596 lines
16 KiB
C
596 lines
16 KiB
C
/*-
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* Copyright (c) 2014, 2018 Andrey V. Elsukov <ae@FreeBSD.org>
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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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*
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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/jail.h>
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#include <sys/systm.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sockio.h>
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#include <sys/mbuf.h>
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#include <sys/errno.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/malloc.h>
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#include <sys/proc.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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#ifdef INET
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#include <net/ethernet.h>
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#include <netinet/ip.h>
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#endif
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#include <netinet/in_pcb.h>
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#include <netinet/ip_encap.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip6.h>
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#include <netinet/udp.h>
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#include <netinet/udp_var.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/in6_var.h>
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#include <netinet6/scope6_var.h>
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#include <net/if_gre.h>
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VNET_DEFINE(int, ip6_gre_hlim) = IPV6_DEFHLIM;
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#define V_ip6_gre_hlim VNET(ip6_gre_hlim)
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SYSCTL_DECL(_net_inet6_ip6);
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SYSCTL_INT(_net_inet6_ip6, OID_AUTO, grehlim, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(ip6_gre_hlim), 0, "Default hop limit for encapsulated packets");
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struct in6_gre_socket {
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struct gre_socket base;
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struct in6_addr addr; /* scope zone id is embedded */
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};
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VNET_DEFINE_STATIC(struct gre_sockets *, ipv6_sockets) = NULL;
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VNET_DEFINE_STATIC(struct gre_list *, ipv6_hashtbl) = NULL;
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VNET_DEFINE_STATIC(struct gre_list *, ipv6_srchashtbl) = NULL;
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#define V_ipv6_sockets VNET(ipv6_sockets)
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#define V_ipv6_hashtbl VNET(ipv6_hashtbl)
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#define V_ipv6_srchashtbl VNET(ipv6_srchashtbl)
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#define GRE_HASH(src, dst) (V_ipv6_hashtbl[\
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in6_gre_hashval((src), (dst)) & (GRE_HASH_SIZE - 1)])
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#define GRE_SRCHASH(src) (V_ipv6_srchashtbl[\
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fnv_32_buf((src), sizeof(*src), FNV1_32_INIT) & (GRE_HASH_SIZE - 1)])
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#define GRE_SOCKHASH(src) (V_ipv6_sockets[\
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fnv_32_buf((src), sizeof(*src), FNV1_32_INIT) & (GRE_HASH_SIZE - 1)])
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#define GRE_HASH_SC(sc) GRE_HASH(&(sc)->gre_oip6.ip6_src,\
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&(sc)->gre_oip6.ip6_dst)
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static uint32_t
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in6_gre_hashval(const struct in6_addr *src, const struct in6_addr *dst)
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{
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uint32_t ret;
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ret = fnv_32_buf(src, sizeof(*src), FNV1_32_INIT);
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return (fnv_32_buf(dst, sizeof(*dst), ret));
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}
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static struct gre_socket*
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in6_gre_lookup_socket(const struct in6_addr *addr)
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{
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struct gre_socket *gs;
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struct in6_gre_socket *s;
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CK_LIST_FOREACH(gs, &GRE_SOCKHASH(addr), chain) {
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s = __containerof(gs, struct in6_gre_socket, base);
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if (IN6_ARE_ADDR_EQUAL(&s->addr, addr))
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break;
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}
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return (gs);
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}
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static int
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in6_gre_checkdup(const struct gre_softc *sc, const struct in6_addr *src,
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const struct in6_addr *dst, uint32_t opts)
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{
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struct gre_list *head;
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struct gre_softc *tmp;
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struct gre_socket *gs;
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if (sc->gre_family == AF_INET6 &&
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IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_src, src) &&
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IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_dst, dst) &&
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(sc->gre_options & GRE_UDPENCAP) == (opts & GRE_UDPENCAP))
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return (EEXIST);
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if (opts & GRE_UDPENCAP) {
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gs = in6_gre_lookup_socket(src);
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if (gs == NULL)
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return (0);
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head = &gs->list;
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} else
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head = &GRE_HASH(src, dst);
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CK_LIST_FOREACH(tmp, head, chain) {
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if (tmp == sc)
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continue;
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if (IN6_ARE_ADDR_EQUAL(&tmp->gre_oip6.ip6_src, src) &&
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IN6_ARE_ADDR_EQUAL(&tmp->gre_oip6.ip6_dst, dst))
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return (EADDRNOTAVAIL);
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}
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return (0);
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}
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static int
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in6_gre_lookup(const struct mbuf *m, int off, int proto, void **arg)
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{
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const struct ip6_hdr *ip6;
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struct gre_softc *sc;
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if (V_ipv6_hashtbl == NULL)
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return (0);
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NET_EPOCH_ASSERT();
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ip6 = mtod(m, const struct ip6_hdr *);
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CK_LIST_FOREACH(sc, &GRE_HASH(&ip6->ip6_dst, &ip6->ip6_src), chain) {
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/*
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* This is an inbound packet, its ip6_dst is source address
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* in softc.
