--- /dev/null
+.TH XTABLES\-MONITOR 8 "" "@PACKAGE_STRING@" "@PACKAGE_STRING@"
+.SH NAME
+xtables-monitor \(em show changes to rule set and trace-events
+.SH SYNOPSIS
+\fBxtables\-monitor\fP [\fB\-t\fP] [\fB\-e\fP] [\fB\-4\fP|\fB|\-6\fB]
+.PP
+\
+.SH DESCRIPTION
+.PP
+.B xtables-monitor
+is used to monitor changes to the ruleset or to show rule evaluation events
+for packets tagged using the TRACE target.
+.B xtables-monitor
+will run until the user aborts execution, typically by using CTRL-C.
+.RE
+.SH OPTIONS
+\fB\-e\fP, \fB\-\-event\fP
+.TP
+Watch for updates to the rule set.
+Updates include creation of new tables, chains and rules and
+the name of the program that caused the rule update.
+.TP
+\fB\-t\fP, \fB\-\-trace\fP
+Watch for trace events generated by packets that have been tagged
+using the TRACE target.
+.TP
+\fB\-4\fP
+Restrict output to ipv4.
+.TP
+\fB\-6\fP
+Restrict output to ipv6.
+.SH EXAMPLE OUTPUT
+.TP
+.B xtables-monitor \-\-trace
+
+ 1 TRACE: 2 fc475095 raw:PREROUTING:rule:0x3:CONTINUE \-4 \-t raw \-A PREROUTING \-p icmp \-j TRACE
+ 2 PACKET: 0 fc475095 IN=lo LL=0x304 0000000000000000000000000800 SRC=127.0.0.1 DST=127.0.0.1 LEN=84 TOS=0x0 TTL=64 ID=38349DF
+ 3 TRACE: 2 fc475095 raw:PREROUTING:return:
+ 4 TRACE: 2 fc475095 raw:PREROUTING:policy:ACCEPT
+ 5 TRACE: 2 fc475095 filter:INPUT:return:
+ 6 TRACE: 2 fc475095 filter:INPUT:policy:DROP
+ 7 TRACE: 2 0df9d3d8 raw:PREROUTING:rule:0x3:CONTINUE \-4 \-t raw \-A PREROUTING \-p icmp \-j TRACE
+.PP
+The first line shows a packet entering rule set evaluation.
+The protocol number is shown (AF_INET in this case), then a packet
+identifier number that allows to correlate messages coming from rule set evaluation of
+this packet. After this, the rule that was matched by the packet is shown.
+This is the TRACE rule that turns on tracing events for this packet.
+
+The second line dumps information about the packet. Incoming interface
+and packet headers such as source and destination addresses are shown.
+
+The third line shows that the packet completed traversal of the raw table
+PREROUTING chain, and is returning, followed by use the chain policy to make accept/drop
+decision (the example shows accept being applied).
+The fifth line shows that the packet leaves the filter INPUT chain, i.e., no rules in the filter tables
+INPUT chain matched the packet.
+It then got DROPPED by the policy of the INPUT table, as hown by line six.
+The last line shows another packet arriving \-\- the packet id is different.
