[PATCH v7 0/7] pcapng: fixes and improvements

[Stephen Hemminger <stephen@networkplumber.org>]

This series addresses several issues in the pcapng library, improves
test coverage, and updates dumpcap error handling.

Patches 1-3 fix string handling in the pcapng administrative APIs.
The pcapng format uses 16-bit length fields for option data, but the
library did not validate input lengths and used fixed-size stack
buffers that could overflow with large strings.

Patch 4 optimizes timestamp conversion by replacing per-packet
divisions with precomputed reciprocal multiply-shift operations.

Patch 5 improves pcapng unit test coverage with varied comment
strings, randomized packet sizes, and 32-bit TSC wraparound
verification.

Patch 6 fixes the test build dependency so the pcapng test is
skipped when the null PMD is disabled.

Patch 7 improves error reporting in dumpcap for pcapng API failures.

v7:
  - Add meson build fix for disabled null PMD
  - Add dumpcap error reporting improvements
  - Update timestamp commit message to describe current implementation

Stephen Hemminger (7):
  pcapng: add length checks to string arguments
  pcapng: use malloc instead of fixed buffer size
  pcapng: chain additional mbuf when comment exceeds tailroom
  pcapng: improve performance of timestamping
  test/pcapng: add tests for comments
  test/pcapng: skip test if null driver missing
  dumpcap: improve pcapng error reporting

 app/dumpcap/main.c                     |  36 +++--
 app/test/meson.build                   |   2 +-
 app/test/test_pcapng.c                 | 151 ++++++++++++++-----
 doc/guides/rel_notes/release_26_03.rst |   9 ++
 lib/pcapng/rte_pcapng.c                | 199 +++++++++++++++++++------
 lib/pcapng/rte_pcapng.h                |  12 +-
 6 files changed, 307 insertions(+), 102 deletions(-)

-- 
2.51.0