add support for ct helper objects, these are used to assign helpers to
connections, similar to iptables -j CT --set-helper target.
Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
---
include/libnftnl/object.h | 6 ++
include/linux/netfilter/nf_tables.h | 12 ++-
include/obj.h | 6 ++
src/Makefile.am | 1 +
src/obj/ct_helper.c | 210 ++++++++++++++++++++++++++++++++++++
src/object.c | 3 +-
6 files changed, 236 insertions(+), 2 deletions(-)
create mode 100644 src/obj/ct_helper.c
diff --git a/include/libnftnl/object.h b/include/libnftnl/object.h
index ca3abeae66cc..ccd9d19b9364 100644
--- a/include/libnftnl/object.h
+++ b/include/libnftnl/object.h
@@ -34,6 +34,12 @@ enum {
NFTNL_OBJ_QUOTA_FLAGS,
};
+enum {
+ NFTNL_OBJ_CT_HELPER_NAME = NFTNL_OBJ_BASE,
+ NFTNL_OBJ_CT_HELPER_L3PROTO,
+ NFTNL_OBJ_CT_HELPER_L4PROTO,
+};
+
struct nftnl_obj;
struct nftnl_obj *nftnl_obj_alloc(void);
diff --git a/include/linux/netfilter/nf_tables.h b/include/linux/netfilter/nf_tables.h
index 05215d30fe5c..121e79cacc49 100644
--- a/include/linux/netfilter/nf_tables.h
+++ b/include/linux/netfilter/nf_tables.h
@@ -1246,10 +1246,20 @@ enum nft_fib_flags {
NFTA_FIB_F_OIF = 1 << 4, /* restrict to oif */
};
+enum nft_ct_helper_attributes {
+ NFTA_CT_HELPER_UNSPEC,
+ NFTA_CT_HELPER_NAME,
+ NFTA_CT_HELPER_L3PROTO,
+ NFTA_CT_HELPER_L4PROTO,
+ __NFTA_CT_HELPER_MAX,
+};
+#define NFTA_CT_HELPER_MAX (__NFTA_CT_HELPER_MAX - 1)
+
#define NFT_OBJECT_UNSPEC 0
#define NFT_OBJECT_COUNTER 1
#define NFT_OBJECT_QUOTA 2
-#define __NFT_OBJECT_MAX 3
+#define NFT_OBJECT_CT_HELPER 3
+#define __NFT_OBJECT_MAX 4
#define NFT_OBJECT_MAX (__NFT_OBJECT_MAX - 1)
/**
diff --git a/include/obj.h b/include/obj.h
index edbf023f5cdd..d90919f2d86b 100644
--- a/include/obj.h
+++ b/include/obj.h
@@ -30,6 +30,11 @@ struct nftnl_obj {
uint64_t consumed;
uint32_t flags;
} quota;
+ struct nftnl_obj_ct_helper {
+ uint16_t l3proto;
+ uint8_t l4proto;
+ char name[16];
+ } ct_helper;
} data;
};
@@ -49,6 +54,7 @@ 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;
#define nftnl_obj_data(obj) (void *)&obj->data
diff --git a/src/Makefile.am b/src/Makefile.am
index 485a8c4acbef..77b67b267672 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -53,5 +53,6 @@ libnftnl_la_SOURCES = utils.c \
expr/redir.c \
expr/hash.c \
obj/counter.c \
+ obj/ct_helper.c \
obj/quota.c \
libnftnl.map
diff --git a/src/obj/ct_helper.c b/src/obj/ct_helper.c
new file mode 100644
index 000000000000..d6d3111ecce8
--- /dev/null
+++ b/src/obj/ct_helper.c
@@ -0,0 +1,210 @@
+/*
+ * (C) 2017 Red Hat GmbH
+ * Author: Florian Westphal <fw@xxxxxxxxx>
+ *
+ * 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 "obj.h"
+
+static int nftnl_obj_ct_helper_set(struct nftnl_obj *e, uint16_t type,
+ const void *data, uint32_t data_len)
+{
+ struct nftnl_obj_ct_helper *helper = nftnl_obj_data(e);
+
+ switch (type) {
