libbpf: Per-symbol visibility for DSO
Make global symbols in libbpf DSO hidden by default with
-fvisibility=hidden and export symbols that are part of ABI explicitly
with __attribute__((visibility("default"))).
This is common practice that should prevent from accidentally exporting
a symbol, that is not supposed to be a part of ABI what, in turn,
improves both libbpf developer- and user-experiences. See [1] for more
details.
Export control becomes more important since more and more projects use
libbpf.
The patch doesn't export a bunch of netlink related functions since as
agreed in [2] they'll be reworked. That doesn't break bpftool since
bpftool links libbpf statically.
[1] https://www.akkadia.org/drepper/dsohowto.pdf (2.2 Export Control)
[2] https://www.mail-archive.com/netdev@vger.kernel.org/msg251434.html
Signed-off-by: Andrey Ignatov <rdna@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrey Ignatov
committed by
Alexei Starovoitov
Alexei Starovoitov
parent
421f4292f4
commit
ab9e084821
@@ -16,6 +16,10 @@
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#include <sys/types.h> // for size_t
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#include <linux/bpf.h>
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#ifndef LIBBPF_API
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#define LIBBPF_API __attribute__((visibility("default")))
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#endif
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enum libbpf_errno {
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__LIBBPF_ERRNO__START = 4000,
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@@ -37,7 +41,7 @@ enum libbpf_errno {
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__LIBBPF_ERRNO__END,
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};
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int libbpf_strerror(int err, char *buf, size_t size);
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LIBBPF_API int libbpf_strerror(int err, char *buf, size_t size);
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/*
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* __printf is defined in include/linux/compiler-gcc.h. However,
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@@ -47,9 +51,9 @@ int libbpf_strerror(int err, char *buf, size_t size);
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typedef int (*libbpf_print_fn_t)(const char *, ...)
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__attribute__((format(printf, 1, 2)));
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void libbpf_set_print(libbpf_print_fn_t warn,
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libbpf_print_fn_t info,
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libbpf_print_fn_t debug);
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LIBBPF_API void libbpf_set_print(libbpf_print_fn_t warn,
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libbpf_print_fn_t info,
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libbpf_print_fn_t debug);
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/* Hide internal to user */
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struct bpf_object;
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@@ -59,27 +63,28 @@ struct bpf_object_open_attr {
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enum bpf_prog_type prog_type;
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};
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struct bpf_object *bpf_object__open(const char *path);
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struct bpf_object *bpf_object__open_xattr(struct bpf_object_open_attr *attr);
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LIBBPF_API struct bpf_object *bpf_object__open(const char *path);
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LIBBPF_API struct bpf_object *
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bpf_object__open_xattr(struct bpf_object_open_attr *attr);
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struct bpf_object *__bpf_object__open_xattr(struct bpf_object_open_attr *attr,
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int flags);
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struct bpf_object *bpf_object__open_buffer(void *obj_buf,
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size_t obj_buf_sz,
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const char *name);
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int bpf_object__pin(struct bpf_object *object, const char *path);
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void bpf_object__close(struct bpf_object *object);
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LIBBPF_API struct bpf_object *bpf_object__open_buffer(void *obj_buf,
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size_t obj_buf_sz,
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const char *name);
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LIBBPF_API int bpf_object__pin(struct bpf_object *object, const char *path);
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LIBBPF_API void bpf_object__close(struct bpf_object *object);
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/* Load/unload object into/from kernel */
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int bpf_object__load(struct bpf_object *obj);
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int bpf_object__unload(struct bpf_object *obj);
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const char *bpf_object__name(struct bpf_object *obj);
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unsigned int bpf_object__kversion(struct bpf_object *obj);
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int bpf_object__btf_fd(const struct bpf_object *obj);
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LIBBPF_API int bpf_object__load(struct bpf_object *obj);
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LIBBPF_API int bpf_object__unload(struct bpf_object *obj);
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LIBBPF_API const char *bpf_object__name(struct bpf_object *obj);
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LIBBPF_API unsigned int bpf_object__kversion(struct bpf_object *obj);
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LIBBPF_API int bpf_object__btf_fd(const struct bpf_object *obj);
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struct bpf_program *
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LIBBPF_API struct bpf_program *
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bpf_object__find_program_by_title(struct bpf_object *obj, const char *title);
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struct bpf_object *bpf_object__next(struct bpf_object *prev);
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LIBBPF_API struct bpf_object *bpf_object__next(struct bpf_object *prev);
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#define bpf_object__for_each_safe(pos, tmp) \
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for ((pos) = bpf_object__next(NULL), \
