ipv6: make IPV6_RECVPKTINFO work for ipv4 datagrams
We currently don't report IPV6_RECVPKTINFO in cmsg access ancillary data
for IPv4 datagrams on IPv6 sockets.
This patch splits the ip6_datagram_recv_ctl into two functions, one
which handles both protocol families, AF_INET and AF_INET6, while the
ip6_datagram_recv_specific_ctl only handles IPv6 cmsg data.
ip6_datagram_recv_*_ctl never reported back any errors, so we can make
them return void. Also provide a helper for protocols which don't offer dual
personality to further use ip6_datagram_recv_ctl, which is exported to
modules.
I needed to shuffle the code for ping around a bit to make it easier to
implement dual personality for ping ipv6 sockets in future.
Reported-by: Gert Doering <gert@space.net>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 1084304..2faef33 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -284,6 +284,8 @@
#define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only)
#define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
+#define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
+ inet6_sk(sk)->rxopt.bits.rxinfo)
static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
{
@@ -300,6 +302,7 @@
#else
#define __ipv6_only_sock(sk) 0
#define ipv6_only_sock(sk) 0
+#define ipv6_sk_rxinfo(sk) 0
static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
{