// SPDX-License-Identifier: GPL-2.0 /* Copyright (C) B.A.T.M.A.N. contributors: * * Antonio Quartulli */ #include "distributed-arp-table.h" #include "main.h" #include <asm/unaligned.h> #include <linux/atomic.h> #include <linux/bitops.h> #include <linux/byteorder/generic.h> #include <linux/container_of.h> #include <linux/errno.h> #include <linux/etherdevice.h> #include <linux/gfp.h> #include <linux/if_arp.h> #include <linux/if_ether.h> #include <linux/if_vlan.h> #include <linux/in.h> #include <linux/ip.h> #include <linux/jiffies.h> #include <linux/kref.h> #include <linux/list.h> #include <linux/netlink.h> #include <linux/rculist.h> #include <linux/rcupdate.h> #include <linux/skbuff.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/stddef.h> #include <linux/string.h> #include <linux/udp.h> #include <linux/workqueue.h> #include <net/arp.h> #include <net/genetlink.h> #include <net/netlink.h> #include <net/sock.h> #include <uapi/linux/batman_adv.h> #include "bridge_loop_avoidance.h" #include "hard-interface.h" #include "hash.h" #include "log.h" #include "netlink.h" #include "originator.h" #include "send.h" #include "soft-interface.h" #include "translation-table.h" #include "tvlv.h" enum batadv_bootpop { … }; enum batadv_boothtype { … }; enum batadv_dhcpoptioncode { … }; enum batadv_dhcptype { … }; /* { 99, 130, 83, 99 } */ #define BATADV_DHCP_MAGIC … struct batadv_dhcp_packet { … }; #define BATADV_DHCP_YIADDR_LEN … #define BATADV_DHCP_CHADDR_LEN … static void batadv_dat_purge(struct work_struct *work); /** * batadv_dat_start_timer() - initialise the DAT periodic worker * @bat_priv: the bat priv with all the soft interface information */ static void batadv_dat_start_timer(struct batadv_priv *bat_priv) { … } /** * batadv_dat_entry_release() - release dat_entry from lists and queue for free * after rcu grace period * @ref: kref pointer of the dat_entry */ static void batadv_dat_entry_release(struct kref *ref) { … } /** * batadv_dat_entry_put() - decrement the dat_entry refcounter and possibly * release it * @dat_entry: dat_entry to be free'd */ static void batadv_dat_entry_put(struct batadv_dat_entry *dat_entry) { … } /** * batadv_dat_to_purge() - check whether a dat_entry has to be purged or not * @dat_entry: the entry to check * * Return: true if the entry has to be purged now, false otherwise. */ static bool batadv_dat_to_purge(struct batadv_dat_entry *dat_entry) { … } /** * __batadv_dat_purge() - delete entries from the DAT local storage * @bat_priv: the bat priv with all the soft interface information * @to_purge: function in charge to decide whether an entry has to be purged or * not. This function takes the dat_entry as argument and has to * returns a boolean value: true is the entry has to be deleted, * false otherwise * * Loops over each entry in the DAT local storage and deletes it if and only if * the to_purge function passed as argument returns true. */ static void __batadv_dat_purge(struct batadv_priv *bat_priv, bool (*to_purge)(struct batadv_dat_entry *)) { … } /** * batadv_dat_purge() - periodic task that deletes old entries from the local * DAT hash table * @work: kernel work struct */ static void batadv_dat_purge(struct work_struct *work) { … } /** * batadv_compare_dat() - comparing function used in the local DAT hash table * @node: node in the local table * @data2: second object to compare the node to * * Return: true if the two entries are the same, false otherwise. */ static bool batadv_compare_dat(const struct hlist_node *node, const void *data2) { … } /** * batadv_arp_hw_src() - extract the hw_src field from an ARP packet * @skb: ARP packet * @hdr_size: size of the possible header before the ARP packet * * Return: the value of the hw_src field in the ARP packet. */ static u8 *batadv_arp_hw_src(struct sk_buff *skb, int hdr_size) { … } /** * batadv_arp_ip_src() - extract the ip_src field from an ARP packet * @skb: ARP packet * @hdr_size: size of the possible header before the ARP packet * * Return: the value of the ip_src field in the ARP packet. */ static __be32 batadv_arp_ip_src(struct sk_buff *skb, int hdr_size) { … } /** * batadv_arp_hw_dst() - extract the hw_dst field from an ARP packet * @skb: ARP packet * @hdr_size: size of the possible header before the ARP packet * * Return: the value of the hw_dst field in the ARP packet. */ static u8 *batadv_arp_hw_dst(struct sk_buff *skb, int hdr_size) { … } /** * batadv_arp_ip_dst() - extract the ip_dst field from an ARP packet * @skb: ARP packet * @hdr_size: size of the possible header before the ARP packet * * Return: the value of the ip_dst field in the ARP packet. */ static __be32 batadv_arp_ip_dst(struct sk_buff *skb, int hdr_size) { … } /** * batadv_hash_dat() - compute the hash value for an IP address * @data: data to hash * @size: size of the hash table * * Return: the selected index in the hash table for the given data. */ static u32 batadv_hash_dat(const void *data, u32 size) { … } /** * batadv_dat_entry_hash_find() - look for a given dat_entry in the local hash * table * @bat_priv: the bat priv with all the soft interface information * @ip: search key * @vid: VLAN identifier * * Return: the dat_entry if found, NULL otherwise. */ static struct batadv_dat_entry * batadv_dat_entry_hash_find(struct batadv_priv *bat_priv, __be32 ip, unsigned short vid) { … } /** * batadv_dat_entry_add() - add a new dat entry or update it if already exists * @bat_priv: the bat priv with all the soft interface information * @ip: ipv4 to add/edit * @mac_addr: mac address to assign to the given ipv4 * @vid: VLAN identifier */ static void batadv_dat_entry_add(struct batadv_priv *bat_priv, __be32 ip, u8 *mac_addr, unsigned short vid) { … } #ifdef CONFIG_BATMAN_ADV_DEBUG /** * batadv_dbg_arp() - print a debug message containing all the ARP packet * details * @bat_priv: the bat priv with all the soft interface information * @skb: ARP packet * @hdr_size: size of the possible header before the ARP packet * @msg: message to print together with the debugging information */ static void batadv_dbg_arp(struct batadv_priv *bat_priv, struct sk_buff *skb, int hdr_size, char *msg) { … } #else static void batadv_dbg_arp(struct batadv_priv *bat_priv, struct sk_buff *skb, int hdr_size, char *msg) { } #endif /* CONFIG_BATMAN_ADV_DEBUG */ /** * batadv_is_orig_node_eligible() - check whether a node can be a DHT candidate * @res: the array with the already selected candidates * @select: number of already selected candidates * @tmp_max: address of the currently evaluated node * @max: current round max address * @last_max: address of the last selected candidate * @candidate: orig_node under evaluation * @max_orig_node: last selected candidate * * Return: true if the node has been elected as next candidate or false * otherwise. */ static bool batadv_is_orig_node_eligible(struct batadv_dat_candidate *res, int select, batadv_dat_addr_t tmp_max, batadv_dat_addr_t max, batadv_dat_addr_t last_max, struct batadv_orig_node *candidate, struct batadv_orig_node *max_orig_node) { … } /** * batadv_choose_next_candidate() - select the next DHT candidate * @bat_priv: the bat priv with all the soft interface information * @cands: candidates array * @select: number of candidates already present in the array * @ip_key: key to look up in the DHT * @last_max: pointer where the address of the selected candidate will be saved */ static void batadv_choose_next_candidate(struct batadv_priv *bat_priv, struct batadv_dat_candidate *cands, int select, batadv_dat_addr_t ip_key, batadv_dat_addr_t *last_max) { … } /** * batadv_dat_select_candidates() - select the nodes which the DHT message has * to be sent to * @bat_priv: the bat priv with all the soft interface information * @ip_dst: ipv4 to look up in the DHT * @vid: VLAN identifier * * An originator O is selected if and only if its DHT_ID value is one of three * closest values (from the LEFT, with wrap around if needed) then the hash * value of the key. ip_dst is the key. * * Return: the candidate array of size BATADV_DAT_CANDIDATE_NUM. */ static struct batadv_dat_candidate * batadv_dat_select_candidates(struct batadv_priv *bat_priv, __be32 ip_dst, unsigned short vid) { … } /** * batadv_dat_forward_data() - copy and send payload to the selected candidates * @bat_priv: the bat priv with all the soft interface information * @skb: payload to send * @ip: the DHT key * @vid: VLAN identifier * @packet_subtype: unicast4addr packet subtype to use * * This function copies the skb with pskb_copy() and is sent as a unicast packet * to each of the selected