imsd: P-CSCF candidates from PCSCF_DISCOVERED when PCSCF= is not set
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).
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3 changed files with 105 additions and 43 deletions
79
AGENTS.md
79
AGENTS.md
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@ -79,8 +79,9 @@ partition with a test. The shell (`main.cpp`; from 1.0.0 also `pcscf.cpp`'s
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QRTR control lookup and its matching of answers by type, transaction and
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message id) holds protocol decisions no
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test reaches — some older than 0.3.10, some added by 0.3.10, 0.3.11, 0.3.12 or 1.0.0: the P-CSCF in
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use (`pcscf_`: the kernel's SA peer at a resume, `PCSCF=` at a fresh
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registration, the move between them and back — §7.2); the reg-event
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use (`pcscf_`: the kernel's SA peer at a resume, `PCSCF=` or the first of
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`PCSCF_DISCOVERED=` at a fresh registration, the move between them and back —
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§7.2); the reg-event
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subscription schedule (§7.4: its retry
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ladder, Retry-After clamp, Timer F, renewal point and RFC 6665 reasons); the
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registration sequence and its transactions (`AwaitFinal`/`AwaitInitialFinal`:
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@ -496,10 +497,14 @@ a 5-minute registration gate, connect retries). `Restart=on-failure`,
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The daemon's own bring-up (`BringUp()` in `main.cpp`):
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1. `PCSCF=` is where a fresh registration goes; a resume needs none — the
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kernel's SAs name its P-CSCF (step 3). With none set, a bring-up that did
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not resume fails with `no P-CSCF for a fresh registration: …`, and since
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no fresh one follows: a resumable pair whose attempt failed (a silent
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1. The P-CSCF a fresh registration goes to is `PCSCF=` when set, else the
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first address of `PCSCF_DISCOVERED=` (a comma-separated IPv6 list read
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from the environment; nothing in this tree writes it yet, so a bench sets
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it by hand); the journal says which (`pcscf: configured …` / `pcscf:
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discovered … (using …)`). A resume needs neither: the kernel's SAs name
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its P-CSCF (step 3). With neither, a bring-up that did not resume fails
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with `no P-CSCF for a fresh registration: …`, and since no fresh one
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follows: a resumable pair whose attempt failed (a silent
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connect, an unanswered refresh, a first refusal without a Retry-After —
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the refusal count goes to the holds) stays for the restart to resume, unless the engine's rule
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ends it — a 401, a refusal with a Retry-After or the second refusal
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@ -507,8 +512,7 @@ The daemon's own bring-up (`BringUp()` in `main.cpp`):
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refusal is the second) give the resume up, a 403 once a fresh registration
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is due or a binding a NOTIFY terminated under the attempt write the
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registration off (`old_gone`) — so the pair counts as one nothing can
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resume; a pair nothing can resume (its UE address left
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the link, no state file, a file another attempt left behind, written off before this start or by the engine during the attempt, `RESUME=0`) is taken out of the kernel first (`the SA pair to …
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resume; a pair nothing can resume (its UE address left the link, no state file, a file another attempt left behind, written off before this start or by the engine during the attempt, `RESUME=0`) is taken out of the kernel first (`the SA pair to …
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is nothing to resume: removing it` — by exact key, what two rules select — the fingerprinted policies and the reqid-1/2 transport-mode ESP states in their direction or on the UE's ims-PDN address, §12), so the next bring-up finds nothing to resume; the holds
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keep the Retry-After of a refusal and, for a registration the engine wrote
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off, the write-off — a removed pair needs none.
