aboutsummaryrefslogtreecommitdiff
path: root/net/rxrpc
diff options
context:
space:
mode:
authorDavid Howells <dhowells@redhat.com>2018-09-27 15:13:09 +0100
committerDavid Howells <dhowells@redhat.com>2018-09-28 10:32:49 +0100
commit0099dc589bfa7caf6f2608c4cbc1181cfee22b0c (patch)
treefd071d7aab3762ba2ab377892cb4c250923d50b8 /net/rxrpc
parent403fc2a138457f1071b186786a7589ef7382c8bc (diff)
downloadlinux-stericsson-0099dc589bfa7caf6f2608c4cbc1181cfee22b0c.tar.gz
rxrpc: Make service call handling more robust
Make the following changes to improve the robustness of the code that sets up a new service call: (1) Cache the rxrpc_sock struct obtained in rxrpc_data_ready() to do a service ID check and pass that along to rxrpc_new_incoming_call(). This means that I can remove the check from rxrpc_new_incoming_call() without the need to worry about the socket attached to the local endpoint getting replaced - which would invalidate the check. (2) Cache the rxrpc_peer struct, thereby allowing the peer search to be done once. The peer is passed to rxrpc_new_incoming_call(), thereby saving the need to repeat the search. This also reduces the possibility of rxrpc_publish_service_conn() BUG()'ing due to the detection of a duplicate connection, despite the initial search done by rxrpc_find_connection_rcu() having turned up nothing. This BUG() shouldn't ever get hit since rxrpc_data_ready() *should* be non-reentrant and the result of the initial search should still hold true, but it has proven possible to hit. I *think* this may be due to __rxrpc_lookup_peer_rcu() cutting short the iteration over the hash table if it finds a matching peer with a zero usage count, but I don't know for sure since it's only ever been hit once that I know of. Another possibility is that a bug in rxrpc_data_ready() that checked the wrong byte in the header for the RXRPC_CLIENT_INITIATED flag might've let through a packet that caused a spurious and invalid call to be set up. That is addressed in another patch. (3) Fix __rxrpc_lookup_peer_rcu() to skip peer records that have a zero usage count rather than stopping and returning not found, just in case there's another peer record behind it in the bucket. (4) Don't search the peer records in rxrpc_alloc_incoming_call(), but rather either use the peer cached in (2) or, if one wasn't found, preemptively install a new one. Fixes: 8496af50eb38 ("rxrpc: Use RCU to access a peer's service connection tree") Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net/rxrpc')
-rw-r--r--net/rxrpc/ar-internal.h8
-rw-r--r--net/rxrpc/call_accept.c41
-rw-r--r--net/rxrpc/conn_object.c7
-rw-r--r--net/rxrpc/input.c7
-rw-r--r--net/rxrpc/peer_object.c35
5 files changed, 38 insertions, 60 deletions
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index e8861cb78070..c72686193d83 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -722,6 +722,8 @@ extern struct workqueue_struct *rxrpc_workqueue;
int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
void rxrpc_discard_prealloc(struct rxrpc_sock *);
struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *,
+ struct rxrpc_sock *,
+ struct rxrpc_peer *,
struct rxrpc_connection *,
struct sk_buff *);
void rxrpc_accept_incoming_calls(struct rxrpc_local *);
@@ -913,7 +915,8 @@ extern unsigned int rxrpc_closed_conn_expiry;
struct rxrpc_connection *rxrpc_alloc_connection(gfp_t);
struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
- struct sk_buff *);
+ struct sk_buff *,
+ struct rxrpc_peer **);
void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
void rxrpc_disconnect_call(struct rxrpc_call *);
void rxrpc_kill_connection(struct rxrpc_connection *);
@@ -1049,8 +1052,7 @@ struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *,
struct sockaddr_rxrpc *, gfp_t);
struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
-struct rxrpc_peer *rxrpc_lookup_incoming_peer(struct rxrpc_local *,
- struct rxrpc_peer *);
+void rxrpc_new_incoming_peer(struct rxrpc_local *, struct rxrpc_peer *);
void rxrpc_destroy_all_peers(struct rxrpc_net *);
struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *);
struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *);
diff --git a/net/rxrpc/call_accept.c b/net/rxrpc/call_accept.c
index e88f131c1d7f..9c7f26d06a52 100644
--- a/net/rxrpc/call_accept.c
+++ b/net/rxrpc/call_accept.c
@@ -249,11 +249,11 @@ void rxrpc_discard_prealloc(struct rxrpc_sock *rx)
*/
static struct rxrpc_call *rxrpc_alloc_incoming_call(struct rxrpc_sock *rx,
struct rxrpc_local *local,
+ struct rxrpc_peer *peer,
struct rxrpc_connection *conn,
struct sk_buff *skb)
{
struct rxrpc_backlog *b = rx->backlog;
- struct rxrpc_peer *peer, *xpeer;
struct rxrpc_call *call;
unsigned short call_head, conn_head, peer_head;
unsigned short call_tail, conn_tail, peer_tail;
@@ -276,21 +276,18 @@ static struct rxrpc_call *rxrpc_alloc_incoming_call(struct rxrpc_sock *rx,
return NULL;
if (!conn) {
- /* No connection. We're going to need a peer to start off
- * with. If one doesn't yet exist, use a spare from the
- * preallocation set. We dump the address into the spare in
- * anticipation - and to save on stack space.
