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2024-05-13mptcp: move mptcp_pm_gen.h's includeMatthieu Baerts (NGI0)
Nothing from protocol.h depends on mptcp_pm_gen.h, only code from pm_netlink.c and pm_userspace.c depends on it. So this include can be moved where it is needed to avoid a "unused includes" warning. Reviewed-by: Geliang Tang <geliang@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: Mat Martineau <martineau@kernel.org> Link: https://lore.kernel.org/r/20240514011335.176158-8-martineau@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-05-13mptcp: add net.mptcp.available_schedulersGregory Detal
The sysctl lists the available schedulers that can be set using net.mptcp.scheduler similarly to net.ipv4.tcp_available_congestion_control. Signed-off-by: Gregory Detal <gregory.detal@gmail.com> Reviewed-by: Mat Martineau <martineau@kernel.org> Tested-by: Geliang Tang <geliang@kernel.org> Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: Mat Martineau <martineau@kernel.org> Link: https://lore.kernel.org/r/20240514011335.176158-5-martineau@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-05-13mptcp: fix full TCP keep-alive supportMatthieu Baerts (NGI0)
SO_KEEPALIVE support has been added a while ago, as part of a series "adding SOL_SOCKET" support. To have a full control of this keep-alive feature, it is important to also support TCP_KEEP* socket options at the SOL_TCP level. Supporting them on the setsockopt() part is easy, it is just a matter of remembering each value in the MPTCP sock structure, and calling tcp_sock_set_keep*() helpers on each subflow. If the value is not modified (0), calling these helpers will not do anything. For the getsockopt() part, the corresponding value from the MPTCP sock structure or the default one is simply returned. All of this is very similar to other TCP_* socket options supported by MPTCP. It looks important for kernels supporting SO_KEEPALIVE, to also support TCP_KEEP* options as well: some apps seem to (wrongly) consider that if the former is supported, the latter ones will be supported as well. But also, not having this simple and isolated change is preventing MPTCP support in some apps, and libraries like GoLang [1]. This is why this patch is seen as a fix. Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/383 Fixes: 1b3e7ede1365 ("mptcp: setsockopt: handle SO_KEEPALIVE and SO_PRIORITY") Link: https://github.com/golang/go/issues/56539 [1] Acked-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: Mat Martineau <martineau@kernel.org> Link: https://lore.kernel.org/r/20240514011335.176158-3-martineau@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-04-26mptcp: introducing a helper into active reset logicJason Xing
Since we have mapped every mptcp reset reason definition in enum sk_rst_reason, introducing a new helper can cover some missing places where we have already set the subflow->reset_reason. Note: using SK_RST_REASON_NOT_SPECIFIED is the same as SK_RST_REASON_MPTCP_RST_EUNSPEC. They are both unknown. So we can convert it directly. Suggested-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Jason Xing <kernelxing@tencent.com> Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2024-04-26mptcp: support rstreason for passive resetJason Xing
It relies on what reset options in the skb are as rfc8684 says. Reusing this logic can save us much energy. This patch replaces most of the prior NOT_SPECIFIED reasons. Signed-off-by: Jason Xing <kernelxing@tencent.com> Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2024-04-11mptcp: add last time fields in mptcp_infoGeliang Tang
This patch adds "last time" fields last_data_sent, last_data_recv and last_ack_recv in struct mptcp_sock to record the last time data_sent, data_recv and ack_recv happened. They all are initialized as tcp_jiffies32 in __mptcp_init_sock(), and updated as tcp_jiffies32 too when data is sent in __subflow_push_pending(), data is received in __mptcp_move_skbs_from_subflow(), and ack is received in ack_update_msk(). Similar to tcpi_last_data_sent, tcpi_last_data_recv and tcpi_last_ack_recv exposed with TCP, this patch exposes the last time "an action happened" for MPTCP in mptcp_info, named mptcpi_last_data_sent, mptcpi_last_data_recv and mptcpi_last_ack_recv, calculated in mptcp_diag_fill_info() as the time deltas between now and the newly added last time fields in mptcp_sock. Since msk->last_ack_recv needs to be protected by mptcp_data_lock/unlock, and lock_sock_fast can sleep and be quite slow, move the entire mptcp_data_lock/unlock block after the lock/unlock_sock_fast block. Then mptcpi_last_data_sent and mptcpi_last_data_recv are set in lock/unlock_sock_fast block, while mptcpi_last_ack_recv is set in mptcp_data_lock/unlock block, which is protected by a spinlock and should not block for too long. Also add three reserved bytes in struct mptcp_info not to have holes in this structure exposed to userspace. Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/446 Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn> Reviewed-by: Mat Martineau <martineau@kernel.org> Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Link: https://lore.kernel.org/r/20240410-upstream-net-next-20240405-mptcp-last-time-info-v2-1-f95bd6b33e51@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-04-01inet: preserve const qualifier in inet_csk()Eric Dumazet
