This patch from Bart Visscher <magick@linux-fan.com> adds

IPV6 support to busybox.  This patch does the following:
    * Add IPv6 support to libbb
    * Enable IPv6 interface address display
    * Add IPv6 config option
    * Adds ping6, an adaptation of the ping applet for IPv6
    * Adds support routines for ping6:
	- xgethostbyname2
	- create_icmp6_socket
    * Adds ifconfig support for IPv6
    * Add support IPv6 to netstat
    * Add IPv6 support to route
Thanks Bart!

1 files changed, 515 insertions, 0 deletions

diff --git a/networking/ping6.c b/networking/ping6.c
new file mode 100644
index 0000000..bff700c
--- /dev/null
+++ b/networking/ping6.c
@@ -0,0 +1,515 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * $Id: ping6.c,v 1.1 2002/07/03 11:46:34 andersen Exp $
+ * Mini ping implementation for busybox
+ *
+ * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * This version of ping is adapted from the ping in netkit-base 0.10,
+ * which is:
+ *
+ * Copyright (c) 1989 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Mike Muuss.
+ * 
+ * Original copyright notice is retained at the end of this file.
+ *
+ * This version is an adaptation of ping.c from busybox.
+ * The code was modified by Bart Visscher <magick@linux-fan.com>
+ */
+
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <sys/file.h>
+#include <sys/time.h>
+#include <sys/times.h>
+#include <sys/signal.h>
+
+#include <netinet/in.h>
+#include <netinet/ip6.h>
+#include <netinet/icmp6.h>
+#include <arpa/inet.h>
+#include <net/if.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stddef.h>				/* offsetof */
+#include "busybox.h"
+
+static const int DEFDATALEN = 56;
+static const int MAXIPLEN = 60;
+static const int MAXICMPLEN = 76;
+static const int MAXPACKET = 65468;
+#define	MAX_DUP_CHK	(8 * 128)
+static const int MAXWAIT = 10;
+static const int PINGINTERVAL = 1;		/* second */
+
+#define O_QUIET         (1 << 0)
+#define O_VERBOSE       (1 << 1)
+
+#define	A(bit)		rcvd_tbl[(bit)>>3]	/* identify byte in array */
+#define	B(bit)		(1 << ((bit) & 0x07))	/* identify bit in byte */
+#define	SET(bit)	(A(bit) |= B(bit))
+#define	CLR(bit)	(A(bit) &= (~B(bit)))
+#define	TST(bit)	(A(bit) & B(bit))
+
+static void ping(const char *host);
+
+/* simple version */
+#ifndef CONFIG_FEATURE_FANCY_PING6
+
+static void ping(const char *host)
+{
+	struct hostent *h;
+	struct sockaddr_in6 pingaddr;
+	struct icmp6_hdr *pkt;
+	int pingsock, c;
+	int sockopt;
+	char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
+
+	void noresp(int ign)
+	{
+		printf("No response from %s\n", h->h_name);
+		exit(0);
+	}
+
+	pingsock = create_icmp6_socket();
+
+	memset(&pingaddr, 0, sizeof(struct sockaddr_in));
+
+	pingaddr.sin6_family = AF_INET6;
+	h = xgethostbyname2(host, AF_INET6);
+	memcpy(&pingaddr.sin6_addr, h->h_addr, sizeof(pingaddr.sin6_addr));
+
+	pkt = (struct icmp6_hdr *) packet;
+	memset(pkt, 0, sizeof(packet));
+	pkt->icmp6_type = ICMP6_ECHO_REQUEST;
+
+	sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
+	setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, (char *) &sockopt,
+			   sizeof(sockopt));
+
+	c = sendto(pingsock, packet, sizeof(packet), 0,
+			   (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in6));
+
+	if (c < 0 || c != sizeof(packet))
