selinux-policy/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',`
ifdef(`self_contained_policy',`',`
module $1 $2;
require { all_kernel_class_perms }
')
')
##############################
#
# For use in interfaces, to optionally insert a require block
#
define(`gen_require',`
ifdef(`self_contained_policy',`',`
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define(`in_gen_require_block')
require {
$1
}
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undefine(`in_gen_require_block')
')
')
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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',`
`define(`$1',`
##### begin $1(dollarsstar)
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$2
##### end $1(dollarsstar)
'')
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')
# helper function, since m4 wont expand macros
# if a line is a comment (#):
define(`policy_m4_comment',`dnl
##### $2 depth: $1
')dnl
##############################
#
# In the future interfaces should be in loadable modules
#
# interface(name,rules)
#
define(`interface',`
`define(`$1',`
define(`policy_temp',incr(policy_call_depth))
pushdef(`policy_call_depth',policy_temp)
undefine(`policy_temp')
policy_m4_comment(policy_call_depth,begin `$1'(dollarsstar))
$2
define(`policy_temp',decr(policy_call_depth))
pushdef(`policy_call_depth',policy_temp)
undefine(`policy_temp')
policy_m4_comment(policy_call_depth,end `$1'(dollarsstar))
'')
')
define(`policy_call_depth',0)
##############################
#
# Optional policy handling
#
define(`optional_policy',`
ifdef(`self_contained_policy',`
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ifdef(`$1',`$2',`$3')
',`
optional {
$2
ifelse(`$3',`',`',`
} else {
$3
')
}
')
')
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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(`delcare_required_symbols',`
ifelse(regexp($1, `\w'), -1, `', `dnl
bool regexp($1, `\(\w+\)', `\1');
delcare_required_symbols(regexp($1, `\w+\(.*\)', `\1'))dnl
') dnl
')
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##############################
#
# Tunable declaration
#
define(`gen_tunable',`
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ifdef(`self_contained_policy',`
bool $1 dflt_or_overr(`$1'_conf,$2);
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',`
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# loadable module tunable
# declaration will go here
# instead of bool when
# loadable modules support
# tunables
bool $1 dflt_or_overr(`$1'_conf,$2);
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')
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')
##############################
#
# Tunable policy handling
#
define(`tunable_policy',`
ifdef(`self_contained_policy',`
if (`$1') {
$2
} else {
$3
}
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',`
# structure for tunables
# will go here instead of a
# conditional when loadable
# modules support tunables
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gen_require(`
delcare_required_symbols(`$1')
')
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if (`$1') {
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$2
} else {
$3
}
')
')