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Merge branch 'bpftool-flow-dissector'

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Stanislav Fomichev says:

====================
v5 changes:
* FILE -> PATH for load/loadall (can be either file or directory now)
* simpler implementation for __bpf_program__pin_name
* removed p_err for REQ_ARGS checks
* parse_atach_detach_args -> parse_attach_detach_args
* for -> while in bpf_object__pin_{programs,maps} recovery

v4 changes:
* addressed another round of comments/style issues from Jakub Kicinski &
  Quentin Monnet (thanks!)
* implemented bpf_object__pin_maps and bpf_object__pin_programs helpers and
  used them in bpf_program__pin
* added new pin_name to bpf_program so bpf_program__pin
  works with sections that contain '/'
* moved *loadall* command implementation into a separate patch
* added patch that implements *pinmaps* to pin maps when doing
  load/loadall

v3 changes:
* (maybe) better cleanup for partial failure in bpf_object__pin
* added special case in bpf_program__pin for programs with single
  instances

v2 changes:
* addressed comments/style issues from Jakub Kicinski & Quentin Monnet
* removed logic that populates jump table
* added cleanup for partial failure in bpf_object__pin

This patch series adds support for loading and attaching flow dissector
programs from the bpftool:

* first patch fixes flow dissector section name in the selftests (so
  libbpf auto-detection works)
* second patch adds proper cleanup to bpf_object__pin, parts of which are now
  being used to attach all flow dissector progs/maps
* third patch adds special case in bpf_program__pin for programs with
  single instances (we don't create <prog>/0 pin anymore, just <prog>)
* forth patch adds pin_name to the bpf_program struct
  which is now used as a pin name in bpf_program__pin et al
* fifth patch adds *loadall* command that pins all programs, not just
  the first one
* sixth patch adds *pinmaps* argument to load/loadall to let users pin
  all maps of the obj file
* seventh patch adds actual flow_dissector support to the bpftool and
  an example
====================

Acked-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Alexei Starovoitov 2018-11-10 15:56:11 -08:00
commit f2cbf95826
9 changed files with 540 additions and 125 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
tools/bpf/bpftool/Documentation/bpftool-prog.rst
View File

@ -15,7 +15,8 @@ SYNOPSIS
*OPTIONS* := { { **-j** | **--json** } [{ **-p** | **--pretty** }] | { **-f** | **--bpffs** } }
*COMMANDS* :=
{ **show** | **list** | **dump xlated** | **dump jited** | **pin** | **load** | **help** }
{ **show** | **list** | **dump xlated** | **dump jited** | **pin** | **load**
| **loadall** | **help** }
MAP COMMANDS
=============
@ -24,9 +25,9 @@ MAP COMMANDS
| **bpftool** **prog dump xlated** *PROG* [{**file** *FILE* | **opcodes** | **visual**}]
| **bpftool** **prog dump jited** *PROG* [{**file** *FILE* | **opcodes**}]
| **bpftool** **prog pin** *PROG* *FILE*
| **bpftool** **prog load** *OBJ* *FILE* [**type** *TYPE*] [**map** {**idx** *IDX* | **name** *NAME*} *MAP*] [**dev** *NAME*]
| **bpftool** **prog attach** *PROG* *ATTACH_TYPE* *MAP*
| **bpftool** **prog detach** *PROG* *ATTACH_TYPE* *MAP*
| **bpftool** **prog { load | loadall }** *OBJ* *PATH* [**type** *TYPE*] [**map** {**idx** *IDX* | **name** *NAME*} *MAP*] [**dev** *NAME*]
| **bpftool** **prog attach** *PROG* *ATTACH_TYPE* [*MAP*]
| **bpftool** **prog detach** *PROG* *ATTACH_TYPE* [*MAP*]
| **bpftool** **prog help**
|
| *MAP* := { **id** *MAP_ID* | **pinned** *FILE* }
@ -39,7 +40,9 @@ MAP COMMANDS
| **cgroup/bind4** | **cgroup/bind6** | **cgroup/post_bind4** | **cgroup/post_bind6** |
| **cgroup/connect4** | **cgroup/connect6** | **cgroup/sendmsg4** | **cgroup/sendmsg6**
| }
| *ATTACH_TYPE* := { **msg_verdict** | **skb_verdict** | **skb_parse** }
| *ATTACH_TYPE* := {
| **msg_verdict** | **skb_verdict** | **skb_parse** | **flow_dissector**
| }
DESCRIPTION
@ -79,8 +82,11 @@ DESCRIPTION
contain a dot character ('.'), which is reserved for future
extensions of *bpffs*.
**bpftool prog load** *OBJ* *FILE* [**type** *TYPE*] [**map** {**idx** *IDX* | **name** *NAME*} *MAP*] [**dev** *NAME*]
Load bpf program from binary *OBJ* and pin as *FILE*.
**bpftool prog { load | loadall }** *OBJ* *PATH* [**type** *TYPE*] [**map** {**idx** *IDX* | **name** *NAME*} *MAP*] [**dev** *NAME*] [**pinmaps** *MAP_DIR*]
Load bpf program(s) from binary *OBJ* and pin as *PATH*.
**bpftool prog load** pins only the first program from the
*OBJ* as *PATH*. **bpftool prog loadall** pins all programs
from the *OBJ* under *PATH* directory.
**type** is optional, if not specified program type will be
inferred from section names.
By default bpftool will create new maps as declared in the ELF
@ -92,18 +98,24 @@ DESCRIPTION
use, referring to it by **id** or through a **pinned** file.
If **dev** *NAME* is specified program will be loaded onto
given networking device (offload).
Optional **pinmaps** argument can be provided to pin all
maps under *MAP_DIR* directory.
Note: *FILE* must be located in *bpffs* mount. It must not
Note: *PATH* must be located in *bpffs* mount. It must not
contain a dot character ('.'), which is reserved for future
extensions of *bpffs*.
**bpftool prog attach** *PROG* *ATTACH_TYPE* *MAP*
Attach bpf program *PROG* (with type specified by *ATTACH_TYPE*)
to the map *MAP*.
**bpftool prog attach** *PROG* *ATTACH_TYPE* [*MAP*]
Attach bpf program *PROG* (with type specified by
*ATTACH_TYPE*). Most *ATTACH_TYPEs* require a *MAP*
parameter, with the exception of *flow_dissector* which is
attached to current networking name space.
**bpftool prog detach** *PROG* *ATTACH_TYPE* *MAP*
Detach bpf program *PROG* (with type specified by *ATTACH_TYPE*)
from the map *MAP*.
**bpftool prog detach** *PROG* *ATTACH_TYPE* [*MAP*]
Detach bpf program *PROG* (with type specified by
*ATTACH_TYPE*). Most *ATTACH_TYPEs* require a *MAP*
parameter, with the exception of *flow_dissector* which is
detached from the current networking name space.
**bpftool prog help**
Print short help message.

