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Message-Id: <20220610165803.2860154-10-sdf@google.com>
Date: Fri, 10 Jun 2022 09:58:02 -0700
From: Stanislav Fomichev <sdf@...gle.com>
To: netdev@...r.kernel.org, bpf@...r.kernel.org
Cc: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
Stanislav Fomichev <sdf@...gle.com>
Subject: [PATCH bpf-next v9 09/10] bpftool: implement cgroup tree for BPF_LSM_CGROUP
$ bpftool --nomount prog loadall $KDIR/tools/testing/selftests/bpf/lsm_cgroup.o /sys/fs/bpf/x
$ bpftool cgroup attach /sys/fs/cgroup lsm_cgroup pinned /sys/fs/bpf/x/socket_alloc
$ bpftool cgroup attach /sys/fs/cgroup lsm_cgroup pinned /sys/fs/bpf/x/socket_bind
$ bpftool cgroup attach /sys/fs/cgroup lsm_cgroup pinned /sys/fs/bpf/x/socket_clone
$ bpftool cgroup attach /sys/fs/cgroup lsm_cgroup pinned /sys/fs/bpf/x/socket_post_create
$ bpftool cgroup tree
CgroupPath
ID AttachType AttachFlags Name
/sys/fs/cgroup
6 lsm_cgroup socket_post_create bpf_lsm_socket_post_create
8 lsm_cgroup socket_bind bpf_lsm_socket_bind
10 lsm_cgroup socket_alloc bpf_lsm_sk_alloc_security
11 lsm_cgroup socket_clone bpf_lsm_inet_csk_clone
$ bpftool cgroup detach /sys/fs/cgroup lsm_cgroup pinned /sys/fs/bpf/x/socket_post_create
$ bpftool cgroup tree
CgroupPath
ID AttachType AttachFlags Name
/sys/fs/cgroup
8 lsm_cgroup socket_bind bpf_lsm_socket_bind
10 lsm_cgroup socket_alloc bpf_lsm_sk_alloc_security
11 lsm_cgroup socket_clone bpf_lsm_inet_csk_clone
Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
---
tools/bpf/bpftool/cgroup.c | 80 +++++++++++++++++++++++++++-----------
1 file changed, 58 insertions(+), 22 deletions(-)
diff --git a/tools/bpf/bpftool/cgroup.c b/tools/bpf/bpftool/cgroup.c
index 42421fe47a58..6e55f583a62f 100644
--- a/tools/bpf/bpftool/cgroup.c
+++ b/tools/bpf/bpftool/cgroup.c
@@ -15,6 +15,7 @@
#include <unistd.h>
#include <bpf/bpf.h>
+#include <bpf/btf.h>
#include "main.h"
@@ -36,6 +37,7 @@
" cgroup_inet_sock_release }"
static unsigned int query_flags;
+static struct btf *btf_vmlinux;
static enum bpf_attach_type parse_attach_type(const char *str)
{
@@ -69,6 +71,7 @@ static int show_bpf_prog(int id, enum bpf_attach_type attach_type,
int level)
{
char prog_name[MAX_PROG_FULL_NAME];
+ const char *attach_btf_name = NULL;
struct bpf_prog_info info = {};
const char *attach_type_str;
__u32 info_len = sizeof(info);
@@ -84,6 +87,19 @@ static int show_bpf_prog(int id, enum bpf_attach_type attach_type,
}
attach_type_str = libbpf_bpf_attach_type_str(attach_type);
+
+ if (btf_vmlinux &&
+ info.attach_btf_id < btf__type_cnt(btf_vmlinux)) {
+ /* Note, we ignore info.attach_btf_obj_id for now. There
+ * is no good way to resolve btf_id to vmlinux
+ * or module btf.
