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uipc_usrreq.c
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uipc_usrreq.c
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/*
* Copyright (c) 2000-2015 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* Copyright (c) 1982, 1986, 1989, 1991, 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.
*
* From: @(#)uipc_usrreq.c 8.3 (Berkeley) 1/4/94
*/
/*
* NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
* support for mandatory and extensible security protections. This notice
* is included in support of clause 2.2 (b) of the Apple Public License,
* Version 2.0.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/domain.h>
#include <sys/fcntl.h>
#include <sys/malloc.h> /* XXX must be before <sys/file.h> */
#include <sys/file_internal.h>
#include <sys/guarded.h>
#include <sys/filedesc.h>
#include <sys/lock.h>
#include <sys/mbuf.h>
#include <sys/namei.h>
#include <sys/proc_internal.h>
#include <sys/kauth.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/un.h>
#include <sys/unpcb.h>
#include <sys/vnode_internal.h>
#include <sys/kdebug.h>
#include <sys/mcache.h>
#include <kern/zalloc.h>
#include <kern/locks.h>
#if CONFIG_MACF
#include <security/mac_framework.h>
#endif /* CONFIG_MACF */
#include <mach/vm_param.h>
/*
* Maximum number of FDs that can be passed in an mbuf
*/
#define UIPC_MAX_CMSG_FD 512
#define f_msgcount f_fglob->fg_msgcount
#define f_cred f_fglob->fg_cred
#define f_ops f_fglob->fg_ops
#define f_offset f_fglob->fg_offset
#define f_data f_fglob->fg_data
struct zone *unp_zone;
static unp_gen_t unp_gencnt;
static u_int unp_count;
static lck_attr_t *unp_mtx_attr;
static lck_grp_t *unp_mtx_grp;
static lck_grp_attr_t *unp_mtx_grp_attr;
static lck_rw_t *unp_list_mtx;
static lck_mtx_t *unp_disconnect_lock;
static lck_mtx_t *unp_connect_lock;
static u_int disconnect_in_progress;
extern lck_mtx_t *uipc_lock;
static struct unp_head unp_shead, unp_dhead;
/*
* mDNSResponder tracing. When enabled, endpoints connected to
* /var/run/mDNSResponder will be traced; during each send on
* the traced socket, we log the PID and process name of the
* sending process. We also print out a bit of info related
* to the data itself; this assumes ipc_msg_hdr in dnssd_ipc.h
* of mDNSResponder stays the same.
*/
#define MDNSRESPONDER_PATH "/var/run/mDNSResponder"
static int unpst_tracemdns; /* enable tracing */
#define MDNS_IPC_MSG_HDR_VERSION_1 1
struct mdns_ipc_msg_hdr {
uint32_t version;
uint32_t datalen;
uint32_t ipc_flags;
uint32_t op;
union {
void *context;
uint32_t u32[2];
} __attribute__((packed));
uint32_t reg_index;
} __attribute__((packed));
/*
* Unix communications domain.