21
tools/bpf/bpftool/bash-completion/bpftool
View File

@ -243,7 +243,7 @@ _bpftool()
# Completion depends on object and command in use
case $object in
prog)
if [[ $command != "load" ]]; then
if [[ $command != "load" && $command != "loadall" ]]; then
case $prev in
id)
_bpftool_get_prog_ids
@ -299,7 +299,8 @@ _bpftool()
fi
if [[ ${#words[@]} == 6 ]]; then
COMPREPLY=( $( compgen -W "msg_verdict skb_verdict skb_parse" -- "$cur" ) )
COMPREPLY=( $( compgen -W "msg_verdict skb_verdict \
skb_parse flow_dissector" -- "$cur" ) )
return 0
fi
@ -309,7 +310,7 @@ _bpftool()
fi
return 0
;;
load)
load|loadall)
local obj
if [[ ${#words[@]} -lt 6 ]]; then
@ -338,7 +339,16 @@ _bpftool()
case $prev in
type)
COMPREPLY=( $( compgen -W "socket kprobe kretprobe classifier action tracepoint raw_tracepoint xdp perf_event cgroup/skb cgroup/sock cgroup/dev lwt_in lwt_out lwt_xmit lwt_seg6local sockops sk_skb sk_msg lirc_mode2 cgroup/bind4 cgroup/bind6 cgroup/connect4 cgroup/connect6 cgroup/sendmsg4 cgroup/sendmsg6 cgroup/post_bind4 cgroup/post_bind6" -- \
COMPREPLY=( $( compgen -W "socket kprobe \
kretprobe classifier flow_dissector \
action tracepoint raw_tracepoint \
xdp perf_event cgroup/skb cgroup/sock \
cgroup/dev lwt_in lwt_out lwt_xmit \
lwt_seg6local sockops sk_skb sk_msg \
lirc_mode2 cgroup/bind4 cgroup/bind6 \
cgroup/connect4 cgroup/connect6 \
cgroup/sendmsg4 cgroup/sendmsg6 \
cgroup/post_bind4 cgroup/post_bind6" -- \
"$cur" ) )
return 0
;;
@ -346,7 +356,7 @@ _bpftool()
_bpftool_get_map_ids
return 0
;;
pinned)
pinned|pinmaps)
_filedir
return 0
;;
@ -358,6 +368,7 @@ _bpftool()
COMPREPLY=( $( compgen -W "map" -- "$cur" ) )
_bpftool_once_attr 'type'
_bpftool_once_attr 'dev'
_bpftool_once_attr 'pinmaps'
return 0
;;
esac

