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ipv6: make IPV6_RECVPKTINFO work for ipv4 datagrams

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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>
This commit is contained in:
Hannes Frederic Sowa 2014-01-20 03:43:08 +01:00 • committed by David S. Miller
parent a6e2fe17eb
commit 4b261c75a9
10 changed files with 68 additions and 24 deletions
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9
include/net/transp_v6.h
View file

@ -32,8 +32,13 @@ void tcpv6_exit(void);
int udpv6_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
int ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
struct sk_buff *skb);
/* this does all the common and the specific ctl work */
void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
struct sk_buff *skb);
void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
struct sk_buff *skb);
void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
struct sk_buff *skb);
int ip6_datagram_send_ctl(struct net *net, struct sock *sk, struct msghdr *msg,
struct flowi6 *fl6, struct ipv6_txoptions *opt,