tools: ynl-gen: use big-endian netlink attribute types

Change ynl-gen-c.py to use NLA_BE16 and NLA_BE32 types to represent
big-endian u16 and u32 ynl types.

Doing this enables those attributes to have range checks applied, as
the validator will then convert to host endianness prior to validation.

The autogenerated kernel/uapi code have been regenerated by running:
  ./tools/net/ynl/ynl-regen.sh -f

This changes the policy types of the following attributes:

  FOU_ATTR_PORT (NLA_U16 -> NLA_BE16)
  FOU_ATTR_PEER_PORT (NLA_U16 -> NLA_BE16)
    These two are used with nla_get_be16/nla_put_be16().

  MPTCP_PM_ADDR_ATTR_ADDR4 (NLA_U32 -> NLA_BE32)
    This one is used with nla_get_in_addr/nla_put_in_addr(),
    which uses nla_get_be32/nla_put_be32().

IOWs the generated changes are AFAICT aligned with their implementations.

The generated userspace code remains identical, and have been verified
by comparing the output generated by the following command:
  make -C tools/net/ynl/generated

Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20241017094704.3222173-1-ast@fiberby.net
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

net/ipv4/fou_nl.c

@@ -12,7 +12,7 @@
 
 /* Global operation policy for fou */
 const struct nla_policy fou_nl_policy[FOU_ATTR_IFINDEX + 1] = {
-	[FOU_ATTR_PORT] = { .type = NLA_U16, },
+	[FOU_ATTR_PORT] = { .type = NLA_BE16, },
 	[FOU_ATTR_AF] = { .type = NLA_U8, },
 	[FOU_ATTR_IPPROTO] = { .type = NLA_U8, },
 	[FOU_ATTR_TYPE] = { .type = NLA_U8, },
@@ -21,7 +21,7 @@ const struct nla_policy fou_nl_policy[FOU_ATTR_IFINDEX + 1] = {
 	[FOU_ATTR_LOCAL_V6] = { .len = 16, },
 	[FOU_ATTR_PEER_V4] = { .type = NLA_U32, },
 	[FOU_ATTR_PEER_V6] = { .len = 16, },
-	[FOU_ATTR_PEER_PORT] = { .type = NLA_U16, },
+	[FOU_ATTR_PEER_PORT] = { .type = NLA_BE16, },
 	[FOU_ATTR_IFINDEX] = { .type = NLA_S32, },
 };
 

net/mptcp/mptcp_pm_gen.c

@@ -14,7 +14,7 @@
 const struct nla_policy mptcp_pm_address_nl_policy[MPTCP_PM_ADDR_ATTR_IF_IDX + 1] = {
 	[MPTCP_PM_ADDR_ATTR_FAMILY] = { .type = NLA_U16, },
 	[MPTCP_PM_ADDR_ATTR_ID] = { .type = NLA_U8, },
-	[MPTCP_PM_ADDR_ATTR_ADDR4] = { .type = NLA_U32, },
+	[MPTCP_PM_ADDR_ATTR_ADDR4] = { .type = NLA_BE32, },
 	[MPTCP_PM_ADDR_ATTR_ADDR6] = NLA_POLICY_EXACT_LEN(16),
 	[MPTCP_PM_ADDR_ATTR_PORT] = { .type = NLA_U16, },
 	[MPTCP_PM_ADDR_ATTR_FLAGS] = { .type = NLA_U32, },

tools/net/ynl/ynl-gen-c.py

@@ -167,7 +167,10 @@ def _attr_policy(self, policy):
         return '{ .type = ' + policy + ', }'
 
     def attr_policy(self, cw):
-        policy = c_upper('nla-' + self.attr['type'])
+        policy = f'NLA_{c_upper(self.type)}'
+        if self.attr.get('byte-order') == 'big-endian':
+            if self.type in {'u16', 'u32'}:
+                policy = f'NLA_BE{self.type[1:]}'
 
         spec = self._attr_policy(policy)
         cw.p(f"\t[{self.enum_name}] = {spec},")