mirror of https://gerrit.osmocom.org/libosmocore
Merge remote-tracking branch 'daniel/lapdm-desync'
This should fix long delays when sending a long SMS on an encrypted channel. It is the most minimal change to the polling mode. One option we discussed internally is to queue a higher level representation and generate the actual LAPDm frames later.
This commit is contained in:
Holger Hans Peter Freyther
commit
d0ed9218bc
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@ -0,0 +1,2 @@
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#library what description / commit summary line
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libosmogsm abi-change Prevent LAPD tx_queue from filling up in polling mode
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@ -125,6 +125,7 @@ struct lapd_datalink {
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int (*send_dlsap)(struct osmo_dlsap_prim *dp,
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struct lapd_msg_ctx *lctx);
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int (*send_ph_data_req)(struct lapd_msg_ctx *lctx, struct msgb *msg);
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int (*update_pending_frames)(struct lapd_msg_ctx *lctx);
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struct {
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/*! \brief filled-in once we set the lapd_mode above */
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struct lapd_cr_ent loc2rem;
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@ -81,6 +81,8 @@ struct lapdm_channel {
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const char *get_rsl_name(int value);
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extern const char *lapdm_state_names[];
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struct lapdm_datalink *lapdm_datalink_for_sapi(struct lapdm_entity *le, uint8_t sapi);
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/* initialize a LAPDm entity */
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void lapdm_entity_init(struct lapdm_entity *le, enum lapdm_mode mode, int t200);
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void lapdm_channel_init(struct lapdm_channel *lc, enum lapdm_mode mode);
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@ -1607,6 +1607,12 @@ static int lapd_rx_i(struct msgb *msg, struct lapd_msg_ctx *lctx)
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if (!dl->own_busy) {
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/* NOTE: V(R) is already set above */
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rc = lapd_send_i(lctx, __LINE__);
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/* if update_pending_iframe returns 0 it updated
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* the lapd header of an iframe in the tx queue */
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if (rc && dl->update_pending_frames)
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rc = dl->update_pending_frames(lctx);
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if (rc) {
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LOGP(DLLAPD, LOGL_INFO, "we are not busy and "
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"have no pending data, send RR\n");
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@ -114,6 +114,7 @@ enum lapdm_format {
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static int lapdm_send_ph_data_req(struct lapd_msg_ctx *lctx, struct msgb *msg);
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static int send_rslms_dlsap(struct osmo_dlsap_prim *dp,
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struct lapd_msg_ctx *lctx);
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static int update_pending_frames(struct lapd_msg_ctx *lctx);
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static void lapdm_dl_init(struct lapdm_datalink *dl,
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struct lapdm_entity *entity, int t200)
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@ -124,6 +125,7 @@ static void lapdm_dl_init(struct lapdm_datalink *dl,
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dl->dl.reestablish = 0; /* GSM uses no reestablish */
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dl->dl.send_ph_data_req = lapdm_send_ph_data_req;
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dl->dl.send_dlsap = send_rslms_dlsap;
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dl->dl.update_pending_frames = update_pending_frames;
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dl->dl.n200_est_rel = N200_EST_REL;
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dl->dl.n200 = N200;
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dl->dl.t203_sec = 0; dl->dl.t203_usec = 0;
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@ -181,7 +183,7 @@ void lapdm_channel_exit(struct lapdm_channel *lc)
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lapdm_entity_exit(&lc->lapdm_dcch);
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}
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static struct lapdm_datalink *datalink_for_sapi(struct lapdm_entity *le, uint8_t sapi)
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struct lapdm_datalink *lapdm_datalink_for_sapi(struct lapdm_entity *le, uint8_t sapi)
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{
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switch (sapi) {
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case LAPDm_SAPI_NORMAL:
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@ -488,6 +490,25 @@ static int lapdm_send_ph_data_req(struct lapd_msg_ctx *lctx, struct msgb *msg)
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23);
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}
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static int update_pending_frames(struct lapd_msg_ctx *lctx)
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{
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struct lapd_datalink *dl = lctx->dl;
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struct msgb *msg;
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int rc = -1;
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llist_for_each_entry(msg, &dl->tx_queue, list) {
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if (LAPDm_CTRL_is_I(msg->l2h[1])) {
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msg->l2h[1] = LAPDm_CTRL_I(dl->v_recv, LAPDm_CTRL_I_Ns(msg->l2h[1]),
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LAPDm_CTRL_PF_BIT(msg->l2h[1]));
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rc = 0;
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} else if (LAPDm_CTRL_is_S(msg->l2h[1])) {
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LOGP(DLLAPD, LOGL_ERROR, "Supervisory frame in queue, this shouldn't happen\n");
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}
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}
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return rc;
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}
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/* input into layer2 (from layer 1) */
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static int l2_ph_data_ind(struct msgb *msg, struct lapdm_entity *le,
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uint8_t chan_nr, uint8_t link_id)
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@ -543,7 +564,7 @@ static int l2_ph_data_ind(struct msgb *msg, struct lapdm_entity *le,
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}
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}
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mctx.dl = datalink_for_sapi(le, sapi);
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mctx.dl = lapdm_datalink_for_sapi(le, sapi);
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/* G.2.1 No action on frames containing an unallocated SAPI. */
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if (!mctx.dl) {
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LOGP(DLLAPD, LOGL_NOTICE, "Received frame for unsupported "
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@ -1071,7 +1092,7 @@ static int rslms_rx_rll(struct msgb *msg, struct lapdm_channel *lc)
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/* G.2.1 No action shall be taken on frames containing an unallocated
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* SAPI.
