/*
- * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2019 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
- * @APPLE_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. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
+ * 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,
* 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_LICENSE_HEADER_END@
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* Copyright (c) 1982, 1986, 1989, 1991, 1993
*
* 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/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/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_mtx_t *unp_mutex;
+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 */
-extern lck_mtx_t * uipc_lock;
-static struct unp_head unp_shead, unp_dhead;
+#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.
* 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 *, struct proc *);
-static int unp_connect(struct socket *,struct sockaddr *, struct proc *);
-static void unp_disconnect(struct unpcb *);
-static void unp_shutdown(struct unpcb *);
-static void unp_drop(struct unpcb *, int);
-static void unp_gc(void);
-static void unp_scan(struct mbuf *, void (*)(struct fileglob *));
-static void unp_mark(struct fileglob *);
-static void unp_discard(struct fileglob *);
-static void unp_discard_fdlocked(struct fileglob *, struct proc *);
-static int unp_internalize(struct mbuf *, struct proc *);
-static int unp_listen(struct unpcb *, struct proc *);
+static struct sockaddr sun_noname = { .sa_len = sizeof(sun_noname), .sa_family = AF_LOCAL, .sa_data = { 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)
+ if (unp == 0) {
return EINVAL;
+ }
unp_drop(unp, ECONNABORTED);
unp_detach(unp);
sofree(so);
{
struct unpcb *unp = sotounpcb(so);
- if (unp == 0)
+ if (unp == 0) {
return EINVAL;
+ }
/*
* Pass back name of connected socket,
* (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);
+ *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 struct proc *p)
+uipc_attach(struct socket *so, __unused int proto, __unused proc_t p)
{
struct unpcb *unp = sotounpcb(so);
- if (unp != 0)
+ if (unp != 0) {
return EISCONN;
+ }
return unp_attach(so);
}
static int
-uipc_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
+uipc_bind(struct socket *so, struct sockaddr *nam, proc_t p)
{
struct unpcb *unp = sotounpcb(so);
- if (unp == 0)
+ 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, struct proc *p)
+uipc_connect(struct socket *so, struct sockaddr *nam, proc_t p)
{
struct unpcb *unp = sotounpcb(so);
- if (unp == 0)
+ 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)
+ if (unp == 0) {
return EINVAL;
+ }
return unp_connect2(so1, so2);
}
{
struct unpcb *unp = sotounpcb(so);
- if (unp == 0)
+ if (unp == 0) {
return EINVAL;
+ }
+ LCK_MTX_ASSERT(&unp->unp_mtx, LCK_MTX_ASSERT_OWNED);
unp_detach(unp);
return 0;
}
{
struct unpcb *unp = sotounpcb(so);
- if (unp == 0)
+ if (unp == 0) {
return EINVAL;
+ }
unp_disconnect(unp);
return 0;
}
+/*
+ * Returns: 0 Success
+ * EINVAL
+ */
static int
-uipc_listen(struct socket *so, __unused struct proc *p)
+uipc_listen(struct socket *so, __unused proc_t p)
{
struct unpcb *unp = sotounpcb(so);
- if (unp == 0 || unp->unp_vnode == 0)
+ if (unp == 0 || unp->unp_vnode == 0) {
return EINVAL;
+ }
return unp_listen(unp, p);
}
{
struct unpcb *unp = sotounpcb(so);
- if (unp == 0)
+ if (unp == NULL) {
return EINVAL;
- if (unp->unp_conn && unp->unp_conn->unp_addr)
- *nam = dup_sockaddr((struct sockaddr *)unp->unp_conn->unp_addr,
- 1);
+ }
+ 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;
}
struct unpcb *unp = sotounpcb(so);
struct socket *so2;
- if (unp == 0)
+ if (unp == 0) {
return EINVAL;
+ }
switch (so->so_type) {
case SOCK_DGRAM:
panic("uipc_rcvd DGRAM?");
- /*NOTREACHED*/
+ /*NOTREACHED*/
case SOCK_STREAM:
-#define rcv (&so->so_rcv)
+#define rcv (&so->so_rcv)
#define snd (&so2->so_snd)
- if (unp->unp_conn == 0)
+ 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.
unp->unp_mbcnt = rcv->sb_mbcnt;
snd->sb_hiwat += unp->unp_cc - rcv->sb_cc;
unp->unp_cc = rcv->sb_cc;
- sowwakeup(so2);
+ if (sb_notify(&so2->so_snd)) {
+ sowakeup(so2, &so2->so_snd, so);
+ }
+
+ socket_unlock(so2, 1);
+
#undef snd
#undef rcv
break;
/* 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, struct proc *p)
+ struct mbuf *control, proc_t p)
{
int error = 0;
struct unpcb *unp = sotounpcb(so);
goto release;
}
- if (control && (error = unp_internalize(control, p)))
- 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:
+ case SOCK_DGRAM:
{
struct sockaddr *from;
break;
}
error = unp_connect(so, nam, p);
- if (error)
+ if (error) {
break;
+ }
} else {
if (unp->unp_conn == 0) {
error = ENOTCONN;
break;
}
}
+
so2 = unp->unp_conn->unp_socket;
- if (unp->unp_addr)
+ if (so != so2) {
+ unp_get_locks_in_order(so, so2);
+ }
+
+ if (unp->unp_addr) {
from = (struct sockaddr *)unp->unp_addr;
- else
+ } 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)) {
- sorwakeup(so2);
+ control = NULL;
+ if (sb_notify(&so2->so_rcv)) {
+ sowakeup(so2, &so2->so_rcv, so);
+ }
+ } 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 = 0;
- control = 0;
- if (nam)
+
+ m = NULL;
+ if (nam) {
unp_disconnect(unp);
+ }
break;
}
case SOCK_STREAM: {
int didreceive = 0;
-#define rcv (&so2->so_rcv)
-#define snd (&so->so_snd)
+#define rcv (&so2->so_rcv)
+#define snd (&so->so_snd)
/* Connect if not connected yet. */
/*
* Note: A better implementation would complain
if ((so->so_state & SS_ISCONNECTED) == 0) {
if (nam) {
error = unp_connect(so, nam, p);
- if (error)
- break; /* XXX */
+ if (error) {
+ break; /* XXX */
+ }
} else {
error = ENOTCONN;
break;
error = EPIPE;
break;
}
- if (unp->unp_conn == 0)
+ if (unp->unp_conn == 0) {
panic("uipc_send connected but no connection?");
+ }
+
so2 = unp->unp_conn->unp_socket;
- /*
- * Send to paired receive port, and then reduce
- * send buffer hiwater marks to maintain backpressure.
- * Wake up readers.
+ 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 ((control && sbappendcontrol(rcv, m, control, NULL)) ||
- sbappend(rcv, m)) {
- didreceive = 1;
+
+ if ((so->so_state & SS_CANTSENDMORE)) {
+ error = EPIPE;
+ socket_unlock(so2, 1);
+ break;
}
- snd->sb_mbmax -=
- rcv->sb_mbcnt - unp->unp_conn->unp_mbcnt;
+
+ 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;
- snd->sb_hiwat -= rcv->sb_cc - unp->unp_conn->unp_cc;
+ 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)
- sorwakeup(so2);
- m = 0;
- control = 0;
+ if (didreceive) {
+ control = NULL;
+ if (sb_notify(&so2->so_rcv)) {
+ sowakeup(so2, &so2->so_rcv, so);
+ }
+ } 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;
+ }
+ break;
default:
panic("uipc_send unknown socktype");
unp_shutdown(unp);
}
- if (control && error != 0)
+ if (control && error != 0) {
+ socket_unlock(so, 0);
unp_dispose(control);
+ socket_lock(so, 0);
+ }
release:
- if (control)
+ if (control) {
m_freem(control);
- if (m)
+ }
+ if (m) {
m_freem(m);
+ }
return error;
}
static int
-uipc_sense(struct socket *so, struct stat *sb)
+uipc_sense(struct socket *so, void *ub, int isstat64)
{
struct unpcb *unp = sotounpcb(so);
struct socket *so2;
+ blksize_t blksize;
- if (unp == 0)
+ if (unp == 0) {
return EINVAL;
- sb->st_blksize = so->so_snd.sb_hiwat;
+ }
+
+ blksize = so->so_snd.sb_hiwat;
if (so->so_type == SOCK_STREAM && unp->unp_conn != 0) {
so2 = unp->unp_conn->unp_socket;
- sb->st_blksize += so2->so_rcv.sb_cc;
+ blksize += so2->so_rcv.sb_cc;
}
- sb->st_dev = NODEV;
- if (unp->unp_ino == 0)
+ if (unp->unp_ino == 0) {
unp->unp_ino = unp_ino++;
- sb->st_ino = unp->unp_ino;
- return (0);
+ }
+
+ 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)
+ 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 == 0)
+ if (unp == NULL) {
return EINVAL;
- if (unp->unp_addr)
+ }
+ 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 = {
- uipc_abort, uipc_accept, uipc_attach, uipc_bind, uipc_connect,
- uipc_connect2, pru_control_notsupp, uipc_detach, uipc_disconnect,
- uipc_listen, uipc_peeraddr, uipc_rcvd, pru_rcvoob_notsupp,
- uipc_send, uipc_sense, uipc_shutdown, uipc_sockaddr,
- sosend, soreceive, pru_sopoll_notsupp
+ .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)
+uipc_ctloutput(struct socket *so, struct sockopt *sopt)
{
struct unpcb *unp = sotounpcb(so);
- int error;
+ 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)
+ if (unp->unp_flags & UNP_HAVEPC) {
error = sooptcopyout(sopt, &unp->unp_peercred,
sizeof(unp->unp_peercred));
- else {
- if (so->so_type == SOCK_STREAM)
+ } else {
+ if (so->so_type == SOCK_STREAM) {
error = ENOTCONN;
- else
+ } 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;
error = EOPNOTSUPP;
break;
}
- return (error);
+
+ return error;
}
-
+
/*
* Both send and receive buffers are allocated PIPSIZ bytes of buffering
* for stream sockets, although the total for sender and receiver is
* be large enough for at least one max-size datagram plus address.
