Summary: In preparation of making if_t completely opaque outside of the netstack, explicitly include the header. <net/if_var.h> will stop including the header in the future. Sponsored by: Juniper Networks, Inc. Reviewed by: glebius, melifaro Differential Revision: https://reviews.freebsd.org/D38200
585 lines
15 KiB
C
585 lines
15 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, 2018 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/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/if_private.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/in_pcb.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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#include <netinet/udp.h>
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#include <netinet/udp_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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#include <machine/in_cksum.h>
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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, "Default TTL value for encapsulated packets");
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struct in_gre_socket {
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struct gre_socket base;
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in_addr_t addr;
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};
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VNET_DEFINE_STATIC(struct gre_sockets *, ipv4_sockets) = NULL;
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VNET_DEFINE_STATIC(struct gre_list *, ipv4_hashtbl) = NULL;
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VNET_DEFINE_STATIC(struct gre_list *, ipv4_srchashtbl) = NULL;
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#define V_ipv4_sockets VNET(ipv4_sockets)
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#define V_ipv4_hashtbl VNET(ipv4_hashtbl)
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#define V_ipv4_srchashtbl VNET(ipv4_srchashtbl)
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#define GRE_HASH(src, dst) (V_ipv4_hashtbl[\
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in_gre_hashval((src), (dst)) & (GRE_HASH_SIZE - 1)])
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#define GRE_SRCHASH(src) (V_ipv4_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_ipv4_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_oip.ip_src.s_addr,\
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(sc)->gre_oip.ip_dst.s_addr)
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static uint32_t
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in_gre_hashval(in_addr_t src, in_addr_t 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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in_gre_lookup_socket(in_addr_t addr)
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{
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struct gre_socket *gs;
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struct in_gre_socket *s;
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CK_LIST_FOREACH(gs, &GRE_SOCKHASH(addr), chain) {
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s = __containerof(gs, struct in_gre_socket, base);
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if (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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in_gre_checkdup(const struct gre_softc *sc, in_addr_t src, in_addr_t dst,
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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_INET &&
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sc->gre_oip.ip_src.s_addr == src &&
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sc->gre_oip.ip_dst.s_addr == 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 = in_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 (tmp->gre_oip.ip_src.s_addr == src &&
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tmp->gre_oip.ip_dst.s_addr == 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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in_gre_lookup(const struct mbuf *m, int off, int proto, void **arg)
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{
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const struct ip *ip;
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struct gre_softc *sc;
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if (V_ipv4_hashtbl == NULL)
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return (0);
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NET_EPOCH_ASSERT();
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ip = mtod(m, const struct ip *);
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CK_LIST_FOREACH(sc, &GRE_HASH(ip->ip_dst.s_addr,
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ip->ip_src.s_addr), chain) {
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/*
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* This is an inbound packet, its ip_dst is source address
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* in softc.
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*/
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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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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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in_gre_set_running(struct gre_softc *sc)
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{
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if (in_localip(sc->gre_oip.ip_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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in_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_in *sin;
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struct gre_softc *sc;
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/* Check that VNET is ready */
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if (V_ipv4_hashtbl == NULL)
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return;
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NET_EPOCH_ASSERT();
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sin = (const struct sockaddr_in *)sa;
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CK_LIST_FOREACH(sc, &GRE_SRCHASH(sin->sin_addr.s_addr), srchash) {
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if (sc->gre_oip.ip_src.s_addr != sin->sin_addr.s_addr)
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continue;
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in_gre_set_running(sc);
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}
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}
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static bool
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in_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 gre_socket *gs;
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struct gre_softc *sc;
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in_addr_t dst;
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NET_EPOCH_ASSERT();
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gs = (struct gre_socket *)ctx;
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dst = ((const struct sockaddr_in *)sa)->sin_addr.s_addr;
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CK_LIST_FOREACH(sc, &gs->list, chain) {
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if (sc->gre_oip.ip_dst.s_addr == dst)
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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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return (true);
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}
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m_freem(m);
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return (true);
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}
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static int
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in_gre_setup_socket(struct gre_softc *sc)
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{
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struct sockopt sopt;
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struct sockaddr_in sin;
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struct in_gre_socket *s;
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struct gre_socket *gs;
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in_addr_t addr;
