mirror of
https://github.com/openharmony/third_party_iptables.git
synced 2026-07-20 22:06:51 -04:00
new HBH and DSTopts match for IPv6 by kisza
This commit is contained in:
András Kis-Szabó
committed by
Harald Welte
Harald Welte
parent
fce8699bb8
commit
2ea56498b0
Executable
+2
@@ -0,0 +1,2 @@
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#!/bin/sh
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[ -f $KERNEL_DIR/net/ipv6/netfilter/ip6t_hbh.c -a -f $KERNEL_DIR/net/ipv6/netfilter/ip6t_dst.c -a -f $KERNEL_DIR/include/linux/netfilter_ipv6/ip6t_opts.h ] && echo hbh dst
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@@ -0,0 +1,285 @@
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/* Shared library add-on to ip6tables to add Hop-by-Hop and Dst headers support. */
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#include <stdio.h>
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#include <netdb.h>
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#include <string.h>
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#include <stdlib.h>
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#include <getopt.h>
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#include <errno.h>
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#include <ip6tables.h>
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/*#include <linux/in6.h>*/
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#include <linux/netfilter_ipv6/ip6t_opts.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#define DEBUG 0
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#define HOPBYHOP 0
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#define UNAME (HOPBYHOP ? "HBH" : "DST")
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#define LNAME (HOPBYHOP ? "hbh" : "dst")
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/* Function which prints out usage message. */
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static void
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help(void)
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{
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printf(
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"%s v%s options:\n"
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" --%s-len [!] length total length of this header\n"
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" --%s-opts TYPE[:LEN][,TYPE[:LEN]...] \n"
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" Options and its length (list, max: %d)\n",
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UNAME , NETFILTER_VERSION, LNAME, LNAME, IP6T_OPTS_OPTSNR);
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}
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#if HOPBYHOP
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static struct option opts[] = {
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{ "hbh-len", 1, 0, '1' },
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{ "hbh-opts", 1, 0, '2' },
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{ "hbh-not-strict", 1, 0, '3' },
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{0}
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};
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#else
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static struct option opts[] = {
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{ "dst-len", 1, 0, '1' },
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{ "dst-opts", 1, 0, '2' },
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{ "dst-not-strict", 1, 0, '3' },
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{0}
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};
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#endif
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static u_int32_t
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parse_opts_num(const char *idstr, const char *typestr)
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{
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unsigned long int id;
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char* ep;
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id = strtoul(idstr,&ep,0) ;
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if ( idstr == ep ) {
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exit_error(PARAMETER_PROBLEM,
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"%s no valid digits in %s `%s'", UNAME, typestr, idstr);
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}
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if ( id == ULONG_MAX && errno == ERANGE ) {
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exit_error(PARAMETER_PROBLEM,
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"%s `%s' specified too big: would overflow",
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typestr, idstr);
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}
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if ( *idstr != '\0' && *ep != '\0' ) {
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exit_error(PARAMETER_PROBLEM,
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"%s error parsing %s `%s'", UNAME, typestr, idstr);
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}
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return (u_int32_t) id;
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}
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static int
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parse_options(const char *optsstr, u_int16_t *opts)
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{
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char *buffer, *cp, *next, *range;
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unsigned int i;
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buffer = strdup(optsstr);
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if (!buffer) exit_error(OTHER_PROBLEM, "strdup failed");
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for (cp=buffer, i=0; cp && i<IP6T_OPTS_OPTSNR; cp=next,i++)
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{
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next=strchr(cp, ',');
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if (next) *next++='\0';
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range = strchr(cp, ':');
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if (range) {
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if (i == IP6T_OPTS_OPTSNR-1)
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exit_error(PARAMETER_PROBLEM,
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"too many ports specified");
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*range++ = '\0';
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}
