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authorAndrás Kis-Szabó <kisza@securityaudit.hu>2002-04-24 09:35:01 +0000
committerHarald Welte <laforge@gnumonks.org>2002-04-24 09:35:01 +0000
commita42041665a9d5d08d52a5f1a27916743fbb2736c (patch)
treea99e9d129f4e7955d64cee114d345c0daeafac55 /extensions
parentf6ed1d60cf9186333f2bca4fb581585c7263eedf (diff)
New 'route6' match by kisza.
Diffstat (limited to 'extensions')
-rw-r--r--extensions/libip6t_rt.c274
1 files changed, 274 insertions, 0 deletions
diff --git a/extensions/libip6t_rt.c b/extensions/libip6t_rt.c
new file mode 100644
index 00000000..4571d9fc
--- /dev/null
+++ b/extensions/libip6t_rt.c
@@ -0,0 +1,274 @@
+/* Shared library add-on to ip6tables to add Routing header support. */
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <errno.h>
+#include <ip6tables.h>
+#include <linux/netfilter_ipv6/ip6t_rt.h>
+
+/* Function which prints out usage message. */
+static void
+help(void)
+{
+ printf(
+"RT v%s options:\n"
+" --rt-type [!] type match the type\n"
+" --rt-segsleft [!] num[:num] match the Segments Left field (range)\n"
+" --rt-len [!] length total length of this header\n"
+" --rt-0-res check the reserved filed, too (type 0)\n"
+" --rt-0-addrs Type=0 addresses (list) - NOT SUPPORTED, yet\n",
+NETFILTER_VERSION);
+}
+
+static struct option opts[] = {
+ { "rt-type", 1, 0, '1' },
+ { "rt-segsleft", 1, 0, '2' },
+ { "rt-len", 1, 0, '3' },
+ { "rt-0-res", 0, 0, '4' },
+ { "rt-0-addrs", 0, 0, '5' },
+ {0}
+};
+
+static u_int32_t
+parse_rt_num(const char *idstr, const char *typestr)
+{
+ unsigned long int id;
+ char* ep;
+
+ id = strtoul(idstr,&ep,0) ;
+
+ if ( idstr == ep ) {
+ exit_error(PARAMETER_PROBLEM,
+ "RT no valid digits in %s `%s'", typestr, idstr);
+ }
+ if ( id == ULONG_MAX && errno == ERANGE ) {
+ exit_error(PARAMETER_PROBLEM,
+ "%s `%s' specified too big: would overflow",
+ typestr, idstr);
+ }
+ if ( *idstr != '\0' && *ep != '\0' ) {
+ exit_error(PARAMETER_PROBLEM,
+ "RT error parsing %s `%s'", typestr, idstr);
+ }
+ return (u_int32_t) id;
+}
+
+static void
+parse_rt_segsleft(const char *idstring, u_int32_t *ids)
+{
+ char *buffer;
+ char *cp;
+
+ buffer = strdup(idstring);
+ if ((cp = strchr(buffer, ':')) == NULL)
+ ids[0] = ids[1] = parse_rt_num(buffer,"segsleft");
+ else {
+ *cp = '\0';
+ cp++;
+
+ ids[0] = buffer[0] ? parse_rt_num(buffer,"segsleft") : 0;
+ ids[1] = cp[0] ? parse_rt_num(cp,"segsleft") : 0xFFFFFFFF;
+ }
+ free(buffer);
+}
+
+/* Initialize the match. */
+static void
+init(struct ip6t_entry_match *m, unsigned int *nfcache)
+{
+ struct ip6t_rt *rtinfo = (struct ip6t_rt *)m->data;
+
+ rtinfo->rt_type = 0x0L;
+ rtinfo->segsleft[0] = 0x0L;
+ rtinfo->segsleft[1] = 0xFFFFFFFF;
+ rtinfo->hdrlen = 0;
+ rtinfo->flags = 0;
+ rtinfo->invflags = 0;
+}
+
+/* Function which parses command options; returns true if it
+ ate an option */
+static int
+parse(int c, char **argv, int invert, unsigned int *flags,
+ const struct ip6t_entry *entry,
+ unsigned int *nfcache,
+ struct ip6t_entry_match **match)
+{
+ struct ip6t_rt *rtinfo = (struct ip6t_rt *)(*match)->data;
+
+ switch (c) {
+ case '1':
+ if (*flags & IP6T_RT_TYP)
+ exit_error(PARAMETER_PROBLEM,
+ "Only one `--rt-type' allowed");
+ check_inverse(optarg, &invert, &optind, 0);
+ rtinfo->rt_type = parse_rt_num(argv[optind-1], "type");
+ if (invert)
+ rtinfo->invflags |= IP6T_RT_INV_TYP;
+ rtinfo->flags |= IP6T_RT_TYP;
+ *flags |= IP6T_RT_TYP;
+ break;
+ case '2':
+ if (*flags & IP6T_RT_SGS)
+ exit_error(PARAMETER_PROBLEM,
+ "Only one `--rt-segsleft' allowed");
+ check_inverse(optarg, &invert, &optind, 0);
+ parse_rt_segsleft(argv[optind-1], rtinfo->segsleft);
+ if (invert)
+ rtinfo->invflags |= IP6T_RT_INV_SGS;
+ rtinfo->flags |= IP6T_RT_SGS;
+ *flags |= IP6T_RT_SGS;
+ break;
