mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-04 09:09:56 +00:00
1b2556e4a4
This is untested, but believed to work.
1244 lines
30 KiB
C
1244 lines
30 KiB
C
/* $FreeBSD$ */
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/* $KAME: ip6_fw.c,v 1.15 2000/07/02 14:17:37 itojun Exp $ */
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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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* Copyright (c) 1996 Alex Nash
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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 IPv6 packet firewall
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*/
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#if !defined(KLD_MODULE)
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#include "opt_ip6fw.h"
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#endif
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#ifdef IP6DIVERT
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#error "NOT SUPPORTED IPV6 DIVERT"
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#endif
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#ifdef IP6FW_DIVERT_RESTART
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#error "NOT SUPPORTED IPV6 DIVERT"
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#endif
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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/queue.h>
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#include <sys/kernel.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/time.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netinet/in_systm.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/in6_var.h>
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#include <netinet/icmp6.h>
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#include <netinet/in_pcb.h>
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#include <netinet6/ip6_fw.h>
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#include <netinet/ip_var.h>
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#include <netinet/tcp.h>
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#include <netinet/tcp_seq.h>
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#include <netinet/tcp_timer.h>
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#include <netinet/tcp_var.h>
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#include <netinet/udp.h>
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#include <sys/sysctl.h>
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#include <net/net_osdep.h>
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MALLOC_DEFINE(M_IP6FW, "Ip6Fw/Ip6Acct", "Ip6Fw/Ip6Acct chain's");
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static int fw6_debug = 1;
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#ifdef IPV6FIREWALL_VERBOSE
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static int fw6_verbose = 1;
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#else
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static int fw6_verbose = 0;
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#endif
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#ifdef IPV6FIREWALL_VERBOSE_LIMIT
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static int fw6_verbose_limit = IPV6FIREWALL_VERBOSE_LIMIT;
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#else
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static int fw6_verbose_limit = 0;
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#endif
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LIST_HEAD (ip6_fw_head, ip6_fw_chain) ip6_fw_chain;
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#ifdef SYSCTL_NODE
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SYSCTL_DECL(_net_inet6_ip6);
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SYSCTL_NODE(_net_inet6_ip6, OID_AUTO, fw, CTLFLAG_RW, 0, "Firewall");
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SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, enable, CTLFLAG_RW,
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&ip6_fw_enable, 0, "Enable ip6fw");
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SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, debug, CTLFLAG_RW, &fw6_debug, 0, "");
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SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, verbose, CTLFLAG_RW, &fw6_verbose, 0, "");
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SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, verbose_limit, CTLFLAG_RW, &fw6_verbose_limit, 0, "");
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#endif
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#define dprintf(a) if (!fw6_debug); else printf a
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#define print_ip6(a) printf("[%s]", ip6_sprintf(a))
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#define dprint_ip6(a) if (!fw6_debug); else print_ip6(a)
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static int add_entry6 __P((struct ip6_fw_head *chainptr, struct ip6_fw *frwl));
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static int del_entry6 __P((struct ip6_fw_head *chainptr, u_short number));
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static int zero_entry6 __P((struct mbuf *m));
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static struct ip6_fw *check_ip6fw_struct __P((struct ip6_fw *m));
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static struct ip6_fw *check_ip6fw_mbuf __P((struct mbuf *fw));
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static int ip6opts_match __P((struct ip6_hdr **ip6, struct ip6_fw *f,
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struct mbuf **m,
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int *off, int *nxt, u_short *offset));
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static int port_match6 __P((u_short *portptr, int nports, u_short port,
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int range_flag));
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static int tcp6flg_match __P((struct tcphdr *tcp6, struct ip6_fw *f));
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static int icmp6type_match __P((struct icmp6_hdr * icmp, struct ip6_fw * f));
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static void ip6fw_report __P((struct ip6_fw *f, struct ip6_hdr *ip6,
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struct ifnet *rif, struct ifnet *oif, int off, int nxt));
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static int ip6_fw_chk __P((struct ip6_hdr **pip6,
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struct ifnet *oif, u_int16_t *cookie, struct mbuf **m));
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static int ip6_fw_ctl __P((int stage, struct mbuf **mm));
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static char err_prefix[] = "ip6_fw_ctl:";
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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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static
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__inline int
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port_match6(u_short *portptr, int nports, u_short port, int range_flag)
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{
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if (!nports)
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return 1;
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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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static int
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tcp6flg_match(struct tcphdr *tcp6, struct ip6_fw *f)
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{
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u_char flg_set, flg_clr;
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/*
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* If an established connection is required, reject packets that
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* have only SYN of RST|ACK|SYN set. Otherwise, fall through to
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* other flag requirements.
