ip_encap.c revision 78064
162587Sitojun/* $FreeBSD: head/sys/netinet/ip_encap.c 78064 2001-06-11 12:39:29Z ume $ */ 278064Sume/* $KAME: ip_encap.c,v 1.41 2001/03/15 08:35:08 itojun Exp $ */ 362587Sitojun 462587Sitojun/* 562587Sitojun * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 662587Sitojun * All rights reserved. 762587Sitojun * 862587Sitojun * Redistribution and use in source and binary forms, with or without 962587Sitojun * modification, are permitted provided that the following conditions 1062587Sitojun * are met: 1162587Sitojun * 1. Redistributions of source code must retain the above copyright 1262587Sitojun * notice, this list of conditions and the following disclaimer. 1362587Sitojun * 2. Redistributions in binary form must reproduce the above copyright 1462587Sitojun * notice, this list of conditions and the following disclaimer in the 1562587Sitojun * documentation and/or other materials provided with the distribution. 1662587Sitojun * 3. Neither the name of the project nor the names of its contributors 1762587Sitojun * may be used to endorse or promote products derived from this software 1862587Sitojun * without specific prior written permission. 1962587Sitojun * 2062587Sitojun * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 2162587Sitojun * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2262587Sitojun * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2362587Sitojun * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2462587Sitojun * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2562587Sitojun * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2662587Sitojun * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2762587Sitojun * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2862587Sitojun * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2962587Sitojun * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3062587Sitojun * SUCH DAMAGE. 3162587Sitojun */ 3262587Sitojun/* 3362587Sitojun * My grandfather said that there's a devil inside tunnelling technology... 3462587Sitojun * 3562587Sitojun * We have surprisingly many protocols that want packets with IP protocol 3662587Sitojun * #4 or #41. Here's a list of protocols that want protocol #41: 3762587Sitojun * RFC1933 configured tunnel 3862587Sitojun * RFC1933 automatic tunnel 3962587Sitojun * RFC2401 IPsec tunnel 4062587Sitojun * RFC2473 IPv6 generic packet tunnelling 4162587Sitojun * RFC2529 6over4 tunnel 4262587Sitojun * mobile-ip6 (uses RFC2473) 4362587Sitojun * 6to4 tunnel 4462587Sitojun * Here's a list of protocol that want protocol #4: 4562587Sitojun * RFC1853 IPv4-in-IPv4 tunnelling 4662587Sitojun * RFC2003 IPv4 encapsulation within IPv4 4762587Sitojun * RFC2344 reverse tunnelling for mobile-ip4 4862587Sitojun * RFC2401 IPsec tunnel 4962587Sitojun * Well, what can I say. They impose different en/decapsulation mechanism 5062587Sitojun * from each other, so they need separate protocol handler. The only one 5162587Sitojun * we can easily determine by protocol # is IPsec, which always has 5262587Sitojun * AH/ESP/IPComp header right after outer IP header. 5362587Sitojun * 5462587Sitojun * So, clearly good old protosw does not work for protocol #4 and #41. 