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 targeted 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 } 116