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*/
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if (IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_src,
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&ip6->ip6_dst) &&
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IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_dst,
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&ip6->ip6_src)) {
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if ((GRE2IFP(sc)->if_flags & IFF_UP) == 0)
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return (0);
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*arg = sc;
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return (ENCAP_DRV_LOOKUP);
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}
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}
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return (0);
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}
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/*
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* Check that ingress address belongs to local host.
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*/
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static void
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in6_gre_set_running(struct gre_softc *sc)
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{
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if (in6_localip(&sc->gre_oip6.ip6_src))
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GRE2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING;
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else
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GRE2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
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}
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/*
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* ifaddr_event handler.
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* Clear IFF_DRV_RUNNING flag when ingress address disappears to prevent
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* source address spoofing.
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*/
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static void
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in6_gre_srcaddr(void *arg __unused, const struct sockaddr *sa,
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int event __unused)
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{
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const struct sockaddr_in6 *sin;
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struct gre_softc *sc;
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/* Check that VNET is ready */
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if (V_ipv6_hashtbl == NULL)
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return;
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NET_EPOCH_ASSERT();
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sin = (const struct sockaddr_in6 *)sa;
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CK_LIST_FOREACH(sc, &GRE_SRCHASH(&sin->sin6_addr), srchash) {
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if (IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_src,
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&sin->sin6_addr) == 0)
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continue;
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in6_gre_set_running(sc);
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}
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}
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static void
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in6_gre_udp_input(struct mbuf *m, int off, struct inpcb *inp,
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const struct sockaddr *sa, void *ctx)
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{
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struct epoch_tracker et;
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struct gre_socket *gs;
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struct gre_softc *sc;
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struct sockaddr_in6 dst;
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NET_EPOCH_ENTER(et);
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/*
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* udp_append() holds reference to inp, it is safe to check
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* inp_flags2 without INP_RLOCK().
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* If socket was closed before we have entered NET_EPOCH section,
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* INP_FREED flag should be set. Otherwise it should be safe to
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* make access to ctx data, because gre_so will be freed by
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* gre_sofree() via epoch_call().
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*/
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if (__predict_false(inp->inp_flags2 & INP_FREED)) {
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NET_EPOCH_EXIT(et);
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m_freem(m);
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return;
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}
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gs = (struct gre_socket *)ctx;
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dst = *(const struct sockaddr_in6 *)sa;
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if (sa6_embedscope(&dst, 0)) {
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NET_EPOCH_EXIT(et);
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m_freem(m);
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return;
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}
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CK_LIST_FOREACH(sc, &gs->list, chain) {
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if (IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_dst, &dst.sin6_addr))
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break;
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}
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if (sc != NULL && (GRE2IFP(sc)->if_flags & IFF_UP) != 0){
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gre_input(m, off + sizeof(struct udphdr), IPPROTO_UDP, sc);
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NET_EPOCH_EXIT(et);
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return;
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}
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m_freem(m);
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NET_EPOCH_EXIT(et);
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}
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static int
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in6_gre_setup_socket(struct gre_softc *sc)
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{
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struct sockopt sopt;
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struct sockaddr_in6 sin6;
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struct in6_gre_socket *s;
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struct gre_socket *gs;
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int error, value;
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/*
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* NOTE: we are protected with gre_ioctl_sx lock.
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*
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* First check that socket is already configured.
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* If so, check that source addres was not changed.
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* If address is different, check that there are no other tunnels
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* and close socket.