*/
#ifndef PIPSIZ
-#define PIPSIZ 8192
+#define PIPSIZ 8192
#endif
-static u_long unpst_sendspace = PIPSIZ;
-static u_long unpst_recvspace = PIPSIZ;
-static u_long unpdg_sendspace = 2*1024; /* really max datagram size */
-static u_long unpdg_recvspace = 4*1024;
+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_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,
- &unpst_sendspace, 0, "");
-SYSCTL_INT(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW,
- &unpst_recvspace, 0, "");
+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,
- &unpdg_sendspace, 0, "");
-SYSCTL_INT(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW,
- &unpdg_recvspace, 0, "");
+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, &unp_rights, 0, "");
+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)
{
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;
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_lock(unp_mutex);
+ 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);
+ 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;
- lck_mtx_unlock(unp_mutex);
- return (0);
+ /*
+ * 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)
{
- lck_mtx_assert(unp_mutex, LCK_MTX_ASSERT_OWNED);
+ int so_locked = 1;
+
+ lck_rw_lock_exclusive(unp_list_mtx);
LIST_REMOVE(unp, unp_link);
- unp->unp_gencnt = ++unp_gencnt;
--unp_count;
+ ++unp_gencnt;
+ lck_rw_done(unp_list_mtx);
if (unp->unp_vnode) {
- struct vnode *tvp = unp->unp_vnode;
- unp->unp_vnode->v_socket = 0;
- unp->unp_vnode = 0;
- vnode_rele(tvp); /* drop the usecount */
+ 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)
+ if (unp->unp_conn) {
unp_disconnect(unp);
- while (unp->unp_refs.lh_first)
- unp_drop(unp->unp_refs.lh_first, ECONNRESET);
- soisdisconnected(unp->unp_socket);
- unp->unp_socket->so_flags |= SOF_PCBCLEARING; /* makes sure we're getting dealloced */
- unp->unp_socket->so_pcb = 0;
- if (unp_rights) {
- /*
- * Normally the receive buffer is flushed later,
- * in sofree, but if our receive buffer holds references
- * to descriptors that are now garbage, we will dispose
- * of those descriptor references after the garbage collector
- * gets them (resulting in a "panic: closef: count < 0").
+ }
+ 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
*/
- sorflush(unp->unp_socket);
- unp_gc();
+ 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;
}
- if (unp->unp_addr)
- FREE(unp->unp_addr, M_SONAME);
- zfree(unp_zone, unp);
+ 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,
- struct proc *p)
+ proc_t p)
{
struct sockaddr_un *soun = (struct sockaddr_un *)nam;
struct vnode *vp, *dvp;
struct vnode_attr va;
- struct vfs_context context;
+ vfs_context_t ctx = vfs_context_current();
int error, namelen;
struct nameidata nd;
+ struct socket *so = unp->unp_socket;
char buf[SOCK_MAXADDRLEN];
- context.vc_proc = p;
- context.vc_ucred = p->p_ucred; /* XXX kauth_cred_get() ??? proxy */
+ 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;
+ }
- if (unp->unp_vnode != NULL)
- return (EINVAL);
namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path);
- if (namelen <= 0)
+ if (namelen <= 0) {
+ return EINVAL;
+ }
+ /*
+ * Note: sun_path is not a zero terminated "C" string
+ */
+ if (namelen >= SOCK_MAXADDRLEN) {
return EINVAL;
- strncpy(buf, soun->sun_path, namelen);
- buf[namelen] = 0; /* null-terminate the string */
- NDINIT(&nd, CREATE, FOLLOW | LOCKPARENT, UIO_SYSSPACE32,
- CAST_USER_ADDR_T(buf), &context);
-/* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */
+ }
+ bcopy(soun->sun_path, buf, namelen);
+ buf[namelen] = 0;
+
+ socket_unlock(so, 0);
+
+ NDINIT(&nd, CREATE, OP_MKFIFO, FOLLOW | LOCKPARENT, UIO_SYSSPACE,
+ CAST_USER_ADDR_T(buf), ctx);
+ /* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */
error = namei(&nd);
if (error) {
- return (error);
+ socket_lock(so, 0);
+ return error;
}
dvp = nd.ni_dvp;
vp = nd.ni_vp;
if (vp != NULL) {
- /*
+ /*
* need to do this before the vnode_put of dvp
* since we may have to release an fs_nodelock
*/
vnode_put(dvp);
vnode_put(vp);
- return (EADDRINUSE);
+ socket_lock(so, 0);
+ return EADDRINUSE;
}
+ VATTR_INIT(&va);
+ VATTR_SET(&va, va_type, VSOCK);
+ VATTR_SET(&va, va_mode, (ACCESSPERMS & ~p->p_fd->fd_cmask));
+
+#if CONFIG_MACF
+ error = mac_vnode_check_create(ctx,
+ nd.ni_dvp, &nd.ni_cnd, &va);
+
+ if (error == 0)
+#endif /* CONFIG_MACF */
+#if CONFIG_MACF_SOCKET_SUBSET
+ error = mac_vnode_check_uipc_bind(ctx,
+ nd.ni_dvp, &nd.ni_cnd, &va);
+
+ if (error == 0)
+#endif /* MAC_SOCKET_SUBSET */
/* authorize before creating */
- error = vnode_authorize(dvp, NULL, KAUTH_VNODE_ADD_FILE, &context);
+ error = vnode_authorize(dvp, NULL, KAUTH_VNODE_ADD_FILE, ctx);
if (!error) {
- VATTR_INIT(&va);
- VATTR_SET(&va, va_type, VSOCK);
- VATTR_SET(&va, va_mode, (ACCESSPERMS & ~p->p_fd->fd_cmask));
-
/* create the socket */
- error = vn_create(dvp, &vp, &nd.ni_cnd, &va, 0, &context);
+ error = vn_create(dvp, &vp, &nd, &va, 0, 0, NULL, ctx);
}
-
+
nameidone(&nd);
vnode_put(dvp);
if (error) {
- return (error);
+ socket_lock(so, 0);
+ return error;
+ }
+
+ socket_lock(so, 0);
+
+ if (unp->unp_vnode != NULL) {
+ vnode_put(vp); /* drop the iocount */
+ return EINVAL;
+ }
+
+ error = vnode_ref(vp); /* gain a longterm reference */
+ if (error) {
+ vnode_put(vp); /* drop the iocount */
+ return error;
}
- vnode_ref(vp); /* gain a longterm reference */
+
vp->v_socket = unp->unp_socket;
unp->unp_vnode = vp;
unp->unp_addr = (struct sockaddr_un *)dup_sockaddr(nam, 1);
- vnode_put(vp); /* drop the iocount */
+ vnode_put(vp); /* drop the iocount */
- return (0);
+ return 0;
}
+
+/*
+ * Returns: 0 Success
+ * EAFNOSUPPORT Address family not supported
+ * EINVAL Invalid argument
+ * ENOTSOCK Not a socket
+ * ECONNREFUSED Connection refused
+ * EPROTOTYPE Protocol wrong type for socket
+ * EISCONN Socket is connected
+ * unp_connect2:EPROTOTYPE Protocol wrong type for socket
+ * unp_connect2:EINVAL Invalid argument
+ * 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 sosend(), sendfile(), and soconnectlock().
