+++ /dev/null
-/* Shared library add-on to ip6tables to add Fragmentation 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/netfilter_ipv6/ip6t_frag.h>
-
-/* Function which prints out usage message. */
-static void frag_help(void)
-{
- printf(
-"frag match options:\n"
-" --fragid [!] id[:id] match the id (range)\n"
-" --fraglen [!] length total length of this header\n"
-" --fragres check the reserved filed, too\n"
-" --fragfirst matches on the first fragment\n"
-" [--fragmore|--fraglast] there are more fragments or this\n"
-" is the last one\n");
-}
-
-static const struct option frag_opts[] = {
- { .name = "fragid", .has_arg = 1, .val = '1' },
- { .name = "fraglen", .has_arg = 1, .val = '2' },
- { .name = "fragres", .has_arg = 0, .val = '3' },
- { .name = "fragfirst", .has_arg = 0, .val = '4' },
- { .name = "fragmore", .has_arg = 0, .val = '5' },
- { .name = "fraglast", .has_arg = 0, .val = '6' },
- { .name = NULL }
-};
-
-static u_int32_t
-parse_frag_id(const char *idstr, const char *typestr)
-{
- unsigned long int id;
- char* ep;
-
- id = strtoul(idstr, &ep, 0);
-
- if ( idstr == ep ) {
- exit_error(PARAMETER_PROBLEM,
- "FRAG 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,
- "FRAG error parsing %s `%s'", typestr, idstr);
- }
- return (u_int32_t) id;
-}
-
-static void
-parse_frag_ids(const char *idstring, u_int32_t *ids)
-{
- char *buffer;
- char *cp;
-
- buffer = strdup(idstring);
- if ((cp = strchr(buffer, ':')) == NULL)
- ids[0] = ids[1] = parse_frag_id(buffer,"id");
- else {
- *cp = '\0';
- cp++;
-
- ids[0] = buffer[0] ? parse_frag_id(buffer,"id") : 0;
- ids[1] = cp[0] ? parse_frag_id(cp,"id") : 0xFFFFFFFF;
- }
- free(buffer);
-}
-
-/* Initialize the match. */
-static void frag_init(struct xt_entry_match *m)
-{
- struct ip6t_frag *fraginfo = (struct ip6t_frag *)m->data;
-
- fraginfo->ids[0] = 0x0L;
- fraginfo->ids[1] = 0xFFFFFFFF;
- fraginfo->hdrlen = 0;
- fraginfo->flags = 0;
- fraginfo->invflags = 0;
-}
-
-/* Function which parses command options; returns true if it
- ate an option */
-static int frag_parse(int c, char **argv, int invert, unsigned int *flags,
- const void *entry, struct xt_entry_match **match)
-{
- struct ip6t_frag *fraginfo = (struct ip6t_frag *)(*match)->data;
-
- switch (c) {
- case '1':
- if (*flags & IP6T_FRAG_IDS)
- exit_error(PARAMETER_PROBLEM,
- "Only one `--fragid' allowed");
- check_inverse(optarg, &invert, &optind, 0);
- parse_frag_ids(argv[optind-1], fraginfo->ids);
- if (invert)
- fraginfo->invflags |= IP6T_FRAG_INV_IDS;
- fraginfo->flags |= IP6T_FRAG_IDS;
- *flags |= IP6T_FRAG_IDS;
- break;
- case '2':
- if (*flags & IP6T_FRAG_LEN)
- exit_error(PARAMETER_PROBLEM,
- "Only one `--fraglen' allowed");
- check_inverse(optarg, &invert, &optind, 0);
- fraginfo->hdrlen = parse_frag_id(argv[optind-1], "length");
- if (invert)
- fraginfo->invflags |= IP6T_FRAG_INV_LEN;
- fraginfo->flags |= IP6T_FRAG_LEN;
- *flags |= IP6T_FRAG_LEN;
- break;
- case '3':
- if (*flags & IP6T_FRAG_RES)
- exit_error(PARAMETER_PROBLEM,
- "Only one `--fragres' allowed");
- fraginfo->flags |= IP6T_FRAG_RES;
