diff options
| author | Fernando Fernandez Mancera <ffmancera@riseup.net> | 2019-06-22 19:12:08 +0200 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2019-07-17 10:22:39 +0200 |
| commit | 1188a69604c3df2a63daca9e735fdb535e8f6b63 (patch) | |
| tree | 21887d78f5b30023546f40da96aaa4cf256a59e5 /src/json.c | |
| parent | 82cc676289803cfd1e69dfeaa4658d57a1547a86 (diff) | |
src: introduce SYNPROXY matching
Add support for "synproxy" statement. For example (for TCP port 8888):
table ip x {
chain y {
type filter hook prerouting priority raw; policy accept;
tcp dport 8888 tcp flags syn notrack
}
chain z {
type filter hook input priority filter; policy accept;
tcp dport 8888 ct state invalid,untracked synproxy mss 1460 wscale 7 timestamp sack-perm
ct state invalid drop
}
}
Signed-off-by: Fernando Fernandez Mancera <ffmancera@riseup.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'src/json.c')
| -rw-r--r-- | src/json.c | 29 |
1 files changed, 29 insertions, 0 deletions
@@ -16,6 +16,7 @@ #include <linux/netfilter/nf_log.h> #include <linux/netfilter/nf_nat.h> #include <linux/netfilter/nf_tables.h> +#include <linux/netfilter/nf_synproxy.h> #include <linux/xfrm.h> #include <pwd.h> #include <grp.h> @@ -1466,6 +1467,34 @@ json_t *tproxy_stmt_json(const struct stmt *stmt, struct output_ctx *octx) return json_pack("{s:o}", "tproxy", root); } +json_t *synproxy_stmt_json(const struct stmt *stmt, struct output_ctx *octx) +{ + json_t *root = json_object(), *flags = json_array(); + + if (stmt->synproxy.flags & NF_SYNPROXY_OPT_MSS) + json_object_set_new(root, "mss", + json_integer(stmt->synproxy.mss)); + if (stmt->synproxy.flags & NF_SYNPROXY_OPT_WSCALE) + json_object_set_new(root, "wscale", + json_integer(stmt->synproxy.wscale)); + if (stmt->synproxy.flags & NF_SYNPROXY_OPT_TIMESTAMP) + json_array_append_new(flags, json_string("timestamp")); + if (stmt->synproxy.flags & NF_SYNPROXY_OPT_SACK_PERM) + json_array_append_new(flags, json_string("sack-perm")); + + if (json_array_size(flags) > 0) + json_object_set_new(root, "flags", flags); + else + json_decref(flags); + + if (!json_object_size(root)) { + json_decref(root); + root = json_null(); + } + + return json_pack("{s:o}", "synproxy", root); +} + static json_t *table_print_json_full(struct netlink_ctx *ctx, struct table *table) { |