xref: /freebsd/sys/netgraph/ng_ksocket.c (revision 13014ca04aad1931d41958b56f71a2c65b9a7a2c)
1 /*
2  * ng_ksocket.c
3  */
4 
5 /*-
6  * Copyright (c) 1996-1999 Whistle Communications, Inc.
7  * All rights reserved.
8  *
9  * Subject to the following obligations and disclaimer of warranty, use and
10  * redistribution of this software, in source or object code forms, with or
11  * without modifications are expressly permitted by Whistle Communications;
12  * provided, however, that:
13  * 1. Any and all reproductions of the source or object code must include the
14  *    copyright notice above and the following disclaimer of warranties; and
15  * 2. No rights are granted, in any manner or form, to use Whistle
16  *    Communications, Inc. trademarks, including the mark "WHISTLE
17  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
18  *    such appears in the above copyright notice or in the software.
19  *
20  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
21  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
22  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
23  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
24  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
25  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
26  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
27  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
28  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
29  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
30  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
31  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
32  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
36  * OF SUCH DAMAGE.
37  *
38  * Author: Archie Cobbs <archie@freebsd.org>
39  *
40  * $FreeBSD$
41  * $Whistle: ng_ksocket.c,v 1.1 1999/11/16 20:04:40 archie Exp $
42  */
43 
44 /*
45  * Kernel socket node type.  This node type is basically a kernel-mode
46  * version of a socket... kindof like the reverse of the socket node type.
47  */
48 
49 #include <sys/param.h>
50 #include <sys/systm.h>
51 #include <sys/kernel.h>
52 #include <sys/mbuf.h>
53 #include <sys/proc.h>
54 #include <sys/malloc.h>
55 #include <sys/ctype.h>
56 #include <sys/protosw.h>
57 #include <sys/errno.h>
58 #include <sys/socket.h>
59 #include <sys/socketvar.h>
60 #include <sys/uio.h>
61 #include <sys/un.h>
62 
63 #include <netgraph/ng_message.h>
64 #include <netgraph/netgraph.h>
65 #include <netgraph/ng_parse.h>
66 #include <netgraph/ng_ksocket.h>
67 
68 #include <netinet/in.h>
69 #include <netatalk/at.h>
70 
71 #ifdef NG_SEPARATE_MALLOC
72 MALLOC_DEFINE(M_NETGRAPH_KSOCKET, "netgraph_ksock", "netgraph ksock node ");
73 #else
74 #define M_NETGRAPH_KSOCKET M_NETGRAPH
75 #endif
76 
77 #define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0))
78 #define SADATA_OFFSET	(OFFSETOF(struct sockaddr, sa_data))
79 
80 /* Node private data */
81 struct ng_ksocket_private {
82 	node_p		node;
83 	hook_p		hook;
84 	struct socket	*so;
85 	int		fn_sent;	/* FN call on incoming event was sent */
86 	LIST_HEAD(, ng_ksocket_private)	embryos;
87 	LIST_ENTRY(ng_ksocket_private)	siblings;
88 	u_int32_t	flags;
89 	u_int32_t	response_token;
90 	ng_ID_t		response_addr;
91 };
92 typedef struct ng_ksocket_private *priv_p;
93 
94 /* Flags for priv_p */
95 #define	KSF_CONNECTING	0x00000001	/* Waiting for connection complete */
96 #define	KSF_ACCEPTING	0x00000002	/* Waiting for accept complete */
97 #define	KSF_EOFSEEN	0x00000004	/* Have sent 0-length EOF mbuf */
98 #define	KSF_CLONED	0x00000008	/* Cloned from an accepting socket */
99 #define	KSF_EMBRYONIC	0x00000010	/* Cloned node with no hooks yet */
100 
101 /* Netgraph node methods */
102 static ng_constructor_t	ng_ksocket_constructor;
103 static ng_rcvmsg_t	ng_ksocket_rcvmsg;
104 static ng_shutdown_t	ng_ksocket_shutdown;
105 static ng_newhook_t	ng_ksocket_newhook;
106 static ng_rcvdata_t	ng_ksocket_rcvdata;
107 static ng_connect_t	ng_ksocket_connect;
108 static ng_disconnect_t	ng_ksocket_disconnect;
109 
110 /* Alias structure */
111 struct ng_ksocket_alias {
112 	const char	*name;
113 	const int	value;
114 	const int	family;
115 };
116 
117 /* Protocol family aliases */
118 static const struct ng_ksocket_alias ng_ksocket_families[] = {
119 	{ "local",	PF_LOCAL	},
120 	{ "inet",	PF_INET		},
121 	{ "inet6",	PF_INET6	},
122 	{ "atalk",	PF_APPLETALK	},
123 	{ "ipx",	PF_IPX		},
124 	{ "atm",	PF_ATM		},
125 	{ NULL,		-1		},
126 };
127 
128 /* Socket type aliases */
129 static const struct ng_ksocket_alias ng_ksocket_types[] = {
130 	{ "stream",	SOCK_STREAM	},
131 	{ "dgram",	SOCK_DGRAM	},
132 	{ "raw",	SOCK_RAW	},
133 	{ "rdm",	SOCK_RDM	},
134 	{ "seqpacket",	SOCK_SEQPACKET	},
135 	{ NULL,		-1		},
136 };
137 
138 /* Protocol aliases */
139 static const struct ng_ksocket_alias ng_ksocket_protos[] = {
140 	{ "ip",		IPPROTO_IP,		PF_INET		},
141 	{ "raw",	IPPROTO_RAW,		PF_INET		},
142 	{ "icmp",	IPPROTO_ICMP,		PF_INET		},