We can change inet_csk() to propagate its argument const qualifier, thanks to container_of_const(). We have to fix few places that had mistakes, like tcp_bound_rto(). Signed-off-by: Eric Dumazet <edumazet@google.com> Link: https://lore.kernel.org/r/20240329144931.295800-1-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-03-11mptcp: annotate a data-race around sysctl_tcp_wmem[0]Jason Xing
It's possible that writer and the reader can manipulate the same sysctl knob concurrently. Using READ_ONCE() to prevent reading an old value. Signed-off-by: Jason Xing <kernelxing@tencent.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2024-03-06mptcp: update set_flags interfacesGeliang Tang
This patch updates set_flags interfaces, make it more similar to the interfaces of dump_addr and get_addr: mptcp_pm_set_flags(struct sk_buff *skb, struct genl_info *info) mptcp_pm_nl_set_flags(struct sk_buff *skb, struct genl_info *info) mptcp_userspace_pm_set_flags(struct sk_buff *skb, struct genl_info *info) Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn> Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Link: https://lore.kernel.org/r/20240305-upstream-net-next-20240304-mptcp-misc-cleanup-v1-2-c436ba5e569b@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-03-04mptcp: get addr in userspace pm listGeliang Tang
This patch renames mptcp_pm_nl_get_addr_doit() as a dedicated in-kernel netlink PM get addr function mptcp_pm_nl_get_addr(). and invoke a new wrapper mptcp_pm_get_addr() in mptcp_pm_nl_get_addr_doit. If a token is gotten in the wrapper, that means a userspace PM is used. So invoke mptcp_userspace_pm_get_addr() to get addr in userspace PM list. Otherwise, invoke mptcp_pm_nl_get_addr(). Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn> Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2024-03-04mptcp: implement mptcp_userspace_pm_get_addrGeliang Tang
This patch implements mptcp_userspace_pm_get_addr() to get an address from userspace pm address list according the given 'token' and 'id'. Use nla_get_u32() to get the u32 value of 'token', then pass it to mptcp_token_get_sock() to get the msk. Pass 'msk' and 'id' to the helper mptcp_userspace_pm_lookup_addr_by_id() to get the address entry. Put this entry to userspace using mptcp_pm_nl_put_entry_info(). Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn> Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2024-03-04mptcp: dump addrs in userspace pm listGeliang Tang
This patch renames mptcp_pm_nl_get_addr_dumpit() as a dedicated in-kernel netlink PM dump addrs function mptcp_pm_nl_dump_addr(), and invoke a newly added wrapper mptcp_pm_dump_addr() in mptcp_pm_nl_get_addr_dumpit(). Invoke in-kernel PM dump addrs function mptcp_pm_nl_dump_addr() or userspace PM dump addrs function mptcp_userspace_pm_dump_addr() based on whether the token parameter is passed in or not in the wrapper. Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn> Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2024-03-04mptcp: implement mptcp_userspace_pm_dump_addrGeliang Tang
This patch implements mptcp_userspace_pm_dump_addr() to dump addresses from userspace pm address list. Use mptcp_token_get_sock() to get the msk from the given token, if userspace PM is enabled in it, traverse each address entry in address list, put every entry to userspace using mptcp_pm_nl_put_entry_msg(). Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn> Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2024-03-04mptcp: export mptcp_genl_family & mptcp_nl_fill_addrGeliang Tang
This patch exports struct mptcp_genl_family and mptcp_nl_fill_addr() helper to allow them can be used in pm_userspace.c. Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn> Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2024-03-04mptcp: make pm_remove_addrs_and_subflows staticGeliang Tang
mptcp_pm_remove_addrs_and_subflows() is only used in pm_netlink.c, it's no longer used in pm_userspace.c any more since the commit 8b1c94da1e48 ("mptcp: only send RM_ADDR in nl_cmd_remove"). So this patch changes it to a static function. Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn> Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2024-03-04mptcp: implement TCP_NOTSENT_LOWAT supportPaolo Abeni