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*/
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if ((f->fw_ipflg & IPV6_FW_IF_TCPEST) &&
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((tcp6->th_flags & (IPV6_FW_TCPF_RST | IPV6_FW_TCPF_ACK |
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IPV6_FW_TCPF_SYN)) == IPV6_FW_TCPF_SYN))
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return 0;
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flg_set = tcp6->th_flags & f->fw_tcpf;
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flg_clr = tcp6->th_flags & f->fw_tcpnf;
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if (flg_set != f->fw_tcpf)
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return 0;
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if (flg_clr)
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return 0;
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return 1;
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}
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static int
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icmp6type_match(struct icmp6_hdr *icmp6, struct ip6_fw *f)
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{
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int type;
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if (!(f->fw_flg & IPV6_FW_F_ICMPBIT))
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return(1);
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type = icmp6->icmp6_type;
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/* check for matching type in the bitmap */
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if (type < IPV6_FW_ICMPTYPES_DIM * sizeof(unsigned) * 8 &&
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(f->fw_icmp6types[type / (sizeof(unsigned) * 8)] &
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(1U << (type % (8 * sizeof(unsigned))))))
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return(1);
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return(0); /* no match */
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}
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static int
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is_icmp6_query(struct ip6_hdr *ip6, int off)
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{
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const struct icmp6_hdr *icmp6;
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int icmp6_type;
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icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
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icmp6_type = icmp6->icmp6_type;
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if (icmp6_type == ICMP6_ECHO_REQUEST ||
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icmp6_type == ICMP6_MEMBERSHIP_QUERY ||
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icmp6_type == ICMP6_WRUREQUEST ||
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icmp6_type == ICMP6_FQDN_QUERY ||
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icmp6_type == ICMP6_NI_QUERY)
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return(1);
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return(0);
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}
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static int
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ip6opts_match(struct ip6_hdr **pip6, struct ip6_fw *f, struct mbuf **m,
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int *off, int *nxt, u_short *offset)
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{
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int len;
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struct ip6_hdr *ip6 = *pip6;
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struct ip6_ext *ip6e;
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u_char opts, nopts, nopts_sve;
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opts = f->fw_ip6opt;
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nopts = nopts_sve = f->fw_ip6nopt;
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*nxt = ip6->ip6_nxt;
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*off = sizeof(struct ip6_hdr);
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len = ntohs(ip6->ip6_plen) + sizeof(struct ip6_hdr);
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while (*off < len) {
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ip6e = (struct ip6_ext *)((caddr_t) ip6 + *off);
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if ((*m)->m_len < *off + sizeof(*ip6e))
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goto opts_check; /* XXX */
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switch(*nxt) {
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case IPPROTO_FRAGMENT:
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if ((*m)->m_len < *off + sizeof(struct ip6_frag)) {
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struct ip6_frag *ip6f;
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ip6f = (struct ip6_frag *) ((caddr_t)ip6 + *off);
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*offset = ip6f->ip6f_offlg | IP6F_OFF_MASK;
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}
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opts &= ~IPV6_FW_IP6OPT_FRAG;
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nopts &= ~IPV6_FW_IP6OPT_FRAG;
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*off += sizeof(struct ip6_frag);
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break;
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case IPPROTO_AH:
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opts &= ~IPV6_FW_IP6OPT_AH;
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nopts &= ~IPV6_FW_IP6OPT_AH;
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*off += (ip6e->ip6e_len + 2) << 2;
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break;
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default:
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switch (*nxt) {
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case IPPROTO_HOPOPTS:
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opts &= ~IPV6_FW_IP6OPT_HOPOPT;
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nopts &= ~IPV6_FW_IP6OPT_HOPOPT;
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break;
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case IPPROTO_ROUTING:
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opts &= ~IPV6_FW_IP6OPT_ROUTE;
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nopts &= ~IPV6_FW_IP6OPT_ROUTE;
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break;
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case IPPROTO_ESP:
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opts &= ~IPV6_FW_IP6OPT_ESP;
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nopts &= ~IPV6_FW_IP6OPT_ESP;
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break;
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case IPPROTO_NONE:
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opts &= ~IPV6_FW_IP6OPT_NONXT;
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nopts &= ~IPV6_FW_IP6OPT_NONXT;
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goto opts_check;
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break;
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case IPPROTO_DSTOPTS:
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opts &= ~IPV6_FW_IP6OPT_OPTS;
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nopts &= ~IPV6_FW_IP6OPT_OPTS;
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break;
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default:
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goto opts_check;
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break;
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}
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*off += (ip6e->ip6e_len + 1) << 3;
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break;
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}
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*nxt = ip6e->ip6e_nxt;
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}
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opts_check:
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if (f->fw_ip6opt == f->fw_ip6nopt) /* XXX */
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return 1;
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if (opts == 0 && nopts == nopts_sve)
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return 1;
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else
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return 0;
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}
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static
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__inline int
