Adding upstream version 241.upstream/241upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

4 files changed, 1600 insertions, 0 deletions

diff --git a/src/shared/linux/auto_dev-ioctl.h b/src/shared/linux/auto_dev-ioctl.h
new file mode 100644
index 0000000..d9838eb
--- /dev/null
+++ b/src/shared/linux/auto_dev-ioctl.h
@@ -0,0 +1,229 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright © 2008 Red Hat, Inc. All rights reserved.
+ * Copyright © 2008 Ian Kent <raven@themaw.net>
+ *
+ * This file is part of the Linux kernel and is made available under
+ * the terms of the GNU General Public License, version 2, or at your
+ * option, any later version, incorporated herein by reference.
+ */
+
+#ifndef _LINUX_AUTO_DEV_IOCTL_H
+#define _LINUX_AUTO_DEV_IOCTL_H
+
+#include <linux/auto_fs.h>
+
+#ifdef __KERNEL__
+#include <linux/string.h>
+#else
+#include <string.h>
+#endif /* __KERNEL__ */
+
+#define AUTOFS_DEVICE_NAME		"autofs"
+
+#define AUTOFS_DEV_IOCTL_VERSION_MAJOR	1
+#define AUTOFS_DEV_IOCTL_VERSION_MINOR	0
+
+#define AUTOFS_DEVID_LEN		16
+
+#define AUTOFS_DEV_IOCTL_SIZE		sizeof(struct autofs_dev_ioctl)
+
+/*
+ * An ioctl interface for autofs mount point control.
+ */
+
+struct args_protover {
+	__u32	version;
+};
+
+struct args_protosubver {
+	__u32	sub_version;
+};
+
+struct args_openmount {
+	__u32	devid;
+};
+
+struct args_ready {
+	__u32	token;
+};
+
+struct args_fail {
+	__u32	token;
+	__s32	status;
+};
+
+struct args_setpipefd {
+	__s32	pipefd;
+};
+
+struct args_timeout {
+	__u64	timeout;
+};
+
+struct args_requester {
+	__u32	uid;
+	__u32	gid;
+};
+
+struct args_expire {
+	__u32	how;
+};
+
+struct args_askumount {
+	__u32	may_umount;
+};
+
+struct args_ismountpoint {
+	union {
+		struct args_in {
+			__u32	type;
+		} in;
+		struct args_out {
+			__u32	devid;
+			__u32	magic;
+		} out;
+	};
+};
+
+/*
+ * All the ioctls use this structure.
+ * When sending a path size must account for the total length
+ * of the chunk of memory otherwise is is the size of the
+ * structure.
+ */
+
+struct autofs_dev_ioctl {
+	__u32 ver_major;
+	__u32 ver_minor;
+	__u32 size;		/* total size of data passed in
+				 * including this struct */
+	__s32 ioctlfd;		/* automount command fd */
+
+	/* Command parameters */
+
+	union {
+		struct args_protover		protover;
+		struct args_protosubver		protosubver;
+		struct args_openmount		openmount;
+		struct args_ready		ready;
+		struct args_fail		fail;
+		struct args_setpipefd		setpipefd;
+		struct args_timeout		timeout;
+		struct args_requester		requester;
+		struct args_expire		expire;
+		struct args_askumount		askumount;
+		struct args_ismountpoint	ismountpoint;
+	};
+
+	char path[0];
+};
+
+static inline void init_autofs_dev_ioctl(struct autofs_dev_ioctl *in) {
+	memset(in, 0, sizeof(struct autofs_dev_ioctl));
+	in->ver_major = AUTOFS_DEV_IOCTL_VERSION_MAJOR;
+	in->ver_minor = AUTOFS_DEV_IOCTL_VERSION_MINOR;
+	in->size = sizeof(struct autofs_dev_ioctl);
+	in->ioctlfd = -1;
+	return;
+}
+
+/*
+ * If you change this make sure you make the corresponding change
+ * to autofs-dev-ioctl.c:lookup_ioctl()
+ */
+enum {
+	/* Get various version info */
+	AUTOFS_DEV_IOCTL_VERSION_CMD = 0x71,
+	AUTOFS_DEV_IOCTL_PROTOVER_CMD,
+	AUTOFS_DEV_IOCTL_PROTOSUBVER_CMD,
+
+	/* Open mount ioctl fd */
+	AUTOFS_DEV_IOCTL_OPENMOUNT_CMD,
+
+	/* Close mount ioctl fd */
+	AUTOFS_DEV_IOCTL_CLOSEMOUNT_CMD,
+
+	/* Mount/expire status returns */
+	AUTOFS_DEV_IOCTL_READY_CMD,
+	AUTOFS_DEV_IOCTL_FAIL_CMD,
+
+	/* Activate/deactivate autofs mount */
+	AUTOFS_DEV_IOCTL_SETPIPEFD_CMD,
+	AUTOFS_DEV_IOCTL_CATATONIC_CMD,
+
+	/* Expiry timeout */
+	AUTOFS_DEV_IOCTL_TIMEOUT_CMD,
+
+	/* Get mount last requesting uid and gid */
+	AUTOFS_DEV_IOCTL_REQUESTER_CMD,
+
+	/* Check for eligible expire candidates */
+	AUTOFS_DEV_IOCTL_EXPIRE_CMD,
+
+	/* Request busy status */
+	AUTOFS_DEV_IOCTL_ASKUMOUNT_CMD,
+
+	/* Check if path is a mountpoint */
+	AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD,
+};
+
+#define AUTOFS_IOCTL 0x93
+
+#define AUTOFS_DEV_IOCTL_VERSION \
+	_IOWR(AUTOFS_IOCTL, \
+	      AUTOFS_DEV_IOCTL_VERSION_CMD, struct autofs_dev_ioctl)
+
+#define AUTOFS_DEV_IOCTL_PROTOVER \
+	_IOWR(AUTOFS_IOCTL, \
+	      AUTOFS_DEV_IOCTL_PROTOVER_CMD, struct autofs_dev_ioctl)
+
+#define AUTOFS_DEV_IOCTL_PROTOSUBVER \
+	_IOWR(AUTOFS_IOCTL, \
+	      AUTOFS_DEV_IOCTL_PROTOSUBVER_CMD, struct autofs_dev_ioctl)
+
+#define AUTOFS_DEV_IOCTL_OPENMOUNT \
+	_IOWR(AUTOFS_IOCTL, \
+	      AUTOFS_DEV_IOCTL_OPENMOUNT_CMD, struct autofs_dev_ioctl)
+
+#define AUTOFS_DEV_IOCTL_CLOSEMOUNT \
+	_IOWR(AUTOFS_IOCTL, \
+	      AUTOFS_DEV_IOCTL_CLOSEMOUNT_CMD, struct autofs_dev_ioctl)
+
+#define AUTOFS_DEV_IOCTL_READY \
+	_IOWR(AUTOFS_IOCTL, \
+	      AUTOFS_DEV_IOCTL_READY_CMD, struct autofs_dev_ioctl)
+
+#define AUTOFS_DEV_IOCTL_FAIL \
+	_IOWR(AUTOFS_IOCTL, \
+	      AUTOFS_DEV_IOCTL_FAIL_CMD, struct autofs_dev_ioctl)
+
+#define AUTOFS_DEV_IOCTL_SETPIPEFD \
+	_IOWR(AUTOFS_IOCTL, \
+	      AUTOFS_DEV_IOCTL_SETPIPEFD_CMD, struct autofs_dev_ioctl)
+
+#define AUTOFS_DEV_IOCTL_CATATONIC \
+	_IOWR(AUTOFS_IOCTL, \
+	      AUTOFS_DEV_IOCTL_CATATONIC_CMD, struct autofs_dev_ioctl)
+
+#define AUTOFS_DEV_IOCTL_TIMEOUT \
+	_IOWR(AUTOFS_IOCTL, \
+	      AUTOFS_DEV_IOCTL_TIMEOUT_CMD, struct autofs_dev_ioctl)
+
+#define AUTOFS_DEV_IOCTL_REQUESTER \
+	_IOWR(AUTOFS_IOCTL, \
+	      AUTOFS_DEV_IOCTL_REQUESTER_CMD, struct autofs_dev_ioctl)
