27 	int err;  in cleanup()  local
37 		err = bpf_tc_hook_destroy(&hook);  in cleanup()
38 		if (err < 0) {  in cleanup()
39 			fprintf(stderr, "Error: bpf_tc_hook_destroy: %s\n", strerror(-err));  in cleanup()
49 		err = bpf_xdp_attach(ifindex, -1, 0, NULL);  in cleanup()
50 		if (err < 0) {  in cleanup()
51 			fprintf(stderr, "Error: bpf_set_link_xdp_fd: %s\n", strerror(-err));  in cleanup()
57 		err = bpf_xdp_attach(ifindex, -1, XDP_FLAGS_REPLACE, &opts);  in cleanup()
59 		if (err < 0) {  in cleanup()
60 			fprintf(stderr, "Error: bpf_set_link_xdp_fd_opts: %s\n", strerror(-err));  in cleanup()
62 			if (err != -EEXIST) {  in cleanup()
196 	int err;  in syncookie_attach()  local
200 	err = libbpf_get_error(obj);  in syncookie_attach()
201 	if (err < 0) {  in syncookie_attach()
202 		fprintf(stderr, "Error: bpf_object__open_file: %s\n", strerror(-err));  in syncookie_attach()
203 		return err;  in syncookie_attach()
206 	err = bpf_object__load(obj);  in syncookie_attach()
207 	if (err < 0) {  in syncookie_attach()
208 		fprintf(stderr, "Error: bpf_object__open_file: %s\n", strerror(-err));  in syncookie_attach()
209 		return err;  in syncookie_attach()
220 	err = bpf_prog_get_info_by_fd(prog_fd, &info, &info_len);  in syncookie_attach()
221 	if (err < 0) {  in syncookie_attach()
223 			strerror(-err));  in syncookie_attach()
239 		err = bpf_tc_hook_create(&hook);  in syncookie_attach()
240 		if (err < 0) {  in syncookie_attach()
242 				strerror(-err));  in syncookie_attach()
245 		err = bpf_tc_attach(&hook, &opts);  in syncookie_attach()
246 		if (err < 0) {  in syncookie_attach()
248 				strerror(-err));  in syncookie_attach()
253 		err = bpf_xdp_attach(ifindex, prog_fd,  in syncookie_attach()
255 		if (err < 0) {  in syncookie_attach()
257 				strerror(-err));  in syncookie_attach()
261 	err = 0;  in syncookie_attach()
264 	return err;  in syncookie_attach()
278 	int err;  in syncookie_open_bpf_maps()  local
296 	err = bpf_prog_get_info_by_fd(prog_fd, &prog_info, &info_len);  in syncookie_open_bpf_maps()
297 	if (err != 0) {  in syncookie_open_bpf_maps()
299 			strerror(-err));  in syncookie_open_bpf_maps()
306 		err = -ENOENT;  in syncookie_open_bpf_maps()
314 		err = bpf_map_get_fd_by_id(map_ids[i]);  in syncookie_open_bpf_maps()
315 		if (err < 0) {  in syncookie_open_bpf_maps()
316 			fprintf(stderr, "Error: bpf_map_get_fd_by_id: %s\n", strerror(-err));  in syncookie_open_bpf_maps()
319 		map_fd = err;  in syncookie_open_bpf_maps()
322 		err = bpf_map_get_info_by_fd(map_fd, &map_info, &info_len);  in syncookie_open_bpf_maps()
323 		if (err != 0) {  in syncookie_open_bpf_maps()
325 				strerror(-err));  in syncookie_open_bpf_maps()
341 		err = 0;  in syncookie_open_bpf_maps()
345 	err = -ENOENT;  in syncookie_open_bpf_maps()
357 	return err;  in syncookie_open_bpf_maps()
369 	int err = 0;  in main()  local
377 			err = bpf_xdp_query_id(ifindex, 0, &prog_id);  in main()
378 			if (err < 0) {  in main()
380 					strerror(-err));  in main()
385 			err = syncookie_attach(argv[0], ifindex, tc);  in main()
386 			if (err < 0)  in main()
392 	err = syncookie_open_bpf_maps(prog_id, &values_map_fd, &ports_map_fd);  in main()
393 	if (err < 0)  in main()
408 			err = bpf_map_update_elem(ports_map_fd, &port_idx, &port, BPF_ANY);  in main()
409 			if (err != 0) {  in main()
410 				fprintf(stderr, "Error: bpf_map_update_elem: %s\n", strerror(-err));  in main()
418 		err = bpf_map_update_elem(ports_map_fd, &port_idx, &port_last, BPF_ANY);  in main()
419 		if (err != 0) {  in main()
420 			fprintf(stderr, "Error: bpf_map_update_elem: %s\n", strerror(-err));  in main()
432 		err = bpf_map_update_elem(values_map_fd, &key, &tcpipopts, BPF_ANY);  in main()
433 		if (err != 0) {  in main()
434 			fprintf(stderr, "Error: bpf_map_update_elem: %s\n", strerror(-err));  in main()
448 		err = bpf_map_lookup_elem(values_map_fd, &key, &value);  in main()
449 		if (err != 0) {  in main()
450 			fprintf(stderr, "Error: bpf_map_lookup_elem: %s\n", strerror(-err));  in main()
470 	return err == 0 ? 0 : 1;  in main()