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1006 lines
22 KiB
1006 lines
22 KiB
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
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/* Copyright (C) 2019 Facebook */ |
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#include <errno.h> |
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#include <fcntl.h> |
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#include <linux/err.h> |
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#include <stdbool.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include <bpf/bpf.h> |
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#include <bpf/btf.h> |
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#include <bpf/libbpf.h> |
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#include <linux/btf.h> |
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#include <linux/hashtable.h> |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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|
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#include "json_writer.h" |
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#include "main.h" |
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|
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static const char * const btf_kind_str[NR_BTF_KINDS] = { |
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[BTF_KIND_UNKN] = "UNKNOWN", |
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[BTF_KIND_INT] = "INT", |
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[BTF_KIND_PTR] = "PTR", |
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[BTF_KIND_ARRAY] = "ARRAY", |
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[BTF_KIND_STRUCT] = "STRUCT", |
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[BTF_KIND_UNION] = "UNION", |
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[BTF_KIND_ENUM] = "ENUM", |
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[BTF_KIND_FWD] = "FWD", |
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[BTF_KIND_TYPEDEF] = "TYPEDEF", |
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[BTF_KIND_VOLATILE] = "VOLATILE", |
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[BTF_KIND_CONST] = "CONST", |
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[BTF_KIND_RESTRICT] = "RESTRICT", |
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[BTF_KIND_FUNC] = "FUNC", |
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[BTF_KIND_FUNC_PROTO] = "FUNC_PROTO", |
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[BTF_KIND_VAR] = "VAR", |
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[BTF_KIND_DATASEC] = "DATASEC", |
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[BTF_KIND_FLOAT] = "FLOAT", |
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}; |
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struct btf_attach_table { |
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DECLARE_HASHTABLE(table, 16); |
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}; |
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struct btf_attach_point { |
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__u32 obj_id; |
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__u32 btf_id; |
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struct hlist_node hash; |
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}; |
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static const char *btf_int_enc_str(__u8 encoding) |
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{ |
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switch (encoding) { |
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case 0: |
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return "(none)"; |
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case BTF_INT_SIGNED: |
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return "SIGNED"; |
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case BTF_INT_CHAR: |
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return "CHAR"; |
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case BTF_INT_BOOL: |
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return "BOOL"; |
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default: |
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return "UNKN"; |
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} |
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} |
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static const char *btf_var_linkage_str(__u32 linkage) |
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{ |
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switch (linkage) { |
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case BTF_VAR_STATIC: |
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return "static"; |
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case BTF_VAR_GLOBAL_ALLOCATED: |
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return "global"; |
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case BTF_VAR_GLOBAL_EXTERN: |
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return "extern"; |
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default: |
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return "(unknown)"; |
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} |
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} |
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static const char *btf_func_linkage_str(const struct btf_type *t) |
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{ |
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switch (btf_vlen(t)) { |
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case BTF_FUNC_STATIC: |
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return "static"; |
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case BTF_FUNC_GLOBAL: |
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return "global"; |
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case BTF_FUNC_EXTERN: |
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return "extern"; |
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default: |
