614 lines
17 KiB
C
614 lines
17 KiB
C
/* incoming call handling
|
|
*
|
|
* 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/errqueue.h>
|
|
#include <linux/udp.h>
|
|
#include <linux/in.h>
|
|
#include <linux/in6.h>
|
|
#include <linux/icmp.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/circ_buf.h>
|
|
#include <net/sock.h>
|
|
#include <net/af_rxrpc.h>
|
|
#include <net/ip.h>
|
|
#include "ar-internal.h"
|
|
|
|
static void rxrpc_dummy_notify(struct sock *sk, struct rxrpc_call *call,
|
|
unsigned long user_call_ID)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* Preallocate a single service call, connection and peer and, if possible,
|
|
* give them a user ID and attach the user's side of the ID to them.
|
|
*/
|
|
static int rxrpc_service_prealloc_one(struct rxrpc_sock *rx,
|
|
struct rxrpc_backlog *b,
|
|
rxrpc_notify_rx_t notify_rx,
|
|
rxrpc_user_attach_call_t user_attach_call,
|
|
unsigned long user_call_ID, gfp_t gfp)
|
|
{
|
|
const void *here = __builtin_return_address(0);
|
|
struct rxrpc_call *call;
|
|
int max, tmp;
|
|
unsigned int size = RXRPC_BACKLOG_MAX;
|
|
unsigned int head, tail, call_head, call_tail;
|
|
|
|
max = rx->sk.sk_max_ack_backlog;
|
|
tmp = rx->sk.sk_ack_backlog;
|
|
if (tmp >= max) {
|
|
_leave(" = -ENOBUFS [full %u]", max);
|
|
return -ENOBUFS;
|
|
}
|
|
max -= tmp;
|
|
|
|
/* We don't need more conns and peers than we have calls, but on the
|
|
* other hand, we shouldn't ever use more peers than conns or conns
|
|
* than calls.
|
|
*/
|
|
call_head = b->call_backlog_head;
|
|
call_tail = READ_ONCE(b->call_backlog_tail);
|
|
tmp = CIRC_CNT(call_head, call_tail, size);
|
|
if (tmp >= max) {
|
|
_leave(" = -ENOBUFS [enough %u]", tmp);
|
|
return -ENOBUFS;
|
|
}
|
|
max = tmp + 1;
|
|
|
|
head = b->peer_backlog_head;
|
|
tail = READ_ONCE(b->peer_backlog_tail);
|
|
if (CIRC_CNT(head, tail, size) < max) {
|
|
struct rxrpc_peer *peer = rxrpc_alloc_peer(rx->local, gfp);
|
|
if (!peer)
|
|
return -ENOMEM;
|
|
b->peer_backlog[head] = peer;
|
|
smp_store_release(&b->peer_backlog_head,
|
|
(head + 1) & (size - 1));
|
|
}
|
|
|
|
head = b->conn_backlog_head;
|
|
tail = READ_ONCE(b->conn_backlog_tail);
|
|
if (CIRC_CNT(head, tail, size) < max) {
|
|
struct rxrpc_connection *conn;
|
|
|
|
conn = rxrpc_prealloc_service_connection(gfp);
|
|
if (!conn)
|
|
return -ENOMEM;
|
|
b->conn_backlog[head] = conn;
|
|
smp_store_release(&b->conn_backlog_head,
|
|
(head + 1) & (size - 1));
|
|
|
|
trace_rxrpc_conn(conn, rxrpc_conn_new_service,
|
|
atomic_read(&conn->usage), here);
|
|
}
|
|
|
|
/* Now it gets complicated, because calls get registered with the
|
|
* socket here, particularly if a user ID is preassigned by the user.
