933 lines
21 KiB
C
933 lines
21 KiB
C
/*
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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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* $Id: ip_fw.c,v 1.21 1995/07/23 05:36:29 davidg Exp $
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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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#include <sys/time.h>
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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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#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/tcp.h>
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#include <netinet/udp.h>
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#include <netinet/ip_icmp.h>
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#include <netinet/ip_fw.h>
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#ifdef IPFIREWALL_DEBUG
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#define dprintf1(a) printf(a)
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#define dprintf2(a1,a2) printf(a1,a2)
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#define dprintf3(a1,a2,a3) printf(a1,a2,a3)
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#define dprintf4(a1,a2,a3,a4) printf(a1,a2,a3,a4)
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#else
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#define dprintf1(a)
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#define dprintf2(a1,a2)
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#define dprintf3(a1,a2,a3)
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#define dprintf4(a1,a2,a3,a4)
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#endif
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#ifndef TRUE
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#define TRUE 1
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#endif
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#ifndef FALSE
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#define FALSE 0
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#endif
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#define print_ip(a) printf("%ld.%ld.%ld.%ld",(ntohl(a.s_addr)>>24)&0xFF,\
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(ntohl(a.s_addr)>>16)&0xFF,\
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(ntohl(a.s_addr)>>8)&0xFF,\
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(ntohl(a.s_addr))&0xFF);
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#ifdef IPFIREWALL_DEBUG
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#define dprint_ip(a) print_ip(a)
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#else
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#define dprint_ip(a)
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#endif
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/*
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* Returns TRUE if the port is matched by the vector, FALSE otherwise
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*/
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inline int
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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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if (!nports)
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return TRUE;
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if (range_flag) {
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if (portptr[0] <= port && port <= portptr[1]) {
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return TRUE;
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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 TRUE;
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}
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}
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return FALSE;
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}
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/*
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* Returns TRUE if it should be accepted, FALSE otherwise.
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*/
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#ifdef IPFIREWALL
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int
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ip_fw_chk(m, ip, rif, chain)
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struct mbuf *m;
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struct ip *ip;
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struct ifnet *rif;
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struct ip_fw *chain;
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{
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register struct ip_fw *f;
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struct tcphdr *tcp = (struct tcphdr *) ((u_long *) ip + ip->ip_hl);
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struct udphdr *udp = (struct udphdr *) ((u_long *) ip + ip->ip_hl);
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struct icmp *icmp = (struct icmp *) ((u_long *) ip + ip->ip_hl);
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struct ifaddr *ia = NULL, *ia_p;
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struct in_addr src, dst, ia_i;
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u_short src_port = 0, dst_port = 0;
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u_short f_prt = 0, prt;
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char notcpsyn = 1;
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/*
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* If the chain is empty allow any packet-this is equal to disabling
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* firewall.
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*/
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if (chain == NULL)
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return TRUE;
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/*
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* This way we handle fragmented packets. we ignore all fragments but
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* the first one so the whole packet can't be reassembled. This way we
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* relay on the full info which stored only in first packet.
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*/
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if (ip->ip_off & IP_OFFMASK)
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return TRUE;
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src = ip->ip_src;
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dst = ip->ip_dst;
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/*
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* If we got interface from which packet came-store pointer to it's
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* first adress
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*/
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if (rif != NULL)
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ia = rif->if_addrlist;
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dprintf1("Packet ");
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switch (ip->ip_p) {
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case IPPROTO_TCP:
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dprintf1("TCP ");
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src_port = ntohs(tcp->th_sport);
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dst_port = ntohs(tcp->th_dport);
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if ((tcp->th_flags & TH_SYN) && !(tcp->th_flags & TH_ACK))
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notcpsyn = 0; /* We *DO* have SYN ,value FALSE */
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prt = IP_FW_F_TCP;
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break;
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case IPPROTO_UDP:
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dprintf1("UDP ");
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src_port = ntohs(udp->uh_sport);
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dst_port = ntohs(udp->uh_dport);
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prt = IP_FW_F_UDP;
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break;
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case IPPROTO_ICMP:
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dprintf2("ICMP:%u ", icmp->icmp_type);
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prt = IP_FW_F_ICMP;
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break;
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default:
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dprintf2("p=%d ", ip->ip_p);
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prt = IP_FW_F_ALL;
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break;
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}
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dprint_ip(ip->ip_src);
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if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP) {
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dprintf2(":%d ", src_port);
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}
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dprint_ip(ip->ip_dst);
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if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP) {
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dprintf2(":%d ", dst_port);
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}
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dprintf1("\n");
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for (f = chain; f != NULL; f = f->fw_next)
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if ((src.s_addr & f->fw_smsk.s_addr) == f->fw_src.s_addr &&
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(dst.s_addr & f->fw_dmsk.s_addr) == f->fw_dst.s_addr) {
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if (rif == NULL)
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goto via_match;
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if (f->fw_flg & IP_FW_F_IFNAME) {
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/*
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* No name/unit set so
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* match any.
