830c6e2b97
r201011 - move most of ng_ipfw.h into ip_fw_private.h, as this code is ipfw-specific. This removes a dependency on ng_ipfw.h from some files. - move many equivalent definitions of direction (IN, OUT) for reinjected packets into ip_fw_private.h - document the structure of the packet tags used for dummynet and netgraph; r201049 - merge some common code to attach/detach hooks into a single function. r201055 - remove some duplicated code in ip_fw_pfil. The input and output processing uses almost exactly the same code so there is no need to use two separate hooks. ip_fw_pfil.o goes from 2096 to 1382 bytes of .text r201057 (see the svn log for full details) - macros to make the conversion of ip_len and ip_off between host and network format more explicit r201113 (the remaining parts) - readability fixes -- put braces around some large for() blocks, localize variables so the compiler does not think they are uninitialized, do not insist on precise allocation size if we have more than we need. r201119 - when doing a lookup, keys must be in big endian format because this is what the radix code expects (this fixes a bug in the recently-introduced 'lookup' option) No ABI changes in this commit. MFC after: 1 week
449 lines
11 KiB
C
449 lines
11 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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#if !defined(KLD_MODULE)
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#include "opt_ipfw.h"
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#include "opt_ipdivert.h"
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#include "opt_ipdn.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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#endif
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#include "opt_inet6.h"
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#include "opt_ipsec.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 <net/ethernet.h> /* for ETHERTYPE_IP */
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#include <net/if.h>
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#include <net/vnet.h>
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#include <net/if_types.h> /* for IFT_ETHER */
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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_fw.h>
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#include <netinet/ipfw/ip_fw_private.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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#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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#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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#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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/* 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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void
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ipfw_log_bpf(int onoff)
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{
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struct ifnet *ifp;
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if (onoff) {
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if (log_if)
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return;
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ifp = if_alloc(IFT_ETHER);
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if (ifp == NULL)
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return;
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if_initname(ifp, "ipfw", 0);
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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 = (void *)log_dummy;
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ifp->if_output = (void *)log_dummy;
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ifp->if_addrlen = 6;
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ifp->if_hdrlen = 14;
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if_attach(ifp);
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ifp->if_baudrate = IF_Mbps(10);
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bpfattach(ifp, DLT_EN10MB, 14);
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log_if = ifp;
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} else {
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if (log_if) {
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ether_ifdetach(log_if);
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if_free(log_if);
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}
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log_if = NULL;
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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[40], proto[128], fragment[32];
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if (V_fw_verbose == 0) {
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#ifndef WITHOUT_BPF
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struct m_hdr mh;
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if (log_if == NULL || log_if->if_bpf == NULL)
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return;
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/* BPF treats the "mbuf" as read-only */
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mh.mh_next = m;
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mh.mh_len = ETHER_HDR_LEN;
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if (args->eh) { /* layer2, use orig hdr */
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mh.mh_data = (char *)args->eh;
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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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mh.mh_data = "DDDDDDSSSSSS\x08\x00";
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if (args->f_id.addr_type == 4) {
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/* restore wire format */
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SET_NET_IPLEN(ip);
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}
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}
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BPF_MTAP(log_if, (struct mbuf *)&mh);
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if (args->eh == NULL && args->f_id.addr_type == 4) {
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/* restore host format */
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SET_HOST_IPLEN(ip);
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}
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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)
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cmd += F_LEN(cmd);
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if (cmd->opcode == O_TAG)
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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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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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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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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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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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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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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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#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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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_ntoa_r(ip->ip_src, src);
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inet_ntoa_r(ip->ip_dst, 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),
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"ICMP:%u.%u ",
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icmp->icmp_type, icmp->icmp_code);
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else
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len = snprintf(SNPARGS(proto, 0), "ICMP ");
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len += snprintf(SNPARGS(proto, len), "%s", src);
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snprintf(SNPARGS(proto, len), " %s", dst);
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break;
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#ifdef INET6
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case IPPROTO_ICMPV6:
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icmp6 = (struct icmp6_hdr *)(((char *)ip) + hlen);
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if (offset == 0)
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len = snprintf(SNPARGS(proto, 0),
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"ICMPv6:%u.%u ",
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icmp6->icmp6_type, icmp6->icmp6_code);
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else
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len = snprintf(SNPARGS(proto, 0), "ICMPv6 ");
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len += snprintf(SNPARGS(proto, len), "%s", src);
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snprintf(SNPARGS(proto, len), " %s", dst);
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break;
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#endif
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default:
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len = snprintf(SNPARGS(proto, 0), "P:%d %s",
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args->f_id.proto, src);
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snprintf(SNPARGS(proto, len), " %s", dst);
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break;
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}
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#ifdef INET6
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if (IS_IP6_FLOW_ID(&(args->f_id))) {
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if (offset & (IP6F_OFF_MASK | IP6F_MORE_FRAG))
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snprintf(SNPARGS(fragment, 0),
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" (frag %08x:%d@%d%s)",
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args->f_id.frag_id6,
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ntohs(ip6->ip6_plen) - hlen,
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ntohs(offset & IP6F_OFF_MASK) << 3,
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(offset & IP6F_MORE_FRAG) ? "+" : "");
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} else
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#endif
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{
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int ip_off, ip_len;
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#ifndef HAVE_NET_IPLEN
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if (args->eh == NULL) {
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ip_off = ip->ip_off;
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ip_len = ip->ip_len;
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} else
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#endif /* !HAVE_NET_IPLEN */
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{
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ip_off = ntohs(ip->ip_off);
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ip_len = ntohs(ip->ip_len);
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}
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if (ip_off & (IP_MF | IP_OFFMASK))
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snprintf(SNPARGS(fragment, 0),
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" (frag %d:%d@%d%s)",
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ntohs(ip->ip_id), ip_len - (ip->ip_hl << 2),
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offset << 3,
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(ip_off & IP_MF) ? "+" : "");
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}
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}
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if (oif || m->m_pkthdr.rcvif)
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log(LOG_SECURITY | LOG_INFO,
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"ipfw: %d %s %s %s via %s%s\n",
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f ? f->rulenum : -1,
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action, proto, oif ? "out" : "in",
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oif ? oif->if_xname : m->m_pkthdr.rcvif->if_xname,
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fragment);
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else
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log(LOG_SECURITY | LOG_INFO,
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"ipfw: %d %s %s [no if info]%s\n",
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f ? f->rulenum : -1,
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action, proto, fragment);
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if (limit_reached)
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log(LOG_SECURITY | LOG_NOTICE,
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"ipfw: limit %d reached on entry %d\n",
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limit_reached, f ? f->rulenum : -1);
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}
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/* end of file */
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