new file mode 100644
@@ -0,0 +1 @@
+netdev
new file mode 100644
@@ -0,0 +1,28 @@
+# SPDX-License-Identifier: GPL-2.0
+
+CC=gcc
+CFLAGS=-std=gnu11 -O2 -W -Wall -Wextra -Wno-unused-parameter -Wshadow \
+ -I../lib/ -I../generated/
+ifeq ("$(DEBUG)","1")
+ CFLAGS += -g -fsanitize=address -fsanitize=leak -static-libasan
+endif
+
+LDLIBS=-lmnl ../lib/ynl.a ../generated/protos.a
+
+SRCS=$(wildcard *.c)
+BINS=$(patsubst %.c,%,${SRCS})
+
+include $(wildcard *.d)
+
+all: $(BINS)
+
+$(BINS): ../lib/ynl.a ../generated/protos.a
+
+clean:
+ rm -f *.o *.d *~
+
+hardclean: clean
+ rm -f $(BINS)
+
+.PHONY: all clean
+.DEFAULT_GOAL=all
new file mode 100644
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <stdio.h>
+#include <string.h>
+
+#include <ynl.h>
+
+#include <net/if.h>
+
+#include "netdev-user.h"
+
+/* netdev genetlink family code sample
+ * This sample shows off basics of the netdev family but also notification
+ * handling, hence the somewhat odd UI. We subscribe to notifications first
+ * then wait for ifc selection, so the socket may already accumulate
+ * notifications as we wait. This allows us to test that YNL can handle
+ * requests and notifications getting interleaved.
+ */
+
+static void netdev_print_device(struct netdev_dev_get_rsp *d, unsigned int op)
+{
+ char ifname[IF_NAMESIZE];
+ const char *name;
+
+ if (!d->_present.ifindex)
+ return;
+
+ name = if_indextoname(d->ifindex, ifname);
+ if (name)
+ printf("%8s", name);
+ printf("[%d]\t", d->ifindex);
+
+ if (!d->_present.xdp_features)
+ return;
+
+ printf("%llx:", d->xdp_features);
+ for (int i = 0; d->xdp_features > 1U << i; i++) {
+ if (d->xdp_features & (1U << i))
+ printf(" %s", netdev_xdp_act_str(1 << i));
+ }
+
+ name = netdev_op_str(op);
+ if (name)
+ printf(" (ntf: %s)", name);
+ printf("\n");
+}
+
+int main(int argc, char **argv)
+{
+ struct netdev_dev_get_list *devs;
+ struct ynl_ntf_base_type *ntf;
+ struct ynl_error yerr;
+ struct ynl_sock *ys;
+ int ifindex = 0;
+
+ if (argc > 1)
+ ifindex = strtol(argv[1], NULL, 0);
+
+ ys = ynl_sock_create(&ynl_netdev_family, &yerr);
+ if (!ys) {
+ fprintf(stderr, "YNL: %s\n", yerr.msg);
+ return 1;
+ }
+
+ if (ynl_subscribe(ys, "mgmt"))
+ goto err_close;
+
+ printf("Select ifc ($ifindex; or 0 = dump; or -2 ntf check): ");
+ scanf("%d", &ifindex);
+
+ 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;
+
+ 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);
+ ynl_sock_destroy(ys);
+ return 2;
+}
Add a sample application using the C library. My main goal is to make writing selftests easier but until I have some of those ready I think it's useful to show off the functionality and let people poke and tinker. Sample outputs - dump: $ ./netdev Select ifc ($ifindex; or 0 = dump; or -2 ntf check): 0 lo[1] 0: enp1s0[2] 23: basic redirect rx-sg Notifications (watching veth pair getting added and deleted): $ ./netdev Select ifc ($ifindex; or 0 = dump; or -2 ntf check): -2 [53] 0: (ntf: dev-add-ntf) [54] 0: (ntf: dev-add-ntf) [54] 23: basic redirect rx-sg (ntf: dev-change-ntf) [53] 23: basic redirect rx-sg (ntf: dev-change-ntf) [53] 23: basic redirect rx-sg (ntf: dev-del-ntf) [54] 23: basic redirect rx-sg (ntf: dev-del-ntf) Signed-off-by: Jakub Kicinski <kuba@kernel.org> --- tools/net/ynl/samples/.gitignore | 1 + tools/net/ynl/samples/Makefile | 28 ++++++++ tools/net/ynl/samples/netdev.c | 108 +++++++++++++++++++++++++++++++ 3 files changed, 137 insertions(+) create mode 100644 tools/net/ynl/samples/.gitignore create mode 100644 tools/net/ynl/samples/Makefile create mode 100644 tools/net/ynl/samples/netdev.c