@@ -10,4 +10,5 @@ pkginclude_HEADERS = batch.h \
ruleset.h \
common.h \
udata.h \
- gen.h
+ gen.h \
+ cttimeout.h
new file mode 100644
@@ -0,0 +1,33 @@
+#ifndef _LIBNETFILTER_CTTIMEOUT_H_
+#define _LIBNETFILTER_CTTIMEOUT_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+enum nftnl_cttimeout_tcp {
+ NFTNL_CTTIMEOUT_TCP_SYN_SENT = 0,
+ NFTNL_CTTIMEOUT_TCP_SYN_RECV,
+ NFTNL_CTTIMEOUT_TCP_ESTABLISHED,
+ NFTNL_CTTIMEOUT_TCP_FIN_WAIT,
+ NFTNL_CTTIMEOUT_TCP_CLOSE_WAIT,
+ NFTNL_CTTIMEOUT_TCP_LAST_ACK,
+ NFTNL_CTTIMEOUT_TCP_TIME_WAIT,
+ NFTNL_CTTIMEOUT_TCP_CLOSE,
+ NFTNL_CTTIMEOUT_TCP_SYN_SENT2,
+ NFTNL_CTTIMEOUT_TCP_RETRANS,
+ NFTNL_CTTIMEOUT_TCP_UNACK,
+ NFTNL_CTTIMEOUT_TCP_MAX
+};
+
+enum nftnl_cttimeout_udp {
+ NFTNL_CTTIMEOUT_UDP_UNREPLIED = 0,
+ NFTNL_CTTIMEOUT_UDP_REPLIED,
+ NFTNL_CTTIMEOUT_UDP_MAX
+};
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif
@@ -41,6 +41,12 @@ enum {
NFTNL_OBJ_CT_HELPER_L4PROTO,
};
+enum {
+ NFTNL_OBJ_CT_TIMEOUT_L3PROTO = NFTNL_OBJ_BASE,
+ NFTNL_OBJ_CT_TIMEOUT_L4PROTO,
+ NFTNL_OBJ_CT_TIMEOUT_DATA,
+};
+
enum {
NFTNL_OBJ_LIMIT_RATE = NFTNL_OBJ_BASE,
NFTNL_OBJ_LIMIT_UNIT,
@@ -969,6 +969,7 @@ enum nft_osf_attributes {
* @NFT_CT_DST_IP: conntrack layer 3 protocol destination (IPv4 address)
* @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
*/
enum nft_ct_keys {
NFT_CT_STATE,
@@ -994,6 +995,7 @@ enum nft_ct_keys {
NFT_CT_DST_IP,
NFT_CT_SRC_IP6,
NFT_CT_DST_IP6,
+ NFT_CT_TIMEOUT,
__NFT_CT_MAX
};
#define NFT_CT_MAX (__NFT_CT_MAX - 1)
@@ -1395,6 +1397,15 @@ enum nft_ct_helper_attributes {
};
#define NFTA_CT_HELPER_MAX (__NFTA_CT_HELPER_MAX - 1)
+enum nft_ct_timeout_attributes {
+ NFTA_CT_TIMEOUT_UNSPEC,
+ NFTA_CT_TIMEOUT_L3PROTO,
+ NFTA_CT_TIMEOUT_L4PROTO,
+ NFTA_CT_TIMEOUT_DATA,
+ __NFTA_CT_TIMEOUT_MAX,
+};
+#define NFTA_CT_TIMEOUT_MAX (__NFTA_CT_TIMEOUT_MAX - 1)
+
#define NFT_OBJECT_UNSPEC 0
#define NFT_OBJECT_COUNTER 1
#define NFT_OBJECT_QUOTA 2
@@ -1402,7 +1413,8 @@ enum nft_ct_helper_attributes {
#define NFT_OBJECT_LIMIT 4
#define NFT_OBJECT_CONNLIMIT 5
#define NFT_OBJECT_TUNNEL 6
-#define __NFT_OBJECT_MAX 7
+#define NFT_OBJECT_CT_TIMEOUT 7
+#define __NFT_OBJECT_MAX 8
#define NFT_OBJECT_MAX (__NFT_OBJECT_MAX - 1)
/**
@@ -36,6 +36,11 @@ struct nftnl_obj {
uint8_t l4proto;
char name[16];
} ct_helper;
+ struct nftnl_obj_ct_timeout {
+ uint16_t l3proto;
+ uint8_t l4proto;
+ uint32_t *timeout;
+ } ct_timeout;
struct nftnl_obj_limit {
uint64_t rate;
uint64_t unit;
@@ -91,6 +96,7 @@ struct obj_ops {
extern struct obj_ops obj_ops_counter;
extern struct obj_ops obj_ops_quota;
extern struct obj_ops obj_ops_ct_helper;
+extern struct obj_ops obj_ops_ct_timeout;
extern struct obj_ops obj_ops_limit;
extern struct obj_ops obj_ops_tunnel;
@@ -64,4 +64,5 @@ libnftnl_la_SOURCES = utils.c \
obj/quota.c \
obj/tunnel.c \
obj/limit.c \
+ obj/ct_timeout.c \
libnftnl.map
new file mode 100644
@@ -0,0 +1,368 @@
+/*
+ * (C) 2018 by Harsha Sharma <harshasharmaiitr@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <inttypes.h>
