1 2 /* 3 * ng_ksocket.c 4 * 5 * Copyright (c) 1996-1999 Whistle Communications, Inc. 6 * All rights reserved. 7 * 8 * Subject to the following obligations and disclaimer of warranty, use and 9 * redistribution of this software, in source or object code forms, with or 10 * without modifications are expressly permitted by Whistle Communications; 11 * provided, however, that: 12 * 1. Any and all reproductions of the source or object code must include the 13 * copyright notice above and the following disclaimer of warranties; and 14 * 2. No rights are granted, in any manner or form, to use Whistle 15 * Communications, Inc. trademarks, including the mark "WHISTLE 16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 17 * such appears in the above copyright notice or in the software. 18 * 19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 35 * OF SUCH DAMAGE. 36 * 37 * Author: Archie Cobbs <archie@freebsd.org> 38 * 39 * $FreeBSD$ 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 71 MALLOC_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 */ 80 struct ng_ksocket_private { 81 hook_p hook; 82 struct socket *so; 83 }; 84 typedef struct ng_ksocket_private *priv_p; 85 86 /* Netgraph node methods */ 87 static ng_constructor_t ng_ksocket_constructor; 88 static ng_rcvmsg_t ng_ksocket_rcvmsg; 89 static ng_shutdown_t ng_ksocket_shutdown; 90 static ng_newhook_t ng_ksocket_newhook; 91 static ng_rcvdata_t ng_ksocket_rcvdata; 92 static ng_disconnect_t ng_ksocket_disconnect; 93 94 /* Alias structure */ 95 struct ng_ksocket_alias { 96 const char *name; 97 const int value; 98 const int family; 99 }; 100 101 /* Protocol family aliases */ 102 static const struct ng_ksocket_alias ng_ksocket_families[] = { 103 { "local", PF_LOCAL }, 104 { "inet", PF_INET }, 105 { "inet6", PF_INET6 }, 106 { "atalk", PF_APPLETALK }, 107 { "ipx", PF_IPX }, 108 { "atm", PF_ATM }, 109 { NULL, -1 }, 110 }; 111 112 /* Socket type aliases */ 113 static const struct ng_ksocket_alias ng_ksocket_types[] = { 114 { "stream", SOCK_STREAM }, 115 { "dgram", SOCK_DGRAM }, 116 { "raw", SOCK_RAW }, 117 { "rdm", SOCK_RDM }, 118 { "seqpacket", SOCK_SEQPACKET }, 119 { NULL, -1 }, 120 }; 121 122 /* Protocol aliases */ 123 static const struct ng_ksocket_alias ng_ksocket_protos[] = { 124 { "ip", IPPROTO_IP, PF_INET }, 125 { "raw", IPPROTO_IP, PF_INET }, 126 { "icmp", IPPROTO_ICMP, PF_INET }, 127 { "igmp", IPPROTO_IGMP, PF_INET }, 128 { "tcp", IPPROTO_TCP, PF_INET }, 129 { "udp", IPPROTO_UDP, PF_INET }, 130 { "gre", IPPROTO_GRE, PF_INET }, 131 { "esp", IPPROTO_ESP, PF_INET }, 132 { "ah", IPPROTO_AH, PF_INET }, 133 { "swipe", IPPROTO_SWIPE, PF_INET }, 134 { "encap", IPPROTO_ENCAP, PF_INET }, 135 { "divert", IPPROTO_DIVERT, PF_INET }, 136 { "ddp", ATPROTO_DDP, PF_APPLETALK }, 137 { "aarp", ATPROTO_AARP, PF_APPLETALK }, 138 { NULL, -1 }, 139 }; 140 141 /* Helper functions */ 142 static void ng_ksocket_incoming(struct socket *so, void *arg, int waitflag); 143 static int ng_ksocket_parse(const struct ng_ksocket_alias *aliases, 144 const char *s, int family); 145 146 /************************************************************************ 147 STRUCT SOCKADDR PARSE TYPE 148 ************************************************************************/ 149 150 /* Get the length of the data portion of a generic struct sockaddr */ 151 static int 152 ng_parse_generic_sockdata_getLength(const struct ng_parse_type *type, 153 const u_char *start, const u_char *buf) 154 { 155 const struct sockaddr *sa; 156 157 sa = (const struct sockaddr *)(buf - SADATA_OFFSET); 158 return (sa->sa_len < SADATA_OFFSET) ? 