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*/
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dl = datalink_for_sapi(le, sapi);
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dl = lapdm_datalink_for_sapi(le, sapi);
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if (!dl) {
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LOGP(DLLAPD, LOGL_ERROR, "No instance for SAPI %d!\n", sapi);
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msgb_free(msg);
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@ -172,6 +172,7 @@ lapdm_channel_set_flags;
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lapdm_channel_set_l1;
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lapdm_channel_set_l3;
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lapdm_channel_set_mode;
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lapdm_datalink_for_sapi;
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lapdm_entity_exit;
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lapdm_entity_init;
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lapdm_entity_reset;
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@ -1,6 +1,7 @@
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/*
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* (C) 2011 by Holger Hans Peter Freyther
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* (C) 2011 by On-Waves
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* (C) 2014 by Daniel Willmann <dwillmann@sysmocom.de>
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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@ -178,22 +179,66 @@ static int send(struct msgb *in_msg, struct lapdm_channel *chan)
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return 0;
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}
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static int send_sabm(struct lapdm_channel *chan, int second_ms)
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/* Receive from L1 */
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static int send_buf(const uint8_t *buf, size_t len, struct lapdm_channel *chan)
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{
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struct osmo_phsap_prim pp;
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struct msgb *msg;
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int rc;
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msg = msgb_from_array(buf, len);
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msg->l2h = msg->l3h;
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msg->l3h = NULL;
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osmo_prim_init(&pp.oph, SAP_GSM_PH, PRIM_PH_DATA,
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PRIM_OP_INDICATION, msg);
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/* LAPDm requires those... */
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pp.u.data.chan_nr = 0;
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pp.u.data.link_id = 0;
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/* feed into the LAPDm code of libosmogsm */
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rc = lapdm_phsap_up(&pp.oph, &chan->lapdm_dcch);
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OSMO_ASSERT(rc == 0 || rc == -EBUSY);
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return 0;
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}
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/* Receive from L3 */
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static int enqueue_buf(const uint8_t *buf, size_t len, int sapi, struct lapdm_channel *chan)
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{
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struct osmo_dlsap_prim dp;
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struct msgb *msg;
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int rc;
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struct lapdm_datalink *dl;
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dl = lapdm_datalink_for_sapi(&chan->lapdm_dcch, sapi);
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OSMO_ASSERT(dl);
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msg = msgb_from_array(buf, len);
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osmo_prim_init(&dp.oph, 0, PRIM_DL_DATA, PRIM_OP_REQUEST, msg);
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rc = lapd_recv_dlsap(&dp, &dl->dl.lctx);
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OSMO_ASSERT(rc == 0 || rc == -EBUSY);
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return 0;
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}
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static int send_sabm(struct lapdm_channel *chan, int sapi, const uint8_t *data, size_t len)
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{
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struct osmo_phsap_prim pp;
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struct msgb *msg;
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int rc;
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OSMO_ASSERT(sapi == 0 || sapi == 3);
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msg = msgb_alloc_headroom(128, 64, "PH-DATA.ind");
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osmo_prim_init(&pp.oph, SAP_GSM_PH, PRIM_PH_DATA,
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PRIM_OP_INDICATION, msg);
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/* copy over actual MAC block */
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msg->l2h = msgb_put(msg, 23);
