root / slirp / ip_input.c @ 1de7afc9
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/*
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* Copyright (c) 1982, 1986, 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ip_input.c 8.2 (Berkeley) 1/4/94
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* ip_input.c,v 1.11 1994/11/16 10:17:08 jkh Exp
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*/
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/*
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* Changes and additions relating to SLiRP are
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* Copyright (c) 1995 Danny Gasparovski.
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*
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* Please read the file COPYRIGHT for the
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* terms and conditions of the copyright.
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*/
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#include <slirp.h> |
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#include <qemu/osdep.h> |
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#include "ip_icmp.h" |
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|
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static struct ip *ip_reass(Slirp *slirp, struct ip *ip, struct ipq *fp); |
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static void ip_freef(Slirp *slirp, struct ipq *fp); |
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static void ip_enq(register struct ipasfrag *p, |
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register struct ipasfrag *prev); |
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static void ip_deq(register struct ipasfrag *p); |
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/*
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* IP initialization: fill in IP protocol switch table.
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* All protocols not implemented in kernel go to raw IP protocol handler.
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*/
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void
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ip_init(Slirp *slirp) |
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{ |
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slirp->ipq.ip_link.next = slirp->ipq.ip_link.prev = &slirp->ipq.ip_link; |
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udp_init(slirp); |
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tcp_init(slirp); |
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icmp_init(slirp); |
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} |
63 |
|
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void ip_cleanup(Slirp *slirp)
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{ |
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udp_cleanup(slirp); |
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tcp_cleanup(slirp); |
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icmp_cleanup(slirp); |
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} |
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|
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/*
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* Ip input routine. Checksum and byte swap header. If fragmented
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* try to reassemble. Process options. Pass to next level.
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*/
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void
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ip_input(struct mbuf *m)
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{ |
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Slirp *slirp = m->slirp; |
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register struct ip *ip; |
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int hlen;
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DEBUG_CALL("ip_input");
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DEBUG_ARG("m = %lx", (long)m); |
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DEBUG_ARG("m_len = %d", m->m_len);
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if (m->m_len < sizeof (struct ip)) { |
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return;
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} |
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ip = mtod(m, struct ip *);
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if (ip->ip_v != IPVERSION) {
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goto bad;
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} |
95 |
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hlen = ip->ip_hl << 2;
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if (hlen<sizeof(struct ip ) || hlen>m->m_len) {/* min header length */ |
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goto bad; /* or packet too short */ |
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} |
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|
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/* keep ip header intact for ICMP reply
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* ip->ip_sum = cksum(m, hlen);
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* if (ip->ip_sum) {
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*/
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if(cksum(m,hlen)) {
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goto bad;
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} |
108 |
|
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/*
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* Convert fields to host representation.
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*/
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NTOHS(ip->ip_len); |
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if (ip->ip_len < hlen) {
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goto bad;
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} |
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NTOHS(ip->ip_id); |
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NTOHS(ip->ip_off); |
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|
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/*
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* Check that the amount of data in the buffers
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* is as at least much as the IP header would have us expect.
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* Trim mbufs if longer than we expect.
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* Drop packet if shorter than we expect.
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*/
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if (m->m_len < ip->ip_len) {
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goto bad;
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} |
128 |
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/* Should drop packet if mbuf too long? hmmm... */
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if (m->m_len > ip->ip_len)
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m_adj(m, ip->ip_len - m->m_len); |
132 |
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/* check ip_ttl for a correct ICMP reply */
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if(ip->ip_ttl==0) { |
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icmp_error(m, ICMP_TIMXCEED,ICMP_TIMXCEED_INTRANS, 0,"ttl"); |
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goto bad;
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} |
138 |
|
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/*
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* If offset or IP_MF are set, must reassemble.
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* Otherwise, nothing need be done.
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* (We could look in the reassembly queue to see
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* if the packet was previously fragmented,
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* but it's not worth the time; just let them time out.)
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*
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* XXX This should fail, don't fragment yet
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*/
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if (ip->ip_off &~ IP_DF) {
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register struct ipq *fp; |
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struct qlink *l;
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/*
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* Look for queue of fragments
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* of this datagram.
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*/
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for (l = slirp->ipq.ip_link.next; l != &slirp->ipq.ip_link;
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l = l->next) { |
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fp = container_of(l, struct ipq, ip_link);
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if (ip->ip_id == fp->ipq_id &&
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ip->ip_src.s_addr == fp->ipq_src.s_addr && |
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ip->ip_dst.s_addr == fp->ipq_dst.s_addr && |
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ip->ip_p == fp->ipq_p) |
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goto found;
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} |
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fp = NULL;
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found:
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/*
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* Adjust ip_len to not reflect header,
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* set ip_mff if more fragments are expected,
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* convert offset of this to bytes.
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*/
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ip->ip_len -= hlen; |
173 |
if (ip->ip_off & IP_MF)
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ip->ip_tos |= 1;
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else
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ip->ip_tos &= ~1;
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ip->ip_off <<= 3;
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/*
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* If datagram marked as having more fragments
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* or if this is not the first fragment,
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* attempt reassembly; if it succeeds, proceed.
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*/
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if (ip->ip_tos & 1 || ip->ip_off) { |
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ip = ip_reass(slirp, ip, fp); |
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if (ip == NULL) |
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return;
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m = dtom(slirp, ip); |
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} else
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if (fp)
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ip_freef(slirp, fp); |
193 |
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} else
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ip->ip_len -= hlen; |
196 |
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/*
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* Switch out to protocol's input routine.
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*/
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switch (ip->ip_p) {
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case IPPROTO_TCP:
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tcp_input(m, hlen, (struct socket *)NULL); |
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break;
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case IPPROTO_UDP:
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udp_input(m, hlen); |
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break;
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case IPPROTO_ICMP:
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icmp_input(m, hlen); |
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break;
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default:
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m_free(m); |
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} |
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return;
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bad:
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m_free(m); |
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} |
217 |
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#define iptofrag(P) ((struct ipasfrag *)(((char*)(P)) - sizeof(struct qlink))) |
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#define fragtoip(P) ((struct ip*)(((char*)(P)) + sizeof(struct qlink))) |
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/*
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* Take incoming datagram fragment and try to
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* reassemble it into whole datagram. If a chain for
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* reassembly of this datagram already exists, then it
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* is given as fp; otherwise have to make a chain.
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*/
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static struct ip * |
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ip_reass(Slirp *slirp, struct ip *ip, struct ipq *fp) |
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{ |
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register struct mbuf *m = dtom(slirp, ip); |
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register struct ipasfrag *q; |
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int hlen = ip->ip_hl << 2; |
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int i, next;
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DEBUG_CALL("ip_reass");
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DEBUG_ARG("ip = %lx", (long)ip); |
236 |
DEBUG_ARG("fp = %lx", (long)fp); |
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DEBUG_ARG("m = %lx", (long)m); |
238 |
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/*
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* Presence of header sizes in mbufs
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* would confuse code below.
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* Fragment m_data is concatenated.
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*/
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m->m_data += hlen; |
245 |
m->m_len -= hlen; |
246 |
|
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/*
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* If first fragment to arrive, create a reassembly queue.
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*/
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250 |
if (fp == NULL) { |
251 |
struct mbuf *t = m_get(slirp);
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252 |
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if (t == NULL) { |
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goto dropfrag;
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} |
256 |
fp = mtod(t, struct ipq *);
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insque(&fp->ip_link, &slirp->ipq.ip_link); |
258 |
fp->ipq_ttl = IPFRAGTTL; |
259 |
fp->ipq_p = ip->ip_p; |
260 |
fp->ipq_id = ip->ip_id; |
261 |
fp->frag_link.next = fp->frag_link.prev = &fp->frag_link; |
262 |
fp->ipq_src = ip->ip_src; |
263 |
fp->ipq_dst = ip->ip_dst; |
264 |
q = (struct ipasfrag *)fp;
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goto insert;
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} |
267 |
|
268 |
/*
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* Find a segment which begins after this one does.
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*/
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for (q = fp->frag_link.next; q != (struct ipasfrag *)&fp->frag_link; |
272 |
q = q->ipf_next) |
273 |
if (q->ipf_off > ip->ip_off)
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break;
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275 |
|
276 |
/*
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277 |
* If there is a preceding segment, it may provide some of
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* our data already. If so, drop the data from the incoming
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* segment. If it provides all of our data, drop us.
