xnu-3789.70.16.tar.gz

[apple/xnu.git] / bsd / netinet6 / in6_gif.c

diff --git a/bsd/netinet6/in6_gif.c b/bsd/netinet6/in6_gif.c
index 8d963768c3c94e548b18357b0cd3dae4a94c9a65..89037d5b1e5df832af9bd99d724c739b0c57836f 100644 (file)
--- a/bsd/netinet6/in6_gif.c
+++ b/bsd/netinet6/in6_gif.c
@@ -1,5 +1,33 @@
-/*     $FreeBSD: src/sys/netinet6/in6_gif.c,v 1.2.2.3 2001/07/03 11:01:52 ume Exp $    */
-/*     $KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 itojun Exp $        */
+/*
+ * Copyright (c) 2009-2016 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */
+
+/* $FreeBSD: src/sys/netinet6/in6_gif.c,v 1.2.2.3 2001/07/03 11:01:52 ume Exp $ */
+/* $KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 itojun Exp $ */

 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.


@@ -68,25 +96,29 @@
 #include <net/net_osdep.h>
 
 int
 #include <net/net_osdep.h>
 
 int

-in6_gif_output(ifp, family, m, rt)
-       struct ifnet *ifp;
-       int family; /* family of the packet to be encapsulate. */
-       struct mbuf *m;
-       struct rtentry *rt;
+in6_gif_output(
+       struct ifnet *ifp,
+       int family, /* family of the packet to be encapsulate. */
+       struct mbuf *m,
+       __unused struct rtentry *rt)

 {
 {

-       struct gif_softc *sc = (struct gif_softc*)ifp;
+       struct gif_softc *sc = ifnet_softc(ifp);

        struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst;
        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 sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)
+           (void *)sc->gif_psrc;
+       struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)
+           (void *)sc->gif_pdst;

        struct ip6_hdr *ip6;
        int proto;
        u_int8_t itos, otos;
 
        struct ip6_hdr *ip6;
        int 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);
        if (sin6_src == NULL || sin6_dst == NULL ||
            sin6_src->sin6_family != AF_INET6 ||
            sin6_dst->sin6_family != AF_INET6) {
                m_freem(m);

-               return EAFNOSUPPORT;
+               return (EAFNOSUPPORT);

        }
 
        switch (family) {
        }
 
        switch (family) {


@@ -96,10 +128,10 @@ in6_gif_output(ifp, family, m, rt)
                struct ip *ip;
 
                proto = IPPROTO_IPV4;
                struct ip *ip;
 
                proto = IPPROTO_IPV4;

-               if (m->m_len < sizeof(*ip)) {
-                       m = m_pullup(m, sizeof(*ip));
+               if (mbuf_len(m) < sizeof (*ip)) {
+                       m = m_pullup(m, sizeof (*ip));

                        if (!m)
                        if (!m)

-                               return ENOBUFS;
+                               return (ENOBUFS);

                }
                ip = mtod(m, struct ip *);
                itos = ip->ip_tos;
                }
                ip = mtod(m, struct ip *);
                itos = ip->ip_tos;


@@ -109,12 +141,11 @@ in6_gif_output(ifp, family, m, rt)
 #if INET6
        case AF_INET6:
            {
 #if INET6
        case AF_INET6:
            {

-               struct ip6_hdr *ip6;

                proto = IPPROTO_IPV6;
                proto = IPPROTO_IPV6;

-               if (m->m_len < sizeof(*ip6)) {
-                       m = m_pullup(m, sizeof(*ip6));
+               if (mbuf_len(m) < sizeof (*ip6)) {
+                       m = m_pullup(m, sizeof (*ip6));

                        if (!m)
                        if (!m)

-                               return ENOBUFS;
+                               return (ENOBUFS);

                }
                ip6 = mtod(m, struct ip6_hdr *);
                itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
                }
                ip6 = mtod(m, struct ip6_hdr *);
                itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;


@@ -127,16 +158,16 @@ in6_gif_output(ifp, family, m, rt)
                        family);
 #endif
                m_freem(m);
                        family);
 #endif
                m_freem(m);

-               return EAFNOSUPPORT;
+               return (EAFNOSUPPORT);

