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lgcosta
dff2185b20
- Demo docs replaced by the screencast docs (single source of truth): the legacy demo-session.sh/demo-record.py and the v0.9 renderer were removed instead of being kept as a second convention. - feature-matrix: stale 'M2-in-progress' vocabulary gone; the rows the 15 gates prove now say VERIFIED-in-VM and name the gate; af-to is now an explicit non-goal row (INET6 0 in this build). - guide: the queues/divert/pflog sections described a state that no longer exists (priq-only, divert dropping packets, pflog logging nothing); they now describe the shipped behaviour. - vm-lab: the 15 real gates with what each proves, 15/15 green, and the pf0 -> cli/srv/gw2 ssh setup the screencasts rely on. - install/build: pdivert and pflogd are built and ported (docs said otherwise); module object list now includes hfsc.c, fq_codel.c, pfk_pflog.c; the screencast pipeline is an optional build stage. - pf-guide: the 'M2 scope only' framing is gone; honest gaps listed. - caveats: three new sections about the screencast pipeline (MiniMax video generation blocked by the account tier, narration as a separate track, a video frame is not a verdict). - porting-notes: what the recording taught us. - README/README.pt-BR: status, milestones, layout and video section updated. All internal doc links verified.
102 lines
5.7 KiB
Markdown
102 lines
5.7 KiB
Markdown
# PF on Linux
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Port of the OpenBSD **PF** (packet filter) to **Linux 7.3.4** as an
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out-of-tree kernel module — the real PF engine (`pf.c`, `pf_norm.c`,
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`pf_table.c`, `pf_lb.c`, `hfsc.c`, … ported from OpenBSD 8.0 sources) driven by
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the real OpenBSD `pfctl` over the `/dev/pf` ioctl ABI.
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**Status:** the filter core, stateful filtering, tables, anchors, NAT
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(`nat-to`/`rdr-to`/`binat-to`), forced routing (`route-to`/`dup-to`/`reply-to`),
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pools, `divert`, `pflog` and the OpenBSD 8.0 **queues (HFSC)** are **verified
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in a real libvirt lab** — 15/15 gates green. What is still pending is stated
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per feature in [`docs/en/feature-matrix.md`](docs/en/feature-matrix.md).
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Screencasts (EN + PT, narrated): [`docs/en/screencast.md`](docs/en/screencast.md).
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Design: [`docs/superpowers/specs/2026-11-11-pf-linux-port-design.md`](docs/superpowers/specs/2026-11-11-pf-linux-port-design.md)
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· plan: [`docs/superpowers/plans/2026-11-11-pf-linux-port.md`](docs/superpowers/plans/2026-11-11-pf-linux-port.md).
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## Milestones
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| Milestone | Scope | Status |
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|---|---|---|
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| M0 | repo, scripts, kernel build, VM boots the custom kernel | done |
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| M1 | compat layer, `pf.ko` loads, `/dev/pf`, `pfctl -f` / `-s info` | done |
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| M2 | filter core: rules/states/tables/anchors, VM gates 01–04 | **done** — gates 01/02/03/04 green |
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| M3 | NAT (`nat-to`/`rdr-to`/`binat-to`), scrub | **done** — gates 05/06/07/09 (incl. 2 MB integrity through a redirect, min-ttl/max-mss measured) |
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| M4 | route-to/dup-to/reply-to, pools, divert e2e, pflog | **done** — divert (11), pflog (12), route-to/dup-to (08), pools (10), reply-to (13) verified |
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| M5 | queues: HFSC back end in the data path | **done (mechanical)** — gate 15: queues load, hfsc attaches, `pfctl -s queue -v` reports class stats, a 2 MB queued flow is counted by the class. `bandwidth` = HFSC linkshare (guarantee, not cap; 8.0 has no upperlimit syntax) |
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| M6 | docs complete, patchset tidy, full suite green, tagged release | **done** — docs EN+PT-BR, 15/15 suite green, tagged (`v1.0.0`) |
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## What you get
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| Area | Feature |
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|---|---|
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| Filtering | rules, anchors, quick, `match`/`block`(drop/return/return-rst)/`pass`, `keep state`, syncookies |
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| State/Tables | stateful firewall engine, `pfr` tables (radix + hash, `pfctl -t`) |
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| NAT | `nat-to` (port pools, sticky-port, static-port), `rdr-to`, `binat-to` |
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| Scrub | fragment reassembly, overlap drop, `min-ttl`/`max-mss`/`df`/`no-df`, `set reassemble` |
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| QoS (ALTQ successor) | `queue`/`queue on` with OpenBSD 8.0 `ifq` schedulers: **HFSC verified in the data path** (gate 15), priq default, FQ-CoDel compiled; `pfctl -s queue -v` works |
