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![David Howells](/assets/img/avatar_default.png)
If CONFIG_AF_RXRPC_DEBUG_RX_DELAY=y, then a delay is injected between packets and errors being received and them being made available to the processing code, thereby allowing the RTT to be artificially increased. Signed-off-by: David Howells <dhowells@redhat.com> cc: Marc Dionne <marc.dionne@auristor.com> cc: linux-afs@lists.infradead.org
560 lines
15 KiB
C
560 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* RxRPC packet reception
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*
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* Copyright (C) 2007, 2016, 2022 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 "ar-internal.h"
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static int rxrpc_input_packet_on_conn(struct rxrpc_connection *conn,
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struct sockaddr_rxrpc *peer_srx,
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struct sk_buff *skb);
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/*
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* handle data received on the local endpoint
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* - may be called in interrupt context
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*
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* [!] Note that as this is called from the encap_rcv hook, the socket is not
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* held locked by the caller and nothing prevents sk_user_data on the UDP from
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* being cleared in the middle of processing this function.
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*
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* Called with the RCU read lock held from the IP layer via UDP.
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*/
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int rxrpc_encap_rcv(struct sock *udp_sk, struct sk_buff *skb)
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{
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struct sk_buff_head *rx_queue;
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struct rxrpc_local *local = rcu_dereference_sk_user_data(udp_sk);
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if (unlikely(!local)) {
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kfree_skb(skb);
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return 0;
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}
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if (skb->tstamp == 0)
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skb->tstamp = ktime_get_real();
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skb->mark = RXRPC_SKB_MARK_PACKET;
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rxrpc_new_skb(skb, rxrpc_skb_new_encap_rcv);
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rx_queue = &local->rx_queue;
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#ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
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if (rxrpc_inject_rx_delay ||
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!skb_queue_empty(&local->rx_delay_queue)) {
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skb->tstamp = ktime_add_ms(skb->tstamp, rxrpc_inject_rx_delay);
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rx_queue = &local->rx_delay_queue;
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}
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#endif
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skb_queue_tail(rx_queue, skb);
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rxrpc_wake_up_io_thread(local);
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return 0;
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}
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/*
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* Handle an error received on the local endpoint.
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*/
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void rxrpc_error_report(struct sock *sk)
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{
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struct rxrpc_local *local;
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struct sk_buff *skb;
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rcu_read_lock();
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local = rcu_dereference_sk_user_data(sk);
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if (unlikely(!local)) {
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rcu_read_unlock();
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return;
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}
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while ((skb = skb_dequeue(&sk->sk_error_queue))) {
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skb->mark = RXRPC_SKB_MARK_ERROR;
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rxrpc_new_skb(skb, rxrpc_skb_new_error_report);
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skb_queue_tail(&local->rx_queue, skb);
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}
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rxrpc_wake_up_io_thread(local);
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rcu_read_unlock();
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}
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/*
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* Directly produce an abort from a packet.
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*/
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bool rxrpc_direct_abort(struct sk_buff *skb, enum rxrpc_abort_reason why,
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s32 abort_code, int err)
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{
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struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
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trace_rxrpc_abort(0, why, sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
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abort_code, err);
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skb->mark = RXRPC_SKB_MARK_REJECT_ABORT;
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skb->priority = abort_code;
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return false;
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}
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static bool rxrpc_bad_message(struct sk_buff *skb, enum rxrpc_abort_reason why)
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{
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return rxrpc_direct_abort(skb, why, RX_PROTOCOL_ERROR, -EBADMSG);
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}
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#define just_discard true
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/*
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* Process event packets targeted at a local endpoint.
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*/
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static bool rxrpc_input_version(struct rxrpc_local *local, struct sk_buff *skb)
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{
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struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
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char v;
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_enter("");
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rxrpc_see_skb(skb, rxrpc_skb_see_version);
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if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header), &v, 1) >= 0) {
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if (v == 0)
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rxrpc_send_version_request(local, &sp->hdr, skb);
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}
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return true;
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}
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/*
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* Extract the wire header from a packet and translate the byte order.
