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/bridge/br.c | 471 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 471 insertions(+) create mode 100644 net/bridge/br.c (limited to 'net/bridge/br.c') diff --git a/net/bridge/br.c b/net/bridge/br.c new file mode 100644 index 000000000..4f5098d33 --- /dev/null +++ b/net/bridge/br.c @@ -0,0 +1,471 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Generic parts + * Linux ethernet bridge + * + * Authors: + * Lennert Buytenhek + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "br_private.h" + +/* + * Handle changes in state of network devices enslaved to a bridge. + * + * Note: don't care about up/down if bridge itself is down, because + * port state is checked when bridge is brought up. + */ +static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr) +{ + struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr); + struct netdev_notifier_pre_changeaddr_info *prechaddr_info; + struct net_device *dev = netdev_notifier_info_to_dev(ptr); + struct net_bridge_port *p; + struct net_bridge *br; + bool notified = false; + bool changed_addr; + int err; + + if (netif_is_bridge_master(dev)) { + err = br_vlan_bridge_event(dev, event, ptr); + if (err) + return notifier_from_errno(err); + + if (event == NETDEV_REGISTER) { + /* register of bridge completed, add sysfs entries */ + err = br_sysfs_addbr(dev); + if (err) + return notifier_from_errno(err); + + return NOTIFY_DONE; + } + } + + /* not a port of a bridge */ + p = br_port_get_rtnl(dev); + if (!p) + return NOTIFY_DONE; + + br = p->br; + + switch (event) { + case NETDEV_CHANGEMTU: + br_mtu_auto_adjust(br); + break; + + case NETDEV_PRE_CHANGEADDR: + if (br->dev->addr_assign_type == NET_ADDR_SET) + break; + prechaddr_info = ptr; + err = dev_pre_changeaddr_notify(br->dev, + prechaddr_info->dev_addr, + extack); + if (err) + return notifier_from_errno(err); + break; + + case NETDEV_CHANGEADDR: + spin_lock_bh(&br->lock); + br_fdb_changeaddr(p, dev->dev_addr); + changed_addr = br_stp_recalculate_bridge_id(br); + spin_unlock_bh(&br->lock); + + if (changed_addr) + call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev); + + break; + + case NETDEV_CHANGE: + br_port_carrier_check(p, ¬ified); + break; + + case NETDEV_FEAT_CHANGE: + netdev_update_features(br->dev); + break; + + case NETDEV_DOWN: + spin_lock_bh(&br->lock); + if (br->dev->flags & IFF_UP) { + br_stp_disable_port(p); + notified = true; + } + spin_unlock_bh(&br->lock); + break; + + case NETDEV_UP: + if (netif_running(br->dev) && netif_oper_up(dev)) { + spin_lock_bh(&br->lock); + br_stp_enable_port(p); + notified = true; + spin_unlock_bh(&br->lock); + } + break; + + case NETDEV_UNREGISTER: + br_del_if(br, dev); + break; + + case NETDEV_CHANGENAME: + err = br_sysfs_renameif(p); + if (err) + return notifier_from_errno(err); + break; + + case NETDEV_PRE_TYPE_CHANGE: + /* Forbid underlying device to change its type. */ + return NOTIFY_BAD; + + case NETDEV_RESEND_IGMP: + /* Propagate to master device */ + call_netdevice_notifiers(event, br->dev); + break; + } + + if (event != NETDEV_UNREGISTER) + br_vlan_port_event(p, event); + + /* Events that may cause spanning tree to refresh */ + if (!notified && (event == NETDEV_CHANGEADDR || event == NETDEV_UP || + event == NETDEV_CHANGE || event == NETDEV_DOWN)) + br_ifinfo_notify(RTM_NEWLINK, NULL, p); + + return NOTIFY_DONE; +} + +static struct notifier_block br_device_notifier = { + .notifier_call = br_device_event +}; + +/* called with RTNL or RCU */ +static int br_switchdev_event(struct notifier_block *unused, + unsigned long event, void *ptr) +{ + struct net_device *dev = switchdev_notifier_info_to_dev(ptr); + struct net_bridge_port *p; + struct net_bridge *br; + struct switchdev_notifier_fdb_info *fdb_info; + int err = NOTIFY_DONE; + + p = br_port_get_rtnl_rcu(dev); + if (!p) + goto out; + + br = p->br; + + switch (event) { + case SWITCHDEV_FDB_ADD_TO_BRIDGE: + fdb_info = ptr; + err = br_fdb_external_learn_add(br, p, fdb_info->addr, + fdb_info->vid, + fdb_info->locked, false); + if (err) { + err = notifier_from_errno(err); + break; + } + br_fdb_offloaded_set(br, p, fdb_info->addr, + fdb_info->vid, fdb_info->offloaded); + break; + case SWITCHDEV_FDB_DEL_TO_BRIDGE: + fdb_info = ptr; + err = br_fdb_external_learn_del(br, p, fdb_info->addr, + fdb_info->vid, false); + if (err) + err = notifier_from_errno(err); + break; + case SWITCHDEV_FDB_OFFLOADED: + fdb_info = ptr; + br_fdb_offloaded_set(br, p, fdb_info->addr, + fdb_info->vid, fdb_info->offloaded); + break; + case SWITCHDEV_FDB_FLUSH_TO_BRIDGE: + fdb_info = ptr; + /* Don't delete static entries */ + br_fdb_delete_by_port(br, p, fdb_info->vid, 0); + break; + } + +out: + return err; +} + +static struct notifier_block br_switchdev_notifier = { + .notifier_call = br_switchdev_event, +}; + +/* called under rtnl_mutex */ +static int br_switchdev_blocking_event(struct notifier_block *nb, + unsigned long event, void *ptr) +{ + struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr); + struct net_device *dev = switchdev_notifier_info_to_dev(ptr); + struct switchdev_notifier_brport_info *brport_info; + const struct switchdev_brport *b; + struct net_bridge_port *p; + int err = NOTIFY_DONE; + + p = br_port_get_rtnl(dev); + if (!p) + goto out; + + switch (event) { + case SWITCHDEV_BRPORT_OFFLOADED: + brport_info = ptr; + b = &brport_info->brport; + + err = br_switchdev_port_offload(p, b->dev, b->ctx, + b->atomic_nb, b->blocking_nb, + b->tx_fwd_offload, extack); + err = notifier_from_errno(err); + break; + case SWITCHDEV_BRPORT_UNOFFLOADED: + brport_info = ptr; + b = &brport_info->brport; + + br_switchdev_port_unoffload(p, b->ctx, b->atomic_nb, + b->blocking_nb); + break; + } + +out: + return err; +} + +static struct notifier_block br_switchdev_blocking_notifier = { + .notifier_call = br_switchdev_blocking_event, +}; + +/* br_boolopt_toggle - change user-controlled boolean option + * + * @br: bridge device + * @opt: id of the option to change + * @on: new option value + * @extack: extack for error messages + * + * Changes the value of the respective boolean option to @on taking care of + * any internal option value mapping and configuration. + */ +int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on, + struct netlink_ext_ack *extack) +{ + int err = 0; + + switch (opt) { + case BR_BOOLOPT_NO_LL_LEARN: + br_opt_toggle(br, BROPT_NO_LL_LEARN, on); + break; + case BR_BOOLOPT_MCAST_VLAN_SNOOPING: + err = br_multicast_toggle_vlan_snooping(br, on, extack); + break; + case BR_BOOLOPT_MST_ENABLE: + err = br_mst_set_enabled(br, on, extack); + break; + default: + /* shouldn't be called with unsupported options */ + WARN_ON(1); + break; + } + + return err; +} + +int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt) +{ + switch (opt) { + case BR_BOOLOPT_NO_LL_LEARN: + return br_opt_get(br, BROPT_NO_LL_LEARN); + case BR_BOOLOPT_MCAST_VLAN_SNOOPING: + return br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED); + case BR_BOOLOPT_MST_ENABLE: + return br_opt_get(br, BROPT_MST_ENABLED); + default: + /* shouldn't be called with unsupported options */ + WARN_ON(1); + break; + } + + return 0; +} + +int br_boolopt_multi_toggle(struct net_bridge *br, + struct br_boolopt_multi *bm, + struct netlink_ext_ack *extack) +{ + unsigned long bitmap = bm->optmask; + int err = 0; + int opt_id; + + for_each_set_bit(opt_id, &bitmap, BR_BOOLOPT_MAX) { + bool on = !!