tree 2ba84d4f69310037ce27f7c3df199dab5cf0f47a
parent daca2cf463496e5844812ea13a4fafefafe4853f
author David Lamparter <equinox@diac24.net> 1254666109 +0200
committer Denis Ovsienko <infrastation@yandex.ru> 1321885501 +0400

lib: add sockopt helper for setting IPV6_V6ONLY and use it

getaddrinfo returns a list of socket parameters for listening. it
will contain both IPv4 and IPv6 listening sockets. unless we use
IPV6_V6ONLY on the IPv6 ones, only the socket listed first will
work. if the IPv4 one came first, the IPv6 one would get an
"Address in use" error.

this functionality was already present for bgpd and its listening
sockets. as it is needed for vtys as well, make it a common helper.