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RxRPC development 

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Merge tag 'rxrpc-next-20180330' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs

David Howells says:

====================
rxrpc: Fixes and more traces

Here are some patches that add some more tracepoints to AF_RXRPC and fix
some issues therein:

 (1) Fix the use of VERSION packets to keep firewall routes open.

 (2) Fix the incorrect current time usage in a tracepoint.

 (3) Fix Tx ring annotation corruption.

 (4) Fix accidental conversion of call-level abort into connection-level
     abort.

 (5) Fix calculation of resend time.

 (6) Remove a couple of unused variables.

 (7) Fix a bunch of checker warnings and an error.  Note that not all
     warnings can be quashed as checker doesn't seem to correctly handle
     seqlocks.

 (8) Fix a potential race between call destruction and socket/net
     destruction.

 (9) Add a tracepoint to track rxrpc_local refcounting.

(10) Fix an apparent leak of rxrpc_local objects.

(11) Add a tracepoint to track rxrpc_peer refcounting.

(12) Fix a leak of rxrpc_peer objects.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2018-03-31 22:29:12 -04:00
parent 3be9b5fdc6 17226f1240
commit e2e80c027f
20 changed files with 511 additions and 73 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

85
include/trace/events/rxrpc.h
View File

@ -42,6 +42,22 @@ enum rxrpc_skb_trace {
rxrpc_skb_tx_seen,
};
enum rxrpc_local_trace {
rxrpc_local_got,
rxrpc_local_new,
rxrpc_local_processing,
rxrpc_local_put,
rxrpc_local_queued,
};
enum rxrpc_peer_trace {
rxrpc_peer_got,
rxrpc_peer_new,
rxrpc_peer_processing,
rxrpc_peer_put,
rxrpc_peer_queued_error,
};
enum rxrpc_conn_trace {
rxrpc_conn_got,
rxrpc_conn_new_client,
@ -215,6 +231,20 @@ enum rxrpc_congest_change {
EM(rxrpc_skb_tx_rotated, "Tx ROT") \
E_(rxrpc_skb_tx_seen, "Tx SEE")
#define rxrpc_local_traces \
EM(rxrpc_local_got, "GOT") \
EM(rxrpc_local_new, "NEW") \
EM(rxrpc_local_processing, "PRO") \
EM(rxrpc_local_put, "PUT") \
E_(rxrpc_local_queued, "QUE")
#define rxrpc_peer_traces \
EM(rxrpc_peer_got, "GOT") \
EM(rxrpc_peer_new, "NEW") \
EM(rxrpc_peer_processing, "PRO") \
EM(rxrpc_peer_put, "PUT") \
E_(rxrpc_peer_queued_error, "QER")
#define rxrpc_conn_traces \
EM(rxrpc_conn_got, "GOT") \
EM(rxrpc_conn_new_client, "NWc") \
@ -416,6 +446,7 @@ enum rxrpc_congest_change {
#define E_(a, b) TRACE_DEFINE_ENUM(a);
rxrpc_skb_traces;
rxrpc_local_traces;
rxrpc_conn_traces;
rxrpc_client_traces;
rxrpc_call_traces;
@ -439,6 +470,60 @@ rxrpc_congest_changes;
#define EM(a, b) { a, b },
#define E_(a, b) { a, b }
TRACE_EVENT(rxrpc_local,
TP_PROTO(struct rxrpc_local *local, enum rxrpc_local_trace op,
int usage, const void *where),
TP_ARGS(local, op, usage, where),
TP_STRUCT__entry(
__field(unsigned int, local )
__field(int, op )
__field(int, usage )
__field(const void *, where )
),
TP_fast_assign(
__entry->local = local->debug_id;
__entry->op = op;
__entry->usage = usage;
__entry->where = where;
),
TP_printk("L=%08x %s u=%d sp=%pSR",
__entry->local,
__print_symbolic(__entry->op, rxrpc_local_traces),
__entry->usage,
__entry->where)
);
TRACE_EVENT(rxrpc_peer,
TP_PROTO(struct rxrpc_peer *peer, enum rxrpc_peer_trace op,
int usage, const void *where),
TP_ARGS(peer, op, usage, where),
TP_STRUCT__entry(
__field(unsigned int, peer )
__field(int, op )
__field(int, usage )
__field(const void *, where )
),
TP_fast_assign(
__entry->peer = peer->debug_id;
__entry->op = op;
__entry->usage = usage;
__entry->where = where;
),
TP_printk("P=%08x %s u=%d sp=%pSR",
__entry->peer,
__print_symbolic(__entry->op, rxrpc_peer_traces),
__entry->usage,
__entry->where)
);
TRACE_EVENT(rxrpc_conn,
TP_PROTO(struct rxrpc_connection *conn, enum rxrpc_conn_trace op,
int usage, const void *where),