- *flags |= IP6T_FRAG_RES;
- break;
- case '4':
- if (*flags & IP6T_FRAG_FST)
- exit_error(PARAMETER_PROBLEM,
- "Only one `--fragfirst' allowed");
- fraginfo->flags |= IP6T_FRAG_FST;
- *flags |= IP6T_FRAG_FST;
- break;
- case '5':
- if (*flags & (IP6T_FRAG_MF|IP6T_FRAG_NMF))
- exit_error(PARAMETER_PROBLEM,
- "Only one `--fragmore' or `--fraglast' allowed");
- fraginfo->flags |= IP6T_FRAG_MF;
- *flags |= IP6T_FRAG_MF;
- break;
- case '6':
- if (*flags & (IP6T_FRAG_MF|IP6T_FRAG_NMF))
- exit_error(PARAMETER_PROBLEM,
- "Only one `--fragmore' or `--fraglast' allowed");
- fraginfo->flags |= IP6T_FRAG_NMF;
- *flags |= IP6T_FRAG_NMF;
- break;
- default:
- return 0;
- }
-
- return 1;
-}
-
-static void
-print_ids(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%u ", inv, min);
- else
- printf("s:%s%u:%u ", inv, min, max);
- }
-}
-
-/* Prints out the union ip6t_matchinfo. */
-static void frag_print(const void *ip, const struct xt_entry_match *match,
- int numeric)
-{
- const struct ip6t_frag *frag = (struct ip6t_frag *)match->data;
-
- printf("frag ");
- print_ids("id", frag->ids[0], frag->ids[1],
- frag->invflags & IP6T_FRAG_INV_IDS);
-
- if (frag->flags & IP6T_FRAG_LEN) {
- printf("length:%s%u ",
- frag->invflags & IP6T_FRAG_INV_LEN ? "!" : "",
- frag->hdrlen);
- }
-
- if (frag->flags & IP6T_FRAG_RES)
- printf("reserved ");
-
- if (frag->flags & IP6T_FRAG_FST)
- printf("first ");
-
- if (frag->flags & IP6T_FRAG_MF)
- printf("more ");
-
- if (frag->flags & IP6T_FRAG_NMF)
- printf("last ");
-
- if (frag->invflags & ~IP6T_FRAG_INV_MASK)
- printf("Unknown invflags: 0x%X ",
- frag->invflags & ~IP6T_FRAG_INV_MASK);
-}
-
-/* Saves the union ip6t_matchinfo in parsable form to stdout. */
-static void frag_save(const void *ip, const struct xt_entry_match *match)
-{
- const struct ip6t_frag *fraginfo = (struct ip6t_frag *)match->data;
-
- if (!(fraginfo->ids[0] == 0
- && fraginfo->ids[1] == 0xFFFFFFFF)) {
- printf("--fragid %s",
- (fraginfo->invflags & IP6T_FRAG_INV_IDS) ? "! " : "");
- if (fraginfo->ids[0]
- != fraginfo->ids[1])
- printf("%u:%u ",
- fraginfo->ids[0],
- fraginfo->ids[1]);
- else
- printf("%u ",
- fraginfo->ids[0]);
- }
-
- if (fraginfo->flags & IP6T_FRAG_LEN) {
- printf("--fraglen %s%u ",
- (fraginfo->invflags & IP6T_FRAG_INV_LEN) ? "! " : "",
- fraginfo->hdrlen);
- }
-
- if (fraginfo->flags & IP6T_FRAG_RES)
- printf("--fragres ");
-
- if (fraginfo->flags & IP6T_FRAG_FST)
- printf("--fragfirst ");
-
- if (fraginfo->flags & IP6T_FRAG_MF)
- printf("--fragmore ");
-
- if (fraginfo->flags & IP6T_FRAG_NMF)
- printf("--fraglast ");
-}
-
-static struct xtables_match frag_mt6_reg = {
- .name = "frag",
- .version = XTABLES_VERSION,
- .family = PF_INET6,
- .size = XT_ALIGN(sizeof(struct ip6t_frag)),
- .userspacesize = XT_ALIGN(sizeof(struct ip6t_frag)),
- .help = frag_help,
- .init = frag_init,
- .parse = frag_parse,
- .print = frag_print,
- .save = frag_save,
- .extra_opts = frag_opts,
-};
-
-void
-_init(void)
-{
- xtables_register_match(&frag_mt6_reg);
-}
git://git.onelab.eu / iptables.git / blobdiff