+
+#include <linux/netfilter/nf_tables.h>
+
+#include "internal.h"
+#include <libmnl/libmnl.h>
+#include <libnftnl/object.h>
+#include <libnftnl/cttimeout.h>
+
+#include "obj.h"
+
+static const char *const tcp_state_to_name[] = {
+ [NFTNL_CTTIMEOUT_TCP_SYN_SENT] = "SYN_SENT",
+ [NFTNL_CTTIMEOUT_TCP_SYN_RECV] = "SYN_RECV",
+ [NFTNL_CTTIMEOUT_TCP_ESTABLISHED] = "ESTABLISHED",
+ [NFTNL_CTTIMEOUT_TCP_FIN_WAIT] = "FIN_WAIT",
+ [NFTNL_CTTIMEOUT_TCP_CLOSE_WAIT] = "CLOSE_WAIT",
+ [NFTNL_CTTIMEOUT_TCP_LAST_ACK] = "LAST_ACK",
+ [NFTNL_CTTIMEOUT_TCP_TIME_WAIT] = "TIME_WAIT",
+ [NFTNL_CTTIMEOUT_TCP_CLOSE] = "CLOSE",
+ [NFTNL_CTTIMEOUT_TCP_SYN_SENT2] = "SYN_SENT2",
+ [NFTNL_CTTIMEOUT_TCP_RETRANS] = "RETRANS",
+ [NFTNL_CTTIMEOUT_TCP_UNACK] = "UNACKNOWLEDGED",
+};
+
+static uint32_t tcp_dflt_timeout[] = {
+ [NFTNL_CTTIMEOUT_TCP_SYN_SENT] = 120,
+ [NFTNL_CTTIMEOUT_TCP_SYN_RECV] = 60,
+ [NFTNL_CTTIMEOUT_TCP_ESTABLISHED] = 432000,
+ [NFTNL_CTTIMEOUT_TCP_FIN_WAIT] = 120,
+ [NFTNL_CTTIMEOUT_TCP_CLOSE_WAIT] = 60,
+ [NFTNL_CTTIMEOUT_TCP_LAST_ACK] = 30,
+ [NFTNL_CTTIMEOUT_TCP_TIME_WAIT] = 120,
+ [NFTNL_CTTIMEOUT_TCP_CLOSE] = 10,
+ [NFTNL_CTTIMEOUT_TCP_SYN_SENT2] = 120,
+ [NFTNL_CTTIMEOUT_TCP_RETRANS] = 300,
+ [NFTNL_CTTIMEOUT_TCP_UNACK] = 300,
+};
+
+static const char *const udp_state_to_name[] = {
+ [NFTNL_CTTIMEOUT_UDP_UNREPLIED] = "UNREPLIED",
+ [NFTNL_CTTIMEOUT_UDP_REPLIED] = "REPLIED",
+};
+
+static uint32_t udp_dflt_timeout[] = {
+ [NFTNL_CTTIMEOUT_UDP_UNREPLIED] = 30,
+ [NFTNL_CTTIMEOUT_UDP_REPLIED] = 180,
+};
+
+static struct {
+ uint32_t attr_max;
+ const char *const *state_to_name;
+ uint32_t *dflt_timeout;
+} timeout_protocol[IPPROTO_MAX] = {
+ [IPPROTO_TCP] = {
+ .attr_max = NFTNL_CTTIMEOUT_TCP_MAX,
+ .state_to_name = tcp_state_to_name,
+ .dflt_timeout = tcp_dflt_timeout,
+ },
+ [IPPROTO_UDP] = {
+ .attr_max = NFTNL_CTTIMEOUT_UDP_MAX,
+ .state_to_name = udp_state_to_name,
+ .dflt_timeout = udp_dflt_timeout,
+ },
+};
+
+struct _container_policy_cb {
+ unsigned int nlattr_max;
+ void *tb;
+};
+
+static int
+nftnl_timeout_policy_attr_set_u32(struct nftnl_obj *e,
+ uint32_t type, uint32_t data)
+{
+ struct nftnl_obj_ct_timeout *t = nftnl_obj_data(e);
+ size_t timeout_array_size;
+
+ /* Layer 4 protocol needs to be already set. */
+ if (!(e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_L4PROTO)))
+ return -1;
+ if (t->timeout == NULL) {
+ /* if not supported, default to generic protocol tracker. */
+ if (timeout_protocol[t->l4proto].attr_max != 0) {
+ timeout_array_size = sizeof(uint32_t) *
+ timeout_protocol[t->l4proto].attr_max;
+ } else {
+ timeout_array_size = sizeof(uint32_t) *
+ timeout_protocol[IPPROTO_RAW].attr_max;
+ }
+ t->timeout = calloc(1, timeout_array_size);
+ if (t->timeout == NULL)
+ return -1;
+ }
+
+ /* this state does not exists in this protocol tracker.*/
+ if (type > timeout_protocol[t->l4proto].attr_max)
+ return -1;
+
+ t->timeout[type] = data;
+
+ if (!(e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_DATA)))
