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
1525 lines
36 KiB
C
1525 lines
36 KiB
C
/*-
|
|
* Copyright (c) 1982, 1986, 1988, 1990, 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.
|
|
*
|
|
* @(#)uipc_socket2.c 8.1 (Berkeley) 6/10/93
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_mac.h"
|
|
#include "opt_param.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/aio.h> /* for aio_swake proto */
|
|
#include <sys/domain.h>
|
|
#include <sys/event.h>
|
|
#include <sys/file.h> /* for maxfiles */
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mac.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/protosw.h>
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|
#include <sys/resourcevar.h>
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|
#include <sys/signalvar.h>
|
|
#include <sys/socket.h>
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|
#include <sys/socketvar.h>
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|
#include <sys/stat.h>
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|
#include <sys/sysctl.h>
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|
#include <sys/systm.h>
|
|
|
|
int maxsockets;
|
|
|
|
void (*aio_swake)(struct socket *, struct sockbuf *);
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|
|
|
/*
|
|
* Primitive routines for operating on sockets and socket buffers
|
|
*/
|
|
|
|
u_long sb_max = SB_MAX;
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|
static u_long sb_max_adj =
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|
SB_MAX * MCLBYTES / (MSIZE + MCLBYTES); /* adjusted sb_max */
|
|
|
|
static u_long sb_efficiency = 8; /* parameter for sbreserve() */
|
|
|
|
#ifdef REGRESSION
|
|
static int regression_sonewconn_earlytest = 1;
|
|
SYSCTL_INT(_regression, OID_AUTO, sonewconn_earlytest, CTLFLAG_RW,
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|
®ression_sonewconn_earlytest, 0, "Perform early sonewconn limit test");
|
|
#endif
|
|
|
|
/*
|
|
* Procedures to manipulate state flags of socket
|
|
* and do appropriate wakeups. Normal sequence from the
|
|
* active (originating) side is that soisconnecting() is
|
|
* called during processing of connect() call,
|
|
* resulting in an eventual call to soisconnected() if/when the
|
|
* connection is established. When the connection is torn down
|
|
* soisdisconnecting() is called during processing of disconnect() call,
|
|
* and soisdisconnected() is called when the connection to the peer
|
|
* is totally severed. The semantics of these routines are such that
|
|
* connectionless protocols can call soisconnected() and soisdisconnected()
|
|
* only, bypassing the in-progress calls when setting up a ``connection''
|
|
* takes no time.
|
|
*
|
|
* From the passive side, a socket is created with
|
|
* two queues of sockets: so_incomp for connections in progress
|
|
* and so_comp for connections already made and awaiting user acceptance.
|
|
* As a protocol is preparing incoming connections, it creates a socket
|
|
* structure queued on so_incomp by calling sonewconn(). When the connection
|
|
* is established, soisconnected() is called, and transfers the
|
|
* socket structure to so_comp, making it available to accept().
|
|
*
|
|
* If a socket is closed with sockets on either
|
|
* so_incomp or so_comp, these sockets are dropped.
|
|
*
|
|
* If higher level protocols are implemented in
|
|
* the kernel, the wakeups done here will sometimes
|
|
* cause software-interrupt process scheduling.
|
|
*/
|
|
|
|
void
|
|
soisconnecting(so)
|
|
register struct socket *so;
|
|
{
|
|
|
|
SOCK_LOCK(so);
|
|
so->so_state &= ~(SS_ISCONNECTED|SS_ISDISCONNECTING);
|
|
so->so_state |= SS_ISCONNECTING;
|
|
SOCK_UNLOCK(so);
|
|
}
|
|
|
|
void
|
|
soisconnected(so)
|
|
struct socket *so;
|
|
{
|
|
struct socket *head;
|
|
|
|
ACCEPT_LOCK();
|
|
SOCK_LOCK(so);
|
|
so->so_state &= ~(SS_ISCONNECTING|SS_ISDISCONNECTING|SS_ISCONFIRMING);
|
|
so->so_state |= SS_ISCONNECTED;
|
|
head = so->so_head;
|
|
if (head != NULL && (so->so_qstate & SQ_INCOMP)) {
|
|
if ((so->so_options & SO_ACCEPTFILTER) == 0) {
|
|
SOCK_UNLOCK(so);
|
|
TAILQ_REMOVE(&head->so_incomp, so, so_list);
|
|
head->so_incqlen--;
|
|
so->so_qstate &= ~SQ_INCOMP;
|
|
TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
|
|
head->so_qlen++;
|
|
so->so_qstate |= SQ_COMP;
|
|
ACCEPT_UNLOCK();
|
|
sorwakeup(head);
|
|
wakeup_one(&head->so_timeo);
|
|
} else {
|
|
ACCEPT_UNLOCK();
|
|
so->so_upcall =
|
|
head->so_accf->so_accept_filter->accf_callback;
|
|
so->so_upcallarg = head->so_accf->so_accept_filter_arg;
|
|
so->so_rcv.sb_flags |= SB_UPCALL;
|
|
so->so_options &= ~SO_ACCEPTFILTER;
|
|
SOCK_UNLOCK(so);
|
|
so->so_upcall(so, so->so_upcallarg, M_DONTWAIT);
|
|
}
|
|
return;
|
|
}
|
|
SOCK_UNLOCK(so);
|
|
ACCEPT_UNLOCK();
|
|
wakeup(&so->so_timeo);
|
|
sorwakeup(so);
|
|
sowwakeup(so);
|
|
}
|
|
|
|
void
|
|
soisdisconnecting(so)
|
|
register struct socket *so;
|
|
{
|
|
|
|
/*
|
|
* XXXRW: This code assumes that SOCK_LOCK(so) and
|
|
* SOCKBUF_LOCK(&so->so_rcv) are the same.
|
|
*/
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
so->so_state &= ~SS_ISCONNECTING;
|
|
so->so_state |= SS_ISDISCONNECTING;
|
|
so->so_rcv.sb_state |= SBS_CANTRCVMORE;
|
|
sorwakeup_locked(so);
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
so->so_snd.sb_state |= SBS_CANTSENDMORE;
|
|
sowwakeup_locked(so);
|
|
wakeup(&so->so_timeo);
|
|
}
|
|
|
|
void
|
|
soisdisconnected(so)
|
|
register struct socket *so;
|
|
{
|
|
|
|
/*
|
|
* XXXRW: This code assumes that SOCK_LOCK(so) and
|
|
* SOCKBUF_LOCK(&so->so_rcv) are the same.
|
|
*/
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
so->so_state &= ~(SS_ISCONNECTING|SS_ISCONNECTED|SS_ISDISCONNECTING);
|
|
so->so_state |= SS_ISDISCONNECTED;
|
|
so->so_rcv.sb_state |= SBS_CANTRCVMORE;
|
|
sorwakeup_locked(so);
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
so->so_snd.sb_state |= SBS_CANTSENDMORE;
|
|
sbdrop_locked(&so->so_snd, so->so_snd.sb_cc);
|
|
sowwakeup_locked(so);
|
|
wakeup(&so->so_timeo);
|
|
}
|
|
|
|
/*
|
|
* When an attempt at a new connection is noted on a socket
|
|
* which accepts connections, sonewconn is called. If the
|
|
* connection is possible (subject to space constraints, etc.)
