tcp_usrreq.c source code [xnu/bsd/netinet/tcp_usrreq.c]

1	/*
2	* Copyright (c) 2000-2017 Apple Inc. All rights reserved.
3	*
4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5	*
6	* This file contains Original Code and/or Modifications of Original Code
7	* as defined in and that are subject to the Apple Public Source License
8	* Version 2.0 (the 'License'). You may not use this file except in
9	* compliance with the License. The rights granted to you under the License
10	* may not be used to create, or enable the creation or redistribution of,
11	* unlawful or unlicensed copies of an Apple operating system, or to
12	* circumvent, violate, or enable the circumvention or violation of, any
13	* terms of an Apple operating system software license agreement.
14	*
15	* Please obtain a copy of the License at
16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
17	*
18	* The Original Code and all software distributed under the License are
19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23	* Please see the License for the specific language governing rights and
24	* limitations under the License.
25	*
26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27	*/
28	/*
29	* Copyright (c) 1982, 1986, 1988, 1993
30	* The Regents of the University of California. All rights reserved.
31	*
32	* Redistribution and use in source and binary forms, with or without
33	* modification, are permitted provided that the following conditions
34	* are met:
35	* 1. Redistributions of source code must retain the above copyright
36	* notice, this list of conditions and the following disclaimer.
37	* 2. Redistributions in binary form must reproduce the above copyright
38	* notice, this list of conditions and the following disclaimer in the
39	* documentation and/or other materials provided with the distribution.
40	* 3. All advertising materials mentioning features or use of this software
41	* must display the following acknowledgement:
42	* This product includes software developed by the University of
43	* California, Berkeley and its contributors.
44	* 4. Neither the name of the University nor the names of its contributors
45	* may be used to endorse or promote products derived from this software
46	* without specific prior written permission.
47	*
48	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58	* SUCH DAMAGE.
59	*
60	* From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94
61	* $FreeBSD: src/sys/netinet/tcp_usrreq.c,v 1.51.2.9 2001/08/22 00:59:12 silby Exp $
62	*/
63
64
65	#include <sys/param.h>
66	#include <sys/systm.h>
67	#include <sys/kernel.h>
68	#include <sys/sysctl.h>
69	#include <sys/mbuf.h>
70	#if INET6
71	#include <sys/domain.h>
72	#endif /* INET6 */
73	#if !CONFIG_EMBEDDED
74	#include <sys/kasl.h>
75	#endif
76	#include <sys/socket.h>
77	#include <sys/socketvar.h>
78	#include <sys/protosw.h>
79	#include <sys/syslog.h>
80
81	#include <net/if.h>
82	#include <net/route.h>
83	#include <net/ntstat.h>
84	#include <net/content_filter.h>
85
86	#include <netinet/in.h>
87	#include <netinet/in_systm.h>
88	#if INET6
89	#include <netinet/ip6.h>
90	#endif
91	#include <netinet/in_pcb.h>
92	#if INET6
93	#include <netinet6/in6_pcb.h>
94	#endif
95	#include <netinet/in_var.h>
96	#include <netinet/ip_var.h>
97	#if INET6
98	#include <netinet6/ip6_var.h>
99	#endif
100	#include <netinet/tcp.h>
101	#include <netinet/tcp_fsm.h>
102	#include <netinet/tcp_seq.h>
103	#include <netinet/tcp_timer.h>
104	#include <netinet/tcp_var.h>
105	#include <netinet/tcpip.h>
106	#include <netinet/tcp_cc.h>
107	#include <mach/sdt.h>
108	#if TCPDEBUG
109	#include <netinet/tcp_debug.h>
110	#endif
111	#if MPTCP
112	#include <netinet/mptcp_var.h>
113	#endif /* MPTCP */
114
115	#if IPSEC
116	#include <netinet6/ipsec.h>
117	#endif /IPSEC/
118
119	#if FLOW_DIVERT
120	#include <netinet/flow_divert.h>
121	#endif /* FLOW_DIVERT */
122
123	errno_t tcp_fill_info_for_info_tuple(struct info_tuple , struct* tcp_info *);
124
125	int tcp_sysctl_info(struct sysctl_oid , void* , int* , struct sysctl_req *);
126	static void tcp_connection_fill_info(struct tcpcb *tp,
127	struct tcp_connection_info *tci);
128
129	/*
130	* TCP protocol interface to socket abstraction.
131	*/
132	extern char tcpstates[]; /* XXX ??? /
133
134	static int tcp_attach(struct socket , struct* proc *);
135	static int tcp_connect(struct tcpcb , struct* sockaddr , struct* proc *);
136	#if INET6
137	static int tcp6_connect(struct tcpcb , struct* sockaddr , struct* proc *);
138	static int tcp6_usr_connect(struct socket , struct* sockaddr *,
139	struct proc *);
140	#endif /* INET6 */
141	static struct tcpcb tcp_disconnect(struct* tcpcb *);
142	static struct tcpcb tcp_usrclosed(struct* tcpcb *);
143	extern void tcp_sbrcv_trim(struct tcpcb tp, struct* sockbuf *sb);
144
145	#if TCPDEBUG
146	#define TCPDEBUG0 int ostate = 0
147	#define TCPDEBUG1() ostate = tp ? tp->t_state : 0
148	#define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \
149	tcp_trace(TA_USER, ostate, tp, 0, 0, req)
150	#else
151	#define TCPDEBUG0
152	#define TCPDEBUG1()
153	#define TCPDEBUG2(req)
154	#endif
155
156	SYSCTL_PROC(_net_inet_tcp, OID_AUTO, info,
157	CTLFLAG_RW \| CTLFLAG_LOCKED \| CTLFLAG_ANYBODY \| CTLFLAG_KERN,
158	`0` , `0`, tcp_sysctl_info, "S", "TCP info per tuple");
159
160	/*
161	* TCP attaches to socket via pru_attach(), reserving space,
162	* and an internet control block.
163	*
164	* Returns: 0 Success
165	* EISCONN
166	* tcp_attach:ENOBUFS
167	* tcp_attach:ENOMEM
168	* tcp_attach:??? [IPSEC specific]
169	*/
170	static int
171	tcp_usr_attach(struct socket so, __unused int* proto, struct proc *p)
172	{
173	int error;
174	struct inpcb *inp = sotoinpcb(so);
175	struct tcpcb *tp = `0`;
176	TCPDEBUG0;
177
178	TCPDEBUG1();
179	if (inp) {
180	error = EISCONN;
181	goto out;
182	}
183
184	error = tcp_attach(so, p);
185	if (error)
186	goto out;
187
188	if ((so->so_options & SO_LINGER) && so->so_linger == `0`)
189	so->so_linger = TCP_LINGERTIME * hz;
190	tp = sototcpcb(so);
191	out:
192	TCPDEBUG2(PRU_ATTACH);
193	return error;
194	}
195
196	/*
197	* pru_detach() detaches the TCP protocol from the socket.
198	* If the protocol state is non-embryonic, then can't
199	* do this directly: have to initiate a pru_disconnect(),
200	* which may finish later; embryonic TCB's can just
201	* be discarded here.
202	*/
203	static int
204	tcp_usr_detach(struct socket *so)
205	{
206	int error = `0`;
207	struct inpcb *inp = sotoinpcb(so);
208	struct tcpcb *tp;
209	TCPDEBUG0;
210
211	if (inp == `0` \|\| (inp->inp_state == INPCB_STATE_DEAD)) {
212	return EINVAL; / XXX /
213	}
214	socket_lock_assert_owned(so);
215	tp = intotcpcb(inp);
216	/ In case we got disconnected from the peer /
217	if (tp == NULL)
218	goto out;
219	TCPDEBUG1();
220
221	calculate_tcp_clock();
222
223	tp = tcp_disconnect(tp);
224	out:
225	TCPDEBUG2(PRU_DETACH);
226	return error;
227	}
228
229	#if NECP
230	#define COMMON_START() TCPDEBUG0; \
231	do { \
232	if (inp == NULL \|\| inp->inp_state == INPCB_STATE_DEAD) \
233	return (EINVAL); \
234	if (necp_socket_should_use_flow_divert(inp)) \
235	return (EPROTOTYPE); \
236	tp = intotcpcb(inp); \
237	TCPDEBUG1(); \
238	calculate_tcp_clock(); \
239	} while (0)
240	#else /* NECP */
241	#define COMMON_START() TCPDEBUG0; \
242	do { \
243	if (inp == NULL \|\| inp->inp_state == INPCB_STATE_DEAD) \
244	return (EINVAL); \
245	tp = intotcpcb(inp); \
246	TCPDEBUG1(); \
247	calculate_tcp_clock(); \
248	} while (0)
249	#endif /* !NECP */
250
251	#define COMMON_END(req) out: TCPDEBUG2(req); return error; goto out
252
253
254	/*
255	* Give the socket an address.
256	*
257	* Returns: 0 Success
258	* EINVAL Invalid argument [COMMON_START]
259	* EAFNOSUPPORT Address family not supported
260	* in_pcbbind:EADDRNOTAVAIL Address not available.
261	* in_pcbbind:EINVAL Invalid argument
262	* in_pcbbind:EAFNOSUPPORT Address family not supported [notdef]
263	* in_pcbbind:EACCES Permission denied
264	* in_pcbbind:EADDRINUSE Address in use
265	* in_pcbbind:EAGAIN Resource unavailable, try again
266	* in_pcbbind:EPERM Operation not permitted
267	*/
268	static int
269	tcp_usr_bind(struct socket so, struct* sockaddr nam, struct* proc *p)
270	{
271	int error = `0`;
272	struct inpcb *inp = sotoinpcb(so);
273	struct tcpcb *tp;
274	struct sockaddr_in *sinp;
275
276	COMMON_START();
277
278	if (nam->sa_family != `0` && nam->sa_family != AF_INET) {
279	error = EAFNOSUPPORT;
280	goto out;
281	}
282
283	/*
284	* Must check for multicast addresses and disallow binding
285	* to them.
286	*/
287	sinp = (struct sockaddr_in )(void* *)nam;
288	if (sinp->sin_family == AF_INET &&
289	IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
290	error = EAFNOSUPPORT;
291	goto out;
292	}
293	error = in_pcbbind(inp, nam, p);
294	if (error)
295	goto out;
296
297	#if NECP
298	/ Update NECP client with bind result if not in middle of connect /
299	if ((inp->inp_flags2 & INP2_CONNECT_IN_PROGRESS) &&
300	!uuid_is_null(inp->necp_client_uuid)) {
301	socket_unlock(so, `0`);
302	necp_client_assign_from_socket(so->last_pid, inp->necp_client_uuid, inp);
303	socket_lock(so, `0`);
304	}
305	#endif /* NECP */
306
307	COMMON_END(PRU_BIND);
308
309	}
310
311	#if INET6
312	static int
313	tcp6_usr_bind(struct socket so, struct* sockaddr nam, struct* proc *p)
314	{
315	int error = `0`;
316	struct inpcb *inp = sotoinpcb(so);
317	struct tcpcb *tp;
318	struct sockaddr_in6 *sin6p;
319
320	COMMON_START();
321
322	if (nam->sa_family != `0` && nam->sa_family != AF_INET6) {
323	error = EAFNOSUPPORT;
324	goto out;
325	}
326
327	/*
328	* Must check for multicast addresses and disallow binding
329	* to them.
330	*/
331	sin6p = (struct sockaddr_in6 )(void* *)nam;
332	if (sin6p->sin6_family == AF_INET6 &&
333	IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
334	error = EAFNOSUPPORT;
335	goto out;
336	}
337	inp->inp_vflag &= ~INP_IPV4;
338	inp->inp_vflag \|= INP_IPV6;
339	if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == `0`) {
340	if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
341	inp->inp_vflag \|= INP_IPV4;
342	else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
343	struct sockaddr_in sin;
344
345	in6_sin6_2_sin(&sin, sin6p);
346	inp->inp_vflag \|= INP_IPV4;
347	inp->inp_vflag &= ~INP_IPV6;
348	error = in_pcbbind(inp, (struct sockaddr *)&sin, p);
349	goto out;
350	}
351	}
352	error = in6_pcbbind(inp, nam, p);
353	if (error)
354	goto out;
355	COMMON_END(PRU_BIND);
356	}
357	#endif /* INET6 */
358
359	/*
360	* Prepare to accept connections.
361	*
362	* Returns: 0 Success
363	* EINVAL [COMMON_START]
364	* in_pcbbind:EADDRNOTAVAIL Address not available.
365	* in_pcbbind:EINVAL Invalid argument
366	* in_pcbbind:EAFNOSUPPORT Address family not supported [notdef]
367	* in_pcbbind:EACCES Permission denied
368	* in_pcbbind:EADDRINUSE Address in use
369	* in_pcbbind:EAGAIN Resource unavailable, try again
370	* in_pcbbind:EPERM Operation not permitted
371	*/
372	static int
373	tcp_usr_listen(struct socket so, struct* proc *p)
374	{
375	int error = `0`;
376	struct inpcb *inp = sotoinpcb(so);
377	struct tcpcb *tp;
378
379	COMMON_START();
380	if (inp->inp_lport == `0`)
381	error = in_pcbbind(inp, NULL, p);
382	if (error == `0`)
383	tp->t_state = TCPS_LISTEN;
384	COMMON_END(PRU_LISTEN);
385	}
386
387	#if INET6
388	static int
389	tcp6_usr_listen(struct socket so, struct* proc *p)
390	{
391	int error = `0`;
392	struct inpcb *inp = sotoinpcb(so);
393	struct tcpcb *tp;
394
395	COMMON_START();
396	if (inp->inp_lport == `0`) {
397	inp->inp_vflag &= ~INP_IPV4;
398	if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == `0`)
399	inp->inp_vflag \|= INP_IPV4;
400	error = in6_pcbbind(inp, NULL, p);
401	}
402	if (error == `0`)
403	tp->t_state = TCPS_LISTEN;
404	COMMON_END(PRU_LISTEN);
405	}
406	#endif /* INET6 */
407
408	static int
409	tcp_connect_complete(struct socket *so)
410	{
411	struct tcpcb *tp = sototcpcb(so);
412	struct inpcb *inp = sotoinpcb(so);
413	int error = `0`;
414
415	/ TFO delays the tcp_output until later, when the app calls write() /
416	if (so->so_flags1 & SOF1_PRECONNECT_DATA) {
417	if (!necp_socket_is_allowed_to_send_recv(sotoinpcb(so), NULL, NULL, NULL))
418	return (EHOSTUNREACH);
419
420	/ Initialize enough state so that we can actually send data /
421	tcp_mss(tp, -`1`, IFSCOPE_NONE);
422	tp->snd_wnd = tp->t_maxseg;
423	tp->max_sndwnd = tp->snd_wnd;
424	} else {
425	error = tcp_output(tp);
426	}
427
428	#if NECP
429	/ Update NECP client with connected five-tuple /
430	if (error == `0` && !uuid_is_null(inp->necp_client_uuid)) {
431	socket_unlock(so, `0`);
432	necp_client_assign_from_socket(so->last_pid, inp->necp_client_uuid, inp);
433	socket_lock(so, `0`);
434	}
435	#endif /* NECP */
436
437	return (error);
438	}
439
440	/*
441	* Initiate connection to peer.
