#include <sys/param.h>
#include <sys/systm.h>
#include <sys/domain.h>
#include <sys/kernel.h>
#include <sys/proc_internal.h>
#include <sys/kauth.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/mcache.h>
#include <sys/protosw.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/signalvar.h>
#include <sys/sysctl.h>
#include <sys/ev.h>
#include <kern/locks.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_pcb.h>
#include <sys/kdebug.h>
#include <libkern/OSAtomic.h>
#if CONFIG_MACF
#include <security/mac_framework.h>
#endif
#include <mach/vm_param.h>
extern void postevent(struct socket *, struct sockbuf *, int);
#define DBG_FNC_SBDROP NETDBG_CODE(DBG_NETSOCK, 4)
#define DBG_FNC_SBAPPEND NETDBG_CODE(DBG_NETSOCK, 5)
static inline void sbcompress(struct sockbuf *, struct mbuf *, struct mbuf *);
static struct socket *sonewconn_internal(struct socket *, int);
static int sbappendaddr_internal(struct sockbuf *, struct sockaddr *,
struct mbuf *, struct mbuf *);
static int sbappendcontrol_internal(struct sockbuf *, struct mbuf *,
struct mbuf *);
static int soqlimitcompat = 1;
static int soqlencomp = 0;
u_int32_t sb_max = SB_MAX;
u_int32_t high_sb_max = SB_MAX;
static u_int32_t sb_efficiency = 8;
__private_extern__ int32_t total_sbmb_cnt = 0;
__private_extern__ u_int32_t net_io_policy_throttled = 0;
static int sysctl_io_policy_throttled SYSCTL_HANDLER_ARGS;
void
soisconnecting(struct socket *so)
{
so->so_state &= ~(SS_ISCONNECTED|SS_ISDISCONNECTING);
so->so_state |= SS_ISCONNECTING;
sflt_notify(so, sock_evt_connecting, NULL);
}
void
soisconnected(struct socket *so)
{
struct socket *head = so->so_head;
so->so_state &= ~(SS_ISCONNECTING|SS_ISDISCONNECTING|SS_ISCONFIRMING);
so->so_state |= SS_ISCONNECTED;
sflt_notify(so, sock_evt_connected, NULL);
if (head && (so->so_state & SS_INCOMP)) {
so->so_state &= ~SS_INCOMP;
so->so_state |= SS_COMP;
if (head->so_proto->pr_getlock != NULL) {
socket_unlock(so, 0);
socket_lock(head, 1);
}
postevent(head, 0, EV_RCONN);
TAILQ_REMOVE(&head->so_incomp, so, so_list);
head->so_incqlen--;
TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
sorwakeup(head);
wakeup_one((caddr_t)&head->so_timeo);
if (head->so_proto->pr_getlock != NULL) {
socket_unlock(head, 1);
socket_lock(so, 0);
}
} else {
postevent(so, 0, EV_WCONN);
wakeup((caddr_t)&so->so_timeo);
sorwakeup(so);
sowwakeup(so);
soevent(so, SO_FILT_HINT_LOCKED);
}
}
void
soisdisconnecting(struct socket *so)
{
so->so_state &= ~SS_ISCONNECTING;
so->so_state |= (SS_ISDISCONNECTING|SS_CANTRCVMORE|SS_CANTSENDMORE);
soevent(so, SO_FILT_HINT_LOCKED);
sflt_notify(so, sock_evt_disconnecting, NULL);
wakeup((caddr_t)&so->so_timeo);
sowwakeup(so);
sorwakeup(so);
}
void
soisdisconnected(struct socket *so)
{
so->so_state &= ~(SS_ISCONNECTING|SS_ISCONNECTED|SS_ISDISCONNECTING);
so->so_state |= (SS_CANTRCVMORE|SS_CANTSENDMORE|SS_ISDISCONNECTED);
soevent(so, SO_FILT_HINT_LOCKED);
sflt_notify(so, sock_evt_disconnected, NULL);
wakeup((caddr_t)&so->so_timeo);
sowwakeup(so);
sorwakeup(so);
}
void
sodisconnectwakeup(struct socket *so)
{
so->so_state &= ~(SS_ISCONNECTING|SS_ISCONNECTED|SS_ISDISCONNECTING);
so->so_state |= (SS_CANTRCVMORE|SS_CANTSENDMORE|SS_ISDISCONNECTED);
soevent(so, SO_FILT_HINT_LOCKED);
wakeup((caddr_t)&so->so_timeo);
sowwakeup(so);
sorwakeup(so);
}
static struct socket *
sonewconn_internal(struct socket *head, int connstatus)
{
int so_qlen, error = 0;
struct socket *so;
lck_mtx_t *mutex_held;
if (head->so_proto->pr_getlock != NULL)
mutex_held = (*head->so_proto->pr_getlock)(head, 0);
else
mutex_held = head->so_proto->pr_domain->dom_mtx;
lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED);
if (!soqlencomp) {
so_qlen = head->so_qlen;
} else {
so_qlen = head->so_qlen - head->so_incqlen;
if (head->so_incqlen > somaxconn)
so_qlen = somaxconn;
}
if (so_qlen >=
(soqlimitcompat ? head->so_qlimit : (3 * head->so_qlimit / 2)))
return ((struct socket *)0);
so = soalloc(1, head->so_proto->pr_domain->dom_family,
