567 lines
14 KiB
C
567 lines
14 KiB
C
/*-
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* Copyright (c) 2002-2009 Luigi Rizzo, Universita` di Pisa
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Logging support for ipfw
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*/
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#include "opt_ipfw.h"
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#include "opt_inet.h"
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#ifndef INET
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#error IPFIREWALL requires INET.
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#endif /* INET */
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/kernel.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <sys/lock.h>
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#include <sys/rwlock.h>
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#include <net/ethernet.h> /* for ETHERTYPE_IP */
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_clone.h>
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#include <net/vnet.h>
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#include <net/if_types.h> /* for IFT_PFLOG */
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#include <net/bpf.h> /* for BPF */
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/ip_icmp.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_fw.h>
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#include <netinet/tcp_var.h>
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#include <netinet/udp.h>
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#include <netinet/ip6.h>
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#include <netinet/icmp6.h>
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#ifdef INET6
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#include <netinet6/in6_var.h> /* ip6_sprintf() */
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#endif
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#include <netpfil/ipfw/ip_fw_private.h>
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#ifdef MAC
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#include <security/mac/mac_framework.h>
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#endif
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/*
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* L3HDR maps an ipv4 pointer into a layer3 header pointer of type T
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* Other macros just cast void * into the appropriate type
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*/
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#define L3HDR(T, ip) ((T *)((u_int32_t *)(ip) + (ip)->ip_hl))
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#define TCP(p) ((struct tcphdr *)(p))
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#define SCTP(p) ((struct sctphdr *)(p))
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#define UDP(p) ((struct udphdr *)(p))
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#define ICMP(p) ((struct icmphdr *)(p))
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#define ICMP6(p) ((struct icmp6_hdr *)(p))
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#ifdef __APPLE__
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#undef snprintf
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#define snprintf sprintf
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#define SNPARGS(buf, len) buf + len
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#define SNP(buf) buf
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#else /* !__APPLE__ */
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#define SNPARGS(buf, len) buf + len, sizeof(buf) > len ? sizeof(buf) - len : 0
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#define SNP(buf) buf, sizeof(buf)
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#endif /* !__APPLE__ */
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#ifdef WITHOUT_BPF
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void
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ipfw_log_bpf(int onoff)
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{
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}
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#else /* !WITHOUT_BPF */
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static struct ifnet *log_if; /* hook to attach to bpf */
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static struct rwlock log_if_lock;
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#define LOGIF_LOCK_INIT(x) rw_init(&log_if_lock, "ipfw log_if lock")
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#define LOGIF_LOCK_DESTROY(x) rw_destroy(&log_if_lock)
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#define LOGIF_RLOCK(x) rw_rlock(&log_if_lock)
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#define LOGIF_RUNLOCK(x) rw_runlock(&log_if_lock)
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#define LOGIF_WLOCK(x) rw_wlock(&log_if_lock)
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#define LOGIF_WUNLOCK(x) rw_wunlock(&log_if_lock)
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static const char ipfwname[] = "ipfw";
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/* we use this dummy function for all ifnet callbacks */
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static int
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log_dummy(struct ifnet *ifp, u_long cmd, caddr_t addr)
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{
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return EINVAL;
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}
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static int
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ipfw_log_output(struct ifnet *ifp, struct mbuf *m,
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const struct sockaddr *dst, struct route *ro)
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{
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if (m != NULL)
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FREE_PKT(m);
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return EINVAL;
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}
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static void
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ipfw_log_start(struct ifnet* ifp)
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{
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panic("ipfw_log_start() must not be called");
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}
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static const u_char ipfwbroadcastaddr[6] =
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
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static int
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ipfw_log_clone_match(struct if_clone *ifc, const char *name)
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{
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return (strncmp(name, ipfwname, sizeof(ipfwname) - 1) == 0);
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}
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static int
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ipfw_log_clone_create(struct if_clone *ifc, char *name, size_t len,
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caddr_t params)
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{
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int error;
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int unit;
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struct ifnet *ifp;
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error = ifc_name2unit(name, &unit);
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if (error)
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return (error);
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error = ifc_alloc_unit(ifc, &unit);
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if (error)
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return (error);
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ifp = if_alloc(IFT_PFLOG);
