79cb7eb41c
of the adjusted sb_max into a sysctl handler for sb_max and assigning it to a variable that is used instead. This eliminates the 32bit multiply and divide from the fast path that was being done previously.
1012 lines
26 KiB
C
1012 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 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
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#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>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/signalvar.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/socketvar.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/systm.h>
|
|
|
|
int maxsockets;
|
|
|
|
void (*aio_swake)(struct socket *, struct sockbuf *);
|
|
|
|
/*
|
|
* Primitive routines for operating on sockets and 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() */
|
|
|
|
/*
|
|
* 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;
|
|
{
|
|
|
|
so->so_state &= ~(SS_ISCONNECTED|SS_ISDISCONNECTING);
|
|
so->so_state |= SS_ISCONNECTING;
|
|
}
|
|
|
|
void
|
|
soisconnected(so)
|
|
struct socket *so;
|
|
{
|
|
struct socket *head = so->so_head;
|
|
|
|
so->so_state &= ~(SS_ISCONNECTING|SS_ISDISCONNECTING|SS_ISCONFIRMING);
|
|
so->so_state |= SS_ISCONNECTED;
|
|
if (head && (so->so_state & SS_INCOMP)) {
|
|
if ((so->so_options & SO_ACCEPTFILTER) != 0) {
|
|
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;
|
|
so->so_upcall(so, so->so_upcallarg, 0);
|
|
return;
|
|
}
|
|
TAILQ_REMOVE(&head->so_incomp, so, so_list);
|
|
head->so_incqlen--;
|
|
so->so_state &= ~SS_INCOMP;
|
|
TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
|
|
head->so_qlen++;
|
|
so->so_state |= SS_COMP;
|
|
sorwakeup(head);
|
|
wakeup_one(&head->so_timeo);
|
|
} else {
|
|
wakeup(&so->so_timeo);
|
|
sorwakeup(so);
|
|
sowwakeup(so);
|
|
}
|
|
}
|
|
|
|
void
|
|
soisdisconnecting(so)
|
|
register struct socket *so;
|
|
{
|
|
|
|
so->so_state &= ~SS_ISCONNECTING;
|
|
so->so_state |= (SS_ISDISCONNECTING|SS_CANTRCVMORE|SS_CANTSENDMORE);
|
|
wakeup(&so->so_timeo);
|
|
sowwakeup(so);
|
|
sorwakeup(so);
|
|
}
|
|
|
|
void
|
|
soisdisconnected(so)
|
|
register struct socket *so;
|
|
{
|
|
|
|
so->so_state &= ~(SS_ISCONNECTING|SS_ISCONNECTED|SS_ISDISCONNECTING);
|
|
so->so_state |= (SS_CANTRCVMORE|SS_CANTSENDMORE|SS_ISDISCONNECTED);
|
|
wakeup(&so->so_timeo);
|
|
sbdrop(&so->so_snd, so->so_snd.sb_cc);
|
|
sowwakeup(so);
|
|
sorwakeup(so);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
if (head->so_qlen > 3 * head->so_qlimit / 2)
|
|
return ((struct socket *)0);
|
|
so = soalloc(0);
|
|
if (so == NULL)
|
|
return ((struct socket *)0);
|
|
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
|
|
mac_create_socket_from_socket(head, so);
|
|
#endif
|
|
if (soreserve(so, head->so_snd.sb_hiwat, head->so_rcv.sb_hiwat) ||
|
|
(*so->so_proto->pr_usrreqs->pru_attach)(so, 0, NULL)) {
|
|
sotryfree(so);
|
|
return ((struct socket *)0);
|
|
}
|
|
|
|
if (connstatus) {
|
|
TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
|
|
so->so_state |= SS_COMP;
|
|
head->so_qlen++;
|
|
} else {
|
|
if (head->so_incqlen > head->so_qlimit) {
|
|
struct socket *sp;
|
|
sp = TAILQ_FIRST(&head->so_incomp);
|
|
(void) soabort(sp);
|
|
}
|
|
TAILQ_INSERT_TAIL(&head->so_incomp, so, so_list);
|
|
so->so_state |= SS_INCOMP;
|
|
head->so_incqlen++;
|
|
}
|
|
if (connstatus) {
|
|
sorwakeup(head);
|
|
wakeup(&head->so_timeo);
|
|
so->so_state |= connstatus;
|
|
}
|
|
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(so)
|
|
struct socket *so;
|
|
{
|
|
|
|
so->so_state |= SS_CANTSENDMORE;
|
|
sowwakeup(so);
|
|
}
|
|
|
|
void
|
|
socantrcvmore(so)
|
|
struct socket *so;
|
|
{
|
|
|
|
so->so_state |= SS_CANTRCVMORE;
|
|
sorwakeup(so);
|
|
}
|
|
|
|
/*
|
|
* Wait for data to arrive at/drain from a socket buffer.
