diff options
Diffstat (limited to 'extensions/libebt_802_3.c')
-rw-r--r-- | extensions/libebt_802_3.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/extensions/libebt_802_3.c b/extensions/libebt_802_3.c new file mode 100644 index 00000000..3c4a1c3c --- /dev/null +++ b/extensions/libebt_802_3.c @@ -0,0 +1,133 @@ +/* 802_3 + * + * Author: + * Chris Vitale <csv@bluetail.com> + * + * May 2003 + * + * Adapted by Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com> + * to use libxtables for ebtables-compat + */ + +#include <stdbool.h> +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <getopt.h> +#include <xtables.h> +#include <linux/netfilter_bridge/ebt_802_3.h> + +#define _802_3_SAP '1' +#define _802_3_TYPE '2' + +static const struct option br802_3_opts[] = { + { .name = "802_3-sap", .has_arg = true, .val = _802_3_SAP }, + { .name = "802_3-type", .has_arg = true, .val = _802_3_TYPE }, + XT_GETOPT_TABLEEND, +}; + +static void br802_3_print_help(void) +{ + 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 br802_3_init(struct xt_entry_match *match) +{ + struct ebt_802_3_info *info = (struct ebt_802_3_info *)match->data; + + info->invflags = 0; + info->bitmask = 0; +} + +static int +br802_3_parse(int c, char **argv, int invert, unsigned int *flags, + const void *entry, struct xt_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: + if (invert) + info->invflags |= EBT_802_3_SAP; + i = strtoul(optarg, &end, 16); + if (i > 255 || *end != '\0') + xtables_error(PARAMETER_PROBLEM, + "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: + if (invert) + info->invflags |= EBT_802_3_TYPE; + i = strtoul(optarg, &end, 16); + if (i > 65535 || *end != '\0') { + xtables_error(PARAMETER_PROBLEM, + "Problem with the specified " + "type hex value, %x",i); + } + info->type = htons(i); + info->bitmask |= EBT_802_3_TYPE; + break; + default: + return 0; + } + + *flags |= info->bitmask; + return 1; +} + +static void +br802_3_final_check(unsigned int flags) +{ + if (!flags) + xtables_error(PARAMETER_PROBLEM, + "You must specify proper arguments"); +} + +static void br802_3_print(const void *ip, const struct xt_entry_match *match, + int numeric) +{ + 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 struct xtables_match br802_3_match = +{ + .name = "802_3", + .revision = 0, + .version = XTABLES_VERSION, + .family = NFPROTO_BRIDGE, + .size = XT_ALIGN(sizeof(struct ebt_802_3_info)), + .userspacesize = XT_ALIGN(sizeof(struct ebt_802_3_info)), + .init = br802_3_init, + .help = br802_3_print_help, + .parse = br802_3_parse, + .final_check = br802_3_final_check, + .print = br802_3_print, + .extra_opts = br802_3_opts, +}; + +void _init(void) +{ + xtables_register_match(&br802_3_match); +} |