diff mbox series

[05/18] bpf-preload: Generate static variables

Message ID 20220328175033.2437312-6-roberto.sassu@huawei.com (mailing list archive)
State New
Headers show
Series bpf: Secure and authenticated preloading of eBPF programs | expand

Commit Message

Roberto Sassu March 28, 2022, 5:50 p.m. UTC
The first part of the preload code generation consists in generating the
static variables to be used by the code itself: the links and maps to be
pinned, and the skeleton. Generation of the preload variables and methods
is enabled with the option -P added to 'bpftool gen skeleton'.

The existing variables maps_link and progs_links in bpf_preload_kern.c have
been renamed respectively to dump_bpf_map_link and dump_bpf_prog_link, to
match the name of the variables in the main structure of the light
skeleton.

Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
---
 kernel/bpf/preload/bpf_preload_kern.c         |  35 +-
 kernel/bpf/preload/iterators/Makefile         |   2 +-
 .../bpf/preload/iterators/iterators.lskel.h   | 378 +++++++++---------
 .../bpf/bpftool/Documentation/bpftool-gen.rst |   5 +
 tools/bpf/bpftool/bash-completion/bpftool     |   2 +-
 tools/bpf/bpftool/gen.c                       |  27 ++
 tools/bpf/bpftool/main.c                      |   7 +-
 tools/bpf/bpftool/main.h                      |   1 +
 8 files changed, 254 insertions(+), 203 deletions(-)

Comments

Andrii Nakryiko March 29, 2022, 11:51 p.m. UTC | #1
On Mon, Mar 28, 2022 at 10:52 AM Roberto Sassu <roberto.sassu@huawei.com> wrote:
>
> The first part of the preload code generation consists in generating the
> static variables to be used by the code itself: the links and maps to be
> pinned, and the skeleton. Generation of the preload variables and methods
> is enabled with the option -P added to 'bpftool gen skeleton'.
>
> The existing variables maps_link and progs_links in bpf_preload_kern.c have
> been renamed respectively to dump_bpf_map_link and dump_bpf_prog_link, to
> match the name of the variables in the main structure of the light
> skeleton.
>
> Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
> ---
>  kernel/bpf/preload/bpf_preload_kern.c         |  35 +-
>  kernel/bpf/preload/iterators/Makefile         |   2 +-
>  .../bpf/preload/iterators/iterators.lskel.h   | 378 +++++++++---------
>  .../bpf/bpftool/Documentation/bpftool-gen.rst |   5 +
>  tools/bpf/bpftool/bash-completion/bpftool     |   2 +-
>  tools/bpf/bpftool/gen.c                       |  27 ++
>  tools/bpf/bpftool/main.c                      |   7 +-
>  tools/bpf/bpftool/main.h                      |   1 +
>  8 files changed, 254 insertions(+), 203 deletions(-)
>

[...]

> +__attribute__((unused)) static void
> +iterators_bpf__assert(struct iterators_bpf *s)
> +{
> +#ifdef __cplusplus
> +#define _Static_assert static_assert
> +#endif
> +#ifdef __cplusplus
> +#undef _Static_assert
> +#endif
> +}
> +
> +static struct bpf_link *dump_bpf_map_link;
> +static struct bpf_link *dump_bpf_prog_link;
> +static struct iterators_bpf *skel;

I don't understand what is this and what for? You are making an
assumption that light skeleton can be instantiated just once, why? And
adding extra bpftool option to light skeleton codegen just to save a
bit of typing at the place where light skeleton is actually
instantiated and used doesn't seems like a right approach.

Further, even if this is the way to go, please split out bpftool
changes from kernel changes. There is nothing requiring them to be
coupled together.

