From 8f77cbecb4df9a8ce1a695ca24799d5c02da4ec1 Mon Sep 17 00:00:00 2001 From: Andreas Eversberg Date: Mon, 19 Sep 2011 19:49:22 +0200 Subject: host/layer23: Removed local copy of LAPDm, using libosmocore instad Since libosmocore already has LAPDm implementation, we don't need the local copy of LAPDm code anymore. Written-by: Andreas Eversberg Signed-off-by: Sylvain Munaut --- .../layer23/include/osmocom/bb/common/Makefile.am | 2 +- src/host/layer23/include/osmocom/bb/common/lapdm.h | 186 -- .../layer23/include/osmocom/bb/common/logging.h | 1 - .../include/osmocom/bb/common/osmocom_data.h | 2 +- src/host/layer23/src/common/Makefile.am | 2 +- src/host/layer23/src/common/l1ctl.c | 2 +- src/host/layer23/src/common/l1ctl_lapdm_glue.c | 2 +- src/host/layer23/src/common/lapdm.c | 2510 -------------------- src/host/layer23/src/common/logging.c | 5 - src/host/layer23/src/common/main.c | 1 - src/host/layer23/src/misc/app_bcch_scan.c | 1 - src/host/layer23/src/misc/app_cbch_sniff.c | 1 - src/host/layer23/src/misc/app_ccch_scan.c | 1 - src/host/layer23/src/misc/app_echo_test.c | 1 - src/host/layer23/src/misc/bcch_scan.c | 1 - src/host/layer23/src/misc/cell_log.c | 1 - src/host/layer23/src/misc/rslms.c | 2 +- src/host/layer23/src/mobile/app_mobile.c | 1 - 18 files changed, 6 insertions(+), 2716 deletions(-) delete mode 100644 src/host/layer23/include/osmocom/bb/common/lapdm.h delete mode 100644 src/host/layer23/src/common/lapdm.c diff --git a/src/host/layer23/include/osmocom/bb/common/Makefile.am b/src/host/layer23/include/osmocom/bb/common/Makefile.am index 26e63cfe..945c73db 100644 --- a/src/host/layer23/include/osmocom/bb/common/Makefile.am +++ b/src/host/layer23/include/osmocom/bb/common/Makefile.am @@ -1,2 +1,2 @@ -noinst_HEADERS = l1ctl.h l1l2_interface.h l23_app.h lapdm.h logging.h \ +noinst_HEADERS = l1ctl.h l1l2_interface.h l23_app.h logging.h \ networks.h gps.h sysinfo.h osmocom_data.h diff --git a/src/host/layer23/include/osmocom/bb/common/lapdm.h b/src/host/layer23/include/osmocom/bb/common/lapdm.h deleted file mode 100644 index 2e78aeee..00000000 --- a/src/host/layer23/include/osmocom/bb/common/lapdm.h +++ /dev/null @@ -1,186 +0,0 @@ -#ifndef _OSMOCOM_LAPDM_H -#define _OSMOCOM_LAPDM_H - -#include - -#include -#include -#include - -/* primitive related sutff */ - -enum osmo_ph_prim { - PRIM_PH_DATA, /* PH-DATA */ - PRIM_PH_RACH, /* PH-RANDOM_ACCESS */ - PRIM_PH_CONN, /* PH-CONNECT */ - PRIM_PH_EMPTY_FRAME, /* PH-EMPTY_FRAME */ - PRIM_PH_RTS, /* PH-RTS */ -}; - -/* for PH-RANDOM_ACCESS.req */ -struct ph_rach_req_param { - uint8_t ra; - uint8_t ta; - uint8_t tx_power; - uint8_t is_combined_ccch; - uint16_t offset; -}; - -/* for PH-RANDOM_ACCESS.ind */ -struct ph_rach_ind_param { - uint8_t ra; - uint8_t acc_delay; - uint32_t fn; -}; - -/* for PH-[UNIT]DATA.{req,ind} */ -struct ph_data_param { - uint8_t link_id; - uint8_t chan_nr; -}; - -struct ph_conn_ind_param { - uint32_t fn; -}; - -struct osmo_phsap_prim { - struct osmo_prim_hdr oph; - union { - struct ph_data_param data; - struct ph_rach_req_param rach_req; - struct ph_rach_ind_param rach_ind; - struct ph_conn_ind_param conn_ind; - } u; -}; - -enum lapdm_mode { - LAPDM_MODE_MS, - LAPDM_MODE_BTS, -}; - -enum lapdm_state { - LAPDm_STATE_NULL = 0, - LAPDm_STATE_IDLE, - LAPDm_STATE_SABM_SENT, - LAPDm_STATE_MF_EST, - LAPDm_STATE_TIMER_RECOV, - LAPDm_STATE_DISC_SENT, -}; - -struct lapdm_entity; - -struct lapdm_msg_ctx { - struct lapdm_datalink *dl; - int lapdm_fmt; - uint8_t n201; - uint8_t chan_nr; - uint8_t link_id; - uint8_t addr; - uint8_t ctrl; - uint8_t ta_ind; - uint8_t tx_power_ind; -}; - -/* TS 04.06 / Section 3.5.2 */ -struct lapdm_datalink { - uint8_t V_send; /* seq nr of next I frame to be transmitted */ - uint8_t V_ack; /* last frame ACKed by peer */ - uint8_t N_send; /* ? set to V_send at Tx time*/ - uint8_t V_recv; /* seq nr of next I frame expected to be received */ - uint8_t N_recv; /* expected send seq nr of the next received I frame */ - uint32_t state; - int seq_err_cond; /* condition of sequence error */ - uint8_t own_busy, peer_busy; - struct osmo_timer_list t200; - uint8_t retrans_ctr; - struct llist_head send_queue; /* frames from L3 */ - struct msgb *send_buffer; /* current frame transmitting */ - int send_out; /* how much was sent from send_buffer */ - uint8_t tx_hist[8][200]; /* tx history buffer */ - int tx_length[8]; /* length in history buffer */ - struct llist_head tx_queue; /* frames to L1 */ - struct lapdm_msg_ctx mctx; /* context of established connection */ - struct msgb *rcv_buffer; /* buffer to assemble the received message */ - - struct lapdm_entity *entity; -}; - -enum lapdm_dl_sapi { - DL_SAPI0 = 0, - DL_SAPI3 = 1, - _NR_DL_SAPI -}; - -typedef int (*lapdm_cb_t)(struct msgb *msg, struct lapdm_entity *le, void *ctx); - -struct lapdm_cr_ent { - uint8_t cmd; - uint8_t resp; -}; - -#define LAPDM_ENT_F_EMPTY_FRAME 0x0001 -#define LAPDM_ENT_F_POLLING_ONLY 0x0002 - -/* register message handler for messages that are sent from L2->L3 */ -struct lapdm_entity { - struct lapdm_datalink datalink[_NR_DL_SAPI]; - int last_tx_dequeue; /* last entity that was dequeued */ - int tx_pending; /* currently a pending frame not confirmed by L1 */ - enum lapdm_mode mode; /* are we in BTS mode or MS mode */ - unsigned int flags; - - struct { - /* filled-in once we set the lapdm_mode above */ - struct lapdm_cr_ent loc2rem; - struct lapdm_cr_ent rem2loc; - } cr; - - void *l1_ctx; /* context for layer1 instance */ - void *l3_ctx; /* context for layer3 instance */ - - osmo_prim_cb l1_prim_cb; - lapdm_cb_t l3_cb; /* callback for sending stuff to L3 */ - - struct lapdm_channel *lapdm_ch; -}; - -/* the two lapdm_entities that form a GSM logical channel (ACCH + DCCH) */ -struct lapdm_channel { - struct llist_head list; - char *name; - struct lapdm_entity lapdm_acch; - struct lapdm_entity lapdm_dcch; -}; - -const char *get_rsl_name(int value); -extern const char *lapdm_state_names[]; - -/* initialize a LAPDm entity */ -void lapdm_entity_init(struct lapdm_entity *le, enum lapdm_mode mode); -void lapdm_channel_init(struct lapdm_channel *lc, enum lapdm_mode mode); - -/* deinitialize a LAPDm entity */ -void lapdm_entity_exit(struct lapdm_entity *le); -void lapdm_channel_exit(struct lapdm_channel *lc); - -/* input into layer2 (from layer 1) */ -int lapdm_phsap_up(struct osmo_prim_hdr *oph, struct lapdm_entity *le); - -/* input into layer2 (from layer 3) */ -int lapdm_rslms_recvmsg(struct msgb *msg, struct lapdm_channel *lc); - -void lapdm_channel_set_l3(struct lapdm_channel *lc, lapdm_cb_t cb, void *ctx); -void lapdm_channel_set_l1(struct lapdm_channel *lc, osmo_prim_cb cb, void *ctx); - -int lapdm_entity_set_mode(struct lapdm_entity *le, enum lapdm_mode mode); -int lapdm_channel_set_mode(struct lapdm_channel *lc, enum lapdm_mode mode); - -void lapdm_entity_reset(struct lapdm_entity *le); -void lapdm_channel_reset(struct lapdm_channel *lc); - -void lapdm_entity_set_flags(struct lapdm_entity *le, unsigned int flags); -void lapdm_channel_set_flags(struct lapdm_channel *lc, unsigned int flags); - -int lapdm_phsap_dequeue_prim(struct lapdm_entity *le, struct osmo_phsap_prim *pp); - -#endif /* _OSMOCOM_LAPDM_H */ diff --git a/src/host/layer23/include/osmocom/bb/common/logging.h b/src/host/layer23/include/osmocom/bb/common/logging.h index 554b7670..2cb58354 100644 --- a/src/host/layer23/include/osmocom/bb/common/logging.h +++ b/src/host/layer23/include/osmocom/bb/common/logging.h @@ -16,7 +16,6 @@ enum { DMNCC, DMEAS, DPAG, - DLAPDM, DL1C, DSAP, DSUM, diff --git a/src/host/layer23/include/osmocom/bb/common/osmocom_data.h b/src/host/layer23/include/osmocom/bb/common/osmocom_data.h index 8f150078..ab7c2502 100644 --- a/src/host/layer23/include/osmocom/bb/common/osmocom_data.h +++ b/src/host/layer23/include/osmocom/bb/common/osmocom_data.h @@ -11,7 +11,7 @@ struct osmocom_ms; #include #include #include -#include +#include #include #include #include diff --git a/src/host/layer23/src/common/Makefile.am b/src/host/layer23/src/common/Makefile.am index aca2eb48..73a0fc96 100644 --- a/src/host/layer23/src/common/Makefile.am +++ b/src/host/layer23/src/common/Makefile.am @@ -2,5 +2,5 @@ INCLUDES = $(all_includes) -I$(top_srcdir)/include AM_CFLAGS = -Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) noinst_LIBRARIES = liblayer23.a -liblayer23_a_SOURCES = l1ctl.c l1l2_interface.c sap_interface.c lapdm.c \ +liblayer23_a_SOURCES = l1ctl.c l1l2_interface.c sap_interface.c \ logging.c networks.c sim.c sysinfo.c gps.c l1ctl_lapdm_glue.c diff --git a/src/host/layer23/src/common/l1ctl.c b/src/host/layer23/src/common/l1ctl.c index e3ab4c9c..f998ebcf 100644 --- a/src/host/layer23/src/common/l1ctl.c +++ b/src/host/layer23/src/common/l1ctl.c @@ -44,7 +44,7 @@ #include #include #include -#include +#include #include #include diff --git a/src/host/layer23/src/common/l1ctl_lapdm_glue.c b/src/host/layer23/src/common/l1ctl_lapdm_glue.c index db071a35..0b2a8ed5 100644 --- a/src/host/layer23/src/common/l1ctl_lapdm_glue.c +++ b/src/host/layer23/src/common/l1ctl_lapdm_glue.c @@ -27,7 +27,7 @@ #include #include -#include +#include /* LAPDm wants to send a PH-* primitive to the physical layer (L1) */ int l1ctl_ph_prim_cb(struct osmo_prim_hdr *oph, void *ctx) diff --git a/src/host/layer23/src/common/lapdm.c b/src/host/layer23/src/common/lapdm.c deleted file mode 100644 index 1fbebe61..00000000 --- a/src/host/layer23/src/common/lapdm.c +++ /dev/null @@ -1,2510 +0,0 @@ -/* GSM LAPDm (TS 04.06) implementation */ - -/* (C) 2010-2011 by Harald Welte - * (C) 2010 by Andreas Eversberg - * - * 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. - * - */ - -/* Notes on Buffering: rcv_buffer, tx_queue, tx_hist, send_buffer, send_queue - * - * RX data is stored in the rcv_buffer (pointer). If the message is complete, it - * is removed from rcv_buffer pointer and forwarded to L3. If the RX data is - * received while there is an incomplete rcv_buffer, it is appended to it. - * - * TX data is stored in the send_queue first. When transmitting a frame, - * the first message in the send_queue is moved to the send_buffer. There it - * resides until all fragments are acknowledged. Fragments to be sent by I - * frames are stored in the tx_hist buffer for resend, if required. Also the - * current fragment is copied into the tx_queue. There it resides until it is - * forwarded to layer 1. - * - * In case we have SAPI 0, we only have a window size of 1, so the unack- - * nowledged message resides always