+
+#define AUTOFS_DEV_IOCTL_EXPIRE \
+	_IOWR(AUTOFS_IOCTL, \
+	      AUTOFS_DEV_IOCTL_EXPIRE_CMD, struct autofs_dev_ioctl)
+
+#define AUTOFS_DEV_IOCTL_ASKUMOUNT \
+	_IOWR(AUTOFS_IOCTL, \
+	      AUTOFS_DEV_IOCTL_ASKUMOUNT_CMD, struct autofs_dev_ioctl)
+
+#define AUTOFS_DEV_IOCTL_ISMOUNTPOINT \
+	_IOWR(AUTOFS_IOCTL, \
+	      AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD, struct autofs_dev_ioctl)
+
+#endif	/* _LINUX_AUTO_DEV_IOCTL_H */
diff --git a/src/shared/linux/bpf.h b/src/shared/linux/bpf.h
new file mode 100644
index 0000000..1df9e7e
--- /dev/null
+++ b/src/shared/linux/bpf.h
@@ -0,0 +1,1109 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ */
+#ifndef _UAPI__LINUX_BPF_H__
+#define _UAPI__LINUX_BPF_H__
+
+#include <linux/types.h>
+#include <linux/bpf_common.h>
+
+/* Extended instruction set based on top of classic BPF */
+
+/* instruction classes */
+#define BPF_ALU64	0x07	/* alu mode in double word width */
+
+/* ld/ldx fields */
+#define BPF_DW		0x18	/* double word (64-bit) */
+#define BPF_XADD	0xc0	/* exclusive add */
+
+/* alu/jmp fields */
+#define BPF_MOV		0xb0	/* mov reg to reg */
+#define BPF_ARSH	0xc0	/* sign extending arithmetic shift right */
+
+/* change endianness of a register */
+#define BPF_END		0xd0	/* flags for endianness conversion: */
+#define BPF_TO_LE	0x00	/* convert to little-endian */
+#define BPF_TO_BE	0x08	/* convert to big-endian */
+#define BPF_FROM_LE	BPF_TO_LE
+#define BPF_FROM_BE	BPF_TO_BE
+
+/* jmp encodings */
+#define BPF_JNE		0x50	/* jump != */
+#define BPF_JLT		0xa0	/* LT is unsigned, '<' */
+#define BPF_JLE		0xb0	/* LE is unsigned, '<=' */
+#define BPF_JSGT	0x60	/* SGT is signed '>', GT in x86 */
+#define BPF_JSGE	0x70	/* SGE is signed '>=', GE in x86 */
+#define BPF_JSLT	0xc0	/* SLT is signed, '<' */
+#define BPF_JSLE	0xd0	/* SLE is signed, '<=' */
+#define BPF_CALL	0x80	/* function call */
+#define BPF_EXIT	0x90	/* function return */
+
+/* Register numbers */
+enum {
+        BPF_REG_0 = 0,
+        BPF_REG_1,
+        BPF_REG_2,
+        BPF_REG_3,
+        BPF_REG_4,
+        BPF_REG_5,
+        BPF_REG_6,
+        BPF_REG_7,
+        BPF_REG_8,
+        BPF_REG_9,
+        BPF_REG_10,
+        __MAX_BPF_REG,
+};
+
+/* BPF has 10 general purpose 64-bit registers and stack frame. */
+#define MAX_BPF_REG	__MAX_BPF_REG
+
+struct bpf_insn {
+        __u8	code;		/* opcode */
+        __u8	dst_reg:4;	/* dest register */
+        __u8	src_reg:4;	/* source register */
+        __s16	off;		/* signed offset */
+        __s32	imm;		/* signed immediate constant */
+};
+
+/* Key of an a BPF_MAP_TYPE_LPM_TRIE entry */
+struct bpf_lpm_trie_key {
+        __u32	prefixlen;	/* up to 32 for AF_INET, 128 for AF_INET6 */
+        __u8	data[0];	/* Arbitrary size */
+};
+
+/* BPF syscall commands, see bpf(2) man-page for details. */
+enum bpf_cmd {
+        BPF_MAP_CREATE,
+        BPF_MAP_LOOKUP_ELEM,
+        BPF_MAP_UPDATE_ELEM,
+        BPF_MAP_DELETE_ELEM,
+        BPF_MAP_GET_NEXT_KEY,
+        BPF_PROG_LOAD,
+        BPF_OBJ_PIN,
+        BPF_OBJ_GET,
+        BPF_PROG_ATTACH,
+        BPF_PROG_DETACH,
+        BPF_PROG_TEST_RUN,
+        BPF_PROG_GET_NEXT_ID,
+        BPF_MAP_GET_NEXT_ID,
+        BPF_PROG_GET_FD_BY_ID,
+        BPF_MAP_GET_FD_BY_ID,
+        BPF_OBJ_GET_INFO_BY_FD,
+        BPF_PROG_QUERY,
+};
+
+enum bpf_map_type {
+        BPF_MAP_TYPE_UNSPEC,
+        BPF_MAP_TYPE_HASH,
+        BPF_MAP_TYPE_ARRAY,
+        BPF_MAP_TYPE_PROG_ARRAY,
+        BPF_MAP_TYPE_PERF_EVENT_ARRAY,
+        BPF_MAP_TYPE_PERCPU_HASH,
+        BPF_MAP_TYPE_PERCPU_ARRAY,
+        BPF_MAP_TYPE_STACK_TRACE,
+        BPF_MAP_TYPE_CGROUP_ARRAY,
+        BPF_MAP_TYPE_LRU_HASH,
+        BPF_MAP_TYPE_LRU_PERCPU_HASH,
+        BPF_MAP_TYPE_LPM_TRIE,
+        BPF_MAP_TYPE_ARRAY_OF_MAPS,
+        BPF_MAP_TYPE_HASH_OF_MAPS,
+        BPF_MAP_TYPE_DEVMAP,
+        BPF_MAP_TYPE_SOCKMAP,
+        BPF_MAP_TYPE_CPUMAP,
+};
+
+enum bpf_prog_type {
+        BPF_PROG_TYPE_UNSPEC,
+        BPF_PROG_TYPE_SOCKET_FILTER,
+        BPF_PROG_TYPE_KPROBE,
+        BPF_PROG_TYPE_SCHED_CLS,
+        BPF_PROG_TYPE_SCHED_ACT,
+        BPF_PROG_TYPE_TRACEPOINT,
+        BPF_PROG_TYPE_XDP,
+        BPF_PROG_TYPE_PERF_EVENT,
+        BPF_PROG_TYPE_CGROUP_SKB,
+        BPF_PROG_TYPE_CGROUP_SOCK,
+        BPF_PROG_TYPE_LWT_IN,
+        BPF_PROG_TYPE_LWT_OUT,
+        BPF_PROG_TYPE_LWT_XMIT,
+        BPF_PROG_TYPE_SOCK_OPS,
+        BPF_PROG_TYPE_SK_SKB,
+        BPF_PROG_TYPE_CGROUP_DEVICE,
+};
+
+enum bpf_attach_type {
+        BPF_CGROUP_INET_INGRESS,
+        BPF_CGROUP_INET_EGRESS,
+        BPF_CGROUP_INET_SOCK_CREATE,
+        BPF_CGROUP_SOCK_OPS,
+        BPF_SK_SKB_STREAM_PARSER,
+        BPF_SK_SKB_STREAM_VERDICT,
+        BPF_CGROUP_DEVICE,
+        __MAX_BPF_ATTACH_TYPE
+};
+
+#define MAX_BPF_ATTACH_TYPE __MAX_BPF_ATTACH_TYPE
+
+/* cgroup-bpf attach flags used in BPF_PROG_ATTACH command
+ *
+ * NONE(default): No further bpf programs allowed in the subtree.
+ *
+ * BPF_F_ALLOW_OVERRIDE: If a sub-cgroup installs some bpf program,
+ * the program in this cgroup yields to sub-cgroup program.
+ *
+ * BPF_F_ALLOW_MULTI: If a sub-cgroup installs some bpf program,
+ * that cgroup program gets run in addition to the program in this cgroup.
+ *
+ * Only one program is allowed to be attached to a cgroup with
+ * NONE or BPF_F_ALLOW_OVERRIDE flag.
