ng_ksocket.c revision 70700
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: head/sys/netgraph/ng_ksocket.c 70700 2001-01-06 00:46:47Z julian $ 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#define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0)) 71#define SADATA_OFFSET (OFFSETOF(struct sockaddr, sa_data)) 72 73/* Node private data */ 74struct ng_ksocket_private { 75 hook_p hook; 76 struct socket *so; 77}; 78typedef struct ng_ksocket_private *priv_p; 79 80/* Netgraph node methods */ 81static ng_constructor_t ng_ksocket_constructor; 82static ng_rcvmsg_t ng_ksocket_rcvmsg; 83static ng_shutdown_t ng_ksocket_shutdown; 84static ng_newhook_t ng_ksocket_newhook; 85static ng_rcvdata_t ng_ksocket_rcvdata; 86static ng_disconnect_t ng_ksocket_disconnect; 87 88/* Alias structure */ 89struct ng_ksocket_alias { 90 const char *name; 91 const int value; 92 const int family; 93}; 94 95/* Protocol family aliases */ 96static const struct ng_ksocket_alias ng_ksocket_families[] = { 97 { "local", PF_LOCAL }, 98 { "inet", PF_INET }, 99 { "inet6", PF_INET6 }, 100 { "atalk", PF_APPLETALK }, 101 { "ipx", PF_IPX }, 102 { "atm", PF_ATM }, 103 { NULL, -1 }, 104}; 105 106/* Socket type aliases */ 107static const struct ng_ksocket_alias ng_ksocket_types[] = { 108 { "stream", SOCK_STREAM }, 109 { "dgram", SOCK_DGRAM }, 110 { "raw", SOCK_RAW }, 111 { "rdm", SOCK_RDM }, 112 { "seqpacket", SOCK_SEQPACKET }, 113 { NULL, -1 }, 114}; 115 116/* Protocol aliases */ 117static const struct ng_ksocket_alias ng_ksocket_protos[] = { 118 { "ip", IPPROTO_IP, PF_INET }, 119 { "raw", IPPROTO_IP, PF_INET }, 120 { "icmp", IPPROTO_ICMP, PF_INET }, 121 { "igmp", IPPROTO_IGMP, PF_INET }, 122 { "tcp", IPPROTO_TCP, PF_INET }, 123 { "udp", IPPROTO_UDP, PF_INET }, 124 { "gre", IPPROTO_GRE, PF_INET }, 125 { "esp", IPPROTO_ESP, PF_INET }, 126 { "ah", IPPROTO_AH, PF_INET }, 127 { "swipe", IPPROTO_SWIPE, PF_INET }, 128 { "encap", IPPROTO_ENCAP, PF_INET }, 129 { "divert", IPPROTO_DIVERT, PF_INET }, 130 { "ddp", ATPROTO_DDP, PF_APPLETALK }, 131 { "aarp", ATPROTO_AARP, PF_APPLETALK }, 132 { NULL, -1 }, 133}; 134 135/* Helper functions */ 136static void ng_ksocket_incoming(struct socket *so, void *arg, int waitflag); 137static int ng_ksocket_parse(const struct ng_ksocket_alias *aliases, 138 const char *s, int family); 139 140/************************************************************************ 141 STRUCT SOCKADDR PARSE TYPE 142 ************************************************************************/ 143 144/* Get the length of the data portion of a generic struct sockaddr */ 145static int 146ng_parse_generic_sockdata_getLength(const struct ng_parse_type *type, 147 const u_char *start, const u_char *buf) 148{ 149 const struct sockaddr *sa; 150 151 sa = (const struct sockaddr *)(buf - SADATA_OFFSET); 152 return (sa->sa_len < SADATA_OFFSET) ? 