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(tmp) = bpf_object__next(pos); \
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@@ -87,19 +92,20 @@ struct bpf_object *bpf_object__next(struct bpf_object *prev);
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(pos) = (tmp), (tmp) = bpf_object__next(tmp))
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typedef void (*bpf_object_clear_priv_t)(struct bpf_object *, void *);
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int bpf_object__set_priv(struct bpf_object *obj, void *priv,
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bpf_object_clear_priv_t clear_priv);
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void *bpf_object__priv(struct bpf_object *prog);
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LIBBPF_API int bpf_object__set_priv(struct bpf_object *obj, void *priv,
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bpf_object_clear_priv_t clear_priv);
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LIBBPF_API void *bpf_object__priv(struct bpf_object *prog);
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int libbpf_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type,
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enum bpf_attach_type *expected_attach_type);
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int libbpf_attach_type_by_name(const char *name,
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enum bpf_attach_type *attach_type);
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LIBBPF_API int
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libbpf_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type,
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enum bpf_attach_type *expected_attach_type);
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LIBBPF_API int libbpf_attach_type_by_name(const char *name,
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enum bpf_attach_type *attach_type);
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/* Accessors of bpf_program */
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struct bpf_program;
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struct bpf_program *bpf_program__next(struct bpf_program *prog,
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struct bpf_object *obj);
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LIBBPF_API struct bpf_program *bpf_program__next(struct bpf_program *prog,
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struct bpf_object *obj);
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#define bpf_object__for_each_program(pos, obj) \
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for ((pos) = bpf_program__next(NULL, (obj)); \
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@@ -109,21 +115,24 @@ struct bpf_program *bpf_program__next(struct bpf_program *prog,
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typedef void (*bpf_program_clear_priv_t)(struct bpf_program *,
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void *);
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int bpf_program__set_priv(struct bpf_program *prog, void *priv,
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bpf_program_clear_priv_t clear_priv);
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LIBBPF_API int bpf_program__set_priv(struct bpf_program *prog, void *priv,
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bpf_program_clear_priv_t clear_priv);
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void *bpf_program__priv(struct bpf_program *prog);
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void bpf_program__set_ifindex(struct bpf_program *prog, __u32 ifindex);
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LIBBPF_API void *bpf_program__priv(struct bpf_program *prog);
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LIBBPF_API void bpf_program__set_ifindex(struct bpf_program *prog,
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__u32 ifindex);
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const char *bpf_program__title(struct bpf_program *prog, bool needs_copy);
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LIBBPF_API const char *bpf_program__title(struct bpf_program *prog,
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bool needs_copy);
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int bpf_program__load(struct bpf_program *prog, char *license,
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__u32 kern_version);
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int bpf_program__fd(struct bpf_program *prog);
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int bpf_program__pin_instance(struct bpf_program *prog, const char *path,
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int instance);
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int bpf_program__pin(struct bpf_program *prog, const char *path);
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void bpf_program__unload(struct bpf_program *prog);
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LIBBPF_API int bpf_program__load(struct bpf_program *prog, char *license,
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__u32 kern_version);
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LIBBPF_API int bpf_program__fd(struct bpf_program *prog);
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LIBBPF_API int bpf_program__pin_instance(struct bpf_program *prog,
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const char *path,
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int instance);
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LIBBPF_API int bpf_program__pin(struct bpf_program *prog, const char *path);
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LIBBPF_API void bpf_program__unload(struct bpf_program *prog);
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struct bpf_insn;
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@@ -184,34 +193,36 @@ typedef int (*bpf_program_prep_t)(struct bpf_program *prog, int n,
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struct bpf_insn *insns, int insns_cnt,
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struct bpf_prog_prep_result *res);
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int bpf_program__set_prep(struct bpf_program *prog, int nr_instance,
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bpf_program_prep_t prep);
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LIBBPF_API int bpf_program__set_prep(struct bpf_program *prog, int nr_instance,
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bpf_program_prep_t prep);
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int bpf_program__nth_fd(struct bpf_program *prog, int n);
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LIBBPF_API int bpf_program__nth_fd(struct bpf_program *prog, int n);
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/*
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* Adjust type of BPF program. Default is kprobe.