|
|
* then we allocate a new structure, propoerly linked into the
|
|
* data structure of the original socket, and return this.
|
|
* Connstatus may be 0, or SO_ISCONFIRMING, or SO_ISCONNECTED.
|
|
*
|
|
* note: the ref count on the socket is 0 on return
|
|
*/
|
|
struct socket *
|
|
sonewconn(head, connstatus)
|
|
register struct socket *head;
|
|
int connstatus;
|
|
{
|
|
register struct socket *so;
|
|
int over;
|
|
|
|
ACCEPT_LOCK();
|
|
over = (head->so_qlen > 3 * head->so_qlimit / 2);
|
|
ACCEPT_UNLOCK();
|
|
#ifdef REGRESSION
|
|
if (regression_sonewconn_earlytest && over)
|
|
#else
|
|
if (over)
|
|
#endif
|
|
return (NULL);
|
|
so = soalloc(M_NOWAIT);
|
|
if (so == NULL)
|
|
return (NULL);
|
|
if ((head->so_options & SO_ACCEPTFILTER) != 0)
|
|
connstatus = 0;
|
|
so->so_head = head;
|
|
so->so_type = head->so_type;
|
|
so->so_options = head->so_options &~ SO_ACCEPTCONN;
|
|
so->so_linger = head->so_linger;
|
|
so->so_state = head->so_state | SS_NOFDREF;
|
|
so->so_proto = head->so_proto;
|
|
so->so_timeo = head->so_timeo;
|
|
so->so_cred = crhold(head->so_cred);
|
|
#ifdef MAC
|
|
SOCK_LOCK(head);
|
|
mac_create_socket_from_socket(head, so);
|
|
SOCK_UNLOCK(head);
|
|
#endif
|
|
knlist_init(&so->so_rcv.sb_sel.si_note, SOCKBUF_MTX(&so->so_rcv),
|
|
NULL, NULL, NULL);
|
|
knlist_init(&so->so_snd.sb_sel.si_note, SOCKBUF_MTX(&so->so_snd),
|
|
NULL, NULL, NULL);
|
|
if (soreserve(so, head->so_snd.sb_hiwat, head->so_rcv.sb_hiwat) ||
|
|
(*so->so_proto->pr_usrreqs->pru_attach)(so, 0, NULL)) {
|
|
sodealloc(so);
|
|
return (NULL);
|
|
}
|
|
so->so_state |= connstatus;
|
|
ACCEPT_LOCK();
|
|
if (connstatus) {
|
|
TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
|
|
so->so_qstate |= SQ_COMP;
|
|
head->so_qlen++;
|
|
} else {
|
|
/*
|
|
* Keep removing sockets from the head until there's room for
|
|
* us to insert on the tail. In pre-locking revisions, this
|
|
* was a simple if(), but as we could be racing with other
|
|
* threads and soabort() requires dropping locks, we must
|
|
* loop waiting for the condition to be true.
|
|
*/
|
|
while (head->so_incqlen > head->so_qlimit) {
|
|
struct socket *sp;
|
|
sp = TAILQ_FIRST(&head->so_incomp);
|
|
TAILQ_REMOVE(&head->so_incomp, sp, so_list);
|
|
head->so_incqlen--;
|
|
sp->so_qstate &= ~SQ_INCOMP;
|
|
sp->so_head = NULL;
|
|
ACCEPT_UNLOCK();
|
|
soabort(sp);
|
|
ACCEPT_LOCK();
|
|
}
|
|
TAILQ_INSERT_TAIL(&head->so_incomp, so, so_list);
|
|
so->so_qstate |= SQ_INCOMP;
|
|
head->so_incqlen++;
|
|
}
|
|
ACCEPT_UNLOCK();
|
|
if (connstatus) {
|
|
sorwakeup(head);
|
|
wakeup_one(&head->so_timeo);
|
|
}
|
|
return (so);
|
|
}
|
|
|
|
/*
|
|
* Socantsendmore indicates that no more data will be sent on the
|
|
* socket; it would normally be applied to a socket when the user
|
|
* informs the system that no more data is to be sent, by the protocol
|
|
* code (in case PRU_SHUTDOWN). Socantrcvmore indicates that no more data
|
|
* will be received, and will normally be applied to the socket by a
|
|
* protocol when it detects that the peer will send no more data.
|
|
* Data queued for reading in the socket may yet be read.
|
|
*/
|
|
void
|
|
socantsendmore_locked(so)
|
|
struct socket *so;
|
|
{
|
|
|
|
SOCKBUF_LOCK_ASSERT(&so->so_snd);
|
|
|
|
so->so_snd.sb_state |= SBS_CANTSENDMORE;
|
|
sowwakeup_locked(so);
|
|
mtx_assert(SOCKBUF_MTX(&so->so_snd), MA_NOTOWNED);
|
|
}
|
|
|
|
void
|
|
socantsendmore(so)
|
|
struct socket *so;
|
|
{
|
|
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
socantsendmore_locked(so);
|
|
mtx_assert(SOCKBUF_MTX(&so->so_snd), MA_NOTOWNED);
|
|
}
|
|
|
|
void
|
|
socantrcvmore_locked(so)
|
|
struct socket *so;
|
|
{
|
|
|
|
SOCKBUF_LOCK_ASSERT(&so->so_rcv);
|
|
|
|
so->so_rcv.sb_state |= SBS_CANTRCVMORE;
|
|
sorwakeup_locked(so);
|
|
mtx_assert(SOCKBUF_MTX(&so->so_rcv), MA_NOTOWNED);
|
|
}
|
|
|
|
void
|
|
socantrcvmore(so)
|
|
struct socket *so;
|
|
{
|
|
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
socantrcvmore_locked(so);
|
|
mtx_assert(SOCKBUF_MTX(&so->so_rcv), MA_NOTOWNED);
|
|
}
|
|
|
|
/*
|
|
* Wait for data to arrive at/drain from a socket buffer.
|
|
*/
|
|
int
|
|
sbwait(sb)
|
|
struct sockbuf *sb;
|
|
{
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
|
|
sb->sb_flags |= SB_WAIT;
|
|
return (msleep(&sb->sb_cc, &sb->sb_mtx,
|
|
(sb->sb_flags & SB_NOINTR) ? PSOCK : PSOCK | PCATCH, "sbwait",
|
|
sb->sb_timeo));
|
|
}
|
|
|
|
/*
|
|
* Lock a sockbuf already known to be locked;
|
|
* return any error returned from sleep (EINTR).
|
|
*/
|
|
int
|
|
sb_lock(sb)
|
|
register struct sockbuf *sb;
|
|
{
|
|
int error;
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
|
|
while (sb->sb_flags & SB_LOCK) {
|
|
sb->sb_flags |= SB_WANT;
|
|
error = msleep(&sb->sb_flags, &sb->sb_mtx,
|
|
(sb->sb_flags & SB_NOINTR) ? PSOCK : PSOCK|PCATCH,
|
|
"sblock", 0);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
sb->sb_flags |= SB_LOCK;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Wakeup processes waiting on a socket buffer. Do asynchronous
|
|
* notification via SIGIO if the socket has the SS_ASYNC flag set.
