selinux-refpolicy/policy/support/loadable_module.spt

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########################################
#
# Macros for switching between source policy
# and loadable policy module support
#
##############################
#
# For adding the module statement
#
define(`policy_module',`
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ifndef(`self_contained_policy',`
module $1 $2;
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require {
role system_r;
all_kernel_class_perms
ifdef(`enable_mcs',`
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decl_sens(0,0)
decl_cats(0,decr(mcs_num_cats))
')
ifdef(`enable_mls',`
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decl_sens(0,decr(mls_num_sens))
decl_cats(0,decr(mls_num_cats))
')
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}
')
')
##############################
#
# For use in interfaces, to optionally insert a require block
#
define(`gen_require',`
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ifdef(`self_contained_policy',`
ifdef(`__in_optional_policy',`
require {
$1
} # end require
')
',`
require {
$1
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} # end require
')
')
# helper function, since m4 wont expand macros
# if a line is a comment (#):
define(`policy_m4_comment',`
##### $2 depth: $1
')dnl
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##############################
#
# In the future interfaces should be in loadable modules
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#
# template(name,rules)
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#
define(`template',` dnl
ifdef(`$1',`refpolicyerr(`duplicate definition of $1(). Original definition on '$1.) define(`__if_error')',`define(`$1',__line__)') dnl
`define(`$1',` dnl
define(`policy_temp',incr(policy_call_depth)) dnl
pushdef(`policy_call_depth',policy_temp) dnl
undefine(`policy_temp') dnl
policy_m4_comment(policy_call_depth,begin `$1'(dollarsstar)) dnl
$2 dnl
define(`policy_temp',decr(policy_call_depth)) dnl
pushdef(`policy_call_depth',policy_temp) dnl
undefine(`policy_temp') dnl
policy_m4_comment(policy_call_depth,end `$1'(dollarsstar)) dnl
'')
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')
##############################
#
# In the future interfaces should be in loadable modules
#
# interface(name,rules)
#
define(`interface',` dnl
ifdef(`$1',`refpolicyerr(`duplicate definition of $1(). Original definition on '$1.) define(`__if_error')',`define(`$1',__line__)') dnl
`define(`$1',` dnl
define(`policy_temp',incr(policy_call_depth)) dnl
pushdef(`policy_call_depth',policy_temp) dnl
undefine(`policy_temp') dnl
policy_m4_comment(policy_call_depth,begin `$1'(dollarsstar)) dnl
$2
define(`policy_temp',decr(policy_call_depth)) dnl
pushdef(`policy_call_depth',policy_temp) dnl
undefine(`policy_temp') dnl
policy_m4_comment(policy_call_depth,end `$1'(dollarsstar)) dnl
'')
')
define(`policy_call_depth',0)
##############################
#
# Optional policy handling
#
define(`optional_policy',`
ifelse(regexp(`$1',`\W'),`-1',`
refpolicywarn(`deprecated use of module name ($1) as first parameter of optional_policy() block.')
optional_policy(shift($*))
',`
optional {`'pushdef(`__in_optional_policy')
$1
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ifelse(`$2',`',`',`} else {
$2
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')}`'popdef(`__in_optional_policy')`'ifndef(`__in_optional_policy',` # end optional')
')
')
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##############################
#
# Determine if we should use the default
# tunable value as specified by the policy
# or if the override value should be used
#
define(`dflt_or_overr',`ifdef(`$1',$1,$2)')
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##############################
#
# Extract booleans out of an expression.
# This needs to be reworked so expressions
# with parentheses can work.
define(`declare_required_symbols',`
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ifelse(regexp($1, `\w'), -1, `', `dnl
bool regexp($1, `\(\w+\)', `\1');
declare_required_symbols(regexp($1, `\w+\(.*\)', `\1'))dnl
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') dnl
')
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##############################
#
# Tunable declaration
#
define(`gen_tunable',`
bool $1 dflt_or_overr(`$1'_conf,$2);
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')
##############################
#
# Tunable policy handling
#
define(`tunable_policy',`
gen_require(`
declare_required_symbols(`$1')
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')
if (`$1') {
$2
ifelse(`$3',`',`',`} else {
$3
')}
')