The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_ksocket.c

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    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: releng/5.1/sys/netgraph/ng_ksocket.c 114182 2003-04-28 22:07:40Z archie $
   40  * $Whistle: ng_ksocket.c,v 1.1 1999/11/16 20:04:40 archie Exp $
   41  */
   42 
   43 /*
   44  * Kernel socket node type.  This node type is basically a kernel-mode
   45  * version of a socket... kindof like the reverse of the socket node type.
   46  */
   47 
   48 #include <sys/param.h>
   49 #include <sys/systm.h>
   50 #include <sys/kernel.h>
   51 #include <sys/mbuf.h>
   52 #include <sys/proc.h>
   53 #include <sys/malloc.h>
   54 #include <sys/ctype.h>
   55 #include <sys/protosw.h>
   56 #include <sys/errno.h>
   57 #include <sys/socket.h>
   58 #include <sys/socketvar.h>
   59 #include <sys/uio.h>
   60 #include <sys/un.h>
   61 
   62 #include <netgraph/ng_message.h>
   63 #include <netgraph/netgraph.h>
   64 #include <netgraph/ng_parse.h>
   65 #include <netgraph/ng_ksocket.h>
   66 
   67 #include <netinet/in.h>
   68 #include <netatalk/at.h>
   69 
   70 #ifdef NG_SEPARATE_MALLOC
   71 MALLOC_DEFINE(M_NETGRAPH_KSOCKET, "netgraph_ksock", "netgraph ksock node ");
   72 #else
   73 #define M_NETGRAPH_KSOCKET M_NETGRAPH
   74 #endif
   75 
   76 #define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0))
   77 #define SADATA_OFFSET   (OFFSETOF(struct sockaddr, sa_data))
   78 
   79 /* Node private data */
   80 struct ng_ksocket_private {
   81         node_p          node;
   82         hook_p          hook;
   83         struct socket   *so;
   84         LIST_HEAD(, ng_ksocket_private) embryos;
   85         LIST_ENTRY(ng_ksocket_private)  siblings;
   86         u_int32_t       flags;
   87         u_int32_t       response_token;
   88         ng_ID_t         response_addr;
   89 };
   90 typedef struct ng_ksocket_private *priv_p;
   91 
   92 /* Flags for priv_p */
   93 #define KSF_CONNECTING  0x00000001      /* Waiting for connection complete */
   94 #define KSF_ACCEPTING   0x00000002      /* Waiting for accept complete */
   95 #define KSF_EOFSEEN     0x00000004      /* Have sent 0-length EOF mbuf */
   96 #define KSF_CLONED      0x00000008      /* Cloned from an accepting socket */
   97 #define KSF_EMBRYONIC   0x00000010      /* Cloned node with no hooks yet */
   98 #define KSF_SENDING     0x00000020      /* Sending on socket */
   99 
  100 /* Netgraph node methods */
  101 static ng_constructor_t ng_ksocket_constructor;
  102 static ng_rcvmsg_t      ng_ksocket_rcvmsg;
  103 static ng_shutdown_t    ng_ksocket_shutdown;
  104 static ng_newhook_t     ng_ksocket_newhook;
  105 static ng_rcvdata_t     ng_ksocket_rcvdata;
  106 static ng_connect_t     ng_ksocket_connect;
  107 static ng_disconnect_t  ng_ksocket_disconnect;
  108 
  109 /* Alias structure */
  110 struct ng_ksocket_alias {
  111         const char      *name;
  112         const int       value;
  113         const int       family;
  114 };
  115 
  116 /* Protocol family aliases */
  117 static const struct ng_ksocket_alias ng_ksocket_families[] = {
  118         { "local",      PF_LOCAL        },
  119         { "inet",       PF_INET         },
  120         { "inet6",      PF_INET6        },
  121         { "atalk",      PF_APPLETALK    },
  122         { "ipx",        PF_IPX          },
  123         { "atm",        PF_ATM          },
  124         { NULL,         -1              },
  125 };
  126 
  127 /* Socket type aliases */
  128 static const struct ng_ksocket_alias ng_ksocket_types[] = {
  129         { "stream",     SOCK_STREAM     },
  130         { "dgram",      SOCK_DGRAM      },
  131         { "raw",        SOCK_RAW        },
  132         { "rdm",        SOCK_RDM        },
  133         { "seqpacket",  SOCK_SEQPACKET  },
  134         { NULL,         -1              },
  135 };
  136 
  137 /* Protocol aliases */
  138 static const struct ng_ksocket_alias ng_ksocket_protos[] = {
  139         { "ip",         IPPROTO_IP,             PF_INET         },
  140         { "raw",        IPPROTO_RAW,            PF_INET         },
  141         { "icmp",       IPPROTO_ICMP,           PF_INET         },
  142         { "igmp",       IPPROTO_IGMP,           PF_INET         },
  143         { "tcp",        IPPROTO_TCP,            PF_INET         },
  144         { "udp",        IPPROTO_UDP,            PF_INET         },
  145         { "gre",        IPPROTO_GRE,            PF_INET         },
  146         { "esp",        IPPROTO_ESP,            PF_INET         },
  147         { "ah",         IPPROTO_AH,             PF_INET         },
  148         { "swipe",      IPPROTO_SWIPE,          PF_INET         },
  149         { "encap",      IPPROTO_ENCAP,          PF_INET         },
  150         { "divert",     IPPROTO_DIVERT,         PF_INET         },
  151         { "ddp",        ATPROTO_DDP,            PF_APPLETALK    },
  152         { "aarp",       ATPROTO_AARP,           PF_APPLETALK    },
  153         { NULL,         -1                                      },
  154 };
  155 
  156 /* Helper functions */
  157 static int      ng_ksocket_check_accept(priv_p);
  158 static void     ng_ksocket_finish_accept(priv_p);
  159 static void     ng_ksocket_incoming(struct socket *so, void *arg, int waitflag);
  160 static int      ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
  161                         const char *s, int family);
