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-rw-r--r--sys/kern/uipc_socket.c1792
1 files changed, 1792 insertions, 0 deletions
diff --git a/sys/kern/uipc_socket.c b/sys/kern/uipc_socket.c
new file mode 100644
index 0000000..d596294
--- /dev/null
+++ b/sys/kern/uipc_socket.c
@@ -0,0 +1,1792 @@
+/*
+ * 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
+ * $FreeBSD$
+ */
+
+#include "opt_inet.h"
+#include "opt_zero.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/fcntl.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/mutex.h>
+#include <sys/domain.h>
+#include <sys/file.h> /* for struct knote */
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/event.h>
+#include <sys/poll.h>
+#include <sys/proc.h>
+#include <sys/protosw.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/resourcevar.h>
+#include <sys/signalvar.h>
+#include <sys/sysctl.h>
+#include <sys/uio.h>
+#include <sys/jail.h>
+
+#include <vm/uma.h>
+
+#include <machine/limits.h>
+
+#ifdef INET
+static int do_setopt_accept_filter(struct socket *so, struct sockopt *sopt);
+#endif
+
+static void filt_sordetach(struct knote *kn);
+static int filt_soread(struct knote *kn, long hint);
+static void filt_sowdetach(struct knote *kn);
+static int filt_sowrite(struct knote *kn, long hint);
+static int filt_solisten(struct knote *kn, long hint);
+
+static struct filterops solisten_filtops =
+ { 1, NULL, filt_sordetach, filt_solisten };
+static struct filterops soread_filtops =
+ { 1, NULL, filt_sordetach, filt_soread };
+static struct filterops sowrite_filtops =
+ { 1, NULL, filt_sowdetach, filt_sowrite };
+
+uma_zone_t socket_zone;
+so_gen_t so_gencnt; /* generation count for sockets */
+
+MALLOC_DEFINE(M_SONAME, "soname", "socket name");
+MALLOC_DEFINE(M_PCB, "pcb", "protocol control block");
+
+SYSCTL_DECL(_kern_ipc);
+
+static int somaxconn = SOMAXCONN;
+SYSCTL_INT(_kern_ipc, KIPC_SOMAXCONN, somaxconn, CTLFLAG_RW,
+ &somaxconn, 0, "Maximum pending socket connection queue size");
+static int numopensockets;
+SYSCTL_INT(_kern_ipc, OID_AUTO, numopensockets, CTLFLAG_RD,
+ &numopensockets, 0, "Number of open sockets");
+#ifdef ZERO_COPY_SOCKETS
+/* These aren't static because they're used in other files. */
+int so_zero_copy_send = 1;
+int so_zero_copy_receive = 1;
+SYSCTL_NODE(_kern_ipc, OID_AUTO, zero_copy, CTLFLAG_RD, 0,
+ "Zero copy controls");
+SYSCTL_INT(_kern_ipc_zero_copy, OID_AUTO, receive, CTLFLAG_RW,
+ &so_zero_copy_receive, 0, "Enable zero copy receive");
+SYSCTL_INT(_kern_ipc_zero_copy, OID_AUTO, send, CTLFLAG_RW,
+ &so_zero_copy_send, 0, "Enable zero copy send");
+#endif /* ZERO_COPY_SOCKETS */
+
+
+/*
+ * 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.
+ */
+
+/*
+ * Get a socket structure from our zone, and initialize it.
+ * Note that it would probably be better to allocate socket
+ * and PCB at the same time, but I'm not convinced that all
+ * the protocols can be easily modified to do this.
+ *
+ * soalloc() returns a socket with a ref count of 0.
+ */
+struct socket *
+soalloc(waitok)
+ int waitok;
+{
+ struct socket *so;
+ int flag;
+
+ if (waitok == 1)
+ flag = M_WAITOK;
+ else
+ flag = M_NOWAIT;
+ flag |= M_ZERO;
+ so = uma_zalloc(socket_zone, flag);
+ if (so) {
+ /* XXX race condition for reentrant kernel */
+ so->so_gencnt = ++so_gencnt;
+ /* sx_init(&so->so_sxlock, "socket sxlock"); */
+ TAILQ_INIT(&so->so_aiojobq);
+ ++numopensockets;
+ }
+ return so;
+}
+
+/*
+ * socreate returns a socket with a ref count of 1. The socket should be
+ * closed with soclose().
