/*
* libxt_conntrack
* Shared library add-on to iptables for conntrack matching support.
*
* GPL (C) 2001 Marc Boucher (marc@mbsi.ca).
* Copyright © CC Computer Consultants GmbH, 2007 - 2008
* Jan Engelhardt <jengelh@computergmbh.de>
*/
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <xtables.h>
#include <linux/netfilter/xt_conntrack.h>
#include <linux/netfilter/nf_conntrack_common.h>
struct ip_conntrack_old_tuple {
struct {
__be32 ip;
union {
__u16 all;
} u;
} src;
struct {
__be32 ip;
union {
__u16 all;
} u;
/* The protocol. */
__u16 protonum;
} dst;
};
struct xt_conntrack_info {
unsigned int statemask, statusmask;
struct ip_conntrack_old_tuple tuple[IP_CT_DIR_MAX];
struct in_addr sipmsk[IP_CT_DIR_MAX], dipmsk[IP_CT_DIR_MAX];
unsigned long expires_min, expires_max;
/* Flags word */
uint8_t flags;
/* Inverse flags */
uint8_t invflags;
};
enum {
O_CTSTATE = 0,
O_CTPROTO,
O_CTORIGSRC,
O_CTORIGDST,
O_CTREPLSRC,
O_CTREPLDST,
O_CTORIGSRCPORT,
O_CTORIGDSTPORT,
O_CTREPLSRCPORT,
O_CTREPLDSTPORT,
O_CTSTATUS,
O_CTEXPIRE,
O_CTDIR,
};
static void conntrack_mt_help(void)
{
printf(
"conntrack match options:\n"
"[!] --ctstate {INVALID|ESTABLISHED|NEW|RELATED|UNTRACKED|SNAT|DNAT}[,...]\n"
" State(s) to match\n"
"[!] --ctproto proto Protocol to match; by number or name, e.g. \"tcp\"\n"
"[!] --ctorigsrc address[/mask]\n"
"[!] --ctorigdst address[/mask]\n"
"[!] --ctreplsrc address[/mask]\n"
"[!] --ctrepldst address[/mask]\n"
" Original/Reply source/destination address\n"
"[!] --ctorigsrcport port\n"
"[!] --ctorigdstport port\n"
"[!] --ctreplsrcport port\n"
"[!] --ctrepldstport port\n"
" TCP/UDP/SCTP orig./reply source/destination port\n"
"[!] --ctstatus {NONE|EXPECTED|SEEN_REPLY|ASSURED|CONFIRMED}[,...]\n"
" Status(es) to match\n"
"[!] --ctexpire time[:time] Match remaining lifetime in seconds against\n"
" value or range of values (inclusive)\n"
" --ctdir {ORIGINAL|REPLY} Flow direction of packet\n");
}
#define s struct xt_conntrack_info /* for v0 */
static const struct xt_option_entry conntrack_mt_opts_v0[] = {
{.name = "ctstate", .id = O_CTSTATE, .type = XTTYPE_STRING,
.flags = XTOPT_INVERT},
{.name = "ctproto", .id = O_CTPROTO, .type = XTTYPE_PROTOCOL,
.flags = XTOPT_INVERT},
{.name = "ctorigsrc", .id = O_CTORIGSRC, .type = XTTYPE_HOST,
.flags = XTOPT_INVERT},
{.name = "ctorigdst", .id = O_CTORIGDST, .type = XTTYPE_HOST,
.flags = XTOPT_INVERT},
{.name = "ctreplsrc", .id = O_CTREPLSRC, .type = XTTYPE_HOST,
.flags = XTOPT_INVERT},
{.name = "ctrepldst", .id = O_CTREPLDST, .type = XTTYPE_HOST,
.flags = XTOPT_INVERT},
{.name = "ctstatus", .id = O_CTSTATUS, .type = XTTYPE_STRING,
.flags = XTOPT_INVERT},
{.name = "ctexpire", .id = O_CTEXPIRE, .type = XTTYPE_UINT32RC,
.flags = XTOPT_INVERT},
XTOPT_TABLEEND,
};
#undef s
#define s struct xt_conntrack_mtinfo3 /* for v1-v3 */
/* We exploit the fact that v1-v3 share the same layout */
static const struct xt_option_entry conntrack_mt_opts[] = {
{.name = "ctstate", .id = O_CTSTATE, .type = XTTYPE_STRING,
.flags = XTOPT_INVERT},
{.name = "ctproto", .id = O_CTPROTO, .type = XTTYPE_PROTOCOL,
.flags = XTOPT_INVERT},
{.name = "ctorigsrc", .id = O_CTORIGSRC, .type = XTTYPE_HOSTMASK,
.flags = XTOPT_INVERT},
{.name = "ctorigdst", .id = O_CTORIGDST, .type = XTTYPE_HOSTMASK,
.flags = XTOPT_INVERT},
{.name = "ctreplsrc", .id = O_CTREPLSRC, .type = XTTYPE_HOSTMASK,
.flags = XTOPT_INVERT},
{.name = "ctrepldst", .id = O_CTREPLDST, .type = XTTYPE_HOSTMASK,
.flags = XTOPT_INVERT},
{.name = "ctstatus", .id = O_CTSTATUS, .type = XTTYPE_STRING,
.flags = XTOPT_INVERT},
{.name = "ctexpire", .id = O_CTEXPIRE, .type = XTTYPE_UINT32RC,
.flags = XTOPT_INVERT},
