--- /dev/null
+/*-
+ * Copyright (c) 2002-2009 Luigi Rizzo, Universita` di Pisa
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: head/sys/netinet/ipfw/ip_fw_log.c 200601 2009-12-16 10:48:40Z luigi $");
+
+/*
+ * Logging support for ipfw
+ */
+
+#if !defined(KLD_MODULE)
+#include "opt_ipfw.h"
+#include "opt_ipdivert.h"
+#include "opt_ipdn.h"
+#include "opt_inet.h"
+#ifndef INET
+#error IPFIREWALL requires INET.
+#endif /* INET */
+#endif
+#include "opt_inet6.h"
+#include "opt_ipsec.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/mbuf.h>
+#include <sys/kernel.h>
+#include <sys/socket.h>
+#include <sys/sysctl.h>
+#include <sys/syslog.h>
+#include <net/ethernet.h> /* for ETHERTYPE_IP */
+#include <net/if.h>
+#include <net/vnet.h>
+#include <net/if_types.h> /* for IFT_ETHER */
+#include <net/bpf.h> /* for BPF */
+
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#include <netinet/ip_icmp.h>
+#include <netinet/ip_fw.h>
+#include <netinet/ipfw/ip_fw_private.h>
+#include <netinet/tcp_var.h>
+#include <netinet/udp.h>
+
+#include <netinet/ip6.h>
+#include <netinet/icmp6.h>
+#ifdef INET6
+#include <netinet6/in6_var.h> /* ip6_sprintf() */
+#endif
+
+#ifdef MAC
+#include <security/mac/mac_framework.h>
+#endif
+
+/*
+ * L3HDR maps an ipv4 pointer into a layer3 header pointer of type T
+ * Other macros just cast void * into the appropriate type
+ */
+#define L3HDR(T, ip) ((T *)((u_int32_t *)(ip) + (ip)->ip_hl))
+#define TCP(p) ((struct tcphdr *)(p))
+#define SCTP(p) ((struct sctphdr *)(p))
+#define UDP(p) ((struct udphdr *)(p))
+#define ICMP(p) ((struct icmphdr *)(p))
+#define ICMP6(p) ((struct icmp6_hdr *)(p))
+
+#define SNPARGS(buf, len) buf + len, sizeof(buf) > len ? sizeof(buf) - len : 0
+#define SNP(buf) buf, sizeof(buf)
+
+#ifdef WITHOUT_BPF
+void
+ipfw_log_bpf(int onoff)
+{
+}
+#else /* !WITHOUT_BPF */
+static struct ifnet *log_if; /* hook to attach to bpf */
+
+/* we use this dummy function for all ifnet callbacks */
+static int
+log_dummy(struct ifnet *ifp, u_long cmd, caddr_t addr)
+{
+ return EINVAL;
+}
+
+void
+ipfw_log_bpf(int onoff)
+{
+ struct ifnet *ifp;
+
+ if (onoff) {
+ if (log_if)
+ return;
+ ifp = if_alloc(IFT_ETHER);
+ if (ifp == NULL)
+ return;
+ if_initname(ifp, "ipfw", 0);
+ ifp->if_mtu = 65536;
+ ifp->if_flags = IFF_UP | IFF_SIMPLEX | IFF_MULTICAST;
+ ifp->if_init = (void *)log_dummy;
+ ifp->if_ioctl = log_dummy;
+ ifp->if_start = (void *)log_dummy;
+ ifp->if_output = (void *)log_dummy;
+ ifp->if_addrlen = 6;
+ ifp->if_hdrlen = 14;
+ if_attach(ifp);
+ ifp->if_baudrate = IF_Mbps(10);
+ bpfattach(ifp, DLT_EN10MB, 14);
+ log_if = ifp;
+ } else {
+ if (log_if) {
+ ether_ifdetach(log_if);
+ if_free(log_if);
+ }
+ log_if = NULL;
+ }
+}
+#endif /* !WITHOUT_BPF */
+
+/*
+ * We enter here when we have a rule with O_LOG.
+ * XXX this function alone takes about 2Kbytes of code!
