libxt_conntrack r0
Move libipt_conntrack to libxt_conntrack.
Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de>
diff --git a/extensions/libxt_conntrack.c b/extensions/libxt_conntrack.c
new file mode 100644
index 0000000..a4f9e12
--- /dev/null
+++ b/extensions/libxt_conntrack.c
@@ -0,0 +1,517 @@
+/* Shared library add-on to iptables for conntrack matching support.
+ * GPL (C) 2001 Marc Boucher (marc@mbsi.ca).
+ */
+
+#include <ctype.h>
+#include <getopt.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <iptables.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/xt_conntrack.h>
+#include <linux/netfilter/nf_conntrack_common.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"
+"[!] --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"
+"\n");
+}
+
+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'},
+ {},
+};
+
+static int
+parse_state(const char *state, size_t strlen, struct xt_conntrack_info *sinfo)
+{
+ if (strncasecmp(state, "INVALID", strlen) == 0)
+ sinfo->statemask |= XT_CONNTRACK_STATE_INVALID;
+ else if (strncasecmp(state, "NEW", strlen) == 0)
+ sinfo->statemask |= XT_CONNTRACK_STATE_BIT(IP_CT_NEW);
+ else if (strncasecmp(state, "ESTABLISHED", strlen) == 0)
+ sinfo->statemask |= XT_CONNTRACK_STATE_BIT(IP_CT_ESTABLISHED);
+ else if (strncasecmp(state, "RELATED", strlen) == 0)
+ sinfo->statemask |= XT_CONNTRACK_STATE_BIT(IP_CT_RELATED);
+ else if (strncasecmp(state, "UNTRACKED", strlen) == 0)
+ sinfo->statemask |= XT_CONNTRACK_STATE_UNTRACKED;
+ else if (strncasecmp(state, "SNAT", strlen) == 0)
+ sinfo->statemask |= XT_CONNTRACK_STATE_SNAT;
+ else if (strncasecmp(state, "DNAT", strlen) == 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 int
+parse_status(const char *status, size_t strlen, struct xt_conntrack_info *sinfo)
+{
+ if (strncasecmp(status, "NONE", strlen) == 0)
+ sinfo->statusmask |= 0;
+ else if (strncasecmp(status, "EXPECTED", strlen) == 0)
+ sinfo->statusmask |= IPS_EXPECTED;
+ else if (strncasecmp(status, "SEEN_REPLY", strlen) == 0)
+ sinfo->statusmask |= IPS_SEEN_REPLY;
+ else if (strncasecmp(status, "ASSURED", strlen) == 0)
+ sinfo->statusmask |= IPS_ASSURED;
+#ifdef IPS_CONFIRMED
+ else if (strncasecmp(status, "CONFIRMED", strlen) == 0)
+ sinfo->stausmask |= 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 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) : -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);
+}
+
+/* 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;
+
+ parse_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;
+
+ parse_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;
+
+ parse_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;
+
+ parse_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 void conntrack_mt_check(unsigned int flags)
+{
+ if (flags == 0)
+ exit_error(PARAMETER_PROBLEM, "You must specify one or more options");
+}
+
+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 = ",";
+ }
+#ifdef IPS_CONFIRMED
+ if (statusmask & IPS_CONFIRMED) {
+ printf("%sCONFIRMED", sep);
+ sep =",";
+ }
+#endif
+ if (statusmask == 0) {
+ printf("%sNONE", sep);
+ sep = ",";
+ }
+ printf(" ");
+}
+
+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", addr_to_dotted(addr));
+ else
+ sprintf(buf, "%s", addr_to_anyname(addr));
+ strcat(buf, mask_to_dotted(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);
+ }
+}
+
+/* Prints out the matchinfo. */
+static void conntrack_print(const void *ip, const struct xt_entry_match *match,
+ int numeric)
+{
+ matchinfo_print(ip, match, 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 struct xtables_match conntrack_match = {
+ .version = IPTABLES_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,
+};
+
+void _init(void)
+{
+ xtables_register_match(&conntrack_match);
+}