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49e19ec7d3
Add two tracepoints: (1) Record the RxRPC protocol header of packets retrieved from the UDP socket by the data_ready handler. (2) Record the outcome of the data_ready handler. Signed-off-by: David Howells <dhowells@redhat.com>
808 lines
20 KiB
C
808 lines
20 KiB
C
/* RxRPC packet reception
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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 <linux/udp.h>
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#include <linux/in.h>
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#include <linux/in6.h>
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#include <linux/icmp.h>
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#include <linux/gfp.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 <net/udp.h>
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#include <net/net_namespace.h>
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#include "ar-internal.h"
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/*
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* queue a packet for recvmsg to pass to userspace
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* - the caller must hold a lock on call->lock
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* - must not be called with interrupts disabled (sk_filter() disables BH's)
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* - eats the packet whether successful or not
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* - there must be just one reference to the packet, which the caller passes to
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* this function
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*/
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int rxrpc_queue_rcv_skb(struct rxrpc_call *call, struct sk_buff *skb,
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bool force, bool terminal)
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{
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struct rxrpc_skb_priv *sp;
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struct rxrpc_sock *rx;
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struct sock *sk;
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int ret;
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_enter(",,%d,%d", force, terminal);
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ASSERT(!irqs_disabled());
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sp = rxrpc_skb(skb);
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ASSERTCMP(sp->call, ==, call);
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/* if we've already posted the terminal message for a call, then we
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* don't post any more */
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if (test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) {
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_debug("already terminated");
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ASSERTCMP(call->state, >=, RXRPC_CALL_COMPLETE);
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rxrpc_free_skb(skb);
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return 0;
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}
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/* The socket may go away under us */
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ret = 0;
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rcu_read_lock();
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rx = rcu_dereference(call->socket);
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if (!rx)
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goto out;
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sk = &rx->sk;
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if (sock_flag(sk, SOCK_DEAD))
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goto out;
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if (!force) {
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/* cast skb->rcvbuf to unsigned... It's pointless, but
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* reduces number of warnings when compiling with -W
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* --ANK */
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// ret = -ENOBUFS;
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// if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
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// (unsigned int) sk->sk_rcvbuf)
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// goto out;
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ret = sk_filter(sk, skb);
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if (ret < 0)
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goto out;
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}
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spin_lock_bh(&sk->sk_receive_queue.lock);
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if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags) &&
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!test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
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sk->sk_state != RXRPC_CLOSE) {
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skb->destructor = rxrpc_packet_destructor;
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skb->dev = NULL;
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skb->sk = sk;
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atomic_add(skb->truesize, &sk->sk_rmem_alloc);
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if (terminal) {
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_debug("<<<< TERMINAL MESSAGE >>>>");
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set_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags);
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}
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/* allow interception by a kernel service */
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if (skb->mark == RXRPC_SKB_MARK_NEW_CALL &&
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rx->notify_new_call) {
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spin_unlock_bh(&sk->sk_receive_queue.lock);
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skb_queue_tail(&call->knlrecv_queue, skb);
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rx->notify_new_call(&rx->sk);
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} else if (call->notify_rx) {
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spin_unlock_bh(&sk->sk_receive_queue.lock);
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skb_queue_tail(&call->knlrecv_queue, skb);
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call->notify_rx(&rx->sk, call, call->user_call_ID);
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} else {
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_net("post skb %p", skb);
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__skb_queue_tail(&sk->sk_receive_queue, skb);