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@ -550,7 +554,8 @@ The daemon's own bring-up (`BringUp()` in `main.cpp`):
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registered fresh at every restart; an upgraded phone with such a setting
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stops at bring-up with the spelling to use. A resume follows the kernel's SA peer (`SaPeer`), not
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`PCSCF=`: a registration made to another P-CSCF than today's setting is
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resumed there (`pcscf: resuming on …`) and moves at the next fresh
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resumed there (`pcscf: resuming on …`; imsd routes that peer itself once
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`ParseExistingSa` confirms the SAs) and moves at the next fresh
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registration (`the fresh registration moves from P-CSCF X to Y`; an
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attempt that fails before the SA setup goes back while the old registration
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still stands — not written off by its address leaving the link, a NOTIFY
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@ -560,12 +565,13 @@ The daemon's own bring-up (`BringUp()` in `main.cpp`):
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`spi_uc`/`spi_us` against the pair's (`FileNamesAnotherPair`), a 0.3.x
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file's too: an attempt that got through the SA setup and did not live to
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record, to this or another P-CSCF — is not used; the
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bring-up registers fresh (with no fresh target: the fatal, step 1). Every fresh registration goes to `PCSCF=`; with
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none set, a bring-up that cannot resume fails with `no P-CSCF for a fresh
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registration: …` and a recovery step that needs one restarts the daemon
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through systemd.
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4. **Fresh registration** otherwise (`FRESH registration`): an unprotected
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REGISTER on `PCSCF_PORT` (UDP, always), the 401 with the AKA challenge and
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bring-up registers fresh (with no fresh target: the fatal, step 1). Every fresh registration goes to `PCSCF=`, else the first
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entry of `PCSCF_DISCOVERED=` that `CanonicalIp6` accepts; with neither, a bring-up that cannot resume fails
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with `no P-CSCF for a fresh registration: …` and a recovery step that
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needs one restarts the daemon through systemd.
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4. **Fresh registration** otherwise (`FRESH registration`): the target's host
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route (imsd's own `ip -6 route replace`; step 3 says which target), an
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unprotected REGISTER on `PCSCF_PORT` (UDP, always), the 401 with the AKA challenge and
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the `Security-Server` list, the AKA run over a UIM logical channel
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(`--uim-open-logical-channel`, `--uim-send-apdu`), the SA pair installed
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with `ip xfrm`, the protected REGISTER over the negotiated transport
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@ -674,9 +680,9 @@ configures the muxed netdev. Idempotent; a non-zero exit fails the unit.
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uncompressed one by the daemon with the spelling to use once the route
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step took it); anything else on the IMS
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network (its DNS servers, a traceroute target) needs its own host route
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(`ip -6 route add <addr> dev qmapmux0.0`). imsd installs a host route per
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media peer itself, and one to the SA peer of a registration it resumes
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when that differs from the fresh target (§7.2).
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(`ip -6 route add <addr> dev qmapmux0.0`). imsd installs a host route
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per media peer itself, and one to the P-CSCF it registers to or resumes on
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(§7.2 step 3).
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- Opens imsd's protected ports 45061–45062 (TCP and UDP) on `qmapmux*` in
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nftables when a `inet filter` table exists (pmOS's default INPUT chain drops
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inbound on `qmapmux*`, which silently killed every network-initiated
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@ -930,16 +936,20 @@ Lines the operator (and the scripts) look for, all prefixed `imsd: `:
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until the next fresh attempt`, `X has left DEV: the registration on it is
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gone; staying on Y; next: …`, `X is no longer on DEV: the registration on
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it is gone; on the PDN's own address Y now; next: …`.
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- `pcscf: resuming on X, the registration's SA peer; the configured P-CSCF
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is Y — the next fresh registration moves there` (or `… (no P-CSCF
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configured)`), `the fresh registration moves from P-CSCF X to Y`, `back to
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P-CSCF X: the old registration stands until the next fresh attempt`,
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`no reg state file; resume falls back to fresh` and `the state file names
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- `pcscf: configured X` / `pcscf: configured X; discovery gave Y, Z (ignored:
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PCSCF= wins)` / `pcscf: discovered Y, Z (using Y)` at start, `pcscf:
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PCSCF_DISCOVERED entry '…' is not an IPv6 address; ignored`; `pcscf:
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resuming on X, the registration's SA peer; the next fresh registration
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goes to Y` (+ ` (the peer is not in today's list)`, or `… (no P-CSCF
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configured or discovered)`), `the fresh registration moves from P-CSCF X
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to Y`, `back to P-CSCF X: the old registration stands until the next fresh
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attempt`, `no reg state file; resume falls back to fresh` and `the state file names
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another SA pair (0x…/0x…[ to X]) than the kernel's (0x…/0x… to Y): another
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attempt's; resume falls back to fresh` (` to X` only when the file records a
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P-CSCF — a pre-1.0.0 file does not; with no fresh target both end in
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`nothing can resume it: the pair is removed` instead), `no P-CSCF for a fresh
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registration: none configured (PCSCF=)`.
