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bpf: Make internal bpf API independent of CONFIG_BPF_SYSCALL #ifdefs 

Socket filter code and other subsystems with upcoming eBPF
support should not need to deal with the fact that we have
CONFIG_BPF_SYSCALL defined or not.

Having the bpf syscall as a config option is a nice thing and
I'd expect it to stay that way for expert users (I presume one
day the default setting of it might change, though), but code
making use of it should not care if it's actually enabled or
not.

Instead, hide this via header files and let the rest deal with it.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1427312966-8434-2-git-send-email-ast@plumgrid.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Daniel Borkmann 2015-03-25 12:49:18 -07:00 committed by Ingo Molnar
parent 223aa646d5
commit 4e537f7fbd
1 changed files with 17 additions and 5 deletions
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22
include/linux/bpf.h
View File

@ -113,8 +113,6 @@ struct bpf_prog_type_list {
enum bpf_prog_type type;
};
void bpf_register_prog_type(struct bpf_prog_type_list *tl);
struct bpf_prog;
struct bpf_prog_aux {
@ -129,11 +127,25 @@ struct bpf_prog_aux {
};
#ifdef CONFIG_BPF_SYSCALL
void bpf_register_prog_type(struct bpf_prog_type_list *tl);
void bpf_prog_put(struct bpf_prog *prog);
#else
static inline void bpf_prog_put(struct bpf_prog *prog) {}
#endif
struct bpf_prog *bpf_prog_get(u32 ufd);
#else
static inline void bpf_register_prog_type(struct bpf_prog_type_list *tl)
{
}
static inline struct bpf_prog *bpf_prog_get(u32 ufd)
{
return ERR_PTR(-EOPNOTSUPP);
}
static inline void bpf_prog_put(struct bpf_prog *prog)
{
}
#endif
/* verify correctness of eBPF program */
int bpf_check(struct bpf_prog *fp, union bpf_attr *attr);