<p>neels has uploaded this change for <strong>review</strong>.</p><p><a href="https://gerrit.osmocom.org/c/osmo-bsc/+/24676">View Change</a></p><pre style="font-family: monospace,monospace; white-space: pre-wrap;">rewire build_encr_info() to return errors<br><br>In build_encr_info(), validate the algorithm and key presence and return<br>negative if errors are encountered.<br><br>At all callers, handle the error case.<br><br>An upcoming patch will add handling of Kc128 for A5/4 encryption and<br>also wants to return error codes. This is a preparation for that patch:<br>I7c458c8a7350f34ff79531b3c891e1b367614469<br><br>Related: SYS#5324<br>Change-Id: I125d8aabceddd5b34cb98978cee9b6d2fc8fd0f2<br>---<br>M src/osmo-bsc/abis_rsl.c<br>1 file changed, 28 insertions(+), 3 deletions(-)<br><br></pre><pre style="font-family: monospace,monospace; white-space: pre-wrap;">git pull ssh://gerrit.osmocom.org:29418/osmo-bsc refs/changes/76/24676/1</pre><pre style="font-family: monospace,monospace; white-space: pre-wrap;"><span>diff --git a/src/osmo-bsc/abis_rsl.c b/src/osmo-bsc/abis_rsl.c</span><br><span>index ac8006d..f7072c9 100644</span><br><span>--- a/src/osmo-bsc/abis_rsl.c</span><br><span>+++ b/src/osmo-bsc/abis_rsl.c</span><br><span>@@ -152,13 +152,30 @@</span><br><span> memset(out+len, 0x2b, GSM_MACBLOCK_LEN - len);</span><br><span> }</span><br><span> </span><br><span style="color: hsl(0, 100%, 40%);">-/* Chapter 9.3.7: Encryption Information */</span><br><span style="color: hsl(120, 100%, 40%);">+/* Chapter 9.3.7: Encryption Information</span><br><span style="color: hsl(120, 100%, 40%);">+ * Return negative on error, number of bytes written to 'out' on success.</span><br><span style="color: hsl(120, 100%, 40%);">+ * 'out' must provide room for 17 bytes. */</span><br><span> static int build_encr_info(uint8_t *out, struct gsm_lchan *lchan)</span><br><span> {</span><br><span> *out++ = lchan->encr.alg_id & 0xff;</span><br><span style="color: hsl(0, 100%, 40%);">- if (lchan->encr.key_len)</span><br><span style="color: hsl(120, 100%, 40%);">+ switch (lchan->encr.alg_id) {</span><br><span style="color: hsl(120, 100%, 40%);">+ case GSM0808_ALG_ID_A5_0:</span><br><span style="color: hsl(120, 100%, 40%);">+ return 1;</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+ case GSM0808_ALG_ID_A5_1:</span><br><span style="color: hsl(120, 100%, 40%);">+ case GSM0808_ALG_ID_A5_2:</span><br><span style="color: hsl(120, 100%, 40%);">+ case GSM0808_ALG_ID_A5_3:</span><br><span style="color: hsl(120, 100%, 40%);">+ if (!lchan->encr.key_len) {</span><br><span style="color: hsl(120, 100%, 40%);">+ LOG_LCHAN(lchan, LOGL_ERROR, "A5/%d encryption chosen, but missing Kc\n", lchan->encr.alg_id);</span><br><span style="color: hsl(120, 100%, 40%);">+ return -EINVAL;</span><br><span style="color: hsl(120, 100%, 40%);">+ }</span><br><span> memcpy(out, lchan->encr.key, lchan->encr.key_len);</span><br><span style="color: hsl(0, 100%, 40%);">- return lchan->encr.key_len + 1;</span><br><span style="color: hsl(120, 100%, 40%);">+ return 1 + lchan->encr.key_len;</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+ default:</span><br><span style="color: hsl(120, 100%, 40%);">+ LOG_LCHAN(lchan, LOGL_ERROR, "A5/%d encryption not supported\n", lchan->encr.alg_id);</span><br><span style="color: hsl(120, 100%, 40%);">+ return -EINVAL;</span><br><span style="color: hsl(120, 100%, 40%);">+ }</span><br><span> }</span><br><span> </span><br><span> /* If the TLV contain an RSL Cause IE, return pointer to the cause value. If there is no Cause IE, return</span><br><span>@@ -595,6 +612,10 @@</span><br><span> rc = build_encr_info(encr_info, lchan);</span><br><span> if (rc > 0)</span><br><span> msgb_tlv_put(msg, RSL_IE_ENCR_INFO, rc, encr_info);</span><br><span style="color: hsl(120, 100%, 40%);">+ if (rc < 0) {</span><br><span style="color: hsl(120, 100%, 40%);">+ msgb_free(msg);</span><br><span style="color: hsl(120, 100%, 40%);">+ return rc;</span><br><span style="color: hsl(120, 100%, 40%);">+ }</span><br><span> }</span><br><span> </span><br><span> switch (act_type) {</span><br><span>@@ -688,6 +709,10 @@</span><br><span> rc = build_encr_info(encr_info, lchan);</span><br><span> if (rc > 0)</span><br><span> msgb_tlv_put(msg, RSL_IE_ENCR_INFO, rc, encr_info);</span><br><span style="color: hsl(120, 100%, 40%);">+ if (rc < 0) {</span><br><span style="color: hsl(120, 100%, 40%);">+ msgb_free(msg);</span><br><span style="color: hsl(120, 100%, 40%);">+ return rc;</span><br><span style="color: hsl(120, 100%, 40%);">+ }</span><br><span> }</span><br><span> </span><br><span> if (gsm48_chan_mode_to_non_vamos(lchan->modify.ch_mode_rate.chan_mode) == GSM48_CMODE_SPEECH_AMR) {</span><br><span></span><br></pre><p>To view, visit <a href="https://gerrit.osmocom.org/c/osmo-bsc/+/24676">change 24676</a>. 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<div style="display:none"> Gerrit-Project: osmo-bsc </div>
<div style="display:none"> Gerrit-Branch: master </div>
<div style="display:none"> Gerrit-Change-Id: I125d8aabceddd5b34cb98978cee9b6d2fc8fd0f2 </div>
<div style="display:none"> Gerrit-Change-Number: 24676 </div>
<div style="display:none"> Gerrit-PatchSet: 1 </div>
<div style="display:none"> Gerrit-Owner: neels <nhofmeyr@sysmocom.de> </div>
<div style="display:none"> Gerrit-MessageType: newchange </div>