sys/netgraph/ksocket/ng_ksocket.c

   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: src/sys/netgraph/ng_ksocket.c,v 1.5.2.14 2003/08/24 08:24:38 hsu Exp $
  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/fcntl.h>
  58 #include <sys/socket.h>
  59 #include <sys/socketvar.h>
  60 #include <sys/socketops.h>
  61 #include <sys/uio.h>
  62 #include <sys/un.h>
  63
  64 #include <sys/thread2.h>
  65 #include <sys/socketvar2.h>
  66
  67 #include <netgraph/ng_message.h>
  68 #include <netgraph/netgraph.h>
  69 #include <netgraph/ng_parse.h>
  70 #include "ng_ksocket.h"
  71
  72 #include <netinet/in.h>
  73
  74 #define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0))
  75 #define SADATA_OFFSET   (OFFSETOF(struct sockaddr, sa_data))
  76
  77 /* Node private data */
  78 struct ng_ksocket_private {
  79         node_p          node;
  80         hook_p          hook;
  81         struct socket   *so;
  82         LIST_HEAD(, ng_ksocket_private) embryos;
  83         LIST_ENTRY(ng_ksocket_private)  siblings;
  84         u_int32_t       flags;
  85         u_int32_t       response_token;
  86         char            response_addr[NG_PATHSIZ];
  87 };
  88 typedef struct ng_ksocket_private *priv_p;
  89
  90 /* Flags for priv_p */
  91 #define KSF_CONNECTING  0x00000001      /* Waiting for connection complete */
  92 #define KSF_ACCEPTING   0x00000002      /* Waiting for accept complete */
  93 #define KSF_EOFSEEN     0x00000004      /* Have sent 0-length EOF mbuf */
  94 #define KSF_CLONED      0x00000008      /* Cloned from an accepting socket */
  95 #define KSF_EMBRYONIC   0x00000010      /* Cloned node with no hooks yet */
  96 #define KSF_SENDING     0x00000020      /* Sending on socket */
  97
  98 /* Internal commands which we send to ourselves */
  99 #define NGM_KSOCKET_INTERNAL_COOKIE     (NGM_KSOCKET_COOKIE + 1)
 100
 101 enum {
 102         NGM_KSOCKET_INTERNAL_UPCALL = 1
 103 };
 104
 105 /* Netgraph node methods */
 106 static ng_constructor_t ng_ksocket_constructor;
 107 static ng_rcvmsg_t      ng_ksocket_rcvmsg;
 108 static ng_shutdown_t    ng_ksocket_rmnode;
 109 static ng_newhook_t     ng_ksocket_newhook;
 110 static ng_rcvdata_t     ng_ksocket_rcvdata;
 111 static ng_disconnect_t  ng_ksocket_disconnect;
 112
 113 /* Alias structure */
 114 struct ng_ksocket_alias {
 115         const char      *name;
 116         const int       value;
 117         const int       family;
 118 };
 119
 120 /* Protocol family aliases */
 121 static const struct ng_ksocket_alias ng_ksocket_families[] = {
 122         { "local",      PF_LOCAL        },
 123         { "inet",       PF_INET         },
 124         { "inet6",      PF_INET6        },
 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         { NULL,         -1                                      },
 155 };
 156
 157 /* Helper functions */
 158 static int      ng_ksocket_check_accept(priv_p);
 159 static void     ng_ksocket_finish_accept(priv_p, struct ng_mesg **);
 160 static void     ng_ksocket_incoming(struct socket *so, void *arg, int waitflag);
 161 static int      ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
 162                         const char *s, int family);
 163
 164 /************************************************************************
 165                         STRUCT SOCKADDR PARSE TYPE
 166  ************************************************************************/
 167
 168 /* Get the length of the data portion of a generic struct sockaddr */
 169 static int
 170 ng_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 */
 180 static 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 */
 186 static const struct ng_parse_struct_field
 187     ng_parse_generic_sockaddr_type_fields[] = {
 188           { "len",      &ng_parse_uint8_type                    },
 189           { "family",   &ng_parse_uint8_type                    },
 190           { "data",     &ng_ksocket_generic_sockdata_type       },
 191           { NULL }
 192 };
 193 static const struct ng_parse_type ng_ksocket_generic_sockaddr_type = {
 194         &ng_parse_struct_type,
 195         &ng_parse_generic_sockaddr_type_fields
 196 };
 197
 198 /* Convert a struct sockaddr from ASCII to binary.  If its a protocol
 199    family that we specially handle, do that, otherwise defer to the
 200    generic parse type ng_ksocket_generic_sockaddr_type. */
 201 static int
 202 ng_ksocket_sockaddr_parse(const struct ng_parse_type *type,
 203         const char *s, int *off, const u_char *const start,
 204         u_char *const buf, int *buflen)
 205 {
 206         struct sockaddr *const sa = (struct sockaddr *)buf;
 207         enum ng_parse_token tok;
 208         char fambuf[32];
 209         int family, len;
 210         char *t;
 211
 212         /* If next token is a left curly brace, use generic parse type */
 213         if ((tok = ng_parse_get_token(s, off, &len)) == T_LBRACE) {
 214                 return (*ng_ksocket_generic_sockaddr_type.supertype->parse)
 215                     (&ng_ksocket_generic_sockaddr_type,
 216                     s, off, start, buf, buflen);
 217         }
 218
 219         /* Get socket address family followed by a slash */
 220         while (isspace(s[*off]))
 221                 (*off)++;
 222         if ((t = index(s + *off, '/')) == NULL)
 223                 return (EINVAL);
 224         if ((len = t - (s + *off)) > sizeof(fambuf) - 1)
 225                 return (EINVAL);
 226         strncpy(fambuf, s + *off, len);
 227         fambuf[len] = '\0';
 228         *off += len + 1;
 229         if ((family = ng_ksocket_parse(ng_ksocket_families, fambuf, 0)) == -1)
 230                 return (EINVAL);
 231
 232         /* Set family */
 233         if (*buflen < SADATA_OFFSET)
 234                 return (ERANGE);
 235         sa->sa_family = family;
 236
 237         /* Set family-specific data and length */
 238         switch (sa->sa_family) {
 239         case PF_LOCAL:          /* Get pathname */
 240             {
 241                 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
 242                 struct sockaddr_un *const sun = (struct sockaddr_un *)sa;
 243                 int toklen, pathlen;
 244                 char *path;
 245
 246                 if ((path = ng_get_string_token(s, off, &toklen)) == NULL)
 247                         return (EINVAL);
