<p>Harald Welte has uploaded this change for <strong>review</strong>.</p><p><a href="https://gerrit.osmocom.org/13888">View Change</a></p><pre style="font-family: monospace,monospace; white-space: pre-wrap;">gsm0808_utils: Add gsm0808_decode_cell_id_u()<br><br>This function parses a single Cell ID list element into a<br>'union gsm0808_cell_id_u'. This function is going to be used<br>by the upcoming CBSP support.<br><br>Related: OS#3537<br>Change-Id: I08b33881667aa32f01e53ccb70d44d5b79c7c986<br>---<br>M include/osmocom/gsm/gsm0808_utils.h<br>M src/gsm/gsm0808_utils.c<br>M src/gsm/libosmogsm.map<br>3 files changed, 60 insertions(+), 11 deletions(-)<br><br></pre><pre style="font-family: monospace,monospace; white-space: pre-wrap;">git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/88/13888/1</pre><pre style="font-family: monospace,monospace; white-space: pre-wrap;"><span>diff --git a/include/osmocom/gsm/gsm0808_utils.h b/include/osmocom/gsm/gsm0808_utils.h</span><br><span>index 3a7beb7..fa9d18e 100644</span><br><span>--- a/include/osmocom/gsm/gsm0808_utils.h</span><br><span>+++ b/include/osmocom/gsm/gsm0808_utils.h</span><br><span>@@ -94,6 +94,7 @@</span><br><span> const struct osmo_cell_global_id *cgi);</span><br><span> int gsm0808_cell_id_to_cgi(struct osmo_cell_global_id *cgi, const struct gsm0808_cell_id *cid);</span><br><span> void gsm0808_msgb_put_cell_id_u(struct msgb *msg, enum CELL_IDENT id_discr, const union gsm0808_cell_id_u *u);</span><br><span style="color: hsl(120, 100%, 40%);">+int gsm0808_decode_cell_id_u(union gsm0808_cell_id_u *out, enum CELL_IDENT discr, const uint8_t *buf, unsigned int len);</span><br><span> </span><br><span> uint8_t gsm0808_enc_cause(struct msgb *msg, uint16_t cause);</span><br><span> uint8_t gsm0808_enc_aoip_trasp_addr(struct msgb *msg,</span><br><span>diff --git a/src/gsm/gsm0808_utils.c b/src/gsm/gsm0808_utils.c</span><br><span>index e825930..fe86031 100644</span><br><span>--- a/src/gsm/gsm0808_utils.c</span><br><span>+++ b/src/gsm/gsm0808_utils.c</span><br><span>@@ -49,6 +49,17 @@</span><br><span> * \file gsm0808_utils.c</span><br><span> */</span><br><span> </span><br><span style="color: hsl(120, 100%, 40%);">+/* Decode 5-byte LAI list element data (see TS 08.08 3.2.2.27) into MCC/MNC/LAC. */</span><br><span style="color: hsl(120, 100%, 40%);">+static void decode_lai(const uint8_t *data, struct osmo_location_area_id *decoded)</span><br><span style="color: hsl(120, 100%, 40%);">+{</span><br><span style="color: hsl(120, 100%, 40%);">+ struct gsm48_loc_area_id lai;</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+ /* Copy data to stack to prevent unaligned access in gsm48_decode_lai2(). */</span><br><span style="color: hsl(120, 100%, 40%);">+ memcpy(&lai, data, sizeof(lai)); /* don't byte swap yet */</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+ gsm48_decode_lai2(&lai, decoded);</span><br><span style="color: hsl(120, 100%, 40%);">+}</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span> /*! Encode TS 08.08 AoIP Cause IE</span><br><span> * \param[out] msg Message Buffer to which to append IE</span><br><span> * \param[in] cause Cause code to be used in IE</span><br><span>@@ -737,6 +748,53 @@</span><br><span> return (int)(elem - old_elem);</span><br><span> }</span><br><span> </span><br><span style="color: hsl(120, 100%, 