--- /dev/null
+/*
+ * libxt_conntrack
+ * Shared library add-on to iptables for conntrack matching support.
+ *
+ * GPL (C) 2001 Marc Boucher (marc@mbsi.ca).
+ * Copyright © CC Computer Consultants GmbH, 2007 - 2008
+ * Jan Engelhardt <jengelh@computergmbh.de>
+ */
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <ctype.h>
+#include <getopt.h>
+#include <netdb.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <iptables.h>
+#include <xtables.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/xt_conntrack.h>
+#include <linux/netfilter/nf_conntrack_common.h>
+#include <arpa/inet.h>
+
+/* Function which prints out usage message. */
+static void conntrack_mt_help(void)
+{
+ printf(
+"conntrack match options:\n"
+"[!] --ctstate {INVALID|ESTABLISHED|NEW|RELATED|UNTRACKED|SNAT|DNAT}[,...]\n"
+" State(s) to match\n"
+"[!] --ctproto proto Protocol to match; by number or name, e.g. \"tcp\"\n"
+"[!] --ctorigsrc address[/mask]\n"
+"[!] --ctorigdst address[/mask]\n"
+"[!] --ctreplsrc address[/mask]\n"
+"[!] --ctrepldst address[/mask]\n"
+" Original/Reply source/destination address\n"
+"[!] --ctorigsrcport port\n"
+"[!] --ctorigdstport port\n"
+"[!] --ctreplsrcport port\n"
+"[!] --ctrepldstport port\n"
+" TCP/UDP/SCTP orig./reply source/destination port\n"
+"[!] --ctstatus {NONE|EXPECTED|SEEN_REPLY|ASSURED|CONFIRMED}[,...]\n"
+" Status(es) to match\n"
+"[!] --ctexpire time[:time] Match remaining lifetime in seconds against\n"
+" value or range of values (inclusive)\n"
+" --ctdir {ORIGINAL|REPLY} Flow direction of packet\n");
+}
+
+static const struct option conntrack_mt_opts_v0[] = {
+ {.name = "ctstate", .has_arg = true, .val = '1'},
+ {.name = "ctproto", .has_arg = true, .val = '2'},
+ {.name = "ctorigsrc", .has_arg = true, .val = '3'},
+ {.name = "ctorigdst", .has_arg = true, .val = '4'},
+ {.name = "ctreplsrc", .has_arg = true, .val = '5'},
+ {.name = "ctrepldst", .has_arg = true, .val = '6'},
+ {.name = "ctstatus", .has_arg = true, .val = '7'},
+ {.name = "ctexpire", .has_arg = true, .val = '8'},
+ { .name = NULL }
+};
+
+static const struct option conntrack_mt_opts[] = {
+ {.name = "ctstate", .has_arg = true, .val = '1'},
+ {.name = "ctproto", .has_arg = true, .val = '2'},
+ {.name = "ctorigsrc", .has_arg = true, .val = '3'},
+ {.name = "ctorigdst", .has_arg = true, .val = '4'},
+ {.name = "ctreplsrc", .has_arg = true, .val = '5'},
+ {.name = "ctrepldst", .has_arg = true, .val = '6'},
+ {.name = "ctstatus", .has_arg = true, .val = '7'},
+ {.name = "ctexpire", .has_arg = true, .val = '8'},
+ {.name = "ctorigsrcport", .has_arg = true, .val = 'a'},
+ {.name = "ctorigdstport", .has_arg = true, .val = 'b'},
+ {.name = "ctreplsrcport", .has_arg = true, .val = 'c'},
+ {.name = "ctrepldstport", .has_arg = true, .val = 'd'},
+ {.name = "ctdir", .has_arg = true, .val = 'e'},
+ {.name = NULL},
+};
+
+static int
+parse_state(const char *state, size_t len, struct xt_conntrack_info *sinfo)
+{
+ if (strncasecmp(state, "INVALID", len) == 0)
+ sinfo->statemask |= XT_CONNTRACK_STATE_INVALID;
+ else if (strncasecmp(state, "NEW", len) == 0)
+ sinfo->statemask |= XT_CONNTRACK_STATE_BIT(IP_CT_NEW);
+ else if (strncasecmp(state, "ESTABLISHED", len) == 0)
+ sinfo->statemask |= XT_CONNTRACK_STATE_BIT(IP_CT_ESTABLISHED);
+ else if (strncasecmp(state, "RELATED", len) == 0)
+ sinfo->statemask |= XT_CONNTRACK_STATE_BIT(IP_CT_RELATED);
+ else if (strncasecmp(state, "UNTRACKED", len) == 0)
+ sinfo->statemask |= XT_CONNTRACK_STATE_UNTRACKED;
+ else if (strncasecmp(state, "SNAT", len) == 0)
+ sinfo->statemask |= XT_CONNTRACK_STATE_SNAT;
+ else if (strncasecmp(state, "DNAT", len) == 0)
+ sinfo->statemask |= XT_CONNTRACK_STATE_DNAT;
+ else
+ return 0;