[...]
Roberto Sassu March 30, 2022, 7:44 a.m. UTC | #2
> From: Andrii Nakryiko [mailto:andrii.nakryiko@gmail.com]
> Sent: Wednesday, March 30, 2022 1:52 AM
> On Mon, Mar 28, 2022 at 10:52 AM Roberto Sassu
> <roberto.sassu@huawei.com> wrote:
> >
> > The first part of the preload code generation consists in generating the
> > static variables to be used by the code itself: the links and maps to be
> > pinned, and the skeleton. Generation of the preload variables and
> methods
> > is enabled with the option -P added to 'bpftool gen skeleton'.
> >
> > The existing variables maps_link and progs_links in bpf_preload_kern.c
> have
> > been renamed respectively to dump_bpf_map_link and
> dump_bpf_prog_link, to
> > match the name of the variables in the main structure of the light
> > skeleton.
> >
> > Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
> > ---
> >  kernel/bpf/preload/bpf_preload_kern.c         |  35 +-
> >  kernel/bpf/preload/iterators/Makefile         |   2 +-
> >  .../bpf/preload/iterators/iterators.lskel.h   | 378 +++++++++---------
> >  .../bpf/bpftool/Documentation/bpftool-gen.rst |   5 +
> >  tools/bpf/bpftool/bash-completion/bpftool     |   2 +-
> >  tools/bpf/bpftool/gen.c                       |  27 ++
> >  tools/bpf/bpftool/main.c                      |   7 +-
> >  tools/bpf/bpftool/main.h                      |   1 +
> >  8 files changed, 254 insertions(+), 203 deletions(-)
> >
> 
> [...]
> 
> > +__attribute__((unused)) static void
> > +iterators_bpf__assert(struct iterators_bpf *s)
> > +{
> > +#ifdef __cplusplus
> > +#define _Static_assert static_assert
> > +#endif
> > +#ifdef __cplusplus
> > +#undef _Static_assert
> > +#endif
> > +}
> > +
> > +static struct bpf_link *dump_bpf_map_link;
> > +static struct bpf_link *dump_bpf_prog_link;
> > +static struct iterators_bpf *skel;
> 
> I don't understand what is this and what for? You are making an
> assumption that light skeleton can be instantiated just once, why? And
> adding extra bpftool option to light skeleton codegen just to save a
> bit of typing at the place where light skeleton is actually
> instantiated and used doesn't seems like a right approach.

True, iterator_bpf is simple. Writing the preloading code
for it is simple. But, what if you wanted to preload an LSM
with 10 hooks or more?

Ok, regarding where the preloading code should be, I will
try to move the generated code to the kernel module instead
of the light skeleton.

Thanks

Roberto

HUAWEI TECHNOLOGIES Duesseldorf GmbH, HRB 56063
Managing Director: Li Peng, Zhong Ronghua

> Further, even if this is the way to go, please split out bpftool
> changes from kernel changes. There is nothing requiring them to be
> coupled together.
> 
> [...]
Roberto Sassu March 30, 2022, 3:12 p.m. UTC | #3
> From: Roberto Sassu
> Sent: Wednesday, March 30, 2022 9:45 AM
> > From: Andrii Nakryiko [mailto:andrii.nakryiko@gmail.com]
> > Sent: Wednesday, March 30, 2022 1:52 AM
> > On Mon, Mar 28, 2022 at 10:52 AM Roberto Sassu
> > <roberto.sassu@huawei.com> wrote:
> > >
> > > The first part of the preload code generation consists in generating the
> > > static variables to be used by the code itself: the links and maps to be
> > > pinned, and the skeleton. Generation of the preload variables and
> > methods
> > > is enabled with the option -P added to 'bpftool gen skeleton'.
> > >
> > > The existing variables maps_link and progs_links in bpf_preload_kern.c
> > have
> > > been renamed respectively to dump_bpf_map_link and
> > dump_bpf_prog_link, to
> > > match the name of the variables in the main structure of the light
> > > skeleton.
> > >
> > > Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
> > > ---
> > >  kernel/bpf/preload/bpf_preload_kern.c         |  35 +-
> > >  kernel/bpf/preload/iterators/Makefile         |   2 +-
> > >  .../bpf/preload/iterators/iterators.lskel.h   | 378 +++++++++---------
> > >  .../bpf/bpftool/Documentation/bpftool-gen.rst |   5 +
> > >  tools/bpf/bpftool/bash-completion/bpftool     |   2 +-
> > >  tools/bpf/bpftool/gen.c                       |  27 ++
> > >  tools/bpf/bpftool/main.c                      |   7 +-
> > >  tools/bpf/bpftool/main.h                      |   1 +
> > >  8 files changed, 254 insertions(+), 203 deletions(-)
> > >
> >
> > [...]
> >
> > > +__attribute__((unused)) static void
> > > +iterators_bpf__assert(struct iterators_bpf *s)
> > > +{
> > > +#ifdef __cplusplus
> > > +#define _Static_assert static_assert
> > > +#endif
> > > +#ifdef __cplusplus
> > > +#undef _Static_assert
> > > +#endif
> > > +}
> > > +
> > > +static struct bpf_link *dump_bpf_map_link;
> > > +static struct bpf_link *dump_bpf_prog_link;
> > > +static struct iterators_bpf *skel;
> >
> > I don't understand what is this and what for? You are making an
> > assumption that light skeleton can be instantiated just once, why? And
> > adding extra bpftool option to light skeleton codegen just to save a
> > bit of typing at the place where light skeleton is actually
> > instantiated and used doesn't seems like a right approach.
> 
> True, iterator_bpf is simple. Writing the preloading code
> for it is simple. But, what if you wanted to preload an LSM
> with 10 hooks or more?
> 
> Ok, regarding where the preloading code should be, I will
> try to move the generated code to the kernel module instead
> of the light skeleton.

