4ad1c464fe
chains) to pure data mbufs using m_demote(). This removes the packet header and all m_tag information as they are not meaningful anymore on a stream socket where mbufs are linked through m->m_next. Strictly speaking a packet header can be only ever valid on the first mbuf in an m_next chain. sbcompress() was doing this already when the mbuf chain layout lent itself to it (e.g. header splitting or merge-append), just not consistently. This frees resources at socket buffer append time instead of at sbdrop_internal() time after data has been read from the socket. For MAC the per packet information has done its duty and during socket buffer appending the policy of the socket itself takes over. With the append the packet boundaries disappear naturally and with it any context that was based on it. None of the residual information from mbuf headers in the socket buffer on stream sockets was looked at.
1055 lines
26 KiB
C
1055 lines
26 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_param.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/aio.h> /* for aio_swake proto */
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/protosw.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/signalvar.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/socketvar.h>
|
|
#include <sys/sx.h>
|
|
#include <sys/sysctl.h>
|
|
|
|
/*
|
|
* Function pointer set by the AIO routines so that the socket buffer code
|
|
* can call back into the AIO module if it is loaded.
|
|
*/
|
|
void (*aio_swake)(struct socket *, struct sockbuf *);
|
|
|
|
/*
|
|
* Primitive routines for operating on socket buffers
|
|
*/
|
|
|
|
u_long sb_max = SB_MAX;
|
|
u_long sb_max_adj =
|
|
SB_MAX * MCLBYTES / (MSIZE + MCLBYTES); /* adjusted sb_max */
|
|
|
|
static u_long sb_efficiency = 8; /* parameter for sbreserve() */
|
|
|
|
static void sbdrop_internal(struct sockbuf *sb, int len);
|
|
static void sbflush_internal(struct sockbuf *sb);
|
|
|
|
/*
|
|
* 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(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(struct socket *so)
|
|
{
|
|
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
socantsendmore_locked(so);
|
|
mtx_assert(SOCKBUF_MTX(&so->so_snd), MA_NOTOWNED);
|
|
}
|
|
|
|
void
|
|
socantrcvmore_locked(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(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(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));
|
|
}
|
|
|
|
int
|
|
sblock(struct sockbuf *sb, int flags)
|
|
{
|
|
|
|
KASSERT((flags & SBL_VALID) == flags,
|
|
("sblock: flags invalid (0x%x)", flags));
|
|
|
|
if (flags & SBL_WAIT) {
|
|
if ((sb->sb_flags & SB_NOINTR) ||
|
|
(flags & SBL_NOINTR)) {
|
|
sx_xlock(&sb->sb_sx);
|
|
return (0);
|
|
}
|
|
return (sx_xlock_sig(&sb->sb_sx));
|
|
} else {
|
|
if (sx_try_xlock(&sb->sb_sx) == 0)
|
|
return (EWOULDBLOCK);
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
void
|
|
sbunlock(struct sockbuf *sb)
|
|
{
|
|
|
|
sx_xunlock(&sb->sb_sx);
|
|
}
|
|
|
|
/*
|
|
* 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(struct socket *so, struct sockbuf *sb)
|
|
{
|
|
int ret;
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
|
|
selwakeuppri(&sb->sb_sel, PSOCK);
|
|
if (!SEL_WAITING(&sb->sb_sel))
|
|
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);
|
|
if (sb->sb_upcall != NULL) {
|
|
ret = sb->sb_upcall(so, sb->sb_upcallarg, M_DONTWAIT);
|
|
if (ret == SU_ISCONNECTED) {
|
|
KASSERT(sb == &so->so_rcv,
|
|
("SO_SND upcall returned SU_ISCONNECTED"));
|
|
soupcall_clear(so, SO_RCV);
|
|
}
|
|
} else
|
|
ret = SU_OK;
|
|
if (sb->sb_flags & SB_AIO)
|
|
aio_swake(so, sb);
|
|
SOCKBUF_UNLOCK(sb);
|
|
if (ret == SU_ISCONNECTED)
|
|
soisconnected(so);
|
|
if ((so->so_state & SS_ASYNC) && so->so_sigio != NULL)
|
|
pgsigio(&so->so_sigio, SIGIO, 0);
|
|
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(struct socket *so, u_long sndcc, u_long 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 tmp_sb_max = sb_max;
|
|
|
|
error = sysctl_handle_long(oidp, &tmp_sb_max, arg2, req);
|
|
if (error || !req->newptr)
|
|
return (error);
|
|
if (tmp_sb_max < MSIZE + MCLBYTES)
|
|
return (EINVAL);
|
|
sb_max = tmp_sb_max;
|
|
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(struct sockbuf *sb, u_long cc, struct socket *so,
|
|
struct thread *td)
|
|
{
|
|
rlim_t sbsize_limit;
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
|
|
/*
|
|
* When a thread is passed, we take into account the thread's socket
|
|
* buffer size limit. The caller will generally pass curthread, but
|
|
* in the TCP input path, NULL will be passed to indicate that no
|
|
* appropriate thread resource limits are available. In that case,
|
|
* we don't apply a process limit.