+ */
static int
-unp_connect(
- struct socket *so,
- struct sockaddr *nam,
- struct proc *p)
+unp_connect(struct socket *so, struct sockaddr *nam, __unused proc_t p)
{
struct sockaddr_un *soun = (struct sockaddr_un *)nam;
struct vnode *vp;
- struct socket *so2, *so3;
+ struct socket *so2, *so3, *list_so = NULL;
struct unpcb *unp, *unp2, *unp3;
- struct vfs_context context;
+ vfs_context_t ctx = vfs_context_current();
int error, len;
struct nameidata nd;
char buf[SOCK_MAXADDRLEN];
- context.vc_proc = p;
- context.vc_ucred = p->p_ucred; /* XXX kauth_cred_get() ??? proxy */
+ if (nam->sa_family != 0 && nam->sa_family != AF_UNIX) {
+ return EAFNOSUPPORT;
+ }
+
+ unp = sotounpcb(so);
so2 = so3 = NULL;
len = nam->sa_len - offsetof(struct sockaddr_un, sun_path);
- if (len <= 0)
+ if (len <= 0) {
+ return EINVAL;
+ }
+ /*
+ * Note: sun_path is not a zero terminated "C" string
+ */
+ if (len >= SOCK_MAXADDRLEN) {
return EINVAL;
- strncpy(buf, soun->sun_path, len);
+ }
+ bcopy(soun->sun_path, buf, len);
buf[len] = 0;
- NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE32, CAST_USER_ADDR_T(buf), &context);
+ socket_unlock(so, 0);
+
+ NDINIT(&nd, LOOKUP, OP_LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
+ CAST_USER_ADDR_T(buf), ctx);
error = namei(&nd);
if (error) {
- return (error);
+ socket_lock(so, 0);
+ return error;
}
nameidone(&nd);
vp = nd.ni_vp;
if (vp->v_type != VSOCK) {
error = ENOTSOCK;
- goto bad;
+ socket_lock(so, 0);
+ goto out;
}
- error = vnode_authorize(vp, NULL, KAUTH_VNODE_WRITE_DATA, &context);
- if (error)
- goto bad;
- so2 = vp->v_socket;
- if (so2 == 0) {
+#if CONFIG_MACF_SOCKET_SUBSET
+ error = mac_vnode_check_uipc_connect(ctx, vp, so);
+ if (error) {
+ socket_lock(so, 0);
+ goto out;
+ }
+#endif /* MAC_SOCKET_SUBSET */
+
+ error = vnode_authorize(vp, NULL, KAUTH_VNODE_WRITE_DATA, ctx);
+ if (error) {
+ socket_lock(so, 0);
+ goto out;
+ }
+
+ lck_mtx_lock(unp_connect_lock);
+
+ if (vp->v_socket == 0) {
+ lck_mtx_unlock(unp_connect_lock);
error = ECONNREFUSED;
- goto bad;
+ socket_lock(so, 0);
+ goto out;
}
- /* make sure the socket can't go away while we're connecting */
- so2->so_usecount++;
+ socket_lock(vp->v_socket, 1); /* Get a reference on the listening socket */
+ so2 = vp->v_socket;
+ lck_mtx_unlock(unp_connect_lock);
- if (so->so_type != so2->so_type) {
- error = EPROTOTYPE;
- goto bad;
+
+ if (so2->so_pcb == NULL) {
+ error = ECONNREFUSED;
+ if (so != so2) {
+ socket_unlock(so2, 1);
+ socket_lock(so, 0);
+ } else {
+ /* Release the reference held for the listen socket */
+ VERIFY(so2->so_usecount > 0);
+ so2->so_usecount--;
+ }
+ goto out;
+ }
+
+ if (so < so2) {
+ socket_unlock(so2, 0);
+ socket_lock(so, 0);
+ socket_lock(so2, 0);
+ } else if (so > so2) {
+ socket_lock(so, 0);
}
-
/*
* Check if socket was connected while we were trying to
- * acquire the funnel.
+ * get the socket locks in order.
* XXX - probably shouldn't return an error for SOCK_DGRAM
*/
if ((so->so_state & SS_ISCONNECTED) != 0) {
error = EISCONN;
- goto bad;
+ goto decref_out;
}
-
- if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
+
+ if (so->so_type != so2->so_type) {
+ error = EPROTOTYPE;
+ goto decref_out;
+ }
+
+ if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
+ /* Release the incoming socket but keep a reference */
+ socket_unlock(so, 0);
+
if ((so2->so_options & SO_ACCEPTCONN) == 0 ||
(so3 = sonewconn(so2, 0, nam)) == 0) {
error = ECONNREFUSED;
- goto bad;
+ if (so != so2) {
+ socket_unlock(so2, 1);
+ socket_lock(so, 0);
+ } else {
+ socket_lock(so, 0);
+ /* Release the reference held for
+ * listen socket.
+ */
+ VERIFY(so2->so_usecount > 0);
+ so2->so_usecount--;
+ }
+ goto out;
}
- unp = sotounpcb(so);
unp2 = sotounpcb(so2);
unp3 = sotounpcb(so3);
- if (unp2->unp_addr)
+ if (unp2->unp_addr) {
unp3->unp_addr = (struct sockaddr_un *)
- dup_sockaddr((struct sockaddr *)
- unp2->unp_addr, 1);
+ dup_sockaddr((struct sockaddr *)unp2->unp_addr, 1);
+ }
/*
* unp_peercred management:
* from its process structure at the time of connect()
* (which is now).
*/
- cru2x(p->p_ucred, &unp3->unp_peercred);
+ cru2x(vfs_context_ucred(ctx), &unp3->unp_peercred);
unp3->unp_flags |= UNP_HAVEPC;
/*
* The receiver's (server's) credentials are copied
*/
KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED,
("unp_connect: listener without cached peercred"));
+
+ /* Here we need to have both so and so2 locks and so2
+ * is already locked. Lock ordering is required.
+ */
+ if (so < so2) {
+ socket_unlock(so2, 0);
+ socket_lock(so, 0);
+ socket_lock(so2, 0);
+ } else {
+ socket_lock(so, 0);
+ }
+
+ /* Check again if the socket state changed when its lock was released */
+ if ((so->so_state & SS_ISCONNECTED) != 0) {
+ error = EISCONN;
+ socket_unlock(so2, 1);
+ socket_lock(so3, 0);
+ sofreelastref(so3, 1);
+ goto out;
+ }
memcpy(&unp->unp_peercred, &unp2->unp_peercred,
sizeof(unp->unp_peercred));
unp->unp_flags |= UNP_HAVEPC;
- so2->so_usecount--; /* drop reference taken on so2 */
+#if CONFIG_MACF_SOCKET
+ /* XXXMAC: recursive lock: SOCK_LOCK(so); */
+ mac_socketpeer_label_associate_socket(so, so3);
+ mac_socketpeer_label_associate_socket(so3, so);
+ /* XXXMAC: SOCK_UNLOCK(so); */
+#endif /* MAC_SOCKET */
+
+ /* Hold the reference on listening socket until the end */
+ socket_unlock(so2, 0);
+ list_so = so2;
+
+ /* Lock ordering doesn't matter because so3 was just created */
+ socket_lock(so3, 1);
so2 = so3;
- so3->so_usecount++; /* make sure we keep it around */
+
+ /*
+ * Enable tracing for mDNSResponder endpoints. (The use
+ * of sizeof instead of strlen below takes the null
+ * terminating character into account.)
+ */
+ if (unpst_tracemdns &&
+ !strncmp(soun->sun_path, MDNSRESPONDER_PATH,
+ sizeof(MDNSRESPONDER_PATH))) {
+ unp->unp_flags |= UNP_TRACE_MDNS;
+ unp2->unp_flags |= UNP_TRACE_MDNS;
+ }
}
+
error = unp_connect2(so, so2);
-bad:
- if (so2 != NULL)
- so2->so_usecount--; /* release count on socket */
+
+decref_out:
+ if (so2 != NULL) {
+ if (so != so2) {
+ socket_unlock(so2, 1);
+ } else {
+ /* Release the extra reference held for the listen socket.
+ * This is possible only for SOCK_DGRAM sockets. We refuse
+ * connecting to the same socket for SOCK_STREAM sockets.
+ */
+ VERIFY(so2->so_usecount > 0);
+ so2->so_usecount--;
+ }
+ }
+
+ if (list_so != NULL) {
+ socket_lock(list_so, 0);
+ socket_unlock(list_so, 1);
+ }
+
+out:
+ LCK_MTX_ASSERT(&unp->unp_mtx, LCK_MTX_ASSERT_OWNED);
vnode_put(vp);
- return (error);
+ return error;
}
+/*
+ * Returns: 0 Success
+ * EPROTOTYPE Protocol wrong type for socket
+ * EINVAL Invalid argument
+ */
int
-unp_connect2(
- struct socket *so,
- struct socket *so2)
+unp_connect2(struct socket *so, struct socket *so2)
{
struct unpcb *unp = sotounpcb(so);
struct unpcb *unp2;
- if (so2->so_type != so->so_type)
- return (EPROTOTYPE);
+ if (so2->so_type != so->so_type) {
+ return EPROTOTYPE;
+ }
+
unp2 = sotounpcb(so2);
+ LCK_MTX_ASSERT(&unp->unp_mtx, LCK_MTX_ASSERT_OWNED);
+ LCK_MTX_ASSERT(&unp2->unp_mtx, LCK_MTX_ASSERT_OWNED);
+
/* Verify both sockets are still opened */
- if (unp == 0 || unp2 == 0)
- return (EINVAL);
+ if (unp == 0 || unp2 == 0) {
+ return EINVAL;
+ }
unp->unp_conn = unp2;
- switch (so->so_type) {
+ so2->so_usecount++;
+ switch (so->so_type) {
case SOCK_DGRAM:
LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink);
- soisconnected(so);
+
+ if (so != so2) {
+ /* Avoid lock order reversals due to drop/acquire in soisconnected. */
+ /* Keep an extra reference on so2 that will be dropped
+ * soon after getting the locks in order
+ */
+ socket_unlock(so2, 0);
+ soisconnected(so);
+ unp_get_locks_in_order(so, so2);
+ VERIFY(so2->so_usecount > 0);
+ so2->so_usecount--;
+ } else {
+ soisconnected(so);
+ }
+
break;
case SOCK_STREAM:
- /* This takes care of socketpair */
- if (!(unp->unp_flags & UNP_HAVEPC) && !(unp2->unp_flags & UNP_HAVEPC)) {
- cru2x(kauth_cred_get(), &unp->unp_peercred);
- unp->unp_flags |= UNP_HAVEPC;
-
- cru2x(kauth_cred_get(), &unp2->unp_peercred);
- unp2->unp_flags |= UNP_HAVEPC;
- }
+ /* This takes care of socketpair */
+ if (!(unp->unp_flags & UNP_HAVEPC) &&
+ !(unp2->unp_flags & UNP_HAVEPC)) {
+ cru2x(kauth_cred_get(), &unp->unp_peercred);
+ unp->unp_flags |= UNP_HAVEPC;
+
+ cru2x(kauth_cred_get(), &unp2->unp_peercred);
+ unp2->unp_flags |= UNP_HAVEPC;
+ }
unp2->unp_conn = unp;
- soisconnected(so);
+ so->so_usecount++;
+
+ /* Avoid lock order reversals due to drop/acquire in soisconnected. */
+ socket_unlock(so, 0);
soisconnected(so2);
+
+ /* Keep an extra reference on so2, that will be dropped soon after
+ * getting the locks in order again.
