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uipc_usrreq.c
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uipc_usrreq.c
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/*
* Copyright (c) 2000-2021 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 <os/log.h>
#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>
#include <kern/task.h>
#include <net/sockaddr_utils.h>
#if __has_ptrcheck
#include <machine/trap.h>
#endif /* __has_ptrcheck */
#if CONFIG_MACF
#include <security/mac_framework.h>
#endif /* CONFIG_MACF */
#include <mach/vm_param.h>
#ifndef ROUNDUP64
#define ROUNDUP64(x) P2ROUNDUP((x), sizeof (u_int64_t))
#endif
#ifndef ADVANCE64
#define ADVANCE64(p, n) (void*)((char *)(p) + ROUNDUP64(n))
#endif
/*
* Maximum number of FDs that can be passed in an mbuf
*/
#define UIPC_MAX_CMSG_FD 512
ZONE_DEFINE_TYPE(unp_zone, "unpzone", struct unpcb, ZC_NONE);
static unp_gen_t unp_gencnt;
static u_int unp_count;
static LCK_ATTR_DECLARE(unp_mtx_attr, 0, 0);
static LCK_GRP_DECLARE(unp_mtx_grp, "unp_list");
static LCK_RW_DECLARE_ATTR(unp_list_mtx, &unp_mtx_grp, &unp_mtx_attr);
static LCK_MTX_DECLARE_ATTR(unp_disconnect_lock, &unp_mtx_grp, &unp_mtx_attr);
static LCK_MTX_DECLARE_ATTR(unp_connect_lock, &unp_mtx_grp, &unp_mtx_attr);
static LCK_MTX_DECLARE_ATTR(uipc_lock, &unp_mtx_grp, &unp_mtx_attr);
static u_int disconnect_in_progress;
static struct unp_head unp_shead, unp_dhead;
static int unp_defer;
static thread_call_t unp_gc_tcall;
static LIST_HEAD(, fileglob) unp_msghead = LIST_HEAD_INITIALIZER(unp_msghead);
SYSCTL_DECL(_net_local);
static int unp_rights; /* file descriptors in flight */
static int unp_disposed; /* discarded file descriptors */
SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD | CTLFLAG_LOCKED, &unp_rights, 0, "");
#define ULEF_CONNECTION 0x01
uint32_t unp_log_enable_flags = 0;
SYSCTL_UINT(_net_local, OID_AUTO, log, CTLFLAG_RD | CTLFLAG_LOCKED,
&unp_log_enable_flags, 0, "");
/*
* 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 = {
.sa_len = sizeof(struct sockaddr),
.sa_family = AF_LOCAL,
.sa_data = {
0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 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);
static void unp_gc(thread_call_param_t arg0, thread_call_param_t arg1);
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);
__startup_func
static void
unp_gc_setup(void)
{
unp_gc_tcall = thread_call_allocate_with_options(unp_gc,
NULL, THREAD_CALL_PRIORITY_KERNEL,
THREAD_CALL_OPTIONS_ONCE);
}
STARTUP(THREAD_CALL, STARTUP_RANK_MIDDLE, unp_gc_setup);
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 != NULL && unp->unp_conn->unp_addr != NULL) {
*nam = dup_sockaddr(SA(unp->unp_conn->unp_addr), 1);
} else {
if (unp_log_enable_flags & ULEF_CONNECTION) {
os_log(OS_LOG_DEFAULT, "%s: peer disconnected unp_gencnt %llu",
__func__, unp->unp_gencnt);
}
*nam = dup_sockaddr(SA(&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);
struct socket *so2;
if (unp == NULL) {
return EINVAL;
}
so2 = unp->unp_conn != NULL ? unp->unp_conn->unp_socket : NULL;
if (so2 != NULL) {
unp_get_locks_in_order(so, so2);
}
if (unp->unp_conn != NULL && unp->unp_conn->unp_addr != NULL) {
*nam = dup_sockaddr(SA(unp->unp_conn->unp_addr), 1);
} else {
*nam = dup_sockaddr(SA(&sun_noname), 1);
}
if (so2 != NULL) {
socket_unlock(so2, 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;
if (sb_notify(&so2->so_snd)) {
sowakeup(so2, &so2->so_snd, so);
}
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;
int32_t len = m_pktlen(m);
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) {
so->so_state &= ~SS_ISCONNECTING;
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 = SA(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;
if (sb_notify(&so2->so_rcv)) {
sowakeup(so2, &so2->so_rcv, so);
}
so2->so_tc_stats[0].rxpackets += 1;
so2->so_tc_stats[0].rxbytes += len;
} 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) {
so->so_state &= ~SS_ISCONNECTING;
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? "
"socket state: %x socket flags: %x socket flags1: %x.",
so->so_state, so->so_flags, so->so_flags1);
}
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)) {
os_log(OS_LOG_DEFAULT,
"%s[mDNSResponder] pid=%d (%s): op=0x%x",
__func__, proc_getpid(p), 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;
if (sb_notify(&so2->so_rcv)) {
sowakeup(so2, &so2->so_rcv, so);
}
so2->so_tc_stats[0].rxpackets += 1;
so2->so_tc_stats[0].rxbytes += len;
} 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");
}
so->so_tc_stats[0].txpackets += 1;
so->so_tc_stats[0].txbytes += len;
/*
* 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(SA(unp->unp_addr), 1);
} else {
*nam = dup_sockaddr(SA(&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;
proc_t p;
task_t t __single;
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;
case LOCAL_PEERTOKEN:
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);
peerpid = peerso->last_pid;
p = proc_find(peerpid);
if (p != PROC_NULL) {
t = proc_task(p);
if (t != TASK_NULL) {
audit_token_t peertoken;
mach_msg_type_number_t count = TASK_AUDIT_TOKEN_COUNT;
if (task_info(t, TASK_AUDIT_TOKEN, (task_info_t)&peertoken, &count) == KERN_SUCCESS) {
error = sooptcopyout(sopt, &peertoken, sizeof(peertoken));
} else {
error = EINVAL;
}
} else {
error = EINVAL;
}
proc_rele(p);
} else {
error = EINVAL;
}
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;
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, "");
/*
* 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:
/*
* By default soreserve() will set the low water
* mark to MCLBYTES which is too high given our
* default sendspace. Override it here to something
* sensible.
*/
so->so_snd.sb_lowat = 1;
error = soreserve(so, unpdg_sendspace, unpdg_recvspace);
break;
default:
panic("unp_attach");
}
if (error) {
return error;
}
}
unp = zalloc_flags(unp_zone, Z_WAITOK | Z_ZERO | Z_NOFAIL);
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,