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spin_unlock_bh(&sk->sk_receive_queue.lock);
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sk->sk_data_ready(sk);
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}
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skb = NULL;
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} else {
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spin_unlock_bh(&sk->sk_receive_queue.lock);
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}
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ret = 0;
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out:
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rxrpc_free_skb(skb);
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rcu_read_unlock();
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_leave(" = %d", ret);
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return ret;
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}
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/*
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* process a DATA packet, posting the packet to the appropriate queue
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* - eats the packet if successful
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*/
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static int rxrpc_fast_process_data(struct rxrpc_call *call,
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struct sk_buff *skb, u32 seq)
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{
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struct rxrpc_skb_priv *sp;
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bool terminal;
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int ret, ackbit, ack;
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u32 serial;
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u16 skew;
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u8 flags;
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_enter("{%u,%u},,{%u}", call->rx_data_post, call->rx_first_oos, seq);
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sp = rxrpc_skb(skb);
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ASSERTCMP(sp->call, ==, NULL);
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flags = sp->hdr.flags;
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serial = sp->hdr.serial;
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skew = skb->priority;
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spin_lock(&call->lock);
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if (call->state > RXRPC_CALL_COMPLETE)
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goto discard;
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ASSERTCMP(call->rx_data_expect, >=, call->rx_data_post);
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ASSERTCMP(call->rx_data_post, >=, call->rx_data_recv);
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ASSERTCMP(call->rx_data_recv, >=, call->rx_data_eaten);
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if (seq < call->rx_data_post) {
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_debug("dup #%u [-%u]", seq, call->rx_data_post);
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ack = RXRPC_ACK_DUPLICATE;
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ret = -ENOBUFS;
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goto discard_and_ack;
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}
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/* we may already have the packet in the out of sequence queue */
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ackbit = seq - (call->rx_data_eaten + 1);
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ASSERTCMP(ackbit, >=, 0);
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if (__test_and_set_bit(ackbit, call->ackr_window)) {
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_debug("dup oos #%u [%u,%u]",
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seq, call->rx_data_eaten, call->rx_data_post);
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ack = RXRPC_ACK_DUPLICATE;
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goto discard_and_ack;
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}
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if (seq >= call->ackr_win_top) {
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_debug("exceed #%u [%u]", seq, call->ackr_win_top);
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__clear_bit(ackbit, call->ackr_window);
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ack = RXRPC_ACK_EXCEEDS_WINDOW;
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goto discard_and_ack;
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}
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if (seq == call->rx_data_expect) {
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clear_bit(RXRPC_CALL_EXPECT_OOS, &call->flags);
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call->rx_data_expect++;
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} else if (seq > call->rx_data_expect) {
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_debug("oos #%u [%u]", seq, call->rx_data_expect);
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call->rx_data_expect = seq + 1;
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if (test_and_set_bit(RXRPC_CALL_EXPECT_OOS, &call->flags)) {
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ack = RXRPC_ACK_OUT_OF_SEQUENCE;
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goto enqueue_and_ack;
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}
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goto enqueue_packet;
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}
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if (seq != call->rx_data_post) {
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_debug("ahead #%u [%u]", seq, call->rx_data_post);
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goto enqueue_packet;
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}
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if (test_bit(RXRPC_CALL_RCVD_LAST, &call->flags))
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goto protocol_error;
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/* if the packet need security things doing to it, then it goes down
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* the slow path */
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if (call->security_ix)
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goto enqueue_packet;
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sp->call = call;
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rxrpc_get_call_for_skb(call, skb);
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terminal = ((flags & RXRPC_LAST_PACKET) &&
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!(flags & RXRPC_CLIENT_INITIATED));
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ret = rxrpc_queue_rcv_skb(call, skb, false, terminal);