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opts[i] = (u_int16_t)((parse_opts_num(cp,"opt") & 0x000000FF)<<8);
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if (range) {
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if (opts[i] == 0)
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exit_error(PARAMETER_PROBLEM, "PAD0 hasn't got length");
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opts[i] |= (u_int16_t)(parse_opts_num(range,"length") &
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0x000000FF);
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} else {
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opts[i] |= (0x00FF);
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}
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#if DEBUG
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printf("opts str: %s %s\n", cp, range);
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printf("opts opt: %04X\n", opts[i]);
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#endif
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}
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if (cp) exit_error(PARAMETER_PROBLEM, "too many addresses specified");
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free(buffer);
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#if DEBUG
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printf("addr nr: %d\n", i);
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#endif
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return i;
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}
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/* Initialize the match. */
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static void
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init(struct ip6t_entry_match *m, unsigned int *nfcache)
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{
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struct ip6t_opts *optinfo = (struct ip6t_opts *)m->data;
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optinfo->hdrlen = 0;
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optinfo->flags = 0;
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optinfo->invflags = 0;
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optinfo->optsnr = 0;
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}
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/* Function which parses command options; returns true if it
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ate an option */
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static int
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parse(int c, char **argv, int invert, unsigned int *flags,
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const struct ip6t_entry *entry,
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unsigned int *nfcache,
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struct ip6t_entry_match **match)
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{
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struct ip6t_opts *optinfo = (struct ip6t_opts *)(*match)->data;
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switch (c) {
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case '1':
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if (*flags & IP6T_OPTS_LEN)
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exit_error(PARAMETER_PROBLEM,
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"Only one `--%s-len' allowed", LNAME);
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check_inverse(optarg, &invert, &optind, 0);
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optinfo->hdrlen = parse_opts_num(argv[optind-1], "length");
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if (invert)
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optinfo->invflags |= IP6T_OPTS_INV_LEN;
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optinfo->flags |= IP6T_OPTS_LEN;
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*flags |= IP6T_OPTS_LEN;
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break;
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case '2':
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if (*flags & IP6T_OPTS_OPTS)
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exit_error(PARAMETER_PROBLEM,
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"Only one `--%s-opts' allowed", LNAME);
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check_inverse(optarg, &invert, &optind, 0);
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if (invert)
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exit_error(PARAMETER_PROBLEM,
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" '!' not allowed with `--%s-opts'", LNAME);
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optinfo->optsnr = parse_options(argv[optind-1], optinfo->opts);
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optinfo->flags |= IP6T_OPTS_OPTS;
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*flags |= IP6T_OPTS_OPTS;
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break;
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case '3':
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if (*flags & IP6T_OPTS_NSTRICT)
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exit_error(PARAMETER_PROBLEM,
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"Only one `--%s-not-strict' allowed", LNAME);
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if ( !(*flags & IP6T_OPTS_OPTS) )
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exit_error(PARAMETER_PROBLEM,
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"`--%s-opts ...' required before `--%s-not-strict'", LNAME, LNAME);
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optinfo->flags |= IP6T_OPTS_NSTRICT;
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*flags |= IP6T_OPTS_NSTRICT;
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break;
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default:
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return 0;
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}
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return 1;
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}
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/* Final check; we don't care. */
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static void
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final_check(unsigned int flags)
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{
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}
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static void
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print_nums(const char *name, u_int32_t min, u_int32_t max,
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int invert)
