2026-07-22 22:53:28 +02:00
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# SPDX-License-Identifier: GPL-3.0-only
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# SPDX-FileCopyrightText: Copyright (C) 2026 Catcrafts®
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[Unit]
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Description=Userspace IMS/VoLTE daemon (SIP register + calls over the ims PDN)
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# needs the ims PDN (multiplexed netdev + global v6) — ims-pdn-up.sh
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# creates/connects the bearer through ModemManager and configures the netdev
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After=ModemManager.service network.target
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Wants=ModemManager.service
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[Service]
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Type=simple
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2026-09-01 18:10:04 +02:00
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# bring up the ims PDN first; waits for modem + network registration,
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# idempotent. worst case ~14 min (2 min modem wait + 5 min registration
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# gate + connect retries), hence TimeoutStartSec
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2026-07-22 22:53:28 +02:00
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ExecStartPre=/usr/libexec/ims-pdn-up.sh
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packaging: restart imsd and imsd-ofonod on upgrade
An upgrade left the old imsd and imsd-ofonod running until they were
next restarted, while a changed bus policy is live the moment apk writes
it: dbus-broker-launch reloads on its own. A policy that relies on a
check inside the daemons would face the old daemons in between.
Mark imsd.service and imsd-ofonod.service needs-restart in post-upgrade
scripts; the systemd trigger restarts them once the transaction is done
(enqueue-marked). A call in progress ends. The same scripts run as
post-install: `apk del` removes a package's files and leaves its daemon
running, so a later `apk add` of the package is this upgrade for that
daemon — and apk runs the post-install script, not post-upgrade, for a
package it adds. GNOME Calls 50.0 dials nothing after imsd-ofonod
restarts under it until it restarts too, so imsd-ofonod's ExecStartPost
restarts the Calls daemon of each user running one — not at the unit's
first start since boot, when a Calls that runs already is left alone.
A daemon older than 0.3.10 kept its bring-up throttle wait in memory
only, so a restart lost it. imsd's post-upgrade records that daemon's
invocation, and imsd-handover.sh, an ExecStartPre after ims-pdn-up.sh,
reads the invocation's journal and, while the fresh-SA throttle's wait
it finds there still runs (`spi-s=0`; the old daemon's other deferrals
are not handed over), writes what is left of it to the holds file when
this start's LOCAL is the address the wait was earned on, or when that
address cannot be read; when LOCAL is another address, only the verdict
that the old registration is gone.
Tested on the dev phone (KPN) in builds of this series; not every path
has run there.
2026-10-04 00:09:37 +02:00
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# a daemon older than 0.3.10 that an upgrade restarted inside its bring-up
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# throttle wait: the wait — on another address only the verdict that its
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# registration is gone — is handed over from its journal now that it has
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# stopped (imsd.post-upgrade recorded the invocation in /run/imsd.handover)
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ExecStartPre=-/usr/libexec/imsd-handover.sh
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2026-09-01 18:10:04 +02:00
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TimeoutStartSec=900
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ims-pdn-up, imsd: register on the PDN's own address, not the kernel's temporary one
imsd took the first global IPv6 on the ims netdev as its address, and
the kernel lists the temporary (privacy) SLAAC address first: `temporary
dynamic`, preferred for a day and valid for two by its lifetimes (read
2026-09-24). Contact, Via and the four SAs were bound to it, so once the
kernel removes it the registration has lost its address. The address
ModemManager assigned — the one the script installs — sat third on the
list. Seen on the dev phone; a field unit's journal shows the split too
— imsd registered on an address other than the one the script installed
(ims ledger F18).
Hand the assigned address to the daemon as LOCAL through /run/imsd.env,
next to DEV. For a manual run without it, prefer a global address that
is neither `temporary` nor `dynamic`, then any non-temporary one.
A restart after the upgrade finds the registration's SAs on the old
address. It resumes there while that address is still on the link, and
moves to the PDN's address in place: with its next fresh registration,
or when the old address leaves the link first. When the address it is
registered on leaves the netdev and the PDN's own address is not there
to move to, a registered imsd exits at its next recovery step, non-zero,
for a systemd restart, which runs the PDN bring-up again.
Tested on the dev phone (KPN) in builds of this series; not every path
has run there.
2026-09-28 18:28:58 +02:00
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# /run/imsd.env: written by ims-pdn-up.sh (DEV= the connected ims netdev,
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ims-pdn-up: discover the P-CSCF list once the PDN is up and hand it to imsd
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.