143 	{ "igmp",	IPPROTO_IGMP,		PF_INET		},
144 	{ "tcp",	IPPROTO_TCP,		PF_INET		},
145 	{ "udp",	IPPROTO_UDP,		PF_INET		},
146 	{ "gre",	IPPROTO_GRE,		PF_INET		},
147 	{ "esp",	IPPROTO_ESP,		PF_INET		},
148 	{ "ah",		IPPROTO_AH,		PF_INET		},
149 	{ "swipe",	IPPROTO_SWIPE,		PF_INET		},
150 	{ "encap",	IPPROTO_ENCAP,		PF_INET		},
151 	{ "divert",	IPPROTO_DIVERT,		PF_INET		},
152 	{ "pim",	IPPROTO_PIM,		PF_INET		},
153 	{ "ddp",	ATPROTO_DDP,		PF_APPLETALK	},
154 	{ "aarp",	ATPROTO_AARP,		PF_APPLETALK	},
155 	{ NULL,		-1					},
156 };
157 
158 /* Helper functions */
159 static int	ng_ksocket_check_accept(priv_p);
160 static void	ng_ksocket_finish_accept(priv_p);
161 static void	ng_ksocket_incoming(struct socket *so, void *arg, int waitflag);
162 static int	ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
163 			const char *s, int family);
164 static void	ng_ksocket_incoming2(node_p node, hook_p hook,
165 			void *arg1, int arg2);
166 
167 /************************************************************************
168 			STRUCT SOCKADDR PARSE TYPE
169  ************************************************************************/
170 
171 /* Get the length of the data portion of a generic struct sockaddr */
172 static int
173 ng_parse_generic_sockdata_getLength(const struct ng_parse_type *type,
174 	const u_char *start, const u_char *buf)
175 {
176 	const struct sockaddr *sa;
177 
178 	sa = (const struct sockaddr *)(buf - SADATA_OFFSET);
179 	return (sa->sa_len < SADATA_OFFSET) ? 0 : sa->sa_len - SADATA_OFFSET;
180 }
181 
182 /* Type for the variable length data portion of a generic struct sockaddr */
183 static const struct ng_parse_type ng_ksocket_generic_sockdata_type = {
184 	&ng_parse_bytearray_type,
185 	&ng_parse_generic_sockdata_getLength
186 };
187 
188 /* Type for a generic struct sockaddr */
189 static const struct ng_parse_struct_field
190     ng_parse_generic_sockaddr_type_fields[] = {
191 	  { "len",	&ng_parse_uint8_type			},
192 	  { "family",	&ng_parse_uint8_type			},
193 	  { "data",	&ng_ksocket_generic_sockdata_type	},
194 	  { NULL }
195 };
196 static const struct ng_parse_type ng_ksocket_generic_sockaddr_type = {
197 	&ng_parse_struct_type,
198 	&ng_parse_generic_sockaddr_type_fields
199 };
200 
201 /* Convert a struct sockaddr from ASCII to binary.  If its a protocol
202    family that we specially handle, do that, otherwise defer to the
203    generic parse type ng_ksocket_generic_sockaddr_type. */
204 static int
205 ng_ksocket_sockaddr_parse(const struct ng_parse_type *type,
206 	const char *s, int *off, const u_char *const start,
207 	u_char *const buf, int *buflen)
208 {
209 	struct sockaddr *const sa = (struct sockaddr *)buf;
210 	enum ng_parse_token tok;
211 	char fambuf[32];
212 	int family, len;
213 	char *t;
214 
215 	/* If next token is a left curly brace, use generic parse type */
216 	if ((tok = ng_parse_get_token(s, off, &len)) == T_LBRACE) {
217 		return (*ng_ksocket_generic_sockaddr_type.supertype->parse)
218 		    (&ng_ksocket_generic_sockaddr_type,
219 		    s, off, start, buf, buflen);
220 	}
221 
222 	/* Get socket address family followed by a slash */
223 	while (isspace(s[*off]))
224 		(*off)++;
225 	if ((t = index(s + *off, '/')) == NULL)
226 		return (EINVAL);
227 	if ((len = t - (s + *off)) > sizeof(fambuf) - 1)
228 		return (EINVAL);
229 	strncpy(fambuf, s + *off, len);
230 	fambuf[len] = '\0';
231 	*off += len + 1;
232 	if ((family = ng_ksocket_parse(ng_ksocket_families, fambuf, 0)) == -1)
233 		return (EINVAL);
234 
235 	/* Set family */
236 	if (*buflen < SADATA_OFFSET)
237 		return (ERANGE);
238 	sa->sa_family = family;
239 
240 	/* Set family-specific data and length */
241 	switch (sa->sa_family) {
242 	case PF_LOCAL:		/* Get pathname */
243 	    {
244 		const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
245 		struct sockaddr_un *const sun = (struct sockaddr_un *)sa;
246 		int toklen, pathlen;
247 		char *path;
248 
249 		if ((path = ng_get_string_token(s, off, &toklen, NULL)) == NULL)
250 			return (EINVAL);
251 		pathlen = strlen(path);
252 		if (pathlen > SOCK_MAXADDRLEN) {
253 			FREE(path, M_NETGRAPH_KSOCKET);
254 			return (E2BIG);
255 		}
256 		if (*buflen < pathoff + pathlen) {
257 			FREE(path, M_NETGRAPH_KSOCKET);
258 			return (ERANGE);
259 		}
260 		*off += toklen;
261 		bcopy(path, sun->sun_path, pathlen);
262 		sun->sun_len = pathoff + pathlen;
263 		FREE(path, M_NETGRAPH_KSOCKET);
264 		break;
265 	    }
266 
267 	case PF_INET:		/* Get an IP address with optional port */
268 	    {
269 		struct sockaddr_in *const sin = (struct sockaddr_in *)sa;
270 		int i;
271 
272 		/* Parse this: <ipaddress>[:port] */
273 		for (i = 0; i < 4; i++) {
274 			u_long val;
275 			char *eptr;
276 
277 			val = strtoul(s + *off, &eptr, 10);
278 			if (val > 0xff || eptr == s + *off)
279 				return (EINVAL);
280 			*off += (eptr - (s + *off));
281 			((u_char *)&sin->sin_addr)[i] = (u_char)val;
282 			if (i < 3) {
283 				if (s[*off] != '.')
