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-rw-r--r--sys/kern/uipc_socket.c1024
1 files changed, 1024 insertions, 0 deletions
diff --git a/sys/kern/uipc_socket.c b/sys/kern/uipc_socket.c
new file mode 100644
index 0000000..ed09ee6
--- /dev/null
+++ b/sys/kern/uipc_socket.c
@@ -0,0 +1,1024 @@
+/*
+ * Copyright (c) 1982, 1986, 1988, 1990, 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.
+ *
+ * @(#)uipc_socket.c 8.3 (Berkeley) 4/15/94
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/file.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/domain.h>
+#include <sys/kernel.h>
+#include <sys/protosw.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/resourcevar.h>
+
+/*
+ * Socket operation routines.
+ * These routines are called by the routines in
+ * sys_socket.c or from a system process, and
+ * implement the semantics of socket operations by
+ * switching out to the protocol specific routines.
+ */
+/*ARGSUSED*/
+socreate(dom, aso, type, proto)
+ int dom;
+ struct socket **aso;
+ register int type;
+ int proto;
+{
+ struct proc *p = curproc; /* XXX */
+ register struct protosw *prp;
+ register struct socket *so;
+ register int error;
+
+ if (proto)
+ prp = pffindproto(dom, proto, type);
+ else
+ prp = pffindtype(dom, type);
+ if (prp == 0 || prp->pr_usrreq == 0)
+ return (EPROTONOSUPPORT);
+ if (prp->pr_type != type)
+ return (EPROTOTYPE);
+ MALLOC(so, struct socket *, sizeof(*so), M_SOCKET, M_WAIT);
+ bzero((caddr_t)so, sizeof(*so));
+ so->so_type = type;
+ if (p->p_ucred->cr_uid == 0)
+ so->so_state = SS_PRIV;
+ so->so_proto = prp;
+ error =
+ (*prp->pr_usrreq)(so, PRU_ATTACH,
+ (struct mbuf *)0, (struct mbuf *)proto, (struct mbuf *)0);
+ if (error) {
+ so->so_state |= SS_NOFDREF;
+ sofree(so);
+ return (error);
+ }
+ *aso = so;
+ return (0);
+}
+
+sobind(so, nam)
+ struct socket *so;
+ struct mbuf *nam;
+{
+ int s = splnet();
+ int error;
+
+ error =
+ (*so->so_proto->pr_usrreq)(so, PRU_BIND,
+ (struct mbuf *)0, nam, (struct mbuf *)0);
+ splx(s);
+ return (error);
+}
+
+solisten(so, backlog)
+ register struct socket *so;
+ int backlog;
+{
+ int s = splnet(), error;
+
+ error =
+ (*so->so_proto->pr_usrreq)(so, PRU_LISTEN,
+ (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0);
+ if (error) {
+ splx(s);
+ return (error);
+ }
+ if (so->so_q == 0)
+ so->so_options |= SO_ACCEPTCONN;
+ if (backlog < 0)
+ backlog = 0;
+ so->so_qlimit = min(backlog, SOMAXCONN);
+ splx(s);
+ return (0);
+}
+
+sofree(so)
+ register struct socket *so;
+{
+
+ if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0)
+ return;
+ if (so->so_head) {
+ if (!soqremque(so, 0) && !soqremque(so, 1))
+ panic("sofree dq");
+ so->so_head = 0;
+ }
+ sbrelease(&so->so_snd);
+ sorflush(so);
+ FREE(so, M_SOCKET);
+}
+
+/*
+ * Close a socket on last file table reference removal.
+ * Initiate disconnect if connected.
+ * Free socket when disconnect complete.
