From: Russel Bryant <russ...@ovn.org>
Update the OVN expression parser to support address sets. Previously,
you could have a set of IP or MAC addresses in this form:
{addr1, addr2, ..., addrN}
This patch adds support for a bit of indirection where we can define a
set of addresses and refer to them by name.
$name
This '$name' can be used in the expresssions like
{addr1, addr2, $name, ... }
{$name}
$name
A future patch will expose the ability to define address sets for use.
Signed-off-by: Russell Bryant <russ...@ovn.org>
Co-authored-by: Babu Shanmugam <bscha...@redhat.com>
Signed-off-by: Babu Shanmugam <bscha...@redhat.com>
---
ovn/controller/lflow.c | 2 +-
ovn/lib/actions.c | 2 +-
ovn/lib/expr.c | 126 ++++++++++++++++++++++++++++++++++++++++++++++---
ovn/lib/expr.h | 17 +++++++
ovn/lib/lex.c | 16 +++++++
ovn/lib/lex.h | 1 +
tests/ovn.at | 50 ++++++++++++++++++++
tests/test-ovn.c | 31 ++++++++++--
8 files changed, 234 insertions(+), 11 deletions(-)
diff --git a/ovn/controller/lflow.c b/ovn/controller/lflow.c
index 52e6131..433df70 100644
--- a/ovn/controller/lflow.c
+++ b/ovn/controller/lflow.c
@@ -306,7 +306,7 @@ add_logical_flows(struct controller_ctx *ctx, const struct
lport_index *lports,
struct hmap matches;
struct expr *expr;
- expr = expr_parse_string(lflow->match, &symtab, &error);
+ expr = expr_parse_string(lflow->match, &symtab, NULL, &error);
if (!error) {
if (prereqs) {
expr = expr_combine(EXPR_T_AND, expr, prereqs);
diff --git a/ovn/lib/actions.c b/ovn/lib/actions.c
index 569970e..ebd7159 100644
--- a/ovn/lib/actions.c
+++ b/ovn/lib/actions.c
@@ -208,7 +208,7 @@ add_prerequisite(struct action_context *ctx, const char
*prerequisite)
struct expr *expr;
char *error;
- expr = expr_parse_string(prerequisite, ctx->ap->symtab, &error);
+ expr = expr_parse_string(prerequisite, ctx->ap->symtab, NULL, &error);
ovs_assert(!error);
ctx->prereqs = expr_combine(EXPR_T_AND, ctx->prereqs, expr);
}
diff --git a/ovn/lib/expr.c b/ovn/lib/expr.c
index 91bff07..2883ca9 100644
--- a/ovn/lib/expr.c
+++ b/ovn/lib/expr.c
@@ -409,6 +409,7 @@ expr_print(const struct expr *e)
struct expr_context {
struct lexer *lexer; /* Lexer for pulling more tokens. */
const struct shash *symtab; /* Symbol table. */
+ const struct shash *macros; /* Table of macros. */
char *error; /* Error, if any, otherwise NULL. */
bool not; /* True inside odd number of NOT operators. */
};
@@ -729,6 +730,44 @@ assign_constant_set_type(struct expr_context *ctx,
}
static bool
+parse_macros(struct expr_context *ctx, struct expr_constant_set *cs,
+ size_t *allocated_values)
+{
+ if (!ctx->macros) {
+ expr_syntax_error(ctx, "No macros defined.");
+ return false;
+ }
+
+ struct expr_constant_set *addr_set
+ = shash_find_data(ctx->macros, ctx->lexer->token.s);
+ if (!addr_set) {
+ expr_syntax_error(ctx, "Unknown macro: '%s'", ctx->lexer->token.s);
+ return false;
+ }
+
+ if (!assign_constant_set_type(ctx, cs, EXPR_C_INTEGER)) {
+ return false;
+ }
+
+ size_t n_values = cs->n_values + addr_set->n_values;
+ if (n_values >= *allocated_values) {
+ cs->values = xrealloc(cs->values, n_values * sizeof *cs->values);
+ *allocated_values = n_values;
+ }
+ size_t i;
+ for (i = 0; i < addr_set->n_values; i++) {
+ union expr_constant *c1 = &cs->values[cs->n_values++];
+ union expr_constant *c2 = &addr_set->values[i];
+ c1->value = c2->value;
+ c1->format = c2->format;
+ c1->masked = c2->masked;
+ c1->mask = c2->mask;
+ }
+
+ return true;
+}
+
+static bool
parse_constant(struct expr_context *ctx, struct expr_constant_set *cs,
size_t *allocated_values)
{
@@ -759,6 +798,12 @@ parse_constant(struct expr_context *ctx, struct
expr_constant_set *cs,
}
lexer_get(ctx->lexer);
return true;
+ } else if (ctx->lexer->token.type == LEX_T_MACRO) {
+ if (!parse_macros(ctx, cs, allocated_values)) {
+ return false;
+ }
+ lexer_get(ctx->lexer);
+ return true;
} else {
expr_syntax_error(ctx, "expecting constant.");
return false;
@@ -808,6 +853,72 @@ expr_constant_set_destroy(struct expr_constant_set *cs)
}
}
+void
+expr_macros_add(struct shash *macros, const char *name,
+ const char * const *values, size_t n_values)
+{
+ /* Replace any existing entry for this name. */
+ expr_macros_remove(macros, name);
+
+ struct expr_constant_set *cset = xzalloc(sizeof *cset);
+ cset->type = EXPR_C_INTEGER;
+ cset->in_curlies = true;
+ cset->n_values = n_values;
