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: releng/11.1/sys/netgraph/ng_ksocket.c 298813 2016-04-29 21:25:05Z pfg $
   41  * $Whistle: ng_ksocket.c,v 1.1 1999/11/16 20:04:40 archie Exp $
   42  */
   43 
   44 /*
   45  * Kernel socket node type.  This node type is basically a kernel-mode
   46  * version of a socket... kindof like the reverse of the socket node type.
   47  */
   48 
   49 #include <sys/param.h>
   50 #include <sys/systm.h>
   51 #include <sys/kernel.h>
   52 #include <sys/mbuf.h>
   53 #include <sys/proc.h>
   54 #include <sys/malloc.h>
   55 #include <sys/ctype.h>
   56 #include <sys/protosw.h>
   57 #include <sys/errno.h>
   58 #include <sys/socket.h>
   59 #include <sys/socketvar.h>
   60 #include <sys/uio.h>
   61 #include <sys/un.h>
   62 
   63 #include <netgraph/ng_message.h>
   64 #include <netgraph/netgraph.h>
   65 #include <netgraph/ng_parse.h>
   66 #include <netgraph/ng_ksocket.h>
   67 
   68 #include <netinet/in.h>
   69 #include <netinet/ip.h>
   70 
   71 #ifdef NG_SEPARATE_MALLOC
   72 static MALLOC_DEFINE(M_NETGRAPH_KSOCKET, "netgraph_ksock",
   73     "netgraph ksock node");
   74 #else
   75 #define M_NETGRAPH_KSOCKET M_NETGRAPH
   76 #endif
   77 
   78 #define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0))
   79 #define SADATA_OFFSET   (OFFSETOF(struct sockaddr, sa_data))
   80 
   81 /* Node private data */
   82 struct ng_ksocket_private {
   83         node_p          node;
   84         hook_p          hook;
   85         struct socket   *so;
   86         int             fn_sent;        /* FN call on incoming event was sent */
   87         LIST_HEAD(, ng_ksocket_private) embryos;
   88         LIST_ENTRY(ng_ksocket_private)  siblings;
   89         u_int32_t       flags;
   90         u_int32_t       response_token;
   91         ng_ID_t         response_addr;
   92 };
   93 typedef struct ng_ksocket_private *priv_p;
   94 
   95 /* Flags for priv_p */
   96 #define KSF_CONNECTING  0x00000001      /* Waiting for connection complete */
   97 #define KSF_ACCEPTING   0x00000002      /* Waiting for accept complete */
   98 #define KSF_EOFSEEN     0x00000004      /* Have sent 0-length EOF mbuf */
   99 #define KSF_CLONED      0x00000008      /* Cloned from an accepting socket */
  100 #define KSF_EMBRYONIC   0x00000010      /* Cloned node with no hooks yet */
  101 
  102 /* Netgraph node methods */
  103 static ng_constructor_t ng_ksocket_constructor;
  104 static ng_rcvmsg_t      ng_ksocket_rcvmsg;
  105 static ng_shutdown_t    ng_ksocket_shutdown;
  106 static ng_newhook_t     ng_ksocket_newhook;
  107 static ng_rcvdata_t     ng_ksocket_rcvdata;
  108 static ng_connect_t     ng_ksocket_connect;
  109 static ng_disconnect_t  ng_ksocket_disconnect;
  110 
  111 /* Alias structure */
  112 struct ng_ksocket_alias {
  113         const char      *name;
  114         const int       value;
  115         const int       family;
  116 };
  117 
  118 /* Protocol family aliases */
  119 static const struct ng_ksocket_alias ng_ksocket_families[] = {
  120         { "local",      PF_LOCAL        },
  121         { "inet",       PF_INET         },
  122         { "inet6",      PF_INET6        },
  123         { "atm",        PF_ATM          },
  124         { NULL,         -1              },
  125 };
  126 
  127 /* Socket type aliases */
  128 static const struct ng_ksocket_alias ng_ksocket_types[] = {
  129         { "stream",     SOCK_STREAM     },
  130         { "dgram",      SOCK_DGRAM      },
  131         { "raw",        SOCK_RAW        },
  132         { "rdm",        SOCK_RDM        },
  133         { "seqpacket",  SOCK_SEQPACKET  },
  134         { NULL,         -1              },
  135 };
  136 
  137 /* Protocol aliases */
  138 static const struct ng_ksocket_alias ng_ksocket_protos[] = {
  139         { "ip",         IPPROTO_IP,             PF_INET         },
  140         { "raw",        IPPROTO_RAW,            PF_INET         },
  141         { "icmp",       IPPROTO_ICMP,           PF_INET         },
  142         { "igmp",       IPPROTO_IGMP,           PF_INET         },
  143         { "tcp",        IPPROTO_TCP,            PF_INET         },
  144         { "udp",        IPPROTO_UDP,            PF_INET         },
  145         { "gre",        IPPROTO_GRE,            PF_INET         },
  146         { "esp",        IPPROTO_ESP,            PF_INET         },
  147         { "ah",         IPPROTO_AH,             PF_INET         },
  148         { "swipe",      IPPROTO_SWIPE,          PF_INET         },
  149         { "encap",      IPPROTO_ENCAP,          PF_INET         },
  150         { "divert",     IPPROTO_DIVERT,         PF_INET         },
  151         { "pim",        IPPROTO_PIM,            PF_INET         },
  152         { NULL,         -1                                      },
  153 };
  154 
  155 /* Helper functions */
  156 static int      ng_ksocket_check_accept(priv_p);
  157 static void     ng_ksocket_finish_accept(priv_p);
  158 static int      ng_ksocket_incoming(struct socket *so, void *arg, int waitflag);
  159 static int      ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
  160                         const char *s, int family);
  161 static void     ng_ksocket_incoming2(node_p node, hook_p hook,
  162                         void *arg1, int arg2);
  163 
  164 /************************************************************************
  165                         STRUCT SOCKADDR PARSE TYPE
  166  ************************************************************************/
  167 
  168 /* Get the length of the data portion of a generic struct sockaddr */
  169 static int
  170 ng_parse_generic_sockdata_getLength(const struct ng_parse_type *type,
  171         const u_char *start, const u_char *buf)
  172 {
  173         const struct sockaddr *sa;
  174 
  175         sa = (const struct sockaddr *)(buf - SADATA_OFFSET);
  176         return (sa->sa_len < SADATA_OFFSET) ? 0 : sa->sa_len - SADATA_OFFSET;
  177 }
  178 
  179 /* Type for the variable length data portion of a generic struct sockaddr */
  180 static const struct ng_parse_type ng_ksocket_generic_sockdata_type = {
  181         &ng_parse_bytearray_type,
  182         &ng_parse_generic_sockdata_getLength
  183 };
  184 
  185 /* Type for a generic struct sockaddr */
  186 static const struct ng_parse_struct_field
  187     ng_parse_generic_sockaddr_type_fields[] = {
  188           { "len",      &ng_parse_uint8_type                    },
  189           { "family",   &ng_parse_uint8_type                    },
