This new operation allows to import ruleset in json to make
incremental changes using the parse functions of libnftnl.
A basic way to test this new functionality is:
% cat file.json | nft import json
where the file.json is a ruleset exported in json format.
Highly based on work from Alvaro Neira <alvaron...@gmail.com>
and Arturo Borrero <art...@netfilter.org>
Signed-off-by: Shyam Saini <mayhs11sa...@gmail.com>
---
V3:
Follow kernel coding style
---
include/netlink.h | 9 ++
include/rule.h | 14 +--
src/evaluate.c | 2 +
src/netlink.c | 288 +++++++++++++++++++++++++++++++++++++++++++++++++++++
src/parser_bison.y | 38 +++++--
src/rule.c | 45 +++++++--
src/scanner.l | 1 +
7 files changed, 370 insertions(+), 27 deletions(-)
diff --git a/include/netlink.h b/include/netlink.h
index b395cf1cd9ad..b63740b38c2a 100644
--- a/include/netlink.h
+++ b/include/netlink.h
@@ -225,4 +225,13 @@ bool netlink_batch_supported(struct mnl_socket *nf_sock,
uint32_t *seqnum);
int netlink_echo_callback(const struct nlmsghdr *nlh, void *data);
+struct ruleset_parse {
+ struct netlink_ctx *nl_ctx;
+ struct cmd *cmd;
+};
+
+struct nftnl_parse_ctx;
+
+int netlink_markup_parse_cb(const struct nftnl_parse_ctx *ctx);
+
#endif /* NFTABLES_NETLINK_H */
diff --git a/include/rule.h b/include/rule.h
index 631a1bcdf84e..56dee9766b2b 100644
--- a/include/rule.h
+++ b/include/rule.h
@@ -327,6 +327,7 @@ uint32_t obj_type_to_cmd(uint32_t type);
* @CMD_RESET: reset container
* @CMD_FLUSH: flush container
* @CMD_RENAME: rename object
+ * @CMD_IMPORT: import a ruleset in a given format
* @CMD_EXPORT: export the ruleset in a given format
* @CMD_MONITOR: event listener
* @CMD_DESCRIBE: describe an expression
@@ -342,6 +343,7 @@ enum cmd_ops {
CMD_RESET,
CMD_FLUSH,
CMD_RENAME,
+ CMD_IMPORT,
CMD_EXPORT,
CMD_MONITOR,
CMD_DESCRIBE,
@@ -361,7 +363,7 @@ enum cmd_ops {
* @CMD_OBJ_RULESET: ruleset
* @CMD_OBJ_EXPR: expression
* @CMD_OBJ_MONITOR: monitor
- * @CMD_OBJ_EXPORT: export
+ * @CMD_OBJ_MARKUP: import/export
* @CMD_OBJ_COUNTER: counter
* @CMD_OBJ_COUNTERS: multiple counters
* @CMD_OBJ_QUOTA: quota
@@ -381,7 +383,7 @@ enum cmd_obj {
CMD_OBJ_RULESET,
CMD_OBJ_EXPR,
CMD_OBJ_MONITOR,
- CMD_OBJ_EXPORT,
+ CMD_OBJ_MARKUP,
CMD_OBJ_FLOWTABLE,
CMD_OBJ_FLOWTABLES,
CMD_OBJ_MAP,
@@ -396,12 +398,12 @@ enum cmd_obj {
CMD_OBJ_LIMITS,
};
-struct export {
+struct markup {
uint32_t format;
};
-struct export *export_alloc(uint32_t format);
-void export_free(struct export *e);
+struct markup *markup_alloc(uint32_t format);
+void markup_free(struct markup *m);
enum {
CMD_MONITOR_OBJ_ANY,
@@ -454,7 +456,7 @@ struct cmd {
struct chain *chain;
struct table *table;
struct monitor *monitor;
- struct export *export;
+ struct markup *markup;
struct obj *object;
};
const void *arg;