*
* TODO:
* SEQPACKET, RDM
* rethink name space problems
* need a proper out-of-band
* lock pushdown
*/
static struct sockaddr sun_noname = { sizeof (sun_noname), AF_LOCAL, { 0 } };
static ino_t unp_ino; /* prototype for fake inode numbers */
static int unp_attach(struct socket *);
static void unp_detach(struct unpcb *);
static int unp_bind(struct unpcb *, struct sockaddr *, proc_t);
static int unp_connect(struct socket *, struct sockaddr *, proc_t);
static void unp_disconnect(struct unpcb *);
static void unp_shutdown(struct unpcb *);
static void unp_drop(struct unpcb *, int);
__private_extern__ void unp_gc(void);
static void unp_scan(struct mbuf *, void (*)(struct fileglob *, void *arg), void *arg);
static void unp_mark(struct fileglob *, __unused void *);
static void unp_discard(struct fileglob *, void *);
static int unp_internalize(struct mbuf *, proc_t);
static int unp_listen(struct unpcb *, proc_t);
static void unpcb_to_compat(struct unpcb *, struct unpcb_compat *);
static void unp_get_locks_in_order(struct socket *so, struct socket *conn_so);
static void
unp_get_locks_in_order(struct socket *so, struct socket *conn_so)
{
if (so < conn_so) {
socket_lock(conn_so, 1);
} else {
struct unpcb *unp = sotounpcb(so);
unp->unp_flags |= UNP_DONTDISCONNECT;
unp->rw_thrcount++;
socket_unlock(so, 0);
/* Get the locks in the correct order */
socket_lock(conn_so, 1);
socket_lock(so, 0);
unp->rw_thrcount--;
if (unp->rw_thrcount == 0) {
unp->unp_flags &= ~UNP_DONTDISCONNECT;
wakeup(unp);
}
}
}
static int
uipc_abort(struct socket *so)
{
struct unpcb *unp = sotounpcb(so);
if (unp == 0)
return (EINVAL);
unp_drop(unp, ECONNABORTED);
unp_detach(unp);
sofree(so);
return (0);
}
static int
uipc_accept(struct socket *so, struct sockaddr **nam)
{
struct unpcb *unp = sotounpcb(so);
if (unp == 0)
return (EINVAL);
/*
* Pass back name of connected socket,
* if it was bound and we are still connected
* (our peer may have closed already!).
*/
if (unp->unp_conn && unp->unp_conn->unp_addr) {
*nam = dup_sockaddr((struct sockaddr *)
unp->unp_conn->unp_addr, 1);
} else {
*nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1);
}
return (0);
}
/*
* Returns: 0 Success
* EISCONN
* unp_attach:
*/
static int
uipc_attach(struct socket *so, __unused int proto, __unused proc_t p)
{
struct unpcb *unp = sotounpcb(so);
if (unp != 0)
return (EISCONN);
return (unp_attach(so));
}
static int
uipc_bind(struct socket *so, struct sockaddr *nam, proc_t p)
{
struct unpcb *unp = sotounpcb(so);
if (unp == 0)
return (EINVAL);
return (unp_bind(unp, nam, p));
}
/*
* Returns: 0 Success
* EINVAL
* unp_connect:??? [See elsewhere in this file]
*/
static int
uipc_connect(struct socket *so, struct sockaddr *nam, proc_t p)
{
struct unpcb *unp = sotounpcb(so);
if (unp == 0)
return (EINVAL);
return (unp_connect(so, nam, p));
}
/*
* Returns: 0 Success
* EINVAL
* unp_connect2:EPROTOTYPE Protocol wrong type for socket
* unp_connect2:EINVAL Invalid argument
*/
static int
uipc_connect2(struct socket *so1, struct socket *so2)
{
struct unpcb *unp = sotounpcb(so1);
if (unp == 0)
return (EINVAL);
return (unp_connect2(so1, so2));
}
/* control is EOPNOTSUPP */
static int
uipc_detach(struct socket *so)
{
struct unpcb *unp = sotounpcb(so);
if (unp == 0)
return (EINVAL);
LCK_MTX_ASSERT(&unp->unp_mtx, LCK_MTX_ASSERT_OWNED);
unp_detach(unp);
return (0);
}
static int
uipc_disconnect(struct socket *so)
{
struct unpcb *unp = sotounpcb(so);
if (unp == 0)
return (EINVAL);
unp_disconnect(unp);
return (0);
}
/*
* Returns: 0 Success
* EINVAL
*/
static int
uipc_listen(struct socket *so, __unused proc_t p)
{
struct unpcb *unp = sotounpcb(so);
if (unp == 0 || unp->unp_vnode == 0)
return (EINVAL);
return (unp_listen(unp, p));
}
static int
uipc_peeraddr(struct socket *so, struct sockaddr **nam)
{
struct unpcb *unp = sotounpcb(so);
if (unp == NULL)
return (EINVAL);
if (unp->unp_conn != NULL && unp->unp_conn->unp_addr != NULL) {
*nam = dup_sockaddr((struct sockaddr *)
unp->unp_conn->unp_addr, 1);
} else {
*nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1);
}
return (0);
}
static int
uipc_rcvd(struct socket *so, __unused int flags)
{
struct unpcb *unp = sotounpcb(so);
struct socket *so2;
if (unp == 0)
return (EINVAL);
switch (so->so_type) {
case SOCK_DGRAM:
panic("uipc_rcvd DGRAM?");
/*NOTREACHED*/
case SOCK_STREAM:
#define rcv (&so->so_rcv)
#define snd (&so2->so_snd)
if (unp->unp_conn == 0)
break;
so2 = unp->unp_conn->unp_socket;
unp_get_locks_in_order(so, so2);
/*
* Adjust backpressure on sender
* and wakeup any waiting to write.