- */
- xpeer = b->peer_backlog[peer_tail];
- if (rxrpc_extract_addr_from_skb(local, &xpeer->srx, skb) < 0)
- return NULL;
-
- peer = rxrpc_lookup_incoming_peer(local, xpeer);
- if (peer == xpeer) {
+ if (peer && !rxrpc_get_peer_maybe(peer))
+ peer = NULL;
+ if (!peer) {
+ peer = b->peer_backlog[peer_tail];
+ if (rxrpc_extract_addr_from_skb(local, &peer->srx, skb) < 0)
+ return NULL;
b->peer_backlog[peer_tail] = NULL;
smp_store_release(&b->peer_backlog_tail,
(peer_tail + 1) &
(RXRPC_BACKLOG_MAX - 1));
+
+ rxrpc_new_incoming_peer(local, peer);
}
/* Now allocate and set up the connection */
@@ -335,30 +332,16 @@ static struct rxrpc_call *rxrpc_alloc_incoming_call(struct rxrpc_sock *rx,
* The call is returned with the user access mutex held.
*/
struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *local,
+ struct rxrpc_sock *rx,
+ struct rxrpc_peer *peer,
struct rxrpc_connection *conn,
struct sk_buff *skb)
{
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
- struct rxrpc_sock *rx;
struct rxrpc_call *call;
- u16 service_id = sp->hdr.serviceId;
_enter("");
- /* Get the socket providing the service */
- rx = rcu_dereference(local->service);
- if (rx && (service_id == rx->srx.srx_service ||
- service_id == rx->second_service))
- goto found_service;
-
- trace_rxrpc_abort(0, "INV", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
- RX_INVALID_OPERATION, EOPNOTSUPP);
- skb->mark = RXRPC_SKB_MARK_REJECT_ABORT;
- skb->priority = RX_INVALID_OPERATION;
- _leave(" = NULL [service]");
- return NULL;
-
-found_service:
spin_lock(&rx->incoming_lock);
if (rx->sk.sk_state == RXRPC_SERVER_LISTEN_DISABLED ||
rx->sk.sk_state == RXRPC_CLOSE) {
@@ -371,7 +354,7 @@ found_service:
goto out;
}
- call = rxrpc_alloc_incoming_call(rx, local, conn, skb);
+ call = rxrpc_alloc_incoming_call(rx, local, peer, conn, skb);
if (!call) {
skb->mark = RXRPC_SKB_MARK_REJECT_BUSY;
_leave(" = NULL [busy]");
diff --git a/net/rxrpc/conn_object.c b/net/rxrpc/conn_object.c
index 390ba50cfab4..b4438f98dc5c 100644
--- a/net/rxrpc/conn_object.c
+++ b/net/rxrpc/conn_object.c
@@ -69,10 +69,14 @@ struct rxrpc_connection *rxrpc_alloc_connection(gfp_t gfp)
* If successful, a pointer to the connection is returned, but no ref is taken.
* NULL is returned if there is no match.
*
+ * When searching for a service call, if we find a peer but no connection, we
+ * return that through *_peer in case we need to create a new service call.
+ *
* The caller must be holding the RCU read lock.
