5bb84bc84b
- Prefer '_' to ' ', as it results in more easily parsed results in memory monitoring tools such as vmstat. - Remove punctuation that is incompatible with using memory type names as file names, such as '/' characters. - Disambiguate some collisions by adding subsystem prefixes to some memory types. - Generally prefer lower case to upper case. - If the same type is defined in multiple architecture directories, attempt to use the same name in additional cases. Not all instances were caught in this change, so more work is required to finish this conversion. Similar changes are required for UMA zone names.
483 lines
12 KiB
C
483 lines
12 KiB
C
/* $FreeBSD$ */
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/* $KAME: ip_encap.c,v 1.41 2001/03/15 08:35:08 itojun Exp $ */
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/*-
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* Copyright (C) 1995, 1996, 1997, and 1998 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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* My grandfather said that there's a devil inside tunnelling technology...
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*
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* We have surprisingly many protocols that want packets with IP protocol
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* #4 or #41. Here's a list of protocols that want protocol #41:
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* RFC1933 configured tunnel
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* RFC1933 automatic tunnel
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* RFC2401 IPsec tunnel
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* RFC2473 IPv6 generic packet tunnelling
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* RFC2529 6over4 tunnel
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* mobile-ip6 (uses RFC2473)
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* RFC3056 6to4 tunnel
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* isatap tunnel
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* Here's a list of protocol that want protocol #4:
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* RFC1853 IPv4-in-IPv4 tunnelling
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* RFC2003 IPv4 encapsulation within IPv4
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* RFC2344 reverse tunnelling for mobile-ip4
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* RFC2401 IPsec tunnel
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* Well, what can I say. They impose different en/decapsulation mechanism
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* from each other, so they need separate protocol handler. The only one
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* we can easily determine by protocol # is IPsec, which always has
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* AH/ESP/IPComp header right after outer IP header.
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*
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* So, clearly good old protosw does not work for protocol #4 and #41.
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* The code will let you match protocol via src/dst address pair.
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*/
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/* XXX is M_NETADDR correct? */
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#include "opt_mrouting.h"
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/mbuf.h>
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#include <sys/errno.h>
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#include <sys/protosw.h>
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#include <sys/queue.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.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_encap.h>
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#ifdef INET6
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/ip6protosw.h>
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#endif
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#include <machine/stdarg.h>
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#include <net/net_osdep.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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static MALLOC_DEFINE(M_NETADDR, "encap_export_host", "Export host address structure");
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static void encap_add(struct encaptab *);
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static int mask_match(const struct encaptab *, const struct sockaddr *,
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const struct sockaddr *);
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static void encap_fillarg(struct mbuf *, const struct encaptab *);
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/*
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* All global variables in ip_encap.c are locked using encapmtx.
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*/
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static struct mtx encapmtx;
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MTX_SYSINIT(encapmtx, &encapmtx, "encapmtx", MTX_DEF);
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LIST_HEAD(, encaptab) encaptab = LIST_HEAD_INITIALIZER(&encaptab);
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/*
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* We currently keey encap_init() for source code compatibility reasons --
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* it's referenced by KAME pieces in netinet6.
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*/
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void
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encap_init()
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{
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}
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#ifdef INET
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void
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encap4_input(m, off)
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struct mbuf *m;
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int off;
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{
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struct ip *ip;
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int proto;
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struct sockaddr_in s, d;
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const struct protosw *psw;
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struct encaptab *ep, *match;
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int prio, matchprio;
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ip = mtod(m, struct ip *);
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proto = ip->ip_p;
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bzero(&s, sizeof(s));
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s.sin_family = AF_INET;
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s.sin_len = sizeof(struct sockaddr_in);
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s.sin_addr = ip->ip_src;
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bzero(&d, sizeof(d));
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d.sin_family = AF_INET;
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d.sin_len = sizeof(struct sockaddr_in);
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d.sin_addr = ip->ip_dst;
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match = NULL;
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matchprio = 0;
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mtx_lock(&encapmtx);
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LIST_FOREACH(ep, &encaptab, chain) {
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if (ep->af != AF_INET)
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continue;
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if (ep->proto >= 0 && ep->proto != proto)
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continue;
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if (ep->func)
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prio = (*ep->func)(m, off, proto, ep->arg);
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else {
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/*
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* it's inbound traffic, we need to match in reverse
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* order
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*/
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prio = mask_match(ep, (struct sockaddr *)&d,
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(struct sockaddr *)&s);
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}
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/*
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* We prioritize the matches by using bit length of the
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* matches. mask_match() and user-supplied matching function
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* should return the bit length of the matches (for example,
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* if both src/dst are matched for IPv4, 64 should be returned).
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* 0 or negative return value means "it did not match".
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*
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* The question is, since we have two "mask" portion, we
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* cannot really define total order between entries.
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* For example, which of these should be preferred?
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* mask_match() returns 48 (32 + 16) for both of them.
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* src=3ffe::/16, dst=3ffe:501::/32
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* src=3ffe:501::/32, dst=3ffe::/16
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*
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* We need to loop through all the possible candidates
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* to get the best match - the search takes O(n) for
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* n attachments (i.e. interfaces).
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*/
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if (prio <= 0)
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continue;
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if (prio > matchprio) {
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matchprio = prio;
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match = ep;
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}
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}
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mtx_unlock(&encapmtx);
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if (match) {
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/* found a match, "match" has the best one */
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psw = match->psw;
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if (psw && psw->pr_input) {
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encap_fillarg(m, match);
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(*psw->pr_input)(m, off);
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} else
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m_freem(m);
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return;
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}
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/* last resort: inject to raw socket */
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rip_input(m, off);
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}
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#endif
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#ifdef INET6
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int
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encap6_input(mp, offp, proto)
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struct mbuf **mp;
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int *offp;
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int proto;
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{
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struct mbuf *m = *mp;
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struct ip6_hdr *ip6;
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struct sockaddr_in6 s, d;
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const struct ip6protosw *psw;
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struct encaptab *ep, *match;
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int prio, matchprio;
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ip6 = mtod(m, struct ip6_hdr *);
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bzero(&s, sizeof(s));
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s.sin6_family = AF_INET6;
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s.sin6_len = sizeof(struct sockaddr_in6);
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s.sin6_addr = ip6->ip6_src;
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bzero(&d, sizeof(d));
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d.sin6_family = AF_INET6;
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d.sin6_len = sizeof(struct sockaddr_in6);
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d.sin6_addr = ip6->ip6_dst;
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match = NULL;
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matchprio = 0;
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mtx_lock(&encapmtx);
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LIST_FOREACH(ep, &encaptab, chain) {
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if (ep->af != AF_INET6)
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continue;
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if (ep->proto >= 0 && ep->proto != proto)
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continue;
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if (ep->func)
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prio = (*ep->func)(m, *offp, proto, ep->arg);
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else {
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/*
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* it's inbound traffic, we need to match in reverse
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* order
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*/
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prio = mask_match(ep, (struct sockaddr *)&d,
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(struct sockaddr *)&s);
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}
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/* see encap4_input() for issues here */
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if (prio <= 0)
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continue;
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if (prio > matchprio) {
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matchprio = prio;
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match = ep;
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}
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}
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mtx_unlock(&encapmtx);
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if (match) {
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/* found a match */
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psw = (const struct ip6protosw *)match->psw;
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if (psw && psw->pr_input) {
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encap_fillarg(m, match);
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return (*psw->pr_input)(mp, offp, proto);
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} else {
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m_freem(m);
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return IPPROTO_DONE;
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}
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}
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/* last resort: inject to raw socket */
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return rip6_input(mp, offp, proto);
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}
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#endif
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/*lint -sem(encap_add, custodial(1)) */
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static void
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encap_add(ep)
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struct encaptab *ep;
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{
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mtx_assert(&encapmtx, MA_OWNED);
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LIST_INSERT_HEAD(&encaptab, ep, chain);
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}
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/*
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* sp (src ptr) is always my side, and dp (dst ptr) is always remote side.
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* length of mask (sm and dm) is assumed to be same as sp/dp.
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* Return value will be necessary as input (cookie) for encap_detach().
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*/
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const struct encaptab *
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encap_attach(af, proto, sp, sm, dp, dm, psw, arg)
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int af;
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int proto;
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const struct sockaddr *sp, *sm;
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const struct sockaddr *dp, *dm;
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const struct protosw *psw;
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void *arg;
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{
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struct encaptab *ep;
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/* sanity check on args */
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if (sp->sa_len > sizeof(ep->src) || dp->sa_len > sizeof(ep->dst))
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return (NULL);
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if (sp->sa_len != dp->sa_len)
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return (NULL);
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if (af != sp->sa_family || af != dp->sa_family)
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return (NULL);
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/* check if anyone have already attached with exactly same config */
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mtx_lock(&encapmtx);
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LIST_FOREACH(ep, &encaptab, chain) {
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if (ep->af != af)
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continue;
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if (ep->proto != proto)
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continue;
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if (ep->src.ss_len != sp->sa_len ||
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bcmp(&ep->src, sp, sp->sa_len) != 0 ||
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bcmp(&ep->srcmask, sm, sp->sa_len) != 0)
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continue;
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if (ep->dst.ss_len != dp->sa_len ||
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bcmp(&ep->dst, dp, dp->sa_len) != 0 ||
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bcmp(&ep->dstmask, dm, dp->sa_len) != 0)
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continue;
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mtx_unlock(&encapmtx);
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return (NULL);
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}
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ep = malloc(sizeof(*ep), M_NETADDR, M_NOWAIT); /*XXX*/
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if (ep == NULL) {
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mtx_unlock(&encapmtx);
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return (NULL);
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}
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bzero(ep, sizeof(*ep));
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ep->af = af;
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ep->proto = proto;
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bcopy(sp, &ep->src, sp->sa_len);
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bcopy(sm, &ep->srcmask, sp->sa_len);
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bcopy(dp, &ep->dst, dp->sa_len);
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bcopy(dm, &ep->dstmask, dp->sa_len);
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ep->psw = psw;
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ep->arg = arg;
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encap_add(ep);
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mtx_unlock(&encapmtx);
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return (ep);
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}
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const struct encaptab *
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encap_attach_func(af, proto, func, psw, arg)
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int af;
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int proto;
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int (*func)(const struct mbuf *, int, int, void *);
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const struct protosw *psw;
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void *arg;
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{
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struct encaptab *ep;
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/* sanity check on args */
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if (!func)
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return (NULL);
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ep = malloc(sizeof(*ep), M_NETADDR, M_NOWAIT); /*XXX*/
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if (ep == NULL)
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return (NULL);
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bzero(ep, sizeof(*ep));
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ep->af = af;
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ep->proto = proto;
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ep->func = func;
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ep->psw = psw;
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ep->arg = arg;
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mtx_lock(&encapmtx);
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encap_add(ep);
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mtx_unlock(&encapmtx);
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return (ep);
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}
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int
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encap_detach(cookie)
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const struct encaptab *cookie;
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{
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const struct encaptab *ep = cookie;
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struct encaptab *p;
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mtx_lock(&encapmtx);
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LIST_FOREACH(p, &encaptab, chain) {
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if (p == ep) {
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LIST_REMOVE(p, chain);
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mtx_unlock(&encapmtx);
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free(p, M_NETADDR); /*XXX*/
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return 0;
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}
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}
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mtx_unlock(&encapmtx);
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return EINVAL;
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}
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static int
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mask_match(ep, sp, dp)
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const struct encaptab *ep;
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const struct sockaddr *sp;
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const struct sockaddr *dp;
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{
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struct sockaddr_storage s;
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struct sockaddr_storage d;
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int i;
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const u_int8_t *p, *q;
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u_int8_t *r;
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int matchlen;
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if (sp->sa_len > sizeof(s) || dp->sa_len > sizeof(d))
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return 0;
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if (sp->sa_family != ep->af || dp->sa_family != ep->af)
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return 0;
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if (sp->sa_len != ep->src.ss_len || dp->sa_len != ep->dst.ss_len)
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return 0;
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matchlen = 0;
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p = (const u_int8_t *)sp;
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q = (const u_int8_t *)&ep->srcmask;
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r = (u_int8_t *)&s;
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for (i = 0 ; i < sp->sa_len; i++) {
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r[i] = p[i] & q[i];
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/* XXX estimate */
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matchlen += (q[i] ? 8 : 0);
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}
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p = (const u_int8_t *)dp;
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q = (const u_int8_t *)&ep->dstmask;
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r = (u_int8_t *)&d;
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for (i = 0 ; i < dp->sa_len; i++) {
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r[i] = p[i] & q[i];
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/* XXX rough estimate */
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matchlen += (q[i] ? 8 : 0);
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}
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/* need to overwrite len/family portion as we don't compare them */
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s.ss_len = sp->sa_len;
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s.ss_family = sp->sa_family;
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d.ss_len = dp->sa_len;
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d.ss_family = dp->sa_family;
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if (bcmp(&s, &ep->src, ep->src.ss_len) == 0 &&
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bcmp(&d, &ep->dst, ep->dst.ss_len) == 0) {
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return matchlen;
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} else
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return 0;
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}
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static void
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encap_fillarg(m, ep)
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struct mbuf *m;
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const struct encaptab *ep;
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{
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struct m_tag *tag;
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tag = m_tag_get(PACKET_TAG_ENCAP, sizeof (void*), M_NOWAIT);
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if (tag) {
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*(void**)(tag+1) = ep->arg;
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m_tag_prepend(m, tag);
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}
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}
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void *
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encap_getarg(m)
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struct mbuf *m;
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{
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void *p = NULL;
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struct m_tag *tag;
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tag = m_tag_find(m, PACKET_TAG_ENCAP, NULL);
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if (tag) {
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p = *(void**)(tag+1);
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m_tag_delete(m, tag);
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}
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return p;
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}
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