Add support for such socket option storing the user-space provided value in a new msk field, and using such data to implement the _mptcp_stream_memory_free() helper, similar to the TCP one. To avoid adding more indirect calls in the fast path, open-code a variant of sk_stream_memory_free() in mptcp_sendmsg() and add direct calls to the mptcp stream memory free helper where possible. Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/464 Signed-off-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2024-03-04mptcp: cleanup writer wake-upPaolo Abeni
After commit 5cf92bbadc58 ("mptcp: re-enable sndbuf autotune"), the MPTCP_NOSPACE bit is redundant: it is always set and cleared together with SOCK_NOSPACE. Let's drop the first and always relay on the latter, dropping a bunch of useless code. Signed-off-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2024-02-29Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski
Cross-merge networking fixes after downstream PR. Conflicts: net/mptcp/protocol.c adf1bb78dab5 ("mptcp: fix snd_wnd initialization for passive socket") 9426ce476a70 ("mptcp: annotate lockless access for RX path fields") https://lore.kernel.org/all/20240228103048.19255709@canb.auug.org.au/ Adjacent changes: drivers/dpll/dpll_core.c 0d60d8df6f49 ("dpll: rely on rcu for netdev_dpll_pin()") e7f8df0e81bf ("dpll: move xa_erase() call in to match dpll_pin_alloc() error path order") drivers/net/veth.c 1ce7d306ea63 ("veth: try harder when allocating queue memory") 0bef512012b1 ("net: add netdev_lockdep_set_classes() to virtual drivers") drivers/net/wireless/intel/iwlwifi/mvm/d3.c 8c9bef26e98b ("wifi: iwlwifi: mvm: d3: implement suspend with MLO") 78f65fbf421a ("wifi: iwlwifi: mvm: ensure offloading TID queue exists") net/wireless/nl80211.c f78c1375339a ("wifi: nl80211: reject iftype change with mesh ID change") 414532d8aa89 ("wifi: cfg80211: use IEEE80211_MAX_MESH_ID_LEN appropriately") Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-02-26mptcp: check the protocol in mptcp_sk() with DEBUG_NETMatthieu Baerts (NGI0)
Fuzzers and static checkers might not detect when mptcp_sk() is used with a non mptcp_sock structure. This is similar to the parent commit, where it is easy to use mptcp_sk() with a TCP sock, e.g. with a subflow sk. So a new simple check is done when CONFIG_DEBUG_NET is enabled to tell kernel devs when a non-MPTCP socket is being used as an MPTCP one. 'mptcp_sk()' macro is then defined differently: with an extra WARN to complain when an unexpected socket is being used. Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Link: https://lore.kernel.org/r/20240223-upstream-net-next-20240223-misc-improvements-v1-4-b6c8a10396bd@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-02-26mptcp: check the protocol in tcp_sk() with DEBUG_NETMatthieu Baerts (NGI0)
Fuzzers and static checkers might not detect when tcp_sk() is used with a non tcp_sock structure. This kind of mistake already happened a few times with MPTCP: when wrongly using TCP-specific helpers with mptcp_sock pointers. On the other hand, there are many 'tcp_xxx()' helpers that are taking a 'struct sock' pointer as arguments, and some of them are only looking at fields from 'struct sock', and nothing from 'struct tcp_sock'. It is then tempting to use them with a 'struct mptcp_sock'. So a new simple check is done when CONFIG_DEBUG_NET is enabled to tell kernel devs when a non-TCP socket is being used as a TCP one. 'tcp_sk()' macro is then re-defined to add a WARN when an unexpected socket is being used. Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Link: https://lore.kernel.org/r/20240223-upstream-net-next-20240223-misc-improvements-v1-3-b6c8a10396bd@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-02-26mptcp: fix potential wake-up event lossPaolo Abeni
After the blamed commit below, the send buffer auto-tuning can happen after that the mptcp_propagate_sndbuf() completes - via the delegated action infrastructure. We must check for write space even after such change or we risk missing the wake-up event. Fixes: 8005184fd1ca ("mptcp: refactor sndbuf auto-tuning") Cc: stable@vger.kernel.org Signed-off-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Link: https://lore.kernel.org/r/20240223-upstream-net-20240223-misc-fixes-v1-6-162e87e48497@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-02-22Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski
Cross-merge networking fixes after downstream PR. Conflicts: net/ipv4/udp.c f796feabb9f5 ("udp: add local "peek offset enabled" flag") 56667da7399e ("net: implement lockless setsockopt(SO_PEEK_OFF)") Adjacent changes: net/unix/garbage.c aa82ac51d633 ("af_unix: Drop oob_skb ref before purging queue in GC.") 11498715f266 ("af_unix: Remove io_uring code for GC.") Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-02-18mptcp: fix data races on local_idPaolo Abeni
