1 /* 2 * ng_ksocket.c 3 */ 4 5 /*- 6 * Copyright (c) 1996-1999 Whistle Communications, Inc. 7 * All rights reserved. 8 * 9 * Subject to the following obligations and disclaimer of warranty, use and 10 * redistribution of this software, in source or object code forms, with or 11 * without modifications are expressly permitted by Whistle Communications; 12 * provided, however, that: 13 * 1. Any and all reproductions of the source or object code must include the 14 * copyright notice above and the following disclaimer of warranties; and 15 * 2. No rights are granted, in any manner or form, to use Whistle 16 * Communications, Inc. trademarks, including the mark "WHISTLE 17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 18 * such appears in the above copyright notice or in the software. 19 * 20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 36 * OF SUCH DAMAGE. 37 * 38 * Author: Archie Cobbs <archie@freebsd.org> 39 * 40 * $FreeBSD$ 41 * $Whistle: ng_ksocket.c,v 1.1 1999/11/16 20:04:40 archie Exp $ 42 */ 43 44 /* 45 * Kernel socket node type. This node type is basically a kernel-mode 46 * version of a socket... kindof like the reverse of the socket node type. 47 */ 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/kernel.h> 52 #include <sys/mbuf.h> 53 #include <sys/proc.h> 54 #include <sys/malloc.h> 55 #include <sys/ctype.h> 56 #include <sys/protosw.h> 57 #include <sys/errno.h> 58 #include <sys/socket.h> 59 #include <sys/socketvar.h> 60 #include <sys/uio.h> 61 #include <sys/un.h> 62 63 #include <netgraph/ng_message.h> 64 #include <netgraph/netgraph.h> 65 #include <netgraph/ng_parse.h> 66 #include <netgraph/ng_ksocket.h> 67 68 #include <netinet/in.h> 69 #include <netinet/ip.h> 70 #include <netatalk/at.h> 71 72 #ifdef NG_SEPARATE_MALLOC 73 static MALLOC_DEFINE(M_NETGRAPH_KSOCKET, "netgraph_ksock", 74 "netgraph ksock node"); 75 #else 76 #define M_NETGRAPH_KSOCKET M_NETGRAPH 77 #endif 78 79 #define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0)) 80 #define SADATA_OFFSET (OFFSETOF(struct sockaddr, sa_data)) 81 82 /* Node private data */ 83 struct ng_ksocket_private { 84 node_p node; 85 hook_p hook; 86 struct socket *so; 87 int fn_sent; /* FN call on incoming event was sent */ 88 LIST_HEAD(, ng_ksocket_private) embryos; 89 LIST_ENTRY(ng_ksocket_private) siblings; 90 u_int32_t flags; 91 u_int32_t response_token; 92 ng_ID_t response_addr; 93 }; 94 typedef struct ng_ksocket_private *priv_p; 95 96 /* Flags for priv_p */ 97 #define KSF_CONNECTING 0x00000001 /* Waiting for connection complete */ 98 #define KSF_ACCEPTING 0x00000002 /* Waiting for accept complete */ 99 #define KSF_EOFSEEN 0x00000004 /* Have sent 0-length EOF mbuf */ 100 #define KSF_CLONED 0x00000008 /* Cloned from an accepting socket */ 101 #define KSF_EMBRYONIC 0x00000010 /* Cloned node with no hooks yet */ 102 103 /* Netgraph node methods */ 104 static ng_constructor_t ng_ksocket_constructor; 105 static ng_rcvmsg_t ng_ksocket_rcvmsg; 106 static ng_shutdown_t ng_ksocket_shutdown; 107 static ng_newhook_t ng_ksocket_newhook; 108 static ng_rcvdata_t ng_ksocket_rcvdata; 109 static ng_connect_t ng_ksocket_connect; 110 static ng_disconnect_t ng_ksocket_disconnect; 111 112 /* Alias structure */ 113 struct ng_ksocket_alias { 114 const char *name; 115 const int value; 116 const int family; 117 }; 118 119 /* Protocol family aliases */ 120 static const struct ng_ksocket_alias ng_ksocket_families[] = { 121 { "local", PF_LOCAL }, 122 { "inet", PF_INET }, 123 { "inet6", PF_INET6 }, 124 { "atalk", PF_APPLETALK }, 125 { "atm", PF_ATM }, 126 { NULL, -1 }, 127 }; 128 129 /* Socket type aliases */ 130 static const struct ng_ksocket_alias ng_ksocket_types[] = { 131 { "stream", SOCK_STREAM }, 132 { "dgram", SOCK_DGRAM }, 133 { "raw", SOCK_RAW }, 134 { "rdm", SOCK_RDM }, 135 { "seqpacket", SOCK_SEQPACKET }, 136 { NULL, -1 }, 137 }; 138 139 /* Protocol aliases */ 140 static const struct ng_ksocket_alias ng_ksocket_protos[] = { 141 { "ip", IPPROTO_IP, PF_INET }, 142 { "raw", IPPROTO_RAW, PF_INET }, 143 { "icmp", IPPROTO_ICMP, PF_INET }, 144 { "igmp", IPPROTO_IGMP, PF_INET }, 145 { "tcp", IPPROTO_TCP, PF_INET }, 146 { "udp", IPPROTO_UDP, PF_INET }, 147 { "gre", IPPROTO_GRE, PF_INET }, 148 { "esp", IPPROTO_ESP, PF_INET }, 149 { "ah", IPPROTO_AH, PF_INET }, 150 { "swipe", IPPROTO_SWIPE, PF_INET }, 151 { "encap", IPPROTO_ENCAP, PF_INET }, 152 { "divert", IPPROTO_DIVERT, PF_INET }, 153 { "pim", IPPROTO_PIM, PF_INET }, 154 { "ddp", ATPROTO_DDP, PF_APPLETALK }, 155 { "aarp", ATPROTO_AARP, PF_APPLETALK }, 156 { NULL, -1 }, 157 }; 158 159 /* Helper functions */ 160 static int ng_ksocket_check_accept(priv_p); 161 static void ng_ksocket_finish_accept(priv_p); 162 static int ng_ksocket_incoming(struct socket *so, void *arg, int waitflag); 163 static int ng_ksocket_parse(const struct ng_ksocket_alias *aliases, 164 const char *s, int family); 165 static void ng_ksocket_incoming2(node_p node, hook_p hook, 166 void *arg1, int arg2); 167 168 /************************************************************************ 169 STRUCT SOCKADDR PARSE TYPE 170 ************************************************************************/ 171 172 /* Get the length of the data portion of a generic struct sockaddr */ 173 static int 174 ng_parse_generic_sockdata_getLength(const struct ng_parse_type *type, 175 const u_char *start, const u_char *buf) 176 { 177 const struct sockaddr *sa; 178 179 sa = (const struct sockaddr *)(buf - SADATA_OFFSET); 180 return (sa->sa_len < SADATA_OFFSET) ? 0 : sa->sa_len - SADATA_OFFSET; 181 } 182 183 /* Type for the variable length data portion of a generic struct sockaddr */ 184 static const struct ng_parse_type ng_ksocket_generic_sockdata_type = { 185 &ng_parse_bytearray_type, 186 &ng_parse_generic_sockdata_getLength 187 }; 188 189 /* Type for a generic struct sockaddr */ 190 static const struct ng_parse_struct_field 191 ng_parse_generic_sockaddr_type_fields[] = { 192 { "len", &ng_parse_uint8_type }, 193 { "family", &ng_parse_uint8_type }, 194 { "data", &ng_ksocket_generic_sockdata_type }, 195 { NULL } 196 }; 197 static const struct ng_parse_type ng_ksocket_generic_sockaddr_type = { 198 &ng_parse_struct_type, 199 &ng_parse_generic_sockaddr_type_fields 200 }; 201 202 /* Convert a struct sockaddr from ASCII to binary. If its a protocol 203 family that we specially handle, do that, otherwise defer to the 204 generic parse type ng_ksocket_generic_sockaddr_type. */ 205 static int 206 ng_ksocket_sockaddr_parse(const struct ng_parse_type *type, 207 const char *s, int *off, const u_char *const start, 208 u_char *const buf, int *buflen) 209 { 210 struct sockaddr *const sa = (struct sockaddr *)buf; 211 enum ng_parse_token tok; 212 char fambuf[32]; 213 int family, len; 214 char *t; 215 216 /* If next token is a left curly brace, use generic parse type */ 217 if ((tok = ng_parse_get_token(s, off, &len)) == T_LBRACE) { 218 return (*ng_ksocket_generic_sockaddr_type.supertype->parse) 219 (&ng_ksocket_generic_sockaddr_type, 220 s, off, start, buf, buflen); 221 } 222 223 /* Get socket address family followed by a slash */ 224 while (isspace(s[*off])) 225 (*off)++; 226 if ((t = strchr(s + *off, '/')) == NULL) 227 return (EINVAL); 228 if ((len = t - (s + *off)) > sizeof(fambuf) - 1) 229 return (EINVAL); 230 strncpy(fambuf, s + *off, len); 231 fambuf[len] = '\0'; 232 *off += len + 1; 233 if ((family = ng_ksocket_parse(ng_ksocket_families, fambuf, 0)) == -1) 234 return (EINVAL); 235 236 /* Set family */ 237 if (*buflen < SADATA_OFFSET) 238 return (ERANGE); 239 sa->sa_family = family; 240 241 /* Set family-specific data and length */ 242 switch (sa->sa_family) { 243 case PF_LOCAL: /* Get pathname */ 244 { 245 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path); 246 struct sockaddr_un *const sun = (struct sockaddr_un *)sa; 247 int toklen, pathlen; 248 char *path; 249 250 if ((path = ng_get_string_token(s, off, &toklen, NULL)) == NULL) 251 return (EINVAL); 252 pathlen = strlen(path); 253 if (pathlen > SOCK_MAXADDRLEN) { 254 free(path, M_NETGRAPH_KSOCKET); 255 return (E2BIG); 256 } 257 if (*buflen < pathoff + pathlen) { 258 free(path, M_NETGRAPH_KSOCKET); 259 return (ERANGE); 260 } 261 *off += toklen; 262 bcopy(path, sun->sun_path, pathlen); 263 sun->sun_len = pathoff + pathlen; 264 free(path, M_NETGRAPH_KSOCKET); 265 break; 266 } 267 268 case PF_INET: /* Get an IP address with optional port */ 269 { 270 struct sockaddr_in *const sin = (struct sockaddr_in *)sa; 271 int i; 272 273 /* Parse this: <ipaddress>[:port] */ 274 for (i = 0; i < 4; i++) { 275 u_long val; 276 char *eptr; 277 278 val = strtoul(s + *off, &eptr, 10); 279 if (val > 0xff || eptr == s + *off) 280 return (EINVAL); 281 *off += (eptr - (s + *off)); 282 ((u_char *)&sin->sin_addr)[i] = (u_char)val; 283 if (i < 3) { 284 if (s[*off] != '.') 