  190           { "data",     &ng_ksocket_generic_sockdata_type       },
  191           { NULL }
  192 };
  193 static const struct ng_parse_type ng_ksocket_generic_sockaddr_type = {
  194         &ng_parse_struct_type,
  195         &ng_parse_generic_sockaddr_type_fields
  196 };
  197 
  198 /* Convert a struct sockaddr from ASCII to binary.  If its a protocol
  199    family that we specially handle, do that, otherwise defer to the
  200    generic parse type ng_ksocket_generic_sockaddr_type. */
  201 static int
  202 ng_ksocket_sockaddr_parse(const struct ng_parse_type *type,
  203         const char *s, int *off, const u_char *const start,
  204         u_char *const buf, int *buflen)
  205 {
  206         struct sockaddr *const sa = (struct sockaddr *)buf;
  207         enum ng_parse_token tok;
  208         char fambuf[32];
  209         int family, len;
  210         char *t;
  211 
  212         /* If next token is a left curly brace, use generic parse type */
  213         if ((tok = ng_parse_get_token(s, off, &len)) == T_LBRACE) {
  214                 return (*ng_ksocket_generic_sockaddr_type.supertype->parse)
  215                     (&ng_ksocket_generic_sockaddr_type,
  216                     s, off, start, buf, buflen);
  217         }
  218 
  219         /* Get socket address family followed by a slash */
  220         while (isspace(s[*off]))
  221                 (*off)++;
  222         if ((t = strchr(s + *off, '/')) == NULL)
  223                 return (EINVAL);
  224         if ((len = t - (s + *off)) > sizeof(fambuf) - 1)
  225                 return (EINVAL);
  226         strncpy(fambuf, s + *off, len);
  227         fambuf[len] = '\0';
  228         *off += len + 1;
  229         if ((family = ng_ksocket_parse(ng_ksocket_families, fambuf, 0)) == -1)
  230                 return (EINVAL);
  231 
  232         /* Set family */
  233         if (*buflen < SADATA_OFFSET)
  234                 return (ERANGE);
  235         sa->sa_family = family;
  236 
  237         /* Set family-specific data and length */
  238         switch (sa->sa_family) {
  239         case PF_LOCAL:          /* Get pathname */
  240             {
  241                 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
  242                 struct sockaddr_un *const sun = (struct sockaddr_un *)sa;
  243                 int toklen, pathlen;
  244                 char *path;
  245 
  246                 if ((path = ng_get_string_token(s, off, &toklen, NULL)) == NULL)
  247                         return (EINVAL);
  248                 pathlen = strlen(path);
  249                 if (pathlen > SOCK_MAXADDRLEN) {
  250                         free(path, M_NETGRAPH_KSOCKET);
  251                         return (E2BIG);
  252                 }
  253                 if (*buflen < pathoff + pathlen) {
  254                         free(path, M_NETGRAPH_KSOCKET);
  255                         return (ERANGE);
  256                 }
  257                 *off += toklen;
  258                 bcopy(path, sun->sun_path, pathlen);
  259                 sun->sun_len = pathoff + pathlen;
  260                 free(path, M_NETGRAPH_KSOCKET);
  261                 break;
  262             }
  263 
  264         case PF_INET:           /* Get an IP address with optional port */
  265             {
  266                 struct sockaddr_in *const sin = (struct sockaddr_in *)sa;
  267                 int i;
  268 
  269                 /* Parse this: <ipaddress>[:port] */
  270                 for (i = 0; i < 4; i++) {
  271                         u_long val;
  272                         char *eptr;
  273 
  274                         val = strtoul(s + *off, &eptr, 10);
  275                         if (val > 0xff || eptr == s + *off)
  276                                 return (EINVAL);
  277                         *off += (eptr - (s + *off));
  278                         ((u_char *)&sin->sin_addr)[i] = (u_char)val;
  279                         if (i < 3) {
  280                                 if (s[*off] != '.')
  281                                         return (EINVAL);
  282                                 (*off)++;
  283                         } else if (s[*off] == ':') {
  284                                 (*off)++;
  285                                 val = strtoul(s + *off, &eptr, 10);
  286                                 if (val > 0xffff || eptr == s + *off)
  287                                         return (EINVAL);
  288                                 *off += (eptr - (s + *off));
  289                                 sin->sin_port = htons(val);
  290                         } else
  291                                 sin->sin_port = 0;
  292                 }
  293                 bzero(&sin->sin_zero, sizeof(sin->sin_zero));
  294                 sin->sin_len = sizeof(*sin);
  295                 break;
  296             }
  297 
  298 #if 0
  299         case PF_INET6:  /* XXX implement this someday */
  300 #endif
  301 
  302         default:
  303                 return (EINVAL);
  304         }
  305 
  306         /* Done */
  307         *buflen = sa->sa_len;
  308         return (0);
  309 }
  310 
  311 /* Convert a struct sockaddr from binary to ASCII */
  312 static int
  313 ng_ksocket_sockaddr_unparse(const struct ng_parse_type *type,
  314         const u_char *data, int *off, char *cbuf, int cbuflen)
  315 {
  316         const struct sockaddr *sa = (const struct sockaddr *)(data + *off);
  317         int slen = 0;
  318 
  319         /* Output socket address, either in special or generic format */
  320         switch (sa->sa_family) {
  321         case PF_LOCAL:
  322             {
  323                 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
  324                 const struct sockaddr_un *sun = (const struct sockaddr_un *)sa;
  325                 const int pathlen = sun->sun_len - pathoff;
  326                 char pathbuf[SOCK_MAXADDRLEN + 1];
  327                 char *pathtoken;
  328 
  329                 bcopy(sun->sun_path, pathbuf, pathlen);
  330                 if ((pathtoken = ng_encode_string(pathbuf, pathlen)) == NULL)
  331                         return (ENOMEM);
  332                 slen += snprintf(cbuf, cbuflen, "local/%s", pathtoken);
  333                 free(pathtoken, M_NETGRAPH_KSOCKET);
  334                 if (slen >= cbuflen)
  335                         return (ERANGE);
  336                 *off += sun->sun_len;
  337                 return (0);
  338             }
  339 
  340         case PF_INET:
