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authorÁlvaro Neira Ayuso <alvaroneay@gmail.com>2014-06-11 18:51:03 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2014-06-16 11:53:19 +0200
commit34040b1e345c8fa31b1c468713ff7c3815e4a8a1 (patch)
treeba8d928aa811b5de919c94592f3f8f966503662d /src/statement.c
parent11b2bb2fc0652dce73c78e7b0cee5c32c5af80e8 (diff)
reject: add ICMP code parameter for indicating the type of error
This patch allows to indicate the ICMP code field in case that we use to reject. Before, we have always sent network unreachable error as ICMP code, now we can explicitly indicate the ICMP code that we want to use. Examples: nft add rule filter input tcp dport 22 reject with host-unreach nft add rule filter input udp dport 22 reject with host-unreach In this case, it will use the host unreachable code to reject traffic. The default code field still is network unreachable and we can also use the rules without the with like that: nft add rule filter input udp dport 22 reject Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'src/statement.c')
-rw-r--r--src/statement.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/src/statement.c b/src/statement.c
index 2dd3f187..c566fb85 100644
--- a/src/statement.c
+++ b/src/statement.c
@@ -18,6 +18,7 @@
#include <statement.h>
#include <utils.h>
#include <list.h>
+#include <linux/icmp.h>
struct stmt *stmt_alloc(const struct location *loc,
const struct stmt_ops *ops)
@@ -198,7 +199,37 @@ struct stmt *queue_stmt_alloc(const struct location *loc)
static void reject_stmt_print(const struct stmt *stmt)
{
+ const char *icmp_code_name = NULL;
+
printf("reject");
+ if (stmt->reject.type != NFT_REJECT_TCP_RST) {
+ switch (stmt->reject.icmp_code) {
+ case ICMP_NET_UNREACH:
+ icmp_code_name = "net-unreach";
+ break;
+ case ICMP_HOST_UNREACH:
+ icmp_code_name = "host-unreach";
+ break;
+ case ICMP_PROT_UNREACH:
+ icmp_code_name = "prot-unreach";
+ break;
+ case ICMP_PORT_UNREACH:
+ icmp_code_name = "port-unreach";
+ break;
+ case ICMP_NET_ANO:
+ icmp_code_name = "net-prohibited";
+ break;
+ case ICMP_HOST_ANO:
+ icmp_code_name = "host-prohibited";
+ break;
+ case ICMP_PKT_FILTERED:
+ icmp_code_name = "admin-prohibited";
+ break;
+ default:
+ icmp_code_name = "Unknown icmp code";
+ }
+ printf(" with %s", icmp_code_name);
+ }
}
static const struct stmt_ops reject_stmt_ops = {