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/llc/llc_sap.c | 439 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 439 insertions(+) create mode 100644 net/llc/llc_sap.c (limited to 'net/llc/llc_sap.c') diff --git a/net/llc/llc_sap.c b/net/llc/llc_sap.c new file mode 100644 index 000000000..6805ce43a --- /dev/null +++ b/net/llc/llc_sap.c @@ -0,0 +1,439 @@ +/* + * llc_sap.c - driver routines for SAP component. + * + * Copyright (c) 1997 by Procom Technology, Inc. + * 2001-2003 by Arnaldo Carvalho de Melo + * + * This program can be redistributed or modified under the terms of the + * GNU General Public License as published by the Free Software Foundation. + * This program is distributed without any warranty or implied warranty + * of merchantability or fitness for a particular purpose. + * + * See the GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static int llc_mac_header_len(unsigned short devtype) +{ + switch (devtype) { + case ARPHRD_ETHER: + case ARPHRD_LOOPBACK: + return sizeof(struct ethhdr); + } + return 0; +} + +/** + * llc_alloc_frame - allocates sk_buff for frame + * @sk: socket to allocate frame to + * @dev: network device this skb will be sent over + * @type: pdu type to allocate + * @data_size: data size to allocate + * + * Allocates an sk_buff for frame and initializes sk_buff fields. + * Returns allocated skb or %NULL when out of memory. + */ +struct sk_buff *llc_alloc_frame(struct sock *sk, struct net_device *dev, + u8 type, u32 data_size) +{ + int hlen = type == LLC_PDU_TYPE_U ? 3 : 4; + struct sk_buff *skb; + + hlen += llc_mac_header_len(dev->type); + skb = alloc_skb(hlen + data_size, GFP_ATOMIC); + + if (skb) { + skb_reset_mac_header(skb); + skb_reserve(skb, hlen); + skb_reset_network_header(skb); + skb_reset_transport_header(skb); + skb->protocol = htons(ETH_P_802_2); + skb->dev = dev; + if (sk != NULL) + skb_set_owner_w(skb, sk); + } + return skb; +} + +void llc_save_primitive(struct sock *sk, struct sk_buff *skb, u8 prim) +{ + struct sockaddr_llc *addr; + + /* save primitive for use by the user. */ + addr = llc_ui_skb_cb(skb); + + memset(addr, 0, sizeof(*addr)); + addr->sllc_family = sk->sk_family; + addr->sllc_arphrd = skb->dev->type; + addr->sllc_test = prim == LLC_TEST_PRIM; + addr->sllc_xid = prim == LLC_XID_PRIM; + addr->sllc_ua = prim == LLC_DATAUNIT_PRIM; + llc_pdu_decode_sa(skb, addr->sllc_mac); + llc_pdu_decode_ssap(skb, &addr->sllc_sap); +} + +/** + * llc_sap_rtn_pdu - Informs upper layer on rx of an UI, XID or TEST pdu. + * @sap: pointer to SAP + * @skb: received pdu + */ +void llc_sap_rtn_pdu(struct llc_sap *sap, struct sk_buff *skb) +{ + struct llc_sap_state_ev *ev = llc_sap_ev(skb); + struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); + + switch (LLC_U_PDU_RSP(pdu)) { + case LLC_1_PDU_CMD_TEST: + ev->prim = LLC_TEST_PRIM; break; + case LLC_1_PDU_CMD_XID: + ev->prim = LLC_XID_PRIM; break; + case LLC_1_PDU_CMD_UI: + ev->prim = LLC_DATAUNIT_PRIM; break; + } + ev->ind_cfm_flag = LLC_IND; +} + +/** + * llc_find_sap_trans - finds transition for event + * @sap: pointer to SAP + * @skb: happened event + * + * This function finds transition that matches with happened event. + * Returns the pointer to found transition on success or %NULL for + * failure. + */ +static struct llc_sap_state_trans *llc_find_sap_trans(struct llc_sap *sap, + struct sk_buff *skb) +{ + int i = 0; + struct llc_sap_state_trans *rc = NULL; + struct llc_sap_state_trans **next_trans; + struct llc_sap_state *curr_state = &llc_sap_state_table[sap->state - 1]; + /* + * Search thru events for this state until list exhausted or until + * its obvious the event is not valid for the current state + */ + for (next_trans = curr_state->transitions; next_trans[i]->ev; i++) + if (!next_trans[i]->ev(sap, skb)) { + rc = next_trans[i]; /* got event match; return it */ + break; + } + return rc; +} + +/** + * llc_exec_sap_trans_actions - execute actions