1 files changed, 298 insertions, 0 deletions

diff --git a/src/lib/libc/net/rthdr.c b/src/lib/libc/net/rthdr.c
new file mode 100644
index 0000000000..2dff59668e
--- /dev/null
+++ b/src/lib/libc/net/rthdr.c
@@ -0,0 +1,298 @@
+/*      $OpenBSD: rthdr.c,v 1.1 1999/12/11 08:09:11 itojun Exp $        */
+
+/*
+ * 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.
+ */
+
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include <netinet/in.h>
+#include <netinet/ip6.h>
+
+#include <string.h>
+#include <stdio.h>
+
+size_t
+inet6_rthdr_space(type, seg)
+    int type, seg;
+{
+    switch(type) {
+     case IPV6_RTHDR_TYPE_0:
+         if (seg < 1 || seg > 23)
+             return(0);
+         return(CMSG_SPACE(sizeof(struct in6_addr) * (seg - 1)
+                           + sizeof(struct ip6_rthdr0)));
+     default:
+#ifdef DEBUG
+         fprintf(stderr, "inet6_rthdr_space: unknown type(%d)\n", type);
+#endif 
+         return(0);
+    }
+}
+
+struct cmsghdr *
+inet6_rthdr_init(bp, type)
+    void *bp;
+    int type;
+{
+    register struct cmsghdr *ch = (struct cmsghdr *)bp;
+    register struct ip6_rthdr *rthdr = (struct ip6_rthdr *)(ch + 1);
+
+    ch->cmsg_level = IPPROTO_IPV6;
+    ch->cmsg_type = IPV6_RTHDR;
+
+    switch(type) {
+     case IPV6_RTHDR_TYPE_0:
+         ch->cmsg_len = CMSG_LEN(sizeof(struct ip6_rthdr0) - sizeof(struct in6_addr));
+         bzero(rthdr, sizeof(struct ip6_rthdr0));
+         rthdr->ip6r_type = IPV6_RTHDR_TYPE_0;
+         return(ch);
+     default:
+#ifdef DEBUG
+         fprintf(stderr, "inet6_rthdr_init: unknown type(%d)\n", type);
+#endif 
+         return(NULL);
+    }
+}
+
+int
+inet6_rthdr_add(cmsg, addr, flags)
+    struct cmsghdr *cmsg;
+    const struct in6_addr *addr;
+    u_int flags;
+{
+    register struct ip6_rthdr *rthdr = (struct ip6_rthdr *)(cmsg + 1);
+
+    switch(rthdr->ip6r_type) {
+     case IPV6_RTHDR_TYPE_0:
+     {
+         struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
+         if (flags != IPV6_RTHDR_LOOSE && flags != IPV6_RTHDR_STRICT) {
+#ifdef DEBUG
+             fprintf(stderr, "inet6_rthdr_add: unsupported flag(%d)\n", flags);
+#endif 
+             return(-1);
+         }
+         if (rt0->ip6r0_segleft == 23) {
+#ifdef DEBUG
+             fprintf(stderr, "inet6_rthdr_add: segment overflow\n");
+#endif 
+             return(-1);
+         }
+         if (flags == IPV6_RTHDR_STRICT) {
+             int c, b;
+             c = rt0->ip6r0_segleft / 8;
+             b = rt0->ip6r0_segleft % 8;
+             rt0->ip6r0_slmap[c] |= (1 << (7 - b));
+         }
+         rt0->ip6r0_segleft++;
+         bcopy(addr, (caddr_t)rt0 + ((rt0->ip6r0_len + 1) << 3),
+               sizeof(struct in6_addr));
+         rt0->ip6r0_len += sizeof(struct in6_addr) >> 3;
+         cmsg->cmsg_len = CMSG_LEN((rt0->ip6r0_len + 1) << 3);
+         break;
+     }
+     default:
+#ifdef DEBUG
+         fprintf(stderr, "inet6_rthdr_add: unknown type(%d)\n",
+                 rthdr->ip6r_type);
+#endif 
+         return(-1);
+    }
+
+    return(0);
+}
+
+int
+inet6_rthdr_lasthop(cmsg, flags)
+    struct cmsghdr *cmsg;
+    unsigned int flags;
+{
+    register struct ip6_rthdr *rthdr = (struct ip6_rthdr *)(cmsg + 1);
+
+    switch(rthdr->ip6r_type) {
+     case IPV6_RTHDR_TYPE_0:
+     {
+         struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
+         if (flags != IPV6_RTHDR_LOOSE && flags != IPV6_RTHDR_STRICT) {
+#ifdef DEBUG
+             fprintf(stderr, "inet6_rthdr_lasthop: unsupported flag(%d)\n", flags);
+#endif 
+             return(-1);
+         }
+         if (rt0->ip6r0_segleft > 23) {
+#ifdef DEBUG
+             fprintf(stderr, "inet6_rthdr_add: segment overflow\n");
