recvmsg.o \
security.o \
skbuff.o \
- transport.o \
utils.o
af-rxrpc-$(CONFIG_PROC_FS) += proc.o
return ret;
}
-/*
- * find a transport by address
- */
-struct rxrpc_transport *
-rxrpc_name_to_transport(struct rxrpc_conn_parameters *cp,
- struct sockaddr *addr,
- int addr_len,
- gfp_t gfp)
-{
- struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
- struct rxrpc_transport *trans;
-
- _enter("%p,%d", addr, addr_len);
-
- if (cp->local->srx.transport_type != srx->transport_type)
- return ERR_PTR(-ESOCKTNOSUPPORT);
- if (cp->local->srx.transport.family != srx->transport.family)
- return ERR_PTR(-EAFNOSUPPORT);
-
- /* find a remote transport endpoint from the local one */
- cp->peer = rxrpc_lookup_peer(cp->local, srx, gfp);
- if (!cp->peer)
- return ERR_PTR(-ENOMEM);
-
- /* find a transport */
- trans = rxrpc_get_transport(cp->local, cp->peer, gfp);
- rxrpc_put_peer(cp->peer);
- _leave(" = %p", trans);
- return trans;
-}
-
/**
* rxrpc_kernel_begin_call - Allow a kernel service to begin a call
* @sock: The socket on which to make the call
gfp_t gfp)
{
struct rxrpc_conn_parameters cp;
- struct rxrpc_transport *trans;
struct rxrpc_call *call;
struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
int ret;
cp.security_level = 0;
cp.exclusive = false;
cp.service_id = srx->srx_service;
+ call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, gfp);
- trans = rxrpc_name_to_transport(&cp, (struct sockaddr *)srx,
- sizeof(*srx), gfp);
- if (IS_ERR(trans)) {
- call = ERR_CAST(trans);
- trans = NULL;
- goto out_notrans;
- }
- cp.peer = trans->peer;
-
- call = rxrpc_new_client_call(rx, &cp, trans, srx, user_call_ID, gfp);
- rxrpc_put_transport(trans);
-out_notrans:
release_sock(&rx->sk);
_leave(" = %p", call);
return call;
proto_unregister(&rxrpc_proto);
rxrpc_destroy_all_calls();
rxrpc_destroy_all_connections();
- rxrpc_destroy_all_transports();
ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);
struct rxrpc_local *local;
struct hlist_head error_targets; /* targets for net error distribution */
struct work_struct error_distributor;
+ struct rb_root service_conns; /* Service connections */
+ rwlock_t conn_lock;
spinlock_t lock; /* access lock */
unsigned int if_mtu; /* interface MTU for this peer */
unsigned int mtu; /* network MTU for this peer */
suseconds_t rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* calculated RTT cache */
};
-/*
- * RxRPC point-to-point transport / connection manager definition
- * - handles a bundle of connections between two endpoints
- * - matched by { local, peer }
- */
-struct rxrpc_transport {
- struct rxrpc_local *local; /* local transport endpoint */
- struct rxrpc_peer *peer; /* remote transport endpoint */
- struct rb_root server_conns; /* server connections on this transport */
- struct list_head link; /* link in master session list */
- unsigned long put_time; /* time at which to reap */
- rwlock_t conn_lock; /* lock for active/dead connections */
- atomic_t usage;
- int debug_id; /* debug ID for printks */
-};
-
/*
* Keys for matching a connection.
