tipc: add loopback device tracking

Since node internal messages are passed directly to the socket, it is not
possible to observe those messages via tcpdump or wireshark.

We now remedy this by making it possible to clone such messages and send
the clones to the loopback interface.  The clones are dropped at reception
and have no functional role except making the traffic visible.

The feature is enabled if network taps are active for the loopback device.
pcap filtering restrictions require the messages to be presented to the
receiving side of the loopback device.

v3 - Function dev_nit_active used to check for network taps.
   - Procedure netif_rx_ni used to send cloned messages to loopback device.

Signed-off-by: John Rutherford <john.rutherford@dektech.com.au>
Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

7 files changed, 88 insertions, 1 deletions

diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index 1336f3cdad38..34f3e5641438 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -406,8 +406,10 @@ int tipc_mcast_xmit(struct net *net, struct sk_buff_head *pkts,
                         rc = tipc_bcast_xmit(net, pkts, cong_link_cnt);
         }
 
-        if (dests->local)
+        if (dests->local) {
+                tipc_loopback_trace(net, &localq);
                 tipc_sk_mcast_rcv(net, &localq, &inputq);
+        }
 exit:
         /* This queue should normally be empty by now */
         __skb_queue_purge(pkts);
diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index a809c0ec8d15..0214aa1c4427 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -389,6 +389,11 @@ int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
                 dev_put(dev);
                 return -EINVAL;
         }
+        if (dev == net->loopback_dev) {
+                dev_put(dev);
+                pr_info("Enabling <%s> not permitted\n", b->name);
+                return -EINVAL;
+        }
 
         /* Autoconfigure own node identity if needed */
         if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) {
@@ -674,6 +679,65 @@ void tipc_bearer_stop(struct net *net)
         }
 }
 
+void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts)
+{
+        struct net_device *dev = net->loopback_dev;
+        struct sk_buff *skb, *_skb;
+        int exp;
+
+        skb_queue_walk(pkts, _skb) {
+                skb = pskb_copy(_skb, GFP_ATOMIC);
+                if (!skb)
+                        continue;
+
+                exp = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
+                if (exp > 0 && pskb_expand_head(skb, exp, 0, GFP_ATOMIC)) {
+                        kfree_skb(skb);
+                        continue;
+                }
+
+                skb_reset_network_header(skb);
+                dev_hard_header(skb, dev, ETH_P_TIPC, dev->dev_addr,
+                                dev->dev_addr, skb->len);
+                skb->dev = dev;
+                skb->pkt_type = PACKET_HOST;
+                skb->ip_summed = CHECKSUM_UNNECESSARY;
+                skb->protocol = eth_type_trans(skb, dev);
+                netif_rx_ni(skb);
+        }
+}
+
+static int tipc_loopback_rcv_pkt(struct sk_buff *skb, struct net_device *dev,
+                                 struct packet_type *pt, struct net_device *od)
+{
+        consume_skb(skb);
+        return NET_RX_SUCCESS;
+}
+
+int tipc_attach_loopback(struct net *net)
+{
+        struct net_device *dev = net->loopback_dev;
+        struct tipc_net *tn = tipc_net(net);
+
+        if (!dev)
+                return -ENODEV;
+
+        dev_hold(dev);
+        tn->loopback_pt.dev = dev;
+        tn->loopback_pt.type = htons(ETH_P_TIPC);
+        tn->loopback_pt.func = tipc_loopback_rcv_pkt;
+        dev_add_pack(&tn->loopback_pt);
+        return 0;
+}
+
+void tipc_detach_loopback(struct net *net)
+{
+        struct tipc_net *tn = tipc_net(net);
+
+        dev_remove_pack(&tn->loopback_pt);
+        dev_put(net->loopback_dev);
+}
+
 /* Caller should hold rtnl_lock to protect the bearer */
 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
                                 struct tipc_bearer *bearer, int nlflags)
diff --git a/net/tipc/bearer.h b/net/tipc/bearer.h
index 7f4c569594a5..ea0f3c49cbed 100644
--- a/net/tipc/bearer.h
+++ b/net/tipc/bearer.h
@@ -232,6 +232,16 @@ void tipc_bearer_xmit(struct net *net, u32 bearer_id,
                       struct tipc_media_addr *dst);
 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
                          struct sk_buff_head *xmitq);
+void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts);
+int tipc_attach_loopback(struct net *net);
+void tipc_detach_loopback(struct net *net);
+
+static inline void tipc_loopback_trace(struct net *net,
+                                       struct sk_buff_head *pkts)
+{
+        if (unlikely(dev_nit_active(net->loopback_dev)))
+                tipc_clone_to_loopback(net, pkts);
+}
 
 /* check if device MTU is too low for tipc headers */
 static inline bool tipc_mtu_bad(struct net_device *dev, unsigned int reserve)
diff --git a/net/tipc/core.c b/net/tipc/core.c
index c8370722f0bb..23cb379a93d6 100644
--- a/net/tipc/core.c
+++ b/net/tipc/core.c
@@ -82,6 +82,10 @@ static int __net_init tipc_init_net(struct net *net)
         if (err)
                 goto out_bclink;
 
+        err = tipc_attach_loopback(net);
+        if (err)
+                goto out_bclink;
+
         return 0;
 
 out_bclink:
@@ -94,6 +98,7 @@ out_sk_rht:
 
 static void __net_exit tipc_exit_net(struct net *net)
 {
+        tipc_detach_loopback(net);
         tipc_net_stop(net);
         tipc_bcast_stop(net);
         tipc_nametbl_stop(net);
diff --git a/net/tipc/core.h b/net/tipc/core.h
index 7a68e1b6a066..60d829581068 100644
--- a/net/tipc/core.h
+++ b/net/tipc/core.h
@@ -125,6 +125,9 @@ struct tipc_net {
 
         /* Cluster capabilities */
         u16 capabilities;
+
+        /* Tracing of node internal messages */
+        struct packet_type loopback_pt;
 };
 
 static inline struct tipc_net *tipc_net(struct net *net)
diff --git a/net/tipc/node.c b/net/tipc/node.c
index 7ca019001f7c..1bdcf0fc1a4d 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -1443,6 +1443,7 @@ int tipc_node_xmit(struct net *net, struct sk_buff_head *list,
         int rc;
 
         if (in_own_node(net, dnode)) {
+                tipc_loopback_trace(net, list);
                 tipc_sk_rcv(net, list);
                 return 0;
         }
diff --git a/net/tipc/topsrv.c b/net/tipc/topsrv.c
index ca8ac96d22a9..3a12fc18239b 100644
--- a/net/tipc/topsrv.c
+++ b/net/tipc/topsrv.c
@@ -40,6 +40,7 @@
 #include "socket.h"
 #include "addr.h"
 #include "msg.h"
+#include "bearer.h"
 #include <net/sock.h>
 #include <linux/module.h>
 
@@ -608,6 +609,7 @@ static void tipc_topsrv_kern_evt(struct net *net, struct tipc_event *evt)
         memcpy(msg_data(buf_msg(skb)), evt, sizeof(*evt));
         skb_queue_head_init(&evtq);
         __skb_queue_tail(&evtq, skb);
+        tipc_loopback_trace(net, &evtq);
         tipc_sk_rcv(net, &evtq);
 }