40 * $Whistle: ng_ksocket.c,v 1.1 1999/11/16 20:04:40 archie Exp $
41 */
42
43/*
44 * Kernel socket node type. This node type is basically a kernel-mode
45 * version of a socket... kindof like the reverse of the socket node type.
46 */
47
48#include <sys/param.h>
49#include <sys/systm.h>
50#include <sys/kernel.h>
51#include <sys/mbuf.h>
52#include <sys/proc.h>
53#include <sys/malloc.h>
54#include <sys/ctype.h>
55#include <sys/protosw.h>
56#include <sys/errno.h>
57#include <sys/socket.h>
58#include <sys/socketvar.h>
59#include <sys/uio.h>
60#include <sys/un.h>
61
62#include <netgraph/ng_message.h>
63#include <netgraph/netgraph.h>
64#include <netgraph/ng_parse.h>
65#include <netgraph/ng_ksocket.h>
66
67#include <netinet/in.h>
68#include <netatalk/at.h>
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 LIST_HEAD(, ng_ksocket_private) embryos;
85 LIST_ENTRY(ng_ksocket_private) siblings;
86 u_int32_t flags;
87 u_int32_t response_token;
88 ng_ID_t response_addr;
89};
90typedef struct ng_ksocket_private *priv_p;
91
92/* Flags for priv_p */
93#define KSF_CONNECTING 0x00000001 /* Waiting for connection complete */
94#define KSF_ACCEPTING 0x00000002 /* Waiting for accept complete */
95#define KSF_EOFSEEN 0x00000004 /* Have sent 0-length EOF mbuf */
96#define KSF_CLONED 0x00000008 /* Cloned from an accepting socket */
97#define KSF_EMBRYONIC 0x00000010 /* Cloned node with no hooks yet */
98
99/* Netgraph node methods */
100static ng_constructor_t ng_ksocket_constructor;
101static ng_rcvmsg_t ng_ksocket_rcvmsg;
102static ng_shutdown_t ng_ksocket_shutdown;
103static ng_newhook_t ng_ksocket_newhook;
104static ng_rcvdata_t ng_ksocket_rcvdata;
105static ng_connect_t ng_ksocket_connect;
106static ng_disconnect_t ng_ksocket_disconnect;
107
108/* Alias structure */
109struct ng_ksocket_alias {
110 const char *name;
111 const int value;
112 const int family;
113};
114
115/* Protocol family aliases */
116static const struct ng_ksocket_alias ng_ksocket_families[] = {
117 { "local", PF_LOCAL },
118 { "inet", PF_INET },
119 { "inet6", PF_INET6 },
120 { "atalk", PF_APPLETALK },
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 { "ddp", ATPROTO_DDP, PF_APPLETALK },
151 { "aarp", ATPROTO_AARP, PF_APPLETALK },
152 { NULL, -1 },
153};
154
155/* Helper functions */
156static int ng_ksocket_check_accept(priv_p);
157static void ng_ksocket_finish_accept(priv_p);
158static void ng_ksocket_incoming(struct socket *so, void *arg, int waitflag);
159static int ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
160 const char *s, int family);
161static void ng_ksocket_incoming2(node_p node, hook_p hook,
162 void *arg1, int waitflag);
163
164/************************************************************************
165 STRUCT SOCKADDR PARSE TYPE
166 ************************************************************************/
167
168/* Get the length of the data portion of a generic struct sockaddr */
169static int
170ng_parse_generic_sockdata_getLength(const struct ng_parse_type *type,
171 const u_char *start, const u_char *buf)
172{
173 const struct sockaddr *sa;
174
175 sa = (const struct sockaddr *)(buf - SADATA_OFFSET);
176 return (sa->sa_len < SADATA_OFFSET) ? 0 : sa->sa_len - SADATA_OFFSET;
177}
178
179/* Type for the variable length data portion of a generic struct sockaddr */
180static const struct ng_parse_type ng_ksocket_generic_sockdata_type = {
181 &ng_parse_bytearray_type,
182 &ng_parse_generic_sockdata_getLength
183};
184
185/* Type for a generic struct sockaddr */
186static const struct ng_parse_struct_info ng_parse_generic_sockaddr_type_info = {
187 {
188 { "len", &ng_parse_uint8_type },
189 { "family", &ng_parse_uint8_type },
190 { "data", &ng_ksocket_generic_sockdata_type },
191 { NULL }
192 }
193};
194static const struct ng_parse_type ng_ksocket_generic_sockaddr_type = {
195 &ng_parse_struct_type,
196 &ng_parse_generic_sockaddr_type_info
197};
198
199/* Convert a struct sockaddr from ASCII to binary. If its a protocol
200 family that we specially handle, do that, otherwise defer to the
201 generic parse type ng_ksocket_generic_sockaddr_type. */
202static int
203ng_ksocket_sockaddr_parse(const struct ng_parse_type *type,
204 const char *s, int *off, const u_char *const start,
205 u_char *const buf, int *buflen)
206{
207 struct sockaddr *const sa = (struct sockaddr *)buf;
208 enum ng_parse_token tok;
209 char fambuf[32];
210 int family, len;
211 char *t;
212
213 /* If next token is a left curly brace, use generic parse type */
214 if ((tok = ng_parse_get_token(s, off, &len)) == T_LBRACE) {
215 return (*ng_ksocket_generic_sockaddr_type.supertype->parse)
216 (&ng_ksocket_generic_sockaddr_type,
217 s, off, start, buf, buflen);
218 }
219
220 /* Get socket address family followed by a slash */
221 while (isspace(s[*off]))
222 (*off)++;
223 if ((t = index(s + *off, '/')) == NULL)
224 return (EINVAL);
225 if ((len = t - (s + *off)) > sizeof(fambuf) - 1)
226 return (EINVAL);
227 strncpy(fambuf, s + *off, len);
228 fambuf[len] = '\0';
229 *off += len + 1;
230 if ((family = ng_ksocket_parse(ng_ksocket_families, fambuf, 0)) == -1)
231 return (EINVAL);
232
233 /* Set family */
234 if (*buflen < SADATA_OFFSET)
235 return (ERANGE);
236 sa->sa_family = family;
237
238 /* Set family-specific data and length */
239 switch (sa->sa_family) {
240 case PF_LOCAL: /* Get pathname */
241 {
242 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
243 struct sockaddr_un *const sun = (struct sockaddr_un *)sa;
244 int toklen, pathlen;
245 char *path;
246
247 if ((path = ng_get_string_token(s, off, &toklen, NULL)) == NULL)
248 return (EINVAL);
249 pathlen = strlen(path);
250 if (pathlen > SOCK_MAXADDRLEN) {
251 FREE(path, M_NETGRAPH_KSOCKET);
252 return (E2BIG);
253 }
254 if (*buflen < pathoff + pathlen) {
255 FREE(path, M_NETGRAPH_KSOCKET);
256 return (ERANGE);
257 }
258 *off += toklen;
259 bcopy(path, sun->sun_path, pathlen);
260 sun->sun_len = pathoff + pathlen;
261 FREE(path, M_NETGRAPH_KSOCKET);
262 break;
263 }
264
265 case PF_INET: /* Get an IP address with optional port */
266 {
267 struct sockaddr_in *const sin = (struct sockaddr_in *)sa;
268 int i;
269
270 /* Parse this: <ipaddress>[:port] */
271 for (i = 0; i < 4; i++) {
272 u_long val;
273 char *eptr;
274
275 val = strtoul(s + *off, &eptr, 10);
276 if (val > 0xff || eptr == s + *off)
277 return (EINVAL);
278 *off += (eptr - (s + *off));
279 ((u_char *)&sin->sin_addr)[i] = (u_char)val;
280 if (i < 3) {
281 if (s[*off] != '.')
282 return (EINVAL);
283 (*off)++;
284 } else if (s[*off] == ':') {
285 (*off)++;
286 val = strtoul(s + *off, &eptr, 10);
287 if (val > 0xffff || eptr == s + *off)
288 return (EINVAL);
289 *off += (eptr - (s + *off));
290 sin->sin_port = htons(val);
291 } else
292 sin->sin_port = 0;
293 }
294 bzero(&sin->sin_zero, sizeof(sin->sin_zero));
295 sin->sin_len = sizeof(*sin);
296 break;
297 }
298
299#if 0
300 case PF_APPLETALK: /* XXX implement these someday */
301 case PF_INET6:
302 case PF_IPX:
303#endif
304
305 default:
306 return (EINVAL);
307 }
308
309 /* Done */
310 *buflen = sa->sa_len;
311 return (0);
312}
313
314/* Convert a struct sockaddr from binary to ASCII */
315static int
316ng_ksocket_sockaddr_unparse(const struct ng_parse_type *type,
317 const u_char *data, int *off, char *cbuf, int cbuflen)
318{
319 const struct sockaddr *sa = (const struct sockaddr *)(data + *off);
320 int slen = 0;
321
322 /* Output socket address, either in special or generic format */
323 switch (sa->sa_family) {
324 case PF_LOCAL:
325 {
326 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
327 const struct sockaddr_un *sun = (const struct sockaddr_un *)sa;
328 const int pathlen = sun->sun_len - pathoff;
329 char pathbuf[SOCK_MAXADDRLEN + 1];
330 char *pathtoken;
331
332 bcopy(sun->sun_path, pathbuf, pathlen);
333 if ((pathtoken = ng_encode_string(pathbuf, pathlen)) == NULL)
334 return (ENOMEM);
335 slen += snprintf(cbuf, cbuflen, "local/%s", pathtoken);
336 FREE(pathtoken, M_NETGRAPH_KSOCKET);
337 if (slen >= cbuflen)
338 return (ERANGE);
339 *off += sun->sun_len;
340 return (0);
341 }
342
343 case PF_INET:
344 {
345 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
346
347 slen += snprintf(cbuf, cbuflen, "inet/%d.%d.%d.%d",
348 ((const u_char *)&sin->sin_addr)[0],
349 ((const u_char *)&sin->sin_addr)[1],
350 ((const u_char *)&sin->sin_addr)[2],
351 ((const u_char *)&sin->sin_addr)[3]);
352 if (sin->sin_port != 0) {
353 slen += snprintf(cbuf + strlen(cbuf),
354 cbuflen - strlen(cbuf), ":%d",
355 (u_int)ntohs(sin->sin_port));
356 }
357 if (slen >= cbuflen)
358 return (ERANGE);
359 *off += sizeof(*sin);
360 return(0);
361 }
362
363#if 0
364 case PF_APPLETALK: /* XXX implement these someday */
365 case PF_INET6:
366 case PF_IPX:
367#endif
368
369 default:
370 return (*ng_ksocket_generic_sockaddr_type.supertype->unparse)
371 (&ng_ksocket_generic_sockaddr_type,
372 data, off, cbuf, cbuflen);
373 }
374}
375
376/* Parse type for struct sockaddr */
377static const struct ng_parse_type ng_ksocket_sockaddr_type = {
378 NULL,
379 NULL,
380 NULL,
381 &ng_ksocket_sockaddr_parse,
382 &ng_ksocket_sockaddr_unparse,
383 NULL /* no such thing as a default struct sockaddr */
384};
385
386/************************************************************************
387 STRUCT NG_KSOCKET_SOCKOPT PARSE TYPE
388 ************************************************************************/
389
390/* Get length of the struct ng_ksocket_sockopt value field, which is the
391 just the excess of the message argument portion over the length of
392 the struct ng_ksocket_sockopt. */
393static int
394ng_parse_sockoptval_getLength(const struct ng_parse_type *type,
395 const u_char *start, const u_char *buf)
396{
397 static const int offset = OFFSETOF(struct ng_ksocket_sockopt, value);
398 const struct ng_ksocket_sockopt *sopt;
399 const struct ng_mesg *msg;
400
401 sopt = (const struct ng_ksocket_sockopt *)(buf - offset);
402 msg = (const struct ng_mesg *)((const u_char *)sopt - sizeof(*msg));
403 return msg->header.arglen - sizeof(*sopt);
