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-rw-r--r--src/gsm/gsm0808.c176
1 files changed, 60 insertions, 116 deletions
diff --git a/src/gsm/gsm0808.c b/src/gsm/gsm0808.c
index 01221bd8..6c10177b 100644
--- a/src/gsm/gsm0808.c
+++ b/src/gsm/gsm0808.c
@@ -27,69 +27,52 @@
#define BSSMAP_MSG_SIZE 512
#define BSSMAP_MSG_HEADROOM 128
-static void put_data_16(uint8_t *data, const uint16_t val)
-{
- memcpy(data, &val, sizeof(val));
-}
-
struct msgb *gsm0808_create_layer3(struct msgb *msg_l3, uint16_t nc, uint16_t cc, int lac, uint16_t _ci)
{
- uint8_t *data;
- uint8_t *ci;
struct msgb* msg;
- struct gsm48_loc_area_id *lai;
+ struct {
+ uint8_t ident;
+ struct gsm48_loc_area_id lai;
+ uint16_t ci;
+ } __attribute__ ((packed)) lai_ci;
msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM,
"bssmap cmpl l3");
if (!msg)
return NULL;
- /* create the bssmap header */
- msg->l3h = msgb_put(msg, 2);
- msg->l3h[0] = 0x0;
-
/* create layer 3 header */
- data = msgb_put(msg, 1);
- data[0] = BSS_MAP_MSG_COMPLETE_LAYER_3;
+ msgb_v_put(msg, BSS_MAP_MSG_COMPLETE_LAYER_3);
/* create the cell header */
- data = msgb_put(msg, 3);
- data[0] = GSM0808_IE_CELL_IDENTIFIER;
- data[1] = 1 + sizeof(*lai) + 2;
- data[2] = CELL_IDENT_WHOLE_GLOBAL;
-
- lai = (struct gsm48_loc_area_id *) msgb_put(msg, sizeof(*lai));
- gsm48_generate_lai(lai, cc, nc, lac);
-
- ci = msgb_put(msg, 2);
- put_data_16(ci, htons(_ci));
+ lai_ci.ident = CELL_IDENT_WHOLE_GLOBAL;
+ gsm48_generate_lai(&lai_ci.lai, cc, nc, lac);
+ lai_ci.ci = htons(_ci);
+ msgb_tlv_put(msg, GSM0808_IE_CELL_IDENTIFIER, sizeof(lai_ci),
+ (uint8_t *) &lai_ci);
/* copy the layer3 data */
- data = msgb_put(msg, msgb_l3len(msg_l3) + 2);
- data[0] = GSM0808_IE_LAYER_3_INFORMATION;
- data[1] = msgb_l3len(msg_l3);
- memcpy(&data[2], msg_l3->l3h, data[1]);
+ msgb_tlv_put(msg, GSM0808_IE_LAYER_3_INFORMATION,
+ msgb_l3len(msg_l3), msg_l3->l3h);
- /* update the size */
- msg->l3h[1] = msgb_l3len(msg) - 2;
+ /* push the bssmap header */
+ msg->l3h = msgb_tv_push(msg, BSSAP_MSG_BSS_MANAGEMENT, msgb_length(msg));
return msg;
}
struct msgb *gsm0808_create_reset(void)
{
+ uint8_t cause = GSM0808_CAUSE_EQUIPMENT_FAILURE;
struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM,
"bssmap: reset");
if (!msg)
return NULL;
- msg->l3h = msgb_put(msg, 6);
- msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT;
- msg->l3h[1] = 0x04;
- msg->l3h[2] = 0x30;
- msg->l3h[3] = 0x04;
- msg->l3h[4] = 0x01;
- msg->l3h[5] = 0x20;
+ msgb_v_put(msg, BSS_MAP_MSG_RESET);
+ msgb_tlv_put(msg, GSM0808_IE_CAUSE, 1, &cause);
+ msg->l3h = msgb_tv_push(msg, BSSAP_MSG_BSS_MANAGEMENT, msgb_length(msg));
+
return msg;
}
@@ -97,13 +80,12 @@ struct msgb *gsm0808_create_clear_complete(void)
{
struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM,
"bssmap: clear complete");
+ uint8_t val = BSS_MAP_MSG_CLEAR_COMPLETE;
if (!msg)
return NULL;
- msg->l3h = msgb_put(msg, 3);
- msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT;
- msg->l3h[1] = 1;
- msg->l3h[2] = BSS_MAP_MSG_CLEAR_COMPLETE;
+ msg->l3h = msg->data;
+ msgb_tlv_put(msg, BSSAP_MSG_BSS_MANAGEMENT, 1, &val);