Done. I moved everything from the light skeleton to the kernel
module. The changes now are also well separated, and
regeneration of the kernel module occurs only after all the
generation code is added to bpftool.

I pushed a new branch:

https://github.com/robertosassu/linux/commits/bpf-preload-v2-devel-v2

Roberto

HUAWEI TECHNOLOGIES Duesseldorf GmbH, HRB 56063
Managing Director: Li Peng, Zhong Ronghua
Andrii Nakryiko April 4, 2022, 12:22 a.m. UTC | #4
On Wed, Mar 30, 2022 at 12:44 AM Roberto Sassu <roberto.sassu@huawei.com> wrote:
>
> > From: Andrii Nakryiko [mailto:andrii.nakryiko@gmail.com]
> > Sent: Wednesday, March 30, 2022 1:52 AM
> > On Mon, Mar 28, 2022 at 10:52 AM Roberto Sassu
> > <roberto.sassu@huawei.com> wrote:
> > >
> > > The first part of the preload code generation consists in generating the
> > > static variables to be used by the code itself: the links and maps to be
> > > pinned, and the skeleton. Generation of the preload variables and
> > methods
> > > is enabled with the option -P added to 'bpftool gen skeleton'.
> > >
> > > The existing variables maps_link and progs_links in bpf_preload_kern.c
> > have
> > > been renamed respectively to dump_bpf_map_link and
> > dump_bpf_prog_link, to
> > > match the name of the variables in the main structure of the light
> > > skeleton.
> > >
> > > Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
> > > ---
> > >  kernel/bpf/preload/bpf_preload_kern.c         |  35 +-
> > >  kernel/bpf/preload/iterators/Makefile         |   2 +-
> > >  .../bpf/preload/iterators/iterators.lskel.h   | 378 +++++++++---------
> > >  .../bpf/bpftool/Documentation/bpftool-gen.rst |   5 +
> > >  tools/bpf/bpftool/bash-completion/bpftool     |   2 +-
> > >  tools/bpf/bpftool/gen.c                       |  27 ++
> > >  tools/bpf/bpftool/main.c                      |   7 +-
> > >  tools/bpf/bpftool/main.h                      |   1 +
> > >  8 files changed, 254 insertions(+), 203 deletions(-)
> > >
> >
> > [...]
> >
> > > +__attribute__((unused)) static void
> > > +iterators_bpf__assert(struct iterators_bpf *s)
> > > +{
> > > +#ifdef __cplusplus
> > > +#define _Static_assert static_assert
> > > +#endif
> > > +#ifdef __cplusplus
> > > +#undef _Static_assert
> > > +#endif
> > > +}
> > > +
> > > +static struct bpf_link *dump_bpf_map_link;
> > > +static struct bpf_link *dump_bpf_prog_link;
> > > +static struct iterators_bpf *skel;
> >
> > I don't understand what is this and what for? You are making an
> > assumption that light skeleton can be instantiated just once, why? And
> > adding extra bpftool option to light skeleton codegen just to save a
> > bit of typing at the place where light skeleton is actually
> > instantiated and used doesn't seems like a right approach.
>
> True, iterator_bpf is simple. Writing the preloading code
> for it is simple. But, what if you wanted to preload an LSM
> with 10 hooks or more?

