Make the shared-listen-include pattern work with `reuseport` and the
other socket-level listen options. Nginx core enforces at-most-once
per sockaddr on options that set lsopt.set=1 (reuseport, bind,
backlog=, rcvbuf=, sndbuf=, setfib=, fastopen=, accept_filter=,
deferred, ipv6only=, so_keepalive=) and emits "duplicate listen
options for <addr>" otherwise. That rule collides with a single
listens.conf included from every vhost — each vhost's include
re-submits the same options.
The listen wrapper now detects the cross-cscf case, strips those
options from cf->args before delegating to the core handler, and
logs one notice per stripped listen. The first cscf owns the
options on the kernel socket; later cscfs merge cleanly via
ngx_http_add_server. Protocol-level flags (ssl, http2, quic,
proxy_protocol) pass through untouched since nginx OR-merges those
across cscfs.
This unblocks `reuseport` for deployments that want better
new-connection spread across workers.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
The previous wrapper skipped nginx's duplicate-listen check only
for listens that carried device=, so a `listen 80;` next to a
`listen 80 device=eth0 ...;` in the same server block was
rejected at config time. Under SO_BINDTODEVICE that restriction
tracked a real kernel constraint (device-tagged listens created
separate sockets, a bare listen alongside them was genuinely
ambiguous). Under the IP_PKTINFO model introduced in 450391a
the constraint no longer exists — all same-sockaddr listens
collapse to one wildcard kernel socket and attribution is a
per-connection cmsg readback — but the wrapper kept enforcing
the old rule by accident.
Extend the (cscf, sockaddr) dedup in the listen wrapper to
cover plain listens too: the first occurrence at a given
(server, sockaddr) pair calls nginx's handler and registers the
kernel socket, and every subsequent sibling — plain or
device-tagged — is accepted without tripping nginx's
duplicate-listen check. Device-tagged siblings additionally
push a binding into the attribution table as before; plain
siblings contribute only the seen-list entry. No code path
exercised by the existing 22 e2e tests changes behavior.
Update FR-1.5, the user-guide "shared port" section, the
module's top-of-function comments, and the test nginx.conf
comment to describe the relaxed rule. Bump VERSION and add a
debian/changelog entry for 0.7.1.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Self-heal device= → ifindex attribution and expose plugin meta
counters in the scrape.
ipng_stats_rescan_interval (default 60s, 0 to disable) runs a
per-worker timer that re-resolves every binding via if_nametoindex,
so interface teardown/recreate (e.g. GRE tunnel reprovision) picks
up the new ifindex without requiring an nginx reload.
nginx_ipng_ifindex_misses_total increments whenever a cmsg-reported
ingress ifindex doesn't match any binding — making stale mappings
observable. Also expose the existing zone_full_events and
flushes_total shared-memory counters, which were tracked but never
emitted. JSON output gains a top-level "meta" object; schema stays
at 2 (additive change).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Describe the ipng_stats_logtail UDP feature in debian/control alongside
the per-VIP / per-device counter description, so the package metadata
reflects what the module actually ships.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Introduces a VERSION variable in the top-level Makefile as the
authoritative source for the module's reported version. A new
version-header target writes src/version.h only when the content
would change, so no-op rebuilds don't rewrite the file. The C source
#includes that header in place of a hardcoded #define; the
user-guide's install example is wildcarded
(libnginx-mod-http-ipng-stats_*_amd64.deb) so it doesn't drift.
The design doc still references v0.2.0 by name — operators read it as
a point-in-time description, not a moving target.
debian/changelog keeps its own 0.2.0-1 entry because dpkg reads the
package version from there directly; the e2e test is updated to match
the JSON schema bump to 2.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Full implementation of the nginx dynamic module with:
- SO_BINDTODEVICE-based per-interface traffic attribution
- Per-worker lock-free counters flushed to shared memory
- Prometheus text and JSON scrape endpoint at configurable location
- UDP-only global logtail (ipng_stats_logtail) for fire-and-forget
access log streaming
- $ipng_source_tag nginx variable for use in log_format/map
- Histogram buckets, EWMA rate gauges, zone meta-metrics
- Debian packaging (libnginx-mod-http-ipng-stats)
- Robot Framework end-to-end tests via containerlab
- SPDX Apache-2.0 headers on all source files
