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/8.3/sys/netgraph/ng_ksocket.c 206660 2010-04-15 12:41:36Z mav $
   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 <netatalk/at.h>
   70 
   71 #ifdef NG_SEPARATE_MALLOC
   72 MALLOC_DEFINE(M_NETGRAPH_KSOCKET, "netgraph_ksock", "netgraph ksock node ");
   73 #else
   74 #define M_NETGRAPH_KSOCKET M_NETGRAPH
   75 #endif
   76 
   77 #define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0))
   78 #define SADATA_OFFSET   (OFFSETOF(struct sockaddr, sa_data))
   79 
   80 /* Node private data */
   81 struct ng_ksocket_private {
   82         node_p          node;
   83         hook_p          hook;
   84         struct socket   *so;
   85         int             fn_sent;        /* FN call on incoming event was sent */
   86         LIST_HEAD(, ng_ksocket_private) embryos;
   87         LIST_ENTRY(ng_ksocket_private)  siblings;
   88         u_int32_t       flags;
   89         u_int32_t       response_token;
   90         ng_ID_t         response_addr;
   91 };
   92 typedef struct ng_ksocket_private *priv_p;
   93 
   94 /* Flags for priv_p */
   95 #define KSF_CONNECTING  0x00000001      /* Waiting for connection complete */
   96 #define KSF_ACCEPTING   0x00000002      /* Waiting for accept complete */
   97 #define KSF_EOFSEEN     0x00000004      /* Have sent 0-length EOF mbuf */
   98 #define KSF_CLONED      0x00000008      /* Cloned from an accepting socket */
   99 #define KSF_EMBRYONIC   0x00000010      /* Cloned node with no hooks yet */
  100 
  101 /* Netgraph node methods */
  102 static ng_constructor_t ng_ksocket_constructor;
  103 static ng_rcvmsg_t      ng_ksocket_rcvmsg;
  104 static ng_shutdown_t    ng_ksocket_shutdown;
  105 static ng_newhook_t     ng_ksocket_newhook;
  106 static ng_rcvdata_t     ng_ksocket_rcvdata;
  107 static ng_connect_t     ng_ksocket_connect;
  108 static ng_disconnect_t  ng_ksocket_disconnect;
  109 
  110 /* Alias structure */
  111 struct ng_ksocket_alias {
  112         const char      *name;
  113         const int       value;
  114         const int       family;
  115 };
  116 
  117 /* Protocol family aliases */
  118 static const struct ng_ksocket_alias ng_ksocket_families[] = {
  119         { "local",      PF_LOCAL        },
  120         { "inet",       PF_INET         },
  121         { "inet6",      PF_INET6        },
  122         { "atalk",      PF_APPLETALK    },
  123         { "ipx",        PF_IPX          },
  124         { "atm",        PF_ATM          },
  125         { NULL,         -1              },
  126 };
  127 
  128 /* Socket type aliases */
  129 static const struct ng_ksocket_alias ng_ksocket_types[] = {
  130         { "stream",     SOCK_STREAM     },
  131         { "dgram",      SOCK_DGRAM      },
  132         { "raw",        SOCK_RAW        },
  133         { "rdm",        SOCK_RDM        },
  134         { "seqpacket",  SOCK_SEQPACKET  },
  135         { NULL,         -1              },
  136 };
  137 
  138 /* Protocol aliases */
  139 static const struct ng_ksocket_alias ng_ksocket_protos[] = {
  140         { "ip",         IPPROTO_IP,             PF_INET         },
  141         { "raw",        IPPROTO_RAW,            PF_INET         },
  142         { "icmp",       IPPROTO_ICMP,           PF_INET         },
  143         { "igmp",       IPPROTO_IGMP,           PF_INET         },
  144         { "tcp",        IPPROTO_TCP,            PF_INET         },
  145         { "udp",        IPPROTO_UDP,            PF_INET         },
  146         { "gre",        IPPROTO_GRE,            PF_INET         },
  147         { "esp",        IPPROTO_ESP,            PF_INET         },
  148         { "ah",         IPPROTO_AH,             PF_INET         },
  149         { "swipe",      IPPROTO_SWIPE,          PF_INET         },
  150         { "encap",      IPPROTO_ENCAP,          PF_INET         },
  151         { "divert",     IPPROTO_DIVERT,         PF_INET         },
  152         { "pim",        IPPROTO_PIM,            PF_INET         },
  153         { "ddp",        ATPROTO_DDP,            PF_APPLETALK    },
  154         { "aarp",       ATPROTO_AARP,           PF_APPLETALK    },
  155         { NULL,         -1                                      },
  156 };
  157 
  158 /* Helper functions */
  159 static int      ng_ksocket_check_accept(priv_p);
  160 static void     ng_ksocket_finish_accept(priv_p);
  161 static int      ng_ksocket_incoming(struct socket *so, void *arg, int waitflag);
  162 static int      ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
  163                         const char *s, int family);
  164 static void     ng_ksocket_incoming2(node_p node, hook_p hook,
  165                         void *arg1, int arg2);
  166 
  167 /************************************************************************
  168                         STRUCT SOCKADDR PARSE TYPE
  169  ************************************************************************/
  170 
  171 /* Get the length of the data portion of a generic struct sockaddr */
  172 static int
  173 ng_parse_generic_sockdata_getLength(const struct ng_parse_type *type,
  174         const u_char *start, const u_char *buf)
  175 {
  176         const struct sockaddr *sa;
  177 
  178         sa = (const struct sockaddr *)(buf - SADATA_OFFSET);
  179         return (sa->sa_len < SADATA_OFFSET) ? 0 : sa->sa_len - SADATA_OFFSET;
  180 }
  181 
  182 /* Type for the variable length data portion of a generic struct sockaddr */
  183 static const struct ng_parse_type ng_ksocket_generic_sockdata_type = {
  184         &ng_parse_bytearray_type,
  185         &ng_parse_generic_sockdata_getLength
  186 };
  187 
  188 /* Type for a generic struct sockaddr */
  189 static const struct ng_parse_struct_field
  190     ng_parse_generic_sockaddr_type_fields[] = {
  191           { "len",      &ng_parse_uint8_type                    },
  192           { "family",   &ng_parse_uint8_type                    },
  193           { "data",     &ng_ksocket_generic_sockdata_type       },
  194           { NULL }
  195 };
  196 static const struct ng_parse_type ng_ksocket_generic_sockaddr_type = {
  197         &ng_parse_struct_type,
  198         &ng_parse_generic_sockaddr_type_fields
  199 };
  200 
  201 /* Convert a struct sockaddr from ASCII to binary.  If its a protocol
  202    family that we specially handle, do that, otherwise defer to the