return msg;
}
@@ -118,6 +100,7 @@ struct msgb *gsm0808_create_clear_command(uint8_t reason)
msg->l3h = msgb_tv_put(msg, BSSAP_MSG_BSS_MANAGEMENT, 4);
msgb_v_put(msg, BSS_MAP_MSG_CLEAR_CMD);
msgb_tlv_put(msg, GSM0808_IE_CAUSE, 1, &reason);
+
return msg;
}
@@ -129,26 +112,20 @@ struct msgb *gsm0808_create_cipher_complete(struct msgb *layer3, uint8_t alg_id)
return NULL;
/* send response with BSS override for A5/1... cheating */
- msg->l3h = msgb_put(msg, 3);
- msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT;
- msg->l3h[1] = 0xff;
- msg->l3h[2] = BSS_MAP_MSG_CIPHER_MODE_COMPLETE;
+ msgb_v_put(msg, BSS_MAP_MSG_CIPHER_MODE_COMPLETE);
/* include layer3 in case we have at least two octets */
if (layer3 && msgb_l3len(layer3) > 2) {
- msg->l4h = msgb_put(msg, msgb_l3len(layer3) + 2);
- msg->l4h[0] = GSM0808_IE_LAYER_3_MESSAGE_CONTENTS;
- msg->l4h[1] = msgb_l3len(layer3);
- memcpy(&msg->l4h[2], layer3->l3h, msgb_l3len(layer3));
+ msg->l4h = msgb_tlv_put(msg, GSM0808_IE_LAYER_3_MESSAGE_CONTENTS,
+ msgb_l3len(layer3), layer3->l3h);
}
/* and the optional BSS message */
- msg->l4h = msgb_put(msg, 2);
- msg->l4h[0] = GSM0808_IE_CHOSEN_ENCR_ALG;
- msg->l4h[1] = alg_id;
+ msgb_tv_put(msg, GSM0808_IE_CHOSEN_ENCR_ALG, alg_id);
+
+ /* pre-pend the header */
+ msg->l3h = msgb_tv_push(msg, BSSAP_MSG_BSS_MANAGEMENT, msgb_length(msg));
- /* update the size */
- msg->l3h[1] = msgb_l3len(msg) - 2;
return msg;
}
@@ -159,11 +136,9 @@ struct msgb *gsm0808_create_cipher_reject(uint8_t cause)
if (!msg)
return NULL;
- msg->l3h = msgb_put(msg, 4);
- msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT;
- msg->l3h[1] = 2;
- msg->l3h[2] = BSS_MAP_MSG_CIPHER_MODE_REJECT;
- msg->l3h[3] = cause;
+ msgb_tv_put(msg, BSS_MAP_MSG_CIPHER_MODE_REJECT, cause);
+
+ msg->l3h = msgb_tv_push(msg, BSSAP_MSG_BSS_MANAGEMENT, msgb_length(msg));
return msg;
}
@@ -175,16 +150,12 @@ struct msgb *gsm0808_create_classmark_update(const uint8_t *classmark_data, uint
if (!msg)
return NULL;
- msg->l3h = msgb_put(msg, 3);
- msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT;
- msg->l3h[1] = 0xff;
- msg->l3h[2] = BSS_MAP_MSG_CLASSMARK_UPDATE;
-
+ msgb_v_put(msg, BSS_MAP_MSG_CLASSMARK_UPDATE);
msg->l4h = msgb_put(msg, length);
memcpy(msg->l4h, classmark_data, length);
- /* update the size */
- msg->l3h[1] = msgb_l3len(msg) - 2;
+ msg->l3h = msgb_tv_push(msg, BSSAP_MSG_BSS_MANAGEMENT, msgb_length(msg));
+
return msg;
}
@@ -195,12 +166,11 @@ struct msgb *gsm0808_create_sapi_reject(uint8_t link_id)
if (!msg)
return NULL;
- msg->l3h = msgb_put(msg, 5);
- msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT;
- msg->l3h[1] = 3;
- msg->l3h[2] = BSS_MAP_MSG_SAPI_N_REJECT;
- msg->l3h[3] = link_id;
- msg->l3h[4] = GSM0808_CAUSE_BSS_NOT_EQUIPPED;
+ msgb_v_put(msg, BSS_MAP_MSG_SAPI_N_REJECT);
+ msgb_v_put(msg, link_id);
+ msgb_v_put(msg, GSM0808_CAUSE_BSS_NOT_EQUIPPED);
+
+ msg->l3h = msgb_tv_push(msg, BSSAP_MSG_BSS_MANAGEMENT, msgb_length(msg));
return msg;
}
@@ -209,78 +179,56 @@ struct msgb *gsm0808_create_assignment_completed(uint8_t rr_cause,
uint8_t chosen_channel, uint8_t encr_alg_id,