*/
/*
* RxRPC connection definition
- * - matched by { transport, service_id, conn_id, direction, key }
+ * - matched by { local, peer, epoch, conn_id, direction }
* - each connection can only handle four simultaneous calls
*/
struct rxrpc_connection {
- struct rxrpc_transport *trans; /* transport session */
struct rxrpc_conn_proto proto;
struct rxrpc_conn_parameters params;
struct work_struct processor; /* connection event processor */
union {
struct rb_node client_node; /* Node in local->client_conns */
- struct rb_node service_node; /* Node in trans->server_conns */
+ struct rb_node service_node; /* Node in peer->service_conns */
};
struct list_head link; /* link in master connection list */
struct rb_root calls; /* calls on this connection */
extern atomic_t rxrpc_debug_id;
extern struct workqueue_struct *rxrpc_workqueue;
-extern struct rxrpc_transport *rxrpc_name_to_transport(struct rxrpc_conn_parameters *,
- struct sockaddr *,
- int, gfp_t);
-
/*
* call_accept.c
*/
struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
struct rxrpc_conn_parameters *,
- struct rxrpc_transport *,
struct sockaddr_rxrpc *,
unsigned long, gfp_t);
struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *,
extern rwlock_t rxrpc_connection_lock;
int rxrpc_connect_call(struct rxrpc_call *, struct rxrpc_conn_parameters *,
- struct rxrpc_transport *,
struct sockaddr_rxrpc *, gfp_t);
+struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_local *,
+ struct rxrpc_peer *,
+ struct sk_buff *);
void rxrpc_disconnect_call(struct rxrpc_call *);
void rxrpc_put_connection(struct rxrpc_connection *);
void __exit rxrpc_destroy_all_connections(void);
-struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *,
- struct sk_buff *);
-extern struct rxrpc_connection *
-rxrpc_incoming_connection(struct rxrpc_transport *, struct sk_buff *);
+struct rxrpc_connection *rxrpc_incoming_connection(struct rxrpc_local *,
+ struct rxrpc_peer *,
+ struct sk_buff *);
static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
{
atomic_inc(&conn->usage);
}
-static inline
-struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *conn)
-{
- return atomic_inc_not_zero(&conn->usage) ? conn : NULL;
-}
-
/*
* input.c
*/
static inline void rxrpc_sysctl_exit(void) {}
#endif
-/*
- * transport.c
- */
-extern unsigned int rxrpc_transport_expiry;
-
-struct rxrpc_transport *rxrpc_get_transport(struct rxrpc_local *,
- struct rxrpc_peer *, gfp_t);
-void rxrpc_put_transport(struct rxrpc_transport *);
-void __exit rxrpc_destroy_all_transports(void);
-struct rxrpc_transport *rxrpc_find_transport(struct rxrpc_local *,
- struct rxrpc_peer *);
-
/*
* utils.c
*/
struct sockaddr_rxrpc *srx)
{
struct rxrpc_connection *conn;
- struct rxrpc_transport *trans;
struct rxrpc_skb_priv *sp, *nsp;
struct rxrpc_peer *peer;
struct rxrpc_call *call;
goto error;
}
- trans = rxrpc_get_transport(local, peer, GFP_NOIO);
+ conn = rxrpc_incoming_connection(local, peer, skb);
rxrpc_put_peer(peer);
- if (IS_ERR(trans)) {
- _debug("no trans");
- ret = -EBUSY;
- goto error;
- }
-
- conn = rxrpc_incoming_connection(trans, skb);
- rxrpc_put_transport(trans);
if (IS_ERR(conn)) {
_debug("no conn");
ret = PTR_ERR(conn);
/*
* Allocate a new client call.
*/
-static struct rxrpc_call *rxrpc_alloc_client_call(
- struct rxrpc_sock *rx,
- struct rxrpc_conn_parameters *cp,
- struct sockaddr_rxrpc *srx,
- gfp_t gfp)
+static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
+ struct sockaddr_rxrpc *srx,
+ gfp_t gfp)
{
struct rxrpc_call *call;
*/
static int rxrpc_begin_client_call(struct rxrpc_call *call,
struct rxrpc_conn_parameters *cp,
- struct rxrpc_transport *trans,
struct sockaddr_rxrpc *srx,
gfp_t gfp)
{
/* Set up or get a connection record and set the protocol parameters,
* including channel number and call ID.
