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Release 4.8 net/netfilter/nf_conntrack_pptp.c

Directory: net/netfilter
/*
 * Connection tracking support for PPTP (Point to Point Tunneling Protocol).
 * PPTP is a a protocol for creating virtual private networks.
 * It is a specification defined by Microsoft and some vendors
 * working with Microsoft.  PPTP is built on top of a modified
 * version of the Internet Generic Routing Encapsulation Protocol.
 * GRE is defined in RFC 1701 and RFC 1702.  Documentation of
 * PPTP can be found in RFC 2637
 *
 * (C) 2000-2005 by Harald Welte <laforge@gnumonks.org>
 *
 * Development of this code funded by Astaro AG (http://www.astaro.com/)
 *
 * (C) 2006-2012 Patrick McHardy <kaber@trash.net>
 *
 * Limitations:
 *       - We blindly assume that control connections are always
 *         established in PNS->PAC direction.  This is a violation
 *         of RFC 2637
 *       - We can only support one single call within each session
 * TODO:
 *       - testing of incoming PPTP calls
 */

#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/in.h>
#include <linux/tcp.h>

#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_zones.h>
#include <linux/netfilter/nf_conntrack_proto_gre.h>
#include <linux/netfilter/nf_conntrack_pptp.h>


#define NF_CT_PPTP_VERSION "3.1"

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
MODULE_DESCRIPTION("Netfilter connection tracking helper module for PPTP");
MODULE_ALIAS("ip_conntrack_pptp");
MODULE_ALIAS_NFCT_HELPER("pptp");

static DEFINE_SPINLOCK(nf_pptp_lock);

int
(*nf_nat_pptp_hook_outbound)(struct sk_buff *skb,
			     struct nf_conn *ct, enum ip_conntrack_info ctinfo,
			     unsigned int protoff, struct PptpControlHeader *ctlh,
			     union pptp_ctrl_union *pptpReq) __read_mostly;

EXPORT_SYMBOL_GPL(nf_nat_pptp_hook_outbound);

int
(*nf_nat_pptp_hook_inbound)(struct sk_buff *skb,
			    struct nf_conn *ct, enum ip_conntrack_info ctinfo,
			    unsigned int protoff, struct PptpControlHeader *ctlh,
			    union pptp_ctrl_union *pptpReq) __read_mostly;

EXPORT_SYMBOL_GPL(nf_nat_pptp_hook_inbound);

void
(*nf_nat_pptp_hook_exp_gre)(struct nf_conntrack_expect *expect_orig,
			    struct nf_conntrack_expect *expect_reply)
			    __read_mostly;

EXPORT_SYMBOL_GPL(nf_nat_pptp_hook_exp_gre);

void
(*nf_nat_pptp_hook_expectfn)(struct nf_conn *ct,
			     struct nf_conntrack_expect *exp) __read_mostly;

EXPORT_SYMBOL_GPL(nf_nat_pptp_hook_expectfn);

#if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG)
/* PptpControlMessageType names */

const char *const pptp_msg_name[] = {
	"UNKNOWN_MESSAGE",
	"START_SESSION_REQUEST",
	"START_SESSION_REPLY",
	"STOP_SESSION_REQUEST",
	"STOP_SESSION_REPLY",
	"ECHO_REQUEST",
	"ECHO_REPLY",
	"OUT_CALL_REQUEST",
	"OUT_CALL_REPLY",
	"IN_CALL_REQUEST",
	"IN_CALL_REPLY",
	"IN_CALL_CONNECT",
	"CALL_CLEAR_REQUEST",
	"CALL_DISCONNECT_NOTIFY",
	"WAN_ERROR_NOTIFY",
	"SET_LINK_INFO"
};

EXPORT_SYMBOL(pptp_msg_name);
#endif


#define SECS *HZ

#define MINS * 60 SECS

#define HOURS * 60 MINS


#define PPTP_GRE_TIMEOUT 		(10 MINS)