head->so_type);
if (so == NULL)
return ((struct socket *)0);
if (head->so_proto == NULL) {
sodealloc(so);
return ((struct socket *)0);
}
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_pgid = head->so_pgid;
kauth_cred_ref(head->so_cred);
so->so_cred = head->so_cred;
so->last_pid = head->last_pid;
so->last_upid = head->last_upid;
so->so_flags = head->so_flags & (SOF_NOSIGPIPE |
SOF_NOADDRAVAIL |
SOF_REUSESHAREUID |
SOF_NOTIFYCONFLICT |
SOF_BINDRANDOMPORT |
SOF_NPX_SETOPTSHUT |
SOF_NODEFUNCT |
SOF_PRIVILEGED_TRAFFIC_CLASS|
SOF_NOTSENT_LOWAT |
SOF_USELRO);
so->so_usecount = 1;
so->next_lock_lr = 0;
so->next_unlock_lr = 0;
#ifdef __APPLE__
so->so_rcv.sb_flags |= SB_RECV;
so->so_rcv.sb_so = so->so_snd.sb_so = so;
TAILQ_INIT(&so->so_evlist);
#endif
#if CONFIG_MACF_SOCKET
mac_socket_label_associate_accept(head, so);
#endif
so->so_traffic_mgt_flags = head->so_traffic_mgt_flags & (TRAFFIC_MGT_SO_BACKGROUND);
so->so_background_thread = head->so_background_thread;
so->so_traffic_class = head->so_traffic_class;
if (soreserve(so, head->so_snd.sb_hiwat, head->so_rcv.sb_hiwat)) {
sodealloc(so);
return ((struct socket *)0);
}
so->so_rcv.sb_flags |= (head->so_rcv.sb_flags & SB_USRSIZE);
so->so_snd.sb_flags |= (head->so_snd.sb_flags & SB_USRSIZE);
if (head->so_proto->pr_unlock)
socket_unlock(head, 0);
if (((*so->so_proto->pr_usrreqs->pru_attach)(so, 0, NULL) != 0) ||
error) {
sodealloc(so);
if (head->so_proto->pr_unlock)
socket_lock(head, 0);
return ((struct socket *)0);
}
if (head->so_proto->pr_unlock) {
socket_lock(head, 0);
if ((head->so_options & SO_ACCEPTCONN) == 0) {
so->so_state &= ~SS_NOFDREF;
soclose(so);
return ((struct socket *)0);
}
}
#ifdef __APPLE__
so->so_proto->pr_domain->dom_refs++;
#endif
so->so_head = head;
so->so_flags |= SOF_INCOMP_INPROGRESS;
if (connstatus) {
TAILQ_INSERT_TAIL(&head->so_comp, so, so_list);
so->so_state |= SS_COMP;
} else {
TAILQ_INSERT_TAIL(&head->so_incomp, so, so_list);
so->so_state |= SS_INCOMP;
head->so_incqlen++;
}
head->so_qlen++;
#ifdef __APPLE__
sflt_initsock(so);
#endif
if (connstatus) {
so->so_state |= connstatus;
sorwakeup(head);
wakeup((caddr_t)&head->so_timeo);
}
return (so);
}
struct socket *
sonewconn(struct socket *head, int connstatus, const struct sockaddr *from)
{
int error = sflt_connectin(head, from);
if (error) {
return (NULL);
}
return (sonewconn_internal(head, connstatus));
}
void
socantsendmore(struct socket *so)
{
so->so_state |= SS_CANTSENDMORE;
soevent(so, SO_FILT_HINT_LOCKED);
sflt_notify(so, sock_evt_cantsendmore, NULL);
sowwakeup(so);
}
void
socantrcvmore(struct socket *so)
{
so->so_state |= SS_CANTRCVMORE;
soevent(so, SO_FILT_HINT_LOCKED);
sflt_notify(so, sock_evt_cantrecvmore, NULL);
sorwakeup(so);
}
int
sbwait(struct sockbuf *sb)
{
int error = 0;
uintptr_t lr_saved;
struct socket *so = sb->sb_so;
lck_mtx_t *mutex_held;
struct timespec ts;
lr_saved = (uintptr_t) __builtin_return_address(0);
if (so->so_proto->pr_getlock != NULL)
mutex_held = (*so->so_proto->pr_getlock)(so, 0);
else
mutex_held = so->so_proto->pr_domain->dom_mtx;
lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED);
sb->sb_flags |= SB_WAIT;
if (so->so_usecount < 1)
panic("sbwait: so=%p refcount=%d\n", so, so->so_usecount);
ts.tv_sec = sb->sb_timeo.tv_sec;
ts.tv_nsec = sb->sb_timeo.tv_usec * 1000;
error = msleep((caddr_t)&sb->sb_cc, mutex_held,
(sb->sb_flags & SB_NOINTR) ? PSOCK : PSOCK | PCATCH, "sbwait", &ts);
lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED);
if (so->so_usecount < 1)
panic("sbwait: so=%p refcount=%d\n", so, so->so_usecount);
if ((so->so_state & SS_DRAINING) || (so->so_flags & SOF_DEFUNCT)) {
error = EBADF;
if (so->so_flags & SOF_DEFUNCT) {
SODEFUNCTLOG(("%s[%d]: defunct so %p [%d,%d] (%d)\n",
__func__, proc_selfpid(), so, INP_SOCKAF(so),
INP_SOCKTYPE(so), error));
}
}
return (error);
}
int
sb_lock(struct sockbuf *sb)
{
struct socket *so = sb->sb_so;
lck_mtx_t *mutex_held;
int error = 0;
if (so == NULL)
panic("sb_lock: null so back pointer sb=%p\n", sb);