I suppose you'd write a straightforward code to do pinning ten times
for ten different programs to ten different paths. But with this you
don't have to establish a random set of conventions that might not
apply in all the situations to anyone that would try to use this
feature.

Worst case, light skeleton can be extended to provide a way to iterate
all programs programmatically.

>
> Ok, regarding where the preloading code should be, I will
> try to move the generated code to the kernel module instead
> of the light skeleton.
>
> Thanks
>
> Roberto
>
> HUAWEI TECHNOLOGIES Duesseldorf GmbH, HRB 56063
> Managing Director: Li Peng, Zhong Ronghua
>
> > Further, even if this is the way to go, please split out bpftool
> > changes from kernel changes. There is nothing requiring them to be
> > coupled together.
> >
> > [...]
diff mbox series

Patch

diff --git a/kernel/bpf/preload/bpf_preload_kern.c b/kernel/bpf/preload/bpf_preload_kern.c
index d70047108bb3..485589e03bd2 100644
--- a/kernel/bpf/preload/bpf_preload_kern.c
+++ b/kernel/bpf/preload/bpf_preload_kern.c
@@ -5,15 +5,12 @@ 
 #include <linux/bpf_preload.h>
 #include "iterators/iterators.lskel.h"
 
-static struct bpf_link *maps_link, *progs_link;
-static struct iterators_bpf *skel;
-
 static void free_links_and_skel(void)
 {
-	if (!IS_ERR_OR_NULL(maps_link))
-		bpf_link_put(maps_link);
-	if (!IS_ERR_OR_NULL(progs_link))
-		bpf_link_put(progs_link);
+	if (!IS_ERR_OR_NULL(dump_bpf_map_link))
+		bpf_link_put(dump_bpf_map_link);
+	if (!IS_ERR_OR_NULL(dump_bpf_prog_link))
+		bpf_link_put(dump_bpf_prog_link);
 	iterators_bpf__destroy(skel);
 }
 
@@ -21,23 +18,23 @@  static int preload(struct dentry *parent)
 {
 	int err;
 
-	bpf_link_inc(maps_link);
-	bpf_link_inc(progs_link);
+	bpf_link_inc(dump_bpf_map_link);
+	bpf_link_inc(dump_bpf_prog_link);
 
-	err = bpf_obj_do_pin_kernel(parent, "maps.debug", maps_link,
+	err = bpf_obj_do_pin_kernel(parent, "maps.debug", dump_bpf_map_link,
 				    BPF_TYPE_LINK);
 	if (err)
 		goto undo;
 
-	err = bpf_obj_do_pin_kernel(parent, "progs.debug", progs_link,
+	err = bpf_obj_do_pin_kernel(parent, "progs.debug", dump_bpf_prog_link,
 				    BPF_TYPE_LINK);
 	if (err)
 		goto undo;
 
 	return 0;
 undo:
-	bpf_link_put(maps_link);
-	bpf_link_put(progs_link);
+	bpf_link_put(dump_bpf_map_link);
+	bpf_link_put(dump_bpf_prog_link);
 	return err;
 }
 
