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461 lines
12 KiB
C
461 lines
12 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* Copyright (c) 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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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 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/jail.h>
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#include <sys/socket.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/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/route.h>
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#include <net/vnet.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/in_var.h>
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#include <netinet/ip_encap.h>
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#include <netinet/ip_ecn.h>
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#include <netinet/in_fib.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_gif.h>
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#define GIF_TTL 30
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VNET_DEFINE_STATIC(int, ip_gif_ttl) = GIF_TTL;
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#define V_ip_gif_ttl VNET(ip_gif_ttl)
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SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(ip_gif_ttl), 0, "Default TTL value for encapsulated packets");
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/*
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* We keep interfaces in a hash table using src+dst as key.
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* Interfaces with GIF_IGNORE_SOURCE flag are linked into plain list.
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*/
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VNET_DEFINE_STATIC(struct gif_list *, ipv4_hashtbl) = NULL;
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VNET_DEFINE_STATIC(struct gif_list *, ipv4_srchashtbl) = NULL;
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VNET_DEFINE_STATIC(struct gif_list, ipv4_list) = CK_LIST_HEAD_INITIALIZER();
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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 V_ipv4_list VNET(ipv4_list)
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#define GIF_HASH(src, dst) (V_ipv4_hashtbl[\
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in_gif_hashval((src), (dst)) & (GIF_HASH_SIZE - 1)])
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#define GIF_SRCHASH(src) (V_ipv4_srchashtbl[\
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fnv_32_buf(&(src), sizeof(src), FNV1_32_INIT) & (GIF_HASH_SIZE - 1)])
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#define GIF_HASH_SC(sc) GIF_HASH((sc)->gif_iphdr->ip_src.s_addr,\
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(sc)->gif_iphdr->ip_dst.s_addr)
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static uint32_t
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in_gif_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 int
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in_gif_checkdup(const struct gif_softc *sc, in_addr_t src, in_addr_t dst)
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{
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struct gif_softc *tmp;
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if (sc->gif_family == AF_INET &&
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sc->gif_iphdr->ip_src.s_addr == src &&
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sc->gif_iphdr->ip_dst.s_addr == dst)
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return (EEXIST);
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CK_LIST_FOREACH(tmp, &GIF_HASH(src, dst), chain) {
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if (tmp == sc)
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continue;
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if (tmp->gif_iphdr->ip_src.s_addr == src &&
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tmp->gif_iphdr->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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/*
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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_gif_set_running(struct gif_softc *sc)
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{
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if (in_localip(sc->gif_iphdr->ip_src))
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GIF2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING;
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else
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GIF2IFP(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_gif_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 gif_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, &GIF_SRCHASH(sin->sin_addr.s_addr), srchash) {
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if (sc->gif_iphdr->ip_src.s_addr != sin->sin_addr.s_addr)
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continue;
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in_gif_set_running(sc);
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}
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}
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static void
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in_gif_attach(struct gif_softc *sc)
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{
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if (sc->gif_options & GIF_IGNORE_SOURCE)
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CK_LIST_INSERT_HEAD(&V_ipv4_list, sc, chain);
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else
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CK_LIST_INSERT_HEAD(&GIF_HASH_SC(sc), sc, chain);
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CK_LIST_INSERT_HEAD(&GIF_SRCHASH(sc->gif_iphdr->ip_src.s_addr),
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sc, srchash);
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}
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int
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in_gif_setopts(struct gif_softc *sc, u_int options)
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{
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/* NOTE: we are protected with gif_ioctl_sx lock */
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MPASS(sc->gif_family == AF_INET);
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MPASS(sc->gif_options != options);
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if ((options & GIF_IGNORE_SOURCE) !=
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(sc->gif_options & GIF_IGNORE_SOURCE)) {
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CK_LIST_REMOVE(sc, srchash);
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CK_LIST_REMOVE(sc, chain);
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sc->gif_options = options;
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in_gif_attach(sc);
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}
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return (0);
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}
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int
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in_gif_ioctl(struct gif_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 gif_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 = gif_hashinit();
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V_ipv4_srchashtbl = gif_hashinit();
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}
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error = in_gif_checkdup(sc, src->sin_addr.s_addr,
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dst->sin_addr.s_addr);
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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(*ip), M_GIF, M_WAITOK | M_ZERO);
