[ 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  -  FREEBSD10  -  FREEBSD9  -  FREEBSD92  -  FREEBSD91  -  FREEBSD90  -  FREEBSD8  -  FREEBSD82  -  FREEBSD81  -  FREEBSD80  -  FREEBSD7  -  FREEBSD74  -  FREEBSD73  -  FREEBSD72  -  FREEBSD71  -  FREEBSD70  -  FREEBSD6  -  FREEBSD64  -  FREEBSD63  -  FREEBSD62  -  FREEBSD61  -  FREEBSD60  -  FREEBSD5  -  FREEBSD55  -  FREEBSD54  -  FREEBSD53  -  FREEBSD52  -  FREEBSD51  -  FREEBSD50  -  FREEBSD4  -  FREEBSD3  -  FREEBSD22  -  cheribsd  -  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  -  FREEBSD-LIBC  -  FREEBSD8-LIBC  -  FREEBSD7-LIBC  -  FREEBSD6-LIBC  -  GLIBC27 
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: src/sys/netgraph/ng_ksocket.c,v 1.55.2.3 2006/02/24 11:23:05 ru Exp $
   41  * $Whistle: ng_ksocket.c,v 1.1 1999/11/16 20:04:40 archie Exp $
   42  */
   43 
   44 /*
   45  * Kernel socket node type.  This node type is basically a kernel-mode
   46  * version of a socket... kindof like the reverse of the socket node type.
   47  */
   48 
   49 #include <sys/param.h>
   50 #include <sys/systm.h>
   51 #include <sys/kernel.h>
   52 #include <sys/mbuf.h>
   53 #include <sys/proc.h>
   54 #include <sys/malloc.h>
   55 #include <sys/ctype.h>
   56 #include <sys/protosw.h>
   57 #include <sys/errno.h>
   58 #include <sys/socket.h>
   59 #include <sys/socketvar.h>
   60 #include <sys/uio.h>
   61 #include <sys/un.h>
   62 
   63 #include <netgraph/ng_message.h>
   64 #include <netgraph/netgraph.h>
   65 #include <netgraph/ng_parse.h>
   66 #include <netgraph/ng_ksocket.h>
   67 
   68 #include <netinet/in.h>
   69 #include <netatalk/at.h>
   70 
   71 #ifdef NG_SEPARATE_MALLOC
   72 MALLOC_DEFINE(M_NETGRAPH_KSOCKET, "netgraph_ksock", "netgraph ksock node ");
   73 #else
   74 #define M_NETGRAPH_KSOCKET M_NETGRAPH
   75 #endif
   76 
   77 #define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0))
   78 #define SADATA_OFFSET   (OFFSETOF(struct sockaddr, sa_data))
   79 
   80 /* Node private data */
   81 struct ng_ksocket_private {
   82         node_p          node;
   83         hook_p          hook;
   84         struct socket   *so;
   85         LIST_HEAD(, ng_ksocket_private) embryos;
   86         LIST_ENTRY(ng_ksocket_private)  siblings;
   87         u_int32_t       flags;
   88         u_int32_t       response_token;
   89         ng_ID_t         response_addr;
   90 };
   91 typedef struct ng_ksocket_private *priv_p;
   92 
   93 /* Flags for priv_p */
   94 #define KSF_CONNECTING  0x00000001      /* Waiting for connection complete */
   95 #define KSF_ACCEPTING   0x00000002      /* Waiting for accept complete */
   96 #define KSF_EOFSEEN     0x00000004      /* Have sent 0-length EOF mbuf */
   97 #define KSF_CLONED      0x00000008      /* Cloned from an accepting socket */
   98 #define KSF_EMBRYONIC   0x00000010      /* Cloned node with no hooks yet */
   99 
  100 /* Netgraph node methods */
  101 static ng_constructor_t ng_ksocket_constructor;
  102 static ng_rcvmsg_t      ng_ksocket_rcvmsg;
  103 static ng_shutdown_t    ng_ksocket_shutdown;
  104 static ng_newhook_t     ng_ksocket_newhook;
  105 static ng_rcvdata_t     ng_ksocket_rcvdata;
  106 static ng_connect_t     ng_ksocket_connect;
  107 static ng_disconnect_t  ng_ksocket_disconnect;
  108 
  109 /* Alias structure */
  110 struct ng_ksocket_alias {
  111         const char      *name;
  112         const int       value;
  113         const int       family;
  114 };
  115 
  116 /* Protocol family aliases */
  117 static const struct ng_ksocket_alias ng_ksocket_families[] = {
  118         { "local",      PF_LOCAL        },
  119         { "inet",       PF_INET         },
  120         { "inet6",      PF_INET6        },
  121         { "atalk",      PF_APPLETALK    },
  122         { "ipx",        PF_IPX          },
  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         { "ddp",        ATPROTO_DDP,            PF_APPLETALK    },
  153         { "aarp",       ATPROTO_AARP,           PF_APPLETALK    },
  154         { NULL,         -1                                      },
  155 };
  156 
  157 /* Helper functions */
  158 static int      ng_ksocket_check_accept(priv_p);
  159 static void     ng_ksocket_finish_accept(priv_p);
  160 static void     ng_ksocket_incoming(struct socket *so, void *arg, int waitflag);
  161 static int      ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
  162                         const char *s, int family);
  163 static void     ng_ksocket_incoming2(node_p node, hook_p hook,
  164                         void *arg1, int waitflag);
  165 
  166 /************************************************************************
  167                         STRUCT SOCKADDR PARSE TYPE
  168  ************************************************************************/
  169 
  170 /* Get the length of the data portion of a generic struct sockaddr */
  171 static int
  172 ng_parse_generic_sockdata_getLength(const struct ng_parse_type *type,
  173         const u_char *start, const u_char *buf)
  174 {
  175         const struct sockaddr *sa;
  176 
  177         sa = (const struct sockaddr *)(buf - SADATA_OFFSET);
  178         return (sa->sa_len < SADATA_OFFSET) ? 0 : sa->sa_len - SADATA_OFFSET;
  179 }
  180 
  181 /* Type for the variable length data portion of a generic struct sockaddr */
  182 static const struct ng_parse_type ng_ksocket_generic_sockdata_type = {
  183         &ng_parse_bytearray_type,
  184         &ng_parse_generic_sockdata_getLength
  185 };
  186 
  187 /* Type for a generic struct sockaddr */
  188 static const struct ng_parse_struct_field
  189     ng_parse_generic_sockaddr_type_fields[] = {
  190           { "len",      &ng_parse_uint8_type                    },
  191           { "family",   &ng_parse_uint8_type                    },
  192           { "data",     &ng_ksocket_generic_sockdata_type       },
  193           { NULL }
  194 };
  195 static const struct ng_parse_type ng_ksocket_generic_sockaddr_type = {
  196         &ng_parse_struct_type,
  197         &ng_parse_generic_sockaddr_type_fields
  198 };
  199 
  200 /* Convert a struct sockaddr from ASCII to binary.  If its a protocol
  201    family that we specially handle, do that, otherwise defer to the
  202    generic parse type ng_ksocket_generic_sockaddr_type. */
  203 static int
  204 ng_ksocket_sockaddr_parse(const struct ng_parse_type *type,
  205         const char *s, int *off, const u_char *const start,
  206         u_char *const buf, int *buflen)
  207 {
  208         struct sockaddr *const sa = (struct sockaddr *)buf;
  209         enum ng_parse_token tok;
  210         char fambuf[32];
  211         int family, len;
  212         char *t;
  213 
  214         /* If next token is a left curly brace, use generic parse type */
  215         if ((tok = ng_parse_get_token(s, off, &len)) == T_LBRACE) {
  216                 return (*ng_ksocket_generic_sockaddr_type.supertype->parse)
  217                     (&ng_ksocket_generic_sockaddr_type,
  218                     s, off, start, buf, buflen);
  219         }
  220 
  221         /* Get socket address family followed by a slash */
  222         while (isspace(s[*off]))
  223                 (*off)++;
  224         if ((t = index(s + *off, '/')) == NULL)
  225                 return (EINVAL);
  226         if ((len = t - (s + *off)) > sizeof(fambuf) - 1)
  227                 return (EINVAL);
  228         strncpy(fambuf, s + *off, len);
  229         fambuf[len] = '\0';
  230         *off += len + 1;
  231         if ((family = ng_ksocket_parse(ng_ksocket_families, fambuf, 0)) == -1)
  232                 return (EINVAL);
  233 
  234         /* Set family */
  235         if (*buflen < SADATA_OFFSET)
  236                 return (ERANGE);
  237         sa->sa_family = family;
  238 
  239         /* Set family-specific data and length */
  240         switch (sa->sa_family) {
  241         case PF_LOCAL:          /* Get pathname */
  242             {
  243                 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
  244                 struct sockaddr_un *const sun = (struct sockaddr_un *)sa;
  245                 int toklen, pathlen;
  246                 char *path;
  247 
  248                 if ((path = ng_get_string_token(s, off, &toklen, NULL)) == NULL)
  249                         return (EINVAL);
  250                 pathlen = strlen(path);
  251                 if (pathlen > SOCK_MAXADDRLEN) {
  252                         FREE(path, M_NETGRAPH_KSOCKET);
  253                         return (E2BIG);
  254                 }
  255                 if (*buflen < pathoff + pathlen) {
  256                         FREE(path, M_NETGRAPH_KSOCKET);
  257                         return (ERANGE);
  258                 }
  259                 *off += toklen;
  260                 bcopy(path, sun->sun_path, pathlen);
  261                 sun->sun_len = pathoff + pathlen;
  262                 FREE(path, M_NETGRAPH_KSOCKET);
  263                 break;
  264             }
  265 
  266         case PF_INET:           /* Get an IP address with optional port */
  267             {
  268                 struct sockaddr_in *const sin = (struct sockaddr_in *)sa;
  269                 int i;
  270 
  271                 /* Parse this: <ipaddress>[:port] */
  272                 for (i = 0; i < 4; i++) {
  273                         u_long val;
  274                         char *eptr;
  275 
  276                         val = strtoul(s + *off, &eptr, 10);
  277                         if (val > 0xff || eptr == s + *off)
  278                                 return (EINVAL);
  279                         *off += (eptr - (s + *off));
  280                         ((u_char *)&sin->sin_addr)[i] = (u_char)val;
  281                         if (i < 3) {
  282                                 if (s[*off] != '.')
  283                                         return (EINVAL);
  284                                 (*off)++;
  285                         } else if (s[*off] == ':') {
  286                                 (*off)++;
  287                                 val = strtoul(s + *off, &eptr, 10);
  288                                 if (val > 0xffff || eptr == s + *off)
  289                                         return (EINVAL);
  290                                 *off += (eptr - (s + *off));
  291                                 sin->sin_port = htons(val);
  292                         } else
  293                                 sin->sin_port = 0;
  294                 }
  295                 bzero(&sin->sin_zero, sizeof(sin->sin_zero));
  296                 sin->sin_len = sizeof(*sin);
  297                 break;
  298             }
  299 
  300 #if 0
  301         case PF_APPLETALK:      /* XXX implement these someday */
  302         case PF_INET6:
  303         case PF_IPX:
  304 #endif
  305 
  306         default:
  307                 return (EINVAL);
  308         }
  309 
  310         /* Done */
  311         *buflen = sa->sa_len;
  312         return (0);
  313 }
  314 
  315 /* Convert a struct sockaddr from binary to ASCII */
  316 static int
  317 ng_ksocket_sockaddr_unparse(const struct ng_parse_type *type,
  318         const u_char *data, int *off, char *cbuf, int cbuflen)
  319 {
  320         const struct sockaddr *sa = (const struct sockaddr *)(data + *off);
  321         int slen = 0;
  322 
  323         /* Output socket address, either in special or generic format */
  324         switch (sa->sa_family) {
  325         case PF_LOCAL:
  326             {
  327                 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
  328                 const struct sockaddr_un *sun = (const struct sockaddr_un *)sa;
  329                 const int pathlen = sun->sun_len - pathoff;
  330                 char pathbuf[SOCK_MAXADDRLEN + 1];
  331                 char *pathtoken;
  332 
  333                 bcopy(sun->sun_path, pathbuf, pathlen);
  334                 if ((pathtoken = ng_encode_string(pathbuf, pathlen)) == NULL)
  335                         return (ENOMEM);
  336                 slen += snprintf(cbuf, cbuflen, "local/%s", pathtoken);
  337                 FREE(pathtoken, M_NETGRAPH_KSOCKET);
  338                 if (slen >= cbuflen)
  339                         return (ERANGE);
  340                 *off += sun->sun_len;
  341                 return (0);
  342             }
  343 
  344         case PF_INET:
  345             {
  346                 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
  347 
  348                 slen += snprintf(cbuf, cbuflen, "inet/%d.%d.%d.%d",
  349                   ((const u_char *)&sin->sin_addr)[0],
  350                   ((const u_char *)&sin->sin_addr)[1],
  351                   ((const u_char *)&sin->sin_addr)[2],
  352                   ((const u_char *)&sin->sin_addr)[3]);
  353                 if (sin->sin_port != 0) {
  354                         slen += snprintf(cbuf + strlen(cbuf),
  355                             cbuflen - strlen(cbuf), ":%d",
  356                             (u_int)ntohs(sin->sin_port));
  357                 }
  358                 if (slen >= cbuflen)
  359                         return (ERANGE);
  360                 *off += sizeof(*sin);
  361                 return(0);
  362             }
  363 
  364 #if 0
  365         case PF_APPLETALK:      /* XXX implement these someday */
  366         case PF_INET6:
  367         case PF_IPX:
  368 #endif
  369 
  370         default:
  371                 return (*ng_ksocket_generic_sockaddr_type.supertype->unparse)
  372                     (&ng_ksocket_generic_sockaddr_type,
  373                     data, off, cbuf, cbuflen);
  374         }
  375 }
  376 
  377 /* Parse type for struct sockaddr */
  378 static const struct ng_parse_type ng_ksocket_sockaddr_type = {
  379         NULL,
  380         NULL,
  381         NULL,
  382         &ng_ksocket_sockaddr_parse,
  383         &ng_ksocket_sockaddr_unparse,
  384         NULL            /* no such thing as a default struct sockaddr */
  385 };
  386 
  387 /************************************************************************
  388                 STRUCT NG_KSOCKET_SOCKOPT PARSE TYPE
  389  ************************************************************************/
  390 
  391 /* Get length of the struct ng_ksocket_sockopt value field, which is the
  392    just the excess of the message argument portion over the length of
  393    the struct ng_ksocket_sockopt. */
  394 static int
  395 ng_parse_sockoptval_getLength(const struct ng_parse_type *type,
  396         const u_char *start, const u_char *buf)
  397 {
  398         static const int offset = OFFSETOF(struct ng_ksocket_sockopt, value);
  399         const struct ng_ksocket_sockopt *sopt;
  400         const struct ng_mesg *msg;
  401 
  402         sopt = (const struct ng_ksocket_sockopt *)(buf - offset);
  403         msg = (const struct ng_mesg *)((const u_char *)sopt - sizeof(*msg));
  404         return msg->header.arglen - sizeof(*sopt);
  405 }
  406 
  407 /* Parse type for the option value part of a struct ng_ksocket_sockopt
  408    XXX Eventually, we should handle the different socket options specially.
  409    XXX This would avoid byte order problems, eg an integer value of 1 is
  410    XXX going to be "[1]" for little endian or "[3=1]" for big endian. */
  411 static const struct ng_parse_type ng_ksocket_sockoptval_type = {
  412         &ng_parse_bytearray_type,
  413         &ng_parse_sockoptval_getLength
  414 };
  415 
  416 /* Parse type for struct ng_ksocket_sockopt */
  417 static const struct ng_parse_struct_field ng_ksocket_sockopt_type_fields[]
  418         = NG_KSOCKET_SOCKOPT_INFO(&ng_ksocket_sockoptval_type);
  419 static const struct ng_parse_type ng_ksocket_sockopt_type = {
  420         &ng_parse_struct_type,
  421         &ng_ksocket_sockopt_type_fields
  422 };
  423 
  424 /* Parse type for struct ng_ksocket_accept */
  425 static const struct ng_parse_struct_field ng_ksocket_accept_type_fields[]
  426         = NGM_KSOCKET_ACCEPT_INFO;
  427 static const struct ng_parse_type ng_ksocket_accept_type = {
  428         &ng_parse_struct_type,
  429         &ng_ksocket_accept_type_fields
  430 };
  431 
  432 /* List of commands and how to convert arguments to/from ASCII */
  433 static const struct ng_cmdlist ng_ksocket_cmds[] = {
  434         {
  435           NGM_KSOCKET_COOKIE,
  436           NGM_KSOCKET_BIND,
  437           "bind",
  438           &ng_ksocket_sockaddr_type,
  439           NULL
  440         },
  441         {
  442           NGM_KSOCKET_COOKIE,
  443           NGM_KSOCKET_LISTEN,
  444           "listen",
  445           &ng_parse_int32_type,
  446           NULL
  447         },
  448         {
  449           NGM_KSOCKET_COOKIE,
  450           NGM_KSOCKET_ACCEPT,
  451           "accept",
  452           NULL,
  453           &ng_ksocket_accept_type
  454         },
  455         {
  456           NGM_KSOCKET_COOKIE,
  457           NGM_KSOCKET_CONNECT,
  458           "connect",
  459           &ng_ksocket_sockaddr_type,
  460           &ng_parse_int32_type
  461         },
  462         {
  463           NGM_KSOCKET_COOKIE,
  464           NGM_KSOCKET_GETNAME,
  465           "getname",
  466           NULL,
  467           &ng_ksocket_sockaddr_type
  468         },
  469         {
  470           NGM_KSOCKET_COOKIE,
  471           NGM_KSOCKET_GETPEERNAME,
  472           "getpeername",
  473           NULL,
  474           &ng_ksocket_sockaddr_type
  475         },
  476         {
  477           NGM_KSOCKET_COOKIE,
  478           NGM_KSOCKET_SETOPT,
  479           "setopt",
  480           &ng_ksocket_sockopt_type,
  481           NULL
  482         },
  483         {
  484           NGM_KSOCKET_COOKIE,
  485           NGM_KSOCKET_GETOPT,
  486           "getopt",
  487           &ng_ksocket_sockopt_type,
  488           &ng_ksocket_sockopt_type
  489         },
  490         { 0 }
  491 };
  492 
  493 /* Node type descriptor */
  494 static struct ng_type ng_ksocket_typestruct = {
  495         .version =      NG_ABI_VERSION,
  496         .name =         NG_KSOCKET_NODE_TYPE,
  497         .constructor =  ng_ksocket_constructor,
  498         .rcvmsg =       ng_ksocket_rcvmsg,
  499         .shutdown =     ng_ksocket_shutdown,
  500         .newhook =      ng_ksocket_newhook,
  501         .connect =      ng_ksocket_connect,
  502         .rcvdata =      ng_ksocket_rcvdata,
  503         .disconnect =   ng_ksocket_disconnect,
  504         .cmdlist =      ng_ksocket_cmds,
  505 };
  506 NETGRAPH_INIT(ksocket, &ng_ksocket_typestruct);
  507 
  508 #define ERROUT(x)       do { error = (x); goto done; } while (0)
  509 
  510 /************************************************************************
  511                         NETGRAPH NODE STUFF
  512  ************************************************************************/
  513 
  514 /*
  515  * Node type constructor
  516  * The NODE part is assumed to be all set up.
  517  * There is already a reference to the node for us.
  518  */
  519 static int
  520 ng_ksocket_constructor(node_p node)
  521 {
  522         priv_p priv;
  523 
  524         /* Allocate private structure */
  525         MALLOC(priv, priv_p, sizeof(*priv),
  526             M_NETGRAPH_KSOCKET, M_NOWAIT | M_ZERO);
  527         if (priv == NULL)
  528                 return (ENOMEM);
  529 
  530         LIST_INIT(&priv->embryos);
  531         /* cross link them */
  532         priv->node = node;
  533         NG_NODE_SET_PRIVATE(node, priv);
  534 
  535         /* Done */
  536         return (0);
  537 }
  538 
  539 /*
  540  * Give our OK for a hook to be added. The hook name is of the
  541  * form "<family>/<type>/<proto>" where the three components may
  542  * be decimal numbers or else aliases from the above lists.
  543  *
  544  * Connecting a hook amounts to opening the socket.  Disconnecting
  545  * the hook closes the socket and destroys the node as well.
  546  */
  547 static int
  548 ng_ksocket_newhook(node_p node, hook_p hook, const char *name0)
  549 {
  550         struct thread *td = curthread;  /* XXX broken */
  551         const priv_p priv = NG_NODE_PRIVATE(node);
  552         char *s1, *s2, name[NG_HOOKSIZ];
  553         int family, type, protocol, error;
  554 
  555         /* Check if we're already connected */
  556         if (priv->hook != NULL)
  557                 return (EISCONN);
  558 
  559         if (priv->flags & KSF_CLONED) {
  560                 if (priv->flags & KSF_EMBRYONIC) {
  561                         /* Remove ourselves from our parent's embryo list */
  562                         LIST_REMOVE(priv, siblings);
  563                         priv->flags &= ~KSF_EMBRYONIC;
  564                 }
  565         } else {
  566                 /* Extract family, type, and protocol from hook name */
  567                 snprintf(name, sizeof(name), "%s", name0);
  568                 s1 = name;
  569                 if ((s2 = index(s1, '/')) == NULL)
  570                         return (EINVAL);
  571                 *s2++ = '\0';
  572                 family = ng_ksocket_parse(ng_ksocket_families, s1, 0);
  573                 if (family == -1)
  574                         return (EINVAL);
  575                 s1 = s2;
  576                 if ((s2 = index(s1, '/')) == NULL)
  577                         return (EINVAL);
  578                 *s2++ = '\0';
  579                 type = ng_ksocket_parse(ng_ksocket_types, s1, 0);
  580                 if (type == -1)
  581                         return (EINVAL);
  582                 s1 = s2;
  583                 protocol = ng_ksocket_parse(ng_ksocket_protos, s1, family);
  584                 if (protocol == -1)
  585                         return (EINVAL);
  586 
  587                 /* Create the socket */
  588                 error = socreate(family, &priv->so, type, protocol,
  589                    td->td_ucred, td);
  590                 if (error != 0)
  591                         return (error);
  592 
  593                 /* XXX call soreserve() ? */
  594 
  595         }
  596 
  597         /* OK */
  598         priv->hook = hook;
  599 
  600         /*
  601          * In case of misconfigured routing a packet may reenter
  602          * ksocket node recursively. Decouple stack to avoid possible
  603          * panics about sleeping with locks held.
  604          */
  605         NG_HOOK_FORCE_QUEUE(hook);
  606 
  607         return(0);
  608 }
  609 
  610 static int
  611 ng_ksocket_connect(hook_p hook)
  612 {
  613         node_p node = NG_HOOK_NODE(hook);
  614         const priv_p priv = NG_NODE_PRIVATE(node);
  615         struct socket *const so = priv->so;
  616 
  617         /* Add our hook for incoming data and other events */
  618         priv->so->so_upcallarg = (caddr_t)node;
  619         priv->so->so_upcall = ng_ksocket_incoming;
  620         SOCKBUF_LOCK(&priv->so->so_rcv);
  621         priv->so->so_rcv.sb_flags |= SB_UPCALL;
  622         SOCKBUF_UNLOCK(&priv->so->so_rcv);
  623         SOCKBUF_LOCK(&priv->so->so_snd);
  624         priv->so->so_snd.sb_flags |= SB_UPCALL;
  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         struct sa_tag *stag;
  907 
  908         /* Extract data */
  909         NGI_GET_M(item, m);
  910         NG_FREE_ITEM(item);
  911 
  912         /*
  913          * Look if socket address is stored in packet tags.
  914          * If sockaddr is ours, or provided by a third party (zero id),
  915          * then we accept it.
  916          */
  917         if (((stag = (struct sa_tag *)m_tag_locate(m, NGM_KSOCKET_COOKIE,
  918             NG_KSOCKET_TAG_SOCKADDR, NULL)) != NULL) &&
  919             (stag->id == NG_NODE_ID(node) || stag->id == 0))
  920                 sa = &stag->sa;
  921 
  922         /* Send packet */
  923         error = (*so->so_proto->pr_usrreqs->pru_sosend)(so, sa, 0, m, 0, 0, td);
  924 
  925         return (error);
  926 }
  927 
  928 /*
  929  * Destroy node
  930  */
  931 static int
  932 ng_ksocket_shutdown(node_p node)
  933 {
  934         const priv_p priv = NG_NODE_PRIVATE(node);
  935         priv_p embryo;
  936 
  937         /* Close our socket (if any) */
  938         if (priv->so != NULL) {
  939                 priv->so->so_upcall = NULL;
  940                 SOCKBUF_LOCK(&priv->so->so_rcv);
  941                 priv->so->so_rcv.sb_flags &= ~SB_UPCALL;
  942                 SOCKBUF_UNLOCK(&priv->so->so_rcv);
  943                 SOCKBUF_LOCK(&priv->so->so_snd);
  944                 priv->so->so_snd.sb_flags &= ~SB_UPCALL;
  945                 SOCKBUF_UNLOCK(&priv->so->so_snd);
  946                 soclose(priv->so);
  947                 priv->so = NULL;
  948         }
  949 
  950         /* If we are an embryo, take ourselves out of the parent's list */
  951         if (priv->flags & KSF_EMBRYONIC) {
  952                 LIST_REMOVE(priv, siblings);
  953                 priv->flags &= ~KSF_EMBRYONIC;
  954         }
  955 
  956         /* Remove any embryonic children we have */
  957         while (!LIST_EMPTY(&priv->embryos)) {
  958                 embryo = LIST_FIRST(&priv->embryos);
  959                 ng_rmnode_self(embryo->node);
  960         }
  961 
  962         /* Take down netgraph node */
  963         bzero(priv, sizeof(*priv));
  964         FREE(priv, M_NETGRAPH_KSOCKET);
  965         NG_NODE_SET_PRIVATE(node, NULL);
  966         NG_NODE_UNREF(node);            /* let the node escape */
  967         return (0);
  968 }
  969 
  970 /*
  971  * Hook disconnection
  972  */
  973 static int
  974 ng_ksocket_disconnect(hook_p hook)
  975 {
  976         KASSERT(NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0,
  977             ("%s: numhooks=%d?", __func__,
  978             NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook))));
  979         if (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))
  980                 ng_rmnode_self(NG_HOOK_NODE(hook));
  981         return (0);
  982 }
  983 
  984 /************************************************************************
  985                         HELPER STUFF
  986  ************************************************************************/
  987 /* 
  988  * You should no-longer "just call" a netgraph node function
  989  * from an external asynchronous event.
  990  * This is because in doing so you are ignoring the locking on the netgraph
  991  * nodes. Instead call your function via 
  992  * "int ng_send_fn(node_p node, hook_p hook, ng_item_fn *fn,
  993  *       void *arg1, int arg2);"
  994  * this will call the function you chose, but will first do all the 
  995  * locking rigmarole. Your function MAY only be called at some distant future
  996  * time (several millisecs away) so don't give it any arguments
  997  * that may be revoked soon (e.g. on your stack).
  998  * In this case even the 'so' argument is doubtful. 
  999  * While the function request is being processed the node
 1000  * has an extra reference and as such will not disappear until
 1001  * the request has at least been done, but the 'so' may not be so lucky.
 1002  * handle this by checking the validity of the node in the target function
 1003  * before dereferencing the socket pointer.
 1004  *
 1005  * To decouple stack, we use queue version of ng_send_fn().
 1006  */
 1007 
 1008 static void
 1009 ng_ksocket_incoming(struct socket *so, void *arg, int waitflag)
 1010 {
 1011         const node_p node = arg;
 1012         int wait;
 1013 
 1014         wait = (waitflag & M_WAITOK) ? NG_WAITOK : 0;
 1015         ng_send_fn1(node, NULL, &ng_ksocket_incoming2, so, waitflag,
 1016             wait | NG_QUEUE);
 1017 }
 1018 
 1019 
 1020 /*
 1021  * When incoming data is appended to the socket, we get notified here.
 1022  * This is also called whenever a significant event occurs for the socket.
 1023  * We know that HOOK is NULL. Because of how we were called we know we have a 
 1024  * lock on this node an are participating inthe netgraph locking.
 1025  * Our original caller may have queued this even some time ago and 
 1026  * we cannot trust that he even still exists. The node however is being
 1027  * held with a reference by the queueing code, at least until we finish,
 1028  * even if it has been zapped, so first check it's validiy 
 1029  * before we trust the socket (which was derived from it).
 1030  */
 1031 static void
 1032 ng_ksocket_incoming2(node_p node, hook_p hook, void *arg1, int waitflag)
 1033 {
 1034         struct socket *so = arg1;
 1035         const priv_p priv = NG_NODE_PRIVATE(node);
 1036         struct mbuf *m;
 1037         struct ng_mesg *response;
 1038         struct uio auio;
 1039         int s, flags, error;
 1040 
 1041         s = splnet();
 1042 
 1043         /* Sanity check */
 1044         if (NG_NODE_NOT_VALID(node)) {
 1045                 splx(s);
 1046                 return;
 1047         }
 1048         /* so = priv->so; *//* XXX could have derived this like so */
 1049         KASSERT(so == priv->so, ("%s: wrong socket", __func__));
 1050 
 1051         /* Check whether a pending connect operation has completed */
 1052         if (priv->flags & KSF_CONNECTING) {
 1053                 if ((error = so->so_error) != 0) {
 1054                         so->so_error = 0;
 1055                         so->so_state &= ~SS_ISCONNECTING;
 1056                 }
 1057                 if (!(so->so_state & SS_ISCONNECTING)) {
 1058                         NG_MKMESSAGE(response, NGM_KSOCKET_COOKIE,
 1059                             NGM_KSOCKET_CONNECT, sizeof(int32_t), waitflag);
 1060                         if (response != NULL) {
 1061                                 response->header.flags |= NGF_RESP;
 1062                                 response->header.token = priv->response_token;
 1063                                 *(int32_t *)response->data = error;
 1064                                 /* 
 1065                                  * send an async "response" message
 1066                                  * to the node that set us up
 1067                                  * (if it still exists)
 1068                                  */
 1069                                 NG_SEND_MSG_ID(error, node,
 1070                                     response, priv->response_addr, 0);
 1071                         }
 1072                         priv->flags &= ~KSF_CONNECTING;
 1073                 }
 1074         }
 1075 
 1076         /* Check whether a pending accept operation has completed */
 1077         if (priv->flags & KSF_ACCEPTING) {
 1078                 error = ng_ksocket_check_accept(priv);
 1079                 if (error != EWOULDBLOCK)
 1080                         priv->flags &= ~KSF_ACCEPTING;
 1081                 if (error == 0)
 1082                         ng_ksocket_finish_accept(priv);
 1083         }
 1084 
 1085         /*
 1086          * If we don't have a hook, we must handle data events later.  When
 1087          * the hook gets created and is connected, this upcall function
 1088          * will be called again.
 1089          */
 1090         if (priv->hook == NULL) {
 1091                 splx(s);
 1092                 return;
 1093         }
 1094 
 1095         /* Read and forward available mbuf's */
 1096         auio.uio_td = NULL;
 1097         auio.uio_resid = 1000000000;
 1098         flags = MSG_DONTWAIT;
 1099         while (1) {
 1100                 struct sockaddr *sa = NULL;
 1101                 struct mbuf *n;
 1102 
 1103                 /* Try to get next packet from socket */
 1104                 if ((error = (*so->so_proto->pr_usrreqs->pru_soreceive)
 1105                     (so, (so->so_state & SS_ISCONNECTED) ? NULL : &sa,
 1106                     &auio, &m, (struct mbuf **)0, &flags)) != 0)
 1107                         break;
 1108 
 1109                 /* See if we got anything */
 1110                 if (m == NULL) {
 1111                         if (sa != NULL)
 1112                                 FREE(sa, M_SONAME);
 1113                         break;
 1114                 }
 1115 
 1116                 /*
 1117                  * Don't trust the various socket layers to get the
 1118                  * packet header and length correct (e.g. kern/15175).
 1119                  *
 1120                  * Also, do not trust that soreceive() will clear m_nextpkt
 1121                  * for us (e.g. kern/84952, kern/82413).
 1122                  */
 1123                 m->m_pkthdr.csum_flags = 0;
 1124                 for (n = m, m->m_pkthdr.len = 0; n != NULL; n = n->m_next) {
 1125                         m->m_pkthdr.len += n->m_len;
 1126                         n->m_nextpkt = NULL;
 1127                 }
 1128 
 1129                 /* Put peer's socket address (if any) into a tag */
 1130                 if (sa != NULL) {
 1131                         struct sa_tag   *stag;
 1132 
 1133                         stag = (struct sa_tag *)m_tag_alloc(NGM_KSOCKET_COOKIE,
 1134                             NG_KSOCKET_TAG_SOCKADDR, sizeof(ng_ID_t) +
 1135                             sa->sa_len, M_NOWAIT);
 1136                         if (stag == NULL) {
 1137                                 FREE(sa, M_SONAME);
 1138                                 goto sendit;
 1139                         }
 1140                         bcopy(sa, &stag->sa, sa->sa_len);
 1141                         FREE(sa, M_SONAME);
 1142                         stag->id = NG_NODE_ID(node);
 1143                         m_tag_prepend(m, &stag->tag);
 1144                 }
 1145 
 1146 sendit:         /* Forward data with optional peer sockaddr as packet tag */
 1147                 NG_SEND_DATA_ONLY(error, priv->hook, m);
 1148         }
 1149 
 1150         /*
 1151          * If the peer has closed the connection, forward a 0-length mbuf
 1152          * to indicate end-of-file.
 1153          */
 1154         if (so->so_rcv.sb_state & SBS_CANTRCVMORE && !(priv->flags & KSF_EOFSEEN)) {
 1155                 MGETHDR(m, waitflag, MT_DATA);
 1156                 if (m != NULL) {
 1157                         m->m_len = m->m_pkthdr.len = 0;
 1158                         NG_SEND_DATA_ONLY(error, priv->hook, m);
 1159                 }
 1160                 priv->flags |= KSF_EOFSEEN;
 1161         }
 1162         splx(s);
 1163 }
 1164 
 1165 /*
 1166  * Check for a completed incoming connection and return 0 if one is found.
 1167  * Otherwise return the appropriate error code.
 1168  */
 1169 static int
 1170 ng_ksocket_check_accept(priv_p priv)
 1171 {
 1172         struct socket *const head = priv->so;
 1173         int error;
 1174 
 1175         if ((error = head->so_error) != 0) {
 1176                 head->so_error = 0;
 1177                 return error;
 1178         }
 1179         /* Unlocked read. */
 1180         if (TAILQ_EMPTY(&head->so_comp)) {
 1181                 if (head->so_rcv.sb_state & SBS_CANTRCVMORE)
 1182                         return ECONNABORTED;
 1183                 return EWOULDBLOCK;
 1184         }
 1185         return 0;
 1186 }
 1187 
 1188 /*
 1189  * Handle the first completed incoming connection, assumed to be already
 1190  * on the socket's so_comp queue.
 1191  */
 1192 static void
 1193 ng_ksocket_finish_accept(priv_p priv)
 1194 {
 1195         struct socket *const head = priv->so;
 1196         struct socket *so;
 1197         struct sockaddr *sa = NULL;
 1198         struct ng_mesg *resp;
 1199         struct ng_ksocket_accept *resp_data;
 1200         node_p node;
 1201         priv_p priv2;
 1202         int len;
 1203         int error;
 1204 
 1205         ACCEPT_LOCK();
 1206         so = TAILQ_FIRST(&head->so_comp);
 1207         if (so == NULL) {       /* Should never happen */
 1208                 ACCEPT_UNLOCK();
 1209                 return;
 1210         }
 1211         TAILQ_REMOVE(&head->so_comp, so, so_list);
 1212         head->so_qlen--;
 1213         so->so_qstate &= ~SQ_COMP;
 1214         so->so_head = NULL;
 1215         SOCK_LOCK(so);
 1216         soref(so);
 1217         so->so_state |= SS_NBIO;
 1218         SOCK_UNLOCK(so);
 1219         ACCEPT_UNLOCK();
 1220 
 1221         /* XXX KNOTE(&head->so_rcv.sb_sel.si_note, 0); */
 1222 
 1223         soaccept(so, &sa);
 1224 
 1225         len = OFFSETOF(struct ng_ksocket_accept, addr);
 1226         if (sa != NULL)
 1227                 len += sa->sa_len;
 1228 
 1229         NG_MKMESSAGE(resp, NGM_KSOCKET_COOKIE, NGM_KSOCKET_ACCEPT, len,
 1230             M_NOWAIT);
 1231         if (resp == NULL) {
 1232                 soclose(so);
 1233                 goto out;
 1234         }
 1235         resp->header.flags |= NGF_RESP;
 1236         resp->header.token = priv->response_token;
 1237 
 1238         /* Clone a ksocket node to wrap the new socket */
 1239         error = ng_make_node_common(&ng_ksocket_typestruct, &node);
 1240         if (error) {
 1241                 FREE(resp, M_NETGRAPH);
 1242                 soclose(so);
 1243                 goto out;
 1244         }
 1245 
 1246         if (ng_ksocket_constructor(node) != 0) {
 1247                 NG_NODE_UNREF(node);
 1248                 FREE(resp, M_NETGRAPH);
 1249                 soclose(so);
 1250                 goto out;
 1251         }
 1252 
 1253         priv2 = NG_NODE_PRIVATE(node);
 1254         priv2->so = so;
 1255         priv2->flags |= KSF_CLONED | KSF_EMBRYONIC;
 1256 
 1257         /*
 1258          * Insert the cloned node into a list of embryonic children
 1259          * on the parent node.  When a hook is created on the cloned
 1260          * node it will be removed from this list.  When the parent
 1261          * is destroyed it will destroy any embryonic children it has.
 1262          */
 1263         LIST_INSERT_HEAD(&priv->embryos, priv2, siblings);
 1264 
 1265         so->so_upcallarg = (caddr_t)node;
 1266         so->so_upcall = ng_ksocket_incoming;
 1267         SOCKBUF_LOCK(&so->so_rcv);
 1268         so->so_rcv.sb_flags |= SB_UPCALL;
 1269         SOCKBUF_UNLOCK(&so->so_rcv);
 1270         SOCKBUF_LOCK(&so->so_snd);
 1271         so->so_snd.sb_flags |= SB_UPCALL;
 1272         SOCKBUF_UNLOCK(&so->so_snd);
 1273 
 1274         /* Fill in the response data and send it or return it to the caller */
 1275         resp_data = (struct ng_ksocket_accept *)resp->data;
 1276         resp_data->nodeid = NG_NODE_ID(node);
 1277         if (sa != NULL)
 1278                 bcopy(sa, &resp_data->addr, sa->sa_len);
 1279         NG_SEND_MSG_ID(error, node, resp, priv->response_addr, 0);
 1280 
 1281 out:
 1282         if (sa != NULL)
 1283                 FREE(sa, M_SONAME);
 1284 }
 1285 
 1286 /*
 1287  * Parse out either an integer value or an alias.
 1288  */
 1289 static int
 1290 ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
 1291         const char *s, int family)
 1292 {
 1293         int k, val;
 1294         char *eptr;
 1295 
 1296         /* Try aliases */
 1297         for (k = 0; aliases[k].name != NULL; k++) {
 1298                 if (strcmp(s, aliases[k].name) == 0
 1299                     && aliases[k].family == family)
 1300                         return aliases[k].value;
 1301         }
 1302 
 1303         /* Try parsing as a number */
 1304         val = (int)strtoul(s, &eptr, 10);
 1305         if (val < 0 || *eptr != '\0')
 1306                 return (-1);
 1307         return (val);
 1308 }
 1309 

Cache object: 7cbb447783c4f19b06883151956d94f2


[ 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.