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if (ret < 0) {
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if (ret == -ENOMEM || ret == -ENOBUFS) {
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__clear_bit(ackbit, call->ackr_window);
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ack = RXRPC_ACK_NOSPACE;
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goto discard_and_ack;
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}
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goto out;
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}
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skb = NULL;
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sp = NULL;
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_debug("post #%u", seq);
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ASSERTCMP(call->rx_data_post, ==, seq);
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call->rx_data_post++;
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if (flags & RXRPC_LAST_PACKET)
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set_bit(RXRPC_CALL_RCVD_LAST, &call->flags);
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/* if we've reached an out of sequence packet then we need to drain
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* that queue into the socket Rx queue now */
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if (call->rx_data_post == call->rx_first_oos) {
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_debug("drain rx oos now");
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read_lock(&call->state_lock);
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if (call->state < RXRPC_CALL_COMPLETE &&
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!test_and_set_bit(RXRPC_CALL_EV_DRAIN_RX_OOS, &call->events))
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rxrpc_queue_call(call);
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read_unlock(&call->state_lock);
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}
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spin_unlock(&call->lock);
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atomic_inc(&call->ackr_not_idle);
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rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, skew, serial, false);
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_leave(" = 0 [posted]");
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return 0;
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protocol_error:
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ret = -EBADMSG;
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out:
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spin_unlock(&call->lock);
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_leave(" = %d", ret);
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return ret;
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discard_and_ack:
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_debug("discard and ACK packet %p", skb);
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__rxrpc_propose_ACK(call, ack, skew, serial, true);
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discard:
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spin_unlock(&call->lock);
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rxrpc_free_skb(skb);
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_leave(" = 0 [discarded]");
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return 0;
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enqueue_and_ack:
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__rxrpc_propose_ACK(call, ack, skew, serial, true);
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enqueue_packet:
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_net("defer skb %p", skb);
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spin_unlock(&call->lock);
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skb_queue_tail(&call->rx_queue, skb);
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atomic_inc(&call->ackr_not_idle);
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read_lock(&call->state_lock);
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if (call->state < RXRPC_CALL_COMPLETE)
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rxrpc_queue_call(call);
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read_unlock(&call->state_lock);
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_leave(" = 0 [queued]");
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return 0;
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}
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/*
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* assume an implicit ACKALL of the transmission phase of a client socket upon
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* reception of the first reply packet
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*/
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static void rxrpc_assume_implicit_ackall(struct rxrpc_call *call, u32 serial)
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{
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write_lock_bh(&call->state_lock);
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switch (call->state) {
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case RXRPC_CALL_CLIENT_AWAIT_REPLY:
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call->state = RXRPC_CALL_CLIENT_RECV_REPLY;
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call->acks_latest = serial;
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_debug("implicit ACKALL %%%u", call->acks_latest);
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set_bit(RXRPC_CALL_EV_RCVD_ACKALL, &call->events);
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write_unlock_bh(&call->state_lock);
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if (try_to_del_timer_sync(&call->resend_timer) >= 0) {
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clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events);
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clear_bit(RXRPC_CALL_EV_RESEND, &call->events);
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clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
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}
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break;
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default:
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write_unlock_bh(&call->state_lock);
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break;
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}
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}
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/*
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* post an incoming packet to the nominated call to deal with
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* - must get rid of the sk_buff, either by freeing it or by queuing it