{.name = "ctorigsrcport", .id = O_CTORIGSRCPORT, .type = XTTYPE_PORTRC,
.flags = XTOPT_INVERT},
{.name = "ctorigdstport", .id = O_CTORIGDSTPORT, .type = XTTYPE_PORTRC,
.flags = XTOPT_INVERT},
{.name = "ctreplsrcport", .id = O_CTREPLSRCPORT, .type = XTTYPE_PORTRC,
.flags = XTOPT_INVERT},
{.name = "ctrepldstport", .id = O_CTREPLDSTPORT, .type = XTTYPE_PORTRC,
.flags = XTOPT_INVERT},
{.name = "ctdir", .id = O_CTDIR, .type = XTTYPE_STRING},
XTOPT_TABLEEND,
};
#undef s
static int
parse_state(const char *state, size_t len, struct xt_conntrack_info *sinfo)
{
if (strncasecmp(state, "INVALID", len) == 0)
sinfo->statemask |= XT_CONNTRACK_STATE_INVALID;
else if (strncasecmp(state, "NEW", len) == 0)
sinfo->statemask |= XT_CONNTRACK_STATE_BIT(IP_CT_NEW);
else if (strncasecmp(state, "ESTABLISHED", len) == 0)
sinfo->statemask |= XT_CONNTRACK_STATE_BIT(IP_CT_ESTABLISHED);
else if (strncasecmp(state, "RELATED", len) == 0)
sinfo->statemask |= XT_CONNTRACK_STATE_BIT(IP_CT_RELATED);
else if (strncasecmp(state, "UNTRACKED", len) == 0)
sinfo->statemask |= XT_CONNTRACK_STATE_UNTRACKED;
else if (strncasecmp(state, "SNAT", len) == 0)
sinfo->statemask |= XT_CONNTRACK_STATE_SNAT;
else if (strncasecmp(state, "DNAT", len) == 0)
sinfo->statemask |= XT_CONNTRACK_STATE_DNAT;
else
return 0;
return 1;
}
static void
parse_states(const char *arg, struct xt_conntrack_info *sinfo)
{
const char *comma;
while ((comma = strchr(arg, ',')) != NULL) {
if (comma == arg || !parse_state(arg, comma-arg, sinfo))
xtables_error(PARAMETER_PROBLEM, "Bad ctstate \"%s\"", arg);
arg = comma+1;
}
if (!*arg)
xtables_error(PARAMETER_PROBLEM, "\"--ctstate\" requires a list of "
"states with no spaces, e.g. "
"ESTABLISHED,RELATED");
if (strlen(arg) == 0 || !parse_state(arg, strlen(arg), sinfo))
xtables_error(PARAMETER_PROBLEM, "Bad ctstate \"%s\"", arg);
}
static bool
conntrack_ps_state(struct xt_conntrack_mtinfo3 *info, const char *state,
size_t z)
{
if (strncasecmp(state, "INVALID", z) == 0)
info->state_mask |= XT_CONNTRACK_STATE_INVALID;
else if (strncasecmp(state, "NEW", z) == 0)
info->state_mask |= XT_CONNTRACK_STATE_BIT(IP_CT_NEW);
else if (strncasecmp(state, "ESTABLISHED", z) == 0)
info->state_mask |= XT_CONNTRACK_STATE_BIT(IP_CT_ESTABLISHED);
else if (strncasecmp(state, "RELATED", z) == 0)
info->state_mask |= XT_CONNTRACK_STATE_BIT(IP_CT_RELATED);
else if (strncasecmp(state, "UNTRACKED", z) == 0)
info->state_mask |= XT_CONNTRACK_STATE_UNTRACKED;
else if (strncasecmp(state, "SNAT", z) == 0)
info->state_mask |= XT_CONNTRACK_STATE_SNAT;
else if (strncasecmp(state, "DNAT", z) == 0)
info->state_mask |= XT_CONNTRACK_STATE_DNAT;
else
return false;
return true;
}
static void
conntrack_ps_states(struct xt_conntrack_mtinfo3 *info, const char *arg)
{
const char *comma;
while ((comma = strchr(arg, ',')) != NULL) {
if (comma == arg || !conntrack_ps_state(info, arg, comma - arg))
xtables_error(PARAMETER_PROBLEM,
"Bad ctstate \"%s\"", arg);
arg = comma + 1;
}
if (strlen(arg) == 0 || !conntrack_ps_state(info, arg, strlen(arg)))
xtables_error(PARAMETER_PROBLEM, "Bad ctstate \"%s\"", arg);
}
static int
parse_status(const char *status, size_t len, struct xt_conntrack_info *sinfo)
{
if (strncasecmp(status, "NONE", len) == 0)
sinfo->statusmask |= 0;
else if (strncasecmp(status, "EXPECTED", len) == 0)
sinfo->statusmask |= IPS_EXPECTED;
else if (strncasecmp(status, "SEEN_REPLY", len) == 0)
sinfo->statusmask |= IPS_SEEN_REPLY;
else if (strncasecmp(status, "ASSURED", len) == 0)
sinfo->statusmask |= IPS_ASSURED;
#ifdef IPS_CONFIRMED
else if (strncasecmp(status, "CONFIRMED", len) == 0)
sinfo->statusmask |= IPS_CONFIRMED;
#endif
else
return 0;
return 1;
}
static void
parse_statuses(const char *arg, struct xt_conntrack_info *sinfo)
{
const char *comma;
while ((comma = strchr(arg, ',')) != NULL) {
if (comma == arg || !parse_status(arg, comma-arg, sinfo))
xtables_error(PARAMETER_PROBLEM, "Bad ctstatus \"%s\"", arg);
arg = comma+1;
}
if (strlen(arg) == 0 || !parse_status(arg, strlen(arg), sinfo))
xtables_error(PARAMETER_PROBLEM, "Bad ctstatus \"%s\"", arg);
}
static bool
conntrack_ps_status(struct xt_conntrack_mtinfo3 *info, const char *status,
size_t z)
{
if (strncasecmp(status, "NONE", z) == 0)
info->status_mask |= 0;
else if (strncasecmp(status, "EXPECTED", z) == 0)
info->status_mask |= IPS_EXPECTED;
else if (strncasecmp(status, "SEEN_REPLY", z) == 0)
info->status_mask |= IPS_SEEN_REPLY;
else if (strncasecmp(status, "ASSURED", z) == 0)
info->status_mask |= IPS_ASSURED;
else if (strncasecmp(status, "CONFIRMED", z) == 0)
info->status_mask |= IPS_CONFIRMED;
else
return false;
return true;
}
static void
conntrack_ps_statuses(struct xt_conntrack_mtinfo3 *info, const char *arg)
{
const char *comma;
while ((comma = strchr(arg, ',')) != NULL) {
if (comma == arg || !conntrack_ps_status(info, arg, comma - arg))
xtables_error(PARAMETER_PROBLEM,
"Bad ctstatus \"%s\"", arg);
arg = comma + 1;
}
if (strlen(arg) == 0 || !conntrack_ps_status(info, arg, strlen(arg)))
xtables_error(PARAMETER_PROBLEM, "Bad ctstatus \"%s\"", arg);
}
static void conntrack_parse(struct xt_option_call *cb)
{
struct xt_conntrack_info *sinfo = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_CTSTATE:
parse_states(cb->arg, sinfo);
if (cb->invert)
sinfo->invflags |= XT_CONNTRACK_STATE;
break;
case O_CTPROTO:
if (cb->invert)
sinfo->invflags |= XT_CONNTRACK_PROTO;
sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.protonum = cb->val.protocol;
if (sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.protonum == 0
&& (sinfo->invflags & XT_INV_PROTO))
xtables_error(PARAMETER_PROBLEM,
"rule would never match protocol");
sinfo->flags |= XT_CONNTRACK_PROTO;
break;
case O_CTORIGSRC:
if (cb->invert)
sinfo->invflags |= XT_CONNTRACK_ORIGSRC;
sinfo->tuple[IP_CT_DIR_ORIGINAL].src.ip = cb->val.haddr.ip;
sinfo->flags |= XT_CONNTRACK_ORIGSRC;
break;
case O_CTORIGDST:
if (cb->invert)
sinfo->invflags |= XT_CONNTRACK_ORIGDST;
sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.ip = cb->val.haddr.ip;
sinfo->flags |= XT_CONNTRACK_ORIGDST;
break;
case O_CTREPLSRC:
if (cb->invert)
sinfo->invflags |= XT_CONNTRACK_REPLSRC;
sinfo->tuple[IP_CT_DIR_REPLY].src.ip = cb->val.haddr.ip;
sinfo->flags |= XT_CONNTRACK_REPLSRC;
break;
case O_CTREPLDST:
if (cb->invert)
sinfo->invflags |= XT_CONNTRACK_REPLDST;
sinfo->tuple[IP_CT_DIR_REPLY].dst.ip = cb->val.haddr.ip;
sinfo->flags |= XT_CONNTRACK_REPLDST;
break;
case O_CTSTATUS:
parse_statuses(cb->arg, sinfo);
if (cb->invert)
sinfo->invflags |= XT_CONNTRACK_STATUS;
sinfo->flags |= XT_CONNTRACK_STATUS;
break;
case O_CTEXPIRE:
sinfo->expires_min = cb->val.u32_range[0];
sinfo->expires_max = cb->val.u32_range[0];
if (cb->nvals >= 2)
sinfo->expires_max = cb->val.u32_range[1];
if (cb->invert)
sinfo->invflags |= XT_CONNTRACK_EXPIRES;
sinfo->flags |= XT_CONNTRACK_EXPIRES;
break;
}
}
static void conntrack_mt_parse(struct xt_option_call *cb, uint8_t rev)
{
struct xt_conntrack_mtinfo3 *info = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_CTSTATE:
conntrack_ps_states(info, cb->arg);
info->match_flags |= XT_CONNTRACK_STATE;
if (cb->invert)
info->invert_flags |= XT_CONNTRACK_STATE;
break;
case O_CTPROTO:
info->l4proto = cb->val.protocol;
if (info->l4proto == 0 && (info->invert_flags & XT_INV_PROTO))
