xnu-6153.141.1.tar.gz

[apple/xnu.git] / bsd / netinet6 / dest6.c

diff --git a/bsd/netinet6/dest6.c b/bsd/netinet6/dest6.c
index c5b713b14bbe6432836b46d0ed06f79812781bce..48dc59cf16a41f760c6ebc9a9f0540a37f0d8df3 100644 (file)
--- a/bsd/netinet6/dest6.c
+++ b/bsd/netinet6/dest6.c
@@ -1,3 +1,30 @@
+/*
+ * Copyright (c) 2020 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/dest6.c,v 1.1.2.3 2001/07/03 11:01:49 ume Exp $      */
 /*     $KAME: dest6.c,v 1.27 2001/03/29 05:34:30 itojun Exp $  */
 
@@ -54,37 +81,21 @@
  * Destination options header processing.
  */
 int
-dest6_input(mp, offp, proto)
-       struct mbuf **mp;
-       int *offp, proto;
+dest6_input(struct mbuf **mp, int *offp, int proto)
 {
+#pragma unused(proto)
        struct mbuf *m = *mp;
-       int off = *offp, dstoptlen, optlen;
-       struct ip6_dest *dstopts;
-       u_int8_t *opt;
-       struct ip6_hdr *ip6;
-
-       ip6 = mtod(m, struct ip6_hdr *);
+       int off = *offp, dstoptlen = 0, optlen = 0;
+       struct ip6_dest *dstopts = NULL;
+       u_int8_t *opt = NULL;
 
        /* validation of the length of the header */
-#ifndef PULLDOWN_TEST
-       IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE);
+       IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), return IPPROTO_DONE);
        dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
-#else
-       IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts));
-       if (dstopts == NULL)
-               return IPPROTO_DONE;
-#endif
        dstoptlen = (dstopts->ip6d_len + 1) << 3;
 
-#ifndef PULLDOWN_TEST
-       IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE);
+       IP6_EXTHDR_CHECK(m, off, dstoptlen, return IPPROTO_DONE);
        dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
-#else
-       IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen);
-       if (dstopts == NULL)
-               return IPPROTO_DONE;
-#endif
        off += dstoptlen;
        dstoptlen -= sizeof(struct ip6_dest);
        opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
@@ -105,20 +116,22 @@ dest6_input(mp, offp, proto)
                        optlen = *(opt + 1) + 2;
                        break;
 
-               default:                /* unknown option */
+               default:                /* unknown option */
                        optlen = ip6_unknown_opt(opt, m,
                            opt - mtod(m, u_int8_t *));
-                       if (optlen == -1)
-                               return (IPPROTO_DONE);
+                       if (optlen == -1) {
+                               return IPPROTO_DONE;
+                       }
                        optlen += 2;
                        break;
                }
        }
-
+       *mp = m;
        *offp = off;
-       return (dstopts->ip6d_nxt);
+       return dstopts->ip6d_nxt;
 
-  bad:
+bad:
+       *mp = NULL;
        m_freem(m);
-       return (IPPROTO_DONE);
+       return IPPROTO_DONE;
 }