in the send_buffer. In case of a suspend, - * it can be written back to the first position of the send_queue. - * - * The layer 1 normally sends a PH-READY-TO-SEND. But because we use - * asynchronous transfer between layer 1 and layer 2 (serial link), we must - * send a frame before layer 1 reaches the right timeslot to send it. So we - * move the tx_queue to layer 1 when there is not already a pending frame, and - * wait until acknowledge after the frame has been sent. If we receive an - * acknowledge, we can send the next frame from the buffer, if any. - * - * The moving of tx_queue to layer 1 may also trigger T200, if desired. Also it - * will trigger next I frame, if possible. - * - */ - -#include -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include - -/* TS 04.06 Figure 4 / Section 3.2 */ -#define LAPDm_LPD_NORMAL 0 -#define LAPDm_LPD_SMSCB 1 -#define LAPDm_SAPI_NORMAL 0 -#define LAPDm_SAPI_SMS 3 -#define LAPDm_ADDR(lpd, sapi, cr) ((((lpd) & 0x3) << 5) | (((sapi) & 0x7) << 2) | (((cr) & 0x1) << 1) | 0x1) - -#define LAPDm_ADDR_SAPI(addr) (((addr) >> 2) & 0x7) -#define LAPDm_ADDR_CR(addr) (((addr) >> 1) & 0x1) -#define LAPDm_ADDR_EA(addr) ((addr) & 0x1) - -/* TS 04.06 Table 3 / Section 3.4.3 */ -#define LAPDm_CTRL_I(nr, ns, p) ((((nr) & 0x7) << 5) | (((p) & 0x1) << 4) | (((ns) & 0x7) << 1)) -#define LAPDm_CTRL_S(nr, s, p) ((((nr) & 0x7) << 5) | (((p) & 0x1) << 4) | (((s) & 0x3) << 2) | 0x1) -#define LAPDm_CTRL_U(u, p) ((((u) & 0x1c) << (5-2)) | (((p) & 0x1) << 4) | (((u) & 0x3) << 2) | 0x3) - -#define LAPDm_CTRL_is_I(ctrl) (((ctrl) & 0x1) == 0) -#define LAPDm_CTRL_is_S(ctrl) (((ctrl) & 0x3) == 1) -#define LAPDm_CTRL_is_U(ctrl) (((ctrl) & 0x3) == 3) - -#define LAPDm_CTRL_U_BITS(ctrl) ((((ctrl) & 0xC) >> 2) | ((ctrl) & 0xE0) >> 3) -#define LAPDm_CTRL_PF_BIT(ctrl) (((ctrl) >> 4) & 0x1) - -#define LAPDm_CTRL_S_BITS(ctrl) (((ctrl) & 0xC) >> 2) - -#define LAPDm_CTRL_I_Ns(ctrl) (((ctrl) & 0xE) >> 1) -#define LAPDm_CTRL_Nr(ctrl) (((ctrl) & 0xE0) >> 5) - -/* TS 04.06 Table 4 / Section 3.8.1 */ -#define LAPDm_U_SABM 0x7 -#define LAPDm_U_DM 0x3 -#define LAPDm_U_UI 0x0 -#define LAPDm_U_DISC 0x8 -#define LAPDm_U_UA 0xC - -#define LAPDm_S_RR 0x0 -#define LAPDm_S_RNR 0x1 -#define LAPDm_S_REJ 0x2 - -#define LAPDm_LEN(len) ((len << 2) | 0x1) -#define LAPDm_MORE 0x2 - -/* TS 04.06 Section 5.8.3 */ -#define N201_AB_SACCH 18 -#define N201_AB_SDCCH 20 -#define N201_AB_FACCH 20 -#define N201_Bbis 23 -#define N201_Bter_SACCH 21 -#define N201_Bter_SDCCH 23 -#define N201_Bter_FACCH 23 -#define N201_B4 19 - -/* 5.8.2.1 N200 during establish and release */ -#define N200_EST_REL 5 -/* 5.8.2.1 N200 during timer recovery state */ -#define N200_TR_SACCH 5 -#define N200_TR_SDCCH 23 -#define N200_TR_FACCH_FR 34 -#define N200_TR_EFACCH_FR 48 -#define N200_TR_FACCH_HR 29 -/* FIXME: this depends on chan type */ -#define N200 N200_TR_SACCH - -#define CR_MS2BS_CMD 0 -#define CR_MS2BS_RESP 1 -#define CR_BS2MS_CMD 1 -#define CR_BS2MS_RESP 0 - -/* Set T200 to 1 Second (OpenBTS uses 900ms) */ -#define T200 1, 0 - -/* k value for each SAPI */ -static uint8_t k_sapi[] = {1, 1, 1, 1, 1, 1, 1, 1}; - -enum lapdm_format { - LAPDm_FMT_A, - LAPDm_FMT_B, - LAPDm_FMT_Bbis, - LAPDm_FMT_Bter, - LAPDm_FMT_B4, -}; - -static void lapdm_t200_cb(void *data); -static int rslms_send_i(struct lapdm_msg_ctx *mctx, int line); - -/* UTILITY FUNCTIONS */ - -static inline uint8_t inc_mod8(uint8_t x) -{ - return (x + 1) & 7; -} - -static inline uint8_t add_mod8(uint8_t x, uint8_t y) -{ - return (x + y) & 7; -} - -static inline uint8_t sub_mod8(uint8_t x, uint8_t y) -{ - return (x - y) & 7; /* handle negative results correctly */ -} - -static void lapdm_dl_init(struct lapdm_datalink *dl, - struct lapdm_entity *entity) -{ - memset(dl, 0, sizeof(*dl)); - INIT_LLIST_HEAD(&dl->send_queue); - INIT_LLIST_HEAD(&dl->tx_queue); - dl->state = LAPDm_STATE_IDLE; - dl->t200.data = dl; - dl->t200.cb = &lapdm_t200_cb; - dl->entity = entity; -} - -void lapdm_entity_init(struct lapdm_entity *le, enum lapdm_mode mode) -{ - unsigned int i; - - for (i = 0; i < ARRAY_SIZE(le->datalink); i++) - lapdm_dl_init(&le->datalink[i], le); - - lapdm_entity_set_mode(le, mode); -} - -void lapdm_channel_init(struct lapdm_channel *lc, enum lapdm_mode mode) -{ - lapdm_entity_init(&lc->lapdm_acch, mode); - lapdm_entity_init(&lc->lapdm_dcch, mode); -} - - -static void lapdm_dl_flush_send(struct lapdm_datalink *dl) -{ - struct msgb *msg; - - /* Flush send-queue */ - while ((msg = msgb_dequeue(&dl->send_queue))) - msgb_free(msg); - - /* Clear send-buffer */ - if (dl->send_buffer) { - msgb_free(dl->send_buffer); - dl->send_buffer = NULL; - } -} - -static void lapdm_dl_flush_tx(struct lapdm_datalink *dl) -{ - struct msgb *msg; - unsigned int i; - - while ((msg = msgb_dequeue(&dl->tx_queue))) - msgb_free(msg); - for (i = 0; i < 8; i++) - dl->tx_length[i] = 0; -} - -void lapdm_entity_exit(struct lapdm_entity *le) -{ - unsigned int i; - struct lapdm_datalink *dl; - - for (i = 0; i < ARRAY_SIZE(le->datalink); i++) { - dl = &le->datalink[i]; - lapdm_dl_flush_tx(dl); - lapdm_dl_flush_send(dl); - if (dl->rcv_buffer) - msgb_free(dl->rcv_buffer); - } -} - -void lapdm_channel_exit(struct lapdm_channel *lc) -{ - lapdm_entity_exit(&lc->lapdm_acch); - lapdm_entity_exit(&lc->lapdm_dcch); -} - -static void lapdm_dl_newstate(struct lapdm_datalink *dl, uint32_t state) -{ - LOGP(DLAPDM, LOGL_INFO, "new state %s -> %s\n", - lapdm_state_names[dl->state], lapdm_state_names[state]); - - dl->state = state; -} - -static struct lapdm_datalink *datalink_for_sapi(struct lapdm_entity *le, uint8_t sapi) -{ - switch (sapi) { - case LAPDm_SAPI_NORMAL: - return &le->datalink[0]; - case LAPDm_SAPI_SMS: - return &le->datalink[1]; - default: - return NULL; - } -} - -/* remove the L2 header from a MSGB */ -static inline unsigned char *msgb_pull_l2h(struct msgb *msg) -{ - unsigned char *ret = msgb_pull(msg, msg->l3h - msg->l2h); - msg->l2h = NULL; - return ret; -} - -/* Append padding (if required) */ -static void lapdm_pad_msgb(struct msgb *msg, uint8_t n201) -{ - int pad_len = n201 - msgb_l2len(msg); - uint8_t *data; - - if (pad_len < 0) { - LOGP(DLAPDM, LOGL_ERROR, - "cannot pad message that is already too big!\n"); - return; - } - - data = msgb_put(msg, pad_len); - memset(data, 0x2B, pad_len); -} - -/* input function that L2 calls when sending messages up to L3 */ -static int rslms_sendmsg(struct msgb *msg, struct lapdm_entity *le) -{ - if (!le->l3_cb) { - msgb_free(msg); - return -EIO; - } - - /* call the layer2 message handler that is registered */ - return le->l3_cb(msg, le, le->l3_ctx); -} - -/* write a frame into the tx queue */ -static int tx_ph_data_enqueue(struct lapdm_datalink *dl, struct msgb *msg, - uint8_t chan_nr, uint8_t link_id, uint8_t n201) -{ - struct lapdm_entity *le = dl->entity; - struct osmo_phsap_prim pp; - - /* if there is a pending message, queue it */ - if (le->tx_pending || le->flags & LAPDM_ENT_F_POLLING_ONLY) { - *msgb_push(msg, 1) = n201; - *msgb_push(msg, 1) = link_id; - *msgb_push(msg, 1) = chan_nr; - msgb_enqueue(&dl->tx_queue, msg); - return -EBUSY; - } - - osmo_prim_init(&pp.oph, SAP_GSM_PH, PRIM_PH_DATA, - PRIM_OP_REQUEST, msg); - pp.u.data.chan_nr = chan_nr; - pp.u.data.link_id = link_id; - - /* send the frame now */ - le->tx_pending = 0; /* disabled flow control */ - lapdm_pad_msgb(msg, n201); - - return le->l1_prim_cb(&pp.oph, le->l1_ctx); -} - -static struct msgb *tx_dequeue_msgb(struct lapdm_entity *le) -{ - struct lapdm_datalink *dl; - int last = le->last_tx_dequeue; - int i = last, n = ARRAY_SIZE(le->datalink); - struct msgb *msg = NULL; - - /* round-robin dequeue */ - do { - /* next */ - i = (i + 1) % n; - dl = &le->datalink[i]; - if ((msg = msgb_dequeue(&dl->tx_queue))) - break; - } while (i != last); - - if (msg) { - /* Set last dequeue position */ - le->last_tx_dequeue = i; - } - - return msg; -} - -/* dequeue a msg that's pending transmission via L1 and wrap it into - * a osmo_phsap_prim */ -int lapdm_phsap_dequeue_prim(struct lapdm_entity *le, struct osmo_phsap_prim *pp) -{ - struct msgb *msg; - uint8_t n201; - - msg = tx_dequeue_msgb(le); - if (!msg) - return -ENODEV; - - /* if we have a message, send PH-DATA.req */ - osmo_prim_init(&pp->oph, SAP_GSM_PH, PRIM_PH_DATA, - PRIM_OP_REQUEST, msg); - - /* Pull chan_nr and link_id */ - pp->u.data.chan_nr = *msg->data; - msgb_pull(msg, 1); - pp->u.data.link_id = *msg->data; - msgb_pull(msg, 1); - n201 = *msg->data; - msgb_pull(msg, 1); - - /* Pad the frame, we can transmit now */ - lapdm_pad_msgb(msg, n201); - - return 0; -} - -/* get next frame from the tx queue. because the ms has multiple datalinks, - * each datalink's queue is read round-robin. - */ -static int l2_ph_data_conf(struct msgb *msg, struct lapdm_entity *le) -{ - struct osmo_phsap_prim pp; - - /* we may send again */ - le->tx_pending = 0; - - /* free confirm message */ - if (msg) - msgb_free(msg); - - if (lapdm_phsap_dequeue_prim(le, &pp) < 0) { - /* no message in all queues */ - - /* If user didn't request PH-EMPTY_FRAME.req, abort */ - if (!(le->flags & LAPDM_ENT_F_EMPTY_FRAME)) - return 0; - - /* otherwise, send PH-EMPTY_FRAME.req */ - osmo_prim_init(&pp.oph, SAP_GSM_PH, - PRIM_PH_EMPTY_FRAME, - PRIM_OP_REQUEST, NULL); - } else { - le->tx_pending = 1; - } - - return le->l1_prim_cb(&pp.oph, le->l1_ctx); -} - -/* Create RSLms various RSLms messages */ -static int send_rslms_rll_l3(uint8_t msg_type, struct lapdm_msg_ctx *mctx, - struct msgb *msg) -{ - /* Add the RSL + RLL header */ - rsl_rll_push_l3(msg, msg_type, mctx->chan_nr, mctx->link_id, 1); - - /* send off the RSLms message to L3 */ - return rslms_sendmsg(msg, mctx->dl->entity); -} - -/* Take a B4 format message from L1 and create RSLms UNIT DATA IND */ -static int send_rslms_rll_l3_ui(struct lapdm_msg_ctx *mctx, struct msgb *msg) -{ - uint8_t l3_len = msg->tail - (uint8_t *)msgb_l3(msg); - struct abis_rsl_rll_hdr *rllh; - - /* Add the RSL + RLL header */ - msgb_tv16_push(msg, RSL_IE_L3_INFO, l3_len); - msgb_push(msg, 2 + 2); - rsl_rll_push_hdr(msg, RSL_MT_UNIT_DATA_IND, mctx->chan_nr, - mctx->link_id, 1); - rllh = (struct abis_rsl_rll_hdr *)msgb_l2(msg); - - rllh->data[0] = RSL_IE_TIMING_ADVANCE; - rllh->data[1] = mctx->ta_ind; - - rllh->data[2] = RSL_IE_MS_POWER; - rllh->data[3] = mctx->tx_power_ind; - - return rslms_sendmsg(msg, mctx->dl->entity); -} - -static int send_rll_simple(uint8_t msg_type, struct lapdm_msg_ctx *mctx) -{ - struct msgb *msg; - - msg = rsl_rll_simple(msg_type, mctx->chan_nr, mctx->link_id, 1); - - /* send off the RSLms message to L3 */ - return rslms_sendmsg(msg, mctx->dl->entity); -} - -static int rsl_rll_error(uint8_t cause, struct lapdm_msg_ctx *mctx) -{ - struct msgb *msg; - - LOGP(DLAPDM, LOGL_NOTICE, "sending MDL-ERROR-IND %d\n", cause); - msg = rsl_rll_simple(RSL_MT_ERROR_IND, mctx->chan_nr, mctx->link_id, 1); - msg->l2h = msgb_put(msg, sizeof(struct abis_rsl_rll_hdr)); - msgb_tlv_put(msg, RSL_IE_RLM_CAUSE, 1, &cause); - return rslms_sendmsg(msg, mctx->dl->entity); -} - -static int check_length_ind(struct lapdm_msg_ctx *mctx, uint8_t length_ind) -{ - if (!