+ return 1;
+}
+
+static void
+parse_states(const char *arg, struct xt_conntrack_info *sinfo)
+{
+ const char *comma;
+
+ while ((comma = strchr(arg, ',')) != NULL) {
+ if (comma == arg || !parse_state(arg, comma-arg, sinfo))
+ exit_error(PARAMETER_PROBLEM, "Bad ctstate `%s'", arg);
+ arg = comma+1;
+ }
+
+ if (strlen(arg) == 0 || !parse_state(arg, strlen(arg), sinfo))
+ exit_error(PARAMETER_PROBLEM, "Bad ctstate `%s'", arg);
+}
+
+static bool
+conntrack_ps_state(struct xt_conntrack_mtinfo1 *info, const char *state,
+ size_t z)
+{
+ if (strncasecmp(state, "INVALID", z) == 0)
+ info->state_mask |= XT_CONNTRACK_STATE_INVALID;
+ else if (strncasecmp(state, "NEW", z) == 0)
+ info->state_mask |= XT_CONNTRACK_STATE_BIT(IP_CT_NEW);
+ else if (strncasecmp(state, "ESTABLISHED", z) == 0)
+ info->state_mask |= XT_CONNTRACK_STATE_BIT(IP_CT_ESTABLISHED);
+ else if (strncasecmp(state, "RELATED", z) == 0)
+ info->state_mask |= XT_CONNTRACK_STATE_BIT(IP_CT_RELATED);
+ else if (strncasecmp(state, "UNTRACKED", z) == 0)
+ info->state_mask |= XT_CONNTRACK_STATE_UNTRACKED;
+ else if (strncasecmp(state, "SNAT", z) == 0)
+ info->state_mask |= XT_CONNTRACK_STATE_SNAT;
+ else if (strncasecmp(state, "DNAT", z) == 0)
+ info->state_mask |= XT_CONNTRACK_STATE_DNAT;
+ else
+ return false;
+ return true;
+}
+
+static void
+conntrack_ps_states(struct xt_conntrack_mtinfo1 *info, const char *arg)
+{
+ const char *comma;
+
+ while ((comma = strchr(arg, ',')) != NULL) {
+ if (comma == arg || !conntrack_ps_state(info, arg, comma - arg))
+ exit_error(PARAMETER_PROBLEM,
+ "Bad ctstate \"%s\"", arg);
+ arg = comma + 1;
+ }
+
+ if (strlen(arg) == 0 || !conntrack_ps_state(info, arg, strlen(arg)))
+ exit_error(PARAMETER_PROBLEM, "Bad ctstate \"%s\"", arg);
+}
+
+static int
+parse_status(const char *status, size_t len, struct xt_conntrack_info *sinfo)
+{
+ if (strncasecmp(status, "NONE", len) == 0)
+ sinfo->statusmask |= 0;
+ else if (strncasecmp(status, "EXPECTED", len) == 0)
+ sinfo->statusmask |= IPS_EXPECTED;
+ else if (strncasecmp(status, "SEEN_REPLY", len) == 0)
+ sinfo->statusmask |= IPS_SEEN_REPLY;
+ else if (strncasecmp(status, "ASSURED", len) == 0)
+ sinfo->statusmask |= IPS_ASSURED;
+#ifdef IPS_CONFIRMED
+ else if (strncasecmp(status, "CONFIRMED", len) == 0)
+ sinfo->statusmask |= IPS_CONFIRMED;
+#endif
+ else
+ return 0;
+ return 1;
+}
+
+static void
+parse_statuses(const char *arg, struct xt_conntrack_info *sinfo)
+{
+ const char *comma;
+
+ while ((comma = strchr(arg, ',')) != NULL) {
+ if (comma == arg || !parse_status(arg, comma-arg, sinfo))
+ exit_error(PARAMETER_PROBLEM, "Bad ctstatus `%s'", arg);
+ arg = comma+1;
+ }
+
+ if (strlen(arg) == 0 || !parse_status(arg, strlen(arg), sinfo))
+ exit_error(PARAMETER_PROBLEM, "Bad ctstatus `%s'", arg);
+}
+
+static bool
+conntrack_ps_status(struct xt_conntrack_mtinfo1 *info, const char *status,
+ size_t z)
+{
+ if (strncasecmp(status, "NONE", z) == 0)
+ info->status_mask |= 0;
+ else if (strncasecmp(status, "EXPECTED", z) == 0)
+ info->status_mask |= IPS_EXPECTED;
+ else if (strncasecmp(status, "SEEN_REPLY", z) == 0)
+ info->status_mask |= IPS_SEEN_REPLY;
+ else if (strncasecmp(status, "ASSURED", z) == 0)
+ info->status_mask |= IPS_ASSURED;
+ else if (strncasecmp(status, "CONFIRMED", z) == 0)
+ info->status_mask |= IPS_CONFIRMED;
+ else
+ return false;
+ return true;
+}
+
+static void
+conntrack_ps_statuses(struct xt_conntrack_mtinfo1 *info, const char *arg)
+{
+ const char *comma;
+
+ while ((comma = strchr(arg, ',')) != NULL) {
+ if (comma == arg || !conntrack_ps_status(info, arg, comma - arg))
+ exit_error(PARAMETER_PROBLEM,
+ "Bad ctstatus \"%s\"", arg);
+ arg = comma + 1;
+ }
+
