2 * Copyright (c) 2004 Jeffrey M. Hsu. All rights reserved.
3 * Copyright (c) 2004 The DragonFly Project. All rights reserved.
5 * This code is derived from software contributed to The DragonFly Project
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of The DragonFly Project nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific, prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * Copyright (c) 1982, 1986, 1988, 1990, 1993
36 * The Regents of the University of California. All rights reserved.
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. All advertising materials mentioning features or use of this software
47 * must display the following acknowledgement:
48 * This product includes software developed by the University of
49 * California, Berkeley and its contributors.
50 * 4. Neither the name of the University nor the names of its contributors
51 * may be used to endorse or promote products derived from this software
52 * without specific prior written permission.
54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
66 * @(#)uipc_socket.c 8.3 (Berkeley) 4/15/94
67 * $FreeBSD: src/sys/kern/uipc_socket.c,v 1.68.2.24 2003/11/11 17:18:18 silby Exp $
73 #include <sys/param.h>
74 #include <sys/systm.h>
75 #include <sys/fcntl.h>
76 #include <sys/malloc.h>
78 #include <sys/domain.h>
79 #include <sys/file.h> /* for struct knote */
80 #include <sys/kernel.h>
81 #include <sys/event.h>
83 #include <sys/protosw.h>
84 #include <sys/socket.h>
85 #include <sys/socketvar.h>
86 #include <sys/socketops.h>
87 #include <sys/resourcevar.h>
88 #include <sys/signalvar.h>
89 #include <sys/sysctl.h>
92 #include <vm/vm_zone.h>
94 #include <net/netmsg2.h>
96 #include <sys/thread2.h>
97 #include <sys/socketvar2.h>
98 #include <sys/spinlock2.h>
100 #include <machine/limits.h>
102 extern int tcp_sosend_agglim;
103 extern int tcp_sosend_async;
104 extern int udp_sosend_async;
105 extern int udp_sosend_prepend;
108 static int do_setopt_accept_filter(struct socket *so, struct sockopt *sopt);
111 static void filt_sordetach(struct knote *kn);
112 static int filt_soread(struct knote *kn, long hint);
113 static void filt_sowdetach(struct knote *kn);
114 static int filt_sowrite(struct knote *kn, long hint);
115 static int filt_solisten(struct knote *kn, long hint);
117 static void sodiscard(struct socket *so);
118 static int soclose_sync(struct socket *so, int fflag);
119 static void soclose_fast(struct socket *so);
121 static struct filterops solisten_filtops =
122 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_sordetach, filt_solisten };
123 static struct filterops soread_filtops =
124 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_sordetach, filt_soread };
125 static struct filterops sowrite_filtops =
126 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_sowdetach, filt_sowrite };
127 static struct filterops soexcept_filtops =
128 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_sordetach, filt_soread };
130 MALLOC_DEFINE(M_SOCKET, "socket", "socket struct");
131 MALLOC_DEFINE(M_SONAME, "soname", "socket name");
132 MALLOC_DEFINE(M_PCB, "pcb", "protocol control block");
135 static int somaxconn = SOMAXCONN;
136 SYSCTL_INT(_kern_ipc, KIPC_SOMAXCONN, somaxconn, CTLFLAG_RW,
137 &somaxconn, 0, "Maximum pending socket connection queue size");
139 static int use_soclose_fast = 1;
140 SYSCTL_INT(_kern_ipc, OID_AUTO, soclose_fast, CTLFLAG_RW,
141 &use_soclose_fast, 0, "Fast socket close");
143 int use_soaccept_pred_fast = 1;
144 SYSCTL_INT(_kern_ipc, OID_AUTO, soaccept_pred_fast, CTLFLAG_RW,
145 &use_soaccept_pred_fast, 0, "Fast socket accept predication");
147 int use_sendfile_async = 1;
148 SYSCTL_INT(_kern_ipc, OID_AUTO, sendfile_async, CTLFLAG_RW,
149 &use_sendfile_async, 0, "sendfile uses asynchronized pru_send");
152 * Socket operation routines.
153 * These routines are called by the routines in
154 * sys_socket.c or from a system process, and
155 * implement the semantics of socket operations by
156 * switching out to the protocol specific routines.
160 * Get a socket structure, and initialize it.
161 * Note that it would probably be better to allocate socket
162 * and PCB at the same time, but I'm not convinced that all
163 * the protocols can be easily modified to do this.
166 soalloc(int waitok, struct protosw *pr)
171 waitmask = waitok ? M_WAITOK : M_NOWAIT;
172 so = kmalloc(sizeof(struct socket), M_SOCKET, M_ZERO|waitmask);
174 /* XXX race condition for reentrant kernel */
176 TAILQ_INIT(&so->so_aiojobq);
177 TAILQ_INIT(&so->so_rcv.ssb_kq.ki_mlist);
178 TAILQ_INIT(&so->so_snd.ssb_kq.ki_mlist);
179 lwkt_token_init(&so->so_rcv.ssb_token, "rcvtok");
180 lwkt_token_init(&so->so_snd.ssb_token, "sndtok");
181 spin_init(&so->so_rcvd_spin);
182 netmsg_init(&so->so_rcvd_msg.base, so, &netisr_adone_rport,
183 MSGF_DROPABLE, so->so_proto->pr_usrreqs->pru_rcvd);
184 so->so_rcvd_msg.nm_pru_flags |= PRUR_ASYNC;
185 so->so_state = SS_NOFDREF;
192 socreate(int dom, struct socket **aso, int type,
193 int proto, struct thread *td)
195 struct proc *p = td->td_proc;
198 struct pru_attach_info ai;
202 prp = pffindproto(dom, proto, type);
204 prp = pffindtype(dom, type);
206 if (prp == NULL || prp->pr_usrreqs->pru_attach == 0)
207 return (EPROTONOSUPPORT);
209 if (p->p_ucred->cr_prison && jail_socket_unixiproute_only &&
210 prp->pr_domain->dom_family != PF_LOCAL &&
211 prp->pr_domain->dom_family != PF_INET &&
212 prp->pr_domain->dom_family != PF_INET6 &&
213 prp->pr_domain->dom_family != PF_ROUTE) {
214 return (EPROTONOSUPPORT);
217 if (prp->pr_type != type)
219 so = soalloc(p != NULL, prp);
224 * Callers of socreate() presumably will connect up a descriptor
225 * and call soclose() if they cannot. This represents our so_refs
226 * (which should be 1) from soalloc().
228 soclrstate(so, SS_NOFDREF);
231 * Set a default port for protocol processing. No action will occur
232 * on the socket on this port until an inpcb is attached to it and
233 * is able to match incoming packets, or until the socket becomes
234 * available to userland.
236 * We normally default the socket to the protocol thread on cpu 0.
237 * If PR_SYNC_PORT is set (unix domain sockets) there is no protocol
238 * thread and all pr_*()/pru_*() calls are executed synchronously.
240 if (prp->pr_flags & PR_SYNC_PORT)
241 so->so_port = &netisr_sync_port;
243 so->so_port = netisr_portfn(0);
245 TAILQ_INIT(&so->so_incomp);
246 TAILQ_INIT(&so->so_comp);
248 so->so_cred = crhold(p->p_ucred);
249 ai.sb_rlimit = &p->p_rlimit[RLIMIT_SBSIZE];
250 ai.p_ucred = p->p_ucred;
251 ai.fd_rdir = p->p_fd->fd_rdir;
254 * Auto-sizing of socket buffers is managed by the protocols and
255 * the appropriate flags must be set in the pru_attach function.
257 error = so_pru_attach(so, proto, &ai);
259 sosetstate(so, SS_NOFDREF);
260 sofree(so); /* from soalloc */
265 * NOTE: Returns referenced socket.
