2 * Copyright (c) 1982, 1986, 1989, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * From: @(#)uipc_usrreq.c 8.3 (Berkeley) 1/4/94
30 * $FreeBSD: src/sys/kern/uipc_usrreq.c,v 1.54.2.10 2003/03/04 17:28:09 nectar Exp $
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/kernel.h>
36 #include <sys/domain.h>
37 #include <sys/fcntl.h>
38 #include <sys/malloc.h> /* XXX must be before <sys/file.h> */
41 #include <sys/filedesc.h>
43 #include <sys/nlookup.h>
44 #include <sys/protosw.h>
45 #include <sys/socket.h>
46 #include <sys/socketvar.h>
47 #include <sys/resourcevar.h>
49 #include <sys/mount.h>
50 #include <sys/sysctl.h>
52 #include <sys/unpcb.h>
53 #include <sys/vnode.h>
55 #include <sys/file2.h>
56 #include <sys/spinlock2.h>
57 #include <sys/socketvar2.h>
58 #include <sys/msgport2.h>
60 #define UNP_DETACHED UNP_PRIVATE1
61 #define UNP_CONNECTING UNP_PRIVATE2
62 #define UNP_DROPPED UNP_PRIVATE3
64 #define UNP_ISATTACHED(unp) \
65 ((unp) != NULL && ((unp)->unp_flags & UNP_DETACHED) == 0)
68 #define UNP_ASSERT_TOKEN_HELD(unp) \
69 ASSERT_LWKT_TOKEN_HELD(lwkt_token_pool_lookup((unp)))
70 #else /* !INVARIANTS */
71 #define UNP_ASSERT_TOKEN_HELD(unp)
72 #endif /* INVARIANTS */
74 typedef struct unp_defdiscard {
75 struct unp_defdiscard *next;
79 static MALLOC_DEFINE(M_UNPCB, "unpcb", "unpcb struct");
80 static unp_gen_t unp_gencnt;
81 static u_int unp_count;
83 static struct unp_head unp_shead, unp_dhead;
85 static struct lwkt_token unp_token = LWKT_TOKEN_INITIALIZER(unp_token);
86 static int unp_defdiscard_nest;
87 static unp_defdiscard_t unp_defdiscard_base;
90 * Unix communications domain.
94 * rethink name space problems
95 * need a proper out-of-band
98 static struct sockaddr sun_noname = { sizeof(sun_noname), AF_LOCAL };
99 static ino_t unp_ino = 1; /* prototype for fake inode numbers */
100 static struct spinlock unp_ino_spin = SPINLOCK_INITIALIZER(&unp_ino_spin, "unp_ino_spin");
102 static int unp_attach (struct socket *, struct pru_attach_info *);
103 static void unp_detach (struct unpcb *);
104 static int unp_bind (struct unpcb *,struct sockaddr *, struct thread *);
105 static int unp_connect (struct socket *,struct sockaddr *,
107 static void unp_disconnect(struct unpcb *, int);
108 static void unp_shutdown (struct unpcb *);
109 static void unp_gc (void);
110 static int unp_gc_clearmarks(struct file *, void *);
111 static int unp_gc_checkmarks(struct file *, void *);
112 static int unp_gc_checkrefs(struct file *, void *);
113 static int unp_revoke_gc_check(struct file *, void *);
114 static void unp_scan (struct mbuf *, void (*)(struct file *, void *),
116 static void unp_mark (struct file *, void *data);
117 static void unp_discard (struct file *, void *);
118 static int unp_internalize (struct mbuf *, struct thread *);
119 static int unp_listen (struct unpcb *, struct thread *);
120 static void unp_fp_externalize(struct lwp *lp, struct file *fp, int fd);
121 static int unp_find_lockref(struct sockaddr *nam, struct thread *td,
122 short type, struct unpcb **unp_ret);
123 static int unp_connect_pair(struct unpcb *unp, struct unpcb *unp2);
124 static void unp_drop(struct unpcb *unp, int error);
127 * SMP Considerations:
129 * Since unp_token will be automaticly released upon execution of
130 * blocking code, we need to reference unp_conn before any possible
131 * blocking code to prevent it from being ripped behind our back.
133 * Any adjustment to unp->unp_conn requires both the global unp_token
134 * AND the per-unp token (lwkt_token_pool_lookup(unp)) to be held.
136 * Any access to so_pcb to obtain unp requires the pool token for
140 /* NOTE: unp_token MUST be held */
142 unp_reference(struct unpcb *unp)
144 atomic_add_int(&unp->unp_refcnt, 1);
147 /* NOTE: unp_token MUST be held */
149 unp_free(struct unpcb *unp)
151 KKASSERT(unp->unp_refcnt > 0);
152 if (atomic_fetchadd_int(&unp->unp_refcnt, -1) == 1)
156 static __inline struct unpcb *
157 unp_getsocktoken(struct socket *so)
162 * The unp pointer is invalid until we verify that it is
163 * good by re-checking so_pcb AFTER obtaining the token.
165 while ((unp = so->so_pcb) != NULL) {
166 lwkt_getpooltoken(unp);
167 if (unp == so->so_pcb)
169 lwkt_relpooltoken(unp);
175 unp_reltoken(struct unpcb *unp)
178 lwkt_relpooltoken(unp);
182 unp_setflags(struct unpcb *unp, int flags)
184 atomic_set_int(&unp->unp_flags, flags);
188 unp_clrflags(struct unpcb *unp, int flags)
190 atomic_clear_int(&unp->unp_flags, flags);
194 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
195 * will sofree() it when we return.
198 uipc_abort(netmsg_t msg)
203 lwkt_gettoken(&unp_token);
204 unp = unp_getsocktoken(msg->base.nm_so);
206 if (UNP_ISATTACHED(unp)) {
207 unp_setflags(unp, UNP_DETACHED);
208 unp_drop(unp, ECONNABORTED);
216 lwkt_reltoken(&unp_token);
218 lwkt_replymsg(&msg->lmsg, error);
222 uipc_accept(netmsg_t msg)
227 lwkt_gettoken(&unp_token);
228 unp = msg->base.nm_so->so_pcb;
229 if (!UNP_ISATTACHED(unp)) {
232 struct unpcb *unp2 = unp->unp_conn;
235 * Pass back name of connected socket,
236 * if it was bound and we are still connected
237 * (our peer may have closed already!).