285 return (EINVAL); 286 (*off)++; 287 } else if (s[*off] == ':') { 288 (*off)++; 289 val = strtoul(s + *off, &eptr, 10); 290 if (val > 0xffff || eptr == s + *off) 291 return (EINVAL); 292 *off += (eptr - (s + *off)); 293 sin->sin_port = htons(val); 294 } else 295 sin->sin_port = 0; 296 } 297 bzero(&sin->sin_zero, sizeof(sin->sin_zero)); 298 sin->sin_len = sizeof(*sin); 299 break; 300 } 301 302 #if 0 303 case PF_APPLETALK: /* XXX implement these someday */ 304 case PF_INET6: 305 #endif 306 307 default: 308 return (EINVAL); 309 } 310 311 /* Done */ 312 *buflen = sa->sa_len; 313 return (0); 314 } 315 316 /* Convert a struct sockaddr from binary to ASCII */ 317 static int 318 ng_ksocket_sockaddr_unparse(const struct ng_parse_type *type, 319 const u_char *data, int *off, char *cbuf, int cbuflen) 320 { 321 const struct sockaddr *sa = (const struct sockaddr *)(data + *off); 322 int slen = 0; 323 324 /* Output socket address, either in special or generic format */ 325 switch (sa->sa_family) { 326 case PF_LOCAL: 327 { 328 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path); 329 const struct sockaddr_un *sun = (const struct sockaddr_un *)sa; 330 const int pathlen = sun->sun_len - pathoff; 331 char pathbuf[SOCK_MAXADDRLEN + 1]; 332 char *pathtoken; 333 334 bcopy(sun->sun_path, pathbuf, pathlen); 335 if ((pathtoken = ng_encode_string(pathbuf, pathlen)) == NULL) 336 return (ENOMEM); 337 slen += snprintf(cbuf, cbuflen, "local/%s", pathtoken); 338 free(pathtoken, M_NETGRAPH_KSOCKET); 339 if (slen >= cbuflen) 340 return (ERANGE); 341 *off += sun->sun_len; 342 return (0); 343 } 344 345 case PF_INET: 346 { 347 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa; 348 349 slen += snprintf(cbuf, cbuflen, "inet/%d.%d.%d.%d", 350 ((const u_char *)&sin->sin_addr)[0], 351 ((const u_char *)&sin->sin_addr)[1], 352 ((const u_char *)&sin->sin_addr)[2], 353 ((const u_char *)&sin->sin_addr)[3]); 354 if (sin->sin_port != 0) { 355 slen += snprintf(cbuf + strlen(cbuf), 356 cbuflen - strlen(cbuf), ":%d", 357 (u_int)ntohs(sin->sin_port)); 358 } 359 if (slen >= cbuflen) 360 return (ERANGE); 361 *off += sizeof(*sin); 362 return(0); 363 } 364 365 #if 0 366 case PF_APPLETALK: /* XXX implement these someday */ 367 case PF_INET6: 368 #endif 369 370 default: 371 return (*ng_ksocket_generic_sockaddr_type.supertype->unparse) 372 (&ng_ksocket_generic_sockaddr_type, 373 data, off, cbuf, cbuflen); 374 } 375 } 376 377 /* Parse type for struct sockaddr */ 378 static const struct ng_parse_type ng_ksocket_sockaddr_type = { 379 NULL, 380 NULL, 381 NULL, 382 &ng_ksocket_sockaddr_parse, 383 &ng_ksocket_sockaddr_unparse, 384 NULL /* no such thing as a default struct sockaddr */ 385 }; 386 387 /************************************************************************ 388 STRUCT NG_KSOCKET_SOCKOPT PARSE TYPE 389 ************************************************************************/ 390 391 /* Get length of the struct ng_ksocket_sockopt value field, which is the 392 just the excess of the message argument portion over the length of 393 the struct ng_ksocket_sockopt. */ 394 static int 395 ng_parse_sockoptval_getLength(const struct ng_parse_type *type, 396 const u_char *start, const u_char *buf) 397 { 398 static const int offset = OFFSETOF(struct ng_ksocket_sockopt, value); 399 const struct ng_ksocket_sockopt *sopt; 400 const struct ng_mesg *msg; 401 402 sopt = (const struct ng_ksocket_sockopt *)(buf - offset); 403 msg = (const struct ng_mesg *)((const u_char *)sopt - sizeof(*msg)); 404 return msg->header.arglen - sizeof(*sopt); 405 } 406 407 /* Parse type for the option value part of a struct ng_ksocket_sockopt 408 XXX Eventually, we should handle the different socket options specially. 409 XXX This would avoid byte order problems, eg an integer value of 1 is 410 XXX going to be "[1]" for little endian or "[3=1]" for big endian. */ 411 static const struct ng_parse_type ng_ksocket_sockoptval_type = { 412 &ng_parse_bytearray_type, 413 &ng_parse_sockoptval_getLength 414 }; 415 416 /* Parse type for struct ng_ksocket_sockopt */ 417 static const struct ng_parse_struct_field ng_ksocket_sockopt_type_fields[] 418 = NG_KSOCKET_SOCKOPT_INFO(&ng_ksocket_sockoptval_type); 419 static const struct ng_parse_type ng_ksocket_sockopt_type = { 420 &ng_parse_struct_type, 421 &ng_ksocket_sockopt_type_fields 422 }; 423 424 /* Parse type for struct ng_ksocket_accept */ 425 static const struct ng_parse_struct_field ng_ksocket_accept_type_fields[] 426 = NGM_KSOCKET_ACCEPT_INFO; 427 static const struct ng_parse_type ng_ksocket_accept_type = { 428 &ng_parse_struct_type, 429 &ng_ksocket_accept_type_fields 430 }; 431 432 /* List of commands and how to convert arguments to/from ASCII */ 433 static const struct ng_cmdlist ng_ksocket_cmds[] = { 434 { 435 NGM_KSOCKET_COOKIE, 436 NGM_KSOCKET_BIND, 437 "bind", 438 &ng_ksocket_sockaddr_type, 439 NULL 440 }, 441 { 442 NGM_KSOCKET_COOKIE, 443 NGM_KSOCKET_LISTEN, 444 "listen", 445 &ng_parse_int32_type, 446 NULL 447 }, 448 { 449 NGM_KSOCKET_COOKIE, 450 NGM_KSOCKET_ACCEPT, 451 "accept", 452 NULL, 453 &ng_ksocket_accept_type 454 }, 455 { 456 NGM_KSOCKET_COOKIE, 457 NGM_KSOCKET_CONNECT, 458 "connect", 459 &ng_ksocket_sockaddr_type, 460 &ng_parse_int32_type 461 }, 462 { 463 NGM_KSOCKET_COOKIE, 464 NGM_KSOCKET_GETNAME, 465 "getname", 466 NULL, 467 &ng_ksocket_sockaddr_type 468 }, 469 { 470 NGM_KSOCKET_COOKIE, 471 NGM_KSOCKET_GETPEERNAME, 472 "getpeername", 