[NETFILTER]: ctnetlink: add support for master tuple event notification and dumping

This patch adds support for master tuple event notification and
dumping.  Conntrackd needs this information to recover related
connections appropriately.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 28 insertions, 0 deletions

diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index d7da167ef1b8..94027c84be52 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -254,6 +254,29 @@ nla_put_failure:
 #define ctnetlink_dump_mark(a, b) (0)
 #endif
 
+#define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
+
+static inline int
+ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
+{
+        struct nlattr *nest_parms;
+
+        if (!(ct->status & IPS_EXPECTED))
+                return 0;
+
+        nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
+        if (!nest_parms)
+                goto nla_put_failure;
+        if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
+                goto nla_put_failure;
+        nla_nest_end(skb, nest_parms);
+
+        return 0;
+
+nla_put_failure:
+        return -1;
+}
+
 #ifdef CONFIG_NF_NAT_NEEDED
 static inline int
 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
@@ -371,6 +394,7 @@ ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
             ctnetlink_dump_mark(skb, ct) < 0 ||
             ctnetlink_dump_id(skb, ct) < 0 ||
             ctnetlink_dump_use(skb, ct) < 0 ||
+            ctnetlink_dump_master(skb, ct) < 0 ||
             ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
                 goto nla_put_failure;
 
@@ -475,6 +499,10 @@ static int ctnetlink_conntrack_event(struct notifier_block *this,
                      ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0))
                         goto nla_put_failure;
 
+                if (events & IPCT_RELATED &&
+                    ctnetlink_dump_master(skb, ct) < 0)
+                        goto nla_put_failure;
+
                 if (events & IPCT_NATSEQADJ &&
                     ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
                         goto nla_put_failure;