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/netlink_linearize.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/netlink_linearize.c')
-rw-r--r-- | src/netlink_linearize.c | 17 |
1 files changed, 17 insertions, 0 deletions
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: |