+ */
+soclose(so)
+ register struct socket *so;
+{
+ int s = splnet(); /* conservative */
+ int error = 0;
+
+ if (so->so_options & SO_ACCEPTCONN) {
+ while (so->so_q0)
+ (void) soabort(so->so_q0);
+ while (so->so_q)
+ (void) soabort(so->so_q);
+ }
+ if (so->so_pcb == 0)
+ goto discard;
+ if (so->so_state & SS_ISCONNECTED) {
+ if ((so->so_state & SS_ISDISCONNECTING) == 0) {
+ error = sodisconnect(so);
+ if (error)
+ goto drop;
+ }
+ if (so->so_options & SO_LINGER) {
+ if ((so->so_state & SS_ISDISCONNECTING) &&
+ (so->so_state & SS_NBIO))
+ goto drop;
+ while (so->so_state & SS_ISCONNECTED)
+ if (error = tsleep((caddr_t)&so->so_timeo,
+ PSOCK | PCATCH, netcls, so->so_linger))
+ break;
+ }
+ }
+drop:
+ if (so->so_pcb) {
+ int error2 =
+ (*so->so_proto->pr_usrreq)(so, PRU_DETACH,
+ (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0);
+ if (error == 0)
+ error = error2;
+ }
+discard:
+ if (so->so_state & SS_NOFDREF)
+ panic("soclose: NOFDREF");
+ so->so_state |= SS_NOFDREF;
+ sofree(so);
+ splx(s);
+ return (error);
+}
+
+/*
+ * Must be called at splnet...
+ */
+soabort(so)
+ struct socket *so;
+{
+
+ return (
+ (*so->so_proto->pr_usrreq)(so, PRU_ABORT,
+ (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0));
+}
+
+soaccept(so, nam)
+ register struct socket *so;
+ struct mbuf *nam;
+{
+ int s = splnet();
+ int error;
+
+ if ((so->so_state & SS_NOFDREF) == 0)
+ panic("soaccept: !NOFDREF");
+ so->so_state &= ~SS_NOFDREF;
+ error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT,
+ (struct mbuf *)0, nam, (struct mbuf *)0);
+ splx(s);
+ return (error);
+}
+
+soconnect(so, nam)
+ register struct socket *so;
+ struct mbuf *nam;
+{
+ int s;
+ int error;
+
+ if (so->so_options & SO_ACCEPTCONN)
+ return (EOPNOTSUPP);
+ s = splnet();
+ /*
+ * If protocol is connection-based, can only connect once.
+ * Otherwise, if connected, try to disconnect first.
+ * This allows user to disconnect by connecting to, e.g.,
+ * a null address.
+ */
+ if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
+ ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
+ (error = sodisconnect(so))))
+ error = EISCONN;
+ else
+ error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
+ (struct mbuf *)0, nam, (struct mbuf *)0);
+ splx(s);
+ return (error);
+}
+
+soconnect2(so1, so2)
+ register struct socket *so1;
+ struct socket *so2;
+{
+ int s = splnet();
+ int error;
+
+ error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2,
+ (struct mbuf *)0, (struct mbuf *)so2, (struct mbuf *)0);
+ splx(s);
+ return (error);
+}
+
+sodisconnect(so)
+ register struct socket *so;
+{
+ int s = splnet();
+ int error;
+
+ if ((so->so_state & SS_ISCONNECTED) == 0) {
+ error = ENOTCONN;
+ goto bad;
+ }
+ if (so->so_state & SS_ISDISCONNECTING) {
+ error = EALREADY;
+ goto bad;
+ }
+ error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT,
+ (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0);
+bad:
+ splx(s);
+ return (error);
+}
+
+#define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
+/*
+ * Send on a socket.
+ * If send must go all at once and message is larger than
+ * send buffering, then hard error.
+ * Lock against other senders.
+ * If must go all at once and not enough room now, then
+ * inform user that this would block and do nothing.
+ * Otherwise, if nonblocking, send as much as possible.
+ * The data to be sent is described by "uio" if nonzero,
+ * otherwise by the mbuf chain "top" (which must be null
+ * if uio is not). Data provided in mbuf chain must be small
+ * enough to send all at once.
+ *
+ * Returns nonzero on error, timeout or signal; callers
+ * must check for short counts if EINTR/ERESTART are returned.
+ * Data and control buffers are freed on return.