xtables_error(PARAMETER_PROBLEM, "conntrack: rule would "
"never match protocol");
info->match_flags |= XT_CONNTRACK_PROTO;
if (cb->invert)
info->invert_flags |= XT_CONNTRACK_PROTO;
break;
case O_CTORIGSRC:
info->origsrc_addr = cb->val.haddr;
info->origsrc_mask = cb->val.hmask;
info->match_flags |= XT_CONNTRACK_ORIGSRC;
if (cb->invert)
info->invert_flags |= XT_CONNTRACK_ORIGSRC;
break;
case O_CTORIGDST:
info->origdst_addr = cb->val.haddr;
info->origdst_mask = cb->val.hmask;
info->match_flags |= XT_CONNTRACK_ORIGDST;
if (cb->invert)
info->invert_flags |= XT_CONNTRACK_ORIGDST;
break;
case O_CTREPLSRC:
info->replsrc_addr = cb->val.haddr;
info->replsrc_mask = cb->val.hmask;
info->match_flags |= XT_CONNTRACK_REPLSRC;
if (cb->invert)
info->invert_flags |= XT_CONNTRACK_REPLSRC;
break;
case O_CTREPLDST:
info->repldst_addr = cb->val.haddr;
info->repldst_mask = cb->val.hmask;
info->match_flags |= XT_CONNTRACK_REPLDST;
if (cb->invert)
info->invert_flags |= XT_CONNTRACK_REPLDST;
break;
case O_CTSTATUS:
conntrack_ps_statuses(info, cb->arg);
info->match_flags |= XT_CONNTRACK_STATUS;
if (cb->invert)
info->invert_flags |= XT_CONNTRACK_STATUS;
break;
case O_CTEXPIRE:
info->expires_min = cb->val.u32_range[0];
info->expires_max = cb->val.u32_range[0];
if (cb->nvals >= 2)
info->expires_max = cb->val.u32_range[1];
info->match_flags |= XT_CONNTRACK_EXPIRES;
if (cb->invert)
info->invert_flags |= XT_CONNTRACK_EXPIRES;
break;
case O_CTORIGSRCPORT:
info->origsrc_port = cb->val.port_range[0];
info->origsrc_port_high = cb->val.port_range[cb->nvals >= 2];
info->match_flags |= XT_CONNTRACK_ORIGSRC_PORT;
if (cb->invert)
info->invert_flags |= XT_CONNTRACK_ORIGSRC_PORT;
break;
case O_CTORIGDSTPORT:
info->origdst_port = cb->val.port_range[0];
info->origdst_port_high = cb->val.port_range[cb->nvals >= 2];
info->match_flags |= XT_CONNTRACK_ORIGDST_PORT;
if (cb->invert)
info->invert_flags |= XT_CONNTRACK_ORIGDST_PORT;
break;
case O_CTREPLSRCPORT:
info->replsrc_port = cb->val.port_range[0];
info->replsrc_port_high = cb->val.port_range[cb->nvals >= 2];
info->match_flags |= XT_CONNTRACK_REPLSRC_PORT;
if (cb->invert)
info->invert_flags |= XT_CONNTRACK_REPLSRC_PORT;
break;
case O_CTREPLDSTPORT:
info->repldst_port = cb->val.port_range[0];
info->repldst_port_high = cb->val.port_range[cb->nvals >= 2];
info->match_flags |= XT_CONNTRACK_REPLDST_PORT;
if (cb->invert)
info->invert_flags |= XT_CONNTRACK_REPLDST_PORT;
break;
case O_CTDIR:
if (strcasecmp(cb->arg, "ORIGINAL") == 0) {
info->match_flags |= XT_CONNTRACK_DIRECTION;
info->invert_flags &= ~XT_CONNTRACK_DIRECTION;
} else if (strcasecmp(cb->arg, "REPLY") == 0) {
info->match_flags |= XT_CONNTRACK_DIRECTION;
info->invert_flags |= XT_CONNTRACK_DIRECTION;
} else {
xtables_param_act(XTF_BAD_VALUE, "conntrack", "--ctdir", cb->arg);
}
break;
}
}
#define cinfo_transform(r, l) \
do { \
memcpy((r), (l), offsetof(typeof(*(l)), state_mask)); \
(r)->state_mask = (l)->state_mask; \
(r)->status_mask = (l)->status_mask; \
} while (false);
static void conntrack1_mt_parse(struct xt_option_call *cb)
{
struct xt_conntrack_mtinfo1 *info = cb->data;
struct xt_conntrack_mtinfo3 up;
memset(&up, 0, sizeof(up));
cinfo_transform(&up, info);
up.origsrc_port_high = up.origsrc_port;
up.origdst_port_high = up.origdst_port;
up.replsrc_port_high = up.replsrc_port;
up.repldst_port_high = up.repldst_port;
cb->data = &up;
conntrack_mt_parse(cb, 3);
if (up.origsrc_port != up.origsrc_port_high ||
up.origdst_port != up.origdst_port_high ||
up.replsrc_port != up.replsrc_port_high ||
up.repldst_port != up.repldst_port_high)
xtables_error(PARAMETER_PROBLEM,