  203    generic parse type ng_ksocket_generic_sockaddr_type. */
  204 static int
  205 ng_ksocket_sockaddr_parse(const struct ng_parse_type *type,
  206         const char *s, int *off, const u_char *const start,
  207         u_char *const buf, int *buflen)
  208 {
  209         struct sockaddr *const sa = (struct sockaddr *)buf;
  210         enum ng_parse_token tok;
  211         char fambuf[32];
  212         int family, len;
  213         char *t;
  214 
  215         /* If next token is a left curly brace, use generic parse type */
  216         if ((tok = ng_parse_get_token(s, off, &len)) == T_LBRACE) {
  217                 return (*ng_ksocket_generic_sockaddr_type.supertype->parse)
  218                     (&ng_ksocket_generic_sockaddr_type,
  219                     s, off, start, buf, buflen);
  220         }
  221 
  222         /* Get socket address family followed by a slash */
  223         while (isspace(s[*off]))
  224                 (*off)++;
  225         if ((t = index(s + *off, '/')) == NULL)
  226                 return (EINVAL);
  227         if ((len = t - (s + *off)) > sizeof(fambuf) - 1)
  228                 return (EINVAL);
  229         strncpy(fambuf, s + *off, len);
  230         fambuf[len] = '\0';
  231         *off += len + 1;
  232         if ((family = ng_ksocket_parse(ng_ksocket_families, fambuf, 0)) == -1)
  233                 return (EINVAL);
  234 
  235         /* Set family */
  236         if (*buflen < SADATA_OFFSET)
  237                 return (ERANGE);
  238         sa->sa_family = family;
  239 
  240         /* Set family-specific data and length */
  241         switch (sa->sa_family) {
  242         case PF_LOCAL:          /* Get pathname */
  243             {
  244                 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
  245                 struct sockaddr_un *const sun = (struct sockaddr_un *)sa;
  246                 int toklen, pathlen;
  247                 char *path;
  248 
  249                 if ((path = ng_get_string_token(s, off, &toklen, NULL)) == NULL)
  250                         return (EINVAL);
  251                 pathlen = strlen(path);
  252                 if (pathlen > SOCK_MAXADDRLEN) {
  253                         free(path, M_NETGRAPH_KSOCKET);
  254                         return (E2BIG);
  255                 }
  256                 if (*buflen < pathoff + pathlen) {
  257                         free(path, M_NETGRAPH_KSOCKET);
  258                         return (ERANGE);
  259                 }
  260                 *off += toklen;
  261                 bcopy(path, sun->sun_path, pathlen);
  262                 sun->sun_len = pathoff + pathlen;
  263                 free(path, M_NETGRAPH_KSOCKET);
  264                 break;
  265             }
  266 
  267         case PF_INET:           /* Get an IP address with optional port */
  268             {
  269                 struct sockaddr_in *const sin = (struct sockaddr_in *)sa;
  270                 int i;
  271 
  272                 /* Parse this: <ipaddress>[:port] */
  273                 for (i = 0; i < 4; i++) {
  274                         u_long val;
  275                         char *eptr;
  276 
  277                         val = strtoul(s + *off, &eptr, 10);
  278                         if (val > 0xff || eptr == s + *off)
  279                                 return (EINVAL);
  280                         *off += (eptr - (s + *off));
  281                         ((u_char *)&sin->sin_addr)[i] = (u_char)val;
  282                         if (i < 3) {
  283                                 if (s[*off] != '.')
  284                                         return (EINVAL);
  285                                 (*off)++;
  286                         } else if (s[*off] == ':') {
  287                                 (*off)++;
  288                                 val = strtoul(s + *off, &eptr, 10);
  289                                 if (val > 0xffff || eptr == s + *off)
  290                                         return (EINVAL);
  291                                 *off += (eptr - (s + *off));
  292                                 sin->sin_port = htons(val);
  293                         } else
  294                                 sin->sin_port = 0;
  295                 }
  296                 bzero(&sin->sin_zero, sizeof(sin->sin_zero));
  297                 sin->sin_len = sizeof(*sin);
  298                 break;
  299             }
  300 
  301 #if 0
  302         case PF_APPLETALK:      /* XXX implement these someday */
  303         case PF_INET6:
  304         case PF_IPX:
  305 #endif
  306 
  307         default:
  308                 return (EINVAL);
  309         }
  310 
  311         /* Done */
  312         *buflen = sa->sa_len;
  313         return (0);
  314 }
  315 
  316 /* Convert a struct sockaddr from binary to ASCII */
  317 static int
  318 ng_ksocket_sockaddr_unparse(const struct ng_parse_type *type,
  319         const u_char *data, int *off, char *cbuf, int cbuflen)
  320 {
  321         const struct sockaddr *sa = (const struct sockaddr *)(data + *off);
  322         int slen = 0;
  323 
  324         /* Output socket address, either in special or generic format */
  325         switch (sa->sa_family) {
  326         case PF_LOCAL:
  327             {
  328                 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
  329                 const struct sockaddr_un *sun = (const struct sockaddr_un *)sa;
  330                 const int pathlen = sun->sun_len - pathoff;
  331                 char pathbuf[SOCK_MAXADDRLEN + 1];
  332                 char *pathtoken;
  333 
  334                 bcopy(sun->sun_path, pathbuf, pathlen);
  335                 if ((pathtoken = ng_encode_string(pathbuf, pathlen)) == NULL)
  336                         return (ENOMEM);
  337                 slen += snprintf(cbuf, cbuflen, "local/%s", pathtoken);
  338                 free(pathtoken, M_NETGRAPH_KSOCKET);
  339                 if (slen >= cbuflen)
  340                         return (ERANGE);
  341                 *off += sun->sun_len;
  342                 return (0);
  343             }
  344 
  345         case PF_INET:
  346             {
  347                 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
  348 
  349                 slen += snprintf(cbuf, cbuflen, "inet/%d.%d.%d.%d",
  350                   ((const u_char *)&sin->sin_addr)[0],