+
+When using the TRACE target, it is usally a good idea to only select packets
+that are relevant, for example via
+.nf
+iptables \-t raw \-A PREROUTING \-p tcp \-\-dport 80 \-\-syn \-m limit \-\-limit 1/s \-j TRACE
+.fi
+.TP
+.B xtables-monitor \-\-event
+ 1 EVENT: nft: NEW table: table filter ip flags 0 use 4 handle 444
+ 2 EVENT: # nft: ip filter INPUT use 2 type filter hook input prio 0 policy drop packets 0 bytes 0
+ 3 EVENT: # nft: ip filter FORWARD use 0 type filter hook forward prio 0 policy accept packets 0 bytes 0
+ 4 EVENT: # nft: ip filter OUTPUT use 0 type filter hook output prio 0 policy accept packets 0 bytes 0
+ 5 EVENT: \-4 \-t filter \-N TCP
+ 6 EVENT: \-4 \-t filter \-A TCP \-s 192.168.0.0/16 \-p tcp \-m tcp \-\-dport 22 \-j ACCEPT
+ 7 EVENT: \-4 \-t filter \-A TCP \-p tcp \-m multiport \-\-dports 80,443 \-j ACCEPT
+ 8 EVENT: \-4 \-t filter \-A INPUT \-p tcp \-j TCP
+ 9 EVENT: \-4 \-t filter \-A INPUT \-m conntrack \-\-ctstate RELATED,ESTABLISHED \-j ACCEPT
+ 10 NEWGEN: GENID=13904 PID=25167 NAME=iptables-nftables-restore
+.PP
+This example shows event monitoring. Line one shows creation of a table (filter in this case), followed
+by three base hooks INPUT, FORWARD and OUTPUT. The iptables-nftables tools all create tables and base
+chains automatically when needed, so this is expected when a table was not yet initialized or when it is
+re-created from scratch by iptables-nftables-restore. Line five shows a new user-defined chain (TCP)
+being added, followed by addition a few rules. the last line shows that a new ruleset generation has
+become active, i.e., the rule set changes are now active. This also lists the process id and the programs name.
+.SH LIMITATIONS
+.B xtables-monitor
+only works with rules added using iptables-nftables, rules added using
+iptables-legacy cannot be monitored.
+.SH BUGS
+Should be reported or by sending email to netfilter-devel@vger.kernel.org or
+by filing a report on https://bugzilla.netfilter.org/.
+.SH SEE ALSO
+\fBiptables\fP(8), \fBxtables\fP(8), \fBnft\fP(8)
--- /dev/null
+/*
+ * (C) 2012-2013 by Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This software has been sponsored by Sophos Astaro <http://www.sophos.com>
+ */
+
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include <netinet/ether.h>
+#include <netinet/in.h>
+#include <netinet/ip6.h>
+#include <net/if_arp.h>
+#include <getopt.h>
+
+#include <sys/socket.h>
+#include <arpa/inet.h>
+
+#include <linux/netfilter/nfnetlink.h>
+#include <linux/netfilter/nf_tables.h>
+
+#include <libmnl/libmnl.h>
+#include <libnftnl/table.h>
+#include <libnftnl/trace.h>
+#include <libnftnl/chain.h>