|
|
*
|
|
* Called with the socket buffer lock held; will release the lock by the end
|
|
* of the function. This allows the caller to acquire the socket buffer lock
|
|
* while testing for the need for various sorts of wakeup and hold it through
|
|
* to the point where it's no longer required. We currently hold the lock
|
|
* through calls out to other subsystems (with the exception of kqueue), and
|
|
* then release it to avoid lock order issues. It's not clear that's
|
|
* correct.
|
|
*/
|
|
void
|
|
sowakeup(so, sb)
|
|
register struct socket *so;
|
|
register struct sockbuf *sb;
|
|
{
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
|
|
selwakeuppri(&sb->sb_sel, PSOCK);
|
|
sb->sb_flags &= ~SB_SEL;
|
|
if (sb->sb_flags & SB_WAIT) {
|
|
sb->sb_flags &= ~SB_WAIT;
|
|
wakeup(&sb->sb_cc);
|
|
}
|
|
KNOTE_LOCKED(&sb->sb_sel.si_note, 0);
|
|
SOCKBUF_UNLOCK(sb);
|
|
if ((so->so_state & SS_ASYNC) && so->so_sigio != NULL)
|
|
pgsigio(&so->so_sigio, SIGIO, 0);
|
|
if (sb->sb_flags & SB_UPCALL)
|
|
(*so->so_upcall)(so, so->so_upcallarg, M_DONTWAIT);
|
|
if (sb->sb_flags & SB_AIO)
|
|
aio_swake(so, sb);
|
|
mtx_assert(SOCKBUF_MTX(sb), MA_NOTOWNED);
|
|
}
|
|
|
|
/*
|
|
* Socket buffer (struct sockbuf) utility routines.
|
|
*
|
|
* Each socket contains two socket buffers: one for sending data and
|
|
* one for receiving data. Each buffer contains a queue of mbufs,
|
|
* information about the number of mbufs and amount of data in the
|
|
* queue, and other fields allowing select() statements and notification
|
|
* on data availability to be implemented.
|
|
*
|
|
* Data stored in a socket buffer is maintained as a list of records.
|
|
* Each record is a list of mbufs chained together with the m_next
|
|
* field. Records are chained together with the m_nextpkt field. The upper
|
|
* level routine soreceive() expects the following conventions to be
|
|
* observed when placing information in the receive buffer:
|
|
*
|
|
* 1. If the protocol requires each message be preceded by the sender's
|
|
* name, then a record containing that name must be present before
|
|
* any associated data (mbuf's must be of type MT_SONAME).
|
|
* 2. If the protocol supports the exchange of ``access rights'' (really
|
|
* just additional data associated with the message), and there are
|
|
* ``rights'' to be received, then a record containing this data
|
|
* should be present (mbuf's must be of type MT_RIGHTS).
|
|
* 3. If a name or rights record exists, then it must be followed by
|
|
* a data record, perhaps of zero length.
|
|
*
|
|
* Before using a new socket structure it is first necessary to reserve
|
|
* buffer space to the socket, by calling sbreserve(). This should commit
|
|
* some of the available buffer space in the system buffer pool for the
|
|
* socket (currently, it does nothing but enforce limits). The space
|
|
* should be released by calling sbrelease() when the socket is destroyed.
|
|
*/
|
|
|
|
int
|
|
soreserve(so, sndcc, rcvcc)
|
|
register struct socket *so;
|
|
u_long sndcc, rcvcc;
|
|
{
|
|
struct thread *td = curthread;
|
|
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
if (sbreserve_locked(&so->so_snd, sndcc, so, td) == 0)
|
|
goto bad;
|
|
if (sbreserve_locked(&so->so_rcv, rcvcc, so, td) == 0)
|
|
goto bad2;
|
|
if (so->so_rcv.sb_lowat == 0)
|
|
so->so_rcv.sb_lowat = 1;
|
|
if (so->so_snd.sb_lowat == 0)
|
|
so->so_snd.sb_lowat = MCLBYTES;
|
|
if (so->so_snd.sb_lowat > so->so_snd.sb_hiwat)
|
|
so->so_snd.sb_lowat = so->so_snd.sb_hiwat;
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
return (0);
|
|
bad2:
|
|
sbrelease_locked(&so->so_snd, so);
|
|
bad:
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
return (ENOBUFS);
|
|
}
|
|
|
|
static int
|
|
sysctl_handle_sb_max(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error = 0;
|
|
u_long old_sb_max = sb_max;
|
|
|
|
error = SYSCTL_OUT(req, arg1, sizeof(u_long));
|
|
if (error || !req->newptr)
|
|
return (error);
|
|
error = SYSCTL_IN(req, arg1, sizeof(u_long));
|
|
if (error)
|
|
return (error);
|
|
if (sb_max < MSIZE + MCLBYTES) {
|
|
sb_max = old_sb_max;
|
|
return (EINVAL);
|
|
}
|
|
sb_max_adj = (u_quad_t)sb_max * MCLBYTES / (MSIZE + MCLBYTES);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Allot mbufs to a sockbuf.
|
|
* Attempt to scale mbmax so that mbcnt doesn't become limiting
|
|
* if buffering efficiency is near the normal case.
|
|
*/
|
|
int
|
|
sbreserve_locked(sb, cc, so, td)
|
|
struct sockbuf *sb;
|
|
u_long cc;
|
|
struct socket *so;
|
|
struct thread *td;
|
|
{
|
|
rlim_t sbsize_limit;
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
|
|
/*
|
|
* td will only be NULL when we're in an interrupt
|
|
* (e.g. in tcp_input())
|
|
*/
|
|
if (cc > sb_max_adj)
|
|
return (0);
|
|
if (td != NULL) {
|
|
PROC_LOCK(td->td_proc);
|
|
sbsize_limit = lim_cur(td->td_proc, RLIMIT_SBSIZE);
|
|
PROC_UNLOCK(td->td_proc);
|
|
} else
|
|
sbsize_limit = RLIM_INFINITY;
|
|
if (!chgsbsize(so->so_cred->cr_uidinfo, &sb->sb_hiwat, cc,
|
|
sbsize_limit))
|
|
return (0);
|
|
sb->sb_mbmax = min(cc * sb_efficiency, sb_max);
|
|
if (sb->sb_lowat > sb->sb_hiwat)
|
|
sb->sb_lowat = sb->sb_hiwat;
|
|
return (1);
|
|
}
|
|
|
|
int
|
|
sbreserve(sb, cc, so, td)
|
|
struct sockbuf *sb;
|
|
u_long cc;
|
|
struct socket *so;
|
|
struct thread *td;
|
|
{
|
|
int error;
|
|
|
|
SOCKBUF_LOCK(sb);
|
|
error = sbreserve_locked(sb, cc, so, td);
|
|
SOCKBUF_UNLOCK(sb);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Free mbufs held by a socket, and reserved mbuf space.
|
|
*/
|
|
void
|
|
sbrelease_locked(sb, so)
|
|
struct sockbuf *sb;
|
|
struct socket *so;
|
|
{
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
|
|
sbflush_locked(sb);
|
|
(void)chgsbsize(so->so_cred->cr_uidinfo, &sb->sb_hiwat, 0,
|
|
RLIM_INFINITY);
|
|
sb->sb_mbmax = 0;
|
|
}
|
|
|
|
void
|
|
sbrelease(sb, so)
|
|
struct sockbuf *sb;
|
|
struct socket *so;
|
|
{
|
|
|
|
SOCKBUF_LOCK(sb);
|
|
sbrelease_locked(sb, so);
|
|
SOCKBUF_UNLOCK(sb);
|
|
}
|
|
/*
|
|
* Routines to add and remove
|
|
* data from an mbuf queue.
|
|
*
|
|
* The routines sbappend() or sbappendrecord() are normally called to
|
|
* append new mbufs to a socket buffer, after checking that adequate
|
|
* space is available, comparing the function sbspace() with the amount
|
|
* of data to be added. sbappendrecord() differs from sbappend() in
|
|
* that data supplied is treated as the beginning of a new record.
|
|
* To place a sender's address, optional access rights, and data in a
|
|
* socket receive buffer, sbappendaddr() should be used. To place
|
|
* access rights and data in a socket receive buffer, sbappendrights()
|
|
* should be used. In either case, the new data begins a new record.
|
|
* Note that unlike sbappend() and sbappendrecord(), these routines check
|
|
* for the caller that there will be enough space to store the data.
|
|
* Each fails if there is not enough space, or if it cannot find mbufs
|
|
* to store additional information in.
|
|
*
|
|
* Reliable protocols may use the socket send buffer to hold data
|
|
* awaiting acknowledgement. Data is normally copied from a socket
|
|
* send buffer in a protocol with m_copy for output to a peer,
|
|
* and then removing the data from the socket buffer with sbdrop()
|
|
* or sbdroprecord() when the data is acknowledged by the peer.
|
|
*/
|
|
|
|
#ifdef SOCKBUF_DEBUG
|
|
void
|
|
sblastrecordchk(struct sockbuf *sb, const char *file, int line)
|
|
{
|
|
struct mbuf *m = sb->sb_mb;
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
|
|
while (m && m->m_nextpkt)
|
|
m = m->m_nextpkt;
|
|
|
|
if (m != sb->sb_lastrecord) {
|
|
printf("%s: sb_mb %p sb_lastrecord %p last %p\n",
|
|
__func__, sb->sb_mb, sb->sb_lastrecord, m);
|
|
printf("packet chain:\n");
|
|
for (m = sb->sb_mb; m != NULL; m = m->m_nextpkt)
|
|
printf("\t%p\n", m);
|
|
panic("%s from %s:%u", __func__, file, line);
|
|
}
|
|
}
|
|
|
|
void
|
|
sblastmbufchk(struct sockbuf *sb, const char *file, int line)
|
|
{
|
|
struct mbuf *m = sb->sb_mb;
|
|
struct mbuf *n;
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
|
|
while (m && m->m_nextpkt)
|
|
m = m->m_nextpkt;
|
|
|
|
while (m && m->m_next)
|
|
m = m->m_next;
|
|
|
|
if (m != sb->sb_mbtail) {
|
|
printf("%s: sb_mb %p sb_mbtail %p last %p\n",
|
|
__func__, sb->sb_mb, sb->sb_mbtail, m);
|
|
printf("packet tree:\n");
|
|
for (m = sb->sb_mb; m != NULL; m = m->m_nextpkt) {
|
|
printf("\t");
|
|
for (n = m; n != NULL; n = n->m_next)
|
|
printf("%p ", n);
|
|
printf("\n");
|
|
}
|
|
panic("%s from %s:%u", __func__, file, line);
|
|
}
|
|
}
|
|
#endif /* SOCKBUF_DEBUG */
|
|
|
|
#define SBLINKRECORD(sb, m0) do { \
|
|
SOCKBUF_LOCK_ASSERT(sb); \
|
|
if ((sb)->sb_lastrecord != NULL) \
|
|
(sb)->sb_lastrecord->m_nextpkt = (m0); \
|
|
else \
|
|
(sb)->sb_mb = (m0); \
|
|
(sb)->sb_lastrecord = (m0); \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
/*
|
|
* Append mbuf chain m to the last record in the
|
|
* socket buffer sb. The additional space associated
|
|
* the mbuf chain is recorded in sb. Empty mbufs are
|
|
* discarded and mbufs are compacted where possible.
|
|
*/
|
|
void
|
|
sbappend_locked(sb, m)
|
|
struct sockbuf *sb;
|
|
struct mbuf *m;
|
|
{
|
|
register struct mbuf *n;
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
|
|
if (m == 0)
|
|
return;
|
|
|
|
SBLASTRECORDCHK(sb);
|
|
n = sb->sb_mb;
|
|
if (n) {
|
|
while (n->m_nextpkt)
|
|
n = n->m_nextpkt;
|
|
do {
|
|
if (n->m_flags & M_EOR) {
|
|
sbappendrecord_locked(sb, m); /* XXXXXX!!!! */
|
|
return;
|
|
}
|
|
} while (n->m_next && (n = n->m_next));
|
|
} else {
|
|
/*
|
|
* XXX Would like to simply use sb_mbtail here, but
|
|
* XXX I need to verify that I won't miss an EOR that
|
|
* XXX way.
|
|
*/
|
|
if ((n = sb->sb_lastrecord) != NULL) {
|
|
do {
|
|
if (n->m_flags & M_EOR) {
|
|
sbappendrecord_locked(sb, m); /* XXXXXX!!!! */
|
|
return;
|
|
}
|
|
} while (n->m_next && (n = n->m_next));
|
|
} else {
|
|
/*
|
|
* If this is the first record in the socket buffer,
|
|
* it's also the last record.
|
|
*/
|
|
sb->sb_lastrecord = m;
|
|
}
|
|
}
|
|
sbcompress(sb, m, n);
|
|
SBLASTRECORDCHK(sb);
|
|
}
|
|
|
|
/*
|
|
* Append mbuf chain m to the last record in the
|
|
* socket buffer sb. The additional space associated
|
|
* the mbuf chain is recorded in sb. Empty mbufs are
|
|
* discarded and mbufs are compacted where possible.
|
|
*/
|
|
void
|
|
sbappend(sb, m)
|
|
struct sockbuf *sb;
|
|
struct mbuf *m;
|
|
{
|
|
|
|
SOCKBUF_LOCK(sb);
|
|
sbappend_locked(sb, m);
|
|
SOCKBUF_UNLOCK(sb);
|
|
}
|
|
|
|
/*
|
|
* This version of sbappend() should only be used when the caller
|
|
* absolutely knows that there will never be more than one record
|
|
* in the socket buffer, that is, a stream protocol (such as TCP).