442	* Create a template for use in transmissions on this connection.
443	* Enter SYN_SENT state, and mark socket as connecting.
444	* Start keep-alive timer, and seed output sequence space.
445	* Send initial segment on connection.
446	*/
447	static int
448	tcp_usr_connect(struct socket so, struct* sockaddr nam, struct* proc *p)
449	{
450	int error = `0`;
451	struct inpcb *inp = sotoinpcb(so);
452	struct tcpcb *tp;
453	struct sockaddr_in *sinp;
454
455	TCPDEBUG0;
456	if (inp == NULL) {
457	return EINVAL;
458	} else if (inp->inp_state == INPCB_STATE_DEAD) {
459	if (so->so_error) {
460	error = so->so_error;
461	so->so_error = `0`;
462	return error;
463	} else
464	return EINVAL;
465	}
466	#if NECP
467	#if FLOW_DIVERT
468	else if (necp_socket_should_use_flow_divert(inp)) {
469	uint32_t fd_ctl_unit = necp_socket_get_flow_divert_control_unit(inp);
470	if (fd_ctl_unit > `0`) {
471	error = flow_divert_pcb_init(so, fd_ctl_unit);
472	if (error == `0`) {
473	error = flow_divert_connect_out(so, nam, p);
474	}
475	} else {
476	error = ENETDOWN;
477	}
478
479	return error;
480	}
481	#endif /* FLOW_DIVERT */
482	#if CONTENT_FILTER
483	error = cfil_sock_attach(so);
484	if (error != `0`)
485	return error;
486	#endif /* CONTENT_FILTER */
487	#endif /* NECP */
488	tp = intotcpcb(inp);
489	TCPDEBUG1();
490
491	calculate_tcp_clock();
492
493	if (nam->sa_family != `0` && nam->sa_family != AF_INET) {
494	error = EAFNOSUPPORT;
495	goto out;
496	}
497	/*
498	* Must disallow TCP ``connections'' to multicast addresses.
499	*/
500	sinp = (struct sockaddr_in )(void* *)nam;
501	if (sinp->sin_family == AF_INET
502	&& IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
503	error = EAFNOSUPPORT;
504	goto out;
505	}
506
507	if ((error = tcp_connect(tp, nam, p)) != `0`)
508	goto out;
509
510	error = tcp_connect_complete(so);
511
512	COMMON_END(PRU_CONNECT);
513	}
514
515	static int
516	tcp_usr_connectx_common(struct socket so, int* af,
517	struct sockaddr src, struct* sockaddr *dst,
518	struct proc p, uint32_t ifscope, sae_associd_t aid, sae_connid_t pcid,
519	uint32_t flags, void arg, uint32_t arglen, struct* uio *auio,
520	user_ssize_t *bytes_written)
521	{
522	#pragma unused(aid, flags, arg, arglen)
523	struct inpcb *inp = sotoinpcb(so);
524	int error = `0`;
525	user_ssize_t datalen = `0`;
526
527	if (inp == NULL)
528	return (EINVAL);
529
530	VERIFY(dst != NULL);
531
532	ASSERT(!(inp->inp_flags2 & INP2_CONNECT_IN_PROGRESS));
533	inp->inp_flags2 \|= INP2_CONNECT_IN_PROGRESS;
534
535	#if NECP
536	inp_update_necp_policy(inp, src, dst, ifscope);
537	#endif /* NECP */
538
539	if ((so->so_flags1 & SOF1_DATA_IDEMPOTENT) &&
540	(tcp_fastopen & TCP_FASTOPEN_CLIENT))
541	sototcpcb(so)->t_flagsext \|= TF_FASTOPEN;
542
543	/ bind socket to the specified interface, if requested /
544	if (ifscope != IFSCOPE_NONE &&
545	(error = inp_bindif(inp, ifscope, NULL)) != `0`) {
546	goto done;
547	}
548
549	/ if source address and/or port is specified, bind to it /
550	if (src != NULL) {
551	error = sobindlock(so, src, `0`); / already locked /
552	if (error != `0`) {
553	goto done;
554	}
555	}
556
557	switch (af) {
558	case AF_INET:
559	error = tcp_usr_connect(so, dst, p);
560	break;
561	#if INET6
562	case AF_INET6:
563	error = tcp6_usr_connect(so, dst, p);
564	break;
565	#endif /* INET6 */
566	default:
567	VERIFY(`0`);
568	/ NOTREACHED /
569	}
570
571	if (error != `0`) {
572	goto done;
573	}
574
575	/ if there is data, copy it /
576	if (auio != NULL) {
577	socket_unlock(so, `0`);
578
579	VERIFY(bytes_written != NULL);
580
581	datalen = uio_resid(auio);
582	error = so->so_proto->pr_usrreqs->pru_sosend(so, NULL,
583	(uio_t)auio, NULL, NULL, `0`);
584	socket_lock(so, `0`);
585
586	if (error == `0` \|\| error == EWOULDBLOCK)
587	*bytes_written = datalen - uio_resid(auio);
588
589	/*
590	* sosend returns EWOULDBLOCK if it's a non-blocking
591	* socket or a timeout occured (this allows to return
592	* the amount of queued data through sendit()).
593	*
594	* However, connectx() returns EINPROGRESS in case of a
595	* blocking socket. So we change the return value here.
596	*/
597	if (error == EWOULDBLOCK)
598	error = EINPROGRESS;
599	}
600
601	if (error == `0` && pcid != NULL)
602	pcid = `1`; /* there is only one connection in regular TCP /
603
604	done:
605	if (error && error != EINPROGRESS)
606	so->so_flags1 &= ~SOF1_PRECONNECT_DATA;
607
608	inp->inp_flags2 &= ~INP2_CONNECT_IN_PROGRESS;
609	return (error);
610	}
611
612	static int
613	tcp_usr_connectx(struct socket so, struct* sockaddr *src,
614	struct sockaddr dst, struct* proc *p, uint32_t ifscope,
615	sae_associd_t aid, sae_connid_t pcid, uint32_t flags, void* *arg,
616	uint32_t arglen, struct uio uio, user_ssize_t bytes_written)
617	{
618	return (tcp_usr_connectx_common(so, AF_INET, src, dst, p, ifscope, aid,
619	pcid, flags, arg, arglen, uio, bytes_written));
620	}
621
622	#if INET6
623	static int
624	tcp6_usr_connect(struct socket so, struct* sockaddr nam, struct* proc *p)
625	{
626	int error = `0`;
627	struct inpcb *inp = sotoinpcb(so);
628	struct tcpcb *tp;
629	struct sockaddr_in6 *sin6p;
630
631	TCPDEBUG0;
632	if (inp == NULL) {
633	return EINVAL;
634	} else if (inp->inp_state == INPCB_STATE_DEAD) {
635	if (so->so_error) {
636	error = so->so_error;
637	so->so_error = `0`;
638	return error;
639	} else
640	return EINVAL;
641	}
642	#if NECP
643	#if FLOW_DIVERT
644	else if (necp_socket_should_use_flow_divert(inp)) {
645	uint32_t fd_ctl_unit = necp_socket_get_flow_divert_control_unit(inp);
646	if (fd_ctl_unit > `0`) {
647	error = flow_divert_pcb_init(so, fd_ctl_unit);
648	if (error == `0`) {
649	error = flow_divert_connect_out(so, nam, p);
650	}
651	} else {
652	error = ENETDOWN;
653	}
654
655	return error;
656	}
657	#endif /* FLOW_DIVERT */
658	#if CONTENT_FILTER
659	error = cfil_sock_attach(so);
660	if (error != `0`)
661	return error;
662	#endif /* CONTENT_FILTER */
663	#endif /* NECP */
664
665	tp = intotcpcb(inp);
666	TCPDEBUG1();
667
668	calculate_tcp_clock();
669
670	if (nam->sa_family != `0` && nam->sa_family != AF_INET6) {
671	error = EAFNOSUPPORT;
672	goto out;
673	}
674
675	/*
676	* Must disallow TCP ``connections'' to multicast addresses.
677	*/
678	sin6p = (struct sockaddr_in6 )(void* *)nam;
679	if (sin6p->sin6_family == AF_INET6
680	&& IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
681	error = EAFNOSUPPORT;
682	goto out;
683	}
684
685	if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
686	struct sockaddr_in sin;
687
688	if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != `0`)
689	return (EINVAL);
690
691	in6_sin6_2_sin(&sin, sin6p);
692	inp->inp_vflag \|= INP_IPV4;
693	inp->inp_vflag &= ~INP_IPV6;
694	if ((error = tcp_connect(tp, (struct sockaddr *)&sin, p)) != `0`)
695	goto out;
696
697	error = tcp_connect_complete(so);
698	goto out;
699	}
700	inp->inp_vflag &= ~INP_IPV4;
701	inp->inp_vflag \|= INP_IPV6;
702	if ((error = tcp6_connect(tp, nam, p)) != `0`)
703	goto out;
704
705	error = tcp_connect_complete(so);
706	COMMON_END(PRU_CONNECT);
707	}
708
709	static int
710	tcp6_usr_connectx(struct socket so, struct* sockaddr*src,
711	struct sockaddr dst, struct* proc *p, uint32_t ifscope,
712	sae_associd_t aid, sae_connid_t pcid, uint32_t flags, void* *arg,
713	uint32_t arglen, struct uio uio, user_ssize_t bytes_written)
714	{
715	return (tcp_usr_connectx_common(so, AF_INET6, src, dst, p, ifscope, aid,
716	pcid, flags, arg, arglen, uio, bytes_written));
717	}
718	#endif /* INET6 */
719
720	/*
721	* Initiate disconnect from peer.
722	* If connection never passed embryonic stage, just drop;
723	* else if don't need to let data drain, then can just drop anyways,
724	* else have to begin TCP shutdown process: mark socket disconnecting,
725	* drain unread data, state switch to reflect user close, and
726	* send segment (e.g. FIN) to peer. Socket will be really disconnected
727	* when peer sends FIN and acks ours.
728	*
729	* SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
730	*/
731	static int
732	tcp_usr_disconnect(struct socket *so)
733	{
734	int error = `0`;
735	struct inpcb *inp = sotoinpcb(so);
736	struct tcpcb *tp;
737
738	socket_lock_assert_owned(so);
739	COMMON_START();
740	/ In case we got disconnected from the peer /
741	if (tp == NULL)
742	goto out;
743	tp = tcp_disconnect(tp);
744	COMMON_END(PRU_DISCONNECT);
745	}
746
747	/*
748	* User-protocol pru_disconnectx callback.
749	*/
750	static int
751	tcp_usr_disconnectx(struct socket *so, sae_associd_t aid, sae_connid_t cid)
752	{
753	#pragma unused(cid)
754	if (aid != SAE_ASSOCID_ANY && aid != SAE_ASSOCID_ALL)
755	return (EINVAL);
756
757	return (tcp_usr_disconnect(so));
758	}
759
760	/*
761	* Accept a connection. Essentially all the work is
762	* done at higher levels; just return the address
763	* of the peer, storing through addr.
764	*/
765	static int
766	tcp_usr_accept(struct socket so, struct* sockaddr **nam)
767	{
768	int error = `0`;
769	struct inpcb *inp = sotoinpcb(so);
770	struct tcpcb *tp = NULL;
771	TCPDEBUG0;
772
773	in_getpeeraddr(so, nam);
774
775	if (so->so_state & SS_ISDISCONNECTED) {
776	error = ECONNABORTED;
777	goto out;
778	}
779	if (inp == NULL \|\| inp->inp_state == INPCB_STATE_DEAD)
780	return (EINVAL);
781	#if NECP
782	else if (necp_socket_should_use_flow_divert(inp))
783	return (EPROTOTYPE);
784	#if CONTENT_FILTER
785	error = cfil_sock_attach(so);
786	if (error != `0`)
787	return (error);
788	#endif /* CONTENT_FILTER */
789	#endif /* NECP */
790
791	tp = intotcpcb(inp);
792	TCPDEBUG1();
793
794	calculate_tcp_clock();
795
796	COMMON_END(PRU_ACCEPT);
797	}
798
799	#if INET6
800	static int
801	tcp6_usr_accept(struct socket so, struct* sockaddr **nam)
802	{
803	int error = `0`;
804	struct inpcb *inp = sotoinpcb(so);
805	struct tcpcb *tp = NULL;
806	TCPDEBUG0;
807
808	if (so->so_state & SS_ISDISCONNECTED) {
809	error = ECONNABORTED;
810	goto out;
811	}
812	if (inp == NULL \|\| inp->inp_state == INPCB_STATE_DEAD)
813	return (EINVAL);
814	#if NECP
815	else if (necp_socket_should_use_flow_divert(inp))
816	return (EPROTOTYPE);
817	#if CONTENT_FILTER
818	error = cfil_sock_attach(so);
819	if (error != `0`)
820	return (error);
821	#endif /* CONTENT_FILTER */
822	#endif /* NECP */
823
824	tp = intotcpcb(inp);
825	TCPDEBUG1();
826
827	calculate_tcp_clock();
828
829	in6_mapped_peeraddr(so, nam);
830	COMMON_END(PRU_ACCEPT);
831	}
832	#endif /* INET6 */
833
834	/*
835	* Mark the connection as being incapable of further output.
836	*
837	* Returns: 0 Success
838	* EINVAL [COMMON_START]
839	* tcp_output:EADDRNOTAVAIL
840	* tcp_output:ENOBUFS
841	* tcp_output:EMSGSIZE
842	* tcp_output:EHOSTUNREACH
843	* tcp_output:ENETUNREACH
844	* tcp_output:ENETDOWN
845	* tcp_output:ENOMEM
846	* tcp_output:EACCES
847	* tcp_output:EMSGSIZE
848	* tcp_output:ENOBUFS
849	* tcp_output:??? [ignorable: mostly IPSEC/firewall/DLIL]
850	*/
851	static int
852	tcp_usr_shutdown(struct socket *so)
853	{
854	int error = `0`;
855	struct inpcb *inp = sotoinpcb(so);
856	struct tcpcb *tp;
857
858	TCPDEBUG0;
859	if (inp == NULL \|\| inp->inp_state == INPCB_STATE_DEAD)
860	return (EINVAL);
861
862	socantsendmore(so);
863
864	/*
865	* In case we got disconnected from the peer, or if this is
866	* a socket that is to be flow-diverted (but not yet).
