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bpftool: Query only cgroup-related attach types

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When CONFIG_NETKIT=y,
bpftool-cgroup shows error even if the cgroup's path is correct:

$ bpftool cgroup tree /sys/fs/cgroup
CgroupPath
ID       AttachType      AttachFlags     Name
Error: can't query bpf programs attached to /sys/fs/cgroup: No such device or address

>From strace and kernel tracing, I found netkit returned ENXIO and this command failed.
I think this AttachType(BPF_NETKIT_PRIMARY) is not relevant to cgroup.

bpftool-cgroup should query just only cgroup-related attach types.

v2->v3:
  - removed an unnecessary check

v1->v2:
  - used an array of cgroup attach types

Signed-off-by: Kenta Tada <tadakentaso@gmail.com>
Reviewed-by: Quentin Monnet <qmo@kernel.org>
Link: https://lore.kernel.org/r/20240607111704.6716-1-tadakentaso@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Kenta Tada 2024-06-07 20:17:04 +09:00 committed by Alexei Starovoitov
parent bb678f0180
commit 98b303c9bf
1 changed files with 36 additions and 4 deletions
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40
tools/bpf/bpftool/cgroup.c
View File

@ -19,6 +19,38 @@
#include "main.h"
static const int cgroup_attach_types[] = {
BPF_CGROUP_INET_INGRESS,
BPF_CGROUP_INET_EGRESS,
BPF_CGROUP_INET_SOCK_CREATE,
BPF_CGROUP_INET_SOCK_RELEASE,
BPF_CGROUP_INET4_BIND,
BPF_CGROUP_INET6_BIND,
BPF_CGROUP_INET4_POST_BIND,
BPF_CGROUP_INET6_POST_BIND,
BPF_CGROUP_INET4_CONNECT,
BPF_CGROUP_INET6_CONNECT,
BPF_CGROUP_UNIX_CONNECT,
BPF_CGROUP_INET4_GETPEERNAME,
BPF_CGROUP_INET6_GETPEERNAME,
BPF_CGROUP_UNIX_GETPEERNAME,
BPF_CGROUP_INET4_GETSOCKNAME,
BPF_CGROUP_INET6_GETSOCKNAME,
BPF_CGROUP_UNIX_GETSOCKNAME,
BPF_CGROUP_UDP4_SENDMSG,
BPF_CGROUP_UDP6_SENDMSG,
BPF_CGROUP_UNIX_SENDMSG,
BPF_CGROUP_UDP4_RECVMSG,
BPF_CGROUP_UDP6_RECVMSG,
BPF_CGROUP_UNIX_RECVMSG,
BPF_CGROUP_SOCK_OPS,
BPF_CGROUP_DEVICE,
BPF_CGROUP_SYSCTL,
BPF_CGROUP_GETSOCKOPT,
BPF_CGROUP_SETSOCKOPT,
BPF_LSM_CGROUP
};
#define HELP_SPEC_ATTACH_FLAGS \
"ATTACH_FLAGS := { multi | override }"
@ -183,13 +215,13 @@ static int count_attached_bpf_progs(int cgroup_fd, enum bpf_attach_type type)
static int cgroup_has_attached_progs(int cgroup_fd)
{
enum bpf_attach_type type;
unsigned int i = 0;
bool no_prog = true;
for (type = 0; type < __MAX_BPF_ATTACH_TYPE; type++) {
int count = count_attached_bpf_progs(cgroup_fd, type);
for (i = 0; i < ARRAY_SIZE(cgroup_attach_types); i++) {
int count = count_attached_bpf_progs(cgroup_fd, cgroup_attach_types[i]);
if (count < 0 && errno != EINVAL)
if (count < 0)
return -1;
if (count > 0) {