*/
- ret = rxrpc_connect_call(call, cp, trans, srx, gfp);
+ ret = rxrpc_connect_call(call, cp, srx, gfp);
if (ret < 0)
return ret;
*/
struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
struct rxrpc_conn_parameters *cp,
- struct rxrpc_transport *trans,
struct sockaddr_rxrpc *srx,
unsigned long user_call_ID,
gfp_t gfp)
_enter("%p,%lx", rx, user_call_ID);
- call = rxrpc_alloc_client_call(rx, cp, srx, gfp);
+ call = rxrpc_alloc_client_call(rx, srx, gfp);
if (IS_ERR(call)) {
_leave(" = %ld", PTR_ERR(call));
return call;
list_add_tail(&call->link, &rxrpc_calls);
write_unlock_bh(&rxrpc_call_lock);
- ret = rxrpc_begin_client_call(call, cp, trans, srx, gfp);
+ ret = rxrpc_begin_client_call(call, cp, srx, gfp);
if (ret < 0)
goto error;
* padding bytes in *cp.
*/
static struct rxrpc_connection *
-rxrpc_alloc_client_connection(struct rxrpc_conn_parameters *cp,
- struct rxrpc_transport *trans,
- gfp_t gfp)
+rxrpc_alloc_client_connection(struct rxrpc_conn_parameters *cp, gfp_t gfp)
{
struct rxrpc_connection *conn;
int ret;
list_add_tail(&conn->link, &rxrpc_connections);
write_unlock(&rxrpc_connection_lock);
+ /* We steal the caller's peer ref. */
+ cp->peer = NULL;
+ rxrpc_get_local(conn->params.local);
key_get(conn->params.key);
- conn->trans = trans;
- atomic_inc(&trans->usage);
_leave(" = %p", conn);
return conn;
*/
int rxrpc_connect_call(struct rxrpc_call *call,
struct rxrpc_conn_parameters *cp,
- struct rxrpc_transport *trans,
struct sockaddr_rxrpc *srx,
gfp_t gfp)
{
_enter("{%d,%lx},", call->debug_id, call->user_call_ID);
- cp->peer = trans->peer;
- rxrpc_get_peer(cp->peer);
+ cp->peer = rxrpc_lookup_peer(cp->local, srx, gfp);
+ if (!cp->peer)
+ return -ENOMEM;
if (!cp->exclusive) {
/* Search for a existing client connection unless this is going
/* We didn't find a connection or we want an exclusive one. */
_debug("get new conn");
- candidate = rxrpc_alloc_client_connection(cp, trans, gfp);
+ candidate = rxrpc_alloc_client_connection(cp, gfp);
if (!candidate) {
_leave(" = -ENOMEM");
return -ENOMEM;
rxrpc_add_call_ID_to_conn(conn, call);
spin_unlock(&conn->channel_lock);
+ rxrpc_put_peer(cp->peer);
+ cp->peer = NULL;
_leave(" = %p {u=%d}", conn, atomic_read(&conn->usage));
return 0;
remove_wait_queue(&conn->channel_wq, &myself);
__set_current_state(TASK_RUNNING);
rxrpc_put_connection(conn);
+ rxrpc_put_peer(cp->peer);
+ cp->peer = NULL;
_leave(" = -ERESTARTSYS");
return -ERESTARTSYS;
}
/*
* get a record of an incoming connection
*/
-struct rxrpc_connection *rxrpc_incoming_connection(struct rxrpc_transport *trans,
+struct rxrpc_connection *rxrpc_incoming_connection(struct rxrpc_local *local,
+ struct rxrpc_peer *peer,
struct sk_buff *skb)
{
struct rxrpc_connection *conn, *candidate = NULL;
cid = sp->hdr.cid & RXRPC_CIDMASK;
/* search the connection list first */
- read_lock_bh(&trans->conn_lock);
+ read_lock_bh(&peer->conn_lock);
- p = trans->server_conns.rb_node;
+ p = peer->service_conns.rb_node;
while (p) {
conn = rb_entry(p, struct rxrpc_connection, service_node);
else
goto found_extant_connection;
}
- read_unlock_bh(&trans->conn_lock);
