[PATCH 09/11] rxrpc: Add /proc/net/rxrpc_peers to display the known remote endpoints

[David Howells]

Add /proc/net/rxrpc_peers to display the remote endpoint records that are
resident in the peer cache.

Signed-off-by: David Howells <dhowe...@redhat.com>
---

 net/rxrpc/af_rxrpc.c    |    3 +++
 net/rxrpc/peer-object.c |   32 ++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index 5f0ffb5f8306..b1849c4e3fd3 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -845,6 +845,8 @@ static int __init af_rxrpc_init(void)
                    &rxrpc_connection_seq_fops);
        proc_create_data("rxrpc_locals", 0, init_net.proc_net,
                         &objcache_seq_fops, &rxrpc_local_cache);
+       proc_create_data("rxrpc_peers", 0, init_net.proc_net,
+                        &objcache_seq_fops, &rxrpc_peer_cache);
 #endif
        return 0;
 
@@ -887,6 +889,7 @@ static void __exit af_rxrpc_exit(void)
 
        _debug("flush scheduled work");
        flush_workqueue(rxrpc_workqueue);
+       remove_proc_entry("rxrpc_peers", init_net.proc_net);
        remove_proc_entry("rxrpc_locals", init_net.proc_net);
        remove_proc_entry("rxrpc_conns", init_net.proc_net);
        remove_proc_entry("rxrpc_calls", init_net.proc_net);
diff --git a/net/rxrpc/peer-object.c b/net/rxrpc/peer-object.c
index 35157c659bf7..2dd8c241302d 100644
--- a/net/rxrpc/peer-object.c
+++ b/net/rxrpc/peer-object.c
@@ -21,6 +21,7 @@
 #include <net/route.h>
 #include "ar-internal.h"
 
+static int rxrpc_peer_seq_show(struct seq_file *, void *);
 static unsigned long rxrpc_peer_hash_key(const void *);
 static int rxrpc_peer_cmp_key(const struct obj_node *, const void *);
 static void rxrpc_peer_gc_rcu(struct rcu_head *);
@@ -29,6 +30,7 @@ static struct hlist_head rxrpc_peer_cache_hash[256];
 
 struct objcache rxrpc_peer_cache = {
        .name           = "peers",
+       .seq_show       = rxrpc_peer_seq_show,
        .gc_rcu         = rxrpc_peer_gc_rcu,
        .hash_key       = rxrpc_peer_hash_key,
        .cmp_key        = rxrpc_peer_cmp_key,
@@ -261,3 +263,33 @@ struct rxrpc_peer *rxrpc_lookup_peer(struct sockaddr_rxrpc 
*srx, gfp_t gfp)
        _leave(" = %p {u=%d}", peer, usage);
        return peer;
 }
+
+/*
+ * Display a remote endpoint in /proc/net/rxrpc_peers.
+ */
+static int rxrpc_peer_seq_show(struct seq_file *seq, void *v)
+{
+       struct rxrpc_peer *peer;
+
+       if (v == SEQ_START_TOKEN) {
+               seq_puts(seq, "Use SvID Proto MTU   RTT   RPort Remote\n");
+               return 0;
+       }
+
+       peer = hlist_entry(v, struct rxrpc_peer, obj.link);
+
+       switch (peer->srx.transport.family) {
+       case AF_INET:
+               seq_printf(seq,
+                          "%3d %4x UDP   %5u %5lu %5hu %pI4\n",
+                          atomic_read(&peer->obj.usage),
+                          peer->srx.srx_service,
+                          peer->mtu,
+                          peer->rtt,
+                          ntohs(peer->srx.transport.sin.sin_port),
+                          &peer->srx.transport.sin.sin_addr);
+               break;
+       }
+
+       return 0;
+}