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/evaluate.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/evaluate.c')
-rw-r--r-- | src/evaluate.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/evaluate.c b/src/evaluate.c index 864d3daf..55cd9d00 100644 --- a/src/evaluate.c +++ b/src/evaluate.c @@ -17,6 +17,7 @@ #include <linux/netfilter.h> #include <linux/netfilter_arp.h> #include <linux/netfilter/nf_tables.h> +#include <linux/netfilter/nf_synproxy.h> #include <linux/netfilter_ipv4.h> #include <netinet/ip_icmp.h> #include <netinet/icmp6.h> @@ -2746,6 +2747,18 @@ static int stmt_evaluate_tproxy(struct eval_ctx *ctx, struct stmt *stmt) return 0; } +static int stmt_evaluate_synproxy(struct eval_ctx *ctx, struct stmt *stmt) +{ + if (stmt->synproxy.flags != 0 && + !(stmt->synproxy.flags & (NF_SYNPROXY_OPT_MSS | + NF_SYNPROXY_OPT_WSCALE | + NF_SYNPROXY_OPT_TIMESTAMP | + NF_SYNPROXY_OPT_SACK_PERM))) + return stmt_error(ctx, stmt, "This flags are not supported for SYNPROXY"); + + return 0; +} + static int stmt_evaluate_dup(struct eval_ctx *ctx, struct stmt *stmt) { int err; @@ -3090,6 +3103,8 @@ int stmt_evaluate(struct eval_ctx *ctx, struct stmt *stmt) return stmt_evaluate_objref(ctx, stmt); case STMT_MAP: return stmt_evaluate_map(ctx, stmt); + case STMT_SYNPROXY: + return stmt_evaluate_synproxy(ctx, stmt); default: BUG("unknown statement type %s\n", stmt->ops->name); } |