(bm->optval & BIT(opt_id)); + + err = br_boolopt_toggle(br, opt_id, on, extack); + if (err) { + br_debug(br, "boolopt multi-toggle error: option: %d current: %d new: %d error: %d\n", + opt_id, br_boolopt_get(br, opt_id), on, err); + break; + } + } + + return err; +} + +void br_boolopt_multi_get(const struct net_bridge *br, + struct br_boolopt_multi *bm) +{ + u32 optval = 0; + int opt_id; + + for (opt_id = 0; opt_id < BR_BOOLOPT_MAX; opt_id++) + optval |= (br_boolopt_get(br, opt_id) << opt_id); + + bm->optval = optval; + bm->optmask = GENMASK((BR_BOOLOPT_MAX - 1), 0); +} + +/* private bridge options, controlled by the kernel */ +void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on) +{ + bool cur = !!br_opt_get(br, opt); + + br_debug(br, "toggle option: %d state: %d -> %d\n", + opt, cur, on); + + if (cur == on) + return; + + if (on) + set_bit(opt, &br->options); + else + clear_bit(opt, &br->options); +} + +static void __net_exit br_net_exit_batch(struct list_head *net_list) +{ + struct net_device *dev; + struct net *net; + LIST_HEAD(list); + + rtnl_lock(); + + list_for_each_entry(net, net_list, exit_list) + for_each_netdev(net, dev) + if (netif_is_bridge_master(dev)) + br_dev_delete(dev, &list); + + unregister_netdevice_many(&list); + + rtnl_unlock(); +} + +static struct pernet_operations br_net_ops = { + .exit_batch = br_net_exit_batch, +}; + +static const struct stp_proto br_stp_proto = { + .rcv = br_stp_rcv, +}; + +static int __init br_init(void) +{ + int err; + + BUILD_BUG_ON(sizeof(struct br_input_skb_cb) > sizeof_field(struct sk_buff, cb)); + + err = stp_proto_register(&br_stp_proto); + if (err < 0) { + pr_err("bridge: can't register sap for STP\n"); + return err; + } + + err = br_fdb_init(); + if (err) + goto err_out; + + err = register_pernet_subsys(&br_net_ops); + if (err) + goto err_out1; + + err = br_nf_core_init(); + if (err) + goto err_out2; + + err = register_netdevice_notifier(&br_device_notifier); + if (err) + goto err_out3; + + err = register_switchdev_notifier(&br_switchdev_notifier); + if (err) + goto err_out4; + + err = register_switchdev_blocking_notifier(&br_switchdev_blocking_notifier); + if (err) + goto err_out5; + + err = br_netlink_init(); + if (err) + goto err_out6; + + brioctl_set(br_ioctl_stub); + +#if IS_ENABLED(CONFIG_ATM_LANE) + br_fdb_test_addr_hook = br_fdb_test_addr; +#endif + +#if IS_MODULE(CONFIG_BRIDGE_NETFILTER) + pr_info("bridge: filtering via arp/ip/ip6tables is no longer available " + "by default. Update your scripts to load br_netfilter if you " + "need this.\n"); +#endif + + return 0; + +err_out6: + unregister_switchdev_blocking_notifier(&br_switchdev_blocking_notifier); +err_out5: + unregister_switchdev_notifier(&br_switchdev_notifier); +err_out4: + unregister_netdevice_notifier(&br_device_notifier); +err_out3: + br_nf_core_fini(); +err_out2: + unregister_pernet_subsys(&br_net_ops); +err_out1: + br_fdb_fini(); +err_out: + stp_proto_unregister(&br_stp_proto); + return err; +} + +static void __exit br_deinit(void) +{ + stp_proto_unregister(&br_stp_proto); + br_netlink_fini(); + unregister_switchdev_blocking_notifier(&br_switchdev_blocking_notifier); + unregister_switchdev_notifier(&br_switchdev_notifier); + unregister_netdevice_notifier(&br_device_notifier); + brioctl_set(NULL); + unregister_pernet_subsys(&br_net_ops); + + rcu_barrier(); /* Wait for completion of call_rcu()'s */ + + br_nf_core_fini(); +#if IS_ENABLED(CONFIG_ATM_LANE) + br_fdb_test_addr_hook = NULL; +#endif + br_fdb_fini(); +} + +module_init(br_init) +module_exit(br_deinit) +MODULE_LICENSE("GPL"); +MODULE_VERSION(BR_VERSION); +MODULE_ALIAS_RTNL_LINK("bridge"); -- cgit v1.2.3