679 lines
17 KiB
C++
679 lines
17 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id$
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/////////////////////////////////////////////////////////////////////////
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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 "ip_icmp.h"
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#if BX_NETWORKING && BX_NETMOD_SLIRP
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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(struct ipasfrag *p,
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struct ipasfrag *prev);
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static void ip_deq(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 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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}
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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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static inline struct ipq *container_of_ip_link(void *ptr)
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{
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return reinterpret_cast<struct ipq*>(static_cast<char*>(ptr) -
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reinterpret_cast<size_t>(&(static_cast<struct ipq*>(0)->ip_link)));
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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 ip_input(struct mbuf *m)
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{
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Slirp *slirp = m->slirp;
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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 < (int)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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}
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hlen = ip->ip_hl << 2;
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if (hlen < (int)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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/* 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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}
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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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* 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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}
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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);
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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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}
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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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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 = (qlink*)slirp->ipq.ip_link.next; l != &slirp->ipq.ip_link;
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l = (qlink*)l->next) {
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fp = container_of_ip_link(l);
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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;
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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);
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} else
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ip->ip_len -= hlen;
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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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}
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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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struct mbuf *m = dtom(slirp, ip);
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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);
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DEBUG_ARG("fp = %lx", (long)fp);
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DEBUG_ARG("m = %lx", (long)m);
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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;
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m->m_len -= hlen;
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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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if (fp == NULL) {
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struct mbuf *t = m_get(slirp);
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if (t == NULL) {
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goto dropfrag;
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}
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fp = mtod(t, struct ipq *);
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insque(&fp->ip_link, &slirp->ipq.ip_link);
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fp->ipq_ttl = IPFRAGTTL;
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fp->ipq_p = ip->ip_p;
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fp->ipq_id = ip->ip_id;
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fp->frag_link.next = fp->frag_link.prev = &fp->frag_link;
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fp->ipq_src = ip->ip_src;
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fp->ipq_dst = ip->ip_dst;
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q = (struct ipasfrag *)fp;
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goto insert;
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}
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/*
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* Find a segment which begins after this one does.
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*/
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for (q = (struct ipasfrag *)fp->frag_link.next; q != (struct ipasfrag *)&fp->frag_link;
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q = (struct ipasfrag *)q->ipf_next)
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if (q->ipf_off > ip->ip_off)
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break;
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/*
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* 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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struct ipasfrag *pq = (struct ipasfrag*)q->ipf_prev;
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i = pq->ipf_off + pq->ipf_len - ip->ip_off;
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if (i > 0) {
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if (i >= ip->ip_len)
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goto dropfrag;
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m_adj(dtom(slirp, ip), i);
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ip->ip_off += i;
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ip->ip_len -= i;
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}
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}
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/*
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* While we overlap succeeding segments trim them or,
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* if they are completely covered, dequeue them.
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*/
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while (q != (struct ipasfrag*)&fp->frag_link &&
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ip->ip_off + ip->ip_len > q->ipf_off) {
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i = (ip->ip_off + ip->ip_len) - q->ipf_off;
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if (i < q->ipf_len) {
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q->ipf_len -= i;
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q->ipf_off += i;
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m_adj(dtom(slirp, q), i);
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break;
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}
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q = (struct ipasfrag*)q->ipf_next;
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m_free(dtom(slirp, q->ipf_prev));
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ip_deq((struct ipasfrag*)q->ipf_prev);
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}
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insert:
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/*
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* Stick new segment in its place;
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* check for complete reassembly.
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*/
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ip_enq(iptofrag(ip), (struct ipasfrag*)q->ipf_prev);
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next = 0;
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for (q = (struct ipasfrag*)fp->frag_link.next; q != (struct ipasfrag*)&fp->frag_link;
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q = (struct ipasfrag*)q->ipf_next) {
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if (q->ipf_off != next)
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return NULL;
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next += q->ipf_len;
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}
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if (((struct ipasfrag *)(q->ipf_prev))->ipf_tos & 1)
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return NULL;
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/*
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* Reassembly is complete; concatenate fragments.
