static void
parse_next_action(struct action_context *ctx)
{
if (!ctx->n_tables) {
action_error(ctx, "\"next\" action not allowed here.");
} else if (lexer_match(ctx->lexer, LEX_T_LPAREN)) {
int ltable;
if (!action_get_int(ctx, <able)) {
return;
}
if (!lexer_match(ctx->lexer, LEX_T_RPAREN)) {
action_syntax_error(ctx, "expecting `)'");
return;
}
if (ltable >= ctx->n_tables) {
action_error(ctx, "\"next\" argument must be in range 0 to %d.",
ctx->n_tables - 1);
return;
}
emit_resubmit(ctx, ctx->first_ptable + ltable);
} else {
if (ctx->cur_ltable < ctx->n_tables) {
emit_resubmit(ctx, ctx->first_ptable + ctx->cur_ltable + 1);
} else {
action_error(ctx, "\"next\" action not allowed in last table.");
}
}
}
static bool
parse_action(struct action_context *ctx)
{
if (ctx->lexer->token.type != LEX_T_ID) {
action_syntax_error(ctx, NULL);
return false;
}
enum lex_type lookahead = lexer_lookahead(ctx->lexer);
if (lookahead == LEX_T_EQUALS || lookahead == LEX_T_EXCHANGE
|| lookahead == LEX_T_LSQUARE) {
parse_set_action(ctx);
} else if (lexer_match_id(ctx->lexer, "next")) {
parse_next_action(ctx);
} else if (lexer_match_id(ctx->lexer, "output")) {
emit_resubmit(ctx, ctx->ap->output_ptable);
} else if (lexer_match_id(ctx->lexer, "ip.ttl")) {
if (lexer_match(ctx->lexer, LEX_T_DECREMENT)) {
add_prerequisite(ctx, "ip");
ofpact_put_DEC_TTL(ctx->ofpacts);
} else {
action_syntax_error(ctx, "expecting `--'");
}
} else if (lexer_match_id(ctx->lexer, "ct_next")) {
emit_ct(ctx, true, false);
} else if (lexer_match_id(ctx->lexer, "ct_commit")) {
emit_ct(ctx, false, true);
} else {
action_syntax_error(ctx, "expecting action");
}
if (!lexer_match(ctx->lexer, LEX_T_SEMICOLON)) {
action_syntax_error(ctx, "expecting ';'");
}
return !ctx->error;
}
static void
parse_actions(struct action_context *ctx)
{
/* "drop;" by itself is a valid (empty) set of actions, but it can't be
* combined with other actions because that doesn't make sense. */
if (ctx->lexer->token.type == LEX_T_ID
&& !strcmp(ctx->lexer->token.s, "drop")
&& lexer_lookahead(ctx->lexer) == LEX_T_SEMICOLON) {
lexer_get(ctx->lexer); /* Skip "drop". */
lexer_get(ctx->lexer); /* Skip ";". */
if (ctx->lexer->token.type != LEX_T_END) {
action_syntax_error(ctx, "expecting end of input");
}
return;
}
while (ctx->lexer->token.type != LEX_T_END) {
if (ctx->lexer->token.type != LEX_T_ID) {
action_syntax_error(ctx, NULL);
break;
}
enum lex_type lookahead = lexer_lookahead(ctx->lexer);
if (lookahead == LEX_T_EQUALS || lookahead == LEX_T_EXCHANGE
|| lookahead == LEX_T_LSQUARE) {
parse_set_action(ctx);
} else if (lexer_match_id(ctx->lexer, "next")) {
parse_next_action(ctx);
} else if (lexer_match_id(ctx->lexer, "output")) {
emit_resubmit(ctx, ctx->output_ptable);
} else if (lexer_match_id(ctx->lexer, "ip4.ttl")) {
if (lexer_match(ctx->lexer, LEX_T_DECREMENT)) {
struct expr *e = expr_parse_string("ip4", ctx->symtab,
&ctx->error);
ctx->prereqs = expr_combine(EXPR_T_AND, ctx->prereqs, e);
ofpact_put_DEC_TTL(ctx->ofpacts);
} else {
action_syntax_error(ctx, "expecting `--'");
}
} else if (lexer_match_id(ctx->lexer, "ct_next")) {
emit_ct(ctx, true, false);
} else if (lexer_match_id(ctx->lexer, "ct_commit")) {
emit_ct(ctx, false, true);
} else {
action_syntax_error(ctx, "expecting action");
}
if (!lexer_match(ctx->lexer, LEX_T_SEMICOLON)) {
action_syntax_error(ctx, "expecting ';'");
}
if (ctx->error) {
return;
}
}
}