+ */
+ socket_unlock(so2, 0);
+
+ socket_lock(so, 0);
+ soisconnected(so);
+
+ unp_get_locks_in_order(so, so2);
+ /* Decrement the extra reference left before */
+ VERIFY(so2->so_usecount > 0);
+ so2->so_usecount--;
break;
default:
- panic("unp_connect2");
+ panic("unknown socket type %d in unp_connect2", so->so_type);
}
- return (0);
+ LCK_MTX_ASSERT(&unp->unp_mtx, LCK_MTX_ASSERT_OWNED);
+ LCK_MTX_ASSERT(&unp2->unp_mtx, LCK_MTX_ASSERT_OWNED);
+ return 0;
}
static void
unp_disconnect(struct unpcb *unp)
{
- struct unpcb *unp2 = unp->unp_conn;
+ struct unpcb *unp2 = NULL;
+ struct socket *so2 = NULL, *so;
+ struct socket *waitso;
+ int so_locked = 1, strdisconn = 0;
- if (unp2 == 0)
+ so = unp->unp_socket;
+ if (unp->unp_conn == NULL) {
return;
- lck_mtx_assert(unp_mutex, LCK_MTX_ASSERT_OWNED);
- unp->unp_conn = 0;
- switch (unp->unp_socket->so_type) {
+ }
+ lck_mtx_lock(unp_disconnect_lock);
+ while (disconnect_in_progress != 0) {
+ if (so_locked == 1) {
+ socket_unlock(so, 0);
+ so_locked = 0;
+ }
+ (void)msleep((caddr_t)&disconnect_in_progress, unp_disconnect_lock,
+ PSOCK, "disconnect", NULL);
+ }
+ disconnect_in_progress = 1;
+ lck_mtx_unlock(unp_disconnect_lock);
+
+ if (so_locked == 0) {
+ socket_lock(so, 0);
+ so_locked = 1;
+ }
+ unp2 = unp->unp_conn;
+
+ if (unp2 == 0 || unp2->unp_socket == NULL) {
+ goto out;
+ }
+ so2 = unp2->unp_socket;
+
+try_again:
+ if (so == so2) {
+ if (so_locked == 0) {
+ socket_lock(so, 0);
+ }
+ waitso = so;
+ } else if (so < so2) {
+ if (so_locked == 0) {
+ socket_lock(so, 0);
+ }
+ socket_lock(so2, 1);
+ waitso = so2;
+ } else {
+ if (so_locked == 1) {
+ socket_unlock(so, 0);
+ }
+ socket_lock(so2, 1);
+ socket_lock(so, 0);
+ waitso = so;
+ }
+ so_locked = 1;
+
+ LCK_MTX_ASSERT(&unp->unp_mtx, LCK_MTX_ASSERT_OWNED);
+ LCK_MTX_ASSERT(&unp2->unp_mtx, LCK_MTX_ASSERT_OWNED);
+
+ /* Check for the UNP_DONTDISCONNECT flag, if it
+ * is set, release both sockets and go to sleep
+ */
+
+ if ((((struct unpcb *)waitso->so_pcb)->unp_flags & UNP_DONTDISCONNECT) != 0) {
+ if (so != so2) {
+ socket_unlock(so2, 1);
+ }
+ so_locked = 0;
+
+ (void)msleep(waitso->so_pcb, &unp->unp_mtx,
+ PSOCK | PDROP, "unpdisconnect", NULL);
+ goto try_again;
+ }
+
+ if (unp->unp_conn == NULL) {
+ panic("unp_conn became NULL after sleep");
+ }
+
+ unp->unp_conn = NULL;
+ VERIFY(so2->so_usecount > 0);
+ so2->so_usecount--;
+
+ if (unp->unp_flags & UNP_TRACE_MDNS) {
+ unp->unp_flags &= ~UNP_TRACE_MDNS;
+ }
+
+ switch (unp->unp_socket->so_type) {
case SOCK_DGRAM:
LIST_REMOVE(unp, unp_reflink);
unp->unp_socket->so_state &= ~SS_ISCONNECTED;
+ if (so != so2) {
+ socket_unlock(so2, 1);
+ }
break;
case SOCK_STREAM:
- soisdisconnected(unp->unp_socket);
- unp2->unp_conn = 0;
- soisdisconnected(unp2->unp_socket);
+ unp2->unp_conn = NULL;
+ VERIFY(so->so_usecount > 0);
+ so->so_usecount--;
+
+ /* Set the socket state correctly but do a wakeup later when
+ * we release all locks except the socket lock, this will avoid
+ * a deadlock.
+ */
+ unp->unp_socket->so_state &= ~(SS_ISCONNECTING | SS_ISCONNECTED | SS_ISDISCONNECTING);
+ unp->unp_socket->so_state |= (SS_CANTRCVMORE | SS_CANTSENDMORE | SS_ISDISCONNECTED);
+
+ unp2->unp_socket->so_state &= ~(SS_ISCONNECTING | SS_ISCONNECTED | SS_ISDISCONNECTING);
+ unp->unp_socket->so_state |= (SS_CANTRCVMORE | SS_CANTSENDMORE | SS_ISDISCONNECTED);
+
+ if (unp2->unp_flags & UNP_TRACE_MDNS) {
+ unp2->unp_flags &= ~UNP_TRACE_MDNS;
+ }
+
+ strdisconn = 1;
break;
+ default:
+ panic("unknown socket type %d", so->so_type);
}
+out:
+ lck_mtx_lock(unp_disconnect_lock);
+ disconnect_in_progress = 0;
+ wakeup(&disconnect_in_progress);
+ lck_mtx_unlock(unp_disconnect_lock);
+
+ if (strdisconn) {
+ socket_unlock(so, 0);
+ soisdisconnected(so2);
+ socket_unlock(so2, 1);
+
+ socket_lock(so, 0);
+ soisdisconnected(so);
+ }
+ LCK_MTX_ASSERT(&unp->unp_mtx, LCK_MTX_ASSERT_OWNED);
+ return;
}
-#ifdef notdef
-void
-unp_abort(struct unpcb *unp)
+/*
+ * unpcb_to_compat copies specific bits of a unpcb to a unpcb_compat format.
+ * The unpcb_compat data structure is passed to user space and must not change.