*/
struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *local,
- struct sk_buff *skb)
+ struct sk_buff *skb,
+ struct rxrpc_peer **_peer)
{
struct rxrpc_connection *conn;
struct rxrpc_conn_proto k;
@@ -104,6 +108,7 @@ struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *local,
peer = rxrpc_lookup_peer_rcu(local, &srx);
if (!peer)
goto not_found;
+ *_peer = peer;
conn = rxrpc_find_service_conn_rcu(peer, skb);
if (!conn || atomic_read(&conn->usage) == 0)
goto not_found;
diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index a569e9e010d1..800f5b8a1baa 100644
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -1128,7 +1128,8 @@ void rxrpc_data_ready(struct sock *udp_sk)
struct rxrpc_call *call = NULL;
struct rxrpc_skb_priv *sp;
struct rxrpc_local *local = udp_sk->sk_user_data;
- struct rxrpc_sock *rx;
+ struct rxrpc_peer *peer = NULL;
+ struct rxrpc_sock *rx = NULL;
struct sk_buff *skb;
unsigned int channel;
int ret, skew = 0;
@@ -1250,7 +1251,7 @@ void rxrpc_data_ready(struct sock *udp_sk)
}
}
- conn = rxrpc_find_connection_rcu(local, skb);
+ conn = rxrpc_find_connection_rcu(local, skb, &peer);
if (conn) {
if (sp->hdr.securityIndex != conn->security_ix)
goto wrong_security;
@@ -1339,7 +1340,7 @@ void rxrpc_data_ready(struct sock *udp_sk)
goto bad_message_unlock;
if (sp->hdr.seq != 1)
goto discard_unlock;
- call = rxrpc_new_incoming_call(local, conn, skb);
+ call = rxrpc_new_incoming_call(local, rx, peer, conn, skb);
if (!call) {
rcu_read_unlock();
goto reject_packet;
diff --git a/net/rxrpc/peer_object.c b/net/rxrpc/peer_object.c
index 1dc7648e3eff..70083e8fb6e5 100644
--- a/net/rxrpc/peer_object.c
+++ b/net/rxrpc/peer_object.c
@@ -124,11 +124,9 @@ static struct rxrpc_peer *__rxrpc_lookup_peer_rcu(
struct rxrpc_net *rxnet = local->rxnet;
hash_for_each_possible_rcu(rxnet->peer_hash, peer, hash_link, hash_key) {
- if (rxrpc_peer_cmp_key(peer, local, srx, hash_key) == 0) {
- if (atomic_read(&peer->usage) == 0)
- return NULL;
+ if (rxrpc_peer_cmp_key(peer, local, srx, hash_key) == 0 &&
+ atomic_read(&peer->usage) > 0)
return peer;
- }
}
return NULL;
@@ -299,34 +297,23 @@ static struct rxrpc_peer *rxrpc_create_peer(struct rxrpc_local *local,
}
/*
- * Set up a new incoming peer. The address is prestored in the preallocated
- * peer.
+ * Set up a new incoming peer. There shouldn't be any other matching peers
+ * since we've already done a search in the list from the non-reentrant context
+ * (the data_ready handler) that is the only place we can add new peers.
*/
-struct rxrpc_peer *rxrpc_lookup_incoming_peer(struct rxrpc_local *local,
- struct rxrpc_peer *prealloc)
+void rxrpc_new_incoming_peer(struct rxrpc_local *local, struct rxrpc_peer *peer)
{
- struct rxrpc_peer *peer;
struct rxrpc_net *rxnet = local->rxnet;
unsigned long hash_key;
- hash_key = rxrpc_peer_hash_key(local, &prealloc->srx);
- prealloc->local = local;
- rxrpc_init_peer(prealloc, hash_key);
+ hash_key = rxrpc_peer_hash_key(local, &peer->srx);
+ peer->local = local;
+ rxrpc_init_peer(peer, hash_key);
spin_lock(&rxnet->peer_hash_lock);
-
- /* Need to check that we aren't racing with someone else */
- peer = __rxrpc_lookup_peer_rcu(local, &prealloc->srx, hash_key);
- if (peer && !rxrpc_get_peer_maybe(peer))
- peer = NULL;
- if (!peer) {
- peer = prealloc;
- hash_add_rcu(rxnet->peer_hash, &peer->hash_link, hash_key);
- list_add_tail(&peer->keepalive_link, &rxnet->peer_keepalive_new);
- }
-
+ hash_add_rcu(rxnet->peer_hash, &peer->hash_link, hash_key);
+ list_add_tail(&peer->keepalive_link, &rxnet->peer_keepalive_new);
spin_unlock(&rxnet->peer_hash_lock);
- return peer;
}
/*