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/batman-adv/main.c | 731 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 731 insertions(+) create mode 100644 net/batman-adv/main.c (limited to 'net/batman-adv/main.c') diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c new file mode 100644 index 000000000..e8a449915 --- /dev/null +++ b/net/batman-adv/main.c @@ -0,0 +1,731 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + */ + +#include "main.h" + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "bat_algo.h" +#include "bat_iv_ogm.h" +#include "bat_v.h" +#include "bridge_loop_avoidance.h" +#include "distributed-arp-table.h" +#include "gateway_client.h" +#include "gateway_common.h" +#include "hard-interface.h" +#include "log.h" +#include "multicast.h" +#include "netlink.h" +#include "network-coding.h" +#include "originator.h" +#include "routing.h" +#include "send.h" +#include "soft-interface.h" +#include "tp_meter.h" +#include "translation-table.h" + +/* List manipulations on hardif_list have to be rtnl_lock()'ed, + * list traversals just rcu-locked + */ +struct list_head batadv_hardif_list; +unsigned int batadv_hardif_generation; +static int (*batadv_rx_handler[256])(struct sk_buff *skb, + struct batadv_hard_iface *recv_if); + +unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; + +struct workqueue_struct *batadv_event_workqueue; + +static void batadv_recv_handler_init(void); + +#define BATADV_UEV_TYPE_VAR "BATTYPE=" +#define BATADV_UEV_ACTION_VAR "BATACTION=" +#define BATADV_UEV_DATA_VAR "BATDATA=" + +static char *batadv_uev_action_str[] = { + "add", + "del", + "change", + "loopdetect", +}; + +static char *batadv_uev_type_str[] = { + "gw", + "bla", +}; + +static int __init batadv_init(void) +{ + int ret; + + ret = batadv_tt_cache_init(); + if (ret < 0) + return ret; + + INIT_LIST_HEAD(&batadv_hardif_list); + batadv_algo_init(); + + batadv_recv_handler_init(); + + batadv_v_init(); + batadv_iv_init(); + batadv_nc_init(); + batadv_tp_meter_init(); + + batadv_event_workqueue = create_singlethread_workqueue("bat_events"); + if (!batadv_event_workqueue) + goto err_create_wq; + + register_netdevice_notifier(&batadv_hard_if_notifier); + rtnl_link_register(&batadv_link_ops); + batadv_netlink_register(); + + pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n", + BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION); + + return 0; + +err_create_wq: + batadv_tt_cache_destroy(); + + return -ENOMEM; +} + +static void __exit batadv_exit(void) +{ + batadv_netlink_unregister(); + rtnl_link_unregister(&batadv_link_ops); + unregister_netdevice_notifier(&batadv_hard_if_notifier); + + destroy_workqueue(batadv_event_workqueue); + batadv_event_workqueue = NULL; + + rcu_barrier(); + + batadv_tt_cache_destroy(); +} + +/** + * batadv_mesh_init() - Initialize soft interface + * @soft_iface: netdev struct of the soft interface + * + * Return: 0 on success or negative error number in case of failure + */ +int batadv_mesh_init(struct net_device *soft_iface) +{ + struct batadv_priv *bat_priv = netdev_priv(soft_iface); + int ret; + + spin_lock_init(&bat_priv->forw_bat_list_lock); + spin_lock_init(&bat_priv->forw_bcast_list_lock); + spin_lock_init(&bat_priv->tt.changes_list_lock); + spin_lock_init(&bat_priv->tt.req_list_lock); + spin_lock_init(&bat_priv->tt.roam_list_lock); + spin_lock_init(&bat_priv->tt.last_changeset_lock); + spin_lock_init(&bat_priv->tt.commit_lock); + spin_lock_init(&bat_priv->gw.list_lock); +#ifdef CONFIG_BATMAN_ADV_MCAST + spin_lock_init(&bat_priv->mcast.mla_lock); + spin_lock_init(&bat_priv->mcast.want_lists_lock); +#endif + spin_lock_init(&bat_priv->tvlv.container_list_lock); + spin_lock_init(&bat_priv->tvlv.handler_list_lock); + spin_lock_init(&bat_priv->softif_vlan_list_lock); + spin_lock_init(&bat_priv->tp_list_lock); + + INIT_HLIST_HEAD(&bat_priv->forw_bat_list); + INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); + INIT_HLIST_HEAD(&bat_priv->gw.gateway_list); +#ifdef CONFIG_BATMAN_ADV_MCAST + INIT_HLIST_HEAD(&bat_priv->mcast.want_all_unsnoopables_list); + INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv4_list); + INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv6_list); +#endif + INIT_LIST_HEAD(&bat_priv->tt.changes_list); + INIT_HLIST_HEAD(&bat_priv->tt.req_list); + INIT_LIST_HEAD(&bat_priv->tt.roam_list); +#ifdef CONFIG_BATMAN_ADV_MCAST + INIT_HLIST_HEAD(&bat_priv->mcast.mla_list); +#endif + INIT_HLIST_HEAD(&bat_priv->tvlv.container_list); + INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list); + INIT_HLIST_HEAD(&bat_priv->softif_vlan_list); + INIT_HLIST_HEAD(&bat_priv->tp_list); + + bat_priv->gw.generation = 0; + + ret = batadv_originator_init(bat_priv); + if (ret < 0) { + atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); + goto err_orig; + } + + ret = batadv_tt_init(bat_priv); + if (ret < 0) { + atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); + goto err_tt; + } + + ret = batadv_v_mesh_init(bat_priv); + if (ret < 0) { + atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); + goto err_v; + } + + ret = batadv_bla_init(bat_priv); + if (ret < 0) { + atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); + goto err_bla; + } + + ret = batadv_dat_init(bat_priv); + if (ret < 0) { + atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); + goto err_dat; + } + + ret = batadv_nc_mesh_init(bat_priv); + if (ret < 0) { + atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); + goto err_nc; + } + + batadv_gw_init(bat_priv); + batadv_mcast_init(bat_priv); + + atomic_set(&bat_priv->gw.reselect, 0); + atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE); + + return 0; + +err_nc: + batadv_dat_free(bat_priv); +err_dat: + batadv_bla_free(bat_priv); +err_bla: + batadv_v_mesh_free(bat_priv); +err_v: + batadv_tt_free(bat_priv); +err_tt: + batadv_originator_free(bat_priv); +err_orig: + batadv_purge_outstanding_packets(bat_priv, NULL); + atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); + + return ret; +} + +/** + * batadv_mesh_free() - Deinitialize soft interface + * @soft_iface: netdev struct of the soft interface + */ +void batadv_mesh_free(struct net_device *soft_iface) +{ + struct batadv_priv *bat_priv = netdev_priv(soft_iface); + + atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); + + batadv_purge_outstanding_packets(bat_priv, NULL); + + batadv_gw_node_free(bat_priv); + + batadv_v_mesh_free(bat_priv); + batadv_nc_mesh_free(bat_priv); + batadv_dat_free(bat_priv); + batadv_bla_free(bat_priv); + + batadv_mcast_free(bat_priv); + + /* Free the TT and the originator tables only after having terminated + * all the other depending components which may use these structures for + * their purposes. + */ + batadv_tt_free(bat_priv); + + /* Since the originator table clean up routine is accessing the TT + * tables as well, it has to be invoked after the TT tables have been + * freed and marked as empty. This ensures that no cleanup RCU callbacks + * accessing the TT data are scheduled for later execution. + */ + batadv_originator_free(bat_priv); + + batadv_gw_free(bat_priv); + + free_percpu(bat_priv->bat_counters); + bat_priv->bat_counters = NULL; + + atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); +} + +/** + * batadv_is_my_mac() - check if the given mac address belongs to any of the + * real interfaces in the current mesh + * @bat_priv: the bat priv with all the soft interface information + * @addr: the address to check + * + * Return: 'true' if the mac address was found, false otherwise. + */ +bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr) +{ + const struct batadv_hard_iface *hard_iface; + bool is_my_mac = false; + + rcu_read_lock(); + list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { + if (hard_iface->if_status != BATADV_IF_ACTIVE) + continue; + + if (hard_iface->soft_iface != bat_priv->soft_iface) + continue; + + if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) { + is_my_mac = true; + break; + } + } + rcu_read_unlock(); + return is_my_mac; +} + +/** + * batadv_max_header_len() - calculate