284 					return (EINVAL);
285 				(*off)++;
286 			} else if (s[*off] == ':') {
287 				(*off)++;
288 				val = strtoul(s + *off, &eptr, 10);
289 				if (val > 0xffff || eptr == s + *off)
290 					return (EINVAL);
291 				*off += (eptr - (s + *off));
292 				sin->sin_port = htons(val);
293 			} else
294 				sin->sin_port = 0;
295 		}
296 		bzero(&sin->sin_zero, sizeof(sin->sin_zero));
297 		sin->sin_len = sizeof(*sin);
298 		break;
299 	    }
300 
301 #if 0
302 	case PF_APPLETALK:	/* XXX implement these someday */
303 	case PF_INET6:
304 	case PF_IPX:
305 #endif
306 
307 	default:
308 		return (EINVAL);
309 	}
310 
311 	/* Done */
312 	*buflen = sa->sa_len;
313 	return (0);
314 }
315 
316 /* Convert a struct sockaddr from binary to ASCII */
317 static int
318 ng_ksocket_sockaddr_unparse(const struct ng_parse_type *type,
319 	const u_char *data, int *off, char *cbuf, int cbuflen)
320 {
321 	const struct sockaddr *sa = (const struct sockaddr *)(data + *off);
322 	int slen = 0;
323 
324 	/* Output socket address, either in special or generic format */
325 	switch (sa->sa_family) {
326 	case PF_LOCAL:
327 	    {
328 		const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
329 		const struct sockaddr_un *sun = (const struct sockaddr_un *)sa;
330 		const int pathlen = sun->sun_len - pathoff;
331 		char pathbuf[SOCK_MAXADDRLEN + 1];
332 		char *pathtoken;
333 
334 		bcopy(sun->sun_path, pathbuf, pathlen);
335 		if ((pathtoken = ng_encode_string(pathbuf, pathlen)) == NULL)
336 			return (ENOMEM);
337 		slen += snprintf(cbuf, cbuflen, "local/%s", pathtoken);
338 		FREE(pathtoken, M_NETGRAPH_KSOCKET);
339 		if (slen >= cbuflen)
340 			return (ERANGE);
341 		*off += sun->sun_len;
342 		return (0);
343 	    }
344 
345 	case PF_INET:
346 	    {
347 		const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
348 
349 		slen += snprintf(cbuf, cbuflen, "inet/%d.%d.%d.%d",
350 		  ((const u_char *)&sin->sin_addr)[0],
351 		  ((const u_char *)&sin->sin_addr)[1],
352 		  ((const u_char *)&sin->sin_addr)[2],
353 		  ((const u_char *)&sin->sin_addr)[3]);
354 		if (sin->sin_port != 0) {
355 			slen += snprintf(cbuf + strlen(cbuf),
356 			    cbuflen - strlen(cbuf), ":%d",
357 			    (u_int)ntohs(sin->sin_port));
358 		}
359 		if (slen >= cbuflen)
360 			return (ERANGE);
361 		*off += sizeof(*sin);
362 		return(0);
363 	    }
364 
365 #if 0
366 	case PF_APPLETALK:	/* XXX implement these someday */
367 	case PF_INET6:
368 	case PF_IPX:
369 #endif
370 
371 	default:
372 		return (*ng_ksocket_generic_sockaddr_type.supertype->unparse)
373 		    (&ng_ksocket_generic_sockaddr_type,
374 		    data, off, cbuf, cbuflen);
375 	}
376 }
377 
378 /* Parse type for struct sockaddr */
379 static const struct ng_parse_type ng_ksocket_sockaddr_type = {
380 	NULL,
381 	NULL,
382 	NULL,
383 	&ng_ksocket_sockaddr_parse,
384 	&ng_ksocket_sockaddr_unparse,
385 	NULL		/* no such thing as a default struct sockaddr */
386 };
387 
388 /************************************************************************
389 		STRUCT NG_KSOCKET_SOCKOPT PARSE TYPE
390  ************************************************************************/
391 
392 /* Get length of the struct ng_ksocket_sockopt value field, which is the
393    just the excess of the message argument portion over the length of
394    the struct ng_ksocket_sockopt. */
395 static int
396 ng_parse_sockoptval_getLength(const struct ng_parse_type *type,
397 	const u_char *start, const u_char *buf)
398 {
399 	static const int offset = OFFSETOF(struct ng_ksocket_sockopt, value);
400 	const struct ng_ksocket_sockopt *sopt;
401 	const struct ng_mesg *msg;
402 
403 	sopt = (const struct ng_ksocket_sockopt *)(buf - offset);
404 	msg = (const struct ng_mesg *)((const u_char *)sopt - sizeof(*msg));
405 	return msg->header.arglen - sizeof(*sopt);
406 }
407 
408 /* Parse type for the option value part of a struct ng_ksocket_sockopt
409    XXX Eventually, we should handle the different socket options specially.
410    XXX This would avoid byte order problems, eg an integer value of 1 is
411    XXX going to be "[1]" for little endian or "[3=1]" for big endian. */
412 static const struct ng_parse_type ng_ksocket_sockoptval_type = {
413 	&ng_parse_bytearray_type,
414 	&ng_parse_sockoptval_getLength
415 };
416 
417 /* Parse type for struct ng_ksocket_sockopt */
418 static const struct ng_parse_struct_field ng_ksocket_sockopt_type_fields[]
419 	= NG_KSOCKET_SOCKOPT_INFO(&ng_ksocket_sockoptval_type);
420 static const struct ng_parse_type ng_ksocket_sockopt_type = {
421 	&ng_parse_struct_type,
422 	&ng_ksocket_sockopt_type_fields
423 };
424 
425 /* Parse type for struct ng_ksocket_accept */
426 static const struct ng_parse_struct_field ng_ksocket_accept_type_fields[]
427 	= NGM_KSOCKET_ACCEPT_INFO;
428 static const struct ng_parse_type ng_ksocket_accept_type = {
429 	&ng_parse_struct_type,
430 	&ng_ksocket_accept_type_fields
431 };
432 
433 /* List of commands and how to convert arguments to/from ASCII */
434 static const struct ng_cmdlist ng_ksocket_cmds[] = {
435 	{
436 	  NGM_KSOCKET_COOKIE,
437 	  NGM_KSOCKET_BIND,
438 	  "bind",
439 	  &ng_ksocket_sockaddr_type,
440 	  NULL
441 	},
442 	{
443 	  NGM_KSOCKET_COOKIE,
444 	  NGM_KSOCKET_LISTEN,
445 	  "listen",
446 	  &ng_parse_int32_type,
447 	  NULL
448 	},
449 	{
450 	  NGM_KSOCKET_COOKIE,
451 	  NGM_KSOCKET_ACCEPT,
452 	  "accept",
453 	  NULL,
454 	  &ng_ksocket_accept_type
455 	},
456 	{
457 	  NGM_KSOCKET_COOKIE,
458 	  NGM_KSOCKET_CONNECT,
459 	  "connect",
460 	  &ng_ksocket_sockaddr_type,
461 	  &ng_parse_int32_type
462 	},
463 	{
464 	  NGM_KSOCKET_COOKIE,
465 	  NGM_KSOCKET_GETNAME,
466 	  "getname",
467 	  NULL,
468 	  &ng_ksocket_sockaddr_type
469 	},
470 	{
471 	  NGM_KSOCKET_COOKIE,
472 	  NGM_KSOCKET_GETPEERNAME,
473 	  "getpeername",
474 	  NULL,
475 	  &ng_ksocket_sockaddr_type
476 	},
477 	{
478 	  NGM_KSOCKET_COOKIE,
479 	  NGM_KSOCKET_SETOPT,
480 	  "setopt",
481 	  &ng_ksocket_sockopt_type,
482 	  NULL
483 	},
484 	{
485 	  NGM_KSOCKET_COOKIE,
486 	  NGM_KSOCKET_GETOPT,
487 	  "getopt",
488 	  &ng_ksocket_sockopt_type,
489 	  &ng_ksocket_sockopt_type
490 	},
491 	{ 0 }
492 };
493 
494 /* Node type descriptor */
495 static struct ng_type ng_ksocket_typestruct = {
496 	.version =	NG_ABI_VERSION,
497 	.name =		NG_KSOCKET_NODE_TYPE,
498 	.constructor =	ng_ksocket_constructor,
499 	.rcvmsg =	ng_ksocket_rcvmsg,
500 	.shutdown =	ng_ksocket_shutdown,
501 	.newhook =	ng_ksocket_newhook,
502 	.connect =	ng_ksocket_connect,
503 	.rcvdata =	ng_ksocket_rcvdata,
504 	.disconnect =	ng_ksocket_disconnect,
505 	.cmdlist =	ng_ksocket_cmds,
506 };
507 NETGRAPH_INIT(ksocket, &ng_ksocket_typestruct);
508 
509 #define ERROUT(x)	do { error = (x); goto done; } while (0)
510 
511 /************************************************************************
512 			NETGRAPH NODE STUFF
513  ************************************************************************/
514 
515 /*
516  * Node type constructor
517  * The NODE part is assumed to be all set up.