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iface_match(struct ifnet *ifp, union ip6_fw_if *ifu, int byname)
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{
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/* Check by name or by IP address */
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if (byname) {
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/* Check unit number (-1 is wildcard) */
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if (ifu->fu_via_if.unit != -1
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&& ifp->if_unit != ifu->fu_via_if.unit)
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return(0);
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/* Check name */
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if (strncmp(ifp->if_name, ifu->fu_via_if.name, IP6FW_IFNLEN))
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return(0);
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return(1);
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} else if (!IN6_IS_ADDR_UNSPECIFIED(&ifu->fu_via_ip6)) { /* Zero == wildcard */
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struct ifaddr *ia;
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for (ia = ifp->if_addrlist.tqh_first; ia; ia = ia->ifa_list.tqe_next)
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{
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if (ia->ifa_addr == NULL)
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continue;
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if (ia->ifa_addr->sa_family != AF_INET6)
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continue;
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if (!IN6_ARE_ADDR_EQUAL(&ifu->fu_via_ip6,
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&(((struct sockaddr_in6 *)
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(ia->ifa_addr))->sin6_addr)))
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continue;
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return(1);
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}
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return(0);
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}
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return(1);
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}
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static void
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ip6fw_report(struct ip6_fw *f, struct ip6_hdr *ip6,
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struct ifnet *rif, struct ifnet *oif, int off, int nxt)
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{
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static int counter;
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struct tcphdr *const tcp6 = (struct tcphdr *) ((caddr_t) ip6+ off);
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struct udphdr *const udp = (struct udphdr *) ((caddr_t) ip6+ off);
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struct icmp6_hdr *const icmp6 = (struct icmp6_hdr *) ((caddr_t) ip6+ off);
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int count;
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count = f ? f->fw_pcnt : ++counter;
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if (fw6_verbose_limit != 0 && count > fw6_verbose_limit)
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return;
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/* Print command name */
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printf("ip6fw: %d ", f ? f->fw_number : -1);
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if (!f)
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printf("Refuse");
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else
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switch (f->fw_flg & IPV6_FW_F_COMMAND) {
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case IPV6_FW_F_DENY:
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printf("Deny");
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break;
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case IPV6_FW_F_REJECT:
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if (f->fw_reject_code == IPV6_FW_REJECT_RST)
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printf("Reset");
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else
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printf("Unreach");
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break;
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case IPV6_FW_F_ACCEPT:
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printf("Accept");
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break;
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case IPV6_FW_F_COUNT:
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printf("Count");
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break;
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case IPV6_FW_F_DIVERT:
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printf("Divert %d", f->fw_divert_port);
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break;
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case IPV6_FW_F_TEE:
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printf("Tee %d", f->fw_divert_port);
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break;
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case IPV6_FW_F_SKIPTO:
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printf("SkipTo %d", f->fw_skipto_rule);
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break;
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default:
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printf("UNKNOWN");
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break;
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}
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printf(" ");
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switch (nxt) {
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case IPPROTO_TCP:
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printf("TCP ");
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print_ip6(&ip6->ip6_src);
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if (off > 0)
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printf(":%d ", ntohs(tcp6->th_sport));
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else
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printf(" ");
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print_ip6(&ip6->ip6_dst);
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if (off > 0)
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printf(":%d", ntohs(tcp6->th_dport));
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break;
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case IPPROTO_UDP:
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printf("UDP ");
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print_ip6(&ip6->ip6_src);
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if (off > 0)
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printf(":%d ", ntohs(udp->uh_sport));
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else
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printf(" ");
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print_ip6(&ip6->ip6_dst);
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if (off > 0)
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printf(":%d", ntohs(udp->uh_dport));
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break;
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case IPPROTO_ICMPV6:
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if (off > 0)
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printf("IPV6-ICMP:%u.%u ", icmp6->icmp6_type, icmp6->icmp6_code);
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else
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printf("IPV6-ICMP ");
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print_ip6(&ip6->ip6_src);
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printf(" ");
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print_ip6(&ip6->ip6_dst);
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break;
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default:
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printf("P:%d ", nxt);
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print_ip6(&ip6->ip6_src);
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printf(" ");
|
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print_ip6(&ip6->ip6_dst);
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break;
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}
|
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if (oif)
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printf(" out via %s", if_name(oif));
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else if (rif)
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printf(" in via %s", if_name(rif));
