78a6b08618
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended.
170 lines
4.7 KiB
C
170 lines
4.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-NetBSD
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*
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* Copyright (c) 1998 The NetBSD Foundation, Inc.
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* Copyright (c) 2014 Andrey V. Elsukov <ae@FreeBSD.org>
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Heiko W.Rupp <hwr@pilhuhn.de>
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*
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* IPv6-over-GRE contributed by Gert Doering <gert@greenie.muc.de>
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS 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 PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* $NetBSD: ip_gre.c,v 1.29 2003/09/05 23:02:43 itojun Exp $
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/protosw.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/rmlock.h>
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#include <sys/sysctl.h>
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#include <net/ethernet.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/vnet.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/ip_encap.h>
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#include <netinet/ip_var.h>
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#ifdef INET6
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#include <netinet/ip6.h>
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#endif
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#include <net/if_gre.h>
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extern struct domain inetdomain;
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static const struct protosw in_gre_protosw = {
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.pr_type = SOCK_RAW,
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.pr_domain = &inetdomain,
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.pr_protocol = IPPROTO_GRE,
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.pr_flags = PR_ATOMIC|PR_ADDR,
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.pr_input = gre_input,
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.pr_output = rip_output,
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.pr_ctlinput = rip_ctlinput,
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.pr_ctloutput = rip_ctloutput,
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.pr_usrreqs = &rip_usrreqs
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};
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#define GRE_TTL 30
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VNET_DEFINE(int, ip_gre_ttl) = GRE_TTL;
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#define V_ip_gre_ttl VNET(ip_gre_ttl)
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SYSCTL_INT(_net_inet_ip, OID_AUTO, grettl, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(ip_gre_ttl), 0, "");
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static int
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in_gre_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
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{
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GRE_RLOCK_TRACKER;
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struct gre_softc *sc;
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struct ip *ip;
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sc = (struct gre_softc *)arg;
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if ((GRE2IFP(sc)->if_flags & IFF_UP) == 0)
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return (0);
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M_ASSERTPKTHDR(m);
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/*
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* We expect that payload contains at least IPv4
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* or IPv6 packet.
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*/
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if (m->m_pkthdr.len < sizeof(struct greip) + sizeof(struct ip))
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return (0);
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GRE_RLOCK(sc);
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if (sc->gre_family == 0)
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goto bad;
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KASSERT(sc->gre_family == AF_INET,
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("wrong gre_family: %d", sc->gre_family));
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ip = mtod(m, struct ip *);
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if (sc->gre_oip.ip_src.s_addr != ip->ip_dst.s_addr ||
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sc->gre_oip.ip_dst.s_addr != ip->ip_src.s_addr)
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goto bad;
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GRE_RUNLOCK(sc);
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return (32 * 2);
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bad:
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GRE_RUNLOCK(sc);
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return (0);
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}
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int
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in_gre_output(struct mbuf *m, int af, int hlen)
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{
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struct greip *gi;
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gi = mtod(m, struct greip *);
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switch (af) {
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case AF_INET:
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/*
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* gre_transmit() has used M_PREPEND() that doesn't guarantee
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* m_data is contiguous more than hlen bytes. Use m_copydata()
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* here to avoid m_pullup().
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*/
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m_copydata(m, hlen + offsetof(struct ip, ip_tos),
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sizeof(u_char), &gi->gi_ip.ip_tos);
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m_copydata(m, hlen + offsetof(struct ip, ip_id),
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sizeof(u_short), (caddr_t)&gi->gi_ip.ip_id);
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break;
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#ifdef INET6
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case AF_INET6:
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gi->gi_ip.ip_tos = 0; /* XXX */
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ip_fillid(&gi->gi_ip);
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break;
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#endif
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}
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gi->gi_ip.ip_ttl = V_ip_gre_ttl;
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gi->gi_ip.ip_len = htons(m->m_pkthdr.len);
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return (ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL));
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}
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int
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in_gre_attach(struct gre_softc *sc)
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{
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KASSERT(sc->gre_ecookie == NULL, ("gre_ecookie isn't NULL"));
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sc->gre_ecookie = encap_attach_func(AF_INET, IPPROTO_GRE,
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in_gre_encapcheck, &in_gre_protosw, sc);
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if (sc->gre_ecookie == NULL)
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return (EEXIST);
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return (0);
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}
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