diff --git a/src/evaluate.c b/src/evaluate.c
index e767542a868e..2275a3026255 100644
--- a/src/evaluate.c
+++ b/src/evaluate.c
@@ -3407,6 +3407,8 @@ int cmd_evaluate(struct eval_ctx *ctx, struct cmd *cmd)
return 0;
case CMD_MONITOR:
return cmd_evaluate_monitor(ctx, cmd);
+ case CMD_IMPORT:
+ return 0;
default:
BUG("invalid command operation %u\n", cmd->op);
};
diff --git a/src/netlink.c b/src/netlink.c
index 291bbdeeaa68..de4d284d5e9b 100644
--- a/src/netlink.c
+++ b/src/netlink.c
@@ -24,6 +24,7 @@
#include <libnftnl/object.h>
#include <libnftnl/set.h>
#include <libnftnl/udata.h>
+#include <libnftnl/ruleset.h>
#include <libnftnl/common.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nf_tables.h>
@@ -3030,6 +3031,293 @@ int netlink_monitor(struct netlink_mon_handler
*monhandler,
return mnl_nft_event_listener(&ctx, netlink_events_cb, monhandler);
}
+static int netlink_markup_setelems(const struct nftnl_parse_ctx *ctx)
+{
+ const struct ruleset_parse *rp;
+ struct nftnl_set *set;
+ uint32_t cmd;
+ int ret = -1;
+
+ set = nftnl_ruleset_ctx_get(ctx, NFTNL_RULESET_CTX_SET);
+ rp = nftnl_ruleset_ctx_get(ctx, NFTNL_RULESET_CTX_DATA);
+
+ cmd = nftnl_ruleset_ctx_get_u32(ctx, NFTNL_RULESET_CTX_CMD);
+ switch (cmd) {
+ case NFTNL_CMD_ADD:
+ ret = mnl_nft_setelem_batch_add(set, rp->nl_ctx->batch,
+ 0, rp->nl_ctx->seqnum);
+ break;
+ case NFTNL_CMD_DELETE:
+ ret = mnl_nft_setelem_batch_del(set, rp->nl_ctx->batch,
+ 0, rp->nl_ctx->seqnum);
+ break;
+ default:
+ errno = EOPNOTSUPP;
+ break;
+ }
+
+ return ret;
+}
+
+static int netlink_markup_set(const struct nftnl_parse_ctx *ctx)
+{
+ const struct ruleset_parse *rp;
+ struct nftnl_set *set;
+ uint32_t cmd;
+ int ret = -1;
+
+ set = nftnl_ruleset_ctx_get(ctx, NFTNL_RULESET_CTX_SET);
+ rp = nftnl_ruleset_ctx_get(ctx, NFTNL_RULESET_CTX_DATA);
+
+ cmd = nftnl_ruleset_ctx_get_u32(ctx, NFTNL_RULESET_CTX_CMD);
+ switch (cmd) {
+ case NFTNL_CMD_ADD:
+ ret = mnl_nft_set_batch_add(set, rp->nl_ctx->batch, NLM_F_EXCL,
+ rp->nl_ctx->seqnum);
+ break;
+ case NFTNL_CMD_DELETE:
+ ret = mnl_nft_set_batch_del(set, rp->nl_ctx->batch,
+ 0, rp->nl_ctx->seqnum);
+ break;
+ default:
+ errno = EOPNOTSUPP;
+ break;
+ }
+
+ if (ret < 0)
+ return ret;
+
+ return netlink_markup_setelems(ctx);
+}
+
+static int netlink_markup_build_rule(const struct nftnl_parse_ctx *ctx,
+ uint32_t cmd, struct nftnl_rule *rule)
+{
+ const struct ruleset_parse *rp;
+ uint32_t nl_flags;
+ int ret = -1;
+
+ rp = nftnl_ruleset_ctx_get(ctx, NFTNL_RULESET_CTX_DATA);
+
+ switch (cmd) {
+ case NFTNL_CMD_ADD:
+ nl_flags = NLM_F_APPEND | NLM_F_CREATE;
+ nftnl_rule_unset(rule, NFTNL_RULE_HANDLE);
+ ret = mnl_nft_rule_batch_add(rule, rp->nl_ctx->batch, nl_flags,
+ rp->nl_ctx->seqnum);
+ break;
+ case NFTNL_CMD_DELETE:
+ ret = mnl_nft_rule_batch_del(rule, rp->nl_ctx->batch,
+ 0, rp->nl_ctx->seqnum);
+ break;
+ case NFTNL_CMD_REPLACE:
+ nl_flags = NLM_F_REPLACE;
+ ret = mnl_nft_rule_batch_add(rule, rp->nl_ctx->batch, nl_flags,
+ rp->nl_ctx->seqnum);
+ break;
+ case NFTNL_CMD_INSERT:
+ nl_flags = NLM_F_CREATE;
+ nftnl_rule_unset(rule, NFTNL_RULE_HANDLE);
+ ret = mnl_nft_rule_batch_add(rule, rp->nl_ctx->batch, nl_flags,
+ rp->nl_ctx->seqnum);
+ break;
+ default:
+ errno = EOPNOTSUPP;
+ break;
+ }
+
+ return ret;
+
+}
+
+static int netlink_markup_rule(const struct nftnl_parse_ctx *ctx)
+{
+ struct nftnl_rule *rule;
+ uint32_t cmd;
+
+ cmd = nftnl_ruleset_ctx_get_u32(ctx, NFTNL_RULESET_CTX_CMD);
+ rule = nftnl_ruleset_ctx_get(ctx, NFTNL_RULESET_CTX_RULE);
+
+ return netlink_markup_build_rule(ctx, cmd, rule);
+}
+
+static int netlink_markup_build_flush(const struct nftnl_parse_ctx *ctx)
+{
+ struct nftnl_rule *rule;
+ struct nftnl_table *table;
+ struct nftnl_chain *chain;
+ uint32_t type;
+ int ret = -1;
+
+ rule = nftnl_rule_alloc();
+ if (rule == NULL)
+ return -1;
+
+ type = nftnl_ruleset_ctx_get_u32(ctx, NFTNL_RULESET_CTX_TYPE);
+ switch (type) {
+ case NFTNL_RULESET_TABLE:
+ table = nftnl_ruleset_ctx_get(ctx, NFTNL_RULESET_CTX_TABLE);
+
+ nftnl_rule_set(rule, NFTNL_RULE_TABLE,
+ nftnl_table_get(table,
+ NFTNL_TABLE_NAME));
+ nftnl_rule_set(rule, NFTNL_RULE_FAMILY,
+ nftnl_table_get(table,
+ NFTNL_TABLE_FAMILY));
+ break;
+ case NFTNL_RULESET_CHAIN:
+ chain = nftnl_ruleset_ctx_get(ctx, NFTNL_RULESET_CTX_CHAIN);
+
+ nftnl_rule_set(rule, NFTNL_RULE_TABLE,
+ nftnl_chain_get(chain,
+ NFTNL_CHAIN_TABLE));
+ nftnl_rule_set(rule, NFTNL_RULE_CHAIN,
+ nftnl_chain_get(chain,
+ NFTNL_CHAIN_NAME));
+ nftnl_rule_set(rule, NFTNL_RULE_FAMILY,
+ nftnl_chain_get(chain,
+ NFTNL_TABLE_FAMILY));
+ break;
+ default:
+ errno = EOPNOTSUPP;
+ goto err;
+ }
+
+ ret = netlink_markup_build_rule(ctx, NFTNL_CMD_DELETE, rule);
+err:
+ nftnl_rule_free(rule);
+ return ret;
+}
+
+static int netlink_markup_chain(const struct nftnl_parse_ctx *ctx)
+{
+ const struct ruleset_parse *rp;
+ struct nftnl_chain *chain;
+ uint32_t cmd;
+ int ret = -1;
+
+ chain = nftnl_ruleset_ctx_get(ctx, NFTNL_RULESET_CTX_CHAIN);
+ rp = nftnl_ruleset_ctx_get(ctx, NFTNL_RULESET_CTX_DATA);
+
+ nftnl_chain_unset(chain, NFTNL_CHAIN_HANDLE);
+
+ cmd = nftnl_ruleset_ctx_get_u32(ctx, NFTNL_RULESET_CTX_CMD);
+ switch (cmd) {
+ case NFTNL_CMD_ADD:
+ ret = mnl_nft_chain_batch_add(chain, rp->nl_ctx->batch,
+ 0, rp->nl_ctx->seqnum);
+ break;
+ case NFTNL_CMD_DELETE:
+ ret = mnl_nft_chain_batch_del(chain, rp->nl_ctx->batch,
+ 0, rp->nl_ctx->seqnum);
+ break;
+ case NFTNL_CMD_FLUSH:
+ ret = netlink_markup_build_flush(ctx);
+ break;
+ default:
+ errno = EOPNOTSUPP;
+ break;
+ }
+
+ return ret;
+}
+
+
