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freebsd-dev/sys/net/raw_cb.c

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/* -> /*- for license, minor formatting changes
2005-01-07 01:45:51 +00:00
/*-
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* Copyright (c) 1980, 1986, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)raw_cb.c 8.1 (Berkeley) 6/10/93
$Id$ -> $FreeBSD$
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* $FreeBSD$
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*/
#include <sys/param.h>
Lock down a socket, milestone 1. o Add a mutex (sb_mtx) to struct sockbuf. This protects the data in a socket buffer. The mutex in the receive buffer also protects the data in struct socket. o Determine the lock strategy for each members in struct socket. o Lock down the following members: - so_count - so_options - so_linger - so_state o Remove *_locked() socket APIs. Make the following socket APIs touching the members above now require a locked socket: - sodisconnect() - soisconnected() - soisconnecting() - soisdisconnected() - soisdisconnecting() - sofree() - soref() - sorele() - sorwakeup() - sotryfree() - sowakeup() - sowwakeup() Reviewed by: alfred
2002-05-20 05:41:09 +00:00
#include <sys/domain.h>
Extend coverage of SOCK_LOCK(so) to include so_count, the socket reference count: - Assert SOCK_LOCK(so) macros that directly manipulate so_count: soref(), sorele(). - Assert SOCK_LOCK(so) in macros/functions that rely on the state of so_count: sofree(), sotryfree(). - Acquire SOCK_LOCK(so) before calling these functions or macros in various contexts in the stack, both at the socket and protocol layers. - In some cases, perform soisdisconnected() before sotryfree(), as this could result in frobbing of a non-present socket if sotryfree() actually frees the socket. - Note that sofree()/sotryfree() will release the socket lock even if they don't free the socket. Submitted by: sam Sponsored by: FreeBSD Foundation Obtained from: BSD/OS
2004-06-12 20:47:32 +00:00
#include <sys/lock.h>
Added used #include - don't depend on <sys/mbuf.h> including <sys/malloc.h> (unless we only use the bogusly shared M*WAIT flags).
1997-09-02 01:19:47 +00:00
#include <sys/malloc.h>
Extend coverage of SOCK_LOCK(so) to include so_count, the socket reference count: - Assert SOCK_LOCK(so) macros that directly manipulate so_count: soref(), sorele(). - Assert SOCK_LOCK(so) in macros/functions that rely on the state of so_count: sofree(), sotryfree(). - Acquire SOCK_LOCK(so) before calling these functions or macros in various contexts in the stack, both at the socket and protocol layers. - In some cases, perform soisdisconnected() before sotryfree(), as this could result in frobbing of a non-present socket if sotryfree() actually frees the socket. - Note that sofree()/sotryfree() will release the socket lock even if they don't free the socket. Submitted by: sam Sponsored by: FreeBSD Foundation Obtained from: BSD/OS
2004-06-12 20:47:32 +00:00
#include <sys/mutex.h>
Lock down a socket, milestone 1. o Add a mutex (sb_mtx) to struct sockbuf. This protects the data in a socket buffer. The mutex in the receive buffer also protects the data in struct socket. o Determine the lock strategy for each members in struct socket. o Lock down the following members: - so_count - so_options - so_linger - so_state o Remove *_locked() socket APIs. Make the following socket APIs touching the members above now require a locked socket: - sodisconnect() - soisconnected() - soisconnecting() - soisdisconnected() - soisdisconnecting() - sofree() - soref() - sorele() - sorwakeup() - sotryfree() - sowakeup() - sowwakeup() Reviewed by: alfred
2002-05-20 05:41:09 +00:00
#include <sys/protosw.h>
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#include <sys/socket.h>
#include <sys/socketvar.h>
Include <sys.systm.h> for the declaration of some atomic functions -- don't depend on namespace pollution in <sys/mutex.h>.
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#include <sys/systm.h>
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#include <net/raw_cb.h>
/*
Remove trailing whitespace.
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* Routines to manage the raw protocol control blocks.