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*/
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if (!f->fw_via_name[0])
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goto via_match;
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if (rif->if_unit == f->fw_via_unit &&
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!strncmp(rif->if_name, f->fw_via_name, FW_IFNLEN))
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goto via_match;
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} else {
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/*
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* No via ip set so match
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* any.
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*/
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if (!f->fw_via_ip.s_addr)
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goto via_match;
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for (ia_p = ia; ia_p != NULL; ia_p = ia_p->ifa_next) {
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if ((ia_p->ifa_addr == NULL) ||
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(ia_p->ifa_addr->sa_family != AF_INET))
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continue;
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ia_i.s_addr =
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((struct sockaddr_in *)(ia_p->ifa_addr))->sin_addr.s_addr;
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if (ia_i.s_addr == f->fw_via_ip.s_addr)
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goto via_match;
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}
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}
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/*
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* If we got here,no "via"'s matched,so we should
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* continue to the next firewall entry.
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*/
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continue;
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via_match:
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f_prt = f->fw_flg & IP_FW_F_KIND;
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if (f_prt == IP_FW_F_ALL) {
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/* Universal frwl - we've got a match! */
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goto got_match;
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} else {
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/*
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* This is actually buggy as if you set SYN
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* flag on UDp or ICMP firewall it will never
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* work,but actually it is a concern of
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* software which sets firewall entries.
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*/
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if (f->fw_flg & IP_FW_F_TCPSYN && notcpsyn)
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continue;
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/*
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* Specific firewall - packet's protocol must
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* match firewall's
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*/
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if (prt == f_prt) {
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if (prt == IP_FW_F_ICMP ||
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(port_match(&f->fw_pts[0], f->fw_nsp, src_port,
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f->fw_flg & IP_FW_F_SRNG) &&
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port_match(&f->fw_pts[f->fw_nsp], f->fw_ndp, dst_port,
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f->fw_flg & IP_FW_F_DRNG))) {
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goto got_match;
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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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/*
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* If we get here then none of the firewalls matched. So now we relay
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* on policy defined by user-unmatched packet can be ever accepted or
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* rejected...
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*/
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if (ip_fw_policy & IP_FW_P_DENY) {
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f = (struct ip_fw *) NULL;
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goto bad_packet;
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}
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return TRUE;
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got_match:
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#ifdef IPFIREWALL_VERBOSE
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/*
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* VERY ugly piece of code which actually makes kernel printf for
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* denied packets...
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*/
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if (f->fw_flg & IP_FW_F_PRN) {
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if (f->fw_flg & IP_FW_F_ACCEPT)
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printf("Accept ");
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else
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printf("Deny ");
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switch (ip->ip_p) {
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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:%u ", icmp->icmp_type);
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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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}
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print_ip(ip->ip_src);
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if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP)
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printf(":%d", src_port);
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printf(" ");
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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", dst_port);
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printf("\n");
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}
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#endif
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if (f->fw_flg & IP_FW_F_ACCEPT)
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return TRUE;
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bad_packet:
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if (f != NULL) {
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/*
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* Do not ICMP reply to icmp packets....:) or to packets
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* rejected by entry without the special ICMP reply flag.