(length_ind & 0x01)) { - /* G.4.1 If the EL bit is set to "0", an MDL-ERROR-INDICATION - * primitive with cause "frame not implemented" is sent to the - * mobile management entity. */ - LOGP(DLAPDM, LOGL_NOTICE, - "we don't support multi-octet length\n"); - rsl_rll_error(RLL_CAUSE_FRM_UNIMPL, mctx); - return -EINVAL; - } - return 0; -} - -static int lapdm_send_resend(struct lapdm_datalink *dl) -{ - struct msgb *msg = msgb_alloc_headroom(23+10, 10, "LAPDm resend"); - int length; - - /* Resend SABM/DISC from tx_hist */ - length = dl->tx_length[0]; - msg->l2h = msgb_put(msg, length); - memcpy(msg->l2h, dl->tx_hist[dl->V_send], length); - - return tx_ph_data_enqueue(dl, msg, dl->mctx.chan_nr, dl->mctx.link_id, - dl->mctx.n201); -} - -static int lapdm_send_ua(struct lapdm_msg_ctx *mctx, uint8_t len, uint8_t *data) -{ - uint8_t sapi = mctx->link_id & 7; - uint8_t f_bit = LAPDm_CTRL_PF_BIT(mctx->ctrl); - struct msgb *msg = msgb_alloc_headroom(23+10, 10, "LAPDm UA"); - struct lapdm_entity *le = mctx->dl->entity; - - msg->l2h = msgb_put(msg, 3 + len); - msg->l2h[0] = LAPDm_ADDR(LAPDm_LPD_NORMAL, sapi, le->cr.loc2rem.resp); - msg->l2h[1] = LAPDm_CTRL_U(LAPDm_U_UA, f_bit); - msg->l2h[2] = LAPDm_LEN(len); - if (len) - memcpy(msg->l2h + 3, data, len); - - return tx_ph_data_enqueue(mctx->dl, msg, mctx->chan_nr, mctx->link_id, - mctx->n201); -} - -static int lapdm_send_dm(struct lapdm_msg_ctx *mctx) -{ - uint8_t sapi = mctx->link_id & 7; - uint8_t f_bit = LAPDm_CTRL_PF_BIT(mctx->ctrl); - struct msgb *msg = msgb_alloc_headroom(23+10, 10, "LAPDm DM"); - struct lapdm_entity *le = mctx->dl->entity; - - msg->l2h = msgb_put(msg, 3); - msg->l2h[0] = LAPDm_ADDR(LAPDm_LPD_NORMAL, sapi, le->cr.loc2rem.resp); - msg->l2h[1] = LAPDm_CTRL_U(LAPDm_U_DM, f_bit); - msg->l2h[2] = 0; - - return tx_ph_data_enqueue(mctx->dl, msg, mctx->chan_nr, mctx->link_id, - mctx->n201); -} - -static int lapdm_send_rr(struct lapdm_msg_ctx *mctx, uint8_t f_bit) -{ - uint8_t sapi = mctx->link_id & 7; - struct msgb *msg = msgb_alloc_headroom(23+10, 10, "LAPDm RR"); - struct lapdm_entity *le = mctx->dl->entity; - - msg->l2h = msgb_put(msg, 3); - msg->l2h[0] = LAPDm_ADDR(LAPDm_LPD_NORMAL, sapi, le->cr.loc2rem.resp); - msg->l2h[1] = LAPDm_CTRL_S(mctx->dl->V_recv, LAPDm_S_RR, f_bit); - msg->l2h[2] = LAPDm_LEN(0); - - return tx_ph_data_enqueue(mctx->dl, msg, mctx->chan_nr, mctx->link_id, - mctx->n201); -} - -static int lapdm_send_rnr(struct lapdm_msg_ctx *mctx, uint8_t f_bit) -{ - uint8_t sapi = mctx->link_id & 7; - struct msgb *msg = msgb_alloc_headroom(23+10, 10, "LAPDm RNR"); - struct lapdm_entity *le = mctx->dl->entity; - - msg->l2h = msgb_put(msg, 3); - msg->l2h[0] = LAPDm_ADDR(LAPDm_LPD_NORMAL, sapi, le->cr.loc2rem.resp); - msg->l2h[1] = LAPDm_CTRL_S(mctx->dl->V_recv, LAPDm_S_RNR, f_bit); - msg->l2h[2] = LAPDm_LEN(0); - - return tx_ph_data_enqueue(mctx->dl, msg, mctx->chan_nr, mctx->link_id, - mctx->n201); -} - -static int lapdm_send_rej(struct lapdm_msg_ctx *mctx, uint8_t f_bit) -{ - uint8_t sapi = mctx->link_id & 7; - struct msgb *msg = msgb_alloc_headroom(23+10, 10, "LAPDm REJ"); - struct lapdm_entity *le = mctx->dl->entity; - - msg->l2h = msgb_put(msg, 3); - msg->l2h[0] = LAPDm_ADDR(LAPDm_LPD_NORMAL, sapi, le->cr.loc2rem.resp); - msg->l2h[1] = LAPDm_CTRL_S(mctx->dl->V_recv, LAPDm_S_REJ, f_bit); - msg->l2h[2] = LAPDm_LEN(0); - - return tx_ph_data_enqueue(mctx->dl, msg, mctx->chan_nr, mctx->link_id, - mctx->n201); -} - -/* Timer callback on T200 expiry */ -static void lapdm_t200_cb(void *data) -{ - struct lapdm_datalink *dl = data; - - LOGP(DLAPDM, LOGL_INFO, "lapdm_t200_cb(%p) state=%u\n", dl, dl->state); - - switch (dl->state) { - case LAPDm_STATE_SABM_SENT: - /* 5.4.1.3 */ - if (dl->retrans_ctr + 1 >= N200_EST_REL + 1) { - /* send RELEASE INDICATION to L3 */ - send_rll_simple(RSL_MT_REL_IND, &dl->mctx); - /* send MDL ERROR INIDCATION to L3 */ - rsl_rll_error(RLL_CAUSE_T200_EXPIRED, &dl->mctx); - /* flush tx buffers */ - lapdm_dl_flush_tx(dl); - /* go back to idle state */ - lapdm_dl_newstate(dl, LAPDm_STATE_IDLE); - /* NOTE: we must not change any other states or buffers - * and queues, since we may reconnect after handover - * failure. the buffered messages is replaced there */ - break; - } - /* retransmit SABM command */ - lapdm_send_resend(dl); - /* increment re-transmission counter */ - dl->retrans_ctr++; - /* restart T200 (PH-READY-TO-SEND) */ - osmo_timer_schedule(&dl->t200, T200); - break; - case LAPDm_STATE_DISC_SENT: - /* 5.4.4.3 */ - if (dl->retrans_ctr + 1 >= N200_EST_REL + 1) { - /* send RELEASE INDICATION to L3 */ - send_rll_simple(RSL_MT_REL_CONF, &dl->mctx); - /* send MDL ERROR INIDCATION to L3 */ - rsl_rll_error(RLL_CAUSE_T200_EXPIRED, &dl->mctx); - /* flush buffers */ - lapdm_dl_flush_tx(dl); - lapdm_dl_flush_send(dl); - /* go back to idle state */ - lapdm_dl_newstate(dl, LAPDm_STATE_IDLE); - /* NOTE: we must not change any other states or buffers - * and queues, since we may reconnect after handover - * failure. the buffered messages is replaced there */ - break; - } - /* retransmit DISC command */ - lapdm_send_resend(dl); - /* increment re-transmission counter */ - dl->retrans_ctr++; - /* restart T200 (PH-READY-TO-SEND) */ - osmo_timer_schedule(&dl->t200, T200); - break; - case LAPDm_STATE_MF_EST: - /* 5.5.7 */ - dl->retrans_ctr = 0; - lapdm_dl_newstate(dl, LAPDm_STATE_TIMER_RECOV); - /* fall through */ - case LAPDm_STATE_TIMER_RECOV: - dl->retrans_ctr++; - if (dl->retrans_ctr < N200) { - /* retransmit I frame (V_s-1) with P=1, if any */ - if (dl->tx_length[sub_mod8(dl->V_send, 1)]) { - struct msgb *msg; - int length; - - LOGP(DLAPDM, LOGL_INFO, "retransmit last frame " - "V(S)=%d\n", sub_mod8(dl->V_send, 1)); - /* Create I frame (segment) from tx_hist */ - length = dl->tx_length[sub_mod8(dl->V_send, 1)]; - msg = msgb_alloc_headroom(23+10, 10, "LAPDm I"); - msg->l2h = msgb_put(msg, length); - memcpy(msg->l2h, - dl->tx_hist[sub_mod8(dl->V_send, 1)], - length); - msg->l2h[1] = LAPDm_CTRL_I(dl->V_recv, - sub_mod8(dl->V_send, 1), 1); /* P=1 */ - tx_ph_data_enqueue(dl, msg, dl->mctx.chan_nr, - dl->mctx.link_id, dl->mctx.n201); - } else { - /* OR send appropriate supervision frame with P=1 */ - if (!dl->own_busy && !dl->seq_err_cond) { - lapdm_send_rr(&dl->mctx, 1); - /* NOTE: In case of sequence error - * condition, the REJ frame has been - * transmitted when entering the - * condition, so it has not be done - * here - */ - } else if (dl->own_busy) { - lapdm_send_rnr(&dl->mctx, 1); - } else { - LOGP(DLAPDM, LOGL_INFO, "unhandled, " - "pls. fix\n"); - } - } - /* restart T200 (PH-READY-TO-SEND) */ - osmo_timer_schedule(&dl->t200, T200); - } else { - /* send MDL ERROR INIDCATION to L3 */ - rsl_rll_error(RLL_CAUSE_T200_EXPIRED, &dl->mctx); - } - break; - default: - LOGP(DLAPDM, LOGL_INFO, "T200 expired in unexpected " - "dl->state %u\n", dl->state); - } -} - -/* 5.5.3.1: Common function to acknowlege frames up to the given N(R) value */ -static void lapdm_acknowledge(struct lapdm_msg_ctx *mctx) -{ - struct lapdm_datalink *dl = mctx->dl; - uint8_t nr = LAPDm_CTRL_Nr(mctx->ctrl); - int s = 0, rej = 0, t200_reset = 0; - int i; - - /* supervisory frame ? */ - if (LAPDm_CTRL_is_S(mctx->ctrl)) - s = 1; - /* REJ frame ? */ - if (s && LAPDm_CTRL_S_BITS(mctx->ctrl) == LAPDm_S_REJ) - rej = 1; - - /* Flush all transmit buffers of acknowledged frames */ - for (i = dl->V_ack; i != nr; i = inc_mod8(i)) { - if (dl->tx_length[i]) { - dl->tx_length[i] = 0; - LOGP(DLAPDM, LOGL_INFO, "ack frame %d\n", i); - } - } - - if (dl->state != LAPDm_STATE_TIMER_RECOV) { - /* When not in the timer recovery condition, the data - * link layer entity shall reset the timer T200 on - * receipt of a valid I frame with N(R) higher than V(A), - * or an REJ with an N(R) equal to V(A). */ - if ((!rej && nr != dl->V_ack) - || (rej && nr == dl->V_ack)) { - LOGP(DLAPDM, LOGL_INFO, "reset t200\n"); - t200_reset = 1; - osmo_timer_del(&dl->t200); - /* 5.5.3.1 Note 1 + 2 imply timer recovery cond. */ - } - /* 5.7.4: N(R) sequence error - * N(R) is called valid, if and only if - * (N(R)-V(A)) mod 8 <= (V(S)-V(A)) mod 8. - */ - if (sub_mod8(nr, dl->V_ack) > sub_mod8(dl->V_send, dl->V_ack)) { - LOGP(DLAPDM, LOGL_NOTICE, "N(R) sequence error\n"); - rsl_rll_error(RLL_CAUSE_SEQ_ERR, mctx); - } - } - - /* V(A) shall be set to the value of N(R) */ - dl->V_ack = nr; - - /* If T200 has been reset by the receipt of an I, RR or RNR frame, - * and if there are outstanding I frames, restart T200 */ - if (t200_reset && !rej) { - if (dl->tx_length[dl->V_send - 1]) { - LOGP(DLAPDM, LOGL_INFO, "start T200, due to unacked I " - "frame(s)\n"); - osmo_timer_schedule(&dl->t200, T200); - } - } -} - -/* L1 -> L2 */ - -/* Receive a LAPDm U (Unnumbered) message from L1 */ -static int lapdm_rx_u(struct msgb *msg, struct lapdm_msg_ctx *mctx) -{ - struct lapdm_datalink *dl = mctx->dl; - struct lapdm_entity *le = dl->entity; - uint8_t length; - int rc; - int rsl_msg; - - switch (LAPDm_CTRL_U_BITS(mctx->ctrl)) { - case LAPDm_U_SABM: - rsl_msg = RSL_MT_EST_IND; - - LOGP(DLAPDM, LOGL_INFO, "SABM received\n"); - /* 5.7.1 */ - dl->seq_err_cond = 0; - /* G.2.2 Wrong value of the C/R bit */ - if (LAPDm_ADDR_CR(mctx->addr) == le->cr.rem2loc.resp) { - LOGP(DLAPDM, LOGL_NOTICE, "SABM response error\n"); - msgb_free(msg); - rsl_rll_error(RLL_CAUSE_FRM_UNIMPL, mctx); - return -EINVAL; - } - - length = msg->l2h[2] >> 2; - /* G.4.5 If SABM is received with L>N201 or with M bit - * set, AN MDL-ERROR-INDICATION is sent to MM. - */ - if ((msg->l2h[2] & LAPDm_MORE) || length + 3 > mctx->n201) { - LOGP(DLAPDM, LOGL_NOTICE, "SABM too large error\n"); - msgb_free(msg); - rsl_rll_error(RLL_CAUSE_UFRM_INC_PARAM, mctx); - return -EIO; - } - - /* Must be Format B */ - rc = check_length_ind(mctx, msg->l2h[2]); - if (rc < 0) { - msgb_free(msg); - return rc; - } - switch (dl->state) { - case LAPDm_STATE_IDLE: - /* Set chan_nr and link_id for established connection */ - memset(&dl->mctx, 0, sizeof(dl->mctx)); - dl->mctx.dl = dl; - dl->mctx.chan_nr = mctx->chan_nr; - dl->mctx.link_id = mctx->link_id; - dl->mctx.n201 = mctx->n201; - break; - case LAPDm_STATE_MF_EST: - if (length == 0) { - rsl_msg = RSL_MT_EST_CONF; - break; - } - LOGP(DLAPDM, LOGL_INFO, "SABM command, multiple " - "frame established state\n"); - /* check for contention resoultion */ - if (dl->tx_hist[0][2] >> 2) { - LOGP(DLAPDM, LOGL_NOTICE, "SABM not allowed " - "during contention resolution\n"); - rsl_rll_error(RLL_CAUSE_SABM_INFO_NOTALL, mctx); - } - msgb_free(msg); - return 0; - case LAPDm_STATE_DISC_SENT: - /* 5.4.6.2 send DM with F=P */ - lapdm_send_dm(mctx); - /* reset Timer T200 */ - osmo_timer_del(&dl->t200); - msgb_free(msg); - return send_rll_simple(RSL_MT_REL_CONF, mctx); - default: - lapdm_send_ua(mctx, length, msg->l2h + 3); - msgb_free(msg); - return 0; - } - /* send UA response */ - lapdm_send_ua(mctx, length, msg->l2h + 3); - /* set Vs, Vr and Va to 0 */ - dl->V_send = dl->V_recv = dl->V_ack = 0; - /* clear tx_hist */ - dl->tx_length[0] = 0; - /* enter multiple-frame-established state */ - lapdm_dl_newstate(dl, LAPDm_STATE_MF_EST); - /* send notification to L3 */ - if (length == 0) { - /* 5.4.1.2 Normal establishment procedures */ - rc = send_rll_simple(rsl_msg, mctx); - msgb_free(msg); - } else { - /* 5.4.1.4 Contention resolution establishment */ - msg->l3h = msg->l2h + 3; - msgb_pull_l2h(msg); - rc = send_rslms_rll_l3(rsl_msg, mctx, msg); - } - break; - case LAPDm_U_DM: - LOGP(DLAPDM, LOGL_INFO, "DM received\n"); - /* G.2.2 Wrong value of the C/R bit */ - if (LAPDm_ADDR_CR(mctx->addr) == le->cr.rem2loc.cmd) { - LOGP(DLAPDM, LOGL_NOTICE, "DM command error\n"); - msgb_free(msg); - rsl_rll_error(RLL_CAUSE_FRM_UNIMPL, mctx); - return -EINVAL; - } - if (!LAPDm_CTRL_PF_BIT(mctx->ctrl)) { - /* 5.4.1.2 DM responses with the F bit set to "0" - * shall be ignored. - */ - msgb_free(msg); - return 0; - } - switch (dl->state) { - case LAPDm_STATE_SABM_SENT: - break; - case LAPDm_STATE_MF_EST: - if (LAPDm_CTRL_PF_BIT(mctx->ctrl) == 1) { - LOGP(DLAPDM, LOGL_INFO, "unsolicited DM " - "response\n"); - rsl_rll_error(RLL_CAUSE_UNSOL_DM_RESP, mctx); - } else { - LOGP(DLAPDM, LOGL_INFO, "unsolicited DM " - "response, multiple frame established " - "state\n"); - rsl_rll_error(RLL_CAUSE_UNSOL_DM_RESP_MF, mctx); - } - msgb_free(msg); - return 0; - case LAPDm_STATE_TIMER_RECOV: - /* DM is normal in case PF = 1 */ - if (LAPDm_CTRL_PF_BIT(mctx->ctrl) == 0) { - LOGP(DLAPDM, LOGL_INFO, "unsolicited DM " - "response, multiple frame established " - "state\n"); - rsl_rll_error(RLL_CAUSE_UNSOL_DM_RESP_MF, mctx); - msgb_free(msg); - return 0; - } - break; - case LAPDm_STATE_DISC_SENT: - /* reset Timer T200 */ - osmo_timer_del(&dl->t200); - /* go to idle state */ - lapdm_dl_newstate(dl, LAPDm_STATE_IDLE); - rc = send_rll_simple(RSL_MT_REL_CONF, mctx); - msgb_free(msg); - return 0; - case LAPDm_STATE_IDLE: - /* 5.4.5 all other frame types shall be discarded */ - default: - LOGP(DLAPDM, LOGL_INFO, "unsolicited DM response! " - "(discarding)\n"); - msgb_free(msg); - return 0; - } - /* reset T200 */ - osmo_timer_del(&dl->t200); - rc = send_rll_simple(RSL_MT_REL_IND, mctx); - msgb_free(msg); - break; - case LAPDm_U_UI: - LOGP(DLAPDM, LOGL_INFO, "UI received\n"); - /* G.2.2 Wrong value of the C/R bit */ - if (LAPDm_ADDR_CR(mctx->addr) == le->cr.rem2loc.resp) { - LOGP(DLAPDM, LOGL_NOTICE, "UI indicates response " - "error\n"); - msgb_free(msg); - rsl_rll_error(RLL_CAUSE_FRM_UNIMPL, mctx); - return -EINVAL; - } - - length = msg->l2h[2] >> 2; - /* FIXME: G.4.5 If UI is received with L>N201 or with M bit - * set, AN MDL-ERROR-INDICATION is sent to MM. - */ - - if (mctx->lapdm_fmt == LAPDm_FMT_B4) { - length = N201_B4; - msg->l3h = msg->l2h + 2; - } else { - rc = check_length_ind(mctx, msg->l2h[2]); - if (rc < 0) { - msgb_free(msg); - return rc; - } - length = msg->l2h[2] >> 2; - msg->l3h = msg->l2h + 3; - } - /* do some length checks */ - if (length == 0) { - /* 5.3.3 UI frames received with the length indicator - * set to "0" shall be ignored - */ - LOGP(DLAPDM, LOGL_INFO, "length=0 (discarding)\n"); - msgb_free(msg); - return 0; - } - switch (LAPDm_ADDR_SAPI(mctx->addr)) { - case LAPDm_SAPI_NORMAL: - case LAPDm_SAPI_SMS: - break; - default: - /* 5.3.3 UI frames with invalid SAPI values shall be - * discarded - */ - LOGP(DLAPDM, LOGL_INFO, "sapi=%u (discarding)\n", - LAPDm_ADDR_SAPI(mctx->addr)); - msgb_free(msg); - return 0; - } - msgb_pull_l2h(msg); - rc = send_rslms_rll_l3_ui(mctx, msg); - break; - case LAPDm_U_DISC: - rsl_msg = RSL_MT_REL_IND; - - LOGP(DLAPDM, LOGL_INFO, "DISC received\n"); - /* flush buffers */ - lapdm_dl_flush_tx(dl); - lapdm_dl_flush_send(dl); - /* 5.7.1 */ - dl->seq_err_cond = 0; - /* G.2.2 Wrong value of the C/R bit */ - if (LAPDm_ADDR_CR(mctx->addr) == le->cr.rem2loc.resp) { - LOGP(DLAPDM, LOGL_NOTICE, "DISC response error\n"); - msgb_free(msg); - rsl_rll_error(RLL_CAUSE_FRM_UNIMPL, mctx); - return -EINVAL; - } - length = msg->l2h[2] >> 2; - if (length > 0 || msg->l2h[2] & 0x02) { - /* G.4.4 If a DISC or DM frame is received with L>0 or - * with the M bit set to "1", an MDL-ERROR-INDICATION - * primitive with cause "U frame with incorrect - * parameters" is sent to the mobile management entity. - */ - LOGP(DLAPDM, LOGL_NOTICE, - "U frame iwth incorrect parameters "); - msgb_free(msg); - rsl_rll_error(RLL_CAUSE_UFRM_INC_PARAM, mctx); - return -EIO; - } - switch (dl->state) { - case LAPDm_STATE_IDLE: - LOGP(DLAPDM, LOGL_INFO, "DISC in idle state\n"); - /* send DM with F=P */ - msgb_free(msg); - return lapdm_send_dm(mctx); - case LAPDm_STATE_SABM_SENT: - LOGP(DLAPDM, LOGL_INFO, "DISC in SABM state\n"); - /* 5.4.6.2 send DM with F=P */ - lapdm_send_dm(mctx); - /* reset Timer T200 */ - osmo_timer_del(&dl->t200); - msgb_free(msg); - return send_rll_simple(RSL_MT_REL_IND, mctx); - case LAPDm_STATE_MF_EST: - case LAPDm_STATE_TIMER_RECOV: - LOGP(DLAPDM, LOGL_INFO, "DISC in est state\n"); - break; - case LAPDm_STATE_DISC_SENT: - LOGP(DLAPDM, LOGL_INFO, "DISC in disc state\n"); - rsl_msg = RSL_MT_REL_CONF; - break; - default: - lapdm_send_ua(mctx, length, msg->l2h + 3); - msgb_free(msg); - return 0; - } - /* send UA response */ - lapdm_send_ua(mctx, length, msg->l2h + 3); - /* reset Timer T200 */ - osmo_timer_del(&dl->t200); - /* enter idle state */ - lapdm_dl_newstate(dl, LAPDm_STATE_IDLE); - /* send notification to L3 */ - rc = send_rll_simple(rsl_msg, mctx); - msgb_free(msg); - break; - case LAPDm_U_UA: - LOGP(DLAPDM, LOGL_INFO, "UA received\n"); - /* G.2.2 Wrong value of the C/R bit */ - if (LAPDm_ADDR_CR(mctx->addr) == le->cr.rem2loc.cmd) { - LOGP(DLAPDM, LOGL_NOTICE, "UA indicates command " - "error\n"); - msgb_free(msg); - rsl_rll_error(RLL_CAUSE_FRM_UNIMPL, mctx); - return -EINVAL; - } - - length = msg->l2h[2] >> 2; - /* G.4.5 If UA is received with L>N201 or with M bit - * set, AN MDL-ERROR-INDICATION is sent to MM. - */ - if ((msg->l2h[2] & LAPDm_MORE) || length + 3 > mctx->n201) { - LOGP(DLAPDM, LOGL_NOTICE, "UA too large error\n"); - msgb_free(msg); - rsl_rll_error(RLL_CAUSE_UFRM_INC_PARAM, mctx); - return -EIO; - } - - if (!LAPDm_CTRL_PF_BIT(mctx->ctrl)) { - /* 5.4.1.2 A UA response with the F bit set to "0" - * shall be ignored. - */ - LOGP(DLAPDM, LOGL_INFO, "F=0 (discarding)\n"); - msgb_free(msg); - return 0; - } - switch (dl->state) { - case LAPDm_STATE_SABM_SENT: - break; - case LAPDm_STATE_MF_EST: - case LAPDm_STATE_TIMER_RECOV: - LOGP(DLAPDM, LOGL_INFO, "unsolicited UA response! " - "(discarding)\n"); - rsl_rll_error(RLL_CAUSE_UNSOL_UA_RESP, mctx); - msgb_free(msg); - return 0; - case LAPDm_STATE_DISC_SENT: - LOGP(DLAPDM, LOGL_INFO, "UA in disconnect state\n"); - /* reset Timer T200 */ - osmo_timer_del(&dl->t200); - /* go to idle state */ - lapdm_dl_newstate(dl, LAPDm_STATE_IDLE); - rc = send_rll_simple(RSL_MT_REL_CONF, mctx); - msgb_free(msg); - return 0; - case LAPDm_STATE_IDLE: - /* 5.4.5 all other frame types shall be discarded */ - default: - LOGP(DLAPDM, LOGL_INFO, "unsolicited UA response! " - "(discarding)\n"); - msgb_free(msg); - return 0; - } - LOGP(DLAPDM, LOGL_INFO, "UA in SABM state\n"); - /* reset Timer T200 */ - osmo_timer_del(&dl->t200); - /* compare UA with SABME if contention resolution is applied */ - if (dl->tx_hist[0][2] >> 2) { - rc = check_length_ind(mctx, msg->l2h[2]); - if (rc < 0) { - rc = send_rll_simple(RSL_MT_REL_IND, mctx); - msgb_free(msg); - /* go to idle state */ - lapdm_dl_newstate(dl, LAPDm_STATE_IDLE); - return 0; - } - length = msg->l2h[2] >> 2; - if (length != (dl->tx_hist[0][2] >> 2) - || !!memcmp(dl->tx_hist[0] + 3, msg->l2h + 3, - length)) { - LOGP(DLAPDM, LOGL_INFO, "**** UA response " - "mismatches ****\n"); - rc = send_rll_simple(RSL_MT_REL_IND, mctx); - msgb_free(msg); - /* go to idle state */ - lapdm_dl_newstate(dl, LAPDm_STATE_IDLE); - return 0; - } - } - /* set Vs, Vr and Va to 0 */ - dl->V_send = dl->V_recv = dl->V_ack = 0; - /* clear tx_hist */ - dl->tx_length[0] = 0; - /* enter multiple-frame-established state */ - lapdm_dl_newstate(dl, LAPDm_STATE_MF_EST); - /* send outstanding frames, if any (resume / reconnect) */ - rslms_send_i(mctx, __LINE__); - /* send notification to L3 */ - rc = send_rll_simple(RSL_MT_EST_CONF, mctx); - msgb_free(msg); - break; - default: - /* G.3.1 */ - LOGP(DLAPDM, LOGL_NOTICE, "Unnumbered frame not allowed.