sctp: Add RCU protection to assoc->transport_addr_list

peer.transport_addr_list is currently only protected by sk_sock
which is inpractical to acquire for procfs dumping purposes.

This patch adds RCU protection allowing for the procfs readers to
enter RCU read-side critical sections.

Modification of the list continues to be serialized via sk_lock.

V2: Use list_del_rcu() in sctp_association_free() to be safe
    Skip transports marked dead when dumping for procfs

Cc: Vlad Yasevich <vyasevich@gmail.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 30 insertions, 10 deletions

diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index c2521016d64..fdeb85a970f 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -949,6 +949,8 @@ struct sctp_transport {
 
         /* 64-bit random number sent with heartbeat. */
         __u64 hb_nonce;
+
+        struct rcu_head rcu;
 };
 
 struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *,
diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index ba3f9cc4c04..b45ed1f9692 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -448,7 +448,7 @@ void sctp_association_free(struct sctp_association *asoc)
         /* Release the transport structures. */
         list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
                 transport = list_entry(pos, struct sctp_transport, transports);
-                list_del(pos);
+                list_del_rcu(pos);
                 sctp_transport_free(transport);
         }
 
@@ -568,7 +568,7 @@ void sctp_assoc_rm_peer(struct sctp_association *asoc,
                 sctp_assoc_update_retran_path(asoc);
 
         /* Remove this peer from the list. */
-        list_del(&peer->transports);
+        list_del_rcu(&peer->transports);
 
         /* Get the first transport of asoc. */
         pos = asoc->peer.transport_addr_list.next;
@@ -769,7 +769,7 @@ struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc,
         peer->state = peer_state;
 
         /* Attach the remote transport to our asoc.  */
-        list_add_tail(&peer->transports, &asoc->peer.transport_addr_list);
+        list_add_tail_rcu(&peer->transports, &asoc->peer.transport_addr_list);
         asoc->peer.transport_count++;
 
         /* If we do not yet have a primary path, set one.  */
diff --git a/net/sctp/proc.c b/net/sctp/proc.c
index 06b05ee17d8..8c19e97262c 100644
--- a/net/sctp/proc.c
+++ b/net/sctp/proc.c
@@ -162,15 +162,20 @@ static void sctp_seq_dump_remote_addrs(struct seq_file *seq, struct sctp_associa
         struct sctp_af *af;
 
         primary = &assoc->peer.primary_addr;
-        list_for_each_entry(transport, &assoc->peer.transport_addr_list,
+        rcu_read_lock();
+        list_for_each_entry_rcu(transport, &assoc->peer.transport_addr_list,
                         transports) {
                 addr = &transport->ipaddr;
+                if (transport->dead)
+                        continue;
+
                 af = sctp_get_af_specific(addr->sa.sa_family);
                 if (af->cmp_addr(addr, primary)) {
                         seq_printf(seq, "*");
                 }
                 af->seq_dump_addr(seq, addr);
         }
+        rcu_read_unlock();
 }
 
 static void * sctp_eps_seq_start(struct seq_file *seq, loff_t *pos)
@@ -441,12 +446,16 @@ static int sctp_remaddr_seq_show(struct seq_file *seq, void *v)
         head = &sctp_assoc_hashtable[hash];
         sctp_local_bh_disable();
         read_lock(&head->lock);
+        rcu_read_lock();
         sctp_for_each_hentry(epb, node, &head->chain) {
                 if (!net_eq(sock_net(epb->sk), seq_file_net(seq)))
                         continue;
                 assoc = sctp_assoc(epb);
-                list_for_each_entry(tsp, &assoc->peer.transport_addr_list,
+                list_for_each_entry_rcu(tsp, &assoc->peer.transport_addr_list,
                                         transports) {
+                        if (tsp->dead)
+                                continue;
+
                         /*
                          * The remote address (ADDR)
                          */
@@ -492,6 +501,7 @@ static int sctp_remaddr_seq_show(struct seq_file *seq, void *v)
                 }
         }
 
+        rcu_read_unlock();
         read_unlock(&head->lock);
         sctp_local_bh_enable();
 
diff --git a/net/sctp/transport.c b/net/sctp/transport.c
index 310f11eb220..4e45bb68aef 100644
--- a/net/sctp/transport.c
+++ b/net/sctp/transport.c
@@ -163,13 +163,11 @@ void sctp_transport_free(struct sctp_transport *transport)
         sctp_transport_put(transport);
 }
 
-/* Destroy the transport data structure.
- * Assumes there are no more users of this structure.
- */
-static void sctp_transport_destroy(struct sctp_transport *transport)
+static void sctp_transport_destroy_rcu(struct rcu_head *head)
 {
-        SCTP_ASSERT(transport->dead, "Transport is not dead", return);
+        struct sctp_transport *transport;
 
+        transport = container_of(head, struct sctp_transport, rcu);
         if (transport->asoc)
                 sctp_association_put(transport->asoc);
 
@@ -180,6 +178,16 @@ static void sctp_transport_destroy(struct sctp_transport *transport)
         SCTP_DBG_OBJCNT_DEC(transport);
 }
 
+/* Destroy the transport data structure.
+ * Assumes there are no more users of this structure.
+ */
+static void sctp_transport_destroy(struct sctp_transport *transport)
+{
+        SCTP_ASSERT(transport->dead, "Transport is not dead", return);
+
+        call_rcu(&transport->rcu, sctp_transport_destroy_rcu);
+}
+
 /* Start T3_rtx timer if it is not already running and update the heartbeat
  * timer.  This routine is called every time a DATA chunk is sent.
  */