239 if (unp2 && unp2->unp_addr) {
241 *msg->accept.nm_nam = dup_sockaddr(
242 (struct sockaddr *)unp2->unp_addr);
245 *msg->accept.nm_nam = dup_sockaddr(&sun_noname);
249 lwkt_reltoken(&unp_token);
250 lwkt_replymsg(&msg->lmsg, error);
254 uipc_attach(netmsg_t msg)
259 lwkt_gettoken(&unp_token);
260 unp = msg->base.nm_so->so_pcb;
261 KASSERT(unp == NULL, ("double unp attach"));
262 error = unp_attach(msg->base.nm_so, msg->attach.nm_ai);
263 lwkt_reltoken(&unp_token);
264 lwkt_replymsg(&msg->lmsg, error);
268 uipc_bind(netmsg_t msg)
273 lwkt_gettoken(&unp_token);
274 unp = msg->base.nm_so->so_pcb;
275 if (UNP_ISATTACHED(unp))
276 error = unp_bind(unp, msg->bind.nm_nam, msg->bind.nm_td);
279 lwkt_reltoken(&unp_token);
280 lwkt_replymsg(&msg->lmsg, error);
284 uipc_connect(netmsg_t msg)
288 error = unp_connect(msg->base.nm_so, msg->connect.nm_nam,
290 lwkt_replymsg(&msg->lmsg, error);
294 uipc_connect2(netmsg_t msg)
298 error = unp_connect2(msg->connect2.nm_so1, msg->connect2.nm_so2);
299 lwkt_replymsg(&msg->lmsg, error);
302 /* control is EOPNOTSUPP */
305 uipc_detach(netmsg_t msg)
310 lwkt_gettoken(&unp_token);
311 unp = unp_getsocktoken(msg->base.nm_so);
313 if (UNP_ISATTACHED(unp)) {
314 unp_setflags(unp, UNP_DETACHED);
323 lwkt_reltoken(&unp_token);
325 lwkt_replymsg(&msg->lmsg, error);
329 uipc_disconnect(netmsg_t msg)
334 lwkt_gettoken(&unp_token);
335 unp = unp_getsocktoken(msg->base.nm_so);
337 if (UNP_ISATTACHED(unp)) {
338 unp_disconnect(unp, 0);
345 lwkt_reltoken(&unp_token);
347 lwkt_replymsg(&msg->lmsg, error);
351 uipc_listen(netmsg_t msg)
356 lwkt_gettoken(&unp_token);
357 unp = msg->base.nm_so->so_pcb;
358 if (!UNP_ISATTACHED(unp) || unp->unp_vnode == NULL)
361 error = unp_listen(unp, msg->listen.nm_td);
362 lwkt_reltoken(&unp_token);
363 lwkt_replymsg(&msg->lmsg, error);
367 uipc_peeraddr(netmsg_t msg)
372 lwkt_gettoken(&unp_token);
373 unp = msg->base.nm_so->so_pcb;
374 if (!UNP_ISATTACHED(unp)) {
376 } else if (unp->unp_conn && unp->unp_conn->unp_addr) {
377 struct unpcb *unp2 = unp->unp_conn;
380 *msg->peeraddr.nm_nam = dup_sockaddr(
381 (struct sockaddr *)unp2->unp_addr);
386 * XXX: It seems that this test always fails even when
387 * connection is established. So, this else clause is
388 * added as workaround to return PF_LOCAL sockaddr.
390 *msg->peeraddr.nm_nam = dup_sockaddr(&sun_noname);
393 lwkt_reltoken(&unp_token);
394 lwkt_replymsg(&msg->lmsg, error);
398 uipc_rcvd(netmsg_t msg)
400 struct unpcb *unp, *unp2;
406 * so_pcb is only modified with both the global and the unp
409 so = msg->base.nm_so;
410 unp = unp_getsocktoken(so);
412 if (!UNP_ISATTACHED(unp)) {
417 switch (so->so_type) {
419 panic("uipc_rcvd DGRAM?");
423 if (unp->unp_conn == NULL)
425 unp2 = unp->unp_conn; /* protected by pool token */
428 * Because we are transfering mbufs directly to the
429 * peer socket we have to use SSB_STOP on the sender
430 * to prevent it from building up infinite mbufs.
432 * As in several places in this module w ehave to ref unp2
433 * to ensure that it does not get ripped out from under us
434 * if we block on the so2 token or in sowwakeup().
436 so2 = unp2->unp_socket;
438 lwkt_gettoken(&so2->so_rcv.ssb_token);
439 if (so->so_rcv.ssb_cc < so2->so_snd.ssb_hiwat &&
440 so->so_rcv.ssb_mbcnt < so2->so_snd.ssb_mbmax
442 atomic_clear_int(&so2->so_snd.ssb_flags, SSB_STOP);
446 lwkt_reltoken(&so2->so_rcv.ssb_token);
450 panic("uipc_rcvd unknown socktype");
456 lwkt_replymsg(&msg->lmsg, error);
459 /* pru_rcvoob is EOPNOTSUPP */
462 uipc_send(netmsg_t msg)
464 struct unpcb *unp, *unp2;
467 struct mbuf *control;
471 so = msg->base.nm_so;
472 control = msg->send.nm_control;
476 * so_pcb is only modified with both the global and the unp
479 so = msg->base.nm_so;
480 unp = unp_getsocktoken(so);
482 if (!UNP_ISATTACHED(unp)) {
487 if (msg->send.nm_flags & PRUS_OOB) {
492 wakeup_start_delayed();
494 if (control && (error = unp_internalize(control, msg->send.nm_td)))
497 switch (so->so_type) {
500 struct sockaddr *from;
502 if (msg->send.nm_addr) {
507 error = unp_find_lockref(msg->send.nm_addr,
508 msg->send.nm_td, so->so_type, &unp2);
513 * unp2 is locked and referenced.
515 * We could unlock unp2 now, since it was checked
520 if (unp->unp_conn == NULL) {
525 unp2 = unp->unp_conn;
528 /* NOTE: unp2 is referenced. */
529 so2 = unp2->unp_socket;
532 from = (struct sockaddr *)unp->unp_addr;
536 lwkt_gettoken(&so2->so_rcv.ssb_token);
537 if (ssb_appendaddr(&so2->so_rcv, from, m, control)) {
544 lwkt_reltoken(&so2->so_rcv.ssb_token);
552 /* Connect if not connected yet. */
554 * Note: A better implementation would complain
555 * if not equal to the peer's address.
557 if (!(so->so_state & SS_ISCONNECTED)) {
558 if (msg->send.nm_addr) {
559 error = unp_connect(so,
570 if (so->so_state & SS_CANTSENDMORE) {
574 if (unp->unp_conn == NULL)
575 panic("uipc_send connected but no connection?");
576 unp2 = unp->unp_conn;
577 so2 = unp2->unp_socket;
582 * Send to paired receive port, and then reduce
583 * send buffer hiwater marks to maintain backpressure.
586 lwkt_gettoken(&so2->so_rcv.ssb_token);
588 if (ssb_appendcontrol(&so2->so_rcv, m, control)) {
592 } else if (so->so_type == SOCK_SEQPACKET) {
593 sbappendrecord(&so2->so_rcv.sb, m);
596 sbappend(&so2->so_rcv.sb, m);
601 * Because we are transfering mbufs directly to the
602 * peer socket we have to use SSB_STOP on the sender
603 * to prevent it from building up infinite mbufs.
