--- /dev/null
+/* 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/in6.h>*/
+#include <linux/netfilter_ipv6/ip6t_rt.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+
+/*#define DEBUG 1*/
+
+/* Function which prints out usage message. */
+static void rt_help(void)
+{
+ printf(
+"rt match 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 ADDR[,ADDR...] Type=0 addresses (list, max: %d)\n"
+" --rt-0-not-strict List of Type=0 addresses not a strict list\n",
+IP6T_RT_HOPS);
+}
+
+static const struct option rt_opts[] = {
+ { "rt-type", 1, NULL, '1' },
+ { "rt-segsleft", 1, NULL, '2' },
+ { "rt-len", 1, NULL, '3' },
+ { "rt-0-res", 0, NULL, '4' },
+ { "rt-0-addrs", 1, NULL, '5' },
+ { "rt-0-not-strict", 0, NULL, '6' },
+ { .name = NULL }
+};
+
+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);
+}
+
+static char *
+addr_to_numeric(const struct in6_addr *addrp)
+{
+ static char buf[50+1];
+ return (char *)inet_ntop(AF_INET6, addrp, buf, sizeof(buf));
+}
+
+static struct in6_addr *
+numeric_to_addr(const char *num)
+{
+ static struct in6_addr ap;
+ int err;
+
+ if ((err=inet_pton(AF_INET6, num, &ap)) == 1)
+ return ≈
+#ifdef DEBUG
+ fprintf(stderr, "\nnumeric2addr: %d\n", err);
+#endif
+ exit_error(PARAMETER_PROBLEM, "bad address: %s", num);
+
+ return (struct in6_addr *)NULL;
+}
+
+
+static int
+parse_addresses(const char *addrstr, struct in6_addr *addrp)
+{
+ char *buffer, *cp, *next;
+ unsigned int i;
+
+ buffer = strdup(addrstr);
+ if (!buffer) exit_error(OTHER_PROBLEM, "strdup failed");
+
+ for (cp=buffer, i=0; cp && i<IP6T_RT_HOPS; cp=next,i++)
+ {
+ next=strchr(cp, ',');
+ if (next) *next++='\0';
+ memcpy(&(addrp[i]), numeric_to_addr(cp), sizeof(struct in6_addr));
+#if DEBUG
+ printf("addr str: %s\n", cp);
+ printf("addr ip6: %s\n", addr_to_numeric((numeric_to_addr(cp))));
+ printf("addr [%d]: %s\n", i, addr_to_numeric(&(addrp[i])));
+#endif
+ }
+ if (cp) exit_error(PARAMETER_PROBLEM, "too many addresses specified");
+
+ free(buffer);
+
+#if DEBUG
+ printf("addr nr: %d\n", i);
+#endif
+
+ return i;
+}
+
+/* Initialize the match. */
+static void rt_init(struct xt_entry_match *m)
+{
+ 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;
+ rtinfo->addrnr = 0;
+}
+
+/* Function which parses command options; returns true if it
+ ate an option */
+static int rt_parse(int c, char **argv, int invert, unsigned int *flags,
+ const void *entry, struct xt_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-addrs'");
+ check_inverse(optarg, &invert, &optind, 0);
+ if (invert)
+ exit_error(PARAMETER_PROBLEM,
+ " '!' not allowed with `--rt-0-addrs'");
+ rtinfo->addrnr = parse_addresses(argv[optind-1], rtinfo->addrs);
+ rtinfo->flags |= IP6T_RT_FST;
+ *flags |= IP6T_RT_FST;
+ break;
+ case '6':
+ if (*flags & IP6T_RT_FST_NSTRICT)
+ exit_error(PARAMETER_PROBLEM,
+ "Only one `--rt-0-not-strict' allowed");
+ if ( !(*flags & IP6T_RT_FST) )
+ exit_error(PARAMETER_PROBLEM,
+ "`--rt-0-addr ...' required before `--rt-0-not-strict'");
+ rtinfo->flags |= IP6T_RT_FST_NSTRICT;
+ *flags |= IP6T_RT_FST_NSTRICT;
+ break;
+ default:
+ return 0;
+ }
+
+ return 1;
+}
+
+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(" ");
+ }
+}
+
+static void
+print_addresses(unsigned int addrnr, struct in6_addr *addrp)
+{
+ unsigned int i;
+
+ for(i=0; i<addrnr; i++){
+ printf("%s%c", addr_to_numeric(&(addrp[i])), (i!=addrnr-1)?',':' ');
+ }
+}
+
+/* Prints out the union ip6t_matchinfo. */
+static void rt_print(const void *ip, const struct xt_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("0-addrs ");
+ print_addresses(rtinfo->addrnr, (struct in6_addr *)rtinfo->addrs);
+ if (rtinfo->flags & IP6T_RT_FST_NSTRICT) printf("0-not-strict ");
+ 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 rt_save(const void *ip, const struct xt_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 ");
+ print_addresses(rtinfo->addrnr, (struct in6_addr *)rtinfo->addrs);
+ if (rtinfo->flags & IP6T_RT_FST_NSTRICT) printf("--rt-0-not-strict ");
+
+}
+
+static struct xtables_match rt_mt6_reg = {
+ .name = "rt",
+ .version = XTABLES_VERSION,
+ .family = PF_INET6,
+ .size = XT_ALIGN(sizeof(struct ip6t_rt)),
+ .userspacesize = XT_ALIGN(sizeof(struct ip6t_rt)),
+ .help = rt_help,
+ .init = rt_init,
+ .parse = rt_parse,
+ .print = rt_print,
+ .save = rt_save,
+ .extra_opts = rt_opts,
+};
+
+void
+_init(void)
+{
+ xtables_register_match(&rt_mt6_reg);
+}
git://git.onelab.eu / iptables.git / blobdiff