From 1188a69604c3df2a63daca9e735fdb535e8f6b63 Mon Sep 17 00:00:00 2001 From: Fernando Fernandez Mancera Date: Sat, 22 Jun 2019 19:12:08 +0200 Subject: 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 Signed-off-by: Pablo Neira Ayuso --- src/netlink_linearize.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'src/netlink_linearize.c') diff --git a/src/netlink_linearize.c b/src/netlink_linearize.c index 2c6aa64d..498326d0 100644 --- a/src/netlink_linearize.c +++ b/src/netlink_linearize.c @@ -1141,6 +1141,21 @@ static void netlink_gen_tproxy_stmt(struct netlink_linearize_ctx *ctx, nftnl_rule_add_expr(ctx->nlr, nle); } +static void netlink_gen_synproxy_stmt(struct netlink_linearize_ctx *ctx, + const struct stmt *stmt) +{ + struct nftnl_expr *nle; + + nle = alloc_nft_expr("synproxy"); + nftnl_expr_set_u16(nle, NFTNL_EXPR_SYNPROXY_MSS, stmt->synproxy.mss); + nftnl_expr_set_u8(nle, NFTNL_EXPR_SYNPROXY_WSCALE, + stmt->synproxy.wscale); + nftnl_expr_set_u32(nle, NFTNL_EXPR_SYNPROXY_FLAGS, + stmt->synproxy.flags); + + nftnl_rule_add_expr(ctx->nlr, nle); +} + static void netlink_gen_dup_stmt(struct netlink_linearize_ctx *ctx, const struct stmt *stmt) { @@ -1382,6 +1397,8 @@ static void netlink_gen_stmt(struct netlink_linearize_ctx *ctx, return netlink_gen_nat_stmt(ctx, stmt); case STMT_TPROXY: return netlink_gen_tproxy_stmt(ctx, stmt); + case STMT_SYNPROXY: + return netlink_gen_synproxy_stmt(ctx, stmt); case STMT_DUP: return netlink_gen_dup_stmt(ctx, stmt); case STMT_QUEUE: -- cgit v1.2.3