605 if (so2->so_rcv.ssb_cc >= so->so_snd.ssb_hiwat ||
606 so2->so_rcv.ssb_mbcnt >= so->so_snd.ssb_mbmax
608 atomic_set_int(&so->so_snd.ssb_flags, SSB_STOP);
610 lwkt_reltoken(&so2->so_rcv.ssb_token);
617 panic("uipc_send unknown socktype");
621 * SEND_EOF is equivalent to a SEND followed by a SHUTDOWN.
623 if (msg->send.nm_flags & PRUS_EOF) {
628 if (control && error != 0)
629 unp_dispose(control);
632 wakeup_end_delayed();
638 lwkt_replymsg(&msg->lmsg, error);
645 uipc_sense(netmsg_t msg)
652 so = msg->base.nm_so;
653 sb = msg->sense.nm_stat;
656 * so_pcb is only modified with both the global and the unp
659 unp = unp_getsocktoken(so);
661 if (!UNP_ISATTACHED(unp)) {
666 sb->st_blksize = so->so_snd.ssb_hiwat;
668 if (unp->unp_ino == 0) { /* make up a non-zero inode number */
669 spin_lock(&unp_ino_spin);
670 unp->unp_ino = unp_ino++;
671 spin_unlock(&unp_ino_spin);
673 sb->st_ino = unp->unp_ino;
677 lwkt_replymsg(&msg->lmsg, error);
681 uipc_shutdown(netmsg_t msg)
688 * so_pcb is only modified with both the global and the unp
691 so = msg->base.nm_so;
692 unp = unp_getsocktoken(so);
694 if (UNP_ISATTACHED(unp)) {
703 lwkt_replymsg(&msg->lmsg, error);
707 uipc_sockaddr(netmsg_t msg)
714 * so_pcb is only modified with both the global and the unp
717 so = msg->base.nm_so;
718 unp = unp_getsocktoken(so);
720 if (UNP_ISATTACHED(unp)) {
722 *msg->sockaddr.nm_nam =
723 dup_sockaddr((struct sockaddr *)unp->unp_addr);
731 lwkt_replymsg(&msg->lmsg, error);
734 struct pr_usrreqs uipc_usrreqs = {
735 .pru_abort = uipc_abort,
736 .pru_accept = uipc_accept,
737 .pru_attach = uipc_attach,
738 .pru_bind = uipc_bind,
739 .pru_connect = uipc_connect,
740 .pru_connect2 = uipc_connect2,
741 .pru_control = pr_generic_notsupp,
742 .pru_detach = uipc_detach,
743 .pru_disconnect = uipc_disconnect,
744 .pru_listen = uipc_listen,
745 .pru_peeraddr = uipc_peeraddr,
746 .pru_rcvd = uipc_rcvd,
747 .pru_rcvoob = pr_generic_notsupp,
748 .pru_send = uipc_send,
749 .pru_sense = uipc_sense,
750 .pru_shutdown = uipc_shutdown,
751 .pru_sockaddr = uipc_sockaddr,
752 .pru_sosend = sosend,
753 .pru_soreceive = soreceive
757 uipc_ctloutput(netmsg_t msg)
760 struct sockopt *sopt;
764 lwkt_gettoken(&unp_token);
765 so = msg->base.nm_so;
766 sopt = msg->ctloutput.nm_sopt;
769 switch (sopt->sopt_dir) {
771 switch (sopt->sopt_name) {
773 if (unp->unp_flags & UNP_HAVEPC)
774 soopt_from_kbuf(sopt, &unp->unp_peercred,
775 sizeof(unp->unp_peercred));
777 if (so->so_type == SOCK_STREAM)
779 else if (so->so_type == SOCK_SEQPACKET)
795 lwkt_reltoken(&unp_token);
796 lwkt_replymsg(&msg->lmsg, error);
800 * Both send and receive buffers are allocated PIPSIZ bytes of buffering
801 * for stream sockets, although the total for sender and receiver is
802 * actually only PIPSIZ.
804 * Datagram sockets really use the sendspace as the maximum datagram size,
805 * and don't really want to reserve the sendspace. Their recvspace should
806 * be large enough for at least one max-size datagram plus address.
808 * We want the local send/recv space to be significant larger then lo0's
814 static u_long unpst_sendspace = PIPSIZ;
815 static u_long unpst_recvspace = PIPSIZ;
816 static u_long unpdg_sendspace = 2*1024; /* really max datagram size */
817 static u_long unpdg_recvspace = 4*1024;
819 static int unp_rights; /* file descriptors in flight */
820 static struct spinlock unp_spin = SPINLOCK_INITIALIZER(&unp_spin, "unp_spin");
822 SYSCTL_DECL(_net_local_seqpacket);
823 SYSCTL_DECL(_net_local_stream);
824 SYSCTL_INT(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW,
825 &unpst_sendspace, 0, "Size of stream socket send buffer");
826 SYSCTL_INT(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW,
827 &unpst_recvspace, 0, "Size of stream socket receive buffer");
829 SYSCTL_DECL(_net_local_dgram);
830 SYSCTL_INT(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW,
831 &unpdg_sendspace, 0, "Max datagram socket size");
832 SYSCTL_INT(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW,
833 &unpdg_recvspace, 0, "Size of datagram socket receive buffer");
835 SYSCTL_DECL(_net_local);
836 SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0,
837 "File descriptors in flight");
840 unp_attach(struct socket *so, struct pru_attach_info *ai)
845 lwkt_gettoken(&unp_token);
847 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
848 switch (so->so_type) {
851 error = soreserve(so, unpst_sendspace, unpst_recvspace,
856 error = soreserve(so, unpdg_sendspace, unpdg_recvspace,
868 * In order to support sendfile we have to set either SSB_STOPSUPP
869 * or SSB_PREALLOC. Unix domain sockets use the SSB_STOP flow
872 if (so->so_type == SOCK_STREAM) {
873 atomic_set_int(&so->so_rcv.ssb_flags, SSB_STOPSUPP);
874 atomic_set_int(&so->so_snd.ssb_flags, SSB_STOPSUPP);
877 unp = kmalloc(sizeof(*unp), M_UNPCB, M_WAITOK | M_ZERO | M_NULLOK);
883 unp->unp_gencnt = ++unp_gencnt;
885 LIST_INIT(&unp->unp_refs);
886 unp->unp_socket = so;
887 unp->unp_rvnode = ai->fd_rdir; /* jail cruft XXX JH */
888 LIST_INSERT_HEAD(so->so_type == SOCK_DGRAM ? &unp_dhead
889 : &unp_shead, unp, unp_link);
890 so->so_pcb = (caddr_t)unp;
894 lwkt_reltoken(&unp_token);
899 unp_detach(struct unpcb *unp)
903 lwkt_gettoken(&unp_token);
904 lwkt_getpooltoken(unp);
906 LIST_REMOVE(unp, unp_link); /* both tokens required */
907 unp->unp_gencnt = ++unp_gencnt;
909 if (unp->unp_vnode) {
910 unp->unp_vnode->v_socket = NULL;
911 vrele(unp->unp_vnode);
912 unp->unp_vnode = NULL;
914 soisdisconnected(unp->unp_socket);
915 so = unp->unp_socket;
916 soreference(so); /* for delayed sorflush */
917 KKASSERT(so->so_pcb == unp);
918 so->so_pcb = NULL; /* both tokens required */
919 unp->unp_socket = NULL;
920 sofree(so); /* remove pcb ref */
924 * Normally the receive buffer is flushed later,
925 * in sofree, but if our receive buffer holds references
926 * to descriptors that are now garbage, we will dispose
927 * of those descriptor references after the garbage collector
928 * gets them (resulting in a "panic: closef: count < 0").