#define PPTP_GRE_STREAM_TIMEOUT 	(5 HOURS)


static void pptp_expectfn(struct nf_conn *ct, struct nf_conntrack_expect *exp) { struct net *net = nf_ct_net(ct); typeof(nf_nat_pptp_hook_expectfn) nf_nat_pptp_expectfn; pr_debug("increasing timeouts\n"); /* increase timeout of GRE data channel conntrack entry */ ct->proto.gre.timeout = PPTP_GRE_TIMEOUT; ct->proto.gre.stream_timeout = PPTP_GRE_STREAM_TIMEOUT; /* Can you see how rusty this code is, compared with the pre-2.6.11 * one? That's what happened to my shiny newnat of 2002 ;( -HW */ rcu_read_lock(); nf_nat_pptp_expectfn = rcu_dereference(nf_nat_pptp_hook_expectfn); if (nf_nat_pptp_expectfn && ct->master->status & IPS_NAT_MASK) nf_nat_pptp_expectfn(ct, exp); else { struct nf_conntrack_tuple inv_t; struct nf_conntrack_expect *exp_other; /* obviously this tuple inversion only works until you do NAT */ nf_ct_invert_tuplepr(&inv_t, &exp->tuple); pr_debug("trying to unexpect other dir: "); nf_ct_dump_tuple(&inv_t); exp_other = nf_ct_expect_find_get(net, nf_ct_zone(ct), &inv_t); if (exp_other) { /* delete other expectation. */ pr_debug("found\n"); nf_ct_unexpect_related(exp_other); nf_ct_expect_put(exp_other); } else { pr_debug("not found\n"); } } rcu_read_unlock(); }

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static int destroy_sibling_or_exp(struct net *net, struct nf_conn *ct, const struct nf_conntrack_tuple *t) { const struct nf_conntrack_tuple_hash *h; const struct nf_conntrack_zone *zone; struct nf_conntrack_expect *exp; struct nf_conn *sibling; pr_debug("trying to timeout ct or exp for tuple "); nf_ct_dump_tuple(t); zone = nf_ct_zone(ct); h = nf_conntrack_find_get(net, zone, t); if (h) { sibling = nf_ct_tuplehash_to_ctrack(h); pr_debug("setting timeout of conntrack %p to 0\n", sibling); sibling->proto.gre.timeout = 0; sibling->proto.gre.stream_timeout = 0; if (del_timer(&sibling->timeout)) sibling->timeout.function((unsigned long)sibling); nf_ct_put(sibling); return 1; } else { exp = nf_ct_expect_find_get(net, zone, t); if (exp) { pr_debug("unexpect_related of expect %p\n", exp); nf_ct_unexpect_related(exp); nf_ct_expect_put(exp); return 1; } } return 0; }

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jan engelhardtjan engelhardt21.08%220.00%
Total186100.00%10100.00%

/* timeout GRE data connections */
static void pptp_destroy_siblings(struct nf_conn *ct) { struct net *net = nf_ct_net(ct); const struct nf_ct_pptp_master *ct_pptp_info = nfct_help_data(ct); struct nf_conntrack_tuple t; nf_ct_gre_keymap_destroy(ct); /* try original (pns->pac) tuple */ memcpy(&t, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, sizeof(t)); t.dst.protonum = IPPROTO_GRE; t.src.u.gre.key = ct_pptp_info->pns_call_id; t.dst.u.gre.key = ct_pptp_info->pac_call_id; if (!destroy_sibling_or_exp(net, ct, &t)) pr_debug("failed to timeout original pns->pac ct/exp\n"); /* try reply (pac->pns) tuple */ memcpy(&t, &ct->tuplehash[IP_CT_DIR_REPLY].tuple, sizeof(t)); t.dst.protonum = IPPROTO_GRE; t.src.u.gre.key = ct_pptp_info->pac_call_id; t.dst.u.gre.key = ct_pptp_info->pns_call_id; if (!destroy_sibling_or_exp(net, ct, &t)) pr_debug("failed to timeout reply pac->pns ct/exp\n"); }

