1994-10-28 15:09:49 +00:00
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/*
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* Copyright (c) 1993 Daniel Boulet
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* Copyright (c) 1994 Ugen J.S.Antsilevich
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*
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* Redistribution and use in source forms, with and without modification,
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* are permitted provided that this entire comment appears intact.
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*
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* Redistribution in binary form may occur without any restrictions.
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* Obviously, it would be nice if you gave credit where credit is due
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* but requiring it would be too onerous.
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*
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* This software is provided ``AS IS'' without any warranties of any kind.
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*/
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/*
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* Implement IP packet firewall
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/domain.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/errno.h>
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1994-11-16 10:17:11 +00:00
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#include <sys/time.h>
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1994-10-28 15:09:49 +00:00
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#include <sys/kernel.h>
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#include <net/if.h>
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#include <net/route.h>
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1994-11-16 10:17:11 +00:00
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1994-10-28 15:09:49 +00:00
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_icmp.h>
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1994-11-16 10:17:11 +00:00
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#include <arpa/inet.h>
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1994-10-28 15:09:49 +00:00
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#include <netinet/ip_fw.h>
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1994-11-16 10:17:11 +00:00
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#ifdef IPFIREWALL
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1994-11-08 12:47:29 +00:00
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struct ip_fw *ip_fw_fwd_chain;
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struct ip_fw *ip_fw_blk_chain;
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1994-10-28 15:09:49 +00:00
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int ip_fw_policy=1;
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1994-11-16 10:17:11 +00:00
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#endif
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#ifdef IPACCT
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struct ip_fw *ip_acct_chain;
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#endif
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1994-10-28 15:09:49 +00:00
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inline
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void
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print_ip(xaddr)
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struct in_addr xaddr;
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{
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u_long addr = ntohl(xaddr.s_addr);
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printf("%d.%d.%d.%d",(addr>>24) & 0xff,
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(addr>>16)&0xff,
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(addr>>8)&0xff,
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addr&0xFF);
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}
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/*
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* Returns 1 if the port is matched by the vector, 0 otherwise
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*/
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inline
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int port_match(portptr,nports,port,range_flag)
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u_short *portptr;
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int nports;
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u_short port;
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int range_flag;
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{
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1994-11-16 10:17:11 +00:00
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if (!nports)
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return 1;
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1994-10-28 15:09:49 +00:00
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if ( range_flag ) {
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if ( portptr[0] <= port && port <= portptr[1] ) {
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return( 1 );
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}
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nports -= 2;
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portptr += 2;
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}
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while ( nports-- > 0 ) {
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if ( *portptr++ == port ) {
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return( 1 );
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}
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}
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return(0);
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}
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/*
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1994-11-08 12:47:29 +00:00
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* Returns 0 if packet should be dropped, 1 or more if it should be accepted
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1994-10-28 15:09:49 +00:00
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*/
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1994-11-16 10:17:11 +00:00
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#ifdef IPFIREWALL
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1994-11-08 12:47:29 +00:00
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int ip_fw_chk(ip,chain)
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1994-10-28 15:09:49 +00:00
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struct ip *ip;
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1994-11-08 12:47:29 +00:00
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struct ip_fw *chain;
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1994-10-28 15:09:49 +00:00
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{
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struct in_addr src, dst;
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1994-11-16 10:17:11 +00:00
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char got_proto=0;
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int frwl_proto, proto=0;
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register struct ip_fw *f;
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u_short src_port=0, dst_port=0;
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u_short *portptr=(u_short *)&(((u_int *)ip)[ip->ip_hl]);
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if (!chain) {
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return(1); /* If no chain , always say Ok to packet */
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1994-10-28 15:09:49 +00:00
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}
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src = ip->ip_src;
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dst = ip->ip_dst;
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#ifdef DEBUG_IPFIREWALL
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{
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printf("packet ");
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switch(ip->ip_p) {
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1994-11-16 10:17:11 +00:00
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case IPPROTO_TCP:
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printf("TCP ");
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break;
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case IPPROTO_UDP:
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printf("UDP ");
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break;
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case IPPROTO_ICMP:
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printf("ICMP:%d ",((char *)portptr)[0]&0xff);
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break;
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default:
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printf("p=%d ",ip->ip_p);
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break;
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1994-10-28 15:09:49 +00:00
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}
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print_ip(ip->ip_src);
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1994-11-16 10:17:11 +00:00
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if (ip->ip_p==IPPROTO_TCP || ip->ip_p==IPPROTO_UDP) {
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1994-10-28 15:09:49 +00:00
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printf(":%d ",ntohs(portptr[0]));
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}
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print_ip(ip->ip_dst);
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1994-11-16 10:17:11 +00:00
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if ( ip->ip_p==IPPROTO_TCP || ip->ip_p==IPPROTO_UDP) {
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1994-10-28 15:09:49 +00:00
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printf(":%d ",ntohs(portptr[1]));
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}
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printf("\n");
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}
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#endif
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1994-11-16 10:17:11 +00:00
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for (f=chain;f;f=f->next)
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if ((src.s_addr&f->src_mask.s_addr)==f->src.s_addr
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&& (dst.s_addr&f->dst_mask.s_addr)==f->dst.s_addr) {
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frwl_proto=f->flags&IP_FW_F_KIND;
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if (frwl_proto==IP_FW_F_ALL) {
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/* Universal frwl - we've got a match! */
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1994-10-28 15:09:49 +00:00
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#ifdef DEBUG_IPFIREWALL
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1994-11-08 12:47:29 +00:00
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printf("universal frwl match\n");
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1994-10-28 15:09:49 +00:00
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#endif
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1994-10-31 23:58:04 +00:00
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#ifdef IPFIREWALL_VERBOSE
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1994-11-16 10:17:11 +00:00
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if (!(f->flags & IP_FW_F_ACCEPT))
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goto bad_packet;
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return 1;
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#else
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return( f->flags & IP_FW_F_ACCEPT );
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1994-10-28 15:09:49 +00:00
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#endif
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} else {
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1994-11-16 10:17:11 +00:00
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/*
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* Specific firewall - packet's
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* protocol must match firewall's
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*/
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if (!got_proto) {
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/*
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* We still had not determined the protocol
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* of this packet,now the time to do so.
