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Message-Id: <20220518225531.558008-10-sdf@google.com>
Date: Wed, 18 May 2022 15:55:29 -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 v7 09/11] 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 | 77 +++++++++++++++++++++++++++-----------
tools/bpf/bpftool/common.c | 1 +
2 files changed, 56 insertions(+), 22 deletions(-)
diff --git a/tools/bpf/bpftool/cgroup.c b/tools/bpf/bpftool/cgroup.c
index effe136119d7..23e2d8a21e28 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"
@@ -32,6 +33,7 @@
" sock_release }"
static unsigned int query_flags;
+static struct btf *btf_vmlinux;
static enum bpf_attach_type parse_attach_type(const char *str)
{
@@ -51,6 +53,7 @@ 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 = {};
__u32 info_len = sizeof(info);
int prog_fd;
@@ -64,6 +67,18 @@ static int show_bpf_prog(int id, enum bpf_attach_type attach_type,
return -1;
}
+ if (btf_vmlinux &&
+ info.attach_btf_func_id < btf__type_cnt(btf_vmlinux)) {
+ /* Note, we ignore info.btf_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_func_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);
@@ -76,6 +91,10 @@ 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, "btf_id", info.btf_id);
+ jsonw_uint_field(json_wtr, "attach_btf_func_id", info.attach_btf_func_id);
jsonw_end_object(json_wtr);
} else {
printf("%s%-8u ", level ? " " : "", info.id);
@@ -83,7 +102,12 @@ static int show_bpf_prog(int id, enum bpf_attach_type attach_type,
printf("%-15s", attach_type_name[attach_type]);
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_func_id)
+ printf(" btf_id=%d btf_func_id=%d", info.btf_id, info.attach_btf_func_id);
+ printf("\n");
}
close(prog_fd);
@@ -125,40 +149,48 @@ 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);
const char *attach_flags_str;
__u32 prog_ids[1024] = {0};
- __u32 prog_cnt, iter;
- __u32 attach_flags;
+ __u32 attach_prog_flags[1024] = {0};
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;
+
+ 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 = attach_prog_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;
}
@@ -523,5 +555,6 @@ 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);
}
diff --git a/tools/bpf/bpftool/common.c b/tools/bpf/bpftool/common.c
index c740142c24d8..a7a913784c47 100644
--- a/tools/bpf/bpftool/common.c
+++ b/tools/bpf/bpftool/common.c
@@ -66,6 +66,7 @@ const char * const attach_type_name[__MAX_BPF_ATTACH_TYPE] = {
[BPF_TRACE_FEXIT] = "fexit",
[BPF_MODIFY_RETURN] = "mod_ret",
[BPF_LSM_MAC] = "lsm_mac",
+ [BPF_LSM_CGROUP] = "lsm_cgroup",
[BPF_SK_LOOKUP] = "sk_lookup",
[BPF_TRACE_ITER] = "trace_iter",
[BPF_XDP_DEVMAP] = "xdp_devmap",
--
2.36.1.124.g0e6072fb45-goog
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