+ if (strlen(arg) == 0 || !conntrack_ps_status(info, arg, strlen(arg)))
+ exit_error(PARAMETER_PROBLEM, "Bad ctstatus \"%s\"", arg);
+}
+
+static unsigned long
+parse_expire(const char *s)
+{
+ unsigned int len;
+
+ if (string_to_number(s, 0, 0, &len) == -1)
+ exit_error(PARAMETER_PROBLEM, "expire value invalid: `%s'\n", s);
+ else
+ return len;
+}
+
+/* If a single value is provided, min and max are both set to the value */
+static void
+parse_expires(const char *s, struct xt_conntrack_info *sinfo)
+{
+ char *buffer;
+ char *cp;
+
+ buffer = strdup(s);
+ if ((cp = strchr(buffer, ':')) == NULL)
+ sinfo->expires_min = sinfo->expires_max =
+ parse_expire(buffer);
+ else {
+ *cp = '\0';
+ cp++;
+
+ sinfo->expires_min = buffer[0] ? parse_expire(buffer) : 0;
+ sinfo->expires_max = cp[0]
+ ? parse_expire(cp)
+ : (unsigned long)-1;
+ }
+ free(buffer);
+
+ if (sinfo->expires_min > sinfo->expires_max)
+ exit_error(PARAMETER_PROBLEM,
+ "expire min. range value `%lu' greater than max. "
+ "range value `%lu'", sinfo->expires_min, sinfo->expires_max);
+}
+
+static void
+conntrack_ps_expires(struct xt_conntrack_mtinfo1 *info, const char *s)
+{
+ unsigned int min, max;
+ char *end;
+
+ if (!strtonum(s, &end, &min, 0, ~0))
+ param_act(P_BAD_VALUE, "conntrack", "--expires", s);
+ max = min;
+ if (*end == ':')
+ if (!strtonum(s, &end, &max, 0, ~0U))
+ param_act(P_BAD_VALUE, "conntrack", "--expires", s);
+ if (*end != '\0')
+ param_act(P_BAD_VALUE, "conntrack", "--expires", s);
+
+ if (min > max)
+ exit_error(PARAMETER_PROBLEM,
+ "expire min. range value \"%u\" greater than max. "
+ "range value \"%u\"", min, max);
+
+ info->expires_min = min;
+ info->expires_max = max;
+}
+
+/* Function which parses command options; returns true if it
+ ate an option */
+static int conntrack_parse(int c, char **argv, int invert, unsigned int *flags,
+ const void *entry, struct xt_entry_match **match)
+{
+ struct xt_conntrack_info *sinfo = (void *)(*match)->data;
+ char *protocol = NULL;
+ unsigned int naddrs = 0;
+ struct in_addr *addrs = NULL;
+
+
+ switch (c) {
+ case '1':
+ check_inverse(optarg, &invert, &optind, 0);
+
+ parse_states(argv[optind-1], sinfo);
+ if (invert) {
+ sinfo->invflags |= XT_CONNTRACK_STATE;
+ }
+ sinfo->flags |= XT_CONNTRACK_STATE;
+ break;
+
+ case '2':
+ check_inverse(optarg, &invert, &optind, 0);
+
+ if(invert)
+ sinfo->invflags |= XT_CONNTRACK_PROTO;
+
+ /* Canonicalize into lower case */
+ for (protocol = argv[optind-1]; *protocol; protocol++)
+ *protocol = tolower(*protocol);
+
+ protocol = argv[optind-1];
+ sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.protonum = parse_protocol(protocol);
+
+ if (sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.protonum == 0
+ && (sinfo->invflags & XT_INV_PROTO))
+ exit_error(PARAMETER_PROBLEM,
+ "rule would never match protocol");
+
+ sinfo->flags |= XT_CONNTRACK_PROTO;
+ break;
+
+ case '3':
+ check_inverse(optarg, &invert, &optind, 0);
+
+ if (invert)
+ sinfo->invflags |= XT_CONNTRACK_ORIGSRC;
+
+ ipparse_hostnetworkmask(argv[optind-1], &addrs,
+ &sinfo->sipmsk[IP_CT_DIR_ORIGINAL],
+ &naddrs);
+ if(naddrs > 1)
+ exit_error(PARAMETER_PROBLEM,
+ "multiple IP addresses not allowed");
+
+ if(naddrs == 1) {
+ sinfo->tuple[IP_CT_DIR_ORIGINAL].src.ip = addrs[0].s_addr;
+ }
+
+ sinfo->flags |= XT_CONNTRACK_ORIGSRC;
+ break;
+
+ case '4':
+ check_inverse(optarg, &invert, &optind, 0);
+
+ if (invert)
+ sinfo->invflags |= XT_CONNTRACK_ORIGDST;
+
+ ipparse_hostnetworkmask(argv[optind-1], &addrs,
+ &sinfo->dipmsk[IP_CT_DIR_ORIGINAL],
+ &naddrs);
+ if(naddrs > 1)
+ exit_error(PARAMETER_PROBLEM,
+ "multiple IP addresses not allowed");
+
+ if(naddrs == 1) {
+ sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.ip = addrs[0].s_addr;
