move openbsc/* to repos root

This is the first step in creating this repository from the legacy openbsc.git.

Like all other Osmocom repositories, keep the autoconf and automake files in
the repository root. openbsc.git has been the sole exception, which ends now.

Change-Id: I9c6f2a448d9cb1cc088cf1cf6918b69d7e69b4e7

1 files changed, 79 insertions, 0 deletions

diff --git a/include/openbsc/gprs_sndcp.h b/include/openbsc/gprs_sndcp.h
new file mode 100644
index 000000000..d970240e4
--- /dev/null
+++ b/include/openbsc/gprs_sndcp.h
@@ -0,0 +1,79 @@
+#ifndef _INT_SNDCP_H
+#define _INT_SNDCP_H
+
+#include <stdint.h>
+#include <osmocom/core/linuxlist.h>
+
+/* A fragment queue header, maintaining list of fragments for one N-PDU */
+struct defrag_state {
+	/* PDU number for which the defragmentation state applies */
+	uint16_t npdu;
+	/* highest segment number we have received so far */
+	uint8_t highest_seg;
+	/* bitmask of the segments we already have */
+	uint32_t seg_have;
+	/* do we still expect more segments? */
+	unsigned int no_more;
+	/* total length of all segments together */
+	unsigned int tot_len;
+
+	/* linked list of defrag_queue_entry: one for each fragment  */
+	struct llist_head frag_list;
+
+	struct osmo_timer_list timer;
+
+	/* Holds state to know which compression mode is used
+	 * when the packet is re-assembled */
+	uint8_t pcomp;
+	uint8_t dcomp;
+
+	/* Holds the pointers to the compression entity list
+	 * that is used when the re-assembled packet is decompressed */
+	struct llist_head *proto;
+	struct llist_head *data;
+};
+
+/* See 6.7.1.2 Reassembly */
+enum sndcp_rx_state {
+	SNDCP_RX_S_FIRST,
+	SNDCP_RX_S_SUBSEQ,
+	SNDCP_RX_S_DISCARD,
+};
+
+struct gprs_sndcp_entity {
+	struct llist_head list;
+
+	/* FIXME: move this RA_ID up to the LLME or even higher */
+	struct gprs_ra_id ra_id;
+	/* reference to the LLC Entity below this SNDCP entity */
+	struct gprs_llc_lle *lle;
+	/* The NSAPI we shall use on top of LLC */
+	uint8_t nsapi;
+
+	/* NPDU number for the GTP->SNDCP side */
+	uint16_t tx_npdu_nr;
+	/* SNDCP eeceiver state */
+	enum sndcp_rx_state rx_state;
+	/* The defragmentation queue */
+	struct defrag_state defrag;
+};
+
+extern struct llist_head gprs_sndcp_entities;
+
+/* Set of SNDCP-XID negotiation (See also: TS 144 065,
+ * Section 6.8 XID parameter negotiation) */
+int sndcp_sn_xid_req(struct gprs_llc_lle *lle, uint8_t nsapi);
+
+/* Process SNDCP-XID indication (See also: TS 144 065,
+ * Section 6.8 XID parameter negotiation) */
+int sndcp_sn_xid_ind(struct gprs_llc_xid_field *xid_field_indication,
+		     struct gprs_llc_xid_field *xid_field_response,
+		     struct gprs_llc_lle *lle);
+
+/* Process SNDCP-XID indication
+ * (See also: TS 144 065, Section 6.8 XID parameter negotiation) */
+int sndcp_sn_xid_conf(struct gprs_llc_xid_field *xid_field_conf,
+		      struct gprs_llc_xid_field *xid_field_request,
+		      struct gprs_llc_lle *lle);
+
+#endif	/* INT_SNDCP_H */