+static int netlink_markup_build_table(const struct nftnl_parse_ctx *ctx,
+ uint32_t cmd, struct nftnl_table *table)
+{
+ struct ruleset_parse *rp;
+ int ret = -1;
+
+ rp = nftnl_ruleset_ctx_get(ctx, NFTNL_RULESET_CTX_DATA);
+
+ switch (cmd) {
+ case NFTNL_CMD_ADD:
+ ret = mnl_nft_table_batch_add(table, rp->nl_ctx->batch,
+ 0, rp->nl_ctx->seqnum);
+ break;
+ case NFTNL_CMD_DELETE:
+ ret = mnl_nft_table_batch_del(table, rp->nl_ctx->batch,
+ 0, rp->nl_ctx->seqnum);
+ break;
+ case NFTNL_CMD_FLUSH:
+ ret = netlink_markup_build_flush(ctx);
+ break;
+ default:
+ errno = EOPNOTSUPP;
+ break;
+ }
+
+ return ret;
+}
+
+static int netlink_markup_table(const struct nftnl_parse_ctx *ctx)
+{
+ struct nftnl_table *table;
+ uint32_t cmd;
+
+ cmd = nftnl_ruleset_ctx_get_u32(ctx, NFTNL_RULESET_CTX_CMD);
+ table = nftnl_ruleset_ctx_get(ctx, NFTNL_RULESET_CTX_TABLE);
+
+ return netlink_markup_build_table(ctx, cmd, table);
+}
+
+static int netlink_markup_flush(const struct nftnl_parse_ctx *ctx)
+{
+ struct nftnl_table *table;
+ int ret;
+
+ table = nftnl_table_alloc();
+ if (table == NULL)
+ return -1;
+
+ ret = netlink_markup_build_table(ctx, NFTNL_CMD_DELETE, table);
+ nftnl_table_free(table);
+
+ return ret;
+}
+
+int netlink_markup_parse_cb(const struct nftnl_parse_ctx *ctx)
+{
+ struct ruleset_parse *rp;
+ uint32_t type;
+ int ret = -1;
+
+ rp = nftnl_ruleset_ctx_get(ctx, NFTNL_RULESET_CTX_DATA);
+
+ type = nftnl_ruleset_ctx_get_u32(ctx, NFTNL_RULESET_CTX_TYPE);
+ switch (type) {
+ case NFTNL_RULESET_TABLE:
+ ret = netlink_markup_table(ctx);
+ break;
+ case NFTNL_RULESET_CHAIN:
+ ret = netlink_markup_chain(ctx);
+ break;
+ case NFTNL_RULESET_RULE:
+ ret = netlink_markup_rule(ctx);
+ break;
+ case NFTNL_RULESET_SET:
+ ret = netlink_markup_set(ctx);
+ break;
+ case NFTNL_RULESET_SET_ELEMS:
+ ret = netlink_markup_setelems(ctx);
+ break;
+ case NFTNL_RULESET_RULESET:
+ ret = netlink_markup_flush(ctx);
+ break;
+ default:
+ errno = EOPNOTSUPP;
+ break;
+ }
+
+ nftnl_ruleset_ctx_free(ctx);
+ if (ret < 0)
+ netlink_io_error(rp->nl_ctx, &rp->cmd->location,
+ "Could not import: %s", strerror(errno));
+
+ return 0;
+}
+
bool netlink_batch_supported(struct mnl_socket *nf_sock, uint32_t *seqnum)
{
return mnl_batch_supported(nf_sock, seqnum);
diff --git a/src/parser_bison.y b/src/parser_bison.y
index 31a7e8be2bcd..e17653e4e28f 100644
--- a/src/parser_bison.y
+++ b/src/parser_bison.y
@@ -213,6 +213,7 @@ static void location_update(struct location *loc, struct
location *rhs, int n)
%token FLUSH "flush"
%token RENAME "rename"
%token DESCRIBE "describe"
+%token IMPORT "import"
%token EXPORT "export"
%token MONITOR "monitor"
@@ -475,8 +476,8 @@ static void location_update(struct location *loc, struct
location *rhs, int n)
%type <cmd> line
%destructor { cmd_free($$); } line
