| Message ID | 20220602143748.673971-3-roberto.sassu@huawei.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | bpf: Per-operation map permissions | expand |
On Thu, Jun 2, 2022 at 7:38 AM Roberto Sassu <roberto.sassu@huawei.com> wrote: > > Introduce the bpf_obj_get_flags() function, so that it is possible to > specify the needed permissions for obtaining a file descriptor from a > pinned object. > > Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com> > --- > tools/lib/bpf/bpf.c | 8 +++++++- > tools/lib/bpf/bpf.h | 1 + > tools/lib/bpf/libbpf.map | 1 + > 3 files changed, 9 insertions(+), 1 deletion(-) > > diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c > index 33bac2006043..a5fc40f6ce13 100644 > --- a/tools/lib/bpf/bpf.c > +++ b/tools/lib/bpf/bpf.c > @@ -670,18 +670,24 @@ int bpf_obj_pin(int fd, const char *pathname) > return libbpf_err_errno(ret); > } > > -int bpf_obj_get(const char *pathname) > +int bpf_obj_get_flags(const char *pathname, __u32 flags) same note about bpf_obj_get_opts() instead > { > union bpf_attr attr; > int fd; > > memset(&attr, 0, sizeof(attr)); > attr.pathname = ptr_to_u64((void *)pathname); > + attr.file_flags = flags; > > fd = sys_bpf_fd(BPF_OBJ_GET, &attr, sizeof(attr)); > return libbpf_err_errno(fd); > } > > +int bpf_obj_get(const char *pathname) > +{ > + return bpf_obj_get_flags(pathname, 0); > +} > + > int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type, > unsigned int flags) > { > diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h > index 20e4c852362d..6d0ceb2e90c4 100644 > --- a/tools/lib/bpf/bpf.h > +++ b/tools/lib/bpf/bpf.h > @@ -339,6 +339,7 @@ LIBBPF_API int bpf_map_update_batch(int fd, const void *keys, const void *values > const struct bpf_map_batch_opts *opts); > > LIBBPF_API int bpf_obj_pin(int fd, const char *pathname); > +LIBBPF_API int bpf_obj_get_flags(const char *pathname, __u32 flags); > LIBBPF_API int bpf_obj_get(const char *pathname); > > struct bpf_prog_attach_opts { > diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map > index 019278e66836..6c3ace12b27b 100644 > --- a/tools/lib/bpf/libbpf.map > +++ b/tools/lib/bpf/libbpf.map > @@ -467,6 +467,7 @@ LIBBPF_1.0.0 { > libbpf_bpf_map_type_str; > libbpf_bpf_prog_type_str; > bpf_map_get_fd_by_id_flags; > + bpf_obj_get_flags; > > local: *; > }; > -- > 2.25.1 >
diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c index 33bac2006043..a5fc40f6ce13 100644 --- a/tools/lib/bpf/bpf.c +++ b/tools/lib/bpf/bpf.c @@ -670,18 +670,24 @@ int bpf_obj_pin(int fd, const char *pathname) return libbpf_err_errno(ret); } -int bpf_obj_get(const char *pathname) +int bpf_obj_get_flags(const char *pathname, __u32 flags) { union bpf_attr attr; int fd; memset(&attr, 0, sizeof(attr)); attr.pathname = ptr_to_u64((void *)pathname); + attr.file_flags = flags; fd = sys_bpf_fd(BPF_OBJ_GET, &attr, sizeof(attr)); return libbpf_err_errno(fd); } +int bpf_obj_get(const char *pathname) +{ + return bpf_obj_get_flags(pathname, 0); +} + int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type, unsigned int flags) { diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h index 20e4c852362d..6d0ceb2e90c4 100644 --- a/tools/lib/bpf/bpf.h +++ b/tools/lib/bpf/bpf.h @@ -339,6 +339,7 @@ LIBBPF_API int bpf_map_update_batch(int fd, const void *keys, const void *values const struct bpf_map_batch_opts *opts); LIBBPF_API int bpf_obj_pin(int fd, const char *pathname); +LIBBPF_API int bpf_obj_get_flags(const char *pathname, __u32 flags); LIBBPF_API int bpf_obj_get(const char *pathname); struct bpf_prog_attach_opts { diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map index 019278e66836..6c3ace12b27b 100644 --- a/tools/lib/bpf/libbpf.map +++ b/tools/lib/bpf/libbpf.map @@ -467,6 +467,7 @@ LIBBPF_1.0.0 { libbpf_bpf_map_type_str; libbpf_bpf_prog_type_str; bpf_map_get_fd_by_id_flags; + bpf_obj_get_flags; local: *; };
Introduce the bpf_obj_get_flags() function, so that it is possible to specify the needed permissions for obtaining a file descriptor from a pinned object. Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com> --- tools/lib/bpf/bpf.c | 8 +++++++- tools/lib/bpf/bpf.h | 1 + tools/lib/bpf/libbpf.map | 1 + 3 files changed, 9 insertions(+), 1 deletion(-)