31
tools/bpf/bpftool/common.c
View File

@ -177,34 +177,23 @@ int open_obj_pinned_any(char *path, enum bpf_obj_type exp_type)
return fd;
}
int do_pin_fd(int fd, const char *name)
int mount_bpffs_for_pin(const char *name)
{
char err_str[ERR_MAX_LEN];
char *file;
char *dir;
int err = 0;
err = bpf_obj_pin(fd, name);
if (!err)
goto out;
file = malloc(strlen(name) + 1);
strcpy(file, name);
dir = dirname(file);
if (errno != EPERM || is_bpffs(dir)) {
p_err("can't pin the object (%s): %s", name, strerror(errno));
if (is_bpffs(dir))
/* nothing to do if already mounted */
goto out_free;
}
/* Attempt to mount bpffs, then retry pinning. */
err = mnt_bpffs(dir, err_str, ERR_MAX_LEN);
if (!err) {
err = bpf_obj_pin(fd, name);
if (err)
p_err("can't pin the object (%s): %s", name,
strerror(errno));
} else {
if (err) {
err_str[ERR_MAX_LEN - 1] = '\0';
p_err("can't mount BPF file system to pin the object (%s): %s",
name, err_str);
@ -212,10 +201,20 @@ int do_pin_fd(int fd, const char *name)
out_free:
free(file);
out:
return err;
}
int do_pin_fd(int fd, const char *name)
{
int err;
err = mount_bpffs_for_pin(name);
if (err)
return err;
return bpf_obj_pin(fd, name);
}
int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(__u32))
{
unsigned int id;

1
tools/bpf/bpftool/main.h
View File

@ -131,6 +131,7 @@ const char *get_fd_type_name(enum bpf_obj_type type);
char *get_fdinfo(int fd, const char *key);
int open_obj_pinned(char *path);
int open_obj_pinned_any(char *path, enum bpf_obj_type exp_type);
int mount_bpffs_for_pin(const char *name);
int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(__u32));
int do_pin_fd(int fd, const char *name);