        }
        }

-       
+

        /* prepend new IP header */
        /* prepend new IP header */

-       M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
-       if (m && m->m_len < sizeof(struct ip6_hdr))
-               m = m_pullup(m, sizeof(struct ip6_hdr));
+       M_PREPEND(m, sizeof (struct ip6_hdr), M_DONTWAIT, 1);
+       if (m && mbuf_len(m) < sizeof (struct ip6_hdr))
+               m = m_pullup(m, sizeof (struct ip6_hdr));

        if (m == NULL) {
                printf("ENOBUFS in in6_gif_output %d\n", __LINE__);
        if (m == NULL) {
                printf("ENOBUFS in in6_gif_output %d\n", __LINE__);

-               return ENOBUFS;
+               return (ENOBUFS);

        }
 
        ip6 = mtod(m, struct ip6_hdr *);
        }
 
        ip6 = mtod(m, struct ip6_hdr *);


@@ -152,26 +183,23 @@ in6_gif_output(ifp, family, m, rt)
                ip6->ip6_dst = sin6_dst->sin6_addr;
        else  {
                m_freem(m);
                ip6->ip6_dst = sin6_dst->sin6_addr;
        else  {
                m_freem(m);

-               return ENETUNREACH;
+               return (ENETUNREACH);

        }
        }

-       if (ifp->if_flags & IFF_LINK1)
-               ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
-       else
-               ip_ecn_ingress(ECN_NOCARE, &otos, &itos);
-       ip6->ip6_flow &= ~ntohl(0xff00000);
+       ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_NORMAL : ECN_NOCARE,
+           &otos, &itos);
+       ip6->ip6_flow &= ~htonl(0xff << 20);

        ip6->ip6_flow |= htonl((u_int32_t)otos << 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));
+       if (ROUTE_UNUSABLE(&sc->gif_ro6) ||
+           dst->sin6_family != sin6_dst->sin6_family ||
+           !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr) ||
+           (sc->gif_ro6.ro_rt != NULL && sc->gif_ro6.ro_rt->rt_ifp == ifp)) {
+               /* cache route doesn't match or recursive route */
+               bzero(dst, sizeof (*dst));

                dst->sin6_family = sin6_dst->sin6_family;
                dst->sin6_family = sin6_dst->sin6_family;

-               dst->sin6_len = sizeof(struct sockaddr_in6);
+               dst->sin6_len = sizeof (struct sockaddr_in6);

                dst->sin6_addr = sin6_dst->sin6_addr;
                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;
-               }
+               ROUTE_RELEASE(&sc->gif_ro6);

 #if 0
                sc->gif_if.if_mtu = GIF_MTU;
 #endif
 #if 0
                sc->gif_if.if_mtu = GIF_MTU;
 #endif


@@ -181,54 +209,54 @@ in6_gif_output(ifp, family, m, rt)
                rtalloc((struct route *)&sc->gif_ro6);
                if (sc->gif_ro6.ro_rt == NULL) {
                        m_freem(m);
                rtalloc((struct route *)&sc->gif_ro6);
                if (sc->gif_ro6.ro_rt == NULL) {
                        m_freem(m);

-                       return ENETUNREACH;
+                       return (ENETUNREACH);

                }
                }

-
+               RT_LOCK(sc->gif_ro6.ro_rt);

                /* if it constitutes infinite encapsulation, punt. */
                /* if it constitutes infinite encapsulation, punt. */

-               if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
+               if (sc->gif_ro6.ro_rt->rt_ifp == ifp) {
+                       RT_UNLOCK(sc->gif_ro6.ro_rt);

                        m_freem(m);
                        m_freem(m);

-                       return ENETUNREACH;     /*XXX*/
+                       return (ENETUNREACH); /* XXX */

                }
 #if 0
                ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu
                }
 #if 0
                ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu

-                       - sizeof(struct ip6_hdr);
+                       - sizeof (struct ip6_hdr);

 #endif
 #endif

+               RT_UNLOCK(sc->gif_ro6.ro_rt);

        }
        }

-       
+

 #if 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.
         */
 #if 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.
         */

-       return(ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL));
+       return (ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL));

 #else
 #else

-       return(ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL));
+       return (ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL));

 #endif
 }
 
 #endif
 }
 

-int in6_gif_input(mp, offp)
-       struct mbuf **mp;
-       int *offp;
+int
+in6_gif_input(struct mbuf **mp, int *offp, int proto)

 {
        struct mbuf *m = *mp;
        struct ifnet *gifp = NULL;
        struct ip6_hdr *ip6;
        int af = 0;
        u_int32_t otos;
 {
        struct mbuf *m = *mp;
        struct ifnet *gifp = NULL;
        struct ip6_hdr *ip6;
        int af = 0;
        u_int32_t otos;

