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ims-pdn-up: discover the P-CSCF list once the PDN is up and hand it to imsd

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With the netdev configured, the script runs imsd-pcscf against the
netdev's rmnet mux id (and the ims profile index when it knows one) and
hands the IPv6 addresses it prints to imsd as PCSCF_DISCOVERED= in
/run/imsd.env and gives the first — the daemon's fresh target — a host
route (the SA peer of a registration imsd resumes is routed by imsd itself,
as the configured address's arm already left it); IPv4 addresses and names
are logged and dropped (the PDN is IPv6-only), at most eight are handed
over, and nothing usable is logged with its cause and is not the
script's failure: imsd resumes a registration of its own when it can, else
says so and exits, and the restart runs discovery again. PCSCF= still wins and skips discovery; a list in it is refused.
The script does not read the variable from its environment: the unit
hands it the previous run's file, and a stale discovered value must not
pass for the admin's setting. The reader's path is the IMSD_PCSCF seam
the mock bench uses.

Tested: on the mock bench against this commit's script (the twelve 0.3.10
scenarios; this step's discovery arms S13–S17 and S19–S22, with S18 the
pre-existing non-IPv6 refusal; S55, the reader's rc-0 answer without an
address), and in builds of this series on the dev phone (KPN), whose PCO —
two IPv6 addresses, nothing else — reaches the plain found arm; the
configured skip, the bracketed refusal and, through the IMSD_PCSCF seam, the
reader's failure and its exit 2 ran on the phone too; the v4/FQDN line, the
eight-address cap, the IPv4-only and no-mux-id skips, the comma-list refusal
and the rc-0 arm on the mock only. On a tip build of this series (daemon
2ec1a02f62831edb; bench 40, 2026-10-13) a fresh registration reached a target
this script had not routed — the reader stubbed through the IMSD_PCSCF seam to
find none, the address in /etc/imsd.env as PCSCF_DISCOVERED= — over imsd's own
route, and a resume stood with the peer's route removed first.
This commit is contained in:
Jorijn van der Graaf 2026-10-11 16:16:46 +02:00
commit 1d28063700
Signed by: jorijnvdgraaf
GPG key ID: 2937E59CDCC1BCFB
6 changed files with 186 additions and 86 deletions
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9
packaging/imsd.service
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@ -20,10 +20,11 @@ ExecStartPre=/usr/libexec/ims-pdn-up.sh
ExecStartPre=-/usr/libexec/imsd-handover.sh
TimeoutStartSec=900
# /run/imsd.env: written by ims-pdn-up.sh (DEV= the connected ims netdev,
# LOCAL= the PDN address ModemManager assigned to it).
# /etc/imsd.env: admin configuration — PCSCF= is REQUIRED (the carrier's
# P-CSCF address; see AGENTS.md §10, or the README) and wins over the
# runtime-derived values.
# LOCAL= the PDN address ModemManager assigned to it, PCSCF_DISCOVERED= the
# P-CSCF list the network put in the PDN's PCO, read from the modem).
# /etc/imsd.env: admin configuration, none required where discovery finds a
# P-CSCF (AGENTS.md §10, the README); it wins over the runtime-derived values
# — PCSCF= overrides discovery.
EnvironmentFile=-/run/imsd.env
EnvironmentFile=-/etc/imsd.env
# registration state (imsreg.state) + media stats live here