uint8_t speech_mode)
{
- uint8_t *data;
-
- struct msgb *msg = msgb_alloc(35, "bssmap: ass compl");
+ struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM,
+ "bssmap: ass compl");
if (!msg)
return NULL;
- msg->l3h = msgb_put(msg, 3);
- msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT;
- msg->l3h[1] = 0xff;
- msg->l3h[2] = BSS_MAP_MSG_ASSIGMENT_COMPLETE;
+ msgb_v_put(msg, BSS_MAP_MSG_ASSIGMENT_COMPLETE);
/* write 3.2.2.22 */
- data = msgb_put(msg, 2);
- data[0] = GSM0808_IE_RR_CAUSE;
- data[1] = rr_cause;
+ msgb_tv_put(msg, GSM0808_IE_RR_CAUSE, rr_cause);
/* write cirtcuit identity code 3.2.2.2 */
/* write cell identifier 3.2.2.17 */
/* write chosen channel 3.2.2.33 when BTS picked it */
- data = msgb_put(msg, 2);
- data[0] = GSM0808_IE_CHOSEN_CHANNEL;
- data[1] = chosen_channel;
+ msgb_tv_put(msg, GSM0808_IE_CHOSEN_CHANNEL, chosen_channel);
/* write chosen encryption algorithm 3.2.2.44 */
- data = msgb_put(msg, 2);
- data[0] = GSM0808_IE_CHOSEN_ENCR_ALG;
- data[1] = encr_alg_id;
+ msgb_tv_put(msg, GSM0808_IE_CHOSEN_ENCR_ALG, encr_alg_id);
/* write circuit pool 3.2.2.45 */
/* write speech version chosen: 3.2.2.51 when BTS picked it */
- if (speech_mode != 0) {
- data = msgb_put(msg, 2);
- data[0] = GSM0808_IE_SPEECH_VERSION;
- data[1] = speech_mode;
- }
+ if (speech_mode != 0)
+ msgb_tv_put(msg, GSM0808_IE_SPEECH_VERSION, speech_mode);
/* write LSA identifier 3.2.2.15 */
+ msg->l3h = msgb_tv_push(msg, BSSAP_MSG_BSS_MANAGEMENT, msgb_length(msg));
- /* update the size */
- msg->l3h[1] = msgb_l3len(msg) - 2;
return msg;
}
struct msgb *gsm0808_create_assignment_failure(uint8_t cause, uint8_t *rr_cause)
{
- uint8_t *data;
struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM,
"bssmap: ass fail");
if (!msg)
return NULL;
- msg->l3h = msgb_put(msg, 6);
- msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT;
- msg->l3h[1] = 0xff;
- msg->l3h[2] = BSS_MAP_MSG_ASSIGMENT_FAILURE;
- msg->l3h[3] = GSM0808_IE_CAUSE;
- msg->l3h[4] = 1;
- msg->l3h[5] = cause;
+ msgb_v_put(msg, BSS_MAP_MSG_ASSIGMENT_FAILURE);
+ msgb_tlv_put(msg, GSM0808_IE_CAUSE, 1, &cause);
/* RR cause 3.2.2.22 */
- if (rr_cause) {
- data = msgb_put(msg, 2);
- data[0] = GSM0808_IE_RR_CAUSE;
- data[1] = *rr_cause;
- }
+ if (rr_cause)
+ msgb_tv_put(msg, GSM0808_IE_RR_CAUSE, *rr_cause);
/* Circuit pool 3.22.45 */
/* Circuit pool list 3.2.2.46 */
/* update the size */
- msg->l3h[1] = msgb_l3len(msg) - 2;
+ msg->l3h = msgb_tv_push(msg, BSSAP_MSG_BSS_MANAGEMENT, msgb_length(msg));
+
return msg;
}
@@ -293,14 +241,10 @@ struct msgb *gsm0808_create_clear_rqst(uint8_t cause)
if (!msg)
return NULL;
- msg->l3h = msgb_put(msg, 2 + 4);
- msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT;
- msg->l3h[1] = 4;
+ msgb_v_put(msg, BSS_MAP_MSG_CLEAR_RQST);
+ msgb_tlv_put(msg, GSM0808_IE_CAUSE, 1, &cause);
+ msg->l3h = msgb_tv_push(msg, BSSAP_MSG_BSS_MANAGEMENT, msgb_length(msg));
- msg->l3h[2] = BSS_MAP_MSG_CLEAR_RQST;
- msg->l3h[3] = GSM0808_IE_CAUSE;
- msg->l3h[4] = 1;
- msg->l3h[5] = cause;
return msg;
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-01-10 15:19:19 +0000