|
|
*/
|
|
void
|
|
sbappendstream_locked(struct sockbuf *sb, struct mbuf *m)
|
|
{
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
|
|
KASSERT(m->m_nextpkt == NULL,("sbappendstream 0"));
|
|
KASSERT(sb->sb_mb == sb->sb_lastrecord,("sbappendstream 1"));
|
|
|
|
SBLASTMBUFCHK(sb);
|
|
|
|
sbcompress(sb, m, sb->sb_mbtail);
|
|
|
|
sb->sb_lastrecord = sb->sb_mb;
|
|
SBLASTRECORDCHK(sb);
|
|
}
|
|
|
|
/*
|
|
* This version of sbappend() should only be used when the caller
|
|
* absolutely knows that there will never be more than one record
|
|
* in the socket buffer, that is, a stream protocol (such as TCP).
|
|
*/
|
|
void
|
|
sbappendstream(struct sockbuf *sb, struct mbuf *m)
|
|
{
|
|
|
|
SOCKBUF_LOCK(sb);
|
|
sbappendstream_locked(sb, m);
|
|
SOCKBUF_UNLOCK(sb);
|
|
}
|
|
|
|
#ifdef SOCKBUF_DEBUG
|
|
void
|
|
sbcheck(sb)
|
|
struct sockbuf *sb;
|
|
{
|
|
struct mbuf *m;
|
|
struct mbuf *n = 0;
|
|
u_long len = 0, mbcnt = 0;
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
|
|
for (m = sb->sb_mb; m; m = n) {
|
|
n = m->m_nextpkt;
|
|
for (; m; m = m->m_next) {
|
|
len += m->m_len;
|
|
mbcnt += MSIZE;
|
|
if (m->m_flags & M_EXT) /*XXX*/ /* pretty sure this is bogus */
|
|
mbcnt += m->m_ext.ext_size;
|
|
}
|
|
}
|
|
if (len != sb->sb_cc || mbcnt != sb->sb_mbcnt) {
|
|
printf("cc %ld != %u || mbcnt %ld != %u\n", len, sb->sb_cc,
|
|
mbcnt, sb->sb_mbcnt);
|
|
panic("sbcheck");
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* As above, except the mbuf chain
|
|
* begins a new record.
|
|
*/
|
|
void
|
|
sbappendrecord_locked(sb, m0)
|
|
register struct sockbuf *sb;
|
|
register struct mbuf *m0;
|
|
{
|
|
register struct mbuf *m;
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
|
|
if (m0 == 0)
|
|
return;
|
|
m = sb->sb_mb;
|
|
if (m)
|
|
while (m->m_nextpkt)
|
|
m = m->m_nextpkt;
|
|
/*
|
|
* Put the first mbuf on the queue.
|
|
* Note this permits zero length records.
|
|
*/
|
|
sballoc(sb, m0);
|
|
SBLASTRECORDCHK(sb);
|
|
SBLINKRECORD(sb, m0);
|
|
if (m)
|
|
m->m_nextpkt = m0;
|
|
else
|
|
sb->sb_mb = m0;
|
|
m = m0->m_next;
|
|
m0->m_next = 0;
|
|
if (m && (m0->m_flags & M_EOR)) {
|
|
m0->m_flags &= ~M_EOR;
|
|
m->m_flags |= M_EOR;
|
|
}
|
|
sbcompress(sb, m, m0);
|
|
}
|
|
|
|
/*
|
|
* As above, except the mbuf chain
|
|
* begins a new record.
|
|
*/
|
|
void
|
|
sbappendrecord(sb, m0)
|
|
register struct sockbuf *sb;
|
|
register struct mbuf *m0;
|
|
{
|
|
|
|
SOCKBUF_LOCK(sb);
|
|
sbappendrecord_locked(sb, m0);
|
|
SOCKBUF_UNLOCK(sb);
|
|
}
|
|
|
|
/*
|
|
* As above except that OOB data
|
|
* is inserted at the beginning of the sockbuf,
|
|
* but after any other OOB data.
|
|
*/
|
|
void
|
|
sbinsertoob_locked(sb, m0)
|
|
register struct sockbuf *sb;
|
|
register struct mbuf *m0;
|
|
{
|
|
register struct mbuf *m;
|
|
register struct mbuf **mp;
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
|
|
if (m0 == 0)
|
|
return;
|
|
for (mp = &sb->sb_mb; *mp ; mp = &((*mp)->m_nextpkt)) {
|
|
m = *mp;
|
|
again:
|
|
switch (m->m_type) {
|
|
|
|
case MT_OOBDATA:
|
|
continue; /* WANT next train */
|
|
|
|
case MT_CONTROL:
|
|
m = m->m_next;
|
|
if (m)
|
|
goto again; /* inspect THIS train further */
|
|
}
|
|
break;
|
|
}
|
|
/*
|
|
* Put the first mbuf on the queue.
|
|
* Note this permits zero length records.
|
|
*/
|
|
sballoc(sb, m0);
|
|
m0->m_nextpkt = *mp;
|
|
*mp = m0;
|
|
m = m0->m_next;
|
|
m0->m_next = 0;
|
|
if (m && (m0->m_flags & M_EOR)) {
|
|
m0->m_flags &= ~M_EOR;
|
|
m->m_flags |= M_EOR;
|
|
}
|
|
sbcompress(sb, m, m0);
|
|
}
|
|
|
|
/*
|
|
* As above except that OOB data
|
|
* is inserted at the beginning of the sockbuf,
|
|
* but after any other OOB data.
|
|
*/
|
|
void
|
|
sbinsertoob(sb, m0)
|
|
register struct sockbuf *sb;
|
|
register struct mbuf *m0;
|
|
{
|
|
|
|
SOCKBUF_LOCK(sb);
|
|
sbinsertoob_locked(sb, m0);
|
|
SOCKBUF_UNLOCK(sb);
|
|
}
|
|
|
|
/*
|
|
* Append address and data, and optionally, control (ancillary) data
|
|
* to the receive queue of a socket. If present,
|
|
* m0 must include a packet header with total length.
|
|
* Returns 0 if no space in sockbuf or insufficient mbufs.
