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Subject[PATCH net-next] rxrpc: Add /proc/net/rxrpc/peers to display peer list
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Add /proc/net/rxrpc/peers to display the list of peers currently active.

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

net/rxrpc/ar-internal.h | 1
net/rxrpc/net_ns.c | 3 +
net/rxrpc/proc.c | 126 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 130 insertions(+)

diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index 8cee7644965c..0a7c49e8e053 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -1062,6 +1062,7 @@ void rxrpc_put_peer(struct rxrpc_peer *);
*/
extern const struct seq_operations rxrpc_call_seq_ops;
extern const struct seq_operations rxrpc_connection_seq_ops;
+extern const struct seq_operations rxrpc_peer_seq_ops;

/*
* recvmsg.c
diff --git a/net/rxrpc/net_ns.c b/net/rxrpc/net_ns.c
index 417d80867c4f..fd7eba8467fa 100644
--- a/net/rxrpc/net_ns.c
+++ b/net/rxrpc/net_ns.c
@@ -102,6 +102,9 @@ static __net_init int rxrpc_init_net(struct net *net)
proc_create_net("conns", 0444, rxnet->proc_net,
&rxrpc_connection_seq_ops,
sizeof(struct seq_net_private));
+ proc_create_net("peers", 0444, rxnet->proc_net,
+ &rxrpc_peer_seq_ops,
+ sizeof(struct seq_net_private));
return 0;

err_proc:
diff --git a/net/rxrpc/proc.c b/net/rxrpc/proc.c
index 9805e3b85c36..c7d976859d40 100644
--- a/net/rxrpc/proc.c
+++ b/net/rxrpc/proc.c
@@ -212,3 +212,129 @@ const struct seq_operations rxrpc_connection_seq_ops = {
.stop = rxrpc_connection_seq_stop,
.show = rxrpc_connection_seq_show,
};
+
+/*
+ * generate a list of extant virtual peers in /proc/net/rxrpc/peers
+ */
+static int rxrpc_peer_seq_show(struct seq_file *seq, void *v)
+{
+ struct rxrpc_peer *peer;
+ time64_t now;
+ char lbuff[50], rbuff[50];
+
+ if (v == SEQ_START_TOKEN) {
+ seq_puts(seq,
+ "Proto Local "
+ " Remote "
+ " Use CW MTU LastUse RTT Rc\n"
+ );
+ return 0;
+ }
+
+ peer = list_entry(v, struct rxrpc_peer, hash_link);
+
+ sprintf(lbuff, "%pISpc", &peer->local->srx.transport);
+
+ sprintf(rbuff, "%pISpc", &peer->srx.transport);
+
+ now = ktime_get_seconds();
+ seq_printf(seq,
+ "UDP %-47.47s %-47.47s %3u"
+ " %3u %5u %6llus %12llu %2u\n",
+ lbuff,
+ rbuff,
+ atomic_read(&peer->usage),
+ peer->cong_cwnd,
+ peer->mtu,
+ now - peer->last_tx_at,
+ peer->rtt,
+ peer->rtt_cursor);
+
+ return 0;
+}
+
+static void *rxrpc_peer_seq_start(struct seq_file *seq, loff_t *_pos)
+ __acquires(rcu)
+{
+ struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
+ unsigned int bucket, n;
+ unsigned int shift = 32 - HASH_BITS(rxnet->peer_hash);
+ void *p;
+
+ rcu_read_lock();
+
+ if (*_pos >= UINT_MAX)
+ return NULL;
+
+ n = *_pos & ((1U << shift) - 1);
+ bucket = *_pos >> shift;
+ for (;;) {
+ if (bucket >= HASH_SIZE(rxnet->peer_hash)) {
+ *_pos = UINT_MAX;
+ return NULL;
+ }
+ if (n == 0) {
+ if (bucket == 0)
+ return SEQ_START_TOKEN;
+ *_pos += 1;
+ n++;
+ }
+
+ p = seq_hlist_start_rcu(&rxnet->peer_hash[bucket], n - 1);
+ if (p)
+ return p;
+ bucket++;
+ n = 1;
+ *_pos = (bucket << shift) | n;
+ }
+}
+
+static void *rxrpc_peer_seq_next(struct seq_file *seq, void *v, loff_t *_pos)
+{
+ struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
+ unsigned int bucket, n;
+ unsigned int shift = 32 - HASH_BITS(rxnet->peer_hash);
+ void *p;
+
+ if (*_pos >= UINT_MAX)
+ return NULL;
+
+ bucket = *_pos >> shift;
+
+ p = seq_hlist_next_rcu(v, &rxnet->peer_hash[bucket], _pos);
+ if (p)
+ return p;
+
+ for (;;) {
+ bucket++;
+ n = 1;
+ *_pos = (bucket << shift) | n;
+
+ if (bucket >= HASH_SIZE(rxnet->peer_hash)) {
+ *_pos = UINT_MAX;
+ return NULL;
+ }
+ if (n == 0) {
+ *_pos += 1;
+ n++;
+ }
+
+ p = seq_hlist_start_rcu(&rxnet->peer_hash[bucket], n - 1);
+ if (p)
+ return p;
+ }
+}
+
+static void rxrpc_peer_seq_stop(struct seq_file *seq, void *v)
+ __releases(rcu)
+{
+ rcu_read_unlock();
+}
+
+
+const struct seq_operations rxrpc_peer_seq_ops = {
+ .start = rxrpc_peer_seq_start,
+ .next = rxrpc_peer_seq_next,
+ .stop = rxrpc_peer_seq_stop,
+ .show = rxrpc_peer_seq_show,
+};
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