+ }
+
+ sinfo->flags |= XT_CONNTRACK_ORIGDST;
+ break;
+
+ case '5':
+ check_inverse(optarg, &invert, &optind, 0);
+
+ if (invert)
+ sinfo->invflags |= XT_CONNTRACK_REPLSRC;
+
+ ipparse_hostnetworkmask(argv[optind-1], &addrs,
+ &sinfo->sipmsk[IP_CT_DIR_REPLY],
+ &naddrs);
+ if(naddrs > 1)
+ exit_error(PARAMETER_PROBLEM,
+ "multiple IP addresses not allowed");
+
+ if(naddrs == 1) {
+ sinfo->tuple[IP_CT_DIR_REPLY].src.ip = addrs[0].s_addr;
+ }
+
+ sinfo->flags |= XT_CONNTRACK_REPLSRC;
+ break;
+
+ case '6':
+ check_inverse(optarg, &invert, &optind, 0);
+
+ if (invert)
+ sinfo->invflags |= XT_CONNTRACK_REPLDST;
+
+ ipparse_hostnetworkmask(argv[optind-1], &addrs,
+ &sinfo->dipmsk[IP_CT_DIR_REPLY],
+ &naddrs);
+ if(naddrs > 1)
+ exit_error(PARAMETER_PROBLEM,
+ "multiple IP addresses not allowed");
+
+ if(naddrs == 1) {
+ sinfo->tuple[IP_CT_DIR_REPLY].dst.ip = addrs[0].s_addr;
+ }
+
+ sinfo->flags |= XT_CONNTRACK_REPLDST;
+ break;
+
+ case '7':
+ check_inverse(optarg, &invert, &optind, 0);
+
+ parse_statuses(argv[optind-1], sinfo);
+ if (invert) {
+ sinfo->invflags |= XT_CONNTRACK_STATUS;
+ }
+ sinfo->flags |= XT_CONNTRACK_STATUS;
+ break;
+
+ case '8':
+ check_inverse(optarg, &invert, &optind, 0);
+
+ parse_expires(argv[optind-1], sinfo);
+ if (invert) {
+ sinfo->invflags |= XT_CONNTRACK_EXPIRES;
+ }
+ sinfo->flags |= XT_CONNTRACK_EXPIRES;
+ break;
+
+ default:
+ return 0;
+ }
+
+ *flags = sinfo->flags;
+ return 1;
+}
+
+static int
+conntrack_mt_parse(int c, char **argv, int invert, unsigned int *flags,
+ struct xt_entry_match **match)
+{
+ struct xt_conntrack_mtinfo1 *info = (void *)(*match)->data;
+ unsigned int port;
+ char *p;
+
+ switch (c) {
+ case '1': /* --ctstate */
+ conntrack_ps_states(info, optarg);
+ info->match_flags |= XT_CONNTRACK_STATE;
+ if (invert)
+ info->invert_flags |= XT_CONNTRACK_STATE;
+ break;
+
+ case '2': /* --ctproto */
+ /* Canonicalize into lower case */
+ for (p = optarg; *p != '\0'; ++p)
+ *p = tolower(*p);
+ info->l4proto = parse_protocol(optarg);
+
+ if (info->l4proto == 0 && (info->invert_flags & XT_INV_PROTO))
+ exit_error(PARAMETER_PROBLEM, "conntrack: rule would "
+ "never match protocol");
+
+ info->match_flags |= XT_CONNTRACK_PROTO;
+ if (invert)
+ info->invert_flags |= XT_CONNTRACK_PROTO;
+ break;
+
+ case '7': /* --ctstatus */
+ conntrack_ps_statuses(info, optarg);
+ info->match_flags |= XT_CONNTRACK_STATUS;
+ if (invert)
+ info->invert_flags |= XT_CONNTRACK_STATUS;
+ break;
+
+ case '8': /* --ctexpire */
+ conntrack_ps_expires(info, optarg);
+ info->match_flags |= XT_CONNTRACK_EXPIRES;
+ if (invert)
+ info->invert_flags |= XT_CONNTRACK_EXPIRES;
+ break;
+
+ case 'a': /* --ctorigsrcport */
+ if (!strtonum(optarg, NULL, &port, 0, ~(u_int16_t)0))
+ param_act(P_BAD_VALUE, "conntrack",
+ "--ctorigsrcport", optarg);
+ info->match_flags |= XT_CONNTRACK_ORIGSRC_PORT;
+ info->origsrc_port = htons(port);
+ if (invert)
+ info->invert_flags |= XT_CONNTRACK_ORIGSRC_PORT;
+ break;
+
+ case 'b': /* --ctorigdstport */
+ if (!strtonum(optarg, NULL, &port, 0, ~(u_int16_t)0))
+ param_act(P_BAD_VALUE, "conntrack",
+ "--ctorigdstport", optarg);
+ info->match_flags |= XT_CONNTRACK_ORIGDST_PORT;
+ info->origdst_port = htons(port);
+ if (invert)
+ info->invert_flags |= XT_CONNTRACK_ORIGDST_PORT;
+ break;
+
+ case 'c': /* --ctreplsrcport */
+ if (!strtonum(optarg, NULL, &port, 0, ~(u_int16_t)0))
+ param_act(P_BAD_VALUE, "conntrack",
+ "--ctreplsrcport", optarg);
+ info->match_flags |= XT_CONNTRACK_REPLSRC_PORT;
+ info->replsrc_port = htons(port);
+ if (invert)
+ info->invert_flags |= XT_CONNTRACK_REPLSRC_PORT;
+ break;
+
+ case 'd': /* --ctrepldstport */