+ */
+int
+socreate(dom, aso, type, proto, cred, td)
+ int dom;
+ struct socket **aso;
+ register int type;
+ int proto;
+ struct ucred *cred;
+ struct thread *td;
+{
+ 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_usrreqs->pru_attach == 0)
+ return (EPROTONOSUPPORT);
+
+ if (jailed(td->td_ucred) && jail_socket_unixiproute_only &&
+ prp->pr_domain->dom_family != PF_LOCAL &&
+ prp->pr_domain->dom_family != PF_INET &&
+ prp->pr_domain->dom_family != PF_ROUTE) {
+ return (EPROTONOSUPPORT);
+ }
+
+ if (prp->pr_type != type)
+ return (EPROTOTYPE);
+ so = soalloc(M_NOWAIT);
+ if (so == NULL)
+ return (ENOBUFS);
+
+ TAILQ_INIT(&so->so_incomp);
+ TAILQ_INIT(&so->so_comp);
+ so->so_type = type;
+ so->so_cred = crhold(cred);
+ so->so_proto = prp;
+ soref(so);
+ error = (*prp->pr_usrreqs->pru_attach)(so, proto, td);
+ if (error) {
+ so->so_state |= SS_NOFDREF;
+ sorele(so);
+ return (error);
+ }
+ *aso = so;
+ return (0);
+}
+
+int
+sobind(so, nam, td)
+ struct socket *so;
+ struct sockaddr *nam;
+ struct thread *td;
+{
+ int s = splnet();
+ int error;
+
+ error = (*so->so_proto->pr_usrreqs->pru_bind)(so, nam, td);
+ splx(s);
+ return (error);
+}
+
+static void
+sodealloc(struct socket *so)
+{
+
+ KASSERT(so->so_count == 0, ("sodealloc(): so_count %d", so->so_count));
+ so->so_gencnt = ++so_gencnt;
+ if (so->so_rcv.sb_hiwat)
+ (void)chgsbsize(so->so_cred->cr_uidinfo,
+ &so->so_rcv.sb_hiwat, 0, RLIM_INFINITY);
+ if (so->so_snd.sb_hiwat)
+ (void)chgsbsize(so->so_cred->cr_uidinfo,
+ &so->so_snd.sb_hiwat, 0, RLIM_INFINITY);
+#ifdef INET
+ if (so->so_accf != NULL) {
+ if (so->so_accf->so_accept_filter != NULL &&
+ so->so_accf->so_accept_filter->accf_destroy != NULL) {
+ so->so_accf->so_accept_filter->accf_destroy(so);
+ }
+ if (so->so_accf->so_accept_filter_str != NULL)
+ FREE(so->so_accf->so_accept_filter_str, M_ACCF);
+ FREE(so->so_accf, M_ACCF);
+ }
+#endif
+ crfree(so->so_cred);
+ /* sx_destroy(&so->so_sxlock); */
+ uma_zfree(socket_zone, so);
+ --numopensockets;
+}
+
+int
+solisten(so, backlog, td)
+ register struct socket *so;
+ int backlog;
+ struct thread *td;
+{
+ int s, error;
+
+ s = splnet();
+ error = (*so->so_proto->pr_usrreqs->pru_listen)(so, td);
+ if (error) {
+ splx(s);
+ return (error);
+ }
+ if (TAILQ_EMPTY(&so->so_comp))
+ so->so_options |= SO_ACCEPTCONN;
+ if (backlog < 0 || backlog > somaxconn)
+ backlog = somaxconn;
+ so->so_qlimit = backlog;
+ splx(s);
+ return (0);
+}
+
+void
+sofree(so)
+ register struct socket *so;
+{
+ struct socket *head = so->so_head;
+
+ KASSERT(so->so_count == 0, ("socket %p so_count not 0", so));
+
+ if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0)
+ return;
+ if (head != NULL) {
+ if (so->so_state & SS_INCOMP) {
+ TAILQ_REMOVE(&head->so_incomp, so, so_list);
+ head->so_incqlen--;
+ } else if (so->so_state & SS_COMP) {
+ /*
+ * We must not decommission a socket that's
+ * on the accept(2) queue. If we do, then
+ * accept(2) may hang after select(2) indicated
+ * that the listening socket was ready.
+ */
+ return;
+ } else {
+ panic("sofree: not queued");
+ }
+ so->so_state &= ~SS_INCOMP;
+ so->so_head = NULL;
+ }
+ sbrelease(&so->so_snd, so);
+ sorflush(so);
+ sodealloc(so);
+}
+
+/*
+ * Close a socket on last file table reference removal.
+ * Initiate disconnect if connected.
+ * Free socket when disconnect complete.
+ *
+ * This function will sorele() the socket. Note that soclose() may be
+ * called prior to the ref count reaching zero. The actual socket
+ * structure will not be freed until the ref count reaches zero.
+ */
+int
+soclose(so)
+ register struct socket *so;
+{
+ int s = splnet(); /* conservative */
+ int error = 0;
+
+ funsetown(&so->so_sigio);
+ if (so->so_options & SO_ACCEPTCONN) {
+ struct socket *sp, *sonext;
+
+ sp = TAILQ_FIRST(&so->so_incomp);
+ for (; sp != NULL; sp = sonext) {
+ sonext = TAILQ_NEXT(sp, so_list);
+ (void) soabort(sp);
+ }
+ for (sp = TAILQ_FIRST(&so->so_comp); sp != NULL; sp = sonext) {
+ sonext = TAILQ_NEXT(sp, so_list);
+ /* Dequeue from so_comp since sofree() won't do it */
+ TAILQ_REMOVE(&so->so_comp, sp, so_list);
+ so->so_qlen--;
+ sp->so_state &= ~SS_COMP;
+ sp->so_head = NULL;
+ (void) soabort(sp);
+ }
+ }
+ 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) {
+ error = tsleep(&so->so_timeo,
+ PSOCK | PCATCH, "soclos", so->so_linger * hz);
+ if (error)
+ break;
+ }
+ }
+ }
+drop:
+ if (so->so_pcb) {
+ int error2 = (*so->so_proto->pr_usrreqs->pru_detach)(so);
+ if (error == 0)
+ error = error2;
+ }
+discard:
+ if (so->so_state & SS_NOFDREF)
+ panic("soclose: NOFDREF");
+ so->so_state |= SS_NOFDREF;
+ sorele(so);
+ splx(s);
+ return (error);
+}
+
+/*
+ * Must be called at splnet...