  351                   ((const u_char *)&sin->sin_addr)[1],
  352                   ((const u_char *)&sin->sin_addr)[2],
  353                   ((const u_char *)&sin->sin_addr)[3]);
  354                 if (sin->sin_port != 0) {
  355                         slen += snprintf(cbuf + strlen(cbuf),
  356                             cbuflen - strlen(cbuf), ":%d",
  357                             (u_int)ntohs(sin->sin_port));
  358                 }
  359                 if (slen >= cbuflen)
  360                         return (ERANGE);
  361                 *off += sizeof(*sin);
  362                 return(0);
  363             }
  364 
  365 #if 0
  366         case PF_APPLETALK:      /* XXX implement these someday */
  367         case PF_INET6:
  368         case PF_IPX:
  369 #endif
  370 
  371         default:
  372                 return (*ng_ksocket_generic_sockaddr_type.supertype->unparse)
  373                     (&ng_ksocket_generic_sockaddr_type,
  374                     data, off, cbuf, cbuflen);
  375         }
  376 }
  377 
  378 /* Parse type for struct sockaddr */
  379 static const struct ng_parse_type ng_ksocket_sockaddr_type = {
  380         NULL,
  381         NULL,
  382         NULL,
  383         &ng_ksocket_sockaddr_parse,
  384         &ng_ksocket_sockaddr_unparse,
  385         NULL            /* no such thing as a default struct sockaddr */
  386 };
  387 
  388 /************************************************************************
  389                 STRUCT NG_KSOCKET_SOCKOPT PARSE TYPE
  390  ************************************************************************/
  391 
  392 /* Get length of the struct ng_ksocket_sockopt value field, which is the
  393    just the excess of the message argument portion over the length of
  394    the struct ng_ksocket_sockopt. */
  395 static int
  396 ng_parse_sockoptval_getLength(const struct ng_parse_type *type,
  397         const u_char *start, const u_char *buf)
  398 {
  399         static const int offset = OFFSETOF(struct ng_ksocket_sockopt, value);
  400         const struct ng_ksocket_sockopt *sopt;
  401         const struct ng_mesg *msg;
  402 
  403         sopt = (const struct ng_ksocket_sockopt *)(buf - offset);
  404         msg = (const struct ng_mesg *)((const u_char *)sopt - sizeof(*msg));
  405         return msg->header.arglen - sizeof(*sopt);
  406 }
  407 
  408 /* Parse type for the option value part of a struct ng_ksocket_sockopt
  409    XXX Eventually, we should handle the different socket options specially.
  410    XXX This would avoid byte order problems, eg an integer value of 1 is
  411    XXX going to be "[1]" for little endian or "[3=1]" for big endian. */
  412 static const struct ng_parse_type ng_ksocket_sockoptval_type = {
  413         &ng_parse_bytearray_type,
  414         &ng_parse_sockoptval_getLength
  415 };
  416 
  417 /* Parse type for struct ng_ksocket_sockopt */
  418 static const struct ng_parse_struct_field ng_ksocket_sockopt_type_fields[]
  419         = NG_KSOCKET_SOCKOPT_INFO(&ng_ksocket_sockoptval_type);
  420 static const struct ng_parse_type ng_ksocket_sockopt_type = {
  421         &ng_parse_struct_type,
  422         &ng_ksocket_sockopt_type_fields
  423 };
  424 
  425 /* Parse type for struct ng_ksocket_accept */
  426 static const struct ng_parse_struct_field ng_ksocket_accept_type_fields[]
  427         = NGM_KSOCKET_ACCEPT_INFO;
  428 static const struct ng_parse_type ng_ksocket_accept_type = {
  429         &ng_parse_struct_type,
  430         &ng_ksocket_accept_type_fields
  431 };
  432 
  433 /* List of commands and how to convert arguments to/from ASCII */
  434 static const struct ng_cmdlist ng_ksocket_cmds[] = {
  435         {
  436           NGM_KSOCKET_COOKIE,
  437           NGM_KSOCKET_BIND,
  438           "bind",
  439           &ng_ksocket_sockaddr_type,
  440           NULL
  441         },
  442         {
  443           NGM_KSOCKET_COOKIE,
  444           NGM_KSOCKET_LISTEN,
  445           "listen",
  446           &ng_parse_int32_type,
  447           NULL
  448         },
  449         {
  450           NGM_KSOCKET_COOKIE,
  451           NGM_KSOCKET_ACCEPT,
  452           "accept",
  453           NULL,
  454           &ng_ksocket_accept_type
  455         },
  456         {
  457           NGM_KSOCKET_COOKIE,
  458           NGM_KSOCKET_CONNECT,
  459           "connect",
  460           &ng_ksocket_sockaddr_type,
  461           &ng_parse_int32_type
  462         },
  463         {
  464           NGM_KSOCKET_COOKIE,
  465           NGM_KSOCKET_GETNAME,
  466           "getname",
  467           NULL,
  468           &ng_ksocket_sockaddr_type
  469         },
  470         {
  471           NGM_KSOCKET_COOKIE,
  472           NGM_KSOCKET_GETPEERNAME,
  473           "getpeername",
  474           NULL,
  475           &ng_ksocket_sockaddr_type
  476         },
  477         {
  478           NGM_KSOCKET_COOKIE,
  479           NGM_KSOCKET_SETOPT,
  480           "setopt",
  481           &ng_ksocket_sockopt_type,
  482           NULL
  483         },
  484         {
  485           NGM_KSOCKET_COOKIE,
  486           NGM_KSOCKET_GETOPT,
  487           "getopt",
  488           &ng_ksocket_sockopt_type,
  489           &ng_ksocket_sockopt_type
  490         },
  491         { 0 }
  492 };
  493 
  494 /* Node type descriptor */
  495 static struct ng_type ng_ksocket_typestruct = {
  496         .version =      NG_ABI_VERSION,
  497         .name =         NG_KSOCKET_NODE_TYPE,
  498         .constructor =  ng_ksocket_constructor,
  499         .rcvmsg =       ng_ksocket_rcvmsg,
  500         .shutdown =     ng_ksocket_shutdown,
  501         .newhook =      ng_ksocket_newhook,
  502         .connect =      ng_ksocket_connect,
  503         .rcvdata =      ng_ksocket_rcvdata,
  504         .disconnect =   ng_ksocket_disconnect,
  505         .cmdlist =      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         priv = malloc(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;  /* XXX broken */
  552         const priv_p priv = NG_NODE_PRIVATE(node);
  553         char *s1, *s2, name[NG_HOOKSIZ];
  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 
  601         /*
  602          * In case of misconfigured routing a packet may reenter
  603          * ksocket node recursively. Decouple stack to avoid possible
  604          * panics about sleeping with locks held.
