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linux/tools/testing/selftests/bpf/progs/test_trace_ext_tracing.c

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selftests/bpf: Adding test for arg dereference in extension trace Adding test that setup following program: SEC("classifier/test_pkt_md_access") int test_pkt_md_access(struct __sk_buff *skb) with its extension: SEC("freplace/test_pkt_md_access") int test_pkt_md_access_new(struct __sk_buff *skb) and tracing that extension with: SEC("fentry/test_pkt_md_access_new") int BPF_PROG(fentry, struct sk_buff *skb) The test verifies that the tracing program can dereference skb argument properly. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/160138355603.48470.9072073357530773228.stgit@toke.dk
2020-09-29 14:45:56 +02:00
// SPDX-License-Identifier: GPL-2.0
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
__u64 fentry_called = 0;
SEC("fentry/test_pkt_md_access_new")
int BPF_PROG(fentry, struct sk_buff *skb)
{
fentry_called = skb->len;
return 0;
}
__u64 fexit_called = 0;
SEC("fexit/test_pkt_md_access_new")
int BPF_PROG(fexit, struct sk_buff *skb)
{
fexit_called = skb->len;
return 0;
}
char _license[] SEC("license") = "GPL";
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