+ e->flags |= (1 << NFTNL_OBJ_CT_TIMEOUT_DATA);
+
+ return 0;
+}
+
+static int
+parse_timeout_attr_policy_cb(const struct nlattr *attr, void *data)
+{
+ struct _container_policy_cb *data_cb = data;
+ const struct nlattr **tb = data_cb->tb;
+ uint16_t type = mnl_attr_get_type(attr);
+
+ if (mnl_attr_type_valid(attr, data_cb->nlattr_max) < 0)
+ return MNL_CB_OK;
+
+ if (type <= data_cb->nlattr_max) {
+ if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+ abi_breakage();
+ tb[type] = attr;
+ }
+ return MNL_CB_OK;
+}
+
+static void
+timeout_parse_attr_data(struct nftnl_obj *e,
+ const struct nlattr *nest)
+{
+ struct nftnl_obj_ct_timeout *t = nftnl_obj_data(e);
+ unsigned int attr_max = timeout_protocol[t->l4proto].attr_max;
+ struct nlattr *tb[attr_max];
+ struct _container_policy_cb cnt = {
+ .nlattr_max = attr_max,
+ .tb = tb,
+ };
+ unsigned int i;
+
+ memset(tb, 0, sizeof(struct nlattr *) * attr_max);
+
+ mnl_attr_parse_nested(nest, parse_timeout_attr_policy_cb, &cnt);
+
+ for (i = 1; i <= attr_max; i++) {
+ if (tb[i]) {
+ nftnl_timeout_policy_attr_set_u32(e, i-1,
+ ntohl(mnl_attr_get_u32(tb[i])));
+ }
+ }
+}
+
+static int nftnl_obj_ct_timeout_set(struct nftnl_obj *e, uint16_t type,
+ const void *data, uint32_t data_len)
+{
+ struct nftnl_obj_ct_timeout *timeout = nftnl_obj_data(e);
+
+ switch (type) {
+ case NFTNL_OBJ_CT_TIMEOUT_L3PROTO:
+ timeout->l3proto = *((uint16_t *)data);
+ break;
+ case NFTNL_OBJ_CT_TIMEOUT_L4PROTO:
+ timeout->l4proto = *((uint8_t *)data);
+ break;
+ case NFTNL_OBJ_CT_TIMEOUT_DATA:
+ timeout->timeout = ((uint32_t *)data);
+ break;
+ default:
+ return -1;
+ }
+ return 0;
+}
+
+static const void *nftnl_obj_ct_timeout_get(const struct nftnl_obj *e,
+ uint16_t type, uint32_t *data_len)
+{
+ struct nftnl_obj_ct_timeout *timeout = nftnl_obj_data(e);
+
+ switch (type) {
+ case NFTNL_OBJ_CT_TIMEOUT_L3PROTO:
+ *data_len = sizeof(timeout->l3proto);
+ return &timeout->l3proto;
+ case NFTNL_OBJ_CT_TIMEOUT_L4PROTO:
+ *data_len = sizeof(timeout->l4proto);
+ return &timeout->l4proto;
+ case NFTNL_OBJ_CT_TIMEOUT_DATA:
+ *data_len = sizeof(timeout->timeout);
+ return timeout->timeout;
+ }
+ return NULL;
+}
+
+static int nftnl_obj_ct_timeout_cb(const struct nlattr *attr, void *data)
+{
+ int type = mnl_attr_get_type(attr);
+ const struct nlattr **tb = data;
+
+ if (mnl_attr_type_valid(attr, NFTA_CT_TIMEOUT_MAX) < 0)
+ return MNL_CB_OK;
+
+ switch (type) {
+ case NFTA_CT_TIMEOUT_L3PROTO:
+ if (mnl_attr_validate(attr, MNL_TYPE_U16) < 0)
+ abi_breakage();
+ break;
+ case NFTA_CT_TIMEOUT_L4PROTO:
+ if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
+ abi_breakage();
+ break;
+ case NFTA_CT_TIMEOUT_DATA:
+ if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
+ abi_breakage();
+ break;
+ }
+
+ tb[type] = attr;
+ return MNL_CB_OK;
+}
+
+static void
+nftnl_obj_ct_timeout_build(struct nlmsghdr *nlh, const struct nftnl_obj *e)
+{
+ struct nftnl_obj_ct_timeout *timeout = nftnl_obj_data(e);