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*
* TODO:
* hash lookups by protocol family/protocol + address family
* take care of unique address problems per AF?
* redo address binding to allow wildcards
*/
Lock down rawcb_list, a global list of control blocks for raw sockets, using rawcb_mtx. Hold this mutex while modifying or iterating over the control list; this means that the mutex is held over calls into socket delivery code, which no longer causes a lock order reversal as the routing socket code uses a netisr to avoid recursing socket -> routing -> socket. Note: Locking of IPsec consumers of rawcb_list is not included in this commit.
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struct mtx rawcb_mtx;
Use LIST macros instead of insque/remque
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struct rawcb_list_head rawcb_list;
Constify raw_sendspace and raw_recvspace, as they're not mutable.
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const static u_long raw_sendspace = RAWSNDQ;
const static u_long raw_recvspace = RAWRCVQ;
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/*
* Allocate a control block and a nominal amount
* of buffer space for the socket.
*/
int
Back out some style changes. They are not urgent, I will put them back in after 5.0 is out. Requested by: sam Approved by: re
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raw_attach(so, proto)
register struct socket *so;
int proto;
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{
Back out some style changes. They are not urgent, I will put them back in after 5.0 is out. Requested by: sam Approved by: re
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register struct rawcb *rp = sotorawcb(so);
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int error;
/*
* It is assumed that raw_attach is called
* after space has been allocated for the
* rawcb.
*/
if (rp == 0)
return (ENOBUFS);
Cosmetics: to silence gcc -wall.
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error = soreserve(so, raw_sendspace, raw_recvspace);
if (error)
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return (error);
rp->rcb_socket = so;
rp->rcb_proto.sp_family = so->so_proto->pr_domain->dom_family;
rp->rcb_proto.sp_protocol = proto;
Lock down rawcb_list, a global list of control blocks for raw sockets, using rawcb_mtx. Hold this mutex while modifying or iterating over the control list; this means that the mutex is held over calls into socket delivery code, which no longer causes a lock order reversal as the routing socket code uses a netisr to avoid recursing socket -> routing -> socket. Note: Locking of IPsec consumers of rawcb_list is not included in this commit.
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mtx_lock(&rawcb_mtx);
Use LIST macros instead of insque/remque
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LIST_INSERT_HEAD(&rawcb_list, rp, list);
Lock down rawcb_list, a global list of control blocks for raw sockets, using rawcb_mtx. Hold this mutex while modifying or iterating over the control list; this means that the mutex is held over calls into socket delivery code, which no longer causes a lock order reversal as the routing socket code uses a netisr to avoid recursing socket -> routing -> socket. Note: Locking of IPsec consumers of rawcb_list is not included in this commit.
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mtx_unlock(&rawcb_mtx);
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return (0);
}
/*
* Detach the raw connection block and discard
* socket resources.
*/
void
Back out some style changes. They are not urgent, I will put them back in after 5.0 is out. Requested by: sam Approved by: re
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raw_detach(rp)
register struct rawcb *rp;
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{
struct socket *so = rp->rcb_socket;