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*/
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if (q->ipf_prev != &fp->frag_link) {
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282 |
struct ipasfrag *pq = q->ipf_prev;
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283 |
i = pq->ipf_off + pq->ipf_len - ip->ip_off; |
284 |
if (i > 0) { |
285 |
if (i >= ip->ip_len)
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goto dropfrag;
|
287 |
m_adj(dtom(slirp, ip), i); |
288 |
ip->ip_off += i; |
289 |
ip->ip_len -= i; |
290 |
} |
291 |
} |
292 |
|
293 |
/*
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294 |
* While we overlap succeeding segments trim them or,
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295 |
* if they are completely covered, dequeue them.
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*/
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297 |
while (q != (struct ipasfrag*)&fp->frag_link && |
298 |
ip->ip_off + ip->ip_len > q->ipf_off) { |
299 |
i = (ip->ip_off + ip->ip_len) - q->ipf_off; |
300 |
if (i < q->ipf_len) {
|
301 |
q->ipf_len -= i; |
302 |
q->ipf_off += i; |
303 |
m_adj(dtom(slirp, q), i); |
304 |
break;
|
305 |
} |
306 |
q = q->ipf_next; |
307 |
m_free(dtom(slirp, q->ipf_prev)); |
308 |
ip_deq(q->ipf_prev); |
309 |
} |
310 |
|
311 |
insert:
|
312 |
/*
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313 |
* Stick new segment in its place;
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314 |
* check for complete reassembly.
|
315 |
*/
|
316 |
ip_enq(iptofrag(ip), q->ipf_prev); |
317 |
next = 0;
|
318 |
for (q = fp->frag_link.next; q != (struct ipasfrag*)&fp->frag_link; |
319 |
q = q->ipf_next) { |
320 |
if (q->ipf_off != next)
|
321 |
return NULL; |
322 |
next += q->ipf_len; |
323 |
} |
324 |
if (((struct ipasfrag *)(q->ipf_prev))->ipf_tos & 1) |
325 |
return NULL; |
326 |
|
327 |
/*
|
328 |
* Reassembly is complete; concatenate fragments.
|
329 |
*/
|
330 |
q = fp->frag_link.next; |
331 |
m = dtom(slirp, q); |
332 |
|
333 |
q = (struct ipasfrag *) q->ipf_next;
|
334 |
while (q != (struct ipasfrag*)&fp->frag_link) { |
335 |
struct mbuf *t = dtom(slirp, q);
|
336 |
q = (struct ipasfrag *) q->ipf_next;
|
337 |
m_cat(m, t); |
338 |
} |
339 |
|
340 |
/*
|
341 |
* Create header for new ip packet by
|
342 |
* modifying header of first packet;
|
343 |
* dequeue and discard fragment reassembly header.
|
344 |
* Make header visible.
|
345 |
*/
|
346 |
q = fp->frag_link.next; |
347 |
|
348 |
/*
|
349 |
* If the fragments concatenated to an mbuf that's
|
350 |
* bigger than the total size of the fragment, then and
|
351 |
* m_ext buffer was alloced. But fp->ipq_next points to
|
352 |
* the old buffer (in the mbuf), so we must point ip
|
353 |
* into the new buffer.
|
354 |
*/
|
355 |
if (m->m_flags & M_EXT) {
|
356 |
int delta = (char *)q - m->m_dat; |
357 |
q = (struct ipasfrag *)(m->m_ext + delta);
|
358 |
} |
359 |
|
360 |
ip = fragtoip(q); |
361 |
ip->ip_len = next; |
362 |
ip->ip_tos &= ~1;
|
363 |
ip->ip_src = fp->ipq_src; |
364 |
ip->ip_dst = fp->ipq_dst; |
365 |
remque(&fp->ip_link); |
366 |
(void) m_free(dtom(slirp, fp));
|
367 |
m->m_len += (ip->ip_hl << 2);
|
368 |
m->m_data -= (ip->ip_hl << 2);
|
369 |
|
370 |
return ip;
|
371 |
|
372 |
dropfrag:
|
373 |
m_free(m); |
374 |
return NULL; |
375 |
} |
376 |
|
377 |
/*
|
378 |
* Free a fragment reassembly header and all
|
379 |
* associated datagrams.
