1
2#define _GNU_SOURCE
3#include <pthread.h>
4#include <inttypes.h>
5#include <stdio.h>
6#include <stdlib.h>
7#include <unistd.h>
8#include <asm/types.h>
9#include <sys/syscall.h>
10#include <errno.h>
11#include <string.h>
12#include <linux/bpf.h>
13#include <sys/socket.h>
14#include <bpf/bpf.h>
15#include <bpf/libbpf.h>
16#include <sys/ioctl.h>
17#include <linux/rtnetlink.h>
18#include <signal.h>
19#include <linux/perf_event.h>
20#include <linux/err.h>
21
22#include "bpf_rlimit.h"
23#include "bpf_util.h"
24#include "cgroup_helpers.h"
25
26#include "test_tcpnotify.h"
27#include "trace_helpers.h"
28
29#define SOCKET_BUFFER_SIZE (getpagesize() < 8192L ? getpagesize() : 8192L)
30
31pthread_t tid;
32int rx_callbacks;
33
34static void dummyfn(void *ctx, int cpu, void *data, __u32 size)
35{
36 struct tcp_notifier *t = data;
37
38 if (t->type != 0xde || t->subtype != 0xad ||
39 t->source != 0xbe || t->hash != 0xef)
40 return;
41 rx_callbacks++;
42}
43
44void tcp_notifier_poller(struct perf_buffer *pb)
45{
46 int err;
47
48 while (1) {
49 err = perf_buffer__poll(pb, 100);
50 if (err < 0 && err != -EINTR) {
51 printf("failed perf_buffer__poll: %d\n", err);
52 return;
53 }
54 }
55}
56
57static void *poller_thread(void *arg)
58{
59 struct perf_buffer *pb = arg;
60
61 tcp_notifier_poller(pb);
62 return arg;
63}
64
65int verify_result(const struct tcpnotify_globals *result)
66{
67 return (result->ncalls > 0 && result->ncalls == rx_callbacks ? 0 : 1);
68}
69
70int main(int argc, char **argv)
71{
72 const char *file = "test_tcpnotify_kern.o";
73 struct bpf_map *perf_map, *global_map;
74 struct perf_buffer_opts pb_opts = {};
75 struct tcpnotify_globals g = {0};
76 struct perf_buffer *pb = NULL;
77 const char *cg_path = "/foo";
78 int prog_fd, rv, cg_fd = -1;
79 int error = EXIT_FAILURE;
80 struct bpf_object *obj;
81 char test_script[80];
82 cpu_set_t cpuset;
83 __u32 key = 0;
84
85 libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
86
87 CPU_ZERO(&cpuset);
88 CPU_SET(0, &cpuset);
89 pthread_setaffinity_np(pthread_self(), sizeof(cpu_set_t), &cpuset);
90
91 cg_fd = cgroup_setup_and_join(cg_path);
92 if (cg_fd < 0)
93 goto err;
94
95 if (bpf_prog_load(file, BPF_PROG_TYPE_SOCK_OPS, &obj, &prog_fd)) {
96 printf("FAILED: load_bpf_file failed for: %s\n", file);
97 goto err;
98 }
99
100 rv = bpf_prog_attach(prog_fd, cg_fd, BPF_CGROUP_SOCK_OPS, 0);
101 if (rv) {
102 printf("FAILED: bpf_prog_attach: %d (%s)\n",
103 error, strerror(errno));
104 goto err;
105 }
106
107 perf_map = bpf_object__find_map_by_name(obj, "perf_event_map");
108 if (!perf_map) {
109 printf("FAIL:map '%s' not found\n", "perf_event_map");
110 goto err;
111 }
112
113 global_map = bpf_object__find_map_by_name(obj, "global_map");
114 if (!global_map) {
115 printf("FAIL:map '%s' not found\n", "global_map");
116 return -1;
117 }
118
119 pb_opts.sample_cb = dummyfn;
120 pb = perf_buffer__new(bpf_map__fd(perf_map), 8, &pb_opts);
121 if (!pb)
122 goto err;
123
124 pthread_create(&tid, NULL, poller_thread, pb);
125
126 sprintf(test_script,
127 "iptables -A INPUT -p tcp --dport %d -j DROP",
128 TESTPORT);
129 if (system(test_script)) {
130 printf("FAILED: execute command: %s, err %d\n", test_script, -errno);
131 goto err;
132 }
133
134 sprintf(test_script,
135 "nc 127.0.0.1 %d < /etc/passwd > /dev/null 2>&1 ",
136 TESTPORT);
137 if (system(test_script))
138 printf("execute command: %s, err %d\n", test_script, -errno);
139
140 sprintf(test_script,
141 "iptables -D INPUT -p tcp --dport %d -j DROP",
142 TESTPORT);
143 if (system(test_script)) {
144 printf("FAILED: execute command: %s, err %d\n", test_script, -errno);
145 goto err;
146 }
147
148 rv = bpf_map_lookup_elem(bpf_map__fd(global_map), &key, &g);
149 if (rv != 0) {
150 printf("FAILED: bpf_map_lookup_elem returns %d\n", rv);
151 goto err;
152 }
153
154 sleep(10);
155
156 if (verify_result(&g)) {
157 printf("FAILED: Wrong stats Expected %d calls, got %d\n",
158 g.ncalls, rx_callbacks);
159 goto err;
160 }
161
162 printf("PASSED!\n");
163 error = 0;
164err:
165 bpf_prog_detach(cg_fd, BPF_CGROUP_SOCK_OPS);
166 close(cg_fd);
167 cleanup_cgroup_environment();
168 perf_buffer__free(pb);
169 return error;
170}
171