+ * Attaching another program on top of NONE or BPF_F_ALLOW_OVERRIDE will
+ * release old program and attach the new one. Attach flags has to match.
+ *
+ * Multiple programs are allowed to be attached to a cgroup with
+ * BPF_F_ALLOW_MULTI flag. They are executed in FIFO order
+ * (those that were attached first, run first)
+ * The programs of sub-cgroup are executed first, then programs of
+ * this cgroup and then programs of parent cgroup.
+ * When children program makes decision (like picking TCP CA or sock bind)
+ * parent program has a chance to override it.
+ *
+ * A cgroup with MULTI or OVERRIDE flag allows any attach flags in sub-cgroups.
+ * A cgroup with NONE doesn't allow any programs in sub-cgroups.
+ * Ex1:
+ * cgrp1 (MULTI progs A, B) ->
+ *    cgrp2 (OVERRIDE prog C) ->
+ *      cgrp3 (MULTI prog D) ->
+ *        cgrp4 (OVERRIDE prog E) ->
+ *          cgrp5 (NONE prog F)
+ * the event in cgrp5 triggers execution of F,D,A,B in that order.
+ * if prog F is detached, the execution is E,D,A,B
+ * if prog F and D are detached, the execution is E,A,B
+ * if prog F, E and D are detached, the execution is C,A,B
+ *
+ * All eligible programs are executed regardless of return code from
+ * earlier programs.
+ */
+#define BPF_F_ALLOW_OVERRIDE	(1U << 0)
+#define BPF_F_ALLOW_MULTI	(1U << 1)
+
+/* If BPF_F_STRICT_ALIGNMENT is used in BPF_PROG_LOAD command, the
+ * verifier will perform strict alignment checking as if the kernel
+ * has been built with CONFIG_EFFICIENT_UNALIGNED_ACCESS not set,
+ * and NET_IP_ALIGN defined to 2.
+ */
+#define BPF_F_STRICT_ALIGNMENT	(1U << 0)
+
+/* when bpf_ldimm64->src_reg == BPF_PSEUDO_MAP_FD, bpf_ldimm64->imm == fd */
+#define BPF_PSEUDO_MAP_FD	1
+
+/* when bpf_call->src_reg == BPF_PSEUDO_CALL, bpf_call->imm == pc-relative
+ * offset to another bpf function
+ */
+#define BPF_PSEUDO_CALL		1
+
+/* flags for BPF_MAP_UPDATE_ELEM command */
+#define BPF_ANY		0 /* create new element or update existing */
+#define BPF_NOEXIST	1 /* create new element if it didn't exist */
+#define BPF_EXIST	2 /* update existing element */
+
+/* flags for BPF_MAP_CREATE command */
+#define BPF_F_NO_PREALLOC	(1U << 0)
+/* Instead of having one common LRU list in the
+ * BPF_MAP_TYPE_LRU_[PERCPU_]HASH map, use a percpu LRU list
+ * which can scale and perform better.
+ * Note, the LRU nodes (including free nodes) cannot be moved
+ * across different LRU lists.
+ */
+#define BPF_F_NO_COMMON_LRU	(1U << 1)
+/* Specify numa node during map creation */
+#define BPF_F_NUMA_NODE		(1U << 2)
+
+/* flags for BPF_PROG_QUERY */
+#define BPF_F_QUERY_EFFECTIVE	(1U << 0)
+
+#define BPF_OBJ_NAME_LEN 16U
+
+/* Flags for accessing BPF object */
+#define BPF_F_RDONLY		(1U << 3)
+#define BPF_F_WRONLY		(1U << 4)
+
+union bpf_attr {
+        struct { /* anonymous struct used by BPF_MAP_CREATE command */
+                __u32	map_type;	/* one of enum bpf_map_type */
+                __u32	key_size;	/* size of key in bytes */
+                __u32	value_size;	/* size of value in bytes */
+                __u32	max_entries;	/* max number of entries in a map */
+                __u32	map_flags;	/* BPF_MAP_CREATE related
+                                         * flags defined above.
+                                         */
+                __u32	inner_map_fd;	/* fd pointing to the inner map */
+                __u32	numa_node;	/* numa node (effective only if
+                                         * BPF_F_NUMA_NODE is set).
+                                         */
+                char	map_name[BPF_OBJ_NAME_LEN];
+                __u32	map_ifindex;	/* ifindex of netdev to create on */
+        };
+
+        struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */
+                __u32		map_fd;
+                __aligned_u64	key;
+                union {
+                        __aligned_u64 value;
+                        __aligned_u64 next_key;
+                };
+                __u64		flags;
+        };
+
+        struct { /* anonymous struct used by BPF_PROG_LOAD command */
+                __u32		prog_type;	/* one of enum bpf_prog_type */
+                __u32		insn_cnt;
+                __aligned_u64	insns;
+                __aligned_u64	license;
+                __u32		log_level;	/* verbosity level of verifier */
+                __u32		log_size;	/* size of user buffer */
+                __aligned_u64	log_buf;	/* user supplied buffer */
+                __u32		kern_version;	/* checked when prog_type=kprobe */
+                __u32		prog_flags;
+                char		prog_name[BPF_OBJ_NAME_LEN];
+                __u32		prog_ifindex;	/* ifindex of netdev to prep for */
+        };
+
+        struct { /* anonymous struct used by BPF_OBJ_* commands */
+                __aligned_u64	pathname;
+                __u32		bpf_fd;
+                __u32		file_flags;
+        };
+
+        struct { /* anonymous struct used by BPF_PROG_ATTACH/DETACH commands */
+                __u32		target_fd;	/* container object to attach to */
+                __u32		attach_bpf_fd;	/* eBPF program to attach */
+                __u32		attach_type;
+                __u32		attach_flags;
+        };
+
+        struct { /* anonymous struct used by BPF_PROG_TEST_RUN command */
+                __u32		prog_fd;
+                __u32		retval;
+                __u32		data_size_in;
+                __u32		data_size_out;
+                __aligned_u64	data_in;
+                __aligned_u64	data_out;
+                __u32		repeat;
+                __u32		duration;
+        } test;
+
+        struct { /* anonymous struct used by BPF_*_GET_*_ID */
+                union {
+                        __u32		start_id;
+                        __u32		prog_id;
+                        __u32		map_id;
+                };
+                __u32		next_id;
+                __u32		open_flags;
+        };
+
+        struct { /* anonymous struct used by BPF_OBJ_GET_INFO_BY_FD */
+                __u32		bpf_fd;
+                __u32		info_len;
+                __aligned_u64	info;
+        } info;
+
+        struct { /* anonymous struct used by BPF_PROG_QUERY command */
+                __u32		target_fd;	/* container object to query */
+                __u32		attach_type;
+                __u32		query_flags;
+                __u32		attach_flags;
+                __aligned_u64	prog_ids;
+                __u32		prog_cnt;
+        } query;
+} __attribute__((aligned(8)));
+
+/* BPF helper function descriptions:
+ *
+ * void *bpf_map_lookup_elem(&map, &key)
+ *     Return: Map value or NULL
+ *
+ * int bpf_map_update_elem(&map, &key, &value, flags)
+ *     Return: 0 on success or negative error
+ *
+ * int bpf_map_delete_elem(&map, &key)
+ *     Return: 0 on success or negative error
+ *
+ * int bpf_probe_read(void *dst, int size, void *src)
+ *     Return: 0 on success or negative error
+ *
+ * u64 bpf_ktime_get_ns(void)
+ *     Return: current ktime
+ *
+ * int bpf_trace_printk(const char *fmt, int fmt_size, ...)
