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From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Sun, 3 Dec 2017 21:27:03 +0100
Subject: [PATCH] src: flow offload support
This patch allows us to refer to existing flowtables:
# nft add rule x x flow offload @m
Packets matching this rule create an entry in the flow table 'm', hence,
follow up packets that get to the flowtable at ingress bypass the
classic forwarding path.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
--- a/include/ct.h
+++ b/include/ct.h
@@ -29,6 +29,8 @@ extern struct expr *ct_expr_alloc(const
extern void ct_expr_update_type(struct proto_ctx *ctx, struct expr *expr);
extern struct stmt *notrack_stmt_alloc(const struct location *loc);
+extern struct stmt *flow_offload_stmt_alloc(const struct location *loc,
+ const char *table_name);
extern const struct datatype ct_dir_type;
extern const struct datatype ct_state_type;
--- a/include/statement.h
+++ b/include/statement.h
@@ -10,6 +10,12 @@ extern struct stmt *expr_stmt_alloc(cons
extern struct stmt *verdict_stmt_alloc(const struct location *loc,
struct expr *expr);
+struct flow_stmt {
+ const char *table_name;
+};
+
+struct stmt *flow_stmt_alloc(const struct location *loc, const char *name);
+
struct objref_stmt {
uint32_t type;
struct expr *expr;
@@ -231,6 +237,7 @@ extern struct stmt *xt_stmt_alloc(const
* @STMT_NOTRACK: notrack statement
* @STMT_OBJREF: stateful object reference statement
* @STMT_EXTHDR: extension header statement
+ * @STMT_FLOW_OFFLOAD: flow offload statement
*/
enum stmt_types {
STMT_INVALID,
@@ -256,6 +263,7 @@ enum stmt_types {
STMT_NOTRACK,
STMT_OBJREF,
STMT_EXTHDR,
+ STMT_FLOW_OFFLOAD,
};
/**
@@ -316,6 +324,7 @@ struct stmt {
struct fwd_stmt fwd;
struct xt_stmt xt;
struct objref_stmt objref;
+ struct flow_stmt flow;
};
};
--- a/src/ct.c
+++ b/src/ct.c
@@ -456,3 +456,26 @@ struct stmt *notrack_stmt_alloc(const st
{
return stmt_alloc(loc, ¬rack_stmt_ops);
}
+
+static void flow_offload_stmt_print(const struct stmt *stmt,
+ struct output_ctx *octx)
+{
+ printf("flow offload @%s", stmt->flow.table_name);
+}
+
+static const struct stmt_ops flow_offload_stmt_ops = {
+ .type = STMT_FLOW_OFFLOAD,
+ .name = "flow_offload",
+ .print = flow_offload_stmt_print,
+};
+
+struct stmt *flow_offload_stmt_alloc(const struct location *loc,
+ const char *table_name)
+{
+ struct stmt *stmt;
+
+ stmt = stmt_alloc(loc, &flow_offload_stmt_ops);
+ stmt->flow.table_name = table_name;
+
+ return stmt;
+}
--- a/src/evaluate.c
+++ b/src/evaluate.c
@@ -2773,6 +2773,7 @@ int stmt_evaluate(struct eval_ctx *ctx,
case STMT_LIMIT:
case STMT_QUOTA:
case STMT_NOTRACK:
+ case STMT_FLOW_OFFLOAD:
return 0;
case STMT_EXPRESSION:
return stmt_evaluate_expr(ctx, stmt);
--- a/src/netlink_delinearize.c
+++ b/src/netlink_delinearize.c
@@ -680,6 +680,16 @@ static void netlink_parse_notrack(struct
ctx->stmt = notrack_stmt_alloc(loc);
}
+static void netlink_parse_flow_offload(struct netlink_parse_ctx *ctx,
+ const struct location *loc,
+ const struct nftnl_expr *nle)
+{
+ const char *table_name;
+
+ table_name = xstrdup(nftnl_expr_get_str(nle, NFTNL_EXPR_FLOW_TABLE_NAME));
+ ctx->stmt = flow_offload_stmt_alloc(loc, table_name);
+}
+
static void netlink_parse_ct_stmt(struct netlink_parse_ctx *ctx,
const struct location *loc,
const struct nftnl_expr *nle)
@@ -1255,6 +1265,7 @@ static const struct {
{ .name = "hash", .parse = netlink_parse_hash },
{ .name = "fib", .parse = netlink_parse_fib },
{ .name = "tcpopt", .parse = netlink_parse_exthdr },
+ { .name = "flow_offload", .parse = netlink_parse_flow_offload },
};
static int netlink_parse_expr(const struct nftnl_expr *nle,
--- a/src/netlink_linearize.c
+++ b/src/netlink_linearize.c
@@ -1201,6 +1201,17 @@ static void netlink_gen_notrack_stmt(str
nftnl_rule_add_expr(ctx->nlr, nle);
}
+static void netlink_gen_flow_offload_stmt(struct netlink_linearize_ctx *ctx,
+ const struct stmt *stmt)
+{
+ struct nftnl_expr *nle;
+
+ nle = alloc_nft_expr("flow_offload");
+ nftnl_expr_set_str(nle, NFTNL_EXPR_FLOW_TABLE_NAME,
+ stmt->flow.table_name);
+ nftnl_rule_add_expr(ctx->nlr, nle);
+}
+
static void netlink_gen_set_stmt(struct netlink_linearize_ctx *ctx,
const struct stmt *stmt)
{
@@ -1300,6 +1311,8 @@ static void netlink_gen_stmt(struct netl
break;
case STMT_NOTRACK:
return netlink_gen_notrack_stmt(ctx, stmt);
+ case STMT_FLOW_OFFLOAD:
+ return netlink_gen_flow_offload_stmt(ctx, stmt);
case STMT_OBJREF:
return netlink_gen_objref_stmt(ctx, stmt);
default:
--- a/src/parser_bison.y
+++ b/src/parser_bison.y
@@ -248,6 +248,7 @@ int nft_lex(void *, void *, void *);
%token SIZE "size"
%token FLOW "flow"
+%token OFFLOAD "offload"
%token METER "meter"
%token METERS "meters"
@@ -3384,6 +3385,10 @@ meta_stmt : META meta_key SET stmt_expr
{
$$ = notrack_stmt_alloc(&@$);
}
+ | FLOW OFFLOAD AT string
+ {
+ $$ = flow_offload_stmt_alloc(&@$, $4);
+ }
;
offset_opt : /* empty */ { $$ = 0; }
--- a/src/scanner.l
+++ b/src/scanner.l
@@ -296,6 +296,7 @@ addrstring ({macaddr}|{ip4addr}|{ip6addr
"memory" { return MEMORY; }
"flow" { return FLOW; }
+"offload" { return OFFLOAD; }
"meter" { return METER; }
"meters" { return METERS; }
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