![David S. Miller](/assets/img/avatar_default.png)
CC [M] net/rxrpc/ar-input.o net/rxrpc/ar-input.c: In function ‘rxrpc_fast_process_data’: net/rxrpc/ar-input.c:171: warning: passing argument 2 of ‘__test_and_set_bit’ from incompatible pointer type net/rxrpc/ar-input.c:180: warning: passing argument 2 of ‘__clear_bit’ from incompatible pointer type net/rxrpc/ar-input.c:218: warning: passing argument 2 of ‘__clear_bit’ from incompatible pointer type Signed-off-by: David S. Miller <davem@davemloft.net>
798 lines
20 KiB
C
798 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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#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 <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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unsigned long rxrpc_ack_timeout = 1;
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const char *rxrpc_pkts[] = {
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"?00",
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"DATA", "ACK", "BUSY", "ABORT", "ACKALL", "CHALL", "RESP", "DEBUG",
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"?09", "?10", "?11", "?12", "?13", "?14", "?15"
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};
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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 = call->socket;
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struct sock *sk;
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int skb_len, 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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skb->destructor = NULL;
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sp->call = NULL;
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rxrpc_put_call(call);
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rxrpc_free_skb(skb);
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return 0;
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}
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sk = &rx->sk;
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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) 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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call->socket->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 (rx->interceptor) {
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rx->interceptor(sk, call->user_call_ID, skb);
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spin_unlock_bh(&sk->sk_receive_queue.lock);
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} else {
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/* Cache the SKB length before we tack it onto the
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* receive queue. Once it is added it no longer
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* belongs to us and may be freed by other threads of
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* control pulling packets from the queue */
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skb_len = skb->len;
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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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if (!sock_flag(sk, SOCK_DEAD))
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sk->sk_data_ready(sk, skb_len);
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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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/* release the socket buffer */
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if (skb) {
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skb->destructor = NULL;
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sp->call = NULL;
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rxrpc_put_call(call);
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rxrpc_free_skb(skb);
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}
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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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_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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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->conn->security)
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goto enqueue_packet;