while (sb->sb_flags & SB_LOCK) {
sb->sb_flags |= SB_WANT;
if (so->so_proto->pr_getlock != NULL)
mutex_held = (*so->so_proto->pr_getlock)(so, 0);
else
mutex_held = so->so_proto->pr_domain->dom_mtx;
lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED);
if (so->so_usecount < 1)
panic("sb_lock: so=%p refcount=%d\n", so,
so->so_usecount);
error = msleep((caddr_t)&sb->sb_flags, mutex_held,
(sb->sb_flags & SB_NOINTR) ? PSOCK : PSOCK | PCATCH,
"sb_lock", 0);
if (so->so_usecount < 1)
panic("sb_lock: 2 so=%p refcount=%d\n", so,
so->so_usecount);
if (error == 0 && (so->so_flags & SOF_DEFUNCT)) {
error = EBADF;
SODEFUNCTLOG(("%s[%d]: defunct so %p [%d,%d] (%d)\n",
__func__, proc_selfpid(), so, INP_SOCKAF(so),
INP_SOCKTYPE(so), error));
}
if (error)
return (error);
}
sb->sb_flags |= SB_LOCK;
return (0);
}
void
sbwakeup(struct sockbuf *sb)
{
if (sb->sb_flags & SB_WAIT) {
sb->sb_flags &= ~SB_WAIT;
wakeup((caddr_t)&sb->sb_cc);
}
}
void
sowakeup(struct socket *so, struct sockbuf *sb)
{
if (so->so_flags & SOF_DEFUNCT) {
SODEFUNCTLOG(("%s[%d]: defunct so %p [%d,%d] si 0x%x, "
"fl 0x%x [%s]\n", __func__, proc_selfpid(), so,
INP_SOCKAF(so), INP_SOCKTYPE(so),
(uint32_t)sb->sb_sel.si_flags, (uint16_t)sb->sb_flags,
(sb->sb_flags & SB_RECV) ? "rcv" : "snd"));
}
sb->sb_flags &= ~SB_SEL;
selwakeup(&sb->sb_sel);
sbwakeup(sb);
if (so->so_state & SS_ASYNC) {
if (so->so_pgid < 0)
gsignal(-so->so_pgid, SIGIO);
else if (so->so_pgid > 0)
proc_signal(so->so_pgid, SIGIO);
}
if (sb->sb_flags & SB_KNOTE) {
KNOTE(&sb->sb_sel.si_note, SO_FILT_HINT_LOCKED);
}
if (sb->sb_flags & SB_UPCALL) {
void (*so_upcall)(struct socket *, caddr_t, int);
caddr_t so_upcallarg;
so_upcall = so->so_upcall;
so_upcallarg = so->so_upcallarg;
so->so_upcallusecount++;
socket_unlock(so, 0);
(*so_upcall)(so, so_upcallarg, M_DONTWAIT);
socket_lock(so, 0);
so->so_upcallusecount--;
if (so->so_flags & SOF_CLOSEWAIT && so->so_upcallusecount == 0)
wakeup((caddr_t)&so->so_upcall);
}
}
int
soreserve(struct socket *so, u_int32_t sndcc, u_int32_t rcvcc)
{
if (sbreserve(&so->so_snd, sndcc) == 0)
goto bad;
else
so->so_snd.sb_idealsize = sndcc;
if (sbreserve(&so->so_rcv, rcvcc) == 0)
goto bad2;
else
so->so_rcv.sb_idealsize = rcvcc;
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:
#ifdef __APPLE__
selthreadclear(&so->so_snd.sb_sel);
#endif
sbrelease(&so->so_snd);
bad:
return (ENOBUFS);
}
int
sbreserve(struct sockbuf *sb, u_int32_t cc)
{
if ((u_quad_t)cc > (u_quad_t)sb_max * MCLBYTES / (MSIZE + MCLBYTES))
return (0);
sb->sb_hiwat = cc;
sb->sb_mbmax = min(cc * sb_efficiency, sb_max);
if (sb->sb_lowat > sb->sb_hiwat)
sb->sb_lowat = sb->sb_hiwat;
return (1);
}
void
sbrelease(struct sockbuf *sb)
{
sbflush(sb);
sb->sb_hiwat = 0;
sb->sb_mbmax = 0;
}
int
sbappend(struct sockbuf *sb, struct mbuf *m)
{
struct socket *so = sb->sb_so;
if (m == NULL || (sb->sb_flags & SB_DROP)) {
if (m != NULL)
m_freem(m);
return (0);
}
SBLASTRECORDCHK(sb, "sbappend 1");
if (sb->sb_lastrecord != NULL && (sb->sb_mbtail->m_flags & M_EOR))
return (sbappendrecord(sb, m));
if (sb->sb_flags & SB_RECV) {
int error = sflt_data_in(so, NULL, &m, NULL, 0);
SBLASTRECORDCHK(sb, "sbappend 2");
if (error != 0) {
if (error != EJUSTRETURN)
m_freem(m);
return (0);
}
}
if (sb->sb_lastrecord == NULL)
sb->sb_lastrecord = m;
sbcompress(sb, m, sb->sb_mbtail);
SBLASTRECORDCHK(sb, "sbappend 3");
return (1);
}
int
sbappendstream(struct sockbuf *sb, struct mbuf *m)
{
struct socket *so = sb->sb_so;
if (m->m_nextpkt != NULL || (sb->sb_mb != sb->sb_lastrecord))
panic("sbappendstream: nexpkt %p || mb %p != lastrecord %p\n",
m->m_nextpkt, sb->sb_mb, sb->sb_lastrecord);
SBLASTMBUFCHK(sb, __func__);
if (m == NULL || (sb->sb_flags & SB_DROP)) {
if (m != NULL)
m_freem(m);
return (0);
}
if (sb->sb_flags & SB_RECV) {
int error = sflt_data_in(so, NULL, &m, NULL, 0);
SBLASTRECORDCHK(sb, "sbappendstream 1");
if (error != 0) {
if (error != EJUSTRETURN)
m_freem(m);
return (0);
}
}