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{
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const char *inv = invert ? "!" : "";
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if (min != 0 || max != 0xFFFFFFFF || invert) {
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printf("%s", name);
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if (min == max) {
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printf(":%s", inv);
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printf("%u", min);
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} else {
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printf("s:%s", inv);
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printf("%u",min);
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printf(":");
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printf("%u",max);
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}
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printf(" ");
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}
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}
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static void
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print_options(int optsnr, u_int16_t *optsp)
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{
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unsigned int i;
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for(i=0; i<optsnr; i++){
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printf("%d", (optsp[i] & 0xFF00)>>8);
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if ((optsp[i] & 0x00FF) != 0x00FF){
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printf(":%d", (optsp[i] & 0x00FF));
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}
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printf("%c", (i!=optsnr-1)?',':' ');
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}
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}
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/* Prints out the union ip6t_matchinfo. */
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static void
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print(const struct ip6t_ip6 *ip,
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const struct ip6t_entry_match *match, int numeric)
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{
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const struct ip6t_opts *optinfo = (struct ip6t_opts *)match->data;
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printf("%s ", LNAME);
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if (optinfo->flags & IP6T_OPTS_LEN) {
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printf("length");
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printf(":%s", optinfo->invflags & IP6T_OPTS_INV_LEN ? "!" : "");
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printf("%u", optinfo->hdrlen);
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printf(" ");
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}
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if (optinfo->flags & IP6T_OPTS_OPTS) printf("opts ");
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print_options(optinfo->optsnr, optinfo->opts);
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if (optinfo->flags & IP6T_OPTS_NSTRICT) printf("not-strict ");
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if (optinfo->invflags & ~IP6T_OPTS_INV_MASK)
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printf("Unknown invflags: 0x%X ",
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optinfo->invflags & ~IP6T_OPTS_INV_MASK);
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}
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/* Saves the union ip6t_matchinfo in parsable form to stdout. */
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static void save(const struct ip6t_ip6 *ip, const struct ip6t_entry_match *match)
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{
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const struct ip6t_opts *optinfo = (struct ip6t_opts *)match->data;
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if (optinfo->flags & IP6T_OPTS_LEN) {
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printf("--%s-len %s%u ", LNAME,
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(optinfo->invflags & IP6T_OPTS_INV_LEN) ? "! " : "",
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optinfo->hdrlen);
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}
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if (optinfo->flags & IP6T_OPTS_OPTS) printf("--%s-opts ", LNAME);
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print_options(optinfo->optsnr, optinfo->opts);
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if (optinfo->flags & IP6T_OPTS_NSTRICT) printf("--%s-not-strict ", LNAME);
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}
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static
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struct ip6tables_match optstruct
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= { NULL,
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#if HOPBYHOP
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"hbh",
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#else
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"dst",
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#endif
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NETFILTER_VERSION,
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IP6T_ALIGN(sizeof(struct ip6t_opts)),
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IP6T_ALIGN(sizeof(struct ip6t_opts)),
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&help,
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&init,
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&parse,
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&final_check,
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&print,
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&save,
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opts
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};
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void
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_init(void)
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{
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register_match6(&optstruct);
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}
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@@ -0,0 +1,285 @@
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/* Shared library add-on to ip6tables to add Hop-by-Hop and Dst headers support. */
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#include <stdio.h>
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#include <netdb.h>