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*/
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if ((f_prt == IP_FW_F_ICMP) ||
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!(f->fw_flg & IP_FW_F_ICMPRPL)) {
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m_freem(m);
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return FALSE;
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}
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if (f_prt == IP_FW_F_ALL)
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icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0L, 0);
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else
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icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0L, 0);
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return FALSE;
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}
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m_freem(m);
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return FALSE;
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}
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#endif /* IPFIREWALL */
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#ifdef IPACCT
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void
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ip_acct_cnt(ip, rif, chain, nh_conv)
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struct ip *ip;
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struct ifnet *rif;
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struct ip_fw *chain;
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int nh_conv;
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{
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register struct ip_fw *f;
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struct tcphdr *tcp = (struct tcphdr *) ((u_long *) ip + ip->ip_hl);
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struct udphdr *udp = (struct udphdr *) ((u_long *) ip + ip->ip_hl);
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struct ifaddr *ia = NULL, *ia_p;
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struct in_addr src, dst, ia_i;
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u_short src_port = 0, dst_port = 0;
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u_short f_prt, prt = 0;
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char rev = 0;
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if (chain == NULL)
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return;
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if (ip->ip_off & IP_OFFMASK)
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return;
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src = ip->ip_src;
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dst = ip->ip_dst;
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if (rif != NULL)
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ia = rif->if_addrlist;
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switch (ip->ip_p) {
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case IPPROTO_TCP:
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src_port = ntohs(tcp->th_sport);
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dst_port = ntohs(tcp->th_dport);
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prt = IP_FW_F_TCP;
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break;
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case IPPROTO_UDP:
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src_port = ntohs(udp->uh_sport);
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dst_port = ntohs(udp->uh_dport);
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prt = IP_FW_F_UDP;
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break;
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case IPPROTO_ICMP:
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prt = IP_FW_F_ICMP;
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break;
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default:
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prt = IP_FW_F_ALL;
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break;
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}
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for (f = chain; f != NULL; f = f->fw_next) {
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if ((src.s_addr & f->fw_smsk.s_addr) == f->fw_src.s_addr
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&& (dst.s_addr & f->fw_dmsk.s_addr) == f->fw_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->fw_flg & IP_FW_F_BIDIR) &&
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((src.s_addr & f->fw_smsk.s_addr) == f->fw_dst.s_addr
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&& (dst.s_addr & f->fw_dmsk.s_addr) == f->fw_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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/*
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* We use here same code for "via" matching as in
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* firewall.This is wrong and does not do much use,because in
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* most cases instead of interface passed NULL pointer.Need to
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* be completely rewritten.
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*/
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if (rif == NULL)
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goto via_match;
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if (f->fw_flg & IP_FW_F_IFNAME) {
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if (!f->fw_via_name[0])
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goto via_match; /* No name/unit set,match any */
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if (rif->if_unit == f->fw_via_unit &&
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!strncmp(rif->if_name, f->fw_via_name, FW_IFNLEN))
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goto via_match;
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} else {
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/*
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* No via ip set so
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* match any?
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*/
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if (!f->fw_via_ip.s_addr)
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goto via_match;
|
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|
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for (ia_p = ia; ia_p != NULL; ia_p = ia_p->ifa_next) {
|
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if (!ia_p->ifa_addr || ia_p->ifa_addr->sa_family != AF_INET)
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continue;
|
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|
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ia_i.s_addr =
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((struct sockaddr_in *) (ia_p->ifa_addr))->sin_addr.s_addr;
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if (ia_i.s_addr == f->fw_via_ip.s_addr)
|
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goto via_match;
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}
|
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}
|
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/*
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* If we got here,no "via"'s matched,so we should continue to
|
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* the next firewall entry.
|
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*/
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continue;
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via_match:
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f_prt = f->fw_flg & IP_FW_F_KIND;
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if (f_prt == IP_FW_F_ALL) {
|
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/* Universal frwl - we've got a match! */
|
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|
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f->fw_pcnt++; /* Rise packet count */
|
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|
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/*
|
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* Rise byte count, if need to convert from host to
|
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* network byte order,do it.
|
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*/
|
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if (nh_conv)
|
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f->fw_bcnt += ntohs(ip->ip_len);
|
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else
|
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f->fw_bcnt += ip->ip_len;
|
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} else {
|
|
/*
|
|
* Specific firewall - packet's protocol must match
|
|
* firewall's
|
|
*/
|
|
if (prt == f_prt) {
|
|
|
|
if ((prt == IP_FW_F_ICMP ||
|
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(port_match(&f->fw_pts[0], f->fw_nsp, src_port,
|
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f->fw_flg & IP_FW_F_SRNG) &&
|
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port_match(&f->fw_pts[f->fw_nsp], f->fw_ndp, dst_port,
|
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f->fw_flg & IP_FW_F_DRNG))) ||
|
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((rev) && (port_match(&f->fw_pts[0], f->fw_nsp, dst_port,
|
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f->fw_flg & IP_FW_F_SRNG) &&
|
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port_match(&f->fw_pts[f->fw_nsp], f->fw_ndp, src_port,
|
|
f->fw_flg & IP_FW_F_DRNG)))) {
|
|
f->fw_pcnt++; /* Rise packet count */
|
|
/*
|
|
* Rise byte count, if need to convert
|
|
* from host to network byte order,do
|
|
* it.
