239 	struct tcphdr *th, *oth;  in slhc_compress()  local
251 	if (ip->version != 4 || ip->ihl < 5)  in slhc_compress()
263 	nlen = ip->ihl * 4;  in slhc_compress()
264 	if (isize < nlen + sizeof(*th))  in slhc_compress()
267 	th = (struct tcphdr *)(icp + nlen);  in slhc_compress()
268 	if (th->doff < sizeof(struct tcphdr) / 4)  in slhc_compress()
270 	hlen = nlen + th->doff * 4;  in slhc_compress()
276 	if(hlen > isize || th->syn || th->fin || th->rst ||  in slhc_compress()
277 	    ! (th->ack)){  in slhc_compress()
299 		 && th->source == cs->cs_tcp.source  in slhc_compress()
300 		 && th->dest == cs->cs_tcp.dest)  in slhc_compress()
357 	 || th->doff != cs->cs_tcp.doff  in slhc_compress()
358 	 || (ip->ihl > 5 && memcmp(ip+1,cs->cs_ipopt,((ip->ihl)-5)*4) != 0)  in slhc_compress()
359 	 || (th->doff > 5 && memcmp(th+1,cs->cs_tcpopt,((th->doff)-5)*4) != 0)){  in slhc_compress()
369 	if(th->urg){  in slhc_compress()
370 		deltaS = ntohs(th->urg_ptr);  in slhc_compress()
373 	} else if(th->urg_ptr != oth->urg_ptr){  in slhc_compress()
380 	if((deltaS = ntohs(th->window) - ntohs(oth->window)) != 0){  in slhc_compress()
384 	if((deltaA = ntohl(th->ack_seq) - ntohl(oth->ack_seq)) != 0L){  in slhc_compress()
390 	if((deltaS = ntohl(th->seq) - ntohl(oth->seq)) != 0L){  in slhc_compress()
436 	if(th->psh)  in slhc_compress()
441 	csum = th->check;  in slhc_compress()
443 	memcpy(&cs->cs_tcp,th,20);  in slhc_compress()
448 	 * So, (cp - new_seq) + 4 bytes of header are needed.  in slhc_compress()
477 	memcpy(&cs->cs_tcp,th,20);  in slhc_compress()
479 	  memcpy(cs->cs_ipopt, ip+1, ((ip->ihl) - 5) * 4);  in slhc_compress()
480 	if (th->doff > 5)  in slhc_compress()
481 	  memcpy(cs->cs_tcpopt, th+1, ((th->doff) - 5) * 4);  in slhc_compress()
547 	hdrlen = ip->ihl * 4 + thp->doff * 4;  in slhc_uncompress()
621 	  memcpy(cp, cs->cs_ipopt, (ip->ihl - 5) * 4);  in slhc_uncompress()
622 	  cp += (ip->ihl - 5) * 4;  in slhc_uncompress()
632 	  memcpy(cp, cs->cs_tcpopt, ((thp->doff) - 5) * 4);  in slhc_uncompress()
633 	  cp += ((thp->doff) - 5) * 4;  in slhc_uncompress()
658 	if(ihl < 20 / 4){  in slhc_remember()
680 	memcpy(&cs->cs_tcp,icp + ihl*4,20);  in slhc_remember()
682 	  memcpy(cs->cs_ipopt, icp + sizeof(struct iphdr), (ihl - 5) * 4);  in slhc_remember()
684 	  memcpy(cs->cs_tcpopt, icp + ihl*4 + sizeof(struct tcphdr), (cs->cs_tcp.doff - 5) * 4);  in slhc_remember()