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/*
* Copyright (c) 2010-2013 Patrick McHardy <kaber@trash.net>
*/
#include <stdio.h>
#include <string.h>
#include <xtables.h>
#include <linux/netfilter/nf_conntrack_common.h>
#include <linux/netfilter/xt_CT.h>
static void ct_help(void)
{
printf(
"CT target options:\n"
" --notrack Don't track connection\n"
" --helper name Use conntrack helper 'name' for connection\n"
" --ctevents event[,event...] Generate specified conntrack events for connection\n"
" --expevents event[,event...] Generate specified expectation events for connection\n"
" --zone {ID|mark} Assign/Lookup connection in zone ID/packet nfmark\n"
" --zone-orig {ID|mark} Same as 'zone' option, but only applies to ORIGINAL direction\n"
" --zone-reply {ID|mark} Same as 'zone' option, but only applies to REPLY direction\n"
);
}
static void ct_help_v1(void)
{
printf(
"CT target options:\n"
" --notrack Don't track connection\n"
" --helper name Use conntrack helper 'name' for connection\n"
" --timeout name Use timeout policy 'name' for connection\n"
" --ctevents event[,event...] Generate specified conntrack events for connection\n"
" --expevents event[,event...] Generate specified expectation events for connection\n"
" --zone {ID|mark} Assign/Lookup connection in zone ID/packet nfmark\n"
" --zone-orig {ID|mark} Same as 'zone' option, but only applies to ORIGINAL direction\n"
" --zone-reply {ID|mark} Same as 'zone' option, but only applies to REPLY direction\n"
);
}
enum {
O_NOTRACK = 0,
O_HELPER,
O_TIMEOUT,
O_CTEVENTS,
O_EXPEVENTS,
O_ZONE,
O_ZONE_ORIG,
O_ZONE_REPLY,
};
#define s struct xt_ct_target_info
static const struct xt_option_entry ct_opts[] = {
{.name = "notrack", .id = O_NOTRACK, .type = XTTYPE_NONE},
{.name = "helper", .id = O_HELPER, .type = XTTYPE_STRING,
.flags = XTOPT_PUT, XTOPT_POINTER(s, helper)},
{.name = "ctevents", .id = O_CTEVENTS, .type = XTTYPE_STRING},
{.name = "expevents", .id = O_EXPEVENTS, .type = XTTYPE_STRING},
{.name = "zone-orig", .id = O_ZONE_ORIG, .type = XTTYPE_STRING},
{.name = "zone-reply", .id = O_ZONE_REPLY, .type = XTTYPE_STRING},
{.name = "zone", .id = O_ZONE, .type = XTTYPE_STRING},
XTOPT_TABLEEND,
};
#undef s
#define s struct xt_ct_target_info_v1
static const struct xt_option_entry ct_opts_v1[] = {
{.name = "notrack", .id = O_NOTRACK, .type = XTTYPE_NONE},
{.name = "helper", .id = O_HELPER, .type = XTTYPE_STRING,
.flags = XTOPT_PUT, XTOPT_POINTER(s, helper)},
{.name = "timeout", .id = O_TIMEOUT, .type = XTTYPE_STRING,
.flags = XTOPT_PUT, XTOPT_POINTER(s, timeout)},
{.name = "ctevents", .id = O_CTEVENTS, .type = XTTYPE_STRING},
{.name = "expevents", .id = O_EXPEVENTS, .type = XTTYPE_STRING},
{.name = "zone-orig", .id = O_ZONE_ORIG, .type = XTTYPE_STRING},
{.name = "zone-reply", .id = O_ZONE_REPLY, .type = XTTYPE_STRING},
{.name = "zone", .id = O_ZONE, .type = XTTYPE_STRING},
XTOPT_TABLEEND,
};
#undef s
struct event_tbl {
const char *name;
unsigned int event;
};
static const struct event_tbl ct_event_tbl[] = {
{ "new", IPCT_NEW },
{ "related", IPCT_RELATED },
{ "destroy", IPCT_DESTROY },
{ "reply", IPCT_REPLY },
{ "assured", IPCT_ASSURED },
{ "protoinfo", IPCT_PROTOINFO },
{ "helper", IPCT_HELPER },
{ "mark", IPCT_MARK },
{ "natseqinfo", IPCT_NATSEQADJ },
{ "secmark", IPCT_SECMARK },
};
static const struct event_tbl exp_event_tbl[] = {
{ "new", IPEXP_NEW },
};
static void ct_parse_zone_id(const char *opt, unsigned int opt_id,
uint16_t *zone_id, uint16_t *flags)
{
if (opt_id == O_ZONE_ORIG)
*flags |= XT_CT_ZONE_DIR_ORIG;
if (opt_id == O_ZONE_REPLY)
*flags |= XT_CT_ZONE_DIR_REPL;
*zone_id = 0;
if (strcasecmp(opt, "mark") == 0) {
*flags |= XT_CT_ZONE_MARK;
} else {
uintmax_t val;
if (!xtables_strtoul(opt, NULL, &val, 0, UINT16_MAX))
xtables_error(PARAMETER_PROBLEM,
"Cannot parse %s as a zone ID\n", opt);
*zone_id = (uint16_t)val;
}
}
static void ct_print_zone_id(const char *pfx, uint16_t zone_id, uint16_t flags)
