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libbpf: Add bpf_cookie support to bpf_link_create() API

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Add ability to specify bpf_cookie value when creating BPF perf link with
bpf_link_create() low-level API.

Given BPF_LINK_CREATE command is growing and keeps getting new fields that are
specific to the type of BPF_LINK, extend libbpf side of bpf_link_create() API
and corresponding OPTS struct to accomodate such changes. Add extra checks to
prevent using incompatible/unexpected combinations of fields.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20210815070609.987780-11-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko
2021-08-15 00:06:03 -07:00
committed by Andrii Nakryiko
parent d23679b415
commit a3f8c5a306
3 changed files with 54 additions and 18 deletions
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32
src/libbpf_internal.h
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@@ -196,6 +196,17 @@ void *libbpf_add_mem(void **data, size_t *cap_cnt, size_t elem_sz,
size_t cur_cnt, size_t max_cnt, size_t add_cnt);
int libbpf_ensure_mem(void **data, size_t *cap_cnt, size_t elem_sz, size_t need_cnt);
static inline bool libbpf_is_mem_zeroed(const char *p, ssize_t len)
{
while (len > 0) {
if (*p)
return false;
p++;
len--;
}
return true;
}
static inline bool libbpf_validate_opts(const char *opts,
size_t opts_sz, size_t user_sz,
const char *type_name)
@@ -204,16 +215,9 @@ static inline bool libbpf_validate_opts(const char *opts,
pr_warn("%s size (%zu) is too small\n", type_name, user_sz);
return false;
}
if (user_sz > opts_sz) {
size_t i;
for (i = opts_sz; i < user_sz; i++) {
if (opts[i]) {
pr_warn("%s has non-zero extra bytes\n",
type_name);
return false;
}
}
if (!libbpf_is_mem_zeroed(opts + opts_sz, (ssize_t)user_sz - opts_sz)) {
pr_warn("%s has non-zero extra bytes\n", type_name);
return false;
}
return true;
}
@@ -233,6 +237,14 @@ static inline bool libbpf_validate_opts(const char *opts,
(opts)->field = value; \
} while (0)
#define OPTS_ZEROED(opts, last_nonzero_field) \
({ \
ssize_t __off = offsetofend(typeof(*(opts)), last_nonzero_field); \
!(opts) || libbpf_is_mem_zeroed((const void *)opts + __off, \
(opts)->sz - __off); \
})
int parse_cpu_mask_str(const char *s, bool **mask, int *mask_sz);
int parse_cpu_mask_file(const char *fcpu, bool **mask, int *mask_sz);
int libbpf__load_raw_btf(const char *raw_types, size_t types_len,