+#include <libnftnl/rule.h>
+
+#include <include/xtables.h>
+#include "iptables.h" /* for xtables_globals */
+#include "xtables-multi.h"
+#include "nft.h"
+#include "nft-arp.h"
+
+struct cb_arg {
+ uint32_t nfproto;
+ bool is_event;
+};
+
+static int table_cb(const struct nlmsghdr *nlh, void *data)
+{
+ uint32_t type = nlh->nlmsg_type & 0xFF;
+ const struct cb_arg *arg = data;
+ struct nftnl_table *t;
+ char buf[4096];
+
+ t = nftnl_table_alloc();
+ if (t == NULL)
+ goto err;
+
+ if (nftnl_table_nlmsg_parse(nlh, t) < 0)
+ goto err_free;
+
+ if (arg->nfproto && arg->nfproto != nftnl_table_get_u32(t, NFTNL_TABLE_FAMILY))
+ goto err_free;
+ nftnl_table_snprintf(buf, sizeof(buf), t, NFTNL_OUTPUT_DEFAULT, 0);
+ printf(" EVENT: ");
+ printf("nft: %s table: %s\n", type == NFT_MSG_NEWTABLE ? "NEW" : "DEL", buf);
+
+err_free:
+ nftnl_table_free(t);
+err:
+ return MNL_CB_OK;
+}
+
+static bool counters;
+static bool trace;
+static bool events;
+
+static int rule_cb(const struct nlmsghdr *nlh, void *data)
+{
+ struct arptables_command_state cs_arp = {};
+ struct iptables_command_state cs = {};
+ uint32_t type = nlh->nlmsg_type & 0xFF;
+ const struct cb_arg *arg = data;
+ struct nftnl_rule *r;
+ void *fw = NULL;
+ uint8_t family;
+
+ r = nftnl_rule_alloc();
+ if (r == NULL)
+ goto err;
+
+ if (nftnl_rule_nlmsg_parse(nlh, r) < 0)
+ goto err_free;
+
+ family = nftnl_rule_get_u32(r, NFTNL_RULE_FAMILY);
+ if (arg->nfproto && arg->nfproto != family)
+ goto err_free;
+
+ if (arg->is_event)
+ printf(" EVENT: ");
+ switch (family) {
+ case AF_INET:
+ case AF_INET6:
+ printf("-%c ", family == AF_INET ? '4' : '6');
+ nft_rule_to_iptables_command_state(r, &cs);
+ fw = &cs;
+ break;
+ case NFPROTO_ARP:
+ printf("-0 ");
+ nft_rule_to_arptables_command_state(r, &cs_arp);
+ fw = &cs_arp;
+ break;
+ default:
+ goto err_free;
+ }
+
+ printf("-t %s ", nftnl_rule_get_str(r, NFTNL_RULE_TABLE));
+ nft_rule_print_save(fw, r,
+ type == NFT_MSG_NEWRULE ? NFT_RULE_APPEND :
+ NFT_RULE_DEL,
+ counters ? 0 : FMT_NOCOUNTS);
+err_free:
+ nftnl_rule_free(r);
+err:
+ return MNL_CB_OK;
+}
+
+static int chain_cb(const struct nlmsghdr *nlh, void *data)
+{
+ uint32_t type = nlh->nlmsg_type & 0xFF;
+ const struct cb_arg *arg = data;
+ struct nftnl_chain *c;
+ char buf[4096];
+ int family;
+
+ c = nftnl_chain_alloc();
+ if (c == NULL)
+ goto err;
+
+ if (nftnl_chain_nlmsg_parse(nlh, c) < 0)
+ goto err_free;
+
+ family = nftnl_chain_get_u32(c, NFTNL_CHAIN_FAMILY);
+ if (arg->nfproto && arg->nfproto != family)
+ goto err_free;
+
+ if (nftnl_chain_is_set(c, NFTNL_CHAIN_PRIO))
+ family = -1;
+
+ printf(" EVENT: ");
+ switch (family) {
+ case NFPROTO_IPV4:
+ family = 4;
+ break;
+ case NFPROTO_IPV6:
+ family = 6;
+ break;
+ default:
+ nftnl_chain_snprintf(buf, sizeof(buf), c, NFTNL_OUTPUT_DEFAULT, 0);
+ printf("# nft: %s\n", buf);
+ goto err_free;
+ }
+
+ printf("-%d -t %s -%c %s\n",
+ family,
+ nftnl_chain_get_str(c, NFTNL_CHAIN_TABLE),
+ type == NFT_MSG_NEWCHAIN ? 'N' : 'X',
+ nftnl_chain_get_str(c, NFTNL_CHAIN_NAME));
+err_free:
+ nftnl_chain_free(c);
+err:
+ return MNL_CB_OK;
+}
+
+static int newgen_cb(const struct nlmsghdr *nlh, void *data)
+{
+ uint32_t genid = 0, pid = 0;
+ const struct nlattr *attr;
+ const char *name = NULL;
+
+ mnl_attr_for_each(attr, nlh, sizeof(struct nfgenmsg)) {
+ switch (mnl_attr_get_type(attr)) {
+ case NFTA_GEN_ID:
+ if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+ break;
+ genid = ntohl(mnl_attr_get_u32(attr));
+ break;
+ case NFTA_GEN_PROC_NAME:
+ if (mnl_attr_validate(attr, MNL_TYPE_NUL_STRING) < 0)
+ break;
+ name = mnl_attr_get_str(attr);
+ break;
+ case NFTA_GEN_PROC_PID:
+ if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+ break;
+ pid = ntohl(mnl_attr_get_u32(attr));
+ break;
+ }
+ }
+
+ if (name)
+ printf("NEWGEN: GENID=%u PID=%u NAME=%s\n", genid, pid, name);
+
+ return MNL_CB_OK;
+}
+
+static void trace_print_return(const struct nftnl_trace *nlt)
+{
+ const char *chain = NULL;
+
+ if (nftnl_trace_is_set(nlt, NFTNL_TRACE_JUMP_TARGET)) {
+ chain = nftnl_trace_get_str(nlt, NFTNL_TRACE_JUMP_TARGET);
+ printf("%s", chain);
+ }
+}
+
+static void trace_print_rule(const struct nftnl_trace *nlt, struct cb_arg *args)
+{
+ uint64_t handle = nftnl_trace_get_u64(nlt, NFTNL_TRACE_RULE_HANDLE);
+ uint32_t family = nftnl_trace_get_u32(nlt, NFTNL_TRACE_FAMILY);
+ const char *table = nftnl_trace_get_str(nlt, NFTNL_TRACE_TABLE);
+ const char *chain = nftnl_trace_get_str(nlt, NFTNL_TRACE_CHAIN);
+ struct nftnl_rule *r;
+ struct mnl_socket *nl;
+ struct nlmsghdr *nlh;
+ uint32_t portid;
+ char buf[16536];
+ int ret;
+
+ r = nftnl_rule_alloc();
+ if (r == NULL) {
+ perror("OOM");
+ exit(EXIT_FAILURE);
+ }
+
+ nlh = nftnl_chain_nlmsg_build_hdr(buf, NFT_MSG_GETRULE, family, NLM_F_DUMP, 0);
+
+ nftnl_rule_set_u32(r, NFTNL_RULE_FAMILY, family);
+ nftnl_rule_set_str(r, NFTNL_RULE_CHAIN, chain);
+ nftnl_rule_set_str(r, NFTNL_RULE_TABLE, table);
+ nftnl_rule_set_u64(r, NFTNL_RULE_POSITION, handle);
+ nftnl_rule_nlmsg_build_payload(nlh, r);
+ nftnl_rule_free(r);
+
+ nl = mnl_socket_open(NETLINK_NETFILTER);
+ if (nl == NULL) {
+ perror("mnl_socket_open");
+ exit(EXIT_FAILURE);
+ }
+
+ if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
+ perror("mnl_socket_bind");
+ exit(EXIT_FAILURE);
+ }
+
+ portid = mnl_socket_get_portid(nl);
