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- /*-
- * SPDX-License-Identifier: BSD-3-Clause
- *
- * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
- * Copyright (c) 2018 Andrey V. Elsukov <ae@FreeBSD.org>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the project nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * $KAME: if_gif.c,v 1.87 2001/10/19 08:50:27 itojun Exp $
- */
- #include <sys/cdefs.h>
- #include "opt_inet.h"
- #include "opt_inet6.h"
- #include <sys/param.h>
- #include <sys/systm.h>
- #include <sys/kernel.h>
- #include <sys/lock.h>
- #include <sys/malloc.h>
- #include <sys/mbuf.h>
- #include <sys/module.h>
- #include <sys/rmlock.h>
- #include <sys/socket.h>
- #include <sys/sockio.h>
- #include <sys/sx.h>
- #include <sys/errno.h>
- #include <sys/time.h>
- #include <sys/sysctl.h>
- #include <sys/syslog.h>
- #include <sys/priv.h>
- #include <sys/proc.h>
- #include <sys/conf.h>
- #include <machine/cpu.h>
- #include <net/if.h>
- #include <net/if_var.h>
- #include <net/if_private.h>
- #include <net/if_clone.h>
- #include <net/if_types.h>
- #include <net/netisr.h>
- #include <net/route.h>
- #include <net/bpf.h>
- #include <net/vnet.h>
- #include <netinet/in.h>
- #include <netinet/in_systm.h>
- #include <netinet/ip.h>
- #include <netinet/ip_ecn.h>
- #ifdef INET
- #include <netinet/in_var.h>
- #include <netinet/ip_var.h>
- #endif /* INET */
- #ifdef INET6
- #ifndef INET
- #include <netinet/in.h>
- #endif
- #include <netinet6/in6_var.h>
- #include <netinet/ip6.h>
- #include <netinet6/ip6_ecn.h>
- #include <netinet6/ip6_var.h>
- #endif /* INET6 */
- #include <netinet/ip_encap.h>
- #include <net/ethernet.h>
- #include <net/if_bridgevar.h>
- #include <net/if_gif.h>
- #include <security/mac/mac_framework.h>
- static const char gifname[] = "gif";
- MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface");
- static struct sx gif_ioctl_sx;
- SX_SYSINIT(gif_ioctl_sx, &gif_ioctl_sx, "gif_ioctl");
- void (*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af);
- void (*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af);
- void (*ng_gif_attach_p)(struct ifnet *ifp);
- void (*ng_gif_detach_p)(struct ifnet *ifp);
- #ifdef VIMAGE
- static void gif_reassign(struct ifnet *, struct vnet *, char *);
- #endif
- static void gif_delete_tunnel(struct gif_softc *);
- static int gif_ioctl(struct ifnet *, u_long, caddr_t);
- static int gif_transmit(struct ifnet *, struct mbuf *);
- static void gif_qflush(struct ifnet *);
- static int gif_clone_create(struct if_clone *, int, caddr_t);
- static void gif_clone_destroy(struct ifnet *);
- VNET_DEFINE_STATIC(struct if_clone *, gif_cloner);
- #define V_gif_cloner VNET(gif_cloner)
- SYSCTL_DECL(_net_link);
- static SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
- "Generic Tunnel Interface");
- #ifndef MAX_GIF_NEST
- /*
- * This macro controls the default upper limitation on nesting of gif tunnels.
- * Since, setting a large value to this macro with a careless configuration
- * may introduce system crash, we don't allow any nestings by default.
- * If you need to configure nested gif tunnels, you can define this macro
- * in your kernel configuration file. However, if you do so, please be
- * careful to configure the tunnels so that it won't make a loop.
