From patchwork Mon Oct 14 14:06:00 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Matthieu Baerts \(NGI0\)" X-Patchwork-Id: 835277 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2DEDC1AC45F; Mon, 14 Oct 2024 14:06:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728914812; cv=none; b=fj7xHS3mgSmDjPQ0yCc7YEwd+Si9kB43Tdo5GBGcsaVIgCs8R5NWC13CIPHg8I1+NWHTHKPI40yNfBkeBlI1dIpaRJsqpfoj+pQVXCHgQ8TMEKz9dutR+YMvRgDVPz13FmvEyOFD1NA9RI8s9sNk7uYSoL1jRuZRglcaWMlXBEk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728914812; c=relaxed/simple; bh=4rFBOgxbRxsGSItMVxpTTzO12dDwFek2/2aDpf+2Uh8=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=iVWVUF5uJQFZS8diZPTRuTZ/DvLcZ4TWQ8la8X7b8yw9tAPhEdP2MmjPRezy+24RqRkXKtcLm0rSfi6yGDwQKVFjH4MfUnwFfWAmAweyZCaB+aOOc0RgPexJeKVs/vpQA6kfBz7IS+VeW/6GQlTQlJWRscRqiFhNQQBAP+Ifkm8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=kLFM+t4W; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="kLFM+t4W" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BDFB4C4CEC6; Mon, 14 Oct 2024 14:06:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1728914811; bh=4rFBOgxbRxsGSItMVxpTTzO12dDwFek2/2aDpf+2Uh8=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=kLFM+t4WsT3A+MtZiQRnQM8GPLsOtEDyKzXG21x5DuiDLp8Ms8PThb0swhh6mc3vn pa25GoGJFfAcrGz7k3EIUe7bzPRuSohORG1+Hs99pnwvFlh0WY5VixE7CM8VCj+83p 1dCYrUPLperbsKbFe90JcgsQIac5DNi24EaMyz+LLx+JdiSyuzjtUyq3iXZ8KtNWpO XkgKJ5I1mv6uLo8LBmhsfWo3DrZpC0qxX6I7QdKLK40bGstSxAV1uCQxMWd6GGu4OQ 0h321UAvwpYeA83V4xF+dRjI4UM62bEgSFD5vVAXHP7y2NJ5cvdiKnf5qThIK6Aj0q l/c63/CZA66Eg== From: "Matthieu Baerts (NGI0)" Date: Mon, 14 Oct 2024 16:06:00 +0200 Subject: [PATCH net v2 1/2] mptcp: prevent MPC handshake on port-based signal endpoints Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241014-net-mptcp-mpc-port-endp-v2-1-7faea8e6b6ae@kernel.org> References: <20241014-net-mptcp-mpc-port-endp-v2-0-7faea8e6b6ae@kernel.org> In-Reply-To: <20241014-net-mptcp-mpc-port-endp-v2-0-7faea8e6b6ae@kernel.org> To: mptcp@lists.linux.dev, Mat Martineau , Geliang Tang , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Shuah Khan Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Cong Wang , "Matthieu Baerts (NGI0)" , stable@vger.kernel.org, syzbot+f4aacdfef2c6a6529c3e@syzkaller.appspotmail.com X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=12029; i=matttbe@kernel.org; h=from:subject:message-id; bh=n0ptyci1csBA/gH5/LyBQXyU/aNH+nz6jWKLh20Ti7U=; b=owEBbQKS/ZANAwAIAfa3gk9CaaBzAcsmYgBnDSV0YpPvplI2XYwyN9P52fx1YJPxMgNRJRmak BcukA7cK3WJAjMEAAEIAB0WIQToy4X3aHcFem4n93r2t4JPQmmgcwUCZw0ldAAKCRD2t4JPQmmg c/k6EACDQzdJ1B4LjkPrKTM0IlO4HnWMGFfY+wQiS2/tRCz7HeVWzaR9q95aDz0dI5ik2r34DEA kNKH657hX1mFQIngEH5KHUh4bLDQm7ewSSrs9dEztSuk+hov6XRCWsLKHcvqJ4tH8oQB8jrXAQE ZuNQuB0A1wRpbwsqi/x1ygHle83jV6dwmf/THrk4eUg9e3+jcI7B63/xX20svWzLOIc3VDfCTCP uOjOpeTQRJ4Pb+zbkLnFcLarzFGN5+lqp89vlh7ngwQbO5+u3U94yHCbOOl99ejgrsJ2tx0IHAb 7Syb4HYkJznathMmNnGyksJgR2lS/z4+LoAUl/mtTI9/bVMvgPlD3KAtIwVnoGT3kHdAeOA6KH1 nK3tPvAJbHO8h+xP2jQKZbXcsVyKoGe+jXPyozAN2SZGIB16Gdeer6XWPeIwRP1fqYnq2YTQRI1 ddKNcTbluEvlZVdTJx2FLJmrkGmrpV2zovR/U9bVZDkx5OEt8CJ5+auEDP8YXvMJc94dw4y21t+ +kmgqK8yl1Ak1wlzlhil+v1b/eMh0ifDq0IfYN+eNmIYLvsPE/OCftMuJu3Ugg5IHRKqgvvCUvw mF/WEeVnavI8yhChxo3R3tlyfGl+GfPl2bOYLSte80S6XYGK4ueDWXXysq6k1xSm2CKzeg0lGB1 0ZhzJdl9/2YfkvQ== X-Developer-Key: i=matttbe@kernel.org; a=openpgp; fpr=E8CB85F76877057A6E27F77AF6B7824F4269A073 From: Paolo Abeni Syzkaller reported a lockdep splat: ============================================ WARNING: possible recursive locking detected 6.11.0-rc6-syzkaller-00019-g67784a74e258 #0 Not tainted -------------------------------------------- syz-executor364/5113 is trying to acquire lock: ffff8880449f1958 (k-slock-AF_INET){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff8880449f1958 (k-slock-AF_INET){+.-.}-{2:2}, at: sk_clone_lock+0x2cd/0xf40 net/core/sock.c:2328 but task is already holding lock: ffff88803fe3cb58 (k-slock-AF_INET){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff88803fe3cb58 (k-slock-AF_INET){+.-.}-{2:2}, at: sk_clone_lock+0x2cd/0xf40 net/core/sock.c:2328 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(k-slock-AF_INET); lock(k-slock-AF_INET); *** DEADLOCK *** May be due to missing lock nesting notation 7 locks held by syz-executor364/5113: #0: ffff8880449f0e18 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1607 [inline] #0: ffff8880449f0e18 (sk_lock-AF_INET){+.+.}-{0:0}, at: mptcp_sendmsg+0x153/0x1b10 net/mptcp/protocol.c:1806 #1: ffff88803fe39ad8 (k-sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1607 [inline] #1: ffff88803fe39ad8 (k-sk_lock-AF_INET){+.+.}-{0:0}, at: mptcp_sendmsg_fastopen+0x11f/0x530 net/mptcp/protocol.c:1727 #2: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline] #2: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #2: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: __ip_queue_xmit+0x5f/0x1b80 net/ipv4/ip_output.c:470 #3: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline] #3: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #3: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: ip_finish_output2+0x45f/0x1390 net/ipv4/ip_output.c:228 #4: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: local_lock_acquire include/linux/local_lock_internal.h:29 [inline] #4: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: process_backlog+0x33b/0x15b0 net/core/dev.c:6104 #5: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline] #5: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #5: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: ip_local_deliver_finish+0x230/0x5f0 net/ipv4/ip_input.c:232 #6: ffff88803fe3cb58 (k-slock-AF_INET){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] #6: ffff88803fe3cb58 (k-slock-AF_INET){+.-.