xref: /freebsd/sys/netgraph/ng_ksocket.c (revision 5748b897da441d1f10e1fe0c39155ea33d6d383a)
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 <netinet/ip.h>
70 #include <netatalk/at.h>
71 
72 #ifdef NG_SEPARATE_MALLOC
73 static MALLOC_DEFINE(M_NETGRAPH_KSOCKET, "netgraph_ksock",
74     "netgraph ksock node");
75 #else
76 #define M_NETGRAPH_KSOCKET M_NETGRAPH
77 #endif
78 
79 #define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0))
80 #define SADATA_OFFSET	(OFFSETOF(struct sockaddr, sa_data))
81 
82 /* Node private data */
83 struct ng_ksocket_private {
84 	node_p		node;
85 	hook_p		hook;
86 	struct socket	*so;
87 	int		fn_sent;	/* FN call on incoming event was sent */
88 	LIST_HEAD(, ng_ksocket_private)	embryos;
89 	LIST_ENTRY(ng_ksocket_private)	siblings;
90 	u_int32_t	flags;
91 	u_int32_t	response_token;
92 	ng_ID_t		response_addr;
93 };
94 typedef struct ng_ksocket_private *priv_p;
95 
96 /* Flags for priv_p */
97 #define	KSF_CONNECTING	0x00000001	/* Waiting for connection complete */
98 #define	KSF_ACCEPTING	0x00000002	/* Waiting for accept complete */
99 #define	KSF_EOFSEEN	0x00000004	/* Have sent 0-length EOF mbuf */
100 #define	KSF_CLONED	0x00000008	/* Cloned from an accepting socket */
101 #define	KSF_EMBRYONIC	0x00000010	/* Cloned node with no hooks yet */
102 
103 /* Netgraph node methods */
104 static ng_constructor_t	ng_ksocket_constructor;
105 static ng_rcvmsg_t	ng_ksocket_rcvmsg;
106 static ng_shutdown_t	ng_ksocket_shutdown;
107 static ng_newhook_t	ng_ksocket_newhook;
108 static ng_rcvdata_t	ng_ksocket_rcvdata;
109 static ng_connect_t	ng_ksocket_connect;
110 static ng_disconnect_t	ng_ksocket_disconnect;
111 
112 /* Alias structure */
113 struct ng_ksocket_alias {
114 	const char	*name;
115 	const int	value;
116 	const int	family;
117 };
118 
119 /* Protocol family aliases */
120 static const struct ng_ksocket_alias ng_ksocket_families[] = {
121 	{ "local",	PF_LOCAL	},
122 	{ "inet",	PF_INET		},
123 	{ "inet6",	PF_INET6	},
124 	{ "atalk",	PF_APPLETALK	},
125 	{ "ipx",	PF_IPX		},
126 	{ "atm",	PF_ATM		},
127 	{ NULL,		-1		},
128 };
129 
130 /* Socket type aliases */
131 static const struct ng_ksocket_alias ng_ksocket_types[] = {
132 	{ "stream",	SOCK_STREAM	},
133 	{ "dgram",	SOCK_DGRAM	},
134 	{ "raw",	SOCK_RAW	},
135 	{ "rdm",	SOCK_RDM	},
136 	{ "seqpacket",	SOCK_SEQPACKET	},
137 	{ NULL,		-1		},
138 };
139 
140 /* Protocol aliases */
141 static const struct ng_ksocket_alias ng_ksocket_protos[] = {
142 	{ "ip",		IPPROTO_IP,		PF_INET		},
143 	{ "raw",	IPPROTO_RAW,		PF_INET		},
144 	{ "icmp",	IPPROTO_ICMP,		PF_INET		},
145 	{ "igmp",	IPPROTO_IGMP,		PF_INET		},
146 	{ "tcp",	IPPROTO_TCP,		PF_INET		},
147 	{ "udp",	IPPROTO_UDP,		PF_INET		},
148 	{ "gre",	IPPROTO_GRE,		PF_INET		},
149 	{ "esp",	IPPROTO_ESP,		PF_INET		},
150 	{ "ah",		IPPROTO_AH,		PF_INET		},
151 	{ "swipe",	IPPROTO_SWIPE,		PF_INET		},
152 	{ "encap",	IPPROTO_ENCAP,		PF_INET		},
153 	{ "divert",	IPPROTO_DIVERT,		PF_INET		},
154 	{ "pim",	IPPROTO_PIM,		PF_INET		},
155 	{ "ddp",	ATPROTO_DDP,		PF_APPLETALK	},
156 	{ "aarp",	ATPROTO_AARP,		PF_APPLETALK	},
157 	{ NULL,		-1					},
158 };
159 
160 /* Helper functions */
161 static int	ng_ksocket_check_accept(priv_p);
162 static void	ng_ksocket_finish_accept(priv_p);
163 static int	ng_ksocket_incoming(struct socket *so, void *arg, int waitflag);
164 static int	ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
165 			const char *s, int family);
166 static void	ng_ksocket_incoming2(node_p node, hook_p hook,
167 			void *arg1, int arg2);
168 
169 /************************************************************************
170 			STRUCT SOCKADDR PARSE TYPE
171  ************************************************************************/
172 
173 /* Get the length of the data portion of a generic struct sockaddr */
174 static int
175 ng_parse_generic_sockdata_getLength(const struct ng_parse_type *type,
176 	const u_char *start, const u_char *buf)
177 {
178 	const struct sockaddr *sa;
179 
180 	sa = (const struct sockaddr *)(buf - SADATA_OFFSET);
181 	return (sa->sa_len < SADATA_OFFSET) ? 0 : sa->sa_len - SADATA_OFFSET;
182 }
183 
184 /* Type for the variable length data portion of a generic struct sockaddr */
185 static const struct ng_parse_type ng_ksocket_generic_sockdata_type = {
186 	&ng_parse_bytearray_type,
187 	&ng_parse_generic_sockdata_getLength
188 };
189 
190 /* Type for a generic struct sockaddr */
191 static const struct ng_parse_struct_field
192     ng_parse_generic_sockaddr_type_fields[] = {
193 	  { "len",	&ng_parse_uint8_type			},
194 	  { "family",	&ng_parse_uint8_type			},
195 	  { "data",	&ng_ksocket_generic_sockdata_type	},
196 	  { NULL }
197 };
198 static const struct ng_parse_type ng_ksocket_generic_sockaddr_type = {
199 	&ng_parse_struct_type,
200 	&ng_parse_generic_sockaddr_type_fields
201 };
202 