+		perror_msg_and_die("sendto");
+
+	signal(SIGALRM, noresp);
+	alarm(5);					/* give the host 5000ms to respond */
+	/* listen for replies */
+	while (1) {
+		struct sockaddr_in6 from;
+		size_t fromlen = sizeof(from);
+
+		if ((c = recvfrom(pingsock, packet, sizeof(packet), 0,
+						  (struct sockaddr *) &from, &fromlen)) < 0) {
+			if (errno == EINTR)
+				continue;
+			perror_msg("recvfrom");
+			continue;
+		}
+		if (c >= 8) {			/* icmp6_hdr */
+			pkt = (struct icmp6_hdr *) packet;
+			if (pkt->icmp6_type == ICMP6_ECHO_REPLY)
+				break;
+		}
+	}
+	printf("%s is alive!\n", h->h_name);
+	return;
+}
+
+extern int ping6_main(int argc, char **argv)
+{
+	argc--;
+	argv++;
+	if (argc < 1)
+		show_usage();
+	ping(*argv);
+	return EXIT_SUCCESS;
+}
+
+#else /* ! CONFIG_FEATURE_FANCY_PING6 */
+/* full(er) version */
+static struct sockaddr_in6 pingaddr;
+static int pingsock = -1;
+static int datalen; /* intentionally uninitialized to work around gcc bug */
+static char* ifname;
+
+static long ntransmitted, nreceived, nrepeats, pingcount;
+static int myid, options;
+static unsigned long tmin = ULONG_MAX, tmax, tsum;
+static char rcvd_tbl[MAX_DUP_CHK / 8];
+
+#if CONFIG_FEATURE_FANCY_PING
+extern 
+#endif
+	struct hostent *hostent;
+
+static void sendping(int);
+static void pingstats(int);
+static void unpack(char *, int, struct sockaddr_in6 *, int);
+
+/**************************************************************************/
+
+static void pingstats(int junk)
+{
+	int status;
+
+	signal(SIGINT, SIG_IGN);
+
+	printf("\n--- %s ping statistics ---\n", hostent->h_name);
+	printf("%ld packets transmitted, ", ntransmitted);
+	printf("%ld packets received, ", nreceived);
+	if (nrepeats)
+		printf("%ld duplicates, ", nrepeats);
+	if (ntransmitted)
+		printf("%ld%% packet loss\n",
+			   (ntransmitted - nreceived) * 100 / ntransmitted);
+	if (nreceived)
+		printf("round-trip min/avg/max = %lu.%lu/%lu.%lu/%lu.%lu ms\n",
+			   tmin / 10, tmin % 10,
+			   (tsum / (nreceived + nrepeats)) / 10,
+			   (tsum / (nreceived + nrepeats)) % 10, tmax / 10, tmax % 10);
+	if (nreceived != 0)
+		status = EXIT_SUCCESS;
+	else
+		status = EXIT_FAILURE;
+	exit(status);
+}
+
+static void sendping(int junk)
+{
+	struct icmp6_hdr *pkt;
+	int i;
+	char packet[datalen + 8];
+
+	pkt = (struct icmp6_hdr *) packet;
+
+	pkt->icmp6_type = ICMP6_ECHO_REQUEST;
+	pkt->icmp6_code = 0;
+	pkt->icmp6_cksum = 0;
+	pkt->icmp6_seq = ntransmitted++;
+	pkt->icmp6_id = myid;
+	CLR(pkt->icmp6_seq % MAX_DUP_CHK);
+
+	gettimeofday((struct timeval *) &pkt->icmp6_data8[4], NULL);
+
+	i = sendto(pingsock, packet, sizeof(packet), 0,
+			   (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in6));
+
+	if (i < 0)
+		perror_msg_and_die("sendto");
+	else if ((size_t)i != sizeof(packet))
+		error_msg_and_die("ping wrote %d chars; %d expected", i,
+			   (int)sizeof(packet));
+
+	signal(SIGALRM, sendping);
+	if (pingcount == 0 || ntransmitted < pingcount) {	/* schedule next in 1s */
+		alarm(PINGINTERVAL);
+	} else {					/* done, wait for the last ping to come back */
+		/* todo, don't necessarily need to wait so long... */
+		signal(SIGALRM, pingstats);
+		alarm(MAXWAIT);
+	}
+}
+
+static char *icmp6_type_name (int id)
+{
+	switch (id) {
