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tools: ynl: create local for_each helpers

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Create ynl_attr_for_each*() iteration helpers.
Use them instead of the mnl ones.

Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Link: https://lore.kernel.org/r/20240227223032.1835527-4-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2024-02-27 14:30:20 -08:00
parent 5600c58038
commit 66fcdad088
3 changed files with 57 additions and 10 deletions
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47
tools/net/ynl/lib/ynl-priv.h
View file

@ -147,6 +147,53 @@ static inline void *ynl_attr_data(const struct nlattr *attr)
return (unsigned char *)attr + NLA_HDRLEN;
}
static inline void *ynl_attr_data_end(const struct nlattr *attr)
{
return ynl_attr_data(attr) + ynl_attr_data_len(attr);
}
#define ynl_attr_for_each(attr, nlh, fixed_hdr_sz) \
for ((attr) = ynl_attr_first(nlh, (nlh)->nlmsg_len, \
NLMSG_HDRLEN + fixed_hdr_sz); attr; \
(attr) = ynl_attr_next(ynl_nlmsg_end_addr(nlh), attr))
#define ynl_attr_for_each_nested(attr, outer) \
for ((attr) = ynl_attr_first(outer, outer->nla_len, \
sizeof(struct nlattr)); attr; \
(attr) = ynl_attr_next(ynl_attr_data_end(outer), attr))
#define ynl_attr_for_each_payload(start, len, attr) \
for ((attr) = ynl_attr_first(start, len, 0); attr; \
(attr) = ynl_attr_next(start + len, attr))
static inline struct nlattr *
ynl_attr_if_good(const void *end, struct nlattr *attr)
{
if (attr + 1 > (const struct nlattr *)end)
return NULL;
if (ynl_attr_data_end(attr) > end)
return NULL;
return attr;
}
static inline struct nlattr *
ynl_attr_next(const void *end, const struct nlattr *prev)
{
struct nlattr *attr;
attr = (void *)((char *)prev + NLA_ALIGN(prev->nla_len));
return ynl_attr_if_good(end, attr);
}
static inline struct nlattr *
ynl_attr_first(const void *start, size_t len, size_t skip)
{
struct nlattr *attr;
attr = (void *)((char *)start + NLMSG_ALIGN(skip));
return ynl_attr_if_good(start + len, attr);
}
static inline struct nlattr *
ynl_attr_nest_start(struct nlmsghdr *nlh, unsigned int attr_type)
{

12
tools/net/ynl/lib/ynl.c
View file

@ -92,7 +92,7 @@ ynl_err_walk(struct ynl_sock *ys, void *start, void *end, unsigned int off,
data_len = end - start;
mnl_attr_for_each_payload(start, data_len) {
ynl_attr_for_each_payload(start, data_len, attr) {
astart_off = (char *)attr - (char *)start;
aend_off = astart_off + ynl_attr_data_len(attr);
if (aend_off <= off)
@ -150,7 +150,7 @@ ynl_ext_ack_check(struct ynl_sock *ys, const struct nlmsghdr *nlh,
return MNL_CB_OK;
}
mnl_attr_for_each(attr, nlh, hlen) {
ynl_attr_for_each(attr, nlh, hlen) {
unsigned int len, type;
len = ynl_attr_data_len(attr);
@ -500,7 +500,7 @@ ynl_get_family_info_mcast(struct ynl_sock *ys, const struct nlattr *mcasts)
const struct nlattr *entry, *attr;
unsigned int i;
mnl_attr_for_each_nested(attr, mcasts)
ynl_attr_for_each_nested(attr, mcasts)
ys->n_mcast_groups++;
if (!ys->n_mcast_groups)
@ -512,8 +512,8 @@ ynl_get_family_info_mcast(struct ynl_sock *ys, const struct nlattr *mcasts)
return MNL_CB_ERROR;
i = 0;
mnl_attr_for_each_nested(entry, mcasts) {
mnl_attr_for_each_nested(attr, entry) {
ynl_attr_for_each_nested(entry, mcasts) {
ynl_attr_for_each_nested(attr, entry) {
if (ynl_attr_type(attr) == CTRL_ATTR_MCAST_GRP_ID)
ys->mcast_groups[i].id = ynl_attr_get_u32(attr);
if (ynl_attr_type(attr) == CTRL_ATTR_MCAST_GRP_NAME) {
@ -535,7 +535,7 @@ static int ynl_get_family_info_cb(const struct nlmsghdr *nlh, void *data)
const struct nlattr *attr;
bool found_id = true;
mnl_attr_for_each(attr, nlh, sizeof(struct genlmsghdr)) {
ynl_attr_for_each(attr, nlh, sizeof(struct genlmsghdr)) {
if (ynl_attr_type(attr) == CTRL_ATTR_MCAST_GROUPS)
if (ynl_get_family_info_mcast(ys, attr))
return MNL_CB_ERROR;

8
tools/net/ynl/ynl-gen-c.py
View file

@ -650,7 +650,7 @@ class TypeArrayNest(Type):
def _attr_get(self, ri, var):
local_vars = ['const struct nlattr *attr2;']
get_lines = [f'attr_{self.c_name} = attr;',
'mnl_attr_for_each_nested(attr2, attr)',
'ynl_attr_for_each_nested(attr2, attr)',
f'\t{var}->n_{self.c_name}++;']
return get_lines, None, local_vars
@ -1612,11 +1612,11 @@ def put_req_nested(ri, struct):
def _multi_parse(ri, struct, init_lines, local_vars):
if struct.nested:
iter_line = "mnl_attr_for_each_nested(attr, nested)"
iter_line = "ynl_attr_for_each_nested(attr, nested)"
else:
if ri.fixed_hdr:
local_vars += ['void *hdr;']
iter_line = "mnl_attr_for_each(attr, nlh, yarg->ys->family->hdr_len)"
iter_line = "ynl_attr_for_each(attr, nlh, yarg->ys->family->hdr_len)"
array_nests = set()
multi_attrs = set()
@ -1679,7 +1679,7 @@ def _multi_parse(ri, struct, init_lines, local_vars):
ri.cw.p(f"dst->n_{aspec.c_name} = n_{aspec.c_name};")
ri.cw.p('i = 0;')
ri.cw.p(f"parg.rsp_policy = &{aspec.nested_render_name}_nest;")
ri.cw.block_start(line=f"mnl_attr_for_each_nested(attr, attr_{aspec.c_name})")
ri.cw.block_start(line=f"ynl_attr_for_each_nested(attr, attr_{aspec.c_name})")
ri.cw.p(f"parg.data = &dst->{aspec.c_name}[i];")
ri.cw.p(f"if ({aspec.nested_render_name}_parse(&parg, attr, ynl_attr_type(attr)))")
ri.cw.p('return MNL_CB_ERROR;')