+ *     Return: length of buffer written or negative error
+ *
+ * u32 bpf_prandom_u32(void)
+ *     Return: random value
+ *
+ * u32 bpf_raw_smp_processor_id(void)
+ *     Return: SMP processor ID
+ *
+ * int bpf_skb_store_bytes(skb, offset, from, len, flags)
+ *     store bytes into packet
+ *     @skb: pointer to skb
+ *     @offset: offset within packet from skb->mac_header
+ *     @from: pointer where to copy bytes from
+ *     @len: number of bytes to store into packet
+ *     @flags: bit 0 - if true, recompute skb->csum
+ *             other bits - reserved
+ *     Return: 0 on success or negative error
+ *
+ * int bpf_l3_csum_replace(skb, offset, from, to, flags)
+ *     recompute IP checksum
+ *     @skb: pointer to skb
+ *     @offset: offset within packet where IP checksum is located
+ *     @from: old value of header field
+ *     @to: new value of header field
+ *     @flags: bits 0-3 - size of header field
+ *             other bits - reserved
+ *     Return: 0 on success or negative error
+ *
+ * int bpf_l4_csum_replace(skb, offset, from, to, flags)
+ *     recompute TCP/UDP checksum
+ *     @skb: pointer to skb
+ *     @offset: offset within packet where TCP/UDP checksum is located
+ *     @from: old value of header field
+ *     @to: new value of header field
+ *     @flags: bits 0-3 - size of header field
+ *             bit 4 - is pseudo header
+ *             other bits - reserved
+ *     Return: 0 on success or negative error
+ *
+ * int bpf_tail_call(ctx, prog_array_map, index)
+ *     jump into another BPF program
+ *     @ctx: context pointer passed to next program
+ *     @prog_array_map: pointer to map which type is BPF_MAP_TYPE_PROG_ARRAY
+ *     @index: 32-bit index inside array that selects specific program to run
+ *     Return: 0 on success or negative error
+ *
+ * int bpf_clone_redirect(skb, ifindex, flags)
+ *     redirect to another netdev
+ *     @skb: pointer to skb
+ *     @ifindex: ifindex of the net device
+ *     @flags: bit 0 - if set, redirect to ingress instead of egress
+ *             other bits - reserved
+ *     Return: 0 on success or negative error
+ *
+ * u64 bpf_get_current_pid_tgid(void)
+ *     Return: current->tgid << 32 | current->pid
+ *
+ * u64 bpf_get_current_uid_gid(void)
+ *     Return: current_gid << 32 | current_uid
+ *
+ * int bpf_get_current_comm(char *buf, int size_of_buf)
+ *     stores current->comm into buf
+ *     Return: 0 on success or negative error
+ *
+ * u32 bpf_get_cgroup_classid(skb)
+ *     retrieve a proc's classid
+ *     @skb: pointer to skb
+ *     Return: classid if != 0
+ *
+ * int bpf_skb_vlan_push(skb, vlan_proto, vlan_tci)
+ *     Return: 0 on success or negative error
+ *
+ * int bpf_skb_vlan_pop(skb)
+ *     Return: 0 on success or negative error
+ *
+ * int bpf_skb_get_tunnel_key(skb, key, size, flags)
+ * int bpf_skb_set_tunnel_key(skb, key, size, flags)
+ *     retrieve or populate tunnel metadata
+ *     @skb: pointer to skb
+ *     @key: pointer to 'struct bpf_tunnel_key'
+ *     @size: size of 'struct bpf_tunnel_key'
+ *     @flags: room for future extensions
+ *     Return: 0 on success or negative error
+ *
+ * u64 bpf_perf_event_read(map, flags)
+ *     read perf event counter value
+ *     @map: pointer to perf_event_array map
+ *     @flags: index of event in the map or bitmask flags
+ *     Return: value of perf event counter read or error code
+ *
+ * int bpf_redirect(ifindex, flags)
+ *     redirect to another netdev
+ *     @ifindex: ifindex of the net device
+ *     @flags:
+ *	  cls_bpf:
+ *          bit 0 - if set, redirect to ingress instead of egress
+ *          other bits - reserved
+ *	  xdp_bpf:
+ *	    all bits - reserved
+ *     Return: cls_bpf: TC_ACT_REDIRECT on success or TC_ACT_SHOT on error
+ *	       xdp_bfp: XDP_REDIRECT on success or XDP_ABORT on error
+ * int bpf_redirect_map(map, key, flags)
+ *     redirect to endpoint in map
+ *     @map: pointer to dev map
+ *     @key: index in map to lookup
+ *     @flags: --
+ *     Return: XDP_REDIRECT on success or XDP_ABORT on error
+ *
+ * u32 bpf_get_route_realm(skb)
+ *     retrieve a dst's tclassid
+ *     @skb: pointer to skb
+ *     Return: realm if != 0
+ *
+ * int bpf_perf_event_output(ctx, map, flags, data, size)
+ *     output perf raw sample
+ *     @ctx: struct pt_regs*
+ *     @map: pointer to perf_event_array map
+ *     @flags: index of event in the map or bitmask flags
+ *     @data: data on stack to be output as raw data
+ *     @size: size of data
+ *     Return: 0 on success or negative error
+ *
+ * int bpf_get_stackid(ctx, map, flags)
+ *     walk user or kernel stack and return id
+ *     @ctx: struct pt_regs*
+ *     @map: pointer to stack_trace map
+ *     @flags: bits 0-7 - numer of stack frames to skip
+ *             bit 8 - collect user stack instead of kernel
+ *             bit 9 - compare stacks by hash only
+ *             bit 10 - if two different stacks hash into the same stackid
+ *                      discard old
+ *             other bits - reserved
+ *     Return: >= 0 stackid on success or negative error
+ *
+ * s64 bpf_csum_diff(from, from_size, to, to_size, seed)
+ *     calculate csum diff
+ *     @from: raw from buffer
+ *     @from_size: length of from buffer
+ *     @to: raw to buffer
+ *     @to_size: length of to buffer
+ *     @seed: optional seed
+ *     Return: csum result or negative error code
+ *
+ * int bpf_skb_get_tunnel_opt(skb, opt, size)
+ *     retrieve tunnel options metadata
+ *     @skb: pointer to skb
+ *     @opt: pointer to raw tunnel option data
+ *     @size: size of @opt
+ *     Return: option size
+ *
+ * int bpf_skb_set_tunnel_opt(skb, opt, size)
+ *     populate tunnel options metadata
+ *     @skb: pointer to skb
+ *     @opt: pointer to raw tunnel option data
+ *     @size: size of @opt
+ *     Return: 0 on success or negative error
+ *
+ * int bpf_skb_change_proto(skb, proto, flags)
+ *     Change protocol of the skb. Currently supported is v4 -> v6,
+ *     v6 -> v4 transitions. The helper will also resize the skb. eBPF
+ *     program is expected to fill the new headers via skb_store_bytes
+ *     and lX_csum_replace.
+ *     @skb: pointer to skb
+ *     @proto: new skb->protocol type
+ *     @flags: reserved
+ *     Return: 0 on success or negative error
+ *
+ * int bpf_skb_change_type(skb, type)
+ *     Change packet type of skb.
+ *     @skb: pointer to skb
+ *     @type: new skb->pkt_type type
+ *     Return: 0 on success or negative error
+ *
+ * int bpf_skb_under_cgroup(skb, map, index)
+ *     Check cgroup2 membership of skb
+ *     @skb: pointer to skb
+ *     @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type
+ *     @index: index of the cgroup in the bpf_map
+ *     Return:
+ *       == 0 skb failed the cgroup2 descendant test
+ *       == 1 skb succeeded the cgroup2 descendant test
+ *        < 0 error
+ *
+ * u32 bpf_get_hash_recalc(skb)
+ *     Retrieve and possibly recalculate skb->hash.
+ *     @skb: pointer to skb
+ *     Return: hash
+ *
+ * u64 bpf_get_current_task(void)
+ *     Returns current task_struct
+ *     Return: current
+ *
+ * int bpf_probe_write_user(void *dst, void *src, int len)
+ *     safely attempt to write to a location
+ *     @dst: destination address in userspace
+ *     @src: source address on stack
+ *     @len: number of bytes to copy
+ *     Return: 0 on success or negative error
+ *
+ * int bpf_current_task_under_cgroup(map, index)
+ *     Check cgroup2 membership of current task
+ *     @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type
+ *     @index: index of the cgroup in the bpf_map
+ *     Return:
+ *       == 0 current failed the cgroup2 descendant test
+ *       == 1 current succeeded the cgroup2 descendant test
+ *        < 0 error
+ *
+ * int bpf_skb_change_tail(skb, len, flags)
+ *     The helper will resize the skb to the given new size, to be used f.e.
+ *     with control messages.
