/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR MIT */
/*
 * Header file for the io_uring BPF filters.
 */
#ifndef LINUX_IO_URING_BPF_FILTER_H
#define LINUX_IO_URING_BPF_FILTER_H

#include <linux/types.h>

/*
 * Struct passed to filters.
 */
struct io_uring_bpf_ctx {
        __u64   user_data;
        __u8    opcode;
        __u8    sqe_flags;
        __u8    pdu_size;       /* size of aux data for filter */
        __u8    pad[5];
        union {
                struct {
                        __u32   family;
                        __u32   type;
                        __u32   protocol;
                } socket;
                struct {
                        __u64   flags;
                        __u64   mode;
                        __u64   resolve;
                } open;
        };
};

enum {
        /*
         * If set, any currently unset opcode will have a deny filter attached
         */
        IO_URING_BPF_FILTER_DENY_REST   = 1,
        /*
         * If set, if kernel and application don't agree on pdu_size for
         * the given opcode, fail the registration of the filter.
         */
        IO_URING_BPF_FILTER_SZ_STRICT   = 2,
};

struct io_uring_bpf_filter {
        __u32   opcode;         /* io_uring opcode to filter */
        __u32   flags;
        __u32   filter_len;     /* number of BPF instructions */
        __u8    pdu_size;       /* expected pdu size for opcode */
        __u8    resv[3];
        __u64   filter_ptr;     /* pointer to BPF filter */
        __u64   resv2[5];
};

enum {
        IO_URING_BPF_CMD_FILTER = 1,
};

struct io_uring_bpf {
        __u16   cmd_type;       /* IO_URING_BPF_* values */
        __u16   cmd_flags;      /* none so far */
        __u32   resv;
        union {
                struct io_uring_bpf_filter      filter;
        };
};

#endif