The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_ksocket.c

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    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: stable/9/sys/netgraph/ng_ksocket.c 249132 2013-04-05 08:22:11Z 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 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         { "atalk",      PF_APPLETALK    },
  124         { "ipx",        PF_IPX          },
  125         { "atm",        PF_ATM          },
  126         { NULL,         -1              },
  127 };
  128 
  129 /* Socket type aliases */
  130 static const struct ng_ksocket_alias ng_ksocket_types[] = {
  131         { "stream",     SOCK_STREAM     },
  132         { "dgram",      SOCK_DGRAM      },
  133         { "raw",        SOCK_RAW        },
  134         { "rdm",        SOCK_RDM        },
  135         { "seqpacket",  SOCK_SEQPACKET  },
  136         { NULL,         -1              },
  137 };
  138 
  139 /* Protocol aliases */
  140 static const struct ng_ksocket_alias ng_ksocket_protos[] = {
  141         { "ip",         IPPROTO_IP,             PF_INET         },
  142         { "raw",        IPPROTO_RAW,            PF_INET         },
  143         { "icmp",       IPPROTO_ICMP,           PF_INET         },
  144         { "igmp",       IPPROTO_IGMP,           PF_INET         },
  145         { "tcp",        IPPROTO_TCP,            PF_INET         },
  146         { "udp",        IPPROTO_UDP,            PF_INET         },
  147         { "gre",        IPPROTO_GRE,            PF_INET         },
  148         { "esp",        IPPROTO_ESP,            PF_INET         },
  149         { "ah",         IPPROTO_AH,             PF_INET         },
  150         { "swipe",      IPPROTO_SWIPE,          PF_INET         },
  151         { "encap",      IPPROTO_ENCAP,          PF_INET         },
  152         { "divert",     IPPROTO_DIVERT,         PF_INET         },
  153         { "pim",        IPPROTO_PIM,            PF_INET         },
  154         { "ddp",        ATPROTO_DDP,            PF_APPLETALK    },
  155         { "aarp",       ATPROTO_AARP,           PF_APPLETALK    },
  156         { NULL,         -1                                      },
  157 };
  158 
  159 /* Helper functions */
  160 static int      ng_ksocket_check_accept(priv_p);
  161 static void     ng_ksocket_finish_accept(priv_p);
  162 static int      ng_ksocket_incoming(struct socket *so, void *arg, int waitflag);
  163 static int      ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
  164                         const char *s, int family);
  165 static void     ng_ksocket_incoming2(node_p node, hook_p hook,
  166                         void *arg1, int arg2);
  167 
  168 /************************************************************************
  169                         STRUCT SOCKADDR PARSE TYPE
  170  ************************************************************************/
  171 
  172 /* Get the length of the data portion of a generic struct sockaddr */
  173 static int
  174 ng_parse_generic_sockdata_getLength(const struct ng_parse_type *type,
  175         const u_char *start, const u_char *buf)
  176 {
  177         const struct sockaddr *sa;
  178 
  179         sa = (const struct sockaddr *)(buf - SADATA_OFFSET);
  180         return (sa->sa_len < SADATA_OFFSET) ? 0 : sa->sa_len - SADATA_OFFSET;
  181 }
  182 
  183 /* Type for the variable length data portion of a generic struct sockaddr */
  184 static const struct ng_parse_type ng_ksocket_generic_sockdata_type = {
  185         &ng_parse_bytearray_type,
  186         &ng_parse_generic_sockdata_getLength
  187 };
  188 
  189 /* Type for a generic struct sockaddr */
  190 static const struct ng_parse_struct_field
  191     ng_parse_generic_sockaddr_type_fields[] = {
  192           { "len",      &ng_parse_uint8_type                    },
  193           { "family",   &ng_parse_uint8_type                    },
  194           { "data",     &ng_ksocket_generic_sockdata_type       },
  195           { NULL }
  196 };
  197 static const struct ng_parse_type ng_ksocket_generic_sockaddr_type = {
  198         &ng_parse_struct_type,
  199         &ng_parse_generic_sockaddr_type_fields
  200 };
  201 
  202 /* Convert a struct sockaddr from ASCII to binary.  If its a protocol
  203    family that we specially handle, do that, otherwise defer to the
  204    generic parse type ng_ksocket_generic_sockaddr_type. */
  205 static int
  206 ng_ksocket_sockaddr_parse(const struct ng_parse_type *type,
  207         const char *s, int *off, const u_char *const start,
  208         u_char *const buf, int *buflen)
  209 {
  210         struct sockaddr *const sa = (struct sockaddr *)buf;
  211         enum ng_parse_token tok;
  212         char fambuf[32];
  213         int family, len;
  214         char *t;
  215 
  216         /* If next token is a left curly brace, use generic parse type */
  217         if ((tok = ng_parse_get_token(s, off, &len)) == T_LBRACE) {
  218                 return (*ng_ksocket_generic_sockaddr_type.supertype->parse)
  219                     (&ng_ksocket_generic_sockaddr_type,
  220                     s, off, start, buf, buflen);
  221         }
  222 
  223         /* Get socket address family followed by a slash */
  224         while (isspace(s[*off]))
  225                 (*off)++;
  226         if ((t = index(s + *off, '/')) == NULL)
  227                 return (EINVAL);
  228         if ((len = t - (s + *off)) > sizeof(fambuf) - 1)
  229                 return (EINVAL);
  230         strncpy(fambuf, s + *off, len);
  231         fambuf[len] = '\0';
  232         *off += len + 1;
  233         if ((family = ng_ksocket_parse(ng_ksocket_families, fambuf, 0)) == -1)
  234                 return (EINVAL);
  235 
  236         /* Set family */
  237         if (*buflen < SADATA_OFFSET)
  238                 return (ERANGE);
  239         sa->sa_family = family;
  240 
  241         /* Set family-specific data and length */
  242         switch (sa->sa_family) {
  243         case PF_LOCAL:          /* Get pathname */
  244             {
  245                 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
  246                 struct sockaddr_un *const sun = (struct sockaddr_un *)sa;
  247                 int toklen, pathlen;
  248                 char *path;
  249 
  250                 if ((path = ng_get_string_token(s, off, &toklen, NULL)) == NULL)
  251                         return (EINVAL);
  252                 pathlen = strlen(path);
  253                 if (pathlen > SOCK_MAXADDRLEN) {
  254                         free(path, M_NETGRAPH_KSOCKET);
  255                         return (E2BIG);
  256                 }
  257                 if (*buflen < pathoff + pathlen) {
  258                         free(path, M_NETGRAPH_KSOCKET);
  259                         return (ERANGE);
  260                 }
  261                 *off += toklen;
  262                 bcopy(path, sun->sun_path, pathlen);
  263                 sun->sun_len = pathoff + pathlen;
  264                 free(path, M_NETGRAPH_KSOCKET);
  265                 break;
  266             }
  267 
  268         case PF_INET:           /* Get an IP address with optional port */
  269             {
  270                 struct sockaddr_in *const sin = (struct sockaddr_in *)sa;
  271                 int i;
  272 
  273                 /* Parse this: <ipaddress>[:port] */
  274                 for (i = 0; i < 4; i++) {
  275                         u_long val;
  276                         char *eptr;
  277 
  278                         val = strtoul(s + *off, &eptr, 10);
  279                         if (val > 0xff || eptr == s + *off)
  280                                 return (EINVAL);
  281                         *off += (eptr - (s + *off));
  282                         ((u_char *)&sin->sin_addr)[i] = (u_char)val;
  283                         if (i < 3) {
  284                                 if (s[*off] != '.')
