39 			fprintf(stderr, "Error: bpf_tc_hook_destroy: %s\n", strerror(-err));  in cleanup()
40 			fprintf(stderr, "Failed to destroy the TC hook\n");  in cleanup()
48 		fprintf(stderr, "Error: bpf_prog_get_fd_by_id: %s\n", strerror(-prog_fd));  in cleanup()
51 			fprintf(stderr, "Error: bpf_set_link_xdp_fd: %s\n", strerror(-err));  in cleanup()
52 			fprintf(stderr, "Failed to detach XDP program\n");  in cleanup()
60 			fprintf(stderr, "Error: bpf_set_link_xdp_fd_opts: %s\n", strerror(-err));  in cleanup()
63 				fprintf(stderr, "Failed to detach XDP program\n");  in cleanup()
73 …fprintf(stderr, "Usage: %s [--iface <iface>|--prog <prog_id>] [--mss4 <mss ipv4> --mss6 <mss ipv6>…  in usage()
202 		fprintf(stderr, "Error: bpf_object__open_file: %s\n", strerror(-err));  in syncookie_attach()
208 		fprintf(stderr, "Error: bpf_object__open_file: %s\n", strerror(-err));  in syncookie_attach()
214 		fprintf(stderr, "Error: bpf_object__find_program_by_name: program was not found\n");  in syncookie_attach()
222 		fprintf(stderr, "Error: bpf_prog_get_info_by_fd: %s\n",  in syncookie_attach()
241 			fprintf(stderr, "Error: bpf_tc_hook_create: %s\n",  in syncookie_attach()
247 			fprintf(stderr, "Error: bpf_tc_attach: %s\n",  in syncookie_attach()
256 			fprintf(stderr, "Error: bpf_set_link_xdp_fd: %s\n",  in syncookie_attach()
286 		fprintf(stderr, "Error: bpf_prog_get_fd_by_id: %s\n", strerror(-prog_fd));  in syncookie_open_bpf_maps()
298 		fprintf(stderr, "Error: bpf_prog_get_info_by_fd: %s\n",  in syncookie_open_bpf_maps()
304 		fprintf(stderr, "Error: Found %u BPF maps, expected at least 2\n",  in syncookie_open_bpf_maps()
316 			fprintf(stderr, "Error: bpf_map_get_fd_by_id: %s\n", strerror(-err));  in syncookie_open_bpf_maps()
324 			fprintf(stderr, "Error: bpf_map_get_info_by_fd: %s\n",  in syncookie_open_bpf_maps()
379 				fprintf(stderr, "Error: bpf_get_link_xdp_id: %s\n",  in main()
401 		fprintf(stderr, "Replacing allowed ports\n");  in main()
410 				fprintf(stderr, "Error: bpf_map_update_elem: %s\n", strerror(-err));  in main()
411 				fprintf(stderr, "Failed to add port %u (index %u)\n",  in main()
415 			fprintf(stderr, "Added port %u\n", port);  in main()
420 			fprintf(stderr, "Error: bpf_map_update_elem: %s\n", strerror(-err));  in main()
421 			fprintf(stderr, "Failed to add the terminator value 0 (index %u)\n",  in main()
430 		fprintf(stderr, "Replacing TCP/IP options\n");  in main()
434 			fprintf(stderr, "Error: bpf_map_update_elem: %s\n", strerror(-err));  in main()
450 			fprintf(stderr, "Error: bpf_map_lookup_elem: %s\n", strerror(-err));  in main()