ncp_sock.c

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    1 /*-
    2  * Copyright (c) 1999, 2001 Boris Popov
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * Low level socket routines
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/9.1/sys/netncp/ncp_sock.c 206361 2010-04-07 16:50:38Z joel $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/errno.h>
   34 #include <sys/lock.h>
   35 #include <sys/malloc.h>
   36 #include <sys/mutex.h>
   37 #include <sys/systm.h>
   38 #include <sys/proc.h>
   39 #include <sys/socket.h>
   40 #include <sys/socketvar.h>
   41 #include <sys/protosw.h>
   42 #include <sys/kernel.h>
   43 #include <sys/uio.h>
   44 #include <sys/syslog.h>
   45 #include <sys/mbuf.h>
   46 #include <sys/condvar.h>
   47 #include <net/route.h>
   48 
   49 #include <netipx/ipx.h>
   50 #include <netipx/ipx_pcb.h>
   51 
   52 #include <netncp/ncp.h>
   53 #include <netncp/ncp_conn.h>
   54 #include <netncp/ncp_sock.h>
   55 #include <netncp/ncp_subr.h>
   56 #include <netncp/ncp_rq.h>
   57 
   58 #define ipx_setnullnet(x) ((x).x_net.s_net[0]=0); ((x).x_net.s_net[1]=0);
   59 #define ipx_setnullhost(x) ((x).x_host.s_host[0] = 0); \
   60         ((x).x_host.s_host[1] = 0); ((x).x_host.s_host[2] = 0);
   61 
   62 /*static int ncp_getsockname(struct socket *so, caddr_t asa, int *alen);*/
   63 static int ncp_soconnect(struct socket *so, struct sockaddr *target,
   64                          struct thread *td);
   65 
   66 
   67 /* This will need only if native IP used, or (unlikely) NCP will be
   68  * implemented on the socket level
   69  */
   70 static int
   71 ncp_soconnect(struct socket *so, struct sockaddr *target, struct thread *td)
   72 {
   73         int error, s;
   74 
   75         error = soconnect(so, (struct sockaddr*)target, td);
   76         if (error)
   77                 return error;
   78         /*
   79          * Wait for the connection to complete. Cribbed from the
   80          * connect system call but with the wait timing out so
   81          * that interruptible mounts don't hang here for a long time.
   82          */
   83         error = EIO;
   84         s = splnet();
   85         while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
   86                 (void) tsleep((caddr_t)&so->so_timeo, PSOCK, "ncpcon", 2 * hz);
   87                 if ((so->so_state & SS_ISCONNECTING) &&
   88                     so->so_error == 0 /*&& rep &&*/) {
   89                         so->so_state &= ~SS_ISCONNECTING;
   90                         splx(s);
   91                         goto bad;
   92                 }
   93         }
   94         if (so->so_error) {
   95                 error = so->so_error;
   96                 so->so_error = 0;
   97                 splx(s);
   98                 goto bad;
   99         }
  100                 splx(s);
  101         error=0;
  102 bad:
  103         return error;
  104 }
  105 #ifdef notyet
  106 static int
  107 ncp_getsockname(struct socket *so, caddr_t asa, int *alen) {
  108         struct sockaddr *sa;
  109         int len=0, error;
  110 
  111         sa = 0;
  112         error = (*so->so_proto->pr_usrreqs->pru_sockaddr)(so, &sa);
  113         if (error==0) {
  114                 if (sa) {
  115                         len = min(len, sa->sa_len);
  116                         bcopy(sa, (caddr_t)asa, (u_int)len);
  117                 }
  118                 *alen=len;
  119         }
  120         if (sa)
  121                 free(sa, M_SONAME);
  122         return (error);
  123 }
  124 #endif
  125 int ncp_sock_recv(struct socket *so, struct mbuf **mp, int *rlen)
  126 {
  127         struct uio auio;
  128         struct thread *td = curthread; /* XXX */
  129         int error,flags,len;
  130 
  131         auio.uio_resid = len = 1000000;
  132         auio.uio_td = td;
  133         flags = MSG_DONTWAIT;
  134 
  135 /*      error = soreceive(so, 0, &auio, (struct mbuf **)0, (struct mbuf **)0,
  136             &flags);*/
  137         error = soreceive(so, 0, &auio, mp, (struct mbuf **)0, &flags);
  138         *rlen = len - auio.uio_resid;
  139 /*      if (!error) {
  140             *rlen=iov.iov_len;
  141         } else
  142             *rlen=0;*/
  143 #ifdef NCP_SOCKET_DEBUG
  144         if (error)
  145                 printf("ncp_recv: err=%d\n", error);
  146 #endif
  147         return (error);
  148 }
  149 
  150 int
  151 ncp_sock_send(struct socket *so, struct mbuf *top, struct ncp_rq *rqp)