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*/
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void rxrpc_fast_process_packet(struct rxrpc_call *call, struct sk_buff *skb)
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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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_enter("%p,%p", call, skb);
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ASSERT(!irqs_disabled());
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#if 0 // INJECT RX ERROR
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if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA) {
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static int skip = 0;
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if (++skip == 3) {
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printk("DROPPED 3RD PACKET!!!!!!!!!!!!!\n");
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skip = 0;
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goto free_packet;
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}
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}
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#endif
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/* request ACK generation for any ACK or DATA packet that requests
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* it */
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if (sp->hdr.flags & RXRPC_REQUEST_ACK) {
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_proto("ACK Requested on %%%u", sp->hdr.serial);
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rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED,
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skb->priority, sp->hdr.serial, false);
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}
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switch (sp->hdr.type) {
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case RXRPC_PACKET_TYPE_ABORT:
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_debug("abort");
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if (skb_copy_bits(skb, 0, &wtmp, sizeof(wtmp)) < 0)
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goto protocol_error;
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abort_code = ntohl(wtmp);
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_proto("Rx ABORT %%%u { %x }", sp->hdr.serial, abort_code);
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if (__rxrpc_set_call_completion(call,
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RXRPC_CALL_REMOTELY_ABORTED,
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abort_code, ECONNABORTED)) {
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set_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events);
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rxrpc_queue_call(call);
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}
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goto free_packet;
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case RXRPC_PACKET_TYPE_BUSY:
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_proto("Rx BUSY %%%u", sp->hdr.serial);
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if (rxrpc_is_service_call(call))
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goto protocol_error;
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write_lock_bh(&call->state_lock);
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switch (call->state) {
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case RXRPC_CALL_CLIENT_SEND_REQUEST:
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__rxrpc_set_call_completion(call,
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RXRPC_CALL_SERVER_BUSY,
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0, EBUSY);
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set_bit(RXRPC_CALL_EV_RCVD_BUSY, &call->events);
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rxrpc_queue_call(call);
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case RXRPC_CALL_SERVER_BUSY:
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goto free_packet_unlock;
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default:
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goto protocol_error_locked;
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}
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default:
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_proto("Rx %s %%%u", rxrpc_pkts[sp->hdr.type], sp->hdr.serial);
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goto protocol_error;
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case RXRPC_PACKET_TYPE_DATA:
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_proto("Rx DATA %%%u { #%u }", sp->hdr.serial, sp->hdr.seq);
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if (sp->hdr.seq == 0)
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goto protocol_error;
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call->ackr_prev_seq = sp->hdr.seq;
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/* received data implicitly ACKs all of the request packets we
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* sent when we're acting as a client */
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if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY)
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rxrpc_assume_implicit_ackall(call, sp->hdr.serial);
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switch (rxrpc_fast_process_data(call, skb, sp->hdr.seq)) {
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case 0:
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skb = NULL;
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goto done;
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default:
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BUG();
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/* data packet received beyond the last packet */
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case -EBADMSG:
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goto protocol_error;
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}
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case RXRPC_PACKET_TYPE_ACKALL:
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case RXRPC_PACKET_TYPE_ACK:
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/* ACK processing is done in process context */
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read_lock_bh(&call->state_lock);
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if (call->state < RXRPC_CALL_COMPLETE) {
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skb_queue_tail(&call->rx_queue, skb);
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rxrpc_queue_call(call);
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skb = NULL;
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}
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read_unlock_bh(&call->state_lock);
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goto free_packet;
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}
