samples/bpf/xdp_router_ipv4_user.c

64 	int len, nll = 0;
69 		len = recv(sock, buf_ptr, sizeof(buf) - nll, 0);
78 		nll += len;
85 	return nll;
91 static void read_route(struct nlmsghdr *nh, int nll)
117 	for (; NLMSG_OK(nh, nll); nh = NLMSG_NEXT(nh, nll)) {
259 	int nll;
300 	nll = recv_msg(sa, sock);
301 	if (nll < 0) {
302 		fprintf(stderr, "recv from netlink: %s\n", strerror(nll));
303 		ret = nll;
307 	read_route(nh, nll);
316 static void read_arp(struct nlmsghdr *nh, int nll)
333 	for (; NLMSG_OK(nh, nll); nh = NLMSG_NEXT(nh, nll)) {
396 	int nll;
435 	nll = recv_msg(sa, sock);
436 	if (nll < 0) {
437 		fprintf(stderr, "recv from netlink: %s\n", strerror(nll));
438 		ret = nll;
442 	read_arp(nh, nll);
455 	int sock, sock_arp, nll;
510 			nll = recv_msg(lr, sock);
511 			if (nll < 0) {
513 					strerror(nll));
518 			read_route(nh, nll);
523 			nll = recv_msg(la, sock_arp);
524 			if (nll < 0) {
526 					strerror(nll));
531 			read_arp(nh, nll);