+ if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
+ perror("mnl_socket_send");
+ exit(EXIT_FAILURE);
+ }
+
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ while (ret > 0) {
+ args->is_event = false;
+ ret = mnl_cb_run(buf, ret, 0, portid, rule_cb, args);
+ if (ret <= 0)
+ break;
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ }
+ if (ret == -1) {
+ perror("error");
+ exit(EXIT_FAILURE);
+ }
+ mnl_socket_close(nl);
+}
+
+static void trace_print_packet(const struct nftnl_trace *nlt, struct cb_arg *args)
+{
+ struct list_head stmts = LIST_HEAD_INIT(stmts);
+ uint32_t nfproto, family;
+ uint16_t l4proto = 0;
+ uint32_t mark;
+ char name[IFNAMSIZ];
+
+ printf("PACKET: %d %08x ", args->nfproto, nftnl_trace_get_u32(nlt, NFTNL_TRACE_ID));
+
+ if (nftnl_trace_is_set(nlt, NFTNL_TRACE_IIF))
+ printf("IN=%s ", if_indextoname(nftnl_trace_get_u32(nlt, NFTNL_TRACE_IIF), name));
+ if (nftnl_trace_is_set(nlt, NFTNL_TRACE_OIF))
+ printf("OUT=%s ", if_indextoname(nftnl_trace_get_u32(nlt, NFTNL_TRACE_OIF), name));
+
+ family = nftnl_trace_get_u32(nlt, NFTNL_TRACE_FAMILY);
+ nfproto = family;
+ if (nftnl_trace_is_set(nlt, NFTNL_TRACE_NFPROTO)) {
+ nfproto = nftnl_trace_get_u32(nlt, NFTNL_TRACE_NFPROTO);
+
+ if (family != nfproto)
+ printf("NFPROTO=%d ", nfproto);
+ }
+
+ if (nftnl_trace_is_set(nlt, NFTNL_TRACE_LL_HEADER)) {
+ const struct ethhdr *eh;
+ const char *linklayer;
+ uint32_t i, len;
+ uint16_t type = nftnl_trace_get_u16(nlt, NFTNL_TRACE_IIFTYPE);
+
+ linklayer = nftnl_trace_get_data(nlt, NFTNL_TRACE_LL_HEADER, &len);
+ switch (type) {
+ case ARPHRD_ETHER:
+ if (len < sizeof(*eh))
+ break;
+ eh = (const void *)linklayer;
+ printf("MACSRC=%s ", ether_ntoa((const void *)eh->h_source));
+ printf("MACDST=%s ", ether_ntoa((const void *)eh->h_dest));
+ printf("MACPROTO=%04x ", ntohs(eh->h_proto));
+ break;
+ default:
+ printf("LL=0x%x ", type);
+ for (i = 0 ; i < len; i++)
+ printf("%02x", linklayer[i]);
+ printf(" ");
+ break;
+ }
+ }
+
+ if (nftnl_trace_is_set(nlt, NFTNL_TRACE_NETWORK_HEADER)) {
+ const struct ip6_hdr *ip6h;
+ const struct iphdr *iph;
+ uint32_t i, len;
+ const char *nh;
+
+ ip6h = nftnl_trace_get_data(nlt, NFTNL_TRACE_NETWORK_HEADER, &len);
+
+ switch (nfproto) {
+ case NFPROTO_IPV4: {
+ char addrbuf[INET_ADDRSTRLEN];
+
+ if (len < sizeof(*iph))
+ break;
+ iph = (const void *)ip6h;
+
+
+ inet_ntop(AF_INET, &iph->saddr, addrbuf, sizeof(addrbuf));
+ printf("SRC=%s ", addrbuf);
+ inet_ntop(AF_INET, &iph->daddr, addrbuf, sizeof(addrbuf));
+ printf("DST=%s ", addrbuf);
+
+ printf("LEN=%d TOS=0x%x TTL=%d ID=%d", ntohs(iph->tot_len), iph->tos, iph->ttl, ntohs(iph->id));
+ if (iph->frag_off & htons(0x8000))
+ printf("CE ");
