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_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 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.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; 162 err: 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