0 : sa->sa_len - SADATA_OFFSET; 153} 154 155/* Type for the variable length data portion of a generic struct sockaddr */ 156static const struct ng_parse_type ng_ksocket_generic_sockdata_type = { 157 &ng_parse_bytearray_type, 158 &ng_parse_generic_sockdata_getLength 159}; 160 161/* Type for a generic struct sockaddr */ 162static const struct ng_parse_struct_info ng_parse_generic_sockaddr_type_info = { 163 { 164 { "len", &ng_parse_uint8_type }, 165 { "family", &ng_parse_uint8_type }, 166 { "data", &ng_ksocket_generic_sockdata_type }, 167 { NULL } 168 } 169}; 170static const struct ng_parse_type ng_ksocket_generic_sockaddr_type = { 171 &ng_parse_struct_type, 172 &ng_parse_generic_sockaddr_type_info 173}; 174 175/* Convert a struct sockaddr from ASCII to binary. If its a protocol 176 family that we specially handle, do that, otherwise defer to the 177 generic parse type ng_ksocket_generic_sockaddr_type. */ 178static int 179ng_ksocket_sockaddr_parse(const struct ng_parse_type *type, 180 const char *s, int *off, const u_char *const start, 181 u_char *const buf, int *buflen) 182{ 183 struct sockaddr *const sa = (struct sockaddr *)buf; 184 enum ng_parse_token tok; 185 char fambuf[32]; 186 int family, len; 187 char *t; 188 189 /* If next token is a left curly brace, use generic parse type */ 190 if ((tok = ng_parse_get_token(s, off, &len)) == T_LBRACE) { 191 return (*ng_ksocket_generic_sockaddr_type.supertype->parse) 192 (&ng_ksocket_generic_sockaddr_type, 193 s, off, start, buf, buflen); 194 } 195 196 /* Get socket address family followed by a slash */ 197 while (isspace(s[*off])) 198 (*off)++; 199 if ((t = index(s + *off, '/')) == NULL) 200 return (EINVAL); 201 if ((len = t - (s + *off)) > sizeof(fambuf) - 1) 202 return (EINVAL); 203 strncpy(fambuf, s + *off, len); 204 fambuf[len] = '\0'; 205 *off += len + 1; 206 if ((family = ng_ksocket_parse(ng_ksocket_families, fambuf, 0)) == -1) 207 return (EINVAL); 208 209 /* Set family */ 210 if (*buflen < SADATA_OFFSET) 211 return (ERANGE); 212 sa->sa_family = family; 213 214 /* Set family-specific data and length */ 215 switch (sa->sa_family) { 216 case PF_LOCAL: /* Get pathname */ 217 { 218 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path); 219 struct sockaddr_un *const sun = (struct sockaddr_un *)sa; 220 int toklen, pathlen; 221 char *path; 222 223 if ((path = ng_get_string_token(s, off, &toklen, NULL)) == NULL) 224 return (EINVAL); 225 pathlen = strlen(path); 226 if (pathlen > SOCK_MAXADDRLEN) { 227 FREE(path, M_NETGRAPH); 228 return (E2BIG); 229 } 230 if (*buflen < pathoff + pathlen) { 231 FREE(path, M_NETGRAPH); 232 return (ERANGE); 233 } 234 *off += toklen; 235 bcopy(path, sun->sun_path, pathlen); 236 sun->sun_len = pathoff + pathlen; 237 FREE(path, M_NETGRAPH); 238 break; 239 } 240 241 case PF_INET: /* Get an IP address with optional port */ 242 { 243 struct sockaddr_in *const sin = (struct sockaddr_in *)sa; 244 int i; 245 246 /* Parse this: <ipaddress>[:port] */ 247 for (i = 0; i < 4; i++) { 248 u_long val; 249 char *eptr; 250 251 val = strtoul(s + *off, &eptr, 10); 252 if (val > 0xff || eptr == s + *off) 253 return (EINVAL); 254 *off += (eptr - (s + *off)); 255 ((u_char *)&sin->sin_addr)[i] = (u_char)val; 256 if (i < 3) { 257 if (s[*off] != '.') 