The local address id is accessed lockless by the NL PM, add all the required ONCE annotation. There is a caveat: the local id can be initialized late in the subflow life-cycle, and its validity is controlled by the local_id_valid flag. Remove such flag and encode the validity in the local_id field itself with negative value before initialization. That allows accessing the field consistently with a single read operation. Fixes: 0ee4261a3681 ("mptcp: implement mptcp_pm_remove_subflow") Cc: stable@vger.kernel.org Signed-off-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2024-02-15Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski
Cross-merge networking fixes after downstream PR. No conflicts. Adjacent changes: net/core/dev.c 9f30831390ed ("net: add rcu safety to rtnl_prop_list_size()") 723de3ebef03 ("net: free altname using an RCU callback") net/unix/garbage.c 11498715f266 ("af_unix: Remove io_uring code for GC.") 25236c91b5ab ("af_unix: Fix task hung while purging oob_skb in GC.") drivers/net/ethernet/renesas/ravb_main.c ed4adc07207d ("net: ravb: Count packets instead of descriptors in GbEth RX path" ) c2da9408579d ("ravb: Add Rx checksum offload support for GbEth") net/mptcp/protocol.c bdd70eb68913 ("mptcp: drop the push_pending field") 28e5c1380506 ("mptcp: annotate lockless accesses around read-mostly fields") Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-02-12mptcp: really cope with fastopen racePaolo Abeni
Fastopen and PM-trigger subflow shutdown can race, as reported by syzkaller. In my first attempt to close such race, I missed the fact that the subflow status can change again before the subflow_state_change callback is invoked. Address the issue additionally copying with all the states directly reachable from TCP_FIN_WAIT1. Fixes: 1e777f39b4d7 ("mptcp: add MSG_FASTOPEN sendmsg flag support") Fixes: 4fd19a307016 ("mptcp: fix inconsistent state on fastopen race") Cc: stable@vger.kernel.org Reported-by: syzbot+c53d4d3ddb327e80bc51@syzkaller.appspotmail.com Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/458 Signed-off-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2024-02-12mptcp: corner case locking for rx path fields initializationPaolo Abeni
Most MPTCP-level related fields are under the mptcp data lock protection, but are written one-off without such lock at MPC complete time, both for the client and the server Leverage the mptcp_propagate_state() infrastructure to move such initialization under the proper lock client-wise. The server side critical init steps are done by mptcp_subflow_fully_established(): ensure the caller properly held the relevant lock, and avoid acquiring the same lock in the nested scopes. There are no real potential races, as write access to such fields is implicitly serialized by the MPTCP state machine; the primary goal is consistency. Fixes: d22f4988ffec ("mptcp: process MP_CAPABLE data option") Cc: stable@vger.kernel.org Signed-off-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2024-02-12mptcp: fix rcv space initializationPaolo Abeni
mptcp_rcv_space_init() is supposed to happen under the msk socket lock, but active msk socket does that without such protection. Leverage the existing mptcp_propagate_state() helper to that extent. We need to ensure mptcp_rcv_space_init will happen before mptcp_rcv_space_adjust(), and the release_cb does not assure that: explicitly check for such condition. While at it, move the wnd_end initialization out of mptcp_rcv_space_init(), it never belonged there. Note that the race does not produce ill effect in practice, but change allows cleaning-up and defying better the locking model. Fixes: a6b118febbab ("mptcp: add receive buffer auto-tuning") Cc: stable@vger.kernel.org Signed-off-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2024-02-12mptcp: drop the push_pending fieldPaolo Abeni
Such field is there to avoid acquiring the data lock in a few spots, but it adds complexity to the already non trivial locking schema. All the relevant call sites (mptcp-level re-injection, set socket options), are slow-path, drop such field in favor of 'cb_flags', adding the relevant locking. This patch could be seen as an improvement, instead of a fix. But it simplifies the next patch. The 'Fixes' tag has been added to help having this series backported to stable. Fixes: e9d09baca676 ("mptcp: avoid atomic bit manipulation when possible") Cc: stable@vger.kernel.org Signed-off-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2024-02-05mptcp: annotate lockless access for the tx pathPaolo Abeni