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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 address 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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addr = sc->gre_oip.ip_src.s_addr;
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gs = sc->gre_so;
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if (gs != NULL) {
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s = __containerof(gs, struct in_gre_socket, base);
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if (s->addr != addr) {
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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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NET_EPOCH_CALL(gre_sofree, &gs->epoch_ctx);
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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 = in_gre_lookup_socket(addr);
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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 = addr;
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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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in_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_IP;
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sopt.sopt_name = IP_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 IP_BINDANY opt: %d\n", error);
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goto fail;
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}
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memset(&sin, 0, sizeof(sin));
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sin.sin_family = AF_INET;
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sin.sin_len = sizeof(sin);
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sin.sin_addr.s_addr = addr;
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sin.sin_port = htons(GRE_UDPPORT);
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error = sobind(gs->so, (struct sockaddr *)&sin,
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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(&GRE_SOCKHASH(addr), 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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in_gre_attach(struct gre_softc *sc)
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{
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struct epoch_tracker et;
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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;
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sc->gre_hlen = sizeof(struct greudp);
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sc->gre_oip.ip_p = IPPROTO_UDP;
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gh = &sc->gre_udphdr->gi_gre;
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gre_update_udphdr(sc, &sc->gre_udp,
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in_pseudo(sc->gre_oip.ip_src.s_addr,
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sc->gre_oip.ip_dst.s_addr, 0));
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} else {
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sc->gre_hlen = sizeof(struct greip);
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sc->gre_oip.ip_p = IPPROTO_GRE;
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gh = &sc->gre_iphdr->gi_gre;
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}
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sc->gre_oip.ip_v = IPVERSION;
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sc->gre_oip.ip_hl = sizeof(struct ip) >> 2;
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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 = in_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_oip.ip_src.s_addr),
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sc, srchash);
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/* Set IFF_DRV_RUNNING if interface is ready */
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NET_EPOCH_ENTER(et);
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in_gre_set_running(sc);
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NET_EPOCH_EXIT(et);
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return (0);
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}
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int
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in_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_INET);
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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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in_gre_checkdup(sc, sc->gre_oip.ip_src.s_addr,
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sc->gre_oip.ip_dst.s_addr, 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 = in_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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in_gre_ioctl(struct gre_softc *sc, u_long cmd, caddr_t data)
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{
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struct ifreq *ifr = (struct ifreq *)data;
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struct sockaddr_in *dst, *src;
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struct ip *ip;
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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:
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src = &((struct in_aliasreq *)data)->ifra_addr;
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dst = &((struct in_aliasreq *)data)->ifra_dstaddr;
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/* sanity checks */
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if (src->sin_family != dst->sin_family ||
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src->sin_family != AF_INET ||
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src->sin_len != dst->sin_len ||
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src->sin_len != sizeof(*src))
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break;
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if (src->sin_addr.s_addr == INADDR_ANY ||
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dst->sin_addr.s_addr == INADDR_ANY) {
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error = EADDRNOTAVAIL;
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break;
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}
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if (V_ipv4_hashtbl == NULL) {
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V_ipv4_hashtbl = gre_hashinit();
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V_ipv4_srchashtbl = gre_hashinit();
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V_ipv4_sockets = (struct gre_sockets *)gre_hashinit();
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}
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error = in_gre_checkdup(sc, src->sin_addr.s_addr,
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dst->sin_addr.s_addr, sc->gre_options);
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if (error == EADDRNOTAVAIL)
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break;
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if (error == EEXIST) {
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/* Addresses are the same. Just return. */
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error = 0;
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break;
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}
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ip = malloc(sizeof(struct greudp) + 3 * sizeof(uint32_t),
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M_GRE, M_WAITOK | M_ZERO);
|
|
ip->ip_src.s_addr = src->sin_addr.s_addr;
|
|
ip->ip_dst.s_addr = dst->sin_addr.s_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_INET;
|
|
sc->gre_hdr = ip;
|
|
sc->gre_oseq = 0;
|
|
sc->gre_iseq = UINT32_MAX;
|
|
error = in_gre_attach(sc);
|
|
if (error != 0) {
|
|
sc->gre_family = 0;
|
|
free(sc->gre_hdr, M_GRE);
|
|
}
|
|
break;
|
|
case SIOCGIFPSRCADDR:
|
|
case SIOCGIFPDSTADDR:
|
|
if (sc->gre_family != AF_INET) {
|
|
error = EADDRNOTAVAIL;
|
|
break;
|
|
}
|
|
src = (struct sockaddr_in *)&ifr->ifr_addr;
|
|
memset(src, 0, sizeof(*src));
|
|
src->sin_family = AF_INET;
|
|
src->sin_len = sizeof(*src);
|
|
src->sin_addr = (cmd == SIOCGIFPSRCADDR) ?
