1 files changed, 226 insertions, 1 deletions

diff --git a/src/lib/libc/net/ip6opt.c b/src/lib/libc/net/ip6opt.c
index d3d68a54bf..b215f9ac3e 100644
--- a/src/lib/libc/net/ip6opt.c
+++ b/src/lib/libc/net/ip6opt.c
@@ -1,4 +1,5 @@
-/*      $OpenBSD: ip6opt.c,v 1.3 2006/12/08 21:32:59 itojun Exp $       */
+/*      $OpenBSD: ip6opt.c,v 1.4 2006/12/09 01:12:28 itojun Exp $       */
+/*      $KAME: ip6opt.c,v 1.18 2005/06/15 07:11:35 keiichi Exp $        */
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -103,8 +104,10 @@ inet6_option_append(struct cmsghdr *cmsg, const u_int8_t *typep, int multx,
                 return (-1);
         if (plusy < 0 || plusy > 7)
                 return (-1);
+#if 0
         if (typep[0] > 255)
                 return (-1);
+#endif
 
         /*
          * If this is the first option, allocate space for the
@@ -369,3 +372,225 @@ inet6_insert_padopt(u_char *p, int len)
                  return;
         }
 }
+
+/*
+ * The following functions are defined in RFC3542, which is a successor
+ * of RFC2292.
+ */
+
+int
+inet6_opt_init(void *extbuf, socklen_t extlen)
+{
+        struct ip6_ext *ext = (struct ip6_ext *)extbuf;
+
+        if (extlen < 0 || (extlen % 8))
+                return (-1);
+
+        if (ext) {
+                if (extlen == 0)
+                        return (-1);
+                ext->ip6e_len = (extlen >> 3) - 1;
+        }
+
+        return (2);             /* sizeof the next and the length fields */
+}
+
+int
+inet6_opt_append(void *extbuf, socklen_t extlen, int offset, u_int8_t type,
+                 socklen_t len, u_int8_t align, void **databufp)
+{
+        int currentlen = offset, padlen = 0;
+
+        /*
+         * The option type must have a value from 2 to 255, inclusive.
+         * (0 and 1 are reserved for the Pad1 and PadN options, respectively.)
+         */
+#if 0 /* always false */
+        if (type < 2 || type > 255)
+#else
+        if (type < 2)
+#endif
+                return (-1);
+
+        /*
+         * The option data length must have a value between 0 and 255,
+         * inclusive, and is the length of the option data that follows.
+         */
+        if (len < 0 || len > 255)
+                return (-1);
+
+        /*
+         * The align parameter must have a value of 1, 2, 4, or 8.
+         * The align value can not exceed the value of len.
+         */
+        if (align != 1 && align != 2 && align != 4 && align != 8)
+                return (-1);
+        if (align > len)
+                return (-1);
+
+        /* Calculate the padding length. */
+        currentlen += 2 + len;  /* 2 means "type + len" */
+        if (currentlen % align)
+                padlen = align - (currentlen % align);
+
+        /* The option must fit in the extension header buffer. */
+        currentlen += padlen;
+        if (extlen &&           /* XXX: right? */
+            currentlen > extlen)
+                return (-1);
+
+        if (extbuf) {
+                u_int8_t *optp = (u_int8_t *)extbuf + offset;
+
+                if (padlen == 1) {
+                        /* insert a Pad1 option */
+                        *optp = IP6OPT_PAD1;
+                        optp++;
+                } else if (padlen > 0) {
+                        /* insert a PadN option for alignment */
+                        *optp++ = IP6OPT_PADN;
+                        *optp++ = padlen - 2;
+                        memset(optp, 0, padlen - 2);
+                        optp += (padlen - 2);
+                }
+
+                *optp++ = type;
+                *optp++ = len;
+
+                *databufp = optp;
+        }
+
+        return (currentlen);
+}
+
+int
+inet6_opt_finish(void *extbuf, socklen_t extlen, int offset)
+{
+        int updatelen = offset > 0 ? (1 + ((offset - 1) | 7)) : 0;;
+
+        if (extbuf) {
+                u_int8_t *padp;
+                int padlen = updatelen - offset;
+
+                if (updatelen > extlen)
+                        return (-1);
+
+                padp = (u_int8_t *)extbuf + offset;
+                if (padlen == 1)
+                        *padp = IP6OPT_PAD1;
+                else if (padlen > 0) {
+                        *padp++ = IP6OPT_PADN;
+                        *padp++ = (padlen - 2);
+                        memset(padp, 0, padlen - 2);
+                }
+        }
+
+        return (updatelen);
+}
+
+int
+inet6_opt_set_val(void *databuf, int offset, void *val, socklen_t vallen)
+{
+
+        memcpy((u_int8_t *)databuf + offset, val, vallen);
+        return (offset + vallen);
+}
+
+int
+inet6_opt_next(void *extbuf, socklen_t extlen, int offset, u_int8_t *typep,
+               socklen_t *lenp, void **databufp)
+{
+        u_int8_t *optp, *lim;
+        int optlen;
+
+        /* Validate extlen. XXX: is the variable really necessary?? */
+        if (extlen == 0 || (extlen % 8))
+                return (-1);
+        lim = (u_int8_t *)extbuf + extlen;
+
+        /*
+         * If this is the first time this function called for this options
+         * header, simply return the 1st option.
+         * Otherwise, search the option list for the next option.
+         */
+        if (offset == 0)
+                optp = (u_int8_t *)((struct ip6_hbh *)extbuf + 1);
+        else
+                optp = (u_int8_t *)extbuf + offset;
+
+        /* Find the next option skipping any padding options. */
+        while (optp < lim) {
+                switch(*optp) {
+                case IP6OPT_PAD1:
+                        optp++;
+                        break;
+                case IP6OPT_PADN:
+                        if ((optlen = ip6optlen(optp, lim)) == 0)
+                                goto optend;
+                        optp += optlen;
+                        break;
+                default:        /* found */
+                        if ((optlen = ip6optlen(optp, lim)) == 0)
+                                goto optend;
+                        *typep = *optp;
+                        *lenp = optlen - 2;
+                        *databufp = optp + 2;
+                        return (optp + optlen - (u_int8_t *)extbuf);
+                }
+        }
+
+  optend:
+        *databufp = NULL; /* for safety */
+        return (-1);
+}
+
+int
+inet6_opt_find(void *extbuf, socklen_t extlen, int offset, u_int8_t type,
+               socklen_t *lenp, void **databufp)
+{
+        u_int8_t *optp, *lim;
+        int optlen;
+
+        /* Validate extlen. XXX: is the variable really necessary?? */
+        if (extlen == 0 || (extlen % 8))
+                return (-1);
+        lim = (u_int8_t *)extbuf + extlen;
+
+        /*
+         * If this is the first time this function called for this options
+         * header, simply return the 1st option.
+         * Otherwise, search the option list for the next option.
+         */
+        if (offset == 0)
+                optp = (u_int8_t *)((struct ip6_hbh *)extbuf + 1);
+        else
+                optp = (u_int8_t *)extbuf + offset;
+
+        /* Find the specified option */
+        while (optp < lim) {
+                if ((optlen = ip6optlen(optp, lim)) == 0)
+                        goto optend;
+
+                if (*optp == type) { /* found */
+                        *lenp = optlen - 2;
+                        *databufp = optp + 2;
+                        return (optp + optlen - (u_int8_t *)extbuf);
+                }
+
+                optp += optlen;
+        }
+
+  optend:
+        *databufp = NULL; /* for safety */
+        return (-1);
+}
+
+int
+inet6_opt_get_val(void *databuf, int offset, void *val, socklen_t vallen)
+{
+
+        /* we can't assume alignment here */
+        memcpy(val, (u_int8_t *)databuf + offset, vallen);
+
+        return (offset + vallen);
+}