|
|
*/
|
|
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(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_internal(struct sockbuf *sb, struct socket *so)
|
|
{
|
|
|
|
sbflush_internal(sb);
|
|
(void)chgsbsize(so->so_cred->cr_uidinfo, &sb->sb_hiwat, 0,
|
|
RLIM_INFINITY);
|
|
sb->sb_mbmax = 0;
|
|
}
|
|
|
|
void
|
|
sbrelease_locked(struct sockbuf *sb, struct socket *so)
|
|
{
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
|
|
sbrelease_internal(sb, so);
|
|
}
|
|
|
|
void
|
|
sbrelease(struct sockbuf *sb, struct socket *so)
|
|
{
|
|
|
|
SOCKBUF_LOCK(sb);
|
|
sbrelease_locked(sb, so);
|
|
SOCKBUF_UNLOCK(sb);
|
|
}
|
|
|
|
void
|
|
sbdestroy(struct sockbuf *sb, struct socket *so)
|
|
{
|
|
|
|
sbrelease_internal(sb, so);
|
|
}
|
|
|
|
/*
|
|
* 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(struct sockbuf *sb, struct mbuf *m)
|
|
{
|
|
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(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);
|
|
|
|
/* Remove all packet headers and mbuf tags to get a pure data chain. */
|
|
m_demote(m, 1);
|
|
|
|
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(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(struct sockbuf *sb, struct mbuf *m0)
|
|
{
|
|
struct mbuf *m;
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
|
|
if (m0 == 0)
|
|
return;
|
|
/*
|
|
* Put the first mbuf on the queue. Note this permits zero length
|
|
* records.
|
|
*/
|
|
sballoc(sb, m0);
|
|
SBLASTRECORDCHK(sb);
|
|
SBLINKRECORD(sb, m0);
|
|
sb->sb_mbtail = 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;
|
|
}
|
|
/* always call sbcompress() so it can do SBLASTMBUFCHK() */
|
|
sbcompress(sb, m, m0);
|
|
}
|
|
|
|
/*
|
|
* As above, except the mbuf chain begins a new record.
|
|
*/
|
|
void
|
|
sbappendrecord(struct sockbuf *sb, struct mbuf *m0)
|
|
{
|
|
|
|
SOCKBUF_LOCK(sb);
|
|
sbappendrecord_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(struct sockbuf *sb, const struct sockaddr *asa,
|
|
struct mbuf *m0, struct mbuf *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(struct sockbuf *sb, const struct sockaddr *asa,
|
|
struct mbuf *m0, struct mbuf *control)
|
|
{
|
|
int retval;
|
|
|
|
SOCKBUF_LOCK(sb);
|
|
retval = sbappendaddr_locked(sb, asa, m0, control);
|
|
SOCKBUF_UNLOCK(sb);
|
|
return (retval);
|
|
}
|
|
|
|
int
|
|
sbappendcontrol_locked(struct sockbuf *sb, struct mbuf *m0,
|
|
struct mbuf *control)
|
|
{
|
|
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(struct sockbuf *sb, struct mbuf *m0, struct mbuf *control)
|
|
{
|
|
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(struct sockbuf *sb, struct mbuf *m, struct mbuf *n)
|
|
{
|
|
int eor = 0;
|
|
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) &&
|
|
((sb->sb_flags & SB_NOCOALESCE) == 0) &&
|
|
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.
