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/x25/x25_out.c | 226 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 226 insertions(+) create mode 100644 net/x25/x25_out.c (limited to 'net/x25/x25_out.c') diff --git a/net/x25/x25_out.c b/net/x25/x25_out.c new file mode 100644 index 000000000..dbc0940bf --- /dev/null +++ b/net/x25/x25_out.c @@ -0,0 +1,226 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * X.25 Packet Layer release 002 + * + * This is ALPHA test software. This code may break your machine, + * randomly fail to work with new releases, misbehave and/or generally + * screw up. It might even work. + * + * This code REQUIRES 2.1.15 or higher + * + * History + * X.25 001 Jonathan Naylor Started coding. + * X.25 002 Jonathan Naylor New timer architecture. + * 2000-09-04 Henner Eisen Prevented x25_output() skb leakage. + * 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation. + * 2000-11-10 Henner Eisen x25_send_iframe(): re-queued frames + * needed cleaned seq-number fields. + */ + +#include +#include +#include +#include +#include +#include +#include + +static int x25_pacsize_to_bytes(unsigned int pacsize) +{ + int bytes = 1; + + if (!pacsize) + return 128; + + while (pacsize-- > 0) + bytes *= 2; + + return bytes; +} + +/* + * This is where all X.25 information frames pass. + * + * Returns the amount of user data bytes sent on success + * or a negative error code on failure. + */ +int x25_output(struct sock *sk, struct sk_buff *skb) +{ + struct sk_buff *skbn; + unsigned char header[X25_EXT_MIN_LEN]; + int err, frontlen, len; + int sent=0, noblock = X25_SKB_CB(skb)->flags & MSG_DONTWAIT; + struct x25_sock *x25 = x25_sk(sk); + int header_len = x25->neighbour->extended ? X25_EXT_MIN_LEN : + X25_STD_MIN_LEN; + int max_len = x25_pacsize_to_bytes(x25->facilities.pacsize_out); + + if (skb->len - header_len > max_len) { + /* Save a copy of the Header */ + skb_copy_from_linear_data(skb, header, header_len); + skb_pull(skb, header_len); + + frontlen = skb_headroom(skb); + + while (skb->len > 0) { + release_sock(sk); + skbn = sock_alloc_send_skb(sk, frontlen + max_len, + noblock, &err); + lock_sock(sk); + if (!skbn) { + if (err == -EWOULDBLOCK && noblock){ + kfree_skb(skb); + return sent; + } + SOCK_DEBUG(sk, "x25_output: fragment alloc" + " failed, err=%d, %d bytes " + "sent\n", err, sent); + return err; + } + + skb_reserve(skbn, frontlen); + + len = max_len > skb->len ? skb->len : max_len; + + /* Copy the user data */ + skb_copy_from_linear_data(skb, skb_put(skbn, len), len); + skb_pull(skb, len); + + /* Duplicate the Header */ + skb_push(skbn, header_len); + skb_copy_to_linear_data(skbn, header, header_len); + + if (skb->len > 0) { + if (x25->neighbour->extended) + skbn->data[3] |= X25_EXT_M_BIT; + else + skbn->data[2] |= X25_STD_M_BIT; + } + + skb_queue_tail(&sk->sk_write_queue, skbn); + sent += len; + } + + kfree_skb(skb); + } else { + skb_queue_tail(&sk->sk_write_queue, skb); + sent = skb->len - header_len; + } + return sent; +} + +/* + * This procedure is passed a buffer descriptor for an iframe. It builds + * the rest of the control part of the frame and then writes it out. + */ +static void x25_send_iframe(struct sock *sk, struct sk_buff *skb) +{ + struct x25_sock *x25 = x25_sk(sk); + + if (!skb) + return; + + if (x25->neighbour->extended) { + skb->data[2] = (x25->vs << 1) & 0xFE; + skb->data[3] &= X25_EXT_M_BIT; + skb->data[3] |= (x25->vr << 1) & 0xFE; + } else { + skb->data[2] &= X25_STD_M_BIT; + skb->data[2] |= (x25->vs << 1) & 0x0E; + skb->data[2] |= (x25->vr << 5) & 0xE0; + } + + x25_transmit_link(skb, x25->neighbour); +} + +void x25_kick(struct sock *sk) +{ + struct sk_buff *skb, *skbn; + unsigned short start, end; + int modulus; + struct x25_sock *x25 = x25_sk(sk); + + if (x25->state != X25_STATE_3) + return; + + /* + * Transmit interrupt data. + */ + if (skb_peek(&x25->interrupt_out_queue) != NULL && + !test_and_set_bit(X25_INTERRUPT_FLAG, &x25->flags)) { + + skb = skb_dequeue(&x25->interrupt_out_queue); + x25_transmit_link(skb, x25->neighbour); + } + + if (x25->condition & X25_COND_PEER_RX_BUSY) + return; + + if (!skb_peek(&sk->sk_write_queue)) + return; + + modulus = x25->neighbour->extended ? X25_EMODULUS : X25_SMODULUS; + + start = skb_peek(&x25->ack_queue) ? x25->vs : x25->va; + end = (x25->va + x25->facilities.winsize_out) % modulus; + + if (start == end) + return; + + x25->vs = start; + + /* + * Transmit data until either we're out of data to send or + * the window is full. + */ + + skb = skb_dequeue(&sk->sk_write_queue); + + do { + if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) { + skb_queue_head(&sk->sk_write_queue, skb); + break; + } + + skb_set_owner_w(skbn, sk); + + /* + * Transmit the frame copy. + */ + x25_send_iframe(sk, skbn); + + x25->vs = (x25->vs + 1) % modulus; + + /* + * Requeue the original data frame. + */ + skb_queue_tail(&x25->ack_queue, skb); + + } while (x25->vs != end && + (skb = skb_dequeue(&sk->sk_write_queue)) != NULL); + + x25->vl = x25->vr; + x25->condition &= ~X25_COND_ACK_PENDING; + + x25_stop_timer(sk); +} + +/* + * The following routines are taken from page 170 of the 7th ARRL Computer + * Networking Conference paper, as is the whole state machine. + */ + +void x25_enquiry_response(struct sock *sk) +{ + struct x25_sock *x25 = x25_sk(sk); + + if (x25->condition & X25_COND_OWN_RX_BUSY) + x25_write_internal(sk, X25_RNR); + else + x25_write_internal(sk, X25_RR); + + x25->vl = x25->vr; + x25->condition &= ~X25_COND_ACK_PENDING; + + x25_stop_timer(sk); +} -- cgit v1.2.3