404}
405
406/* Parse type for the option value part of a struct ng_ksocket_sockopt
407 XXX Eventually, we should handle the different socket options specially.
408 XXX This would avoid byte order problems, eg an integer value of 1 is
409 XXX going to be "[1]" for little endian or "[3=1]" for big endian. */
410static const struct ng_parse_type ng_ksocket_sockoptval_type = {
411 &ng_parse_bytearray_type,
412 &ng_parse_sockoptval_getLength
413};
414
415/* Parse type for struct ng_ksocket_sockopt */
416static const struct ng_parse_struct_info ng_ksocket_sockopt_type_info
417 = NG_KSOCKET_SOCKOPT_INFO(&ng_ksocket_sockoptval_type);
418static const struct ng_parse_type ng_ksocket_sockopt_type = {
419 &ng_parse_struct_type,
420 &ng_ksocket_sockopt_type_info,
421};
422
423/* Parse type for struct ng_ksocket_accept */
424static const struct ng_parse_struct_info ng_ksocket_accept_type_info
425 = NGM_KSOCKET_ACCEPT_INFO;
426static const struct ng_parse_type ng_ksocket_accept_type = {
427 &ng_parse_struct_type,
428 &ng_ksocket_accept_type_info
429};
430
431/* List of commands and how to convert arguments to/from ASCII */
432static const struct ng_cmdlist ng_ksocket_cmds[] = {
433 {
434 NGM_KSOCKET_COOKIE,
435 NGM_KSOCKET_BIND,
436 "bind",
437 &ng_ksocket_sockaddr_type,
438 NULL
439 },
440 {
441 NGM_KSOCKET_COOKIE,
442 NGM_KSOCKET_LISTEN,
443 "listen",
444 &ng_parse_int32_type,
445 NULL
446 },
447 {
448 NGM_KSOCKET_COOKIE,
449 NGM_KSOCKET_ACCEPT,
450 "accept",
451 NULL,
452 &ng_ksocket_accept_type
453 },
454 {
455 NGM_KSOCKET_COOKIE,
456 NGM_KSOCKET_CONNECT,
457 "connect",
458 &ng_ksocket_sockaddr_type,
459 &ng_parse_int32_type
460 },
461 {
462 NGM_KSOCKET_COOKIE,
463 NGM_KSOCKET_GETNAME,
464 "getname",
465 NULL,
466 &ng_ksocket_sockaddr_type
467 },
468 {
469 NGM_KSOCKET_COOKIE,
470 NGM_KSOCKET_GETPEERNAME,
471 "getpeername",
472 NULL,
473 &ng_ksocket_sockaddr_type
474 },
475 {
476 NGM_KSOCKET_COOKIE,
477 NGM_KSOCKET_SETOPT,
478 "setopt",
479 &ng_ksocket_sockopt_type,
480 NULL
481 },
482 {
483 NGM_KSOCKET_COOKIE,
484 NGM_KSOCKET_GETOPT,
485 "getopt",
486 &ng_ksocket_sockopt_type,
487 &ng_ksocket_sockopt_type
488 },
489 { 0 }
490};
491
492/* Node type descriptor */
493static struct ng_type ng_ksocket_typestruct = {
494 NG_ABI_VERSION,
495 NG_KSOCKET_NODE_TYPE,
496 NULL,
497 ng_ksocket_constructor,
498 ng_ksocket_rcvmsg,
499 ng_ksocket_shutdown,
500 ng_ksocket_newhook,
501 NULL,
502 ng_ksocket_connect,
503 ng_ksocket_rcvdata,
504 ng_ksocket_disconnect,
505 ng_ksocket_cmds
506};
507NETGRAPH_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 */
520static int
521ng_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 */
548static int
549ng_ksocket_newhook(node_p node, hook_p hook, const char *name0)
550{
551 struct thread *td = curthread ? curthread : thread0; /* XXX broken */
552 const priv_p priv = NG_NODE_PRIVATE(node);
553 char *s1, *s2, name[NG_HOOKLEN+1];
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 */
| 40 * $Whistle: ng_ksocket.c,v 1.1 1999/11/16 20:04:40 archie Exp $
41 */
42
43/*
44 * Kernel socket node type. This node type is basically a kernel-mode
45 * version of a socket... kindof like the reverse of the socket node type.
46 */
47
48#include <sys/param.h>
49#include <sys/systm.h>
50#include <sys/kernel.h>
51#include <sys/mbuf.h>
52#include <sys/proc.h>
53#include <sys/malloc.h>
54#include <sys/ctype.h>
55#include <sys/protosw.h>
56#include <sys/errno.h>
57#include <sys/socket.h>
58#include <sys/socketvar.h>
59#include <sys/uio.h>
60#include <sys/un.h>
61
62#include <netgraph/ng_message.h>
63#include <netgraph/netgraph.h>
64#include <netgraph/ng_parse.h>
65#include <netgraph/ng_ksocket.h>
66
67#include <netinet/in.h>
68#include <netatalk/at.h>
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 LIST_HEAD(, ng_ksocket_private) embryos;
85 LIST_ENTRY(ng_ksocket_private) siblings;
86 u_int32_t flags;
87 u_int32_t response_token;
88 ng_ID_t response_addr;
89};
90typedef struct ng_ksocket_private *priv_p;
91
92/* Flags for priv_p */
93#define KSF_CONNECTING 0x00000001 /* Waiting for connection complete */
94#define KSF_ACCEPTING 0x00000002 /* Waiting for accept complete */
95#define KSF_EOFSEEN 0x00000004 /* Have sent 0-length EOF mbuf */
96#define KSF_CLONED 0x00000008 /* Cloned from an accepting socket */
97#define KSF_EMBRYONIC 0x00000010 /* Cloned node with no hooks yet */
98
99/* Netgraph node methods */
100static ng_constructor_t ng_ksocket_constructor;
101static ng_rcvmsg_t ng_ksocket_rcvmsg;
102static ng_shutdown_t ng_ksocket_shutdown;
103static ng_newhook_t ng_ksocket_newhook;
104static ng_rcvdata_t ng_ksocket_rcvdata;
105static ng_connect_t ng_ksocket_connect;
106static ng_disconnect_t ng_ksocket_disconnect;
107
108/* Alias structure */
109struct ng_ksocket_alias {
110 const char *name;
111 const int value;
112 const int family;
113};
114
115/* Protocol family aliases */
116static const struct ng_ksocket_alias ng_ksocket_families[] = {
117 { "local", PF_LOCAL },
118 { "inet", PF_INET },
119 { "inet6", PF_INET6 },
120 { "atalk", PF_APPLETALK },
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 { "ddp", ATPROTO_DDP, PF_APPLETALK },
151 { "aarp", ATPROTO_AARP, PF_APPLETALK },
152 { NULL, -1 },
153};
154
155/* Helper functions */
156static int ng_ksocket_check_accept(priv_p);
157static void ng_ksocket_finish_accept(priv_p);
158static void ng_ksocket_incoming(struct socket *so, void *arg, int waitflag);
159static int ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
160 const char *s, int family);
161static void ng_ksocket_incoming2(node_p node, hook_p hook,
162 void *arg1, int waitflag);
163
164/************************************************************************
165 STRUCT SOCKADDR PARSE TYPE
166 ************************************************************************/
167
168/* Get the length of the data portion of a generic struct sockaddr */
169static int
170ng_parse_generic_sockdata_getLength(const struct ng_parse_type *type,
171 const u_char *start, const u_char *buf)
172{
173 const struct sockaddr *sa;
174
175 sa = (const struct sockaddr *)(buf - SADATA_OFFSET);
176 return (sa->sa_len < SADATA_OFFSET) ? 0 : sa->sa_len - SADATA_OFFSET;
177}
178
179/* Type for the variable length data portion of a generic struct sockaddr */
180static const struct ng_parse_type ng_ksocket_generic_sockdata_type = {
181 &ng_parse_bytearray_type,
182 &ng_parse_generic_sockdata_getLength
183};
184
185/* Type for a generic struct sockaddr */
186static const struct ng_parse_struct_info ng_parse_generic_sockaddr_type_info = {
187 {
188 { "len", &ng_parse_uint8_type },
189 { "family", &ng_parse_uint8_type },
190 { "data", &ng_ksocket_generic_sockdata_type },
191 { NULL }
192 }
193};
194static const struct ng_parse_type ng_ksocket_generic_sockaddr_type = {
195 &ng_parse_struct_type,
196 &ng_parse_generic_sockaddr_type_info
197};
198
199/* Convert a struct sockaddr from ASCII to binary. If its a protocol
200 family that we specially handle, do that, otherwise defer to the
201 generic parse type ng_ksocket_generic_sockaddr_type. */
202static int
203ng_ksocket_sockaddr_parse(const struct ng_parse_type *type,
204 const char *s, int *off, const u_char *const start,
205 u_char *const buf, int *buflen)
206{
207 struct sockaddr *const sa = (struct sockaddr *)buf;
208 enum ng_parse_token tok;
209 char fambuf[32];
210 int family, len;
211 char *t;
212
213 /* If next token is a left curly brace, use generic parse type */
214 if ((tok = ng_parse_get_token(s, off, &len)) == T_LBRACE) {
215 return (*ng_ksocket_generic_sockaddr_type.supertype->parse)
216 (&ng_ksocket_generic_sockaddr_type,
217 s, off, start, buf, buflen);
218 }
219
220 /* Get socket address family followed by a slash */
221 while (isspace(s[*off]))
222 (*off)++;
223 if ((t = index(s + *off, '/')) == NULL)
224 return (EINVAL);
225 if ((len = t - (s + *off)) > sizeof(fambuf) - 1)
226 return (EINVAL);
227 strncpy(fambuf, s + *off, len);
228 fambuf[len] = '\0';
229 *off += len + 1;
230 if ((family = ng_ksocket_parse(ng_ksocket_families, fambuf, 0)) == -1)
231 return (EINVAL);
232
233 /* Set family */
234 if (*buflen < SADATA_OFFSET)
235 return (ERANGE);
236 sa->sa_family = family;
237
238 /* Set family-specific data and length */
239 switch (sa->sa_family) {
240 case PF_LOCAL: /* Get pathname */
241 {
242 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
243 struct sockaddr_un *const sun = (struct sockaddr_un *)sa;
244 int toklen, pathlen;
245 char *path;
246
247 if ((path = ng_get_string_token(s, off, &toklen, NULL)) == NULL)
248 return (EINVAL);
249 pathlen = strlen(path);
250 if (pathlen > SOCK_MAXADDRLEN) {
251 FREE(path, M_NETGRAPH_KSOCKET);
252 return (E2BIG);
253 }
254 if (*buflen < pathoff + pathlen) {
255 FREE(path, M_NETGRAPH_KSOCKET);
256 return (ERANGE);
257 }
258 *off += toklen;
259 bcopy(path, sun->sun_path, pathlen);
260 sun->sun_len = pathoff + pathlen;
261 FREE(path, M_NETGRAPH_KSOCKET);
262 break;
263 }
264
265 case PF_INET: /* Get an IP address with optional port */
266 {
267 struct sockaddr_in *const sin = (struct sockaddr_in *)sa;
268 int i;
269
270 /* Parse this: <ipaddress>[:port] */
271 for (i = 0; i < 4; i++) {
272 u_long val;
273 char *eptr;
274
275 val = strtoul(s + *off, &eptr, 10);
276 if (val > 0xff || eptr == s + *off)
277 return (EINVAL);
278 *off += (eptr - (s + *off));
279 ((u_char *)&sin->sin_addr)[i] = (u_char)val;
280 if (i < 3) {
281 if (s[*off] != '.')
282 return (EINVAL);
283 (*off)++;
284 } else if (s[*off] == ':') {
285 (*off)++;
286 val = strtoul(s + *off, &eptr, 10);
287 if (val > 0xffff || eptr == s + *off)
288 return (EINVAL);
289 *off += (eptr - (s + *off));
290 sin->sin_port = htons(val);
291 } else
292 sin->sin_port = 0;
293 }
294 bzero(&sin->sin_zero, sizeof(sin->sin_zero));
295 sin->sin_len = sizeof(*sin);
296 break;
297 }
298
299#if 0
300 case PF_APPLETALK: /* XXX implement these someday */
301 case PF_INET6:
302 case PF_IPX:
303#endif
304
305 default:
306 return (EINVAL);
307 }
308
309 /* Done */
310 *buflen = sa->sa_len;
311 return (0);
312}
313
314/* Convert a struct sockaddr from binary to ASCII */
315static int
316ng_ksocket_sockaddr_unparse(const struct ng_parse_type *type,
317 const u_char *data, int *off, char *cbuf, int cbuflen)
318{
319 const struct sockaddr *sa = (const struct sockaddr *)(data + *off);
320 int slen = 0;
321
322 /* Output socket address, either in special or generic format */
323 switch (sa->sa_family) {
324 case PF_LOCAL:
325 {
326 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
327 const struct sockaddr_un *sun = (const struct sockaddr_un *)sa;
328 const int pathlen = sun->sun_len - pathoff;
329 char pathbuf[SOCK_MAXADDRLEN + 1];
330 char *pathtoken;
331
332 bcopy(sun->sun_path, pathbuf, pathlen);
333 if ((pathtoken = ng_encode_string(pathbuf, pathlen)) == NULL)
334 return (ENOMEM);
335 slen += snprintf(cbuf, cbuflen, "local/%s", pathtoken);
336 FREE(pathtoken, M_NETGRAPH_KSOCKET);
337 if (slen >= cbuflen)
338 return (ERANGE);
339 *off += sun->sun_len;
340 return (0);
341 }
342
343 case PF_INET:
344 {
345 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
346
347 slen += snprintf(cbuf, cbuflen, "inet/%d.%d.%d.%d",
348 ((const u_char *)&sin->sin_addr)[0],
349 ((const u_char *)&sin->sin_addr)[1],
350 ((const u_char *)&sin->sin_addr)[2],
351 ((const u_char *)&sin->sin_addr)[3]);
352 if (sin->sin_port != 0) {
353 slen += snprintf(cbuf + strlen(cbuf),
354 cbuflen - strlen(cbuf), ":%d",
355 (u_int)ntohs(sin->sin_port));
356 }
357 if (slen >= cbuflen)
358 return (ERANGE);
359 *off += sizeof(*sin);
360 return(0);
361 }
362
363#if 0
364 case PF_APPLETALK: /* XXX implement these someday */
365 case PF_INET6:
366 case PF_IPX:
367#endif
368
369 default:
370 return (*ng_ksocket_generic_sockaddr_type.supertype->unparse)
371 (&ng_ksocket_generic_sockaddr_type,
372 data, off, cbuf, cbuflen);
373 }
374}
375
376/* Parse type for struct sockaddr */
377static const struct ng_parse_type ng_ksocket_sockaddr_type = {
378 NULL,
379 NULL,
380 NULL,
381 &ng_ksocket_sockaddr_parse,
382 &ng_ksocket_sockaddr_unparse,
383 NULL /* no such thing as a default struct sockaddr */
384};
385
386/************************************************************************
387 STRUCT NG_KSOCKET_SOCKOPT PARSE TYPE
388 ************************************************************************/
389
390/* Get length of the struct ng_ksocket_sockopt value field, which is the
391 just the excess of the message argument portion over the length of
392 the struct ng_ksocket_sockopt. */
393static int
394ng_parse_sockoptval_getLength(const struct ng_parse_type *type,
395 const u_char *start, const u_char *buf)
396{
397 static const int offset = OFFSETOF(struct ng_ksocket_sockopt, value);
398 const struct ng_ksocket_sockopt *sopt;
399 const struct ng_mesg *msg;
400
401 sopt = (const struct ng_ksocket_sockopt *)(buf - offset);
402 msg = (const struct ng_mesg *)((const u_char *)sopt - sizeof(*msg));
403 return msg->header.arglen - sizeof(*sopt);
