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/10.2/sys/netgraph/ng_ksocket.c 260226 2014-01-03 12:28:33Z glebius $
   41  * $Whistle: ng_ksocket.c,v 1.1 1999/11/16 20:04:40 archie Exp $
   42  */
   43 
   44 /*
   45  * Kernel socket node type.  This node type is basically a kernel-mode
   46  * version of a socket... kindof like the reverse of the socket node type.
   47  */
   48 
   49 #include <sys/param.h>
   50 #include <sys/systm.h>
   51 #include <sys/kernel.h>
   52 #include <sys/mbuf.h>
   53 #include <sys/proc.h>
   54 #include <sys/malloc.h>
   55 #include <sys/ctype.h>
   56 #include <sys/protosw.h>
   57 #include <sys/errno.h>
   58 #include <sys/socket.h>
   59 #include <sys/socketvar.h>
   60 #include <sys/uio.h>
   61 #include <sys/un.h>
   62 
   63 #include <netgraph/ng_message.h>
   64 #include <netgraph/netgraph.h>
   65 #include <netgraph/ng_parse.h>
   66 #include <netgraph/ng_ksocket.h>
   67 
   68 #include <netinet/in.h>
   69 #include <netinet/ip.h>
   70 #include <netatalk/at.h>
   71 
   72 #ifdef NG_SEPARATE_MALLOC
   73 static MALLOC_DEFINE(M_NETGRAPH_KSOCKET, "netgraph_ksock",
   74     "netgraph ksock node");
   75 #else
   76 #define M_NETGRAPH_KSOCKET M_NETGRAPH
   77 #endif
   78 
   79 #define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0))
   80 #define SADATA_OFFSET   (OFFSETOF(struct sockaddr, sa_data))
   81 
   82 /* Node private data */
   83 struct ng_ksocket_private {
   84         node_p          node;
   85         hook_p          hook;
   86         struct socket   *so;
   87         int             fn_sent;        /* FN call on incoming event was sent */
   88         LIST_HEAD(, ng_ksocket_private) embryos;
   89         LIST_ENTRY(ng_ksocket_private)  siblings;
   90         u_int32_t       flags;
   91         u_int32_t       response_token;
   92         ng_ID_t         response_addr;
   93 };
   94 typedef struct ng_ksocket_private *priv_p;
   95 
   96 /* Flags for priv_p */
   97 #define KSF_CONNECTING  0x00000001      /* Waiting for connection complete */
   98 #define KSF_ACCEPTING   0x00000002      /* Waiting for accept complete */
   99 #define KSF_EOFSEEN     0x00000004      /* Have sent 0-length EOF mbuf */
  100 #define KSF_CLONED      0x00000008      /* Cloned from an accepting socket */
  101 #define KSF_EMBRYONIC   0x00000010      /* Cloned node with no hooks yet */
  102 
  103 /* Netgraph node methods */
  104 static ng_constructor_t ng_ksocket_constructor;
  105 static ng_rcvmsg_t      ng_ksocket_rcvmsg;
  106 static ng_shutdown_t    ng_ksocket_shutdown;
  107 static ng_newhook_t     ng_ksocket_newhook;
  108 static ng_rcvdata_t     ng_ksocket_rcvdata;
  109 static ng_connect_t     ng_ksocket_connect;
  110 static ng_disconnect_t  ng_ksocket_disconnect;
  111 
  112 /* Alias structure */
  113 struct ng_ksocket_alias {
  114         const char      *name;
  115         const int       value;
  116         const int       family;
  117 };
  118 
  119 /* Protocol family aliases */
  120 static const struct ng_ksocket_alias ng_ksocket_families[] = {
  121         { "local",      PF_LOCAL        },
  122         { "inet",       PF_INET         },
  123         { "inet6",      PF_INET6        },
  124         { "atalk",      PF_APPLETALK    },
  125         { "ipx",        PF_IPX          },
  126         { "atm",        PF_ATM          },
  127         { NULL,         -1              },
  128 };
  129 
  130 /* Socket type aliases */
  131 static const struct ng_ksocket_alias ng_ksocket_types[] = {
  132         { "stream",     SOCK_STREAM     },
  133         { "dgram",      SOCK_DGRAM      },
  134         { "raw",        SOCK_RAW        },
  135         { "rdm",        SOCK_RDM        },
  136         { "seqpacket",  SOCK_SEQPACKET  },
  137         { NULL,         -1              },
  138 };
  139 
  140 /* Protocol aliases */
  141 static const struct ng_ksocket_alias ng_ksocket_protos[] = {
  142         { "ip",         IPPROTO_IP,             PF_INET         },
  143         { "raw",        IPPROTO_RAW,            PF_INET         },
  144         { "icmp",       IPPROTO_ICMP,           PF_INET         },
  145         { "igmp",       IPPROTO_IGMP,           PF_INET         },
  146         { "tcp",        IPPROTO_TCP,            PF_INET         },
  147         { "udp",        IPPROTO_UDP,            PF_INET         },
  148         { "gre",        IPPROTO_GRE,            PF_INET         },
  149         { "esp",        IPPROTO_ESP,            PF_INET         },
  150         { "ah",         IPPROTO_AH,             PF_INET         },
  151         { "swipe",      IPPROTO_SWIPE,          PF_INET         },
  152         { "encap",      IPPROTO_ENCAP,          PF_INET         },
  153         { "divert",     IPPROTO_DIVERT,         PF_INET         },
  154         { "pim",        IPPROTO_PIM,            PF_INET         },
  155         { "ddp",        ATPROTO_DDP,            PF_APPLETALK    },
  156         { "aarp",       ATPROTO_AARP,           PF_APPLETALK    },
  157         { NULL,         -1                                      },
  158 };
  159 
  160 /* Helper functions */
  161 static int      ng_ksocket_check_accept(priv_p);
  162 static void     ng_ksocket_finish_accept(priv_p);
  163 static int      ng_ksocket_incoming(struct socket *so, void *arg, int waitflag);
  164 static int      ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
  165                         const char *s, int family);
  166 static void     ng_ksocket_incoming2(node_p node, hook_p hook,
  167                         void *arg1, int arg2);
  168 
  169 /************************************************************************
  170                         STRUCT SOCKADDR PARSE TYPE
  171  ************************************************************************/
  172 
  173 /* Get the length of the data portion of a generic struct sockaddr */
  174 static int
  175 ng_parse_generic_sockdata_getLength(const struct ng_parse_type *type,
  176         const u_char *start, const u_char *buf)
  177 {
  178         const struct sockaddr *sa;
  179 
  180         sa = (const struct sockaddr *)(buf - SADATA_OFFSET);
  181         return (sa->sa_len < SADATA_OFFSET) ? 0 : sa->sa_len - SADATA_OFFSET;
  182 }
  183 
  184 /* Type for the variable length data portion of a generic struct sockaddr */
  185 static const struct ng_parse_type ng_ksocket_generic_sockdata_type = {
  186         &ng_parse_bytearray_type,
  187         &ng_parse_generic_sockdata_getLength
  188 };
  189 
  190 /* Type for a generic struct sockaddr */
  191 static const struct ng_parse_struct_field
  192     ng_parse_generic_sockaddr_type_fields[] = {
  193           { "len",      &ng_parse_uint8_type                    },
  194           { "family",   &ng_parse_uint8_type                    },
  195           { "data",     &ng_ksocket_generic_sockdata_type       },
  196           { NULL }
  197 };
  198 static const struct ng_parse_type ng_ksocket_generic_sockaddr_type = {
  199         &ng_parse_struct_type,
  200         &ng_parse_generic_sockaddr_type_fields
  201 };
  202 
  203 /* Convert a struct sockaddr from ASCII to binary.  If its a protocol
  204    family that we specially handle, do that, otherwise defer to the
  205    generic parse type ng_ksocket_generic_sockaddr_type. */
  206 static int
  207 ng_ksocket_sockaddr_parse(const struct ng_parse_type *type,
  208         const char *s, int *off, const u_char *const start,
  209         u_char *const buf, int *buflen)
  210 {
  211         struct sockaddr *const sa = (struct sockaddr *)buf;
  212         enum ng_parse_token tok;
  213         char fambuf[32];
  214         int family, len;
  215         char *t;
  216 
  217         /* If next token is a left curly brace, use generic parse type */
  218         if ((tok = ng_parse_get_token(s, off, &len)) == T_LBRACE) {
  219                 return (*ng_ksocket_generic_sockaddr_type.supertype->parse)
  220                     (&ng_ksocket_generic_sockaddr_type,
  221                     s, off, start, buf, buflen);
  222         }
  223 
  224         /* Get socket address family followed by a slash */
  225         while (isspace(s[*off]))
  226                 (*off)++;
  227         if ((t = strchr(s + *off, '/')) == NULL)
  228                 return (EINVAL);
  229         if ((len = t - (s + *off)) > sizeof(fambuf) - 1)
  230                 return (EINVAL);
  231         strncpy(fambuf, s + *off, len);
  232         fambuf[len] = '\0';
  233         *off += len + 1;
  234         if ((family = ng_ksocket_parse(ng_ksocket_families, fambuf, 0)) == -1)
  235                 return (EINVAL);
  236 
  237         /* Set family */
  238         if (*buflen < SADATA_OFFSET)
  239                 return (ERANGE);
  240         sa->sa_family = family;
  241 
  242         /* Set family-specific data and length */
  243         switch (sa->sa_family) {
  244         case PF_LOCAL:          /* Get pathname */
  245             {
  246                 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
  247                 struct sockaddr_un *const sun = (struct sockaddr_un *)sa;
  248                 int toklen, pathlen;
  249                 char *path;
  250 
  251                 if ((path = ng_get_string_token(s, off, &toklen, NULL)) == NULL)
  252                         return (EINVAL);
  253                 pathlen = strlen(path);
  254                 if (pathlen > SOCK_MAXADDRLEN) {
  255                         free(path, M_NETGRAPH_KSOCKET);
  256                         return (E2BIG);
  257                 }
  258                 if (*buflen < pathoff + pathlen) {
  259                         free(path, M_NETGRAPH_KSOCKET);
  260                         return (ERANGE);
  261                 }
  262                 *off += toklen;
  263                 bcopy(path, sun->sun_path, pathlen);
  264                 sun->sun_len = pathoff + pathlen;
  265                 free(path, M_NETGRAPH_KSOCKET);
  266                 break;
  267             }
  268 
  269         case PF_INET:           /* Get an IP address with optional port */
  270             {
  271                 struct sockaddr_in *const sin = (struct sockaddr_in *)sa;
  272                 int i;
  273 
  274                 /* Parse this: <ipaddress>[:port] */
  275                 for (i = 0; i < 4; i++) {
  276                         u_long val;
  277                         char *eptr;
  278 
  279                         val = strtoul(s + *off, &eptr, 10);
  280                         if (val > 0xff || eptr == s + *off)
  281                                 return (EINVAL);
  282                         *off += (eptr - (s + *off));
  283                         ((u_char *)&sin->sin_addr)[i] = (u_char)val;
  284                         if (i < 3) {
  285                                 if (s[*off] != '.')
  286                                         return (EINVAL);
  287                                 (*off)++;
  288                         } else if (s[*off] == ':') {
  289                                 (*off)++;
  290                                 val = strtoul(s + *off, &eptr, 10);
  291                                 if (val > 0xffff || eptr == s + *off)
  292                                         return (EINVAL);
  293                                 *off += (eptr - (s + *off));
  294                                 sin->sin_port = htons(val);
  295                         } else
  296                                 sin->sin_port = 0;
  297                 }
  298                 bzero(&sin->sin_zero, sizeof(sin->sin_zero));
  299                 sin->sin_len = sizeof(*sin);
  300                 break;
  301             }
  302 
  303 #if 0
  304         case PF_APPLETALK:      /* XXX implement these someday */
  305         case PF_INET6:
  306         case PF_IPX:
  307 #endif
  308 
  309         default:
  310                 return (EINVAL);
  311         }
  312 
  313         /* Done */
  314         *buflen = sa->sa_len;
  315         return (0);
  316 }
  317 
  318 /* Convert a struct sockaddr from binary to ASCII */
  319 static int
  320 ng_ksocket_sockaddr_unparse(const struct ng_parse_type *type,
  321         const u_char *data, int *off, char *cbuf, int cbuflen)
  322 {
  323         const struct sockaddr *sa = (const struct sockaddr *)(data + *off);
  324         int slen = 0;
  325 
  326         /* Output socket address, either in special or generic format */
  327         switch (sa->sa_family) {
  328         case PF_LOCAL:
  329             {
  330                 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
  331                 const struct sockaddr_un *sun = (const struct sockaddr_un *)sa;
  332                 const int pathlen = sun->sun_len - pathoff;
  333                 char pathbuf[SOCK_MAXADDRLEN + 1];
  334                 char *pathtoken;
  335 
  336                 bcopy(sun->sun_path, pathbuf, pathlen);
  337                 if ((pathtoken = ng_encode_string(pathbuf, pathlen)) == NULL)
  338                         return (ENOMEM);
  339                 slen += snprintf(cbuf, cbuflen, "local/%s", pathtoken);
  340                 free(pathtoken, M_NETGRAPH_KSOCKET);
  341                 if (slen >= cbuflen)
  342                         return (ERANGE);
  343                 *off += sun->sun_len;
  344                 return (0);
  345             }
  346 
  347         case PF_INET:
  348             {
  349                 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
  350 
  351                 slen += snprintf(cbuf, cbuflen, "inet/%d.%d.%d.%d",
  352                   ((const u_char *)&sin->sin_addr)[0],
  353                   ((const u_char *)&sin->sin_addr)[1],
  354                   ((const u_char *)&sin->sin_addr)[2],
  355                   ((const u_char *)&sin->sin_addr)[3]);
  356                 if (sin->sin_port != 0) {
  357                         slen += snprintf(cbuf + strlen(cbuf),
  358                             cbuflen - strlen(cbuf), ":%d",
  359                             (u_int)ntohs(sin->sin_port));
  360                 }
  361                 if (slen >= cbuflen)
  362                         return (ERANGE);
  363                 *off += sizeof(*sin);
  364                 return(0);
  365             }
  366 
  367 #if 0
  368         case PF_APPLETALK:      /* XXX implement these someday */
  369         case PF_INET6:
  370         case PF_IPX:
  371 #endif
  372 
  373         default:
  374                 return (*ng_ksocket_generic_sockaddr_type.supertype->unparse)
  375                     (&ng_ksocket_generic_sockaddr_type,
  376                     data, off, cbuf, cbuflen);
  377         }
  378 }
  379 
  380 /* Parse type for struct sockaddr */
  381 static const struct ng_parse_type ng_ksocket_sockaddr_type = {
  382         NULL,
  383         NULL,
  384         NULL,
  385         &ng_ksocket_sockaddr_parse,
  386         &ng_ksocket_sockaddr_unparse,
  387         NULL            /* no such thing as a default struct sockaddr */
  388 };
  389 
  390 /************************************************************************
  391                 STRUCT NG_KSOCKET_SOCKOPT PARSE TYPE
  392  ************************************************************************/
  393 
  394 /* Get length of the struct ng_ksocket_sockopt value field, which is the
  395    just the excess of the message argument portion over the length of
  396    the struct ng_ksocket_sockopt. */
  397 static int
  398 ng_parse_sockoptval_getLength(const struct ng_parse_type *type,
  399         const u_char *start, const u_char *buf)
  400 {
  401         static const int offset = OFFSETOF(struct ng_ksocket_sockopt, value);
  402         const struct ng_ksocket_sockopt *sopt;
  403         const struct ng_mesg *msg;
  404 
  405         sopt = (const struct ng_ksocket_sockopt *)(buf - offset);
  406         msg = (const struct ng_mesg *)((const u_char *)sopt - sizeof(*msg));
  407         return msg->header.arglen - sizeof(*sopt);
  408 }
  409 
  410 /* Parse type for the option value part of a struct ng_ksocket_sockopt
  411    XXX Eventually, we should handle the different socket options specially.
  412    XXX This would avoid byte order problems, eg an integer value of 1 is
  413    XXX going to be "[1]" for little endian or "[3=1]" for big endian. */
  414 static const struct ng_parse_type ng_ksocket_sockoptval_type = {
  415         &ng_parse_bytearray_type,
  416         &ng_parse_sockoptval_getLength
  417 };
  418 
  419 /* Parse type for struct ng_ksocket_sockopt */
  420 static const struct ng_parse_struct_field ng_ksocket_sockopt_type_fields[]
  421         = NG_KSOCKET_SOCKOPT_INFO(&ng_ksocket_sockoptval_type);
  422 static const struct ng_parse_type ng_ksocket_sockopt_type = {
  423         &ng_parse_struct_type,
  424         &ng_ksocket_sockopt_type_fields
  425 };
  426 
  427 /* Parse type for struct ng_ksocket_accept */
  428 static const struct ng_parse_struct_field ng_ksocket_accept_type_fields[]
  429         = NGM_KSOCKET_ACCEPT_INFO;
  430 static const struct ng_parse_type ng_ksocket_accept_type = {
  431         &ng_parse_struct_type,
  432         &ng_ksocket_accept_type_fields
  433 };
  434 
  435 /* List of commands and how to convert arguments to/from ASCII */
  436 static const struct ng_cmdlist ng_ksocket_cmds[] = {
  437         {
  438           NGM_KSOCKET_COOKIE,
  439           NGM_KSOCKET_BIND,
  440           "bind",
  441           &ng_ksocket_sockaddr_type,
  442           NULL
  443         },
  444         {
  445           NGM_KSOCKET_COOKIE,
  446           NGM_KSOCKET_LISTEN,
  447           "listen",
  448           &ng_parse_int32_type,
  449           NULL
  450         },
  451         {
  452           NGM_KSOCKET_COOKIE,
  453           NGM_KSOCKET_ACCEPT,
  454           "accept",
  455           NULL,
  456           &ng_ksocket_accept_type
  457         },
  458         {
  459           NGM_KSOCKET_COOKIE,
  460           NGM_KSOCKET_CONNECT,
  461           "connect",
  462           &ng_ksocket_sockaddr_type,
  463           &ng_parse_int32_type
  464         },
  465         {
  466           NGM_KSOCKET_COOKIE,
  467           NGM_KSOCKET_GETNAME,
  468           "getname",
  469           NULL,
  470           &ng_ksocket_sockaddr_type
  471         },
  472         {
  473           NGM_KSOCKET_COOKIE,
  474           NGM_KSOCKET_GETPEERNAME,
  475           "getpeername",
  476           NULL,
  477           &ng_ksocket_sockaddr_type
  478         },
  479         {
  480           NGM_KSOCKET_COOKIE,
  481           NGM_KSOCKET_SETOPT,
  482           "setopt",
  483           &ng_ksocket_sockopt_type,
  484           NULL
  485         },
  486         {
  487           NGM_KSOCKET_COOKIE,
  488           NGM_KSOCKET_GETOPT,
  489           "getopt",
  490           &ng_ksocket_sockopt_type,
  491           &ng_ksocket_sockopt_type
  492         },
  493         { 0 }
  494 };
  495 
  496 /* Node type descriptor */
  497 static struct ng_type ng_ksocket_typestruct = {
  498         .version =      NG_ABI_VERSION,
  499         .name =         NG_KSOCKET_NODE_TYPE,
  500         .constructor =  ng_ksocket_constructor,
  501         .rcvmsg =       ng_ksocket_rcvmsg,
  502         .shutdown =     ng_ksocket_shutdown,
  503         .newhook =      ng_ksocket_newhook,
  504         .connect =      ng_ksocket_connect,
  505         .rcvdata =      ng_ksocket_rcvdata,
  506         .disconnect =   ng_ksocket_disconnect,
  507         .cmdlist =      ng_ksocket_cmds,
  508 };
  509 NETGRAPH_INIT(ksocket, &ng_ksocket_typestruct);
  510 
  511 #define ERROUT(x)       do { error = (x); goto done; } while (0)
  512 
  513 /************************************************************************
  514                         NETGRAPH NODE STUFF
  515  ************************************************************************/
  516 
  517 /*
  518  * Node type constructor
  519  * The NODE part is assumed to be all set up.
  520  * There is already a reference to the node for us.
  521  */
  522 static int
  523 ng_ksocket_constructor(node_p node)
  524 {
  525         priv_p priv;
  526 
  527         /* Allocate private structure */
  528         priv = malloc(sizeof(*priv), M_NETGRAPH_KSOCKET, M_NOWAIT | M_ZERO);
  529         if (priv == NULL)
  530                 return (ENOMEM);
  531 
  532         LIST_INIT(&priv->embryos);
  533         /* cross link them */
  534         priv->node = node;
  535         NG_NODE_SET_PRIVATE(node, priv);
  536 
  537         /* Done */
  538         return (0);
  539 }
  540 
  541 /*
  542  * Give our OK for a hook to be added. The hook name is of the
  543  * form "<family>/<type>/<proto>" where the three components may
  544  * be decimal numbers or else aliases from the above lists.
  545  *
  546  * Connecting a hook amounts to opening the socket.  Disconnecting
  547  * the hook closes the socket and destroys the node as well.
  548  */
  549 static int
  550 ng_ksocket_newhook(node_p node, hook_p hook, const char *name0)
  551 {
  552         struct thread *td = curthread;  /* XXX broken */
  553         const priv_p priv = NG_NODE_PRIVATE(node);
  554         char *s1, *s2, name[NG_HOOKSIZ];
  555         int family, type, protocol, error;
  556 
  557         /* Check if we're already connected */
  558         if (priv->hook != NULL)
  559                 return (EISCONN);
  560 
  561         if (priv->flags & KSF_CLONED) {
  562                 if (priv->flags & KSF_EMBRYONIC) {
  563                         /* Remove ourselves from our parent's embryo list */
  564                         LIST_REMOVE(priv, siblings);
  565                         priv->flags &= ~KSF_EMBRYONIC;
  566                 }
  567         } else {
  568                 /* Extract family, type, and protocol from hook name */
  569                 snprintf(name, sizeof(name), "%s", name0);
  570                 s1 = name;
  571                 if ((s2 = strchr(s1, '/')) == NULL)
  572                         return (EINVAL);
  573                 *s2++ = '\0';
  574                 family = ng_ksocket_parse(ng_ksocket_families, s1, 0);
  575                 if (family == -1)
  576                         return (EINVAL);
  577                 s1 = s2;
  578                 if ((s2 = strchr(s1, '/')) == NULL)
  579                         return (EINVAL);
  580                 *s2++ = '\0';
  581                 type = ng_ksocket_parse(ng_ksocket_types, s1, 0);
  582                 if (type == -1)
  583                         return (EINVAL);
  584                 s1 = s2;
  585                 protocol = ng_ksocket_parse(ng_ksocket_protos, s1, family);
  586                 if (protocol == -1)
  587                         return (EINVAL);
  588 
  589                 /* Create the socket */
  590                 error = socreate(family, &priv->so, type, protocol,
  591                    td->td_ucred, td);
  592                 if (error != 0)
  593                         return (error);
  594 
  595                 /* XXX call soreserve() ? */
  596 
  597         }
  598 
  599         /* OK */
  600         priv->hook = hook;
  601 
  602         /*
  603          * In case of misconfigured routing a packet may reenter
  604          * ksocket node recursively. Decouple stack to avoid possible
  605          * panics about sleeping with locks held.
  606          */
  607         NG_HOOK_FORCE_QUEUE(hook);
  608 
  609         return(0);
  610 }
  611 
  612 static int
  613 ng_ksocket_connect(hook_p hook)
  614 {
  615         node_p node = NG_HOOK_NODE(hook);
  616         const priv_p priv = NG_NODE_PRIVATE(node);
  617         struct socket *const so = priv->so;
  618 
  619         /* Add our hook for incoming data and other events */
  620         SOCKBUF_LOCK(&priv->so->so_rcv);
  621         soupcall_set(priv->so, SO_RCV, ng_ksocket_incoming, node);
  622         SOCKBUF_UNLOCK(&priv->so->so_rcv);
  623         SOCKBUF_LOCK(&priv->so->so_snd);
  624         soupcall_set(priv->so, SO_SND, ng_ksocket_incoming, node);
  625         SOCKBUF_UNLOCK(&priv->so->so_snd);
  626         SOCK_LOCK(priv->so);
  627         priv->so->so_state |= SS_NBIO;
  628         SOCK_UNLOCK(priv->so);
  629         /*
  630          * --Original comment--
  631          * On a cloned socket we may have already received one or more
  632          * upcalls which we couldn't handle without a hook.  Handle
  633          * those now.
  634          * We cannot call the upcall function directly
  635          * from here, because until this function has returned our
  636          * hook isn't connected.
  637          *
  638          * ---meta comment for -current ---
  639          * XXX This is dubius.
  640          * Upcalls between the time that the hook was
  641          * first created and now (on another processesor) will
  642          * be earlier on the queue than the request to finalise the hook.
  643          * By the time the hook is finalised,
  644          * The queued upcalls will have happenned and the code
  645          * will have discarded them because of a lack of a hook.
  646          * (socket not open).
  647          *
  648          * This is a bad byproduct of the complicated way in which hooks
  649          * are now created (3 daisy chained async events).
  650          *
  651          * Since we are a netgraph operation
  652          * We know that we hold a lock on this node. This forces the
  653          * request we make below to be queued rather than implemented
  654          * immediatly which will cause the upcall function to be called a bit
  655          * later.
  656          * However, as we will run any waiting queued operations immediatly
  657          * after doing this one, if we have not finalised the other end
  658          * of the hook, those queued operations will fail.
  659          */
  660         if (priv->flags & KSF_CLONED) {
  661                 ng_send_fn(node, NULL, &ng_ksocket_incoming2, so, M_NOWAIT);
  662         }
  663 
  664         return (0);
  665 }
  666 
  667 /*
  668  * Receive a control message
  669  */
  670 static int
  671 ng_ksocket_rcvmsg(node_p node, item_p item, hook_p lasthook)
  672 {
  673         struct thread *td = curthread;  /* XXX broken */
  674         const priv_p priv = NG_NODE_PRIVATE(node);
  675         struct socket *const so = priv->so;
  676         struct ng_mesg *resp = NULL;
  677         int error = 0;
  678         struct ng_mesg *msg;
  679         ng_ID_t raddr;
  680 
  681         NGI_GET_MSG(item, msg);
  682         switch (msg->header.typecookie) {
  683         case NGM_KSOCKET_COOKIE:
  684                 switch (msg->header.cmd) {
  685                 case NGM_KSOCKET_BIND:
  686                     {
  687                         struct sockaddr *const sa
  688                             = (struct sockaddr *)msg->data;
  689 
  690                         /* Sanity check */
  691                         if (msg->header.arglen < SADATA_OFFSET
  692                             || msg->header.arglen < sa->sa_len)
  693                                 ERROUT(EINVAL);
  694                         if (so == NULL)
  695                                 ERROUT(ENXIO);
  696 
  697                         /* Bind */
  698                         error = sobind(so, sa, td);
  699                         break;
  700                     }
  701                 case NGM_KSOCKET_LISTEN:
  702                     {
  703                         /* Sanity check */
  704                         if (msg->header.arglen != sizeof(int32_t))
  705                                 ERROUT(EINVAL);
  706                         if (so == NULL)
  707                                 ERROUT(ENXIO);
  708 
  709                         /* Listen */
  710                         error = solisten(so, *((int32_t *)msg->data), td);
  711                         break;
  712                     }
  713 
  714                 case NGM_KSOCKET_ACCEPT:
  715                     {
  716                         /* Sanity check */
  717                         if (msg->header.arglen != 0)
  718                                 ERROUT(EINVAL);
  719                         if (so == NULL)
  720                                 ERROUT(ENXIO);
  721 
  722                         /* Make sure the socket is capable of accepting */
  723                         if (!(so->so_options & SO_ACCEPTCONN))
  724                                 ERROUT(EINVAL);
  725                         if (priv->flags & KSF_ACCEPTING)
  726                                 ERROUT(EALREADY);
  727 
  728                         error = ng_ksocket_check_accept(priv);
  729                         if (error != 0 && error != EWOULDBLOCK)
  730                                 ERROUT(error);
  731 
  732                         /*
  733                          * If a connection is already complete, take it.
  734                          * Otherwise let the upcall function deal with
  735                          * the connection when it comes in.
  736                          */
  737                         priv->response_token = msg->header.token;
  738                         raddr = priv->response_addr = NGI_RETADDR(item);
  739                         if (error == 0) {
  740                                 ng_ksocket_finish_accept(priv);
  741                         } else
  742                                 priv->flags |= KSF_ACCEPTING;
  743                         break;
  744                     }
  745 
  746                 case NGM_KSOCKET_CONNECT:
  747                     {
  748                         struct sockaddr *const sa
  749                             = (struct sockaddr *)msg->data;
  750 
  751                         /* Sanity check */
  752                         if (msg->header.arglen < SADATA_OFFSET
  753                             || msg->header.arglen < sa->sa_len)
  754                                 ERROUT(EINVAL);
  755                         if (so == NULL)
  756                                 ERROUT(ENXIO);
  757 
  758                         /* Do connect */
  759                         if ((so->so_state & SS_ISCONNECTING) != 0)
  760                                 ERROUT(EALREADY);
  761                         if ((error = soconnect(so, sa, td)) != 0) {
  762                                 so->so_state &= ~SS_ISCONNECTING;
  763                                 ERROUT(error);
  764                         }
  765                         if ((so->so_state & SS_ISCONNECTING) != 0) {
  766                                 /* We will notify the sender when we connect */
  767                                 priv->response_token = msg->header.token;
  768                                 raddr = priv->response_addr = NGI_RETADDR(item);
  769                                 priv->flags |= KSF_CONNECTING;
  770                                 ERROUT(EINPROGRESS);
  771                         }
  772                         break;
  773                     }
  774 
  775                 case NGM_KSOCKET_GETNAME:
  776                 case NGM_KSOCKET_GETPEERNAME:
  777                     {
  778                         int (*func)(struct socket *so, struct sockaddr **nam);
  779                         struct sockaddr *sa = NULL;
  780                         int len;
  781 
  782                         /* Sanity check */
  783                         if (msg->header.arglen != 0)
  784                                 ERROUT(EINVAL);
  785                         if (so == NULL)
  786                                 ERROUT(ENXIO);
  787 
  788                         /* Get function */
  789                         if (msg->header.cmd == NGM_KSOCKET_GETPEERNAME) {
  790                                 if ((so->so_state
  791                                     & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0)
  792                                         ERROUT(ENOTCONN);
  793                                 func = so->so_proto->pr_usrreqs->pru_peeraddr;
  794                         } else
  795                                 func = so->so_proto->pr_usrreqs->pru_sockaddr;
  796 
  797                         /* Get local or peer address */
  798                         if ((error = (*func)(so, &sa)) != 0)
  799                                 goto bail;
  800                         len = (sa == NULL) ? 0 : sa->sa_len;
  801 
  802                         /* Send it back in a response */
  803                         NG_MKRESPONSE(resp, msg, len, M_NOWAIT);
  804                         if (resp == NULL) {
  805                                 error = ENOMEM;
  806                                 goto bail;
  807                         }
  808                         bcopy(sa, resp->data, len);
  809 
  810                 bail:
  811                         /* Cleanup */
  812                         if (sa != NULL)
  813                                 free(sa, M_SONAME);
  814                         break;
  815                     }
  816 
  817                 case NGM_KSOCKET_GETOPT:
  818                     {
  819                         struct ng_ksocket_sockopt *ksopt =
  820                             (struct ng_ksocket_sockopt *)msg->data;
  821                         struct sockopt sopt;
  822 
  823                         /* Sanity check */
  824                         if (msg->header.arglen != sizeof(*ksopt))
  825                                 ERROUT(EINVAL);
  826                         if (so == NULL)
  827                                 ERROUT(ENXIO);
  828 
  829                         /* Get response with room for option value */
  830                         NG_MKRESPONSE(resp, msg, sizeof(*ksopt)
  831                             + NG_KSOCKET_MAX_OPTLEN, M_NOWAIT);
  832                         if (resp == NULL)
  833                                 ERROUT(ENOMEM);
  834 
  835                         /* Get socket option, and put value in the response */
  836                         sopt.sopt_dir = SOPT_GET;
  837                         sopt.sopt_level = ksopt->level;
  838                         sopt.sopt_name = ksopt->name;
  839                         sopt.sopt_td = NULL;
  840                         sopt.sopt_valsize = NG_KSOCKET_MAX_OPTLEN;
  841                         ksopt = (struct ng_ksocket_sockopt *)resp->data;
  842                         sopt.sopt_val = ksopt->value;
  843                         if ((error = sogetopt(so, &sopt)) != 0) {
  844                                 NG_FREE_MSG(resp);
  845                                 break;
  846                         }
  847 
  848                         /* Set actual value length */
  849                         resp->header.arglen = sizeof(*ksopt)
  850                             + sopt.sopt_valsize;
  851                         break;
  852                     }
  853 
  854                 case NGM_KSOCKET_SETOPT:
  855                     {
  856                         struct ng_ksocket_sockopt *const ksopt =
  857                             (struct ng_ksocket_sockopt *)msg->data;
  858                         const int valsize = msg->header.arglen - sizeof(*ksopt);
  859                         struct sockopt sopt;
  860 
  861                         /* Sanity check */
  862                         if (valsize < 0)
  863                                 ERROUT(EINVAL);
  864                         if (so == NULL)
  865                                 ERROUT(ENXIO);
  866 
  867                         /* Set socket option */
  868                         sopt.sopt_dir = SOPT_SET;
  869                         sopt.sopt_level = ksopt->level;
  870                         sopt.sopt_name = ksopt->name;
  871                         sopt.sopt_val = ksopt->value;
  872                         sopt.sopt_valsize = valsize;
  873                         sopt.sopt_td = NULL;
  874                         error = sosetopt(so, &sopt);
  875                         break;
  876                     }
  877 
  878                 default:
  879                         error = EINVAL;
  880                         break;
  881                 }
  882                 break;
  883         default:
  884                 error = EINVAL;
  885                 break;
  886         }
  887 done:
  888         NG_RESPOND_MSG(error, node, item, resp);
  889         NG_FREE_MSG(msg);
  890         return (error);
  891 }
  892 
  893 /*
  894  * Receive incoming data on our hook.  Send it out the socket.
  895  */
  896 static int
  897 ng_ksocket_rcvdata(hook_p hook, item_p item)
  898 {
  899         struct thread *td = curthread;  /* XXX broken */
  900         const node_p node = NG_HOOK_NODE(hook);
  901         const priv_p priv = NG_NODE_PRIVATE(node);
  902         struct socket *const so = priv->so;
  903         struct sockaddr *sa = NULL;
  904         int error;
  905         struct mbuf *m;
  906 #ifdef ALIGNED_POINTER
  907         struct mbuf *n;
  908 #endif /* ALIGNED_POINTER */
  909         struct sa_tag *stag;
  910 
  911         /* Extract data */
  912         NGI_GET_M(item, m);
  913         NG_FREE_ITEM(item);
  914 #ifdef ALIGNED_POINTER
  915         if (!ALIGNED_POINTER(mtod(m, caddr_t), uint32_t)) {
  916                 n = m_defrag(m, M_NOWAIT);
  917                 if (n == NULL) {
  918                         m_freem(m);
  919                         return (ENOBUFS);
  920                 }
  921                 m = n;
  922         }
  923 #endif /* ALIGNED_POINTER */
  924         /*
  925          * Look if socket address is stored in packet tags.
  926          * If sockaddr is ours, or provided by a third party (zero id),
  927          * then we accept it.
  928          */
  929         if (((stag = (struct sa_tag *)m_tag_locate(m, NGM_KSOCKET_COOKIE,
  930             NG_KSOCKET_TAG_SOCKADDR, NULL)) != NULL) &&
  931             (stag->id == NG_NODE_ID(node) || stag->id == 0))
  932                 sa = &stag->sa;
  933 
  934         /* Reset specific mbuf flags to prevent addressing problems. */
  935         m->m_flags &= ~(M_BCAST|M_MCAST);
  936 
  937         /* Send packet */
  938         error = sosend(so, sa, 0, m, 0, 0, td);
  939 
  940         return (error);
  941 }
  942 
  943 /*
  944  * Destroy node
  945  */
  946 static int
  947 ng_ksocket_shutdown(node_p node)
  948 {
  949         const priv_p priv = NG_NODE_PRIVATE(node);
  950         priv_p embryo;
  951 
  952         /* Close our socket (if any) */
  953         if (priv->so != NULL) {
  954                 SOCKBUF_LOCK(&priv->so->so_rcv);
  955                 soupcall_clear(priv->so, SO_RCV);
  956                 SOCKBUF_UNLOCK(&priv->so->so_rcv);
  957                 SOCKBUF_LOCK(&priv->so->so_snd);
  958                 soupcall_clear(priv->so, SO_SND);
  959                 SOCKBUF_UNLOCK(&priv->so->so_snd);
  960                 soclose(priv->so);
  961                 priv->so = NULL;
  962         }
  963 
  964         /* If we are an embryo, take ourselves out of the parent's list */
  965         if (priv->flags & KSF_EMBRYONIC) {
  966                 LIST_REMOVE(priv, siblings);
  967                 priv->flags &= ~KSF_EMBRYONIC;
  968         }
  969 
  970         /* Remove any embryonic children we have */
  971         while (!LIST_EMPTY(&priv->embryos)) {
  972                 embryo = LIST_FIRST(&priv->embryos);
  973                 ng_rmnode_self(embryo->node);
  974         }
  975 
  976         /* Take down netgraph node */
  977         bzero(priv, sizeof(*priv));
  978         free(priv, M_NETGRAPH_KSOCKET);
  979         NG_NODE_SET_PRIVATE(node, NULL);
  980         NG_NODE_UNREF(node);            /* let the node escape */
  981         return (0);
  982 }
  983 
  984 /*
  985  * Hook disconnection
  986  */
  987 static int
  988 ng_ksocket_disconnect(hook_p hook)
  989 {
  990         KASSERT(NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0,
  991             ("%s: numhooks=%d?", __func__,
  992             NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook))));
  993         if (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))
  994                 ng_rmnode_self(NG_HOOK_NODE(hook));
  995         return (0);
  996 }
  997 
  998 /************************************************************************
  999                         HELPER STUFF
 1000  ************************************************************************/
 1001 /*
 1002  * You should not "just call" a netgraph node function from an external
 1003  * asynchronous event. This is because in doing so you are ignoring the
 1004  * locking on the netgraph nodes. Instead call your function via ng_send_fn().
 1005  * This will call the function you chose, but will first do all the
 1006  * locking rigmarole. Your function MAY only be called at some distant future
 1007  * time (several millisecs away) so don't give it any arguments
 1008  * that may be revoked soon (e.g. on your stack).
 1009  *
 1010  * To decouple stack, we use queue version of ng_send_fn().
 1011  */
 1012 
 1013 static int
 1014 ng_ksocket_incoming(struct socket *so, void *arg, int waitflag)
 1015 {
 1016         const node_p node = arg;
 1017         const priv_p priv = NG_NODE_PRIVATE(node);
 1018         int wait = ((waitflag & M_WAITOK) ? NG_WAITOK : 0) | NG_QUEUE;
 1019 
 1020         /*
 1021          * Even if node is not locked, as soon as we are called, we assume
 1022          * it exist and it's private area is valid. With some care we can
 1023          * access it. Mark node that incoming event for it was sent to
 1024          * avoid unneded queue trashing.
 1025          */
 1026         if (atomic_cmpset_int(&priv->fn_sent, 0, 1) &&
 1027             ng_send_fn1(node, NULL, &ng_ksocket_incoming2, so, 0, wait)) {
 1028                 atomic_store_rel_int(&priv->fn_sent, 0);
 1029         }
 1030         return (SU_OK);
 1031 }
 1032 
 1033 
 1034 /*
 1035  * When incoming data is appended to the socket, we get notified here.
 1036  * This is also called whenever a significant event occurs for the socket.
 1037  * Our original caller may have queued this even some time ago and
 1038  * we cannot trust that he even still exists. The node however is being
 1039  * held with a reference by the queueing code and guarantied to be valid.
 1040  */
 1041 static void
 1042 ng_ksocket_incoming2(node_p node, hook_p hook, void *arg1, int arg2)
 1043 {
 1044         struct socket *so = arg1;
 1045         const priv_p priv = NG_NODE_PRIVATE(node);
 1046         struct ng_mesg *response;
 1047         int error;
 1048 
 1049         KASSERT(so == priv->so, ("%s: wrong socket", __func__));
 1050 
 1051         /* Allow next incoming event to be queued. */
 1052         atomic_store_rel_int(&priv->fn_sent, 0);
 1053 
 1054         /* Check whether a pending connect operation has completed */
 1055         if (priv->flags & KSF_CONNECTING) {
 1056                 if ((error = so->so_error) != 0) {
 1057                         so->so_error = 0;
 1058                         so->so_state &= ~SS_ISCONNECTING;
 1059                 }
 1060                 if (!(so->so_state & SS_ISCONNECTING)) {
 1061                         NG_MKMESSAGE(response, NGM_KSOCKET_COOKIE,
 1062                             NGM_KSOCKET_CONNECT, sizeof(int32_t), M_NOWAIT);
 1063                         if (response != NULL) {
 1064                                 response->header.flags |= NGF_RESP;
 1065                                 response->header.token = priv->response_token;
 1066                                 *(int32_t *)response->data = error;
 1067                                 /*
 1068                                  * send an async "response" message
 1069                                  * to the node that set us up
 1070                                  * (if it still exists)
 1071                                  */
 1072                                 NG_SEND_MSG_ID(error, node,
 1073                                     response, priv->response_addr, 0);
 1074                         }
 1075                         priv->flags &= ~KSF_CONNECTING;
 1076                 }
 1077         }
 1078 
 1079         /* Check whether a pending accept operation has completed */
 1080         if (priv->flags & KSF_ACCEPTING) {
 1081                 error = ng_ksocket_check_accept(priv);
 1082                 if (error != EWOULDBLOCK)
 1083                         priv->flags &= ~KSF_ACCEPTING;
 1084                 if (error == 0)
 1085                         ng_ksocket_finish_accept(priv);
 1086         }
 1087 
 1088         /*
 1089          * If we don't have a hook, we must handle data events later.  When
 1090          * the hook gets created and is connected, this upcall function
 1091          * will be called again.
 1092          */
 1093         if (priv->hook == NULL)
 1094                 return;
 1095 
 1096         /* Read and forward available mbufs. */
 1097         while (1) {
 1098                 struct uio uio;
 1099                 struct sockaddr *sa;
 1100                 struct mbuf *m;
 1101                 int flags;
 1102 
 1103                 /* Try to get next packet from socket. */
 1104                 uio.uio_td = NULL;
 1105                 uio.uio_resid = IP_MAXPACKET;
 1106                 flags = MSG_DONTWAIT;
 1107                 sa = NULL;
 1108                 if ((error = soreceive(so, (so->so_state & SS_ISCONNECTED) ?
 1109                     NULL : &sa, &uio, &m, NULL, &flags)) != 0)
 1110                         break;
 1111 
 1112                 /* See if we got anything. */
 1113                 if (flags & MSG_TRUNC) {
 1114                         m_freem(m);
 1115                         m = NULL;
 1116                 }
 1117                 if (m == NULL) {
 1118                         if (sa != NULL)
 1119                                 free(sa, M_SONAME);
 1120                         break;
 1121                 }
 1122 
 1123                 KASSERT(m->m_nextpkt == NULL, ("%s: nextpkt", __func__));
 1124 
 1125                 /*
 1126                  * Stream sockets do not have packet boundaries, so
 1127                  * we have to allocate a header mbuf and attach the
 1128                  * stream of data to it.
 1129                  */
 1130                 if (so->so_type == SOCK_STREAM) {
 1131                         struct mbuf *mh;
 1132 
 1133                         mh = m_gethdr(M_NOWAIT, MT_DATA);
 1134                         if (mh == NULL) {
 1135                                 m_freem(m);
 1136                                 if (sa != NULL)
 1137                                         free(sa, M_SONAME);
 1138                                 break;
 1139                         }
 1140 
 1141                         mh->m_next = m;
 1142                         for (; m; m = m->m_next)
 1143                                 mh->m_pkthdr.len += m->m_len;
 1144                         m = mh;
 1145                 }
 1146 
 1147                 /* Put peer's socket address (if any) into a tag */
 1148                 if (sa != NULL) {
 1149                         struct sa_tag   *stag;
 1150 
 1151                         stag = (struct sa_tag *)m_tag_alloc(NGM_KSOCKET_COOKIE,
 1152                             NG_KSOCKET_TAG_SOCKADDR, sizeof(ng_ID_t) +
 1153                             sa->sa_len, M_NOWAIT);
 1154                         if (stag == NULL) {
 1155                                 free(sa, M_SONAME);
 1156                                 goto sendit;
 1157                         }
 1158                         bcopy(sa, &stag->sa, sa->sa_len);
 1159                         free(sa, M_SONAME);
 1160                         stag->id = NG_NODE_ID(node);
 1161                         m_tag_prepend(m, &stag->tag);
 1162                 }
 1163 
 1164 sendit:         /* Forward data with optional peer sockaddr as packet tag */
 1165                 NG_SEND_DATA_ONLY(error, priv->hook, m);
 1166         }
 1167 
 1168         /*
 1169          * If the peer has closed the connection, forward a 0-length mbuf
 1170          * to indicate end-of-file.
 1171          */
 1172         if (so->so_rcv.sb_state & SBS_CANTRCVMORE &&
 1173             !(priv->flags & KSF_EOFSEEN)) {
 1174                 struct mbuf *m;
 1175 
 1176                 m = m_gethdr(M_NOWAIT, MT_DATA);
 1177                 if (m != NULL)
 1178                         NG_SEND_DATA_ONLY(error, priv->hook, m);
 1179                 priv->flags |= KSF_EOFSEEN;
 1180         }
 1181 }
 1182 
 1183 /*
 1184  * Check for a completed incoming connection and return 0 if one is found.
 1185  * Otherwise return the appropriate error code.
 1186  */
 1187 static int
 1188 ng_ksocket_check_accept(priv_p priv)
 1189 {
 1190         struct socket *const head = priv->so;
 1191         int error;
 1192 
 1193         if ((error = head->so_error) != 0) {
 1194                 head->so_error = 0;
 1195                 return error;
 1196         }
 1197         /* Unlocked read. */
 1198         if (TAILQ_EMPTY(&head->so_comp)) {
 1199                 if (head->so_rcv.sb_state & SBS_CANTRCVMORE)
 1200                         return ECONNABORTED;
 1201                 return EWOULDBLOCK;
 1202         }
 1203         return 0;
 1204 }
 1205 
 1206 /*
 1207  * Handle the first completed incoming connection, assumed to be already
 1208  * on the socket's so_comp queue.
 1209  */
 1210 static void
 1211 ng_ksocket_finish_accept(priv_p priv)
 1212 {
 1213         struct socket *const head = priv->so;
 1214         struct socket *so;
 1215         struct sockaddr *sa = NULL;
 1216         struct ng_mesg *resp;
 1217         struct ng_ksocket_accept *resp_data;
 1218         node_p node;
 1219         priv_p priv2;
 1220         int len;
 1221         int error;
 1222 
 1223         ACCEPT_LOCK();
 1224         so = TAILQ_FIRST(&head->so_comp);
 1225         if (so == NULL) {       /* Should never happen */
 1226                 ACCEPT_UNLOCK();
 1227                 return;
 1228         }
 1229         TAILQ_REMOVE(&head->so_comp, so, so_list);
 1230         head->so_qlen--;
 1231         so->so_qstate &= ~SQ_COMP;
 1232         so->so_head = NULL;
 1233         SOCK_LOCK(so);
 1234         soref(so);
 1235         so->so_state |= SS_NBIO;
 1236         SOCK_UNLOCK(so);
 1237         ACCEPT_UNLOCK();
 1238 
 1239         /* XXX KNOTE_UNLOCKED(&head->so_rcv.sb_sel.si_note, 0); */
 1240 
 1241         soaccept(so, &sa);
 1242 
 1243         len = OFFSETOF(struct ng_ksocket_accept, addr);
 1244         if (sa != NULL)
 1245                 len += sa->sa_len;
 1246 
 1247         NG_MKMESSAGE(resp, NGM_KSOCKET_COOKIE, NGM_KSOCKET_ACCEPT, len,
 1248             M_NOWAIT);
 1249         if (resp == NULL) {
 1250                 soclose(so);
 1251                 goto out;
 1252         }
 1253         resp->header.flags |= NGF_RESP;
 1254         resp->header.token = priv->response_token;
 1255 
 1256         /* Clone a ksocket node to wrap the new socket */
 1257         error = ng_make_node_common(&ng_ksocket_typestruct, &node);
 1258         if (error) {
 1259                 free(resp, M_NETGRAPH);
 1260                 soclose(so);
 1261                 goto out;
 1262         }
 1263 
 1264         if (ng_ksocket_constructor(node) != 0) {
 1265                 NG_NODE_UNREF(node);
 1266                 free(resp, M_NETGRAPH);
 1267                 soclose(so);
 1268                 goto out;
 1269         }
 1270 
 1271         priv2 = NG_NODE_PRIVATE(node);
 1272         priv2->so = so;
 1273         priv2->flags |= KSF_CLONED | KSF_EMBRYONIC;
 1274 
 1275         /*
 1276          * Insert the cloned node into a list of embryonic children
 1277          * on the parent node.  When a hook is created on the cloned
 1278          * node it will be removed from this list.  When the parent
 1279          * is destroyed it will destroy any embryonic children it has.
 1280          */
 1281         LIST_INSERT_HEAD(&priv->embryos, priv2, siblings);
 1282 
 1283         SOCKBUF_LOCK(&so->so_rcv);
 1284         soupcall_set(so, SO_RCV, ng_ksocket_incoming, node);
 1285         SOCKBUF_UNLOCK(&so->so_rcv);
 1286         SOCKBUF_LOCK(&so->so_snd);
 1287         soupcall_set(so, SO_SND, ng_ksocket_incoming, node);
 1288         SOCKBUF_UNLOCK(&so->so_snd);
 1289 
 1290         /* Fill in the response data and send it or return it to the caller */
 1291         resp_data = (struct ng_ksocket_accept *)resp->data;
 1292         resp_data->nodeid = NG_NODE_ID(node);
 1293         if (sa != NULL)
 1294                 bcopy(sa, &resp_data->addr, sa->sa_len);
 1295         NG_SEND_MSG_ID(error, node, resp, priv->response_addr, 0);
 1296 
 1297 out:
 1298         if (sa != NULL)
 1299                 free(sa, M_SONAME);
 1300 }
 1301 
 1302 /*
 1303  * Parse out either an integer value or an alias.
 1304  */
 1305 static int
 1306 ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
 1307         const char *s, int family)
 1308 {
 1309         int k, val;
 1310         char *eptr;
 1311 
 1312         /* Try aliases */
 1313         for (k = 0; aliases[k].name != NULL; k++) {
 1314                 if (strcmp(s, aliases[k].name) == 0
 1315                     && aliases[k].family == family)
 1316                         return aliases[k].value;
 1317         }
 1318 
 1319         /* Try parsing as a number */
 1320         val = (int)strtoul(s, &eptr, 10);
 1321         if (val < 0 || *eptr != '\0')
 1322                 return (-1);
 1323         return (val);
 1324 }
 1325 

Cache object: cf7d16ce17b9666bd8b548f302f852e6


[ 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.