258 return (EINVAL); 259 (*off)++; 260 } else if (s[*off] == ':') { 261 (*off)++; 262 val = strtoul(s + *off, &eptr, 10); 263 if (val > 0xffff || eptr == s + *off) 264 return (EINVAL); 265 *off += (eptr - (s + *off)); 266 sin->sin_port = htons(val); 267 } else 268 sin->sin_port = 0; 269 } 270 bzero(&sin->sin_zero, sizeof(sin->sin_zero)); 271 sin->sin_len = sizeof(*sin); 272 break; 273 } 274 275#if 0 276 case PF_APPLETALK: /* XXX implement these someday */ 277 case PF_INET6: 278 case PF_IPX: 279#endif 280 281 default: 282 return (EINVAL); 283 } 284 285 /* Done */ 286 *buflen = sa->sa_len; 287 return (0); 288} 289 290/* Convert a struct sockaddr from binary to ASCII */ 291static int 292ng_ksocket_sockaddr_unparse(const struct ng_parse_type *type, 293 const u_char *data, int *off, char *cbuf, int cbuflen) 294{ 295 const struct sockaddr *sa = (const struct sockaddr *)(data + *off); 296 int slen = 0; 297 298 /* Output socket address, either in special or generic format */ 299 switch (sa->sa_family) { 300 case PF_LOCAL: 301 { 302 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path); 303 const struct sockaddr_un *sun = (const struct sockaddr_un *)sa; 304 const int pathlen = sun->sun_len - pathoff; 305 char pathbuf[SOCK_MAXADDRLEN + 1]; 306 char *pathtoken; 307 308 bcopy(sun->sun_path, pathbuf, pathlen); 309 if ((pathtoken = ng_encode_string(pathbuf, pathlen)) == NULL) 310 return (ENOMEM); 311 slen += snprintf(cbuf, cbuflen, "local/%s", pathtoken); 312 FREE(pathtoken, M_NETGRAPH); 313 if (slen >= cbuflen) 314 return (ERANGE); 315 *off += sun->sun_len; 316 return (0); 317 } 318 319 case PF_INET: 320 { 321 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa; 322 323 slen += snprintf(cbuf, cbuflen, "inet/%d.%d.%d.%d", 324 ((const u_char *)&sin->sin_addr)[0], 325 ((const u_char *)&sin->sin_addr)[1], 326 ((const u_char *)&sin->sin_addr)[2], 327 ((const u_char *)&sin->sin_addr)[3]); 328 if (sin->sin_port != 0) { 329 slen += snprintf(cbuf + strlen(cbuf), 330 cbuflen - strlen(cbuf), ":%d", 331 (u_int)ntohs(sin->sin_port)); 332 } 333 if (slen >= cbuflen) 334 return (ERANGE); 335 *off += sizeof(*sin); 336 return(0); 337 } 338 339#if 0 340 case PF_APPLETALK: /* XXX implement these someday */ 341 case PF_INET6: 342 case PF_IPX: 343#endif 344 345 default: 346 return (*ng_ksocket_generic_sockaddr_type.supertype->unparse) 347 (&ng_ksocket_generic_sockaddr_type, 348 data, off, cbuf, cbuflen); 349 } 350} 351 352/* Parse type for struct sockaddr */ 353static const struct ng_parse_type ng_ksocket_sockaddr_type = { 354 NULL, 355 NULL, 356 NULL, 357 &ng_ksocket_sockaddr_parse, 358 &ng_ksocket_sockaddr_unparse, 359 NULL /* no such thing as a default struct sockaddr */ 360}; 361 362/************************************************************************ 363 STRUCT NG_KSOCKET_SOCKOPT PARSE TYPE 364 ************************************************************************/ 365 366/* Get length of the struct ng_ksocket_sockopt value field, which is the 367 just the excess of the message argument portion over the length of 368 the struct ng_ksocket_sockopt. */ 369static int 370ng_parse_sockoptval_getLength(const struct ng_parse_type *type, 371 const u_char *start, const u_char *buf) 372{ 373 static const int offset = OFFSETOF(struct ng_ksocket_sockopt, value); 374 const struct ng_ksocket_sockopt *sopt; 375 const struct ng_mesg *msg; 376 377 sopt = (const struct ng_ksocket_sockopt *)(buf - offset); 378 msg = (const struct ng_mesg *)((const u_char *)sopt - sizeof(*msg)); 379 return msg->header.arglen - sizeof(*sopt); 380} 381 382/* Parse type for the option value part of a struct ng_ksocket_sockopt 383 XXX Eventually, we should handle the different socket options specially. 