+ read_unlock_bh(&peer->conn_lock);
/* not yet present - create a candidate for a new record and then
* redo the search */
return ERR_PTR(-ENOMEM);
}
- candidate->trans = trans;
- candidate->proto.local = trans->local;
+ candidate->proto.local = local;
candidate->proto.epoch = sp->hdr.epoch;
candidate->proto.cid = sp->hdr.cid & RXRPC_CIDMASK;
candidate->proto.in_clientflag = RXRPC_CLIENT_INITIATED;
- candidate->params.local = trans->local;
- candidate->params.peer = trans->peer;
+ candidate->params.local = local;
+ candidate->params.peer = peer;
candidate->params.service_id = sp->hdr.serviceId;
candidate->security_ix = sp->hdr.securityIndex;
candidate->out_clientflag = 0;
if (candidate->params.service_id)
candidate->state = RXRPC_CONN_SERVER_UNSECURED;
- write_lock_bh(&trans->conn_lock);
+ write_lock_bh(&peer->conn_lock);
- pp = &trans->server_conns.rb_node;
+ pp = &peer->service_conns.rb_node;
p = NULL;
while (*pp) {
p = *pp;
conn = candidate;
candidate = NULL;
rb_link_node(&conn->service_node, p, pp);
- rb_insert_color(&conn->service_node, &trans->server_conns);
- atomic_inc(&conn->trans->usage);
+ rb_insert_color(&conn->service_node, &peer->service_conns);
+ rxrpc_get_peer(peer);
+ rxrpc_get_local(local);
- write_unlock_bh(&trans->conn_lock);
+ write_unlock_bh(&peer->conn_lock);
write_lock(&rxrpc_connection_lock);
list_add_tail(&conn->link, &rxrpc_connections);
/* we found the connection in the list immediately */
found_extant_connection:
if (sp->hdr.securityIndex != conn->security_ix) {
- read_unlock_bh(&trans->conn_lock);
+ read_unlock_bh(&peer->conn_lock);
goto security_mismatch;
}
rxrpc_get_connection(conn);
- read_unlock_bh(&trans->conn_lock);
+ read_unlock_bh(&peer->conn_lock);
goto success;
/* we found the connection on the second time through the list */
found_extant_second:
if (sp->hdr.securityIndex != conn->security_ix) {
- write_unlock_bh(&trans->conn_lock);
+ write_unlock_bh(&peer->conn_lock);
goto security_mismatch;
}
rxrpc_get_connection(conn);
- write_unlock_bh(&trans->conn_lock);
+ write_unlock_bh(&peer->conn_lock);
kfree(candidate);
goto success;
* find a connection based on transport and RxRPC connection ID for an incoming
* packet
*/
-struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *trans,
+struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_local *local,
+ struct rxrpc_peer *peer,
struct sk_buff *skb)
{
struct rxrpc_connection *conn;
_enter(",{%x,%x}", sp->hdr.cid, sp->hdr.flags);
- read_lock_bh(&trans->conn_lock);
+ read_lock_bh(&peer->conn_lock);
cid = sp->hdr.cid & RXRPC_CIDMASK;
epoch = sp->hdr.epoch;
if (sp->hdr.flags & RXRPC_CLIENT_INITIATED) {
- p = trans->server_conns.rb_node;
+ p = peer->service_conns.rb_node;
while (p) {
conn = rb_entry(p, struct rxrpc_connection, service_node);
goto found;
}
- read_unlock_bh(&trans->conn_lock);
+ read_unlock_bh(&peer->conn_lock);
_leave(" = NULL");
return NULL;
found:
rxrpc_get_connection(conn);
- read_unlock_bh(&trans->conn_lock);
+ read_unlock_bh(&peer->conn_lock);
_leave(" = %p", conn);
return conn;
}
conn->security->clear(conn);
key_put(conn->params.key);