518  * There is already a reference to the node for us.
519  */
520 static int
521 ng_ksocket_constructor(node_p node)
522 {
523 	priv_p priv;
524 
525 	/* Allocate private structure */
526 	MALLOC(priv, priv_p, sizeof(*priv),
527 	    M_NETGRAPH_KSOCKET, M_NOWAIT | M_ZERO);
528 	if (priv == NULL)
529 		return (ENOMEM);
530 
531 	LIST_INIT(&priv->embryos);
532 	/* cross link them */
533 	priv->node = node;
534 	NG_NODE_SET_PRIVATE(node, priv);
535 
536 	/* Done */
537 	return (0);
538 }
539 
540 /*
541  * Give our OK for a hook to be added. The hook name is of the
542  * form "<family>/<type>/<proto>" where the three components may
543  * be decimal numbers or else aliases from the above lists.
544  *
545  * Connecting a hook amounts to opening the socket.  Disconnecting
546  * the hook closes the socket and destroys the node as well.
547  */
548 static int
549 ng_ksocket_newhook(node_p node, hook_p hook, const char *name0)
550 {
551 	struct thread *td = curthread;	/* XXX broken */
552 	const priv_p priv = NG_NODE_PRIVATE(node);
553 	char *s1, *s2, name[NG_HOOKSIZ];
554 	int family, type, protocol, error;
555 
556 	/* Check if we're already connected */
557 	if (priv->hook != NULL)
558 		return (EISCONN);
559 
560 	if (priv->flags & KSF_CLONED) {
561 		if (priv->flags & KSF_EMBRYONIC) {
562 			/* Remove ourselves from our parent's embryo list */
563 			LIST_REMOVE(priv, siblings);
564 			priv->flags &= ~KSF_EMBRYONIC;
565 		}
566 	} else {
567 		/* Extract family, type, and protocol from hook name */
568 		snprintf(name, sizeof(name), "%s", name0);
569 		s1 = name;
570 		if ((s2 = index(s1, '/')) == NULL)
571 			return (EINVAL);
572 		*s2++ = '\0';
573 		family = ng_ksocket_parse(ng_ksocket_families, s1, 0);
574 		if (family == -1)
575 			return (EINVAL);
576 		s1 = s2;
577 		if ((s2 = index(s1, '/')) == NULL)
578 			return (EINVAL);
579 		*s2++ = '\0';
580 		type = ng_ksocket_parse(ng_ksocket_types, s1, 0);
581 		if (type == -1)
582 			return (EINVAL);
583 		s1 = s2;
584 		protocol = ng_ksocket_parse(ng_ksocket_protos, s1, family);
585 		if (protocol == -1)
586 			return (EINVAL);
587 
588 		/* Create the socket */
589 		error = socreate(family, &priv->so, type, protocol,
590 		   td->td_ucred, td);
591 		if (error != 0)
592 			return (error);
593 
594 		/* XXX call soreserve() ? */
595 
596 	}
597 
598 	/* OK */
599 	priv->hook = hook;
600 
601 	/*
602 	 * In case of misconfigured routing a packet may reenter
603 	 * ksocket node recursively. Decouple stack to avoid possible
604 	 * panics about sleeping with locks held.
605 	 */
606 	NG_HOOK_FORCE_QUEUE(hook);
607 
608 	return(0);
609 }
610 
611 static int
612 ng_ksocket_connect(hook_p hook)
613 {
614 	node_p node = NG_HOOK_NODE(hook);
615 	const priv_p priv = NG_NODE_PRIVATE(node);
616 	struct socket *const so = priv->so;
617 
618 	/* Add our hook for incoming data and other events */
619 	priv->so->so_upcallarg = (caddr_t)node;
620 	priv->so->so_upcall = ng_ksocket_incoming;
621 	SOCKBUF_LOCK(&priv->so->so_rcv);
622 	priv->so->so_rcv.sb_flags |= SB_UPCALL;
623 	SOCKBUF_UNLOCK(&priv->so->so_rcv);
624 	SOCKBUF_LOCK(&priv->so->so_snd);
625 	priv->so->so_snd.sb_flags |= SB_UPCALL;
626 	SOCKBUF_UNLOCK(&priv->so->so_snd);
627 	SOCK_LOCK(priv->so);
628 	priv->so->so_state |= SS_NBIO;
629 	SOCK_UNLOCK(priv->so);
630 	/*
631 	 * --Original comment--
632 	 * On a cloned socket we may have already received one or more
633 	 * upcalls which we couldn't handle without a hook.  Handle
634 	 * those now.
635 	 * We cannot call the upcall function directly
636 	 * from here, because until this function has returned our
637 	 * hook isn't connected.
638 	 *
639 	 * ---meta comment for -current ---
640 	 * XXX This is dubius.