|
|
*/
|
|
int
|
|
sbappendaddr_locked(sb, asa, m0, control)
|
|
struct sockbuf *sb;
|
|
const struct sockaddr *asa;
|
|
struct mbuf *m0, *control;
|
|
{
|
|
struct mbuf *m, *n, *nlast;
|
|
int space = asa->sa_len;
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
|
|
if (m0 && (m0->m_flags & M_PKTHDR) == 0)
|
|
panic("sbappendaddr_locked");
|
|
if (m0)
|
|
space += m0->m_pkthdr.len;
|
|
space += m_length(control, &n);
|
|
|
|
if (space > sbspace(sb))
|
|
return (0);
|
|
#if MSIZE <= 256
|
|
if (asa->sa_len > MLEN)
|
|
return (0);
|
|
#endif
|
|
MGET(m, M_DONTWAIT, MT_SONAME);
|
|
if (m == 0)
|
|
return (0);
|
|
m->m_len = asa->sa_len;
|
|
bcopy(asa, mtod(m, caddr_t), asa->sa_len);
|
|
if (n)
|
|
n->m_next = m0; /* concatenate data to control */
|
|
else
|
|
control = m0;
|
|
m->m_next = control;
|
|
for (n = m; n->m_next != NULL; n = n->m_next)
|
|
sballoc(sb, n);
|
|
sballoc(sb, n);
|
|
nlast = n;
|
|
SBLINKRECORD(sb, m);
|
|
|
|
sb->sb_mbtail = nlast;
|
|
SBLASTMBUFCHK(sb);
|
|
|
|
SBLASTRECORDCHK(sb);
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Append address and data, and optionally, control (ancillary) data
|
|
* to the receive queue of a socket. If present,
|
|
* m0 must include a packet header with total length.
|
|
* Returns 0 if no space in sockbuf or insufficient mbufs.
|
|
*/
|
|
int
|
|
sbappendaddr(sb, asa, m0, control)
|
|
struct sockbuf *sb;
|
|
const struct sockaddr *asa;
|
|
struct mbuf *m0, *control;
|
|
{
|
|
int retval;
|
|
|
|
SOCKBUF_LOCK(sb);
|
|
retval = sbappendaddr_locked(sb, asa, m0, control);
|
|
SOCKBUF_UNLOCK(sb);
|
|
return (retval);
|
|
}
|
|
|
|
int
|
|
sbappendcontrol_locked(sb, m0, control)
|
|
struct sockbuf *sb;
|
|
struct mbuf *control, *m0;
|
|
{
|
|
struct mbuf *m, *n, *mlast;
|
|
int space;
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
|
|
if (control == 0)
|
|
panic("sbappendcontrol_locked");
|
|
space = m_length(control, &n) + m_length(m0, NULL);
|
|
|
|
if (space > sbspace(sb))
|
|
return (0);
|
|
n->m_next = m0; /* concatenate data to control */
|
|
|
|
SBLASTRECORDCHK(sb);
|
|
|
|
for (m = control; m->m_next; m = m->m_next)
|
|
sballoc(sb, m);
|
|
sballoc(sb, m);
|
|
mlast = m;
|
|
SBLINKRECORD(sb, control);
|
|
|
|
sb->sb_mbtail = mlast;
|
|
SBLASTMBUFCHK(sb);
|
|
|
|
SBLASTRECORDCHK(sb);
|
|
return (1);
|
|
}
|
|
|
|
int
|
|
sbappendcontrol(sb, m0, control)
|
|
struct sockbuf *sb;
|
|
struct mbuf *control, *m0;
|
|
{
|
|
int retval;
|
|
|
|
SOCKBUF_LOCK(sb);
|
|
retval = sbappendcontrol_locked(sb, m0, control);
|
|
SOCKBUF_UNLOCK(sb);
|
|
return (retval);
|
|
}
|
|
|
|
/*
|
|
* Append the data in mbuf chain (m) into the socket buffer sb following mbuf
|
|
* (n). If (n) is NULL, the buffer is presumed empty.
|
|
*
|
|
* When the data is compressed, mbufs in the chain may be handled in one of
|
|
* three ways:
|
|
*
|
|
* (1) The mbuf may simply be dropped, if it contributes nothing (no data, no
|
|
* record boundary, and no change in data type).
|
|
*
|
|
* (2) The mbuf may be coalesced -- i.e., data in the mbuf may be copied into
|
|
* an mbuf already in the socket buffer. This can occur if an
|
|
* appropriate mbuf exists, there is room, and no merging of data types
|
|
* will occur.
|
|
*
|
|
* (3) The mbuf may be appended to the end of the existing mbuf chain.
|
|
*
|
|
* If any of the new mbufs is marked as M_EOR, mark the last mbuf appended as
|
|
* end-of-record.
|
|
*/
|
|
void
|
|
sbcompress(sb, m, n)
|
|
register struct sockbuf *sb;
|
|
register struct mbuf *m, *n;
|
|
{
|
|
register int eor = 0;
|
|
register struct mbuf *o;
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
|
|
while (m) {
|
|
eor |= m->m_flags & M_EOR;
|
|
if (m->m_len == 0 &&
|
|
(eor == 0 ||
|
|
(((o = m->m_next) || (o = n)) &&
|
|
o->m_type == m->m_type))) {
|
|
if (sb->sb_lastrecord == m)
|
|
sb->sb_lastrecord = m->m_next;
|
|
m = m_free(m);
|
|
continue;
|
|
}
|
|
if (n && (n->m_flags & M_EOR) == 0 &&
|
|
M_WRITABLE(n) &&
|
|
m->m_len <= MCLBYTES / 4 && /* XXX: Don't copy too much */
|
|
m->m_len <= M_TRAILINGSPACE(n) &&
|
|
n->m_type == m->m_type) {
|
|
bcopy(mtod(m, caddr_t), mtod(n, caddr_t) + n->m_len,
|
|
(unsigned)m->m_len);
|
|
n->m_len += m->m_len;
|
|
sb->sb_cc += m->m_len;
|
|
if (m->m_type != MT_DATA && m->m_type != MT_OOBDATA)
|
|
/* XXX: Probably don't need.*/
|
|
sb->sb_ctl += m->m_len;
|
|
m = m_free(m);
|
|
continue;
|
|
}
|
|
if (n)
|
|
n->m_next = m;
|
|
else
|
|
sb->sb_mb = m;
|
|
sb->sb_mbtail = m;
|
|
sballoc(sb, m);
|
|
n = m;
|
|
m->m_flags &= ~M_EOR;
|
|
m = m->m_next;
|
|
n->m_next = 0;
|
|
}
|
|
if (eor) {
|
|
KASSERT(n != NULL, ("sbcompress: eor && n == NULL"));
|
|
n->m_flags |= eor;
|
|
}
|
|
SBLASTMBUFCHK(sb);
|
|
}
|
|
|
|
/*
|
|
* Free all mbufs in a sockbuf.
|
|
* Check that all resources are reclaimed.
|
|
*/
|
|
void
|
|
sbflush_locked(sb)
|
|
register struct sockbuf *sb;
|
|
{
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
|
|
if (sb->sb_flags & SB_LOCK)
|
|
panic("sbflush_locked: locked");
|
|
while (sb->sb_mbcnt) {
|
|
/*
|
|
* Don't call sbdrop(sb, 0) if the leading mbuf is non-empty:
|
|
* we would loop forever. Panic instead.
|
|
*/
|
|
if (!sb->sb_cc && (sb->sb_mb == NULL || sb->sb_mb->m_len))
|
|
break;
|
|
sbdrop_locked(sb, (int)sb->sb_cc);
|
|
}
|
|
if (sb->sb_cc || sb->sb_mb || sb->sb_mbcnt)
|
|
panic("sbflush_locked: cc %u || mb %p || mbcnt %u", sb->sb_cc, (void *)sb->sb_mb, sb->sb_mbcnt);
|
|
}
|
|
|
|
void
|
|
sbflush(sb)
|
|
register struct sockbuf *sb;
|
|
{
|
|
|
|
SOCKBUF_LOCK(sb);
|
|
sbflush_locked(sb);
|
|
SOCKBUF_UNLOCK(sb);
|
|
}
|
|
|
|
/*
|
|
* Drop data from (the front of) a sockbuf.
