/* $NetBSD: tp_usrreq.c,v 1.11 1996/06/14 22:22:14 cgd Exp $ */ /*- * Copyright (c) 1991, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)tp_usrreq.c 8.1 (Berkeley) 6/10/93 */ /*********************************************************** Copyright IBM Corporation 1987 All Rights Reserved Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of IBM not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. ******************************************************************/ /* * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison */ /* * tp_usrreq(), the fellow that gets called from most of the socket code. * Pretty straighforward. THe only really awful stuff here is the OOB * processing, which is done wholly here. tp_rcvoob() and tp_sendoob() are * contained here and called by tp_usrreq(). */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include int TNew; int TPNagle1, TPNagle2; struct tp_pcb *tp_listeners, *tp_intercepts; #ifdef ARGO_DEBUG /* * CALLED FROM: * anywhere you want to debug... * FUNCTION and ARGUMENTS: * print (str) followed by the control info in the mbufs of an mbuf chain (n) */ void dump_mbuf(n, str) struct mbuf *n; char *str; { struct mbuf *nextrecord; printf("dump %s\n", str); if (n == MNULL) { printf("EMPTY:\n"); return; } while (n) { nextrecord = n->m_act; printf("RECORD:\n"); while (n) { printf("%p : Len %x Data %p A %p Nx %p Tp %x\n", n, n->m_len, n->m_data, n->m_act, n->m_next, n->m_type); #ifdef notdef { register char *p = mtod(n, char *); register int i; printf("data: "); for (i = 0; i < n->m_len; i++) { if (i % 8 == 0) printf("\n"); printf("0x%x ", *(p + i)); } printf("\n"); } #endif /* notdef */ if (n->m_next == n) { printf("LOOP!\n"); return; } n = n->m_next; } n = nextrecord; } printf("\n"); } #endif /* ARGO_DEBUG */ /* * CALLED FROM: * tp_usrreq(), PRU_RCVOOB * FUNCTION and ARGUMENTS: * Copy data from the expedited data socket buffer into * the pre-allocated mbuf m. * There is an isomorphism between XPD TPDUs and expedited data TSDUs. * XPD tpdus are limited to 16 bytes of data so they fit in one mbuf. * RETURN VALUE: * EINVAL if debugging is on and a disaster has occurred * ENOTCONN if the socket isn't connected * EWOULDBLOCK if the socket is in non-blocking mode and there's no * xpd data in the buffer * E* whatever is returned from the fsm. */ int tp_rcvoob(tpcb, so, m, outflags, inflags) struct tp_pcb *tpcb; register struct socket *so; register struct mbuf *m; int *outflags; int inflags; { register struct mbuf *n; register struct sockbuf *sb = &so->so_rcv; struct tp_event E; int error = 0; register struct mbuf **nn; #ifdef ARGO_DEBUG if (argo_debug[D_XPD]) { printf("PRU_RCVOOB, sostate 0x%x\n", so->so_state); } #endif /* if you use soreceive */ if (m == MNULL) return ENOBUFS; restart: if ((((so->so_state & SS_ISCONNECTED) == 0) || (so->so_state & SS_ISDISCONNECTING) != 0) && (so->so_proto->pr_flags & PR_CONNREQUIRED)) { return ENOTCONN; } /* * Take the first mbuf off the chain. Each XPD TPDU gives you a * complete TSDU so the chains don't get coalesced, but one TSDU may * span several mbufs. Nevertheless, since n should have a most 16 * bytes, it will fit into m. (size was checked in tp_input() ) */ /* * Code for excision of OOB data should be added to * uipc_socket2.c (like sbappend). */ sblock(sb, M_WAITOK); for (nn = &sb->sb_mb; (n = *nn) != NULL; nn = &n->m_act) if (n->m_type == MT_OOBDATA) break; if (n == 0) { #ifdef ARGO_DEBUG if (argo_debug[D_XPD]) { printf("RCVOOB: empty queue!\n"); } #endif sbunlock(sb); if (so->so_state & SS_NBIO) { return EWOULDBLOCK; } sbwait(sb); goto restart; } m->m_len = 0; /* Assuming at most one xpd tpdu is in the buffer at once */ while (n != MNULL) { m->m_len += n->m_len; bcopy(mtod(n, caddr_t), mtod(m, caddr_t), (unsigned) n->m_len); m->m_data += n->m_len; /* so mtod() in bcopy() above gives * right addr */ n = n->m_next; } m->m_data = m->m_dat; m->m_flags |= M_EOR; #ifdef ARGO_DEBUG if (argo_debug[D_XPD]) { printf("tp_rcvoob: xpdlen 0x%x\n", m->m_len); dump_mbuf(so->so_rcv.sb_mb, "RCVOOB: Rcv socketbuf"); dump_mbuf(sb->sb_mb, "RCVOOB: Xrcv socketbuf"); } #endif if ((inflags & MSG_PEEK) == 0) { n = *nn; *nn = n->m_act; for (; n; n = m_free(n)) sbfree(sb, n); } sbunlock(sb); #ifdef TPPT if (tp_traceflags[D_XPD]) { tptraceTPCB(TPPTmisc, "PRU_RCVOOB @ release sb_cc m_len", tpcb->tp_Xrcv.sb_cc, m->m_len, 0, 0); } #endif if (error == 0) error = DoEvent(T_USR_Xrcvd); return error; } /* * CALLED FROM: * tp_usrreq(), PRU_SENDOOB * FUNCTION and ARGUMENTS: * Send what's in the mbuf chain (m) as an XPD TPDU. * The mbuf may not contain more then 16 bytes of data. * XPD TSDUs aren't segmented, so they translate into * exactly one XPD TPDU, with EOT bit set. * RETURN VALUE: * EWOULDBLOCK if socket is in non-blocking mode and the previous * xpd data haven't been acked yet. * EMSGSIZE if trying to send > max-xpd bytes (16) * ENOBUFS if ran out of mbufs */ int tp_sendoob(tpcb, so, xdata, outflags) struct tp_pcb *tpcb; register struct socket *so; register struct mbuf *xdata; int *outflags; /* not used */ { /* * Each mbuf chain represents a sequence # in the XPD seq space. * The first one in the queue has sequence # tp_Xuna. * When we add to the XPD queue, we stuff a zero-length * mbuf (mark) into the DATA queue, with its sequence number in m_next * to be assigned to this XPD tpdu, so data xfer can stop * when it reaches the zero-length mbuf if this XPD TPDU hasn't * yet been acknowledged. */ register struct sockbuf *sb = &(tpcb->tp_Xsnd); register struct mbuf *xmark; register int len = 0; struct tp_event E; #ifdef ARGO_DEBUG if (argo_debug[D_XPD]) { printf("tp_sendoob:"); if (xdata) printf("xdata len 0x%x\n", xdata->m_len); } #endif /* * DO NOT LOCK the Xsnd buffer!!!! You can have at MOST one socket * buf locked at any time!!! (otherwise you might sleep() in sblock() * w/ a signal pending and cause the system call to be aborted w/ a * locked socketbuf, which is a problem. So the so_snd buffer lock * (done in sosend()) serves as the lock for Xpd. */ if (sb->sb_mb) { /* Anything already in eXpedited data * sockbuf? */ if (so->so_state & SS_NBIO) { return EWOULDBLOCK; } while (sb->sb_mb) { sbunlock(&so->so_snd); /* already locked by sosend */ sbwait(&so->so_snd); sblock(&so->so_snd, M_WAITOK); /* sosend will unlock on * return */ } } if (xdata == (struct mbuf *) 0) { /* empty xpd packet */ MGETHDR(xdata, M_WAIT, MT_OOBDATA); xdata->m_len = 0; xdata->m_pkthdr.len = 0; } #ifdef ARGO_DEBUG if (argo_debug[D_XPD]) { printf("tp_sendoob 1:"); if (xdata) printf("xdata len 0x%x\n", xdata->m_len); } #endif xmark = xdata; /* temporary use of variable xmark */ while (xmark) { len += xmark->m_len; xmark = xmark->m_next; } if (len > TP_MAX_XPD_DATA) { return EMSGSIZE; } #ifdef ARGO_DEBUG if (argo_debug[D_XPD]) { printf("tp_sendoob 2:"); if (xdata) printf("xdata len 0x%x\n", len); } #endif #ifdef TPPT if (tp_traceflags[D_XPD]) { tptraceTPCB(TPPTmisc, "XPD mark m_next ", xdata->m_next, 0, 0, 0); } #endif sbappendrecord(sb, xdata); #ifdef ARGO_DEBUG if (argo_debug[D_XPD]) { printf("tp_sendoob len 0x%x\n", len); dump_mbuf(so->so_snd.sb_mb, "XPD request Regular sndbuf:"); dump_mbuf(tpcb->tp_Xsnd.sb_mb, "XPD request Xsndbuf:"); } #endif return DoEvent(T_XPD_req); } /* * CALLED FROM: * the socket routines * FUNCTION and ARGUMENTS: * Handles all "user requests" except the [gs]ockopts() requests. * The argument (req) is the request type (PRU*), * (m) is an mbuf chain, generally used for send and * receive type requests only. * (nam) is used for addresses usually, in particular for the bind request. * */ /* ARGSUSED */ int tp_usrreq(so, req, m, nam, control, p) struct socket *so; int req; struct mbuf *m, *nam, *control; struct proc *p; { register struct tp_pcb *tpcb = sototpcb(so); int s = splsoftnet(); int error = 0; int flags, *outflags = &flags; u_long eotsdu = 0; struct tp_event E; #ifdef ARGO_DEBUG if (argo_debug[D_REQUEST]) { printf("usrreq(%p,%d,%p,%p,%p)\n", so, req, m, nam, outflags); if (so->so_error) printf("WARNING!!! so->so_error is 0x%x\n", so->so_error); } #endif #ifdef TPPT if (tp_traceflags[D_REQUEST]) { tptraceTPCB(TPPTusrreq, "req so m state [", req, so, m, tpcb ? tpcb->tp_state : 0); } #endif if ((u_long) tpcb == 0 && req != PRU_ATTACH) { #ifdef TPPT if (tp_traceflags[D_REQUEST]) { tptraceTPCB(TPPTusrreq, "req failed NO TPCB[", 0, 0, 0, 0); } #endif splx(s); return ENOTCONN; } switch (req) { case PRU_ATTACH: if (tpcb) { error = EISCONN; } else if ((error = tp_attach(so, (long) nam)) == 0) tpcb = sototpcb(so); break; case