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*/
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switch(ip->ip_p) {
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case IPPROTO_TCP:
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/*
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* First two shorts in TCP are src/dst ports
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*/
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proto=IP_FW_F_TCP;
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src_port=ntohs(portptr[0]);
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dst_port=ntohs(portptr[1]);
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break;
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case IPPROTO_UDP:
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/*
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* First two shorts in UDP are src/dst ports
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*/
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proto = IP_FW_F_UDP;
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src_port = ntohs(portptr[0]);
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dst_port = ntohs(portptr[1]);
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break;
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1994-10-28 15:09:49 +00:00
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case IPPROTO_ICMP:
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1994-11-16 10:17:11 +00:00
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proto=IP_FW_F_ICMP;
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break;
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default:
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proto=IP_FW_F_ALL;
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1994-10-28 15:09:49 +00:00
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#ifdef DEBUG_IPFIREWALL
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1994-11-16 10:17:11 +00:00
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printf("non TCP/UDP packet\n");
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1994-10-28 15:09:49 +00:00
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#endif
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1994-11-16 10:17:11 +00:00
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}
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got_proto=1;
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}
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/*
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* At this moment we surely know the protocol of this
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* packet and we'll check if it matches,then proceed futher..
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*/
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if (proto==frwl_proto) {
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if (proto==IP_FW_F_ICMP ||
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(port_match(&f->ports[0],f->n_src_p,src_port,
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f->flags&IP_FW_F_SRNG) &&
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port_match(&f->ports[f->n_src_p],f->n_dst_p,dst_port,
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f->flags&IP_FW_F_DRNG))) {
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#ifdef IPFIREWALL_VERBOSE
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if (!(f->flags & IP_FW_F_ACCEPT))
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goto bad_packet;
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return 1;
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#else
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return( f->flags & IP_FW_F_ACCEPT);
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#endif
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} /* Ports match */
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} /* Proto matches */
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} /* ALL/Specific */
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} /* IP addr/mask matches */
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1994-10-28 15:09:49 +00:00
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1994-11-16 10:17:11 +00:00
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/*
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* If we get here then none of the firewalls matched.
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* So now we relay on policy defined by user-unmatched packet can
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* be ever accepted or rejected...
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*/
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#ifdef IPFIREWALL_VERBOSE
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if (!(ip_fw_policy))
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goto bad_packet;
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return 1;
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#else
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return(ip_fw_policy);
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#endif
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1994-10-28 15:09:49 +00:00
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1994-10-31 23:58:04 +00:00
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#ifdef IPFIREWALL_VERBOSE
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1994-11-16 10:17:11 +00:00
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bad_packet:
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1994-11-08 12:47:29 +00:00
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/*
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* VERY ugly piece of code which actually
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1994-11-16 10:17:11 +00:00
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* makes kernel printf for denied packets...
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1994-11-08 12:47:29 +00:00
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*/
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1994-11-16 10:17:11 +00:00
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if (f->flags&IP_FW_F_PRN) {
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1994-11-08 12:47:29 +00:00
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printf("ip_fw_chk says no to ");
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1994-10-31 23:58:04 +00:00
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switch(ip->ip_p) {
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1994-11-16 10:17:11 +00:00
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case IPPROTO_TCP:
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printf("TCP ");
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break;
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case IPPROTO_UDP:
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printf("UDP ");
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break;
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case IPPROTO_ICMP:
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printf("ICMP:%d ",((char *)portptr)[0]&0xff);
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break;
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default:
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printf("p=%d ",ip->ip_p);
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break;
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1994-10-31 23:58:04 +00:00
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}
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print_ip(ip->ip_src);
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1994-11-16 10:17:11 +00:00
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if (ip->ip_p==IPPROTO_TCP || ip->ip_p==IPPROTO_UDP) {
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1994-10-31 23:58:04 +00:00
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printf(":%d ",ntohs(portptr[0]));
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} else {
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printf("\n");
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}
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print_ip(ip->ip_dst);
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if ( ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP ) {
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printf(":%d ",ntohs(portptr[1]));
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}
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printf("\n");
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}
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1994-11-16 10:17:11 +00:00
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return(0);
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1994-10-28 15:09:49 +00:00
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#endif
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1994-11-16 10:17:11 +00:00
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}
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#endif /* IPFIREWALL */
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1994-10-28 15:09:49 +00:00
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1994-11-16 10:17:11 +00:00
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#ifdef IPACCT
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void ip_acct_cnt(ip,chain,nh_conv)
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struct ip *ip;
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struct ip_fw *chain;
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int nh_conv;
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{
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struct in_addr src, dst;
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char got_proto=0,rev=0;
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int frwl_proto, proto=0;
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register struct ip_fw *f;
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u_short src_port=0, dst_port=0;
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u_short *portptr=(u_short *)&(((u_int *)ip)[ip->ip_hl]);
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1994-10-28 15:09:49 +00:00
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1994-11-16 10:17:11 +00:00
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if (!chain)
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return;
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1994-10-28 15:09:49 +00:00
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1994-11-16 10:17:11 +00:00
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src = ip->ip_src;
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dst = ip->ip_dst;
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for (f=chain;f;f=f->next) {
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if ((src.s_addr&f->src_mask.s_addr)==f->src.s_addr
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&& (dst.s_addr&f->dst_mask.s_addr)==f->dst.s_addr) {
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rev=0;
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goto addr_match;
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}
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if ((f->flags&IP_FW_F_BIDIR) &&
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((src.s_addr&f->src_mask.s_addr)==f->dst.s_addr
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&& (dst.s_addr&f->dst_mask.s_addr)==f->src.s_addr)) {
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rev=1;
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goto addr_match;
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}
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continue;
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addr_match:
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frwl_proto=f->flags&IP_FW_F_KIND;
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if (frwl_proto==IP_FW_F_ALL) {
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/* Universal frwl - we've got a match! */
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f->p_cnt++; /* Rise packet count */
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/*
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* Rise byte count,
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* if need to convert from
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* host to network byte
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* order,do it.
