kernel/linux.git/include/linux/net.h, branch v7.3-rc1

Merge tag 'net-next-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next

2026-08-20T15:16:04+00:00

Pull networking updates from Jakub Kicinski: "One of the 'small improvements all over the place' releases for us. It's hard to draw any direct comparisons because summer vacations disrupted our patch processing (and presumably - generation) quite a bit. Quick and dirty count suggests we (Paolo and I) merged a very similar number of net (632) and net-next (648) patches. This is not telling the full story either because 1/3 to 1/2 of the net-next patches also *seem* like AI-driven low priority fixes, cleanups and clarifications. We are completely overwhelmed, of course. The glimmer of hope is that we secured sufficient LLM budget and access (thank you Meta!) to run reviews with multiple frontier models on each patch. This eliminates some hallucinations. That said, in terms of review, the LLMs can only do so much. The sad truth is that our APIs (especially for rare events like PCIe errors, timeouts etc) have always been racy, and now LLMs don't let us ignore that. I expect our direction for the next release will be to tweak the reviews a little bit more, but start shifting focus to letting the LLMs take care of the busy work - managing patchwork, automating common process complaints, editing commit messages, and maybe applying patches which already got "reviewed-by" tags from people we trust... Core & protocols: - A few steps lowering rtnl_lock dependence: - per-netns netdev unregistration for select SW drivers (e.g. veth, ipvlan, tunnels) - rtnl_lock-less FIB rule changes (RTM_NEWRULE and RTM_DELRULE) - prepare software drivers and TC qdiscs for rtnl_lock-less GET - Support BIG TCP (>64kB TSO) in UDP tunnels (vxlan, geneve) - Support buffers larger than PAGE_SIZE in devmem zero-copy API - Improve MPTCP handling of extreme memory pressure handling, when out-of-order queue had to be pruned - Report the per-group user count via RTM_GETMULTICAST - Expose the route deletion reason in RTM_DELROUTE - Add a SO_RIGHTS_NOTRUNC option to UNIX sockets to enable more useful handling of LSM denials when receiving SCM_RIGHTS messages: instead of truncating the message at the first blocked fd, keep every fd slot and store the LSM errno in the blocked slot - IPv6 Segment Routing - support looking up the post-encap SID (address) in a different/specified routing table - Support PRP RedBox (interlink) creation - Support per-nexthop UDP dst port in VXLAN - Continue converting getsockopt callbacks in a number of protocols to iov_iter Ethernet: - Merge initial CXL support for AMD/Solarflare NICs (shared branch with the CXL tree) - New drivers: - ADIN1140 10BASE-T1S MACPHY - Initial skeleton of Intel iXD and ZTE Dinghai drivers - High-speed NICs: - AMD/Pensando: - support firmware flashing - Cisco (enic): - SR-IOV V2 admin channel and MBOX protocol - Huawei (hns3): - support for ethtool pfc_prevention_tout - nVidia/Mellanox: - support sharing bandwidth control across interfaces of the same device - Marvell (octeontx2-pf): - link RQ page pools to netdev for Netlink stats - Google vNIC: - XDP metadata support for DQ RDA - Microsoft vNIC: - support forcing full-page RX buffers - Other NICs: - Synopsys IP: - eic7700: support for eth1 - Microchip (lan743x): - support for RMII interface - Wangxun: - support for ethtool -G and -C for VFs - add Tx timeout and PCIe error handling - Intel (igb/igc): - RSS key get/set support - support for forcing link speed without auto-negotiation - Switches: - NXP (dpaa2): - support bonding/LAG offload - Mediatek: - mt7530: EN7528 support - initial support for MT7628 - Micrel (ksz8/9): - refactoring work to move towards library model - PTP support for KSZ8463 - nVidia/Mellanox: - support rtnl-lock-less ethtool callbacks - Realtek: - rtl8366rb: use generic RTL83xx code - support SGMII and HSGMII for RTL8367S - PHYs: - Airoha: - EcoNet EN7528 PHY support - DAPU Telecom - DAPU Telecom DAP8211R(I) Gigabit PHY support - Realtek: - support RTL8261C_CG - support RTL8261D Wireless: - nl80211: per-link statistics support for multi-link operation - mac80211: AQL/airtime-fairness support for multicast - Merge Peripheral Authentication Service (PAS) / TEE support for ath12k (shared branch with the firmware/qcom tree) - New drivers: - mm81x for Morse Micro Long-Range S1G devices - nxpwifi for NXP devices (mostly forked off from mwifiex) - Driver changes: - Broadcom (brcmfmac): - DPP support, some Cypress part update - MediaTek (mt76): - mt7928 support - mt7925 NAN support - mt7996 AP powersave improvements - Qualcomm (ath12k): - much kernel infrastructure integration work - AHB platform MultiPD support - Realtek (rt89): - LED support - RTL8922DE support - dual-BT coex for RTL8922D - Intel: - new FW version support Bluetooth: - HCI: add support for Shorter Connection Interval (SCI) feature - af_bluetooth: add minimal context analysis annotations - Driver changes: - Intel: - add Bluetooth SAR revision 2 support - add vendor_reset PCI sysfs for PLDR - Mediatek: - add USB IDs for MT7902 and MT7922 devices - Realtek: - add USB IDs for 8761CU and 8852BE devices - NXP: - add M.2 Bluetooth device support using pwrseq Misc: - DPLL support for manual/numerical oscillator control (NCO) (implement in zl3073x) - MCTP support for MCTP over USB v1.1 (DMTF DSP0283) - Power-over-Ethernet: support Realtek PSE controllers - Remove the IBM EHEA driver - Remove tulip/xircom_cb driver" * tag 'net-next-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1433 commits) net/mlx5e: do not HW-GRO coalesce small frames net: openvswitch: fix nf_connlabels leak in ovs_ct_init net: add missing ref_tracker_dir_exit() to alloc_netdev_mqs() net: openvswitch: fix flow mask use-after-free on flow deletion sctp: stop processing a packet once its association is deleted dpll: zl3073x: add PTP clock support dpll: zl3073x: add channel ToD, phase step and TIE operations dpll: zl3073x: scale poll interval proportionally to timeout ptp: vmclock: prevent read-only mappings from becoming writable ipv4: reject undersized MTUs in ip_do_fragment() bonding: initialize err for empty target lists net: dsa: initial support for MT7628 embedded switch net: dsa: initial MT7628 tagging driver net: phy: mediatek: add phy driver for MT7628 built-in Fast Ethernet PHYs dt-bindings: net: dsa: add MT7628 ESW net: pse-pd: realtek-pse-mcu: add UART transport net: pse-pd: realtek-pse-mcu: add I2C transport net: pse-pd: add Realtek PSE MCU core dt-bindings: net: pse-pd: add bindings for Realtek PSE MCU vsock: use sock_error() to consume sk_err after a failed connect ...

