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65a7fa2e4e
Add APIs providing read-only access to bpf_program BPF instructions ([0]). This is useful for diagnostics purposes, but it also allows a cleaner support for cloning BPF programs after libbpf did all the FD resolution and CO-RE relocations, subprog instructions appending, etc. Currently, cloning BPF program is possible only through hijacking a half-broken bpf_program__set_prep() API, which doesn't really work well for anything but most primitive programs. For instance, set_prep() API doesn't allow adjusting BPF program load parameters which are necessary for loading fentry/fexit BPF programs (the case where BPF program cloning is a necessity if doing some sort of mass-attachment functionality). Given bpf_program__set_prep() API is set to be deprecated, having a cleaner alternative is a must. libbpf internally already keeps track of linear array of struct bpf_insn, so it's not hard to expose it. The only gotcha is that libbpf previously freed instructions array during bpf_object load time, which would make this API much less useful overall, because in between bpf_object__open() and bpf_object__load() a lot of changes to instructions are done by libbpf. So this patch makes libbpf hold onto prog->insns array even after BPF program loading. I think this is a small price for added functionality and improved introspection of BPF program code. See retsnoop PR ([1]) for how it can be used in practice and code savings compared to relying on bpf_program__set_prep(). [0] Closes: https://github.com/libbpf/libbpf/issues/298 [1] https://github.com/anakryiko/retsnoop/pull/1 Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20211025224531.1088894-3-andrii@kernel.org
403 lines
8.6 KiB
Plaintext
403 lines
8.6 KiB
Plaintext
LIBBPF_0.0.1 {
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global:
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bpf_btf_get_fd_by_id;
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bpf_create_map;
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bpf_create_map_in_map;
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bpf_create_map_in_map_node;
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bpf_create_map_name;
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bpf_create_map_node;
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bpf_create_map_xattr;
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bpf_load_btf;
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bpf_load_program;
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bpf_load_program_xattr;
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bpf_map__btf_key_type_id;
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bpf_map__btf_value_type_id;
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bpf_map__def;
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bpf_map__fd;
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bpf_map__is_offload_neutral;
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bpf_map__name;
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bpf_map__next;
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bpf_map__pin;
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bpf_map__prev;
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bpf_map__priv;
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bpf_map__reuse_fd;
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bpf_map__set_ifindex;
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bpf_map__set_inner_map_fd;
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bpf_map__set_priv;
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bpf_map__unpin;
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bpf_map_delete_elem;
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bpf_map_get_fd_by_id;
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bpf_map_get_next_id;
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bpf_map_get_next_key;
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bpf_map_lookup_and_delete_elem;
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bpf_map_lookup_elem;
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bpf_map_update_elem;
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bpf_obj_get;
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bpf_obj_get_info_by_fd;
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bpf_obj_pin;
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bpf_object__btf_fd;
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bpf_object__close;
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bpf_object__find_map_by_name;
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bpf_object__find_map_by_offset;
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bpf_object__find_program_by_title;
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bpf_object__kversion;
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bpf_object__load;
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bpf_object__name;
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bpf_object__next;
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bpf_object__open;
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bpf_object__open_buffer;
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bpf_object__open_xattr;
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bpf_object__pin;
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bpf_object__pin_maps;
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bpf_object__pin_programs;
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bpf_object__priv;
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bpf_object__set_priv;
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bpf_object__unload;
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bpf_object__unpin_maps;
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bpf_object__unpin_programs;
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bpf_perf_event_read_simple;
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bpf_prog_attach;
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bpf_prog_detach;
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bpf_prog_detach2;
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bpf_prog_get_fd_by_id;
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bpf_prog_get_next_id;
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bpf_prog_load;
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bpf_prog_load_xattr;
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bpf_prog_query;
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bpf_prog_test_run;
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bpf_prog_test_run_xattr;
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bpf_program__fd;
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bpf_program__is_kprobe;
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bpf_program__is_perf_event;
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bpf_program__is_raw_tracepoint;
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bpf_program__is_sched_act;
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bpf_program__is_sched_cls;
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bpf_program__is_socket_filter;
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bpf_program__is_tracepoint;
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bpf_program__is_xdp;
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bpf_program__load;
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bpf_program__next;
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bpf_program__nth_fd;
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bpf_program__pin;
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bpf_program__pin_instance;
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bpf_program__prev;
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bpf_program__priv;
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bpf_program__set_expected_attach_type;
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bpf_program__set_ifindex;
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bpf_program__set_kprobe;
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bpf_program__set_perf_event;
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bpf_program__set_prep;
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bpf_program__set_priv;
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bpf_program__set_raw_tracepoint;
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bpf_program__set_sched_act;
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bpf_program__set_sched_cls;
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bpf_program__set_socket_filter;
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bpf_program__set_tracepoint;
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bpf_program__set_type;
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bpf_program__set_xdp;
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bpf_program__title;
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bpf_program__unload;
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bpf_program__unpin;
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bpf_program__unpin_instance;
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bpf_prog_linfo__free;
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bpf_prog_linfo__new;
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bpf_prog_linfo__lfind_addr_func;
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bpf_prog_linfo__lfind;
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bpf_raw_tracepoint_open;
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bpf_set_link_xdp_fd;
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bpf_task_fd_query;
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bpf_verify_program;
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btf__fd;
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btf__find_by_name;
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btf__free;