0 : sa->sa_len - SADATA_OFFSET; 159 } 160 161 /* Type for the variable length data portion of a generic struct sockaddr */ 162 static const struct ng_parse_type ng_ksocket_generic_sockdata_type = { 163 &ng_parse_bytearray_type, 164 &ng_parse_generic_sockdata_getLength 165 }; 166 167 /* Type for a generic struct sockaddr */ 168 static const struct ng_parse_struct_info ng_parse_generic_sockaddr_type_info = { 169 { 170 { "len", &ng_parse_uint8_type }, 171 { "family", &ng_parse_uint8_type }, 172 { "data", &ng_ksocket_generic_sockdata_type }, 173 { NULL } 174 } 175 }; 176 static const struct ng_parse_type ng_ksocket_generic_sockaddr_type = { 177 &ng_parse_struct_type, 178 &ng_parse_generic_sockaddr_type_info 179 }; 180 181 /* Convert a struct sockaddr from ASCII to binary. If its a protocol 182 family that we specially handle, do that, otherwise defer to the 183 generic parse type ng_ksocket_generic_sockaddr_type. */ 184 static int 185 ng_ksocket_sockaddr_parse(const struct ng_parse_type *type, 186 const char *s, int *off, const u_char *const start, 187 u_char *const buf, int *buflen) 188 { 189 struct sockaddr *const sa = (struct sockaddr *)buf; 190 enum ng_parse_token tok; 191 char fambuf[32]; 192 int family, len; 193 char *t; 194 195 /* If next token is a left curly brace, use generic parse type */ 196 if ((tok = ng_parse_get_token(s, off, &len)) == T_LBRACE) { 197 return (*ng_ksocket_generic_sockaddr_type.supertype->parse) 198 (&ng_ksocket_generic_sockaddr_type, 199 s, off, start, buf, buflen); 200 } 201 202 /* Get socket address family followed by a slash */ 203 while (isspace(s[*off])) 204 (*off)++; 205 if ((t = index(s + *off, '/')) == NULL) 206 return (EINVAL); 207 if ((len = t - (s + *off)) > sizeof(fambuf) - 1) 208 return (EINVAL); 209 strncpy(fambuf, s + *off, len); 210 fambuf[len] = '\0'; 211 *off += len + 1; 212 if ((family = ng_ksocket_parse(ng_ksocket_families, fambuf, 0)) == -1) 213 return (EINVAL); 214 215 /* Set family */ 216 if (*buflen < SADATA_OFFSET) 217 return (ERANGE); 218 sa->sa_family = family; 219 220 /* Set family-specific data and length */ 221 switch (sa->sa_family) { 222 case PF_LOCAL: /* Get pathname */ 223 { 224 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path); 225 struct sockaddr_un *const sun = (struct sockaddr_un *)sa; 226 int toklen, pathlen; 227 char *path; 228 229 if ((path = ng_get_string_token(s, off, &toklen, NULL)) == NULL) 230 return (EINVAL); 231 pathlen = strlen(path); 232 if (pathlen > SOCK_MAXADDRLEN) { 233 FREE(path, M_NETGRAPH_KSOCKET); 234 return (E2BIG); 235 } 236 if (*buflen < pathoff + pathlen) { 237 FREE(path, M_NETGRAPH_KSOCKET); 238 return (ERANGE); 239 } 240 *off += toklen; 241 bcopy(path, sun->sun_path, pathlen); 242 sun->sun_len = pathoff + pathlen; 243 FREE(path, M_NETGRAPH_KSOCKET); 244 break; 245 } 246 247 case PF_INET: /* Get an IP address with optional port */ 248 { 249 struct sockaddr_in *const sin = (struct sockaddr_in *)sa; 250 int i; 251 252 /* Parse this: <ipaddress>[:port] */ 253 for (i = 0; i < 4; i++) { 254 u_long val; 255 char *eptr; 256 257 val = strtoul(s + *off, &eptr, 10); 258 if (val > 0xff || eptr == s + *off) 259 return (EINVAL); 260 *off += (eptr - (s + *off)); 261 ((u_char *)&sin->sin_addr)[i] = (u_char)val; 262 if (i < 3) { 263 if (s[*off] != '.') 