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(). ... --- drivers/net/wireguard/peer.c | 239 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 239 insertions(+) create mode 100644 drivers/net/wireguard/peer.c (limited to 'drivers/net/wireguard/peer.c') diff --git a/drivers/net/wireguard/peer.c b/drivers/net/wireguard/peer.c new file mode 100644 index 000000000..1cb502a93 --- /dev/null +++ b/drivers/net/wireguard/peer.c @@ -0,0 +1,239 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2015-2019 Jason A. Donenfeld . All Rights Reserved. + */ + +#include "peer.h" +#include "device.h" +#include "queueing.h" +#include "timers.h" +#include "peerlookup.h" +#include "noise.h" + +#include +#include +#include +#include + +static struct kmem_cache *peer_cache; +static atomic64_t peer_counter = ATOMIC64_INIT(0); + +struct wg_peer *wg_peer_create(struct wg_device *wg, + const u8 public_key[NOISE_PUBLIC_KEY_LEN], + const u8 preshared_key[NOISE_SYMMETRIC_KEY_LEN]) +{ + struct wg_peer *peer; + int ret = -ENOMEM; + + lockdep_assert_held(&wg->device_update_lock); + + if (wg->num_peers >= MAX_PEERS_PER_DEVICE) + return ERR_PTR(ret); + + peer = kmem_cache_zalloc(peer_cache, GFP_KERNEL); + if (unlikely(!peer)) + return ERR_PTR(ret); + if (unlikely(dst_cache_init(&peer->endpoint_cache, GFP_KERNEL))) + goto err; + + peer->device = wg; + wg_noise_handshake_init(&peer->handshake, &wg->static_identity, + public_key, preshared_key, peer); + peer->internal_id = atomic64_inc_return(&peer_counter); + peer->serial_work_cpu = nr_cpumask_bits; + wg_cookie_init(&peer->latest_cookie); + wg_timers_init(peer); + wg_cookie_checker_precompute_peer_keys(peer); + spin_lock_init(&peer->keypairs.keypair_update_lock); + INIT_WORK(&peer->transmit_handshake_work, wg_packet_handshake_send_worker); + INIT_WORK(&peer->transmit_packet_work, wg_packet_tx_worker); + wg_prev_queue_init(&peer->tx_queue); + wg_prev_queue_init(&peer->rx_queue); + rwlock_init(&peer->endpoint_lock); + kref_init(&peer->refcount); + skb_queue_head_init(&peer->staged_packet_queue); + wg_noise_reset_last_sent_handshake(&peer->last_sent_handshake); + set_bit(NAPI_STATE_NO_BUSY_POLL, &peer->napi.state); + netif_napi_add(wg->dev, &peer->napi, wg_packet_rx_poll); + napi_enable(&peer->napi); + list_add_tail(&peer->peer_list, &wg->peer_list); + INIT_LIST_HEAD(&peer->allowedips_list); + wg_pubkey_hashtable_add(wg->peer_hashtable, peer); + ++wg->num_peers; + pr_debug("%s: Peer %llu created\n", wg->dev->name, peer->internal_id); + return peer; + +err: + kmem_cache_free(peer_cache, peer); + return ERR_PTR(ret); +} + +struct wg_peer *wg_peer_get_maybe_zero(struct wg_peer *peer) +{ + RCU_LOCKDEP_WARN(!rcu_read_lock_bh_held(), + "Taking peer reference without holding the RCU read lock"); + if (unlikely(!peer || !kref_get_unless_zero(&peer->refcount))) + return NULL; + return peer; +} + +static void peer_make_dead(struct wg_peer *peer) +{ + /* Remove from configuration-time lookup structures. */ + list_del_init(&peer->peer_list); + wg_allowedips_remove_by_peer(&peer->device->peer_allowedips, peer, + &peer->device->device_update_lock); + wg_pubkey_hashtable_remove(peer->device->peer_hashtable, peer); + + /* Mark as dead, so that we don't allow jumping contexts after. */ + WRITE_ONCE(peer->is_dead, true); + + /* The caller must now synchronize_net() for this to take effect. */ +} + +static void peer_remove_after_dead(struct wg_peer *peer) +{ + WARN_ON(!peer->is_dead); + + /* No more keypairs can be created for this peer, since is_dead protects + * add_new_keypair, so we can now destroy existing ones. + */ + wg_noise_keypairs_clear(&peer->keypairs); + + /* Destroy all ongoing timers that were in-flight at the beginning of + * this function. + */ + wg_timers_stop(peer); + + /* The transition between packet encryption/decryption queues isn't + * guarded by is_dead, but each reference's life is strictly bounded by + * two generations: once for parallel crypto and once for serial + * ingestion, so we can simply flush twice, and be sure that we no + * longer have references inside these queues. + */ + + /* a) For