|
|
*/
|
|
call = rxrpc_alloc_call(gfp);
|
|
if (!call)
|
|
return -ENOMEM;
|
|
call->flags |= (1 << RXRPC_CALL_IS_SERVICE);
|
|
call->state = RXRPC_CALL_SERVER_PREALLOC;
|
|
|
|
trace_rxrpc_call(call, rxrpc_call_new_service,
|
|
atomic_read(&call->usage),
|
|
here, (const void *)user_call_ID);
|
|
|
|
write_lock(&rx->call_lock);
|
|
if (user_attach_call) {
|
|
struct rxrpc_call *xcall;
|
|
struct rb_node *parent, **pp;
|
|
|
|
/* Check the user ID isn't already in use */
|
|
pp = &rx->calls.rb_node;
|
|
parent = NULL;
|
|
while (*pp) {
|
|
parent = *pp;
|
|
xcall = rb_entry(parent, struct rxrpc_call, sock_node);
|
|
if (user_call_ID < call->user_call_ID)
|
|
pp = &(*pp)->rb_left;
|
|
else if (user_call_ID > call->user_call_ID)
|
|
pp = &(*pp)->rb_right;
|
|
else
|
|
goto id_in_use;
|
|
}
|
|
|
|
call->user_call_ID = user_call_ID;
|
|
call->notify_rx = notify_rx;
|
|
rxrpc_get_call(call, rxrpc_call_got_kernel);
|
|
user_attach_call(call, user_call_ID);
|
|
rxrpc_get_call(call, rxrpc_call_got_userid);
|
|
rb_link_node(&call->sock_node, parent, pp);
|
|
rb_insert_color(&call->sock_node, &rx->calls);
|
|
set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
|
|
}
|
|
|
|
list_add(&call->sock_link, &rx->sock_calls);
|
|
|
|
write_unlock(&rx->call_lock);
|
|
|
|
write_lock(&rxrpc_call_lock);
|
|
list_add_tail(&call->link, &rxrpc_calls);
|
|
write_unlock(&rxrpc_call_lock);
|
|
|
|
b->call_backlog[call_head] = call;
|
|
smp_store_release(&b->call_backlog_head, (call_head + 1) & (size - 1));
|
|
_leave(" = 0 [%d -> %lx]", call->debug_id, user_call_ID);
|
|
return 0;
|
|
|
|
id_in_use:
|
|
write_unlock(&rx->call_lock);
|
|
rxrpc_cleanup_call(call);
|
|
_leave(" = -EBADSLT");
|
|
return -EBADSLT;
|
|
}
|
|
|
|
/*
|
|
* Preallocate sufficient service connections, calls and peers to cover the
|
|
* entire backlog of a socket. When a new call comes in, if we don't have
|
|
* sufficient of each available, the call gets rejected as busy or ignored.
|
|
*
|
|
* The backlog is replenished when a connection is accepted or rejected.
|
|
*/
|
|
int rxrpc_service_prealloc(struct rxrpc_sock *rx, gfp_t gfp)
|
|
{
|
|
struct rxrpc_backlog *b = rx->backlog;
|
|
|
|
if (!b) {
|
|
b = kzalloc(sizeof(struct rxrpc_backlog), gfp);
|
|
if (!b)
|
|
return -ENOMEM;
|
|
rx->backlog = b;
|
|
}
|
|
|
|
if (rx->discard_new_call)
|
|
return 0;
|
|
|
|
while (rxrpc_service_prealloc_one(rx, b, NULL, NULL, 0, gfp) == 0)
|
|
;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Discard the preallocation on a service.
|
|
*/
|
|
void rxrpc_discard_prealloc(struct rxrpc_sock *rx)
|
|
{
|
|
struct rxrpc_backlog *b = rx->backlog;
|
|
unsigned int size = RXRPC_BACKLOG_MAX, head, tail;
|
|
|
|
if (!b)
|
|
return;
|
|
rx->backlog = NULL;
|
|
|
|
/* Make sure that there aren't any incoming calls in progress before we
|
|
* clear the preallocation buffers.