203 /* Convert a struct sockaddr from ASCII to binary.  If its a protocol
204    family that we specially handle, do that, otherwise defer to the
205    generic parse type ng_ksocket_generic_sockaddr_type. */
206 static int
207 ng_ksocket_sockaddr_parse(const struct ng_parse_type *type,
208 	const char *s, int *off, const u_char *const start,
209 	u_char *const buf, int *buflen)
210 {
211 	struct sockaddr *const sa = (struct sockaddr *)buf;
212 	enum ng_parse_token tok;
213 	char fambuf[32];
214 	int family, len;
215 	char *t;
216 
217 	/* If next token is a left curly brace, use generic parse type */
218 	if ((tok = ng_parse_get_token(s, off, &len)) == T_LBRACE) {
219 		return (*ng_ksocket_generic_sockaddr_type.supertype->parse)
220 		    (&ng_ksocket_generic_sockaddr_type,
221 		    s, off, start, buf, buflen);
222 	}
223 
224 	/* Get socket address family followed by a slash */
225 	while (isspace(s[*off]))
226 		(*off)++;
227 	if ((t = strchr(s + *off, '/')) == NULL)
228 		return (EINVAL);
229 	if ((len = t - (s + *off)) > sizeof(fambuf) - 1)
230 		return (EINVAL);
231 	strncpy(fambuf, s + *off, len);
232 	fambuf[len] = '\0';
233 	*off += len + 1;
234 	if ((family = ng_ksocket_parse(ng_ksocket_families, fambuf, 0)) == -1)
235 		return (EINVAL);
236 
237 	/* Set family */
238 	if (*buflen < SADATA_OFFSET)
239 		return (ERANGE);
240 	sa->sa_family = family;
241 
242 	/* Set family-specific data and length */
243 	switch (sa->sa_family) {
244 	case PF_LOCAL:		/* Get pathname */
245 	    {
246 		const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
247 		struct sockaddr_un *const sun = (struct sockaddr_un *)sa;
248 		int toklen, pathlen;
249 		char *path;
250 
251 		if ((path = ng_get_string_token(s, off, &toklen, NULL)) == NULL)
252 			return (EINVAL);
253 		pathlen = strlen(path);
254 		if (pathlen > SOCK_MAXADDRLEN) {
255 			free(path, M_NETGRAPH_KSOCKET);
256 			return (E2BIG);
257 		}
258 		if (*buflen < pathoff + pathlen) {
259 			free(path, M_NETGRAPH_KSOCKET);
260 			return (ERANGE);
261 		}
262 		*off += toklen;
263 		bcopy(path, sun->sun_path, pathlen);
264 		sun->sun_len = pathoff + pathlen;
265 		free(path, M_NETGRAPH_KSOCKET);
266 		break;
267 	    }
268 
269 	case PF_INET:		/* Get an IP address with optional port */
270 	    {
271 		struct sockaddr_in *const sin = (struct sockaddr_in *)sa;
272 		int i;
273 
274 		/* Parse this: <ipaddress>[:port] */
275 		for (i = 0; i < 4; i++) {
276 			u_long val;
277 			char *eptr;
278 
279 			val = strtoul(s + *off, &eptr, 10);
280 			if (val > 0xff || eptr == s + *off)
281 				return (EINVAL);
282 			*off += (eptr - (s + *off));
283 			((u_char *)&sin->sin_addr)[i] = (u_char)val;
284 			if (i < 3) {
285 				if (s[*off] != '.')
286 					return (EINVAL);
287 				(*off)++;
288 			} else if (s[*off] == ':') {
289 				(*off)++;
290 				val = strtoul(s + *off, &eptr, 10);
291 				if (val > 0xffff || eptr == s + *off)
292 					return (EINVAL);
293 				*off += (eptr - (s + *off));
294 				sin->sin_port = htons(val);
295 			} else
296 				sin->sin_port = 0;
297 		}
298 		bzero(&sin->sin_zero, sizeof(sin->sin_zero));
299 		sin->sin_len = sizeof(*sin);
300 		break;
301 	    }
302 
303 #if 0
304 	case PF_APPLETALK:	/* XXX implement these someday */
305 	case PF_INET6:
306 	case PF_IPX:
307 #endif
308 
309 	default:
310 		return (EINVAL);
311 	}
312 
313 	/* Done */
314 	*buflen = sa->sa_len;
315 	return (0);
316 }
317 
318 /* Convert a struct sockaddr from binary to ASCII */
319 static int
320 ng_ksocket_sockaddr_unparse(const struct ng_parse_type *type,
321 	const u_char *data, int *off, char *cbuf, int cbuflen)
322 {
323 	const struct sockaddr *sa = (const struct sockaddr *)(data + *off);
324 	int slen = 0;
325 
326 	/* Output socket address, either in special or generic format */
327 	switch (sa->sa_family) {
328 	case PF_LOCAL:
329 	    {
330 		const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
331 		const struct sockaddr_un *sun = (const struct sockaddr_un *)sa;
332 		const int pathlen = sun->sun_len - pathoff;
333 		char pathbuf[SOCK_MAXADDRLEN + 1];
334 		char *pathtoken;
335 
336 		bcopy(sun->sun_path, pathbuf, pathlen);
337 		if ((pathtoken = ng_encode_string(pathbuf, pathlen)) == NULL)
338 			return (ENOMEM);
339 		slen += snprintf(cbuf, cbuflen, "local/%s", pathtoken);
340 		free(pathtoken, M_NETGRAPH_KSOCKET);
341 		if (slen >= cbuflen)
342 			return (ERANGE);
343 		*off += sun->sun_len;
344 		return (0);
345 	    }
346 
347 	case PF_INET:
348 	    {
349 		const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
350 
351 		slen += snprintf(cbuf, cbuflen, "inet/%d.%d.%d.%d",
352 		  ((const u_char *)&sin->sin_addr)[0],
353 		  ((const u_char *)&sin->sin_addr)[1],
354 		  ((const u_char *)&sin->sin_addr)[2],
355 		  ((const u_char *)&sin->sin_addr)[3]);
356 		if (sin->sin_port != 0) {
357 			slen += snprintf(cbuf + strlen(cbuf),
