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 23 static const char rxrpc_version_string[65] = "linux-" UTS_RELEASE " AF_RXRPC"; 24 25 /* 26 * Reply to a version request 27 */ 28 static 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 */ 83 void 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