70228fb346
At this time we pull out from ip_fw2.c the logging functions, and support for dynamic rules, and move kernel-only stuff into netinet/ipfw/ip_fw_private.h No ABI change involved in this commit, unless I made some mistake. ip_fw.h has changed, though not in the userland-visible part. Files touched by this commit: conf/files now references the two new source files netinet/ip_fw.h remove kernel-only definitions gone into netinet/ipfw/ip_fw_private.h. netinet/ipfw/ip_fw_private.h new file with kernel-specific ipfw definitions netinet/ipfw/ip_fw_log.c ipfw_log and related functions netinet/ipfw/ip_fw_dynamic.c code related to dynamic rules netinet/ipfw/ip_fw2.c removed the pieces that goes in the new files netinet/ipfw/ip_fw_nat.c minor rearrangement to remove LOOKUP_NAT from the main headers. This require a new function pointer. A bunch of other kernel files that included netinet/ip_fw.h now require netinet/ipfw/ip_fw_private.h as well. Not 100% sure i caught all of them. MFC after: 1 month
372 lines
9.6 KiB
C
372 lines
9.6 KiB
C
/*-
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* Copyright (c) 2002 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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#define DEB(x)
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#define DDB(x) x
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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 <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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/* counter for ipfw_log(NULL...) */
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VNET_DEFINE(u_int64_t, norule_counter);
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VNET_DEFINE(int, verbose_limit);
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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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/*
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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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struct ether_header *eh = args->eh;
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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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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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if (eh != NULL) { /* layer 2 packets are as on the wire */
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ip_off = ntohs(ip->ip_off);
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ip_len = ntohs(ip->ip_len);
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} else {
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ip_off = ip->ip_off;
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ip_len = 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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