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ip->ip_src.s_addr = src->sin_addr.s_addr;
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ip->ip_dst.s_addr = dst->sin_addr.s_addr;
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if (sc->gif_family != 0) {
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/* Detach existing tunnel first */
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CK_LIST_REMOVE(sc, srchash);
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CK_LIST_REMOVE(sc, chain);
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GIF_WAIT();
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free(sc->gif_hdr, M_GIF);
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/* XXX: should we notify about link state change? */
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}
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sc->gif_family = AF_INET;
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sc->gif_iphdr = ip;
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in_gif_attach(sc);
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in_gif_set_running(sc);
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break;
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case SIOCGIFPSRCADDR:
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case SIOCGIFPDSTADDR:
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if (sc->gif_family != AF_INET) {
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error = EADDRNOTAVAIL;
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break;
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}
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src = (struct sockaddr_in *)&ifr->ifr_addr;
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memset(src, 0, sizeof(*src));
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src->sin_family = AF_INET;
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src->sin_len = sizeof(*src);
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src->sin_addr = (cmd == SIOCGIFPSRCADDR) ?
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sc->gif_iphdr->ip_src: sc->gif_iphdr->ip_dst;
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error = prison_if(curthread->td_ucred, (struct sockaddr *)src);
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if (error != 0)
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memset(src, 0, sizeof(*src));
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break;
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}
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return (error);
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}
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int
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in_gif_output(struct ifnet *ifp, struct mbuf *m, int proto, uint8_t ecn)
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{
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struct gif_softc *sc = ifp->if_softc;
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struct ip *ip;
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int len;
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/* prepend new IP header */
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NET_EPOCH_ASSERT();
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len = sizeof(struct ip);
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#ifndef __NO_STRICT_ALIGNMENT
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if (proto == IPPROTO_ETHERIP)
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len += ETHERIP_ALIGN;
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#endif
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M_PREPEND(m, len, M_NOWAIT);
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if (m == NULL)
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return (ENOBUFS);
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#ifndef __NO_STRICT_ALIGNMENT
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if (proto == IPPROTO_ETHERIP) {
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len = mtod(m, vm_offset_t) & 3;
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KASSERT(len == 0 || len == ETHERIP_ALIGN,
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("in_gif_output: unexpected misalignment"));
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m->m_data += len;
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m->m_len -= ETHERIP_ALIGN;
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}
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#endif
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ip = mtod(m, struct ip *);
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MPASS(sc->gif_family == AF_INET);
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bcopy(sc->gif_iphdr, ip, sizeof(struct ip));
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ip->ip_p = proto;
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/* version will be set in ip_output() */
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ip->ip_ttl = V_ip_gif_ttl;
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ip->ip_len = htons(m->m_pkthdr.len);
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ip->ip_tos = ecn;
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return (ip_output(m, NULL, NULL, 0, NULL, NULL));
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}
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static int
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in_gif_input(struct mbuf *m, int off, int proto, void *arg)
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{
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struct gif_softc *sc = arg;
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struct ifnet *gifp;
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struct ip *ip;
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uint8_t ecn;
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NET_EPOCH_ASSERT();
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if (sc == NULL) {
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m_freem(m);
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KMOD_IPSTAT_INC(ips_nogif);
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return (IPPROTO_DONE);
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}
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gifp = GIF2IFP(sc);
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if ((gifp->if_flags & IFF_UP) != 0) {
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ip = mtod(m, struct ip *);
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ecn = ip->ip_tos;
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m_adj(m, off);
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gif_input(m, gifp, proto, ecn);
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} else {
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m_freem(m);
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KMOD_IPSTAT_INC(ips_nogif);
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}
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return (IPPROTO_DONE);
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}
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static int
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in_gif_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 gif_softc *sc;
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int ret;
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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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/*
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* NOTE: it is safe to iterate without any locking here, because softc
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* can be reclaimed only when we are not within net_epoch_preempt
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* section, but ip_encap lookup+input are executed in epoch section.