473 NULL, 474 &ng_ksocket_sockaddr_type 475 }, 476 { 477 NGM_KSOCKET_COOKIE, 478 NGM_KSOCKET_SETOPT, 479 "setopt", 480 &ng_ksocket_sockopt_type, 481 NULL 482 }, 483 { 484 NGM_KSOCKET_COOKIE, 485 NGM_KSOCKET_GETOPT, 486 "getopt", 487 &ng_ksocket_sockopt_type, 488 &ng_ksocket_sockopt_type 489 }, 490 { 0 } 491 }; 492 493 /* Node type descriptor */ 494 static struct ng_type ng_ksocket_typestruct = { 495 .version = NG_ABI_VERSION, 496 .name = NG_KSOCKET_NODE_TYPE, 497 .constructor = ng_ksocket_constructor, 498 .rcvmsg = ng_ksocket_rcvmsg, 499 .shutdown = ng_ksocket_shutdown, 500 .newhook = ng_ksocket_newhook, 501 .connect = ng_ksocket_connect, 502 .rcvdata = ng_ksocket_rcvdata, 503 .disconnect = ng_ksocket_disconnect, 504 .cmdlist = ng_ksocket_cmds, 505 }; 506 NETGRAPH_INIT(ksocket, &ng_ksocket_typestruct); 507 508 #define ERROUT(x) do { error = (x); goto done; } while (0) 509 510 /************************************************************************ 511 NETGRAPH NODE STUFF 512 ************************************************************************/ 513 514 /* 515 * Node type constructor 516 * The NODE part is assumed to be all set up. 517 * There is already a reference to the node for us. 518 */ 519 static int 520 ng_ksocket_constructor(node_p node) 521 { 522 priv_p priv; 523 524 /* Allocate private structure */ 525 priv = malloc(sizeof(*priv), M_NETGRAPH_KSOCKET, M_NOWAIT | M_ZERO); 526 if (priv == NULL) 527 return (ENOMEM); 528 529 LIST_INIT(&priv->embryos); 530 /* cross link them */ 531 priv->node = node; 532 NG_NODE_SET_PRIVATE(node, priv); 533 534 /* Done */ 535 return (0); 536 } 537 538 /* 539 * Give our OK for a hook to be added. The hook name is of the 540 * form "<family>/<type>/<proto>" where the three components may 541 * be decimal numbers or else aliases from the above lists. 542 * 543 * Connecting a hook amounts to opening the socket. Disconnecting 544 * the hook closes the socket and destroys the node as well. 545 */ 546 static int 547 ng_ksocket_newhook(node_p node, hook_p hook, const char *name0) 548 { 549 struct thread *td = curthread; /* XXX broken */ 550 const priv_p priv = NG_NODE_PRIVATE(node); 551 char *s1, *s2, name[NG_HOOKSIZ]; 552 int family, type, protocol, error; 553 554 /* Check if we're already connected */ 555 if (priv->hook != NULL) 556 return (EISCONN); 557 558 if (priv->flags & KSF_CLONED) { 559 if (priv->flags & KSF_EMBRYONIC) { 560 /* Remove ourselves from our parent's embryo list */ 561 LIST_REMOVE(priv, siblings); 562 priv->flags &= ~KSF_EMBRYONIC; 563 } 564 } else { 565 /* Extract family, type, and protocol from hook name */ 566 snprintf(name, sizeof(name), "%s", name0); 567 s1 = name; 568 if ((s2 = strchr(s1, '/')) == NULL) 569 return (EINVAL); 570 *s2++ = '\0'; 571 family = ng_ksocket_parse(ng_ksocket_families, s1, 0); 572 if (family == -1) 573 return (EINVAL); 574 s1 = s2; 575 if ((s2 = strchr(s1, '/')) == NULL) 576 return (EINVAL); 577 *s2++ = '\0'; 578 type = ng_ksocket_parse(ng_ksocket_types, s1, 0); 579 if (type == -1) 580 return (EINVAL); 581 s1 = s2; 582 protocol = ng_ksocket_parse(ng_ksocket_protos, s1, family); 583 if (protocol == -1) 584 return (EINVAL); 585 586 /* Create the socket */ 587 error = socreate(family, &priv->so, type, protocol, 588 td->td_ucred, td); 589 if (error != 0) 590 return (error); 591 592 /* XXX call soreserve() ? */ 593 594 } 595 596 /* OK */ 597 priv->hook = hook; 598 599 /* 600 * In case of misconfigured routing a packet may reenter 601 * ksocket node recursively. Decouple stack to avoid possible 602 * panics about sleeping with locks held. 603 */ 604 NG_HOOK_FORCE_QUEUE(hook); 605 606 return(0); 607 } 608 609 static int 610 ng_ksocket_connect(hook_p hook) 611 { 612 node_p node = NG_HOOK_NODE(hook); 613 const priv_p priv = NG_NODE_PRIVATE(node); 614 struct socket *const so = priv->so; 615 616 /* Add our hook for incoming data and other events */ 617 SOCKBUF_LOCK(&priv->so->so_rcv); 618 soupcall_set(priv->so, SO_RCV, ng_ksocket_incoming, node); 619 SOCKBUF_UNLOCK(&priv->so->so_rcv); 620 SOCKBUF_LOCK(&priv->so->so_snd); 621 soupcall_set(priv->so, SO_SND, ng_ksocket_incoming, node); 622 SOCKBUF_UNLOCK(&priv->so->so_snd); 623 SOCK_LOCK(priv->so); 624 priv->so->so_state |= SS_NBIO; 625 SOCK_UNLOCK(priv->so); 626 /* 627 * --Original comment-- 628 * On a cloned socket we may have already received one or more 629 * upcalls which we couldn't handle without a hook. Handle 630 * those now. 631 * We cannot call the upcall function directly 632 * from here, because until this function has returned our 633 * hook isn't connected. 634 * 635 * ---meta comment for -current --- 636 * XXX This is dubius. 