272 sobind(struct socket *so, struct sockaddr *nam, struct thread *td)
276 error = so_pru_bind(so, nam, td);
281 sodealloc(struct socket *so)
283 if (so->so_rcv.ssb_hiwat)
284 (void)chgsbsize(so->so_cred->cr_uidinfo,
285 &so->so_rcv.ssb_hiwat, 0, RLIM_INFINITY);
286 if (so->so_snd.ssb_hiwat)
287 (void)chgsbsize(so->so_cred->cr_uidinfo,
288 &so->so_snd.ssb_hiwat, 0, RLIM_INFINITY);
290 /* remove accept filter if present */
291 if (so->so_accf != NULL)
292 do_setopt_accept_filter(so, NULL);
295 if (so->so_faddr != NULL)
296 kfree(so->so_faddr, M_SONAME);
301 solisten(struct socket *so, int backlog, struct thread *td)
305 short oldopt, oldqlimit;
308 if (so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING))
312 oldopt = so->so_options;
313 oldqlimit = so->so_qlimit;
316 lwkt_gettoken(&so->so_rcv.ssb_token);
317 if (TAILQ_EMPTY(&so->so_comp))
318 so->so_options |= SO_ACCEPTCONN;
319 lwkt_reltoken(&so->so_rcv.ssb_token);
320 if (backlog < 0 || backlog > somaxconn)
322 so->so_qlimit = backlog;
323 /* SCTP needs to look at tweak both the inbound backlog parameter AND
324 * the so_options (UDP model both connect's and gets inbound
325 * connections .. implicitly).
327 error = so_pru_listen(so, td);
330 /* Restore the params */
331 so->so_options = oldopt;
332 so->so_qlimit = oldqlimit;
340 * Destroy a disconnected socket. This routine is a NOP if entities
341 * still have a reference on the socket:
343 * so_pcb - The protocol stack still has a reference
344 * SS_NOFDREF - There is no longer a file pointer reference
347 sofree(struct socket *so)
352 * This is a bit hackish at the moment. We need to interlock
353 * any accept queue we are on before we potentially lose the
354 * last reference to avoid races against a re-reference from
355 * someone operating on the queue.
357 while ((head = so->so_head) != NULL) {
358 lwkt_getpooltoken(head);
359 if (so->so_head == head)
361 lwkt_relpooltoken(head);
365 * Arbitrage the last free.
367 KKASSERT(so->so_refs > 0);
368 if (atomic_fetchadd_int(&so->so_refs, -1) != 1) {
370 lwkt_relpooltoken(head);
374 KKASSERT(so->so_pcb == NULL && (so->so_state & SS_NOFDREF));
375 KKASSERT((so->so_state & SS_ASSERTINPROG) == 0);
378 * We're done, remove ourselves from the accept queue we are
379 * on, if we are on one.
382 if (so->so_state & SS_INCOMP) {
383 TAILQ_REMOVE(&head->so_incomp, so, so_list);
385 } else if (so->so_state & SS_COMP) {
387 * We must not decommission a socket that's
388 * on the accept(2) queue. If we do, then
389 * accept(2) may hang after select(2) indicated
390 * that the listening socket was ready.
392 lwkt_relpooltoken(head);
395 panic("sofree: not queued");
397 soclrstate(so, SS_INCOMP);
399 lwkt_relpooltoken(head);
401 ssb_release(&so->so_snd, so);
407 * Close a socket on last file table reference removal.
408 * Initiate disconnect if connected.
409 * Free socket when disconnect complete.
412 soclose(struct socket *so, int fflag)
416 funsetown(&so->so_sigio);
417 if (!use_soclose_fast ||
418 (so->so_proto->pr_flags & PR_SYNC_PORT) ||
419 (so->so_options & SO_LINGER)) {
420 error = soclose_sync(so, fflag);
429 sodiscard(struct socket *so)
431 lwkt_getpooltoken(so);
432 if (so->so_options & SO_ACCEPTCONN) {
435 while ((sp = TAILQ_FIRST(&so->so_incomp)) != NULL) {
436 TAILQ_REMOVE(&so->so_incomp, sp, so_list);
437 soclrstate(sp, SS_INCOMP);
442 while ((sp = TAILQ_FIRST(&so->so_comp)) != NULL) {
443 TAILQ_REMOVE(&so->so_comp, sp, so_list);
444 soclrstate(sp, SS_COMP);
450 lwkt_relpooltoken(so);
452 if (so->so_state & SS_NOFDREF)
453 panic("soclose: NOFDREF");
454 sosetstate(so, SS_NOFDREF); /* take ref */
458 soclose_sync(struct socket *so, int fflag)
462 if (so->so_pcb == NULL)
464 if (so->so_state & SS_ISCONNECTED) {
465 if ((so->so_state & SS_ISDISCONNECTING) == 0) {
466 error = sodisconnect(so);
470 if (so->so_options & SO_LINGER) {
471 if ((so->so_state & SS_ISDISCONNECTING) &&
474 while (so->so_state & SS_ISCONNECTED) {
475 error = tsleep(&so->so_timeo, PCATCH,
476 "soclos", so->so_linger * hz);
486 error2 = so_pru_detach(so);
492 so_pru_sync(so); /* unpend async sending */
493 sofree(so); /* dispose of ref */
499 soclose_sofree_async_handler(netmsg_t msg)
501 sofree(msg->base.nm_so);
505 soclose_sofree_async(struct socket *so)
507 struct netmsg_base *base = &so->so_clomsg;
509 netmsg_init(base, so, &netisr_apanic_rport, 0,
510 soclose_sofree_async_handler);
511 lwkt_sendmsg(so->so_port, &base->lmsg);
515 soclose_disconn_async_handler(netmsg_t msg)
517 struct socket *so = msg->base.nm_so;
519 if ((so->so_state & SS_ISCONNECTED) &&
520 (so->so_state & SS_ISDISCONNECTING) == 0)
521 so_pru_disconnect_direct(so);
524 so_pru_detach_direct(so);
531 soclose_disconn_async(struct socket *so)
533 struct netmsg_base *base = &so->so_clomsg;
535 netmsg_init(base, so, &netisr_apanic_rport, 0,
536 soclose_disconn_async_handler);
537 lwkt_sendmsg(so->so_port, &base->lmsg);
541 soclose_detach_async_handler(netmsg_t msg)
543 struct socket *so = msg->base.nm_so;
546 so_pru_detach_direct(so);
553 soclose_detach_async(struct socket *so)
555 struct netmsg_base *base = &so->so_clomsg;
557 netmsg_init(base, so, &netisr_apanic_rport, 0,
558 soclose_detach_async_handler);
559 lwkt_sendmsg(so->so_port, &base->lmsg);
563 soclose_fast(struct socket *so)
565 if (so->so_pcb == NULL)
568 if ((so->so_state & SS_ISCONNECTED) &&
569 (so->so_state & SS_ISDISCONNECTING) == 0) {
570 soclose_disconn_async(so);
575 soclose_detach_async(so);
581 soclose_sofree_async(so);
585 * Abort and destroy a socket. Only one abort can be in progress
586 * at any given moment.
589 soabort(struct socket *so)
596 soaborta(struct socket *so)
603 soabort_oncpu(struct socket *so)
606 so_pru_abort_oncpu(so);
610 * so is passed in ref'd, which becomes owned by
611 * the cleared SS_NOFDREF flag.