 248                 pathlen = strlen(path);
 249                 if (pathlen > SOCK_MAXADDRLEN) {
 250                         kfree(path, M_NETGRAPH);
 251                         return (E2BIG);
 252                 }
 253                 if (*buflen < pathoff + pathlen) {
 254                         kfree(path, M_NETGRAPH);
 255                         return (ERANGE);
 256                 }
 257                 *off += toklen;
 258                 bcopy(path, sun->sun_path, pathlen);
 259                 sun->sun_len = pathoff + pathlen;
 260                 kfree(path, M_NETGRAPH);
 261                 break;
 262             }
 263
 264         case PF_INET:           /* Get an IP address with optional port */
 265             {
 266                 struct sockaddr_in *const sin = (struct sockaddr_in *)sa;
 267                 int i;
 268
 269                 /* Parse this: <ipaddress>[:port] */
 270                 for (i = 0; i < 4; i++) {
 271                         u_long val;
 272                         char *eptr;
 273
 274                         val = strtoul(s + *off, &eptr, 10);
 275                         if (val > 0xff || eptr == s + *off)
 276                                 return (EINVAL);
 277                         *off += (eptr - (s + *off));
 278                         ((u_char *)&sin->sin_addr)[i] = (u_char)val;
 279                         if (i < 3) {
 280                                 if (s[*off] != '.')
 281                                         return (EINVAL);
 282                                 (*off)++;
 283                         } else if (s[*off] == ':') {
 284                                 (*off)++;
 285                                 val = strtoul(s + *off, &eptr, 10);
 286                                 if (val > 0xffff || eptr == s + *off)
 287                                         return (EINVAL);
 288                                 *off += (eptr - (s + *off));
 289                                 sin->sin_port = htons(val);
 290                         } else
 291                                 sin->sin_port = 0;
 292                 }
 293                 bzero(&sin->sin_zero, sizeof(sin->sin_zero));
 294                 sin->sin_len = sizeof(*sin);
 295                 break;
 296             }
 297
 298 #if 0
 299         case PF_INET6:
 300 #endif
 301
 302         default:
 303                 return (EINVAL);
 304         }
 305
 306         /* Done */
 307         *buflen = sa->sa_len;
 308         return (0);
 309 }
 310
 311 /* Convert a struct sockaddr from binary to ASCII */
 312 static int
 313 ng_ksocket_sockaddr_unparse(const struct ng_parse_type *type,
 314         const u_char *data, int *off, char *cbuf, int cbuflen)
 315 {
 316         const struct sockaddr *sa = (const struct sockaddr *)(data + *off);
 317         int slen = 0;
 318
 319         /* Output socket address, either in special or generic format */
 320         switch (sa->sa_family) {
 321         case PF_LOCAL:
 322             {
 323                 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
 324                 const struct sockaddr_un *sun = (const struct sockaddr_un *)sa;
 325                 const int pathlen = sun->sun_len - pathoff;
 326                 char pathbuf[SOCK_MAXADDRLEN + 1];
 327                 char *pathtoken;
 328
 329                 bcopy(sun->sun_path, pathbuf, pathlen);
 330                 pathbuf[pathlen] = '\0';
 331                 if ((pathtoken = ng_encode_string(pathbuf)) == NULL)
 332                         return (ENOMEM);
 333                 slen += ksnprintf(cbuf, cbuflen, "local/%s", pathtoken);
 334                 kfree(pathtoken, M_NETGRAPH);
 335                 if (slen >= cbuflen)
 336                         return (ERANGE);
 337                 *off += sun->sun_len;
 338                 return (0);
 339             }
 340
 341         case PF_INET:
 342             {
 343                 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
 344
 345                 slen += ksnprintf(cbuf, cbuflen, "inet/%d.%d.%d.%d",
 346                   ((const u_char *)&sin->sin_addr)[0],
 347                   ((const u_char *)&sin->sin_addr)[1],
 348                   ((const u_char *)&sin->sin_addr)[2],
 349                   ((const u_char *)&sin->sin_addr)[3]);
 350                 if (sin->sin_port != 0) {
 351                         slen += ksnprintf(cbuf + strlen(cbuf),
 352                             cbuflen - strlen(cbuf), ":%d",
 353                             (u_int)ntohs(sin->sin_port));
 354                 }
 355                 if (slen >= cbuflen)
 356                         return (ERANGE);
 357                 *off += sizeof(*sin);
 358                 return(0);
 359             }
 360
 361 #if 0
 362         case PF_INET6:
 363 #endif
 364
 365         default:
 366                 return (*ng_ksocket_generic_sockaddr_type.supertype->unparse)
 367                     (&ng_ksocket_generic_sockaddr_type,
 368                     data, off, cbuf, cbuflen);
 369         }
 370 }
 371
 372 /* Parse type for struct sockaddr */
 373 static const struct ng_parse_type ng_ksocket_sockaddr_type = {
 374         NULL,
 375         NULL,
 376         NULL,
 377         &ng_ksocket_sockaddr_parse,
 378         &ng_ksocket_sockaddr_unparse,
 379         NULL            /* no such thing as a default struct sockaddr */
 380 };
 381
 382 /************************************************************************
 383                 STRUCT NG_KSOCKET_SOCKOPT PARSE TYPE
 384  ************************************************************************/
 385
 386 /* Get length of the struct ng_ksocket_sockopt value field, which is the
 387    just the excess of the message argument portion over the length of
 388    the struct ng_ksocket_sockopt. */
 389 static int
 390 ng_parse_sockoptval_getLength(const struct ng_parse_type *type,
 391         const u_char *start, const u_char *buf)
 392 {
 393         static const int offset = OFFSETOF(struct ng_ksocket_sockopt, value);
 394         const struct ng_ksocket_sockopt *sopt;
 395         const struct ng_mesg *msg;
 396
 397         sopt = (const struct ng_ksocket_sockopt *)(buf - offset);
 398         msg = (const struct ng_mesg *)((const u_char *)sopt - sizeof(*msg));
 399         return msg->header.arglen - sizeof(*sopt);