40%);">+/*! Decode a single GSM 08.08 Cell ID list element payload</span><br><span style="color: hsl(120, 100%, 40%);">+ * \param[out] out caller-provided output union</span><br><span style="color: hsl(120, 100%, 40%);">+ * \param[in] discr Cell ID discriminator describing type to be decoded</span><br><span style="color: hsl(120, 100%, 40%);">+ * \param[in] buf User-provided input buffer containing binary Cell ID list element</span><br><span style="color: hsl(120, 100%, 40%);">+ * \param[in] len Length of buf</span><br><span style="color: hsl(120, 100%, 40%);">+ * \returns 0 on success; negative on error */</span><br><span style="color: hsl(120, 100%, 40%);">+int gsm0808_decode_cell_id_u(union gsm0808_cell_id_u *out, enum CELL_IDENT discr, const uint8_t *buf, unsigned int len)</span><br><span style="color: hsl(120, 100%, 40%);">+{</span><br><span style="color: hsl(120, 100%, 40%);">+ switch (discr) {</span><br><span style="color: hsl(120, 100%, 40%);">+ case CELL_IDENT_WHOLE_GLOBAL:</span><br><span style="color: hsl(120, 100%, 40%);">+ if (len < 7)</span><br><span style="color: hsl(120, 100%, 40%);">+ return -EINVAL;</span><br><span style="color: hsl(120, 100%, 40%);">+ decode_lai(buf, &out->global.lai);</span><br><span style="color: hsl(120, 100%, 40%);">+ out->global.cell_identity = osmo_load16be(buf + sizeof(struct gsm48_loc_area_id));</span><br><span style="color: hsl(120, 100%, 40%);">+ break;</span><br><span style="color: hsl(120, 100%, 40%);">+ case CELL_IDENT_LAC_AND_CI:</span><br><span style="color: hsl(120, 100%, 40%);">+ if (len < 4)</span><br><span style="color: hsl(120, 100%, 40%);">+ return -EINVAL;</span><br><span style="color: hsl(120, 100%, 40%);">+ out->lac_and_ci.lac = osmo_load16be(buf);</span><br><span style="color: hsl(120, 100%, 40%);">+ out->lac_and_ci.ci = osmo_load16be(buf + sizeof(uint16_t));</span><br><span style="color: hsl(120, 100%, 40%);">+ break;</span><br><span style="color: hsl(120, 100%, 40%);">+ case CELL_IDENT_CI:</span><br><span style="color: hsl(120, 100%, 40%);">+ if (len < 2)</span><br><span style="color: hsl(120, 100%, 40%);">+ return -EINVAL;</span><br><span style="color: hsl(120, 100%, 40%);">+ out->ci = osmo_load16be(buf);</span><br><span style="color: hsl(120, 100%, 40%);">+ break;</span><br><span style="color: hsl(120, 100%, 40%);">+ case CELL_IDENT_LAI_AND_LAC:</span><br><span style="color: hsl(120, 100%, 40%);">+ if (len < 5)</span><br><span style="color: hsl(120, 100%, 40%);">+ return -EINVAL;</span><br><span style="color: hsl(120, 100%, 40%);">+ decode_lai(buf, &out->lai_and_lac);</span><br><span style="color: hsl(120, 100%, 40%);">+ break;</span><br><span style="color: hsl(120, 100%, 40%);">+ case CELL_IDENT_LAC:</span><br><span style="color: hsl(120, 100%, 40%);">+ if (len < 2)</span><br><span style="color: hsl(120, 100%, 40%);">+ return -EINVAL;</span><br><span style="color: hsl(120, 100%, 40%);">+ out->lac = osmo_load16be(buf);</span><br><span style="color: hsl(120, 100%, 40%);">+ break;</span><br><span style="color: hsl(120, 100%, 40%);">+ case CELL_IDENT_BSS:</span><br><span style="color: hsl(120, 100%, 40%);">+ case CELL_IDENT_NO_CELL:</span><br><span style="color: hsl(120, 100%, 40%);">+ /* Does not have any list items */</span><br><span style="color: hsl(120, 100%, 40%);">+ break;</span><br><span style="color: hsl(120, 