52 #include <netinet/ip.h>
63 	struct ip	*ipq_hdr;
79 	struct ip	*ip_hdr;
85 /* Caller must leave room for ethernet and ip headers in front!! */
90 	struct ip *ip;  in sendip()  local
98 	ip = (struct ip *)pkt - 1;  in sendip()
99 	len += sizeof(*ip);  in sendip()
101 	bzero(ip, sizeof(*ip));  in sendip()
103 	ip->ip_v = IPVERSION;			/* half-char */  in sendip()
104 	ip->ip_hl = sizeof(*ip) >> 2;		/* half-char */  in sendip()
105 	ip->ip_len = htons(len);  in sendip()
106 	ip->ip_p = proto;			/* char */  in sendip()
107 	ip->ip_ttl = IPDEFTTL;			/* char */  in sendip()
108 	ip->ip_src = d->myip;  in sendip()
109 	ip->ip_dst = d->destip;  in sendip()
110 	ip->ip_sum = in_cksum(ip, sizeof(*ip));	 /* short, but special */  in sendip()
112 	if (ip->ip_dst.s_addr == INADDR_BROADCAST || ip->ip_src.s_addr == 0 ||  in sendip()
113 	    netmask == 0 || SAMENET(ip->ip_src, ip->ip_dst, netmask))  in sendip()
114 		ea = arpwhohas(d, ip->ip_dst);  in sendip()
118 	cc = sendether(d, ip, len, ea, ETHERTYPE_IP);  in sendip()
123 	return (cc - sizeof(*ip));  in sendip()
141 ip_reasm_add(struct ip_reasm *ipr, void *pkt, struct ip *ip)  in ip_reasm_add()  argument
150 	ipq->ipq_hdr = ip;  in ip_reasm_add()
154 		off_ip = ntohs(ip->ip_off) & IP_OFFMASK;  in ip_reasm_add()
171 		 * p in queue is smaller than ip, check if we need to put  in ip_reasm_add()
172 		 * ip after p or after p->next.  in ip_reasm_add()
194  * Receive a IP packet and validate it is for us.
199 	struct ip *ip = *payload;  in readipv4()  local
209 	if (n < sizeof(*ip)) {  in readipv4()
215 	hlen = ip->ip_hl << 2;  in readipv4()
216 	if (hlen < sizeof(*ip) ||  in readipv4()
217 	    in_cksum(ip, hlen) != 0) {  in readipv4()
224 	if (n < ntohs(ip->ip_len)) {  in readipv4()
226 		       n, ntohs(ip->ip_len)));  in readipv4()
232 	fragoffset = (ntohs(ip->ip_off) & IP_OFFMASK) * 8;  in readipv4()
233 	morefrag = (ntohs(ip->ip_off) & IP_MF) == 0 ? false : true;  in readipv4()
236 	uh = (struct udphdr *)((uintptr_t)ip + sizeof(*ip));  in readipv4()
238 	if (d->myip.s_addr && ip->ip_dst.s_addr != d->myip.s_addr) {  in readipv4()
241 		    inet_ntoa(ip->ip_dst), ntohs(uh->uh_dport)));  in readipv4()
251 		    inet_ntoa(ip->ip_src), ntohs(uh->uh_sport),  in readipv4()
252 		    inet_ntoa(ip->ip_dst), ntohs(uh->uh_dport)));  in readipv4()
253 		/* If there were ip options, make them go away */  in readipv4()
254 		if (hlen != sizeof(*ip)) {  in readipv4()
255 			bcopy(((u_char *)ip) + hlen, uh,  in readipv4()
257 			ip->ip_len = htons(sizeof(*ip));  in readipv4()
258 			n -= hlen - sizeof(*ip);  in readipv4()
261 		n = (n > (ntohs(ip->ip_len) - sizeof(*ip))) ?  in readipv4()
262 		    ntohs(ip->ip_len) - sizeof(*ip) : n;  in readipv4()
264 		*payload = (void *)((uintptr_t)ip + sizeof(*ip));  in readipv4()
269 		if (ipr->ip_src.s_addr == ip->ip_src.s_addr &&  in readipv4()
270 		    ipr->ip_dst.s_addr == ip->ip_dst.s_addr &&  in readipv4()
271 		    ipr->ip_id == ip->ip_id &&  in readipv4()
272 		    ipr->ip_proto == ip->ip_p)  in readipv4()
283 		ipr->ip_src = ip->ip_src;  in readipv4()
284 		ipr->ip_dst = ip->ip_dst;  in readipv4()
285 		ipr->ip_id = ip->ip_id;  in readipv4()
286 		ipr->ip_proto = ip->ip_p;  in readipv4()
291 		    __func__, ntohs(ip->ip_id), inet_ntoa(ip->ip_src),  in readipv4()
292 		    inet_ntoa(ip->ip_dst)));  in readipv4()
299 	if (!ip_reasm_add(ipr, ptr, ip)) {  in readipv4()
343 	ipr->ip_total_size = n + sizeof(*ip) + sizeof(struct ether_header);  in readipv4()
356 	/* Fabricate IP header */  in readipv4()
357 	ipr->ip_hdr = (struct ip *)((uintptr_t)eh + sizeof(*eh));  in readipv4()
388 	    __func__, ntohs(ip->ip_id), inet_ntoa(ip->ip_src),  in readipv4()
389 	    inet_ntoa(ip->ip_dst)));  in readipv4()
394  * Receive a IP packet.
433 			struct ip *ip = data;  in readip()  local
435 			if (ip->ip_v == IPVERSION &&	/* half char */  in readip()
436 			    ip->ip_p == proto) {  in readip()
452 			DEBUG_PRINTF(1, ("%s: IP version or proto. "  in readip()
454 			    __func__, ip->ip_v, ip->ip_p));  in readip()