linux-kernel - [PATCH bpf-next v4 2/4] bpf: Expose bpf_get_socket

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Message-Id: <20201209132636.1545761-2-revest@chromium.org>
Date:   Wed,  9 Dec 2020 14:26:34 +0100
From:   Florent Revest <revest@...omium.org>
To:     bpf@...r.kernel.org
Cc:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        kpsingh@...omium.org, kafai@...com, linux-kernel@...r.kernel.org,
        Florent Revest <revest@...omium.org>
Subject: [PATCH bpf-next v4 2/4] bpf: Expose bpf_get_socket_cookie to tracing programs

This needs two new helpers, one that works in a sleepable context (using
sock_gen_cookie which disables/enables preemption) and one that does not
(for performance reasons). Both take a struct sock pointer and need to
check it for NULLness.

This helper could also be useful to other BPF program types such as LSM.

Signed-off-by: Florent Revest <revest@...omium.org>
---
 include/linux/bpf.h            |  1 +
 include/uapi/linux/bpf.h       |  7 +++++++
 kernel/trace/bpf_trace.c       |  2 ++
 net/core/filter.c              | 12 ++++++++++++
 tools/include/uapi/linux/bpf.h |  7 +++++++
 5 files changed, 29 insertions(+)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 07cb5d15e743..5a858e8c3f1a 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -1860,6 +1860,7 @@ extern const struct bpf_func_proto bpf_per_cpu_ptr_proto;
 extern const struct bpf_func_proto bpf_this_cpu_ptr_proto;
 extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto;
 extern const struct bpf_func_proto bpf_sock_from_file_proto;
+extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto;
 
 const struct bpf_func_proto *bpf_tracing_func_proto(
 	enum bpf_func_id func_id, const struct bpf_prog *prog);
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index ba59309f4d18..9ac66cf25959 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -1667,6 +1667,13 @@ union bpf_attr {
  * 	Return
  * 		A 8-byte long unique number.
  *
+ * u64 bpf_get_socket_cookie(void *sk)
+ * 	Description
+ * 		Equivalent to **bpf_get_socket_cookie**\ () helper that accepts
+ * 		*sk*, but gets socket from a BTF **struct sock**.
+ * 	Return
+ * 		A 8-byte long unique number.
+ *
  * u32 bpf_get_socket_uid(struct sk_buff *skb)
  * 	Return
  * 		The owner UID of the socket associated to *skb*. If the socket
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 52ddd217d6a1..be5e96de306d 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -1760,6 +1760,8 @@ tracing_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 		return &bpf_sk_storage_delete_tracing_proto;
 	case BPF_FUNC_sock_from_file:
 		return &bpf_sock_from_file_proto;
+	case BPF_FUNC_get_socket_cookie:
+		return &bpf_get_socket_ptr_cookie_proto;
 #endif
 	case BPF_FUNC_seq_printf:
 		return prog->expected_attach_type == BPF_TRACE_ITER ?
diff --git a/net/core/filter.c b/net/core/filter.c
index 255aeee72402..13ad9a64f04f 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -4631,6 +4631,18 @@ static const struct bpf_func_proto bpf_get_socket_cookie_sock_proto = {
 	.arg1_type	= ARG_PTR_TO_CTX,
 };
 
+BPF_CALL_1(bpf_get_socket_ptr_cookie, struct sock *, sk)
+{
+	return sk ? sock_gen_cookie(sk) : 0;
+}
+
+const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto = {
+	.func		= bpf_get_socket_ptr_cookie,
+	.gpl_only	= false,
+	.ret_type	= RET_INTEGER,
+	.arg1_type	= ARG_PTR_TO_BTF_ID_SOCK_COMMON,
+};
+
 BPF_CALL_1(bpf_get_socket_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx)
 {
 	return __sock_gen_cookie(ctx->sk);
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index ba59309f4d18..9ac66cf25959 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -1667,6 +1667,13 @@ union bpf_attr {
  * 	Return
  * 		A 8-byte long unique number.
  *
+ * u64 bpf_get_socket_cookie(void *sk)
+ * 	Description
+ * 		Equivalent to **bpf_get_socket_cookie**\ () helper that accepts
+ * 		*sk*, but gets socket from a BTF **struct sock**.
+ * 	Return
+ * 		A 8-byte long unique number.
+ *
  * u32 bpf_get_socket_uid(struct sk_buff *skb)
  * 	Return
  * 		The owner UID of the socket associated to *skb*. If the socket
-- 
2.29.2.576.ga3fc446d84-goog