867	*/
868	tp = intotcpcb(inp);
869	TCPDEBUG1();
870
871	if (tp == NULL
872	#if NECP
873	\|\| (necp_socket_should_use_flow_divert(inp))
874	#endif /* NECP */
875	) {
876	if (tp != NULL)
877	error = EPROTOTYPE;
878	goto out;
879	}
880
881	calculate_tcp_clock();
882
883	tp = tcp_usrclosed(tp);
884	#if MPTCP
885	/ A reset has been sent but socket exists, do not send FIN /
886	if ((so->so_flags & SOF_MP_SUBFLOW) &&
887	(tp) && (tp->t_mpflags & TMPF_RESET)) {
888	goto out;
889	}
890	#endif
891	#if CONTENT_FILTER
892	/ Don't send a FIN yet /
893	if (tp && !(so->so_state & SS_ISDISCONNECTED) &&
894	cfil_sock_data_pending(&so->so_snd))
895	goto out;
896	#endif /* CONTENT_FILTER */
897	if (tp)
898	error = tcp_output(tp);
899	COMMON_END(PRU_SHUTDOWN);
900	}
901
902	/*
903	* After a receive, possibly send window update to peer.
904	*/
905	static int
906	tcp_usr_rcvd(struct socket so, __unused int* flags)
907	{
908	int error = `0`;
909	struct inpcb *inp = sotoinpcb(so);
910	struct tcpcb *tp;
911
912	COMMON_START();
913	/ In case we got disconnected from the peer /
914	if (tp == NULL)
915	goto out;
916	tcp_sbrcv_trim(tp, &so->so_rcv);
917
918	/*
919	* This tcp_output is solely there to trigger window-updates.
920	* However, we really do not want these window-updates while we
921	* are still in SYN_SENT or SYN_RECEIVED.
922	*/
923	if (TCPS_HAVEESTABLISHED(tp->t_state))
924	tcp_output(tp);
925
926	#if CONTENT_FILTER
927	cfil_sock_buf_update(&so->so_rcv);
928	#endif /* CONTENT_FILTER */
929
930	COMMON_END(PRU_RCVD);
931	}
932
933	/*
934	* Do a send by putting data in output queue and updating urgent
935	* marker if URG set. Possibly send more data. Unlike the other
936	* pru_*() routines, the mbuf chains are our responsibility. We
937	* must either enqueue them or free them. The other pru_* routines
938	* generally are caller-frees.
939	*
940	* Returns: 0 Success
941	* ECONNRESET
942	* EINVAL
943	* ENOBUFS
944	* tcp_connect:EADDRINUSE Address in use
945	* tcp_connect:EADDRNOTAVAIL Address not available.
946	* tcp_connect:EINVAL Invalid argument
947	* tcp_connect:EAFNOSUPPORT Address family not supported [notdef]
948	* tcp_connect:EACCES Permission denied
949	* tcp_connect:EAGAIN Resource unavailable, try again
950	* tcp_connect:EPERM Operation not permitted
951	* tcp_output:EADDRNOTAVAIL
952	* tcp_output:ENOBUFS
953	* tcp_output:EMSGSIZE
954	* tcp_output:EHOSTUNREACH
955	* tcp_output:ENETUNREACH
956	* tcp_output:ENETDOWN
957	* tcp_output:ENOMEM
958	* tcp_output:EACCES
959	* tcp_output:EMSGSIZE
960	* tcp_output:ENOBUFS
961	* tcp_output:??? [ignorable: mostly IPSEC/firewall/DLIL]
962	* tcp6_connect:??? [IPV6 only]
963	*/
964	static int
965	tcp_usr_send(struct socket so, int* flags, struct mbuf *m,
966	struct sockaddr nam, struct* mbuf control, struct* proc *p)
967	{
968	int error = `0`;
969	struct inpcb *inp = sotoinpcb(so);
970	struct tcpcb *tp;
971	uint32_t msgpri = MSG_PRI_DEFAULT;
972	#if INET6
973	int isipv6;
974	#endif
975	TCPDEBUG0;
976
977	if (inp == NULL \|\| inp->inp_state == INPCB_STATE_DEAD
978	#if NECP
979	\|\| (necp_socket_should_use_flow_divert(inp))
980	#endif /* NECP */
981	) {
982	/*
983	* OOPS! we lost a race, the TCP session got reset after
984	* we checked SS_CANTSENDMORE, eg: while doing uiomove or a
985	* network interrupt in the non-splnet() section of sosend().
986	*/
987	if (m != NULL)
988	m_freem(m);
989	if (control != NULL) {
990	m_freem(control);
991	control = NULL;
992	}
993
994	if (inp == NULL)
995	error = ECONNRESET; / XXX EPIPE? /
996	else
997	error = EPROTOTYPE;
998	tp = NULL;
999	TCPDEBUG1();
1000	goto out;
1001	}
1002	#if INET6
1003	isipv6 = nam && nam->sa_family == AF_INET6;
1004	#endif /* INET6 */
1005	tp = intotcpcb(inp);
1006	TCPDEBUG1();
1007
1008	calculate_tcp_clock();
1009
1010	if (control != NULL) {
1011	if (so->so_flags & SOF_ENABLE_MSGS) {
1012	/ Get the msg priority from control mbufs /
1013	error = tcp_get_msg_priority(control, &msgpri);
1014	if (error) {
1015	m_freem(control);
1016	if (m != NULL)
1017	m_freem(m);
1018	control = NULL;
1019	m = NULL;
1020	goto out;
1021	}
1022	m_freem(control);
1023	control = NULL;
1024	} else if (control->m_len) {
1025	/*
1026	* if not unordered, TCP should not have
1027	* control mbufs
1028	*/
1029	m_freem(control);
1030	if (m != NULL)
1031	m_freem(m);
1032	control = NULL;
1033	m = NULL;
1034	error = EINVAL;
1035	goto out;
1036	}
1037	}
1038
1039	if (so->so_flags & SOF_ENABLE_MSGS) {
1040	VERIFY(m->m_flags & M_PKTHDR);
1041	m->m_pkthdr.msg_pri = msgpri;
1042	}
1043
1044	/ MPTCP sublow socket buffers must not be compressed /
1045	VERIFY(!(so->so_flags & SOF_MP_SUBFLOW) \|\|
1046	(so->so_snd.sb_flags & SB_NOCOMPRESS));
1047
1048	if(!(flags & PRUS_OOB) \|\| (so->so_flags1 & SOF1_PRECONNECT_DATA)) {
1049	/ Call msg send if message delivery is enabled /
1050	if (so->so_flags & SOF_ENABLE_MSGS)
1051	sbappendmsg_snd(&so->so_snd, m);
1052	else
1053	sbappendstream(&so->so_snd, m);
1054
1055	if (nam && tp->t_state < TCPS_SYN_SENT) {
1056
1057	/*
1058	* Do implied connect if not yet connected,
1059	* initialize window to default value, and
1060	* initialize maxseg/maxopd using peer's cached
1061	* MSS.
1062	*/
1063	#if INET6
1064	if (isipv6)
1065	error = tcp6_connect(tp, nam, p);
1066	else
1067	#endif /* INET6 */
1068	error = tcp_connect(tp, nam, p);
1069	if (error)
1070	goto out;
1071	tp->snd_wnd = TTCP_CLIENT_SND_WND;
1072	tp->max_sndwnd = tp->snd_wnd;
1073	tcp_mss(tp, -`1`, IFSCOPE_NONE);
1074	}
1075
1076	if (flags & PRUS_EOF) {
1077	/*
1078	* Close the send side of the connection after
1079	* the data is sent.
1080	*/
1081	socantsendmore(so);
1082	tp = tcp_usrclosed(tp);
1083	}
1084	if (tp != NULL) {
1085	if (flags & PRUS_MORETOCOME)
1086	tp->t_flags \|= TF_MORETOCOME;
1087	error = tcp_output(tp);
1088	if (flags & PRUS_MORETOCOME)
1089	tp->t_flags &= ~TF_MORETOCOME;
1090	}
1091	} else {
1092	if (sbspace(&so->so_snd) == `0`) {
1093	/ if no space is left in sockbuf,*
1094	* do not try to squeeze in OOB traffic */
1095	m_freem(m);
1096	error = ENOBUFS;
1097	goto out;
1098	}
1099	/*
1100	* According to RFC961 (Assigned Protocols),
1101	* the urgent pointer points to the last octet
1102	* of urgent data. We continue, however,
1103	* to consider it to indicate the first octet
1104	* of data past the urgent section.
1105	* Otherwise, snd_up should be one lower.
1106	*/
1107	sbappendstream(&so->so_snd, m);
1108	if (nam && tp->t_state < TCPS_SYN_SENT) {
1109	/*
1110	* Do implied connect if not yet connected,
1111	* initialize window to default value, and
1112	* initialize maxseg/maxopd using peer's cached
1113	* MSS.
1114	*/
1115	#if INET6
1116	if (isipv6)
1117	error = tcp6_connect(tp, nam, p);
1118	else
1119	#endif /* INET6 */
1120	error = tcp_connect(tp, nam, p);
1121	if (error)
1122	goto out;
1123	tp->snd_wnd = TTCP_CLIENT_SND_WND;
1124	tp->max_sndwnd = tp->snd_wnd;
1125	tcp_mss(tp, -`1`, IFSCOPE_NONE);
1126	}
1127	tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
1128	tp->t_flagsext \|= TF_FORCE;
1129	error = tcp_output(tp);
1130	tp->t_flagsext &= ~TF_FORCE;
1131	}
1132
1133
1134	/*
1135	* We wait for the socket to successfully connect before returning.
1136	* This allows us to signal a timeout to the application.
1137	*/
1138	if (so->so_state & SS_ISCONNECTING) {
1139	if (so->so_state & SS_NBIO)
1140	error = EWOULDBLOCK;
1141	else
1142	error = sbwait(&so->so_snd);
1143	}
1144
1145	COMMON_END((flags & PRUS_OOB) ? PRU_SENDOOB :
1146	((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1147	}
1148
1149	/*
1150	* Abort the TCP.
1151	*/
1152	static int
1153	tcp_usr_abort(struct socket *so)
1154	{
1155	int error = `0`;
1156	struct inpcb *inp = sotoinpcb(so);
1157	struct tcpcb *tp;
1158
1159	COMMON_START();
1160	/ In case we got disconnected from the peer /
1161	if (tp == NULL)
1162	goto out;
1163	tp = tcp_drop(tp, ECONNABORTED);
1164	VERIFY(so->so_usecount > `0`);
1165	so->so_usecount--;
1166	COMMON_END(PRU_ABORT);
1167	}
1168
1169	/*
1170	* Receive out-of-band data.
1171	*
1172	* Returns: 0 Success
1173	* EINVAL [COMMON_START]
1174	* EINVAL
1175	* EWOULDBLOCK
1176	*/
1177	static int
1178	tcp_usr_rcvoob(struct socket so, struct* mbuf m, int* flags)
1179	{
1180	int error = `0`;
1181	struct inpcb *inp = sotoinpcb(so);
1182	struct tcpcb *tp;
1183
1184	COMMON_START();
1185	if ((so->so_oobmark == `0` &&
1186	(so->so_state & SS_RCVATMARK) == `0`) \|\|
1187	so->so_options & SO_OOBINLINE \|\|
1188	tp->t_oobflags & TCPOOB_HADDATA) {
1189	error = EINVAL;
1190	goto out;
1191	}
1192	if ((tp->t_oobflags & TCPOOB_HAVEDATA) == `0`) {
1193	error = EWOULDBLOCK;
1194	goto out;
1195	}
1196	m->m_len = `1`;
1197	*mtod(m, caddr_t) = tp->t_iobc;
1198	so->so_state &= ~SS_RCVATMARK;
1199	if ((flags & MSG_PEEK) == `0`)
1200	tp->t_oobflags ^= (TCPOOB_HAVEDATA \| TCPOOB_HADDATA);
1201	COMMON_END(PRU_RCVOOB);
1202	}
1203
1204	static int
1205	tcp_usr_preconnect(struct socket *so)
1206	{
1207	struct inpcb *inp = sotoinpcb(so);
1208	int error = `0`;
1209
1210	#if NECP
1211	if (necp_socket_should_use_flow_divert(inp)) {
1212	/ May happen, if in tcp_usr_connect we did not had a chance*
1213	* to set the usrreqs (due to some error). So, let's get out
1214	* of here.
1215	*/
1216	goto out;
1217	}
1218	#endif /* NECP */
1219
1220	error = tcp_output(sototcpcb(so));
1221
1222	soclearfastopen(so);
1223
1224	COMMON_END(PRU_PRECONNECT);
1225	}
1226
1227	/ xxx - should be const /
1228	struct pr_usrreqs tcp_usrreqs = {
1229	.pru_abort = tcp_usr_abort,
1230	.pru_accept = tcp_usr_accept,
1231	.pru_attach = tcp_usr_attach,
1232	.pru_bind = tcp_usr_bind,
1233	.pru_connect = tcp_usr_connect,
1234	.pru_connectx = tcp_usr_connectx,
1235	.pru_control = in_control,
1236	.pru_detach = tcp_usr_detach,
1237	.pru_disconnect = tcp_usr_disconnect,
1238	.pru_disconnectx = tcp_usr_disconnectx,
1239	.pru_listen = tcp_usr_listen,
1240	.pru_peeraddr = in_getpeeraddr,
1241	.pru_rcvd = tcp_usr_rcvd,
1242	.pru_rcvoob = tcp_usr_rcvoob,
1243	.pru_send = tcp_usr_send,
1244	.pru_shutdown = tcp_usr_shutdown,
1245	.pru_sockaddr = in_getsockaddr,
1246	.pru_sosend = sosend,
1247	.pru_soreceive = soreceive,
1248	.pru_preconnect = tcp_usr_preconnect,
1249	};
1250
1251	#if INET6
1252	struct pr_usrreqs tcp6_usrreqs = {
1253	.pru_abort = tcp_usr_abort,
1254	.pru_accept = tcp6_usr_accept,
1255	.pru_attach = tcp_usr_attach,
1256	.pru_bind = tcp6_usr_bind,
1257	.pru_connect = tcp6_usr_connect,
1258	.pru_connectx = tcp6_usr_connectx,
1259	.pru_control = in6_control,
1260	.pru_detach = tcp_usr_detach,
1261	.pru_disconnect = tcp_usr_disconnect,
1262	.pru_disconnectx = tcp_usr_disconnectx,
1263	.pru_listen = tcp6_usr_listen,
1264	.pru_peeraddr = in6_mapped_peeraddr,
1265	.pru_rcvd = tcp_usr_rcvd,
1266	.pru_rcvoob = tcp_usr_rcvoob,
1267	.pru_send = tcp_usr_send,
1268	.pru_shutdown = tcp_usr_shutdown,
1269	.pru_sockaddr = in6_mapped_sockaddr,
1270	.pru_sosend = sosend,
1271	.pru_soreceive = soreceive,
1272	.pru_preconnect = tcp_usr_preconnect,
1273	};
1274	#endif /* INET6 */
1275
1276	/*
1277	* Common subroutine to open a TCP connection to remote host specified
1278	* by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
1279	* port number if needed. Call in_pcbladdr to do the routing and to choose
1280	* a local host address (interface). If there is an existing incarnation
1281	* of the same connection in TIME-WAIT state and if the remote host was
1282	* sending CC options and if the connection duration was < MSL, then
1283	* truncate the previous TIME-WAIT state and proceed.
