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  * ng_ksocket.c
    3  */
    4 
    5 /*-
    6  * Copyright (c) 1996-1999 Whistle Communications, Inc.
    7  * All rights reserved.
    8  * 
    9  * Subject to the following obligations and disclaimer of warranty, use and
   10  * redistribution of this software, in source or object code forms, with or
   11  * without modifications are expressly permitted by Whistle Communications;
   12  * provided, however, that:
   13  * 1. Any and all reproductions of the source or object code must include the
   14  *    copyright notice above and the following disclaimer of warranties; and
   15  * 2. No rights are granted, in any manner or form, to use Whistle
   16  *    Communications, Inc. trademarks, including the mark "WHISTLE
   17  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
   18  *    such appears in the above copyright notice or in the software.
   19  * 
   20  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
   21  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
   22  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
   23  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
   24  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
   25  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
   26  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
   27  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
   28  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   29  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
   30  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   31  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
   32  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
   33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   35  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
   36  * OF SUCH DAMAGE.
   37  *
   38  * Author: Archie Cobbs <archie@freebsd.org>
   39  *
   40  * $FreeBSD: releng/12.0/sys/netgraph/ng_ksocket.c 319944 2017-06-14 16:13:20Z glebius $
   41  * $Whistle: ng_ksocket.c,v 1.1 1999/11/16 20:04:40 archie Exp $
   42  */
   43 
   44 /*
   45  * Kernel socket node type.  This node type is basically a kernel-mode
   46  * version of a socket... kindof like the reverse of the socket node type.
   47  */
   48 
   49 #include <sys/param.h>
   50 #include <sys/systm.h>
   51 #include <sys/kernel.h>
   52 #include <sys/mbuf.h>
   53 #include <sys/proc.h>
   54 #include <sys/malloc.h>
   55 #include <sys/ctype.h>
   56 #include <sys/protosw.h>
   57 #include <sys/errno.h>
   58 #include <sys/socket.h>
   59 #include <sys/socketvar.h>
   60 #include <sys/uio.h>
   61 #include <sys/un.h>
   62 
   63 #include <netgraph/ng_message.h>
   64 #include <netgraph/netgraph.h>
   65 #include <netgraph/ng_parse.h>
   66 #include <netgraph/ng_ksocket.h>
   67 
   68 #include <netinet/in.h>
   69 #include <netinet/ip.h>
   70 
   71 #ifdef NG_SEPARATE_MALLOC
   72 static MALLOC_DEFINE(M_NETGRAPH_KSOCKET, "netgraph_ksock",
   73     "netgraph ksock node");
   74 #else
   75 #define M_NETGRAPH_KSOCKET M_NETGRAPH
   76 #endif
   77 
   78 #define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0))
   79 #define SADATA_OFFSET   (OFFSETOF(struct sockaddr, sa_data))
   80 
   81 /* Node private data */
   82 struct ng_ksocket_private {
   83         node_p          node;
   84         hook_p          hook;
   85         struct socket   *so;
   86         int             fn_sent;        /* FN call on incoming event was sent */
   87         LIST_HEAD(, ng_ksocket_private) embryos;
   88         LIST_ENTRY(ng_ksocket_private)  siblings;
   89         u_int32_t       flags;
   90         u_int32_t       response_token;
   91         ng_ID_t         response_addr;
   92 };
   93 typedef struct ng_ksocket_private *priv_p;
   94 
   95 /* Flags for priv_p */
   96 #define KSF_CONNECTING  0x00000001      /* Waiting for connection complete */
   97 #define KSF_ACCEPTING   0x00000002      /* Waiting for accept complete */
   98 #define KSF_EOFSEEN     0x00000004      /* Have sent 0-length EOF mbuf */
   99 #define KSF_CLONED      0x00000008      /* Cloned from an accepting socket */
  100 #define KSF_EMBRYONIC   0x00000010      /* Cloned node with no hooks yet */
  101 
  102 /* Netgraph node methods */
  103 static ng_constructor_t ng_ksocket_constructor;
  104 static ng_rcvmsg_t      ng_ksocket_rcvmsg;
  105 static ng_shutdown_t    ng_ksocket_shutdown;
  106 static ng_newhook_t     ng_ksocket_newhook;
  107 static ng_rcvdata_t     ng_ksocket_rcvdata;
  108 static ng_connect_t     ng_ksocket_connect;
  109 static ng_disconnect_t  ng_ksocket_disconnect;
  110 
  111 /* Alias structure */
  112 struct ng_ksocket_alias {
  113         const char      *name;
  114         const int       value;
  115         const int       family;
  116 };
  117 
  118 /* Protocol family aliases */
  119 static const struct ng_ksocket_alias ng_ksocket_families[] = {
  120         { "local",      PF_LOCAL        },
  121         { "inet",       PF_INET         },
  122         { "inet6",      PF_INET6        },
  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         { "pim",        IPPROTO_PIM,            PF_INET         },
  152         { NULL,         -1                                      },
  153 };
  154 
  155 /* Helper functions */
  156 static int      ng_ksocket_accept(priv_p);
  157 static int      ng_ksocket_incoming(struct socket *so, void *arg, int waitflag);
  158 static int      ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
  159                         const char *s, int family);
  160 static void     ng_ksocket_incoming2(node_p node, hook_p hook,
  161                         void *arg1, int arg2);
  162 
  163 /************************************************************************
  164                         STRUCT SOCKADDR PARSE TYPE
  165  ************************************************************************/
  166 
  167 /* Get the length of the data portion of a generic struct sockaddr */
  168 static int
  169 ng_parse_generic_sockdata_getLength(const struct ng_parse_type *type,
  170         const u_char *start, const u_char *buf)
  171 {
  172         const struct sockaddr *sa;
  173 
  174         sa = (const struct sockaddr *)(buf - SADATA_OFFSET);
  175         return (sa->sa_len < SADATA_OFFSET) ? 0 : sa->sa_len - SADATA_OFFSET;
  176 }
  177 
  178 /* Type for the variable length data portion of a generic struct sockaddr */
  179 static const struct ng_parse_type ng_ksocket_generic_sockdata_type = {
  180         &ng_parse_bytearray_type,
  181         &ng_parse_generic_sockdata_getLength
  182 };
  183 
  184 /* Type for a generic struct sockaddr */
