169 lines · c
1// SPDX-License-Identifier: GPL-2.02#define _GNU_SOURCE3#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_util.h"23#include "cgroup_helpers.h"24 25#include "test_tcpnotify.h"26#include "trace_helpers.h"27#include "testing_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.bpf.o";73 struct bpf_map *perf_map, *global_map;74 struct tcpnotify_globals g = {0};75 struct perf_buffer *pb = NULL;76 const char *cg_path = "/foo";77 int prog_fd, rv, cg_fd = -1;78 int error = EXIT_FAILURE;79 struct bpf_object *obj;80 char test_script[80];81 cpu_set_t cpuset;82 __u32 key = 0;83 84 libbpf_set_strict_mode(LIBBPF_STRICT_ALL);85 86 CPU_ZERO(&cpuset);87 CPU_SET(0, &cpuset);88 pthread_setaffinity_np(pthread_self(), sizeof(cpu_set_t), &cpuset);89 90 cg_fd = cgroup_setup_and_join(cg_path);91 if (cg_fd < 0)92 goto err;93 94 if (bpf_prog_test_load(file, BPF_PROG_TYPE_SOCK_OPS, &obj, &prog_fd)) {95 printf("FAILED: load_bpf_file failed for: %s\n", file);96 goto err;97 }98 99 rv = bpf_prog_attach(prog_fd, cg_fd, BPF_CGROUP_SOCK_OPS, 0);100 if (rv) {101 printf("FAILED: bpf_prog_attach: %d (%s)\n",102 error, strerror(errno));103 goto err;104 }105 106 perf_map = bpf_object__find_map_by_name(obj, "perf_event_map");107 if (!perf_map) {108 printf("FAIL:map '%s' not found\n", "perf_event_map");109 goto err;110 }111 112 global_map = bpf_object__find_map_by_name(obj, "global_map");113 if (!global_map) {114 printf("FAIL:map '%s' not found\n", "global_map");115 return -1;116 }117 118 pb = perf_buffer__new(bpf_map__fd(perf_map), 8, dummyfn, NULL, NULL, NULL);119 if (!pb)120 goto err;121 122 pthread_create(&tid, NULL, poller_thread, pb);123 124 sprintf(test_script,125 "iptables -A INPUT -p tcp --dport %d -j DROP",126 TESTPORT);127 if (system(test_script)) {128 printf("FAILED: execute command: %s, err %d\n", test_script, -errno);129 goto err;130 }131 132 sprintf(test_script,133 "nc 127.0.0.1 %d < /etc/passwd > /dev/null 2>&1 ",134 TESTPORT);135 if (system(test_script))136 printf("execute command: %s, err %d\n", test_script, -errno);137 138 sprintf(test_script,139 "iptables -D INPUT -p tcp --dport %d -j DROP",140 TESTPORT);141 if (system(test_script)) {142 printf("FAILED: execute command: %s, err %d\n", test_script, -errno);143 goto err;144 }145 146 rv = bpf_map_lookup_elem(bpf_map__fd(global_map), &key, &g);147 if (rv != 0) {148 printf("FAILED: bpf_map_lookup_elem returns %d\n", rv);149 goto err;150 }151 152 sleep(10);153 154 if (verify_result(&g)) {155 printf("FAILED: Wrong stats Expected %d calls, got %d\n",156 g.ncalls, rx_callbacks);157 goto err;158 }159 160 printf("PASSED!\n");161 error = 0;162err:163 bpf_prog_detach(cg_fd, BPF_CGROUP_SOCK_OPS);164 close(cg_fd);165 cleanup_cgroup_environment();166 perf_buffer__free(pb);167 return error;168}169