358 			    cbuflen - strlen(cbuf), ":%d",
359 			    (u_int)ntohs(sin->sin_port));
360 		}
361 		if (slen >= cbuflen)
362 			return (ERANGE);
363 		*off += sizeof(*sin);
364 		return(0);
365 	    }
366 
367 #if 0
368 	case PF_APPLETALK:	/* XXX implement these someday */
369 	case PF_INET6:
370 	case PF_IPX:
371 #endif
372 
373 	default:
374 		return (*ng_ksocket_generic_sockaddr_type.supertype->unparse)
375 		    (&ng_ksocket_generic_sockaddr_type,
376 		    data, off, cbuf, cbuflen);
377 	}
378 }
379 
380 /* Parse type for struct sockaddr */
381 static const struct ng_parse_type ng_ksocket_sockaddr_type = {
382 	NULL,
383 	NULL,
384 	NULL,
385 	&ng_ksocket_sockaddr_parse,
386 	&ng_ksocket_sockaddr_unparse,
387 	NULL		/* no such thing as a default struct sockaddr */
388 };
389 
390 /************************************************************************
391 		STRUCT NG_KSOCKET_SOCKOPT PARSE TYPE
392  ************************************************************************/
393 
394 /* Get length of the struct ng_ksocket_sockopt value field, which is the
395    just the excess of the message argument portion over the length of
396    the struct ng_ksocket_sockopt. */
397 static int
398 ng_parse_sockoptval_getLength(const struct ng_parse_type *type,
399 	const u_char *start, const u_char *buf)
400 {
401 	static const int offset = OFFSETOF(struct ng_ksocket_sockopt, value);
402 	const struct ng_ksocket_sockopt *sopt;
403 	const struct ng_mesg *msg;
404 
405 	sopt = (const struct ng_ksocket_sockopt *)(buf - offset);
406 	msg = (const struct ng_mesg *)((const u_char *)sopt - sizeof(*msg));
407 	return msg->header.arglen - sizeof(*sopt);
408 }
409 
410 /* Parse type for the option value part of a struct ng_ksocket_sockopt
411    XXX Eventually, we should handle the different socket options specially.
412    XXX This would avoid byte order problems, eg an integer value of 1 is
413    XXX going to be "[1]" for little endian or "[3=1]" for big endian. */
414 static const struct ng_parse_type ng_ksocket_sockoptval_type = {
415 	&ng_parse_bytearray_type,
416 	&ng_parse_sockoptval_getLength
417 };
418 
419 /* Parse type for struct ng_ksocket_sockopt */
420 static const struct ng_parse_struct_field ng_ksocket_sockopt_type_fields[]
421 	= NG_KSOCKET_SOCKOPT_INFO(&ng_ksocket_sockoptval_type);
422 static const struct ng_parse_type ng_ksocket_sockopt_type = {
423 	&ng_parse_struct_type,
424 	&ng_ksocket_sockopt_type_fields
425 };
426 
427 /* Parse type for struct ng_ksocket_accept */
428 static const struct ng_parse_struct_field ng_ksocket_accept_type_fields[]
429 	= NGM_KSOCKET_ACCEPT_INFO;
430 static const struct ng_parse_type ng_ksocket_accept_type = {
431 	&ng_parse_struct_type,
432 	&ng_ksocket_accept_type_fields
433 };
434 
435 /* List of commands and how to convert arguments to/from ASCII */
436 static const struct ng_cmdlist ng_ksocket_cmds[] = {
437 	{
438 	  NGM_KSOCKET_COOKIE,
439 	  NGM_KSOCKET_BIND,
440 	  "bind",
441 	  &ng_ksocket_sockaddr_type,
442 	  NULL
443 	},
444 	{
445 	  NGM_KSOCKET_COOKIE,
446 	  NGM_KSOCKET_LISTEN,
447 	  "listen",
448 	  &ng_parse_int32_type,
449 	  NULL
450 	},
451 	{
452 	  NGM_KSOCKET_COOKIE,
453 	  NGM_KSOCKET_ACCEPT,
454 	  "accept",
455 	  NULL,
456 	  &ng_ksocket_accept_type
457 	},
458 	{
459 	  NGM_KSOCKET_COOKIE,
460 	  NGM_KSOCKET_CONNECT,
461 	  "connect",
462 	  &ng_ksocket_sockaddr_type,
463 	  &ng_parse_int32_type
464 	},
465 	{
466 	  NGM_KSOCKET_COOKIE,
467 	  NGM_KSOCKET_GETNAME,
468 	  "getname",
469 	  NULL,
470 	  &ng_ksocket_sockaddr_type
471 	},
472 	{
473 	  NGM_KSOCKET_COOKIE,
474 	  NGM_KSOCKET_GETPEERNAME,
475 	  "getpeername",
476 	  NULL,
477 	  &ng_ksocket_sockaddr_type
478 	},
479 	{
480 	  NGM_KSOCKET_COOKIE,
481 	  NGM_KSOCKET_SETOPT,
482 	  "setopt",
483 	  &ng_ksocket_sockopt_type,
484 	  NULL
485 	},
486 	{
487 	  NGM_KSOCKET_COOKIE,
488 	  NGM_KSOCKET_GETOPT,
489 	  "getopt",
490 	  &ng_ksocket_sockopt_type,
491 	  &ng_ksocket_sockopt_type
492 	},
493 	{ 0 }
494 };
495 
496 /* Node type descriptor */
497 static struct ng_type ng_ksocket_typestruct = {
498 	.version =	NG_ABI_VERSION,
499 	.name =		NG_KSOCKET_NODE_TYPE,
500 	.constructor =	ng_ksocket_constructor,
501 	.rcvmsg =	ng_ksocket_rcvmsg,
502 	.shutdown =	ng_ksocket_shutdown,
503 	.newhook =	ng_ksocket_newhook,
504 	.connect =	ng_ksocket_connect,
505 	.rcvdata =	ng_ksocket_rcvdata,
506 	.disconnect =	ng_ksocket_disconnect,
507 	.cmdlist =	ng_ksocket_cmds,
508 };
509 NETGRAPH_INIT(ksocket, &ng_ksocket_typestruct);
510 
511 #define ERROUT(x)	do { error = (x); goto done; } while (0)
512 
513 /************************************************************************
514 			NETGRAPH NODE STUFF
515  ************************************************************************/
516 
517 /*
518  * Node type constructor
519  * The NODE part is assumed to be all set up.