+ if (!strtonum(optarg, NULL, &port, 0, ~(u_int16_t)0))
+ param_act(P_BAD_VALUE, "conntrack",
+ "--ctrepldstport", optarg);
+ info->match_flags |= XT_CONNTRACK_REPLDST_PORT;
+ info->repldst_port = htons(port);
+ if (invert)
+ info->invert_flags |= XT_CONNTRACK_REPLDST_PORT;
+ break;
+
+ case 'e': /* --ctdir */
+ param_act(P_NO_INVERT, "conntrack", "--ctdir", invert);
+ if (strcasecmp(optarg, "ORIGINAL") == 0) {
+ info->match_flags |= XT_CONNTRACK_DIRECTION;
+ info->invert_flags &= ~XT_CONNTRACK_DIRECTION;
+ } else if (strcasecmp(optarg, "REPLY") == 0) {
+ info->match_flags |= XT_CONNTRACK_DIRECTION;
+ info->invert_flags |= XT_CONNTRACK_DIRECTION;
+ } else {
+ param_act(P_BAD_VALUE, "conntrack", "--ctdir", optarg);
+ }
+ break;
+
+ default:
+ return false;
+ }
+
+ *flags = info->match_flags;
+ return true;
+}
+
+static int
+conntrack_mt4_parse(int c, char **argv, int invert, unsigned int *flags,
+ const void *entry, struct xt_entry_match **match)
+{
+ struct xt_conntrack_mtinfo1 *info = (void *)(*match)->data;
+ struct in_addr *addr = NULL;
+ unsigned int naddrs = 0;
+
+ switch (c) {
+ case '3': /* --ctorigsrc */
+ ipparse_hostnetworkmask(optarg, &addr, &info->origsrc_mask.in,
+ &naddrs);
+ if (naddrs > 1)
+ exit_error(PARAMETER_PROBLEM,
+ "multiple IP addresses not allowed");
+ if (naddrs == 1)
+ memcpy(&info->origsrc_addr.in, addr, sizeof(*addr));
+ info->match_flags |= XT_CONNTRACK_ORIGSRC;
+ if (invert)
+ info->invert_flags |= XT_CONNTRACK_ORIGSRC;
+ break;
+
+ case '4': /* --ctorigdst */
+ ipparse_hostnetworkmask(optarg, &addr, &info->origdst_mask.in,
+ &naddrs);
+ if (naddrs > 1)
+ exit_error(PARAMETER_PROBLEM,
+ "multiple IP addresses not allowed");
+ if (naddrs == 1)
+ memcpy(&info->origdst_addr.in, addr, sizeof(*addr));
+ info->match_flags |= XT_CONNTRACK_ORIGDST;
+ if (invert)
+ info->invert_flags |= XT_CONNTRACK_ORIGDST;
+ break;
+
+ case '5': /* --ctreplsrc */
+ ipparse_hostnetworkmask(optarg, &addr, &info->replsrc_mask.in,
+ &naddrs);
+ if (naddrs > 1)
+ exit_error(PARAMETER_PROBLEM,
+ "multiple IP addresses not allowed");
+ if (naddrs == 1)
+ memcpy(&info->replsrc_addr.in, addr, sizeof(*addr));
+ info->match_flags |= XT_CONNTRACK_REPLSRC;
+ if (invert)
+ info->invert_flags |= XT_CONNTRACK_REPLSRC;
+ break;
+
+ case '6': /* --ctrepldst */
+ ipparse_hostnetworkmask(optarg, &addr, &info->repldst_mask.in,
+ &naddrs);
+ if (naddrs > 1)
+ exit_error(PARAMETER_PROBLEM,
+ "multiple IP addresses not allowed");
+ if (naddrs == 1)
+ memcpy(&info->repldst_addr.in, addr, sizeof(*addr));
+ info->match_flags |= XT_CONNTRACK_REPLDST;
+ if (invert)
+ info->invert_flags |= XT_CONNTRACK_REPLDST;
+ break;
+
+
+ default:
+ return conntrack_mt_parse(c, argv, invert, flags, match);
+ }
+
+ *flags = info->match_flags;
+ return true;
+}
+
+static int
+conntrack_mt6_parse(int c, char **argv, int invert, unsigned int *flags,
+ const void *entry, struct xt_entry_match **match)
+{
+ struct xt_conntrack_mtinfo1 *info = (void *)(*match)->data;
+ struct in6_addr *addr = NULL;
+ unsigned int naddrs = 0;
+
+ switch (c) {
+ case '3': /* --ctorigsrc */
+ ip6parse_hostnetworkmask(optarg, &addr,
+ &info->origsrc_mask.in6, &naddrs);
+ if (naddrs > 1)
+ exit_error(PARAMETER_PROBLEM,
+ "multiple IP addresses not allowed");
+ if (naddrs == 1)
+ memcpy(&info->origsrc_addr.in6, addr, sizeof(*addr));
+ info->match_flags |= XT_CONNTRACK_ORIGSRC;
+ if (invert)
+ info->invert_flags |= XT_CONNTRACK_ORIGSRC;
+ break;
+
+ case '4': /* --ctorigdst */
+ ip6parse_hostnetworkmask(optarg, &addr,
+ &info->origdst_mask.in6, &naddrs);
+ if (naddrs > 1)
+ exit_error(PARAMETER_PROBLEM,
+ "multiple IP addresses not allowed");
+ if (naddrs == 1)
+ memcpy(&info->origdst_addr.in, addr, sizeof(*addr));