614 soaccept_generic(struct socket *so)
616 if ((so->so_state & SS_NOFDREF) == 0)
617 panic("soaccept: !NOFDREF");
618 soclrstate(so, SS_NOFDREF); /* owned by lack of SS_NOFDREF */
622 soaccept(struct socket *so, struct sockaddr **nam)
626 soaccept_generic(so);
627 error = so_pru_accept(so, nam);
632 soconnect(struct socket *so, struct sockaddr *nam, struct thread *td)
636 if (so->so_options & SO_ACCEPTCONN)
639 * If protocol is connection-based, can only connect once.
640 * Otherwise, if connected, try to disconnect first.
641 * This allows user to disconnect by connecting to, e.g.,
644 if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
645 ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
646 (error = sodisconnect(so)))) {
650 * Prevent accumulated error from previous connection
654 error = so_pru_connect(so, nam, td);
660 soconnect2(struct socket *so1, struct socket *so2)
664 error = so_pru_connect2(so1, so2);
669 sodisconnect(struct socket *so)
673 if ((so->so_state & SS_ISCONNECTED) == 0) {
677 if (so->so_state & SS_ISDISCONNECTING) {
681 error = so_pru_disconnect(so);
686 #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
689 * If send must go all at once and message is larger than
690 * send buffering, then hard error.
691 * Lock against other senders.
692 * If must go all at once and not enough room now, then
693 * inform user that this would block and do nothing.
694 * Otherwise, if nonblocking, send as much as possible.
695 * The data to be sent is described by "uio" if nonzero,
696 * otherwise by the mbuf chain "top" (which must be null
697 * if uio is not). Data provided in mbuf chain must be small
698 * enough to send all at once.
700 * Returns nonzero on error, timeout or signal; callers
701 * must check for short counts if EINTR/ERESTART are returned.
702 * Data and control buffers are freed on return.
705 sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
706 struct mbuf *top, struct mbuf *control, int flags,
713 int clen = 0, error, dontroute, mlen;
714 int atomic = sosendallatonce(so) || top;
718 resid = uio->uio_resid;
720 resid = (size_t)top->m_pkthdr.len;
723 for (m = top; m; m = m->m_next)
725 KKASSERT(top->m_pkthdr.len == len);
730 * WARNING! resid is unsigned, space and len are signed. space
731 * can wind up negative if the sockbuf is overcommitted.
733 * Also check to make sure that MSG_EOR isn't used on SOCK_STREAM
734 * type sockets since that's an error.
736 if (so->so_type == SOCK_STREAM && (flags & MSG_EOR)) {
742 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
743 (so->so_proto->pr_flags & PR_ATOMIC);
744 if (td->td_lwp != NULL)
745 td->td_lwp->lwp_ru.ru_msgsnd++;
747 clen = control->m_len;
748 #define gotoerr(errcode) { error = errcode; goto release; }
751 error = ssb_lock(&so->so_snd, SBLOCKWAIT(flags));
756 if (so->so_state & SS_CANTSENDMORE)
759 error = so->so_error;
763 if ((so->so_state & SS_ISCONNECTED) == 0) {
765 * `sendto' and `sendmsg' is allowed on a connection-
766 * based socket if it supports implied connect.
767 * Return ENOTCONN if not connected and no address is
770 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) &&
771 (so->so_proto->pr_flags & PR_IMPLOPCL) == 0) {
772 if ((so->so_state & SS_ISCONFIRMING) == 0 &&
773 !(resid == 0 && clen != 0))
775 } else if (addr == NULL)
776 gotoerr(so->so_proto->pr_flags & PR_CONNREQUIRED ?
777 ENOTCONN : EDESTADDRREQ);
779 if ((atomic && resid > so->so_snd.ssb_hiwat) ||
780 clen > so->so_snd.ssb_hiwat) {
783 space = ssb_space(&so->so_snd);
786 if ((space < 0 || (size_t)space < resid + clen) && uio &&
787 (atomic || space < so->so_snd.ssb_lowat || space < clen)) {
788 if (flags & (MSG_FNONBLOCKING|MSG_DONTWAIT))
789 gotoerr(EWOULDBLOCK);
790 ssb_unlock(&so->so_snd);
791 error = ssb_wait(&so->so_snd);
801 * Data is prepackaged in "top".
805 top->m_flags |= M_EOR;
809 m = m_getl((int)resid, MB_WAIT, MT_DATA,
810 top == NULL ? M_PKTHDR : 0, &mlen);
813 m->m_pkthdr.rcvif = NULL;
815 len = imin((int)szmin(mlen, resid), space);
816 if (resid < MINCLSIZE) {
818 * For datagram protocols, leave room
819 * for protocol headers in first mbuf.
821 if (atomic && top == NULL && len < mlen)
825 error = uiomove(mtod(m, caddr_t), (size_t)len, uio);
826 resid = uio->uio_resid;
829 top->m_pkthdr.len += len;
835 top->m_flags |= M_EOR;
838 } while (space > 0 && atomic);
840 so->so_options |= SO_DONTROUTE;
841 if (flags & MSG_OOB) {
842 pru_flags = PRUS_OOB;
843 } else if ((flags & MSG_EOF) &&
844 (so->so_proto->pr_flags & PR_IMPLOPCL) &&
847 * If the user set MSG_EOF, the protocol
848 * understands this flag and nothing left to
849 * send then use PRU_SEND_EOF instead of PRU_SEND.
851 pru_flags = PRUS_EOF;
852 } else if (resid > 0 && space > 0) {
853 /* If there is more to send, set PRUS_MORETOCOME */
854 pru_flags = PRUS_MORETOCOME;
859 * XXX all the SS_CANTSENDMORE checks previously
860 * done could be out of date. We could have recieved
861 * a reset packet in an interrupt or maybe we slept
862 * while doing page faults in uiomove() etc. We could
863 * probably recheck again inside the splnet() protection
864 * here, but there are probably other places that this
865 * also happens. We must rethink this.
867 error = so_pru_send(so, pru_flags, top, addr, control, td);
869 so->so_options &= ~SO_DONTROUTE;
876 } while (resid && space > 0);
880 ssb_unlock(&so->so_snd);
890 * A specialization of sosend() for UDP based on protocol-specific knowledge:
891 * so->so_proto->pr_flags has the PR_ATOMIC field set. This means that
892 * sosendallatonce() returns true,
893 * the "atomic" variable is true,
894 * and sosendudp() blocks until space is available for the entire send.
895 * so->so_proto->pr_flags does not have the PR_CONNREQUIRED or
896 * PR_IMPLOPCL flags set.
897 * UDP has no out-of-band data.
898 * UDP has no control data.
899 * UDP does not support MSG_EOR.
902 sosendudp(struct socket *so, struct sockaddr *addr, struct uio *uio,
903 struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
906 int error, pru_flags = 0;
909 if (td->td_lwp != NULL)
910 td->td_lwp->lwp_ru.ru_msgsnd++;
914 KASSERT((uio && !top) || (top && !uio), ("bad arguments to sosendudp"));
915 resid = uio ? uio->uio_resid : (size_t)top->m_pkthdr.len;
918 error = ssb_lock(&so->so_snd, SBLOCKWAIT(flags));
922 if (so->so_state & SS_CANTSENDMORE)
925 error = so->so_error;
929 if (!(so->so_state & SS_ISCONNECTED) && addr == NULL)
930 gotoerr(EDESTADDRREQ);
931 if (resid > so->so_snd.ssb_hiwat)
933 space = ssb_space(&so->so_snd);
934 if (uio && (space < 0 || (size_t)space < resid)) {
935 if (flags & (MSG_FNONBLOCKING|MSG_DONTWAIT))
936 gotoerr(EWOULDBLOCK);
937 ssb_unlock(&so->so_snd);
938 error = ssb_wait(&so->so_snd);
945 int hdrlen = max_hdr;
948 * We try to optimize out the additional mbuf
949 * allocations in M_PREPEND() on output path, e.g.