 400 }
 401
 402 /* Parse type for the option value part of a struct ng_ksocket_sockopt
 403    XXX Eventually, we should handle the different socket options specially.
 404    XXX This would avoid byte order problems, eg an integer value of 1 is
 405    XXX going to be "[1]" for little endian or "[3=1]" for big endian. */
 406 static const struct ng_parse_type ng_ksocket_sockoptval_type = {
 407         &ng_parse_bytearray_type,
 408         &ng_parse_sockoptval_getLength
 409 };
 410
 411 /* Parse type for struct ng_ksocket_sockopt */
 412 static const struct ng_parse_struct_field ng_ksocket_sockopt_type_fields[]
 413         = NG_KSOCKET_SOCKOPT_INFO(&ng_ksocket_sockoptval_type);
 414 static const struct ng_parse_type ng_ksocket_sockopt_type = {
 415         &ng_parse_struct_type,
 416         &ng_ksocket_sockopt_type_fields
 417 };
 418
 419 /* Parse type for struct ng_ksocket_accept */
 420 static const struct ng_parse_struct_field ng_ksocket_accept_type_fields[]
 421         = NGM_KSOCKET_ACCEPT_INFO;
 422 static const struct ng_parse_type ng_ksocket_accept_type = {
 423         &ng_parse_struct_type,
 424         &ng_ksocket_accept_type_fields
 425 };
 426
 427 /* List of commands and how to convert arguments to/from ASCII */
 428 static const struct ng_cmdlist ng_ksocket_cmds[] = {
 429         {
 430           NGM_KSOCKET_COOKIE,
 431           NGM_KSOCKET_BIND,
 432           "bind",
 433           &ng_ksocket_sockaddr_type,
 434           NULL
 435         },
 436         {
 437           NGM_KSOCKET_COOKIE,
 438           NGM_KSOCKET_LISTEN,
 439           "listen",
 440           &ng_parse_int32_type,
 441           NULL
 442         },
 443         {
 444           NGM_KSOCKET_COOKIE,
 445           NGM_KSOCKET_ACCEPT,
 446           "accept",
 447           NULL,
 448           &ng_ksocket_accept_type
 449         },
 450         {
 451           NGM_KSOCKET_COOKIE,
 452           NGM_KSOCKET_CONNECT,
 453           "connect",
 454           &ng_ksocket_sockaddr_type,
 455           &ng_parse_int32_type
 456         },
 457         {
 458           NGM_KSOCKET_COOKIE,
 459           NGM_KSOCKET_GETNAME,
 460           "getname",
 461           NULL,
 462           &ng_ksocket_sockaddr_type
 463         },
 464         {
 465           NGM_KSOCKET_COOKIE,
 466           NGM_KSOCKET_GETPEERNAME,
 467           "getpeername",
 468           NULL,
 469           &ng_ksocket_sockaddr_type
 470         },
 471         {
 472           NGM_KSOCKET_COOKIE,
 473           NGM_KSOCKET_SETOPT,
 474           "setopt",
 475           &ng_ksocket_sockopt_type,
 476           NULL
 477         },
 478         {
 479           NGM_KSOCKET_COOKIE,
 480           NGM_KSOCKET_GETOPT,
 481           "getopt",
 482           &ng_ksocket_sockopt_type,
 483           &ng_ksocket_sockopt_type
 484         },
 485
 486         /* Internal commands */
 487         {
 488           NGM_KSOCKET_INTERNAL_COOKIE,
 489           NGM_KSOCKET_INTERNAL_UPCALL,
 490           "upcall",
 491           NULL,
 492           NULL
 493         },
 494         { 0 }
 495 };
 496
 497 /* Node type descriptor */
 498 static struct ng_type ng_ksocket_typestruct = {
 499         NG_VERSION,
 500         NG_KSOCKET_NODE_TYPE,
 501         NULL,
 502         ng_ksocket_constructor,
 503         ng_ksocket_rcvmsg,
 504         ng_ksocket_rmnode,
 505         ng_ksocket_newhook,
 506         NULL,
 507         NULL,
 508         ng_ksocket_rcvdata,
 509         ng_ksocket_rcvdata,
 510         ng_ksocket_disconnect,
 511         ng_ksocket_cmds
 512 };
 513 NETGRAPH_INIT(ksocket, &ng_ksocket_typestruct);
 514
 515 #define ERROUT(x)       do { error = (x); goto done; } while (0)
 516
 517 /************************************************************************
 518                         NETGRAPH NODE STUFF
 519  ************************************************************************/
 520
 521 /*
 522  * Node type constructor
 523  */
 524 static int
 525 ng_ksocket_constructor(node_p *nodep)
 526 {
 527         priv_p priv;
 528         int error;
 529
 530         /* Allocate private structure */
 531         priv = kmalloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
 532         if (priv == NULL)
 533                 return (ENOMEM);
 534
 535         /* Call generic node constructor */
 536         if ((error = ng_make_node_common(&ng_ksocket_typestruct, nodep))) {
 537                 kfree(priv, M_NETGRAPH);
 538                 return (error);
 539         }
 540         (*nodep)->private = priv;
 541         priv->node = *nodep;
 542         LIST_INIT(&priv->embryos);
 543
 544         /* Done */
 545         return (0);
 546 }
 547
 548 /*
 549  * Give our OK for a hook to be added. The hook name is of the
 550  * form "<family>/<type>/<proto>" where the three components may
 551  * be decimal numbers or else aliases from the above lists.