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`nothing can resume it: the pair is removed` instead), `no P-CSCF for a
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fresh registration: none configured (PCSCF=) and none discovered
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(PCSCF_DISCOVERED empty)`.
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- `PCSCF='…' is not written as ip prints it; use PCSCF=…` (under `bring-up
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FAILED:`) — one accepted spelling of the setting (§7.2 step 3); the
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bring-up script's `ims-pdn-up: PCSCF '…': write the bare address, as ip
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@ -1184,7 +1194,19 @@ minimum `/etc/imsd.env` are in the README.
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The README's first table. The protected client/server ports are fixed at
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45061/45062 (`imsd::util::PortUc`/`PortUs`) — changing them in source also
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requires updating the firewall rules `ims-pdn-up.sh` installs.
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requires updating the firewall rules `ims-pdn-up.sh` installs. `PCSCF` and
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`PCSCF_DISCOVERED` are read at start (`FreshPcscfFromEnv`, for the start line
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and again by the engine): the first is one address in RFC 5952 form (§7.2 step 3: another spelling is
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refused at bring-up), and wins, the second a comma-separated IPv6 list whose
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first entry `CanonicalIp6` accepts is the fresh target otherwise (an IPv4
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address, a name, a literal with a zone or a dotted-quad tail is logged and
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skipped). A resume goes to the kernel's SA
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peer whatever they say (and routes it itself); beyond the resume's `pcscf:`
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line, having a fresh target decides what a refused or failed resume
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leads to — the fresh registration (a refusal without a Retry-After is not
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counted) or, with none, the pair kept for the restart or removed (§7.2
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step 1) — and a comma-separated `PCSCF=` stops the bring-up before the
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resume.
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### 10.2 imsd-media (per call, set through imsd's environment)
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@ -1272,9 +1294,8 @@ only the imsd side of its bus choice.
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(`DUMP_SIP=0`), and never leave the phone in a commit.
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- The ims PDN is a walled garden: `ims-pdn-up.sh` keeps it from becoming
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the default route and gives the P-CSCF a host route; imsd adds one per
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call for the media peer (§7.3) and, at a resume, one for the registration's
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SA peer when that differs from the fresh target (§7.2: the script routed
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only the configured address). Nothing else is routed over it.
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call for the media peer (§7.3) and one for the P-CSCF it registers to or resumes on (§7.2 step 3; the
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script routes only the configured address). Nothing else is routed over it.
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A change that routes anything else over it needs a reason and a bench.
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- The fixed protected ports (45061/45062) are opened in nftables for
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`qmapmux*` only, by the bring-up script.
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@ -98,7 +98,8 @@ session and root may place, answer and end calls; an ssh login may not.
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| Variable | Default | Meaning |
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|---|---|---|
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| `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 |
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| `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 |
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| `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`) |
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| `PCSCF_PORT` | `5060` | unprotected SIP port for the initial REGISTER |
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| `DEV` | `qmapmux0.0` | ims-PDN netdev; the packaged service passes the real one via `/run/imsd.env` |
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| `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) |
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@ -295,6 +295,20 @@ void LogAudioSession() {
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Log(AudioSessionLine(s) + (s.name.empty() ? "; looked up again at each call, set AUDIO_USER to pin one" : ""));
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}
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// The P-CSCF a fresh registration goes to, from the environment: PCSCF=
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// when set (one address, any spelling — a list is left as it came and
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// refused at bring-up), else the first address of PCSCF_DISCOVERED=, the
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// list the bring-up read from the PDN's PCO (comma-separated IPv6, PCO
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// order). `discovered` and `rejected` get the list and what was not an
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// IPv6 literal, for the caller's log lines.