950 * - udp_output(), when it tries to prepend protocol
952 * - Link layer output function, when it tries to
953 * prepend link layer header.
955 * This probably will not benefit any data that will
956 * be fragmented, so this optimization is only performed
957 * when the size of data and max size of protocol+link
958 * headers fit into one mbuf cluster.
960 if (uio->uio_resid > MCLBYTES - hdrlen ||
961 !udp_sosend_prepend) {
962 top = m_uiomove(uio);
968 top = m_getl(uio->uio_resid + hdrlen, MB_WAIT,
969 MT_DATA, M_PKTHDR, &nsize);
970 KASSERT(nsize >= uio->uio_resid + hdrlen,
971 ("sosendudp invalid nsize %d, "
972 "resid %zu, hdrlen %d",
973 nsize, uio->uio_resid, hdrlen));
975 top->m_len = uio->uio_resid;
976 top->m_pkthdr.len = uio->uio_resid;
977 top->m_data += hdrlen;
979 error = uiomove(mtod(top, caddr_t), top->m_len, uio);
985 if (flags & MSG_DONTROUTE)
986 pru_flags |= PRUS_DONTROUTE;
988 if (udp_sosend_async && (flags & MSG_SYNC) == 0) {
989 so_pru_send_async(so, pru_flags, top, addr, NULL, td);
992 error = so_pru_send(so, pru_flags, top, addr, NULL, td);
994 top = NULL; /* sent or freed in lower layer */
997 ssb_unlock(&so->so_snd);
1005 sosendtcp(struct socket *so, struct sockaddr *addr, struct uio *uio,
1006 struct mbuf *top, struct mbuf *control, int flags,
1018 KKASSERT(top == NULL);
1020 resid = uio->uio_resid;
1023 resid = (size_t)top->m_pkthdr.len;
1026 for (m = top; m; m = m->m_next)
1028 KKASSERT(top->m_pkthdr.len == len);
1033 * WARNING! resid is unsigned, space and len are signed. space
1034 * can wind up negative if the sockbuf is overcommitted.
1036 * Also check to make sure that MSG_EOR isn't used on TCP
1038 if (flags & MSG_EOR) {
1044 /* TCP doesn't do control messages (rights, creds, etc) */
1045 if (control->m_len) {
1049 m_freem(control); /* empty control, just free it */
1053 if (td->td_lwp != NULL)
1054 td->td_lwp->lwp_ru.ru_msgsnd++;
1056 #define gotoerr(errcode) { error = errcode; goto release; }
1059 error = ssb_lock(&so->so_snd, SBLOCKWAIT(flags));
1064 if (so->so_state & SS_CANTSENDMORE)
1067 error = so->so_error;
1071 if ((so->so_state & SS_ISCONNECTED) == 0 &&
1072 (so->so_state & SS_ISCONFIRMING) == 0)
1074 if (allatonce && resid > so->so_snd.ssb_hiwat)
1077 space = ssb_space_prealloc(&so->so_snd);
1078 if (flags & MSG_OOB)
1080 if ((space < 0 || (size_t)space < resid) && !allatonce &&
1081 space < so->so_snd.ssb_lowat) {
1082 if (flags & (MSG_FNONBLOCKING|MSG_DONTWAIT))
1083 gotoerr(EWOULDBLOCK);
1084 ssb_unlock(&so->so_snd);
1085 error = ssb_wait(&so->so_snd);
1092 int cnt = 0, async = 0;
1096 * Data is prepackaged in "top".
1100 if (resid > INT_MAX)
1102 m = m_getl((int)resid, MB_WAIT, MT_DATA,
1103 top == NULL ? M_PKTHDR : 0, &mlen);
1105 m->m_pkthdr.len = 0;
1106 m->m_pkthdr.rcvif = NULL;
1108 len = imin((int)szmin(mlen, resid), space);
1110 error = uiomove(mtod(m, caddr_t), (size_t)len, uio);
1111 resid = uio->uio_resid;
1114 top->m_pkthdr.len += len;
1121 } while (space > 0 && cnt < tcp_sosend_agglim);
1123 if (tcp_sosend_async)
1126 if (flags & MSG_OOB) {
1127 pru_flags = PRUS_OOB;
1129 } else if ((flags & MSG_EOF) && resid == 0) {
1130 pru_flags = PRUS_EOF;
1131 } else if (resid > 0 && space > 0) {
1132 /* If there is more to send, set PRUS_MORETOCOME */
1133 pru_flags = PRUS_MORETOCOME;
1139 if (flags & MSG_SYNC)
1143 * XXX all the SS_CANTSENDMORE checks previously
1144 * done could be out of date. We could have recieved
1145 * a reset packet in an interrupt or maybe we slept
1146 * while doing page faults in uiomove() etc. We could
1147 * probably recheck again inside the splnet() protection
1148 * here, but there are probably other places that this
1149 * also happens. We must rethink this.
1151 for (m = top; m; m = m->m_next)
1152 ssb_preallocstream(&so->so_snd, m);
1154 error = so_pru_send(so, pru_flags, top,
1157 so_pru_send_async(so, pru_flags, top,
1166 } while (resid && space > 0);
1170 ssb_unlock(&so->so_snd);
1180 * Implement receive operations on a socket.
1182 * We depend on the way that records are added to the signalsockbuf
1183 * by sbappend*. In particular, each record (mbufs linked through m_next)
1184 * must begin with an address if the protocol so specifies,
1185 * followed by an optional mbuf or mbufs containing ancillary data,
1186 * and then zero or more mbufs of data.
1188 * Although the signalsockbuf is locked, new data may still be appended.
1189 * A token inside the ssb_lock deals with MP issues and still allows
1190 * the network to access the socket if we block in a uio.
1192 * The caller may receive the data as a single mbuf chain by supplying
1193 * an mbuf **mp0 for use in returning the chain. The uio is then used
1194 * only for the count in uio_resid.
1197 soreceive(struct socket *so, struct sockaddr **psa, struct uio *uio,
1198 struct sockbuf *sio, struct mbuf **controlp, int *flagsp)
1201 struct mbuf *free_chain = NULL;
1202 int flags, len, error, offset;
1203 struct protosw *pr = so->so_proto;
1205 size_t resid, orig_resid;
1208 resid = uio->uio_resid;
1210 resid = (size_t)(sio->sb_climit - sio->sb_cc);
1218 flags = *flagsp &~ MSG_EOR;
1221 if (flags & MSG_OOB) {
1222 m = m_get(MB_WAIT, MT_DATA);
1225 error = so_pru_rcvoob(so, m, flags & MSG_PEEK);
1231 KKASSERT(resid >= (size_t)m->m_len);
1232 resid -= (size_t)m->m_len;
1233 } while (resid > 0 && m);
1236 uio->uio_resid = resid;
1237 error = uiomove(mtod(m, caddr_t),
1238 (int)szmin(resid, m->m_len),
1240 resid = uio->uio_resid;
1242 } while (uio->uio_resid && error == 0 && m);
1249 if ((so->so_state & SS_ISCONFIRMING) && resid)
1253 * The token interlocks against the protocol thread while
1254 * ssb_lock is a blocking lock against other userland entities.
1256 lwkt_gettoken(&so->so_rcv.ssb_token);
1258 error = ssb_lock(&so->so_rcv, SBLOCKWAIT(flags));
1262 m = so->so_rcv.ssb_mb;
1264 * If we have less data than requested, block awaiting more
1265 * (subject to any timeout) if:
1266 * 1. the current count is less than the low water mark, or
1267 * 2. MSG_WAITALL is set, and it is possible to do the entire
1268 * receive operation at once if we block (resid <= hiwat).
