forked from luck/tmp_suning_uos_patched
4d4a6ac73e
If we receive a BUSY packet for a call we think we've just completed, the packet is handed off to the connection processor to deal with - but the connection processor doesn't expect a BUSY packet and so flags a protocol error. Fix this by simply ignoring the BUSY packet for the moment. The symptom of this may appear as a system call failing with EPROTO. This may be triggered by pressing ctrl-C under some circumstances. This comes about we abort calls due to interruption by a signal (which we shouldn't do, but that's going to be a large fix and mostly in fs/afs/). What happens is that we abort the call and may also abort follow up calls too (this needs offloading somehoe). So we see a transmission of something like the following sequence of packets: DATA for call N ABORT call N DATA for call N+1 ABORT call N+1 in very quick succession on the same channel. However, the peer may have deferred the processing of the ABORT from the call N to a background thread and thus sees the DATA message from the call N+1 coming in before it has cleared the channel. Thus it sends a BUSY packet[*]. [*] Note that some implementations (OpenAFS, for example) mark the BUSY packet with one plus the callNumber of the call prior to call N. Ordinarily, this would be call N, but there's no requirement for the calls on a channel to be numbered strictly sequentially (the number is required to increase). This is wrong and means that the callNumber in the BUSY packet should be ignored (it really ought to be N+1 since that's what it's in response to). Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
428 lines
10 KiB
C
428 lines
10 KiB
C
/* connection-level event handling
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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/errqueue.h>
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#include <net/sock.h>
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#include <net/af_rxrpc.h>
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#include <net/ip.h>
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#include "ar-internal.h"
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/*
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* Retransmit terminal ACK or ABORT of the previous call.
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*/
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static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
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struct sk_buff *skb)
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{
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struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
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struct rxrpc_channel *chan;
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struct msghdr msg;
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struct kvec iov;
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struct {
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struct rxrpc_wire_header whdr;
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union {
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struct {
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__be32 code;
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} abort;
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struct {
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struct rxrpc_ackpacket ack;
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u8 padding[3];
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struct rxrpc_ackinfo info;
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};
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};
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} __attribute__((packed)) pkt;
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size_t len;
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u32 serial, mtu, call_id;
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_enter("%d", conn->debug_id);
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chan = &conn->channels[sp->hdr.cid & RXRPC_CHANNELMASK];
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/* If the last call got moved on whilst we were waiting to run, just
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* ignore this packet.
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*/
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call_id = READ_ONCE(chan->last_call);
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/* Sync with __rxrpc_disconnect_call() */
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smp_rmb();
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if (call_id != sp->hdr.callNumber)
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return;
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msg.msg_name = &conn->params.peer->srx.transport;
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msg.msg_namelen = conn->params.peer->srx.transport_len;
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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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pkt.whdr.epoch = htonl(sp->hdr.epoch);
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pkt.whdr.cid = htonl(sp->hdr.cid);
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pkt.whdr.callNumber = htonl(sp->hdr.callNumber);
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pkt.whdr.seq = 0;
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pkt.whdr.type = chan->last_type;
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pkt.whdr.flags = conn->out_clientflag;
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pkt.whdr.userStatus = 0;
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pkt.whdr.securityIndex = conn->security_ix;
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pkt.whdr._rsvd = 0;
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pkt.whdr.serviceId = htons(chan->last_service_id);
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len = sizeof(pkt.whdr);
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switch (chan->last_type) {
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case RXRPC_PACKET_TYPE_ABORT:
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pkt.abort.code = htonl(chan->last_abort);
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len += sizeof(pkt.abort);
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break;
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case RXRPC_PACKET_TYPE_ACK:
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mtu = conn->params.peer->if_mtu;
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mtu -= conn->params.peer->hdrsize;
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pkt.ack.bufferSpace = 0;
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pkt.ack.maxSkew = htons(skb->priority);
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pkt.ack.firstPacket = htonl(chan->last_seq);
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pkt.ack.previousPacket = htonl(chan->last_seq - 1);
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pkt.ack.serial = htonl(sp->hdr.serial);
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pkt.ack.reason = RXRPC_ACK_DUPLICATE;
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pkt.ack.nAcks = 0;
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pkt.info.rxMTU = htonl(rxrpc_rx_mtu);
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pkt.info.maxMTU = htonl(mtu);
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pkt.info.rwind = htonl(rxrpc_rx_window_size);
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pkt.info.jumbo_max = htonl(rxrpc_rx_jumbo_max);
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pkt.whdr.flags |= RXRPC_SLOW_START_OK;
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len += sizeof(pkt.ack) + sizeof(pkt.info);
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break;
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}
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/* Resync with __rxrpc_disconnect_call() and check that the last call
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* didn't get advanced whilst we were filling out the packets.