|
|
*/
|
|
spin_lock_bh(&rx->incoming_lock);
|
|
spin_unlock_bh(&rx->incoming_lock);
|
|
|
|
head = b->peer_backlog_head;
|
|
tail = b->peer_backlog_tail;
|
|
while (CIRC_CNT(head, tail, size) > 0) {
|
|
struct rxrpc_peer *peer = b->peer_backlog[tail];
|
|
kfree(peer);
|
|
tail = (tail + 1) & (size - 1);
|
|
}
|
|
|
|
head = b->conn_backlog_head;
|
|
tail = b->conn_backlog_tail;
|
|
while (CIRC_CNT(head, tail, size) > 0) {
|
|
struct rxrpc_connection *conn = b->conn_backlog[tail];
|
|
write_lock(&rxrpc_connection_lock);
|
|
list_del(&conn->link);
|
|
list_del(&conn->proc_link);
|
|
write_unlock(&rxrpc_connection_lock);
|
|
kfree(conn);
|
|
tail = (tail + 1) & (size - 1);
|
|
}
|
|
|
|
head = b->call_backlog_head;
|
|
tail = b->call_backlog_tail;
|
|
while (CIRC_CNT(head, tail, size) > 0) {
|
|
struct rxrpc_call *call = b->call_backlog[tail];
|
|
if (rx->discard_new_call) {
|
|
_debug("discard %lx", call->user_call_ID);
|
|
rx->discard_new_call(call, call->user_call_ID);
|
|
if (call->notify_rx)
|
|
call->notify_rx = rxrpc_dummy_notify;
|
|
rxrpc_put_call(call, rxrpc_call_put_kernel);
|
|
}
|
|
rxrpc_call_completed(call);
|
|
rxrpc_release_call(rx, call);
|
|
rxrpc_put_call(call, rxrpc_call_put);
|
|
tail = (tail + 1) & (size - 1);
|
|
}
|
|
|
|
kfree(b);
|
|
}
|
|
|
|
/*
|
|
* Allocate a new incoming call from the prealloc pool, along with a connection
|
|
* and a peer as necessary.
|
|
*/
|
|
static struct rxrpc_call *rxrpc_alloc_incoming_call(struct rxrpc_sock *rx,
|
|
struct rxrpc_local *local,
|
|
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;
|
|
unsigned short call_count, conn_count;
|
|
|
|
/* #calls >= #conns >= #peers must hold true. */
|
|
call_head = smp_load_acquire(&b->call_backlog_head);
|
|
call_tail = b->call_backlog_tail;
|
|
call_count = CIRC_CNT(call_head, call_tail, RXRPC_BACKLOG_MAX);
|
|
conn_head = smp_load_acquire(&b->conn_backlog_head);
|
|
conn_tail = b->conn_backlog_tail;
|
|
conn_count = CIRC_CNT(conn_head, conn_tail, RXRPC_BACKLOG_MAX);
|
|
ASSERTCMP(conn_count, >=, call_count);
|
|
peer_head = smp_load_acquire(&b->peer_backlog_head);
|
|
peer_tail = b->peer_backlog_tail;
|
|
ASSERTCMP(CIRC_CNT(peer_head, peer_tail, RXRPC_BACKLOG_MAX), >=,
|
|
conn_count);
|
|
|
|
if (call_count == 0)
|
|
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(&xpeer->srx, skb) < 0)
|
|
return NULL;
|
|
|
|
peer = rxrpc_lookup_incoming_peer(local, xpeer);
|
|
if (peer == xpeer) {
|
|
b->peer_backlog[peer_tail] = NULL;
|
|
smp_store_release(&b->peer_backlog_tail,
|
|
(peer_tail + 1) &
|
|
(RXRPC_BACKLOG_MAX - 1));
|
|
}
|
|
|
|
/* Now allocate and set up the connection */
|
|
conn = b->conn_backlog[conn_tail];
|
|
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.peer = peer;
|
|
rxrpc_see_connection(conn);
|
|
rxrpc_new_incoming_connection(conn, skb);
|
|
} else {
|
|
rxrpc_get_connection(conn);
|
|
}
|
|
|
|
/* And now we can allocate and set up a new call */
|
|
call = b->call_backlog[call_tail];
|
|
b->call_backlog[call_tail] = NULL;
|
|
smp_store_release(&b->call_backlog_tail,
|
|
(call_tail + 1) & (RXRPC_BACKLOG_MAX - 1));
|
|
|
|
rxrpc_see_call(call);
|
|
call->conn = conn;
|
|
call->peer = rxrpc_get_peer(conn->params.peer);
|
|
return call;
|
|
}
|
|
|
|
/*
|
|
* Set up a new incoming call. Called in BH context with the RCU read lock
|
|
* held.