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protocol_error:
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_debug("protocol error");
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write_lock_bh(&call->state_lock);
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protocol_error_locked:
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if (__rxrpc_abort_call("FPR", call, 0, RX_PROTOCOL_ERROR, EPROTO))
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rxrpc_queue_call(call);
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free_packet_unlock:
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write_unlock_bh(&call->state_lock);
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free_packet:
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rxrpc_free_skb(skb);
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done:
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_leave("");
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}
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/*
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* split up a jumbo data packet
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*/
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static void rxrpc_process_jumbo_packet(struct rxrpc_call *call,
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struct sk_buff *jumbo)
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{
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struct rxrpc_jumbo_header jhdr;
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struct rxrpc_skb_priv *sp;
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struct sk_buff *part;
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_enter(",{%u,%u}", jumbo->data_len, jumbo->len);
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sp = rxrpc_skb(jumbo);
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do {
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sp->hdr.flags &= ~RXRPC_JUMBO_PACKET;
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/* make a clone to represent the first subpacket in what's left
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* of the jumbo packet */
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part = skb_clone(jumbo, GFP_ATOMIC);
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if (!part) {
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/* simply ditch the tail in the event of ENOMEM */
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pskb_trim(jumbo, RXRPC_JUMBO_DATALEN);
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break;
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}
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rxrpc_new_skb(part);
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pskb_trim(part, RXRPC_JUMBO_DATALEN);
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if (!pskb_pull(jumbo, RXRPC_JUMBO_DATALEN))
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goto protocol_error;
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if (skb_copy_bits(jumbo, 0, &jhdr, sizeof(jhdr)) < 0)
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goto protocol_error;
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if (!pskb_pull(jumbo, sizeof(jhdr)))
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BUG();
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sp->hdr.seq += 1;
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sp->hdr.serial += 1;
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sp->hdr.flags = jhdr.flags;
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sp->hdr._rsvd = ntohs(jhdr._rsvd);
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_proto("Rx DATA Jumbo %%%u", sp->hdr.serial - 1);
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rxrpc_fast_process_packet(call, part);
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part = NULL;
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} while (sp->hdr.flags & RXRPC_JUMBO_PACKET);
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rxrpc_fast_process_packet(call, jumbo);
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_leave("");
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return;
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protocol_error:
|
|
_debug("protocol error");
|
|
rxrpc_free_skb(part);
|
|
if (rxrpc_abort_call("PJP", call, sp->hdr.seq,
|
|
RX_PROTOCOL_ERROR, EPROTO))
|
|
rxrpc_queue_call(call);
|
|
rxrpc_free_skb(jumbo);
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* post an incoming packet to the appropriate call/socket to deal with
|
|
* - must get rid of the sk_buff, either by freeing it or by queuing it
|
|
*/
|
|
static void rxrpc_post_packet_to_call(struct rxrpc_connection *conn,
|
|
struct rxrpc_call *call,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct rxrpc_skb_priv *sp;
|
|
|
|
_enter("%p,%p", call, skb);
|
|
|
|
sp = rxrpc_skb(skb);
|
|
|
|
_debug("extant call [%d]", call->state);
|
|
|
|
read_lock(&call->state_lock);
|
|
switch (call->state) {
|
|
case RXRPC_CALL_COMPLETE:
|
|
switch (call->completion) {
|
|
case RXRPC_CALL_LOCALLY_ABORTED:
|
|
if (!test_and_set_bit(RXRPC_CALL_EV_ABORT,
|
|
&call->events)) {
|
|
rxrpc_queue_call(call);
|
|
goto free_unlock;
|
|
}
|
|
default:
|
|
goto dead_call;
|
|
case RXRPC_CALL_SUCCEEDED:
|
|
if (rxrpc_is_service_call(call))
|
|
goto dead_call;
|
|
goto resend_final_ack;
|
|
}
|
|
|
|
case RXRPC_CALL_CLIENT_FINAL_ACK:
|
|
goto resend_final_ack;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
read_unlock(&call->state_lock);
|
|
|
|
if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
|
|
sp->hdr.flags & RXRPC_JUMBO_PACKET)
|
|
rxrpc_process_jumbo_packet(call, skb);
|
|
else
|
|
rxrpc_fast_process_packet(call, skb);
|
|
|
|
goto done;
|
|
|
|
resend_final_ack:
|
|
_debug("final ack again");
|
|
set_bit(RXRPC_CALL_EV_ACK_FINAL, &call->events);
|
|
rxrpc_queue_call(call);
|
|
goto free_unlock;
|
|
|
|
dead_call:
|
|
if (sp->hdr.type != RXRPC_PACKET_TYPE_ABORT) {
|
|
skb->priority = RX_CALL_DEAD;
|
|
rxrpc_reject_packet(conn->params.local, skb);
|
|
goto unlock;
|
|
}
|
|
free_unlock:
|
|
rxrpc_free_skb(skb);
|
|
unlock:
|
|
read_unlock(&call->state_lock);
|
|
done:
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* post connection-level events to the connection
|
|
* - this includes challenges, responses, some aborts and call terminal packet
|
|
* retransmission.
|
|
*/
|
|
static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn,
|
|
struct sk_buff *skb)
|
|
{
|
|
_enter("%p,%p", conn, skb);
|
|
|
|
skb_queue_tail(&conn->rx_queue, skb);
|
|
rxrpc_queue_conn(conn);
|
|
}
|
|
|
|
/*
|
|
* post endpoint-level events to the local endpoint
|
|
* - this includes debug and version messages
|
|
*/
|
|
static void rxrpc_post_packet_to_local(struct rxrpc_local *local,
|
|
struct sk_buff *skb)
|
|
{
|
|
_enter("%p,%p", local, skb);
|
|
|
|
skb_queue_tail(&local->event_queue, skb);
|
|
rxrpc_queue_local(local);
|
|
}
|
|
|
|
/*
|
|
* Extract the wire header from a packet and translate the byte order.