934 lwkt_relpooltoken(unp);
935 lwkt_reltoken(&unp_token);
937 KASSERT(unp->unp_conn == NULL, ("unp is still connected"));
938 KASSERT(LIST_EMPTY(&unp->unp_refs), ("unp still has references"));
941 kfree(unp->unp_addr, M_SONAME);
946 unp_bind(struct unpcb *unp, struct sockaddr *nam, struct thread *td)
948 struct proc *p = td->td_proc;
949 struct sockaddr_un *soun = (struct sockaddr_un *)nam;
953 struct nlookupdata nd;
954 char buf[SOCK_MAXADDRLEN];
956 lwkt_gettoken(&unp_token);
957 if (unp->unp_vnode != NULL) {
961 namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path);
966 strncpy(buf, soun->sun_path, namelen);
967 buf[namelen] = 0; /* null-terminate the string */
968 error = nlookup_init(&nd, buf, UIO_SYSSPACE,
969 NLC_LOCKVP | NLC_CREATE | NLC_REFDVP);
971 error = nlookup(&nd);
972 if (error == 0 && nd.nl_nch.ncp->nc_vp != NULL)
978 vattr.va_type = VSOCK;
979 vattr.va_mode = (ACCESSPERMS & ~p->p_fd->fd_cmask);
980 error = VOP_NCREATE(&nd.nl_nch, nd.nl_dvp, &vp, nd.nl_cred, &vattr);
982 if (unp->unp_vnode == NULL) {
983 vp->v_socket = unp->unp_socket;
985 unp->unp_addr = (struct sockaddr_un *)dup_sockaddr(nam);
988 vput(vp); /* late race */
995 lwkt_reltoken(&unp_token);
1000 unp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1002 struct unpcb *unp, *unp2;
1003 int error, flags = 0;
1005 lwkt_gettoken(&unp_token);
1007 unp = unp_getsocktoken(so);
1008 if (!UNP_ISATTACHED(unp)) {
1013 if ((unp->unp_flags & UNP_CONNECTING) || unp->unp_conn != NULL) {
1018 flags = UNP_CONNECTING;
1019 unp_setflags(unp, flags);
1021 error = unp_find_lockref(nam, td, so->so_type, &unp2);
1026 * unp2 is locked and referenced.
1029 if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
1030 struct socket *so2, *so3;
1033 so2 = unp2->unp_socket;
1034 if (!(so2->so_options & SO_ACCEPTCONN) ||
1035 (so3 = sonewconn_faddr(so2, 0, NULL,
1036 TRUE /* keep ref */)) == NULL) {
1037 error = ECONNREFUSED;
1040 /* so3 has a socket reference. */
1042 unp3 = unp_getsocktoken(so3);
1043 if (!UNP_ISATTACHED(unp3)) {
1046 * Already aborted; we only need to drop the
1047 * socket reference held by sonewconn_faddr().
1050 error = ECONNREFUSED;
1053 unp_reference(unp3);
1056 * unp3 is locked and referenced.
1060 * Release so3 socket reference held by sonewconn_faddr().
1061 * Since we have referenced unp3, neither unp3 nor so3 will
1062 * be destroyed here.
1066 if (unp2->unp_addr != NULL) {
1067 unp3->unp_addr = (struct sockaddr_un *)
1068 dup_sockaddr((struct sockaddr *)unp2->unp_addr);
1072 * unp_peercred management:
1074 * The connecter's (client's) credentials are copied
1075 * from its process structure at the time of connect()
1078 cru2x(td->td_proc->p_ucred, &unp3->unp_peercred);
1079 unp_setflags(unp3, UNP_HAVEPC);
1081 * The receiver's (server's) credentials are copied
1082 * from the unp_peercred member of socket on which the
1083 * former called listen(); unp_listen() cached that
1084 * process's credentials at that time so we can use
1087 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED,
1088 ("unp_connect: listener without cached peercred"));
1089 memcpy(&unp->unp_peercred, &unp2->unp_peercred,
1090 sizeof(unp->unp_peercred));
1091 unp_setflags(unp, UNP_HAVEPC);
1093 error = unp_connect_pair(unp, unp3);
1095 /* XXX we need a better name */
1099 /* Done with unp3 */
1103 error = unp_connect_pair(unp, unp2);
1110 unp_clrflags(unp, flags);
1113 lwkt_reltoken(&unp_token);
1118 * Connect two unix domain sockets together.
1120 * NOTE: Semantics for any change to unp_conn requires that the per-unp
1121 * pool token also be held.
1124 unp_connect2(struct socket *so, struct socket *so2)
1126 struct unpcb *unp, *unp2;
1129 lwkt_gettoken(&unp_token);
1130 if (so2->so_type != so->so_type) {
1131 lwkt_reltoken(&unp_token);
1132 return (EPROTOTYPE);
1134 unp = unp_getsocktoken(so);
1135 unp2 = unp_getsocktoken(so2);
1137 if (!UNP_ISATTACHED(unp)) {
1141 if (!UNP_ISATTACHED(unp2)) {
1142 error = ECONNREFUSED;
1146 if (unp->unp_conn != NULL) {
1150 if ((so->so_type == SOCK_STREAM || so->so_type == SOCK_SEQPACKET) &&
1151 unp2->unp_conn != NULL) {
1156 error = unp_connect_pair(unp, unp2);
1160 lwkt_reltoken(&unp_token);
1165 * Disconnect a unix domain socket pair.
1167 * NOTE: Semantics for any change to unp_conn requires that the per-unp
1168 * pool token also be held.