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Total193100.00%6100.00%

/* expect GRE connections (PNS->PAC and PAC->PNS direction) */
static int exp_gre(struct nf_conn *ct, __be16 callid, __be16 peer_callid) { struct nf_conntrack_expect *exp_orig, *exp_reply; enum ip_conntrack_dir dir; int ret = 1; typeof(nf_nat_pptp_hook_exp_gre) nf_nat_pptp_exp_gre; exp_orig = nf_ct_expect_alloc(ct); if (exp_orig == NULL) goto out; exp_reply = nf_ct_expect_alloc(ct); if (exp_reply == NULL) goto out_put_orig; /* original direction, PNS->PAC */ dir = IP_CT_DIR_ORIGINAL; nf_ct_expect_init(exp_orig, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), &ct->tuplehash[dir].tuple.src.u3, &ct->tuplehash[dir].tuple.dst.u3, IPPROTO_GRE, &peer_callid, &callid); exp_orig->expectfn = pptp_expectfn; /* reply direction, PAC->PNS */ dir = IP_CT_DIR_REPLY; nf_ct_expect_init(exp_reply, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), &ct->tuplehash[dir].tuple.src.u3, &ct->tuplehash[dir].tuple.dst.u3, IPPROTO_GRE, &callid, &peer_callid); exp_reply->expectfn = pptp_expectfn; nf_nat_pptp_exp_gre = rcu_dereference(nf_nat_pptp_hook_exp_gre); if (nf_nat_pptp_exp_gre && ct->status & IPS_NAT_MASK) nf_nat_pptp_exp_gre(exp_orig, exp_reply); if (nf_ct_expect_related(exp_orig) != 0) goto out_put_both; if (nf_ct_expect_related(exp_reply) != 0) goto out_unexpect_orig; /* Add GRE keymap entries */ if (nf_ct_gre_keymap_add(ct, IP_CT_DIR_ORIGINAL, &exp_orig->tuple) != 0) goto out_unexpect_both; if (nf_ct_gre_keymap_add(ct, IP_CT_DIR_REPLY, &exp_reply->tuple) != 0) { nf_ct_gre_keymap_destroy(ct); goto out_unexpect_both; } ret = 0; out_put_both: nf_ct_expect_put(exp_reply); out_put_orig: nf_ct_expect_put(exp_orig); out: return ret; out_unexpect_both: nf_ct_unexpect_related(exp_reply); out_unexpect_orig: nf_ct_unexpect_related(exp_orig); goto out_put_both; }

