linux-kernel - [PATCH bpf-next v4 3/6] bpf: Expose bpf_sk_storage

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Message-Id: <20201202205527.984965-3-revest@google.com>
Date:   Wed,  2 Dec 2020 21:55:24 +0100
From:   Florent Revest <revest@...omium.org>
To:     bpf@...r.kernel.org
Cc:     viro@...iv.linux.org.uk, davem@...emloft.net, kuba@...nel.org,
        ast@...nel.org, daniel@...earbox.net, kafai@...com, yhs@...com,
        andrii@...nel.org, kpsingh@...omium.org, revest@...gle.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        KP Singh <kpsingh@...gle.com>
Subject: [PATCH bpf-next v4 3/6] bpf: Expose bpf_sk_storage_* to iterator programs

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@...gle.com>
Acked-by: Martin KaFai Lau <kafai@...com>
Acked-by: KP Singh <kpsingh@...gle.com>
---
 net/core/bpf_sk_storage.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/core/bpf_sk_storage.c b/net/core/bpf_sk_storage.c
index a32037daa933..4edd033e899c 100644
--- a/net/core/bpf_sk_storage.c
+++ b/net/core/bpf_sk_storage.c
@@ -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;
-- 
2.29.2.454.gaff20da3a2-goog