maximum encapsulation overhead for a + * payload packet + * + * Return: the maximum encapsulation overhead in bytes. + */ +int batadv_max_header_len(void) +{ + int header_len = 0; + + header_len = max_t(int, header_len, + sizeof(struct batadv_unicast_packet)); + header_len = max_t(int, header_len, + sizeof(struct batadv_unicast_4addr_packet)); + header_len = max_t(int, header_len, + sizeof(struct batadv_bcast_packet)); + +#ifdef CONFIG_BATMAN_ADV_NC + header_len = max_t(int, header_len, + sizeof(struct batadv_coded_packet)); +#endif + + return header_len + ETH_HLEN; +} + +/** + * batadv_skb_set_priority() - sets skb priority according to packet content + * @skb: the packet to be sent + * @offset: offset to the packet content + * + * This function sets a value between 256 and 263 (802.1d priority), which + * can be interpreted by the cfg80211 or other drivers. + */ +void batadv_skb_set_priority(struct sk_buff *skb, int offset) +{ + struct iphdr ip_hdr_tmp, *ip_hdr; + struct ipv6hdr ip6_hdr_tmp, *ip6_hdr; + struct ethhdr ethhdr_tmp, *ethhdr; + struct vlan_ethhdr *vhdr, vhdr_tmp; + u32 prio; + + /* already set, do nothing */ + if (skb->priority >= 256 && skb->priority <= 263) + return; + + ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), ðhdr_tmp); + if (!ethhdr) + return; + + switch (ethhdr->h_proto) { + case htons(ETH_P_8021Q): + vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr), + sizeof(*vhdr), &vhdr_tmp); + if (!vhdr) + return; + prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK; + prio = prio >> VLAN_PRIO_SHIFT; + break; + case htons(ETH_P_IP): + ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), + sizeof(*ip_hdr), &ip_hdr_tmp); + if (!ip_hdr) + return; + prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5; + break; + case htons(ETH_P_IPV6): + ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), + sizeof(*ip6_hdr), &ip6_hdr_tmp); + if (!ip6_hdr) + return; + prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5; + break; + default: + return; + } + + skb->priority = prio + 256; +} + +static int batadv_recv_unhandled_packet(struct sk_buff *skb, + struct batadv_hard_iface *recv_if) +{ + kfree_skb(skb); + + return NET_RX_DROP; +} + +/* incoming packets with the batman ethertype received on any active hard + * interface + */ + +/** + * batadv_batman_skb_recv() - Handle incoming message from an hard interface + * @skb: the received packet + * @dev: the net device that the packet was received on + * @ptype: packet type of incoming packet (ETH_P_BATMAN) + * @orig_dev: the original receive net device (e.g. bonded device) + * + * Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure + */ +int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, + struct packet_type *ptype, + struct net_device *orig_dev) +{ + struct batadv_priv *bat_priv; + struct batadv_ogm_packet *batadv_ogm_packet; + struct batadv_hard_iface *hard_iface; + u8 idx; + + hard_iface = container_of(ptype, struct batadv_hard_iface, + batman_adv_ptype); + + /* Prevent processing a packet received on an interface which is getting + * shut down otherwise the packet may trigger de-reference errors + * further down in the receive path. + */ + if (!kref_get_unless_zero(&hard_iface->refcount)) + goto err_out; + + skb = skb_share_check(skb, GFP_ATOMIC); + + /* skb was released by skb_share_check() */ + if (!skb) + goto err_put; + + /* packet should hold at least type and version */ + if (unlikely(!pskb_may_pull(skb, 2))) + goto err_free; + + /* expect a valid ethernet header here. */ + if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb))) + goto err_free; + + if (!hard_iface->soft_iface) + goto err_free; + + bat_priv = netdev_priv(hard_iface->soft_iface); + + if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) + goto err_free; + + /* discard frames on not active interfaces */ + if (hard_iface->if_status != BATADV_IF_ACTIVE) + goto err_free; + + batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data; + + if (batadv_ogm_packet->version != BATADV_COMPAT_VERSION) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Drop packet: incompatible batman version (%i)\n", + batadv_ogm_packet->version); + goto err_free; + } + + /* reset control block to avoid left overs from previous users */ + memset(skb->cb, 0, sizeof(struct batadv_skb_cb)); + + idx = batadv_ogm_packet->packet_type; + (*batadv_rx_handler[idx])(skb, hard_iface); + + batadv_hardif_put(hard_iface); + + /* return NET_RX_SUCCESS in any case as we + * most probably dropped the packet for + * routing-logical reasons. + */ + return NET_RX_SUCCESS; + +err_free: + kfree_skb(skb); +err_put: + batadv_hardif_put(hard_iface); +err_out: + return NET_RX_DROP; +} + +static void batadv_recv_handler_init(void) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) + batadv_rx_handler[i] = batadv_recv_unhandled_packet; + + for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++) + batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet; + + /* compile time checks for sizes */ + BUILD_BUG_ON(sizeof(struct batadv_bla_claim_dst) != 6); + BUILD_BUG_ON(sizeof(struct batadv_ogm_packet) != 24); + BUILD_BUG_ON(sizeof(struct batadv_icmp_header) != 20); + BUILD_BUG_ON(sizeof(struct batadv_icmp_packet) != 20); + BUILD_BUG_ON(sizeof(struct batadv_icmp_packet_rr) != 116); + BUILD_BUG_ON(sizeof(struct batadv_unicast_packet) != 10); + BUILD_BUG_ON(sizeof(struct batadv_unicast_4addr_packet) != 18); + BUILD_BUG_ON(sizeof(struct batadv_frag_packet) != 20); + BUILD_BUG_ON(sizeof(struct batadv_bcast_packet) != 14); + BUILD_BUG_ON(sizeof(struct batadv_coded_packet) != 46); + BUILD_BUG_ON(sizeof(struct batadv_unicast_tvlv_packet) != 20); + BUILD_BUG_ON(sizeof(struct batadv_tvlv_hdr) != 4); + BUILD_BUG_ON(sizeof(struct batadv_tvlv_gateway_data) != 8); + BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_vlan_data) != 8); + BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change) != 12); + BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv) != 8); + + i = sizeof_field(struct sk_buff, cb); + BUILD_BUG_ON(sizeof(struct batadv_skb_cb) > i); + + /* broadcast packet */ + batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; + + /* unicast packets ... */ + /* unicast with 4 addresses packet */ + batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet; + /* unicast packet */ + batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; + /* unicast tvlv packet */ + batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv; + /* batman icmp packet */ + batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; + /* Fragmented packets */ + batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet; +} + +/** + * batadv_recv_handler_register() - Register handler for batman-adv packet type + * @packet_type: batadv_packettype which should be handled + * @recv_handler: receive handler for the packet type + * + * Return: 0 on success or negative error number in case of failure + */ +int +batadv_recv_handler_register(u8 packet_type, + int (*recv_handler)(struct sk_buff *, + struct batadv_hard_iface *)) +{ + int (*curr)(struct sk_buff *skb, + struct batadv_hard_iface *recv_if); + curr = batadv_rx_handler[packet_type]; + + if (curr != batadv_recv_unhandled_packet && + curr != batadv_recv_unhandled_unicast_packet) + return -EBUSY; + + batadv_rx_handler[packet_type] = recv_handler; + return 0; +} + +/** + * batadv_recv_handler_unregister() - Unregister handler for packet type + * @packet_type: batadv_packettype which should no longer be handled + */ +void batadv_recv_handler_unregister(u8 packet_type) +{ + batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet; +} + +/** + * batadv_skb_crc32() - calculate CRC32 of the whole packet and skip bytes in + * the header + * @skb: skb pointing to fragmented socket buffers + * @payload_ptr: Pointer to position inside the head buffer of the skb + * marking the start of the data to be CRC'ed + * + * payload_ptr must always point to an address in the skb head buffer and not to + * a fragment. + * + * Return: big endian crc32c of the checksummed