1284	* Initialize connection parameters and enter SYN-SENT state.
1285	*
1286	* Returns: 0 Success
1287	* EADDRINUSE
1288	* EINVAL
1289	* in_pcbbind:EADDRNOTAVAIL Address not available.
1290	* in_pcbbind:EINVAL Invalid argument
1291	* in_pcbbind:EAFNOSUPPORT Address family not supported [notdef]
1292	* in_pcbbind:EACCES Permission denied
1293	* in_pcbbind:EADDRINUSE Address in use
1294	* in_pcbbind:EAGAIN Resource unavailable, try again
1295	* in_pcbbind:EPERM Operation not permitted
1296	* in_pcbladdr:EINVAL Invalid argument
1297	* in_pcbladdr:EAFNOSUPPORT Address family not supported
1298	* in_pcbladdr:EADDRNOTAVAIL Address not available
1299	*/
1300	static int
1301	tcp_connect(struct tcpcb tp, struct* sockaddr nam, struct* proc *p)
1302	{
1303	struct inpcb inp = tp->t_inpcb, oinp;
1304	struct socket *so = inp->inp_socket;
1305	struct tcpcb *otp;
1306	struct sockaddr_in sin = (struct* sockaddr_in )(void* *)nam;
1307	struct in_addr laddr;
1308	int error = `0`;
1309	struct ifnet *outif = NULL;
1310
1311	if (inp->inp_lport == `0`) {
1312	error = in_pcbbind(inp, NULL, p);
1313	if (error)
1314	goto done;
1315	}
1316
1317	/*
1318	* Cannot simply call in_pcbconnect, because there might be an
1319	* earlier incarnation of this same connection still in
1320	* TIME_WAIT state, creating an ADDRINUSE error.
1321	*/
1322	error = in_pcbladdr(inp, nam, &laddr, IFSCOPE_NONE, &outif, `0`);
1323	if (error)
1324	goto done;
1325
1326	socket_unlock(inp->inp_socket, `0`);
1327	oinp = in_pcblookup_hash(inp->inp_pcbinfo,
1328	sin->sin_addr, sin->sin_port,
1329	inp->inp_laddr.s_addr != INADDR_ANY ? inp->inp_laddr : laddr,
1330	inp->inp_lport, `0`, NULL);
1331
1332	socket_lock(inp->inp_socket, `0`);
1333	if (oinp) {
1334	if (oinp != inp) / 4143933: avoid deadlock if inp == oinp /
1335	socket_lock(oinp->inp_socket, `1`);
1336	if (in_pcb_checkstate(oinp, WNT_RELEASE, `1`) == WNT_STOPUSING) {
1337	if (oinp != inp)
1338	socket_unlock(oinp->inp_socket, `1`);
1339	goto skip_oinp;
1340	}
1341
1342	if (oinp != inp && (otp = intotcpcb(oinp)) != NULL &&
1343	otp->t_state == TCPS_TIME_WAIT &&
1344	((int)(tcp_now - otp->t_starttime)) < tcp_msl &&
1345	(otp->t_flags & TF_RCVD_CC)) {
1346	otp = tcp_close(otp);
1347	} else {
1348	printf("tcp_connect: inp=0x%llx err=EADDRINUSE\n",
1349	(uint64_t)VM_KERNEL_ADDRPERM(inp));
1350	if (oinp != inp)
1351	socket_unlock(oinp->inp_socket, `1`);
1352	error = EADDRINUSE;
1353	goto done;
1354	}
1355	if (oinp != inp)
1356	socket_unlock(oinp->inp_socket, `1`);
1357	}
1358	skip_oinp:
1359	if ((inp->inp_laddr.s_addr == INADDR_ANY ? laddr.s_addr :
1360	inp->inp_laddr.s_addr) == sin->sin_addr.s_addr &&
1361	inp->inp_lport == sin->sin_port) {
1362	error = EINVAL;
1363	goto done;
1364	}
1365	if (!lck_rw_try_lock_exclusive(inp->inp_pcbinfo->ipi_lock)) {
1366	/lock inversion issue, mostly with udp multicast packets /
1367	socket_unlock(inp->inp_socket, `0`);
1368	lck_rw_lock_exclusive(inp->inp_pcbinfo->ipi_lock);
1369	socket_lock(inp->inp_socket, `0`);
1370	}
1371	if (inp->inp_laddr.s_addr == INADDR_ANY) {
1372	inp->inp_laddr = laddr;
1373	/ no reference needed /
1374	inp->inp_last_outifp = outif;
1375
1376	inp->inp_flags \|= INP_INADDR_ANY;
1377	}
1378	inp->inp_faddr = sin->sin_addr;
1379	inp->inp_fport = sin->sin_port;
1380	in_pcbrehash(inp);
1381	lck_rw_done(inp->inp_pcbinfo->ipi_lock);
1382
1383	if (inp->inp_flowhash == `0`)
1384	inp->inp_flowhash = inp_calc_flowhash(inp);
1385
1386	tcp_set_max_rwinscale(tp, so, outif);
1387
1388	soisconnecting(so);
1389	tcpstat.tcps_connattempt++;
1390	tp->t_state = TCPS_SYN_SENT;
1391	tp->t_timer[TCPT_KEEP] = OFFSET_FROM_START(tp, TCP_CONN_KEEPINIT(tp));
1392	tp->iss = tcp_new_isn(tp);
1393	tcp_sendseqinit(tp);
1394	if (nstat_collect)
1395	nstat_route_connect_attempt(inp->inp_route.ro_rt);
1396
1397	done:
1398	if (outif != NULL)
1399	ifnet_release(outif);
1400
1401	return (error);
1402	}
1403
1404	#if INET6
1405	static int
1406	tcp6_connect(struct tcpcb tp, struct* sockaddr nam, struct* proc *p)
1407	{
1408	struct inpcb inp = tp->t_inpcb, oinp;
1409	struct socket *so = inp->inp_socket;
1410	struct tcpcb *otp;
1411	struct sockaddr_in6 sin6 = (struct* sockaddr_in6 )(void* *)nam;
1412	struct in6_addr addr6;
1413	int error = `0`;
1414	struct ifnet *outif = NULL;
1415
1416	if (inp->inp_lport == `0`) {
1417	error = in6_pcbbind(inp, NULL, p);
1418	if (error)
1419	goto done;
1420	}
1421
1422	/*
1423	* Cannot simply call in_pcbconnect, because there might be an
1424	* earlier incarnation of this same connection still in
1425	* TIME_WAIT state, creating an ADDRINUSE error.
1426	*
1427	* in6_pcbladdr() might return an ifp with its reference held
1428	* even in the error case, so make sure that it's released
1429	* whenever it's non-NULL.
1430	*/
1431	error = in6_pcbladdr(inp, nam, &addr6, &outif);
1432	if (error)
1433	goto done;
1434	socket_unlock(inp->inp_socket, `0`);
1435	oinp = in6_pcblookup_hash(inp->inp_pcbinfo,
1436	&sin6->sin6_addr, sin6->sin6_port,
1437	IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
1438	? &addr6
1439	: &inp->in6p_laddr,
1440	inp->inp_lport, `0`, NULL);
1441	socket_lock(inp->inp_socket, `0`);
1442	if (oinp) {
1443	if (oinp != inp && (otp = intotcpcb(oinp)) != NULL &&
1444	otp->t_state == TCPS_TIME_WAIT &&
1445	((int)(tcp_now - otp->t_starttime)) < tcp_msl &&
1446	(otp->t_flags & TF_RCVD_CC)) {
1447	otp = tcp_close(otp);
1448	} else {
1449	error = EADDRINUSE;
1450	goto done;
1451	}
1452	}
1453	if (!lck_rw_try_lock_exclusive(inp->inp_pcbinfo->ipi_lock)) {
1454	/lock inversion issue, mostly with udp multicast packets /
1455	socket_unlock(inp->inp_socket, `0`);
1456	lck_rw_lock_exclusive(inp->inp_pcbinfo->ipi_lock);
1457	socket_lock(inp->inp_socket, `0`);
1458	}
1459	if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1460	inp->in6p_laddr = addr6;
1461	inp->in6p_last_outifp = outif; / no reference needed /
1462	inp->in6p_flags \|= INP_IN6ADDR_ANY;
1463	}
1464	inp->in6p_faddr = sin6->sin6_addr;
1465	inp->inp_fport = sin6->sin6_port;
1466	if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != `0`)
1467	inp->inp_flow = sin6->sin6_flowinfo;
1468	in_pcbrehash(inp);
1469	lck_rw_done(inp->inp_pcbinfo->ipi_lock);
1470
1471	if (inp->inp_flowhash == `0`)
1472	inp->inp_flowhash = inp_calc_flowhash(inp);
1473	/ update flowinfo - RFC 6437 /
1474	if (inp->inp_flow == `0` && inp->in6p_flags & IN6P_AUTOFLOWLABEL) {
1475	inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
1476	inp->inp_flow \|=
1477	(htonl(inp->inp_flowhash) & IPV6_FLOWLABEL_MASK);
1478	}
1479
1480	tcp_set_max_rwinscale(tp, so, outif);
1481
1482	soisconnecting(so);
1483	tcpstat.tcps_connattempt++;
1484	tp->t_state = TCPS_SYN_SENT;
1485	tp->t_timer[TCPT_KEEP] = OFFSET_FROM_START(tp,
1486	TCP_CONN_KEEPINIT(tp));
1487	tp->iss = tcp_new_isn(tp);
1488	tcp_sendseqinit(tp);
1489	if (nstat_collect)
1490	nstat_route_connect_attempt(inp->inp_route.ro_rt);
1491
1492	done:
1493	if (outif != NULL)
1494	ifnet_release(outif);
1495
1496	return (error);
1497	}
1498	#endif /* INET6 */
1499
1500	/*
1501	* Export TCP internal state information via a struct tcp_info
1502	*/
1503	void
1504	tcp_fill_info(struct tcpcb tp, struct* tcp_info *ti)
1505	{
1506	struct inpcb *inp = tp->t_inpcb;
1507
1508	bzero(ti, sizeof(*ti));
1509
1510	ti->tcpi_state = tp->t_state;
1511	ti->tcpi_flowhash = inp->inp_flowhash;
1512
1513	if (tp->t_state > TCPS_LISTEN) {
1514	if (TSTMP_SUPPORTED(tp))
1515	ti->tcpi_options \|= TCPI_OPT_TIMESTAMPS;
1516	if (SACK_ENABLED(tp))
1517	ti->tcpi_options \|= TCPI_OPT_SACK;
1518	if (TCP_WINDOW_SCALE_ENABLED(tp)) {
1519	ti->tcpi_options \|= TCPI_OPT_WSCALE;
1520	ti->tcpi_snd_wscale = tp->snd_scale;
1521	ti->tcpi_rcv_wscale = tp->rcv_scale;
1522	}
1523	if (TCP_ECN_ENABLED(tp))
1524	ti->tcpi_options \|= TCPI_OPT_ECN;
1525
1526	/ Are we in retranmission episode /
1527	if (IN_FASTRECOVERY(tp) \|\| tp->t_rxtshift > `0`)
1528	ti->tcpi_flags \|= TCPI_FLAG_LOSSRECOVERY;
1529
1530	if (tp->t_flags & TF_STREAMING_ON)
1531	ti->tcpi_flags \|= TCPI_FLAG_STREAMING_ON;
