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imsd: P-CSCF candidates from PCSCF_DISCOVERED when PCSCF= is not set

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imsd reads PCSCF_DISCOVERED= — a comma-separated IPv6 list — from its
environment; nothing in this tree writes it yet. FreshPcscfFromEnv picks
the fresh target: PCSCF= when set — one address, it wins — else the first
entry of the list CanonicalIp6 accepts; the journal says which, and names
the entries it refused. imsd routes the P-CSCF it uses itself — the fresh
target before a fresh registration (BringUp, FreshRecover), the resumed SA
peer once its SAs are confirmed — with the same idempotent `ip -6 route
replace` as a call's media peer: the bring-up script routes only the configured
PCSCF=, so a target taken from PCSCF_DISCOVERED= (set by hand in this tree),
or a route lost with the PDN, had no route. The start line prints that target; a resume still follows the
kernel's SA peer and now says whether that peer is in today's list. With
neither variable and nothing to resume, the fatal names both.

Tested: crafter-build test, 8 passed; the configured, discovered, differing (the
discovered list's order flipped: the resume stays on the SA peer, the next
fresh registration's target is the other address) and empty arms in builds
of this series on the dev phone (KPN).
This commit is contained in:
Jorijn van der Graaf 2026-10-11 16:09:45 +02:00
commit bd52afd931
Signed by: jorijnvdgraaf
GPG key ID: 2937E59CDCC1BCFB
3 changed files with 105 additions and 43 deletions
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README.md
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@ -98,7 +98,8 @@ session and root may place, answer and end calls; an ssh login may not.
| Variable | Default | Meaning |
|---|---|---|
| `PCSCF` | *(none)* | P-CSCF address (IPv6), exactly one — not a comma-separated list — in RFC 5952 §4 form (lowercase, leading zeros dropped, the longest zero run compressed, no brackets — what `ip` prints for a plain IPv6 address; an IPv4-mapped address only as hex, `::ffff:a00:1` — the dotted spelling RFC 5952 §5 and `ip` use for it is refused); upper case, leading zeros, an uncompressed run or brackets are refused at start with the spelling to use (in the packaged unit the bring-up script refuses brackets first, with the rule), a dotted-quad tail with the rule; before 1.0.0 an upper-case, zero-padded or uncompressed `PCSCF=` matched no SA in `ip xfrm`'s text and registered fresh at every restart — an upgraded phone with such a setting stops at start with the spelling to use. It is where a fresh registration goes; a registration resumed from the kernel's SAs stays on the P-CSCF it was made to until its next fresh registration. Without it a fresh registration fails with a clear error |
| `PCSCF` | *(the first of `PCSCF_DISCOVERED`)* | P-CSCF address (IPv6), exactly one — not a comma-separated list — in RFC 5952 §4 form (lowercase, leading zeros dropped, the longest zero run compressed, no brackets — what `ip` prints for a plain IPv6 address; an IPv4-mapped address only as hex, `::ffff:a00:1` — the dotted spelling RFC 5952 §5 and `ip` use for it is refused); upper case, leading zeros, an uncompressed run or brackets are refused at start with the spelling to use (in the packaged unit the bring-up script refuses brackets first, with the rule), a dotted-quad tail with the rule; before 1.0.0 an upper-case, zero-padded or uncompressed `PCSCF=` matched no SA in `ip xfrm`'s text and registered fresh at every restart — an upgraded phone with such a setting stops at start with the spelling to use. Set, it wins over `PCSCF_DISCOVERED`. It is where a fresh registration goes; a registration resumed from the kernel's SAs stays on the P-CSCF it was made to until its next fresh registration. With neither this nor `PCSCF_DISCOVERED`, a fresh registration fails with a clear error |
| `PCSCF_DISCOVERED` | *(empty)* | a comma-separated IPv6 P-CSCF list, the first of which is used when `PCSCF` is unset; entries `CanonicalIp6` does not read — an IPv4 address, a name, an IPv6 literal with a zone or a dotted-quad tail (an IPv4-mapped entry in hex only) — are logged and ignored. imsd reads it from its environment; nothing in this tree writes it yet (a bench sets it in `/etc/imsd.env`) |
| `PCSCF_PORT` | `5060` | unprotected SIP port for the initial REGISTER |
| `DEV` | `qmapmux0.0` | ims-PDN netdev; the packaged service passes the real one via `/run/imsd.env` |
| `LOCAL` | *(auto)* | UE address (compared in RFC 5952 form). The packaged service gets the PDN address ModemManager assigned, via `/run/imsd.env` from `ims-pdn-up.sh`; a manual run prefers a global IPv6 on `DEV` that is neither temporary nor `dynamic` (RA-derived), then any non-temporary one, then the first (the kernel's temporary SLAAC address is listed first, and a registration bound to it is lost when the kernel retires it) |