"conntrack rev 1 does not support port ranges");
cinfo_transform(info, &up);
cb->data = info;
}
static void conntrack2_mt_parse(struct xt_option_call *cb)
{
#define cinfo2_transform(r, l) \
memcpy((r), (l), offsetof(typeof(*(l)), sizeof(*info));
struct xt_conntrack_mtinfo2 *info = cb->data;
struct xt_conntrack_mtinfo3 up;
memset(&up, 0, sizeof(up));
memcpy(&up, info, sizeof(*info));
up.origsrc_port_high = up.origsrc_port;
up.origdst_port_high = up.origdst_port;
up.replsrc_port_high = up.replsrc_port;
up.repldst_port_high = up.repldst_port;
cb->data = &up;
conntrack_mt_parse(cb, 3);
if (up.origsrc_port != up.origsrc_port_high ||
up.origdst_port != up.origdst_port_high ||
up.replsrc_port != up.replsrc_port_high ||
up.repldst_port != up.repldst_port_high)
xtables_error(PARAMETER_PROBLEM,
"conntrack rev 2 does not support port ranges");
memcpy(info, &up, sizeof(*info));
cb->data = info;
#undef cinfo2_transform
}
static void conntrack3_mt_parse(struct xt_option_call *cb)
{
conntrack_mt_parse(cb, 3);
}
static void conntrack_mt_check(struct xt_fcheck_call *cb)
{
if (cb->xflags == 0)
xtables_error(PARAMETER_PROBLEM, "conntrack: At least one option "
"is required");
}
static void
print_state(unsigned int statemask)
{
const char *sep = " ";
if (statemask & XT_CONNTRACK_STATE_INVALID) {
printf("%sINVALID", sep);
sep = ",";
}
if (statemask & XT_CONNTRACK_STATE_BIT(IP_CT_NEW)) {
printf("%sNEW", sep);
sep = ",";
}
if (statemask & XT_CONNTRACK_STATE_BIT(IP_CT_RELATED)) {
printf("%sRELATED", sep);
sep = ",";
}
if (statemask & XT_CONNTRACK_STATE_BIT(IP_CT_ESTABLISHED)) {
printf("%sESTABLISHED", sep);
sep = ",";
}
if (statemask & XT_CONNTRACK_STATE_UNTRACKED) {
printf("%sUNTRACKED", sep);
sep = ",";
}
if (statemask & XT_CONNTRACK_STATE_SNAT) {
printf("%sSNAT", sep);
sep = ",";
}
if (statemask & XT_CONNTRACK_STATE_DNAT) {
printf("%sDNAT", sep);
sep = ",";
}
}
static void
print_status(unsigned int statusmask)
{
const char *sep = " ";
if (statusmask & IPS_EXPECTED) {
printf("%sEXPECTED", sep);
sep = ",";
}
if (statusmask & IPS_SEEN_REPLY) {
printf("%sSEEN_REPLY", sep);
sep = ",";
}
if (statusmask & IPS_ASSURED) {
printf("%sASSURED", sep);
sep = ",";
}
if (statusmask & IPS_CONFIRMED) {
printf("%sCONFIRMED", sep);
sep = ",";
}
if (statusmask == 0)
printf("%sNONE", sep);
}
static void
conntrack_dump_addr(const union nf_inet_addr *addr,
const union nf_inet_addr *mask,
unsigned int family, bool numeric)
{
if (family == NFPROTO_IPV4) {
if (!numeric && addr->ip == 0) {
printf(" anywhere");
return;
}
if (numeric)
printf(" %s%s",
xtables_ipaddr_to_numeric(&addr->in),
xtables_ipmask_to_numeric(&mask->in));
else
printf(" %s%s",
xtables_ipaddr_to_anyname(&addr->in),
xtables_ipmask_to_numeric(&mask->in));
} else if (family == NFPROTO_IPV6) {
if (!numeric && addr->ip6[0] == 0 && addr->ip6[1] == 0 &&
addr->ip6[2] == 0 && addr->ip6[3] == 0) {
printf(" anywhere");
return;
}
if (numeric)
printf(" %s%s",
xtables_ip6addr_to_numeric(&addr->in6),
xtables_ip6mask_to_numeric(&mask->in6));
else
printf(" %s%s",
xtables_ip6addr_to_anyname(&addr->in6),
xtables_ip6mask_to_numeric(&mask->in6));
}
}
static void
print_addr(const struct in_addr *addr, const struct in_addr *mask,
int inv, int numeric)
{
char buf[BUFSIZ];
if (inv)
printf(" !");
if (mask->s_addr == 0L && !numeric)
printf(" %s", "anywhere");
else {
if (numeric)
strcpy(buf, xtables_ipaddr_to_numeric(addr));
else
strcpy(buf, xtables_ipaddr_to_anyname(addr));
strcat(buf, xtables_ipmask_to_numeric(mask));
printf(" %s", buf);
}
}
static void
matchinfo_print(const void *ip, const struct xt_entry_match *match, int numeric, const char *optpfx)
{