\n"); - msgb_free(msg); - rsl_rll_error(RLL_CAUSE_FRM_UNIMPL, mctx); - return -EINVAL; - } - return rc; -} - -/* Receive a LAPDm S (Supervisory) message from L1 */ -static int lapdm_rx_s(struct msgb *msg, struct lapdm_msg_ctx *mctx) -{ - struct lapdm_datalink *dl = mctx->dl; - struct lapdm_entity *le = dl->entity; - uint8_t length; - - length = msg->l2h[2] >> 2; - if (length > 0 || msg->l2h[2] & 0x02) { - /* G.4.3 If a supervisory frame is received with L>0 or - * with the M bit set to "1", an MDL-ERROR-INDICATION - * primitive with cause "S frame with incorrect - * parameters" is sent to the mobile management entity. */ - LOGP(DLAPDM, LOGL_NOTICE, - "S frame with incorrect parameters\n"); - msgb_free(msg); - rsl_rll_error(RLL_CAUSE_SFRM_INC_PARAM, mctx); - return -EIO; - } - - if (LAPDm_ADDR_CR(mctx->addr) == le->cr.rem2loc.resp - && LAPDm_CTRL_PF_BIT(mctx->ctrl) - && dl->state != LAPDm_STATE_TIMER_RECOV) { - /* 5.4.2.2: Inidcate error on supervisory reponse F=1 */ - LOGP(DLAPDM, LOGL_NOTICE, "S frame response with F=1 error\n"); - rsl_rll_error(RLL_CAUSE_UNSOL_SPRV_RESP, mctx); - } - - switch (dl->state) { - case LAPDm_STATE_IDLE: - /* if P=1, respond DM with F=1 (5.2.2) */ - /* 5.4.5 all other frame types shall be discarded */ - if (LAPDm_CTRL_PF_BIT(mctx->ctrl)) - lapdm_send_dm(mctx); /* F=P */ - /* fall though */ - case LAPDm_STATE_SABM_SENT: - case LAPDm_STATE_DISC_SENT: - LOGP(DLAPDM, LOGL_NOTICE, "S frame ignored in this state\n"); - msgb_free(msg); - return 0; - } - switch (LAPDm_CTRL_S_BITS(mctx->ctrl)) { - case LAPDm_S_RR: - LOGP(DLAPDM, LOGL_INFO, "RR received\n"); - /* 5.5.3.1: Acknowlege all tx frames up the the N(R)-1 */ - lapdm_acknowledge(mctx); - - /* 5.5.3.2 */ - if (LAPDm_ADDR_CR(mctx->addr) == le->cr.rem2loc.cmd - && LAPDm_CTRL_PF_BIT(mctx->ctrl)) { - if (!dl->own_busy && !dl->seq_err_cond) { - LOGP(DLAPDM, LOGL_NOTICE, "RR frame command " - "with polling bit set and we are not " - "busy, so we reply with RR frame\n"); - lapdm_send_rr(mctx, 1); - /* NOTE: In case of sequence error condition, - * the REJ frame has been transmitted when - * entering the condition, so it has not be - * done here - */ - } else if (dl->own_busy) { - LOGP(DLAPDM, LOGL_NOTICE, "RR frame command " - "with polling bit set and we are busy, " - "so we reply with RR frame\n"); - lapdm_send_rnr(mctx, 1); - } - } else if (LAPDm_ADDR_CR(mctx->addr) == le->cr.rem2loc.resp - && LAPDm_CTRL_PF_BIT(mctx->ctrl) - && dl->state == LAPDm_STATE_TIMER_RECOV) { - LOGP(DLAPDM, LOGL_INFO, "RR response with F==1, " - "and we are in timer recovery state, so " - "we leave that state\n"); - /* V(S) to the N(R) in the RR frame */ - dl->V_send = LAPDm_CTRL_Nr(mctx->ctrl); - /* reset Timer T200 */ - osmo_timer_del(&dl->t200); - /* 5.5.7 Clear timer recovery condition */ - lapdm_dl_newstate(dl, LAPDm_STATE_MF_EST); - } - /* Send message, if possible due to acknowledged data */ - rslms_send_i(mctx, __LINE__); - - break; - case LAPDm_S_RNR: - LOGP(DLAPDM, LOGL_INFO, "RNR received\n"); - /* 5.5.3.1: Acknowlege all tx frames up the the N(R)-1 */ - lapdm_acknowledge(mctx); - - /* 5.5.5 */ - /* Set peer receiver busy condition */ - dl->peer_busy = 1; - - if (LAPDm_CTRL_PF_BIT(mctx->ctrl)) { - if (LAPDm_ADDR_CR(mctx->addr) == le->cr.rem2loc.cmd) { - if (!dl->own_busy) { - LOGP(DLAPDM, LOGL_INFO, "RNR poll " - "command and we are not busy, " - "so we reply with RR final " - "response\n"); - /* Send RR with F=1 */ - lapdm_send_rr(mctx, 1); - } else { - LOGP(DLAPDM, LOGL_INFO, "RNR poll " - "command and we are busy, so " - "we reply with RNR final " - "response\n"); - /* Send RNR with F=1 */ - lapdm_send_rnr(mctx, 1); - } - } else if (dl->state == LAPDm_STATE_TIMER_RECOV) { - LOGP(DLAPDM, LOGL_INFO, "RNR poll response " - "and we in timer recovery state, so " - "we leave that state\n"); - /* 5.5.7 Clear timer recovery condition */ - lapdm_dl_newstate(dl, LAPDm_STATE_MF_EST); - /* V(S) to the N(R) in the RNR frame */ - dl->V_send = LAPDm_CTRL_Nr(mctx->ctrl); - } - } else - LOGP(DLAPDM, LOGL_INFO, "RNR not polling/final state " - "received\n"); - - /* Send message, if possible due to acknowledged data */ - rslms_send_i(mctx, __LINE__); - - break; - case LAPDm_S_REJ: - LOGP(DLAPDM, LOGL_INFO, "REJ received\n"); - /* 5.5.3.1: Acknowlege all tx frames up the the N(R)-1 */ - lapdm_acknowledge(mctx); - - /* 5.5.4.1 */ - if (dl->state != LAPDm_STATE_TIMER_RECOV) { - /* Clear an existing peer receiver busy condition */ - dl->peer_busy = 0; - /* V(S) and V(A) to the N(R) in the REJ frame */ - dl->V_send = dl->V_ack = LAPDm_CTRL_Nr(mctx->ctrl); - /* reset Timer T200 */ - osmo_timer_del(&dl->t200); - /* 5.5.3.2 */ - if (LAPDm_ADDR_CR(mctx->addr) == le->cr.rem2loc.cmd - && LAPDm_CTRL_PF_BIT(mctx->ctrl)) { - if (!dl->own_busy && !dl->seq_err_cond) { - LOGP(DLAPDM, LOGL_INFO, "REJ poll " - "command not in timer recovery " - "state and not in own busy " - "condition received, so we " - "respond with RR final " - "response\n"); - lapdm_send_rr(mctx, 1); - /* NOTE: In case of sequence error - * condition, the REJ frame has been - * transmitted when entering the - * condition, so it has not be done - * here - */ - } else if (dl->own_busy) { - LOGP(DLAPDM, LOGL_INFO, "REJ poll " - "command not in timer recovery " - "state and in own busy " - "condition received, so we " - "respond with RNR final " - "response\n"); - lapdm_send_rnr(mctx, 1); - } - } else - LOGP(DLAPDM, LOGL_INFO, "REJ response or not " - "polling command not in timer recovery " - "state received\n"); - /* send MDL ERROR INIDCATION to L3 */ - if (LAPDm_ADDR_CR(mctx->addr) == le->cr.rem2loc.resp - && LAPDm_CTRL_PF_BIT(mctx->ctrl)) { - rsl_rll_error(RLL_CAUSE_UNSOL_SPRV_RESP, mctx); - } - - } else if (LAPDm_ADDR_CR(mctx->addr) == le->cr.rem2loc.resp - && LAPDm_CTRL_PF_BIT(mctx->ctrl)) { - LOGP(DLAPDM, LOGL_INFO, "REJ poll response in timer " - "recovery state received\n"); - /* Clear an existing peer receiver busy condition */ - dl->peer_busy = 0; - /* 5.5.7 Clear timer recovery condition */ - lapdm_dl_newstate(dl, LAPDm_STATE_MF_EST); - /* V(S) and V(A) to the N(R) in the REJ frame */ - dl->V_send = dl->V_ack = LAPDm_CTRL_Nr(mctx->ctrl); - /* reset Timer T200 */ - osmo_timer_del(&dl->t200); - } else { - /* Clear an existing peer receiver busy condition */ - dl->peer_busy = 0; - /* V(S) and V(A) to the N(R) in the REJ frame */ - dl->V_send = dl->V_ack = LAPDm_CTRL_Nr(mctx->ctrl); - /* 5.5.3.2 */ - if (LAPDm_ADDR_CR(mctx->addr) == le->cr.rem2loc.cmd - && LAPDm_CTRL_PF_BIT(mctx->ctrl)) { - if (!dl->own_busy && !dl->seq_err_cond) { - LOGP(DLAPDM, LOGL_INFO, "REJ poll " - "command in timer recovery " - "state and not in own busy " - "condition received, so we " - "respond with RR final " - "response\n"); - lapdm_send_rr(mctx, 1); - /* NOTE: In case of sequence error - * condition, the REJ frame has been - * transmitted when entering the - * condition, so it has not be done - * here - */ - } else if (dl->own_busy) { - LOGP(DLAPDM, LOGL_INFO, "REJ poll " - "command in timer recovery " - "state and in own busy " - "condition received, so we " - "respond with RNR final " - "response\n"); - lapdm_send_rnr(mctx, 1); - } - } else - LOGP(DLAPDM, LOGL_INFO, "REJ response or not " - "polling command in timer recovery " - "state received\n"); - } - - /* FIXME: 5.5.4.2 2) */ - - /* Send message, if possible due to acknowledged data */ - rslms_send_i(mctx, __LINE__); - - break; - default: - /* G.3.1 */ - LOGP(DLAPDM, LOGL_NOTICE, "Supervisory frame not allowed.\n"); - msgb_free(msg); - rsl_rll_error(RLL_CAUSE_FRM_UNIMPL, mctx); - return -EINVAL; - } - msgb_free(msg); - return 0; -} - -/* Receive a LAPDm I (Information) message from L1 */ -static int lapdm_rx_i(struct msgb *msg, struct lapdm_msg_ctx *mctx) -{ - struct lapdm_datalink *dl = mctx->dl; - struct lapdm_entity *le = dl->entity; - //uint8_t nr = LAPDm_CTRL_Nr(mctx->ctrl); - uint8_t ns = LAPDm_CTRL_I_Ns(mctx->ctrl); - uint8_t length; - int rc; - - LOGP(DLAPDM, LOGL_NOTICE, "I received\n"); - - /* G.2.2 Wrong value of the C/R bit */ - if (LAPDm_ADDR_CR(mctx->addr) == le->cr.rem2loc.resp) { - LOGP(DLAPDM, LOGL_NOTICE, "I frame response not allowed\n"); - msgb_free(msg); - rsl_rll_error(RLL_CAUSE_FRM_UNIMPL, mctx); - return -EINVAL; - } - - length = msg->l2h[2] >> 2; - if (length == 0 || length + 3 > mctx->n201) { - /* G.4.2 If the length indicator of an I frame is set - * to a numerical value L>N201 or L=0, an MDL-ERROR-INDICATION - * primitive with cause "I frame with incorrect length" - * is sent to the mobile management entity. */ - LOGP(DLAPDM, LOGL_NOTICE, "I frame length not allowed\n"); - msgb_free(msg); - rsl_rll_error(RLL_CAUSE_IFRM_INC_LEN, mctx); - return -EIO; - } - - /* G.4.2 If the numerical value of L is Ll2h[2] & LAPDm_MORE) && length + 3 < mctx->n201) { - LOGP(DLAPDM, LOGL_NOTICE, "I frame with M bit too short\n"); - msgb_free(msg); - rsl_rll_error(RLL_CAUSE_IFRM_INC_MBITS, mctx); - return -EIO; - } - - switch (dl->state) { - case LAPDm_STATE_IDLE: - /* if P=1, respond DM with F=1 (5.2.2) */ - /* 5.4.5 all other frame types shall be discarded */ - if (LAPDm_CTRL_PF_BIT(mctx->ctrl)) - lapdm_send_dm(mctx); /* F=P */ - /* fall though */ - case LAPDm_STATE_SABM_SENT: - case LAPDm_STATE_DISC_SENT: - LOGP(DLAPDM, LOGL_NOTICE, "I frame ignored in this state\n"); - msgb_free(msg); - return 0; - } - - /* 5.7.1: N(s) sequence error */ - if (ns != dl->V_recv) { - LOGP(DLAPDM, LOGL_NOTICE, "N(S) sequence error: N(S)=%u, " - "V(R)=%u\n", ns, dl->V_recv); - /* discard data */ - msgb_free(msg); - if (!dl->seq_err_cond) { - /* FIXME: help me understand what exactly todo here - dl->seq_err_cond = 1; - */ - lapdm_send_rej(mctx, LAPDm_CTRL_PF_BIT(mctx->ctrl)); - } else { - } - return -EIO; - } - dl->seq_err_cond = 0; - - /* Increment receiver state */ - dl->V_recv = inc_mod8(dl->V_recv); - LOGP(DLAPDM, LOGL_NOTICE, "incrementing V(R) to %u\n", dl->V_recv); - - /* 5.5.3.1: Acknowlege all transmitted frames up the the N(R)-1 */ - lapdm_acknowledge(mctx); /* V(A) is also set here */ - - /* Only if we are not in own receiver busy condition */ - if (!dl->own_busy) { - /* if the frame carries a complete segment */ - if (!(msg->l2h[2] & LAPDm_MORE) - && !dl->rcv_buffer) { - LOGP(DLAPDM, LOGL_INFO, "message in single I frame\n"); - /* send a DATA INDICATION to L3 */ - msg->l3h = msg->l2h + 3; - msgb_pull_l2h(msg); - msg->len = length; - msg->tail = msg->data + length; - rc = send_rslms_rll_l3(RSL_MT_DATA_IND, mctx, msg); - } else { - /* create rcv_buffer */ - if (!dl->rcv_buffer) { - LOGP(DLAPDM, LOGL_INFO, "message in multiple I " - "frames (first message)\n"); - dl->rcv_buffer = msgb_alloc_headroom(200+56, 56, - "LAPDm RX"); - dl->rcv_buffer->l3h = dl->rcv_buffer->data; - } - /* concat. rcv_buffer */ - if (msgb_l3len(dl->rcv_buffer) + length > 200) { - LOGP(DLAPDM, LOGL_NOTICE, "Received frame " - "overflow!\n"); - } else { - memcpy(msgb_put(dl->rcv_buffer, length), - msg->l2h + 3, length); - } - /* if the last segment was received */ - if (!