1532
1533	ti->tcpi_rto = tp->t_timer[TCPT_REXMT] ? tp->t_rxtcur : `0`;
1534	ti->tcpi_snd_mss = tp->t_maxseg;
1535	ti->tcpi_rcv_mss = tp->t_maxseg;
1536
1537	ti->tcpi_rttcur = tp->t_rttcur;
1538	ti->tcpi_srtt = tp->t_srtt >> TCP_RTT_SHIFT;
1539	ti->tcpi_rttvar = tp->t_rttvar >> TCP_RTTVAR_SHIFT;
1540	ti->tcpi_rttbest = tp->t_rttbest >> TCP_RTT_SHIFT;
1541
1542	ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1543	ti->tcpi_snd_cwnd = tp->snd_cwnd;
1544	ti->tcpi_snd_sbbytes = inp->inp_socket->so_snd.sb_cc;
1545
1546	ti->tcpi_rcv_space = tp->rcv_wnd;
1547
1548	ti->tcpi_snd_wnd = tp->snd_wnd;
1549	ti->tcpi_snd_nxt = tp->snd_nxt;
1550	ti->tcpi_rcv_nxt = tp->rcv_nxt;
1551
1552	/ convert bytes/msec to bits/sec /
1553	if ((tp->t_flagsext & TF_MEASURESNDBW) != `0` &&
1554	tp->t_bwmeas != NULL) {
1555	ti->tcpi_snd_bw = (tp->t_bwmeas->bw_sndbw * `8000`);
1556	}
1557
1558	ti->tcpi_last_outif = (tp->t_inpcb->inp_last_outifp == NULL) ? `0` :
1559	tp->t_inpcb->inp_last_outifp->if_index;
1560
1561	//atomic_get_64(ti->tcpi_txbytes, &inp->inp_stat->txbytes);
1562	ti->tcpi_txpackets = inp->inp_stat->txpackets;
1563	ti->tcpi_txbytes = inp->inp_stat->txbytes;
1564	ti->tcpi_txretransmitbytes = tp->t_stat.txretransmitbytes;
1565	ti->tcpi_txretransmitpackets = tp->t_stat.rxmitpkts;
1566	ti->tcpi_txunacked = tp->snd_max - tp->snd_una;
1567
1568	//atomic_get_64(ti->tcpi_rxbytes, &inp->inp_stat->rxbytes);
1569	ti->tcpi_rxpackets = inp->inp_stat->rxpackets;
1570	ti->tcpi_rxbytes = inp->inp_stat->rxbytes;
1571	ti->tcpi_rxduplicatebytes = tp->t_stat.rxduplicatebytes;
1572	ti->tcpi_rxoutoforderbytes = tp->t_stat.rxoutoforderbytes;
1573
1574	if (tp->t_state > TCPS_LISTEN) {
1575	ti->tcpi_synrexmits = tp->t_stat.synrxtshift;
1576	}
1577	ti->tcpi_cell_rxpackets = inp->inp_cstat->rxpackets;
1578	ti->tcpi_cell_rxbytes = inp->inp_cstat->rxbytes;
1579	ti->tcpi_cell_txpackets = inp->inp_cstat->txpackets;
1580	ti->tcpi_cell_txbytes = inp->inp_cstat->txbytes;
1581
1582	ti->tcpi_wifi_rxpackets = inp->inp_wstat->rxpackets;
1583	ti->tcpi_wifi_rxbytes = inp->inp_wstat->rxbytes;
1584	ti->tcpi_wifi_txpackets = inp->inp_wstat->txpackets;
1585	ti->tcpi_wifi_txbytes = inp->inp_wstat->txbytes;
1586
1587	ti->tcpi_wired_rxpackets = inp->inp_Wstat->rxpackets;
1588	ti->tcpi_wired_rxbytes = inp->inp_Wstat->rxbytes;
1589	ti->tcpi_wired_txpackets = inp->inp_Wstat->txpackets;
1590	ti->tcpi_wired_txbytes = inp->inp_Wstat->txbytes;
1591	tcp_get_connectivity_status(tp, &ti->tcpi_connstatus);
1592
1593	ti->tcpi_tfo_syn_data_rcv = !!(tp->t_tfo_stats & TFO_S_SYNDATA_RCV);
1594	ti->tcpi_tfo_cookie_req_rcv = !!(tp->t_tfo_stats & TFO_S_COOKIEREQ_RECV);
1595	ti->tcpi_tfo_cookie_sent = !!(tp->t_tfo_stats & TFO_S_COOKIE_SENT);
1596	ti->tcpi_tfo_cookie_invalid = !!(tp->t_tfo_stats & TFO_S_COOKIE_INVALID);
1597
1598	ti->tcpi_tfo_cookie_req = !!(tp->t_tfo_stats & TFO_S_COOKIE_REQ);
1599	ti->tcpi_tfo_cookie_rcv = !!(tp->t_tfo_stats & TFO_S_COOKIE_RCV);
1600	ti->tcpi_tfo_syn_data_sent = !!(tp->t_tfo_stats & TFO_S_SYN_DATA_SENT);
1601	ti->tcpi_tfo_syn_data_acked = !!(tp->t_tfo_stats & TFO_S_SYN_DATA_ACKED);
1602	ti->tcpi_tfo_syn_loss = !!(tp->t_tfo_stats & TFO_S_SYN_LOSS);
1603	ti->tcpi_tfo_cookie_wrong = !!(tp->t_tfo_stats & TFO_S_COOKIE_WRONG);
1604	ti->tcpi_tfo_no_cookie_rcv = !!(tp->t_tfo_stats & TFO_S_NO_COOKIE_RCV);
1605	ti->tcpi_tfo_heuristics_disable = !!(tp->t_tfo_stats & TFO_S_HEURISTICS_DISABLE);
1606	ti->tcpi_tfo_send_blackhole = !!(tp->t_tfo_stats & TFO_S_SEND_BLACKHOLE);
1607	ti->tcpi_tfo_recv_blackhole = !!(tp->t_tfo_stats & TFO_S_RECV_BLACKHOLE);
1608	ti->tcpi_tfo_onebyte_proxy = !!(tp->t_tfo_stats & TFO_S_ONE_BYTE_PROXY);
1609
1610	ti->tcpi_ecn_client_setup = !!(tp->ecn_flags & TE_SETUPSENT);
1611	ti->tcpi_ecn_server_setup = !!(tp->ecn_flags & TE_SETUPRECEIVED);
1612	ti->tcpi_ecn_success = (tp->ecn_flags & TE_ECN_ON) == TE_ECN_ON ? `1` : `0`;
1613	ti->tcpi_ecn_lost_syn = !!(tp->ecn_flags & TE_LOST_SYN);
1614	ti->tcpi_ecn_lost_synack = !!(tp->ecn_flags & TE_LOST_SYNACK);
1615
1616	ti->tcpi_local_peer = !!(tp->t_flags & TF_LOCAL);
1617
1618	if (tp->t_inpcb->inp_last_outifp != NULL) {
1619	if (IFNET_IS_CELLULAR(tp->t_inpcb->inp_last_outifp))
1620	ti->tcpi_if_cell = `1`;
1621	if (IFNET_IS_WIFI(tp->t_inpcb->inp_last_outifp))
1622	ti->tcpi_if_wifi = `1`;
1623	if (IFNET_IS_WIRED(tp->t_inpcb->inp_last_outifp))
1624	ti->tcpi_if_wired = `1`;
1625	if (IFNET_IS_WIFI_INFRA(tp->t_inpcb->inp_last_outifp))
1626	ti->tcpi_if_wifi_infra = `1`;
1627	if (tp->t_inpcb->inp_last_outifp->if_eflags & IFEF_AWDL)
1628	ti->tcpi_if_wifi_awdl = `1`;
1629	}
1630	if (tp->tcp_cc_index == TCP_CC_ALGO_BACKGROUND_INDEX)
1631	ti->tcpi_snd_background = `1`;
1632	if (tcp_recv_bg == `1` \|\|
1633	IS_TCP_RECV_BG(tp->t_inpcb->inp_socket))
1634	ti->tcpi_rcv_background = `1`;
1635
1636	ti->tcpi_ecn_recv_ce = tp->t_ecn_recv_ce;
1637	ti->tcpi_ecn_recv_cwr = tp->t_ecn_recv_cwr;
1638
1639	ti->tcpi_rcvoopack = tp->t_rcvoopack;
1640	ti->tcpi_pawsdrop = tp->t_pawsdrop;
1641	ti->tcpi_sack_recovery_episode = tp->t_sack_recovery_episode;
1642	ti->tcpi_reordered_pkts = tp->t_reordered_pkts;
1643	ti->tcpi_dsack_sent = tp->t_dsack_sent;
1644	ti->tcpi_dsack_recvd = tp->t_dsack_recvd;
1645	}
1646	}
1647
1648	__private_extern__ errno_t
1649	tcp_fill_info_for_info_tuple(struct info_tuple itpl, struct* tcp_info *ti)
1650	{
1651	struct inpcbinfo *pcbinfo = NULL;
1652	struct inpcb *inp = NULL;
1653	struct socket *so;
1654	struct tcpcb *tp;
1655
1656	if (itpl->itpl_proto == IPPROTO_TCP)
1657	pcbinfo = &tcbinfo;
1658	else
1659	return EINVAL;
1660
1661	if (itpl->itpl_local_sa.sa_family == AF_INET &&
1662	itpl->itpl_remote_sa.sa_family == AF_INET) {
1663	inp = in_pcblookup_hash(pcbinfo,
1664	itpl->itpl_remote_sin.sin_addr,
1665	itpl->itpl_remote_sin.sin_port,
1666	itpl->itpl_local_sin.sin_addr,
1667	itpl->itpl_local_sin.sin_port,
1668	`0`, NULL);
1669	} else if (itpl->itpl_local_sa.sa_family == AF_INET6 &&
1670	itpl->itpl_remote_sa.sa_family == AF_INET6) {
1671	struct in6_addr ina6_local;
1672	struct in6_addr ina6_remote;
1673
1674	ina6_local = itpl->itpl_local_sin6.sin6_addr;
1675	if (IN6_IS_SCOPE_LINKLOCAL(&ina6_local) &&
1676	itpl->itpl_local_sin6.sin6_scope_id)
1677	ina6_local.s6_addr16[`1`] = htons(itpl->itpl_local_sin6.sin6_scope_id);
1678
1679	ina6_remote = itpl->itpl_remote_sin6.sin6_addr;
1680	if (IN6_IS_SCOPE_LINKLOCAL(&ina6_remote) &&
1681	itpl->itpl_remote_sin6.sin6_scope_id)
1682	ina6_remote.s6_addr16[`1`] = htons(itpl->itpl_remote_sin6.sin6_scope_id);
1683
1684	inp = in6_pcblookup_hash(pcbinfo,
1685	&ina6_remote,
1686	itpl->itpl_remote_sin6.sin6_port,
1687	&ina6_local,
1688	itpl->itpl_local_sin6.sin6_port,
1689	`0`, NULL);
1690	} else {
1691	return EINVAL;
1692	}
1693	if (inp == NULL \|\| (so = inp->inp_socket) == NULL)
1694	return ENOENT;
1695
1696	socket_lock(so, `0`);
1697	if (in_pcb_checkstate(inp, WNT_RELEASE, `1`) == WNT_STOPUSING) {
1698	socket_unlock(so, `0`);
1699	return ENOENT;
1700	}
1701	tp = intotcpcb(inp);
1702
1703	tcp_fill_info(tp, ti);
1704	socket_unlock(so, `0`);
1705
1706	return `0`;
1707	}
1708
1709	static void
1710	tcp_connection_fill_info(struct tcpcb tp, struct* tcp_connection_info *tci)
1711	{
1712	struct inpcb *inp = tp->t_inpcb;
1713
1714	bzero(tci, sizeof(*tci));
1715	tci->tcpi_state = tp->t_state;
1716	if (tp->t_state > TCPS_LISTEN) {
1717	if (TSTMP_SUPPORTED(tp))
1718	tci->tcpi_options \|= TCPCI_OPT_TIMESTAMPS;
1719	if (SACK_ENABLED(tp))
1720	tci->tcpi_options \|= TCPCI_OPT_SACK;
1721	if (TCP_WINDOW_SCALE_ENABLED(tp)) {
1722	tci->tcpi_options \|= TCPCI_OPT_WSCALE;
1723	tci->tcpi_snd_wscale = tp->snd_scale;
1724	tci->tcpi_rcv_wscale = tp->rcv_scale;
1725	}
1726	if (TCP_ECN_ENABLED(tp))
1727	tci->tcpi_options \|= TCPCI_OPT_ECN;
1728	if (IN_FASTRECOVERY(tp) \|\| tp->t_rxtshift > `0`)
1729	tci->tcpi_flags \|= TCPCI_FLAG_LOSSRECOVERY;
1730	if (tp->t_flagsext & TF_PKTS_REORDERED)
1731	tci->tcpi_flags \|= TCPCI_FLAG_REORDERING_DETECTED;
1732	tci->tcpi_rto = (tp->t_timer[TCPT_REXMT] > `0`) ?