637 * Upcalls between the time that the hook was 638 * first created and now (on another processesor) will 639 * be earlier on the queue than the request to finalise the hook. 640 * By the time the hook is finalised, 641 * The queued upcalls will have happenned and the code 642 * will have discarded them because of a lack of a hook. 643 * (socket not open). 644 * 645 * This is a bad byproduct of the complicated way in which hooks 646 * are now created (3 daisy chained async events). 647 * 648 * Since we are a netgraph operation 649 * We know that we hold a lock on this node. This forces the 650 * request we make below to be queued rather than implemented 651 * immediatly which will cause the upcall function to be called a bit 652 * later. 653 * However, as we will run any waiting queued operations immediatly 654 * after doing this one, if we have not finalised the other end 655 * of the hook, those queued operations will fail. 656 */ 657 if (priv->flags & KSF_CLONED) { 658 ng_send_fn(node, NULL, &ng_ksocket_incoming2, so, M_NOWAIT); 659 } 660 661 return (0); 662 } 663 664 /* 665 * Receive a control message 666 */ 667 static int 668 ng_ksocket_rcvmsg(node_p node, item_p item, hook_p lasthook) 669 { 670 struct thread *td = curthread; /* XXX broken */ 671 const priv_p priv = NG_NODE_PRIVATE(node); 672 struct socket *const so = priv->so; 673 struct ng_mesg *resp = NULL; 674 int error = 0; 675 struct ng_mesg *msg; 676 ng_ID_t raddr; 677 678 NGI_GET_MSG(item, msg); 679 switch (msg->header.typecookie) { 680 case NGM_KSOCKET_COOKIE: 681 switch (msg->header.cmd) { 682 case NGM_KSOCKET_BIND: 683 { 684 struct sockaddr *const sa 685 = (struct sockaddr *)msg->data; 686 687 /* Sanity check */ 688 if (msg->header.arglen < SADATA_OFFSET 689 || msg->header.arglen < sa->sa_len) 690 ERROUT(EINVAL); 691 if (so == NULL) 692 ERROUT(ENXIO); 693 694 /* Bind */ 695 error = sobind(so, sa, td); 696 break; 697 } 698 case NGM_KSOCKET_LISTEN: 699 { 700 /* Sanity check */ 701 if (msg->header.arglen != sizeof(int32_t)) 702 ERROUT(EINVAL); 703 if (so == NULL) 704 ERROUT(ENXIO); 705 706 /* Listen */ 707 error = solisten(so, *((int32_t *)msg->data), td); 708 break; 709 } 710 711 case NGM_KSOCKET_ACCEPT: 712 { 713 /* Sanity check */ 714 if (msg->header.arglen != 0) 715 ERROUT(EINVAL); 716 if (so == NULL) 717 ERROUT(ENXIO); 718 719 /* Make sure the socket is capable of accepting */ 720 if (!(so->so_options & SO_ACCEPTCONN)) 721 ERROUT(EINVAL); 722 if (priv->flags & KSF_ACCEPTING) 723 ERROUT(EALREADY); 724 725 error = ng_ksocket_check_accept(priv); 726 if (error != 0 && error != EWOULDBLOCK) 727 ERROUT(error); 728 729 /* 730 * If a connection is already complete, take it. 731 * Otherwise let the upcall function deal with 732 * the connection when it comes in. 733 */ 734 priv->response_token = msg->header.token; 735 raddr = priv->response_addr = NGI_RETADDR(item); 736 if (error == 0) { 737 ng_ksocket_finish_accept(priv); 738 } else 739 priv->flags |= KSF_ACCEPTING; 740 break; 741 } 742 743 case NGM_KSOCKET_CONNECT: 744 { 745 struct sockaddr *const sa 746 = (struct sockaddr *)msg->data; 747 748 /* Sanity check */ 749 if (msg->header.arglen < SADATA_OFFSET 750 || msg->header.arglen < sa->sa_len) 751 ERROUT(EINVAL); 752 if (so == NULL) 753 ERROUT(ENXIO); 754 755 /* Do connect */ 756 if ((so->so_state & SS_ISCONNECTING) != 0) 757 ERROUT(EALREADY); 758 if ((error = soconnect(so, sa, td)) != 0) { 759 so->so_state &= ~SS_ISCONNECTING; 760 ERROUT(error); 761 } 762 if ((so->so_state & SS_ISCONNECTING) != 0) { 763 /* We will notify the sender when we connect */ 764 priv->response_token = msg->header.token; 765 raddr = priv->response_addr = NGI_RETADDR(item); 766 priv->flags |= KSF_CONNECTING; 767 ERROUT(EINPROGRESS); 768 } 769 break; 770 } 771 772 case NGM_KSOCKET_GETNAME: 773 case NGM_KSOCKET_GETPEERNAME: 774 { 775 int (*func)(struct socket *so, struct sockaddr **nam); 776 struct sockaddr *sa = NULL; 777 int len; 778 779 /* Sanity check */ 780 if (msg->header.arglen != 0) 781 ERROUT(EINVAL); 782 if (so == NULL) 783 ERROUT(ENXIO); 784 785 /* Get function */ 786 if (msg->header.cmd == NGM_KSOCKET_GETPEERNAME) { 787 if ((so->so_state 788 & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) 789 ERROUT(ENOTCONN); 790 func = so->so_proto->pr_usrreqs->pru_peeraddr; 791 } else 792 func = so->so_proto->pr_usrreqs->pru_sockaddr; 793 794 /* Get local or peer address */ 795 if ((error = (*func)(so, &sa)) != 0) 796 goto bail; 797 len = (sa == NULL) ? 