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msg->l2h[0] = 0x01;
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msg->l2h = msgb_put(msg, 3 + len);
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msg->l2h[0] = 0x01 | (sapi << 2);
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msg->l2h[1] = 0x3f;
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msg->l2h[2] = 0x01 | (sizeof(cm) << 2);
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memcpy(msg->l2h + 3, cm, sizeof(cm));
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msg->l2h[3] += second_ms; /* alter message, for second mobile */
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msg->l2h[2] = 0x01 | (len << 2);
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if (len > 0)
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memcpy(msg->l2h + 3, data, len);
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/* LAPDm requires those... */
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pp.u.data.chan_nr = 0;
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@ -430,6 +475,7 @@ static void test_lapdm_contention_resolution()
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int rc;
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struct lapdm_polling_state test_state;
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struct osmo_phsap_prim pp;
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uint8_t *cm2;
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/* Configure LAPDm on both sides */
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struct lapdm_channel bts_to_ms_channel;
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@ -445,18 +491,22 @@ static void test_lapdm_contention_resolution()
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lapdm_channel_set_l3(&bts_to_ms_channel, bts_to_ms_tx_cb, &test_state);
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/* Send SABM MS 1, we must get UA */
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send_sabm(&bts_to_ms_channel, 0);
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send_sabm(&bts_to_ms_channel, 0, cm, sizeof(cm));
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rc = dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp, "DCCH");
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CHECK_RC(rc);
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OSMO_ASSERT(memcmp(pp.oph.msg->l2h, ua, ARRAY_SIZE(ua)) == 0);
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/* Send SABM MS 2, we must get nothing, due to collision */
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send_sabm(&bts_to_ms_channel, 1);
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cm2 = malloc(sizeof(cm));
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memcpy(cm2, cm, sizeof(cm));
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cm2[0] += 1;
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send_sabm(&bts_to_ms_channel, 0, cm2, sizeof(cm2));
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free(cm2);
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rc = dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp, "DCCH");
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OSMO_ASSERT(rc == -ENODEV);
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/* Send SABM MS 1 again, we must get UA gain */
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send_sabm(&bts_to_ms_channel, 0);
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send_sabm(&bts_to_ms_channel, 0, cm, sizeof(cm));
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rc = dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp, "DCCH");
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CHECK_RC(rc);
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OSMO_ASSERT(memcmp(pp.oph.msg->l2h, ua, ARRAY_SIZE(ua)) == 0);
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@ -555,6 +605,152 @@ static void test_lapdm_establishment()
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lapdm_establish(est_req_sacch_sapi3, sizeof(est_req_sacch_sapi3));
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}
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const uint8_t cm_chg[] = {
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0x01, 0x00, 0x49, 0x06, 0x16, 0x03, 0x33,
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0x59, 0xa6, 0x20, 0x0a, 0x20, 0x04, 0x04,
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0x2f, 0x65, 0x23, 0x02, 0x00, 0x24, 0x04
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};
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const uint8_t cm_chg_ack[] = {
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0x01, 0x21, 0x01
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};
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const uint8_t gprs_susp[] = {
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0x01, 0x02, 0x35, 0x06, 0x34, 0xe3, 0xd4,
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0xd2, 0x6f, 0x09, 0xf1, 0x07, 0x00, 0x01, 0x00, 0x02
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};
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const uint8_t cipher_cmd[] = {
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0x06, 0x35, 0x01
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};
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/* The cipher command we send to the MS after updating our N(R) */
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const uint8_t cipher_cmd_out[] = {
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0x03, 0x40, 0x0d, 0x06, 0x35, 0x01
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};