191
tools/bpf/bpftool/prog.c
View File

@ -81,6 +81,7 @@ static const char * const attach_type_strings[] = {
[BPF_SK_SKB_STREAM_PARSER] = "stream_parser",
[BPF_SK_SKB_STREAM_VERDICT] = "stream_verdict",
[BPF_SK_MSG_VERDICT] = "msg_verdict",
[BPF_FLOW_DISSECTOR] = "flow_dissector",
[__MAX_BPF_ATTACH_TYPE] = NULL,
};
@ -721,30 +722,49 @@ int map_replace_compar(const void *p1, const void *p2)
return a->idx - b->idx;
}
static int parse_attach_detach_args(int argc, char **argv, int *progfd,
enum bpf_attach_type *attach_type,
int *mapfd)
{
if (!REQ_ARGS(3))
return -EINVAL;
*progfd = prog_parse_fd(&argc, &argv);
if (*progfd < 0)
return *progfd;
*attach_type = parse_attach_type(*argv);
if (*attach_type == __MAX_BPF_ATTACH_TYPE) {
p_err("invalid attach/detach type");
return -EINVAL;
}
if (*attach_type == BPF_FLOW_DISSECTOR) {
*mapfd = -1;
return 0;
}
NEXT_ARG();
if (!REQ_ARGS(2))
return -EINVAL;
*mapfd = map_parse_fd(&argc, &argv);
if (*mapfd < 0)
return *mapfd;
return 0;
}
static int do_attach(int argc, char **argv)
{
enum bpf_attach_type attach_type;
int err, mapfd, progfd;
int err, progfd;
int mapfd;
if (!REQ_ARGS(5)) {
p_err("too few parameters for map attach");
return -EINVAL;
}
progfd = prog_parse_fd(&argc, &argv);
if (progfd < 0)
return progfd;
attach_type = parse_attach_type(*argv);
if (attach_type == __MAX_BPF_ATTACH_TYPE) {
p_err("invalid attach type");
return -EINVAL;
}
NEXT_ARG();
mapfd = map_parse_fd(&argc, &argv);
if (mapfd < 0)
return mapfd;
err = parse_attach_detach_args(argc, argv,
&progfd, &attach_type, &mapfd);
if (err)
return err;
err = bpf_prog_attach(progfd, mapfd, attach_type, 0);
if (err) {
@ -760,27 +780,13 @@ static int do_attach(int argc, char **argv)
static int do_detach(int argc, char **argv)
{
enum bpf_attach_type attach_type;
int err, mapfd, progfd;
int err, progfd;
int mapfd;
if (!REQ_ARGS(5)) {
p_err("too few parameters for map detach");
return -EINVAL;
}
progfd = prog_parse_fd(&argc, &argv);
if (progfd < 0)
return progfd;
attach_type = parse_attach_type(*argv);
if (attach_type == __MAX_BPF_ATTACH_TYPE) {
p_err("invalid attach type");
return -EINVAL;
}
NEXT_ARG();
mapfd = map_parse_fd(&argc, &argv);
if (mapfd < 0)
return mapfd;
err = parse_attach_detach_args(argc, argv,
&progfd, &attach_type, &mapfd);
if (err)
return err;
err = bpf_prog_detach2(progfd, mapfd, attach_type);
if (err) {
@ -792,15 +798,17 @@ static int do_detach(int argc, char **argv)
jsonw_null(json_wtr);
return 0;
}
static int do_load(int argc, char **argv)
static int load_with_options(int argc, char **argv, bool first_prog_only)
{
enum bpf_attach_type expected_attach_type;
struct bpf_object_open_attr attr = {
.prog_type = BPF_PROG_TYPE_UNSPEC,
};
struct map_replace *map_replace = NULL;
struct bpf_program *prog = NULL, *pos;
unsigned int old_map_fds = 0;
struct bpf_program *prog;
const char *pinmaps = NULL;
struct bpf_object *obj;
struct bpf_map *map;
const char *pinfile;
@ -905,6 +913,13 @@ static int do_load(int argc, char **argv)
goto err_free_reuse_maps;
}
NEXT_ARG();
} else if (is_prefix(*argv, "pinmaps")) {
NEXT_ARG();
if (!REQ_ARGS(1))
goto err_free_reuse_maps;
pinmaps = GET_ARG();
} else {
p_err("expected no more arguments, 'type', 'map' or 'dev', got: '%s'?",
*argv);
@ -918,26 +933,25 @@ static int do_load(int argc, char **argv)
goto err_free_reuse_maps;
}
prog = bpf_program__next(NULL, obj);
if (!prog) {
p_err("object file doesn't contain any bpf program");
goto err_close_obj;
}
bpf_object__for_each_program(pos, obj) {
enum bpf_prog_type prog_type = attr.prog_type;
bpf_program__set_ifindex(prog, ifindex);