0 : sa->sa_len; 798 799 /* Send it back in a response */ 800 NG_MKRESPONSE(resp, msg, len, M_NOWAIT); 801 if (resp == NULL) { 802 error = ENOMEM; 803 goto bail; 804 } 805 bcopy(sa, resp->data, len); 806 807 bail: 808 /* Cleanup */ 809 if (sa != NULL) 810 free(sa, M_SONAME); 811 break; 812 } 813 814 case NGM_KSOCKET_GETOPT: 815 { 816 struct ng_ksocket_sockopt *ksopt = 817 (struct ng_ksocket_sockopt *)msg->data; 818 struct sockopt sopt; 819 820 /* Sanity check */ 821 if (msg->header.arglen != sizeof(*ksopt)) 822 ERROUT(EINVAL); 823 if (so == NULL) 824 ERROUT(ENXIO); 825 826 /* Get response with room for option value */ 827 NG_MKRESPONSE(resp, msg, sizeof(*ksopt) 828 + NG_KSOCKET_MAX_OPTLEN, M_NOWAIT); 829 if (resp == NULL) 830 ERROUT(ENOMEM); 831 832 /* Get socket option, and put value in the response */ 833 sopt.sopt_dir = SOPT_GET; 834 sopt.sopt_level = ksopt->level; 835 sopt.sopt_name = ksopt->name; 836 sopt.sopt_td = NULL; 837 sopt.sopt_valsize = NG_KSOCKET_MAX_OPTLEN; 838 ksopt = (struct ng_ksocket_sockopt *)resp->data; 839 sopt.sopt_val = ksopt->value; 840 if ((error = sogetopt(so, &sopt)) != 0) { 841 NG_FREE_MSG(resp); 842 break; 843 } 844 845 /* Set actual value length */ 846 resp->header.arglen = sizeof(*ksopt) 847 + sopt.sopt_valsize; 848 break; 849 } 850 851 case NGM_KSOCKET_SETOPT: 852 { 853 struct ng_ksocket_sockopt *const ksopt = 854 (struct ng_ksocket_sockopt *)msg->data; 855 const int valsize = msg->header.arglen - sizeof(*ksopt); 856 struct sockopt sopt; 857 858 /* Sanity check */ 859 if (valsize < 0) 860 ERROUT(EINVAL); 861 if (so == NULL) 862 ERROUT(ENXIO); 863 864 /* Set socket option */ 865 sopt.sopt_dir = SOPT_SET; 866 sopt.sopt_level = ksopt->level; 867 sopt.sopt_name = ksopt->name; 868 sopt.sopt_val = ksopt->value; 869 sopt.sopt_valsize = valsize; 870 sopt.sopt_td = NULL; 871 error = sosetopt(so, &sopt); 872 break; 873 } 874 875 default: 876 error = EINVAL; 877 break; 878 } 879 break; 880 default: 881 error = EINVAL; 882 break; 883 } 884 done: 885 NG_RESPOND_MSG(error, node, item, resp); 886 NG_FREE_MSG(msg); 887 return (error); 888 } 889 890 /* 891 * Receive incoming data on our hook. Send it out the socket. 892 */ 893 static int 894 ng_ksocket_rcvdata(hook_p hook, item_p item) 895 { 896 struct thread *td = curthread; /* XXX broken */ 897 const node_p node = NG_HOOK_NODE(hook); 898 const priv_p priv = NG_NODE_PRIVATE(node); 899 struct socket *const so = priv->so; 900 struct sockaddr *sa = NULL; 901 int error; 902 struct mbuf *m; 903 #ifdef ALIGNED_POINTER 904 struct mbuf *n; 905 #endif /* ALIGNED_POINTER */ 906 struct sa_tag *stag; 907 908 /* Extract data */ 909 NGI_GET_M(item, m); 910 NG_FREE_ITEM(item); 911 #ifdef ALIGNED_POINTER 912 if (!ALIGNED_POINTER(mtod(m, caddr_t), uint32_t)) { 913 n = m_defrag(m, M_NOWAIT); 914 if (n == NULL) { 915 m_freem(m); 916 return (ENOBUFS); 917 } 918 m = n; 919 } 920 #endif /* ALIGNED_POINTER */ 921 /* 922 * Look if socket address is stored in packet tags. 923 * If sockaddr is ours, or provided by a third party (zero id), 924 * then we accept it. 925 */ 926 if (((stag = (struct sa_tag *)m_tag_locate(m, NGM_KSOCKET_COOKIE, 927 NG_KSOCKET_TAG_SOCKADDR, NULL)) != NULL) && 928 (stag->id == NG_NODE_ID(node) || stag->id == 0)) 929 sa = &stag->sa; 930 931 /* Reset specific mbuf flags to prevent addressing problems. */ 932 m->m_flags &= ~(M_BCAST|M_MCAST); 933 934 /* Send packet */ 935 error = sosend(so, sa, 0, m, 0, 0, td); 936 937 return (error); 938 } 939 940 /* 941 * Destroy node 942 */ 943 static int 944 ng_ksocket_shutdown(node_p node) 945 { 946 const priv_p priv = NG_NODE_PRIVATE(node); 947 priv_p embryo; 948 949 /* Close our socket (if any) */ 950 if (priv->so != NULL) { 951 SOCKBUF_LOCK(&priv->so->so_rcv); 952 soupcall_clear(priv->so, SO_RCV); 953 SOCKBUF_UNLOCK(&priv->so->so_rcv); 954 SOCKBUF_LOCK(&priv->so->so_snd); 955 soupcall_clear(priv->so, SO_SND); 956 SOCKBUF_UNLOCK(&priv->so->so_snd); 957 soclose(priv->so); 958 priv->so = NULL; 959 } 960 961 /* If we are an embryo, take ourselves out of the parent's list */ 962 if (priv->flags & KSF_EMBRYONIC) { 963 LIST_REMOVE(priv, siblings); 964 priv->flags &= ~KSF_EMBRYONIC; 965 } 966 967 /* Remove any embryonic children we have */ 968 while (!LIST_EMPTY(&priv->embryos)) { 969 embryo = LIST_FIRST(&priv->embryos); 970 ng_rmnode_self(embryo->node); 971 } 972 973 /* Take down netgraph node */ 974 bzero(priv, sizeof(*priv)); 975 free(priv, M_NETGRAPH_KSOCKET); 976 NG_NODE_SET_PRIVATE(node, NULL); 977 NG_NODE_UNREF(node); /* let the node escape */ 978 return (0); 979 } 980 981 /* 982 * Hook disconnection 983 */ 984 static int 985 ng_ksocket_disconnect(hook_p hook) 986 { 987 KASSERT(NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0, 988 ("%s: numhooks=%d?", __func__, 989 NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)))); 990 if (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))) 991 ng_rmnode_self(NG_HOOK_NODE(hook)); 992 return (0); 993 } 994 995 /************************************************************************ 996 HELPER STUFF 997 ************************************************************************/ 998 /* 999 * You should not "just call" a netgraph node function from an external 1000 * asynchronous event. This is because in doing so you are ignoring the 1001 * locking on the netgraph nodes. Instead call your function via ng_send_fn(). 