diff options
| -rw-r--r-- | doc/libnftables-json.adoc | 11 | ||||
| -rw-r--r-- | doc/nft.txt | 9 | ||||
| -rw-r--r-- | include/rule.h | 4 | ||||
| -rw-r--r-- | src/parser_bison.y | 35 | ||||
| -rw-r--r-- | src/parser_json.c | 49 | ||||
| -rw-r--r-- | src/rule.c | 12 | ||||
| -rw-r--r-- | tests/shell/features/table_flag_persist.nft | 3 | ||||
| -rwxr-xr-x | tests/shell/testcases/owner/0002-persist | 36 |
8 files changed, 142 insertions, 17 deletions
diff --git a/doc/libnftables-json.adoc b/doc/libnftables-json.adoc index e3b24cc4..a8a6165f 100644 --- a/doc/libnftables-json.adoc +++ b/doc/libnftables-json.adoc @@ -202,12 +202,19 @@ Rename a chain. The new name is expected in a dedicated property named === TABLE [verse] +____ *{ "table": { "family":* 'STRING'*, "name":* 'STRING'*, - "handle":* 'NUMBER' + "handle":* 'NUMBER'*, + "flags":* 'TABLE_FLAGS' *}}* +'TABLE_FLAGS' := 'TABLE_FLAG' | *[* 'TABLE_FLAG_LIST' *]* +'TABLE_FLAG_LIST' := 'TABLE_FLAG' [*,* 'TABLE_FLAG_LIST' ] +'TABLE_FLAG' := *"dormant"* | *"owner"* | *"persist"* +____ + This object describes a table. *family*:: @@ -217,6 +224,8 @@ This object describes a table. *handle*:: The table's handle. In input, it is used only in *delete* command as alternative to *name*. +*flags*:: + The table's flags. === CHAIN [verse] diff --git a/doc/nft.txt b/doc/nft.txt index 248b29af..2080c073 100644 --- a/doc/nft.txt +++ b/doc/nft.txt @@ -343,8 +343,17 @@ return an error. |Flag | Description |dormant | table is not evaluated any more (base chains are unregistered). +|owner | +table is owned by the creating process. +|persist | +table shall outlive the owning process. |================= +Creating a table with flag *owner* excludes other processes from manipulating +it or its contents. By default, it will be removed when the process exits. +Setting flag *persist* will prevent this and the resulting orphaned table will +accept a new owner, e.g. a restarting daemon maintaining the table. + .*Add, change, delete a table* --------------------------------------- # start nft in interactive mode diff --git a/include/rule.h b/include/rule.h index 3a833cf3..5b3e12b5 100644 --- a/include/rule.h +++ b/include/rule.h @@ -130,10 +130,12 @@ struct symbol *symbol_get(const struct scope *scope, const char *identifier); enum table_flags { TABLE_F_DORMANT = (1 << 0), TABLE_F_OWNER = (1 << 1), + TABLE_F_PERSIST = (1 << 2), }; -#define TABLE_FLAGS_MAX 2 +#define TABLE_FLAGS_MAX 3 const char *table_flag_name(uint32_t flag); +unsigned int parse_table_flag(const char *name); /** * struct table - nftables table diff --git a/src/parser_bison.y b/src/parser_bison.y index 61bed761..53f45315 100644 --- a/src/parser_bison.y +++ b/src/parser_bison.y @@ -742,6 +742,8 @@ int nft_lex(void *, void *, void *); %type <rule> rule rule_alloc %destructor { rule_free($$); } rule +%type <val> table_flags table_flag + %type <val> set_flag_list set_flag %type <val> set_policy_spec @@ -1905,20 +1907,9 @@ table_block_alloc : /* empty */ } ; -table_options : FLAGS STRING +table_options : FLAGS table_flags { - if (strcmp($2, "dormant") == 0) { - $<table>0->flags |= TABLE_F_DORMANT; - free_const($2); - } else if (strcmp($2, "owner") == 0) { - $<table>0->flags |= TABLE_F_OWNER; - free_const($2); - } else { - erec_queue(error(&@2, "unknown table option %s", $2), - state->msgs); - free_const($2); - YYERROR; - } + $<table>0->flags |= $2; } | comment_spec { @@ -1930,6 +1921,24 @@ table_options : FLAGS STRING } ; +table_flags : table_flag + | table_flags COMMA table_flag + { + $$ = $1 | $3; + } + ; +table_flag : STRING + { + $$ = parse_table_flag($1); + free_const($1); + if ($$ == 0) { + erec_queue(error(&@1, "unknown table option %s", $1), + state->msgs); + YYERROR; + } + } + ; + table_block : /* empty */ { $$ = $<table>-1; } | table_block common_block | table_block stmt_separator