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if (ifp == NULL) {
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ifc_free_unit(ifc, unit);
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return (ENOSPC);
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}
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ifp->if_dname = ipfwname;
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ifp->if_dunit = unit;
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snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", ipfwname, unit);
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strlcpy(name, ifp->if_xname, len);
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ifp->if_mtu = 65536;
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ifp->if_flags = IFF_UP | IFF_SIMPLEX | IFF_MULTICAST;
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ifp->if_init = (void *)log_dummy;
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ifp->if_ioctl = log_dummy;
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ifp->if_start = ipfw_log_start;
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ifp->if_output = ipfw_log_output;
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ifp->if_addrlen = 6;
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ifp->if_hdrlen = 14;
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ifp->if_broadcastaddr = ipfwbroadcastaddr;
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ifp->if_baudrate = IF_Mbps(10);
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LOGIF_WLOCK();
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if (log_if == NULL)
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log_if = ifp;
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else {
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LOGIF_WUNLOCK();
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if_free(ifp);
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ifc_free_unit(ifc, unit);
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return (EEXIST);
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}
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LOGIF_WUNLOCK();
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if_attach(ifp);
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bpfattach(ifp, DLT_EN10MB, 14);
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return (0);
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}
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static int
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ipfw_log_clone_destroy(struct if_clone *ifc, struct ifnet *ifp)
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{
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int unit;
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if (ifp == NULL)
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return (0);
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LOGIF_WLOCK();
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if (log_if != NULL && ifp == log_if)
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log_if = NULL;
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else {
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LOGIF_WUNLOCK();
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return (EINVAL);
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}
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LOGIF_WUNLOCK();
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unit = ifp->if_dunit;
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bpfdetach(ifp);
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if_detach(ifp);
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if_free(ifp);
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ifc_free_unit(ifc, unit);
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return (0);
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}
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static struct if_clone *ipfw_log_cloner;
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void
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ipfw_log_bpf(int onoff)
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{
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if (onoff) {
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LOGIF_LOCK_INIT();
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ipfw_log_cloner = if_clone_advanced(ipfwname, 0,
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ipfw_log_clone_match, ipfw_log_clone_create,
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ipfw_log_clone_destroy);
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} else {
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if_clone_detach(ipfw_log_cloner);
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LOGIF_LOCK_DESTROY();
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}
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}
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#endif /* !WITHOUT_BPF */
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/*
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* We enter here when we have a rule with O_LOG.
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* XXX this function alone takes about 2Kbytes of code!
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*/
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void
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ipfw_log(struct ip_fw *f, u_int hlen, struct ip_fw_args *args,
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struct mbuf *m, struct ifnet *oif, u_short offset, uint32_t tablearg,
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struct ip *ip)
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{
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char *action;
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int limit_reached = 0;
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char action2[92], proto[128], fragment[32];
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if (V_fw_verbose == 0) {
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#ifndef WITHOUT_BPF
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LOGIF_RLOCK();
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if (log_if == NULL || log_if->if_bpf == NULL) {
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LOGIF_RUNLOCK();
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return;
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}
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if (args->eh) /* layer2, use orig hdr */
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BPF_MTAP2(log_if, args->eh, ETHER_HDR_LEN, m);
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else {
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/* Add fake header. Later we will store
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* more info in the header.
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*/
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if (ip->ip_v == 4)
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BPF_MTAP2(log_if, "DDDDDDSSSSSS\x08\x00", ETHER_HDR_LEN, m);
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else if (ip->ip_v == 6)
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BPF_MTAP2(log_if, "DDDDDDSSSSSS\x86\xdd", ETHER_HDR_LEN, m);
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else
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/* Obviously bogus EtherType. */
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BPF_MTAP2(log_if, "DDDDDDSSSSSS\xff\xff", ETHER_HDR_LEN, m);
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}
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LOGIF_RUNLOCK();
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#endif /* !WITHOUT_BPF */
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return;
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}
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/* the old 'log' function */
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fragment[0] = '\0';
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proto[0] = '\0';
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if (f == NULL) { /* bogus pkt */