net: add sockopt_init_user() for getsockopt conversion

2026-07-02T10:29:06+00:00

Add a helper that initializes a user-backed sockopt_t from the (optval, optlen) __user pair passed to a getsockopt() callback. It is used by transitional __user getsockopt wrappers while the proto-layer getsockopt callbacks are converted to take a sockopt_t, and is removed once the conversion is complete. The goal is to help to convert leafs. Example: sock_common_getsockopt(... char __user *optval, int __user *optlen) → udp_getsockopt(sk, level, optname, optval__user, optlen__user) → udp_lib_getsockopt(sk, level, optname, &opt) /* needs a sockopt_t */ Signed-off-by: Breno Leitao Acked-by: Stanislav Fomichev Acked-by: Willem de Bruijn Link: https://patch.msgid.link/20260630-getsockopt_phase2-v2-1-193335f3d4d1@debian.org Signed-off-by: Paolo Abeni

fs: Add bpf_sock_read_xattr() kfunc to read socket xattrs

2026-06-29T08:31:14+00:00

In c8db08110cbe ("Merge tag 'vfs-7.1-rc1.xattr' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs") we added support for extended attributes for sockets. This comes in two flavors: sockfs and non-sockfs/filesystem sockets. Filesystem sockets are actual filesystem objects so reading xattrs must use dedicated fs helpers such as bpf_get_dentry_xattr() and bpf_get_file_xattr(). Those are inherently sleeping operations. Sockfs sockets on the other hand don't need to use sleeping operations as the underlying data structure is lockless. In addition, retrieval of sockfs extended attributes often happens from LSM hooks that only provide struct socket and it's completely nonsensical to grab a reference to a file, then force a sleeping operation to retrieve the xattr and drop the reference. We know that the sockfs file cannot go away while the LSM hook runs. This series adds a bpf_sock_read_xattr() kfunc that, given a struct socket, reads a user.* extended attribute from the socket's sockfs inode into a bpf_dynptr. Together with fsetxattr() from userspace this lets a process label a socket with a user.* xattr and have a BPF LSM program retrieve that label locklessly. The kfunc mirrors the existing bpf_cgroup_read_xattr(), including the restriction to the user.* namespace. systemd uses user.* xattrs on sockets to implement socket rate limiting and to tag sockets for other purposes [1] such as implementing a varlink registry. There is currently no efficient way for a BPF program to read those labels back. The new helper allows a listening socket marked with an extended attribute to be read back during bind/connect and then act on the connect()ing socket. Extended attributes make it possible to allow an unprivileged user manager such as systemd --user to mark sockets from userspace and then rediscover them or implement policies. The kfunc is registered KF_RCU and only for BPF LSM programs. A struct socket is only guaranteed to live in sockfs when an LSM socket hook hands it out, which is what keeps SOCK_INODE() valid. Sockets that embed struct socket outside sockfs (tun, tap) are only reachable from tracing programs and are excluded by the registration. (Btw, for consistency it would be nice to force allocation of struct socket from sockfs instead of simply embedding it in e.g., struct tun_file which makes the SOCKFS_I() pattern a hazard - at least outside of sockfs functions.) The read never sleeps and takes no lock. For sockfs the value lives in the inode's in-memory xattr store and simple_xattr_get() resolves it with an RCU-protected rhashtable lookup, taking neither the inode lock nor any xattr lock. The kfunc is therefore usable from both sleepable and non-sleepable LSM hooks. Link: https://github.com/systemd/systemd/pull/40559 [1] Link: https://patch.msgid.link/20260617-work-bpf-sock-xattr-v1-1-a1276f7c9da3@kernel.org Signed-off-by: Christian Brauner (Amutable)

net: add getsockopt_iter callback to proto_ops

2026-04-13T21:56:28+00:00

Add a new getsockopt_iter callback to struct proto_ops that uses sockopt_t, a type-safe wrapper around iov_iter. This provides a clean interface for socket option operations that works with both user and kernel buffers. The sockopt_t type encapsulates an iov_iter and an optlen field. The optlen field, although not suggested by Linus, serves as both input (buffer size) and output (returned data size), allowing callbacks to return random values independent of the bytes written via copy_to_iter(), so, keep it separated from iov_iter.count. This is preparatory work for removing the SOL_SOCKET level restriction from io_uring getsockopt operations. Keep in mind that both iter_out and iter_in always point to the same data at all times, and we just have two of them to make the callback implementation sane. Suggested-by: Linus Torvalds Signed-off-by: Breno Leitao Acked-by: Stanislav Fomichev Link: https://patch.msgid.link/20260408-getsockopt-v3-1-061bb9cb355d@debian.org Signed-off-by: Jakub Kicinski

tcp: update window_clamp when SO_RCVBUF is set

2026-04-13T13:32:35+00:00

Commit under Fixes moved recomputing the window clamp to tcp_measure_rcv_mss() (when scaling_ratio changes). I suspect it missed the fact that we don't recompute the clamp when rcvbuf is set. Until scaling_ratio changes we are stuck with the old window clamp which may be based on the small initial buffer. scaling_ratio may never change. Inspired by Eric's recent commit d1361840f8c5 ("tcp: fix SO_RCVLOWAT and RCVBUF autotuning") plumb the user action thru to TCP and have it update the clamp. A smaller fix would be to just have tcp_rcvbuf_grow() adjust the clamp even if SOCK_RCVBUF_LOCK is set. But IIUC this is what we were trying to get away from in the first place. Fixes: a2cbb1603943 ("tcp: Update window clamping condition") Signed-off-by: Jakub Kicinski Reviewed-by: Eric Dumazet Link: https://patch.msgid.link/20260408001438.129165-1-kuba@kernel.org Signed-off-by: Paolo Abeni

tcp: Initialise ehash secrets during connect() and listen().

