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120 lines
3.7 KiB
C
120 lines
3.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (C) 2020 Giuseppe Lettieri. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* $FreeBSD$
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*
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* netmap support for: tun
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*
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* The actual support comes from the netmap generic driver. The purpose of these
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* functions is to make the tun device similar to an ethernet device, just enough
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* for the generic driver to work with it.
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*
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* Two adjustments are needed:
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*
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* - In tunwrite(), when in netmap mode, we prepend a fake ethernet header that contains the family
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* (AF_INET or AF_INET6) and then call the (overriden) if_input method;
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*
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* - We also provide the if_input method called by netmap when trying to inject packets
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* into the host stack
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*/
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#include <net/netmap.h>
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#include <sys/selinfo.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <machine/bus.h>
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#include <machine/resource.h>
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#include <sys/bus.h>
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#include <sys/rman.h>
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#include <net/ethernet.h>
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#include <dev/netmap/netmap_kern.h>
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static void
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netmap_tuninput(struct ifnet *ifp, struct mbuf *m)
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{
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struct ether_header *eh;
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u_short etype;
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int isr;
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if (m->m_len < ETHER_HDR_LEN) {
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nm_prlim(5, "discarding malformed mbuf (m->m_len == %d)", m->m_len);
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goto error;
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}
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eh = mtod(m, struct ether_header *);
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etype = ntohs(eh->ether_type);
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switch (etype) {
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case ETHERTYPE_IP:
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isr = NETISR_IP;
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break;
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case ETHERTYPE_IPV6:
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isr = NETISR_IPV6;
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break;
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default:
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nm_prlim(5, "discarding packet with ethertype %02x", etype);
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goto error;
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}
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m_adj(m, ETHER_HDR_LEN);
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if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
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if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
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m->m_pkthdr.rcvif = ifp;
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CURVNET_SET(ifp->if_vnet);
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M_SETFIB(m, ifp->if_fib);
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netisr_dispatch(isr, m);
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CURVNET_RESTORE();
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return;
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error:
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if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
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m_free(m);
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return;
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}
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static int
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netmap_tuncapture(struct ifnet *ifp, int isr, struct mbuf *m)
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{
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struct netmap_adapter *na = NA(ifp);
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struct ether_header *eh;
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if (!nm_netmap_on(na))
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return 0;
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M_PREPEND(m, ETHER_HDR_LEN, M_NOWAIT);
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if (m == NULL) {
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nm_prlim(5, "failed to prepend fake ethernet header, skipping");
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return 0;
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}
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eh = mtod(m, struct ether_header *);
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eh->ether_type = htons(isr == AF_INET6 ? ETHERTYPE_IPV6 : ETHERTYPE_IP);
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memcpy(eh->ether_shost, "\x02\x02\x02\x02\x02\x02", ETHER_ADDR_LEN);
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memcpy(eh->ether_dhost, "\x06\x06\x06\x06\x06\x06", ETHER_ADDR_LEN);
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(*ifp->if_input)(ifp, m);
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return 1; /* stolen */
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}
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/* end of file */
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