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return "(unknown)"; |
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} |
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} |
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static const char *btf_str(const struct btf *btf, __u32 off) |
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{ |
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if (!off) |
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return "(anon)"; |
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return btf__name_by_offset(btf, off) ? : "(invalid)"; |
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} |
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static int btf_kind_safe(int kind) |
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{ |
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return kind <= BTF_KIND_MAX ? kind : BTF_KIND_UNKN; |
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} |
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static int dump_btf_type(const struct btf *btf, __u32 id, |
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const struct btf_type *t) |
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{ |
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json_writer_t *w = json_wtr; |
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int kind = btf_kind(t); |
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if (json_output) { |
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jsonw_start_object(w); |
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jsonw_uint_field(w, "id", id); |
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jsonw_string_field(w, "kind", btf_kind_str[btf_kind_safe(kind)]); |
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jsonw_string_field(w, "name", btf_str(btf, t->name_off)); |
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} else { |
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printf("[%u] %s '%s'", id, btf_kind_str[btf_kind_safe(kind)], |
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btf_str(btf, t->name_off)); |
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} |
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switch (kind) { |
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case BTF_KIND_INT: { |
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__u32 v = *(__u32 *)(t + 1); |
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const char *enc; |
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enc = btf_int_enc_str(BTF_INT_ENCODING(v)); |
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if (json_output) { |
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jsonw_uint_field(w, "size", t->size); |
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jsonw_uint_field(w, "bits_offset", BTF_INT_OFFSET(v)); |
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jsonw_uint_field(w, "nr_bits", BTF_INT_BITS(v)); |
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jsonw_string_field(w, "encoding", enc); |
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} else { |
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printf(" size=%u bits_offset=%u nr_bits=%u encoding=%s", |
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t->size, BTF_INT_OFFSET(v), BTF_INT_BITS(v), |
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enc); |
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} |
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break; |
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} |
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case BTF_KIND_PTR: |
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case BTF_KIND_CONST: |
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case BTF_KIND_VOLATILE: |
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case BTF_KIND_RESTRICT: |
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case BTF_KIND_TYPEDEF: |
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if (json_output) |
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jsonw_uint_field(w, "type_id", t->type); |
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else |
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printf(" type_id=%u", t->type); |
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break; |
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case BTF_KIND_ARRAY: { |
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const struct btf_array *arr = (const void *)(t + 1); |
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if (json_output) { |
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jsonw_uint_field(w, "type_id", arr->type); |
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jsonw_uint_field(w, "index_type_id", arr->index_type); |
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jsonw_uint_field(w, "nr_elems", arr->nelems); |
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} else { |
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printf(" type_id=%u index_type_id=%u nr_elems=%u", |
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arr->type, arr->index_type, arr->nelems); |
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} |
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break; |
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} |
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case BTF_KIND_STRUCT: |
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case BTF_KIND_UNION: { |
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const struct btf_member *m = (const void *)(t + 1); |
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__u16 vlen = BTF_INFO_VLEN(t->info); |
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int i; |
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if (json_output) { |
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jsonw_uint_field(w, "size", t->size); |
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jsonw_uint_field(w, "vlen", vlen); |
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jsonw_name(w, "members"); |
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jsonw_start_array(w); |
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} else { |