(msg->l2h[2] & LAPDm_MORE)) { - LOGP(DLAPDM, LOGL_INFO, "message in multiple I " - "frames (last message)\n"); - rc = send_rslms_rll_l3(RSL_MT_DATA_IND, mctx, - dl->rcv_buffer); - dl->rcv_buffer = NULL; - } else - LOGP(DLAPDM, LOGL_INFO, "message in multiple I " - "frames (next message)\n"); - msgb_free(msg); - - } - } else - LOGP(DLAPDM, LOGL_INFO, "I frame ignored during own receiver " - "busy condition\n"); - - /* Check for P bit */ - if (LAPDm_CTRL_PF_BIT(mctx->ctrl)) { - /* 5.5.2.1 */ - /* check if we are not in own receiver busy */ - if (!dl->own_busy) { - LOGP(DLAPDM, LOGL_INFO, "we are not busy, send RR\n"); - /* Send RR with F=1 */ - rc = lapdm_send_rr(mctx, 1); - } else { - LOGP(DLAPDM, LOGL_INFO, "we are busy, send RNR\n"); - /* Send RNR with F=1 */ - rc = lapdm_send_rnr(mctx, 1); - } - } else { - /* 5.5.2.2 */ - /* check if we are not in own receiver busy */ - if (!dl->own_busy) { - /* NOTE: V(R) is already set above */ - rc = rslms_send_i(mctx, __LINE__); - if (rc) { - LOGP(DLAPDM, LOGL_INFO, "we are not busy and " - "have no pending data, send RR\n"); - /* Send RR with F=0 */ - return lapdm_send_rr(mctx, 0); - } - /* all I or one RR is sent, we are done */ - return 0; - } else { - LOGP(DLAPDM, LOGL_INFO, "we are busy, send RNR\n"); - /* Send RNR with F=0 */ - rc = lapdm_send_rnr(mctx, 0); - } - } - - /* Send message, if possible due to acknowledged data */ - rslms_send_i(mctx, __LINE__); - - return rc; -} - -/* Receive a LAPDm message from L1 */ -static int lapdm_ph_data_ind(struct msgb *msg, struct lapdm_msg_ctx *mctx) -{ - int rc; - - /* G.2.3 EA bit set to "0" is not allowed in GSM */ - if (!LAPDm_ADDR_EA(mctx->addr)) { - LOGP(DLAPDM, LOGL_NOTICE, "EA bit 0 is not allowed in GSM\n"); - msgb_free(msg); - rsl_rll_error(RLL_CAUSE_FRM_UNIMPL, mctx); - return -EINVAL; - } - - if (LAPDm_CTRL_is_U(mctx->ctrl)) - rc = lapdm_rx_u(msg, mctx); - else if (LAPDm_CTRL_is_S(mctx->ctrl)) - rc = lapdm_rx_s(msg, mctx); - else if (LAPDm_CTRL_is_I(mctx->ctrl)) - rc = lapdm_rx_i(msg, mctx); - else { - LOGP(DLAPDM, LOGL_NOTICE, "unknown LAPDm format\n"); - msgb_free(msg); - rc = -EINVAL; - } - return rc; -} - -/* input into layer2 (from layer 1) */ -static int l2_ph_data_ind(struct msgb *msg, struct lapdm_entity *le, uint8_t chan_nr, uint8_t link_id) -{ - uint8_t cbits = chan_nr >> 3; - uint8_t sapi = link_id & 7; - struct lapdm_msg_ctx mctx; - int rc = 0; - - /* when we reach here, we have a msgb with l2h pointing to the raw - * 23byte mac block. The l1h has already been purged. */ - - mctx.dl = datalink_for_sapi(le, sapi); - mctx.chan_nr = chan_nr; - mctx.link_id = link_id; - mctx.addr = mctx.ctrl = 0; - - /* G.2.1 No action schall be taken on frames containing an unallocated - * SAPI. - */ - if (!mctx.dl) { - LOGP(DLAPDM, LOGL_NOTICE, "Received frame for unsupported " - "SAPI %d!\n", sapi); - return -EINVAL; - msgb_free(msg); - return -EIO; - } - - /* check for L1 chan_nr/link_id and determine LAPDm hdr format */ - if (cbits == 0x10 || cbits == 0x12) { - /* Format Bbis is used on BCCH and CCCH(PCH, NCH and AGCH) */ - mctx.lapdm_fmt = LAPDm_FMT_Bbis; - mctx.n201 = N201_Bbis; - } else { - if (mctx.link_id & 0x40) { - /* It was received from network on SACCH, thus - * lapdm_fmt must be B4 */ - mctx.lapdm_fmt = LAPDm_FMT_B4; - mctx.n201 = N201_B4; - LOGP(DLAPDM, LOGL_INFO, "fmt=B4\n"); - /* SACCH frames have a two-byte L1 header that - * OsmocomBB L1 doesn't strip */ - mctx.tx_power_ind = msg->l2h[0] & 0x1f; - mctx.ta_ind = msg->l2h[1]; - msgb_pull(msg, 2); - msg->l2h += 2; - } else { - mctx.lapdm_fmt = LAPDm_FMT_B; - LOGP(DLAPDM, LOGL_INFO, "fmt=B\n"); - mctx.n201 = 23; // FIXME: select correct size by chan. - } - } - - switch (mctx.lapdm_fmt) { - case LAPDm_FMT_A: - case LAPDm_FMT_B: - case LAPDm_FMT_B4: - mctx.addr = msg->l2h[0]; - if (!(mctx.addr & 0x01)) { - LOGP(DLAPDM, LOGL_ERROR, "we don't support " - "multibyte addresses (discarding)\n"); - msgb_free(msg); - return -EINVAL; - } - mctx.ctrl = msg->l2h[1]; - /* obtain SAPI from address field */ - mctx.link_id |= LAPDm_ADDR_SAPI(mctx.addr); - rc = lapdm_ph_data_ind(msg, &mctx); - break; - case LAPDm_FMT_Bter: - /* FIXME */ - msgb_free(msg); - break; - case LAPDm_FMT_Bbis: - /* directly pass up to layer3 */ - LOGP(DLAPDM, LOGL_INFO, "fmt=Bbis UI\n"); - msg->l3h = msg->l2h; - msgb_pull_l2h(msg); - rc = send_rslms_rll_l3(RSL_MT_UNIT_DATA_IND, &mctx, msg); - break; - default: - msgb_free(msg); - } - - return rc; -} - -/* input into layer2 (from layer 1) */ -static int l2_ph_rach_ind(struct lapdm_entity *le, uint8_t ra, uint32_t fn, uint8_t acc_delay) -{ - struct abis_rsl_cchan_hdr *ch; - struct gsm48_req_ref req_ref; - struct gsm_time gt; - struct msgb *msg = msgb_alloc_headroom(512, 64, "RSL CHAN RQD"); - - msg->l2h = msgb_push(msg, sizeof(*ch)); - ch = (struct abis_rsl_cchan_hdr *)msg->l2h; - rsl_init_cchan_hdr(ch, RSL_MT_CHAN_RQD); - ch->chan_nr = RSL_CHAN_RACH; - - /* generate a RSL CHANNEL REQUIRED message */ - gsm_fn2gsmtime(>, fn); - req_ref.ra = ra; - req_ref.t1 = gt.t1; /* FIXME: modulo? */ - req_ref.t2 = gt.t2; - req_ref.t3_low = gt.t3 & 7; - req_ref.t3_high = gt.t3 >> 3; - - msgb_tv_fixed_put(msg, RSL_IE_REQ_REFERENCE, 3, (uint8_t *) &req_ref); - msgb_tv_put(msg, RSL_IE_ACCESS_DELAY, acc_delay); - - return rslms_sendmsg(msg, le); -} - -static int l2_ph_chan_conf(struct msgb *msg, struct lapdm_entity *le, uint32_t frame_nr); - -int lapdm_phsap_up(struct osmo_prim_hdr *oph, struct lapdm_entity *le) -{ - struct osmo_phsap_prim *pp = (struct osmo_phsap_prim *) oph; - int rc = 0; - - if (oph->sap != SAP_GSM_PH) { - LOGP(DLAPDM, LOGL_ERROR, "primitive for unknown SAP %u\n", - oph->sap); - return -ENODEV; - } - - switch (oph->primitive) { - case PRIM_PH_DATA: - if (oph->operation != PRIM_OP_INDICATION) { - LOGP(DLAPDM, LOGL_ERROR, "PH_DATA is not INDICATION %u\n", - oph->operation); - return -ENODEV; - } - rc = l2_ph_data_ind(oph->msg, le, pp->u.data.chan_nr, - pp->u.data.link_id); - break; - case PRIM_PH_RTS: - if (oph->operation != PRIM_OP_INDICATION) { - LOGP(DLAPDM, LOGL_ERROR, "PH_RTS is not INDICATION %u\n", - oph->operation); - return -ENODEV; - } - rc = l2_ph_data_conf(oph->msg, le); - break; - case PRIM_PH_RACH: - switch (oph->operation) { - case PRIM_OP_INDICATION: - rc = l2_ph_rach_ind(le, pp->u.rach_ind.ra, pp->u.rach_ind.fn, - pp->u.rach_ind.acc_delay); - break; - case PRIM_OP_CONFIRM: - rc = l2_ph_chan_conf(oph->msg, le, pp->u.rach_ind.fn); - break; - default: - return -EIO; - } - break; - } - - return rc; -} - - -/* L3 -> L2 / RSLMS -> LAPDm */ - -/* L3 requests establishment of data link */ -static int rslms_rx_rll_est_req(struct msgb *msg, struct lapdm_datalink *dl) -{ - struct lapdm_entity *le = dl->entity; - struct abis_rsl_rll_hdr *rllh = msgb_l2(msg); - uint8_t chan_nr = rllh->chan_nr; - uint8_t link_id = rllh->link_id; - uint8_t sapi = rllh->link_id & 7; - struct tlv_parsed tv; - uint8_t length; - uint8_t n201 = 23; //FIXME - - /* Set chan_nr and link_id for established connection */ - memset(&dl->mctx, 0, sizeof(dl->mctx)); - dl->mctx.dl = dl; - dl->mctx.n201 = n201; - dl->mctx.chan_nr = chan_nr; - dl->mctx.link_id = link_id; - - rsl_tlv_parse(&tv, rllh->data, msgb_l2len(msg)-sizeof(*rllh)); - if (TLVP_PRESENT(&tv, RSL_IE_L3_INFO)) { - msg->l3h = TLVP_VAL(&tv, RSL_IE_L3_INFO); - /* contention resolution establishment procedure */ - if (sapi != 0) { - /* According to clause 6, the contention resolution - * procedure is only permitted with SAPI value 0 */ - LOGP(DLAPDM, LOGL_ERROR, "SAPI != 0 but contention" - "resolution (discarding)\n"); - msgb_free(msg); - return send_rll_simple(RSL_MT_REL_IND, &dl->mctx); - } - /* transmit a SABM command with the P bit set to "1". The SABM - * command shall contain the layer 3 message unit */ - length = TLVP_LEN(&tv, RSL_IE_L3_INFO); - LOGP(DLAPDM, LOGL_INFO, "perform establishment with content " - "(SABM)\n"); - } else { - /* normal establishment procedure */ - length = 0; - LOGP(DLAPDM, LOGL_INFO, "perform normal establishm. (SABM)\n"); - } - - /* check if the layer3 message length exceeds N201 */ - if (length + 3 > 21) { /* FIXME: do we know the channel N201? */ - LOGP(DLAPDM, LOGL_ERROR, "frame too large: %d > N201(%d) " - "(discarding)\n", length + 3, 21); - msgb_free(msg); - return send_rll_simple(RSL_MT_REL_IND, &dl->mctx); - } - - /* Flush send-queue */ - /* Clear send-buffer */ - lapdm_dl_flush_send(dl); - - /* Discard partly received L3 message */ - if (dl->rcv_buffer) { - msgb_free(dl->rcv_buffer); - dl->rcv_buffer = NULL; - } - - /* Remove RLL header from msgb */ - msgb_pull_l2h(msg); - - /* Push LAPDm header on msgb */ - msg->l2h = msgb_push(msg, 3); - msg->l2h[0] = LAPDm_ADDR(LAPDm_LPD_NORMAL, sapi, le->cr.loc2rem.cmd); - msg->l2h[1] = LAPDm_CTRL_U(LAPDm_U_SABM, 1); - msg->l2h[2] = LAPDm_LEN(length); - /* Transmit-buffer carries exactly one segment */ - memcpy(dl->tx_hist[0], msg->l2h, 3 + length); - dl->tx_length[0] = 3 + length; - /* set Vs to 0, because it is used as index when resending SABM */ - dl->V_send = 0; - - /* Set states */ - dl->own_busy = dl->peer_busy = 0; - dl->retrans_ctr = 0; - lapdm_dl_newstate(dl, LAPDm_STATE_SABM_SENT); - - /* Tramsmit and start T200 */ - osmo_timer_schedule(&dl->t200, T200); - return tx_ph_data_enqueue(dl, msg, chan_nr, link_id, n201); -} - -/* L3 requests transfer of unnumbered information */ -static int rslms_rx_rll_udata_req(struct msgb *msg, struct lapdm_datalink *dl) -{ - struct lapdm_entity *le = dl->entity; - struct abis_rsl_rll_hdr *rllh = msgb_l2(msg); - uint8_t chan_nr = rllh->chan_nr; - uint8_t link_id = rllh->link_id; - uint8_t sapi = link_id & 7; - struct tlv_parsed tv; - int length; - uint8_t n201 = 23; //FIXME - uint8_t ta = 0, tx_power = 0; - - /* check if the layer3 message length exceeds N201 */ - - rsl_tlv_parse(&tv, rllh->data, msgb_l2len(msg)-sizeof(*rllh)); - - if (TLVP_PRESENT(&tv, RSL_IE_TIMING_ADVANCE)) { - ta = *TLVP_VAL(&tv, RSL_IE_TIMING_ADVANCE); - } - if (TLVP_PRESENT(&tv, RSL_IE_MS_POWER)) { - tx_power = *TLVP_VAL(&tv, RSL_IE_MS_POWER); - } - if (!TLVP_PRESENT(&tv, RSL_IE_L3_INFO)) { - LOGP(DLAPDM, LOGL_ERROR, "unit data request without message " - "error\n"); - msgb_free(msg); - return -EINVAL; - } - msg->l3h = TLVP_VAL(&tv, RSL_IE_L3_INFO); - length = TLVP_LEN(&tv, RSL_IE_L3_INFO); - /* check if the layer3 message length exceeds N201 */ - if (length + 5 > 23) { /* FIXME: do we know the channel N201? */ - LOGP(DLAPDM, LOGL_ERROR, "frame too large: %d > N201(%d) " - "(discarding)\n", length + 5, 23); - msgb_free(msg); - return -EIO; - } - - LOGP(DLAPDM, LOGL_INFO, "sending unit data (tx_power=%d, ta=%d)\n", - tx_power, ta); - - /* Remove RLL header from msgb */ - msgb_pull_l2h(msg); - - /* Push L1 + LAPDm header on msgb */ - msg->l2h = msgb_push(msg, 2 + 3); - msg->l2h[0] = tx_power; - msg->l2h[1] = ta; - msg->l2h[2] = LAPDm_ADDR(LAPDm_LPD_NORMAL, sapi, le->cr.loc2rem.cmd); - msg->l2h[3] = LAPDm_CTRL_U(LAPDm_U_UI, 0); - msg->l2h[4] = LAPDm_LEN(length); - // FIXME: short L2 header support - - /* Tramsmit */ - return tx_ph_data_enqueue(dl, msg, chan_nr, link_id, n201); -} - -/* L3 