  341             {
  342                 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
  343 
  344                 slen += snprintf(cbuf, cbuflen, "inet/%d.%d.%d.%d",
  345                   ((const u_char *)&sin->sin_addr)[0],
  346                   ((const u_char *)&sin->sin_addr)[1],
  347                   ((const u_char *)&sin->sin_addr)[2],
  348                   ((const u_char *)&sin->sin_addr)[3]);
  349                 if (sin->sin_port != 0) {
  350                         slen += snprintf(cbuf + strlen(cbuf),
  351                             cbuflen - strlen(cbuf), ":%d",
  352                             (u_int)ntohs(sin->sin_port));
  353                 }
  354                 if (slen >= cbuflen)
  355                         return (ERANGE);
  356                 *off += sizeof(*sin);
  357                 return(0);
  358             }
  359 
  360 #if 0
  361         case PF_INET6:  /* XXX implement this someday */
  362 #endif
  363 
  364         default:
  365                 return (*ng_ksocket_generic_sockaddr_type.supertype->unparse)
  366                     (&ng_ksocket_generic_sockaddr_type,
  367                     data, off, cbuf, cbuflen);
  368         }
  369 }
  370 
  371 /* Parse type for struct sockaddr */
  372 static const struct ng_parse_type ng_ksocket_sockaddr_type = {
  373         NULL,
  374         NULL,
  375         NULL,
  376         &ng_ksocket_sockaddr_parse,
  377         &ng_ksocket_sockaddr_unparse,
  378         NULL            /* no such thing as a default struct sockaddr */
  379 };
  380 
  381 /************************************************************************
  382                 STRUCT NG_KSOCKET_SOCKOPT PARSE TYPE
  383  ************************************************************************/
  384 
  385 /* Get length of the struct ng_ksocket_sockopt value field, which is the
  386    just the excess of the message argument portion over the length of
  387    the struct ng_ksocket_sockopt. */
  388 static int
  389 ng_parse_sockoptval_getLength(const struct ng_parse_type *type,
  390         const u_char *start, const u_char *buf)
  391 {
  392         static const int offset = OFFSETOF(struct ng_ksocket_sockopt, value);
  393         const struct ng_ksocket_sockopt *sopt;
  394         const struct ng_mesg *msg;
  395 
  396         sopt = (const struct ng_ksocket_sockopt *)(buf - offset);
  397         msg = (const struct ng_mesg *)((const u_char *)sopt - sizeof(*msg));
  398         return msg->header.arglen - sizeof(*sopt);
  399 }
  400 
  401 /* Parse type for the option value part of a struct ng_ksocket_sockopt
  402    XXX Eventually, we should handle the different socket options specially.
  403    XXX This would avoid byte order problems, eg an integer value of 1 is
  404    XXX going to be "[1]" for little endian or "[3=1]" for big endian. */
  405 static const struct ng_parse_type ng_ksocket_sockoptval_type = {
  406         &ng_parse_bytearray_type,
  407         &ng_parse_sockoptval_getLength
  408 };
  409 
  410 /* Parse type for struct ng_ksocket_sockopt */
  411 static const struct ng_parse_struct_field ng_ksocket_sockopt_type_fields[]
  412         = NG_KSOCKET_SOCKOPT_INFO(&ng_ksocket_sockoptval_type);
  413 static const struct ng_parse_type ng_ksocket_sockopt_type = {
  414         &ng_parse_struct_type,
  415         &ng_ksocket_sockopt_type_fields
  416 };
  417 
  418 /* Parse type for struct ng_ksocket_accept */
  419 static const struct ng_parse_struct_field ng_ksocket_accept_type_fields[]
  420         = NGM_KSOCKET_ACCEPT_INFO;
  421 static const struct ng_parse_type ng_ksocket_accept_type = {
  422         &ng_parse_struct_type,
  423         &ng_ksocket_accept_type_fields
  424 };
  425 
  426 /* List of commands and how to convert arguments to/from ASCII */
  427 static const struct ng_cmdlist ng_ksocket_cmds[] = {
  428         {
  429           NGM_KSOCKET_COOKIE,
  430           NGM_KSOCKET_BIND,
  431           "bind",
  432           &ng_ksocket_sockaddr_type,
  433           NULL
  434         },
  435         {
  436           NGM_KSOCKET_COOKIE,
  437           NGM_KSOCKET_LISTEN,
  438           "listen",
  439           &ng_parse_int32_type,
  440           NULL
  441         },
  442         {
  443           NGM_KSOCKET_COOKIE,
  444           NGM_KSOCKET_ACCEPT,
  445           "accept",
  446           NULL,
  447           &ng_ksocket_accept_type
  448         },
  449         {
  450           NGM_KSOCKET_COOKIE,
  451           NGM_KSOCKET_CONNECT,
  452           "connect",
  453           &ng_ksocket_sockaddr_type,
  454           &ng_parse_int32_type
  455         },
  456         {
  457           NGM_KSOCKET_COOKIE,
  458           NGM_KSOCKET_GETNAME,
  459           "getname",
  460           NULL,
  461           &ng_ksocket_sockaddr_type
  462         },
  463         {
  464           NGM_KSOCKET_COOKIE,
  465           NGM_KSOCKET_GETPEERNAME,
  466           "getpeername",
  467           NULL,
  468           &ng_ksocket_sockaddr_type
  469         },
  470         {
  471           NGM_KSOCKET_COOKIE,
  472           NGM_KSOCKET_SETOPT,
  473           "setopt",
  474           &ng_ksocket_sockopt_type,
  475           NULL
  476         },
  477         {
  478           NGM_KSOCKET_COOKIE,
  479           NGM_KSOCKET_GETOPT,
  480           "getopt",
  481           &ng_ksocket_sockopt_type,
  482           &ng_ksocket_sockopt_type
  483         },
  484         { 0 }
  485 };
  486 
  487 /* Node type descriptor */
  488 static struct ng_type ng_ksocket_typestruct = {
  489         .version =      NG_ABI_VERSION,
  490         .name =         NG_KSOCKET_NODE_TYPE,
  491         .constructor =  ng_ksocket_constructor,
  492         .rcvmsg =       ng_ksocket_rcvmsg,
  493         .shutdown =     ng_ksocket_shutdown,
  494         .newhook =      ng_ksocket_newhook,
  495         .connect =      ng_ksocket_connect,
  496         .rcvdata =      ng_ksocket_rcvdata,
  497         .disconnect =   ng_ksocket_disconnect,
  498         .cmdlist =      ng_ksocket_cmds,
  499 };
  500 NETGRAPH_INIT(ksocket, &ng_ksocket_typestruct);
  501 
  502 #define ERROUT(x)       do { error = (x); goto done; } while (0)
  503 
  504 /************************************************************************
  505                         NETGRAPH NODE STUFF
  506  ************************************************************************/
  507 
  508 /*
  509  * Node type constructor
  510  * The NODE part is assumed to be all set up.