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printf("\n");
|
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if (fw6_verbose_limit != 0 && count == fw6_verbose_limit)
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printf("ip6fw: limit reached on rule #%d\n",
|
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f ? f->fw_number : -1);
|
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}
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|
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/*
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* Parameters:
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*
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* ip Pointer to packet header (struct ip6_hdr *)
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* hlen Packet header length
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* oif Outgoing interface, or NULL if packet is incoming
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* #ifndef IP6FW_DIVERT_RESTART
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* *cookie Ignore all divert/tee rules to this port (if non-zero)
|
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* #else
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* *cookie Skip up to the first rule past this rule number;
|
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* #endif
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* *m The packet; we set to NULL when/if we nuke it.
|
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*
|
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* Return value:
|
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*
|
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* 0 The packet is to be accepted and routed normally OR
|
|
* the packet was denied/rejected and has been dropped;
|
|
* in the latter case, *m is equal to NULL upon return.
|
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* port Divert the packet to port.
|
|
*/
|
|
|
|
static int
|
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ip6_fw_chk(struct ip6_hdr **pip6,
|
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struct ifnet *oif, u_int16_t *cookie, struct mbuf **m)
|
|
{
|
|
struct ip6_fw_chain *chain;
|
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struct ip6_fw *rule = NULL;
|
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struct ip6_hdr *ip6 = *pip6;
|
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struct ifnet *const rif = (*m)->m_pkthdr.rcvif;
|
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u_short offset = 0;
|
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int off = sizeof(struct ip6_hdr), nxt = ip6->ip6_nxt;
|
|
u_short src_port, dst_port;
|
|
#ifdef IP6FW_DIVERT_RESTART
|
|
u_int16_t skipto = *cookie;
|
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#else
|
|
u_int16_t ignport = ntohs(*cookie);
|
|
#endif
|
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|
|
*cookie = 0;
|
|
/*
|
|
* Go down the chain, looking for enlightment
|
|
* #ifdef IP6FW_DIVERT_RESTART
|
|
* If we've been asked to start at a given rule immediatly, do so.
|
|
* #endif
|
|
*/
|
|
chain = LIST_FIRST(&ip6_fw_chain);
|
|
#ifdef IP6FW_DIVERT_RESTART
|
|
if (skipto) {
|
|
if (skipto >= 65535)
|
|
goto dropit;
|
|
while (chain && (chain->rule->fw_number <= skipto)) {
|
|
chain = LIST_NEXT(chain, chain);
|
|
}
|
|
if (! chain) goto dropit;
|
|
}
|
|
#endif /* IP6FW_DIVERT_RESTART */
|
|
for (; chain; chain = LIST_NEXT(chain, chain)) {
|
|
register struct ip6_fw *const f = chain->rule;
|
|
|
|
if (oif) {
|
|
/* Check direction outbound */
|
|
if (!(f->fw_flg & IPV6_FW_F_OUT))
|
|
continue;
|
|
} else {
|
|
/* Check direction inbound */
|
|
if (!(f->fw_flg & IPV6_FW_F_IN))
|
|
continue;
|
|
}
|
|
|
|
#define IN6_ARE_ADDR_MASKEQUAL(x,y,z) (\
|
|
(((x)->s6_addr32[0] & (y)->s6_addr32[0]) == (z)->s6_addr32[0]) && \
|
|
(((x)->s6_addr32[1] & (y)->s6_addr32[1]) == (z)->s6_addr32[1]) && \
|
|
(((x)->s6_addr32[2] & (y)->s6_addr32[2]) == (z)->s6_addr32[2]) && \
|
|
(((x)->s6_addr32[3] & (y)->s6_addr32[3]) == (z)->s6_addr32[3]))
|
|
|
|
/* If src-addr doesn't match, not this rule. */
|
|
if (((f->fw_flg & IPV6_FW_F_INVSRC) != 0) ^
|
|
(!IN6_ARE_ADDR_MASKEQUAL(&ip6->ip6_src,&f->fw_smsk,&f->fw_src)))
|
|
continue;
|
|
|
|
/* If dest-addr doesn't match, not this rule. */
|
|
if (((f->fw_flg & IPV6_FW_F_INVDST) != 0) ^
|
|
(!IN6_ARE_ADDR_MASKEQUAL(&ip6->ip6_dst,&f->fw_dmsk,&f->fw_dst)))
|
|
continue;
|
|
|
|
#undef IN6_ARE_ADDR_MASKEQUAL
|
|
/* Interface check */
|
|
if ((f->fw_flg & IF6_FW_F_VIAHACK) == IF6_FW_F_VIAHACK) {
|
|
struct ifnet *const iface = oif ? oif : rif;
|
|
|
|
/* Backwards compatibility hack for "via" */
|
|
if (!iface || !iface_match(iface,
|
|
&f->fw_in_if, f->fw_flg & IPV6_FW_F_OIFNAME))
|
|
continue;
|
|
} else {
|
|
/* Check receive interface */
|
|
if ((f->fw_flg & IPV6_FW_F_IIFACE)
|
|
&& (!rif || !iface_match(rif,
|
|
&f->fw_in_if, f->fw_flg & IPV6_FW_F_IIFNAME)))
|
|
continue;
|
|
/* Check outgoing interface */
|
|
if ((f->fw_flg & IPV6_FW_F_OIFACE)
|
|
&& (!oif || !iface_match(oif,
|
|
&f->fw_out_if, f->fw_flg & IPV6_FW_F_OIFNAME)))
|
|
continue;
|
|
}
|
|
|
|
/* Check IP options */
|
|
if (!ip6opts_match(&ip6, f, m, &off, &nxt, &offset))
|
|
continue;
|
|
|
|
/* Fragments */
|
|
if ((f->fw_flg & IPV6_FW_F_FRAG) && !offset)
|
|
continue;
|
|
|
|
/* Check protocol; if wildcard, match */
|
|
if (f->fw_prot == IPPROTO_IPV6)
|
|
goto got_match;
|
|
|
|
/* If different, don't match */
|
|
if (nxt != f->fw_prot)
|
|
continue;
|
|
|
|
#define PULLUP_TO(len) do { \
|
|
if ((*m)->m_len < (len) \
|
|
&& (*m = m_pullup(*m, (len))) == 0) { \
|
|
goto dropit; \
|
|
} \
|
|
*pip6 = ip6 = mtod(*m, struct ip6_hdr *); \
|
|
} while (0)
|
|
|
|
/* Protocol specific checks */
|
|
switch (nxt) {
|
|
case IPPROTO_TCP:
|
|
{
|
|
struct tcphdr *tcp6;
|
|
|
|
if (offset == 1) { /* cf. RFC 1858 */
|
|
PULLUP_TO(off + 4); /* XXX ? */
|
|
goto bogusfrag;
|
|
}
|
|
if (offset != 0) {
|
|
/*
|
|
* TCP flags and ports aren't available in this
|
|
* packet -- if this rule specified either one,
|
|
* we consider the rule a non-match.
|
|
*/
|
|
if (f->fw_nports != 0 ||
|
|
f->fw_tcpf != f->fw_tcpnf)
|
|
continue;
|
|
|
|
break;
|
|
}
|
|
PULLUP_TO(off + 14);
|
|
tcp6 = (struct tcphdr *) ((caddr_t)ip6 + off);
|
|
if (((f->fw_tcpf != f->fw_tcpnf) ||
|
|
(f->fw_ipflg & IPV6_FW_IF_TCPEST)) &&
|
|
!tcp6flg_match(tcp6, f))
|
|
continue;
|
|
src_port = ntohs(tcp6->th_sport);
|
|
dst_port = ntohs(tcp6->th_dport);
|
|
goto check_ports;
|
|
}
|
|
|
|
case IPPROTO_UDP:
|
|
{
|
|
struct udphdr *udp;
|
|
|
|
if (offset != 0) {
|
|
/*
|
|
* Port specification is unavailable -- if this
|
|
* rule specifies a port, we consider the rule
|
|
* a non-match.
|
|
*/
|
|
if (f->fw_nports != 0)
|
|
continue;
|
|
|
|
break;
|
|
}
|
|
PULLUP_TO(off + 4);
|
|
udp = (struct udphdr *) ((caddr_t)ip6 + off);
|
|
src_port = ntohs(udp->uh_sport);
|
|
dst_port = ntohs(udp->uh_dport);
|
|
check_ports:
|
|
if (!port_match6(&f->fw_pts[0],
|
|
IPV6_FW_GETNSRCP(f), src_port,
|
|
f->fw_flg & IPV6_FW_F_SRNG))
|
|
continue;
|
|
if (!port_match6(&f->fw_pts[IPV6_FW_GETNSRCP(f)],
|
|
IPV6_FW_GETNDSTP(f), dst_port,
|
|
f->fw_flg & IPV6_FW_F_DRNG))
|
|
continue;
|
|
break;
|
|
}
|
|
|
|
case IPPROTO_ICMPV6:
|
|
{
|
|
struct icmp6_hdr *icmp;
|
|
|
|
if (offset != 0) /* Type isn't valid */
|
|
break;
|
|
PULLUP_TO(off + 2);
|
|
icmp = (struct icmp6_hdr *) ((caddr_t)ip6 + off);
|
|
if (!icmp6type_match(icmp, f))
|
|
continue;
|
|
break;
|
|
}
|
|
#undef PULLUP_TO
|
|
|
|
bogusfrag:
|
|
if (fw6_verbose)
|
|
ip6fw_report(NULL, ip6, rif, oif, off, nxt);
|
|
goto dropit;
|
|
}
|
|
|
|
got_match:
|
|
#ifndef IP6FW_DIVERT_RESTART
|
|
/* Ignore divert/tee rule if socket port is "ignport" */
|
|
switch (f->fw_flg & IPV6_FW_F_COMMAND) {
|
|
case IPV6_FW_F_DIVERT:
|
|
case IPV6_FW_F_TEE:
|
|
if (f->fw_divert_port == ignport)
|
|
continue; /* ignore this rule */
|
|
break;
|
|
}
|
|
|
|
#endif /* IP6FW_DIVERT_RESTART */
|
|
/* Update statistics */
|
|
f->fw_pcnt += 1;
|
|
f->fw_bcnt += ntohs(ip6->ip6_plen);
|
|
f->timestamp = time_second;
|
|
|
|
/* Log to console if desired */
|
|
if ((f->fw_flg & IPV6_FW_F_PRN) && fw6_verbose)
|
|
ip6fw_report(f, ip6, rif, oif, off, nxt);
|
|
|
|
/* Take appropriate action */
|
|
switch (f->fw_flg & IPV6_FW_F_COMMAND) {
|
|
case IPV6_FW_F_ACCEPT:
|
|
return(0);
|
|
case IPV6_FW_F_COUNT:
|
|
continue;
|
|
case IPV6_FW_F_DIVERT:
|
|
#ifdef IP6FW_DIVERT_RESTART
|
|
*cookie = f->fw_number;
|
|
#else
|
|
*cookie = htons(f->fw_divert_port);
|
|
#endif /* IP6FW_DIVERT_RESTART */
|
|
return(f->fw_divert_port);
|
|
case IPV6_FW_F_TEE:
|
|
/*
|
|
* XXX someday tee packet here, but beware that you
|
|
* can't use m_copym() or m_copypacket() because
|
|
* the divert input routine modifies the mbuf
|
|
* (and these routines only increment reference
|
|
* counts in the case of mbuf clusters), so need
|
|
* to write custom routine.
