From: Anders K. Pedersen <akp@xxxxxxxxxxxx>
Introduce support for rt expression for routing related data as implemented
in kernel.
Signed-off-by: Anders K. Pedersen <akp@xxxxxxxxxxxx>
---
include/libnftnl/expr.h | 12 ++
include/linux/netfilter/nf_tables.h | 26 ++++
src/Makefile.am | 1 +
src/expr/rt.c | 268 ++++++++++++++++++++++++++++++++++++
src/expr_ops.c | 2 +
5 files changed, 309 insertions(+)
diff --git a/include/libnftnl/expr.h b/include/libnftnl/expr.h
index 4ce2592..e02e5b7 100644
--- a/include/libnftnl/expr.h
+++ b/include/libnftnl/expr.h
@@ -64,6 +64,12 @@ enum {
};
enum {
+ NFTNL_EXPR_RT_KEY = NFTNL_EXPR_BASE,
+ NFTNL_EXPR_RT_DREG,
+ NFTNL_EXPR_RT_FAMILY,
+};
+
+enum {
NFTNL_EXPR_CMP_SREG = NFTNL_EXPR_BASE,
NFTNL_EXPR_CMP_OP,
NFTNL_EXPR_CMP_DATA,
@@ -265,6 +271,12 @@ enum {
};
enum {
+ NFT_EXPR_RT_KEY = NFT_RULE_EXPR_ATTR_BASE,
+ NFT_EXPR_RT_DREG,
+ NFT_EXPR_RT_FAMILY,
+};
+
+enum {
NFT_EXPR_CMP_SREG = NFT_RULE_EXPR_ATTR_BASE,
NFT_EXPR_CMP_OP,
NFT_EXPR_CMP_DATA,
diff --git a/include/linux/netfilter/nf_tables.h b/include/linux/netfilter/nf_tables.h
index 681082e..81ee4f0 100644
--- a/include/linux/netfilter/nf_tables.h
+++ b/include/linux/netfilter/nf_tables.h
@@ -724,6 +724,16 @@ enum nft_meta_keys {
};
/**
+ * enum nft_rt_keys - nf_tables routing expression keys
+ *
+ * @NFT_META_NEXTHOP: routing nexthop
+ */
+enum nft_rt_keys {
+ NFT_RT_CLASSID,
+ NFT_RT_NEXTHOP,
+};
+
+/**
* enum nft_hash_attributes - nf_tables hash expression netlink attributes
*
* @NFTA_HASH_SREG: source register (NLA_U32)
@@ -762,6 +772,22 @@ enum nft_meta_attributes {
#define NFTA_META_MAX (__NFTA_META_MAX - 1)
/**
+ * enum nft_rt_attributes - nf_tables routing expression netlink attributes
+ *
+ * @NFTA_RT_DREG: destination register (NLA_U32)
+ * @NFTA_RT_KEY: meta data item to load (NLA_U32: nft_rt_keys)
+ * @NFTA_RT_FAMILY: Address family (NLA_U32)
+ */
+enum nft_rt_attributes {
+ NFTA_RT_UNSPEC,
+ NFTA_RT_DREG,
+ NFTA_RT_KEY,
+ NFTA_RT_FAMILY,
+ __NFTA_RT_MAX
+};
+#define NFTA_RT_MAX (__NFTA_RT_MAX - 1)
+
+/**
* enum nft_ct_keys - nf_tables ct expression keys
*
* @NFT_CT_STATE: conntrack state (bitmask of enum ip_conntrack_info)
diff --git a/src/Makefile.am b/src/Makefile.am
index 4ab8fca..48ff85a 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -43,6 +43,7 @@ libnftnl_la_SOURCES = utils.c \
expr/queue.c \
expr/quota.c \
expr/reject.c \
+ expr/rt.c \
expr/target.c \
expr/masq.c \
expr/redir.c \
diff --git a/src/expr/rt.c b/src/expr/rt.c
new file mode 100644
index 0000000..fa659e7
--- /dev/null
+++ b/src/expr/rt.c
@@ -0,0 +1,268 @@
+/*
+ * Copyright (c) 2016 Anders K. Pedersen <akp@xxxxxxxxxxxx>
+ *
+ * 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 <string.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <linux/netfilter/nf_tables.h>
+
+#include "internal.h"
+#include <libmnl/libmnl.h>
+#include <libnftnl/expr.h>
+#include <libnftnl/rule.h>
+
+#ifndef NFT_RT_MAX
+#define NFT_RT_MAX (NFT_RT_NEXTHOP + 1)
+#endif
+
+struct nftnl_expr_rt {
+ enum nft_rt_keys key;
+ enum nft_registers dreg;
+ int family;
+};
+
+static int
+nftnl_expr_rt_set(struct nftnl_expr *e, uint16_t type,
+ const void *data, uint32_t data_len)
