tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
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#include "testing_helpers.h"
29
30#define SOCKET_BUFFER_SIZE (getpagesize() < 8192L ? getpagesize() : 8192L)
31
32pthread_t tid;
33int rx_callbacks;
34
35static void dummyfn(void *ctx, int cpu, void *data, __u32 size)
36{
37 struct tcp_notifier *t = data;
38
39 if (t->type != 0xde || t->subtype != 0xad ||
40 t->source != 0xbe || t->hash != 0xef)
41 return;
42 rx_callbacks++;
43}
44
45void tcp_notifier_poller(struct perf_buffer *pb)
46{
47 int err;
48
49 while (1) {
50 err = perf_buffer__poll(pb, 100);
51 if (err < 0 && err != -EINTR) {
52 printf("failed perf_buffer__poll: %d\n", err);
53 return;
54 }
55 }
56}
57
58static void *poller_thread(void *arg)
59{
60 struct perf_buffer *pb = arg;
61
62 tcp_notifier_poller(pb);
63 return arg;
64}
65
66int verify_result(const struct tcpnotify_globals *result)
67{
68 return (result->ncalls > 0 && result->ncalls == rx_callbacks ? 0 : 1);
69}
70
71int main(int argc, char **argv)
72{
73 const char *file = "test_tcpnotify_kern.o";
74 struct bpf_map *perf_map, *global_map;
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_test_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 = perf_buffer__new(bpf_map__fd(perf_map), 8, dummyfn, NULL, NULL, NULL);
120 if (!pb)
121 goto err;
122
123 pthread_create(&tid, NULL, poller_thread, pb);
124
125 sprintf(test_script,
126 "iptables -A INPUT -p tcp --dport %d -j DROP",
127 TESTPORT);
128 if (system(test_script)) {
129 printf("FAILED: execute command: %s, err %d\n", test_script, -errno);
130 goto err;
131 }
132
133 sprintf(test_script,
134 "nc 127.0.0.1 %d < /etc/passwd > /dev/null 2>&1 ",
135 TESTPORT);
136 if (system(test_script))
137 printf("execute command: %s, err %d\n", test_script, -errno);
138
139 sprintf(test_script,
140 "iptables -D INPUT -p tcp --dport %d -j DROP",
141 TESTPORT);
142 if (system(test_script)) {
143 printf("FAILED: execute command: %s, err %d\n", test_script, -errno);
144 goto err;
145 }
146
147 rv = bpf_map_lookup_elem(bpf_map__fd(global_map), &key, &g);
148 if (rv != 0) {
149 printf("FAILED: bpf_map_lookup_elem returns %d\n", rv);
150 goto err;
151 }
152
153 sleep(10);
154
155 if (verify_result(&g)) {
156 printf("FAILED: Wrong stats Expected %d calls, got %d\n",
157 g.ncalls, rx_callbacks);
158 goto err;
159 }
160
161 printf("PASSED!\n");
162 error = 0;
163err:
164 bpf_prog_detach(cg_fd, BPF_CGROUP_SOCK_OPS);
165 close(cg_fd);
166 cleanup_cgroup_environment();
167 perf_buffer__free(pb);
168 return error;
169}