641 	 * Upcalls between the time that the hook was
642 	 * first created and now (on another processesor) will
643 	 * be earlier on the queue than the request to finalise the hook.
644 	 * By the time the hook is finalised,
645 	 * The queued upcalls will have happenned and the code
646 	 * will have discarded them because of a lack of a hook.
647 	 * (socket not open).
648 	 *
649 	 * This is a bad byproduct of the complicated way in which hooks
650 	 * are now created (3 daisy chained async events).
651 	 *
652 	 * Since we are a netgraph operation
653 	 * We know that we hold a lock on this node. This forces the
654 	 * request we make below to be queued rather than implemented
655 	 * immediatly which will cause the upcall function to be called a bit
656 	 * later.
657 	 * However, as we will run any waiting queued operations immediatly
658 	 * after doing this one, if we have not finalised the other end
659 	 * of the hook, those queued operations will fail.
660 	 */
661 	if (priv->flags & KSF_CLONED) {
662 		ng_send_fn(node, NULL, &ng_ksocket_incoming2, so, M_NOWAIT);
663 	}
664 
665 	return (0);
666 }
667 
668 /*
669  * Receive a control message
670  */
671 static int
672 ng_ksocket_rcvmsg(node_p node, item_p item, hook_p lasthook)
673 {
674 	struct thread *td = curthread;	/* XXX broken */
675 	const priv_p priv = NG_NODE_PRIVATE(node);
676 	struct socket *const so = priv->so;
677 	struct ng_mesg *resp = NULL;
678 	int error = 0;
679 	struct ng_mesg *msg;
680 	ng_ID_t raddr;
681 
682 	NGI_GET_MSG(item, msg);
683 	switch (msg->header.typecookie) {
684 	case NGM_KSOCKET_COOKIE:
685 		switch (msg->header.cmd) {
686 		case NGM_KSOCKET_BIND:
687 		    {
688 			struct sockaddr *const sa
689 			    = (struct sockaddr *)msg->data;
690 
691 			/* Sanity check */
692 			if (msg->header.arglen < SADATA_OFFSET
693 			    || msg->header.arglen < sa->sa_len)
694 				ERROUT(EINVAL);
695 			if (so == NULL)
696 				ERROUT(ENXIO);
697 
698 			/* Bind */
699 			error = sobind(so, sa, td);
700 			break;
701 		    }
702 		case NGM_KSOCKET_LISTEN:
703 		    {
704 			/* Sanity check */
705 			if (msg->header.arglen != sizeof(int32_t))
706 				ERROUT(EINVAL);
707 			if (so == NULL)
708 				ERROUT(ENXIO);
709 
710 			/* Listen */
711 			error = solisten(so, *((int32_t *)msg->data), td);
712 			break;
713 		    }
714 
715 		case NGM_KSOCKET_ACCEPT:
716 		    {
717 			/* Sanity check */
718 			if (msg->header.arglen != 0)
719 				ERROUT(EINVAL);
720 			if (so == NULL)
721 				ERROUT(ENXIO);
722 
723 			/* Make sure the socket is capable of accepting */
724 			if (!(so->so_options & SO_ACCEPTCONN))
725 				ERROUT(EINVAL);
726 			if (priv->flags & KSF_ACCEPTING)
727 				ERROUT(EALREADY);
728 
729 			error = ng_ksocket_check_accept(priv);
730 			if (error != 0 && error != EWOULDBLOCK)
731 				ERROUT(error);
732 
733 			/*
734 			 * If a connection is already complete, take it.
735 			 * Otherwise let the upcall function deal with
736 			 * the connection when it comes in.
737 			 */
738 			priv->response_token = msg->header.token;
739 			raddr = priv->response_addr = NGI_RETADDR(item);
740 			if (error == 0) {
741 				ng_ksocket_finish_accept(priv);
742 			} else
743 				priv->flags |= KSF_ACCEPTING;
744 			break;
745 		    }
746 
747 		case NGM_KSOCKET_CONNECT:
748 		    {
749 			struct sockaddr *const sa
750 			    = (struct sockaddr *)msg->data;
751 
752 			/* Sanity check */
753 			if (msg->header.arglen < SADATA_OFFSET
754 			    || msg->header.arglen < sa->sa_len)
755 				ERROUT(EINVAL);
756 			if (so == NULL)
757 				ERROUT(ENXIO);
758 
759 			/* Do connect */
760 			if ((so->so_state & SS_ISCONNECTING) != 0)
761 				ERROUT(EALREADY);
762 			if ((error = soconnect(so, sa, td)) != 0) {
763 				so->so_state &= ~SS_ISCONNECTING;
764 				ERROUT(error);
765 			}
766 			if ((so->so_state & SS_ISCONNECTING) != 0) {
767 				/* We will notify the sender when we connect */
768 				priv->response_token = msg->header.token;
769 				raddr = priv->response_addr = NGI_RETADDR(item);
770 				priv->flags |= KSF_CONNECTING;
771 				ERROUT(EINPROGRESS);
772 			}
773 			break;
774 		    }
775 
776 		case NGM_KSOCKET_GETNAME:
777 		case NGM_KSOCKET_GETPEERNAME:
778 		    {
779 			int (*func)(struct socket *so, struct sockaddr **nam);
780 			struct sockaddr *sa = NULL;
781 			int len;
782 
783 			/* Sanity check */
784 			if (msg->header.arglen != 0)
785 				ERROUT(EINVAL);
786 			if (so == NULL)
787 				ERROUT(ENXIO);
788 
789 			/* Get function */
790 			if (msg->header.cmd == NGM_KSOCKET_GETPEERNAME) {
791 				if ((so->so_state
792 				    & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0)
793 					ERROUT(ENOTCONN);
794 				func = so->so_proto->pr_usrreqs->pru_peeraddr;
795 			} else
796 				func = so->so_proto->pr_usrreqs->pru_sockaddr;
797 
798 			/* Get local or peer address */
799 			if ((error = (*func)(so, &sa)) != 0)
800 				goto bail;
801 			len = (sa == NULL) ? 0 : sa->sa_len;
802 
803 			/* Send it back in a response */
804 			NG_MKRESPONSE(resp, msg, len, M_NOWAIT);
805 			if (resp == NULL) {
806 				error = ENOMEM;
807 				goto bail;
808 			}
809 			bcopy(sa, resp->data, len);
810 
811 		bail:
812 			/* Cleanup */
813 			if (sa != NULL)