if (attr.prog_type == BPF_PROG_TYPE_UNSPEC) {
const char *sec_name = bpf_program__title(prog, false);
if (attr.prog_type == BPF_PROG_TYPE_UNSPEC) {
const char *sec_name = bpf_program__title(pos, false);
err = libbpf_prog_type_by_name(sec_name, &attr.prog_type,
&expected_attach_type);
if (err < 0) {
p_err("failed to guess program type based on section name %s\n",
sec_name);
goto err_close_obj;
err = libbpf_prog_type_by_name(sec_name, &prog_type,
&expected_attach_type);
if (err < 0) {
p_err("failed to guess program type based on section name %s\n",
sec_name);
goto err_close_obj;
}
}
bpf_program__set_ifindex(pos, ifindex);
bpf_program__set_type(pos, prog_type);
bpf_program__set_expected_attach_type(pos, expected_attach_type);
}
bpf_program__set_type(prog, attr.prog_type);
bpf_program__set_expected_attach_type(prog, expected_attach_type);
qsort(map_replace, old_map_fds, sizeof(*map_replace),
map_replace_compar);
@ -1003,9 +1017,39 @@ static int do_load(int argc, char **argv)
goto err_close_obj;
}
if (do_pin_fd(bpf_program__fd(prog), pinfile))
err = mount_bpffs_for_pin(pinfile);
if (err)
goto err_close_obj;
if (first_prog_only) {
prog = bpf_program__next(NULL, obj);
if (!prog) {
p_err("object file doesn't contain any bpf program");
goto err_close_obj;
}
err = bpf_obj_pin(bpf_program__fd(prog), pinfile);
if (err) {
p_err("failed to pin program %s",
bpf_program__title(prog, false));
goto err_close_obj;
}
} else {
err = bpf_object__pin_programs(obj, pinfile);
if (err) {
p_err("failed to pin all programs");
goto err_close_obj;
}
}
if (pinmaps) {
err = bpf_object__pin_maps(obj, pinmaps);
if (err) {
p_err("failed to pin all maps");
goto err_unpin;
}
}
if (json_output)
jsonw_null(json_wtr);
@ -1016,6 +1060,11 @@ static int do_load(int argc, char **argv)
return 0;
err_unpin:
if (first_prog_only)
unlink(pinfile);
else
bpf_object__unpin_programs(obj, pinfile);
err_close_obj:
bpf_object__close(obj);
err_free_reuse_maps:
@ -1025,6 +1074,16 @@ err_free_reuse_maps:
return -1;
}
static int do_load(int argc, char **argv)
{
return load_with_options(argc, argv, true);
}
static int do_loadall(int argc, char **argv)
{
return load_with_options(argc, argv, false);
}
static int do_help(int argc, char **argv)
{
if (json_output) {
@ -1037,10 +1096,12 @@ static int do_help(int argc, char **argv)
" %s %s dump xlated PROG [{ file FILE | opcodes | visual }]\n"
" %s %s dump jited PROG [{ file FILE | opcodes }]\n"
" %s %s pin PROG FILE\n"
" %s %s load OBJ FILE [type TYPE] [dev NAME] \\\n"
" [map { idx IDX | name NAME } MAP]\n"
" %s %s attach PROG ATTACH_TYPE MAP\n"
" %s %s detach PROG ATTACH_TYPE MAP\n"
" %s %s { load | loadall } OBJ PATH \\\n"
" [type TYPE] [dev NAME] \\\n"
" [map { idx IDX | name NAME } MAP]\\\n"
" [pinmaps MAP_DIR]\n"
" %s %s attach PROG ATTACH_TYPE [MAP]\n"
" %s %s detach PROG ATTACH_TYPE [MAP]\n"
" %s %s help\n"
"\n"
" " HELP_SPEC_MAP "\n"
@ -1052,7 +1113,8 @@ static int do_help(int argc, char **argv)
" cgroup/bind4 | cgroup/bind6 | cgroup/post_bind4 |\n"
" cgroup/post_bind6 | cgroup/connect4 | cgroup/connect6 |\n"
" cgroup/sendmsg4 | cgroup/sendmsg6 }\n"
" ATTACH_TYPE := { msg_verdict | skb_verdict | skb_parse }\n"
" ATTACH_TYPE := { msg_verdict | skb_verdict | skb_parse |\n"
" flow_dissector }\n"
" " HELP_SPEC_OPTIONS "\n"
"",
bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
@ -1069,6 +1131,7 @@ static const struct cmd cmds[] = {
{ "dump", do_dump },
{ "pin", do_pin },
{ "load", do_load },
{ "loadall", do_loadall },
{ "attach", do_attach },
{ "detach", do_detach },
{ 0 }

