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 32 pthread_t tid; 33 int rx_callbacks; 34 35 static 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 45 void 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 58 static void *poller_thread(void *arg) 59 { 60 struct perf_buffer *pb = arg; 61 62 tcp_notifier_poller(pb); 63 return arg; 64 } 65 66 int verify_result(const struct tcpnotify_globals *result) 67 { 68 return (result->ncalls > 0 && result->ncalls == rx_callbacks ? 0 : 1); 69 } 70 71 int 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; 163 err: 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 } 170