814 				FREE(sa, M_SONAME);
815 			break;
816 		    }
817 
818 		case NGM_KSOCKET_GETOPT:
819 		    {
820 			struct ng_ksocket_sockopt *ksopt =
821 			    (struct ng_ksocket_sockopt *)msg->data;
822 			struct sockopt sopt;
823 
824 			/* Sanity check */
825 			if (msg->header.arglen != sizeof(*ksopt))
826 				ERROUT(EINVAL);
827 			if (so == NULL)
828 				ERROUT(ENXIO);
829 
830 			/* Get response with room for option value */
831 			NG_MKRESPONSE(resp, msg, sizeof(*ksopt)
832 			    + NG_KSOCKET_MAX_OPTLEN, M_NOWAIT);
833 			if (resp == NULL)
834 				ERROUT(ENOMEM);
835 
836 			/* Get socket option, and put value in the response */
837 			sopt.sopt_dir = SOPT_GET;
838 			sopt.sopt_level = ksopt->level;
839 			sopt.sopt_name = ksopt->name;
840 			sopt.sopt_td = NULL;
841 			sopt.sopt_valsize = NG_KSOCKET_MAX_OPTLEN;
842 			ksopt = (struct ng_ksocket_sockopt *)resp->data;
843 			sopt.sopt_val = ksopt->value;
844 			if ((error = sogetopt(so, &sopt)) != 0) {
845 				NG_FREE_MSG(resp);
846 				break;
847 			}
848 
849 			/* Set actual value length */
850 			resp->header.arglen = sizeof(*ksopt)
851 			    + sopt.sopt_valsize;
852 			break;
853 		    }
854 
855 		case NGM_KSOCKET_SETOPT:
856 		    {
857 			struct ng_ksocket_sockopt *const ksopt =
858 			    (struct ng_ksocket_sockopt *)msg->data;
859 			const int valsize = msg->header.arglen - sizeof(*ksopt);
860 			struct sockopt sopt;
861 
862 			/* Sanity check */
863 			if (valsize < 0)
864 				ERROUT(EINVAL);
865 			if (so == NULL)
866 				ERROUT(ENXIO);
867 
868 			/* Set socket option */
869 			sopt.sopt_dir = SOPT_SET;
870 			sopt.sopt_level = ksopt->level;
871 			sopt.sopt_name = ksopt->name;
872 			sopt.sopt_val = ksopt->value;
873 			sopt.sopt_valsize = valsize;
874 			sopt.sopt_td = NULL;
875 			error = sosetopt(so, &sopt);
876 			break;
877 		    }
878 
879 		default:
880 			error = EINVAL;
881 			break;
882 		}
883 		break;
884 	default:
885 		error = EINVAL;
886 		break;
887 	}
888 done:
889 	NG_RESPOND_MSG(error, node, item, resp);
890 	NG_FREE_MSG(msg);
891 	return (error);
892 }
893 
894 /*
895  * Receive incoming data on our hook.  Send it out the socket.
896  */
897 static int
898 ng_ksocket_rcvdata(hook_p hook, item_p item)
899 {
900 	struct thread *td = curthread;	/* XXX broken */
901 	const node_p node = NG_HOOK_NODE(hook);
902 	const priv_p priv = NG_NODE_PRIVATE(node);
903 	struct socket *const so = priv->so;
904 	struct sockaddr *sa = NULL;
905 	int error;
906 	struct mbuf *m;
907 	struct sa_tag *stag;
908 
909 	/* Extract data */
910 	NGI_GET_M(item, m);
911 	NG_FREE_ITEM(item);
912 
913 	/*
914 	 * Look if socket address is stored in packet tags.
915 	 * If sockaddr is ours, or provided by a third party (zero id),
916 	 * then we accept it.
917 	 */
918 	if (((stag = (struct sa_tag *)m_tag_locate(m, NGM_KSOCKET_COOKIE,
919 	    NG_KSOCKET_TAG_SOCKADDR, NULL)) != NULL) &&
920 	    (stag->id == NG_NODE_ID(node) || stag->id == 0))
921 		sa = &stag->sa;
922 
923 	/* Reset specific mbuf flags to prevent addressing problems. */
924 	m->m_flags &= ~(M_BCAST|M_MCAST);
925 
926 	/* Send packet */
927 	error = sosend(so, sa, 0, m, 0, 0, td);
928 
929 	return (error);
930 }
931 
932 /*
933  * Destroy node
934  */
935 static int
936 ng_ksocket_shutdown(node_p node)
937 {
938 	const priv_p priv = NG_NODE_PRIVATE(node);
939 	priv_p embryo;
940 
941 	/* Close our socket (if any) */
942 	if (priv->so != NULL) {
943 		SOCKBUF_LOCK(&priv->so->so_rcv);
944 		priv->so->so_rcv.sb_flags &= ~SB_UPCALL;
945 		SOCKBUF_UNLOCK(&priv->so->so_rcv);
946 		SOCKBUF_LOCK(&priv->so->so_snd);
947 		priv->so->so_snd.sb_flags &= ~SB_UPCALL;
948 		SOCKBUF_UNLOCK(&priv->so->so_snd);
949 		priv->so->so_upcall = NULL;
950 		soclose(priv->so);
951 		priv->so = NULL;
952 	}
953 
954 	/* If we are an embryo, take ourselves out of the parent's list */
955 	if (priv->flags & KSF_EMBRYONIC) {
956 		LIST_REMOVE(priv, siblings);
957 		priv->flags &= ~KSF_EMBRYONIC;
958 	}
959 
960 	/* Remove any embryonic children we have */
961 	while (!LIST_EMPTY(&priv->embryos)) {
962 		embryo = LIST_FIRST(&priv->embryos);
963 		ng_rmnode_self(embryo->node);
964 	}
965 
966 	/* Take down netgraph node */
967 	bzero(priv, sizeof(*priv));
968 	FREE(priv, M_NETGRAPH_KSOCKET);
969 	NG_NODE_SET_PRIVATE(node, NULL);
970 	NG_NODE_UNREF(node);		/* let the node escape */
971 	return (0);
972 }
973 
974 /*
975  * Hook disconnection
976  */
977 static int
978 ng_ksocket_disconnect(hook_p hook)
979 {
980 	KASSERT(NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0,
981 	    ("%s: numhooks=%d?", __func__,
982 	    NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook))));
983 	if (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))
984 		ng_rmnode_self(NG_HOOK_NODE(hook));
985 	return (0);
986 }
987 
988 /************************************************************************
989 			HELPER STUFF
990  ************************************************************************/
991 /*
992  * You should not "just call" a netgraph node function from an external
993  * asynchronous event. This is because in doing so you are ignoring the
994  * locking on the netgraph nodes. Instead call your function via ng_send_fn().
