call_accept.c | Explore in Territory

// SPDX-License-Identifier: GPL-2.0-or-later
/* incoming call handling
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 */

#define pr_fmt(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,
				      unsigned int debug_id)
{ … }

/*
 * Allocate the preallocation buffers for incoming service calls.  These must
 * be charged manually.
 */
int rxrpc_service_prealloc(struct rxrpc_sock *rx, gfp_t gfp)
{ … }

/*
 * Discard the preallocation on a service.
 */
void rxrpc_discard_prealloc(struct rxrpc_sock *rx)
{ … }

/*
 * 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_peer *peer,
						    struct rxrpc_connection *conn,
						    const struct rxrpc_security *sec,
						    struct sockaddr_rxrpc *peer_srx,
						    struct sk_buff *skb)
{ … }

/*
 * Set up a new incoming call.  Called from the I/O thread.
 *
 * 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.
 *
 * If we want to report an error, we mark the skb with the packet type and
 * abort code and return false.
 */
bool rxrpc_new_incoming_call(struct rxrpc_local *local,
			     struct rxrpc_peer *peer,
			     struct rxrpc_connection *conn,
			     struct sockaddr_rxrpc *peer_srx,
			     struct sk_buff *skb)
{ … }

/*
 * Charge up socket with preallocated calls, attaching user call IDs.
 */
int rxrpc_user_charge_accept(struct rxrpc_sock *rx, unsigned long user_call_ID)
{ … }

/*
 * 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.
 * @debug_id: The tracing debug ID.
 *
 * 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,
			       unsigned int debug_id)
{ … }
EXPORT_SYMBOL(…);
linux/net/rxrpc/call_accept.c