+ info->match_flags |= XT_CONNTRACK_ORIGDST;
+ if (invert)
+ info->invert_flags |= XT_CONNTRACK_ORIGDST;
+ break;
+
+ case '5': /* --ctreplsrc */
+ ip6parse_hostnetworkmask(optarg, &addr,
+ &info->replsrc_mask.in6, &naddrs);
+ if (naddrs > 1)
+ exit_error(PARAMETER_PROBLEM,
+ "multiple IP addresses not allowed");
+ if (naddrs == 1)
+ memcpy(&info->replsrc_addr.in, addr, sizeof(*addr));
+ info->match_flags |= XT_CONNTRACK_REPLSRC;
+ if (invert)
+ info->invert_flags |= XT_CONNTRACK_REPLSRC;
+ break;
+
+ case '6': /* --ctrepldst */
+ ip6parse_hostnetworkmask(optarg, &addr,
+ &info->repldst_mask.in6, &naddrs);
+ if (naddrs > 1)
+ exit_error(PARAMETER_PROBLEM,
+ "multiple IP addresses not allowed");
+ if (naddrs == 1)
+ memcpy(&info->repldst_addr.in, addr, sizeof(*addr));
+ info->match_flags |= XT_CONNTRACK_REPLDST;
+ if (invert)
+ info->invert_flags |= XT_CONNTRACK_REPLDST;
+ break;
+
+
+ default:
+ return conntrack_mt_parse(c, argv, invert, flags, match);
+ }
+
+ *flags = info->match_flags;
+ return true;
+}
+
+static void conntrack_mt_check(unsigned int flags)
+{
+ if (flags == 0)
+ exit_error(PARAMETER_PROBLEM, "conntrack: At least one option "
+ "is required");
+}
+
+static void
+print_state(unsigned int statemask)
+{
+ const char *sep = "";
+
+ if (statemask & XT_CONNTRACK_STATE_INVALID) {
+ printf("%sINVALID", sep);
+ sep = ",";
+ }
+ if (statemask & XT_CONNTRACK_STATE_BIT(IP_CT_NEW)) {
+ printf("%sNEW", sep);
+ sep = ",";
+ }
+ if (statemask & XT_CONNTRACK_STATE_BIT(IP_CT_RELATED)) {
+ printf("%sRELATED", sep);
+ sep = ",";
+ }
+ if (statemask & XT_CONNTRACK_STATE_BIT(IP_CT_ESTABLISHED)) {
+ printf("%sESTABLISHED", sep);
+ sep = ",";
+ }
+ if (statemask & XT_CONNTRACK_STATE_UNTRACKED) {
+ printf("%sUNTRACKED", sep);
+ sep = ",";
+ }
+ if (statemask & XT_CONNTRACK_STATE_SNAT) {
+ printf("%sSNAT", sep);
+ sep = ",";
+ }
+ if (statemask & XT_CONNTRACK_STATE_DNAT) {
+ printf("%sDNAT", sep);
+ sep = ",";
+ }
+ printf(" ");
+}
+
+static void
+print_status(unsigned int statusmask)
+{
+ const char *sep = "";
+
+ if (statusmask & IPS_EXPECTED) {
+ printf("%sEXPECTED", sep);
+ sep = ",";
+ }
+ if (statusmask & IPS_SEEN_REPLY) {
+ printf("%sSEEN_REPLY", sep);
+ sep = ",";
+ }
+ if (statusmask & IPS_ASSURED) {
+ printf("%sASSURED", sep);
+ sep = ",";
+ }
+ if (statusmask & IPS_CONFIRMED) {
+ printf("%sCONFIRMED", sep);
+ sep = ",";
+ }
+ if (statusmask == 0)
+ printf("%sNONE", sep);
+ printf(" ");
+}
+
+static void
+conntrack_dump_addr(const union nf_inet_addr *addr,
+ const union nf_inet_addr *mask,
+ unsigned int family, bool numeric)
+{
+ if (family == AF_INET) {
+ if (!numeric && addr->ip == 0) {
+ printf("anywhere ");
+ return;
+ }
+ printf("%s ", ipaddr_to_anyname(&addr->in));
+ } else if (family == AF_INET6) {
+ if (!numeric && addr->ip6[0] == 0 && addr->ip6[1] == 0 &&
+ addr->ip6[2] == 0 && addr->ip6[3] == 0) {
+ printf("anywhere ");
+ return;
+ }
+ printf("%s ", ip6addr_to_anyname(&addr->in6));
+ }
+}
+
+static void
+print_addr(struct in_addr *addr, struct in_addr *mask, int inv, int numeric)
+{
+ char buf[BUFSIZ];
+
+ if (inv)
+ printf("! ");
+
+ if (mask->s_addr == 0L && !numeric)
+ printf("%s ", "anywhere");
+ else {
+ if (numeric)
+ sprintf(buf, "%s", ipaddr_to_numeric(addr));
+ else
+ sprintf(buf, "%s", ipaddr_to_anyname(addr));
+ strcat(buf, ipmask_to_numeric(mask));
+ printf("%s ", buf);
+ }
+}
+
+/* Saves the matchinfo in parsable form to stdout. */
+static void
+matchinfo_print(const void *ip, const struct xt_entry_match *match, int numeric, const char *optpfx)
+{
+ struct xt_conntrack_info *sinfo = (void *)match->data;
+
+ if(sinfo->flags & XT_CONNTRACK_STATE) {
+ if (sinfo->invflags & XT_CONNTRACK_STATE)