*/
snd->sb_mbmax += unp->unp_mbcnt - rcv->sb_mbcnt;
unp->unp_mbcnt = rcv->sb_mbcnt;
snd->sb_hiwat += unp->unp_cc - rcv->sb_cc;
unp->unp_cc = rcv->sb_cc;
sowwakeup(so2);
socket_unlock(so2, 1);
#undef snd
#undef rcv
break;
default:
panic("uipc_rcvd unknown socktype");
}
return (0);
}
/* pru_rcvoob is EOPNOTSUPP */
/*
* Returns: 0 Success
* EINVAL
* EOPNOTSUPP
* EPIPE
* ENOTCONN
* EISCONN
* unp_internalize:EINVAL
* unp_internalize:EBADF
* unp_connect:EAFNOSUPPORT Address family not supported
* unp_connect:EINVAL Invalid argument
* unp_connect:ENOTSOCK Not a socket
* unp_connect:ECONNREFUSED Connection refused
* unp_connect:EISCONN Socket is connected
* unp_connect:EPROTOTYPE Protocol wrong type for socket
* unp_connect:???
* sbappendaddr:ENOBUFS [5th argument, contents modified]
* sbappendaddr:??? [whatever a filter author chooses]
*/
static int
uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
struct mbuf *control, proc_t p)
{
int error = 0;
struct unpcb *unp = sotounpcb(so);
struct socket *so2;
if (unp == 0) {
error = EINVAL;
goto release;
}
if (flags & PRUS_OOB) {
error = EOPNOTSUPP;
goto release;
}
if (control) {
/* release lock to avoid deadlock (4436174) */
socket_unlock(so, 0);
error = unp_internalize(control, p);
socket_lock(so, 0);
if (error)
goto release;
}
switch (so->so_type) {
case SOCK_DGRAM:
{
struct sockaddr *from;
if (nam) {
if (unp->unp_conn) {
error = EISCONN;
break;
}
error = unp_connect(so, nam, p);
if (error)
break;
} else {
if (unp->unp_conn == 0) {
error = ENOTCONN;
break;
}
}
so2 = unp->unp_conn->unp_socket;
if (so != so2)
unp_get_locks_in_order(so, so2);
if (unp->unp_addr)
from = (struct sockaddr *)unp->unp_addr;
else
from = &sun_noname;
/*
* sbappendaddr() will fail when the receiver runs out of
* space; in contrast to SOCK_STREAM, we will lose messages
* for the SOCK_DGRAM case when the receiver's queue overflows.
* SB_UNIX on the socket buffer implies that the callee will
* not free the control message, if any, because we would need
* to call unp_dispose() on it.
*/
if (sbappendaddr(&so2->so_rcv, from, m, control, &error)) {
control = NULL;
sorwakeup(so2);
} else if (control != NULL && error == 0) {
/* A socket filter took control; don't touch it */
control = NULL;
}
if (so != so2)
socket_unlock(so2, 1);
m = NULL;
if (nam)
unp_disconnect(unp);
break;
}
case SOCK_STREAM: {
int didreceive = 0;
#define rcv (&so2->so_rcv)
#define snd (&so->so_snd)
/* Connect if not connected yet. */
/*
* Note: A better implementation would complain
* if not equal to the peer's address.