+ */
+int
+soabort(so)
+ struct socket *so;
+{
+ int error;
+
+ error = (*so->so_proto->pr_usrreqs->pru_abort)(so);
+ if (error) {
+ sotryfree(so); /* note: does not decrement the ref count */
+ return error;
+ }
+ return (0);
+}
+
+int
+soaccept(so, nam)
+ register struct socket *so;
+ struct sockaddr **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_usrreqs->pru_accept)(so, nam);
+ splx(s);
+ return (error);
+}
+
+int
+soconnect(so, nam, td)
+ register struct socket *so;
+ struct sockaddr *nam;
+ struct thread *td;
+{
+ 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_usrreqs->pru_connect)(so, nam, td);
+ splx(s);
+ return (error);
+}
+
+int
+soconnect2(so1, so2)
+ register struct socket *so1;
+ struct socket *so2;
+{
+ int s = splnet();
+ int error;
+
+ error = (*so1->so_proto->pr_usrreqs->pru_connect2)(so1, so2);
+ splx(s);
+ return (error);
+}
+
+int
+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_usrreqs->pru_disconnect)(so);
+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.
+ */
+
+#ifdef ZERO_COPY_SOCKETS
+struct so_zerocopy_stats{
+ int size_ok;
+ int align_ok;
+ int found_ifp;
+};
+struct so_zerocopy_stats so_zerocp_stats = {0,0,0};
+#include <netinet/in.h>
+#include <net/route.h>
+#include <netinet/in_pcb.h>
+#include <vm/vm.h>
+#include <vm/vm_page.h>
+#include <vm/vm_object.h>
+#endif /*ZERO_COPY_SOCKETS*/
+
+int
+sosend(so, addr, uio, top, control, flags, td)
+ register struct socket *so;
+ struct sockaddr *addr;
+ struct uio *uio;
+ struct mbuf *top;
+ struct mbuf *control;
+ int flags;
+ struct thread *td;
+{
+ struct mbuf **mp;
+ register struct mbuf *m;
+ register long space, len, resid;
+ int clen = 0, error, s, dontroute, mlen;
+ int atomic = sosendallatonce(so) || top;
+#ifdef ZERO_COPY_SOCKETS
+ int cow_send;
+#endif /* ZERO_COPY_SOCKETS */
+
+ 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.
+ *
+ * Also check to make sure that MSG_EOR isn't used on SOCK_STREAM
+ * type sockets since that's an error.
+ */
+ if (resid < 0 || (so->so_type == SOCK_STREAM && (flags & MSG_EOR))) {
+ error = EINVAL;
+ goto out;
+ }
+
+ dontroute =
+ (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
+ (so->so_proto->pr_flags & PR_ATOMIC);
+ if (td)
+ td->td_proc->p_stats->p_ru.ru_msgsnd++;
+ if (control)
+ clen = control->m_len;
+#define snderr(errno) { error = errno; splx(s); goto release; }
+
+restart:
+ error = sblock(&so->so_snd, SBLOCKWAIT(flags));
+ if (error)
+ goto out;
+ do {
+ s = splnet();
+ if (so->so_state & SS_CANTSENDMORE)
+ snderr(EPIPE);
+ if (so->so_error) {
+ error = so->so_error;
+ so->so_error = 0;
+ splx(s);
+ goto release;
+ }
+ if ((so->so_state & SS_ISCONNECTED) == 0) {
+ /*
+ * `sendto' and `sendmsg' is allowed on a connection-
+ * based socket if it supports implied connect.
+ * Return ENOTCONN if not connected and no address is
+ * supplied.
+ */
+ if ((so->so_proto->pr_flags & PR_CONNREQUIRED) &&
+ (so->so_proto->pr_flags & PR_IMPLOPCL) == 0) {
+ if ((so->so_state & SS_ISCONFIRMING) == 0 &&
+ !(resid == 0 && clen != 0))
+ snderr(ENOTCONN);
+ } else if (addr == 0)
+ snderr(so->so_proto->pr_flags & PR_CONNREQUIRED ?
+ ENOTCONN : 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 &&
+ (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 {
+#ifdef ZERO_COPY_SOCKETS
+ cow_send = 0;
+#endif /* ZERO_COPY_SOCKETS */
+ if (top == 0) {
+ MGETHDR(m, M_TRYWAIT, MT_DATA);
+ if (m == NULL) {
+ error = ENOBUFS;
+ goto release;
+ }
+ mlen = MHLEN;
+ m->m_pkthdr.len = 0;
+ m->m_pkthdr.rcvif = (struct ifnet *)0;
+ } else {
+ MGET(m, M_TRYWAIT, MT_DATA);
+ if (m == NULL) {
+ error = ENOBUFS;
+ goto release;
+ }
+ mlen = MLEN;
+ }
+ if (resid >= MINCLSIZE) {
+#ifdef ZERO_COPY_SOCKETS
+ if (so_zero_copy_send &&
+ resid>=PAGE_SIZE &&
+ space>=PAGE_SIZE &&
+ uio->uio_iov->iov_len>=PAGE_SIZE) {
+ so_zerocp_stats.size_ok++;
+ if (!((vm_offset_t)
+ uio->uio_iov->iov_base & PAGE_MASK)){
+ so_zerocp_stats.align_ok++;
+ cow_send = socow_setup(m, uio);
+ }
+ }
+ if (!cow_send){
+#endif /* ZERO_COPY_SOCKETS */
+ MCLGET(m, M_TRYWAIT);
+ if ((m->m_flags & M_EXT) == 0)
+ goto nopages;
+ mlen = MCLBYTES;
+ len = min(min(mlen, resid), space);
+ } else {
+#ifdef ZERO_COPY_SOCKETS
+ len = PAGE_SIZE;
+ }
+
+ } else {
+#endif /* ZERO_COPY_SOCKETS */
+nopages:
+ len = min(min(mlen, resid), space);
+ /*
+ * For datagram protocols, leave room
+ * for protocol headers in first mbuf.