6
net/rxrpc/af_rxrpc.c
View File

@ -324,6 +324,7 @@ struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
mutex_unlock(&call->user_mutex);
}
rxrpc_put_peer(cp.peer);
_leave(" = %p", call);
return call;
}
@ -447,6 +448,7 @@ int rxrpc_kernel_retry_call(struct socket *sock, struct rxrpc_call *call,
ret = rxrpc_retry_client_call(rx, call, &cp, srx, GFP_KERNEL);
mutex_unlock(&call->user_mutex);
rxrpc_put_peer(cp.peer);
_leave(" = %d", ret);
return ret;
}
@ -762,6 +764,7 @@ static __poll_t rxrpc_poll(struct file *file, struct socket *sock,
static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
int kern)
{
struct rxrpc_net *rxnet;
struct rxrpc_sock *rx;
struct sock *sk;
@ -801,6 +804,9 @@ static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
rwlock_init(&rx->call_lock);
memset(&rx->srx, 0, sizeof(rx->srx));
rxnet = rxrpc_net(sock_net(&rx->sk));
timer_reduce(&rxnet->peer_keepalive_timer, jiffies + 1);
_leave(" = 0 [%p]", rx);
return 0;
}

68
net/rxrpc/ar-internal.h
View File

@ -75,7 +75,9 @@ struct rxrpc_net {
u32 epoch; /* Local epoch for detecting local-end reset */
struct list_head calls; /* List of calls active in this namespace */
rwlock_t call_lock; /* Lock for ->calls */
atomic_t nr_calls; /* Count of allocated calls */
atomic_t nr_conns;
struct list_head conn_proc_list; /* List of conns in this namespace for proc */
struct list_head service_conns; /* Service conns in this namespace */
rwlock_t conn_lock; /* Lock for ->conn_proc_list, ->service_conns */
@ -97,8 +99,16 @@ struct rxrpc_net {
struct list_head local_endpoints;
struct mutex local_mutex; /* Lock for ->local_endpoints */
spinlock_t peer_hash_lock; /* Lock for ->peer_hash */
DECLARE_HASHTABLE (peer_hash, 10);
spinlock_t peer_hash_lock; /* Lock for ->peer_hash */
#define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */
u8 peer_keepalive_cursor;
ktime_t peer_keepalive_base;
struct hlist_head peer_keepalive[RXRPC_KEEPALIVE_TIME + 1];
struct hlist_head peer_keepalive_new;
struct timer_list peer_keepalive_timer;
struct work_struct peer_keepalive_work;
};
/*
@ -285,6 +295,8 @@ struct rxrpc_peer {
struct hlist_head error_targets; /* targets for net error distribution */
struct work_struct error_distributor;
struct rb_root service_conns; /* Service connections */
struct hlist_node keepalive_link; /* Link in net->peer_keepalive[] */
time64_t last_tx_at; /* Last time packet sent here */
seqlock_t service_conn_lock;
spinlock_t lock; /* access lock */
unsigned int if_mtu; /* interface MTU for this peer */
@ -518,6 +530,7 @@ struct rxrpc_call {
struct rxrpc_connection *conn; /* connection carrying call */
struct rxrpc_peer *peer; /* Peer record for remote address */
struct rxrpc_sock __rcu *socket; /* socket responsible */
struct rxrpc_net *rxnet; /* Network namespace to which call belongs */
struct mutex user_mutex; /* User access mutex */
unsigned long ack_at; /* When deferred ACK needs to happen */
unsigned long ack_lost_at; /* When ACK is figured as lost */
@ -969,31 +982,12 @@ extern void rxrpc_process_local_events(struct rxrpc_local *);
* local_object.c
*/
struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
void __rxrpc_put_local(struct rxrpc_local *);
struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *);
struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *);
void rxrpc_put_local(struct rxrpc_local *);
void rxrpc_queue_local(struct rxrpc_local *);
void rxrpc_destroy_all_locals(struct rxrpc_net *);
static inline void rxrpc_get_local(struct rxrpc_local *local)
{
atomic_inc(&local->usage);
}
static inline
struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *local)
{
return atomic_inc_not_zero(&local->usage) ? local : NULL;
}
static inline void rxrpc_put_local(struct rxrpc_local *local)
{
if (local && atomic_dec_and_test(&local->usage))
__rxrpc_put_local(local);
}
static inline void rxrpc_queue_local(struct rxrpc_local *local)
{
rxrpc_queue_work(&local->processor);
}
/*
* misc.c
*/
@ -1026,6 +1020,7 @@ int rxrpc_send_ack_packet(struct rxrpc_call *, bool, rxrpc_serial_t *);
int rxrpc_send_abort_packet(struct rxrpc_call *);
int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool);
void rxrpc_reject_packets(struct rxrpc_local *);
void rxrpc_send_keepalive(struct rxrpc_peer *);
/*
* peer_event.c
@ -1034,6 +1029,7 @@ void rxrpc_error_report(struct sock *);
void rxrpc_peer_error_distributor(struct work_struct *);
void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace,
rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
void rxrpc_peer_keepalive_worker(struct work_struct *);
/*
* peer_object.c
@ -1045,25 +1041,11 @@ struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *,
struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
struct rxrpc_peer *rxrpc_lookup_incoming_peer(struct rxrpc_local *,
struct rxrpc_peer *);
static inline struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *peer)
{
atomic_inc(&peer->usage);
return peer;
}
static inline
struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *peer)
{
return atomic_inc_not_zero(&peer->usage) ? peer : NULL;
}
extern void __rxrpc_put_peer(struct rxrpc_peer *peer);
static inline void rxrpc_put_peer(struct rxrpc_peer *peer)
{
if (peer && atomic_dec_and_test(&peer->usage))
__rxrpc_put_peer(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 *);
void rxrpc_put_peer(struct rxrpc_peer *);
void __rxrpc_queue_peer_error(struct rxrpc_peer *);
/*
* proc.c

