323 lines
10 KiB
C
323 lines
10 KiB
C
/* $OpenBSD: if_loop.c,v 1.98 2023/12/29 11:43:04 bluhm Exp $ */
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/* $NetBSD: if_loop.c,v 1.15 1996/05/07 02:40:33 thorpej Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* 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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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. 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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* @(#)if_loop.c 8.1 (Berkeley) 6/10/93
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*/
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/*
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* @(#)COPYRIGHT 1.1 (NRL) 17 January 1995
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*
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* NRL grants permission for redistribution and use in source and binary
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* forms, with or without modification, of the software and documentation
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* created at NRL provided that the following conditions are met:
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*
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgements:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* This product includes software developed at the Information
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* Technology Division, US Naval Research Laboratory.
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* 4. Neither the name of the NRL nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THE SOFTWARE PROVIDED BY NRL IS PROVIDED BY NRL AND CONTRIBUTORS ``AS
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* IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NRL OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* The views and conclusions contained in the software and documentation
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* are those of the authors and should not be interpreted as representing
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* official policies, either expressed or implied, of the US Naval
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* Research Laboratory (NRL).
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*/
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/*
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* Loopback interface driver for protocol testing and timing.
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*/
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#include "bpfilter.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/errno.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_types.h>
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#include <net/netisr.h>
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#include <net/rtable.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#ifdef INET6
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#include <netinet/ip6.h>
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#endif
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#ifdef MPLS
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#include <netmpls/mpls.h>
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#endif
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#if NBPFILTER > 0
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#include <net/bpf.h>
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#endif
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#define LOMTU 32768
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int loioctl(struct ifnet *, u_long, caddr_t);
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void loopattach(int);
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void lortrequest(struct ifnet *, int, struct rtentry *);
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void loinput(struct ifnet *, struct mbuf *);
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int looutput(struct ifnet *,
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struct mbuf *, struct sockaddr *, struct rtentry *);
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int lo_bpf_mtap(caddr_t, const struct mbuf *, u_int);
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int loop_clone_create(struct if_clone *, int);
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int loop_clone_destroy(struct ifnet *);
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struct if_clone loop_cloner =
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IF_CLONE_INITIALIZER("lo", loop_clone_create, loop_clone_destroy);
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void
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loopattach(int n)
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{
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if (loop_clone_create(&loop_cloner, 0))
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panic("unable to create lo0");
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if_clone_attach(&loop_cloner);
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}
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int
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loop_clone_create(struct if_clone *ifc, int unit)
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{
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struct ifnet *ifp;
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ifp = malloc(sizeof(*ifp), M_DEVBUF, M_WAITOK|M_ZERO);
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snprintf(ifp->if_xname, sizeof ifp->if_xname, "lo%d", unit);
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ifp->if_softc = NULL;
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ifp->if_mtu = LOMTU;
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ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
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ifp->if_xflags = IFXF_CLONED | IFXF_LRO;
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ifp->if_capabilities = IFCAP_CSUM_IPv4 |
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IFCAP_CSUM_TCPv4 | IFCAP_CSUM_UDPv4 |
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IFCAP_CSUM_TCPv6 | IFCAP_CSUM_UDPv6 |
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IFCAP_LRO | IFCAP_TSOv4 | IFCAP_TSOv6;
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ifp->if_bpf_mtap = lo_bpf_mtap;
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ifp->if_rtrequest = lortrequest;
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ifp->if_ioctl = loioctl;
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ifp->if_input = loinput;
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ifp->if_output = looutput;
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ifp->if_type = IFT_LOOP;
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ifp->if_hdrlen = sizeof(u_int32_t);
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if_counters_alloc(ifp);
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if (unit == 0) {
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if_attachhead(ifp);
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if_addgroup(ifp, ifc->ifc_name);
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rtable_l2set(0, 0, ifp->if_index);
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} else
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if_attach(ifp);
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if_alloc_sadl(ifp);
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#if NBPFILTER > 0
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bpfattach(&ifp->if_bpf, ifp, DLT_LOOP, sizeof(u_int32_t));
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#endif
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return (0);
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}
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int
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loop_clone_destroy(struct ifnet *ifp)
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{
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struct ifnet *p;
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unsigned int rdomain = 0;
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if (ifp->if_index == rtable_loindex(ifp->if_rdomain)) {
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/* rdomain 0 always needs a loopback */
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if (ifp->if_rdomain == 0)
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return (EPERM);
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/* if there is any other interface in this rdomain, deny */
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NET_LOCK_SHARED();
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TAILQ_FOREACH(p, &ifnetlist, if_list) {
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if (p->if_rdomain != ifp->if_rdomain)
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continue;
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if (p->if_index == ifp->if_index)
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continue;
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NET_UNLOCK_SHARED();
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return (EBUSY);
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}
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NET_UNLOCK_SHARED();
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rdomain = ifp->if_rdomain;
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}
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if_detach(ifp);
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free(ifp, M_DEVBUF, sizeof(*ifp));
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if (rdomain)
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rtable_l2set(rdomain, 0, 0);
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return (0);
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}
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int
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lo_bpf_mtap(caddr_t if_bpf, const struct mbuf *m, u_int dir)
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{
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/* loopback dumps on output, disable input bpf */
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return (0);
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}
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void
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loinput(struct ifnet *ifp, struct mbuf *m)
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{
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int error;
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if ((m->m_flags & M_PKTHDR) == 0)
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panic("%s: no header mbuf", __func__);
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error = if_input_local(ifp, m, m->m_pkthdr.ph_family);
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if (error)
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counters_inc(ifp->if_counters, ifc_ierrors);
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}
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int
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looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
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struct rtentry *rt)
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{
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if ((m->m_flags & M_PKTHDR) == 0)
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panic("%s: no header mbuf", __func__);
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if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
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m_freem(m);
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return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
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rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
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}
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/*
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* Do not call if_input_local() directly. Queue the packet to avoid
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* stack overflow and make TCP handshake over loopback work.
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*/
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return (if_output_local(ifp, m, dst->sa_family));
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}
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void
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lortrequest(struct ifnet *ifp, int cmd, struct rtentry *rt)
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{
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if (rt && rt->rt_mtu == 0)
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rt->rt_mtu = LOMTU;
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}
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/*
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* Process an ioctl request.
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*/
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int
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loioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
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{
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struct ifreq *ifr;
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int error = 0;
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switch (cmd) {
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case SIOCSIFFLAGS:
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if (ISSET(ifp->if_xflags, IFXF_LRO))
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SET(ifp->if_capabilities, IFCAP_TSOv4 | IFCAP_TSOv6);
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else
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CLR(ifp->if_capabilities, IFCAP_TSOv4 | IFCAP_TSOv6);
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break;
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case SIOCSIFADDR:
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ifp->if_flags |= IFF_RUNNING;
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if_up(ifp); /* send up RTM_IFINFO */
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/*
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* Everything else is done at a higher level.
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*/
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break;
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case SIOCADDMULTI:
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case SIOCDELMULTI:
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break;
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case SIOCSIFMTU:
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ifr = (struct ifreq *)data;
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ifp->if_mtu = ifr->ifr_mtu;
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break;
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default:
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error = ENOTTY;
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}
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return (error);
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}
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