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
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 CPU_ZERO(&cpuset);
86 CPU_SET(0, &cpuset);
87 pthread_setaffinity_np(pthread_self(), sizeof(cpu_set_t), &cpuset);
88
89 if (setup_cgroup_environment())
90 goto err;
91
92 cg_fd = create_and_get_cgroup(cg_path);
93 if (cg_fd < 0)
94 goto err;
95
96 if (join_cgroup(cg_path))
97 goto err;
98
99 if (bpf_prog_load(file, BPF_PROG_TYPE_SOCK_OPS, &obj, &prog_fd)) {
100 printf("FAILED: load_bpf_file failed for: %s\n", file);
101 goto err;
102 }
103
104 rv = bpf_prog_attach(prog_fd, cg_fd, BPF_CGROUP_SOCK_OPS, 0);
105 if (rv) {
106 printf("FAILED: bpf_prog_attach: %d (%s)\n",
107 error, strerror(errno));
108 goto err;
109 }
110
111 perf_map = bpf_object__find_map_by_name(obj, "perf_event_map");
112 if (!perf_map) {
113 printf("FAIL:map '%s' not found\n", "perf_event_map");
114 goto err;
115 }
116
117 global_map = bpf_object__find_map_by_name(obj, "global_map");
118 if (!global_map) {
119 printf("FAIL:map '%s' not found\n", "global_map");
120 return -1;
121 }
122
123 pb_opts.sample_cb = dummyfn;
124 pb = perf_buffer__new(bpf_map__fd(perf_map), 8, &pb_opts);
125 if (IS_ERR(pb))
126 goto err;
127
128 pthread_create(&tid, NULL, poller_thread, pb);
129
130 sprintf(test_script,
131 "iptables -A INPUT -p tcp --dport %d -j DROP",
132 TESTPORT);
133 system(test_script);
134
135 sprintf(test_script,
136 "nc 127.0.0.1 %d < /etc/passwd > /dev/null 2>&1 ",
137 TESTPORT);
138 system(test_script);
139
140 sprintf(test_script,
141 "iptables -D INPUT -p tcp --dport %d -j DROP",
142 TESTPORT);
143 system(test_script);
144
145 rv = bpf_map_lookup_elem(bpf_map__fd(global_map), &key, &g);
146 if (rv != 0) {
147 printf("FAILED: bpf_map_lookup_elem returns %d\n", rv);
148 goto err;
149 }
150
151 sleep(10);
152
153 if (verify_result(&g)) {
154 printf("FAILED: Wrong stats Expected %d calls, got %d\n",
155 g.ncalls, rx_callbacks);
156 goto err;
157 }
158
159 printf("PASSED!\n");
160 error = 0;
161err:
162 bpf_prog_detach(cg_fd, BPF_CGROUP_SOCK_OPS);
163 close(cg_fd);
164 cleanup_cgroup_environment();
165 if (!IS_ERR_OR_NULL(pb))
166 perf_buffer__free(pb);
167 return error;
168}