@@ -59,14 +56,14 @@  static int load_skel(void)
 	err = iterators_bpf__attach(skel);
 	if (err)
 		goto out;
-	maps_link = bpf_link_get_from_fd(skel->links.dump_bpf_map_fd);
-	if (IS_ERR(maps_link)) {
-		err = PTR_ERR(maps_link);
+	dump_bpf_map_link = bpf_link_get_from_fd(skel->links.dump_bpf_map_fd);
+	if (IS_ERR(dump_bpf_map_link)) {
+		err = PTR_ERR(dump_bpf_map_link);
 		goto out;
 	}
-	progs_link = bpf_link_get_from_fd(skel->links.dump_bpf_prog_fd);
-	if (IS_ERR(progs_link)) {
-		err = PTR_ERR(progs_link);
+	dump_bpf_prog_link = bpf_link_get_from_fd(skel->links.dump_bpf_prog_fd);
+	if (IS_ERR(dump_bpf_prog_link)) {
+		err = PTR_ERR(dump_bpf_prog_link);
 		goto out;
 	}
 	/* Avoid taking over stdin/stdout/stderr of init process. Zeroing out
diff --git a/kernel/bpf/preload/iterators/Makefile b/kernel/bpf/preload/iterators/Makefile
index bfe24f8c5a20..d36a822d3e16 100644
--- a/kernel/bpf/preload/iterators/Makefile
+++ b/kernel/bpf/preload/iterators/Makefile
@@ -43,7 +43,7 @@  clean:
 
 iterators.lskel.h: $(OUTPUT)/iterators.bpf.o | $(BPFTOOL)
 	$(call msg,GEN-SKEL,$@)
-	$(Q)$(BPFTOOL) gen skeleton -L $< > $@
+	$(Q)$(BPFTOOL) gen skeleton -L -P $< > $@
 
 
 $(OUTPUT)/iterators.bpf.o: iterators.bpf.c $(BPFOBJ) | $(OUTPUT)
diff --git a/kernel/bpf/preload/iterators/iterators.lskel.h b/kernel/bpf/preload/iterators/iterators.lskel.h
index 70f236a82fe1..9794acdfacf9 100644
--- a/kernel/bpf/preload/iterators/iterators.lskel.h
+++ b/kernel/bpf/preload/iterators/iterators.lskel.h
@@ -103,7 +103,7 @@  iterators_bpf__load(struct iterators_bpf *skel)
 	int err;
 