+ */
+sosend(so, addr, uio, top, control, flags)
+ register struct socket *so;
+ struct mbuf *addr;
+ struct uio *uio;
+ struct mbuf *top;
+ struct mbuf *control;
+ int flags;
+{
+ struct proc *p = curproc; /* XXX */
+ struct mbuf **mp;
+ register struct mbuf *m;
+ register long space, len, resid;
+ int clen = 0, error, s, dontroute, mlen;
+ int atomic = sosendallatonce(so) || top;
+
+ if (uio)
+ resid = uio->uio_resid;
+ else
+ resid = top->m_pkthdr.len;
+ /*
+ * In theory resid should be unsigned.
+ * However, space must be signed, as it might be less than 0
+ * if we over-committed, and we must use a signed comparison
+ * of space and resid. On the other hand, a negative resid
+ * causes us to loop sending 0-length segments to the protocol.
+ */
+ if (resid < 0)
+ return (EINVAL);
+ dontroute =
+ (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
+ (so->so_proto->pr_flags & PR_ATOMIC);
+ p->p_stats->p_ru.ru_msgsnd++;
+ if (control)
+ clen = control->m_len;
+#define snderr(errno) { error = errno; splx(s); goto release; }
+
+restart:
+ if (error = sblock(&so->so_snd, SBLOCKWAIT(flags)))
+ goto out;
+ do {
+ s = splnet();
+ if (so->so_state & SS_CANTSENDMORE)
+ snderr(EPIPE);
+ if (so->so_error)
+ snderr(so->so_error);
+ if ((so->so_state & SS_ISCONNECTED) == 0) {
+ if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
+ if ((so->so_state & SS_ISCONFIRMING) == 0 &&
+ !(resid == 0 && clen != 0))
+ snderr(ENOTCONN);
+ } else if (addr == 0)
+ snderr(EDESTADDRREQ);
+ }
+ space = sbspace(&so->so_snd);
+ if (flags & MSG_OOB)
+ space += 1024;
+ if (atomic && resid > so->so_snd.sb_hiwat ||
+ clen > so->so_snd.sb_hiwat)
+ snderr(EMSGSIZE);
+ if (space < resid + clen && uio &&
+ (atomic || space < so->so_snd.sb_lowat || space < clen)) {
+ if (so->so_state & SS_NBIO)
+ snderr(EWOULDBLOCK);
+ sbunlock(&so->so_snd);
+ error = sbwait(&so->so_snd);
+ splx(s);
+ if (error)
+ goto out;
+ goto restart;
+ }
+ splx(s);
+ mp = &top;
+ space -= clen;
+ do {
+ if (uio == NULL) {
+ /*
+ * Data is prepackaged in "top".
+ */
+ resid = 0;
+ if (flags & MSG_EOR)
+ top->m_flags |= M_EOR;
+ } else do {
+ if (top == 0) {
+ MGETHDR(m, M_WAIT, MT_DATA);
+ mlen = MHLEN;
+ m->m_pkthdr.len = 0;
+ m->m_pkthdr.rcvif = (struct ifnet *)0;
+ } else {
+ MGET(m, M_WAIT, MT_DATA);
+ mlen = MLEN;
+ }
+ if (resid >= MINCLSIZE && space >= MCLBYTES) {
+ MCLGET(m, M_WAIT);
+ if ((m->m_flags & M_EXT) == 0)
+ goto nopages;
+ mlen = MCLBYTES;
+#ifdef MAPPED_MBUFS
+ len = min(MCLBYTES, resid);
+#else
+ if (atomic && top == 0) {
+ len = min(MCLBYTES - max_hdr, resid);
+ m->m_data += max_hdr;
+ } else
+ len = min(MCLBYTES, resid);
+#endif
+ space -= MCLBYTES;
+ } else {
+nopages:
+ len = min(min(mlen, resid), space);
+ space -= len;
+ /*
+ * For datagram protocols, leave room
+ * for protocol headers in first mbuf.
