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bh=40y7XnMkkeXrf07K1VSPgkl2+LDrg9qNQQfiNfet+Rs=; b=yYxXXkejhpV4DEiPgg0IldCmlTzIsk650IjBkY2DUkucFHWUIaQjIfQ9KzXdOtzDaJJd8A Y41dAL0C1M3NJSC6hy4/nzpRWxB2VioRwBt33a7Z7008BxKWZ5JXNpdK1aB9gRYdRLc4ft t1pPTdq7rNLsnvFKvBz3cAWr4etYoVu5KnHiEDXV2S4/hXOfMh90c6P53UYShNqH6I7WbC cR1OFD7nEPiKOPCXER4a0enkk0X+jt0938qRCSADaUy0989F7X9P/Nfy295SFGok9FAahG SzJjEjXp9yDTBJwI0KqpyVAlT2K2thyxnaIS4bbZcupUCFuqmJ45pnqEZlnj/Q== From: Ralf Lici To: openvpn-devel@lists.sourceforge.net Date: Fri, 15 May 2026 09:59:39 +0200 Message-ID: <20260515075941.102225-3-ralf@mandelbit.com> In-Reply-To: <20260515075941.102225-1-ralf@mandelbit.com> References: <20260515075941.102225-1-ralf@mandelbit.com> MIME-Version: 1.0 X-Spam-Score: -0.2 (/) X-Spam-Report: Spam detection software, running on the system "sfi-spamd-1.hosts.colo.sdot.me", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Extend ovpn-cli set_peer to pass the peer mssfix attribute. Use -1 as the selftest CLI sentinel for leaving mssfix unchanged, so existing timeout-only peer updates can keep omitting the netlink attrib [...] Content analysis details: (-0.2 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain X-Headers-End: 1wNnTT-0004EK-Ij Subject: [Openvpn-devel] [PATCH ovpn net-next 3/3] selftests: ovpn: add mssfix coverage X-BeenThere: openvpn-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: openvpn-devel-bounces@lists.sourceforge.net X-getmail-retrieved-from-mailbox: Inbox X-GMAIL-THRID: =?utf-8?q?1865240613621500504?= X-GMAIL-MSGID: =?utf-8?q?1865240613621500504?= Extend ovpn-cli set_peer to pass the peer mssfix attribute. Use -1 as the selftest CLI sentinel for leaving mssfix unchanged, so existing timeout-only peer updates can keep omitting the netlink attribute. Add an ovpn test stage that configures mssfix on each side of a peer pair and verifies the MSS advertised on TCP SYN packets seen on the tunnel device. This covers both TX-side and RX-side clamping, and also checks that an invalid non-zero MSS value is rejected. Signed-off-by: Ralf Lici --- tools/testing/selftests/net/ovpn/ovpn-cli.c | 19 ++++- .../selftests/net/ovpn/test-close-socket.sh | 4 +- tools/testing/selftests/net/ovpn/test-mark.sh | 4 +- tools/testing/selftests/net/ovpn/test.sh | 75 +++++++++++++++++-- 4 files changed, 89 insertions(+), 13 deletions(-) diff --git a/tools/testing/selftests/net/ovpn/ovpn-cli.c b/tools/testing/selftests/net/ovpn/ovpn-cli.c index d40953375c86..ca992a7cee3d 100644 --- a/tools/testing/selftests/net/ovpn/ovpn-cli.c +++ b/tools/testing/selftests/net/ovpn/ovpn-cli.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include #include @@ -129,6 +130,7 @@ struct ovpn_ctx { __u32 keepalive_interval; __u32 keepalive_timeout; + int mssfix; enum ovpn_key_direction key_dir; enum ovpn_key_slot key_slot; @@ -732,6 +734,8 @@ static int ovpn_set_peer(struct ovpn_ctx *ovpn) ovpn->keepalive_interval); NLA_PUT_U32(ctx->nl_msg, OVPN_A_PEER_KEEPALIVE_TIMEOUT, ovpn->keepalive_timeout); + if (ovpn->mssfix >= 0) + NLA_PUT_U16(ctx->nl_msg, OVPN_A_PEER_MSSFIX, ovpn->mssfix); nla_nest_end(ctx->nl_msg, attr); ret = ovpn_nl_msg_send(ctx, NULL); @@ -1730,13 +1734,15 @@ static void usage(const char *cmd) fprintf(stderr, "\tmark: socket FW mark value\n"); fprintf(stderr, - "* set_peer : set peer attributes\n"); + "* set_peer : set peer attributes\n"); fprintf(stderr, "\tiface: ovpn interface name\n"); fprintf(stderr, "\tpeer_id: peer ID of the peer to modify\n"); fprintf(stderr, "\tkeepalive_interval: interval for sending ping messages\n"); fprintf(stderr, "\tkeepalive_timeout: time after which a peer is timed out\n"); + fprintf(stderr, + "\tmssfix: TCP MSS value to clamp SYN packets to (0 disables, -1 leaves unchanged)\n"); fprintf(stderr, "* del_peer : delete peer\n"); fprintf(stderr, "\tiface: ovpn interface name\n"); @@ -2307,7 +2313,7 @@ static int ovpn_parse_cmd_args(struct ovpn_ctx *ovpn, int argc, char *argv[]) } break; case CMD_SET_PEER: - if (argc < 6) + if (argc < 7) return -EINVAL; ovpn->peer_id = strtoul(argv[3], NULL, 10); @@ -2329,6 +2335,14 @@ static int ovpn_parse_cmd_args(struct ovpn_ctx *ovpn, int argc, char *argv[]) "keepalive interval value out of range\n"); return -1; } + + errno = 0; + ovpn->mssfix = strtol(argv[6], NULL, 10); + if (errno == ERANGE || ovpn->mssfix < -1 || + ovpn->mssfix > UINT16_MAX) { + fprintf(stderr, "mssfix value out of range\n"); + return -1; + } break; case CMD_DEL_PEER: if (argc < 4) @@ -2442,6 +2456,7 @@ int main(int argc, char *argv[]) memset(&ovpn, 0, sizeof(ovpn)); ovpn.sa_family = AF_UNSPEC; ovpn.cipher = OVPN_CIPHER_ALG_NONE; + ovpn.mssfix = -1; ovpn.cmd = ovpn_parse_cmd(argv[1]); if (ovpn.cmd == CMD_INVALID) { diff --git a/tools/testing/selftests/net/ovpn/test-close-socket.sh b/tools/testing/selftests/net/ovpn/test-close-socket.sh index af1532b4d2da..091c0103bdba 100755 --- a/tools/testing/selftests/net/ovpn/test-close-socket.sh +++ b/tools/testing/selftests/net/ovpn/test-close-socket.sh @@ -41,10 +41,10 @@ ovpn_prepare_network() { peer_ns="ovpn_peer${p}" ovpn_cmd_ok "set peer0 timeout for peer ${p}" \ ip netns exec ovpn_peer0 ${OVPN_CLI} set_peer tun0 \ - ${p} 60 120 + ${p} 60 120 -1 ovpn_cmd_ok "set peer${p} timeout for peer ${p}" \ ip netns exec "${peer_ns}" ${OVPN_CLI} set_peer \ - tun${p} $((p + OVPN_ID_OFFSET)) 60 120 + tun${p} $((p + OVPN_ID_OFFSET)) 60 120 -1 done } diff --git a/tools/testing/selftests/net/ovpn/test-mark.sh b/tools/testing/selftests/net/ovpn/test-mark.sh index 5a8f47554286..11af23beea2a 100755 --- a/tools/testing/selftests/net/ovpn/test-mark.sh +++ b/tools/testing/selftests/net/ovpn/test-mark.sh @@ -54,10 +54,10 @@ ovpn_mark_prepare_network() { peer_ns="ovpn_peer${p}" ovpn_cmd_ok "set peer0 timeout for peer ${p}" \ ip netns exec ovpn_peer0 "${OVPN_CLI}" set_peer tun0 \ - "${p}" 60 120 + "${p}" 60 120 -1 ovpn_cmd_ok "set peer${p} timeout for peer ${p}" \ ip netns exec "${peer_ns}" "${OVPN_CLI}" set_peer \ - tun"${p}" $((p + OVPN_ID_OFFSET)) 60 120 + tun"${p}" $((p + OVPN_ID_OFFSET)) 60 120 -1 done } diff --git a/tools/testing/selftests/net/ovpn/test.sh b/tools/testing/selftests/net/ovpn/test.sh index c06e3135fbef..a0630034351a 100755 --- a/tools/testing/selftests/net/ovpn/test.sh +++ b/tools/testing/selftests/net/ovpn/test.sh @@ -49,10 +49,10 @@ ovpn_prepare_network() { peer_ns="ovpn_peer${p}" ovpn_cmd_ok "set peer0 timeout for peer ${p}" \ ip netns exec ovpn_peer0 ${OVPN_CLI} set_peer tun0 \ - ${p} 60 120 + ${p} 60 120 -1 ovpn_cmd_ok "set peer${p} timeout for peer ${p}" \ ip netns exec "${peer_ns}" ${OVPN_CLI} set_peer \ - tun${p} $((p + OVPN_ID_OFFSET)) 60 120 + tun${p} $((p + OVPN_ID_OFFSET)) 60 120 -1 done } @@ -142,6 +142,66 @@ ovpn_run_iperf() { wait "${iperf_pid}" || return 1 } +ovpn_run_mssfix_flow() { + local filter + local iperf_pid + local direction="$1" + local mssfix="$2" + local tcpdump_pid + + filter="tcp and src host 5.5.5.1 and dst host 5.5.5.2" + filter="${filter} and tcp[tcpflags] & tcp-syn != 0" + + ovpn_run_bg iperf_pid ip netns exec ovpn_peer1 iperf3 -1 -s + sleep 1 + + timeout 3s ip netns exec ovpn_peer1 tcpdump --immediate-mode -l -p \ + -vv -nn -i tun1 -c 1 "${filter}" 2>&1 | + grep -iq "mss ${mssfix}" & + tcpdump_pid=$! + sleep 0.3 + + ovpn_cmd_ok "run ${direction} mssfix TCP flow" \ + ip netns exec ovpn_peer0 iperf3 -t 1 -c 5.5.5.2 + + ovpn_cmd_ok "capture ${direction} mssfix TCP SYN" wait "${tcpdump_pid}" + ovpn_cmd_ok "finish ${direction} mssfix TCP server" wait "${iperf_pid}" +} + +ovpn_run_mssfix() { + local peer0_id=$((1 + OVPN_ID_OFFSET)) + + # peer0 will clamp MSS for packets exchanged with peer1 + ovpn_cmd_ok "set peer0 mssfix for peer 1" \ + ip netns exec ovpn_peer0 ${OVPN_CLI} set_peer tun0 1 \ + 60 120 900 + + ovpn_cmd_fail "reject invalid peer0 mssfix for peer 1" \ + ip netns exec ovpn_peer0 ${OVPN_CLI} set_peer tun0 1 \ + 60 120 20 + + ovpn_cmd_ok "clear peer1 mssfix for peer ${peer0_id}" \ + ip netns exec ovpn_peer1 ${OVPN_CLI} set_peer tun1 \ + "${peer0_id}" 60 120 0 + + ovpn_run_mssfix_flow "TX" 900 + + ovpn_cmd_ok "clear peer0 mssfix for peer 1" \ + ip netns exec ovpn_peer0 ${OVPN_CLI} set_peer tun0 1 \ + 60 120 0 + + # peer1 will clamp MSS for packets exchanged with peer0 + ovpn_cmd_ok "set peer1 mssfix for peer ${peer0_id}" \ + ip netns exec ovpn_peer1 ${OVPN_CLI} set_peer tun1 \ + "${peer0_id}" 60 120 901 + + ovpn_run_mssfix_flow "RX" 901 + + ovpn_cmd_ok "clear peer1 mssfix for peer ${peer0_id}" \ + ip netns exec ovpn_peer1 ${OVPN_CLI} set_peer tun1 \ + "${peer0_id}" 60 120 0 +} + ovpn_run_key_rollover() { local p local peer_ns @@ -259,11 +319,11 @@ ovpn_run_timeouts() { # Non-fatal: this may fail in some protocol modes. ovpn_cmd_mayfail "set peer0 timeout for peer ${p} (non-fatal)" \ ip netns exec ovpn_peer0 ${OVPN_CLI} set_peer tun0 \ - ${p} 3 3 + ${p} 3 3 -1 peer_ns="ovpn_peer${p}" ovpn_cmd_ok "disable timeout on peer${p} while peer0 adjusts \ state" ip netns exec "${peer_ns}" ${OVPN_CLI} set_peer \ - tun${p} $((p + OVPN_ID_OFFSET)) 0 0 + tun${p} $((p + OVPN_ID_OFFSET)) 0 0 -1 done # wait for peers to timeout sleep 5 @@ -274,7 +334,7 @@ ovpn_run_timeouts() { peer_ns="ovpn_peer${p}" ovpn_cmd_ok "set peer${p} P2P timeout" \ ip netns exec "${peer_ns}" ${OVPN_CLI} set_peer \ - tun${p} $((p + OVPN_ID_OFFSET)) 3 3 + tun${p} $((p + OVPN_ID_OFFSET)) 3 3 -1 done sleep 5 } @@ -293,9 +353,9 @@ trap ovpn_stage_err ERR ktap_print_header if [ "${OVPN_FLOAT}" == "1" ]; then - ktap_set_plan 13 + ktap_set_plan 14 else - ktap_set_plan 12 + ktap_set_plan 13 fi ovpn_cleanup @@ -307,6 +367,7 @@ ovpn_run_stage "run LAN traffic behind peer1" ovpn_run_lan_traffic [ "${OVPN_FLOAT}" == "1" ] && ovpn_run_stage "run floating peer checks" \ ovpn_run_float_mode ovpn_run_stage "run iperf throughput" ovpn_run_iperf +ovpn_run_stage "run mssfix TCP SYN clamp" ovpn_run_mssfix ovpn_run_stage "run key rollout" ovpn_run_key_rollover ovpn_run_stage "query peers" ovpn_run_queries ovpn_run_stage "query missing peer fails" ovpn_query_peer_missing