- */
- #define MAX_GIF_NEST 1
- #endif
- VNET_DEFINE_STATIC(int, max_gif_nesting) = MAX_GIF_NEST;
- #define V_max_gif_nesting VNET(max_gif_nesting)
- SYSCTL_INT(_net_link_gif, OID_AUTO, max_nesting, CTLFLAG_VNET | CTLFLAG_RW,
- &VNET_NAME(max_gif_nesting), 0, "Max nested tunnels");
- static int
- gif_clone_create(struct if_clone *ifc, int unit, caddr_t params)
- {
- struct gif_softc *sc;
- sc = malloc(sizeof(struct gif_softc), M_GIF, M_WAITOK | M_ZERO);
- sc->gif_fibnum = curthread->td_proc->p_fibnum;
- GIF2IFP(sc) = if_alloc(IFT_GIF);
- GIF2IFP(sc)->if_softc = sc;
- if_initname(GIF2IFP(sc), gifname, unit);
- GIF2IFP(sc)->if_addrlen = 0;
- GIF2IFP(sc)->if_mtu = GIF_MTU;
- GIF2IFP(sc)->if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
- GIF2IFP(sc)->if_ioctl = gif_ioctl;
- GIF2IFP(sc)->if_transmit = gif_transmit;
- GIF2IFP(sc)->if_qflush = gif_qflush;
- GIF2IFP(sc)->if_output = gif_output;
- #ifdef VIMAGE
- GIF2IFP(sc)->if_reassign = gif_reassign;
- #endif
- GIF2IFP(sc)->if_capabilities |= IFCAP_LINKSTATE;
- GIF2IFP(sc)->if_capenable |= IFCAP_LINKSTATE;
- if_attach(GIF2IFP(sc));
- bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t));
- if (ng_gif_attach_p != NULL)
- (*ng_gif_attach_p)(GIF2IFP(sc));
- return (0);
- }
- #ifdef VIMAGE
- static void
- gif_reassign(struct ifnet *ifp, struct vnet *new_vnet __unused,
- char *unused __unused)
- {
- struct gif_softc *sc;
- sx_xlock(&gif_ioctl_sx);
- sc = ifp->if_softc;
- if (sc != NULL)
- gif_delete_tunnel(sc);
- sx_xunlock(&gif_ioctl_sx);
- }
- #endif /* VIMAGE */
- static void
- gif_clone_destroy(struct ifnet *ifp)
- {
- struct gif_softc *sc;
- sx_xlock(&gif_ioctl_sx);
- sc = ifp->if_softc;
- gif_delete_tunnel(sc);
- if (ng_gif_detach_p != NULL)
- (*ng_gif_detach_p)(ifp);
- bpfdetach(ifp);
- if_detach(ifp);
- ifp->if_softc = NULL;
- sx_xunlock(&gif_ioctl_sx);
- GIF_WAIT();
- if_free(ifp);
- free(sc, M_GIF);
- }
- static void
- vnet_gif_init(const void *unused __unused)
- {
- V_gif_cloner = if_clone_simple(gifname, gif_clone_create,
- gif_clone_destroy, 0);
- #ifdef INET
- in_gif_init();
- #endif
- #ifdef INET6
- in6_gif_init();
- #endif
- }
- VNET_SYSINIT(vnet_gif_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
- vnet_gif_init, NULL);
- static void
- vnet_gif_uninit(const void *unused __unused)
- {
- if_clone_detach(V_gif_cloner);
- #ifdef INET
- in_gif_uninit();
- #endif
- #ifdef INET6
- in6_gif_uninit();
- #endif
- }
- VNET_SYSUNINIT(vnet_gif_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
- vnet_gif_uninit, NULL);
- static int
- gifmodevent(module_t mod, int type, void *data)
- {
- switch (type) {
- case MOD_LOAD:
- case MOD_UNLOAD:
- break;
- default:
- return (EOPNOTSUPP);
- }
- return (0);
- }
- static moduledata_t gif_mod = {
- "if_gif",
- gifmodevent,
- 0
- };
- DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
- MODULE_VERSION(if_gif, 1);
- struct gif_list *
- gif_hashinit(void)
- {
- struct gif_list *hash;
- int i;
- hash = malloc(sizeof(struct gif_list) * GIF_HASH_SIZE,
- M_GIF, M_WAITOK);
- for (i = 0; i < GIF_HASH_SIZE; i++)
- CK_LIST_INIT(&hash[i]);
- return (hash);
- }
- void
- gif_hashdestroy(struct gif_list *hash)
- {
- free(hash, M_GIF);
- }
- #define MTAG_GIF 1080679712
- static int
- gif_transmit(struct ifnet *ifp, struct mbuf *m)