404}
405
406/* Parse type for the option value part of a struct ng_ksocket_sockopt
407 XXX Eventually, we should handle the different socket options specially.
408 XXX This would avoid byte order problems, eg an integer value of 1 is
409 XXX going to be "[1]" for little endian or "[3=1]" for big endian. */
410static const struct ng_parse_type ng_ksocket_sockoptval_type = {
411 &ng_parse_bytearray_type,
412 &ng_parse_sockoptval_getLength
413};
414
415/* Parse type for struct ng_ksocket_sockopt */
416static const struct ng_parse_struct_info ng_ksocket_sockopt_type_info
417 = NG_KSOCKET_SOCKOPT_INFO(&ng_ksocket_sockoptval_type);
418static const struct ng_parse_type ng_ksocket_sockopt_type = {
419 &ng_parse_struct_type,
420 &ng_ksocket_sockopt_type_info,
421};
422
423/* Parse type for struct ng_ksocket_accept */
424static const struct ng_parse_struct_info ng_ksocket_accept_type_info
425 = NGM_KSOCKET_ACCEPT_INFO;
426static const struct ng_parse_type ng_ksocket_accept_type = {
427 &ng_parse_struct_type,
428 &ng_ksocket_accept_type_info
429};
430
431/* List of commands and how to convert arguments to/from ASCII */
432static const struct ng_cmdlist ng_ksocket_cmds[] = {
433 {
434 NGM_KSOCKET_COOKIE,
435 NGM_KSOCKET_BIND,
436 "bind",
437 &ng_ksocket_sockaddr_type,
438 NULL
439 },
440 {
441 NGM_KSOCKET_COOKIE,
442 NGM_KSOCKET_LISTEN,
443 "listen",
444 &ng_parse_int32_type,
445 NULL
446 },
447 {
448 NGM_KSOCKET_COOKIE,
449 NGM_KSOCKET_ACCEPT,
450 "accept",
451 NULL,
452 &ng_ksocket_accept_type
453 },
454 {
455 NGM_KSOCKET_COOKIE,
456 NGM_KSOCKET_CONNECT,
457 "connect",
458 &ng_ksocket_sockaddr_type,
459 &ng_parse_int32_type
460 },
461 {
462 NGM_KSOCKET_COOKIE,
463 NGM_KSOCKET_GETNAME,
464 "getname",
465 NULL,
466 &ng_ksocket_sockaddr_type
467 },
468 {
469 NGM_KSOCKET_COOKIE,
470 NGM_KSOCKET_GETPEERNAME,
471 "getpeername",
472 NULL,
473 &ng_ksocket_sockaddr_type
474 },
475 {
476 NGM_KSOCKET_COOKIE,
477 NGM_KSOCKET_SETOPT,
478 "setopt",
479 &ng_ksocket_sockopt_type,
480 NULL
481 },
482 {
483 NGM_KSOCKET_COOKIE,
484 NGM_KSOCKET_GETOPT,
485 "getopt",
486 &ng_ksocket_sockopt_type,
487 &ng_ksocket_sockopt_type
488 },
489 { 0 }
490};
491
492/* Node type descriptor */
493static struct ng_type ng_ksocket_typestruct = {
494 NG_ABI_VERSION,
495 NG_KSOCKET_NODE_TYPE,
496 NULL,
497 ng_ksocket_constructor,
498 ng_ksocket_rcvmsg,
499 ng_ksocket_shutdown,
500 ng_ksocket_newhook,
501 NULL,
502 ng_ksocket_connect,
503 ng_ksocket_rcvdata,
504 ng_ksocket_disconnect,
505 ng_ksocket_cmds
506};
507NETGRAPH_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 */
520static int
521ng_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 */
548static int
549ng_ksocket_newhook(node_p node, hook_p hook, const char *name0)
550{
551 struct thread *td = curthread ? curthread : thread0; /* XXX broken */
552 const priv_p priv = NG_NODE_PRIVATE(node);
553 char *s1, *s2, name[NG_HOOKLEN+1];
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 */
|
590 if (error != 0)
591 return (error);
592
593 /* XXX call soreserve() ? */
594
595 }
596
597 /* OK */
598 priv->hook = hook;
599 return(0);
600}
601
602static int
603ng_ksocket_connect(hook_p hook)
604{
605 node_p node = NG_HOOK_NODE(hook);
606 const priv_p priv = NG_NODE_PRIVATE(node);
607 struct socket *const so = priv->so;
608
609 /* Add our hook for incoming data and other events */
610 priv->so->so_upcallarg = (caddr_t)node;
611 priv->so->so_upcall = ng_ksocket_incoming;
612 priv->so->so_rcv.sb_flags |= SB_UPCALL;
613 priv->so->so_snd.sb_flags |= SB_UPCALL;
614 priv->so->so_state |= SS_NBIO;
615 /*
616 * --Original comment--
617 * On a cloned socket we may have already received one or more
618 * upcalls which we couldn't handle without a hook. Handle
619 * those now.
620 * We cannot call the upcall function directly
621 * from here, because until this function has returned our
622 * hook isn't connected.
623 *
624 * ---meta comment for -current ---
625 * XXX This is dubius.
626 * Upcalls between the time that the hook was
627 * first created and now (on another processesor) will
628 * be earlier on the queue than the request to finalise the hook.
629 * By the time the hook is finalised,
630 * The queued upcalls will have happenned and the code
631 * will have discarded them because of a lack of a hook.
632 * (socket not open).
633 *
634 * This is a bad byproduct of the complicated way in which hooks
635 * are now created (3 daisy chained async events).
636 *
637 * Since we are a netgraph operation
638 * We know that we hold a lock on this node. This forces the
639 * request we make below to be queued rather than implemented
640 * immediatly which will cause the upcall function to be called a bit
641 * later.
642 * However, as we will run any waiting queued operations immediatly
643 * after doing this one, if we have not finalised the other end
644 * of the hook, those queued operations will fail.
645 */
646 if (priv->flags & KSF_CLONED) {
647 ng_send_fn(node, NULL, &ng_ksocket_incoming2, so, M_NOWAIT);
648 }
649
650 return (0);
651}
652
653/*
654 * Receive a control message
655 */
656static int
657ng_ksocket_rcvmsg(node_p node, item_p item, hook_p lasthook)
658{
659 struct thread *td = curthread ? curthread : thread0; /* XXX broken */
660 const priv_p priv = NG_NODE_PRIVATE(node);
661 struct socket *const so = priv->so;
662 struct ng_mesg *resp = NULL;
663 int error = 0;
664 struct ng_mesg *msg;
665 ng_ID_t raddr;
666
667 NGI_GET_MSG(item, msg);
668 switch (msg->header.typecookie) {
669 case NGM_KSOCKET_COOKIE:
670 switch (msg->header.cmd) {
671 case NGM_KSOCKET_BIND:
672 {
673 struct sockaddr *const sa
674 = (struct sockaddr *)msg->data;
675
676 /* Sanity check */
677 if (msg->header.arglen < SADATA_OFFSET
678 || msg->header.arglen < sa->sa_len)
679 ERROUT(EINVAL);
680 if (so == NULL)
681 ERROUT(ENXIO);
682
683 /* Bind */
684 error = sobind(so, sa, td);
685 break;
686 }
687 case NGM_KSOCKET_LISTEN:
688 {
689 /* Sanity check */
690 if (msg->header.arglen != sizeof(int32_t))
691 ERROUT(EINVAL);
692 if (so == NULL)
693 ERROUT(ENXIO);
694
695 /* Listen */
696 error = solisten(so, *((int32_t *)msg->data), td);
697 break;
698 }
699
700 case NGM_KSOCKET_ACCEPT:
701 {
702 /* Sanity check */
703 if (msg->header.arglen != 0)
704 ERROUT(EINVAL);
705 if (so == NULL)
706 ERROUT(ENXIO);
707
708 /* Make sure the socket is capable of accepting */
709 if (!(so->so_options & SO_ACCEPTCONN))
710 ERROUT(EINVAL);
711 if (priv->flags & KSF_ACCEPTING)
712 ERROUT(EALREADY);
713
714 error = ng_ksocket_check_accept(priv);
715 if (error != 0 && error != EWOULDBLOCK)
716 ERROUT(error);
717
718 /*
719 * If a connection is already complete, take it.
720 * Otherwise let the upcall function deal with
721 * the connection when it comes in.
722 */
723 priv->response_token = msg->header.token;
724 raddr = priv->response_addr;
725 if (error == 0) {
726 ng_ksocket_finish_accept(priv);
727 } else
728 priv->flags |= KSF_ACCEPTING;
729 break;
730 }
731
732 case NGM_KSOCKET_CONNECT:
733 {
734 struct sockaddr *const sa
735 = (struct sockaddr *)msg->data;
736
737 /* Sanity check */
738 if (msg->header.arglen < SADATA_OFFSET
739 || msg->header.arglen < sa->sa_len)
740 ERROUT(EINVAL);
741 if (so == NULL)
742 ERROUT(ENXIO);
743
744 /* Do connect */
745 if ((so->so_state & SS_ISCONNECTING) != 0)
746 ERROUT(EALREADY);
747 if ((error = soconnect(so, sa, td)) != 0) {
748 so->so_state &= ~SS_ISCONNECTING;
749 ERROUT(error);
750 }
751 if ((so->so_state & SS_ISCONNECTING) != 0)
752 /* We will notify the sender when we connect */
753 priv->response_token = msg->header.token;
754 raddr = priv->response_addr;
755 priv->flags |= KSF_CONNECTING;
756 ERROUT(EINPROGRESS);
757 break;
758 }
759
760 case NGM_KSOCKET_GETNAME:
761 case NGM_KSOCKET_GETPEERNAME:
762 {
763 int (*func)(struct socket *so, struct sockaddr **nam);
764 struct sockaddr *sa = NULL;
765 int len;
766
767 /* Sanity check */
768 if (msg->header.arglen != 0)
769 ERROUT(EINVAL);
770 if (so == NULL)
771 ERROUT(ENXIO);
772
773 /* Get function */
774 if (msg->header.cmd == NGM_KSOCKET_GETPEERNAME) {
775 if ((so->so_state
776 & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0)
777 ERROUT(ENOTCONN);
778 func = so->so_proto->pr_usrreqs->pru_peeraddr;
779 } else
780 func = so->so_proto->pr_usrreqs->pru_sockaddr;
781
782 /* Get local or peer address */
783 if ((error = (*func)(so, &sa)) != 0)
784 goto bail;
785 len = (sa == NULL) ? 0 : sa->sa_len;
786
787 /* Send it back in a response */
788 NG_MKRESPONSE(resp, msg, len, M_NOWAIT);
789 if (resp == NULL) {
790 error = ENOMEM;
791 goto bail;
792 }
793 bcopy(sa, resp->data, len);
794
795 bail:
796 /* Cleanup */
797 if (sa != NULL)
798 FREE(sa, M_SONAME);
799 break;
800 }
801
802 case NGM_KSOCKET_GETOPT:
803 {
804 struct ng_ksocket_sockopt *ksopt =
805 (struct ng_ksocket_sockopt *)msg->data;
806 struct sockopt sopt;
807
808 /* Sanity check */
809 if (msg->header.arglen != sizeof(*ksopt))
810 ERROUT(EINVAL);
811 if (so == NULL)
812 ERROUT(ENXIO);
813
814 /* Get response with room for option value */
815 NG_MKRESPONSE(resp, msg, sizeof(*ksopt)
816 + NG_KSOCKET_MAX_OPTLEN, M_NOWAIT);
817 if (resp == NULL)
818 ERROUT(ENOMEM);
819
820 /* Get socket option, and put value in the response */
821 sopt.sopt_dir = SOPT_GET;
822 sopt.sopt_level = ksopt->level;
823 sopt.sopt_name = ksopt->name;
824 sopt.sopt_td = NULL;
825 sopt.sopt_valsize = NG_KSOCKET_MAX_OPTLEN;
826 ksopt = (struct ng_ksocket_sockopt *)resp->data;
827 sopt.sopt_val = ksopt->value;
828 if ((error = sogetopt(so, &sopt)) != 0) {
829 NG_FREE_MSG(resp);
830 break;
831 }
832
833 /* Set actual value length */
834 resp->header.arglen = sizeof(*ksopt)
835 + sopt.sopt_valsize;
836 break;
837 }
838
839 case NGM_KSOCKET_SETOPT:
840 {
841 struct ng_ksocket_sockopt *const ksopt =
842 (struct ng_ksocket_sockopt *)msg->data;
843 const int valsize = msg->header.arglen - sizeof(*ksopt);
844 struct sockopt sopt;
845
846 /* Sanity check */
847 if (valsize < 0)
848 ERROUT(EINVAL);
849 if (so == NULL)
850 ERROUT(ENXIO);
851
852 /* Set socket option */
853 sopt.sopt_dir = SOPT_SET;
854 sopt.sopt_level = ksopt->level;
855 sopt.sopt_name = ksopt->name;
856 sopt.sopt_val = ksopt->value;
857 sopt.sopt_valsize = valsize;
858 sopt.sopt_td = NULL;
859 error = sosetopt(so, &sopt);
860 break;
861 }
862
863 default:
864 error = EINVAL;
865 break;
866 }
867 break;
868 default:
869 error = EINVAL;
870 break;
871 }
872done:
873 NG_RESPOND_MSG(error, node, item, resp);
874 NG_FREE_MSG(msg);
875 return (error);
876}
877
878/*
879 * Receive incoming data on our hook. Send it out the socket.
