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Merge pull request #19947 from yuwata/network-dad-tiny-fixes

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network: tiny fixes about IPv4ACD
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Luca Boccassi 2021-06-16 09:45:42 +01:00 committed by GitHub
commit aeffa4c3ed
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2 changed files with 11 additions and 3 deletions
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4
man/systemd.network.xml
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@ -1098,8 +1098,8 @@ IPv6Token=prefixstable:2002:da8:1::</programlisting></para>
<listitem>
<para>Takes one of <literal>ipv4</literal>, <literal>ipv6</literal>,
<literal>both</literal>, <literal>none</literal>. When <literal>ipv4</literal>,
performs IPv4 Duplicate Address Detection. See
<ulink url="https://tools.ietf.org/html/rfc5227">RFC 5224</ulink>.
performs IPv4 Address Conflict Detection. See
<ulink url="https://tools.ietf.org/html/rfc5227">RFC 5227</ulink>.
When <literal>ipv6</literal>, performs IPv6 Duplicate Address Detection. See
<ulink url="https://tools.ietf.org/html/rfc4862">RFC 4862</ulink>.
Defaults to <literal>ipv6</literal>.</para>

10
src/network/networkd-address.c
View File

@ -2111,9 +2111,17 @@ static int address_section_verify(Address *address) {
address->scope = RT_SCOPE_HOST;
}
if (!FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV6))
if (address->family == AF_INET6 &&
!FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV6))
address->flags |= IFA_F_NODAD;
if (address->family == AF_INET && in4_addr_is_link_local(&address->in_addr.in) &&
!FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV4)) {
log_debug("%s: An IPv4 link-local address is specified, enabling IPv4 Address Conflict Detection (ACD).",
address->section->filename);
address->duplicate_address_detection |= ADDRESS_FAMILY_IPV4;
}
return 0;
}