xnu-4570.51.1.tar.gz

[apple/xnu.git] / bsd / netinet / in_gif.c

diff --git a/bsd/netinet/in_gif.c b/bsd/netinet/in_gif.c
index c65eceb6818eff16ac854fd76522f79dd8b87640..86a2b9920fa0068d64c608457470aaaddce9ed6e 100644 (file)
--- a/bsd/netinet/in_gif.c
+++ b/bsd/netinet/in_gif.c
@@ -1,8 +1,8 @@
 /*
 /*

- * Copyright (c) 2000-2012 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2018 Apple Inc. All rights reserved.

  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  *
  * @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
  * 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


@@ -11,10 +11,10 @@
  * 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.
  * 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.
  * 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,
  * 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,


@@ -22,10 +22,10 @@
  * 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.
  * 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@
  */
  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */

-/*     $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $ */
+/* $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $ */

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


@@ -85,11 +85,7 @@
 #include <netinet/ip6.h>
 #endif
 
 #include <netinet/ip6.h>
 #endif
 

-#if MROUTING
-#include <netinet/ip_mroute.h>
-#endif /* MROUTING */
-
-#include <net/if_gif.h>        
+#include <net/if_gif.h>

 
 #include <net/net_osdep.h>
 
 
 #include <net/net_osdep.h>
 


@@ -105,19 +101,30 @@ in_gif_output(
        __unused struct rtentry *rt)
 {
        struct gif_softc *sc = ifnet_softc(ifp);
        __unused struct rtentry *rt)
 {
        struct gif_softc *sc = ifnet_softc(ifp);

-       struct sockaddr_in *dst = (struct sockaddr_in *)(void *)&sc->gif_ro.ro_dst;
-       struct sockaddr_in *sin_src = (struct sockaddr_in *)(void *)sc->gif_psrc;
-       struct sockaddr_in *sin_dst = (struct sockaddr_in *)(void *)sc->gif_pdst;
+       struct sockaddr_in *dst = (struct sockaddr_in *)
+           (void *)&sc->gif_ro.ro_dst;
+       struct sockaddr_in *sin_src = (struct sockaddr_in *)
+           (void *)sc->gif_psrc;
+       struct sockaddr_in *sin_dst = (struct sockaddr_in *)
+           (void *)sc->gif_pdst;

        struct ip iphdr;        /* capsule IP header, host byte ordered */
        int proto, error;
        u_int8_t tos;
        struct ip iphdr;        /* capsule IP header, host byte ordered */
        int proto, error;
        u_int8_t tos;

-       struct ip_out_args ipoa = { IFSCOPE_NONE, { 0 }, IPOAF_SELECT_SRCIF };
+       struct ip_out_args ipoa;
+
+       bzero(&ipoa, sizeof(ipoa));
+       ipoa.ipoa_boundif = IFSCOPE_NONE;
+       ipoa.ipoa_flags = IPOAF_SELECT_SRCIF;
+       ipoa.ipoa_sotc = SO_TC_UNSPEC;
+       ipoa.ipoa_netsvctype = _NET_SERVICE_TYPE_UNSPEC;
+
+       GIF_LOCK_ASSERT(sc);

 
        if (sin_src == NULL || sin_dst == NULL ||
            sin_src->sin_family != AF_INET ||
            sin_dst->sin_family != AF_INET) {
                m_freem(m);
 
        if (sin_src == NULL || sin_dst == NULL ||
            sin_src->sin_family != AF_INET ||
            sin_dst->sin_family != AF_INET) {
                m_freem(m);

-               return EAFNOSUPPORT;
+               return (EAFNOSUPPORT);

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


@@ -127,81 +134,77 @@ in_gif_output(
                struct ip *ip;
 
                proto = IPPROTO_IPV4;
                struct ip *ip;
 
                proto = IPPROTO_IPV4;

-               if (mbuf_len(m) < 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 *);
                tos = ip->ip_tos;
                break;
            }
                }
                ip = mtod(m, struct ip *);
                tos = ip->ip_tos;
                break;
            }

-#endif /*INET*/
+#endif /* INET */

 #if INET6
        case AF_INET6:
            {
                struct ip6_hdr *ip6;
                proto = IPPROTO_IPV6;
 #if INET6
        case AF_INET6:
            {
                struct ip6_hdr *ip6;
                proto = IPPROTO_IPV6;

-               if (mbuf_len(m) < 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 *);
                tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
                break;
            }
                }
                ip6 = mtod(m, struct ip6_hdr *);
                tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
                break;
            }

-#endif /*INET6*/
+#endif /* INET6 */

        default:
 #if DEBUG
                printf("in_gif_output: warning: unknown family %d passed\n",
                        family);
 #endif
                m_freem(m);
        default:
 #if DEBUG
                printf("in_gif_output: warning: unknown family %d passed\n",
                        family);
 #endif
                m_freem(m);

-               return EAFNOSUPPORT;
+               return (EAFNOSUPPORT);

        }
 
        }
 

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

        iphdr.ip_src = sin_src->sin_addr;
        /* bidirectional configured tunnel mode */
        if (sin_dst->sin_addr.s_addr != INADDR_ANY)
                iphdr.ip_dst = sin_dst->sin_addr;
        else {
                m_freem(m);
        iphdr.ip_src = sin_src->sin_addr;
        /* bidirectional configured tunnel mode */
        if (sin_dst->sin_addr.s_addr != INADDR_ANY)
                iphdr.ip_dst = sin_dst->sin_addr;
        else {
                m_freem(m);

-               return ENETUNREACH;
+               return (ENETUNREACH);

        }
        iphdr.ip_p = proto;
        /* version will be set in ip_output() */
        iphdr.ip_ttl = ip_gif_ttl;
        }
        iphdr.ip_p = proto;
        /* version will be set in ip_output() */
        iphdr.ip_ttl = ip_gif_ttl;

-       iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
+       iphdr.ip_len = m->m_pkthdr.len + sizeof (struct ip);

        if (ifp->if_flags & IFF_LINK1)
        if (ifp->if_flags & IFF_LINK1)

-               ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);
+               ip_ecn_ingress(ECN_NORMAL, &iphdr.ip_tos, &tos);

        else
                ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
 
        /* prepend new IP header */
        else
                ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
 
        /* prepend new IP header */

-       M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
-       if (m && mbuf_len(m) < sizeof(struct ip))
-               m = m_pullup(m, sizeof(struct ip));
+       M_PREPEND(m, sizeof (struct ip), M_DONTWAIT, 0);
+       if (m && mbuf_len(m) < sizeof (struct ip))
+               m = m_pullup(m, sizeof (struct ip));

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

-               return ENOBUFS;
+               return (ENOBUFS);

        }
        }

-       bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
+       bcopy(&iphdr, mtod(m, struct ip *), sizeof (struct ip));

 
 

-       if (dst->sin_family != sin_dst->sin_family ||
+       if (ROUTE_UNUSABLE(&sc->gif_ro) ||
+           dst->sin_family != sin_dst->sin_family ||

            dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr ||
            dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr ||

-           (sc->gif_ro.ro_rt != NULL &&
-           (sc->gif_ro.ro_rt->generation_id != route_generation ||
-           sc->gif_ro.ro_rt->rt_ifp == ifp))) {
+           (sc->gif_ro.ro_rt != NULL && sc->gif_ro.ro_rt->rt_ifp == ifp)) {

                /* cache route doesn't match or recursive route */
                dst->sin_family = sin_dst->sin_family;
                /* cache route doesn't match or recursive route */
                dst->sin_family = sin_dst->sin_family;

-               dst->sin_len = sizeof(struct sockaddr_in);
+               dst->sin_len = sizeof (struct sockaddr_in);

                dst->sin_addr = sin_dst->sin_addr;
                dst->sin_addr = sin_dst->sin_addr;

-               if (sc->gif_ro.ro_rt) {
-                       rtfree(sc->gif_ro.ro_rt);
-                       sc->gif_ro.ro_rt = NULL;
-               }
+               ROUTE_RELEASE(&sc->gif_ro);

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


@@ -211,7 +214,7 @@ in_gif_output(
                rtalloc(&sc->gif_ro);
                if (sc->gif_ro.ro_rt == NULL) {
                        m_freem(m);
                rtalloc(&sc->gif_ro);
                if (sc->gif_ro.ro_rt == NULL) {
                        m_freem(m);

-                       return ENETUNREACH;
+                       return (ENETUNREACH);

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


@@ -219,34 +222,35 @@ in_gif_output(
                if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
                        RT_UNLOCK(sc->gif_ro.ro_rt);
                        m_freem(m);
                if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
                        RT_UNLOCK(sc->gif_ro.ro_rt);
                        m_freem(m);

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

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

-                       - sizeof(struct ip);
+                   - sizeof (struct ip);

 #endif
                RT_UNLOCK(sc->gif_ro.ro_rt);
        }
 
        error = ip_output(m, NULL, &sc->gif_ro, IP_OUTARGS, NULL, &ipoa);
 #endif
                RT_UNLOCK(sc->gif_ro.ro_rt);
        }
 
        error = ip_output(m, NULL, &sc->gif_ro, IP_OUTARGS, NULL, &ipoa);

-       return(error);
+
+       return (error);

 }
 
 void
 }
 
 void

-in_gif_input(m, off)
-       struct mbuf *m;
-       int off;
+in_gif_input(struct mbuf *m, int off)

 {
        struct ifnet *gifp = NULL;
        struct ip *ip;
        int af, proto;
 {
        struct ifnet *gifp = NULL;
        struct ip *ip;
        int af, proto;

-       u_int8_t otos;
+       u_int8_t otos, old_tos;
+       int egress_success = 0;
+       int sum;

 
        ip = mtod(m, struct ip *);
        proto = ip->ip_p;
 
 
 
        ip = mtod(m, struct ip *);
        proto = ip->ip_p;
 
 

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

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


@@ -262,16 +266,24 @@ in_gif_input(m, off)
        case IPPROTO_IPV4:
            {
                af = AF_INET;
        case IPPROTO_IPV4:
            {
                af = AF_INET;

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

                        if (!m)
                                return;
                }
                ip = mtod(m, struct ip *);
                        if (!m)
                                return;
                }
                ip = mtod(m, struct ip *);

-               if (gifp->if_flags & IFF_LINK1)
-                       ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
-               else
-                       ip_ecn_egress(ECN_NOCARE, &otos, &ip->ip_tos);
+               if (gifp->if_flags & IFF_LINK1) {
+                       old_tos = ip->ip_tos;
+                       egress_success = ip_ecn_egress(ECN_NORMAL, &otos, &ip->ip_tos);
+                       if (old_tos != ip->ip_tos) {
+                           sum = ~ntohs(ip->ip_sum) & 0xffff;
+                           sum += (~otos & 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, &otos, &ip->ip_tos);

                break;
            }
 #endif
                break;
            }
 #endif


@@ -281,17 +293,17 @@ in_gif_input(m, off)
                struct ip6_hdr *ip6;
                u_int8_t itos;
                af = AF_INET6;
                struct ip6_hdr *ip6;
                u_int8_t itos;
                af = AF_INET6;

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

                        if (!m)
                                return;
                }
                ip6 = mtod(m, struct ip6_hdr *);
                itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
                if (gifp->if_flags & IFF_LINK1)
                        if (!m)
                                return;
                }
                ip6 = mtod(m, struct ip6_hdr *);
                itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
                if (gifp->if_flags & IFF_LINK1)

-                       ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
+                       egress_success = ip_ecn_egress(ECN_NORMAL, &otos, &itos);

                else
                else

-                       ip_ecn_egress(ECN_NOCARE, &otos, &itos);
+                       egress_success = ip_ecn_egress(ECN_NOCARE, &otos, &itos);

                ip6->ip6_flow &= ~htonl(0xff << 20);
                ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
                break;
                ip6->ip6_flow &= ~htonl(0xff << 20);
                ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
                break;


@@ -302,30 +314,25 @@ in_gif_input(m, off)
                m_freem(m);
                return;
        }
                m_freem(m);
                return;
        }

+
+       if (egress_success == 0) {
+               OSAddAtomic(1, &ipstat.ips_nogif);
+               m_freem(m);
+               return;
+       }
+

 #ifdef __APPLE__
 #ifdef __APPLE__

-       /* Should we free m if dlil_input returns an error? */
-       if (m->m_pkthdr.rcvif)  /* replace the rcvif by gifp for dlil to route it correctly */
+       /* Replace the rcvif by gifp for dlil to route it correctly */
+       if (m->m_pkthdr.rcvif)

                m->m_pkthdr.rcvif = gifp;
        ifnet_input(gifp, m, NULL);
 #else
        gif_input(m, af, gifp);
 #endif
                m->m_pkthdr.rcvif = gifp;
        ifnet_input(gifp, m, NULL);
 #else
        gif_input(m, af, gifp);
 #endif

-       return;
-}
-
-static __inline__ void*
-_cast_non_const(const void * ptr) {
-       union {
-               const void*             cval;
-               void*                   val;
-       } ret;
-       
-       ret.cval = ptr;
-       return (ret.val);

 }
 
 /*
 }
 
 /*

- * we know that we are in IFF_UP, outer address available, and outer family
+ * We know that we are in IFF_UP, outer address available, and outer family