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if (V_verbose_limit != 0 && V_norule_counter >= V_verbose_limit)
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return;
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V_norule_counter++;
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if (V_norule_counter == V_verbose_limit)
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limit_reached = V_verbose_limit;
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action = "Refuse";
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} else { /* O_LOG is the first action, find the real one */
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ipfw_insn *cmd = ACTION_PTR(f);
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ipfw_insn_log *l = (ipfw_insn_log *)cmd;
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if (l->max_log != 0 && l->log_left == 0)
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return;
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l->log_left--;
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if (l->log_left == 0)
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limit_reached = l->max_log;
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cmd += F_LEN(cmd); /* point to first action */
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if (cmd->opcode == O_ALTQ) {
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ipfw_insn_altq *altq = (ipfw_insn_altq *)cmd;
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snprintf(SNPARGS(action2, 0), "Altq %d",
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altq->qid);
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cmd += F_LEN(cmd);
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}
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if (cmd->opcode == O_PROB || cmd->opcode == O_TAG ||
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cmd->opcode == O_SETDSCP)
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cmd += F_LEN(cmd);
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action = action2;
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switch (cmd->opcode) {
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case O_DENY:
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action = "Deny";
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break;
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case O_REJECT:
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if (cmd->arg1==ICMP_REJECT_RST)
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action = "Reset";
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else if (cmd->arg1==ICMP_UNREACH_HOST)
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action = "Reject";
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else
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snprintf(SNPARGS(action2, 0), "Unreach %d",
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cmd->arg1);
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break;
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case O_UNREACH6:
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if (cmd->arg1==ICMP6_UNREACH_RST)
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action = "Reset";
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else
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snprintf(SNPARGS(action2, 0), "Unreach %d",
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cmd->arg1);
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break;
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case O_ACCEPT:
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action = "Accept";
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break;
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case O_COUNT:
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action = "Count";
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break;
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case O_DIVERT:
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snprintf(SNPARGS(action2, 0), "Divert %d",
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cmd->arg1);
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break;
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case O_TEE:
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snprintf(SNPARGS(action2, 0), "Tee %d",
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cmd->arg1);
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break;
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case O_SETFIB:
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snprintf(SNPARGS(action2, 0), "SetFib %d",
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IP_FW_ARG_TABLEARG(cmd->arg1));
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break;
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case O_SKIPTO:
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snprintf(SNPARGS(action2, 0), "SkipTo %d",
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IP_FW_ARG_TABLEARG(cmd->arg1));
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break;
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case O_PIPE:
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snprintf(SNPARGS(action2, 0), "Pipe %d",
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IP_FW_ARG_TABLEARG(cmd->arg1));
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break;
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case O_QUEUE:
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snprintf(SNPARGS(action2, 0), "Queue %d",
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IP_FW_ARG_TABLEARG(cmd->arg1));
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break;
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case O_FORWARD_IP: {
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ipfw_insn_sa *sa = (ipfw_insn_sa *)cmd;
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int len;
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struct in_addr dummyaddr;
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if (sa->sa.sin_addr.s_addr == INADDR_ANY)
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dummyaddr.s_addr = htonl(tablearg);
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else
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dummyaddr.s_addr = sa->sa.sin_addr.s_addr;
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len = snprintf(SNPARGS(action2, 0), "Forward to %s",
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inet_ntoa(dummyaddr));
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if (sa->sa.sin_port)
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snprintf(SNPARGS(action2, len), ":%d",
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sa->sa.sin_port);
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}
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break;
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#ifdef INET6
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case O_FORWARD_IP6: {
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char buf[INET6_ADDRSTRLEN];
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ipfw_insn_sa6 *sa = (ipfw_insn_sa6 *)cmd;
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int len;
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len = snprintf(SNPARGS(action2, 0), "Forward to [%s]",
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ip6_sprintf(buf, &sa->sa.sin6_addr));
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if (sa->sa.sin6_port)
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snprintf(SNPARGS(action2, len), ":%u",
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sa->sa.sin6_port);
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}
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break;
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#endif
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case O_NETGRAPH:
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snprintf(SNPARGS(action2, 0), "Netgraph %d",
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cmd->arg1);
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break;
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case O_NGTEE:
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snprintf(SNPARGS(action2, 0), "Ngtee %d",
