From 5fdd0b6a0600e66f9ff6d9a1d6b749aa68a3ba99 Mon Sep 17 00:00:00 2001 From: Alvaro Neira Date: Tue, 30 Sep 2014 17:21:40 +0200 Subject: nft: complete reject support This patch allows to use the reject action in rules. For example: nft add rule filter input udp dport 22 reject In this rule, we assume that the reason is network unreachable. Also we can specify the reason with the option "with" and the reason. For example: nft add rule filter input tcp dport 22 reject with icmp type host-unreachable In the bridge tables and inet tables, we can use this action too. For example: nft add rule inet filter input reject with icmp type host-unreachable In this rule above, this generates a meta nfproto dependency to match ipv4 traffic because we use a icmpv4 reason to reject. If the reason is not specified, we infer it from the context. Moreover, we have the new icmpx datatype. You can use this datatype for the bridge and the inet tables to simplify your ruleset. For example: nft add rule inet filter input reject with icmpx type host-unreachable We have four icmpx reason and the mapping is: ICMPX reason | ICMPv6 | ICMPv4 | | admin-prohibited | admin-prohibited | admin-prohibited port-unreachable | port-unreachable | port-unreachable no-route | no-route | net-unreachable host-unreachable | addr-unreachable | host-unreachable Signed-off-by: Alvaro Neira Ayuso Signed-off-by: Pablo Neira Ayuso --- src/netlink_linearize.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'src/netlink_linearize.c') diff --git a/src/netlink_linearize.c b/src/netlink_linearize.c index c46b6d47..29f8e9ae 100644 --- a/src/netlink_linearize.c +++ b/src/netlink_linearize.c @@ -612,7 +612,10 @@ static void netlink_gen_reject_stmt(struct netlink_linearize_ctx *ctx, nle = alloc_nft_expr("reject"); nft_rule_expr_set_u32(nle, NFT_EXPR_REJECT_TYPE, stmt->reject.type); - nft_rule_expr_set_u8(nle, NFT_EXPR_REJECT_CODE, 0); + if (stmt->reject.icmp_code != -1) + nft_rule_expr_set_u8(nle, NFT_EXPR_REJECT_CODE, + stmt->reject.icmp_code); + nft_rule_add_expr(ctx->nlr, nle); } -- cgit v1.2.3