[PATCH 05/11] rxrpc: procfs file to list local endpoints

[David Howells]

Add a proc file to list local rxrpc endpoints using the object cache
facility to do much of the work.

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

 net/rxrpc/af_rxrpc.c     |    3 +++
 net/rxrpc/local-object.c |   29 +++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index a27d8e3ef854..23ebb127cac1 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -842,6 +842,8 @@ static int __init af_rxrpc_init(void)
        proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops);
        proc_create("rxrpc_conns", 0, init_net.proc_net,
                    &rxrpc_connection_seq_fops);
+       proc_create_data("rxrpc_locals", 0, init_net.proc_net,
+                        &objcache_seq_fops, &rxrpc_local_cache);
 #endif
        return 0;
 
@@ -883,6 +885,7 @@ static void __exit af_rxrpc_exit(void)
 
        _debug("flush scheduled work");
        flush_workqueue(rxrpc_workqueue);
+       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);
        destroy_workqueue(rxrpc_workqueue);
diff --git a/net/rxrpc/local-object.c b/net/rxrpc/local-object.c
index 4f44e86e70fe..cc6354675026 100644
--- a/net/rxrpc/local-object.c
+++ b/net/rxrpc/local-object.c
@@ -19,6 +19,7 @@
 #include <net/af_rxrpc.h>
 #include "ar-internal.h"
 
+static int rxrpc_local_seq_show(struct seq_file *, void *);
 static void rxrpc_local_prepare_for_gc(struct obj_node *);
 static void rxrpc_local_gc_rcu(struct rcu_head *);
 static unsigned long rxrpc_local_hash_key(const void *);
@@ -29,6 +30,7 @@ static struct hlist_head rxrpc_local_cache_hash[16];
 
 struct objcache rxrpc_local_cache = {
        .name           = "locals",
+       .seq_show       = rxrpc_local_seq_show,
        .prepare_for_gc = rxrpc_local_prepare_for_gc,
        .gc_rcu         = rxrpc_local_gc_rcu,
        .hash_key       = rxrpc_local_hash_key,
@@ -309,3 +311,30 @@ static void rxrpc_local_gc_rcu(struct rcu_head *rcu)
        objcache_obj_rcu_done(&rxrpc_local_cache);
        _leave("");
 }
+
+/*
+ * Display a local endpoint in /proc/net/rxrpc_locals.
+ */
+static int rxrpc_local_seq_show(struct seq_file *seq, void *v)
+{
+       struct rxrpc_local *local;
+
+       if (v == SEQ_START_TOKEN) {
+               seq_puts(seq, "Use Proto LPort Local\n");
+               return 0;
+       }
+
+       local = hlist_entry(v, struct rxrpc_local, obj.link);
+
+       switch (local->srx.transport.family) {
+       case AF_INET:
+               seq_printf(seq,
+                          "%3d UDP   %5hu %pI4\n",
+                          atomic_read(&local->obj.usage),
+                          ntohs(local->srx.transport.sin.sin_port),
+                          &local->srx.transport.sin.sin_addr);
+               break;
+       }
+
+       return 0;
+}