+ *     @skb: pointer to skb
+ *     @len: new skb length
+ *     @flags: reserved
+ *     Return: 0 on success or negative error
+ *
+ * int bpf_skb_pull_data(skb, len)
+ *     The helper will pull in non-linear data in case the skb is non-linear
+ *     and not all of len are part of the linear section. Only needed for
+ *     read/write with direct packet access.
+ *     @skb: pointer to skb
+ *     @len: len to make read/writeable
+ *     Return: 0 on success or negative error
+ *
+ * s64 bpf_csum_update(skb, csum)
+ *     Adds csum into skb->csum in case of CHECKSUM_COMPLETE.
+ *     @skb: pointer to skb
+ *     @csum: csum to add
+ *     Return: csum on success or negative error
+ *
+ * void bpf_set_hash_invalid(skb)
+ *     Invalidate current skb->hash.
+ *     @skb: pointer to skb
+ *
+ * int bpf_get_numa_node_id()
+ *     Return: Id of current NUMA node.
+ *
+ * int bpf_skb_change_head()
+ *     Grows headroom of skb and adjusts MAC header offset accordingly.
+ *     Will extends/reallocae as required automatically.
+ *     May change skb data pointer and will thus invalidate any check
+ *     performed for direct packet access.
+ *     @skb: pointer to skb
+ *     @len: length of header to be pushed in front
+ *     @flags: Flags (unused for now)
+ *     Return: 0 on success or negative error
+ *
+ * int bpf_xdp_adjust_head(xdp_md, delta)
+ *     Adjust the xdp_md.data by delta
+ *     @xdp_md: pointer to xdp_md
+ *     @delta: An positive/negative integer to be added to xdp_md.data
+ *     Return: 0 on success or negative on error
+ *
+ * int bpf_probe_read_str(void *dst, int size, const void *unsafe_ptr)
+ *     Copy a NUL terminated string from unsafe address. In case the string
+ *     length is smaller than size, the target is not padded with further NUL
+ *     bytes. In case the string length is larger than size, just count-1
+ *     bytes are copied and the last byte is set to NUL.
+ *     @dst: destination address
+ *     @size: maximum number of bytes to copy, including the trailing NUL
+ *     @unsafe_ptr: unsafe address
+ *     Return:
+ *       > 0 length of the string including the trailing NUL on success
+ *       < 0 error
+ *
+ * u64 bpf_get_socket_cookie(skb)
+ *     Get the cookie for the socket stored inside sk_buff.
+ *     @skb: pointer to skb
+ *     Return: 8 Bytes non-decreasing number on success or 0 if the socket
+ *     field is missing inside sk_buff
+ *
+ * u32 bpf_get_socket_uid(skb)
+ *     Get the owner uid of the socket stored inside sk_buff.
+ *     @skb: pointer to skb
+ *     Return: uid of the socket owner on success or overflowuid if failed.
+ *
+ * u32 bpf_set_hash(skb, hash)
+ *     Set full skb->hash.
+ *     @skb: pointer to skb
+ *     @hash: hash to set
+ *
+ * int bpf_setsockopt(bpf_socket, level, optname, optval, optlen)
+ *     Calls setsockopt. Not all opts are available, only those with
+ *     integer optvals plus TCP_CONGESTION.
+ *     Supported levels: SOL_SOCKET and IPPROTO_TCP
+ *     @bpf_socket: pointer to bpf_socket
+ *     @level: SOL_SOCKET or IPPROTO_TCP
+ *     @optname: option name
+ *     @optval: pointer to option value
+ *     @optlen: length of optval in bytes
+ *     Return: 0 or negative error
+ *
+ * int bpf_getsockopt(bpf_socket, level, optname, optval, optlen)
+ *     Calls getsockopt. Not all opts are available.
+ *     Supported levels: IPPROTO_TCP
+ *     @bpf_socket: pointer to bpf_socket
+ *     @level: IPPROTO_TCP
+ *     @optname: option name
+ *     @optval: pointer to option value
+ *     @optlen: length of optval in bytes
+ *     Return: 0 or negative error
+ *
+ * int bpf_sock_ops_cb_flags_set(bpf_sock_ops, flags)
+ *     Set callback flags for sock_ops
+ *     @bpf_sock_ops: pointer to bpf_sock_ops_kern struct
+ *     @flags: flags value
+ *     Return: 0 for no error
+ *             -EINVAL if there is no full tcp socket
+ *             bits in flags that are not supported by current kernel
+ *
+ * int bpf_skb_adjust_room(skb, len_diff, mode, flags)
+ *     Grow or shrink room in sk_buff.
+ *     @skb: pointer to skb
+ *     @len_diff: (signed) amount of room to grow/shrink
+ *     @mode: operation mode (enum bpf_adj_room_mode)
+ *     @flags: reserved for future use
+ *     Return: 0 on success or negative error code
+ *
+ * int bpf_sk_redirect_map(map, key, flags)
+ *     Redirect skb to a sock in map using key as a lookup key for the
+ *     sock in map.
+ *     @map: pointer to sockmap
+ *     @key: key to lookup sock in map
+ *     @flags: reserved for future use
+ *     Return: SK_PASS
+ *
+ * int bpf_sock_map_update(skops, map, key, flags)
+ *	@skops: pointer to bpf_sock_ops
+ *	@map: pointer to sockmap to update
+ *	@key: key to insert/update sock in map
+ *	@flags: same flags as map update elem
+ *
+ * int bpf_xdp_adjust_meta(xdp_md, delta)
+ *     Adjust the xdp_md.data_meta by delta
+ *     @xdp_md: pointer to xdp_md
+ *     @delta: An positive/negative integer to be added to xdp_md.data_meta
+ *     Return: 0 on success or negative on error
+ *
+ * int bpf_perf_event_read_value(map, flags, buf, buf_size)
+ *     read perf event counter value and perf event enabled/running time
+ *     @map: pointer to perf_event_array map
+ *     @flags: index of event in the map or bitmask flags
+ *     @buf: buf to fill
+ *     @buf_size: size of the buf
+ *     Return: 0 on success or negative error code
+ *
+ * int bpf_perf_prog_read_value(ctx, buf, buf_size)
+ *     read perf prog attached perf event counter and enabled/running time
+ *     @ctx: pointer to ctx
+ *     @buf: buf to fill
+ *     @buf_size: size of the buf
+ *     Return : 0 on success or negative error code
+ *
+ * int bpf_override_return(pt_regs, rc)
+ *	@pt_regs: pointer to struct pt_regs
+ *	@rc: the return value to set
+ */
+#define __BPF_FUNC_MAPPER(FN)		\
+        FN(unspec),			\
+        FN(map_lookup_elem),		\
+        FN(map_update_elem),		\
+        FN(map_delete_elem),		\
+        FN(probe_read),			\
+        FN(ktime_get_ns),		\
+        FN(trace_printk),		\
+        FN(get_prandom_u32),		\
+        FN(get_smp_processor_id),	\
+        FN(skb_store_bytes),		\
+        FN(l3_csum_replace),		\
+        FN(l4_csum_replace),		\
+        FN(tail_call),			\
+        FN(clone_redirect),		\
+        FN(get_current_pid_tgid),	\
+        FN(get_current_uid_gid),	\
+        FN(get_current_comm),		\
+        FN(get_cgroup_classid),		\
+        FN(skb_vlan_push),		\
+        FN(skb_vlan_pop),		\
+        FN(skb_get_tunnel_key),		\
+        FN(skb_set_tunnel_key),		\
+        FN(perf_event_read),		\
+        FN(redirect),			\
+        FN(get_route_realm),		\
+        FN(perf_event_output),		\
+        FN(skb_load_bytes),		\
+        FN(get_stackid),		\
+        FN(csum_diff),			\
+        FN(skb_get_tunnel_opt),		\
+        FN(skb_set_tunnel_opt),		\
+        FN(skb_change_proto),		\
+        FN(skb_change_type),		\
+        FN(skb_under_cgroup),		\
+        FN(get_hash_recalc),		\
+        FN(get_current_task),		\
+        FN(probe_write_user),		\
+        FN(current_task_under_cgroup),	\
+        FN(skb_change_tail),		\
+        FN(skb_pull_data),		\
+        FN(csum_update),		\
+        FN(set_hash_invalid),		\
+        FN(get_numa_node_id),		\
+        FN(skb_change_head),		\
+        FN(xdp_adjust_head),		\
+        FN(probe_read_str),		\
+        FN(get_socket_cookie),		\
+        FN(get_socket_uid),		\
+        FN(set_hash),			\
+        FN(setsockopt),			\
+        FN(skb_adjust_room),		\
+        FN(redirect_map),		\
+        FN(sk_redirect_map),		\
+        FN(sock_map_update),		\
+        FN(xdp_adjust_meta),		\
+        FN(perf_event_read_value),	\
+        FN(perf_prog_read_value),	\
+        FN(getsockopt),			\
+        FN(override_return),		\
+        FN(sock_ops_cb_flags_set),
+
+/* integer value in 'imm' field of BPF_CALL instruction selects which helper
+ * function eBPF program intends to call
+ */
+#define __BPF_ENUM_FN(x) BPF_FUNC_ ## x
+enum bpf_func_id {
+        __BPF_FUNC_MAPPER(__BPF_ENUM_FN)
+        __BPF_FUNC_MAX_ID,
+};
+#undef __BPF_ENUM_FN
+
+/* All flags used by eBPF helper functions, placed here. */
+
+/* BPF_FUNC_skb_store_bytes flags. */
+#define BPF_F_RECOMPUTE_CSUM		(1ULL << 0)
+#define BPF_F_INVALIDATE_HASH		(1ULL << 1)
+
+/* BPF_FUNC_l3_csum_replace and BPF_FUNC_l4_csum_replace flags.
