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-rw-r--r--sys/lib/libsa/ip.c190
1 files changed, 190 insertions, 0 deletions
diff --git a/sys/lib/libsa/ip.c b/sys/lib/libsa/ip.c
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+++ b/sys/lib/libsa/ip.c
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+/* $NetBSD: ip.c,v 1.1 2011/05/11 16:23:40 zoltan Exp $ */
+
+/*
+ * Copyright (c) 1992 Regents of the University of California.
+ * Copyright (c) 2010 Zoltan Arnold NAGY
+ * All rights reserved.
+ *
+ * This software was developed by the Computer Systems Engineering group
+ * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
+ * contributed to Berkeley.
+ *
+ * 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, Lawrence Berkeley Laboratory 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.
+ *
+ */
+
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <net/if.h>
+#include <net/if_ether.h>
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/ip_var.h>
+#include <netinet/udp.h>
+#include <netinet/udp_var.h>
+
+#ifdef _STANDALONE
+#include <lib/libkern/libkern.h>
+#else
+#include <string.h>
+#endif
+
+#include "stand.h"
+#include "net.h"
+
+/*
+ * sends an IP packet, if it's alredy constructed
+*/
+static ssize_t
+_sendip(struct iodesc * d, struct ip * ip, size_t len)
+{
+ u_char *ea;
+
+ if (ip->ip_dst.s_addr == INADDR_BROADCAST || ip->ip_src.s_addr == 0 ||
+ netmask == 0 || SAMENET(ip->ip_src, ip->ip_dst, netmask)) {
+ ea = arpwhohas(d, ip->ip_dst);
+ } else {
+ ea = arpwhohas(d, gateip);
+ }
+
+ return sendether(d, ip, len, ea, ETHERTYPE_IP);
+}
+
+/*
+ * fills out the IP header
+ * Caller must leave room for ethernet, ip and udp headers in front!
+*/
+ssize_t
+sendip(struct iodesc * d, void *pkt, size_t len, u_int8_t proto)
+{
+ ssize_t cc;
+ struct ip *ip;
+
+ ip = (struct ip *) pkt - 1;
+ len += sizeof(*ip);
+
+ (void) memset(ip, 0, sizeof(*ip));
+
+ ip->ip_v = IPVERSION;
+ ip->ip_hl = sizeof(*ip) >> 2;
+ ip->ip_len = htons(len);
+ ip->ip_p = proto;
+ ip->ip_ttl = IPDEFTTL;
+ ip->ip_src = d->myip;
+ ip->ip_dst = d->destip;
+ ip->ip_sum = ip_cksum(ip, sizeof(*ip));
+
+ cc = _sendip(d, ip, len);
+
+ if (cc == -1)
+ return -1;
+ if ((size_t) cc != len)
+ panic("sendip: bad write (%d != %d)", cc, len);
+ return (cc - (sizeof(*ip)));
+}
+
+/*
+ * reads an IP packet
+ * WARNING: the old version stripped the IP options, if there were
+ * any. Because we have absolutely no idea if the upper layer needs
+ * these or not, it's best to leave them there.
+ *
+ * The size returned is the size indicated in the header.
+ */
+ssize_t
+readip(struct iodesc * d, void *pkt, size_t len, time_t tleft, u_int8_t proto)
+{
+ ssize_t n;
+ size_t hlen;
+ struct ip *ip;
+ u_int16_t etype;
+
+ ip = (struct ip *) pkt - 1;
+
+ n = readether(d, ip, len + sizeof(*ip), tleft, &etype);
+ if (n == -1 || (size_t) n < sizeof(*ip))
+ return -1;
+
+ if (etype == ETHERTYPE_ARP) {
+ struct arphdr *ah = (void *) ip;
+ if (ah->ar_op == htons(ARPOP_REQUEST)) {
+ /* Send ARP reply */
+ arp_reply(d, ah);
+ }
+ return -1;
+ }
+
+ if (etype != ETHERTYPE_IP) {
+#ifdef NET_DEBUG
+ if (debug)
+ printf("readip: not IP. ether_type=%x\n", etype);
+#endif
+ return -1;
+ }
+
+ /* Check ip header */
+ if (ip->ip_v != IPVERSION ||
+ ip->ip_p != proto) { /* half char */
+#ifdef NET_DEBUG
+ if (debug) {
+ printf("readip: wrong IP version or wrong proto "
+ "ip_v=%d ip_p=%d\n", ip->ip_v, ip->ip_p);
+ }
+#endif
+ return -1;
+ }
+
+ hlen = ip->ip_hl << 2;
+ if (hlen < sizeof(*ip) || ip_cksum(ip, hlen) != 0) {
+#ifdef NET_DEBUG
+ if (debug)
+ printf("readip: short hdr or bad cksum.\n");
+#endif
+ return -1;
+ }
+ if (n < ntohs(ip->ip_len)) {
+#ifdef NET_DEBUG
+ if (debug)
+ printf("readip: bad length %d < %d.\n",
+ (int) n, ntohs(ip->ip_len));
+#endif
+ return -1;
+ }
+ if (d->myip.s_addr && ip->ip_dst.s_addr != d->myip.s_addr) {
+#ifdef NET_DEBUG
+ if (debug) {
+ printf("readip: bad saddr %s != ", inet_ntoa(d->myip));
+ printf("%s\n", inet_ntoa(ip->ip_dst));
+ }
+#endif
+ return -1;
+ }
+ return (ntohs(ip->ip_len) - 20);
+}