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bpf: split verifier and program ops

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struct bpf_verifier_ops contains both verifier ops and operations
used later during program's lifetime (test_run).  Split the runtime
ops into a different structure.

BPF_PROG_TYPE() will now append ## _prog_ops or ## _verifier_ops
to the names.

Signed-off-by: Jakub Kicinski <[email protected]>
Acked-by: Daniel Borkmann <[email protected]>
Acked-by: Alexei Starovoitov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Jakub Kicinski 2017-10-16 16:40:53 -07:00 • committed by David S. Miller
commit 7de16e3a35
6 changed files with 91 additions and 40 deletions
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16
kernel/bpf/syscall.c
View file

@ -739,9 +739,18 @@ err_put:
return err;
}
static const struct bpf_verifier_ops * const bpf_prog_types[] = {
#define BPF_PROG_TYPE(_id, _ops) \
[_id] = &_ops,
static const struct bpf_prog_ops * const bpf_prog_types[] = {
#define BPF_PROG_TYPE(_id, _name) \
[_id] = & _name ## _prog_ops,
#define BPF_MAP_TYPE(_id, _ops)
#include <linux/bpf_types.h>
#undef BPF_PROG_TYPE
#undef BPF_MAP_TYPE
};
static const struct bpf_verifier_ops * const bpf_verifier_ops[] = {
#define BPF_PROG_TYPE(_id, _name) \
[_id] = & _name ## _verifier_ops,
#define BPF_MAP_TYPE(_id, _ops)
#include <linux/bpf_types.h>
#undef BPF_PROG_TYPE
@ -754,6 +763,7 @@ static int find_prog_type(enum bpf_prog_type type, struct bpf_prog *prog)
return -EINVAL;
prog->aux->ops = bpf_prog_types[type];
prog->aux->vops = bpf_verifier_ops[type];
prog->type = type;
return 0;
}

12
kernel/bpf/verifier.c
View file

@ -856,8 +856,8 @@ static int check_ctx_access(struct bpf_verifier_env *env, int insn_idx, int off,
*reg_type = info.reg_type;
return 0;
}
} else if (env->prog->aux->ops->is_valid_access &&
env->prog->aux->ops->is_valid_access(off, size, t, &info)) {
} else if (env->prog->aux->vops->is_valid_access &&
env->prog->aux->vops->is_valid_access(off, size, t, &info)) {
/* A non zero info.ctx_field_size indicates that this field is a
* candidate for later verifier transformation to load the whole
* field and then apply a mask when accessed with a narrower
@ -1565,8 +1565,8 @@ static int check_call(struct bpf_verifier_env *env, int func_id, int insn_idx)
return -EINVAL;
}
if (env->prog->aux->ops->get_func_proto)
fn = env->prog->aux->ops->get_func_proto(func_id);
if (env->prog->aux->vops->get_func_proto)
fn = env->prog->aux->vops->get_func_proto(func_id);
if (!fn) {
verbose(env, "unknown func %s#%d\n", func_id_name(func_id),
@ -4035,7 +4035,7 @@ static struct bpf_prog *bpf_patch_insn_data(struct bpf_verifier_env *env, u32 of
*/
static int convert_ctx_accesses(struct bpf_verifier_env *env)
{
const struct bpf_verifier_ops *ops = env->prog->aux->ops;
const struct bpf_verifier_ops *ops = env->prog->aux->vops;
int i, cnt, size, ctx_field_size, delta = 0;
const int insn_cnt = env->prog->len;
struct bpf_insn insn_buf[16], *insn;
@ -4236,7 +4236,7 @@ static int fixup_bpf_calls(struct bpf_verifier_env *env)
insn = new_prog->insnsi + i + delta;
}
patch_call_imm:
fn = prog->aux->ops->get_func_proto(insn->imm);
fn = prog->aux->vops->get_func_proto(insn->imm);
/* all functions that have prototype and verifier allowed
* programs to call them, must be real in-kernel functions
*/