9
net/rxrpc/call_accept.c
View File

@ -138,6 +138,7 @@ static int rxrpc_service_prealloc_one(struct rxrpc_sock *rx,
write_unlock(&rx->call_lock);
rxnet = call->rxnet;
write_lock(&rxnet->call_lock);
list_add_tail(&call->link, &rxnet->calls);
write_unlock(&rxnet->call_lock);
@ -218,6 +219,8 @@ void rxrpc_discard_prealloc(struct rxrpc_sock *rx)
list_del(&conn->proc_link);
write_unlock(&rxnet->conn_lock);
kfree(conn);
if (atomic_dec_and_test(&rxnet->nr_conns))
wake_up_atomic_t(&rxnet->nr_conns);
tail = (tail + 1) & (size - 1);
}
@ -225,7 +228,7 @@ void rxrpc_discard_prealloc(struct rxrpc_sock *rx)
tail = b->call_backlog_tail;
while (CIRC_CNT(head, tail, size) > 0) {
struct rxrpc_call *call = b->call_backlog[tail];
call->socket = rx;
rcu_assign_pointer(call->socket, rx);
if (rx->discard_new_call) {
_debug("discard %lx", call->user_call_ID);
rx->discard_new_call(call, call->user_call_ID);
@ -295,8 +298,7 @@ static struct rxrpc_call *rxrpc_alloc_incoming_call(struct rxrpc_sock *rx,
b->conn_backlog[conn_tail] = NULL;
smp_store_release(&b->conn_backlog_tail,
(conn_tail + 1) & (RXRPC_BACKLOG_MAX - 1));
rxrpc_get_local(local);
conn->params.local = local;
conn->params.local = rxrpc_get_local(local);
conn->params.peer = peer;
rxrpc_see_connection(conn);
rxrpc_new_incoming_connection(rx, conn, skb);
@ -456,6 +458,7 @@ struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *rx,
unsigned long user_call_ID,
rxrpc_notify_rx_t notify_rx)
__releases(&rx->sk.sk_lock.slock)
__acquires(call->user_mutex)
{
struct rxrpc_call *call;
struct rb_node *parent, **pp;

4
net/rxrpc/call_event.c
View File

@ -226,7 +226,7 @@ static void rxrpc_resend(struct rxrpc_call *call, unsigned long now_j)
ktime_to_ns(ktime_sub(skb->tstamp, max_age)));
}
resend_at = nsecs_to_jiffies(ktime_to_ns(ktime_sub(oldest, now)));
resend_at = nsecs_to_jiffies(ktime_to_ns(ktime_sub(now, oldest)));
resend_at += jiffies + rxrpc_resend_timeout;
WRITE_ONCE(call->resend_at, resend_at);
@ -238,7 +238,7 @@ static void rxrpc_resend(struct rxrpc_call *call, unsigned long now_j)
* retransmitting data.
*/
if (!retrans) {
rxrpc_reduce_call_timer(call, resend_at, now,
rxrpc_reduce_call_timer(call, resend_at, now_j,
rxrpc_timer_set_for_resend);
spin_unlock_bh(&call->lock);
ack_ts = ktime_sub(now, call->acks_latest_ts);

17
net/rxrpc/call_object.c
View File

@ -103,6 +103,7 @@ struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp,
unsigned int debug_id)
{
struct rxrpc_call *call;
struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
if (!call)
@ -153,6 +154,9 @@ struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp,
call->cong_cwnd = 2;
call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1;
call->rxnet = rxnet;
atomic_inc(&rxnet->nr_calls);
return call;
nomem_2:
@ -219,9 +223,10 @@ struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
gfp_t gfp,
unsigned int debug_id)
__releases(&rx->sk.sk_lock.slock)
__acquires(&call->user_mutex)
{
struct rxrpc_call *call, *xcall;
struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
struct rxrpc_net *rxnet;
struct rb_node *parent, **pp;
const void *here = __builtin_return_address(0);
int ret;
@ -271,6 +276,7 @@ struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
write_unlock(&rx->call_lock);
rxnet = call->rxnet;
write_lock(&rxnet->call_lock);
list_add_tail(&call->link, &rxnet->calls);
write_unlock(&rxnet->call_lock);
@ -616,7 +622,7 @@ void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
*/
void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
{
struct rxrpc_net *rxnet;
struct rxrpc_net *rxnet = call->rxnet;
const void *here = __builtin_return_address(0);
int n;
@ -630,7 +636,6 @@ void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
if (!list_empty(&call->link)) {
rxnet = rxrpc_net(sock_net(&call->socket->sk));
write_lock(&rxnet->call_lock);
list_del_init(&call->link);
write_unlock(&rxnet->call_lock);
@ -646,11 +651,14 @@ void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
static void rxrpc_rcu_destroy_call(struct rcu_head *rcu)
{
struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
struct rxrpc_net *rxnet = call->rxnet;
rxrpc_put_peer(call->peer);
kfree(call->rxtx_buffer);
kfree(call->rxtx_annotations);
kmem_cache_free(rxrpc_call_jar, call);
if (atomic_dec_and_test(&rxnet->nr_calls))
wake_up_atomic_t(&rxnet->nr_calls);
}
/*
@ -715,4 +723,7 @@ void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet)
}
write_unlock(&rxnet->call_lock);
atomic_dec(&rxnet->nr_calls);
wait_on_atomic_t(&rxnet->nr_calls, atomic_t_wait, TASK_UNINTERRUPTIBLE);
}

