[PATCH nft 3/3] src: add CMD_OBJ_SETELEMS

[Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>]

This new command type results from expanding the set definition in two
commands: One to add the set and another to add the elements. This
results in 1:1 mapping between the command object to the netlink API.
The command is then translated into a netlink message which gets a
unique sequence number. This sequence number allows to correlate the
netlink extended error reporting with the corresponding command.

Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
 include/rule.h |  2 ++
 src/rule.c     | 23 +++++++++++++++++++----
 2 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/include/rule.h b/include/rule.h
index f0f7ee33a3ae..cfb76b8a0c10 100644
--- a/include/rule.h
+++ b/include/rule.h
@@ -561,6 +561,7 @@ enum cmd_ops {
  * @CMD_OBJ_ELEMENTS:	set element(s)
  * @CMD_OBJ_SET:	set
  * @CMD_OBJ_SETS:	multiple sets
+ * @CMD_OBJ_SETELEMS:	set elements
  * @CMD_OBJ_RULE:	rule
  * @CMD_OBJ_CHAIN:	chain
  * @CMD_OBJ_CHAINS:	multiple chains
@@ -588,6 +589,7 @@ enum cmd_obj {
 	CMD_OBJ_INVALID,
 	CMD_OBJ_ELEMENTS,
 	CMD_OBJ_SET,
+	CMD_OBJ_SETELEMS,
 	CMD_OBJ_SETS,
 	CMD_OBJ_RULE,
 	CMD_OBJ_CHAIN,
diff --git a/src/rule.c b/src/rule.c
index 227b9f30b91d..1f56faeb5c3c 100644
--- a/src/rule.c
+++ b/src/rule.c
@@ -1417,11 +1417,11 @@ void cmd_add_loc(struct cmd *cmd, uint16_t offset, struct location *loc)
 void nft_cmd_expand(struct cmd *cmd)
 {
 	struct list_head new_cmds;
+	struct set *set, *newset;
 	struct flowtable *ft;
 	struct table *table;
 	struct chain *chain;
 	struct rule *rule;
-	struct set *set;
 	struct obj *obj;
 	struct cmd *new;
 	struct handle h;
@@ -1477,6 +1477,18 @@ void nft_cmd_expand(struct cmd *cmd)
 		}
 		list_splice(&new_cmds, &cmd->list);
 		break;
+	case CMD_OBJ_SET:
+		set = cmd->set;
+		memset(&h, 0, sizeof(h));
+		handle_merge(&h, &set->handle);
+		newset = set_clone(set);
+		newset->handle.set_id = set->handle.set_id;
+		newset->init = set->init;
+		set->init = NULL;
+		new = cmd_alloc(CMD_ADD, CMD_OBJ_SETELEMS, &h,
+				&set->location, newset);
+		list_add(&new->list, &cmd->list);
+		break;
 	default:
 		break;
 	}
@@ -1525,6 +1537,7 @@ void cmd_free(struct cmd *cmd)
 			expr_free(cmd->expr);
 			break;
 		case CMD_OBJ_SET:
+		case CMD_OBJ_SETELEMS:
 			set_free(cmd->set);
 			break;
 		case CMD_OBJ_RULE:
@@ -1610,7 +1623,7 @@ static int do_add_setelems(struct netlink_ctx *ctx, struct cmd *cmd,
 }
 
 static int do_add_set(struct netlink_ctx *ctx, struct cmd *cmd,
-		      uint32_t flags)
+		      uint32_t flags, bool add)
 {
 	struct set *set = cmd->set;
 
@@ -1621,7 +1634,7 @@ static int do_add_set(struct netlink_ctx *ctx, struct cmd *cmd,
 				     &ctx->nft->output) < 0)
 			return -1;
 	}
-	if (mnl_nft_set_add(ctx, cmd, flags) < 0)
+	if (add && mnl_nft_set_add(ctx, cmd, flags) < 0)
 		return -1;
 	if (set->init != NULL) {
 		return __do_add_setelems(ctx, set, set->init, flags);
@@ -1644,7 +1657,9 @@ static int do_command_add(struct netlink_ctx *ctx, struct cmd *cmd, bool excl)
 	case CMD_OBJ_RULE:
 		return mnl_nft_rule_add(ctx, cmd, flags | NLM_F_APPEND);
 	case CMD_OBJ_SET:
-		return do_add_set(ctx, cmd, flags);
+		return do_add_set(ctx, cmd, flags, true);
+	case CMD_OBJ_SETELEMS:
+		return do_add_set(ctx, cmd, flags, false);
 	case CMD_OBJ_ELEMENTS:
 		return do_add_setelems(ctx, cmd, flags);
 	case CMD_OBJ_COUNTER:
-- 
2.20.1