  605          */
  606         NG_HOOK_FORCE_QUEUE(hook);
  607 
  608         return(0);
  609 }
  610 
  611 static int
  612 ng_ksocket_connect(hook_p hook)
  613 {
  614         node_p node = NG_HOOK_NODE(hook);
  615         const priv_p priv = NG_NODE_PRIVATE(node);
  616         struct socket *const so = priv->so;
  617 
  618         /* Add our hook for incoming data and other events */
  619         SOCKBUF_LOCK(&priv->so->so_rcv);
  620         soupcall_set(priv->so, SO_RCV, ng_ksocket_incoming, node);
  621         SOCKBUF_UNLOCK(&priv->so->so_rcv);
  622         SOCKBUF_LOCK(&priv->so->so_snd);
  623         soupcall_set(priv->so, SO_SND, ng_ksocket_incoming, node);
  624         SOCKBUF_UNLOCK(&priv->so->so_snd);
  625         SOCK_LOCK(priv->so);
  626         priv->so->so_state |= SS_NBIO;
  627         SOCK_UNLOCK(priv->so);
  628         /*
  629          * --Original comment--
  630          * On a cloned socket we may have already received one or more
  631          * upcalls which we couldn't handle without a hook.  Handle
  632          * those now.
  633          * We cannot call the upcall function directly
  634          * from here, because until this function has returned our
  635          * hook isn't connected.
  636          *
  637          * ---meta comment for -current ---
  638          * XXX This is dubius.
  639          * Upcalls between the time that the hook was
  640          * first created and now (on another processesor) will
  641          * be earlier on the queue than the request to finalise the hook.
  642          * By the time the hook is finalised,
  643          * The queued upcalls will have happenned and the code
  644          * will have discarded them because of a lack of a hook.
  645          * (socket not open).
  646          *
  647          * This is a bad byproduct of the complicated way in which hooks
  648          * are now created (3 daisy chained async events).
  649          *
  650          * Since we are a netgraph operation 
  651          * We know that we hold a lock on this node. This forces the
  652          * request we make below to be queued rather than implemented
  653          * immediatly which will cause the upcall function to be called a bit
  654          * later.
  655          * However, as we will run any waiting queued operations immediatly
  656          * after doing this one, if we have not finalised the other end
  657          * of the hook, those queued operations will fail.
  658          */
  659         if (priv->flags & KSF_CLONED) {
  660                 ng_send_fn(node, NULL, &ng_ksocket_incoming2, so, M_NOWAIT);
  661         }
  662 
  663         return (0);
  664 }
  665 
  666 /*
  667  * Receive a control message
  668  */
  669 static int
  670 ng_ksocket_rcvmsg(node_p node, item_p item, hook_p lasthook)
  671 {
  672         struct thread *td = curthread;  /* XXX broken */
  673         const priv_p priv = NG_NODE_PRIVATE(node);
  674         struct socket *const so = priv->so;
  675         struct ng_mesg *resp = NULL;
  676         int error = 0;
  677         struct ng_mesg *msg;
  678         ng_ID_t raddr;
  679 
  680         NGI_GET_MSG(item, msg);
  681         switch (msg->header.typecookie) {
  682         case NGM_KSOCKET_COOKIE:
  683                 switch (msg->header.cmd) {
  684                 case NGM_KSOCKET_BIND:
  685                     {
  686                         struct sockaddr *const sa
  687                             = (struct sockaddr *)msg->data;
  688 
  689                         /* Sanity check */
  690                         if (msg->header.arglen < SADATA_OFFSET
  691                             || msg->header.arglen < sa->sa_len)
  692                                 ERROUT(EINVAL);
  693                         if (so == NULL)
  694                                 ERROUT(ENXIO);
  695 
  696                         /* Bind */
  697                         error = sobind(so, sa, td);
  698                         break;
  699                     }
  700                 case NGM_KSOCKET_LISTEN:
  701                     {
  702                         /* Sanity check */
  703                         if (msg->header.arglen != sizeof(int32_t))
  704                                 ERROUT(EINVAL);
  705                         if (so == NULL)
  706                                 ERROUT(ENXIO);
  707 
  708                         /* Listen */
  709                         error = solisten(so, *((int32_t *)msg->data), td);
  710                         break;
  711                     }
  712 
  713                 case NGM_KSOCKET_ACCEPT:
  714                     {
  715                         /* Sanity check */
  716                         if (msg->header.arglen != 0)
  717                                 ERROUT(EINVAL);
  718                         if (so == NULL)
  719                                 ERROUT(ENXIO);
  720 
  721                         /* Make sure the socket is capable of accepting */
  722                         if (!(so->so_options & SO_ACCEPTCONN))
  723                                 ERROUT(EINVAL);
  724                         if (priv->flags & KSF_ACCEPTING)
  725                                 ERROUT(EALREADY);
  726 
  727                         error = ng_ksocket_check_accept(priv);
  728                         if (error != 0 && error != EWOULDBLOCK)
  729                                 ERROUT(error);
  730 
  731                         /*
  732                          * If a connection is already complete, take it.