 	opts.ctx = (struct bpf_loader_ctx *)skel;
-	opts.data_sz = 6056;
+	opts.data_sz = 6088;
 	opts.data = (void *)"\
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
@@ -138,63 +138,64 @@  iterators_bpf__load(struct iterators_bpf *skel)
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x9f\xeb\x01\0\
-\x18\0\0\0\0\0\0\0\x1c\x04\0\0\x1c\x04\0\0\xf9\x04\0\0\0\0\0\0\0\0\0\x02\x02\0\
+\x18\0\0\0\0\0\0\0\x1c\x04\0\0\x1c\x04\0\0\x0b\x05\0\0\0\0\0\0\0\0\0\x02\x02\0\
 \0\0\x01\0\0\0\x02\0\0\x04\x10\0\0\0\x13\0\0\0\x03\0\0\0\0\0\0\0\x18\0\0\0\x04\
 \0\0\0\x40\0\0\0\0\0\0\0\0\0\0\x02\x08\0\0\0\0\0\0\0\0\0\0\x02\x0d\0\0\0\0\0\0\
 \0\x01\0\0\x0d\x06\0\0\0\x1c\0\0\0\x01\0\0\0\x20\0\0\0\0\0\0\x01\x04\0\0\0\x20\
-\0\0\x01\x24\0\0\0\x01\0\0\x0c\x05\0\0\0\xa3\0\0\0\x03\0\0\x04\x18\0\0\0\xb1\0\
-\0\0\x09\0\0\0\0\0\0\0\xb5\0\0\0\x0b\0\0\0\x40\0\0\0\xc0\0\0\0\x0b\0\0\0\x80\0\
-\0\0\0\0\0\0\0\0\0\x02\x0a\0\0\0\xc8\0\0\0\0\0\0\x07\0\0\0\0\xd1\0\0\0\0\0\0\
-\x08\x0c\0\0\0\xd7\0\0\0\0\0\0\x01\x08\0\0\0\x40\0\0\0\x94\x01\0\0\x03\0\0\x04\
-\x18\0\0\0\x9c\x01\0\0\x0e\0\0\0\0\0\0\0\x9f\x01\0\0\x11\0\0\0\x20\0\0\0\xa4\
-\x01\0\0\x0e\0\0\0\xa0\0\0\0\xb0\x01\0\0\0\0\0\x08\x0f\0\0\0\xb6\x01\0\0\0\0\0\
-\x01\x04\0\0\0\x20\0\0\0\xc3\x01\0\0\0\0\0\x01\x01\0\0\0\x08\0\0\x01\0\0\0\0\0\
-\0\0\x03\0\0\0\0\x10\0\0\0\x12\0\0\0\x10\0\0\0\xc8\x01\0\0\0\0\0\x01\x04\0\0\0\
-\x20\0\0\0\0\0\0\0\0\0\0\x02\x14\0\0\0\x2c\x02\0\0\x02\0\0\x04\x10\0\0\0\x13\0\
-\0\0\x03\0\0\0\0\0\0\0\x3f\x02\0\0\x15\0\0\0\x40\0\0\0\0\0\0\0\0\0\0\x02\x18\0\
-\0\0\0\0\0\0\x01\0\0\x0d\x06\0\0\0\x1c\0\0\0\x13\0\0\0\x44\x02\0\0\x01\0\0\x0c\
-\x16\0\0\0\x90\x02\0\0\x01\0\0\x04\x08\0\0\0\x99\x02\0\0\x19\0\0\0\0\0\0\0\0\0\
-\0\0\0\0\0\x02\x1a\0\0\0\xea\x02\0\0\x06\0\0\x04\x38\0\0\0\x9c\x01\0\0\x0e\0\0\
-\0\0\0\0\0\x9f\x01\0\0\x11\0\0\0\x20\0\0\0\xf7\x02\0\0\x1b\0\0\0\xc0\0\0\0\x08\
-\x03\0\0\x15\0\0\0\0\x01\0\0\x11\x03\0\0\x1d\0\0\0\x40\x01\0\0\x1b\x03\0\0\x1e\
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@@ -237,90 +238,90 @@  iterators_bpf__load(struct iterators_bpf *skel)
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+\x70\x66\x5f\x70\x72\x6f\x67\0\0\0\0\0\0\0";
 	opts.insns_sz = 2216;
 	opts.insns = (void *)"\
 \xbf\x16\0\0\0\0\0\0\xbf\xa1\0\0\0\0\0\0\x07\x01\0\0\x78\xff\xff\xff\xb7\x02\0\
@@ -331,66 +332,66 @@  iterators_bpf__load(struct iterators_bpf *skel)
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+\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xe8\x11\0\0\x61\x01\0\0\0\0\0\0\xd5\
 \x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\xc5\x07\x4a\xff\0\0\
-\0\0\x63\x7a\x80\xff\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x10\x12\0\0\x18\x61\0\
-\0\0\0\0\0\0\0\0\0\x10\x17\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\
-\x18\x12\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x08\x17\0\0\x7b\x01\0\0\0\0\0\0\x18\
-\x60\0\0\0\0\0\0\0\0\0\0\x28\x14\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x50\x17\0\0\
-\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x30\x14\0\0\x18\x61\0\0\0\0\0\
-\0\0\0\0\0\x60\x17\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xd0\x15\
-\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x80\x17\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\
-\0\0\0\0\0\0\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x78\x17\0\0\x7b\x01\0\0\0\0\
-\0\0\x61\x60\x08\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x18\x17\0\0\x63\x01\0\0\
-\0\0\0\0\x61\x60\x0c\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x1c\x17\0\0\x63\x01\
-\0\0\0\0\0\0\x79\x60\x10\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x20\x17\0\0\x7b\
-\x01\0\0\0\0\0\0\x61\xa0\x78\xff\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x48\x17\0\
-\0\x63\x01\0\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x90\x17\0\0\xb7\x02\0\0\x12\
+\0\0\x63\x7a\x80\xff\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x20\x12\0\0\x18\x61\0\
+\0\0\0\0\0\0\0\0\0\x30\x17\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\
+\x28\x12\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x28\x17\0\0\x7b\x01\0\0\0\0\0\0\x18\
+\x60\0\0\0\0\0\0\0\0\0\0\x38\x14\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x70\x17\0\0\
+\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x40\x14\0\0\x18\x61\0\0\0\0\0\
+\0\0\0\0\0\x80\x17\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xf0\x15\
+\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xa0\x17\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x98\x17\0\0\x7b\x01\0\0\0\0\
+\0\0\x61\x60\x08\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x38\x17\0\0\x63\x01\0\0\
+\0\0\0\0\x61\x60\x0c\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x3c\x17\0\0\x63\x01\
+\0\0\0\0\0\0\x79\x60\x10\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x40\x17\0\0\x7b\
+\x01\0\0\0\0\0\0\x61\xa0\x78\xff\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x68\x17\0\
+\0\x63\x01\0\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xb0\x17\0\0\xb7\x02\0\0\x12\
 \0\0\0\xb7\x03\0\0\x0c\0\0\0\xb7\x04\0\0\0\0\0\0\x85\0\0\0\xa7\0\0\0\xbf\x07\0\
-\0\0\0\0\0\xc5\x07\x13\xff\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\0\x17\0\0\x63\
+\0\0\0\0\0\xc5\x07\x13\xff\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x20\x17\0\0\x63\
 \x70\x6c\0\0\0\0\0\x77\x07\0\0\x20\0\0\0\x63\x70\x70\0\0\0\0\0\xb7\x01\0\0\x05\
-\0\0\0\x18\x62\0\0\0\0\0\0\0\0\0\0\0\x17\0\0\xb7\x03\0\0\x8c\0\0\0\x85\0\0\0\
-\xa6\0\0\0\xbf\x07\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x70\x17\0\0\x61\x01\
+\0\0\0\x18\x62\0\0\0\0\0\0\0\0\0\0\x20\x17\0\0\xb7\x03\0\0\x8c\0\0\0\x85\0\0\0\
+\xa6\0\0\0\xbf\x07\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x90\x17\0\0\x61\x01\
 \0\0\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\xc5\
 \x07\x01\xff\0\0\0\0\x63\x7a\x84\xff\0\0\0\0\x61\xa1\x78\xff\0\0\0\0\xd5\x01\
 \x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\x61\xa0\x80\xff\0\0\0\0\
@@ -422,4 +423,19 @@  iterators_bpf__open_and_load(void)
 	return skel;
 }
 