+ */
+ if (atomic && top == 0 && len < mlen)
+ MH_ALIGN(m, len);
+ }
+ space -= len;
+#ifdef ZERO_COPY_SOCKETS
+ if (cow_send)
+ error = 0;
+ else
+#endif /* ZERO_COPY_SOCKETS */
+ 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 */
+ /*
+ * XXX all the SS_CANTSENDMORE checks previously
+ * done could be out of date. We could have recieved
+ * a reset packet in an interrupt or maybe we slept
+ * while doing page faults in uiomove() etc. We could
+ * probably recheck again inside the splnet() protection
+ * here, but there are probably other places that this
+ * also happens. We must rethink this.
+ */
+ error = (*so->so_proto->pr_usrreqs->pru_send)(so,
+ (flags & MSG_OOB) ? PRUS_OOB :
+ /*
+ * If the user set MSG_EOF, the protocol
+ * understands this flag and nothing left to
+ * send then use PRU_SEND_EOF instead of PRU_SEND.
+ */
+ ((flags & MSG_EOF) &&
+ (so->so_proto->pr_flags & PR_IMPLOPCL) &&
+ (resid <= 0)) ?
+ PRUS_EOF :
+ /* If there is more to send set PRUS_MORETOCOME */
+ (resid > 0 && space > 0) ? PRUS_MORETOCOME : 0,
+ top, addr, control, td);
+ 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.
+ */
+int
+soreceive(so, psa, uio, mp0, controlp, flagsp)
+ register struct socket *so;
+ struct sockaddr **psa;
+ struct uio *uio;
+ struct mbuf **mp0;
+ struct mbuf **controlp;
+ int *flagsp;
+{
+ struct mbuf *m, **mp;
+ register int flags, len, error, s, offset;
+ struct protosw *pr = so->so_proto;
+ struct mbuf *nextrecord;
+ int moff, type = 0;
+ int orig_resid = uio->uio_resid;
+
+ mp = mp0;
+ if (psa)
+ *psa = 0;
+ if (controlp)
+ *controlp = 0;
+ if (flagsp)
+ flags = *flagsp &~ MSG_EOR;
+ else
+ flags = 0;
+ if (flags & MSG_OOB) {
+ m = m_get(M_TRYWAIT, MT_DATA);
+ if (m == NULL)
+ return (ENOBUFS);
+ error = (*pr->pr_usrreqs->pru_rcvoob)(so, m, flags & MSG_PEEK);
+ if (error)
+ goto bad;
+ do {
+#ifdef ZERO_COPY_SOCKETS
+ if (so_zero_copy_receive) {
+ vm_page_t pg;
+ int disposable;
+
+ if ((m->m_flags & M_EXT)
+ && (m->m_ext.ext_type == EXT_DISPOSABLE))
+ disposable = 1;
+ else
+ disposable = 0;
+
+ pg = PHYS_TO_VM_PAGE(vtophys(mtod(m, caddr_t)));
+ if (uio->uio_offset == -1)
+ uio->uio_offset =IDX_TO_OFF(pg->pindex);
+
+ error = uiomoveco(mtod(m, caddr_t),
+ min(uio->uio_resid, m->m_len),
+ uio, pg->object,
+ disposable);
+ } else
+#endif /* ZERO_COPY_SOCKETS */
+ 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_usrreqs->pru_rcvd)(so, 0);
+
+restart:
+ error = sblock(&so->so_rcv, SBLOCKWAIT(flags));
+ if (error)
+ 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)) {
+ KASSERT(m != 0 || !so->so_rcv.sb_cc,
+ ("receive: m == %p so->so_rcv.sb_cc == %lu",
+ m, so->so_rcv.sb_cc));
+ 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_td)
+ uio->uio_td->td_proc->p_stats->p_ru.ru_msgrcv++;
+ nextrecord = m->m_nextpkt;
+ if (pr->pr_flags & PR_ADDR) {
+ KASSERT(m->m_type == MT_SONAME,
+ ("m->m_type == %d", m->m_type));
+ orig_resid = 0;
+ if (psa)
+ *psa = dup_sockaddr(mtod(m, struct sockaddr *),
+ mp0 == 0);
+ if (flags & MSG_PEEK) {
+ m = m->m_next;
+ } else {
+ sbfree(&so->so_rcv, m);
+ so->so_rcv.sb_mb = m_free(m);
+ 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);
+ so->so_rcv.sb_mb = m->m_next;
+ m->m_next = NULL;
+ if (pr->pr_domain->dom_externalize)
+ error =
+ (*pr->pr_domain->dom_externalize)(m, controlp);
+ else if (controlp)
+ *controlp = m;
+ else
+ m_freem(m);
+ m = so->so_rcv.sb_mb;
+ }
+ if (controlp) {
+ orig_resid = 0;
+ do
+ controlp = &(*controlp)->m_next;
+ while (*controlp != NULL);
+ }
+ }
+ 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;
+ else
+ KASSERT(m->m_type == MT_DATA || m->m_type == MT_HEADER,
+ ("m->m_type == %d", m->m_type));
+ 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);
+#ifdef ZERO_COPY_SOCKETS
+ if (so_zero_copy_receive) {
+ vm_page_t pg;
+ int disposable;
+
+ if ((m->m_flags & M_EXT)
+ && (m->m_ext.ext_type == EXT_DISPOSABLE))
+ disposable = 1;
+ else
+ disposable = 0;
+
+ pg = PHYS_TO_VM_PAGE(vtophys(mtod(m, caddr_t) +
+ moff));
+
+ if (uio->uio_offset == -1)
+ uio->uio_offset =IDX_TO_OFF(pg->pindex);
+
+ error = uiomoveco(mtod(m, caddr_t) + moff,
+ (int)len, uio,pg->object,
+ disposable);
+ } else
+#endif /* ZERO_COPY_SOCKETS */
+ error = uiomove(mtod(m, caddr_t) + moff, (int)len, uio);
+ s = splnet();
+ if (error)
+ goto release;
+ } 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 {
+ so->so_rcv.sb_mb = m_free(m);
+ 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_TRYWAIT);
+ 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;
+ /*
+ * Notify the protocol that some data has been
+ * drained before blocking.