  162 static void     ng_ksocket_incoming2(node_p node, hook_p hook,
  163                         void *arg1, int waitflag);
  164 
  165 /************************************************************************
  166                         STRUCT SOCKADDR PARSE TYPE
  167  ************************************************************************/
  168 
  169 /* Get the length of the data portion of a generic struct sockaddr */
  170 static int
  171 ng_parse_generic_sockdata_getLength(const struct ng_parse_type *type,
  172         const u_char *start, const u_char *buf)
  173 {
  174         const struct sockaddr *sa;
  175 
  176         sa = (const struct sockaddr *)(buf - SADATA_OFFSET);
  177         return (sa->sa_len < SADATA_OFFSET) ? 0 : sa->sa_len - SADATA_OFFSET;
  178 }
  179 
  180 /* Type for the variable length data portion of a generic struct sockaddr */
  181 static const struct ng_parse_type ng_ksocket_generic_sockdata_type = {
  182         &ng_parse_bytearray_type,
  183         &ng_parse_generic_sockdata_getLength
  184 };
  185 
  186 /* Type for a generic struct sockaddr */
  187 static const struct ng_parse_struct_field
  188     ng_parse_generic_sockaddr_type_fields[] = {
  189           { "len",      &ng_parse_uint8_type                    },
  190           { "family",   &ng_parse_uint8_type                    },
  191           { "data",     &ng_ksocket_generic_sockdata_type       },
  192           { NULL }
  193 };
  194 static const struct ng_parse_type ng_ksocket_generic_sockaddr_type = {
  195         &ng_parse_struct_type,
  196         &ng_parse_generic_sockaddr_type_fields
  197 };
  198 
  199 /* Convert a struct sockaddr from ASCII to binary.  If its a protocol
  200    family that we specially handle, do that, otherwise defer to the
  201    generic parse type ng_ksocket_generic_sockaddr_type. */
  202 static int
  203 ng_ksocket_sockaddr_parse(const struct ng_parse_type *type,
  204         const char *s, int *off, const u_char *const start,
  205         u_char *const buf, int *buflen)
  206 {
  207         struct sockaddr *const sa = (struct sockaddr *)buf;
  208         enum ng_parse_token tok;
  209         char fambuf[32];
  210         int family, len;
  211         char *t;
  212 
  213         /* If next token is a left curly brace, use generic parse type */
  214         if ((tok = ng_parse_get_token(s, off, &len)) == T_LBRACE) {
  215                 return (*ng_ksocket_generic_sockaddr_type.supertype->parse)
  216                     (&ng_ksocket_generic_sockaddr_type,
  217                     s, off, start, buf, buflen);
  218         }
  219 
  220         /* Get socket address family followed by a slash */
  221         while (isspace(s[*off]))
  222                 (*off)++;
  223         if ((t = index(s + *off, '/')) == NULL)
  224                 return (EINVAL);
  225         if ((len = t - (s + *off)) > sizeof(fambuf) - 1)
  226                 return (EINVAL);
  227         strncpy(fambuf, s + *off, len);
  228         fambuf[len] = '\0';
  229         *off += len + 1;
  230         if ((family = ng_ksocket_parse(ng_ksocket_families, fambuf, 0)) == -1)
  231                 return (EINVAL);
  232 
  233         /* Set family */
  234         if (*buflen < SADATA_OFFSET)
  235                 return (ERANGE);
  236         sa->sa_family = family;
  237 
  238         /* Set family-specific data and length */
  239         switch (sa->sa_family) {
  240         case PF_LOCAL:          /* Get pathname */
  241             {
  242                 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
  243                 struct sockaddr_un *const sun = (struct sockaddr_un *)sa;
  244                 int toklen, pathlen;
  245                 char *path;
  246 
  247                 if ((path = ng_get_string_token(s, off, &toklen, NULL)) == NULL)
  248                         return (EINVAL);
  249                 pathlen = strlen(path);
  250                 if (pathlen > SOCK_MAXADDRLEN) {
  251                         FREE(path, M_NETGRAPH_KSOCKET);
  252                         return (E2BIG);
  253                 }
  254                 if (*buflen < pathoff + pathlen) {
  255                         FREE(path, M_NETGRAPH_KSOCKET);
  256                         return (ERANGE);
  257                 }
  258                 *off += toklen;
  259                 bcopy(path, sun->sun_path, pathlen);
  260                 sun->sun_len = pathoff + pathlen;
  261                 FREE(path, M_NETGRAPH_KSOCKET);
  262                 break;
  263             }
  264 
  265         case PF_INET:           /* Get an IP address with optional port */
  266             {
  267                 struct sockaddr_in *const sin = (struct sockaddr_in *)sa;
  268                 int i;
  269 
  270                 /* Parse this: <ipaddress>[:port] */
  271                 for (i = 0; i < 4; i++) {
  272                         u_long val;
  273                         char *eptr;
  274 
  275                         val = strtoul(s + *off, &eptr, 10);
  276                         if (val > 0xff || eptr == s + *off)
  277                                 return (EINVAL);
  278                         *off += (eptr - (s + *off));
  279                         ((u_char *)&sin->sin_addr)[i] = (u_char)val;
  280                         if (i < 3) {
  281                                 if (s[*off] != '.')
