mirror of https://gitee.com/openkylin/linux.git
117 lines
2.7 KiB
C
117 lines
2.7 KiB
C
/* AF_RXRPC local endpoint management
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/net.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include <linux/udp.h>
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#include <linux/ip.h>
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#include <net/sock.h>
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#include <net/af_rxrpc.h>
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#include <generated/utsrelease.h>
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#include "ar-internal.h"
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static const char rxrpc_version_string[65] = "linux-" UTS_RELEASE " AF_RXRPC";
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/*
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* Reply to a version request
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*/
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static void rxrpc_send_version_request(struct rxrpc_local *local,
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struct rxrpc_host_header *hdr,
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struct sk_buff *skb)
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{
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struct rxrpc_wire_header whdr;
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struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
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struct sockaddr_in sin;
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struct msghdr msg;
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struct kvec iov[2];
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size_t len;
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int ret;
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_enter("");
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sin.sin_family = AF_INET;
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sin.sin_port = udp_hdr(skb)->source;
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sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
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msg.msg_name = &sin;
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msg.msg_namelen = sizeof(sin);
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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msg.msg_flags = 0;
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whdr.epoch = htonl(sp->hdr.epoch);
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whdr.cid = htonl(sp->hdr.cid);
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whdr.callNumber = htonl(sp->hdr.callNumber);
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whdr.seq = 0;
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whdr.serial = 0;
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whdr.type = RXRPC_PACKET_TYPE_VERSION;
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whdr.flags = RXRPC_LAST_PACKET | (~hdr->flags & RXRPC_CLIENT_INITIATED);
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whdr.userStatus = 0;
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whdr.securityIndex = 0;
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whdr._rsvd = 0;
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whdr.serviceId = htons(sp->hdr.serviceId);
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iov[0].iov_base = &whdr;
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iov[0].iov_len = sizeof(whdr);
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iov[1].iov_base = (char *)rxrpc_version_string;
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iov[1].iov_len = sizeof(rxrpc_version_string);
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len = iov[0].iov_len + iov[1].iov_len;
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_proto("Tx VERSION (reply)");
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ret = kernel_sendmsg(local->socket, &msg, iov, 2, len);
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if (ret < 0)
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_debug("sendmsg failed: %d", ret);
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_leave("");
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}
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/*
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* Process event packets targetted at a local endpoint.
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*/
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void rxrpc_process_local_events(struct rxrpc_local *local)
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{
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struct sk_buff *skb;
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char v;
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_enter("");
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skb = skb_dequeue(&local->event_queue);
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if (skb) {
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struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
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_debug("{%d},{%u}", local->debug_id, sp->hdr.type);
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switch (sp->hdr.type) {
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case RXRPC_PACKET_TYPE_VERSION:
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if (skb_copy_bits(skb, 0, &v, 1) < 0)
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return;
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_proto("Rx VERSION { %02x }", v);
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if (v == 0)
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rxrpc_send_version_request(local, &sp->hdr, skb);
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break;
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default:
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/* Just ignore anything we don't understand */
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break;
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}
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rxrpc_free_skb(skb);
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}
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_leave("");
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}
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