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*/
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smp_rmb();
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if (READ_ONCE(chan->last_call) != call_id)
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return;
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iov.iov_base = &pkt;
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iov.iov_len = len;
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serial = atomic_inc_return(&conn->serial);
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pkt.whdr.serial = htonl(serial);
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switch (chan->last_type) {
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case RXRPC_PACKET_TYPE_ABORT:
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_proto("Tx ABORT %%%u { %d } [re]", serial, conn->local_abort);
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break;
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case RXRPC_PACKET_TYPE_ACK:
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trace_rxrpc_tx_ack(NULL, serial, chan->last_seq, 0,
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RXRPC_ACK_DUPLICATE, 0);
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_proto("Tx ACK %%%u [re]", serial);
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break;
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}
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kernel_sendmsg(conn->params.local->socket, &msg, &iov, 1, len);
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_leave("");
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return;
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}
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/*
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* pass a connection-level abort onto all calls on that connection
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*/
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static void rxrpc_abort_calls(struct rxrpc_connection *conn,
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enum rxrpc_call_completion compl,
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u32 abort_code, int error)
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{
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struct rxrpc_call *call;
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int i;
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_enter("{%d},%x", conn->debug_id, abort_code);
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spin_lock(&conn->channel_lock);
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for (i = 0; i < RXRPC_MAXCALLS; i++) {
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call = rcu_dereference_protected(
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conn->channels[i].call,
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lockdep_is_held(&conn->channel_lock));
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if (call) {
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if (compl == RXRPC_CALL_LOCALLY_ABORTED)
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trace_rxrpc_abort("CON", call->cid,
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call->call_id, 0,
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abort_code, error);
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if (rxrpc_set_call_completion(call, compl,
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abort_code, error))
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rxrpc_notify_socket(call);
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}
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}
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spin_unlock(&conn->channel_lock);
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_leave("");
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}
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/*
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* generate a connection-level abort
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*/
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static int rxrpc_abort_connection(struct rxrpc_connection *conn,
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u32 error, u32 abort_code)
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{
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struct rxrpc_wire_header whdr;
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struct msghdr msg;
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struct kvec iov[2];
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__be32 word;
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size_t len;
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u32 serial;
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int ret;
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_enter("%d,,%u,%u", conn->debug_id, error, abort_code);
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/* generate a connection-level abort */
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spin_lock_bh(&conn->state_lock);
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if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
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spin_unlock_bh(&conn->state_lock);
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_leave(" = 0 [already dead]");
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return 0;
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}
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conn->state = RXRPC_CONN_LOCALLY_ABORTED;
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spin_unlock_bh(&conn->state_lock);
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rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code, error);
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msg.msg_name = &conn->params.peer->srx.transport;
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msg.msg_namelen = conn->params.peer->srx.transport_len;
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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(conn->proto.epoch);
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whdr.cid = htonl(conn->proto.cid);
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whdr.callNumber = 0;
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whdr.seq = 0;
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whdr.type = RXRPC_PACKET_TYPE_ABORT;
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whdr.flags = conn->out_clientflag;
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whdr.userStatus = 0;
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whdr.securityIndex = conn->security_ix;
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whdr._rsvd = 0;
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whdr.serviceId = htons(conn->params.service_id);
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word = htonl(conn->local_abort);
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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 = &word;
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iov[1].iov_len = sizeof(word);
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len = iov[0].iov_len + iov[1].iov_len;
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serial = atomic_inc_return(&conn->serial);
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whdr.serial = htonl(serial);
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_proto("Tx CONN ABORT %%%u { %d }", serial, conn->local_abort);
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ret = kernel_sendmsg(conn->params.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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return -EAGAIN;
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}
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_leave(" = 0");
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return 0;
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}
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/*
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* mark a call as being on a now-secured channel
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* - must be called with BH's disabled.