880 */
881static int
882ng_ksocket_rcvdata(hook_p hook, item_p item)
883{
884 struct thread *td = curthread ? curthread : thread0; /* XXX broken */
885 const node_p node = NG_HOOK_NODE(hook);
886 const priv_p priv = NG_NODE_PRIVATE(node);
887 struct socket *const so = priv->so;
888 struct sockaddr *sa = NULL;
889 meta_p meta;
890 int error;
891 struct mbuf *m;
892
893 /* Extract data and meta information */
894 NGI_GET_M(item, m);
895 NGI_GET_META(item, meta);
896 NG_FREE_ITEM(item);
897
898 /* If any meta info, look for peer socket address */
899 if (meta != NULL) {
900 struct meta_field_header *field;
901
902 /* Look for peer socket address */
903 for (field = &meta->options[0];
904 (caddr_t)field < (caddr_t)meta + meta->used_len;
905 field = (struct meta_field_header *)
906 ((caddr_t)field + field->len)) {
907 if (field->cookie != NGM_KSOCKET_COOKIE
908 || field->type != NG_KSOCKET_META_SOCKADDR)
909 continue;
910 sa = (struct sockaddr *)field->data;
911 break;
912 }
913 }
914
915 /* Send packet */
916 error = (*so->so_proto->pr_usrreqs->pru_sosend)(so, sa, 0, m, 0, 0, td);
917
918 /* Clean up and exit */
919 NG_FREE_META(meta);
920 return (error);
921}
922
923/*
924 * Destroy node
925 */
926static int
927ng_ksocket_shutdown(node_p node)
928{
929 const priv_p priv = NG_NODE_PRIVATE(node);
930 priv_p embryo;
931
932 /* Close our socket (if any) */
933 if (priv->so != NULL) {
934 priv->so->so_upcall = NULL;
935 priv->so->so_rcv.sb_flags &= ~SB_UPCALL;
936 priv->so->so_snd.sb_flags &= ~SB_UPCALL;
937 soclose(priv->so);
938 priv->so = NULL;
939 }
940
941 /* If we are an embryo, take ourselves out of the parent's list */
942 if (priv->flags & KSF_EMBRYONIC) {
943 LIST_REMOVE(priv, siblings);
944 priv->flags &= ~KSF_EMBRYONIC;
945 }
946
947 /* Remove any embryonic children we have */
948 while (!LIST_EMPTY(&priv->embryos)) {
949 embryo = LIST_FIRST(&priv->embryos);
950 ng_rmnode_self(embryo->node);
951 }
952
953 /* Take down netgraph node */
954 bzero(priv, sizeof(*priv));
955 FREE(priv, M_NETGRAPH_KSOCKET);
956 NG_NODE_SET_PRIVATE(node, NULL);
957 NG_NODE_UNREF(node); /* let the node escape */
958 return (0);
959}
960
961/*
962 * Hook disconnection
963 */
964static int
965ng_ksocket_disconnect(hook_p hook)
966{
967 KASSERT(NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0,
968 ("%s: numhooks=%d?", __func__,
969 NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook))));
970 if (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))
971 ng_rmnode_self(NG_HOOK_NODE(hook));
972 return (0);
973}
974
975/************************************************************************
976 HELPER STUFF
977 ************************************************************************/
978/*
979 * You should no-longer "just call" a netgraph node function
980 * from an external asynchronous event.
981 * This is because in doing so you are ignoring the locking on the netgraph
982 * nodes. Instead call your function via
983 * "int ng_send_fn(node_p node, hook_p hook, ng_item_fn *fn,
984 * void *arg1, int arg2);"
985 * this will call the function you chose, but will first do all the
986 * locking rigmarole. Your function MAY only be called at some distant future
987 * time (several millisecs away) so don't give it any arguments
988 * that may be revoked soon (e.g. on your stack).
989 * In this case even the 'so' argument is doubtful.
990 * While the function request is being processed the node
991 * has an extra reference and as such will not disappear until
992 * the request has at least been done, but the 'so' may not be so lucky.
993 * handle this by checking the validity of the node in the target function
994 * before dereferencing the socket pointer.
995 */
996
997static void
998ng_ksocket_incoming(struct socket *so, void *arg, int waitflag)
999{
1000 const node_p node = arg;
1001
1002 ng_send_fn(node, NULL, &ng_ksocket_incoming2, so, waitflag);
1003}
1004
1005
1006/*
1007 * When incoming data is appended to the socket, we get notified here.
1008 * This is also called whenever a significant event occurs for the socket.
1009 * We know that HOOK is NULL. Because of how we were called we know we have a
1010 * lock on this node an are participating inthe netgraph locking.
1011 * Our original caller may have queued this even some time ago and
1012 * we cannot trust that he even still exists. The node however is being
1013 * held with a reference by the queueing code, at least until we finish,
1014 * even if it has been zapped, so first check it's validiy
1015 * before we trust the socket (which was derived from it).
1016 */
1017static void
1018ng_ksocket_incoming2(node_p node, hook_p hook, void *arg1, int waitflag)
1019{
1020 struct socket *so = arg1;
1021 const priv_p priv = NG_NODE_PRIVATE(node);
1022 struct mbuf *m;
1023 struct ng_mesg *response;
1024 struct uio auio;
1025 int s, flags, error;
1026
1027 s = splnet();
1028
1029 /* Sanity check */
1030 if (NG_NODE_NOT_VALID(node)) {
1031 splx(s);
1032 return;
1033 }
1034 /* so = priv->so; *//* XXX could have derived this like so */
1035 KASSERT(so == priv->so, ("%s: wrong socket", __func__));
1036
1037 /* Check whether a pending connect operation has completed */
1038 if (priv->flags & KSF_CONNECTING) {
1039 if ((error = so->so_error) != 0) {
1040 so->so_error = 0;
1041 so->so_state &= ~SS_ISCONNECTING;
1042 }
1043 if (!(so->so_state & SS_ISCONNECTING)) {
1044 NG_MKMESSAGE(response, NGM_KSOCKET_COOKIE,
1045 NGM_KSOCKET_CONNECT, sizeof(int32_t), waitflag);
1046 if (response != NULL) {
1047 response->header.flags |= NGF_RESP;
1048 response->header.token = priv->response_token;
1049 *(int32_t *)response->data = error;
1050 /*
1051 * send an async "response" message
1052 * to the node that set us up
1053 * (if it still exists)
1054 */
1055 NG_SEND_MSG_ID(error, node, response,
1056 priv->response_addr, NULL);
1057 }
1058 priv->flags &= ~KSF_CONNECTING;
1059 }
1060 }
1061
1062 /* Check whether a pending accept operation has completed */
1063 if (priv->flags & KSF_ACCEPTING) {
1064 error = ng_ksocket_check_accept(priv);
1065 if (error != EWOULDBLOCK)
1066 priv->flags &= ~KSF_ACCEPTING;
1067 if (error == 0)
1068 ng_ksocket_finish_accept(priv);
1069 }
1070
1071 /*
1072 * If we don't have a hook, we must handle data events later. When
1073 * the hook gets created and is connected, this upcall function
1074 * will be called again.
1075 */
1076 if (priv->hook == NULL) {
1077 splx(s);
1078 return;
1079 }
1080
1081 /* Read and forward available mbuf's */
1082 auio.uio_td = NULL;
1083 auio.uio_resid = 1000000000;
1084 flags = MSG_DONTWAIT;
1085 while (1) {
1086 struct sockaddr *sa = NULL;
1087 meta_p meta = NULL;
1088 struct mbuf *n;
1089
1090 /* Try to get next packet from socket */
1091 if ((error = (*so->so_proto->pr_usrreqs->pru_soreceive)
1092 (so, (so->so_state & SS_ISCONNECTED) ? NULL : &sa,
1093 &auio, &m, (struct mbuf **)0, &flags)) != 0)
1094 break;
1095
1096 /* See if we got anything */
1097 if (m == NULL) {
1098 if (sa != NULL)
1099 FREE(sa, M_SONAME);
1100 break;
1101 }
1102
1103 /* Don't trust the various socket layers to get the
1104 packet header and length correct (eg. kern/15175) */
1105 for (n = m, m->m_pkthdr.len = 0; n != NULL; n = n->m_next)
1106 m->m_pkthdr.len += n->m_len;
1107
1108 /* Put peer's socket address (if any) into a meta info blob */
1109 if (sa != NULL) {
1110 struct meta_field_header *mhead;
1111 u_int len;
1112
1113 len = sizeof(*meta) + sizeof(*mhead) + sa->sa_len;
1114 MALLOC(meta, meta_p, len, M_NETGRAPH_META, M_NOWAIT);
1115 if (meta == NULL) {
1116 FREE(sa, M_SONAME);
1117 goto sendit;
1118 }
1119 mhead = &meta->options[0];
1120 bzero(meta, sizeof(*meta));
1121 bzero(mhead, sizeof(*mhead));
1122 meta->allocated_len = len;
1123 meta->used_len = len;
1124 mhead->cookie = NGM_KSOCKET_COOKIE;
1125 mhead->type = NG_KSOCKET_META_SOCKADDR;
1126 mhead->len = sizeof(*mhead) + sa->sa_len;
1127 bcopy(sa, mhead->data, sa->sa_len);
1128 FREE(sa, M_SONAME);
1129 }
1130
1131sendit: /* Forward data with optional peer sockaddr as meta info */
1132 NG_SEND_DATA(error, priv->hook, m, meta);
1133 }
1134
1135 /*
1136 * If the peer has closed the connection, forward a 0-length mbuf
1137 * to indicate end-of-file.