1269 * 3. MSG_DONTWAIT is not set
1270 * If MSG_WAITALL is set but resid is larger than the receive buffer,
1271 * we have to do the receive in sections, and thus risk returning
1272 * a short count if a timeout or signal occurs after we start.
1274 if (m == NULL || (((flags & MSG_DONTWAIT) == 0 &&
1275 (size_t)so->so_rcv.ssb_cc < resid) &&
1276 (so->so_rcv.ssb_cc < so->so_rcv.ssb_lowat ||
1277 ((flags & MSG_WAITALL) && resid <= (size_t)so->so_rcv.ssb_hiwat)) &&
1278 m->m_nextpkt == 0 && (pr->pr_flags & PR_ATOMIC) == 0)) {
1279 KASSERT(m != NULL || !so->so_rcv.ssb_cc, ("receive 1"));
1283 error = so->so_error;
1284 if ((flags & MSG_PEEK) == 0)
1288 if (so->so_state & SS_CANTRCVMORE) {
1294 for (; m; m = m->m_next) {
1295 if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
1296 m = so->so_rcv.ssb_mb;
1300 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
1301 (pr->pr_flags & PR_CONNREQUIRED)) {
1307 if (flags & (MSG_FNONBLOCKING|MSG_DONTWAIT)) {
1308 error = EWOULDBLOCK;
1311 ssb_unlock(&so->so_rcv);
1312 error = ssb_wait(&so->so_rcv);
1318 if (uio && uio->uio_td && uio->uio_td->td_proc)
1319 uio->uio_td->td_lwp->lwp_ru.ru_msgrcv++;
1322 * note: m should be == sb_mb here. Cache the next record while
1323 * cleaning up. Note that calling m_free*() will break out critical
1326 KKASSERT(m == so->so_rcv.ssb_mb);
1329 * Skip any address mbufs prepending the record.
1331 if (pr->pr_flags & PR_ADDR) {
1332 KASSERT(m->m_type == MT_SONAME, ("receive 1a"));
1335 *psa = dup_sockaddr(mtod(m, struct sockaddr *));
1336 if (flags & MSG_PEEK)
1339 m = sbunlinkmbuf(&so->so_rcv.sb, m, &free_chain);
1343 * Skip any control mbufs prepending the record.
1346 if (pr->pr_flags & PR_ADDR_OPT) {
1348 * For SCTP we may be getting a
1349 * whole message OR a partial delivery.
1351 if (m && m->m_type == MT_SONAME) {
1354 *psa = dup_sockaddr(mtod(m, struct sockaddr *));
1355 if (flags & MSG_PEEK)
1358 m = sbunlinkmbuf(&so->so_rcv.sb, m, &free_chain);
1362 while (m && m->m_type == MT_CONTROL && error == 0) {
1363 if (flags & MSG_PEEK) {
1365 *controlp = m_copy(m, 0, m->m_len);
1366 m = m->m_next; /* XXX race */
1369 n = sbunlinkmbuf(&so->so_rcv.sb, m, NULL);
1370 if (pr->pr_domain->dom_externalize &&
1371 mtod(m, struct cmsghdr *)->cmsg_type ==
1373 error = (*pr->pr_domain->dom_externalize)(m);
1377 m = sbunlinkmbuf(&so->so_rcv.sb, m, &free_chain);
1380 if (controlp && *controlp) {
1382 controlp = &(*controlp)->m_next;
1391 if (type == MT_OOBDATA)
1396 * Copy to the UIO or mbuf return chain (*mp).
1400 while (m && resid > 0 && error == 0) {
1401 if (m->m_type == MT_OOBDATA) {
1402 if (type != MT_OOBDATA)
1404 } else if (type == MT_OOBDATA)
1407 KASSERT(m->m_type == MT_DATA || m->m_type == MT_HEADER,
1409 soclrstate(so, SS_RCVATMARK);
1410 len = (resid > INT_MAX) ? INT_MAX : resid;
1411 if (so->so_oobmark && len > so->so_oobmark - offset)
1412 len = so->so_oobmark - offset;
1413 if (len > m->m_len - moff)
1414 len = m->m_len - moff;
1417 * Copy out to the UIO or pass the mbufs back to the SIO.
1418 * The SIO is dealt with when we eat the mbuf, but deal
1419 * with the resid here either way.
1422 uio->uio_resid = resid;
1423 error = uiomove(mtod(m, caddr_t) + moff, len, uio);
1424 resid = uio->uio_resid;
1428 resid -= (size_t)len;
1432 * Eat the entire mbuf or just a piece of it
1434 if (len == m->m_len - moff) {
1435 if (m->m_flags & M_EOR)
1438 if (m->m_flags & M_NOTIFICATION)
1439 flags |= MSG_NOTIFICATION;
1441 if (flags & MSG_PEEK) {
1446 n = sbunlinkmbuf(&so->so_rcv.sb, m, NULL);
1450 m = sbunlinkmbuf(&so->so_rcv.sb, m, &free_chain);
1454 if (flags & MSG_PEEK) {
1458 n = m_copym(m, 0, len, MB_WAIT);
1464 so->so_rcv.ssb_cc -= len;
1467 if (so->so_oobmark) {
1468 if ((flags & MSG_PEEK) == 0) {
1469 so->so_oobmark -= len;
1470 if (so->so_oobmark == 0) {
1471 sosetstate(so, SS_RCVATMARK);
1476 if (offset == so->so_oobmark)
1480 if (flags & MSG_EOR)
1483 * If the MSG_WAITALL flag is set (for non-atomic socket),
1484 * we must not quit until resid == 0 or an error
1485 * termination. If a signal/timeout occurs, return
1486 * with a short count but without error.
1487 * Keep signalsockbuf locked against other readers.
1489 while ((flags & MSG_WAITALL) && m == NULL &&
1490 resid > 0 && !sosendallatonce(so) &&
1491 so->so_rcv.ssb_mb == NULL) {
1492 if (so->so_error || so->so_state & SS_CANTRCVMORE)
1495 * The window might have closed to zero, make
1496 * sure we send an ack now that we've drained
1497 * the buffer or we might end up blocking until
1498 * the idle takes over (5 seconds).
1500 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1501 so_pru_rcvd(so, flags);
1502 error = ssb_wait(&so->so_rcv);
1504 ssb_unlock(&so->so_rcv);
1508 m = so->so_rcv.ssb_mb;
1513 * If an atomic read was requested but unread data still remains
1514 * in the record, set MSG_TRUNC.
1516 if (m && pr->pr_flags & PR_ATOMIC)
1520 * Cleanup. If an atomic read was requested drop any unread data.
1522 if ((flags & MSG_PEEK) == 0) {
1523 if (m && (pr->pr_flags & PR_ATOMIC))
1524 sbdroprecord(&so->so_rcv.sb);
1525 if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
1526 so_pru_rcvd(so, flags);
1529 if (orig_resid == resid && orig_resid &&
1530 (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
1531 ssb_unlock(&so->so_rcv);
1538 ssb_unlock(&so->so_rcv);
1540 lwkt_reltoken(&so->so_rcv.ssb_token);
1542 m_freem(free_chain);
1547 sorecvtcp(struct socket *so, struct sockaddr **psa, struct uio *uio,
1548 struct sockbuf *sio, struct mbuf **controlp, int *flagsp)
1551 struct mbuf *free_chain = NULL;
1552 int flags, len, error, offset;
1553 struct protosw *pr = so->so_proto;
1555 size_t resid, orig_resid;
1558 resid = uio->uio_resid;
1560 resid = (size_t)(sio->sb_climit - sio->sb_cc);
1568 flags = *flagsp &~ MSG_EOR;
1571 if (flags & MSG_OOB) {
1572 m = m_get(MB_WAIT, MT_DATA);
1575 error = so_pru_rcvoob(so, m, flags & MSG_PEEK);
1581 KKASSERT(resid >= (size_t)m->m_len);
1582 resid -= (size_t)m->m_len;
1583 } while (resid > 0 && m);
1586 uio->uio_resid = resid;
1587 error = uiomove(mtod(m, caddr_t),
1588 (int)szmin(resid, m->m_len),
1590 resid = uio->uio_resid;
1592 } while (uio->uio_resid && error == 0 && m);
1601 * The token interlocks against the protocol thread while
1602 * ssb_lock is a blocking lock against other userland entities.