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printf(" size=%u vlen=%u", t->size, vlen); |
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} |
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for (i = 0; i < vlen; i++, m++) { |
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const char *name = btf_str(btf, m->name_off); |
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__u32 bit_off, bit_sz; |
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if (BTF_INFO_KFLAG(t->info)) { |
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bit_off = BTF_MEMBER_BIT_OFFSET(m->offset); |
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bit_sz = BTF_MEMBER_BITFIELD_SIZE(m->offset); |
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} else { |
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bit_off = m->offset; |
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bit_sz = 0; |
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} |
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if (json_output) { |
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jsonw_start_object(w); |
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jsonw_string_field(w, "name", name); |
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jsonw_uint_field(w, "type_id", m->type); |
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jsonw_uint_field(w, "bits_offset", bit_off); |
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if (bit_sz) { |
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jsonw_uint_field(w, "bitfield_size", |
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bit_sz); |
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} |
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jsonw_end_object(w); |
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} else { |
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printf("\n\t'%s' type_id=%u bits_offset=%u", |
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name, m->type, bit_off); |
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if (bit_sz) |
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printf(" bitfield_size=%u", bit_sz); |
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} |
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} |
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if (json_output) |
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jsonw_end_array(w); |
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break; |
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} |
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case BTF_KIND_ENUM: { |
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const struct btf_enum *v = (const void *)(t + 1); |
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__u16 vlen = BTF_INFO_VLEN(t->info); |
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int i; |
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if (json_output) { |
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jsonw_uint_field(w, "size", t->size); |
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jsonw_uint_field(w, "vlen", vlen); |
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jsonw_name(w, "values"); |
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jsonw_start_array(w); |
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} else { |
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printf(" size=%u vlen=%u", t->size, vlen); |
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} |
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for (i = 0; i < vlen; i++, v++) { |
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const char *name = btf_str(btf, v->name_off); |
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if (json_output) { |
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jsonw_start_object(w); |
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jsonw_string_field(w, "name", name); |
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jsonw_uint_field(w, "val", v->val); |
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jsonw_end_object(w); |
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} else { |
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printf("\n\t'%s' val=%u", name, v->val); |
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} |
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} |
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if (json_output) |
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jsonw_end_array(w); |
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break; |
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} |
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case BTF_KIND_FWD: { |
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const char *fwd_kind = BTF_INFO_KFLAG(t->info) ? "union" |
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: "struct"; |
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if (json_output) |
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jsonw_string_field(w, "fwd_kind", fwd_kind); |
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else |
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printf(" fwd_kind=%s", fwd_kind); |
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break; |
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} |
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case BTF_KIND_FUNC: { |
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const char *linkage = btf_func_linkage_str(t); |
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if (json_output) { |
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jsonw_uint_field(w, "type_id", t->type); |
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jsonw_string_field(w, "linkage", linkage); |
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} else { |
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printf(" type_id=%u linkage=%s", t->type, linkage); |
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} |
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break; |
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} |
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case BTF_KIND_FUNC_PROTO: { |