1138 */
1139 if (so->so_state & SS_CANTRCVMORE && !(priv->flags & KSF_EOFSEEN)) {
1140 MGETHDR(m, waitflag, MT_DATA);
1141 if (m != NULL) {
1142 m->m_len = m->m_pkthdr.len = 0;
1143 NG_SEND_DATA_ONLY(error, priv->hook, m);
1144 }
1145 priv->flags |= KSF_EOFSEEN;
1146 }
1147 splx(s);
1148}
1149
1150/*
1151 * Check for a completed incoming connection and return 0 if one is found.
1152 * Otherwise return the appropriate error code.
1153 */
1154static int
1155ng_ksocket_check_accept(priv_p priv)
1156{
1157 struct socket *const head = priv->so;
1158 int error;
1159
1160 if ((error = head->so_error) != 0) {
1161 head->so_error = 0;
1162 return error;
1163 }
1164 if (TAILQ_EMPTY(&head->so_comp)) {
1165 if (head->so_state & SS_CANTRCVMORE)
1166 return ECONNABORTED;
1167 return EWOULDBLOCK;
1168 }
1169 return 0;
1170}
1171
1172/*
1173 * Handle the first completed incoming connection, assumed to be already
1174 * on the socket's so_comp queue.
1175 */
1176static void
1177ng_ksocket_finish_accept(priv_p priv)
1178{
1179 struct socket *const head = priv->so;
1180 struct socket *so;
1181 struct sockaddr *sa = NULL;
1182 struct ng_mesg *resp;
1183 struct ng_ksocket_accept *resp_data;
1184 node_p node;
1185 priv_p priv2;
1186 int len;
1187 int error;
1188
1189 so = TAILQ_FIRST(&head->so_comp);
1190 if (so == NULL) /* Should never happen */
1191 return;
1192 TAILQ_REMOVE(&head->so_comp, so, so_list);
1193 head->so_qlen--;
1194
1195 /* XXX KNOTE(&head->so_rcv.sb_sel.si_note, 0); */
1196
1197 so->so_state &= ~SS_COMP;
1198 so->so_state |= SS_NBIO;
1199 so->so_head = NULL;
1200
1201 soaccept(so, &sa);
1202
1203 len = OFFSETOF(struct ng_ksocket_accept, addr);
1204 if (sa != NULL)
1205 len += sa->sa_len;
1206
1207 NG_MKMESSAGE(resp, NGM_KSOCKET_COOKIE, NGM_KSOCKET_ACCEPT, len,
1208 M_NOWAIT);
1209 if (resp == NULL) {
1210 soclose(so);
1211 goto out;
1212 }
1213 resp->header.flags |= NGF_RESP;
1214 resp->header.token = priv->response_token;
1215
1216 /* Clone a ksocket node to wrap the new socket */
1217 error = ng_make_node_common(&ng_ksocket_typestruct, &node);
1218 if (error) {
1219 FREE(resp, M_NETGRAPH);
1220 soclose(so);
1221 goto out;
1222 }
1223
1224 if (ng_ksocket_constructor(node) != 0) {
1225 NG_NODE_UNREF(node);
1226 FREE(resp, M_NETGRAPH);
1227 soclose(so);
1228 goto out;
1229 }
1230
1231 priv2 = NG_NODE_PRIVATE(node);
1232 priv2->so = so;
1233 priv2->flags |= KSF_CLONED | KSF_EMBRYONIC;
1234
1235 /*
1236 * Insert the cloned node into a list of embryonic children
1237 * on the parent node. When a hook is created on the cloned
1238 * node it will be removed from this list. When the parent
1239 * is destroyed it will destroy any embryonic children it has.
1240 */
1241 LIST_INSERT_HEAD(&priv->embryos, priv2, siblings);
1242
1243 so->so_upcallarg = (caddr_t)node;
1244 so->so_upcall = ng_ksocket_incoming;
1245 so->so_rcv.sb_flags |= SB_UPCALL;
1246 so->so_snd.sb_flags |= SB_UPCALL;
1247
1248 /* Fill in the response data and send it or return it to the caller */
1249 resp_data = (struct ng_ksocket_accept *)resp->data;
1250 resp_data->nodeid = NG_NODE_ID(node);
1251 if (sa != NULL)
1252 bcopy(sa, &resp_data->addr, sa->sa_len);
1253 NG_SEND_MSG_ID(error, node, resp, priv->response_addr, NULL);
1254
1255out:
1256 if (sa != NULL)
1257 FREE(sa, M_SONAME);
1258}
1259
1260/*
1261 * Parse out either an integer value or an alias.
1262 */
1263static int
1264ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
1265 const char *s, int family)
1266{
1267 int k, val;
1268 char *eptr;
1269
1270 /* Try aliases */
1271 for (k = 0; aliases[k].name != NULL; k++) {
1272 if (strcmp(s, aliases[k].name) == 0
1273 && aliases[k].family == family)
1274 return aliases[k].value;
1275 }
1276
1277 /* Try parsing as a number */
1278 val = (int)strtoul(s, &eptr, 10);
1279 if (val < 0 || *eptr != '\0')
1280 return (-1);
1281 return (val);
1282}
1283
| 591 if (error != 0)
592 return (error);
593
594 /* XXX call soreserve() ? */
595
596 }
597
598 /* OK */
599 priv->hook = hook;
600 return(0);
601}
602
603static int
604ng_ksocket_connect(hook_p hook)
605{
606 node_p node = NG_HOOK_NODE(hook);
607 const priv_p priv = NG_NODE_PRIVATE(node);
608 struct socket *const so = priv->so;
609
610 /* Add our hook for incoming data and other events */
611 priv->so->so_upcallarg = (caddr_t)node;
612 priv->so->so_upcall = ng_ksocket_incoming;
613 priv->so->so_rcv.sb_flags |= SB_UPCALL;
614 priv->so->so_snd.sb_flags |= SB_UPCALL;
615 priv->so->so_state |= SS_NBIO;
616 /*
617 * --Original comment--
618 * On a cloned socket we may have already received one or more
619 * upcalls which we couldn't handle without a hook. Handle
620 * those now.
621 * We cannot call the upcall function directly
622 * from here, because until this function has returned our
623 * hook isn't connected.
624 *
625 * ---meta comment for -current ---
626 * XXX This is dubius.
627 * Upcalls between the time that the hook was
628 * first created and now (on another processesor) will
629 * be earlier on the queue than the request to finalise the hook.
630 * By the time the hook is finalised,
631 * The queued upcalls will have happenned and the code
632 * will have discarded them because of a lack of a hook.
633 * (socket not open).
634 *
635 * This is a bad byproduct of the complicated way in which hooks
636 * are now created (3 daisy chained async events).
637 *
638 * Since we are a netgraph operation
639 * We know that we hold a lock on this node. This forces the
640 * request we make below to be queued rather than implemented
641 * immediatly which will cause the upcall function to be called a bit
642 * later.
643 * However, as we will run any waiting queued operations immediatly
644 * after doing this one, if we have not finalised the other end
645 * of the hook, those queued operations will fail.
646 */
647 if (priv->flags & KSF_CLONED) {
648 ng_send_fn(node, NULL, &ng_ksocket_incoming2, so, M_NOWAIT);
649 }
650
651 return (0);
652}
653
654/*
655 * Receive a control message
656 */
657static int
658ng_ksocket_rcvmsg(node_p node, item_p item, hook_p lasthook)
659{
660 struct thread *td = curthread ? curthread : thread0; /* XXX broken */
661 const priv_p priv = NG_NODE_PRIVATE(node);
662 struct socket *const so = priv->so;
663 struct ng_mesg *resp = NULL;
664 int error = 0;
665 struct ng_mesg *msg;
666 ng_ID_t raddr;
667
668 NGI_GET_MSG(item, msg);
669 switch (msg->header.typecookie) {
670 case NGM_KSOCKET_COOKIE:
671 switch (msg->header.cmd) {
672 case NGM_KSOCKET_BIND:
673 {
674 struct sockaddr *const sa
675 = (struct sockaddr *)msg->data;
676
677 /* Sanity check */
678 if (msg->header.arglen < SADATA_OFFSET
679 || msg->header.arglen < sa->sa_len)
680 ERROUT(EINVAL);
681 if (so == NULL)
682 ERROUT(ENXIO);
683
684 /* Bind */
685 error = sobind(so, sa, td);
686 break;
687 }
688 case NGM_KSOCKET_LISTEN:
689 {
690 /* Sanity check */
691 if (msg->header.arglen != sizeof(int32_t))
692 ERROUT(EINVAL);
693 if (so == NULL)
694 ERROUT(ENXIO);
695
696 /* Listen */
697 error = solisten(so, *((int32_t *)msg->data), td);
698 break;
699 }
700
701 case NGM_KSOCKET_ACCEPT:
702 {
703 /* Sanity check */
704 if (msg->header.arglen != 0)
705 ERROUT(EINVAL);
706 if (so == NULL)
707 ERROUT(ENXIO);
708
709 /* Make sure the socket is capable of accepting */
710 if (!(so->so_options & SO_ACCEPTCONN))
711 ERROUT(EINVAL);
712 if (priv->flags & KSF_ACCEPTING)
713 ERROUT(EALREADY);
714
715 error = ng_ksocket_check_accept(priv);
716 if (error != 0 && error != EWOULDBLOCK)
717 ERROUT(error);
718
719 /*
720 * If a connection is already complete, take it.
