netdev - [PATCH bpf 0/2] support SKF_NET_OFF and SKF_LL

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Message-ID: <20250403140846.1268564-1-willemdebruijn.kernel@gmail.com>
Date: Thu,  3 Apr 2025 10:07:44 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: bpf@...r.kernel.org
Cc: netdev@...r.kernel.org,
	ast@...nel.org,
	daniel@...earbox.net,
	john.fastabend@...il.com,
	Willem de Bruijn <willemb@...gle.com>
Subject: [PATCH bpf 0/2] support SKF_NET_OFF and SKF_LL_OFF on skb frags

From: Willem de Bruijn <willemb@...gle.com>

Address a longstanding issue that may lead to missed packets
depending on system configuration.

Ensure that reading from packet contents works regardless of skb
geometry, also when using the special SKF_.. negative offsets to
offset from L2 or L3 header.

Patch 2 is the selftest for the fix.

Willem de Bruijn (2):
  bpf: support SKF_NET_OFF and SKF_LL_OFF on skb frags
  selftests/net: test sk_filter support for SKF_NET_OFF on frags

 include/linux/filter.h                     |   3 -
 kernel/bpf/core.c                          |  21 --
 net/core/filter.c                          |  75 ++++---
 tools/testing/selftests/net/.gitignore     |   1 +
 tools/testing/selftests/net/Makefile       |   2 +
 tools/testing/selftests/net/skf_net_off.c  | 244 +++++++++++++++++++++
 tools/testing/selftests/net/skf_net_off.sh |  28 +++
 7 files changed, 317 insertions(+), 57 deletions(-)
 create mode 100644 tools/testing/selftests/net/skf_net_off.c
 create mode 100755 tools/testing/selftests/net/skf_net_off.sh

-- 
2.49.0.472.ge94155a9ec-goog