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#include <string.h>
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#include <stdlib.h>
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#include <getopt.h>
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#include <errno.h>
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#include <ip6tables.h>
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/*#include <linux/in6.h>*/
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#include <linux/netfilter_ipv6/ip6t_opts.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#define DEBUG 0
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#define HOPBYHOP 1
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#define UNAME (HOPBYHOP ? "HBH" : "DST")
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#define LNAME (HOPBYHOP ? "hbh" : "dst")
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/* Function which prints out usage message. */
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static void
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help(void)
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{
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printf(
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"%s v%s options:\n"
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" --%s-len [!] length total length of this header\n"
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" --%s-opts TYPE[:LEN][,TYPE[:LEN]...] \n"
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" Options and its length (list, max: %d)\n",
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UNAME , NETFILTER_VERSION, LNAME, LNAME, IP6T_OPTS_OPTSNR);
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}
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#if HOPBYHOP
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static struct option opts[] = {
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{ "hbh-len", 1, 0, '1' },
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{ "hbh-opts", 1, 0, '2' },
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{ "hbh-not-strict", 1, 0, '3' },
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{0}
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};
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#else
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static struct option opts[] = {
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{ "dst-len", 1, 0, '1' },
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{ "dst-opts", 1, 0, '2' },
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{ "dst-not-strict", 1, 0, '3' },
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{0}
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};
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#endif
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static u_int32_t
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parse_opts_num(const char *idstr, const char *typestr)
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{
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unsigned long int id;
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char* ep;
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id = strtoul(idstr,&ep,0) ;
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if ( idstr == ep ) {
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exit_error(PARAMETER_PROBLEM,
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"%s no valid digits in %s `%s'", UNAME, typestr, idstr);
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}
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if ( id == ULONG_MAX && errno == ERANGE ) {
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exit_error(PARAMETER_PROBLEM,
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"%s `%s' specified too big: would overflow",
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typestr, idstr);
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}
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if ( *idstr != '\0' && *ep != '\0' ) {
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exit_error(PARAMETER_PROBLEM,
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"%s error parsing %s `%s'", UNAME, typestr, idstr);
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}
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return (u_int32_t) id;
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}
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static int
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parse_options(const char *optsstr, u_int16_t *opts)
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{
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char *buffer, *cp, *next, *range;
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unsigned int i;
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buffer = strdup(optsstr);
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if (!buffer) exit_error(OTHER_PROBLEM, "strdup failed");
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for (cp=buffer, i=0; cp && i<IP6T_OPTS_OPTSNR; cp=next,i++)
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{
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next=strchr(cp, ',');
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if (next) *next++='\0';
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range = strchr(cp, ':');
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if (range) {
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if (i == IP6T_OPTS_OPTSNR-1)
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exit_error(PARAMETER_PROBLEM,
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"too many ports specified");
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*range++ = '\0';
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}
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opts[i] = (u_int16_t)((parse_opts_num(cp,"opt") & 0x000000FF)<<8);
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if (range) {
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if (opts[i] == 0)
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exit_error(PARAMETER_PROBLEM, "PAD0 hasn't got length");
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opts[i] |= (u_int16_t)(parse_opts_num(range,"length") &
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0x000000FF);
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} else {
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opts[i] |= (0x00FF);
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}
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#if DEBUG
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printf("opts str: %s %s\n", cp, range);
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printf("opts opt: %04X\n", opts[i]);