+#endif 
+             return(-1);
+         }
+         if (flags == IPV6_RTHDR_STRICT) {
+             int c, b;
+             c = rt0->ip6r0_segleft / 8;
+             b = rt0->ip6r0_segleft % 8;
+             rt0->ip6r0_slmap[c] |= (1 << (7 - b));
+         }
+         break;
+     }
+     default:
+#ifdef DEBUG
+         fprintf(stderr, "inet6_rthdr_lasthop: unknown type(%d)\n",
+                 rthdr->ip6r_type);
+#endif 
+         return(-1);
+    }
+
+    return(0);
+}
+
+#if 0
+int
+inet6_rthdr_reverse(in, out)
+    const struct cmsghdr *in;
+    struct cmsghdr *out;
+{
+#ifdef DEBUG
+    fprintf(stderr, "inet6_rthdr_reverse: not implemented yet\n");
+#endif 
+    return -1;
+}
+#endif
+
+int
+inet6_rthdr_segments(cmsg)
+    const struct cmsghdr *cmsg;
+{
+    register struct ip6_rthdr *rthdr = (struct ip6_rthdr *)(cmsg + 1);
+
+    switch(rthdr->ip6r_type) {
+    case IPV6_RTHDR_TYPE_0:
+      {
+        struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
+
+        if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len) {
+#ifdef DEBUG
+            fprintf(stderr, "inet6_rthdr_segments: invalid size(%d)\n",
+                rt0->ip6r0_len);
+#endif 
+            return -1;
+        }
+
+        return (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
+      }
+
+    default:
+#ifdef DEBUG
+        fprintf(stderr, "inet6_rthdr_segments: unknown type(%d)\n",
+            rthdr->ip6r_type);
+#endif 
+        return -1;
+    }
+}
+
+struct in6_addr *
+inet6_rthdr_getaddr(cmsg, index)
+    struct cmsghdr *cmsg;
+    int index;
+{
+    register struct ip6_rthdr *rthdr = (struct ip6_rthdr *)(cmsg + 1);
+
+    switch(rthdr->ip6r_type) {
+    case IPV6_RTHDR_TYPE_0:
+      {
+        struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
+        int naddr;
+
+        if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len) {
+#ifdef DEBUG
+            fprintf(stderr, "inet6_rthdr_getaddr: invalid size(%d)\n",
+                rt0->ip6r0_len);
+#endif 
+            return NULL;
+        }
+        naddr = (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
+        if (index <= 0 || naddr < index) {
+#ifdef DEBUG
+            fprintf(stderr, "inet6_rthdr_getaddr: invalid index(%d)\n", index);
+#endif 
+            return NULL;
+        }
+        return &rt0->ip6r0_addr[index - 1];
+      }
+
+    default:
+#ifdef DEBUG
+        fprintf(stderr, "inet6_rthdr_getaddr: unknown type(%d)\n",
+            rthdr->ip6r_type);
+#endif 
+        return NULL;
+    }
+}
+
+int
+inet6_rthdr_getflags(cmsg, index)
+    const struct cmsghdr *cmsg;
+    int index;
+{
+    register struct ip6_rthdr *rthdr = (struct ip6_rthdr *)(cmsg + 1);
+
+    switch(rthdr->ip6r_type) {
+    case IPV6_RTHDR_TYPE_0:
+      {
+        struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
+        int naddr;
+
+        if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len) {
+#ifdef DEBUG
+            fprintf(stderr, "inet6_rthdr_getflags: invalid size(%d)\n",
+                rt0->ip6r0_len);
+#endif 
+            return -1;
+        }
+        naddr = (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
+        if (index < 0 || naddr < index) {
+#ifdef DEBUG
+            fprintf(stderr, "inet6_rthdr_getflags: invalid index(%d)\n", index);
+#endif 
+            return -1;
+        }
+        if (rt0->ip6r0_slmap[index / 8] & (0x80 >> (index % 8)))
+            return IPV6_RTHDR_STRICT;
+        else
+            return IPV6_RTHDR_LOOSE;
+      }
+
+    default:
+#ifdef DEBUG
+        fprintf(stderr, "inet6_rthdr_getflags: unknown type(%d)\n",
+            rthdr->ip6r_type);
+#endif 
+        return -1;
+    }
+}