+ if (iph->frag_off & htons(IP_DF))
+ printf("DF ");
+ if (iph->frag_off & htons(IP_MF))
+ printf("MF ");
+
+ if (ntohs(iph->frag_off) & 0x1fff)
+ printf("FRAG:%u ", ntohs(iph->frag_off) & 0x1fff);
+
+ l4proto = iph->protocol;
+ if (iph->ihl * 4 > sizeof(*iph)) {
+ unsigned int optsize;
+ const char *op;
+
+ optsize = iph->ihl * 4 - sizeof(*iph);
+ op = (const char *)iph;
+ op += sizeof(*iph);
+
+ printf("OPT (");
+ for (i = 0; i < optsize; i++)
+ printf("%02X", op[i]);
+ printf(")");
+ }
+ break;
+ }
+ case NFPROTO_IPV6: {
+ uint32_t flowlabel = ntohl(*(uint32_t *)ip6h);
+ char addrbuf[INET6_ADDRSTRLEN];
+
+ if (len < sizeof(*ip6h))
+ break;
+
+ inet_ntop(AF_INET6, &ip6h->ip6_src, addrbuf, sizeof(addrbuf));
+ printf("SRC=%s ", addrbuf);
+ inet_ntop(AF_INET6, &ip6h->ip6_dst, addrbuf, sizeof(addrbuf));
+ printf("DST=%s ", addrbuf);
+
+ printf("LEN=%zu TC=%u HOPLIMIT=%u FLOWLBL=%u ",
+ ntohs(ip6h->ip6_plen) + sizeof(*iph),
+ (flowlabel & 0x0ff00000) >> 20,
+ ip6h->ip6_hops,
+ flowlabel & 0x000fffff);
+
+ l4proto = ip6h->ip6_nxt;
+ break;
+ }
+ default:
+ nh = (const char *)ip6h;
+ printf("NH=");
+ for (i = 0 ; i < len; i++)
+ printf("%02x", nh[i]);
+ printf(" ");
+ }
+ }
+
+ if (nftnl_trace_is_set(nlt, NFTNL_TRACE_TRANSPORT_HEADER)) {
+ const struct tcphdr *tcph;
+ uint32_t len;
+
+ tcph = nftnl_trace_get_data(nlt, NFTNL_TRACE_TRANSPORT_HEADER, &len);
+
+ switch (l4proto) {
+ case IPPROTO_DCCP:
+ case IPPROTO_SCTP:
+ case IPPROTO_UDPLITE:
+ case IPPROTO_UDP:
+ if (len < 4)
+ break;
+ printf("SPORT=%d DPORT=%d ", ntohs(tcph->th_sport), ntohs(tcph->th_dport));
+ break;
+ case IPPROTO_TCP:
+ if (len < sizeof(*tcph))
+ break;
+ printf("SPORT=%d DPORT=%d ", ntohs(tcph->th_sport), ntohs(tcph->th_dport));
+ if (tcph->th_flags & (TH_FIN|TH_SYN|TH_RST|TH_PUSH|TH_ACK|TH_URG)) {
+ if (tcph->th_flags & TH_SYN)
+ printf("SYN ");
+ if (tcph->th_flags & TH_ACK)
+ printf("ACK ");
+ if (tcph->th_flags & TH_FIN)
+ printf("FIN ");
+ if (tcph->th_flags & TH_RST)
+ printf("RST ");
+ if (tcph->th_flags & TH_PUSH)
+ printf("PSH ");
+ if (tcph->th_flags & TH_URG)
+ printf("URG ");
+ }
+ break;
+ default:
+ break;
+ }
+ }
+
+ mark = nftnl_trace_get_u32(nlt, NFTNL_TRACE_MARK);
+ if (mark)
+ printf("MARK=0x%x ", mark);
+}
+
+static void print_verdict(struct nftnl_trace *nlt, uint32_t verdict)
+{
+ const char *chain;
+
+ switch (verdict) {
+ case NF_ACCEPT:
+ printf("ACCEPT");
+ break;
+ case NF_DROP:
+ printf("DROP");
+ break;
+ case NF_QUEUE:
+ printf("QUEUE");
+ break;
+ case NF_STOLEN:
+ printf("STOLEN");
+ break;
+ case NFT_BREAK:
+ printf("BREAK");
+ break;
+ case NFT_CONTINUE:
+ printf("CONTINUE");
+ break;
+ case NFT_GOTO:
+ printf("GOTO");
+ if (nftnl_trace_is_set(nlt, NFTNL_TRACE_JUMP_TARGET)) {
+ chain = nftnl_trace_get_str(nlt, NFTNL_TRACE_JUMP_TARGET);
+ printf(":%s", chain);
+ }
+ break;
+ case NFT_JUMP:
+ printf("JUMP");
+ if (nftnl_trace_is_set(nlt, NFTNL_TRACE_JUMP_TARGET)) {
+ chain = nftnl_trace_get_str(nlt, NFTNL_TRACE_JUMP_TARGET);
+ printf(":%s", chain);
+ }
+ break;
+ default:
+ printf("0x%x", verdict);
+ break;
+ }
+
+ printf(" ");
+}
+
+static int trace_cb(const struct nlmsghdr *nlh, struct cb_arg *arg)
+{
+ struct nftnl_trace *nlt;
+ uint32_t verdict;
+
+ nlt = nftnl_trace_alloc();
+ if (nlt == NULL)
+ goto err;
+
+ if (nftnl_trace_nlmsg_parse(nlh, nlt) < 0)
+ goto err_free;
+
+ if (arg->nfproto &&
+ arg->nfproto != nftnl_trace_get_u32(nlt, NFTNL_TABLE_FAMILY))
+ goto err_free;
+
+ printf(" TRACE: %d %08x %s:%s", nftnl_trace_get_u32(nlt, NFTNL_TABLE_FAMILY),
+ nftnl_trace_get_u32(nlt, NFTNL_TRACE_ID),
+ nftnl_trace_get_str(nlt, NFTNL_TRACE_TABLE),
+ nftnl_trace_get_str(nlt, NFTNL_TRACE_CHAIN));
+
+ switch (nftnl_trace_get_u32(nlt, NFTNL_TRACE_TYPE)) {
+ case NFT_TRACETYPE_RULE:
+ verdict = nftnl_trace_get_u32(nlt, NFTNL_TRACE_VERDICT);
+ printf(":rule:0x%llx:", (unsigned long long)nftnl_trace_get_u64(nlt, NFTNL_TRACE_RULE_HANDLE));
+ print_verdict(nlt, verdict);
+
+ if (nftnl_trace_is_set(nlt, NFTNL_TRACE_RULE_HANDLE))
+ trace_print_rule(nlt, arg);
+ if (nftnl_trace_is_set(nlt, NFTNL_TRACE_LL_HEADER) ||
+ nftnl_trace_is_set(nlt, NFTNL_TRACE_NETWORK_HEADER))
+ trace_print_packet(nlt, arg);
+ break;
+ case NFT_TRACETYPE_POLICY:
+ printf(":policy:");
+ verdict = nftnl_trace_get_u32(nlt, NFTNL_TRACE_POLICY);
+
+ print_verdict(nlt, verdict);
+ break;
+ case NFT_TRACETYPE_RETURN:
+ printf(":return:");
+ trace_print_return(nlt);
+ break;
+ }
+ puts("");
+err_free:
+ nftnl_trace_free(nlt);
+err:
+ return MNL_CB_OK;
+}
+
+static int monitor_cb(const struct nlmsghdr *nlh, void *data)
+{
+ uint32_t type = nlh->nlmsg_type & 0xFF;
+ struct cb_arg *arg = data;
+ int ret = MNL_CB_OK;
+
+ switch(type) {
+ case NFT_MSG_NEWTABLE:
+ case NFT_MSG_DELTABLE:
+ ret = table_cb(nlh, data);
+ break;
+ case NFT_MSG_NEWCHAIN:
+ case NFT_MSG_DELCHAIN:
+ ret = chain_cb(nlh, data);
+ break;
+ case NFT_MSG_NEWRULE:
+ case NFT_MSG_DELRULE:
+ arg->is_event = true;
+ ret = rule_cb(nlh, data);
+ break;
+ case NFT_MSG_NEWGEN:
+ ret = newgen_cb(nlh, data);
+ break;
+ case NFT_MSG_TRACE:
+ ret = trace_cb(nlh, data);
+ break;
+ }
+
+ return ret;
+}
+
+static const struct option options[] = {
+ {.name = "counters", .has_arg = false, .val = 'c'},
+ {.name = "trace", .has_arg = false, .val = 't'},
+ {.name = "event", .has_arg = false, .val = 'e'},