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*/
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q = (struct ipasfrag *)fp->frag_link.next;
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m = dtom(slirp, q);
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q = (struct ipasfrag *) q->ipf_next;
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while (q != (struct ipasfrag*)&fp->frag_link) {
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struct mbuf *t = dtom(slirp, q);
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q = (struct ipasfrag *) q->ipf_next;
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m_cat(m, t);
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}
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/*
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* Create header for new ip packet by
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* modifying header of first packet;
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* dequeue and discard fragment reassembly header.
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* Make header visible.
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*/
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q = (struct ipasfrag *)fp->frag_link.next;
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/*
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* If the fragments concatenated to an mbuf that's
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* bigger than the total size of the fragment, then and
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* m_ext buffer was alloced. But fp->ipq_next points to
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* the old buffer (in the mbuf), so we must point ip
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* into the new buffer.
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*/
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if (m->m_flags & M_EXT) {
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int delta = (char *)q - m->m_dat;
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q = (struct ipasfrag *)(m->m_ext + delta);
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}
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ip = fragtoip(q);
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ip->ip_len = next;
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ip->ip_tos &= ~1;
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ip->ip_src = fp->ipq_src;
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ip->ip_dst = fp->ipq_dst;
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remque(&fp->ip_link);
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(void) m_free(dtom(slirp, fp));
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m->m_len += (ip->ip_hl << 2);
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m->m_data -= (ip->ip_hl << 2);
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return ip;
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dropfrag:
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m_free(m);
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return NULL;
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}
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/*
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* Free a fragment reassembly header and all
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* associated datagrams.
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*/
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static void
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ip_freef(Slirp *slirp, struct ipq *fp)
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{
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struct ipasfrag *q, *p;
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for (q = (struct ipasfrag *)fp->frag_link.next; q != (struct ipasfrag*)&fp->frag_link; q = p) {
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p = (struct ipasfrag *)q->ipf_next;
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ip_deq(q);
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m_free(dtom(slirp, q));
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}
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remque(&fp->ip_link);
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(void) m_free(dtom(slirp, fp));
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}
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/*
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* Put an ip fragment on a reassembly chain.
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* Like insque, but pointers in middle of structure.
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*/
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static void
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ip_enq(struct ipasfrag *p, struct ipasfrag *prev)
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{
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DEBUG_CALL("ip_enq");
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DEBUG_ARG("prev = %lx", (long)prev);
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p->ipf_prev = prev;
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p->ipf_next = prev->ipf_next;
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((struct ipasfrag *)(prev->ipf_next))->ipf_prev = p;
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prev->ipf_next = p;
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}
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/*
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* To ip_enq as remque is to insque.
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*/
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static void
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ip_deq(struct ipasfrag *p)
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{
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((struct ipasfrag *)(p->ipf_prev))->ipf_next = p->ipf_next;
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((struct ipasfrag *)(p->ipf_next))->ipf_prev = p->ipf_prev;
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}
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/*
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* IP timer processing;
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* if a timer expires on a reassembly
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* queue, discard it.
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*/
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void
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ip_slowtimo(Slirp *slirp)
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{
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struct qlink *l;
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DEBUG_CALL("ip_slowtimo");
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l = (struct qlink*)slirp->ipq.ip_link.next;
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if (l == NULL)
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return;
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while (l != &slirp->ipq.ip_link) {
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struct ipq *fp = container_of_ip_link(l);
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l = (struct qlink*)l->next;
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if (--fp->ipq_ttl == 0) {
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ip_freef(slirp, fp);
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}
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}
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}
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/*
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* Do option processing on a datagram,
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* possibly discarding it if bad options are encountered,
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* or forwarding it if source-routed.
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* Returns 1 if packet has been forwarded/freed,
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* 0 if the packet should be processed further.