sbcompress(sb, m, sb->sb_mbtail);
sb->sb_lastrecord = sb->sb_mb;
SBLASTRECORDCHK(sb, "sbappendstream 2");
return (1);
}
#ifdef SOCKBUF_DEBUG
void
sbcheck(struct sockbuf *sb)
{
struct mbuf *m;
struct mbuf *n = 0;
u_int32_t len = 0, mbcnt = 0;
lck_mtx_t *mutex_held;
if (sb->sb_so->so_proto->pr_getlock != NULL)
mutex_held = (*sb->sb_so->so_proto->pr_getlock)(sb->sb_so, 0);
else
mutex_held = sb->sb_so->so_proto->pr_domain->dom_mtx;
lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED);
if (sbchecking == 0)
return;
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)
mbcnt += m->m_ext.ext_size;
}
}
if (len != sb->sb_cc || mbcnt != sb->sb_mbcnt) {
panic("cc %ld != %ld || mbcnt %ld != %ld\n", len, sb->sb_cc,
mbcnt, sb->sb_mbcnt);
}
}
#endif
void
sblastrecordchk(struct sockbuf *sb, const char *where)
{
struct mbuf *m = sb->sb_mb;
while (m && m->m_nextpkt)
m = m->m_nextpkt;
if (m != sb->sb_lastrecord) {
printf("sblastrecordchk: mb %p lastrecord %p last %p\n",
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("sblastrecordchk from %s", where);
}
}
void
sblastmbufchk(struct sockbuf *sb, const char *where)
{
struct mbuf *m = sb->sb_mb;
struct mbuf *n;
while (m && m->m_nextpkt)
m = m->m_nextpkt;
while (m && m->m_next)
m = m->m_next;
if (m != sb->sb_mbtail) {
printf("sblastmbufchk: mb %p mbtail %p last %p\n",
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("sblastmbufchk from %s", where);
}
}
int
sbappendrecord(struct sockbuf *sb, struct mbuf *m0)
{
struct mbuf *m;
int space = 0;
if (m0 == NULL || (sb->sb_flags & SB_DROP)) {
if (m0 != NULL)
m_freem(m0);
return (0);
}
for (m = m0; m != NULL; m = m->m_next)
space += m->m_len;
if (space > sbspace(sb) && !(sb->sb_flags & SB_UNIX)) {
m_freem(m0);
return (0);
}
if (sb->sb_flags & SB_RECV) {
int error = sflt_data_in(sb->sb_so, NULL, &m0, NULL,
sock_data_filt_flag_record);
if (error != 0) {
SBLASTRECORDCHK(sb, "sbappendrecord 1");
if (error != EJUSTRETURN)
m_freem(m0);
return (0);
}
}
sballoc(sb, m0);
SBLASTRECORDCHK(sb, "sbappendrecord 2");
if (sb->sb_lastrecord != NULL) {
sb->sb_lastrecord->m_nextpkt = m0;
} else {
sb->sb_mb = m0;
}
sb->sb_lastrecord = 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;
}
sbcompress(sb, m, m0);
SBLASTRECORDCHK(sb, "sbappendrecord 3");
return (1);
}
int
sbinsertoob(struct sockbuf *sb, struct mbuf *m0)
{
struct mbuf *m;
struct mbuf **mp;
if (m0 == 0)
return (0);
SBLASTRECORDCHK(sb, "sbinsertoob 1");
if ((sb->sb_flags & SB_RECV) != 0) {
int error = sflt_data_in(sb->sb_so, NULL, &m0, NULL,
sock_data_filt_flag_oob);
SBLASTRECORDCHK(sb, "sbinsertoob 2");
if (error) {
if (error != EJUSTRETURN) {
m_freem(m0);
}
return (0);
}
}
for (mp = &sb->sb_mb; *mp; mp = &((*mp)->m_nextpkt)) {
m = *mp;
again:
switch (m->m_type) {
case MT_OOBDATA:
continue;
case MT_CONTROL:
m = m->m_next;
if (m)
goto again;
}
break;
}
sballoc(sb, m0);
m0->m_nextpkt = *mp;
if (*mp == NULL) {
sb->sb_lastrecord = m0;
}
*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);
SBLASTRECORDCHK(sb, "sbinsertoob 3");
return (1);
}
static int
sbappendaddr_internal(struct sockbuf *sb, struct sockaddr *asa,
struct mbuf *m0, struct mbuf *control)
{
struct mbuf *m, *n, *nlast;
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)
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((caddr_t)asa, mtod(m, caddr_t), asa->sa_len);
if (n)
n->m_next = m0;
else
control = m0;
m->m_next = control;
SBLASTRECORDCHK(sb, "sbappendadddr 1");
for (n = m; n->m_next != NULL; n = n->m_next)
sballoc(sb, n);
sballoc(sb, n);
nlast = n;
if (sb->sb_lastrecord != NULL) {
sb->sb_lastrecord->m_nextpkt = m;
} else {
sb->sb_mb = m;
}
sb->sb_lastrecord = m;
sb->sb_mbtail = nlast;
SBLASTMBUFCHK(sb, __func__);
SBLASTRECORDCHK(sb, "sbappendadddr 2");
postevent(0, sb, EV_RWBYTES);
return (1);
}
int
sbappendaddr(struct sockbuf *sb, struct sockaddr *asa, struct mbuf *m0,
struct mbuf *control, int *error_out)
{
int result = 0;
boolean_t sb_unix = (sb->sb_flags & SB_UNIX);
if (error_out)
*error_out = 0;