+ {.name = "ipv4", .has_arg = false, .val = '4'},
+ {.name = "ipv6", .has_arg = false, .val = '6'},
+ {NULL},
+};
+
+static void print_usage(void)
+{
+ printf("%s %s\n", xtables_globals.program_name,
+ xtables_globals.program_version);
+ printf("Usage: %s [ -t | -e ]\n"
+ " --trace -t trace ruleset traversal of packets tagged via -j TRACE rule\n"
+ " --event -e show events taht modify the ruleset\n"
+ "Optional arguments:\n"
+ " --ipv4 -4 only monitor ipv4\n"
+ " --ipv6 -6 only monitor ipv6\n"
+ " --counters -c show counters in rules\n"
+
+ , xtables_globals.program_name);
+ exit(EXIT_FAILURE);
+}
+
+int xtables_monitor_main(int argc, char *argv[])
+{
+ struct mnl_socket *nl;
+ char buf[MNL_SOCKET_BUFFER_SIZE];
+ uint32_t nfgroup = 0;
+ struct cb_arg cb_arg;
+ int ret, c;
+
+ xtables_globals.program_name = "xtables-monitor";
+ /* XXX xtables_init_all does several things we don't want */
+ c = xtables_init_all(&xtables_globals, NFPROTO_IPV4);
+ if (c < 0) {
+ fprintf(stderr, "%s/%s Failed to initialize xtables\n",
+ xtables_globals.program_name,
+ xtables_globals.program_version);
+ exit(1);
+ }
+#if defined(ALL_INCLUSIVE) || defined(NO_SHARED_LIBS)
+ init_extensions();
+ init_extensions4();
+#endif
+
+ memset(&cb_arg, 0, sizeof(cb_arg));
+ opterr = 0;
+ while ((c = getopt_long(argc, argv, "ceht46", options, NULL)) != -1) {
+ switch (c) {
+ case 'c':
+ counters = true;
+ break;
+ case 't':
+ trace = true;
+ break;
+ case 'e':
+ events = true;
+ break;
+ case 'h':
+ print_usage();
+ exit(0);
+ case '4':
+ cb_arg.nfproto = NFPROTO_IPV4;
+ break;
+ case '6':
+ cb_arg.nfproto = NFPROTO_IPV6;
+ break;
+ default:
+ fprintf(stderr, "xtables-monitor %s: Bad argument.\n", XTABLES_VERSION);
+ fprintf(stderr, "Try `xtables-monitor -h' for more information.");
+ exit(PARAMETER_PROBLEM);
+ }
+ }
+
+ if (trace)
+ nfgroup |= 1 << (NFNLGRP_NFTRACE - 1);
+ if (events)
+ nfgroup |= 1 << (NFNLGRP_NFTABLES - 1);
+
+ if (nfgroup == 0) {
+ print_usage();
+ exit(EXIT_FAILURE);
+ }
+
+ nl = mnl_socket_open(NETLINK_NETFILTER);
+ if (nl == NULL) {
+ perror("cannot open nfnetlink socket");
+ exit(EXIT_FAILURE);
+ }
+
+ if (mnl_socket_bind(nl, nfgroup, MNL_SOCKET_AUTOPID) < 0) {
+ perror("cannot bind to nfnetlink socket");
+ exit(EXIT_FAILURE);
+ }
+
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ while (ret > 0) {
+ ret = mnl_cb_run(buf, ret, 0, 0, monitor_cb, &cb_arg);
+ if (ret <= 0)
+ break;
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ }
+ if (ret == -1) {
+ perror("cannot receive from nfnetlink socket");
+ exit(EXIT_FAILURE);
+ }
+ mnl_socket_close(nl);
+
+ return EXIT_SUCCESS;
+}
+
projects / thirdparty / iptables.git / commitdiff
