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netlink: add NLA_POLICY_MAX_LEN macro

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Similarly to NLA_POLICY_MIN_LEN, NLA_POLICY_MAX_LEN defines a policy
with a maximum length value.

The netlink generator for YAML specs has been extended accordingly.

Signed-off-by: Antonio Quartulli <antonio@openvpn.net>
Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Link: https://patch.msgid.link/20241029-b4-ovpn-v11-1-de4698c73a25@openvpn.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Antonio Quartulli 2024-10-29 11:47:14 +01:00 committed by Jakub Kicinski
parent bd50c4125c
commit 4138e9ec00
2 changed files with 4 additions and 1 deletions
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1
include/net/netlink.h
View File

@ -469,6 +469,7 @@ struct nla_policy {
.max = _len \
}
#define NLA_POLICY_MIN_LEN(_len) NLA_POLICY_MIN(NLA_BINARY, _len)
#define NLA_POLICY_MAX_LEN(_len) NLA_POLICY_MAX(NLA_BINARY, _len)
/**
* struct nl_info - netlink source information

4
tools/net/ynl/ynl-gen-c.py
View File

@ -481,7 +481,7 @@ class TypeBinary(Type):
pass
elif len(self.checks) == 1:
check_name = list(self.checks)[0]
if check_name not in {'exact-len', 'min-len'}:
if check_name not in {'exact-len', 'min-len', 'max-len'}:
raise Exception('Unsupported check for binary type: ' + check_name)
else:
raise Exception('More than one check for binary type not implemented, yet')
@ -492,6 +492,8 @@ class TypeBinary(Type):
mem = 'NLA_POLICY_EXACT_LEN(' + self.get_limit_str('exact-len') + ')'
elif 'min-len' in self.checks:
mem = '{ .len = ' + self.get_limit_str('min-len') + ', }'
elif 'max-len' in self.checks:
mem = 'NLA_POLICY_MAX_LEN(' + self.get_limit_str('max-len') + ')'
return mem