// SPDX-License-Identifier: GPL-2.0#include <stdio.h>#include <string.h> #include <ynl.h> #include <net/if.h> #include "netdev-user.h" /* netdev genetlink family code sample * This sample shows off basics of the netdev family but also notification * handling, hence the somewhat odd UI. We subscribe to notifications first * then wait for ifc selection, so the socket may already accumulate * notifications as we wait. This allows us to test that YNL can handle * requests and notifications getting interleaved. */ static void netdev_print_device(struct netdev_dev_get_rsp *d, unsigned int op){	char ifname[IF_NAMESIZE];	const char *name; 	if (!d->_present.ifindex)		return; 	name = if_indextoname(d->ifindex, ifname);	if (name)		printf("%8s", name);	printf("[%d]\t", d->ifindex); 	if (!d->_present.xdp_features)		return; 	printf("xdp-features (%llx):", d->xdp_features);	for (int i = 0; d->xdp_features >= 1U << i; i++) {		if (d->xdp_features & (1U << i))			printf(" %s", netdev_xdp_act_str(1 << i));	} 	printf(" xdp-rx-metadata-features (%llx):", d->xdp_rx_metadata_features);	for (int i = 0; d->xdp_rx_metadata_features >= 1U << i; i++) {		if (d->xdp_rx_metadata_features & (1U << i))			printf(" %s", netdev_xdp_rx_metadata_str(1 << i));	} 	printf(" xsk-features (%llx):", d->xsk_features);	for (int i = 0; d->xsk_features >= 1U << i; i++) {		if (d->xsk_features & (1U << i))			printf(" %s", netdev_xsk_flags_str(1 << i));	} 	printf(" xdp-zc-max-segs=%u", d->xdp_zc_max_segs); 	name = netdev_op_str(op);	if (name)		printf(" (ntf: %s)", name);	printf("\n");} int main(int argc, char **argv){	struct netdev_dev_get_list *devs;	struct ynl_ntf_base_type *ntf;	struct ynl_error yerr;	struct ynl_sock *ys;	int ifindex = 0; 	if (argc > 1)		ifindex = strtol(argv[1], NULL, 0); 	ys = ynl_sock_create(&ynl_netdev_family, &yerr);	if (!ys) {		fprintf(stderr, "YNL: %s\n", yerr.msg);		return 1;	} 	if (ynl_subscribe(ys, "mgmt"))		goto err_close; 	printf("Select ifc ($ifindex; or 0 = dump; or -2 ntf check): ");	if (scanf("%d", &ifindex) != 1) {		fprintf(stderr, "Error: unable to parse input\n");		goto err_destroy;	} 	if (ifindex > 0) {		struct netdev_dev_get_req *req;		struct netdev_dev_get_rsp *d; 		req = netdev_dev_get_req_alloc();		netdev_dev_get_req_set_ifindex(req, ifindex); 		d = netdev_dev_get(ys, req);		netdev_dev_get_req_free(req);		if (!d)			goto err_close; 		netdev_print_device(d, 0);		netdev_dev_get_rsp_free(d);	} else if (!ifindex) {		devs = netdev_dev_get_dump(ys);		if (!devs)			goto err_close; 		if (ynl_dump_empty(devs))			fprintf(stderr, "Error: no devices reported\n");		ynl_dump_foreach(devs, d)			netdev_print_device(d, 0);		netdev_dev_get_list_free(devs);	} else if (ifindex == -2) {		ynl_ntf_check(ys);	}	while ((ntf = ynl_ntf_dequeue(ys))) {		netdev_print_device((struct netdev_dev_get_rsp *)&ntf->data,				    ntf->cmd);		ynl_ntf_free(ntf);	} 	ynl_sock_destroy(ys);	return 0; err_close:	fprintf(stderr, "YNL: %s\n", ys->err.msg);err_destroy:	ynl_sock_destroy(ys);	return 2;}