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qmi, imsd-pcscf: read the ims PDN's P-CSCF list from the modem's runtime settings

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The network hands the P-CSCF addresses to the modem in the PDN's Protocol
Configuration Options; ModemManager's bearer code does not ask the modem
for them, qmicli (libqmi 1.39) prints none of them, and libqmi has no TLV
for the IPv6 list (0x2E), which is why PCSCF= was a required setting. A
second QMI WDS client reads them once it is bound to the bearer's mux
data port (the binding ModemManager gives its own clients): Bind Mux
Data Port, Set IP Family 6, Get Current Settings, over one AF_QIPCRTR
socket. Imsd:Qmi holds the bytes and the readers (0x22 the flag, 0x23
IPv4, 0x24 FQDN, 0x2E IPv6 in Qualcomm's layout: a count, then 16 bytes
each); imsd-pcscf is the socket, the service lookup and the sequence, and
prints the list, one address per line; nothing runs it yet. It sends
no Start Network and no Stop Network; the bearer stayed connected and the
registration stood after its runs (the fp6 journal's probe capture 04,
benches 38 and 39). The
build, the CI cross-compile, the tarball and the apk gain the product;
linux-headers is named in the sysroot for <linux/qrtr.h>.

Tested: crafter-build test, 8 passed; the aarch64 build of this commit's
helper on the dev phone (KPN) against the live ims bearer.
This commit is contained in:
Jorijn van der Graaf 2026-10-11 16:07:28 +02:00
commit a89ca5a60c
Signed by: jorijnvdgraaf
GPG key ID: 2937E59CDCC1BCFB
10 changed files with 701 additions and 25 deletions
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9
packaging/make-sysroot.sh
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@ -4,7 +4,8 @@
# make-sysroot.sh — build an Alpine aarch64 sysroot for cross-compiling imsd.
#
# Downloads apk-tools-static + the Alpine signing keys from the CDN and
# populates a minimal rootfs (musl, libc++, glib and their headers) that
# populates a minimal rootfs (musl, libc++, glib and their headers, the Linux
# UAPI headers) that
# clang can use via --sysroot. No root, no qemu, no device needed:
#
# packaging/make-sysroot.sh [dir] # default: ~/.cache/imsd/sysroot-aarch64-alpine
@ -22,8 +23,10 @@ ARCH=aarch64
# none): crafter-build compiles the sysroot's own copy first. --upgrade below
# is for a run over an existing sysroot: added alone beside libc++ 22,
# llvm-runtimes 23's source did not compile against its headers; upgraded
# with it, it did.
PKGS="musl-dev libc++ libc++-dev llvm-runtimes glib-dev compiler-rt llvm-libunwind-dev gcc"
# with it, it did. linux-headers is in it for <linux/qrtr.h>, which
# imsd-pcscf's QRTR socket needs (the sysroot had it only as another
# package's dependency before).
PKGS="musl-dev libc++ libc++-dev llvm-runtimes glib-dev compiler-rt llvm-libunwind-dev gcc linux-headers"
work=$(mktemp -d)
trap 'rm -rf "$work"' EXIT