264 return (EINVAL); 265 (*off)++; 266 } else if (s[*off] == ':') { 267 (*off)++; 268 val = strtoul(s + *off, &eptr, 10); 269 if (val > 0xffff || eptr == s + *off) 270 return (EINVAL); 271 *off += (eptr - (s + *off)); 272 sin->sin_port = htons(val); 273 } else 274 sin->sin_port = 0; 275 } 276 bzero(&sin->sin_zero, sizeof(sin->sin_zero)); 277 sin->sin_len = sizeof(*sin); 278 break; 279 } 280 281 #if 0 282 case PF_APPLETALK: /* XXX implement these someday */ 283 case PF_INET6: 284 case PF_IPX: 285 #endif 286 287 default: 288 return (EINVAL); 289 } 290 291 /* Done */ 292 *buflen = sa->sa_len; 293 return (0); 294 } 295 296 /* Convert a struct sockaddr from binary to ASCII */ 297 static int 298 ng_ksocket_sockaddr_unparse(const struct ng_parse_type *type, 299 const u_char *data, int *off, char *cbuf, int cbuflen) 300 { 301 const struct sockaddr *sa = (const struct sockaddr *)(data + *off); 302 int slen = 0; 303 304 /* Output socket address, either in special or generic format */ 305 switch (sa->sa_family) { 306 case PF_LOCAL: 307 { 308 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path); 309 const struct sockaddr_un *sun = (const struct sockaddr_un *)sa; 310 const int pathlen = sun->sun_len - pathoff; 311 char pathbuf[SOCK_MAXADDRLEN + 1]; 312 char *pathtoken; 313 314 bcopy(sun->sun_path, pathbuf, pathlen); 315 if ((pathtoken = ng_encode_string(pathbuf, pathlen)) == NULL) 316 return (ENOMEM); 317 slen += snprintf(cbuf, cbuflen, "local/%s", pathtoken); 318 FREE(pathtoken, M_NETGRAPH_KSOCKET); 319 if (slen >= cbuflen) 320 return (ERANGE); 321 *off += sun->sun_len; 322 return (0); 323 } 324 325 case PF_INET: 326 { 327 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa; 328 329 slen += snprintf(cbuf, cbuflen, "inet/%d.%d.%d.%d", 330 ((const u_char *)&sin->sin_addr)[0], 331 ((const u_char *)&sin->sin_addr)[1], 332 ((const u_char *)&sin->sin_addr)[2], 333 ((const u_char *)&sin->sin_addr)[3]); 334 if (sin->sin_port != 0) { 335 slen += snprintf(cbuf + strlen(cbuf), 336 cbuflen - strlen(cbuf), ":%d", 337 (u_int)ntohs(sin->sin_port)); 338 } 339 if (slen >= cbuflen) 340 return (ERANGE); 341 *off += sizeof(*sin); 342 return(0); 343 } 344 345 #if 0 346 case PF_APPLETALK: /* XXX implement these someday */ 347 case PF_INET6: 348 case PF_IPX: 349 #endif 350 351 default: 352 return (*ng_ksocket_generic_sockaddr_type.supertype->unparse) 353 (&ng_ksocket_generic_sockaddr_type, 354 data, off, cbuf, cbuflen); 355 } 356 } 357 358 /* Parse type for struct sockaddr */ 359 static const struct ng_parse_type ng_ksocket_sockaddr_type = { 360 NULL, 361 NULL, 362 NULL, 363 &ng_ksocket_sockaddr_parse, 364 &ng_ksocket_sockaddr_unparse, 365 NULL /* no such thing as a default struct sockaddr */ 366 }; 367 368 /************************************************************************ 369 STRUCT NG_KSOCKET_SOCKOPT PARSE TYPE 370 ************************************************************************/ 371 372 /* Get length of the struct ng_ksocket_sockopt value field, which is the 373 just the excess of the message argument portion over the length of 374 the struct ng_ksocket_sockopt. */ 375 static int 376 ng_parse_sockoptval_getLength(const struct ng_parse_type *type, 377 const u_char *start, const