+	case ICMP6_DST_UNREACH:				return "Destination Unreachable";
+	case ICMP6_PACKET_TOO_BIG:			return "Packet too big";
+	case ICMP6_TIME_EXCEEDED:			return "Time Exceeded";
+	case ICMP6_PARAM_PROB:				return "Parameter Problem";
+	case ICMP6_ECHO_REPLY:				return "Echo Reply";
+	case ICMP6_ECHO_REQUEST:			return "Echo Request";
+	case ICMP6_MEMBERSHIP_QUERY:		return "Membership Query";
+	case ICMP6_MEMBERSHIP_REPORT:		return "Membership Report";
+	case ICMP6_MEMBERSHIP_REDUCTION:	return "Membership Reduction";
+	default: 							return "unknown ICMP type";
+	}
+}
+
+static void unpack(char *packet, int sz, struct sockaddr_in6 *from, int hoplimit)
+{
+	struct icmp6_hdr *icmppkt;
+	struct timeval tv, *tp;
+	int dupflag;
+	unsigned long triptime;
+	char buf[INET6_ADDRSTRLEN];
+
+	gettimeofday(&tv, NULL);
+
+	/* discard if too short */
+	if (sz < (datalen + sizeof(struct icmp6_hdr)))
+		return;
+
+	icmppkt = (struct icmp6_hdr *) packet;
+
+	if (icmppkt->icmp6_id != myid)
+	    return;				/* not our ping */
+
+	if (icmppkt->icmp6_type == ICMP6_ECHO_REPLY) {
+	    ++nreceived;
+		tp = (struct timeval *) &icmppkt->icmp6_data8[4];
+
+		if ((tv.tv_usec -= tp->tv_usec) < 0) {
+			--tv.tv_sec;
+			tv.tv_usec += 1000000;
+		}
+		tv.tv_sec -= tp->tv_sec;
+
+		triptime = tv.tv_sec * 10000 + (tv.tv_usec / 100);
+		tsum += triptime;
+		if (triptime < tmin)
+			tmin = triptime;
+		if (triptime > tmax)
+			tmax = triptime;
+
+		if (TST(icmppkt->icmp6_seq % MAX_DUP_CHK)) {
+			++nrepeats;
+			--nreceived;
+			dupflag = 1;
+		} else {
+			SET(icmppkt->icmp6_seq % MAX_DUP_CHK);
+			dupflag = 0;
+		}
+
+		if (options & O_QUIET)
+			return;
+
+		printf("%d bytes from %s: icmp6_seq=%u", sz,
+			   inet_ntop(AF_INET6, (struct in_addr6 *) &pingaddr.sin6_addr,
+						 buf, sizeof(buf)),
+			   icmppkt->icmp6_seq);
+		printf(" ttl=%d time=%lu.%lu ms", hoplimit, 
+			   triptime / 10, triptime % 10);
+		if (dupflag)
+			printf(" (DUP!)");
+		printf("\n");
+	} else 
+		if (icmppkt->icmp6_type != ICMP6_ECHO_REQUEST)
+			error_msg("Warning: Got ICMP %d (%s)",
+					icmppkt->icmp6_type, icmp6_type_name (icmppkt->icmp6_type));
+}
+
+static void ping(const char *host)
+{
+	char packet[datalen + MAXIPLEN + MAXICMPLEN];
+	char buf[INET6_ADDRSTRLEN];
+	int sockopt;
+	struct msghdr msg;
+	struct sockaddr_in6 from;
+	struct iovec iov;
+	char control_buf[CMSG_SPACE(36)];
+
+	pingsock = create_icmp6_socket();
+
+	memset(&pingaddr, 0, sizeof(struct sockaddr_in));
+
+	pingaddr.sin6_family = AF_INET6;
+	hostent = xgethostbyname2(host, AF_INET6);
+	if (hostent->h_addrtype != AF_INET6)
+		error_msg_and_die("unknown address type; only AF_INET6 is currently supported.");
+
+	memcpy(&pingaddr.sin6_addr, hostent->h_addr, sizeof(pingaddr.sin6_addr));
+
+#ifdef ICMP6_FILTER
+	{
+		struct icmp6_filter filt;
+		if (!(options & O_VERBOSE)) {
+			ICMP6_FILTER_SETBLOCKALL(&filt);
+#if 0
+			if ((options & F_FQDN) || (options & F_FQDNOLD) ||
+				(options & F_NODEADDR) || (options & F_SUPTYPES))
+				ICMP6_FILTER_SETPASS(ICMP6_NI_REPLY, &filt);
+			else
+#endif
+				ICMP6_FILTER_SETPASS(ICMP6_ECHO_REPLY, &filt);
+		} else {
+			ICMP6_FILTER_SETPASSALL(&filt);
+		}
+		if (setsockopt(pingsock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
+					   sizeof(filt)) < 0)
