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author/C=JP/ST=JP/CN=Yasuyuki Kozakai/emailAddress=yasuyuki@netfilter.org </C=JP/ST=JP/CN=Yasuyuki Kozakai/emailAddress=yasuyuki@netfilter.org>2007-07-24 06:57:56 +0000
committer/C=JP/ST=JP/CN=Yasuyuki Kozakai/emailAddress=yasuyuki@netfilter.org </C=JP/ST=JP/CN=Yasuyuki Kozakai/emailAddress=yasuyuki@netfilter.org>2007-07-24 06:57:56 +0000
commit889c152a0885687b3229c1dcf498fc5b9a45c270 (patch)
tree4b2653ea4ab010d2fff7a85ac85c98af4151103c /extensions/libipt_tcpmss.c
parent916b1ce14cf080e5b28ec1dd2e2b0d700ff1ab15 (diff)
Add IPv6 support to tcpmss match
Diffstat (limited to 'extensions/libipt_tcpmss.c')
-rw-r--r--extensions/libipt_tcpmss.c152
1 files changed, 0 insertions, 152 deletions
diff --git a/extensions/libipt_tcpmss.c b/extensions/libipt_tcpmss.c
deleted file mode 100644
index e17c020..0000000
--- a/extensions/libipt_tcpmss.c
+++ /dev/null
@@ -1,152 +0,0 @@
-/* Shared library add-on to iptables to add tcp MSS matching support. */
-#include <stdio.h>
-#include <netdb.h>
-#include <string.h>
-#include <stdlib.h>
-#include <getopt.h>
-
-#include <iptables.h>
-#include <linux/netfilter_ipv4/ipt_tcpmss.h>
-
-/* Function which prints out usage message. */
-static void
-help(void)
-{
- printf(
-"tcpmss match v%s options:\n"
-"[!] --mss value[:value] Match TCP MSS range.\n"
-" (only valid for TCP SYN or SYN/ACK packets)\n",
-IPTABLES_VERSION);
-}
-
-static struct option opts[] = {
- { "mss", 1, 0, '1' },
- {0}
-};
-
-static u_int16_t
-parse_tcp_mssvalue(const char *mssvalue)
-{
- unsigned int mssvaluenum;
-
- if (string_to_number(mssvalue, 0, 65535, &mssvaluenum) != -1)
- return (u_int16_t)mssvaluenum;
-
- exit_error(PARAMETER_PROBLEM,
- "Invalid mss `%s' specified", mssvalue);
-}
-
-static void
-parse_tcp_mssvalues(const char *mssvaluestring,
- u_int16_t *mss_min, u_int16_t *mss_max)
-{
- char *buffer;
- char *cp;
-
- buffer = strdup(mssvaluestring);
- if ((cp = strchr(buffer, ':')) == NULL)
- *mss_min = *mss_max = parse_tcp_mssvalue(buffer);
- else {
- *cp = '\0';
- cp++;
-
- *mss_min = buffer[0] ? parse_tcp_mssvalue(buffer) : 0;
- *mss_max = cp[0] ? parse_tcp_mssvalue(cp) : 0xFFFF;
- }
- free(buffer);
-}
-
-/* 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 void *entry,
- unsigned int *nfcache,
- struct xt_entry_match **match)
-{
- struct ipt_tcpmss_match_info *mssinfo =
- (struct ipt_tcpmss_match_info *)(*match)->data;
-
- switch (c) {
- case '1':
- if (*flags)
- exit_error(PARAMETER_PROBLEM,
- "Only one `--mss' allowed");
- check_inverse(optarg, &invert, &optind, 0);
- parse_tcp_mssvalues(argv[optind-1],
- &mssinfo->mss_min, &mssinfo->mss_max);
- if (invert)
- mssinfo->invert = 1;
- *flags = 1;
- break;
- default:
- return 0;
- }
- return 1;
-}
-
-static void
-print_tcpmss(u_int16_t mss_min, u_int16_t mss_max, int invert, int numeric)
-{
- if (invert)
- printf("! ");
-
- if (mss_min == mss_max)
- printf("%u ", mss_min);
- else
- printf("%u:%u ", mss_min, mss_max);
-}
-
-/* Final check; must have specified --mss. */
-static void
-final_check(unsigned int flags)
-{
- if (!flags)
- exit_error(PARAMETER_PROBLEM,
- "tcpmss match: You must specify `--mss'");
-}
-
-/* Prints out the matchinfo. */
-static void
-print(const void *ip,
- const struct xt_entry_match *match,
- int numeric)
-{
- const struct ipt_tcpmss_match_info *mssinfo =
- (const struct ipt_tcpmss_match_info *)match->data;
-
- printf("tcpmss match ");
- print_tcpmss(mssinfo->mss_min, mssinfo->mss_max,
- mssinfo->invert, numeric);
-}
-
-/* Saves the union ipt_matchinfo in parsable form to stdout. */
-static void
-save(const void *ip, const struct xt_entry_match *match)
-{
- const struct ipt_tcpmss_match_info *mssinfo =
- (const struct ipt_tcpmss_match_info *)match->data;
-
- printf("--mss ");
- print_tcpmss(mssinfo->mss_min, mssinfo->mss_max,
- mssinfo->invert, 0);
-}
-
-static struct iptables_match tcpmss = {
- .next = NULL,
- .name = "tcpmss",
- .version = IPTABLES_VERSION,
- .size = IPT_ALIGN(sizeof(struct ipt_tcpmss_match_info)),
- .userspacesize = IPT_ALIGN(sizeof(struct ipt_tcpmss_match_info)),
- .help = &help,
- .parse = &parse,
- .final_check = &final_check,
- .print = &print,
- .save = &save,
- .extra_opts = opts
-};
-
-void _init(void)
-{
- register_match(&tcpmss);
-}