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bpf: Expose bpf_sk_storage_* to iterator programs

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Iterators are currently used to expose kernel information to userspace
over fast procfs-like files but iterators could also be used to
manipulate local storage. For example, the task_file iterator could be
used to initialize a socket local storage with associations between
processes and sockets or to selectively delete local storage values.

Signed-off-by: Florent Revest <revest@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: KP Singh <kpsingh@google.com>
Link: https://lore.kernel.org/bpf/20201204113609.1850150-3-revest@google.com
This commit is contained in:
Florent Revest 2020-12-04 12:36:06 +01:00 committed by Daniel Borkmann
parent 4f19cab761
commit a50a85e40c
1 changed files with 1 additions and 0 deletions
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net/core/bpf_sk_storage.c
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@ -394,6 +394,7 @@ static bool bpf_sk_storage_tracing_allowed(const struct bpf_prog *prog)
* use the bpf_sk_storage_(get|delete) helper.
*/
switch (prog->expected_attach_type) {
case BPF_TRACE_ITER:
case BPF_TRACE_RAW_TP:
/* bpf_sk_storage has no trace point */
return true;