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Diffstat (limited to 'tools/lib/bpf/libbpf_probes.c')
-rw-r--r--tools/lib/bpf/libbpf_probes.c73
1 files changed, 41 insertions, 32 deletions
diff --git a/tools/lib/bpf/libbpf_probes.c b/tools/lib/bpf/libbpf_probes.c
index a2c64a9ce1a6..5e2aa83f637a 100644
--- a/tools/lib/bpf/libbpf_probes.c
+++ b/tools/lib/bpf/libbpf_probes.c
@@ -15,6 +15,7 @@
#include "bpf.h"
#include "libbpf.h"
+#include "libbpf_internal.h"
static bool grep(const char *buffer, const char *pattern)
{
@@ -132,21 +133,43 @@ bool bpf_probe_prog_type(enum bpf_prog_type prog_type, __u32 ifindex)
return errno != EINVAL && errno != EOPNOTSUPP;
}
-static int load_btf(void)
+int libbpf__probe_raw_btf(const char *raw_types, size_t types_len,
+ const char *str_sec, size_t str_len)
{
-#define BTF_INFO_ENC(kind, kind_flag, vlen) \
- ((!!(kind_flag) << 31) | ((kind) << 24) | ((vlen) & BTF_MAX_VLEN))
-#define BTF_TYPE_ENC(name, info, size_or_type) \
- (name), (info), (size_or_type)
-#define BTF_INT_ENC(encoding, bits_offset, nr_bits) \
- ((encoding) << 24 | (bits_offset) << 16 | (nr_bits))
-#define BTF_TYPE_INT_ENC(name, encoding, bits_offset, bits, sz) \
- BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_INT, 0, 0), sz), \
- BTF_INT_ENC(encoding, bits_offset, bits)
-#define BTF_MEMBER_ENC(name, type, bits_offset) \
- (name), (type), (bits_offset)
-
- const char btf_str_sec[] = "\0bpf_spin_lock\0val\0cnt\0l";
+ struct btf_header hdr = {
+ .magic = BTF_MAGIC,
+ .version = BTF_VERSION,
+ .hdr_len = sizeof(struct btf_header),
+ .type_len = types_len,
+ .str_off = types_len,
+ .str_len = str_len,
+ };
+ int btf_fd, btf_len;
+ __u8 *raw_btf;
+
+ btf_len = hdr.hdr_len + hdr.type_len + hdr.str_len;
+ raw_btf = malloc(btf_len);
+ if (!raw_btf)
+ return -ENOMEM;
+
+ memcpy(raw_btf, &hdr, sizeof(hdr));
+ memcpy(raw_btf + hdr.hdr_len, raw_types, hdr.type_len);
+ memcpy(raw_btf + hdr.hdr_len + hdr.type_len, str_sec, hdr.str_len);
+
+ btf_fd = bpf_load_btf(raw_btf, btf_len, NULL, 0, false);
+ if (btf_fd < 0) {
+ free(raw_btf);
+ return 0;
+ }
+
+ close(btf_fd);
+ free(raw_btf);
+ return 1;
+}
+
+static int load_sk_storage_btf(void)
+{
+ const char strs[] = "\0bpf_spin_lock\0val\0cnt\0l";
/* struct bpf_spin_lock {
* int val;
* };
@@ -155,7 +178,7 @@ static int load_btf(void)
* struct bpf_spin_lock l;
* };
*/
- __u32 btf_raw_types[] = {
+ __u32 types[] = {
/* int */
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
/* struct bpf_spin_lock */ /* [2] */
@@ -166,23 +189,9 @@ static int load_btf(void)
BTF_MEMBER_ENC(19, 1, 0), /* int cnt; */
BTF_MEMBER_ENC(23, 2, 32),/* struct bpf_spin_lock l; */
};
- struct btf_header btf_hdr = {
- .magic = BTF_MAGIC,
- .version = BTF_VERSION,
- .hdr_len = sizeof(struct btf_header),
- .type_len = sizeof(btf_raw_types),
- .str_off = sizeof(btf_raw_types),
- .str_len = sizeof(btf_str_sec),
- };
- __u8 raw_btf[sizeof(struct btf_header) + sizeof(btf_raw_types) +
- sizeof(btf_str_sec)];
-
- memcpy(raw_btf, &btf_hdr, sizeof(btf_hdr));
- memcpy(raw_btf + sizeof(btf_hdr), btf_raw_types, sizeof(btf_raw_types));
- memcpy(raw_btf + sizeof(btf_hdr) + sizeof(btf_raw_types),
- btf_str_sec, sizeof(btf_str_sec));
- return bpf_load_btf(raw_btf, sizeof(raw_btf), 0, 0, 0);
+ return libbpf__probe_raw_btf((char *)types, sizeof(types),
+ strs, sizeof(strs));
}
bool bpf_probe_map_type(enum bpf_map_type map_type, __u32 ifindex)
@@ -222,7 +231,7 @@ bool bpf_probe_map_type(enum bpf_map_type map_type, __u32 ifindex)
value_size = 8;
max_entries = 0;
map_flags = BPF_F_NO_PREALLOC;
- btf_fd = load_btf();
+ btf_fd = load_sk_storage_btf();
if (btf_fd < 0)
return false;
break;