libosmogsm  0.9.6-17.20170220git32ee5af8.an8
Osmocom GSM library
lapd_core.h
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1 #pragma once
2 
3 #include <stdint.h>
4 
5 #include <osmocom/core/timer.h>
6 #include <osmocom/core/msgb.h>
7 #include <osmocom/gsm/prim.h>
8 
27 };
28 
29 /* Uses the same values as RLL, so no conversion for GSM is required. */
30 #define MDL_CAUSE_T200_EXPIRED 0x01
31 #define MDL_CAUSE_REEST_REQ 0x02
32 #define MDL_CAUSE_UNSOL_UA_RESP 0x03
33 #define MDL_CAUSE_UNSOL_DM_RESP 0x04
34 #define MDL_CAUSE_UNSOL_DM_RESP_MF 0x05
35 #define MDL_CAUSE_UNSOL_SPRV_RESP 0x06
36 #define MDL_CAUSE_SEQ_ERR 0x07
37 #define MDL_CAUSE_UFRM_INC_PARAM 0x08
38 #define MDL_CAUSE_SFRM_INC_PARAM 0x09
39 #define MDL_CAUSE_IFRM_INC_MBITS 0x0a
40 #define MDL_CAUSE_IFRM_INC_LEN 0x0b
41 #define MDL_CAUSE_FRM_UNIMPL 0x0c
42 #define MDL_CAUSE_SABM_MF 0x0d
43 #define MDL_CAUSE_SABM_INFO_NOTALL 0x0e
44 #define MDL_CAUSE_FRMR 0x0f
45 
48  uint8_t cause;
49 };
50 
53  uint8_t mode;
54 };
55 
58  struct osmo_prim_hdr oph;
59  union {
60  struct mdl_error_ind_param error_ind;
61  struct dl_rel_req_param rel_req;
62  } u;
63 };
64 
66 enum lapd_mode {
69 };
70 
72 enum lapd_state {
73  LAPD_STATE_NULL = 0,
74  LAPD_STATE_TEI_UNASS,
75  LAPD_STATE_ASS_TEI_WAIT,
76  LAPD_STATE_EST_TEI_WAIT,
77  LAPD_STATE_IDLE,
78  LAPD_STATE_SABM_SENT,
79  LAPD_STATE_DISC_SENT,
80  LAPD_STATE_MF_EST,
81  LAPD_STATE_TIMER_RECOV,
82 };
83 
86  LAPD_FORM_UKN = 0,
87  LAPD_FORM_I,
88  LAPD_FORM_S,
89  LAPD_FORM_U,
90 };
91 
93 struct lapd_msg_ctx {
94  struct lapd_datalink *dl;
95  int n201;
96  /* address */
97  uint8_t cr;
98  uint8_t sapi;
99  uint8_t tei;
100  uint8_t lpd;
101  /* control */
102  uint8_t format;
103  uint8_t p_f; /* poll / final bit */
104  uint8_t n_send;
105  uint8_t n_recv;
106  uint8_t s_u; /* S or repectivly U function bits */
107  /* length */
108  int length;
109  uint8_t more;
110 };
111 
112 struct lapd_cr_ent {
113  uint8_t cmd;
114  uint8_t resp;
115 };
116 
117 struct lapd_history {
118  struct msgb *msg; /* message to be sent / NULL, if histoy is empty */
119  int more; /* if message is fragmented */
120 };
121 
124  int (*send_dlsap)(struct osmo_dlsap_prim *dp,
125  struct lapd_msg_ctx *lctx);
126  int (*send_ph_data_req)(struct lapd_msg_ctx *lctx, struct msgb *msg);
127  int (*update_pending_frames)(struct lapd_msg_ctx *lctx);
128  struct {
130  struct lapd_cr_ent loc2rem;
131  struct lapd_cr_ent rem2loc;
132  } cr;
133  enum lapd_mode mode;
134  int use_sabme;
136  int n200, n200_est_rel;
137  struct lapd_msg_ctx lctx;
138  int maxf;
139  uint8_t k;
140  uint8_t v_range;
141  uint8_t v_send;
142  uint8_t v_ack;
143  uint8_t v_recv;
144  uint32_t state;
146  uint8_t own_busy;
147  uint8_t peer_busy;
148  int t200_sec, t200_usec;
149  int t203_sec, t203_usec;
150  struct osmo_timer_list t200;
151  struct osmo_timer_list t203;
152  uint8_t retrans_ctr;
153  struct llist_head tx_queue;
154  struct llist_head send_queue;
155  struct msgb *send_buffer;
156  int send_out;
158  uint8_t range_hist;
159  struct msgb *rcv_buffer;
160  struct msgb *cont_res;
161 };
162 
163 void lapd_dl_init(struct lapd_datalink *dl, uint8_t k, uint8_t v_range,
164  int maxf);
165 void lapd_dl_exit(struct lapd_datalink *dl);
166 void lapd_dl_reset(struct lapd_datalink *dl);
167 int lapd_set_mode(struct lapd_datalink *dl, enum lapd_mode mode);
168 int lapd_ph_data_ind(struct msgb *msg, struct lapd_msg_ctx *lctx);
169 int lapd_recv_dlsap(struct osmo_dlsap_prim *dp, struct lapd_msg_ctx *lctx);
170 
int lapd_set_mode(struct lapd_datalink *dl, enum lapd_mode mode)
Set the lapdm_mode of a LAPDm entity.
Definition: lapd_core.c:333
lapd_mode
LAPD mode/role.
Definition: lapd_core.h:66
lapd_format
LAPD message format (I / S / U)
Definition: lapd_core.h:85
osmo_dl_prim
LAPD related primitives (L2<->L3 SAP)
Definition: lapd_core.h:18
lapd_state
LAPD state (Figure B.2/Q.921)
Definition: lapd_core.h:72
@ LAPD_MODE_USER
behave like user
Definition: lapd_core.h:67
@ LAPD_MODE_NETWORK
behave like network
Definition: lapd_core.h:68
@ PRIM_DL_REL
DL-RLEEASE.
Definition: lapd_core.h:22
@ PRIM_DL_RES
DL-RESUME.
Definition: lapd_core.h:24
@ PRIM_DL_SUSP
DL-SUSPEND.
Definition: lapd_core.h:23
@ PRIM_DL_EST
DL-ESTABLISH.
Definition: lapd_core.h:21
@ PRIM_DL_DATA
DL-DATA.
Definition: lapd_core.h:20
@ PRIM_DL_UNIT_DATA
DL-UNIT-DATA.
Definition: lapd_core.h:19
@ PRIM_MDL_ERROR
MDL-ERROR.
Definition: lapd_core.h:26
@ PRIM_DL_RECON
DL-RECONNECT.
Definition: lapd_core.h:25
uint8_t length
Length in octets.
Definition: gsm_12_21.h:7
for DL-REL.req
Definition: lapd_core.h:52
uint8_t mode
release mode
Definition: lapd_core.h:53
Definition: lapd_core.h:112
Definition: lapd_core.h:117
LAPD message context.
Definition: lapd_core.h:93
for MDL-ERROR.ind
Definition: lapd_core.h:47
uint8_t cause
generic cause value
Definition: lapd_core.h:48
primitive header for LAPD DL-SAP primitives
Definition: lapd_core.h:57
union osmo_dlsap_prim::@2 u
request-specific data
struct osmo_prim_hdr oph
generic primitive header
Definition: lapd_core.h:58