+ struct nlattr *nest;
+
+ if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_L3PROTO))
+ mnl_attr_put_u16(nlh, NFTA_CT_TIMEOUT_L3PROTO, htons(timeout->l3proto));
+ if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_L4PROTO))
+ mnl_attr_put_u8(nlh, NFTA_CT_TIMEOUT_L4PROTO, timeout->l4proto);
+ if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_DATA)) {
+ nest = mnl_attr_nest_start(nlh, NFTA_CT_TIMEOUT_DATA);
+ for (int i = 0; i < timeout_protocol[timeout->l4proto].attr_max; i++) {
+ if (timeout->timeout[i])
+ mnl_attr_put_u32(nlh, i+1, htonl(timeout->timeout[i]));
+ }
+ mnl_attr_nest_end(nlh, nest);
+ }
+}
+
+static int
+nftnl_obj_ct_timeout_parse(struct nftnl_obj *e, struct nlattr *attr)
+{
+ struct nftnl_obj_ct_timeout *timeout = nftnl_obj_data(e);
+ struct nlattr *tb[NFTA_CT_TIMEOUT_MAX + 1] = {};
+
+ if (mnl_attr_parse_nested(attr, nftnl_obj_ct_timeout_cb, tb) < 0)
+ return -1;
+
+ if (tb[NFTA_CT_TIMEOUT_L3PROTO]) {
+ timeout->l3proto = ntohs(mnl_attr_get_u16(tb[NFTA_CT_TIMEOUT_L3PROTO]));
+ e->flags |= (1 << NFTNL_OBJ_CT_TIMEOUT_L3PROTO);
+ }
+ if (tb[NFTA_CT_TIMEOUT_L4PROTO]) {
+ timeout->l4proto = mnl_attr_get_u8(tb[NFTA_CT_TIMEOUT_L4PROTO]);
+ e->flags |= (1 << NFTNL_OBJ_CT_TIMEOUT_L4PROTO);
+ }
+ if (tb[NFTA_CT_TIMEOUT_DATA]) {
+ timeout_parse_attr_data(e, tb[NFTA_CT_TIMEOUT_DATA]);
+ e->flags |= (1 << NFTNL_OBJ_CT_TIMEOUT_DATA);
+ }
+ return 0;
+}
+
+static int nftnl_obj_ct_timeout_export(char *buf, size_t size,
+ const struct nftnl_obj *e, int type)
+{
+ struct nftnl_obj_ct_timeout *timeout = nftnl_obj_data(e);
+
+ NFTNL_BUF_INIT(b, buf, size);
+
+ if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_L3PROTO))
+ nftnl_buf_u32(&b, type, timeout->l3proto, FAMILY);
+ if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_L4PROTO))
+ nftnl_buf_u32(&b, type, timeout->l4proto, "service");
+
+ return nftnl_buf_done(&b);
+}
+
+static int nftnl_obj_ct_timeout_snprintf_default(char *buf, size_t len,
+ const struct nftnl_obj *e)
+{
+ int ret = 0;
+ int offset = 0, remain = len;
+
+ struct nftnl_obj_ct_timeout *timeout = nftnl_obj_data(e);
+
+ if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_L3PROTO)) {
+ ret = snprintf(buf + offset, len, "family %d ",
+ timeout->l3proto);
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+ }
+ if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_L4PROTO)) {
+ ret = snprintf(buf + offset, len, "protocol %d ",
+ timeout->l4proto);
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+ }
+ if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_DATA)) {
+ uint8_t l4num = timeout->l4proto;
+ int i;
+
+ /* default to generic protocol tracker. */
+ if (timeout_protocol[timeout->l4proto].attr_max == 0)
+ l4num = IPPROTO_RAW;
+
+ ret = snprintf(buf + offset, len, "policy = {");
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+
+ for (i = 0; i < timeout_protocol[l4num].attr_max; i++) {
+ const char *state_name =
+ timeout_protocol[l4num].state_to_name[i][0] ?