520  * There is already a reference to the node for us.
521  */
522 static int
523 ng_ksocket_constructor(node_p node)
524 {
525 	priv_p priv;
526 
527 	/* Allocate private structure */
528 	priv = malloc(sizeof(*priv), M_NETGRAPH_KSOCKET, M_NOWAIT | M_ZERO);
529 	if (priv == NULL)
530 		return (ENOMEM);
531 
532 	LIST_INIT(&priv->embryos);
533 	/* cross link them */
534 	priv->node = node;
535 	NG_NODE_SET_PRIVATE(node, priv);
536 
537 	/* Done */
538 	return (0);
539 }
540 
541 /*
542  * Give our OK for a hook to be added. The hook name is of the
543  * form "<family>/<type>/<proto>" where the three components may
544  * be decimal numbers or else aliases from the above lists.
545  *
546  * Connecting a hook amounts to opening the socket.  Disconnecting
547  * the hook closes the socket and destroys the node as well.
548  */
549 static int
550 ng_ksocket_newhook(node_p node, hook_p hook, const char *name0)
551 {
552 	struct thread *td = curthread;	/* XXX broken */
553 	const priv_p priv = NG_NODE_PRIVATE(node);
554 	char *s1, *s2, name[NG_HOOKSIZ];
555 	int family, type, protocol, error;
556 
557 	/* Check if we're already connected */
558 	if (priv->hook != NULL)
559 		return (EISCONN);
560 
561 	if (priv->flags & KSF_CLONED) {
562 		if (priv->flags & KSF_EMBRYONIC) {
563 			/* Remove ourselves from our parent's embryo list */
564 			LIST_REMOVE(priv, siblings);
565 			priv->flags &= ~KSF_EMBRYONIC;
566 		}
567 	} else {
568 		/* Extract family, type, and protocol from hook name */
569 		snprintf(name, sizeof(name), "%s", name0);
570 		s1 = name;
571 		if ((s2 = strchr(s1, '/')) == NULL)
572 			return (EINVAL);
573 		*s2++ = '\0';
574 		family = ng_ksocket_parse(ng_ksocket_families, s1, 0);
575 		if (family == -1)
576 			return (EINVAL);
577 		s1 = s2;
578 		if ((s2 = strchr(s1, '/')) == NULL)
579 			return (EINVAL);
580 		*s2++ = '\0';
581 		type = ng_ksocket_parse(ng_ksocket_types, s1, 0);
582 		if (type == -1)
583 			return (EINVAL);
584 		s1 = s2;
585 		protocol = ng_ksocket_parse(ng_ksocket_protos, s1, family);
586 		if (protocol == -1)
587 			return (EINVAL);
588 
589 		/* Create the socket */
590 		error = socreate(family, &priv->so, type, protocol,
591 		   td->td_ucred, td);
592 		if (error != 0)
593 			return (error);
594 
595 		/* XXX call soreserve() ? */
596 
597 	}
598 
599 	/* OK */
600 	priv->hook = hook;
601 
602 	/*
603 	 * In case of misconfigured routing a packet may reenter
604 	 * ksocket node recursively. Decouple stack to avoid possible
605 	 * panics about sleeping with locks held.
606 	 */
607 	NG_HOOK_FORCE_QUEUE(hook);
608 
609 	return(0);
610 }
611 
612 static int
613 ng_ksocket_connect(hook_p hook)
614 {
615 	node_p node = NG_HOOK_NODE(hook);
616 	const priv_p priv = NG_NODE_PRIVATE(node);
617 	struct socket *const so = priv->so;
618 
619 	/* Add our hook for incoming data and other events */
620 	SOCKBUF_LOCK(&priv->so->so_rcv);
621 	soupcall_set(priv->so, SO_RCV, ng_ksocket_incoming, node);
622 	SOCKBUF_UNLOCK(&priv->so->so_rcv);
623 	SOCKBUF_LOCK(&priv->so->so_snd);
624 	soupcall_set(priv->so, SO_SND, ng_ksocket_incoming, node);
625 	SOCKBUF_UNLOCK(&priv->so->so_snd);
626 	SOCK_LOCK(priv->so);
627 	priv->so->so_state |= SS_NBIO;
628 	SOCK_UNLOCK(priv->so);
629 	/*
630 	 * --Original comment--
631 	 * On a cloned socket we may have already received one or more
632 	 * upcalls which we couldn't handle without a hook.  Handle
633 	 * those now.
634 	 * We cannot call the upcall function directly
635 	 * from here, because until this function has returned our
636 	 * hook isn't connected.
637 	 *
638 	 * ---meta comment for -current ---
639 	 * XXX This is dubius.
640 	 * Upcalls between the time that the hook was
641 	 * first created and now (on another processesor) will
642 	 * be earlier on the queue than the request to finalise the hook.
643 	 * By the time the hook is finalised,
644 	 * The queued upcalls will have happenned and the code
645 	 * will have discarded them because of a lack of a hook.
646 	 * (socket not open).
647 	 *
648 	 * This is a bad byproduct of the complicated way in which hooks
649 	 * are now created (3 daisy chained async events).
650 	 *
651 	 * Since we are a netgraph operation
652 	 * We know that we hold a lock on this node. This forces the
653 	 * request we make below to be queued rather than implemented
654 	 * immediatly which will cause the upcall function to be called a bit
655 	 * later.
656 	 * However, as we will run any waiting queued operations immediatly
657 	 * after doing this one, if we have not finalised the other end
658 	 * of the hook, those queued operations will fail.
