388 lines
9.0 KiB
C
388 lines
9.0 KiB
C
/* $NetBSD: ipcomp_input.c,v 1.7 2000/01/06 15:46:10 itojun Exp $ */
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/*
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* Copyright (C) 1999 WIDE Project.
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* 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 project 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 PROJECT 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 PROJECT 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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/*
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* RFC2393 IP payload compression protocol (IPComp).
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*/
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#include "opt_inet.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/domain.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/syslog.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <net/netisr.h>
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#include <net/zlib.h>
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#include <machine/cpu.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_ecn.h>
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#ifdef INET6
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#include <netinet6/ip6.h>
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#include <netinet6/in6_pcb.h>
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#include <netinet6/ip6_var.h>
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#endif
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#include <netinet6/ipcomp.h>
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#include <netinet6/ipsec.h>
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#include <netkey/key.h>
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#include <netkey/keydb.h>
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#include <netkey/key_debug.h>
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#include <machine/stdarg.h>
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#define IPLEN_FLIPPED
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#ifdef __NetBSD__
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#define ovbcopy bcopy
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#endif
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#ifdef INET
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extern struct protosw inetsw[];
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extern u_char ip_protox[];
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void
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#if __STDC__
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ipcomp4_input(struct mbuf *m, ...)
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#else
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ipcomp4_input(m, va_alist)
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struct mbuf *m;
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va_dcl
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#endif
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{
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struct ip *ip;
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struct ipcomp *ipcomp;
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struct ipcomp_algorithm *algo;
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u_int16_t cpi; /* host order */
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u_int16_t nxt;
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size_t hlen;
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int error;
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size_t newlen, olen;
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struct secas *sa = NULL;
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int off, proto;
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va_list ap;
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va_start(ap, m);
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off = va_arg(ap, int);
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proto = va_arg(ap, int);
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va_end(ap);
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if (off + sizeof(struct ipcomp) > MHLEN) {
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/*XXX the restriction should be relaxed*/
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printf("IPv4 IPComp input: assumption failed (header too long)\n");
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goto fail;
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}
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if (m->m_len < off + sizeof(struct ipcomp)) {
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m = m_pullup(m, off + sizeof(struct ipcomp));
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if (!m) {
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printf("IPv4 IPComp input: can't pullup;"
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"dropping the packet for simplicity\n");
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ipsecstat.in_inval++;
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goto fail;
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}
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} else if (m->m_len > off + sizeof(struct ipcomp)) {
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/* chop header part from the packet header chain */
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struct mbuf *n;
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MGETHDR(n, M_DONTWAIT, MT_HEADER);
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if (!n)
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goto fail;
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M_COPY_PKTHDR(n, m);
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MH_ALIGN(n, off + sizeof(struct ipcomp));
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n->m_len = off + sizeof(struct ipcomp);
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bcopy(mtod(m, caddr_t), mtod(n, caddr_t),
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off + sizeof(struct ipcomp));
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m_adj(m, off + sizeof(struct ipcomp));
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m->m_flags &= ~M_PKTHDR;
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n->m_next = m;
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m = n;
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}
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ip = mtod(m, struct ip *);
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ipcomp = (struct ipcomp *)(((caddr_t)ip) + off);
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nxt = ipcomp->comp_nxt;
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#ifdef _IP_VHL
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hlen = IP_VHL_HL(ip->ip_vhl) << 2;
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#else
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hlen = ip->ip_hl << 2;
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#endif
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cpi = ntohs(ipcomp->comp_cpi);
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if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
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sa = key_allocsa(AF_INET, (caddr_t)&ip->ip_src,
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(caddr_t)&ip->ip_dst, IPPROTO_IPCOMP, htonl(cpi));
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if (sa != NULL
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&& (sa->state == SADB_SASTATE_MATURE
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|| sa->state == SADB_SASTATE_DYING)) {
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cpi = sa->alg_enc; /*XXX*/
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/* other parameters to look at? */
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}
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}
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if (cpi < IPCOMP_MAX && ipcomp_algorithms[cpi].decompress != NULL)
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algo = &ipcomp_algorithms[cpi];
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else
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algo = NULL;
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if (!algo) {
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printf("IPv4 IPComp input: unknown cpi %u; "
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"dropping the packet for simplicity\n", cpi);
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ipsecstat.in_nosa++;
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goto fail;
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}
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/* chop ipcomp header */
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ipcomp = NULL;
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m->m_len -= sizeof(struct ipcomp);
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m->m_pkthdr.len -= sizeof(struct ipcomp);
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#ifdef IPLEN_FLIPPED
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ip->ip_len -= sizeof(struct ipcomp);
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#else
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ip->ip_len = htons(ntohs(ip->ip_len) - sizeof(struct ipcomp));
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#endif
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olen = m->m_pkthdr.len;
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newlen = m->m_pkthdr.len - off;
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error = (*algo->decompress)(m, m->m_next, &newlen);
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if (error != 0) {
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m = NULL;
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goto fail;
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}
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/*
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* returning decompressed packet onto icmp is meaningless.
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* mark it decrypted to prevent icmp from attaching original packet.
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*/
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m->m_flags |= M_DECRYPTED;
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m->m_pkthdr.len = off + newlen;
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ip = mtod(m, struct ip *);
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{
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size_t len;
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#ifdef IPLEN_FLIPPED
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len = ip->ip_len;
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#else
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len = ntohs(ip->ip_len);
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#endif
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/*
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* be careful about underflow. also, do not assign exact value
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* as ip_len is manipulated differently on *BSDs.
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*/
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len += m->m_pkthdr.len;
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len -= olen;
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if (len & ~0xffff) {
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/* packet too big after decompress */
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ipsecstat.in_inval++;
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goto fail;
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}
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#ifdef IPLEN_FLIPPED
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ip->ip_len = len & 0xffff;
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#else
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ip->ip_len = htons(len & 0xffff);
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#endif
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ip->ip_p = nxt;
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}
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if (sa) {
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key_sa_recordxfer(sa, m);
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key_freesa(sa);
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sa = NULL;
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}
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if (nxt != IPPROTO_DONE)
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(*inetsw[ip_protox[nxt]].pr_input)(m, off, nxt);
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else
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m_freem(m);
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m = NULL;
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ipsecstat.in_success++;
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return;
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fail:
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if (sa)
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key_freesa(sa);
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if (m)
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m_freem(m);
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return;
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}
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#endif /* INET */
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#ifdef INET6
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int
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ipcomp6_input(mp, offp, proto)
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struct mbuf **mp;
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int *offp, proto;
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{
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struct mbuf *m, *md;
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int off;
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struct ip6_hdr *ip6;
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struct mbuf *ipcompm;
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struct ipcomp *ipcomp;
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struct ipcomp_algorithm *algo;
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u_int16_t cpi; /* host order */
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u_int16_t nxt;
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int error;
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size_t newlen;
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struct secas *sa = NULL;
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m = *mp;
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off = *offp;
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IP6_EXTHDR_CHECK(m, off, sizeof(struct ipcomp), IPPROTO_DONE);
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{
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int skip;
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struct mbuf *n;
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struct mbuf *p, *q;
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size_t l;
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skip = off;
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for (n = m; n && skip > 0; n = n->m_next) {
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if (n->m_len <= skip) {
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skip -= n->m_len;
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continue;
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}
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break;
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}
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if (!n) {
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printf("IPv6 IPComp input: wrong mbuf chain\n");
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goto fail;
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}
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if (n->m_len < skip + sizeof(struct ipcomp)) {
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printf("IPv6 IPComp input: wrong mbuf chain\n");
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goto fail;
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}
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ip6 = mtod(m, struct ip6_hdr *);
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ipcompm = n;
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ipcomp = (struct ipcomp *)(mtod(n, caddr_t) + skip);
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if (n->m_len > skip + sizeof(struct ipcomp)) {
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/* split mbuf to ease the following steps*/
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l = n->m_len - (skip + sizeof(struct ipcomp));
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p = m_copym(n, skip + sizeof(struct ipcomp), l , M_DONTWAIT);
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if (!p)
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goto fail;
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for (q = p; q && q->m_next; q = q->m_next)
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;
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q->m_next = n->m_next;
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n->m_next = p;
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n->m_len -= l;
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md = p;
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} else
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md = n->m_next;
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}
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nxt = ipcomp->comp_nxt;
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cpi = ntohs(ipcomp->comp_cpi);
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if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
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sa = key_allocsa(AF_INET6, (caddr_t)&ip6->ip6_src,
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(caddr_t)&ip6->ip6_dst, IPPROTO_IPCOMP, htonl(cpi));
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if (sa != NULL
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&& (sa->state == SADB_SASTATE_MATURE
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|| sa->state == SADB_SASTATE_DYING)) {
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cpi = sa->alg_enc; /*XXX*/
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/* other parameters to look at? */
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}
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}
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if (cpi < IPCOMP_MAX && ipcomp_algorithms[cpi].decompress != NULL)
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algo = &ipcomp_algorithms[cpi];
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else
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algo = NULL;
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if (!algo) {
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printf("IPv6 IPComp input: unknown cpi %u; "
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"dropping the packet for simplicity\n", cpi);
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ipsec6stat.in_nosa++;
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goto fail;
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}
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newlen = m->m_pkthdr.len - off - sizeof(struct ipcomp);
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error = (*algo->decompress)(m, md, &newlen);
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if (error != 0) {
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m = NULL;
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goto fail;
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}
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m->m_pkthdr.len = off + sizeof(struct ipcomp) + newlen;
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/*
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* returning decompressed packet onto icmp is meaningless.
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* mark it decrypted to prevent icmp from attaching original packet.
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*/
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m->m_flags |= M_DECRYPTED;
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{
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char *prvnxtp;
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/* chop IPComp header */
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prvnxtp = ip6_get_prevhdr(m, off);
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*prvnxtp = nxt;
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ipcompm->m_len -= sizeof(struct ipcomp);
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ipcompm->m_pkthdr.len -= sizeof(struct ipcomp);
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/* adjust payload length */
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ip6 = mtod(m, struct ip6_hdr *);
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if (((m->m_pkthdr.len - sizeof(struct ip6_hdr)) & ~0xffff) != 0)
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ip6->ip6_plen = 0; /*now a jumbogram*/
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else
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ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
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}
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if (sa) {
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key_sa_recordxfer(sa, m);
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key_freesa(sa);
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sa = NULL;
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}
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*offp = off;
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*mp = m;
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ipsec6stat.in_success++;
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return nxt;
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fail:
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if (m)
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m_freem(m);
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if (sa)
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key_freesa(sa);
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return IPPROTO_DONE;
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}
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#endif /* INET6 */
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