5562587Sitojun * The code will let you match protocol via src/dst address pair. 5662587Sitojun */ 5762587Sitojun/* XXX is M_NETADDR correct? */ 5862587Sitojun 5962587Sitojun#include "opt_mrouting.h" 6062587Sitojun#include "opt_inet.h" 6162587Sitojun#include "opt_inet6.h" 6262587Sitojun 6362587Sitojun#include <sys/param.h> 6462587Sitojun#include <sys/systm.h> 6562587Sitojun#include <sys/socket.h> 6662587Sitojun#include <sys/sockio.h> 6762587Sitojun#include <sys/mbuf.h> 6862587Sitojun#include <sys/errno.h> 6962587Sitojun#include <sys/protosw.h> 7078064Sume#include <sys/queue.h> 7162587Sitojun 7262587Sitojun#include <net/if.h> 7362587Sitojun#include <net/route.h> 7462587Sitojun 7562587Sitojun#include <netinet/in.h> 7662587Sitojun#include <netinet/in_systm.h> 7762587Sitojun#include <netinet/ip.h> 7862587Sitojun#include <netinet/ip_var.h> 7962587Sitojun#include <netinet/ip_encap.h> 8062587Sitojun#ifdef MROUTING 8162587Sitojun#include <netinet/ip_mroute.h> 8262587Sitojun#endif /* MROUTING */ 8362587Sitojun#include <netinet/ipprotosw.h> 8462587Sitojun 8562587Sitojun#ifdef INET6 8662587Sitojun#include <netinet/ip6.h> 8762587Sitojun#include <netinet6/ip6_var.h> 8862587Sitojun#include <netinet6/ip6protosw.h> 8962587Sitojun#endif 9062587Sitojun 9162587Sitojun#include <machine/stdarg.h> 9262587Sitojun 9362587Sitojun#include <net/net_osdep.h> 9462587Sitojun 9562587Sitojun#include <sys/kernel.h> 9662587Sitojun#include <sys/malloc.h> 9769774Sphkstatic MALLOC_DEFINE(M_NETADDR, "Export Host", "Export host address structure"); 9862587Sitojun 9962587Sitojunstatic void encap_add __P((struct encaptab *)); 10062587Sitojunstatic int mask_match __P((const struct encaptab *, const struct sockaddr *, 10162587Sitojun const struct sockaddr *)); 10262587Sitojunstatic void encap_fillarg __P((struct mbuf *, const struct encaptab *)); 10362587Sitojun 10478064Sume#ifndef LIST_HEAD_INITIALIZER 10562587Sitojun/* rely upon BSS initialization */ 10662587SitojunLIST_HEAD(, encaptab) encaptab; 10778064Sume#else 10878064SumeLIST_HEAD(, encaptab) encaptab = LIST_HEAD_INITIALIZER(&encaptab); 10978064Sume#endif 11062587Sitojun 11162587Sitojunvoid 11262587Sitojunencap_init() 11362587Sitojun{ 11478064Sume static int initialized = 0; 11578064Sume 11678064Sume if (initialized) 11778064Sume return; 11878064Sume initialized++; 11962587Sitojun#if 0 12062587Sitojun /* 12162587Sitojun * we cannot use LIST_INIT() here, since drivers may want to call 12262587Sitojun * encap_attach(), on driver attach. encap_init() will be called 12362587Sitojun * on AF_INET{,6} initialization, which happens after driver 12462587Sitojun * initialization - using LIST_INIT() here can nuke encap_attach() 12562587Sitojun * from drivers. 12662587Sitojun */ 12762587Sitojun LIST_INIT(&encaptab); 12862587Sitojun#endif 12962587Sitojun} 13062587Sitojun 13178064Sume#ifdef INET 13262587Sitojunvoid 13362587Sitojun#if __STDC__ 13462587Sitojunencap4_input(struct mbuf *m, ...) 13562587Sitojun#else 13662587Sitojunencap4_input(m, va_alist) 13762587Sitojun struct mbuf *m; 13862587Sitojun va_dcl 13962587Sitojun#endif 14062587Sitojun{ 14162587Sitojun int off, proto; 14262587Sitojun struct ip *ip; 14362587Sitojun struct sockaddr_in s, d; 14462587Sitojun const struct ipprotosw *psw; 14562587Sitojun struct encaptab *ep, *match; 14662587Sitojun va_list ap; 14762587Sitojun int prio, matchprio; 14862587Sitojun 14962587Sitojun va_start(ap, m); 15062587Sitojun off = va_arg(ap, int); 15162587Sitojun proto = va_arg(ap, int); 15262587Sitojun va_end(ap); 15362587Sitojun 15462587Sitojun ip = mtod(m, struct