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*/
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gs = sc->gre_so;
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if (gs != NULL) {
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s = __containerof(gs, struct in6_gre_socket, base);
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if (!IN6_ARE_ADDR_EQUAL(&s->addr, &sc->gre_oip6.ip6_src)) {
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if (CK_LIST_EMPTY(&gs->list)) {
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CK_LIST_REMOVE(gs, chain);
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soclose(gs->so);
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epoch_call(net_epoch_preempt, &gs->epoch_ctx,
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gre_sofree);
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}
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gs = sc->gre_so = NULL;
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}
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}
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if (gs == NULL) {
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/*
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* Check that socket for given address is already
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* configured.
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*/
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gs = in6_gre_lookup_socket(&sc->gre_oip6.ip6_src);
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if (gs == NULL) {
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s = malloc(sizeof(*s), M_GRE, M_WAITOK | M_ZERO);
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s->addr = sc->gre_oip6.ip6_src;
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gs = &s->base;
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error = socreate(sc->gre_family, &gs->so,
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SOCK_DGRAM, IPPROTO_UDP, curthread->td_ucred,
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curthread);
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if (error != 0) {
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if_printf(GRE2IFP(sc),
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"cannot create socket: %d\n", error);
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free(s, M_GRE);
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return (error);
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}
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error = udp_set_kernel_tunneling(gs->so,
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in6_gre_udp_input, NULL, gs);
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if (error != 0) {
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if_printf(GRE2IFP(sc),
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"cannot set UDP tunneling: %d\n", error);
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goto fail;
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}
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memset(&sopt, 0, sizeof(sopt));
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sopt.sopt_dir = SOPT_SET;
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sopt.sopt_level = IPPROTO_IPV6;
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sopt.sopt_name = IPV6_BINDANY;
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sopt.sopt_val = &value;
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sopt.sopt_valsize = sizeof(value);
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value = 1;
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error = sosetopt(gs->so, &sopt);
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if (error != 0) {
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if_printf(GRE2IFP(sc),
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"cannot set IPV6_BINDANY opt: %d\n",
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error);
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goto fail;
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}
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memset(&sin6, 0, sizeof(sin6));
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sin6.sin6_family = AF_INET6;
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sin6.sin6_len = sizeof(sin6);
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sin6.sin6_addr = sc->gre_oip6.ip6_src;
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sin6.sin6_port = htons(GRE_UDPPORT);
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error = sa6_recoverscope(&sin6);
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if (error != 0) {
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if_printf(GRE2IFP(sc),
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"cannot determine scope zone id: %d\n",
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error);
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goto fail;
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}
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error = sobind(gs->so, (struct sockaddr *)&sin6,
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curthread);
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if (error != 0) {
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if_printf(GRE2IFP(sc),
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"cannot bind socket: %d\n", error);
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goto fail;
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}
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/* Add socket to the chain */
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CK_LIST_INSERT_HEAD(
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&GRE_SOCKHASH(&sc->gre_oip6.ip6_src), gs, chain);
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}
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}
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/* Add softc to the socket's list */
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CK_LIST_INSERT_HEAD(&gs->list, sc, chain);
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sc->gre_so = gs;
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return (0);
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fail:
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soclose(gs->so);
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free(s, M_GRE);
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return (error);
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}
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static int
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in6_gre_attach(struct gre_softc *sc)
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{
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struct grehdr *gh;
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int error;
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if (sc->gre_options & GRE_UDPENCAP) {
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sc->gre_csumflags = CSUM_UDP_IPV6;
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sc->gre_hlen = sizeof(struct greudp6);
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sc->gre_oip6.ip6_nxt = IPPROTO_UDP;
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gh = &sc->gre_udp6hdr->gi6_gre;
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gre_update_udphdr(sc, &sc->gre_udp6,
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in6_cksum_pseudo(&sc->gre_oip6, 0, 0, 0));
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} else {
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sc->gre_hlen = sizeof(struct greip6);
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sc->gre_oip6.ip6_nxt = IPPROTO_GRE;
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gh = &sc->gre_ip6hdr->gi6_gre;
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}
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sc->gre_oip6.ip6_vfc = IPV6_VERSION;
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gre_update_hdr(sc, gh);
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/*
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* If we return error, this means that sc is not linked,
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* and caller should reset gre_family and free(sc->gre_hdr).