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const struct btf_param *p = (const void *)(t + 1); |
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__u16 vlen = BTF_INFO_VLEN(t->info); |
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int i; |
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if (json_output) { |
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jsonw_uint_field(w, "ret_type_id", t->type); |
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jsonw_uint_field(w, "vlen", vlen); |
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jsonw_name(w, "params"); |
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jsonw_start_array(w); |
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} else { |
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printf(" ret_type_id=%u vlen=%u", t->type, vlen); |
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} |
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for (i = 0; i < vlen; i++, p++) { |
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const char *name = btf_str(btf, p->name_off); |
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if (json_output) { |
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jsonw_start_object(w); |
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jsonw_string_field(w, "name", name); |
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jsonw_uint_field(w, "type_id", p->type); |
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jsonw_end_object(w); |
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} else { |
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printf("\n\t'%s' type_id=%u", name, p->type); |
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} |
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} |
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if (json_output) |
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jsonw_end_array(w); |
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break; |
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} |
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case BTF_KIND_VAR: { |
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const struct btf_var *v = (const void *)(t + 1); |
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const char *linkage; |
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linkage = btf_var_linkage_str(v->linkage); |
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if (json_output) { |
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jsonw_uint_field(w, "type_id", t->type); |
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jsonw_string_field(w, "linkage", linkage); |
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} else { |
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printf(" type_id=%u, linkage=%s", t->type, linkage); |
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} |
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break; |
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} |
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case BTF_KIND_DATASEC: { |
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const struct btf_var_secinfo *v = (const void *)(t + 1); |
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const struct btf_type *vt; |
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__u16 vlen = BTF_INFO_VLEN(t->info); |
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int i; |
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if (json_output) { |
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jsonw_uint_field(w, "size", t->size); |
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jsonw_uint_field(w, "vlen", vlen); |
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jsonw_name(w, "vars"); |
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jsonw_start_array(w); |
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} else { |
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printf(" size=%u vlen=%u", t->size, vlen); |
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} |
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for (i = 0; i < vlen; i++, v++) { |
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if (json_output) { |
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jsonw_start_object(w); |
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jsonw_uint_field(w, "type_id", v->type); |
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jsonw_uint_field(w, "offset", v->offset); |
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jsonw_uint_field(w, "size", v->size); |
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jsonw_end_object(w); |
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} else { |
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printf("\n\ttype_id=%u offset=%u size=%u", |
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v->type, v->offset, v->size); |
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if (v->type <= btf__get_nr_types(btf)) { |
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vt = btf__type_by_id(btf, v->type); |
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printf(" (%s '%s')", |
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btf_kind_str[btf_kind_safe(btf_kind(vt))], |
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btf_str(btf, vt->name_off)); |
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} |
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} |
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} |
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if (json_output) |
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jsonw_end_array(w); |
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break; |
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} |
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case BTF_KIND_FLOAT: { |
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if (json_output) |
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jsonw_uint_field(w, "size", t->size); |
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else |
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printf(" size=%u", t->size); |
