Date: Sun, 11 Apr 2021 13:24:49 -0700 From: Michael Sierchio <kudzu@tenebras.com> To: "freebsd-ipfw@freebsd.org" <freebsd-ipfw@freebsd.org>, "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: How to support QUIC with ipfw Message-ID: <CAHu1Y73zGYPmsDu6YhzES0FHkZPpVdxL==h_zoRrjdDr9UTQVQ@mail.gmail.com>
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Hi, all. I noticed my firewall was dropping what seemed to be unsolicited UDP connections from Google and Facebook, but this turned out to be QUIC traffic. The traffic can be initiated by the browser (or other supporting software) or the server. The problem is that dynamic rules generally don't cut it =E2=80=93 udp traffic here is predominantly NTP and DNS, and the dyn= amic rule lifetime for UDP is very short (3-6 s). And of course they don't work at all for traffic initiated by the server side. My kludgy solution at present is to troll the dynamic rules, locate the TCP connections in them with 443 and 5228 as the target port, and add those addresses to a table that permits UDP traffic from those ports. I only see QUIC on IPv6, by the way. The cron job runs once per minute, adds the addresses seen, and deletes those older than N seconds. I use time_t seconds since epoch as the table arg, so I know when it was added or refreshed. Any suggestions on a better solution? Thanks. =E2=80=93 M --=20 "Well," Brahm=C4=81 said, "even after ten thousand explanations, a fool is = no wiser, but an intelligent person requires only two thousand five hundred." - The Mah=C4=81bh=C4=81rata
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