+ */
+ if (atomic && top == 0 && len < mlen)
+ MH_ALIGN(m, len);
+ }
+ error = uiomove(mtod(m, caddr_t), (int)len, uio);
+ resid = uio->uio_resid;
+ m->m_len = len;
+ *mp = m;
+ top->m_pkthdr.len += len;
+ if (error)
+ goto release;
+ mp = &m->m_next;
+ if (resid <= 0) {
+ if (flags & MSG_EOR)
+ top->m_flags |= M_EOR;
+ break;
+ }
+ } while (space > 0 && atomic);
+ if (dontroute)
+ so->so_options |= SO_DONTROUTE;
+ s = splnet(); /* XXX */
+ error = (*so->so_proto->pr_usrreq)(so,
+ (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND,
+ top, addr, control);
+ splx(s);
+ if (dontroute)
+ so->so_options &= ~SO_DONTROUTE;
+ clen = 0;
+ control = 0;
+ top = 0;
+ mp = &top;
+ if (error)
+ goto release;
+ } while (resid && space > 0);
+ } while (resid);
+
+release:
+ sbunlock(&so->so_snd);
+out:
+ if (top)
+ m_freem(top);
+ if (control)
+ m_freem(control);
+ return (error);
+}
+
+/*
+ * Implement receive operations on a socket.
+ * We depend on the way that records are added to the sockbuf
+ * by sbappend*. In particular, each record (mbufs linked through m_next)
+ * must begin with an address if the protocol so specifies,
+ * followed by an optional mbuf or mbufs containing ancillary data,
+ * and then zero or more mbufs of data.
+ * In order to avoid blocking network interrupts for the entire time here,
+ * we splx() while doing the actual copy to user space.
+ * Although the sockbuf is locked, new data may still be appended,
+ * and thus we must maintain consistency of the sockbuf during that time.
+ *
+ * The caller may receive the data as a single mbuf chain by supplying
+ * an mbuf **mp0 for use in returning the chain. The uio is then used
+ * only for the count in uio_resid.
+ */
+soreceive(so, paddr, uio, mp0, controlp, flagsp)
+ register struct socket *so;
+ struct mbuf **paddr;
+ struct uio *uio;
+ struct mbuf **mp0;
+ struct mbuf **controlp;
+ int *flagsp;
+{
+ register struct mbuf *m, **mp;
+ register int flags, len, error, s, offset;
+ struct protosw *pr = so->so_proto;
+ struct mbuf *nextrecord;
+ int moff, type;
+ int orig_resid = uio->uio_resid;
+
+ mp = mp0;
+ if (paddr)
+ *paddr = 0;
+ if (controlp)
+ *controlp = 0;
+ if (flagsp)
+ flags = *flagsp &~ MSG_EOR;
+ else
+ flags = 0;
+ if (flags & MSG_OOB) {
+ m = m_get(M_WAIT, MT_DATA);
+ error = (*pr->pr_usrreq)(so, PRU_RCVOOB,
+ m, (struct mbuf *)(flags & MSG_PEEK), (struct mbuf *)0);
+ if (error)
+ goto bad;
+ do {
+ error = uiomove(mtod(m, caddr_t),
+ (int) min(uio->uio_resid, m->m_len), uio);
+ m = m_free(m);
+ } while (uio->uio_resid && error == 0 && m);
+bad:
+ if (m)
+ m_freem(m);
+ return (error);
+ }
+ if (mp)
+ *mp = (struct mbuf *)0;
+ if (so->so_state & SS_ISCONFIRMING && uio->uio_resid)
+ (*pr->pr_usrreq)(so, PRU_RCVD, (struct mbuf *)0,
+ (struct mbuf *)0, (struct mbuf *)0);
+
+restart:
+ if (error = sblock(&so->so_rcv, SBLOCKWAIT(flags)))
+ return (error);
+ s = splnet();
+
+ m = so->so_rcv.sb_mb;
+ /*
+ * If we have less data than requested, block awaiting more
+ * (subject to any timeout) if:
+ * 1. the current count is less than the low water mark, or
+ * 2. MSG_WAITALL is set, and it is possible to do the entire
+ * receive operation at once if we block (resid <= hiwat).