}-{2:2}, at: sk_clone_lock+0x2cd/0xf40 net/core/sock.c:2328 stack backtrace: CPU: 0 UID: 0 PID: 5113 Comm: syz-executor364 Not tainted 6.11.0-rc6-syzkaller-00019-g67784a74e258 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 check_deadlock kernel/locking/lockdep.c:3061 [inline] validate_chain+0x15d3/0x5900 kernel/locking/lockdep.c:3855 __lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5142 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] sk_clone_lock+0x2cd/0xf40 net/core/sock.c:2328 mptcp_sk_clone_init+0x32/0x13c0 net/mptcp/protocol.c:3279 subflow_syn_recv_sock+0x931/0x1920 net/mptcp/subflow.c:874 tcp_check_req+0xfe4/0x1a20 net/ipv4/tcp_minisocks.c:853 tcp_v4_rcv+0x1c3e/0x37f0 net/ipv4/tcp_ipv4.c:2267 ip_protocol_deliver_rcu+0x22e/0x440 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x341/0x5f0 net/ipv4/ip_input.c:233 NF_HOOK+0x3a4/0x450 include/linux/netfilter.h:314 NF_HOOK+0x3a4/0x450 include/linux/netfilter.h:314 __netif_receive_skb_one_core net/core/dev.c:5661 [inline] __netif_receive_skb+0x2bf/0x650 net/core/dev.c:5775 process_backlog+0x662/0x15b0 net/core/dev.c:6108 __napi_poll+0xcb/0x490 net/core/dev.c:6772 napi_poll net/core/dev.c:6841 [inline] net_rx_action+0x89b/0x1240 net/core/dev.c:6963 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 do_softirq+0x11b/0x1e0 kernel/softirq.c:455 __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:908 [inline] __dev_queue_xmit+0x1763/0x3e90 net/core/dev.c:4450 dev_queue_xmit include/linux/netdevice.h:3105 [inline] neigh_hh_output include/net/neighbour.h:526 [inline] neigh_output include/net/neighbour.h:540 [inline] ip_finish_output2+0xd41/0x1390 net/ipv4/ip_output.c:235 ip_local_out net/ipv4/ip_output.c:129 [inline] __ip_queue_xmit+0x118c/0x1b80 net/ipv4/ip_output.c:535 __tcp_transmit_skb+0x2544/0x3b30 net/ipv4/tcp_output.c:1466 tcp_rcv_synsent_state_process net/ipv4/tcp_input.c:6542 [inline] tcp_rcv_state_process+0x2c32/0x4570 net/ipv4/tcp_input.c:6729 tcp_v4_do_rcv+0x77d/0xc70 net/ipv4/tcp_ipv4.c:1934 sk_backlog_rcv include/net/sock.h:1111 [inline] __release_sock+0x214/0x350 net/core/sock.c:3004 release_sock+0x61/0x1f0 net/core/sock.c:3558 mptcp_sendmsg_fastopen+0x1ad/0x530 net/mptcp/protocol.c:1733 mptcp_sendmsg+0x1884/0x1b10 net/mptcp/protocol.c:1812 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x1a6/0x270 net/socket.c:745 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2597 ___sys_sendmsg net/socket.c:2651 [inline] __sys_sendmmsg+0x3b2/0x740 net/socket.c:2737 __do_sys_sendmmsg net/socket.c:2766 [inline] __se_sys_sendmmsg net/socket.c:2763 [inline] __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2763 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f04fb13a6b9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 01 1a 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd651f42d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f04fb13a6b9 RDX: 0000000000000001 RSI: 0000000020000d00 RDI: 0000000000000004 RBP: 00007ffd651f4310 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000020000080 R11: 0000000000000246 R12: 00000000000f4240 R13: 00007f04fb187449 R14: 00007ffd651f42f4 R15: 00007ffd651f4300 As noted by Cong Wang, the splat is false positive, but the code path leading to the report is an unexpected one: a client is attempting an MPC handshake towards the in-kernel listener created by the in-kernel PM for a port based signal endpoint. Such connection will be never accepted; many of them can make the listener queue full and preventing the creation of MPJ subflow via such listener - its