u_char *buf) 378 { 379 static const int offset = OFFSETOF(struct ng_ksocket_sockopt, value); 380 const struct ng_ksocket_sockopt *sopt; 381 const struct ng_mesg *msg; 382 383 sopt = (const struct ng_ksocket_sockopt *)(buf - offset); 384 msg = (const struct ng_mesg *)((const u_char *)sopt - sizeof(*msg)); 385 return msg->header.arglen - sizeof(*sopt); 386 } 387 388 /* Parse type for the option value part of a struct ng_ksocket_sockopt 389 XXX Eventually, we should handle the different socket options specially. 390 XXX This would avoid byte order problems, eg an integer value of 1 is 391 XXX going to be "[1]" for little endian or "[3=1]" for big endian. */ 392 static const struct ng_parse_type ng_ksocket_sockoptval_type = { 393 &ng_parse_bytearray_type, 394 &ng_parse_sockoptval_getLength 395 }; 396 397 /* Parse type for struct ng_ksocket_sockopt */ 398 static const struct ng_parse_struct_info ng_ksocket_sockopt_type_info 399 = NG_KSOCKET_SOCKOPT_INFO(&ng_ksocket_sockoptval_type); 400 static const struct ng_parse_type ng_ksocket_sockopt_type = { 401 &ng_parse_struct_type, 402 &ng_ksocket_sockopt_type_info, 403 }; 404 405 /* List of commands and how to convert arguments to/from ASCII */ 406 static const struct ng_cmdlist ng_ksocket_cmds[] = { 407 { 408 NGM_KSOCKET_COOKIE, 409 NGM_KSOCKET_BIND, 410 "bind", 411 &ng_ksocket_sockaddr_type, 412 NULL 413 }, 414 { 415 NGM_KSOCKET_COOKIE, 416 NGM_KSOCKET_LISTEN, 417 "listen", 418 &ng_parse_int32_type, 419 NULL 420 }, 421 { 422 NGM_KSOCKET_COOKIE, 423 NGM_KSOCKET_ACCEPT, 424 "accept", 425 NULL, 426 &ng_ksocket_sockaddr_type 427 }, 428 { 429 NGM_KSOCKET_COOKIE, 430 NGM_KSOCKET_CONNECT, 431 "connect", 432 &ng_ksocket_sockaddr_type, 433 NULL 434 }, 435 { 436 NGM_KSOCKET_COOKIE, 437 NGM_KSOCKET_GETNAME, 438 "getname", 439 NULL, 440 &ng_ksocket_sockaddr_type 441 }, 442 { 443 NGM_KSOCKET_COOKIE, 444 NGM_KSOCKET_GETPEERNAME, 445 "getpeername", 446 NULL, 447 &ng_ksocket_sockaddr_type 448 }, 449 { 450 NGM_KSOCKET_COOKIE, 451 NGM_KSOCKET_SETOPT, 452 "setopt", 453 &ng_ksocket_sockopt_type, 454 NULL 455 }, 456 { 457 NGM_KSOCKET_COOKIE, 458 NGM_KSOCKET_GETOPT, 459 "getopt", 460 &ng_ksocket_sockopt_type, 461 &ng_ksocket_sockopt_type 462 }, 463 { 0 } 464 }; 465 466 /* Node type descriptor */ 467 static struct ng_type ng_ksocket_typestruct = { 468 NG_ABI_VERSION, 469 NG_KSOCKET_NODE_TYPE, 470 NULL, 471 ng_ksocket_constructor, 472 ng_ksocket_rcvmsg, 473 ng_ksocket_shutdown, 474 ng_ksocket_newhook, 475 NULL, 476 NULL, 477 ng_ksocket_rcvdata, 478 ng_ksocket_disconnect, 479 ng_ksocket_cmds 480 }; 481 NETGRAPH_INIT(ksocket, &ng_ksocket_typestruct); 482 483 #define ERROUT(x) do { error = (x); goto done; } while (0) 484 485 /************************************************************************ 486 NETGRAPH NODE STUFF 487 ************************************************************************/ 488 489 /* 490 * Node type constructor 491 */ 492 static int 493 ng_ksocket_constructor(node_p node) 494 { 495 priv_p priv; 496 497 /* Allocate private structure */ 498 MALLOC(priv, priv_p, sizeof(*priv), 499 M_NETGRAPH_KSOCKET, M_NOWAIT | M_ZERO); 500 if (priv == NULL) 501 return (ENOMEM); 502 503 NG_NODE_SET_PRIVATE(node, priv); 504 505 /* Done */ 506 return (0); 507 } 508 509 /* 510 * Give our OK for a hook to be added. The hook name is of the 511 * form "<family>/<type>/<proto>" where the three components may 512 * be decimal numbers or else aliases from the above lists. 