|
|
sc->gre_oip.ip_src: sc->gre_oip.ip_dst;
|
|
error = prison_if(curthread->td_ucred, (struct sockaddr *)src);
|
|
if (error != 0)
|
|
memset(src, 0, sizeof(*src));
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
in_gre_output(struct mbuf *m, int af, int hlen)
|
|
{
|
|
struct greip *gi;
|
|
|
|
gi = mtod(m, struct greip *);
|
|
switch (af) {
|
|
case AF_INET:
|
|
/*
|
|
* gre_transmit() has used M_PREPEND() that doesn't guarantee
|
|
* m_data is contiguous more than hlen bytes. Use m_copydata()
|
|
* here to avoid m_pullup().
|
|
*/
|
|
m_copydata(m, hlen + offsetof(struct ip, ip_tos),
|
|
sizeof(u_char), &gi->gi_ip.ip_tos);
|
|
m_copydata(m, hlen + offsetof(struct ip, ip_id),
|
|
sizeof(u_short), (caddr_t)&gi->gi_ip.ip_id);
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
gi->gi_ip.ip_tos = 0; /* XXX */
|
|
ip_fillid(&gi->gi_ip);
|
|
break;
|
|
#endif
|
|
}
|
|
gi->gi_ip.ip_ttl = V_ip_gre_ttl;
|
|
gi->gi_ip.ip_len = htons(m->m_pkthdr.len);
|
|
return (ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL));
|
|
}
|
|
|
|
static const struct srcaddrtab *ipv4_srcaddrtab = NULL;
|
|
static const struct encaptab *ecookie = NULL;
|
|
static const struct encap_config ipv4_encap_cfg = {
|
|
.proto = IPPROTO_GRE,
|
|
.min_length = sizeof(struct greip) + sizeof(struct ip),
|
|
.exact_match = ENCAP_DRV_LOOKUP,
|
|
.lookup = in_gre_lookup,
|
|
.input = gre_input
|
|
};
|
|
|
|
void
|
|
in_gre_init(void)
|
|
{
|
|
|
|
if (!IS_DEFAULT_VNET(curvnet))
|
|
return;
|
|
ipv4_srcaddrtab = ip_encap_register_srcaddr(in_gre_srcaddr,
|
|
NULL, M_WAITOK);
|
|
ecookie = ip_encap_attach(&ipv4_encap_cfg, NULL, M_WAITOK);
|
|
}
|
|
|
|
void
|
|
in_gre_uninit(void)
|
|
{
|
|
|
|
if (IS_DEFAULT_VNET(curvnet)) {
|
|
ip_encap_detach(ecookie);
|
|
ip_encap_unregister_srcaddr(ipv4_srcaddrtab);
|
|
}
|
|
if (V_ipv4_hashtbl != NULL) {
|
|
gre_hashdestroy(V_ipv4_hashtbl);
|
|
V_ipv4_hashtbl = NULL;
|
|
GRE_WAIT();
|
|
gre_hashdestroy(V_ipv4_srchashtbl);
|
|
gre_hashdestroy((struct gre_list *)V_ipv4_sockets);
|
|
}
|
|
}
|