|
|
*
|
|
* If this is for a kernel service, when we allocate the call, it will have
|
|
* three refs on it: (1) the kernel service, (2) the user_call_ID tree, (3) the
|
|
* retainer ref obtained from the backlog buffer. Prealloc calls for userspace
|
|
* services only have the ref from the backlog buffer. We want to pass this
|
|
* ref to non-BH context to dispose of.
|
|
*
|
|
* If we want to report an error, we mark the skb with the packet type and
|
|
* abort code and return NULL.
|
|
*/
|
|
struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *local,
|
|
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)
|
|
goto found_service;
|
|
|
|
trace_rxrpc_abort("INV", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
|
|
RX_INVALID_OPERATION, EOPNOTSUPP);
|
|
skb->mark = RXRPC_SKB_MARK_LOCAL_ABORT;
|
|
skb->priority = RX_INVALID_OPERATION;
|
|
_leave(" = NULL [service]");
|
|
return NULL;
|
|
|
|
found_service:
|
|
spin_lock(&rx->incoming_lock);
|
|
if (rx->sk.sk_state == RXRPC_CLOSE) {
|
|
trace_rxrpc_abort("CLS", sp->hdr.cid, sp->hdr.callNumber,
|
|
sp->hdr.seq, RX_INVALID_OPERATION, ESHUTDOWN);
|
|
skb->mark = RXRPC_SKB_MARK_LOCAL_ABORT;
|
|
skb->priority = RX_INVALID_OPERATION;
|
|
_leave(" = NULL [close]");
|
|
call = NULL;
|
|
goto out;
|
|
}
|
|
|
|
call = rxrpc_alloc_incoming_call(rx, local, conn, skb);
|
|
if (!call) {
|
|
skb->mark = RXRPC_SKB_MARK_BUSY;
|
|
_leave(" = NULL [busy]");
|
|
call = NULL;
|
|
goto out;
|
|
}
|
|
|
|
trace_rxrpc_receive(call, rxrpc_receive_incoming,
|
|
sp->hdr.serial, sp->hdr.seq);
|
|
|
|
/* Make the call live. */
|
|
rxrpc_incoming_call(rx, call, skb);
|
|
conn = call->conn;
|
|
|
|
if (rx->notify_new_call)
|
|
rx->notify_new_call(&rx->sk, call, call->user_call_ID);
|
|
else
|
|
sk_acceptq_added(&rx->sk);
|
|
|
|
spin_lock(&conn->state_lock);
|
|
switch (conn->state) {
|
|
case RXRPC_CONN_SERVICE_UNSECURED:
|
|
conn->state = RXRPC_CONN_SERVICE_CHALLENGING;
|
|
set_bit(RXRPC_CONN_EV_CHALLENGE, &call->conn->events);
|
|
rxrpc_queue_conn(call->conn);
|
|
break;
|
|
|
|
case RXRPC_CONN_SERVICE:
|
|
write_lock(&call->state_lock);
|
|
if (rx->discard_new_call)
|
|
call->state = RXRPC_CALL_SERVER_RECV_REQUEST;
|
|
else
|
|
call->state = RXRPC_CALL_SERVER_ACCEPTING;
|
|
write_unlock(&call->state_lock);
|
|
break;
|
|
|
|
case RXRPC_CONN_REMOTELY_ABORTED:
|
|
rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED,
|
|
conn->remote_abort, ECONNABORTED);
|
|
break;
|
|
case RXRPC_CONN_LOCALLY_ABORTED:
|
|
rxrpc_abort_call("CON", call, sp->hdr.seq,
|
|
conn->local_abort, ECONNABORTED);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
spin_unlock(&conn->state_lock);
|
|
|
|
if (call->state == RXRPC_CALL_SERVER_ACCEPTING)
|
|
rxrpc_notify_socket(call);
|
|
|
|
/* We have to discard the prealloc queue's ref here and rely on a
|
|
* combination of the RCU read lock and refs held either by the socket
|
|
* (recvmsg queue, to-be-accepted queue or user ID tree) or the kernel
|
|
* service to prevent the call from being deallocated too early.
