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bpftool: Match programs by name 

When working with frequently modified BPF programs, both the ID and the
tag may change.  bpftool currently doesn't provide a "stable" way to match
such programs.

This patch implements lookup by name for programs.  The show and dump
commands will return all programs with the given name, whereas other
commands will error out if several programs have the same name.

Signed-off-by: Paul Chaignon <paul.chaignon@orange.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Link: https://lore.kernel.org/bpf/b5fc1a5dcfaeb5f16fc80295cdaa606dd2d91534.1576263640.git.paul.chaignon@gmail.com
This commit is contained in:
Paul Chaignon 2019-12-13 20:10:17 +01:00 committed by Alexei Starovoitov
parent ec2025095c
commit a7d22ca2a4
5 changed files with 42 additions and 18 deletions
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2
tools/bpf/bpftool/Documentation/bpftool-map.rst
View File

@ -41,7 +41,7 @@ MAP COMMANDS
|
| *MAP* := { **id** *MAP_ID* | **pinned** *FILE* }
| *DATA* := { [**hex**] *BYTES* }
| *PROG* := { **id** *PROG_ID* | **pinned** *FILE* | **tag** *PROG_TAG* }
| *PROG* := { **id** *PROG_ID* | **pinned** *FILE* | **tag** *PROG_TAG* | **name** *PROG_NAME* }
| *VALUE* := { *DATA* | *MAP* | *PROG* }
| *UPDATE_FLAGS* := { **any** | **exist** | **noexist** }
| *TYPE* := { **hash** | **array** | **prog_array** | **perf_event_array** | **percpu_hash**

12
tools/bpf/bpftool/Documentation/bpftool-prog.rst
View File

@ -33,7 +33,7 @@ PROG COMMANDS
| **bpftool** **prog help**
|
| *MAP* := { **id** *MAP_ID* | **pinned** *FILE* }
| *PROG* := { **id** *PROG_ID* | **pinned** *FILE* | **tag** *PROG_TAG* }
| *PROG* := { **id** *PROG_ID* | **pinned** *FILE* | **tag** *PROG_TAG* | **name** *PROG_NAME* }
| *TYPE* := {
| **socket** | **kprobe** | **kretprobe** | **classifier** | **action** |
| **tracepoint** | **raw_tracepoint** | **xdp** | **perf_event** | **cgroup/skb** |
@ -55,8 +55,8 @@ DESCRIPTION
Show information about loaded programs. If *PROG* is
specified show information only about given programs,
otherwise list all programs currently loaded on the system.
In case of **tag**, *PROG* may match several programs which
will all be shown.
In case of **tag** or **name**, *PROG* may match several
programs which will all be shown.
Output will start with program ID followed by program type and
zero or more named attributes (depending on kernel version).
@ -75,9 +75,9 @@ DESCRIPTION
output in human-readable format. In this case, **opcodes**
controls if raw opcodes should be printed as well.
In case of **tag**, *PROG* may match several programs which
will all be dumped. However, if **file** or **visual** is
specified, *PROG* must match a single program.
In case of **tag** or **name**, *PROG* may match several
programs which will all be dumped. However, if **file** or
**visual** is specified, *PROG* must match a single program.
If **file** is specified, the binary image will instead be
written to *FILE*.

22
tools/bpf/bpftool/bash-completion/bpftool
View File

@ -71,6 +71,12 @@ _bpftool_get_prog_tags()
command sed -n 's/.*"tag": "\(.*\)",$/\1/p' )" -- "$cur" ) )
}
_bpftool_get_prog_names()
{
COMPREPLY+=( $( compgen -W "$( bpftool -jp prog 2>&1 | \
command sed -n 's/.*"name": "\(.*\)",$/\1/p' )" -- "$cur" ) )
}
_bpftool_get_btf_ids()
{
COMPREPLY+=( $( compgen -W "$( bpftool -jp btf 2>&1 | \
@ -201,6 +207,10 @@ _bpftool()
_bpftool_get_prog_tags
return 0
;;
name)
_bpftool_get_prog_names
return 0
;;
dev)
_sysfs_get_netdevs
return 0
@ -263,7 +273,7 @@ _bpftool()
;;
esac
local PROG_TYPE='id pinned tag'
local PROG_TYPE='id pinned tag name'
local MAP_TYPE='id pinned'
case $command in
show|list)
@ -559,7 +569,7 @@ _bpftool()
return 0
;;
prog_array)
local PROG_TYPE='id pinned tag'
local PROG_TYPE='id pinned tag name'
COMPREPLY+=( $( compgen -W "$PROG_TYPE" \
-- "$cur" ) )
return 0
@ -644,7 +654,7 @@ _bpftool()
esac
;;
btf)
local PROG_TYPE='id pinned tag'
local PROG_TYPE='id pinned tag name'
local MAP_TYPE='id pinned'
case $command in
dump)
@ -735,7 +745,7 @@ _bpftool()
connect6 sendmsg4 sendmsg6 recvmsg4 recvmsg6 sysctl \
getsockopt setsockopt'
local ATTACH_FLAGS='multi override'
local PROG_TYPE='id pinned tag'
local PROG_TYPE='id pinned tag name'
case $prev in
$command)
_filedir
@ -760,7 +770,7 @@ _bpftool()
elif [[ "$command" == "attach" ]]; then
# We have an attach type on the command line,
# but it is not the previous word, or
# "id|pinned|tag" (we already checked for
# "id|pinned|tag|name" (we already checked for
# that). This should only leave the case when
# we need attach flags for "attach" commamnd.
_bpftool_one_of_list "$ATTACH_FLAGS"
@ -786,7 +796,7 @@ _bpftool()
esac
;;
net)
local PROG_TYPE='id pinned tag'
local PROG_TYPE='id pinned tag name'
local ATTACH_TYPES='xdp xdpgeneric xdpdrv xdpoffload'
case $command in
show|list)

2
tools/bpf/bpftool/main.h
View File

@ -42,7 +42,7 @@
#define BPF_TAG_FMT "%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx"
#define HELP_SPEC_PROGRAM \
"PROG := { id PROG_ID | pinned FILE | tag PROG_TAG }"
"PROG := { id PROG_ID | pinned FILE | tag PROG_TAG | name PROG_NAME }"
#define HELP_SPEC_OPTIONS \
"OPTIONS := { {-j|--json} [{-p|--pretty}] | {-f|--bpffs} |\n" \
"\t {-m|--mapcompat} | {-n|--nomount} }"

22
tools/bpf/bpftool/prog.c
View File

@ -82,7 +82,7 @@ static void print_boot_time(__u64 nsecs, char *buf, unsigned int size)
strftime(buf, size, "%FT%T%z", &load_tm);
}
static int prog_fd_by_tag(unsigned char *tag, int **fds)
static int prog_fd_by_nametag(void *nametag, int **fds, bool tag)
{
unsigned int id = 0;
int fd, nb_fds = 0;
@ -116,7 +116,8 @@ static int prog_fd_by_tag(unsigned char *tag, int **fds)
goto err_close_fd;
}
if (memcmp(tag, info.tag, BPF_TAG_SIZE)) {
if ((tag && memcmp(nametag, info.tag, BPF_TAG_SIZE)) ||
(!tag && strncmp(nametag, info.name, BPF_OBJ_NAME_LEN))) {
close(fd);
continue;
}
@ -174,7 +175,20 @@ static int prog_parse_fds(int *argc, char ***argv, int **fds)
}
NEXT_ARGP();
return prog_fd_by_tag(tag, fds);
return prog_fd_by_nametag(tag, fds, true);
} else if (is_prefix(**argv, "name")) {
char *name;
NEXT_ARGP();
name = **argv;
if (strlen(name) > BPF_OBJ_NAME_LEN - 1) {
p_err("can't parse name");
return -1;
}
NEXT_ARGP();
return prog_fd_by_nametag(name, fds, false);
} else if (is_prefix(**argv, "pinned")) {
char *path;
@ -189,7 +203,7 @@ static int prog_parse_fds(int *argc, char ***argv, int **fds)
return 1;
}
p_err("expected 'id', 'tag' or 'pinned', got: '%s'?", **argv);
p_err("expected 'id', 'tag', 'name' or 'pinned', got: '%s'?", **argv);
return -1;
}