const struct xt_conntrack_info *sinfo = (const void *)match->data;
if(sinfo->flags & XT_CONNTRACK_STATE) {
if (sinfo->invflags & XT_CONNTRACK_STATE)
printf(" !");
printf(" %sctstate", optpfx);
print_state(sinfo->statemask);
}
if(sinfo->flags & XT_CONNTRACK_PROTO) {
if (sinfo->invflags & XT_CONNTRACK_PROTO)
printf(" !");
printf(" %sctproto", optpfx);
printf(" %u", sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.protonum);
}
if(sinfo->flags & XT_CONNTRACK_ORIGSRC) {
if (sinfo->invflags & XT_CONNTRACK_ORIGSRC)
printf(" !");
printf(" %sctorigsrc", optpfx);
print_addr(
(struct in_addr *)&sinfo->tuple[IP_CT_DIR_ORIGINAL].src.ip,
&sinfo->sipmsk[IP_CT_DIR_ORIGINAL],
false,
numeric);
}
if(sinfo->flags & XT_CONNTRACK_ORIGDST) {
if (sinfo->invflags & XT_CONNTRACK_ORIGDST)
printf(" !");
printf(" %sctorigdst", optpfx);
print_addr(
(struct in_addr *)&sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.ip,
&sinfo->dipmsk[IP_CT_DIR_ORIGINAL],
false,
numeric);
}
if(sinfo->flags & XT_CONNTRACK_REPLSRC) {
if (sinfo->invflags & XT_CONNTRACK_REPLSRC)
printf(" !");
printf(" %sctreplsrc", optpfx);
print_addr(
(struct in_addr *)&sinfo->tuple[IP_CT_DIR_REPLY].src.ip,
&sinfo->sipmsk[IP_CT_DIR_REPLY],
false,
numeric);
}
if(sinfo->flags & XT_CONNTRACK_REPLDST) {
if (sinfo->invflags & XT_CONNTRACK_REPLDST)
printf(" !");
printf(" %sctrepldst", optpfx);
print_addr(
(struct in_addr *)&sinfo->tuple[IP_CT_DIR_REPLY].dst.ip,
&sinfo->dipmsk[IP_CT_DIR_REPLY],
false,
numeric);
}
if(sinfo->flags & XT_CONNTRACK_STATUS) {
if (sinfo->invflags & XT_CONNTRACK_STATUS)
printf(" !");
printf(" %sctstatus", optpfx);
print_status(sinfo->statusmask);
}
if(sinfo->flags & XT_CONNTRACK_EXPIRES) {
if (sinfo->invflags & XT_CONNTRACK_EXPIRES)
printf(" !");
printf(" %sctexpire ", optpfx);
if (sinfo->expires_max == sinfo->expires_min)
printf("%lu", sinfo->expires_min);
else
printf("%lu:%lu", sinfo->expires_min, sinfo->expires_max);
}
if (sinfo->flags & XT_CONNTRACK_DIRECTION) {
if (sinfo->invflags & XT_CONNTRACK_DIRECTION)
printf(" %sctdir REPLY", optpfx);
else
printf(" %sctdir ORIGINAL", optpfx);
}
}
static void
conntrack_dump_ports(const char *prefix, const char *opt,
u_int16_t port_low, u_int16_t port_high)
{
if (port_high == 0 || port_low == port_high)
printf(" %s%s %u", prefix, opt, port_low);
else
printf(" %s%s %u:%u", prefix, opt, port_low, port_high);
}
static void
conntrack_dump(const struct xt_conntrack_mtinfo3 *info, const char *prefix,
unsigned int family, bool numeric, bool v3)
{
if (info->match_flags & XT_CONNTRACK_STATE) {
if (info->invert_flags & XT_CONNTRACK_STATE)
printf(" !");
printf(" %sctstate", prefix);
print_state(info->state_mask);
}
if (info->match_flags & XT_CONNTRACK_PROTO) {
if (info->invert_flags & XT_CONNTRACK_PROTO)
printf(" !");
printf(" %sctproto %u", prefix, info->l4proto);
}
if (info->match_flags & XT_CONNTRACK_ORIGSRC) {
if (info->invert_flags & XT_CONNTRACK_ORIGSRC)
printf(" !");
printf(" %sctorigsrc", prefix);
conntrack_dump_addr(&info->origsrc_addr, &info->origsrc_mask,
family, numeric);
}
if (info->match_flags & XT_CONNTRACK_ORIGDST) {
if (info->invert_flags & XT_CONNTRACK_ORIGDST)
printf(" !");
printf(" %sctorigdst", prefix);
conntrack_dump_addr(&info->origdst_addr, &info->origdst_mask,
family, numeric);
}
if (info->match_flags & XT_CONNTRACK_REPLSRC) {
if (info->invert_flags & XT_CONNTRACK_REPLSRC)
printf(" !");
printf(" %sctreplsrc", prefix);
conntrack_dump_addr(&info->replsrc_addr, &info->replsrc_mask,
family, numeric);
}
if (info->match_flags & XT_CONNTRACK_REPLDST) {
if (info->invert_flags & XT_CONNTRACK_REPLDST)
printf(" !");
printf(" %sctrepldst", prefix);