-%type <cmd> base_cmd add_cmd replace_cmd create_cmd
insert_cmd delete_cmd list_cmd reset_cmd flush_cmd rename_cmd export_cmd
monitor_cmd describe_cmd
-%destructor { cmd_free($$); } base_cmd add_cmd replace_cmd create_cmd
insert_cmd delete_cmd list_cmd reset_cmd flush_cmd rename_cmd export_cmd
monitor_cmd describe_cmd
+%type <cmd> base_cmd add_cmd replace_cmd create_cmd
insert_cmd delete_cmd list_cmd reset_cmd flush_cmd rename_cmd export_cmd
monitor_cmd describe_cmd import_cmd
+%destructor { cmd_free($$); } base_cmd add_cmd replace_cmd create_cmd
insert_cmd delete_cmd list_cmd reset_cmd flush_cmd rename_cmd export_cmd
monitor_cmd describe_cmd import_cmd
%type <handle> table_spec chain_spec chain_identifier
ruleid_spec handle_spec position_spec rule_position ruleset_spec
%destructor { handle_free(&$$); } table_spec chain_spec chain_identifier
ruleid_spec handle_spec position_spec rule_position ruleset_spec
@@ -655,7 +656,7 @@ static void location_update(struct location *loc, struct
location *rhs, int n)
%destructor { expr_free($$); } fib_expr
%type <val> fib_tuple fib_result fib_flag
-%type <val> export_format
+%type <val> markup_format
%type <string> monitor_event
%destructor { xfree($$); } monitor_event
%type <val> monitor_object monitor_format
@@ -788,6 +789,7 @@ base_cmd : /* empty */ add_cmd
{ $$ = $1; }
| RESET reset_cmd { $$ = $2; }
| FLUSH flush_cmd { $$ = $2; }
| RENAME rename_cmd { $$ = $2; }
+ | IMPORT import_cmd { $$ = $2; }
| EXPORT export_cmd { $$ = $2; }
| MONITOR monitor_cmd { $$ = $2; }
| DESCRIBE describe_cmd { $$ = $2; }
@@ -1196,17 +1198,31 @@ rename_cmd : CHAIN
chain_spec identifier
}
;
-export_cmd : RULESET export_format
+import_cmd : RULESET markup_format
{
struct handle h = { .family = NFPROTO_UNSPEC };
- struct export *export = export_alloc($2);
- $$ = cmd_alloc(CMD_EXPORT, CMD_OBJ_EXPORT, &h,
&@$, export);
+ struct markup *markup = markup_alloc($2);
+ $$ = cmd_alloc(CMD_IMPORT, CMD_OBJ_MARKUP, &h,
&@$, markup);
}
- | export_format
+ | markup_format
{
struct handle h = { .family = NFPROTO_UNSPEC };
- struct export *export = export_alloc($1);
- $$ = cmd_alloc(CMD_EXPORT, CMD_OBJ_EXPORT, &h,
&@$, export);
+ struct markup *markup = markup_alloc($1);
+ $$ = cmd_alloc(CMD_IMPORT, CMD_OBJ_MARKUP, &h,
&@$, markup);
+ }
+ ;
+
+export_cmd : RULESET markup_format
+ {
+ struct handle h = { .family = NFPROTO_UNSPEC };
+ struct markup *markup = markup_alloc($2);
+ $$ = cmd_alloc(CMD_EXPORT, CMD_OBJ_MARKUP, &h,
&@$, markup);
+ }
+ | markup_format
+ {
+ struct handle h = { .family = NFPROTO_UNSPEC };
+ struct markup *markup = markup_alloc($1);
+ $$ = cmd_alloc(CMD_EXPORT, CMD_OBJ_MARKUP, &h,
&@$, markup);
}
;
@@ -1234,10 +1250,10 @@ monitor_object : /* empty */ { $$ =
CMD_MONITOR_OBJ_ANY; }
;