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btf__get_from_id;
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btf__name_by_offset;
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btf__new;
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btf__resolve_size;
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btf__resolve_type;
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btf__type_by_id;
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libbpf_attach_type_by_name;
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libbpf_get_error;
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libbpf_prog_type_by_name;
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libbpf_set_print;
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libbpf_strerror;
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local:
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*;
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};
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LIBBPF_0.0.2 {
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global:
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bpf_probe_helper;
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bpf_probe_map_type;
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bpf_probe_prog_type;
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bpf_map__resize;
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bpf_map_lookup_elem_flags;
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bpf_object__btf;
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bpf_object__find_map_fd_by_name;
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bpf_get_link_xdp_id;
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btf__dedup;
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btf__get_map_kv_tids;
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btf__get_nr_types;
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btf__get_raw_data;
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btf__load;
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btf_ext__free;
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btf_ext__func_info_rec_size;
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btf_ext__get_raw_data;
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btf_ext__line_info_rec_size;
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btf_ext__new;
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btf_ext__reloc_func_info;
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btf_ext__reloc_line_info;
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xsk_umem__create;
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xsk_socket__create;
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xsk_umem__delete;
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xsk_socket__delete;
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xsk_umem__fd;
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xsk_socket__fd;
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bpf_program__get_prog_info_linear;
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bpf_program__bpil_addr_to_offs;
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bpf_program__bpil_offs_to_addr;
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} LIBBPF_0.0.1;
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LIBBPF_0.0.3 {
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global:
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bpf_map__is_internal;
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bpf_map_freeze;
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btf__finalize_data;
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} LIBBPF_0.0.2;
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LIBBPF_0.0.4 {
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global:
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bpf_link__destroy;
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bpf_object__load_xattr;
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bpf_program__attach_kprobe;
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bpf_program__attach_perf_event;
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bpf_program__attach_raw_tracepoint;
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bpf_program__attach_tracepoint;
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bpf_program__attach_uprobe;
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btf_dump__dump_type;
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btf_dump__free;
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btf_dump__new;
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btf__parse_elf;
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libbpf_num_possible_cpus;
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perf_buffer__free;
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perf_buffer__new;
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perf_buffer__new_raw;
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perf_buffer__poll;
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xsk_umem__create;
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} LIBBPF_0.0.3;
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LIBBPF_0.0.5 {
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global:
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bpf_btf_get_next_id;
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} LIBBPF_0.0.4;
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LIBBPF_0.0.6 {
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global:
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bpf_get_link_xdp_info;
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bpf_map__get_pin_path;
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bpf_map__is_pinned;
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bpf_map__set_pin_path;
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bpf_object__open_file;
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bpf_object__open_mem;
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bpf_program__attach_trace;
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bpf_program__get_expected_attach_type;
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bpf_program__get_type;
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bpf_program__is_tracing;
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bpf_program__set_tracing;
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bpf_program__size;
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btf__find_by_name_kind;
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libbpf_find_vmlinux_btf_id;
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} LIBBPF_0.0.5;
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LIBBPF_0.0.7 {
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global:
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btf_dump__emit_type_decl;
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bpf_link__disconnect;
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bpf_map__attach_struct_ops;
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bpf_map_delete_batch;
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bpf_map_lookup_and_delete_batch;
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bpf_map_lookup_batch;
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bpf_map_update_batch;
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bpf_object__find_program_by_name;
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bpf_object__attach_skeleton;
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bpf_object__destroy_skeleton;
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bpf_object__detach_skeleton;
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bpf_object__load_skeleton;
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bpf_object__open_skeleton;
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bpf_probe_large_insn_limit;
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bpf_prog_attach_xattr;
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bpf_program__attach;
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bpf_program__name;
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bpf_program__is_extension;
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bpf_program__is_struct_ops;
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bpf_program__set_extension;
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bpf_program__set_struct_ops;
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btf__align_of;
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libbpf_find_kernel_btf;
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} LIBBPF_0.0.6;
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LIBBPF_0.0.8 {
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global:
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bpf_link__fd;
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bpf_link__open;
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bpf_link__pin;
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bpf_link__pin_path;
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bpf_link__unpin;
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bpf_link__update_program;
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bpf_link_create;
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bpf_link_update;
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bpf_map__set_initial_value;
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bpf_program__attach_cgroup;
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bpf_program__attach_lsm;
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bpf_program__is_lsm;
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bpf_program__set_attach_target;
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bpf_program__set_lsm;
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bpf_set_link_xdp_fd_opts;
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} LIBBPF_0.0.7;
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LIBBPF_0.0.9 {