 552  *
 553  * Connecting a hook amounts to opening the socket.  Disconnecting
 554  * the hook closes the socket and destroys the node as well.
 555  */
 556 static int
 557 ng_ksocket_newhook(node_p node, hook_p hook, const char *name0)
 558 {
 559         struct thread *td = curthread->td_proc ? curthread : &thread0;  /* XXX broken */
 560         const priv_p priv = node->private;
 561         struct ng_mesg *msg;
 562         char *s1, *s2, name[NG_HOOKSIZ];
 563         int family, type, protocol, error;
 564
 565         /* Check if we're already connected */
 566         if (priv->hook != NULL)
 567                 return (EISCONN);
 568
 569         if (priv->flags & KSF_CLONED) {
 570                 if (priv->flags & KSF_EMBRYONIC) {
 571                         /* Remove ourselves from our parent's embryo list */
 572                         LIST_REMOVE(priv, siblings);
 573                         priv->flags &= ~KSF_EMBRYONIC;
 574                 }
 575         } else {
 576                 /* Extract family, type, and protocol from hook name */
 577                 ksnprintf(name, sizeof(name), "%s", name0);
 578                 s1 = name;
 579                 if ((s2 = index(s1, '/')) == NULL)
 580                         return (EINVAL);
 581                 *s2++ = '\0';
 582                 family = ng_ksocket_parse(ng_ksocket_families, s1, 0);
 583                 if (family == -1)
 584                         return (EINVAL);
 585                 s1 = s2;
 586                 if ((s2 = index(s1, '/')) == NULL)
 587                         return (EINVAL);
 588                 *s2++ = '\0';
 589                 type = ng_ksocket_parse(ng_ksocket_types, s1, 0);
 590                 if (type == -1)
 591                         return (EINVAL);
 592                 s1 = s2;
 593                 protocol = ng_ksocket_parse(ng_ksocket_protos, s1, family);
 594                 if (protocol == -1)
 595                         return (EINVAL);
 596
 597                 /* Create the socket */
 598                 error = socreate(family, &priv->so, type, protocol, td);
 599                 if (error != 0)
 600                         return (error);
 601
 602                 /* XXX call soreserve() ? */
 603
 604                 /* Add our hook for incoming data and other events */
 605                 priv->so->so_upcallarg = (caddr_t)node;
 606                 priv->so->so_upcall = ng_ksocket_incoming;
 607                 atomic_set_int(&priv->so->so_rcv.ssb_flags, SSB_UPCALL);
 608                 atomic_set_int(&priv->so->so_snd.ssb_flags, SSB_UPCALL);
 609         }
 610
 611         /* OK */
 612         priv->hook = hook;
 613
 614         /*
 615          * On a cloned socket we may have already received one or more
 616          * upcalls which we couldn't handle without a hook.  Handle
 617          * those now.  We cannot call the upcall function directly
 618          * from here, because until this function has returned our
 619          * hook isn't connected.  So we queue a message to ourselves
 620          * which will cause the upcall function to be called a bit
 621          * later.
 622          */
 623         if (priv->flags & KSF_CLONED) {
 624                 NG_MKMESSAGE(msg, NGM_KSOCKET_INTERNAL_COOKIE,
 625                     NGM_KSOCKET_INTERNAL_UPCALL, 0, M_NOWAIT);
 626                 if (msg != NULL)
 627                         ng_queue_msg(node, msg, ".:");
 628         }
 629
 630         return (0);
 631 }
 632
 633 /*
 634  * Receive a control message
 635  */
 636 static int
 637 ng_ksocket_rcvmsg(node_p node, struct ng_mesg *msg,
 638               const char *raddr, struct ng_mesg **rptr)
 639 {
 640         struct thread *td = curthread->td_proc ? curthread : &thread0;  /* XXX broken */
 641         const priv_p priv = node->private;
 642         struct socket *const so = priv->so;
 643         struct ng_mesg *resp = NULL;
 644         int error = 0;
 645
 646         switch (msg->header.typecookie) {
 647         case NGM_KSOCKET_COOKIE:
 648                 switch (msg->header.cmd) {
 649                 case NGM_KSOCKET_BIND:
 650                     {
 651                         struct sockaddr *const sa
 652                             = (struct sockaddr *)msg->data;
 653
 654                         /* Sanity check */
 655                         if (msg->header.arglen < SADATA_OFFSET
 656                             || msg->header.arglen < sa->sa_len)
 657                                 ERROUT(EINVAL);
 658                         if (so == NULL)
 659                                 ERROUT(ENXIO);
 660
 661                         /* Bind */
 662                         error = sobind(so, sa, td);
 663                         break;
 664                     }
 665                 case NGM_KSOCKET_LISTEN:
 666                     {
 667                         /* Sanity check */
 668                         if (msg->header.arglen != sizeof(int32_t))
 669                                 ERROUT(EINVAL);
 670                         if (so == NULL)
 671                                 ERROUT(ENXIO);
 672
 673                         /* Listen */
 674                         error = solisten(so, *((int32_t *)msg->data), td);
 675                         break;
 676                     }
 677
 678                 case NGM_KSOCKET_ACCEPT:
 679                     {
 680                         /* Sanity check */
 681                         if (msg->header.arglen != 0)
 682                                 ERROUT(EINVAL);
 683                         if (so == NULL)
 684                                 ERROUT(ENXIO);
 685
 686                         /* Make sure the socket is capable of accepting */
 687                         if (!(so->so_options & SO_ACCEPTCONN))
 688                                 ERROUT(EINVAL);
 689                         if (priv->flags & KSF_ACCEPTING)
 690                                 ERROUT(EALREADY);
 691
 692                         error = ng_ksocket_check_accept(priv);
 693                         if (error != 0 && error != EWOULDBLOCK)
 694                                 ERROUT(error);
 695
 696                         /*
 697                          * If a connection is already complete, take it.