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break; |
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} |
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default: |
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break; |
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} |
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if (json_output) |
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jsonw_end_object(json_wtr); |
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else |
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printf("\n"); |
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return 0; |
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} |
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static int dump_btf_raw(const struct btf *btf, |
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__u32 *root_type_ids, int root_type_cnt) |
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{ |
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const struct btf_type *t; |
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int i; |
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if (json_output) { |
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jsonw_start_object(json_wtr); |
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jsonw_name(json_wtr, "types"); |
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jsonw_start_array(json_wtr); |
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} |
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if (root_type_cnt) { |
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for (i = 0; i < root_type_cnt; i++) { |
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t = btf__type_by_id(btf, root_type_ids[i]); |
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dump_btf_type(btf, root_type_ids[i], t); |
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} |
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} else { |
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const struct btf *base; |
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int cnt = btf__get_nr_types(btf); |
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int start_id = 1; |
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base = btf__base_btf(btf); |
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if (base) |
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start_id = btf__get_nr_types(base) + 1; |
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for (i = start_id; i <= cnt; i++) { |
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t = btf__type_by_id(btf, i); |
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dump_btf_type(btf, i, t); |
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} |
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} |
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if (json_output) { |
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jsonw_end_array(json_wtr); |
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jsonw_end_object(json_wtr); |
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} |
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return 0; |
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} |
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static void __printf(2, 0) btf_dump_printf(void *ctx, |
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const char *fmt, va_list args) |
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{ |
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vfprintf(stdout, fmt, args); |
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} |
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static int dump_btf_c(const struct btf *btf, |
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__u32 *root_type_ids, int root_type_cnt) |
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{ |
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struct btf_dump *d; |
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int err = 0, i; |
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d = btf_dump__new(btf, NULL, NULL, btf_dump_printf); |
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if (IS_ERR(d)) |
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return PTR_ERR(d); |
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printf("#ifndef __VMLINUX_H__\n"); |
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printf("#define __VMLINUX_H__\n"); |
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printf("\n"); |
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printf("#ifndef BPF_NO_PRESERVE_ACCESS_INDEX\n"); |
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printf("#pragma clang attribute push (__attribute__((preserve_access_index)), apply_to = record)\n"); |
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printf("#endif\n\n"); |
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if (root_type_cnt) { |
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for (i = 0; i < root_type_cnt; i++) { |
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err = btf_dump__dump_type(d, root_type_ids[i]); |
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if (err) |
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goto done; |
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} |
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} else { |
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int cnt = btf__get_nr_types(btf); |
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for (i = 1; i <= cnt; i++) { |
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err = btf_dump__dump_type(d, i); |
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if (err) |
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goto done; |
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} |
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} |
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printf("#ifndef BPF_NO_PRESERVE_ACCESS_INDEX\n"); |
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printf("#pragma clang attribute pop\n"); |
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printf("#endif\n"); |
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printf("\n"); |