|
|
*/
|
|
if (nh_conv)
|
|
f->fw_bcnt += ntohs(ip->ip_len);
|
|
else
|
|
f->fw_bcnt += ip->ip_len;
|
|
} /* Ports match */
|
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} /* Proto matches */
|
|
} /* ALL/Specific */
|
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} /* IP addr/mask matches */
|
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}
|
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#endif /* IPACCT */
|
|
|
|
static void
|
|
zero_fw_chain(chainptr)
|
|
struct ip_fw *chainptr;
|
|
{
|
|
struct ip_fw *ctmp = chainptr;
|
|
|
|
while (ctmp != NULL) {
|
|
ctmp->fw_pcnt = 0l;
|
|
ctmp->fw_bcnt = 0l;
|
|
ctmp = ctmp->fw_next;
|
|
}
|
|
}
|
|
|
|
static void
|
|
free_fw_chain(chainptr)
|
|
struct ip_fw **chainptr;
|
|
{
|
|
int s;
|
|
|
|
s = splnet();
|
|
while (*chainptr != NULL) {
|
|
struct ip_fw *ftmp;
|
|
|
|
ftmp = *chainptr;
|
|
*chainptr = ftmp->fw_next;
|
|
free(ftmp, M_IPFW);
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
static int
|
|
add_entry(chainptr, frwl)
|
|
struct ip_fw **chainptr;
|
|
struct ip_fw *frwl;
|
|
{
|
|
struct ip_fw *ftmp;
|
|
struct ip_fw *chtmp = NULL;
|
|
struct ip_fw *chtmp_prev = NULL;
|
|
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;
|
|
u_short n_sr, n_dr, o_sr, o_dr;
|
|
u_short oldkind, newkind;
|
|
int addb4 = 0;
|
|
int n_o, n_n;
|
|
int s;
|
|
|
|
s = splnet();
|
|
|
|
ftmp = malloc(sizeof(struct ip_fw), M_IPFW, M_DONTWAIT);
|
|
if (ftmp == NULL) {
|
|
dprintf1("ip_fw_ctl: malloc said no\n");
|
|
splx(s);
|
|
return (ENOSPC);
|
|
}
|
|
bcopy(frwl, ftmp, sizeof(struct ip_fw));
|
|
ftmp->fw_pcnt = 0L;
|
|
ftmp->fw_bcnt = 0L;
|
|
|
|
ftmp->fw_next = NULL;
|
|
|
|
if (*chainptr == NULL) {
|
|
*chainptr = ftmp;
|
|
} else {
|
|
chtmp_prev = NULL;
|
|
for (chtmp = *chainptr; chtmp != NULL; chtmp = chtmp->fw_next) {
|
|
|
|
addb4 = 0;
|
|
|
|
newkind = ftmp->fw_flg & IP_FW_F_KIND;
|
|
oldkind = chtmp->fw_flg & IP_FW_F_KIND;
|
|
|
|
if (newkind != IP_FW_F_ALL &&
|
|
oldkind != IP_FW_F_ALL &&
|
|
oldkind != newkind) {
|
|
chtmp_prev = chtmp;
|
|
continue;
|
|
}
|
|
/*
|
|
* Very very *UGLY* code... Sorry,but i had to do
|
|
* this....
|
|
*/
|
|
n_sa = ntohl(ftmp->fw_src.s_addr);
|
|
n_da = ntohl(ftmp->fw_dst.s_addr);
|
|
n_sm = ntohl(ftmp->fw_smsk.s_addr);
|
|
n_dm = ntohl(ftmp->fw_dmsk.s_addr);
|
|
|
|
o_sa = ntohl(chtmp->fw_src.s_addr);
|
|
o_da = ntohl(chtmp->fw_dst.s_addr);
|
|
o_sm = ntohl(chtmp->fw_smsk.s_addr);
|
|
o_dm = ntohl(chtmp->fw_dmsk.s_addr);
|
|
|
|
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))) {
|
|
if (newkind != IP_FW_F_ALL &&
|
|
oldkind == IP_FW_F_ALL)
|
|
addb4++;
|
|
if (newkind == oldkind && (oldkind == IP_FW_F_TCP ||
|
|
oldkind == IP_FW_F_UDP)) {
|
|
/*
|
|
* Here the main idea 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->fw_flg & IP_FW_F_SRNG)
|
|
n_sr = ftmp->fw_pts[1] - ftmp->fw_pts[0];
|
|
else
|
|
n_sr = (ftmp->fw_nsp) ?
