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ee0202e2e7
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)
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
109 lines
2.4 KiB
C
109 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <stdio.h>
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#include <string.h>
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#include <ynl.h>
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#include <net/if.h>
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#include "netdev-user.h"
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/* netdev genetlink family code sample
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* This sample shows off basics of the netdev family but also notification
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* handling, hence the somewhat odd UI. We subscribe to notifications first
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* then wait for ifc selection, so the socket may already accumulate
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* notifications as we wait. This allows us to test that YNL can handle
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* requests and notifications getting interleaved.
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*/
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static void netdev_print_device(struct netdev_dev_get_rsp *d, unsigned int op)
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{
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char ifname[IF_NAMESIZE];
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const char *name;
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if (!d->_present.ifindex)
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return;
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name = if_indextoname(d->ifindex, ifname);
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if (name)
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printf("%8s", name);
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printf("[%d]\t", d->ifindex);
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if (!d->_present.xdp_features)
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return;
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printf("%llx:", d->xdp_features);
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for (int i = 0; d->xdp_features > 1U << i; i++) {
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if (d->xdp_features & (1U << i))
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printf(" %s", netdev_xdp_act_str(1 << i));
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}
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name = netdev_op_str(op);
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if (name)
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printf(" (ntf: %s)", name);
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printf("\n");
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}
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int main(int argc, char **argv)
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{
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struct netdev_dev_get_list *devs;
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struct ynl_ntf_base_type *ntf;
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struct ynl_error yerr;
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struct ynl_sock *ys;
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int ifindex = 0;
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if (argc > 1)
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ifindex = strtol(argv[1], NULL, 0);
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ys = ynl_sock_create(&ynl_netdev_family, &yerr);
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if (!ys) {
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fprintf(stderr, "YNL: %s\n", yerr.msg);
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return 1;
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}
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if (ynl_subscribe(ys, "mgmt"))
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goto err_close;
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printf("Select ifc ($ifindex; or 0 = dump; or -2 ntf check): ");
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scanf("%d", &ifindex);
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if (ifindex > 0) {
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struct netdev_dev_get_req *req;
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struct netdev_dev_get_rsp *d;
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req = netdev_dev_get_req_alloc();
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netdev_dev_get_req_set_ifindex(req, ifindex);
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d = netdev_dev_get(ys, req);
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netdev_dev_get_req_free(req);
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if (!d)
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goto err_close;
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netdev_print_device(d, 0);
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netdev_dev_get_rsp_free(d);
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} else if (!ifindex) {
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devs = netdev_dev_get_dump(ys);
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if (!devs)
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goto err_close;
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ynl_dump_foreach(devs, d)
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netdev_print_device(d, 0);
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netdev_dev_get_list_free(devs);
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} else if (ifindex == -2) {
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ynl_ntf_check(ys);
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}
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while ((ntf = ynl_ntf_dequeue(ys))) {
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netdev_print_device((struct netdev_dev_get_rsp *)&ntf->data,
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ntf->cmd);
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ynl_ntf_free(ntf);
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}
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ynl_sock_destroy(ys);
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return 0;
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err_close:
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fprintf(stderr, "YNL: %s\n", ys->err.msg);
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ynl_sock_destroy(ys);
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return 2;
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}
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