cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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local_event.c (2727B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/* AF_RXRPC local endpoint management
      3 *
      4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
      5 * Written by David Howells (dhowells@redhat.com)
      6 */
      7
      8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
      9
     10#include <linux/module.h>
     11#include <linux/net.h>
     12#include <linux/skbuff.h>
     13#include <linux/slab.h>
     14#include <net/sock.h>
     15#include <net/af_rxrpc.h>
     16#include <generated/utsrelease.h>
     17#include "ar-internal.h"
     18
     19static const char rxrpc_version_string[65] = "linux-" UTS_RELEASE " AF_RXRPC";
     20
     21/*
     22 * Reply to a version request
     23 */
     24static void rxrpc_send_version_request(struct rxrpc_local *local,
     25				       struct rxrpc_host_header *hdr,
     26				       struct sk_buff *skb)
     27{
     28	struct rxrpc_wire_header whdr;
     29	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
     30	struct sockaddr_rxrpc srx;
     31	struct msghdr msg;
     32	struct kvec iov[2];
     33	size_t len;
     34	int ret;
     35
     36	_enter("");
     37
     38	if (rxrpc_extract_addr_from_skb(&srx, skb) < 0)
     39		return;
     40
     41	msg.msg_name	= &srx.transport;
     42	msg.msg_namelen	= srx.transport_len;
     43	msg.msg_control	= NULL;
     44	msg.msg_controllen = 0;
     45	msg.msg_flags	= 0;
     46
     47	whdr.epoch	= htonl(sp->hdr.epoch);
     48	whdr.cid	= htonl(sp->hdr.cid);
     49	whdr.callNumber	= htonl(sp->hdr.callNumber);
     50	whdr.seq	= 0;
     51	whdr.serial	= 0;
     52	whdr.type	= RXRPC_PACKET_TYPE_VERSION;
     53	whdr.flags	= RXRPC_LAST_PACKET | (~hdr->flags & RXRPC_CLIENT_INITIATED);
     54	whdr.userStatus	= 0;
     55	whdr.securityIndex = 0;
     56	whdr._rsvd	= 0;
     57	whdr.serviceId	= htons(sp->hdr.serviceId);
     58
     59	iov[0].iov_base	= &whdr;
     60	iov[0].iov_len	= sizeof(whdr);
     61	iov[1].iov_base	= (char *)rxrpc_version_string;
     62	iov[1].iov_len	= sizeof(rxrpc_version_string);
     63
     64	len = iov[0].iov_len + iov[1].iov_len;
     65
     66	_proto("Tx VERSION (reply)");
     67
     68	ret = kernel_sendmsg(local->socket, &msg, iov, 2, len);
     69	if (ret < 0)
     70		trace_rxrpc_tx_fail(local->debug_id, 0, ret,
     71				    rxrpc_tx_point_version_reply);
     72	else
     73		trace_rxrpc_tx_packet(local->debug_id, &whdr,
     74				      rxrpc_tx_point_version_reply);
     75
     76	_leave("");
     77}
     78
     79/*
     80 * Process event packets targeted at a local endpoint.
     81 */
     82void rxrpc_process_local_events(struct rxrpc_local *local)
     83{
     84	struct sk_buff *skb;
     85	char v;
     86
     87	_enter("");
     88
     89	skb = skb_dequeue(&local->event_queue);
     90	if (skb) {
     91		struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
     92
     93		rxrpc_see_skb(skb, rxrpc_skb_seen);
     94		_debug("{%d},{%u}", local->debug_id, sp->hdr.type);
     95
     96		switch (sp->hdr.type) {
     97		case RXRPC_PACKET_TYPE_VERSION:
     98			if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
     99					  &v, 1) < 0)
    100				return;
    101			_proto("Rx VERSION { %02x }", v);
    102			if (v == 0)
    103				rxrpc_send_version_request(local, &sp->hdr, skb);
    104			break;
    105
    106		default:
    107			/* Just ignore anything we don't understand */
    108			break;
    109		}
    110
    111		rxrpc_free_skb(skb, rxrpc_skb_freed);
    112	}
    113
    114	_leave("");
    115}