requests transfer of acknowledged information */ -static int rslms_rx_rll_data_req(struct msgb *msg, struct lapdm_datalink *dl) -{ - struct abis_rsl_rll_hdr *rllh = msgb_l2(msg); - struct tlv_parsed tv; - - rsl_tlv_parse(&tv, rllh->data, msgb_l2len(msg)-sizeof(*rllh)); - if (!TLVP_PRESENT(&tv, RSL_IE_L3_INFO)) { - LOGP(DLAPDM, LOGL_ERROR, "data request without message " - "error\n"); - msgb_free(msg); - return -EINVAL; - } - msg->l3h = TLVP_VAL(&tv, RSL_IE_L3_INFO); - - LOGP(DLAPDM, LOGL_INFO, "writing message to send-queue\n"); - - /* Remove the RSL/RLL header */ - msgb_pull_l2h(msg); - - /* Write data into the send queue */ - msgb_enqueue(&dl->send_queue, msg); - - /* Send message, if possible */ - rslms_send_i(&dl->mctx, __LINE__); - return 0; -} - -/* Send next I frame from queued/buffered data */ -static int rslms_send_i(struct lapdm_msg_ctx *mctx, int line) -{ - struct lapdm_datalink *dl = mctx->dl; - struct lapdm_entity *le = dl->entity; - uint8_t chan_nr = mctx->chan_nr; - uint8_t link_id = mctx->link_id; - uint8_t sapi = link_id & 7; - int k = k_sapi[sapi]; - struct msgb *msg; - int length, left; - int rc = - 1; /* we sent nothing */ - - LOGP(DLAPDM, LOGL_INFO, "%s() called from line %d\n", __func__, line); - - next_frame: - - if (dl->peer_busy) { - LOGP(DLAPDM, LOGL_INFO, "peer busy, not sending\n"); - return rc; - } - - if (dl->state == LAPDm_STATE_TIMER_RECOV) { - LOGP(DLAPDM, LOGL_INFO, "timer recovery, not sending\n"); - return rc; - } - - /* If the send state variable V(S) is equal to V(A) plus k - * (where k is the maximum number of outstanding I frames - see - * subclause 5.8.4), the data link layer entity shall not transmit any - * new I frames, but shall retransmit an I frame as a result - * of the error recovery procedures as described in subclauses 5.5.4 and - * 5.5.7. */ - if (dl->V_send == add_mod8(dl->V_ack, k)) { - LOGP(DLAPDM, LOGL_INFO, "k frames outstanding, not sending " - "more (k=%u V(S)=%u V(A)=%u)\n", k, dl->V_send, - dl->V_ack); - return rc; - } - - /* if we have no tx_hist yet, we create it */ - if (!dl->tx_length[dl->V_send]) { - /* Get next message into send-buffer, if any */ - if (!dl->send_buffer) { - next_message: - dl->send_out = 0; - dl->send_buffer = msgb_dequeue(&dl->send_queue); - /* No more data to be sent */ - if (!dl->send_buffer) - return rc; - LOGP(DLAPDM, LOGL_INFO, "get message from " - "send-queue\n"); - } - - /* How much is left in the send-buffer? */ - left = msgb_l3len(dl->send_buffer) - dl->send_out; - /* Segment, if data exceeds N201 */ - length = left; - if (length > mctx->n201 - 3) - length = mctx->n201 - 3; - LOGP(DLAPDM, LOGL_INFO, "msg-len %d sent %d left %d N201 %d " - "length %d first byte %02x\n", - msgb_l3len(dl->send_buffer), dl->send_out, left, - mctx->n201, length, dl->send_buffer->l3h[0]); - /* If message in send-buffer is completely sent */ - if (left == 0) { - msgb_free(dl->send_buffer); - dl->send_buffer = NULL; - goto next_message; - } - - LOGP(DLAPDM, LOGL_INFO, "send I frame %sV(S)=%d\n", - (left > length) ? "segment " : "", dl->V_send); - - /* Create I frame (segment) and transmit-buffer content */ - msg = msgb_alloc_headroom(23+10, 10, "LAPDm I"); - msg->l2h = msgb_put(msg, 3 + length); - msg->l2h[0] = LAPDm_ADDR(LAPDm_LPD_NORMAL, sapi, le->cr.loc2rem.cmd); - msg->l2h[1] = LAPDm_CTRL_I(dl->V_recv, dl->V_send, 0); - msg->l2h[2] = LAPDm_LEN(length); - if (left > length) - msg->l2h[2] |= LAPDm_MORE; - memcpy(msg->l2h + 3, dl->send_buffer->l3h + dl->send_out, - length); - memcpy(dl->tx_hist[dl->V_send], msg->l2h, 3 + length); - dl->tx_length[dl->V_send] = 3 + length; - /* Add length to track how much is already in the tx buffer */ - dl->send_out += length; - } else { - LOGP(DLAPDM, LOGL_INFO, "resend I frame from tx buffer " - "V(S)=%d\n", dl->V_send); - - /* Create I frame (segment) from tx_hist */ - length = dl->tx_length[dl->V_send]; - msg = msgb_alloc_headroom(23+10, 10, "LAPDm I"); - msg->l2h = msgb_put(msg, length); - memcpy(msg->l2h, dl->tx_hist[dl->V_send], length); - msg->l2h[1] = LAPDm_CTRL_I(dl->V_recv, dl->V_send, 0); - } - - /* The value of the send state variable V(S) shall be incremented by 1 - * at the end of the transmission of the I frame */ - dl->V_send = inc_mod8(dl->V_send); - - /* If timer T200 is not running at the time right before transmitting a - * frame, when the PH-READY-TO-SEND primitive is received from the - * physical layer., it shall be set. */ - if (!osmo_timer_pending(&dl->t200)) - osmo_timer_schedule(&dl->t200, T200); - - tx_ph_data_enqueue(dl, msg, chan_nr, link_id, mctx->n201); - - rc = 0; /* we sent something */ - goto next_frame; -} - -/* L3 requests suspension of data link */ -static int rslms_rx_rll_susp_req(struct msgb *msg, struct lapdm_datalink *dl) -{ - struct abis_rsl_rll_hdr *rllh = msgb_l2(msg); - uint8_t sapi = rllh->link_id & 7; - - if (sapi != 0) { - LOGP(DLAPDM, LOGL_ERROR, "SAPI != 0 while suspending\n"); - msgb_free(msg); - return -EINVAL; - } - - LOGP(DLAPDM, LOGL_INFO, "perform suspension\n"); - - /* put back the send-buffer to the send-queue (first position) */ - if (dl->send_buffer) { - LOGP(DLAPDM, LOGL_INFO, "put frame in sendbuffer back to " - "queue\n"); - llist_add(&dl->send_buffer->list, &dl->send_queue); - dl->send_buffer = NULL; - } else - LOGP(DLAPDM, LOGL_INFO, "no frame in sendbuffer\n"); - - /* Clear transmit buffer, but keep send buffer */ - lapdm_dl_flush_tx(dl); - - msgb_free(msg); - - return send_rll_simple(RSL_MT_SUSP_CONF, &dl->mctx); -} - -/* L3 requests resume of data link */ -static int rslms_rx_rll_res_req(struct msgb *msg, struct lapdm_datalink *dl) -{ - struct lapdm_entity *le = dl->entity; - struct abis_rsl_rll_hdr *rllh = msgb_l2(msg); - uint8_t chan_nr = rllh->chan_nr; - uint8_t link_id = rllh->link_id; - uint8_t sapi = rllh->link_id & 7; - struct tlv_parsed tv; - uint8_t length; - uint8_t n201 = 23; //FIXME - - /* Set chan_nr and link_id for established connection */ - memset(&dl->mctx, 0, sizeof(dl->mctx)); - dl->mctx.dl = dl; - dl->mctx.n201 = n201; - dl->mctx.chan_nr = chan_nr; - dl->mctx.link_id = link_id; - - rsl_tlv_parse(&tv, rllh->data, msgb_l2len(msg)-sizeof(*rllh)); - if (!TLVP_PRESENT(&tv, RSL_IE_L3_INFO)) { - LOGP(DLAPDM, LOGL_ERROR, "resume without message error\n"); - msgb_free(msg); - return send_rll_simple(RSL_MT_REL_IND, &dl->mctx); - } - length = TLVP_LEN(&tv, RSL_IE_L3_INFO); - - LOGP(DLAPDM, LOGL_INFO, "perform re-establishment (SABM) length=%d\n", - length); - - /* Replace message in the send-buffer (reconnect) */ - if (dl->send_buffer) - msgb_free(dl->send_buffer); - dl->send_out = 0; - if (length) { - /* Remove the RSL/RLL header */ - msgb_pull_l2h(msg); - /* Write data into the send buffer, to be sent first */ - dl->send_buffer = msg; - } - - /* Discard partly received L3 message */ - if (dl->rcv_buffer) { - msgb_free(dl->rcv_buffer); - dl->rcv_buffer = NULL; - } - - /* Create new msgb (old one is now free) */ - msg = msgb_alloc_headroom(23+10, 10, "LAPDm SABM"); - msg->l2h = msgb_put(msg, 3); - msg->l2h[0] = LAPDm_ADDR(LAPDm_LPD_NORMAL, sapi, le->cr.loc2rem.cmd); - msg->l2h[1] = LAPDm_CTRL_U(LAPDm_U_SABM, 1); - msg->l2h[2] = LAPDm_LEN(0); - /* Transmit-buffer carries exactly one segment */ - memcpy(dl->tx_hist[0], msg->l2h, 3); - dl->tx_length[0] = 3; - /* set Vs to 0, because it is used as index when resending SABM */ - dl->V_send = 0; - - /* Set states */ - dl->own_busy = dl->peer_busy = 0; - dl->retrans_ctr = 0; - lapdm_dl_newstate(dl, LAPDm_STATE_SABM_SENT); - - /* Tramsmit and start T200 */ - osmo_timer_schedule(&dl->t200, T200); - return tx_ph_data_enqueue(dl, msg, chan_nr, link_id, n201); -} - -/* L3 requests release of data link */ -static int rslms_rx_rll_rel_req(struct msgb *msg, struct lapdm_datalink *dl) -{ - struct lapdm_entity *le = dl->entity; - struct abis_rsl_rll_hdr *rllh = msgb_l2(msg); - uint8_t chan_nr = rllh->chan_nr; - uint8_t link_id = rllh->link_id; - uint8_t sapi = rllh->link_id & 7; - uint8_t mode = 0; - - /* get release mode */ - if (rllh->data[0] == RSL_IE_RELEASE_MODE) - mode = rllh->data[1] & 1; - - /* local release */ - if (mode) { - LOGP(DLAPDM, LOGL_INFO, "perform local release\n"); - msgb_free(msg); - /* reset Timer T200 */ - osmo_timer_del(&dl->t200); - /* enter idle state */ - lapdm_dl_newstate(dl, LAPDm_STATE_IDLE); - /* flush buffers */ - lapdm_dl_flush_tx(dl); - lapdm_dl_flush_send(dl); - /* send notification to L3 */ - return send_rll_simple(RSL_MT_REL_CONF, &dl->mctx); - } - - /* in case we are already disconnecting */ - if (dl->state == LAPDm_STATE_DISC_SENT) - return -EBUSY; - - LOGP(DLAPDM, LOGL_INFO, "perform normal release (DISC)\n"); - - /* Pull rllh */ - msgb_pull(msg, msg->tail - msg->l2h); - - /* Push LAPDm header on msgb */ - msg->l2h = msgb_push(msg, 3); - msg->l2h[0] = LAPDm_ADDR(LAPDm_LPD_NORMAL, sapi, le->cr.loc2rem.cmd); - msg->l2h[1] = LAPDm_CTRL_U(LAPDm_U_DISC, 1); - msg->l2h[2] = LAPDm_LEN(0); - /* Transmit-buffer carries exactly one segment */ - memcpy(dl->tx_hist[0], msg->l2h, 3); - dl->tx_length[0] = 3; - - /* Set states */ - dl->own_busy = dl->peer_busy = 0; - dl->retrans_ctr = 0; - lapdm_dl_newstate(dl, LAPDm_STATE_DISC_SENT); - - /* Tramsmit and start T200 */ - osmo_timer_schedule(&dl->t200, T200); - return tx_ph_data_enqueue(dl, msg, chan_nr, link_id, dl->mctx.n201); -} - -/* L3 requests release in idle state */ -static int rslms_rx_rll_rel_req_idle(struct msgb *msg, struct lapdm_datalink *dl) -{ - msgb_free(msg); - - /* send notification to L3 */ - return send_rll_simple(RSL_MT_REL_CONF, &dl->mctx); -} - -/* L3 requests channel in idle state */ -static int rslms_rx_chan_rqd(struct lapdm_channel *lc, struct msgb *msg) -{ - struct abis_rsl_cchan_hdr *cch = msgb_l2(msg); - void *l1ctx = lc->lapdm_dcch.l1_ctx; - struct osmo_phsap_prim pp; - - osmo_prim_init(&pp.oph, SAP_GSM_PH, PRIM_PH_RACH, - PRIM_OP_REQUEST, NULL); - - if (msgb_l2len(msg) < sizeof(*cch) + 4 + 2 + 2) { - LOGP(DRSL, LOGL_ERROR, "Message too short for CHAN RQD!