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*/
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ret = 0;
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CK_LIST_FOREACH(sc, &GIF_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->gif_iphdr->ip_src.s_addr == ip->ip_dst.s_addr &&
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sc->gif_iphdr->ip_dst.s_addr == ip->ip_src.s_addr) {
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ret = ENCAP_DRV_LOOKUP;
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goto done;
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}
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}
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/*
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* No exact match.
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* Check the list of interfaces with GIF_IGNORE_SOURCE flag.
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*/
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CK_LIST_FOREACH(sc, &V_ipv4_list, chain) {
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if (sc->gif_iphdr->ip_src.s_addr == ip->ip_dst.s_addr) {
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ret = 32 + 8; /* src + proto */
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goto done;
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}
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}
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return (0);
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done:
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if ((GIF2IFP(sc)->if_flags & IFF_UP) == 0)
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return (0);
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/* ingress filters on outer source */
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if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0) {
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if (fib4_check_urpf(sc->gif_fibnum, ip->ip_src, 0, NHR_NONE,
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m->m_pkthdr.rcvif) == 0)
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return (0);
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}
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*arg = sc;
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return (ret);
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}
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static const struct srcaddrtab *ipv4_srcaddrtab;
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static struct {
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const struct encap_config encap;
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const struct encaptab *cookie;
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} ipv4_encap_cfg[] = {
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{
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.encap = {
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.proto = IPPROTO_IPV4,
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.min_length = 2 * sizeof(struct ip),
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.exact_match = ENCAP_DRV_LOOKUP,
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.lookup = in_gif_lookup,
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.input = in_gif_input
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},
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},
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#ifdef INET6
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{
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.encap = {
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.proto = IPPROTO_IPV6,
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.min_length = sizeof(struct ip) +
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sizeof(struct ip6_hdr),
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.exact_match = ENCAP_DRV_LOOKUP,
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.lookup = in_gif_lookup,
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.input = in_gif_input
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},
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},
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#endif
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{
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.encap = {
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.proto = IPPROTO_ETHERIP,
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.min_length = sizeof(struct ip) +
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sizeof(struct etherip_header) +
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sizeof(struct ether_header),
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.exact_match = ENCAP_DRV_LOOKUP,
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.lookup = in_gif_lookup,
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.input = in_gif_input
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},
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}
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};
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void
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in_gif_init(void)
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{
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int i;
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if (!IS_DEFAULT_VNET(curvnet))
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return;
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ipv4_srcaddrtab = ip_encap_register_srcaddr(in_gif_srcaddr,
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NULL, M_WAITOK);
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for (i = 0; i < nitems(ipv4_encap_cfg); i++)
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ipv4_encap_cfg[i].cookie = ip_encap_attach(
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&ipv4_encap_cfg[i].encap, NULL, M_WAITOK);
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}
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void
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in_gif_uninit(void)
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{
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int i;
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if (IS_DEFAULT_VNET(curvnet)) {
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for (i = 0; i < nitems(ipv4_encap_cfg); i++)
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ip_encap_detach(ipv4_encap_cfg[i].cookie);
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ip_encap_unregister_srcaddr(ipv4_srcaddrtab);
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}
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if (V_ipv4_hashtbl != NULL) {
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gif_hashdestroy(V_ipv4_hashtbl);
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V_ipv4_hashtbl = NULL;
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GIF_WAIT();
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gif_hashdestroy(V_ipv4_srchashtbl);
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}
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}
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