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![David Howells](/assets/img/avatar_default.png)
Log ack.rwind in the rxrpc_tx_ack tracepoint. This value is useful to see as it represents flow-control information to the peer. Signed-off-by: David Howells <dhowells@redhat.com> cc: Marc Dionne <marc.dionne@auristor.com> cc: linux-afs@lists.infradead.org
435 lines
11 KiB
C
435 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* 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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#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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* Set the completion state on an aborted connection.
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*/
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static bool rxrpc_set_conn_aborted(struct rxrpc_connection *conn, struct sk_buff *skb,
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s32 abort_code, int err,
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enum rxrpc_call_completion compl)
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{
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bool aborted = false;
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if (conn->state != RXRPC_CONN_ABORTED) {
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spin_lock(&conn->state_lock);
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if (conn->state != RXRPC_CONN_ABORTED) {
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conn->abort_code = abort_code;
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conn->error = err;
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conn->completion = compl;
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/* Order the abort info before the state change. */
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smp_store_release(&conn->state, RXRPC_CONN_ABORTED);
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set_bit(RXRPC_CONN_DONT_REUSE, &conn->flags);
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set_bit(RXRPC_CONN_EV_ABORT_CALLS, &conn->events);
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aborted = true;
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}
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spin_unlock(&conn->state_lock);
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}
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return aborted;
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}
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/*
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* Mark a socket buffer to indicate that the connection it's on should be aborted.
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*/
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int rxrpc_abort_conn(struct rxrpc_connection *conn, struct sk_buff *skb,
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s32 abort_code, int err, enum rxrpc_abort_reason why)
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{
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struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
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if (rxrpc_set_conn_aborted(conn, skb, abort_code, err,
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RXRPC_CALL_LOCALLY_ABORTED)) {
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trace_rxrpc_abort(0, why, sp->hdr.cid, sp->hdr.callNumber,
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sp->hdr.seq, abort_code, err);
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rxrpc_poke_conn(conn, rxrpc_conn_get_poke_abort);
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}
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return -EPROTO;
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}
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/*
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* Mark a connection as being remotely aborted.
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*/
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static bool rxrpc_input_conn_abort(struct rxrpc_connection *conn,
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struct sk_buff *skb)
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{
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return rxrpc_set_conn_aborted(conn, skb, skb->priority, -ECONNABORTED,
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RXRPC_CALL_REMOTELY_ABORTED);
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}
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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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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 = chan->last_call;
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if (skb && call_id != sp->hdr.callNumber)
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return;
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msg.msg_name = &conn->peer->srx.transport;
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msg.msg_namelen = conn->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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serial = atomic_inc_return(&conn->serial);
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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.serial = htonl(serial);
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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->peer->if_mtu;
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mtu -= conn->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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trace_rxrpc_tx_ack(chan->call_debug_id, serial,
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ntohl(pkt.ack.firstPacket),
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ntohl(pkt.ack.serial),
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pkt.ack.reason, 0, rxrpc_rx_window_size);
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break;
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default:
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return;
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}
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ret = kernel_sendmsg(conn->local->socket, &msg, iov, ioc, len);
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conn->peer->last_tx_at = ktime_get_seconds();
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if (ret < 0)
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trace_rxrpc_tx_fail(chan->call_debug_id, serial, ret,
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rxrpc_tx_point_call_final_resend);
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else
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trace_rxrpc_tx_packet(chan->call_debug_id, &pkt.whdr,
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rxrpc_tx_point_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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{
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struct rxrpc_call *call;
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int i;
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_enter("{%d},%x", conn->debug_id, conn->abort_code);
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for (i = 0; i < RXRPC_MAXCALLS; i++) {
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call = conn->channels[i].call;
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if (call)
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rxrpc_set_call_completion(call,
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conn->completion,
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conn->abort_code,
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conn->error);
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}
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_leave("");
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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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if (call && __rxrpc_call_state(call) == RXRPC_CALL_SERVER_SECURING) {
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rxrpc_set_call_state(call, RXRPC_CALL_SERVER_RECV_REQUEST);
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rxrpc_notify_socket(call);
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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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{
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struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
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int ret;
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if (conn->state == RXRPC_CONN_ABORTED)
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return -ECONNABORTED;
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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_CHALLENGE:
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return conn->security->respond_to_challenge(conn, skb);
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case RXRPC_PACKET_TYPE_RESPONSE:
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ret = conn->security->verify_response(conn, skb);
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if (ret < 0)
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return ret;
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ret = conn->security->init_connection_security(
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conn, conn->key->payload.data[0]);
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if (ret < 0)
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return ret;
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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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if (conn->state == RXRPC_CONN_SERVICE) {
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/* Offload call state flipping to the I/O thread. As
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* we've already received the packet, put it on the
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* front of the queue.
