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bpf: add 'flags' attribute to BPF_MAP_UPDATE_ELEM command
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1/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
2 *
3 * This program is free software; you can redistribute it and/or
4 * modify it under the terms of version 2 of the GNU General Public
5 * License as published by the Free Software Foundation.
6 */
7#ifndef _UAPI__LINUX_BPF_H__
8#define _UAPI__LINUX_BPF_H__
9
10#include <linux/types.h>
c15952dc 11#include <linux/bpf_common.h>
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12
13/* Extended instruction set based on top of classic BPF */
14
15/* instruction classes */
16#define BPF_ALU64 0x07 /* alu mode in double word width */
17
18/* ld/ldx fields */
19#define BPF_DW 0x18 /* double word */
20#define BPF_XADD 0xc0 /* exclusive add */
21
22/* alu/jmp fields */
23#define BPF_MOV 0xb0 /* mov reg to reg */
24#define BPF_ARSH 0xc0 /* sign extending arithmetic shift right */
25
26/* change endianness of a register */
27#define BPF_END 0xd0 /* flags for endianness conversion: */
28#define BPF_TO_LE 0x00 /* convert to little-endian */
29#define BPF_TO_BE 0x08 /* convert to big-endian */
30#define BPF_FROM_LE BPF_TO_LE
31#define BPF_FROM_BE BPF_TO_BE
32
33#define BPF_JNE 0x50 /* jump != */
34#define BPF_JSGT 0x60 /* SGT is signed '>', GT in x86 */
35#define BPF_JSGE 0x70 /* SGE is signed '>=', GE in x86 */
36#define BPF_CALL 0x80 /* function call */
37#define BPF_EXIT 0x90 /* function return */
38
39/* Register numbers */
40enum {
41 BPF_REG_0 = 0,
42 BPF_REG_1,
43 BPF_REG_2,
44 BPF_REG_3,
45 BPF_REG_4,
46 BPF_REG_5,
47 BPF_REG_6,
48 BPF_REG_7,
49 BPF_REG_8,
50 BPF_REG_9,
51 BPF_REG_10,
52 __MAX_BPF_REG,
53};
54
55/* BPF has 10 general purpose 64-bit registers and stack frame. */
56#define MAX_BPF_REG __MAX_BPF_REG
57
58struct bpf_insn {
59 __u8 code; /* opcode */
60 __u8 dst_reg:4; /* dest register */
61 __u8 src_reg:4; /* source register */
62 __s16 off; /* signed offset */
63 __s32 imm; /* signed immediate constant */
64};
65
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66/* BPF syscall commands */
67enum bpf_cmd {
68 /* create a map with given type and attributes
69 * fd = bpf(BPF_MAP_CREATE, union bpf_attr *, u32 size)
70 * returns fd or negative error
71 * map is deleted when fd is closed
72 */
73 BPF_MAP_CREATE,
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74
75 /* lookup key in a given map
76 * err = bpf(BPF_MAP_LOOKUP_ELEM, union bpf_attr *attr, u32 size)
77 * Using attr->map_fd, attr->key, attr->value
78 * returns zero and stores found elem into value
79 * or negative error
80 */
81 BPF_MAP_LOOKUP_ELEM,
82
83 /* create or update key/value pair in a given map
84 * err = bpf(BPF_MAP_UPDATE_ELEM, union bpf_attr *attr, u32 size)
3274f520 85 * Using attr->map_fd, attr->key, attr->value, attr->flags
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86 * returns zero or negative error
87 */
88 BPF_MAP_UPDATE_ELEM,
89
90 /* find and delete elem by key in a given map
91 * err = bpf(BPF_MAP_DELETE_ELEM, union bpf_attr *attr, u32 size)
92 * Using attr->map_fd, attr->key
93 * returns zero or negative error
94 */
95 BPF_MAP_DELETE_ELEM,
96
97 /* lookup key in a given map and return next key
98 * err = bpf(BPF_MAP_GET_NEXT_KEY, union bpf_attr *attr, u32 size)
99 * Using attr->map_fd, attr->key, attr->next_key
100 * returns zero and stores next key or negative error
101 */
102 BPF_MAP_GET_NEXT_KEY,
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103
104 /* verify and load eBPF program
105 * prog_fd = bpf(BPF_PROG_LOAD, union bpf_attr *attr, u32 size)
106 * Using attr->prog_type, attr->insns, attr->license
107 * returns fd or negative error
108 */
109 BPF_PROG_LOAD,
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110};
111
112enum bpf_map_type {
113 BPF_MAP_TYPE_UNSPEC,
114};
115
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116enum bpf_prog_type {
117 BPF_PROG_TYPE_UNSPEC,
118};
119
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120/* flags for BPF_MAP_UPDATE_ELEM command */
121#define BPF_ANY 0 /* create new element or update existing */
122#define BPF_NOEXIST 1 /* create new element if it didn't exist */
123#define BPF_EXIST 2 /* update existing element */
124
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125union bpf_attr {
126 struct { /* anonymous struct used by BPF_MAP_CREATE command */
127 __u32 map_type; /* one of enum bpf_map_type */
128 __u32 key_size; /* size of key in bytes */
129 __u32 value_size; /* size of value in bytes */
130 __u32 max_entries; /* max number of entries in a map */
131 };
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132
133 struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */
134 __u32 map_fd;
135 __aligned_u64 key;
136 union {
137 __aligned_u64 value;
138 __aligned_u64 next_key;
139 };
3274f520 140 __u64 flags;
db20fd2b 141 };
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142
143 struct { /* anonymous struct used by BPF_PROG_LOAD command */
144 __u32 prog_type; /* one of enum bpf_prog_type */
145 __u32 insn_cnt;
146 __aligned_u64 insns;
147 __aligned_u64 license;
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148 __u32 log_level; /* verbosity level of verifier */
149 __u32 log_size; /* size of user buffer */
150 __aligned_u64 log_buf; /* user supplied buffer */
09756af4 151 };
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152} __attribute__((aligned(8)));
153
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154/* integer value in 'imm' field of BPF_CALL instruction selects which helper
155 * function eBPF program intends to call
156 */
157enum bpf_func_id {
158 BPF_FUNC_unspec,
159 __BPF_FUNC_MAX_ID,
160};
161
daedfb22 162#endif /* _UAPI__LINUX_BPF_H__ */