*/
if ((so->so_state & SS_ISCONNECTED) == 0) {
if (nam) {
error = unp_connect(so, nam, p);
if (error)
break; /* XXX */
} else {
error = ENOTCONN;
break;
}
}
if (so->so_state & SS_CANTSENDMORE) {
error = EPIPE;
break;
}
if (unp->unp_conn == 0)
panic("uipc_send connected but no connection?");
so2 = unp->unp_conn->unp_socket;
unp_get_locks_in_order(so, so2);
/* Check socket state again as we might have unlocked the socket
* while trying to get the locks in order
*/
if ((so->so_state & SS_CANTSENDMORE)) {
error = EPIPE;
socket_unlock(so2, 1);
break;
}
if (unp->unp_flags & UNP_TRACE_MDNS) {
struct mdns_ipc_msg_hdr hdr;
if (mbuf_copydata(m, 0, sizeof (hdr), &hdr) == 0 &&
hdr.version == ntohl(MDNS_IPC_MSG_HDR_VERSION_1)) {
printf("%s[mDNSResponder] pid=%d (%s): op=0x%x\n",
__func__, p->p_pid, p->p_comm, ntohl(hdr.op));
}
}
/*
* Send to paired receive port, and then reduce send buffer
* hiwater marks to maintain backpressure. Wake up readers.
* SB_UNIX flag will allow new record to be appended to the
* receiver's queue even when it is already full. It is
* possible, however, that append might fail. In that case,
* we will need to call unp_dispose() on the control message;
* the callee will not free it since SB_UNIX is set.
*/
didreceive = control ?
sbappendcontrol(rcv, m, control, &error) : sbappend(rcv, m);
snd->sb_mbmax -= rcv->sb_mbcnt - unp->unp_conn->unp_mbcnt;
unp->unp_conn->unp_mbcnt = rcv->sb_mbcnt;
if ((int32_t)snd->sb_hiwat >=
(int32_t)(rcv->sb_cc - unp->unp_conn->unp_cc)) {
snd->sb_hiwat -= rcv->sb_cc - unp->unp_conn->unp_cc;
} else {
snd->sb_hiwat = 0;
}
unp->unp_conn->unp_cc = rcv->sb_cc;
if (didreceive) {
control = NULL;
sorwakeup(so2);
} else if (control != NULL && error == 0) {
/* A socket filter took control; don't touch it */
control = NULL;
}
socket_unlock(so2, 1);
m = NULL;
#undef snd
#undef rcv
}
break;
default:
panic("uipc_send unknown socktype");
}
/*
* SEND_EOF is equivalent to a SEND followed by
* a SHUTDOWN.
*/
if (flags & PRUS_EOF) {
socantsendmore(so);
unp_shutdown(unp);
}
if (control && error != 0) {
socket_unlock(so, 0);
unp_dispose(control);
socket_lock(so, 0);
}
release:
if (control)
m_freem(control);
if (m)
m_freem(m);
return (error);
}
static int
uipc_sense(struct socket *so, void *ub, int isstat64)
{
struct unpcb *unp = sotounpcb(so);
struct socket *so2;
blksize_t blksize;
if (unp == 0)
return (EINVAL);
blksize = so->so_snd.sb_hiwat;
if (so->so_type == SOCK_STREAM && unp->unp_conn != 0) {
so2 = unp->unp_conn->unp_socket;
blksize += so2->so_rcv.sb_cc;
}
if (unp->unp_ino == 0)
unp->unp_ino = unp_ino++;
if (isstat64 != 0) {
struct stat64 *sb64;
sb64 = (struct stat64 *)ub;
sb64->st_blksize = blksize;
sb64->st_dev = NODEV;
sb64->st_ino = (ino64_t)unp->unp_ino;
} else {
struct stat *sb;
sb = (struct stat *)ub;
sb->st_blksize = blksize;
sb->st_dev = NODEV;
sb->st_ino = (ino_t)(uintptr_t)unp->unp_ino;
}
return (0);
}
/*
* Returns: 0 Success
* EINVAL
*
* Notes: This is not strictly correct, as unp_shutdown() also calls
* socantrcvmore(). These should maybe both be conditionalized
* on the 'how' argument in soshutdown() as called from the
* shutdown() system call.