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*/
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skb->mark = RXRPC_SKB_MARK_SERVICE_CONN_SECURED;
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rxrpc_get_skb(skb, rxrpc_skb_get_conn_secured);
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skb_queue_head(&conn->local->rx_queue, skb);
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rxrpc_wake_up_io_thread(conn->local);
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}
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return 0;
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default:
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WARN_ON_ONCE(1);
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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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if (conn->security->issue_challenge(conn) < 0)
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rxrpc_abort_conn(conn, NULL, RX_CALL_DEAD, -ENOMEM,
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rxrpc_abort_nomem);
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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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void rxrpc_process_delayed_final_acks(struct rxrpc_connection *conn, bool force)
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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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ack_at = chan->final_ack_at;
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if (time_before(j, ack_at) && !force) {
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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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static void rxrpc_do_process_connection(struct rxrpc_connection *conn)
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{
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struct sk_buff *skb;
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int ret;
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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_see_conn_work);
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ret = rxrpc_process_event(conn, skb);
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switch (ret) {
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case -ENOMEM:
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case -EAGAIN:
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skb_queue_head(&conn->rx_queue, skb);
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rxrpc_queue_conn(conn, rxrpc_conn_queue_retry_work);
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break;
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default:
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rxrpc_free_skb(skb, rxrpc_skb_put_conn_work);
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break;
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}
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}
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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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rxrpc_see_connection(conn, rxrpc_conn_see_work);
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if (__rxrpc_use_local(conn->local, rxrpc_local_use_conn_work)) {
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rxrpc_do_process_connection(conn);
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rxrpc_unuse_local(conn->local, rxrpc_local_unuse_conn_work);
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}
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}
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/*
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* post connection-level events to the connection
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* - this includes challenges, responses, some aborts and call terminal packet
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* retransmission.
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*/
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static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn,
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struct sk_buff *skb)
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{
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_enter("%p,%p", conn, skb);
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rxrpc_get_skb(skb, rxrpc_skb_get_conn_work);
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skb_queue_tail(&conn->rx_queue, skb);
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rxrpc_queue_conn(conn, rxrpc_conn_queue_rx_work);
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}
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/*
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* Input a connection-level packet.
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*/
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bool rxrpc_input_conn_packet(struct rxrpc_connection *conn, struct sk_buff *skb)
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{
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struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
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switch (sp->hdr.type) {
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case RXRPC_PACKET_TYPE_BUSY:
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/* Just ignore BUSY packets for now. */
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return true;
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case RXRPC_PACKET_TYPE_ABORT:
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if (rxrpc_is_conn_aborted(conn))
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return true;
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rxrpc_input_conn_abort(conn, skb);
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rxrpc_abort_calls(conn);
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return true;
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case RXRPC_PACKET_TYPE_CHALLENGE:
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case RXRPC_PACKET_TYPE_RESPONSE:
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if (rxrpc_is_conn_aborted(conn)) {
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if (conn->completion == RXRPC_CALL_LOCALLY_ABORTED)
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rxrpc_send_conn_abort(conn);
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return true;
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}
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rxrpc_post_packet_to_conn(conn, skb);
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return true;
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default:
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WARN_ON_ONCE(1);
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return true;
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}
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}
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/*
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* Input a connection event.
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*/
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void rxrpc_input_conn_event(struct rxrpc_connection *conn, struct sk_buff *skb)
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{
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unsigned int loop;
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if (test_and_clear_bit(RXRPC_CONN_EV_ABORT_CALLS, &conn->events))
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rxrpc_abort_calls(conn);
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switch (skb->mark) {
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case RXRPC_SKB_MARK_SERVICE_CONN_SECURED:
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if (conn->state != RXRPC_CONN_SERVICE)
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break;
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for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
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rxrpc_call_is_secure(conn->channels[loop].call);
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break;
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}
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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, false);
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}
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