995  * This will call the function you chose, but will first do all the
996  * locking rigmarole. Your function MAY only be called at some distant future
997  * time (several millisecs away) so don't give it any arguments
998  * that may be revoked soon (e.g. on your stack).
999  *
1000  * To decouple stack, we use queue version of ng_send_fn().
1001  */
1002 
1003 static void
1004 ng_ksocket_incoming(struct socket *so, void *arg, int waitflag)
1005 {
1006 	const node_p node = arg;
1007 	const priv_p priv = NG_NODE_PRIVATE(node);
1008 	int wait = ((waitflag & M_WAITOK) ? NG_WAITOK : 0) | NG_QUEUE;
1009 
1010 	/*
1011 	 * Even if node is not locked, as soon as we are called, we assume
1012 	 * it exist and it's private area is valid. With some care we can
1013 	 * access it. Mark node that incoming event for it was sent to
1014 	 * avoid unneded queue trashing.
1015 	 */
1016 	if (atomic_cmpset_int(&priv->fn_sent, 0, 1) &&
1017 	    ng_send_fn1(node, NULL, &ng_ksocket_incoming2, so, 0, wait)) {
1018 		atomic_store_rel_int(&priv->fn_sent, 0);
1019 	}
1020 }
1021 
1022 
1023 /*
1024  * When incoming data is appended to the socket, we get notified here.
1025  * This is also called whenever a significant event occurs for the socket.
1026  * Our original caller may have queued this even some time ago and
1027  * we cannot trust that he even still exists. The node however is being
1028  * held with a reference by the queueing code and guarantied to be valid.
1029  */
1030 static void
1031 ng_ksocket_incoming2(node_p node, hook_p hook, void *arg1, int arg2)
1032 {
1033 	struct socket *so = arg1;
1034 	const priv_p priv = NG_NODE_PRIVATE(node);
1035 	struct mbuf *m;
1036 	struct ng_mesg *response;
1037 	struct uio auio;
1038 	int s, flags, error;
1039 
1040 	s = splnet();
1041 
1042 	/* so = priv->so; *//* XXX could have derived this like so */
1043 	KASSERT(so == priv->so, ("%s: wrong socket", __func__));
1044 
1045 	/* Allow next incoming event to be queued. */
1046 	atomic_store_rel_int(&priv->fn_sent, 0);
1047 
1048 	/* Check whether a pending connect operation has completed */
1049 	if (priv->flags & KSF_CONNECTING) {
1050 		if ((error = so->so_error) != 0) {
1051 			so->so_error = 0;
1052 			so->so_state &= ~SS_ISCONNECTING;
1053 		}
1054 		if (!(so->so_state & SS_ISCONNECTING)) {
1055 			NG_MKMESSAGE(response, NGM_KSOCKET_COOKIE,
1056 			    NGM_KSOCKET_CONNECT, sizeof(int32_t), M_NOWAIT);
1057 			if (response != NULL) {
1058 				response->header.flags |= NGF_RESP;
1059 				response->header.token = priv->response_token;
1060 				*(int32_t *)response->data = error;
1061 				/*
1062 				 * send an async "response" message
1063 				 * to the node that set us up
1064 				 * (if it still exists)
1065 				 */
1066 				NG_SEND_MSG_ID(error, node,
1067 				    response, priv->response_addr, 0);
1068 			}
1069 			priv->flags &= ~KSF_CONNECTING;
1070 		}
1071 	}
1072 
1073 	/* Check whether a pending accept operation has completed */
1074 	if (priv->flags & KSF_ACCEPTING) {
1075 		error = ng_ksocket_check_accept(priv);
1076 		if (error != EWOULDBLOCK)
1077 			priv->flags &= ~KSF_ACCEPTING;
1078 		if (error == 0)
1079 			ng_ksocket_finish_accept(priv);
1080 	}
1081 
1082 	/*
1083 	 * If we don't have a hook, we must handle data events later.  When
1084 	 * the hook gets created and is connected, this upcall function
1085 	 * will be called again.
1086 	 */
1087 	if (priv->hook == NULL) {
1088 		splx(s);
1089 		return;
1090 	}
1091 
1092 	/* Read and forward available mbuf's */
1093 	auio.uio_td = NULL;
1094 	auio.uio_resid = 1000000000;
1095 	flags = MSG_DONTWAIT;
1096 	while (1) {
1097 		struct sockaddr *sa = NULL;
1098 		struct mbuf *n;
1099 
1100 		/* Try to get next packet from socket */
1101 		if ((error = soreceive(so, (so->so_state & SS_ISCONNECTED) ?
1102 		    NULL : &sa, &auio, &m, (struct mbuf **)0, &flags)) != 0)
1103 			break;
1104 
1105 		/* See if we got anything */
1106 		if (m == NULL) {
1107 			if (sa != NULL)
1108 				FREE(sa, M_SONAME);
1109 			break;
1110 		}
1111 
1112 		/*
1113 		 * Don't trust the various socket layers to get the
1114 		 * packet header and length correct (e.g. kern/15175).
1115 		 *
1116 		 * Also, do not trust that soreceive() will clear m_nextpkt
1117 		 * for us (e.g. kern/84952, kern/82413).
1118 		 */
1119 		m->m_pkthdr.csum_flags = 0;
1120 		for (n = m, m->m_pkthdr.len = 0; n != NULL; n = n->m_next) {
1121 			m->m_pkthdr.len += n->m_len;
1122 			n->m_nextpkt = NULL;
1123 		}
1124 
1125 		/* Put peer's socket address (if any) into a tag */
1126 		if (sa != NULL) {
1127 			struct sa_tag	*stag;
1128 
1129 			stag = (struct sa_tag *)m_tag_alloc(NGM_KSOCKET_COOKIE,
1130 			    NG_KSOCKET_TAG_SOCKADDR, sizeof(ng_ID_t) +
1131 			    sa->sa_len, M_NOWAIT);
1132 			if (stag == NULL) {
1133 				FREE(sa, M_SONAME);
1134 				goto sendit;
1135 			}
1136 			bcopy(sa, &stag->sa, sa->sa_len);
1137 			FREE(sa, M_SONAME);
1138 			stag->id = NG_NODE_ID(node);
1139 			m_tag_prepend(m, &stag->tag);
1140 		}
1141 
1142 sendit:		/* Forward data with optional peer sockaddr as packet tag */
1143 		NG_SEND_DATA_ONLY(error, priv->hook, m);
1144 	}
1145 
1146 	/*
1147 	 * If the peer has closed the connection, forward a 0-length mbuf
1148 	 * to indicate end-of-file.