1733	tp->t_rxtcur : `0`;
1734	tci->tcpi_maxseg = tp->t_maxseg;
1735	tci->tcpi_snd_ssthresh = tp->snd_ssthresh;
1736	tci->tcpi_snd_cwnd = tp->snd_cwnd;
1737	tci->tcpi_snd_wnd = tp->snd_wnd;
1738	tci->tcpi_snd_sbbytes = inp->inp_socket->so_snd.sb_cc;
1739	tci->tcpi_rcv_wnd = tp->rcv_wnd;
1740	tci->tcpi_rttcur = tp->t_rttcur;
1741	tci->tcpi_srtt = (tp->t_srtt >> TCP_RTT_SHIFT);
1742	tci->tcpi_rttvar = (tp->t_rttvar >> TCP_RTTVAR_SHIFT);
1743	tci->tcpi_txpackets = inp->inp_stat->txpackets;
1744	tci->tcpi_txbytes = inp->inp_stat->txbytes;
1745	tci->tcpi_txretransmitbytes = tp->t_stat.txretransmitbytes;
1746	tci->tcpi_txretransmitpackets = tp->t_stat.rxmitpkts;
1747	tci->tcpi_rxpackets = inp->inp_stat->rxpackets;
1748	tci->tcpi_rxbytes = inp->inp_stat->rxbytes;
1749	tci->tcpi_rxoutoforderbytes = tp->t_stat.rxoutoforderbytes;
1750
1751	tci->tcpi_tfo_syn_data_rcv = !!(tp->t_tfo_stats & TFO_S_SYNDATA_RCV);
1752	tci->tcpi_tfo_cookie_req_rcv = !!(tp->t_tfo_stats & TFO_S_COOKIEREQ_RECV);
1753	tci->tcpi_tfo_cookie_sent = !!(tp->t_tfo_stats & TFO_S_COOKIE_SENT);
1754	tci->tcpi_tfo_cookie_invalid = !!(tp->t_tfo_stats & TFO_S_COOKIE_INVALID);
1755	tci->tcpi_tfo_cookie_req = !!(tp->t_tfo_stats & TFO_S_COOKIE_REQ);
1756	tci->tcpi_tfo_cookie_rcv = !!(tp->t_tfo_stats & TFO_S_COOKIE_RCV);
1757	tci->tcpi_tfo_syn_data_sent = !!(tp->t_tfo_stats & TFO_S_SYN_DATA_SENT);
1758	tci->tcpi_tfo_syn_data_acked = !!(tp->t_tfo_stats & TFO_S_SYN_DATA_ACKED);
1759	tci->tcpi_tfo_syn_loss = !!(tp->t_tfo_stats & TFO_S_SYN_LOSS);
1760	tci->tcpi_tfo_cookie_wrong = !!(tp->t_tfo_stats & TFO_S_COOKIE_WRONG);
1761	tci->tcpi_tfo_no_cookie_rcv = !!(tp->t_tfo_stats & TFO_S_NO_COOKIE_RCV);
1762	tci->tcpi_tfo_heuristics_disable = !!(tp->t_tfo_stats & TFO_S_HEURISTICS_DISABLE);
1763	tci->tcpi_tfo_send_blackhole = !!(tp->t_tfo_stats & TFO_S_SEND_BLACKHOLE);
1764	tci->tcpi_tfo_recv_blackhole = !!(tp->t_tfo_stats & TFO_S_RECV_BLACKHOLE);
1765	tci->tcpi_tfo_onebyte_proxy = !!(tp->t_tfo_stats & TFO_S_ONE_BYTE_PROXY);
1766	}
1767	}
1768
1769
1770	__private_extern__ int
1771	tcp_sysctl_info(__unused struct sysctl_oid oidp, __unused void* arg1, __unused int* arg2, struct sysctl_req *req)
1772	{
1773	int error;
1774	struct tcp_info ti = {};
1775	struct info_tuple itpl;
1776	#if !CONFIG_EMBEDDED
1777	proc_t caller = PROC_NULL;
1778	proc_t caller_parent = PROC_NULL;
1779	char command_name[MAXCOMLEN + `1`] = "";
1780	char parent_name[MAXCOMLEN + `1`] = "";
1781
1782	if ((caller = proc_self()) != PROC_NULL) {
1783	/ get process name /
1784	strlcpy(command_name, caller->p_comm, sizeof(command_name));
1785
1786	/ get parent process name if possible /
1787	if ((caller_parent = proc_find(caller->p_ppid)) != PROC_NULL) {
1788	strlcpy(parent_name, caller_parent->p_comm,
1789	sizeof(parent_name));
1790	proc_rele(caller_parent);
1791	}
1792
1793	if ((escape_str(command_name, strlen(command_name) + `1`,
1794	sizeof(command_name)) == `0`) &&
1795	(escape_str(parent_name, strlen(parent_name) + `1`,
1796	sizeof(parent_name)) == `0`)) {
1797	kern_asl_msg(LOG_DEBUG, "messagetracer",
1798	`5`,
1799	"com.apple.message.domain",
1800	"com.apple.kernel.tcpstat", / 1 /
1801	"com.apple.message.signature",
1802	"tcpinfo", / 2 /
1803	"com.apple.message.signature2", command_name, / 3 /
1804	"com.apple.message.signature3", parent_name, / 4 /
1805	"com.apple.message.summarize", "YES", / 5 /
1806	NULL);
1807	}
1808	}
1809
1810	if (caller != PROC_NULL)
1811	proc_rele(caller);
1812	#endif /* !CONFIG_EMBEDDED */
1813
1814	if (req->newptr == USER_ADDR_NULL) {
1815	return EINVAL;
1816	}
1817	if (req->newlen < sizeof(struct info_tuple)) {
1818	return EINVAL;
1819	}
1820	error = SYSCTL_IN(req, &itpl, sizeof(struct info_tuple));
1821	if (error != `0`) {
1822	return error;
1823	}
1824	error = tcp_fill_info_for_info_tuple(&itpl, &ti);
1825	if (error != `0`) {
1826	return error;
1827	}
1828	error = SYSCTL_OUT(req, &ti, sizeof(struct tcp_info));
1829	if (error != `0`) {
1830	return error;
1831	}
1832
1833	return `0`;
1834	}
1835
1836	static int
1837	tcp_lookup_peer_pid_locked(struct socket so, pid_t out_pid)
1838	{
1839	int error = EHOSTUNREACH;
1840	*out_pid = -`1`;
1841	if ((so->so_state & SS_ISCONNECTED) == `0`) return ENOTCONN;
1842
1843	struct inpcb inp = (struct* inpcb*)so->so_pcb;
1844	uint16_t lport = inp->inp_lport;
1845	uint16_t fport = inp->inp_fport;
1846	struct inpcb *finp = NULL;
1847	struct in6_addr laddr6, faddr6;
1848	struct in_addr laddr4, faddr4;
1849
1850	if (inp->inp_vflag & INP_IPV6) {
1851	laddr6 = inp->in6p_laddr;
1852	faddr6 = inp->in6p_faddr;
1853	} else if (inp->inp_vflag & INP_IPV4) {
1854	laddr4 = inp->inp_laddr;
1855	faddr4 = inp->inp_faddr;
1856	}
1857
1858	socket_unlock(so, `0`);
1859	if (inp->inp_vflag & INP_IPV6) {
1860	finp = in6_pcblookup_hash(&tcbinfo, &laddr6, lport, &faddr6, fport, `0`, NULL);
1861	} else if (inp->inp_vflag & INP_IPV4) {
1862	finp = in_pcblookup_hash(&tcbinfo, laddr4, lport, faddr4, fport, `0`, NULL);
1863	}
1864
1865	if (finp) {
1866	*out_pid = finp->inp_socket->last_pid;
1867	error = `0`;
1868	in_pcb_checkstate(finp, WNT_RELEASE, `0`);
1869	}
1870	socket_lock(so, `0`);
1871
1872	return error;
1873	}
1874
1875	void
1876	tcp_getconninfo(struct socket so, struct* conninfo_tcp *tcp_ci)
1877	{
1878	(void) tcp_lookup_peer_pid_locked(so, &tcp_ci->tcpci_peer_pid);
1879	tcp_fill_info(sototcpcb(so), &tcp_ci->tcpci_tcp_info);
1880	}
1881
1882	/*
1883	* The new sockopt interface makes it possible for us to block in the
1884	* copyin/out step (if we take a page fault). Taking a page fault at
1885	* splnet() is probably a Bad Thing. (Since sockets and pcbs both now
1886	* use TSM, there probably isn't any need for this function to run at
1887	* splnet() any more. This needs more examination.)
1888	*/
1889	int
1890	tcp_ctloutput(struct socket so, struct* sockopt *sopt)
1891	{
1892	int error = `0`, opt = `0`, optval = `0`;
1893	struct inpcb *inp;
1894	struct tcpcb *tp;
1895
1896	inp = sotoinpcb(so);
1897	if (inp == NULL) {
1898	return (ECONNRESET);
1899	}
1900	/ Allow <SOL_SOCKET,SO_FLUSH/SO_TRAFFIC_MGT_BACKGROUND> at this level /
1901	if (sopt->sopt_level != IPPROTO_TCP &&
1902	!(sopt->sopt_level == SOL_SOCKET && (sopt->sopt_name == SO_FLUSH \|\|
1903	sopt->sopt_name == SO_TRAFFIC_MGT_BACKGROUND))) {
1904	#if INET6
1905	if (SOCK_CHECK_DOM(so, PF_INET6))
1906	error = ip6_ctloutput(so, sopt);
1907	else
1908	#endif /* INET6 */
1909	error = ip_ctloutput(so, sopt);
1910	return (error);
1911	}
1912	tp = intotcpcb(inp);
1913	if (tp == NULL) {
1914	return (ECONNRESET);
1915	}
1916
1917	calculate_tcp_clock();
1918
1919	switch (sopt->sopt_dir) {
1920	case SOPT_SET:
1921	switch (sopt->sopt_name) {
1922	case TCP_NODELAY:
1923	case TCP_NOOPT:
1924	case TCP_NOPUSH:
1925	error = sooptcopyin(sopt, &optval, sizeof optval,
1926	sizeof optval);
1927	if (error)
1928	break;
1929
1930	switch (sopt->sopt_name) {
1931	case TCP_NODELAY:
1932	opt = TF_NODELAY;
1933	break;
1934	case TCP_NOOPT:
1935	opt = TF_NOOPT;
1936	break;
1937	case TCP_NOPUSH:
1938	opt = TF_NOPUSH;
1939	break;
1940	default:
1941	opt = `0`; / dead code to fool gcc /
1942	break;
1943	}
1944
1945	if (optval)
1946	tp->t_flags \|= opt;
1947	else
1948	tp->t_flags &= ~opt;
1949	break;
1950	case TCP_RXT_FINDROP:
1951	case TCP_NOTIMEWAIT:
1952	error = sooptcopyin(sopt, &optval, sizeof optval,
1953	sizeof optval);
1954	if (error)
1955	break;
1956	switch (sopt->sopt_name) {
1957	case TCP_RXT_FINDROP:
1958	opt = TF_RXTFINDROP;
1959	break;
1960	case TCP_NOTIMEWAIT:
1961	opt = TF_NOTIMEWAIT;
1962	break;
1963	default:
1964	opt = `0`;
1965	break;
1966	}
1967	if (optval)
1968	tp->t_flagsext \|= opt;
1969	else
1970	tp->t_flagsext &= ~opt;
1971	break;
1972	case TCP_MEASURE_SND_BW:
1973	error = sooptcopyin(sopt, &optval, sizeof optval,
1974	sizeof optval);
1975	if (error)
1976	break;
1977	opt = TF_MEASURESNDBW;
1978	if (optval) {
1979	if (tp->t_bwmeas == NULL) {
1980	tp->t_bwmeas = tcp_bwmeas_alloc(tp);
1981	if (tp->t_bwmeas == NULL) {
1982	error = ENOMEM;
1983	break;
1984	}
1985	}
1986	tp->t_flagsext \|= opt;
1987	} else {
1988	tp->t_flagsext &= ~opt;
1989	/ Reset snd bw measurement state /
1990	tp->t_flagsext &= ~(TF_BWMEAS_INPROGRESS);
1991	if (tp->t_bwmeas != NULL) {
1992	tcp_bwmeas_free(tp);
1993	}
1994	}
1995	break;
1996	case TCP_MEASURE_BW_BURST: {
1997	struct tcp_measure_bw_burst in;
1998	uint32_t minpkts, maxpkts;
1999	bzero(&in, sizeof(in));
2000
2001	error = sooptcopyin(sopt, &in, sizeof(in),
2002	sizeof(in));
2003	if (error)
2004	break;
2005	if ((tp->t_flagsext & TF_MEASURESNDBW) == `0` \|\|
2006	tp->t_bwmeas == NULL) {
2007	error = EINVAL;
2008	break;
2009	}
2010	minpkts = (in.min_burst_size != `0`) ? in.min_burst_size :
2011	tp->t_bwmeas->bw_minsizepkts;
2012	maxpkts = (in.max_burst_size != `0`) ? in.max_burst_size :
2013	tp->t_bwmeas->bw_maxsizepkts;
2014	if (minpkts > maxpkts) {
2015	error = EINVAL;
2016	break;
2017	}
2018	tp->t_bwmeas->bw_minsizepkts = minpkts;
2019	tp->t_bwmeas->bw_maxsizepkts = maxpkts;
2020	tp->t_bwmeas->bw_minsize = (minpkts * tp->t_maxseg);
2021	tp->t_bwmeas->bw_maxsize = (maxpkts * tp->t_maxseg);
2022	break;
2023	}
2024	case TCP_MAXSEG:
2025	error = sooptcopyin(sopt, &optval, sizeof optval,
2026	sizeof optval);
2027	if (error)
2028	break;
2029
2030	if (optval > `0` && optval <= tp->t_maxseg &&
2031	optval + `40` >= tcp_minmss)
2032	tp->t_maxseg = optval;
2033	else
2034	error = EINVAL;
2035	break;
2036
2037	case TCP_KEEPALIVE:
2038	error = sooptcopyin(sopt, &optval, sizeof optval,
2039	sizeof optval);
2040	if (error)
2041	break;
2042	if (optval < `0` \|\| optval > UINT32_MAX/TCP_RETRANSHZ) {
2043	error = EINVAL;
2044	} else {
2045	tp->t_keepidle = optval * TCP_RETRANSHZ;
2046	/ reset the timer to new value /
2047	tp->t_timer[TCPT_KEEP] = OFFSET_FROM_START(tp,
2048	TCP_CONN_KEEPIDLE(tp));
2049	tcp_check_timer_state(tp);
2050	}
2051	break;
2052
2053	case TCP_CONNECTIONTIMEOUT:
2054	error = sooptcopyin(sopt, &optval, sizeof optval,
2055	sizeof optval);
2056	if (error)
2057	break;
2058	if (optval < `0` \|\| optval > UINT32_MAX/TCP_RETRANSHZ) {
2059	error = EINVAL;
2060	} else {
2061	tp->t_keepinit = optval * TCP_RETRANSHZ;
2062	if (tp->t_state == TCPS_SYN_RECEIVED \|\|
2063	tp->t_state == TCPS_SYN_SENT) {
2064	tp->t_timer[TCPT_KEEP] = OFFSET_FROM_START(tp,
2065	TCP_CONN_KEEPINIT(tp));
2066	tcp_check_timer_state(tp);
2067	}
2068	}
2069	break;
2070
2071	case TCP_KEEPINTVL:
2072	error = sooptcopyin(sopt, &optval, sizeof(optval),
2073	sizeof(optval));
2074	if (error)
2075	break;
2076	if (optval < `0` \|\| optval > UINT32_MAX/TCP_RETRANSHZ) {
2077	error = EINVAL;
2078	} else {
2079	tp->t_keepintvl = optval * TCP_RETRANSHZ;
2080	if (tp->t_state == TCPS_FIN_WAIT_2 &&
2081	TCP_CONN_MAXIDLE(tp) > `0`) {
2082	tp->t_timer[TCPT_2MSL] = OFFSET_FROM_START(tp,
2083	TCP_CONN_MAXIDLE(tp));
2084	tcp_check_timer_state(tp);
2085	}
2086	}
2087	break;
2088
2089	case TCP_KEEPCNT:
2090	error = sooptcopyin(sopt, &optval, sizeof(optval),
2091	sizeof(optval));
2092	if (error)
2093	break;
2094	if (optval < `0` \|\| optval > INT32_MAX) {
2095	error = EINVAL;
2096	} else {
2097	tp->t_keepcnt = optval;
2098	if (tp->t_state == TCPS_FIN_WAIT_2 &&
2099	TCP_CONN_MAXIDLE(tp) > `0`) {
2100	tp->t_timer[TCPT_2MSL] = OFFSET_FROM_START(tp,
2101	TCP_CONN_MAXIDLE(tp));
2102	tcp_check_timer_state(tp);
2103	}
2104	}
2105	break;
2106
2107	case TCP_KEEPALIVE_OFFLOAD:
2108	error = sooptcopyin(sopt, &optval, sizeof(optval),
2109	sizeof(optval));
2110	if (error)
2111	break;
2112	if (optval < `0` \|\| optval > INT32_MAX) {
2113	error = EINVAL;
2114	break;
2115	}
2116	if (optval != `0`)
2117	inp->inp_flags2 \|= INP2_KEEPALIVE_OFFLOAD;
2118	else
2119	inp->inp_flags2 &= ~INP2_KEEPALIVE_OFFLOAD;
2120	break;
2121
2122	case PERSIST_TIMEOUT:
2123	error = sooptcopyin(sopt, &optval, sizeof optval,
2124	sizeof optval);
2125	if (error)
2126	break;
2127	if (optval < `0`)
2128	error = EINVAL;
2129	else
2130	tp->t_persist_timeout = optval * TCP_RETRANSHZ;
2131	break;
2132	case TCP_RXT_CONNDROPTIME:
2133	error = sooptcopyin(sopt, &optval, sizeof(optval),
2134	sizeof(optval));
2135	if (error)
2136	break;
2137	if (optval < `0`)
2138	error = EINVAL;
2139	else
2140	tp->t_rxt_conndroptime = optval * TCP_RETRANSHZ;
2141	break;
2142	case TCP_NOTSENT_LOWAT:
2143	error = sooptcopyin(sopt, &optval, sizeof(optval),
2144	sizeof(optval));
2145	if (error)
2146	break;
2147	if (optval < `0`) {
2148	error = EINVAL;
2149	break;
2150	} else {
2151	if (optval == `0`) {
2152	so->so_flags &= ~(SOF_NOTSENT_LOWAT);
2153	tp->t_notsent_lowat = `0`;
2154	} else {
2155	so->so_flags \|= SOF_NOTSENT_LOWAT;
2156	tp->t_notsent_lowat = optval;
2157	}
2158	}
2159	break;
2160	case TCP_ADAPTIVE_READ_TIMEOUT:
2161	error = sooptcopyin(sopt, &optval, sizeof (optval),
2162	sizeof(optval));
2163	if (error)
2164	break;
2165	if (optval < `0` \|\|
2166	optval > TCP_ADAPTIVE_TIMEOUT_MAX) {
2167	error = EINVAL;
2168	break;
2169	} else if (optval == `0`) {
2170	tp->t_adaptive_rtimo = `0`;
2171	tcp_keepalive_reset(tp);
2172
2173	if (tp->t_mpsub)
2174	mptcp_reset_keepalive(tp);
2175	} else {
2176	tp->t_adaptive_rtimo = optval;
2177	}
2178	break;
2179	case TCP_ADAPTIVE_WRITE_TIMEOUT:
2180	error = sooptcopyin(sopt, &optval, sizeof (optval),
2181	sizeof (optval));
2182	if (error)
2183	break;
2184	if (optval < `0` \|\|
2185	optval > TCP_ADAPTIVE_TIMEOUT_MAX) {
2186	error = EINVAL;
2187	break;
2188	} else {
2189	tp->t_adaptive_wtimo = optval;
2190	}
2191	break;
2192	case TCP_ENABLE_MSGS:
2193	error = sooptcopyin(sopt, &optval, sizeof(optval),
2194	sizeof(optval));
2195	if (error)
2196	break;
2197	if (optval < `0` \|\| optval > `1`) {
2198	error = EINVAL;
2199	} else if (optval == `1`) {
2200	/*
2201	* Check if messages option is already
2202	* enabled, if so return.