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*/
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static bool rxrpc_extract_header(struct rxrpc_skb_priv *sp,
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struct sk_buff *skb)
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{
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struct rxrpc_wire_header whdr;
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/* dig out the RxRPC connection details */
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if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0)
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return rxrpc_bad_message(skb, rxrpc_badmsg_short_hdr);
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memset(sp, 0, sizeof(*sp));
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sp->hdr.epoch = ntohl(whdr.epoch);
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sp->hdr.cid = ntohl(whdr.cid);
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sp->hdr.callNumber = ntohl(whdr.callNumber);
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sp->hdr.seq = ntohl(whdr.seq);
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sp->hdr.serial = ntohl(whdr.serial);
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sp->hdr.flags = whdr.flags;
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sp->hdr.type = whdr.type;
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sp->hdr.userStatus = whdr.userStatus;
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sp->hdr.securityIndex = whdr.securityIndex;
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sp->hdr._rsvd = ntohs(whdr._rsvd);
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sp->hdr.serviceId = ntohs(whdr.serviceId);
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return true;
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}
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/*
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* Extract the abort code from an ABORT packet and stash it in skb->priority.
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*/
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static bool rxrpc_extract_abort(struct sk_buff *skb)
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{
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__be32 wtmp;
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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 false;
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skb->priority = ntohl(wtmp);
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return true;
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}
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/*
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* Process packets received on the local endpoint
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*/
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static bool rxrpc_input_packet(struct rxrpc_local *local, struct sk_buff **_skb)
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{
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struct rxrpc_connection *conn;
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struct sockaddr_rxrpc peer_srx;
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struct rxrpc_skb_priv *sp;
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struct rxrpc_peer *peer = NULL;
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struct sk_buff *skb = *_skb;
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bool ret = false;
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skb_pull(skb, sizeof(struct udphdr));
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sp = rxrpc_skb(skb);
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/* dig out the RxRPC connection details */
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if (!rxrpc_extract_header(sp, skb))
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return just_discard;
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if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) {
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static int lose;
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if ((lose++ & 7) == 7) {
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trace_rxrpc_rx_lose(sp);
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return just_discard;
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}
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}
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trace_rxrpc_rx_packet(sp);
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switch (sp->hdr.type) {
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case RXRPC_PACKET_TYPE_VERSION:
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if (rxrpc_to_client(sp))
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return just_discard;
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return rxrpc_input_version(local, skb);
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case RXRPC_PACKET_TYPE_BUSY:
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if (rxrpc_to_server(sp))
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return just_discard;
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fallthrough;
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case RXRPC_PACKET_TYPE_ACK:
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case RXRPC_PACKET_TYPE_ACKALL:
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if (sp->hdr.callNumber == 0)
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return rxrpc_bad_message(skb, rxrpc_badmsg_zero_call);
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break;
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case RXRPC_PACKET_TYPE_ABORT:
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if (!rxrpc_extract_abort(skb))
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return just_discard; /* Just discard if malformed */
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break;
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case RXRPC_PACKET_TYPE_DATA:
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if (sp->hdr.callNumber == 0)
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return rxrpc_bad_message(skb, rxrpc_badmsg_zero_call);
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if (sp->hdr.seq == 0)
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return rxrpc_bad_message(skb, rxrpc_badmsg_zero_seq);
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/* Unshare the packet so that it can be modified for in-place
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* decryption.
