LXR linux/net/rxrpc/local

   1/* AF_RXRPC local endpoint management
   2 *
   3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4 * Written by David Howells (dhowells@redhat.com)
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License
   8 * as published by the Free Software Foundation; either version
   9 * 2 of the License, or (at your option) any later version.
  10 */
  11
  12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  13
  14#include <linux/module.h>
  15#include <linux/net.h>
  16#include <linux/skbuff.h>
  17#include <linux/slab.h>
  18#include <net/sock.h>
  19#include <net/af_rxrpc.h>
  20#include <generated/utsrelease.h>
  21#include "ar-internal.h"
  22
  23static const char rxrpc_version_string[65] = "linux-" UTS_RELEASE " AF_RXRPC";
  24
  25/*
  26 * Reply to a version request
  27 */
  28static void rxrpc_send_version_request(struct rxrpc_local *local,
  29                                       struct rxrpc_host_header *hdr,
  30                                       struct sk_buff *skb)
  31{
  32        struct rxrpc_wire_header whdr;
  33        struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
  34        struct sockaddr_rxrpc srx;
  35        struct msghdr msg;
  36        struct kvec iov[2];
  37        size_t len;
  38        int ret;
  39
  40        _enter("");
  41
  42        if (rxrpc_extract_addr_from_skb(local, &srx, skb) < 0)
  43                return;
  44
  45        msg.msg_name    = &srx.transport;
  46        msg.msg_namelen = srx.transport_len;
  47        msg.msg_control = NULL;
  48        msg.msg_controllen = 0;
  49        msg.msg_flags   = 0;
  50
  51        whdr.epoch      = htonl(sp->hdr.epoch);
  52        whdr.cid        = htonl(sp->hdr.cid);
  53        whdr.callNumber = htonl(sp->hdr.callNumber);
  54        whdr.seq        = 0;
  55        whdr.serial     = 0;
  56        whdr.type       = RXRPC_PACKET_TYPE_VERSION;
  57        whdr.flags      = RXRPC_LAST_PACKET | (~hdr->flags & RXRPC_CLIENT_INITIATED);
  58        whdr.userStatus = 0;
  59        whdr.securityIndex = 0;
  60        whdr._rsvd      = 0;
  61        whdr.serviceId  = htons(sp->hdr.serviceId);
  62
  63        iov[0].iov_base = &whdr;
  64        iov[0].iov_len  = sizeof(whdr);
  65        iov[1].iov_base = (char *)rxrpc_version_string;
  66        iov[1].iov_len  = sizeof(rxrpc_version_string);
  67
  68        len = iov[0].iov_len + iov[1].iov_len;
  69
  70        _proto("Tx VERSION (reply)");
  71
  72        ret = kernel_sendmsg(local->socket, &msg, iov, 2, len);
  73        if (ret < 0)
  74                trace_rxrpc_tx_fail(local->debug_id, 0, ret,
  75                                    rxrpc_tx_fail_version_reply);
  76
  77        _leave("");
  78}
  79
  80/*
  81 * Process event packets targetted at a local endpoint.
  82 */
  83void rxrpc_process_local_events(struct rxrpc_local *local)
  84{
  85        struct sk_buff *skb;
  86        char v;
  87
  88        _enter("");
  89
  90        skb = skb_dequeue(&local->event_queue);
  91        if (skb) {
  92                struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
  93
  94                rxrpc_see_skb(skb, rxrpc_skb_rx_seen);
  95                _debug("{%d},{%u}", local->debug_id, sp->hdr.type);
  96
  97                switch (sp->hdr.type) {
  98                case RXRPC_PACKET_TYPE_VERSION:
  99                        if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
 100                                          &v, 1) < 0)
 101                                return;
 102                        _proto("Rx VERSION { %02x }", v);
 103                        if (v == 0)
 104                                rxrpc_send_version_request(local, &sp->hdr, skb);
 105                        break;
 106
 107                default:
 108                        /* Just ignore anything we don't understand */
 109                        break;
 110                }
 111
 112                rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
 113        }
 114
 115        _leave("");
 116}
 117