\n"); - return -EINVAL; - } - if (cch->data[0] != RSL_IE_REQ_REFERENCE) { - LOGP(DRSL, LOGL_ERROR, "Missing REQ REFERENCE IE\n"); - return -EINVAL; - } - pp.u.rach_req.ra = cch->data[1]; - pp.u.rach_req.offset = ((cch->data[2] & 0x7f) << 8) | cch->data[3]; - pp.u.rach_req.is_combined_ccch = cch->data[2] >> 7; - - if (cch->data[4] != RSL_IE_ACCESS_DELAY) { - LOGP(DRSL, LOGL_ERROR, "Missing ACCESS_DELAY IE\n"); - return -EINVAL; - } - /* TA = 0 - delay */ - pp.u.rach_req.ta = 0 - cch->data[5]; - - if (cch->data[6] != RSL_IE_MS_POWER) { - LOGP(DRSL, LOGL_ERROR, "Missing MS POWER IE\n"); - return -EINVAL; - } - pp.u.rach_req.tx_power = cch->data[7]; - - msgb_free(msg); - - return lc->lapdm_dcch.l1_prim_cb(&pp.oph, l1ctx); -} - -/* L1 confirms channel request */ -static int l2_ph_chan_conf(struct msgb *msg, struct lapdm_entity *le, uint32_t frame_nr) -{ - struct abis_rsl_cchan_hdr *ch; - struct gsm_time tm; - struct gsm48_req_ref *ref; - - gsm_fn2gsmtime(&tm, frame_nr); - - msgb_pull_l2h(msg); - msg->l2h = msgb_push(msg, sizeof(*ch) + sizeof(*ref)); - ch = (struct abis_rsl_cchan_hdr *)msg->l2h; - rsl_init_cchan_hdr(ch, RSL_MT_CHAN_CONF); - ch->chan_nr = RSL_CHAN_RACH; - ch->data[0] = RSL_IE_REQ_REFERENCE; - ref = (struct gsm48_req_ref *) (ch->data + 1); - ref->t1 = tm.t1; - ref->t2 = tm.t2; - ref->t3_low = tm.t3 & 0x7; - ref->t3_high = tm.t3 >> 3; - - return rslms_sendmsg(msg, le); -} - -const char *lapdm_state_names[] = { - "LAPDm_STATE_NULL", - "LAPDm_STATE_IDLE", - "LAPDm_STATE_SABM_SENT", - "LAPDm_STATE_MF_EST", - "LAPDm_STATE_TIMER_RECOV", - "LAPDm_STATE_DISC_SENT", -}; - -/* statefull handling for RSLms RLL messages from L3 */ -static struct l2downstate { - uint32_t states; - int type; - int (*rout) (struct msgb *msg, struct lapdm_datalink *dl); -} l2downstatelist[] = { - /* create and send UI command */ - {ALL_STATES, - RSL_MT_UNIT_DATA_REQ, rslms_rx_rll_udata_req}, - - /* create and send SABM command */ - {SBIT(LAPDm_STATE_IDLE), - RSL_MT_EST_REQ, rslms_rx_rll_est_req}, - - /* create and send I command */ - {SBIT(LAPDm_STATE_MF_EST) | - SBIT(LAPDm_STATE_TIMER_RECOV), - RSL_MT_DATA_REQ, rslms_rx_rll_data_req}, - - /* suspend datalink */ - {SBIT(LAPDm_STATE_MF_EST) | - SBIT(LAPDm_STATE_TIMER_RECOV), - RSL_MT_SUSP_REQ, rslms_rx_rll_susp_req}, - - /* create and send SABM command (resume) */ - {SBIT(LAPDm_STATE_MF_EST) | - SBIT(LAPDm_STATE_TIMER_RECOV), - RSL_MT_RES_REQ, rslms_rx_rll_res_req}, - - /* create and send SABM command (reconnect) */ - {SBIT(LAPDm_STATE_IDLE) | - SBIT(LAPDm_STATE_MF_EST) | - SBIT(LAPDm_STATE_TIMER_RECOV), - RSL_MT_RECON_REQ, rslms_rx_rll_res_req}, - - /* create and send DISC command */ - {SBIT(LAPDm_STATE_SABM_SENT) | - SBIT(LAPDm_STATE_MF_EST) | - SBIT(LAPDm_STATE_TIMER_RECOV) | - SBIT(LAPDm_STATE_DISC_SENT), - RSL_MT_REL_REQ, rslms_rx_rll_rel_req}, - - /* release in idle state */ - {SBIT(LAPDm_STATE_IDLE), - RSL_MT_REL_REQ, rslms_rx_rll_rel_req_idle}, -}; - -#define L2DOWNSLLEN \ - (sizeof(l2downstatelist) / sizeof(struct l2downstate)) - -/* incoming RSLms RLL message from L3 */ -static int rslms_rx_rll(struct msgb *msg, struct lapdm_channel *lc) -{ - struct abis_rsl_rll_hdr *rllh = msgb_l2(msg); - int msg_type = rllh->c.msg_type; - uint8_t sapi = rllh->link_id & 7; - struct lapdm_entity *le; - struct lapdm_datalink *dl; - int i, supported = 0; - int rc = 0; - - if (msgb_l2len(msg) < sizeof(*rllh)) { - LOGP(DRSL, LOGL_ERROR, "Message too short for RLL hdr!\n"); - return -EINVAL; - } - - if (rllh->link_id & 0x40) - le = &lc->lapdm_acch; - else - le = &lc->lapdm_dcch; - - /* G.2.1 No action schall be taken on frames containing an unallocated - * SAPI. - */ - dl = datalink_for_sapi(le, sapi); - if (!dl) { - LOGP(DRSL, LOGL_ERROR, "No instance for SAPI %d!\n", sapi); - return -EINVAL; - } - - LOGP(DRSL, LOGL_INFO, "(%p) RLL Message '%s' received in state %s\n", - lc->name, rsl_msg_name(msg_type), lapdm_state_names[dl->state]); - - /* find function for current state and message */ - for (i = 0; i < L2DOWNSLLEN; i++) { - if (msg_type == l2downstatelist[i].type) - supported = 1; - if ((msg_type == l2downstatelist[i].type) - && ((1 << dl->state) & l2downstatelist[i].states)) - break; - } - if (!supported) { - LOGP(DRSL, LOGL_NOTICE, "Message unsupported.\n"); - msgb_free(msg); - return 0; - } - if (i == L2DOWNSLLEN) { - LOGP(DRSL, LOGL_NOTICE, "Message unhandled at this state.\n"); - msgb_free(msg); - return 0; - } - - rc = l2downstatelist[i].rout(msg, dl); - - return rc; -} - -/* incoming RSLms COMMON CHANNEL message from L3 */ -static int rslms_rx_com_chan(struct msgb *msg, struct lapdm_channel *lc) -{ - struct abis_rsl_cchan_hdr *cch = msgb_l2(msg); - int msg_type = cch->c.msg_type; - int rc = 0; - - if (msgb_l2len(msg) < sizeof(*cch)) { - LOGP(DRSL, LOGL_ERROR, "Message too short for COM CHAN hdr!\n"); - return -EINVAL; - } - - switch (msg_type) { - case RSL_MT_CHAN_RQD: - /* create and send RACH request */ - rc = rslms_rx_chan_rqd(lc, msg); - break; - default: - LOGP(DRSL, LOGL_NOTICE, "Unknown COMMON CHANNEL msg %d!\n", - msg_type); - msgb_free(msg); - return 0; - } - - return rc; -} - -/* input into layer2 (from layer 3) */ -int lapdm_rslms_recvmsg(struct msgb *msg, struct lapdm_channel *lc) -{ - struct abis_rsl_common_hdr *rslh = msgb_l2(msg); - int rc = 0; - - if (msgb_l2len(msg) < sizeof(*rslh)) { - LOGP(DRSL, LOGL_ERROR, "Message too short RSL hdr!\n"); - return -EINVAL; - } - - switch (rslh->msg_discr & 0xfe) { - case ABIS_RSL_MDISC_RLL: - rc = rslms_rx_rll(msg, lc); - break; - case ABIS_RSL_MDISC_COM_CHAN: - rc = rslms_rx_com_chan(msg, lc); - break; - default: - LOGP(DRSL, LOGL_ERROR, "unknown RSLms message " - "discriminator 0x%02x", rslh->msg_discr); - msgb_free(msg); - return -EINVAL; - } - - return rc; -} - -int lapdm_entity_set_mode(struct lapdm_entity *le, enum lapdm_mode mode) -{ - switch (mode) { - case LAPDM_MODE_MS: - le->cr.loc2rem.cmd = CR_MS2BS_CMD; - le->cr.loc2rem.resp = CR_MS2BS_RESP; - le->cr.rem2loc.cmd = CR_BS2MS_CMD; - le->cr.rem2loc.resp = CR_BS2MS_RESP; - break; - case LAPDM_MODE_BTS: - le->cr.loc2rem.cmd = CR_BS2MS_CMD; - le->cr.loc2rem.resp = CR_BS2MS_RESP; - le->cr.rem2loc.cmd = CR_MS2BS_CMD; - le->cr.rem2loc.resp = CR_MS2BS_RESP; - break; - default: - return -EINVAL; - } - - le->mode = mode; - - return 0; -} - -int lapdm_channel_set_mode(struct lapdm_channel *lc, enum lapdm_mode mode) -{ - int rc; - - rc = lapdm_entity_set_mode(&lc->lapdm_dcch, mode); - if (rc < 0) - return rc; - - return lapdm_entity_set_mode(&lc->lapdm_acch, mode); -} - -void lapdm_channel_set_l1(struct lapdm_channel *lc, osmo_prim_cb cb, void *ctx) -{ - lc->lapdm_dcch.l1_prim_cb = cb; - lc->lapdm_acch.l1_prim_cb = cb; - lc->lapdm_dcch.l1_ctx = ctx; - lc->lapdm_acch.l1_ctx = ctx; -} - -void lapdm_channel_set_l3(struct lapdm_channel *lc, lapdm_cb_t cb, void *ctx) -{ - lc->lapdm_dcch.l3_cb = cb; - lc->lapdm_acch.l3_cb = cb; - lc->lapdm_dcch.l3_ctx = ctx; - lc->lapdm_acch.l3_ctx = ctx; -} - -void lapdm_entity_reset(struct lapdm_entity *le) -{ - struct lapdm_datalink *dl; - int i; - - for (i = 0; i < ARRAY_SIZE(le->datalink); i++) { - dl = &le->datalink[i]; - if (dl->state == LAPDm_STATE_IDLE) - continue; - LOGP(DLAPDM, LOGL_INFO, "Resetting LAPDm instance\n"); - /* reset Timer T200 */ - osmo_timer_del(&dl->t200); - /* enter idle state */ - dl->state = LAPDm_STATE_IDLE; - /* flush buffer */ - lapdm_dl_flush_tx(dl); - lapdm_dl_flush_send(dl); - } -} - -void lapdm_channel_reset(struct lapdm_channel *lc) -{ - lapdm_entity_reset(&lc->lapdm_dcch); - lapdm_entity_reset(&lc->lapdm_acch); -} - -void lapdm_entity_set_flags(struct lapdm_entity *le, unsigned int flags) -{ - le->flags = flags; -} - -void lapdm_channel_set_flags(struct lapdm_channel *lc, unsigned int flags) -{ - lapdm_entity_set_flags(&lc->lapdm_dcch, flags); - lapdm_entity_set_flags(&lc->lapdm_acch, flags); -} diff --git a/src/host/layer23/src/common/logging.c b/src/host/layer23/src/common/logging.c index 82ce914f..ce138b7a 100644 --- a/src/host/layer23/src/common/logging.c +++ b/src/host/layer23/src/common/logging.c @@ -91,11 +91,6 @@ static const struct log_info_cat default_categories[] = { .color = "\033[33m", .enabled = 1, .loglevel = LOGL_DEBUG, }, - [DLAPDM] = { - .name = "DLAPDM", - .description = "LAPDm Layer2", - .enabled = 1, .loglevel = LOGL_NOTICE, - }, [DL1C] = { .name = "DL1C", .description = "Layer 1 Control", diff --git a/src/host/layer23/src/common/main.c b/src/host/layer23/src/common/main.c index 751f95ea..eb47b262 100644 --- a/src/host/layer23/src/common/main.c +++ b/src/host/layer23/src/common/main.c @@ -26,7 +26,6 @@ #include #include #include -#include #include #include diff --git a/src/host/layer23/src/misc/app_bcch_scan.c b/src/host/layer23/src/misc/app_bcch_scan.c index 4c31f1a4..7b21ed79 100644 --- a/src/host/layer23/src/misc/app_bcch_scan.c +++ b/src/host/layer23/src/misc/app_bcch_scan.c @@ -23,7 +23,6 @@ #include #include -#include #include #include #include diff --git a/src/host/layer23/src/misc/app_cbch_sniff.c b/src/host/layer23/src/misc/app_cbch_sniff.c index fb043db1..2f45e483 100644 --- a/src/host/layer23/src/misc/app_cbch_sniff.c +++ b/src/host/layer23/src/misc/app_cbch_sniff.c @@ -24,7 +24,6 @@ #include #include -#include #include #include #include diff --git a/src/host/layer23/src/misc/app_ccch_scan.c b/src/host/layer23/src/misc/app_ccch_scan.c index 2f605059..540aa375 100644 --- a/src/host/layer23/src/misc/app_ccch_scan.c +++ b/src/host/layer23/src/misc/app_ccch_scan.c @@ -33,7 +33,6 @@ #include #include -#include #include #include #include diff --git a/src/host/layer23/src/misc/app_echo_test.c b/src/host/layer23/src/misc/app_echo_test.c index 3d937d23..3a0ee0f4 100644 --- a/src/host/layer23/src/misc/app_echo_test.c +++ b/src/host/layer23/src/misc/app_echo_test.c @@ -23,7 +23,6 @@ #include #include -#include #include #include #include diff --git a/src/host/layer23/src/misc/bcch_scan.c b/src/host/layer23/src/misc/bcch_scan.c index ddd0eea6..99298328 100644 --- a/src/host/layer23/src/misc/bcch_scan.c +++ b/src/host/layer23/src/misc/bcch_scan.c @@ -40,7 +40,6 @@ #include #include -#include #include /* somewhere in 05.08 */ diff --git a/src/host/layer23/src/misc/cell_log.c b/src/host/layer23/src/misc/cell_log.c index 1a9c33c6..aa964f48 100644 --- a/src/host/layer23/src/misc/cell_log.c +++ b/src/host/layer23/src/misc/cell_log.c @@ -39,7 +39,6 @@ #include #include -#include #include #include #include diff --git a/src/host/layer23/src/misc/rslms.c b/src/host/layer23/src/misc/rslms.c index 68956f9c..455e6631 100644 --- a/src/host/layer23/src/misc/rslms.c +++ b/src/host/layer23/src/misc/rslms.c @@ -30,7 +30,7 @@ #include #include -#include +#include #include #include #include diff --git a/src/host/layer23/src/mobile/app_mobile.c b/src/host/layer23/src/mobile/app_mobile.c index 9cb9b0c3..eeb76a82 100644 --- a/src/host/layer23/src/mobile/app_mobile.c +++ b/src/host/layer23/src/mobile/app_mobile.c @@ -28,7 +28,6 @@ #include #include #include -#include #include #include #include -- cgit v1.2.3