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printf("#endif /* __VMLINUX_H__ */\n"); |
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done: |
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btf_dump__free(d); |
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return err; |
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} |
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static int do_dump(int argc, char **argv) |
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{ |
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struct btf *btf = NULL, *base = NULL; |
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__u32 root_type_ids[2]; |
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int root_type_cnt = 0; |
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bool dump_c = false; |
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__u32 btf_id = -1; |
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const char *src; |
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int fd = -1; |
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int err; |
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if (!REQ_ARGS(2)) { |
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usage(); |
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return -1; |
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} |
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src = GET_ARG(); |
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if (is_prefix(src, "map")) { |
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struct bpf_map_info info = {}; |
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__u32 len = sizeof(info); |
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if (!REQ_ARGS(2)) { |
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usage(); |
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return -1; |
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} |
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fd = map_parse_fd_and_info(&argc, &argv, &info, &len); |
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if (fd < 0) |
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return -1; |
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btf_id = info.btf_id; |
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if (argc && is_prefix(*argv, "key")) { |
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root_type_ids[root_type_cnt++] = info.btf_key_type_id; |
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NEXT_ARG(); |
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} else if (argc && is_prefix(*argv, "value")) { |
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root_type_ids[root_type_cnt++] = info.btf_value_type_id; |
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NEXT_ARG(); |
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} else if (argc && is_prefix(*argv, "all")) { |
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NEXT_ARG(); |
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} else if (argc && is_prefix(*argv, "kv")) { |
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root_type_ids[root_type_cnt++] = info.btf_key_type_id; |
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root_type_ids[root_type_cnt++] = info.btf_value_type_id; |
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NEXT_ARG(); |
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} else { |
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root_type_ids[root_type_cnt++] = info.btf_key_type_id; |
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root_type_ids[root_type_cnt++] = info.btf_value_type_id; |
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} |
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} else if (is_prefix(src, "prog")) { |
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struct bpf_prog_info info = {}; |
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__u32 len = sizeof(info); |
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|
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if (!REQ_ARGS(2)) { |
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usage(); |
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return -1; |
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} |
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fd = prog_parse_fd(&argc, &argv); |
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if (fd < 0) |
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return -1; |
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|
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err = bpf_obj_get_info_by_fd(fd, &info, &len); |
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if (err) { |
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p_err("can't get prog info: %s", strerror(errno)); |
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goto done; |
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} |
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btf_id = info.btf_id; |
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} else if (is_prefix(src, "id")) { |
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char *endptr; |
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|
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btf_id = strtoul(*argv, &endptr, 0); |
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if (*endptr) { |
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p_err("can't parse %s as ID", *argv); |
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return -1; |
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} |
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NEXT_ARG(); |
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} else if (is_prefix(src, "file")) { |
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const char sysfs_prefix[] = "/sys/kernel/btf/"; |
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const char sysfs_vmlinux[] = "/sys/kernel/btf/vmlinux"; |
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|
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if (!base_btf && |
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strncmp(*argv, sysfs_prefix, sizeof(sysfs_prefix) - 1) == 0 && |