3
net/rxrpc/conn_client.c
View File

@ -207,6 +207,7 @@ rxrpc_alloc_client_connection(struct rxrpc_conn_parameters *cp, gfp_t gfp)
if (ret < 0)
goto error_2;
atomic_inc(&rxnet->nr_conns);
write_lock(&rxnet->conn_lock);
list_add_tail(&conn->proc_link, &rxnet->conn_proc_list);
write_unlock(&rxnet->conn_lock);
@ -776,7 +777,7 @@ void rxrpc_disconnect_client_call(struct rxrpc_call *call)
unsigned int channel = call->cid & RXRPC_CHANNELMASK;
struct rxrpc_connection *conn = call->conn;
struct rxrpc_channel *chan = &conn->channels[channel];
struct rxrpc_net *rxnet = rxrpc_net(sock_net(&call->socket->sk));
struct rxrpc_net *rxnet = conn->params.local->rxnet;
trace_rxrpc_client(conn, channel, rxrpc_client_chan_disconnect);
call->conn = NULL;

3
net/rxrpc/conn_event.c
View File

@ -136,6 +136,7 @@ static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
}
kernel_sendmsg(conn->params.local->socket, &msg, iov, ioc, len);
conn->params.peer->last_tx_at = ktime_get_real();
_leave("");
return;
}
@ -239,6 +240,8 @@ static int rxrpc_abort_connection(struct rxrpc_connection *conn,
return -EAGAIN;
}
conn->params.peer->last_tx_at = ktime_get_real();
_leave(" = 0");
return 0;
}

10
net/rxrpc/conn_object.c
View File

@ -365,6 +365,9 @@ static void rxrpc_destroy_connection(struct rcu_head *rcu)
key_put(conn->params.key);
key_put(conn->server_key);
rxrpc_put_peer(conn->params.peer);
if (atomic_dec_and_test(&conn->params.local->rxnet->nr_conns))
wake_up_atomic_t(&conn->params.local->rxnet->nr_conns);
rxrpc_put_local(conn->params.local);
kfree(conn);
@ -418,7 +421,7 @@ void rxrpc_service_connection_reaper(struct work_struct *work)
*/
if (atomic_cmpxchg(&conn->usage, 1, 0) != 1)
continue;
trace_rxrpc_conn(conn, rxrpc_conn_reap_service, 0, 0);
trace_rxrpc_conn(conn, rxrpc_conn_reap_service, 0, NULL);
if (rxrpc_conn_is_client(conn))
BUG();
@ -458,6 +461,7 @@ void rxrpc_destroy_all_connections(struct rxrpc_net *rxnet)
_enter("");
atomic_dec(&rxnet->nr_conns);
rxrpc_destroy_all_client_connections(rxnet);
del_timer_sync(&rxnet->service_conn_reap_timer);
@ -475,5 +479,9 @@ void rxrpc_destroy_all_connections(struct rxrpc_net *rxnet)
ASSERT(list_empty(&rxnet->conn_proc_list));
/* We need to wait for the connections to be destroyed by RCU as they
* pin things that we still need to get rid of.
*/
wait_on_atomic_t(&rxnet->nr_conns, atomic_t_wait, TASK_UNINTERRUPTIBLE);
_leave("");
}

1
net/rxrpc/conn_service.c
View File

@ -132,6 +132,7 @@ struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *rxn
conn->state = RXRPC_CONN_SERVICE_PREALLOC;
atomic_set(&conn->usage, 2);
atomic_inc(&rxnet->nr_conns);
write_lock(&rxnet->conn_lock);
list_add_tail(&conn->link, &rxnet->service_conns);
list_add_tail(&conn->proc_link, &rxnet->conn_proc_list);

21
net/rxrpc/input.c
View File

@ -1183,6 +1183,8 @@ void rxrpc_data_ready(struct sock *udp_sk)
switch (sp->hdr.type) {
case RXRPC_PACKET_TYPE_VERSION:
if (!(sp->hdr.flags & RXRPC_CLIENT_INITIATED))
goto discard;
rxrpc_post_packet_to_local(local, skb);
goto out;
@ -1240,16 +1242,19 @@ void rxrpc_data_ready(struct sock *udp_sk)
goto discard_unlock;
if (sp->hdr.callNumber == chan->last_call) {
/* For the previous service call, if completed successfully, we
* discard all further packets.
*/
if (rxrpc_conn_is_service(conn) &&
(chan->last_type == RXRPC_PACKET_TYPE_ACK ||
sp->hdr.type == RXRPC_PACKET_TYPE_ABORT))
if (chan->call ||
sp->hdr.type == RXRPC_PACKET_TYPE_ABORT)
goto discard_unlock;
/* But otherwise we need to retransmit the final packet from
* data cached in the connection record.
/* For the previous service call, if completed
* successfully, we discard all further packets.
*/
if (rxrpc_conn_is_service(conn) &&
chan->last_type == RXRPC_PACKET_TYPE_ACK)
goto discard_unlock;
/* But otherwise we need to retransmit the final packet
* from data cached in the connection record.
*/
rxrpc_post_packet_to_conn(conn, skb);
goto out_unlock;

