summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorBart De Schuymer <bdschuym@pandora.be>2003-05-12 17:00:26 +0000
committerBart De Schuymer <bdschuym@pandora.be>2003-05-12 17:00:26 +0000
commit42d2a7cc4aa9cdefed9c8ceac8f53499abb38aff (patch)
tree29934dd9aed15fd609d34e46e7b749e1f40160d1
parent09333f1419bbc4dab52e1fc7b347c49f21222455 (diff)
Chris Vitale <cvs_at_bluetail.com>
-rw-r--r--userspace/ebtables2/extensions/ebt_802_3.c145
1 files changed, 145 insertions, 0 deletions
diff --git a/userspace/ebtables2/extensions/ebt_802_3.c b/userspace/ebtables2/extensions/ebt_802_3.c
new file mode 100644
index 0000000..953a115
--- /dev/null
+++ b/userspace/ebtables2/extensions/ebt_802_3.c
@@ -0,0 +1,145 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include "../include/ebtables_u.h"
+#include "../include/ethernetdb.h"
+#include <linux/netfilter_bridge/ebt_802_3.h>
+
+#define _802_3_SAP '1'
+#define _802_3_TYPE '2'
+
+static struct option opts[] =
+{
+ { "802_3-sap" , required_argument, 0, _802_3_SAP },
+ { "802_3-type" , required_argument, 0, _802_3_TYPE },
+ { 0 }
+};
+
+static void print_help()
+{
+ printf(
+"802_3 options:\n"
+"--802_3-sap [!] protocol : 802.3 DSAP/SSAP- 1 byte value (hex)\n"
+" DSAP and SSAP are always the same. One SAP applies to both fields\n"
+"--802_3-type [!] protocol : 802.3 SNAP Type- 2 byte value (hex)\n"
+" Type implies SAP value 0xaa\n");
+}
+
+static void init(struct ebt_entry_match *match)
+{
+ struct ebt_802_3_info *info = (struct ebt_802_3_info *)match->data;
+
+ info->invflags = 0;
+ info->bitmask = 0;
+}
+
+static int parse(int c, char **argv, int argc, const struct ebt_u_entry *entry,
+ unsigned int *flags, struct ebt_entry_match **match)
+{
+ struct ebt_802_3_info *info = (struct ebt_802_3_info *) (*match)->data;
+ unsigned int i;
+ char *end;
+
+ switch (c) {
+ case _802_3_SAP:
+ check_option(flags, _802_3_SAP);
+ if (check_inverse(optarg))
+ info->invflags |= EBT_802_3_SAP;
+
+ if (optind > argc)
+ print_error("Missing 802.3-sap argument");
+ i = strtoul(argv[optind - 1], &end, 16);
+ if (i > 255 || *end != '\0')
+ print_error("Problem with specified "
+ "sap hex value, %x",i);
+ info->sap = i; /* one byte, so no byte order worries */
+ info->bitmask |= EBT_802_3_SAP;
+ break;
+ case _802_3_TYPE:
+ check_option(flags, _802_3_TYPE);
+ if (check_inverse(optarg))
+ info->invflags |= EBT_802_3_TYPE;
+ if (optind > argc)
+ print_error("Missing 802.3-type argument");
+ i = strtoul(argv[optind - 1], &end, 16);
+ if (i > 65535 || *end != '\0') {
+ print_error("Problem with the specified "
+ "type hex value, %x",i);
+ }
+ info->type = htons(i);
+ info->bitmask |= EBT_802_3_TYPE;
+ break;
+ default:
+ return 0;
+ }
+ return 1;
+}
+
+static void final_check(const struct ebt_u_entry *entry,
+ const struct ebt_entry_match *match, const char *name,
+ unsigned int hookmask, unsigned int time)
+{
+ if (!(entry->bitmask & EBT_802_3))
+ print_error("For 802.3 DSAP/SSAP filtering the protocol "
+ "must be LENGTH");
+}
+
+static void print(const struct ebt_u_entry *entry,
+ const struct ebt_entry_match *match)
+{
+ struct ebt_802_3_info *info = (struct ebt_802_3_info *)match->data;
+
+ if (info->bitmask & EBT_802_3_SAP) {
+ printf("--802_3-sap ");
+ if (info->invflags & EBT_802_3_SAP)
+ printf("! ");
+ printf("0x%.2x ", info->sap);
+ }
+ if (info->bitmask & EBT_802_3_TYPE) {
+ printf("--802_3-type ");
+ if (info->invflags & EBT_802_3_TYPE)
+ printf("! ");
+ printf("0x%.4x ", ntohs(info->type));
+ }
+}
+
+static int compare(const struct ebt_entry_match *m1,
+ const struct ebt_entry_match *m2)
+{
+ struct ebt_802_3_info *info1 = (struct ebt_802_3_info *)m1->data;
+ struct ebt_802_3_info *info2 = (struct ebt_802_3_info *)m2->data;
+
+ if (info1->bitmask != info2->bitmask)
+ return 0;
+ if (info1->invflags != info2->invflags)
+ return 0;
+ if (info1->bitmask & EBT_802_3_SAP) {
+ if (info1->sap != info2->sap)
+ return 0;
+ }
+ if (info1->bitmask & EBT_802_3_TYPE) {
+ if (info1->type != info2->type)
+ return 0;
+ }
+ return 1;
+}
+
+static struct ebt_u_match _802_3_match =
+{
+ EBT_802_3_MATCH,
+ sizeof(struct ebt_802_3_info),
+ print_help,
+ init,
+ parse,
+ final_check,
+ print,
+ compare,
+ opts
+};
+
+static void _init(void) __attribute__ ((constructor));
+static void _init(void)
+{
+ register_match(&_802_3_match);
+}