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*/
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if (nh_conv)
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f->b_cnt+=ntohs(ip->ip_len);
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else
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f->b_cnt+=ip->ip_len;
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} else {
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|
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/*
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|
|
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* Specific firewall - packet's
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|
* protocol must match firewall's
|
|
|
|
*/
|
|
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if (!got_proto) {
|
1994-11-08 12:47:29 +00:00
|
|
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/*
|
1994-11-16 10:17:11 +00:00
|
|
|
* We still had not determined the protocol
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|
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* of this packet,now the time to do so.
|
1994-11-08 12:47:29 +00:00
|
|
|
*/
|
1994-11-16 10:17:11 +00:00
|
|
|
switch(ip->ip_p) {
|
|
|
|
case IPPROTO_TCP:
|
|
|
|
/*
|
|
|
|
* First two shorts in TCP are src/dst ports
|
|
|
|
*/
|
|
|
|
proto=IP_FW_F_TCP;
|
|
|
|
src_port=ntohs(portptr[0]);
|
|
|
|
dst_port=ntohs(portptr[1]);
|
|
|
|
break;
|
|
|
|
case IPPROTO_UDP:
|
|
|
|
/*
|
|
|
|
* First two shorts in UDP are src/dst ports
|
|
|
|
*/
|
|
|
|
proto = IP_FW_F_UDP;
|
|
|
|
src_port = ntohs(portptr[0]);
|
|
|
|
dst_port = ntohs(portptr[1]);
|
|
|
|
break;
|
|
|
|
case IPPROTO_ICMP:
|
|
|
|
proto=IP_FW_F_ICMP;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
proto=IP_FW_F_ALL;
|
|
|
|
}
|
|
|
|
got_proto=1;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* At this moment we surely know the protocol of this
|
|
|
|
* packet and we'll check if it matches,then proceed futher..
|
|
|
|
*/
|
|
|
|
if (proto==frwl_proto) {
|
|
|
|
|
|
|
|
if ((proto==IP_FW_F_ICMP ||
|
|
|
|
(port_match(&f->ports[0],f->n_src_p,src_port,
|
|
|
|
f->flags&IP_FW_F_SRNG) &&
|
|
|
|
port_match(&f->ports[f->n_src_p],f->n_dst_p,dst_port,
|
|
|
|
f->flags&IP_FW_F_DRNG)))
|
|
|
|
|| ((rev)
|
|
|
|
&& (port_match(&f->ports[0],f->n_src_p,dst_port,
|
|
|
|
f->flags&IP_FW_F_SRNG)
|
|
|
|
&& port_match(&f->ports[f->n_src_p],f->n_dst_p,src_port,
|
|
|
|
f->flags&IP_FW_F_DRNG))))
|
|
|
|
{
|
|
|
|
f->p_cnt++; /* Rise packet count */
|
|
|
|
/*
|
|
|
|
* Rise byte count,
|
|
|
|
* if need to convert from
|
|
|
|
* host to network byte
|
|
|
|
* order,do it.