|
|
*/
|
|
continue;
|
|
case IPV6_FW_F_SKIPTO:
|
|
#ifdef DIAGNOSTIC
|
|
while (chain->chain.le_next
|
|
&& chain->chain.le_next->rule->fw_number
|
|
< f->fw_skipto_rule)
|
|
#else
|
|
while (chain->chain.le_next->rule->fw_number
|
|
< f->fw_skipto_rule)
|
|
#endif
|
|
chain = chain->chain.le_next;
|
|
continue;
|
|
}
|
|
|
|
/* Deny/reject this packet using this rule */
|
|
rule = f;
|
|
break;
|
|
}
|
|
|
|
#ifdef DIAGNOSTIC
|
|
/* Rule 65535 should always be there and should always match */
|
|
if (!chain)
|
|
panic("ip6_fw: chain");
|
|
#endif
|
|
|
|
/*
|
|
* At this point, we're going to drop the packet.
|
|
* Send a reject notice if all of the following are true:
|
|
*
|
|
* - The packet matched a reject rule
|
|
* - The packet is not an ICMP packet, or is an ICMP query packet
|
|
* - The packet is not a multicast or broadcast packet
|
|
*/
|
|
if ((rule->fw_flg & IPV6_FW_F_COMMAND) == IPV6_FW_F_REJECT
|
|
&& (nxt != IPPROTO_ICMPV6 || is_icmp6_query(ip6, off))
|
|
&& !((*m)->m_flags & (M_BCAST|M_MCAST))
|
|
&& !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
|
|
switch (rule->fw_reject_code) {
|
|
case IPV6_FW_REJECT_RST:
|
|
{
|
|
struct tcphdr *const tcp =
|
|
(struct tcphdr *) ((caddr_t)ip6 + off);
|
|
struct {
|
|
struct ip6_hdr ip6;
|
|
struct tcphdr th;
|
|
} ti;
|
|
tcp_seq ack, seq;
|
|
int flags;
|
|
|
|
if (offset != 0 || (tcp->th_flags & TH_RST))
|
|
break;
|
|
|
|
ti.ip6 = *ip6;
|
|
ti.th = *tcp;
|
|
NTOHL(ti.th.th_seq);
|
|
NTOHL(ti.th.th_ack);
|
|
ti.ip6.ip6_nxt = IPPROTO_TCP;
|
|
if (ti.th.th_flags & TH_ACK) {
|
|
ack = 0;
|
|
seq = ti.th.th_ack;
|
|
flags = TH_RST;
|
|
} else {
|
|
ack = ti.th.th_seq;
|
|
if (((*m)->m_flags & M_PKTHDR) != 0) {
|
|
ack += (*m)->m_pkthdr.len - off
|
|
- (ti.th.th_off << 2);
|
|
} else if (ip6->ip6_plen) {
|
|
ack += ntohs(ip6->ip6_plen) + sizeof(*ip6)
|
|
- off - (ti.th.th_off << 2);
|
|
} else {
|
|
m_freem(*m);
|
|
*m = 0;
|
|
break;
|
|
}
|
|
seq = 0;
|
|
flags = TH_RST|TH_ACK;
|
|
}
|
|
bcopy(&ti, ip6, sizeof(ti));
|
|
m_freem(*m);
|
|
*m = NULL;
|
|
break;
|
|
}
|
|
default: /* Send an ICMP unreachable using code */
|
|
if (oif)
|
|
(*m)->m_pkthdr.rcvif = oif;
|
|
icmp6_error(*m, ICMP6_DST_UNREACH,
|
|
rule->fw_reject_code, 0);
|
|
*m = NULL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
dropit:
|
|
/*
|
|
* Finally, drop the packet.