  152 {
  153         struct thread *td = curthread; /* XXX */
  154         struct sockaddr *to = 0;
  155         struct ncp_conn *conn = rqp->nr_conn;
  156         struct mbuf *m;
  157         int error, flags=0;
  158 
  159         for (;;) {
  160                 m = m_copym(top, 0, M_COPYALL, M_WAIT);
  161 /*              NCPDDEBUG(m);*/
  162                 error = sosend(so, to, 0, m, 0, flags, td);
  163                 if (error == 0 || error == EINTR || error == ENETDOWN)
  164                         break;
  165                 if (rqp->rexmit == 0) break;
  166                 rqp->rexmit--;
  167                 pause("ncprsn", conn->li.timeout * hz);
  168                 error = ncp_chkintr(conn, td);
  169                 if (error == EINTR) break;
  170         }
  171         if (error) {
  172                 log(LOG_INFO, "ncp_send: error %d for server %s", error, conn->li.server);
  173         }
  174         return error;
  175 }
  176 
  177 /*
  178  * Connect to specified server via IPX
  179  */
  180 static int
  181 ncp_sock_connect_ipx(struct ncp_conn *conn)
  182 {
  183         struct sockaddr_ipx sipx;
  184         struct ipxpcb *npcb;
  185         struct thread *td = conn->td;
  186         int addrlen, error, count;
  187 
  188         sipx.sipx_port = htons(0);
  189 
  190         for (count = 0;;count++) {
  191                 if (count > (IPXPORT_WELLKNOWN-IPXPORT_RESERVED)*2) {
  192                         error = EADDRINUSE;
  193                         goto bad;
  194                 }
  195                 conn->ncp_so = conn->wdg_so = NULL;
  196                 checkbad(socreate(AF_IPX, &conn->ncp_so, SOCK_DGRAM, 0, td->td_ucred, td));
  197                 if (conn->li.opt & NCP_OPT_WDOG)
  198                         checkbad(socreate(AF_IPX, &conn->wdg_so, SOCK_DGRAM, 0, td->td_ucred, td));
  199                 addrlen = sizeof(sipx);
  200                 sipx.sipx_family = AF_IPX;
  201                 ipx_setnullnet(sipx.sipx_addr);
  202                 ipx_setnullhost(sipx.sipx_addr);
  203                 sipx.sipx_len = addrlen;
  204                 error = sobind(conn->ncp_so, (struct sockaddr *)&sipx, td);
  205                 if (error == 0) {
  206                         if ((conn->li.opt & NCP_OPT_WDOG) == 0)
  207                                 break;
  208                         sipx.sipx_addr = sotoipxpcb(conn->ncp_so)->ipxp_laddr;
  209                         sipx.sipx_port = htons(ntohs(sipx.sipx_port) + 1);
  210                         ipx_setnullnet(sipx.sipx_addr);
  211                         ipx_setnullhost(sipx.sipx_addr);
  212                         error = sobind(conn->wdg_so, (struct sockaddr *)&sipx, td);
  213                 }
  214                 if (!error) break;
  215                 if (error != EADDRINUSE) goto bad;
  216                 sipx.sipx_port = htons((ntohs(sipx.sipx_port)+4) & 0xfff8);
  217                 soclose(conn->ncp_so);
  218                 if (conn->wdg_so)
  219                         soclose(conn->wdg_so);
  220         }
  221         npcb = sotoipxpcb(conn->ncp_so);
  222         npcb->ipxp_dpt = IPXPROTO_NCP;
  223         /* IPXrouted must be running, i.e. route must be presented */
  224         conn->li.ipxaddr.sipx_len = sizeof(struct sockaddr_ipx);
  225         checkbad(ncp_soconnect(conn->ncp_so, &conn->li.saddr, td));
  226         if (conn->wdg_so) {
  227                 sotoipxpcb(conn->wdg_so)->ipxp_laddr.x_net = npcb->ipxp_laddr.x_net;
  228                 sotoipxpcb(conn->wdg_so)->ipxp_laddr.x_host= npcb->ipxp_laddr.x_host;
  229         }
  230         if (!error) {
  231                 conn->flags |= NCPFL_SOCONN;
  232         }
  233 #ifdef NCPBURST
  234         if (ncp_burst_enabled) {
  235                 checkbad(socreate(AF_IPX, &conn->bc_so, SOCK_DGRAM, 0, td));
  236                 bzero(&sipx, sizeof(sipx));
  237                 sipx.sipx_len = sizeof(sipx);
  238                 checkbad(sobind(conn->bc_so, (struct sockaddr *)&sipx, td));
  239                 checkbad(ncp_soconnect(conn->bc_so, &conn->li.saddr, td));
  240         }
  241 #endif
  242         if (!error) {
  243                 conn->flags |= NCPFL_SOCONN;
  244                 ncp_sock_checksum(conn, 0);
  245         }
  246         return error;
  247 bad:
  248         ncp_sock_disconnect(conn);
  249         return (error);
  250 }
  251 
  252 int
  253 ncp_sock_checksum(struct ncp_conn *conn, int enable)