  282                                         return (EINVAL);
  283                                 (*off)++;
  284                         } else if (s[*off] == ':') {
  285                                 (*off)++;
  286                                 val = strtoul(s + *off, &eptr, 10);
  287                                 if (val > 0xffff || eptr == s + *off)
  288                                         return (EINVAL);
  289                                 *off += (eptr - (s + *off));
  290                                 sin->sin_port = htons(val);
  291                         } else
  292                                 sin->sin_port = 0;
  293                 }
  294                 bzero(&sin->sin_zero, sizeof(sin->sin_zero));
  295                 sin->sin_len = sizeof(*sin);
  296                 break;
  297             }
  298 
  299 #if 0
  300         case PF_APPLETALK:      /* XXX implement these someday */
  301         case PF_INET6:
  302         case PF_IPX:
  303 #endif
  304 
  305         default:
  306                 return (EINVAL);
  307         }
  308 
  309         /* Done */
  310         *buflen = sa->sa_len;
  311         return (0);
  312 }
  313 
  314 /* Convert a struct sockaddr from binary to ASCII */
  315 static int
  316 ng_ksocket_sockaddr_unparse(const struct ng_parse_type *type,
  317         const u_char *data, int *off, char *cbuf, int cbuflen)
  318 {
  319         const struct sockaddr *sa = (const struct sockaddr *)(data + *off);
  320         int slen = 0;
  321 
  322         /* Output socket address, either in special or generic format */
  323         switch (sa->sa_family) {
  324         case PF_LOCAL:
  325             {
  326                 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
  327                 const struct sockaddr_un *sun = (const struct sockaddr_un *)sa;
  328                 const int pathlen = sun->sun_len - pathoff;
  329                 char pathbuf[SOCK_MAXADDRLEN + 1];
  330                 char *pathtoken;
  331 
  332                 bcopy(sun->sun_path, pathbuf, pathlen);
  333                 if ((pathtoken = ng_encode_string(pathbuf, pathlen)) == NULL)
  334                         return (ENOMEM);
  335                 slen += snprintf(cbuf, cbuflen, "local/%s", pathtoken);
  336                 FREE(pathtoken, M_NETGRAPH_KSOCKET);
  337                 if (slen >= cbuflen)
  338                         return (ERANGE);
  339                 *off += sun->sun_len;
  340                 return (0);
  341             }
  342 
  343         case PF_INET:
  344             {
  345                 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
  346 
  347                 slen += snprintf(cbuf, cbuflen, "inet/%d.%d.%d.%d",
  348                   ((const u_char *)&sin->sin_addr)[0],
  349                   ((const u_char *)&sin->sin_addr)[1],
  350                   ((const u_char *)&sin->sin_addr)[2],
  351                   ((const u_char *)&sin->sin_addr)[3]);
  352                 if (sin->sin_port != 0) {
  353                         slen += snprintf(cbuf + strlen(cbuf),
  354                             cbuflen - strlen(cbuf), ":%d",
  355                             (u_int)ntohs(sin->sin_port));
  356                 }
  357                 if (slen >= cbuflen)
  358                         return (ERANGE);
  359                 *off += sizeof(*sin);
  360                 return(0);
  361             }
  362 
  363 #if 0
  364         case PF_APPLETALK:      /* XXX implement these someday */
  365         case PF_INET6:
  366         case PF_IPX:
  367 #endif
  368 
  369         default:
  370                 return (*ng_ksocket_generic_sockaddr_type.supertype->unparse)
  371                     (&ng_ksocket_generic_sockaddr_type,
  372                     data, off, cbuf, cbuflen);
  373         }
  374 }
  375 
  376 /* Parse type for struct sockaddr */
  377 static const struct ng_parse_type ng_ksocket_sockaddr_type = {
  378         NULL,
  379         NULL,
  380         NULL,
  381         &ng_ksocket_sockaddr_parse,
  382         &ng_ksocket_sockaddr_unparse,
  383         NULL            /* no such thing as a default struct sockaddr */
  384 };
  385 
  386 /************************************************************************
  387                 STRUCT NG_KSOCKET_SOCKOPT PARSE TYPE
  388  ************************************************************************/
  389 
  390 /* Get length of the struct ng_ksocket_sockopt value field, which is the
  391    just the excess of the message argument portion over the length of
  392    the struct ng_ksocket_sockopt. */
  393 static int
  394 ng_parse_sockoptval_getLength(const struct ng_parse_type *type,
  395         const u_char *start, const u_char *buf)
  396 {
  397         static const int offset = OFFSETOF(struct ng_ksocket_sockopt, value);
  398         const struct ng_ksocket_sockopt *sopt;
  399         const struct ng_mesg *msg;
  400 
  401         sopt = (const struct ng_ksocket_sockopt *)(buf - offset);
  402         msg = (const struct ng_mesg *)((const u_char *)sopt - sizeof(*msg));
  403         return msg->header.arglen - sizeof(*sopt);
  404 }
  405 
  406 /* Parse type for the option value part of a struct ng_ksocket_sockopt
  407    XXX Eventually, we should handle the different socket options specially.
  408    XXX This would avoid byte order problems, eg an integer value of 1 is
  409    XXX going to be "[1]" for little endian or "[3=1]" for big endian. */
  410 static const struct ng_parse_type ng_ksocket_sockoptval_type = {
  411         &ng_parse_bytearray_type,
  412         &ng_parse_sockoptval_getLength
  413 };
  414 
  415 /* Parse type for struct ng_ksocket_sockopt */
  416 static const struct ng_parse_struct_field ng_ksocket_sockopt_type_fields[]
  417         = NG_KSOCKET_SOCKOPT_INFO(&ng_ksocket_sockoptval_type);
  418 static const struct ng_parse_type ng_ksocket_sockopt_type = {
  419         &ng_parse_struct_type,
  420         &ng_ksocket_sockopt_type_fields
  421 };
  422 
  423 /* Parse type for struct ng_ksocket_accept */
  424 static const struct ng_parse_struct_field ng_ksocket_accept_type_fields[]
  425         = NGM_KSOCKET_ACCEPT_INFO;
  426 static const struct ng_parse_type ng_ksocket_accept_type = {
  427         &ng_parse_struct_type,
  428         &ng_ksocket_accept_type_fields
  429 };
  430 
  431 /* List of commands and how to convert arguments to/from ASCII */
  432 static const struct ng_cmdlist ng_ksocket_cmds[] = {
  433         {
  434           NGM_KSOCKET_COOKIE,
  435           NGM_KSOCKET_BIND,
  436           "bind",
  437           &ng_ksocket_sockaddr_type,
  438           NULL
  439         },
  440         {
  441           NGM_KSOCKET_COOKIE,
  442           NGM_KSOCKET_LISTEN,
  443           "listen",
  444           &ng_parse_int32_type,
  445           NULL
  446         },
  447         {
  448           NGM_KSOCKET_COOKIE,
  449           NGM_KSOCKET_ACCEPT,
  450           "accept",
  451           NULL,
  452           &ng_ksocket_accept_type
  453         },
  454         {
  455           NGM_KSOCKET_COOKIE,
  456           NGM_KSOCKET_CONNECT,
  457           "connect",
  458           &ng_ksocket_sockaddr_type,
  459           &ng_parse_int32_type
  460         },
  461         {
  462           NGM_KSOCKET_COOKIE,
  463           NGM_KSOCKET_GETNAME,
  464           "getname",
  465           NULL,
  466           &ng_ksocket_sockaddr_type
  467         },
  468         {
  469           NGM_KSOCKET_COOKIE,
  470           NGM_KSOCKET_GETPEERNAME,
  471           "getpeername",
  472           NULL,
  473           &ng_ksocket_sockaddr_type
  474         },
  475         {
  476           NGM_KSOCKET_COOKIE,
  477           NGM_KSOCKET_SETOPT,
  478           "setopt",
  479           &ng_ksocket_sockopt_type,
  480           NULL
  481         },
  482         {
  483           NGM_KSOCKET_COOKIE,
  484           NGM_KSOCKET_GETOPT,
  485           "getopt",
  486           &ng_ksocket_sockopt_type,
  487           &ng_ksocket_sockopt_type
  488         },
  489         { 0 }
  490 };
  491 
  492 /* Node type descriptor */
  493 static struct ng_type ng_ksocket_typestruct = {
  494         NG_ABI_VERSION,
  495         NG_KSOCKET_NODE_TYPE,
  496         NULL,
  497         ng_ksocket_constructor,
  498         ng_ksocket_rcvmsg,
  499         ng_ksocket_shutdown,
  500         ng_ksocket_newhook,
  501         NULL,
  502         ng_ksocket_connect,
  503         ng_ksocket_rcvdata,
  504         ng_ksocket_disconnect,
  505         ng_ksocket_cmds
  506 };
  507 NETGRAPH_INIT(ksocket, &ng_ksocket_typestruct);
  508 
  509 #define ERROUT(x)       do { error = (x); goto done; } while (0)
  510 
  511 /************************************************************************
  512                         NETGRAPH NODE STUFF
  513  ************************************************************************/
  514 
  515 /*
  516  * Node type constructor
  517  * The NODE part is assumed to be all set up.