|
|
*/
|
|
static noinline
|
|
int rxrpc_extract_header(struct rxrpc_skb_priv *sp, struct sk_buff *skb)
|
|
{
|
|
struct rxrpc_wire_header whdr;
|
|
|
|
/* dig out the RxRPC connection details */
|
|
if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0)
|
|
return -EBADMSG;
|
|
if (!pskb_pull(skb, sizeof(whdr)))
|
|
BUG();
|
|
|
|
memset(sp, 0, sizeof(*sp));
|
|
sp->hdr.epoch = ntohl(whdr.epoch);
|
|
sp->hdr.cid = ntohl(whdr.cid);
|
|
sp->hdr.callNumber = ntohl(whdr.callNumber);
|
|
sp->hdr.seq = ntohl(whdr.seq);
|
|
sp->hdr.serial = ntohl(whdr.serial);
|
|
sp->hdr.flags = whdr.flags;
|
|
sp->hdr.type = whdr.type;
|
|
sp->hdr.userStatus = whdr.userStatus;
|
|
sp->hdr.securityIndex = whdr.securityIndex;
|
|
sp->hdr._rsvd = ntohs(whdr._rsvd);
|
|
sp->hdr.serviceId = ntohs(whdr.serviceId);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* handle data received on the local endpoint
|
|
* - may be called in interrupt context
|
|
*
|
|
* The socket is locked by the caller and this prevents the socket from being
|
|
* shut down and the local endpoint from going away, thus sk_user_data will not
|
|
* be cleared until this function returns.
|
|
*/
|
|
void rxrpc_data_ready(struct sock *sk)
|
|
{
|
|
struct rxrpc_connection *conn;
|
|
struct rxrpc_skb_priv *sp;
|
|
struct rxrpc_local *local = sk->sk_user_data;
|
|
struct sk_buff *skb;
|
|
int ret, skew;
|
|
|
|
_enter("%p", sk);
|
|
|
|
ASSERT(!irqs_disabled());
|
|
|
|
skb = skb_recv_datagram(sk, 0, 1, &ret);
|
|
if (!skb) {
|
|
if (ret == -EAGAIN)
|
|
return;
|
|
_debug("UDP socket error %d", ret);
|
|
return;
|
|
}
|
|
|
|
rxrpc_new_skb(skb);
|
|
|
|
_net("recv skb %p", skb);
|
|
|
|
/* we'll probably need to checksum it (didn't call sock_recvmsg) */
|
|
if (skb_checksum_complete(skb)) {
|
|
rxrpc_free_skb(skb);
|
|
__UDP_INC_STATS(&init_net, UDP_MIB_INERRORS, 0);
|
|
_leave(" [CSUM failed]");
|
|
return;
|
|
}
|
|
|
|
__UDP_INC_STATS(&init_net, UDP_MIB_INDATAGRAMS, 0);
|
|
|
|
/* The socket buffer we have is owned by UDP, with UDP's data all over
|
|
* it, but we really want our own data there.
|
|
*/
|
|
skb_orphan(skb);
|
|
sp = rxrpc_skb(skb);
|
|
|
|
_net("Rx UDP packet from %08x:%04hu",
|
|
ntohl(ip_hdr(skb)->saddr), ntohs(udp_hdr(skb)->source));
|
|
|
|
/* dig out the RxRPC connection details */
|
|
if (rxrpc_extract_header(sp, skb) < 0)
|
|
goto bad_message;
|
|
trace_rxrpc_rx_packet(sp);
|
|
|
|
_net("Rx RxRPC %s ep=%x call=%x:%x",
|
|
sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient",
|
|
sp->hdr.epoch, sp->hdr.cid, sp->hdr.callNumber);
|
|
|
|
if (sp->hdr.type >= RXRPC_N_PACKET_TYPES ||
|
|
!((RXRPC_SUPPORTED_PACKET_TYPES >> sp->hdr.type) & 1)) {
|
|
_proto("Rx Bad Packet Type %u", sp->hdr.type);
|
|
goto bad_message;
|
|
}
|
|
|
|
if (sp->hdr.type == RXRPC_PACKET_TYPE_VERSION) {
|
|
rxrpc_post_packet_to_local(local, skb);