+			error_msg_and_die("setsockopt(ICMP6_FILTER)");
+	}
+#endif /*ICMP6_FILTER*/
+
+	/* enable broadcast pings */
+	sockopt = 1;
+	setsockopt(pingsock, SOL_SOCKET, SO_BROADCAST, (char *) &sockopt,
+			   sizeof(sockopt));
+
+	/* set recv buf for broadcast pings */
+	sockopt = 48 * 1024;
+	setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, (char *) &sockopt,
+			   sizeof(sockopt));
+
+	sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
+	setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, (char *) &sockopt,
+			   sizeof(sockopt));
+
+	sockopt = 1;
+	setsockopt(pingsock, SOL_IPV6, IPV6_HOPLIMIT, (char *) &sockopt,
+			   sizeof(sockopt));
+
+	if (ifname) {
+		if ((pingaddr.sin6_scope_id = if_nametoindex(ifname)) == 0)
+			error_msg_and_die("%s: invalid interface name", ifname);
+	}
+
+	printf("PING %s (%s): %d data bytes\n",
+	           hostent->h_name,
+			   inet_ntop(AF_INET6, (struct in_addr6 *) &pingaddr.sin6_addr,
+						 buf, sizeof(buf)),
+		   datalen);
+
+	signal(SIGINT, pingstats);
+
+	/* start the ping's going ... */
+	sendping(0);
+
+	/* listen for replies */
+	msg.msg_name=&from;
+	msg.msg_namelen=sizeof(from);
+	msg.msg_iov=&iov;
+	msg.msg_iovlen=1;
+	msg.msg_control=control_buf;
+	iov.iov_base=packet;
+	iov.iov_len=sizeof(packet);
+	while (1) {
+		int c;
+		struct cmsghdr *cmsgptr = NULL;
+		int hoplimit=-1;
+		msg.msg_controllen=sizeof(control_buf);
+
+		if ((c = recvmsg(pingsock, &msg, 0)) < 0) {
+			if (errno == EINTR)
+				continue;
+			perror_msg("recvfrom");
+			continue;
+		}
+		for (cmsgptr = CMSG_FIRSTHDR(&msg); cmsgptr != NULL;
+			 cmsgptr = CMSG_NXTHDR(&msg, cmsgptr)) {
+			if (cmsgptr->cmsg_level == SOL_IPV6 &&
+				cmsgptr->cmsg_type == IPV6_HOPLIMIT ) {
+				hoplimit=*(int*)CMSG_DATA(cmsgptr);
+			}
+		}
+		unpack(packet, c, &from, hoplimit);
+		if (pingcount > 0 && nreceived >= pingcount)
+			break;
+	}
+	pingstats(0);
+}
+
+extern int ping6_main(int argc, char **argv)
+{
+	char *thisarg;
+
+	datalen = DEFDATALEN; /* initialized here rather than in global scope to work around gcc bug */
+
+	argc--;
+	argv++;
+	options = 0;
+	/* Parse any options */
+	while (argc >= 1 && **argv == '-') {
+		thisarg = *argv;
+		thisarg++;
+		switch (*thisarg) {
+		case 'v':
+			options &= ~O_QUIET;
+			options |= O_VERBOSE;
+			break;
+		case 'q':
+			options &= ~O_VERBOSE;
+			options |= O_QUIET;
+			break;
+		case 'c':
+			if (--argc <= 0)
+			        show_usage();
+			argv++;
+			pingcount = atoi(*argv);
+			break;
+		case 's':
+			if (--argc <= 0)
+			        show_usage();
+			argv++;
+			datalen = atoi(*argv);
+			break;
+		case 'I':
+			if (--argc <= 0)
+			        show_usage();
+			argv++;
+			ifname = *argv;
+			break;
+		default:
+			show_usage();
+		}
+		argc--;
+		argv++;
+	}
+	if (argc < 1)
+		show_usage();
+
+	myid = getpid() & 0xFFFF;
+	ping(*argv);
+	return EXIT_SUCCESS;
+}
+#endif /* ! CONFIG_FEATURE_FANCY_PING6 */
+
+/*
+ * Copyright (c) 1989 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Mike Muuss.
+ *
+ * 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. <BSD Advertising Clause omitted per the July 22, 1999 licensing change 
+ *		ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change> 
+ *
+ * 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.
+ */