2203	*/
2204	if (so->so_flags & SOF_ENABLE_MSGS) {
2205	VERIFY(so->so_msg_state != NULL);
2206	break;
2207	}
2208
2209	/*
2210	* allocate memory for storing message
2211	* related state
2212	*/
2213	VERIFY(so->so_msg_state == NULL);
2214	MALLOC(so->so_msg_state,
2215	struct msg_state *,
2216	sizeof(struct msg_state),
2217	M_TEMP, M_WAITOK \| M_ZERO);
2218	if (so->so_msg_state == NULL) {
2219	error = ENOMEM;
2220	break;
2221	}
2222
2223	/ Enable message delivery /
2224	so->so_flags \|= SOF_ENABLE_MSGS;
2225	} else {
2226	/*
2227	* Can't disable message delivery on socket
2228	* because of restrictions imposed by
2229	* encoding/decoding
2230	*/
2231	error = EINVAL;
2232	}
2233	break;
2234	case TCP_SENDMOREACKS:
2235	error = sooptcopyin(sopt, &optval, sizeof(optval),
2236	sizeof(optval));
2237	if (error)
2238	break;
2239	if (optval < `0` \|\| optval > `1`) {
2240	error = EINVAL;
2241	} else if (optval == `0`) {
2242	tp->t_flagsext &= ~(TF_NOSTRETCHACK);
2243	} else {
2244	tp->t_flagsext \|= TF_NOSTRETCHACK;
2245	}
2246	break;
2247	case TCP_DISABLE_BLACKHOLE_DETECTION:
2248	error = sooptcopyin(sopt, &optval, sizeof(optval),
2249	sizeof(optval));
2250	if (error)
2251	break;
2252	if (optval < `0` \|\| optval > `1`) {
2253	error = EINVAL;
2254	} else if (optval == `0`) {
2255	tp->t_flagsext &= ~TF_NOBLACKHOLE_DETECTION;
2256	} else {
2257	tp->t_flagsext \|= TF_NOBLACKHOLE_DETECTION;
2258	if ((tp->t_flags & TF_BLACKHOLE) &&
2259	tp->t_pmtud_saved_maxopd > `0`)
2260	tcp_pmtud_revert_segment_size(tp);
2261	}
2262	break;
2263	case TCP_FASTOPEN:
2264	if (!(tcp_fastopen & TCP_FASTOPEN_SERVER)) {
2265	error = ENOTSUP;
2266	break;
2267	}
2268
2269	error = sooptcopyin(sopt, &optval, sizeof(optval),
2270	sizeof(optval));
2271	if (error)
2272	break;
2273	if (optval < `0` \|\| optval > `1`) {
2274	error = EINVAL;
2275	break;
2276	}
2277	if (tp->t_state != TCPS_LISTEN) {
2278	error = EINVAL;
2279	break;
2280	}
2281	if (optval)
2282	tp->t_flagsext \|= TF_FASTOPEN;
2283	else
2284	tcp_disable_tfo(tp);
2285	break;
2286	case TCP_FASTOPEN_FORCE_HEURISTICS:
2287	error = sooptcopyin(sopt, &optval, sizeof(optval),
2288	sizeof(optval));
2289
2290	if (error)
2291	break;
2292	if (optval < `0` \|\| optval > `1`) {
2293	error = EINVAL;
2294	break;
2295	}
2296
2297	if (tp->t_state != TCPS_CLOSED) {
2298	error = EINVAL;
2299	break;
2300	}
2301	if (optval)
2302	tp->t_flagsext \|= TF_FASTOPEN_HEUR;
2303	else
2304	tp->t_flagsext &= ~TF_FASTOPEN_HEUR;
2305
2306	break;
2307	case TCP_ENABLE_ECN:
2308	error = sooptcopyin(sopt, &optval, sizeof optval,
2309	sizeof optval);
2310	if (error)
2311	break;
2312	if (optval) {
2313	tp->ecn_flags \|= TE_ECN_MODE_ENABLE;
2314	tp->ecn_flags &= ~TE_ECN_MODE_DISABLE;
2315	} else {
2316	tp->ecn_flags &= ~TE_ECN_MODE_ENABLE;
2317	tp->ecn_flags \|= TE_ECN_MODE_DISABLE;
2318	}
2319	break;
2320	case TCP_ECN_MODE:
2321	error = sooptcopyin(sopt, &optval, sizeof optval,
2322	sizeof optval);
2323	if (error)
2324	break;
2325	if (optval == ECN_MODE_DEFAULT) {
2326	tp->ecn_flags &= ~TE_ECN_MODE_ENABLE;
2327	tp->ecn_flags &= ~TE_ECN_MODE_DISABLE;
2328	} else if (optval == ECN_MODE_ENABLE) {
2329	tp->ecn_flags \|= TE_ECN_MODE_ENABLE;
2330	tp->ecn_flags &= ~TE_ECN_MODE_DISABLE;
2331	} else if (optval == ECN_MODE_DISABLE) {
2332	tp->ecn_flags &= ~TE_ECN_MODE_ENABLE;
2333	tp->ecn_flags \|= TE_ECN_MODE_DISABLE;
2334	} else {
2335	error = EINVAL;
2336	}
2337	break;
2338	case TCP_NOTIFY_ACKNOWLEDGEMENT:
2339	error = sooptcopyin(sopt, &optval,
2340	sizeof(optval), sizeof(optval));
2341	if (error)
2342	break;
2343	if (optval <= `0`) {
2344	error = EINVAL;
2345	break;
2346	}
2347	if (tp->t_notify_ack_count >= TCP_MAX_NOTIFY_ACK) {
2348	error = ETOOMANYREFS;
2349	break;
2350	}
2351
2352	/*
2353	* validate that the given marker id is not
2354	* a duplicate to avoid ambiguity
2355	*/
2356	if ((error = tcp_notify_ack_id_valid(tp, so,
2357	optval)) != `0`) {
2358	break;
2359	}
2360	error = tcp_add_notify_ack_marker(tp, optval);
2361	break;
2362	case SO_FLUSH:
2363	if ((error = sooptcopyin(sopt, &optval, sizeof (optval),
2364	sizeof (optval))) != `0`)
2365	break;
2366
2367	error = inp_flush(inp, optval);
2368	break;
2369
2370	case SO_TRAFFIC_MGT_BACKGROUND:
2371	if ((error = sooptcopyin(sopt, &optval, sizeof (optval),
2372	sizeof (optval))) != `0`)
2373	break;
2374
2375	if (optval) {
2376	socket_set_traffic_mgt_flags_locked(so,
2377	TRAFFIC_MGT_SO_BACKGROUND);
2378	} else {
2379	socket_clear_traffic_mgt_flags_locked(so,
2380	TRAFFIC_MGT_SO_BACKGROUND);
2381	}
2382	break;
2383	case TCP_RXT_MINIMUM_TIMEOUT:
2384	error = sooptcopyin(sopt, &optval, sizeof(optval),
2385	sizeof(optval));
2386	if (error)
2387	break;
2388	if (optval < `0`) {
2389	error = EINVAL;
2390	break;
2391	}
2392	if (optval == `0`) {
2393	tp->t_rxt_minimum_timeout = `0`;
2394	} else {
2395	tp->t_rxt_minimum_timeout = min(optval,
2396	TCP_RXT_MINIMUM_TIMEOUT_LIMIT);
2397	/ convert to milliseconds /
2398	tp->t_rxt_minimum_timeout *= TCP_RETRANSHZ;
2399	}
2400	break;
2401	default:
2402	error = ENOPROTOOPT;
2403	break;
2404	}
2405	break;
2406
2407	case SOPT_GET:
2408	switch (sopt->sopt_name) {
2409	case TCP_NODELAY:
2410	optval = tp->t_flags & TF_NODELAY;
2411	break;
2412	case TCP_MAXSEG:
2413	optval = tp->t_maxseg;
2414	break;
2415	case TCP_KEEPALIVE:
2416	if (tp->t_keepidle > `0`)
2417	optval = tp->t_keepidle / TCP_RETRANSHZ;
2418	else
2419	optval = tcp_keepidle / TCP_RETRANSHZ;
2420	break;
2421	case TCP_KEEPINTVL:
2422	if (tp->t_keepintvl > `0`)
2423	optval = tp->t_keepintvl / TCP_RETRANSHZ;
2424	else
2425	optval = tcp_keepintvl / TCP_RETRANSHZ;
2426	break;
2427	case TCP_KEEPCNT:
2428	if (tp->t_keepcnt > `0`)
2429	optval = tp->t_keepcnt;
2430	else
2431	optval = tcp_keepcnt;
2432	break;
2433	case TCP_KEEPALIVE_OFFLOAD:
2434	optval = !!(inp->inp_flags2 & INP2_KEEPALIVE_OFFLOAD);
2435	break;
2436	case TCP_NOOPT:
2437	optval = tp->t_flags & TF_NOOPT;
2438	break;
2439	case TCP_NOPUSH:
2440	optval = tp->t_flags & TF_NOPUSH;
2441	break;
2442	case TCP_ENABLE_ECN:
2443	optval = (tp->ecn_flags & TE_ECN_MODE_ENABLE) ? `1` : `0`;
2444	break;
2445	case TCP_ECN_MODE:
2446	if (tp->ecn_flags & TE_ECN_MODE_ENABLE)
2447	optval = ECN_MODE_ENABLE;
2448	else if (tp->ecn_flags & TE_ECN_MODE_DISABLE)
2449	optval = ECN_MODE_DISABLE;
2450	else
2451	optval = ECN_MODE_DEFAULT;
2452	break;
2453	case TCP_CONNECTIONTIMEOUT:
2454	optval = tp->t_keepinit / TCP_RETRANSHZ;
2455	break;
2456	case PERSIST_TIMEOUT:
2457	optval = tp->t_persist_timeout / TCP_RETRANSHZ;
2458	break;
2459	case TCP_RXT_CONNDROPTIME:
2460	optval = tp->t_rxt_conndroptime / TCP_RETRANSHZ;
2461	break;
2462	case TCP_RXT_FINDROP:
2463	optval = tp->t_flagsext & TF_RXTFINDROP;
2464	break;
2465	case TCP_NOTIMEWAIT:
2466	optval = (tp->t_flagsext & TF_NOTIMEWAIT) ? `1` : `0`;
2467	break;
2468	case TCP_FASTOPEN:
2469	if (tp->t_state != TCPS_LISTEN \|\|
2470	!(tcp_fastopen & TCP_FASTOPEN_SERVER)) {
2471	error = ENOTSUP;
2472	break;
2473	}
2474	optval = tfo_enabled(tp);
2475	break;
2476	case TCP_FASTOPEN_FORCE_HEURISTICS:
2477	optval = (tp->t_flagsext & TF_FASTOPEN_HEUR) ? `1` : `0`;
2478	break;
2479	case TCP_MEASURE_SND_BW:
2480	optval = tp->t_flagsext & TF_MEASURESNDBW;
2481	break;
2482	case TCP_INFO: {
2483	struct tcp_info ti;
2484
2485	tcp_fill_info(tp, &ti);
2486	error = sooptcopyout(sopt, &ti, sizeof(struct tcp_info));
2487	goto done;
2488	/ NOT REACHED /
2489	}
2490	case TCP_CONNECTION_INFO: {
2491	struct tcp_connection_info tci;
2492	tcp_connection_fill_info(tp, &tci);
2493	error = sooptcopyout(sopt, &tci,
2494	sizeof(struct tcp_connection_info));
2495	goto done;
2496	}
2497	case TCP_MEASURE_BW_BURST: {
2498	struct tcp_measure_bw_burst out = {};
2499	if ((tp->t_flagsext & TF_MEASURESNDBW) == `0` \|\|
2500	tp->t_bwmeas == NULL) {
2501	error = EINVAL;
2502	break;
2503	}
2504	out.min_burst_size = tp->t_bwmeas->bw_minsizepkts;
2505	out.max_burst_size = tp->t_bwmeas->bw_maxsizepkts;
2506	error = sooptcopyout(sopt, &out, sizeof(out));
2507	goto done;
2508	}
2509	case TCP_NOTSENT_LOWAT:
2510	if ((so->so_flags & SOF_NOTSENT_LOWAT) != `0`) {
2511	optval = tp->t_notsent_lowat;
2512	} else {
2513	optval = `0`;
2514	}
2515	break;
2516
2517	case TCP_ENABLE_MSGS:
2518	if (so->so_flags & SOF_ENABLE_MSGS) {
2519	optval = `1`;
2520	} else {
2521	optval = `0`;
2522	}
2523	break;
2524	case TCP_SENDMOREACKS:
2525	if (tp->t_flagsext & TF_NOSTRETCHACK)
2526	optval = `1`;
2527	else
2528	optval = `0`;
2529	break;
2530	case TCP_DISABLE_BLACKHOLE_DETECTION:
2531	if (tp->t_flagsext & TF_NOBLACKHOLE_DETECTION)
2532	optval = `1`;
2533	else
2534	optval = `0`;
2535	break;
2536	case TCP_PEER_PID: {
2537	pid_t pid;
2538	error = tcp_lookup_peer_pid_locked(so, &pid);
2539	if (error == `0`)
2540	error = sooptcopyout(sopt, &pid, sizeof(pid));
2541	goto done;
2542	}
2543	case TCP_ADAPTIVE_READ_TIMEOUT:
2544	optval = tp->t_adaptive_rtimo;
2545	break;
2546	case TCP_ADAPTIVE_WRITE_TIMEOUT:
2547	optval = tp->t_adaptive_wtimo;
2548	break;
2549	case SO_TRAFFIC_MGT_BACKGROUND:
2550	optval = (so->so_flags1 &
2551	SOF1_TRAFFIC_MGT_SO_BACKGROUND) ? `1` : `0`;
2552	break;
2553	case TCP_NOTIFY_ACKNOWLEDGEMENT: {
2554	struct tcp_notify_ack_complete retid;
2555
2556	if (sopt->sopt_valsize != sizeof (retid)) {
2557	error = EINVAL;
2558	break;
2559	}
2560	bzero(&retid, sizeof (retid));
2561	tcp_get_notify_ack_count(tp, &retid);
2562	if (retid.notify_complete_count > `0`)
2563	tcp_get_notify_ack_ids(tp, &retid);
2564
2565	error = sooptcopyout(sopt, &retid, sizeof (retid));
2566	goto done;
2567	}
2568	case TCP_RXT_MINIMUM_TIMEOUT:
2569	optval = tp->t_rxt_minimum_timeout / TCP_RETRANSHZ;
2570	break;
2571	default:
2572	error = ENOPROTOOPT;
2573	break;
2574	}
2575	if (error == `0`)
2576	error = sooptcopyout(sopt, &optval, sizeof optval);
2577	break;
2578	}
2579	done:
2580	return (error);
2581	}
2582
2583	/*
2584	* tcp_sendspace and tcp_recvspace are the default send and receive window
2585	* sizes, respectively. These are obsolescent (this information should
2586	* be set by the route).