diff --git a/src/parser_json.c b/src/parser_json.c index 418d4ad7..8b7efaf2 100644 --- a/src/parser_json.c +++ b/src/parser_json.c @@ -2966,6 +2966,45 @@ static struct stmt *json_parse_stmt(struct json_ctx *ctx, json_t *root) return NULL; } +static int json_parse_table_flags(struct json_ctx *ctx, json_t *root, + enum table_flags *flags) +{ + json_t *tmp, *tmp2; + size_t index; + int flag; + + if (json_unpack(root, "{s:o}", "flags", &tmp)) + return 0; + + if (json_is_string(tmp)) { + flag = parse_table_flag(json_string_value(tmp)); + if (flag) { + *flags = flag; + return 0; + } + json_error(ctx, "Invalid table flag '%s'.", + json_string_value(tmp)); + return 1; + } + if (!json_is_array(tmp)) { + json_error(ctx, "Unexpected table flags value."); + return 1; + } + json_array_foreach(tmp, index, tmp2) { + if (json_is_string(tmp2)) { + flag = parse_table_flag(json_string_value(tmp2)); + + if (flag) { + *flags |= flag; + continue; + } + } + json_error(ctx, "Invalid table flag at index %zu.", index); + return 1; + } + return 0; +} + static struct cmd *json_parse_cmd_add_table(struct json_ctx *ctx, json_t *root, enum cmd_ops op, enum cmd_obj obj) { @@ -2974,6 +3013,7 @@ static struct cmd *json_parse_cmd_add_table(struct json_ctx *ctx, json_t *root, .table.location = *int_loc, }; struct table *table = NULL; + enum table_flags flags = 0; if (json_unpack_err(ctx, root, "{s:s}", "family", &family)) @@ -2984,6 +3024,9 @@ static struct cmd *json_parse_cmd_add_table(struct json_ctx *ctx, json_t *root, return NULL; json_unpack(root, "{s:s}", "comment", &comment); + if (json_parse_table_flags(ctx, root, &flags)) + return NULL; + } else if (op == CMD_DELETE && json_unpack(root, "{s:s}", "name", &h.table.name) && json_unpack(root, "{s:I}", "handle", &h.handle.id)) { @@ -2997,10 +3040,12 @@ static struct cmd *json_parse_cmd_add_table(struct json_ctx *ctx, json_t *root, if (h.table.name) h.table.name = xstrdup(h.table.name); - if (comment) { + if (comment || flags) { table = table_alloc(); handle_merge(&table->handle, &h); - table->comment = xstrdup(comment); + if (comment) + table->comment = xstrdup(comment); + table->flags = flags; } if (op == CMD_ADD) @@ -1215,6 +1215,7 @@ struct table *table_lookup_fuzzy(const struct handle *h, static const char *table_flags_name[TABLE_FLAGS_MAX] = { "dormant", "owner", + "persist", }; const char *table_flag_name(uint32_t flag) @@ -1225,6 +1226,17 @@ const char *table_flag_name(uint32_t flag) return table_flags_name[flag]; } +unsigned int parse_table_flag(const char *name) +{ + int i; + + for (i = 0; i < TABLE_FLAGS_MAX; i++) { + if (!strcmp(name, table_flags_name[i])) + return 1 << i; + } + return 0; +} + static void table_print_flags(const struct table *table, const char **delim, struct output_ctx *octx) { diff --git a/tests/shell/features/table_flag_persist.nft b/tests/shell/features/table_flag_persist.nft new file mode 100644 index 00000000..0da3e6d4 --- /dev/null +++ b/tests/shell/features/table_flag_persist.nft @@ -0,0 +1,3 @@ +table t { + flags persist; +} diff --git a/tests/shell/testcases/owner/0002-persist b/tests/shell/testcases/owner/0002-persist new file mode 100755 index 00000000..cf4b8f13 --- /dev/null +++ b/tests/shell/testcases/owner/0002-persist @@ -0,0 +1,36 @@ +#!/bin/bash + +# NFT_TEST_REQUIRES(NFT_TEST_HAVE_table_flag_owner) +# NFT_TEST_REQUIRES(NFT_TEST_HAVE_table_flag_persist) + +die() { + echo "$@" + exit 1 +} + +$NFT -f - <<EOF +table ip t { + flags owner, persist +} +EOF +[[ $? -eq 0 ]] || { + die "table add failed" +} + +$NFT list ruleset | grep -q 'table ip t' || { + die "table does not persist" +} +$NFT list ruleset | grep -q 'flags persist$' || { + die "unexpected flags in orphaned table" +} + +$NFT -f - <<EOF +table ip t { + flags owner, persist +} +EOF +[[ $? -eq 0 ]] || { + die "retake ownership failed" +} + +exit 0 |