513 * 514 * Connecting a hook amounts to opening the socket. Disconnecting 515 * the hook closes the socket and destroys the node as well. 516 */ 517 static int 518 ng_ksocket_newhook(node_p node, hook_p hook, const char *name0) 519 { 520 struct proc *p = curproc ? curproc : &proc0; /* XXX broken */ 521 const priv_p priv = NG_NODE_PRIVATE(node); 522 char *s1, *s2, name[NG_HOOKLEN+1]; 523 int family, type, protocol, error; 524 525 /* Check if we're already connected */ 526 if (priv->hook != NULL) 527 return (EISCONN); 528 529 /* Extract family, type, and protocol from hook name */ 530 snprintf(name, sizeof(name), "%s", name0); 531 s1 = name; 532 if ((s2 = index(s1, '/')) == NULL) 533 return (EINVAL); 534 *s2++ = '\0'; 535 if ((family = ng_ksocket_parse(ng_ksocket_families, s1, 0)) == -1) 536 return (EINVAL); 537 s1 = s2; 538 if ((s2 = index(s1, '/')) == NULL) 539 return (EINVAL); 540 *s2++ = '\0'; 541 if ((type = ng_ksocket_parse(ng_ksocket_types, s1, 0)) == -1) 542 return (EINVAL); 543 s1 = s2; 544 if ((protocol = ng_ksocket_parse(ng_ksocket_protos, s1, family)) == -1) 545 return (EINVAL); 546 547 /* Create the socket */ 548 if ((error = socreate(family, &priv->so, type, protocol, p)) != 0) 549 return (error); 550 551 /* XXX call soreserve() ? */ 552 553 /* Add our hook for incoming data */ 554 priv->so->so_upcallarg = (caddr_t)node; 555 priv->so->so_upcall = ng_ksocket_incoming; 556 priv->so->so_rcv.sb_flags |= SB_UPCALL; 557 558 /* OK */ 559 priv->hook = hook; 560 return (0); 561 } 562 563 /* 564 * Receive a control message 565 */ 566 static int 567 ng_ksocket_rcvmsg(node_p node, item_p item, hook_p lasthook) 568 { 569 struct proc *p = curproc ? curproc : &proc0; /* XXX broken */ 570 const priv_p priv = NG_NODE_PRIVATE(node); 571 struct socket *const so = priv->so; 572 struct ng_mesg *resp = NULL; 573 int error = 0; 574 struct ng_mesg *msg; 575 576 NGI_GET_MSG(item, msg); 577 switch (msg->header.typecookie) { 578 case NGM_KSOCKET_COOKIE: 579 switch (msg->header.cmd) { 580 case NGM_KSOCKET_BIND: 581 { 582 struct sockaddr *const sa 583 = (struct sockaddr *)msg->data; 584 585 /* Sanity check */ 586 if (msg->header.arglen < SADATA_OFFSET 587 || msg->header.arglen < sa->sa_len) 588 ERROUT(EINVAL); 589 if (so == NULL) 590 ERROUT(ENXIO); 591 592 /* Bind */ 593 error = sobind(so, sa, p); 594 break; 595 } 596 case NGM_KSOCKET_LISTEN: 597 { 598 /* Sanity check */ 599 if (msg->header.arglen != sizeof(int)) 600 ERROUT(EINVAL); 601 if (so == NULL) 602 ERROUT(ENXIO); 603 604 /* Listen */ 605 if ((error = solisten(so, *((int *)msg->data), p)) != 0) 606 break; 607 608 /* Notify sender when we get a connection attempt */ 609 /* XXX implement me */ 610 error = ENODEV; 611 break; 612 } 613 614 case NGM_KSOCKET_ACCEPT: 615 { 616 /* Sanity check */ 617 if (msg->header.arglen != 0) 618 ERROUT(EINVAL); 619 if (so == NULL) 620 ERROUT(ENXIO); 621 622 /* Accept on the socket in a non-blocking way */ 623 /* Create a new ksocket node for the new connection */ 624 /* Return a response with the peer's sockaddr and 625 the absolute name of the newly created node */ 626 627 /* XXX implement me */ 628 629 error = ENODEV; 630 break; 631 } 632 633 case NGM_KSOCKET_CONNECT: 634 { 635 struct sockaddr *const sa 636 = (struct sockaddr *)msg->data; 637 638 /* Sanity check */ 639 if (msg->header.arglen < SADATA_OFFSET 640 || msg->header.arglen < sa->sa_len) 641 ERROUT(EINVAL); 642 if (so == NULL) 643 ERROUT(ENXIO); 644 645 /* Do connect */ 646 if ((so->so_state & SS_ISCONNECTING) != 0) 647 ERROUT(EALREADY); 648 if ((error = soconnect(so, sa, p)) != 0) { 649 so->so_state &= ~SS_ISCONNECTING; 650 ERROUT(error); 651 } 652 if ((so->so_state & SS_ISCONNECTING) != 0) 653 /* Notify sender when we connect */ 654 /* XXX implement me */ 655 ERROUT(EINPROGRESS); 656 break; 657 } 658 659 case NGM_KSOCKET_GETNAME: 660 case NGM_KSOCKET_GETPEERNAME: 661 { 662 int (*func)(struct socket *so, struct sockaddr **nam); 663 struct sockaddr *sa = NULL; 664 int len; 665 666 /* Sanity check */ 667 if (msg->header.arglen != 0) 668 ERROUT(EINVAL); 669 if (so == NULL) 670 ERROUT(ENXIO); 671 672 /* Get function */ 673 if (msg->header.cmd == NGM_KSOCKET_GETPEERNAME) { 674 if ((so->so_state 675 & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) 676 ERROUT(ENOTCONN); 677 func = so->so_proto->pr_usrreqs->pru_peeraddr; 678 } else 679 func = so->so_proto->pr_usrreqs->pru_sockaddr; 680 681 /* Get local or peer address */ 682 if ((error = (*func)(so, &sa)) != 0) 683 goto bail; 684 len = (sa == NULL) ? 0 : sa->sa_len; 685 686 /* Send it back in a response */ 687 NG_MKRESPONSE(resp, msg, len, M_NOWAIT); 688 if (resp == NULL) { 689 error = ENOMEM; 690 goto bail; 691 } 692 bcopy(sa, resp->data, len); 693 694 bail: 695 /* Cleanup */ 696 if (sa != NULL) 697 FREE(sa, M_SONAME); 698 break; 699 } 700 701 case NGM_KSOCKET_GETOPT: 702 { 703 struct ng_ksocket_sockopt *ksopt = 704 (struct ng_ksocket_sockopt *)msg->data; 705 struct sockopt sopt; 706 707 /* Sanity check */ 708 if (msg->header.arglen != sizeof(*ksopt)) 709 ERROUT(EINVAL); 710 if (so == NULL) 711 ERROUT(ENXIO); 712 713 /* Get response with room for option value */ 714 NG_MKRESPONSE(resp, msg, sizeof(*ksopt) 715 + NG_KSOCKET_MAX_OPTLEN, M_NOWAIT); 716 if (resp == NULL) 717 ERROUT(ENOMEM); 718 719 /* Get socket option, and put value in the response */ 720 sopt.sopt_dir = SOPT_GET; 721 sopt.sopt_level = ksopt->level; 722 sopt.sopt_name = ksopt->name; 723 sopt.sopt_p = p; 724 sopt.sopt_valsize = NG_KSOCKET_MAX_OPTLEN; 725 ksopt = (struct ng_ksocket_sockopt *)resp->data; 726 sopt.sopt_val = ksopt->value; 727 if ((error = sogetopt(so, &sopt)) != 0) { 728 NG_FREE_MSG(resp); 729 break; 730 } 731 732 /* Set actual value length */ 733 resp->header.arglen = sizeof(*ksopt) 734 + sopt.sopt_valsize; 735 break; 736 } 737 738 case NGM_KSOCKET_SETOPT: 739 { 740 struct ng_ksocket_sockopt *const ksopt = 741 (struct ng_ksocket_sockopt *)msg->data; 742 const int valsize = msg->header.arglen - sizeof(*ksopt); 743 struct sockopt sopt; 744 745 /* Sanity check */ 746 if (valsize < 0) 747 ERROUT(EINVAL); 748 if (so == NULL) 749 ERROUT(ENXIO); 750 751 /* Set socket option */ 752 sopt.sopt_dir = SOPT_SET; 753 sopt.sopt_level = ksopt->level; 754 sopt.sopt_name = ksopt->name; 755 sopt.sopt_val = ksopt->value; 756 sopt.sopt_valsize = valsize; 757 sopt.sopt_p = p; 758 error = sosetopt(so, &sopt); 759 break; 760 } 761 762 default: 763 error = EINVAL; 764 break; 765 } 766 break; 767 default: 768 error = EINVAL; 769 break; 770 } 771 done: 772 NG_RESPOND_MSG(error, node, item, resp); 773 NG_FREE_MSG(msg); 774 return (error); 775 } 776 777 /* 778 * Receive incoming data on our hook. Send it out the socket. 