659 	 */
660 	if (priv->flags & KSF_CLONED) {
661 		ng_send_fn(node, NULL, &ng_ksocket_incoming2, so, M_NOWAIT);
662 	}
663 
664 	return (0);
665 }
666 
667 /*
668  * Receive a control message
669  */
670 static int
671 ng_ksocket_rcvmsg(node_p node, item_p item, hook_p lasthook)
672 {
673 	struct thread *td = curthread;	/* XXX broken */
674 	const priv_p priv = NG_NODE_PRIVATE(node);
675 	struct socket *const so = priv->so;
676 	struct ng_mesg *resp = NULL;
677 	int error = 0;
678 	struct ng_mesg *msg;
679 	ng_ID_t raddr;
680 
681 	NGI_GET_MSG(item, msg);
682 	switch (msg->header.typecookie) {
683 	case NGM_KSOCKET_COOKIE:
684 		switch (msg->header.cmd) {
685 		case NGM_KSOCKET_BIND:
686 		    {
687 			struct sockaddr *const sa
688 			    = (struct sockaddr *)msg->data;
689 
690 			/* Sanity check */
691 			if (msg->header.arglen < SADATA_OFFSET
692 			    || msg->header.arglen < sa->sa_len)
693 				ERROUT(EINVAL);
694 			if (so == NULL)
695 				ERROUT(ENXIO);
696 
697 			/* Bind */
698 			error = sobind(so, sa, td);
699 			break;
700 		    }
701 		case NGM_KSOCKET_LISTEN:
702 		    {
703 			/* Sanity check */
704 			if (msg->header.arglen != sizeof(int32_t))
705 				ERROUT(EINVAL);
706 			if (so == NULL)
707 				ERROUT(ENXIO);
708 
709 			/* Listen */
710 			error = solisten(so, *((int32_t *)msg->data), td);
711 			break;
712 		    }
713 
714 		case NGM_KSOCKET_ACCEPT:
715 		    {
716 			/* Sanity check */
717 			if (msg->header.arglen != 0)
718 				ERROUT(EINVAL);
719 			if (so == NULL)
720 				ERROUT(ENXIO);
721 
722 			/* Make sure the socket is capable of accepting */
723 			if (!(so->so_options & SO_ACCEPTCONN))
724 				ERROUT(EINVAL);
725 			if (priv->flags & KSF_ACCEPTING)
726 				ERROUT(EALREADY);
727 
728 			error = ng_ksocket_check_accept(priv);
729 			if (error != 0 && error != EWOULDBLOCK)
730 				ERROUT(error);
731 
732 			/*
733 			 * If a connection is already complete, take it.
734 			 * Otherwise let the upcall function deal with
735 			 * the connection when it comes in.
736 			 */
737 			priv->response_token = msg->header.token;
738 			raddr = priv->response_addr = NGI_RETADDR(item);
739 			if (error == 0) {
740 				ng_ksocket_finish_accept(priv);
741 			} else
742 				priv->flags |= KSF_ACCEPTING;
743 			break;
744 		    }
745 
746 		case NGM_KSOCKET_CONNECT:
747 		    {
748 			struct sockaddr *const sa
749 			    = (struct sockaddr *)msg->data;
750 
751 			/* Sanity check */
752 			if (msg->header.arglen < SADATA_OFFSET
753 			    || msg->header.arglen < sa->sa_len)
754 				ERROUT(EINVAL);
755 			if (so == NULL)
756 				ERROUT(ENXIO);
757 
758 			/* Do connect */
759 			if ((so->so_state & SS_ISCONNECTING) != 0)
760 				ERROUT(EALREADY);
761 			if ((error = soconnect(so, sa, td)) != 0) {
762 				so->so_state &= ~SS_ISCONNECTING;
763 				ERROUT(error);
764 			}
765 			if ((so->so_state & SS_ISCONNECTING) != 0) {
766 				/* We will notify the sender when we connect */
767 				priv->response_token = msg->header.token;
768 				raddr = priv->response_addr = NGI_RETADDR(item);
769 				priv->flags |= KSF_CONNECTING;
770 				ERROUT(EINPROGRESS);
771 			}
772 			break;
773 		    }
774 
775 		case NGM_KSOCKET_GETNAME:
776 		case NGM_KSOCKET_GETPEERNAME:
777 		    {
778 			int (*func)(struct socket *so, struct sockaddr **nam);
779 			struct sockaddr *sa = NULL;
780 			int len;
781 
782 			/* Sanity check */
783 			if (msg->header.arglen != 0)
784 				ERROUT(EINVAL);
785 			if (so == NULL)
786 				ERROUT(ENXIO);
787 
788 			/* Get function */
789 			if (msg->header.cmd == NGM_KSOCKET_GETPEERNAME) {
790 				if ((so->so_state
791 				    & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0)
792 					ERROUT(ENOTCONN);
793 				func = so->so_proto->pr_usrreqs->pru_peeraddr;
794 			} else
795 				func = so->so_proto->pr_usrreqs->pru_sockaddr;
796 
797 			/* Get local or peer address */
798 			if ((error = (*func)(so, &sa)) != 0)
799 				goto bail;
800 			len = (sa == NULL) ? 0 : sa->sa_len;
801 
802 			/* Send it back in a response */
803 			NG_MKRESPONSE(resp, msg, len, M_NOWAIT);
804 			if (resp == NULL) {
805 				error = ENOMEM;
806 				goto bail;
807 			}
808 			bcopy(sa, resp->data, len);
809 
810 		bail:
811 			/* Cleanup */
812 			if (sa != NULL)
813 				free(sa, M_SONAME);
814 			break;
815 		    }
816 
817 		case NGM_KSOCKET_GETOPT:
818 		    {
819 			struct ng_ksocket_sockopt *ksopt =
820 			    (struct ng_ksocket_sockopt *)msg->data;
821 			struct sockopt sopt;
822 
823 			/* Sanity check */
824 			if (msg->header.arglen != sizeof(*ksopt))
825 				ERROUT(EINVAL);
826 			if (so == NULL)
827 				ERROUT(ENXIO);
828 
829 			/* Get response with room for option value */
830 			NG_MKRESPONSE(resp, msg, sizeof(*ksopt)
831 			    + NG_KSOCKET_MAX_OPTLEN, M_NOWAIT);
832 			if (resp == NULL)
833 				ERROUT(ENOMEM);
834 
835 			/* Get socket option, and put value in the response */
836 			sopt.sopt_dir = SOPT_GET;
837 			sopt.sopt_level = ksopt->level;
838 			sopt.sopt_name = ksopt->name;
839 			sopt.sopt_td = NULL;
840 			sopt.sopt_valsize = NG_KSOCKET_MAX_OPTLEN;
841 			ksopt = (struct ng_ksocket_sockopt *)resp->data;
842 			sopt.sopt_val = ksopt->value;
843 			if ((error = sogetopt(so, &sopt)) != 0) {
844 				NG_FREE_MSG(resp);
845 				break;
846 			}
847 
848 			/* Set actual value length */
849 			resp->header.arglen = sizeof(*ksopt)
850 			    + sopt.sopt_valsize;
851 			break;
852 		    }
853 
854 		case NGM_KSOCKET_SETOPT:
855 		    {
856 			struct ng_ksocket_sockopt *const ksopt =
857 			    (struct ng_ksocket_sockopt *)msg->data;
858 			const int valsize = msg->header.arglen - sizeof(*ksopt);
859 			struct sockopt sopt;
860 
861 			/* Sanity check */
862 			if (valsize < 0)
863 				ERROUT(EINVAL);
864 			if (so == NULL)
865 				ERROUT(ENXIO);
866 
867 			/* Set socket option */
868 			sopt.sopt_dir = SOPT_SET;
869 			sopt.sopt_level = ksopt->level;
870 			sopt.sopt_name = ksopt->name;
871 			sopt.sopt_val = ksopt->value;
872 			sopt.sopt_valsize = valsize;
873 			sopt.sopt_td = NULL;
874 			error = sosetopt(so, &sopt);
875 			break;
876 		    }
877 
878 		default:
879 			error = EINVAL;
880 			break;
881 		}
882 		break;
883 	default:
884 		error = EINVAL;
885 		break;
886 	}
887 done:
888 	NG_RESPOND_MSG(error, node, item, resp);
889 	NG_FREE_MSG(msg);
890 	return (error);
891 }
892 
893 /*
894  * Receive incoming data on our hook.  Send it out the socket.
895  */
896 static int
897 ng_ksocket_rcvdata(hook_p hook, item_p item)
898 {
899 	struct thread *td = curthread;	/* XXX broken */
900 	const node_p node = NG_HOOK_NODE(hook);
901 	const priv_p priv = NG_NODE_PRIVATE(node);
902 	struct socket *const so = priv->so;
903 	struct sockaddr *sa = NULL;
904 	int error;
905 	struct mbuf *m;
906 #ifdef ALIGNED_POINTER
907 	struct mbuf *n;
908 #endif /* ALIGNED_POINTER */
909 	struct sa_tag *stag;
910 
911 	/* Extract data */
912 	NGI_GET_M(item, m);
913 	NG_FREE_ITEM(item);
914 #ifdef ALIGNED_POINTER
915 	if (!ALIGNED_POINTER(mtod(m, caddr_t), uint32_t)) {
916 		n = m_defrag(m, M_NOWAIT);
917 		if (n == NULL) {
918 			m_freem(m);
919 			return (ENOBUFS);
920 		}
921 		m = n;
922 	}
923 #endif /* ALIGNED_POINTER */
924 	/*
925 	 * Look if socket address is stored in packet tags.
926 	 * If sockaddr is ours, or provided by a third party (zero id),
927 	 * then we accept it.
928 	 */
929 	if (((stag = (struct sa_tag *)m_tag_locate(m, NGM_KSOCKET_COOKIE,
930 	    NG_KSOCKET_TAG_SOCKADDR, NULL)) != NULL) &&
931 	    (stag->id == NG_NODE_ID(node) || stag->id == 0))
932 		sa = &stag->sa;
933 
934 	/* Reset specific mbuf flags to prevent addressing problems. */
935 	m->m_flags &= ~(M_BCAST|M_MCAST);
936 
937 	/* Send packet */
938 	error = sosend(so, sa, 0, m, 0, 0, td);
939 
940 	return (error);
941 }
942 
943 /*
944  * Destroy node
945  */
946 static int
947 ng_ksocket_shutdown(node_p node)
948 {
949 	const priv_p priv = NG_NODE_PRIVATE(node);
950 	priv_p embryo;
951 
952 	/* Close our socket (if any) */
953 	if (priv->so != NULL) {
954 		SOCKBUF_LOCK(&priv->so->so_rcv);
955 		soupcall_clear(priv->so, SO_RCV);
956 		SOCKBUF_UNLOCK(&priv->so->so_rcv);
957 		SOCKBUF_LOCK(&priv->so->so_snd);
958 		soupcall_clear(priv->so, SO_SND);
959 		SOCKBUF_UNLOCK(&priv->so->so_snd);
960 		soclose(priv->so);
961 		priv->so = NULL;
962 	}
963 
964 	/* If we are an embryo, take ourselves out of the parent's list */
965 	if (priv->flags & KSF_EMBRYONIC) {
966 		LIST_REMOVE(priv, siblings);
967 		priv->flags &= ~KSF_EMBRYONIC;
968 	}
969 
970 	/* Remove any embryonic children we have */
971 	while (!LIST_EMPTY(&priv->embryos)) {
972 		embryo = LIST_FIRST(&priv->embryos);
973 		ng_rmnode_self(embryo->node);
974 	}
975 
976 	/* Take down netgraph node */
977 	bzero(priv, sizeof(*priv));
978 	free(priv, M_NETGRAPH_KSOCKET);
979 	NG_NODE_SET_PRIVATE(node, NULL);
980 	NG_NODE_UNREF(node);		/* let the node escape */
981 	return (0);
982 }
983 
984 /*
985  * Hook disconnection
986  */
987 static int
988 ng_ksocket_disconnect(hook_p hook)
989 {
990 	KASSERT(NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0,
991 	    ("%s: numhooks=%d?", __func__,
992 	    NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook))));
993 	if (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))
994 		ng_rmnode_self(NG_HOOK_NODE(hook));
995 	return (0);
996 }
997 
998 /************************************************************************
999 			HELPER STUFF
1000  ************************************************************************/
1001 /*
1002  * You should not "just call" a netgraph node function from an external
1003  * asynchronous event. This is because in doing so you are ignoring the
1004  * locking on the netgraph nodes. Instead call your function via ng_send_fn().
1005  * This will call the function you chose, but will first do all the
1006  * locking rigmarole. Your function MAY only be called at some distant future
1007  * time (several millisecs away) so don't give it any arguments
1008  * that may be revoked soon (e.g. on your stack).
1009  *
1010  * To decouple stack, we use queue version of ng_send_fn().
1011  */
1012 
1013 static int
1014 ng_ksocket_incoming(struct socket *so, void *arg, int waitflag)
1015 {
1016 	const node_p node = arg;
1017 	const priv_p priv = NG_NODE_PRIVATE(node);
1018 	int wait = ((waitflag & M_WAITOK) ? NG_WAITOK : 0) | NG_QUEUE;
1019 
1020 	/*
1021 	 * Even if node is not locked, as soon as we are called, we assume
1022 	 * it exist and it's private area is valid. With some care we can
1023 	 * access it. Mark node that incoming event for it was sent to
1024 	 * avoid unneded queue trashing.
1025 	 */
1026 	if (atomic_cmpset_int(&priv->fn_sent, 0, 1) &&
1027 	    ng_send_fn1(node, NULL, &ng_ksocket_incoming2, so, 0, wait)) {
1028 		atomic_store_rel_int(&priv->fn_sent, 0);
1029 	}
1030 	return (SU_OK);
1031 }
1032 
1033 
1034 /*
1035  * When incoming data is appended to the socket, we get notified here.
1036  * This is also called whenever a significant event occurs for the socket.
1037  * Our original caller may have queued this even some time ago and
1038  * we cannot trust that he even still exists. The node however is being
1039  * held with a reference by the queueing code and guarantied to be valid.
1040  */
1041 static void
1042 ng_ksocket_incoming2(node_p node, hook_p hook, void *arg1, int arg2)
1043 {
1044 	struct socket *so = arg1;
1045 	const priv_p priv = NG_NODE_PRIVATE(node);
1046 	struct ng_mesg *response;
1047 	int error;
1048 
1049 	KASSERT(so == priv->so, ("%s: wrong socket", __func__));
1050 
1051 	/* Allow next incoming event to be queued. */
1052 	atomic_store_rel_int(&priv->fn_sent, 0);
1053 
1054 	/* Check whether a pending connect operation has completed */
1055 	if (priv->flags & KSF_CONNECTING) {
1056 		if ((error = so->so_error) != 0) {
1057 			so->so_error = 0;
1058 			so->so_state &= ~SS_ISCONNECTING;
1059 		}
1060 		if (!(so->so_state & SS_ISCONNECTING)) {
1061 			NG_MKMESSAGE(response, NGM_KSOCKET_COOKIE,
1062 			    NGM_KSOCKET_CONNECT, sizeof(int32_t), M_NOWAIT);
1063 			if (response != NULL) {
1064 				response->header.flags |= NGF_RESP;
1065 				response->header.token = priv->response_token;
1066 				*(int32_t *)response->data = error;
1067 				/*
1068 				 * send an async "response" message
1069 				 * to the node that set us up
1070 				 * (if it still exists)
1071 				 */
1072 				NG_SEND_MSG_ID(error, node,
1073 				    response, priv->response_addr, 0);
1074 			}
1075 			priv->flags &= ~KSF_CONNECTING;
1076 		}
1077 	}
1078 
1079 	/* Check whether a pending accept operation has completed */
1080 	if (priv->flags & KSF_ACCEPTING) {
1081 		error = ng_ksocket_check_accept(priv);
1082 		if (error != EWOULDBLOCK)
1083 			priv->flags &= ~KSF_ACCEPTING;
1084 		if (error == 0)
1085 			ng_ksocket_finish_accept(priv);
1086 	}
1087 
1088 	/*
1089 	 * If we don't have a hook, we must handle data events later.  When
1090 	 * the hook gets created and is connected, this upcall function
1091 	 * will be called again.
1092 	 */
1093 	if (priv->hook == NULL)
1094 		return;
1095 
1096 	/* Read and forward available mbufs. */
1097 	while (1) {
1098 		struct uio uio;
1099 		struct sockaddr *sa;
1100 		struct mbuf *m;
1101 		int flags;
1102 
1103 		/* Try to get next packet from socket. */
1104 		uio.uio_td = NULL;
1105 		uio.uio_resid = IP_MAXPACKET;
1106 		flags = MSG_DONTWAIT;
1107 		sa = NULL;
1108 		if ((error = soreceive(so, (so->so_state & SS_ISCONNECTED) ?
1109 		    NULL : &sa, &uio, &m, NULL, &flags)) != 0)
1110 			break;
1111 
1112 		/* See if we got anything. */
1113 		if (flags & MSG_TRUNC) {
1114 			m_freem(m);
1115 			m = NULL;
1116 		}
1117 		if (m == NULL) {
1118 			if (sa != NULL)
1119 				free(sa, M_SONAME);
1120 			break;
1121 		}
1122 
1123 		KASSERT(m->m_nextpkt == NULL, ("%s: nextpkt", __func__));
1124 
1125 		/*
1126 		 * Stream sockets do not have packet boundaries, so
1127 		 * we have to allocate a header mbuf and attach the
1128 		 * stream of data to it.
1129 		 */
1130 		if (so->so_type == SOCK_STREAM) {
1131 			struct mbuf *mh;
1132 
1133 			mh = m_gethdr(M_NOWAIT, MT_DATA);
1134 			if (mh == NULL) {
1135 				m_freem(m);
1136 				if (sa != NULL)
1137 					free(sa, M_SONAME);
1138 				break;
1139 			}
1140 
1141 			mh->m_next = m;
1142 			for (; m; m = m->m_next)
1143 				mh->m_pkthdr.len += m->m_len;
1144 			m = mh;
1145 		}
1146 
1147 		/* Put peer's socket address (if any) into a tag */
1148 		if (sa != NULL) {
1149 			struct sa_tag	*stag;
1150 
1151 			stag = (struct sa_tag *)m_tag_alloc(NGM_KSOCKET_COOKIE,
1152 			    NG_KSOCKET_TAG_SOCKADDR, sizeof(ng_ID_t) +
1153 			    sa->sa_len, M_NOWAIT);
1154 			if (stag == NULL) {
1155 				free(sa, M_SONAME);
1156 				goto sendit;
1157 			}
1158 			bcopy(sa, &stag->sa, sa->sa_len);
1159 			free(sa, M_SONAME);
1160 			stag->id = NG_NODE_ID(node);
1161 			m_tag_prepend(m, &stag->tag);
1162 		}
1163 
1164 sendit:		/* Forward data with optional peer sockaddr as packet tag */
1165 		NG_SEND_DATA_ONLY(error, priv->hook, m);
1166 	}
1167 
1168 	/*
1169 	 * If the peer has closed the connection, forward a 0-length mbuf
1170 	 * to indicate end-of-file.
1171 	 */
1172 	if (so->so_rcv.sb_state & SBS_CANTRCVMORE &&
1173 	    !(priv->flags & KSF_EOFSEEN)) {
1174 		struct mbuf *m;
1175 
1176 		m = m_gethdr(M_NOWAIT, MT_DATA);
1177 		if (m != NULL)
1178 			NG_SEND_DATA_ONLY(error, priv->hook, m);
1179 		priv->flags |= KSF_EOFSEEN;
1180 	}
1181 }
1182 
1183 /*
1184  * Check for a completed incoming connection and return 0 if one is found.
1185  * Otherwise return the appropriate error code.
1186  */
1187 static int
1188 ng_ksocket_check_accept(priv_p priv)
1189 {
1190 	struct socket *const head = priv->so;
1191 	int error;
1192 
1193 	if ((error = head->so_error) != 0) {
1194 		head->so_error = 0;
1195 		return error;
1196 	}
1197 	/* Unlocked read. */
1198 	if (TAILQ_EMPTY(&head->so_comp)) {
1199 		if (head->so_rcv.sb_state & SBS_CANTRCVMORE)
1200 			return ECONNABORTED;
1201 		return EWOULDBLOCK;
1202 	}
1203 	return 0;
1204 }
1205 
1206 /*
1207  * Handle the first completed incoming connection, assumed to be already
1208  * on the socket's so_comp queue.
1209  */
1210 static void
1211 ng_ksocket_finish_accept(priv_p priv)
1212 {
1213 	struct socket *const head = priv->so;
1214 	struct socket *so;
1215 	struct sockaddr *sa = NULL;
1216 	struct ng_mesg *resp;
1217 	struct ng_ksocket_accept *resp_data;
1218 	node_p node;
1219 	priv_p priv2;
1220 	int len;
1221 	int error;
1222 
1223 	ACCEPT_LOCK();
1224 	so = TAILQ_FIRST(&head->so_comp);
1225 	if (so == NULL) {	/* Should never happen */
1226 		ACCEPT_UNLOCK();
1227 		return;
1228 	}
1229 	TAILQ_REMOVE(&head->so_comp, so, so_list);
1230 	head->so_qlen--;
1231 	so->so_qstate &= ~SQ_COMP;
1232 	so->so_head = NULL;
1233 	SOCK_LOCK(so);
1234 	soref(so);
1235 	so->so_state |= SS_NBIO;
1236 	SOCK_UNLOCK(so);
1237 	ACCEPT_UNLOCK();
1238 
1239 	/* XXX KNOTE_UNLOCKED(&head->so_rcv.sb_sel.si_note, 0); */
1240 
1241 	soaccept(so, &sa);
1242 
1243 	len = OFFSETOF(struct ng_ksocket_accept, addr);
1244 	if (sa != NULL)
1245 		len += sa->sa_len;
1246 
1247 	NG_MKMESSAGE(resp, NGM_KSOCKET_COOKIE, NGM_KSOCKET_ACCEPT, len,
1248 	    M_NOWAIT);
1249 	if (resp == NULL) {
1250 		soclose(so);
1251 		goto out;
1252 	}
1253 	resp->header.flags |= NGF_RESP;
1254 	resp->header.token = priv->response_token;
1255 
1256 	/* Clone a ksocket node to wrap the new socket */
1257 	error = ng_make_node_common(&ng_ksocket_typestruct, &node);
1258 	if (error) {
1259 		free(resp, M_NETGRAPH);
1260 		soclose(so);
1261 		goto out;
1262 	}
1263 
1264 	if (ng_ksocket_constructor(node) != 0) {
1265 		NG_NODE_UNREF(node);
1266 		free(resp, M_NETGRAPH);
1267 		soclose(so);
1268 		goto out;
1269 	}
1270 
1271 	priv2 = NG_NODE_PRIVATE(node);
1272 	priv2->so = so;
1273 	priv2->flags |= KSF_CLONED | KSF_EMBRYONIC;
1274 
1275 	/*
1276 	 * Insert the cloned node into a list of embryonic children
1277 	 * on the parent node.  When a hook is created on the cloned
1278 	 * node it will be removed from this list.  When the parent
1279 	 * is destroyed it will destroy any embryonic children it has.
1280 	 */
1281 	LIST_INSERT_HEAD(&priv->embryos, priv2, siblings);
1282 
1283 	SOCKBUF_LOCK(&so->so_rcv);
1284 	soupcall_set(so, SO_RCV, ng_ksocket_incoming, node);
1285 	SOCKBUF_UNLOCK(&so->so_rcv);
1286 	SOCKBUF_LOCK(&so->so_snd);
1287 	soupcall_set(so, SO_SND, ng_ksocket_incoming, node);
1288 	SOCKBUF_UNLOCK(&so->so_snd);
1289 
1290 	/* Fill in the response data and send it or return it to the caller */
1291 	resp_data = (struct ng_ksocket_accept *)resp->data;
1292 	resp_data->nodeid = NG_NODE_ID(node);
1293 	if (sa != NULL)
1294 		bcopy(sa, &resp_data->addr, sa->sa_len);
1295 	NG_SEND_MSG_ID(error, node, resp, priv->response_addr, 0);
1296 
1297 out:
1298 	if (sa != NULL)
1299 		free(sa, M_SONAME);
1300 }
1301 
1302 /*
1303  * Parse out either an integer value or an alias.
1304  */
1305 static int
1306 ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
1307 	const char *s, int family)
1308 {
1309 	int k, val;
1310 	char *eptr;
1311 
1312 	/* Try aliases */
1313 	for (k = 0; aliases[k].name != NULL; k++) {
1314 		if (strcmp(s, aliases[k].name) == 0
1315 		    && aliases[k].family == family)
1316 			return aliases[k].value;
1317 	}
1318 
1319 	/* Try parsing as a number */
1320 	val = (int)strtoul(s, &eptr, 10);
1321 	if (val < 0 || *eptr != '\0')
1322 		return (-1);
1323 	return (val);
1324 }
1325 
1326