From: Álvaro Neira Ayuso <alvaroneay@xxxxxxxxx> This patch fix the bug: http://bugzilla.netfilter.org/show_bug.cgi?id=924 Before, nftables doesn't permit invert ranges. This patch allows add rules like this: nft add rule ip test input ip daddr != 192.168.1.2-192.168.1.55 or nft add rule ip test input ip daddr == 192.168.1.2-192.168.1.55 Also, we still have the option for adding rules like this: sudo nft add rule ip test output frag id 33-45 Signed-off-by: Alvaro Neira Ayuso <alvaroneay@xxxxxxxxx> --- [changes in v2] * I have added OP_RANGE in netlink_gen_range. I have supposed that always we have a comparison before the range and I have forbidden to add rules with ranges without comparison symbol (== or !=). * I have rewritten the title and the description. src/netlink_linearize.c | 45 +++++++++++++++++++++++++++++++++++++++------ 1 file changed, 39 insertions(+), 6 deletions(-) diff --git a/src/netlink_linearize.c b/src/netlink_linearize.c index e3f06af..19153fd 100644 --- a/src/netlink_linearize.c +++ b/src/netlink_linearize.c @@ -182,6 +182,10 @@ static enum nft_cmp_ops netlink_gen_cmp_op(enum ops op) } } +static void netlink_gen_range(struct netlink_linearize_ctx *ctx, + const struct expr *expr, + enum nft_registers dreg); + static void netlink_gen_cmp(struct netlink_linearize_ctx *ctx, const struct expr *expr, enum nft_registers dreg) @@ -196,7 +200,8 @@ static void netlink_gen_cmp(struct netlink_linearize_ctx *ctx, sreg = get_register(ctx); netlink_gen_expr(ctx, expr->left, sreg); - if (expr->right->ops->type == EXPR_PREFIX) { + switch (expr->right->ops->type) { + case EXPR_PREFIX: { mpz_t mask; mpz_init(mask); @@ -216,7 +221,11 @@ static void netlink_gen_cmp(struct netlink_linearize_ctx *ctx, nft_rule_add_expr(ctx->nlr, nle); right = expr->right->prefix; - } else { + break; + } + case EXPR_RANGE: + return netlink_gen_range(ctx, expr, dreg); + default: right = expr->right; } @@ -247,16 +256,40 @@ static void netlink_gen_range(struct netlink_linearize_ctx *ctx, nle = alloc_nft_expr("cmp"); nft_rule_expr_set_u32(nle, NFT_EXPR_CMP_SREG, sreg); - nft_rule_expr_set_u32(nle, NFT_EXPR_CMP_OP, - netlink_gen_cmp_op(OP_GTE)); + switch (expr->op) { + case OP_NEQ: + nft_rule_expr_set_u32(nle, NFT_EXPR_CMP_OP, + netlink_gen_cmp_op(OP_LT)); + break; + case OP_RANGE: + case OP_EQ: + nft_rule_expr_set_u32(nle, NFT_EXPR_CMP_OP, + netlink_gen_cmp_op(OP_GTE)); + break; + default: + BUG("invalid range operation %u\n", expr->op); + } + netlink_gen_data(range->left, &nld); nft_rule_expr_set(nle, NFT_EXPR_CMP_DATA, nld.value, nld.len); nft_rule_add_expr(ctx->nlr, nle); nle = alloc_nft_expr("cmp"); nft_rule_expr_set_u32(nle, NFT_EXPR_CMP_SREG, sreg); - nft_rule_expr_set_u32(nle, NFT_EXPR_CMP_OP, - netlink_gen_cmp_op(OP_LTE)); + switch (expr->op) { + case OP_NEQ: + nft_rule_expr_set_u32(nle, NFT_EXPR_CMP_OP, + netlink_gen_cmp_op(OP_GT)); + break; + case OP_RANGE: + case OP_EQ: + nft_rule_expr_set_u32(nle, NFT_EXPR_CMP_OP, + netlink_gen_cmp_op(OP_LTE)); + break; + default: + BUG("invalid range operation %u\n", expr->op); + } + netlink_gen_data(range->right, &nld); nft_rule_expr_set(nle, NFT_EXPR_CMP_DATA, nld.value, nld.len); nft_rule_add_expr(ctx->nlr, nle); -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