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*/
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if (sp->hdr.securityIndex != 0) {
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skb = skb_unshare(skb, GFP_ATOMIC);
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if (!skb) {
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rxrpc_eaten_skb(*_skb, rxrpc_skb_eaten_by_unshare_nomem);
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*_skb = NULL;
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return just_discard;
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}
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if (skb != *_skb) {
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rxrpc_eaten_skb(*_skb, rxrpc_skb_eaten_by_unshare);
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*_skb = skb;
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rxrpc_new_skb(skb, rxrpc_skb_new_unshared);
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sp = rxrpc_skb(skb);
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}
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}
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break;
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case RXRPC_PACKET_TYPE_CHALLENGE:
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if (rxrpc_to_server(sp))
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return just_discard;
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break;
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case RXRPC_PACKET_TYPE_RESPONSE:
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if (rxrpc_to_client(sp))
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return just_discard;
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break;
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/* Packet types 9-11 should just be ignored. */
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case RXRPC_PACKET_TYPE_PARAMS:
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case RXRPC_PACKET_TYPE_10:
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case RXRPC_PACKET_TYPE_11:
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return just_discard;
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default:
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return rxrpc_bad_message(skb, rxrpc_badmsg_unsupported_packet);
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}
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if (sp->hdr.serviceId == 0)
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return rxrpc_bad_message(skb, rxrpc_badmsg_zero_service);
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if (WARN_ON_ONCE(rxrpc_extract_addr_from_skb(&peer_srx, skb) < 0))
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return just_discard; /* Unsupported address type. */
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if (peer_srx.transport.family != local->srx.transport.family &&
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(peer_srx.transport.family == AF_INET &&
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local->srx.transport.family != AF_INET6)) {
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pr_warn_ratelimited("AF_RXRPC: Protocol mismatch %u not %u\n",
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peer_srx.transport.family,
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local->srx.transport.family);
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return just_discard; /* Wrong address type. */
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}
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if (rxrpc_to_client(sp)) {
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rcu_read_lock();
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conn = rxrpc_find_client_connection_rcu(local, &peer_srx, skb);
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conn = rxrpc_get_connection_maybe(conn, rxrpc_conn_get_call_input);
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rcu_read_unlock();
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if (!conn)
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return rxrpc_protocol_error(skb, rxrpc_eproto_no_client_conn);
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ret = rxrpc_input_packet_on_conn(conn, &peer_srx, skb);
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rxrpc_put_connection(conn, rxrpc_conn_put_call_input);
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return ret;
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}
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/* We need to look up service connections by the full protocol
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* parameter set. We look up the peer first as an intermediate step
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* and then the connection from the peer's tree.
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*/
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rcu_read_lock();
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peer = rxrpc_lookup_peer_rcu(local, &peer_srx);
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if (!peer) {
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rcu_read_unlock();
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return rxrpc_new_incoming_call(local, NULL, NULL, &peer_srx, skb);
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}
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conn = rxrpc_find_service_conn_rcu(peer, skb);
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conn = rxrpc_get_connection_maybe(conn, rxrpc_conn_get_call_input);
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if (conn) {
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rcu_read_unlock();
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ret = rxrpc_input_packet_on_conn(conn, &peer_srx, skb);
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rxrpc_put_connection(conn, rxrpc_conn_put_call_input);
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return ret;
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}
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peer = rxrpc_get_peer_maybe(peer, rxrpc_peer_get_input);
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rcu_read_unlock();
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ret = rxrpc_new_incoming_call(local, peer, NULL, &peer_srx, skb);
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rxrpc_put_peer(peer, rxrpc_peer_put_input);
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return ret;
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}
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/*
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* Deal with a packet that's associated with an extant connection.
