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annotate src/core/ngx_bpf.c @ 9299:2706b60dc225 default tip

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Core: error logging rate limiting. With this change, error logging to files can be rate-limited with the "rate=" parameter. The parameter specifies allowed log messages rate to a particular file (per worker), in messages per second (m/s). By default, "rate=1000m/s" is used. Rate limiting is implemented using the "leaky bucket" method, similarly to the limit_req module. Maximum burst size is set to the number of log messages per second for each severity level, so "error" messages are logged even if the rate limit is hit by "info" messages (but not vice versa). When the limit is reached for a particular level, the "too many log messages, limiting" message is logged at this level. If debug logging is enabled, either for the particular log file or for the particular connection, rate limiting is not used.
author Maxim Dounin <mdounin@mdounin.ru>
date Tue, 25 Jun 2024 22:58:56 +0300
parents 7a07724256c2
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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2 /*
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3 * Copyright (C) Nginx, Inc.
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9
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10 #define NGX_BPF_LOGBUF_SIZE (16 * 1024)
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11
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12
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13 static ngx_inline int
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14 ngx_bpf(enum bpf_cmd cmd, union bpf_attr *attr, unsigned int size)
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15 {
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16 return syscall(__NR_bpf, cmd, attr, size);
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17 }
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19
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20 void
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21 ngx_bpf_program_link(ngx_bpf_program_t *program, const char *symbol, int fd)
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22 {
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23 ngx_uint_t i;
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24 ngx_bpf_reloc_t *rl;
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26 rl = program->relocs;
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27
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28 for (i = 0; i < program->nrelocs; i++) {
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29 if (ngx_strcmp(rl[i].name, symbol) == 0) {
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30 program->ins[rl[i].offset].src_reg = 1;
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31 program->ins[rl[i].offset].imm = fd;
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32 }
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33 }
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34 }
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37 int
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38 ngx_bpf_load_program(ngx_log_t *log, ngx_bpf_program_t *program)
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39 {
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40 int fd;
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41 union bpf_attr attr;
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42 #if (NGX_DEBUG)
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43 char buf[NGX_BPF_LOGBUF_SIZE];
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44 #endif
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45
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46 ngx_memzero(&attr, sizeof(union bpf_attr));
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47
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48 attr.license = (uintptr_t) program->license;
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49 attr.prog_type = program->type;
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50 attr.insns = (uintptr_t) program->ins;
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51 attr.insn_cnt = program->nins;
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52
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53 #if (NGX_DEBUG)
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54 /* for verifier errors */
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55 attr.log_buf = (uintptr_t) buf;
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56 attr.log_size = NGX_BPF_LOGBUF_SIZE;
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57 attr.log_level = 1;
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58 #endif
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59
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60 fd = ngx_bpf(BPF_PROG_LOAD, &attr, sizeof(attr));
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61 if (fd < 0) {
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62 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
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63 "failed to load BPF program");
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64
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65 ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0,
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66 "bpf verifier: %s", buf);
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67
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68 return -1;
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69 }
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70
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71 return fd;
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72 }
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75 int
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76 ngx_bpf_map_create(ngx_log_t *log, enum bpf_map_type type, int key_size,
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77 int value_size, int max_entries, uint32_t map_flags)
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78 {
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79 int fd;
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80 union bpf_attr attr;
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81
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82 ngx_memzero(&attr, sizeof(union bpf_attr));
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83
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84 attr.map_type = type;
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85 attr.key_size = key_size;
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86 attr.value_size = value_size;
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87 attr.max_entries = max_entries;
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88 attr.map_flags = map_flags;
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89
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90 fd = ngx_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
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91 if (fd < 0) {
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92 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
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93 "failed to create BPF map");
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94 return NGX_ERROR;
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95 }
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96
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97 return fd;
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98 }
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99
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100
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101 int
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102 ngx_bpf_map_update(int fd, const void *key, const void *value, uint64_t flags)
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103 {
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104 union bpf_attr attr;
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105
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106 ngx_memzero(&attr, sizeof(union bpf_attr));
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107
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108 attr.map_fd = fd;
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109 attr.key = (uintptr_t) key;
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110 attr.value = (uintptr_t) value;
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111 attr.flags = flags;
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112
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113 return ngx_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr));
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114 }
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115
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116
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117 int
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118 ngx_bpf_map_delete(int fd, const void *key)
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119 {
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120 union bpf_attr attr;
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121
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122 ngx_memzero(&attr, sizeof(union bpf_attr));
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123
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124 attr.map_fd = fd;
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125 attr.key = (uintptr_t) key;
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126
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127 return ngx_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr));
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128 }
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129
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130
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131 int
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132 ngx_bpf_map_lookup(int fd, const void *key, void *value)
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133 {
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134 union bpf_attr attr;
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135
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136 ngx_memzero(&attr, sizeof(union bpf_attr));
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137
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138 attr.map_fd = fd;
8722
7a07724256c2 Core: fixed build with BPF on non-64bit platforms (ticket #2152).
Vladimir Homutov <vl@nginx.com>
parents: 8675
diff changeset
139 attr.key = (uintptr_t) key;
7a07724256c2 Core: fixed build with BPF on non-64bit platforms (ticket #2152).
Vladimir Homutov <vl@nginx.com>
parents: 8675
diff changeset
140 attr.value = (uintptr_t) value;
8675
d3747ba486e7 Core: added interface to linux bpf() system call.
Vladimir Homutov <vl@nginx.com>
parents:
diff changeset
141
d3747ba486e7 Core: added interface to linux bpf() system call.
Vladimir Homutov <vl@nginx.com>
parents:
diff changeset
142 return ngx_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
d3747ba486e7 Core: added interface to linux bpf() system call.
Vladimir Homutov <vl@nginx.com>
parents:
diff changeset
143 }