+ timeout_protocol[l4num].state_to_name[i] :
+ "UNKNOWN";
+
+ if (timeout->timeout[i] != timeout_protocol[l4num].dflt_timeout[i]) {
+ ret = snprintf(buf + offset, len,
+ "%s = %u,", state_name, timeout->timeout[i]);
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+ }
+ }
+
+ ret = snprintf(buf + offset, len, "}");
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+ }
+ buf[offset] = '\0';
+
+ return offset;
+}
+
+static int nftnl_obj_ct_timeout_snprintf(char *buf, size_t len, uint32_t type,
+ uint32_t flags,
+ const struct nftnl_obj *e)
+{
+ if (len)
+ buf[0] = '\0';
+
+ switch (type) {
+ case NFTNL_OUTPUT_DEFAULT:
+ return nftnl_obj_ct_timeout_snprintf_default(buf, len, e);
+ case NFTNL_OUTPUT_JSON:
+ return nftnl_obj_ct_timeout_export(buf, len, e, type);
+ default:
+ break;
+ }
+ return -1;
+}
+
+struct obj_ops obj_ops_ct_timeout = {
+ .name = "ct_timeout",
+ .type = NFT_OBJECT_CT_TIMEOUT,
+ .alloc_len = sizeof(struct nftnl_obj_ct_timeout),
+ .max_attr = NFTA_CT_TIMEOUT_MAX,
+ .set = nftnl_obj_ct_timeout_set,
+ .get = nftnl_obj_ct_timeout_get,
+ .parse = nftnl_obj_ct_timeout_parse,
+ .build = nftnl_obj_ct_timeout_build,
+ .snprintf = nftnl_obj_ct_timeout_snprintf,
+};
@@ -31,6 +31,7 @@ static struct obj_ops *obj_ops[] = {
[NFT_OBJECT_CT_HELPER] = &obj_ops_ct_helper,
[NFT_OBJECT_LIMIT] = &obj_ops_limit,
[NFT_OBJECT_TUNNEL] = &obj_ops_tunnel,
+ [NFT_OBJECT_CT_TIMEOUT] = &obj_ops_ct_timeout,
};
static struct obj_ops *nftnl_obj_ops_lookup(uint32_t type)
Add support for ct timeout objects, used to assign connection tracking timeout policies. Signed-off-by: Harsha Sharma <harshasharmaiitr@gmail.com> --- Changes in v6: - Remove includes from header file which are not required - other minor changes Changes in v5: - Remove nftnl_timeout_policy_attr_set_u32 - remove NFTNL_OBJ_CT_TIMEOUT_POLICY - remove nftnl_obj_get_void - minor changes Changes in v4: - updated include/linux/netfilter/nf_tables.h Changes in v3: - minor changes updated with nft patch Changes in v2: - minor changes include/libnftnl/Makefile.am | 3 +- include/libnftnl/cttimeout.h | 33 ++++ include/libnftnl/object.h | 6 + include/linux/netfilter/nf_tables.h | 14 +- include/obj.h | 6 + src/Makefile.am | 1 + src/obj/ct_timeout.c | 368 ++++++++++++++++++++++++++++++++++++ src/object.c | 1 + 8 files changed, 430 insertions(+), 2 deletions(-) create mode 100644 include/libnftnl/cttimeout.h create mode 100644 src/obj/ct_timeout.c