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*/
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static void rxrpc_call_is_secure(struct rxrpc_call *call)
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{
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_enter("%p", call);
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if (call) {
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write_lock_bh(&call->state_lock);
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if (call->state == RXRPC_CALL_SERVER_SECURING) {
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call->state = RXRPC_CALL_SERVER_ACCEPTING;
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rxrpc_notify_socket(call);
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}
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write_unlock_bh(&call->state_lock);
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}
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}
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/*
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* connection-level Rx packet processor
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*/
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static int rxrpc_process_event(struct rxrpc_connection *conn,
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struct sk_buff *skb,
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u32 *_abort_code)
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{
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struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
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__be32 wtmp;
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u32 abort_code;
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int loop, ret;
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if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
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_leave(" = -ECONNABORTED [%u]", conn->state);
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return -ECONNABORTED;
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}
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_enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial);
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switch (sp->hdr.type) {
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case RXRPC_PACKET_TYPE_DATA:
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case RXRPC_PACKET_TYPE_ACK:
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rxrpc_conn_retransmit_call(conn, skb);
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return 0;
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case RXRPC_PACKET_TYPE_BUSY:
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/* Just ignore BUSY packets for now. */
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return 0;
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case RXRPC_PACKET_TYPE_ABORT:
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if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
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&wtmp, sizeof(wtmp)) < 0)
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return -EPROTO;
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abort_code = ntohl(wtmp);
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_proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code);
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conn->state = RXRPC_CONN_REMOTELY_ABORTED;
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rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED,
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abort_code, ECONNABORTED);
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return -ECONNABORTED;
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case RXRPC_PACKET_TYPE_CHALLENGE:
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return conn->security->respond_to_challenge(conn, skb,
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_abort_code);
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case RXRPC_PACKET_TYPE_RESPONSE:
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ret = conn->security->verify_response(conn, skb, _abort_code);
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if (ret < 0)
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return ret;
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ret = conn->security->init_connection_security(conn);
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if (ret < 0)
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return ret;
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ret = conn->security->prime_packet_security(conn);
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if (ret < 0)
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return ret;
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spin_lock(&conn->channel_lock);
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spin_lock(&conn->state_lock);
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if (conn->state == RXRPC_CONN_SERVICE_CHALLENGING) {
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conn->state = RXRPC_CONN_SERVICE;
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spin_unlock(&conn->state_lock);
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for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
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rxrpc_call_is_secure(
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rcu_dereference_protected(
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conn->channels[loop].call,
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lockdep_is_held(&conn->channel_lock)));
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} else {
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spin_unlock(&conn->state_lock);
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}
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spin_unlock(&conn->channel_lock);
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return 0;
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default:
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_leave(" = -EPROTO [%u]", sp->hdr.type);
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return -EPROTO;
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}
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}
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/*
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* set up security and issue a challenge
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*/
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static void rxrpc_secure_connection(struct rxrpc_connection *conn)
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{
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u32 abort_code;
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int ret;
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_enter("{%d}", conn->debug_id);
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ASSERT(conn->security_ix != 0);
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if (!conn->params.key) {
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_debug("set up security");
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ret = rxrpc_init_server_conn_security(conn);
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switch (ret) {
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case 0:
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break;
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case -ENOENT:
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abort_code = RX_CALL_DEAD;
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goto abort;
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default:
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abort_code = RXKADNOAUTH;
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goto abort;
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}
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}
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if (conn->security->issue_challenge(conn) < 0) {
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abort_code = RX_CALL_DEAD;
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ret = -ENOMEM;
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goto abort;
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}
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_leave("");
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return;
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abort:
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_debug("abort %d, %d", ret, abort_code);
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rxrpc_abort_connection(conn, -ret, abort_code);
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_leave(" [aborted]");
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}
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/*
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* connection-level event processor
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*/
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void rxrpc_process_connection(struct work_struct *work)
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{
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struct rxrpc_connection *conn =
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container_of(work, struct rxrpc_connection, processor);
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struct sk_buff *skb;
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u32 abort_code = RX_PROTOCOL_ERROR;
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int ret;
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rxrpc_see_connection(conn);
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if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
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rxrpc_secure_connection(conn);
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/* go through the conn-level event packets, releasing the ref on this
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* connection that each one has when we've finished with it */
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while ((skb = skb_dequeue(&conn->rx_queue))) {
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rxrpc_see_skb(skb, rxrpc_skb_rx_seen);
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ret = rxrpc_process_event(conn, skb, &abort_code);
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switch (ret) {
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case -EPROTO:
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case -EKEYEXPIRED:
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case -EKEYREJECTED:
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goto protocol_error;
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case -EAGAIN:
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goto requeue_and_leave;
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case -ECONNABORTED:
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default:
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rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
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break;
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}
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}
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out:
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rxrpc_put_connection(conn);
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_leave("");
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return;
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requeue_and_leave:
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skb_queue_head(&conn->rx_queue, skb);
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goto out;
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protocol_error:
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if (rxrpc_abort_connection(conn, -ret, abort_code) < 0)
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goto requeue_and_leave;
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rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
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_leave(" [EPROTO]");
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goto out;
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}
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