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static inline int pptp_inbound_pkt(struct sk_buff *skb, unsigned int protoff, struct PptpControlHeader *ctlh, union pptp_ctrl_union *pptpReq, unsigned int reqlen, struct nf_conn *ct, enum ip_conntrack_info ctinfo) { struct nf_ct_pptp_master *info = nfct_help_data(ct); u_int16_t msg; __be16 cid = 0, pcid = 0; typeof(nf_nat_pptp_hook_inbound) nf_nat_pptp_inbound; msg = ntohs(ctlh->messageType); pr_debug("inbound control message %s\n", pptp_msg_name[msg]); switch (msg) { case PPTP_START_SESSION_REPLY: /* server confirms new control session */ if (info->sstate < PPTP_SESSION_REQUESTED) goto invalid; if (pptpReq->srep.resultCode == PPTP_START_OK) info->sstate = PPTP_SESSION_CONFIRMED; else info->sstate = PPTP_SESSION_ERROR; break; case PPTP_STOP_SESSION_REPLY: /* server confirms end of control session */ if (info->sstate > PPTP_SESSION_STOPREQ) goto invalid; if (pptpReq->strep.resultCode == PPTP_STOP_OK) info->sstate = PPTP_SESSION_NONE; else info->sstate = PPTP_SESSION_ERROR; break; case PPTP_OUT_CALL_REPLY: /* server accepted call, we now expect GRE frames */ if (info->sstate != PPTP_SESSION_CONFIRMED) goto invalid; if (info->cstate != PPTP_CALL_OUT_REQ && info->cstate != PPTP_CALL_OUT_CONF) goto invalid; cid = pptpReq->ocack.callID; pcid = pptpReq->ocack.peersCallID; if (info->pns_call_id != pcid) goto invalid; pr_debug("%s, CID=%X, PCID=%X\n", pptp_msg_name[msg], ntohs(cid), ntohs(pcid)); if (pptpReq->ocack.resultCode == PPTP_OUTCALL_CONNECT) { info->cstate = PPTP_CALL_OUT_CONF; info->pac_call_id = cid; exp_gre(ct, cid, pcid); } else info->cstate = PPTP_CALL_NONE; break; case PPTP_IN_CALL_REQUEST: /* server tells us about incoming call request */ if (info->sstate != PPTP_SESSION_CONFIRMED) goto invalid; cid = pptpReq->icreq.callID; pr_debug("%s, CID=%X\n", pptp_msg_name[msg], ntohs(cid)); info->cstate = PPTP_CALL_IN_REQ; info->pac_call_id = cid; break; case PPTP_IN_CALL_CONNECT: /* server tells us about incoming call established */ if (info->sstate != PPTP_SESSION_CONFIRMED) goto invalid; if (info->cstate != PPTP_CALL_IN_REP && info->cstate != PPTP_CALL_IN_CONF) goto invalid; pcid = pptpReq->iccon.peersCallID; cid = info->pac_call_id; if (info->pns_call_id != pcid) goto invalid; pr_debug("%s, PCID=%X\n", pptp_msg_name[msg], ntohs(pcid)); info->cstate = PPTP_CALL_IN_CONF; /* we expect a GRE connection from PAC to PNS */ exp_gre(ct, cid, pcid); break; case PPTP_CALL_DISCONNECT_NOTIFY: /* server confirms disconnect */ cid = pptpReq->disc.callID; pr_debug("%s, CID=%X\n", pptp_msg_name[msg], ntohs(cid)); info->cstate = PPTP_CALL_NONE; /* untrack this call id, unexpect GRE packets */ pptp_destroy_siblings(ct); break; case PPTP_WAN_ERROR_NOTIFY: case PPTP_SET_LINK_INFO: case PPTP_ECHO_REQUEST: case PPTP_ECHO_REPLY: /* I don't have to explain these ;) */ break; default: goto invalid; } nf_nat_pptp_inbound = rcu_dereference(nf_nat_pptp_hook_inbound); if (nf_nat_pptp_inbound && ct->status & IPS_NAT_MASK) return nf_nat_pptp_inbound(skb, ct, ctinfo, protoff, ctlh, pptpReq); return NF_ACCEPT; invalid: pr_debug("invalid %s: type=%d cid=%u pcid=%u " "cstate=%d sstate=%d pns_cid=%u pac_cid=%u\n", msg <= PPTP_MSG_MAX ? pptp_msg_name[msg] : pptp_msg_name[0], msg, ntohs(cid), ntohs(pcid), info->cstate, info->sstate, ntohs(info->pns_call_id), ntohs(info->pac_call_id)); return NF_ACCEPT; }