65
net/rxrpc/local_object.c
View File

@ -95,6 +95,7 @@ static struct rxrpc_local *rxrpc_alloc_local(struct rxrpc_net *rxnet,
local->debug_id = atomic_inc_return(&rxrpc_debug_id);
memcpy(&local->srx, srx, sizeof(*srx));
local->srx.srx_service = 0;
trace_rxrpc_local(local, rxrpc_local_new, 1, NULL);
}
_leave(" = %p", local);
@ -256,15 +257,74 @@ struct rxrpc_local *rxrpc_lookup_local(struct net *net,
return ERR_PTR(-EADDRINUSE);
}
/*
* Get a ref on a local endpoint.
*/
struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *local)
{
const void *here = __builtin_return_address(0);
int n;
n = atomic_inc_return(&local->usage);
trace_rxrpc_local(local, rxrpc_local_got, n, here);
return local;
}
/*
* Get a ref on a local endpoint unless its usage has already reached 0.
*/
struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *local)
{
const void *here = __builtin_return_address(0);
if (local) {
int n = __atomic_add_unless(&local->usage, 1, 0);
if (n > 0)
trace_rxrpc_local(local, rxrpc_local_got, n + 1, here);
else
local = NULL;
}
return local;
}
/*
* Queue a local endpoint.
*/
void rxrpc_queue_local(struct rxrpc_local *local)
{
const void *here = __builtin_return_address(0);
if (rxrpc_queue_work(&local->processor))
trace_rxrpc_local(local, rxrpc_local_queued,
atomic_read(&local->usage), here);
}
/*
* A local endpoint reached its end of life.
*/
void __rxrpc_put_local(struct rxrpc_local *local)
static void __rxrpc_put_local(struct rxrpc_local *local)
{
_enter("%d", local->debug_id);
rxrpc_queue_work(&local->processor);
}
/*
* Drop a ref on a local endpoint.
*/
void rxrpc_put_local(struct rxrpc_local *local)
{
const void *here = __builtin_return_address(0);
int n;
if (local) {
n = atomic_dec_return(&local->usage);
trace_rxrpc_local(local, rxrpc_local_put, n, here);
if (n == 0)
__rxrpc_put_local(local);
}
}
/*
* Destroy a local endpoint's socket and then hand the record to RCU to dispose
* of.
@ -322,7 +382,8 @@ static void rxrpc_local_processor(struct work_struct *work)
container_of(work, struct rxrpc_local, processor);
bool again;
_enter("%d", local->debug_id);
trace_rxrpc_local(local, rxrpc_local_processing,
atomic_read(&local->usage), NULL);
do {
again = false;

24
net/rxrpc/net_ns.c
View File

@ -32,13 +32,22 @@ static void rxrpc_service_conn_reap_timeout(struct timer_list *timer)
rxrpc_queue_work(&rxnet->service_conn_reaper);
}
static void rxrpc_peer_keepalive_timeout(struct timer_list *timer)
{
struct rxrpc_net *rxnet =
container_of(timer, struct rxrpc_net, peer_keepalive_timer);
if (rxnet->live)
rxrpc_queue_work(&rxnet->peer_keepalive_work);
}
/*
* Initialise a per-network namespace record.
*/
static __net_init int rxrpc_init_net(struct net *net)
{
struct rxrpc_net *rxnet = rxrpc_net(net);
int ret;
int ret, i;
rxnet->live = true;
get_random_bytes(&rxnet->epoch, sizeof(rxnet->epoch));
@ -46,7 +55,9 @@ static __net_init int rxrpc_init_net(struct net *net)
INIT_LIST_HEAD(&rxnet->calls);
rwlock_init(&rxnet->call_lock);
atomic_set(&rxnet->nr_calls, 1);
atomic_set(&rxnet->nr_conns, 1);
INIT_LIST_HEAD(&rxnet->conn_proc_list);
INIT_LIST_HEAD(&rxnet->service_conns);
rwlock_init(&rxnet->conn_lock);
@ -70,8 +81,16 @@ static __net_init int rxrpc_init_net(struct net *net)
INIT_LIST_HEAD(&rxnet->local_endpoints);
mutex_init(&rxnet->local_mutex);
hash_init(rxnet->peer_hash);
spin_lock_init(&rxnet->peer_hash_lock);
for (i = 0; i < ARRAY_SIZE(rxnet->peer_keepalive); i++)
INIT_HLIST_HEAD(&rxnet->peer_keepalive[i]);
INIT_HLIST_HEAD(&rxnet->peer_keepalive_new);
timer_setup(&rxnet->peer_keepalive_timer,
rxrpc_peer_keepalive_timeout, 0);
INIT_WORK(&rxnet->peer_keepalive_work, rxrpc_peer_keepalive_worker);
rxnet->peer_keepalive_base = ktime_add(ktime_get_real(), NSEC_PER_SEC);
ret = -ENOMEM;
rxnet->proc_net = proc_net_mkdir(net, "rxrpc", net->proc_net);
@ -95,8 +114,11 @@ static __net_exit void rxrpc_exit_net(struct net *net)
struct rxrpc_net *rxnet = rxrpc_net(net);
rxnet->live = false;
del_timer_sync(&rxnet->peer_keepalive_timer);
cancel_work_sync(&rxnet->peer_keepalive_work);
rxrpc_destroy_all_calls(rxnet);
rxrpc_destroy_all_connections(rxnet);
rxrpc_destroy_all_peers(rxnet);
rxrpc_destroy_all_locals(rxnet);
proc_remove(rxnet->proc_net);
}