|
|
|
|
*/
|
|
|
|
if (nh_conv)
|
|
|
|
f->b_cnt+=ntohs(ip->ip_len);
|
|
|
|
else
|
|
|
|
f->b_cnt+=ip->ip_len;
|
|
|
|
} /* Ports match */
|
|
|
|
} /* Proto matches */
|
|
|
|
} /* ALL/Specific */
|
|
|
|
} /* IP addr/mask matches */
|
|
|
|
} /* End of whole function */
|
|
|
|
#endif /* IPACCT */
|
1994-10-28 15:09:49 +00:00
|
|
|
|
1994-11-16 10:17:11 +00:00
|
|
|
static
|
|
|
|
void
|
|
|
|
zero_fw_chain(chainptr)
|
|
|
|
struct ip_fw *chainptr;
|
|
|
|
{
|
|
|
|
struct ip_fw *ctmp=chainptr;
|
|
|
|
while(ctmp) {
|
|
|
|
ctmp->p_cnt=0l;
|
|
|
|
ctmp->b_cnt=0l;
|
|
|
|
ctmp=ctmp->next;
|
|
|
|
}
|
1994-10-28 15:09:49 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static
|
|
|
|
void
|
1994-11-08 12:47:29 +00:00
|
|
|
free_fw_chain(chainptr)
|
|
|
|
struct ip_fw **chainptr;
|
1994-10-28 15:09:49 +00:00
|
|
|
{
|
1994-11-07 10:01:32 +00:00
|
|
|
int s=splnet();
|
1994-10-28 15:09:49 +00:00
|
|
|
while ( *chainptr != NULL ) {
|
1994-11-08 12:47:29 +00:00
|
|
|
struct ip_fw *ftmp;
|
1994-10-28 15:09:49 +00:00
|
|
|
ftmp = *chainptr;
|
|
|
|
*chainptr = ftmp->next;
|
|
|
|
free(ftmp,M_SOOPTS);
|
|
|
|
}
|
1994-11-07 10:01:32 +00:00
|
|
|
splx(s);
|
1994-10-28 15:09:49 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static
|
|
|
|
int
|
1994-11-07 10:01:32 +00:00
|
|
|
add_to_chain(chainptr,frwl)
|
|
|
|
struct ip_fw **chainptr;
|
|
|
|
struct ip_fw *frwl;
|
1994-10-28 15:09:49 +00:00
|
|
|
{
|
1994-11-07 10:01:32 +00:00
|
|
|
struct ip_fw *ftmp;
|
|
|
|
struct ip_fw *chtmp=NULL;
|
|
|
|
struct ip_fw *chtmp_prev=NULL;
|
|
|
|
int s=splnet();
|
1994-10-31 23:58:04 +00:00
|
|
|
u_long m_src_mask,m_dst_mask;
|
|
|
|
u_long n_sa,n_da,o_sa,o_da,o_sm,o_dm,n_sm,n_dm;
|
1994-11-07 10:01:32 +00:00
|
|
|
u_short n_sr,n_dr,o_sr,o_dr;
|
1994-10-31 23:58:04 +00:00
|
|
|
u_short oldkind,newkind;
|
|
|
|
int addb4=0;
|
|
|
|
int n_o,n_n;
|
1994-10-28 15:09:49 +00:00
|
|
|
|
1994-11-07 10:01:32 +00:00
|
|
|
ftmp = malloc( sizeof(struct ip_fw), M_SOOPTS, M_DONTWAIT );
|
1994-10-28 15:09:49 +00:00
|
|
|
if ( ftmp == NULL ) {
|
1994-11-07 10:01:32 +00:00
|
|
|
#ifdef DEBUG_IPFIREWALL
|
|
|
|
printf("ip_fw_ctl: malloc said no\n");
|
|
|
|
#endif
|
|
|
|
splx(s);
|
1994-10-28 15:09:49 +00:00
|
|
|
return( ENOSPC );
|
|
|
|
}
|
|
|
|
|
1994-11-07 10:01:32 +00:00
|
|
|
bcopy( frwl, ftmp, sizeof( struct ip_fw ) );
|
1994-11-16 10:17:11 +00:00
|
|
|
ftmp->p_cnt=0L;
|
|
|
|
ftmp->b_cnt=0L;
|
|
|
|
|
1994-10-28 15:09:49 +00:00
|
|
|
ftmp->next = NULL;
|
|
|
|
|
|
|
|
if (*chainptr==NULL)
|
|
|
|
{
|
|
|
|
*chainptr=ftmp;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
1994-11-07 10:01:32 +00:00
|
|
|
chtmp_prev=NULL;
|
|
|
|
for (chtmp=*chainptr;chtmp!=NULL;chtmp=chtmp->next) {
|
1994-10-31 23:58:04 +00:00
|
|
|
|
|
|
|
addb4=0;
|
|
|
|
|
1994-11-07 10:01:32 +00:00
|
|
|
newkind=ftmp->flags & IP_FW_F_KIND;
|
|
|
|
oldkind=chtmp->flags & IP_FW_F_KIND;
|
1994-10-31 23:58:04 +00:00
|
|
|
|
1994-11-07 10:01:32 +00:00
|
|
|
if (newkind!=IP_FW_F_ALL
|
|
|
|
&& oldkind!=IP_FW_F_ALL
|
1994-11-16 10:17:11 +00:00
|
|
|
&& oldkind!=newkind) {
|
|
|
|
chtmp_prev=chtmp;
|
|
|
|
continue;
|
|
|
|
}
|
1994-10-31 23:58:04 +00:00
|
|
|
/*
|
|
|
|
* Very very *UGLY* code...
|
|
|
|
* Sorry,but i had to do this....
|
|
|
|
*/
|
|
|
|
n_sa=ntohl(ftmp->src.s_addr);
|
|
|
|
n_da=ntohl(ftmp->dst.s_addr);
|
|
|
|
n_sm=ntohl(ftmp->src_mask.s_addr);
|
|
|
|
n_dm=ntohl(ftmp->dst_mask.s_addr);
|
|
|
|
|
1994-11-07 10:01:32 +00:00
|
|
|
o_sa=ntohl(chtmp->src.s_addr);
|
|
|
|
o_da=ntohl(chtmp->dst.s_addr);
|
|
|
|
o_sm=ntohl(chtmp->src_mask.s_addr);
|
|
|
|
o_dm=ntohl(chtmp->dst_mask.s_addr);
|
1994-10-31 23:58:04 +00:00
|
|
|
|
|
|
|
m_src_mask = o_sm & n_sm;
|
|
|
|
m_dst_mask = o_dm & n_dm;
|
|
|
|
|
|
|
|
if ((o_sa & m_src_mask) == (n_sa & m_src_mask)) {
|
|
|
|
if (n_sm > o_sm)
|
|
|
|
addb4++;
|
|
|
|
if (n_sm < o_sm)
|
|
|
|
addb4--;
|
|
|
|
}
|
|
|
|
|
|
|
|
if ((o_da & m_dst_mask) == (n_da & m_dst_mask)) {
|
|
|
|
if (n_dm > o_dm)
|
|
|
|
addb4++;
|
|
|
|
if (n_dm < o_dm)
|
|
|
|
addb4--;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (((o_da & o_dm) == (n_da & n_dm))
|
|
|
|
&&((o_sa & o_sm) == (n_sa & n_sm)))
|
|
|
|
{
|
1994-11-07 10:01:32 +00:00
|
|
|
if (newkind!=IP_FW_F_ALL &&
|
|
|
|
oldkind==IP_FW_F_ALL)
|
1994-10-31 23:58:04 +00:00
|
|
|
addb4++;
|
1994-11-07 10:01:32 +00:00
|
|
|
if (newkind==oldkind && (oldkind==IP_FW_F_TCP
|
|
|
|
|| oldkind==IP_FW_F_UDP)) {
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Here the main ide is to check the size
|
|
|
|
* of port range which the frwl covers
|
|
|
|
* We actually don't check their values but
|
|
|
|
* just the wideness of range they have
|
|
|
|
* so that less wide ranges or single ports
|
|
|
|
* go first and wide ranges go later. No ports
|
|
|
|
* at all treated as a range of maximum number
|
|
|
|
* of ports.
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (ftmp->flags & IP_FW_F_SRNG)
|
|
|
|
n_sr=ftmp->ports[1]-ftmp->ports[0];
|
|
|
|
else
|
|
|
|
n_sr=(ftmp->n_src_p)?
|
|
|
|
ftmp->n_src_p : USHRT_MAX;
|
|
|
|
|
|
|
|
if (chtmp->flags & IP_FW_F_SRNG)
|
|
|
|
o_sr=chtmp->ports[1]-chtmp->ports[0];
|
|
|
|
else
|
|
|
|
o_sr=(chtmp->n_src_p)?
|
|
|
|
chtmp->n_src_p : USHRT_MAX;
|
|
|
|
|
|
|
|
if (n_sr<o_sr)
|
1994-10-31 23:58:04 +00:00
|
|
|
addb4++;
|
1994-11-07 10:01:32 +00:00
|
|
|
if (n_sr>o_sr)
|
|
|
|
addb4--;
|
|
|
|
|
|
|
|
n_n=ftmp->n_src_p;
|
|
|
|
n_o=chtmp->n_src_p;
|
1994-10-31 23:58:04 +00:00
|
|
|
/*
|
1994-11-07 10:01:32 +00:00
|
|
|
* Actually this cannot happen as the frwl control
|
1994-10-31 23:58:04 +00:00
|
|
|
* procedure checks for number of ports in source and
|
|
|
|
* destination range but we will try to be more safe.
|
|
|
|
*/
|
1994-11-07 10:01:32 +00:00
|
|
|
if ((n_n>(IP_FW_MAX_PORTS-2)) ||
|
|
|
|
(n_o>(IP_FW_MAX_PORTS-2)))
|
|
|
|
goto skip_check;
|
|
|
|
|
|
|
|
if (ftmp->flags & IP_FW_F_DRNG)
|
|
|
|
n_dr=ftmp->ports[n_n+1]-ftmp->ports[n_n];
|
|
|
|
else
|
|
|
|
n_dr=(ftmp->n_dst_p)?
|
|
|
|
ftmp->n_dst_p : USHRT_MAX;
|
|
|
|
|
|
|
|
if (chtmp->flags & IP_FW_F_DRNG)
|
1994-11-16 10:17:11 +00:00
|
|
|
o_dr=chtmp->ports[n_o+1]-chtmp->ports[n_o];
|
1994-11-07 10:01:32 +00:00
|
|
|
else
|
|
|
|
o_dr=(chtmp->n_dst_p)?
