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ims-pdn-up, imsd: register on the PDN's own address, not the kernel's temporary one

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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.
This commit is contained in:
Jorijn van der Graaf 2026-09-28 18:28:58 +02:00
commit 7eb2deae0c
Signed by: jorijnvdgraaf
GPG key ID: 2937E59CDCC1BCFB
6 changed files with 187 additions and 22 deletions
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8
tests/Ipsec/main.cpp
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@ -80,6 +80,14 @@ int main() {
}
// incomplete input -> nullopt
Check(!ParseExistingSa("src a dst b\n\tspi 0x1 reqid 1 mode transport\n", "", "b", "a").has_value(), "missing pieces -> nullopt");
{
// a registration still on another address of the link, plus an SA to
// another P-CSCF that is none of ours
std::string two = std::format("{}src 2001:db8:1111:2222:aaaa:bbbb:cccc:dddd dst 2001:db8::105\n\tproto esp spi 0x00000001 reqid 1 mode transport\nsrc 2001:db8:1111:2222:eeee:ffff:0:1 dst 2001:db8::999\n\tproto esp spi 0x00000002 reqid 1 mode transport\n", State);
auto locals = SaLocals(two, "2001:db8::105");
Check(locals.size() == 2 && locals[0] == "2001:db8:1111:2222:3333:4444:5555:db43" && locals[1] == "2001:db8:1111:2222:aaaa:bbbb:cccc:dddd", "SaLocals: every local address with an SA to the P-CSCF, once each, in kernel order");
Check(SaLocals(State, "2001:db8::999").empty(), "SaLocals: no SA to that P-CSCF -> none");
}
// ---- fresh setup command sequence
{