key_put(conn->server_key);
+ rxrpc_put_peer(conn->params.peer);
+ rxrpc_put_local(conn->params.local);
- rxrpc_put_transport(conn->trans);
kfree(conn);
_leave("");
}
static void rxrpc_connection_reaper(struct work_struct *work)
{
struct rxrpc_connection *conn, *_p;
+ struct rxrpc_peer *peer;
unsigned long now, earliest, reap_time;
LIST_HEAD(graveyard);
spin_unlock(&local->client_conns_lock);
} else {
- write_lock_bh(&conn->trans->conn_lock);
+ peer = conn->params.peer;
+ write_lock_bh(&peer->conn_lock);
reap_time = conn->put_time + rxrpc_connection_expiry;
if (atomic_read(&conn->usage) > 0) {
} else if (reap_time <= now) {
list_move_tail(&conn->link, &graveyard);
rb_erase(&conn->service_node,
- &conn->trans->server_conns);
+ &peer->service_conns);
} else if (reap_time < earliest) {
earliest = reap_time;
}
- write_unlock_bh(&conn->trans->conn_lock);
+ write_unlock_bh(&peer->conn_lock);
}
}
write_unlock(&rxrpc_connection_lock);
struct sk_buff *skb)
{
struct rxrpc_peer *peer;
- struct rxrpc_transport *trans;
struct rxrpc_connection *conn;
struct sockaddr_rxrpc srx;
if (!peer)
goto cant_find_peer;
- trans = rxrpc_find_transport(local, peer);
+ conn = rxrpc_find_connection(local, peer, skb);
rcu_read_unlock();
- if (!trans)
- goto cant_find_conn;
-
- conn = rxrpc_find_connection(trans, skb);
- rxrpc_put_transport(trans);
if (!conn)
goto cant_find_conn;
unsigned long user_call_ID, bool exclusive)
{
struct rxrpc_conn_parameters cp;
- struct rxrpc_transport *trans;
struct rxrpc_call *call;
struct key *key;
- long ret;
DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name);
cp.security_level = rx->min_sec_level;
cp.exclusive = rx->exclusive | exclusive;
cp.service_id = srx->srx_service;
- trans = rxrpc_name_to_transport(&cp, msg->msg_name, msg->msg_namelen,
- GFP_KERNEL);
- if (IS_ERR(trans)) {
- ret = PTR_ERR(trans);
- goto out;
- }
- cp.peer = trans->peer;
-
- call = rxrpc_new_client_call(rx, &cp, trans, srx, user_call_ID,
- GFP_KERNEL);
- rxrpc_put_transport(trans);
- if (IS_ERR(call)) {
- ret = PTR_ERR(call);
- goto out_trans;
- }
+ call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, GFP_KERNEL);
_leave(" = %p\n", call);
return call;
-
-out_trans:
- rxrpc_put_transport(trans);
-out:
- _leave(" = %ld", ret);
- return ERR_PTR(ret);
}
/*
INIT_HLIST_HEAD(&peer->error_targets);
INIT_WORK(&peer->error_distributor,
&rxrpc_peer_error_distributor);
+ peer->service_conns = RB_ROOT;
+ rwlock_init(&peer->conn_lock);
spin_lock_init(&peer->lock);
peer->debug_id = atomic_inc_return(&rxrpc_debug_id);
}
.proc_handler = proc_dointvec_minmax,
.extra1 = (void *)&one,
},
- {
- .procname = "transport_expiry",
- .data = &rxrpc_transport_expiry,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = (void *)&one,
- },
/* Non-time values */
{
+++ /dev/null
-/* RxRPC point-to-point transport session management
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/net.h>
-#include <linux/skbuff.h>
-#include <linux/slab.h>
-#include <net/sock.h>
-#include <net/af_rxrpc.h>
-#include "ar-internal.h"
-
-/*
- * Time after last use at which transport record is cleaned up.