ip *); 15562587Sitojun 15662587Sitojun bzero(&s, sizeof(s)); 15762587Sitojun s.sin_family = AF_INET; 15862587Sitojun s.sin_len = sizeof(struct sockaddr_in); 15962587Sitojun s.sin_addr = ip->ip_src; 16062587Sitojun bzero(&d, sizeof(d)); 16162587Sitojun d.sin_family = AF_INET; 16262587Sitojun d.sin_len = sizeof(struct sockaddr_in); 16362587Sitojun d.sin_addr = ip->ip_dst; 16462587Sitojun 16562587Sitojun match = NULL; 16662587Sitojun matchprio = 0; 16771999Sphk LIST_FOREACH(ep, &encaptab, chain) { 16862587Sitojun if (ep->af != AF_INET) 16962587Sitojun continue; 17062587Sitojun if (ep->proto >= 0 && ep->proto != proto) 17162587Sitojun continue; 17262587Sitojun if (ep->func) 17362587Sitojun prio = (*ep->func)(m, off, proto, ep->arg); 17462587Sitojun else { 17562587Sitojun /* 17662587Sitojun * it's inbound traffic, we need to match in reverse 17762587Sitojun * order 17862587Sitojun */ 17962587Sitojun prio = mask_match(ep, (struct sockaddr *)&d, 18062587Sitojun (struct sockaddr *)&s); 18162587Sitojun } 18262587Sitojun 18362587Sitojun /* 18462587Sitojun * We prioritize the matches by using bit length of the 18562587Sitojun * matches. mask_match() and user-supplied matching function 18662587Sitojun * should return the bit length of the matches (for example, 18762587Sitojun * if both src/dst are matched for IPv4, 64 should be returned). 18862587Sitojun * 0 or negative return value means "it did not match". 18962587Sitojun * 19062587Sitojun * The question is, since we have two "mask" portion, we 19162587Sitojun * cannot really define total order between entries. 19262587Sitojun * For example, which of these should be preferred? 19362587Sitojun * mask_match() returns 48 (32 + 16) for both of them. 19462587Sitojun * src=3ffe::/16, dst=3ffe:501::/32 19562587Sitojun * src=3ffe:501::/32, dst=3ffe::/16 19662587Sitojun * 19762587Sitojun * We need to loop through all the possible candidates 19862587Sitojun * to get the best match - the search takes O(n) for 19962587Sitojun * n attachments (i.e. interfaces). 20062587Sitojun */ 20162587Sitojun if (prio <= 0) 20262587Sitojun continue; 20362587Sitojun if (prio > matchprio) { 20462587Sitojun matchprio = prio; 20562587Sitojun match = ep; 20662587Sitojun } 20762587Sitojun } 20862587Sitojun 20962587Sitojun if (match) { 21062587Sitojun /* found a match, "match" has the best one */ 21162587Sitojun psw = (const struct ipprotosw *)match->psw; 21262587Sitojun if (psw && psw->pr_input) { 21362587Sitojun encap_fillarg(m, match); 21462587Sitojun (*psw->pr_input)(m, off, proto); 21562587Sitojun } else 21662587Sitojun m_freem(m); 21762587Sitojun return; 21862587Sitojun } 21962587Sitojun 22062587Sitojun /* for backward compatibility */ 22162587Sitojun# ifdef MROUTING 22262587Sitojun# define COMPATFUNC ipip_input 22362587Sitojun# endif /*MROUTING*/ 22462587Sitojun 22562587Sitojun#ifdef COMPATFUNC 22662587Sitojun if (proto == IPPROTO_IPV4) { 22762587Sitojun COMPATFUNC(m, off, proto); 22862587Sitojun return; 22962587Sitojun } 23062587Sitojun#endif 23162587Sitojun 23262587Sitojun /* last resort: inject to raw socket */ 23362587Sitojun rip_input(m, off, proto); 23462587Sitojun} 23578064Sume#endif 23662587Sitojun 23762587Sitojun#ifdef INET6 23862587Sitojunint 23962587Sitojunencap6_input(mp, offp, proto) 24062587Sitojun struct mbuf **mp; 24162587Sitojun int *offp; 24262587Sitojun int proto; 24362587Sitojun{ 24462587Sitojun