+ * 3. MSG_DONTWAIT is not set
+ * If MSG_WAITALL is set but resid is larger than the receive buffer,
+ * we have to do the receive in sections, and thus risk returning
+ * a short count if a timeout or signal occurs after we start.
+ */
+ if (m == 0 || ((flags & MSG_DONTWAIT) == 0 &&
+ so->so_rcv.sb_cc < uio->uio_resid) &&
+ (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
+ ((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
+ m->m_nextpkt == 0 && (pr->pr_flags & PR_ATOMIC) == 0) {
+#ifdef DIAGNOSTIC
+ if (m == 0 && so->so_rcv.sb_cc)
+ panic("receive 1");
+#endif
+ if (so->so_error) {
+ if (m)
+ goto dontblock;
+ error = so->so_error;
+ if ((flags & MSG_PEEK) == 0)
+ so->so_error = 0;
+ goto release;
+ }
+ if (so->so_state & SS_CANTRCVMORE) {
+ if (m)
+ goto dontblock;
+ else
+ goto release;
+ }
+ for (; m; m = m->m_next)
+ if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
+ m = so->so_rcv.sb_mb;
+ goto dontblock;
+ }
+ if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
+ (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
+ error = ENOTCONN;
+ goto release;
+ }
+ if (uio->uio_resid == 0)
+ goto release;
+ if ((so->so_state & SS_NBIO) || (flags & MSG_DONTWAIT)) {
+ error = EWOULDBLOCK;
+ goto release;
+ }
+ sbunlock(&so->so_rcv);
+ error = sbwait(&so->so_rcv);
+ splx(s);
+ if (error)
+ return (error);
+ goto restart;
+ }
+dontblock:
+ if (uio->uio_procp)
+ uio->uio_procp->p_stats->p_ru.ru_msgrcv++;
+ nextrecord = m->m_nextpkt;
+ if (pr->pr_flags & PR_ADDR) {
+#ifdef DIAGNOSTIC
+ if (m->m_type != MT_SONAME)
+ panic("receive 1a");
+#endif
+ orig_resid = 0;
+ if (flags & MSG_PEEK) {
+ if (paddr)
+ *paddr = m_copy(m, 0, m->m_len);
+ m = m->m_next;
+ } else {
+ sbfree(&so->so_rcv, m);
+ if (paddr) {
+ *paddr = m;
+ so->so_rcv.sb_mb = m->m_next;
+ m->m_next = 0;
+ m = so->so_rcv.sb_mb;
+ } else {
+ MFREE(m, so->so_rcv.sb_mb);
+ m = so->so_rcv.sb_mb;
+ }
+ }
+ }
+ while (m && m->m_type == MT_CONTROL && error == 0) {
+ if (flags & MSG_PEEK) {
+ if (controlp)
+ *controlp = m_copy(m, 0, m->m_len);
+ m = m->m_next;
+ } else {
+ sbfree(&so->so_rcv, m);
+ if (controlp) {
+ if (pr->pr_domain->dom_externalize &&
+ mtod(m, struct cmsghdr *)->cmsg_type ==
+ SCM_RIGHTS)
+ error = (*pr->pr_domain->dom_externalize)(m);
+ *controlp = m;
+ so->so_rcv.sb_mb = m->m_next;
+ m->m_next = 0;
+ m = so->so_rcv.sb_mb;
+ } else {
+ MFREE(m, so->so_rcv.sb_mb);
+ m = so->so_rcv.sb_mb;
+ }
+ }
+ if (controlp) {
+ orig_resid = 0;
+ controlp = &(*controlp)->m_next;
+ }
+ }
+ if (m) {
+ if ((flags & MSG_PEEK) == 0)
+ m->m_nextpkt = nextrecord;
+ type = m->m_type;
+ if (type == MT_OOBDATA)
+ flags |= MSG_OOB;
+ }
+ moff = 0;
+ offset = 0;
+ while (m && uio->uio_resid > 0 && error == 0) {
+ if (m->m_type == MT_OOBDATA) {
+ if (type != MT_OOBDATA)
+ break;
+ } else if (type == MT_OOBDATA)
+ break;
+#ifdef DIAGNOSTIC
+ else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
+ panic("receive 3");
+#endif
+ so->so_state &= ~SS_RCVATMARK;
+ len = uio->uio_resid;
+ if (so->so_oobmark && len > so->so_oobmark - offset)
+ len = so->so_oobmark - offset;
+ if (len > m->m_len - moff)
+ len = m->m_len - moff;
+ /*
+ * If mp is set, just pass back the mbufs.