2026-10-11 16:16:46 +02:00
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# LOCAL= the PDN address ModemManager assigned to it, PCSCF_DISCOVERED= the
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packaging, ims-pdn-up, imsd, README: imsd runs without /etc/imsd.env and idles without a SIM
With the P-CSCF coming from the PDN's PCO, the configuration file has no
required line left, so the apk's ConditionPathExists=/etc/imsd.env drop-in
goes: the unit starts on every phone with the package, and VoLTE is on by
default. Installing the package and inserting a SIM is the opt-in; the file
holds overrides only, and its existence changes nothing. By the versioning
rule (AGENTS §11, the first commit of this series) that is what moves the
major number: the release is 1.0.0, and §11 now records it. What used to be the
file's job — keeping a phone nobody configured out of a failing unit — is now
a rule on facts, the same for every phone: a modem in the failed state with
a SIM reason makes the script write IMSD_IDLE=no-sim to /run/imsd.env and
exit 0; a profile-indexed connect series the network refuses ten times in a
row — each a persistent 3GPP cause in ModemManager's typed error (not
subscribed, unknown APN, barred, not authorised in the PLMN, authentication
failed, the service option not supported, the wrong PDN type) with packet
service at the time; counted only while the modem reads registered,
connecting or connected with packet service not detached — stricter than
the daemon's PacketServiceUp; any other read, a timeout or a transient cause
starts the count again — writes IMSD_IDLE=no-ims-pdn; and a bring-up that
ends with no P-CSCF — none configured, none discovered: no IPv6 P-CSCF read
from the PCO (PCSCF_DISCOVERY=none in the hand-off, the reader's exit 2: the
list absent, empty, unreadable or IPv4/FQDN only), discovery skipped (no
rmnet mux id) or no hand-off at all (a manual run) — and no registration of
imsd's own to resume is the daemon's own idle, decided before it takes the bus name (SaPeer and the
holds' old_gone say what can be resumed; a pair the holds wrote off is taken
out of the kernel there) and at the no-target bring-up, where a pair nothing
can resume is written off and taken out of the kernel first. imsd reads the key, logs idle: … and exits 0, which Restart=on-failure
leaves alone, so the unit stays inactive until the next boot, a systemctl
start or a start of imsd-ofonod where that runs (its Wants starts an idle
imsd again). What is not a fact keeps the retry: no coverage, a SIM still
waiting for its PIN, a modem without an ims profile (the APN-string connect
is tried), an APN-string series (the modem's own wall), a resumable pair
whose attempt failed (the fatal), and a P-CSCF reader that did not answer
(PCSCF_DISCOVERY=failed: the daemon exits 1 and the restart runs discovery
again). A phone that never had the file keeps its stopped unit through the
upgrade and starts at its next boot, registering where the rule above lets
it — at the upgrade itself where imsd-ofonod runs, whose restart pulls imsd
in through its Wants (systemd queues the marked unit's try-restart, collapses
it to a restart and starts what the unit Wants in the same transaction:
job_type_collapse, transaction_add_job_and_dependencies, 262~rc3); the
opt-out is systemctl mask --now imsd, since a plain disable is undone by
that Wants. imsd-ofonod.service loses its After=imsd.service: with imsd
starting on every phone, GNOME Calls' backend would otherwise wait behind
the ims PDN bring-up at every boot and at its marked restart at an upgrade,
for the whole bring-up (up to its TimeoutStartSec=900); it starts at once and republishes when imsd's name
appears (OnImsdAppeared).
The configuration file's path is the IMSD_ENV seam the mock bench uses.
AGENTS §6's lint figures are this tree's (109 findings in 16 of 20 files,
2026-10-13; the 72 of 2026-10-06 predate the Qmi files).
Tested: crafter-build test, 8 passed; on the host build the daemon's idle
exit for the script's keys and, with no pair, for every discovery verdict
but failed (none, skipped, no hand-off) — exit 0 — and the exit 1 for
failed; the script's arms on the mock bench; on the dev phone (KPN), in
builds of this series: the daemon's idle at the no-target bring-up with the
dead pair removed and before the bus name for a pair the holds had written
off, the discovery-failed exit 1 and its restart, the start without the file, the pull-in by an imsd-ofonod restart
and the mask holding against it and a reboot, and imsd-ofonod starting at
once with imsd stopped and republishing when imsd's name appeared.
2026-10-11 16:20:07 +02:00
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# P-CSCF list the network put in the PDN's PCO, read from the modem,
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# PCSCF_DISCOVERY= how that list came to be: found, none, failed, skipped;
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# or IMSD_IDLE=<reason> alone when the bring-up found nothing to do).
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ims-pdn-up: discover the P-CSCF list once the PDN is up and hand it to imsd
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.
2026-10-11 16:16:46 +02:00
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# /etc/imsd.env: admin configuration, none required where discovery finds a
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# P-CSCF (AGENTS.md §10, the README); it wins over the runtime-derived values
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# — PCSCF= overrides discovery.
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2026-07-22 22:53:28 +02:00
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EnvironmentFile=-/run/imsd.env
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EnvironmentFile=-/etc/imsd.env
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# registration state (imsreg.state) + media stats live here
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StateDirectory=imsd
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ExecStart=/usr/bin/imsd
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# registration: resume an existing SA when possible (avoids fresh-SA
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ims-pdn-up, imsd: register on the PDN's own address, not the kernel's temporary one
imsd took the first global IPv6 on the ims netdev as its address, and
the kernel lists the temporary (privacy) SLAAC address first: `temporary
dynamic`, preferred for a day and valid for two by its lifetimes (read
2026-09-24). Contact, Via and the four SAs were bound to it, so once the
kernel removes it the registration has lost its address. The address
ModemManager assigned — the one the script installs — sat third on the
list. Seen on the dev phone; a field unit's journal shows the split too
— imsd registered on an address other than the one the script installed
(ims ledger F18).
Hand the assigned address to the daemon as LOCAL through /run/imsd.env,
next to DEV. For a manual run without it, prefer a global address that
is neither `temporary` nor `dynamic`, then any non-temporary one.
A restart after the upgrade finds the registration's SAs on the old
address. It resumes there while that address is still on the link, and
moves to the PDN's address in place: with its next fresh registration,
or when the old address leaves the link first. When the address it is
registered on leaves the netdev and the PDN's own address is not there
to move to, a registered imsd exits at its next recovery step, non-zero,
for a systemd restart, which runs the PDN bring-up again.
Tested on the dev phone (KPN) in builds of this series; not every path
has run there.
2026-09-28 18:28:58 +02:00
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# throttles); a failed bring-up exits nonzero and systemd retries, as does
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# a registered imsd whose PDN address left the netdev
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2026-07-22 22:53:28 +02:00
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Restart=on-failure
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RestartSec=120
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# SIGTERM: engine keeps the SA + registration state for the next resume
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KillMode=mixed
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TimeoutStopSec=10
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[Install]
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WantedBy=multi-user.target
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