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*/
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if (sc->gre_options & GRE_UDPENCAP) {
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error = in6_gre_setup_socket(sc);
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if (error != 0)
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return (error);
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} else
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CK_LIST_INSERT_HEAD(&GRE_HASH_SC(sc), sc, chain);
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CK_LIST_INSERT_HEAD(&GRE_SRCHASH(&sc->gre_oip6.ip6_src), sc, srchash);
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/* Set IFF_DRV_RUNNING if interface is ready */
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in6_gre_set_running(sc);
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return (0);
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}
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int
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in6_gre_setopts(struct gre_softc *sc, u_long cmd, uint32_t value)
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{
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int error;
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/* NOTE: we are protected with gre_ioctl_sx lock */
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MPASS(cmd == GRESKEY || cmd == GRESOPTS || cmd == GRESPORT);
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MPASS(sc->gre_family == AF_INET6);
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/*
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* If we are going to change encapsulation protocol, do check
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* for duplicate tunnels. Return EEXIST here to do not confuse
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* user.
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*/
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if (cmd == GRESOPTS &&
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(sc->gre_options & GRE_UDPENCAP) != (value & GRE_UDPENCAP) &&
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in6_gre_checkdup(sc, &sc->gre_oip6.ip6_src,
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&sc->gre_oip6.ip6_dst, value) == EADDRNOTAVAIL)
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return (EEXIST);
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CK_LIST_REMOVE(sc, chain);
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CK_LIST_REMOVE(sc, srchash);
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GRE_WAIT();
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switch (cmd) {
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case GRESKEY:
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sc->gre_key = value;
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break;
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case GRESOPTS:
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sc->gre_options = value;
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break;
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case GRESPORT:
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sc->gre_port = value;
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break;
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}
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error = in6_gre_attach(sc);
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if (error != 0) {
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sc->gre_family = 0;
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free(sc->gre_hdr, M_GRE);
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}
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return (error);
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}
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int
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in6_gre_ioctl(struct gre_softc *sc, u_long cmd, caddr_t data)
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{
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struct in6_ifreq *ifr = (struct in6_ifreq *)data;
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struct sockaddr_in6 *dst, *src;
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struct ip6_hdr *ip6;
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int error;
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/* NOTE: we are protected with gre_ioctl_sx lock */
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error = EINVAL;
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switch (cmd) {
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case SIOCSIFPHYADDR_IN6:
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src = &((struct in6_aliasreq *)data)->ifra_addr;
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dst = &((struct in6_aliasreq *)data)->ifra_dstaddr;
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/* sanity checks */
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if (src->sin6_family != dst->sin6_family ||
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src->sin6_family != AF_INET6 ||
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src->sin6_len != dst->sin6_len ||
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src->sin6_len != sizeof(*src))
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break;
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if (IN6_IS_ADDR_UNSPECIFIED(&src->sin6_addr) ||
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IN6_IS_ADDR_UNSPECIFIED(&dst->sin6_addr)) {
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error = EADDRNOTAVAIL;
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|
break;
|
|
}
|
|
/*
|
|
* Check validity of the scope zone ID of the
|
|
* addresses, and convert it into the kernel
|
|
* internal form if necessary.
