ip_input.c revision bcacc87b5019dd907592a9025de8c1750269fdb0
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm/*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Copyright (c) 1982, 1986, 1988, 1993
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * The Regents of the University of California. All rights reserved.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm *
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Redistribution and use in source and binary forms, with or without
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * modification, are permitted provided that the following conditions
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * are met:
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * 1. Redistributions of source code must retain the above copyright
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * notice, this list of conditions and the following disclaimer.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * 2. Redistributions in binary form must reproduce the above copyright
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * notice, this list of conditions and the following disclaimer in the
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * documentation and/or other materials provided with the distribution.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * 3. All advertising materials mentioning features or use of this software
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * must display the following acknowledgement:
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * This product includes software developed by the University of
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * California, Berkeley and its contributors.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * 4. Neither the name of the University nor the names of its contributors
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * may be used to endorse or promote products derived from this software
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * without specific prior written permission.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm *
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
f317a3a3712d9b82387b437ac621db3733d8c804krishna * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * SUCH DAMAGE.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm *
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * ip_input.c,v 1.11 1994/11/16 10:17:08 jkh Exp
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm/*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Changes and additions relating to SLiRP are
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Copyright (c) 1995 Danny Gasparovski.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm *
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Please read the file COPYRIGHT for the
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * terms and conditions of the copyright.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm#include <slirp.h>
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm#include "ip_icmp.h"
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm/*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * IP initialization: fill in IP protocol switch table.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * All protocols not implemented in kernel go to raw IP protocol handler.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gmvoid
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gmip_init(PNATState pData)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm{
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm int i = 0;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm for (i = 0; i < IPREASS_NHASH; ++i)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm TAILQ_INIT(&ipq[i]);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm maxnipq = 100; /* ??? */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm maxfragsperpacket = 16;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm nipq = 0;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip_currid = tt.tv_sec & 0xffff;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm udp_init(pData);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm tcp_init(pData);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm}
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm/*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Ip input routine. Checksum and byte swap header. If fragmented
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * try to reassemble. Process options. Pass to next level.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gmvoid
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gmip_input(PNATState pData, struct mbuf *m)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm{
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm register struct ip *ip;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm int hlen;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm DEBUG_CALL("ip_input");
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm DEBUG_ARG("m = %lx", (long)m);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm DEBUG_ARG("m_len = %d", m->m_len);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ipstat.ips_total++;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (m->m_len < sizeof(struct ip))
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ipstat.ips_toosmall++;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm return;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip = mtod(m, struct ip *);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (ip->ip_v != IPVERSION)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ipstat.ips_badvers++;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm goto bad;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm hlen = ip->ip_hl << 2;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if ( hlen < sizeof(struct ip)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm || hlen > m->m_len)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /* min header length */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ipstat.ips_badhlen++; /* or packet too short */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm goto bad;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /* keep ip header intact for ICMP reply
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * ip->ip_sum = cksum(m, hlen);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * if (ip->ip_sum) {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (cksum(m, hlen))
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ipstat.ips_badsum++;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm goto bad;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Convert fields to host representation.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm NTOHS(ip->ip_len);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (ip->ip_len < hlen)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ipstat.ips_badlen++;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm goto bad;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm NTOHS(ip->ip_id);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm NTOHS(ip->ip_off);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Check that the amount of data in the buffers
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * is as at least much as the IP header would have us expect.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Trim mbufs if longer than we expect.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Drop packet if shorter than we expect.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (m->m_len < ip->ip_len)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ipstat.ips_tooshort++;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm goto bad;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /* Should drop packet if mbuf too long? hmmm... */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (m->m_len > ip->ip_len)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m_adj(m, ip->ip_len - m->m_len);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /* check ip_ttl for a correct ICMP reply */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (ip->ip_ttl==0 || ip->ip_ttl == 1)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm icmp_error(pData, m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, 0, "ttl");
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm goto bad;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip->ip_ttl--;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * If offset or IP_MF are set, must reassemble.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Otherwise, nothing need be done.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * (We could look in the reassembly queue to see
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * if the packet was previously fragmented,
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * but it's not worth the time; just let them time out.)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm *
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * XXX This should fail, don't fragment yet
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (ip->ip_off & (IP_MF | IP_OFFMASK))
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m = ip_reass(pData, m);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (m == NULL)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm return;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip = mtod(m, struct ip *);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm hlen = ip->ip_len;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm else
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip->ip_len -= hlen;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Switch out to protocol's input routine.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ipstat.ips_delivered++;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm switch (ip->ip_p)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm case IPPROTO_TCP:
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm tcp_input(pData, m, hlen, (struct socket *)NULL);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm break;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm case IPPROTO_UDP:
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm udp_input(pData, m, hlen);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm break;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm case IPPROTO_ICMP:
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm icmp_input(pData, m, hlen);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm break;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm default:
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ipstat.ips_noproto++;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m_free(pData, m);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm return;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gmbad:
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m_freem(pData, m);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm return;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm}
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gmstruct mbuf *
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gmip_reass(PNATState pData, struct mbuf* m)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm{
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm struct ip *ip;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm struct mbuf *p, *q, *nq;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm struct ipq_t *fp = NULL;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm struct ipqhead *head;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm int i, hlen, next;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm u_short hash;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /* If maxnipq or maxfragsperpacket are 0, never accept fragments. */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if ( maxnipq == 0
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm || maxfragsperpacket == 0)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ipstat.ips_fragments++;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ipstat.ips_fragdropped++;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m_freem(pData, m);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm return (NULL);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip = mtod(m, struct ip *);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm hlen = ip->ip_hl << 2;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm hash = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm head = &ipq[hash];
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Look for queue of fragments
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * of this datagram.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm TAILQ_FOREACH(fp, head, ipq_list)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (ip->ip_id == fp->ipq_id &&
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip->ip_src.s_addr == fp->ipq_src.s_addr &&
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip->ip_dst.s_addr == fp->ipq_dst.s_addr &&
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip->ip_p == fp->ipq_p)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm goto found;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm fp = NULL;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Attempt to trim the number of allocated fragment queues if it
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * exceeds the administrative limit.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if ((nipq > maxnipq) && (maxnipq > 0))
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * drop something from the tail of the current queue
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * before proceeding further
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm struct ipq_t *q = TAILQ_LAST(head, ipqhead);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (q == NULL)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /* gak */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm for (i = 0; i < IPREASS_NHASH; i++)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm struct ipq_t *r = TAILQ_LAST(&ipq[i], ipqhead);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (r)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ipstat.ips_fragtimeout += r->ipq_nfrags;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip_freef(pData, &ipq[i], r);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm break;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm else
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ipstat.ips_fragtimeout += q->ipq_nfrags;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip_freef(pData, head, q);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gmfound:
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Adjust ip_len to not reflect header,
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * convert offset of this to bytes.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip->ip_len -= hlen;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (ip->ip_off & IP_MF)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Make sure that fragments have a data length
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * that's a non-zero multiple of 8 bytes.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ipstat.ips_toosmall++; /* XXX */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm goto dropfrag;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m->m_flags |= M_FRAG;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm else
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m->m_flags &= ~M_FRAG;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip->ip_off <<= 3;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Attempt reassembly; if it succeeds, proceed.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * ip_reass() will return a different mbuf.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ipstat.ips_fragments++;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m->m_hdr.header = ip;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /* Previous ip_reass() started here. */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Presence of header sizes in mbufs
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * would confuse code below.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m->m_data += hlen;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m->m_len -= hlen;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * If first fragment to arrive, create a reassembly queue.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (fp == NULL)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm fp = RTMemAlloc(sizeof(struct ipq_t));
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (fp == NULL)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm goto dropfrag;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm TAILQ_INSERT_HEAD(head, fp, ipq_list);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm nipq++;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm fp->ipq_nfrags = 1;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm fp->ipq_ttl = IPFRAGTTL;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm fp->ipq_p = ip->ip_p;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm fp->ipq_id = ip->ip_id;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm fp->ipq_src = ip->ip_src;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm fp->ipq_dst = ip->ip_dst;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm fp->ipq_frags = m;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m->m_nextpkt = NULL;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm goto done;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm else
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm fp->ipq_nfrags++;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm#define GETIP(m) ((struct ip*)((m)->m_hdr.header))
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Find a segment which begins after this one does.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm for (p = NULL, q = fp->ipq_frags; q; p = q, q = q->m_nextpkt)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (GETIP(q)->ip_off > ip->ip_off)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm break;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * If there is a preceding segment, it may provide some of
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * our data already. If so, drop the data from the incoming
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * segment. If it provides all of our data, drop us, otherwise
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * stick new segment in the proper place.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm *
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * If some of the data is dropped from the the preceding
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * segment, then it's checksum is invalidated.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (p)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm i = GETIP(p)->ip_off + GETIP(p)->ip_len - ip->ip_off;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (i > 0)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (i >= ip->ip_len)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm goto dropfrag;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m_adj(m, i);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip->ip_off += i;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip->ip_len -= i;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m->m_nextpkt = p->m_nextpkt;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm p->m_nextpkt = m;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm else
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m->m_nextpkt = fp->ipq_frags;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm fp->ipq_frags = m;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * While we overlap succeeding segments trim them or,
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * if they are completely covered, dequeue them.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm for (; q != NULL && ip->ip_off + ip->ip_len > GETIP(q)->ip_off;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm q = nq)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm i = (ip->ip_off + ip->ip_len) - GETIP(q)->ip_off;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (i < GETIP(q)->ip_len)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm GETIP(q)->ip_len -= i;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm GETIP(q)->ip_off += i;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m_adj(q, i);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm break;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm nq = q->m_nextpkt;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m->m_nextpkt = nq;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ipstat.ips_fragdropped++;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm fp->ipq_nfrags--;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m_freem(pData, q);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Check for complete reassembly and perform frag per packet
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * limiting.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm *
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Frag limiting is performed here so that the nth frag has
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * a chance to complete the packet before we drop the packet.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * As a result, n+1 frags are actually allowed per packet, but
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * only n will ever be stored. (n = maxfragsperpacket.)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm *
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm next = 0;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm for (p = NULL, q = fp->ipq_frags; q; p = q, q = q->m_nextpkt)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (GETIP(q)->ip_off != next)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (fp->ipq_nfrags > maxfragsperpacket)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ipstat.ips_fragdropped += fp->ipq_nfrags;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip_freef(pData, head, fp);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm goto done;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm next += GETIP(q)->ip_len;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /* Make sure the last packet didn't have the IP_MF flag */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (p->m_flags & M_FRAG)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (fp->ipq_nfrags > maxfragsperpacket)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ipstat.ips_fragdropped += fp->ipq_nfrags;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip_freef(pData, head, fp);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm goto done;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Reassembly is complete. Make sure the packet is a sane size.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm q = fp->ipq_frags;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip = GETIP(q);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (next + (ip->ip_hl << 2) > IP_MAXPACKET)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ipstat.ips_fragdropped += fp->ipq_nfrags;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip_freef(pData, head, fp);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm goto done;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Concatenate fragments.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m = q;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm nq = q->m_nextpkt;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm q->m_nextpkt = NULL;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm for (q = nq; q != NULL; q = nq)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm nq = q->m_nextpkt;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm q->m_nextpkt = NULL;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m_cat(pData, m, q);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Create header for new ip packet by modifying header of first
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * packet; dequeue and discard fragment reassembly header.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Make header visible.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm#if 0
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip->ip_len = (ip->ip_hl << 2) + next;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm#else
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip->ip_len = next;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm#endif
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip->ip_src = fp->ipq_src;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip->ip_dst = fp->ipq_dst;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm TAILQ_REMOVE(head, fp, ipq_list);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm nipq--;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm RTMemFree(fp);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m->m_len += (ip->ip_hl << 2);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m->m_data -= (ip->ip_hl << 2);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /* some debugging cruft by sklower, below, will go away soon */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm#if 0
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (m->m_flags & M_PKTHDR) /* XXX this should be done elsewhere */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m_fixhdr(m);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm#endif
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ipstat.ips_reassembled++;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm return (m);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gmdropfrag:
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ipstat.ips_fragdropped++;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (fp != NULL)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm fp->ipq_nfrags--;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m_freem(pData, m);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gmdone:
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm return NULL;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm#undef GETIP
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm}
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gmvoid
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gmip_freef(PNATState pData, struct ipqhead *fhp, struct ipq_t *fp)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm{
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm struct mbuf *q;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm while (fp->ipq_frags)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm q = fp->ipq_frags;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm fp->ipq_frags = q->m_nextpkt;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m_freem(pData, q);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm TAILQ_REMOVE(fhp, fp, ipq_list);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm RTMemFree(fp);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm nipq--;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm}
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm/*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * IP timer processing;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * if a timer expires on a reassembly
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * queue, discard it.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gmvoid
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gmip_slowtimo(PNATState pData)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm{
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm register struct ipq_t *fp;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /* XXX: the fragment expiration is the same but requier
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * additional loop see (see ip_input.c in FreeBSD tree)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm int i;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm DEBUG_CALL("ip_slowtimo");
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm for (i = 0; i < IPREASS_NHASH; i++)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm for(fp = TAILQ_FIRST(&ipq[i]); fp;)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm struct ipq_t *fpp;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm fpp = fp;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm fp = TAILQ_NEXT(fp, ipq_list);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if(--fpp->ipq_ttl == 0)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ipstat.ips_fragtimeout += fpp->ipq_nfrags;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip_freef(pData, &ipq[i], fpp);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm /*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * If we are over the maximum number of fragments
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * (due to the limit being lowered), drain off
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * enough to get down to the new limit.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm if (maxnipq >= 0 && nipq > maxnipq)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm for (i = 0; i < IPREASS_NHASH; i++)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm while (nipq > maxnipq && !TAILQ_EMPTY(&ipq[i]))
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm {
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ipstat.ips_fragdropped += TAILQ_FIRST(&ipq[i])->ipq_nfrags;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip_freef(pData, &ipq[i], TAILQ_FIRST(&ipq[i]));
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm }
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm}
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm/*
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Strip out IP options, at higher
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * level protocol in the kernel.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * Second argument is buffer to which options
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * will be moved, and return value is their length.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm * (XXX) should be deleted; last arg currently ignored.
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm */
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gmvoid
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gmip_stripoptions(struct mbuf *m, struct mbuf *mopt)
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm{
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm register int i;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm struct ip *ip = mtod(m, struct ip *);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm register caddr_t opts;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm int olen;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm olen = (ip->ip_hl<<2) - sizeof(struct ip);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm opts = (caddr_t)(ip + 1);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm i = m->m_len - (sizeof(struct ip) + olen);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm memcpy(opts, opts + olen, (unsigned)i);
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm m->m_len -= olen;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm ip->ip_hl = sizeof(struct ip) >> 2;
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm}
88f8b78a88cbdc6d8c1af5c3e54bc49d25095c98gm