260 lines
6.3 KiB
Diff
260 lines
6.3 KiB
Diff
From: Pablo Neira Ayuso <pablo@netfilter.org>
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Date: Sun, 3 Dec 2017 21:05:54 +0100
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Subject: [PATCH] expr: add flow offload expression
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This patch adds the new "flow_offload" expression to select what flows
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are offloaded to an existing flowtable.
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Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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---
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create mode 100644 src/expr/flow_offload.c
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--- a/include/libnftnl/expr.h
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+++ b/include/libnftnl/expr.h
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@@ -221,6 +221,10 @@ enum {
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};
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enum {
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+ NFTNL_EXPR_FLOW_TABLE_NAME = NFTNL_EXPR_BASE,
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+};
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+
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+enum {
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NFTNL_EXPR_FWD_SREG_DEV = NFTNL_EXPR_BASE,
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};
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--- a/include/linux/netfilter/nf_tables.h
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+++ b/include/linux/netfilter/nf_tables.h
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@@ -952,6 +952,17 @@ enum nft_ct_attributes {
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};
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#define NFTA_CT_MAX (__NFTA_CT_MAX - 1)
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+/**
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+ * enum nft_flow_attributes - ct offload expression attributes
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+ * @NFTA_FLOW_TABLE_NAME: flow table name (NLA_STRING)
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+ */
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+enum nft_offload_attributes {
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+ NFTA_FLOW_UNSPEC,
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+ NFTA_FLOW_TABLE_NAME,
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+ __NFTA_FLOW_MAX,
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+};
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+#define NFTA_FLOW_MAX (__NFTA_FLOW_MAX - 1)
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+
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enum nft_limit_type {
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NFT_LIMIT_PKTS,
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NFT_LIMIT_PKT_BYTES
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--- a/src/Makefile.am
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+++ b/src/Makefile.am
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@@ -32,6 +32,7 @@ libnftnl_la_SOURCES = utils.c \
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expr/data_reg.c \
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expr/dup.c \
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expr/exthdr.c \
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+ expr/flow_offload.c \
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expr/fib.c \
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expr/fwd.c \
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expr/limit.c \
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--- /dev/null
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+++ b/src/expr/flow_offload.c
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@@ -0,0 +1,184 @@
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+#include "internal.h"
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+
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+#include <stdio.h>
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+#include <stdint.h>
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+#include <string.h> /* for memcpy */
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+#include <arpa/inet.h>
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+#include <errno.h>
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+#include <libmnl/libmnl.h>
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+#include <linux/netfilter/nf_tables.h>
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+#include <libnftnl/rule.h>
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+#include <libnftnl/expr.h>
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+
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+struct nftnl_expr_flow {
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+ char *table_name;
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+};
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+
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+static int nftnl_expr_flow_set(struct nftnl_expr *e, uint16_t type,
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+ const void *data, uint32_t data_len)
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+{
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+ struct nftnl_expr_flow *flow = nftnl_expr_data(e);
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+
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+ switch (type) {
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+ case NFTNL_EXPR_FLOW_TABLE_NAME:
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+ flow->table_name = strdup((const char *)data);
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+ if (!flow->table_name)
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+ return -1;
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+ break;
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+ default:
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+ return -1;
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+ }
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+ return 0;
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+}
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+
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+static const void *nftnl_expr_flow_get(const struct nftnl_expr *e,
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+ uint16_t type, uint32_t *data_len)
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+{
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+ struct nftnl_expr_flow *flow = nftnl_expr_data(e);
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+
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+ switch(type) {
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+ case NFTNL_EXPR_FLOW_TABLE_NAME:
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+ *data_len = strlen(flow->table_name) + 1;
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+ return flow->table_name;
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+ }
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+ return NULL;
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+}
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+
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+static int nftnl_expr_flow_cb(const struct nlattr *attr, void *data)
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+{
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+ const struct nlattr **tb = data;
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+ int type = mnl_attr_get_type(attr);
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+
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+ if (mnl_attr_type_valid(attr, NFTA_FLOW_MAX) < 0)
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+ return MNL_CB_OK;
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+
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+ switch(type) {
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+ case NFTA_FLOW_TABLE_NAME:
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+ if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
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+ abi_breakage();
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+ break;
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+ }
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+
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+ tb[type] = attr;
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+ return MNL_CB_OK;
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+}
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+
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+static void nftnl_expr_flow_build(struct nlmsghdr *nlh,
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+ const struct nftnl_expr *e)
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+{
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+ struct nftnl_expr_flow *flow = nftnl_expr_data(e);
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+
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+ if (e->flags & (1 << NFTNL_EXPR_FLOW_TABLE_NAME))
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+ mnl_attr_put_strz(nlh, NFTA_FLOW_TABLE_NAME, flow->table_name);
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+}
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+
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+static int nftnl_expr_flow_parse(struct nftnl_expr *e, struct nlattr *attr)
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+{