*/
static int
uipc_shutdown(struct socket *so)
{
struct unpcb *unp = sotounpcb(so);
if (unp == 0)
return (EINVAL);
socantsendmore(so);
unp_shutdown(unp);
return (0);
}
/*
* Returns: 0 Success
* EINVAL Invalid argument
*/
static int
uipc_sockaddr(struct socket *so, struct sockaddr **nam)
{
struct unpcb *unp = sotounpcb(so);
if (unp == NULL)
return (EINVAL);
if (unp->unp_addr != NULL) {
*nam = dup_sockaddr((struct sockaddr *)unp->unp_addr, 1);
} else {
*nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1);
}
return (0);
}
struct pr_usrreqs uipc_usrreqs = {
.pru_abort = uipc_abort,
.pru_accept = uipc_accept,
.pru_attach = uipc_attach,
.pru_bind = uipc_bind,
.pru_connect = uipc_connect,
.pru_connect2 = uipc_connect2,
.pru_detach = uipc_detach,
.pru_disconnect = uipc_disconnect,
.pru_listen = uipc_listen,
.pru_peeraddr = uipc_peeraddr,
.pru_rcvd = uipc_rcvd,
.pru_send = uipc_send,
.pru_sense = uipc_sense,
.pru_shutdown = uipc_shutdown,
.pru_sockaddr = uipc_sockaddr,
.pru_sosend = sosend,
.pru_soreceive = soreceive,
};
int
uipc_ctloutput(struct socket *so, struct sockopt *sopt)
{
struct unpcb *unp = sotounpcb(so);
int error = 0;
pid_t peerpid;
struct socket *peerso;
switch (sopt->sopt_dir) {
case SOPT_GET:
switch (sopt->sopt_name) {
case LOCAL_PEERCRED:
if (unp->unp_flags & UNP_HAVEPC) {
error = sooptcopyout(sopt, &unp->unp_peercred,
sizeof (unp->unp_peercred));
} else {
if (so->so_type == SOCK_STREAM)
error = ENOTCONN;
else
error = EINVAL;
}
break;
case LOCAL_PEERPID:
case LOCAL_PEEREPID:
if (unp->unp_conn == NULL) {
error = ENOTCONN;
break;
}
peerso = unp->unp_conn->unp_socket;
if (peerso == NULL)
panic("peer is connected but has no socket?");
unp_get_locks_in_order(so, peerso);
if (sopt->sopt_name == LOCAL_PEEREPID &&
peerso->so_flags & SOF_DELEGATED)
peerpid = peerso->e_pid;
else
peerpid = peerso->last_pid;
socket_unlock(peerso, 1);
error = sooptcopyout(sopt, &peerpid, sizeof (peerpid));
break;
case LOCAL_PEERUUID:
case LOCAL_PEEREUUID:
if (unp->unp_conn == NULL) {
error = ENOTCONN;
break;
}
peerso = unp->unp_conn->unp_socket;
if (peerso == NULL)
panic("peer is connected but has no socket?");
unp_get_locks_in_order(so, peerso);
if (sopt->sopt_name == LOCAL_PEEREUUID &&
peerso->so_flags & SOF_DELEGATED)
error = sooptcopyout(sopt, &peerso->e_uuid,
sizeof (peerso->e_uuid));
else
error = sooptcopyout(sopt, &peerso->last_uuid,
sizeof (peerso->last_uuid));
socket_unlock(peerso, 1);
break;
default:
error = EOPNOTSUPP;
break;
}
break;
case SOPT_SET:
default:
error = EOPNOTSUPP;
break;
}
return (error);
}
/*
* Both send and receive buffers are allocated PIPSIZ bytes of buffering
* for stream sockets, although the total for sender and receiver is
* actually only PIPSIZ.
