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 char rxrpc_version_string[65]; // "linux-" UTS_RELEASE " AF_RXRPC"; 20 21 /* 22 * Generate the VERSION packet string. 23 */ 24 void rxrpc_gen_version_string(void) 25 { 26 snprintf(rxrpc_version_string, sizeof(rxrpc_version_string), 27 "linux-%.49s AF_RXRPC", UTS_RELEASE); 28 } 29 30 /* 31 * Reply to a version request 32 */ 33 void rxrpc_send_version_request(struct rxrpc_local *local, 34 struct rxrpc_host_header *hdr, 35 struct sk_buff *skb) 36 { 37 struct rxrpc_wire_header whdr; 38 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 39 struct sockaddr_rxrpc srx; 40 struct msghdr msg; 41 struct kvec iov[2]; 42 size_t len; 43 int ret; 44 45 _enter(""); 46 47 if (rxrpc_extract_addr_from_skb(&srx, skb) < 0) 48 return; 49 50 msg.msg_name = &srx.transport; 51 msg.msg_namelen = srx.transport_len; 52 msg.msg_control = NULL; 53 msg.msg_controllen = 0; 54 msg.msg_flags = 0; 55 56 whdr.epoch = htonl(sp->hdr.epoch); 57 whdr.cid = htonl(sp->hdr.cid); 58 whdr.callNumber = htonl(sp->hdr.callNumber); 59 whdr.seq = 0; 60 whdr.serial = 0; 61 whdr.type = RXRPC_PACKET_TYPE_VERSION; 62 whdr.flags = RXRPC_LAST_PACKET | (~hdr->flags & RXRPC_CLIENT_INITIATED); 63 whdr.userStatus = 0; 64 whdr.securityIndex = 0; 65 whdr._rsvd = 0; 66 whdr.serviceId = htons(sp->hdr.serviceId); 67 68 iov[0].iov_base = &whdr; 69 iov[0].iov_len = sizeof(whdr); 70 iov[1].iov_base = (char *)rxrpc_version_string; 71 iov[1].iov_len = sizeof(rxrpc_version_string); 72 73 len = iov[0].iov_len + iov[1].iov_len; 74 75 ret = kernel_sendmsg(local->socket, &msg, iov, 2, len); 76 if (ret < 0) 77 trace_rxrpc_tx_fail(local->debug_id, 0, ret, 78 rxrpc_tx_point_version_reply); 79 else 80 trace_rxrpc_tx_packet(local->debug_id, &whdr, 81 rxrpc_tx_point_version_reply); 82 83 _leave(""); 84 } 85