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+ struct nftnl_expr_flow *flow = nftnl_expr_data(e);
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+ struct nlattr *tb[NFTA_FLOW_MAX+1] = {};
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+ int ret = 0;
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+
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+ if (mnl_attr_parse_nested(attr, nftnl_expr_flow_cb, tb) < 0)
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+ return -1;
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+
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+ if (tb[NFTA_FLOW_TABLE_NAME]) {
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+ flow->table_name =
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+ strdup(mnl_attr_get_str(tb[NFTA_FLOW_TABLE_NAME]));
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+ if (!flow->table_name)
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+ return -1;
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+ e->flags |= (1 << NFTNL_EXPR_FLOW_TABLE_NAME);
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+ }
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+
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+ return ret;
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+}
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+
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+static int
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+nftnl_expr_flow_json_parse(struct nftnl_expr *e, json_t *root,
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+ struct nftnl_parse_err *err)
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+{
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+#ifdef JSON_PARSING
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+ const char *table_name;
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+
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+ table_name = nftnl_jansson_parse_str(root, "flowtable", err);
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+ if (table_name != NULL)
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+ nftnl_expr_set_str(e, NFTNL_EXPR_FLOW_TABLE_NAME, table_name);
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+
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+ return 0;
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+#else
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+ errno = EOPNOTSUPP;
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+ return -1;
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+#endif
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+}
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+
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+static int nftnl_expr_flow_export(char *buf, size_t size,
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+ const struct nftnl_expr *e, int type)
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+{
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+ struct nftnl_expr_flow *l = nftnl_expr_data(e);
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+ NFTNL_BUF_INIT(b, buf, size);
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+
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+ if (e->flags & (1 << NFTNL_EXPR_FLOW_TABLE_NAME))
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+ nftnl_buf_str(&b, type, l->table_name, SET);
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+
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+ return nftnl_buf_done(&b);
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+}
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+
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+static int nftnl_expr_flow_snprintf_default(char *buf, size_t size,
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+ const struct nftnl_expr *e)
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+{
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+ int remain = size, offset = 0, ret;
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+ struct nftnl_expr_flow *l = nftnl_expr_data(e);
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+
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+ ret = snprintf(buf, remain, "flowtable %s ", l->table_name);
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+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
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+
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+ return offset;
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+}
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+
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+static int nftnl_expr_flow_snprintf(char *buf, size_t size, uint32_t type,
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+ uint32_t flags, const struct nftnl_expr *e)
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+{
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+ switch(type) {
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+ case NFTNL_OUTPUT_DEFAULT:
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+ return nftnl_expr_flow_snprintf_default(buf, size, e);
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+ case NFTNL_OUTPUT_XML:
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+ case NFTNL_OUTPUT_JSON:
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+ return nftnl_expr_flow_export(buf, size, e, type);
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+ default:
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+ break;
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+ }
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+ return -1;
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+}
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+
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+static void nftnl_expr_flow_free(const struct nftnl_expr *e)
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+{
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+ struct nftnl_expr_flow *flow = nftnl_expr_data(e);
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+
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+ xfree(flow->table_name);
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+}
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+
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+static bool nftnl_expr_flow_cmp(const struct nftnl_expr *e1,
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+ const struct nftnl_expr *e2)
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+{
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+ struct nftnl_expr_flow *l1 = nftnl_expr_data(e1);
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+ struct nftnl_expr_flow *l2 = nftnl_expr_data(e2);
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+ bool eq = true;
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+
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+ if (e1->flags & (1 << NFTNL_EXPR_FLOW_TABLE_NAME))
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+ eq &= !strcmp(l1->table_name, l2->table_name);
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+
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+ return eq;
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+}
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+
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+struct expr_ops expr_ops_flow = {
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+ .name = "flow_offload",
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+ .alloc_len = sizeof(struct nftnl_expr_flow),
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+ .max_attr = NFTA_FLOW_MAX,
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+ .free = nftnl_expr_flow_free,
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+ .cmp = nftnl_expr_flow_cmp,
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+ .set = nftnl_expr_flow_set,
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+ .get = nftnl_expr_flow_get,
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+ .parse = nftnl_expr_flow_parse,
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+ .build = nftnl_expr_flow_build,
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+ .snprintf = nftnl_expr_flow_snprintf,
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+ .json_parse = nftnl_expr_flow_json_parse,
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+};
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--- a/src/expr_ops.c
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+++ b/src/expr_ops.c
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@@ -33,6 +33,7 @@ extern struct expr_ops expr_ops_target;
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extern struct expr_ops expr_ops_dynset;
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extern struct expr_ops expr_ops_hash;
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extern struct expr_ops expr_ops_fib;
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+extern struct expr_ops expr_ops_flow;
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static struct expr_ops expr_ops_notrack = {
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.name = "notrack",
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@@ -69,6 +70,7 @@ static struct expr_ops *expr_ops[] = {
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&expr_ops_hash,
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&expr_ops_fib,
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&expr_ops_objref,
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+ &expr_ops_flow,
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NULL,
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};
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