62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <net/if.h>
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#include <test_progs.h>
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#include <network_helpers.h>
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#define LOCAL_NETNS "xdp_dev_bound_only_netns"
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static int load_dummy_prog(char *name, __u32 ifindex, __u32 flags)
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{
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struct bpf_insn insns[] = { BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN() };
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LIBBPF_OPTS(bpf_prog_load_opts, opts);
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opts.prog_flags = flags;
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opts.prog_ifindex = ifindex;
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return bpf_prog_load(BPF_PROG_TYPE_XDP, name, "GPL", insns, ARRAY_SIZE(insns), &opts);
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}
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/* A test case for bpf_offload_netdev->offload handling bug:
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* - create a veth device (does not support offload);
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* - create a device bound XDP program with BPF_F_XDP_DEV_BOUND_ONLY flag
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* (such programs are not offloaded);
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* - create a device bound XDP program without flags (such programs are offloaded).
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* This might lead to 'BUG: kernel NULL pointer dereference'.
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*/
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void test_xdp_dev_bound_only_offdev(void)
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{
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struct nstoken *tok = NULL;
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__u32 ifindex;
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int fd1 = -1;
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int fd2 = -1;
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SYS(out, "ip netns add " LOCAL_NETNS);
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tok = open_netns(LOCAL_NETNS);
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if (!ASSERT_OK_PTR(tok, "open_netns"))
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goto out;
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SYS(out, "ip link add eth42 type veth");
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ifindex = if_nametoindex("eth42");
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if (!ASSERT_NEQ(ifindex, 0, "if_nametoindex")) {
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perror("if_nametoindex");
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goto out;
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}
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fd1 = load_dummy_prog("dummy1", ifindex, BPF_F_XDP_DEV_BOUND_ONLY);
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if (!ASSERT_GE(fd1, 0, "load_dummy_prog #1")) {
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perror("load_dummy_prog #1");
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goto out;
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}
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/* Program with ifindex is considered offloaded, however veth
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* does not support offload => error should be reported.
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*/
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fd2 = load_dummy_prog("dummy2", ifindex, 0);
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ASSERT_EQ(fd2, -EINVAL, "load_dummy_prog #2 (offloaded)");
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out:
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close(fd1);
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close(fd2);
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close_netns(tok);
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/* eth42 was added inside netns, removing the netns will
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* also remove eth42 veth pair.
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*/
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SYS_NOFAIL("ip netns del " LOCAL_NETNS);
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}
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