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strcmp(*argv, sysfs_vmlinux) != 0) { |
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base = btf__parse(sysfs_vmlinux, NULL); |
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if (libbpf_get_error(base)) { |
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p_err("failed to parse vmlinux BTF at '%s': %ld\n", |
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sysfs_vmlinux, libbpf_get_error(base)); |
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base = NULL; |
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} |
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} |
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btf = btf__parse_split(*argv, base ?: base_btf); |
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if (IS_ERR(btf)) { |
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err = -PTR_ERR(btf); |
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btf = NULL; |
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p_err("failed to load BTF from %s: %s", |
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*argv, strerror(err)); |
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goto done; |
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} |
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NEXT_ARG(); |
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} else { |
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err = -1; |
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p_err("unrecognized BTF source specifier: '%s'", src); |
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goto done; |
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} |
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|
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while (argc) { |
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if (is_prefix(*argv, "format")) { |
|
NEXT_ARG(); |
|
if (argc < 1) { |
|
p_err("expecting value for 'format' option\n"); |
|
err = -EINVAL; |
|
goto done; |
|
} |
|
if (strcmp(*argv, "c") == 0) { |
|
dump_c = true; |
|
} else if (strcmp(*argv, "raw") == 0) { |
|
dump_c = false; |
|
} else { |
|
p_err("unrecognized format specifier: '%s', possible values: raw, c", |
|
*argv); |
|
err = -EINVAL; |
|
goto done; |
|
} |
|
NEXT_ARG(); |
|
} else { |
|
p_err("unrecognized option: '%s'", *argv); |
|
err = -EINVAL; |
|
goto done; |
|
} |
|
} |
|
|
|
if (!btf) { |
|
err = btf__get_from_id(btf_id, &btf); |
|
if (err) { |
|
p_err("get btf by id (%u): %s", btf_id, strerror(err)); |
|
goto done; |
|
} |
|
if (!btf) { |
|
err = -ENOENT; |
|
p_err("can't find btf with ID (%u)", btf_id); |
|
goto done; |
|
} |
|
} |
|
|
|
if (dump_c) { |
|
if (json_output) { |
|
p_err("JSON output for C-syntax dump is not supported"); |
|
err = -ENOTSUP; |
|
goto done; |
|
} |
|
err = dump_btf_c(btf, root_type_ids, root_type_cnt); |
|
} else { |
|
err = dump_btf_raw(btf, root_type_ids, root_type_cnt); |
|
} |
|
|
|
done: |
|
close(fd); |
|
btf__free(btf); |
|
btf__free(base); |
|
return err; |
|
} |
|
|
|
static int btf_parse_fd(int *argc, char ***argv) |
|
{ |
|
unsigned int id; |
|
char *endptr; |
|
int fd; |
|
|
|
if (!is_prefix(*argv[0], "id")) { |
|
p_err("expected 'id', got: '%s'?", **argv); |
|
return -1; |
|
} |
|
NEXT_ARGP(); |
|
|
|
id = strtoul(**argv, &endptr, 0); |
|
if (*endptr) { |
|
p_err("can't parse %s as ID", **argv); |
|
return -1; |
|
} |
|
NEXT_ARGP(); |
|
|
|
fd = bpf_btf_get_fd_by_id(id); |
|
if (fd < 0) |
|
p_err("can't get BTF object by id (%u): %s", |
|
id, strerror(errno)); |
|
|
|
return fd; |
|
} |
|
|
|
static void delete_btf_table(struct btf_attach_table *tab) |
|
{ |
|
struct btf_attach_point *obj; |
|
struct hlist_node *tmp; |
|
|
|
unsigned int bkt; |
|
|
|
hash_for_each_safe(tab->table, bkt, tmp, obj, hash) { |
|
hash_del(&obj->hash); |
|
free(obj); |
|
} |
|
} |
|
|
|
static int |
|
build_btf_type_table(struct btf_attach_table *tab, enum bpf_obj_type type, |
|
void *info, __u32 *len) |
|
{ |
|
static const char * const names[] = { |
|
[BPF_OBJ_UNKNOWN] = "unknown", |
|
[BPF_OBJ_PROG] = "prog", |
|
[BPF_OBJ_MAP] = "map", |
|
}; |
|
struct btf_attach_point *obj_node; |
|
__u32 btf_id, id = 0; |
|
int err; |
|
int fd; |
|
|
|
while (true) { |
|
switch (type) { |
|
case BPF_OBJ_PROG: |
|
err = bpf_prog_get_next_id(id, &id); |
|
break; |
|
case BPF_OBJ_MAP: |
|
err = bpf_map_get_next_id(id, &id); |
|
break; |
|
default: |
|
err = -1; |
|
p_err("unexpected object type: %d", type); |
|
goto err_free; |
|
} |
|
if (err) { |
|
if (errno == ENOENT) { |
|
err = 0; |
|
break; |
|
} |
|
p_err("can't get next %s: %s%s", names[type], |
|
strerror(errno), |
|
errno == EINVAL ? " -- kernel too old?" : ""); |
|
goto err_free; |
|
} |
|
|
|
switch (type) { |
|
case BPF_OBJ_PROG: |
|
fd = bpf_prog_get_fd_by_id(id); |
|
break; |
|
case BPF_OBJ_MAP: |
|
fd = bpf_map_get_fd_by_id(id); |
|
break; |
|
default: |
|
err = -1; |
|
p_err("unexpected object type: %d", type); |
|
goto err_free; |
|
} |
|
if (fd < 0) { |
|
if (errno == ENOENT) |
|
continue; |
|
p_err("can't get %s by id (%u): %s", names[type], id, |
|
strerror(errno)); |
|
err = -1; |
|
goto err_free; |
|
} |
|
|
|
memset(info, 0, *len); |
|
err = bpf_obj_get_info_by_fd(fd, info, len); |
|
close(fd); |
|
if (err) { |
|
p_err("can't get %s info: %s", names[type], |
|
strerror(errno)); |
|
goto err_free; |
|
} |
|
|
|
switch (type) { |
|
case BPF_OBJ_PROG: |
|
btf_id = ((struct bpf_prog_info *)info)->btf_id; |
|
break; |
|
case BPF_OBJ_MAP: |
|
btf_id = ((struct bpf_map_info *)info)->btf_id; |
|
break; |
|
default: |
|
err = -1; |
|
p_err("unexpected object type: %d", type); |
|
goto err_free; |
|
} |
|
if (!btf_id) |
|
continue; |
|
|
|
obj_node = calloc(1, sizeof(*obj_node)); |
|
if (!obj_node) { |
|
p_err("failed to allocate memory: %s", strerror(errno)); |
|
err = -ENOMEM; |
|
goto err_free; |
|
} |
|
|
|
obj_node->obj_id = id; |
|
obj_node->btf_id = btf_id; |
|
hash_add(tab->table, &obj_node->hash, obj_node->btf_id); |
|
} |
|
|
|
return 0; |
|
|
|
err_free: |
|
delete_btf_table(tab); |
|
return err; |
|
} |
|
|
|
static int |
|
build_btf_tables(struct btf_attach_table *btf_prog_table, |
