6448f34585
network stack when reentering the inbound path from netgraph, and force queueing of mbufs at the outbound netgraph node. The mechanism relies on two components. First, in netgraph nodes where outbound path of the network stack calls into netgraph, the current thread has to be appropriately marked using the new NG_OUTBOUND_THREAD_REF() macro before proceeding to call further into the netgraph topology, and unmarked using the NG_OUTBOUND_THREAD_UNREF() macro before returning to the caller. Second, netgraph nodes which can potentially reenter the network stack in the inbound path have to mark their inbound hooks using NG_HOOK_SET_TO_INBOUND() macro. The netgraph framework will then detect when there is a danger of a call graph looping back from outbound to inbound path via netgraph, and defer handing off the mbufs to the "inbound" node to a worker thread with a clean stack. In this first pass only the most obvious netgraph nodes have been updated to ensure no outbound to inbound calls can occur. Nodes such as ng_ipfw, ng_gif etc. should be further examined whether a potential for outbound to inbound call looping exists. This commit changes the layout of struct thread, but due to __FreeBSD_version number shortage a version bump has been omitted at this time, nevertheless kernel and modules have to be rebuilt. Reviewed by: julian, rwatson, bz Approved by: julian (mentor)
141 lines
4.8 KiB
C
141 lines
4.8 KiB
C
/*
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* ng_ip_input.c
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*/
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/*-
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* Copyright 2001 The Aerospace Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions, and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of The Aerospace Corporation may not be used to endorse or
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* promote products derived from this software.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AEROSPACE CORPORATION "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AEROSPACE CORPORATION BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Copyright (c) 1996-1999 Whistle Communications, Inc.
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* All rights reserved.
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*
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* Subject to the following obligations and disclaimer of warranty, use and
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* redistribution of this software, in source or object code forms, with or
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* without modifications are expressly permitted by Whistle Communications;
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* provided, however, that:
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* 1. Any and all reproductions of the source or object code must include the
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* copyright notice above and the following disclaimer of warranties; and
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* 2. No rights are granted, in any manner or form, to use Whistle
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* Communications, Inc. trademarks, including the mark "WHISTLE
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* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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* such appears in the above copyright notice or in the software.
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*
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* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
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* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
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* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
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* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
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* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
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* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* Author: Brooks Davis <brooks@FreeBSD.org>
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* Derived from: ng_hole.c
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*
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* $FreeBSD$
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*/
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/*
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* This node simply takes IP packets and calls ip_input on them
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/proc.h>
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#include <net/if.h>
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#include <net/if_types.h>
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#include <net/if_var.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <net/netisr.h>
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#include <netgraph/ng_message.h>
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#include <netgraph/netgraph.h>
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#include <netgraph/ng_ip_input.h>
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/* Netgraph methods */
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static ng_constructor_t ngipi_cons;
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static ng_rcvdata_t ngipi_rcvdata;
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static ng_disconnect_t ngipi_disconnect;
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static struct ng_type typestruct = {
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.version = NG_ABI_VERSION,
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.name = NG_IP_INPUT_NODE_TYPE,
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.constructor = ngipi_cons,
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.rcvdata = ngipi_rcvdata,
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.disconnect = ngipi_disconnect,
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};
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NETGRAPH_INIT(ip_input, &typestruct);
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/*
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* Be obliging. but no work to do.
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*/
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static int
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ngipi_cons(node_p node)
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{
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return(0);
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}
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/*
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* Receive data
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*/
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static int
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ngipi_rcvdata(hook_p hook, item_p item)
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{
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struct mbuf *m;
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NGI_GET_M(item, m);
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NG_FREE_ITEM(item);
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if (curthread->td_ng_outbound)
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netisr_queue(NETISR_IP, m);
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else
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netisr_dispatch(NETISR_IP, m);
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return 0;
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}
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/*
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* Hook disconnection
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*/
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static int
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ngipi_disconnect(hook_p hook)
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{
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if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
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ng_rmnode_self(NG_HOOK_NODE(hook));
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return (0);
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}
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