|
|
ftmp->fw_nsp : USHRT_MAX;
|
|
|
|
if (chtmp->fw_flg & IP_FW_F_SRNG)
|
|
o_sr = chtmp->fw_pts[1] - chtmp->fw_pts[0];
|
|
else
|
|
o_sr = (chtmp->fw_nsp) ?
|
|
chtmp->fw_nsp : USHRT_MAX;
|
|
|
|
if (n_sr < o_sr)
|
|
addb4++;
|
|
if (n_sr > o_sr)
|
|
addb4--;
|
|
|
|
n_n = ftmp->fw_nsp;
|
|
n_o = chtmp->fw_nsp;
|
|
/*
|
|
* Actually this cannot happen as the
|
|
* frwl control procedure checks for
|
|
* number of ports in source and
|
|
* destination range but we will try
|
|
* to be more safe.
|
|
*/
|
|
if ((n_n > (IP_FW_MAX_PORTS - 2)) ||
|
|
(n_o > (IP_FW_MAX_PORTS - 2)))
|
|
goto skip_check;
|
|
|
|
if (ftmp->fw_flg & IP_FW_F_DRNG)
|
|
n_dr = ftmp->fw_pts[n_n + 1] - ftmp->fw_pts[n_n];
|
|
else
|
|
n_dr = (ftmp->fw_ndp) ?
|
|
ftmp->fw_ndp : USHRT_MAX;
|
|
|
|
if (chtmp->fw_flg & IP_FW_F_DRNG)
|
|
o_dr = chtmp->fw_pts[n_o + 1] - chtmp->fw_pts[n_o];
|
|
else
|
|
o_dr = (chtmp->fw_ndp) ?
|
|
chtmp->fw_ndp : USHRT_MAX;
|
|
if (n_dr < o_dr)
|
|
addb4++;
|
|
if (n_dr > o_dr)
|
|
addb4--;
|
|
|
|
skip_check:
|
|
}
|
|
}
|
|
if (addb4 > 0) {
|
|
if (chtmp_prev != NULL) {
|
|
chtmp_prev->fw_next = ftmp;
|
|
ftmp->fw_next = chtmp;
|
|
} else {
|
|
*chainptr = ftmp;
|
|
ftmp->fw_next = chtmp;
|
|
}
|
|
splx(s);
|
|
return 0;
|
|
}
|
|
chtmp_prev = chtmp;
|
|
}
|
|
if (chtmp_prev != NULL)
|
|
chtmp_prev->fw_next = ftmp;
|
|
else
|
|
#ifdef DIAGNOSTIC
|
|
panic("Can't happen");
|
|
#else
|
|
*chainptr = ftmp;
|
|
#endif
|
|
}
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
del_entry(chainptr, frwl)
|
|
struct ip_fw **chainptr;
|
|
struct ip_fw *frwl;
|
|
{
|
|
struct ip_fw *ftmp, *ltmp;
|
|
u_short tport1, tport2, tmpnum;
|
|
char matches, was_found;
|
|
int s;
|
|
|
|
s = splnet();
|
|
|
|
ftmp = *chainptr;
|
|
|
|
if (ftmp == NULL) {
|
|
dprintf1("ip_fw_ctl: chain is empty\n");
|
|
splx(s);
|
|
return (EINVAL);
|
|
}
|
|
ltmp = NULL;
|
|
was_found = 0;
|
|
|
|
while (ftmp != NULL) {
|
|
matches = 1;
|
|
if (ftmp->fw_src.s_addr != frwl->fw_src.s_addr ||
|
|
ftmp->fw_dst.s_addr != frwl->fw_dst.s_addr ||
|
|
ftmp->fw_smsk.s_addr != frwl->fw_smsk.s_addr ||
|
|
ftmp->fw_dmsk.s_addr != frwl->fw_dmsk.s_addr ||
|
|
ftmp->fw_via_ip.s_addr != frwl->fw_via_ip.s_addr ||
|
|
ftmp->fw_flg != frwl->fw_flg)
|
|
matches = 0;
|
|
tport1 = ftmp->fw_nsp + ftmp->fw_ndp;
|
|
tport2 = frwl->fw_nsp + frwl->fw_ndp;
|
|
if (tport1 != tport2)
|
|
matches = 0;
|
|
