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resolve: mark mDNS RRs in the Additional Records section as cacheable

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RFC 6762 does not restrict caching of records in the Additional section.
Caching can improve resolve efficiency.
This commit is contained in:
Vishal Chillara Srinivas 2022-05-31 20:00:47 +05:30 committed by Yu Watanabe
parent 172cbcdc8b
commit 82af03c223
1 changed files with 6 additions and 2 deletions
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8
src/resolve/resolved-dns-packet.c
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@ -2343,13 +2343,17 @@ static int dns_packet_extract_answer(DnsPacket *p, DnsAnswer **ret_answer) {
/* According to RFC 4795, section 2.9. only the RRs from the Answer section shall be
* cached. Hence mark only those RRs as cacheable by default, but not the ones from
* the Additional or Authority sections. */
* the Additional or Authority sections.
* This restriction does not apply to mDNS records (RFC 6762). */
if (i < DNS_PACKET_ANCOUNT(p))
flags |= DNS_ANSWER_CACHEABLE|DNS_ANSWER_SECTION_ANSWER;
else if (i < DNS_PACKET_ANCOUNT(p) + DNS_PACKET_NSCOUNT(p))
flags |= DNS_ANSWER_SECTION_AUTHORITY;
else
else {
flags |= DNS_ANSWER_SECTION_ADDITIONAL;
if (p->protocol == DNS_PROTOCOL_MDNS)
flags |= DNS_ANSWER_CACHEABLE;
}
r = dns_answer_add(answer, rr, p->ifindex, flags, NULL);
if (r < 0)