1// SPDX-License-Identifier: GPL-2.0
 2#include <net/if.h>
 3#include <test_progs.h>
 4#include <network_helpers.h>
 5
 6#define LOCAL_NETNS "xdp_dev_bound_only_netns"
 7
 8static int load_dummy_prog(char *name, __u32 ifindex, __u32 flags)
 9{
10	struct bpf_insn insns[] = { BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN() };
11	LIBBPF_OPTS(bpf_prog_load_opts, opts);
12
13	opts.prog_flags = flags;
14	opts.prog_ifindex = ifindex;
15	return bpf_prog_load(BPF_PROG_TYPE_XDP, name, "GPL", insns, ARRAY_SIZE(insns), &opts);
16}
17
18/* A test case for bpf_offload_netdev->offload handling bug:
19 * - create a veth device (does not support offload);
20 * - create a device bound XDP program with BPF_F_XDP_DEV_BOUND_ONLY flag
21 *   (such programs are not offloaded);
22 * - create a device bound XDP program without flags (such programs are offloaded).
23 * This might lead to 'BUG: kernel NULL pointer dereference'.
24 */
25void test_xdp_dev_bound_only_offdev(void)
26{
27	struct nstoken *tok = NULL;
28	__u32 ifindex;
29	int fd1 = -1;
30	int fd2 = -1;
31
32	SYS(out, "ip netns add " LOCAL_NETNS);
33	tok = open_netns(LOCAL_NETNS);
34	if (!ASSERT_OK_PTR(tok, "open_netns"))
35		goto out;
36	SYS(out, "ip link add eth42 type veth");
37	ifindex = if_nametoindex("eth42");
38	if (!ASSERT_NEQ(ifindex, 0, "if_nametoindex")) {
39		perror("if_nametoindex");
40		goto out;
41	}
42	fd1 = load_dummy_prog("dummy1", ifindex, BPF_F_XDP_DEV_BOUND_ONLY);
43	if (!ASSERT_GE(fd1, 0, "load_dummy_prog #1")) {
44		perror("load_dummy_prog #1");
45		goto out;
46	}
47	/* Program with ifindex is considered offloaded, however veth
48	 * does not support offload => error should be reported.
49	 */
50	fd2 = load_dummy_prog("dummy2", ifindex, 0);
51	ASSERT_EQ(fd2, -EINVAL, "load_dummy_prog #2 (offloaded)");
52
53out:
54	close(fd1);
55	close(fd2);
56	close_netns(tok);
57	/* eth42 was added inside netns, removing the netns will
58	 * also remove eth42 veth pair.
59	 */
60	SYS_NOFAIL("ip netns del " LOCAL_NETNS);
61}