+ */
+ if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
+ (*pr->pr_usrreqs->pru_rcvd)(so, flags);
+ error = sbwait(&so->so_rcv);
+ if (error) {
+ sbunlock(&so->so_rcv);
+ splx(s);
+ return (0);
+ }
+ m = so->so_rcv.sb_mb;
+ if (m)
+ 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_usrreqs->pru_rcvd)(so, flags);
+ }
+ 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);
+}
+
+int
+soshutdown(so, how)
+ register struct socket *so;
+ register int how;
+{
+ register struct protosw *pr = so->so_proto;
+
+ if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
+ return (EINVAL);
+
+ if (how != SHUT_WR)
+ sorflush(so);
+ if (how != SHUT_RD)
+ return ((*pr->pr_usrreqs->pru_shutdown)(so));
+ return (0);
+}
+
+void
+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(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, so);
+}
+
+#ifdef INET
+static int
+do_setopt_accept_filter(so, sopt)
+ struct socket *so;
+ struct sockopt *sopt;
+{
+ struct accept_filter_arg *afap = NULL;
+ struct accept_filter *afp;
+ struct so_accf *af = so->so_accf;
+ int error = 0;
+
+ /* do not set/remove accept filters on non listen sockets */
+ if ((so->so_options & SO_ACCEPTCONN) == 0) {
+ error = EINVAL;
+ goto out;
+ }
+
+ /* removing the filter */
+ if (sopt == NULL) {
+ if (af != NULL) {
+ if (af->so_accept_filter != NULL &&
+ af->so_accept_filter->accf_destroy != NULL) {
+ af->so_accept_filter->accf_destroy(so);
+ }
+ if (af->so_accept_filter_str != NULL) {
+ FREE(af->so_accept_filter_str, M_ACCF);
+ }
+ FREE(af, M_ACCF);
+ so->so_accf = NULL;
+ }
+ so->so_options &= ~SO_ACCEPTFILTER;
+ return (0);
+ }
+ /* adding a filter */
+ /* must remove previous filter first */
+ if (af != NULL) {
+ error = EINVAL;
+ goto out;
+ }
+ /* don't put large objects on the kernel stack */
+ MALLOC(afap, struct accept_filter_arg *, sizeof(*afap), M_TEMP, M_WAITOK);
+ error = sooptcopyin(sopt, afap, sizeof *afap, sizeof *afap);
+ afap->af_name[sizeof(afap->af_name)-1] = '\0';
+ afap->af_arg[sizeof(afap->af_arg)-1] = '\0';
+ if (error)
+ goto out;
+ afp = accept_filt_get(afap->af_name);
+ if (afp == NULL) {
+ error = ENOENT;
+ goto out;
+ }
+ MALLOC(af, struct so_accf *, sizeof(*af), M_ACCF, M_WAITOK | M_ZERO);
+ if (afp->accf_create != NULL) {
+ if (afap->af_name[0] != '\0') {
+ int len = strlen(afap->af_name) + 1;
+
+ MALLOC(af->so_accept_filter_str, char *, len, M_ACCF, M_WAITOK);
+ strcpy(af->so_accept_filter_str, afap->af_name);
+ }
+ af->so_accept_filter_arg = afp->accf_create(so, afap->af_arg);
+ if (af->so_accept_filter_arg == NULL) {
+ FREE(af->so_accept_filter_str, M_ACCF);
+ FREE(af, M_ACCF);
+ so->so_accf = NULL;
+ error = EINVAL;
+ goto out;
+ }
+ }
+ af->so_accept_filter = afp;
+ so->so_accf = af;
+ so->so_options |= SO_ACCEPTFILTER;
+out:
+ if (afap != NULL)
+ FREE(afap, M_TEMP);
+ return (error);
+}
+#endif /* INET */
+
+/*
+ * Perhaps this routine, and sooptcopyout(), below, ought to come in
+ * an additional variant to handle the case where the option value needs
+ * to be some kind of integer, but not a specific size.
+ * In addition to their use here, these functions are also called by the
+ * protocol-level pr_ctloutput() routines.
+ */
+int
+sooptcopyin(sopt, buf, len, minlen)
+ struct sockopt *sopt;
+ void *buf;
+ size_t len;
+ size_t minlen;
+{
+ size_t valsize;
+
+ /*
+ * If the user gives us more than we wanted, we ignore it,
+ * but if we don't get the minimum length the caller
+ * wants, we return EINVAL. On success, sopt->sopt_valsize
+ * is set to however much we actually retrieved.