else if (tport1 != 0) {
|
|
for (tmpnum = 0; tmpnum < tport1 && tmpnum < IP_FW_MAX_PORTS; tmpnum++)
|
|
if (ftmp->fw_pts[tmpnum] != frwl->fw_pts[tmpnum])
|
|
matches = 0;
|
|
}
|
|
if (matches) {
|
|
was_found = 1;
|
|
if (ltmp != NULL) {
|
|
ltmp->fw_next = ftmp->fw_next;
|
|
free(ftmp, M_IPFW);
|
|
ftmp = ltmp->fw_next;
|
|
} else {
|
|
*chainptr = ftmp->fw_next;
|
|
free(ftmp, M_IPFW);
|
|
ftmp = *chainptr;
|
|
}
|
|
|
|
} else {
|
|
ltmp = ftmp;
|
|
ftmp = ftmp->fw_next;
|
|
}
|
|
}
|
|
splx(s);
|
|
|
|
if (was_found)
|
|
return 0;
|
|
else
|
|
return (EINVAL);
|
|
}
|
|
|
|
static int
|
|
clr_entry(chainptr, frwl)
|
|
struct ip_fw **chainptr;
|
|
struct ip_fw *frwl;
|
|
{
|
|
struct ip_fw *ftmp, *ltmp;
|
|
u_short tport1, tport2, tmpnum;
|
|
char matches, was_found;
|
|
|
|
ftmp = *chainptr;
|
|
|
|
if (ftmp == NULL) {
|
|
dprintf1("ip_fw_ctl: chain is empty\n");
|
|
return (EINVAL);
|
|
}
|
|
was_found = 0;
|
|
|
|
while (ftmp != NULL) {
|
|
matches = 1;
|
|
if (ftmp->fw_src.s_addr != frwl->fw_src.s_addr ||
|
|
ftmp->fw_dst.s_addr != frwl->fw_dst.s_addr ||
|
|
ftmp->fw_smsk.s_addr != frwl->fw_smsk.s_addr ||
|
|
ftmp->fw_dmsk.s_addr != frwl->fw_dmsk.s_addr ||
|
|
ftmp->fw_via_ip.s_addr != frwl->fw_via_ip.s_addr ||
|
|
ftmp->fw_flg != frwl->fw_flg)
|
|
matches = 0;
|
|
tport1 = ftmp->fw_nsp + ftmp->fw_ndp;
|
|
tport2 = frwl->fw_nsp + frwl->fw_ndp;
|
|
if (tport1 != tport2)
|
|
matches = 0;
|
|
else if (tport1 != 0) {
|
|
for (tmpnum = 0; tmpnum < tport1 && tmpnum < IP_FW_MAX_PORTS; tmpnum++)
|
|
if (ftmp->fw_pts[tmpnum] != frwl->fw_pts[tmpnum])
|
|
matches = 0;
|
|
}
|
|
if (matches) {
|
|
was_found = 1;
|
|
ftmp->fw_pcnt = 0L;
|
|
ftmp->fw_bcnt = 0L;
|
|
}
|
|
ftmp = ftmp->fw_next;
|
|
}
|
|
if (was_found)
|
|
return 0;
|
|
else
|
|
return (EINVAL);
|
|
}
|
|
|
|
struct ip_fw *
|
|
check_ipfw_struct(m)
|
|
struct mbuf *m;
|
|
{
|
|
struct ip_fw *frwl;
|
|
|
|
if (m->m_len != sizeof(struct ip_fw)) {
|
|
dprintf3("ip_fw_ctl: len=%d, want %d\n", m->m_len,
|
|
sizeof(struct ip_fw));
|
|
return (NULL);
|
|
}
|
|
frwl = mtod(m, struct ip_fw *);
|
|
|
|
if ((frwl->fw_flg & ~IP_FW_F_MASK) != 0) {
|
|
dprintf2("ip_fw_ctl: undefined flag bits set (flags=%x)\n",
|
|
frwl->fw_flg);
|
|
return (NULL);
|
|
}
|
|
if ((frwl->fw_flg & IP_FW_F_SRNG) && frwl->fw_nsp < 2) {
|
|
dprintf2("ip_fw_ctl: src range set but n_src_p=%d\n",
|
|
frwl->fw_nsp);
|
|