+{
+ struct nftnl_expr_rt *rt = nftnl_expr_data(e);
+
+ switch (type) {
+ case NFTNL_EXPR_RT_KEY:
+ rt->key = *((uint32_t *)data);
+ break;
+ case NFTNL_EXPR_RT_DREG:
+ rt->dreg = *((uint32_t *)data);
+ break;
+ case NFTNL_EXPR_RT_FAMILY:
+ rt->family = *((uint32_t *)data);
+ break;
+ default:
+ return -1;
+ }
+ return 0;
+}
+
+static const void *
+nftnl_expr_rt_get(const struct nftnl_expr *e, uint16_t type,
+ uint32_t *data_len)
+{
+ struct nftnl_expr_rt *rt = nftnl_expr_data(e);
+
+ switch (type) {
+ case NFTNL_EXPR_RT_KEY:
+ *data_len = sizeof(rt->key);
+ return &rt->key;
+ case NFTNL_EXPR_RT_DREG:
+ *data_len = sizeof(rt->dreg);
+ return &rt->dreg;
+ case NFTNL_EXPR_RT_FAMILY:
+ *data_len = sizeof(rt->family);
+ return &rt->family;
+ }
+ return NULL;
+}
+
+static int nftnl_expr_rt_cb(const struct nlattr *attr, void *data)
+{
+ const struct nlattr **tb = data;
+ int type = mnl_attr_get_type(attr);
+
+ if (mnl_attr_type_valid(attr, NFTA_RT_MAX) < 0)
+ return MNL_CB_OK;
+
+ switch (type) {
+ case NFTA_RT_KEY:
+ case NFTA_RT_DREG:
+ case NFTA_RT_FAMILY:
+ if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+ abi_breakage();
+ break;
+ }
+
+ tb[type] = attr;
+ return MNL_CB_OK;
+}
+
+static void
+nftnl_expr_rt_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
+{
+ struct nftnl_expr_rt *rt = nftnl_expr_data(e);
+
+ if (e->flags & (1 << NFTNL_EXPR_RT_KEY))
+ mnl_attr_put_u32(nlh, NFTA_RT_KEY, htonl(rt->key));
+ if (e->flags & (1 << NFTNL_EXPR_RT_DREG))
+ mnl_attr_put_u32(nlh, NFTA_RT_DREG, htonl(rt->dreg));
+ if (e->flags & (1 << NFTNL_EXPR_RT_FAMILY))
+ mnl_attr_put_u32(nlh, NFTA_RT_FAMILY, htonl(rt->family));
+}
+
+static int
+nftnl_expr_rt_parse(struct nftnl_expr *e, struct nlattr *attr)
+{
+ struct nftnl_expr_rt *rt = nftnl_expr_data(e);
+ struct nlattr *tb[NFTA_RT_MAX+1] = {};
+
+ if (mnl_attr_parse_nested(attr, nftnl_expr_rt_cb, tb) < 0)
+ return -1;
+
+ if (tb[NFTA_RT_KEY]) {
+ rt->key = ntohl(mnl_attr_get_u32(tb[NFTA_RT_KEY]));
+ e->flags |= (1 << NFTNL_EXPR_RT_KEY);
+ }
+ if (tb[NFTA_RT_DREG]) {
+ rt->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_RT_DREG]));
+ e->flags |= (1 << NFTNL_EXPR_RT_DREG);
+ }
+ if (tb[NFTA_RT_FAMILY]) {
+ rt->family = ntohl(mnl_attr_get_u32(tb[NFTA_RT_FAMILY]));
+ e->flags |= (1 << NFTNL_EXPR_RT_FAMILY);
+ }
+
+ return 0;
+}
+
+static const char *rt_key2str_array[NFT_RT_MAX] = {
+ [NFT_RT_CLASSID] = "classid",
+ [NFT_RT_NEXTHOP] = "nexthop",
+};
+
+static const char *rt_key2str(uint8_t key)
+{
+ if (key < NFT_RT_MAX)
+ return rt_key2str_array[key];
+
+ return "unknown";
+}
+
+static inline int str2rt_key(const char *str)
+{
+ int i;
+
+ for (i = 0; i < NFT_RT_MAX; i++) {
+ if (strcmp(str, rt_key2str_array[i]) == 0)
+ return i;
+ }
+
+ errno = EINVAL;
+ return -1;
+}
+
+static int nftnl_expr_rt_json_parse(struct nftnl_expr *e, json_t *root,
+ struct nftnl_parse_err *err)
+{
+#ifdef JSON_PARSING
+ const char *val_str;
+ uint32_t reg;
+ int val32;
+
+ val_str = nftnl_jansson_parse_str(root, "key", err);
+ if (val_str != NULL) {
+ val32 = str2rt_key(val_str);
+ if (val32 >= 0)
+ nftnl_expr_set_u32(e, NFTNL_EXPR_RT_KEY, val32);
+ }
+