  285                                         return (EINVAL);
  286                                 (*off)++;
  287                         } else if (s[*off] == ':') {
  288                                 (*off)++;
  289                                 val = strtoul(s + *off, &eptr, 10);
  290                                 if (val > 0xffff || eptr == s + *off)
  291                                         return (EINVAL);
  292                                 *off += (eptr - (s + *off));
  293                                 sin->sin_port = htons(val);
  294                         } else
  295                                 sin->sin_port = 0;
  296                 }
  297                 bzero(&sin->sin_zero, sizeof(sin->sin_zero));
  298                 sin->sin_len = sizeof(*sin);
  299                 break;
  300             }
  301 
  302 #if 0
  303         case PF_APPLETALK:      /* XXX implement these someday */
  304         case PF_INET6:
  305         case PF_IPX:
  306 #endif
  307 
  308         default:
  309                 return (EINVAL);
  310         }
  311 
  312         /* Done */
  313         *buflen = sa->sa_len;
  314         return (0);
  315 }
  316 
  317 /* Convert a struct sockaddr from binary to ASCII */
  318 static int
  319 ng_ksocket_sockaddr_unparse(const struct ng_parse_type *type,
  320         const u_char *data, int *off, char *cbuf, int cbuflen)
  321 {
  322         const struct sockaddr *sa = (const struct sockaddr *)(data + *off);
  323         int slen = 0;
  324 
  325         /* Output socket address, either in special or generic format */
  326         switch (sa->sa_family) {
  327         case PF_LOCAL:
  328             {
  329                 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
  330                 const struct sockaddr_un *sun = (const struct sockaddr_un *)sa;
  331                 const int pathlen = sun->sun_len - pathoff;
  332                 char pathbuf[SOCK_MAXADDRLEN + 1];
  333                 char *pathtoken;
  334 
  335                 bcopy(sun->sun_path, pathbuf, pathlen);
  336                 if ((pathtoken = ng_encode_string(pathbuf, pathlen)) == NULL)
  337                         return (ENOMEM);
  338                 slen += snprintf(cbuf, cbuflen, "local/%s", pathtoken);
  339                 free(pathtoken, M_NETGRAPH_KSOCKET);
  340                 if (slen >= cbuflen)
  341                         return (ERANGE);
  342                 *off += sun->sun_len;
  343                 return (0);
  344             }
  345 
  346         case PF_INET:
  347             {
  348                 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
  349 
  350                 slen += snprintf(cbuf, cbuflen, "inet/%d.%d.%d.%d",
  351                   ((const u_char *)&sin->sin_addr)[0],
  352                   ((const u_char *)&sin->sin_addr)[1],
  353                   ((const u_char *)&sin->sin_addr)[2],
  354                   ((const u_char *)&sin->sin_addr)[3]);
  355                 if (sin->sin_port != 0) {
  356                         slen += snprintf(cbuf + strlen(cbuf),
  357                             cbuflen - strlen(cbuf), ":%d",
  358                             (u_int)ntohs(sin->sin_port));
  359                 }
  360                 if (slen >= cbuflen)
  361                         return (ERANGE);
  362                 *off += sizeof(*sin);
  363                 return(0);
  364             }
  365 
  366 #if 0
  367         case PF_APPLETALK:      /* XXX implement these someday */
  368         case PF_INET6:
  369         case PF_IPX:
  370 #endif
  371 
  372         default:
  373                 return (*ng_ksocket_generic_sockaddr_type.supertype->unparse)
  374                     (&ng_ksocket_generic_sockaddr_type,
  375                     data, off, cbuf, cbuflen);
  376         }
  377 }
  378 
  379 /* Parse type for struct sockaddr */
  380 static const struct ng_parse_type ng_ksocket_sockaddr_type = {
  381         NULL,
  382         NULL,
  383         NULL,
  384         &ng_ksocket_sockaddr_parse,
  385         &ng_ksocket_sockaddr_unparse,
  386         NULL            /* no such thing as a default struct sockaddr */
  387 };
  388 
  389 /************************************************************************
  390                 STRUCT NG_KSOCKET_SOCKOPT PARSE TYPE
  391  ************************************************************************/
  392 
  393 /* Get length of the struct ng_ksocket_sockopt value field, which is the
  394    just the excess of the message argument portion over the length of
  395    the struct ng_ksocket_sockopt. */
  396 static int
  397 ng_parse_sockoptval_getLength(const struct ng_parse_type *type,
  398         const u_char *start, const u_char *buf)
  399 {
  400         static const int offset = OFFSETOF(struct ng_ksocket_sockopt, value);
  401         const struct ng_ksocket_sockopt *sopt;
  402         const struct ng_mesg *msg;
  403 
  404         sopt = (const struct ng_ksocket_sockopt *)(buf - offset);
  405         msg = (const struct ng_mesg *)((const u_char *)sopt - sizeof(*msg));
  406         return msg->header.arglen - sizeof(*sopt);
