![David Howells](/assets/img/avatar_default.png)
When retransmitting the final ACK or ABORT packet for a call, the cid field in the packet header is set to the connection's cid, but this is incorrect as it also needs to include the channel number on that connection that the call was made on. Fix this by OR'ing in the channel number. Note that this fixes the bug that: commit1a025028d4
rxrpc: Fix handling of call quietly cancelled out on server works around. I'm not intending to revert that as it will help protect against problems that might occur on the server. Fixes:3136ef49a1
("rxrpc: Delay terminal ACK transmission on a client call") Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
497 lines
12 KiB
C
497 lines
12 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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unsigned int channel)
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{
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struct rxrpc_skb_priv *sp = skb ? rxrpc_skb(skb) : NULL;
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struct rxrpc_channel *chan;
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struct msghdr msg;
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struct kvec iov[3];
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struct {
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struct rxrpc_wire_header whdr;
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union {
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__be32 abort_code;
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struct rxrpc_ackpacket ack;
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};
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} __attribute__((packed)) pkt;
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struct rxrpc_ackinfo ack_info;
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size_t len;
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int ret, ioc;
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u32 serial, mtu, call_id, padding;
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_enter("%d", conn->debug_id);
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chan = &conn->channels[channel];
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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 (skb && 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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iov[0].iov_base = &pkt;
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iov[0].iov_len = sizeof(pkt.whdr);
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iov[1].iov_base = &padding;
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iov[1].iov_len = 3;
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iov[2].iov_base = &ack_info;
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iov[2].iov_len = sizeof(ack_info);
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pkt.whdr.epoch = htonl(conn->proto.epoch);
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pkt.whdr.cid = htonl(conn->proto.cid | channel);
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pkt.whdr.callNumber = htonl(call_id);
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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(conn->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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iov[0].iov_len += sizeof(pkt.abort_code);
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len += sizeof(pkt.abort_code);
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ioc = 1;
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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 ? skb->priority : 0);
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pkt.ack.firstPacket = htonl(chan->last_seq + 1);
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pkt.ack.previousPacket = htonl(chan->last_seq);
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pkt.ack.serial = htonl(skb ? sp->hdr.serial : 0);
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pkt.ack.reason = skb ? RXRPC_ACK_DUPLICATE : RXRPC_ACK_IDLE;
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pkt.ack.nAcks = 0;
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ack_info.rxMTU = htonl(rxrpc_rx_mtu);
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ack_info.maxMTU = htonl(mtu);
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ack_info.rwind = htonl(rxrpc_rx_window_size);
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ack_info.jumbo_max = htonl(rxrpc_rx_jumbo_max);
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pkt.whdr.flags |= RXRPC_SLOW_START_OK;
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padding = 0;
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iov[0].iov_len += sizeof(pkt.ack);
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len += sizeof(pkt.ack) + 3 + sizeof(ack_info);
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ioc = 3;
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break;
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default:
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return;
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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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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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ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, ioc, len);
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conn->params.peer->last_tx_at = ktime_get_real();
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if (ret < 0)
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trace_rxrpc_tx_fail(conn->debug_id, serial, ret,
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rxrpc_tx_fail_call_final_resend);
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_leave("");
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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(call->debug_id,
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"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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int 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->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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trace_rxrpc_tx_fail(conn->debug_id, serial, ret,
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rxrpc_tx_fail_conn_abort);
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_debug("sendmsg failed: %d", ret);
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return -EAGAIN;
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}
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conn->params.peer->last_tx_at = ktime_get_real();
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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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sp->hdr.cid & RXRPC_CHANNELMASK);
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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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trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
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tracepoint_string("bad_abort"));
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return -EPROTO;
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}
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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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trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
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tracepoint_string("bad_conn_pkt"));
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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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* Process delayed final ACKs that we haven't subsumed into a subsequent call.
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*/
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static void rxrpc_process_delayed_final_acks(struct rxrpc_connection *conn)
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{
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unsigned long j = jiffies, next_j;
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unsigned int channel;
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bool set;
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again:
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next_j = j + LONG_MAX;
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set = false;
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for (channel = 0; channel < RXRPC_MAXCALLS; channel++) {
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struct rxrpc_channel *chan = &conn->channels[channel];
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unsigned long ack_at;
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if (!test_bit(RXRPC_CONN_FINAL_ACK_0 + channel, &conn->flags))
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continue;
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smp_rmb(); /* vs rxrpc_disconnect_client_call */
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ack_at = READ_ONCE(chan->final_ack_at);
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if (time_before(j, ack_at)) {
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if (time_before(ack_at, next_j)) {
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next_j = ack_at;
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set = true;
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}
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continue;
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}
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if (test_and_clear_bit(RXRPC_CONN_FINAL_ACK_0 + channel,
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&conn->flags))
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rxrpc_conn_retransmit_call(conn, NULL, channel);
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}
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j = jiffies;
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if (time_before_eq(next_j, j))
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goto again;
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if (set)
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rxrpc_reduce_conn_timer(conn, next_j);
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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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/* Process delayed ACKs whose time has come. */
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if (conn->flags & RXRPC_CONN_FINAL_ACK_MASK)
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rxrpc_process_delayed_final_acks(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 -ENOMEM:
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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)
|
|
goto requeue_and_leave;
|
|
rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
|
|
goto out;
|
|
}
|