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uint8_t cipher_compl[] = {
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0x01, 0x24, 0x09, 0x06, 0x32
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};
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uint8_t cipher_compl_ack[] = {
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0x01, 0x61, 0x01
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};
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static const uint8_t ua_sms[] = {
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0x0d, 0x73, 0x01
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};
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const uint8_t cp_data_1[] = {
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0x0d, 0x00, 0x53, 0x59, 0x01, 0x5c, 0x00,
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0x4c, 0x00, 0x06, 0x91, 0x86, 0x77, 0x07,
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0x00, 0xf9, 0x51, 0x11, 0x76, 0x05, 0x81, 0x29, 0x32
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};
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const uint8_t cp_data_1_ack[] = {
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0x0d, 0x21, 0x01
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};
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static int bts_to_ms_dummy_tx_cb(struct msgb *in_msg, struct lapdm_entity *le, void *_ctx)
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{
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printf("%s: MS->BTS(us) message %d\n", __func__, msgb_length(in_msg));
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msgb_free(in_msg);
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return 0;
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}
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static void dump_queue(struct llist_head *head)
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{
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struct msgb* msg;
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printf("\nDumping queue:\n");
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llist_for_each_entry(msg, head, list)
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printf("%s\n", msgb_hexdump(msg));
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printf("\n");
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}
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static void test_lapdm_desync()
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{
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printf("I test if desync problems exist in LAPDm\n");
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int rc;
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struct osmo_phsap_prim pp;
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/* Configure LAPDm on both sides */
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struct lapdm_channel bts_to_ms_channel;
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memset(&bts_to_ms_channel, 0, sizeof(bts_to_ms_channel));
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/* BTS to MS in polling mode */
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lapdm_channel_init(&bts_to_ms_channel, LAPDM_MODE_BTS);
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lapdm_channel_set_flags(&bts_to_ms_channel, LAPDM_ENT_F_POLLING_ONLY);
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lapdm_channel_set_l1(&bts_to_ms_channel, NULL, NULL);
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lapdm_channel_set_l3(&bts_to_ms_channel, bts_to_ms_dummy_tx_cb, NULL);
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struct lapdm_datalink *dl = lapdm_datalink_for_sapi(&bts_to_ms_channel.lapdm_dcch, 0);
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dl->mctx.dl = dl;
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dl->dl.lctx.dl = &dl->dl;
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/* Send SABM MS 1, we must get UA */
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printf("\nEstablishing SAPI=0\n");
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send_sabm(&bts_to_ms_channel, 0, cm, sizeof(cm));
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dump_queue(&dl->dl.tx_queue);
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rc = dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp, "DCCH");
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CHECK_RC(rc);
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OSMO_ASSERT(memcmp(pp.oph.msg->l2h, ua, ARRAY_SIZE(ua)) == 0);
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printf("\nSending Classmark Change\n");
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send_buf(cm_chg, sizeof(cm_chg), &bts_to_ms_channel);
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dump_queue(&dl->dl.tx_queue);
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rc = dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp, "DCCH");
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CHECK_RC(rc);
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OSMO_ASSERT(memcmp(pp.oph.msg->l2h, cm_chg_ack, ARRAY_SIZE(cm_chg_ack)) == 0);
|
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printf("\nEnqueueing Ciphering Mode Command\n");
|
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enqueue_buf(cipher_cmd, sizeof(cipher_cmd), 0, &bts_to_ms_channel);
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dump_queue(&dl->dl.tx_queue);
|
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|
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printf("\nSending GPRS Suspend Request\n");
