net/rxrpc/local_event.c

   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
  19 static const char rxrpc_version_string[65] = "linux-" UTS_RELEASE " AF_RXRPC";
  20
  21 /*
  22  * Reply to a version request
  23  */
  24 static 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 targetted at a local endpoint.
  81  */
  82 void 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 }