|
|
*/
|
|
if (*m) {
|
|
m_freem(*m);
|
|
*m = NULL;
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
static int
|
|
add_entry6(struct ip6_fw_head *chainptr, struct ip6_fw *frwl)
|
|
{
|
|
struct ip6_fw *ftmp = 0;
|
|
struct ip6_fw_chain *fwc = 0, *fcp, *fcpl = 0;
|
|
u_short nbr = 0;
|
|
int s;
|
|
|
|
fwc = malloc(sizeof *fwc, M_IP6FW, M_DONTWAIT);
|
|
ftmp = malloc(sizeof *ftmp, M_IP6FW, M_DONTWAIT);
|
|
if (!fwc || !ftmp) {
|
|
dprintf(("%s malloc said no\n", err_prefix));
|
|
if (fwc) free(fwc, M_IP6FW);
|
|
if (ftmp) free(ftmp, M_IP6FW);
|
|
return (ENOSPC);
|
|
}
|
|
|
|
bcopy(frwl, ftmp, sizeof(struct ip6_fw));
|
|
ftmp->fw_in_if.fu_via_if.name[IP6FW_IFNLEN - 1] = '\0';
|
|
ftmp->fw_pcnt = 0L;
|
|
ftmp->fw_bcnt = 0L;
|
|
fwc->rule = ftmp;
|
|
|
|
s = splnet();
|
|
|
|
if (!chainptr->lh_first) {
|
|
LIST_INSERT_HEAD(chainptr, fwc, chain);
|
|
splx(s);
|
|
return(0);
|
|
} else if (ftmp->fw_number == (u_short)-1) {
|
|
if (fwc) free(fwc, M_IP6FW);
|
|
if (ftmp) free(ftmp, M_IP6FW);
|
|
splx(s);
|
|
dprintf(("%s bad rule number\n", err_prefix));
|
|
return (EINVAL);
|
|
}
|
|
|
|
/* If entry number is 0, find highest numbered rule and add 100 */
|
|
if (ftmp->fw_number == 0) {
|
|
for (fcp = chainptr->lh_first; fcp; fcp = fcp->chain.le_next) {
|
|
if (fcp->rule->fw_number != (u_short)-1)
|
|
nbr = fcp->rule->fw_number;
|
|
else
|
|
break;
|
|
}
|
|
if (nbr < (u_short)-1 - 100)
|
|
nbr += 100;
|
|
ftmp->fw_number = nbr;
|
|
}
|
|
|
|
/* Got a valid number; now insert it, keeping the list ordered */
|
|
for (fcp = chainptr->lh_first; fcp; fcp = fcp->chain.le_next) {
|
|
if (fcp->rule->fw_number > ftmp->fw_number) {
|
|
if (fcpl) {
|
|
LIST_INSERT_AFTER(fcpl, fwc, chain);
|
|
} else {
|
|
LIST_INSERT_HEAD(chainptr, fwc, chain);
|
|
}
|
|
break;
|
|
} else {
|
|
fcpl = fcp;
|
|
}
|
|
}
|
|
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
del_entry6(struct ip6_fw_head *chainptr, u_short number)
|
|
{
|
|
struct ip6_fw_chain *fcp;
|
|
int s;
|
|
|
|
s = splnet();
|
|
|
|
fcp = chainptr->lh_first;
|
|
if (number != (u_short)-1) {
|
|
for (; fcp; fcp = fcp->chain.le_next) {
|
|
if (fcp->rule->fw_number == number) {
|
|
LIST_REMOVE(fcp, chain);
|
|
splx(s);
|
|
free(fcp->rule, M_IP6FW);
|
|
free(fcp, M_IP6FW);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
splx(s);
|
|
return (EINVAL);
|
|
}
|
|
|
|
static int
|
|
zero_entry6(struct mbuf *m)
|
|
{
|
|
struct ip6_fw *frwl;
|
|
struct ip6_fw_chain *fcp;
|
|
int s;
|
|
|
|
if (m && m->m_len != 0) {
|
|
if (m->m_len != sizeof(struct ip6_fw))
|
|
return(EINVAL);
|
|
frwl = mtod(m, struct ip6_fw *);
|
|
}
|
|
else
|
|
frwl = NULL;
|
|
|
|
/*
|
|
* It's possible to insert multiple chain entries with the
|
|
* same number, so we don't stop after finding the first
|
|
* match if zeroing a specific entry.
|
|
*/
|
|
s = splnet();
|
|
for (fcp = ip6_fw_chain.lh_first; fcp; fcp = fcp->chain.le_next)
|
|
if (!frwl || frwl->fw_number == fcp->rule->fw_number) {
|
|
fcp->rule->fw_bcnt = fcp->rule->fw_pcnt = 0;
|
|
fcp->rule->timestamp = 0;
|
|
}
|
|
splx(s);
|
|
|
|
if (fw6_verbose) {
|
|
if (frwl)
|
|
printf("ip6fw: Entry %d cleared.\n", frwl->fw_number);
|
|
else
|
|
printf("ip6fw: Accounting cleared.\n");
|
|
}
|
|
|
|
return(0);
|
|
}
|
|
|
|
static struct ip6_fw *
|
|
check_ip6fw_mbuf(struct mbuf *m)
|
|
{
|
|
/* Check length */
|
|
if (m->m_len != sizeof(struct ip6_fw)) {
|
|
dprintf(("%s len=%d, want %d\n", err_prefix, m->m_len,
|
|
sizeof(struct ip6_fw)));
|
|
return (NULL);
|
|
}
|
|
return(check_ip6fw_struct(mtod(m, struct ip6_fw *)));
|
|
}
|
|
|
|
static struct ip6_fw *
|
|
check_ip6fw_struct(struct ip6_fw *frwl)
|
|
{
|
|
/* Check for invalid flag bits */
|
|
if ((frwl->fw_flg & ~IPV6_FW_F_MASK) != 0) {
|
|
dprintf(("%s undefined flag bits set (flags=%x)\n",
|
|
err_prefix, frwl->fw_flg));
|
|
return (NULL);
|
|
}
|
|
/* Must apply to incoming or outgoing (or both) */
|
|
if (!(frwl->fw_flg & (IPV6_FW_F_IN | IPV6_FW_F_OUT))) {
|
|
dprintf(("%s neither in nor out\n", err_prefix));
|
|
return (NULL);
|
|
}
|
|
/* Empty interface name is no good */
|
|
if (((frwl->fw_flg & IPV6_FW_F_IIFNAME)
|
|
&& !*frwl->fw_in_if.fu_via_if.name)
|
|
|| ((frwl->fw_flg & IPV6_FW_F_OIFNAME)
|
|
&& !*frwl->fw_out_if.fu_via_if.name)) {
|
|
dprintf(("%s empty interface name\n", err_prefix));
|
|
return (NULL);
|
|
}
|
|
/* Sanity check interface matching */
|
|
if ((frwl->fw_flg & IF6_FW_F_VIAHACK) == IF6_FW_F_VIAHACK) {
|
|
; /* allow "via" backwards compatibility */
|
|
} else if ((frwl->fw_flg & IPV6_FW_F_IN)
|
|
&& (frwl->fw_flg & IPV6_FW_F_OIFACE)) {
|
|
dprintf(("%s outgoing interface check on incoming\n",
|
|
err_prefix));
|
|
return (NULL);
|
|
}
|
|
/* Sanity check port ranges */
|
|
if ((frwl->fw_flg & IPV6_FW_F_SRNG) && IPV6_FW_GETNSRCP(frwl) < 2) {
|
|
dprintf(("%s src range set but n_src_p=%d\n",
|
|
err_prefix, IPV6_FW_GETNSRCP(frwl)));
|
|
return (NULL);
|
|
}
|
|
if ((frwl->fw_flg & IPV6_FW_F_DRNG) && IPV6_FW_GETNDSTP(frwl) < 2) {
|
|
dprintf(("%s dst range set but n_dst_p=%d\n",
|
|
err_prefix, IPV6_FW_GETNDSTP(frwl)));
|
|
return (NULL);
|
|
}
|
|
if (IPV6_FW_GETNSRCP(frwl) + IPV6_FW_GETNDSTP(frwl) > IPV6_FW_MAX_PORTS) {
|
|
dprintf(("%s too many ports (%d+%d)\n",
|
|
err_prefix, IPV6_FW_GETNSRCP(frwl), IPV6_FW_GETNDSTP(frwl)));
|
|
return (NULL);
|
|
}
|
|
/*
|
|
* Protocols other than TCP/UDP don't use port range
|
|
*/
|
|
if ((frwl->fw_prot != IPPROTO_TCP) &&
|
|
(frwl->fw_prot != IPPROTO_UDP) &&
|
|
(IPV6_FW_GETNSRCP(frwl) || IPV6_FW_GETNDSTP(frwl))) {
|
|
dprintf(("%s port(s) specified for non TCP/UDP rule\n",
|
|
err_prefix));
|
|
return(NULL);
|
|
}
|
|
|
|
/*
|
|
* Rather than modify the entry to make such entries work,
|
|
* we reject this rule and require user level utilities
|
|
* to enforce whatever policy they deem appropriate.