59
net/rxrpc/output.c
View File

@ -32,6 +32,8 @@ struct rxrpc_abort_buffer {
__be32 abort_code;
};
static const char rxrpc_keepalive_string[] = "";
/*
* Arrange for a keepalive ping a certain time after we last transmitted. This
* lets the far side know we're still interested in this call and helps keep
@ -122,6 +124,7 @@ int rxrpc_send_ack_packet(struct rxrpc_call *call, bool ping,
struct kvec iov[2];
rxrpc_serial_t serial;
rxrpc_seq_t hard_ack, top;
ktime_t now;
size_t len, n;
int ret;
u8 reason;
@ -203,8 +206,10 @@ int rxrpc_send_ack_packet(struct rxrpc_call *call, bool ping,
}
ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
now = ktime_get_real();
if (ping)
call->ping_time = ktime_get_real();
call->ping_time = now;
conn->params.peer->last_tx_at = ktime_get_real();
if (call->state < RXRPC_CALL_COMPLETE) {
if (ret < 0) {
@ -288,6 +293,7 @@ int rxrpc_send_abort_packet(struct rxrpc_call *call)
ret = kernel_sendmsg(conn->params.local->socket,
&msg, iov, 1, sizeof(pkt));
conn->params.peer->last_tx_at = ktime_get_real();
rxrpc_put_connection(conn);
return ret;
@ -378,6 +384,7 @@ int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb,
* message and update the peer record
*/
ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
conn->params.peer->last_tx_at = ktime_get_real();
up_read(&conn->params.local->defrag_sem);
if (ret == -EMSGSIZE)
@ -429,6 +436,7 @@ int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb,
if (ret == 0) {
ret = kernel_sendmsg(conn->params.local->socket, &msg,
iov, 2, len);
conn->params.peer->last_tx_at = ktime_get_real();
opt = IP_PMTUDISC_DO;
kernel_setsockopt(conn->params.local->socket, SOL_IP,
@ -446,6 +454,7 @@ int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb,
if (ret == 0) {
ret = kernel_sendmsg(conn->params.local->socket, &msg,
iov, 2, len);
conn->params.peer->last_tx_at = ktime_get_real();
opt = IPV6_PMTUDISC_DO;
kernel_setsockopt(conn->params.local->socket,
@ -515,3 +524,51 @@ void rxrpc_reject_packets(struct rxrpc_local *local)
_leave("");
}
/*
* Send a VERSION reply to a peer as a keepalive.
*/
void rxrpc_send_keepalive(struct rxrpc_peer *peer)
{
struct rxrpc_wire_header whdr;
struct msghdr msg;
struct kvec iov[2];
size_t len;
int ret;
_enter("");
msg.msg_name = &peer->srx.transport;
msg.msg_namelen = peer->srx.transport_len;
msg.msg_control = NULL;
msg.msg_controllen = 0;
msg.msg_flags = 0;
whdr.epoch = htonl(peer->local->rxnet->epoch);
whdr.cid = 0;
whdr.callNumber = 0;
whdr.seq = 0;
whdr.serial = 0;
whdr.type = RXRPC_PACKET_TYPE_VERSION; /* Not client-initiated */
whdr.flags = RXRPC_LAST_PACKET;
whdr.userStatus = 0;
whdr.securityIndex = 0;
whdr._rsvd = 0;
whdr.serviceId = 0;
iov[0].iov_base = &whdr;
iov[0].iov_len = sizeof(whdr);
iov[1].iov_base = (char *)rxrpc_keepalive_string;
iov[1].iov_len = sizeof(rxrpc_keepalive_string);
len = iov[0].iov_len + iov[1].iov_len;
_proto("Tx VERSION (keepalive)");
ret = kernel_sendmsg(peer->local->socket, &msg, iov, 2, len);
if (ret < 0)
_debug("sendmsg failed: %d", ret);
peer->last_tx_at = ktime_get_real();
_leave("");
}

