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authorwollman <wollman@FreeBSD.org>1994-12-22 21:00:05 +0000
committerwollman <wollman@FreeBSD.org>1994-12-22 21:00:05 +0000
commitad03fd1aa192db2fa705853fcbf3fb6b33795c5a (patch)
tree45f0559d7655062915c6c9fa06f19c285b931547 /sys/net/if_disc.c
parent18f4f1ed44dd9cbd6db64ddb4b62fee1f4f8448e (diff)
downloadFreeBSD-src-ad03fd1aa192db2fa705853fcbf3fb6b33795c5a.zip
FreeBSD-src-ad03fd1aa192db2fa705853fcbf3fb6b33795c5a.tar.gz
Added `ds', a black-hole network interface.
Diffstat (limited to 'sys/net/if_disc.c')
-rw-r--r--sys/net/if_disc.c220
1 files changed, 220 insertions, 0 deletions
diff --git a/sys/net/if_disc.c b/sys/net/if_disc.c
new file mode 100644
index 0000000..a6031dd
--- /dev/null
+++ b/sys/net/if_disc.c
@@ -0,0 +1,220 @@
+/*
+ * Copyright (c) 1982, 1986, 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.
+ *
+ * From: @(#)if_loop.c 8.1 (Berkeley) 6/10/93
+ * $Id: if_loop.c,v 1.6 1994/08/08 12:07:25 davidg Exp $
+ */
+
+/*
+ * Discard interface driver for protocol testing and timing.
+ * (Based on the loopback.)
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/mbuf.h>
+#include <sys/socket.h>
+#include <sys/errno.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include <machine/cpu.h>
+
+#include <net/if.h>
+#include <net/if_types.h>
+#include <net/netisr.h>
+#include <net/route.h>
+#include <net/bpf.h>
+
+#ifdef INET
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/in_var.h>
+#include <netinet/ip.h>
+#endif
+
+#ifdef NS
+#include <netns/ns.h>
+#include <netns/ns_if.h>
+#endif
+
+#ifdef ISO
+#include <netiso/iso.h>
+#include <netiso/iso_var.h>
+#endif
+
+#include "bpfilter.h"
+
+#ifdef TINY_DSMTU
+#define DSMTU (1024+512)
+#else
+#define DSMTU 65532
+#endif
+
+static struct ifnet dsif;
+static int dsoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
+ struct rtentry *);
+static int dsioctl(struct ifnet *, int, caddr_t);
+
+/* ARGSUSED */
+static void
+discattach(void)
+{
+ register struct ifnet *ifp = &dsif;
+
+ ifp->if_name = "ds";
+ ifp->if_mtu = DSMTU;
+ ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
+ ifp->if_ioctl = dsioctl;
+ ifp->if_output = dsoutput;
+ ifp->if_type = IFT_LOOP;
+ ifp->if_hdrlen = 0;
+ ifp->if_addrlen = 0;
+ if_attach(ifp);
+#if NBPFILTER > 0
+ bpfattach(&ifp->if_bpf, ifp, DLT_NULL, sizeof(u_int));
+#endif
+}
+
+TEXT_SET(pseudo_set, discattach);
+
+static int
+dsoutput(ifp, m, dst, rt)
+ struct ifnet *ifp;
+ register struct mbuf *m;
+ struct sockaddr *dst;
+ register struct rtentry *rt;
+{
+ int s, isr;
+ register struct ifqueue *ifq = 0;
+
+ if ((m->m_flags & M_PKTHDR) == 0)
+ panic("dsoutput no HDR");
+ ifp->if_lastchange = time;
+#if NBPFILTER > 0
+ if (dsif.if_bpf) {
+ /*
+ * We need to prepend the address family as
+ * a four byte field. Cons up a dummy header
+ * to pacify bpf. This is safe because bpf
+ * will only read from the mbuf (i.e., it won't
+ * try to free it or keep a pointer a to it).
+ */
+ struct mbuf m0;
+ u_int af = dst->sa_family;
+
+ m0.m_next = m;
+ m0.m_len = 4;
+ m0.m_data = (char *)&af;
+
+ bpf_mtap(dsif.if_bpf, &m0);
+ }
+#endif
+ m->m_pkthdr.rcvif = ifp;
+
+ if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
+ m_freem(m);
+ return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
+ rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
+ }
+ ifp->if_opackets++;
+ ifp->if_obytes += m->m_pkthdr.len;
+
+ m_freem(m);
+ return 0;
+}
+
+/* ARGSUSED */
+static void
+dsrtrequest(cmd, rt, sa)
+ int cmd;
+ struct rtentry *rt;
+ struct sockaddr *sa;
+{
+ if (rt)
+ rt->rt_rmx.rmx_mtu = DSMTU;
+}
+
+/*
+ * Process an ioctl request.
+ */
+/* ARGSUSED */
+int
+dsioctl(ifp, cmd, data)
+ register struct ifnet *ifp;
+ int cmd;
+ caddr_t data;
+{
+ register struct ifaddr *ifa;
+ register struct ifreq *ifr = (struct ifreq *)data;
+ register int error = 0;
+
+ switch (cmd) {
+
+ case SIOCSIFADDR:
+ ifp->if_flags |= IFF_UP;
+ ifa = (struct ifaddr *)data;
+ if (ifa != 0)
+ ifa->ifa_rtrequest = dsrtrequest;
+ /*
+ * Everything else is done at a higher level.
+ */
+ break;
+
+ case SIOCADDMULTI:
+ case SIOCDELMULTI:
+ if (ifr == 0) {
+ error = EAFNOSUPPORT; /* XXX */
+ break;
+ }
+ switch (ifr->ifr_addr.sa_family) {
+
+#ifdef INET
+ case AF_INET:
+ break;
+#endif
+
+ default:
+ error = EAFNOSUPPORT;
+ break;
+ }
+ break;
+
+ case SIOCSIFMTU:
+ ifp->if_mtu = ifr->ifr_mtu;
+ break;
+
+ default:
+ error = EINVAL;
+ }
+ return (error);
+}
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