From fe7d57e040f7d189e3bd030f311bb2011a0cc35a Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Tue, 29 Apr 2025 08:46:56 -0700 Subject: [PATCH] tools: ynl: let classic netlink requests specify extra nlflags Classic netlink makes extensive use of flags. Support specifying them the same way as attributes are specified (using a helper), for example: rt_link_newlink_req_set_nlflags(req, NLM_F_CREATE | NLM_F_ECHO); Wrap the code up in a RenderInfo predicate. I think that some genetlink families may want this, too. It should be easy to add a spec property later. Reviewed-by: Donald Hunter Reviewed-by: Jacob Keller Signed-off-by: Jakub Kicinski Link: https://patch.msgid.link/20250429154704.2613851-5-kuba@kernel.org Signed-off-by: Paolo Abeni --- tools/net/ynl/lib/ynl-priv.h | 2 +- tools/net/ynl/lib/ynl.c | 4 ++-- tools/net/ynl/pyynl/ynl_gen_c.py | 21 ++++++++++++++++++++- 3 files changed, 23 insertions(+), 4 deletions(-) diff --git a/tools/net/ynl/lib/ynl-priv.h b/tools/net/ynl/lib/ynl-priv.h index 634eb16548b93..5debb09491e7b 100644 --- a/tools/net/ynl/lib/ynl-priv.h +++ b/tools/net/ynl/lib/ynl-priv.h @@ -94,7 +94,7 @@ struct ynl_ntf_base_type { unsigned char data[] __attribute__((aligned(8))); }; -struct nlmsghdr *ynl_msg_start_req(struct ynl_sock *ys, __u32 id); +struct nlmsghdr *ynl_msg_start_req(struct ynl_sock *ys, __u32 id, __u16 flags); struct nlmsghdr *ynl_msg_start_dump(struct ynl_sock *ys, __u32 id); struct nlmsghdr * diff --git a/tools/net/ynl/lib/ynl.c b/tools/net/ynl/lib/ynl.c index 70f899a540076..c16f01372ca32 100644 --- a/tools/net/ynl/lib/ynl.c +++ b/tools/net/ynl/lib/ynl.c @@ -451,9 +451,9 @@ ynl_gemsg_start(struct ynl_sock *ys, __u32 id, __u16 flags, return nlh; } -struct nlmsghdr *ynl_msg_start_req(struct ynl_sock *ys, __u32 id) +struct nlmsghdr *ynl_msg_start_req(struct ynl_sock *ys, __u32 id, __u16 flags) { - return ynl_msg_start(ys, id, NLM_F_REQUEST | NLM_F_ACK); + return ynl_msg_start(ys, id, NLM_F_REQUEST | NLM_F_ACK | flags); } struct nlmsghdr *ynl_msg_start_dump(struct ynl_sock *ys, __u32 id) diff --git a/tools/net/ynl/pyynl/ynl_gen_c.py b/tools/net/ynl/pyynl/ynl_gen_c.py index 898c41a7a81fe..c035abb8ae1c5 100755 --- a/tools/net/ynl/pyynl/ynl_gen_c.py +++ b/tools/net/ynl/pyynl/ynl_gen_c.py @@ -1294,6 +1294,9 @@ class RenderInfo: def type_empty(self, key): return len(self.struct[key].attr_list) == 0 and self.fixed_hdr is None + def needs_nlflags(self, direction): + return self.op_mode == 'do' and direction == 'request' and self.family.is_classic() + class CodeWriter: def __init__(self, nlib, out_file=None, overwrite=True): @@ -1924,7 +1927,7 @@ def print_req(ri): ri.cw.write_func_lvar(local_vars) if ri.family.is_classic(): - ri.cw.p(f"nlh = ynl_msg_start_req(ys, {ri.op.enum_name});") + ri.cw.p(f"nlh = ynl_msg_start_req(ys, {ri.op.enum_name}, req->_nlmsg_flags);") else: ri.cw.p(f"nlh = ynl_gemsg_start_req(ys, {ri.nl.get_family_id()}, {ri.op.enum_name}, 1);") @@ -2053,6 +2056,16 @@ def print_free_prototype(ri, direction, suffix=';'): ri.cw.write_func_prot('void', f"{name}_free", [f"struct {struct_name} *{arg}"], suffix=suffix) +def print_nlflags_set(ri, direction): + name = op_prefix(ri, direction) + ri.cw.write_func_prot(f'static inline void', f"{name}_set_nlflags", + [f"struct {name} *req", "__u16 nl_flags"]) + ri.cw.block_start() + ri.cw.p('req->_nlmsg_flags = nl_flags;') + ri.cw.block_end() + ri.cw.nl() + + def _print_type(ri, direction, struct): suffix = f'_{ri.type_name}{direction_to_suffix[direction]}' if not direction and ri.type_name_conflict: @@ -2063,6 +2076,9 @@ def _print_type(ri, direction, struct): ri.cw.block_start(line=f"struct {ri.family.c_name}{suffix}") + if ri.needs_nlflags(direction): + ri.cw.p('__u16 _nlmsg_flags;') + ri.cw.nl() if ri.fixed_hdr: ri.cw.p(ri.fixed_hdr + ' _hdr;') ri.cw.nl() @@ -2102,6 +2118,9 @@ def print_type_helpers(ri, direction, deref=False): print_free_prototype(ri, direction) ri.cw.nl() + if ri.needs_nlflags(direction): + print_nlflags_set(ri, direction) + if ri.ku_space == 'user' and direction == 'request': for _, attr in ri.struct[direction].member_list(): attr.setter(ri, ri.attr_set, direction, deref=deref) -- 2.39.5