22  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
82 	if (ah->dport == NULL || ah->sport == NULL || ah->lnk == NULL)  in fingerprint()
83 		return (-1);  in fingerprint()
84 	if (ntohs(*ah->dport) == PPTP_CONTROL_PORT_NUMBER  in fingerprint()
85 	    || ntohs(*ah->sport) == PPTP_CONTROL_PORT_NUMBER)  in fingerprint()
87 	return (-1);  in fingerprint()
99 	AliasHandlePptpIn(la, pip, ah->lnk);  in protohandlerin()
106 	AliasHandlePptpOut(la, pip, ah->lnk);  in protohandlerout()
113 	if (la->packetAliasMode & PKT_ALIAS_PROXY_ONLY ||  in protohandlergrein()
116 	return (-1);  in protohandlergrein()
124 	return (-1);  in protohandlergreout()
201    "de-aliasing" of incoming packets, this is different than any other
209    into a single TCP packet.  This is typically the case, but is not
269 	u_int32_t	magic;	/* magic cookie */  member
291     struct ip *pip,		/* IP packet to examine/patch */  in AliasHandlePptpOut()
315 		    GetAliasAddress(lnk), cptr->cid1);  in AliasHandlePptpOut()
324 		    GetDestAddress(lnk), cptr->cid1);  in AliasHandlePptpOut()
331 		int accumulate = cptr->cid1;  in AliasHandlePptpOut()
334 		cptr->cid1 = GetAliasPort(pptp_lnk);  in AliasHandlePptpOut()
336 		/* Compute TCP checksum for revised packet */  in AliasHandlePptpOut()
338 		accumulate -= cptr->cid1;  in AliasHandlePptpOut()
339 		ADJUST_CHECKSUM(accumulate, tc->th_sum);  in AliasHandlePptpOut()
345 			if (codes->resCode == 1)  in AliasHandlePptpOut()
348 				SetDestCallId(pptp_lnk, cptr->cid2);  in AliasHandlePptpOut()
363     struct ip *pip,		/* IP packet to examine/patch */  in AliasHandlePptpIn()
381 		pcall_id = &cptr->cid1;  in AliasHandlePptpIn()
385 		pcall_id = &cptr->cid2;  in AliasHandlePptpIn()
390 		    GetAliasAddress(lnk), cptr->cid1);  in AliasHandlePptpIn()
405 		/* De-alias the Peer's Call Id. */  in AliasHandlePptpIn()
408 		/* Compute TCP checksum for modified packet */  in AliasHandlePptpIn()
410 		accumulate -= *pcall_id;  in AliasHandlePptpIn()
411 		ADJUST_CHECKSUM(accumulate, tc->th_sum);  in AliasHandlePptpIn()
417 			if (codes->resCode == 1)  in AliasHandlePptpIn()
420 				SetDestCallId(pptp_lnk, cptr->cid1);  in AliasHandlePptpIn()
429 AliasVerifyPptp(struct ip *pip, u_int16_t * ptype) /* IP packet to examine/patch */  in AliasVerifyPptp()
437 	hlen = (pip->ip_hl + tc->th_off) << 2;  in AliasVerifyPptp()
438 	tlen = ntohs(pip->ip_len);  in AliasVerifyPptp()
439 	dlen = tlen - hlen;  in AliasVerifyPptp()
449 	*ptype = ntohs(hptr->type);  in AliasVerifyPptp()
452 	if ((ntohs(hptr->msgType) != PPTP_CTRL_MSG_TYPE) ||  in AliasVerifyPptp()
453 	    (ntohl(hptr->magic) != PPTP_MAGIC))  in AliasVerifyPptp()
475 		return (-1);  in AliasHandlePptpGreOut()
477 	lnk = FindPptpOutByPeerCallId(la, pip->ip_src, pip->ip_dst, gr->gh_call_id);  in AliasHandlePptpGreOut()
482 		DifferentialChecksum(&pip->ip_sum,  in AliasHandlePptpGreOut()
483 		    &alias_addr, &pip->ip_src, 2);  in AliasHandlePptpGreOut()
484 		pip->ip_src = alias_addr;  in AliasHandlePptpGreOut()
499 		return (-1);  in AliasHandlePptpGreIn()
501 	lnk = FindPptpInByPeerCallId(la, pip->ip_src, pip->ip_dst, gr->gh_call_id);  in AliasHandlePptpGreIn()
505 		/* De-alias the Peer's Call Id. */  in AliasHandlePptpGreIn()
506 		gr->gh_call_id = GetOriginalPort(lnk);  in AliasHandlePptpGreIn()
509 		DifferentialChecksum(&pip->ip_sum,  in AliasHandlePptpGreIn()
510 		    &src_addr, &pip->ip_dst, 2);  in AliasHandlePptpGreIn()
511 		pip->ip_dst = src_addr;  in AliasHandlePptpGreIn()