|
|
*/
|
|
if ((frwl->fw_src.s6_addr32[0] & (~frwl->fw_smsk.s6_addr32[0])) ||
|
|
(frwl->fw_src.s6_addr32[1] & (~frwl->fw_smsk.s6_addr32[1])) ||
|
|
(frwl->fw_src.s6_addr32[2] & (~frwl->fw_smsk.s6_addr32[2])) ||
|
|
(frwl->fw_src.s6_addr32[3] & (~frwl->fw_smsk.s6_addr32[3])) ||
|
|
(frwl->fw_dst.s6_addr32[0] & (~frwl->fw_dmsk.s6_addr32[0])) ||
|
|
(frwl->fw_dst.s6_addr32[1] & (~frwl->fw_dmsk.s6_addr32[1])) ||
|
|
(frwl->fw_dst.s6_addr32[2] & (~frwl->fw_dmsk.s6_addr32[2])) ||
|
|
(frwl->fw_dst.s6_addr32[3] & (~frwl->fw_dmsk.s6_addr32[3]))) {
|
|
dprintf(("%s rule never matches\n", err_prefix));
|
|
return(NULL);
|
|
}
|
|
|
|
if ((frwl->fw_flg & IPV6_FW_F_FRAG) &&
|
|
(frwl->fw_prot == IPPROTO_UDP || frwl->fw_prot == IPPROTO_TCP)) {
|
|
if (frwl->fw_nports) {
|
|
dprintf(("%s cannot mix 'frag' and ports\n", err_prefix));
|
|
return(NULL);
|
|
}
|
|
if (frwl->fw_prot == IPPROTO_TCP &&
|
|
frwl->fw_tcpf != frwl->fw_tcpnf) {
|
|
dprintf(("%s cannot mix 'frag' with TCP flags\n", err_prefix));
|
|
return(NULL);
|
|
}
|
|
}
|
|
|
|
/* Check command specific stuff */
|
|
switch (frwl->fw_flg & IPV6_FW_F_COMMAND)
|
|
{
|
|
case IPV6_FW_F_REJECT:
|
|
if (frwl->fw_reject_code >= 0x100
|
|
&& !(frwl->fw_prot == IPPROTO_TCP
|
|
&& frwl->fw_reject_code == IPV6_FW_REJECT_RST)) {
|
|
dprintf(("%s unknown reject code\n", err_prefix));
|
|
return(NULL);
|
|
}
|
|
break;
|
|
case IPV6_FW_F_DIVERT: /* Diverting to port zero is invalid */
|
|
case IPV6_FW_F_TEE:
|
|
if (frwl->fw_divert_port == 0) {
|
|
dprintf(("%s can't divert to port 0\n", err_prefix));
|
|
return (NULL);
|
|
}
|
|
break;
|
|
case IPV6_FW_F_DENY:
|
|
case IPV6_FW_F_ACCEPT:
|
|
case IPV6_FW_F_COUNT:
|
|
case IPV6_FW_F_SKIPTO:
|
|
break;
|
|
default:
|
|
dprintf(("%s invalid command\n", err_prefix));
|
|
return(NULL);
|
|
}
|
|
|
|
return frwl;
|
|
}
|
|
|
|
static int
|
|
ip6_fw_ctl(int stage, struct mbuf **mm)
|
|
{
|
|
int error;
|
|
struct mbuf *m;
|
|
|
|
if (stage == IPV6_FW_GET) {
|
|
struct ip6_fw_chain *fcp = ip6_fw_chain.lh_first;
|
|
*mm = m = m_get(M_TRYWAIT, MT_DATA); /* XXX */
|
|
if (!m)
|
|
return(ENOBUFS);
|
|
if (sizeof *(fcp->rule) > MLEN) {
|
|
MCLGET(m, M_TRYWAIT);
|
|
if ((m->m_flags & M_EXT) == 0) {
|
|
m_free(m);
|
|
return(ENOBUFS);
|
|
}
|
|
}
|
|
for (; fcp; fcp = fcp->chain.le_next) {
|
|
memcpy(m->m_data, fcp->rule, sizeof *(fcp->rule));
|
|
m->m_len = sizeof *(fcp->rule);
|
|
m->m_next = m_get(M_TRYWAIT, MT_DATA); /* XXX */
|
|
if (!m->m_next) {
|
|
m_freem(*mm);
|
|
return(ENOBUFS);
|
|
}
|
|
m = m->m_next;
|
|
if (sizeof *(fcp->rule) > MLEN) {
|
|
MCLGET(m, M_TRYWAIT);
|
|
if ((m->m_flags & M_EXT) == 0) {
|
|
m_freem(*mm);
|
|
return(ENOBUFS);
|
|
}
|
|
}
|
|
m->m_len = 0;
|
|
}
|
|
return (0);
|
|
}
|
|
m = *mm;
|
|
/* only allow get calls if secure mode > 2 */
|
|
if (securelevel > 2) {
|
|
if (m) {
|
|
(void)m_freem(m);
|
|
*mm = 0;
|
|
}
|
|
return(EPERM);
|
|
}
|
|
if (stage == IPV6_FW_FLUSH) {
|
|
while (ip6_fw_chain.lh_first != NULL &&
|
|
ip6_fw_chain.lh_first->rule->fw_number != (u_short)-1) {
|
|
struct ip6_fw_chain *fcp = ip6_fw_chain.lh_first;
|
|
int s = splnet();
|
|
LIST_REMOVE(ip6_fw_chain.lh_first, chain);
|
|
splx(s);
|
|
free(fcp->rule, M_IP6FW);
|
|
free(fcp, M_IP6FW);
|
|
}
