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"
27 struct llist_head list;
29 /* Part of which TRX logical channel we were received / transmitted */
30 struct gsm_bts_trx *trx;
31 struct gsm_lchan *lchan;
33 /* the Layer1 header (if any) */
35 /* the A-bis layer 2 header: OML, RSL(RLL), NS */
37 /* the layer 3 header. For OML: FOM; RSL: 04.08; GPRS: BSSGP */
39 /* the layer 4 header */
48 unsigned char _data[0];
51 extern struct msgb *msgb_alloc(uint16_t size, const char *name);
52 extern void msgb_free(struct msgb *m);
53 extern void msgb_enqueue(struct llist_head *queue, struct msgb *msg);
54 extern struct msgb *msgb_dequeue(struct llist_head *queue);
55 extern void msgb_reset(struct msgb *m);
57 #define msgb_l1(m) ((void *)(m->l1h))
58 #define msgb_l2(m) ((void *)(m->l2h))
59 #define msgb_l3(m) ((void *)(m->l3h))
60 #define msgb_sms(m) ((void *)(m->l4h))
62 static inline unsigned int msgb_l1len(const struct msgb *msgb)
64 return msgb->tail - (uint8_t *)msgb_l1(msgb);
67 static inline unsigned int msgb_l2len(const struct msgb *msgb)
69 return msgb->tail - (uint8_t *)msgb_l2(msgb);
72 static inline unsigned int msgb_l3len(const struct msgb *msgb)
74 return msgb->tail - (uint8_t *)msgb_l3(msgb);
77 static inline unsigned int msgb_headlen(const struct msgb *msgb)
79 return msgb->len - msgb->data_len;
81 static inline unsigned char *msgb_put(struct msgb *msgb, unsigned int len)
83 unsigned char *tmp = msgb->tail;
88 static inline void msgb_put_u8(struct msgb *msgb, uint8_t word)
90 uint8_t *space = msgb_put(msgb, 1);
91 space[0] = word & 0xFF;
93 static inline void msgb_put_u16(struct msgb *msgb, uint16_t word)
95 uint8_t *space = msgb_put(msgb, 2);
96 space[0] = word >> 8 & 0xFF;
97 space[1] = word & 0xFF;
99 static inline void msgb_put_u32(struct msgb *msgb, uint32_t word)
101 uint8_t *space = msgb_put(msgb, 4);
102 space[0] = word >> 24 & 0xFF;
103 space[1] = word >> 16 & 0xFF;
104 space[2] = word >> 8 & 0xFF;
105 space[3] = word & 0xFF;
107 static inline unsigned char *msgb_get(struct msgb *msgb, unsigned int len)
109 unsigned char *tmp = msgb->data;
114 static inline uint8_t msgb_get_u8(struct msgb *msgb)
116 uint8_t *space = msgb_get(msgb, 1);
119 static inline uint16_t msgb_get_u16(struct msgb *msgb)
121 uint8_t *space = msgb_get(msgb, 2);
122 return space[0] << 8 | space[1];
124 static inline uint32_t msgb_get_u32(struct msgb *msgb)
126 uint8_t *space = msgb_get(msgb, 4);
127 return space[0] << 24 | space[1] << 16 | space[2] << 8 | space[3];
129 static inline unsigned char *msgb_push(struct msgb *msgb, unsigned int len)
135 static inline unsigned char *msgb_pull(struct msgb *msgb, unsigned int len)
138 return msgb->data += len;
140 static inline int msgb_tailroom(const struct msgb *msgb)
142 return (msgb->head + msgb->data_len) - msgb->tail;
145 /* increase the headroom of an empty msgb, reducing the tailroom */
146 static inline void msgb_reserve(struct msgb *msg, int len)
152 static inline struct msgb *msgb_alloc_headroom(int size, int headroom,
155 struct msgb *msg = msgb_alloc(size, name);
157 msgb_reserve(msg, headroom);