From bceabc95c1c85d793200446fa85f1ddc6313ea29 Mon Sep 17 00:00:00 2001 From: Sebastian Huber Date: Wed, 9 Oct 2013 22:42:09 +0200 Subject: Move files to match FreeBSD layout --- freebsd/sys/netinet6/in6_gif.c | 466 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 466 insertions(+) create mode 100644 freebsd/sys/netinet6/in6_gif.c (limited to 'freebsd/sys/netinet6/in6_gif.c') diff --git a/freebsd/sys/netinet6/in6_gif.c b/freebsd/sys/netinet6/in6_gif.c new file mode 100644 index 00000000..482181db --- /dev/null +++ b/freebsd/sys/netinet6/in6_gif.c @@ -0,0 +1,466 @@ +#include + +/*- + * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. + * 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: in6_gif.c,v 1.49 2001/05/14 14:02:17 itojun Exp $ + */ + +#include +__FBSDID("$FreeBSD$"); + +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include +#include +#ifdef INET +#include +#endif +#include +#ifdef INET6 +#include +#include +#include +#include +#endif +#include +#include +#ifdef INET6 +#include +#endif + +#include + +VNET_DEFINE(int, ip6_gif_hlim) = GIF_HLIM; +#define V_ip6_gif_hlim VNET(ip6_gif_hlim) + +SYSCTL_DECL(_net_inet6_ip6); +SYSCTL_VNET_INT(_net_inet6_ip6, IPV6CTL_GIF_HLIM, gifhlim, CTLFLAG_RW, + &VNET_NAME(ip6_gif_hlim), 0, ""); + +static int gif_validate6(const struct ip6_hdr *, struct gif_softc *, + struct ifnet *); + +extern struct domain inet6domain; +struct ip6protosw in6_gif_protosw = { + .pr_type = SOCK_RAW, + .pr_domain = &inet6domain, + .pr_protocol = 0, /* IPPROTO_IPV[46] */ + .pr_flags = PR_ATOMIC|PR_ADDR, + .pr_input = in6_gif_input, + .pr_output = rip6_output, + .pr_ctloutput = rip6_ctloutput, + .pr_usrreqs = &rip6_usrreqs +}; + +int +in6_gif_output(struct ifnet *ifp, + int family, /* family of the packet to be encapsulate */ + struct mbuf *m) +{ + struct gif_softc *sc = ifp->if_softc; + struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst; + struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc; + struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst; + struct ip6_hdr *ip6; + struct etherip_header eiphdr; + int error, len, proto; + u_int8_t itos, otos; + + GIF_LOCK_ASSERT(sc); + + if (sin6_src == NULL || sin6_dst == NULL || + sin6_src->sin6_family != AF_INET6 || + sin6_dst->sin6_family != AF_INET6) { + m_freem(m); + return EAFNOSUPPORT; + } + + switch (family) { +#ifdef INET + case AF_INET: + { + struct ip *ip; + + proto = IPPROTO_IPV4; + if (m->m_len < sizeof(*ip)) { + m = m_pullup(m, sizeof(*ip)); + if (!m) + return ENOBUFS; + } + ip = mtod(m, struct ip *); + itos = ip->ip_tos; + break; + } +#endif +#ifdef INET6 + case AF_INET6: + { + struct ip6_hdr *ip6; + proto = IPPROTO_IPV6; + if (m->m_len < sizeof(*ip6)) { + m = m_pullup(m, sizeof(*ip6)); + if (!m) + return ENOBUFS; + } + ip6 = mtod(m, struct ip6_hdr *); + itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; + break; + } +#endif + case AF_LINK: + proto = IPPROTO_ETHERIP; + + /* + * GIF_SEND_REVETHIP (disabled by default) intentionally + * sends an EtherIP packet with revered version field in + * the header. This is a knob for backward compatibility + * with FreeBSD 7.2R or prior. + */ + if ((sc->gif_options & GIF_SEND_REVETHIP)) { + eiphdr.eip_ver = 0; + eiphdr.eip_resvl = ETHERIP_VERSION; + eiphdr.eip_resvh = 0; + } else { + eiphdr.eip_ver = ETHERIP_VERSION; + eiphdr.eip_resvl = 0; + eiphdr.eip_resvh = 0; + } + /* prepend Ethernet-in-IP header */ + M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT); + if (m && m->m_len < sizeof(struct etherip_header)) + m = m_pullup(m, sizeof(struct etherip_header)); + if (m == NULL) + return ENOBUFS; + bcopy(&eiphdr, mtod(m, struct etherip_header *), + sizeof(struct etherip_header)); + break; + + default: +#ifdef DEBUG + printf("in6_gif_output: warning: unknown family %d passed\n", + family); +#endif + m_freem(m); + return EAFNOSUPPORT; + } + + /* prepend new IP header */ + len = sizeof(struct ip6_hdr); +#ifndef __NO_STRICT_ALIGNMENT + if (family == AF_LINK) + len += ETHERIP_ALIGN; +#endif + M_PREPEND(m, len, M_DONTWAIT); + if (m != NULL && m->m_len < len) + m = m_pullup(m, len); + if (m == NULL) { + printf("ENOBUFS in in6_gif_output %d\n", __LINE__); + return ENOBUFS; + } +#ifndef __NO_STRICT_ALIGNMENT + if (family == AF_LINK) { + len = mtod(m, vm_offset_t) & 3; + KASSERT(len == 0 || len == ETHERIP_ALIGN, + ("in6_gif_output: unexpected misalignment")); + m->m_data += len; + m->m_len -= ETHERIP_ALIGN; + } +#endif + + ip6 = mtod(m, struct ip6_hdr *); + ip6->ip6_flow = 0; + ip6->ip6_vfc &= ~IPV6_VERSION_MASK; + ip6->ip6_vfc |= IPV6_VERSION; + ip6->ip6_plen = htons((u_short)m->m_pkthdr.len); + ip6->ip6_nxt = proto; + ip6->ip6_hlim = V_ip6_gif_hlim; + ip6->ip6_src = sin6_src->sin6_addr; + /* bidirectional configured tunnel mode */ + if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr)) + ip6->ip6_dst = sin6_dst->sin6_addr; + else { + m_freem(m); + return ENETUNREACH; + } + ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE, + &otos, &itos); + ip6->ip6_flow &= ~htonl(0xff << 20); + ip6->ip6_flow |= htonl((u_int32_t)otos << 20); + + if (dst->sin6_family != sin6_dst->sin6_family || + !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) { + /* cache route doesn't match */ + bzero(dst, sizeof(*dst)); + dst->sin6_family = sin6_dst->sin6_family; + dst->sin6_len = sizeof(struct sockaddr_in6); + dst->sin6_addr = sin6_dst->sin6_addr; + if (sc->gif_ro6.ro_rt) { + RTFREE(sc->gif_ro6.ro_rt); + sc->gif_ro6.ro_rt = NULL; + } +#if 0 + GIF2IFP(sc)->if_mtu = GIF_MTU; +#endif + } + + if (sc->gif_ro6.ro_rt == NULL) { + rtalloc((struct route *)&sc->gif_ro6); + if (sc->gif_ro6.ro_rt == NULL) { + m_freem(m); + return ENETUNREACH; + } + + /* if it constitutes infinite encapsulation, punt. */ + if (sc->gif_ro.ro_rt->rt_ifp == ifp) { + m_freem(m); + return ENETUNREACH; /*XXX*/ + } +#if 0 + ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu + - sizeof(struct ip6_hdr); +#endif + } + +#ifdef IPV6_MINMTU + /* + * force fragmentation to minimum MTU, to avoid path MTU discovery. + * it is too painful to ask for resend of inner packet, to achieve + * path MTU discovery for encapsulated packets. + */ + error = ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL); +#else + error = ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL); +#endif + + if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) && + sc->gif_ro6.ro_rt != NULL) { + RTFREE(sc->gif_ro6.ro_rt); + sc->gif_ro6.ro_rt = NULL; + } + + return (error); +} + +int +in6_gif_input(struct mbuf **mp, int *offp, int proto) +{ + struct mbuf *m = *mp; + struct ifnet *gifp = NULL; + struct gif_softc *sc; + struct ip6_hdr *ip6; + int af = 0; + u_int32_t otos; + + ip6 = mtod(m, struct ip6_hdr *); + + sc = (struct gif_softc *)encap_getarg(m); + if (sc == NULL) { + m_freem(m); + V_ip6stat.ip6s_nogif++; + return IPPROTO_DONE; + } + + gifp = GIF2IFP(sc); + if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) { + m_freem(m); + V_ip6stat.ip6s_nogif++; + return