|
|
*/
|
|
int
|
|
sbwait(sb)
|
|
struct sockbuf *sb;
|
|
{
|
|
|
|
sb->sb_flags |= SB_WAIT;
|
|
return (tsleep(&sb->sb_cc,
|
|
(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;
|
|
|
|
while (sb->sb_flags & SB_LOCK) {
|
|
sb->sb_flags |= SB_WANT;
|
|
error = tsleep(&sb->sb_flags,
|
|
(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.
|
|
*/
|
|
void
|
|
sowakeup(so, sb)
|
|
register struct socket *so;
|
|
register struct sockbuf *sb;
|
|
{
|
|
|
|
selwakeup(&sb->sb_sel);
|
|
sb->sb_flags &= ~SB_SEL;
|
|
if (sb->sb_flags & SB_WAIT) {
|
|
sb->sb_flags &= ~SB_WAIT;
|
|
wakeup(&sb->sb_cc);
|
|
}
|
|
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);
|
|
KNOTE(&sb->sb_sel.si_note, 0);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
if (sbreserve(&so->so_snd, sndcc, so, td) == 0)
|
|
goto bad;
|
|
if (sbreserve(&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;
|
|
return (0);
|
|
bad2:
|
|
sbrelease(&so->so_snd, so);
|
|
bad:
|
|
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(int));
|
|
if (error || !req->newptr)
|
|
return (error);
|
|
error = SYSCTL_IN(req, arg1, sizeof(int));
|
|
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(sb, cc, so, td)
|
|
struct sockbuf *sb;
|
|
u_long cc;
|
|
struct socket *so;
|
|
struct thread *td;
|
|
{
|
|
|
|
/*
|
|
* td will only be NULL when we're in an interrupt
|
|
* (e.g. in tcp_input())
|
|
*/
|
|
if (cc > sb_max_adj)
|
|
return (0);
|
|
if (!chgsbsize(so->so_cred->cr_uidinfo, &sb->sb_hiwat, cc,
|
|
td ? td->td_proc->p_rlimit[RLIMIT_SBSIZE].rlim_cur : RLIM_INFINITY)) {
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* Free mbufs held by a socket, and reserved mbuf space.
|
|
*/
|
|
void
|
|
sbrelease(sb, so)
|
|
struct sockbuf *sb;
|
|
struct socket *so;
|
|
{
|
|
|
|
sbflush(sb);
|
|
(void)chgsbsize(so->so_cred->cr_uidinfo, &sb->sb_hiwat, 0,
|
|
RLIM_INFINITY);
|
|
sb->sb_mbmax = 0;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* 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;
|
|
{
|
|
register struct mbuf *n;
|
|
|
|
if (m == 0)
|
|
return;
|
|
n = sb->sb_mb;
|
|
if (n) {
|
|
while (n->m_nextpkt)
|
|
n = n->m_nextpkt;
|
|
do {
|
|
if (n->m_flags & M_EOR) {
|
|
sbappendrecord(sb, m); /* XXXXXX!!!! */
|
|
return;
|
|
}
|
|
} while (n->m_next && (n = n->m_next));
|
|
}
|
|
sbcompress(sb, m, n);
|
|
}
|
|
|
|
#ifdef SOCKBUF_DEBUG
|
|
void
|
|
sbcheck(sb)
|
|
register struct sockbuf *sb;
|
|
{
|
|
register struct mbuf *m;
|
|
register struct mbuf *n = 0;
|
|
register u_long len = 0, mbcnt = 0;
|
|
|
|
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 != %ld || mbcnt %ld != %ld\n", len, sb->sb_cc,
|
|
mbcnt, sb->sb_mbcnt);
|
|
panic("sbcheck");
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* As above, except the mbuf chain
|
|
* begins a new record.
|
|
*/
|
|
void
|
|
sbappendrecord(sb, m0)
|
|
register struct sockbuf *sb;
|
|
register struct mbuf *m0;
|
|
{
|
|
register struct mbuf *m;
|
|
|
|
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);
|
|
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 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;
|
|
{
|
|
register struct mbuf *m;
|
|
register struct mbuf **mp;
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
register struct sockbuf *sb;
|
|
struct sockaddr *asa;
|
|
struct mbuf *m0, *control;
|
|
{
|
|
register struct mbuf *m, *n;
|
|
int space = asa->sa_len;
|
|
|
|
if (m0 && (m0->m_flags & M_PKTHDR) == 0)
|
|
panic("sbappendaddr");
|
|
if (m0)
|
|
space += m0->m_pkthdr.len;
|
|
for (n = control; n; n = n->m_next) {
|
|
space += n->m_len;
|
|
if (n->m_next == 0) /* keep pointer to last control buf */
|
|
break;
|
|
}
|
|
if (space > sbspace(sb))
|
|
return (0);
|
|
if (asa->sa_len > MLEN)
|
|
return (0);
|
|
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; n = n->m_next)
|
|
sballoc(sb, n);
|
|
n = sb->sb_mb;
|
|
if (n) {
|
|
while (n->m_nextpkt)
|
|
n = n->m_nextpkt;
|
|
n->m_nextpkt = m;
|
|
} else
|
|
sb->sb_mb = m;
|
|
return (1);
|
|
}
|
|
|
|
int
|
|
sbappendcontrol(sb, m0, control)
|
|
struct sockbuf *sb;
|
|
struct mbuf *control, *m0;
|
|
{
|
|
register struct mbuf *m, *n;
|
|
int space = 0;
|
|
|
|
if (control == 0)
|
|
panic("sbappendcontrol");
|
|
for (m = control; ; m = m->m_next) {
|
|
space += m->m_len;
|
|
if (m->m_next == 0)
|
|
break;
|
|
}
|
|
n = m; /* save pointer to last control buffer */
|
|
for (m = m0; m; m = m->m_next)
|
|
space += m->m_len;
|
|
if (space > sbspace(sb))
|
|
return (0);
|
|
n->m_next = m0; /* concatenate data to control */
|
|
for (m = control; m; m = m->m_next)
|
|
sballoc(sb, m);
|
|
n = sb->sb_mb;
|
|
if (n) {
|
|
while (n->m_nextpkt)
|
|
n = n->m_nextpkt;
|
|
n->m_nextpkt = control;
|
|
} else
|
|
sb->sb_mb = control;
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Compress mbuf chain m into the socket
|
|
* buffer sb following mbuf n. If n
|
|
* is null, the buffer is presumed empty.