{
printf(" %s", pfx);
if ((flags & (XT_CT_ZONE_DIR_ORIG |
XT_CT_ZONE_DIR_REPL)) == XT_CT_ZONE_DIR_ORIG)
printf("-orig");
if ((flags & (XT_CT_ZONE_DIR_ORIG |
XT_CT_ZONE_DIR_REPL)) == XT_CT_ZONE_DIR_REPL)
printf("-reply");
if (flags & XT_CT_ZONE_MARK)
printf(" mark");
else
printf(" %u", zone_id);
}
static uint32_t ct_parse_events(const struct event_tbl *tbl, unsigned int size,
const char *events)
{
char str[strlen(events) + 1], *e = str, *t;
unsigned int mask = 0, i;
strcpy(str, events);
while ((t = strsep(&e, ","))) {
for (i = 0; i < size; i++) {
if (strcmp(t, tbl[i].name))
continue;
mask |= 1 << tbl[i].event;
break;
}
if (i == size)
xtables_error(PARAMETER_PROBLEM, "Unknown event type \"%s\"", t);
}
return mask;
}
static void ct_print_events(const char *pfx, const struct event_tbl *tbl,
unsigned int size, uint32_t mask)
{
const char *sep = "";
unsigned int i;
printf(" %s ", pfx);
for (i = 0; i < size; i++) {
if (mask & (1 << tbl[i].event)) {
printf("%s%s", sep, tbl[i].name);
sep = ",";
}
}
}
static void ct_parse(struct xt_option_call *cb)
{
struct xt_ct_target_info *info = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_NOTRACK:
info->flags |= XT_CT_NOTRACK;
break;
case O_ZONE_ORIG:
case O_ZONE_REPLY:
case O_ZONE:
ct_parse_zone_id(cb->arg, cb->entry->id, &info->zone,
&info->flags);
break;
case O_CTEVENTS:
info->ct_events = ct_parse_events(ct_event_tbl, ARRAY_SIZE(ct_event_tbl), cb->arg);
break;
case O_EXPEVENTS:
info->exp_events = ct_parse_events(exp_event_tbl, ARRAY_SIZE(exp_event_tbl), cb->arg);
break;
}
}
static void ct_parse_v1(struct xt_option_call *cb)
{
struct xt_ct_target_info_v1 *info = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_NOTRACK:
info->flags |= XT_CT_NOTRACK;
break;
case O_ZONE_ORIG:
case O_ZONE_REPLY:
case O_ZONE:
ct_parse_zone_id(cb->arg, cb->entry->id, &info->zone,
&info->flags);
break;
case O_CTEVENTS:
info->ct_events = ct_parse_events(ct_event_tbl,
ARRAY_SIZE(ct_event_tbl),
cb->arg);
break;
case O_EXPEVENTS:
info->exp_events = ct_parse_events(exp_event_tbl,
ARRAY_SIZE(exp_event_tbl),
cb->arg);
break;
}
}
static void ct_print(const void *ip, const struct xt_entry_target *target, int numeric)
{
const struct xt_ct_target_info *info =
(const struct xt_ct_target_info *)target->data;
printf(" CT");
if (info->flags & XT_CT_NOTRACK)
printf(" notrack");
if (info->helper[0])
printf(" helper %s", info->helper);
if (info->ct_events)
ct_print_events("ctevents", ct_event_tbl,
ARRAY_SIZE(ct_event_tbl), info->ct_events);
if (info->exp_events)
ct_print_events("expevents", exp_event_tbl,
ARRAY_SIZE(exp_event_tbl), info->exp_events);
if (info->flags & XT_CT_ZONE_MARK || info->zone)
ct_print_zone_id("zone", info->zone, info->flags);
}
static void
ct_print_v1(const void *ip, const struct xt_entry_target *target, int numeric)
{
const struct xt_ct_target_info_v1 *info =
(const struct xt_ct_target_info_v1 *)target->data;
if (info->flags & XT_CT_NOTRACK_ALIAS) {
printf (" NOTRACK");
return;
}
printf(" CT");
if (info->flags & XT_CT_NOTRACK)
printf(" notrack");
if (info->helper[0])
printf(" helper %s", info->helper);
if (info->timeout[0])
printf(" timeout %s", info->timeout);
if (info->ct_events)
ct_print_events("ctevents", ct_event_tbl,
ARRAY_SIZE(ct_event_tbl), info->ct_events);
if (info->exp_events)
ct_print_events("expevents", exp_event_tbl,
ARRAY_SIZE(exp_event_tbl), info->exp_events);
if (info->flags & XT_CT_ZONE_MARK || info->zone)
ct_print_zone_id("zone", info->zone, info->flags);
}
static void ct_save(const void *ip, const struct xt_entry_target *target)
{
const struct xt_ct_target_info *info =
(const struct xt_ct_target_info *)target->data;
if (info->flags & XT_CT_NOTRACK_ALIAS)
return;
if (info->flags & XT_CT_NOTRACK)
printf(" --notrack");
if (info->helper[0])
printf(" --helper %s", info->helper);
if (info->ct_events)
ct_print_events("--ctevents", ct_event_tbl,
ARRAY_SIZE(ct_event_tbl), info->ct_events);