  518  * There is already a reference to the node for us.
  519  */
  520 static int
  521 ng_ksocket_constructor(node_p node)
  522 {
  523         priv_p priv;
  524 
  525         /* Allocate private structure */
  526         MALLOC(priv, priv_p, sizeof(*priv),
  527             M_NETGRAPH_KSOCKET, M_NOWAIT | M_ZERO);
  528         if (priv == NULL)
  529                 return (ENOMEM);
  530 
  531         LIST_INIT(&priv->embryos);
  532         /* cross link them */
  533         priv->node = node;
  534         NG_NODE_SET_PRIVATE(node, priv);
  535 
  536         /* Done */
  537         return (0);
  538 }
  539 
  540 /*
  541  * Give our OK for a hook to be added. The hook name is of the
  542  * form "<family>/<type>/<proto>" where the three components may
  543  * be decimal numbers or else aliases from the above lists.
  544  *
  545  * Connecting a hook amounts to opening the socket.  Disconnecting
  546  * the hook closes the socket and destroys the node as well.
  547  */
  548 static int
  549 ng_ksocket_newhook(node_p node, hook_p hook, const char *name0)
  550 {
  551         struct thread *td = curthread ? curthread : &thread0;   /* XXX broken */
  552         const priv_p priv = NG_NODE_PRIVATE(node);
  553         char *s1, *s2, name[NG_HOOKLEN+1];
  554         int family, type, protocol, error;
  555 
  556         /* Check if we're already connected */
  557         if (priv->hook != NULL)
  558                 return (EISCONN);
  559 
  560         if (priv->flags & KSF_CLONED) {
  561                 if (priv->flags & KSF_EMBRYONIC) {
  562                         /* Remove ourselves from our parent's embryo list */
  563                         LIST_REMOVE(priv, siblings);
  564                         priv->flags &= ~KSF_EMBRYONIC;
  565                 }
  566         } else {
  567                 /* Extract family, type, and protocol from hook name */
  568                 snprintf(name, sizeof(name), "%s", name0);
  569                 s1 = name;
  570                 if ((s2 = index(s1, '/')) == NULL)
  571                         return (EINVAL);
  572                 *s2++ = '\0';
  573                 family = ng_ksocket_parse(ng_ksocket_families, s1, 0);
  574                 if (family == -1)
  575                         return (EINVAL);
  576                 s1 = s2;
  577                 if ((s2 = index(s1, '/')) == NULL)
  578                         return (EINVAL);
  579                 *s2++ = '\0';
  580                 type = ng_ksocket_parse(ng_ksocket_types, s1, 0);
  581                 if (type == -1)
  582                         return (EINVAL);
  583                 s1 = s2;
  584                 protocol = ng_ksocket_parse(ng_ksocket_protos, s1, family);
  585                 if (protocol == -1)
  586                         return (EINVAL);
  587 
  588                 /* Create the socket */
  589                 error = socreate(family, &priv->so, type, protocol,
  590                    td->td_ucred, td);
  591                 if (error != 0)
  592                         return (error);
  593 
  594                 /* XXX call soreserve() ? */
  595 
  596         }
  597 
  598         /* OK */
  599         priv->hook = hook;
  600         return(0);
  601 }
  602 
  603 static int
  604 ng_ksocket_connect(hook_p hook)
  605 {
  606         node_p node = NG_HOOK_NODE(hook);
  607         const priv_p priv = NG_NODE_PRIVATE(node);
  608         struct socket *const so = priv->so;
  609 
  610         /* Add our hook for incoming data and other events */
  611         priv->so->so_upcallarg = (caddr_t)node;
  612         priv->so->so_upcall = ng_ksocket_incoming;
  613         priv->so->so_rcv.sb_flags |= SB_UPCALL;
  614         priv->so->so_snd.sb_flags |= SB_UPCALL;
  615         priv->so->so_state |= SS_NBIO;
  616         /*
  617          * --Original comment--
  618          * On a cloned socket we may have already received one or more
  619          * upcalls which we couldn't handle without a hook.  Handle
  620          * those now.
  621          * We cannot call the upcall function directly
  622          * from here, because until this function has returned our
  623          * hook isn't connected.
  624          *
  625          * ---meta comment for -current ---
  626          * XXX This is dubius.
  627          * Upcalls between the time that the hook was
  628          * first created and now (on another processesor) will
  629          * be earlier on the queue than the request to finalise the hook.
  630          * By the time the hook is finalised,
  631          * The queued upcalls will have happenned and the code
  632          * will have discarded them because of a lack of a hook.
  633          * (socket not open).
  634          *
  635          * This is a bad byproduct of the complicated way in which hooks
  636          * are now created (3 daisy chained async events).
  637          *
  638          * Since we are a netgraph operation 
  639          * We know that we hold a lock on this node. This forces the
  640          * request we make below to be queued rather than implemented
  641          * immediatly which will cause the upcall function to be called a bit
  642          * later.
  643          * However, as we will run any waiting queued operations immediatly
  644          * after doing this one, if we have not finalised the other end
  645          * of the hook, those queued operations will fail.