|
|
*/
|
|
void
|
|
sbcompress(sb, m, n)
|
|
register struct sockbuf *sb;
|
|
register struct mbuf *m, *n;
|
|
{
|
|
register int eor = 0;
|
|
register struct mbuf *o;
|
|
|
|
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))) {
|
|
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;
|
|
m = m_free(m);
|
|
continue;
|
|
}
|
|
if (n)
|
|
n->m_next = m;
|
|
else
|
|
sb->sb_mb = m;
|
|
sballoc(sb, m);
|
|
n = m;
|
|
m->m_flags &= ~M_EOR;
|
|
m = m->m_next;
|
|
n->m_next = 0;
|
|
}
|
|
if (eor) {
|
|
if (n)
|
|
n->m_flags |= eor;
|
|
else
|
|
printf("semi-panic: sbcompress\n");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Free all mbufs in a sockbuf.
|
|
* Check that all resources are reclaimed.
|
|
*/
|
|
void
|
|
sbflush(sb)
|
|
register struct sockbuf *sb;
|
|
{
|
|
|
|
if (sb->sb_flags & SB_LOCK)
|
|
panic("sbflush: 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(sb, (int)sb->sb_cc);
|
|
}
|
|
if (sb->sb_cc || sb->sb_mb || sb->sb_mbcnt)
|
|
panic("sbflush: cc %u || mb %p || mbcnt %u", sb->sb_cc, (void *)sb->sb_mb, sb->sb_mbcnt);
|
|
}
|
|
|
|
/*
|
|
* Drop data from (the front of) a sockbuf.
|
|
*/
|
|
void
|
|
sbdrop(sb, len)
|
|
register struct sockbuf *sb;
|
|
register int len;
|
|
{
|
|
register 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;
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Drop a record off the front of a sockbuf
|
|
* and move the next record to the front.
|
|
*/
|
|
void
|
|
sbdroprecord(sb)
|
|
register struct sockbuf *sb;
|
|
{
|
|
register struct mbuf *m;
|
|
|
|
m = sb->sb_mb;
|
|
if (m) {
|
|
sb->sb_mb = m->m_nextpkt;
|
|
do {
|
|
sbfree(sb, m);
|
|
m = m_free(m);
|
|
} while (m);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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 ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL)
|
|
return ((struct mbuf *) NULL);
|
|
if (CMSG_SPACE((u_int)size) > MLEN) {
|
|
MCLGET(m, M_DONTWAIT);
|
|
if ((m->m_flags & M_EXT) == 0) {
|
|
m_free(m);
|
|
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.
|
|
*/
|
|
int
|
|
pru_accept_notsupp(struct socket *so, struct sockaddr **nam)
|
|
{
|
|
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;
|
|
}
|
|
|
|
int
|
|
pru_listen_notsupp(struct socket *so, struct thread *td)
|
|
{
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
/*
|
|
* Make a copy of a sockaddr in a malloced buffer of type M_SONAME.
|
|
*/
|
|
struct sockaddr *
|
|
dup_sockaddr(sa, canwait)
|
|
struct sockaddr *sa;
|
|
int canwait;
|
|
{
|
|
struct sockaddr *sa2;
|
|
|
|
MALLOC(sa2, struct sockaddr *, sa->sa_len, M_SONAME,
|
|
canwait ? M_WAITOK : M_NOWAIT);
|
|
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_INT|CTLFLAG_RW,
|
|
&sb_max, 0, sysctl_handle_sb_max, "I", "Maximum socket buffer size");
|
|
SYSCTL_INT(_kern_ipc, OID_AUTO, maxsockets, CTLFLAG_RD,
|
|
&maxsockets, 0, "Maximum number of sockets avaliable");
|
|
SYSCTL_INT(_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);
|