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cmd->arg1);
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break;
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case O_NAT:
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action = "Nat";
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break;
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case O_REASS:
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action = "Reass";
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break;
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case O_CALLRETURN:
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if (cmd->len & F_NOT)
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action = "Return";
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else
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snprintf(SNPARGS(action2, 0), "Call %d",
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cmd->arg1);
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break;
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default:
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action = "UNKNOWN";
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break;
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}
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}
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if (hlen == 0) { /* non-ip */
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snprintf(SNPARGS(proto, 0), "MAC");
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} else {
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int len;
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#ifdef INET6
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char src[INET6_ADDRSTRLEN + 2], dst[INET6_ADDRSTRLEN + 2];
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#else
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char src[INET_ADDRSTRLEN], dst[INET_ADDRSTRLEN];
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#endif
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struct icmphdr *icmp;
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struct tcphdr *tcp;
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struct udphdr *udp;
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#ifdef INET6
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struct ip6_hdr *ip6 = NULL;
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struct icmp6_hdr *icmp6;
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u_short ip6f_mf;
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#endif
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src[0] = '\0';
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dst[0] = '\0';
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#ifdef INET6
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ip6f_mf = offset & IP6F_MORE_FRAG;
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offset &= IP6F_OFF_MASK;
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if (IS_IP6_FLOW_ID(&(args->f_id))) {
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char ip6buf[INET6_ADDRSTRLEN];
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snprintf(src, sizeof(src), "[%s]",
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ip6_sprintf(ip6buf, &args->f_id.src_ip6));
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snprintf(dst, sizeof(dst), "[%s]",
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ip6_sprintf(ip6buf, &args->f_id.dst_ip6));
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ip6 = (struct ip6_hdr *)ip;
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tcp = (struct tcphdr *)(((char *)ip) + hlen);
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udp = (struct udphdr *)(((char *)ip) + hlen);
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} else
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#endif
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{
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tcp = L3HDR(struct tcphdr, ip);
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udp = L3HDR(struct udphdr, ip);
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inet_ntop(AF_INET, &ip->ip_src, src, sizeof(src));
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inet_ntop(AF_INET, &ip->ip_dst, dst, sizeof(dst));
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}
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switch (args->f_id.proto) {
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case IPPROTO_TCP:
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len = snprintf(SNPARGS(proto, 0), "TCP %s", src);
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if (offset == 0)
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snprintf(SNPARGS(proto, len), ":%d %s:%d",
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ntohs(tcp->th_sport),
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dst,
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ntohs(tcp->th_dport));
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else
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snprintf(SNPARGS(proto, len), " %s", dst);
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break;
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case IPPROTO_UDP:
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len = snprintf(SNPARGS(proto, 0), "UDP %s", src);
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if (offset == 0)
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snprintf(SNPARGS(proto, len), ":%d %s:%d",
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ntohs(udp->uh_sport),
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dst,
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ntohs(udp->uh_dport));
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else
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snprintf(SNPARGS(proto, len), " %s", dst);
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break;
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case IPPROTO_ICMP:
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icmp = L3HDR(struct icmphdr, ip);
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if (offset == 0)
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|
len = snprintf(SNPARGS(proto, 0),
|
|
"ICMP:%u.%u ",
|
|
icmp->icmp_type, icmp->icmp_code);
|
|
else
|
|
len = snprintf(SNPARGS(proto, 0), "ICMP ");
|
|
len += snprintf(SNPARGS(proto, len), "%s", src);
|
|
snprintf(SNPARGS(proto, len), " %s", dst);
|
|
break;
|
|
#ifdef INET6
|
|
case IPPROTO_ICMPV6:
|
|
icmp6 = (struct icmp6_hdr *)(((char *)ip) + hlen);
|
|
if (offset == 0)
|
|
len = snprintf(SNPARGS(proto, 0),
|
|
"ICMPv6:%u.%u ",
|
|
icmp6->icmp6_type, icmp6->icmp6_code);
|
|
else
|
|
len = snprintf(SNPARGS(proto, 0), "ICMPv6 ");
|
|
len += snprintf(SNPARGS(proto, len), "%s", src);
|
|
snprintf(SNPARGS(proto, len), " %s", dst);
|
|
break;
|
|
#endif
|
|
default:
|
|
len = snprintf(SNPARGS(proto, 0), "P:%d %s",
|
|
args->f_id.proto, src);
|
|
snprintf(SNPARGS(proto, len), " %s", dst);
|
|
break;
|
|
}
|
|
|
|
#ifdef INET6
|
|
if (IS_IP6_FLOW_ID(&(args->f_id))) {
|
|
if (offset & (IP6F_OFF_MASK | IP6F_MORE_FRAG))
|
|
snprintf(SNPARGS(fragment, 0),
|
|
" (frag %08x:%d@%d%s)",
|
|
args->f_id.extra,
|
|
ntohs(ip6->ip6_plen) - hlen,
|
|
ntohs(offset) << 3, ip6f_mf ? "+" : "");
|
|
} else
|
|
#endif
|
|
{
|
|
int ipoff, iplen;
|
|
ipoff = ntohs(ip->ip_off);
|
|
iplen = ntohs(ip->ip_len);
|
|
if (ipoff & (IP_MF | IP_OFFMASK))
|
|
snprintf(SNPARGS(fragment, 0),
|
|
" (frag %d:%d@%d%s)",
|
|
ntohs(ip->ip_id), iplen - (ip->ip_hl << 2),
|
|
offset << 3,
|
|
(ipoff & IP_MF) ? "+" : "");
|
|
}
|
|
}
|
|
#ifdef __FreeBSD__
|
|
if (oif || m->m_pkthdr.rcvif)
|
|
log(LOG_SECURITY | LOG_INFO,
|
|
"ipfw: %d %s %s %s via %s%s\n",
|
|
f ? f->rulenum : -1,
|
|
action, proto, oif ? "out" : "in",
|
|
oif ? oif->if_xname : m->m_pkthdr.rcvif->if_xname,
|
|
fragment);
|
|
else
|
|
#endif
|
|
log(LOG_SECURITY | LOG_INFO,
|
|
"ipfw: %d %s %s [no if info]%s\n",
|
|
f ? f->rulenum : -1,
|
|
action, proto, fragment);
|
|
if (limit_reached)
|
|
log(LOG_SECURITY | LOG_NOTICE,
|
|
"ipfw: limit %d reached on entry %d\n",
|
|
limit_reached, f ? f->rulenum : -1);
|
|
}
|
|
/* end of file */
|