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static inline int pptp_outbound_pkt(struct sk_buff *skb, unsigned int protoff, struct PptpControlHeader *ctlh, union pptp_ctrl_union *pptpReq, unsigned int reqlen, struct nf_conn *ct, enum ip_conntrack_info ctinfo) { struct nf_ct_pptp_master *info = nfct_help_data(ct); u_int16_t msg; __be16 cid = 0, pcid = 0; typeof(nf_nat_pptp_hook_outbound) nf_nat_pptp_outbound; msg = ntohs(ctlh->messageType); pr_debug("outbound control message %s\n", pptp_msg_name[msg]); switch (msg) { case PPTP_START_SESSION_REQUEST: /* client requests for new control session */ if (info->sstate != PPTP_SESSION_NONE) goto invalid; info->sstate = PPTP_SESSION_REQUESTED; break; case PPTP_STOP_SESSION_REQUEST: /* client requests end of control session */ info->sstate = PPTP_SESSION_STOPREQ; break; case PPTP_OUT_CALL_REQUEST: /* client initiating connection to server */ if (info->sstate != PPTP_SESSION_CONFIRMED) goto invalid; info->cstate = PPTP_CALL_OUT_REQ; /* track PNS call id */ cid = pptpReq->ocreq.callID; pr_debug("%s, CID=%X\n", pptp_msg_name[msg], ntohs(cid)); info->pns_call_id = cid; break; case PPTP_IN_CALL_REPLY: /* client answers incoming call */ if (info->cstate != PPTP_CALL_IN_REQ && info->cstate != PPTP_CALL_IN_REP) goto invalid; cid = pptpReq->icack.callID; pcid = pptpReq->icack.peersCallID; if (info->pac_call_id != pcid) goto invalid; pr_debug("%s, CID=%X PCID=%X\n", pptp_msg_name[msg], ntohs(cid), ntohs(pcid)); if (pptpReq->icack.resultCode == PPTP_INCALL_ACCEPT) { /* part two of the three-way handshake */ info->cstate = PPTP_CALL_IN_REP; info->pns_call_id = cid; } else info->cstate = PPTP_CALL_NONE; break; case PPTP_CALL_CLEAR_REQUEST: /* client requests hangup of call */ if (info->sstate != PPTP_SESSION_CONFIRMED) goto invalid; /* FUTURE: iterate over all calls and check if * call ID is valid. We don't do this without newnat, * because we only know about last call */ info->cstate = PPTP_CALL_CLEAR_REQ; break; case PPTP_SET_LINK_INFO: case PPTP_ECHO_REQUEST: case PPTP_ECHO_REPLY: /* I don't have to explain these ;) */ break; default: goto invalid; } nf_nat_pptp_outbound = rcu_dereference(nf_nat_pptp_hook_outbound); if (nf_nat_pptp_outbound && ct->status & IPS_NAT_MASK) return nf_nat_pptp_outbound(skb, ct, ctinfo, protoff, ctlh, pptpReq); return NF_ACCEPT; invalid: pr_debug("invalid %s: type=%d cid=%u pcid=%u " "cstate=%d sstate=%d pns_cid=%u pac_cid=%u\n", msg <= PPTP_MSG_MAX ? pptp_msg_name[msg] : pptp_msg_name[0], msg, ntohs(cid), ntohs(pcid), info->cstate, info->sstate, ntohs(info->pns_call_id), ntohs(info->pac_call_id)); return NF_ACCEPT; }