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| Divert | `divert-to` / `divert` tag + `pdivert` relay over an in-module `PF_DIVERT` socket family (verified: packet to userspace and back) |
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| Route | `route-to`/`dup-to`/`reply-to` + pools (`round-robin`, `source-hash`) verified (`fail-to` no longer exists in OpenBSD 8.0) |
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| Logging | `pflogd` via `/dev/pflog` (DLT_PFLOG pcap, OpenBSD record layout) — verified |
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| Control | `/dev/pf` (0600), OpenBSD 8.0 ioctl ABI, Linux build of `pfctl` (single binary) |
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Not in scope: `pfsync`/CARP failover, IPsec/pfkey, `ftp-proxy`, per-netns PF
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instances, classic-ALTQ-only schedulers (cbq/wfq/red — removed upstream before
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OpenBSD 8.0).
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## Screencasts
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Seven narrated screencasts per language (English and Portuguese), 1080p30 with
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burned-in subtitles, the lab's network diagram drawn over the terminal, and a
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continuous film that crossfades the phases together. Every video is a **real
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shell session** against the Alpine VMs — commands typed key by key, the kernel
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answering live — with a MiniMax female voice narrating:
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```sh
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./scripts/screencast/build-all.sh # -> out/screencast/{en,pt}/*.mp4
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```
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Details, per-phase breakdown and the YouTube description text:
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[`docs/en/screencast.md`](docs/en/screencast.md) ·
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[`docs/pt-BR/screencast.md`](docs/pt-BR/screencast.md)
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## Quick start
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Full recipe: [`docs/en/install.md`](docs/en/install.md). Short version
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(commands are read from the scripts):
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```sh
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./scripts/fetch-sources.sh # OpenBSD 8.0 sources (C3SL mirror, sha256-pinned)
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./scripts/vendorize.sh # stage the pristine files we port
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./scripts/build-kernel.sh # kernel 7.3.4: bzImage + modules_prepare (export patch: none needed)
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./scripts/build-module.sh # -> module/pf.ko
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make -C tools # -> tools/out/{pfctl,pdivert,pflogd,abitest}
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sudo insmod module/pf.ko # /dev/pf (0600) + netfilter hooks
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sudo pfctl -f /etc/pf.conf && sudo pfctl -e
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```
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Every feature listed above is exercised by the lab suite before you need it;
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[`docs/en/feature-matrix.md`](docs/en/feature-matrix.md) says which gate proves
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what, and [`docs/en/pf-guide.md`](docs/en/pf-guide.md) lists the deviations you
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should know before putting PF on a path that matters.
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VM validation lab (Alpine on libvirt): [`docs/en/vm-lab.md`](docs/en/vm-lab.md).
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Documentação em português: [`README.pt-BR.md`](README.pt-BR.md) e
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[`docs/pt-BR/`](docs/pt-BR/README.md).
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## Layout
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- `module/` — kernel sources: ported PF engine (`module/pfsrc`) + Linux compat layer (`module/compat`)
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- `tools/` — pfctl (static Linux build), pdivert relay, pflogd, ABI harness (`make -C tools abi`)
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- `patches/kernel/` — Linux core patch set (currently empty; evidence in `p1-needs.txt`, see `docs/en/patches.md`)
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- `scripts/` — fetch/build/patch/VM automation, plus `scripts/screencast/` for the videos
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- `tests/vm/` — VM suite: 15 gates (`tests/vm/NN-*.sh`) + `lib.sh`
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- `docs/en/` + `docs/pt-BR/` — full bilingual documentation
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- `docs/superpowers/` — design spec + implementation plan
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## License
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Ported OpenBSD code retains its original [ISC license and copyright notices](LICENSE).
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New Linux-side code: ISC.
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