David Howells | 8756361 | 2016-04-04 14:00:34 +0100 | [diff] [blame^] | 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 <linux/udp.h> |
| 19 | #include <linux/ip.h> |
| 20 | #include <net/sock.h> |
| 21 | #include <net/af_rxrpc.h> |
| 22 | #include <generated/utsrelease.h> |
| 23 | #include "ar-internal.h" |
| 24 | |
| 25 | static const char rxrpc_version_string[65] = "linux-" UTS_RELEASE " AF_RXRPC"; |
| 26 | |
| 27 | /* |
| 28 | * Reply to a version request |
| 29 | */ |
| 30 | static void rxrpc_send_version_request(struct rxrpc_local *local, |
| 31 | struct rxrpc_host_header *hdr, |
| 32 | struct sk_buff *skb) |
| 33 | { |
| 34 | struct rxrpc_wire_header whdr; |
| 35 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
| 36 | struct sockaddr_in sin; |
| 37 | struct msghdr msg; |
| 38 | struct kvec iov[2]; |
| 39 | size_t len; |
| 40 | int ret; |
| 41 | |
| 42 | _enter(""); |
| 43 | |
| 44 | sin.sin_family = AF_INET; |
| 45 | sin.sin_port = udp_hdr(skb)->source; |
| 46 | sin.sin_addr.s_addr = ip_hdr(skb)->saddr; |
| 47 | |
| 48 | msg.msg_name = &sin; |
| 49 | msg.msg_namelen = sizeof(sin); |
| 50 | msg.msg_control = NULL; |
| 51 | msg.msg_controllen = 0; |
| 52 | msg.msg_flags = 0; |
| 53 | |
| 54 | whdr.epoch = htonl(sp->hdr.epoch); |
| 55 | whdr.cid = htonl(sp->hdr.cid); |
| 56 | whdr.callNumber = htonl(sp->hdr.callNumber); |
| 57 | whdr.seq = 0; |
| 58 | whdr.serial = 0; |
| 59 | whdr.type = RXRPC_PACKET_TYPE_VERSION; |
| 60 | whdr.flags = RXRPC_LAST_PACKET | (~hdr->flags & RXRPC_CLIENT_INITIATED); |
| 61 | whdr.userStatus = 0; |
| 62 | whdr.securityIndex = 0; |
| 63 | whdr._rsvd = 0; |
| 64 | whdr.serviceId = htons(sp->hdr.serviceId); |
| 65 | |
| 66 | iov[0].iov_base = &whdr; |
| 67 | iov[0].iov_len = sizeof(whdr); |
| 68 | iov[1].iov_base = (char *)rxrpc_version_string; |
| 69 | iov[1].iov_len = sizeof(rxrpc_version_string); |
| 70 | |
| 71 | len = iov[0].iov_len + iov[1].iov_len; |
| 72 | |
| 73 | _proto("Tx VERSION (reply)"); |
| 74 | |
| 75 | ret = kernel_sendmsg(local->socket, &msg, iov, 2, len); |
| 76 | if (ret < 0) |
| 77 | _debug("sendmsg failed: %d", ret); |
| 78 | |
| 79 | _leave(""); |
| 80 | } |
| 81 | |
| 82 | /* |
| 83 | * Process event packets targetted at a local endpoint. |
| 84 | */ |
| 85 | void rxrpc_process_local_events(struct work_struct *work) |
| 86 | { |
| 87 | struct rxrpc_local *local = container_of(work, struct rxrpc_local, event_processor); |
| 88 | struct sk_buff *skb; |
| 89 | char v; |
| 90 | |
| 91 | _enter(""); |
| 92 | |
| 93 | atomic_inc(&local->usage); |
| 94 | |
| 95 | while ((skb = skb_dequeue(&local->event_queue))) { |
| 96 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
| 97 | |
| 98 | _debug("{%d},{%u}", local->debug_id, sp->hdr.type); |
| 99 | |
| 100 | switch (sp->hdr.type) { |
| 101 | case RXRPC_PACKET_TYPE_VERSION: |
| 102 | if (skb_copy_bits(skb, 0, &v, 1) < 0) |
| 103 | return; |
| 104 | _proto("Rx VERSION { %02x }", v); |
| 105 | if (v == 0) |
| 106 | rxrpc_send_version_request(local, &sp->hdr, skb); |
| 107 | break; |
| 108 | |
| 109 | default: |
| 110 | /* Just ignore anything we don't understand */ |
| 111 | break; |
| 112 | } |
| 113 | |
| 114 | rxrpc_put_local(local); |
| 115 | rxrpc_free_skb(skb); |
| 116 | } |
| 117 | |
| 118 | rxrpc_put_local(local); |
| 119 | _leave(""); |
| 120 | } |