diff options
Diffstat (limited to 'src/netlink_delinearize.c')
| -rw-r--r-- | src/netlink_delinearize.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/netlink_delinearize.c b/src/netlink_delinearize.c index e37a34f3..323e9150 100644 --- a/src/netlink_delinearize.c +++ b/src/netlink_delinearize.c @@ -2322,6 +2322,20 @@ static void map_binop_postprocess(struct rule_pp_ctx *ctx, struct expr *expr) binop_postprocess(ctx, expr, &expr->map); } +static bool is_shift_by_zero(const struct expr *binop) +{ + struct expr *rhs; + + if (binop->op != OP_RSHIFT && binop->op != OP_LSHIFT) + return false; + + rhs = binop->right; + if (rhs->etype != EXPR_VALUE || rhs->len > 64) + return false; + + return mpz_get_uint64(rhs->value) == 0; +} + static void relational_binop_postprocess(struct rule_pp_ctx *ctx, struct expr **exprp) { @@ -2421,6 +2435,13 @@ static void relational_binop_postprocess(struct rule_pp_ctx *ctx, */ binop_postprocess(ctx, binop, &binop->left); + if (is_shift_by_zero(binop)) { + struct expr *lhs = binop->left; + + expr_get(lhs); + expr_free(binop); + expr->left = lhs; + } } } |