* Datagram sockets really use the sendspace as the maximum datagram size,
* and don't really want to reserve the sendspace. Their recvspace should
* be large enough for at least one max-size datagram plus address.
*/
#ifndef PIPSIZ
#define PIPSIZ 8192
#endif
static u_int32_t unpst_sendspace = PIPSIZ;
static u_int32_t unpst_recvspace = PIPSIZ;
static u_int32_t unpdg_sendspace = 2*1024; /* really max datagram size */
static u_int32_t unpdg_recvspace = 4*1024;
static int unp_rights; /* file descriptors in flight */
static int unp_disposed; /* discarded file descriptors */
SYSCTL_DECL(_net_local_stream);
SYSCTL_INT(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW | CTLFLAG_LOCKED,
&unpst_sendspace, 0, "");
SYSCTL_INT(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW | CTLFLAG_LOCKED,
&unpst_recvspace, 0, "");
SYSCTL_INT(_net_local_stream, OID_AUTO, tracemdns, CTLFLAG_RW | CTLFLAG_LOCKED,
&unpst_tracemdns, 0, "");
SYSCTL_DECL(_net_local_dgram);
SYSCTL_INT(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW | CTLFLAG_LOCKED,
&unpdg_sendspace, 0, "");
SYSCTL_INT(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW | CTLFLAG_LOCKED,
&unpdg_recvspace, 0, "");
SYSCTL_DECL(_net_local);
SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD | CTLFLAG_LOCKED, &unp_rights, 0, "");
/*
* Returns: 0 Success
* ENOBUFS
* soreserve:ENOBUFS
*/
static int
unp_attach(struct socket *so)
{
struct unpcb *unp;
int error = 0;
if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
switch (so->so_type) {
case SOCK_STREAM:
error = soreserve(so, unpst_sendspace, unpst_recvspace);
break;
case SOCK_DGRAM:
error = soreserve(so, unpdg_sendspace, unpdg_recvspace);
break;
default:
panic("unp_attach");
}
if (error)
return (error);
}
unp = (struct unpcb *)zalloc(unp_zone);
if (unp == NULL)
return (ENOBUFS);
bzero(unp, sizeof (*unp));
lck_mtx_init(&unp->unp_mtx,
unp_mtx_grp, unp_mtx_attr);
lck_rw_lock_exclusive(unp_list_mtx);
LIST_INIT(&unp->unp_refs);
unp->unp_socket = so;
unp->unp_gencnt = ++unp_gencnt;
unp_count++;
LIST_INSERT_HEAD(so->so_type == SOCK_DGRAM ?
&unp_dhead : &unp_shead, unp, unp_link);
lck_rw_done(unp_list_mtx);
so->so_pcb = (caddr_t)unp;
/*
* Mark AF_UNIX socket buffers accordingly so that:
*
* a. In the SOCK_STREAM case, socket buffer append won't fail due to
* the lack of space; this essentially loosens the sbspace() check,
* since there is disconnect between sosend() and uipc_send() with
* respect to flow control that might result in our dropping the
* data in uipc_send(). By setting this, we allow for slightly
* more records to be appended to the receiving socket to avoid
* losing data (which we can't afford in the SOCK_STREAM case).
* Flow control still takes place since we adjust the sender's
* hiwat during each send. This doesn't affect the SOCK_DGRAM
* case and append would still fail when the queue overflows.
*
* b. In the presence of control messages containing internalized
* file descriptors, the append routines will not free them since
* we'd need to undo the work first via unp_dispose().