721 * Otherwise let the upcall function deal with
722 * the connection when it comes in.
723 */
724 priv->response_token = msg->header.token;
725 raddr = priv->response_addr;
726 if (error == 0) {
727 ng_ksocket_finish_accept(priv);
728 } else
729 priv->flags |= KSF_ACCEPTING;
730 break;
731 }
732
733 case NGM_KSOCKET_CONNECT:
734 {
735 struct sockaddr *const sa
736 = (struct sockaddr *)msg->data;
737
738 /* Sanity check */
739 if (msg->header.arglen < SADATA_OFFSET
740 || msg->header.arglen < sa->sa_len)
741 ERROUT(EINVAL);
742 if (so == NULL)
743 ERROUT(ENXIO);
744
745 /* Do connect */
746 if ((so->so_state & SS_ISCONNECTING) != 0)
747 ERROUT(EALREADY);
748 if ((error = soconnect(so, sa, td)) != 0) {
749 so->so_state &= ~SS_ISCONNECTING;
750 ERROUT(error);
751 }
752 if ((so->so_state & SS_ISCONNECTING) != 0)
753 /* We will notify the sender when we connect */
754 priv->response_token = msg->header.token;
755 raddr = priv->response_addr;
756 priv->flags |= KSF_CONNECTING;
757 ERROUT(EINPROGRESS);
758 break;
759 }
760
761 case NGM_KSOCKET_GETNAME:
762 case NGM_KSOCKET_GETPEERNAME:
763 {
764 int (*func)(struct socket *so, struct sockaddr **nam);
765 struct sockaddr *sa = NULL;
766 int len;
767
768 /* Sanity check */
769 if (msg->header.arglen != 0)
770 ERROUT(EINVAL);
771 if (so == NULL)
772 ERROUT(ENXIO);
773
774 /* Get function */
775 if (msg->header.cmd == NGM_KSOCKET_GETPEERNAME) {
776 if ((so->so_state
777 & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0)
778 ERROUT(ENOTCONN);
779 func = so->so_proto->pr_usrreqs->pru_peeraddr;
780 } else
781 func = so->so_proto->pr_usrreqs->pru_sockaddr;
782
783 /* Get local or peer address */
784 if ((error = (*func)(so, &sa)) != 0)
785 goto bail;
786 len = (sa == NULL) ? 0 : sa->sa_len;
787
788 /* Send it back in a response */
789 NG_MKRESPONSE(resp, msg, len, M_NOWAIT);
790 if (resp == NULL) {
791 error = ENOMEM;
792 goto bail;
793 }
794 bcopy(sa, resp->data, len);
795
796 bail:
797 /* Cleanup */
798 if (sa != NULL)
799 FREE(sa, M_SONAME);
800 break;
801 }
802
803 case NGM_KSOCKET_GETOPT:
804 {
805 struct ng_ksocket_sockopt *ksopt =
806 (struct ng_ksocket_sockopt *)msg->data;
807 struct sockopt sopt;
808
809 /* Sanity check */
810 if (msg->header.arglen != sizeof(*ksopt))
811 ERROUT(EINVAL);
812 if (so == NULL)
813 ERROUT(ENXIO);
814
815 /* Get response with room for option value */
816 NG_MKRESPONSE(resp, msg, sizeof(*ksopt)
817 + NG_KSOCKET_MAX_OPTLEN, M_NOWAIT);
818 if (resp == NULL)
819 ERROUT(ENOMEM);
820
821 /* Get socket option, and put value in the response */
822 sopt.sopt_dir = SOPT_GET;
823 sopt.sopt_level = ksopt->level;
824 sopt.sopt_name = ksopt->name;
825 sopt.sopt_td = NULL;
826 sopt.sopt_valsize = NG_KSOCKET_MAX_OPTLEN;
827 ksopt = (struct ng_ksocket_sockopt *)resp->data;
828 sopt.sopt_val = ksopt->value;
829 if ((error = sogetopt(so, &sopt)) != 0) {
830 NG_FREE_MSG(resp);
831 break;
832 }
833
834 /* Set actual value length */
835 resp->header.arglen = sizeof(*ksopt)
836 + sopt.sopt_valsize;
837 break;
838 }
839
840 case NGM_KSOCKET_SETOPT:
841 {
842 struct ng_ksocket_sockopt *const ksopt =
843 (struct ng_ksocket_sockopt *)msg->data;
844 const int valsize = msg->header.arglen - sizeof(*ksopt);
845 struct sockopt sopt;
846
847 /* Sanity check */
848 if (valsize < 0)
849 ERROUT(EINVAL);
850 if (so == NULL)
851 ERROUT(ENXIO);
852
853 /* Set socket option */
854 sopt.sopt_dir = SOPT_SET;
855 sopt.sopt_level = ksopt->level;
856 sopt.sopt_name = ksopt->name;
857 sopt.sopt_val = ksopt->value;
858 sopt.sopt_valsize = valsize;
859 sopt.sopt_td = NULL;
860 error = sosetopt(so, &sopt);
861 break;
862 }
863
864 default:
865 error = EINVAL;
866 break;
867 }
868 break;
869 default:
870 error = EINVAL;
871 break;
872 }
873done:
874 NG_RESPOND_MSG(error, node, item, resp);
875 NG_FREE_MSG(msg);
876 return (error);
877}
878
879/*
880 * Receive incoming data on our hook. Send it out the socket.
881 */
882static int
883ng_ksocket_rcvdata(hook_p hook, item_p item)
884{
885 struct thread *td = curthread ? curthread : thread0; /* XXX broken */
886 const node_p node = NG_HOOK_NODE(hook);
887 const priv_p priv = NG_NODE_PRIVATE(node);
888 struct socket *const so = priv->so;
889 struct sockaddr *sa = NULL;
890 meta_p meta;
891 int error;
892 struct mbuf *m;
893
894 /* Extract data and meta information */
895 NGI_GET_M(item, m);
896 NGI_GET_META(item, meta);
897 NG_FREE_ITEM(item);
898
899 /* If any meta info, look for peer socket address */
900 if (meta != NULL) {
901 struct meta_field_header *field;
902
903 /* Look for peer socket address */
904 for (field = &meta->options[0];
905 (caddr_t)field < (caddr_t)meta + meta->used_len;
906 field = (struct meta_field_header *)
907 ((caddr_t)field + field->len)) {
908 if (field->cookie != NGM_KSOCKET_COOKIE
909 || field->type != NG_KSOCKET_META_SOCKADDR)
910 continue;
911 sa = (struct sockaddr *)field->data;
912 break;
913 }
914 }
915
916 /* Send packet */
917 error = (*so->so_proto->pr_usrreqs->pru_sosend)(so, sa, 0, m, 0, 0, td);
918
919 /* Clean up and exit */
920 NG_FREE_META(meta);
921 return (error);
922}
923
924/*
925 * Destroy node
926 */
927static int
928ng_ksocket_shutdown(node_p node)
929{
930 const priv_p priv = NG_NODE_PRIVATE(node);
931 priv_p embryo;
932
933 /* Close our socket (if any) */
934 if (priv->so != NULL) {
935 priv->so->so_upcall = NULL;
936 priv->so->so_rcv.sb_flags &= ~SB_UPCALL;
937 priv->so->so_snd.sb_flags &= ~SB_UPCALL;
938 soclose(priv->so);
939 priv->so = NULL;
940 }
941
942 /* If we are an embryo, take ourselves out of the parent's list */
943 if (priv->flags & KSF_EMBRYONIC) {
944 LIST_REMOVE(priv, siblings);
945 priv->flags &= ~KSF_EMBRYONIC;
946 }
947
948 /* Remove any embryonic children we have */
949 while (!LIST_EMPTY(&priv->embryos)) {
950 embryo = LIST_FIRST(&priv->embryos);
951 ng_rmnode_self(embryo->node);
952 }
953
954 /* Take down netgraph node */
955 bzero(priv, sizeof(*priv));
956 FREE(priv, M_NETGRAPH_KSOCKET);
957 NG_NODE_SET_PRIVATE(node, NULL);
958 NG_NODE_UNREF(node); /* let the node escape */
959 return (0);
960}
961
962/*
963 * Hook disconnection
964 */
965static int
966ng_ksocket_disconnect(hook_p hook)
967{
968 KASSERT(NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0,
969 ("%s: numhooks=%d?", __func__,
970 NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook))));
971 if (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))
972 ng_rmnode_self(NG_HOOK_NODE(hook));
973 return (0);
974}
975
976/************************************************************************
977 HELPER STUFF
978 ************************************************************************/
979/*
980 * You should no-longer "just call" a netgraph node function
981 * from an external asynchronous event.
982 * This is because in doing so you are ignoring the locking on the netgraph
983 * nodes. Instead call your function via
984 * "int ng_send_fn(node_p node, hook_p hook, ng_item_fn *fn,
985 * void *arg1, int arg2);"
986 * this will call the function you chose, but will first do all the
987 * locking rigmarole. Your function MAY only be called at some distant future
988 * time (several millisecs away) so don't give it any arguments
989 * that may be revoked soon (e.g. on your stack).
990 * In this case even the 'so' argument is doubtful.
991 * While the function request is being processed the node
992 * has an extra reference and as such will not disappear until
993 * the request has at least been done, but the 'so' may not be so lucky.
994 * handle this by checking the validity of the node in the target function
995 * before dereferencing the socket pointer.
996 */
997
998static void
999ng_ksocket_incoming(struct socket *so, void *arg, int waitflag)
1000{
1001 const node_p node = arg;
1002
1003 ng_send_fn(node, NULL, &ng_ksocket_incoming2, so, waitflag);
1004}
1005
1006
1007/*
1008 * When incoming data is appended to the socket, we get notified here.
1009 * This is also called whenever a significant event occurs for the socket.
1010 * We know that HOOK is NULL. Because of how we were called we know we have a
1011 * lock on this node an are participating inthe netgraph locking.