+ * Otherwise copy them out via the uio, then free.
+ * Sockbuf must be consistent here (points to current mbuf,
+ * it points to next record) when we drop priority;
+ * we must note any additions to the sockbuf when we
+ * block interrupts again.
+ */
+ if (mp == 0) {
+ splx(s);
+ error = uiomove(mtod(m, caddr_t) + moff, (int)len, uio);
+ s = splnet();
+ } else
+ uio->uio_resid -= len;
+ if (len == m->m_len - moff) {
+ if (m->m_flags & M_EOR)
+ flags |= MSG_EOR;
+ if (flags & MSG_PEEK) {
+ m = m->m_next;
+ moff = 0;
+ } else {
+ nextrecord = m->m_nextpkt;
+ sbfree(&so->so_rcv, m);
+ if (mp) {
+ *mp = m;
+ mp = &m->m_next;
+ so->so_rcv.sb_mb = m = m->m_next;
+ *mp = (struct mbuf *)0;
+ } else {
+ MFREE(m, so->so_rcv.sb_mb);
+ m = so->so_rcv.sb_mb;
+ }
+ if (m)
+ m->m_nextpkt = nextrecord;
+ }
+ } else {
+ if (flags & MSG_PEEK)
+ moff += len;
+ else {
+ if (mp)
+ *mp = m_copym(m, 0, len, M_WAIT);
+ m->m_data += len;
+ m->m_len -= len;
+ so->so_rcv.sb_cc -= len;
+ }
+ }
+ if (so->so_oobmark) {
+ if ((flags & MSG_PEEK) == 0) {
+ so->so_oobmark -= len;
+ if (so->so_oobmark == 0) {
+ so->so_state |= SS_RCVATMARK;
+ break;
+ }
+ } else {
+ offset += len;
+ if (offset == so->so_oobmark)
+ break;
+ }
+ }
+ if (flags & MSG_EOR)
+ break;
+ /*
+ * If the MSG_WAITALL flag is set (for non-atomic socket),
+ * we must not quit until "uio->uio_resid == 0" or an error
+ * termination. If a signal/timeout occurs, return
+ * with a short count but without error.
+ * Keep sockbuf locked against other readers.