|
|
*/
|
|
void
|
|
sbdrop_locked(sb, len)
|
|
register struct sockbuf *sb;
|
|
register int len;
|
|
{
|
|
register struct mbuf *m;
|
|
struct mbuf *next;
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
|
|
next = (m = sb->sb_mb) ? m->m_nextpkt : 0;
|
|
while (len > 0) {
|
|
if (m == 0) {
|
|
if (next == 0)
|
|
panic("sbdrop");
|
|
m = next;
|
|
next = m->m_nextpkt;
|
|
continue;
|
|
}
|
|
if (m->m_len > len) {
|
|
m->m_len -= len;
|
|
m->m_data += len;
|
|
sb->sb_cc -= len;
|
|
if (m->m_type != MT_DATA && m->m_type != MT_OOBDATA)
|
|
sb->sb_ctl -= len;
|
|
break;
|
|
}
|
|
len -= m->m_len;
|
|
sbfree(sb, m);
|
|
m = m_free(m);
|
|
}
|
|
while (m && m->m_len == 0) {
|
|
sbfree(sb, m);
|
|
m = m_free(m);
|
|
}
|
|
if (m) {
|
|
sb->sb_mb = m;
|
|
m->m_nextpkt = next;
|
|
} else
|
|
sb->sb_mb = next;
|
|
/*
|
|
* First part is an inline SB_EMPTY_FIXUP(). Second part
|
|
* makes sure sb_lastrecord is up-to-date if we dropped
|
|
* part of the last record.
|
|
*/
|
|
m = sb->sb_mb;
|
|
if (m == NULL) {
|
|
sb->sb_mbtail = NULL;
|
|
sb->sb_lastrecord = NULL;
|
|
} else if (m->m_nextpkt == NULL) {
|
|
sb->sb_lastrecord = m;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Drop data from (the front of) a sockbuf.
|
|
*/
|
|
void
|
|
sbdrop(sb, len)
|
|
register struct sockbuf *sb;
|
|
register int len;
|
|
{
|
|
|
|
SOCKBUF_LOCK(sb);
|
|
sbdrop_locked(sb, len);
|
|
SOCKBUF_UNLOCK(sb);
|
|
}
|
|
|
|
/*
|
|
* Drop a record off the front of a sockbuf
|
|
* and move the next record to the front.
|
|
*/
|
|
void
|
|
sbdroprecord_locked(sb)
|
|
register struct sockbuf *sb;
|
|
{
|
|
register struct mbuf *m;
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
|
|
m = sb->sb_mb;
|
|
if (m) {
|
|
sb->sb_mb = m->m_nextpkt;
|
|
do {
|
|
sbfree(sb, m);
|
|
m = m_free(m);
|
|
} while (m);
|
|
}
|
|
SB_EMPTY_FIXUP(sb);
|
|
}
|
|
|
|
/*
|
|
* Drop a record off the front of a sockbuf
|
|
* and move the next record to the front.
|
|
*/
|
|
void
|
|
sbdroprecord(sb)
|
|
register struct sockbuf *sb;
|
|
{
|
|
|
|
SOCKBUF_LOCK(sb);
|
|
sbdroprecord_locked(sb);
|
|
SOCKBUF_UNLOCK(sb);
|
|
}
|
|
|
|
/*
|
|
* Create a "control" mbuf containing the specified data
|
|
* with the specified type for presentation on a socket buffer.
|
|
*/
|
|
struct mbuf *
|
|
sbcreatecontrol(p, size, type, level)
|
|
caddr_t p;
|
|
register int size;
|
|
int type, level;
|
|
{
|
|
register struct cmsghdr *cp;
|
|
struct mbuf *m;
|
|
|
|
if (CMSG_SPACE((u_int)size) > MCLBYTES)
|
|
return ((struct mbuf *) NULL);
|
|
if (CMSG_SPACE((u_int)size) > MLEN)
|
|
m = m_getcl(M_DONTWAIT, MT_CONTROL, 0);
|
|
else
|
|
m = m_get(M_DONTWAIT, MT_CONTROL);
|
|
if (m == NULL)
|
|
return ((struct mbuf *) NULL);
|
|
cp = mtod(m, struct cmsghdr *);
|
|
m->m_len = 0;
|
|
KASSERT(CMSG_SPACE((u_int)size) <= M_TRAILINGSPACE(m),
|
|
("sbcreatecontrol: short mbuf"));
|
|
if (p != NULL)
|
|
(void)memcpy(CMSG_DATA(cp), p, size);
|
|
m->m_len = CMSG_SPACE(size);
|
|
cp->cmsg_len = CMSG_LEN(size);
|
|
cp->cmsg_level = level;
|
|
cp->cmsg_type = type;
|
|
return (m);
|
|
}
|
|
|
|
/*
|
|
* Some routines that return EOPNOTSUPP for entry points that are not
|
|
* supported by a protocol. Fill in as needed.
|
|
*/
|
|
void
|
|
pru_abort_notsupp(struct socket *so)
|
|
{
|
|
|
|
}
|
|
|
|
int
|
|
pru_accept_notsupp(struct socket *so, struct sockaddr **nam)
|
|
{
|
|
return EOPNOTSUPP;
|
|
}
|
|
|
|
int
|
|
pru_attach_notsupp(struct socket *so, int proto, struct thread *td)
|
|
{
|
|
return EOPNOTSUPP;
|
|
}
|
|
|
|
int
|
|
pru_bind_notsupp(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
return EOPNOTSUPP;
|
|
}
|
|
|
|
int
|
|
pru_connect_notsupp(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
return EOPNOTSUPP;
|
|
}
|
|
|
|
int
|
|
pru_connect2_notsupp(struct socket *so1, struct socket *so2)
|
|
{
|
|
return EOPNOTSUPP;
|
|
}
|
|
|
|
int
|
|
pru_control_notsupp(struct socket *so, u_long cmd, caddr_t data,
|
|
struct ifnet *ifp, struct thread *td)
|
|
{
|
|
return EOPNOTSUPP;
|
|
}
|
|
|
|
void
|
|
pru_detach_notsupp(struct socket *so)
|
|
{
|
|
|
|
}
|
|
|
|
int
|
|
pru_disconnect_notsupp(struct socket *so)
|
|
{
|
|
return EOPNOTSUPP;
|
|
}
|
|
|
|
int
|
|
pru_listen_notsupp(struct socket *so, int backlog, struct thread *td)
|
|
{
|
|
return EOPNOTSUPP;
|
|
}
|
|
|
|
int
|
|
pru_peeraddr_notsupp(struct socket *so, struct sockaddr **nam)
|
|
{
|
|
return EOPNOTSUPP;
|
|
}
|
|
|
|
int
|
|
pru_rcvd_notsupp(struct socket *so, int flags)
|
|
{
|
|
return EOPNOTSUPP;
|
|
}
|
|
|
|
int
|
|
pru_rcvoob_notsupp(struct socket *so, struct mbuf *m, int flags)
|
|
{
|
|
return EOPNOTSUPP;
|
|
}
|
|
|
|
int
|
|
pru_send_notsupp(struct socket *so, int flags, struct mbuf *m,
|
|
struct sockaddr *addr, struct mbuf *control, struct thread *td)
|
|
{
|
|
return EOPNOTSUPP;
|
|
}
|
|
|
|
/*
|
|
* This isn't really a ``null'' operation, but it's the default one
|
|
* and doesn't do anything destructive.
