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bpf, flow_dissector: Introduce BPF_FLOW_DISSECTOR_CONTINUE retcode for bpf progs

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Currently, attaching BPF_PROG_TYPE_FLOW_DISSECTOR programs completely
replaces the flow-dissector logic with custom dissection logic. This
forces implementors to write programs that handle dissection for any
flows expected in the namespace.

It makes sense for flow-dissector BPF programs to just augment the
dissector with custom logic (e.g. dissecting certain flows or custom
protocols), while enjoying the broad capabilities of the standard
dissector for any other traffic.

Introduce BPF_FLOW_DISSECTOR_CONTINUE retcode. Flow-dissector BPF
programs may return this to indicate no dissection was made, and
fallback to the standard dissector is requested.

Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20220821113519.116765-3-shmulik.ladkani@gmail.com
This commit is contained in:
Shmulik Ladkani
2022-08-21 14:35:17 +03:00
committed by Andrii Nakryiko
parent 12a41a80c5
commit 94d69cc07f
1 changed files with 5 additions and 0 deletions
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5
include/uapi/linux/bpf.h
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@@ -5861,6 +5861,11 @@ enum bpf_ret_code {
* represented by BPF_REDIRECT above).
*/
BPF_LWT_REROUTE = 128,
/* BPF_FLOW_DISSECTOR_CONTINUE: used by BPF_PROG_TYPE_FLOW_DISSECTOR
* to indicate that no custom dissection was performed, and
* fallback to standard dissector is requested.
*/
BPF_FLOW_DISSECTOR_CONTINUE = 129,
};
struct bpf_sock {