|
|
|
|
chtmp->n_dst_p : USHRT_MAX;
|
|
|
|
if (n_dr<o_dr)
|
|
|
|
addb4++;
|
|
|
|
if (n_dr>o_dr)
|
|
|
|
addb4--;
|
|
|
|
|
|
|
|
skip_check:
|
1994-10-31 23:58:04 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
if (addb4>0) {
|
1994-11-07 10:01:32 +00:00
|
|
|
if (chtmp_prev) {
|
|
|
|
chtmp_prev->next=ftmp;
|
|
|
|
ftmp->next=chtmp;
|
1994-10-31 23:58:04 +00:00
|
|
|
} else {
|
|
|
|
*chainptr=ftmp;
|
1994-11-07 10:01:32 +00:00
|
|
|
ftmp->next=chtmp;
|
1994-10-31 23:58:04 +00:00
|
|
|
}
|
1994-11-07 10:01:32 +00:00
|
|
|
splx(s);
|
1994-10-31 23:58:04 +00:00
|
|
|
return 0;
|
|
|
|
}
|
1994-11-07 10:01:32 +00:00
|
|
|
chtmp_prev=chtmp;
|
1994-10-31 23:58:04 +00:00
|
|
|
}
|
1994-11-07 10:01:32 +00:00
|
|
|
if (chtmp_prev)
|
|
|
|
chtmp_prev->next=ftmp;
|
1994-10-31 23:58:04 +00:00
|
|
|
else
|
|
|
|
#define wrong
|
|
|
|
#ifdef wrong
|
|
|
|
*chainptr=ftmp;
|
1994-10-28 15:09:49 +00:00
|
|
|
#else
|
1994-10-31 23:58:04 +00:00
|
|
|
panic("Can't happen");
|
1994-10-28 15:09:49 +00:00
|
|
|
#endif
|
1994-10-31 23:58:04 +00:00
|
|
|
#undef wrong
|
1994-10-28 15:09:49 +00:00
|
|
|
}
|
1994-11-07 10:01:32 +00:00
|
|
|
splx(s);
|
1994-10-28 15:09:49 +00:00
|
|
|
return(0);
|
|
|
|
}
|
|
|
|
|
|
|
|
static
|
|
|
|
int
|
1994-11-08 12:47:29 +00:00
|
|
|
del_from_chain(chainptr,frwl)
|
|
|
|
struct ip_fw **chainptr;
|
|
|
|
struct ip_fw *frwl;
|
1994-10-28 15:09:49 +00:00
|
|
|
{
|
1994-11-08 12:47:29 +00:00
|
|
|
struct ip_fw *ftmp,*ltmp;
|
1994-10-28 15:09:49 +00:00
|
|
|
u_short tport1,tport2,tmpnum;
|
|
|
|
char matches,was_found;
|
1994-11-08 12:47:29 +00:00
|
|
|
int s=splnet();
|
1994-10-28 15:09:49 +00:00
|
|
|
|
|
|
|
ftmp=*chainptr;
|
|
|
|
|
|
|
|
if ( ftmp == NULL ) {
|
1994-11-08 12:47:29 +00:00
|
|
|
#ifdef DEBUG_IPFIREWALL
|
|
|
|
printf("ip_fw_ctl: chain is empty\n");
|
|
|
|
#endif
|
1994-11-07 10:01:32 +00:00
|
|
|
splx(s);
|
1994-10-28 15:09:49 +00:00
|
|
|
return( EINVAL );
|
1994-11-08 12:47:29 +00:00
|
|
|
}
|
1994-10-28 15:09:49 +00:00
|
|
|
|
|
|
|
ltmp=NULL;
|
|
|
|
was_found=0;
|
|
|
|
|
|
|
|
while( ftmp != NULL )
|
|
|
|
{
|
|
|
|
matches=1;
|
1994-11-08 12:47:29 +00:00
|
|
|
if ((bcmp(&ftmp->src,&frwl->src,sizeof(struct in_addr)))
|
|
|
|
|| (bcmp(&ftmp->src_mask,&frwl->src_mask,sizeof(struct in_addr)))
|
|
|
|
|| (bcmp(&ftmp->dst,&frwl->dst,sizeof(struct in_addr)))
|
|
|
|
|| (bcmp(&ftmp->dst_mask,&frwl->dst_mask,sizeof(struct in_addr)))
|
|
|
|
|| (ftmp->flags!=frwl->flags))
|
1994-10-28 15:09:49 +00:00
|
|
|
matches=0;
|
1994-11-08 12:47:29 +00:00
|
|
|
tport1=ftmp->n_src_p+ftmp->n_dst_p;
|
|
|
|
tport2=frwl->n_src_p+frwl->n_dst_p;
|
1994-10-28 15:09:49 +00:00
|
|
|
if (tport1!=tport2)
|
|
|
|
matches=0;
|
|
|
|
else
|
|
|
|
if (tport1!=0)
|
|
|
|
{
|
1994-11-08 12:47:29 +00:00
|
|
|
for (tmpnum=0;tmpnum < tport1 && tmpnum < IP_FW_MAX_PORTS;tmpnum++)
|
|
|
|
if (ftmp->ports[tmpnum]!=frwl->ports[tmpnum])
|
1994-10-28 15:09:49 +00:00
|
|
|
matches=0;
|
|
|
|
}
|
|
|
|
if(matches)
|
|
|
|
{
|
|
|
|
was_found=1;
|
|
|
|
if (ltmp)
|
|
|
|
{
|
|
|
|
ltmp->next=ftmp->next;
|
|
|
|
free(ftmp,M_SOOPTS);
|
|
|
|
ftmp=ltmp->next;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
*chainptr=ftmp->next;
|
|
|
|
free(ftmp,M_SOOPTS);
|
|
|
|
ftmp=*chainptr;
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
ltmp = ftmp;
|
|
|
|
ftmp = ftmp->next;
|
|
|
|
}
|
|
|
|
}
|
1994-11-07 10:01:32 +00:00
|
|
|
splx(s);
|
1994-10-28 15:09:49 +00:00
|
|
|
if (was_found) return 0;
|
|
|
|
else return(EINVAL);
|
|
|
|
}
|
|
|
|
|
1994-11-16 10:17:11 +00:00
|
|
|
struct ip_fw *