359
tools/lib/bpf/libbpf.c
View File

@ -124,6 +124,10 @@ struct bpf_program {
char *name;
int prog_ifindex;
char *section_name;
/* section_name with / replaced by _; makes recursive pinning
* in bpf_object__pin_programs easier
*/
char *pin_name;
struct bpf_insn *insns;
size_t insns_cnt, main_prog_cnt;
enum bpf_prog_type type;
@ -253,6 +257,7 @@ static void bpf_program__exit(struct bpf_program *prog)
bpf_program__unload(prog);
zfree(&prog->name);
zfree(&prog->section_name);
zfree(&prog->pin_name);
zfree(&prog->insns);
zfree(&prog->reloc_desc);
@ -261,6 +266,17 @@ static void bpf_program__exit(struct bpf_program *prog)
prog->idx = -1;
}
static char *__bpf_program__pin_name(struct bpf_program *prog)
{
char *name, *p;
name = p = strdup(prog->section_name);
while ((p = strchr(p, '/')))
*p = '_';
return name;
}
static int
bpf_program__init(void *data, size_t size, char *section_name, int idx,
struct bpf_program *prog)
@ -279,6 +295,13 @@ bpf_program__init(void *data, size_t size, char *section_name, int idx,
goto errout;
}
prog->pin_name = __bpf_program__pin_name(prog);
if (!prog->pin_name) {
pr_warning("failed to alloc pin name for prog under section(%d) %s\n",
idx, section_name);
goto errout;
}
prog->insns = malloc(size);
if (!prog->insns) {
pr_warning("failed to alloc insns for prog under section %s\n",
@ -1699,6 +1722,34 @@ int bpf_program__pin_instance(struct bpf_program *prog, const char *path,
return 0;
}
int bpf_program__unpin_instance(struct bpf_program *prog, const char *path,
int instance)
{
int err;
err = check_path(path);
if (err)
return err;
if (prog == NULL) {
pr_warning("invalid program pointer\n");
return -EINVAL;
}
if (instance < 0 || instance >= prog->instances.nr) {
pr_warning("invalid prog instance %d of prog %s (max %d)\n",
instance, prog->section_name, prog->instances.nr);
return -EINVAL;
}
err = unlink(path);
if (err != 0)
return -errno;
pr_debug("unpinned program '%s'\n", path);
return 0;
}
static int make_dir(const char *path)
{
char *cp, errmsg[STRERR_BUFSIZE];
@ -1733,10 +1784,78 @@ int bpf_program__pin(struct bpf_program *prog, const char *path)
return -EINVAL;
}
if (prog->instances.nr == 1) {
/* don't create subdirs when pinning single instance */
return bpf_program__pin_instance(prog, path, 0);
}
err = make_dir(path);
if (err)
return err;
for (i = 0; i < prog->instances.nr; i++) {
char buf[PATH_MAX];
int len;
len = snprintf(buf, PATH_MAX, "%s/%d", path, i);
if (len < 0) {
err = -EINVAL;
goto err_unpin;
} else if (len >= PATH_MAX) {
err = -ENAMETOOLONG;
goto err_unpin;
}
err = bpf_program__pin_instance(prog, buf, i);
if (err)
goto err_unpin;
}
return 0;
err_unpin:
for (i = i - 1; i >= 0; i--) {
char buf[PATH_MAX];
int len;
len = snprintf(buf, PATH_MAX, "%s/%d", path, i);
if (len < 0)
continue;
else if (len >= PATH_MAX)
continue;
bpf_program__unpin_instance(prog, buf, i);
}
rmdir(path);
return err;
}
int bpf_program__unpin(struct bpf_program *prog, const char *path)
{
int i, err;
err = check_path(path);
if (err)
return err;
if (prog == NULL) {
pr_warning("invalid program pointer\n");
return -EINVAL;
}
if (prog->instances.nr <= 0) {
pr_warning("no instances of prog %s to pin\n",
prog->section_name);
return -EINVAL;
}
if (prog->instances.nr == 1) {
/* don't create subdirs when pinning single instance */
return bpf_program__unpin_instance(prog, path, 0);
}
for (i = 0; i < prog->instances.nr; i++) {
char buf[PATH_MAX];
int len;
@ -1747,11 +1866,15 @@ int bpf_program__pin(struct bpf_program *prog, const char *path)
else if (len >= PATH_MAX)
return -ENAMETOOLONG;
err = bpf_program__pin_instance(prog, buf, i);
err = bpf_program__unpin_instance(prog, buf, i);
if (err)
return err;
}
err = rmdir(path);
if (err)
return -errno;
return 0;
}
@ -1776,12 +1899,33 @@ int bpf_map__pin(struct bpf_map *map, const char *path)
}
pr_debug("pinned map '%s'\n", path);
return 0;
}
int bpf_object__pin(struct bpf_object *obj, const char *path)
int bpf_map__unpin(struct bpf_map *map, const char *path)
{
int err;
err = check_path(path);
if (err)
return err;
if (map == NULL) {
pr_warning("invalid map pointer\n");
return -EINVAL;
}
err = unlink(path);
if (err != 0)
return -errno;
pr_debug("unpinned map '%s'\n", path);
return 0;
}
int bpf_object__pin_maps(struct bpf_object *obj, const char *path)
{
struct bpf_program *prog;
struct bpf_map *map;
int err;
@ -1797,6 +1941,53 @@ int bpf_object__pin(struct bpf_object *obj, const char *path)
if (err)
return err;
bpf_map__for_each(map, obj) {
char buf[PATH_MAX];
int len;
len = snprintf(buf, PATH_MAX, "%s/%s", path,
bpf_map__name(map));
if (len < 0) {
err = -EINVAL;
goto err_unpin_maps;
} else if (len >= PATH_MAX) {
err = -ENAMETOOLONG;
goto err_unpin_maps;
}
err = bpf_map__pin(map, buf);
if (err)
goto err_unpin_maps;
}
return 0;
err_unpin_maps:
while ((map = bpf_map__prev(map, obj))) {
char buf[PATH_MAX];
int len;
len = snprintf(buf, PATH_MAX, "%s/%s", path,
bpf_map__name(map));