1604 lwkt_gettoken(&so->so_rcv.ssb_token);
1606 error = ssb_lock(&so->so_rcv, SBLOCKWAIT(flags));
1610 m = so->so_rcv.ssb_mb;
1612 * If we have less data than requested, block awaiting more
1613 * (subject to any timeout) if:
1614 * 1. the current count is less than the low water mark, or
1615 * 2. MSG_WAITALL is set, and it is possible to do the entire
1616 * receive operation at once if we block (resid <= hiwat).
1617 * 3. MSG_DONTWAIT is not set
1618 * If MSG_WAITALL is set but resid is larger than the receive buffer,
1619 * we have to do the receive in sections, and thus risk returning
1620 * a short count if a timeout or signal occurs after we start.
1622 if (m == NULL || (((flags & MSG_DONTWAIT) == 0 &&
1623 (size_t)so->so_rcv.ssb_cc < resid) &&
1624 (so->so_rcv.ssb_cc < so->so_rcv.ssb_lowat ||
1625 ((flags & MSG_WAITALL) && resid <= (size_t)so->so_rcv.ssb_hiwat)))) {
1626 KASSERT(m != NULL || !so->so_rcv.ssb_cc, ("receive 1"));
1630 error = so->so_error;
1631 if ((flags & MSG_PEEK) == 0)
1635 if (so->so_state & SS_CANTRCVMORE) {
1641 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
1642 (pr->pr_flags & PR_CONNREQUIRED)) {
1648 if (flags & (MSG_FNONBLOCKING|MSG_DONTWAIT)) {
1649 error = EWOULDBLOCK;
1652 ssb_unlock(&so->so_rcv);
1653 error = ssb_wait(&so->so_rcv);
1659 if (uio && uio->uio_td && uio->uio_td->td_proc)
1660 uio->uio_td->td_lwp->lwp_ru.ru_msgrcv++;
1663 * note: m should be == sb_mb here. Cache the next record while
1664 * cleaning up. Note that calling m_free*() will break out critical
1667 KKASSERT(m == so->so_rcv.ssb_mb);
1670 * Copy to the UIO or mbuf return chain (*mp).
1674 while (m && resid > 0 && error == 0) {
1675 KASSERT(m->m_type == MT_DATA || m->m_type == MT_HEADER,
1678 soclrstate(so, SS_RCVATMARK);
1679 len = (resid > INT_MAX) ? INT_MAX : resid;
1680 if (so->so_oobmark && len > so->so_oobmark - offset)
1681 len = so->so_oobmark - offset;
1682 if (len > m->m_len - moff)
1683 len = m->m_len - moff;
1686 * Copy out to the UIO or pass the mbufs back to the SIO.
1687 * The SIO is dealt with when we eat the mbuf, but deal
1688 * with the resid here either way.
1691 uio->uio_resid = resid;
1692 error = uiomove(mtod(m, caddr_t) + moff, len, uio);
1693 resid = uio->uio_resid;
1697 resid -= (size_t)len;
1701 * Eat the entire mbuf or just a piece of it
1703 if (len == m->m_len - moff) {
1704 if (flags & MSG_PEEK) {
1709 n = sbunlinkmbuf(&so->so_rcv.sb, m, NULL);
1713 m = sbunlinkmbuf(&so->so_rcv.sb, m, &free_chain);
1717 if (flags & MSG_PEEK) {
1721 n = m_copym(m, 0, len, MB_WAIT);
1727 so->so_rcv.ssb_cc -= len;
1730 if (so->so_oobmark) {
1731 if ((flags & MSG_PEEK) == 0) {
1732 so->so_oobmark -= len;
1733 if (so->so_oobmark == 0) {
1734 sosetstate(so, SS_RCVATMARK);
1739 if (offset == so->so_oobmark)
1744 * If the MSG_WAITALL flag is set (for non-atomic socket),
1745 * we must not quit until resid == 0 or an error
1746 * termination. If a signal/timeout occurs, return
1747 * with a short count but without error.
1748 * Keep signalsockbuf locked against other readers.
1750 while ((flags & MSG_WAITALL) && m == NULL &&
1751 resid > 0 && !sosendallatonce(so) &&
1752 so->so_rcv.ssb_mb == NULL) {
1753 if (so->so_error || so->so_state & SS_CANTRCVMORE)
1756 * The window might have closed to zero, make
1757 * sure we send an ack now that we've drained
1758 * the buffer or we might end up blocking until
1759 * the idle takes over (5 seconds).
1762 so_pru_rcvd_async(so);
1763 error = ssb_wait(&so->so_rcv);
1765 ssb_unlock(&so->so_rcv);
1769 m = so->so_rcv.ssb_mb;
1774 * Cleanup. If an atomic read was requested drop any unread data.
1776 if ((flags & MSG_PEEK) == 0) {
1778 so_pru_rcvd_async(so);
1781 if (orig_resid == resid && orig_resid &&
1782 (so->so_state & SS_CANTRCVMORE) == 0) {
1783 ssb_unlock(&so->so_rcv);
1790 ssb_unlock(&so->so_rcv);
1792 lwkt_reltoken(&so->so_rcv.ssb_token);
1794 m_freem(free_chain);
1799 * Shut a socket down. Note that we do not get a frontend lock as we
1800 * want to be able to shut the socket down even if another thread is
1801 * blocked in a read(), thus waking it up.
1804 soshutdown(struct socket *so, int how)
1806 if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
1809 if (how != SHUT_WR) {
1810 /*ssb_lock(&so->so_rcv, M_WAITOK);*/
1812 /*ssb_unlock(&so->so_rcv);*/
1815 return (so_pru_shutdown(so));
1820 sorflush(struct socket *so)
1822 struct signalsockbuf *ssb = &so->so_rcv;
1823 struct protosw *pr = so->so_proto;
1824 struct signalsockbuf asb;
1826 atomic_set_int(&ssb->ssb_flags, SSB_NOINTR);
1828 lwkt_gettoken(&ssb->ssb_token);
1833 * Can't just blow up the ssb structure here
1835 bzero(&ssb->sb, sizeof(ssb->sb));
1840 atomic_clear_int(&ssb->ssb_flags, SSB_CLEAR_MASK);
1842 if ((pr->pr_flags & PR_RIGHTS) && pr->pr_domain->dom_dispose)
1843 (*pr->pr_domain->dom_dispose)(asb.ssb_mb);
1844 ssb_release(&asb, so);
1846 lwkt_reltoken(&ssb->ssb_token);
1851 do_setopt_accept_filter(struct socket *so, struct sockopt *sopt)
1853 struct accept_filter_arg *afap = NULL;
1854 struct accept_filter *afp;
1855 struct so_accf *af = so->so_accf;
1858 /* do not set/remove accept filters on non listen sockets */
1859 if ((so->so_options & SO_ACCEPTCONN) == 0) {
1864 /* removing the filter */
1867 if (af->so_accept_filter != NULL &&
1868 af->so_accept_filter->accf_destroy != NULL) {
1869 af->so_accept_filter->accf_destroy(so);
1871 if (af->so_accept_filter_str != NULL) {
1872 kfree(af->so_accept_filter_str, M_ACCF);
1877 so->so_options &= ~SO_ACCEPTFILTER;
1880 /* adding a filter */
1881 /* must remove previous filter first */
1886 /* don't put large objects on the kernel stack */
1887 afap = kmalloc(sizeof(*afap), M_TEMP, M_WAITOK);
1888 error = sooptcopyin(sopt, afap, sizeof *afap, sizeof *afap);
1889 afap->af_name[sizeof(afap->af_name)-1] = '\0';
1890 afap->af_arg[sizeof(afap->af_arg)-1] = '\0';
1893 afp = accept_filt_get(afap->af_name);
1898 af = kmalloc(sizeof(*af), M_ACCF, M_WAITOK | M_ZERO);
1899 if (afp->accf_create != NULL) {
1900 if (afap->af_name[0] != '\0') {
1901 int len = strlen(afap->af_name) + 1;
1903 af->so_accept_filter_str = kmalloc(len, M_ACCF,
1905 strcpy(af->so_accept_filter_str, afap->af_name);
1907 af->so_accept_filter_arg = afp->accf_create(so, afap->af_arg);
1908 if (af->so_accept_filter_arg == NULL) {
1909 kfree(af->so_accept_filter_str, M_ACCF);
1916 af->so_accept_filter = afp;
1918 so->so_options |= SO_ACCEPTFILTER;
1921 kfree(afap, M_TEMP);
1927 * Perhaps this routine, and sooptcopyout(), below, ought to come in
1928 * an additional variant to handle the case where the option value needs
1929 * to be some kind of integer, but not a specific size.