encrypt/decrypt. */ + flush_workqueue(peer->device->packet_crypt_wq); + /* b.1) For send (but not receive, since that's napi). */ + flush_workqueue(peer->device->packet_crypt_wq); + /* b.2.1) For receive (but not send, since that's wq). */ + napi_disable(&peer->napi); + /* b.2.1) It's now safe to remove the napi struct, which must be done + * here from process context. + */ + netif_napi_del(&peer->napi); + + /* Ensure any workstructs we own (like transmit_handshake_work or + * clear_peer_work) no longer are in use. + */ + flush_workqueue(peer->device->handshake_send_wq); + + /* After the above flushes, a peer might still be active in a few + * different contexts: 1) from xmit(), before hitting is_dead and + * returning, 2) from wg_packet_consume_data(), before hitting is_dead + * and returning, 3) from wg_receive_handshake_packet() after a point + * where it has processed an incoming handshake packet, but where + * all calls to pass it off to timers fails because of is_dead. We won't + * have new references in (1) eventually, because we're removed from + * allowedips; we won't have new references in (2) eventually, because + * wg_index_hashtable_lookup will always return NULL, since we removed + * all existing keypairs and no more can be created; we won't have new + * references in (3) eventually, because we're removed from the pubkey + * hash table, which allows for a maximum of one handshake response, + * via the still-uncleared index hashtable entry, but not more than one, + * and in wg_cookie_message_consume, the lookup eventually gets a peer + * with a refcount of zero, so no new reference is taken. + */ + + --peer->device->num_peers; + wg_peer_put(peer); +} + +/* We have a separate "remove" function make sure that all active places where + * a peer is currently operating will eventually come to an end and not pass + * their reference onto another context. + */ +void wg_peer_remove(struct wg_peer *peer) +{ + if (unlikely(!peer)) + return; + lockdep_assert_held(&peer->device->device_update_lock); + + peer_make_dead(peer); + synchronize_net(); + peer_remove_after_dead(peer); +} + +void wg_peer_remove_all(struct wg_device *wg) +{ + struct wg_peer *peer, *temp; + LIST_HEAD(dead_peers); + + lockdep_assert_held(&wg->device_update_lock); + + /* Avoid having to traverse individually for each one. */ + wg_allowedips_free(&wg->peer_allowedips, &wg->device_update_lock); + + list_for_each_entry_safe(peer, temp, &wg->peer_list, peer_list) { + peer_make_dead(peer); + list_add_tail(&peer->peer_list, &dead_peers); + } + synchronize_net(); + list_for_each_entry_safe(peer, temp, &dead_peers, peer_list) + peer_remove_after_dead(peer); +} + +static void rcu_release(struct rcu_head *rcu) +{ + struct wg_peer *peer = container_of(rcu, struct wg_peer, rcu); + + dst_cache_destroy(&peer->endpoint_cache); + WARN_ON(wg_prev_queue_peek(&peer->tx_queue) || wg_prev_queue_peek(&peer->rx_queue)); + + /* The final zeroing takes care of clearing any remaining handshake key + * material and other potentially sensitive information. + */ + memzero_explicit(peer, sizeof(*peer)); + kmem_cache_free(peer_cache, peer); +} + +static void kref_release(struct kref *refcount) +{ + struct wg_peer *peer = container_of(refcount, struct wg_peer, refcount); + + pr_debug("%s: Peer %llu (%pISpfsc) destroyed\n", + peer->device->dev->name, peer->internal_id, + &peer->endpoint.addr); + + /* Remove ourself from dynamic runtime lookup structures, now that the + * last reference is gone. + */ + wg_index_hashtable_remove(peer->device->index_hashtable, + &peer->handshake.entry); + + /* Remove any lingering packets that didn't have a chance to be + * transmitted. + */ + wg_packet_purge_staged_packets(peer); + + /* Free the memory used. */ + call_rcu(&peer->rcu, rcu_release); +} + +void wg_peer_put(struct wg_peer *peer) +{ + if (unlikely(!peer)) + return; + kref_put(&peer->refcount, kref_release); +} + +int __init wg_peer_init(void) +{ + peer_cache = KMEM_CACHE(wg_peer, 0); + return peer_cache ? 0 : -ENOMEM; +} + +void wg_peer_uninit(void) +{ + kmem_cache_destroy(peer_cache); +} -- cgit v1.2.3