|
|
|
|
check_ipfw_struct(m)
|
|
|
|
struct mbuf *m;
|
|
|
|
{
|
|
|
|
struct ip_fw *frwl;
|
|
|
|
|
|
|
|
if ( m->m_len != sizeof(struct ip_fw) ) {
|
|
|
|
#ifdef DEBUG_IPFIREWALL
|
|
|
|
printf("ip_fw_ctl: len=%d, want %d\n",m->m_len,
|
|
|
|
sizeof(struct ip_fw));
|
|
|
|
#endif
|
|
|
|
return(NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
frwl = mtod(m,struct ip_fw*);
|
|
|
|
|
|
|
|
if ( (frwl->flags & ~IP_FW_F_MASK) != 0 ) {
|
|
|
|
#ifdef DEBUG_IPFIREWALL
|
|
|
|
printf("ip_fw_ctl: undefined flag bits set (flags=%x)\n",
|
|
|
|
frwl->flags);
|
|
|
|
#endif
|
|
|
|
return(NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
if ( (frwl->flags & IP_FW_F_SRNG) && frwl->n_src_p < 2 ) {
|
|
|
|
#ifdef DEBUG_IPFIREWALL
|
|
|
|
printf("ip_fw_ctl: src range set but n_src_p=%d\n",
|
|
|
|
frwl->n_src_p);
|
|
|
|
#endif
|
|
|
|
return(NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
if ( (frwl->flags & IP_FW_F_DRNG) && frwl->n_dst_p < 2 ) {
|
|
|
|
#ifdef DEBUG_IPFIREWALL
|
|
|
|
printf("ip_fw_ctl: dst range set but n_dst_p=%d\n",
|
|
|
|
frwl->n_dst_p);
|
|
|
|
#endif
|
|
|
|
return(NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
if ( frwl->n_src_p + frwl->n_dst_p > IP_FW_MAX_PORTS ) {
|
|
|
|
#ifdef DEBUG_IPFIREWALL
|
|
|
|
printf("ip_fw_ctl: too many ports (%d+%d)\n",
|
|
|
|
frwl->n_src_p,frwl->n_dst_p);
|
|
|
|
#endif
|
|
|
|
return(NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
#if 0
|
|
|
|
if ( (frwl->flags & IP_FW_F_KIND) == IP_FW_F_ICMP ) {
|
|
|
|
#ifdef DEBUG_IPFIREWALL
|
|
|
|
printf("ip_fw_ctl: request for unsupported ICMP frwling\n");
|
|
|
|
#endif
|
|
|
|
return(NULL);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
return frwl;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
#ifdef IPACCT
|
|
|
|
int
|
|
|
|
ip_acct_ctl(stage,m)
|
|
|
|
int stage;
|
|
|
|
struct mbuf *m;
|
|
|
|
{
|
|
|
|
if ( stage == IP_ACCT_FLUSH )
|
|
|
|
{
|
|
|
|
free_fw_chain(&ip_acct_chain);
|
|
|
|
return(0);
|
|
|
|
}
|
|
|
|
if ( stage == IP_ACCT_ZERO )
|
|
|
|
{
|
|
|
|
zero_fw_chain(ip_acct_chain);
|
|
|
|
return(0);
|
|
|
|
}
|
|
|
|
if ( stage == IP_ACCT_ADD
|
|
|
|
|| stage == IP_ACCT_DEL
|
|
|
|
) {
|
|
|
|
|
|
|
|
struct ip_fw *frwl;
|
|
|
|
|
|
|
|
if (!(frwl=check_ipfw_struct(m)))
|
|
|
|
return (EINVAL);
|
|
|
|
|
|
|
|
switch (stage) {
|
|
|
|
case IP_ACCT_ADD:
|
|
|
|
return( add_to_chain(&ip_acct_chain,frwl));
|
|
|
|
case IP_ACCT_DEL:
|
|
|
|
return( del_from_chain(&ip_acct_chain,frwl));
|
|
|
|
default:
|
|
|
|
/*
|
|
|
|
* Should be panic but...
|
|
|
|
*/
|
|
|
|
#ifdef DEBUG_IPFIREWALL
|
|
|
|
printf("ip_acct_ctl: unknown request %d\n",stage);
|
|
|
|
#endif
|
|
|
|
return(EINVAL);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#ifdef DEBUG_IPFIREWALL
|
|
|
|
printf("ip_acct_ctl: unknown request %d\n",stage);
|
|
|
|
#endif
|
|
|
|
return(EINVAL);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#ifdef IPFIREWALL
|
1994-10-28 15:09:49 +00:00
|
|
|
int
|
1994-11-08 12:47:29 +00:00
|
|
|
ip_fw_ctl(stage,m)
|
1994-10-28 15:09:49 +00:00
|
|
|
int stage;
|
|
|
|
struct mbuf *m;
|
|
|
|
{
|
|
|
|
if ( stage == IP_FW_FLUSH )
|
|
|
|
{
|
1994-11-08 12:47:29 +00:00
|
|
|
free_fw_chain(&ip_fw_blk_chain);
|
|
|
|
free_fw_chain(&ip_fw_fwd_chain);
|
1994-10-28 15:09:49 +00:00
|
|
|
return(0);
|
|
|
|
}
|
|
|
|
|
1994-11-16 10:17:11 +00:00
|
|
|
if ( m == 0 )
|
|
|
|
{
|
|
|
|
printf("ip_fw_ctl: NULL mbuf ptr\n");
|
|
|
|
return(EINVAL);
|
|
|
|
}
|
1994-10-28 15:09:49 +00:00
|
|
|
|
|
|
|
if ( stage == IP_FW_POLICY )
|
|
|
|
{
|