1171 unp_disconnect(struct unpcb *unp, int error)
1173 struct socket *so = unp->unp_socket;
1176 ASSERT_LWKT_TOKEN_HELD(&unp_token);
1177 UNP_ASSERT_TOKEN_HELD(unp);
1180 so->so_error = error;
1182 while ((unp2 = unp->unp_conn) != NULL) {
1183 lwkt_getpooltoken(unp2);
1184 if (unp2 == unp->unp_conn)
1186 lwkt_relpooltoken(unp2);
1190 /* unp2 is locked. */
1192 KASSERT((unp2->unp_flags & UNP_DROPPED) == 0, ("unp2 was dropped"));
1194 unp->unp_conn = NULL;
1196 switch (so->so_type) {
1198 LIST_REMOVE(unp, unp_reflink);
1199 soclrstate(so, SS_ISCONNECTED);
1203 case SOCK_SEQPACKET:
1205 * Keep a reference before clearing the unp_conn
1206 * to avoid racing uipc_detach()/uipc_abort() in
1209 unp_reference(unp2);
1210 KASSERT(unp2->unp_conn == unp, ("unp_conn mismatch"));
1211 unp2->unp_conn = NULL;
1213 soisdisconnected(so);
1214 soisdisconnected(unp2->unp_socket);
1220 lwkt_relpooltoken(unp2);
1225 unp_abort(struct unpcb *unp)
1227 lwkt_gettoken(&unp_token);
1229 lwkt_reltoken(&unp_token);
1234 prison_unpcb(struct thread *td, struct unpcb *unp)
1240 if ((p = td->td_proc) == NULL)
1242 if (!p->p_ucred->cr_prison)
1244 if (p->p_fd->fd_rdir == unp->unp_rvnode)
1250 unp_pcblist(SYSCTL_HANDLER_ARGS)
1253 struct unpcb *unp, **unp_list;
1255 struct unp_head *head;
1257 head = ((intptr_t)arg1 == SOCK_DGRAM ? &unp_dhead : &unp_shead);
1259 KKASSERT(curproc != NULL);
1262 * The process of preparing the PCB list is too time-consuming and
1263 * resource-intensive to repeat twice on every request.
1265 if (req->oldptr == NULL) {
1267 req->oldidx = (n + n/8) * sizeof(struct xunpcb);
1271 if (req->newptr != NULL)
1274 lwkt_gettoken(&unp_token);
1277 * OK, now we're committed to doing something.
1279 gencnt = unp_gencnt;
1282 unp_list = kmalloc(n * sizeof *unp_list, M_TEMP, M_WAITOK);
1284 for (unp = LIST_FIRST(head), i = 0; unp && i < n;
1285 unp = LIST_NEXT(unp, unp_link)) {
1286 if (unp->unp_gencnt <= gencnt && !prison_unpcb(req->td, unp))
1287 unp_list[i++] = unp;
1289 n = i; /* in case we lost some during malloc */
1292 for (i = 0; i < n; i++) {
1294 if (unp->unp_gencnt <= gencnt) {
1296 xu.xu_len = sizeof xu;
1299 * XXX - need more locking here to protect against
1300 * connect/disconnect races for SMP.
1303 bcopy(unp->unp_addr, &xu.xu_addr,
1304 unp->unp_addr->sun_len);
1305 if (unp->unp_conn && unp->unp_conn->unp_addr)
1306 bcopy(unp->unp_conn->unp_addr,
1308 unp->unp_conn->unp_addr->sun_len);
1309 bcopy(unp, &xu.xu_unp, sizeof *unp);
1310 sotoxsocket(unp->unp_socket, &xu.xu_socket);
1311 error = SYSCTL_OUT(req, &xu, sizeof xu);
1314 lwkt_reltoken(&unp_token);
1315 kfree(unp_list, M_TEMP);
1320 SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLFLAG_RD,
1321 (caddr_t)(long)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb",
1322 "List of active local datagram sockets");
1323 SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLFLAG_RD,
1324 (caddr_t)(long)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb",
1325 "List of active local stream sockets");
1326 SYSCTL_PROC(_net_local_seqpacket, OID_AUTO, pcblist, CTLFLAG_RD,
1327 (caddr_t)(long)SOCK_SEQPACKET, 0, unp_pcblist, "S,xunpcb",
1328 "List of active local seqpacket stream sockets");
1331 unp_shutdown(struct unpcb *unp)
1335 if ((unp->unp_socket->so_type == SOCK_STREAM ||
1336 unp->unp_socket->so_type == SOCK_SEQPACKET) &&
1337 unp->unp_conn != NULL && (so = unp->unp_conn->unp_socket)) {
1346 lwkt_gettoken(&unp_token);
1347 lwkt_reltoken(&unp_token);
1352 unp_externalize(struct mbuf *rights)
1354 struct thread *td = curthread;
1355 struct proc *p = td->td_proc; /* XXX */
1356 struct lwp *lp = td->td_lwp;
1357 struct cmsghdr *cm = mtod(rights, struct cmsghdr *);
1362 int newfds = (cm->cmsg_len - (CMSG_DATA(cm) - (u_char *)cm))
1363 / sizeof (struct file *);
1366 lwkt_gettoken(&unp_token);
1369 * if the new FD's will not fit, then we free them all
1371 if (!fdavail(p, newfds)) {
1372 rp = (struct file **)CMSG_DATA(cm);
1373 for (i = 0; i < newfds; i++) {
1376 * zero the pointer before calling unp_discard,
1377 * since it may end up in unp_gc()..
1380 unp_discard(fp, NULL);
1382 lwkt_reltoken(&unp_token);
1387 * now change each pointer to an fd in the global table to
1388 * an integer that is the index to the local fd table entry
1389 * that we set up to point to the global one we are transferring.
1390 * If sizeof (struct file *) is bigger than or equal to sizeof int,
1391 * then do it in forward order. In that case, an integer will
1392 * always come in the same place or before its corresponding
1393 * struct file pointer.
1394 * If sizeof (struct file *) is smaller than sizeof int, then
1395 * do it in reverse order.