if (len < 0)
continue;
else if (len >= PATH_MAX)
continue;
bpf_map__unpin(map, buf);
}
return err;
}
int bpf_object__unpin_maps(struct bpf_object *obj, const char *path)
{
struct bpf_map *map;
int err;
if (!obj)
return -ENOENT;
bpf_map__for_each(map, obj) {
char buf[PATH_MAX];
int len;
@ -1808,23 +1999,90 @@ int bpf_object__pin(struct bpf_object *obj, const char *path)
else if (len >= PATH_MAX)
return -ENAMETOOLONG;
err = bpf_map__pin(map, buf);
err = bpf_map__unpin(map, buf);
if (err)
return err;
}
return 0;
}
int bpf_object__pin_programs(struct bpf_object *obj, const char *path)
{
struct bpf_program *prog;
int err;
if (!obj)
return -ENOENT;
if (!obj->loaded) {
pr_warning("object not yet loaded; load it first\n");
return -ENOENT;
}
err = make_dir(path);
if (err)
return err;
bpf_object__for_each_program(prog, obj) {
char buf[PATH_MAX];
int len;
len = snprintf(buf, PATH_MAX, "%s/%s", path,
prog->section_name);
prog->pin_name);
if (len < 0) {
err = -EINVAL;
goto err_unpin_programs;
} else if (len >= PATH_MAX) {
err = -ENAMETOOLONG;
goto err_unpin_programs;
}
err = bpf_program__pin(prog, buf);
if (err)
goto err_unpin_programs;
}
return 0;
err_unpin_programs:
while ((prog = bpf_program__prev(prog, obj))) {
char buf[PATH_MAX];
int len;
len = snprintf(buf, PATH_MAX, "%s/%s", path,
prog->pin_name);
if (len < 0)
continue;
else if (len >= PATH_MAX)
continue;
bpf_program__unpin(prog, buf);
}
return err;
}
int bpf_object__unpin_programs(struct bpf_object *obj, const char *path)
{
struct bpf_program *prog;
int err;
if (!obj)
return -ENOENT;
bpf_object__for_each_program(prog, obj) {
char buf[PATH_MAX];
int len;
len = snprintf(buf, PATH_MAX, "%s/%s", path,
prog->pin_name);
if (len < 0)
return -EINVAL;
else if (len >= PATH_MAX)
return -ENAMETOOLONG;
err = bpf_program__pin(prog, buf);
err = bpf_program__unpin(prog, buf);
if (err)
return err;
}
@ -1832,6 +2090,23 @@ int bpf_object__pin(struct bpf_object *obj, const char *path)
return 0;
}
int bpf_object__pin(struct bpf_object *obj, const char *path)
{
int err;
err = bpf_object__pin_maps(obj, path);
if (err)
return err;
err = bpf_object__pin_programs(obj, path);
if (err) {
bpf_object__unpin_maps(obj, path);
return err;
}
return 0;
}
void bpf_object__close(struct bpf_object *obj)
{
size_t i;
@ -1918,23 +2193,20 @@ void *bpf_object__priv(struct bpf_object *obj)
}
static struct bpf_program *
__bpf_program__next(struct bpf_program *prev, struct bpf_object *obj)
__bpf_program__iter(struct bpf_program *p, struct bpf_object *obj, int i)
{
size_t idx;
ssize_t idx;
if (!obj->programs)
return NULL;
/* First handler */
if (prev == NULL)
return &obj->programs[0];
if (prev->obj != obj) {
if (p->obj != obj) {
pr_warning("error: program handler doesn't match object\n");
return NULL;
}
idx = (prev - obj->programs) + 1;
if (idx >= obj->nr_programs)
idx = (p - obj->programs) + i;
if (idx >= obj->nr_programs || idx < 0)
return NULL;
return &obj->programs[idx];
}
@ -1944,8 +2216,29 @@ bpf_program__next(struct bpf_program *prev, struct bpf_object *obj)
{
struct bpf_program *prog = prev;
if (prev == NULL)
return obj->programs;
do {
prog = __bpf_program__next(prog, obj);
prog = __bpf_program__iter(prog, obj, 1);
} while (prog && bpf_program__is_function_storage(prog, obj));
return prog;
}
struct bpf_program *
bpf_program__prev(struct bpf_program *next, struct bpf_object *obj)
{
struct bpf_program *prog = next;
if (next == NULL) {
if (!obj->nr_programs)
return NULL;
return obj->programs + obj->nr_programs - 1;
}
do {
prog = __bpf_program__iter(prog, obj, -1);
} while (prog && bpf_program__is_function_storage(prog, obj));
return prog;
@ -2272,10 +2565,10 @@ void bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex)
map->map_ifindex = ifindex;
}
struct bpf_map *
bpf_map__next(struct bpf_map *prev, struct bpf_object *obj)
static struct bpf_map *
__bpf_map__iter(struct bpf_map *m, struct bpf_object *obj, int i)
{
size_t idx;
ssize_t idx;
struct bpf_map *s, *e;
if (!obj || !obj->maps)
@ -2284,21 +2577,39 @@ bpf_map__next(struct bpf_map *prev, struct bpf_object *obj)
s = obj->maps;
e = obj->maps + obj->nr_maps;
if (prev == NULL)
return s;
if ((prev < s) || (prev >= e)) {
if ((m < s) || (m >= e)) {
pr_warning("error in %s: map handler doesn't belong to object\n",
__func__);
return NULL;
}
idx = (prev - obj->maps) + 1;
if (idx >= obj->nr_maps)
idx = (m - obj->maps) + i;
if (idx >= obj->nr_maps || idx < 0)
return NULL;
return &obj->maps[idx];
}
struct bpf_map *
bpf_map__next(struct bpf_map *prev, struct bpf_object *obj)
{
if (prev == NULL)
return obj->maps;
return __bpf_map__iter(prev, obj, 1);
}
struct bpf_map *
bpf_map__prev(struct bpf_map *next, struct bpf_object *obj)
{
if (next == NULL) {
if (!obj->nr_maps)
return NULL;
return obj->maps + obj->nr_maps - 1;
}
return __bpf_map__iter(next, obj, -1);
}
struct bpf_map *
bpf_object__find_map_by_name(struct bpf_object *obj, const char *name)
{