intended role. Explicitly detect this scenario at initial-syn time and drop the incoming MPC request. Fixes: 1729cf186d8a ("mptcp: create the listening socket for new port") Cc: stable@vger.kernel.org Reported-by: syzbot+f4aacdfef2c6a6529c3e@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=f4aacdfef2c6a6529c3e Cc: Cong Wang Signed-off-by: Paolo Abeni Reviewed-by: Matthieu Baerts (NGI0) Reviewed-by: Mat Martineau Signed-off-by: Matthieu Baerts (NGI0) --- net/mptcp/mib.c | 1 + net/mptcp/mib.h | 1 + net/mptcp/pm_netlink.c | 1 + net/mptcp/protocol.h | 1 + net/mptcp/subflow.c | 11 +++++++++++ 5 files changed, 15 insertions(+) diff --git a/net/mptcp/mib.c b/net/mptcp/mib.c index ad88bd3c58dffed8335eedb43ca6290418e3c4f4..19eb9292bd6093a760b41f98c1774fd2490c48e3 100644 --- a/net/mptcp/mib.c +++ b/net/mptcp/mib.c @@ -17,6 +17,7 @@ static const struct snmp_mib mptcp_snmp_list[] = { SNMP_MIB_ITEM("MPCapableFallbackSYNACK", MPTCP_MIB_MPCAPABLEACTIVEFALLBACK), SNMP_MIB_ITEM("MPCapableSYNTXDrop", MPTCP_MIB_MPCAPABLEACTIVEDROP), SNMP_MIB_ITEM("MPCapableSYNTXDisabled", MPTCP_MIB_MPCAPABLEACTIVEDISABLED), + SNMP_MIB_ITEM("MPCapableEndpAttempt", MPTCP_MIB_MPCAPABLEENDPATTEMPT), SNMP_MIB_ITEM("MPFallbackTokenInit", MPTCP_MIB_TOKENFALLBACKINIT), SNMP_MIB_ITEM("MPTCPRetrans", MPTCP_MIB_RETRANSSEGS), SNMP_MIB_ITEM("MPJoinNoTokenFound", MPTCP_MIB_JOINNOTOKEN), diff --git a/net/mptcp/mib.h b/net/mptcp/mib.h index 3206cdda8bb1067f9a8354fd45deed86b67ac7da..128282982843a07614a46f9b2c2f7c708306c769 100644 --- a/net/mptcp/mib.h +++ b/net/mptcp/mib.h @@ -12,6 +12,7 @@ enum linux_mptcp_mib_field { MPTCP_MIB_MPCAPABLEACTIVEFALLBACK, /* Client-side fallback during 3-way handshake */ MPTCP_MIB_MPCAPABLEACTIVEDROP, /* Client-side fallback due to a MPC drop */ MPTCP_MIB_MPCAPABLEACTIVEDISABLED, /* Client-side disabled due to past issues */ + MPTCP_MIB_MPCAPABLEENDPATTEMPT, /* Prohibited MPC to port-based endp */ MPTCP_MIB_TOKENFALLBACKINIT, /* Could not init/allocate token */ MPTCP_MIB_RETRANSSEGS, /* Segments retransmitted at the MPTCP-level */ MPTCP_MIB_JOINNOTOKEN, /* Received MP_JOIN but the token was not found */ diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c index f6f0a38a0750f82bc909f02a75beec980d951f1f..1a78998fe1f49510ef1f487c8cd5b369a37fb20d 100644 --- a/net/mptcp/pm_netlink.c +++ b/net/mptcp/pm_netlink.c @@ -1121,6 +1121,7 @@ static int mptcp_pm_nl_create_listen_socket(struct sock *sk, */ inet_sk_state_store(newsk, TCP_LISTEN); lock_sock(ssk); + WRITE_ONCE(mptcp_subflow_ctx(ssk)->pm_listener, true); err = __inet_listen_sk(ssk, backlog); if (!err) mptcp_event_pm_listener(ssk, MPTCP_EVENT_LISTENER_CREATED); diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h index 74417aae08d0f488bc358ce6cd931540650bb7be..568a72702b080d7610425ce5c3a409c7b88da13a 100644 --- a/net/mptcp/protocol.h +++ b/net/mptcp/protocol.h @@ -535,6 +535,7 @@ struct mptcp_subflow_context { __unused : 8; bool data_avail; bool scheduled; + bool pm_listener; /* a listener managed by the kernel PM? */ u32 remote_nonce; u64 thmac; u32 local_nonce; diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c