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*/
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static int rxrpc_input_packet_on_conn(struct rxrpc_connection *conn,
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struct sockaddr_rxrpc *peer_srx,
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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 rxrpc_call *call = NULL;
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unsigned int channel;
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bool ret;
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if (sp->hdr.securityIndex != conn->security_ix)
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return rxrpc_direct_abort(skb, rxrpc_eproto_wrong_security,
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RXKADINCONSISTENCY, -EBADMSG);
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if (sp->hdr.serviceId != conn->service_id) {
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int old_id;
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if (!test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags))
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return rxrpc_protocol_error(skb, rxrpc_eproto_reupgrade);
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old_id = cmpxchg(&conn->service_id, conn->orig_service_id,
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sp->hdr.serviceId);
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if (old_id != conn->orig_service_id &&
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old_id != sp->hdr.serviceId)
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return rxrpc_protocol_error(skb, rxrpc_eproto_bad_upgrade);
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}
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if (after(sp->hdr.serial, conn->hi_serial))
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conn->hi_serial = sp->hdr.serial;
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/* It's a connection-level packet if the call number is 0. */
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if (sp->hdr.callNumber == 0)
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return rxrpc_input_conn_packet(conn, skb);
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/* Call-bound packets are routed by connection channel. */
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channel = sp->hdr.cid & RXRPC_CHANNELMASK;
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chan = &conn->channels[channel];
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/* Ignore really old calls */
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if (sp->hdr.callNumber < chan->last_call)
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return just_discard;
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if (sp->hdr.callNumber == chan->last_call) {
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if (chan->call ||
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sp->hdr.type == RXRPC_PACKET_TYPE_ABORT)
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return just_discard;
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/* For the previous service call, if completed successfully, we
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* discard all further packets.
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*/
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if (rxrpc_conn_is_service(conn) &&
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chan->last_type == RXRPC_PACKET_TYPE_ACK)
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return just_discard;
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/* But otherwise we need to retransmit the final packet from
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* data cached in the connection record.
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*/
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if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA)
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trace_rxrpc_rx_data(chan->call_debug_id,
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sp->hdr.seq,
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sp->hdr.serial,
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sp->hdr.flags);
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rxrpc_conn_retransmit_call(conn, skb, channel);
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return just_discard;
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}
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call = rxrpc_try_get_call(chan->call, rxrpc_call_get_input);
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if (sp->hdr.callNumber > chan->call_id) {
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if (rxrpc_to_client(sp)) {
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rxrpc_put_call(call, rxrpc_call_put_input);
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return rxrpc_protocol_error(skb,
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rxrpc_eproto_unexpected_implicit_end);
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}
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if (call) {
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rxrpc_implicit_end_call(call, skb);
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rxrpc_put_call(call, rxrpc_call_put_input);
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call = NULL;
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}
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}
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if (!call) {
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if (rxrpc_to_client(sp))
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return rxrpc_protocol_error(skb, rxrpc_eproto_no_client_call);
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return rxrpc_new_incoming_call(conn->local, conn->peer, conn,
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peer_srx, skb);
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}
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ret = rxrpc_input_call_event(call, skb);
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rxrpc_put_call(call, rxrpc_call_put_input);
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return ret;
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}
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/*
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* I/O and event handling thread.
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*/
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int rxrpc_io_thread(void *data)
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{
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struct rxrpc_connection *conn;
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struct sk_buff_head rx_queue;