IPPROTO_DONE; + } + + otos = ip6->ip6_flow; + m_adj(m, *offp); + + switch (proto) { +#ifdef INET + case IPPROTO_IPV4: + { + struct ip *ip; + u_int8_t otos8; + af = AF_INET; + otos8 = (ntohl(otos) >> 20) & 0xff; + if (m->m_len < sizeof(*ip)) { + m = m_pullup(m, sizeof(*ip)); + if (!m) + return IPPROTO_DONE; + } + ip = mtod(m, struct ip *); + if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ? + ECN_ALLOWED : ECN_NOCARE, + &otos8, &ip->ip_tos) == 0) { + m_freem(m); + return IPPROTO_DONE; + } + break; + } +#endif /* INET */ +#ifdef INET6 + case IPPROTO_IPV6: + { + struct ip6_hdr *ip6; + af = AF_INET6; + if (m->m_len < sizeof(*ip6)) { + m = m_pullup(m, sizeof(*ip6)); + if (!m) + return IPPROTO_DONE; + } + ip6 = mtod(m, struct ip6_hdr *); + if (ip6_ecn_egress((gifp->if_flags & IFF_LINK1) ? + ECN_ALLOWED : ECN_NOCARE, + &otos, &ip6->ip6_flow) == 0) { + m_freem(m); + return IPPROTO_DONE; + } + break; + } +#endif + case IPPROTO_ETHERIP: + af = AF_LINK; + break; + + default: + V_ip6stat.ip6s_nogif++; + m_freem(m); + return IPPROTO_DONE; + } + + gif_input(m, af, gifp); + return IPPROTO_DONE; +} + +/* + * validate outer address. + */ +static int +gif_validate6(const struct ip6_hdr *ip6, struct gif_softc *sc, + struct ifnet *ifp) +{ + struct sockaddr_in6 *src, *dst; + + src = (struct sockaddr_in6 *)sc->gif_psrc; + dst = (struct sockaddr_in6 *)sc->gif_pdst; + + /* + * Check for address match. Note that the check is for an incoming + * packet. We should compare the *source* address in our configuration + * and the *destination* address of the packet, and vice versa. + */ + if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) || + !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src)) + return 0; + + /* martian filters on outer source - done in ip6_input */ + + /* ingress filters on outer source */ + if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) { + struct sockaddr_in6 sin6; + struct rtentry *rt; + + bzero(&sin6, sizeof(sin6)); + sin6.sin6_family = AF_INET6; + sin6.sin6_len = sizeof(struct sockaddr_in6); + sin6.sin6_addr = ip6->ip6_src; + sin6.sin6_scope_id = 0; /* XXX */ + + rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); + if (!rt || rt->rt_ifp != ifp) { +#if 0 + char ip6buf[INET6_ADDRSTRLEN]; + log(LOG_WARNING, "%s: packet from %s dropped " + "due to ingress filter\n", if_name(GIF2IFP(sc)), + ip6_sprintf(ip6buf, &sin6.sin6_addr)); +#endif + if (rt) + RTFREE_LOCKED(rt); + return 0; + } + RTFREE_LOCKED(rt); + } + + return 128 * 2; +} + +/* + * we know that we are in IFF_UP, outer address available, and outer family + * matched the physical addr family. see gif_encapcheck(). + * sanity check for arg should have been done in the caller. + */ +int +gif_encapcheck6(const struct mbuf *m, int off, int proto, void *arg) +{ + struct ip6_hdr ip6; + struct gif_softc *sc; + struct ifnet *ifp; + + /* sanity check done in caller */ + sc = (struct gif_softc *)arg; + + /* LINTED const cast */ + m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6); + ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL; + + return gif_validate6(&ip6, sc, ifp); +} + +int +in6_gif_attach(struct gif_softc *sc) +{ + sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck, + (void *)&in6_gif_protosw, sc); + if (sc->encap_cookie6 == NULL) + return EEXIST; + return 0; +} + +int +in6_gif_detach(struct gif_softc *sc) +{ + int error; + + error = encap_detach(sc->encap_cookie6); + if (error == 0) + sc->encap_cookie6 = NULL; + return error; +} -- cgit v1.2.3