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freebsd-skq/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
$Id$ -> $FreeBSD$
1999-08-28 01:08:13 +00:00
* $FreeBSD$
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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.
2004-06-15 04:13:59 +00:00
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;
BSD 4.4 Lite Kernel Sources
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{
struct socket *so = rp->rcb_socket;
Chance protocol switch method pru_detach() so that it returns void rather than an error. Detaches do not "fail", they other occur or the protocol flags SS_PROTOREF to take ownership of the socket. soclose() no longer looks at so_pcb to see if it's NULL, relying entirely on the protocol to decide whether it's time to free the socket or not using SS_PROTOREF. so_pcb is now entirely owned and managed by the protocol code. Likewise, no longer test so_pcb in other socket functions, such as soreceive(), which have no business digging into protocol internals. Protocol detach routines no longer try to free the socket on detach, this is performed in the socket code if the protocol permits it. In rts_detach(), no longer test for rp != NULL in detach, and likewise in other protocols that don't permit a NULL so_pcb, reduce the incidence of testing for it during detach. netinet and netinet6 are not fully updated to this change, which will be in an upcoming commit. In their current state they may leak memory or panic. MFC after: 3 months
2006-04-01 15:42:02 +00:00
KASSERT(so->so_pcb == rp, ("raw_detach: so_pcb != rp"));
so->so_pcb = NULL;
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
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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);
}
/*
raw_disconnect() now disconnects but does not detach the raw pcb. As a result, raw_uabort() now needs to call raw_detach() directly. As raw_uabort() is never called, and raw_disconnect() is probably not ever actually called in practice, this is likely not a functional change, but improves congruence between protocols, and avoids a NULL raw cb pointer after disconnect, which could result in a panic. MFC after: 1 month
2006-06-02 08:27:15 +00:00
* Disconnect raw socket.
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*/
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;
BSD 4.4 Lite Kernel Sources
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{
#ifdef notdef
if (rp->rcb_faddr)
m_freem(dtom(rp->rcb_faddr));
rp->rcb_faddr = 0;
#endif
}
#ifdef notdef
Added a used include (in ifdefed code).
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#include <sys/mbuf.h>
BSD 4.4 Lite Kernel Sources
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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;
BSD 4.4 Lite Kernel Sources
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{
struct sockaddr *addr = mtod(nam, struct sockaddr *);
register struct rawcb *rp;
if (ifnet == 0)
return (EADDRNOTAVAIL);
rp = sotorawcb(so);
Replaced the misleading uses of a historical artefact M_TRYWAIT with M_WAIT. Removed dead code that assumed that M_TRYWAIT can return NULL; it's not true since the advent of MBUMA. Reviewed by: arch There are ongoing disputes as to whether we want to switch to directly using UMA flags M_WAITOK/M_NOWAIT for mbuf(9) allocation.
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nam = m_copym(nam, 0, M_COPYALL, M_WAIT);
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rp->rcb_laddr = mtod(nam, struct sockaddr *);
return (0);
}
#endif
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