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struct rxrpc_local *local = data;
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struct rxrpc_call *call;
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struct sk_buff *skb;
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#ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
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ktime_t now;
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#endif
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bool should_stop;
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complete(&local->io_thread_ready);
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skb_queue_head_init(&rx_queue);
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set_user_nice(current, MIN_NICE);
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for (;;) {
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rxrpc_inc_stat(local->rxnet, stat_io_loop);
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/* Deal with connections that want immediate attention. */
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conn = list_first_entry_or_null(&local->conn_attend_q,
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struct rxrpc_connection,
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attend_link);
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if (conn) {
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spin_lock_bh(&local->lock);
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list_del_init(&conn->attend_link);
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spin_unlock_bh(&local->lock);
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rxrpc_input_conn_event(conn, NULL);
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rxrpc_put_connection(conn, rxrpc_conn_put_poke);
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continue;
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}
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if (test_and_clear_bit(RXRPC_CLIENT_CONN_REAP_TIMER,
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&local->client_conn_flags))
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rxrpc_discard_expired_client_conns(local);
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/* Deal with calls that want immediate attention. */
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if ((call = list_first_entry_or_null(&local->call_attend_q,
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struct rxrpc_call,
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attend_link))) {
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spin_lock_bh(&local->lock);
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list_del_init(&call->attend_link);
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spin_unlock_bh(&local->lock);
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trace_rxrpc_call_poked(call);
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rxrpc_input_call_event(call, NULL);
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rxrpc_put_call(call, rxrpc_call_put_poke);
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continue;
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}
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if (!list_empty(&local->new_client_calls))
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rxrpc_connect_client_calls(local);
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/* Process received packets and errors. */
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if ((skb = __skb_dequeue(&rx_queue))) {
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struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
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switch (skb->mark) {
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case RXRPC_SKB_MARK_PACKET:
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skb->priority = 0;
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if (!rxrpc_input_packet(local, &skb))
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rxrpc_reject_packet(local, skb);
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trace_rxrpc_rx_done(skb->mark, skb->priority);
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rxrpc_free_skb(skb, rxrpc_skb_put_input);
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break;
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case RXRPC_SKB_MARK_ERROR:
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rxrpc_input_error(local, skb);
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rxrpc_free_skb(skb, rxrpc_skb_put_error_report);
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break;
|
|
case RXRPC_SKB_MARK_SERVICE_CONN_SECURED:
|
|
rxrpc_input_conn_event(sp->conn, skb);
|
|
rxrpc_put_connection(sp->conn, rxrpc_conn_put_poke);
|
|
rxrpc_free_skb(skb, rxrpc_skb_put_conn_secured);
|
|
break;
|
|
default:
|
|
WARN_ON_ONCE(1);
|
|
rxrpc_free_skb(skb, rxrpc_skb_put_unknown);
|
|
break;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
/* Inject a delay into packets if requested. */
|
|
#ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
|
|
now = ktime_get_real();
|
|
while ((skb = skb_peek(&local->rx_delay_queue))) {
|
|
if (ktime_before(now, skb->tstamp))
|
|
break;
|
|
skb = skb_dequeue(&local->rx_delay_queue);
|
|
skb_queue_tail(&local->rx_queue, skb);
|
|
}
|
|
#endif
|
|
|
|
if (!skb_queue_empty(&local->rx_queue)) {
|
|
spin_lock_irq(&local->rx_queue.lock);
|
|
skb_queue_splice_tail_init(&local->rx_queue, &rx_queue);
|
|
spin_unlock_irq(&local->rx_queue.lock);
|
|
continue;
|
|
}
|
|
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
should_stop = kthread_should_stop();
|
|
if (!skb_queue_empty(&local->rx_queue) ||
|
|
!list_empty(&local->call_attend_q) ||
|
|
!list_empty(&local->conn_attend_q) ||
|
|
!list_empty(&local->new_client_calls) ||
|
|
test_bit(RXRPC_CLIENT_CONN_REAP_TIMER,
|
|
&local->client_conn_flags)) {
|
|
__set_current_state(TASK_RUNNING);
|
|
continue;
|
|
}
|
|
|
|
if (should_stop)
|
|
break;
|
|
|
|
#ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
|
|
skb = skb_peek(&local->rx_delay_queue);
|
|
if (skb) {
|
|
unsigned long timeout;
|
|
ktime_t tstamp = skb->tstamp;
|
|
ktime_t now = ktime_get_real();
|
|
s64 delay_ns = ktime_to_ns(ktime_sub(tstamp, now));
|
|
|
|
if (delay_ns <= 0) {
|
|
__set_current_state(TASK_RUNNING);
|
|
continue;
|
|
}
|
|
|
|
timeout = nsecs_to_jiffies(delay_ns);
|
|
timeout = max(timeout, 1UL);
|
|
schedule_timeout(timeout);
|
|
__set_current_state(TASK_RUNNING);
|
|
continue;
|
|
}
|
|
#endif
|
|
|
|
schedule();
|
|
}
|
|
|
|
__set_current_state(TASK_RUNNING);
|
|
rxrpc_see_local(local, rxrpc_local_stop);
|
|
rxrpc_destroy_local(local);
|
|
local->io_thread = NULL;
|
|
rxrpc_see_local(local, rxrpc_local_stopped);
|
|
return 0;
|
|
}
|