgb, unsigned int len)
139 unsigned char *tmp = msgb->data;
144 static inline uint8_t msgb_get_u8(struct msgb *msgb)
146 uint8_t *space = msgb_get(msgb, 1);
149 static inline uint16_t msgb_get_u16(struct msgb *msgb)
151 uint8_t *space = msgb_get(msgb, 2);
152 return space[0] << 8 | space[1];
154 static inline uint32_t msgb_get_u32(struct msgb *msgb)
156 uint8_t *space = msgb_get(msgb, 4);
157 return space[0] << 24 | space[1] << 16 | space[2] << 8 | space[3];
159 static inline unsigned char *msgb_push(struct msgb *msgb, unsigned int len)
161 if (msgb_headroom(msgb) < (int) len)
162 MSGB_ABORT(msgb, "Not enough headroom msgb_push (%u < %u)\n",
163 msgb_headroom(msgb), len);
168 static inline unsigned char *msgb_pull(struct msgb *msgb, unsigned int len)
171 return msgb->data += len;
174 /* increase the headroom of an empty msgb, reducing the tailroom */
175 static inline void msgb_reserve(struct msgb *msg, int len)
181 static inline struct msgb *msgb_alloc_headroom(int size, int headroom,
184 osmo_static_assert(size > headroom, headroom_bigger);
186 struct msgb *msg = msgb_alloc(size, name);
188 msgb_reserve(msg, headroom);
192 /* non inline functions to ease binding */
193 uint8_t *msgb_data(const struct msgb *msg);
194 uint16_t msgb_length(const struct msgb *msg);
196 /* set the talloc context for msgb_alloc[_headroom] */
197 void msgb_set_talloc_ctx(void *ctx);