1012 * Our original caller may have queued this even some time ago and
1013 * we cannot trust that he even still exists. The node however is being
1014 * held with a reference by the queueing code, at least until we finish,
1015 * even if it has been zapped, so first check it's validiy
1016 * before we trust the socket (which was derived from it).
1017 */
1018static void
1019ng_ksocket_incoming2(node_p node, hook_p hook, void *arg1, int waitflag)
1020{
1021 struct socket *so = arg1;
1022 const priv_p priv = NG_NODE_PRIVATE(node);
1023 struct mbuf *m;
1024 struct ng_mesg *response;
1025 struct uio auio;
1026 int s, flags, error;
1027
1028 s = splnet();
1029
1030 /* Sanity check */
1031 if (NG_NODE_NOT_VALID(node)) {
1032 splx(s);
1033 return;
1034 }
1035 /* so = priv->so; *//* XXX could have derived this like so */
1036 KASSERT(so == priv->so, ("%s: wrong socket", __func__));
1037
1038 /* Check whether a pending connect operation has completed */
1039 if (priv->flags & KSF_CONNECTING) {
1040 if ((error = so->so_error) != 0) {
1041 so->so_error = 0;
1042 so->so_state &= ~SS_ISCONNECTING;
1043 }
1044 if (!(so->so_state & SS_ISCONNECTING)) {
1045 NG_MKMESSAGE(response, NGM_KSOCKET_COOKIE,
1046 NGM_KSOCKET_CONNECT, sizeof(int32_t), waitflag);
1047 if (response != NULL) {
1048 response->header.flags |= NGF_RESP;
1049 response->header.token = priv->response_token;
1050 *(int32_t *)response->data = error;
1051 /*
1052 * send an async "response" message
1053 * to the node that set us up
1054 * (if it still exists)
1055 */
1056 NG_SEND_MSG_ID(error, node, response,
1057 priv->response_addr, NULL);
1058 }
1059 priv->flags &= ~KSF_CONNECTING;
1060 }
1061 }
1062
1063 /* Check whether a pending accept operation has completed */
1064 if (priv->flags & KSF_ACCEPTING) {
1065 error = ng_ksocket_check_accept(priv);
1066 if (error != EWOULDBLOCK)
1067 priv->flags &= ~KSF_ACCEPTING;
1068 if (error == 0)
1069 ng_ksocket_finish_accept(priv);
1070 }
1071
1072 /*
1073 * If we don't have a hook, we must handle data events later. When
1074 * the hook gets created and is connected, this upcall function
1075 * will be called again.
1076 */
1077 if (priv->hook == NULL) {
1078 splx(s);
1079 return;
1080 }
1081
1082 /* Read and forward available mbuf's */
1083 auio.uio_td = NULL;
1084 auio.uio_resid = 1000000000;
1085 flags = MSG_DONTWAIT;
1086 while (1) {
1087 struct sockaddr *sa = NULL;
1088 meta_p meta = NULL;
1089 struct mbuf *n;
1090
1091 /* Try to get next packet from socket */
1092 if ((error = (*so->so_proto->pr_usrreqs->pru_soreceive)
1093 (so, (so->so_state & SS_ISCONNECTED) ? NULL : &sa,
1094 &auio, &m, (struct mbuf **)0, &flags)) != 0)
1095 break;
1096
1097 /* See if we got anything */
1098 if (m == NULL) {
1099 if (sa != NULL)
1100 FREE(sa, M_SONAME);
1101 break;
1102 }
1103
1104 /* Don't trust the various socket layers to get the
1105 packet header and length correct (eg. kern/15175) */
1106 for (n = m, m->m_pkthdr.len = 0; n != NULL; n = n->m_next)
1107 m->m_pkthdr.len += n->m_len;
1108
1109 /* Put peer's socket address (if any) into a meta info blob */
1110 if (sa != NULL) {
1111 struct meta_field_header *mhead;
1112 u_int len;
1113
1114 len = sizeof(*meta) + sizeof(*mhead) + sa->sa_len;
1115 MALLOC(meta, meta_p, len, M_NETGRAPH_META, M_NOWAIT);
1116 if (meta == NULL) {
1117 FREE(sa, M_SONAME);
1118 goto sendit;
1119 }
1120 mhead = &meta->options[0];
1121 bzero(meta, sizeof(*meta));
1122 bzero(mhead, sizeof(*mhead));
1123 meta->allocated_len = len;
1124 meta->used_len = len;
1125 mhead->cookie = NGM_KSOCKET_COOKIE;
1126 mhead->type = NG_KSOCKET_META_SOCKADDR;
1127 mhead->len = sizeof(*mhead) + sa->sa_len;
1128 bcopy(sa, mhead->data, sa->sa_len);
1129 FREE(sa, M_SONAME);
1130 }
1131
1132sendit: /* Forward data with optional peer sockaddr as meta info */
1133 NG_SEND_DATA(error, priv->hook, m, meta);
1134 }
1135
1136 /*
1137 * If the peer has closed the connection, forward a 0-length mbuf
1138 * to indicate end-of-file.
1139 */
1140 if (so->so_state & SS_CANTRCVMORE && !(priv->flags & KSF_EOFSEEN)) {
1141 MGETHDR(m, waitflag, MT_DATA);
1142 if (m != NULL) {
1143 m->m_len = m->m_pkthdr.len = 0;
1144 NG_SEND_DATA_ONLY(error, priv->hook, m);
1145 }
1146 priv->flags |= KSF_EOFSEEN;
1147 }
1148 splx(s);
1149}
1150
1151/*
1152 * Check for a completed incoming connection and return 0 if one is found.
1153 * Otherwise return the appropriate error code.
1154 */
1155static int
1156ng_ksocket_check_accept(priv_p priv)
1157{
1158 struct socket *const head = priv->so;
1159 int error;
1160
1161 if ((error = head->so_error) != 0) {
1162 head->so_error = 0;
1163 return error;
1164 }
1165 if (TAILQ_EMPTY(&head->so_comp)) {
1166 if (head->so_state & SS_CANTRCVMORE)
1167 return ECONNABORTED;
1168 return EWOULDBLOCK;
1169 }
1170 return 0;
1171}
1172
1173/*
1174 * Handle the first completed incoming connection, assumed to be already
1175 * on the socket's so_comp queue.
1176 */
1177static void
1178ng_ksocket_finish_accept(priv_p priv)
1179{
1180 struct socket *const head = priv->so;
1181 struct socket *so;
1182 struct sockaddr *sa = NULL;
1183 struct ng_mesg *resp;
1184 struct ng_ksocket_accept *resp_data;
1185 node_p node;
1186 priv_p priv2;
1187 int len;
1188 int error;
1189
1190 so = TAILQ_FIRST(&head->so_comp);
1191 if (so == NULL) /* Should never happen */
1192 return;
1193 TAILQ_REMOVE(&head->so_comp, so, so_list);
1194 head->so_qlen--;
1195
1196 /* XXX KNOTE(&head->so_rcv.sb_sel.si_note, 0); */
1197
1198 so->so_state &= ~SS_COMP;
1199 so->so_state |= SS_NBIO;
1200 so->so_head = NULL;
1201
1202 soaccept(so, &sa);
1203
1204 len = OFFSETOF(struct ng_ksocket_accept, addr);
1205 if (sa != NULL)
1206 len += sa->sa_len;
1207
1208 NG_MKMESSAGE(resp, NGM_KSOCKET_COOKIE, NGM_KSOCKET_ACCEPT, len,
1209 M_NOWAIT);
1210 if (resp == NULL) {
1211 soclose(so);
1212 goto out;
1213 }
1214 resp->header.flags |= NGF_RESP;
1215 resp->header.token = priv->response_token;
1216
1217 /* Clone a ksocket node to wrap the new socket */
1218 error = ng_make_node_common(&ng_ksocket_typestruct, &node);
1219 if (error) {
1220 FREE(resp, M_NETGRAPH);
1221 soclose(so);
1222 goto out;
1223 }
1224
1225 if (ng_ksocket_constructor(node) != 0) {
1226 NG_NODE_UNREF(node);
1227 FREE(resp, M_NETGRAPH);
1228 soclose(so);
1229 goto out;
1230 }
1231
1232 priv2 = NG_NODE_PRIVATE(node);
1233 priv2->so = so;
1234 priv2->flags |= KSF_CLONED | KSF_EMBRYONIC;
1235
1236 /*
1237 * Insert the cloned node into a list of embryonic children
1238 * on the parent node. When a hook is created on the cloned
1239 * node it will be removed from this list. When the parent
1240 * is destroyed it will destroy any embryonic children it has.
1241 */
1242 LIST_INSERT_HEAD(&priv->embryos, priv2, siblings);
1243
1244 so->so_upcallarg = (caddr_t)node;
1245 so->so_upcall = ng_ksocket_incoming;
1246 so->so_rcv.sb_flags |= SB_UPCALL;
1247 so->so_snd.sb_flags |= SB_UPCALL;
1248
1249 /* Fill in the response data and send it or return it to the caller */
1250 resp_data = (struct ng_ksocket_accept *)resp->data;
1251 resp_data->nodeid = NG_NODE_ID(node);
1252 if (sa != NULL)
1253 bcopy(sa, &resp_data->addr, sa->sa_len);
1254 NG_SEND_MSG_ID(error, node, resp, priv->response_addr, NULL);
1255
1256out:
1257 if (sa != NULL)
1258 FREE(sa, M_SONAME);
1259}
1260
1261/*
1262 * Parse out either an integer value or an alias.
1263 */
1264static int
1265ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
1266 const char *s, int family)
1267{
1268 int k, val;
1269 char *eptr;
1270
1271 /* Try aliases */
1272 for (k = 0; aliases[k].name != NULL; k++) {
1273 if (strcmp(s, aliases[k].name) == 0
1274 && aliases[k].family == family)
1275 return aliases[k].value;
1276 }
1277
1278 /* Try parsing as a number */
1279 val = (int)strtoul(s, &eptr, 10);
1280 if (val < 0 || *eptr != '\0')
1281 return (-1);
1282 return (val);
1283}
1284
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