- */
-unsigned int rxrpc_transport_expiry = 3600 * 24;
-
-static void rxrpc_transport_reaper(struct work_struct *work);
-
-static LIST_HEAD(rxrpc_transports);
-static DEFINE_RWLOCK(rxrpc_transport_lock);
-static DECLARE_DELAYED_WORK(rxrpc_transport_reap, rxrpc_transport_reaper);
-
-/*
- * allocate a new transport session manager
- */
-static struct rxrpc_transport *rxrpc_alloc_transport(struct rxrpc_local *local,
- struct rxrpc_peer *peer,
- gfp_t gfp)
-{
- struct rxrpc_transport *trans;
-
- _enter("");
-
- trans = kzalloc(sizeof(struct rxrpc_transport), gfp);
- if (trans) {
- trans->local = local;
- trans->peer = peer;
- INIT_LIST_HEAD(&trans->link);
- trans->server_conns = RB_ROOT;
- rwlock_init(&trans->conn_lock);
- atomic_set(&trans->usage, 1);
- trans->debug_id = atomic_inc_return(&rxrpc_debug_id);
- }
-
- _leave(" = %p", trans);
- return trans;
-}
-
-/*
- * obtain a transport session for the nominated endpoints
- */
-struct rxrpc_transport *rxrpc_get_transport(struct rxrpc_local *local,
- struct rxrpc_peer *peer,
- gfp_t gfp)
-{
- struct rxrpc_transport *trans, *candidate;
- const char *new = "old";
- int usage;
-
- _enter("{%pI4+%hu},{%pI4+%hu},",
- &local->srx.transport.sin.sin_addr,
- ntohs(local->srx.transport.sin.sin_port),
- &peer->srx.transport.sin.sin_addr,
- ntohs(peer->srx.transport.sin.sin_port));
-
- /* search the transport list first */
- read_lock_bh(&rxrpc_transport_lock);
- list_for_each_entry(trans, &rxrpc_transports, link) {
- if (trans->local == local && trans->peer == peer)
- goto found_extant_transport;
- }
- read_unlock_bh(&rxrpc_transport_lock);
-
- /* not yet present - create a candidate for a new record and then
- * redo the search */
- candidate = rxrpc_alloc_transport(local, peer, gfp);
- if (!candidate) {
- _leave(" = -ENOMEM");
- return ERR_PTR(-ENOMEM);
- }
-
- write_lock_bh(&rxrpc_transport_lock);
-
- list_for_each_entry(trans, &rxrpc_transports, link) {
- if (trans->local == local && trans->peer == peer)
- goto found_extant_second;
- }
-
- /* we can now add the new candidate to the list */
- trans = candidate;
- candidate = NULL;
- usage = atomic_read(&trans->usage);
-
- rxrpc_get_local(trans->local);
- rxrpc_get_peer(trans->peer);
- list_add_tail(&trans->link, &rxrpc_transports);
- write_unlock_bh(&rxrpc_transport_lock);
- new = "new";
-
-success:
- _net("TRANSPORT %s %d local %d -> peer %d",
- new,
- trans->debug_id,
- trans->local->debug_id,
- trans->peer->debug_id);
-
- _leave(" = %p {u=%d}", trans, usage);
- return trans;
-
- /* we found the transport in the list immediately */
-found_extant_transport:
- usage = atomic_inc_return(&trans->usage);
- read_unlock_bh(&rxrpc_transport_lock);
- goto success;
-
- /* we found the transport on the second time through the list */
-found_extant_second:
- usage = atomic_inc_return(&trans->usage);
- write_unlock_bh(&rxrpc_transport_lock);
- kfree(candidate);
- goto success;
-}
-
-/*
- * find the transport connecting two endpoints
- */
-struct rxrpc_transport *rxrpc_find_transport(struct rxrpc_local *local,
- struct rxrpc_peer *peer)
-{
- struct rxrpc_transport *trans;
-
- _enter("{%pI4+%hu},{%pI4+%hu},",
- &local->srx.transport.sin.sin_addr,
