netdev - [PATCH bpf-next 13/17] bpf: Sync linux/bpf.h to tools/

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Date:   Wed,  6 May 2020 14:55:09 +0200
From:   Jakub Sitnicki <jakub@...udflare.com>
To:     netdev@...r.kernel.org, bpf@...r.kernel.org
Cc:     dccp@...r.kernel.org, kernel-team@...udflare.com,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Gerrit Renker <gerrit@....abdn.ac.uk>,
        Jakub Kicinski <kuba@...nel.org>,
        Lorenz Bauer <lmb@...udflare.com>
Subject: [PATCH bpf-next 13/17] bpf: Sync linux/bpf.h to tools/

Newly added program, context type and helper is used by tests in a
subsequent patch. Synchronize the header file.

Reviewed-by: Lorenz Bauer <lmb@...udflare.com>
Signed-off-by: Jakub Sitnicki <jakub@...udflare.com>
---
 tools/include/uapi/linux/bpf.h | 53 ++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index b3643e27e264..e4c61b63d4bc 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -187,6 +187,7 @@ enum bpf_prog_type {
 	BPF_PROG_TYPE_STRUCT_OPS,
 	BPF_PROG_TYPE_EXT,
 	BPF_PROG_TYPE_LSM,
+	BPF_PROG_TYPE_SK_LOOKUP,
 };
 
 enum bpf_attach_type {
@@ -218,6 +219,7 @@ enum bpf_attach_type {
 	BPF_TRACE_FEXIT,
 	BPF_MODIFY_RETURN,
 	BPF_LSM_MAC,
+	BPF_SK_LOOKUP,
 	__MAX_BPF_ATTACH_TYPE
 };
 
@@ -3041,6 +3043,10 @@ union bpf_attr {
  *
  * int bpf_sk_assign(struct sk_buff *skb, struct bpf_sock *sk, u64 flags)
  *	Description
+ *		Helper is overloaded depending on BPF program type. This
+ *		description applies to **BPF_PROG_TYPE_SCHED_CLS** and
+ *		**BPF_PROG_TYPE_SCHED_ACT** programs.
+ *
  *		Assign the *sk* to the *skb*. When combined with appropriate
  *		routing configuration to receive the packet towards the socket,
  *		will cause *skb* to be delivered to the specified socket.
@@ -3061,6 +3067,39 @@ union bpf_attr {
  *					call from outside of TC ingress.
  *		* **-ESOCKTNOSUPPORT**	Socket type not supported (reuseport).
  *
+ * int bpf_sk_assign(struct bpf_sk_lookup *ctx, struct bpf_sock *sk, u64 flags)
+ *	Description
+ *		Helper is overloaded depending on BPF program type. This
+ *		description applies to **BPF_PROG_TYPE_SK_LOOKUP** programs.
+ *
+ *		Select the *sk* as a result of a socket lookup.
+ *
+ *		For the operation to succeed passed socket must be compatible
+ *		with the packet description provided by the *ctx* object.
+ *
+ *		L4 protocol (*IPPROTO_TCP* or *IPPROTO_UDP*) must be an exact
+ *		match. While IP family (*AF_INET* or *AF_INET6*) must be
+ *		compatible, that is IPv6 sockets that are not v6-only can be
+ *		selected for IPv4 packets.
+ *
+ *		Only full sockets can be selected. However, there is no need to
+ *		call bpf_fullsock() before passing a socket as an argument to
+ *		this helper.
+ *
+ *		The *flags* argument must be zero.
+ *	Return
+ *		0 on success, or a negative errno in case of failure.
+ *
+ *		**-EAFNOSUPPORT** is socket family (*sk->family*) is not
+ *		compatible with packet family (*ctx->family*).
+ *
+ *		**-EINVAL** if unsupported flags were specified.
+ *
+ *		**-EPROTOTYPE** if socket L4 protocol (*sk->protocol*) doesn't
+ *		match packet protocol (*ctx->protocol*).
+ *
+ *		**-ESOCKTNOSUPPORT** if socket is not a full socket.
+ *
  * u64 bpf_ktime_get_boot_ns(void)
  * 	Description
  * 		Return the time elapsed since system boot, in nanoseconds.
@@ -4012,4 +4051,18 @@ struct bpf_pidns_info {
 	__u32 pid;
 	__u32 tgid;
 };
+
+/* User accessible data for SK_LOOKUP programs. Add new fields at the end. */
+struct bpf_sk_lookup {
+	__u32 family;		/* AF_INET, AF_INET6 */
+	__u32 protocol;		/* IPPROTO_TCP, IPPROTO_UDP */
+	/* IP addresses allows 1, 2, and 4 bytes access */
+	__u32 src_ip4;
+	__u32 src_ip6[4];
+	__u32 src_port;		/* network byte order */
+	__u32 dst_ip4;
+	__u32 dst_ip6[4];
+	__u32 dst_port;		/* host byte order */
+};
+
 #endif /* _UAPI__LINUX_BPF_H__ */
-- 
2.25.3