1002 * This will call the function you chose, but will first do all the 1003 * locking rigmarole. Your function MAY only be called at some distant future 1004 * time (several millisecs away) so don't give it any arguments 1005 * that may be revoked soon (e.g. on your stack). 1006 * 1007 * To decouple stack, we use queue version of ng_send_fn(). 1008 */ 1009 1010 static int 1011 ng_ksocket_incoming(struct socket *so, void *arg, int waitflag) 1012 { 1013 const node_p node = arg; 1014 const priv_p priv = NG_NODE_PRIVATE(node); 1015 int wait = ((waitflag & M_WAITOK) ? NG_WAITOK : 0) | NG_QUEUE; 1016 1017 /* 1018 * Even if node is not locked, as soon as we are called, we assume 1019 * it exist and it's private area is valid. With some care we can 1020 * access it. Mark node that incoming event for it was sent to 1021 * avoid unneded queue trashing. 1022 */ 1023 if (atomic_cmpset_int(&priv->fn_sent, 0, 1) && 1024 ng_send_fn1(node, NULL, &ng_ksocket_incoming2, so, 0, wait)) { 1025 atomic_store_rel_int(&priv->fn_sent, 0); 1026 } 1027 return (SU_OK); 1028 } 1029 1030 1031 /* 1032 * When incoming data is appended to the socket, we get notified here. 1033 * This is also called whenever a significant event occurs for the socket. 1034 * Our original caller may have queued this even some time ago and 1035 * we cannot trust that he even still exists. The node however is being 1036 * held with a reference by the queueing code and guarantied to be valid. 1037 */ 1038 static void 1039 ng_ksocket_incoming2(node_p node, hook_p hook, void *arg1, int arg2) 1040 { 1041 struct socket *so = arg1; 1042 const priv_p priv = NG_NODE_PRIVATE(node); 1043 struct ng_mesg *response; 1044 int error; 1045 1046 KASSERT(so == priv->so, ("%s: wrong socket", __func__)); 1047 1048 /* Allow next incoming event to be queued. */ 1049 atomic_store_rel_int(&priv->fn_sent, 0); 1050 1051 /* Check whether a pending connect operation has completed */ 1052 if (priv->flags & KSF_CONNECTING) { 1053 if ((error = so->so_error) != 0) { 1054 so->so_error = 0; 1055 so->so_state &= ~SS_ISCONNECTING; 1056 } 1057 if (!(so->so_state & SS_ISCONNECTING)) { 1058 NG_MKMESSAGE(response, NGM_KSOCKET_COOKIE, 1059 NGM_KSOCKET_CONNECT, sizeof(int32_t), M_NOWAIT); 1060 if (response != NULL) { 1061 response->header.flags |= NGF_RESP; 1062 response->header.token = priv->response_token; 1063 *(int32_t *)response->data = error; 1064 /* 1065 * send an async "response" message 1066 * to the node that set us up 1067 * (if it still exists) 1068 */ 1069 NG_SEND_MSG_ID(error, node, 1070 response, priv->response_addr, 0); 1071 } 1072 priv->flags &= ~KSF_CONNECTING; 1073 } 1074 } 1075 1076 /* Check whether a pending accept operation has completed */ 1077 if (priv->flags & KSF_ACCEPTING) { 1078 error = ng_ksocket_check_accept(priv); 1079 if (error != EWOULDBLOCK) 1080 priv->flags &= ~KSF_ACCEPTING; 1081 if (error == 0) 1082 ng_ksocket_finish_accept(priv); 1083 } 1084 1085 /* 1086 * If we don't have a hook, we must handle data events later. When 1087 * the hook gets created and is connected, this upcall function 1088 * will be called again. 1089 */ 1090 if (priv->hook == NULL) 1091 return; 1092 1093 /* Read and forward available mbufs. */ 1094 while (1) { 1095 struct uio uio; 1096 struct sockaddr *sa; 1097 struct mbuf *m; 1098 int flags; 1099 1100 /* Try to get next packet from socket. */ 1101 uio.uio_td = NULL; 1102 uio.uio_resid = IP_MAXPACKET; 1103 flags = MSG_DONTWAIT; 1104 sa = NULL; 1105 if ((error = soreceive(so, (so->so_state & SS_ISCONNECTED) ? 1106 NULL : &sa, &uio, &m, NULL, &flags)) != 0) 1107 break; 1108 1109 /* See if we got anything. */ 1110 if (flags & MSG_TRUNC) { 1111 m_freem(m); 1112 m = NULL; 1113 } 1114 if (m == NULL) { 1115 if (sa != NULL) 1116 free(sa, M_SONAME); 1117 break; 1118 } 1119 1120 KASSERT(m->m_nextpkt == NULL, ("%s: nextpkt", __func__)); 1121 1122 /* 1123 * Stream sockets do not have packet boundaries, so 1124 * we have to allocate a header mbuf and attach the 1125 * stream of data to it. 1126 */ 1127 if (so->so_type == SOCK_STREAM) { 1128 struct mbuf *mh; 1129 1130 mh = m_gethdr(M_NOWAIT, MT_DATA); 1131 if (mh == NULL) { 1132 m_freem(m); 1133 if (sa != NULL) 1134 free(sa, M_SONAME); 1135 break; 1136 } 1137 1138 mh->m_next = m; 1139 for (; m; m = m->m_next) 1140 mh->m_pkthdr.len += m->m_len; 1141 m = mh; 1142 } 1143 1144 /* Put peer's socket address (if any) into a tag */ 1145 if (sa != NULL) { 1146 struct sa_tag *stag; 1147 1148 stag = (struct sa_tag *)m_tag_alloc(NGM_KSOCKET_COOKIE, 1149 NG_KSOCKET_TAG_SOCKADDR, sizeof(ng_ID_t) + 1150 sa->sa_len, M_NOWAIT); 1151 if (stag == NULL) { 1152 free(sa, M_SONAME); 1153 goto sendit; 1154 } 1155 bcopy(sa, &stag->sa, sa->sa_len); 1156 free(sa, M_SONAME); 1157 stag->id = NG_NODE_ID(node); 1158 m_tag_prepend(m, &stag->tag); 1159 } 1160 1161 sendit: /* Forward data with optional peer sockaddr as packet tag */ 1162 NG_SEND_DATA_ONLY(error, priv->hook, m); 1163 } 1164 1165 /* 1166 * If the peer has closed the connection, forward a 0-length mbuf 1167 * to indicate end-of-file. 1168 */ 1169 if (so->so_rcv.sb_state & SBS_CANTRCVMORE && 1170 !