1397 if (sizeof (struct file *) >= sizeof (int)) {
1398 fdp = (int *)CMSG_DATA(cm);
1399 rp = (struct file **)CMSG_DATA(cm);
1400 for (i = 0; i < newfds; i++) {
1401 if (fdalloc(p, 0, &f))
1402 panic("unp_externalize");
1404 unp_fp_externalize(lp, fp, f);
1408 fdp = (int *)CMSG_DATA(cm) + newfds - 1;
1409 rp = (struct file **)CMSG_DATA(cm) + newfds - 1;
1410 for (i = 0; i < newfds; i++) {
1411 if (fdalloc(p, 0, &f))
1412 panic("unp_externalize");
1414 unp_fp_externalize(lp, fp, f);
1420 * Adjust length, in case sizeof(struct file *) and sizeof(int)
1423 cm->cmsg_len = CMSG_LEN(newfds * sizeof(int));
1424 rights->m_len = cm->cmsg_len;
1426 lwkt_reltoken(&unp_token);
1431 unp_fp_externalize(struct lwp *lp, struct file *fp, int fd)
1436 lwkt_gettoken(&unp_token);
1440 if (fp->f_flag & FREVOKED) {
1441 kprintf("Warning: revoked fp exiting unix socket\n");
1443 error = falloc(lp, &fx, NULL);
1445 fsetfd(lp->lwp_proc->p_fd, fx, fd);
1447 fsetfd(lp->lwp_proc->p_fd, NULL, fd);
1450 fsetfd(lp->lwp_proc->p_fd, fp, fd);
1453 spin_lock(&unp_spin);
1456 spin_unlock(&unp_spin);
1459 lwkt_reltoken(&unp_token);
1466 LIST_INIT(&unp_dhead);
1467 LIST_INIT(&unp_shead);
1468 spin_init(&unp_spin, "unpinit");
1472 unp_internalize(struct mbuf *control, struct thread *td)
1474 struct proc *p = td->td_proc;
1475 struct filedesc *fdescp;
1476 struct cmsghdr *cm = mtod(control, struct cmsghdr *);
1480 struct cmsgcred *cmcred;
1486 lwkt_gettoken(&unp_token);
1489 if ((cm->cmsg_type != SCM_RIGHTS && cm->cmsg_type != SCM_CREDS) ||
1490 cm->cmsg_level != SOL_SOCKET ||
1491 CMSG_ALIGN(cm->cmsg_len) != control->m_len) {
1497 * Fill in credential information.
1499 if (cm->cmsg_type == SCM_CREDS) {
1500 cmcred = (struct cmsgcred *)CMSG_DATA(cm);
1501 cmcred->cmcred_pid = p->p_pid;
1502 cmcred->cmcred_uid = p->p_ucred->cr_ruid;
1503 cmcred->cmcred_gid = p->p_ucred->cr_rgid;
1504 cmcred->cmcred_euid = p->p_ucred->cr_uid;
1505 cmcred->cmcred_ngroups = MIN(p->p_ucred->cr_ngroups,
1507 for (i = 0; i < cmcred->cmcred_ngroups; i++)
1508 cmcred->cmcred_groups[i] = p->p_ucred->cr_groups[i];
1514 * cmsghdr may not be aligned, do not allow calculation(s) to
1517 if (cm->cmsg_len < CMSG_LEN(0)) {
1522 oldfds = (cm->cmsg_len - CMSG_LEN(0)) / sizeof (int);
1525 * check that all the FDs passed in refer to legal OPEN files
1526 * If not, reject the entire operation.
1528 fdp = (int *)CMSG_DATA(cm);
1529 for (i = 0; i < oldfds; i++) {
1531 if ((unsigned)fd >= fdescp->fd_nfiles ||
1532 fdescp->fd_files[fd].fp == NULL) {
1536 if (fdescp->fd_files[fd].fp->f_type == DTYPE_KQUEUE) {
1542 * Now replace the integer FDs with pointers to
1543 * the associated global file table entry..
1544 * Allocate a bigger buffer as necessary. But if an cluster is not
1545 * enough, return E2BIG.
1547 newlen = CMSG_LEN(oldfds * sizeof(struct file *));
1548 if (newlen > MCLBYTES) {
1552 if (newlen - control->m_len > M_TRAILINGSPACE(control)) {
1553 if (control->m_flags & M_EXT) {
1557 MCLGET(control, M_WAITOK);
1558 if (!(control->m_flags & M_EXT)) {
1563 /* copy the data to the cluster */
1564 memcpy(mtod(control, char *), cm, cm->cmsg_len);
1565 cm = mtod(control, struct cmsghdr *);
1569 * Adjust length, in case sizeof(struct file *) and sizeof(int)
1572 cm->cmsg_len = newlen;
1573 control->m_len = CMSG_ALIGN(newlen);
1576 * Transform the file descriptors into struct file pointers.
1577 * If sizeof (struct file *) is bigger than or equal to sizeof int,
1578 * then do it in reverse order so that the int won't get until
1580 * If sizeof (struct file *) is smaller than sizeof int, then
1581 * do it in forward order.
1583 if (sizeof (struct file *) >= sizeof (int)) {
1584 fdp = (int *)CMSG_DATA(cm) + oldfds - 1;
1585 rp = (struct file **)CMSG_DATA(cm) + oldfds - 1;
1586 for (i = 0; i < oldfds; i++) {
1587 fp = fdescp->fd_files[*fdp--].fp;
1590 spin_lock(&unp_spin);
1593 spin_unlock(&unp_spin);
1596 fdp = (int *)CMSG_DATA(cm);
1597 rp = (struct file **)CMSG_DATA(cm);
1598 for (i = 0; i < oldfds; i++) {
1599 fp = fdescp->fd_files[*fdp++].fp;
1602 spin_lock(&unp_spin);
1605 spin_unlock(&unp_spin);
1610 lwkt_reltoken(&unp_token);
1615 * Garbage collect in-transit file descriptors that get lost due to
1616 * loops (i.e. when a socket is sent to another process over itself,
1617 * and more complex situations).
1619 * NOT MPSAFE - TODO socket flush code and maybe closef. Rest is MPSAFE.
1622 struct unp_gc_info {
1623 struct file **extra_ref;
1624 struct file *locked_fp;
1633 struct unp_gc_info info;
1634 static boolean_t unp_gcing;
1639 * Only one gc can be in-progress at any given moment
1641 spin_lock(&unp_spin);
1643 spin_unlock(&unp_spin);
1647 spin_unlock(&unp_spin);
1649 lwkt_gettoken(&unp_token);
1652 * Before going through all this, set all FDs to be NOT defered
1653 * and NOT externally accessible (not marked). During the scan
1654 * a fd can be marked externally accessible but we may or may not
1655 * be able to immediately process it (controlled by FDEFER).
1657 * If we loop sleep a bit. The complexity of the topology can cause
1658 * multiple loops. Also failure to acquire the socket's so_rcv
1659 * token can cause us to loop.
1661 allfiles_scan_exclusive(unp_gc_clearmarks, NULL);
1664 allfiles_scan_exclusive(unp_gc_checkmarks, &info);
1666 tsleep(&info, 0, "gcagain", 1);
1667 } while (info.defer);
1670 * We grab an extra reference to each of the file table entries
1671 * that are not otherwise accessible and then free the rights
1672 * that are stored in messages on them.
1674 * The bug in the orginal code is a little tricky, so I'll describe
1675 * what's wrong with it here.