1930 * In addition to their use here, these functions are also called by the
1931 * protocol-level pr_ctloutput() routines.
1934 sooptcopyin(struct sockopt *sopt, void *buf, size_t len, size_t minlen)
1936 return soopt_to_kbuf(sopt, buf, len, minlen);
1940 soopt_to_kbuf(struct sockopt *sopt, void *buf, size_t len, size_t minlen)
1944 KKASSERT(!sopt->sopt_val || kva_p(sopt->sopt_val));
1945 KKASSERT(kva_p(buf));
1948 * If the user gives us more than we wanted, we ignore it,
1949 * but if we don't get the minimum length the caller
1950 * wants, we return EINVAL. On success, sopt->sopt_valsize
1951 * is set to however much we actually retrieved.
1953 if ((valsize = sopt->sopt_valsize) < minlen)
1956 sopt->sopt_valsize = valsize = len;
1958 bcopy(sopt->sopt_val, buf, valsize);
1964 sosetopt(struct socket *so, struct sockopt *sopt)
1970 struct signalsockbuf *sotmp;
1973 sopt->sopt_dir = SOPT_SET;
1974 if (sopt->sopt_level != SOL_SOCKET) {
1975 if (so->so_proto && so->so_proto->pr_ctloutput) {
1976 return (so_pr_ctloutput(so, sopt));
1978 error = ENOPROTOOPT;
1980 switch (sopt->sopt_name) {
1982 case SO_ACCEPTFILTER:
1983 error = do_setopt_accept_filter(so, sopt);
1989 error = sooptcopyin(sopt, &l, sizeof l, sizeof l);
1993 so->so_linger = l.l_linger;
1995 so->so_options |= SO_LINGER;
1997 so->so_options &= ~SO_LINGER;
2003 case SO_USELOOPBACK:
2010 error = sooptcopyin(sopt, &optval, sizeof optval,
2015 so->so_options |= sopt->sopt_name;
2017 so->so_options &= ~sopt->sopt_name;
2024 error = sooptcopyin(sopt, &optval, sizeof optval,
2030 * Values < 1 make no sense for any of these
2031 * options, so disallow them.
2038 switch (sopt->sopt_name) {
2041 if (ssb_reserve(sopt->sopt_name == SO_SNDBUF ?
2042 &so->so_snd : &so->so_rcv, (u_long)optval,
2044 &curproc->p_rlimit[RLIMIT_SBSIZE]) == 0) {
2048 sotmp = (sopt->sopt_name == SO_SNDBUF) ?
2049 &so->so_snd : &so->so_rcv;
2050 atomic_clear_int(&sotmp->ssb_flags,
2055 * Make sure the low-water is never greater than
2059 so->so_snd.ssb_lowat =
2060 (optval > so->so_snd.ssb_hiwat) ?
2061 so->so_snd.ssb_hiwat : optval;
2062 atomic_clear_int(&so->so_snd.ssb_flags,
2066 so->so_rcv.ssb_lowat =
2067 (optval > so->so_rcv.ssb_hiwat) ?
2068 so->so_rcv.ssb_hiwat : optval;
2069 atomic_clear_int(&so->so_rcv.ssb_flags,
2077 error = sooptcopyin(sopt, &tv, sizeof tv,
2082 /* assert(hz > 0); */
2083 if (tv.tv_sec < 0 || tv.tv_sec > INT_MAX / hz ||
2084 tv.tv_usec < 0 || tv.tv_usec >= 1000000) {
2088 /* assert(tick > 0); */
2089 /* assert(ULONG_MAX - INT_MAX >= 1000000); */
2090 val = (u_long)(tv.tv_sec * hz) + tv.tv_usec / ustick;
2091 if (val > INT_MAX) {
2095 if (val == 0 && tv.tv_usec != 0)
2098 switch (sopt->sopt_name) {
2100 so->so_snd.ssb_timeo = val;
2103 so->so_rcv.ssb_timeo = val;
2108 error = ENOPROTOOPT;
2111 if (error == 0 && so->so_proto && so->so_proto->pr_ctloutput) {
2112 (void) so_pr_ctloutput(so, sopt);
2119 /* Helper routine for getsockopt */
2121 sooptcopyout(struct sockopt *sopt, const void *buf, size_t len)
2123 soopt_from_kbuf(sopt, buf, len);
2128 soopt_from_kbuf(struct sockopt *sopt, const void *buf, size_t len)
2133 sopt->sopt_valsize = 0;
2137 KKASSERT(!sopt->sopt_val || kva_p(sopt->sopt_val));
2138 KKASSERT(kva_p(buf));
2141 * Documented get behavior is that we always return a value,
2142 * possibly truncated to fit in the user's buffer.
2143 * Traditional behavior is that we always tell the user
2144 * precisely how much we copied, rather than something useful
2145 * like the total amount we had available for her.
2146 * Note that this interface is not idempotent; the entire answer must
2147 * generated ahead of time.
2149 valsize = szmin(len, sopt->sopt_valsize);
2150 sopt->sopt_valsize = valsize;
2151 if (sopt->sopt_val != 0) {
2152 bcopy(buf, sopt->sopt_val, valsize);
2157 sogetopt(struct socket *so, struct sockopt *sopt)
2164 struct accept_filter_arg *afap;
2168 sopt->sopt_dir = SOPT_GET;
2169 if (sopt->sopt_level != SOL_SOCKET) {
2170 if (so->so_proto && so->so_proto->pr_ctloutput) {
2171 return (so_pr_ctloutput(so, sopt));
2173 return (ENOPROTOOPT);
2175 switch (sopt->sopt_name) {
2177 case SO_ACCEPTFILTER:
2178 if ((so->so_options & SO_ACCEPTCONN) == 0)
2180 afap = kmalloc(sizeof(*afap), M_TEMP,
2182 if ((so->so_options & SO_ACCEPTFILTER) != 0) {
2183 strcpy(afap->af_name, so->so_accf->so_accept_filter->accf_name);
2184 if (so->so_accf->so_accept_filter_str != NULL)
2185 strcpy(afap->af_arg, so->so_accf->so_accept_filter_str);
2187 error = sooptcopyout(sopt, afap, sizeof(*afap));
2188 kfree(afap, M_TEMP);
2193 l.l_onoff = so->so_options & SO_LINGER;
2194 l.l_linger = so->so_linger;
2195 error = sooptcopyout(sopt, &l, sizeof l);
2198 case SO_USELOOPBACK:
2208 optval = so->so_options & sopt->sopt_name;
2210 error = sooptcopyout(sopt, &optval, sizeof optval);
2214 optval = so->so_type;
2218 optval = so->so_error;
2223 optval = so->so_snd.ssb_hiwat;
2227 optval = so->so_rcv.ssb_hiwat;
2231 optval = so->so_snd.ssb_lowat;
2235 optval = so->so_rcv.ssb_lowat;
2240 optval = (sopt->sopt_name == SO_SNDTIMEO ?
