Symbol: GRE_VERS_MASK
sys/net/if_gre.c
1106
switch (gh->gre_flags & htons(GRE_VERS_MASK)) {
sys/net/if_gre.c
1132
if ((gh->gre_flags & htons(~(GRE_KP|GRE_VERS_MASK))) != htons(0))