  733                          * Otherwise let the upcall function deal with
  734                          * the connection when it comes in.
  735                          */
  736                         priv->response_token = msg->header.token;
  737                         raddr = priv->response_addr = NGI_RETADDR(item);
  738                         if (error == 0) {
  739                                 ng_ksocket_finish_accept(priv);
  740                         } else
  741                                 priv->flags |= KSF_ACCEPTING;
  742                         break;
  743                     }
  744 
  745                 case NGM_KSOCKET_CONNECT:
  746                     {
  747                         struct sockaddr *const sa
  748                             = (struct sockaddr *)msg->data;
  749 
  750                         /* Sanity check */
  751                         if (msg->header.arglen < SADATA_OFFSET
  752                             || msg->header.arglen < sa->sa_len)
  753                                 ERROUT(EINVAL);
  754                         if (so == NULL)
  755                                 ERROUT(ENXIO);
  756 
  757                         /* Do connect */
  758                         if ((so->so_state & SS_ISCONNECTING) != 0)
  759                                 ERROUT(EALREADY);
  760                         if ((error = soconnect(so, sa, td)) != 0) {
  761                                 so->so_state &= ~SS_ISCONNECTING;
  762                                 ERROUT(error);
  763                         }
  764                         if ((so->so_state & SS_ISCONNECTING) != 0) {
  765                                 /* We will notify the sender when we connect */
  766                                 priv->response_token = msg->header.token;
  767                                 raddr = priv->response_addr = NGI_RETADDR(item);
  768                                 priv->flags |= KSF_CONNECTING;
  769                                 ERROUT(EINPROGRESS);
  770                         }
  771                         break;
  772                     }
  773 
  774                 case NGM_KSOCKET_GETNAME:
  775                 case NGM_KSOCKET_GETPEERNAME:
  776                     {
  777                         int (*func)(struct socket *so, struct sockaddr **nam);
  778                         struct sockaddr *sa = NULL;
  779                         int len;
  780 
  781                         /* Sanity check */
  782                         if (msg->header.arglen != 0)
  783                                 ERROUT(EINVAL);
  784                         if (so == NULL)
  785                                 ERROUT(ENXIO);
  786 
  787                         /* Get function */
  788                         if (msg->header.cmd == NGM_KSOCKET_GETPEERNAME) {
  789                                 if ((so->so_state
  790                                     & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) 
  791                                         ERROUT(ENOTCONN);
  792                                 func = so->so_proto->pr_usrreqs->pru_peeraddr;
  793                         } else
  794                                 func = so->so_proto->pr_usrreqs->pru_sockaddr;
  795 
  796                         /* Get local or peer address */
  797                         if ((error = (*func)(so, &sa)) != 0)
  798                                 goto bail;
  799                         len = (sa == NULL) ? 0 : sa->sa_len;
  800 
  801                         /* Send it back in a response */
  802                         NG_MKRESPONSE(resp, msg, len, M_NOWAIT);
  803                         if (resp == NULL) {
  804                                 error = ENOMEM;
  805                                 goto bail;
  806                         }
  807                         bcopy(sa, resp->data, len);
  808 
  809                 bail:
  810                         /* Cleanup */
  811                         if (sa != NULL)
  812                                 free(sa, M_SONAME);
  813                         break;
  814                     }
  815 
  816                 case NGM_KSOCKET_GETOPT:
  817                     {
  818                         struct ng_ksocket_sockopt *ksopt = 
  819                             (struct ng_ksocket_sockopt *)msg->data;
  820                         struct sockopt sopt;
  821 
  822                         /* Sanity check */
  823                         if (msg->header.arglen != sizeof(*ksopt))
  824                                 ERROUT(EINVAL);
  825                         if (so == NULL)
  826                                 ERROUT(ENXIO);
  827 
  828                         /* Get response with room for option value */
  829                         NG_MKRESPONSE(resp, msg, sizeof(*ksopt)
  830                             + NG_KSOCKET_MAX_OPTLEN, M_NOWAIT);
  831                         if (resp == NULL)
  832                                 ERROUT(ENOMEM);
  833 
  834                         /* Get socket option, and put value in the response */
  835                         sopt.sopt_dir = SOPT_GET;
  836                         sopt.sopt_level = ksopt->level;
  837                         sopt.sopt_name = ksopt->name;
  838                         sopt.sopt_td = NULL;
  839                         sopt.sopt_valsize = NG_KSOCKET_MAX_OPTLEN;
  840                         ksopt = (struct ng_ksocket_sockopt *)resp->data;
  841                         sopt.sopt_val = ksopt->value;
  842                         if ((error = sogetopt(so, &sopt)) != 0) {
  843                                 NG_FREE_MSG(resp);
  844                                 break;
  845                         }
  846 
  847                         /* Set actual value length */
  848                         resp->header.arglen = sizeof(*ksopt)
  849                             + sopt.sopt_valsize;
  850                         break;
  851                     }
  852 
  853                 case NGM_KSOCKET_SETOPT:
  854                     {
  855                         struct ng_ksocket_sockopt *const ksopt = 
  856                             (struct ng_ksocket_sockopt *)msg->data;
  857                         const int valsize = msg->header.arglen - sizeof(*ksopt);
  858                         struct sockopt sopt;
  859 
  860                         /* Sanity check */
  861                         if (valsize < 0)
  862                                 ERROUT(EINVAL);
  863                         if (so == NULL)
  864                                 ERROUT(ENXIO);
  865 
  866                         /* Set socket option */
  867                         sopt.sopt_dir = SOPT_SET;
  868                         sopt.sopt_level = ksopt->level;
  869                         sopt.sopt_name = ksopt->name;
  870                         sopt.sopt_val = ksopt->value;
  871                         sopt.sopt_valsize = valsize;
  872                         sopt.sopt_td = NULL;
  873                         error = sosetopt(so, &sopt);
  874                         break;
  875                     }
  876 
  877                 default:
  878                         error = EINVAL;
  879                         break;
  880                 }
  881                 break;
  882         default:
  883                 error = EINVAL;
  884                 break;
  885         }
  886 done:
  887         NG_RESPOND_MSG(error, node, item, resp);
  888         NG_FREE_MSG(msg);
  889         return (error);
  890 }
  891 
  892 /*
  893  * Receive incoming data on our hook.  Send it out the socket.
  894  */
  895 static int
  896 ng_ksocket_rcvdata(hook_p hook, item_p item)
  897 {
  898         struct thread *td = curthread;  /* XXX broken */
  899         const node_p node = NG_HOOK_NODE(hook);
  900         const priv_p priv = NG_NODE_PRIVATE(node);
  901         struct socket *const so = priv->so;
  902         struct sockaddr *sa = NULL;
  903         int error;
  904         struct mbuf *m;
  905 #ifdef ALIGNED_POINTER
  906         struct mbuf *n;
  907 #endif /* ALIGNED_POINTER */
  908         struct sa_tag *stag;
  909 
  910         /* Extract data */
  911         NGI_GET_M(item, m);
  912         NG_FREE_ITEM(item);
  913 #ifdef ALIGNED_POINTER
  914         if (!ALIGNED_POINTER(mtod(m, caddr_t), uint32_t)) {
  915                 n = m_defrag(m, M_NOWAIT);
  916                 if (n == NULL) {
  917                         m_freem(m);
  918                         return (ENOBUFS);
  919                 }
  920                 m = n;
  921         }
  922 #endif /* ALIGNED_POINTER */
  923         /*
  924          * Look if socket address is stored in packet tags.
  925          * If sockaddr is ours, or provided by a third party (zero id),
  926          * then we accept it.
  927          */
  928         if (((stag = (struct sa_tag *)m_tag_locate(m, NGM_KSOCKET_COOKIE,
  929             NG_KSOCKET_TAG_SOCKADDR, NULL)) != NULL) &&
  930             (stag->id == NG_NODE_ID(node) || stag->id == 0))
  931                 sa = &stag->sa;
  932 
  933         /* Reset specific mbuf flags to prevent addressing problems. */
  934         m->m_flags &= ~(M_BCAST|M_MCAST);
  935 
  936         /* Send packet */
  937         error = sosend(so, sa, 0, m, 0, 0, td);
  938 
  939         return (error);
  940 }
  941 
  942 /*
  943  * Destroy node
  944  */
  945 static int
  946 ng_ksocket_shutdown(node_p node)
  947 {
  948         const priv_p priv = NG_NODE_PRIVATE(node);
  949         priv_p embryo;
  950 
  951         /* Close our socket (if any) */
  952         if (priv->so != NULL) {
  953                 SOCKBUF_LOCK(&priv->so->so_rcv);
  954                 soupcall_clear(priv->so, SO_RCV);
  955                 SOCKBUF_UNLOCK(&priv->so->so_rcv);
  956                 SOCKBUF_LOCK(&priv->so->so_snd);
  957                 soupcall_clear(priv->so, SO_SND);
  958                 SOCKBUF_UNLOCK(&priv->so->so_snd);
  959                 soclose(priv->so);
  960                 priv->so = NULL;
  961         }
  962 
  963         /* If we are an embryo, take ourselves out of the parent's list */
  964         if (priv->flags & KSF_EMBRYONIC) {
  965                 LIST_REMOVE(priv, siblings);
  966                 priv->flags &= ~KSF_EMBRYONIC;
  967         }
  968 
  969         /* Remove any embryonic children we have */
  970         while (!LIST_EMPTY(&priv->embryos)) {
  971                 embryo = LIST_FIRST(&priv->embryos);
  972                 ng_rmnode_self(embryo->node);
  973         }
  974 
  975         /* Take down netgraph node */
  976         bzero(priv, sizeof(*priv));
  977         free(priv, M_NETGRAPH_KSOCKET);
  978         NG_NODE_SET_PRIVATE(node, NULL);
  979         NG_NODE_UNREF(node);            /* let the node escape */
  980         return (0);
  981 }
  982 
  983 /*
  984  * Hook disconnection
  985  */
  986 static int
  987 ng_ksocket_disconnect(hook_p hook)
  988 {
  989         KASSERT(NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0,
  990             ("%s: numhooks=%d?", __func__,
  991             NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook))));
  992         if (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))
  993                 ng_rmnode_self(NG_HOOK_NODE(hook));
  994         return (0);
  995 }
  996 
  997 /************************************************************************
  998                         HELPER STUFF
  999  ************************************************************************/
 1000 /* 
 1001  * You should not "just call" a netgraph node function from an external
 1002  * asynchronous event. This is because in doing so you are ignoring the
 1003  * locking on the netgraph nodes. Instead call your function via ng_send_fn().
 1004  * This will call the function you chose, but will first do all the 
 1005  * locking rigmarole. Your function MAY only be called at some distant future
 1006  * time (several millisecs away) so don't give it any arguments
 1007  * that may be revoked soon (e.g. on your stack).
 1008  *
 1009  * To decouple stack, we use queue version of ng_send_fn().
 1010  */
 1011 
 1012 static int
 1013 ng_ksocket_incoming(struct socket *so, void *arg, int waitflag)
 1014 {
 1015         const node_p node = arg;
 1016         const priv_p priv = NG_NODE_PRIVATE(node);
 1017         int wait = ((waitflag & M_WAITOK) ? NG_WAITOK : 0) | NG_QUEUE;
 1018 
 1019         /*
 1020          * Even if node is not locked, as soon as we are called, we assume
 1021          * it exist and it's private area is valid. With some care we can
 1022          * access it. Mark node that incoming event for it was sent to
 1023          * avoid unneded queue trashing.
 1024          */
 1025         if (atomic_cmpset_int(&priv->fn_sent, 0, 1) &&
 1026             ng_send_fn1(node, NULL, &ng_ksocket_incoming2, so, 0, wait)) {
 1027                 atomic_store_rel_int(&priv->fn_sent, 0);
 1028         }
 1029         return (SU_OK);
 1030 }
 1031 
 1032 
 1033 /*
 1034  * When incoming data is appended to the socket, we get notified here.
 1035  * This is also called whenever a significant event occurs for the socket.
 1036  * Our original caller may have queued this even some time ago and 
 1037  * we cannot trust that he even still exists. The node however is being
 1038  * held with a reference by the queueing code and guarantied to be valid.
 1039  */
 1040 static void
 1041 ng_ksocket_incoming2(node_p node, hook_p hook, void *arg1, int arg2)
 1042 {
 1043         struct socket *so = arg1;
 1044         const priv_p priv = NG_NODE_PRIVATE(node);
 1045         struct mbuf *m;
 1046         struct ng_mesg *response;
 1047         struct uio auio;
 1048         int s, flags, error;
 1049 
 1050         s = splnet();
 1051 
 1052         /* so = priv->so; *//* XXX could have derived this like so */
 1053         KASSERT(so == priv->so, ("%s: wrong socket", __func__));
 1054         
 1055         /* Allow next incoming event to be queued. */
 1056         atomic_store_rel_int(&priv->fn_sent, 0);
 1057 
 1058         /* Check whether a pending connect operation has completed */
 1059         if (priv->flags & KSF_CONNECTING) {
 1060                 if ((error = so->so_error) != 0) {
 1061                         so->so_error = 0;
 1062                         so->so_state &= ~SS_ISCONNECTING;
 1063                 }
 1064                 if (!(so->so_state & SS_ISCONNECTING)) {
 1065                         NG_MKMESSAGE(response, NGM_KSOCKET_COOKIE,
 1066                             NGM_KSOCKET_CONNECT, sizeof(int32_t), M_NOWAIT);
 1067                         if (response != NULL) {
 1068                                 response->header.flags |= NGF_RESP;
 1069                                 response->header.token = priv->response_token;
 1070                                 *(int32_t *)response->data = error;
 1071                                 /* 
 1072                                  * send an async "response" message
 1073                                  * to the node that set us up
 1074                                  * (if it still exists)
 1075                                  */
 1076                                 NG_SEND_MSG_ID(error, node,
 1077                                     response, priv->response_addr, 0);
 1078                         }
 1079                         priv->flags &= ~KSF_CONNECTING;
 1080                 }
 1081         }
 1082 
 1083         /* Check whether a pending accept operation has completed */
 1084         if (priv->flags & KSF_ACCEPTING) {
 1085                 error = ng_ksocket_check_accept(priv);
 1086                 if (error != EWOULDBLOCK)
 1087                         priv->flags &= ~KSF_ACCEPTING;
 1088                 if (error == 0)
 1089                         ng_ksocket_finish_accept(priv);
 1090         }
 1091 
 1092         /*
 1093          * If we don't have a hook, we must handle data events later.  When
 1094          * the hook gets created and is connected, this upcall function
 1095          * will be called again.
 1096          */
 1097         if (priv->hook == NULL) {
 1098                 splx(s);
 1099                 return;
 1100         }
 1101 
 1102         /* Read and forward available mbuf's */
 1103         auio.uio_td = NULL;
 1104         auio.uio_resid = 1000000000;
 1105         flags = MSG_DONTWAIT;
 1106         while (1) {
 1107                 struct sockaddr *sa = NULL;
 1108                 struct mbuf *n;
 1109 
 1110                 /* Try to get next packet from socket */
 1111                 if ((error = soreceive(so, (so->so_state & SS_ISCONNECTED) ?
 1112                     NULL : &sa, &auio, &m, (struct mbuf **)0, &flags)) != 0)
 1113                         break;
 1114 
 1115                 /* See if we got anything */
 1116                 if (m == NULL) {
 1117                         if (sa != NULL)
 1118                                 free(sa, M_SONAME);
 1119                         break;
 1120                 }
 1121 
 1122                 /*
 1123                  * Don't trust the various socket layers to get the
 1124                  * packet header and length correct (e.g. kern/15175).
 1125                  *
 1126                  * Also, do not trust that soreceive() will clear m_nextpkt
 1127                  * for us (e.g. kern/84952, kern/82413).
 1128                  */
 1129                 m->m_pkthdr.csum_flags = 0;
 1130                 for (n = m, m->m_pkthdr.len = 0; n != NULL; n = n->m_next) {
 1131                         m->m_pkthdr.len += n->m_len;
 1132                         n->m_nextpkt = NULL;
 1133                 }
 1134 
 1135                 /* Put peer's socket address (if any) into a tag */
 1136                 if (sa != NULL) {
 1137                         struct sa_tag   *stag;
 1138 
 1139                         stag = (struct sa_tag *)m_tag_alloc(NGM_KSOCKET_COOKIE,
 1140                             NG_KSOCKET_TAG_SOCKADDR, sizeof(ng_ID_t) +
 1141                             sa->sa_len, M_NOWAIT);
 1142                         if (stag == NULL) {
 1143                                 free(sa, M_SONAME);
 1144                                 goto sendit;
 1145                         }
 1146                         bcopy(sa, &stag->sa, sa->sa_len);
 1147                         free(sa, M_SONAME);
 1148                         stag->id = NG_NODE_ID(node);
 1149                         m_tag_prepend(m, &stag->tag);
 1150                 }
 1151 
 1152 sendit:         /* Forward data with optional peer sockaddr as packet tag */
 1153                 NG_SEND_DATA_ONLY(error, priv->hook, m);
 1154         }
 1155 
 1156         /*
 1157          * If the peer has closed the connection, forward a 0-length mbuf
 1158          * to indicate end-of-file.
 1159          */
 1160         if (so->so_rcv.sb_state & SBS_CANTRCVMORE && !(priv->flags & KSF_EOFSEEN)) {
 1161                 MGETHDR(m, M_NOWAIT, MT_DATA);
 1162                 if (m != NULL) {
 1163                         m->m_len = m->m_pkthdr.len = 0;
 1164                         NG_SEND_DATA_ONLY(error, priv->hook, m);
 1165                 }
 1166                 priv->flags |= KSF_EOFSEEN;
 1167         }
 1168         splx(s);
 1169 }
 1170 
 1171 /*
 1172  * Check for a completed incoming connection and return 0 if one is found.
 1173  * Otherwise return the appropriate error code.
 1174  */
 1175 static int
 1176 ng_ksocket_check_accept(priv_p priv)
 1177 {
 1178         struct socket *const head = priv->so;
 1179         int error;
 1180 
 1181         if ((error = head->so_error) != 0) {
 1182                 head->so_error = 0;
 1183                 return error;
 1184         }
 1185         /* Unlocked read. */
 1186         if (TAILQ_EMPTY(&head->so_comp)) {
 1187                 if (head->so_rcv.sb_state & SBS_CANTRCVMORE)
 1188                         return ECONNABORTED;
 1189                 return EWOULDBLOCK;
 1190         }
 1191         return 0;
 1192 }
 1193 
 1194 /*
 1195  * Handle the first completed incoming connection, assumed to be already
 1196  * on the socket's so_comp queue.
 1197  */
 1198 static void
 1199 ng_ksocket_finish_accept(priv_p priv)
 1200 {
 1201         struct socket *const head = priv->so;
 1202         struct socket *so;
 1203         struct sockaddr *sa = NULL;
 1204         struct ng_mesg *resp;
 1205         struct ng_ksocket_accept *resp_data;
 1206         node_p node;
 1207         priv_p priv2;
 1208         int len;
 1209         int error;
 1210 
 1211         ACCEPT_LOCK();
 1212         so = TAILQ_FIRST(&head->so_comp);
 1213         if (so == NULL) {       /* Should never happen */
 1214                 ACCEPT_UNLOCK();
 1215                 return;
 1216         }
 1217         TAILQ_REMOVE(&head->so_comp, so, so_list);
 1218         head->so_qlen--;
 1219         so->so_qstate &= ~SQ_COMP;
 1220         so->so_head = NULL;
 1221         SOCK_LOCK(so);
 1222         soref(so);
 1223         so->so_state |= SS_NBIO;
 1224         SOCK_UNLOCK(so);
 1225         ACCEPT_UNLOCK();
 1226 
 1227         /* XXX KNOTE_UNLOCKED(&head->so_rcv.sb_sel.si_note, 0); */
 1228 
 1229         soaccept(so, &sa);
 1230 
 1231         len = OFFSETOF(struct ng_ksocket_accept, addr);
 1232         if (sa != NULL)
 1233                 len += sa->sa_len;
 1234 
 1235         NG_MKMESSAGE(resp, NGM_KSOCKET_COOKIE, NGM_KSOCKET_ACCEPT, len,
 1236             M_NOWAIT);
 1237         if (resp == NULL) {
 1238                 soclose(so);
 1239                 goto out;
 1240         }
 1241         resp->header.flags |= NGF_RESP;
 1242         resp->header.token = priv->response_token;
 1243 
 1244         /* Clone a ksocket node to wrap the new socket */
 1245         error = ng_make_node_common(&ng_ksocket_typestruct, &node);
 1246         if (error) {
 1247                 free(resp, M_NETGRAPH);
 1248                 soclose(so);
 1249                 goto out;
 1250         }
 1251 
 1252         if (ng_ksocket_constructor(node) != 0) {
 1253                 NG_NODE_UNREF(node);
 1254                 free(resp, M_NETGRAPH);
 1255                 soclose(so);
 1256                 goto out;
 1257         }
 1258 
 1259         priv2 = NG_NODE_PRIVATE(node);
 1260         priv2->so = so;
 1261         priv2->flags |= KSF_CLONED | KSF_EMBRYONIC;
 1262 
 1263         /*
 1264          * Insert the cloned node into a list of embryonic children
 1265          * on the parent node.  When a hook is created on the cloned
 1266          * node it will be removed from this list.  When the parent
 1267          * is destroyed it will destroy any embryonic children it has.
 1268          */
 1269         LIST_INSERT_HEAD(&priv->embryos, priv2, siblings);
 1270 
 1271         SOCKBUF_LOCK(&so->so_rcv);
 1272         soupcall_set(so, SO_RCV, ng_ksocket_incoming, node);
 1273         SOCKBUF_UNLOCK(&so->so_rcv);
 1274         SOCKBUF_LOCK(&so->so_snd);
 1275         soupcall_set(so, SO_RCV, ng_ksocket_incoming, node);
 1276         SOCKBUF_UNLOCK(&so->so_snd);
 1277 
 1278         /* Fill in the response data and send it or return it to the caller */
 1279         resp_data = (struct ng_ksocket_accept *)resp->data;
 1280         resp_data->nodeid = NG_NODE_ID(node);
 1281         if (sa != NULL)
 1282                 bcopy(sa, &resp_data->addr, sa->sa_len);
 1283         NG_SEND_MSG_ID(error, node, resp, priv->response_addr, 0);
 1284 
 1285 out:
 1286         if (sa != NULL)
 1287                 free(sa, M_SONAME);
 1288 }
 1289 
 1290 /*
 1291  * Parse out either an integer value or an alias.
 1292  */
 1293 static int
 1294 ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
 1295         const char *s, int family)
 1296 {
 1297         int k, val;
 1298         char *eptr;
 1299 
 1300         /* Try aliases */
 1301         for (k = 0; aliases[k].name != NULL; k++) {
 1302                 if (strcmp(s, aliases[k].name) == 0
 1303                     && aliases[k].family == family)
 1304                         return aliases[k].value;
 1305         }
 1306 
 1307         /* Try parsing as a number */
 1308         val = (int)strtoul(s, &eptr, 10);
 1309         if (val < 0 || *eptr != '\0')
 1310                 return (-1);
 1311         return (val);
 1312 }
 1313 

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