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*/
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#ifdef notdef
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int
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ip_dooptions(m)
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struct mbuf *m;
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{
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struct ip *ip = mtod(m, struct ip *);
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u_char *cp;
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struct ip_timestamp *ipt;
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struct in_ifaddr *ia;
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int opt, optlen, cnt, off, code, type, forward = 0;
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struct in_addr *sin, dst;
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typedef uint32_t n_time;
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n_time ntime;
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dst = ip->ip_dst;
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cp = (u_char *)(ip + 1);
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cnt = (ip->ip_hl << 2) - sizeof (struct ip);
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for (; cnt > 0; cnt -= optlen, cp += optlen) {
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opt = cp[IPOPT_OPTVAL];
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if (opt == IPOPT_EOL)
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break;
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if (opt == IPOPT_NOP)
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optlen = 1;
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else {
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optlen = cp[IPOPT_OLEN];
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if (optlen <= 0 || optlen > cnt) {
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code = &cp[IPOPT_OLEN] - (u_char *)ip;
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goto bad;
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}
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}
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switch (opt) {
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default:
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break;
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/*
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* Source routing with record.
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* Find interface with current destination address.
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* If none on this machine then drop if strictly routed,
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* or do nothing if loosely routed.
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* Record interface address and bring up next address
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* component. If strictly routed make sure next
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* address is on directly accessible net.
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*/
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case IPOPT_LSRR:
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case IPOPT_SSRR:
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if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
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code = &cp[IPOPT_OFFSET] - (u_char *)ip;
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goto bad;
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}
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ipaddr.sin_addr = ip->ip_dst;
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ia = (struct in_ifaddr *)
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ifa_ifwithaddr((struct sockaddr *)&ipaddr);
|
|
if (ia == 0) {
|
|
if (opt == IPOPT_SSRR) {
|
|
type = ICMP_UNREACH;
|
|
code = ICMP_UNREACH_SRCFAIL;
|
|
goto bad;
|
|
}
|
|
/*
|
|
* Loose routing, and not at next destination
|
|
* yet; nothing to do except forward.
|
|
*/
|
|
break;
|
|
}
|
|
off--; /* 0 origin */
|
|
if (off > optlen - sizeof(struct in_addr)) {
|
|
/*
|
|
* End of source route. Should be for us.
|
|
*/
|
|
save_rte(cp, ip->ip_src);
|
|
break;
|
|
}
|
|
/*
|
|
* locate outgoing interface
|
|
*/
|
|
bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
|
|
sizeof(ipaddr.sin_addr));
|
|
if (opt == IPOPT_SSRR) {
|
|
#define INA struct in_ifaddr *
|
|
#define SA struct sockaddr *
|
|
if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr)) == 0)
|
|
ia = (INA)ifa_ifwithnet((SA)&ipaddr);
|
|
} else
|
|
ia = ip_rtaddr(ipaddr.sin_addr);
|
|
if (ia == 0) {
|
|
type = ICMP_UNREACH;
|
|
code = ICMP_UNREACH_SRCFAIL;
|
|
goto bad;
|
|
}
|
|
ip->ip_dst = ipaddr.sin_addr;
|
|
bcopy((caddr_t)&(IA_SIN(ia)->sin_addr),
|
|
(caddr_t)(cp + off), sizeof(struct in_addr));
|
|
cp[IPOPT_OFFSET] += sizeof(struct in_addr);
|
|
/*
|
|
* Let ip_intr's mcast routing check handle mcast pkts
|
|
*/
|
|
forward = !IN_MULTICAST(ntohl(ip->ip_dst.s_addr));
|
|
break;
|
|
|
|
case IPOPT_RR:
|
|
if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
|
|
code = &cp[IPOPT_OFFSET] - (u_char *)ip;
|
|
goto bad;
|
|
}
|
|
/*
|
|
* If no space remains, ignore.
|
|
*/
|
|
off--; /* 0 origin */
|
|
if (off > optlen - sizeof(struct in_addr))
|
|
break;
|
|
bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
|
|
sizeof(ipaddr.sin_addr));
|
|
/*
|
|
* locate outgoing interface; if we're the destination,
|
|
* use the incoming interface (should be same).
|
|
*/
|
|
if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 &&
|
|
(ia = ip_rtaddr(ipaddr.sin_addr)) == 0) {
|
|
type = ICMP_UNREACH;
|
|
code = ICMP_UNREACH_HOST;
|
|
goto bad;
|
|
}
|
|
bcopy((caddr_t)&(IA_SIN(ia)->sin_addr),
|
|
(caddr_t)(cp + off), sizeof(struct in_addr));
|
|
cp[IPOPT_OFFSET] += sizeof(struct in_addr);
|
|
break;
|
|
|
|
case IPOPT_TS:
|
|
code = cp - (u_char *)ip;
|
|
ipt = (struct ip_timestamp *)cp;
|
|
if (ipt->ipt_len < 5)
|
|
goto bad;
|
|
if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
|
|
if (++ipt->ipt_oflw == 0)
|
|
goto bad;
|
|
break;
|
|
}
|
|
sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1);
|
|
switch (ipt->ipt_flg) {
|
|
|
|
case IPOPT_TS_TSONLY:
|
|
break;
|
|
|
|
case IPOPT_TS_TSANDADDR:
|
|
if (ipt->ipt_ptr + sizeof(n_time) +
|
|
sizeof(struct in_addr) > ipt->ipt_len)
|
|
goto bad;
|
|
ipaddr.sin_addr = dst;
|
|
ia = (INA)ifaof_ i f p foraddr((SA)&ipaddr,
|
|
m->m_pkthdr.rcvif);
|
|
if (ia == 0)
|
|
continue;
|
|
bcopy((caddr_t)&IA_SIN(ia)->sin_addr,
|
|
(caddr_t)sin, sizeof(struct in_addr));
|
|
ipt->ipt_ptr += sizeof(struct in_addr);
|
|
break;
|
|
|
|
case IPOPT_TS_PRESPEC:
|
|
if (ipt->ipt_ptr + sizeof(n_time) +
|
|
sizeof(struct in_addr) > ipt->ipt_len)
|
|
goto bad;
|
|
bcopy((caddr_t)sin, (caddr_t)&ipaddr.sin_addr,
|
|
sizeof(struct in_addr));
|
|
if (ifa_ifwithaddr((SA)&ipaddr) == 0)
|
|
continue;
|
|
ipt->ipt_ptr += sizeof(struct in_addr);
|
|
break;
|
|
|
|
default:
|
|
goto bad;
|
|
}
|
|
ntime = iptime();
|
|
bcopy((caddr_t)&ntime, (caddr_t)cp + ipt->ipt_ptr - 1,
|
|
sizeof(n_time));
|
|
ipt->ipt_ptr += sizeof(n_time);
|
|
}
|
|
}
|
|
if (forward) {
|
|
ip_forward(m, 1);
|
|
return (1);
|
|
}
|
|
return (0);
|
|
bad:
|
|
icmp_error(m, type, code, 0, 0);
|
|
|
|
return (1);
|
|
}
|
|
|
|
#endif /* notdef */
|
|
|
|
/*
|
|
* Strip out IP options, at higher
|
|
* level protocol in the kernel.
|
|
* Second argument is buffer to which options
|
|
* will be moved, and return value is their length.
|
|
* (XXX) should be deleted; last arg currently ignored.
|
|
*/
|
|
void
|
|
ip_stripoptions(struct mbuf *m, struct mbuf *mopt)
|
|
{
|
|
int i;
|
|
struct ip *ip = mtod(m, struct ip *);
|
|
caddr_t opts;
|
|
int olen;
|
|
|
|
olen = (ip->ip_hl<<2) - sizeof (struct ip);
|
|
opts = (caddr_t)(ip + 1);
|
|
i = m->m_len - (sizeof (struct ip) + olen);
|
|
memcpy(opts, opts + olen, (unsigned)i);
|
|
m->m_len -= olen;
|
|
|
|
ip->ip_hl = sizeof(struct ip) >> 2;
|
|
}
|
|
|
|
#endif
|