1677 * It is incorrect to simply unp_discard each entry for f_msgcount
1678 * times -- consider the case of sockets A and B that contain
1679 * references to each other. On a last close of some other socket,
1680 * we trigger a gc since the number of outstanding rights (unp_rights)
1681 * is non-zero. If during the sweep phase the gc code un_discards,
1682 * we end up doing a (full) closef on the descriptor. A closef on A
1683 * results in the following chain. Closef calls soo_close, which
1684 * calls soclose. Soclose calls first (through the switch
1685 * uipc_usrreq) unp_detach, which re-invokes unp_gc. Unp_gc simply
1686 * returns because the previous instance had set unp_gcing, and
1687 * we return all the way back to soclose, which marks the socket
1688 * with SS_NOFDREF, and then calls sofree. Sofree calls sorflush
1689 * to free up the rights that are queued in messages on the socket A,
1690 * i.e., the reference on B. The sorflush calls via the dom_dispose
1691 * switch unp_dispose, which unp_scans with unp_discard. This second
1692 * instance of unp_discard just calls closef on B.
1694 * Well, a similar chain occurs on B, resulting in a sorflush on B,
1695 * which results in another closef on A. Unfortunately, A is already
1696 * being closed, and the descriptor has already been marked with
1697 * SS_NOFDREF, and soclose panics at this point.
1699 * Here, we first take an extra reference to each inaccessible
1700 * descriptor. Then, we call sorflush ourself, since we know
1701 * it is a Unix domain socket anyhow. After we destroy all the
1702 * rights carried in messages, we do a last closef to get rid
1703 * of our extra reference. This is the last close, and the
1704 * unp_detach etc will shut down the socket.
1706 * 91/09/19, bsy@cs.cmu.edu
1708 info.extra_ref = kmalloc(256 * sizeof(struct file *), M_FILE, M_WAITOK);
1709 info.maxindex = 256;
1716 allfiles_scan_exclusive(unp_gc_checkrefs, &info);
1719 * For each FD on our hit list, do the following two things
1721 for (i = info.index, fpp = info.extra_ref; --i >= 0; ++fpp) {
1722 struct file *tfp = *fpp;
1723 if (tfp->f_type == DTYPE_SOCKET && tfp->f_data != NULL)
1724 sorflush((struct socket *)(tfp->f_data));
1726 for (i = info.index, fpp = info.extra_ref; --i >= 0; ++fpp)
1728 } while (info.index == info.maxindex);
1730 lwkt_reltoken(&unp_token);
1732 kfree((caddr_t)info.extra_ref, M_FILE);
1737 * MPSAFE - NOTE: filehead list and file pointer spinlocked on entry
1740 unp_gc_checkrefs(struct file *fp, void *data)
1742 struct unp_gc_info *info = data;
1744 if (fp->f_count == 0)
1746 if (info->index == info->maxindex)
1750 * If all refs are from msgs, and it's not marked accessible
1751 * then it must be referenced from some unreachable cycle
1752 * of (shut-down) FDs, so include it in our
1753 * list of FDs to remove
1755 if (fp->f_count == fp->f_msgcount && !(fp->f_flag & FMARK)) {
1756 info->extra_ref[info->index++] = fp;
1763 * MPSAFE - NOTE: filehead list and file pointer spinlocked on entry
1766 unp_gc_clearmarks(struct file *fp, void *data __unused)
1768 atomic_clear_int(&fp->f_flag, FMARK | FDEFER);
1773 * MPSAFE - NOTE: filehead list and file pointer spinlocked on entry
1776 unp_gc_checkmarks(struct file *fp, void *data)
1778 struct unp_gc_info *info = data;
1782 * If the file is not open, skip it. Make sure it isn't marked
1783 * defered or we could loop forever, in case we somehow race
1786 if (fp->f_count == 0) {
1787 if (fp->f_flag & FDEFER)
1788 atomic_clear_int(&fp->f_flag, FDEFER);
1792 * If we already marked it as 'defer' in a
1793 * previous pass, then try process it this time
1796 if (fp->f_flag & FDEFER) {
1797 atomic_clear_int(&fp->f_flag, FDEFER);
1800 * if it's not defered, then check if it's
1801 * already marked.. if so skip it
1803 if (fp->f_flag & FMARK)
1806 * If all references are from messages
1807 * in transit, then skip it. it's not
1808 * externally accessible.
1810 if (fp->f_count == fp->f_msgcount)
1813 * If it got this far then it must be
1814 * externally accessible.
1816 atomic_set_int(&fp->f_flag, FMARK);
1820 * either it was defered, or it is externally
1821 * accessible and not already marked so.
1822 * Now check if it is possibly one of OUR sockets.
1824 if (fp->f_type != DTYPE_SOCKET ||
1825 (so = (struct socket *)fp->f_data) == NULL) {
1828 if (so->so_proto->pr_domain != &localdomain ||
1829 !(so->so_proto->pr_flags & PR_RIGHTS)) {
1834 * So, Ok, it's one of our sockets and it IS externally accessible
1835 * (or was defered). Now we look to see if we hold any file
1836 * descriptors in its message buffers. Follow those links and mark
1837 * them as accessible too.
1839 * We are holding multiple spinlocks here, if we cannot get the
1840 * token non-blocking defer until the next loop.
1842 info->locked_fp = fp;
1843 if (lwkt_trytoken(&so->so_rcv.ssb_token)) {
1844 unp_scan(so->so_rcv.ssb_mb, unp_mark, info);
1845 lwkt_reltoken(&so->so_rcv.ssb_token);
1847 atomic_set_int(&fp->f_flag, FDEFER);
1854 * Scan all unix domain sockets and replace any revoked file pointers
1855 * found with the dummy file pointer fx. We don't worry about races
1856 * against file pointers being read out as those are handled in the
1860 #define REVOKE_GC_MAXFILES 32
1862 struct unp_revoke_gc_info {
1864 struct file *fary[REVOKE_GC_MAXFILES];
1869 unp_revoke_gc(struct file *fx)
1871 struct unp_revoke_gc_info info;
1874 lwkt_gettoken(&unp_token);
1878 allfiles_scan_exclusive(unp_revoke_gc_check, &info);
1879 for (i = 0; i < info.fcount; ++i)
1880 unp_fp_externalize(NULL, info.fary[i], -1);
1881 } while (info.fcount == REVOKE_GC_MAXFILES);
1882 lwkt_reltoken(&unp_token);
1886 * Check for and replace revoked descriptors.
1888 * WARNING: This routine is not allowed to block.
1891 unp_revoke_gc_check(struct file *fps, void *vinfo)
1893 struct unp_revoke_gc_info *info = vinfo;
1904 * Is this a unix domain socket with rights-passing abilities?
1906 if (fps->f_type != DTYPE_SOCKET)
1908 if ((so = (struct socket *)fps->f_data) == NULL)
1910 if (so->so_proto->pr_domain != &localdomain)
1912 if ((so->so_proto->pr_flags & PR_RIGHTS) == 0)
1916 * Scan the mbufs for control messages and replace any revoked
1917 * descriptors we find.