PRU_ABORT: /* called from close() */ /* * called for each incoming connect queued on the parent * (accepting) socket */ if (tpcb->tp_state == TP_OPEN || tpcb->tp_state == TP_CONFIRMING) { E.TPDU_ATTR(REQ).e_reason = E_TP_NO_SESSION ^ TP_ERROR_MASK; error = DoEvent(T_DISC_req); /* pretend it was a * close() */ break; } /* else DROP THROUGH */ case PRU_DETACH: /* called from close() */ /* called only after disconnect was called */ error = DoEvent(T_DETACH); if (tpcb->tp_state == TP_CLOSED) { if (tpcb->tp_notdetached) { #ifdef ARGO_DEBUG if (argo_debug[D_CONN]) { printf("PRU_DETACH: not detached\n"); } #endif tp_detach(tpcb); } free((caddr_t) tpcb, M_PCB); tpcb = 0; } break; case PRU_SHUTDOWN: /* * recv end may have been released; local credit might be * zero */ case PRU_DISCONNECT: E.TPDU_ATTR(REQ).e_reason = E_TP_NORMAL_DISC ^ TP_ERROR_MASK; error = DoEvent(T_DISC_req); break; case PRU_BIND: error = tp_pcbbind(tpcb, nam, p); break; case PRU_LISTEN: if (tpcb->tp_state != TP_CLOSED || tpcb->tp_lsuffixlen == 0 || tpcb->tp_next == 0) error = EINVAL; else { register struct tp_pcb **tt; remque(tpcb); tpcb->tp_next = tpcb->tp_prev = tpcb; for (tt = &tp_listeners; *tt; tt = &((*tt)->tp_nextlisten)) if ((*tt)->tp_lsuffixlen) break; tpcb->tp_nextlisten = *tt; *tt = tpcb; error = DoEvent(T_LISTEN_req); } break; case PRU_CONNECT2: error = EOPNOTSUPP; /* for unix domain sockets */ break; case PRU_CONNECT: #ifdef TPPT if (tp_traceflags[D_CONN]) { tptraceTPCB(TPPTmisc, "PRU_CONNECT: so 0x%x *SHORT_LSUFXP(tpcb) 0x%x lsuflen 0x%x, class 0x%x", tpcb->tp_sock, *SHORT_LSUFXP(tpcb), tpcb->tp_lsuffixlen, tpcb->tp_class); } #endif #ifdef ARGO_DEBUG if (argo_debug[D_CONN]) { printf("PRU_CONNECT: so %p *SHORT_LSUFXP(tpcb) 0x%x lsuflen 0x%x, class 0x%x", tpcb->tp_sock, *SHORT_LSUFXP(tpcb), tpcb->tp_lsuffixlen, tpcb->tp_class); } #endif if (tpcb->tp_lsuffixlen == 0) { error = tp_pcbbind(tpcb, (struct mbuf *)0, (struct proc *)0); if (error) { #ifdef ARGO_DEBUG if (argo_debug[D_CONN]) { printf("pcbbind returns error 0x%x\n", error); } #endif break; } } #ifdef ARGO_DEBUG if (argo_debug[D_CONN]) { printf("isop %p isop->isop_socket offset 12 :\n", tpcb->tp_npcb); dump_buf(tpcb->tp_npcb, 16); } #endif if ((error = tp_route_to(nam, tpcb, /* channel */ 0)) != 0) break; #ifdef ARGO_DEBUG if (argo_debug[D_CONN]) { printf( "PRU_CONNECT after tpcb %p so %p npcb %p flags 0x%x\n", tpcb, so, tpcb->tp_npcb, tpcb->tp_flags); printf("isop %p isop->isop_socket offset 12 :\n", tpcb->tp_npcb); dump_buf(tpcb->tp_npcb, 16); } #endif if (tpcb->tp_fsuffixlen == 0) { /* didn't set peer extended suffix */ (tpcb->tp_nlproto->nlp_getsufx) (tpcb->tp_npcb, &tpcb->tp_fsuffixlen, tpcb->tp_fsuffix, TP_FOREIGN); } if (tpcb->tp_state == TP_CLOSED) { soisconnecting(so); error = DoEvent(T_CONN_req); } else { (tpcb->tp_nlproto->nlp_pcbdisc) (tpcb->tp_npcb); error = EISCONN; } #ifdef TP_PERF_MEAS if (DOPERF(tpcb)) { u_int lsufx, fsufx; lsufx = *(u_short *) (tpcb->tp_lsuffix); fsufx = *(u_short *) (tpcb->tp_fsuffix); tpmeas(tpcb->tp_lref, TPtime_open | (tpcb->tp_xtd_format << 4), &time, lsufx, fsufx, tpcb->tp_fref); } #endif break; case PRU_ACCEPT: (tpcb->tp_nlproto->nlp_getnetaddr) (tpcb->tp_npcb, nam, TP_FOREIGN); #ifdef ARGO_DEBUG if (argo_debug[D_REQUEST]) { printf("ACCEPT PEERADDDR:"); dump_buf(mtod(nam, char *), nam->m_len); } #endif #ifdef TP_PERF_MEAS if (DOPERF(tpcb)) { u_int lsufx, fsufx; lsufx = *(u_short *) (tpcb->tp_lsuffix); fsufx = *(u_short *) (tpcb->tp_fsuffix); tpmeas(tpcb->tp_lref, TPtime_open, &time, lsufx, fsufx, tpcb->tp_fref); } #endif break; case PRU_RCVD: if (so->so_state & SS_ISCONFIRMING) { if (tpcb->tp_state == TP_CONFIRMING) error = tp_confirm(tpcb); break; } #ifdef TPPT if (tp_traceflags[D_DATA]) { tptraceTPCB(TPPTmisc, "RCVD BF: lcredit sent_lcdt cc hiwat \n", tpcb->tp_lcredit, tpcb->tp_sent_lcdt, so->so_rcv.sb_cc, so->so_rcv.sb_hiwat); LOCAL_CREDIT(tpcb); tptraceTPCB(TPPTmisc, "PRU_RCVD AF sbspace lcredit hiwat cc", sbspace(&so->so_rcv), tpcb->tp_lcredit, so->so_rcv.sb_cc, so->so_rcv.sb_hiwat); } #endif #ifdef ARGO_DEBUG if (argo_debug[D_REQUEST]) { printf("RCVD: cc %ld space %ld hiwat %ld\n", so->so_rcv.sb_cc, sbspace(&so->so_rcv), so->so_rcv.sb_hiwat); } #endif if (((long) nam) & MSG_OOB) error = DoEvent(T_USR_Xrcvd); else error = DoEvent(T_USR_rcvd); break; case PRU_RCVOOB: if ((so->so_state & SS_ISCONNECTED) == 0) { error = ENOTCONN; break; } if (!tpcb->tp_xpd_service) { error = EOPNOTSUPP; break; } /* kludge - nam is really flags here */ error = tp_rcvoob(tpcb, so, m, outflags, (long) nam); break; case PRU_SEND: case PRU_SENDOOB: if (control) { error = tp_snd_control(control, so, &m); control = NULL; if (error) break; } if ((so->so_state & SS_ISCONFIRMING) && (tpcb->tp_state == TP_CONFIRMING) && (error = tp_confirm(tpcb))) break; if (req == PRU_SENDOOB) { error = (tpcb->tp_xpd_service == 0) ? EOPNOTSUPP : tp_sendoob(tpcb, so, m, outflags); break; } if (m == 0) break; if (m->m_flags & M_EOR) { eotsdu = 1; m->m_flags &= ~M_EOR; } if (eotsdu == 0 && m->m_pkthdr.len == 0) break; if (tpcb->tp_state != TP_AKWAIT && tpcb->tp_state != TP_OPEN) { error = ENOTCONN; break; } /* * The protocol machine copies mbuf chains, * prepends headers, assigns seq numbers, and * puts the packets on the device. * When they are acked they are removed from the socket buf. * * sosend calls this up until sbspace goes negative. * Sbspace may be made negative by appending this mbuf chain, * possibly by a whole cluster. */ { /* * Could have eotsdu and no data.