monitor_format : /* empty */ { $$ = NFTNL_OUTPUT_DEFAULT; }
- | export_format
+ | markup_format
;
-export_format : XML { $$ = NFTNL_OUTPUT_XML; }
+markup_format : XML { $$ = NFTNL_OUTPUT_XML; }
| JSON { $$ = NFTNL_OUTPUT_JSON; }
;
diff --git a/src/rule.c b/src/rule.c
index 1bb7b4756171..e5f7347d5630 100644
--- a/src/rule.c
+++ b/src/rule.c
@@ -896,19 +896,19 @@ void nft_cmd_expand(struct cmd *cmd)
}
}
-struct export *export_alloc(uint32_t format)
+struct markup *markup_alloc(uint32_t format)
{
- struct export *export;
+ struct markup *markup;
- export = xmalloc(sizeof(struct export));
- export->format = format;
+ markup = xmalloc(sizeof(struct markup));
+ markup->format = format;
- return export;
+ return markup;
}
-void export_free(struct export *e)
+void markup_free(struct markup *m)
{
- xfree(e);
+ xfree(m);
}
struct monitor *monitor_alloc(uint32_t format, uint32_t type, const char
*event)
@@ -956,8 +956,8 @@ void cmd_free(struct cmd *cmd)
case CMD_OBJ_MONITOR:
monitor_free(cmd->monitor);
break;
- case CMD_OBJ_EXPORT:
- export_free(cmd->export);
+ case CMD_OBJ_MARKUP:
+ markup_free(cmd->markup);
break;
case CMD_OBJ_COUNTER:
case CMD_OBJ_QUOTA:
@@ -1156,13 +1156,36 @@ static int do_command_export(struct netlink_ctx *ctx,
struct cmd *cmd)
return -1;
} while (rs == NULL);
- nftnl_ruleset_fprintf(stdout, rs, cmd->export->format, 0);
+ nftnl_ruleset_fprintf(stdout, rs, cmd->markup->format,
+ NFTNL_OF_EVENT_NEW);
fprintf(stdout, "\n");
nftnl_ruleset_free(rs);
return 0;
}
+static int do_command_import(struct netlink_ctx *ctx, struct cmd *cmd)
+{
+ int ret;
+ struct nftnl_parse_err *err;
+ struct ruleset_parse rp = {
+ .nl_ctx = ctx,
+ .cmd = cmd
+ };
+
+ err = nftnl_parse_err_alloc();
+ if (err == NULL)
+ return -1;
+
+ ret = nftnl_ruleset_parse_file_cb(cmd->markup->format, stdin, err, &rp,
+ netlink_markup_parse_cb);
+ if (ret < 0)
+ nftnl_parse_perror("unable to import: parsing failed", err);
+
+ nftnl_parse_err_free(err);
+ return ret;
+}
+
static int do_list_table(struct netlink_ctx *ctx, struct cmd *cmd,
struct table *table)
{
@@ -1777,6 +1800,8 @@ int do_command(struct netlink_ctx *ctx, struct cmd *cmd)
return do_command_flush(ctx, cmd);
case CMD_RENAME:
return do_command_rename(ctx, cmd);
+ case CMD_IMPORT:
+ return do_command_import(ctx, cmd);
case CMD_EXPORT:
return do_command_export(ctx, cmd);
case CMD_MONITOR:
diff --git a/src/scanner.l b/src/scanner.l
index 0cfb6c50e418..f6d7e1e39d5b 100644
--- a/src/scanner.l
+++ b/src/scanner.l
@@ -273,6 +273,7 @@ addrstring ({macaddr}|{ip4addr}|{ip6addr})
"reset" { return RESET; }
"flush" { return FLUSH; }
"rename" { return RENAME; }
+"import" { return IMPORT; }
"export" { return EXPORT; }
"monitor" { return MONITOR; }
--
1.9.1
--
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