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sp->call = call;
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rxrpc_get_call(call);
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terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) &&
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!(sp->hdr.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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_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 (sp->hdr.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_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, sp->hdr.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, sp->hdr.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, sp->hdr.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_DEAD)
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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_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_RESEND_TIMER, &call->events);
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clear_bit(RXRPC_CALL_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 _abort_code;
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u32 serial, hi_serial, seq, 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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/* track the latest serial number on this connection for ACK packet
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* information */
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serial = ntohl(sp->hdr.serial);
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hi_serial = atomic_read(&call->conn->hi_serial);
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while (serial > hi_serial)
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hi_serial = atomic_cmpxchg(&call->conn->hi_serial, hi_serial,
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serial);
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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", serial);
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rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, sp->hdr.serial,
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!(sp->hdr.flags & RXRPC_MORE_PACKETS));
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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, &_abort_code,
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sizeof(_abort_code)) < 0)
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goto protocol_error;
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abort_code = ntohl(_abort_code);
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_proto("Rx ABORT %%%u { %x }", serial, abort_code);
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write_lock_bh(&call->state_lock);
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if (call->state < RXRPC_CALL_COMPLETE) {
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call->state = RXRPC_CALL_REMOTELY_ABORTED;
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call->abort_code = abort_code;
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set_bit(RXRPC_CALL_RCVD_ABORT, &call->events);
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rxrpc_queue_call(call);
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}
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goto free_packet_unlock;
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case RXRPC_PACKET_TYPE_BUSY:
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_proto("Rx BUSY %%%u", serial);
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if (call->conn->out_clientflag)
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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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call->state = RXRPC_CALL_SERVER_BUSY;
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set_bit(RXRPC_CALL_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], serial);
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goto protocol_error;
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case RXRPC_PACKET_TYPE_DATA:
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seq = ntohl(sp->hdr.seq);
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_proto("Rx DATA %%%u { #%u }", serial, seq);
