1 // SPDX-License-Identifier: GPL-2.0 2 #include <test_progs.h> 3 4 void test_probe_user(void) 5 { 6 #define kprobe_name "__sys_connect" 7 const char *prog_name = "kprobe/" kprobe_name; 8 const char *obj_file = "./test_probe_user.o"; 9 DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts, ); 10 int err, results_map_fd, sock_fd, duration = 0; 11 struct sockaddr curr, orig, tmp; 12 struct sockaddr_in *in = (struct sockaddr_in *)&curr; 13 struct bpf_link *kprobe_link = NULL; 14 struct bpf_program *kprobe_prog; 15 struct bpf_object *obj; 16 static const int zero = 0; 17 18 obj = bpf_object__open_file(obj_file, &opts); 19 if (CHECK(IS_ERR(obj), "obj_open_file", "err %ld\n", PTR_ERR(obj))) 20 return; 21 22 kprobe_prog = bpf_object__find_program_by_title(obj, prog_name); 23 if (CHECK(!kprobe_prog, "find_probe", 24 "prog '%s' not found\n", prog_name)) 25 goto cleanup; 26 27 err = bpf_object__load(obj); 28 if (CHECK(err, "obj_load", "err %d\n", err)) 29 goto cleanup; 30 31 results_map_fd = bpf_find_map(__func__, obj, "test_pro.bss"); 32 if (CHECK(results_map_fd < 0, "find_bss_map", 33 "err %d\n", results_map_fd)) 34 goto cleanup; 35 36 kprobe_link = bpf_program__attach_kprobe(kprobe_prog, false, 37 kprobe_name); 38 if (CHECK(IS_ERR(kprobe_link), "attach_kprobe", 39 "err %ld\n", PTR_ERR(kprobe_link))) { 40 kprobe_link = NULL; 41 goto cleanup; 42 } 43 44 memset(&curr, 0, sizeof(curr)); 45 in->sin_family = AF_INET; 46 in->sin_port = htons(5555); 47 in->sin_addr.s_addr = inet_addr("255.255.255.255"); 48 memcpy(&orig, &curr, sizeof(curr)); 49 50 sock_fd = socket(AF_INET, SOCK_STREAM, 0); 51 if (CHECK(sock_fd < 0, "create_sock_fd", "err %d\n", sock_fd)) 52 goto cleanup; 53 54 connect(sock_fd, &curr, sizeof(curr)); 55 close(sock_fd); 56 57 err = bpf_map_lookup_elem(results_map_fd, &zero, &tmp); 58 if (CHECK(err, "get_kprobe_res", 59 "failed to get kprobe res: %d\n", err)) 60 goto cleanup; 61 62 in = (struct sockaddr_in *)&tmp; 63 if (CHECK(memcmp(&tmp, &orig, sizeof(orig)), "check_kprobe_res", 64 "wrong kprobe res from probe read: %s:%u\n", 65 inet_ntoa(in->sin_addr), ntohs(in->sin_port))) 66 goto cleanup; 67 68 memset(&tmp, 0xab, sizeof(tmp)); 69 70 in = (struct sockaddr_in *)&curr; 71 if (CHECK(memcmp(&curr, &tmp, sizeof(tmp)), "check_kprobe_res", 72 "wrong kprobe res from probe write: %s:%u\n", 73 inet_ntoa(in->sin_addr), ntohs(in->sin_port))) 74 goto cleanup; 75 cleanup: 76 bpf_link__destroy(kprobe_link); 77 bpf_object__close(obj); 78 } 79