+ case NFTNL_OBJ_CT_HELPER_NAME:
+ snprintf(helper->name, sizeof(helper->name), "%s", (const char *)data);
+ break;
+ case NFTNL_OBJ_CT_HELPER_L3PROTO:
+ helper->l3proto = *((uint16_t *)data);
+ break;
+ case NFTNL_OBJ_CT_HELPER_L4PROTO:
+ helper->l4proto = *((uint8_t *)data);
+ break;
+ default:
+ return -1;
+ }
+ return 0;
+}
+
+static const void *nftnl_obj_ct_helper_get(const struct nftnl_obj *e,
+ uint16_t type, uint32_t *data_len)
+{
+ struct nftnl_obj_ct_helper *helper = nftnl_obj_data(e);
+
+ switch (type) {
+ case NFTNL_OBJ_CT_HELPER_NAME:
+ *data_len = strlen(helper->name);
+ return helper->name;
+ case NFTNL_OBJ_CT_HELPER_L3PROTO:
+ *data_len = sizeof(helper->l3proto);
+ return &helper->l3proto;
+ case NFTNL_OBJ_CT_HELPER_L4PROTO:
+ *data_len = sizeof(helper->l4proto);
+ return &helper->l4proto;
+ }
+ return NULL;
+}
+
+static int nftnl_obj_ct_helper_cb(const struct nlattr *attr, void *data)
+{
+ const struct nftnl_obj_ct_helper *helper = NULL;
+ int type = mnl_attr_get_type(attr);
+ const struct nlattr **tb = data;
+
+ if (mnl_attr_type_valid(attr, NFTA_CT_HELPER_MAX) < 0)
+ return MNL_CB_OK;
+
+ switch (type) {
+ case NFTA_CT_HELPER_NAME:
+ if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
+ abi_breakage();
+ if (mnl_attr_get_payload_len(attr) >= sizeof(helper->name))
+ abi_breakage();
+ break;
+ case NFTA_CT_HELPER_L3PROTO:
+ if (mnl_attr_validate(attr, MNL_TYPE_U16) < 0)
+ abi_breakage();
+ break;
+ case NFTA_CT_HELPER_L4PROTO:
+ if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
+ abi_breakage();
+ break;
+ }
+
+ tb[type] = attr;
+ return MNL_CB_OK;
+}
+
+static void
+nftnl_obj_ct_helper_build(struct nlmsghdr *nlh, const struct nftnl_obj *e)
+{
+ struct nftnl_obj_ct_helper *helper = nftnl_obj_data(e);
+
+ if (e->flags & (1 << NFTNL_OBJ_CT_HELPER_NAME))
+ mnl_attr_put_str(nlh, NFTA_CT_HELPER_NAME, helper->name);
+ if (e->flags & (1 << NFTNL_OBJ_CT_HELPER_L3PROTO))
+ mnl_attr_put_u16(nlh, NFTA_CT_HELPER_L3PROTO, htons(helper->l3proto));
+ if (e->flags & (1 << NFTNL_OBJ_CT_HELPER_L4PROTO))
+ mnl_attr_put_u8(nlh, NFTA_CT_HELPER_L4PROTO, helper->l4proto);
+}
+
+static int
+nftnl_obj_ct_helper_parse(struct nftnl_obj *e, struct nlattr *attr)
+{
+ struct nftnl_obj_ct_helper *helper = nftnl_obj_data(e);
+ struct nlattr *tb[NFTA_CT_HELPER_MAX + 1] = {};
+
+ if (mnl_attr_parse_nested(attr, nftnl_obj_ct_helper_cb, tb) < 0)
+ return -1;
+
+ if (tb[NFTA_CT_HELPER_NAME]) {
+ snprintf(helper->name, sizeof(helper->name), "%s",
+ mnl_attr_get_str(tb[NFTA_CT_HELPER_NAME]));
+ e->flags |= (1 << NFTNL_OBJ_CT_HELPER_NAME);
+ }
+ if (tb[NFTA_CT_HELPER_L3PROTO]) {
+ helper->l3proto = ntohs(mnl_attr_get_u16(tb[NFTA_CT_HELPER_L3PROTO]));
+ e->flags |= (1 << NFTNL_OBJ_CT_HELPER_L3PROTO);
+ }
+ if (tb[NFTA_CT_HELPER_L4PROTO]) {
+ helper->l4proto = mnl_attr_get_u8(tb[NFTA_CT_HELPER_L4PROTO]);
+ e->flags |= (1 << NFTNL_OBJ_CT_HELPER_L4PROTO);
+ }
+
+ return 0;
+}
+
+static int
+nftnl_obj_quota_json_parse(struct nftnl_obj *e, json_t *root,
+ struct nftnl_parse_err *err)
+{
+#ifdef JSON_PARSING
+ uint64_t bytes;
+ uint32_t flags;
+
+ if (nftnl_jansson_parse_val(root, "bytes", NFTNL_TYPE_U64, &bytes,
+ err) == 0)
+ nftnl_obj_set_u64(e, NFTNL_OBJ_QUOTA_BYTES, bytes);
+ if (nftnl_jansson_parse_val(root, "consumed", NFTNL_TYPE_U64, &bytes,
+ err) == 0)
+ nftnl_obj_set_u64(e, NFTNL_OBJ_QUOTA_CONSUMED, bytes);
+ if (nftnl_jansson_parse_val(root, "flags", NFTNL_TYPE_U32, &flags,
+ err) == 0)
+ nftnl_obj_set_u32(e, NFTNL_OBJ_QUOTA_FLAGS, flags);
+
+ return 0;
+#else
+ errno = EOPNOTSUPP;
+ return -1;
+#endif
+}
+
+static int nftnl_obj_ct_helper_export(char *buf, size_t size,
+ const struct nftnl_obj *e, int type)
+{
+ struct nftnl_obj_ct_helper *helper = nftnl_obj_data(e);
+ NFTNL_BUF_INIT(b, buf, size);
+
+ if (e->flags & (1 << NFTNL_OBJ_CT_HELPER_NAME))
+ nftnl_buf_str(&b, type, helper->name, NAME);
+ if (e->flags & (1 << NFTNL_OBJ_CT_HELPER_L3PROTO))
+ nftnl_buf_u32(&b, type, helper->l3proto, FAMILY);
+ if (e->flags & (1 << NFTNL_OBJ_CT_HELPER_L4PROTO))
+ nftnl_buf_u32(&b, type, helper->l4proto, "service");
+
+ return nftnl_buf_done(&b);
+}
+
+static int nftnl_obj_ct_helper_snprintf_default(char *buf, size_t len,
+ const struct nftnl_obj *e)
+{
+ struct nftnl_obj_ct_helper *helper = nftnl_obj_data(e);
+
+ return snprintf(buf, len, "name %s family %d protocol %d ",
+ helper->name, helper->l3proto, helper->l4proto);
+}
+
+static int nftnl_obj_ct_helper_snprintf(char *buf, size_t len, uint32_t type,
+ uint32_t flags,
+ const struct nftnl_obj *e)
+{
+ switch (type) {
+ case NFTNL_OUTPUT_DEFAULT:
+ return nftnl_obj_ct_helper_snprintf_default(buf, len, e);
+ case NFTNL_OUTPUT_JSON:
+ return nftnl_obj_ct_helper_export(buf, len, e, type);
+ default:
+ break;
+ }
+ return -1;
+}
+
+struct obj_ops obj_ops_ct_helper = {
+ .name = "ct_helper",
+ .type = NFT_OBJECT_CT_HELPER,
+ .alloc_len = sizeof(struct nftnl_obj_ct_helper),
+ .max_attr = NFTA_CT_HELPER_MAX,
+ .set = nftnl_obj_ct_helper_set,
+ .get = nftnl_obj_ct_helper_get,
+ .parse = nftnl_obj_ct_helper_parse,
+ .build = nftnl_obj_ct_helper_build,
+ .snprintf = nftnl_obj_ct_helper_snprintf,
+ .json_parse = nftnl_obj_quota_json_parse,
+};
diff --git a/src/object.c b/src/object.c
index e635f6a8ff0e..e1a5ac4757b6 100644
--- a/src/object.c
+++ b/src/object.c
@@ -28,11 +28,12 @@
static struct obj_ops *obj_ops[] = {
[NFT_OBJECT_COUNTER] = &obj_ops_counter,
[NFT_OBJECT_QUOTA] = &obj_ops_quota,
+ [NFT_OBJECT_CT_HELPER] = &obj_ops_ct_helper,
};
static struct obj_ops *nftnl_obj_ops_lookup(uint32_t type)
{
- if (type > NFT_OBJECT_QUOTA)
+ if (type > NFT_OBJECT_CT_HELPER)
return NULL;
return obj_ops[type];
--
2.10.2
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