+ */
+void
+ipfw_log(struct ip_fw *f, u_int hlen, struct ip_fw_args *args,
+ struct mbuf *m, struct ifnet *oif, u_short offset, uint32_t tablearg,
+ struct ip *ip)
+{
+ char *action;
+ int limit_reached = 0;
+ char action2[40], proto[128], fragment[32];
+
+ if (V_fw_verbose == 0) {
+#ifndef WITHOUT_BPF
+ struct m_hdr mh;
+
+ if (log_if == NULL || log_if->if_bpf == NULL)
+ return;
+ /* BPF treats the "mbuf" as read-only */
+ mh.mh_next = m;
+ mh.mh_len = ETHER_HDR_LEN;
+ if (args->eh) { /* layer2, use orig hdr */
+ mh.mh_data = (char *)args->eh;
+ } else {
+ /* add fake header. Later we will store
+ * more info in the header
+ */
+ mh.mh_data = "DDDDDDSSSSSS\x08\x00";
+ }
+ BPF_MTAP(log_if, (struct mbuf *)&mh);
+#endif /* !WITHOUT_BPF */
+ return;
+ }
+ /* the old 'log' function */
+ fragment[0] = '\0';
+ proto[0] = '\0';
+
+ if (f == NULL) { /* bogus pkt */
+ if (V_verbose_limit != 0 && V_norule_counter >= V_verbose_limit)
+ return;
+ V_norule_counter++;
+ if (V_norule_counter == V_verbose_limit)
+ limit_reached = V_verbose_limit;
+ action = "Refuse";
+ } else { /* O_LOG is the first action, find the real one */
+ ipfw_insn *cmd = ACTION_PTR(f);
+ ipfw_insn_log *l = (ipfw_insn_log *)cmd;
+
+ if (l->max_log != 0 && l->log_left == 0)
+ return;
+ l->log_left--;
+ if (l->log_left == 0)
+ limit_reached = l->max_log;
+ cmd += F_LEN(cmd); /* point to first action */
+ if (cmd->opcode == O_ALTQ) {
+ ipfw_insn_altq *altq = (ipfw_insn_altq *)cmd;
+
+ snprintf(SNPARGS(action2, 0), "Altq %d",
+ altq->qid);
+ cmd += F_LEN(cmd);
+ }
+ if (cmd->opcode == O_PROB)
+ cmd += F_LEN(cmd);
+
+ if (cmd->opcode == O_TAG)
+ cmd += F_LEN(cmd);
+
+ action = action2;
+ switch (cmd->opcode) {
+ case O_DENY:
+ action = "Deny";
+ break;
+
+ case O_REJECT:
+ if (cmd->arg1==ICMP_REJECT_RST)
+ action = "Reset";
+ else if (cmd->arg1==ICMP_UNREACH_HOST)
+ action = "Reject";
+ else
+ snprintf(SNPARGS(action2, 0), "Unreach %d",
+ cmd->arg1);
+ break;
+
+ case O_UNREACH6:
+ if (cmd->arg1==ICMP6_UNREACH_RST)
+ action = "Reset";
+ else
+ snprintf(SNPARGS(action2, 0), "Unreach %d",
+ cmd->arg1);
+ break;
+
+ case O_ACCEPT:
+ action = "Accept";
+ break;
+ case O_COUNT:
+ action = "Count";
+ break;
+ case O_DIVERT:
+ snprintf(SNPARGS(action2, 0), "Divert %d",
+ cmd->arg1);
+ break;
+ case O_TEE:
+ snprintf(SNPARGS(action2, 0), "Tee %d",
+ cmd->arg1);
+ break;
+ case O_SETFIB:
+ snprintf(SNPARGS(action2, 0), "SetFib %d",
+ cmd->arg1);
+ break;
+ case O_SKIPTO:
+ snprintf(SNPARGS(action2, 0), "SkipTo %d",
+ cmd->arg1);
+ break;
+ case O_PIPE:
+ snprintf(SNPARGS(action2, 0), "Pipe %d",
+ cmd->arg1);
+ break;
+ case O_QUEUE:
+ snprintf(SNPARGS(action2, 0), "Queue %d",
+ cmd->arg1);
+ break;