  407 }
  408 
  409 /* Parse type for the option value part of a struct ng_ksocket_sockopt
  410    XXX Eventually, we should handle the different socket options specially.
  411    XXX This would avoid byte order problems, eg an integer value of 1 is
  412    XXX going to be "[1]" for little endian or "[3=1]" for big endian. */
  413 static const struct ng_parse_type ng_ksocket_sockoptval_type = {
  414         &ng_parse_bytearray_type,
  415         &ng_parse_sockoptval_getLength
  416 };
  417 
  418 /* Parse type for struct ng_ksocket_sockopt */
  419 static const struct ng_parse_struct_field ng_ksocket_sockopt_type_fields[]
  420         = NG_KSOCKET_SOCKOPT_INFO(&ng_ksocket_sockoptval_type);
  421 static const struct ng_parse_type ng_ksocket_sockopt_type = {
  422         &ng_parse_struct_type,
  423         &ng_ksocket_sockopt_type_fields
  424 };
  425 
  426 /* Parse type for struct ng_ksocket_accept */
  427 static const struct ng_parse_struct_field ng_ksocket_accept_type_fields[]
  428         = NGM_KSOCKET_ACCEPT_INFO;
  429 static const struct ng_parse_type ng_ksocket_accept_type = {
  430         &ng_parse_struct_type,
  431         &ng_ksocket_accept_type_fields
  432 };
  433 
  434 /* List of commands and how to convert arguments to/from ASCII */
  435 static const struct ng_cmdlist ng_ksocket_cmds[] = {
  436         {
  437           NGM_KSOCKET_COOKIE,
  438           NGM_KSOCKET_BIND,
  439           "bind",
  440           &ng_ksocket_sockaddr_type,
  441           NULL
  442         },
  443         {
  444           NGM_KSOCKET_COOKIE,
  445           NGM_KSOCKET_LISTEN,
  446           "listen",
  447           &ng_parse_int32_type,
  448           NULL
  449         },
  450         {
  451           NGM_KSOCKET_COOKIE,
  452           NGM_KSOCKET_ACCEPT,
  453           "accept",
  454           NULL,
  455           &ng_ksocket_accept_type
  456         },
  457         {
  458           NGM_KSOCKET_COOKIE,
  459           NGM_KSOCKET_CONNECT,
  460           "connect",
  461           &ng_ksocket_sockaddr_type,
  462           &ng_parse_int32_type
  463         },
  464         {
  465           NGM_KSOCKET_COOKIE,
  466           NGM_KSOCKET_GETNAME,
  467           "getname",
  468           NULL,
  469           &ng_ksocket_sockaddr_type
  470         },
  471         {
  472           NGM_KSOCKET_COOKIE,
  473           NGM_KSOCKET_GETPEERNAME,
  474           "getpeername",
  475           NULL,
  476           &ng_ksocket_sockaddr_type
  477         },
  478         {
  479           NGM_KSOCKET_COOKIE,
  480           NGM_KSOCKET_SETOPT,
  481           "setopt",
  482           &ng_ksocket_sockopt_type,
  483           NULL
  484         },
  485         {
  486           NGM_KSOCKET_COOKIE,
  487           NGM_KSOCKET_GETOPT,
  488           "getopt",
  489           &ng_ksocket_sockopt_type,
  490           &ng_ksocket_sockopt_type
  491         },
  492         { 0 }
  493 };
  494 
  495 /* Node type descriptor */
  496 static struct ng_type ng_ksocket_typestruct = {
  497         .version =      NG_ABI_VERSION,
  498         .name =         NG_KSOCKET_NODE_TYPE,
  499         .constructor =  ng_ksocket_constructor,
  500         .rcvmsg =       ng_ksocket_rcvmsg,
  501         .shutdown =     ng_ksocket_shutdown,
  502         .newhook =      ng_ksocket_newhook,
  503         .connect =      ng_ksocket_connect,
  504         .rcvdata =      ng_ksocket_rcvdata,
  505         .disconnect =   ng_ksocket_disconnect,
  506         .cmdlist =      ng_ksocket_cmds,
  507 };
  508 NETGRAPH_INIT(ksocket, &ng_ksocket_typestruct);
  509 
  510 #define ERROUT(x)       do { error = (x); goto done; } while (0)
  511 
  512 /************************************************************************
  513                         NETGRAPH NODE STUFF
  514  ************************************************************************/
  515 
  516 /*
  517  * Node type constructor
  518  * The NODE part is assumed to be all set up.
  519  * There is already a reference to the node for us.
  520  */
  521 static int
  522 ng_ksocket_constructor(node_p node)
  523 {
  524         priv_p priv;
  525 
  526         /* Allocate private structure */
  527         priv = malloc(sizeof(*priv), M_NETGRAPH_KSOCKET, M_WAITOK | M_ZERO);
  528 
  529         LIST_INIT(&priv->embryos);
  530         /* cross link them */
  531         priv->node = node;
  532         NG_NODE_SET_PRIVATE(node, priv);
  533 
  534         /* Done */
  535         return (0);
  536 }
  537 
  538 /*
  539  * Give our OK for a hook to be added. The hook name is of the
  540  * form "<family>/<type>/<proto>" where the three components may
  541  * be decimal numbers or else aliases from the above lists.
  542  *
  543  * Connecting a hook amounts to opening the socket.  Disconnecting
  544  * the hook closes the socket and destroys the node as well.