2026-03-06T02:50:05+00:00

inet_ehashfn() and inet6_ehashfn() initialise random secrets on the first call by net_get_random_once(). While the init part is patched out using static keys, with CONFIG_STACKPROTECTOR_STRONG=y, this causes a compiler to generate a stack canary due to an automatic variable, unsigned long ___flags, in the DO_ONCE() macro being passed to __do_once_start(). With FDO, this is visible in __inet_lookup_established() and __inet6_lookup_established() too. Let's initialise the secrets by get_random_sleepable_once() in the slow paths: inet_hash() for listen(), and inet_hash_connect() and inet6_hash_connect() for connect(). Note that IPv6 listener will initialise both IPv4 & IPv6 secrets in inet_hash() for IPv4-mapped IPv6 address. With the patch, the stack size is reduced by 16 bytes (___flags + a stack canary) and NOPs for the static key go away. Before: __inet6_lookup_established() ... push %rbx sub $0x38,%rsp # stack is 56 bytes mov %edx,%ebx # sport mov %gs:0x299419f(%rip),%rax # load stack canary mov %rax,0x30(%rsp) and store it onto stack mov 0x440(%rdi),%r15 # net->ipv4.tcp_death_row.hashinfo nop 32: mov %r8d,%ebp # hnum shl $0x10,%ebp # hnum << 16 nop 3d: mov 0x70(%rsp),%r14d # sdif or %ebx,%ebp # INET_COMBINED_PORTS(sport, hnum) mov 0x11a8382(%rip),%eax # inet6_ehashfn() ... After: __inet6_lookup_established() ... push %rbx sub $0x28,%rsp # stack is 40 bytes mov 0x60(%rsp),%ebp # sdif mov %r8d,%r14d # hnum shl $0x10,%r14d # hnum << 16 or %edx,%r14d # INET_COMBINED_PORTS(sport, hnum) mov 0x440(%rdi),%rax # net->ipv4.tcp_death_row.hashinfo mov 0x1194f09(%rip),%r10d # inet6_ehashfn() ... Suggested-by: Eric Dumazet Signed-off-by: Kuniyuki Iwashima Reviewed-by: Eric Dumazet Link: https://patch.msgid.link/20260303235424.3877267-1-kuniyu@google.com Signed-off-by: Jakub Kicinski

net: Remove struct sockaddr from net.h

2025-11-05T03:10:33+00:00

Now that struct sockaddr is no longer used by net.h, remove it. Signed-off-by: Kees Cook Link: https://patch.msgid.link/20251104002617.2752303-4-kees@kernel.org Signed-off-by: Jakub Kicinski

net: Convert proto_ops connect() callbacks to use sockaddr_unsized

2025-11-05T03:10:32+00:00

Update all struct proto_ops connect() callback function prototypes from "struct sockaddr *" to "struct sockaddr_unsized *" to avoid lying to the compiler about object sizes. Calls into struct proto handlers gain casts that will be removed in the struct proto conversion patch. No binary changes expected. Signed-off-by: Kees Cook Link: https://patch.msgid.link/20251104002617.2752303-3-kees@kernel.org Signed-off-by: Jakub Kicinski

net: Convert proto_ops bind() callbacks to use sockaddr_unsized

2025-11-05T03:10:32+00:00

Update all struct proto_ops bind() callback function prototypes from "struct sockaddr *" to "struct sockaddr_unsized *" to avoid lying to the compiler about object sizes. Calls into struct proto handlers gain casts that will be removed in the struct proto conversion patch. No binary changes expected. Signed-off-by: Kees Cook Link: https://patch.msgid.link/20251104002617.2752303-2-kees@kernel.org Signed-off-by: Jakub Kicinski

Merge tag 'net-next-6.16' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next

2025-05-28T22:24:36+00:00

Pull networking updates from Paolo Abeni: "Core: - Implement the Device Memory TCP transmit path, allowing zero-copy data transmission on top of TCP from e.g. GPU memory to the wire. - Move all the IPv6 routing tables management outside the RTNL scope, under its own lock and RCU. The route control path is now 3x times faster. - Convert queue related netlink ops to instance lock, reducing again the scope of the RTNL lock. This improves the control plane scalability. - Refactor the software crc32c implementation, removing unneeded abstraction layers and improving significantly the related micro-benchmarks. - Optimize the GRO engine for UDP-tunneled traffic, for a 10% performance improvement in related stream tests. - Cover more per-CPU storage with local nested BH locking; this is a prep work to remove the current per-CPU lock in local_bh_disable() on PREMPT_RT. - Introduce and use nlmsg_payload helper, combining buffer bounds verification with accessing payload carried by netlink messages. Netfilter: - Rewrite the procfs conntrack table implementation, improving considerably the dump performance. A lot of user-space tools still use this interface. - Implement support for wildcard netdevice in netdev basechain and flowtables. - Integrate conntrack information into nft trace infrastructure. - Export set count and backend name to userspace, for better introspection. BPF: - BPF qdisc support: BPF-qdisc can be implemented with BPF struct_ops programs and can be controlled in similar way to traditional qdiscs using the "tc qdisc" command. - Refactor the UDP socket iterator, addressing long standing issues WRT duplicate hits or missed sockets. Protocols: - Improve TCP receive buffer auto-tuning and increase the default upper bound for the receive buffer; overall this improves the single flow maximum thoughput on 200Gbs link by over 60%. - Add AFS GSSAPI security class to AF_RXRPC; it provides transport security for connections to the AFS fileserver and VL server. - Improve TCP multipath routing, so that the sources address always matches the nexthop device. - Introduce SO_PASSRIGHTS for AF_UNIX, to allow disabling SCM_RIGHTS, and thus preventing DoS caused by passing around problematic FDs. - Retire DCCP socket. DCCP only receives updates for bugs, and major distros disable it by default. Its removal allows for better organisation of TCP fields to reduce the number of cache lines hit in the fast path. - Extend TCP drop-reason support to cover PAWS checks. Driver API: - Reorganize PTP ioctl flag support to require an explicit opt-in for the drivers, avoiding the problem of drivers not rejecting new unsupported flags. - Converted several device drivers to timestamping APIs. - Introduce per-PHY ethtool dump helpers, improving the support for dump operations targeting PHYs. Tests and tooling: - Add support for classic netlink in user space C codegen, so that ynl-c can now read, create and modify links, routes addresses and qdisc layer configuration. - Add ynl sub-types for binary attributes, allowing ynl-c to output known struct instead of raw binary data, clarifying the classic netlink output. - Extend MPTCP selftests to improve the code-coverage. - Add tests for XDP tail adjustment in AF_XDP. New hardware / drivers: - OpenVPN virtual driver: offload OpenVPN data channels processing to the kernel-space, increasing the data transfer throughput WRT the user-space implementation. - Renesas glue driver for the gigabit ethernet RZ/V2H(P) SoC. - Broadcom asp-v3.0 ethernet driver. - AMD Renoir ethernet device. - ReakTek MT9888 2.5G ethernet PHY driver. - Aeonsemi 10G C45 PHYs driver. Drivers: - Ethernet high-speed NICs: - nVidia/Mellanox (mlx5): - refactor the steering table handling to significantly reduce the amount of memory used - add support for complex matches in H/W flow steering - improve flow streeing error handling - convert to netdev instance locking - Intel (100G, ice, igb, ixgbe, idpf): - ice: add switchdev support for LLDP traffic over VF - ixgbe: add firmware manipulation and regions devlink support - igb: introduce support for frame transmission premption - igb: adds persistent NAPI configuration - idpf: introduce RDMA support - idpf: add initial PTP support - Meta (fbnic): - extend hardware stats coverage - add devlink dev flash support - Broadcom (bnxt): - add support for RX-side device memory TCP - Wangxun (txgbe): - implement support for udp tunnel offload - complete PTP and SRIOV support for AML 25G/10G devices - Ethernet NICs embedded and virtual: - Google (gve): - add device memory TCP TX support - Amazon (ena): - support persistent per-NAPI config - Airoha: - add H/W support for L2 traffic offload - add per flow stats for flow offloading - RealTek (rtl8211): add support for WoL magic packet - Synopsys (stmmac): - dwmac-socfpga 1000BaseX support - add Loongson-2K3000 support - introduce support for hardware-accelerated VLAN stripping - Broadcom (bcmgenet): - expose more H/W stats - Freescale (enetc, dpaa2-eth): - enetc: add MAC filter, VLAN filter RSS and loopback support - dpaa2-eth: convert to H/W timestamping APIs - vxlan: convert FDB table to rhashtable, for better scalabilty - veth: apply qdisc backpressure on full ring to reduce TX drops - Ethernet switches: - Microchip (kzZ88x3): add ETS scheduler support - Ethernet PHYs: - RealTek (rtl8211): - add support for WoL magic packet - add support for PHY LEDs - CAN: - Adds RZ/G3E CANFD support to the rcar_canfd driver. - Preparatory work for CAN-XL support. - Add self-tests framework with support for CAN physical interfaces. - WiFi: - mac80211: - scan improvements with multi-link operation (MLO) - Qualcomm (ath12k): - enable AHB support for IPQ5332 - add monitor interface support to QCN9274 - add multi-link operation support to WCN7850 - add 802.11d scan offload support to WCN7850 - monitor mode for WCN7850, better 6 GHz regulatory - Qualcomm (ath11k): - restore hibernation support - MediaTek (mt76): - WiFi-7 improvements - implement support for mt7990 - Intel (iwlwifi): - enhanced multi-link single-radio (EMLSR) support on 5 GHz links - rework device configuration - RealTek (rtw88): - improve throughput for RTL8814AU - RealTek (rtw89): - add multi-link operation support - STA/P2P concurrency improvements - support different SAR configs by antenna - Bluetooth: - introduce HCI Driver protocol - btintel_pcie: do not generate coredump for diagnostic events - btusb: add HCI Drv commands for configuring altsetting - btusb: add RTL8851BE device 0x0bda:0xb850 - btusb: add new VID/PID 13d3/3584 for MT7922 - btusb: add new VID/PID 13d3/3630 and 13d3/3613 for MT7925 - btnxpuart: implement host-wakeup feature" * tag 'net-next-6.16' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1611 commits) selftests/bpf: Fix bpf selftest build warning selftests: netfilter: Fix skip of wildcard interface test net: phy: mscc: Stop clearing the the UDPv4 checksum for L2 frames net: openvswitch: Fix the dead loop of MPLS parse calipso: Don't call calipso functions for AF_INET sk. selftests/tc-testing: Add a test for HFSC eltree double add with reentrant enqueue behaviour on netem net_sched: hfsc: Address reentrant enqueue adding class to eltree twice octeontx2-pf: QOS: Refactor TC_HTB_LEAF_DEL_LAST callback octeontx2-pf: QOS: Perform cache sync on send queue teardown net: mana: Add support for Multi Vports on Bare metal net: devmem: ncdevmem: remove unused variable net: devmem: ksft: upgrade rx test to send 1K data net: devmem: ksft: add 5 tuple FS support net: devmem: ksft: add exit_wait to make rx test pass net: devmem: ksft: add ipv4 support net: devmem: preserve sockc_err page_pool: fix ugly page_pool formatting net: devmem: move list_add to net_devmem_bind_dmabuf. selftests: netfilter: nft_queue.sh: include file transfer duration in log message net: phy: mscc: Fix memory leak when using one step timestamping ...