1919 lwkt_gettoken(&so->so_rcv.ssb_token);
1920 m0 = so->so_rcv.ssb_mb;
1922 for (m = m0; m; m = m->m_next) {
1923 if (m->m_type != MT_CONTROL)
1925 if (m->m_len < sizeof(*cm))
1927 cm = mtod(m, struct cmsghdr *);
1928 if (cm->cmsg_level != SOL_SOCKET ||
1929 cm->cmsg_type != SCM_RIGHTS) {
1932 qfds = (cm->cmsg_len - CMSG_LEN(0)) / sizeof(void *);
1933 rp = (struct file **)CMSG_DATA(cm);
1934 for (i = 0; i < qfds; i++) {
1936 if (fp->f_flag & FREVOKED) {
1937 kprintf("Warning: Removing revoked fp from unix domain socket queue\n");
1939 info->fx->f_msgcount++;
1942 info->fary[info->fcount++] = fp;
1944 if (info->fcount == REVOKE_GC_MAXFILES)
1947 if (info->fcount == REVOKE_GC_MAXFILES)
1951 if (info->fcount == REVOKE_GC_MAXFILES)
1954 lwkt_reltoken(&so->so_rcv.ssb_token);
1957 * Stop the scan if we filled up our array.
1959 if (info->fcount == REVOKE_GC_MAXFILES)
1965 * Dispose of the fp's stored in a mbuf.
1967 * The dds loop can cause additional fps to be entered onto the
1968 * list while it is running, flattening out the operation and avoiding
1969 * a deep kernel stack recursion.
1972 unp_dispose(struct mbuf *m)
1974 unp_defdiscard_t dds;
1976 lwkt_gettoken(&unp_token);
1977 ++unp_defdiscard_nest;
1979 unp_scan(m, unp_discard, NULL);
1981 if (unp_defdiscard_nest == 1) {
1982 while ((dds = unp_defdiscard_base) != NULL) {
1983 unp_defdiscard_base = dds->next;
1984 closef(dds->fp, NULL);
1985 kfree(dds, M_UNPCB);
1988 --unp_defdiscard_nest;
1989 lwkt_reltoken(&unp_token);
1993 unp_listen(struct unpcb *unp, struct thread *td)
1995 struct proc *p = td->td_proc;
1998 lwkt_gettoken(&unp_token);
1999 cru2x(p->p_ucred, &unp->unp_peercred);
2000 unp_setflags(unp, UNP_HAVEPCCACHED);
2001 lwkt_reltoken(&unp_token);
2006 unp_scan(struct mbuf *m0, void (*op)(struct file *, void *), void *data)
2015 for (m = m0; m; m = m->m_next) {
2016 if (m->m_type == MT_CONTROL &&
2017 m->m_len >= sizeof(*cm)) {
2018 cm = mtod(m, struct cmsghdr *);
2019 if (cm->cmsg_level != SOL_SOCKET ||
2020 cm->cmsg_type != SCM_RIGHTS)
2022 qfds = (cm->cmsg_len - CMSG_LEN(0)) /
2024 rp = (struct file **)CMSG_DATA(cm);
2025 for (i = 0; i < qfds; i++)
2027 break; /* XXX, but saves time */
2035 * Mark visibility. info->defer is recalculated on every pass.
2038 unp_mark(struct file *fp, void *data)
2040 struct unp_gc_info *info = data;
2042 if ((fp->f_flag & FMARK) == 0) {
2044 atomic_set_int(&fp->f_flag, FMARK | FDEFER);
2045 } else if (fp->f_flag & FDEFER) {
2051 * Discard a fp previously held in a unix domain socket mbuf. To
2052 * avoid blowing out the kernel stack due to contrived chain-reactions
2053 * we may have to defer the operation to a higher procedural level.
2055 * Caller holds unp_token
2058 unp_discard(struct file *fp, void *data __unused)
2060 unp_defdiscard_t dds;
2062 spin_lock(&unp_spin);
2065 spin_unlock(&unp_spin);
2067 if (unp_defdiscard_nest) {
2068 dds = kmalloc(sizeof(*dds), M_UNPCB, M_WAITOK|M_ZERO);
2070 dds->next = unp_defdiscard_base;
2071 unp_defdiscard_base = dds;
2078 unp_find_lockref(struct sockaddr *nam, struct thread *td, short type,
2079 struct unpcb **unp_ret)
2081 struct proc *p = td->td_proc;
2082 struct sockaddr_un *soun = (struct sockaddr_un *)nam;
2083 struct vnode *vp = NULL;
2087 struct nlookupdata nd;
2088 char buf[SOCK_MAXADDRLEN];
2092 len = nam->sa_len - offsetof(struct sockaddr_un, sun_path);
2097 strncpy(buf, soun->sun_path, len);
2100 error = nlookup_init(&nd, buf, UIO_SYSSPACE, NLC_FOLLOW);
2102 error = nlookup(&nd);
2104 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp);
2111 if (vp->v_type != VSOCK) {
2115 error = VOP_EACCESS(vp, VWRITE, p->p_ucred);
2120 error = ECONNREFUSED;
2123 if (so->so_type != type) {
2128 /* Lock this unp. */
2129 unp = unp_getsocktoken(so);
2130 if (!UNP_ISATTACHED(unp)) {
2132 error = ECONNREFUSED;
2135 /* And keep this unp referenced. */
2148 unp_connect_pair(struct unpcb *unp, struct unpcb *unp2)
2150 struct socket *so = unp->unp_socket;
2151 struct socket *so2 = unp2->unp_socket;
2153 ASSERT_LWKT_TOKEN_HELD(&unp_token);
2154 UNP_ASSERT_TOKEN_HELD(unp);
2155 UNP_ASSERT_TOKEN_HELD(unp2);
2157 KASSERT(so->so_type == so2->so_type,
2158 ("socket type mismatch, so %d, so2 %d", so->so_type, so2->so_type));
2160 if (!UNP_ISATTACHED(unp))
2162 if (!UNP_ISATTACHED(unp2))
2163 return ECONNREFUSED;
2165 KASSERT(unp->unp_conn == NULL, ("unp is already connected"));
2166 unp->unp_conn = unp2;
2168 switch (so->so_type) {
2170 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink);
2175 case SOCK_SEQPACKET:
2176 KASSERT(unp2->unp_conn == NULL, ("unp2 is already connected"));
2177 unp2->unp_conn = unp;
2183 panic("unp_connect_pair: unknown socket type %d", so->so_type);
2189 unp_drop(struct unpcb *unp, int error)
2193 ASSERT_LWKT_TOKEN_HELD(&unp_token);
2194 UNP_ASSERT_TOKEN_HELD(unp);
2195 KASSERT(unp->unp_flags & UNP_DETACHED, ("unp is not detached"));
2197 unp_disconnect(unp, error);
2199 while ((unp2 = LIST_FIRST(&unp->unp_refs)) != NULL) {
2200 lwkt_getpooltoken(unp2);
2201 unp_disconnect(unp2, ECONNRESET);
2202 lwkt_relpooltoken(unp2);
2204 unp_setflags(unp, UNP_DROPPED);