return (NULL);
|
|
}
|
|
if ((frwl->fw_flg & IP_FW_F_DRNG) && frwl->fw_ndp < 2) {
|
|
dprintf2("ip_fw_ctl: dst range set but n_dst_p=%d\n",
|
|
frwl->fw_ndp);
|
|
return (NULL);
|
|
}
|
|
if (frwl->fw_nsp + frwl->fw_ndp > IP_FW_MAX_PORTS) {
|
|
dprintf3("ip_fw_ctl: too many ports (%d+%d)\n",
|
|
frwl->fw_nsp, frwl->fw_ndp);
|
|
return (NULL);
|
|
}
|
|
#if 0
|
|
if ((frwl->fw_flg & IP_FW_F_KIND) == IP_FW_F_ICMP) {
|
|
dprintf1("ip_fw_ctl: request for unsupported ICMP frwling\n");
|
|
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 ||
|
|
stage == IP_ACCT_CLR) {
|
|
|
|
struct ip_fw *frwl;
|
|
|
|
if ((frwl = check_ipfw_struct(m)) == NULL)
|
|
return (EINVAL);
|
|
|
|
switch (stage) {
|
|
case IP_ACCT_ADD:
|
|
return (add_entry(&ip_acct_chain, frwl));
|
|
case IP_ACCT_DEL:
|
|
return (del_entry(&ip_acct_chain, frwl));
|
|
case IP_ACCT_CLR:
|
|
return (clr_entry(&ip_acct_chain, frwl));
|
|
default:
|
|
#ifdef DIAGNOSTIC
|
|
panic("Can't happen");
|
|
#else
|
|
dprintf2("ip_acct_ctl: unknown request %d\n", stage);
|
|
return (EINVAL);
|
|
#endif
|
|
}
|
|
}
|
|
dprintf2("ip_acct_ctl: unknown request %d\n", stage);
|
|
return (EINVAL);
|
|
}
|
|
#endif
|
|
|
|
#ifdef IPFIREWALL
|
|
int
|
|
ip_fw_ctl(stage, m)
|
|
int stage;
|
|
struct mbuf *m;
|
|
{
|
|
if (stage == IP_FW_FLUSH) {
|
|
free_fw_chain(&ip_fw_chain);
|
|
return (0);
|
|
}
|
|
if (m == NULL) {
|
|
printf("ip_fw_ctl: NULL mbuf ptr\n");
|
|
return (EINVAL);
|
|
}
|
|
if (stage == IP_FW_POLICY) {
|
|
u_short *tmp_policy_ptr;
|
|
|
|
tmp_policy_ptr = mtod(m, u_short *);
|
|
if ((*tmp_policy_ptr) & ~IP_FW_P_MASK)
|
|
return (EINVAL);
|
|
ip_fw_policy = *tmp_policy_ptr;
|
|
return 0;
|
|
}
|
|
/*
|
|
* Here we really working hard-adding new elements
|
|
* to firewall chain or deleting'em
|
|
*/
|
|
|
|
if (stage == IP_FW_ADD ||
|
|
stage == IP_FW_DEL) {
|
|
|
|
struct ip_fw *frwl;
|
|
|
|
if ((frwl = check_ipfw_struct(m)) == NULL)
|
|
return (EINVAL);
|
|
|
|
switch (stage) {
|
|
case IP_FW_ADD:
|
|
return (add_entry(&ip_fw_chain, frwl));
|
|
case IP_FW_DEL:
|
|
return (del_entry(&ip_fw_chain, frwl));
|
|
default:
|
|
#ifdef DIAGNOSTIC
|
|
panic("Can't happen");
|
|
#else
|
|
dprintf2("ip_fw_ctl: unknown request %d\n", stage);
|
|
return (EINVAL);
|
|
#endif
|
|
}
|
|
}
|
|
dprintf2("ip_fw_ctl: unknown request %d\n", stage);
|
|
return (EINVAL);
|
|
}
|
|
#endif /* IPFIREWALL */
|