  * matched the physical addr family.  see gif_encapcheck().
  */
 int
  * matched the physical addr family.  see gif_encapcheck().
  */
 int


@@ -346,7 +353,9 @@ gif_encapcheck4(
        src = (struct sockaddr_in *)(void *)sc->gif_psrc;
        dst = (struct sockaddr_in *)(void *)sc->gif_pdst;
 
        src = (struct sockaddr_in *)(void *)sc->gif_psrc;
        dst = (struct sockaddr_in *)(void *)sc->gif_pdst;
 

-       mbuf_copydata((struct mbuf *)(size_t)m, 0, sizeof(ip), &ip);
+       GIF_LOCK_ASSERT(sc);
+
+       mbuf_copydata((struct mbuf *)(size_t)m, 0, sizeof (ip), &ip);

 
        /* check for address match */
        addrmatch = 0;
 
        /* check for address match */
        addrmatch = 0;


@@ -355,27 +364,26 @@ gif_encapcheck4(
        if (dst->sin_addr.s_addr == ip.ip_src.s_addr)
                addrmatch |= 2;
        if (addrmatch != 3)
        if (dst->sin_addr.s_addr == ip.ip_src.s_addr)
                addrmatch |= 2;
        if (addrmatch != 3)

-               return 0;
+               return (0);

 
        /* martian filters on outer source - NOT done in ip_input! */
        if (IN_MULTICAST(ntohl(ip.ip_src.s_addr)))
 
        /* martian filters on outer source - NOT done in ip_input! */
        if (IN_MULTICAST(ntohl(ip.ip_src.s_addr)))

-               return 0;
+               return (0);

        switch ((ntohl(ip.ip_src.s_addr) & 0xff000000) >> 24) {
        case 0: case 127: case 255:
        switch ((ntohl(ip.ip_src.s_addr) & 0xff000000) >> 24) {
        case 0: case 127: case 255:

-               return 0;
+               return (0);

        }
        /* reject packets with broadcast on source */
        lck_rw_lock_shared(in_ifaddr_rwlock);
        for (ia4 = TAILQ_FIRST(&in_ifaddrhead); ia4;
        }
        /* reject packets with broadcast on source */
        lck_rw_lock_shared(in_ifaddr_rwlock);
        for (ia4 = TAILQ_FIRST(&in_ifaddrhead); ia4;

-            ia4 = TAILQ_NEXT(ia4, ia_link))
-       {
+           ia4 = TAILQ_NEXT(ia4, ia_link)) {

                if ((ifnet_flags(ia4->ia_ifa.ifa_ifp) & IFF_BROADCAST) == 0)
                        continue;
                IFA_LOCK(&ia4->ia_ifa);
                if (ip.ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr) {
                        IFA_UNLOCK(&ia4->ia_ifa);
                        lck_rw_done(in_ifaddr_rwlock);
                if ((ifnet_flags(ia4->ia_ifa.ifa_ifp) & IFF_BROADCAST) == 0)
                        continue;
                IFA_LOCK(&ia4->ia_ifa);
                if (ip.ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr) {
                        IFA_UNLOCK(&ia4->ia_ifa);
                        lck_rw_done(in_ifaddr_rwlock);

-                       return 0;
+                       return (0);

                }
                IFA_UNLOCK(&ia4->ia_ifa);
        }
                }
                IFA_UNLOCK(&ia4->ia_ifa);
        }


@@ -387,9 +395,9 @@ gif_encapcheck4(
                struct sockaddr_in sin;
                struct rtentry *rt;
 
                struct sockaddr_in sin;
                struct rtentry *rt;
 

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

                sin.sin_family = AF_INET;
                sin.sin_family = AF_INET;

-               sin.sin_len = sizeof(struct sockaddr_in);
+               sin.sin_len = sizeof (struct sockaddr_in);

                sin.sin_addr = ip.ip_src;
                rt = rtalloc1_scoped((struct sockaddr *)&sin, 0, 0,
                    m->m_pkthdr.rcvif->if_index);
                sin.sin_addr = ip.ip_src;
                rt = rtalloc1_scoped((struct sockaddr *)&sin, 0, 0,
                    m->m_pkthdr.rcvif->if_index);


@@ -400,11 +408,11 @@ gif_encapcheck4(
                                RT_UNLOCK(rt);
                                rtfree(rt);
                        }
                                RT_UNLOCK(rt);
                                rtfree(rt);
                        }

-                       return 0;
+                       return (0);

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

-       return 32 * 2;
+       return (32 * 2);

 }
 }