- {
- struct gif_softc *sc;
- struct etherip_header *eth;
- #ifdef INET
- struct ip *ip;
- #endif
- #ifdef INET6
- struct ip6_hdr *ip6;
- uint32_t t;
- #endif
- uint32_t af;
- uint8_t proto, ecn;
- int error;
- NET_EPOCH_ASSERT();
- #ifdef MAC
- error = mac_ifnet_check_transmit(ifp, m);
- if (error) {
- m_freem(m);
- goto err;
- }
- #endif
- error = ENETDOWN;
- sc = ifp->if_softc;
- if ((ifp->if_flags & IFF_MONITOR) != 0 ||
- (ifp->if_flags & IFF_UP) == 0 ||
- (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
- sc->gif_family == 0 ||
- (error = if_tunnel_check_nesting(ifp, m, MTAG_GIF,
- V_max_gif_nesting)) != 0) {
- m_freem(m);
- goto err;
- }
- /* Now pull back the af that we stashed in the csum_data. */
- if (ifp->if_bridge)
- af = AF_LINK;
- else
- af = m->m_pkthdr.csum_data;
- m->m_flags &= ~(M_BCAST|M_MCAST);
- M_SETFIB(m, sc->gif_fibnum);
- BPF_MTAP2(ifp, &af, sizeof(af), m);
- if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
- if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len);
- /* inner AF-specific encapsulation */
- ecn = 0;
- switch (af) {
- #ifdef INET
- case AF_INET:
- proto = IPPROTO_IPV4;
- if (m->m_len < sizeof(struct ip))
- m = m_pullup(m, sizeof(struct ip));
- if (m == NULL) {
- error = ENOBUFS;
- goto err;
- }
- ip = mtod(m, struct ip *);
- ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
- ECN_NOCARE, &ecn, &ip->ip_tos);
- break;
- #endif
- #ifdef INET6
- case AF_INET6:
- proto = IPPROTO_IPV6;
- if (m->m_len < sizeof(struct ip6_hdr))
- m = m_pullup(m, sizeof(struct ip6_hdr));
- if (m == NULL) {
- error = ENOBUFS;
- goto err;
- }
- t = 0;
- ip6 = mtod(m, struct ip6_hdr *);
- ip6_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
- ECN_NOCARE, &t, &ip6->ip6_flow);
- ecn = (ntohl(t) >> 20) & 0xff;
- break;
- #endif
- case AF_LINK:
- proto = IPPROTO_ETHERIP;
- M_PREPEND(m, sizeof(struct etherip_header), M_NOWAIT);
- if (m == NULL) {
- error = ENOBUFS;
- goto err;
- }
- eth = mtod(m, struct etherip_header *);
- eth->eip_resvh = 0;
- eth->eip_ver = ETHERIP_VERSION;
- eth->eip_resvl = 0;
- break;
- default:
- error = EAFNOSUPPORT;
- m_freem(m);
- goto err;
- }
- /* XXX should we check if our outer source is legal? */
- /* dispatch to output logic based on outer AF */
- switch (sc->gif_family) {
- #ifdef INET
- case AF_INET:
- error = in_gif_output(ifp, m, proto, ecn);
- break;
- #endif
- #ifdef INET6
- case AF_INET6:
- error = in6_gif_output(ifp, m, proto, ecn);
- break;
- #endif
- default:
- m_freem(m);
- }
- err:
- if (error)
- if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
- return (error);
- }
- static void
- gif_qflush(struct ifnet *ifp __unused)
- {
- }
- int
- gif_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
- struct route *ro)
- {
- uint32_t af;
- KASSERT(ifp->if_bridge == NULL,
- ("%s: unexpectedly called with bridge attached", __func__));
- /* BPF writes need to be handled specially. */
- if (dst->sa_family == AF_UNSPEC || dst->sa_family == pseudo_AF_HDRCMPLT)
- memcpy(&af, dst->sa_data, sizeof(af));
- else
- af = RO_GET_FAMILY(ro, dst);
- /*
- * Now save the af in the inbound pkt csum data, this is a cheat since
- * we are using the inbound csum_data field to carry the af over to
- * the gif_transmit() routine, avoiding using yet another mtag.
