1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
#include "job_ctx.h"
#include "common.h"
#include "config.h"
#include "maat.h"
#include "trace_output.h"
#include <MESA/maat.h>
#include <cjson/cJSON.h>
#include <pcap.h>
#include <stdlib.h>
#include <string.h>
struct dp_trace_job_occupy
{
uint8_t uesd;
uint8_t role;
};
static struct dp_trace_job_occupy dp_trace_job_occupy[DP_TRACE_JOB_NUM_MAX] = {};
static struct dp_trace_telemetry_desc telemetry_descs[DP_TRACE_JOB_NUM_MAX] = {};
static int telemetry_unused_job_index_get();
void job_rule_apply(struct dp_trace_job_desc desc[], unsigned int nr_desc)
{
int ret = 0;
for (unsigned int i = 0; i < nr_desc; i++)
{
uint8_t rule_index = desc[i].rule_index;
job_bitmap_t cur_job_id = index_to_job_id(rule_index);
uint8_t cur_job_uesd = is_job_id_used(cur_job_id);
// The job that was not originally in the system is now included in the configuration.
if (cur_job_uesd == 0 && desc[i].enable && strlen(desc[i].bpf_expr) != 0)
{
ret = marsio_dp_trace_job_add(mr_instance, &desc[i]);
if (ret == 0)
{
dzlog_error("add rule index %u failed. bpf_expr is: %s", rule_index, desc[i].bpf_expr);
}
else
{
dp_trace_job_occupy[rule_index].uesd = 1;
dp_trace_job_occupy[rule_index].role = desc[i].measurement_type;
dzlog_info("add rule index %u successfully. bpf_expr is: %s", rule_index, desc[i].bpf_expr);
}
continue;
}
// The job that originally existed in the system is not in the configuration now.
if (cur_job_uesd == 1 && (desc[i].enable == false || strlen(desc[i].bpf_expr) == 0))
{
ret = marsio_dp_trace_job_del(mr_instance, cur_job_id);
if (ret < 0)
{
dzlog_error("del rule index %u failed. bpf_expr is: %s", rule_index, desc[i].bpf_expr);
}
else
{
uint8_t tmp_role = dp_trace_job_occupy[rule_index].role;
dp_trace_job_occupy[rule_index].uesd = 0;
dp_trace_job_occupy[rule_index].role = DP_TRACE_NO_ROLE;
if (tmp_role == DP_TRACE_MEASUREMENT_TYPE_TRACE)
{
dp_trace_pcapng_merger(cur_job_id);
}
dzlog_info("del rule index %u successfully. bpf_expr is: %s", rule_index, desc[i].bpf_expr);
}
continue;
}
}
}
void telemetry_job_add_cb(const char * table_name, const char * key, const char * table_line, void ** ad, long argl,
void * argp)
{
struct dp_trace_telemetry_desc telemetry_desc = {};
struct dp_trace_job_desc * job_desc = &telemetry_desc.job_desc;
bool valid_rule = maat_rule_parse(table_line, &telemetry_desc);
if (valid_rule == false)
{
dzlog_info("not a valid rule.");
return;
}
int valid_bpf_expr = is_valid_bpf_expression(job_desc->bpf_expr);
if (valid_bpf_expr < 0)
{
dzlog_info("not a valid bpf expr: %s", job_desc->bpf_expr);
return;
}
int index = telemetry_unused_job_index_get();
if (index < 0)
{
dzlog_warn("no enough job for current rule:%s", table_line);
return;
}
job_desc->rule_index = index;
job_desc->enable = true;
memcpy(&telemetry_descs[index], &telemetry_desc, sizeof(struct dp_trace_telemetry_desc));
dzlog_info("telemetry job desc dump...");
job_desc_dump(&telemetry_descs[index].job_desc);
job_rule_apply(&telemetry_descs[index].job_desc, 1);
*ad = &telemetry_descs[index];
}
void telemetry_job_del_cb(const char * table_name, void ** ad, long argl, void * argp)
{
struct dp_trace_telemetry_desc * telemetry_desc = *ad;
struct dp_trace_job_desc * job_desc = &telemetry_desc->job_desc;
job_desc->enable = false;
dzlog_info("telemetry job desc dump...");
job_desc_dump(job_desc);
job_rule_apply(job_desc, 1);
return;
}
int is_job_id_used(job_bitmap_t job_id)
{
unsigned int index = job_id_to_index(job_id);
return dp_trace_job_occupy[index].uesd;
}
uint8_t job_id_role_get(job_bitmap_t job_id)
{
unsigned int index = job_id_to_index(job_id);
return dp_trace_job_occupy[index].role;
}
int job_id_to_index(job_bitmap_t job_id)
{
assert(__builtin_popcount(job_id) == 1);
unsigned int index = __builtin_ctz(job_id);
assert(index < DP_TRACE_JOB_NUM_MAX);
return index;
}
job_bitmap_t index_to_job_id(unsigned int index)
{
assert(index < DP_TRACE_JOB_NUM_MAX);
return 1 << index;
}
void telemetry_job_uuid_get(job_bitmap_t job_id, unsigned char * uu)
{
unsigned int index = job_id_to_index(job_id);
uuid_copy(uu, telemetry_descs[index].uuid);
}
static int telemetry_unused_job_index_get()
{
int ret = -1;
for (unsigned int i = TELEMETRY_INDEX_START; i < TELEMETRY_INDEX_END; i++)
{
job_bitmap_t job_id = index_to_job_id(i);
if (is_job_id_used(job_id))
{
continue;
}
ret = i;
break;
}
return ret;
}
void job_desc_dump(const struct dp_trace_job_desc * desc)
{
dzlog_info("rule_index:%u", desc->rule_index);
dzlog_info(" enable:%u", desc->enable);
dzlog_info(" measurement_type:%u", desc->measurement_type);
dzlog_info(" bpf_expr:%s", desc->bpf_expr);
dzlog_info(" pkt_cnt_max:%u", desc->pkt_cnt_max);
dzlog_info(" sampling:%u", desc->sampling);
dzlog_info(" snaplen:%u", desc->snaplen);
dzlog_info(" traffic_link_id_cnt:%u", desc->traffic_link_id_cnt);
char traffic_link_id_str[512];
int len = snprintf(traffic_link_id_str, sizeof(traffic_link_id_str), "%s", "[");
for (unsigned int i = 0; i < desc->traffic_link_id_cnt; i++)
{
char * normal_format = "%u,";
char * last_format = "%u";
char * fromat = normal_format;
if (i == desc->traffic_link_id_cnt - 1)
{
fromat = last_format;
}
len +=
snprintf(traffic_link_id_str + len, sizeof(traffic_link_id_str) - len, fromat, desc->traffic_link_ids[i]);
}
len += snprintf(traffic_link_id_str + len, sizeof(traffic_link_id_str) - len, "%s", "]");
dzlog_info(" traffic_link_ids:%s", traffic_link_id_str);
}
int is_valid_bpf_expression(const char * expr)
{
int ret = 0;
pcap_t * pcap_handle = NULL;
struct bpf_program fp = {};
pcap_handle = pcap_open_dead(DLT_EN10MB, 65535);
if (pcap_compile(pcap_handle, &fp, expr, 0, PCAP_NETMASK_UNKNOWN) < 0)
{
dzlog_info("pcap_compile execution failed: %s", pcap_geterr(pcap_handle));
ret = -1;
}
return ret;
}
|
