tools lib bpf: Copy bpf.h and bpf_common.h from the kernel

To allow the build to complete on older systems, where those files are
either not uptodate, lacking some recent additions or not present at
all.

And check if the copy drifts from the kernel, as in this synthetic test:

    BUILD:   Doing 'make -j4' parallel build
  Warning: tools/include/linux/bpf.h differs from kernel
  Warning: tools/include/linux/bpf_common.h differs from kernel

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-5plvi2gq4x469dcyybiu226q@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 444 insertions, 0 deletions

diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
new file mode 100644
index 000000000000..406459b935a2
--- /dev/null
+++ b/tools/include/uapi/linux/bpf.h
@@ -0,0 +1,389 @@
+/* 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 */
+#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
+
+#define BPF_JNE         0x50    /* jump != */
+#define BPF_JSGT        0x60    /* SGT is signed '>', GT in x86 */
+#define BPF_JSGE        0x70    /* SGE is signed '>=', GE in x86 */
+#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 */
+};
+
+/* 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,
+};
+
+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,
+};
+
+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,
+};
+
+#define BPF_PSEUDO_MAP_FD       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 */
+
+#define BPF_F_NO_PREALLOC       (1U << 0)
+
+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;      /* prealloc or not */
+        };
+
+        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 */
+        };
+
+        struct { /* anonymous struct used by BPF_OBJ_* commands */
+                __aligned_u64   pathname;
+                __u32           bpf_fd;
+        };
+} __attribute__((aligned(8)));
+
+/* integer value in 'imm' field of BPF_CALL instruction selects which helper
+ * function eBPF program intends to call
+ */
+enum bpf_func_id {
+        BPF_FUNC_unspec,
+        BPF_FUNC_map_lookup_elem, /* void *map_lookup_elem(&map, &key) */
+        BPF_FUNC_map_update_elem, /* int map_update_elem(&map, &key, &value, flags) */
+        BPF_FUNC_map_delete_elem, /* int map_delete_elem(&map, &key) */
+        BPF_FUNC_probe_read,      /* int bpf_probe_read(void *dst, int size, void *src) */
+        BPF_FUNC_ktime_get_ns,    /* u64 bpf_ktime_get_ns(void) */
+        BPF_FUNC_trace_printk,    /* int bpf_trace_printk(const char *fmt, int fmt_size, ...) */
+        BPF_FUNC_get_prandom_u32, /* u32 prandom_u32(void) */
+        BPF_FUNC_get_smp_processor_id, /* u32 raw_smp_processor_id(void) */
+
+        /**
+         * 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
+         */
+        BPF_FUNC_skb_store_bytes,
+
+        /**
+         * 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
+         */
+        BPF_FUNC_l3_csum_replace,
+
+        /**
+         * 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
+         */
+        BPF_FUNC_l4_csum_replace,
+
+        /**
+         * 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: index inside array that selects specific program to run
+         * Return: 0 on success
+         */