+ */
+static void
+unpcb_to_compat(struct unpcb *up, struct unpcb_compat *cp)
{
-
- unp_detach(unp);
-}
+#if defined(__LP64__)
+ cp->unp_link.le_next = (u_int32_t)
+ VM_KERNEL_ADDRPERM(up->unp_link.le_next);
+ cp->unp_link.le_prev = (u_int32_t)
+ VM_KERNEL_ADDRPERM(up->unp_link.le_prev);
+#else
+ cp->unp_link.le_next = (struct unpcb_compat *)
+ VM_KERNEL_ADDRPERM(up->unp_link.le_next);
+ cp->unp_link.le_prev = (struct unpcb_compat **)
+ VM_KERNEL_ADDRPERM(up->unp_link.le_prev);
#endif
+ cp->unp_socket = (_UNPCB_PTR(struct socket *))
+ VM_KERNEL_ADDRPERM(up->unp_socket);
+ cp->unp_vnode = (_UNPCB_PTR(struct vnode *))
+ VM_KERNEL_ADDRPERM(up->unp_vnode);
+ cp->unp_ino = up->unp_ino;
+ cp->unp_conn = (_UNPCB_PTR(struct unpcb_compat *))
+ VM_KERNEL_ADDRPERM(up->unp_conn);
+ cp->unp_refs = (u_int32_t)VM_KERNEL_ADDRPERM(up->unp_refs.lh_first);
+#if defined(__LP64__)
+ cp->unp_reflink.le_next =
+ (u_int32_t)VM_KERNEL_ADDRPERM(up->unp_reflink.le_next);
+ cp->unp_reflink.le_prev =
+ (u_int32_t)VM_KERNEL_ADDRPERM(up->unp_reflink.le_prev);
+#else
+ cp->unp_reflink.le_next =
+ (struct unpcb_compat *)VM_KERNEL_ADDRPERM(up->unp_reflink.le_next);
+ cp->unp_reflink.le_prev =
+ (struct unpcb_compat **)VM_KERNEL_ADDRPERM(up->unp_reflink.le_prev);
+#endif
+ cp->unp_addr = (_UNPCB_PTR(struct sockaddr_un *))
+ VM_KERNEL_ADDRPERM(up->unp_addr);
+ cp->unp_cc = up->unp_cc;
+ cp->unp_mbcnt = up->unp_mbcnt;
+ cp->unp_gencnt = up->unp_gencnt;
+}
static int
unp_pcblist SYSCTL_HANDLER_ARGS
{
+#pragma unused(oidp,arg2)
int error, i, n;
struct unpcb *unp, **unp_list;
unp_gen_t gencnt;
struct xunpgen xug;
struct unp_head *head;
- lck_mtx_lock(unp_mutex);
+ lck_rw_lock_shared(unp_list_mtx);
head = ((intptr_t)arg1 == SOCK_DGRAM ? &unp_dhead : &unp_shead);
/*
*/
if (req->oldptr == USER_ADDR_NULL) {
n = unp_count;
- req->oldidx = 2 * (sizeof xug)
- + (n + n/8) * sizeof(struct xunpcb);
- lck_mtx_unlock(unp_mutex);
+ req->oldidx = 2 * sizeof(xug) + (n + n / 8) *
+ sizeof(struct xunpcb);
+ lck_rw_done(unp_list_mtx);
return 0;
}
if (req->newptr != USER_ADDR_NULL) {
- lck_mtx_unlock(unp_mutex);
+ lck_rw_done(unp_list_mtx);
return EPERM;
}
n = unp_count;
bzero(&xug, sizeof(xug));
- xug.xug_len = sizeof xug;
+ xug.xug_len = sizeof(xug);
xug.xug_count = n;
xug.xug_gen = gencnt;
xug.xug_sogen = so_gencnt;
- error = SYSCTL_OUT(req, &xug, sizeof xug);
+ error = SYSCTL_OUT(req, &xug, sizeof(xug));
if (error) {
- lck_mtx_unlock(unp_mutex);
+ lck_rw_done(unp_list_mtx);
return error;
}
/*
* We are done if there is no pcb
*/
- if (n == 0) {
- lck_mtx_unlock(unp_mutex);
- return 0;
+ if (n == 0) {
+ lck_rw_done(unp_list_mtx);
+ return 0;
}
- MALLOC(unp_list, struct unpcb **, n * sizeof *unp_list, M_TEMP, M_WAITOK);
+ MALLOC(unp_list, struct unpcb **, n * sizeof(*unp_list),
+ M_TEMP, M_WAITOK);
if (unp_list == 0) {
- lck_mtx_unlock(unp_mutex);
+ lck_rw_done(unp_list_mtx);
return ENOMEM;
}
-
+
for (unp = head->lh_first, i = 0; unp && i < n;
- unp = unp->unp_link.le_next) {
- if (unp->unp_gencnt <= gencnt)
+ unp = unp->unp_link.le_next) {
+ if (unp->unp_gencnt <= gencnt) {
unp_list[i++] = unp;
+ }
}
- n = i; /* in case we lost some during malloc */
+ n = i; /* in case we lost some during malloc */
error = 0;
for (i = 0; i < n; i++) {
struct xunpcb xu;
bzero(&xu, sizeof(xu));
- xu.xu_len = sizeof xu;
- xu.xu_unpp = (struct unpcb_compat *)unp;
+ xu.xu_len = sizeof(xu);
+ xu.xu_unpp = (_UNPCB_PTR(struct unpcb_compat *))
+ VM_KERNEL_ADDRPERM(unp);
/*
* XXX - need more locking here to protect against
* connect/disconnect races for SMP.
*/
- if (unp->unp_addr)
- bcopy(unp->unp_addr, &xu.xu_addr,
- unp->unp_addr->sun_len);
- if (unp->unp_conn && unp->unp_conn->unp_addr)
+ if (unp->unp_addr) {
+ bcopy(unp->unp_addr, &xu.xu_au,
+ unp->unp_addr->sun_len);
+ }
+ if (unp->unp_conn && unp->unp_conn->unp_addr) {
bcopy(unp->unp_conn->unp_addr,
- &xu.xu_caddr,
- unp->unp_conn->unp_addr->sun_len);
- bcopy(unp, &xu.xu_unp, sizeof(xu.xu_unp));
+ &xu.xu_cau,
+ unp->unp_conn->unp_addr->sun_len);
+ }
+ unpcb_to_compat(unp, &xu.xu_unp);
sotoxsocket(unp->unp_socket, &xu.xu_socket);
- error = SYSCTL_OUT(req, &xu, sizeof xu);
+ error = SYSCTL_OUT(req, &xu, sizeof(xu));
}
}
if (!error) {
* might be necessary to retry.
*/
bzero(&xug, sizeof(xug));
- xug.xug_len = sizeof xug;
+ xug.xug_len = sizeof(xug);
xug.xug_gen = unp_gencnt;
xug.xug_sogen = so_gencnt;
xug.xug_count = unp_count;
- error = SYSCTL_OUT(req, &xug, sizeof xug);
+ error = SYSCTL_OUT(req, &xug, sizeof(xug));
}
FREE(unp_list, M_TEMP);
- lck_mtx_unlock(unp_mutex);
+ lck_rw_done(unp_list_mtx);
return error;
}
-SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLFLAG_RD,
- (caddr_t)(long)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb",
- "List of active local datagram sockets");
-SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLFLAG_RD,
- (caddr_t)(long)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb",
- "List of active local stream sockets");
+SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist,
+ CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED,
+ (caddr_t)(long)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb",
+ "List of active local datagram sockets");
+SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist,
+ CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED,
+ (caddr_t)(long)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb",
+ "List of active local stream sockets");
-static void
-unp_shutdown(struct unpcb *unp)
+#if !CONFIG_EMBEDDED
+
+static int
+unp_pcblist64 SYSCTL_HANDLER_ARGS
{
- struct socket *so;
+#pragma unused(oidp,arg2)
+ int error, i, n;
+ struct unpcb *unp, **unp_list;
+ unp_gen_t gencnt;
+ struct xunpgen xug;
+ struct unp_head *head;
+
+ lck_rw_lock_shared(unp_list_mtx);
+ head = ((intptr_t)arg1 == SOCK_DGRAM ? &unp_dhead : &unp_shead);
+
+ /*
+ * The process of preparing the PCB list is too time-consuming and
+ * resource-intensive to repeat twice on every request.
+ */
+ if (req->oldptr == USER_ADDR_NULL) {
+ n = unp_count;
+ req->oldidx = 2 * sizeof(xug) + (n + n / 8) *
+ (sizeof(struct xunpcb64));
+ lck_rw_done(unp_list_mtx);
+ return 0;
+ }
+
+ if (req->newptr != USER_ADDR_NULL) {
+ lck_rw_done(unp_list_mtx);
+ return EPERM;
+ }
- if (unp->unp_socket->so_type == SOCK_STREAM && unp->unp_conn &&
- (so = unp->unp_conn->unp_socket))
- socantrcvmore(so);
+ /*
+ * OK, now we're committed to doing something.