+ */
+ while (flags & MSG_WAITALL && m == 0 && uio->uio_resid > 0 &&
+ !sosendallatonce(so) && !nextrecord) {
+ if (so->so_error || so->so_state & SS_CANTRCVMORE)
+ break;
+ error = sbwait(&so->so_rcv);
+ if (error) {
+ sbunlock(&so->so_rcv);
+ splx(s);
+ return (0);
+ }
+ if (m = so->so_rcv.sb_mb)
+ nextrecord = m->m_nextpkt;
+ }
+ }
+
+ if (m && pr->pr_flags & PR_ATOMIC) {
+ flags |= MSG_TRUNC;
+ if ((flags & MSG_PEEK) == 0)
+ (void) sbdroprecord(&so->so_rcv);
+ }
+ if ((flags & MSG_PEEK) == 0) {
+ if (m == 0)
+ so->so_rcv.sb_mb = nextrecord;
+ if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
+ (*pr->pr_usrreq)(so, PRU_RCVD, (struct mbuf *)0,
+ (struct mbuf *)flags, (struct mbuf *)0,
+ (struct mbuf *)0);
+ }
+ if (orig_resid == uio->uio_resid && orig_resid &&
+ (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
+ sbunlock(&so->so_rcv);
+ splx(s);
+ goto restart;
+ }
+
+ if (flagsp)
+ *flagsp |= flags;
+release:
+ sbunlock(&so->so_rcv);
+ splx(s);
+ return (error);
+}
+
+soshutdown(so, how)
+ register struct socket *so;
+ register int how;
+{
+ register struct protosw *pr = so->so_proto;
+
+ how++;
+ if (how & FREAD)
+ sorflush(so);
+ if (how & FWRITE)
+ return ((*pr->pr_usrreq)(so, PRU_SHUTDOWN,
+ (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0));
+ return (0);
+}
+
+sorflush(so)
+ register struct socket *so;
+{
+ register struct sockbuf *sb = &so->so_rcv;
+ register struct protosw *pr = so->so_proto;
+ register int s;
+ struct sockbuf asb;
+
+ sb->sb_flags |= SB_NOINTR;
+ (void) sblock(sb, M_WAITOK);
+ s = splimp();
+ socantrcvmore(so);
+ sbunlock(sb);
+ asb = *sb;
+ bzero((caddr_t)sb, sizeof (*sb));
+ splx(s);
+ if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose)
+ (*pr->pr_domain->dom_dispose)(asb.sb_mb);
+ sbrelease(&asb);
+}
+
+sosetopt(so, level, optname, m0)
+ register struct socket *so;
+ int level, optname;
+ struct mbuf *m0;
+{
+ int error = 0;
+ register struct mbuf *m = m0;
+
+ if (level != SOL_SOCKET) {
+ if (so->so_proto && so->so_proto->pr_ctloutput)
+ return ((*so->so_proto->pr_ctloutput)
+ (PRCO_SETOPT, so, level, optname, &m0));
+ error = ENOPROTOOPT;
+ } else {
+ switch (optname) {
+
+ case SO_LINGER:
+ if (m == NULL || m->m_len != sizeof (struct linger)) {
+ error = EINVAL;
+ goto bad;
+ }
+ so->so_linger = mtod(m, struct linger *)->l_linger;
+ /* fall thru... */
+
+ case SO_DEBUG:
+ case SO_KEEPALIVE:
+ case SO_DONTROUTE:
+ case SO_USELOOPBACK:
+ case SO_BROADCAST:
+ case SO_REUSEADDR:
+ case SO_REUSEPORT:
+ case SO_OOBINLINE:
+ if (m == NULL || m->m_len < sizeof (int)) {
+ error = EINVAL;
+ goto bad;
+ }
+ if (*mtod(m, int *))
+ so->so_options |= optname;
+ else
+ so->so_options &= ~optname;
+ break;
+
+ case SO_SNDBUF:
+ case SO_RCVBUF:
+ case SO_SNDLOWAT:
+ case SO_RCVLOWAT:
+ if (m == NULL || m->m_len < sizeof (int)) {
+ error = EINVAL;
+ goto bad;
+ }
+ switch (optname) {
+
+ case SO_SNDBUF:
+ case SO_RCVBUF:
+ if (sbreserve(optname == SO_SNDBUF ?
