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authorHangbin Liu <liuhangbin@gmail.com>2022-08-13 08:09:36 +0800
committerAndrii Nakryiko <andrii@kernel.org>2022-08-15 14:58:20 -0700
commit1f235777c3a4ab115162fe7d45b82be534b9ae2e (patch)
tree196acb4b85b5a7cd2ba7f4e70e746b0f4e79f655 /tools/lib
parent8308bf207ce6963adb42791cfb260dc6552b6665 (diff)
libbpf: Making bpf_prog_load() ignore name if kernel doesn't support
Similar with commit 10b62d6a38f7 ("libbpf: Add names for auxiliary maps"), let's make bpf_prog_load() also ignore name if kernel doesn't support program name. To achieve this, we need to call sys_bpf_prog_load() directly in probe_kern_prog_name() to avoid circular dependency. sys_bpf_prog_load() also need to be exported in the libbpf_internal.h file. Signed-off-by: Hangbin Liu <liuhangbin@gmail.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Quentin Monnet <quentin@isovalent.com> Link: https://lore.kernel.org/bpf/20220813000936.6464-1-liuhangbin@gmail.com
Diffstat (limited to 'tools/lib')
-rw-r--r--tools/lib/bpf/bpf.c6
-rw-r--r--tools/lib/bpf/libbpf.c13
-rw-r--r--tools/lib/bpf/libbpf_internal.h3
3 files changed, 16 insertions, 6 deletions
diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index 6a96e665dc5d..575867d69496 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -84,9 +84,7 @@ static inline int sys_bpf_fd(enum bpf_cmd cmd, union bpf_attr *attr,
return ensure_good_fd(fd);
}
-#define PROG_LOAD_ATTEMPTS 5
-
-static inline int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size, int attempts)
+int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size, int attempts)
{
int fd;
@@ -263,7 +261,7 @@ int bpf_prog_load(enum bpf_prog_type prog_type,
attr.prog_ifindex = OPTS_GET(opts, prog_ifindex, 0);
attr.kern_version = OPTS_GET(opts, kern_version, 0);
- if (prog_name)
+ if (prog_name && kernel_supports(NULL, FEAT_PROG_NAME))
libbpf_strlcpy(attr.prog_name, prog_name, sizeof(attr.prog_name));
attr.license = ptr_to_u64(license);
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 3f01f5cd8a4c..aa05a99b913d 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -4415,14 +4415,23 @@ static int probe_fd(int fd)
static int probe_kern_prog_name(void)
{
+ const size_t attr_sz = offsetofend(union bpf_attr, prog_name);
struct bpf_insn insns[] = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
};
- int ret, insn_cnt = ARRAY_SIZE(insns);
+ union bpf_attr attr;
+ int ret;
+
+ memset(&attr, 0, attr_sz);
+ attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
+ attr.license = ptr_to_u64("GPL");
+ attr.insns = ptr_to_u64(insns);
+ attr.insn_cnt = (__u32)ARRAY_SIZE(insns);
+ libbpf_strlcpy(attr.prog_name, "libbpf_nametest", sizeof(attr.prog_name));
/* make sure loading with name works */
- ret = bpf_prog_load(BPF_PROG_TYPE_SOCKET_FILTER, "test", "GPL", insns, insn_cnt, NULL);
+ ret = sys_bpf_prog_load(&attr, attr_sz, PROG_LOAD_ATTEMPTS);
return probe_fd(ret);
}
diff --git a/tools/lib/bpf/libbpf_internal.h b/tools/lib/bpf/libbpf_internal.h
index 4135ae0a2bc3..377642ff51fc 100644
--- a/tools/lib/bpf/libbpf_internal.h
+++ b/tools/lib/bpf/libbpf_internal.h
@@ -573,4 +573,7 @@ static inline bool is_pow_of_2(size_t x)
return x && (x & (x - 1)) == 0;
}
+#define PROG_LOAD_ATTEMPTS 5
+int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size, int attempts);
+
#endif /* __LIBBPF_LIBBPF_INTERNAL_H */