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ndisc: add static asserts to _route_preference_coerce()

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Our internal NMIcmpv6RouterPref defines must be numerically identical
to the values in the protocol. Add a static assertion for that.
This commit is contained in:
Thomas Haller
2021-01-21 08:14:37 +01:00
parent 779ee32263
commit 8a3310043b
1 changed files with 15 additions and 3 deletions
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18
src/ndisc/nm-lndp-ndisc.c
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@@ -85,14 +85,26 @@ send_rs(NMNDisc *ndisc, GError **error)
static NMIcmpv6RouterPref
_route_preference_coerce(enum ndp_route_preference pref)
{
#define _ASSERT_ENUM(v1, v2) \
G_STMT_START \
{ \
G_STATIC_ASSERT((NMIcmpv6RouterPref)(v1) == (v2)); \
G_STATIC_ASSERT((enum ndp_route_preference)(v2) == (v1)); \
G_STATIC_ASSERT((gint64)(v1) == (v2)); \
G_STATIC_ASSERT((gint64)(v2) == (v1)); \
} \
G_STMT_END
switch (pref) {
case NDP_ROUTE_PREF_LOW:
return NM_ICMPV6_ROUTER_PREF_LOW;
case NDP_ROUTE_PREF_MEDIUM:
return NM_ICMPV6_ROUTER_PREF_MEDIUM;
case NDP_ROUTE_PREF_HIGH:
return NM_ICMPV6_ROUTER_PREF_HIGH;
_ASSERT_ENUM(NDP_ROUTE_PREF_LOW, NM_ICMPV6_ROUTER_PREF_LOW);
_ASSERT_ENUM(NDP_ROUTE_PREF_MEDIUM, NM_ICMPV6_ROUTER_PREF_MEDIUM);
_ASSERT_ENUM(NDP_ROUTE_PREF_HIGH, NM_ICMPV6_ROUTER_PREF_HIGH);
return (NMIcmpv6RouterPref) pref;
}
/* unexpected value must be treated as MEDIUM (RFC 4191). */
return NM_ICMPV6_ROUTER_PREF_MEDIUM;
}