  646          */
  647         if (priv->flags & KSF_CLONED) {
  648                 ng_send_fn(node, NULL, &ng_ksocket_incoming2, so, M_NOWAIT);
  649         }
  650 
  651         return (0);
  652 }
  653 
  654 /*
  655  * Receive a control message
  656  */
  657 static int
  658 ng_ksocket_rcvmsg(node_p node, item_p item, hook_p lasthook)
  659 {
  660         struct thread *td = curthread ? curthread : &thread0;   /* XXX broken */
  661         const priv_p priv = NG_NODE_PRIVATE(node);
  662         struct socket *const so = priv->so;
  663         struct ng_mesg *resp = NULL;
  664         int error = 0;
  665         struct ng_mesg *msg;
  666         ng_ID_t raddr;
  667 
  668         NGI_GET_MSG(item, msg);
  669         switch (msg->header.typecookie) {
  670         case NGM_KSOCKET_COOKIE:
  671                 switch (msg->header.cmd) {
  672                 case NGM_KSOCKET_BIND:
  673                     {
  674                         struct sockaddr *const sa
  675                             = (struct sockaddr *)msg->data;
  676 
  677                         /* Sanity check */
  678                         if (msg->header.arglen < SADATA_OFFSET
  679                             || msg->header.arglen < sa->sa_len)
  680                                 ERROUT(EINVAL);
  681                         if (so == NULL)
  682                                 ERROUT(ENXIO);
  683 
  684                         /* Bind */
  685                         error = sobind(so, sa, td);
  686                         break;
  687                     }
  688                 case NGM_KSOCKET_LISTEN:
  689                     {
  690                         /* Sanity check */
  691                         if (msg->header.arglen != sizeof(int32_t))
  692                                 ERROUT(EINVAL);
  693                         if (so == NULL)
  694                                 ERROUT(ENXIO);
  695 
  696                         /* Listen */
  697                         error = solisten(so, *((int32_t *)msg->data), td);
  698                         break;
  699                     }
  700 
  701                 case NGM_KSOCKET_ACCEPT:
  702                     {
  703                         /* Sanity check */
  704                         if (msg->header.arglen != 0)
  705                                 ERROUT(EINVAL);
  706                         if (so == NULL)
  707                                 ERROUT(ENXIO);
  708 
  709                         /* Make sure the socket is capable of accepting */
  710                         if (!(so->so_options & SO_ACCEPTCONN))
  711                                 ERROUT(EINVAL);
  712                         if (priv->flags & KSF_ACCEPTING)
  713                                 ERROUT(EALREADY);
  714 
  715                         error = ng_ksocket_check_accept(priv);
  716                         if (error != 0 && error != EWOULDBLOCK)
  717                                 ERROUT(error);
  718 
  719                         /*
  720                          * If a connection is already complete, take it.
  721                          * Otherwise let the upcall function deal with
  722                          * the connection when it comes in.
  723                          */
  724                         priv->response_token = msg->header.token;
  725                         raddr = priv->response_addr = NGI_RETADDR(item);
  726                         if (error == 0) {
  727                                 ng_ksocket_finish_accept(priv);
  728                         } else
  729                                 priv->flags |= KSF_ACCEPTING;
  730                         break;
  731                     }
  732 
  733                 case NGM_KSOCKET_CONNECT:
  734                     {
  735                         struct sockaddr *const sa
  736                             = (struct sockaddr *)msg->data;
  737 
  738                         /* Sanity check */
  739                         if (msg->header.arglen < SADATA_OFFSET
  740                             || msg->header.arglen < sa->sa_len)
  741                                 ERROUT(EINVAL);
  742                         if (so == NULL)
  743                                 ERROUT(ENXIO);
  744 
  745                         /* Do connect */
  746                         if ((so->so_state & SS_ISCONNECTING) != 0)
  747                                 ERROUT(EALREADY);
  748                         if ((error = soconnect(so, sa, td)) != 0) {
  749                                 so->so_state &= ~SS_ISCONNECTING;
  750                                 ERROUT(error);
  751                         }
  752                         if ((so->so_state & SS_ISCONNECTING) != 0) {
  753                                 /* We will notify the sender when we connect */
  754                                 priv->response_token = msg->header.token;
  755                                 raddr = priv->response_addr = NGI_RETADDR(item);
  756                                 priv->flags |= KSF_CONNECTING;
  757                                 ERROUT(EINPROGRESS);
  758                         }
  759                         break;
  760                     }
  761 
  762                 case NGM_KSOCKET_GETNAME:
  763                 case NGM_KSOCKET_GETPEERNAME:
  764                     {
  765                         int (*func)(struct socket *so, struct sockaddr **nam);
  766                         struct sockaddr *sa = NULL;
  767                         int len;
  768 
  769                         /* Sanity check */
  770                         if (msg->header.arglen != 0)
  771                                 ERROUT(EINVAL);
  772                         if (so == NULL)
  773                                 ERROUT(ENXIO);
  774 
  775                         /* Get function */
  776                         if (msg->header.cmd == NGM_KSOCKET_GETPEERNAME) {
  777                                 if ((so->so_state
  778                                     & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) 
  779                                         ERROUT(ENOTCONN);
  780                                 func = so->so_proto->pr_usrreqs->pru_peeraddr;
  781                         } else
  782                                 func = so->so_proto->pr_usrreqs->pru_sockaddr;
  783 
  784                         /* Get local or peer address */
  785                         if ((error = (*func)(so, &sa)) != 0)
  786                                 goto bail;
  787                         len = (sa == NULL) ? 0 : sa->sa_len;
  788 
  789                         /* Send it back in a response */
  790                         NG_MKRESPONSE(resp, msg, len, M_NOWAIT);
  791                         if (resp == NULL) {
  792                                 error = ENOMEM;
  793                                 goto bail;
  794                         }
  795                         bcopy(sa, resp->data, len);
  796 
  797                 bail:
  798                         /* Cleanup */
  799                         if (sa != NULL)
  800                                 FREE(sa, M_SONAME);
  801                         break;
  802                     }
  803 
  804                 case NGM_KSOCKET_GETOPT:
  805                     {
  806                         struct ng_ksocket_sockopt *ksopt = 
  807                             (struct ng_ksocket_sockopt *)msg->data;