Push acquisition of the accept mutex out of sofree() into the caller (sorele()/sotryfree()): - This permits the caller to acquire the accept mutex before the socket mutex, avoiding sofree() having to drop the socket mutex and re-order, which could lead to races permitting more than one thread to enter sofree() after a socket is ready to be free'd. - This also covers clearing of the so_pcb weak socket reference from the protocol to the socket, preventing races in clearing and evaluation of the reference such that sofree() might be called more than once on the same socket. This appears to close a race I was able to easily trigger by repeatedly opening and resetting TCP connections to a host, in which the tcp_close() code called as a result of the RST raced with the close() of the accepted socket in the user process resulting in simultaneous attempts to de-allocate the same socket. The new locking increases the overhead for operations that may potentially free the socket, so we will want to revise the synchronization strategy here as we normalize the reference counting model for sockets. The use of the accept mutex in freeing of sockets that are not listen sockets is primarily motivated by the potential need to remove the socket from the incomplete connection queue on its parent (listen) socket, so cleaning up the reference model here may allow us to substantially weaken the synchronization requirements. RELENG_5_3 candidate. MFC after: 3 days Reviewed by: dwhite Discussed with: gnn, dwhite, green Reported by: Marc UBM Bocklet <ubm at u-boot-man dot de> Reported by: Vlad <marchenko at gmail dot com>
2004-10-18 22:19:43 +00:00
ACCEPT_LOCK();
Extend coverage of SOCK_LOCK(so) to include so_count, the socket reference count: - Assert SOCK_LOCK(so) macros that directly manipulate so_count: soref(), sorele(). - Assert SOCK_LOCK(so) in macros/functions that rely on the state of so_count: sofree(), sotryfree(). - Acquire SOCK_LOCK(so) before calling these functions or macros in various contexts in the stack, both at the socket and protocol layers. - In some cases, perform soisdisconnected() before sotryfree(), as this could result in frobbing of a non-present socket if sotryfree() actually frees the socket. - Note that sofree()/sotryfree() will release the socket lock even if they don't free the socket. Submitted by: sam Sponsored by: FreeBSD Foundation Obtained from: BSD/OS
2004-06-12 20:47:32 +00:00
SOCK_LOCK(so);
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so->so_pcb = 0;
Give struct socket structures a ref counting interface similar to vnodes. This will hopefully serve as a base from which we can expand the MP code. We currently do not attempt to obtain any mutex or SX locks, but the door is open to add them when we nail down exactly how that part of it is going to work.
2001-11-17 03:07:11 +00:00
sotryfree(so);
Acquire the raw_cb mutex around LIST_REMOVE() of a raw socket control block from the global raw socket list. Submitted by: Roselyn Lee <rosel at verniernetworks dot com> MFC after: 1 week
2005-01-24 22:56:09 +00:00
mtx_lock(&rawcb_mtx);
Use LIST macros instead of insque/remque
1997-04-14 18:23:25 +00:00
LIST_REMOVE(rp, list);
Acquire the raw_cb mutex around LIST_REMOVE() of a raw socket control block from the global raw socket list. Submitted by: Roselyn Lee <rosel at verniernetworks dot com> MFC after: 1 week
2005-01-24 22:56:09 +00:00
mtx_unlock(&rawcb_mtx);
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#ifdef notdef
if (rp->rcb_laddr)
m_freem(dtom(rp->rcb_laddr));
rp->rcb_laddr = 0;
#endif
free((caddr_t)(rp), M_PCB);
}
/*
* Disconnect and possibly release resources.
*/
void
Back out some style changes. They are not urgent, I will put them back in after 5.0 is out. Requested by: sam Approved by: re
2002-11-20 19:00:54 +00:00
raw_disconnect(rp)
struct rawcb *rp;
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{
#ifdef notdef
if (rp->rcb_faddr)
m_freem(dtom(rp->rcb_faddr));
rp->rcb_faddr = 0;
#endif
Back out my lats commit of locking down a socket, it conflicts with hsu's work. Requested by: hsu
2002-05-31 11:52:35 +00:00
if (rp->rcb_socket->so_state & SS_NOFDREF)
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raw_detach(rp);
}
#ifdef notdef
Added a used include (in ifdefed code).
1998-06-07 12:02:59 +00:00
#include <sys/mbuf.h>
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int
Back out some style changes. They are not urgent, I will put them back in after 5.0 is out. Requested by: sam Approved by: re
2002-11-20 19:00:54 +00:00
raw_bind(so, nam)
register struct socket *so;
struct mbuf *nam;
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{
struct sockaddr *addr = mtod(nam, struct sockaddr *);
register struct rawcb *rp;
if (ifnet == 0)
return (EADDRNOTAVAIL);
rp = sotorawcb(so);
Back out M_* changes, per decision of the TRB. Approved by: trb
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nam = m_copym(nam, 0, M_COPYALL, M_TRYWAIT);
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rp->rcb_laddr = mtod(nam, struct sockaddr *);
return (0);
}
#endif
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