Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-or-later
/* AF_RXRPC local endpoint management
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 */
 
#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 <generated/utsrelease.h>
#include "ar-internal.h"
 
static const char rxrpc_version_string[65] = "linux-" UTS_RELEASE " AF_RXRPC";
 
/*
 * Reply to a version request
 */
static void rxrpc_send_version_request(struct rxrpc_local *local,
<------><------><------><------>       struct rxrpc_host_header *hdr,
<------><------><------><------>       struct sk_buff *skb)
{
<------>struct rxrpc_wire_header whdr;
<------>struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
<------>struct sockaddr_rxrpc srx;
<------>struct msghdr msg;
<------>struct kvec iov[2];
<------>size_t len;
<------>int ret;
 
<------>_enter("");
 
<------>if (rxrpc_extract_addr_from_skb(&srx, skb) < 0)
<------><------>return;
 
<------>msg.msg_name	= &srx.transport;
<------>msg.msg_namelen	= srx.transport_len;
<------>msg.msg_control	= NULL;
<------>msg.msg_controllen = 0;
<------>msg.msg_flags	= 0;
 
<------>whdr.epoch	= htonl(sp->hdr.epoch);
<------>whdr.cid	= htonl(sp->hdr.cid);
<------>whdr.callNumber	= htonl(sp->hdr.callNumber);
<------>whdr.seq	= 0;
<------>whdr.serial	= 0;
<------>whdr.type	= RXRPC_PACKET_TYPE_VERSION;
<------>whdr.flags	= RXRPC_LAST_PACKET | (~hdr->flags & RXRPC_CLIENT_INITIATED);
<------>whdr.userStatus	= 0;
<------>whdr.securityIndex = 0;
<------>whdr._rsvd	= 0;
<------>whdr.serviceId	= htons(sp->hdr.serviceId);
 
<------>iov[0].iov_base	= &whdr;
<------>iov[0].iov_len	= sizeof(whdr);
<------>iov[1].iov_base	= (char *)rxrpc_version_string;
<------>iov[1].iov_len	= sizeof(rxrpc_version_string);
 
<------>len = iov[0].iov_len + iov[1].iov_len;
 
<------>_proto("Tx VERSION (reply)");
 
<------>ret = kernel_sendmsg(local->socket, &msg, iov, 2, len);
<------>if (ret < 0)
<------><------>trace_rxrpc_tx_fail(local->debug_id, 0, ret,
<------><------><------><------>    rxrpc_tx_point_version_reply);
<------>else
<------><------>trace_rxrpc_tx_packet(local->debug_id, &whdr,
<------><------><------><------>      rxrpc_tx_point_version_reply);
 
<------>_leave("");
}
 
/*
 * Process event packets targetted at a local endpoint.
 */
void rxrpc_process_local_events(struct rxrpc_local *local)
{
<------>struct sk_buff *skb;
<------>char v;
 
<------>_enter("");
 
<------>skb = skb_dequeue(&local->event_queue);
<------>if (skb) {
<------><------>struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 
<------><------>rxrpc_see_skb(skb, rxrpc_skb_seen);
<------><------>_debug("{%d},{%u}", local->debug_id, sp->hdr.type);
 
<------><------>switch (sp->hdr.type) {
<------><------>case RXRPC_PACKET_TYPE_VERSION:
<------><------><------>if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
<------><------><------><------><------>  &v, 1) < 0)
<------><------><------><------>return;
<------><------><------>_proto("Rx VERSION { %02x }", v);
<------><------><------>if (v == 0)
<------><------><------><------>rxrpc_send_version_request(local, &sp->hdr, skb);
<------><------><------>break;
 
<------><------>default:
<------><------><------>/* Just ignore anything we don't understand */
<------><------><------>break;
<------><------>}
 
<------><------>rxrpc_free_skb(skb, rxrpc_skb_freed);
<------>}
 
<------>_leave("");
}