conntrack_dump_addr(&info->repldst_addr, &info->repldst_mask,
family, numeric);
}
if (info->match_flags & XT_CONNTRACK_ORIGSRC_PORT) {
if (info->invert_flags & XT_CONNTRACK_ORIGSRC_PORT)
printf(" !");
conntrack_dump_ports(prefix, "ctorigsrcport",
v3 ? info->origsrc_port : ntohs(info->origsrc_port),
v3 ? info->origsrc_port_high : 0);
}
if (info->match_flags & XT_CONNTRACK_ORIGDST_PORT) {
if (info->invert_flags & XT_CONNTRACK_ORIGDST_PORT)
printf(" !");
conntrack_dump_ports(prefix, "ctorigdstport",
v3 ? info->origdst_port : ntohs(info->origdst_port),
v3 ? info->origdst_port_high : 0);
}
if (info->match_flags & XT_CONNTRACK_REPLSRC_PORT) {
if (info->invert_flags & XT_CONNTRACK_REPLSRC_PORT)
printf(" !");
conntrack_dump_ports(prefix, "ctreplsrcport",
v3 ? info->replsrc_port : ntohs(info->replsrc_port),
v3 ? info->replsrc_port_high : 0);
}
if (info->match_flags & XT_CONNTRACK_REPLDST_PORT) {
if (info->invert_flags & XT_CONNTRACK_REPLDST_PORT)
printf(" !");
conntrack_dump_ports(prefix, "ctrepldstport",
v3 ? info->repldst_port : ntohs(info->repldst_port),
v3 ? info->repldst_port_high : 0);
}
if (info->match_flags & XT_CONNTRACK_STATUS) {
if (info->invert_flags & XT_CONNTRACK_STATUS)
printf(" !");
printf(" %sctstatus", prefix);
print_status(info->status_mask);
}
if (info->match_flags & XT_CONNTRACK_EXPIRES) {
if (info->invert_flags & XT_CONNTRACK_EXPIRES)
printf(" !");
printf(" %sctexpire ", prefix);
if (info->expires_max == info->expires_min)
printf("%u", (unsigned int)info->expires_min);
else
printf("%u:%u", (unsigned int)info->expires_min,
(unsigned int)info->expires_max);
}
if (info->match_flags & XT_CONNTRACK_DIRECTION) {
if (info->invert_flags & XT_CONNTRACK_DIRECTION)
printf(" %sctdir REPLY", prefix);
else
printf(" %sctdir ORIGINAL", prefix);
}
}
static void conntrack_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
matchinfo_print(ip, match, numeric, "");
}
static void
conntrack1_mt4_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct xt_conntrack_mtinfo1 *info = (void *)match->data;
struct xt_conntrack_mtinfo3 up;
cinfo_transform(&up, info);
conntrack_dump(&up, "", NFPROTO_IPV4, numeric, false);
}
static void
conntrack1_mt6_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct xt_conntrack_mtinfo1 *info = (void *)match->data;
struct xt_conntrack_mtinfo3 up;
cinfo_transform(&up, info);
conntrack_dump(&up, "", NFPROTO_IPV6, numeric, false);
}
static void
conntrack2_mt_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
conntrack_dump((const void *)match->data, "", NFPROTO_IPV4, numeric, false);
}
static void
conntrack2_mt6_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
conntrack_dump((const void *)match->data, "", NFPROTO_IPV6, numeric, false);
}
static void
conntrack3_mt_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
conntrack_dump((const void *)match->data, "", NFPROTO_IPV4, numeric, true);
}
static void
conntrack3_mt6_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
conntrack_dump((const void *)match->data, "", NFPROTO_IPV6, numeric, true);
}
static void conntrack_save(const void *ip, const struct xt_entry_match *match)
{
matchinfo_print(ip, match, 1, "--");
}
static void conntrack3_mt_save(const void *ip,
const struct xt_entry_match *match)
{
conntrack_dump((const void *)match->data, "--", NFPROTO_IPV4, true, true);
}
static void conntrack3_mt6_save(const void *ip,
const struct xt_entry_match *match)
{
conntrack_dump((const void *)match->data, "--", NFPROTO_IPV6, true, true);
}
static void conntrack2_mt_save(const void *ip,
const struct xt_entry_match *match)
{
conntrack_dump((const void *)match->data, "--", NFPROTO_IPV4, true, false);