  254 {
  255 
  256         if (enable) {
  257                 sotoipxpcb(conn->ncp_so)->ipxp_flags |= IPXP_CHECKSUM;
  258         } else {
  259                 sotoipxpcb(conn->ncp_so)->ipxp_flags &= ~IPXP_CHECKSUM;
  260         }
  261         return 0;
  262 }
  263 
  264 /*
  265  * Connect to specified server via IP
  266  */
  267 static int
  268 ncp_sock_connect_in(struct ncp_conn *conn)
  269 {
  270         struct sockaddr_in sin;
  271         struct thread *td = conn->td;
  272         int addrlen = sizeof(sin), error;
  273 
  274         conn->flags = 0;
  275         bzero(&sin,addrlen);
  276         conn->ncp_so = conn->wdg_so = NULL;
  277         checkbad(socreate(AF_INET, &conn->ncp_so, SOCK_DGRAM, IPPROTO_UDP, td->td_ucred, td));
  278         sin.sin_family = AF_INET;
  279         sin.sin_len = addrlen;
  280         checkbad(sobind(conn->ncp_so, (struct sockaddr *)&sin, td));
  281         checkbad(ncp_soconnect(conn->ncp_so,(struct sockaddr*)&conn->li.addr, td));
  282         if  (!error)
  283                 conn->flags |= NCPFL_SOCONN;
  284         return error;
  285 bad:
  286         ncp_sock_disconnect(conn);
  287         return (error);
  288 }
  289 
  290 int
  291 ncp_sock_connect(struct ncp_conn *ncp)
  292 {
  293         int error;
  294 
  295         switch (ncp->li.saddr.sa_family) {
  296             case AF_IPX:
  297                 error = ncp_sock_connect_ipx(ncp);
  298                 break;
  299             case AF_INET:
  300                 error = ncp_sock_connect_in(ncp);
  301                 break;
  302             default:
  303                 return EPROTONOSUPPORT;
  304         }
  305         return error;
  306 }
  307 
  308 /*
  309  * Connection expected to be locked
  310  */
  311 int
  312 ncp_sock_disconnect(struct ncp_conn *conn) {
  313         register struct socket *so;
  314         conn->flags &= ~(NCPFL_SOCONN | NCPFL_ATTACHED | NCPFL_LOGGED);
  315         if (conn->ncp_so) {
  316                 so = conn->ncp_so;
  317                 conn->ncp_so = (struct socket *)0;
  318                 soshutdown(so, 2);
  319                 soclose(so);
  320         }
  321         if (conn->wdg_so) {
  322                 so = conn->wdg_so;
  323                 conn->wdg_so = (struct socket *)0;
  324                 soshutdown(so, 2);
  325                 soclose(so);
  326         }
  327 #ifdef NCPBURST
  328         if (conn->bc_so) {
  329                 so = conn->bc_so;
  330                 conn->bc_so = (struct socket *)NULL;
  331                 soshutdown(so, 2);
  332                 soclose(so);
  333         }
  334 #endif
  335         return 0;
  336 }
  337 
  338 static void
  339 ncp_watchdog(struct ncp_conn *conn) {
  340         char *buf;
  341         struct mbuf *m;
  342         int error, len, flags;
  343         struct socket *so;
  344         struct sockaddr *sa;
  345         struct uio auio;
  346 
  347         sa = NULL;
  348         while (conn->wdg_so) { /* not a loop */
  349                 so = conn->wdg_so;
  350                 auio.uio_resid = len = 1000000;
  351                 auio.uio_td = curthread;
  352                 flags = MSG_DONTWAIT;
  353                 error = soreceive(so, (struct sockaddr**)&sa, &auio, &m,
  354                     (struct mbuf**)0, &flags);
  355                 if (error) break;
  356                 len -= auio.uio_resid;
  357                 NCPSDEBUG("got watch dog %d\n",len);
  358                 if (len != 2) break;
  359                 buf = mtod(m, char*);
  360                 if (buf[1] != '?') break;
  361                 buf[1] = 'Y';
  362                 error = sosend(so, (struct sockaddr*)sa, 0, m, 0, 0, curthread);
  363                 NCPSDEBUG("send watch dog %d\n",error);
  364                 break;
  365         }
  366         if (sa) free(sa, M_SONAME);
  367         return;
  368 }
  369 
  370 void
  371 ncp_check_conn(struct ncp_conn *conn) {
  372         int s;
  373 
  374         if (conn == NULL || !(conn->flags & NCPFL_ATTACHED))
  375                 return;
  376         s = splnet();
  377         ncp_check_rq(conn);
  378         splx(s);
  379         if (conn->li.saddr.sa_family == AF_IPX)
  380                 ncp_watchdog(conn);
  381 }
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FreeBSD/Linux Kernel Cross Reference sys/netncp/ncp_sock.c

FreeBSD/Linux Kernel Cross Reference
sys/netncp/ncp_sock.c
