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Lines Matching defs:ip

1 /* $NetBSD: ip.c,v 1.5 2022/07/08 07:02:47 skrll Exp $ */
47 #include <netinet/ip.h>
62  * sends an IP packet, if it's already constructed
65 _sendip(struct iodesc *d, struct ip *ip, size_t len)
69 	if (ip->ip_dst.s_addr == INADDR_BROADCAST || ip->ip_src.s_addr == 0 ||
70 	    netmask == 0 || SAMENET(ip->ip_src, ip->ip_dst, netmask)) {
71 		ea = arpwhohas(d, ip->ip_dst);
76 	return sendether(d, ip, len, ea, ETHERTYPE_IP);
80  * fills out the IP header
81  * Caller must leave room for ethernet, ip and udp headers in front!
87 	struct ip *ip;
89 	ip = (struct ip *)pkt - 1;
90 	len += sizeof(*ip);
92 	memset(ip, 0, sizeof(*ip));
94 	ip->ip_v = IPVERSION;
95 	ip->ip_hl = sizeof(*ip) >> 2;
96 	ip->ip_len = htons(len);
97 	ip->ip_p = proto;
98 	ip->ip_ttl = IPDEFTTL;
99 	ip->ip_src = d->myip;
100 	ip->ip_dst = d->destip;
101 	ip->ip_sum = ip_cksum(ip, sizeof(*ip));
103 	cc = _sendip(d, ip, len);
109 	return (cc - (sizeof(*ip)));
113  * reads an IP packet
114  * WARNING: the old version stripped the IP options, if there were
125 	struct ip *ip;
128 	ip = (struct ip *)pkt - 1;
130 	n = readether(d, ip, len + sizeof(*ip), tleft, &etype);
131 	if (n == -1 || (size_t)n < sizeof(*ip))
135 		struct arphdr *ah = (void *)ip;
149 	if (ip->ip_v != IPVERSION || ip->ip_p != proto) {
153 	hlen = ip->ip_hl << 2;
154 	if (hlen != sizeof(*ip) || ip_cksum(ip, hlen) != 0) {
157 	if (ntohs(ip->ip_len) < hlen) {
160 	if (n < ntohs(ip->ip_len)) {
163 	if (d->myip.s_addr && ip->ip_dst.s_addr != d->myip.s_addr) {
167 	return (ntohs(ip->ip_len) - hlen);