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tools: ynl-gen: support fixed headers in genetlink

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Support genetlink families using simple fixed headers.
Assume fixed header is identical for all ops of the family for now.

Fixed headers are added to the request and reply structs as a _hdr
member, and copied to/from netlink messages appropriately.

Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Link: https://lore.kernel.org/r/20231213231432.2944749-4-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2023-12-13 15:14:27 -08:00
parent 139c163b5b
commit f6805072c2
3 changed files with 45 additions and 8 deletions
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8
tools/net/ynl/lib/ynl.c
View file

@ -191,12 +191,12 @@ ynl_ext_ack_check(struct ynl_sock *ys, const struct nlmsghdr *nlh,
str ? " (" : "");
start = mnl_nlmsg_get_payload_offset(ys->nlh,
sizeof(struct genlmsghdr));
ys->family->hdr_len);
end = mnl_nlmsg_get_payload_tail(ys->nlh);
off = ys->err.attr_offs;
off -= sizeof(struct nlmsghdr);
off -= sizeof(struct genlmsghdr);
off -= ys->family->hdr_len;
n += ynl_err_walk(ys, start, end, off, ys->req_policy,
&bad_attr[n], sizeof(bad_attr) - n, NULL);
@ -217,14 +217,14 @@ ynl_ext_ack_check(struct ynl_sock *ys, const struct nlmsghdr *nlh,
bad_attr[0] ? ", " : (str ? " (" : ""));
start = mnl_nlmsg_get_payload_offset(ys->nlh,
sizeof(struct genlmsghdr));
ys->family->hdr_len);
end = mnl_nlmsg_get_payload_tail(ys->nlh);
nest_pol = ys->req_policy;
if (tb[NLMSGERR_ATTR_MISS_NEST]) {
off = mnl_attr_get_u32(tb[NLMSGERR_ATTR_MISS_NEST]);
off -= sizeof(struct nlmsghdr);
off -= sizeof(struct genlmsghdr);
off -= ys->family->hdr_len;
n += ynl_err_walk(ys, start, end, off, ys->req_policy,
&miss_attr[n], sizeof(miss_attr) - n,

1
tools/net/ynl/lib/ynl.h
View file

@ -44,6 +44,7 @@ struct ynl_error {
struct ynl_family {
/* private: */
const char *name;
size_t hdr_len;
const struct ynl_ntf_info *ntf_info;
unsigned int ntf_info_size;
};

44
tools/net/ynl/ynl-gen-c.py
View file

@ -1124,6 +1124,10 @@ class RenderInfo:
self.op_mode = op_mode
self.op = op
self.fixed_hdr = None
if op and op.fixed_header:
self.fixed_hdr = 'struct ' + c_lower(op.fixed_header)
# 'do' and 'dump' response parsing is identical
self.type_consistent = True
if op_mode != 'do' and 'dump' in op:
@ -1570,7 +1574,9 @@ def _multi_parse(ri, struct, init_lines, local_vars):
if struct.nested:
iter_line = "mnl_attr_for_each_nested(attr, nested)"
else:
iter_line = "mnl_attr_for_each(attr, nlh, sizeof(struct genlmsghdr))"
if ri.fixed_hdr:
local_vars += ['void *hdr;']
iter_line = "mnl_attr_for_each(attr, nlh, yarg->ys->family->hdr_len)"
array_nests = set()
multi_attrs = set()
@ -1603,6 +1609,9 @@ def _multi_parse(ri, struct, init_lines, local_vars):
for arg in struct.inherited:
ri.cw.p(f'dst->{arg} = {arg};')
if ri.fixed_hdr:
ri.cw.p('hdr = mnl_nlmsg_get_payload_offset(nlh, sizeof(struct genlmsghdr));')
ri.cw.p(f"memcpy(&dst->_hdr, hdr, sizeof({ri.fixed_hdr}));")
for anest in sorted(all_multi):
aspec = struct[anest]
ri.cw.p(f"if (dst->{aspec.c_name})")
@ -1723,6 +1732,10 @@ def print_req(ri):
ret_err = 'NULL'
local_vars += [f'{type_name(ri, rdir(direction))} *rsp;']
if ri.fixed_hdr:
local_vars += ['size_t hdr_len;',
'void *hdr;']
print_prototype(ri, direction, terminate=False)
ri.cw.block_start()
ri.cw.write_func_lvar(local_vars)
@ -1733,6 +1746,13 @@ def print_req(ri):
if 'reply' in ri.op[ri.op_mode]:
ri.cw.p(f"yrs.yarg.rsp_policy = &{ri.struct['reply'].render_name}_nest;")
ri.cw.nl()
if ri.fixed_hdr:
ri.cw.p("hdr_len = sizeof(req->_hdr);")
ri.cw.p("hdr = mnl_nlmsg_put_extra_header(nlh, hdr_len);")
ri.cw.p("memcpy(hdr, &req->_hdr, hdr_len);")
ri.cw.nl()
for _, attr in ri.struct["request"].member_list():
attr.attr_put(ri, "req")
ri.cw.nl()
@ -1773,9 +1793,11 @@ def print_dump(ri):
'struct nlmsghdr *nlh;',
'int err;']
for var in local_vars:
ri.cw.p(f'{var}')
ri.cw.nl()
if ri.fixed_hdr:
local_vars += ['size_t hdr_len;',
'void *hdr;']
ri.cw.write_func_lvar(local_vars)
ri.cw.p('yds.ys = ys;')
ri.cw.p(f"yds.alloc_sz = sizeof({type_name(ri, rdir(direction))});")
@ -1788,6 +1810,12 @@ def print_dump(ri):
ri.cw.nl()
ri.cw.p(f"nlh = ynl_gemsg_start_dump(ys, {ri.nl.get_family_id()}, {ri.op.enum_name}, 1);")
if ri.fixed_hdr:
ri.cw.p("hdr_len = sizeof(req->_hdr);")
ri.cw.p("hdr = mnl_nlmsg_put_extra_header(nlh, hdr_len);")
ri.cw.p("memcpy(hdr, &req->_hdr, hdr_len);")
ri.cw.nl()
if "request" in ri.op[ri.op_mode]:
ri.cw.p(f"ys->req_policy = &{ri.struct['request'].render_name}_nest;")
ri.cw.nl()
@ -1845,6 +1873,10 @@ def _print_type(ri, direction, struct):
ri.cw.block_start(line=f"struct {ri.family.c_name}{suffix}")
if ri.fixed_hdr:
ri.cw.p(ri.fixed_hdr + ' _hdr;')
ri.cw.nl()
meta_started = False
for _, attr in struct.member_list():
for type_filter in ['len', 'bit']:
@ -2482,6 +2514,10 @@ def render_user_family(family, cw, prototype):
cw.block_start(f'{symbol} = ')
cw.p(f'.name\t\t= "{family.c_name}",')
if family.fixed_header:
cw.p(f'.hdr_len\t= sizeof(struct genlmsghdr) + sizeof(struct {c_lower(family.fixed_header)}),')
else:
cw.p('.hdr_len\t= sizeof(struct genlmsghdr),')
if family.ntfs:
cw.p(f".ntf_info\t= {family['name']}_ntf_info,")
cw.p(f".ntf_info_size\t= MNL_ARRAY_SIZE({family['name']}_ntf_info),")