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_delinearize.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'src/netlink_delinearize.c') diff --git a/src/netlink_delinearize.c b/src/netlink_delinearize.c index 1dd3ffd1..fc2574b1 100644 --- a/src/netlink_delinearize.c +++ b/src/netlink_delinearize.c @@ -1010,6 +1010,22 @@ out_err: xfree(stmt); } +static void netlink_parse_synproxy(struct netlink_parse_ctx *ctx, + const struct location *loc, + const struct nftnl_expr *nle) +{ + struct stmt *stmt; + + stmt = synproxy_stmt_alloc(loc); + stmt->synproxy.mss = nftnl_expr_get_u16(nle, NFTNL_EXPR_SYNPROXY_MSS); + stmt->synproxy.wscale = nftnl_expr_get_u8(nle, + NFTNL_EXPR_SYNPROXY_WSCALE); + stmt->synproxy.flags = nftnl_expr_get_u32(nle, + NFTNL_EXPR_SYNPROXY_FLAGS); + + ctx->stmt = stmt; +} + static void netlink_parse_tproxy(struct netlink_parse_ctx *ctx, const struct location *loc, const struct nftnl_expr *nle) @@ -1476,6 +1492,7 @@ static const struct { { .name = "tcpopt", .parse = netlink_parse_exthdr }, { .name = "flow_offload", .parse = netlink_parse_flow_offload }, { .name = "xfrm", .parse = netlink_parse_xfrm }, + { .name = "synproxy", .parse = netlink_parse_synproxy }, }; static int netlink_parse_expr(const struct nftnl_expr *nle, -- cgit v1.2.3