|
|
*/
|
|
rxrpc_put_call(call, rxrpc_call_put);
|
|
|
|
_leave(" = %p{%d}", call, call->debug_id);
|
|
out:
|
|
spin_unlock(&rx->incoming_lock);
|
|
return call;
|
|
}
|
|
|
|
/*
|
|
* handle acceptance of a call by userspace
|
|
* - assign the user call ID to the call at the front of the queue
|
|
*/
|
|
struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *rx,
|
|
unsigned long user_call_ID,
|
|
rxrpc_notify_rx_t notify_rx)
|
|
{
|
|
struct rxrpc_call *call;
|
|
struct rb_node *parent, **pp;
|
|
int ret;
|
|
|
|
_enter(",%lx", user_call_ID);
|
|
|
|
ASSERT(!irqs_disabled());
|
|
|
|
write_lock(&rx->call_lock);
|
|
|
|
if (list_empty(&rx->to_be_accepted)) {
|
|
write_unlock(&rx->call_lock);
|
|
kleave(" = -ENODATA [empty]");
|
|
return ERR_PTR(-ENODATA);
|
|
}
|
|
|
|
/* check the user ID isn't already in use */
|
|
pp = &rx->calls.rb_node;
|
|
parent = NULL;
|
|
while (*pp) {
|
|
parent = *pp;
|
|
call = rb_entry(parent, struct rxrpc_call, sock_node);
|
|
|
|
if (user_call_ID < call->user_call_ID)
|
|
pp = &(*pp)->rb_left;
|
|
else if (user_call_ID > call->user_call_ID)
|
|
pp = &(*pp)->rb_right;
|
|
else
|
|
goto id_in_use;
|
|
}
|
|
|
|
/* Dequeue the first call and check it's still valid. We gain
|
|
* responsibility for the queue's reference.
|
|
*/
|
|
call = list_entry(rx->to_be_accepted.next,
|
|
struct rxrpc_call, accept_link);
|
|
list_del_init(&call->accept_link);
|
|
sk_acceptq_removed(&rx->sk);
|
|
rxrpc_see_call(call);
|
|
|
|
write_lock_bh(&call->state_lock);
|
|
switch (call->state) {
|
|
case RXRPC_CALL_SERVER_ACCEPTING:
|
|
call->state = RXRPC_CALL_SERVER_RECV_REQUEST;
|
|
break;
|
|
case RXRPC_CALL_COMPLETE:
|
|
ret = call->error;
|
|
goto out_release;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
/* formalise the acceptance */
|
|
call->notify_rx = notify_rx;
|
|
call->user_call_ID = user_call_ID;
|
|
rxrpc_get_call(call, rxrpc_call_got_userid);
|
|
rb_link_node(&call->sock_node, parent, pp);
|
|
rb_insert_color(&call->sock_node, &rx->calls);
|
|
if (test_and_set_bit(RXRPC_CALL_HAS_USERID, &call->flags))
|
|
BUG();
|
|
|
|
write_unlock_bh(&call->state_lock);
|
|
write_unlock(&rx->call_lock);
|
|
rxrpc_notify_socket(call);
|
|
rxrpc_service_prealloc(rx, GFP_KERNEL);
|
|
_leave(" = %p{%d}", call, call->debug_id);
|
|
return call;
|
|
|
|
out_release:
|
|
_debug("release %p", call);
|
|
write_unlock_bh(&call->state_lock);
|
|
write_unlock(&rx->call_lock);
|
|
rxrpc_release_call(rx, call);
|
|
rxrpc_put_call(call, rxrpc_call_put);
|
|
goto out;
|
|
|
|
id_in_use:
|
|
ret = -EBADSLT;
|
|
write_unlock(&rx->call_lock);
|
|
out:
|
|
rxrpc_service_prealloc(rx, GFP_KERNEL);