  511  * There is already a reference to the node for us.
  512  */
  513 static int
  514 ng_ksocket_constructor(node_p node)
  515 {
  516         priv_p priv;
  517 
  518         /* Allocate private structure */
  519         priv = malloc(sizeof(*priv), M_NETGRAPH_KSOCKET, M_NOWAIT | M_ZERO);
  520         if (priv == NULL)
  521                 return (ENOMEM);
  522 
  523         LIST_INIT(&priv->embryos);
  524         /* cross link them */
  525         priv->node = node;
  526         NG_NODE_SET_PRIVATE(node, priv);
  527 
  528         /* Done */
  529         return (0);
  530 }
  531 
  532 /*
  533  * Give our OK for a hook to be added. The hook name is of the
  534  * form "<family>/<type>/<proto>" where the three components may
  535  * be decimal numbers or else aliases from the above lists.
  536  *
  537  * Connecting a hook amounts to opening the socket.  Disconnecting
  538  * the hook closes the socket and destroys the node as well.
  539  */
  540 static int
  541 ng_ksocket_newhook(node_p node, hook_p hook, const char *name0)
  542 {
  543         struct thread *td = curthread;  /* XXX broken */
  544         const priv_p priv = NG_NODE_PRIVATE(node);
  545         char *s1, *s2, name[NG_HOOKSIZ];
  546         int family, type, protocol, error;
  547 
  548         /* Check if we're already connected */
  549         if (priv->hook != NULL)
  550                 return (EISCONN);
  551 
  552         if (priv->flags & KSF_CLONED) {
  553                 if (priv->flags & KSF_EMBRYONIC) {
  554                         /* Remove ourselves from our parent's embryo list */
  555                         LIST_REMOVE(priv, siblings);
  556                         priv->flags &= ~KSF_EMBRYONIC;
  557                 }
  558         } else {
  559                 /* Extract family, type, and protocol from hook name */
  560                 snprintf(name, sizeof(name), "%s", name0);
  561                 s1 = name;
  562                 if ((s2 = strchr(s1, '/')) == NULL)
  563                         return (EINVAL);
  564                 *s2++ = '\0';
  565                 family = ng_ksocket_parse(ng_ksocket_families, s1, 0);
  566                 if (family == -1)
  567                         return (EINVAL);
  568                 s1 = s2;
  569                 if ((s2 = strchr(s1, '/')) == NULL)
  570                         return (EINVAL);
  571                 *s2++ = '\0';
  572                 type = ng_ksocket_parse(ng_ksocket_types, s1, 0);
  573                 if (type == -1)
  574                         return (EINVAL);
  575                 s1 = s2;
  576                 protocol = ng_ksocket_parse(ng_ksocket_protos, s1, family);
  577                 if (protocol == -1)
  578                         return (EINVAL);
  579 
  580                 /* Create the socket */
  581                 error = socreate(family, &priv->so, type, protocol,
  582                    td->td_ucred, td);
  583                 if (error != 0)
  584                         return (error);
  585 
  586                 /* XXX call soreserve() ? */
  587 
  588         }
  589 
  590         /* OK */
  591         priv->hook = hook;
  592 
  593         /*
  594          * In case of misconfigured routing a packet may reenter
  595          * ksocket node recursively. Decouple stack to avoid possible
  596          * panics about sleeping with locks held.
  597          */
  598         NG_HOOK_FORCE_QUEUE(hook);
  599 
  600         return(0);
  601 }
  602 
  603 static int
  604 ng_ksocket_connect(hook_p hook)
  605 {
  606         node_p node = NG_HOOK_NODE(hook);
  607         const priv_p priv = NG_NODE_PRIVATE(node);
  608         struct socket *const so = priv->so;
  609 
  610         /* Add our hook for incoming data and other events */
  611         SOCKBUF_LOCK(&priv->so->so_rcv);
  612         soupcall_set(priv->so, SO_RCV, ng_ksocket_incoming, node);
  613         SOCKBUF_UNLOCK(&priv->so->so_rcv);
  614         SOCKBUF_LOCK(&priv->so->so_snd);
  615         soupcall_set(priv->so, SO_SND, ng_ksocket_incoming, node);
  616         SOCKBUF_UNLOCK(&priv->so->so_snd);
  617         SOCK_LOCK(priv->so);
  618         priv->so->so_state |= SS_NBIO;
  619         SOCK_UNLOCK(priv->so);
  620         /*
  621          * --Original comment--
  622          * On a cloned socket we may have already received one or more
  623          * upcalls which we couldn't handle without a hook.  Handle
  624          * those now.
  625          * We cannot call the upcall function directly
  626          * from here, because until this function has returned our
  627          * hook isn't connected.
  628          *
  629          * ---meta comment for -current ---
  630          * XXX This is dubius.
  631          * Upcalls between the time that the hook was
  632          * first created and now (on another processesor) will
  633          * be earlier on the queue than the request to finalise the hook.
  634          * By the time the hook is finalised,
  635          * The queued upcalls will have happened and the code
  636          * will have discarded them because of a lack of a hook.
  637          * (socket not open).
  638          *
  639          * This is a bad byproduct of the complicated way in which hooks
  640          * are now created (3 daisy chained async events).
  641          *
  642          * Since we are a netgraph operation
  643          * We know that we hold a lock on this node. This forces the
  644          * request we make below to be queued rather than implemented
  645          * immediately which will cause the upcall function to be called a bit
  646          * later.
  647          * However, as we will run any waiting queued operations immediately
  648          * after doing this one, if we have not finalised the other end
  649          * of the hook, those queued operations will fail.
  650          */
  651         if (priv->flags & KSF_CLONED) {
  652                 ng_send_fn(node, NULL, &ng_ksocket_incoming2, so, M_NOWAIT);
  653         }
  654 
  655         return (0);
  656 }
  657 
  658 /*
  659  * Receive a control message
  660  */
  661 static int
  662 ng_ksocket_rcvmsg(node_p node, item_p item, hook_p lasthook)
  663 {
  664         struct thread *td = curthread;  /* XXX broken */
  665         const priv_p priv = NG_NODE_PRIVATE(node);
  666         struct socket *const so = priv->so;
  667         struct ng_mesg *resp = NULL;
  668         int error = 0;
  669         struct ng_mesg *msg;
  670         ng_ID_t raddr;
  671 
  672         NGI_GET_MSG(item, msg);
  673         switch (msg->header.typecookie) {
  674         case NGM_KSOCKET_COOKIE:
  675                 switch (msg->header.cmd) {
  676                 case NGM_KSOCKET_BIND:
  677                     {
  678                         struct sockaddr *const sa
  679                             = (struct sockaddr *)msg->data;
  680 
  681                         /* Sanity check */
  682                         if (msg->header.arglen < SADATA_OFFSET
  683                             || msg->header.arglen < sa->sa_len)
  684                                 ERROUT(EINVAL);
  685                         if (so == NULL)
  686                                 ERROUT(ENXIO);
  687 
  688                         /* Bind */
  689                         error = sobind(so, sa, td);
  690                         break;
  691                     }
  692                 case NGM_KSOCKET_LISTEN:
  693                     {
  694                         /* Sanity check */
  695                         if (msg->header.arglen != sizeof(int32_t))
  696                                 ERROUT(EINVAL);
  697                         if (so == NULL)
  698                                 ERROUT(ENXIO);
  699 
  700                         /* Listen */
  701                         error = solisten(so, *((int32_t *)msg->data), td);
  702                         break;
  703                     }
  704 
  705                 case NGM_KSOCKET_ACCEPT:
  706                     {
  707                         /* Sanity check */
  708                         if (msg->header.arglen != 0)
  709                                 ERROUT(EINVAL);
  710                         if (so == NULL)
  711                                 ERROUT(ENXIO);
  712 
  713                         /* Make sure the socket is capable of accepting */
  714                         if (!(so->so_options & SO_ACCEPTCONN))
  715                                 ERROUT(EINVAL);
  716                         if (priv->flags & KSF_ACCEPTING)
  717                                 ERROUT(EALREADY);
  718 
  719                         error = ng_ksocket_check_accept(priv);
  720                         if (error != 0 && error != EWOULDBLOCK)
  721                                 ERROUT(error);
  722 
  723                         /*
  724                          * If a connection is already complete, take it.
  725                          * Otherwise let the upcall function deal with
  726                          * the connection when it comes in.
  727                          */
  728                         priv->response_token = msg->header.token;
  729                         raddr = priv->response_addr = NGI_RETADDR(item);
  730                         if (error == 0) {
  731                                 ng_ksocket_finish_accept(priv);
  732                         } else
  733                                 priv->flags |= KSF_ACCEPTING;
  734                         break;
  735                     }
  736 
  737                 case NGM_KSOCKET_CONNECT:
  738                     {
  739                         struct sockaddr *const sa
  740                             = (struct sockaddr *)msg->data;
  741 
  742                         /* Sanity check */
  743                         if (msg->header.arglen < SADATA_OFFSET
  744                             || msg->header.arglen < sa->sa_len)
  745                                 ERROUT(EINVAL);
  746                         if (so == NULL)
  747                                 ERROUT(ENXIO);
  748 
  749                         /* Do connect */
  750                         if ((so->so_state & SS_ISCONNECTING) != 0)
  751                                 ERROUT(EALREADY);
  752                         if ((error = soconnect(so, sa, td)) != 0) {
  753                                 so->so_state &= ~SS_ISCONNECTING;
  754                                 ERROUT(error);
  755                         }
  756                         if ((so->so_state & SS_ISCONNECTING) != 0) {
  757                                 /* We will notify the sender when we connect */
  758                                 priv->response_token = msg->header.token;
  759                                 raddr = priv->response_addr = NGI_RETADDR(item);
  760                                 priv->flags |= KSF_CONNECTING;
  761                                 ERROUT(EINPROGRESS);
  762                         }
  763                         break;
  764                     }
  765 
  766                 case NGM_KSOCKET_GETNAME:
  767                 case NGM_KSOCKET_GETPEERNAME:
  768                     {
  769                         int (*func)(struct socket *so, struct sockaddr **nam);
  770                         struct sockaddr *sa = NULL;
  771                         int len;
  772 
  773                         /* Sanity check */
  774                         if (msg->header.arglen != 0)
  775                                 ERROUT(EINVAL);
  776                         if (so == NULL)
  777                                 ERROUT(ENXIO);
  778 
  779                         /* Get function */
  780                         if (msg->header.cmd == NGM_KSOCKET_GETPEERNAME) {
  781                                 if ((so->so_state
  782                                     & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0)
  783                                         ERROUT(ENOTCONN);
  784                                 func = so->so_proto->pr_usrreqs->pru_peeraddr;
  785                         } else
  786                                 func = so->so_proto->pr_usrreqs->pru_sockaddr;
  787 
  788                         /* Get local or peer address */
  789                         if ((error = (*func)(so, &sa)) != 0)
  790                                 goto bail;
  791                         len = (sa == NULL) ? 0 : sa->sa_len;
  792 
  793                         /* Send it back in a response */
  794                         NG_MKRESPONSE(resp, msg, len, M_NOWAIT);
  795                         if (resp == NULL) {
  796                                 error = ENOMEM;
  797                                 goto bail;
  798                         }
  799                         bcopy(sa, resp->data, len);
  800 
  801                 bail:
  802                         /* Cleanup */
  803                         if (sa != NULL)
  804                                 free(sa, M_SONAME);
  805                         break;
  806                     }
  807 
  808                 case NGM_KSOCKET_GETOPT:
  809                     {
  810                         struct ng_ksocket_sockopt *ksopt =
  811                             (struct ng_ksocket_sockopt *)msg->data;
  812                         struct sockopt sopt;
  813 
  814                         /* Sanity check */
  815                         if (msg->header.arglen != sizeof(*ksopt))
  816                                 ERROUT(EINVAL);
  817                         if (so == NULL)
  818                                 ERROUT(ENXIO);
  819 
  820                         /* Get response with room for option value */
  821                         NG_MKRESPONSE(resp, msg, sizeof(*ksopt)
  822                             + NG_KSOCKET_MAX_OPTLEN, M_NOWAIT);
  823                         if (resp == NULL)
  824                                 ERROUT(ENOMEM);
  825 
  826                         /* Get socket option, and put value in the response */
  827                         sopt.sopt_dir = SOPT_GET;
  828                         sopt.sopt_level = ksopt->level;
  829                         sopt.sopt_name = ksopt->name;
  830                         sopt.sopt_td = NULL;
  831                         sopt.sopt_valsize = NG_KSOCKET_MAX_OPTLEN;
  832                         ksopt = (struct ng_ksocket_sockopt *)resp->data;
  833                         sopt.sopt_val = ksopt->value;
  834                         if ((error = sogetopt(so, &sopt)) != 0) {
  835                                 NG_FREE_MSG(resp);
  836                                 break;
  837                         }
  838 
  839                         /* Set actual value length */
  840                         resp->header.arglen = sizeof(*ksopt)
  841                             + sopt.sopt_valsize;
  842                         break;
  843                     }
  844 
  845                 case NGM_KSOCKET_SETOPT:
  846                     {
  847                         struct ng_ksocket_sockopt *const ksopt =
  848                             (struct ng_ksocket_sockopt *)msg->data;
  849                         const int valsize = msg->header.arglen - sizeof(*ksopt);
  850                         struct sockopt sopt;
  851 
  852                         /* Sanity check */
  853                         if (valsize < 0)
  854                                 ERROUT(EINVAL);
  855                         if (so == NULL)
  856                                 ERROUT(ENXIO);
  857 
  858                         /* Set socket option */
  859                         sopt.sopt_dir = SOPT_SET;
  860                         sopt.sopt_level = ksopt->level;
  861                         sopt.sopt_name = ksopt->name;
  862                         sopt.sopt_val = ksopt->value;
  863                         sopt.sopt_valsize = valsize;
  864                         sopt.sopt_td = NULL;
  865                         error = sosetopt(so, &sopt);
  866                         break;
  867                     }
  868 
  869                 default:
  870                         error = EINVAL;
  871                         break;
  872                 }
  873                 break;
  874         default:
  875                 error = EINVAL;
  876                 break;
  877         }
  878 done:
  879         NG_RESPOND_MSG(error, node, item, resp);
  880         NG_FREE_MSG(msg);
  881         return (error);
  882 }
  883 
  884 /*
  885  * Receive incoming data on our hook.  Send it out the socket.
  886  */
  887 static int
  888 ng_ksocket_rcvdata(hook_p hook, item_p item)
  889 {
  890         struct thread *td = curthread;  /* XXX broken */
  891         const node_p node = NG_HOOK_NODE(hook);
  892         const priv_p priv = NG_NODE_PRIVATE(node);
  893         struct socket *const so = priv->so;
  894         struct sockaddr *sa = NULL;
  895         int error;
  896         struct mbuf *m;
  897 #ifdef ALIGNED_POINTER
  898         struct mbuf *n;
  899 #endif /* ALIGNED_POINTER */
  900         struct sa_tag *stag;
  901 
  902         /* Extract data */
  903         NGI_GET_M(item, m);
  904         NG_FREE_ITEM(item);
  905 #ifdef ALIGNED_POINTER
  906         if (!ALIGNED_POINTER(mtod(m, caddr_t), uint32_t)) {
  907                 n = m_defrag(m, M_NOWAIT);
  908                 if (n == NULL) {
  909                         m_freem(m);
  910                         return (ENOBUFS);
  911                 }
  912                 m = n;
  913         }
  914 #endif /* ALIGNED_POINTER */
  915         /*
  916          * Look if socket address is stored in packet tags.
  917          * If sockaddr is ours, or provided by a third party (zero id),
  918          * then we accept it.
  919          */
  920         if (((stag = (struct sa_tag *)m_tag_locate(m, NGM_KSOCKET_COOKIE,
  921             NG_KSOCKET_TAG_SOCKADDR, NULL)) != NULL) &&
  922             (stag->id == NG_NODE_ID(node) || stag->id == 0))
  923                 sa = &stag->sa;
  924 
  925         /* Reset specific mbuf flags to prevent addressing problems. */
  926         m->m_flags &= ~(M_BCAST|M_MCAST);
  927 
  928         /* Send packet */
  929         error = sosend(so, sa, 0, m, 0, 0, td);
  930 
  931         return (error);
  932 }
  933 
  934 /*
  935  * Destroy node
  936  */
  937 static int
  938 ng_ksocket_shutdown(node_p node)
  939 {
  940         const priv_p priv = NG_NODE_PRIVATE(node);
  941         priv_p embryo;
  942 
  943         /* Close our socket (if any) */
  944         if (priv->so != NULL) {
  945                 SOCKBUF_LOCK(&priv->so->so_rcv);
  946                 soupcall_clear(priv->so, SO_RCV);
  947                 SOCKBUF_UNLOCK(&priv->so->so_rcv);
  948                 SOCKBUF_LOCK(&priv->so->so_snd);
  949                 soupcall_clear(priv->so, SO_SND);
  950                 SOCKBUF_UNLOCK(&priv->so->so_snd);
  951                 soclose(priv->so);
  952                 priv->so = NULL;
  953         }
  954 
  955         /* If we are an embryo, take ourselves out of the parent's list */
  956         if (priv->flags & KSF_EMBRYONIC) {
  957                 LIST_REMOVE(priv, siblings);
  958                 priv->flags &= ~KSF_EMBRYONIC;
  959         }
  960 
  961         /* Remove any embryonic children we have */
  962         while (!LIST_EMPTY(&priv->embryos)) {
  963                 embryo = LIST_FIRST(&priv->embryos);
  964                 ng_rmnode_self(embryo->node);
  965         }
  966 
  967         /* Take down netgraph node */
  968         bzero(priv, sizeof(*priv));
  969         free(priv, M_NETGRAPH_KSOCKET);
  970         NG_NODE_SET_PRIVATE(node, NULL);
  971         NG_NODE_UNREF(node);            /* let the node escape */
  972         return (0);
  973 }
  974 
  975 /*
  976  * Hook disconnection
  977  */
  978 static int
  979 ng_ksocket_disconnect(hook_p hook)
  980 {
  981         KASSERT(NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0,
  982             ("%s: numhooks=%d?", __func__,
  983             NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook))));
  984         if (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))
  985                 ng_rmnode_self(NG_HOOK_NODE(hook));
  986         return (0);
  987 }
  988 
  989 /************************************************************************
  990                         HELPER STUFF
  991  ************************************************************************/
  992 /*
  993  * You should not "just call" a netgraph node function from an external
  994  * asynchronous event. This is because in doing so you are ignoring the
  995  * locking on the netgraph nodes. Instead call your function via ng_send_fn().
  996  * This will call the function you chose, but will first do all the
  997  * locking rigmarole. Your function MAY only be called at some distant future
  998  * time (several millisecs away) so don't give it any arguments
  999  * that may be revoked soon (e.g. on your stack).
 1000  *
 1001  * To decouple stack, we use queue version of ng_send_fn().
 1002  */
 1003 
 1004 static int
 1005 ng_ksocket_incoming(struct socket *so, void *arg, int waitflag)
 1006 {
 1007         const node_p node = arg;
 1008         const priv_p priv = NG_NODE_PRIVATE(node);
 1009         int wait = ((waitflag & M_WAITOK) ? NG_WAITOK : 0) | NG_QUEUE;
 1010 
 1011         /*
 1012          * Even if node is not locked, as soon as we are called, we assume
 1013          * it exist and it's private area is valid. With some care we can
 1014          * access it. Mark node that incoming event for it was sent to
 1015          * avoid unneded queue trashing.
 1016          */
 1017         if (atomic_cmpset_int(&priv->fn_sent, 0, 1) &&
 1018             ng_send_fn1(node, NULL, &ng_ksocket_incoming2, so, 0, wait)) {
 1019                 atomic_store_rel_int(&priv->fn_sent, 0);
 1020         }
 1021         return (SU_OK);
 1022 }
 1023 
 1024 
 1025 /*
 1026  * When incoming data is appended to the socket, we get notified here.
 1027  * This is also called whenever a significant event occurs for the socket.
 1028  * Our original caller may have queued this even some time ago and
 1029  * we cannot trust that he even still exists. The node however is being
 1030  * held with a reference by the queueing code and guarantied to be valid.
 1031  */
 1032 static void
 1033 ng_ksocket_incoming2(node_p node, hook_p hook, void *arg1, int arg2)
 1034 {
 1035         struct socket *so = arg1;
 1036         const priv_p priv = NG_NODE_PRIVATE(node);
 1037         struct ng_mesg *response;
 1038         int error;
 1039 
 1040         KASSERT(so == priv->so, ("%s: wrong socket", __func__));
 1041 
 1042         /* Allow next incoming event to be queued. */
 1043         atomic_store_rel_int(&priv->fn_sent, 0);
 1044 
 1045         /* Check whether a pending connect operation has completed */
 1046         if (priv->flags & KSF_CONNECTING) {
 1047                 if ((error = so->so_error) != 0) {
 1048                         so->so_error = 0;
 1049                         so->so_state &= ~SS_ISCONNECTING;
 1050                 }
 1051                 if (!(so->so_state & SS_ISCONNECTING)) {
 1052                         NG_MKMESSAGE(response, NGM_KSOCKET_COOKIE,
 1053                             NGM_KSOCKET_CONNECT, sizeof(int32_t), M_NOWAIT);
 1054                         if (response != NULL) {
 1055                                 response->header.flags |= NGF_RESP;
 1056                                 response->header.token = priv->response_token;
 1057                                 *(int32_t *)response->data = error;
 1058                                 /*
 1059                                  * send an async "response" message
 1060                                  * to the node that set us up
 1061                                  * (if it still exists)
 1062                                  */
 1063                                 NG_SEND_MSG_ID(error, node,
 1064                                     response, priv->response_addr, 0);
 1065                         }
 1066                         priv->flags &= ~KSF_CONNECTING;
 1067                 }
 1068         }
 1069 
 1070         /* Check whether a pending accept operation has completed */
 1071         if (priv->flags & KSF_ACCEPTING) {
 1072                 error = ng_ksocket_check_accept(priv);
 1073                 if (error != EWOULDBLOCK)
 1074                         priv->flags &= ~KSF_ACCEPTING;
 1075                 if (error == 0)
 1076                         ng_ksocket_finish_accept(priv);
 1077         }
 1078 
 1079         /*
 1080          * If we don't have a hook, we must handle data events later.  When
 1081          * the hook gets created and is connected, this upcall function
 1082          * will be called again.
 1083          */
 1084         if (priv->hook == NULL)
 1085                 return;
 1086 
 1087         /* Read and forward available mbufs. */
 1088         while (1) {
 1089                 struct uio uio;
 1090                 struct sockaddr *sa;
 1091                 struct mbuf *m;
 1092                 int flags;
 1093 
 1094                 /* Try to get next packet from socket. */
 1095                 uio.uio_td = NULL;
 1096                 uio.uio_resid = IP_MAXPACKET;
 1097                 flags = MSG_DONTWAIT;
 1098                 sa = NULL;
 1099                 if ((error = soreceive(so, (so->so_state & SS_ISCONNECTED) ?
 1100                     NULL : &sa, &uio, &m, NULL, &flags)) != 0)
 1101                         break;
 1102 
 1103                 /* See if we got anything. */
 1104                 if (flags & MSG_TRUNC) {
 1105                         m_freem(m);
 1106                         m = NULL;
 1107                 }
 1108                 if (m == NULL) {
 1109                         if (sa != NULL)
 1110                                 free(sa, M_SONAME);
 1111                         break;
 1112                 }
 1113 
 1114                 KASSERT(m->m_nextpkt == NULL, ("%s: nextpkt", __func__));
 1115 
 1116                 /*
 1117                  * Stream sockets do not have packet boundaries, so
 1118                  * we have to allocate a header mbuf and attach the
 1119                  * stream of data to it.
 1120                  */
 1121                 if (so->so_type == SOCK_STREAM) {
 1122                         struct mbuf *mh;
 1123 
 1124                         mh = m_gethdr(M_NOWAIT, MT_DATA);
 1125                         if (mh == NULL) {
 1126                                 m_freem(m);
 1127                                 if (sa != NULL)
 1128                                         free(sa, M_SONAME);
 1129                                 break;
 1130                         }
 1131 
 1132                         mh->m_next = m;
 1133                         for (; m; m = m->m_next)
 1134                                 mh->m_pkthdr.len += m->m_len;
 1135                         m = mh;
 1136                 }
 1137 
 1138                 /* Put peer's socket address (if any) into a tag */
 1139                 if (sa != NULL) {
 1140                         struct sa_tag   *stag;
 1141 
 1142                         stag = (struct sa_tag *)m_tag_alloc(NGM_KSOCKET_COOKIE,
 1143                             NG_KSOCKET_TAG_SOCKADDR, sizeof(ng_ID_t) +
 1144                             sa->sa_len, M_NOWAIT);
 1145                         if (stag == NULL) {
 1146                                 free(sa, M_SONAME);
 1147                                 goto sendit;
 1148                         }
 1149                         bcopy(sa, &stag->sa, sa->sa_len);
 1150                         free(sa, M_SONAME);
 1151                         stag->id = NG_NODE_ID(node);
 1152                         m_tag_prepend(m, &stag->tag);
 1153                 }
 1154 
 1155 sendit:         /* Forward data with optional peer sockaddr as packet tag */
 1156                 NG_SEND_DATA_ONLY(error, priv->hook, m);
 1157         }
 1158 
 1159         /*
 1160          * If the peer has closed the connection, forward a 0-length mbuf
 1161          * to indicate end-of-file.
 1162          */
 1163         if (so->so_rcv.sb_state & SBS_CANTRCVMORE &&
 1164             !(priv->flags & KSF_EOFSEEN)) {
 1165                 struct mbuf *m;
 1166 
 1167                 m = m_gethdr(M_NOWAIT, MT_DATA);
 1168                 if (m != NULL)
 1169                         NG_SEND_DATA_ONLY(error, priv->hook, m);
 1170                 priv->flags |= KSF_EOFSEEN;
 1171         }
 1172 }
 1173 
 1174 /*
 1175  * Check for a completed incoming connection and return 0 if one is found.
 1176  * Otherwise return the appropriate error code.
 1177  */
 1178 static int
 1179 ng_ksocket_check_accept(priv_p priv)
 1180 {
 1181         struct socket *const head = priv->so;
 1182         int error;
 1183 
 1184         if ((error = head->so_error) != 0) {
 1185                 head->so_error = 0;
 1186                 return error;
 1187         }
 1188         /* Unlocked read. */
 1189         if (TAILQ_EMPTY(&head->so_comp)) {
 1190                 if (head->so_rcv.sb_state & SBS_CANTRCVMORE)
 1191                         return ECONNABORTED;
 1192                 return EWOULDBLOCK;
 1193         }
 1194         return 0;
 1195 }
 1196 
 1197 /*
 1198  * Handle the first completed incoming connection, assumed to be already
 1199  * on the socket's so_comp queue.
 1200  */
 1201 static void
 1202 ng_ksocket_finish_accept(priv_p priv)
 1203 {
 1204         struct socket *const head = priv->so;
 1205         struct socket *so;
 1206         struct sockaddr *sa = NULL;
 1207         struct ng_mesg *resp;
 1208         struct ng_ksocket_accept *resp_data;
 1209         node_p node;
 1210         priv_p priv2;
 1211         int len;
 1212         int error;
 1213 
 1214         ACCEPT_LOCK();
 1215         so = TAILQ_FIRST(&head->so_comp);
 1216         if (so == NULL) {       /* Should never happen */
 1217                 ACCEPT_UNLOCK();
 1218                 return;
 1219         }
 1220         TAILQ_REMOVE(&head->so_comp, so, so_list);
 1221         head->so_qlen--;
 1222         so->so_qstate &= ~SQ_COMP;
 1223         so->so_head = NULL;
 1224         SOCK_LOCK(so);
 1225         soref(so);
 1226         so->so_state |= SS_NBIO;
 1227         SOCK_UNLOCK(so);
 1228         ACCEPT_UNLOCK();
 1229 
 1230         /* XXX KNOTE_UNLOCKED(&head->so_rcv.sb_sel.si_note, 0); */
 1231 
 1232         soaccept(so, &sa);
 1233 
 1234         len = OFFSETOF(struct ng_ksocket_accept, addr);
 1235         if (sa != NULL)
 1236                 len += sa->sa_len;
 1237 
 1238         NG_MKMESSAGE(resp, NGM_KSOCKET_COOKIE, NGM_KSOCKET_ACCEPT, len,
 1239             M_NOWAIT);
 1240         if (resp == NULL) {
 1241                 soclose(so);
 1242                 goto out;
 1243         }
 1244         resp->header.flags |= NGF_RESP;
 1245         resp->header.token = priv->response_token;
 1246 
 1247         /* Clone a ksocket node to wrap the new socket */
 1248         error = ng_make_node_common(&ng_ksocket_typestruct, &node);
 1249         if (error) {
 1250                 free(resp, M_NETGRAPH);
 1251                 soclose(so);
 1252                 goto out;
 1253         }
 1254 
 1255         if (ng_ksocket_constructor(node) != 0) {
 1256                 NG_NODE_UNREF(node);
 1257                 free(resp, M_NETGRAPH);
 1258                 soclose(so);
 1259                 goto out;
 1260         }
 1261 
 1262         priv2 = NG_NODE_PRIVATE(node);
 1263         priv2->so = so;
 1264         priv2->flags |= KSF_CLONED | KSF_EMBRYONIC;
 1265 
 1266         /*
 1267          * Insert the cloned node into a list of embryonic children
 1268          * on the parent node.  When a hook is created on the cloned
 1269          * node it will be removed from this list.  When the parent
 1270          * is destroyed it will destroy any embryonic children it has.
 1271          */
 1272         LIST_INSERT_HEAD(&priv->embryos, priv2, siblings);
 1273 
 1274         SOCKBUF_LOCK(&so->so_rcv);
 1275         soupcall_set(so, SO_RCV, ng_ksocket_incoming, node);
 1276         SOCKBUF_UNLOCK(&so->so_rcv);
 1277         SOCKBUF_LOCK(&so->so_snd);
 1278         soupcall_set(so, SO_SND, ng_ksocket_incoming, node);
 1279         SOCKBUF_UNLOCK(&so->so_snd);
 1280 
 1281         /* Fill in the response data and send it or return it to the caller */
 1282         resp_data = (struct ng_ksocket_accept *)resp->data;
 1283         resp_data->nodeid = NG_NODE_ID(node);
 1284         if (sa != NULL)
 1285                 bcopy(sa, &resp_data->addr, sa->sa_len);
 1286         NG_SEND_MSG_ID(error, node, resp, priv->response_addr, 0);
 1287 
 1288 out:
 1289         if (sa != NULL)
 1290                 free(sa, M_SONAME);
 1291 }
 1292 
 1293 /*
 1294  * Parse out either an integer value or an alias.
 1295  */
 1296 static int
 1297 ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
 1298         const char *s, int family)
 1299 {
 1300         int k, val;
 1301         char *eptr;
 1302 
 1303         /* Try aliases */
 1304         for (k = 0; aliases[k].name != NULL; k++) {
 1305                 if (strcmp(s, aliases[k].name) == 0
 1306                     && aliases[k].family == family)
 1307                         return aliases[k].value;
 1308         }
 1309 
 1310         /* Try parsing as a number */
 1311         val = (int)strtoul(s, &eptr, 10);
 1312         if (val < 0 || *eptr != '\0')
 1313                 return (-1);
 1314         return (val);
 1315 }
 1316 

Cache object: e696517395055ebbfdbb431e4f696df2


[ 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.