+ if (nftnl_jansson_node_exist(root, "dreg")) {
+ if (nftnl_jansson_parse_reg(root, "dreg", NFTNL_TYPE_U32, ®,
+ err) == 0)
+ nftnl_expr_set_u32(e, NFTNL_EXPR_RT_DREG, reg);
+ }
+
+ val_str = nftnl_jansson_parse_str(root, "family", err);
+ if (val_str != NULL) {
+ val32 = nftnl_str2family(val_str);
+ if (val32 >= 0)
+ nftnl_expr_set_u32(e, NFTNL_EXPR_RT_FAMILY, val32);
+ }
+
+ return 0;
+#else
+ errno = EOPNOTSUPP;
+ return -1;
+#endif
+}
+
+static int
+nftnl_expr_rt_snprintf_default(char *buf, size_t len,
+ const struct nftnl_expr *e)
+{
+ struct nftnl_expr_rt *rt = nftnl_expr_data(e);
+
+ if (e->flags & (1 << NFTNL_EXPR_RT_DREG)) {
+ return snprintf(buf, len, "load %s %s => reg %u ",
+ nftnl_family2str(rt->family),
+ rt_key2str(rt->key), rt->dreg);
+ }
+ return 0;
+}
+
+static int nftnl_expr_rt_export(char *buf, size_t size,
+ const struct nftnl_expr *e, int type)
+{
+ struct nftnl_expr_rt *rt = nftnl_expr_data(e);
+ NFTNL_BUF_INIT(b, buf, size);
+
+ if (e->flags & (1 << NFTNL_EXPR_RT_DREG))
+ nftnl_buf_u32(&b, type, rt->dreg, DREG);
+ if (e->flags & (1 << NFTNL_EXPR_RT_KEY))
+ nftnl_buf_str(&b, type, rt_key2str(rt->key), KEY);
+ if (e->flags & (1 << NFTNL_EXPR_RT_FAMILY))
+ nftnl_buf_str(&b, type, nftnl_family2str(rt->family), FAMILY);
+
+ return nftnl_buf_done(&b);
+}
+
+static int
+nftnl_expr_rt_snprintf(char *buf, size_t len, uint32_t type,
+ uint32_t flags, const struct nftnl_expr *e)
+{
+ switch (type) {
+ case NFTNL_OUTPUT_DEFAULT:
+ return nftnl_expr_rt_snprintf_default(buf, len, e);
+ case NFTNL_OUTPUT_XML:
+ case NFTNL_OUTPUT_JSON:
+ return nftnl_expr_rt_export(buf, len, e, type);
+ default:
+ break;
+ }
+ return -1;
+}
+
+static bool nftnl_expr_rt_cmp(const struct nftnl_expr *e1,
+ const struct nftnl_expr *e2)
+{
+ struct nftnl_expr_rt *r1 = nftnl_expr_data(e1);
+ struct nftnl_expr_rt *r2 = nftnl_expr_data(e2);
+ bool eq = true;
+
+ if (e1->flags & (1 << NFTNL_EXPR_RT_KEY))
+ eq &= (r1->key == r2->key);
+ if (e1->flags & (1 << NFTNL_EXPR_RT_DREG))
+ eq &= (r1->dreg == r2->dreg);
+ if (e1->flags & (1 << NFTNL_EXPR_RT_FAMILY))
+ eq &= (r1->family == r2->family);
+
+ return eq;
+}
+
+struct expr_ops expr_ops_rt = {
+ .name = "rt",
+ .alloc_len = sizeof(struct nftnl_expr_rt),
+ .max_attr = NFTA_RT_MAX,
+ .cmp = nftnl_expr_rt_cmp,
+ .set = nftnl_expr_rt_set,
+ .get = nftnl_expr_rt_get,
+ .parse = nftnl_expr_rt_parse,
+ .build = nftnl_expr_rt_build,
+ .snprintf = nftnl_expr_rt_snprintf,
+ .json_parse = nftnl_expr_rt_json_parse,
+};
diff --git a/src/expr_ops.c b/src/expr_ops.c
index 2a047d2..7c0e891 100644
--- a/src/expr_ops.c
+++ b/src/expr_ops.c
@@ -24,6 +24,7 @@ extern struct expr_ops expr_ops_nat;
extern struct expr_ops expr_ops_payload;
extern struct expr_ops expr_ops_redir;
extern struct expr_ops expr_ops_reject;
+extern struct expr_ops expr_ops_rt;
extern struct expr_ops expr_ops_queue;
extern struct expr_ops expr_ops_quota;
extern struct expr_ops expr_ops_target;
@@ -51,6 +52,7 @@ static struct expr_ops *expr_ops[] = {
&expr_ops_payload,
&expr_ops_redir,
&expr_ops_reject,
+ &expr_ops_rt,
&expr_ops_queue,
&expr_ops_quota,
&expr_ops_target,
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