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if (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, serial);
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switch (rxrpc_fast_process_data(call, skb, 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_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_DEAD) {
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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 (call->state <= RXRPC_CALL_COMPLETE) {
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call->state = RXRPC_CALL_LOCALLY_ABORTED;
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call->abort_code = RX_PROTOCOL_ERROR;
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set_bit(RXRPC_CALL_ABORT, &call->events);
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rxrpc_queue_call(call);
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}
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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 = htonl(ntohl(sp->hdr.seq) + 1);
|
|
sp->hdr.serial = htonl(ntohl(sp->hdr.serial) + 1);
|
|
sp->hdr.flags = jhdr.flags;
|
|
sp->hdr._rsvd = jhdr._rsvd;
|
|
|
|
_proto("Rx DATA Jumbo %%%u", ntohl(sp->hdr.serial) - 1);
|
|
|
|
rxrpc_fast_process_packet(call, part);
|
|
part = NULL;
|
|
|
|
} while (sp->hdr.flags & RXRPC_JUMBO_PACKET);
|
|
|
|
rxrpc_fast_process_packet(call, jumbo);
|
|
_leave("");
|
|
return;
|
|
|
|
protocol_error:
|
|
_debug("protocol error");
|
|
rxrpc_free_skb(part);
|
|
rxrpc_free_skb(jumbo);
|
|
write_lock_bh(&call->state_lock);
|
|
if (call->state <= RXRPC_CALL_COMPLETE) {
|
|
call->state = RXRPC_CALL_LOCALLY_ABORTED;
|
|
call->abort_code = RX_PROTOCOL_ERROR;
|
|
set_bit(RXRPC_CALL_ABORT, &call->events);
|
|
rxrpc_queue_call(call);
|
|
}
|
|
write_unlock_bh(&call->state_lock);
|
|
_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 sk_buff *skb)
|
|
{
|
|
struct rxrpc_skb_priv *sp;
|
|
struct rxrpc_call *call;
|
|
struct rb_node *p;
|
|
__be32 call_id;
|
|
|
|
_enter("%p,%p", conn, skb);
|
|
|
|
read_lock_bh(&conn->lock);
|
|
|
|
sp = rxrpc_skb(skb);
|
|
|
|
/* look at extant calls by channel number first */
|
|
call = conn->channels[ntohl(sp->hdr.cid) & RXRPC_CHANNELMASK];
|
|
if (!call || call->call_id != sp->hdr.callNumber)
|
|
goto call_not_extant;
|
|
|
|
_debug("extant call [%d]", call->state);
|
|
ASSERTCMP(call->conn, ==, conn);
|
|
|
|
read_lock(&call->state_lock);
|
|
switch (call->state) {
|
|
case RXRPC_CALL_LOCALLY_ABORTED:
|
|
if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events))
|
|
rxrpc_queue_call(call);
|
|
case RXRPC_CALL_REMOTELY_ABORTED:
|
|
case RXRPC_CALL_NETWORK_ERROR:
|
|
case RXRPC_CALL_DEAD:
|
|
goto free_unlock;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
read_unlock(&call->state_lock);
|
|
rxrpc_get_call(call);
|
|
read_unlock_bh(&conn->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);
|
|
|
|
rxrpc_put_call(call);
|
|
goto done;
|
|
|
|
call_not_extant:
|
|
/* search the completed calls in case what we're dealing with is
|
|
* there */
|
|
_debug("call not extant");
|
|
|
|
call_id = sp->hdr.callNumber;
|
|
p = conn->calls.rb_node;
|
|
while (p) {
|
|
call = rb_entry(p, struct rxrpc_call, conn_node);
|
|
|
|
if (call_id < call->call_id)
|
|
p = p->rb_left;
|
|
else if (call_id > call->call_id)
|
|
p = p->rb_right;
|
|
else
|
|
goto found_completed_call;
|
|
}
|
|
|
|
dead_call:
|
|
/* it's a either a really old call that we no longer remember or its a
|
|
* new incoming call */
|
|
read_unlock_bh(&conn->lock);
|
|
|
|
if (sp->hdr.flags & RXRPC_CLIENT_INITIATED &&
|
|
sp->hdr.seq == __constant_cpu_to_be32(1)) {
|
|
_debug("incoming call");
|
|
skb_queue_tail(&conn->trans->local->accept_queue, skb);
|
|
rxrpc_queue_work(&conn->trans->local->acceptor);
|
|
goto done;
|
|
}
|
|
|
|
_debug("dead call");
|
|
skb->priority = RX_CALL_DEAD;
|
|
rxrpc_reject_packet(conn->trans->local, skb);
|
|
goto done;
|
|
|
|
/* resend last packet of a completed call
|
|
* - client calls may have been aborted or ACK'd
|
|
* - server calls may have been aborted
|
|
*/
|
|
found_completed_call:
|
|
_debug("completed call");
|
|
|
|
if (atomic_read(&call->usage) == 0)
|
|
goto dead_call;
|
|
|
|
/* synchronise any state changes */
|
|
read_lock(&call->state_lock);
|
|
ASSERTIFCMP(call->state != RXRPC_CALL_CLIENT_FINAL_ACK,
|
|
call->state, >=, RXRPC_CALL_COMPLETE);
|
|
|
|
