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    Subject[PATCH] samples/bpf: Fix sockex3: missing BPF prog type
    Date
    From: Rong Tao <rongtao@cestc.cn>

    since commit 450b167fb9be("libbpf: clean up SEC() handling"),
    sec_def_matches() does not recognize "socket/xxx" as "socket", therefore,
    the BPF program type is not recognized, we should add a custom program
    type handler for "socket/xxx".

    $ cd samples/bpf
    $ sudo ./sockex3
    libbpf: prog 'bpf_func_PARSE_IP': missing BPF prog type, check ELF section name 'socket/3'
    libbpf: prog 'bpf_func_PARSE_IP': failed to load: -22
    libbpf: failed to load object './sockex3_kern.o'
    ERROR: loading BPF object file failed

    Signed-off-by: Rong Tao <rongtao@cestc.cn>
    ---
    samples/bpf/sockex3_user.c | 15 +++++++++++++++
    1 file changed, 15 insertions(+)

    diff --git a/samples/bpf/sockex3_user.c b/samples/bpf/sockex3_user.c
    index cd6fa79df900..d18d7a3600b0 100644
    --- a/samples/bpf/sockex3_user.c
    +++ b/samples/bpf/sockex3_user.c
    @@ -22,6 +22,14 @@ struct pair {
    __u64 bytes;
    };

    +static int socket_prog_type_id;
    +
    +__attribute__((destructor))
    +static void unregister_socket_sec_handlers(void)
    +{
    + libbpf_unregister_prog_handler(socket_prog_type_id);
    +}
    +
    int main(int argc, char **argv)
    {
    int i, sock, key, fd, main_prog_fd, jmp_table_fd, hash_map_fd;
    @@ -31,6 +39,13 @@ int main(int argc, char **argv)
    char filename[256];
    FILE *f;

    + LIBBPF_OPTS(libbpf_prog_handler_opts, socket_opts,
    + .cookie = 1,
    + );
    +
    + socket_prog_type_id = libbpf_register_prog_handler("socket/",
    + BPF_PROG_TYPE_SOCKET_FILTER, 0, &socket_opts);
    +
    snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);

    obj = bpf_object__open_file(filename, NULL);
    --
    2.31.1
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