98
net/rxrpc/peer_event.c
View File

@ -192,7 +192,7 @@ void rxrpc_error_report(struct sock *sk)
rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
/* The ref we obtained is passed off to the work item */
rxrpc_queue_work(&peer->error_distributor);
__rxrpc_queue_peer_error(peer);
_leave("");
}
@ -348,3 +348,99 @@ void rxrpc_peer_add_rtt(struct rxrpc_call *call, enum rxrpc_rtt_rx_trace why,
trace_rxrpc_rtt_rx(call, why, send_serial, resp_serial, rtt,
usage, avg);
}
/*
* Perform keep-alive pings with VERSION packets to keep any NAT alive.
*/
void rxrpc_peer_keepalive_worker(struct work_struct *work)
{
struct rxrpc_net *rxnet =
container_of(work, struct rxrpc_net, peer_keepalive_work);
struct rxrpc_peer *peer;
unsigned long delay;
ktime_t base, now = ktime_get_real();
s64 diff;
u8 cursor, slot;
base = rxnet->peer_keepalive_base;
cursor = rxnet->peer_keepalive_cursor;
_enter("%u,%lld", cursor, ktime_sub(now, base));
next_bucket:
diff = ktime_to_ns(ktime_sub(now, base));
if (diff < 0)
goto resched;
_debug("at %u", cursor);
spin_lock_bh(&rxnet->peer_hash_lock);
next_peer:
if (!rxnet->live) {
spin_unlock_bh(&rxnet->peer_hash_lock);
goto out;
}
/* Everything in the bucket at the cursor is processed this second; the
* bucket at cursor + 1 goes now + 1s and so on...
*/
if (hlist_empty(&rxnet->peer_keepalive[cursor])) {
if (hlist_empty(&rxnet->peer_keepalive_new)) {
spin_unlock_bh(&rxnet->peer_hash_lock);
goto emptied_bucket;
}
hlist_move_list(&rxnet->peer_keepalive_new,
&rxnet->peer_keepalive[cursor]);
}
peer = hlist_entry(rxnet->peer_keepalive[cursor].first,
struct rxrpc_peer, keepalive_link);
hlist_del_init(&peer->keepalive_link);
if (!rxrpc_get_peer_maybe(peer))
goto next_peer;
spin_unlock_bh(&rxnet->peer_hash_lock);
_debug("peer %u {%pISp}", peer->debug_id, &peer->srx.transport);
recalc:
diff = ktime_divns(ktime_sub(peer->last_tx_at, base), NSEC_PER_SEC);
if (diff < -30 || diff > 30)
goto send; /* LSW of 64-bit time probably wrapped on 32-bit */
diff += RXRPC_KEEPALIVE_TIME - 1;
if (diff < 0)
goto send;
slot = (diff > RXRPC_KEEPALIVE_TIME - 1) ? RXRPC_KEEPALIVE_TIME - 1 : diff;
if (slot == 0)
goto send;
/* A transmission to this peer occurred since last we examined it so
* put it into the appropriate future bucket.
*/
slot = (slot + cursor) % ARRAY_SIZE(rxnet->peer_keepalive);
spin_lock_bh(&rxnet->peer_hash_lock);
hlist_add_head(&peer->keepalive_link, &rxnet->peer_keepalive[slot]);
rxrpc_put_peer(peer);
goto next_peer;
send:
rxrpc_send_keepalive(peer);
now = ktime_get_real();
goto recalc;
emptied_bucket:
cursor++;
if (cursor >= ARRAY_SIZE(rxnet->peer_keepalive))
cursor = 0;
base = ktime_add_ns(base, NSEC_PER_SEC);
goto next_bucket;
resched:
rxnet->peer_keepalive_base = base;
rxnet->peer_keepalive_cursor = cursor;
delay = nsecs_to_jiffies(-diff) + 1;
timer_reduce(&rxnet->peer_keepalive_timer, jiffies + delay);
out:
_leave("");
}

93
net/rxrpc/peer_object.c
View File

@ -322,6 +322,7 @@ struct rxrpc_peer *rxrpc_lookup_incoming_peer(struct rxrpc_local *local,
if (!peer) {
peer = prealloc;
hash_add_rcu(rxnet->peer_hash, &peer->hash_link, hash_key);
hlist_add_head(&peer->keepalive_link, &rxnet->peer_keepalive_new);
}
spin_unlock(&rxnet->peer_hash_lock);
@ -363,9 +364,12 @@ struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *local,
peer = __rxrpc_lookup_peer_rcu(local, srx, hash_key);
if (peer && !rxrpc_get_peer_maybe(peer))
peer = NULL;
if (!peer)
if (!peer) {
hash_add_rcu(rxnet->peer_hash,
&candidate->hash_link, hash_key);
hlist_add_head(&candidate->keepalive_link,
&rxnet->peer_keepalive_new);
}
spin_unlock_bh(&rxnet->peer_hash_lock);
@ -382,9 +386,54 @@ struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *local,
}
/*
* Discard a ref on a remote peer record.
* Get a ref on a peer record.
*/
void __rxrpc_put_peer(struct rxrpc_peer *peer)
struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *peer)
{
const void *here = __builtin_return_address(0);
int n;
n = atomic_inc_return(&peer->usage);
trace_rxrpc_peer(peer, rxrpc_peer_got, n, here);
return peer;
}
/*
* Get a ref on a peer record unless its usage has already reached 0.
*/
struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *peer)
{
const void *here = __builtin_return_address(0);
if (peer) {
int n = __atomic_add_unless(&peer->usage, 1, 0);
if (n > 0)
trace_rxrpc_peer(peer, rxrpc_peer_got, n + 1, here);
else
peer = NULL;
}
return peer;
}
/*
* Queue a peer record. This passes the caller's ref to the workqueue.
*/
void __rxrpc_queue_peer_error(struct rxrpc_peer *peer)
{
const void *here = __builtin_return_address(0);
int n;
n = atomic_read(&peer->usage);
if (rxrpc_queue_work(&peer->error_distributor))
trace_rxrpc_peer(peer, rxrpc_peer_queued_error, n, here);
else
rxrpc_put_peer(peer);
}
/*
* Discard a peer record.
*/
static void __rxrpc_put_peer(struct rxrpc_peer *peer)
{
struct rxrpc_net *rxnet = peer->local->rxnet;
@ -392,11 +441,49 @@ void __rxrpc_put_peer(struct rxrpc_peer *peer)
spin_lock_bh(&rxnet->peer_hash_lock);
hash_del_rcu(&peer->hash_link);
hlist_del_init(&peer->keepalive_link);
spin_unlock_bh(&rxnet->peer_hash_lock);
kfree_rcu(peer, rcu);
}
/*
* Drop a ref on a peer record.
*/
void rxrpc_put_peer(struct rxrpc_peer *peer)
{
const void *here = __builtin_return_address(0);
int n;
if (peer) {
n = atomic_dec_return(&peer->usage);
trace_rxrpc_peer(peer, rxrpc_peer_put, n, here);
if (n == 0)
__rxrpc_put_peer(peer);
}
}
/*
* Make sure all peer records have been discarded.
*/
void rxrpc_destroy_all_peers(struct rxrpc_net *rxnet)
{
struct rxrpc_peer *peer;
int i;
for (i = 0; i < HASH_SIZE(rxnet->peer_hash); i++) {
if (hlist_empty(&rxnet->peer_hash[i]))
continue;
hlist_for_each_entry(peer, &rxnet->peer_hash[i], hash_link) {
pr_err("Leaked peer %u {%u} %pISp\n",
peer->debug_id,
atomic_read(&peer->usage),
&peer->srx.transport);
}
}
}
/**
* rxrpc_kernel_get_peer - Get the peer address of a call
* @sock: The socket on which the call is in progress.