|
380 |
*/
|
381 |
static void |
382 |
ip_freef(Slirp *slirp, struct ipq *fp)
|
383 |
{ |
384 |
register struct ipasfrag *q, *p; |
385 |
|
386 |
for (q = fp->frag_link.next; q != (struct ipasfrag*)&fp->frag_link; q = p) { |
387 |
p = q->ipf_next; |
388 |
ip_deq(q); |
389 |
m_free(dtom(slirp, q)); |
390 |
} |
391 |
remque(&fp->ip_link); |
392 |
(void) m_free(dtom(slirp, fp));
|
393 |
} |
394 |
|
395 |
/*
|
396 |
* Put an ip fragment on a reassembly chain.
|
397 |
* Like insque, but pointers in middle of structure.
|
398 |
*/
|
399 |
static void |
400 |
ip_enq(register struct ipasfrag *p, register struct ipasfrag *prev) |
401 |
{ |
402 |
DEBUG_CALL("ip_enq");
|
403 |
DEBUG_ARG("prev = %lx", (long)prev); |
404 |
p->ipf_prev = prev; |
405 |
p->ipf_next = prev->ipf_next; |
406 |
((struct ipasfrag *)(prev->ipf_next))->ipf_prev = p;
|
407 |
prev->ipf_next = p; |
408 |
} |
409 |
|
410 |
/*
|
411 |
* To ip_enq as remque is to insque.
|
412 |
*/
|
413 |
static void |
414 |
ip_deq(register struct ipasfrag *p) |
415 |
{ |
416 |
((struct ipasfrag *)(p->ipf_prev))->ipf_next = p->ipf_next;
|
417 |
((struct ipasfrag *)(p->ipf_next))->ipf_prev = p->ipf_prev;
|
418 |
} |
419 |
|
420 |
/*
|
421 |
* IP timer processing;
|
422 |
* if a timer expires on a reassembly
|
423 |
* queue, discard it.
|
424 |
*/
|
425 |
void
|
426 |
ip_slowtimo(Slirp *slirp) |
427 |
{ |
428 |
struct qlink *l;
|
429 |
|
430 |
DEBUG_CALL("ip_slowtimo");
|
431 |
|
432 |
l = slirp->ipq.ip_link.next; |
433 |
|
434 |
if (l == NULL) |
435 |
return;
|
436 |
|
437 |
while (l != &slirp->ipq.ip_link) {
|
438 |
struct ipq *fp = container_of(l, struct ipq, ip_link); |
439 |
l = l->next; |
440 |
if (--fp->ipq_ttl == 0) { |
441 |
ip_freef(slirp, fp); |
442 |
} |
443 |
} |
444 |
} |
445 |
|
446 |
/*
|
447 |
* Do option processing on a datagram,
|
448 |
* possibly discarding it if bad options are encountered,
|
449 |
* or forwarding it if source-routed.
|
450 |
* Returns 1 if packet has been forwarded/freed,
|
451 |
* 0 if the packet should be processed further.
|
452 |
*/
|
453 |
|
454 |
#ifdef notdef
|
455 |
|
456 |
int
|
457 |
ip_dooptions(m) |
458 |
struct mbuf *m;
|
459 |
{ |
460 |
register struct ip *ip = mtod(m, struct ip *); |
461 |
register u_char *cp;
|
462 |
register struct ip_timestamp *ipt; |
463 |
register struct in_ifaddr *ia; |
464 |
int opt, optlen, cnt, off, code, type, forward = 0; |
465 |
struct in_addr *sin, dst;
|
466 |
typedef uint32_t n_time;
|
467 |
n_time ntime; |
468 |
|
469 |
dst = ip->ip_dst; |
470 |
cp = (u_char *)(ip + 1);
|
471 |
cnt = (ip->ip_hl << 2) - sizeof (struct ip); |
472 |
for (; cnt > 0; cnt -= optlen, cp += optlen) { |
473 |
opt = cp[IPOPT_OPTVAL]; |
474 |
if (opt == IPOPT_EOL)
|
475 |
break;
|
476 |
if (opt == IPOPT_NOP)
|
477 |
optlen = 1;
|
478 |
else {
|
479 |
optlen = cp[IPOPT_OLEN]; |
480 |
if (optlen <= 0 || optlen > cnt) { |
481 |
code = &cp[IPOPT_OLEN] - (u_char *)ip; |
482 |
goto bad;
|
483 |
} |
484 |
} |
485 |
switch (opt) {
|
486 |
|
487 |
default:
|
488 |
break;
|
489 |
|
490 |
/*
|
491 |
* Source routing with record.
|
492 |
* Find interface with current destination address.
|
493 |
* If none on this machine then drop if strictly routed,
|
494 |
* or do nothing if loosely routed.
|
495 |
* Record interface address and bring up next address
|
496 |
* component. If strictly routed make sure next
|
497 |
* address is on directly accessible net.
|
498 |
*/
|
499 |
case IPOPT_LSRR:
|
500 |
case IPOPT_SSRR:
|
501 |
if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
|
502 |
code = &cp[IPOPT_OFFSET] - (u_char *)ip; |
503 |
goto bad;
|
504 |
} |
505 |
ipaddr.sin_addr = ip->ip_dst; |
506 |
ia = (struct in_ifaddr *)
|
507 |
ifa_ifwithaddr((struct sockaddr *)&ipaddr);
|
508 |
if (ia == 0) { |
509 |
if (opt == IPOPT_SSRR) {
|
510 |
type = ICMP_UNREACH; |
511 |
code = ICMP_UNREACH_SRCFAIL; |
512 |
goto bad;
|
513 |
} |
514 |
/*
|
515 |
* Loose routing, and not at next destination
|
516 |
* yet; nothing to do except forward.
|
517 |
*/
|
518 |
break;
|
519 |
} |
520 |
off--; /* 0 origin */
|
521 |
if (off > optlen - sizeof(struct in_addr)) { |
522 |
/*
|
523 |
* End of source route. Should be for us.
|
524 |
*/
|
525 |
save_rte(cp, ip->ip_src); |
526 |
break;
|
527 |
} |
528 |
/*
|
529 |
* locate outgoing interface
|
530 |
*/
|
531 |
bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr, |
532 |
sizeof(ipaddr.sin_addr));
|
533 |
if (opt == IPOPT_SSRR) {
|
534 |
#define INA struct in_ifaddr * |
535 |
#define SA struct sockaddr * |
536 |
if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr)) == 0) |
537 |
ia = (INA)ifa_ifwithnet((SA)&ipaddr); |
538 |
} else
|
539 |
ia = ip_rtaddr(ipaddr.sin_addr); |
540 |
if (ia == 0) { |
541 |
type = ICMP_UNREACH; |
542 |
code = ICMP_UNREACH_SRCFAIL; |
543 |
goto bad;
|
544 |
} |
545 |
ip->ip_dst = ipaddr.sin_addr; |
546 |
bcopy((caddr_t)&(IA_SIN(ia)->sin_addr), |
547 |
(caddr_t)(cp + off), sizeof(struct in_addr)); |
548 |
cp[IPOPT_OFFSET] += sizeof(struct in_addr); |
549 |
/*
|
550 |
* Let ip_intr's mcast routing check handle mcast pkts
|
551 |
*/
|
552 |
forward = !IN_MULTICAST(ntohl(ip->ip_dst.s_addr)); |
553 |
break;
|
554 |
|
555 |
case IPOPT_RR:
|
556 |
if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
|
557 |
code = &cp[IPOPT_OFFSET] - (u_char *)ip; |
558 |
goto bad;
|
559 |
} |
560 |
/*
|
561 |
* If no space remains, ignore.
|
562 |
*/
|
563 |
off--; /* 0 origin */
|
564 |
if (off > optlen - sizeof(struct in_addr)) |
565 |
break;
|
566 |
bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr, |
567 |
sizeof(ipaddr.sin_addr));
|
568 |
/*
|
569 |
* locate outgoing interface; if we're the destination,
|
570 |
* use the incoming interface (should be same).
|
571 |
*/
|
572 |
if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 && |
573 |
(ia = ip_rtaddr(ipaddr.sin_addr)) == 0) {
|
574 |
type = ICMP_UNREACH; |
575 |
code = ICMP_UNREACH_HOST; |
576 |
goto bad;
|
577 |
} |
578 |
bcopy((caddr_t)&(IA_SIN(ia)->sin_addr), |
579 |
(caddr_t)(cp + off), sizeof(struct in_addr)); |
580 |
cp[IPOPT_OFFSET] += sizeof(struct in_addr); |
581 |
break;
|
582 |
|
583 |
case IPOPT_TS:
|
584 |
code = cp - (u_char *)ip; |
585 |
ipt = (struct ip_timestamp *)cp;
|
586 |
if (ipt->ipt_len < 5) |
587 |
goto bad;
|
588 |
if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) { |
589 |
if (++ipt->ipt_oflw == 0) |
590 |
goto bad;
|
591 |
break;
|
592 |
} |
593 |
sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1); |
594 |
switch (ipt->ipt_flg) {
|
595 |
|
596 |
case IPOPT_TS_TSONLY:
|
597 |
break;
|
598 |
|
599 |
case IPOPT_TS_TSANDADDR:
|
600 |
if (ipt->ipt_ptr + sizeof(n_time) + |
601 |
sizeof(struct in_addr) > ipt->ipt_len) |
602 |
goto bad;
|
603 |
ipaddr.sin_addr = dst; |
604 |
ia = (INA)ifaof_ i f p foraddr((SA)&ipaddr, |
605 |
m->m_pkthdr.rcvif); |
606 |
if (ia == 0) |
607 |
continue;
|
608 |
bcopy((caddr_t)&IA_SIN(ia)->sin_addr, |
609 |
(caddr_t)sin, sizeof(struct in_addr)); |
610 |
ipt->ipt_ptr += sizeof(struct in_addr); |
611 |
break;
|
612 |
|
613 |
case IPOPT_TS_PRESPEC:
|
614 |
if (ipt->ipt_ptr + sizeof(n_time) + |
615 |
sizeof(struct in_addr) > ipt->ipt_len) |
616 |
goto bad;
|
617 |
bcopy((caddr_t)sin, (caddr_t)&ipaddr.sin_addr, |
618 |
sizeof(struct in_addr)); |
619 |
if (ifa_ifwithaddr((SA)&ipaddr) == 0) |
620 |
continue;
|
621 |
ipt->ipt_ptr += sizeof(struct in_addr); |
622 |
break;
|
623 |
|
624 |
default:
|
625 |
goto bad;
|
626 |
} |
627 |
ntime = iptime(); |
628 |
bcopy((caddr_t)&ntime, (caddr_t)cp + ipt->ipt_ptr - 1,
|
629 |
sizeof(n_time));
|
630 |
ipt->ipt_ptr += sizeof(n_time);
|
631 |
} |
632 |
} |
633 |
if (forward) {
|
634 |
ip_forward(m, 1);
|
635 |
return (1); |
636 |
} |
637 |
return (0); |
638 |
bad:
|
639 |
icmp_error(m, type, code, 0, 0); |
640 |
|
641 |
return (1); |
642 |
} |
643 |
|
644 |
#endif /* notdef */ |
645 |
|
646 |
/*
|
647 |
* Strip out IP options, at higher
|
648 |
* level protocol in the kernel.
|
649 |
* Second argument is buffer to which options
|
650 |
* will be moved, and return value is their length.
|
651 |
* (XXX) should be deleted; last arg currently ignored.
|
652 |
*/
|
653 |
void
|
654 |
ip_stripoptions(register struct mbuf *m, struct mbuf *mopt) |
655 |
{ |
656 |
register int i; |
657 |
struct ip *ip = mtod(m, struct ip *); |
658 |
register caddr_t opts;
|
659 |
int olen;
|
660 |
|
661 |
olen = (ip->ip_hl<<2) - sizeof (struct ip); |
662 |
opts = (caddr_t)(ip + 1);
|
663 |
i = m->m_len - (sizeof (struct ip) + olen); |
664 |
memcpy(opts, opts + olen, (unsigned)i);
|
665 |
m->m_len -= olen; |
666 |
|
667 |
ip->ip_hl = sizeof(struct ip) >> 2; |
668 |
} |