The mptcp-level TX path info (write_seq, bytes_sent, snd_nxt) are under the msk socket lock protection, and are accessed lockless in a few spots. Always mark the write operations with WRITE_ONCE, read operations outside the lock with READ_ONCE and drop the annotation for read under such lock. To simplify the annotations move mptcp_pending_data_fin_ack() from __mptcp_data_acked() to __mptcp_clean_una(), under the msk socket lock, where such call would belong. Signed-off-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2024-02-05mptcp: annotate access for msk keysPaolo Abeni
Both the local and the remote key follow the same locking schema, put in place the proper ONCE accessors. Signed-off-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2024-01-02mptcp: add CurrEstab MIB counter supportGeliang Tang
Add a new MIB counter named MPTCP_MIB_CURRESTAB to count current established MPTCP connections, similar to TCP_MIB_CURRESTAB. This is useful to quickly list the number of MPTCP connections without having to iterate over all of them. This patch adds a new helper function mptcp_set_state(): if the state switches from or to ESTABLISHED state, this newly added counter is incremented. This helper is going to be used in the following patch. Similar to MPTCP_INC_STATS(), a new helper called MPTCP_DEC_STATS() is also needed to decrement a MIB counter. Signed-off-by: Geliang Tang <geliang.tang@linux.dev> Acked-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Matthieu Baerts <matttbe@kernel.org> Signed-off-by: Matthieu Baerts <matttbe@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2023-12-21Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netPaolo Abeni
Cross-merge networking fixes after downstream PR. Adjacent changes: drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c 23c93c3b6275 ("bnxt_en: do not map packet buffers twice") 6d1add95536b ("bnxt_en: Modify TX ring indexing logic.") tools/testing/selftests/net/Makefile 2258b666482d ("selftests: add vlan hw filter tests") a0bc96c0cd6e ("selftests: net: verify fq per-band packet limit") Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2023-12-17mptcp: fix inconsistent state on fastopen racePaolo Abeni
The netlink PM can race with fastopen self-connect attempts, shutting down the first subflow via: MPTCP_PM_CMD_DEL_ADDR -> mptcp_nl_remove_id_zero_address -> mptcp_pm_nl_rm_subflow_received -> mptcp_close_ssk and transitioning such subflow to FIN_WAIT1 status before the syn-ack packet is processed. The MPTCP code does not react to such state change, leaving the connection in not-fallback status and the subflow handshake uncompleted, triggering the following splat: WARNING: CPU: 0 PID: 10630 at net/mptcp/subflow.c:1405 subflow_data_ready+0x39f/0x690 net/mptcp/subflow.c:1405 Modules linked in: CPU: 0 PID: 10630 Comm: kworker/u4:11 Not tainted 6.6.0-syzkaller-14500-g1c41041124bd #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Workqueue: bat_events batadv_nc_worker RIP: 0010:subflow_data_ready+0x39f/0x690 net/mptcp/subflow.c:1405 Code: 18 89 ee e8 e3 d2 21 f7 40 84 ed 75 1f e8 a9 d7 21 f7 44 89 fe bf 07 00 00 00 e8 0c d3 21 f7 41 83 ff 07 74 07 e8 91 d7 21 f7 <0f> 0b e8 8a d7 21 f7 48 89 df e8 d2 b2 ff ff 31 ff 89 c5 89 c6 e8 RSP: 0018:ffffc90000007448 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888031efc700 RCX: ffffffff8a65baf4 RDX: ffff888043222140 RSI: ffffffff8a65baff RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000007 R10: 000000000000000b R11: 0000000000000000 R12: 1ffff92000000e89 R13: ffff88807a534d80 R14: ffff888021c11a00 R15: 000000000000000b FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa19a0ffc81 CR3: 000000007a2db000 CR4: 00000000003506f0 DR0: 000000000000d8dd DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: <IRQ> tcp_data_ready+0x14c/0x5b0 net/ipv4/tcp_input.c:5128 tcp_data_queue+0x19c3/0x5190 net/ipv4/tcp_input.c:5208 tcp_rcv_state_process+0x11ef/0x4e10 net/ipv4/tcp_input.c:6844 tcp_v4_do_rcv+0x369/0xa10 net/ipv4/tcp_ipv4.c:1929 tcp_v4_rcv+0x3888/0x3b30 net/ipv4/tcp_ipv4.c:2329 ip_protocol_deliver_rcu+0x9f/0x480 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2e4/0x510 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] ip_local_deliver+0x1b6/0x550 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:461 [inline] ip_rcv_finish+0x1c4/0x2e0 net/ipv4/ip_input.c:449 NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] ip_rcv+0xce/0x440 net/ipv4/ip_input.c:569 __netif_receive_skb_one_core+0x115/0x180 net/core/dev.c:5527 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5641 process_backlog+0x101/0x6b0 net/core/dev.c:5969 __napi_poll.constprop.0+0xb4/0x540 net/core/dev.c:6531 napi_poll net/core/dev.c:6600 [inline] net_rx_action+0x956/0xe90 net/core/dev.c:6733 __do_softirq+0x21a/0x968 kernel/softirq.c:553 do_softirq kernel/softirq.c:454 [inline] do_softirq+0xaa/0xe0 kernel/softirq.c:441 </IRQ> <TASK> __local_bh_enable_ip+0xf8/0x120 kernel/softirq.c:381 spin_unlock_bh include/linux/spinlock.h:396 [inline] batadv_nc_purge_paths+0x1ce/0x3c0 net/batman-adv/network-coding.c:471 batadv_nc_worker+0x9b1/0x10e0 net/batman-adv/network-coding.c:722 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784 kthread+0x33c/0x440 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 </TASK> To address the issue, catch the racing subflow state change and use it to cause the MPTCP fallback. Such fallback is also used to cause the first subflow state propagation to the msk socket via mptcp_set_connected(). After this change, the first subflow can additionally propagate the TCP_FIN_WAIT1 state, so rename the helper accordingly. Finally, if the state propagation is delayed to the msk release callback, the first subflow can change to a different state in between. Cache the relevant target state in a new msk-level field and use such value to update the msk state at release time. Fixes: 1e777f39b4d7 ("mptcp: add MSG_FASTOPEN sendmsg flag support") Cc: stable@vger.kernel.org Reported-by: <syzbot+c53d4d3ddb327e80bc51@syzkaller.appspotmail.com> Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/458 Signed-off-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts <matttbe@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2023-11-29mptcp: add mptcpi_subflows_total counterGeliang Tang
If the initial subflow has been removed, we cannot know without checking other counters, e.g. ss -ti <filter> | grep -c tcp-ulp-mptcp or getsockopt(SOL_MPTCP, MPTCP_FULL_INFO, ...) (or others except MPTCP_INFO of course) and then check mptcp_subflow_data->num_subflows to get the total amount of subflows. This patch adds a new counter mptcpi_subflows_total in mptcpi_flags to store the total amount of subflows, including the initial one. A new helper __mptcp_has_initial_subflow() is added to check whether the initial subflow has been removed or not. With this helper, we can then compute the total amount of subflows from mptcp_info by doing something like: mptcpi_subflows_total = mptcpi_subflows + __mptcp_has_initial_subflow(msk). Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/428 Reviewed-by: Matthieu Baerts <matttbe@kernel.org> Signed-off-by: Geliang Tang <geliang.tang@suse.com> Signed-off-by: Mat Martineau <martineau@kernel.org> Link: https://lore.kernel.org/r/20231128-send-net-next-2023107-v4-1-8d6b94150f6b@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-10-27mptcp: use mptcp_check_fallback helperGeliang Tang
Use __mptcp_check_fallback() helper defined in net/mptcp/protocol.h, instead of open-coding it in both __mptcp_do_fallback() and mptcp_diag_fill_info(). Reviewed-by: Matthieu Baerts <matttbe@kernel.org> Signed-off-by: Geliang Tang <geliang.tang@suse.com> Signed-off-by: Mat Martineau <martineau@kernel.org> Link: https://lore.kernel.org/r/20231025-send-net-next-20231025-v1-5-db8f25f798eb@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-10-27mptcp: drop useless ssk in pm_subflow_check_nextGeliang Tang
The code using 'ssk' parameter of mptcp_pm_subflow_check_next() has been dropped in commit "95d686517884 (mptcp: fix subflow accounting on close)". So drop this useless parameter ssk. Reviewed-by: Matthieu Baerts <matttbe@kernel.org> Signed-off-by: Geliang Tang <geliang.tang@suse.com> Signed-off-by: Mat Martineau <martineau@kernel.org> Link: https://lore.kernel.org/r/20231025-send-net-next-20231025-v1-4-db8f25f798eb@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-10-25mptcp: refactor sndbuf auto-tuningPaolo Abeni
The MPTCP protocol account for the data enqueued on all the subflows to the main socket send buffer, while the send buffer auto-tuning algorithm set the main socket send buffer size as the max size among the subflows. That causes bad performances when at least one subflow is sndbuf limited, e.g. due to very high latency, as the MPTCP scheduler can't even fill such buffer. Change the send-buffer auto-tuning algorithm to compute the main socket send buffer size as the sum of all the subflows buffer size. Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Mat Martineau <martineau@kernel.org> Link: https://lore.kernel.org/r/20231023-send-net-next-20231023-2-v1-9-9dc60939d371@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-10-25mptcp: give rcvlowat some lovePaolo Abeni
