l2tp: correctly handle ancillary data in the ip6 recv path
l2tp_ip6 is incorrectly using the IPv4-specific ip_cmsg_recv to handle ancillary data. This means that socket options such as IPV6_RECVPKTINFO are not honoured in userspace. Convert l2tp_ip6 to use the IPv6-specific handler. Ref: net/ipv6/udp.c Signed-off-by: Tom Parkin <tparkin@katalix.com> Signed-off-by: James Chapman <jchapman@katalix.com> Signed-off-by: Chris Elston <celston@katalix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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