  545  */
  546 static int
  547 ng_ksocket_newhook(node_p node, hook_p hook, const char *name0)
  548 {
  549         struct thread *td = curthread;  /* XXX broken */
  550         const priv_p priv = NG_NODE_PRIVATE(node);
  551         char *s1, *s2, name[NG_HOOKSIZ];
  552         int family, type, protocol, error;
  553 
  554         /* Check if we're already connected */
  555         if (priv->hook != NULL)
  556                 return (EISCONN);
  557 
  558         if (priv->flags & KSF_CLONED) {
  559                 if (priv->flags & KSF_EMBRYONIC) {
  560                         /* Remove ourselves from our parent's embryo list */
  561                         LIST_REMOVE(priv, siblings);
  562                         priv->flags &= ~KSF_EMBRYONIC;
  563                 }
  564         } else {
  565                 /* Extract family, type, and protocol from hook name */
  566                 snprintf(name, sizeof(name), "%s", name0);
  567                 s1 = name;
  568                 if ((s2 = index(s1, '/')) == NULL)
  569                         return (EINVAL);
  570                 *s2++ = '\0';
  571                 family = ng_ksocket_parse(ng_ksocket_families, s1, 0);
  572                 if (family == -1)
  573                         return (EINVAL);
  574                 s1 = s2;
  575                 if ((s2 = index(s1, '/')) == NULL)
  576                         return (EINVAL);
  577                 *s2++ = '\0';
  578                 type = ng_ksocket_parse(ng_ksocket_types, s1, 0);
  579                 if (type == -1)
  580                         return (EINVAL);
  581                 s1 = s2;
  582                 protocol = ng_ksocket_parse(ng_ksocket_protos, s1, family);
  583                 if (protocol == -1)
  584                         return (EINVAL);
  585 
  586                 /* Create the socket */
  587                 error = socreate(family, &priv->so, type, protocol,
  588                    td->td_ucred, td);
  589                 if (error != 0)
  590                         return (error);
  591 
  592                 /* XXX call soreserve() ? */
  593 
  594         }
  595 
  596         /* OK */
  597         priv->hook = hook;
  598 
  599         /*
  600          * In case of misconfigured routing a packet may reenter
  601          * ksocket node recursively. Decouple stack to avoid possible
  602          * panics about sleeping with locks held.
  603          */
  604         NG_HOOK_FORCE_QUEUE(hook);
  605 
  606         return(0);
  607 }
  608 
  609 static int
  610 ng_ksocket_connect(hook_p hook)
  611 {
  612         node_p node = NG_HOOK_NODE(hook);
  613         const priv_p priv = NG_NODE_PRIVATE(node);
  614         struct socket *const so = priv->so;
  615 
  616         /* Add our hook for incoming data and other events */
  617         SOCKBUF_LOCK(&priv->so->so_rcv);
  618         soupcall_set(priv->so, SO_RCV, ng_ksocket_incoming, node);
  619         SOCKBUF_UNLOCK(&priv->so->so_rcv);
  620         SOCKBUF_LOCK(&priv->so->so_snd);
  621         soupcall_set(priv->so, SO_SND, ng_ksocket_incoming, node);
  622         SOCKBUF_UNLOCK(&priv->so->so_snd);
  623         SOCK_LOCK(priv->so);
  624         priv->so->so_state |= SS_NBIO;
  625         SOCK_UNLOCK(priv->so);
  626         /*
  627          * --Original comment--
  628          * On a cloned socket we may have already received one or more
  629          * upcalls which we couldn't handle without a hook.  Handle
  630          * those now.
  631          * We cannot call the upcall function directly
  632          * from here, because until this function has returned our
  633          * hook isn't connected.
  634          *
  635          * ---meta comment for -current ---
  636          * XXX This is dubius.
  637          * Upcalls between the time that the hook was
  638          * first created and now (on another processesor) will
  639          * be earlier on the queue than the request to finalise the hook.
  640          * By the time the hook is finalised,
  641          * The queued upcalls will have happenned and the code
  642          * will have discarded them because of a lack of a hook.
  643          * (socket not open).
  644          *
  645          * This is a bad byproduct of the complicated way in which hooks
  646          * are now created (3 daisy chained async events).
  647          *
  648          * Since we are a netgraph operation 
  649          * We know that we hold a lock on this node. This forces the
  650          * request we make below to be queued rather than implemented
  651          * immediatly which will cause the upcall function to be called a bit
  652          * later.
  653          * However, as we will run any waiting queued operations immediatly
  654          * after doing this one, if we have not finalised the other end
  655          * of the hook, those queued operations will fail.
  656          */
  657         if (priv->flags & KSF_CLONED) {
  658                 ng_send_fn(node, NULL, &ng_ksocket_incoming2, so, M_NOWAIT);
  659         }
  660 
  661         return (0);
  662 }
  663 
  664 /*
  665  * Receive a control message
  666  */
  667 static int
  668 ng_ksocket_rcvmsg(node_p node, item_p item, hook_p lasthook)
  669 {
  670         struct thread *td = curthread;  /* XXX broken */
  671         const priv_p priv = NG_NODE_PRIVATE(node);
  672         struct socket *const so = priv->so;
  673         struct ng_mesg *resp = NULL;
  674         int error = 0;
  675         struct ng_mesg *msg;
  676         ng_ID_t raddr;
  677 
  678         NGI_GET_MSG(item, msg);
  679         switch (msg->header.typecookie) {
  680         case NGM_KSOCKET_COOKIE:
  681                 switch (msg->header.cmd) {
  682                 case NGM_KSOCKET_BIND:
  683                     {
  684                         struct sockaddr *const sa
  685                             = (struct sockaddr *)msg->data;
  686 
  687                         /* Sanity check */
  688                         if (msg->header.arglen < SADATA_OFFSET
  689                             || msg->header.arglen < sa->sa_len)
  690                                 ERROUT(EINVAL);
  691                         if (so == NULL)
  692                                 ERROUT(ENXIO);
  693 
  694                         /* Bind */
  695                         error = sobind(so, sa, td);
  696                         break;
  697                     }
  698                 case NGM_KSOCKET_LISTEN:
  699                     {
  700                         /* Sanity check */
  701                         if (msg->header.arglen != sizeof(int32_t))
  702                                 ERROUT(EINVAL);
  703                         if (so == NULL)
  704                                 ERROUT(ENXIO);
  705 
  706                         /* Listen */
  707                         error = solisten(so, *((int32_t *)msg->data), td);
  708                         break;
  709                     }
  710 
  711                 case NGM_KSOCKET_ACCEPT:
  712                     {
  713                         /* Sanity check */
  714                         if (msg->header.arglen != 0)
  715                                 ERROUT(EINVAL);
  716                         if (so == NULL)
  717                                 ERROUT(ENXIO);
  718 
  719                         /* Make sure the socket is capable of accepting */
  720                         if (!(so->so_options & SO_ACCEPTCONN))
  721                                 ERROUT(EINVAL);
  722                         if (priv->flags & KSF_ACCEPTING)
  723                                 ERROUT(EALREADY);
  724 
  725                         error = ng_ksocket_check_accept(priv);
  726                         if (error != 0 && error != EWOULDBLOCK)
  727                                 ERROUT(error);
  728 
  729                         /*
  730                          * If a connection is already complete, take it.
  731                          * Otherwise let the upcall function deal with
  732                          * the connection when it comes in.
  733                          */
  734                         priv->response_token = msg->header.token;
  735                         raddr = priv->response_addr = NGI_RETADDR(item);
  736                         if (error == 0) {
  737                                 ng_ksocket_finish_accept(priv);
  738                         } else
  739                                 priv->flags |= KSF_ACCEPTING;
  740                         break;
  741                     }
  742 
  743                 case NGM_KSOCKET_CONNECT:
  744                     {
  745                         struct sockaddr *const sa
  746                             = (struct sockaddr *)msg->data;
  747 
  748                         /* Sanity check */
  749                         if (msg->header.arglen < SADATA_OFFSET
  750                             || msg->header.arglen < sa->sa_len)
  751                                 ERROUT(EINVAL);
  752                         if (so == NULL)
  753                                 ERROUT(ENXIO);
  754 
  755                         /* Do connect */
  756                         if ((so->so_state & SS_ISCONNECTING) != 0)
  757                                 ERROUT(EALREADY);
  758                         if ((error = soconnect(so, sa, td)) != 0) {
  759                                 so->so_state &= ~SS_ISCONNECTING;
  760                                 ERROUT(error);
  761                         }
  762                         if ((so->so_state & SS_ISCONNECTING) != 0) {
  763                                 /* We will notify the sender when we connect */
  764                                 priv->response_token = msg->header.token;
  765                                 raddr = priv->response_addr = NGI_RETADDR(item);
  766                                 priv->flags |= KSF_CONNECTING;
  767                                 ERROUT(EINPROGRESS);
  768                         }
  769                         break;
  770                     }
  771 
  772                 case NGM_KSOCKET_GETNAME:
  773                 case NGM_KSOCKET_GETPEERNAME:
  774                     {
  775                         int (*func)(struct socket *so, struct sockaddr **nam);
  776                         struct sockaddr *sa = NULL;
  777                         int len;
  778 
  779                         /* Sanity check */
  780                         if (msg->header.arglen != 0)
  781                                 ERROUT(EINVAL);
  782                         if (so == NULL)
  783                                 ERROUT(ENXIO);
  784 
  785                         /* Get function */
  786                         if (msg->header.cmd == NGM_KSOCKET_GETPEERNAME) {
  787                                 if ((so->so_state
  788                                     & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) 
  789                                         ERROUT(ENOTCONN);
  790                                 func = so->so_proto->pr_usrreqs->pru_peeraddr;
  791                         } else
  792                                 func = so->so_proto->pr_usrreqs->pru_sockaddr;
  793 
  794                         /* Get local or peer address */
  795                         if ((error = (*func)(so, &sa)) != 0)
  796                                 goto bail;
  797                         len = (sa == NULL) ? 0 : sa->sa_len;
  798 
  799                         /* Send it back in a response */
  800                         NG_MKRESPONSE(resp, msg, len, M_NOWAIT);
  801                         if (resp == NULL) {
  802                                 error = ENOMEM;
  803                                 goto bail;
  804                         }
  805                         bcopy(sa, resp->data, len);
  806 
  807                 bail:
  808                         /* Cleanup */
  809                         if (sa != NULL)
  810                                 free(sa, M_SONAME);
  811                         break;
  812                     }
  813 
  814                 case NGM_KSOCKET_GETOPT:
  815                     {
  816                         struct ng_ksocket_sockopt *ksopt = 
  817                             (struct ng_ksocket_sockopt *)msg->data;
  818                         struct sockopt sopt;
  819 
  820                         /* Sanity check */
  821                         if (msg->header.arglen != sizeof(*ksopt))
  822                                 ERROUT(EINVAL);
  823                         if (so == NULL)
  824                                 ERROUT(ENXIO);
  825 
  826                         /* Get response with room for option value */
  827                         NG_MKRESPONSE(resp, msg, sizeof(*ksopt)
  828                             + NG_KSOCKET_MAX_OPTLEN, M_NOWAIT);
  829                         if (resp == NULL)
  830                                 ERROUT(ENOMEM);
  831 
  832                         /* Get socket option, and put value in the response */
  833                         sopt.sopt_dir = SOPT_GET;
  834                         sopt.sopt_level = ksopt->level;
  835                         sopt.sopt_name = ksopt->name;
  836                         sopt.sopt_td = NULL;
  837                         sopt.sopt_valsize = NG_KSOCKET_MAX_OPTLEN;
  838                         ksopt = (struct ng_ksocket_sockopt *)resp->data;
  839                         sopt.sopt_val = ksopt->value;
  840                         if ((error = sogetopt(so, &sopt)) != 0) {
  841                                 NG_FREE_MSG(resp);
  842                                 break;
  843                         }
  844 
  845                         /* Set actual value length */
  846                         resp->header.arglen = sizeof(*ksopt)
  847                             + sopt.sopt_valsize;
  848                         break;
  849                     }
  850 
  851                 case NGM_KSOCKET_SETOPT:
  852                     {
  853                         struct ng_ksocket_sockopt *const ksopt = 
  854                             (struct ng_ksocket_sockopt *)msg->data;
  855                         const int valsize = msg->header.arglen - sizeof(*ksopt);
  856                         struct sockopt sopt;
  857 
  858                         /* Sanity check */
  859                         if (valsize < 0)
  860                                 ERROUT(EINVAL);
  861                         if (so == NULL)
  862                                 ERROUT(ENXIO);
  863 
  864                         /* Set socket option */
  865                         sopt.sopt_dir = SOPT_SET;
  866                         sopt.sopt_level = ksopt->level;
  867                         sopt.sopt_name = ksopt->name;
  868                         sopt.sopt_val = ksopt->value;
  869                         sopt.sopt_valsize = valsize;
  870                         sopt.sopt_td = NULL;
  871                         error = sosetopt(so, &sopt);
  872                         break;
  873                     }
  874 
  875                 default:
  876                         error = EINVAL;
  877                         break;
  878                 }
  879                 break;
  880         default:
  881                 error = EINVAL;
  882                 break;
  883         }
  884 done:
  885         NG_RESPOND_MSG(error, node, item, resp);
  886         NG_FREE_MSG(msg);
  887         return (error);
  888 }
  889 
  890 /*
  891  * Receive incoming data on our hook.  Send it out the socket.
  892  */
  893 static int
  894 ng_ksocket_rcvdata(hook_p hook, item_p item)
  895 {
  896         struct thread *td = curthread;  /* XXX broken */
  897         const node_p node = NG_HOOK_NODE(hook);
  898         const priv_p priv = NG_NODE_PRIVATE(node);
  899         struct socket *const so = priv->so;
  900         struct sockaddr *sa = NULL;
  901         int error;
  902         struct mbuf *m;
  903 #ifdef ALIGNED_POINTER
  904         struct mbuf *n;
  905 #endif /* ALIGNED_POINTER */
  906         struct sa_tag *stag;
  907 
  908         /* Extract data */
  909         NGI_GET_M(item, m);
  910         NG_FREE_ITEM(item);
  911 #ifdef ALIGNED_POINTER
  912         if (!ALIGNED_POINTER(mtod(m, caddr_t), uint32_t)) {
  913                 n = m_defrag(m, M_NOWAIT);
  914                 if (n == NULL) {
  915                         m_freem(m);
  916                         return (ENOBUFS);
  917                 }
  918                 m = n;
  919         }
  920 #endif /* ALIGNED_POINTER */
  921         /*
  922          * Look if socket address is stored in packet tags.
  923          * If sockaddr is ours, or provided by a third party (zero id),
  924          * then we accept it.
  925          */
  926         if (((stag = (struct sa_tag *)m_tag_locate(m, NGM_KSOCKET_COOKIE,
  927             NG_KSOCKET_TAG_SOCKADDR, NULL)) != NULL) &&
  928             (stag->id == NG_NODE_ID(node) || stag->id == 0))
  929                 sa = &stag->sa;
  930 
  931         /* Reset specific mbuf flags to prevent addressing problems. */
  932         m->m_flags &= ~(M_BCAST|M_MCAST);
  933 
  934         /* Send packet */
  935         error = sosend(so, sa, 0, m, 0, 0, td);
  936 
  937         return (error);
  938 }
  939 
  940 /*
  941  * Destroy node
  942  */
  943 static int
  944 ng_ksocket_shutdown(node_p node)
  945 {
  946         const priv_p priv = NG_NODE_PRIVATE(node);
  947         priv_p embryo;
  948 
  949         /* Close our socket (if any) */
  950         if (priv->so != NULL) {
  951                 SOCKBUF_LOCK(&priv->so->so_rcv);
  952                 soupcall_clear(priv->so, SO_RCV);
  953                 SOCKBUF_UNLOCK(&priv->so->so_rcv);
  954                 SOCKBUF_LOCK(&priv->so->so_snd);
  955                 soupcall_clear(priv->so, SO_SND);
  956                 SOCKBUF_UNLOCK(&priv->so->so_snd);
  957                 soclose(priv->so);
  958                 priv->so = NULL;
  959         }
  960 
  961         /* If we are an embryo, take ourselves out of the parent's list */
  962         if (priv->flags & KSF_EMBRYONIC) {
  963                 LIST_REMOVE(priv, siblings);
  964                 priv->flags &= ~KSF_EMBRYONIC;
  965         }
  966 
  967         /* Remove any embryonic children we have */
  968         while (!LIST_EMPTY(&priv->embryos)) {
  969                 embryo = LIST_FIRST(&priv->embryos);
  970                 ng_rmnode_self(embryo->node);
  971         }
  972 
  973         /* Take down netgraph node */
  974         bzero(priv, sizeof(*priv));
  975         free(priv, M_NETGRAPH_KSOCKET);
  976         NG_NODE_SET_PRIVATE(node, NULL);
  977         NG_NODE_UNREF(node);            /* let the node escape */
  978         return (0);
  979 }
  980 
  981 /*
  982  * Hook disconnection
  983  */
  984 static int
  985 ng_ksocket_disconnect(hook_p hook)
  986 {
  987         KASSERT(NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0,
  988             ("%s: numhooks=%d?", __func__,
  989             NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook))));
  990         if (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))
  991                 ng_rmnode_self(NG_HOOK_NODE(hook));
  992         return (0);
  993 }
  994 
  995 /************************************************************************
  996                         HELPER STUFF
  997  ************************************************************************/
  998 /* 
  999  * You should not "just call" a netgraph node function from an external
 1000  * asynchronous event. This is because in doing so you are ignoring the
 1001  * locking on the netgraph nodes. Instead call your function via ng_send_fn().
 1002  * This will call the function you chose, but will first do all the 
 1003  * locking rigmarole. Your function MAY only be called at some distant future
 1004  * time (several millisecs away) so don't give it any arguments
 1005  * that may be revoked soon (e.g. on your stack).
 1006  *
 1007  * To decouple stack, we use queue version of ng_send_fn().
 1008  */
 1009 
 1010 static int
 1011 ng_ksocket_incoming(struct socket *so, void *arg, int waitflag)
 1012 {
 1013         const node_p node = arg;
 1014         const priv_p priv = NG_NODE_PRIVATE(node);
 1015         int wait = ((waitflag & M_WAITOK) ? NG_WAITOK : 0) | NG_QUEUE;
 1016 
 1017         /*
 1018          * Even if node is not locked, as soon as we are called, we assume
 1019          * it exist and it's private area is valid. With some care we can
 1020          * access it. Mark node that incoming event for it was sent to
 1021          * avoid unneded queue trashing.
 1022          */
 1023         if (atomic_cmpset_int(&priv->fn_sent, 0, 1) &&
 1024             ng_send_fn1(node, NULL, &ng_ksocket_incoming2, so, 0, wait)) {
 1025                 atomic_store_rel_int(&priv->fn_sent, 0);
 1026         }
 1027         return (SU_OK);
 1028 }
 1029 
 1030 
 1031 /*
 1032  * When incoming data is appended to the socket, we get notified here.
 1033  * This is also called whenever a significant event occurs for the socket.
 1034  * Our original caller may have queued this even some time ago and 
 1035  * we cannot trust that he even still exists. The node however is being
 1036  * held with a reference by the queueing code and guarantied to be valid.
 1037  */
 1038 static void
 1039 ng_ksocket_incoming2(node_p node, hook_p hook, void *arg1, int arg2)
 1040 {
 1041         struct socket *so = arg1;
 1042         const priv_p priv = NG_NODE_PRIVATE(node);
 1043         struct mbuf *m;
 1044         struct ng_mesg *response;
 1045         struct uio auio;
 1046         int s, flags, error;
 1047 
 1048         s = splnet();
 1049 
 1050         /* so = priv->so; *//* XXX could have derived this like so */
 1051         KASSERT(so == priv->so, ("%s: wrong socket", __func__));
 1052         
 1053         /* Allow next incoming event to be queued. */
 1054         atomic_store_rel_int(&priv->fn_sent, 0);
 1055 
 1056         /* Check whether a pending connect operation has completed */
 1057         if (priv->flags & KSF_CONNECTING) {
 1058                 if ((error = so->so_error) != 0) {
 1059                         so->so_error = 0;
 1060                         so->so_state &= ~SS_ISCONNECTING;
 1061                 }
 1062                 if (!(so->so_state & SS_ISCONNECTING)) {
 1063                         NG_MKMESSAGE(response, NGM_KSOCKET_COOKIE,
 1064                             NGM_KSOCKET_CONNECT, sizeof(int32_t), M_NOWAIT);
 1065                         if (response != NULL) {
 1066                                 response->header.flags |= NGF_RESP;
 1067                                 response->header.token = priv->response_token;
 1068                                 *(int32_t *)response->data = error;
 1069                                 /* 
 1070                                  * send an async "response" message
 1071                                  * to the node that set us up
 1072                                  * (if it still exists)
 1073                                  */
 1074                                 NG_SEND_MSG_ID(error, node,
 1075                                     response, priv->response_addr, 0);
 1076                         }
 1077                         priv->flags &= ~KSF_CONNECTING;
 1078                 }
 1079         }
 1080 
 1081         /* Check whether a pending accept operation has completed */
 1082         if (priv->flags & KSF_ACCEPTING) {
 1083                 error = ng_ksocket_check_accept(priv);
 1084                 if (error != EWOULDBLOCK)
 1085                         priv->flags &= ~KSF_ACCEPTING;
 1086                 if (error == 0)
 1087                         ng_ksocket_finish_accept(priv);
 1088         }
 1089 
 1090         /*
 1091          * If we don't have a hook, we must handle data events later.  When
 1092          * the hook gets created and is connected, this upcall function
 1093          * will be called again.
 1094          */
 1095         if (priv->hook == NULL) {
 1096                 splx(s);
 1097                 return;
 1098         }
 1099 
 1100         /* Read and forward available mbuf's */
 1101         auio.uio_td = NULL;
 1102         auio.uio_resid = 1000000000;
 1103         flags = MSG_DONTWAIT;
 1104         while (1) {
 1105                 struct sockaddr *sa = NULL;
 1106                 struct mbuf *n;
 1107 
 1108                 /* Try to get next packet from socket */
 1109                 if ((error = soreceive(so, (so->so_state & SS_ISCONNECTED) ?
 1110                     NULL : &sa, &auio, &m, (struct mbuf **)0, &flags)) != 0)
 1111                         break;
 1112 
 1113                 /* See if we got anything */
 1114                 if (m == NULL) {
 1115                         if (sa != NULL)
 1116                                 free(sa, M_SONAME);
 1117                         break;
 1118                 }
 1119 
 1120                 /*
 1121                  * Don't trust the various socket layers to get the
 1122                  * packet header and length correct (e.g. kern/15175).
 1123                  *
 1124                  * Also, do not trust that soreceive() will clear m_nextpkt
 1125                  * for us (e.g. kern/84952, kern/82413).
 1126                  */
 1127                 m->m_pkthdr.csum_flags = 0;
 1128                 for (n = m, m->m_pkthdr.len = 0; n != NULL; n = n->m_next) {
 1129                         m->m_pkthdr.len += n->m_len;
 1130                         n->m_nextpkt = NULL;
 1131                 }
 1132 
 1133                 /* Put peer's socket address (if any) into a tag */
 1134                 if (sa != NULL) {
 1135                         struct sa_tag   *stag;
 1136 
 1137                         stag = (struct sa_tag *)m_tag_alloc(NGM_KSOCKET_COOKIE,
 1138                             NG_KSOCKET_TAG_SOCKADDR, sizeof(ng_ID_t) +
 1139                             sa->sa_len, M_NOWAIT);
 1140                         if (stag == NULL) {
 1141                                 free(sa, M_SONAME);
 1142                                 goto sendit;
 1143                         }
 1144                         bcopy(sa, &stag->sa, sa->sa_len);
 1145                         free(sa, M_SONAME);
 1146                         stag->id = NG_NODE_ID(node);
 1147                         m_tag_prepend(m, &stag->tag);
 1148                 }
 1149 
 1150 sendit:         /* Forward data with optional peer sockaddr as packet tag */
 1151                 NG_SEND_DATA_ONLY(error, priv->hook, m);
 1152         }
 1153 
 1154         /*
 1155          * If the peer has closed the connection, forward a 0-length mbuf
 1156          * to indicate end-of-file.
 1157          */
 1158         if (so->so_rcv.sb_state & SBS_CANTRCVMORE && !(priv->flags & KSF_EOFSEEN)) {
 1159                 MGETHDR(m, M_NOWAIT, MT_DATA);
 1160                 if (m != NULL) {
 1161                         m->m_len = m->m_pkthdr.len = 0;
 1162                         NG_SEND_DATA_ONLY(error, priv->hook, m);
 1163                 }
 1164                 priv->flags |= KSF_EOFSEEN;
 1165         }
 1166         splx(s);
 1167 }
 1168 
 1169 /*
 1170  * Check for a completed incoming connection and return 0 if one is found.
 1171  * Otherwise return the appropriate error code.
 1172  */
 1173 static int
 1174 ng_ksocket_check_accept(priv_p priv)
 1175 {
 1176         struct socket *const head = priv->so;
 1177         int error;
 1178 
 1179         if ((error = head->so_error) != 0) {
 1180                 head->so_error = 0;
 1181                 return error;
 1182         }
 1183         /* Unlocked read. */
 1184         if (TAILQ_EMPTY(&head->so_comp)) {
 1185                 if (head->so_rcv.sb_state & SBS_CANTRCVMORE)
 1186                         return ECONNABORTED;
 1187                 return EWOULDBLOCK;
 1188         }
 1189         return 0;
 1190 }
 1191 
 1192 /*
 1193  * Handle the first completed incoming connection, assumed to be already
 1194  * on the socket's so_comp queue.
 1195  */
 1196 static void
 1197 ng_ksocket_finish_accept(priv_p priv)
 1198 {
 1199         struct socket *const head = priv->so;
 1200         struct socket *so;
 1201         struct sockaddr *sa = NULL;
 1202         struct ng_mesg *resp;
 1203         struct ng_ksocket_accept *resp_data;
 1204         node_p node;
 1205         priv_p priv2;
 1206         int len;
 1207         int error;
 1208 
 1209         ACCEPT_LOCK();
 1210         so = TAILQ_FIRST(&head->so_comp);
 1211         if (so == NULL) {       /* Should never happen */
 1212                 ACCEPT_UNLOCK();
 1213                 return;
 1214         }
 1215         TAILQ_REMOVE(&head->so_comp, so, so_list);
 1216         head->so_qlen--;
 1217         so->so_qstate &= ~SQ_COMP;
 1218         so->so_head = NULL;
 1219         SOCK_LOCK(so);
 1220         soref(so);
 1221         so->so_state |= SS_NBIO;
 1222         SOCK_UNLOCK(so);
 1223         ACCEPT_UNLOCK();
 1224 
 1225         /* XXX KNOTE_UNLOCKED(&head->so_rcv.sb_sel.si_note, 0); */
 1226 
 1227         soaccept(so, &sa);
 1228 
 1229         len = OFFSETOF(struct ng_ksocket_accept, addr);
 1230         if (sa != NULL)
 1231                 len += sa->sa_len;
 1232 
 1233         NG_MKMESSAGE(resp, NGM_KSOCKET_COOKIE, NGM_KSOCKET_ACCEPT, len,
 1234             M_NOWAIT);
 1235         if (resp == NULL) {
 1236                 soclose(so);
 1237                 goto out;
 1238         }
 1239         resp->header.flags |= NGF_RESP;
 1240         resp->header.token = priv->response_token;
 1241 
 1242         /* Clone a ksocket node to wrap the new socket */
 1243         error = ng_make_node_common(&ng_ksocket_typestruct, &node);
 1244         if (error) {
 1245                 free(resp, M_NETGRAPH);
 1246                 soclose(so);
 1247                 goto out;
 1248         }
 1249 
 1250         if (ng_ksocket_constructor(node) != 0) {
 1251                 NG_NODE_UNREF(node);
 1252                 free(resp, M_NETGRAPH);
 1253                 soclose(so);
 1254                 goto out;
 1255         }
 1256 
 1257         priv2 = NG_NODE_PRIVATE(node);
 1258         priv2->so = so;
 1259         priv2->flags |= KSF_CLONED | KSF_EMBRYONIC;
 1260 
 1261         /*
 1262          * Insert the cloned node into a list of embryonic children
 1263          * on the parent node.  When a hook is created on the cloned
 1264          * node it will be removed from this list.  When the parent
 1265          * is destroyed it will destroy any embryonic children it has.
 1266          */
 1267         LIST_INSERT_HEAD(&priv->embryos, priv2, siblings);
 1268 
 1269         SOCKBUF_LOCK(&so->so_rcv);
 1270         soupcall_set(so, SO_RCV, ng_ksocket_incoming, node);
 1271         SOCKBUF_UNLOCK(&so->so_rcv);
 1272         SOCKBUF_LOCK(&so->so_snd);
 1273         soupcall_set(so, SO_SND, ng_ksocket_incoming, node);
 1274         SOCKBUF_UNLOCK(&so->so_snd);
 1275 
 1276         /* Fill in the response data and send it or return it to the caller */
 1277         resp_data = (struct ng_ksocket_accept *)resp->data;
 1278         resp_data->nodeid = NG_NODE_ID(node);
 1279         if (sa != NULL)
 1280                 bcopy(sa, &resp_data->addr, sa->sa_len);
 1281         NG_SEND_MSG_ID(error, node, resp, priv->response_addr, 0);
 1282 
 1283 out:
 1284         if (sa != NULL)
 1285                 free(sa, M_SONAME);
 1286 }
 1287 
 1288 /*
 1289  * Parse out either an integer value or an alias.
 1290  */
 1291 static int
 1292 ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
 1293         const char *s, int family)
 1294 {
 1295         int k, val;
 1296         char *eptr;
 1297 
 1298         /* Try aliases */
 1299         for (k = 0; aliases[k].name != NULL; k++) {
 1300                 if (strcmp(s, aliases[k].name) == 0
 1301                     && aliases[k].family == family)
 1302                         return aliases[k].value;
 1303         }
 1304 
 1305         /* Try parsing as a number */
 1306         val = (int)strtoul(s, &eptr, 10);
 1307         if (val < 0 || *eptr != '\0')
 1308                 return (-1);
 1309         return (val);
 1310 }
 1311 

Cache object: f44702dfc97aa6d65b8cabe6dd16931a


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.