- */
- m->m_pkthdr.csum_data = af;
- return (ifp->if_transmit(ifp, m));
- }
- void
- gif_input(struct mbuf *m, struct ifnet *ifp, int proto, uint8_t ecn)
- {
- struct etherip_header *eip;
- #ifdef INET
- struct ip *ip;
- #endif
- #ifdef INET6
- struct ip6_hdr *ip6;
- uint32_t t;
- #endif
- struct ether_header *eh;
- struct ifnet *oldifp;
- int isr, n, af;
- NET_EPOCH_ASSERT();
- if (ifp == NULL) {
- /* just in case */
- m_freem(m);
- return;
- }
- m->m_pkthdr.rcvif = ifp;
- m_clrprotoflags(m);
- switch (proto) {
- #ifdef INET
- case IPPROTO_IPV4:
- af = AF_INET;
- if (m->m_len < sizeof(struct ip))
- m = m_pullup(m, sizeof(struct ip));
- if (m == NULL)
- goto drop;
- ip = mtod(m, struct ip *);
- if (ip_ecn_egress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
- ECN_NOCARE, &ecn, &ip->ip_tos) == 0) {
- m_freem(m);
- goto drop;
- }
- break;
- #endif
- #ifdef INET6
- case IPPROTO_IPV6:
- af = AF_INET6;
- if (m->m_len < sizeof(struct ip6_hdr))
- m = m_pullup(m, sizeof(struct ip6_hdr));
- if (m == NULL)
- goto drop;
- t = htonl((uint32_t)ecn << 20);
- ip6 = mtod(m, struct ip6_hdr *);
- if (ip6_ecn_egress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
- ECN_NOCARE, &t, &ip6->ip6_flow) == 0) {
- m_freem(m);
- goto drop;
- }
- break;
- #endif
- case IPPROTO_ETHERIP:
- af = AF_LINK;
- break;
- default:
- m_freem(m);
- goto drop;
- }
- #ifdef MAC
- mac_ifnet_create_mbuf(ifp, m);
- #endif
- if (bpf_peers_present(ifp->if_bpf)) {
- uint32_t af1 = af;
- bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m);
- }
- if ((ifp->if_flags & IFF_MONITOR) != 0) {
- if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
- if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
- m_freem(m);
- return;
- }
- if (ng_gif_input_p != NULL) {
- (*ng_gif_input_p)(ifp, &m, af);
- if (m == NULL)
- goto drop;
- }
- /*
- * Put the packet to the network layer input queue according to the
- * specified address family.
- * Note: older versions of gif_input directly called network layer
- * input functions, e.g. ip6_input, here. We changed the policy to
- * prevent too many recursive calls of such input functions, which
- * might cause kernel panic. But the change may introduce another
- * problem; if the input queue is full, packets are discarded.
- * The kernel stack overflow really happened, and we believed
- * queue-full rarely occurs, so we changed the policy.
- */
- switch (af) {
- #ifdef INET
- case AF_INET:
- isr = NETISR_IP;
- break;
- #endif
- #ifdef INET6
- case AF_INET6:
- isr = NETISR_IPV6;
- break;
- #endif
- case AF_LINK:
- n = sizeof(struct etherip_header) +
- sizeof(struct ether_header);
- if (n > m->m_len)
- m = m_pullup(m, n);
- if (m == NULL)
- goto drop;
- eip = mtod(m, struct etherip_header *);
- if (eip->eip_ver != ETHERIP_VERSION) {
- /* discard unknown versions */
- m_freem(m);
- goto drop;
- }
- m_adj_decap(m, sizeof(struct etherip_header));
- m->m_flags &= ~(M_BCAST|M_MCAST);
- m->m_pkthdr.rcvif = ifp;
- if (ifp->if_bridge) {
- oldifp = ifp;
- eh = mtod(m, struct ether_header *);
- if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
- if (ETHER_IS_BROADCAST(eh->ether_dhost))
- m->m_flags |= M_BCAST;
- else
- m->m_flags |= M_MCAST;
- if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
- }
- BRIDGE_INPUT(ifp, m);
- if (m != NULL && ifp != oldifp) {
- /*
- * The bridge gave us back itself or one of the
- * members for which the frame is addressed.