index 25dde81bcb7575958635aaf14a5b8e9a5005e05f..6170f2fff71e4f9d64837f2ebf4d81bba224fafb 100644 --- a/net/mptcp/subflow.c +++ b/net/mptcp/subflow.c @@ -132,6 +132,13 @@ static void subflow_add_reset_reason(struct sk_buff *skb, u8 reason) } } +static int subflow_reset_req_endp(struct request_sock *req, struct sk_buff *skb) +{ + SUBFLOW_REQ_INC_STATS(req, MPTCP_MIB_MPCAPABLEENDPATTEMPT); + subflow_add_reset_reason(skb, MPTCP_RST_EPROHIBIT); + return -EPERM; +} + /* Init mptcp request socket. * * Returns an error code if a JOIN has failed and a TCP reset @@ -165,6 +172,8 @@ static int subflow_check_req(struct request_sock *req, if (opt_mp_capable) { SUBFLOW_REQ_INC_STATS(req, MPTCP_MIB_MPCAPABLEPASSIVE); + if (unlikely(listener->pm_listener)) + return subflow_reset_req_endp(req, skb); if (opt_mp_join) return 0; } else if (opt_mp_join) { @@ -172,6 +181,8 @@ static int subflow_check_req(struct request_sock *req, if (mp_opt.backup) SUBFLOW_REQ_INC_STATS(req, MPTCP_MIB_JOINSYNBACKUPRX); + } else if (unlikely(listener->pm_listener)) { + return subflow_reset_req_endp(req, skb); } if (opt_mp_capable && listener->request_mptcp) { From patchwork Mon Oct 14 14:06:01 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Matthieu Baerts \(NGI0\)" X-Patchwork-Id: 835659 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 608231B4F2E; Mon, 14 Oct 2024 14:06:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728914815; cv=none; b=Vv9vpbjvoKgu544MinZsXT7B0d27kA0t1ulHwfcfTaqTIL8sYbTwnKJr3ZRXJfiEVzJAryjECuDEZ53V84ci/55AJ97Kq/XvsaGBRS1LQz6clDfMpYscnqCE4sugY4uWBeNb3A3zOectY08puePVoicnAkjQGbOcr681vAwj/xQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728914815; c=relaxed/simple; bh=kjtFYgZ14FIDwbmtNTbCdsWne2fStMUuRE5AJPp6tsw=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=GhfxGL6XtRUVoby1ncm61UMPFSOQwu0cMjetb/xpSY53I9IYd46ULXntfVYTwBK7PeuQvb8UHMbFK1fue2TyCy2/yHPWSxvm6X6N0tEMuolUKn18GOunnaKrmW6g/QdAqq9x7uU9OhvVo+HQTU/gFyMZEopEGN9nAeSW5kIPe3Y= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gycPjT1v; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="gycPjT1v" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3B00BC4CEC3; Mon, 14 Oct 2024 14:06:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1728914815; bh=kjtFYgZ14FIDwbmtNTbCdsWne2fStMUuRE5AJPp6tsw=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=gycPjT1vQL6ApVMmyVqY38Q4oBxlRo9bj4oThG0/9/R1nBGOCvxNWc6D/HLGhD/mN 2dpfeCMJJUPHH5gnIIOqX79YF+a9wopX7Bmy8PCo9lF/jHW63rtlkt1NxGtIW8mQLC 0HYvDN9Yl5dbnPkEWrwn3XUb994SAsP052AKxqle2lo83wTC7t533ADkN7rbHvG/0D R3y5LaIWFmQ+0pz35w0H6Z6puYDV9WtnHvXMmq7xu6Kf3jpe9Fofrh2ahNhjGVwgBq aiYEcl3aBPuqT/+mCAdsS+p+ZkEV3y3LIWzwuRXWb4LQLenO6mN7My2BWcUSnO5FFo WMCaG0pVKNbjQ== From: "Matthieu Baerts (NGI0)" Date: Mon, 14 Oct 2024 16:06:01 +0200 Subject: [PATCH net v2 2/2] selftests: mptcp: join: test for prohibited MPC to port-based endp Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241014-net-mptcp-mpc-port-endp-v2-2-7faea8e6b6ae@kernel.org> References: <20241014-net-mptcp-mpc-port-endp-v2-0-7faea8e6b6ae@kernel.org> In-Reply-To: <20241014-net-mptcp-mpc-port-endp-v2-0-7faea8e6b6ae@kernel.org> To: mptcp@lists.linux.dev, Mat Martineau , Geliang Tang , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Shuah Khan Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Cong Wang , "Matthieu Baerts (NGI0)" , stable@vger.kernel.org X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=5370; i=matttbe@kernel.org; h=from:subject:message-id; bh=cGGs3/aSLVRmuw8IC+TS07d8nPl/LooYfHgyMwOfjWQ=; b=owEBbQKS/ZANAwAIAfa3gk9CaaBzAcsmYgBnDSV0gIkefGEx4C17dByQf64ZK2kflu701FzHU hzMqUvPVrqJAjMEAAEIAB0WIQToy4X3aHcFem4n93r2t4JPQmmgcwUCZw0ldAAKCRD2t4JPQmmg c0TfEAClevPSvAxkJ1KCHe+9lEbkKZcMzJ7S5RhP6a/CIX5ZnnLLCZjPKHmyg0PFg83Nw5ZtBGW aG0UdxcqdTV79IxGgvTrNcHjOIw7TaY6ZvA+4sRPMQ6YFjyRmhg2Yi4BprGbKC5vyVpY4hnDw5p T8X8FmAaIqxuX8GpRauNFVJ+i0VljNqQJ7Wo5mlNiLvMbFYPd1Em8VCo3HWHS56BHzNeLchCv4N dq4LF3wkmU2quPf4kYaOqmtaYaqyfqG7lwXvqDYtF+o1vsUjZDhUqaHQcGLAWPWMjcx4VCYJ3Y3 MAFhbYAC6D/jNdC0m0yYhoaol8a/Fg06qXCCUpmDRHduAhYlvU1vMFXW9I1sK1fpBMwS+01Y+rF B8fZHCkRYTGLKNNjukUXwa87hRAE7n8Lyz+iiVZflrYNfc4x6gH1JA56OP2zZ8ZM16su14/aP5n OuQgDK3F/osTv480dTYIDXO9ENdxd7kxsg6OqXVZceioz8AJRYV5A/sC9ORteDLTv0jk/BvKjwn mzMnCPbuqCq15X5wzC+KnS0DTg58/josz89/OVbg8Lpqg2CUiuTKibC2LjBbSmGHvymvsT/N3Fw fc7mIR4IzqiDQZ8vohRhaoaoDaaaSG1q2n38a8u+oQF10KbYHRkUJIPntkp6QXAaEC5cXN7dL6u k9DZ0QV4bvTqtlQ== X-Developer-Key: i=matttbe@kernel.org; a=openpgp; fpr=E8CB85F76877057A6E27F77AF6B7824F4269A073 From: Paolo Abeni Explicitly verify that MPC connection attempts towards a port-based signal endpoint fail with a reset. Note that this new test is a bit different from the other ones, not using 'run_tests'. It is then needed to add the capture capability, and the picking the right port which have been extracted into three new helpers. The info about the capture can also be printed from a single point, which simplifies the exit paths in do_transfer(). The 'Fixes' tag here below is the same as the one from the previous commit: this patch here is not fixing anything wrong in the selftests, but it validates the previous fix for an issue introduced by this commit ID. Fixes: 1729cf186d8a ("mptcp: create the listening socket for new port") Cc: stable@vger.kernel.org Co-developed-by: Matthieu Baerts (NGI0) Signed-off-by: Matthieu Baerts (NGI0) Signed-off-by: Paolo Abeni Reviewed-by: Mat Martineau Signed-off-by: Matthieu Baerts (NGI0) --- tools/testing/selftests/net/mptcp/mptcp_join.sh | 117 +++++++++++++++++------- 1 file changed, 86 insertions(+), 31 deletions(-) diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh index e8d0a01b4144264615d92b953a69ebd934ce468e..c07e2bd3a315aac9c422fed85c3196ec46e060f7 100755 --- a/tools/testing/selftests/net/mptcp/mptcp_join.sh +++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh @@ -23,6 +23,7 @@ tmpfile="" cout="" err="" capout="" +cappid="" ns1="" ns2="" iptables="iptables" @@ -887,6 +888,44 @@ check_cestab() fi } +cond_start_capture() +{ + local ns="$1" + + :> "$capout" + + if $capture; then + local capuser capfile + if [ -z $SUDO_USER ]; then + capuser="" + else + capuser="-Z $SUDO_USER" + fi + + capfile=$(printf "mp_join-%02u-%s.pcap" "$MPTCP_LIB_TEST_COUNTER" "$ns") + + echo "Capturing traffic for test $MPTCP_LIB_TEST_COUNTER into $capfile" + ip netns exec "$ns" tcpdump -i any -s 65535 -B 32768 $capuser -w "$capfile" > "$capout" 2>&1 & + cappid=$! + + sleep 1 + fi +} + +cond_stop_capture() +{ + if $capture; then + sleep 1 + kill $cappid + cat "$capout" + fi +} + +get_port() +{ + echo "$((10000 + MPTCP_LIB_TEST_COUNTER - 1))" +} + do_transfer() { local listener_ns="$1" @@ -894,33 +933,17 @@ do_transfer() local cl_proto="$3" local srv_proto="$4" local connect_addr="$5" + local port - local port=$((10000 + MPTCP_LIB_TEST_COUNTER - 1)) - local cappid local FAILING_LINKS=${FAILING_LINKS:-""} local fastclose=${fastclose:-""} local speed=${speed:-"fast"} + port=$(get_port) :> "$cout" :> "$sout" - :> "$capout" - if $capture; then - local capuser - if [ -z $SUDO_USER ] ; then - capuser="" - else - capuser="-Z $SUDO_USER" - fi - - capfile=$(printf "mp_join-%02u-%s.pcap" "$MPTCP_LIB_TEST_COUNTER" "${listener_ns}") - - echo "Capturing traffic for test $MPTCP_LIB_TEST_COUNTER into $capfile" - ip netns exec ${listener_ns} tcpdump -i any -s 65535 -B 32768 $capuser -w $capfile > "$capout" 2>&1 & - cappid=$! - - sleep 1 - fi + cond_start_capture ${listener_ns} NSTAT_HISTORY=/tmp/${listener_ns}.nstat ip netns exec ${listener_ns} \ nstat -n @@ -1007,10 +1030,7 @@ do_transfer() wait $spid local rets=$? - if $capture; then - sleep 1 - kill $cappid - fi + cond_stop_capture NSTAT_HISTORY=/tmp/${listener_ns}.nstat ip netns exec ${listener_ns} \ nstat | grep Tcp > /tmp/${listener_ns}.out @@ -1026,7 +1046,6 @@ do_transfer() ip netns exec ${connector_ns} ss -Menita 1>&2 -o "dport = :$port" cat /tmp/${connector_ns}.out - cat "$capout" return 1 fi @@ -1043,13 +1062,7 @@ do_transfer() fi rets=$? - if [ $retc -eq 0 ] && [ $rets -eq 0 ];then - cat "$capout" - return 0 - fi - - cat "$capout" - return 1 + [ $retc -eq 0 ] && [ $rets -eq 0 ] } make_file() @@ -2873,6 +2886,32 @@ verify_listener_events() fail_test } +chk_mpc_endp_attempt() +{ + local retl=$1 + local attempts=$2 + + print_check "Connect" + + if [ ${retl} = 124 ]; then + fail_test "timeout on connect" + elif [ ${retl} = 0 ]; then + fail_test "unexpected successful connect" + else + print_ok + + print_check "Attempts" + count=$(mptcp_lib_get_counter ${ns1} "MPTcpExtMPCapableEndpAttempt") + if [ -z "$count" ]; then + print_skip + elif [ "$count" != "$attempts" ]; then + fail_test "got ${count} MPC attempt[s] on port-based endpoint, expected ${attempts}" + else + print_ok + fi + fi +} + add_addr_ports_tests() { # signal address with port @@ -2963,6 +3002,22 @@ add_addr_ports_tests() chk_join_nr 2 2 2 chk_add_nr 2 2 2 fi + + if reset "port-based signal endpoint must not accept mpc"; then + local port retl count + port=$(get_port) + + cond_start_capture ${ns1} + pm_nl_add_endpoint ${ns1} 10.0.2.1 flags signal port ${port} + mptcp_lib_wait_local_port_listen ${ns1} ${port} + + timeout 1 ip netns exec ${ns2} \ + ./mptcp_connect -t ${timeout_poll} -p $port -s MPTCP 10.0.2.1 >/dev/null 2>&1 + retl=$? + cond_stop_capture + + chk_mpc_endp_attempt ${retl} 1 + fi } syncookies_tests()