|
|
*/
|
|
static void
|
|
sbflush_internal(struct sockbuf *sb)
|
|
{
|
|
|
|
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_internal(sb, (int)sb->sb_cc);
|
|
}
|
|
if (sb->sb_cc || sb->sb_mb || sb->sb_mbcnt)
|
|
panic("sbflush_internal: cc %u || mb %p || mbcnt %u",
|
|
sb->sb_cc, (void *)sb->sb_mb, sb->sb_mbcnt);
|
|
}
|
|
|
|
void
|
|
sbflush_locked(struct sockbuf *sb)
|
|
{
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
sbflush_internal(sb);
|
|
}
|
|
|
|
void
|
|
sbflush(struct sockbuf *sb)
|
|
{
|
|
|
|
SOCKBUF_LOCK(sb);
|
|
sbflush_locked(sb);
|
|
SOCKBUF_UNLOCK(sb);
|
|
}
|
|
|
|
/*
|
|
* Drop data from (the front of) a sockbuf.
|
|
*/
|
|
static void
|
|
sbdrop_internal(struct sockbuf *sb, int len)
|
|
{
|
|
struct mbuf *m;
|
|
struct mbuf *next;
|
|
|
|
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 (sb->sb_sndptroff != 0)
|
|
sb->sb_sndptroff -= 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_locked(struct sockbuf *sb, int len)
|
|
{
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
|
|
sbdrop_internal(sb, len);
|
|
}
|
|
|
|
void
|
|
sbdrop(struct sockbuf *sb, int len)
|
|
{
|
|
|
|
SOCKBUF_LOCK(sb);
|
|
sbdrop_locked(sb, len);
|
|
SOCKBUF_UNLOCK(sb);
|
|
}
|
|
|
|
/*
|
|
* Maintain a pointer and offset pair into the socket buffer mbuf chain to
|
|
* avoid traversal of the entire socket buffer for larger offsets.
|
|
*/
|
|
struct mbuf *
|
|
sbsndptr(struct sockbuf *sb, u_int off, u_int len, u_int *moff)
|
|
{
|
|
struct mbuf *m, *ret;
|
|
|
|
KASSERT(sb->sb_mb != NULL, ("%s: sb_mb is NULL", __func__));
|
|
KASSERT(off + len <= sb->sb_cc, ("%s: beyond sb", __func__));
|
|
KASSERT(sb->sb_sndptroff <= sb->sb_cc, ("%s: sndptroff broken", __func__));
|
|
|
|
/*
|
|
* Is off below stored offset? Happens on retransmits.
|
|
* Just return, we can't help here.
|
|
*/
|
|
if (sb->sb_sndptroff > off) {
|
|
*moff = off;
|
|
return (sb->sb_mb);
|
|
}
|
|
|
|
/* Return closest mbuf in chain for current offset. */
|
|
*moff = off - sb->sb_sndptroff;
|
|
m = ret = sb->sb_sndptr ? sb->sb_sndptr : sb->sb_mb;
|
|
|
|
/* Advance by len to be as close as possible for the next transmit. */
|
|
for (off = off - sb->sb_sndptroff + len - 1;
|
|
off > 0 && m != NULL && off >= m->m_len;
|
|
m = m->m_next) {
|
|
sb->sb_sndptroff += m->m_len;
|
|
off -= m->m_len;
|
|
}
|
|
if (off > 0 && m == NULL)
|
|
panic("%s: sockbuf %p and mbuf %p clashing", __func__, sb, ret);
|
|
sb->sb_sndptr = m;
|
|
|
|
return (ret);
|
|
}
|
|
|
|
/*
|
|
* Drop a record off the front of a sockbuf and move the next record to the
|
|
* front.
|
|
*/
|
|
void
|
|
sbdroprecord_locked(struct sockbuf *sb)
|
|
{
|
|
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(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(caddr_t p, int size, int type, int level)
|
|
{
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* This does the same for socket buffers that sotoxsocket does for sockets:
|
|
* generate an user-format data structure describing the socket buffer. 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_mcnt = sb->sb_mcnt;
|
|
xsb->sb_ccnt = sb->sb_ccnt;
|
|
xsb->sb_mbmax = sb->sb_mbmax;
|
|
xsb->sb_lowat = sb->sb_lowat;
|
|
xsb->sb_flags = sb->sb_flags;
|
|
xsb->sb_timeo = sb->sb_timeo;
|
|
}
|
|
|
|
/* 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_ULONG(_kern_ipc, KIPC_SOCKBUF_WASTE, sockbuf_waste_factor, CTLFLAG_RW,
|
|
&sb_efficiency, 0, "");
|