 698                          * Otherwise let the upcall function deal with
 699                          * the connection when it comes in.
 700                          */
 701                         priv->response_token = msg->header.token;
 702                         strcpy(priv->response_addr, raddr);
 703                         if (error == 0) {
 704                                 ng_ksocket_finish_accept(priv,
 705                                     rptr != NULL ? &resp : NULL);
 706                         } else
 707                                 priv->flags |= KSF_ACCEPTING;
 708                         break;
 709                     }
 710
 711                 case NGM_KSOCKET_CONNECT:
 712                     {
 713                         struct sockaddr *const sa
 714                             = (struct sockaddr *)msg->data;
 715
 716                         /* Sanity check */
 717                         if (msg->header.arglen < SADATA_OFFSET
 718                             || msg->header.arglen < sa->sa_len)
 719                                 ERROUT(EINVAL);
 720                         if (so == NULL)
 721                                 ERROUT(ENXIO);
 722
 723                         /* Do connect */
 724                         if ((so->so_state & SS_ISCONNECTING) != 0)
 725                                 ERROUT(EALREADY);
 726                         if ((error = soconnect(so, sa, td, TRUE)) != 0) {
 727                                 soclrstate(so, SS_ISCONNECTING);
 728                                 ERROUT(error);
 729                         }
 730                         if ((so->so_state & SS_ISCONNECTING) != 0) {
 731                                 /* We will notify the sender when we connect */
 732                                 priv->response_token = msg->header.token;
 733                                 strcpy(priv->response_addr, raddr);
 734                                 priv->flags |= KSF_CONNECTING;
 735                                 ERROUT(EINPROGRESS);
 736                         }
 737                         break;
 738                     }
 739
 740                 case NGM_KSOCKET_GETNAME:
 741                 case NGM_KSOCKET_GETPEERNAME:
 742                     {
 743                         struct sockaddr *sa = NULL;
 744                         int len;
 745
 746                         /* Sanity check */
 747                         if (msg->header.arglen != 0)
 748                                 ERROUT(EINVAL);
 749                         if (so == NULL)
 750                                 ERROUT(ENXIO);
 751
 752                         /* Get function */
 753                         if (msg->header.cmd == NGM_KSOCKET_GETPEERNAME) {
 754                                 if ((so->so_state
 755                                     & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0)
 756                                         ERROUT(ENOTCONN);
 757                                 error = so_pru_peeraddr(so, &sa);
 758                         } else
 759                                 error = so_pru_sockaddr(so, &sa);
 760
 761                         /* Get local or peer address */
 762                         if (error != 0)
 763                                 goto bail;
 764                         len = (sa == NULL) ? 0 : sa->sa_len;
 765
 766                         /* Send it back in a response */
 767                         NG_MKRESPONSE(resp, msg, len, M_NOWAIT);
 768                         if (resp == NULL) {
 769                                 error = ENOMEM;
 770                                 goto bail;
 771                         }
 772                         bcopy(sa, resp->data, len);
 773
 774                 bail:
 775                         /* Cleanup */
 776                         if (sa != NULL)
 777                                 kfree(sa, M_SONAME);
 778                         break;
 779                     }
 780
 781                 case NGM_KSOCKET_GETOPT:
 782                     {
 783                         struct ng_ksocket_sockopt *ksopt =
 784                             (struct ng_ksocket_sockopt *)msg->data;
 785                         struct sockopt sopt;
 786
 787                         /* Sanity check */
 788                         if (msg->header.arglen != sizeof(*ksopt))
 789                                 ERROUT(EINVAL);
 790                         if (so == NULL)
 791                                 ERROUT(ENXIO);
 792
 793                         /* Get response with room for option value */
 794                         NG_MKRESPONSE(resp, msg, sizeof(*ksopt)
 795                             + NG_KSOCKET_MAX_OPTLEN, M_NOWAIT);
 796                         if (resp == NULL)
 797                                 ERROUT(ENOMEM);
 798
 799                         /* Get socket option, and put value in the response */
 800                         sopt.sopt_dir = SOPT_GET;
 801                         sopt.sopt_level = ksopt->level;
 802                         sopt.sopt_name = ksopt->name;
 803                         sopt.sopt_td = NULL;
 804                         sopt.sopt_valsize = NG_KSOCKET_MAX_OPTLEN;
 805                         ksopt = (struct ng_ksocket_sockopt *)resp->data;
 806                         sopt.sopt_val = ksopt->value;
 807                         if ((error = sogetopt(so, &sopt)) != 0) {
 808                                 kfree(resp, M_NETGRAPH);
 809                                 resp = NULL;
 810                                 break;
 811                         }
 812
 813                         /* Set actual value length */
 814                         resp->header.arglen = sizeof(*ksopt)
 815                             + sopt.sopt_valsize;
 816                         break;
 817                     }
 818
 819                 case NGM_KSOCKET_SETOPT:
 820                     {
 821                         struct ng_ksocket_sockopt *const ksopt =
 822                             (struct ng_ksocket_sockopt *)msg->data;
 823                         const int valsize = msg->header.arglen - sizeof(*ksopt);
 824                         struct sockopt sopt;
 825
 826                         /* Sanity check */
 827                         if (valsize < 0)
 828                                 ERROUT(EINVAL);
 829                         if (so == NULL)
 830                                 ERROUT(ENXIO);
 831
 832                         /* Set socket option */
 833                         sopt.sopt_dir = SOPT_SET;
 834                         sopt.sopt_level = ksopt->level;
 835                         sopt.sopt_name = ksopt->name;
 836                         sopt.sopt_val = ksopt->value;
 837                         sopt.sopt_valsize = valsize;
 838                         sopt.sopt_td = NULL;
 839                         error = sosetopt(so, &sopt);
 840                         break;
 841                     }
 842
 843                 default:
 844                         error = EINVAL;
 845                         break;
 846                 }
 847                 break;
 848         case NGM_KSOCKET_INTERNAL_COOKIE:
 849                 switch (msg->header.cmd) {
 850                 case NGM_KSOCKET_INTERNAL_UPCALL:
 851                         if (so == NULL)
 852                                 ERROUT(ENXIO);
 853                         (*priv->so->so_upcall)(so, so->so_upcallarg, M_NOWAIT);
 854                         break;
 855                 default:
 856                         error = EINVAL;
 857                         break;
 858                 }
 859                 break;
 860         default:
 861                 error = EINVAL;
 862                 break;
 863         }
 864         if (rptr)
 865                 *rptr = resp;
 866         else if (resp)
 867                 kfree(resp, M_NETGRAPH);
 868
 869 done:
 870         kfree(msg, M_NETGRAPH);
 871         return (error);
 872 }
 873
 874 /*
 875  * Receive incoming data on our hook.  Send it out the socket.
 876  */
 877 static int
 878 ng_ksocket_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
 879 {
 880         struct thread *td = curthread->td_proc ? curthread : &thread0;  /* XXX broken */
 881         const node_p node = hook->node;
 882         const priv_p priv = node->private;
 883         struct socket *const so = priv->so;
 884         struct sockaddr *sa = NULL;
 885         int error;
 886
 887         /* Avoid reentrantly sending on the socket */
 888         if ((priv->flags & KSF_SENDING) != 0) {
 889                 NG_FREE_DATA(m, meta);
 890                 return (EDEADLK);
 891         }
 892
 893         /* If any meta info, look for peer socket address */
 894         if (meta != NULL) {
 895                 struct meta_field_header *field;
 896
 897                 /* Look for peer socket address */
 898                 for (field = &meta->options[0];
 899                     (caddr_t)field < (caddr_t)meta + meta->used_len;
 900                     field = (struct meta_field_header *)
 901                       ((caddr_t)field + field->len)) {
 902                         if (field->cookie != NGM_KSOCKET_COOKIE
 903                             || field->type != NG_KSOCKET_META_SOCKADDR)
 904                                 continue;
 905                         sa = (struct sockaddr *)field->data;
 906                         break;
 907                 }
 908         }
 909
 910         /* Send packet */
 911         priv->flags |= KSF_SENDING;
 912         error = so_pru_sosend(so, sa, NULL, m, NULL, 0, td);
 913         priv->flags &= ~KSF_SENDING;
 914
 915         /* Clean up and exit */
 916         NG_FREE_META(meta);
 917         return (error);
 918 }
 919
 920 /*
 921  * Destroy node
 922  */
 923 static int
 924 ng_ksocket_rmnode(node_p node)
 925 {
 926         const priv_p priv = node->private;
 927         priv_p embryo;
 928
 929         /* Close our socket (if any) */
 930         if (priv->so != NULL) {
 931                 priv->so->so_upcall = NULL;
 932                 atomic_clear_int(&priv->so->so_rcv.ssb_flags, SSB_UPCALL);
 933                 atomic_clear_int(&priv->so->so_snd.ssb_flags, SSB_UPCALL);
 934                 soclose(priv->so, FNONBLOCK);
 935                 priv->so = NULL;
 936         }
 937
 938         /* If we are an embryo, take ourselves out of the parent's list */
 939         if (priv->flags & KSF_EMBRYONIC) {
 940                 LIST_REMOVE(priv, siblings);
 941                 priv->flags &= ~KSF_EMBRYONIC;
 942         }
 943
 944         /* Remove any embryonic children we have */
 945         while (!LIST_EMPTY(&priv->embryos)) {
 946                 embryo = LIST_FIRST(&priv->embryos);
 947                 ng_rmnode(embryo->node);
 948         }
 949
 950         /* Take down netgraph node */
 951         node->flags |= NG_INVALID;
 952         ng_cutlinks(node);
 953         ng_unname(node);
 954         bzero(priv, sizeof(*priv));
 955         kfree(priv, M_NETGRAPH);
 956         node->private = NULL;
 957         ng_unref(node);         /* let the node escape */
 958         return (0);
 959 }
 960
 961 /*
 962  * Hook disconnection
 963  */
 964 static int
 965 ng_ksocket_disconnect(hook_p hook)
 966 {
 967         KASSERT(hook->node->numhooks == 0,
 968             ("%s: numhooks=%d?", __func__, hook->node->numhooks));
 969         ng_rmnode(hook->node);
 970         return (0);
 971 }
 972
 973 /************************************************************************
 974                         HELPER STUFF
 975  ************************************************************************/
 976
 977 /*
 978  * When incoming data is appended to the socket, we get notified here.