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Total411100.00%5100.00%

static const unsigned int pptp_msg_size[] = { [PPTP_START_SESSION_REQUEST] = sizeof(struct PptpStartSessionRequest), [PPTP_START_SESSION_REPLY] = sizeof(struct PptpStartSessionReply), [PPTP_STOP_SESSION_REQUEST] = sizeof(struct PptpStopSessionRequest), [PPTP_STOP_SESSION_REPLY] = sizeof(struct PptpStopSessionReply), [PPTP_OUT_CALL_REQUEST] = sizeof(struct PptpOutCallRequest), [PPTP_OUT_CALL_REPLY] = sizeof(struct PptpOutCallReply), [PPTP_IN_CALL_REQUEST] = sizeof(struct PptpInCallRequest), [PPTP_IN_CALL_REPLY] = sizeof(struct PptpInCallReply), [PPTP_IN_CALL_CONNECT] = sizeof(struct PptpInCallConnected), [PPTP_CALL_CLEAR_REQUEST] = sizeof(struct PptpClearCallRequest), [PPTP_CALL_DISCONNECT_NOTIFY] = sizeof(struct PptpCallDisconnectNotify), [PPTP_WAN_ERROR_NOTIFY] = sizeof(struct PptpWanErrorNotify), [PPTP_SET_LINK_INFO] = sizeof(struct PptpSetLinkInfo), }; /* track caller id inside control connection, call expect_related */
static int conntrack_pptp_help(struct sk_buff *skb, unsigned int protoff, struct nf_conn *ct, enum ip_conntrack_info ctinfo) { int dir = CTINFO2DIR(ctinfo); const struct nf_ct_pptp_master *info = nfct_help_data(ct); const struct tcphdr *tcph; struct tcphdr _tcph; const struct pptp_pkt_hdr *pptph; struct pptp_pkt_hdr _pptph; struct PptpControlHeader _ctlh, *ctlh; union pptp_ctrl_union _pptpReq, *pptpReq; unsigned int tcplen = skb->len - protoff; unsigned int datalen, reqlen, nexthdr_off; int oldsstate, oldcstate; int ret; u_int16_t msg; /* don't do any tracking before tcp handshake complete */ if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY) return NF_ACCEPT; nexthdr_off = protoff; tcph = skb_header_pointer(skb, nexthdr_off, sizeof(_tcph), &_tcph); BUG_ON(!tcph); nexthdr_off += tcph->doff * 4; datalen = tcplen - tcph->doff * 4; pptph = skb_header_pointer(skb, nexthdr_off, sizeof(_pptph), &_pptph); if (!pptph) { pr_debug("no full PPTP header, can't track\n"); return NF_ACCEPT; } nexthdr_off += sizeof(_pptph); datalen -= sizeof(_pptph); /* if it's not a control message we can't do anything with it */ if (ntohs(pptph->packetType) != PPTP_PACKET_CONTROL || ntohl(pptph->magicCookie) != PPTP_MAGIC_COOKIE) { pr_debug("not a control packet\n"); return NF_ACCEPT; } ctlh = skb_header_pointer(skb, nexthdr_off, sizeof(_ctlh), &_ctlh); if (!ctlh) return NF_ACCEPT; nexthdr_off += sizeof(_ctlh); datalen -= sizeof(_ctlh); reqlen = datalen; msg = ntohs(ctlh->messageType); if (msg > 0 && msg <= PPTP_MSG_MAX && reqlen < pptp_msg_size[msg]) return NF_ACCEPT; if (reqlen > sizeof(*pptpReq)) reqlen = sizeof(*pptpReq); pptpReq = skb_header_pointer(skb, nexthdr_off, reqlen, &_pptpReq); if (!pptpReq) return NF_ACCEPT; oldsstate = info->sstate; oldcstate = info->cstate; spin_lock_bh(&nf_pptp_lock); /* FIXME: We just blindly assume that the control connection is always * established from PNS->PAC. However, RFC makes no guarantee */ if (dir == IP_CT_DIR_ORIGINAL) /* client -> server (PNS -> PAC) */ ret = pptp_outbound_pkt(skb, protoff, ctlh, pptpReq, reqlen, ct, ctinfo); else /* server -> client (PAC -> PNS) */ ret = pptp_inbound_pkt(skb, protoff, ctlh, pptpReq, reqlen, ct, ctinfo); pr_debug("sstate: %d->%d, cstate: %d->%d\n", oldsstate, info->sstate, oldcstate, info->cstate); spin_unlock_bh(&nf_pptp_lock); return ret; }

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static const struct nf_conntrack_expect_policy pptp_exp_policy = { .max_expected = 2, .timeout = 5 * 60, }; /* control protocol helper */ static struct nf_conntrack_helper pptp __read_mostly = { .name = "pptp", .me = THIS_MODULE, .data_len = sizeof(struct nf_ct_pptp_master), .tuple.src.l3num = AF_INET, .tuple.src.u.tcp.port = cpu_to_be16(PPTP_CONTROL_PORT), .tuple.dst.protonum = IPPROTO_TCP, .help = conntrack_pptp_help, .destroy = pptp_destroy_siblings, .expect_policy = &pptp_exp_policy, };
static int __init nf_conntrack_pptp_init(void) { return nf_conntrack_helper_register(&pptp); }

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static void __exit nf_conntrack_pptp_fini(void) { nf_conntrack_helper_unregister(&pptp); }

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module_init(nf_conntrack_pptp_init); module_exit(