+ case '3':
+ if (*flags & IP6T_RT_LEN)
+ exit_error(PARAMETER_PROBLEM,
+ "Only one `--rt-len' allowed");
+ check_inverse(optarg, &invert, &optind, 0);
+ rtinfo->hdrlen = parse_rt_num(argv[optind-1], "length");
+ if (invert)
+ rtinfo->invflags |= IP6T_RT_INV_LEN;
+ rtinfo->flags |= IP6T_RT_LEN;
+ *flags |= IP6T_RT_LEN;
+ break;
+ case '4':
+ if (*flags & IP6T_RT_RES)
+ exit_error(PARAMETER_PROBLEM,
+ "Only one `--rt-0-res' allowed");
+ if ( !(*flags & IP6T_RT_TYP) || (rtinfo->rt_type != 0) || (rtinfo->invflags & IP6T_RT_INV_TYP) )
+ exit_error(PARAMETER_PROBLEM,
+ "`--rt-type 0' required before `--rt-0-res'");
+ rtinfo->flags |= IP6T_RT_RES;
+ *flags |= IP6T_RT_RES;
+ break;
+ case '5':
+ if (*flags & IP6T_RT_FST)
+ exit_error(PARAMETER_PROBLEM,
+ "Only one `--rt-0-addrs' allowed");
+ if ( !(*flags & IP6T_RT_TYP) || (rtinfo->rt_type != 0) || (rtinfo->invflags & IP6T_RT_INV_TYP) )
+ exit_error(PARAMETER_PROBLEM,
+ "`--rt-type 0' required before `--rt-0-res'");
+ /* TODO: implement it! */
+ exit_error(PARAMETER_PROBLEM,
+ " `--rt-0-addrs' not supported, yet");
+ rtinfo->flags |= IP6T_RT_FST;
+ *flags |= IP6T_RT_FST;
+ break;
+ default:
+ return 0;
+ }
+
+ return 1;
+}
+
+/* Final check; we don't care. */
+static void
+final_check(unsigned int flags)
+{
+}
+
+static void
+print_nums(const char *name, u_int32_t min, u_int32_t max,
+ int invert)
+{
+ const char *inv = invert ? "!" : "";
+
+ if (min != 0 || max != 0xFFFFFFFF || invert) {
+ printf("%s", name);
+ if (min == max) {
+ printf(":%s", inv);
+ printf("%u", min);
+ } else {
+ printf("s:%s", inv);
+ printf("%u",min);
+ printf(":");
+ printf("%u",max);
+ }
+ printf(" ");
+ }
+}
+
+/* Prints out the union ip6t_matchinfo. */
+static void
+print(const struct ip6t_ip6 *ip,
+ const struct ip6t_entry_match *match, int numeric)
+{
+ const struct ip6t_rt *rtinfo = (struct ip6t_rt *)match->data;
+
+ printf("rt ");
+ if (rtinfo->flags & IP6T_RT_TYP)
+ printf("type:%s%d ", rtinfo->invflags & IP6T_RT_INV_TYP ? "!" : "",
+ rtinfo->rt_type);
+ print_nums("segsleft", rtinfo->segsleft[0], rtinfo->segsleft[1],
+ rtinfo->invflags & IP6T_RT_INV_SGS);
+ if (rtinfo->flags & IP6T_RT_LEN) {
+ printf("length");
+ printf(":%s", rtinfo->invflags & IP6T_RT_INV_LEN ? "!" : "");
+ printf("%u", rtinfo->hdrlen);
+ printf(" ");
+ }
+ if (rtinfo->flags & IP6T_RT_RES) printf("reserved ");
+ if (rtinfo->flags & IP6T_RT_FST) printf("type0-addrs ");
+ if (rtinfo->invflags & ~IP6T_RT_INV_MASK)
+ printf("Unknown invflags: 0x%X ",
+ rtinfo->invflags & ~IP6T_RT_INV_MASK);
+}
+
+/* Saves the union ip6t_matchinfo in parsable form to stdout. */
+static void save(const struct ip6t_ip6 *ip, const struct ip6t_entry_match *match)
+{
+ const struct ip6t_rt *rtinfo = (struct ip6t_rt *)match->data;
+
+ if (rtinfo->flags & IP6T_RT_TYP) {
+ printf("--rt-type %s%u ",
+ (rtinfo->invflags & IP6T_RT_INV_TYP) ? "! " : "",
+ rtinfo->rt_type);
+ }
+
+ if (!(rtinfo->segsleft[0] == 0
+ && rtinfo->segsleft[1] == 0xFFFFFFFF)) {
+ printf("--rt-segsleft %s",
+ (rtinfo->invflags & IP6T_RT_INV_SGS) ? "! " : "");
+ if (rtinfo->segsleft[0]
+ != rtinfo->segsleft[1])
+ printf("%u:%u ",
+ rtinfo->segsleft[0],
+ rtinfo->segsleft[1]);
+ else
+ printf("%u ",
+ rtinfo->segsleft[0]);
+ }
+
+ if (rtinfo->flags & IP6T_RT_LEN) {
+ printf("--rt-len %s%u ",
+ (rtinfo->invflags & IP6T_RT_INV_LEN) ? "! " : "",
+ rtinfo->hdrlen);
+ }
+
+ if (rtinfo->flags & IP6T_RT_RES) printf("--rt-0-res ");
+ if (rtinfo->flags & IP6T_RT_FST) printf("--rt-0-addrs ");
+
+}
+
+static
+struct ip6tables_match rt
+= { NULL,
+ "rt",
+ NETFILTER_VERSION,
+ IP6T_ALIGN(sizeof(struct ip6t_rt)),
+ IP6T_ALIGN(sizeof(struct ip6t_rt)),
+ &help,
+ &init,
+ &parse,
+ &final_check,
+ &print,
+ &save,
+ opts
+};
+
+void
+_init(void)
+{
+ register_match6(&rt);
+}