51 static struct ip *ip_reass(register struct ip *ip,
78 	register struct ip *ip;  in ip_input()  local
87 	if (m->m_len < sizeof (struct ip)) {  in ip_input()
92 	ip = mtod(m, struct ip *);  in ip_input()
94 	if (ip->ip_v != IPVERSION) {  in ip_input()
99 	hlen = ip->ip_hl << 2;  in ip_input()
100 	if (hlen<sizeof(struct ip ) || hlen>m->m_len) {/* min header length */  in ip_input()
117 	NTOHS(ip->ip_len);  in ip_input()
118 	if (ip->ip_len < hlen) {  in ip_input()
122 	NTOHS(ip->ip_id);  in ip_input()
123 	NTOHS(ip->ip_off);  in ip_input()
131 	if (m->m_len < ip->ip_len) {  in ip_input()
137         if (ip_geth(ip->ip_dst) != special_addr_ip) {  in ip_input()
138             if (ip_getn(ip->ip_dst) == 0xffffffffu && ip->ip_p != IPPROTO_UDP)  in ip_input()
141             int host = ip_geth(ip->ip_dst) & 0xff;  in ip_input()
157 	if (m->m_len > ip->ip_len)  in ip_input()
158 	   m_adj(m, ip->ip_len - m->m_len);  in ip_input()
161 	if(ip->ip_ttl==0 || ip->ip_ttl==1) {  in ip_input()
185 	if (ip->ip_off &~ IP_DF) {  in ip_input()
194             if (ip->ip_id == fp->ipq_id &&  in ip_input()
195 		      ip_equal(ip->ip_src, fp->ipq_src) &&  in ip_input()
196 		      ip_equal(ip->ip_dst, fp->ipq_dst) &&  in ip_input()
197 		      ip->ip_p == fp->ipq_p)  in ip_input()
208 		ip->ip_len -= hlen;  in ip_input()
209 		if (ip->ip_off & IP_MF)  in ip_input()
210 		  ip->ip_tos |= 1;  in ip_input()
212 		  ip->ip_tos &= ~1;  in ip_input()
214 		ip->ip_off <<= 3;  in ip_input()
221 		if (ip->ip_tos & 1 || ip->ip_off) {  in ip_input()
223 			ip = ip_reass(ip, fp);  in ip_input()
224 			if (ip == NULL)  in ip_input()
227 			m = dtom(ip);  in ip_input()
233 		ip->ip_len -= hlen;  in ip_input()
239 	switch (ip->ip_p) {  in ip_input()
260 #define fragtoip(P) ((struct ip*)(((char*)(P)) + sizeof(struct qlink)))
267 static struct ip *
268 ip_reass(register struct ip *ip, register struct ipq *fp)  in ip_reass()  argument
270 	register struct mbuf *m = dtom(ip);  in ip_reass()
272 	int hlen = ip->ip_hl << 2;  in ip_reass()
276 	DEBUG_ARG("ip = %lx", (long)ip);  in ip_reass()
297 	  fp->ipq_p = ip->ip_p;  in ip_reass()
298 	  fp->ipq_id = ip->ip_id;  in ip_reass()
300 	  fp->ipq_src = ip->ip_src;  in ip_reass()
301 	  fp->ipq_dst = ip->ip_dst;  in ip_reass()
311 		if (q->ipf_off > ip->ip_off)  in ip_reass()
321 		i = pq->ipf_off + pq->ipf_len - ip->ip_off;  in ip_reass()
323 			if (i >= ip->ip_len)  in ip_reass()
325 			m_adj(dtom(ip), i);  in ip_reass()
326 			ip->ip_off += i;  in ip_reass()
327 			ip->ip_len -= i;  in ip_reass()
336             ip->ip_off + ip->ip_len > q->ipf_off) {  in ip_reass()
337 		i = (ip->ip_off + ip->ip_len) - q->ipf_off;  in ip_reass()
354 	ip_enq(iptofrag(ip), q->ipf_prev);  in ip_reass()
401     ip = fragtoip(q);  in ip_reass()
402 	ip->ip_len = next;  in ip_reass()
403 	ip->ip_tos &= ~1;  in ip_reass()
404 	ip->ip_src = fp->ipq_src;  in ip_reass()
405 	ip->ip_dst = fp->ipq_dst;  in ip_reass()
408 	m->m_len += (ip->ip_hl << 2);  in ip_reass()
409 	m->m_data -= (ip->ip_hl << 2);  in ip_reass()
411 	return ip;  in ip_reass()
503 	register struct ip *ip = mtod(m, struct ip *);  local
513 	dst = ip->ip_dst;
514 	cp = (u_char *)(ip + 1);
515 	cnt = (ip->ip_hl << 2) - sizeof (struct ip);
525 				code = &cp[IPOPT_OLEN] - (u_char *)ip;
546 				code = &cp[IPOPT_OFFSET] - (u_char *)ip;
549 			ipaddr.sin_addr = ip->ip_dst;
569 				save_rte(cp, ip->ip_src);
589 			ip->ip_dst = ipaddr.sin_addr;
596 			forward = !IN_MULTICAST(ntohl(ip->ip_dst.s_addr));
601 				code = &cp[IPOPT_OFFSET] - (u_char *)ip;
610 			bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
628 			code = cp - (u_char *)ip;
707 	struct ip *ip = mtod(m, struct ip *);
711 	olen = (ip->ip_hl<<2) - sizeof (struct ip);
712 	opts = (caddr_t)(ip + 1);
713 	i = m->m_len - (sizeof (struct ip) + olen);
717 	ip->ip_hl = sizeof(struct ip) >> 2;