|
|
if (m) {
|
|
(void)m_freem(m);
|
|
*mm = 0;
|
|
}
|
|
return (0);
|
|
}
|
|
if (stage == IPV6_FW_ZERO) {
|
|
error = zero_entry6(m);
|
|
if (m) {
|
|
(void)m_freem(m);
|
|
*mm = 0;
|
|
}
|
|
return (error);
|
|
}
|
|
if (m == NULL) {
|
|
printf("%s NULL mbuf ptr\n", err_prefix);
|
|
return (EINVAL);
|
|
}
|
|
|
|
if (stage == IPV6_FW_ADD) {
|
|
struct ip6_fw *frwl = check_ip6fw_mbuf(m);
|
|
|
|
if (!frwl)
|
|
error = EINVAL;
|
|
else
|
|
error = add_entry6(&ip6_fw_chain, frwl);
|
|
if (m) {
|
|
(void)m_freem(m);
|
|
*mm = 0;
|
|
}
|
|
return error;
|
|
}
|
|
if (stage == IPV6_FW_DEL) {
|
|
if (m->m_len != sizeof(struct ip6_fw)) {
|
|
dprintf(("%s len=%d, want %d\n", err_prefix, m->m_len,
|
|
sizeof(struct ip6_fw)));
|
|
error = EINVAL;
|
|
} else if (mtod(m, struct ip6_fw *)->fw_number == (u_short)-1) {
|
|
dprintf(("%s can't delete rule 65535\n", err_prefix));
|
|
error = EINVAL;
|
|
} else
|
|
error = del_entry6(&ip6_fw_chain,
|
|
mtod(m, struct ip6_fw *)->fw_number);
|
|
if (m) {
|
|
(void)m_freem(m);
|
|
*mm = 0;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
dprintf(("%s unknown request %d\n", err_prefix, stage));
|
|
if (m) {
|
|
(void)m_freem(m);
|
|
*mm = 0;
|
|
}
|
|
return (EINVAL);
|
|
}
|
|
|
|
void
|
|
ip6_fw_init(void)
|
|
{
|
|
struct ip6_fw default_rule;
|
|
|
|
ip6_fw_chk_ptr = ip6_fw_chk;
|
|
ip6_fw_ctl_ptr = ip6_fw_ctl;
|
|
LIST_INIT(&ip6_fw_chain);
|
|
|
|
bzero(&default_rule, sizeof default_rule);
|
|
default_rule.fw_prot = IPPROTO_IPV6;
|
|
default_rule.fw_number = (u_short)-1;
|
|
#ifdef IPV6FIREWALL_DEFAULT_TO_ACCEPT
|
|
default_rule.fw_flg |= IPV6_FW_F_ACCEPT;
|
|
#else
|
|
default_rule.fw_flg |= IPV6_FW_F_DENY;
|
|
#endif
|
|
default_rule.fw_flg |= IPV6_FW_F_IN | IPV6_FW_F_OUT;
|
|
if (check_ip6fw_struct(&default_rule) == NULL ||
|
|
add_entry6(&ip6_fw_chain, &default_rule))
|
|
panic(__FUNCTION__);
|
|
|
|
printf("IPv6 packet filtering initialized, ");
|
|
#ifdef IPV6FIREWALL_DEFAULT_TO_ACCEPT
|
|
printf("default to accept, ");
|
|
#endif
|
|
#ifndef IPV6FIREWALL_VERBOSE
|
|
printf("logging disabled\n");
|
|
#else
|
|
if (fw6_verbose_limit == 0)
|
|
printf("unlimited logging\n");
|
|
else
|
|
printf("logging limited to %d packets/entry\n",
|
|
fw6_verbose_limit);
|
|
#endif
|
|
}
|
|
|
|
static ip6_fw_chk_t *old_chk_ptr;
|
|
static ip6_fw_ctl_t *old_ctl_ptr;
|
|
|
|
static int
|
|
ip6fw_modevent(module_t mod, int type, void *unused)
|
|
{
|
|
int s;
|
|
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
s = splnet();
|
|
|
|
old_chk_ptr = ip6_fw_chk_ptr;
|
|
old_ctl_ptr = ip6_fw_ctl_ptr;
|
|
|
|
ip6_fw_init();
|
|
splx(s);
|
|
return 0;
|
|
case MOD_UNLOAD:
|
|
s = splnet();
|
|
ip6_fw_chk_ptr = old_chk_ptr;
|
|
ip6_fw_ctl_ptr = old_ctl_ptr;
|
|
while (LIST_FIRST(&ip6_fw_chain) != NULL) {
|
|
struct ip6_fw_chain *fcp = LIST_FIRST(&ip6_fw_chain);
|
|
LIST_REMOVE(LIST_FIRST(&ip6_fw_chain), chain);
|
|
free(fcp->rule, M_IP6FW);
|
|
free(fcp, M_IP6FW);
|
|
}
|
|
|
|
splx(s);
|
|
printf("IPv6 firewall unloaded\n");
|
|
return 0;
|
|
default:
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static moduledata_t ip6fwmod = {
|
|
"ip6fw",
|
|
ip6fw_modevent,
|
|
0
|
|
};
|
|
DECLARE_MODULE(ip6fw, ip6fwmod, SI_SUB_PSEUDO, SI_ORDER_ANY);
|