 979  * This is also called whenever a significant event occurs for the socket.
 980  */
 981 static void
 982 ng_ksocket_incoming(struct socket *so, void *arg, int waitflag)
 983 {
 984         const node_p node = arg;
 985         const priv_p priv = node->private;
 986         struct ng_mesg *response;
 987         int error;
 988
 989         crit_enter();
 990
 991         /* Sanity check */
 992         if ((node->flags & NG_INVALID) != 0) {
 993                 crit_exit();
 994                 return;
 995         }
 996         KASSERT(so == priv->so, ("%s: wrong socket", __func__));
 997
 998         /* Check whether a pending connect operation has completed */
 999         if (priv->flags & KSF_CONNECTING) {
1000                 if ((error = so->so_error) != 0) {
1001                         so->so_error = 0;
1002                         soclrstate(so, SS_ISCONNECTING);
1003                 }
1004                 if (!(so->so_state & SS_ISCONNECTING)) {
1005                         NG_MKMESSAGE(response, NGM_KSOCKET_COOKIE,
1006                             NGM_KSOCKET_CONNECT, sizeof(int32_t), waitflag);
1007                         if (response != NULL) {
1008                                 response->header.flags |= NGF_RESP;
1009                                 response->header.token = priv->response_token;
1010                                 *(int32_t *)response->data = error;
1011                                 /*
1012                                  * XXX We use ng_queue_msg here because we are
1013                                  * being called from deep in the bowels of the TCP
1014                                  * stack.  Is this right, or should we let the
1015                                  * receiver of the message worry about that?
1016                                  */
1017                                 ng_queue_msg(node, response,
1018                                     priv->response_addr);
1019                         }
1020                         priv->flags &= ~KSF_CONNECTING;
1021                 }
1022         }
1023
1024         /* Check whether a pending accept operation has completed */
1025         if (priv->flags & KSF_ACCEPTING) {
1026                 error = ng_ksocket_check_accept(priv);
1027                 if (error != EWOULDBLOCK)
1028                         priv->flags &= ~KSF_ACCEPTING;
1029                 if (error == 0)
1030                         ng_ksocket_finish_accept(priv, NULL);
1031         }
1032
1033         /*
1034          * If we don't have a hook, we must handle data events later.  When
1035          * the hook gets created and is connected, this upcall function
1036          * will be called again.
1037          */
1038         if (priv->hook == NULL) {
1039                 crit_exit();
1040                 return;
1041         }
1042
1043         /* Read and forward available mbuf's */
1044         while (1) {
1045                 struct sockaddr *sa = NULL;
1046                 struct sockbuf sio;
1047                 meta_p meta = NULL;
1048                 struct mbuf *n;
1049                 int flags;
1050
1051                 sbinit(&sio, 1000000000);
1052                 flags = MSG_DONTWAIT;
1053
1054                 /* Try to get next packet from socket */
1055                 error = so_pru_soreceive(so,
1056                                 ((so->so_state & SS_ISCONNECTED) ? NULL : &sa),
1057                                 NULL, &sio, NULL, &flags);
1058                 if (error)
1059                         break;
1060
1061                 /* See if we got anything */
1062                 if (sio.sb_mb == NULL) {
1063                         if (sa != NULL)
1064                                 kfree(sa, M_SONAME);
1065                         break;
1066                 }
1067
1068                 /* Don't trust the various socket layers to get the
1069                    packet header and length correct (eg. kern/15175) */
1070                 sio.sb_mb->m_pkthdr.len = 0;
1071                 for (n = sio.sb_mb; n != NULL; n = n->m_next)
1072                         sio.sb_mb->m_pkthdr.len += n->m_len;
1073
1074                 /* Put peer's socket address (if any) into a meta info blob */
1075                 if (sa != NULL) {
1076                         struct meta_field_header *mhead;
1077                         u_int len;
1078
1079                         len = sizeof(*meta) + sizeof(*mhead) + sa->sa_len;
1080                         meta = kmalloc(len, M_NETGRAPH, M_NOWAIT);
1081                         if (meta == NULL) {
1082                                 kfree(sa, M_SONAME);
1083                                 goto sendit;
1084                         }
1085                         mhead = &meta->options[0];
1086                         bzero(meta, sizeof(*meta));
1087                         bzero(mhead, sizeof(*mhead));
1088                         meta->allocated_len = len;
1089                         meta->used_len = len;
1090                         mhead->cookie = NGM_KSOCKET_COOKIE;
1091                         mhead->type = NG_KSOCKET_META_SOCKADDR;
1092                         mhead->len = sizeof(*mhead) + sa->sa_len;
1093                         bcopy(sa, mhead->data, sa->sa_len);
1094                         kfree(sa, M_SONAME);
1095                 }
1096 sendit:         /* Forward data with optional peer sockaddr as meta info */
1097                 NG_SEND_DATA(error, priv->hook, sio.sb_mb, meta);
1098         }
1099
1100         /*
1101          * If the peer has closed the connection, forward a 0-length mbuf
1102          * to indicate end-of-file.