if (call->state == RXRPC_CALL_LOCALLY_ABORTED ||
|
|
call->state == RXRPC_CALL_REMOTELY_ABORTED ||
|
|
call->state == RXRPC_CALL_DEAD) {
|
|
read_unlock(&call->state_lock);
|
|
goto dead_call;
|
|
}
|
|
|
|
if (call->conn->in_clientflag) {
|
|
read_unlock(&call->state_lock);
|
|
goto dead_call; /* complete server call */
|
|
}
|
|
|
|
_debug("final ack again");
|
|
rxrpc_get_call(call);
|
|
set_bit(RXRPC_CALL_ACK_FINAL, &call->events);
|
|
rxrpc_queue_call(call);
|
|
|
|
free_unlock:
|
|
read_unlock(&call->state_lock);
|
|
read_unlock_bh(&conn->lock);
|
|
rxrpc_free_skb(skb);
|
|
done:
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* post connection-level events to the connection
|
|
* - this includes challenges, responses and some aborts
|
|
*/
|
|
static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn,
|
|
struct sk_buff *skb)
|
|
{
|
|
_enter("%p,%p", conn, skb);
|
|
|
|
atomic_inc(&conn->usage);
|
|
skb_queue_tail(&conn->rx_queue, skb);
|
|
rxrpc_queue_conn(conn);
|
|
}
|
|
|
|
/*
|
|
* handle data received on the local endpoint
|
|
* - may be called in interrupt context
|
|
*/
|
|
void rxrpc_data_ready(struct sock *sk, int count)
|
|
{
|
|
struct rxrpc_connection *conn;
|
|
struct rxrpc_transport *trans;
|
|
struct rxrpc_skb_priv *sp;
|
|
struct rxrpc_local *local;
|
|
struct rxrpc_peer *peer;
|
|
struct sk_buff *skb;
|
|
int ret;
|
|
|
|
_enter("%p, %d", sk, count);
|
|
|
|
ASSERT(!irqs_disabled());
|
|
|
|
read_lock_bh(&rxrpc_local_lock);
|
|
local = sk->sk_user_data;
|
|
if (local && atomic_read(&local->usage) > 0)
|
|
rxrpc_get_local(local);
|
|
else
|
|
local = NULL;
|
|
read_unlock_bh(&rxrpc_local_lock);
|
|
if (!local) {
|
|
_leave(" [local dead]");
|
|
return;
|
|
}
|
|
|
|
skb = skb_recv_datagram(sk, 0, 1, &ret);
|
|
if (!skb) {
|
|
rxrpc_put_local(local);
|
|
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);
|
|
rxrpc_put_local(local);
|
|
_leave(" [CSUM failed]");
|
|
return;
|
|
}
|
|
|
|
/* the socket buffer we have is owned by UDP, with UDP's data all over
|
|
* it, but we really want our own */
|
|
skb_orphan(skb);
|
|
sp = rxrpc_skb(skb);
|
|
memset(sp, 0, sizeof(*sp));
|
|
|
|
_net("Rx UDP packet from %08x:%04hu",
|
|
ntohl(ip_hdr(skb)->saddr), ntohs(udp_hdr(skb)->source));
|
|
|
|
/* dig out the RxRPC connection details */
|
|
if (skb_copy_bits(skb, sizeof(struct udphdr), &sp->hdr,
|
|
sizeof(sp->hdr)) < 0)
|
|
goto bad_message;
|
|
if (!pskb_pull(skb, sizeof(struct udphdr) + sizeof(sp->hdr)))
|
|
BUG();
|
|
|
|
_net("Rx RxRPC %s ep=%x call=%x:%x",
|
|
sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient",
|
|
ntohl(sp->hdr.epoch),
|
|
ntohl(sp->hdr.cid),
|
|
ntohl(sp->hdr.callNumber));
|
|
|
|
if (sp->hdr.type == 0 || sp->hdr.type >= RXRPC_N_PACKET_TYPES) {
|
|
_proto("Rx Bad Packet Type %u", sp->hdr.type);
|
|
goto bad_message;
|
|
}
|
|
|
|
if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
|
|
(sp->hdr.callNumber == 0 || sp->hdr.seq == 0))
|
|
goto bad_message;
|
|
|
|
peer = rxrpc_find_peer(local, ip_hdr(skb)->saddr, udp_hdr(skb)->source);
|
|
if (IS_ERR(peer))
|
|
goto cant_route_call;
|
|
|
|
trans = rxrpc_find_transport(local, peer);
|
|
rxrpc_put_peer(peer);
|
|
if (!trans)
|
|
goto cant_route_call;
|
|
|
|
conn = rxrpc_find_connection(trans, &sp->hdr);
|
|
rxrpc_put_transport(trans);
|
|
if (!conn)
|
|
goto cant_route_call;
|
|
|
|
_debug("CONN %p {%d}", conn, conn->debug_id);
|
|
|
|
if (sp->hdr.callNumber == 0)
|
|
rxrpc_post_packet_to_conn(conn, skb);
|
|
else
|
|
rxrpc_post_packet_to_call(conn, skb);
|
|
rxrpc_put_connection(conn);
|
|
rxrpc_put_local(local);
|
|
return;
|
|
|
|
cant_route_call:
|
|
_debug("can't route call");
|
|
if (sp->hdr.flags & RXRPC_CLIENT_INITIATED &&
|
|
sp->hdr.type == RXRPC_PACKET_TYPE_DATA) {
|
|
if (sp->hdr.seq == __constant_cpu_to_be32(1)) {
|
|
_debug("first packet");
|
|
skb_queue_tail(&local->accept_queue, skb);
|
|
rxrpc_queue_work(&local->acceptor);
|
|
rxrpc_put_local(local);
|
|
_leave(" [incoming]");
|
|
return;
|
|
}
|
|
skb->priority = RX_INVALID_OPERATION;
|
|
} else {
|
|
skb->priority = RX_CALL_DEAD;
|
|
}
|
|
|
|
_debug("reject");
|
|
rxrpc_reject_packet(local, skb);
|
|
rxrpc_put_local(local);
|
|
_leave(" [no call]");
|
|
return;
|
|
|
|
bad_message:
|
|
skb->priority = RX_PROTOCOL_ERROR;
|
|
rxrpc_reject_packet(local, skb);
|
|
rxrpc_put_local(local);
|
|
_leave(" [badmsg]");
|
|
}
|