(presently MUST have * an mbuf though, even if its length == 0) */ int totlen = m->m_pkthdr.len; struct sockbuf *sb = &so->so_snd; #ifdef TP_PERF_MEAS if (DOPERF(tpcb)) { PStat(tpcb, Nb_from_sess) += totlen; tpmeas(tpcb->tp_lref, TPtime_from_session, 0, 0, PStat(tpcb, Nb_from_sess), totlen); } #endif #ifdef ARGO_DEBUG if (argo_debug[D_SYSCALL]) { printf( "PRU_SEND: eot %ld before sbappend %p len 0x%x to sb @ %p\n", eotsdu, m, totlen, sb); dump_mbuf(sb->sb_mb, "so_snd.sb_mb"); dump_mbuf(m, "m : to be added"); } #endif tp_packetize(tpcb, m, eotsdu); #ifdef ARGO_DEBUG if (argo_debug[D_SYSCALL]) { printf("PRU_SEND: eot %ld after sbappend %p\n", eotsdu, m); dump_mbuf(sb->sb_mb, "so_snd.sb_mb"); } #endif if (tpcb->tp_state == TP_OPEN) error = DoEvent(T_DATA_req); #ifdef ARGO_DEBUG if (argo_debug[D_SYSCALL]) { printf("PRU_SEND: after driver error 0x%x \n", error); printf("so_snd %p cc 0t%ld mbcnt 0t%ld\n", sb, sb->sb_cc, sb->sb_mbcnt); dump_mbuf(sb->sb_mb, "so_snd.sb_mb after driver"); } #endif } break; case PRU_SOCKADDR: (tpcb->tp_nlproto->nlp_getnetaddr) (tpcb->tp_npcb, nam, TP_LOCAL); break; case PRU_PEERADDR: (tpcb->tp_nlproto->nlp_getnetaddr) (tpcb->tp_npcb, nam, TP_FOREIGN); break; case PRU_CONTROL: error = EOPNOTSUPP; break; case PRU_PROTOSEND: case PRU_PROTORCV: case PRU_SENSE: case PRU_SLOWTIMO: case PRU_FASTTIMO: error = EOPNOTSUPP; break; default: #ifdef ARGO_DEBUG printf("tp_usrreq UNKNOWN PRU %d\n", req); #endif /* ARGO_DEBUG */ error = EOPNOTSUPP; } #ifdef ARGO_DEBUG if (argo_debug[D_REQUEST]) { printf("%s, so %p, tpcb %p, error %d, state %d\n", "returning from tp_usrreq", so, tpcb, error, tpcb ? tpcb->tp_state : 0); } #endif #ifdef TPPT if (tp_traceflags[D_REQUEST]) { tptraceTPCB(TPPTusrreq, "END req so m state [", req, so, m, tpcb ? tpcb->tp_state : 0); } #endif if (control) { m_freem(control); printf("control data unexpectedly retained in tp_usrreq()"); } splx(s); return error; } void tp_ltrace(so, uio) struct socket *so; struct uio *uio; { #ifdef TPPT if (tp_traceflags[D_DATA]) { register struct tp_pcb *tpcb = sototpcb(so); if (tpcb) { tptraceTPCB(TPPTmisc, "sosend so resid iovcnt", so, uio->uio_resid, uio->uio_iovcnt, 0); } } #endif } int tp_confirm(tpcb) register struct tp_pcb *tpcb; { struct tp_event E; if (tpcb->tp_state == TP_CONFIRMING) return DoEvent(T_ACPT_req); printf("Tp confirm called when not confirming; tpcb %p, state 0x%x\n", tpcb, tpcb->tp_state); return 0; } /* * Process control data sent with sendmsg() */ int tp_snd_control(m, so, data) struct mbuf *m; struct socket *so; register struct mbuf **data; { register struct cmsghdr *ch; int error = 0; if (m && m->m_len) { ch = mtod(m, struct cmsghdr *); m->m_len -= sizeof(*ch); m->m_data += sizeof(*ch); error = tp_ctloutput(PRCO_SETOPT, so, ch->cmsg_level, ch->cmsg_type, &m); if (ch->cmsg_type == TPOPT_DISC_DATA) { if (data && *data) { m_freem(*data); *data = 0; } error = tp_usrreq(so, PRU_DISCONNECT, (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0); } } if (m) m_freem(m); return error; }