89 int	send_ip(nfd, mtu, ip, gwip, frag)  in send_ip()  argument
91 	ip_t	*ip;
128 	bcopy((char *)ip, (char *)&ipsv, sizeof(*ip));
130 	iplen = ip->ip_len;
131 	ip->ip_len = htons(iplen);
133 		if (!IP_V(ip))
134 			IP_V_A(ip, IPVERSION);
135 		if (!ip->ip_id)
136 			ip->ip_id  = htons(id++);
137 		if (!ip->ip_ttl)
138 			ip->ip_ttl = 60;
141 	if (ip->ip_src.s_addr != local_ip.s_addr) {
142 		(void) arp((char *)&ip->ip_src, (char *)A_A local_arp);
144 		local_ip = ip->ip_src;
150 		ip->ip_sum = 0;
151 		ip->ip_sum = chksum((u_short *)ip, IP_HL(ip) << 2);
153 		bcopy((char *)ip, ipbuf + sizeof(*eh), iplen);
168 		hlen = IP_HL(ip) << 2;
175 		ol = (IP_HL(ip) << 2) - sizeof(*ip);
176 		for (i = 0, s = (char*)(ip + 1); ol > 0; )
206 		s = (char *)ip + hlen;
207 		iplen = ntohs(ip->ip_len) - hlen;
208 		ip->ip_off |= htons(IP_MF);
214 				ip->ip_off ^= htons(IP_MF);
219 			ip->ip_off &= htons(0xe000);
220 			ip->ip_off |= htons(sent >> 3);
222 			ip->ip_len = htons(ts);
223 			ip->ip_sum = 0;
224 			ip->ip_sum = chksum((u_short *)ip, hlen);
225 			bcopy((char *)ip, ipbuf + sizeof(*eh), hlen);
231 			if (!(ntohs(ip->ip_off) & IP_MF))
233 			else if (!(ip->ip_off & htons(0x1fff)))
235 				hlen = i + sizeof(*ip);
236 				IP_HL_A(ip, (sizeof(*ip) + i) >> 2);
237 				bcopy(optcpy, (char *)(ip + 1), i);
242 	bcopy((char *)&ipsv, (char *)ip, sizeof(*ip));
250 int	send_tcp(nfd, mtu, ip, gwip)  in send_tcp()  argument
252 	ip_t	*ip;
261 	iplen = ip->ip_len;
262 	hlen = IP_HL(ip) << 2;
263 	t = (tcphdr_t *)((char *)ip + hlen);
264 	ip2 = (struct ip *)lbuf;
270 	ip->ip_p = IPPROTO_TCP;
271 	ip2->ip_p = ip->ip_p;
272 	ip2->ip_src = ip->ip_src;
273 	ip2->ip_dst = ip->ip_dst;
274 	bcopy((char *)ip + hlen, (char *)t2, thlen);
282 	if ((t2->th_flags == TH_SYN) && !ntohs(ip->ip_off) &&
285 		bcopy((char *)ip + hlen + thlen, (char *)ip + hlen + thlen + 4,
291 	ip->ip_len = hlen + thlen;
295 	bcopy((char *)t2, (char *)ip + hlen, thlen);
296 	return send_ip(nfd, mtu, ip, gwip, 1);
303 int	send_udp(nfd, mtu, ip, gwip)  in send_udp()  argument
305 	ip_t	*ip;
315 	ti->ti_pr = ip->ip_p;
316 	ti->ti_src = ip->ip_src;
317 	ti->ti_dst = ip->ip_dst;
318 	bcopy((char *)ip + (IP_HL(ip) << 2),
322 	ip->ip_len = (IP_HL(ip) << 2) + thlen;
327 	      (char *)ip + (IP_HL(ip) << 2), sizeof(udphdr_t));
328 	return send_ip(nfd, mtu, ip, gwip, 1);
335 int	send_icmp(nfd, mtu, ip, gwip)  in send_icmp()  argument
337 	ip_t	*ip;
342 	ic = (struct icmp *)((char *)ip + (IP_HL(ip) << 2));
347 	return send_ip(nfd, mtu, ip, gwip, 1);
351 int	send_packet(nfd, mtu, ip, gwip)  in send_packet()  argument
353 	ip_t	*ip;
356         switch (ip->ip_p)
359                 return send_tcp(nfd, mtu, ip, gwip);
361                 return send_udp(nfd, mtu, ip, gwip);
363                 return send_icmp(nfd, mtu, ip, gwip);
365                 return send_ip(nfd, mtu, ip, gwip, 1);