  808                         struct sockopt sopt;
  809 
  810                         /* Sanity check */
  811                         if (msg->header.arglen != sizeof(*ksopt))
  812                                 ERROUT(EINVAL);
  813                         if (so == NULL)
  814                                 ERROUT(ENXIO);
  815 
  816                         /* Get response with room for option value */
  817                         NG_MKRESPONSE(resp, msg, sizeof(*ksopt)
  818                             + NG_KSOCKET_MAX_OPTLEN, M_NOWAIT);
  819                         if (resp == NULL)
  820                                 ERROUT(ENOMEM);
  821 
  822                         /* Get socket option, and put value in the response */
  823                         sopt.sopt_dir = SOPT_GET;
  824                         sopt.sopt_level = ksopt->level;
  825                         sopt.sopt_name = ksopt->name;
  826                         sopt.sopt_td = NULL;
  827                         sopt.sopt_valsize = NG_KSOCKET_MAX_OPTLEN;
  828                         ksopt = (struct ng_ksocket_sockopt *)resp->data;
  829                         sopt.sopt_val = ksopt->value;
  830                         if ((error = sogetopt(so, &sopt)) != 0) {
  831                                 NG_FREE_MSG(resp);
  832                                 break;
  833                         }
  834 
  835                         /* Set actual value length */
  836                         resp->header.arglen = sizeof(*ksopt)
  837                             + sopt.sopt_valsize;
  838                         break;
  839                     }
  840 
  841                 case NGM_KSOCKET_SETOPT:
  842                     {
  843                         struct ng_ksocket_sockopt *const ksopt = 
  844                             (struct ng_ksocket_sockopt *)msg->data;
  845                         const int valsize = msg->header.arglen - sizeof(*ksopt);
  846                         struct sockopt sopt;
  847 
  848                         /* Sanity check */
  849                         if (valsize < 0)
  850                                 ERROUT(EINVAL);
  851                         if (so == NULL)
  852                                 ERROUT(ENXIO);
  853 
  854                         /* Set socket option */
  855                         sopt.sopt_dir = SOPT_SET;
  856                         sopt.sopt_level = ksopt->level;
  857                         sopt.sopt_name = ksopt->name;
  858                         sopt.sopt_val = ksopt->value;
  859                         sopt.sopt_valsize = valsize;
  860                         sopt.sopt_td = NULL;
  861                         error = sosetopt(so, &sopt);
  862                         break;
  863                     }
  864 
  865                 default:
  866                         error = EINVAL;
  867                         break;
  868                 }
  869                 break;
  870         default:
  871                 error = EINVAL;
  872                 break;
  873         }
  874 done:
  875         NG_RESPOND_MSG(error, node, item, resp);
  876         NG_FREE_MSG(msg);
  877         return (error);
  878 }
  879 
  880 /*
  881  * Receive incoming data on our hook.  Send it out the socket.
  882  */
  883 static int
  884 ng_ksocket_rcvdata(hook_p hook, item_p item)
  885 {
  886         struct thread *td = curthread ? curthread : &thread0;   /* XXX broken */
  887         const node_p node = NG_HOOK_NODE(hook);
  888         const priv_p priv = NG_NODE_PRIVATE(node);
  889         struct socket *const so = priv->so;
  890         struct sockaddr *sa = NULL;
  891         meta_p meta;
  892         int error;
  893         struct mbuf *m;
  894 
  895         /* Avoid reentrantly sending on the socket */
  896         if ((priv->flags & KSF_SENDING) != 0) {
  897                 NG_FREE_ITEM(item);
  898                 return (EDEADLK);
  899         }
  900 
  901         /* Extract data and meta information */
  902         NGI_GET_M(item, m);
  903         NGI_GET_META(item, meta);
  904         NG_FREE_ITEM(item);
  905 
  906         /* If any meta info, look for peer socket address */
  907         if (meta != NULL) {
  908                 struct meta_field_header *field;
  909 
  910                 /* Look for peer socket address */
  911                 for (field = &meta->options[0];
  912                     (caddr_t)field < (caddr_t)meta + meta->used_len;
  913                     field = (struct meta_field_header *)
  914                       ((caddr_t)field + field->len)) {
  915                         if (field->cookie != NGM_KSOCKET_COOKIE
  916                             || field->type != NG_KSOCKET_META_SOCKADDR)
  917                                 continue;
  918                         sa = (struct sockaddr *)field->data;
  919                         break;
  920                 }
  921         }
  922 
  923         /* Send packet */
  924         priv->flags |= KSF_SENDING;
  925         error = (*so->so_proto->pr_usrreqs->pru_sosend)(so, sa, 0, m, 0, 0, td);
  926         priv->flags &= ~KSF_SENDING;
  927 
  928         /* Clean up and exit */
  929         NG_FREE_META(meta);
  930         return (error);
  931 }
  932 
  933 /*
  934  * Destroy node
  935  */
  936 static int
  937 ng_ksocket_shutdown(node_p node)
  938 {
  939         const priv_p priv = NG_NODE_PRIVATE(node);
  940         priv_p embryo;
  941 
  942         /* Close our socket (if any) */
  943         if (priv->so != NULL) {
  944                 priv->so->so_upcall = NULL;
  945                 priv->so->so_rcv.sb_flags &= ~SB_UPCALL;
  946                 priv->so->so_snd.sb_flags &= ~SB_UPCALL;
  947                 soclose(priv->so);
  948                 priv->so = NULL;
  949         }
  950 
  951         /* If we are an embryo, take ourselves out of the parent's list */
  952         if (priv->flags & KSF_EMBRYONIC) {
  953                 LIST_REMOVE(priv, siblings);
  954                 priv->flags &= ~KSF_EMBRYONIC;
  955         }
  956 
  957         /* Remove any embryonic children we have */
  958         while (!LIST_EMPTY(&priv->embryos)) {
  959                 embryo = LIST_FIRST(&priv->embryos);
  960                 ng_rmnode_self(embryo->node);
  961         }
  962 
  963         /* Take down netgraph node */
  964         bzero(priv, sizeof(*priv));
  965         FREE(priv, M_NETGRAPH_KSOCKET);
  966         NG_NODE_SET_PRIVATE(node, NULL);
  967         NG_NODE_UNREF(node);            /* let the node escape */
  968         return (0);
  969 }
  970 
  971 /*
  972  * Hook disconnection
  973  */
  974 static int
  975 ng_ksocket_disconnect(hook_p hook)
  976 {
  977         KASSERT(NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0,
  978             ("%s: numhooks=%d?", __func__,
  979             NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook))));
  980         if (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))
  981                 ng_rmnode_self(NG_HOOK_NODE(hook));
  982         return (0);
  983 }
  984 
  985 /************************************************************************
  986                         HELPER STUFF
  987  ************************************************************************/
  988 /* 
  989  * You should no-longer "just call" a netgraph node function
  990  * from an external asynchronous event.
  991  * This is because in doing so you are ignoring the locking on the netgraph
  992  * nodes. Instead call your function via 
  993  * "int ng_send_fn(node_p node, hook_p hook, ng_item_fn *fn,
  994  *       void *arg1, int arg2);"
  995  * this will call the function you chose, but will first do all the 
  996  * locking rigmarole. Your function MAY only be called at some distant future
  997  * time (several millisecs away) so don't give it any arguments
  998  * that may be revoked soon (e.g. on your stack).
  999  * In this case even the 'so' argument is doubtful. 
 1000  * While the function request is being processed the node
 1001  * has an extra reference and as such will not disappear until
 1002  * the request has at least been done, but the 'so' may not be so lucky.
 1003  * handle this by checking the validity of the node in the target function
 1004  * before dereferencing the socket pointer.
 1005  */
 1006 
 1007 static void
 1008 ng_ksocket_incoming(struct socket *so, void *arg, int waitflag)
 1009 {
 1010         const node_p node = arg;
 1011 
 1012         ng_send_fn(node, NULL, &ng_ksocket_incoming2, so, waitflag);
 1013 }
 1014 
 1015 
 1016 /*
 1017  * When incoming data is appended to the socket, we get notified here.
 1018  * This is also called whenever a significant event occurs for the socket.
 1019  * We know that HOOK is NULL. Because of how we were called we know we have a 
 1020  * lock on this node an are participating inthe netgraph locking.
 1021  * Our original caller may have queued this even some time ago and 
 1022  * we cannot trust that he even still exists. The node however is being
 1023  * held with a reference by the queueing code, at least until we finish,
 1024  * even if it has been zapped, so first check it's validiy 
 1025  * before we trust the socket (which was derived from it).
 1026  */
 1027 static void
 1028 ng_ksocket_incoming2(node_p node, hook_p hook, void *arg1, int waitflag)
 1029 {
 1030         struct socket *so = arg1;
 1031         const priv_p priv = NG_NODE_PRIVATE(node);
 1032         struct mbuf *m;
 1033         struct ng_mesg *response;
 1034         struct uio auio;
 1035         int s, flags, error;
 1036 
 1037         s = splnet();
 1038 
 1039         /* Sanity check */
 1040         if (NG_NODE_NOT_VALID(node)) {
 1041                 splx(s);
 1042                 return;
 1043         }
 1044         /* so = priv->so; *//* XXX could have derived this like so */
 1045         KASSERT(so == priv->so, ("%s: wrong socket", __func__));
 1046 
 1047         /* Check whether a pending connect operation has completed */
 1048         if (priv->flags & KSF_CONNECTING) {
 1049                 if ((error = so->so_error) != 0) {
 1050                         so->so_error = 0;
 1051                         so->so_state &= ~SS_ISCONNECTING;
 1052                 }
 1053                 if (!(so->so_state & SS_ISCONNECTING)) {
 1054                         NG_MKMESSAGE(response, NGM_KSOCKET_COOKIE,
 1055                             NGM_KSOCKET_CONNECT, sizeof(int32_t), waitflag);
 1056                         if (response != NULL) {
 1057                                 response->header.flags |= NGF_RESP;
 1058                                 response->header.token = priv->response_token;
 1059                                 *(int32_t *)response->data = error;
 1060                                 /* 
 1061                                  * send an async "response" message
 1062                                  * to the node that set us up
 1063                                  * (if it still exists)
 1064                                  */
 1065                                 NG_SEND_MSG_ID(error, node,
 1066                                     response, priv->response_addr, 0);
 1067                         }
 1068                         priv->flags &= ~KSF_CONNECTING;
 1069                 }
 1070         }
 1071 
 1072         /* Check whether a pending accept operation has completed */
 1073         if (priv->flags & KSF_ACCEPTING) {
 1074                 error = ng_ksocket_check_accept(priv);
 1075                 if (error != EWOULDBLOCK)
 1076                         priv->flags &= ~KSF_ACCEPTING;
 1077                 if (error == 0)
 1078                         ng_ksocket_finish_accept(priv);
 1079         }
 1080 
 1081         /*
 1082          * If we don't have a hook, we must handle data events later.  When
 1083          * the hook gets created and is connected, this upcall function
 1084          * will be called again.
 1085          */
 1086         if (priv->hook == NULL) {
 1087                 splx(s);
 1088                 return;
 1089         }
 1090 
 1091         /* Read and forward available mbuf's */
 1092         auio.uio_td = NULL;
 1093         auio.uio_resid = 1000000000;
 1094         flags = MSG_DONTWAIT;
 1095         while (1) {
 1096                 struct sockaddr *sa = NULL;
 1097                 meta_p meta = NULL;
 1098                 struct mbuf *n;
 1099 
 1100                 /* Try to get next packet from socket */
 1101                 if ((error = (*so->so_proto->pr_usrreqs->pru_soreceive)
 1102                     (so, (so->so_state & SS_ISCONNECTED) ? NULL : &sa,
 1103                     &auio, &m, (struct mbuf **)0, &flags)) != 0)
 1104                         break;
 1105 
 1106                 /* See if we got anything */
 1107                 if (m == NULL) {
 1108                         if (sa != NULL)
 1109                                 FREE(sa, M_SONAME);
 1110                         break;
 1111                 }
 1112 
 1113                 /* Don't trust the various socket layers to get the
 1114                    packet header and length correct (eg. kern/15175) */
 1115                 for (n = m, m->m_pkthdr.len = 0; n != NULL; n = n->m_next)
 1116                         m->m_pkthdr.len += n->m_len;
 1117 
 1118                 /* Put peer's socket address (if any) into a meta info blob */
 1119                 if (sa != NULL) {
 1120                         struct meta_field_header *mhead;
 1121                         u_int len;
 1122 
 1123                         len = sizeof(*meta) + sizeof(*mhead) + sa->sa_len;
 1124                         MALLOC(meta, meta_p, len, M_NETGRAPH_META, M_NOWAIT);
 1125                         if (meta == NULL) {
 1126                                 FREE(sa, M_SONAME);
 1127                                 goto sendit;
 1128                         }
 1129                         mhead = &meta->options[0];
 1130                         bzero(meta, sizeof(*meta));
 1131                         bzero(mhead, sizeof(*mhead));
 1132                         meta->allocated_len = len;
 1133                         meta->used_len = len;
 1134                         mhead->cookie = NGM_KSOCKET_COOKIE;
 1135                         mhead->type = NG_KSOCKET_META_SOCKADDR;
 1136                         mhead->len = sizeof(*mhead) + sa->sa_len;
 1137                         bcopy(sa, mhead->data, sa->sa_len);
 1138                         FREE(sa, M_SONAME);
 1139                 }
 1140 
 1141 sendit:         /* Forward data with optional peer sockaddr as meta info */
 1142                 NG_SEND_DATA(error, priv->hook, m, meta);
 1143         }
 1144 
 1145         /*
 1146          * If the peer has closed the connection, forward a 0-length mbuf
 1147          * to indicate end-of-file.
 1148          */
 1149         if (so->so_state & SS_CANTRCVMORE && !(priv->flags & KSF_EOFSEEN)) {
 1150                 MGETHDR(m, waitflag, MT_DATA);
 1151                 if (m != NULL) {
 1152                         m->m_len = m->m_pkthdr.len = 0;
 1153                         NG_SEND_DATA_ONLY(error, priv->hook, m);
 1154                 }
 1155                 priv->flags |= KSF_EOFSEEN;
 1156         }
 1157         splx(s);
 1158 }
 1159 
 1160 /*
 1161  * Check for a completed incoming connection and return 0 if one is found.
 1162  * Otherwise return the appropriate error code.
 1163  */
 1164 static int
 1165 ng_ksocket_check_accept(priv_p priv)
 1166 {
 1167         struct socket *const head = priv->so;
 1168         int error;
 1169 
 1170         if ((error = head->so_error) != 0) {
 1171                 head->so_error = 0;
 1172                 return error;
 1173         }
 1174         if (TAILQ_EMPTY(&head->so_comp)) {
 1175                 if (head->so_state & SS_CANTRCVMORE)
 1176                         return ECONNABORTED;
 1177                 return EWOULDBLOCK;
 1178         }
 1179         return 0;
 1180 }
 1181 
 1182 /*
 1183  * Handle the first completed incoming connection, assumed to be already
 1184  * on the socket's so_comp queue.
 1185  */
 1186 static void
 1187 ng_ksocket_finish_accept(priv_p priv)
 1188 {
 1189         struct socket *const head = priv->so;
 1190         struct socket *so;
 1191         struct sockaddr *sa = NULL;
 1192         struct ng_mesg *resp;
 1193         struct ng_ksocket_accept *resp_data;
 1194         node_p node;
 1195         priv_p priv2;
 1196         int len;
 1197         int error;
 1198 
 1199         so = TAILQ_FIRST(&head->so_comp);
 1200         if (so == NULL)         /* Should never happen */
 1201                 return;
 1202         TAILQ_REMOVE(&head->so_comp, so, so_list);
 1203         head->so_qlen--;
 1204 
 1205         /* XXX KNOTE(&head->so_rcv.sb_sel.si_note, 0); */
 1206 
 1207         soref(so);
 1208 
 1209         so->so_state &= ~SS_COMP;
 1210         so->so_state |= SS_NBIO;
 1211         so->so_head = NULL;
 1212 
 1213         soaccept(so, &sa);
 1214 
 1215         len = OFFSETOF(struct ng_ksocket_accept, addr);
 1216         if (sa != NULL)
 1217                 len += sa->sa_len;
 1218 
 1219         NG_MKMESSAGE(resp, NGM_KSOCKET_COOKIE, NGM_KSOCKET_ACCEPT, len,
 1220             M_NOWAIT);
 1221         if (resp == NULL) {
 1222                 soclose(so);
 1223                 goto out;
 1224         }
 1225         resp->header.flags |= NGF_RESP;
 1226         resp->header.token = priv->response_token;
 1227 
 1228         /* Clone a ksocket node to wrap the new socket */
 1229         error = ng_make_node_common(&ng_ksocket_typestruct, &node);
 1230         if (error) {
 1231                 FREE(resp, M_NETGRAPH);
 1232                 soclose(so);
 1233                 goto out;
 1234         }
 1235 
 1236         if (ng_ksocket_constructor(node) != 0) {
 1237                 NG_NODE_UNREF(node);
 1238                 FREE(resp, M_NETGRAPH);
 1239                 soclose(so);
 1240                 goto out;
 1241         }
 1242 
 1243         priv2 = NG_NODE_PRIVATE(node);
 1244         priv2->so = so;
 1245         priv2->flags |= KSF_CLONED | KSF_EMBRYONIC;
 1246 
 1247         /*
 1248          * Insert the cloned node into a list of embryonic children
 1249          * on the parent node.  When a hook is created on the cloned
 1250          * node it will be removed from this list.  When the parent
 1251          * is destroyed it will destroy any embryonic children it has.
 1252          */
 1253         LIST_INSERT_HEAD(&priv->embryos, priv2, siblings);
 1254 
 1255         so->so_upcallarg = (caddr_t)node;
 1256         so->so_upcall = ng_ksocket_incoming;
 1257         so->so_rcv.sb_flags |= SB_UPCALL;
 1258         so->so_snd.sb_flags |= SB_UPCALL;
 1259 
 1260         /* Fill in the response data and send it or return it to the caller */
 1261         resp_data = (struct ng_ksocket_accept *)resp->data;
 1262         resp_data->nodeid = NG_NODE_ID(node);
 1263         if (sa != NULL)
 1264                 bcopy(sa, &resp_data->addr, sa->sa_len);
 1265         NG_SEND_MSG_ID(error, node, resp, priv->response_addr, 0);
 1266 
 1267 out:
 1268         if (sa != NULL)
 1269                 FREE(sa, M_SONAME);
 1270 }
 1271 
 1272 /*
 1273  * Parse out either an integer value or an alias.
 1274  */
 1275 static int
 1276 ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
 1277         const char *s, int family)
 1278 {
 1279         int k, val;
 1280         char *eptr;
 1281 
 1282         /* Try aliases */
 1283         for (k = 0; aliases[k].name != NULL; k++) {
 1284                 if (strcmp(s, aliases[k].name) == 0
 1285                     && aliases[k].family == family)
 1286                         return aliases[k].value;
 1287         }
 1288 
 1289         /* Try parsing as a number */
 1290         val = (int)strtoul(s, &eptr, 10);
 1291         if (val < 0 || *eptr != '\0')
 1292                 return (-1);
 1293         return (val);
 1294 }
 1295 

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