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<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Hi,</div>
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<br>
</div>
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RFC 8415 sections 18.3.7 and 18.3.8 both end with the same sentence about the</div>
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IA a server returns when it has no binding for one:</div>
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<br>
</div>
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For each IA in the Release message for which the server has no binding</div>
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information, the server adds an IA option using the IAID from the</div>
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Release message and includes a Status Code option with the value</div>
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NoBinding in the IA option. No other options are included in the IA</div>
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option.</div>
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<br>
</div>
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dnsmasq also puts an OPTION6_IAADDR in that IA, ahead of the status code.</div>
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<br>
</div>
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Present in current master: 1f12252 ("Make configuration for DHCPv4 options and</div>
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DHCPv6 options consistent.", 2026-07-27), i.e. v2.93-16-g1f12252.</div>
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<br>
</div>
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What I see, for a Release naming an address the server holds no lease for:</div>
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<br>
</div>
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option 1 len 10 CLIENTID</div>
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option 2 len 10 SERVERID</div>
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option 3 len 62 IA_NA</div>
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sub-option 5 len 24 IAADDR <-- not permitted here</div>
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sub-option 13 len 18 STATUS_CODE = 3 (NoBinding)</div>
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option 13 len 18 STATUS_CODE = 0</div>
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<br>
</div>
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Decline gives the same shape. Renew, which reaches NoBinding through</div>
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section 18.3.4 and has no equivalent sentence, emits the IA with the status</div>
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code alone:</div>
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<br>
</div>
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option 3 len 34 IA_NA</div>
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sub-option 13 len 18 STATUS_CODE = 3 (NoBinding)</div>
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<br>
</div>
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So the correct shape is already produced on a neighbouring path; it is the two</div>
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blocks below that add the extra option.</div>
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<br>
</div>
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In src/rfc3315.c, in both the DHCP6RELEASE and DHCP6DECLINE cases, the inner</div>
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loop over the client's IAADDRs does this when no lease matches:</div>
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<br>
</div>
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else</div>
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{</div>
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if (!made_ia)</div>
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{</div>
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o = new_opt6(state->ia_type);</div>
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...</div>
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made_ia = 1;</div>
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}</div>
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<br>
</div>
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o1 = new_opt6(OPTION6_IAADDR);</div>
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put_opt6(&addr, IN6ADDRSZ);</div>
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put_opt6_long(0);</div>
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put_opt6_long(0);</div>
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end_opt6(o1);</div>
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}</div>
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<br>
</div>
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Stated in words, in case the diff below does not survive the mail: the change</div>
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is to delete those five lines -- the `o1 = new_opt6(OPTION6_IAADDR);` call, the</div>
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three put_opt6* calls that follow it, and the matching `end_opt6(o1);` -- in</div>
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both the DHCP6RELEASE and the DHCP6DECLINE case. Nothing is added, no other</div>
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line moves, and `made_ia` keeps its current role of deciding whether the IA is</div>
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emitted at all.</div>
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<br>
</div>
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It is in the branch taken when lease6_find() returned nothing; the</div>
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bound-address branch is lease_prune(lease, now) in the `if`, which is</div>
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untouched, so releasing or declining an address the server does have stays as</div>
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it was. The two other OPTION6_IAADDR sites in the file, around lines 1057 and</div>
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1670 on the assignment path, are also untouched.</div>
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<br>
</div>
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I have a small standalone reproducer if it is useful: dnsmasq's own sources</div>
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plus a short driver that calls dhcp6_reply() directly, no root or network</div>
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needed, printing the options nested inside each IA. Happy to post it.</div>
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<br>
</div>
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Found with a conformance checker that builds a reference model from RFC 8415</div>
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and compares the reply against the response class the RFC requires. Worth</div>
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noting this one is invisible to differential testing: every field in the reply</div>
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is individually legal, and only the rule about what may sit beside NoBinding</div>
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inside one IA makes it wrong.</div>
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<br>
</div>
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Best regards,</div>
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Zhou Qingyang</div>
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<br>
</div>
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<br>
</div>
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<br>
</div>
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--- a/src/rfc3315.c</div>
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+++ b/src/rfc3315.c</div>
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@@ -1193,12 +1193,6 @@</div>
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
}</div>
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made_ia = 1;</div>
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
}</div>
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- </div>
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- o1 = new_opt6(OPTION6_IAADDR);</div>
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
- put_opt6(&addr, IN6ADDRSZ);</div>
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
- put_opt6_long(0);</div>
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- put_opt6_long(0);</div>
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
- end_opt6(o1);</div>
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}</div>
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}</div>
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</div>
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@@ -1274,12 +1268,6 @@</div>
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}</div>
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
made_ia = 1;</div>
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
}</div>
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
- </div>
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
- o1 = new_opt6(OPTION6_IAADDR);</div>
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
- put_opt6(&addr, IN6ADDRSZ);</div>
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
- put_opt6_long(0);</div>
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
- put_opt6_long(0);</div>
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
- end_opt6(o1);</div>
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
}</div>
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
}</div>
</body>
</html>