if (m0 && (m0->m_flags & M_PKTHDR) == 0)
panic("sbappendaddrorfree");
if (sb->sb_flags & SB_DROP) {
if (m0 != NULL)
m_freem(m0);
if (control != NULL && !sb_unix)
m_freem(control);
if (error_out != NULL)
*error_out = EINVAL;
return (0);
}
if ((sb->sb_flags & SB_RECV) != 0) {
int error;
error = sflt_data_in(sb->sb_so, asa, &m0, &control, 0);
SBLASTRECORDCHK(sb, __func__);
if (error) {
if (error != EJUSTRETURN) {
if (m0)
m_freem(m0);
if (control != NULL && !sb_unix)
m_freem(control);
if (error_out)
*error_out = error;
}
return (0);
}
}
result = sbappendaddr_internal(sb, asa, m0, control);
if (result == 0) {
if (m0)
m_freem(m0);
if (control != NULL && !sb_unix)
m_freem(control);
if (error_out)
*error_out = ENOBUFS;
}
return (result);
}
static int
sbappendcontrol_internal(struct sockbuf *sb, struct mbuf *m0,
struct mbuf *control)
{
struct mbuf *m, *mlast, *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;
for (m = m0; m; m = m->m_next)
space += m->m_len;
if (space > sbspace(sb) && !(sb->sb_flags & SB_UNIX))
return (0);
n->m_next = m0;
SBLASTRECORDCHK(sb, "sbappendcontrol 1");
for (m = control; m->m_next != NULL; m = m->m_next)
sballoc(sb, m);
sballoc(sb, m);
mlast = m;
if (sb->sb_lastrecord != NULL) {
sb->sb_lastrecord->m_nextpkt = control;
} else {
sb->sb_mb = control;
}
sb->sb_lastrecord = control;
sb->sb_mbtail = mlast;
SBLASTMBUFCHK(sb, __func__);
SBLASTRECORDCHK(sb, "sbappendcontrol 2");
postevent(0, sb, EV_RWBYTES);
return (1);
}
int
sbappendcontrol(struct sockbuf *sb, struct mbuf *m0, struct mbuf *control,
int *error_out)
{
int result = 0;
boolean_t sb_unix = (sb->sb_flags & SB_UNIX);
if (error_out)
*error_out = 0;
if (sb->sb_flags & SB_DROP) {
if (m0 != NULL)
m_freem(m0);
if (control != NULL && !sb_unix)
m_freem(control);
if (error_out != NULL)
*error_out = EINVAL;
return (0);
}
if (sb->sb_flags & SB_RECV) {
int error;
error = sflt_data_in(sb->sb_so, NULL, &m0, &control, 0);
SBLASTRECORDCHK(sb, __func__);
if (error) {
if (error != EJUSTRETURN) {
if (m0)
m_freem(m0);
if (control != NULL && !sb_unix)
m_freem(control);
if (error_out)
*error_out = error;
}
return (0);
}
}
result = sbappendcontrol_internal(sb, m0, control);
if (result == 0) {
if (m0)
m_freem(m0);
if (control != NULL && !sb_unix)
m_freem(control);
if (error_out)
*error_out = ENOBUFS;
}
return (result);
}
static inline void
sbcompress(struct sockbuf *sb, struct mbuf *m, struct mbuf *n)
{
int eor = 0;
struct mbuf *o;
if (m == NULL) {
for (; n->m_next != NULL; n = n->m_next)
;
sb->sb_mbtail = n;
goto done;
}
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 &&
#ifndef __APPLE__
M_WRITABLE(n) &&
#endif
m->m_len <= MCLBYTES / 4 &&
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_HEADER &&
m->m_type != MT_OOBDATA)
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) {
if (n)
n->m_flags |= eor;
else
printf("semi-panic: sbcompress\n");
}
done:
SBLASTMBUFCHK(sb, __func__);
postevent(0, sb, EV_RWBYTES);
}
void
sb_empty_assert(struct sockbuf *sb, const char *where)
{
if (!(sb->sb_cc == 0 && sb->sb_mb == NULL && sb->sb_mbcnt == 0 &&
sb->sb_mbtail == NULL && sb->sb_lastrecord == NULL)) {
panic("%s: sb %p so %p cc %d mbcnt %d mb %p mbtail %p "
"lastrecord %p\n", where, sb, sb->sb_so, sb->sb_cc,
sb->sb_mbcnt, sb->sb_mb, sb->sb_mbtail, sb->sb_lastrecord);
}
}
void
sbflush(struct sockbuf *sb)
{
if (sb->sb_so == NULL)
panic("sbflush sb->sb_so already null sb=%p\n", sb);
(void) sblock(sb, M_WAIT);
while (sb->sb_mbcnt) {
if (!sb->sb_cc && (sb->sb_mb == NULL || sb->sb_mb->m_len))
break;
sbdrop(sb, (int)sb->sb_cc);
}
sb_empty_assert(sb, __func__);
postevent(0, sb, EV_RWBYTES);
sbunlock(sb, 1);
}
void
sbdrop(struct sockbuf *sb, int len)
{
struct mbuf *m, *free_list, *ml;
struct mbuf *next, *last;
KERNEL_DEBUG((DBG_FNC_SBDROP | DBG_FUNC_START), sb, len, 0, 0, 0);
next = (m = sb->sb_mb) ? m->m_nextpkt : 0;
free_list = last = m;
ml = (struct mbuf *)0;
while (len > 0) {
if (m == 0) {
if (next == 0) {
printf("sbdrop - count not zero\n");