+ case O_FORWARD_IP: {
+ ipfw_insn_sa *sa = (ipfw_insn_sa *)cmd;
+ int len;
+ struct in_addr dummyaddr;
+ if (sa->sa.sin_addr.s_addr == INADDR_ANY)
+ dummyaddr.s_addr = htonl(tablearg);
+ else
+ dummyaddr.s_addr = sa->sa.sin_addr.s_addr;
+
+ len = snprintf(SNPARGS(action2, 0), "Forward to %s",
+ inet_ntoa(dummyaddr));
+
+ if (sa->sa.sin_port)
+ snprintf(SNPARGS(action2, len), ":%d",
+ sa->sa.sin_port);
+ }
+ break;
+ case O_NETGRAPH:
+ snprintf(SNPARGS(action2, 0), "Netgraph %d",
+ cmd->arg1);
+ break;
+ case O_NGTEE:
+ snprintf(SNPARGS(action2, 0), "Ngtee %d",
+ cmd->arg1);
+ break;
+ case O_NAT:
+ action = "Nat";
+ break;
+ case O_REASS:
+ action = "Reass";
+ break;
+ default:
+ action = "UNKNOWN";
+ break;
+ }
+ }
+
+ if (hlen == 0) { /* non-ip */
+ snprintf(SNPARGS(proto, 0), "MAC");
+
+ } else {
+ int len;
+#ifdef INET6
+ char src[INET6_ADDRSTRLEN + 2], dst[INET6_ADDRSTRLEN + 2];
+#else
+ char src[INET_ADDRSTRLEN], dst[INET_ADDRSTRLEN];
+#endif
+ struct icmphdr *icmp;
+ struct tcphdr *tcp;
+ struct udphdr *udp;
+#ifdef INET6
+ struct ip6_hdr *ip6 = NULL;
+ struct icmp6_hdr *icmp6;
+#endif
+ src[0] = '\0';
+ dst[0] = '\0';
+#ifdef INET6
+ if (IS_IP6_FLOW_ID(&(args->f_id))) {
+ char ip6buf[INET6_ADDRSTRLEN];
+ snprintf(src, sizeof(src), "[%s]",
+ ip6_sprintf(ip6buf, &args->f_id.src_ip6));
+ snprintf(dst, sizeof(dst), "[%s]",
+ ip6_sprintf(ip6buf, &args->f_id.dst_ip6));
+
+ ip6 = (struct ip6_hdr *)ip;
+ tcp = (struct tcphdr *)(((char *)ip) + hlen);
+ udp = (struct udphdr *)(((char *)ip) + hlen);
+ } else
+#endif
+ {
+ tcp = L3HDR(struct tcphdr, ip);
+ udp = L3HDR(struct udphdr, ip);
+
+ inet_ntoa_r(ip->ip_src, src);
+ inet_ntoa_r(ip->ip_dst, dst);
+ }
+
+ switch (args->f_id.proto) {
+ case IPPROTO_TCP:
+ len = snprintf(SNPARGS(proto, 0), "TCP %s", src);
+ if (offset == 0)
+ snprintf(SNPARGS(proto, len), ":%d %s:%d",
+ ntohs(tcp->th_sport),
+ dst,
+ ntohs(tcp->th_dport));
+ else
+ snprintf(SNPARGS(proto, len), " %s", dst);
+ break;
+
+ case IPPROTO_UDP:
+ len = snprintf(SNPARGS(proto, 0), "UDP %s", src);
+ if (offset == 0)
+ snprintf(SNPARGS(proto, len), ":%d %s:%d",
+ ntohs(udp->uh_sport),
+ dst,
+ ntohs(udp->uh_dport));
+ else
+ snprintf(SNPARGS(proto, len), " %s", dst);
+ break;
+
+ case IPPROTO_ICMP:
+ icmp = L3HDR(struct icmphdr, ip);
+ if (offset == 0)
+ 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.frag_id6,
+ ntohs(ip6->ip6_plen) - hlen,
+ ntohs(offset & IP6F_OFF_MASK) << 3,
+ (offset & IP6F_MORE_FRAG) ? "+" : "");
+ } 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) ? "+" : "");
+ }
+ }
+#ifndef __linux__
+ 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 */
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