ipv6: Fix ipv6_getsockopt for IPV6_2292PKTOPTIONS

IPV6_2292PKTOPTIONS is broken for 32-bit applications running
in COMPAT mode on 64-bit kernels.

The same problem was fixed for IPv4 with the patch:
ipv4: Fix ip_getsockopt for IP_PKTOPTIONS,
commit dd23198e58cd35259dd09e8892bbdb90f1d57748

Signed-off-by: Sorin Dumitru <sdumitru@ixiacom.com>
Signed-off-by: Daniel Baluta <dbaluta@ixiacom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 9cb191ecaba8e7992834242364c745287157c317..147ede38ab484e7447516c0499900a592b235a15 100644 (file)
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -913,7 +913,7 @@ static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 }
 
 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
-                   char __user *optval, int __user *optlen)
+                   char __user *optval, int __user *optlen, unsigned flags)
 {
        struct ipv6_pinfo *np = inet6_sk(sk);
        int len;
@@ -962,7 +962,7 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 
                msg.msg_control = optval;
                msg.msg_controllen = len;
-               msg.msg_flags = 0;
+               msg.msg_flags = flags;
 
                lock_sock(sk);
                skb = np->pktoptions;
@@ -1222,7 +1222,7 @@ int ipv6_getsockopt(struct sock *sk, int level, int optname,
        if(level != SOL_IPV6)
                return -ENOPROTOOPT;
 
-       err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
+       err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
 #ifdef CONFIG_NETFILTER
        /* we need to exclude all possible ENOPROTOOPTs except default case */
        if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
@@ -1264,7 +1264,8 @@ int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
                return compat_mc_getsockopt(sk, level, optname, optval, optlen,
                        ipv6_getsockopt);
 
-       err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
+       err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
+                                MSG_CMSG_COMPAT);
 #ifdef CONFIG_NETFILTER
        /* we need to exclude all possible ENOPROTOOPTs except default case */
        if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {