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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Shuah Khan , netdev@vger.kernel.org, lvs-devel@vger.kernel.org, netfilter-devel@vger.kernel.org, Adriano Cordova Subject: [PATCH v2 0/4] ipvs: add per-service secure_tcp Date: Tue, 15 Sep 2026 19:41:00 -0300 Message-ID: <20260915224104.639985-1-adrianox@gmail.com> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: netfilter-devel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit IPVS currently exposes secure_tcp as a per-netns sysctl. It switches the TCP state machine to the hardened tcp_states_dos table. These patches make it per-service: a virtual service can set IP_VS_SVC_F_SECURE_TCP which is passed into IP_VS_CONN_F_SECURE_TCP at connection creation. set_tcp_state() then selects tcp_states_dos for those connections with IP_VS_CONN_F_SECURE_TCP set and keeps pd->tcp_state_table (the netns default, including the nomem floor) otherwise. 1. uapi: define the per-service secure_tcp flags 2. stamp the flag in ip_vs_bind_dest() (cache-bypass has no dest) 3. honor it in the TCP state machine, resolving the stale FIXME 4. kselftest contrasting a secure vs. a plain service Changes in v2: - Let IP_VS_SVC_F_SECURE_TCP be 0x0100, leaving 0x0040/0x0080 for the scheduler flags. Let IP_VS_CONN_F_SECURE_TCP be (1 << 17) and no longer in IP_VS_CONN_F_BACKUP_MASK. - Set flag in ip_vs_bind_dest() instead of at every ip_vs_conn_new() call site. - selftest: send probes with TTL=1 instead of an nft drop, and fix Sashiko comments. Not sure about patch 4... could be dropped or absorbed into ipvs.sh Adriano Cordova (4): ipvs: add flags for per-service secure TCP state table ipvs: stamp per-service secure_tcp on connections ipvs: tcp: enable per-connection secure_tcp in state machine selftests: netfilter: ipvs: add per-service secure_tcp test include/uapi/linux/ip_vs.h | 2 + net/netfilter/ipvs/ip_vs_conn.c | 4 + net/netfilter/ipvs/ip_vs_core.c | 3 + net/netfilter/ipvs/ip_vs_proto_tcp.c | 16 +- .../testing/selftests/net/netfilter/Makefile | 6 + .../selftests/net/netfilter/gen_tcp_probe.c | 141 ++++++++ .../net/netfilter/ipvs_secure_tcp.sh | 153 +++++++++ .../net/netfilter/ipvs_secure_tcp_mln.c | 323 ++++++++++++++++++ 8 files changed, 641 insertions(+), 7 deletions(-) create mode 100644 tools/testing/selftests/net/netfilter/gen_tcp_probe.c create mode 100755 tools/testing/selftests/net/netfilter/ipvs_secure_tcp.sh create mode 100644 tools/testing/selftests/net/netfilter/ipvs_secure_tcp_mln.c -- 2.51.0