if (info->exp_events)
ct_print_events("--expevents", exp_event_tbl,
ARRAY_SIZE(exp_event_tbl), info->exp_events);
if (info->flags & XT_CT_ZONE_MARK || info->zone)
ct_print_zone_id("--zone", info->zone, info->flags);
}
static void ct_save_v1(const void *ip, const struct xt_entry_target *target)
{
const struct xt_ct_target_info_v1 *info =
(const struct xt_ct_target_info_v1 *)target->data;
if (info->flags & XT_CT_NOTRACK_ALIAS)
return;
if (info->flags & XT_CT_NOTRACK)
printf(" --notrack");
if (info->helper[0])
printf(" --helper %s", info->helper);
if (info->timeout[0])
printf(" --timeout %s", info->timeout);
if (info->ct_events)
ct_print_events("--ctevents", ct_event_tbl,
ARRAY_SIZE(ct_event_tbl), info->ct_events);
if (info->exp_events)
ct_print_events("--expevents", exp_event_tbl,
ARRAY_SIZE(exp_event_tbl), info->exp_events);
if (info->flags & XT_CT_ZONE_MARK || info->zone)
ct_print_zone_id("--zone", info->zone, info->flags);
}
static const char *
ct_print_name_alias(const struct xt_entry_target *target)
{
struct xt_ct_target_info *info = (void *)target->data;
return info->flags & XT_CT_NOTRACK_ALIAS ? "NOTRACK" : "CT";
}
static void notrack_ct0_tg_init(struct xt_entry_target *target)
{
struct xt_ct_target_info *info = (void *)target->data;
info->flags = XT_CT_NOTRACK;
}
static void notrack_ct1_tg_init(struct xt_entry_target *target)
{
struct xt_ct_target_info_v1 *info = (void *)target->data;
info->flags = XT_CT_NOTRACK;
}
static void notrack_ct2_tg_init(struct xt_entry_target *target)
{
struct xt_ct_target_info_v1 *info = (void *)target->data;
info->flags = XT_CT_NOTRACK | XT_CT_NOTRACK_ALIAS;
}
static int xlate_ct1_tg(struct xt_xlate *xl,
const struct xt_xlate_tg_params *params)
{
struct xt_ct_target_info_v1 *info =
(struct xt_ct_target_info_v1 *)params->target->data;
if (info->flags & XT_CT_NOTRACK)
xt_xlate_add(xl, "notrack");
else
return 0;
return 1;
}
static struct xtables_target ct_target_reg[] = {
{
.family = NFPROTO_UNSPEC,
.name = "CT",
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_ct_target_info)),
.userspacesize = offsetof(struct xt_ct_target_info, ct),
.help = ct_help,
.print = ct_print,
.save = ct_save,
.x6_parse = ct_parse,
.x6_options = ct_opts,
},
{
.family = NFPROTO_UNSPEC,
.name = "CT",
.revision = 1,
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_ct_target_info_v1)),
.userspacesize = offsetof(struct xt_ct_target_info_v1, ct),
.help = ct_help_v1,
.print = ct_print_v1,
.save = ct_save_v1,
.x6_parse = ct_parse_v1,
.x6_options = ct_opts_v1,
},
{
.family = NFPROTO_UNSPEC,
.name = "CT",
.revision = 2,
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_ct_target_info_v1)),
.userspacesize = offsetof(struct xt_ct_target_info_v1, ct),
.help = ct_help_v1,
.print = ct_print_v1,
.save = ct_save_v1,
.alias = ct_print_name_alias,
.x6_parse = ct_parse_v1,
.x6_options = ct_opts_v1,
.xlate = xlate_ct1_tg,
},
{
.family = NFPROTO_UNSPEC,
.name = "NOTRACK",
.real_name = "CT",
.revision = 0,
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_ct_target_info)),
.userspacesize = offsetof(struct xt_ct_target_info, ct),
.init = notrack_ct0_tg_init,
},
{
.family = NFPROTO_UNSPEC,
.name = "NOTRACK",
.real_name = "CT",
.revision = 1,
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_ct_target_info_v1)),
.userspacesize = offsetof(struct xt_ct_target_info_v1, ct),
.init = notrack_ct1_tg_init,
},
{
.family = NFPROTO_UNSPEC,
.name = "NOTRACK",
.real_name = "CT",
.revision = 2,
.ext_flags = XTABLES_EXT_ALIAS,
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_ct_target_info_v1)),
.userspacesize = offsetof(struct xt_ct_target_info_v1, ct),
.init = notrack_ct2_tg_init,
.xlate = xlate_ct1_tg,
},
{
.family = NFPROTO_UNSPEC,
.name = "NOTRACK",
.revision = 0,
.version = XTABLES_VERSION,
},
};
void _init(void)
{
xtables_register_targets(ct_target_reg, ARRAY_SIZE(ct_target_reg));
}
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