The MPTCP protocol allow setting sk_rcvlowat, but the value there is currently ignored. Additionally, the default subflows sk_rcvlowat basically disables per subflow delayed ack: the MPTCP protocol move the incoming data from the subflows into the msk socket as soon as the TCP stacks invokes the subflow data_ready callback. Later, when __tcp_ack_snd_check() takes action, the subflow-level copied_seq matches rcv_nxt, and that mandate for an immediate ack. Let the mptcp receive path be aware of such threshold, explicitly tracking the amount of data available to be ready and checking vs sk_rcvlowat in mptcp_poll() and before waking-up readers. Additionally implement the set_rcvlowat() callback, to properly handle the rcvbuf auto-tuning on sk_rcvlowat changes. Finally to properly handle delayed ack, force the subflow level threshold to 0 and instead explicitly ask for an immediate ack when the msk level th is not reached. Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Mat Martineau <martineau@kernel.org> Link: https://lore.kernel.org/r/20231023-send-net-next-20231023-2-v1-5-9dc60939d371@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-10-25mptcp: use plain bool instead of custom binary enumPaolo Abeni
The 'data_avail' subflow field is already used as plain boolean, drop the custom binary enum type and switch to bool. No functional changed intended. Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Mat Martineau <martineau@kernel.org> Link: https://lore.kernel.org/r/20231023-send-net-next-20231023-2-v1-3-9dc60939d371@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-10-25mptcp: add a new sysctl for make after break timeoutPaolo Abeni
The MPTCP protocol allows sockets with no alive subflows to stay in ESTABLISHED status for and user-defined timeout, to allow for later subflows creation. Currently such timeout is constant - TCP_TIMEWAIT_LEN. Let the user-space configure them via a newly added sysctl, to better cope with busy servers and simplify (make them faster) the relevant pktdrill tests. Note that the new know does not apply to orphaned MPTCP socket waiting for the data_fin handshake completion: they always wait TCP_TIMEWAIT_LEN. Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Mat Martineau <martineau@kernel.org> Link: https://lore.kernel.org/r/20231023-send-net-next-20231023-2-v1-1-9dc60939d371@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-10-24net: mptcp: use policy generated by YAML specDavide Caratti
generated with: $ ./tools/net/ynl/ynl-gen-c.py --mode kernel \ > --spec Documentation/netlink/specs/mptcp.yaml --source \ > -o net/mptcp/mptcp_pm_gen.c $ ./tools/net/ynl/ynl-gen-c.py --mode kernel \ > --spec Documentation/netlink/specs/mptcp.yaml --header \ > -o net/mptcp/mptcp_pm_gen.h Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/340 Acked-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Davide Caratti <dcaratti@redhat.com> Signed-off-by: Mat Martineau <martineau@kernel.org> Link: https://lore.kernel.org/r/20231023-send-net-next-20231023-1-v2-7-16b1f701f900@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-10-24net: mptcp: rename netlink handlers to mptcp_pm_nl_<blah>_{doit,dumpit}Davide Caratti
so that they will match names generated from YAML spec. Link: https://github.com/multipath-tcp/mptcp_net-next/issues/340 Suggested-by: Paolo Abeni <pabeni@redhat.com> Acked-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Davide Caratti <dcaratti@redhat.com> Signed-off-by: Mat Martineau <martineau@kernel.org> Link: https://lore.kernel.org/r/20231023-send-net-next-20231023-1-v2-6-16b1f701f900@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-10-05mptcp: fix delegated action racesPaolo Abeni
The delegated action infrastructure is prone to the following race: different CPUs can try to schedule different delegated actions on the same subflow at the same time. Each of them will check different bits via mptcp_subflow_delegate(), and will try to schedule the action on the related per-cpu napi instance. Depending on the timing, both can observe an empty delegated list node, causing the same entry to be added simultaneously on two different lists. The root cause is that the delegated actions infra does not provide a single synchronization point. Address the issue reserving an additional bit to mark the subflow as scheduled for delegation. Acquiring such bit guarantee the caller to own the delegated list node, and being able to safely schedule the subflow. Clear such bit only when the subflow scheduling is completed, ensuring proper barrier in place. Additionally swap the meaning of the delegated_action bitmask, to allow the usage of the existing helper to set multiple bit at once. Fixes: bcd97734318d ("mptcp: use delegate action to schedule 3rd ack retrans") Cc: stable@vger.kernel.org Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Mat Martineau <martineau@kernel.org> Link: https://lore.kernel.org/r/20231004-send-net-20231004-v1-1-28de4ac663ae@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-09-18mptcp: fix dangling connection hang-upPaolo Abeni
