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_forward.c | 343 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 343 insertions(+) create mode 100644 net/bridge/br_forward.c (limited to 'net/bridge/br_forward.c') diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c new file mode 100644 index 000000000..02bb620d3 --- /dev/null +++ b/net/bridge/br_forward.c @@ -0,0 +1,343 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Forwarding decision + * Linux ethernet bridge + * + * Authors: + * Lennert Buytenhek + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include "br_private.h" + +/* Don't forward packets to originating port or forwarding disabled */ +static inline int should_deliver(const struct net_bridge_port *p, + const struct sk_buff *skb) +{ + struct net_bridge_vlan_group *vg; + + vg = nbp_vlan_group_rcu(p); + return ((p->flags & BR_HAIRPIN_MODE) || skb->dev != p->dev) && + p->state == BR_STATE_FORWARDING && br_allowed_egress(vg, skb) && + nbp_switchdev_allowed_egress(p, skb) && + !br_skb_isolated(p, skb); +} + +int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb) +{ + skb_push(skb, ETH_HLEN); + if (!is_skb_forwardable(skb->dev, skb)) + goto drop; + + br_drop_fake_rtable(skb); + + if (skb->ip_summed == CHECKSUM_PARTIAL && + eth_type_vlan(skb->protocol)) { + int depth; + + if (!__vlan_get_protocol(skb, skb->protocol, &depth)) + goto drop; + + skb_set_network_header(skb, depth); + } + + br_switchdev_frame_set_offload_fwd_mark(skb); + + dev_queue_xmit(skb); + + return 0; + +drop: + kfree_skb(skb); + return 0; +} +EXPORT_SYMBOL_GPL(br_dev_queue_push_xmit); + +int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb) +{ + skb_clear_tstamp(skb); + return NF_HOOK(NFPROTO_BRIDGE, NF_BR_POST_ROUTING, + net, sk, skb, NULL, skb->dev, + br_dev_queue_push_xmit); + +} +EXPORT_SYMBOL_GPL(br_forward_finish); + +static void __br_forward(const struct net_bridge_port *to, + struct sk_buff *skb, bool local_orig) +{ + struct net_bridge_vlan_group *vg; + struct net_device *indev; + struct net *net; + int br_hook; + + /* Mark the skb for forwarding offload early so that br_handle_vlan() + * can know whether to pop the VLAN header on egress or keep it. + */ + nbp_switchdev_frame_mark_tx_fwd_offload(to, skb); + + vg = nbp_vlan_group_rcu(to); + skb = br_handle_vlan(to->br, to, vg, skb); + if (!skb) + return; + + indev = skb->dev; + skb->dev = to->dev; + if (!local_orig) { + if (skb_warn_if_lro(skb)) { + kfree_skb(skb); + return; + } + br_hook = NF_BR_FORWARD; + skb_forward_csum(skb); + net = dev_net(indev); + } else { + if (unlikely(netpoll_tx_running(to->br->dev))) { + skb_push(skb, ETH_HLEN); + if (!is_skb_forwardable(skb->dev, skb)) + kfree_skb(skb); + else + br_netpoll_send_skb(to, skb); + return; + } + br_hook = NF_BR_LOCAL_OUT; + net = dev_net(skb->dev); + indev = NULL; + } + + NF_HOOK(NFPROTO_BRIDGE, br_hook, + net, NULL, skb, indev, skb->dev, + br_forward_finish); +} + +static int deliver_clone(const struct net_bridge_port *prev, + struct sk_buff *skb, bool local_orig) +{ + struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev; + + skb = skb_clone(skb, GFP_ATOMIC); + if (!skb) { + dev->stats.tx_dropped++; + return -ENOMEM; + } + + __br_forward(prev, skb, local_orig); + return 0; +} + +/** + * br_forward - forward a packet to a specific port + * @to: destination port + * @skb: packet being forwarded + * @local_rcv: packet will be received locally after forwarding + * @local_orig: packet is locally originated + * + * Should be called with rcu_read_lock. + */ +void br_forward(const struct net_bridge_port *to, + struct sk_buff *skb, bool local_rcv, bool local_orig) +{ + if (unlikely(!to)) + goto out; + + /* redirect to backup link if the destination port is down */ + if (rcu_access_pointer(to->backup_port) && !netif_carrier_ok(to->dev)) { + struct net_bridge_port *backup_port; + + backup_port = rcu_dereference(to->backup_port); + if (unlikely(!backup_port)) + goto out; + to = backup_port; + } + + if (should_deliver(to, skb)) { + if (local_rcv) + deliver_clone(to, skb, local_orig); + else + __br_forward(to, skb, local_orig); + return; + } + +out: + if (!local_rcv) + kfree_skb(skb); +} +EXPORT_SYMBOL_GPL(br_forward); + +static struct net_bridge_port *maybe_deliver( + struct net_bridge_port *prev, struct net_bridge_port *p, + struct sk_buff *skb, bool local_orig) +{ + u8 igmp_type = br_multicast_igmp_type(skb); + int err; + + if (!should_deliver(p, skb)) + return prev; + + nbp_switchdev_frame_mark_tx_fwd_to_hwdom(p, skb); + + if (!prev) + goto out; + + err = deliver_clone(prev, skb, local_orig); + if (err) + return ERR_PTR(err); +out: + br_multicast_count(p->br, p, skb, igmp_type, BR_MCAST_DIR_TX); + + return p; +} + +/* called under rcu_read_lock */ +void br_flood(struct net_bridge *br, struct sk_buff *skb, + enum br_pkt_type pkt_type, bool local_rcv, bool local_orig) +{ + struct net_bridge_port *prev = NULL; + struct net_bridge_port *p; + + list_for_each_entry_rcu(p, &br->port_list, list) { + /* Do not flood unicast traffic to ports that turn it off, nor + * other traffic if flood off, except for traffic we originate + */ + switch (pkt_type) { + case BR_PKT_UNICAST: + if (!(p->flags & BR_FLOOD)) + continue; + break; + case BR_PKT_MULTICAST: + if (!(p->flags & BR_MCAST_FLOOD) && skb->dev != br->dev) + continue; + break; + case BR_PKT_BROADCAST: + if (!(p->flags & BR_BCAST_FLOOD) && skb->dev != br->dev) + continue; + break; + } + + /* Do not flood to ports that enable proxy ARP */ + if (p->flags & BR_PROXYARP) + continue; + if ((p->flags & (BR_PROXYARP_WIFI | BR_NEIGH_SUPPRESS)) && + BR_INPUT_SKB_CB(skb)->proxyarp_replied) + continue; + + prev = maybe_deliver(prev, p, skb, local_orig); + if (IS_ERR(prev)) + goto out; + } + + if (!prev) + goto out; + + if (local_rcv) + deliver_clone(prev, skb, local_orig); + else + __br_forward(prev, skb, local_orig); + return; + +out: + if (!local_rcv) + kfree_skb(skb); +} + +#ifdef CONFIG_BRIDGE_IGMP_SNOOPING +static void maybe_deliver_addr(struct net_bridge_port *p, struct sk_buff *skb, + const unsigned char *addr, bool local_orig) +{ + struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev; + const unsigned char *src = eth_hdr(skb)->h_source; + + if (!should_deliver(p, skb)) + return; + + /* Even with hairpin, no soliloquies - prevent breaking IPv6 DAD */ + if (skb->dev == p->dev && ether_addr_equal(src, addr)) + return; + + skb = skb_copy(skb, GFP_ATOMIC); + if (!skb) { + dev->stats.tx_dropped++; + return; + } + + if (!is_broadcast_ether_addr(addr)) + memcpy(eth_hdr(skb)->h_dest, addr, ETH_ALEN); + + __br_forward(p, skb, local_orig); +} + +/* called with rcu_read_lock */ +void br_multicast_flood(struct net_bridge_mdb_entry *mdst, + struct sk_buff *skb, + struct net_bridge_mcast *brmctx, + bool local_rcv, bool local_orig) +{ + struct net_bridge_port *prev = NULL; + struct net_bridge_port_group *p; + bool allow_mode_include = true; + struct hlist_node *rp; + + rp = br_multicast_get_first_rport_node(brmctx, skb); + + if (mdst) { + p = rcu_dereference(mdst->ports); + if (br_multicast_should_handle_mode(brmctx, mdst->addr.proto) && + br_multicast_is_star_g(&mdst->addr)) + allow_mode_include = false; + } else { + p = NULL; + } + + while (p || rp) { + struct net_bridge_port *port, *lport, *rport; + + lport = p ? p->key.port : NULL; + rport = br_multicast_rport_from_node_skb(rp, skb); + + if ((unsigned long)lport > (unsigned long)rport) { + port = lport; + + if (port->flags & BR_MULTICAST_TO_UNICAST) { + maybe_deliver_addr(lport, skb, p->eth_addr, + local_orig); + goto delivered; + } + if ((!allow_mode_include && + p->filter_mode == MCAST_INCLUDE) || + (p->flags & MDB_PG_FLAGS_BLOCKED)) + goto delivered; + } else { + port = rport; + } + + prev = maybe_deliver(prev, port, skb, local_orig); + if (IS_ERR(prev)) + goto out; +delivered: + if ((unsigned long)lport >= (unsigned long)port) + p = rcu_dereference(p->next); + if ((unsigned long)rport >= (unsigned long)port) + rp = rcu_dereference(hlist_next_rcu(rp)); + } + + if (!prev) + goto out; + + if (local_rcv) + deliver_clone(prev, skb, local_orig); + else + __br_forward(prev, skb, local_orig); + return; + +out: + if (!local_rcv) + kfree_skb(skb); +} +#endif -- cgit v1.2.3