+ * First 4 bits are for passing the header field size.
+ */
+#define BPF_F_HDR_FIELD_MASK		0xfULL
+
+/* BPF_FUNC_l4_csum_replace flags. */
+#define BPF_F_PSEUDO_HDR		(1ULL << 4)
+#define BPF_F_MARK_MANGLED_0		(1ULL << 5)
+#define BPF_F_MARK_ENFORCE		(1ULL << 6)
+
+/* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */
+#define BPF_F_INGRESS			(1ULL << 0)
+
+/* BPF_FUNC_skb_set_tunnel_key and BPF_FUNC_skb_get_tunnel_key flags. */
+#define BPF_F_TUNINFO_IPV6		(1ULL << 0)
+
+/* BPF_FUNC_get_stackid flags. */
+#define BPF_F_SKIP_FIELD_MASK		0xffULL
+#define BPF_F_USER_STACK		(1ULL << 8)
+#define BPF_F_FAST_STACK_CMP		(1ULL << 9)
+#define BPF_F_REUSE_STACKID		(1ULL << 10)
+
+/* BPF_FUNC_skb_set_tunnel_key flags. */
+#define BPF_F_ZERO_CSUM_TX		(1ULL << 1)
+#define BPF_F_DONT_FRAGMENT		(1ULL << 2)
+
+/* BPF_FUNC_perf_event_output, BPF_FUNC_perf_event_read and
+ * BPF_FUNC_perf_event_read_value flags.
+ */
+#define BPF_F_INDEX_MASK		0xffffffffULL
+#define BPF_F_CURRENT_CPU		BPF_F_INDEX_MASK
+/* BPF_FUNC_perf_event_output for sk_buff input context. */
+#define BPF_F_CTXLEN_MASK		(0xfffffULL << 32)
+
+/* Mode for BPF_FUNC_skb_adjust_room helper. */
+enum bpf_adj_room_mode {
+        BPF_ADJ_ROOM_NET,
+};
+
+/* user accessible mirror of in-kernel sk_buff.
+ * new fields can only be added to the end of this structure
+ */
+struct __sk_buff {
+        __u32 len;
+        __u32 pkt_type;
+        __u32 mark;
+        __u32 queue_mapping;
+        __u32 protocol;
+        __u32 vlan_present;
+        __u32 vlan_tci;
+        __u32 vlan_proto;
+        __u32 priority;
+        __u32 ingress_ifindex;
+        __u32 ifindex;
+        __u32 tc_index;
+        __u32 cb[5];
+        __u32 hash;
+        __u32 tc_classid;
+        __u32 data;
+        __u32 data_end;
+        __u32 napi_id;
+
+        /* Accessed by BPF_PROG_TYPE_sk_skb types from here to ... */
+        __u32 family;
+        __u32 remote_ip4;	/* Stored in network byte order */
+        __u32 local_ip4;	/* Stored in network byte order */
+        __u32 remote_ip6[4];	/* Stored in network byte order */
+        __u32 local_ip6[4];	/* Stored in network byte order */
+        __u32 remote_port;	/* Stored in network byte order */
+        __u32 local_port;	/* stored in host byte order */
+        /* ... here. */
+
+        __u32 data_meta;
+};
+
+struct bpf_tunnel_key {
+        __u32 tunnel_id;
+        union {
+                __u32 remote_ipv4;
+                __u32 remote_ipv6[4];
+        };
+        __u8 tunnel_tos;
+        __u8 tunnel_ttl;
+        __u16 tunnel_ext;
+        __u32 tunnel_label;
+};
+
+/* Generic BPF return codes which all BPF program types may support.
+ * The values are binary compatible with their TC_ACT_* counter-part to
+ * provide backwards compatibility with existing SCHED_CLS and SCHED_ACT
+ * programs.
+ *
+ * XDP is handled seprately, see XDP_*.
+ */
+enum bpf_ret_code {
+        BPF_OK = 0,
+        /* 1 reserved */
+        BPF_DROP = 2,
+        /* 3-6 reserved */
+        BPF_REDIRECT = 7,
+        /* >127 are reserved for prog type specific return codes */
+};
+
+struct bpf_sock {
+        __u32 bound_dev_if;
+        __u32 family;
+        __u32 type;
+        __u32 protocol;
+        __u32 mark;
+        __u32 priority;
+};
+
+#define XDP_PACKET_HEADROOM 256
+
+/* User return codes for XDP prog type.
+ * A valid XDP program must return one of these defined values. All other
+ * return codes are reserved for future use. Unknown return codes will
+ * result in packet drops and a warning via bpf_warn_invalid_xdp_action().
+ */
+enum xdp_action {
+        XDP_ABORTED = 0,
+        XDP_DROP,
+        XDP_PASS,
+        XDP_TX,
+        XDP_REDIRECT,
+};
+
+/* user accessible metadata for XDP packet hook
+ * new fields must be added to the end of this structure
+ */
+struct xdp_md {
+        __u32 data;
+        __u32 data_end;
+        __u32 data_meta;
+        /* Below access go through struct xdp_rxq_info */
+        __u32 ingress_ifindex; /* rxq->dev->ifindex */
+        __u32 rx_queue_index;  /* rxq->queue_index  */
+};
+
+enum sk_action {
+        SK_DROP = 0,
+        SK_PASS,
+};
+
+#define BPF_TAG_SIZE	8
+
+struct bpf_prog_info {
+        __u32 type;
+        __u32 id;
+        __u8  tag[BPF_TAG_SIZE];
+        __u32 jited_prog_len;
+        __u32 xlated_prog_len;
+        __aligned_u64 jited_prog_insns;
+        __aligned_u64 xlated_prog_insns;
+        __u64 load_time;	/* ns since boottime */
+        __u32 created_by_uid;
+        __u32 nr_map_ids;
+        __aligned_u64 map_ids;
+        char name[BPF_OBJ_NAME_LEN];
+        __u32 ifindex;
+        __u64 netns_dev;
+        __u64 netns_ino;
+} __attribute__((aligned(8)));
+
+struct bpf_map_info {
+        __u32 type;
+        __u32 id;
+        __u32 key_size;
+        __u32 value_size;
+        __u32 max_entries;
+        __u32 map_flags;
+        char  name[BPF_OBJ_NAME_LEN];
+        __u32 ifindex;
+        __u64 netns_dev;
+        __u64 netns_ino;
+} __attribute__((aligned(8)));
+
+/* User bpf_sock_ops struct to access socket values and specify request ops
+ * and their replies.
+ * Some of this fields are in network (bigendian) byte order and may need
+ * to be converted before use (bpf_ntohl() defined in samples/bpf/bpf_endian.h).