|
|
_leave(" = %d", ret);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
/*
|
|
* Handle rejection of a call by userspace
|
|
* - reject the call at the front of the queue
|
|
*/
|
|
int rxrpc_reject_call(struct rxrpc_sock *rx)
|
|
{
|
|
struct rxrpc_call *call;
|
|
bool abort = false;
|
|
int ret;
|
|
|
|
_enter("");
|
|
|
|
ASSERT(!irqs_disabled());
|
|
|
|
write_lock(&rx->call_lock);
|
|
|
|
if (list_empty(&rx->to_be_accepted)) {
|
|
write_unlock(&rx->call_lock);
|
|
return -ENODATA;
|
|
}
|
|
|
|
/* Dequeue the first call and check it's still valid. We gain
|
|
* responsibility for the queue's reference.
|
|
*/
|
|
call = list_entry(rx->to_be_accepted.next,
|
|
struct rxrpc_call, accept_link);
|
|
list_del_init(&call->accept_link);
|
|
sk_acceptq_removed(&rx->sk);
|
|
rxrpc_see_call(call);
|
|
|
|
write_lock_bh(&call->state_lock);
|
|
switch (call->state) {
|
|
case RXRPC_CALL_SERVER_ACCEPTING:
|
|
__rxrpc_abort_call("REJ", call, 1, RX_USER_ABORT, ECONNABORTED);
|
|
abort = true;
|
|
/* fall through */
|
|
case RXRPC_CALL_COMPLETE:
|
|
ret = call->error;
|
|
goto out_discard;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
out_discard:
|
|
write_unlock_bh(&call->state_lock);
|
|
write_unlock(&rx->call_lock);
|
|
if (abort) {
|
|
rxrpc_send_abort_packet(call);
|
|
rxrpc_release_call(rx, call);
|
|
rxrpc_put_call(call, rxrpc_call_put);
|
|
}
|
|
rxrpc_service_prealloc(rx, GFP_KERNEL);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* rxrpc_kernel_charge_accept - Charge up socket with preallocated calls
|
|
* @sock: The socket on which to preallocate
|
|
* @notify_rx: Event notification function for the call
|
|
* @user_attach_call: Func to attach call to user_call_ID
|
|
* @user_call_ID: The tag to attach to the preallocated call
|
|
* @gfp: The allocation conditions.
|
|
*
|
|
* Charge up the socket with preallocated calls, each with a user ID. A
|
|
* function should be provided to effect the attachment from the user's side.
|
|
* The user is given a ref to hold on the call.
|
|
*
|
|
* Note that the call may be come connected before this function returns.
|
|
*/
|
|
int rxrpc_kernel_charge_accept(struct socket *sock,
|
|
rxrpc_notify_rx_t notify_rx,
|
|
rxrpc_user_attach_call_t user_attach_call,
|
|
unsigned long user_call_ID, gfp_t gfp)
|
|
{
|
|
struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
|
|
struct rxrpc_backlog *b = rx->backlog;
|
|
|
|
if (sock->sk->sk_state == RXRPC_CLOSE)
|
|
return -ESHUTDOWN;
|
|
|
|
return rxrpc_service_prealloc_one(rx, b, notify_rx,
|
|
user_attach_call, user_call_ID,
|
|
gfp);
|
|
}
|
|
EXPORT_SYMBOL(rxrpc_kernel_charge_accept);
|