+ printf("! ");
+ printf("%sctstate ", optpfx);
+ print_state(sinfo->statemask);
+ }
+
+ if(sinfo->flags & XT_CONNTRACK_PROTO) {
+ if (sinfo->invflags & XT_CONNTRACK_PROTO)
+ printf("! ");
+ printf("%sctproto ", optpfx);
+ printf("%u ", sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.protonum);
+ }
+
+ if(sinfo->flags & XT_CONNTRACK_ORIGSRC) {
+ if (sinfo->invflags & XT_CONNTRACK_ORIGSRC)
+ printf("! ");
+ printf("%sctorigsrc ", optpfx);
+
+ print_addr(
+ (struct in_addr *)&sinfo->tuple[IP_CT_DIR_ORIGINAL].src.ip,
+ &sinfo->sipmsk[IP_CT_DIR_ORIGINAL],
+ false,
+ numeric);
+ }
+
+ if(sinfo->flags & XT_CONNTRACK_ORIGDST) {
+ if (sinfo->invflags & XT_CONNTRACK_ORIGDST)
+ printf("! ");
+ printf("%sctorigdst ", optpfx);
+
+ print_addr(
+ (struct in_addr *)&sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.ip,
+ &sinfo->dipmsk[IP_CT_DIR_ORIGINAL],
+ false,
+ numeric);
+ }
+
+ if(sinfo->flags & XT_CONNTRACK_REPLSRC) {
+ if (sinfo->invflags & XT_CONNTRACK_REPLSRC)
+ printf("! ");
+ printf("%sctreplsrc ", optpfx);
+
+ print_addr(
+ (struct in_addr *)&sinfo->tuple[IP_CT_DIR_REPLY].src.ip,
+ &sinfo->sipmsk[IP_CT_DIR_REPLY],
+ false,
+ numeric);
+ }
+
+ if(sinfo->flags & XT_CONNTRACK_REPLDST) {
+ if (sinfo->invflags & XT_CONNTRACK_REPLDST)
+ printf("! ");
+ printf("%sctrepldst ", optpfx);
+
+ print_addr(
+ (struct in_addr *)&sinfo->tuple[IP_CT_DIR_REPLY].dst.ip,
+ &sinfo->dipmsk[IP_CT_DIR_REPLY],
+ false,
+ numeric);
+ }
+
+ if(sinfo->flags & XT_CONNTRACK_STATUS) {
+ if (sinfo->invflags & XT_CONNTRACK_STATUS)
+ printf("! ");
+ printf("%sctstatus ", optpfx);
+ print_status(sinfo->statusmask);
+ }
+
+ if(sinfo->flags & XT_CONNTRACK_EXPIRES) {
+ if (sinfo->invflags & XT_CONNTRACK_EXPIRES)
+ printf("! ");
+ printf("%sctexpire ", optpfx);
+
+ if (sinfo->expires_max == sinfo->expires_min)
+ printf("%lu ", sinfo->expires_min);
+ else
+ printf("%lu:%lu ", sinfo->expires_min, sinfo->expires_max);
+ }
+}
+
+static void
+conntrack_dump(const struct xt_conntrack_mtinfo1 *info, const char *prefix,
+ unsigned int family, bool numeric)
+{
+ if (info->match_flags & XT_CONNTRACK_STATE) {
+ if (info->invert_flags & XT_CONNTRACK_STATE)
+ printf("! ");
+ printf("%sctstate ", prefix);
+ print_state(info->state_mask);
+ }
+
+ if (info->match_flags & XT_CONNTRACK_PROTO) {
+ if (info->invert_flags & XT_CONNTRACK_PROTO)
+ printf("! ");
+ printf("%sctproto %u ", prefix, info->l4proto);
+ }
+
+ if (info->match_flags & XT_CONNTRACK_ORIGSRC) {
+ if (info->invert_flags & XT_CONNTRACK_PROTO)
+ printf("! ");
+ printf("%sctorigsrc ", prefix);
+ conntrack_dump_addr(&info->origsrc_addr, &info->origsrc_mask,
+ family, numeric);
+ }
+
+ if (info->match_flags & XT_CONNTRACK_ORIGDST) {
+ if (info->invert_flags & XT_CONNTRACK_PROTO)
+ printf("! ");
+ printf("%sctorigdst ", prefix);
+ conntrack_dump_addr(&info->origdst_addr, &info->origdst_mask,
+ family, numeric);
+ }
+
+ if (info->match_flags & XT_CONNTRACK_REPLSRC) {
+ if (info->invert_flags & XT_CONNTRACK_PROTO)
+ printf("! ");
+ printf("%sctreplsrc ", prefix);
+ conntrack_dump_addr(&info->replsrc_addr, &info->replsrc_mask,
+ family, numeric);
+ }
+
+ if (info->match_flags & XT_CONNTRACK_REPLDST) {
+ if (info->invert_flags & XT_CONNTRACK_PROTO)
+ printf("! ");
+ printf("%sctrepldst ", prefix);
+ conntrack_dump_addr(&info->repldst_addr, &info->repldst_mask,
+ family, numeric);
+ }
+
+ if (info->match_flags & XT_CONNTRACK_ORIGSRC_PORT) {
+ if (info->invert_flags & XT_CONNTRACK_ORIGSRC_PORT)
+ printf("! ");
+ printf("%sctorigsrcport %u ", prefix,
+ ntohs(info->origsrc_port));
+ }
+
+ if (info->match_flags & XT_CONNTRACK_ORIGDST_PORT) {
+ if (info->invert_flags & XT_CONNTRACK_ORIGDST_PORT)