+__attribute__((unused)) static void
+iterators_bpf__assert(struct iterators_bpf *s)
+{
+#ifdef __cplusplus
+#define _Static_assert static_assert
+#endif
+#ifdef __cplusplus
+#undef _Static_assert
+#endif
+}
+
+static struct bpf_link *dump_bpf_map_link;
+static struct bpf_link *dump_bpf_prog_link;
+static struct iterators_bpf *skel;
+
 #endif /* __ITERATORS_BPF_SKEL_H__ */
diff --git a/tools/bpf/bpftool/Documentation/bpftool-gen.rst b/tools/bpf/bpftool/Documentation/bpftool-gen.rst
index 68454ef28f58..74bbefa28212 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-gen.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-gen.rst
@@ -208,6 +208,11 @@  OPTIONS
 		  not use the majority of the libbpf infrastructure, and does not need
 		  libelf.
 
+	-P, --gen-preload-methods
+		  For light skeletons, generate the static variables and the methods
+		  required to preload an eBPF program and pin its objects to the bpf
+		  filesystem.
+
 EXAMPLES
 ========
 **$ cat example1.bpf.c**
diff --git a/tools/bpf/bpftool/bash-completion/bpftool b/tools/bpf/bpftool/bash-completion/bpftool
index 5df8d72c5179..6e433e86fb26 100644
--- a/tools/bpf/bpftool/bash-completion/bpftool
+++ b/tools/bpf/bpftool/bash-completion/bpftool
@@ -261,7 +261,7 @@  _bpftool()
     # Deal with options
     if [[ ${words[cword]} == -* ]]; then
         local c='--version --json --pretty --bpffs --mapcompat --debug \
-	       --use-loader --base-btf --legacy'
+	       --use-loader --gen-preload-methods --base-btf --legacy'
         COMPREPLY=( $( compgen -W "$c" -- "$cur" ) )
         return 0
     fi
diff --git a/tools/bpf/bpftool/gen.c b/tools/bpf/bpftool/gen.c
index 7ba7ff55d2ea..c62c4c65b631 100644
--- a/tools/bpf/bpftool/gen.c
+++ b/tools/bpf/bpftool/gen.c
@@ -652,6 +652,28 @@  static void codegen_destroy(struct bpf_object *obj, const char *obj_name)
 		obj_name);
 }
 