384 XXX This would avoid byte order problems, eg an integer value of 1 is 385 XXX going to be "[1]" for little endian or "[3=1]" for big endian. */ 386static const struct ng_parse_type ng_ksocket_sockoptval_type = { 387 &ng_parse_bytearray_type, 388 &ng_parse_sockoptval_getLength 389}; 390 391/* Parse type for struct ng_ksocket_sockopt */ 392static const struct ng_parse_struct_info ng_ksocket_sockopt_type_info 393 = NG_KSOCKET_SOCKOPT_INFO(&ng_ksocket_sockoptval_type); 394static const struct ng_parse_type ng_ksocket_sockopt_type = { 395 &ng_parse_struct_type, 396 &ng_ksocket_sockopt_type_info, 397}; 398 399/* List of commands and how to convert arguments to/from ASCII */ 400static const struct ng_cmdlist ng_ksocket_cmds[] = { 401 { 402 NGM_KSOCKET_COOKIE, 403 NGM_KSOCKET_BIND, 404 "bind", 405 &ng_ksocket_sockaddr_type, 406 NULL 407 }, 408 { 409 NGM_KSOCKET_COOKIE, 410 NGM_KSOCKET_LISTEN, 411 "listen", 412 &ng_parse_int32_type, 413 NULL 414 }, 415 { 416 NGM_KSOCKET_COOKIE, 417 NGM_KSOCKET_ACCEPT, 418 "accept", 419 NULL, 420 &ng_ksocket_sockaddr_type 421 }, 422 { 423 NGM_KSOCKET_COOKIE, 424 NGM_KSOCKET_CONNECT, 425 "connect", 426 &ng_ksocket_sockaddr_type, 427 NULL 428 }, 429 { 430 NGM_KSOCKET_COOKIE, 431 NGM_KSOCKET_GETNAME, 432 "getname", 433 NULL, 434 &ng_ksocket_sockaddr_type 435 }, 436 { 437 NGM_KSOCKET_COOKIE, 438 NGM_KSOCKET_GETPEERNAME, 439 "getpeername", 440 NULL, 441 &ng_ksocket_sockaddr_type 442 }, 443 { 444 NGM_KSOCKET_COOKIE, 445 NGM_KSOCKET_SETOPT, 446 "setopt", 447 &ng_ksocket_sockopt_type, 448 NULL 449 }, 450 { 451 NGM_KSOCKET_COOKIE, 452 NGM_KSOCKET_GETOPT, 453 "getopt", 454 &ng_ksocket_sockopt_type, 455 &ng_ksocket_sockopt_type 456 }, 457 { 0 } 458}; 459 460/* Node type descriptor */ 461static struct ng_type ng_ksocket_typestruct = { 462 NG_ABI_VERSION, 463 NG_KSOCKET_NODE_TYPE, 464 NULL, 465 ng_ksocket_constructor, 466 ng_ksocket_rcvmsg, 467 ng_ksocket_shutdown, 468 ng_ksocket_newhook, 469 NULL, 470 NULL, 471 ng_ksocket_rcvdata, 472 ng_ksocket_disconnect, 473 ng_ksocket_cmds 474}; 475NETGRAPH_INIT(ksocket, &ng_ksocket_typestruct); 476 477#define ERROUT(x) do { error = (x); goto done; } while (0) 478 479/************************************************************************ 480 NETGRAPH NODE STUFF 481 ************************************************************************/ 482 483/* 484 * Node type constructor 485 */ 486static int 487ng_ksocket_constructor(node_p node) 488{ 489 priv_p priv; 490 491 /* Allocate private structure */ 492 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 493 if (priv == NULL) 494 return (ENOMEM); 495 496 node->private = priv; 497 498 /* Done */ 499 return (0); 500} 501 502/* 503 * Give our OK for a hook to be added. The hook name is of the 504 * form "<family>:<type>:<proto>" where the three components may 505 * be decimal numbers or else aliases from the above lists. 