|
|
*/
|
|
if ((error = sa6_embedscope(src, 0)) != 0 ||
|
|
(error = sa6_embedscope(dst, 0)) != 0)
|
|
break;
|
|
|
|
if (V_ipv6_hashtbl == NULL) {
|
|
V_ipv6_hashtbl = gre_hashinit();
|
|
V_ipv6_srchashtbl = gre_hashinit();
|
|
V_ipv6_sockets = (struct gre_sockets *)gre_hashinit();
|
|
}
|
|
error = in6_gre_checkdup(sc, &src->sin6_addr,
|
|
&dst->sin6_addr, sc->gre_options);
|
|
if (error == EADDRNOTAVAIL)
|
|
break;
|
|
if (error == EEXIST) {
|
|
/* Addresses are the same. Just return. */
|
|
error = 0;
|
|
break;
|
|
}
|
|
ip6 = malloc(sizeof(struct greudp6) + 3 * sizeof(uint32_t),
|
|
M_GRE, M_WAITOK | M_ZERO);
|
|
ip6->ip6_src = src->sin6_addr;
|
|
ip6->ip6_dst = dst->sin6_addr;
|
|
if (sc->gre_family != 0) {
|
|
/* Detach existing tunnel first */
|
|
CK_LIST_REMOVE(sc, chain);
|
|
CK_LIST_REMOVE(sc, srchash);
|
|
GRE_WAIT();
|
|
free(sc->gre_hdr, M_GRE);
|
|
/* XXX: should we notify about link state change? */
|
|
}
|
|
sc->gre_family = AF_INET6;
|
|
sc->gre_hdr = ip6;
|
|
sc->gre_oseq = 0;
|
|
sc->gre_iseq = UINT32_MAX;
|
|
error = in6_gre_attach(sc);
|
|
if (error != 0) {
|
|
sc->gre_family = 0;
|
|
free(sc->gre_hdr, M_GRE);
|
|
}
|
|
break;
|
|
case SIOCGIFPSRCADDR_IN6:
|
|
case SIOCGIFPDSTADDR_IN6:
|
|
if (sc->gre_family != AF_INET6) {
|
|
error = EADDRNOTAVAIL;
|
|
break;
|
|
}
|
|
src = (struct sockaddr_in6 *)&ifr->ifr_addr;
|
|
memset(src, 0, sizeof(*src));
|
|
src->sin6_family = AF_INET6;
|
|
src->sin6_len = sizeof(*src);
|
|
src->sin6_addr = (cmd == SIOCGIFPSRCADDR_IN6) ?
|
|
sc->gre_oip6.ip6_src: sc->gre_oip6.ip6_dst;
|
|
error = prison_if(curthread->td_ucred, (struct sockaddr *)src);
|
|
if (error == 0)
|
|
error = sa6_recoverscope(src);
|
|
if (error != 0)
|
|
memset(src, 0, sizeof(*src));
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
in6_gre_output(struct mbuf *m, int af __unused, int hlen __unused,
|
|
uint32_t flowid)
|
|
{
|
|
struct greip6 *gi6;
|
|
|
|
gi6 = mtod(m, struct greip6 *);
|
|
gi6->gi6_ip6.ip6_hlim = V_ip6_gre_hlim;
|
|
gi6->gi6_ip6.ip6_flow |= flowid & IPV6_FLOWLABEL_MASK;
|
|
return (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, NULL));
|
|
}
|
|
|
|
static const struct srcaddrtab *ipv6_srcaddrtab = NULL;
|
|
static const struct encaptab *ecookie = NULL;
|
|
static const struct encap_config ipv6_encap_cfg = {
|
|
.proto = IPPROTO_GRE,
|
|
.min_length = sizeof(struct greip6) +
|
|
#ifdef INET
|
|
sizeof(struct ip),
|
|
#else
|
|
sizeof(struct ip6_hdr),
|
|
#endif
|
|
.exact_match = ENCAP_DRV_LOOKUP,
|
|
.lookup = in6_gre_lookup,
|
|
.input = gre_input
|
|
};
|
|
|
|
void
|
|
in6_gre_init(void)
|
|
{
|
|
|
|
if (!IS_DEFAULT_VNET(curvnet))
|
|
return;
|
|
ipv6_srcaddrtab = ip6_encap_register_srcaddr(in6_gre_srcaddr,
|
|
NULL, M_WAITOK);
|
|
ecookie = ip6_encap_attach(&ipv6_encap_cfg, NULL, M_WAITOK);
|
|
}
|
|
|
|
void
|
|
in6_gre_uninit(void)
|
|
{
|
|
|
|
if (IS_DEFAULT_VNET(curvnet)) {
|
|
ip6_encap_detach(ecookie);
|
|
ip6_encap_unregister_srcaddr(ipv6_srcaddrtab);
|
|
}
|
|
if (V_ipv6_hashtbl != NULL) {
|
|
gre_hashdestroy(V_ipv6_hashtbl);
|
|
V_ipv6_hashtbl = NULL;
|
|
GRE_WAIT();
|
|
gre_hashdestroy(V_ipv6_srchashtbl);
|
|
gre_hashdestroy((struct gre_list *)V_ipv6_sockets);
|
|
}
|
|
}
|