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std::string FreshPcscfFromEnv(std::vector<std::string>* discovered = nullptr, std::vector<std::string>* rejected = nullptr) {
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std::string configured = imsd::util::CanonicalAddr(EnvOr("PCSCF", ""));
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std::vector<std::string> list = imsd::util::ParseAddressList(EnvOr("PCSCF_DISCOVERED", ""), rejected);
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if (discovered) *discovered = list;
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if (!configured.empty()) return configured;
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return list.empty() ? std::string() : list.front();
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}
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// ---- sockaddr helper ------------------------------------------------------
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socklen_t MakeAddr(std::string_view ip, int port, sockaddr_storage& ss) {
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std::memset(&ss, 0, sizeof ss);
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@ -942,11 +956,25 @@ void PostEvent(std::unique_ptr<Event> ev) {
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class Engine {
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public:
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Engine() {
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// The P-CSCF a fresh registration goes to: PCSCF= (no baked-in
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// default — carrier infrastructure). A resume follows the kernel's
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// SAs instead (TryResume), whatever this says today.
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pcscfTarget_ = imsd::util::CanonicalAddr(EnvOr("PCSCF", ""));
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// The P-CSCF a fresh registration goes to: PCSCF= when set, else the
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// first address the bring-up read from the PDN's PCO
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// (PCSCF_DISCOVERED=); no baked-in default — carrier infrastructure.
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// A resume follows the kernel's SAs instead (TryResume), whatever
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// this says today.
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{
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std::vector<std::string> rejected;
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pcscfTarget_ = FreshPcscfFromEnv(&pcscfCandidates_, &rejected);
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pcscf_ = pcscfTarget_;
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std::string configured = imsd::util::CanonicalAddr(EnvOr("PCSCF", ""));
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std::string list;
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for (const std::string& c : pcscfCandidates_) list += (list.empty() ? "" : ", ") + c;
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if (!configured.empty())
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Log(pcscfCandidates_.empty() ? std::format("pcscf: configured {}", configured)
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: std::format("pcscf: configured {}; discovery gave {} (ignored: PCSCF= wins)", configured, list));
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else if (!pcscfCandidates_.empty())
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Log(std::format("pcscf: discovered {} (using {})", list, pcscfTarget_));
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for (const std::string& r : rejected) Log(std::format("pcscf: PCSCF_DISCOVERED entry '{}' is not an IPv6 address; ignored", r));
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}
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pcscfPort_ = std::atoi(EnvOr("PCSCF_PORT", "5060").c_str());
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dev_ = EnvOr("DEV", "qmapmux0.0");
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outDir_ = EnvOr("OUT_DIR", StateDir());
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@ -1156,13 +1184,15 @@ private:
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// config
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std::string pcscf_, dev_, outDir_, local_, ealgOffer_, mediaBin_;
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// The P-CSCF a fresh registration goes to (PCSCF=). pcscf_ is the one in
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// The P-CSCF a fresh registration goes to (PCSCF=, else the first of
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// PCSCF_DISCOVERED=) and the whole discovered list. pcscf_ is the one in
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// use: the same, or the kernel's SA peer while a resumed registration
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// made to another one lives (TryResume) — the next fresh registration
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// moves to the target, and back when it fails before the SA setup
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// (FreshRecover), as local_ does against pdnLocal_.
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std::string pcscfTarget_;
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static constexpr std::string_view NoFreshPcscf = "no P-CSCF for a fresh registration: none configured (PCSCF=)";
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std::vector<std::string> pcscfCandidates_;
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static constexpr std::string_view NoFreshPcscf = "no P-CSCF for a fresh registration: none configured (PCSCF=) and none discovered (PCSCF_DISCOVERED empty)";
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// The PDN's own address (LOCAL, else DetectLocal) — every fresh
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// registration's. local_ differs from it only while a resume runs on the
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// address an older registration was made on (TryResume).
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@ -1352,6 +1382,11 @@ private:
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local_ = pdnLocal_; ctx_.local = local_;
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KeepHolds();
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pcscf_ = pcscfTarget_;
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// the target's host route is imsd's own: the bring-up script routes only
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// the configured address (§7.2 step 3), not a target set in /etc/imsd.env
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// as PCSCF_DISCOVERED= nor a route lost with the PDN — the same idempotent
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// replace as a media peer's
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RunCmd({"ip", Is6(pcscf_) ? "-6" : "-4", "route", "replace", pcscf_, "dev", dev_});
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if (recovery_.Next(Boot()).at > Boot()) Log(std::format("the network's hold stands; {}", NextStep()));
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if (!WaitForPolicy()) throw Stopping{};
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FreshRegister();
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@ -1373,13 +1408,12 @@ private:
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// the replace covers a target that changed under a running phone.