779 */ 780 static int 781 ng_ksocket_rcvdata(hook_p hook, item_p item) 782 { 783 struct proc *p = curproc ? curproc : &proc0; /* XXX broken */ 784 const node_p node = NG_HOOK_NODE(hook); 785 const priv_p priv = NG_NODE_PRIVATE(node); 786 struct socket *const so = priv->so; 787 int error; 788 struct mbuf *m; 789 790 NGI_GET_M(item, m); 791 NG_FREE_ITEM(item); 792 error = (*so->so_proto->pr_usrreqs->pru_sosend)(so, 0, 0, m, 0, 0, p); 793 return (error); 794 } 795 796 /* 797 * Destroy node 798 */ 799 static int 800 ng_ksocket_shutdown(node_p node) 801 { 802 const priv_p priv = NG_NODE_PRIVATE(node); 803 804 /* Close our socket (if any) */ 805 if (priv->so != NULL) { 806 807 priv->so->so_upcall = NULL; 808 priv->so->so_rcv.sb_flags &= ~SB_UPCALL; 809 soclose(priv->so); 810 priv->so = NULL; 811 } 812 813 /* Take down netgraph node */ 814 bzero(priv, sizeof(*priv)); 815 FREE(priv, M_NETGRAPH_KSOCKET); 816 NG_NODE_SET_PRIVATE(node, NULL); 817 NG_NODE_UNREF(node); /* let the node escape */ 818 return (0); 819 } 820 821 /* 822 * Hook disconnection 823 */ 824 static int 825 ng_ksocket_disconnect(hook_p hook) 826 { 827 KASSERT(NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0, 828 ("%s: numhooks=%d?", __FUNCTION__, 829 NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)))); 830 if (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))) 831 ng_rmnode_self(NG_HOOK_NODE(hook)); 832 return (0); 833 } 834 835 /************************************************************************ 836 HELPER STUFF 837 ************************************************************************/ 838 839 /* 840 * When incoming data is appended to the socket, we get notified here. 841 */ 842 static void 843 ng_ksocket_incoming(struct socket *so, void *arg, int waitflag) 844 { 845 const node_p node = arg; 846 const priv_p priv = NG_NODE_PRIVATE(node); 847 struct mbuf *m; 848 struct uio auio; 849 int s, flags, error; 850 851 s = splnet(); 852 853 /* Sanity check */ 854 if (NG_NODE_NOT_VALID(node)) { 855 splx(s); 856 return; 857 } 858 KASSERT(so == priv->so, ("%s: wrong socket", __FUNCTION__)); 859 KASSERT(priv->hook != NULL, ("%s: no hook", __FUNCTION__)); 860 861 /* Read and forward available mbuf's */ 862 auio.uio_procp = NULL; 863 auio.uio_resid = 1000000000; 864 flags = MSG_DONTWAIT; 865 do { 866 if ((error = (*so->so_proto->pr_usrreqs->pru_soreceive) 867 (so, (struct sockaddr **)0, &auio, &m, 868 (struct mbuf **)0, &flags)) == 0 869 && m != NULL) { 870 struct mbuf *n; 871 872 /* Don't trust the various socket layers to get the 873 packet header and length correct (eg. kern/15175) */ 874 for (n = m, m->m_pkthdr.len = 0; n; n = n->m_next) 875 m->m_pkthdr.len += n->m_len; 876 NG_SEND_DATA_ONLY(error, priv->hook, m); 877 } 878 } while (error == 0 && m != NULL); 879 splx(s); 880 } 881 882 /* 883 * Parse out either an integer value or an alias. 884 */ 885 static int 886 ng_ksocket_parse(const struct ng_ksocket_alias *aliases, 887 const char *s, int family) 888 { 889 int k, val; 890 char *eptr; 891 892 /* Try aliases */ 893 for (k = 0; aliases[k].name != NULL; k++) { 894 if (strcmp(s, aliases[k].name) == 0 895 && aliases[k].family == family) 896 return aliases[k].value; 897 } 898 899 /* Try parsing as a number */ 900 val = (int)strtoul(s, &eptr, 10); 901 if (val < 0 || *eptr != '\0') 902 return (-1); 903 return (val); 904 } 905 906