+ cset->values = xmalloc(cset->n_values * sizeof *cset->values);
+ size_t i, errors = 0;
+ for (i = 0; i < n_values; i++) {
+ /* Use the lexer to convert each macro into the proper
+ * integer format. */
+ struct lexer lex;
+ lexer_init(&lex, values[i]);
+ lexer_get(&lex);
+ if (lex.token.type != LEX_T_INTEGER
+ && lex.token.type != LEX_T_MASKED_INTEGER) {
+ VLOG_WARN("Invalid address set entry: '%s', token type: %d",
+ values[i], lex.token.type);
+ errors += 1;
+ } else {
+ union expr_constant *c = &cset->values[i - errors];
+ c->value = lex.token.value;
+ c->format = lex.token.format;
+ c->masked = lex.token.type == LEX_T_MASKED_INTEGER;
+ if (c->masked) {
+ c->mask = lex.token.mask;
+ }
+ }
+ lexer_destroy(&lex);
+ }
+ cset->n_values -= errors;
+
+ shash_add(macros, name, cset);
+}
+
+void
+expr_macros_remove(struct shash *macros, const char *name)
+{
+ struct expr_constant_set *cset
+ = shash_find_and_delete(macros, name);
+
+ if (cset) {
+ expr_constant_set_destroy(cset);
+ free(cset);
+ }
+}
+
+/* Destroy all contents of macros. */
+void
+expr_macros_destroy(struct shash *macros)
+{
+ struct shash_node *node, *next;
+
+ SHASH_FOR_EACH_SAFE (node, next, macros) {
+ struct expr_constant_set *cset = node->data;
+
+ shash_delete(macros, node);
+ expr_constant_set_destroy(cset);
+ }
+}
+
static struct expr *
expr_parse_primary(struct expr_context *ctx, bool *atomic)
{
@@ -980,9 +1091,11 @@ expr_parse__(struct expr_context *ctx)
* The caller must eventually free the returned expression (with
* expr_destroy()) or error (with free()). */
struct expr *
-expr_parse(struct lexer *lexer, const struct shash *symtab, char **errorp)
+expr_parse(struct lexer *lexer, const struct shash *symtab,
+ const struct shash *macros, char **errorp)
{
- struct expr_context ctx = { .lexer = lexer, .symtab = symtab };
+ struct expr_context ctx = { .lexer = lexer, .symtab = symtab,
+ .macros = macros };
struct expr *e = expr_parse__(&ctx);
*errorp = ctx.error;
ovs_assert((ctx.error != NULL) != (e != NULL));
@@ -991,14 +1104,15 @@ expr_parse(struct lexer *lexer, const struct shash
*symtab, char **errorp)
/* Like expr_parse(), but the expression is taken from 's'. */
struct expr *
-expr_parse_string(const char *s, const struct shash *symtab, char **errorp)
+expr_parse_string(const char *s, const struct shash *symtab,
+ const struct shash *macros, char **errorp)
{
struct lexer lexer;
struct expr *expr;
lexer_init(&lexer, s);
lexer_get(&lexer);
- expr = expr_parse(&lexer, symtab, errorp);
+ expr = expr_parse(&lexer, symtab, macros, errorp);
if (!*errorp && lexer.token.type != LEX_T_END) {
*errorp = xstrdup("Extra tokens at end of input.");
expr_destroy(expr);
@@ -1149,7 +1263,7 @@ expr_get_level(const struct expr *expr)
static enum expr_level
expr_parse_level(const char *s, const struct shash *symtab, char **errorp)
{
- struct expr *expr = expr_parse_string(s, symtab, errorp);
+ struct expr *expr = expr_parse_string(s, symtab, NULL, errorp);
enum expr_level level = expr ? expr_get_level(expr) : EXPR_L_NOMINAL;
expr_destroy(expr);
return level;
@@ -1292,7 +1406,7 @@ parse_and_annotate(const char *s, const struct shash
*symtab,
char *error;
struct expr *expr;
- expr = expr_parse_string(s, symtab, &error);
+ expr = expr_parse_string(s, symtab, NULL, &error);
if (expr) {
expr = expr_annotate__(expr, symtab, nesting, &error);
}
diff --git a/ovn/lib/expr.h b/ovn/lib/expr.h
index d6f8489..56f6bbb 100644
--- a/ovn/lib/expr.h
+++ b/ovn/lib/expr.h
@@ -352,8 +352,10 @@ expr_from_node(const struct ovs_list *node)
void expr_format(const struct expr *, struct ds *);
void expr_print(const struct expr *);
struct expr *expr_parse(struct lexer *, const struct shash *symtab,
+ const struct shash *macros,
char **errorp);
struct expr *expr_parse_string(const char *, const struct shash *symtab,
+ const struct shash *macros,
char **errorp);
struct expr *expr_clone(struct expr *);
@@ -453,4 +455,19 @@ char *expr_parse_constant_set(struct lexer *, const struct
shash *symtab,
OVS_WARN_UNUSED_RESULT;
void expr_constant_set_destroy(struct expr_constant_set *cs);
+
+/* MACRO Variables
+ *
+ * Instead of referring to a set of value as:
+ * {addr1, addr2, ..., addrN}
+ * You can register a set of values and refer to them as:
+ * $name
+ * The macros should all have integer/masked-integer values.