|
struct btf_attach_table *btf_map_table) |
|
{ |
|
struct bpf_prog_info prog_info; |
|
__u32 prog_len = sizeof(prog_info); |
|
struct bpf_map_info map_info; |
|
__u32 map_len = sizeof(map_info); |
|
int err = 0; |
|
|
|
err = build_btf_type_table(btf_prog_table, BPF_OBJ_PROG, &prog_info, |
|
&prog_len); |
|
if (err) |
|
return err; |
|
|
|
err = build_btf_type_table(btf_map_table, BPF_OBJ_MAP, &map_info, |
|
&map_len); |
|
if (err) { |
|
delete_btf_table(btf_prog_table); |
|
return err; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void |
|
show_btf_plain(struct bpf_btf_info *info, int fd, |
|
struct btf_attach_table *btf_prog_table, |
|
struct btf_attach_table *btf_map_table) |
|
{ |
|
struct btf_attach_point *obj; |
|
const char *name = u64_to_ptr(info->name); |
|
int n; |
|
|
|
printf("%u: ", info->id); |
|
if (info->kernel_btf) |
|
printf("name [%s] ", name); |
|
else if (name && name[0]) |
|
printf("name %s ", name); |
|
else |
|
printf("name <anon> "); |
|
printf("size %uB", info->btf_size); |
|
|
|
n = 0; |
|
hash_for_each_possible(btf_prog_table->table, obj, hash, info->id) { |
|
if (obj->btf_id == info->id) |
|
printf("%s%u", n++ == 0 ? " prog_ids " : ",", |
|
obj->obj_id); |
|
} |
|
|
|
n = 0; |
|
hash_for_each_possible(btf_map_table->table, obj, hash, info->id) { |
|
if (obj->btf_id == info->id) |
|
printf("%s%u", n++ == 0 ? " map_ids " : ",", |
|
obj->obj_id); |
|
} |
|
emit_obj_refs_plain(&refs_table, info->id, "\n\tpids "); |
|
|
|
printf("\n"); |
|
} |
|
|
|
static void |
|
show_btf_json(struct bpf_btf_info *info, int fd, |
|
struct btf_attach_table *btf_prog_table, |
|
struct btf_attach_table *btf_map_table) |
|
{ |
|
struct btf_attach_point *obj; |
|
const char *name = u64_to_ptr(info->name); |
|
|
|
jsonw_start_object(json_wtr); /* btf object */ |
|
jsonw_uint_field(json_wtr, "id", info->id); |
|
jsonw_uint_field(json_wtr, "size", info->btf_size); |
|
|
|
jsonw_name(json_wtr, "prog_ids"); |
|
jsonw_start_array(json_wtr); /* prog_ids */ |
|
hash_for_each_possible(btf_prog_table->table, obj, hash, |
|
info->id) { |
|
if (obj->btf_id == info->id) |
|
jsonw_uint(json_wtr, obj->obj_id); |
|
} |
|
jsonw_end_array(json_wtr); /* prog_ids */ |
|
|
|
jsonw_name(json_wtr, "map_ids"); |
|
jsonw_start_array(json_wtr); /* map_ids */ |
|
hash_for_each_possible(btf_map_table->table, obj, hash, |
|
info->id) { |
|
if (obj->btf_id == info->id) |
|
jsonw_uint(json_wtr, obj->obj_id); |
|
} |
|
jsonw_end_array(json_wtr); /* map_ids */ |
|
|
|
emit_obj_refs_json(&refs_table, info->id, json_wtr); /* pids */ |
|
|
|
jsonw_bool_field(json_wtr, "kernel", info->kernel_btf); |
|
|
|
if (name && name[0]) |
|
jsonw_string_field(json_wtr, "name", name); |
|
|
|
jsonw_end_object(json_wtr); /* btf object */ |
|
} |
|
|
|
static int |
|
show_btf(int fd, struct btf_attach_table *btf_prog_table, |
|
struct btf_attach_table *btf_map_table) |
|
{ |
|
struct bpf_btf_info info; |
|
__u32 len = sizeof(info); |
|
char name[64]; |
|
int err; |
|
|
|
memset(&info, 0, sizeof(info)); |
|
err = bpf_obj_get_info_by_fd(fd, &info, &len); |
|
if (err) { |
|
p_err("can't get BTF object info: %s", strerror(errno)); |
|
return -1; |
|
} |
|
/* if kernel support emitting BTF object name, pass name pointer */ |
|
if (info.name_len) { |
|
memset(&info, 0, sizeof(info)); |
|
info.name_len = sizeof(name); |
|
info.name = ptr_to_u64(name); |
|
len = sizeof(info); |
|
|
|
err = bpf_obj_get_info_by_fd(fd, &info, &len); |
|
if (err) { |
|
p_err("can't get BTF object info: %s", strerror(errno)); |
|
return -1; |
|
} |
|
} |
|
|
|
if (json_output) |
|
show_btf_json(&info, fd, btf_prog_table, btf_map_table); |
|
else |
|
show_btf_plain(&info, fd, btf_prog_table, btf_map_table); |
|
|
|
return 0; |
|
} |
|
|
|
static int do_show(int argc, char **argv) |
|
{ |
|
struct btf_attach_table btf_prog_table; |
|
struct btf_attach_table btf_map_table; |
|
int err, fd = -1; |
|
__u32 id = 0; |
|
|
|
if (argc == 2) { |
|
fd = btf_parse_fd(&argc, &argv); |
|
if (fd < 0) |
|
return -1; |
|
} |
|
|
|
if (argc) { |
|
if (fd >= 0) |
|
close(fd); |
|
return BAD_ARG(); |
|
} |
|
|
|
hash_init(btf_prog_table.table); |
|
hash_init(btf_map_table.table); |
|
err = build_btf_tables(&btf_prog_table, &btf_map_table); |
|
if (err) { |
|
if (fd >= 0) |
|
close(fd); |
|
return err; |
|
} |
|
build_obj_refs_table(&refs_table, BPF_OBJ_BTF); |
|
|
|
if (fd >= 0) { |
|
err = show_btf(fd, &btf_prog_table, &btf_map_table); |
|
close(fd); |
|
goto exit_free; |
|
} |
|
|
|
if (json_output) |
|
jsonw_start_array(json_wtr); /* root array */ |
|
|
|
while (true) { |
|
err = bpf_btf_get_next_id(id, &id); |
|
if (err) { |
|
if (errno == ENOENT) { |
|
err = 0; |
|
break; |
|
} |
|
p_err("can't get next BTF object: %s%s", |
|
strerror(errno), |
|
errno == EINVAL ? " -- kernel too old?" : ""); |
|
err = -1; |
|
break; |
|
} |
|
|
|
fd = bpf_btf_get_fd_by_id(id); |
|
if (fd < 0) { |
|
if (errno == ENOENT) |
|
continue; |
|
p_err("can't get BTF object by id (%u): %s", |
|
id, strerror(errno)); |
|
err = -1; |
|
break; |
|
} |
|
|
|
err = show_btf(fd, &btf_prog_table, &btf_map_table); |
|
close(fd); |
|
if (err) |
|
break; |
|
} |
|
|
|
if (json_output) |
|
jsonw_end_array(json_wtr); /* root array */ |
|
|
|
exit_free: |
|
delete_btf_table(&btf_prog_table); |
|
delete_btf_table(&btf_map_table); |
|
delete_obj_refs_table(&refs_table); |
|
|
|
return err; |
|
} |
|
|
|
static int do_help(int argc, char **argv) |
|
{ |
|
if (json_output) { |
|
jsonw_null(json_wtr); |
|
return 0; |
|
} |
|
|
|
fprintf(stderr, |
|
"Usage: %1$s %2$s { show | list } [id BTF_ID]\n" |
|
" %1$s %2$s dump BTF_SRC [format FORMAT]\n" |
|
" %1$s %2$s help\n" |
|
"\n" |
|
" BTF_SRC := { id BTF_ID | prog PROG | map MAP [{key | value | kv | all}] | file FILE }\n" |
|
" FORMAT := { raw | c }\n" |
|
" " HELP_SPEC_MAP "\n" |
|
" " HELP_SPEC_PROGRAM "\n" |
|
" " HELP_SPEC_OPTIONS "\n" |
|
"", |
|
bin_name, "btf"); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct cmd cmds[] = { |
|
{ "show", do_show }, |
|
{ "list", do_show }, |
|
{ "help", do_help }, |
|
{ "dump", do_dump }, |
|
{ 0 } |
|
}; |
|
|
|
int do_btf(int argc, char **argv) |
|
{ |
|
return cmd_select(cmds, argc, argv, do_help); |
|
}
|
|
|