18
tools/lib/bpf/libbpf.h
View File

@ -71,6 +71,13 @@ struct bpf_object *__bpf_object__open_xattr(struct bpf_object_open_attr *attr,
LIBBPF_API struct bpf_object *bpf_object__open_buffer(void *obj_buf,
size_t obj_buf_sz,
const char *name);
LIBBPF_API int bpf_object__pin_maps(struct bpf_object *obj, const char *path);
LIBBPF_API int bpf_object__unpin_maps(struct bpf_object *obj,
const char *path);
LIBBPF_API int bpf_object__pin_programs(struct bpf_object *obj,
const char *path);
LIBBPF_API int bpf_object__unpin_programs(struct bpf_object *obj,
const char *path);
LIBBPF_API int bpf_object__pin(struct bpf_object *object, const char *path);
LIBBPF_API void bpf_object__close(struct bpf_object *object);
@ -112,6 +119,9 @@ LIBBPF_API struct bpf_program *bpf_program__next(struct bpf_program *prog,
(pos) != NULL; \
(pos) = bpf_program__next((pos), (obj)))
LIBBPF_API struct bpf_program *bpf_program__prev(struct bpf_program *prog,
struct bpf_object *obj);
typedef void (*bpf_program_clear_priv_t)(struct bpf_program *,
void *);
@ -131,7 +141,11 @@ LIBBPF_API int bpf_program__fd(struct bpf_program *prog);
LIBBPF_API int bpf_program__pin_instance(struct bpf_program *prog,
const char *path,
int instance);
LIBBPF_API int bpf_program__unpin_instance(struct bpf_program *prog,
const char *path,
int instance);
LIBBPF_API int bpf_program__pin(struct bpf_program *prog, const char *path);
LIBBPF_API int bpf_program__unpin(struct bpf_program *prog, const char *path);
LIBBPF_API void bpf_program__unload(struct bpf_program *prog);
struct bpf_insn;
@ -260,6 +274,9 @@ bpf_map__next(struct bpf_map *map, struct bpf_object *obj);
(pos) != NULL; \
(pos) = bpf_map__next((pos), (obj)))
LIBBPF_API struct bpf_map *
bpf_map__prev(struct bpf_map *map, struct bpf_object *obj);
LIBBPF_API int bpf_map__fd(struct bpf_map *map);
LIBBPF_API const struct bpf_map_def *bpf_map__def(struct bpf_map *map);
LIBBPF_API const char *bpf_map__name(struct bpf_map *map);
@ -274,6 +291,7 @@ LIBBPF_API int bpf_map__reuse_fd(struct bpf_map *map, int fd);
LIBBPF_API bool bpf_map__is_offload_neutral(struct bpf_map *map);
LIBBPF_API void bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex);
LIBBPF_API int bpf_map__pin(struct bpf_map *map, const char *path);
LIBBPF_API int bpf_map__unpin(struct bpf_map *map, const char *path);
LIBBPF_API long libbpf_get_error(const void *ptr);

2
tools/testing/selftests/bpf/bpf_flow.c
View File

@ -116,7 +116,7 @@ static __always_inline int parse_eth_proto(struct __sk_buff *skb, __be16 proto)
return BPF_DROP;
}
SEC("dissect")
SEC("flow_dissector")
int _dissect(struct __sk_buff *skb)
{
if (!skb->vlan_present)

2
tools/testing/selftests/bpf/test_flow_dissector.sh
View File

@ -59,7 +59,7 @@ else
fi
# Attach BPF program
./flow_dissector_load -p bpf_flow.o -s dissect
./flow_dissector_load -p bpf_flow.o -s flow_dissector
# Setup
tc qdisc add dev lo ingress