506 * 507 * Connecting a hook amounts to opening the socket. Disconnecting 508 * the hook closes the socket and destroys the node as well. 509 */ 510static int 511ng_ksocket_newhook(node_p node, hook_p hook, const char *name0) 512{ 513 struct proc *p = curproc ? curproc : &proc0; /* XXX broken */ 514 const priv_p priv = node->private; 515 char *s1, *s2, name[NG_HOOKLEN+1]; 516 int family, type, protocol, error; 517 518 /* Check if we're already connected */ 519 if (priv->hook != NULL) 520 return (EISCONN); 521 522 /* Extract family, type, and protocol from hook name */ 523 snprintf(name, sizeof(name), "%s", name0); 524 s1 = name; 525 if ((s2 = index(s1, '/')) == NULL) 526 return (EINVAL); 527 *s2++ = '\0'; 528 if ((family = ng_ksocket_parse(ng_ksocket_families, s1, 0)) == -1) 529 return (EINVAL); 530 s1 = s2; 531 if ((s2 = index(s1, '/')) == NULL) 532 return (EINVAL); 533 *s2++ = '\0'; 534 if ((type = ng_ksocket_parse(ng_ksocket_types, s1, 0)) == -1) 535 return (EINVAL); 536 s1 = s2; 537 if ((protocol = ng_ksocket_parse(ng_ksocket_protos, s1, family)) == -1) 538 return (EINVAL); 539 540 /* Create the socket */ 541 if ((error = socreate(family, &priv->so, type, protocol, p)) != 0) 542 return (error); 543 544 /* XXX call soreserve() ? */ 545 546 /* Add our hook for incoming data */ 547 priv->so->so_upcallarg = (caddr_t)node; 548 priv->so->so_upcall = ng_ksocket_incoming; 549 priv->so->so_rcv.sb_flags |= SB_UPCALL; 550 551 /* OK */ 552 priv->hook = hook; 553 return (0); 554} 555 556/* 557 * Receive a control message 558 */ 559static int 560ng_ksocket_rcvmsg(node_p node, item_p item, hook_p lasthook) 561{ 562 struct proc *p = curproc ? curproc : &proc0; /* XXX broken */ 563 const priv_p priv = node->private; 564 struct socket *const so = priv->so; 565 struct ng_mesg *resp = NULL; 566 int error = 0; 567 struct ng_mesg *msg; 568 569 NGI_GET_MSG(item, msg); 570 switch (msg->header.typecookie) { 571 case NGM_KSOCKET_COOKIE: 572 switch (msg->header.cmd) { 573 case NGM_KSOCKET_BIND: 574 { 575 struct sockaddr *const sa 576 = (struct sockaddr *)msg->data; 577 578 /* Sanity check */ 579 if (msg->header.arglen < SADATA_OFFSET 580 || msg->header.arglen < sa->sa_len) 581 ERROUT(EINVAL); 582 if (so == NULL) 583 ERROUT(ENXIO); 584 585 /* Bind */ 586 error = sobind(so, sa, p); 587 break; 588 } 589 case NGM_KSOCKET_LISTEN: 590 { 591 /* Sanity check */ 592 if (msg->header.arglen != sizeof(int)) 593 ERROUT(EINVAL); 594 if (so == NULL) 595 ERROUT(ENXIO); 596 597 /* Listen */ 598 if ((error = solisten(so, *((int *)msg->data), p)) != 0) 599 break; 600 601 /* Notify sender when we get a connection attempt */ 602 /* XXX implement me */ 603 error = ENODEV; 604 break; 605 } 606 607 case NGM_KSOCKET_ACCEPT: 608 { 609 /* Sanity check */ 610 if (msg->header.arglen != 0) 611 ERROUT(EINVAL); 612 if (so == NULL) 613 ERROUT(ENXIO); 614 615 /* Accept on the socket in a non-blocking way */ 616 /* Create a new ksocket node for the new connection */ 617 /* Return a response with the peer's sockaddr and 618 the absolute name of the newly created node */ 619 620 /* XXX implement me */ 621 622 error = ENODEV; 623 break; 624 } 625 626 case NGM_KSOCKET_CONNECT: 627 { 628 struct sockaddr *const sa 629 = (struct sockaddr *)msg->data; 630 631 /* Sanity check */ 632 if (msg->header.arglen < SADATA_OFFSET 633 || msg->header.arglen < sa->sa_len) 634 ERROUT(EINVAL); 635 if (so == NULL) 636 ERROUT(ENXIO); 637 638 /* Do connect */ 639 if ((so->so_state & SS_ISCONNECTING) != 0) 640 ERROUT(EALREADY); 641 if ((error = soconnect(so, sa, p)) != 0) { 642 so->so_state &= ~SS_ISCONNECTING; 643 ERROUT(error); 644 } 645 if ((so->so_state & SS_ISCONNECTING) != 0) 646 /* Notify sender when we connect */ 647 /* XXX implement me */ 648 ERROUT(EINPROGRESS); 649 break; 650 } 651 652 case NGM_KSOCKET_GETNAME: 653 case NGM_KSOCKET_GETPEERNAME: 654 { 655 int (*func)(struct socket *so, struct sockaddr **nam); 656 struct sockaddr *sa = NULL; 657 int len; 658 659 /* Sanity check */ 660 if (msg->header.arglen != 0) 661 ERROUT(EINVAL); 662 if (so == NULL) 663 ERROUT(ENXIO); 664 665 /* Get function */ 666 if (msg->header.cmd == NGM_KSOCKET_GETPEERNAME) { 667 if ((so->so_state 668 & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) 669 ERROUT(ENOTCONN); 670 func = so->so_proto->pr_usrreqs->pru_peeraddr; 671 } else 672 func = so->so_proto->pr_usrreqs->pru_sockaddr; 673 674 /* Get local or peer address */ 675 if ((error = (*func)(so, &sa)) != 0) 676 goto bail; 677 len = (sa == NULL) ? 0 : sa->sa_len; 678 679 /* Send it back in a response */ 680 NG_MKRESPONSE(resp, msg, len, M_NOWAIT); 681 if (resp == NULL) { 682 error = ENOMEM; 683 goto bail; 684 } 685 bcopy(sa, resp->data, len); 686 687 bail: 688 /* Cleanup */ 689 if (sa != NULL) 690 FREE(sa, M_SONAME); 691 break; 692 } 693 694 case NGM_KSOCKET_GETOPT: 695 { 696 struct ng_ksocket_sockopt *ksopt = 697 (struct ng_ksocket_sockopt *)msg->data; 698 struct sockopt sopt; 699 700 /* Sanity check */ 701 if (msg->header.arglen != sizeof(*ksopt)) 702 ERROUT(EINVAL); 703 if (so == NULL) 704 ERROUT(ENXIO); 705 706 /* Get response with room for option value */ 707 NG_MKRESPONSE(resp, msg, sizeof(*ksopt) 708 + NG_KSOCKET_MAX_OPTLEN, M_NOWAIT); 709 if (resp == NULL) 710 ERROUT(ENOMEM); 711 712 /* Get socket option, and put value in the response */ 713 sopt.sopt_dir = SOPT_GET; 714 sopt.sopt_level = ksopt->level; 715 sopt.sopt_name = ksopt->name; 716 sopt.sopt_p = p; 717 sopt.sopt_valsize = NG_KSOCKET_MAX_OPTLEN; 718 ksopt = (struct ng_ksocket_sockopt *)resp->data; 719 sopt.sopt_val = ksopt->value; 720 if ((error = sogetopt(so, &sopt)) != 0) { 721 NG_FREE_MSG(resp); 722 break; 723 } 724 725 /* Set actual value length */ 726 resp->header.arglen = sizeof(*ksopt) 727 + sopt.sopt_valsize; 728 break; 729 } 730 731 case NGM_KSOCKET_SETOPT: 732 { 733 struct ng_ksocket_sockopt *const ksopt = 734 (struct ng_ksocket_sockopt *)msg->data; 735 const int valsize = msg->header.arglen - sizeof(*ksopt); 736 struct sockopt sopt; 737 738 /* Sanity check */ 739 if (valsize < 0) 740 ERROUT(EINVAL); 741 if (so == NULL) 742 ERROUT(ENXIO); 743 744 /* Set socket option */ 745 sopt.sopt_dir = SOPT_SET; 746 sopt.sopt_level = ksopt->level; 747 sopt.sopt_name = ksopt->name; 748 sopt.sopt_val = ksopt->value; 749 sopt.sopt_valsize = valsize; 750 sopt.sopt_p = p; 751 error = sosetopt(so, &sopt); 752 break; 753 } 754 755 default: 756 error = EINVAL; 757 break; 758 } 759 break; 760 default: 761 error = EINVAL; 762 break; 763 } 764done: 765 NG_RESPOND_MSG(error, node, item, resp); 766 NG_FREE_MSG(msg); 767 return (error); 768} 769 770/* 771 * Receive incoming data on our hook. Send it out the socket. 