tools/testing/selftests/bpf/test_tcpnotify_user.c

   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
  31 pthread_t tid;
  32 int rx_callbacks;
  33
  34 static 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
  44 void 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
  57 static void *poller_thread(void *arg)
  58 {
  59         struct perf_buffer *pb = arg;
  60
  61         tcp_notifier_poller(pb);
  62         return arg;
  63 }
  64
  65 int verify_result(const struct tcpnotify_globals *result)
  66 {
  67         return (result->ncalls > 0 && result->ncalls == rx_callbacks ? 0 : 1);
  68 }
  69
  70 int 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;
 161 err:
 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 }