The 'id' key allows for matching on the id of the conntrack entry.
This is most useful as a key for maps
nft add map nat conntoip { type ct_id: ipv4_addr \; }
nft add rule ip nat postrouting snat ct id map @conntoip
Signed-off-by: Brett Mastbergen <bmastbergen@xxxxxxxxxxxx>
---
doc/payload-expression.txt | 5 ++++-
include/ct.h | 1 +
include/datatype.h | 1 +
include/linux/netfilter/nf_tables.h | 2 ++
src/ct.c | 11 +++++++++++
src/datatype.c | 1 +
src/parser_bison.y | 1 +
7 files changed, 21 insertions(+), 1 deletion(-)
diff --git a/doc/payload-expression.txt b/doc/payload-expression.txt
index 28061f3..e93022b 100644
--- a/doc/payload-expression.txt
+++ b/doc/payload-expression.txt
@@ -588,7 +588,7 @@ is true for the *zone*, if a direction is given, the zone is only matched if the
zone id is tied to the given direction. +
[verse]
-*ct* {state | direction | status | mark | expiration | helper | label | l3proto | protocol | bytes | packets | avgpkt | zone}
+*ct* {state | direction | status | mark | expiration | helper | label | l3proto | protocol | bytes | packets | avgpkt | zone | id}
*ct* {original | reply} {l3proto | protocol | proto-src | proto-dst | bytes | packets | avgpkt | zone}
*ct* {original | reply} {ip | ip6} {saddr | daddr}
@@ -650,6 +650,9 @@ integer (16 bit)
|count|
count number of connections
integer (32 bit)
+|id|
+Connection id
+ct_id
|==========================================
A description of conntrack-specific types listed above can be found sub-section CONNTRACK TYPES above.
diff --git a/include/ct.h b/include/ct.h
index 4c5bd80..1e707e7 100644
--- a/include/ct.h
+++ b/include/ct.h
@@ -39,5 +39,6 @@ extern const char *ct_label2str(unsigned long value);
extern const struct datatype ct_dir_type;
extern const struct datatype ct_state_type;
extern const struct datatype ct_status_type;
+extern const struct datatype ct_id_type;
#endif /* NFTABLES_CT_H */
diff --git a/include/datatype.h b/include/datatype.h
index 14ece28..73a9cf2 100644
--- a/include/datatype.h
+++ b/include/datatype.h
@@ -90,6 +90,7 @@ enum datatypes {
TYPE_CT_EVENTBIT,
TYPE_IFNAME,
TYPE_IGMP_TYPE,
+ TYPE_CT_ID,
__TYPE_MAX
};
#define TYPE_MAX (__TYPE_MAX - 1)
diff --git a/include/linux/netfilter/nf_tables.h b/include/linux/netfilter/nf_tables.h
index 09a7b9e..150f32a 100644
--- a/include/linux/netfilter/nf_tables.h
+++ b/include/linux/netfilter/nf_tables.h
@@ -986,6 +986,7 @@ enum nft_osf_flags {
* @NFT_CT_SRC_IP6: conntrack layer 3 protocol source (IPv6 address)
* @NFT_CT_DST_IP6: conntrack layer 3 protocol destination (IPv6 address)
* @NFT_CT_TIMEOUT: connection tracking timeout policy assigned to conntrack
+ * @NFT_CT_ID: conntrack id
*/
enum nft_ct_keys {
NFT_CT_STATE,
@@ -1012,6 +1013,7 @@ enum nft_ct_keys {
NFT_CT_SRC_IP6,
NFT_CT_DST_IP6,
NFT_CT_TIMEOUT,
+ NFT_CT_ID,
__NFT_CT_MAX
};
#define NFT_CT_MAX (__NFT_CT_MAX - 1)
diff --git a/src/ct.c b/src/ct.c
index 2256ce3..21bc182 100644
--- a/src/ct.c
+++ b/src/ct.c
@@ -239,6 +239,15 @@ void ct_label_table_exit(void)
rt_symbol_table_free(ct_label_tbl);
}
+const struct datatype ct_id_type = {
+ .type = TYPE_CT_ID,
+ .name = "ct_id",
+ .desc = "conntrack id",
+ .byteorder = BYTEORDER_BIG_ENDIAN,
+ .size = 4 * BITS_PER_BYTE,
+ .basetype = &integer_type,
+};
+
#ifndef NF_CT_HELPER_NAME_LEN
#define NF_CT_HELPER_NAME_LEN 16
#endif
@@ -291,6 +300,8 @@ const struct ct_template ct_templates[__NFT_CT_MAX] = {
BYTEORDER_HOST_ENDIAN, 16),
[NFT_CT_EVENTMASK] = CT_TEMPLATE("event", &ct_event_type,
BYTEORDER_HOST_ENDIAN, 32),
+ [NFT_CT_ID] = CT_TEMPLATE("id", &ct_id_type,
+ BYTEORDER_BIG_ENDIAN, 32),
};
static void ct_print(enum nft_ct_keys key, int8_t dir, uint8_t nfproto,
diff --git a/src/datatype.c b/src/datatype.c
index ac9f2af..6b76fc9 100644
--- a/src/datatype.c
+++ b/src/datatype.c
@@ -71,6 +71,7 @@ static const struct datatype *datatypes[TYPE_MAX + 1] = {
[TYPE_BOOLEAN] = &boolean_type,
[TYPE_IFNAME] = &ifname_type,
[TYPE_IGMP_TYPE] = &igmp_type_type,
+ [TYPE_CT_ID] = &ct_id_type,
};
const struct datatype *datatype_lookup(enum datatypes type)
diff --git a/src/parser_bison.y b/src/parser_bison.y
index 4a2a81c..92660ce 100644
--- a/src/parser_bison.y
+++ b/src/parser_bison.y
@@ -4100,6 +4100,7 @@ ct_key : L3PROTOCOL { $$ = NFT_CT_L3PROTOCOL; }
| LABEL { $$ = NFT_CT_LABELS; }
| EVENT { $$ = NFT_CT_EVENTMASK; }
| TIMEOUT { $$ = NFT_CT_TIMEOUT; }
+ | ID { $$ = NFT_CT_ID; }
| ct_key_dir_optional
;
--
2.11.0