+ * The values that don't qualify are ingnored
+ */
+void expr_macros_add(struct shash *macros, const char *name,
+ const char * const *values, size_t n_values);
+void expr_macros_remove(struct shash *macros, const char *name);
+void expr_macros_destroy(struct shash *macros);
+
#endif /* ovn/expr.h */
diff --git a/ovn/lib/lex.c b/ovn/lib/lex.c
index 556288f..bbbc7fc 100644
--- a/ovn/lib/lex.c
+++ b/ovn/lib/lex.c
@@ -227,6 +227,10 @@ lex_token_format(const struct lex_token *token, struct ds
*s)
lex_token_format_masked_integer(token, s);
break;
+ case LEX_T_MACRO:
+ ds_put_cstr(s, token->s);
+ break;
+
case LEX_T_LPAREN:
ds_put_cstr(s, "(");
break;
@@ -527,6 +531,14 @@ lex_parse_id(const char *p, struct lex_token *token)
return p;
}
+static const char *
+lex_parse_macro(const char *p, struct lex_token *token)
+{
+ p = lex_parse_id(++p, token);
+ token->type = LEX_T_MACRO;
+ return p;
+}
+
/* Initializes 'token' and parses the first token from the beginning of
* null-terminated string 'p' into 'token'. Stores a pointer to the start of
* the token (after skipping white space and comments, if any) into '*startp'.
@@ -697,6 +709,10 @@ next:
}
break;
+ case '$':
+ p = lex_parse_macro(p, token);
+ break;
+
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
case ':':
diff --git a/ovn/lib/lex.h b/ovn/lib/lex.h
index 578ef40..826465c 100644
--- a/ovn/lib/lex.h
+++ b/ovn/lib/lex.h
@@ -36,6 +36,7 @@ enum lex_type {
LEX_T_STRING, /* "foo" */
LEX_T_INTEGER, /* 12345 or 1.2.3.4 or ::1 or 01:02:03:04:05 */
LEX_T_MASKED_INTEGER, /* 12345/10 or 1.2.0.0/16 or ::2/127 or... */
+ LEX_T_MACRO, /* $NAME */
LEX_T_ERROR, /* invalid input */
/* Bare tokens. */
diff --git a/tests/ovn.at b/tests/ovn.at
index 297070c..840d0ef 100644
--- a/tests/ovn.at
+++ b/tests/ovn.at
@@ -434,6 +434,56 @@ AT_CHECK([expr_to_flow 'inport == "eth0" && inport ==
"eth1"'], [0], [dnl
])
AT_CLEANUP
+AT_SETUP([ovn -- converting expressions to flows -- address sets])
+expr_to_flow () {
+ echo "$1" | ovstest test-ovn expr-to-flows | sort
+}
+AT_CHECK([expr_to_flow 'ip4.src == {10.0.0.1, 10.0.0.2, 10.0.0.3}'], [0], [dnl
+ip,nw_src=10.0.0.1
+ip,nw_src=10.0.0.2
+ip,nw_src=10.0.0.3
+])
+AT_CHECK([expr_to_flow 'ip4.src == $set1'], [0], [dnl
+ip,nw_src=10.0.0.1
+ip,nw_src=10.0.0.2
+ip,nw_src=10.0.0.3
+])
+AT_CHECK([expr_to_flow 'ip4.src == {1.2.3.4, $set1}'], [0], [dnl
+ip,nw_src=1.2.3.4
+ip,nw_src=10.0.0.1
+ip,nw_src=10.0.0.2
+ip,nw_src=10.0.0.3
+])
+AT_CHECK([expr_to_flow 'ip4.src == {1.2.0.0/20, 5.5.5.0/24, $set1}'], [0], [dnl
+ip,nw_src=1.2.0.0/20
+ip,nw_src=10.0.0.1
+ip,nw_src=10.0.0.2
+ip,nw_src=10.0.0.3
+ip,nw_src=5.5.5.0/24
+])
+AT_CHECK([expr_to_flow 'ip6.src == {::1, ::2, ::3}'], [0], [dnl
+ipv6,ipv6_src=::1
+ipv6,ipv6_src=::2
+ipv6,ipv6_src=::3
+])
+AT_CHECK([expr_to_flow 'ip6.src == {::1, $set2, ::4}'], [0], [dnl
+ipv6,ipv6_src=::1
+ipv6,ipv6_src=::2
+ipv6,ipv6_src=::3
+ipv6,ipv6_src=::4
+])
+AT_CHECK([expr_to_flow 'eth.src == {00:00:00:00:00:01, 00:00:00:00:00:02,
00:00:00:00:00:03}'], [0], [dnl
+dl_src=00:00:00:00:00:01
+dl_src=00:00:00:00:00:02
+dl_src=00:00:00:00:00:03
+])
+AT_CHECK([expr_to_flow 'eth.src == {$set3}'], [0], [dnl
+dl_src=00:00:00:00:00:01
+dl_src=00:00:00:00:00:02
+dl_src=00:00:00:00:00:03
+])
+AT_CLEANUP
+
AT_SETUP([ovn -- action parsing])
dnl Text before => is input, text after => is expected output.
AT_DATA([test-cases.txt], [[
diff --git a/tests/test-ovn.c b/tests/test-ovn.c
index 18e5aca..15ebba7 100644
--- a/tests/test-ovn.c
+++ b/tests/test-ovn.c
@@ -268,6 +268,26 @@ create_dhcp_opts(struct hmap *dhcp_opts)
dhcp_opt_add(dhcp_opts, "lease_time", 51, "uint32");
}
+static void
+create_macros(struct shash *macros)
+{
+ shash_init(macros);
+
+ const char * const addrs1[] = {
+ "10.0.0.1", "10.0.0.2", "10.0.0.3",
+ };
+ const char * const addrs2[] = {
+ "::1", "::2", "::3",
+ };
+ const char * const addrs3[] = {
+ "00:00:00:00:00:01", "00:00:00:00:00:02", "00:00:00:00:00:03",
+ };
+
+ expr_macros_add(macros, "set1", addrs1, 3);
+ expr_macros_add(macros, "set2", addrs2, 3);
+ expr_macros_add(macros, "set3", addrs3, 3);
+}
+
static bool
lookup_port_cb(const void *ports_, const char *port_name, unsigned int *portp)
{
@@ -284,10 +304,12 @@ static void
test_parse_expr__(int steps)
{
struct shash symtab;
+ struct shash macros;
struct simap ports;
struct ds input;
create_symtab(&symtab);
+ create_macros(¯os);
simap_init(&ports);
simap_put(&ports, "eth0", 5);
@@ -299,7 +321,8 @@ test_parse_expr__(int steps)
struct expr *expr;
char *error;
- expr = expr_parse_string(ds_cstr(&input), &symtab, &error);
+ expr = expr_parse_string(ds_cstr(&input), &symtab, ¯os,
+ &error);
if (!error && steps > 0) {
expr = expr_annotate(expr, &symtab, &error);
}
@@ -336,6 +359,8 @@ test_parse_expr__(int steps)
simap_destroy(&ports);
expr_symtab_destroy(&symtab);
shash_destroy(&symtab);
+ expr_macros_destroy(¯os);
+ shash_destroy(¯os);
}
static void
@@ -480,7 +505,7 @@ test_evaluate_expr(struct ovs_cmdl_context *ctx)
struct expr *expr;
char *error;
- expr = expr_parse_string(ds_cstr(&input), &symtab, &error);
+ expr = expr_parse_string(ds_cstr(&input), &symtab, NULL, &error);
if (!error) {
expr = expr_annotate(expr, &symtab, &error);
}
@@ -954,7 +979,7 @@ test_tree_shape_exhaustively(struct expr *expr, struct
shash *symtab,
expr_format(expr, &s);
char *error;
- modified = expr_parse_string(ds_cstr(&s), symtab, &error);
+ modified = expr_parse_string(ds_cstr(&s), symtab, NULL, &error);
if (error) {
fprintf(stderr, "%s fails to parse (%s)\n",
ds_cstr(&s), error);
--
2.5.5
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