|
|
*/
|
|
int
|
|
pru_sense_null(struct socket *so, struct stat *sb)
|
|
{
|
|
sb->st_blksize = so->so_snd.sb_hiwat;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
pru_shutdown_notsupp(struct socket *so)
|
|
{
|
|
return EOPNOTSUPP;
|
|
}
|
|
|
|
int
|
|
pru_sockaddr_notsupp(struct socket *so, struct sockaddr **nam)
|
|
{
|
|
return EOPNOTSUPP;
|
|
}
|
|
|
|
int
|
|
pru_sosend_notsupp(struct socket *so, struct sockaddr *addr, struct uio *uio,
|
|
struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
|
|
{
|
|
return EOPNOTSUPP;
|
|
}
|
|
|
|
int
|
|
pru_soreceive_notsupp(struct socket *so, struct sockaddr **paddr,
|
|
struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
|
|
int *flagsp)
|
|
{
|
|
return EOPNOTSUPP;
|
|
}
|
|
|
|
int
|
|
pru_sopoll_notsupp(struct socket *so, int events, struct ucred *cred,
|
|
struct thread *td)
|
|
{
|
|
return EOPNOTSUPP;
|
|
}
|
|
|
|
/*
|
|
* For protocol types that don't keep cached copies of labels in their
|
|
* pcbs, provide a null sosetlabel that does a NOOP.
|
|
*/
|
|
void
|
|
pru_sosetlabel_null(struct socket *so)
|
|
{
|
|
|
|
}
|
|
|
|
/*
|
|
* Make a copy of a sockaddr in a malloced buffer of type M_SONAME.
|
|
*/
|
|
struct sockaddr *
|
|
sodupsockaddr(const struct sockaddr *sa, int mflags)
|
|
{
|
|
struct sockaddr *sa2;
|
|
|
|
sa2 = malloc(sa->sa_len, M_SONAME, mflags);
|
|
if (sa2)
|
|
bcopy(sa, sa2, sa->sa_len);
|
|
return sa2;
|
|
}
|
|
|
|
/*
|
|
* Create an external-format (``xsocket'') structure using the information
|
|
* in the kernel-format socket structure pointed to by so. This is done
|
|
* to reduce the spew of irrelevant information over this interface,
|
|
* to isolate user code from changes in the kernel structure, and
|
|
* potentially to provide information-hiding if we decide that
|
|
* some of this information should be hidden from users.
|
|
*/
|
|
void
|
|
sotoxsocket(struct socket *so, struct xsocket *xso)
|
|
{
|
|
xso->xso_len = sizeof *xso;
|
|
xso->xso_so = so;
|
|
xso->so_type = so->so_type;
|
|
xso->so_options = so->so_options;
|
|
xso->so_linger = so->so_linger;
|
|
xso->so_state = so->so_state;
|
|
xso->so_pcb = so->so_pcb;
|
|
xso->xso_protocol = so->so_proto->pr_protocol;
|
|
xso->xso_family = so->so_proto->pr_domain->dom_family;
|
|
xso->so_qlen = so->so_qlen;
|
|
xso->so_incqlen = so->so_incqlen;
|
|
xso->so_qlimit = so->so_qlimit;
|
|
xso->so_timeo = so->so_timeo;
|
|
xso->so_error = so->so_error;
|
|
xso->so_pgid = so->so_sigio ? so->so_sigio->sio_pgid : 0;
|
|
xso->so_oobmark = so->so_oobmark;
|
|
sbtoxsockbuf(&so->so_snd, &xso->so_snd);
|
|
sbtoxsockbuf(&so->so_rcv, &xso->so_rcv);
|
|
xso->so_uid = so->so_cred->cr_uid;
|
|
}
|
|
|
|
/*
|
|
* This does the same for sockbufs. Note that the xsockbuf structure,
|
|
* since it is always embedded in a socket, does not include a self
|
|
* pointer nor a length. We make this entry point public in case
|
|
* some other mechanism needs it.
|
|
*/
|
|
void
|
|
sbtoxsockbuf(struct sockbuf *sb, struct xsockbuf *xsb)
|
|
{
|
|
xsb->sb_cc = sb->sb_cc;
|
|
xsb->sb_hiwat = sb->sb_hiwat;
|
|
xsb->sb_mbcnt = sb->sb_mbcnt;
|
|
xsb->sb_mbmax = sb->sb_mbmax;
|
|
xsb->sb_lowat = sb->sb_lowat;
|
|
xsb->sb_flags = sb->sb_flags;
|
|
xsb->sb_timeo = sb->sb_timeo;
|
|
}
|
|
|
|
/*
|
|
* Here is the definition of some of the basic objects in the kern.ipc
|
|
* branch of the MIB.
|
|
*/
|
|
SYSCTL_NODE(_kern, KERN_IPC, ipc, CTLFLAG_RW, 0, "IPC");
|
|
|
|
/* This takes the place of kern.maxsockbuf, which moved to kern.ipc. */
|
|
static int dummy;
|
|
SYSCTL_INT(_kern, KERN_DUMMY, dummy, CTLFLAG_RW, &dummy, 0, "");
|
|
SYSCTL_OID(_kern_ipc, KIPC_MAXSOCKBUF, maxsockbuf, CTLTYPE_ULONG|CTLFLAG_RW,
|
|
&sb_max, 0, sysctl_handle_sb_max, "LU", "Maximum socket buffer size");
|
|
SYSCTL_INT(_kern_ipc, OID_AUTO, maxsockets, CTLFLAG_RDTUN,
|
|
&maxsockets, 0, "Maximum number of sockets avaliable");
|
|
SYSCTL_ULONG(_kern_ipc, KIPC_SOCKBUF_WASTE, sockbuf_waste_factor, CTLFLAG_RW,
|
|
&sb_efficiency, 0, "");
|
|
|
|
/*
|
|
* Initialise maxsockets
|
|
*/
|
|
static void init_maxsockets(void *ignored)
|
|
{
|
|
TUNABLE_INT_FETCH("kern.ipc.maxsockets", &maxsockets);
|
|
maxsockets = imax(maxsockets, imax(maxfiles, nmbclusters));
|
|
}
|
|
SYSINIT(param, SI_SUB_TUNABLES, SI_ORDER_ANY, init_maxsockets, NULL);
|