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authorTaeung Song <treeze.taeung@gmail.com>2019-01-21 16:06:38 +0300
committerDaniel Borkmann <daniel@iogearbox.net>2019-01-23 14:27:04 +0300
commitc76e4c228b053eb108e6c3221bef338aa2c98fac (patch)
tree97150f9540894e081f6ae2649636b5bccef58ea7 /tools/lib
parentffcf7ce9332723cab5ae55575f3a55d1ce559bf3 (diff)
downloadlinux-c76e4c228b053eb108e6c3221bef338aa2c98fac.tar.xz
libbpf: Show supported ELF section names when failing to guess prog/attach type
We need to let users check their wrong ELF section name with proper ELF section names when they fail to get a prog/attach type from it. Because users can't realize libbpf guess prog/attach types from given ELF section names. For example, when a 'cgroup' section name of a BPF program is used, show available ELF section names(types). Before: $ bpftool prog load bpf-prog.o /sys/fs/bpf/prog1 Error: failed to guess program type based on ELF section name cgroup After: libbpf: failed to guess program type based on ELF section name 'cgroup' libbpf: supported section(type) names are: socket kprobe/ kretprobe/ classifier action tracepoint/ raw_tracepoint/ xdp perf_event lwt_in lwt_out lwt_xmit lwt_seg6local cgroup_skb/ingress cgroup_skb/egress cgroup/skb cgroup/sock cgroup/post_bind4 cgroup/post_bind6 cgroup/dev sockops sk_skb/stream_parser sk_skb/stream_verdict sk_skb sk_msg lirc_mode2 flow_dissector cgroup/bind4 cgroup/bind6 cgroup/connect4 cgroup/connect6 cgroup/sendmsg4 cgroup/sendmsg6 Signed-off-by: Taeung Song <treeze.taeung@gmail.com> Cc: Quentin Monnet <quentin.monnet@netronome.com> Cc: Jakub Kicinski <jakub.kicinski@netronome.com> Cc: Andrey Ignatov <rdna@fb.com> Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com> Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'tools/lib')
-rw-r--r--tools/lib/bpf/libbpf.c46
1 files changed, 44 insertions, 2 deletions
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 169e347c76f6..2ccde17957e6 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -2667,9 +2667,38 @@ static const struct {
#undef BPF_EAPROG_SEC
#undef BPF_APROG_COMPAT
+#define MAX_TYPE_NAME_SIZE 32
+
+static char *libbpf_get_type_names(bool attach_type)
+{
+ int i, len = ARRAY_SIZE(section_names) * MAX_TYPE_NAME_SIZE;
+ char *buf;
+
+ buf = malloc(len);
+ if (!buf)
+ return NULL;
+
+ buf[0] = '\0';
+ /* Forge string buf with all available names */
+ for (i = 0; i < ARRAY_SIZE(section_names); i++) {
+ if (attach_type && !section_names[i].is_attachable)
+ continue;
+
+ if (strlen(buf) + strlen(section_names[i].sec) + 2 > len) {
+ free(buf);
+ return NULL;
+ }
+ strcat(buf, " ");
+ strcat(buf, section_names[i].sec);
+ }
+
+ return buf;
+}
+
int libbpf_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type,
enum bpf_attach_type *expected_attach_type)
{
+ char *type_names;
int i;
if (!name)
@@ -2682,12 +2711,20 @@ int libbpf_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type,
*expected_attach_type = section_names[i].expected_attach_type;
return 0;
}
+ pr_warning("failed to guess program type based on ELF section name '%s'\n", name);
+ type_names = libbpf_get_type_names(false);
+ if (type_names != NULL) {
+ pr_info("supported section(type) names are:%s\n", type_names);
+ free(type_names);
+ }
+
return -EINVAL;
}
int libbpf_attach_type_by_name(const char *name,
enum bpf_attach_type *attach_type)
{
+ char *type_names;
int i;
if (!name)
@@ -2701,6 +2738,13 @@ int libbpf_attach_type_by_name(const char *name,
*attach_type = section_names[i].attach_type;
return 0;
}
+ pr_warning("failed to guess attach type based on ELF section name '%s'\n", name);
+ type_names = libbpf_get_type_names(true);
+ if (type_names != NULL) {
+ pr_info("attachable section(type) names are:%s\n", type_names);
+ free(type_names);
+ }
+
return -EINVAL;
}
@@ -2907,8 +2951,6 @@ int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr,
err = bpf_program__identify_section(prog, &prog_type,
&expected_attach_type);
if (err < 0) {
- pr_warning("failed to guess program type based on section name %s\n",
- prog->section_name);
bpf_object__close(obj);
return -EINVAL;
}