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*/
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int bpf_program__set_socket_filter(struct bpf_program *prog);
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int bpf_program__set_tracepoint(struct bpf_program *prog);
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int bpf_program__set_raw_tracepoint(struct bpf_program *prog);
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int bpf_program__set_kprobe(struct bpf_program *prog);
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int bpf_program__set_sched_cls(struct bpf_program *prog);
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int bpf_program__set_sched_act(struct bpf_program *prog);
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int bpf_program__set_xdp(struct bpf_program *prog);
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int bpf_program__set_perf_event(struct bpf_program *prog);
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void bpf_program__set_type(struct bpf_program *prog, enum bpf_prog_type type);
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void bpf_program__set_expected_attach_type(struct bpf_program *prog,
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enum bpf_attach_type type);
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LIBBPF_API int bpf_program__set_socket_filter(struct bpf_program *prog);
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LIBBPF_API int bpf_program__set_tracepoint(struct bpf_program *prog);
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LIBBPF_API int bpf_program__set_raw_tracepoint(struct bpf_program *prog);
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LIBBPF_API int bpf_program__set_kprobe(struct bpf_program *prog);
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LIBBPF_API int bpf_program__set_sched_cls(struct bpf_program *prog);
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LIBBPF_API int bpf_program__set_sched_act(struct bpf_program *prog);
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LIBBPF_API int bpf_program__set_xdp(struct bpf_program *prog);
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LIBBPF_API int bpf_program__set_perf_event(struct bpf_program *prog);
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LIBBPF_API void bpf_program__set_type(struct bpf_program *prog,
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enum bpf_prog_type type);
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LIBBPF_API void
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bpf_program__set_expected_attach_type(struct bpf_program *prog,
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enum bpf_attach_type type);
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bool bpf_program__is_socket_filter(struct bpf_program *prog);
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bool bpf_program__is_tracepoint(struct bpf_program *prog);
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bool bpf_program__is_raw_tracepoint(struct bpf_program *prog);
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bool bpf_program__is_kprobe(struct bpf_program *prog);
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bool bpf_program__is_sched_cls(struct bpf_program *prog);
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bool bpf_program__is_sched_act(struct bpf_program *prog);
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bool bpf_program__is_xdp(struct bpf_program *prog);
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bool bpf_program__is_perf_event(struct bpf_program *prog);
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LIBBPF_API bool bpf_program__is_socket_filter(struct bpf_program *prog);
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LIBBPF_API bool bpf_program__is_tracepoint(struct bpf_program *prog);
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LIBBPF_API bool bpf_program__is_raw_tracepoint(struct bpf_program *prog);
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LIBBPF_API bool bpf_program__is_kprobe(struct bpf_program *prog);
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LIBBPF_API bool bpf_program__is_sched_cls(struct bpf_program *prog);
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LIBBPF_API bool bpf_program__is_sched_act(struct bpf_program *prog);
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LIBBPF_API bool bpf_program__is_xdp(struct bpf_program *prog);
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LIBBPF_API bool bpf_program__is_perf_event(struct bpf_program *prog);
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/*
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* No need for __attribute__((packed)), all members of 'bpf_map_def'
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@@ -232,39 +243,39 @@ struct bpf_map_def {
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* so no need to worry about a name clash.
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*/
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struct bpf_map;
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struct bpf_map *
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LIBBPF_API struct bpf_map *
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bpf_object__find_map_by_name(struct bpf_object *obj, const char *name);
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/*
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* Get bpf_map through the offset of corresponding struct bpf_map_def
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* in the BPF object file.
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*/
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struct bpf_map *
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LIBBPF_API struct bpf_map *
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bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset);
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struct bpf_map *
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LIBBPF_API struct bpf_map *
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bpf_map__next(struct bpf_map *map, struct bpf_object *obj);
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#define bpf_map__for_each(pos, obj) \
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for ((pos) = bpf_map__next(NULL, (obj)); \
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(pos) != NULL; \
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(pos) = bpf_map__next((pos), (obj)))
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int bpf_map__fd(struct bpf_map *map);
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const struct bpf_map_def *bpf_map__def(struct bpf_map *map);
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const char *bpf_map__name(struct bpf_map *map);
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__u32 bpf_map__btf_key_type_id(const struct bpf_map *map);
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__u32 bpf_map__btf_value_type_id(const struct bpf_map *map);
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LIBBPF_API int bpf_map__fd(struct bpf_map *map);
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LIBBPF_API const struct bpf_map_def *bpf_map__def(struct bpf_map *map);
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LIBBPF_API const char *bpf_map__name(struct bpf_map *map);
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LIBBPF_API __u32 bpf_map__btf_key_type_id(const struct bpf_map *map);
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LIBBPF_API __u32 bpf_map__btf_value_type_id(const struct bpf_map *map);
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typedef void (*bpf_map_clear_priv_t)(struct bpf_map *, void *);
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int bpf_map__set_priv(struct bpf_map *map, void *priv,
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bpf_map_clear_priv_t clear_priv);
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void *bpf_map__priv(struct bpf_map *map);
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int bpf_map__reuse_fd(struct bpf_map *map, int fd);
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bool bpf_map__is_offload_neutral(struct bpf_map *map);
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void bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex);
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int bpf_map__pin(struct bpf_map *map, const char *path);
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LIBBPF_API int bpf_map__set_priv(struct bpf_map *map, void *priv,
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bpf_map_clear_priv_t clear_priv);
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LIBBPF_API void *bpf_map__priv(struct bpf_map *map);
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LIBBPF_API int bpf_map__reuse_fd(struct bpf_map *map, int fd);
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LIBBPF_API bool bpf_map__is_offload_neutral(struct bpf_map *map);
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LIBBPF_API void bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex);
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LIBBPF_API int bpf_map__pin(struct bpf_map *map, const char *path);
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long libbpf_get_error(const void *ptr);
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LIBBPF_API long libbpf_get_error(const void *ptr);
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struct bpf_prog_load_attr {
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const char *file;
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@@ -273,12 +284,12 @@ struct bpf_prog_load_attr {
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int ifindex;
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};
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int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr,
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struct bpf_object **pobj, int *prog_fd);
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int bpf_prog_load(const char *file, enum bpf_prog_type type,
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struct bpf_object **pobj, int *prog_fd);
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LIBBPF_API int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr,
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struct bpf_object **pobj, int *prog_fd);
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LIBBPF_API int bpf_prog_load(const char *file, enum bpf_prog_type type,
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struct bpf_object **pobj, int *prog_fd);
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int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags);
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LIBBPF_API int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags);
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enum bpf_perf_event_ret {
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LIBBPF_PERF_EVENT_DONE = 0,
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@@ -288,10 +299,11 @@ enum bpf_perf_event_ret {
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typedef enum bpf_perf_event_ret (*bpf_perf_event_print_t)(void *event,
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void *priv);
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int bpf_perf_event_read_simple(void *mem, unsigned long size,
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unsigned long page_size,
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void **buf, size_t *buf_len,
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bpf_perf_event_print_t fn, void *priv);
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LIBBPF_API int bpf_perf_event_read_simple(void *mem, unsigned long size,
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unsigned long page_size,
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void **buf, size_t *buf_len,
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bpf_perf_event_print_t fn,
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void *priv);
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struct nlattr;
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typedef int (*libbpf_dump_nlmsg_t)(void *cookie, void *msg, struct nlattr **tb);
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