- ntohs(local->srx.transport.sin.sin_port),
- &peer->srx.transport.sin.sin_addr,
- ntohs(peer->srx.transport.sin.sin_port));
-
- /* search the transport list */
- read_lock_bh(&rxrpc_transport_lock);
-
- list_for_each_entry(trans, &rxrpc_transports, link) {
- if (trans->local == local && trans->peer == peer)
- goto found_extant_transport;
- }
-
- read_unlock_bh(&rxrpc_transport_lock);
- _leave(" = NULL");
- return NULL;
-
-found_extant_transport:
- atomic_inc(&trans->usage);
- read_unlock_bh(&rxrpc_transport_lock);
- _leave(" = %p", trans);
- return trans;
-}
-
-/*
- * release a transport session
- */
-void rxrpc_put_transport(struct rxrpc_transport *trans)
-{
- _enter("%p{u=%d}", trans, atomic_read(&trans->usage));
-
- ASSERTCMP(atomic_read(&trans->usage), >, 0);
-
- trans->put_time = ktime_get_seconds();
- if (unlikely(atomic_dec_and_test(&trans->usage))) {
- _debug("zombie");
- /* let the reaper determine the timeout to avoid a race with
- * overextending the timeout if the reaper is running at the
- * same time */
- rxrpc_queue_delayed_work(&rxrpc_transport_reap, 0);
- }
- _leave("");
-}
-
-/*
- * clean up a transport session
- */
-static void rxrpc_cleanup_transport(struct rxrpc_transport *trans)
-{
- _net("DESTROY TRANS %d", trans->debug_id);
-
- rxrpc_put_local(trans->local);
- rxrpc_put_peer(trans->peer);
- kfree(trans);
-}
-
-/*
- * reap dead transports that have passed their expiry date
- */
-static void rxrpc_transport_reaper(struct work_struct *work)
-{
- struct rxrpc_transport *trans, *_p;
- unsigned long now, earliest, reap_time;
-
- LIST_HEAD(graveyard);
-
- _enter("");
-
- now = ktime_get_seconds();
- earliest = ULONG_MAX;
-
- /* extract all the transports that have been dead too long */
- write_lock_bh(&rxrpc_transport_lock);
- list_for_each_entry_safe(trans, _p, &rxrpc_transports, link) {
- _debug("reap TRANS %d { u=%d t=%ld }",
- trans->debug_id, atomic_read(&trans->usage),
- (long) now - (long) trans->put_time);
-
- if (likely(atomic_read(&trans->usage) > 0))
- continue;
-
- reap_time = trans->put_time + rxrpc_transport_expiry;
- if (reap_time <= now)
- list_move_tail(&trans->link, &graveyard);
- else if (reap_time < earliest)
- earliest = reap_time;
- }
- write_unlock_bh(&rxrpc_transport_lock);
-
- if (earliest != ULONG_MAX) {
- _debug("reschedule reaper %ld", (long) earliest - now);
- ASSERTCMP(earliest, >, now);
- rxrpc_queue_delayed_work(&rxrpc_transport_reap,
- (earliest - now) * HZ);
- }
-
- /* then destroy all those pulled out */
- while (!list_empty(&graveyard)) {
- trans = list_entry(graveyard.next, struct rxrpc_transport,
- link);
- list_del_init(&trans->link);
-
- ASSERTCMP(atomic_read(&trans->usage), ==, 0);
- rxrpc_cleanup_transport(trans);
- }
-
- _leave("");
-}
-
-/*
- * preemptively destroy all the transport session records rather than waiting
- * for them to time out
- */
-void __exit rxrpc_destroy_all_transports(void)
-{
- _enter("");
-
- rxrpc_transport_expiry = 0;
- cancel_delayed_work(&rxrpc_transport_reap);
- rxrpc_queue_delayed_work(&rxrpc_transport_reap, 0);
-
- _leave("");
-}
projects / GitHub / LineageOS / G12 / android_kernel_amlogic_linux-4.9.git / commitdiff