diff --git a/libc/kernel/uapi/linux/mptcp.h b/libc/kernel/uapi/linux/mptcp.h
index 43702f3..deaa1bf 100644
--- a/libc/kernel/uapi/linux/mptcp.h
+++ b/libc/kernel/uapi/linux/mptcp.h
@@ -81,4 +81,19 @@
   MPTCP_PM_CMD_GET_LIMITS,
   __MPTCP_PM_CMD_AFTER_LAST
 };
+#define MPTCP_INFO_FLAG_FALLBACK _BITUL(0)
+#define MPTCP_INFO_FLAG_REMOTE_KEY_RECEIVED _BITUL(1)
+struct mptcp_info {
+  __u8 mptcpi_subflows;
+  __u8 mptcpi_add_addr_signal;
+  __u8 mptcpi_add_addr_accepted;
+  __u8 mptcpi_subflows_max;
+  __u8 mptcpi_add_addr_signal_max;
+  __u8 mptcpi_add_addr_accepted_max;
+  __u32 mptcpi_flags;
+  __u32 mptcpi_token;
+  __u64 mptcpi_write_seq;
+  __u64 mptcpi_snd_una;
+  __u64 mptcpi_rcv_nxt;
+};
 #endif