mirror of
https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-09-08 09:08:05 -04:00
Fixed MTP to work with TWRP
This commit is contained in:
awab228
commit
f6dfaef42e
50820 changed files with 20846062 additions and 0 deletions
767
net/rxrpc/ar-input.c
Normal file
767
net/rxrpc/ar-input.c
Normal file
|
|
@ -0,0 +1,767 @@
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/* 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 <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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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 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 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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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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_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);
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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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||||
* 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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||||
{
|
||||
write_lock_bh(&call->state_lock);
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||||
|
||||
switch (call->state) {
|
||||
case RXRPC_CALL_CLIENT_AWAIT_REPLY:
|
||||
call->state = RXRPC_CALL_CLIENT_RECV_REPLY;
|
||||
call->acks_latest = serial;
|
||||
|
||||
_debug("implicit ACKALL %%%u", call->acks_latest);
|
||||
set_bit(RXRPC_CALL_RCVD_ACKALL, &call->events);
|
||||
write_unlock_bh(&call->state_lock);
|
||||
|
||||
if (try_to_del_timer_sync(&call->resend_timer) >= 0) {
|
||||
clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events);
|
||||
clear_bit(RXRPC_CALL_RESEND, &call->events);
|
||||
clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
|
||||
}
|
||||
break;
|
||||
|
||||
default:
|
||||
write_unlock_bh(&call->state_lock);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* post an incoming packet to the nominated call to deal with
|
||||
* - must get rid of the sk_buff, either by freeing it or by queuing it
|
||||
*/
|
||||
void rxrpc_fast_process_packet(struct rxrpc_call *call, struct sk_buff *skb)
|
||||
{
|
||||
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
|
||||
__be32 _abort_code;
|
||||
u32 serial, hi_serial, seq, abort_code;
|
||||
|
||||
_enter("%p,%p", call, skb);
|
||||
|
||||
ASSERT(!irqs_disabled());
|
||||
|
||||
#if 0 // INJECT RX ERROR
|
||||
if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA) {
|
||||
static int skip = 0;
|
||||
if (++skip == 3) {
|
||||
printk("DROPPED 3RD PACKET!!!!!!!!!!!!!\n");
|
||||
skip = 0;
|
||||
goto free_packet;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
/* track the latest serial number on this connection for ACK packet
|
||||
* information */
|
||||
serial = ntohl(sp->hdr.serial);
|
||||
hi_serial = atomic_read(&call->conn->hi_serial);
|
||||
while (serial > hi_serial)
|
||||
hi_serial = atomic_cmpxchg(&call->conn->hi_serial, hi_serial,
|
||||
serial);
|
||||
|
||||
/* request ACK generation for any ACK or DATA packet that requests
|
||||
* it */
|
||||
if (sp->hdr.flags & RXRPC_REQUEST_ACK) {
|
||||
_proto("ACK Requested on %%%u", serial);
|
||||
rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, sp->hdr.serial, false);
|
||||
}
|
||||
|
||||
switch (sp->hdr.type) {
|
||||
case RXRPC_PACKET_TYPE_ABORT:
|
||||
_debug("abort");
|
||||
|
||||
if (skb_copy_bits(skb, 0, &_abort_code,
|
||||
sizeof(_abort_code)) < 0)
|
||||
goto protocol_error;
|
||||
|
||||
abort_code = ntohl(_abort_code);
|
||||
_proto("Rx ABORT %%%u { %x }", serial, abort_code);
|
||||
|
||||
write_lock_bh(&call->state_lock);
|
||||