+ */
+ gencnt = unp_gencnt;
+ n = unp_count;
+
+ bzero(&xug, sizeof(xug));
+ xug.xug_len = sizeof(xug);
+ xug.xug_count = n;
+ xug.xug_gen = gencnt;
+ xug.xug_sogen = so_gencnt;
+ error = SYSCTL_OUT(req, &xug, sizeof(xug));
+ if (error) {
+ lck_rw_done(unp_list_mtx);
+ return error;
+ }
+
+ /*
+ * We are done if there is no pcb
+ */
+ if (n == 0) {
+ lck_rw_done(unp_list_mtx);
+ return 0;
+ }
+
+ MALLOC(unp_list, struct unpcb **, n * sizeof(*unp_list),
+ M_TEMP, M_WAITOK);
+ if (unp_list == 0) {
+ lck_rw_done(unp_list_mtx);
+ return ENOMEM;
+ }
+
+ for (unp = head->lh_first, i = 0; unp && i < n;
+ unp = unp->unp_link.le_next) {
+ if (unp->unp_gencnt <= gencnt) {
+ unp_list[i++] = unp;
+ }
+ }
+ n = i; /* in case we lost some during malloc */
+
+ error = 0;
+ for (i = 0; i < n; i++) {
+ unp = unp_list[i];
+ if (unp->unp_gencnt <= gencnt) {
+ struct xunpcb64 xu;
+ size_t xu_len = sizeof(struct xunpcb64);
+
+ bzero(&xu, xu_len);
+ xu.xu_len = xu_len;
+ xu.xu_unpp = (u_int64_t)VM_KERNEL_ADDRPERM(unp);
+ xu.xunp_link.le_next = (u_int64_t)
+ VM_KERNEL_ADDRPERM(unp->unp_link.le_next);
+ xu.xunp_link.le_prev = (u_int64_t)
+ VM_KERNEL_ADDRPERM(unp->unp_link.le_prev);
+ xu.xunp_socket = (u_int64_t)
+ VM_KERNEL_ADDRPERM(unp->unp_socket);
+ xu.xunp_vnode = (u_int64_t)
+ VM_KERNEL_ADDRPERM(unp->unp_vnode);
+ xu.xunp_ino = unp->unp_ino;
+ xu.xunp_conn = (u_int64_t)
+ VM_KERNEL_ADDRPERM(unp->unp_conn);
+ xu.xunp_refs = (u_int64_t)
+ VM_KERNEL_ADDRPERM(unp->unp_refs.lh_first);
+ xu.xunp_reflink.le_next = (u_int64_t)
+ VM_KERNEL_ADDRPERM(unp->unp_reflink.le_next);
+ xu.xunp_reflink.le_prev = (u_int64_t)
+ VM_KERNEL_ADDRPERM(unp->unp_reflink.le_prev);
+ xu.xunp_cc = unp->unp_cc;
+ xu.xunp_mbcnt = unp->unp_mbcnt;
+ xu.xunp_gencnt = unp->unp_gencnt;
+
+ if (unp->unp_socket) {
+ sotoxsocket64(unp->unp_socket, &xu.xu_socket);
+ }
+
+ /*
+ * XXX - need more locking here to protect against
+ * connect/disconnect races for SMP.
+ */
+ if (unp->unp_addr) {
+ bcopy(unp->unp_addr, &xu.xu_au,
+ unp->unp_addr->sun_len);
+ }
+ if (unp->unp_conn && unp->unp_conn->unp_addr) {
+ bcopy(unp->unp_conn->unp_addr,
+ &xu.xu_cau,
+ unp->unp_conn->unp_addr->sun_len);
+ }
+
+ error = SYSCTL_OUT(req, &xu, xu_len);
+ }
+ }
+ if (!error) {
+ /*
+ * Give the user an updated idea of our state.
+ * If the generation differs from what we told
+ * her before, she knows that something happened
+ * while we were processing this request, and it
+ * might be necessary to retry.
+ */
+ bzero(&xug, sizeof(xug));
+ xug.xug_len = sizeof(xug);
+ xug.xug_gen = unp_gencnt;
+ xug.xug_sogen = so_gencnt;
+ xug.xug_count = unp_count;
+ error = SYSCTL_OUT(req, &xug, sizeof(xug));
+ }
+ FREE(unp_list, M_TEMP);
+ lck_rw_done(unp_list_mtx);
+ return error;
}
+SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist64,
+ CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED,
+ (caddr_t)(long)SOCK_DGRAM, 0, unp_pcblist64, "S,xunpcb64",
+ "List of active local datagram sockets 64 bit");
+SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist64,
+ CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED,
+ (caddr_t)(long)SOCK_STREAM, 0, unp_pcblist64, "S,xunpcb64",
+ "List of active local stream sockets 64 bit");
+
+#endif /* !CONFIG_EMBEDDED */
+
static void
-unp_drop(
- struct unpcb *unp,
- int errno)
+unp_shutdown(struct unpcb *unp)
{
struct socket *so = unp->unp_socket;
-
- so->so_error = errno;
- unp_disconnect(unp);
+ struct socket *so2;
+ if (unp->unp_socket->so_type == SOCK_STREAM && unp->unp_conn) {
+ so2 = unp->unp_conn->unp_socket;
+ unp_get_locks_in_order(so, so2);
+ socantrcvmore(so2);
+ socket_unlock(so2, 1);
+ }
}
-#ifdef notdef
-void
-unp_drain()
+static void
+unp_drop(struct unpcb *unp, int errno)
{
+ struct socket *so = unp->unp_socket;
+ so->so_error = errno;
+ unp_disconnect(unp);
}
-#endif
+/*
+ * Returns: 0 Success
+ * EMSGSIZE The new fd's will not fit
+ * ENOBUFS Cannot alloc struct fileproc
+ */
int
unp_externalize(struct mbuf *rights)
{
- struct proc *p = current_proc(); /* XXX */
+ proc_t p = current_proc(); /* XXX */
int i;
struct cmsghdr *cm = mtod(rights, struct cmsghdr *);
struct fileglob **rp = (struct fileglob **)(cm + 1);
+ int *fds = (int *)(cm + 1);
struct fileproc *fp;
- struct fileglob *fg;
- int newfds = (cm->cmsg_len - sizeof(*cm)) / sizeof (int);
- int f;
+ struct fileproc **fileproc_l;
+ int newfds = (cm->cmsg_len - sizeof(*cm)) / sizeof(int);
+ int f, error = 0;
+
+ MALLOC(fileproc_l, struct fileproc **,
+ newfds * sizeof(struct fileproc *), M_TEMP, M_WAITOK);
+ if (fileproc_l == NULL) {
+ error = ENOMEM;
+ goto discard;
+ }
proc_fdlock(p);
* if the new FD's will not fit, then we free them all
*/
if (!fdavail(p, newfds)) {
- for (i = 0; i < newfds; i++) {
- fg = *rp;
- unp_discard_fdlocked(fg, p);
- *rp++ = 0;
- }
proc_fdunlock(p);
-
- return (EMSGSIZE);
+ error = EMSGSIZE;
+ goto discard;
}
/*
- * now change each pointer to an fd in the global table to
+ * now change each pointer to an fd in the global table to
* an integer that is the index to the local fd table entry
* that we set up to point to the global one we are transferring.
- * XXX this assumes a pointer and int are the same size...!
+ * XXX (1) this assumes a pointer and int are the same size,
+ * XXX or the mbuf can hold the expansion
+ * XXX (2) allocation failures should be non-fatal
*/
for (i = 0; i < newfds; i++) {
- if (fdalloc(p, 0, &f))
- panic("unp_externalize");
- fg = *rp;
- MALLOC_ZONE(fp, struct fileproc *, sizeof(struct fileproc), M_FILEPROC, M_WAITOK);
- bzero(fp, sizeof(struct fileproc));
- fp->f_iocount = 0;
- fp->f_fglob = fg;
- p->p_fd->fd_ofiles[f] = fp;
- fg_removeuipc(fg);
- *fdflags(p, f) &= ~UF_RESERVED;
- unp_rights--;
- *(int *)rp++ = f;
+#if CONFIG_MACF_SOCKET
+ /*
+ * If receive access is denied, don't pass along
+ * and error message, just discard the descriptor.