100%, 40%);">+ default:</span><br><span style="color: hsl(120, 100%, 40%);">+ /* Remaining cell identification types are not implemented. */</span><br><span style="color: hsl(120, 100%, 40%);">+ return -EINVAL;</span><br><span style="color: hsl(120, 100%, 40%);">+ }</span><br><span style="color: hsl(120, 100%, 40%);">+ return 0;</span><br><span style="color: hsl(120, 100%, 40%);">+}</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span> void gsm0808_msgb_put_cell_id_u(struct msgb *msg, enum CELL_IDENT id_discr, const union gsm0808_cell_id_u *u)</span><br><span> {</span><br><span> switch (id_discr) {</span><br><span>@@ -846,17 +904,6 @@</span><br><span> return *tlv_len + 2;</span><br><span> }</span><br><span> </span><br><span style="color: hsl(0, 100%, 40%);">-/* Decode 5-byte LAI list element data (see TS 08.08 3.2.2.27) into MCC/MNC/LAC. */</span><br><span style="color: hsl(0, 100%, 40%);">-static void decode_lai(const uint8_t *data, struct osmo_location_area_id *decoded)</span><br><span style="color: hsl(0, 100%, 40%);">-{</span><br><span style="color: hsl(0, 100%, 40%);">- struct gsm48_loc_area_id lai;</span><br><span style="color: hsl(0, 100%, 40%);">-</span><br><span style="color: hsl(0, 100%, 40%);">- /* Copy data to stack to prevent unaligned access in gsm48_decode_lai2(). */</span><br><span style="color: hsl(0, 100%, 40%);">- memcpy(&lai, data, sizeof(lai)); /* don't byte swap yet */</span><br><span style="color: hsl(0, 100%, 40%);">-</span><br><span style="color: hsl(0, 100%, 40%);">- gsm48_decode_lai2(&lai, decoded);</span><br><span style="color: hsl(0, 100%, 40%);">-}</span><br><span style="color: hsl(0, 100%, 40%);">-</span><br><span> static int parse_cell_id_global_list(struct gsm0808_cell_id_list2 *cil, const uint8_t *data, size_t remain,</span><br><span> size_t *consumed)</span><br><span> {</span><br><span>diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map</span><br><span>index 840bac9..c095650 100644</span><br><span>--- a/src/gsm/libosmogsm.map</span><br><span>+++ b/src/gsm/libosmogsm.map</span><br><span>@@ -243,6 +243,7 @@</span><br><span> gsm0808_enc_lcls;</span><br><span> gsm0808_dec_lcls;</span><br><span> gsm0808_msgb_put_cell_id_u;</span><br><span style="color: hsl(120, 100%, 40%);">+gsm0808_decode_cell_id_u;</span><br><span> </span><br><span> gsm29118_msgb_alloc;</span><br><span> gsm29118_create_alert_req;</span><br><span></span><br></pre><p>To view, visit <a href="https://gerrit.osmocom.org/13888">change 13888</a>. To unsubscribe, or for help writing mail filters, visit <a href="https://gerrit.osmocom.org/settings">settings</a>.</p><div itemscope itemtype="http://schema.org/EmailMessage"><div itemscope itemprop="action" itemtype="http://schema.org/ViewAction"><link itemprop="url" href="https://gerrit.osmocom.org/13888"/><meta itemprop="name" content="View Change"/></div></div>
<div style="display:none"> Gerrit-Project: libosmocore </div>
<div style="display:none"> Gerrit-Branch: master </div>
<div style="display:none"> Gerrit-MessageType: newchange </div>
<div style="display:none"> Gerrit-Change-Id: I08b33881667aa32f01e53ccb70d44d5b79c7c986 </div>
<div style="display:none"> Gerrit-Change-Number: 13888 </div>
<div style="display:none"> Gerrit-PatchSet: 1 </div>
<div style="display:none"> Gerrit-Owner: Harald Welte <laforge@gnumonks.org> </div>