+ printf("! ");
+ printf("%sctorigdstport %u ", prefix,
+ ntohs(info->origdst_port));
+ }
+
+ if (info->match_flags & XT_CONNTRACK_REPLSRC_PORT) {
+ if (info->invert_flags & XT_CONNTRACK_REPLSRC_PORT)
+ printf("! ");
+ printf("%sctreplsrcport %u ", prefix,
+ ntohs(info->replsrc_port));
+ }
+
+ if (info->match_flags & XT_CONNTRACK_REPLDST_PORT) {
+ if (info->invert_flags & XT_CONNTRACK_REPLDST_PORT)
+ printf("! ");
+ printf("%sctrepldstport %u ", prefix,
+ ntohs(info->repldst_port));
+ }
+
+ if (info->match_flags & XT_CONNTRACK_STATUS) {
+ if (info->invert_flags & XT_CONNTRACK_STATUS)
+ printf("! ");
+ printf("%sctstatus ", prefix);
+ print_status(info->status_mask);
+ }
+
+ if (info->match_flags & XT_CONNTRACK_EXPIRES) {
+ if (info->invert_flags & XT_CONNTRACK_EXPIRES)
+ printf("! ");
+ printf("%sctexpire ", prefix);
+
+ if (info->expires_max == info->expires_min)
+ printf("%u ", (unsigned int)info->expires_min);
+ else
+ printf("%u:%u ", (unsigned int)info->expires_min,
+ (unsigned int)info->expires_max);
+ }
+}
+
+/* Prints out the matchinfo. */
+static void conntrack_print(const void *ip, const struct xt_entry_match *match,
+ int numeric)
+{
+ matchinfo_print(ip, match, numeric, "");
+}
+
+static void
+conntrack_mt_print(const void *ip, const struct xt_entry_match *match,
+ int numeric)
+{
+ conntrack_dump((const void *)match->data, "", AF_INET, numeric);
+}
+
+static void
+conntrack_mt6_print(const void *ip, const struct xt_entry_match *match,
+ int numeric)
+{
+ conntrack_dump((const void *)match->data, "", AF_INET6, numeric);
+}
+
+/* Saves the matchinfo in parsable form to stdout. */
+static void conntrack_save(const void *ip, const struct xt_entry_match *match)
+{
+ matchinfo_print(ip, match, 1, "--");
+}
+
+static void conntrack_mt_save(const void *ip,
+ const struct xt_entry_match *match)
+{
+ conntrack_dump((const void *)match->data, "--", AF_INET, true);
+}
+
+static void conntrack_mt6_save(const void *ip,
+ const struct xt_entry_match *match)
+{
+ conntrack_dump((const void *)match->data, "--", AF_INET6, true);
+}
+
+static struct xtables_match conntrack_match = {
+ .version = XTABLES_VERSION,
+ .name = "conntrack",
+ .revision = 0,
+ .family = AF_INET,
+ .size = XT_ALIGN(sizeof(struct xt_conntrack_info)),
+ .userspacesize = XT_ALIGN(sizeof(struct xt_conntrack_info)),
+ .help = conntrack_mt_help,
+ .parse = conntrack_parse,
+ .final_check = conntrack_mt_check,
+ .print = conntrack_print,
+ .save = conntrack_save,
+ .extra_opts = conntrack_mt_opts_v0,
+};
+
+static struct xtables_match conntrack_mt_reg = {
+ .version = XTABLES_VERSION,
+ .name = "conntrack",
+ .revision = 1,
+ .family = AF_INET,
+ .size = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo1)),
+ .userspacesize = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo1)),
+ .help = conntrack_mt_help,
+ .parse = conntrack_mt4_parse,
+ .final_check = conntrack_mt_check,
+ .print = conntrack_mt_print,
+ .save = conntrack_mt_save,
+ .extra_opts = conntrack_mt_opts,
+};
+
+static struct xtables_match conntrack_mt6_reg = {
+ .version = XTABLES_VERSION,
+ .name = "conntrack",
+ .revision = 1,
+ .family = AF_INET6,
+ .size = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo1)),
+ .userspacesize = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo1)),
+ .help = conntrack_mt_help,
+ .parse = conntrack_mt6_parse,
+ .final_check = conntrack_mt_check,
+ .print = conntrack_mt6_print,
+ .save = conntrack_mt6_save,
+ .extra_opts = conntrack_mt_opts,
+};
+
+void _init(void)
+{
+ xtables_register_match(&conntrack_match);
+ xtables_register_match(&conntrack_mt_reg);
+ xtables_register_match(&conntrack_mt6_reg);
+}
git://git.onelab.eu / iptables.git / blobdiff