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#endif
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}
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if (cp) exit_error(PARAMETER_PROBLEM, "too many addresses specified");
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free(buffer);
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#if DEBUG
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printf("addr nr: %d\n", i);
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#endif
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return i;
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}
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/* Initialize the match. */
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static void
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init(struct ip6t_entry_match *m, unsigned int *nfcache)
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{
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struct ip6t_opts *optinfo = (struct ip6t_opts *)m->data;
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optinfo->hdrlen = 0;
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optinfo->flags = 0;
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optinfo->invflags = 0;
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optinfo->optsnr = 0;
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}
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/* Function which parses command options; returns true if it
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ate an option */
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static int
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parse(int c, char **argv, int invert, unsigned int *flags,
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const struct ip6t_entry *entry,
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unsigned int *nfcache,
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struct ip6t_entry_match **match)
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{
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struct ip6t_opts *optinfo = (struct ip6t_opts *)(*match)->data;
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switch (c) {
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case '1':
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if (*flags & IP6T_OPTS_LEN)
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exit_error(PARAMETER_PROBLEM,
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"Only one `--%s-len' allowed", LNAME);
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check_inverse(optarg, &invert, &optind, 0);
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optinfo->hdrlen = parse_opts_num(argv[optind-1], "length");
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if (invert)
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optinfo->invflags |= IP6T_OPTS_INV_LEN;
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optinfo->flags |= IP6T_OPTS_LEN;
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*flags |= IP6T_OPTS_LEN;
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break;
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case '2':
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if (*flags & IP6T_OPTS_OPTS)
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exit_error(PARAMETER_PROBLEM,
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"Only one `--%s-opts' allowed", LNAME);
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check_inverse(optarg, &invert, &optind, 0);
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if (invert)
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exit_error(PARAMETER_PROBLEM,
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" '!' not allowed with `--%s-opts'", LNAME);
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optinfo->optsnr = parse_options(argv[optind-1], optinfo->opts);
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optinfo->flags |= IP6T_OPTS_OPTS;
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*flags |= IP6T_OPTS_OPTS;
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break;
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case '3':
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if (*flags & IP6T_OPTS_NSTRICT)
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exit_error(PARAMETER_PROBLEM,
|
||||
"Only one `--%s-not-strict' allowed", LNAME);
|
||||
if ( !(*flags & IP6T_OPTS_OPTS) )
|
||||
exit_error(PARAMETER_PROBLEM,
|
||||
"`--%s-opts ...' required before `--%s-not-strict'", LNAME, LNAME);
|
||||
optinfo->flags |= IP6T_OPTS_NSTRICT;
|
||||
*flags |= IP6T_OPTS_NSTRICT;
|
||||
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(" ");
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
print_options(int optsnr, u_int16_t *optsp)
|
||||
{
|
||||
unsigned int i;
|
||||
|
||||
for(i=0; i<optsnr; i++){
|
||||
printf("%d", (optsp[i] & 0xFF00)>>8);
|
||||
if ((optsp[i] & 0x00FF) != 0x00FF){
|
||||
printf(":%d", (optsp[i] & 0x00FF));
|
||||
}
|
||||
printf("%c", (i!=optsnr-1)?',':' ');
|
||||
}
|
||||
}
|
||||
|
||||
/* 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_opts *optinfo = (struct ip6t_opts *)match->data;
|
||||
|
||||
printf("%s ", LNAME);
|
||||
if (optinfo->flags & IP6T_OPTS_LEN) {
|
||||
printf("length");
|
||||
printf(":%s", optinfo->invflags & IP6T_OPTS_INV_LEN ? "!" : "");
|
||||
printf("%u", optinfo->hdrlen);
|
||||
printf(" ");
|
||||
}
|
||||
if (optinfo->flags & IP6T_OPTS_OPTS) printf("opts ");
|
||||
print_options(optinfo->optsnr, optinfo->opts);
|
||||
if (optinfo->flags & IP6T_OPTS_NSTRICT) printf("not-strict ");
|
||||
if (optinfo->invflags & ~IP6T_OPTS_INV_MASK)
|
||||
printf("Unknown invflags: 0x%X ",
|
||||
optinfo->invflags & ~IP6T_OPTS_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_opts *optinfo = (struct ip6t_opts *)match->data;
|
||||
|
||||
if (optinfo->flags & IP6T_OPTS_LEN) {
|
||||
printf("--%s-len %s%u ", LNAME,
|
||||
(optinfo->invflags & IP6T_OPTS_INV_LEN) ? "! " : "",
|
||||
optinfo->hdrlen);
|
||||
}
|
||||
|
||||
if (optinfo->flags & IP6T_OPTS_OPTS) printf("--%s-opts ", LNAME);
|
||||
print_options(optinfo->optsnr, optinfo->opts);
|
||||
if (optinfo->flags & IP6T_OPTS_NSTRICT) printf("--%s-not-strict ", LNAME);
|
||||
|
||||
}
|
||||
|
||||
static
|
||||
struct ip6tables_match optstruct
|
||||
= { NULL,
|
||||
#if HOPBYHOP
|
||||
"hbh",
|
||||
#else
|
||||
"dst",
|
||||
#endif
|
||||
NETFILTER_VERSION,
|
||||
IP6T_ALIGN(sizeof(struct ip6t_opts)),
|
||||
IP6T_ALIGN(sizeof(struct ip6t_opts)),
|
||||
&help,
|
||||
&init,
|
||||
&parse,
|
||||
&final_check,
|
||||
&print,
|
||||
&save,
|
||||
opts
|
||||
};
|
||||
|
||||
void
|
||||
_init(void)
|
||||
{
|
||||
register_match6(&optstruct);
|
||||
}
|
||||
Reference in New Issue
Block a user