According to RFC 8684 section 3.3: A connection is not closed unless [...] or an implementation-specific connection-level send timeout. Currently the MPTCP protocol does not implement such timeout, and connection timing-out at the TCP-level never move to close state. Introduces a catch-up condition at subflow close time to move the MPTCP socket to close, too. That additionally allows removing similar existing inside the worker. Finally, allow some additional timeout for plain ESTABLISHED mptcp sockets, as the protocol allows creating new subflows even at that point and making the connection functional again. This issue is actually present since the beginning, but it is basically impossible to solve without a long chain of functional pre-requisites topped by commit bbd49d114d57 ("mptcp: consolidate transition to TCP_CLOSE in mptcp_do_fastclose()"). When backporting this current patch, please also backport this other commit as well. Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/430 Fixes: e16163b6e2b7 ("mptcp: refactor shutdown and close") Cc: stable@vger.kernel.org Signed-off-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2023-09-18mptcp: rename timer related helper to less confusing namesPaolo Abeni
The msk socket uses to different timeout to track close related events and retransmissions. The existing helpers do not indicate clearly which timer they actually touch, making the related code quite confusing. Change the existing helpers name to avoid such confusion. No functional change intended. This patch is linked to the next one ("mptcp: fix dangling connection hang-up"). The two patches are supposed to be backported together. Cc: stable@vger.kernel.org # v5.11+ Signed-off-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2023-08-22mptcp: register default schedulerGeliang Tang
This patch defines the default packet scheduler mptcp_sched_default. Register it in mptcp_sched_init(), which is invoked in mptcp_proto_init(). Skip deleting this default scheduler in mptcp_unregister_scheduler(). Set msk->sched to the default scheduler when the input parameter of mptcp_init_sched() is NULL. Invoke mptcp_sched_default_get_subflow in get_send() and get_retrans() if the defaut scheduler is set or msk->sched is NULL. Acked-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Geliang Tang <geliang.tang@suse.com> Signed-off-by: Mat Martineau <martineau@kernel.org> Link: https://lore.kernel.org/r/20230821-upstream-net-next-20230818-v1-10-0c860fb256a8@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-08-22mptcp: add scheduler wrappersGeliang Tang
This patch defines two packet scheduler wrappers mptcp_sched_get_send() and mptcp_sched_get_retrans(), invoke get_subflow() of msk->sched in them. Set data->reinject to true in mptcp_sched_get_retrans(), set it false in mptcp_sched_get_send(). If msk->sched is NULL, use default functions mptcp_subflow_get_send() and mptcp_subflow_get_retrans() to send data. Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Geliang Tang <geliang.tang@suse.com> Signed-off-by: Mat Martineau <martineau@kernel.org> Link: https://lore.kernel.org/r/20230821-upstream-net-next-20230818-v1-7-0c860fb256a8@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-08-22mptcp: add scheduled in mptcp_subflow_contextGeliang Tang
This patch adds a new member scheduled in struct mptcp_subflow_context, which will be set in the MPTCP scheduler context when the scheduler picks this subflow to send data. Add a new helper mptcp_subflow_set_scheduled() to set this flag using WRITE_ONCE(). Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Geliang Tang <geliang.tang@suse.com> Signed-off-by: Mat Martineau <martineau@kernel.org> Link: https://lore.kernel.org/r/20230821-upstream-net-next-20230818-v1-6-0c860fb256a8@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-08-22mptcp: add sched in mptcp_sockGeliang Tang
This patch adds a new struct member sched in struct mptcp_sock. And two helpers mptcp_init_sched() and mptcp_release_sched() to init and release it. Init it with the sysctl scheduler in mptcp_init_sock(), copy the scheduler from the parent in mptcp_sk_clone(), and release it in __mptcp_destroy_sock(). Acked-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Geliang Tang <geliang.tang@suse.com> Signed-off-by: Mat Martineau <martineau@kernel.org> Link: https://lore.kernel.org/r/20230821-upstream-net-next-20230818-v1-5-0c860fb256a8@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-08-22mptcp: add a new sysctl schedulerGeliang Tang
This patch adds a new sysctl, named scheduler, to support for selection of different schedulers. Export mptcp_get_scheduler helper to get this sysctl. Acked-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Geliang Tang <geliang.tang@suse.com> Signed-off-by: Mat Martineau <martineau@kernel.org> Link: https://lore.kernel.org/r/20230821-upstream-net-next-20230818-v1-4-0c860fb256a8@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-17 19:40:00 +0000