-       u_int8_t proto;
+       int egress_success = 0;

 
        ip6 = mtod(m, struct ip6_hdr *);
 
 
        ip6 = mtod(m, struct ip6_hdr *);
 

-       gifp = (struct ifnet *)encap_getarg(m);
+       gifp = ((struct gif_softc *)encap_getarg(m))->gif_if;

 
        if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
                m_freem(m);
                ip6stat.ip6s_nogif++;
 
        if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
                m_freem(m);
                ip6stat.ip6s_nogif++;

-               return IPPROTO_DONE;
+               return (IPPROTO_DONE);

        }
 
        }
 

-       proto = ip6->ip6_nxt;

        otos = ip6->ip6_flow;
        m_adj(m, *offp);
 
        otos = ip6->ip6_flow;
        m_adj(m, *offp);
 


@@ -237,109 +265,149 @@ int in6_gif_input(mp, offp)
        case IPPROTO_IPV4:
            {
                struct ip *ip;
        case IPPROTO_IPV4:
            {
                struct ip *ip;

-               u_int8_t otos8;
+               u_int8_t otos8, old_tos;
+               int sum;
+

                af = AF_INET;
                otos8 = (ntohl(otos) >> 20) & 0xff;
                af = AF_INET;
                otos8 = (ntohl(otos) >> 20) & 0xff;

-               if (m->m_len < sizeof(*ip)) {
-                       m = m_pullup(m, sizeof(*ip));
+               if (mbuf_len(m) < sizeof (*ip)) {
+                       m = m_pullup(m, sizeof (*ip));

                        if (!m)
                        if (!m)

-                               return IPPROTO_DONE;
+                               return (IPPROTO_DONE);

                }
                ip = mtod(m, struct ip *);
                }
                ip = mtod(m, struct ip *);

-               if (gifp->if_flags & IFF_LINK1)
-                       ip_ecn_egress(ECN_ALLOWED, &otos8, &ip->ip_tos);
-               else
-                       ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos);
+               if (gifp->if_flags & IFF_LINK1) {
+                       old_tos = ip->ip_tos;
+                       egress_success = ip_ecn_egress(ECN_NORMAL, &otos8, &ip->ip_tos);
+                       if (old_tos != ip->ip_tos) {
+                           sum = ~ntohs(ip->ip_sum) & 0xffff;
+                           sum += (~old_tos & 0xffff) + ip->ip_tos;
+                           sum = (sum >> 16) + (sum & 0xffff);
+                           sum += (sum >> 16);  /* add carry */
+                           ip->ip_sum = htons(~sum & 0xffff);
+                       }
+               } else
+                       egress_success = ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos);

                break;
            }
 #endif /* INET */
 #if INET6
        case IPPROTO_IPV6:
            {
                break;
            }
 #endif /* INET */
 #if INET6
        case IPPROTO_IPV6:
            {

-               struct ip6_hdr *ip6;

                af = AF_INET6;
                af = AF_INET6;

-               if (m->m_len < sizeof(*ip6)) {
-                       m = m_pullup(m, sizeof(*ip6));
+               if (mbuf_len(m) < sizeof (*ip6)) {
+                       m = m_pullup(m, sizeof (*ip6));

                        if (!m)
                        if (!m)

-                               return IPPROTO_DONE;
+                               return (IPPROTO_DONE);

                }
                ip6 = mtod(m, struct ip6_hdr *);
                if (gifp->if_flags & IFF_LINK1)
                }
                ip6 = mtod(m, struct ip6_hdr *);
                if (gifp->if_flags & IFF_LINK1)

-                       ip6_ecn_egress(ECN_ALLOWED, &otos, &ip6->ip6_flow);
+                       egress_success = ip6_ecn_egress(ECN_NORMAL, &otos, &ip6->ip6_flow);

                else
                else

-                       ip6_ecn_egress(ECN_NOCARE, &otos, &ip6->ip6_flow);
+                       egress_success = ip6_ecn_egress(ECN_NOCARE, &otos, &ip6->ip6_flow);

                break;
            }
 #endif
        default:
                ip6stat.ip6s_nogif++;
                m_freem(m);
                break;
            }
 #endif
        default:
                ip6stat.ip6s_nogif++;
                m_freem(m);

-               return IPPROTO_DONE;
+               return (IPPROTO_DONE);

        }
        }

-               
-       dlil_input(gifp, m, m);
-       return IPPROTO_DONE;
+
+       if (egress_success == 0) {
+               ip6stat.ip6s_nogif++;
+               m_freem(m);
+               return (IPPROTO_DONE);
+       }
+
+       /* Replace the rcvif by gifp for ifnet_input to route it correctly */
+       if (m->m_pkthdr.rcvif)
+               m->m_pkthdr.rcvif = gifp;
+
+       ifnet_input(gifp, m, NULL);
+       return (IPPROTO_DONE);

 }
 
 /*
 }
 
 /*

- * we know that we are in IFF_UP, outer address available, and outer family
- * matched the physical addr family.  see gif_encapcheck().
+ * validate outer address.