struct mbuf *m = *mp; 24562587Sitojun struct ip6_hdr *ip6; 24662587Sitojun struct sockaddr_in6 s, d; 24762587Sitojun const struct ip6protosw *psw; 24862587Sitojun struct encaptab *ep, *match; 24962587Sitojun int prio, matchprio; 25062587Sitojun 25162587Sitojun ip6 = mtod(m, struct ip6_hdr *); 25262587Sitojun 25362587Sitojun bzero(&s, sizeof(s)); 25462587Sitojun s.sin6_family = AF_INET6; 25562587Sitojun s.sin6_len = sizeof(struct sockaddr_in6); 25662587Sitojun s.sin6_addr = ip6->ip6_src; 25762587Sitojun bzero(&d, sizeof(d)); 25862587Sitojun d.sin6_family = AF_INET6; 25962587Sitojun d.sin6_len = sizeof(struct sockaddr_in6); 26062587Sitojun d.sin6_addr = ip6->ip6_dst; 26162587Sitojun 26262587Sitojun match = NULL; 26362587Sitojun matchprio = 0; 26471999Sphk LIST_FOREACH(ep, &encaptab, chain) { 26562587Sitojun if (ep->af != AF_INET6) 26662587Sitojun continue; 26762587Sitojun if (ep->proto >= 0 && ep->proto != proto) 26862587Sitojun continue; 26962587Sitojun if (ep->func) 27062587Sitojun prio = (*ep->func)(m, *offp, proto, ep->arg); 27162587Sitojun else { 27262587Sitojun /* 27362587Sitojun * it's inbound traffic, we need to match in reverse 27462587Sitojun * order 27562587Sitojun */ 27662587Sitojun prio = mask_match(ep, (struct sockaddr *)&d, 27762587Sitojun (struct sockaddr *)&s); 27862587Sitojun } 27962587Sitojun 28062587Sitojun /* see encap4_input() for issues here */ 28162587Sitojun if (prio <= 0) 28262587Sitojun continue; 28362587Sitojun if (prio > matchprio) { 28462587Sitojun matchprio = prio; 28562587Sitojun match = ep; 28662587Sitojun } 28762587Sitojun } 28862587Sitojun 28962587Sitojun if (match) { 29062587Sitojun /* found a match */ 29162587Sitojun psw = (const struct ip6protosw *)match->psw; 29262587Sitojun if (psw && psw->pr_input) { 29362587Sitojun encap_fillarg(m, match); 29462587Sitojun return (*psw->pr_input)(mp, offp, proto); 29562587Sitojun } else { 29662587Sitojun m_freem(m); 29762587Sitojun return IPPROTO_DONE; 29862587Sitojun } 29962587Sitojun } 30062587Sitojun 30162587Sitojun /* last resort: inject to raw socket */ 30262587Sitojun return rip6_input(mp, offp, proto); 30362587Sitojun} 30462587Sitojun#endif 30562587Sitojun 30662587Sitojunstatic void 30762587Sitojunencap_add(ep) 30862587Sitojun struct encaptab *ep; 30962587Sitojun{ 31062587Sitojun 31162587Sitojun LIST_INSERT_HEAD(&encaptab, ep, chain); 31262587Sitojun} 31362587Sitojun 31462587Sitojun/* 31562587Sitojun * sp (src ptr) is always my side, and dp (dst ptr) is always remote side. 31662587Sitojun * length of mask (sm and dm) is assumed to be same as sp/dp. 31762587Sitojun * Return value will be necessary as input (cookie) for encap_detach(). 31862587Sitojun */ 31962587Sitojunconst struct encaptab * 32062587Sitojunencap_attach(af, proto, sp, sm, dp, dm, psw, arg) 32162587Sitojun int af; 32262587Sitojun int proto; 32362587Sitojun const struct sockaddr *sp, *sm; 32462587Sitojun const struct sockaddr *dp, *dm; 32562587Sitojun const struct protosw *psw; 32662587Sitojun void *arg; 32762587Sitojun{ 32862587Sitojun struct encaptab *ep; 32962587Sitojun int error; 33062587Sitojun int s; 33162587Sitojun 33262587Sitojun s = splnet(); 33362587Sitojun /* sanity check on args */ 33462587Sitojun if (sp->sa_len > sizeof(ep->src) || dp->sa_len > sizeof(ep->dst)) { 33562587Sitojun error = EINVAL; 33662587Sitojun goto fail; 33762587Sitojun } 33862587Sitojun if (sp->sa_len != dp->sa_len) { 33962587Sitojun error = EINVAL; 34062587Sitojun goto fail; 34162587Sitojun } 34262587Sitojun if (af != sp->sa_family || af != dp->sa_family) { 34362587Sitojun error = EINVAL; 34462587Sitojun goto fail; 34562587Sitojun } 34662587Sitojun 34762587Sitojun /* check if anyone have already attached with exactly same config */ 34871999Sphk LIST_FOREACH(ep, &encaptab, chain) { 34962587Sitojun if (ep->af != af) 35062587Sitojun continue; 35162587Sitojun if (ep->proto != proto) 35262587Sitojun continue; 35362587Sitojun if (ep->src.ss_len != sp->sa_len || 35462587Sitojun bcmp(&ep->src, sp, sp->sa_len) != 0 || 35562587Sitojun bcmp(&ep->srcmask, sm, sp->sa_len) != 0) 35662587Sitojun continue; 35762587Sitojun if (ep->dst.ss_len != dp->sa_len || 35862587Sitojun bcmp(&ep->dst, dp, dp->sa_len) != 0 || 35962587Sitojun bcmp(&ep->dstmask, dm, dp->sa_len) != 0) 36062587Sitojun continue; 36162587Sitojun 36262587Sitojun error = EEXIST; 36362587Sitojun goto fail; 36462587Sitojun } 36562587Sitojun 36662587Sitojun ep = malloc(sizeof(*ep), M_NETADDR, M_NOWAIT); /*XXX*/ 36762587Sitojun if (ep == NULL) { 36862587Sitojun error = ENOBUFS; 36962587Sitojun goto fail; 37062587Sitojun } 37162587Sitojun bzero(ep, sizeof(*ep)); 37262587Sitojun 37362587Sitojun ep->af = af; 37462587Sitojun ep->proto = proto; 37562587Sitojun bcopy(sp, &ep->src, sp->sa_len); 37662587Sitojun bcopy(sm, &ep->srcmask, sp->sa_len); 37762587Sitojun bcopy(dp, &ep->dst, dp->sa_len); 37862587Sitojun bcopy(dm, &ep->dstmask, dp->sa_len); 37962587Sitojun ep->psw = psw; 38062587Sitojun ep->arg = arg; 38162587Sitojun 38262587Sitojun encap_add(ep); 38362587Sitojun 38462587Sitojun error = 0; 38562587Sitojun splx(s); 38662587Sitojun return ep; 38762587Sitojun 38862587Sitojunfail: 38962587Sitojun splx(s); 39062587Sitojun return NULL; 39162587Sitojun} 39262587Sitojun 39362587Sitojunconst struct encaptab * 39462587Sitojunencap_attach_func(af, proto, func, psw, arg) 39562587Sitojun int af; 39662587Sitojun int proto; 39762587Sitojun int (*func) __P((const struct mbuf *, int, int, void *)); 39862587Sitojun const struct protosw *psw; 39962587Sitojun void *arg; 40062587Sitojun{ 40162587Sitojun struct encaptab *ep; 40262587Sitojun int error; 40362587Sitojun int s; 40462587Sitojun 40562587Sitojun s = splnet(); 40662587Sitojun /* sanity check on args */ 40762587Sitojun if (!func) { 40862587Sitojun error = EINVAL; 40962587Sitojun goto fail; 41062587Sitojun } 41162587Sitojun 41262587Sitojun ep = malloc(sizeof(*ep), M_NETADDR, M_NOWAIT); /*XXX*/ 41362587Sitojun if (ep == NULL) { 41462587Sitojun error = ENOBUFS; 41562587Sitojun goto fail; 41662587Sitojun } 41762587Sitojun bzero(ep, sizeof(*ep)); 41862587Sitojun 41962587Sitojun ep->af = af; 42062587Sitojun ep->proto = proto; 42162587Sitojun ep->func = func; 42262587Sitojun ep->psw = psw; 42362587Sitojun ep->arg = arg; 42462587Sitojun 42562587Sitojun encap_add(ep); 42662587Sitojun 42762587Sitojun error = 0; 42862587Sitojun splx(s); 42962587Sitojun return ep; 43062587Sitojun 43162587Sitojunfail: 43262587Sitojun splx(s); 43362587Sitojun return NULL; 43462587Sitojun} 43562587Sitojun 43662587Sitojunint 43762587Sitojunencap_detach(cookie) 43862587Sitojun const struct encaptab *cookie; 43962587Sitojun{ 44062587Sitojun const struct encaptab *ep = cookie; 44162587Sitojun struct encaptab *p; 44262587Sitojun 44371999Sphk LIST_FOREACH(p, &encaptab, chain) { 