2587	*/
2588	u_int32_t tcp_sendspace = `1448`*`256`;
2589	u_int32_t tcp_recvspace = `1448`*`384`;
2590
2591	/ During attach, the size of socket buffer allocated is limited to*
2592	* sb_max in sbreserve. Disallow setting the tcp send and recv space
2593	* to be more than sb_max because that will cause tcp_attach to fail
2594	* (see radar 5713060)
2595	*/
2596	static int
2597	sysctl_tcp_sospace(struct sysctl_oid oidp, __unused void* *arg1,
2598	int arg2, struct sysctl_req *req)
2599	{
2600	#pragma unused(arg2)
2601	u_int32_t new_value = `0`, *space_p = NULL;
2602	int changed = `0`, error = `0`;
2603	u_quad_t sb_effective_max = (sb_max / (MSIZE+MCLBYTES)) * MCLBYTES;
2604
2605	switch (oidp->oid_number) {
2606	case TCPCTL_SENDSPACE:
2607	space_p = &tcp_sendspace;
2608	break;
2609	case TCPCTL_RECVSPACE:
2610	space_p = &tcp_recvspace;
2611	break;
2612	default:
2613	return EINVAL;
2614	}
2615	error = sysctl_io_number(req, space_p, sizeof*(u_int32_t),
2616	&new_value, &changed);
2617	if (changed) {
2618	if (new_value > `0` && new_value <= sb_effective_max) {
2619	*space_p = new_value;
2620	SYSCTL_SKMEM_UPDATE_AT_OFFSET(arg2, new_value);
2621	} else {
2622	error = ERANGE;
2623	}
2624	}
2625	return error;
2626	}
2627
2628	#if SYSCTL_SKMEM
2629	SYSCTL_PROC(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace,
2630	CTLTYPE_INT \| CTLFLAG_RW \| CTLFLAG_LOCKED, &tcp_sendspace,
2631	offsetof(skmem_sysctl, tcp.sendspace), sysctl_tcp_sospace,
2632	"IU", "Maximum outgoing TCP datagram size");
2633	SYSCTL_PROC(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace,
2634	CTLTYPE_INT \| CTLFLAG_RW \| CTLFLAG_LOCKED, &tcp_recvspace,
2635	offsetof(skmem_sysctl, tcp.recvspace), sysctl_tcp_sospace,
2636	"IU", "Maximum incoming TCP datagram size");
2637	#else /* SYSCTL_SKMEM */
2638	SYSCTL_PROC(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLTYPE_INT \| CTLFLAG_RW \| CTLFLAG_LOCKED,
2639	&tcp_sendspace , `0`, &sysctl_tcp_sospace, "IU", "Maximum outgoing TCP datagram size");
2640	SYSCTL_PROC(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLTYPE_INT \| CTLFLAG_RW \| CTLFLAG_LOCKED,
2641	&tcp_recvspace , `0`, &sysctl_tcp_sospace, "IU", "Maximum incoming TCP datagram size");
2642	#endif /* SYSCTL_SKMEM */
2643
2644	/*
2645	* Attach TCP protocol to socket, allocating
2646	* internet protocol control block, tcp control block,
2647	* bufer space, and entering LISTEN state if to accept connections.
2648	*
2649	* Returns: 0 Success
2650	* in_pcballoc:ENOBUFS
2651	* in_pcballoc:ENOMEM
2652	* in_pcballoc:??? [IPSEC specific]
2653	* soreserve:ENOBUFS
2654	*/
2655	static int
2656	tcp_attach(struct socket so, struct* proc *p)
2657	{
2658	struct tcpcb *tp;
2659	struct inpcb *inp;
2660	int error;
2661	#if INET6
2662	int isipv6 = SOCK_CHECK_DOM(so, PF_INET6) != `0`;
2663	#endif
2664
2665	error = in_pcballoc(so, &tcbinfo, p);
2666	if (error)
2667	return (error);
2668
2669	inp = sotoinpcb(so);
2670
2671	if (so->so_snd.sb_hiwat == `0` \|\| so->so_rcv.sb_hiwat == `0`) {
2672	error = soreserve(so, tcp_sendspace, tcp_recvspace);
2673	if (error)
2674	return (error);
2675	}
2676
2677	if (so->so_snd.sb_preconn_hiwat == `0`) {
2678	soreserve_preconnect(so, `2048`);
2679	}
2680
2681	if ((so->so_rcv.sb_flags & SB_USRSIZE) == `0`)
2682	so->so_rcv.sb_flags \|= SB_AUTOSIZE;
2683	if ((so->so_snd.sb_flags & SB_USRSIZE) == `0`)
2684	so->so_snd.sb_flags \|= SB_AUTOSIZE;
2685
2686	#if INET6
2687	if (isipv6) {
2688	inp->inp_vflag \|= INP_IPV6;
2689	inp->in6p_hops = -`1`; / use kernel default /
2690	}
2691	else
2692	#endif /* INET6 */
2693	inp->inp_vflag \|= INP_IPV4;
2694	tp = tcp_newtcpcb(inp);
2695	if (tp == NULL) {
2696	int nofd = so->so_state & SS_NOFDREF; / XXX /
2697
2698	so->so_state &= ~SS_NOFDREF; / don't free the socket yet /
2699	#if INET6
2700	if (isipv6)
2701	in6_pcbdetach(inp);
2702	else
2703	#endif /* INET6 */
2704	in_pcbdetach(inp);
2705	so->so_state \|= nofd;
2706	return (ENOBUFS);
2707	}
2708	if (nstat_collect)
2709	nstat_tcp_new_pcb(inp);
2710	tp->t_state = TCPS_CLOSED;
2711	return (`0`);
2712	}
2713
2714	/*
2715	* Initiate (or continue) disconnect.
2716	* If embryonic state, just send reset (once).
2717	* If in ``let data drain'' option and linger null, just drop.
2718	* Otherwise (hard), mark socket disconnecting and drop
2719	* current input data; switch states based on user close, and
2720	* send segment to peer (with FIN).
2721	*/
2722	static struct tcpcb *
2723	tcp_disconnect(struct tcpcb *tp)
2724	{
2725	struct socket *so = tp->t_inpcb->inp_socket;
2726
2727	if (so->so_rcv.sb_cc != `0` \|\| tp->t_reassqlen != `0`)
2728	return tcp_drop(tp, `0`);
2729
2730	if (tp->t_state < TCPS_ESTABLISHED)
2731	tp = tcp_close(tp);
2732	else if ((so->so_options & SO_LINGER) && so->so_linger == `0`)
2733	tp = tcp_drop(tp, `0`);
2734	else {
2735	soisdisconnecting(so);
2736	sbflush(&so->so_rcv);
2737	tp = tcp_usrclosed(tp);
2738	#if MPTCP
2739	/ A reset has been sent but socket exists, do not send FIN /
2740	if ((so->so_flags & SOF_MP_SUBFLOW) &&
2741	(tp) && (tp->t_mpflags & TMPF_RESET))
2742	return (tp);
2743	#endif
2744	if (tp)
2745	(void) tcp_output(tp);
2746	}
2747	return (tp);
2748	}
2749
2750	/*
2751	* User issued close, and wish to trail through shutdown states:
2752	* if never received SYN, just forget it. If got a SYN from peer,
2753	* but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
2754	* If already got a FIN from peer, then almost done; go to LAST_ACK
2755	* state. In all other cases, have already sent FIN to peer (e.g.
2756	* after PRU_SHUTDOWN), and just have to play tedious game waiting
2757	* for peer to send FIN or not respond to keep-alives, etc.
2758	* We can let the user exit from the close as soon as the FIN is acked.
2759	*/
2760	static struct tcpcb *
2761	tcp_usrclosed(struct tcpcb *tp)
2762	{
2763	switch (tp->t_state) {
2764
2765	case TCPS_CLOSED:
2766	case TCPS_LISTEN:
2767	case TCPS_SYN_SENT:
2768	tp = tcp_close(tp);
2769	break;
2770
2771	case TCPS_SYN_RECEIVED:
2772	tp->t_flags \|= TF_NEEDFIN;
2773	break;
2774
2775	case TCPS_ESTABLISHED:
2776	DTRACE_TCP4(state__change, void, NULL,
2777	struct inpcb *, tp->t_inpcb,
2778	struct tcpcb *, tp,
2779	int32_t, TCPS_FIN_WAIT_1);
2780	tp->t_state = TCPS_FIN_WAIT_1;
2781	break;
2782
2783	case TCPS_CLOSE_WAIT:
2784	DTRACE_TCP4(state__change, void, NULL,
2785	struct inpcb *, tp->t_inpcb,
2786	struct tcpcb *, tp,
2787	int32_t, TCPS_LAST_ACK);
2788	tp->t_state = TCPS_LAST_ACK;
2789	break;
2790	}
2791	if (tp && tp->t_state >= TCPS_FIN_WAIT_2) {
2792	soisdisconnected(tp->t_inpcb->inp_socket);
2793	/ To prevent the connection hanging in FIN_WAIT_2 forever. /
2794	if (tp->t_state == TCPS_FIN_WAIT_2)
2795	tp->t_timer[TCPT_2MSL] = OFFSET_FROM_START(tp,
2796	TCP_CONN_MAXIDLE(tp));
2797	}
2798	return (tp);
2799	}
2800
2801	void
2802	tcp_in_cksum_stats(u_int32_t len)
2803	{
2804	tcpstat.tcps_rcv_swcsum++;
2805	tcpstat.tcps_rcv_swcsum_bytes += len;
2806	}
2807
2808	void
2809	tcp_out_cksum_stats(u_int32_t len)
2810	{
2811	tcpstat.tcps_snd_swcsum++;
2812	tcpstat.tcps_snd_swcsum_bytes += len;
2813	}
2814
2815	#if INET6
2816	void
2817	tcp_in6_cksum_stats(u_int32_t len)
2818	{
2819	tcpstat.tcps_rcv6_swcsum++;
2820	tcpstat.tcps_rcv6_swcsum_bytes += len;
2821	}
2822
2823	void
2824	tcp_out6_cksum_stats(u_int32_t len)
2825	{
2826	tcpstat.tcps_snd6_swcsum++;
2827	tcpstat.tcps_snd6_swcsum_bytes += len;
2828	}
2829
2830	/*
2831	* When messages are enabled on a TCP socket, the message priority
2832	* is sent as a control message. This function will extract it.
2833	*/
2834	int
2835	tcp_get_msg_priority(struct mbuf control, uint32_t msgpri)
2836	{
2837	struct cmsghdr *cm;
2838	if (control == NULL)
2839	return(EINVAL);
2840
2841	for (cm = M_FIRST_CMSGHDR(control); cm;
2842	cm = M_NXT_CMSGHDR(control, cm)) {
2843	if (cm->cmsg_len < sizeof(struct cmsghdr) \|\|
2844	cm->cmsg_len > control->m_len) {
2845	return (EINVAL);
2846	}
2847	if (cm->cmsg_level == SOL_SOCKET &&
2848	cm->cmsg_type == SCM_MSG_PRIORITY) {
2849	msgpri = (unsigned int )(void* *)CMSG_DATA(cm);
2850	break;
2851	}
2852	}
2853
2854	VERIFY(msgpri >= MSG_PRI_MIN && msgpri <= MSG_PRI_MAX);
2855	return (`0`);
2856	}
2857	#endif /* INET6 */
2858

Browse the source code of xnu/bsd/netinet/tcp_usrreq.c