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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2019 Facebook */
#include <linux/bpf.h>
#include <linux/bpf_verifier.h>
#include <linux/btf.h>
#include <linux/filter.h>
#include <linux/slab.h>
#include <linux/numa.h>
#include <linux/seq_file.h>
#include <linux/refcount.h>
#define BPF_STRUCT_OPS_TYPE(_name) \
extern struct bpf_struct_ops bpf_##_name;
#include "bpf_struct_ops_types.h"
#undef BPF_STRUCT_OPS_TYPE
enum {
#define BPF_STRUCT_OPS_TYPE(_name) BPF_STRUCT_OPS_TYPE_##_name,
#include "bpf_struct_ops_types.h"
#undef BPF_STRUCT_OPS_TYPE
__NR_BPF_STRUCT_OPS_TYPE,
};
static struct bpf_struct_ops * const bpf_struct_ops[] = {
#define BPF_STRUCT_OPS_TYPE(_name) \
[BPF_STRUCT_OPS_TYPE_##_name] = &bpf_##_name,
#include "bpf_struct_ops_types.h"
#undef BPF_STRUCT_OPS_TYPE
};
const struct bpf_verifier_ops bpf_struct_ops_verifier_ops = {
};
const struct bpf_prog_ops bpf_struct_ops_prog_ops = {
};
void bpf_struct_ops_init(struct btf *btf)
{
const struct btf_member *member;
struct bpf_struct_ops *st_ops;
struct bpf_verifier_log log = {};
const struct btf_type *t;
const char *mname;
s32 type_id;
u32 i, j;
for (i = 0; i < ARRAY_SIZE(bpf_struct_ops); i++) {
st_ops = bpf_struct_ops[i];
type_id = btf_find_by_name_kind(btf, st_ops->name,
BTF_KIND_STRUCT);
if (type_id < 0) {
pr_warn("Cannot find struct %s in btf_vmlinux\n",
st_ops->name);
continue;
}
t = btf_type_by_id(btf, type_id);
if (btf_type_vlen(t) > BPF_STRUCT_OPS_MAX_NR_MEMBERS) {
pr_warn("Cannot support #%u members in struct %s\n",
btf_type_vlen(t), st_ops->name);
continue;
}
for_each_member(j, t, member) {
const struct btf_type *func_proto;
mname = btf_name_by_offset(btf, member->name_off);
if (!*mname) {
pr_warn("anon member in struct %s is not supported\n",
st_ops->name);
break;
}
if (btf_member_bitfield_size(t, member)) {
pr_warn("bit field member %s in struct %s is not supported\n",
mname, st_ops->name);
break;
}
func_proto = btf_type_resolve_func_ptr(btf,
member->type,
NULL);
if (func_proto &&
btf_distill_func_proto(&log, btf,
func_proto, mname,
&st_ops->func_models[j])) {
pr_warn("Error in parsing func ptr %s in struct %s\n",
mname, st_ops->name);
break;
}
}
if (j == btf_type_vlen(t)) {
if (st_ops->init(btf)) {
pr_warn("Error in init bpf_struct_ops %s\n",
st_ops->name);
} else {
st_ops->type_id = type_id;
st_ops->type = t;
}
}
}
}
extern struct btf *btf_vmlinux;
const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id)
{
unsigned int i;
if (!type_id || !btf_vmlinux)
return NULL;
for (i = 0; i < ARRAY_SIZE(bpf_struct_ops); i++) {
if (bpf_struct_ops[i]->type_id == type_id)
return bpf_struct_ops[i];
}
return NULL;
}
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