+ */
+ if ((valsize = sopt->sopt_valsize) < minlen)
+ return EINVAL;
+ if (valsize > len)
+ sopt->sopt_valsize = valsize = len;
+
+ if (sopt->sopt_td != 0)
+ return (copyin(sopt->sopt_val, buf, valsize));
+
+ bcopy(sopt->sopt_val, buf, valsize);
+ return 0;
+}
+
+int
+sosetopt(so, sopt)
+ struct socket *so;
+ struct sockopt *sopt;
+{
+ int error, optval;
+ struct linger l;
+ struct timeval tv;
+ u_long val;
+
+ error = 0;
+ if (sopt->sopt_level != SOL_SOCKET) {
+ if (so->so_proto && so->so_proto->pr_ctloutput)
+ return ((*so->so_proto->pr_ctloutput)
+ (so, sopt));
+ error = ENOPROTOOPT;
+ } else {
+ switch (sopt->sopt_name) {
+#ifdef INET
+ case SO_ACCEPTFILTER:
+ error = do_setopt_accept_filter(so, sopt);
+ if (error)
+ goto bad;
+ break;
+#endif
+ case SO_LINGER:
+ error = sooptcopyin(sopt, &l, sizeof l, sizeof l);
+ if (error)
+ goto bad;
+
+ so->so_linger = l.l_linger;
+ if (l.l_onoff)
+ so->so_options |= SO_LINGER;
+ else
+ so->so_options &= ~SO_LINGER;
+ break;
+
+ case SO_DEBUG:
+ case SO_KEEPALIVE:
+ case SO_DONTROUTE:
+ case SO_USELOOPBACK:
+ case SO_BROADCAST:
+ case SO_REUSEADDR:
+ case SO_REUSEPORT:
+ case SO_OOBINLINE:
+ case SO_TIMESTAMP:
+ case SO_NOSIGPIPE:
+ error = sooptcopyin(sopt, &optval, sizeof optval,
+ sizeof optval);
+ if (error)
+ goto bad;
+ if (optval)
+ so->so_options |= sopt->sopt_name;
+ else
+ so->so_options &= ~sopt->sopt_name;
+ break;
+
+ case SO_SNDBUF:
+ case SO_RCVBUF:
+ case SO_SNDLOWAT:
+ case SO_RCVLOWAT:
+ error = sooptcopyin(sopt, &optval, sizeof optval,
+ sizeof optval);
+ if (error)
+ goto bad;
+
+ /*
+ * Values < 1 make no sense for any of these
+ * options, so disallow them.
+ */
+ if (optval < 1) {
+ error = EINVAL;
+ goto bad;
+ }
+
+ switch (sopt->sopt_name) {
+ case SO_SNDBUF:
+ case SO_RCVBUF:
+ if (sbreserve(sopt->sopt_name == SO_SNDBUF ?
+ &so->so_snd : &so->so_rcv, (u_long)optval,
+ so, curthread) == 0) {
+ error = ENOBUFS;
+ goto bad;
+ }
+ break;
+
+ /*
+ * Make sure the low-water is never greater than
+ * the high-water.
+ */
+ case SO_SNDLOWAT:
+ so->so_snd.sb_lowat =
+ (optval > so->so_snd.sb_hiwat) ?
+ so->so_snd.sb_hiwat : optval;
+ break;
+ case SO_RCVLOWAT:
+ so->so_rcv.sb_lowat =
+ (optval > so->so_rcv.sb_hiwat) ?
+ so->so_rcv.sb_hiwat : optval;
+ break;
+ }
+ break;
+
+ case SO_SNDTIMEO:
+ case SO_RCVTIMEO:
+ error = sooptcopyin(sopt, &tv, sizeof tv,
+ sizeof tv);
+ if (error)
+ goto bad;
+
+ /* assert(hz > 0); */
+ if (tv.tv_sec < 0 || tv.tv_sec > SHRT_MAX / hz ||
+ tv.tv_usec < 0 || tv.tv_usec >= 1000000) {
+ error = EDOM;
+ goto bad;
+ }
+ /* assert(tick > 0); */
+ /* assert(ULONG_MAX - SHRT_MAX >= 1000000); */
+ val = (u_long)(tv.tv_sec * hz) + tv.tv_usec / tick;
+ if (val > SHRT_MAX) {
+ error = EDOM;
+ goto bad;
+ }
+
+ switch (sopt->sopt_name) {
+ 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)
+ (so, sopt));
+ }
+ }
+bad:
+ return (error);
+}
+
+/* Helper routine for getsockopt */
+int
+sooptcopyout(sopt, buf, len)
+ struct sockopt *sopt;
+ void *buf;
+ size_t len;
+{
+ int error;
+ size_t valsize;
+
+ error = 0;
+
+ /*
+ * Documented get behavior is that we always return a value,
+ * possibly truncated to fit in the user's buffer.
+ * Traditional behavior is that we always tell the user
+ * precisely how much we copied, rather than something useful
+ * like the total amount we had available for her.
+ * Note that this interface is not idempotent; the entire answer must
+ * generated ahead of time.