+ */
+ if (mac_file_check_receive(kauth_cred_get(), rp[i])) {
+ proc_fdunlock(p);
+ unp_discard(rp[i], p);
+ fds[i] = 0;
+ proc_fdlock(p);
+ continue;
+ }
+#endif
+ if (fdalloc(p, 0, &f)) {
+ panic("unp_externalize:fdalloc");
+ }
+ fp = fileproc_alloc_init(NULL);
+ if (fp == NULL) {
+ panic("unp_externalize: MALLOC_ZONE");
+ }
+ fp->f_fglob = rp[i];
+ if (fg_removeuipc_mark(rp[i])) {
+ /*
+ * Take an iocount on the fp for completing the
+ * removal from the global msg queue
+ */
+ os_ref_retain_locked(&fp->f_iocount);
+ fileproc_l[i] = fp;
+ } else {
+ fileproc_l[i] = NULL;
+ }
+ procfdtbl_releasefd(p, f, fp);
+ fds[i] = f;
}
proc_fdunlock(p);
- return (0);
+ for (i = 0; i < newfds; i++) {
+ if (fileproc_l[i] != NULL) {
+ VERIFY(fileproc_l[i]->f_fglob != NULL &&
+ (fileproc_l[i]->f_fglob->fg_lflags & FG_RMMSGQ));
+ VERIFY(fds[i] >= 0);
+ fg_removeuipc(fileproc_l[i]->f_fglob);
+
+ /* Drop the iocount */
+ fp_drop(p, fds[i], fileproc_l[i], 0);
+ fileproc_l[i] = NULL;
+ }
+ if (fds[i] != 0) {
+ (void) OSAddAtomic(-1, &unp_rights);
+ }
+ }
+
+discard:
+ if (fileproc_l != NULL) {
+ FREE(fileproc_l, M_TEMP);
+ }
+ if (error) {
+ for (i = 0; i < newfds; i++) {
+ unp_discard(*rp, p);
+ *rp++ = NULL;
+ }
+ }
+ return error;
}
void
unp_init(void)
{
- unp_zone = zinit(sizeof(struct unpcb),
- (nmbclusters * sizeof(struct unpcb)),
- 4096, "unpzone");
- if (unp_zone == 0)
+ _CASSERT(UIPC_MAX_CMSG_FD >= (MCLBYTES / sizeof(int)));
+ unp_zone = zinit(sizeof(struct unpcb),
+ (nmbclusters * sizeof(struct unpcb)), 4096, "unpzone");
+
+ if (unp_zone == 0) {
panic("unp_init");
+ }
LIST_INIT(&unp_dhead);
LIST_INIT(&unp_shead);
-
- unp_mutex = localdomain.dom_mtx;
+
+ /*
+ * allocate lock group attribute and group for udp pcb mutexes
+ */
+ unp_mtx_grp_attr = lck_grp_attr_alloc_init();
+
+ unp_mtx_grp = lck_grp_alloc_init("unp_list", unp_mtx_grp_attr);
+
+ unp_mtx_attr = lck_attr_alloc_init();
+
+ if ((unp_list_mtx = lck_rw_alloc_init(unp_mtx_grp,
+ unp_mtx_attr)) == NULL) {
+ return; /* pretty much dead if this fails... */
+ }
+ if ((unp_disconnect_lock = lck_mtx_alloc_init(unp_mtx_grp,
+ unp_mtx_attr)) == NULL) {
+ return;
+ }
+
+ if ((unp_connect_lock = lck_mtx_alloc_init(unp_mtx_grp,
+ unp_mtx_attr)) == NULL) {
+ return;
+ }
}
#ifndef MIN
-#define MIN(a,b) (((a)<(b))?(a):(b))
+#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#endif
+/*
+ * Returns: 0 Success
+ * EINVAL
+ * fdgetf_noref:EBADF
+ */
static int
-unp_internalize(
- struct mbuf *control,
- struct proc *p)
+unp_internalize(struct mbuf *control, proc_t p)
{
struct cmsghdr *cm = mtod(control, struct cmsghdr *);
+ int *fds;
struct fileglob **rp;
struct fileproc *fp;
- register int i, error;
+ int i, error;
int oldfds;
- int fdgetf_noref(proc_t, struct fileglob **, struct fileproc **);
+ uint8_t fg_ins[UIPC_MAX_CMSG_FD / 8];
+ /* 64bit: cmsg_len is 'uint32_t', m_len is 'long' */
if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET ||
- cm->cmsg_len != control->m_len) {
- return (EINVAL);
+ (socklen_t)cm->cmsg_len != (socklen_t)control->m_len) {
+ return EINVAL;
}
- oldfds = (cm->cmsg_len - sizeof (*cm)) / sizeof (int);
+ oldfds = (cm->cmsg_len - sizeof(*cm)) / sizeof(int);
+ bzero(fg_ins, sizeof(fg_ins));
proc_fdlock(p);
- rp = (struct fileglob **)(cm + 1);
+ fds = (int *)(cm + 1);
for (i = 0; i < oldfds; i++) {
- if (error = fdgetf_noref(p, *(int *)rp++, (struct fileglob **)0)) {
- proc_fdunlock(p);
- return (error);
- }
+ struct fileproc *tmpfp;
+ if (((error = fdgetf_noref(p, fds[i], &tmpfp)) != 0)) {
+ proc_fdunlock(p);
+ return error;
+ } else if (!file_issendable(p, tmpfp)) {
+ proc_fdunlock(p);
+ return EINVAL;
+ } else if (FP_ISGUARDED(tmpfp, GUARD_SOCKET_IPC)) {
+ error = fp_guard_exception(p,
+ fds[i], tmpfp, kGUARD_EXC_SOCKET_IPC);
+ proc_fdunlock(p);
+ return error;
+ }
}
rp = (struct fileglob **)(cm + 1);
- for (i = 0; i < oldfds; i++) {
- (void) fdgetf_noref(p, *(int *)rp, &fp);
- fg_insertuipc(fp->f_fglob);
- *rp++ = fp->f_fglob;
- unp_rights++;
+ /* On K64 we need to walk backwards because a fileglob * is twice the size of an fd
+ * and doing them in-order would result in stomping over unprocessed fd's
+ */
+ for (i = (oldfds - 1); i >= 0; i--) {
+ (void) fdgetf_noref(p, fds[i], &fp);
+ if (fg_insertuipc_mark(fp->f_fglob)) {
+ fg_ins[i / 8] |= 0x80 >> (i % 8);
+ }
+ rp[i] = fp->f_fglob;
}
proc_fdunlock(p);
- return (0);
+ for (i = 0; i < oldfds; i++) {
+ if (fg_ins[i / 8] & (0x80 >> (i % 8))) {
+ VERIFY(rp[i]->fg_lflags & FG_INSMSGQ);
+ fg_insertuipc(rp[i]);
+ }
+ (void) OSAddAtomic(1, &unp_rights);
+ }
+
+ return 0;
}
-static int unp_defer, unp_gcing;
+static int unp_defer, unp_gcing, unp_gcwait;
+static thread_t unp_gcthread = NULL;
-static void
-unp_gc()
+/* always called under uipc_lock */
+void
+unp_gc_wait(void)
+{
+ if (unp_gcthread == current_thread()) {
+ return;
+ }
+
+ while (unp_gcing != 0) {
+ unp_gcwait = 1;
+ msleep(&unp_gcing, uipc_lock, 0, "unp_gc_wait", NULL);
+ }
+}
+
+
+__private_extern__ void
+unp_gc(void)
{
- register struct fileglob *fg, *nextfg;
- register struct socket *so;
- struct fileglob **extra_ref, **fpp;
+ struct fileglob *fg, *nextfg;
+ struct socket *so;
+ static struct fileglob **extra_ref;
+ struct fileglob **fpp;
int nunref, i;
+ int need_gcwakeup = 0;
lck_mtx_lock(uipc_lock);
if (unp_gcing) {
}
unp_gcing = 1;
unp_defer = 0;
+ unp_gcthread = current_thread();
lck_mtx_unlock(uipc_lock);
- /*
- * before going through all this, set all FDs to
+ /*
+ * before going through all this, set all FDs to
* be NOT defered and NOT externally accessible
*/
for (fg = fmsghead.lh_first; fg != 0; fg = fg->f_msglist.le_next) {
lck_mtx_lock(&fg->fg_lock);
- fg->fg_flag &= ~(FMARK|FDEFER);
+ fg->fg_flag &= ~(FMARK | FDEFER);
lck_mtx_unlock(&fg->fg_lock);
}
do {
- for (fg = fmsghead.lh_first; fg != 0; fg = fg->f_msglist.le_next) {
+ for (fg = fmsghead.lh_first; fg != 0;
+ fg = fg->f_msglist.le_next) {
lck_mtx_lock(&fg->fg_lock);
/*
* If the file is not open, skip it
* if it's not defered, then check if it's
* already marked.. if so skip it
*/
- if (fg->fg_flag & FMARK){
+ if (fg->fg_flag & FMARK) {
lck_mtx_unlock(&fg->fg_lock);
continue;
}
- /*
+ /*
* If all references are from messages
- * in transit, then skip it. it's not
+ * in transit, then skip it. it's not
* externally accessible.
- */
+ */
if (fg->fg_count == fg->fg_msgcount) {
lck_mtx_unlock(&fg->fg_lock);
continue;
}
- /*
+ /*
* If it got this far then it must be
* externally accessible.
*/
fg->fg_flag |= FMARK;
}
/*
- * either it was defered, or it is externally
+ * either it was defered, or it is externally
* accessible and not already marked so.
* Now check if it is possibly one of OUR sockets.
- */
- if (fg->fg_type != DTYPE_SOCKET ||
+ */
+ if (FILEGLOB_DTYPE(fg) != DTYPE_SOCKET ||
(so = (struct socket *)fg->fg_data) == 0) {
lck_mtx_unlock(&fg->fg_lock);
continue;
}
- if (so->so_proto->pr_domain != &localdomain ||
- (so->so_proto->pr_flags&PR_RIGHTS) == 0) {
+ if (so->so_proto->pr_domain != localdomain ||
+ (so->so_proto->pr_flags & PR_RIGHTS) == 0) {
lck_mtx_unlock(&fg->fg_lock);
continue;
}
#ifdef notdef
- /* if this code is enabled need to run under network funnel */
if (so->so_rcv.sb_flags & SB_LOCK) {
/*
* This is problematical; it's not clear
* So, Ok, it's one of our sockets and it IS externally
* accessible (or was defered). Now we look
* to see if we hold any file descriptors in its
- * message buffers. Follow those links and mark them
+ * message buffers. Follow those links and mark them
* as accessible too.
+ *
+ * In case a file is passed onto itself we need to
+ * release the file lock.