44462587Sitojun if (p == ep) { 44562587Sitojun LIST_REMOVE(p, chain); 44662587Sitojun free(p, M_NETADDR); /*XXX*/ 44762587Sitojun return 0; 44862587Sitojun } 44962587Sitojun } 45062587Sitojun 45162587Sitojun return EINVAL; 45262587Sitojun} 45362587Sitojun 45462587Sitojunstatic int 45562587Sitojunmask_match(ep, sp, dp) 45662587Sitojun const struct encaptab *ep; 45762587Sitojun const struct sockaddr *sp; 45862587Sitojun const struct sockaddr *dp; 45962587Sitojun{ 46062587Sitojun struct sockaddr_storage s; 46162587Sitojun struct sockaddr_storage d; 46262587Sitojun int i; 46362587Sitojun const u_int8_t *p, *q; 46462587Sitojun u_int8_t *r; 46562587Sitojun int matchlen; 46662587Sitojun 46762587Sitojun if (sp->sa_len > sizeof(s) || dp->sa_len > sizeof(d)) 46862587Sitojun return 0; 46962587Sitojun if (sp->sa_family != ep->af || dp->sa_family != ep->af) 47062587Sitojun return 0; 47162587Sitojun if (sp->sa_len != ep->src.ss_len || dp->sa_len != ep->dst.ss_len) 47262587Sitojun return 0; 47362587Sitojun 47462587Sitojun matchlen = 0; 47562587Sitojun 47662587Sitojun p = (const u_int8_t *)sp; 47762587Sitojun q = (const u_int8_t *)&ep->srcmask; 47862587Sitojun r = (u_int8_t *)&s; 47962587Sitojun for (i = 0 ; i < sp->sa_len; i++) { 48062587Sitojun r[i] = p[i] & q[i]; 48162587Sitojun /* XXX estimate */ 48262587Sitojun matchlen += (q[i] ? 8 : 0); 48362587Sitojun } 48462587Sitojun 48562587Sitojun p = (const u_int8_t *)dp; 48662587Sitojun q = (const u_int8_t *)&ep->dstmask; 48762587Sitojun r = (u_int8_t *)&d; 48862587Sitojun for (i = 0 ; i < dp->sa_len; i++) { 48962587Sitojun r[i] = p[i] & q[i]; 49062587Sitojun /* XXX rough estimate */ 49162587Sitojun matchlen += (q[i] ? 8 : 0); 49262587Sitojun } 49362587Sitojun 49462587Sitojun /* need to overwrite len/family portion as we don't compare them */ 49562587Sitojun s.ss_len = sp->sa_len; 49662587Sitojun s.ss_family = sp->sa_family; 49762587Sitojun d.ss_len = dp->sa_len; 49862587Sitojun d.ss_family = dp->sa_family; 49962587Sitojun 50062587Sitojun if (bcmp(&s, &ep->src, ep->src.ss_len) == 0 && 50162587Sitojun bcmp(&d, &ep->dst, ep->dst.ss_len) == 0) { 50262587Sitojun return matchlen; 50362587Sitojun } else 50462587Sitojun return 0; 50562587Sitojun} 50662587Sitojun 50762587Sitojunstatic void 50862587Sitojunencap_fillarg(m, ep) 50962587Sitojun struct mbuf *m; 51062587Sitojun const struct encaptab *ep; 51162587Sitojun{ 51262587Sitojun#if 0 51362587Sitojun m->m_pkthdr.aux = ep->arg; 51462587Sitojun#else 51562587Sitojun struct mbuf *n; 51662587Sitojun 51762587Sitojun n = m_aux_add(m, AF_INET, IPPROTO_IPV4); 51862587Sitojun if (n) { 51962587Sitojun *mtod(n, void **) = ep->arg; 52062587Sitojun n->m_len = sizeof(void *); 52162587Sitojun } 52262587Sitojun#endif 52362587Sitojun} 52462587Sitojun 52562587Sitojunvoid * 52662587Sitojunencap_getarg(m) 52762587Sitojun struct mbuf *m; 52862587Sitojun{ 52962587Sitojun void *p; 53062587Sitojun#if 0 53162587Sitojun p = m->m_pkthdr.aux; 53262587Sitojun m->m_pkthdr.aux = NULL; 53362587Sitojun return p; 53462587Sitojun#else 53562587Sitojun struct mbuf *n; 53662587Sitojun 53762587Sitojun p = NULL; 53862587Sitojun n = m_aux_find(m, AF_INET, IPPROTO_IPV4); 53962587Sitojun if (n) { 54062587Sitojun if (n->m_len == sizeof(void *)) 54162587Sitojun p = *mtod(n, void **); 54262587Sitojun m_aux_delete(m, n); 54362587Sitojun } 54462587Sitojun return p; 54562587Sitojun#endif 54662587Sitojun} 547