[PATCH v2 bpf-next 02/13] bpf: Define migration types for SO_REUSEPORT.

[Kuniyuki Iwashima]

As noted in the preceding commit, there are two migration types. In
addition to that, the kernel will run the same eBPF program to select a
listener for SYN packets.

This patch defines three types to signal the kernel and the eBPF program if
it is receiving a new request or migrating ESTABLISHED/SYN_RECV sockets in
the accept queue or NEW_SYN_RECV socket during 3WHS.

Signed-off-by: Kuniyuki Iwashima <kun...@amazon.co.jp>
---
 include/uapi/linux/bpf.h       | 14 ++++++++++++++
 tools/include/uapi/linux/bpf.h | 14 ++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 1233f14f659f..7a48e0055500 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -4423,6 +4423,20 @@ struct sk_msg_md {
        __bpf_md_ptr(struct bpf_sock *, sk); /* current socket */
 };
 
+/* Migration type for SO_REUSEPORT enabled TCP sockets.
+ *
+ * BPF_SK_REUSEPORT_MIGRATE_NO      : Select a listener for SYN packets.
+ * BPF_SK_REUSEPORT_MIGRATE_QUEUE   : Migrate ESTABLISHED and SYN_RECV sockets 
in
+ *                                    the accept queue at close() or 
shutdown().
+ * BPF_SK_REUSEPORT_MIGRATE_REQUEST : Migrate NEW_SYN_RECV socket at receiving 
the
+ *                                    final ACK of 3WHS or retransmitting 
SYN+ACKs.
+ */
+enum {
+       BPF_SK_REUSEPORT_MIGRATE_NO,
+       BPF_SK_REUSEPORT_MIGRATE_QUEUE,
+       BPF_SK_REUSEPORT_MIGRATE_REQUEST,
+};
+
 struct sk_reuseport_md {
        /*
         * Start of directly accessible data. It begins from
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 1233f14f659f..7a48e0055500 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -4423,6 +4423,20 @@ struct sk_msg_md {
        __bpf_md_ptr(struct bpf_sock *, sk); /* current socket */
 };
 
+/* Migration type for SO_REUSEPORT enabled TCP sockets.
+ *
+ * BPF_SK_REUSEPORT_MIGRATE_NO      : Select a listener for SYN packets.
+ * BPF_SK_REUSEPORT_MIGRATE_QUEUE   : Migrate ESTABLISHED and SYN_RECV sockets 
in
+ *                                    the accept queue at close() or 
shutdown().
+ * BPF_SK_REUSEPORT_MIGRATE_REQUEST : Migrate NEW_SYN_RECV socket at receiving 
the
+ *                                    final ACK of 3WHS or retransmitting 
SYN+ACKs.
+ */
+enum {
+       BPF_SK_REUSEPORT_MIGRATE_NO,
+       BPF_SK_REUSEPORT_MIGRATE_QUEUE,
+       BPF_SK_REUSEPORT_MIGRATE_REQUEST,
+};
+
 struct sk_reuseport_md {
        /*
         * Start of directly accessible data. It begins from
-- 
2.17.2 (Apple Git-113)