1274246Sae/*- 2274246Sae * Copyright (c) 2014 Andrey V. Elsukov <ae@FreeBSD.org> 3274246Sae * All rights reserved. 4274246Sae * 5274246Sae * Redistribution and use in source and binary forms, with or without 6274246Sae * modification, are permitted provided that the following conditions 7274246Sae * are met: 8274246Sae * 9274246Sae * 1. Redistributions of source code must retain the above copyright 10274246Sae * notice, this list of conditions and the following disclaimer. 11274246Sae * 2. Redistributions in binary form must reproduce the above copyright 12274246Sae * notice, this list of conditions and the following disclaimer in the 13274246Sae * documentation and/or other materials provided with the distribution. 14274246Sae * 15274246Sae * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16274246Sae * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17274246Sae * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18274246Sae * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19274246Sae * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20274246Sae * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21274246Sae * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22274246Sae * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23274246Sae * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24274246Sae * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25274246Sae */ 26274246Sae 27274246Sae#include <sys/cdefs.h> 28274246Sae__FBSDID("$FreeBSD$"); 29274246Sae 30274246Sae#include "opt_inet.h" 31274246Sae#include "opt_inet6.h" 32274246Sae 33274246Sae#include <sys/param.h> 34274246Sae#include <sys/lock.h> 35274246Sae#include <sys/rmlock.h> 36274246Sae#include <sys/systm.h> 37274246Sae#include <sys/socket.h> 38274246Sae#include <sys/sockio.h> 39274246Sae#include <sys/mbuf.h> 40274246Sae#include <sys/errno.h> 41274246Sae#include <sys/kernel.h> 42274246Sae#include <sys/queue.h> 43274246Sae#include <sys/syslog.h> 44274246Sae#include <sys/sysctl.h> 45274246Sae#include <sys/protosw.h> 46274246Sae#include <sys/malloc.h> 47274246Sae 48274246Sae#include <net/if.h> 49274246Sae#include <net/if_var.h> 50274246Sae#include <net/vnet.h> 51274246Sae 52274246Sae#include <netinet/in.h> 53274246Sae#include <netinet/in_systm.h> 54274246Sae#ifdef INET 55274246Sae#include <net/ethernet.h> 56274246Sae#include <netinet/ip.h> 57274246Sae#endif 58274246Sae#include <netinet/ip_encap.h> 59274246Sae#include <netinet/ip6.h> 60284066Sae#include <netinet6/ip6protosw.h> 61274246Sae#include <netinet6/ip6_var.h> 62274246Sae#include <netinet6/in6_var.h> 63274246Sae#include <net/if_gre.h> 64274246Sae 65274246Saeextern struct domain inet6domain; 66284066Saestruct ip6protosw in6_gre_protosw = { 67274246Sae .pr_type = SOCK_RAW, 68274246Sae .pr_domain = &inet6domain, 69274246Sae .pr_protocol = IPPROTO_GRE, 70274246Sae .pr_flags = PR_ATOMIC|PR_ADDR, 71274246Sae .pr_input = gre_input, 72274246Sae .pr_output = rip6_output, 73274246Sae .pr_ctloutput = rip6_ctloutput, 74274246Sae .pr_usrreqs = &rip6_usrreqs 75274246Sae}; 76274246Sae 77274246SaeVNET_DEFINE(int, ip6_gre_hlim) = IPV6_DEFHLIM; 78274246Sae#define V_ip6_gre_hlim VNET(ip6_gre_hlim) 79274246Sae 80274246SaeSYSCTL_DECL(_net_inet6_ip6); 81274246SaeSYSCTL_INT(_net_inet6_ip6, OID_AUTO, grehlim, CTLFLAG_VNET | CTLFLAG_RW, 82274246Sae &VNET_NAME(ip6_gre_hlim), 0, "Default hop limit for encapsulated packets"); 83274246Sae 84274246Saestatic int 85274246Saein6_gre_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 86274246Sae{ 87274246Sae GRE_RLOCK_TRACKER; 88274246Sae struct gre_softc *sc; 89274246Sae struct ip6_hdr *ip6; 90274246Sae 91274246Sae sc = (struct gre_softc *)arg; 92274246Sae if ((GRE2IFP(sc)->if_flags & IFF_UP) == 0) 93274246Sae return (0); 94274246Sae 95274246Sae M_ASSERTPKTHDR(m); 96274246Sae /* 97274246Sae * We expect that payload contains at least IPv4 98274246Sae * or IPv6 packet. 99274246Sae */ 100274246Sae if (m->m_pkthdr.len < sizeof(struct greip6) + 101274246Sae#ifdef INET 102274246Sae sizeof(struct ip)) 103274246Sae#else 104274246Sae sizeof(struct ip6_hdr)) 105274246Sae#endif 106274246Sae return (0); 107274246Sae 108274246Sae GRE_RLOCK(sc); 109274246Sae if (sc->gre_family == 0) 110274246Sae goto bad; 111274246Sae 112274246Sae KASSERT(sc->gre_family == AF_INET6, 113274246Sae ("wrong gre_family: %d", sc->gre_family)); 114274246Sae 115274246Sae ip6 = mtod(m, struct ip6_hdr *); 116274246Sae if (!IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_src, &ip6->ip6_dst) || 117274246Sae !IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_dst, &ip6->ip6_src)) 118274246Sae goto bad; 119274246Sae 120274246Sae GRE_RUNLOCK(sc); 121274246Sae return (128 * 2); 122274246Saebad: 123274246Sae GRE_RUNLOCK(sc); 124274246Sae return (0); 125274246Sae} 126274246Sae 127274246Saeint 128274246Saein6_gre_output(struct mbuf *m, int af, int hlen) 129274246Sae{ 130274246Sae struct greip6 *gi6; 131274246Sae 132274246Sae gi6 = mtod(m, struct greip6 *); 133274246Sae gi6->gi6_ip6.ip6_hlim = V_ip6_gre_hlim; 134274246Sae return (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, NULL)); 135274246Sae} 136274246Sae 137274246Saeint 138274246Saein6_gre_attach(struct gre_softc *sc) 139274246Sae{ 140274246Sae 141274246Sae KASSERT(sc->gre_ecookie == NULL, ("gre_ecookie isn't NULL")); 142274246Sae sc->gre_ecookie = encap_attach_func(AF_INET6, IPPROTO_GRE, 143284066Sae in6_gre_encapcheck, (void *)&in6_gre_protosw, sc); 144274246Sae if (sc->gre_ecookie == NULL) 145274246Sae return (EEXIST); 146274246Sae return (0); 147274246Sae} 148