- */
- ether_demux(ifp, m);
- return;
- }
- }
- if (m != NULL)
- m_freem(m);
- return;
- default:
- if (ng_gif_input_orphan_p != NULL)
- (*ng_gif_input_orphan_p)(ifp, m, af);
- else
- m_freem(m);
- return;
- }
- if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
- if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
- M_SETFIB(m, ifp->if_fib);
- netisr_dispatch(isr, m);
- return;
- drop:
- if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
- }
- static int
- gif_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
- {
- struct ifreq *ifr = (struct ifreq*)data;
- struct gif_softc *sc;
- u_int options;
- int error;
- switch (cmd) {
- case SIOCSIFADDR:
- ifp->if_flags |= IFF_UP;
- case SIOCADDMULTI:
- case SIOCDELMULTI:
- case SIOCGIFMTU:
- case SIOCSIFFLAGS:
- return (0);
- case SIOCSIFMTU:
- if (ifr->ifr_mtu < GIF_MTU_MIN ||
- ifr->ifr_mtu > GIF_MTU_MAX)
- return (EINVAL);
- else
- ifp->if_mtu = ifr->ifr_mtu;
- return (0);
- }
- sx_xlock(&gif_ioctl_sx);
- sc = ifp->if_softc;
- if (sc == NULL) {
- error = ENXIO;
- goto bad;
- }
- error = 0;
- switch (cmd) {
- case SIOCDIFPHYADDR:
- if (sc->gif_family == 0)
- break;
- gif_delete_tunnel(sc);
- break;
- #ifdef INET
- case SIOCSIFPHYADDR:
- case SIOCGIFPSRCADDR:
- case SIOCGIFPDSTADDR:
- error = in_gif_ioctl(sc, cmd, data);
- break;
- #endif
- #ifdef INET6
- case SIOCSIFPHYADDR_IN6:
- case SIOCGIFPSRCADDR_IN6:
- case SIOCGIFPDSTADDR_IN6:
- error = in6_gif_ioctl(sc, cmd, data);
- break;
- #endif
- case SIOCGTUNFIB:
- ifr->ifr_fib = sc->gif_fibnum;
- break;
- case SIOCSTUNFIB:
- if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0)
- break;
- if (ifr->ifr_fib >= rt_numfibs)
- error = EINVAL;
- else
- sc->gif_fibnum = ifr->ifr_fib;
- break;
- case GIFGOPTS:
- options = sc->gif_options;
- error = copyout(&options, ifr_data_get_ptr(ifr),
- sizeof(options));
- break;
- case GIFSOPTS:
- if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0)
- break;
- error = copyin(ifr_data_get_ptr(ifr), &options,
- sizeof(options));
- if (error)
- break;
- if (options & ~GIF_OPTMASK) {
- error = EINVAL;
- break;
- }
- if (sc->gif_options != options) {
- switch (sc->gif_family) {
- #ifdef INET
- case AF_INET:
- error = in_gif_setopts(sc, options);
- break;
- #endif
- #ifdef INET6
- case AF_INET6:
- error = in6_gif_setopts(sc, options);
- break;
- #endif
- default:
- /* No need to invoke AF-handler */
- sc->gif_options = options;
- }
- }
- break;
- default:
- error = EINVAL;
- break;
- }
- if (error == 0 && sc->gif_family != 0) {
- if (
- #ifdef INET
- cmd == SIOCSIFPHYADDR ||
- #endif
- #ifdef INET6
- cmd == SIOCSIFPHYADDR_IN6 ||
- #endif
- 0) {
- if_link_state_change(ifp, LINK_STATE_UP);
- }
- }
- bad:
- sx_xunlock(&gif_ioctl_sx);
- return (error);
- }
- static void
- gif_delete_tunnel(struct gif_softc *sc)
- {
- sx_assert(&gif_ioctl_sx, SA_XLOCKED);
- if (sc->gif_family != 0) {
- CK_LIST_REMOVE(sc, srchash);
- CK_LIST_REMOVE(sc, chain);
- /* Wait until it become safe to free gif_hdr */
- GIF_WAIT();
- free(sc->gif_hdr, M_GIF);
- }
- sc->gif_family = 0;
- GIF2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
- if_link_state_change(GIF2IFP(sc), LINK_STATE_DOWN);
- }
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