data + */ +__be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr) +{ + u32 crc = 0; + unsigned int from; + unsigned int to = skb->len; + struct skb_seq_state st; + const u8 *data; + unsigned int len; + unsigned int consumed = 0; + + from = (unsigned int)(payload_ptr - skb->data); + + skb_prepare_seq_read(skb, from, to, &st); + while ((len = skb_seq_read(consumed, &data, &st)) != 0) { + crc = crc32c(crc, data, len); + consumed += len; + } + + return htonl(crc); +} + +/** + * batadv_get_vid() - extract the VLAN identifier from skb if any + * @skb: the buffer containing the packet + * @header_len: length of the batman header preceding the ethernet header + * + * Return: VID with the BATADV_VLAN_HAS_TAG flag when the packet embedded in the + * skb is vlan tagged. Otherwise BATADV_NO_FLAGS. + */ +unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len) +{ + struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len); + struct vlan_ethhdr *vhdr; + unsigned short vid; + + if (ethhdr->h_proto != htons(ETH_P_8021Q)) + return BATADV_NO_FLAGS; + + if (!pskb_may_pull(skb, header_len + VLAN_ETH_HLEN)) + return BATADV_NO_FLAGS; + + vhdr = (struct vlan_ethhdr *)(skb->data + header_len); + vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; + vid |= BATADV_VLAN_HAS_TAG; + + return vid; +} + +/** + * batadv_vlan_ap_isola_get() - return AP isolation status for the given vlan + * @bat_priv: the bat priv with all the soft interface information + * @vid: the VLAN identifier for which the AP isolation attributed as to be + * looked up + * + * Return: true if AP isolation is on for the VLAN identified by vid, false + * otherwise + */ +bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid) +{ + bool ap_isolation_enabled = false; + struct batadv_softif_vlan *vlan; + + /* if the AP isolation is requested on a VLAN, then check for its + * setting in the proper VLAN private data structure + */ + vlan = batadv_softif_vlan_get(bat_priv, vid); + if (vlan) { + ap_isolation_enabled = atomic_read(&vlan->ap_isolation); + batadv_softif_vlan_put(vlan); + } + + return ap_isolation_enabled; +} + +/** + * batadv_throw_uevent() - Send an uevent with batman-adv specific env data + * @bat_priv: the bat priv with all the soft interface information + * @type: subsystem type of event. Stored in uevent's BATTYPE + * @action: action type of event. Stored in uevent's BATACTION + * @data: string with additional information to the event (ignored for + * BATADV_UEV_DEL). Stored in uevent's BATDATA + * + * Return: 0 on success or negative error number in case of failure + */ +int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type, + enum batadv_uev_action action, const char *data) +{ + int ret = -ENOMEM; + struct kobject *bat_kobj; + char *uevent_env[4] = { NULL, NULL, NULL, NULL }; + + bat_kobj = &bat_priv->soft_iface->dev.kobj; + + uevent_env[0] = kasprintf(GFP_ATOMIC, + "%s%s", BATADV_UEV_TYPE_VAR, + batadv_uev_type_str[type]); + if (!uevent_env[0]) + goto out; + + uevent_env[1] = kasprintf(GFP_ATOMIC, + "%s%s", BATADV_UEV_ACTION_VAR, + batadv_uev_action_str[action]); + if (!uevent_env[1]) + goto out; + + /* If the event is DEL, ignore the data field */ + if (action != BATADV_UEV_DEL) { + uevent_env[2] = kasprintf(GFP_ATOMIC, + "%s%s", BATADV_UEV_DATA_VAR, data); + if (!uevent_env[2]) + goto out; + } + + ret = kobject_uevent_env(bat_kobj, KOBJ_CHANGE, uevent_env); +out: + kfree(uevent_env[0]); + kfree(uevent_env[1]); + kfree(uevent_env[2]); + + if (ret) + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Impossible to send uevent for (%s,%s,%s) event (err: %d)\n", + batadv_uev_type_str[type], + batadv_uev_action_str[action], + (action == BATADV_UEV_DEL ? "NULL" : data), ret); + return ret; +} + +module_init(batadv_init); +module_exit(batadv_exit); + +MODULE_LICENSE("GPL"); + +MODULE_AUTHOR(BATADV_DRIVER_AUTHOR); +MODULE_DESCRIPTION(BATADV_DRIVER_DESC); +MODULE_VERSION(BATADV_SOURCE_VERSION); +MODULE_ALIAS_RTNL_LINK("batadv"); +MODULE_ALIAS_GENL_FAMILY(BATADV_NL_NAME); -- cgit v1.2.3