|
|
goto out;
|
|
}
|
|
|
|
if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
|
|
(sp->hdr.callNumber == 0 || sp->hdr.seq == 0))
|
|
goto bad_message;
|
|
|
|
rcu_read_lock();
|
|
|
|
conn = rxrpc_find_connection_rcu(local, skb);
|
|
if (!conn) {
|
|
skb->priority = 0;
|
|
goto cant_route_call;
|
|
}
|
|
|
|
/* Note the serial number skew here */
|
|
skew = (int)sp->hdr.serial - (int)conn->hi_serial;
|
|
if (skew >= 0) {
|
|
if (skew > 0)
|
|
conn->hi_serial = sp->hdr.serial;
|
|
skb->priority = 0;
|
|
} else {
|
|
skew = -skew;
|
|
skb->priority = min(skew, 65535);
|
|
}
|
|
|
|
if (sp->hdr.callNumber == 0) {
|
|
/* Connection-level packet */
|
|
_debug("CONN %p {%d}", conn, conn->debug_id);
|
|
rxrpc_post_packet_to_conn(conn, skb);
|
|
goto out_unlock;
|
|
} else {
|
|
/* Call-bound packets are routed by connection channel. */
|
|
unsigned int channel = sp->hdr.cid & RXRPC_CHANNELMASK;
|
|
struct rxrpc_channel *chan = &conn->channels[channel];
|
|
struct rxrpc_call *call;
|
|
|
|
/* Ignore really old calls */
|
|
if (sp->hdr.callNumber < chan->last_call)
|
|
goto discard_unlock;
|
|
|
|
if (sp->hdr.callNumber == chan->last_call) {
|
|
/* For the previous service call, if completed
|
|
* successfully, we discard all further packets.
|
|
*/
|
|
if (rxrpc_conn_is_service(conn) &&
|
|
(chan->last_type == RXRPC_PACKET_TYPE_ACK ||
|
|
sp->hdr.type == RXRPC_PACKET_TYPE_ABORT))
|
|
goto discard_unlock;
|
|
|
|
/* But otherwise we need to retransmit the final packet
|
|
* from data cached in the connection record.
|
|
*/
|
|
rxrpc_post_packet_to_conn(conn, skb);
|
|
goto out_unlock;
|
|
}
|
|
|
|
call = rcu_dereference(chan->call);
|
|
if (!call || atomic_read(&call->usage) == 0)
|
|
goto cant_route_call;
|
|
|
|
rxrpc_see_call(call);
|
|
rxrpc_post_packet_to_call(conn, call, skb);
|
|
goto out_unlock;
|
|
}
|
|
|
|
discard_unlock:
|
|
rxrpc_free_skb(skb);
|
|
out_unlock:
|
|
rcu_read_unlock();
|
|
out:
|
|
trace_rxrpc_rx_done(0, 0);
|
|
return;
|
|
|
|
cant_route_call:
|
|
rcu_read_unlock();
|
|
|
|
_debug("can't route call");
|
|
if (sp->hdr.flags & RXRPC_CLIENT_INITIATED &&
|
|
sp->hdr.type == RXRPC_PACKET_TYPE_DATA) {
|
|
if (sp->hdr.seq == 1) {
|
|
_debug("first packet");
|
|
skb_queue_tail(&local->accept_queue, skb);
|
|
rxrpc_queue_work(&local->processor);
|
|
_leave(" [incoming]");
|
|
goto out;
|
|
}
|
|
skb->priority = RX_INVALID_OPERATION;
|
|
} else {
|
|
skb->priority = RX_CALL_DEAD;
|
|
}
|
|
|
|
if (sp->hdr.type != RXRPC_PACKET_TYPE_ABORT) {
|
|
_debug("reject type %d",sp->hdr.type);
|
|
goto reject_packet;
|
|
} else {
|
|
rxrpc_free_skb(skb);
|
|
}
|
|
_leave(" [no call]");
|
|
return;
|
|
|
|
bad_message:
|
|
skb->priority = RX_PROTOCOL_ERROR;
|
|
reject_packet:
|
|
trace_rxrpc_rx_done(skb->mark, skb->priority);
|
|
rxrpc_reject_packet(local, skb);
|
|
_leave(" [badmsg]");
|
|
}
|