  185 static const struct ng_parse_struct_field
  186     ng_parse_generic_sockaddr_type_fields[] = {
  187           { "len",      &ng_parse_uint8_type                    },
  188           { "family",   &ng_parse_uint8_type                    },
  189           { "data",     &ng_ksocket_generic_sockdata_type       },
  190           { NULL }
  191 };
  192 static const struct ng_parse_type ng_ksocket_generic_sockaddr_type = {
  193         &ng_parse_struct_type,
  194         &ng_parse_generic_sockaddr_type_fields
  195 };
  196 
  197 /* Convert a struct sockaddr from ASCII to binary.  If its a protocol
  198    family that we specially handle, do that, otherwise defer to the
  199    generic parse type ng_ksocket_generic_sockaddr_type. */
  200 static int
  201 ng_ksocket_sockaddr_parse(const struct ng_parse_type *type,
  202         const char *s, int *off, const u_char *const start,
  203         u_char *const buf, int *buflen)
  204 {
  205         struct sockaddr *const sa = (struct sockaddr *)buf;
  206         enum ng_parse_token tok;
  207         char fambuf[32];
  208         int family, len;
  209         char *t;
  210 
  211         /* If next token is a left curly brace, use generic parse type */
  212         if ((tok = ng_parse_get_token(s, off, &len)) == T_LBRACE) {
  213                 return (*ng_ksocket_generic_sockaddr_type.supertype->parse)
  214                     (&ng_ksocket_generic_sockaddr_type,
  215                     s, off, start, buf, buflen);
  216         }
  217 
  218         /* Get socket address family followed by a slash */
  219         while (isspace(s[*off]))
  220                 (*off)++;
  221         if ((t = strchr(s + *off, '/')) == NULL)
  222                 return (EINVAL);
  223         if ((len = t - (s + *off)) > sizeof(fambuf) - 1)
  224                 return (EINVAL);
  225         strncpy(fambuf, s + *off, len);
  226         fambuf[len] = '\0';
  227         *off += len + 1;
  228         if ((family = ng_ksocket_parse(ng_ksocket_families, fambuf, 0)) == -1)
  229                 return (EINVAL);
  230 
  231         /* Set family */
  232         if (*buflen < SADATA_OFFSET)
  233                 return (ERANGE);
  234         sa->sa_family = family;
  235 
  236         /* Set family-specific data and length */
  237         switch (sa->sa_family) {
  238         case PF_LOCAL:          /* Get pathname */
  239             {
  240                 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
  241                 struct sockaddr_un *const sun = (struct sockaddr_un *)sa;
  242                 int toklen, pathlen;
  243                 char *path;
  244 
  245                 if ((path = ng_get_string_token(s, off, &toklen, NULL)) == NULL)
  246                         return (EINVAL);
  247                 pathlen = strlen(path);
  248                 if (pathlen > SOCK_MAXADDRLEN) {
  249                         free(path, M_NETGRAPH_KSOCKET);
  250                         return (E2BIG);
  251                 }
  252                 if (*buflen < pathoff + pathlen) {
  253                         free(path, M_NETGRAPH_KSOCKET);
  254                         return (ERANGE);
  255                 }
  256                 *off += toklen;
  257                 bcopy(path, sun->sun_path, pathlen);
  258                 sun->sun_len = pathoff + pathlen;
  259                 free(path, M_NETGRAPH_KSOCKET);
  260                 break;
  261             }
  262 
  263         case PF_INET:           /* Get an IP address with optional port */
  264             {
  265                 struct sockaddr_in *const sin = (struct sockaddr_in *)sa;
  266                 int i;
  267 
  268                 /* Parse this: <ipaddress>[:port] */
  269                 for (i = 0; i < 4; i++) {
  270                         u_long val;
  271                         char *eptr;
  272 
  273                         val = strtoul(s + *off, &eptr, 10);
  274                         if (val > 0xff || eptr == s + *off)
  275                                 return (EINVAL);
  276                         *off += (eptr - (s + *off));
  277                         ((u_char *)&sin->sin_addr)[i] = (u_char)val;
  278                         if (i < 3) {
  279                                 if (s[*off] != '.')
  280                                         return (EINVAL);
  281                                 (*off)++;
  282                         } else if (s[*off] == ':') {
  283                                 (*off)++;
  284                                 val = strtoul(s + *off, &eptr, 10);
  285                                 if (val > 0xffff || eptr == s + *off)
  286                                         return (EINVAL);
  287                                 *off += (eptr - (s + *off));
  288                                 sin->sin_port = htons(val);
  289                         } else
  290                                 sin->sin_port = 0;
  291                 }
  292                 bzero(&sin->sin_zero, sizeof(sin->sin_zero));
  293                 sin->sin_len = sizeof(*sin);
  294                 break;
  295             }
  296 
  297 #if 0
  298         case PF_INET6:  /* XXX implement this someday */
  299 #endif
  300 
  301         default:
  302                 return (EINVAL);
  303         }
  304 
  305         /* Done */
  306         *buflen = sa->sa_len;
  307         return (0);
  308 }
  309 
  310 /* Convert a struct sockaddr from binary to ASCII */
  311 static int
  312 ng_ksocket_sockaddr_unparse(const struct ng_parse_type *type,
  313         const u_char *data, int *off, char *cbuf, int cbuflen)
  314 {
  315         const struct sockaddr *sa = (const struct sockaddr *)(data + *off);
  316         int slen = 0;
  317 
  318         /* Output socket address, either in special or generic format */
  319         switch (sa->sa_family) {
  320         case PF_LOCAL:
  321             {
  322                 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
  323                 const struct sockaddr_un *sun = (const struct sockaddr_un *)sa;
  324                 const int pathlen = sun->sun_len - pathoff;
  325                 char pathbuf[SOCK_MAXADDRLEN + 1];
  326                 char *pathtoken;
  327 
  328                 bcopy(sun->sun_path, pathbuf, pathlen);
  329                 if ((pathtoken = ng_encode_string(pathbuf, pathlen)) == NULL)
  330                         return (ENOMEM);
  331                 slen += snprintf(cbuf, cbuflen, "local/%s", pathtoken);
  332                 free(pathtoken, M_NETGRAPH_KSOCKET);
  333                 if (slen >= cbuflen)
  334                         return (ERANGE);
  335                 *off += sun->sun_len;
  336                 return (0);
  337             }
  338 
  339         case PF_INET:
  340             {
  341                 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
  342 
  343                 slen += snprintf(cbuf, cbuflen, "inet/%d.%d.%d.%d",
  344                   ((const u_char *)&sin->sin_addr)[0],
  345                   ((const u_char *)&sin->sin_addr)[1],
  346                   ((const u_char *)&sin->sin_addr)[2],
  347                   ((const u_char *)&sin->sin_addr)[3]);
  348                 if (sin->sin_port != 0) {
  349                         slen += snprintf(cbuf + strlen(cbuf),
  350                             cbuflen - strlen(cbuf), ":%d",
  351                             (u_int)ntohs(sin->sin_port));
  352                 }
  353                 if (slen >= cbuflen)
  354                         return (ERANGE);
  355                 *off += sizeof(*sin);
  356                 return(0);
  357             }
  358 
  359 #if 0
  360         case PF_INET6:  /* XXX implement this someday */
  361 #endif
  362 
  363         default:
  364                 return (*ng_ksocket_generic_sockaddr_type.supertype->unparse)
  365                     (&ng_ksocket_generic_sockaddr_type,
  366                     data, off, cbuf, cbuflen);
  367         }
  368 }
  369 
  370 /* Parse type for struct sockaddr */
  371 static const struct ng_parse_type ng_ksocket_sockaddr_type = {
  372         NULL,
  373         NULL,
  374         NULL,
  375         &ng_ksocket_sockaddr_parse,
  376         &ng_ksocket_sockaddr_unparse,
  377         NULL            /* no such thing as a default struct sockaddr */
  378 };
  379 
  380 /************************************************************************
  381                 STRUCT NG_KSOCKET_SOCKOPT PARSE TYPE
  382  ************************************************************************/
  383 
  384 /* Get length of the struct ng_ksocket_sockopt value field, which is the
  385    just the excess of the message argument portion over the length of
  386    the struct ng_ksocket_sockopt. */
  387 static int
  388 ng_parse_sockoptval_getLength(const struct ng_parse_type *type,
  389         const u_char *start, const u_char *buf)
  390 {
  391         static const int offset = OFFSETOF(struct ng_ksocket_sockopt, value);
  392         const struct ng_ksocket_sockopt *sopt;
  393         const struct ng_mesg *msg;
  394 
  395         sopt = (const struct ng_ksocket_sockopt *)(buf - offset);
  396         msg = (const struct ng_mesg *)((const u_char *)sopt - sizeof(*msg));
  397         return msg->header.arglen - sizeof(*sopt);
  398 }
  399 
  400 /* Parse type for the option value part of a struct ng_ksocket_sockopt
  401    XXX Eventually, we should handle the different socket options specially.
  402    XXX This would avoid byte order problems, eg an integer value of 1 is
  403    XXX going to be "[1]" for little endian or "[3=1]" for big endian. */
  404 static const struct ng_parse_type ng_ksocket_sockoptval_type = {
  405         &ng_parse_bytearray_type,
  406         &ng_parse_sockoptval_getLength
  407 };
  408 
  409 /* Parse type for struct ng_ksocket_sockopt */
  410 static const struct ng_parse_struct_field ng_ksocket_sockopt_type_fields[]
  411         = NG_KSOCKET_SOCKOPT_INFO(&ng_ksocket_sockoptval_type);
  412 static const struct ng_parse_type ng_ksocket_sockopt_type = {
  413         &ng_parse_struct_type,
  414         &ng_ksocket_sockopt_type_fields
  415 };
  416 
  417 /* Parse type for struct ng_ksocket_accept */
  418 static const struct ng_parse_struct_field ng_ksocket_accept_type_fields[]
  419         = NGM_KSOCKET_ACCEPT_INFO;
  420 static const struct ng_parse_type ng_ksocket_accept_type = {
  421         &ng_parse_struct_type,
  422         &ng_ksocket_accept_type_fields
  423 };
  424 
  425 /* List of commands and how to convert arguments to/from ASCII */
  426 static const struct ng_cmdlist ng_ksocket_cmds[] = {
  427         {
  428           NGM_KSOCKET_COOKIE,
  429           NGM_KSOCKET_BIND,
  430           "bind",
  431           &ng_ksocket_sockaddr_type,
  432           NULL
  433         },
  434         {
  435           NGM_KSOCKET_COOKIE,
  436           NGM_KSOCKET_LISTEN,
  437           "listen",
  438           &ng_parse_int32_type,
  439           NULL
  440         },
  441         {
  442           NGM_KSOCKET_COOKIE,
  443           NGM_KSOCKET_ACCEPT,
  444           "accept",
  445           NULL,
  446           &ng_ksocket_accept_type
  447         },
  448         {
  449           NGM_KSOCKET_COOKIE,
  450           NGM_KSOCKET_CONNECT,
  451           "connect",
  452           &ng_ksocket_sockaddr_type,
  453           &ng_parse_int32_type
  454         },
  455         {
  456           NGM_KSOCKET_COOKIE,
  457           NGM_KSOCKET_GETNAME,
  458           "getname",
  459           NULL,
  460           &ng_ksocket_sockaddr_type
  461         },
  462         {
  463           NGM_KSOCKET_COOKIE,
  464           NGM_KSOCKET_GETPEERNAME,
  465           "getpeername",
  466           NULL,
  467           &ng_ksocket_sockaddr_type
  468         },
  469         {
  470           NGM_KSOCKET_COOKIE,
  471           NGM_KSOCKET_SETOPT,
  472           "setopt",
  473           &ng_ksocket_sockopt_type,
  474           NULL
  475         },
  476         {
  477           NGM_KSOCKET_COOKIE,
  478           NGM_KSOCKET_GETOPT,
  479           "getopt",
  480           &ng_ksocket_sockopt_type,
  481           &ng_ksocket_sockopt_type
  482         },
  483         { 0 }
  484 };
  485 
  486 /* Node type descriptor */
  487 static struct ng_type ng_ksocket_typestruct = {
  488         .version =      NG_ABI_VERSION,
  489         .name =         NG_KSOCKET_NODE_TYPE,
  490         .constructor =  ng_ksocket_constructor,
  491         .rcvmsg =       ng_ksocket_rcvmsg,
  492         .shutdown =     ng_ksocket_shutdown,
  493         .newhook =      ng_ksocket_newhook,
  494         .connect =      ng_ksocket_connect,
  495         .rcvdata =      ng_ksocket_rcvdata,
  496         .disconnect =   ng_ksocket_disconnect,
  497         .cmdlist =      ng_ksocket_cmds,
  498 };
  499 NETGRAPH_INIT(ksocket, &ng_ksocket_typestruct);
  500 
  501 #define ERROUT(x)       do { error = (x); goto done; } while (0)
  502 
  503 /************************************************************************
  504                         NETGRAPH NODE STUFF
  505  ************************************************************************/
  506 
  507 /*
  508  * Node type constructor
  509  * The NODE part is assumed to be all set up.
  510  * There is already a reference to the node for us.
  511  */
  512 static int
  513 ng_ksocket_constructor(node_p node)
  514 {
  515         priv_p priv;
  516 
  517         /* Allocate private structure */
  518         priv = malloc(sizeof(*priv), M_NETGRAPH_KSOCKET, M_NOWAIT | M_ZERO);
  519         if (priv == NULL)
  520                 return (ENOMEM);
  521 
  522         LIST_INIT(&priv->embryos);
  523         /* cross link them */
  524         priv->node = node;
  525         NG_NODE_SET_PRIVATE(node, priv);
  526 
  527         /* Done */
  528         return (0);
  529 }
  530 
  531 /*
  532  * Give our OK for a hook to be added. The hook name is of the
  533  * form "<family>/<type>/<proto>" where the three components may
  534  * be decimal numbers or else aliases from the above lists.
  535  *
  536  * Connecting a hook amounts to opening the socket.  Disconnecting
  537  * the hook closes the socket and destroys the node as well.
  538  */
  539 static int
  540 ng_ksocket_newhook(node_p node, hook_p hook, const char *name0)
  541 {
  542         struct thread *td = curthread;  /* XXX broken */
  543         const priv_p priv = NG_NODE_PRIVATE(node);
  544         char *s1, *s2, name[NG_HOOKSIZ];
  545         int family, type, protocol, error;
  546 
  547         /* Check if we're already connected */
  548         if (priv->hook != NULL)
  549                 return (EISCONN);
  550 
  551         if (priv->flags & KSF_CLONED) {
  552                 if (priv->flags & KSF_EMBRYONIC) {
  553                         /* Remove ourselves from our parent's embryo list */
  554                         LIST_REMOVE(priv, siblings);
  555                         priv->flags &= ~KSF_EMBRYONIC;
  556                 }
  557         } else {
  558                 /* Extract family, type, and protocol from hook name */
  559                 snprintf(name, sizeof(name), "%s", name0);
  560                 s1 = name;
  561                 if ((s2 = strchr(s1, '/')) == NULL)
  562                         return (EINVAL);
  563                 *s2++ = '\0';
  564                 family = ng_ksocket_parse(ng_ksocket_families, s1, 0);
  565                 if (family == -1)
  566                         return (EINVAL);
  567                 s1 = s2;
  568                 if ((s2 = strchr(s1, '/')) == NULL)
  569                         return (EINVAL);
  570                 *s2++ = '\0';
  571                 type = ng_ksocket_parse(ng_ksocket_types, s1, 0);
  572                 if (type == -1)
  573                         return (EINVAL);
  574                 s1 = s2;
  575                 protocol = ng_ksocket_parse(ng_ksocket_protos, s1, family);
  576                 if (protocol == -1)
  577                         return (EINVAL);
  578 
  579                 /* Create the socket */
  580                 error = socreate(family, &priv->so, type, protocol,
  581                    td->td_ucred, td);
  582                 if (error != 0)
  583                         return (error);
  584 
  585                 /* XXX call soreserve() ? */
  586 
  587         }
  588 
  589         /* OK */
  590         priv->hook = hook;
  591 
  592         /*
  593          * In case of misconfigured routing a packet may reenter
  594          * ksocket node recursively. Decouple stack to avoid possible
  595          * panics about sleeping with locks held.
  596          */
  597         NG_HOOK_FORCE_QUEUE(hook);
  598 
  599         return(0);
  600 }
  601 
  602 static int
  603 ng_ksocket_connect(hook_p hook)
  604 {
  605         node_p node = NG_HOOK_NODE(hook);
  606         const priv_p priv = NG_NODE_PRIVATE(node);
  607         struct socket *const so = priv->so;
  608 
  609         /* Add our hook for incoming data and other events */
  610         SOCKBUF_LOCK(&priv->so->so_rcv);
  611         soupcall_set(priv->so, SO_RCV, ng_ksocket_incoming, node);
  612         SOCKBUF_UNLOCK(&priv->so->so_rcv);
  613         SOCKBUF_LOCK(&priv->so->so_snd);
  614         soupcall_set(priv->so, SO_SND, ng_ksocket_incoming, node);
  615         SOCKBUF_UNLOCK(&priv->so->so_snd);
  616         SOCK_LOCK(priv->so);
  617         priv->so->so_state |= SS_NBIO;
  618         SOCK_UNLOCK(priv->so);
  619         /*
  620          * --Original comment--
  621          * On a cloned socket we may have already received one or more
  622          * upcalls which we couldn't handle without a hook.  Handle
  623          * those now.
  624          * We cannot call the upcall function directly
  625          * from here, because until this function has returned our
  626          * hook isn't connected.
  627          *
  628          * ---meta comment for -current ---
  629          * XXX This is dubius.
  630          * Upcalls between the time that the hook was
  631          * first created and now (on another processesor) will
  632          * be earlier on the queue than the request to finalise the hook.
  633          * By the time the hook is finalised,
  634          * The queued upcalls will have happened and the code
  635          * will have discarded them because of a lack of a hook.
  636          * (socket not open).
  637          *
  638          * This is a bad byproduct of the complicated way in which hooks
  639          * are now created (3 daisy chained async events).
  640          *
  641          * Since we are a netgraph operation
  642          * We know that we hold a lock on this node. This forces the
  643          * request we make below to be queued rather than implemented
  644          * immediately which will cause the upcall function to be called a bit
  645          * later.
  646          * However, as we will run any waiting queued operations immediately
  647          * after doing this one, if we have not finalised the other end
  648          * of the hook, those queued operations will fail.
  649          */
  650         if (priv->flags & KSF_CLONED) {
  651                 ng_send_fn(node, NULL, &ng_ksocket_incoming2, so, M_NOWAIT);
  652         }
  653 
  654         return (0);
  655 }
  656 
  657 /*
  658  * Receive a control message
  659  */
  660 static int
  661 ng_ksocket_rcvmsg(node_p node, item_p item, hook_p lasthook)
  662 {
  663         struct thread *td = curthread;  /* XXX broken */
  664         const priv_p priv = NG_NODE_PRIVATE(node);
  665         struct socket *const so = priv->so;
  666         struct ng_mesg *resp = NULL;
  667         int error = 0;
  668         struct ng_mesg *msg;
  669         ng_ID_t raddr;
  670 
  671         NGI_GET_MSG(item, msg);
  672         switch (msg->header.typecookie) {
  673         case NGM_KSOCKET_COOKIE:
  674                 switch (msg->header.cmd) {
  675                 case NGM_KSOCKET_BIND:
  676                     {
  677                         struct sockaddr *const sa
  678                             = (struct sockaddr *)msg->data;
  679 
  680                         /* Sanity check */
  681                         if (msg->header.arglen < SADATA_OFFSET
  682                             || msg->header.arglen < sa->sa_len)
  683                                 ERROUT(EINVAL);
  684                         if (so == NULL)
  685                                 ERROUT(ENXIO);
  686 
  687                         /* Bind */
  688                         error = sobind(so, sa, td);
  689                         break;
  690                     }
  691                 case NGM_KSOCKET_LISTEN:
  692                     {
  693                         /* Sanity check */
  694                         if (msg->header.arglen != sizeof(int32_t))
  695                                 ERROUT(EINVAL);
  696                         if (so == NULL)
  697                                 ERROUT(ENXIO);
  698 
  699                         /* Listen */
  700                         so->so_state |= SS_NBIO;
  701                         error = solisten(so, *((int32_t *)msg->data), td);
  702                         break;
  703                     }
  704 
  705                 case NGM_KSOCKET_ACCEPT:
  706                     {
  707                         /* Sanity check */
  708                         if (msg->header.arglen != 0)
  709                                 ERROUT(EINVAL);
  710                         if (so == NULL)
  711                                 ERROUT(ENXIO);
  712 
  713                         /* Make sure the socket is capable of accepting */
  714                         if (!(so->so_options & SO_ACCEPTCONN))
  715                                 ERROUT(EINVAL);
  716                         if (priv->flags & KSF_ACCEPTING)
  717                                 ERROUT(EALREADY);
  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                         error = ng_ksocket_accept(priv);
  725                         if (error != 0 && error != EWOULDBLOCK)
  726                                 ERROUT(error);
  727                         priv->response_token = msg->header.token;
  728                         raddr = priv->response_addr = NGI_RETADDR(item);
  729                         break;
  730                     }
  731 
  732                 case NGM_KSOCKET_CONNECT:
  733                     {
  734                         struct sockaddr *const sa
  735                             = (struct sockaddr *)msg->data;
  736 
  737                         /* Sanity check */
  738                         if (msg->header.arglen < SADATA_OFFSET
  739                             || msg->header.arglen < sa->sa_len)
  740                                 ERROUT(EINVAL);
  741                         if (so == NULL)
  742                                 ERROUT(ENXIO);
  743 
  744                         /* Do connect */
  745                         if ((so->so_state & SS_ISCONNECTING) != 0)
  746                                 ERROUT(EALREADY);
  747                         if ((error = soconnect(so, sa, td)) != 0) {
  748                                 so->so_state &= ~SS_ISCONNECTING;
  749                                 ERROUT(error);
  750                         }
  751                         if ((so->so_state & SS_ISCONNECTING) != 0) {
  752                                 /* We will notify the sender when we connect */
  753                                 priv->response_token = msg->header.token;
  754                                 raddr = priv->response_addr = NGI_RETADDR(item);
  755                                 priv->flags |= KSF_CONNECTING;
  756                                 ERROUT(EINPROGRESS);
  757                         }
  758                         break;
  759                     }
  760 
  761                 case NGM_KSOCKET_GETNAME:
  762                 case NGM_KSOCKET_GETPEERNAME:
  763                     {
  764                         int (*func)(struct socket *so, struct sockaddr **nam);
  765                         struct sockaddr *sa = NULL;
  766                         int len;
  767 
  768                         /* Sanity check */
  769                         if (msg->header.arglen != 0)
  770                                 ERROUT(EINVAL);
  771                         if (so == NULL)
  772                                 ERROUT(ENXIO);
  773 
  774                         /* Get function */
  775                         if (msg->header.cmd == NGM_KSOCKET_GETPEERNAME) {
  776                                 if ((so->so_state
  777                                     & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0)
  778                                         ERROUT(ENOTCONN);
  779                                 func = so->so_proto->pr_usrreqs->pru_peeraddr;
  780                         } else
  781                                 func = so->so_proto->pr_usrreqs->pru_sockaddr;
  782 
  783                         /* Get local or peer address */
  784                         if ((error = (*func)(so, &sa)) != 0)
  785                                 goto bail;
  786                         len = (sa == NULL) ? 0 : sa->sa_len;
  787 
  788                         /* Send it back in a response */
  789                         NG_MKRESPONSE(resp, msg, len, M_NOWAIT);
  790                         if (resp == NULL) {
  791                                 error = ENOMEM;
  792                                 goto bail;
  793                         }
  794                         bcopy(sa, resp->data, len);
  795 
  796                 bail:
  797                         /* Cleanup */
  798                         if (sa != NULL)
  799                                 free(sa, M_SONAME);
  800                         break;
  801                     }
  802 
  803                 case NGM_KSOCKET_GETOPT:
  804                     {
  805                         struct ng_ksocket_sockopt *ksopt =
  806                             (struct ng_ksocket_sockopt *)msg->data;
  807                         struct sockopt sopt;
  808 
  809                         /* Sanity check */
  810                         if (msg->header.arglen != sizeof(*ksopt))
  811                                 ERROUT(EINVAL);
  812                         if (so == NULL)
  813                                 ERROUT(ENXIO);
  814 
  815                         /* Get response with room for option value */
  816                         NG_MKRESPONSE(resp, msg, sizeof(*ksopt)
  817                             + NG_KSOCKET_MAX_OPTLEN, M_NOWAIT);
  818                         if (resp == NULL)
  819                                 ERROUT(ENOMEM);
  820 
  821                         /* Get socket option, and put value in the response */
  822                         sopt.sopt_dir = SOPT_GET;
  823                         sopt.sopt_level = ksopt->level;
  824                         sopt.sopt_name = ksopt->name;
  825                         sopt.sopt_td = NULL;
  826                         sopt.sopt_valsize = NG_KSOCKET_MAX_OPTLEN;
  827                         ksopt = (struct ng_ksocket_sockopt *)resp->data;
  828                         sopt.sopt_val = ksopt->value;
  829                         if ((error = sogetopt(so, &sopt)) != 0) {
  830                                 NG_FREE_MSG(resp);
  831                                 break;
  832                         }
  833 
  834                         /* Set actual value length */
  835                         resp->header.arglen = sizeof(*ksopt)
  836                             + sopt.sopt_valsize;
  837                         break;
  838                     }
  839 
  840                 case NGM_KSOCKET_SETOPT:
  841                     {
  842                         struct ng_ksocket_sockopt *const ksopt =
  843                             (struct ng_ksocket_sockopt *)msg->data;
  844                         const int valsize = msg->header.arglen - sizeof(*ksopt);
  845                         struct sockopt sopt;
  846 
  847                         /* Sanity check */
  848                         if (valsize < 0)
  849                                 ERROUT(EINVAL);
  850                         if (so == NULL)
  851                                 ERROUT(ENXIO);
  852 
  853                         /* Set socket option */
  854                         sopt.sopt_dir = SOPT_SET;
  855                         sopt.sopt_level = ksopt->level;
  856                         sopt.sopt_name = ksopt->name;
  857                         sopt.sopt_val = ksopt->value;
  858                         sopt.sopt_valsize = valsize;
  859                         sopt.sopt_td = NULL;
  860                         error = sosetopt(so, &sopt);
  861                         break;
  862                     }
  863 
  864                 default:
  865                         error = EINVAL;
  866                         break;
  867                 }
  868                 break;
  869         default:
  870                 error = EINVAL;
  871                 break;
  872         }
  873 done:
  874         NG_RESPOND_MSG(error, node, item, resp);
  875         NG_FREE_MSG(msg);
  876         return (error);
  877 }
  878 
  879 /*
  880  * Receive incoming data on our hook.  Send it out the socket.
  881  */
  882 static int
  883 ng_ksocket_rcvdata(hook_p hook, item_p item)
  884 {
  885         struct thread *td = curthread;  /* XXX broken */
  886         const node_p node = NG_HOOK_NODE(hook);
  887         const priv_p priv = NG_NODE_PRIVATE(node);
  888         struct socket *const so = priv->so;
  889         struct sockaddr *sa = NULL;
  890         int error;
  891         struct mbuf *m;
  892 #ifdef ALIGNED_POINTER
  893         struct mbuf *n;
  894 #endif /* ALIGNED_POINTER */
  895         struct sa_tag *stag;
  896 
  897         /* Extract data */
  898         NGI_GET_M(item, m);
  899         NG_FREE_ITEM(item);
  900 #ifdef ALIGNED_POINTER
  901         if (!ALIGNED_POINTER(mtod(m, caddr_t), uint32_t)) {
  902                 n = m_defrag(m, M_NOWAIT);
  903                 if (n == NULL) {
  904                         m_freem(m);
  905                         return (ENOBUFS);
  906                 }
  907                 m = n;
  908         }
  909 #endif /* ALIGNED_POINTER */
  910         /*
  911          * Look if socket address is stored in packet tags.
  912          * If sockaddr is ours, or provided by a third party (zero id),
  913          * then we accept it.
  914          */
  915         if (((stag = (struct sa_tag *)m_tag_locate(m, NGM_KSOCKET_COOKIE,
  916             NG_KSOCKET_TAG_SOCKADDR, NULL)) != NULL) &&
  917             (stag->id == NG_NODE_ID(node) || stag->id == 0))
  918                 sa = &stag->sa;
  919 
  920         /* Reset specific mbuf flags to prevent addressing problems. */
  921         m->m_flags &= ~(M_BCAST|M_MCAST);
  922 
  923         /* Send packet */
  924         error = sosend(so, sa, 0, m, 0, 0, td);
  925 
  926         return (error);
  927 }
  928 
  929 /*
  930  * Destroy node
  931  */
  932 static int
  933 ng_ksocket_shutdown(node_p node)
  934 {
  935         const priv_p priv = NG_NODE_PRIVATE(node);
  936         priv_p embryo;
  937 
  938         /* Close our socket (if any) */
  939         if (priv->so != NULL) {
  940                 SOCKBUF_LOCK(&priv->so->so_rcv);
  941                 soupcall_clear(priv->so, SO_RCV);
  942                 SOCKBUF_UNLOCK(&priv->so->so_rcv);
  943                 SOCKBUF_LOCK(&priv->so->so_snd);
  944                 soupcall_clear(priv->so, SO_SND);
  945                 SOCKBUF_UNLOCK(&priv->so->so_snd);
  946                 soclose(priv->so);
  947                 priv->so = NULL;
  948         }
  949 
  950         /* If we are an embryo, take ourselves out of the parent's list */
  951         if (priv->flags & KSF_EMBRYONIC) {
  952                 LIST_REMOVE(priv, siblings);
  953                 priv->flags &= ~KSF_EMBRYONIC;
  954         }
  955 
  956         /* Remove any embryonic children we have */
  957         while (!LIST_EMPTY(&priv->embryos)) {
  958                 embryo = LIST_FIRST(&priv->embryos);
  959                 ng_rmnode_self(embryo->node);
  960         }
  961 
  962         /* Take down netgraph node */
  963         bzero(priv, sizeof(*priv));
  964         free(priv, M_NETGRAPH_KSOCKET);
  965         NG_NODE_SET_PRIVATE(node, NULL);
  966         NG_NODE_UNREF(node);            /* let the node escape */
  967         return (0);
  968 }
  969 
  970 /*
  971  * Hook disconnection
  972  */
  973 static int
  974 ng_ksocket_disconnect(hook_p hook)
  975 {
  976         KASSERT(NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0,
  977             ("%s: numhooks=%d?", __func__,
  978             NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook))));
  979         if (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))
  980                 ng_rmnode_self(NG_HOOK_NODE(hook));
  981         return (0);
  982 }
  983 
  984 /************************************************************************
  985                         HELPER STUFF
  986  ************************************************************************/
  987 /*
  988  * You should not "just call" a netgraph node function from an external
  989  * asynchronous event. This is because in doing so you are ignoring the
  990  * locking on the netgraph nodes. Instead call your function via ng_send_fn().
  991  * This will call the function you chose, but will first do all the
  992  * locking rigmarole. Your function MAY only be called at some distant future
  993  * time (several millisecs away) so don't give it any arguments
  994  * that may be revoked soon (e.g. on your stack).
  995  *
  996  * To decouple stack, we use queue version of ng_send_fn().
  997  */
  998 
  999 static int
 1000 ng_ksocket_incoming(struct socket *so, void *arg, int waitflag)
 1001 {
 1002         const node_p node = arg;
 1003         const priv_p priv = NG_NODE_PRIVATE(node);
 1004         int wait = ((waitflag & M_WAITOK) ? NG_WAITOK : 0) | NG_QUEUE;
 1005 
 1006         /*
 1007          * Even if node is not locked, as soon as we are called, we assume
 1008          * it exist and it's private area is valid. With some care we can
 1009          * access it. Mark node that incoming event for it was sent to
 1010          * avoid unneded queue trashing.
 1011          */
 1012         if (atomic_cmpset_int(&priv->fn_sent, 0, 1) &&
 1013             ng_send_fn1(node, NULL, &ng_ksocket_incoming2, so, 0, wait)) {
 1014                 atomic_store_rel_int(&priv->fn_sent, 0);
 1015         }
 1016         return (SU_OK);
 1017 }
 1018 
 1019 
 1020 /*
 1021  * When incoming data is appended to the socket, we get notified here.
 1022  * This is also called whenever a significant event occurs for the socket.
 1023  * Our original caller may have queued this even some time ago and
 1024  * we cannot trust that he even still exists. The node however is being
 1025  * held with a reference by the queueing code and guarantied to be valid.
 1026  */
 1027 static void
 1028 ng_ksocket_incoming2(node_p node, hook_p hook, void *arg1, int arg2)
 1029 {
 1030         struct socket *so = arg1;
 1031         const priv_p priv = NG_NODE_PRIVATE(node);
 1032         struct ng_mesg *response;
 1033         int error;
 1034 
 1035         KASSERT(so == priv->so, ("%s: wrong socket", __func__));
 1036 
 1037         /* Allow next incoming event to be queued. */
 1038         atomic_store_rel_int(&priv->fn_sent, 0);
 1039 
 1040         /* Check whether a pending connect operation has completed */
 1041         if (priv->flags & KSF_CONNECTING) {
 1042                 if ((error = so->so_error) != 0) {
 1043                         so->so_error = 0;
 1044                         so->so_state &= ~SS_ISCONNECTING;
 1045                 }
 1046                 if (!(so->so_state & SS_ISCONNECTING)) {
 1047                         NG_MKMESSAGE(response, NGM_KSOCKET_COOKIE,
 1048                             NGM_KSOCKET_CONNECT, sizeof(int32_t), M_NOWAIT);
 1049                         if (response != NULL) {
 1050                                 response->header.flags |= NGF_RESP;
 1051                                 response->header.token = priv->response_token;
 1052                                 *(int32_t *)response->data = error;
 1053                                 /*
 1054                                  * send an async "response" message
 1055                                  * to the node that set us up
 1056                                  * (if it still exists)
 1057                                  */
 1058                                 NG_SEND_MSG_ID(error, node,
 1059                                     response, priv->response_addr, 0);
 1060                         }
 1061                         priv->flags &= ~KSF_CONNECTING;
 1062                 }
 1063         }
 1064 
 1065         /* Check whether a pending accept operation has completed */
 1066         if (priv->flags & KSF_ACCEPTING)
 1067                 (void )ng_ksocket_accept(priv);
 1068 
 1069         /*
 1070          * If we don't have a hook, we must handle data events later.  When
 1071          * the hook gets created and is connected, this upcall function
 1072          * will be called again.
 1073          */
 1074         if (priv->hook == NULL)
 1075                 return;
 1076 
 1077         /* Read and forward available mbufs. */
 1078         while (1) {
 1079                 struct uio uio;
 1080                 struct sockaddr *sa;
 1081                 struct mbuf *m;
 1082                 int flags;
 1083 
 1084                 /* Try to get next packet from socket. */
 1085                 uio.uio_td = NULL;
 1086                 uio.uio_resid = IP_MAXPACKET;
 1087                 flags = MSG_DONTWAIT;
 1088                 sa = NULL;
 1089                 if ((error = soreceive(so, (so->so_state & SS_ISCONNECTED) ?
 1090                     NULL : &sa, &uio, &m, NULL, &flags)) != 0)
 1091                         break;
 1092 
 1093                 /* See if we got anything. */
 1094                 if (flags & MSG_TRUNC) {
 1095                         m_freem(m);
 1096                         m = NULL;
 1097                 }
 1098                 if (m == NULL) {
 1099                         if (sa != NULL)
 1100                                 free(sa, M_SONAME);
 1101                         break;
 1102                 }
 1103 
 1104                 KASSERT(m->m_nextpkt == NULL, ("%s: nextpkt", __func__));
 1105 
 1106                 /*
 1107                  * Stream sockets do not have packet boundaries, so
 1108                  * we have to allocate a header mbuf and attach the
 1109                  * stream of data to it.
 1110                  */
 1111                 if (so->so_type == SOCK_STREAM) {
 1112                         struct mbuf *mh;
 1113 
 1114                         mh = m_gethdr(M_NOWAIT, MT_DATA);
 1115                         if (mh == NULL) {
 1116                                 m_freem(m);
 1117                                 if (sa != NULL)
 1118                                         free(sa, M_SONAME);
 1119                                 break;
 1120                         }
 1121 
 1122                         mh->m_next = m;
 1123                         for (; m; m = m->m_next)
 1124                                 mh->m_pkthdr.len += m->m_len;
 1125                         m = mh;
 1126                 }
 1127 
 1128                 /* Put peer's socket address (if any) into a tag */
 1129                 if (sa != NULL) {
 1130                         struct sa_tag   *stag;
 1131 
 1132                         stag = (struct sa_tag *)m_tag_alloc(NGM_KSOCKET_COOKIE,
 1133                             NG_KSOCKET_TAG_SOCKADDR, sizeof(ng_ID_t) +
 1134                             sa->sa_len, M_NOWAIT);
 1135                         if (stag == NULL) {
 1136                                 free(sa, M_SONAME);
 1137                                 goto sendit;
 1138                         }
 1139                         bcopy(sa, &stag->sa, sa->sa_len);
 1140                         free(sa, M_SONAME);
 1141                         stag->id = NG_NODE_ID(node);
 1142                         m_tag_prepend(m, &stag->tag);
 1143                 }
 1144 
 1145 sendit:         /* Forward data with optional peer sockaddr as packet tag */
 1146                 NG_SEND_DATA_ONLY(error, priv->hook, m);
 1147         }
 1148 
 1149         /*
 1150          * If the peer has closed the connection, forward a 0-length mbuf
 1151          * to indicate end-of-file.
 1152          */
 1153         if (so->so_rcv.sb_state & SBS_CANTRCVMORE &&
 1154             !(priv->flags & KSF_EOFSEEN)) {
 1155                 struct mbuf *m;
 1156 
 1157                 m = m_gethdr(M_NOWAIT, MT_DATA);
 1158                 if (m != NULL)
 1159                         NG_SEND_DATA_ONLY(error, priv->hook, m);
 1160                 priv->flags |= KSF_EOFSEEN;
 1161         }
 1162 }
 1163 
 1164 static int
 1165 ng_ksocket_accept(priv_p priv)
 1166 {
 1167         struct socket *const head = priv->so;
 1168         struct socket *so;
 1169         struct sockaddr *sa = NULL;
 1170         struct ng_mesg *resp;
 1171         struct ng_ksocket_accept *resp_data;
 1172         node_p node;
 1173         priv_p priv2;
 1174         int len;
 1175         int error;
 1176 
 1177         SOLISTEN_LOCK(head);
 1178         error = solisten_dequeue(head, &so, SOCK_NONBLOCK);
 1179         if (error == EWOULDBLOCK) {
 1180                 priv->flags |= KSF_ACCEPTING;
 1181                 return (error);
 1182         }
 1183         priv->flags &= ~KSF_ACCEPTING;
 1184         if (error)
 1185                 return (error);
 1186 
 1187         if ((error = soaccept(so, &sa)) != 0)
 1188                 return (error);
 1189 
 1190         len = OFFSETOF(struct ng_ksocket_accept, addr);
 1191         if (sa != NULL)
 1192                 len += sa->sa_len;
 1193 
 1194         NG_MKMESSAGE(resp, NGM_KSOCKET_COOKIE, NGM_KSOCKET_ACCEPT, len,
 1195             M_NOWAIT);
 1196         if (resp == NULL) {
 1197                 soclose(so);
 1198                 goto out;
 1199         }
 1200         resp->header.flags |= NGF_RESP;
 1201         resp->header.token = priv->response_token;
 1202 
 1203         /* Clone a ksocket node to wrap the new socket */
 1204         error = ng_make_node_common(&ng_ksocket_typestruct, &node);
 1205         if (error) {
 1206                 free(resp, M_NETGRAPH);
 1207                 soclose(so);
 1208                 goto out;
 1209         }
 1210 
 1211         if (ng_ksocket_constructor(node) != 0) {
 1212                 NG_NODE_UNREF(node);
 1213                 free(resp, M_NETGRAPH);
 1214                 soclose(so);
 1215                 goto out;
 1216         }
 1217 
 1218         priv2 = NG_NODE_PRIVATE(node);
 1219         priv2->so = so;
 1220         priv2->flags |= KSF_CLONED | KSF_EMBRYONIC;
 1221 
 1222         /*
 1223          * Insert the cloned node into a list of embryonic children
 1224          * on the parent node.  When a hook is created on the cloned
 1225          * node it will be removed from this list.  When the parent
 1226          * is destroyed it will destroy any embryonic children it has.
 1227          */
 1228         LIST_INSERT_HEAD(&priv->embryos, priv2, siblings);
 1229 
 1230         SOCKBUF_LOCK(&so->so_rcv);
 1231         soupcall_set(so, SO_RCV, ng_ksocket_incoming, node);
 1232         SOCKBUF_UNLOCK(&so->so_rcv);
 1233         SOCKBUF_LOCK(&so->so_snd);
 1234         soupcall_set(so, SO_SND, ng_ksocket_incoming, node);
 1235         SOCKBUF_UNLOCK(&so->so_snd);
 1236 
 1237         /* Fill in the response data and send it or return it to the caller */
 1238         resp_data = (struct ng_ksocket_accept *)resp->data;
 1239         resp_data->nodeid = NG_NODE_ID(node);
 1240         if (sa != NULL)
 1241                 bcopy(sa, &resp_data->addr, sa->sa_len);
 1242         NG_SEND_MSG_ID(error, node, resp, priv->response_addr, 0);
 1243 
 1244 out:
 1245         if (sa != NULL)
 1246                 free(sa, M_SONAME);
 1247 
 1248         return (0);
 1249 }
 1250 
 1251 /*
 1252  * Parse out either an integer value or an alias.
 1253  */
 1254 static int
 1255 ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
 1256         const char *s, int family)
 1257 {
 1258         int k, val;
 1259         char *eptr;
 1260 
 1261         /* Try aliases */
 1262         for (k = 0; aliases[k].name != NULL; k++) {
 1263                 if (strcmp(s, aliases[k].name) == 0
 1264                     && aliases[k].family == family)
 1265                         return aliases[k].value;
 1266         }
 1267 
 1268         /* Try parsing as a number */
 1269         val = (int)strtoul(s, &eptr, 10);
 1270         if (val < 0 || *eptr != '\0')
 1271                 return (-1);
 1272         return (val);
 1273 }
 1274 

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