+ */
+ valsize = min(len, sopt->sopt_valsize);
+ sopt->sopt_valsize = valsize;
+ if (sopt->sopt_val != 0) {
+ if (sopt->sopt_td != 0)
+ error = copyout(buf, sopt->sopt_val, valsize);
+ else
+ bcopy(buf, sopt->sopt_val, valsize);
+ }
+ return error;
+}
+
+int
+sogetopt(so, sopt)
+ struct socket *so;
+ struct sockopt *sopt;
+{
+ int error, optval;
+ struct linger l;
+ struct timeval tv;
+#ifdef INET
+ struct accept_filter_arg *afap;
+#endif
+
+ error = 0;
+ if (sopt->sopt_level != SOL_SOCKET) {
+ if (so->so_proto && so->so_proto->pr_ctloutput) {
+ return ((*so->so_proto->pr_ctloutput)
+ (so, sopt));
+ } else
+ return (ENOPROTOOPT);
+ } else {
+ switch (sopt->sopt_name) {
+#ifdef INET
+ case SO_ACCEPTFILTER:
+ if ((so->so_options & SO_ACCEPTCONN) == 0)
+ return (EINVAL);
+ MALLOC(afap, struct accept_filter_arg *, sizeof(*afap),
+ M_TEMP, M_WAITOK | M_ZERO);
+ if ((so->so_options & SO_ACCEPTFILTER) != 0) {
+ strcpy(afap->af_name, so->so_accf->so_accept_filter->accf_name);
+ if (so->so_accf->so_accept_filter_str != NULL)
+ strcpy(afap->af_arg, so->so_accf->so_accept_filter_str);
+ }
+ error = sooptcopyout(sopt, afap, sizeof(*afap));
+ FREE(afap, M_TEMP);
+ break;
+#endif
+
+ case SO_LINGER:
+ l.l_onoff = so->so_options & SO_LINGER;
+ l.l_linger = so->so_linger;
+ error = sooptcopyout(sopt, &l, sizeof l);
+ 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:
+ case SO_TIMESTAMP:
+ case SO_NOSIGPIPE:
+ optval = so->so_options & sopt->sopt_name;
+integer:
+ error = sooptcopyout(sopt, &optval, sizeof optval);
+ break;
+
+ case SO_TYPE:
+ optval = so->so_type;
+ goto integer;
+
+ case SO_ERROR:
+ optval = so->so_error;
+ so->so_error = 0;
+ goto integer;
+
+ case SO_SNDBUF:
+ optval = so->so_snd.sb_hiwat;
+ goto integer;
+
+ case SO_RCVBUF:
+ optval = so->so_rcv.sb_hiwat;
+ goto integer;
+
+ case SO_SNDLOWAT:
+ optval = so->so_snd.sb_lowat;
+ goto integer;
+
+ case SO_RCVLOWAT:
+ optval = so->so_rcv.sb_lowat;
+ goto integer;
+
+ case SO_SNDTIMEO:
+ case SO_RCVTIMEO:
+ optval = (sopt->sopt_name == SO_SNDTIMEO ?
+ so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
+
+ tv.tv_sec = optval / hz;
+ tv.tv_usec = (optval % hz) * tick;
+ error = sooptcopyout(sopt, &tv, sizeof tv);
+ break;
+
+ default:
+ error = ENOPROTOOPT;
+ break;
+ }
+ return (error);
+ }
+}
+
+/* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */
+int
+soopt_getm(struct sockopt *sopt, struct mbuf **mp)
+{
+ struct mbuf *m, *m_prev;
+ int sopt_size = sopt->sopt_valsize;
+
+ MGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT, MT_DATA);
+ if (m == 0)
+ return ENOBUFS;
+ if (sopt_size > MLEN) {
+ MCLGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT);
+ if ((m->m_flags & M_EXT) == 0) {
+ m_free(m);
+ return ENOBUFS;
+ }
+ m->m_len = min(MCLBYTES, sopt_size);
+ } else {
+ m->m_len = min(MLEN, sopt_size);
+ }
+ sopt_size -= m->m_len;
+ *mp = m;
+ m_prev = m;
+
+ while (sopt_size) {
+ MGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT, MT_DATA);
+ if (m == 0) {
+ m_freem(*mp);
+ return ENOBUFS;
+ }
+ if (sopt_size > MLEN) {
+ MCLGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT);
+ if ((m->m_flags & M_EXT) == 0) {
+ m_freem(*mp);
+ return ENOBUFS;
+ }
+ m->m_len = min(MCLBYTES, sopt_size);
+ } else {
+ m->m_len = min(MLEN, sopt_size);
+ }
+ sopt_size -= m->m_len;
+ m_prev->m_next = m;
+ m_prev = m;
+ }
+ return 0;
+}
+
+/* XXX; copyin sopt data into mbuf chain for (__FreeBSD__ < 3) routines. */
+int
+soopt_mcopyin(struct sockopt *sopt, struct mbuf *m)
+{
+ struct mbuf *m0 = m;
+
+ if (sopt->sopt_val == NULL)
+ return 0;
+ while (m != NULL && sopt->sopt_valsize >= m->m_len) {
+ if (sopt->sopt_td != NULL) {
+ int error;
+
+ error = copyin(sopt->sopt_val, mtod(m, char *),
+ m->m_len);
+ if (error != 0) {
+ m_freem(m0);
+ return(error);
+ }
+ } else
+ bcopy(sopt->sopt_val, mtod(m, char *), m->m_len);
+ sopt->sopt_valsize -= m->m_len;
+ (caddr_t)sopt->sopt_val += m->m_len;
+ m = m->m_next;
+ }
+ if (m != NULL) /* should be allocated enoughly at ip6_sooptmcopyin() */
+ panic("ip6_sooptmcopyin");
+ return 0;
+}
+
+/* XXX; copyout mbuf chain data into soopt for (__FreeBSD__ < 3) routines. */
+int
+soopt_mcopyout(struct sockopt *sopt, struct mbuf *m)
+{
+ struct mbuf *m0 = m;
+ size_t valsize = 0;
+
+ if (sopt->sopt_val == NULL)
+ return 0;