772 */ 773static int 774ng_ksocket_rcvdata(hook_p hook, item_p item) 775{ 776 struct proc *p = curproc ? curproc : &proc0; /* XXX broken */ 777 const node_p node = hook->node; 778 const priv_p priv = node->private; 779 struct socket *const so = priv->so; 780 int error; 781 struct mbuf *m; 782 783 NGI_GET_M(item, m); 784 NG_FREE_ITEM(item); 785 error = (*so->so_proto->pr_usrreqs->pru_sosend)(so, 0, 0, m, 0, 0, p); 786 return (error); 787} 788 789/* 790 * Destroy node 791 */ 792static int 793ng_ksocket_shutdown(node_p node) 794{ 795 const priv_p priv = node->private; 796 797 /* Close our socket (if any) */ 798 if (priv->so != NULL) { 799 800 priv->so->so_upcall = NULL; 801 priv->so->so_rcv.sb_flags &= ~SB_UPCALL; 802 soclose(priv->so); 803 priv->so = NULL; 804 } 805 806 /* Take down netgraph node */ 807 node->flags |= NG_INVALID; 808 bzero(priv, sizeof(*priv)); 809 FREE(priv, M_NETGRAPH); 810 node->private = NULL; 811 ng_unref(node); /* let the node escape */ 812 return (0); 813} 814 815/* 816 * Hook disconnection 817 */ 818static int 819ng_ksocket_disconnect(hook_p hook) 820{ 821 KASSERT(hook->node->numhooks == 0, 822 ("%s: numhooks=%d?", __FUNCTION__, hook->node->numhooks)); 823 if ((hook->node->flags & NG_INVALID) == 0) 824 ng_rmnode_self(hook->node); 825 return (0); 826} 827 828/************************************************************************ 829 HELPER STUFF 830 ************************************************************************/ 831 832/* 833 * When incoming data is appended to the socket, we get notified here. 834 */ 835static void 836ng_ksocket_incoming(struct socket *so, void *arg, int waitflag) 837{ 838 const node_p node = arg; 839 const priv_p priv = node->private; 840 struct mbuf *m; 841 struct uio auio; 842 int s, flags, error; 843 844 s = splnet(); 845 846 /* Sanity check */ 847 if ((node->flags & NG_INVALID) != 0) { 848 splx(s); 849 return; 850 } 851 KASSERT(so == priv->so, ("%s: wrong socket", __FUNCTION__)); 852 KASSERT(priv->hook != NULL, ("%s: no hook", __FUNCTION__)); 853 854 /* Read and forward available mbuf's */ 855 auio.uio_procp = NULL; 856 auio.uio_resid = 1000000000; 857 flags = MSG_DONTWAIT; 858 do { 859 if ((error = (*so->so_proto->pr_usrreqs->pru_soreceive) 860 (so, (struct sockaddr **)0, &auio, &m, 861 (struct mbuf **)0, &flags)) == 0 862 && m != NULL) { 863 struct mbuf *n; 864 865 /* Don't trust the various socket layers to get the 866 packet header and length correct (eg. kern/15175) */ 867 for (n = m, m->m_pkthdr.len = 0; n; n = n->m_next) 868 m->m_pkthdr.len += n->m_len; 869 NG_SEND_DATA_ONLY(error, priv->hook, m); 870 } 871 } while (error == 0 && m != NULL); 872 splx(s); 873} 874 875/* 876 * Parse out either an integer value or an alias. 877 */ 878static int 879ng_ksocket_parse(const struct ng_ksocket_alias *aliases, 880 const char *s, int family) 881{ 882 int k, val; 883 char *eptr; 884 885 /* Try aliases */ 886 for (k = 0; aliases[k].name != NULL; k++) { 887 if (strcmp(s, aliases[k].name) == 0 888 && aliases[k].family == family) 889 return aliases[k].value; 890 } 891 892 /* Try parsing as a number */ 893 val = (int)strtoul(s, &eptr, 10); 894 if (val < 0 || *eptr != '\0') 895 return (-1); 896 return (val); 897} 898 899