len = 0;
sb->sb_cc = 0;
sb->sb_mbcnt = 0;
break;
}
m = last = 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_HEADER &&
m->m_type != MT_OOBDATA)
sb->sb_ctl -= len;
break;
}
len -= m->m_len;
sbfree(sb, m);
ml = m;
m = m->m_next;
}
while (m && m->m_len == 0) {
sbfree(sb, m);
ml = m;
m = m->m_next;
}
if (ml) {
ml->m_next = (struct mbuf *)0;
last->m_nextpkt = (struct mbuf *)0;
m_freem_list(free_list);
}
if (m) {
sb->sb_mb = m;
m->m_nextpkt = next;
} else {
sb->sb_mb = next;
}
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;
}
postevent(0, sb, EV_RWBYTES);
KERNEL_DEBUG((DBG_FNC_SBDROP | DBG_FUNC_END), sb, 0, 0, 0, 0);
}
void
sbdroprecord(struct sockbuf *sb)
{
struct mbuf *m, *mn;
m = sb->sb_mb;
if (m) {
sb->sb_mb = m->m_nextpkt;
do {
sbfree(sb, m);
MFREE(m, mn);
m = mn;
} while (m);
}
SB_EMPTY_FIXUP(sb);
postevent(0, sb, EV_RWBYTES);
}
struct mbuf *
sbcreatecontrol(caddr_t p, int size, int type, int level)
{
struct cmsghdr *cp;
struct mbuf *m;
if (CMSG_SPACE((u_int)size) > MLEN)
return ((struct mbuf *)NULL);
if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL)
return ((struct mbuf *)NULL);
cp = mtod(m, struct cmsghdr *);
VERIFY(IS_P2ALIGNED(cp, sizeof (u_int32_t)));
(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);
}
struct mbuf**
sbcreatecontrol_mbuf(caddr_t p, int size, int type, int level, struct mbuf** mp)
{
struct mbuf* m;
struct cmsghdr *cp;
if (*mp == NULL){
*mp = sbcreatecontrol(p, size, type, level);
return mp;
}
if (CMSG_SPACE((u_int)size) + (*mp)->m_len > MLEN){
mp = &(*mp)->m_next;
*mp = sbcreatecontrol(p, size, type, level);
return mp;
}
m = *mp;
cp = (struct cmsghdr *)(void *)(mtod(m, char *) + m->m_len);
VERIFY(IS_P2ALIGNED(cp, sizeof (u_int32_t)));
m->m_len += CMSG_SPACE(size);
(void) memcpy(CMSG_DATA(cp), p, size);
cp->cmsg_len = CMSG_LEN(size);
cp->cmsg_level = level;
cp->cmsg_type = type;
return mp;
}
int
pru_abort_notsupp(__unused struct socket *so)
{
return (EOPNOTSUPP);
}
int
pru_accept_notsupp(__unused struct socket *so, __unused struct sockaddr **nam)
{
return (EOPNOTSUPP);
}
int
pru_attach_notsupp(__unused struct socket *so, __unused int proto,
__unused struct proc *p)
{
return (EOPNOTSUPP);
}
int
pru_bind_notsupp(__unused struct socket *so, __unused struct sockaddr *nam,
__unused struct proc *p)
{
return (EOPNOTSUPP);
}
int
pru_connect_notsupp(__unused struct socket *so, __unused struct sockaddr *nam,
__unused struct proc *p)
{
return (EOPNOTSUPP);
}
int
pru_connect2_notsupp(__unused struct socket *so1, __unused struct socket *so2)
{
return (EOPNOTSUPP);
}
int
pru_control_notsupp(__unused struct socket *so, __unused u_long cmd,
__unused caddr_t data, __unused struct ifnet *ifp, __unused struct proc *p)
{
return (EOPNOTSUPP);
}
int
pru_detach_notsupp(__unused struct socket *so)
{
return (EOPNOTSUPP);
}
int
pru_disconnect_notsupp(__unused struct socket *so)
{
return (EOPNOTSUPP);
}
int
pru_listen_notsupp(__unused struct socket *so, __unused struct proc *p)
{
return (EOPNOTSUPP);
}
int
pru_peeraddr_notsupp(__unused struct socket *so, __unused struct sockaddr **nam)
{
return (EOPNOTSUPP);
}
int
pru_rcvd_notsupp(__unused struct socket *so, __unused int flags)
{
return (EOPNOTSUPP);
}
int
pru_rcvoob_notsupp(__unused struct socket *so, __unused struct mbuf *m,
__unused int flags)
{
return (EOPNOTSUPP);
}
int
pru_send_notsupp(__unused struct socket *so, __unused int flags,
__unused struct mbuf *m, __unused struct sockaddr *addr,
__unused struct mbuf *control, __unused struct proc *p)
{
return (EOPNOTSUPP);
}
int
pru_sense_null(struct socket *so, void *ub, int isstat64)
{
if (isstat64 != 0) {
struct stat64 *sb64;
sb64 = (struct stat64 *)ub;
sb64->st_blksize = so->so_snd.sb_hiwat;
} else {
struct stat *sb;
sb = (struct stat *)ub;
sb->st_blksize = so->so_snd.sb_hiwat;
}
return (0);
}
int
pru_sosend_notsupp(__unused struct socket *so, __unused struct sockaddr *addr,
__unused struct uio *uio, __unused struct mbuf *top,
__unused struct mbuf *control, __unused int flags)
{