+static void codegen_preload_vars(struct bpf_object *obj, const char *obj_name)
+{
+	struct bpf_program *prog;
+
+	codegen("\
+		\n\
+		\n\
+		");
+
+	bpf_object__for_each_program(prog, obj) {
+		codegen("\
+			\n\
+			static struct bpf_link *%s_link;		    \n\
+			", bpf_program__name(prog));
+	}
+
+	codegen("\
+		\n\
+		static struct %s *skel;					    \n\
+		", obj_name);
+}
+
 static int gen_trace(struct bpf_object *obj, const char *obj_name, const char *header_guard)
 {
 	DECLARE_LIBBPF_OPTS(gen_loader_opts, opts);
@@ -800,6 +822,10 @@  static int gen_trace(struct bpf_object *obj, const char *obj_name, const char *h
 
 	codegen_asserts(obj, obj_name);
 
+	if (gen_preload_methods) {
+		codegen_preload_vars(obj, obj_name);
+	}
+
 	codegen("\
 		\n\
 									    \n\
@@ -1615,6 +1641,7 @@  static int do_help(int argc, char **argv)
 		"\n"
 		"       " HELP_SPEC_OPTIONS " |\n"
 		"                    {-L|--use-loader} }\n"
+		"                    {-P|--gen-preload-methods} }\n"
 		"",
 		bin_name, "gen");
 
diff --git a/tools/bpf/bpftool/main.c b/tools/bpf/bpftool/main.c
index e81227761f5d..5d5dae6215a3 100644
--- a/tools/bpf/bpftool/main.c
+++ b/tools/bpf/bpftool/main.c
@@ -31,6 +31,7 @@  bool block_mount;
 bool verifier_logs;
 bool relaxed_maps;
 bool use_loader;
+bool gen_preload_methods;
 bool legacy_libbpf;
 struct btf *base_btf;
 struct hashmap *refs_table;
@@ -426,6 +427,7 @@  int main(int argc, char **argv)
 		{ "nomount",	no_argument,	NULL,	'n' },
 		{ "debug",	no_argument,	NULL,	'd' },
 		{ "use-loader",	no_argument,	NULL,	'L' },
+		{ "gen-preload-methods",	no_argument,	NULL,	'P' },
 		{ "base-btf",	required_argument, NULL, 'B' },
 		{ "legacy",	no_argument,	NULL,	'l' },
 		{ 0 }
@@ -443,7 +445,7 @@  int main(int argc, char **argv)
 	bin_name = argv[0];
 
 	opterr = 0;
-	while ((opt = getopt_long(argc, argv, "VhpjfLmndB:l",
+	while ((opt = getopt_long(argc, argv, "VhpjfLmndB:lP",
 				  options, NULL)) >= 0) {
 		switch (opt) {
 		case 'V':
@@ -493,6 +495,9 @@  int main(int argc, char **argv)
 		case 'l':
 			legacy_libbpf = true;
 			break;
+		case 'P':
+			gen_preload_methods = true;
+			break;
 		default:
 			p_err("unrecognized option '%s'", argv[optind - 1]);
 			if (json_output)
diff --git a/tools/bpf/bpftool/main.h b/tools/bpf/bpftool/main.h
index 6e9277ffc68c..9485b354a084 100644
--- a/tools/bpf/bpftool/main.h
+++ b/tools/bpf/bpftool/main.h
@@ -90,6 +90,7 @@  extern bool block_mount;
 extern bool verifier_logs;
 extern bool relaxed_maps;
 extern bool use_loader;
+extern bool gen_preload_methods;
 extern bool legacy_libbpf;
 extern struct btf *base_btf;
 extern struct hashmap *refs_table;