+ while (m != NULL && sopt->sopt_valsize >= m->m_len) {
+ if (sopt->sopt_td != NULL) {
+ int error;
+
+ error = copyout(mtod(m, char *), sopt->sopt_val,
+ m->m_len);
+ if (error != 0) {
+ m_freem(m0);
+ return(error);
+ }
+ } else
+ bcopy(mtod(m, char *), sopt->sopt_val, m->m_len);
+ sopt->sopt_valsize -= m->m_len;
+ (caddr_t)sopt->sopt_val += m->m_len;
+ valsize += m->m_len;
+ m = m->m_next;
+ }
+ if (m != NULL) {
+ /* enough soopt buffer should be given from user-land */
+ m_freem(m0);
+ return(EINVAL);
+ }
+ sopt->sopt_valsize = valsize;
+ return 0;
+}
+
+void
+sohasoutofband(so)
+ register struct socket *so;
+{
+ if (so->so_sigio != NULL)
+ pgsigio(&so->so_sigio, SIGURG, 0);
+ selwakeup(&so->so_rcv.sb_sel);
+}
+
+int
+sopoll(struct socket *so, int events, struct ucred *cred, struct thread *td)
+{
+ int revents = 0;
+ int s = splnet();
+
+ if (events & (POLLIN | POLLRDNORM))
+ if (soreadable(so))
+ revents |= events & (POLLIN | POLLRDNORM);
+
+ if (events & POLLINIGNEOF)
+ if (so->so_rcv.sb_cc >= so->so_rcv.sb_lowat ||
+ !TAILQ_EMPTY(&so->so_comp) || so->so_error)
+ revents |= POLLINIGNEOF;
+
+ if (events & (POLLOUT | POLLWRNORM))
+ if (sowriteable(so))
+ revents |= events & (POLLOUT | POLLWRNORM);
+
+ if (events & (POLLPRI | POLLRDBAND))
+ if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
+ revents |= events & (POLLPRI | POLLRDBAND);
+
+ if (revents == 0) {
+ if (events &
+ (POLLIN | POLLINIGNEOF | POLLPRI | POLLRDNORM |
+ POLLRDBAND)) {
+ selrecord(td, &so->so_rcv.sb_sel);
+ so->so_rcv.sb_flags |= SB_SEL;
+ }
+
+ if (events & (POLLOUT | POLLWRNORM)) {
+ selrecord(td, &so->so_snd.sb_sel);
+ so->so_snd.sb_flags |= SB_SEL;
+ }
+ }
+
+ splx(s);
+ return (revents);
+}
+
+int
+sokqfilter(struct file *fp, struct knote *kn)
+{
+ struct socket *so = (struct socket *)kn->kn_fp->f_data;
+ struct sockbuf *sb;
+ int s;
+
+ switch (kn->kn_filter) {
+ case EVFILT_READ:
+ if (so->so_options & SO_ACCEPTCONN)
+ kn->kn_fop = &solisten_filtops;
+ else
+ kn->kn_fop = &soread_filtops;
+ sb = &so->so_rcv;
+ break;
+ case EVFILT_WRITE:
+ kn->kn_fop = &sowrite_filtops;
+ sb = &so->so_snd;
+ break;
+ default:
+ return (1);
+ }
+
+ s = splnet();
+ SLIST_INSERT_HEAD(&sb->sb_sel.si_note, kn, kn_selnext);
+ sb->sb_flags |= SB_KNOTE;
+ splx(s);
+ return (0);
+}
+
+static void
+filt_sordetach(struct knote *kn)
+{
+ struct socket *so = (struct socket *)kn->kn_fp->f_data;
+ int s = splnet();
+
+ SLIST_REMOVE(&so->so_rcv.sb_sel.si_note, kn, knote, kn_selnext);
+ if (SLIST_EMPTY(&so->so_rcv.sb_sel.si_note))
+ so->so_rcv.sb_flags &= ~SB_KNOTE;
+ splx(s);
+}
+
+/*ARGSUSED*/
+static int
+filt_soread(struct knote *kn, long hint)
+{
+ struct socket *so = (struct socket *)kn->kn_fp->f_data;
+
+ kn->kn_data = so->so_rcv.sb_cc;
+ if (so->so_state & SS_CANTRCVMORE) {
+ kn->kn_flags |= EV_EOF;
+ kn->kn_fflags = so->so_error;
+ return (1);
+ }
+ if (so->so_error) /* temporary udp error */
+ return (1);
+ if (kn->kn_sfflags & NOTE_LOWAT)
+ return (kn->kn_data >= kn->kn_sdata);
+ return (kn->kn_data >= so->so_rcv.sb_lowat);
+}
+
+static void
+filt_sowdetach(struct knote *kn)
+{
+ struct socket *so = (struct socket *)kn->kn_fp->f_data;
+ int s = splnet();
+
+ SLIST_REMOVE(&so->so_snd.sb_sel.si_note, kn, knote, kn_selnext);
+ if (SLIST_EMPTY(&so->so_snd.sb_sel.si_note))
+ so->so_snd.sb_flags &= ~SB_KNOTE;
+ splx(s);
+}
+
+/*ARGSUSED*/
+static int
+filt_sowrite(struct knote *kn, long hint)
+{
+ struct socket *so = (struct socket *)kn->kn_fp->f_data;
+
+ kn->kn_data = sbspace(&so->so_snd);
+ if (so->so_state & SS_CANTSENDMORE) {
+ kn->kn_flags |= EV_EOF;
+ kn->kn_fflags = so->so_error;
+ return (1);
+ }
+ if (so->so_error) /* temporary udp error */
+ return (1);
+ if (((so->so_state & SS_ISCONNECTED) == 0) &&
+ (so->so_proto->pr_flags & PR_CONNREQUIRED))
+ return (0);
+ if (kn->kn_sfflags & NOTE_LOWAT)
+ return (kn->kn_data >= kn->kn_sdata);
+ return (kn->kn_data >= so->so_snd.sb_lowat);
+}
+
+/*ARGSUSED*/
+static int
+filt_solisten(struct knote *kn, long hint)
+{
+ struct socket *so = (struct socket *)kn->kn_fp->f_data;
+
+ kn->kn_data = so->so_qlen;
+ return (! TAILQ_EMPTY(&so->so_comp));
+}
+
+int
+socheckuid(struct socket *so, uid_t uid)
+{
+
+ if (so == NULL)
+ return (EPERM);
+ if (so->so_cred->cr_uid == uid)
+ return (0);
+ return (EPERM);
+}
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