From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- net/ax25/ax25_std_in.c | 443 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 443 insertions(+) create mode 100644 net/ax25/ax25_std_in.c (limited to 'net/ax25/ax25_std_in.c') diff --git a/net/ax25/ax25_std_in.c b/net/ax25/ax25_std_in.c new file mode 100644 index 000000000..ba176196a --- /dev/null +++ b/net/ax25/ax25_std_in.c @@ -0,0 +1,443 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * + * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk) + * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) + * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de) + * Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de) + * + * Most of this code is based on the SDL diagrams published in the 7th ARRL + * Computer Networking Conference papers. The diagrams have mistakes in them, + * but are mostly correct. Before you modify the code could you read the SDL + * diagrams as the code is not obvious and probably very easy to break. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * State machine for state 1, Awaiting Connection State. + * The handling of the timer(s) is in file ax25_std_timer.c. + * Handling of state 0 and connection release is in ax25.c. + */ +static int ax25_std_state1_machine(ax25_cb *ax25, struct sk_buff *skb, int frametype, int pf, int type) +{ + switch (frametype) { + case AX25_SABM: + ax25->modulus = AX25_MODULUS; + ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW]; + ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE); + break; + + case AX25_SABME: + ax25->modulus = AX25_EMODULUS; + ax25->window = ax25->ax25_dev->values[AX25_VALUES_EWINDOW]; + ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE); + break; + + case AX25_DISC: + ax25_send_control(ax25, AX25_DM, pf, AX25_RESPONSE); + break; + + case AX25_UA: + if (pf) { + ax25_calculate_rtt(ax25); + ax25_stop_t1timer(ax25); + ax25_start_t3timer(ax25); + ax25_start_idletimer(ax25); + ax25->vs = 0; + ax25->va = 0; + ax25->vr = 0; + ax25->state = AX25_STATE_3; + ax25->n2count = 0; + if (ax25->sk != NULL) { + bh_lock_sock(ax25->sk); + ax25->sk->sk_state = TCP_ESTABLISHED; + /* For WAIT_SABM connections we will produce an accept ready socket here */ + if (!sock_flag(ax25->sk, SOCK_DEAD)) + ax25->sk->sk_state_change(ax25->sk); + bh_unlock_sock(ax25->sk); + } + } + break; + + case AX25_DM: + if (pf) { + if (ax25->modulus == AX25_MODULUS) { + ax25_disconnect(ax25, ECONNREFUSED); + } else { + ax25->modulus = AX25_MODULUS; + ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW]; + } + } + break; + + default: + break; + } + + return 0; +} + +/* + * State machine for state 2, Awaiting Release State. + * The handling of the timer(s) is in file ax25_std_timer.c + * Handling of state 0 and connection release is in ax25.c. + */ +static int ax25_std_state2_machine(ax25_cb *ax25, struct sk_buff *skb, int frametype, int pf, int type) +{ + switch (frametype) { + case AX25_SABM: + case AX25_SABME: + ax25_send_control(ax25, AX25_DM, pf, AX25_RESPONSE); + break; + + case AX25_DISC: + ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE); + ax25_disconnect(ax25, 0); + break; + + case AX25_DM: + case AX25_UA: + if (pf) + ax25_disconnect(ax25, 0); + break; + + case AX25_I: + case AX25_REJ: + case AX25_RNR: + case AX25_RR: + if (pf) ax25_send_control(ax25, AX25_DM, AX25_POLLON, AX25_RESPONSE); + break; + + default: + break; + } + + return 0; +} + +/* + * State machine for state 3, Connected State. + * The handling of the timer(s) is in file ax25_std_timer.c + * Handling of state 0 and connection release is in ax25.c. + */ +static int ax25_std_state3_machine(ax25_cb *ax25, struct sk_buff *skb, int frametype, int ns, int nr, int pf, int type) +{ + int queued = 0; + + switch (frametype) { + case AX25_SABM: + case AX25_SABME: + if (frametype == AX25_SABM) { + ax25->modulus = AX25_MODULUS; + ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW]; + } else { + ax25->modulus = AX25_EMODULUS; + ax25->window = ax25->ax25_dev->values[AX25_VALUES_EWINDOW]; + } + ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE); + ax25_stop_t1timer(ax25); + ax25_stop_t2timer(ax25); + ax25_start_t3timer(ax25); + ax25_start_idletimer(ax25); + ax25->condition = 0x00; + ax25->vs = 0; + ax25->va = 0; + ax25->vr = 0; + ax25_requeue_frames(ax25); + break; + + case AX25_DISC: + ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE); + ax25_disconnect(ax25, 0); + break; + + case AX25_DM: + ax25_disconnect(ax25, ECONNRESET); + break; + + case AX25_RR: + case AX25_RNR: + if (frametype == AX25_RR) + ax25->condition &= ~AX25_COND_PEER_RX_BUSY; + else + ax25->condition |= AX25_COND_PEER_RX_BUSY; + if (type == AX25_COMMAND && pf) + ax25_std_enquiry_response(ax25); + if (ax25_validate_nr(ax25, nr)) { + ax25_check_iframes_acked(ax25, nr); + } else { + ax25_std_nr_error_recovery(ax25); + ax25->state = AX25_STATE_1; + } + break; + + case AX25_REJ: + ax25->condition &= ~AX25_COND_PEER_RX_BUSY; + if (type == AX25_COMMAND && pf) + ax25_std_enquiry_response(ax25); + if (ax25_validate_nr(ax25, nr)) { + ax25_frames_acked(ax25, nr); + ax25_calculate_rtt(ax25); + ax25_stop_t1timer(ax25); + ax25_start_t3timer(ax25); + ax25_requeue_frames(ax25); + } else { + ax25_std_nr_error_recovery(ax25); + ax25->state = AX25_STATE_1; + } + break; + + case AX25_I: + if (!ax25_validate_nr(ax25, nr)) { + ax25_std_nr_error_recovery(ax25); + ax25->state = AX25_STATE_1; + break; + } + if (ax25->condition & AX25_COND_PEER_RX_BUSY) { + ax25_frames_acked(ax25, nr); + } else { + ax25_check_iframes_acked(ax25, nr); + } + if (ax25->condition & AX25_COND_OWN_RX_BUSY) { + if (pf) ax25_std_enquiry_response(ax25); + break; + } + if (ns == ax25->vr) { + ax25->vr = (ax25->vr + 1) % ax25->modulus; + queued = ax25_rx_iframe(ax25, skb); + if (ax25->condition & AX25_COND_OWN_RX_BUSY) + ax25->vr = ns; /* ax25->vr - 1 */ + ax25->condition &= ~AX25_COND_REJECT; + if (pf) { + ax25_std_enquiry_response(ax25); + } else { + if (!(ax25->condition & AX25_COND_ACK_PENDING)) { + ax25->condition |= AX25_COND_ACK_PENDING; + ax25_start_t2timer(ax25); + } + } + } else { + if (ax25->condition & AX25_COND_REJECT) { + if (pf) ax25_std_enquiry_response(ax25); + } else { + ax25->condition |= AX25_COND_REJECT; + ax25_send_control(ax25, AX25_REJ, pf, AX25_RESPONSE); + ax25->condition &= ~AX25_COND_ACK_PENDING; + } + } + break; + + case AX25_FRMR: + case AX25_ILLEGAL: + ax25_std_establish_data_link(ax25); + ax25->state = AX25_STATE_1; + break; + + default: + break; + } + + return queued; +} + +/* + * State machine for state 4, Timer Recovery State. + * The handling of the timer(s) is in file ax25_std_timer.c + * Handling of state 0 and connection release is in ax25.c. + */ +static int ax25_std_state4_machine(ax25_cb *ax25, struct sk_buff *skb, int frametype, int ns, int nr, int pf, int type) +{ + int queued = 0; + + switch (frametype) { + case AX25_SABM: + case AX25_SABME: + if (frametype == AX25_SABM) { + ax25->modulus = AX25_MODULUS; + ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW]; + } else { + ax25->modulus = AX25_EMODULUS; + ax25->window = ax25->ax25_dev->values[AX25_VALUES_EWINDOW]; + } + ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE); + ax25_stop_t1timer(ax25); + ax25_stop_t2timer(ax25); + ax25_start_t3timer(ax25); + ax25_start_idletimer(ax25); + ax25->condition = 0x00; + ax25->vs = 0; + ax25->va = 0; + ax25->vr = 0; + ax25->state = AX25_STATE_3; + ax25->n2count = 0; + ax25_requeue_frames(ax25); + break; + + case AX25_DISC: + ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE); + ax25_disconnect(ax25, 0); + break; + + case AX25_DM: + ax25_disconnect(ax25, ECONNRESET); + break; + + case AX25_RR: + case AX25_RNR: + if (frametype == AX25_RR) + ax25->condition &= ~AX25_COND_PEER_RX_BUSY; + else + ax25->condition |= AX25_COND_PEER_RX_BUSY; + if (type == AX25_RESPONSE && pf) { + ax25_stop_t1timer(ax25); + ax25->n2count = 0; + if (ax25_validate_nr(ax25, nr)) { + ax25_frames_acked(ax25, nr); + if (ax25->vs == ax25->va) { + ax25_start_t3timer(ax25); + ax25->state = AX25_STATE_3; + } else { + ax25_requeue_frames(ax25); + } + } else { + ax25_std_nr_error_recovery(ax25); + ax25->state = AX25_STATE_1; + } + break; + } + if (type == AX25_COMMAND && pf) + ax25_std_enquiry_response(ax25); + if (ax25_validate_nr(ax25, nr)) { + ax25_frames_acked(ax25, nr); + } else { + ax25_std_nr_error_recovery(ax25); + ax25->state = AX25_STATE_1; + } + break; + + case AX25_REJ: + ax25->condition &= ~AX25_COND_PEER_RX_BUSY; + if (pf && type == AX25_RESPONSE) { + ax25_stop_t1timer(ax25); + ax25->n2count = 0; + if (ax25_validate_nr(ax25, nr)) { + ax25_frames_acked(ax25, nr); + if (ax25->vs == ax25->va) { + ax25_start_t3timer(ax25); + ax25->state = AX25_STATE_3; + } else { + ax25_requeue_frames(ax25); + } + } else { + ax25_std_nr_error_recovery(ax25); + ax25->state = AX25_STATE_1; + } + break; + } + if (type == AX25_COMMAND && pf) + ax25_std_enquiry_response(ax25); + if (ax25_validate_nr(ax25, nr)) { + ax25_frames_acked(ax25, nr); + ax25_requeue_frames(ax25); + } else { + ax25_std_nr_error_recovery(ax25); + ax25->state = AX25_STATE_1; + } + break; + + case AX25_I: + if (!ax25_validate_nr(ax25, nr)) { + ax25_std_nr_error_recovery(ax25); + ax25->state = AX25_STATE_1; + break; + } + ax25_frames_acked(ax25, nr); + if (ax25->condition & AX25_COND_OWN_RX_BUSY) { + if (pf) + ax25_std_enquiry_response(ax25); + break; + } + if (ns == ax25->vr) { + ax25->vr = (ax25->vr + 1) % ax25->modulus; + queued = ax25_rx_iframe(ax25, skb); + if (ax25->condition & AX25_COND_OWN_RX_BUSY) + ax25->vr = ns; /* ax25->vr - 1 */ + ax25->condition &= ~AX25_COND_REJECT; + if (pf) { + ax25_std_enquiry_response(ax25); + } else { + if (!(ax25->condition & AX25_COND_ACK_PENDING)) { + ax25->condition |= AX25_COND_ACK_PENDING; + ax25_start_t2timer(ax25); + } + } + } else { + if (ax25->condition & AX25_COND_REJECT) { + if (pf) ax25_std_enquiry_response(ax25); + } else { + ax25->condition |= AX25_COND_REJECT; + ax25_send_control(ax25, AX25_REJ, pf, AX25_RESPONSE); + ax25->condition &= ~AX25_COND_ACK_PENDING; + } + } + break; + + case AX25_FRMR: + case AX25_ILLEGAL: + ax25_std_establish_data_link(ax25); + ax25->state = AX25_STATE_1; + break; + + default: + break; + } + + return queued; +} + +/* + * Higher level upcall for a LAPB frame + */ +int ax25_std_frame_in(ax25_cb *ax25, struct sk_buff *skb, int type) +{ + int queued = 0, frametype, ns, nr, pf; + + frametype = ax25_decode(ax25, skb, &ns, &nr, &pf); + + switch (ax25->state) { + case AX25_STATE_1: + queued = ax25_std_state1_machine(ax25, skb, frametype, pf, type); + break; + case AX25_STATE_2: + queued = ax25_std_state2_machine(ax25, skb, frametype, pf, type); + break; + case AX25_STATE_3: + queued = ax25_std_state3_machine(ax25, skb, frametype, ns, nr, pf, type); + break; + case AX25_STATE_4: + queued = ax25_std_state4_machine(ax25, skb, frametype, ns, nr, pf, type); + break; + } + + ax25_kick(ax25); + + return queued; +} -- cgit v1.2.3