+ */
+ const struct btf_type *t = btf__type_by_id(btf_vmlinux,
+ info.attach_btf_id);
+ attach_btf_name = btf__name_by_offset(btf_vmlinux,
+ t->name_off);
+ }
+
get_prog_full_name(&info, prog_fd, prog_name, sizeof(prog_name));
if (json_output) {
jsonw_start_object(json_wtr);
@@ -95,6 +111,10 @@ static int show_bpf_prog(int id, enum bpf_attach_type attach_type,
jsonw_string_field(json_wtr, "attach_flags",
attach_flags_str);
jsonw_string_field(json_wtr, "name", prog_name);
+ if (attach_btf_name)
+ jsonw_string_field(json_wtr, "attach_btf_name", attach_btf_name);
+ jsonw_uint_field(json_wtr, "attach_btf_obj_id", info.attach_btf_obj_id);
+ jsonw_uint_field(json_wtr, "attach_btf_id", info.attach_btf_id);
jsonw_end_object(json_wtr);
} else {
printf("%s%-8u ", level ? " " : "", info.id);
@@ -102,7 +122,13 @@ static int show_bpf_prog(int id, enum bpf_attach_type attach_type,
printf("%-15s", attach_type_str);
else
printf("type %-10u", attach_type);
- printf(" %-15s %-15s\n", attach_flags_str, prog_name);
+ printf(" %-15s %-15s", attach_flags_str, prog_name);
+ if (attach_btf_name)
+ printf(" %-15s", attach_btf_name);
+ else if (info.attach_btf_id)
+ printf(" attach_btf_obj_id=%d attach_btf_id=%d",
+ info.attach_btf_obj_id, info.attach_btf_id);
+ printf("\n");
}
close(prog_fd);
@@ -144,40 +170,49 @@ static int cgroup_has_attached_progs(int cgroup_fd)
static int show_attached_bpf_progs(int cgroup_fd, enum bpf_attach_type type,
int level)
{
+ LIBBPF_OPTS(bpf_prog_query_opts, p);
+ __u32 prog_attach_flags[1024] = {0};
const char *attach_flags_str;
__u32 prog_ids[1024] = {0};
- __u32 prog_cnt, iter;
- __u32 attach_flags;
char buf[32];
+ __u32 iter;
int ret;
- prog_cnt = ARRAY_SIZE(prog_ids);
- ret = bpf_prog_query(cgroup_fd, type, query_flags, &attach_flags,
- prog_ids, &prog_cnt);
+ p.query_flags = query_flags;
+ p.prog_cnt = ARRAY_SIZE(prog_ids);
+ p.prog_ids = prog_ids;
+ p.prog_attach_flags = prog_attach_flags;
+
+ ret = bpf_prog_query_opts(cgroup_fd, type, &p);
if (ret)
return ret;
- if (prog_cnt == 0)
+ if (p.prog_cnt == 0)
return 0;
- switch (attach_flags) {
- case BPF_F_ALLOW_MULTI:
- attach_flags_str = "multi";
- break;
- case BPF_F_ALLOW_OVERRIDE:
- attach_flags_str = "override";
- break;
- case 0:
- attach_flags_str = "";
- break;
- default:
- snprintf(buf, sizeof(buf), "unknown(%x)", attach_flags);
- attach_flags_str = buf;
- }
+ for (iter = 0; iter < p.prog_cnt; iter++) {
+ __u32 attach_flags;
+
+ attach_flags = prog_attach_flags[iter] ?: p.attach_flags;
+
+ switch (attach_flags) {
+ case BPF_F_ALLOW_MULTI:
+ attach_flags_str = "multi";
+ break;
+ case BPF_F_ALLOW_OVERRIDE:
+ attach_flags_str = "override";
+ break;
+ case 0:
+ attach_flags_str = "";
+ break;
+ default:
+ snprintf(buf, sizeof(buf), "unknown(%x)", attach_flags);
+ attach_flags_str = buf;
+ }
- for (iter = 0; iter < prog_cnt; iter++)
show_bpf_prog(prog_ids[iter], type,
attach_flags_str, level);
+ }
return 0;
}
@@ -542,5 +577,6 @@ static const struct cmd cmds[] = {
int do_cgroup(int argc, char **argv)
{
+ btf_vmlinux = libbpf_find_kernel_btf();
return cmd_select(cmds, argc, argv, do_help);
}
--
2.36.1.476.g0c4daa206d-goog
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