+ &so->so_snd : &so->so_rcv,
+ (u_long) *mtod(m, int *)) == 0) {
+ error = ENOBUFS;
+ goto bad;
+ }
+ break;
+
+ case SO_SNDLOWAT:
+ so->so_snd.sb_lowat = *mtod(m, int *);
+ break;
+ case SO_RCVLOWAT:
+ so->so_rcv.sb_lowat = *mtod(m, int *);
+ break;
+ }
+ break;
+
+ case SO_SNDTIMEO:
+ case SO_RCVTIMEO:
+ {
+ struct timeval *tv;
+ short val;
+
+ if (m == NULL || m->m_len < sizeof (*tv)) {
+ error = EINVAL;
+ goto bad;
+ }
+ tv = mtod(m, struct timeval *);
+ if (tv->tv_sec > SHRT_MAX / hz - hz) {
+ error = EDOM;
+ goto bad;
+ }
+ val = tv->tv_sec * hz + tv->tv_usec / tick;
+
+ switch (optname) {
+
+ case SO_SNDTIMEO:
+ so->so_snd.sb_timeo = val;
+ break;
+ case SO_RCVTIMEO:
+ so->so_rcv.sb_timeo = val;
+ break;
+ }
+ break;
+ }
+
+ default:
+ error = ENOPROTOOPT;
+ break;
+ }
+ if (error == 0 && so->so_proto && so->so_proto->pr_ctloutput) {
+ (void) ((*so->so_proto->pr_ctloutput)
+ (PRCO_SETOPT, so, level, optname, &m0));
+ m = NULL; /* freed by protocol */
+ }
+ }
+bad:
+ if (m)
+ (void) m_free(m);
+ return (error);
+}
+
+sogetopt(so, level, optname, mp)
+ register struct socket *so;
+ int level, optname;
+ struct mbuf **mp;
+{
+ register struct mbuf *m;
+
+ if (level != SOL_SOCKET) {
+ if (so->so_proto && so->so_proto->pr_ctloutput) {
+ return ((*so->so_proto->pr_ctloutput)
+ (PRCO_GETOPT, so, level, optname, mp));
+ } else
+ return (ENOPROTOOPT);
+ } else {
+ m = m_get(M_WAIT, MT_SOOPTS);
+ m->m_len = sizeof (int);
+
+ switch (optname) {
+
+ case SO_LINGER:
+ m->m_len = sizeof (struct linger);
+ mtod(m, struct linger *)->l_onoff =
+ so->so_options & SO_LINGER;
+ mtod(m, struct linger *)->l_linger = so->so_linger;
+ break;
+
+ case SO_USELOOPBACK:
+ case SO_DONTROUTE:
+ case SO_DEBUG:
+ case SO_KEEPALIVE:
+ case SO_REUSEADDR:
+ case SO_REUSEPORT:
+ case SO_BROADCAST:
+ case SO_OOBINLINE:
+ *mtod(m, int *) = so->so_options & optname;
+ break;
+
+ case SO_TYPE:
+ *mtod(m, int *) = so->so_type;
+ break;
+
+ case SO_ERROR:
+ *mtod(m, int *) = so->so_error;
+ so->so_error = 0;
+ break;
+
+ case SO_SNDBUF:
+ *mtod(m, int *) = so->so_snd.sb_hiwat;
+ break;
+
+ case SO_RCVBUF:
+ *mtod(m, int *) = so->so_rcv.sb_hiwat;
+ break;
+
+ case SO_SNDLOWAT:
+ *mtod(m, int *) = so->so_snd.sb_lowat;
+ break;
+
+ case SO_RCVLOWAT:
+ *mtod(m, int *) = so->so_rcv.sb_lowat;
+ break;
+
+ case SO_SNDTIMEO:
+ case SO_RCVTIMEO:
+ {
+ int val = (optname == SO_SNDTIMEO ?
+ so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
+
+ m->m_len = sizeof(struct timeval);
+ mtod(m, struct timeval *)->tv_sec = val / hz;
+ mtod(m, struct timeval *)->tv_usec =
+ (val % hz) / tick;
+ break;
+ }
+
+ default:
+ (void)m_free(m);
+ return (ENOPROTOOPT);
+ }
+ *mp = m;
+ return (0);
+ }
+}
+
+sohasoutofband(so)
+ register struct socket *so;
+{
+ struct proc *p;
+
+ if (so->so_pgid < 0)
+ gsignal(-so->so_pgid, SIGURG);
+ else if (so->so_pgid > 0 && (p = pfind(so->so_pgid)) != 0)
+ psignal(p, SIGURG);
+ selwakeup(&so->so_rcv.sb_sel);
+}
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