1103          */
1104         if (so->so_state & SS_CANTRCVMORE && !(priv->flags & KSF_EOFSEEN)) {
1105                 struct mbuf *m;
1106
1107                 MGETHDR(m, waitflag, MT_DATA);
1108                 if (m != NULL) {
1109                         m->m_len = m->m_pkthdr.len = 0;
1110                         NG_SEND_DATA_ONLY(error, priv->hook, m);
1111                 }
1112                 priv->flags |= KSF_EOFSEEN;
1113         }
1114
1115         crit_exit();
1116 }
1117
1118 /*
1119  * Check for a completed incoming connection and return 0 if one is found.
1120  * Otherwise return the appropriate error code.
1121  */
1122 static int
1123 ng_ksocket_check_accept(priv_p priv)
1124 {
1125         struct socket *const head = priv->so;
1126         int error;
1127
1128         lwkt_gettoken(&head->so_rcv.ssb_token);
1129         if ((error = head->so_error) != 0) {
1130                 head->so_error = 0;
1131                 lwkt_reltoken(&head->so_rcv.ssb_token);
1132                 return error;
1133         }
1134         if (TAILQ_EMPTY(&head->so_comp)) {
1135                 if (head->so_state & SS_CANTRCVMORE)
1136                         error = ECONNABORTED;
1137                 else
1138                         error = EWOULDBLOCK;
1139         }
1140         lwkt_reltoken(&head->so_rcv.ssb_token);
1141         return error;
1142 }
1143
1144 /*
1145  * Handle the first completed incoming connection, assumed to be already
1146  * on the socket's so_comp queue.
1147  */
1148 static void
1149 ng_ksocket_finish_accept(priv_p priv, struct ng_mesg **rptr)
1150 {
1151         struct socket *const head = priv->so;
1152         struct socket *so;
1153         struct sockaddr *sa = NULL;
1154         struct ng_mesg *resp;
1155         struct ng_ksocket_accept *resp_data;
1156         node_p node2;
1157         priv_p priv2;
1158         int len;
1159
1160         lwkt_getpooltoken(head);
1161         so = TAILQ_FIRST(&head->so_comp);
1162         if (so == NULL) {       /* Should never happen */
1163                 lwkt_relpooltoken(head);
1164                 return;
1165         }
1166         TAILQ_REMOVE(&head->so_comp, so, so_list);
1167         head->so_qlen--;
1168         soclrstate(so, SS_COMP);
1169         so->so_head = NULL;
1170         soreference(so);
1171
1172         lwkt_relpooltoken(head);
1173
1174         /* XXX KNOTE(&head->so_rcv.ssb_sel.si_note, 0); */
1175
1176         soaccept(so, &sa);
1177
1178         len = OFFSETOF(struct ng_ksocket_accept, addr);
1179         if (sa != NULL)
1180                 len += sa->sa_len;
1181
1182         NG_MKMESSAGE(resp, NGM_KSOCKET_COOKIE, NGM_KSOCKET_ACCEPT, len,
1183             M_NOWAIT);
1184         if (resp == NULL) {
1185                 soclose(so, FNONBLOCK);
1186                 goto out;
1187         }
1188         resp->header.flags |= NGF_RESP;
1189         resp->header.token = priv->response_token;
1190
1191         /* Clone a ksocket node to wrap the new socket */
1192         if (ng_ksocket_constructor(&node2) != 0) {
1193                 kfree(resp, M_NETGRAPH);
1194                 soclose(so, FNONBLOCK);
1195                 goto out;
1196         }
1197         priv2 = (priv_p)node2->private;
1198         priv2->so = so;
1199         priv2->flags |= KSF_CLONED | KSF_EMBRYONIC;
1200
1201         /*
1202          * Insert the cloned node into a list of embryonic children
1203          * on the parent node.  When a hook is created on the cloned
1204          * node it will be removed from this list.  When the parent
1205          * is destroyed it will destroy any embryonic children it has.
1206          */
1207         LIST_INSERT_HEAD(&priv->embryos, priv2, siblings);
1208
1209         so->so_upcallarg = (caddr_t)node2;
1210         so->so_upcall = ng_ksocket_incoming;
1211         atomic_set_int(&so->so_rcv.ssb_flags, SSB_UPCALL);
1212         atomic_set_int(&so->so_snd.ssb_flags, SSB_UPCALL);
1213
1214         /* Fill in the response data and send it or return it to the caller */
1215         resp_data = (struct ng_ksocket_accept *)resp->data;
1216         resp_data->nodeid = node2->ID;
1217         if (sa != NULL)
1218                 bcopy(sa, &resp_data->addr, sa->sa_len);
1219         if (rptr != NULL)
1220                 *rptr = resp;
1221         else
1222                 ng_queue_msg(priv->node, resp, priv->response_addr);
1223
1224 out:
1225         if (sa != NULL)
1226                 kfree(sa, M_SONAME);
1227 }
1228
1229 /*
1230  * Parse out either an integer value or an alias.
1231  */
1232 static int
1233 ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
1234         const char *s, int family)
1235 {
1236         int k, val;
1237         char *eptr;
1238
1239         /* Try aliases */
1240         for (k = 0; aliases[k].name != NULL; k++) {
1241                 if (strcmp(s, aliases[k].name) == 0
1242                     && aliases[k].family == family)
1243                         return aliases[k].value;
1244         }
1245
1246         /* Try parsing as a number */
1247         val = (int)strtoul(s, &eptr, 10);
1248         if (val < 0 || *eptr != '\0')
1249                 return (-1);
1250         return (val);
1251 }
1252