6
net/rxrpc/proc.c
View File

@ -29,6 +29,8 @@ static const char *const rxrpc_conn_states[RXRPC_CONN__NR_STATES] = {
* generate a list of extant and dead calls in /proc/net/rxrpc_calls
*/
static void *rxrpc_call_seq_start(struct seq_file *seq, loff_t *_pos)
__acquires(rcu)
__acquires(rxnet->call_lock)
{
struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
@ -45,6 +47,8 @@ static void *rxrpc_call_seq_next(struct seq_file *seq, void *v, loff_t *pos)
}
static void rxrpc_call_seq_stop(struct seq_file *seq, void *v)
__releases(rxnet->call_lock)
__releases(rcu)
{
struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
@ -135,6 +139,7 @@ const struct file_operations rxrpc_call_seq_fops = {
* generate a list of extant virtual connections in /proc/net/rxrpc_conns
*/
static void *rxrpc_connection_seq_start(struct seq_file *seq, loff_t *_pos)
__acquires(rxnet->conn_lock)
{
struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
@ -151,6 +156,7 @@ static void *rxrpc_connection_seq_next(struct seq_file *seq, void *v,
}
static void rxrpc_connection_seq_stop(struct seq_file *seq, void *v)
__releases(rxnet->conn_lock)
{
struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));

2
net/rxrpc/rxkad.c
View File

@ -668,6 +668,7 @@ static int rxkad_issue_challenge(struct rxrpc_connection *conn)
return -EAGAIN;
}
conn->params.peer->last_tx_at = ktime_get_real();
_leave(" = 0");
return 0;
}
@ -722,6 +723,7 @@ static int rxkad_send_response(struct rxrpc_connection *conn,
return -EAGAIN;
}
conn->params.peer->last_tx_at = ktime_get_real();
_leave(" = 0");
return 0;
}

3
net/rxrpc/security.c
View File

@ -19,9 +19,6 @@
#include <keys/rxrpc-type.h>
#include "ar-internal.h"
static LIST_HEAD(rxrpc_security_methods);
static DECLARE_RWSEM(rxrpc_security_sem);
static const struct rxrpc_security *rxrpc_security_types[] = {
[RXRPC_SECURITY_NONE] = &rxrpc_no_security,
#ifdef CONFIG_RXKAD

7
net/rxrpc/sendmsg.c
View File

@ -130,7 +130,9 @@ static inline void rxrpc_instant_resend(struct rxrpc_call *call, int ix)
spin_lock_bh(&call->lock);
if (call->state < RXRPC_CALL_COMPLETE) {
call->rxtx_annotations[ix] = RXRPC_TX_ANNO_RETRANS;
call->rxtx_annotations[ix] =
(call->rxtx_annotations[ix] & RXRPC_TX_ANNO_LAST) |
RXRPC_TX_ANNO_RETRANS;
if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events))
rxrpc_queue_call(call);
}
@ -554,6 +556,7 @@ static struct rxrpc_call *
rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
struct rxrpc_send_params *p)
__releases(&rx->sk.sk_lock.slock)
__acquires(&call->user_mutex)
{
struct rxrpc_conn_parameters cp;
struct rxrpc_call *call;
@ -583,6 +586,7 @@ rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
atomic_inc_return(&rxrpc_debug_id));
/* The socket is now unlocked */
rxrpc_put_peer(cp.peer);
_leave(" = %p\n", call);
return call;
}
@ -594,6 +598,7 @@ rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
*/
int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
__releases(&rx->sk.sk_lock.slock)
__releases(&call->user_mutex)
{
enum rxrpc_call_state state;
struct rxrpc_call *call;