1994-11-16 10:17:11 +00:00
|
|
|
int *tmp_policy_ptr;
|
1994-10-28 15:09:49 +00:00
|
|
|
tmp_policy_ptr=mtod(m,int *);
|
1994-10-31 23:58:04 +00:00
|
|
|
if ((*tmp_policy_ptr)!=1 && (*tmp_policy_ptr)!=0)
|
1994-11-16 10:17:11 +00:00
|
|
|
return (EINVAL);
|
1994-10-28 15:09:49 +00:00
|
|
|
ip_fw_policy=*tmp_policy_ptr;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
1994-11-16 10:17:11 +00:00
|
|
|
if ( stage == IP_FW_CHK_BLK
|
|
|
|
|| stage == IP_FW_CHK_FWD ) {
|
1994-10-28 15:09:49 +00:00
|
|
|
|
|
|
|
struct ip *ip;
|
1994-11-16 10:17:11 +00:00
|
|
|
|
1994-10-28 15:09:49 +00:00
|
|
|
if ( m->m_len < sizeof(struct ip) + 2 * sizeof(u_short) ) {
|
1994-11-08 12:47:29 +00:00
|
|
|
#ifdef DEBUG_IPFIREWALL
|
1994-11-16 10:17:11 +00:00
|
|
|
printf("ip_fw_ctl: mbuf len=%d, want at least %d\n",
|
|
|
|
m->m_len,sizeof(struct ip) + 2 * sizeof(u_short));
|
1994-11-08 12:47:29 +00:00
|
|
|
#endif
|
1994-10-28 15:09:49 +00:00
|
|
|
return( EINVAL );
|
1994-11-16 10:17:11 +00:00
|
|
|
}
|
|
|
|
|
1994-10-28 15:09:49 +00:00
|
|
|
ip = mtod(m,struct ip *);
|
1994-11-16 10:17:11 +00:00
|
|
|
|
1994-10-28 15:09:49 +00:00
|
|
|
if ( ip->ip_hl != sizeof(struct ip) / sizeof(int) ) {
|
1994-11-08 12:47:29 +00:00
|
|
|
#ifdef DEBUG_IPFIREWALL
|
1994-11-16 10:17:11 +00:00
|
|
|
printf("ip_fw_ctl: ip->ip_hl=%d, want %d\n",ip->ip_hl,
|
|
|
|
sizeof(struct ip)/sizeof(int));
|
1994-11-08 12:47:29 +00:00
|
|
|
#endif
|
1994-11-16 10:17:11 +00:00
|
|
|
return(EINVAL);
|
|
|
|
}
|
|
|
|
|
1994-11-08 12:47:29 +00:00
|
|
|
if ( ip_fw_chk(ip,
|
1994-10-28 15:09:49 +00:00
|
|
|
stage == IP_FW_CHK_BLK ?
|
|
|
|
ip_fw_blk_chain : ip_fw_fwd_chain )
|
|
|
|
)
|
1994-11-16 10:17:11 +00:00
|
|
|
return(0);
|
|
|
|
else
|
|
|
|
return(EACCES);
|
|
|
|
}
|
1994-10-28 15:09:49 +00:00
|
|
|
|
1994-11-16 10:17:11 +00:00
|
|
|
/*
|
|
|
|
* Here we really working hard-adding new elements
|
|
|
|
* to blocking/forwarding chains or deleting'em
|
|
|
|
*/
|
1994-10-28 15:09:49 +00:00
|
|
|
|
1994-11-16 10:17:11 +00:00
|
|
|
if ( stage == IP_FW_ADD_BLK
|
|
|
|
|| stage == IP_FW_ADD_FWD
|
|
|
|
|| stage == IP_FW_DEL_BLK
|
|
|
|
|| stage == IP_FW_DEL_FWD
|
|
|
|
) {
|
1994-10-28 15:09:49 +00:00
|
|
|
|
1994-11-16 10:17:11 +00:00
|
|
|
struct ip_fw *frwl;
|
|
|
|
|
|
|
|
frwl=check_ipfw_struct(m);
|
|
|
|
if (frwl==NULL)
|
|
|
|
return (EINVAL);
|
|
|
|
#ifdef nenado
|
|
|
|
if (!(frwl=check_ipfw_struct(m)))
|
|
|
|
return (EINVAL);
|
1994-11-08 12:47:29 +00:00
|
|
|
#endif
|
1994-10-28 15:09:49 +00:00
|
|
|
|
1994-11-16 10:17:11 +00:00
|
|
|
switch (stage) {
|
|
|
|
case IP_FW_ADD_BLK:
|
|
|
|
return(add_to_chain(&ip_fw_blk_chain,frwl));
|
|
|
|
case IP_FW_ADD_FWD:
|
|
|
|
return(add_to_chain(&ip_fw_fwd_chain,frwl));
|
|
|
|
case IP_FW_DEL_BLK:
|
|
|
|
return(del_from_chain(&ip_fw_blk_chain,frwl));
|
|
|
|
case IP_FW_DEL_FWD:
|
|
|
|
return(del_from_chain(&ip_fw_fwd_chain,frwl));
|
|
|
|
default:
|
|
|
|
/*
|
|
|
|
* Should be panic but...
|
|
|
|
*/
|
1994-11-08 12:47:29 +00:00
|
|
|
#ifdef DEBUG_IPFIREWALL
|
1994-11-16 10:17:11 +00:00
|
|
|
printf("ip_fw_ctl: unknown request %d\n",stage);
|
1994-11-08 12:47:29 +00:00
|
|
|
#endif
|
1994-11-16 10:17:11 +00:00
|
|
|
return(EINVAL);
|
1994-10-28 15:09:49 +00:00
|
|
|
}
|
1994-11-16 10:17:11 +00:00
|
|
|
}
|
1994-10-28 15:09:49 +00:00
|
|
|
|
1994-11-08 12:47:29 +00:00
|
|
|
#ifdef DEBUG_IPFIREWALL
|
|
|
|
printf("ip_fw_ctl: unknown request %d\n",stage);
|
|
|
|
#endif
|
1994-10-28 15:09:49 +00:00
|
|
|
return(EINVAL);
|
|
|
|
}
|
1994-11-16 10:17:11 +00:00
|
|
|
#endif /* IPFIREWALL */
|