return (EOPNOTSUPP);
}
int
pru_soreceive_notsupp(__unused struct socket *so,
__unused struct sockaddr **paddr,
__unused struct uio *uio, __unused struct mbuf **mp0,
__unused struct mbuf **controlp, __unused int *flagsp)
{
return (EOPNOTSUPP);
}
int
pru_shutdown_notsupp(__unused struct socket *so)
{
return (EOPNOTSUPP);
}
int
pru_sockaddr_notsupp(__unused struct socket *so, __unused struct sockaddr **nam)
{
return (EOPNOTSUPP);
}
int
pru_sopoll_notsupp(__unused struct socket *so, __unused int events,
__unused kauth_cred_t cred, __unused void *wql)
{
return (EOPNOTSUPP);
}
#ifdef __APPLE__
int
sb_notify(struct sockbuf *sb)
{
return ((sb->sb_flags &
(SB_WAIT|SB_SEL|SB_ASYNC|SB_UPCALL|SB_KNOTE)) != 0);
}
int
sbspace(struct sockbuf *sb)
{
int space =
imin((int)(sb->sb_hiwat - sb->sb_cc),
(int)(sb->sb_mbmax - sb->sb_mbcnt));
if (space < 0)
space = 0;
return space;
}
int
sosendallatonce(struct socket *so)
{
return (so->so_proto->pr_flags & PR_ATOMIC);
}
int
soreadable(struct socket *so)
{
return (so->so_rcv.sb_cc >= so->so_rcv.sb_lowat ||
(so->so_state & SS_CANTRCVMORE) ||
so->so_comp.tqh_first || so->so_error);
}
int
sowriteable(struct socket *so)
{
return ((!so_wait_for_if_feedback(so) &&
sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat &&
((so->so_state & SS_ISCONNECTED) ||
(so->so_proto->pr_flags & PR_CONNREQUIRED) == 0)) ||
(so->so_state & SS_CANTSENDMORE) ||
so->so_error);
}
void
sballoc(struct sockbuf *sb, struct mbuf *m)
{
u_int32_t cnt = 1;
sb->sb_cc += m->m_len;
if (m->m_type != MT_DATA && m->m_type != MT_HEADER &&
m->m_type != MT_OOBDATA)
sb->sb_ctl += m->m_len;
sb->sb_mbcnt += MSIZE;
if (m->m_flags & M_EXT) {
sb->sb_mbcnt += m->m_ext.ext_size;
cnt += (m->m_ext.ext_size >> MSIZESHIFT) ;
}
OSAddAtomic(cnt, &total_sbmb_cnt);
VERIFY(total_sbmb_cnt > 0);
}
void
sbfree(struct sockbuf *sb, struct mbuf *m)
{
int cnt = -1;
sb->sb_cc -= m->m_len;
if (m->m_type != MT_DATA && m->m_type != MT_HEADER &&
m->m_type != MT_OOBDATA)
sb->sb_ctl -= m->m_len;
sb->sb_mbcnt -= MSIZE;
if (m->m_flags & M_EXT) {
sb->sb_mbcnt -= m->m_ext.ext_size;
cnt -= (m->m_ext.ext_size >> MSIZESHIFT) ;
}
OSAddAtomic(cnt, &total_sbmb_cnt);
VERIFY(total_sbmb_cnt >= 0);
}
int
sblock(struct sockbuf *sb, int wf)
{
int error = 0;
if (sb->sb_flags & SB_LOCK)
error = (wf == M_WAIT) ? sb_lock(sb) : EWOULDBLOCK;
else
sb->sb_flags |= SB_LOCK;
return (error);
}
void
sbunlock(struct sockbuf *sb, int keeplocked)
{
struct socket *so = sb->sb_so;
void *lr_saved;
lck_mtx_t *mutex_held;
lr_saved = __builtin_return_address(0);
sb->sb_flags &= ~SB_LOCK;
if (sb->sb_flags & SB_WANT) {
sb->sb_flags &= ~SB_WANT;
if (so->so_usecount < 0) {
panic("sbunlock: b4 wakeup so=%p ref=%d lr=%p "
"sb_flags=%x lrh= %s\n", sb->sb_so, so->so_usecount,
lr_saved, sb->sb_flags, solockhistory_nr(so));
}
wakeup((caddr_t)&(sb)->sb_flags);
}
if (keeplocked == 0) {
if (so->so_proto->pr_getlock != NULL)
mutex_held = (*so->so_proto->pr_getlock)(so, 0);
else
mutex_held = so->so_proto->pr_domain->dom_mtx;
lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED);
so->so_usecount--;
if (so->so_usecount < 0)
panic("sbunlock: unlock on exit so=%p ref=%d lr=%p "
"sb_flags=%x lrh= %s\n", so, so->so_usecount, lr_saved,
sb->sb_flags, solockhistory_nr(so));
so->unlock_lr[so->next_unlock_lr] = lr_saved;
so->next_unlock_lr = (so->next_unlock_lr+1) % SO_LCKDBG_MAX;
lck_mtx_unlock(mutex_held);
}
}
void
sorwakeup(struct socket *so)
{
if (sb_notify(&so->so_rcv))
sowakeup(so, &so->so_rcv);
}
void
sowwakeup(struct socket *so)
{
if (sb_notify(&so->so_snd))
sowakeup(so, &so->so_snd);
}
void
soevent(struct socket *so, long hint)
{
if (so->so_flags & SOF_KNOTE)
KNOTE(&so->so_klist, hint);
}
#endif
struct sockaddr *
dup_sockaddr(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);
}
void
sotoxsocket(struct socket *so, struct xsocket *xso)
{
xso->xso_len = sizeof (*xso);
xso->xso_so = (_XSOCKET_PTR(struct socket *))VM_KERNEL_ADDRPERM(so);