2241 so->so_snd.ssb_timeo : so->so_rcv.ssb_timeo);
2243 tv.tv_sec = optval / hz;
2244 tv.tv_usec = (optval % hz) * ustick;
2245 error = sooptcopyout(sopt, &tv, sizeof tv);
2249 optval_l = ssb_space(&so->so_snd);
2250 error = sooptcopyout(sopt, &optval_l, sizeof(optval_l));
2254 error = ENOPROTOOPT;
2261 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */
2263 soopt_getm(struct sockopt *sopt, struct mbuf **mp)
2265 struct mbuf *m, *m_prev;
2266 int sopt_size = sopt->sopt_valsize, msize;
2268 m = m_getl(sopt_size, sopt->sopt_td ? MB_WAIT : MB_DONTWAIT, MT_DATA,
2272 m->m_len = min(msize, sopt_size);
2273 sopt_size -= m->m_len;
2277 while (sopt_size > 0) {
2278 m = m_getl(sopt_size, sopt->sopt_td ? MB_WAIT : MB_DONTWAIT,
2279 MT_DATA, 0, &msize);
2284 m->m_len = min(msize, sopt_size);
2285 sopt_size -= m->m_len;
2292 /* XXX; copyin sopt data into mbuf chain for (__FreeBSD__ < 3) routines. */
2294 soopt_mcopyin(struct sockopt *sopt, struct mbuf *m)
2296 soopt_to_mbuf(sopt, m);
2301 soopt_to_mbuf(struct sockopt *sopt, struct mbuf *m)
2306 KKASSERT(!sopt->sopt_val || kva_p(sopt->sopt_val));
2308 if (sopt->sopt_val == NULL)
2310 val = sopt->sopt_val;
2311 valsize = sopt->sopt_valsize;
2312 while (m != NULL && valsize >= m->m_len) {
2313 bcopy(val, mtod(m, char *), m->m_len);
2314 valsize -= m->m_len;
2315 val = (caddr_t)val + m->m_len;
2318 if (m != NULL) /* should be allocated enoughly at ip6_sooptmcopyin() */
2319 panic("ip6_sooptmcopyin");
2322 /* XXX; copyout mbuf chain data into soopt for (__FreeBSD__ < 3) routines. */
2324 soopt_mcopyout(struct sockopt *sopt, struct mbuf *m)
2326 return soopt_from_mbuf(sopt, m);
2330 soopt_from_mbuf(struct sockopt *sopt, struct mbuf *m)
2332 struct mbuf *m0 = m;
2337 KKASSERT(!sopt->sopt_val || kva_p(sopt->sopt_val));
2339 if (sopt->sopt_val == NULL)
2341 val = sopt->sopt_val;
2342 maxsize = sopt->sopt_valsize;
2343 while (m != NULL && maxsize >= m->m_len) {
2344 bcopy(mtod(m, char *), val, m->m_len);
2345 maxsize -= m->m_len;
2346 val = (caddr_t)val + m->m_len;
2347 valsize += m->m_len;
2351 /* enough soopt buffer should be given from user-land */
2355 sopt->sopt_valsize = valsize;
2360 sohasoutofband(struct socket *so)
2362 if (so->so_sigio != NULL)
2363 pgsigio(so->so_sigio, SIGURG, 0);
2364 KNOTE(&so->so_rcv.ssb_kq.ki_note, NOTE_OOB);
2368 sokqfilter(struct file *fp, struct knote *kn)
2370 struct socket *so = (struct socket *)kn->kn_fp->f_data;
2371 struct signalsockbuf *ssb;
2373 switch (kn->kn_filter) {
2375 if (so->so_options & SO_ACCEPTCONN)
2376 kn->kn_fop = &solisten_filtops;
2378 kn->kn_fop = &soread_filtops;
2382 kn->kn_fop = &sowrite_filtops;
2386 kn->kn_fop = &soexcept_filtops;
2390 return (EOPNOTSUPP);
2393 knote_insert(&ssb->ssb_kq.ki_note, kn);
2394 atomic_set_int(&ssb->ssb_flags, SSB_KNOTE);
2399 filt_sordetach(struct knote *kn)
2401 struct socket *so = (struct socket *)kn->kn_fp->f_data;
2403 knote_remove(&so->so_rcv.ssb_kq.ki_note, kn);
2404 if (SLIST_EMPTY(&so->so_rcv.ssb_kq.ki_note))
2405 atomic_clear_int(&so->so_rcv.ssb_flags, SSB_KNOTE);
2410 filt_soread(struct knote *kn, long hint)
2412 struct socket *so = (struct socket *)kn->kn_fp->f_data;
2414 if (kn->kn_sfflags & NOTE_OOB) {
2415 if ((so->so_oobmark || (so->so_state & SS_RCVATMARK))) {
2416 kn->kn_fflags |= NOTE_OOB;
2421 kn->kn_data = so->so_rcv.ssb_cc;
2423 if (so->so_state & SS_CANTRCVMORE) {
2425 * Only set NODATA if all data has been exhausted.
2427 if (kn->kn_data == 0)
2428 kn->kn_flags |= EV_NODATA;
2429 kn->kn_flags |= EV_EOF;
2430 kn->kn_fflags = so->so_error;
2433 if (so->so_error) /* temporary udp error */
2435 if (kn->kn_sfflags & NOTE_LOWAT)
2436 return (kn->kn_data >= kn->kn_sdata);
2437 return ((kn->kn_data >= so->so_rcv.ssb_lowat) ||
2438 !TAILQ_EMPTY(&so->so_comp));
2442 filt_sowdetach(struct knote *kn)
2444 struct socket *so = (struct socket *)kn->kn_fp->f_data;
2446 knote_remove(&so->so_snd.ssb_kq.ki_note, kn);
2447 if (SLIST_EMPTY(&so->so_snd.ssb_kq.ki_note))
2448 atomic_clear_int(&so->so_snd.ssb_flags, SSB_KNOTE);
2453 filt_sowrite(struct knote *kn, long hint)
2455 struct socket *so = (struct socket *)kn->kn_fp->f_data;
2457 kn->kn_data = ssb_space(&so->so_snd);
2458 if (so->so_state & SS_CANTSENDMORE) {
2459 kn->kn_flags |= (EV_EOF | EV_NODATA);
2460 kn->kn_fflags = so->so_error;
2463 if (so->so_error) /* temporary udp error */
2465 if (((so->so_state & SS_ISCONNECTED) == 0) &&
2466 (so->so_proto->pr_flags & PR_CONNREQUIRED))
2468 if (kn->kn_sfflags & NOTE_LOWAT)
2469 return (kn->kn_data >= kn->kn_sdata);
2470 return (kn->kn_data >= so->so_snd.ssb_lowat);
2475 filt_solisten(struct knote *kn, long hint)
2477 struct socket *so = (struct socket *)kn->kn_fp->f_data;
2479 kn->kn_data = so->so_qlen;
2480 return (! TAILQ_EMPTY(&so->so_comp));