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-rw-r--r--openbsc/include/openbsc/msgb.h111
1 files changed, 111 insertions, 0 deletions
diff --git a/openbsc/include/openbsc/msgb.h b/openbsc/include/openbsc/msgb.h
new file mode 100644
index 00000000..2c31d158
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+++ b/openbsc/include/openbsc/msgb.h
@@ -0,0 +1,111 @@
+#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 <openbsc/linuxlist.h>
+
+struct bts_link;
+
+struct msgb {
+ struct llist_head list;
+
+ /* ptr to the physical E1 link to the BTS(s) */
+ struct gsm_bts_link *bts_link;
+
+ /* Part of which TRX logical channel we were received / transmitted */
+ struct gsm_bts_trx *trx;
+ struct gsm_lchan *lchan;
+
+ unsigned char *l2h;
+ unsigned char *l3h;
+ unsigned char *smsh;
+
+ u_int16_t data_len;
+ u_int16_t len;
+
+ unsigned char *head;
+ unsigned char *tail;
+ unsigned char *data;
+ unsigned char _data[0];
+};
+
+extern struct msgb *msgb_alloc(u_int16_t size);
+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);
+
+#define msgb_l2(m) ((void *)(m->l2h))
+#define msgb_l3(m) ((void *)(m->l3h))
+#define msgb_sms(m) ((void *)(m->smsh))
+
+static inline unsigned int msgb_l2len(const struct msgb *msgb)
+{
+ return msgb->tail - (u_int8_t *)msgb_l2(msgb);
+}
+
+static inline unsigned int msgb_l3len(const struct msgb *msgb)
+{
+ return msgb->tail - (u_int8_t *)msgb_l3(msgb);
+}
+
+static inline unsigned int msgb_headlen(const struct msgb *msgb)
+{
+ return msgb->len - msgb->data_len;
+}
+static inline unsigned char *msgb_put(struct msgb *msgb, unsigned int len)
+{
+ unsigned char *tmp = msgb->tail;
+ msgb->tail += len;
+ msgb->len += len;
+ return tmp;
+}
+static inline unsigned char *msgb_push(struct msgb *msgb, unsigned int 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;
+}
+static inline int msgb_tailroom(const struct msgb *msgb)
+{
+ return (msgb->data + msgb->data_len) - msgb->tail;
+}
+
+/* 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)
+{
+ struct msgb *msg = msgb_alloc(size);
+ if (msg)
+ msgb_reserve(msg, headroom);
+ return msg;
+}
+
+#endif /* _MSGB_H */