related to event + * @sap: pointer to SAP + * @trans: pointer to transition that it's actions must be performed + * @skb: happened event. + * + * This function executes actions that is related to happened event. + * Returns 0 for success and 1 for failure of at least one action. + */ +static int llc_exec_sap_trans_actions(struct llc_sap *sap, + struct llc_sap_state_trans *trans, + struct sk_buff *skb) +{ + int rc = 0; + const llc_sap_action_t *next_action = trans->ev_actions; + + for (; next_action && *next_action; next_action++) + if ((*next_action)(sap, skb)) + rc = 1; + return rc; +} + +/** + * llc_sap_next_state - finds transition, execs actions & change SAP state + * @sap: pointer to SAP + * @skb: happened event + * + * This function finds transition that matches with happened event, then + * executes related actions and finally changes state of SAP. It returns + * 0 on success and 1 for failure. + */ +static int llc_sap_next_state(struct llc_sap *sap, struct sk_buff *skb) +{ + int rc = 1; + struct llc_sap_state_trans *trans; + + if (sap->state > LLC_NR_SAP_STATES) + goto out; + trans = llc_find_sap_trans(sap, skb); + if (!trans) + goto out; + /* + * Got the state to which we next transition; perform the actions + * associated with this transition before actually transitioning to the + * next state + */ + rc = llc_exec_sap_trans_actions(sap, trans, skb); + if (rc) + goto out; + /* + * Transition SAP to next state if all actions execute successfully + */ + sap->state = trans->next_state; +out: + return rc; +} + +/** + * llc_sap_state_process - sends event to SAP state machine + * @sap: sap to use + * @skb: pointer to occurred event + * + * After executing actions of the event, upper layer will be indicated + * if needed(on receiving an UI frame). sk can be null for the + * datalink_proto case. + * + * This function always consumes a reference to the skb. + */ +static void llc_sap_state_process(struct llc_sap *sap, struct sk_buff *skb) +{ + struct llc_sap_state_ev *ev = llc_sap_ev(skb); + + ev->ind_cfm_flag = 0; + llc_sap_next_state(sap, skb); + + if (ev->ind_cfm_flag == LLC_IND && skb->sk->sk_state != TCP_LISTEN) { + llc_save_primitive(skb->sk, skb, ev->prim); + + /* queue skb to the user. */ + if (sock_queue_rcv_skb(skb->sk, skb) == 0) + return; + } + kfree_skb(skb); +} + +/** + * llc_build_and_send_test_pkt - TEST interface for upper layers. + * @sap: sap to use + * @skb: packet to send + * @dmac: destination mac address + * @dsap: destination sap + * + * This function is called when upper layer wants to send a TEST pdu. + * Returns 0 for success, 1 otherwise. + */ +void llc_build_and_send_test_pkt(struct llc_sap *sap, + struct sk_buff *skb, u8 *dmac, u8 dsap) +{ + struct llc_sap_state_ev *ev = llc_sap_ev(skb); + + ev->saddr.lsap = sap->laddr.lsap; + ev->daddr.lsap = dsap; + memcpy(ev->saddr.mac, skb->dev->dev_addr, IFHWADDRLEN); + memcpy(ev->daddr.mac, dmac, IFHWADDRLEN); + + ev->type = LLC_SAP_EV_TYPE_PRIM; + ev->prim = LLC_TEST_PRIM; + ev->prim_type = LLC_PRIM_TYPE_REQ; + llc_sap_state_process(sap, skb); +} + +/** + * llc_build_and_send_xid_pkt - XID interface for upper layers + * @sap: sap to use + * @skb: packet to send + * @dmac: destination mac address + * @dsap: destination sap + * + * This function is called when upper layer wants to send a XID pdu. + * Returns 0 for success, 1 otherwise. + */ +void llc_build_and_send_xid_pkt(struct llc_sap *sap, struct sk_buff *skb, + u8 *dmac, u8 dsap) +{ + struct llc_sap_state_ev *ev = llc_sap_ev(skb); + + ev->saddr.lsap = sap->laddr.lsap; + ev->daddr.lsap = dsap; + memcpy(ev->saddr.mac, skb->dev->dev_addr, IFHWADDRLEN); + memcpy(ev->daddr.mac, dmac, IFHWADDRLEN); + + ev->type = LLC_SAP_EV_TYPE_PRIM; + ev->prim = LLC_XID_PRIM; + ev->prim_type = LLC_PRIM_TYPE_REQ; + llc_sap_state_process(sap, skb); +} + +/** + * llc_sap_rcv - sends received pdus to the sap state machine + * @sap: current sap component structure. + * @skb: received frame. + * @sk: socket to associate to frame + * + * Sends received pdus to the sap state machine. + */ +static void llc_sap_rcv(struct llc_sap *sap, struct sk_buff *skb, + struct sock *sk) +{ + struct llc_sap_state_ev *ev = llc_sap_ev(skb); + + ev->type = LLC_SAP_EV_TYPE_PDU; + ev->reason = 0; + skb_orphan(skb); + sock_hold(sk); + skb->sk = sk; + skb->destructor = sock_efree; + llc_sap_state_process(sap, skb); +} + +static inline bool llc_dgram_match(const struct llc_sap *sap, + const struct llc_addr *laddr, + const struct sock *sk) +{ + struct llc_sock *llc = llc_sk(sk); + + return sk->sk_type == SOCK_DGRAM && + llc->laddr.lsap == laddr->lsap && + ether_addr_equal(llc->laddr.mac, laddr->mac); +} + +/** + * llc_lookup_dgram - Finds dgram socket for the local sap/mac + * @sap: SAP + * @laddr: address of local LLC (MAC + SAP) + * + * Search socket list of the SAP and finds connection using the local + * mac, and local sap. Returns pointer for socket found, %NULL otherwise. + */ +static struct sock *llc_lookup_dgram(struct llc_sap *sap, + const struct llc_addr *laddr) +{ + struct sock *rc; + struct hlist_nulls_node *node; + int slot = llc_sk_laddr_hashfn(sap, laddr); + struct hlist_nulls_head *laddr_hb = &sap->sk_laddr_hash[slot]; + + rcu_read_lock_bh(); +again: + sk_nulls_for_each_rcu(rc, node, laddr_hb) { + if (llc_dgram_match(sap, laddr, rc)) { + /* Extra checks required by SLAB_TYPESAFE_BY_RCU */ + if (unlikely(!refcount_inc_not_zero(&rc->sk_refcnt))) + goto again; + if (unlikely(llc_sk(rc)->sap != sap || + !llc_dgram_match(sap, laddr, rc))) { + sock_put(rc); + continue; + } + goto found; + } + } + rc = NULL; + /* + * if the nulls value we got at the end of this lookup is + * not the expected one, we must restart lookup. + * We probably met an item that was moved to another chain. + */ + if (unlikely(get_nulls_value(node) != slot)) + goto again; +found: + rcu_read_unlock_bh(); + return rc; +} + +static inline bool llc_mcast_match(const struct llc_sap *sap, + const struct llc_addr *laddr, + const struct sk_buff *skb, + const struct sock *sk) +{ + struct llc_sock *llc = llc_sk(sk); + + return sk->sk_type == SOCK_DGRAM && + llc->laddr.lsap == laddr->lsap && + llc->dev == skb->dev; +} + +static void llc_do_mcast(struct llc_sap *sap, struct sk_buff *skb, + struct sock **stack, int count) +{ + struct sk_buff *skb1; + int i; + + for (i = 0; i < count; i++) { + skb1 = skb_clone(skb, GFP_ATOMIC); + if (!skb1) { + sock_put(stack[i]); + continue; + } + + llc_sap_rcv(sap, skb1, stack[i]); + sock_put(stack[i]); + } +} + +/** + * llc_sap_mcast - Deliver multicast PDU's to all matching datagram sockets. + * @sap: SAP + * @laddr: address of local LLC (MAC + SAP) + * @skb: PDU to deliver + * + * Search socket list of the SAP and finds connections with same sap. + * Deliver clone to each. + */ +static void llc_sap_mcast(struct llc_sap *sap, + const struct llc_addr *laddr, + struct sk_buff *skb) +{ + int i = 0; + struct sock *sk; + struct sock *stack[256 / sizeof(struct sock *)]; + struct llc_sock *llc; + struct hlist_head *dev_hb = llc_sk_dev_hash(sap, skb->dev->ifindex); + + spin_lock_bh(&sap->sk_lock); + hlist_for_each_entry(llc, dev_hb, dev_hash_node) { + + sk = &llc->sk; + + if (!llc_mcast_match(sap, laddr, skb, sk)) + continue; + + sock_hold(sk); + if (i < ARRAY_SIZE(stack)) + stack[i++] = sk; + else { + llc_do_mcast(sap, skb, stack, i); + i = 0; + } + } + spin_unlock_bh(&sap->sk_lock); + + llc_do_mcast(sap, skb, stack, i); +} + + +void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb) +{ + struct llc_addr laddr; + + llc_pdu_decode_da(skb, laddr.mac); + llc_pdu_decode_dsap(skb, &laddr.lsap); + + if (is_multicast_ether_addr(laddr.mac)) { + llc_sap_mcast(sap, &laddr, skb); + kfree_skb(skb); + } else { + struct sock *sk = llc_lookup_dgram(sap, &laddr); + if (sk) { + llc_sap_rcv(sap, skb, sk); + sock_put(sk); + } else + kfree_skb(skb); + } +} -- cgit v1.2.3