update icmp6 name lookup code to conform to 05 draft. previous code

was 03/05 chimera.

ping6: -n by default due to too many false error report due to too long
reverse query delay.

1 files changed, 334 insertions, 0 deletions

diff --git a/sys/kern/uipc_mbuf2.c b/sys/kern/uipc_mbuf2.c
new file mode 100644
index 00000000000..66b9ceaa0a2
--- /dev/null
+++ b/sys/kern/uipc_mbuf2.c
@@ -0,0 +1,334 @@
+/*	$OpenBSD: uipc_mbuf2.c,v 1.3 2000/06/12 17:24:27 itojun Exp $	*/
+/*	$KAME: uipc_mbuf2.c,v 1.15 2000/02/22 14:01:37 itojun Exp $	*/
+/*	$NetBSD: uipc_mbuf.c,v 1.40 1999/04/01 00:23:25 thorpej Exp $	*/
+
+/*
+ * Copyright (C) 1999 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.
+ */
+
+/*
+ * Copyright (c) 1982, 1986, 1988, 1991, 1993
+ *	The Regents of the University of California.  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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
+ *
+ *	@(#)uipc_mbuf.c	8.4 (Berkeley) 2/14/95
+ */
+
+#define PULLDOWN_STAT
+/*#define PULLDOWN_DEBUG*/
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#if defined(PULLDOWN_STAT) && defined(INET6)
+#include <netinet/in.h>
+#include <netinet/ip6.h>
+#include <netinet6/ip6_var.h>
+#endif
+
+/*
+ * ensure that [off, off + len) is contiguous on the mbuf chain "m".
+ * packet chain before "off" is kept untouched.
+ * if offp == NULL, the target will start at <retval, 0> on resulting chain.
+ * if offp != NULL, the target will start at <retval, *offp> on resulting chain.
+ *
+ * on error return (NULL return value), original "m" will be freed.
+ *
+ * XXX M_TRAILINGSPACE/M_LEADINGSPACE on shared cluster (sharedcluster)
+ */
+struct mbuf *
+m_pulldown(m, off, len, offp)
+	struct mbuf *m;
+	int off, len;
+	int *offp;
+{
+	struct mbuf *n, *o;
+	int hlen, tlen, olen;
+	int sharedcluster;
+#if defined(PULLDOWN_STAT) && defined(INET6)
+	static struct mbuf *prev = NULL;
+	int prevlen = 0, prevmlen = 0;
+#endif
+
+	/* check invalid arguments. */
+	if (m == NULL)
+		panic("m == NULL in m_pulldown()");
+	if (len > MCLBYTES) {
+		m_freem(m);
+		return NULL;	/* impossible */
+	}
+
+#if defined(PULLDOWN_STAT) && defined(INET6)
+	ip6stat.ip6s_pulldown++;
+#endif
+
+#if defined(PULLDOWN_STAT) && defined(INET6)
+	/* statistics for m_pullup */
+	ip6stat.ip6s_pullup++;
+	if (off + len > MHLEN)
+		ip6stat.ip6s_pullup_fail++;
+	else {
+		int dlen, mlen;
+
+		dlen = (prev == m) ? prevlen : m->m_len;
+		mlen = (prev == m) ? prevmlen : m->m_len + M_TRAILINGSPACE(m);
+
+		if (dlen >= off + len)
+			ip6stat.ip6s_pullup--; /* call will not be made! */
+		else if ((m->m_flags & M_EXT) != 0) {
+			ip6stat.ip6s_pullup_alloc++;
+			ip6stat.ip6s_pullup_copy++;
+		} else {
+			if (mlen >= off + len)
+				ip6stat.ip6s_pullup_copy++;
+			else {
+				ip6stat.ip6s_pullup_alloc++;
+				ip6stat.ip6s_pullup_copy++;
+			}
+		}
+
+		prevlen = off + len;
+		prevmlen = MHLEN;
+	}
+
+	/* statistics for m_pullup2 */
+	ip6stat.ip6s_pullup2++;
+	if (off + len > MCLBYTES)
+		ip6stat.ip6s_pullup2_fail++;
+	else {
+		int dlen, mlen;
+
+		dlen = (prev == m) ? prevlen : m->m_len;
+		mlen = (prev == m) ? prevmlen : m->m_len + M_TRAILINGSPACE(m);
+		prevlen = off + len;
+		prevmlen = mlen;
+
+		if (dlen >= off + len)
+			ip6stat.ip6s_pullup2--; /* call will not be made! */
+		else if ((m->m_flags & M_EXT) != 0) {
+			ip6stat.ip6s_pullup2_alloc++;
+			ip6stat.ip6s_pullup2_copy++;
+			prevmlen = (off + len > MHLEN) ? MCLBYTES : MHLEN;
+		} else {
+			if (mlen >= off + len)
+				ip6stat.ip6s_pullup2_copy++;
+			else {
+				ip6stat.ip6s_pullup2_alloc++;
+				ip6stat.ip6s_pullup2_copy++;
+				prevmlen = (off + len > MHLEN) ? MCLBYTES
+							       : MHLEN;
+			}
+		}
+	}
+
+	prev = m;
+#endif
+
+#ifdef PULLDOWN_DEBUG
+    {
+	struct mbuf *t;
+	printf("before:");
+	for (t = m; t; t = t->m_next)
+		printf(" %d", t->m_len);
+	printf("\n");
+    }
+#endif
+	n = m;
+	while (n != NULL && off > 0) {
+		if (n->m_len > off)
+			break;
+		off -= n->m_len;
+		n = n->m_next;
+	}
+	/* be sure to point non-empty mbuf */
+	while (n != NULL && n->m_len == 0)
+		n = n->m_next;
+	if (!n) {
+		m_freem(m);
+		return NULL;	/* mbuf chain too short */
+	}
+
+	/*
+	 * the target data is on <n, off>.
+	 * if we got enough data on the mbuf "n", we're done.
+	 */
+	if ((off == 0 || offp) && len <= n->m_len - off)
+		goto ok;
+
+#if defined(PULLDOWN_STAT) && defined(INET6)
+	ip6stat.ip6s_pulldown_copy++;
+#endif
+
+	/*
+	 * when len < n->m_len - off and off != 0, it is a special case.
+	 * len bytes from <n, off> sits in single mbuf, but the caller does
+	 * not like the starting position (off).
+	 * chop the current mbuf into two pieces, set off to 0.
+	 */
+	if (len < n->m_len - off) {
+		o = m_copym(n, off, n->m_len - off, M_DONTWAIT);
+		if (o == NULL) {
+			m_freem(m);
+			return NULL;	/* ENOBUFS */
+		}
+		n->m_len = off;
+		o->m_next = n->m_next;
+		n->m_next = o;
+		n = n->m_next;
+		off = 0;
+		goto ok;
+	}
+
+	/*
+	 * we need to take hlen from <n, off> and tlen from <n->m_next, 0>,
+	 * and construct contiguous mbuf with m_len == len.
+	 * note that hlen + tlen == len, and tlen > 0.
+	 */
+	hlen = n->m_len - off;
+	tlen = len - hlen;
+
+	/*
+	 * ensure that we have enough trailing data on mbuf chain.
+	 * if not, we can do nothing about the chain.
+	 */
+	olen = 0;
+	for (o = n->m_next; o != NULL; o = o->m_next)
+		olen += o->m_len;
+	if (hlen + olen < len) {
+		m_freem(m);
+		return NULL;	/* mbuf chain too short */
+	}
+
+	/*
+	 * easy cases first.
+	 * we need to use m_copydata() to get data from <n->m_next, 0>.
+	 */
+	if ((n->m_flags & M_EXT) == 0)
+		sharedcluster = 0;
+	else {
+		if (n->m_ext.ext_free)
+			sharedcluster = 1;
+		else if (mclrefcnt[mtocl(n->m_ext.ext_buf)] > 1)
+			sharedcluster = 1;
+		else
+			sharedcluster = 0;
+	}
+	if ((off == 0 || offp) && M_TRAILINGSPACE(n) >= tlen
+	 && !sharedcluster) {
+		m_copydata(n->m_next, 0, tlen, mtod(n, caddr_t) + n->m_len);
+		n->m_len += tlen;
+		m_adj(n->m_next, tlen);
+		goto ok;
+	}
+	if ((off == 0 || offp) && M_LEADINGSPACE(n->m_next) >= hlen
+	 && !sharedcluster) {
+		n->m_next->m_data -= hlen;
+		n->m_next->m_len += hlen;
+		bcopy(mtod(n, caddr_t) + off, mtod(n->m_next, caddr_t), hlen);
+		n->m_len -= hlen;
+		n = n->m_next;
+		off = 0;
+		goto ok;
+	}
+
+	/*
+	 * now, we need to do the hard way.  don't m_copy as there's no room
+	 * on both end.
+	 */
+#if defined(PULLDOWN_STAT) && defined(INET6)
+	ip6stat.ip6s_pulldown_alloc++;
+#endif
+	MGET(o, M_DONTWAIT, m->m_type);
+	if (o == NULL) {
+		m_freem(m);
+		return NULL;	/* ENOBUFS */
+	}
+	if (len > MHLEN) {	/* use MHLEN just for safety */
+		MCLGET(o, M_DONTWAIT);
+		if ((o->m_flags & M_EXT) == 0) {
+			m_freem(m);
+			m_free(o);
+			return NULL;	/* ENOBUFS */
+		}
+	}
+	/* get hlen from <n, off> into <o, 0> */
+	o->m_len = hlen;
+	bcopy(mtod(n, caddr_t) + off, mtod(o, caddr_t), hlen);
+	n->m_len -= hlen;
+	/* get tlen from <n->m_next, 0> into <o, hlen> */
+	m_copydata(n->m_next, 0, tlen, mtod(o, caddr_t) + o->m_len);
+	o->m_len += tlen;
+	m_adj(n->m_next, tlen);
+	o->m_next = n->m_next;
+	n->m_next = o;
+	n = o;
+	off = 0;
+
+ok:
+#ifdef PULLDOWN_DEBUG
+    {
+	struct mbuf *t;
+	printf("after:");
+	for (t = m; t; t = t->m_next)
+		printf("%c%d", t == n ? '*' : ' ', t->m_len);
+	printf(" (off=%d)\n", off);
+    }
+#endif
+	if (offp)
+		*offp = off;
+	return n;
+}