bsd/netinet/ip_icmp.c

88 #include <netinet/ip.h>
190  * in response to bad packet ip.
200 	struct ip *oip = mtod(n, struct ip *), *nip;
250 	if (icmplen < sizeof(struct ip)) {
291 	 * Now, copy old ip header (without options)
294 	if (m->m_data - sizeof(struct ip) < m->m_pktdat)
296 	m->m_data -= sizeof(struct ip);
297 	m->m_len += sizeof(struct ip);
300 	nip = mtod(m, struct ip *);
301 	bcopy((caddr_t)oip, (caddr_t)nip, sizeof(struct ip));
326 	struct ip *ip = mtod(m, struct ip *);
336 	icmplen = ip->ip_len;
348 		       inet_ntop(AF_INET, &ip->ip_src, buf, sizeof(buf)),
349 		       inet_ntop(AF_INET, &ip->ip_dst, ipv4str, sizeof(ipv4str)),
362 	ip = mtod(m, struct ip *);
448 		    IP_VHL_HL(icp->icmp_ip.ip_vhl) < (sizeof(struct ip) >> 2)) {
527 		switch (ip->ip_dst.s_addr) {
531 			icmpdst.sin_addr = ip->ip_src;
535 			icmpdst.sin_addr = ip->ip_dst;
550 		if (ip->ip_src.s_addr == 0) {
552 			    ip->ip_src = satosin(&ia->ia_broadaddr)->sin_addr;
554 			    ip->ip_src = satosin(&ia->ia_dstaddr)->sin_addr;
559 		ip->ip_len += hlen;	/* since ip_input deducts this */
569 			src = ntohl(ip->ip_src.s_addr);
586 		    IP_VHL_HL(icp->icmp_ip.ip_vhl) < (sizeof(struct ip) >> 2)) {
597 		icmpgw.sin_addr = ip->ip_src;
642  * Reflect the ip packet back to the source
647 	struct ip *ip = mtod(m, struct ip *);
651 	int optlen = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof(struct ip);
653 	if (!in_canforward(ip->ip_src) &&
654 	    ((ntohl(ip->ip_src.s_addr) & IN_CLASSA_NET) !=
659 	t = ip->ip_dst;
660 	ip->ip_dst = ip->ip_src;
719 	ip->ip_src = t;
720 	ip->ip_ttl = ip_defttl;
733 		cp = (u_char *) (ip + 1);
787 		ip->ip_len -= optlen;
788 		ip->ip_vhl = IP_VHL_BORING;
792 		optlen += sizeof(struct ip);
793 		bcopy((caddr_t)ip + optlen, (caddr_t)(ip + 1),
794 			 (unsigned)(m->m_len - sizeof(struct ip)));
804  * Send an icmp packet back to the ip level,
810 	struct ip *ip = mtod(m, struct ip *);
822 	hlen = IP_VHL_HL(ip->ip_vhl) << 2;
827 	icp->icmp_cksum = in_cksum(m, ip->ip_len - hlen);
839 		       inet_ntop(AF_INET, &ip->ip_dst, buf, sizeof(buf)),
840 		       inet_ntop(AF_INET, &ip->ip_src, ipv4str, sizeof(ipv4str)));
1088 	struct ip *ip;
1101 		ip = mtod(m, struct ip *);
1103 		hlen = IP_VHL_HL(ip->ip_vhl) << 2;
1109 		if (IP_VHL_V(ip->ip_vhl) != 4)
1111 		if (hlen < 20 || hlen > 40 || ip->ip_len != m->m_pkthdr.len)
1114 		if ((ip->ip_off & ~IP_DF) !=  0)
1117 		if (ip->ip_p != IPPROTO_ICMP)
1120 		if (ip->ip_src.s_addr != INADDR_ANY) {
1128 			TAILQ_FOREACH(ia, INADDR_HASH(ip->ip_src.s_addr),
1132 				    ip->ip_src.s_addr) {
1146 		ip->ip_sum = 0;