BSD 4.4 Lite Kernel Sources

1 files changed, 160 insertions, 0 deletions

diff --git a/sys/netns/ns_output.c b/sys/netns/ns_output.c
new file mode 100644
index 0000000..4c9f364
--- /dev/null
+++ b/sys/netns/ns_output.c
@@ -0,0 +1,160 @@
+/*
+ * Copyright (c) 1984, 1985, 1986, 1987, 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.
+ *
+ *	@(#)ns_output.c	8.1 (Berkeley) 6/10/93
+ */
+
+#include <sys/param.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/errno.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+
+#include <net/if.h>
+#include <net/route.h>
+
+#include <netns/ns.h>
+#include <netns/ns_if.h>
+#include <netns/idp.h>
+#include <netns/idp_var.h>
+
+#ifdef vax
+#include <machine/mtpr.h>
+#endif
+int ns_hold_output = 0;
+int ns_copy_output = 0;
+int ns_output_cnt = 0;
+struct mbuf *ns_lastout;
+
+ns_output(m0, ro, flags)
+	struct mbuf *m0;
+	struct route *ro;
+	int flags;
+{
+	register struct idp *idp = mtod(m0, struct idp *);
+	register struct ifnet *ifp = 0;
+	int error = 0;
+	struct route idproute;
+	struct sockaddr_ns *dst;
+	extern int idpcksum;
+
+	if (ns_hold_output) {
+		if (ns_lastout) {
+			(void)m_free(ns_lastout);
+		}
+		ns_lastout = m_copy(m0, 0, (int)M_COPYALL);
+	}
+	/*
+	 * Route packet.
+	 */
+	if (ro == 0) {
+		ro = &idproute;
+		bzero((caddr_t)ro, sizeof (*ro));
+	}
+	dst = (struct sockaddr_ns *)&ro->ro_dst;
+	if (ro->ro_rt == 0) {
+		dst->sns_family = AF_NS;
+		dst->sns_len = sizeof (*dst);
+		dst->sns_addr = idp->idp_dna;
+		dst->sns_addr.x_port = 0;
+		/*
+		 * If routing to interface only,
+		 * short circuit routing lookup.
+		 */
+		if (flags & NS_ROUTETOIF) {
+			struct ns_ifaddr *ia = ns_iaonnetof(&idp->idp_dna);
+
+			if (ia == 0) {
+				error = ENETUNREACH;
+				goto bad;
+			}
+			ifp = ia->ia_ifp;
+			goto gotif;
+		}
+		rtalloc(ro);
+	} else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) {
+		/*
+		 * The old route has gone away; try for a new one.
+		 */
+		rtfree(ro->ro_rt);
+		ro->ro_rt = NULL;
+		rtalloc(ro);
+	}
+	if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
+		error = ENETUNREACH;
+		goto bad;
+	}
+	ro->ro_rt->rt_use++;
+	if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST))
+		dst = (struct sockaddr_ns *)ro->ro_rt->rt_gateway;
+gotif:
+
+	/*
+	 * Look for multicast addresses and
+	 * and verify user is allowed to send
+	 * such a packet.
+	 */
+	if (dst->sns_addr.x_host.c_host[0]&1) {
+		if ((ifp->if_flags & IFF_BROADCAST) == 0) {
+			error = EADDRNOTAVAIL;
+			goto bad;
+		}
+		if ((flags & NS_ALLOWBROADCAST) == 0) {
+			error = EACCES;
+			goto bad;
+		}
+	}
+
+	if (htons(idp->idp_len) <= ifp->if_mtu) {
+		ns_output_cnt++;
+		if (ns_copy_output) {
+			ns_watch_output(m0, ifp);
+		}
+		error = (*ifp->if_output)(ifp, m0,
+					(struct sockaddr *)dst, ro->ro_rt);
+		goto done;
+	} else error = EMSGSIZE;
+
+
+bad:
+	if (ns_copy_output) {
+		ns_watch_output(m0, ifp);
+	}
+	m_freem(m0);
+done:
+	if (ro == &idproute && (flags & NS_ROUTETOIF) == 0 && ro->ro_rt) {
+		RTFREE(ro->ro_rt);
+		ro->ro_rt = 0;
+	}
+	return (error);
+}