[PATCH nf] ipvs: fix inability to remove a mixed-family RS

[Simon Horman <horms@xxxxxxxxxxxx>]

From: Alexey Andriyanov <alan@xxxxxxxxxx>

The current code prevents any operation with a mixed-family dest
unless IP_VS_CONN_F_TUNNEL flag is set. The problem is that it's impossible
for the client to follow this rule, because ip_vs_genl_parse_dest does
not even read the destination conn_flags when cmd = IPVS_CMD_DEL_DEST
(need_full_dest = 0).

Also, not every client can pass this flag when removing a dest. ipvsadm,
for example, does not support the "-i" command line option together with
the "-d" option.

This change disables any checks for mixed-family on IPVS_CMD_DEL_DEST command.

Signed-off-by: Alexey Andriyanov <alan@xxxxxxxxxx>
Fixes: bc18d37f676f ("ipvs: Allow heterogeneous pools now that we support them")
Acked-by: Julian Anastasov <ja@xxxxxx>
Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
---
 net/netfilter/ipvs/ip_vs_ctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index b8295a4..fdcda8b 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -3399,7 +3399,7 @@ static int ip_vs_genl_set_cmd(struct sk_buff *skb, struct 
genl_info *info)
                if (udest.af == 0)
                        udest.af = svc->af;
 
-               if (udest.af != svc->af) {
+               if (udest.af != svc->af && cmd != IPVS_CMD_DEL_DEST) {
                        /* The synchronization protocol is incompatible
                         * with mixed family services
                         */
-- 
2.1.4

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