  */
  */

-int
-gif_encapcheck6(m, off, proto, arg)
-       const struct mbuf *m;
-       int off;
-       int proto;
-       void *arg;
+static int
+gif_validate6(
+       const struct ip6_hdr *ip6,
+       struct gif_softc *sc,
+       struct ifnet *ifp)

 {
 {

-       struct ip6_hdr ip6;
-       struct gif_softc *sc;

        struct sockaddr_in6 *src, *dst;
        struct sockaddr_in6 *src, *dst;

-       int addrmatch;

 
 

-       /* sanity check done in caller */
-       sc = (struct gif_softc *)arg;
-       src = (struct sockaddr_in6 *)sc->gif_psrc;
-       dst = (struct sockaddr_in6 *)sc->gif_pdst;
-
-       /* LINTED const cast */
-       m_copydata((struct mbuf *)m, 0, sizeof(ip6), (caddr_t)&ip6);
+       src = (struct sockaddr_in6 *)(void *)sc->gif_psrc;
+       dst = (struct sockaddr_in6 *)(void *)sc->gif_pdst;

 
 

-       /* check for address match */
-       addrmatch = 0;
-       if (IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6.ip6_dst))
-               addrmatch |= 1;
-       if (IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6.ip6_src))
-               addrmatch |= 2;
-       if (addrmatch != 3)
-               return 0;
+       /*
+        * 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 */
 
        /* martian filters on outer source - done in ip6_input */
 
        /* ingress filters on outer source */

-       if ((sc->gif_if.if_flags & IFF_LINK2) == 0 &&
-           (m->m_flags & M_PKTHDR) != 0 && m->m_pkthdr.rcvif) {
+       if ((ifnet_flags(sc->gif_if) & IFF_LINK2) == 0 && ifp) {

                struct sockaddr_in6 sin6;
                struct rtentry *rt;
 
                struct sockaddr_in6 sin6;
                struct rtentry *rt;
 

-               bzero(&sin6, sizeof(sin6));
+               bzero(&sin6, sizeof (sin6));

                sin6.sin6_family = AF_INET6;
                sin6.sin6_family = AF_INET6;

-               sin6.sin6_len = sizeof(struct sockaddr_in6);
-               sin6.sin6_addr = ip6.ip6_src;
-               /* XXX scopeid */
-               rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
-               if (!rt || rt->rt_ifp != m->m_pkthdr.rcvif) {
+               sin6.sin6_len = sizeof (struct sockaddr_in6);
+               sin6.sin6_addr = ip6->ip6_src;
+
+               rt = rtalloc1((struct sockaddr *)&sin6, 0, 0);
+               if (rt != NULL)
+                       RT_LOCK(rt);
+               if (!rt || rt->rt_ifp != ifp) {

 #if 0
                        log(LOG_WARNING, "%s: packet from %s dropped "
                            "due to ingress filter\n", if_name(&sc->gif_if),
                            ip6_sprintf(&sin6.sin6_addr));
 #endif
 #if 0
                        log(LOG_WARNING, "%s: packet from %s dropped "
                            "due to ingress filter\n", if_name(&sc->gif_if),
                            ip6_sprintf(&sin6.sin6_addr));
 #endif

-                       if (rt)
+                       if (rt != NULL) {
+                               RT_UNLOCK(rt);

                                rtfree(rt);
                                rtfree(rt);

-                       return 0;
+                       }
+                       return (0);

                }
                }

+               RT_UNLOCK(rt);

                rtfree(rt);
        }
 
                rtfree(rt);
        }
 

-       return 128 * 2;
+       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,
+       __unused int off,
+       __unused 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;
+
+       GIF_LOCK_ASSERT(sc);
+
+       mbuf_copydata((struct mbuf *)(size_t)m, 0, sizeof (ip6), &ip6);
+       ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
+
+       return (gif_validate6(&ip6, sc, ifp));

 }
 }