}
static void conntrack2_mt6_save(const void *ip,
const struct xt_entry_match *match)
{
conntrack_dump((const void *)match->data, "--", NFPROTO_IPV6, true, false);
}
static void
conntrack1_mt4_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_conntrack_mtinfo1 *info = (void *)match->data;
struct xt_conntrack_mtinfo3 up;
cinfo_transform(&up, info);
conntrack_dump(&up, "--", NFPROTO_IPV4, true, false);
}
static void
conntrack1_mt6_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_conntrack_mtinfo1 *info = (void *)match->data;
struct xt_conntrack_mtinfo3 up;
cinfo_transform(&up, info);
conntrack_dump(&up, "--", NFPROTO_IPV6, true, false);
}
static struct xtables_match conntrack_mt_reg[] = {
{
.version = XTABLES_VERSION,
.name = "conntrack",
.revision = 0,
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct xt_conntrack_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_conntrack_info)),
.help = conntrack_mt_help,
.x6_parse = conntrack_parse,
.x6_fcheck = conntrack_mt_check,
.print = conntrack_print,
.save = conntrack_save,
.x6_options = conntrack_mt_opts_v0,
},
{
.version = XTABLES_VERSION,
.name = "conntrack",
.revision = 1,
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo1)),
.userspacesize = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo1)),
.help = conntrack_mt_help,
.x6_parse = conntrack1_mt_parse,
.x6_fcheck = conntrack_mt_check,
.print = conntrack1_mt4_print,
.save = conntrack1_mt4_save,
.x6_options = conntrack_mt_opts,
},
{
.version = XTABLES_VERSION,
.name = "conntrack",
.revision = 1,
.family = NFPROTO_IPV6,
.size = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo1)),
.userspacesize = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo1)),
.help = conntrack_mt_help,
.x6_parse = conntrack1_mt_parse,
.x6_fcheck = conntrack_mt_check,
.print = conntrack1_mt6_print,
.save = conntrack1_mt6_save,
.x6_options = conntrack_mt_opts,
},
{
.version = XTABLES_VERSION,
.name = "conntrack",
.revision = 2,
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo2)),
.userspacesize = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo2)),
.help = conntrack_mt_help,
.x6_parse = conntrack2_mt_parse,
.x6_fcheck = conntrack_mt_check,
.print = conntrack2_mt_print,
.save = conntrack2_mt_save,
.x6_options = conntrack_mt_opts,
},
{
.version = XTABLES_VERSION,
.name = "conntrack",
.revision = 2,
.family = NFPROTO_IPV6,
.size = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo2)),
.userspacesize = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo2)),
.help = conntrack_mt_help,
.x6_parse = conntrack2_mt_parse,
.x6_fcheck = conntrack_mt_check,
.print = conntrack2_mt6_print,
.save = conntrack2_mt6_save,
.x6_options = conntrack_mt_opts,
},
{
.version = XTABLES_VERSION,
.name = "conntrack",
.revision = 3,
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo3)),
.userspacesize = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo3)),
.help = conntrack_mt_help,
.x6_parse = conntrack3_mt_parse,
.x6_fcheck = conntrack_mt_check,
.print = conntrack3_mt_print,
.save = conntrack3_mt_save,
.x6_options = conntrack_mt_opts,
},
{
.version = XTABLES_VERSION,
.name = "conntrack",
.revision = 3,
.family = NFPROTO_IPV6,
.size = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo3)),
.userspacesize = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo3)),
.help = conntrack_mt_help,
.x6_parse = conntrack3_mt_parse,
.x6_fcheck = conntrack_mt_check,
.print = conntrack3_mt6_print,
.save = conntrack3_mt6_save,
.x6_options = conntrack_mt_opts,
},
};
void _init(void)
{
xtables_register_matches(conntrack_mt_reg, ARRAY_SIZE(conntrack_mt_reg));
}