IPv6 'port' of ROUTE target (Cedric de Launois)

diff --git a/extensions/.ROUTE-test6 b/extensions/.ROUTE-test6
new file mode 100755 (executable)
index 0000000..7994970
--- /dev/null
+++ b/extensions/.ROUTE-test6
@@ -0,0 +1,2 @@
+#! /bin/sh
+[ -f $KERNEL_DIR/include/linux/netfilter_ipv6/ip6t_ROUTE.h ] && echo ROUTE

diff --git a/extensions/libip6t_ROUTE.c b/extensions/libip6t_ROUTE.c
new file mode 100644 (file)
index 0000000..71dada8
--- /dev/null
+++ b/extensions/libip6t_ROUTE.c
@@ -0,0 +1,209 @@
+/* Shared library add-on to iptables to add ROUTE v6 target support.
+ * Author : Cedric de Launois, <delaunois@info.ucl.ac.be>
+ * v 1.0 2003/06/24
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+
+#include <ip6tables.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter_ipv6/ip6t_ROUTE.h>
+
+/* Function which prints out usage message. */
+static void
+help(void)
+{
+       printf(
+"ROUTE target v%s options:\n"
+"    --oif   \tifname \t\tRoute the packet through `ifname' network interface\n"
+"    --gw    \tip     \t\tRoute the packet via this gateway\n"
+"    --continue\t     \t\tRoute the packet and continue traversing the rules.\n"
+"\n",
+"1.0");
+}
+
+static struct option opts[] = {
+       { "oif", 1, 0, '1' },
+       { "iif", 1, 0, '2' },
+       { "gw", 1, 0, '3' },
+       { "continue", 0, 0, '4' },
+       { 0 }
+};
+
+/* Initialize the target. */
+static void
+init(struct ip6t_entry_target *t, unsigned int *nfcache)
+{
+       struct ip6t_route_target_info *route_info = 
+               (struct ip6t_route_target_info*)t->data;
+
+       route_info->oif[0] = '\0';
+       route_info->iif[0] = '\0';
+       route_info->gw[0] = 0;
+       route_info->gw[1] = 0;
+       route_info->gw[2] = 0;
+       route_info->gw[3] = 0;
+       route_info->flags = 0;
+}
+
+
+#define IP6T_ROUTE_OPT_OIF      0x01
+#define IP6T_ROUTE_OPT_IIF      0x02
+#define IP6T_ROUTE_OPT_GW       0x04
+#define IP6T_ROUTE_OPT_CONTINUE 0x08
+
+/* 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,
+      struct ip6t_entry_target **target)
+{
+       struct ip6t_route_target_info *route_info = 
+               (struct ip6t_route_target_info*)(*target)->data;
+
+       switch (c) {
+       case '1':
+               if (*flags & IP6T_ROUTE_OPT_OIF)
+                       exit_error(PARAMETER_PROBLEM,
+                                  "Can't specify --oif twice");
+
+               if (check_inverse(optarg, &invert, NULL, 0))
+                       exit_error(PARAMETER_PROBLEM,
+                                  "Unexpected `!' after --oif");
+
+               if (strlen(optarg) > sizeof(route_info->oif) - 1)
+                       exit_error(PARAMETER_PROBLEM,
+                                  "Maximum interface name length %u",
+                                  sizeof(route_info->oif) - 1);
+
+               strcpy(route_info->oif, optarg);
+               *flags |= IP6T_ROUTE_OPT_OIF;
+               break;
+
+       case '2':
+               exit_error(PARAMETER_PROBLEM,
+                          "--iif option not implemented");
+               break;
+
+       case '3':
+               if (*flags & IP6T_ROUTE_OPT_GW)
+                       exit_error(PARAMETER_PROBLEM,
+                                  "Can't specify --gw twice");
+
+               if (check_inverse(optarg, &invert, NULL, 0))
+                       exit_error(PARAMETER_PROBLEM,
+                                  "Unexpected `!' after --gw");
+
+               if (!inet_pton(AF_INET6, optarg, (struct in6_addr*)&route_info->gw)) {
+                       exit_error(PARAMETER_PROBLEM,
+                                  "Invalid IPv6 address %s",
+                                  optarg);
+               }
+
+               *flags |= IP6T_ROUTE_OPT_GW;
+               break;
+
+       case '4':
+               if (*flags & IP6T_ROUTE_OPT_CONTINUE)
+                       exit_error(PARAMETER_PROBLEM,
+                                  "Can't specify --continue twice");
+
+               route_info->flags |= IP6T_ROUTE_CONTINUE;
+               *flags |= IP6T_ROUTE_OPT_CONTINUE;
+
+               break;
+
+       default:
+               return 0;
+       }
+
+       return 1;
+}
+
+
+static void
+final_check(unsigned int flags)
+{
+       if (!flags)
+               exit_error(PARAMETER_PROBLEM,
+                          "ROUTE target: oif or gw option required");
+}
+
+
+/* Prints out the targinfo. */
+static void
+print(const struct ip6t_ip6 *ip,
+      const struct ip6t_entry_target *target,
+      int numeric)
+{
+       const struct ip6t_route_target_info *route_info
+               = (const struct ip6t_route_target_info *)target->data;
+
+       printf("ROUTE ");
+
+       if (route_info->oif[0])
+               printf("oif:%s ", route_info->oif);
+
+       if (route_info->gw[0] 
+           || route_info->gw[1] 
+           || route_info->gw[2] 
+           || route_info->gw[3]) {
+               char address[INET6_ADDRSTRLEN];
+               printf("gw:%s ", inet_ntop(AF_INET6, route_info->gw, address, INET6_ADDRSTRLEN));
+       }
+
+       if (route_info->flags & IP6T_ROUTE_CONTINUE)
+               printf("continue");
+
+}
+
+
+static void save(const struct ip6t_ip6 *ip, 
+                const struct ip6t_entry_target *target)
+{
+       const struct ip6t_route_target_info *route_info
+               = (const struct ip6t_route_target_info *)target->data;
+
+       if (route_info->oif[0])
+               printf("--oif %s ", route_info->oif);
+
+       if (route_info->gw[0] 
+           || route_info->gw[1] 
+           || route_info->gw[2] 
+           || route_info->gw[3]) {
+               char address[INET6_ADDRSTRLEN];
+               printf("--gw %s ", inet_ntop(AF_INET6, route_info->gw, address, INET6_ADDRSTRLEN));
+       }
+
+       if (route_info->flags & IP6T_ROUTE_CONTINUE)
+               printf("--continue ");
+}
+
+
+static
+struct ip6tables_target route
+= { NULL,
+    "ROUTE",
+    IPTABLES_VERSION,
+    IP6T_ALIGN(sizeof(struct ip6t_route_target_info)),
+    IP6T_ALIGN(sizeof(struct ip6t_route_target_info)),
+    &help,
+    &init,
+    &parse,
+    &final_check,
+    &print,
+    &save,
+    opts
+};
+
+void _init(void)
+{
+       register_target6(&route);
+}