+ * New fields can only be added at the end of this structure
+ */
+struct bpf_sock_ops {
+        __u32 op;
+        union {
+                __u32 args[4];		/* Optionally passed to bpf program */
+                __u32 reply;		/* Returned by bpf program	    */
+                __u32 replylong[4];	/* Optionally returned by bpf prog  */
+        };
+        __u32 family;
+        __u32 remote_ip4;	/* Stored in network byte order */
+        __u32 local_ip4;	/* Stored in network byte order */
+        __u32 remote_ip6[4];	/* Stored in network byte order */
+        __u32 local_ip6[4];	/* Stored in network byte order */
+        __u32 remote_port;	/* Stored in network byte order */
+        __u32 local_port;	/* stored in host byte order */
+        __u32 is_fullsock;	/* Some TCP fields are only valid if
+                                 * there is a full socket. If not, the
+                                 * fields read as zero.
+                                 */
+        __u32 snd_cwnd;
+        __u32 srtt_us;		/* Averaged RTT << 3 in usecs */
+        __u32 bpf_sock_ops_cb_flags; /* flags defined in uapi/linux/tcp.h */
+        __u32 state;
+        __u32 rtt_min;
+        __u32 snd_ssthresh;
+        __u32 rcv_nxt;
+        __u32 snd_nxt;
+        __u32 snd_una;
+        __u32 mss_cache;
+        __u32 ecn_flags;
+        __u32 rate_delivered;
+        __u32 rate_interval_us;
+        __u32 packets_out;
+        __u32 retrans_out;
+        __u32 total_retrans;
+        __u32 segs_in;
+        __u32 data_segs_in;
+        __u32 segs_out;
+        __u32 data_segs_out;
+        __u32 lost_out;
+        __u32 sacked_out;
+        __u32 sk_txhash;
+        __u64 bytes_received;
+        __u64 bytes_acked;
+};
+
+/* Definitions for bpf_sock_ops_cb_flags */
+#define BPF_SOCK_OPS_RTO_CB_FLAG	(1<<0)
+#define BPF_SOCK_OPS_RETRANS_CB_FLAG	(1<<1)
+#define BPF_SOCK_OPS_STATE_CB_FLAG	(1<<2)
+#define BPF_SOCK_OPS_ALL_CB_FLAGS       0x7		/* Mask of all currently
+                                                         * supported cb flags
+                                                         */
+
+/* List of known BPF sock_ops operators.
+ * New entries can only be added at the end
+ */
+enum {
+        BPF_SOCK_OPS_VOID,
+        BPF_SOCK_OPS_TIMEOUT_INIT,	/* Should return SYN-RTO value to use or
+                                         * -1 if default value should be used
+                                         */
+        BPF_SOCK_OPS_RWND_INIT,		/* Should return initial advertized
+                                         * window (in packets) or -1 if default
+                                         * value should be used
+                                         */
+        BPF_SOCK_OPS_TCP_CONNECT_CB,	/* Calls BPF program right before an
+                                         * active connection is initialized
+                                         */
+        BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB,	/* Calls BPF program when an
+                                                 * active connection is
+                                                 * established
+                                                 */
+        BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB,	/* Calls BPF program when a
+                                                 * passive connection is
+                                                 * established
+                                                 */
+        BPF_SOCK_OPS_NEEDS_ECN,		/* If connection's congestion control
+                                         * needs ECN
+                                         */
+        BPF_SOCK_OPS_BASE_RTT,		/* Get base RTT. The correct value is
+                                         * based on the path and may be
+                                         * dependent on the congestion control
+                                         * algorithm. In general it indicates
+                                         * a congestion threshold. RTTs above
+                                         * this indicate congestion
+                                         */
+        BPF_SOCK_OPS_RTO_CB,		/* Called when an RTO has triggered.
+                                         * Arg1: value of icsk_retransmits
+                                         * Arg2: value of icsk_rto
+                                         * Arg3: whether RTO has expired
+                                         */
+        BPF_SOCK_OPS_RETRANS_CB,	/* Called when skb is retransmitted.
+                                         * Arg1: sequence number of 1st byte
+                                         * Arg2: # segments
+                                         * Arg3: return value of
+                                         *       tcp_transmit_skb (0 => success)
+                                         */
+        BPF_SOCK_OPS_STATE_CB,		/* Called when TCP changes state.
+                                         * Arg1: old_state
+                                         * Arg2: new_state
+                                         */
+};
+
+/* List of TCP states. There is a build check in net/ipv4/tcp.c to detect
+ * changes between the TCP and BPF versions. Ideally this should never happen.
+ * If it does, we need to add code to convert them before calling
+ * the BPF sock_ops function.
+ */
+enum {
+        BPF_TCP_ESTABLISHED = 1,
+        BPF_TCP_SYN_SENT,
+        BPF_TCP_SYN_RECV,
+        BPF_TCP_FIN_WAIT1,
+        BPF_TCP_FIN_WAIT2,
+        BPF_TCP_TIME_WAIT,
+        BPF_TCP_CLOSE,
+        BPF_TCP_CLOSE_WAIT,
+        BPF_TCP_LAST_ACK,
+        BPF_TCP_LISTEN,
+        BPF_TCP_CLOSING,	/* Now a valid state */
+        BPF_TCP_NEW_SYN_RECV,
+
+        BPF_TCP_MAX_STATES	/* Leave at the end! */
+};
+
+#define TCP_BPF_IW		1001	/* Set TCP initial congestion window */
+#define TCP_BPF_SNDCWND_CLAMP	1002	/* Set sndcwnd_clamp */
+
+struct bpf_perf_event_value {
+        __u64 counter;
+        __u64 enabled;
+        __u64 running;
+};
+
+#define BPF_DEVCG_ACC_MKNOD	(1ULL << 0)
+#define BPF_DEVCG_ACC_READ	(1ULL << 1)
+#define BPF_DEVCG_ACC_WRITE	(1ULL << 2)
+
+#define BPF_DEVCG_DEV_BLOCK	(1ULL << 0)
+#define BPF_DEVCG_DEV_CHAR	(1ULL << 1)
+
+struct bpf_cgroup_dev_ctx {
+        /* access_type encoded as (BPF_DEVCG_ACC_* << 16) | BPF_DEVCG_DEV_* */
+        __u32 access_type;
+        __u32 major;
+        __u32 minor;
+};
+
+#endif /* _UAPI__LINUX_BPF_H__ */
diff --git a/src/shared/linux/bpf_common.h b/src/shared/linux/bpf_common.h
new file mode 100644
index 0000000..afe7433
--- /dev/null
+++ b/src/shared/linux/bpf_common.h
@@ -0,0 +1,55 @@
+#ifndef __LINUX_BPF_COMMON_H__
+#define __LINUX_BPF_COMMON_H__
+
+/* Instruction classes */
+#define BPF_CLASS(code) ((code) & 0x07)
+#define		BPF_LD		0x00
+#define		BPF_LDX		0x01
+#define		BPF_ST		0x02
+#define		BPF_STX		0x03
+#define		BPF_ALU		0x04
+#define		BPF_JMP		0x05
+#define		BPF_RET		0x06
+#define		BPF_MISC        0x07
+
+/* ld/ldx fields */
+#define BPF_SIZE(code)  ((code) & 0x18)
+#define		BPF_W		0x00
+#define		BPF_H		0x08
+#define		BPF_B		0x10
+#define BPF_MODE(code)  ((code) & 0xe0)
+#define		BPF_IMM		0x00
+#define		BPF_ABS		0x20
+#define		BPF_IND		0x40
+#define		BPF_MEM		0x60
+#define		BPF_LEN		0x80
+#define		BPF_MSH		0xa0
+
+/* alu/jmp fields */
+#define BPF_OP(code)    ((code) & 0xf0)
+#define		BPF_ADD		0x00
+#define		BPF_SUB		0x10
+#define		BPF_MUL		0x20
+#define		BPF_DIV		0x30
+#define		BPF_OR		0x40
+#define		BPF_AND		0x50
+#define		BPF_LSH		0x60