if (call->state < RXRPC_CALL_COMPLETE) {
|
||||
call->state = RXRPC_CALL_REMOTELY_ABORTED;
|
||||
call->abort_code = abort_code;
|
||||
set_bit(RXRPC_CALL_RCVD_ABORT, &call->events);
|
||||
rxrpc_queue_call(call);
|
||||
}
|
||||
goto free_packet_unlock;
|
||||
|
||||
case RXRPC_PACKET_TYPE_BUSY:
|
||||
_proto("Rx BUSY %%%u", serial);
|
||||
|
||||
if (call->conn->out_clientflag)
|
||||
goto protocol_error;
|
||||
|
||||
write_lock_bh(&call->state_lock);
|
||||
switch (call->state) {
|
||||
case RXRPC_CALL_CLIENT_SEND_REQUEST:
|
||||
call->state = RXRPC_CALL_SERVER_BUSY;
|
||||
set_bit(RXRPC_CALL_RCVD_BUSY, &call->events);
|
||||
rxrpc_queue_call(call);
|
||||
case RXRPC_CALL_SERVER_BUSY:
|
||||
goto free_packet_unlock;
|
||||
default:
|
||||
goto protocol_error_locked;
|
||||
}
|
||||
|
||||
default:
|
||||
_proto("Rx %s %%%u", rxrpc_pkts[sp->hdr.type], serial);
|
||||
goto protocol_error;
|
||||
|
||||
case RXRPC_PACKET_TYPE_DATA:
|
||||
seq = ntohl(sp->hdr.seq);
|
||||
|
||||
_proto("Rx DATA %%%u { #%u }", serial, seq);
|
||||
|
||||
if (seq == 0)
|
||||
goto protocol_error;
|
||||
|
||||
call->ackr_prev_seq = sp->hdr.seq;
|
||||
|
||||
/* received data implicitly ACKs all of the request packets we
|
||||
* sent when we're acting as a client */
|
||||
if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY)
|
||||
rxrpc_assume_implicit_ackall(call, serial);
|
||||
|
||||
switch (rxrpc_fast_process_data(call, skb, seq)) {
|
||||
case 0:
|
||||
skb = NULL;
|
||||
goto done;
|
||||
|
||||
default:
|
||||
BUG();
|
||||
|
||||
/* data packet received beyond the last packet */
|
||||
case -EBADMSG:
|
||||
goto protocol_error;
|
||||
}
|
||||
|
||||
case RXRPC_PACKET_TYPE_ACKALL:
|
||||
case RXRPC_PACKET_TYPE_ACK:
|
||||
/* ACK processing is done in process context */
|
||||
read_lock_bh(&call->state_lock);
|
||||
if (call->state < RXRPC_CALL_DEAD) {
|
||||
skb_queue_tail(&call->rx_queue, skb);
|
||||
rxrpc_queue_call(call);
|
||||
skb = NULL;
|
||||
}
|
||||
read_unlock_bh(&call->state_lock);
|
||||
goto free_packet;
|
||||
}
|
||||
|
||||
protocol_error:
|
||||
_debug("protocol error");
|
||||
write_lock_bh(&call->state_lock);
|
||||
protocol_error_locked:
|
||||
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);
|
||||
}
|
||||
free_packet_unlock:
|
||||
write_unlock_bh(&call->state_lock);
|
||||
free_packet:
|
||||
rxrpc_free_skb(skb);
|
||||
done:
|
||||
_leave("");
|
||||
}
|
||||
|
||||
/*
|
||||
* split up a jumbo data packet
|
||||
*/
|
||||
static void rxrpc_process_jumbo_packet(struct rxrpc_call *call,
|
||||
struct sk_buff *jumbo)
|
||||
{
|
||||
struct rxrpc_jumbo_header jhdr;
|
||||
struct rxrpc_skb_priv *sp;
|
||||
struct sk_buff *part;
|
||||
|
||||
_enter(",{%u,%u}", jumbo->data_len, jumbo->len);
|
||||
|
||||
sp = rxrpc_skb(jumbo);
|
||||
|
||||
do {
|
||||
sp->hdr.flags &= ~RXRPC_JUMBO_PACKET;
|
||||
|
||||
/* make a clone to represent the first subpacket in what's left
|
||||
* of the jumbo packet */
|
||||
part = skb_clone(jumbo, GFP_ATOMIC);
|
||||
if (!part) {
|
||||
/* simply ditch the tail in the event of ENOMEM */
|
||||
pskb_trim(jumbo, RXRPC_JUMBO_DATALEN);
|
||||
break;
|
||||
}
|
||||
rxrpc_new_skb(part);
|
||||
|
||||
pskb_trim(part, RXRPC_JUMBO_DATALEN);
|
||||
|
||||
if (!pskb_pull(jumbo, RXRPC_JUMBO_DATALEN))
|
||||
goto protocol_error;
|
||||
|
||||
if (skb_copy_bits(jumbo, 0, &jhdr, sizeof(jhdr)) < 0)
|
||||
goto protocol_error;
|
||||
if (!pskb_pull(jumbo, sizeof(jhdr)))
|
||||
BUG();
|
||||
|
||||
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_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_LOCALLY_ABORTED:
|
||||
if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events)) {
|
||||
rxrpc_queue_call(call);
|
||||
goto free_unlock;
|
||||
}
|
||||
case RXRPC_CALL_REMOTELY_ABORTED:
|
||||
case RXRPC_CALL_NETWORK_ERROR:
|
||||
case RXRPC_CALL_DEAD:
|
||||
goto dead_call;
|
||||
case RXRPC_CALL_COMPLETE:
|
||||
case RXRPC_CALL_CLIENT_FINAL_ACK:
|
||||
/* complete server call */
|
||||
if (call->conn->in_clientflag)
|
||||
goto dead_call;
|
||||
/* resend last packet of a completed call */
|
||||
_debug("final ack again");
|
||||
rxrpc_get_call(call);
|
||||
set_bit(RXRPC_CALL_ACK_FINAL, &call->events);
|
||||
rxrpc_queue_call(call);
|
||||
goto free_unlock;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
read_unlock(&call->state_lock);
|
||||
rxrpc_get_call(call);
|
||||
|
||||
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;
|
||||
|
||||
dead_call:
|
||||
if (sp->hdr.type != RXRPC_PACKET_TYPE_ABORT) {
|
||||
skb->priority = RX_CALL_DEAD;
|
||||
rxrpc_reject_packet(call->conn->trans->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 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);
|
||||
}
|
||||
|
||||
static struct rxrpc_connection *rxrpc_conn_from_local(struct rxrpc_local *local,
|
||||
struct sk_buff *skb,
|
||||
struct rxrpc_skb_priv *sp)
|
||||
{
|
||||
struct rxrpc_peer *peer;
|
||||
struct rxrpc_transport *trans;
|
||||
struct rxrpc_connection *conn;
|
||||
|
||||
peer = rxrpc_find_peer(local, ip_hdr(skb)->saddr,
|
||||
udp_hdr(skb)->source);
|
||||
if (IS_ERR(peer))
|
||||
goto cant_find_conn;
|
||||
|
||||
trans = rxrpc_find_transport(local, peer);
|
||||
rxrpc_put_peer(peer);
|
||||
if (!trans)
|
||||
goto cant_find_conn;
|
||||
|
||||
conn = rxrpc_find_connection(trans, &sp->hdr);
|
||||
rxrpc_put_transport(trans);
|
||||
if (!conn)
|
||||
goto cant_find_conn;
|
||||
|
||||
return conn;
|
||||
cant_find_conn:
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* handle data received on the local endpoint
|
||||
* - may be called in interrupt context
|
||||
*/
|
||||
void rxrpc_data_ready(struct sock *sk)
|
||||
{
|
||||
struct rxrpc_skb_priv *sp;
|
||||
struct rxrpc_local *local;
|
||||
struct sk_buff *skb;
|
||||
int ret;
|
||||
|
||||
_enter("%p", sk);
|
||||
|
||||
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);
|
||||
UDP_INC_STATS_BH(&init_net, UDP_MIB_INERRORS, 0);
|
||||
_leave(" [CSUM failed]");
|
||||
return;
|
||||
}
|
||||
|
||||
UDP_INC_STATS_BH(&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 */
|
||||
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;
|
||||
|
||||
if (sp->hdr.callNumber == 0) {
|
||||
/* This is a connection-level packet. These should be
|
||||
* fairly rare, so the extra overhead of looking them up the
|
||||
* old-fashioned way doesn't really hurt */
|
||||
struct rxrpc_connection *conn;
|
||||
|
||||
conn = rxrpc_conn_from_local(local, skb, sp);
|
||||
if (!conn)
|
||||
goto cant_route_call;
|
||||
|
||||
_debug("CONN %p {%d}", conn, conn->debug_id);
|
||||
rxrpc_post_packet_to_conn(conn, skb);
|
||||
rxrpc_put_connection(conn);
|
||||
} else {
|
||||
struct rxrpc_call *call;
|
||||
u8 in_clientflag = 0;
|
||||
|
||||
if (sp->hdr.flags & RXRPC_CLIENT_INITIATED)
|
||||
in_clientflag = RXRPC_CLIENT_INITIATED;
|
||||
call = rxrpc_find_call_hash(in_clientflag, sp->hdr.cid,
|
||||
sp->hdr.callNumber, sp->hdr.epoch,
|
||||
sp->hdr.serviceId, local, AF_INET,
|
||||
(u8 *)&ip_hdr(skb)->saddr);
|
||||
if (call)
|
||||
rxrpc_post_packet_to_call(call, skb);
|
||||
else
|
||||
goto cant_route_call;
|
||||
}
|
||||
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 == 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;
|
||||
}
|
||||
|
||||
if (sp->hdr.type != RXRPC_PACKET_TYPE_ABORT) {
|
||||
_debug("reject type %d",sp->hdr.type);
|
||||
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]");
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue