kernel/netgraph7: Replace usage of MALLOC/FREE with kmalloc/kfree here too.
[dragonfly.git] / sys / netgraph7 / ng_ksocket.c
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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: src/sys/netgraph/ng_ksocket.c,v 1.61 2008/03/07 21:12:56 mav Exp $
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
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63#include "ng_message.h"
64#include "netgraph.h"
65#include "ng_parse.h"
66#include "ng_ksocket.h"
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67
68#include <netinet/in.h>
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69
70#ifdef NG_SEPARATE_MALLOC
71MALLOC_DEFINE(M_NETGRAPH_KSOCKET, "netgraph_ksock", "netgraph ksock node ");
72#else
73#define M_NETGRAPH_KSOCKET M_NETGRAPH
74#endif
75
76#define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0))
77#define SADATA_OFFSET (OFFSETOF(struct sockaddr, sa_data))
78
79/* Node private data */
80struct ng_ksocket_private {
81 node_p node;
82 hook_p hook;
83 struct socket *so;
84 int fn_sent; /* FN call on incoming event was sent */
85 LIST_HEAD(, ng_ksocket_private) embryos;
86 LIST_ENTRY(ng_ksocket_private) siblings;
87 u_int32_t flags;
88 u_int32_t response_token;
89 ng_ID_t response_addr;
90};
91typedef struct ng_ksocket_private *priv_p;
92
93/* Flags for priv_p */
94#define KSF_CONNECTING 0x00000001 /* Waiting for connection complete */
95#define KSF_ACCEPTING 0x00000002 /* Waiting for accept complete */
96#define KSF_EOFSEEN 0x00000004 /* Have sent 0-length EOF mbuf */
97#define KSF_CLONED 0x00000008 /* Cloned from an accepting socket */
98#define KSF_EMBRYONIC 0x00000010 /* Cloned node with no hooks yet */
99
100/* Netgraph node methods */
101static ng_constructor_t ng_ksocket_constructor;
102static ng_rcvmsg_t ng_ksocket_rcvmsg;
103static ng_shutdown_t ng_ksocket_shutdown;
104static ng_newhook_t ng_ksocket_newhook;
105static ng_rcvdata_t ng_ksocket_rcvdata;
106static ng_connect_t ng_ksocket_connect;
107static ng_disconnect_t ng_ksocket_disconnect;
108
109/* Alias structure */
110struct ng_ksocket_alias {
111 const char *name;
112 const int value;
113 const int family;
114};
115
116/* Protocol family aliases */
117static const struct ng_ksocket_alias ng_ksocket_families[] = {
118 { "local", PF_LOCAL },
119 { "inet", PF_INET },
120 { "inet6", PF_INET6 },
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121 { "ipx", PF_IPX },
122 { "atm", PF_ATM },
123 { NULL, -1 },
124};
125
126/* Socket type aliases */
127static const struct ng_ksocket_alias ng_ksocket_types[] = {
128 { "stream", SOCK_STREAM },
129 { "dgram", SOCK_DGRAM },
130 { "raw", SOCK_RAW },
131 { "rdm", SOCK_RDM },
132 { "seqpacket", SOCK_SEQPACKET },
133 { NULL, -1 },
134};
135
136/* Protocol aliases */
137static const struct ng_ksocket_alias ng_ksocket_protos[] = {
138 { "ip", IPPROTO_IP, PF_INET },
139 { "raw", IPPROTO_RAW, PF_INET },
140 { "icmp", IPPROTO_ICMP, PF_INET },
141 { "igmp", IPPROTO_IGMP, PF_INET },
142 { "tcp", IPPROTO_TCP, PF_INET },
143 { "udp", IPPROTO_UDP, PF_INET },
144 { "gre", IPPROTO_GRE, PF_INET },
145 { "esp", IPPROTO_ESP, PF_INET },
146 { "ah", IPPROTO_AH, PF_INET },
147 { "swipe", IPPROTO_SWIPE, PF_INET },
148 { "encap", IPPROTO_ENCAP, PF_INET },
149 { "divert", IPPROTO_DIVERT, PF_INET },
150 { "pim", IPPROTO_PIM, PF_INET },
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151 { NULL, -1 },
152};
153
154/* Helper functions */
155static int ng_ksocket_check_accept(priv_p);
156static void ng_ksocket_finish_accept(priv_p);
157static void ng_ksocket_incoming(struct socket *so, void *arg, int waitflag);
158static int ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
159 const char *s, int family);
160static void ng_ksocket_incoming2(node_p node, hook_p hook,
161 void *arg1, int arg2);
162
163/************************************************************************
164 STRUCT SOCKADDR PARSE TYPE
165 ************************************************************************/
166
167/* Get the length of the data portion of a generic struct sockaddr */
168static int
169ng_parse_generic_sockdata_getLength(const struct ng_parse_type *type,
170 const u_char *start, const u_char *buf)
171{
172 const struct sockaddr *sa;
173
174 sa = (const struct sockaddr *)(buf - SADATA_OFFSET);
175 return (sa->sa_len < SADATA_OFFSET) ? 0 : sa->sa_len - SADATA_OFFSET;
176}
177
178/* Type for the variable length data portion of a generic struct sockaddr */
179static const struct ng_parse_type ng_ksocket_generic_sockdata_type = {
180 &ng_parse_bytearray_type,
181 &ng_parse_generic_sockdata_getLength
182};
183
184/* Type for a generic struct sockaddr */
185static const struct ng_parse_struct_field
186 ng_parse_generic_sockaddr_type_fields[] = {
187 { "len", &ng_parse_uint8_type },
188 { "family", &ng_parse_uint8_type },
189 { "data", &ng_ksocket_generic_sockdata_type },
190 { NULL }
191};
192static const struct ng_parse_type ng_ksocket_generic_sockaddr_type = {
193 &ng_parse_struct_type,
194 &ng_parse_generic_sockaddr_type_fields
195};
196
197/* Convert a struct sockaddr from ASCII to binary. If its a protocol
198 family that we specially handle, do that, otherwise defer to the
199 generic parse type ng_ksocket_generic_sockaddr_type. */
200static int
201ng_ksocket_sockaddr_parse(const struct ng_parse_type *type,
202 const char *s, int *off, const u_char *const start,
203 u_char *const buf, int *buflen)
204{
205 struct sockaddr *const sa = (struct sockaddr *)buf;
206 enum ng_parse_token tok;
207 char fambuf[32];
208 int family, len;
209 char *t;
210
211 /* If next token is a left curly brace, use generic parse type */
212 if ((tok = ng_parse_get_token(s, off, &len)) == T_LBRACE) {
213 return (*ng_ksocket_generic_sockaddr_type.supertype->parse)
214 (&ng_ksocket_generic_sockaddr_type,
215 s, off, start, buf, buflen);
216 }
217
218 /* Get socket address family followed by a slash */
219 while (isspace(s[*off]))
220 (*off)++;
221 if ((t = index(s + *off, '/')) == NULL)
222 return (EINVAL);
223 if ((len = t - (s + *off)) > sizeof(fambuf) - 1)
224 return (EINVAL);
225 strncpy(fambuf, s + *off, len);
226 fambuf[len] = '\0';
227 *off += len + 1;
228 if ((family = ng_ksocket_parse(ng_ksocket_families, fambuf, 0)) == -1)
229 return (EINVAL);
230
231 /* Set family */
232 if (*buflen < SADATA_OFFSET)
233 return (ERANGE);
234 sa->sa_family = family;
235
236 /* Set family-specific data and length */
237 switch (sa->sa_family) {
238 case PF_LOCAL: /* Get pathname */
239 {
240 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
241 struct sockaddr_un *const sun = (struct sockaddr_un *)sa;
242 int toklen, pathlen;
243 char *path;
244
245 if ((path = ng_get_string_token(s, off, &toklen, NULL)) == NULL)
246 return (EINVAL);
247 pathlen = strlen(path);
248 if (pathlen > SOCK_MAXADDRLEN) {
fc025606 249 kfree(path, M_NETGRAPH_KSOCKET);
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250 return (E2BIG);
251 }
252 if (*buflen < pathoff + pathlen) {
fc025606 253 kfree(path, M_NETGRAPH_KSOCKET);
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254 return (ERANGE);
255 }
256 *off += toklen;
257 bcopy(path, sun->sun_path, pathlen);
258 sun->sun_len = pathoff + pathlen;
fc025606 259 kfree(path, M_NETGRAPH_KSOCKET);
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260 break;
261 }
262
263 case PF_INET: /* Get an IP address with optional port */
264 {
265 struct sockaddr_in *const sin = (struct sockaddr_in *)sa;
266 int i;
267
268 /* Parse this: <ipaddress>[:port] */
269 for (i = 0; i < 4; i++) {
270 u_long val;
271 char *eptr;
272
273 val = strtoul(s + *off, &eptr, 10);
274 if (val > 0xff || eptr == s + *off)
275 return (EINVAL);
276 *off += (eptr - (s + *off));
277 ((u_char *)&sin->sin_addr)[i] = (u_char)val;
278 if (i < 3) {
279 if (s[*off] != '.')
280 return (EINVAL);
281 (*off)++;
282 } else if (s[*off] == ':') {
283 (*off)++;
284 val = strtoul(s + *off, &eptr, 10);
285 if (val > 0xffff || eptr == s + *off)
286 return (EINVAL);
287 *off += (eptr - (s + *off));
288 sin->sin_port = htons(val);
289 } else
290 sin->sin_port = 0;
291 }
292 bzero(&sin->sin_zero, sizeof(sin->sin_zero));
293 sin->sin_len = sizeof(*sin);
294 break;
295 }
296
297#if 0
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298 case PF_INET6:
299 case PF_IPX:
300#endif
301
302 default:
303 return (EINVAL);
304 }
305
306 /* Done */
307 *buflen = sa->sa_len;
308 return (0);
309}
310
311/* Convert a struct sockaddr from binary to ASCII */
312static int
313ng_ksocket_sockaddr_unparse(const struct ng_parse_type *type,
314 const u_char *data, int *off, char *cbuf, int cbuflen)
315{
316 const struct sockaddr *sa = (const struct sockaddr *)(data + *off);
317 int slen = 0;
318
319 /* Output socket address, either in special or generic format */
320 switch (sa->sa_family) {
321 case PF_LOCAL:
322 {
323 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
324 const struct sockaddr_un *sun = (const struct sockaddr_un *)sa;
325 const int pathlen = sun->sun_len - pathoff;
326 char pathbuf[SOCK_MAXADDRLEN + 1];
327 char *pathtoken;
328
329 bcopy(sun->sun_path, pathbuf, pathlen);
330 if ((pathtoken = ng_encode_string(pathbuf, pathlen)) == NULL)
331 return (ENOMEM);
332 slen += snprintf(cbuf, cbuflen, "local/%s", pathtoken);
fc025606 333 kfree(pathtoken, M_NETGRAPH);
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334 if (slen >= cbuflen)
335 return (ERANGE);
336 *off += sun->sun_len;
337 return (0);
338 }
339
340 case PF_INET:
341 {
342 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
343
344 slen += snprintf(cbuf, cbuflen, "inet/%d.%d.%d.%d",
345 ((const u_char *)&sin->sin_addr)[0],
346 ((const u_char *)&sin->sin_addr)[1],
347 ((const u_char *)&sin->sin_addr)[2],
348 ((const u_char *)&sin->sin_addr)[3]);
349 if (sin->sin_port != 0) {
350 slen += snprintf(cbuf + strlen(cbuf),
351 cbuflen - strlen(cbuf), ":%d",
352 (u_int)ntohs(sin->sin_port));
353 }
354 if (slen >= cbuflen)
355 return (ERANGE);
356 *off += sizeof(*sin);
357 return(0);
358 }
359
360#if 0
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361 case PF_INET6:
362 case PF_IPX:
363#endif
364
365 default:
366 return (*ng_ksocket_generic_sockaddr_type.supertype->unparse)
367 (&ng_ksocket_generic_sockaddr_type,
368 data, off, cbuf, cbuflen);
369 }
370}
371
372/* Parse type for struct sockaddr */
373static const struct ng_parse_type ng_ksocket_sockaddr_type = {
374 NULL,
375 NULL,
376 NULL,
377 &ng_ksocket_sockaddr_parse,
378 &ng_ksocket_sockaddr_unparse,
379 NULL /* no such thing as a default struct sockaddr */
380};
381
382/************************************************************************
383 STRUCT NG_KSOCKET_SOCKOPT PARSE TYPE
384 ************************************************************************/
385
386/* Get length of the struct ng_ksocket_sockopt value field, which is the
387 just the excess of the message argument portion over the length of
388 the struct ng_ksocket_sockopt. */
389static int
390ng_parse_sockoptval_getLength(const struct ng_parse_type *type,
391 const u_char *start, const u_char *buf)
392{
393 static const int offset = OFFSETOF(struct ng_ksocket_sockopt, value);
394 const struct ng_ksocket_sockopt *sopt;
395 const struct ng_mesg *msg;
396
397 sopt = (const struct ng_ksocket_sockopt *)(buf - offset);
398 msg = (const struct ng_mesg *)((const u_char *)sopt - sizeof(*msg));
399 return msg->header.arglen - sizeof(*sopt);
400}
401
402/* Parse type for the option value part of a struct ng_ksocket_sockopt
403 XXX Eventually, we should handle the different socket options specially.
404 XXX This would avoid byte order problems, eg an integer value of 1 is
405 XXX going to be "[1]" for little endian or "[3=1]" for big endian. */
406static const struct ng_parse_type ng_ksocket_sockoptval_type = {
407 &ng_parse_bytearray_type,
408 &ng_parse_sockoptval_getLength
409};
410
411/* Parse type for struct ng_ksocket_sockopt */
412static const struct ng_parse_struct_field ng_ksocket_sockopt_type_fields[]
413 = NG_KSOCKET_SOCKOPT_INFO(&ng_ksocket_sockoptval_type);
414static const struct ng_parse_type ng_ksocket_sockopt_type = {
415 &ng_parse_struct_type,
416 &ng_ksocket_sockopt_type_fields
417};
418
419/* Parse type for struct ng_ksocket_accept */
420static const struct ng_parse_struct_field ng_ksocket_accept_type_fields[]
421 = NGM_KSOCKET_ACCEPT_INFO;
422static const struct ng_parse_type ng_ksocket_accept_type = {
423 &ng_parse_struct_type,
424 &ng_ksocket_accept_type_fields
425};
426
427/* List of commands and how to convert arguments to/from ASCII */
428static const struct ng_cmdlist ng_ksocket_cmds[] = {
429 {
430 NGM_KSOCKET_COOKIE,
431 NGM_KSOCKET_BIND,
432 "bind",
433 &ng_ksocket_sockaddr_type,
434 NULL
435 },
436 {
437 NGM_KSOCKET_COOKIE,
438 NGM_KSOCKET_LISTEN,
439 "listen",
440 &ng_parse_int32_type,
441 NULL
442 },
443 {
444 NGM_KSOCKET_COOKIE,
445 NGM_KSOCKET_ACCEPT,
446 "accept",
447 NULL,
448 &ng_ksocket_accept_type
449 },
450 {
451 NGM_KSOCKET_COOKIE,
452 NGM_KSOCKET_CONNECT,
453 "connect",
454 &ng_ksocket_sockaddr_type,
455 &ng_parse_int32_type
456 },
457 {
458 NGM_KSOCKET_COOKIE,
459 NGM_KSOCKET_GETNAME,
460 "getname",
461 NULL,
462 &ng_ksocket_sockaddr_type
463 },
464 {
465 NGM_KSOCKET_COOKIE,
466 NGM_KSOCKET_GETPEERNAME,
467 "getpeername",
468 NULL,
469 &ng_ksocket_sockaddr_type
470 },
471 {
472 NGM_KSOCKET_COOKIE,
473 NGM_KSOCKET_SETOPT,
474 "setopt",
475 &ng_ksocket_sockopt_type,
476 NULL
477 },
478 {
479 NGM_KSOCKET_COOKIE,
480 NGM_KSOCKET_GETOPT,
481 "getopt",
482 &ng_ksocket_sockopt_type,
483 &ng_ksocket_sockopt_type
484 },
485 { 0 }
486};
487
488/* Node type descriptor */
489static struct ng_type ng_ksocket_typestruct = {
490 .version = NG_ABI_VERSION,
491 .name = NG_KSOCKET_NODE_TYPE,
492 .constructor = ng_ksocket_constructor,
493 .rcvmsg = ng_ksocket_rcvmsg,
494 .shutdown = ng_ksocket_shutdown,
495 .newhook = ng_ksocket_newhook,
496 .connect = ng_ksocket_connect,
497 .rcvdata = ng_ksocket_rcvdata,
498 .disconnect = ng_ksocket_disconnect,
499 .cmdlist = ng_ksocket_cmds,
500};
501NETGRAPH_INIT(ksocket, &ng_ksocket_typestruct);
502
503#define ERROUT(x) do { error = (x); goto done; } while (0)
504
505/************************************************************************
506 NETGRAPH NODE STUFF
507 ************************************************************************/
508
509/*
510 * Node type constructor
511 * The NODE part is assumed to be all set up.
512 * There is already a reference to the node for us.
513 */
514static int
515ng_ksocket_constructor(node_p node)
516{
517 priv_p priv;
518
519 /* Allocate private structure */
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520 priv = kmalloc(sizeof(*priv), M_NETGRAPH,
521 M_WAITOK | M_NULLOK | M_ZERO);
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522 if (priv == NULL)
523 return (ENOMEM);
524
525 LIST_INIT(&priv->embryos);
526 /* cross link them */
527 priv->node = node;
528 NG_NODE_SET_PRIVATE(node, priv);
529
530 /* Done */
531 return (0);
532}
533
534/*
535 * Give our OK for a hook to be added. The hook name is of the
536 * form "<family>/<type>/<proto>" where the three components may
537 * be decimal numbers or else aliases from the above lists.
538 *
539 * Connecting a hook amounts to opening the socket. Disconnecting
540 * the hook closes the socket and destroys the node as well.
541 */
542static int
543ng_ksocket_newhook(node_p node, hook_p hook, const char *name0)
544{
545 struct thread *td = curthread; /* XXX broken */
546 const priv_p priv = NG_NODE_PRIVATE(node);
547 char *s1, *s2, name[NG_HOOKSIZ];
548 int family, type, protocol, error;
549
550 /* Check if we're already connected */
551 if (priv->hook != NULL)
552 return (EISCONN);
553
554 if (priv->flags & KSF_CLONED) {
555 if (priv->flags & KSF_EMBRYONIC) {
556 /* Remove ourselves from our parent's embryo list */
557 LIST_REMOVE(priv, siblings);
558 priv->flags &= ~KSF_EMBRYONIC;
559 }
560 } else {
561 /* Extract family, type, and protocol from hook name */
562 snprintf(name, sizeof(name), "%s", name0);
563 s1 = name;
564 if ((s2 = index(s1, '/')) == NULL)
565 return (EINVAL);
566 *s2++ = '\0';
567 family = ng_ksocket_parse(ng_ksocket_families, s1, 0);
568 if (family == -1)
569 return (EINVAL);
570 s1 = s2;
571 if ((s2 = index(s1, '/')) == NULL)
572 return (EINVAL);
573 *s2++ = '\0';
574 type = ng_ksocket_parse(ng_ksocket_types, s1, 0);
575 if (type == -1)
576 return (EINVAL);
577 s1 = s2;
578 protocol = ng_ksocket_parse(ng_ksocket_protos, s1, family);
579 if (protocol == -1)
580 return (EINVAL);
581
582 /* Create the socket */
583 error = socreate(family, &priv->so, type, protocol,
584 td->td_ucred, td);
585 if (error != 0)
586 return (error);
587
588 /* XXX call soreserve() ? */
589
590 }
591
592 /* OK */
593 priv->hook = hook;
594
595 /*
596 * In case of misconfigured routing a packet may reenter
597 * ksocket node recursively. Decouple stack to avoid possible
598 * panics about sleeping with locks held.
599 */
600 NG_HOOK_FORCE_QUEUE(hook);
601
602 return(0);
603}
604
605static int
606ng_ksocket_connect(hook_p hook)
607{
608 node_p node = NG_HOOK_NODE(hook);
609 const priv_p priv = NG_NODE_PRIVATE(node);
610 struct socket *const so = priv->so;
611
612 /* Add our hook for incoming data and other events */
613 priv->so->so_upcallarg = (caddr_t)node;
614 priv->so->so_upcall = ng_ksocket_incoming;
615 SOCKBUF_LOCK(&priv->so->so_rcv);
616 priv->so->so_rcv.sb_flags |= SB_UPCALL;
617 SOCKBUF_UNLOCK(&priv->so->so_rcv);
618 SOCKBUF_LOCK(&priv->so->so_snd);
619 priv->so->so_snd.sb_flags |= SB_UPCALL;
620 SOCKBUF_UNLOCK(&priv->so->so_snd);
621 SOCK_LOCK(priv->so);
6cef7136 622 sosetstate(priv->so, SS_NBIO);
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623 SOCK_UNLOCK(priv->so);
624 /*
625 * --Original comment--
626 * On a cloned socket we may have already received one or more
627 * upcalls which we couldn't handle without a hook. Handle
628 * those now.
629 * We cannot call the upcall function directly
630 * from here, because until this function has returned our
631 * hook isn't connected.
632 *
633 * ---meta comment for -current ---
634 * XXX This is dubius.
635 * Upcalls between the time that the hook was
636 * first created and now (on another processesor) will
637 * be earlier on the queue than the request to finalise the hook.
638 * By the time the hook is finalised,
639 * The queued upcalls will have happenned and the code
640 * will have discarded them because of a lack of a hook.
641 * (socket not open).
642 *
643 * This is a bad byproduct of the complicated way in which hooks
644 * are now created (3 daisy chained async events).
645 *
646 * Since we are a netgraph operation
647 * We know that we hold a lock on this node. This forces the
648 * request we make below to be queued rather than implemented
649 * immediatly which will cause the upcall function to be called a bit
650 * later.
651 * However, as we will run any waiting queued operations immediatly
652 * after doing this one, if we have not finalised the other end
653 * of the hook, those queued operations will fail.
654 */
655 if (priv->flags & KSF_CLONED) {
5a975a3d 656 ng_send_fn(node, NULL, &ng_ksocket_incoming2, so, M_WAITOK | M_NULLOK);
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657 }
658
659 return (0);
660}
661
662/*
663 * Receive a control message
664 */
665static int
666ng_ksocket_rcvmsg(node_p node, item_p item, hook_p lasthook)
667{
668 struct thread *td = curthread; /* XXX broken */
669 const priv_p priv = NG_NODE_PRIVATE(node);
670 struct socket *const so = priv->so;
671 struct ng_mesg *resp = NULL;
672 int error = 0;
673 struct ng_mesg *msg;
674 ng_ID_t raddr;
675
676 NGI_GET_MSG(item, msg);
677 switch (msg->header.typecookie) {
678 case NGM_KSOCKET_COOKIE:
679 switch (msg->header.cmd) {
680 case NGM_KSOCKET_BIND:
681 {
682 struct sockaddr *const sa
683 = (struct sockaddr *)msg->data;
684
685 /* Sanity check */
686 if (msg->header.arglen < SADATA_OFFSET
687 || msg->header.arglen < sa->sa_len)
688 ERROUT(EINVAL);
689 if (so == NULL)
690 ERROUT(ENXIO);
691
692 /* Bind */
693 error = sobind(so, sa, td);
694 break;
695 }
696 case NGM_KSOCKET_LISTEN:
697 {
698 /* Sanity check */
699 if (msg->header.arglen != sizeof(int32_t))
700 ERROUT(EINVAL);
701 if (so == NULL)
702 ERROUT(ENXIO);
703
704 /* Listen */
705 error = solisten(so, *((int32_t *)msg->data), td);
706 break;
707 }
708
709 case NGM_KSOCKET_ACCEPT:
710 {
711 /* Sanity check */
712 if (msg->header.arglen != 0)
713 ERROUT(EINVAL);
714 if (so == NULL)
715 ERROUT(ENXIO);
716
717 /* Make sure the socket is capable of accepting */
718 if (!(so->so_options & SO_ACCEPTCONN))
719 ERROUT(EINVAL);
720 if (priv->flags & KSF_ACCEPTING)
721 ERROUT(EALREADY);
722
723 error = ng_ksocket_check_accept(priv);
724 if (error != 0 && error != EWOULDBLOCK)
725 ERROUT(error);
726
727 /*
728 * If a connection is already complete, take it.
729 * Otherwise let the upcall function deal with
730 * the connection when it comes in.
731 */
732 priv->response_token = msg->header.token;
733 raddr = priv->response_addr = NGI_RETADDR(item);
734 if (error == 0) {
735 ng_ksocket_finish_accept(priv);
736 } else
737 priv->flags |= KSF_ACCEPTING;
738 break;
739 }
740
741 case NGM_KSOCKET_CONNECT:
742 {
743 struct sockaddr *const sa
744 = (struct sockaddr *)msg->data;
745
746 /* Sanity check */
747 if (msg->header.arglen < SADATA_OFFSET
748 || msg->header.arglen < sa->sa_len)
749 ERROUT(EINVAL);
750 if (so == NULL)
751 ERROUT(ENXIO);
752
753 /* Do connect */
754 if ((so->so_state & SS_ISCONNECTING) != 0)
755 ERROUT(EALREADY);
756 if ((error = soconnect(so, sa, td)) != 0) {
6cef7136 757 soclrstate(so, SS_ISCONNECTING);
b06ebda0
MD
758 ERROUT(error);
759 }
760 if ((so->so_state & SS_ISCONNECTING) != 0) {
761 /* We will notify the sender when we connect */
762 priv->response_token = msg->header.token;
763 raddr = priv->response_addr = NGI_RETADDR(item);
764 priv->flags |= KSF_CONNECTING;
765 ERROUT(EINPROGRESS);
766 }
767 break;
768 }
769
770 case NGM_KSOCKET_GETNAME:
771 case NGM_KSOCKET_GETPEERNAME:
772 {
773 int (*func)(struct socket *so, struct sockaddr **nam);
774 struct sockaddr *sa = NULL;
775 int len;
776
777 /* Sanity check */
778 if (msg->header.arglen != 0)
779 ERROUT(EINVAL);
780 if (so == NULL)
781 ERROUT(ENXIO);
782
783 /* Get function */
784 if (msg->header.cmd == NGM_KSOCKET_GETPEERNAME) {
785 if ((so->so_state
786 & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0)
787 ERROUT(ENOTCONN);
788 func = so->so_proto->pr_usrreqs->pru_peeraddr;
789 } else
790 func = so->so_proto->pr_usrreqs->pru_sockaddr;
791
792 /* Get local or peer address */
793 if ((error = (*func)(so, &sa)) != 0)
794 goto bail;
795 len = (sa == NULL) ? 0 : sa->sa_len;
796
797 /* Send it back in a response */
5a975a3d 798 NG_MKRESPONSE(resp, msg, len, M_WAITOK | M_NULLOK);
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MD
799 if (resp == NULL) {
800 error = ENOMEM;
801 goto bail;
802 }
803 bcopy(sa, resp->data, len);
804
805 bail:
806 /* Cleanup */
807 if (sa != NULL)
fc025606 808 kfree(sa, M_SONAME);
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MD
809 break;
810 }
811
812 case NGM_KSOCKET_GETOPT:
813 {
814 struct ng_ksocket_sockopt *ksopt =
815 (struct ng_ksocket_sockopt *)msg->data;
816 struct sockopt sopt;
817
818 /* Sanity check */
819 if (msg->header.arglen != sizeof(*ksopt))
820 ERROUT(EINVAL);
821 if (so == NULL)
822 ERROUT(ENXIO);
823
824 /* Get response with room for option value */
825 NG_MKRESPONSE(resp, msg, sizeof(*ksopt)
5a975a3d 826 + NG_KSOCKET_MAX_OPTLEN, M_WAITOK | M_NULLOK);
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MD
827 if (resp == NULL)
828 ERROUT(ENOMEM);
829
830 /* Get socket option, and put value in the response */
831 sopt.sopt_dir = SOPT_GET;
832 sopt.sopt_level = ksopt->level;
833 sopt.sopt_name = ksopt->name;
834 sopt.sopt_td = NULL;
835 sopt.sopt_valsize = NG_KSOCKET_MAX_OPTLEN;
836 ksopt = (struct ng_ksocket_sockopt *)resp->data;
837 sopt.sopt_val = ksopt->value;
838 if ((error = sogetopt(so, &sopt)) != 0) {
839 NG_FREE_MSG(resp);
840 break;
841 }
842
843 /* Set actual value length */
844 resp->header.arglen = sizeof(*ksopt)
845 + sopt.sopt_valsize;
846 break;
847 }
848
849 case NGM_KSOCKET_SETOPT:
850 {
851 struct ng_ksocket_sockopt *const ksopt =
852 (struct ng_ksocket_sockopt *)msg->data;
853 const int valsize = msg->header.arglen - sizeof(*ksopt);
854 struct sockopt sopt;
855
856 /* Sanity check */
857 if (valsize < 0)
858 ERROUT(EINVAL);
859 if (so == NULL)
860 ERROUT(ENXIO);
861
862 /* Set socket option */
863 sopt.sopt_dir = SOPT_SET;
864 sopt.sopt_level = ksopt->level;
865 sopt.sopt_name = ksopt->name;
866 sopt.sopt_val = ksopt->value;
867 sopt.sopt_valsize = valsize;
868 sopt.sopt_td = NULL;
869 error = sosetopt(so, &sopt);
870 break;
871 }
872
873 default:
874 error = EINVAL;
875 break;
876 }
877 break;
878 default:
879 error = EINVAL;
880 break;
881 }
882done:
883 NG_RESPOND_MSG(error, node, item, resp);
884 NG_FREE_MSG(msg);
885 return (error);
886}
887
888/*
889 * Receive incoming data on our hook. Send it out the socket.
890 */
891static int
892ng_ksocket_rcvdata(hook_p hook, item_p item)
893{
894 struct thread *td = curthread; /* XXX broken */
895 const node_p node = NG_HOOK_NODE(hook);
896 const priv_p priv = NG_NODE_PRIVATE(node);
897 struct socket *const so = priv->so;
898 struct sockaddr *sa = NULL;
899 int error;
900 struct mbuf *m;
901 struct sa_tag *stag;
902
903 /* Extract data */
904 NGI_GET_M(item, m);
905 NG_FREE_ITEM(item);
906
907 /*
908 * Look if socket address is stored in packet tags.
909 * If sockaddr is ours, or provided by a third party (zero id),
910 * then we accept it.
911 */
912 if (((stag = (struct sa_tag *)m_tag_locate(m, NGM_KSOCKET_COOKIE,
913 NG_KSOCKET_TAG_SOCKADDR, NULL)) != NULL) &&
914 (stag->id == NG_NODE_ID(node) || stag->id == 0))
915 sa = &stag->sa;
916
917 /* Reset specific mbuf flags to prevent addressing problems. */
918 m->m_flags &= ~(M_BCAST|M_MCAST);
919
920 /* Send packet */
921 error = sosend(so, sa, 0, m, 0, 0, td);
922
923 return (error);
924}
925
926/*
927 * Destroy node
928 */
929static int
930ng_ksocket_shutdown(node_p node)
931{
932 const priv_p priv = NG_NODE_PRIVATE(node);
933 priv_p embryo;
934
935 /* Close our socket (if any) */
936 if (priv->so != NULL) {
937 SOCKBUF_LOCK(&priv->so->so_rcv);
938 priv->so->so_rcv.sb_flags &= ~SB_UPCALL;
939 SOCKBUF_UNLOCK(&priv->so->so_rcv);
940 SOCKBUF_LOCK(&priv->so->so_snd);
941 priv->so->so_snd.sb_flags &= ~SB_UPCALL;
942 SOCKBUF_UNLOCK(&priv->so->so_snd);
943 priv->so->so_upcall = NULL;
944 soclose(priv->so);
945 priv->so = NULL;
946 }
947
948 /* If we are an embryo, take ourselves out of the parent's list */
949 if (priv->flags & KSF_EMBRYONIC) {
950 LIST_REMOVE(priv, siblings);
951 priv->flags &= ~KSF_EMBRYONIC;
952 }
953
954 /* Remove any embryonic children we have */
955 while (!LIST_EMPTY(&priv->embryos)) {
956 embryo = LIST_FIRST(&priv->embryos);
957 ng_rmnode_self(embryo->node);
958 }
959
960 /* Take down netgraph node */
961 bzero(priv, sizeof(*priv));
fc025606 962 kfree(priv, M_NETGRAPH);
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MD
963 NG_NODE_SET_PRIVATE(node, NULL);
964 NG_NODE_UNREF(node); /* let the node escape */
965 return (0);
966}
967
968/*
969 * Hook disconnection
970 */
971static int
972ng_ksocket_disconnect(hook_p hook)
973{
974 KASSERT(NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0,
975 ("%s: numhooks=%d?", __func__,
976 NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook))));
977 if (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))
978 ng_rmnode_self(NG_HOOK_NODE(hook));
979 return (0);
980}
981
982/************************************************************************
983 HELPER STUFF
984 ************************************************************************/
985/*
986 * You should not "just call" a netgraph node function from an external
987 * asynchronous event. This is because in doing so you are ignoring the
988 * locking on the netgraph nodes. Instead call your function via ng_send_fn().
989 * This will call the function you chose, but will first do all the
990 * locking rigmarole. Your function MAY only be called at some distant future
991 * time (several millisecs away) so don't give it any arguments
992 * that may be revoked soon (e.g. on your stack).
993 *
994 * To decouple stack, we use queue version of ng_send_fn().
995 */
996
997static void
998ng_ksocket_incoming(struct socket *so, void *arg, int waitflag)
999{
1000 const node_p node = arg;
1001 const priv_p priv = NG_NODE_PRIVATE(node);
1002 int wait = ((waitflag & M_WAITOK) ? NG_WAITOK : 0) | NG_QUEUE;
1003
1004 /*
1005 * Even if node is not locked, as soon as we are called, we assume
1006 * it exist and it's private area is valid. With some care we can
1007 * access it. Mark node that incoming event for it was sent to
1008 * avoid unneded queue trashing.
1009 */
1010 if (atomic_cmpset_int(&priv->fn_sent, 0, 1) &&
1011 ng_send_fn1(node, NULL, &ng_ksocket_incoming2, so, 0, wait)) {
1012 atomic_store_rel_int(&priv->fn_sent, 0);
1013 }
1014}
1015
1016
1017/*
1018 * When incoming data is appended to the socket, we get notified here.
1019 * This is also called whenever a significant event occurs for the socket.
1020 * Our original caller may have queued this even some time ago and
1021 * we cannot trust that he even still exists. The node however is being
1022 * held with a reference by the queueing code and guarantied to be valid.
1023 */
1024static void
1025ng_ksocket_incoming2(node_p node, hook_p hook, void *arg1, int arg2)
1026{
1027 struct socket *so = arg1;
1028 const priv_p priv = NG_NODE_PRIVATE(node);
1029 struct mbuf *m;
1030 struct ng_mesg *response;
1031 struct uio auio;
1032 int s, flags, error;
1033
1034 s = splnet();
1035
1036 /* so = priv->so; *//* XXX could have derived this like so */
1037 KASSERT(so == priv->so, ("%s: wrong socket", __func__));
1038
1039 /* Allow next incoming event to be queued. */
1040 atomic_store_rel_int(&priv->fn_sent, 0);
1041
1042 /* Check whether a pending connect operation has completed */
1043 if (priv->flags & KSF_CONNECTING) {
1044 if ((error = so->so_error) != 0) {
1045 so->so_error = 0;
6cef7136 1046 soclrstate(so, SS_ISCONNECTING);
b06ebda0
MD
1047 }
1048 if (!(so->so_state & SS_ISCONNECTING)) {
1049 NG_MKMESSAGE(response, NGM_KSOCKET_COOKIE,
5a975a3d 1050 NGM_KSOCKET_CONNECT, sizeof(int32_t), M_WAITOK | M_NULLOK);
b06ebda0
MD
1051 if (response != NULL) {
1052 response->header.flags |= NGF_RESP;
1053 response->header.token = priv->response_token;
1054 *(int32_t *)response->data = error;
1055 /*
1056 * send an async "response" message
1057 * to the node that set us up
1058 * (if it still exists)
1059 */
1060 NG_SEND_MSG_ID(error, node,
1061 response, priv->response_addr, 0);
1062 }
1063 priv->flags &= ~KSF_CONNECTING;
1064 }
1065 }
1066
1067 /* Check whether a pending accept operation has completed */
1068 if (priv->flags & KSF_ACCEPTING) {
1069 error = ng_ksocket_check_accept(priv);
1070 if (error != EWOULDBLOCK)
1071 priv->flags &= ~KSF_ACCEPTING;
1072 if (error == 0)
1073 ng_ksocket_finish_accept(priv);
1074 }
1075
1076 /*
1077 * If we don't have a hook, we must handle data events later. When
1078 * the hook gets created and is connected, this upcall function
1079 * will be called again.
1080 */
1081 if (priv->hook == NULL) {
1082 splx(s);
1083 return;
1084 }
1085
1086 /* Read and forward available mbuf's */
1087 auio.uio_td = NULL;
1088 auio.uio_resid = 1000000000;
1089 flags = MSG_DONTWAIT;
1090 while (1) {
1091 struct sockaddr *sa = NULL;
1092 struct mbuf *n;
1093
1094 /* Try to get next packet from socket */
1095 if ((error = soreceive(so, (so->so_state & SS_ISCONNECTED) ?
60233e58 1096 NULL : &sa, &auio, &m, NULL, &flags)) != 0)
b06ebda0
MD
1097 break;
1098
1099 /* See if we got anything */
1100 if (m == NULL) {
1101 if (sa != NULL)
fc025606 1102 kfree(sa, M_SONAME);
b06ebda0
MD
1103 break;
1104 }
1105
1106 /*
1107 * Don't trust the various socket layers to get the
1108 * packet header and length correct (e.g. kern/15175).
1109 *
1110 * Also, do not trust that soreceive() will clear m_nextpkt
1111 * for us (e.g. kern/84952, kern/82413).
1112 */
1113 m->m_pkthdr.csum_flags = 0;
1114 for (n = m, m->m_pkthdr.len = 0; n != NULL; n = n->m_next) {
1115 m->m_pkthdr.len += n->m_len;
1116 n->m_nextpkt = NULL;
1117 }
1118
1119 /* Put peer's socket address (if any) into a tag */
1120 if (sa != NULL) {
1121 struct sa_tag *stag;
1122
1123 stag = (struct sa_tag *)m_tag_alloc(NGM_KSOCKET_COOKIE,
1124 NG_KSOCKET_TAG_SOCKADDR, sizeof(ng_ID_t) +
5a975a3d 1125 sa->sa_len, MB_DONTWAIT);
b06ebda0 1126 if (stag == NULL) {
fc025606 1127 kfree(sa, M_SONAME);
b06ebda0
MD
1128 goto sendit;
1129 }
1130 bcopy(sa, &stag->sa, sa->sa_len);
fc025606 1131 kfree(sa, M_SONAME);
b06ebda0
MD
1132 stag->id = NG_NODE_ID(node);
1133 m_tag_prepend(m, &stag->tag);
1134 }
1135
1136sendit: /* Forward data with optional peer sockaddr as packet tag */
1137 NG_SEND_DATA_ONLY(error, priv->hook, m);
1138 }
1139
1140 /*
1141 * If the peer has closed the connection, forward a 0-length mbuf
1142 * to indicate end-of-file.
1143 */
1144 if (so->so_rcv.sb_state & SBS_CANTRCVMORE && !(priv->flags & KSF_EOFSEEN)) {
5a975a3d 1145 MGETHDR(m, MB_DONTWAIT, MT_DATA);
b06ebda0
MD
1146 if (m != NULL) {
1147 m->m_len = m->m_pkthdr.len = 0;
1148 NG_SEND_DATA_ONLY(error, priv->hook, m);
1149 }
1150 priv->flags |= KSF_EOFSEEN;
1151 }
1152 splx(s);
1153}
1154
1155/*
1156 * Check for a completed incoming connection and return 0 if one is found.
1157 * Otherwise return the appropriate error code.
1158 */
1159static int
1160ng_ksocket_check_accept(priv_p priv)
1161{
1162 struct socket *const head = priv->so;
1163 int error;
1164
1165 if ((error = head->so_error) != 0) {
1166 head->so_error = 0;
1167 return error;
1168 }
1169 /* Unlocked read. */
1170 if (TAILQ_EMPTY(&head->so_comp)) {
1171 if (head->so_rcv.sb_state & SBS_CANTRCVMORE)
1172 return ECONNABORTED;
1173 return EWOULDBLOCK;
1174 }
1175 return 0;
1176}
1177
1178/*
1179 * Handle the first completed incoming connection, assumed to be already
1180 * on the socket's so_comp queue.
1181 */
1182static void
1183ng_ksocket_finish_accept(priv_p priv)
1184{
1185 struct socket *const head = priv->so;
1186 struct socket *so;
1187 struct sockaddr *sa = NULL;
1188 struct ng_mesg *resp;
1189 struct ng_ksocket_accept *resp_data;
1190 node_p node;
1191 priv_p priv2;
1192 int len;
1193 int error;
1194
1195 ACCEPT_LOCK();
1196 so = TAILQ_FIRST(&head->so_comp);
1197 if (so == NULL) { /* Should never happen */
1198 ACCEPT_UNLOCK();
1199 return;
1200 }
1201 TAILQ_REMOVE(&head->so_comp, so, so_list);
1202 head->so_qlen--;
1203 so->so_qstate &= ~SQ_COMP;
1204 so->so_head = NULL;
1205 SOCK_LOCK(so);
1206 soref(so);
6cef7136 1207 sosetstate(so, SS_NBIO);
b06ebda0
MD
1208 SOCK_UNLOCK(so);
1209 ACCEPT_UNLOCK();
1210
1211 /* XXX KNOTE(&head->so_rcv.sb_sel.si_note, 0); */
1212
1213 soaccept(so, &sa);
1214
1215 len = OFFSETOF(struct ng_ksocket_accept, addr);
1216 if (sa != NULL)
1217 len += sa->sa_len;
1218
1219 NG_MKMESSAGE(resp, NGM_KSOCKET_COOKIE, NGM_KSOCKET_ACCEPT, len,
5a975a3d 1220 M_WAITOK | M_NULLOK);
b06ebda0
MD
1221 if (resp == NULL) {
1222 soclose(so);
1223 goto out;
1224 }
1225 resp->header.flags |= NGF_RESP;
1226 resp->header.token = priv->response_token;
1227
1228 /* Clone a ksocket node to wrap the new socket */
1229 error = ng_make_node_common(&ng_ksocket_typestruct, &node);
1230 if (error) {
fc025606 1231 kfree(resp, M_NETGRAPH);
b06ebda0
MD
1232 soclose(so);
1233 goto out;
1234 }
1235
1236 if (ng_ksocket_constructor(node) != 0) {
1237 NG_NODE_UNREF(node);
fc025606 1238 kfree(resp, M_NETGRAPH);
b06ebda0
MD
1239 soclose(so);
1240 goto out;
1241 }
1242
1243 priv2 = NG_NODE_PRIVATE(node);
1244 priv2->so = so;
1245 priv2->flags |= KSF_CLONED | KSF_EMBRYONIC;
1246
1247 /*
1248 * Insert the cloned node into a list of embryonic children
1249 * on the parent node. When a hook is created on the cloned
1250 * node it will be removed from this list. When the parent
1251 * is destroyed it will destroy any embryonic children it has.
1252 */
1253 LIST_INSERT_HEAD(&priv->embryos, priv2, siblings);
1254
1255 so->so_upcallarg = (caddr_t)node;
1256 so->so_upcall = ng_ksocket_incoming;
1257 SOCKBUF_LOCK(&so->so_rcv);
1258 so->so_rcv.sb_flags |= SB_UPCALL;
1259 SOCKBUF_UNLOCK(&so->so_rcv);
1260 SOCKBUF_LOCK(&so->so_snd);
1261 so->so_snd.sb_flags |= SB_UPCALL;
1262 SOCKBUF_UNLOCK(&so->so_snd);
1263
1264 /* Fill in the response data and send it or return it to the caller */
1265 resp_data = (struct ng_ksocket_accept *)resp->data;
1266 resp_data->nodeid = NG_NODE_ID(node);
1267 if (sa != NULL)
1268 bcopy(sa, &resp_data->addr, sa->sa_len);
1269 NG_SEND_MSG_ID(error, node, resp, priv->response_addr, 0);
1270
1271out:
1272 if (sa != NULL)
fc025606 1273 kfree(sa, M_SONAME);
b06ebda0
MD
1274}
1275
1276/*
1277 * Parse out either an integer value or an alias.
1278 */
1279static int
1280ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
1281 const char *s, int family)
1282{
1283 int k, val;
1284 char *eptr;
1285
1286 /* Try aliases */
1287 for (k = 0; aliases[k].name != NULL; k++) {
1288 if (strcmp(s, aliases[k].name) == 0
1289 && aliases[k].family == family)
1290 return aliases[k].value;
1291 }
1292
1293 /* Try parsing as a number */
1294 val = (int)strtoul(s, &eptr, 10);
1295 if (val < 0 || *eptr != '\0')
1296 return (-1);
1297 return (val);
1298}
1299