(priv->flags & KSF_EOFSEEN)) { 1171 struct mbuf *m; 1172 1173 m = m_gethdr(M_NOWAIT, MT_DATA); 1174 if (m != NULL) 1175 NG_SEND_DATA_ONLY(error, priv->hook, m); 1176 priv->flags |= KSF_EOFSEEN; 1177 } 1178 } 1179 1180 /* 1181 * Check for a completed incoming connection and return 0 if one is found. 1182 * Otherwise return the appropriate error code. 1183 */ 1184 static int 1185 ng_ksocket_check_accept(priv_p priv) 1186 { 1187 struct socket *const head = priv->so; 1188 int error; 1189 1190 if ((error = head->so_error) != 0) { 1191 head->so_error = 0; 1192 return error; 1193 } 1194 /* Unlocked read. */ 1195 if (TAILQ_EMPTY(&head->so_comp)) { 1196 if (head->so_rcv.sb_state & SBS_CANTRCVMORE) 1197 return ECONNABORTED; 1198 return EWOULDBLOCK; 1199 } 1200 return 0; 1201 } 1202 1203 /* 1204 * Handle the first completed incoming connection, assumed to be already 1205 * on the socket's so_comp queue. 1206 */ 1207 static void 1208 ng_ksocket_finish_accept(priv_p priv) 1209 { 1210 struct socket *const head = priv->so; 1211 struct socket *so; 1212 struct sockaddr *sa = NULL; 1213 struct ng_mesg *resp; 1214 struct ng_ksocket_accept *resp_data; 1215 node_p node; 1216 priv_p priv2; 1217 int len; 1218 int error; 1219 1220 ACCEPT_LOCK(); 1221 so = TAILQ_FIRST(&head->so_comp); 1222 if (so == NULL) { /* Should never happen */ 1223 ACCEPT_UNLOCK(); 1224 return; 1225 } 1226 TAILQ_REMOVE(&head->so_comp, so, so_list); 1227 head->so_qlen--; 1228 so->so_qstate &= ~SQ_COMP; 1229 so->so_head = NULL; 1230 SOCK_LOCK(so); 1231 soref(so); 1232 so->so_state |= SS_NBIO; 1233 SOCK_UNLOCK(so); 1234 ACCEPT_UNLOCK(); 1235 1236 /* XXX KNOTE_UNLOCKED(&head->so_rcv.sb_sel.si_note, 0); */ 1237 1238 soaccept(so, &sa); 1239 1240 len = OFFSETOF(struct ng_ksocket_accept, addr); 1241 if (sa != NULL) 1242 len += sa->sa_len; 1243 1244 NG_MKMESSAGE(resp, NGM_KSOCKET_COOKIE, NGM_KSOCKET_ACCEPT, len, 1245 M_NOWAIT); 1246 if (resp == NULL) { 1247 soclose(so); 1248 goto out; 1249 } 1250 resp->header.flags |= NGF_RESP; 1251 resp->header.token = priv->response_token; 1252 1253 /* Clone a ksocket node to wrap the new socket */ 1254 error = ng_make_node_common(&ng_ksocket_typestruct, &node); 1255 if (error) { 1256 free(resp, M_NETGRAPH); 1257 soclose(so); 1258 goto out; 1259 } 1260 1261 if (ng_ksocket_constructor(node) != 0) { 1262 NG_NODE_UNREF(node); 1263 free(resp, M_NETGRAPH); 1264 soclose(so); 1265 goto out; 1266 } 1267 1268 priv2 = NG_NODE_PRIVATE(node); 1269 priv2->so = so; 1270 priv2->flags |= KSF_CLONED | KSF_EMBRYONIC; 1271 1272 /* 1273 * Insert the cloned node into a list of embryonic children 1274 * on the parent node. When a hook is created on the cloned 1275 * node it will be removed from this list. When the parent 1276 * is destroyed it will destroy any embryonic children it has. 1277 */ 1278 LIST_INSERT_HEAD(&priv->embryos, priv2, siblings); 1279 1280 SOCKBUF_LOCK(&so->so_rcv); 1281 soupcall_set(so, SO_RCV, ng_ksocket_incoming, node); 1282 SOCKBUF_UNLOCK(&so->so_rcv); 1283 SOCKBUF_LOCK(&so->so_snd); 1284 soupcall_set(so, SO_SND, ng_ksocket_incoming, node); 1285 SOCKBUF_UNLOCK(&so->so_snd); 1286 1287 /* Fill in the response data and send it or return it to the caller */ 1288 resp_data = (struct ng_ksocket_accept *)resp->data; 1289 resp_data->nodeid = NG_NODE_ID(node); 1290 if (sa != NULL) 1291 bcopy(sa, &resp_data->addr, sa->sa_len); 1292 NG_SEND_MSG_ID(error, node, resp, priv->response_addr, 0); 1293 1294 out: 1295 if (sa != NULL) 1296 free(sa, M_SONAME); 1297 } 1298 1299 /* 1300 * Parse out either an integer value or an alias. 1301 */ 1302 static int 1303 ng_ksocket_parse(const struct ng_ksocket_alias *aliases, 1304 const char *s, int family) 1305 { 1306 int k, val; 1307 char *eptr; 1308 1309 /* Try aliases */ 1310 for (k = 0; aliases[k].name != NULL; k++) { 1311 if (strcmp(s, aliases[k].name) == 0 1312 && aliases[k].family == family) 1313 return aliases[k].value; 1314 } 1315 1316 /* Try parsing as a number */ 1317 val = (int)strtoul(s, &eptr, 10); 1318 if (val < 0 || *eptr != '\0') 1319 return (-1); 1320 return (val); 1321 } 1322 1323