*/
so->so_rcv.sb_flags |= SB_UNIX;
so->so_snd.sb_flags |= SB_UNIX;
return (0);
}
static void
unp_detach(struct unpcb *unp)
{
int so_locked = 1;
lck_rw_lock_exclusive(unp_list_mtx);
LIST_REMOVE(unp, unp_link);
--unp_count;
++unp_gencnt;
lck_rw_done(unp_list_mtx);
if (unp->unp_vnode) {
struct vnode *tvp = NULL;
socket_unlock(unp->unp_socket, 0);
/* Holding unp_connect_lock will avoid a race between
* a thread closing the listening socket and a thread
* connecting to it.
*/
lck_mtx_lock(unp_connect_lock);
socket_lock(unp->unp_socket, 0);
if (unp->unp_vnode) {
tvp = unp->unp_vnode;
unp->unp_vnode->v_socket = NULL;
unp->unp_vnode = NULL;
}
lck_mtx_unlock(unp_connect_lock);
if (tvp != NULL)
vnode_rele(tvp); /* drop the usecount */
}
if (unp->unp_conn)
unp_disconnect(unp);
while (unp->unp_refs.lh_first) {
struct unpcb *unp2 = NULL;
/* This datagram socket is connected to one or more
* sockets. In order to avoid a race condition between removing
* this reference and closing the connected socket, we need
* to check disconnect_in_progress
*/
if (so_locked == 1) {
socket_unlock(unp->unp_socket, 0);
so_locked = 0;
}
lck_mtx_lock(unp_disconnect_lock);
while (disconnect_in_progress != 0) {
(void)msleep((caddr_t)&disconnect_in_progress, unp_disconnect_lock,
PSOCK, "disconnect", NULL);
}
disconnect_in_progress = 1;
lck_mtx_unlock(unp_disconnect_lock);
/* Now we are sure that any unpcb socket disconnect is not happening */
if (unp->unp_refs.lh_first != NULL) {
unp2 = unp->unp_refs.lh_first;
socket_lock(unp2->unp_socket, 1);
}
lck_mtx_lock(unp_disconnect_lock);
disconnect_in_progress = 0;
wakeup(&disconnect_in_progress);
lck_mtx_unlock(unp_disconnect_lock);
if (unp2 != NULL) {
/* We already locked this socket and have a reference on it */
unp_drop(unp2, ECONNRESET);
socket_unlock(unp2->unp_socket, 1);
}
}
if (so_locked == 0) {
socket_lock(unp->unp_socket, 0);
so_locked = 1;
}
soisdisconnected(unp->unp_socket);
/* makes sure we're getting dealloced */
unp->unp_socket->so_flags |= SOF_PCBCLEARING;
}
/*
* Returns: 0 Success
* EAFNOSUPPORT
* EINVAL
* EADDRINUSE
* namei:??? [anything namei can return]
* vnode_authorize:??? [anything vnode_authorize can return]
*
* Notes: p at this point is the current process, as this function is
* only called by sobind().
*/
static int
unp_bind(
struct unpcb *unp,
struct sockaddr *nam,
proc_t p)
{
struct sockaddr_un *soun = (struct sockaddr_un *)nam;
struct vnode *vp, *dvp;
struct vnode_attr va;
vfs_context_t ctx = vfs_context_current();
int error, namelen;
struct nameidata nd;
struct socket *so = unp->unp_socket;
char buf[SOCK_MAXADDRLEN];
if (nam->sa_family != 0 && nam->sa_family != AF_UNIX) {
return (EAFNOSUPPORT);
}
/*
* Check if the socket is already bound to an address
*/
if (unp->unp_vnode != NULL)
return (EINVAL);
/*
* Check if the socket may have been shut down
*/
if ((so->so_state & (SS_CANTRCVMORE | SS_CANTSENDMORE)) ==
(SS_CANTRCVMORE | SS_CANTSENDMORE))
return (EINVAL);