1149 	 */
1150 	if (so->so_rcv.sb_state & SBS_CANTRCVMORE && !(priv->flags & KSF_EOFSEEN)) {
1151 		MGETHDR(m, M_NOWAIT, MT_DATA);
1152 		if (m != NULL) {
1153 			m->m_len = m->m_pkthdr.len = 0;
1154 			NG_SEND_DATA_ONLY(error, priv->hook, m);
1155 		}
1156 		priv->flags |= KSF_EOFSEEN;
1157 	}
1158 	splx(s);
1159 }
1160 
1161 /*
1162  * Check for a completed incoming connection and return 0 if one is found.
1163  * Otherwise return the appropriate error code.
1164  */
1165 static int
1166 ng_ksocket_check_accept(priv_p priv)
1167 {
1168 	struct socket *const head = priv->so;
1169 	int error;
1170 
1171 	if ((error = head->so_error) != 0) {
1172 		head->so_error = 0;
1173 		return error;
1174 	}
1175 	/* Unlocked read. */
1176 	if (TAILQ_EMPTY(&head->so_comp)) {
1177 		if (head->so_rcv.sb_state & SBS_CANTRCVMORE)
1178 			return ECONNABORTED;
1179 		return EWOULDBLOCK;
1180 	}
1181 	return 0;
1182 }
1183 
1184 /*
1185  * Handle the first completed incoming connection, assumed to be already
1186  * on the socket's so_comp queue.
1187  */
1188 static void
1189 ng_ksocket_finish_accept(priv_p priv)
1190 {
1191 	struct socket *const head = priv->so;
1192 	struct socket *so;
1193 	struct sockaddr *sa = NULL;
1194 	struct ng_mesg *resp;
1195 	struct ng_ksocket_accept *resp_data;
1196 	node_p node;
1197 	priv_p priv2;
1198 	int len;
1199 	int error;
1200 
1201 	ACCEPT_LOCK();
1202 	so = TAILQ_FIRST(&head->so_comp);
1203 	if (so == NULL) {	/* Should never happen */
1204 		ACCEPT_UNLOCK();
1205 		return;
1206 	}
1207 	TAILQ_REMOVE(&head->so_comp, so, so_list);
1208 	head->so_qlen--;
1209 	so->so_qstate &= ~SQ_COMP;
1210 	so->so_head = NULL;
1211 	SOCK_LOCK(so);
1212 	soref(so);
1213 	so->so_state |= SS_NBIO;
1214 	SOCK_UNLOCK(so);
1215 	ACCEPT_UNLOCK();
1216 
1217 	/* XXX KNOTE(&head->so_rcv.sb_sel.si_note, 0); */
1218 
1219 	soaccept(so, &sa);
1220 
1221 	len = OFFSETOF(struct ng_ksocket_accept, addr);
1222 	if (sa != NULL)
1223 		len += sa->sa_len;
1224 
1225 	NG_MKMESSAGE(resp, NGM_KSOCKET_COOKIE, NGM_KSOCKET_ACCEPT, len,
1226 	    M_NOWAIT);
1227 	if (resp == NULL) {
1228 		soclose(so);
1229 		goto out;
1230 	}
1231 	resp->header.flags |= NGF_RESP;
1232 	resp->header.token = priv->response_token;
1233 
1234 	/* Clone a ksocket node to wrap the new socket */
1235         error = ng_make_node_common(&ng_ksocket_typestruct, &node);
1236         if (error) {
1237 		FREE(resp, M_NETGRAPH);
1238 		soclose(so);
1239 		goto out;
1240 	}
1241 
1242 	if (ng_ksocket_constructor(node) != 0) {
1243 		NG_NODE_UNREF(node);
1244 		FREE(resp, M_NETGRAPH);
1245 		soclose(so);
1246 		goto out;
1247 	}
1248 
1249 	priv2 = NG_NODE_PRIVATE(node);
1250 	priv2->so = so;
1251 	priv2->flags |= KSF_CLONED | KSF_EMBRYONIC;
1252 
1253 	/*
1254 	 * Insert the cloned node into a list of embryonic children
1255 	 * on the parent node.  When a hook is created on the cloned
1256 	 * node it will be removed from this list.  When the parent
1257 	 * is destroyed it will destroy any embryonic children it has.
1258 	 */
1259 	LIST_INSERT_HEAD(&priv->embryos, priv2, siblings);
1260 
1261 	so->so_upcallarg = (caddr_t)node;
1262 	so->so_upcall = ng_ksocket_incoming;
1263 	SOCKBUF_LOCK(&so->so_rcv);
1264 	so->so_rcv.sb_flags |= SB_UPCALL;
1265 	SOCKBUF_UNLOCK(&so->so_rcv);
1266 	SOCKBUF_LOCK(&so->so_snd);
1267 	so->so_snd.sb_flags |= SB_UPCALL;
1268 	SOCKBUF_UNLOCK(&so->so_snd);
1269 
1270 	/* Fill in the response data and send it or return it to the caller */
1271 	resp_data = (struct ng_ksocket_accept *)resp->data;
1272 	resp_data->nodeid = NG_NODE_ID(node);
1273 	if (sa != NULL)
1274 		bcopy(sa, &resp_data->addr, sa->sa_len);
1275 	NG_SEND_MSG_ID(error, node, resp, priv->response_addr, 0);
1276 
1277 out:
1278 	if (sa != NULL)
1279 		FREE(sa, M_SONAME);
1280 }
1281 
1282 /*
1283  * Parse out either an integer value or an alias.
1284  */
1285 static int
1286 ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
1287 	const char *s, int family)
1288 {
1289 	int k, val;
1290 	char *eptr;
1291 
1292 	/* Try aliases */
1293 	for (k = 0; aliases[k].name != NULL; k++) {
1294 		if (strcmp(s, aliases[k].name) == 0
1295 		    && aliases[k].family == family)
1296 			return aliases[k].value;
1297 	}
1298 
1299 	/* Try parsing as a number */
1300 	val = (int)strtoul(s, &eptr, 10);
1301 	if (val < 0 || *eptr != '\0')
1302 		return (-1);
1303 	return (val);
1304 }
1305 
1306