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send_buf(gprs_susp, sizeof(gprs_susp), &bts_to_ms_channel);
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dump_queue(&dl->dl.tx_queue);
|
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|
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rc = dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp, "DCCH");
|
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CHECK_RC(rc);
|
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OSMO_ASSERT(memcmp(pp.oph.msg->l2h, cipher_cmd_out, ARRAY_SIZE(cipher_cmd_out)) == 0);
|
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printf("\nSending Cipher Mode Complete\n");
|
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send_buf(cipher_compl, sizeof(cipher_compl), &bts_to_ms_channel);
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dump_queue(&dl->dl.tx_queue);
|
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|
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rc = dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp, "DCCH");
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CHECK_RC(rc);
|
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OSMO_ASSERT(memcmp(pp.oph.msg->l2h, cipher_compl_ack, ARRAY_SIZE(cipher_compl_ack)) == 0);
|
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printf("\nEstablishing SAPI=3\n");
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send_sabm(&bts_to_ms_channel, 3, NULL, 0);
|
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dump_queue(&dl->dl.tx_queue);
|
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|
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rc = dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp, "DCCH");
|
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CHECK_RC(rc);
|
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OSMO_ASSERT(memcmp(pp.oph.msg->l2h, ua_sms, ARRAY_SIZE(ua_sms)) == 0);
|
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|
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printf("\nSending CP-DATA\n");
|
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send_buf(cp_data_1, sizeof(cp_data_1), &bts_to_ms_channel);
|
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dump_queue(&dl->dl.tx_queue);
|
||||
|
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rc = dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp, "DCCH");
|
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CHECK_RC(rc);
|
||||
OSMO_ASSERT(memcmp(pp.oph.msg->l2h, cp_data_1_ack, ARRAY_SIZE(cp_data_1_ack)) == 0);
|
||||
|
||||
/* clean up */
|
||||
lapdm_channel_exit(&bts_to_ms_channel);
|
||||
|
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/* Check if exit is idempotent */
|
||||
lapdm_channel_exit(&bts_to_ms_channel);
|
||||
}
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
osmo_init_logging(&info);
|
||||
|
|
@ -567,6 +763,7 @@ int main(int argc, char **argv)
|
|||
test_lapdm_early_release();
|
||||
test_lapdm_contention_resolution();
|
||||
test_lapdm_establishment();
|
||||
test_lapdm_desync();
|
||||
|
||||
printf("Success.\n");
|
||||
|
||||
|
|
|
|||
|
|
@ -38,4 +38,62 @@ Message: [L2]> 0f 3f 01 [L3]> 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b
|
|||
Testing SAPI3/SACCH
|
||||
Took message from ACCH queue: L2 header size 5, L3 size 18, SAP 0x1000000, 0/0, Link 0x43
|
||||
Message: [L2]> 00 00 0f 3f 01 [L3]> 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b
|
||||
I test if desync problems exist in LAPDm
|
||||
|
||||
Establishing SAPI=0
|
||||
bts_to_ms_dummy_tx_cb: MS->BTS(us) message 25
|
||||
|
||||
Dumping queue:
|
||||
00 00 17 [L2]> 01 73 41 [L3]> 05 24 31 03 50 18 93 08 29 47 80 00 00 00 00 80
|
||||
|
||||
Took message from DCCH queue: L2 header size 3, L3 size 20, SAP 0x1000000, 0/0, Link 0x00
|
||||
Message: [L2]> 01 73 41 [L3]> 05 24 31 03 50 18 93 08 29 47 80 00 00 00 00 80 2b 2b 2b 2b
|
||||
|
||||
Sending Classmark Change
|
||||
bts_to_ms_dummy_tx_cb: MS->BTS(us) message 27
|
||||
|
||||
Dumping queue:
|
||||
00 00 17 [L2]> 01 21 01
|
||||
|
||||
Took message from DCCH queue: L2 header size 23, L3 size 0, SAP 0x1000000, 0/0, Link 0x00
|
||||
Message: [L2]> 01 21 01 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b
|
||||
|
||||
Enqueueing Ciphering Mode Command
|
||||
|
||||
Dumping queue:
|
||||
00 00 17 [L2]> 03 20 0d [L3]> 06 35 01
|
||||
|
||||
|
||||
Sending GPRS Suspend Request
|
||||
bts_to_ms_dummy_tx_cb: MS->BTS(us) message 22
|
||||
|
||||
Dumping queue:
|
||||
00 00 17 [L2]> 03 40 0d [L3]> 06 35 01
|
||||
|
||||
Took message from DCCH queue: L2 header size 3, L3 size 20, SAP 0x1000000, 0/0, Link 0x00
|
||||
Message: [L2]> 03 40 0d [L3]> 06 35 01 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b
|
||||
|
||||
Sending Cipher Mode Complete
|
||||
bts_to_ms_dummy_tx_cb: MS->BTS(us) message 11
|
||||
|
||||
Dumping queue:
|
||||
00 00 17 [L2]> 01 61 01
|
||||
|
||||
Took message from DCCH queue: L2 header size 23, L3 size 0, SAP 0x1000000, 0/0, Link 0x00
|
||||
Message: [L2]> 01 61 01 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b
|
||||
|
||||
Establishing SAPI=3
|
||||
bts_to_ms_dummy_tx_cb: MS->BTS(us) message 6
|
||||
|
||||
Dumping queue:
|
||||
|
||||
Took message from DCCH queue: L2 header size 3, L3 size 20, SAP 0x1000000, 0/0, Link 0x03
|
||||
Message: [L2]> 0d 73 01 [L3]> 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b
|
||||
|
||||
Sending CP-DATA
|
||||
|
||||
Dumping queue:
|
||||
|
||||
Took message from DCCH queue: L2 header size 23, L3 size 0, SAP 0x1000000, 0/0, Link 0x03
|
||||
Message: [L2]> 0d 21 01 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b
|
||||
Success.
|
||||
|
|
|
|||
Loading…
Reference in New Issue