xso->so_type = so->so_type;
xso->so_options = (short)(so->so_options & 0xffff);
xso->so_linger = so->so_linger;
xso->so_state = so->so_state;
xso->so_pcb = (_XSOCKET_PTR(caddr_t))VM_KERNEL_ADDRPERM(so->so_pcb);
if (so->so_proto) {
xso->xso_protocol = so->so_proto->pr_protocol;
xso->xso_family = so->so_proto->pr_domain->dom_family;
} else {
xso->xso_protocol = xso->xso_family = 0;
}
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_pgid;
xso->so_oobmark = so->so_oobmark;
sbtoxsockbuf(&so->so_snd, &xso->so_snd);
sbtoxsockbuf(&so->so_rcv, &xso->so_rcv);
xso->so_uid = kauth_cred_getuid(so->so_cred);
}
#if !CONFIG_EMBEDDED
void
sotoxsocket64(struct socket *so, struct xsocket64 *xso)
{
xso->xso_len = sizeof (*xso);
xso->xso_so = (u_int64_t)VM_KERNEL_ADDRPERM(so);
xso->so_type = so->so_type;
xso->so_options = (short)(so->so_options & 0xffff);
xso->so_linger = so->so_linger;
xso->so_state = so->so_state;
xso->so_pcb = (u_int64_t)VM_KERNEL_ADDRPERM(so->so_pcb);
if (so->so_proto) {
xso->xso_protocol = so->so_proto->pr_protocol;
xso->xso_family = so->so_proto->pr_domain->dom_family;
} else {
xso->xso_protocol = xso->xso_family = 0;
}
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_pgid;
xso->so_oobmark = so->so_oobmark;
sbtoxsockbuf(&so->so_snd, &xso->so_snd);
sbtoxsockbuf(&so->so_rcv, &xso->so_rcv);
xso->so_uid = kauth_cred_getuid(so->so_cred);
}
#endif
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 = (short)
(sb->sb_timeo.tv_sec * hz) + sb->sb_timeo.tv_usec / tick;
if (xsb->sb_timeo == 0 && sb->sb_timeo.tv_usec != 0)
xsb->sb_timeo = 1;
}
int
soisthrottled(struct socket *so)
{
return (
#if CONFIG_EMBEDDED
net_io_policy_throttled &&
#endif
(so->so_traffic_mgt_flags & TRAFFIC_MGT_SO_BACKGROUND));
}
int
soisprivilegedtraffic(struct socket *so)
{
return (so->so_flags & SOF_PRIVILEGED_TRAFFIC_CLASS);
}
SYSCTL_NODE(_kern, KERN_IPC, ipc, CTLFLAG_RW|CTLFLAG_LOCKED|CTLFLAG_ANYBODY, 0, "IPC");
static int
sysctl_sb_max(__unused struct sysctl_oid *oidp, __unused void *arg1,
__unused int arg2, struct sysctl_req *req)
{
u_int32_t new_value;
int changed = 0;
int error = sysctl_io_number(req, sb_max, sizeof(u_int32_t), &new_value,
&changed);
if (!error && changed) {
if (new_value > LOW_SB_MAX &&
new_value <= high_sb_max ) {
sb_max = new_value;
} else {
error = ERANGE;
}
}
return error;
}
static int
sysctl_io_policy_throttled SYSCTL_HANDLER_ARGS
{
#pragma unused(arg1, arg2)
int i, err;
i = net_io_policy_throttled;
err = sysctl_handle_int(oidp, &i, 0, req);
if (err != 0 || req->newptr == USER_ADDR_NULL)
return (err);
if (i != net_io_policy_throttled)
SOTHROTTLELOG(("throttle: network IO policy throttling is "
"now %s\n", i ? "ON" : "OFF"));
net_io_policy_throttled = i;
return (err);
}
SYSCTL_PROC(_kern_ipc, KIPC_MAXSOCKBUF, maxsockbuf, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
&sb_max, 0, &sysctl_sb_max, "IU", "Maximum socket buffer size");
SYSCTL_INT(_kern_ipc, OID_AUTO, maxsockets, CTLFLAG_RD | CTLFLAG_LOCKED,
&maxsockets, 0, "Maximum number of sockets avaliable");
SYSCTL_INT(_kern_ipc, KIPC_SOCKBUF_WASTE, sockbuf_waste_factor, CTLFLAG_RW | CTLFLAG_LOCKED,
&sb_efficiency, 0, "");
SYSCTL_INT(_kern_ipc, KIPC_NMBCLUSTERS, nmbclusters, CTLFLAG_RD | CTLFLAG_LOCKED,
&nmbclusters, 0, "");
SYSCTL_INT(_kern_ipc, OID_AUTO, njcl, CTLFLAG_RD | CTLFLAG_LOCKED, &njcl, 0, "");
SYSCTL_INT(_kern_ipc, OID_AUTO, njclbytes, CTLFLAG_RD | CTLFLAG_LOCKED, &njclbytes, 0, "");
SYSCTL_INT(_kern_ipc, KIPC_SOQLIMITCOMPAT, soqlimitcompat, CTLFLAG_RW | CTLFLAG_LOCKED,
&soqlimitcompat, 1, "Enable socket queue limit compatibility");
SYSCTL_INT(_kern_ipc, OID_AUTO, soqlencomp, CTLFLAG_RW | CTLFLAG_LOCKED,
&soqlencomp, 0, "Listen backlog represents only complete queue");
SYSCTL_NODE(_kern_ipc, OID_AUTO, io_policy, CTLFLAG_RW, 0, "network IO policy");
SYSCTL_PROC(_kern_ipc_io_policy, OID_AUTO, throttled,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &net_io_policy_throttled, 0,
sysctl_io_policy_throttled, "I", "");