*/
- unp_scan(so->so_rcv.sb_mb, unp_mark);
lck_mtx_unlock(&fg->fg_lock);
+
+ unp_scan(so->so_rcv.sb_mb, unp_mark, 0);
}
} while (unp_defer);
/*
*
* 91/09/19, bsy@cs.cmu.edu
*/
- extra_ref = _MALLOC(nfiles * sizeof(struct fileglob *), M_FILEGLOB, M_WAITOK);
+ extra_ref = _MALLOC(nfiles * sizeof(struct fileglob *),
+ M_FILEGLOB, M_WAITOK);
+ if (extra_ref == NULL) {
+ goto bail;
+ }
for (nunref = 0, fg = fmsghead.lh_first, fpp = extra_ref; fg != 0;
fg = nextfg) {
lck_mtx_lock(&fg->fg_lock);
nextfg = fg->f_msglist.le_next;
- /*
+ /*
* If it's not open, skip it
*/
if (fg->fg_count == 0) {
lck_mtx_unlock(&fg->fg_lock);
continue;
}
- /*
+ /*
* If all refs are from msgs, and it's not marked accessible
* then it must be referenced from some unreachable cycle
* of (shut-down) FDs, so include it in our
}
lck_mtx_unlock(&fg->fg_lock);
}
- /*
+ /*
* for each FD on our hit list, do the following two things
*/
for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp) {
tfg = *fpp;
- if (tfg->fg_type == DTYPE_SOCKET && tfg->fg_data != NULL) {
- sorflush((struct socket *)(tfg->fg_data));
+ if (FILEGLOB_DTYPE(tfg) == DTYPE_SOCKET &&
+ tfg->fg_data != NULL) {
+ so = (struct socket *)(tfg->fg_data);
+
+ socket_lock(so, 0);
+
+ sorflush(so);
+
+ socket_unlock(so, 0);
}
}
- for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp)
- closef_locked((struct fileproc *)0, *fpp, (struct proc *) NULL);
+ for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp) {
+ closef_locked((struct fileproc *)0, *fpp, (proc_t)NULL);
+ }
+
+ FREE(extra_ref, M_FILEGLOB);
+bail:
+ lck_mtx_lock(uipc_lock);
unp_gcing = 0;
- FREE((caddr_t)extra_ref, M_FILEGLOB);
+ unp_gcthread = NULL;
+ if (unp_gcwait != 0) {
+ unp_gcwait = 0;
+ need_gcwakeup = 1;
+ }
+ lck_mtx_unlock(uipc_lock);
+
+ if (need_gcwakeup != 0) {
+ wakeup(&unp_gcing);
+ }
}
void
unp_dispose(struct mbuf *m)
{
-
if (m) {
- unp_scan(m, unp_discard);
+ unp_scan(m, unp_discard, NULL);
}
}
+/*
+ * Returns: 0 Success
+ */
static int
-unp_listen(
- struct unpcb *unp,
- struct proc *p)
+unp_listen(struct unpcb *unp, proc_t p)
{
-
- cru2x(p->p_ucred, &unp->unp_peercred);
+ kauth_cred_t safecred = kauth_cred_proc_ref(p);
+ cru2x(safecred, &unp->unp_peercred);
+ kauth_cred_unref(&safecred);
unp->unp_flags |= UNP_HAVEPCCACHED;
- return (0);
+ return 0;
}
-/* should run under kernel funnel */
static void
-unp_scan(
- struct mbuf *m0,
- void (*op)(struct fileglob *))
+unp_scan(struct mbuf *m0, void (*op)(struct fileglob *, void *arg), void *arg)
{
struct mbuf *m;
struct fileglob **rp;
int qfds;
while (m0) {
- for (m = m0; m; m = m->m_next)
+ for (m = m0; m; m = m->m_next) {
if (m->m_type == MT_CONTROL &&
- (size_t) m->m_len >= sizeof(*cm)) {
+ (size_t)m->m_len >= sizeof(*cm)) {
cm = mtod(m, struct cmsghdr *);
if (cm->cmsg_level != SOL_SOCKET ||
- cm->cmsg_type != SCM_RIGHTS)
+ cm->cmsg_type != SCM_RIGHTS) {
continue;
- qfds = (cm->cmsg_len - sizeof *cm)
- / sizeof (struct fileglob *);
+ }
+ qfds = (cm->cmsg_len - sizeof(*cm)) /
+ sizeof(int);
rp = (struct fileglob **)(cm + 1);
- for (i = 0; i < qfds; i++)
- (*op)(*rp++);
- break; /* XXX, but saves time */
+ for (i = 0; i < qfds; i++) {
+ (*op)(*rp++, arg);
+ }
+ break; /* XXX, but saves time */
}
+ }
m0 = m0->m_act;
}
}
-/* should run under kernel funnel */
static void
-unp_mark(struct fileglob *fg)
+unp_mark(struct fileglob *fg, __unused void *arg)
{
- lck_mtx_lock(&fg->fg_lock);
+ lck_mtx_lock(&fg->fg_lock);
if (fg->fg_flag & FMARK) {
- lck_mtx_unlock(&fg->fg_lock);
+ lck_mtx_unlock(&fg->fg_lock);
return;
}
- fg->fg_flag |= (FMARK|FDEFER);
+ fg->fg_flag |= (FMARK | FDEFER);
- lck_mtx_unlock(&fg->fg_lock);
+ lck_mtx_unlock(&fg->fg_lock);
unp_defer++;
}
-/* should run under kernel funnel */
static void
-unp_discard(fg)
- struct fileglob *fg;
+unp_discard(struct fileglob *fg, void *p)
{
- struct proc *p = current_proc(); /* XXX */
+ if (p == NULL) {
+ p = current_proc(); /* XXX */
+ }
+ (void) OSAddAtomic(1, &unp_disposed);
+ if (fg_removeuipc_mark(fg)) {
+ VERIFY(fg->fg_lflags & FG_RMMSGQ);
+ fg_removeuipc(fg);
+ }
+ (void) OSAddAtomic(-1, &unp_rights);
proc_fdlock(p);
- unp_discard_fdlocked(fg, p);
+ (void) closef_locked((struct fileproc *)0, fg, p);
proc_fdunlock(p);
}
-static void
-unp_discard_fdlocked(fg, p)
- struct fileglob *fg;
- struct proc *p;
+
+int
+unp_lock(struct socket *so, int refcount, void * lr)
{
+ void * lr_saved;
+ if (lr == 0) {
+ lr_saved = (void *) __builtin_return_address(0);
+ } else {
+ lr_saved = lr;
+ }
+
+ if (so->so_pcb) {
+ lck_mtx_lock(&((struct unpcb *)so->so_pcb)->unp_mtx);
+ } else {
+ panic("unp_lock: so=%p NO PCB! lr=%p ref=0x%x\n",
+ so, lr_saved, so->so_usecount);
+ }
- fg_removeuipc(fg);
+ if (so->so_usecount < 0) {
+ panic("unp_lock: so=%p so_pcb=%p lr=%p ref=0x%x\n",
+ so, so->so_pcb, lr_saved, so->so_usecount);
+ }
- unp_rights--;
- (void) closef_locked((struct fileproc *)0, fg, p);
+ if (refcount) {
+ VERIFY(so->so_usecount > 0);
+ so->so_usecount++;
+ }
+ so->lock_lr[so->next_lock_lr] = lr_saved;
+ so->next_lock_lr = (so->next_lock_lr + 1) % SO_LCKDBG_MAX;
+ return 0;
+}
+
+int
+unp_unlock(struct socket *so, int refcount, void * lr)
+{
+ void * lr_saved;
+ lck_mtx_t * mutex_held = NULL;
+ struct unpcb *unp = sotounpcb(so);
+
+ if (lr == 0) {
+ lr_saved = (void *) __builtin_return_address(0);
+ } else {
+ lr_saved = lr;
+ }
+
+ if (refcount) {
+ so->so_usecount--;
+ }
+
+ if (so->so_usecount < 0) {
+ panic("unp_unlock: so=%p usecount=%x\n", so, so->so_usecount);
+ }
+ if (so->so_pcb == NULL) {
+ panic("unp_unlock: so=%p NO PCB usecount=%x\n", so, so->so_usecount);
+ } else {
+ mutex_held = &((struct unpcb *)so->so_pcb)->unp_mtx;
+ }
+ LCK_MTX_ASSERT(mutex_held, LCK_MTX_ASSERT_OWNED);
+ so->unlock_lr[so->next_unlock_lr] = lr_saved;
+ so->next_unlock_lr = (so->next_unlock_lr + 1) % SO_LCKDBG_MAX;
+
+ if (so->so_usecount == 0 && (so->so_flags & SOF_PCBCLEARING)) {
+ sofreelastref(so, 1);
+
+ if (unp->unp_addr) {
+ FREE(unp->unp_addr, M_SONAME);
+ }
+
+ lck_mtx_unlock(mutex_held);
+
+ lck_mtx_destroy(&unp->unp_mtx, unp_mtx_grp);
+ zfree(unp_zone, unp);
+
+ unp_gc();
+ } else {
+ lck_mtx_unlock(mutex_held);
+ }
+
+ return 0;
+}
+
+lck_mtx_t *
+unp_getlock(struct socket *so, __unused int flags)
+{
+ struct unpcb *unp = (struct unpcb *)so->so_pcb;
+
+
+ if (so->so_pcb) {
+ if (so->so_usecount < 0) {
+ panic("unp_getlock: so=%p usecount=%x\n", so, so->so_usecount);
+ }
+ return &unp->unp_mtx;
+ } else {
+ panic("unp_getlock: so=%p NULL so_pcb\n", so);
+ return so->so_proto->pr_domain->dom_mtx;
+ }
}
projects / apple / xnu.git / blobdiff