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global:
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bpf_enable_stats;
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bpf_iter_create;
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bpf_link_get_fd_by_id;
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bpf_link_get_next_id;
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bpf_program__attach_iter;
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bpf_program__attach_netns;
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perf_buffer__consume;
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ring_buffer__add;
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ring_buffer__consume;
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ring_buffer__free;
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ring_buffer__new;
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ring_buffer__poll;
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} LIBBPF_0.0.8;
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LIBBPF_0.1.0 {
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global:
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bpf_link__detach;
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bpf_link_detach;
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bpf_map__ifindex;
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bpf_map__key_size;
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bpf_map__map_flags;
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bpf_map__max_entries;
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bpf_map__numa_node;
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bpf_map__set_key_size;
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bpf_map__set_map_flags;
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bpf_map__set_max_entries;
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bpf_map__set_numa_node;
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bpf_map__set_type;
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bpf_map__set_value_size;
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bpf_map__type;
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bpf_map__value_size;
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bpf_program__attach_xdp;
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bpf_program__autoload;
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bpf_program__is_sk_lookup;
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bpf_program__set_autoload;
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bpf_program__set_sk_lookup;
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btf__parse;
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btf__parse_raw;
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btf__pointer_size;
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btf__set_fd;
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btf__set_pointer_size;
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} LIBBPF_0.0.9;
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LIBBPF_0.2.0 {
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global:
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bpf_prog_bind_map;
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bpf_prog_test_run_opts;
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bpf_program__attach_freplace;
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bpf_program__section_name;
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btf__add_array;
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btf__add_const;
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btf__add_enum;
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btf__add_enum_value;
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btf__add_datasec;
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btf__add_datasec_var_info;
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btf__add_field;
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btf__add_func;
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btf__add_func_param;
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btf__add_func_proto;
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btf__add_fwd;
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btf__add_int;
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btf__add_ptr;
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btf__add_restrict;
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btf__add_str;
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btf__add_struct;
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btf__add_typedef;
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btf__add_union;
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btf__add_var;
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btf__add_volatile;
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btf__endianness;
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btf__find_str;
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btf__new_empty;
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btf__set_endianness;
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btf__str_by_offset;
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perf_buffer__buffer_cnt;
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perf_buffer__buffer_fd;
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perf_buffer__epoll_fd;
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perf_buffer__consume_buffer;
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xsk_socket__create_shared;
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} LIBBPF_0.1.0;
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LIBBPF_0.3.0 {
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global:
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btf__base_btf;
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btf__parse_elf_split;
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btf__parse_raw_split;
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btf__parse_split;
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btf__new_empty_split;
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btf__new_split;
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ring_buffer__epoll_fd;
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xsk_setup_xdp_prog;
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xsk_socket__update_xskmap;
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} LIBBPF_0.2.0;
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LIBBPF_0.4.0 {
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global:
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btf__add_float;
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btf__add_type;
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bpf_linker__add_file;
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bpf_linker__finalize;
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bpf_linker__free;
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bpf_linker__new;
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bpf_map__inner_map;
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bpf_object__set_kversion;
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bpf_tc_attach;
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bpf_tc_detach;
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bpf_tc_hook_create;
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bpf_tc_hook_destroy;
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bpf_tc_query;
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} LIBBPF_0.3.0;
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LIBBPF_0.5.0 {
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global:
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bpf_map__initial_value;
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bpf_map__pin_path;
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bpf_map_lookup_and_delete_elem_flags;
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bpf_program__attach_kprobe_opts;
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bpf_program__attach_perf_event_opts;
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bpf_program__attach_tracepoint_opts;
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bpf_program__attach_uprobe_opts;
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bpf_object__gen_loader;
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btf__load_from_kernel_by_id;
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btf__load_from_kernel_by_id_split;
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btf__load_into_kernel;
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btf__load_module_btf;
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btf__load_vmlinux_btf;
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btf_dump__dump_type_data;
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libbpf_set_strict_mode;
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} LIBBPF_0.4.0;
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LIBBPF_0.6.0 {
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global:
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bpf_object__next_map;
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bpf_object__next_program;
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bpf_object__prev_map;
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bpf_object__prev_program;
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bpf_program__insn_cnt;
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bpf_program__insns;
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btf__add_btf;
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btf__add_decl_tag;
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btf__raw_data;
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btf__type_cnt;
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} LIBBPF_0.5.0;
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