netdev - [PATCH bpf v3 0/2] support SKF_NET_OFF and SKF_LL

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Message-ID: <20250408132833.195491-1-willemdebruijn.kernel@gmail.com>
Date: Tue,  8 Apr 2025 09:27:47 -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,
	sdf@...ichev.me,
	Willem de Bruijn <willemb@...gle.com>
Subject: [PATCH bpf v3 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.

v2->v3
  - do not remove bpf_internal_load_pointer_neg_helper, because it
    is still used in the sparc32 JIT

v1->v2
  - introduce bfp_skb_load_helper_convert_offset to avoid open
    coding
  - selftest: add comment why early demux must be disabled

v2: https://lore.kernel.org/netdev/20250404142633.1955847-1-willemdebruijn.kernel@gmail.com/
v1: https://lore.kernel.org/netdev/20250403140846.1268564-1-willemdebruijn.kernel@gmail.com/

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

 net/core/filter.c                          |  80 ++++---
 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 |  30 +++
 5 files changed, 321 insertions(+), 36 deletions(-)
 create mode 100644 tools/testing/selftests/net/skf_net_off.c
 create mode 100755 tools/testing/selftests/net/skf_net_off.sh

-- 
2.49.0.504.g3bcea36a83-goog