+#define		BPF_RSH		0x70
+#define		BPF_NEG		0x80
+#define		BPF_MOD		0x90
+#define		BPF_XOR		0xa0
+
+#define		BPF_JA		0x00
+#define		BPF_JEQ		0x10
+#define		BPF_JGT		0x20
+#define		BPF_JGE		0x30
+#define		BPF_JSET        0x40
+#define BPF_SRC(code)   ((code) & 0x08)
+#define		BPF_K		0x00
+#define		BPF_X		0x08
+
+#ifndef BPF_MAXINSNS
+#define BPF_MAXINSNS 4096
+#endif
+
+#endif /* __LINUX_BPF_COMMON_H__ */
diff --git a/src/shared/linux/libbpf.h b/src/shared/linux/libbpf.h
new file mode 100644
index 0000000..391eee5
--- /dev/null
+++ b/src/shared/linux/libbpf.h
@@ -0,0 +1,207 @@
+/* eBPF mini library */
+#ifndef __LIBBPF_H
+#define __LIBBPF_H
+
+#include <linux/bpf.h>
+
+struct bpf_insn;
+
+/* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */
+
+#define BPF_ALU64_REG(OP, DST, SRC)				\
+        ((struct bpf_insn) {					\
+                .code  = BPF_ALU64 | BPF_OP(OP) | BPF_X,	\
+                .dst_reg = DST,					\
+                .src_reg = SRC,					\
+                .off   = 0,					\
+                .imm   = 0 })
+
+#define BPF_ALU32_REG(OP, DST, SRC)				\
+        ((struct bpf_insn) {					\
+                .code  = BPF_ALU | BPF_OP(OP) | BPF_X,		\
+                .dst_reg = DST,					\
+                .src_reg = SRC,					\
+                .off   = 0,					\
+                .imm   = 0 })
+
+/* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */
+
+#define BPF_ALU64_IMM(OP, DST, IMM)				\
+        ((struct bpf_insn) {					\
+                .code  = BPF_ALU64 | BPF_OP(OP) | BPF_K,	\
+                .dst_reg = DST,					\
+                .src_reg = 0,					\
+                .off   = 0,					\
+                .imm   = IMM })
+
+#define BPF_ALU32_IMM(OP, DST, IMM)				\
+        ((struct bpf_insn) {					\
+                .code  = BPF_ALU | BPF_OP(OP) | BPF_K,		\
+                .dst_reg = DST,					\
+                .src_reg = 0,					\
+                .off   = 0,					\
+                .imm   = IMM })
+
+/* Short form of mov, dst_reg = src_reg */
+
+#define BPF_MOV64_REG(DST, SRC)					\
+        ((struct bpf_insn) {					\
+                .code  = BPF_ALU64 | BPF_MOV | BPF_X,		\
+                .dst_reg = DST,					\
+                .src_reg = SRC,					\
+                .off   = 0,					\
+                .imm   = 0 })
+
+#define BPF_MOV32_REG(DST, SRC)					\
+        ((struct bpf_insn) {					\
+                .code  = BPF_ALU | BPF_MOV | BPF_X,		\
+                .dst_reg = DST,					\
+                .src_reg = SRC,					\
+                .off   = 0,					\
+                .imm   = 0 })
+
+/* Short form of mov, dst_reg = imm32 */
+
+#define BPF_MOV64_IMM(DST, IMM)					\
+        ((struct bpf_insn) {					\
+                .code  = BPF_ALU64 | BPF_MOV | BPF_K,		\
+                .dst_reg = DST,					\
+                .src_reg = 0,					\
+                .off   = 0,					\
+                .imm   = IMM })
+
+#define BPF_MOV32_IMM(DST, IMM)					\
+        ((struct bpf_insn) {					\
+                .code  = BPF_ALU | BPF_MOV | BPF_K,		\
+                .dst_reg = DST,					\
+                .src_reg = 0,					\
+                .off   = 0,					\
+                .imm   = IMM })
+
+/* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */
+#define BPF_LD_IMM64(DST, IMM)					\
+        BPF_LD_IMM64_RAW(DST, 0, IMM)
+
+#define BPF_LD_IMM64_RAW(DST, SRC, IMM)				\
+        ((struct bpf_insn) {					\
+                .code  = BPF_LD | BPF_DW | BPF_IMM,		\
+                .dst_reg = DST,					\
+                .src_reg = SRC,					\
+                .off   = 0,					\
+                .imm   = (__u32) (IMM) }),			\
+        ((struct bpf_insn) {					\
+                .code  = 0, /* zero is reserved opcode */	\
+                .dst_reg = 0,					\
+                .src_reg = 0,					\
+                .off   = 0,					\
+                .imm   = ((__u64) (IMM)) >> 32 })
+
+#ifndef BPF_PSEUDO_MAP_FD
+# define BPF_PSEUDO_MAP_FD	1
+#endif
+
+/* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */
+#define BPF_LD_MAP_FD(DST, MAP_FD)				\
+        BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)
+
+/* Direct packet access, R0 = *(uint *) (skb->data + imm32) */
+
+#define BPF_LD_ABS(SIZE, IMM)					\
+        ((struct bpf_insn) {					\
+                .code  = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS,	\
+                .dst_reg = 0,					\
+                .src_reg = 0,					\
+                .off   = 0,					\
+                .imm   = IMM })
+
+/* Memory load, dst_reg = *(uint *) (src_reg + off16) */
+
+#define BPF_LDX_MEM(SIZE, DST, SRC, OFF)			\
+        ((struct bpf_insn) {					\
+                .code  = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM,	\
+                .dst_reg = DST,					\
+                .src_reg = SRC,					\
+                .off   = OFF,					\
+                .imm   = 0 })
+
+/* Memory store, *(uint *) (dst_reg + off16) = src_reg */
+
+#define BPF_STX_MEM(SIZE, DST, SRC, OFF)			\
+        ((struct bpf_insn) {					\
+                .code  = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM,	\
+                .dst_reg = DST,					\
+                .src_reg = SRC,					\
+                .off   = OFF,					\
+                .imm   = 0 })
+
+/* Atomic memory add, *(uint *)(dst_reg + off16) += src_reg */
+
+#define BPF_STX_XADD(SIZE, DST, SRC, OFF)			\
+        ((struct bpf_insn) {					\
+                .code  = BPF_STX | BPF_SIZE(SIZE) | BPF_XADD,	\
+                .dst_reg = DST,					\
+                .src_reg = SRC,					\
+                .off   = OFF,					\
+                .imm   = 0 })
+
+/* Memory store, *(uint *) (dst_reg + off16) = imm32 */
+
+#define BPF_ST_MEM(SIZE, DST, OFF, IMM)				\
+        ((struct bpf_insn) {					\
+                .code  = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM,	\
+                .dst_reg = DST,					\
+                .src_reg = 0,					\
+                .off   = OFF,					\
+                .imm   = IMM })
+
+/* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */
+
+#define BPF_JMP_REG(OP, DST, SRC, OFF)				\
+        ((struct bpf_insn) {					\
+                .code  = BPF_JMP | BPF_OP(OP) | BPF_X,		\
+                .dst_reg = DST,					\
+                .src_reg = SRC,					\
+                .off   = OFF,					\
+                .imm   = 0 })
+
+/* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */
+
+#define BPF_JMP_IMM(OP, DST, IMM, OFF)				\
+        ((struct bpf_insn) {					\
+                .code  = BPF_JMP | BPF_OP(OP) | BPF_K,		\
+                .dst_reg = DST,					\
+                .src_reg = 0,					\
+                .off   = OFF,					\
+                .imm   = IMM })
+
+/* Unconditional jumps */
+
+#define BPF_JMP_A(OFF)						\
+        ((struct bpf_insn) {					\
+                .code  = BPF_JMP | BPF_JA,			\
+                .dst_reg = 0,					\
+                .src_reg = 0,					\
+                .off   = OFF,					\
+                .imm   = 0 })
+
+/* Raw code statement block */
+
+#define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM)			\
+        ((struct bpf_insn) {					\
+                .code  = CODE,					\
+                .dst_reg = DST,					\
+                .src_reg = SRC,					\
+                .off   = OFF,					\
+                .imm   = IMM })
+
+/* Program exit */
+
+#define BPF_EXIT_INSN()						\
+        ((struct bpf_insn) {					\
+                .code  = BPF_JMP | BPF_EXIT,			\
+                .dst_reg = 0,					\
+                .src_reg = 0,					\
+                .off   = 0,					\
+                .imm   = 0 })
+
+#endif