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auto peer = imsd::ipsec::SaPeer(policy.out);
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if (!peer) return ResumeOutcome::None;
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bool routePeer = false;
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if (*peer != pcscf_) {
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bool listed = *peer == pcscfTarget_ || std::ranges::find(pcscfCandidates_, *peer) != pcscfCandidates_.end();
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Log(pcscfTarget_.empty()
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? std::format("pcscf: resuming on {}, the registration's SA peer (no P-CSCF configured)", *peer)
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: std::format("pcscf: resuming on {}, the registration's SA peer; the configured P-CSCF is {} — the next fresh registration moves there", *peer, pcscfTarget_));
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? std::format("pcscf: resuming on {}, the registration's SA peer (no P-CSCF configured or discovered)", *peer)
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: std::format("pcscf: resuming on {}, the registration's SA peer; the next fresh registration goes to {}{}", *peer, pcscfTarget_, listed ? "" : " (the peer is not in today's list)"));
|
||||
pcscf_ = *peer;
|
||||
routePeer = true; // routed below, once the SAs are confirmed: a peer named by a pair that is not ours gets no route into the PDN
|
||||
}
|
||||
auto sa = imsd::ipsec::ParseExistingSa(state.out, policy.out, pcscf_, local_);
|
||||
// The registration may sit on another address of the link: before
|
||||
|
|
@ -1403,7 +1437,10 @@ private:
|
|||
}
|
||||
}
|
||||
if (!sa) { Log(std::format("the SA pair to {} has no SA on an address of {}: nothing to resume", pcscf_, dev_)); return ResumeOutcome::Dead; }
|
||||
if (routePeer) RunCmd({"ip", Is6(pcscf_) ? "-6" : "-4", "route", "replace", pcscf_, "dev", dev_});
|
||||
// the peer's host route is imsd's own once the SAs are confirmed (a peer
|
||||
// named by a pair that is not ours gets no route into the PDN), whether
|
||||
// or not the bring-up script routed the same address — idempotent
|
||||
RunCmd({"ip", Is6(pcscf_) ? "-6" : "-4", "route", "replace", pcscf_, "dev", dev_});
|
||||
auto ps = LoadState();
|
||||
if (!ps || !ps->callid) { Log(std::format("no reg state file; {}", ResumeDeadNext())); return ResumeOutcome::Dead; }
|
||||
// A file another attempt left behind — one that got through the SA
|
||||
|
|
@ -2046,6 +2083,8 @@ private:
|
|||
Log(std::format("the fresh registration moves from {} to the PDN's own address {}", local_, pdnLocal_));
|
||||
MoveTo(pdnLocal_);
|
||||
}
|
||||
// the fresh target's host route, imsd's own (BringUp's fresh path does the same)
|
||||
RunCmd({"ip", Is6(pcscf_) ? "-6" : "-4", "route", "replace", pcscf_, "dev", dev_});
|
||||
bool ok = false;
|
||||
try {
|
||||
RefreshPani();
|
||||
|
|
@ -2680,7 +2719,8 @@ int main(int argc, char** argv) {
|
|||
return 1;
|
||||
}
|
||||
local = imsd::util::CanonicalAddr(local);
|
||||
Log(std::format("LOCAL={} P-CSCF=[{}]:{}", local, imsd::util::CanonicalAddr(EnvOr("PCSCF", "(unset)")), EnvOr("PCSCF_PORT", "5060")));
|
||||
std::string freshPcscf = FreshPcscfFromEnv();
|
||||
Log(std::format("LOCAL={} P-CSCF=[{}]:{}", local, freshPcscf.empty() ? "(none)" : freshPcscf, EnvOr("PCSCF_PORT", "5060")));
|
||||
if (!session) LogAudioSession();
|
||||
imsd::bus::AuthorizeCalls = !session;
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue