svc_dg.c

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    1 /*      $NetBSD: svc_dg.c,v 1.4 2000/07/06 03:10:35 christos Exp $      */
    2 
    3 /*-
    4  * Copyright (c) 2009, Sun Microsystems, Inc.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without 
    8  * modification, are permitted provided that the following conditions are met:
    9  * - Redistributions of source code must retain the above copyright notice, 
   10  *   this list of conditions and the following disclaimer.
   11  * - Redistributions in binary form must reproduce the above copyright notice, 
   12  *   this list of conditions and the following disclaimer in the documentation 
   13  *   and/or other materials provided with the distribution.
   14  * - Neither the name of Sun Microsystems, Inc. nor the names of its 
   15  *   contributors may be used to endorse or promote products derived 
   16  *   from this software without specific prior written permission.
   17  * 
   18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
   19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
   21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 
   22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
   23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
   24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
   25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
   26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
   27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
   28  * POSSIBILITY OF SUCH DAMAGE.
   29  */
   30 
   31 /*
   32  * Copyright (c) 1986-1991 by Sun Microsystems Inc.
   33  */
   34 
   35 #if defined(LIBC_SCCS) && !defined(lint)
   36 #ident  "@(#)svc_dg.c   1.17    94/04/24 SMI"
   37 #endif
   38 #include <sys/cdefs.h>
   39 __FBSDID("$FreeBSD: releng/11.2/sys/rpc/svc_dg.c 331722 2018-03-29 02:50:57Z eadler $");
   40 
   41 /*
   42  * svc_dg.c, Server side for connectionless RPC.
   43  */
   44 
   45 #include <sys/param.h>
   46 #include <sys/lock.h>
   47 #include <sys/kernel.h>
   48 #include <sys/malloc.h>
   49 #include <sys/mbuf.h>
   50 #include <sys/mutex.h>
   51 #include <sys/protosw.h>
   52 #include <sys/queue.h>
   53 #include <sys/socket.h>
   54 #include <sys/socketvar.h>
   55 #include <sys/sx.h>
   56 #include <sys/systm.h>
   57 #include <sys/uio.h>
   58 
   59 #include <net/vnet.h>
   60 
   61 #include <rpc/rpc.h>
   62 
   63 #include <rpc/rpc_com.h>
   64 
   65 static enum xprt_stat svc_dg_stat(SVCXPRT *);
   66 static bool_t svc_dg_recv(SVCXPRT *, struct rpc_msg *,
   67     struct sockaddr **, struct mbuf **);
   68 static bool_t svc_dg_reply(SVCXPRT *, struct rpc_msg *,
   69     struct sockaddr *, struct mbuf *, uint32_t *);
   70 static void svc_dg_destroy(SVCXPRT *);
   71 static bool_t svc_dg_control(SVCXPRT *, const u_int, void *);
   72 static int svc_dg_soupcall(struct socket *so, void *arg, int waitflag);
   73 
   74 static struct xp_ops svc_dg_ops = {
   75         .xp_recv =      svc_dg_recv,
   76         .xp_stat =      svc_dg_stat,
   77         .xp_reply =     svc_dg_reply,
   78         .xp_destroy =   svc_dg_destroy,
   79         .xp_control =   svc_dg_control,
   80 };
   81 
   82 /*
   83  * Usage:
   84  *      xprt = svc_dg_create(sock, sendsize, recvsize);
   85  * Does other connectionless specific initializations.
   86  * Once *xprt is initialized, it is registered.
   87  * see (svc.h, xprt_register). If recvsize or sendsize are 0 suitable
   88  * system defaults are chosen.
   89  * The routines returns NULL if a problem occurred.
   90  */
   91 static const char svc_dg_str[] = "svc_dg_create: %s";
   92 static const char svc_dg_err1[] = "could not get transport information";
   93 static const char svc_dg_err2[] = "transport does not support data transfer";
   94 static const char __no_mem_str[] = "out of memory";
   95 
   96 SVCXPRT *
   97 svc_dg_create(SVCPOOL *pool, struct socket *so, size_t sendsize,
   98     size_t recvsize)
   99 {
  100         SVCXPRT *xprt;
  101         struct __rpc_sockinfo si;
  102         struct sockaddr* sa;
  103         int error;
  104 
  105         if (!__rpc_socket2sockinfo(so, &si)) {
  106                 printf(svc_dg_str, svc_dg_err1);
  107                 return (NULL);
  108         }
  109         /*
  110          * Find the receive and the send size
  111          */
  112         sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize);
  113         recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize);
  114         if ((sendsize == 0) || (recvsize == 0)) {
  115                 printf(svc_dg_str, svc_dg_err2);
  116                 return (NULL);
  117         }
  118 
  119         xprt = svc_xprt_alloc();
  120         sx_init(&xprt->xp_lock, "xprt->xp_lock");
  121         xprt->xp_pool = pool;
  122         xprt->xp_socket = so;
  123         xprt->xp_p1 = NULL;
  124         xprt->xp_p2 = NULL;
  125         xprt->xp_ops = &svc_dg_ops;
  126 
  127         CURVNET_SET(so->so_vnet);
  128         error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
  129         CURVNET_RESTORE();
  130         if (error)
  131                 goto freedata;
  132 
  133         memcpy(&xprt->xp_ltaddr, sa, sa->sa_len);
  134         free(sa, M_SONAME);
  135 
  136         xprt_register(xprt);
  137 
  138         SOCKBUF_LOCK(&so->so_rcv);
  139         soupcall_set(so, SO_RCV, svc_dg_soupcall, xprt);
  140         SOCKBUF_UNLOCK(&so->so_rcv);
  141 
  142         return (xprt);
  143 freedata:
  144         (void) printf(svc_dg_str, __no_mem_str);
  145         svc_xprt_free(xprt);
  146 
  147         return (NULL);
  148 }
  149 
  150 /*ARGSUSED*/
  151 static enum xprt_stat
  152 svc_dg_stat(SVCXPRT *xprt)
  153 {
  154 
  155         if (soreadable(xprt->xp_socket))
  156                 return (XPRT_MOREREQS);
  157 
  158         return (XPRT_IDLE);
  159 }
  160 
  161 static bool_t
  162 svc_dg_recv(SVCXPRT *xprt, struct rpc_msg *msg,
  163     struct sockaddr **addrp, struct mbuf **mp)
  164 {
  165         struct uio uio;
  166         struct sockaddr *raddr;
  167         struct mbuf *mreq;
  168         XDR xdrs;
  169         int error, rcvflag;
  170 
  171         /*
  172          * Serialise access to the socket.
  173          */
  174         sx_xlock(&xprt->xp_lock);
  175 
  176         /*
  177          * The socket upcall calls xprt_active() which will eventually
  178          * cause the server to call us here. We attempt to read a
  179          * packet from the socket and process it. If the read fails,
  180          * we have drained all pending requests so we call
  181          * xprt_inactive().
  182          */
  183         uio.uio_resid = 1000000000;
  184         uio.uio_td = curthread;
  185         mreq = NULL;
  186         rcvflag = MSG_DONTWAIT;
  187         error = soreceive(xprt->xp_socket, &raddr, &uio, &mreq, NULL, &rcvflag);
  188 
  189         if (error == EWOULDBLOCK) {
  190                 /*
  191                  * We must re-test for readability after taking the
  192                  * lock to protect us in the case where a new packet
  193                  * arrives on the socket after our call to soreceive
  194                  * fails with EWOULDBLOCK. The pool lock protects us
  195                  * from racing the upcall after our soreadable() call
  196                  * returns false.
  197                  */
  198                 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
  199                 if (!soreadable(xprt->xp_socket))
  200                         xprt_inactive_self(xprt);
  201                 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
  202                 sx_xunlock(&xprt->xp_lock);
  203                 return (FALSE);
  204         }
  205 
  206         if (error) {
  207                 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
  208                 soupcall_clear(xprt->xp_socket, SO_RCV);
  209                 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
  210                 xprt_inactive_self(xprt);
  211                 sx_xunlock(&xprt->xp_lock);
  212                 return (FALSE);
  213         }
  214 
  215         sx_xunlock(&xprt->xp_lock);
  216 
  217         xdrmbuf_create(&xdrs, mreq, XDR_DECODE);
  218         if (! xdr_callmsg(&xdrs, msg)) {
  219                 XDR_DESTROY(&xdrs);
  220                 return (FALSE);
  221         }
  222 
  223         *addrp = raddr;
  224         *mp = xdrmbuf_getall(&xdrs);
  225         XDR_DESTROY(&xdrs);
  226 
  227         return (TRUE);
  228 }
  229 
  230 static bool_t
  231 svc_dg_reply(SVCXPRT *xprt, struct rpc_msg *msg,
  232     struct sockaddr *addr, struct mbuf *m, uint32_t *seq)
  233 {
  234         XDR xdrs;
  235         struct mbuf *mrep;
  236         bool_t stat = TRUE;
  237         int error;
  238 
  239         mrep = m_gethdr(M_WAITOK, MT_DATA);
  240 
  241         xdrmbuf_create(&xdrs, mrep, XDR_ENCODE);
  242 
  243         if (msg->rm_reply.rp_stat == MSG_ACCEPTED &&
  244             msg->rm_reply.rp_acpt.ar_stat == SUCCESS) {
  245                 if (!xdr_replymsg(&xdrs, msg))
  246                         stat = FALSE;
  247                 else
  248                         xdrmbuf_append(&xdrs, m);
  249         } else {
  250                 stat = xdr_replymsg(&xdrs, msg);
  251         }
  252 
  253         if (stat) {
  254                 m_fixhdr(mrep);
  255                 error = sosend(xprt->xp_socket, addr, NULL, mrep, NULL,
  256                     0, curthread);
  257                 if (!error) {
  258                         stat = TRUE;
  259                 }
  260         } else {
  261                 m_freem(mrep);
  262         }
  263 
  264         XDR_DESTROY(&xdrs);
  265         xprt->xp_p2 = NULL;
  266 
  267         return (stat);
  268 }
  269 
  270 static void
  271 svc_dg_destroy(SVCXPRT *xprt)
  272 {
  273 
  274         SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
  275         soupcall_clear(xprt->xp_socket, SO_RCV);
  276         SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
  277 
  278         sx_destroy(&xprt->xp_lock);
  279         if (xprt->xp_socket)
  280                 (void)soclose(xprt->xp_socket);
  281 
  282         if (xprt->xp_netid)
  283                 (void) mem_free(xprt->xp_netid, strlen(xprt->xp_netid) + 1);
  284         svc_xprt_free(xprt);
  285 }
  286 
  287 static bool_t
  288 /*ARGSUSED*/
  289 svc_dg_control(xprt, rq, in)
  290         SVCXPRT *xprt;
  291         const u_int     rq;
  292         void            *in;
  293 {
  294 
  295         return (FALSE);
  296 }
  297 
  298 static int
  299 svc_dg_soupcall(struct socket *so, void *arg, int waitflag)
  300 {
  301         SVCXPRT *xprt = (SVCXPRT *) arg;
  302 
  303         xprt_active(xprt);
  304         return (SU_OK);
  305 }
Cache object: 75b07f69f2b3374d9f82fb42af8ad812
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FreeBSD/Linux Kernel Cross Reference sys/rpc/svc_dg.c

FreeBSD/Linux Kernel Cross Reference
sys/rpc/svc_dg.c