candidates. * * Return: true if the packet is sent to at least one candidate, false * otherwise. */ static bool batadv_dat_forward_data(struct batadv_priv *bat_priv, struct sk_buff *skb, __be32 ip, unsigned short vid, int packet_subtype) { … } /** * batadv_dat_tvlv_container_update() - update the dat tvlv container after dat * setting change * @bat_priv: the bat priv with all the soft interface information */ static void batadv_dat_tvlv_container_update(struct batadv_priv *bat_priv) { … } /** * batadv_dat_status_update() - update the dat tvlv container after dat * setting change * @net_dev: the soft interface net device */ void batadv_dat_status_update(struct net_device *net_dev) { … } /** * batadv_dat_tvlv_ogm_handler_v1() - process incoming dat tvlv container * @bat_priv: the bat priv with all the soft interface information * @orig: the orig_node of the ogm * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) * @tvlv_value: tvlv buffer containing the gateway data * @tvlv_value_len: tvlv buffer length */ static void batadv_dat_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, struct batadv_orig_node *orig, u8 flags, void *tvlv_value, u16 tvlv_value_len) { … } /** * batadv_dat_hash_free() - free the local DAT hash table * @bat_priv: the bat priv with all the soft interface information */ static void batadv_dat_hash_free(struct batadv_priv *bat_priv) { … } /** * batadv_dat_init() - initialise the DAT internals * @bat_priv: the bat priv with all the soft interface information * * Return: 0 in case of success, a negative error code otherwise */ int batadv_dat_init(struct batadv_priv *bat_priv) { … } /** * batadv_dat_free() - free the DAT internals * @bat_priv: the bat priv with all the soft interface information */ void batadv_dat_free(struct batadv_priv *bat_priv) { … } /** * batadv_dat_cache_dump_entry() - dump one entry of the DAT cache table to a * netlink socket * @msg: buffer for the message * @portid: netlink port * @cb: Control block containing additional options * @dat_entry: entry to dump * * Return: 0 or error code. */ static int batadv_dat_cache_dump_entry(struct sk_buff *msg, u32 portid, struct netlink_callback *cb, struct batadv_dat_entry *dat_entry) { … } /** * batadv_dat_cache_dump_bucket() - dump one bucket of the DAT cache table to * a netlink socket * @msg: buffer for the message * @portid: netlink port * @cb: Control block containing additional options * @hash: hash to dump * @bucket: bucket index to dump * @idx_skip: How many entries to skip * * Return: 0 or error code. */ static int batadv_dat_cache_dump_bucket(struct sk_buff *msg, u32 portid, struct netlink_callback *cb, struct batadv_hashtable *hash, unsigned int bucket, int *idx_skip) { … } /** * batadv_dat_cache_dump() - dump DAT cache table to a netlink socket * @msg: buffer for the message * @cb: callback structure containing arguments * * Return: message length. */ int batadv_dat_cache_dump(struct sk_buff *msg, struct netlink_callback *cb) { … } /** * batadv_arp_get_type() - parse an ARP packet and gets the type * @bat_priv: the bat priv with all the soft interface information * @skb: packet to analyse * @hdr_size: size of the possible header before the ARP packet in the skb * * Return: the ARP type if the skb contains a valid ARP packet, 0 otherwise. */ static u16 batadv_arp_get_type(struct batadv_priv *bat_priv, struct sk_buff *skb, int hdr_size) { … } /** * batadv_dat_get_vid() - extract the VLAN identifier from skb if any * @skb: the buffer containing the packet to extract the VID from * @hdr_size: the size of the batman-adv header encapsulating the packet * * Return: If the packet embedded in the skb is vlan tagged this function * returns the VID with the BATADV_VLAN_HAS_TAG flag. Otherwise BATADV_NO_FLAGS * is returned. */ static unsigned short batadv_dat_get_vid(struct sk_buff *skb, int *hdr_size) { … } /** * batadv_dat_arp_create_reply() - create an ARP Reply * @bat_priv: the bat priv with all the soft interface information * @ip_src: ARP sender IP * @ip_dst: ARP target IP * @hw_src: Ethernet source and ARP sender MAC * @hw_dst: Ethernet destination and ARP target MAC * @vid: VLAN identifier (optional, set to zero otherwise) * * Creates an ARP Reply from the given values, optionally encapsulated in a * VLAN header. * * Return: An skb containing an ARP Reply. */ static struct sk_buff * batadv_dat_arp_create_reply(struct batadv_priv *bat_priv, __be32 ip_src, __be32 ip_dst, u8 *hw_src, u8 *hw_dst, unsigned short vid) { … } /** * batadv_dat_snoop_outgoing_arp_request() - snoop the ARP request and try to * answer using DAT * @bat_priv: the bat priv with all the soft interface information * @skb: packet to check * * Return: true if the message has been sent to the dht candidates, false * otherwise. In case of a positive return value the message has to be enqueued * to permit the fallback. */ bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv, struct sk_buff *skb) { … } /** * batadv_dat_snoop_incoming_arp_request() - snoop the ARP request and try to * answer using the local DAT storage * @bat_priv: the bat priv with all the soft interface information * @skb: packet to check * @hdr_size: size of the encapsulation header * * Return: true if the request has been answered, false otherwise. */ bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv, struct sk_buff *skb, int hdr_size) { … } /** * batadv_dat_snoop_outgoing_arp_reply() - snoop the ARP reply and fill the DHT * @bat_priv: the bat priv with all the soft interface information * @skb: packet to check */ void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv, struct sk_buff *skb) { … } /** * batadv_dat_snoop_incoming_arp_reply() - snoop the ARP reply and fill the * local DAT storage only * @bat_priv: the bat priv with all the soft interface information * @skb: packet to check * @hdr_size: size of the encapsulation header * * Return: true if the packet was snooped and consumed by DAT. False if the * packet has to be delivered to the interface */ bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv, struct sk_buff *skb, int hdr_size) { … } /** * batadv_dat_check_dhcp_ipudp() - check skb for IP+UDP headers valid for DHCP * @skb: the packet to check * @ip_src: a buffer to store the IPv4 source address in * * Checks whether the given skb has an IP and UDP header valid for a DHCP * message from a DHCP server. And if so, stores the IPv4 source address in * the provided buffer. * * Return: True if valid, false otherwise. */ static bool batadv_dat_check_dhcp_ipudp(struct sk_buff *skb, __be32 *ip_src) { … } /** * batadv_dat_check_dhcp() - examine packet for valid DHCP message * @skb: the packet to check * @proto: ethernet protocol hint (behind a potential vlan) * @ip_src: a buffer to store the IPv4 source address in * * Checks whether the given skb is a valid DHCP packet. And if so, stores the * IPv4 source address in the provided buffer. * * Caller needs to ensure that the skb network header is set correctly. * * Return: If skb is a valid DHCP packet, then returns its op code * (e.g. BOOTREPLY vs. BOOTREQUEST). Otherwise returns -EINVAL. */ static int batadv_dat_check_dhcp(struct sk_buff *skb, __be16 proto, __be32 *ip_src) { … } /** * batadv_dat_get_dhcp_message_type() - get message type of a DHCP packet * @skb: the DHCP packet to parse * * Iterates over the DHCP options of the given DHCP packet to find a * DHCP Message Type option and parse it. * * Caller needs to ensure that the given skb is a valid DHCP packet and * that the skb transport header is set correctly. * * Return: The found DHCP message type value, if found. -EINVAL otherwise. */ static int batadv_dat_get_dhcp_message_type(struct sk_buff *skb) { … } /** * batadv_dat_dhcp_get_yiaddr() - get yiaddr from a DHCP packet * @skb: the DHCP packet to parse * @buf: a buffer to store the yiaddr in * * Caller needs to ensure that the given skb is a valid DHCP packet and * that the skb transport header is set correctly. * * Return: True on success, false otherwise. */ static bool batadv_dat_dhcp_get_yiaddr(struct sk_buff *skb, __be32 *buf) { … } /** * batadv_dat_get_dhcp_chaddr() - get chaddr from a DHCP packet * @skb: the DHCP packet to parse * @buf: a buffer to store the chaddr in * * Caller needs to ensure that the given skb is a valid DHCP packet and * that the skb transport header is set correctly. * * Return: True on success, false otherwise */ static bool batadv_dat_get_dhcp_chaddr(struct sk_buff *skb, u8 *buf) { … } /** * batadv_dat_put_dhcp() - puts addresses from a DHCP packet into the DHT and * DAT cache * @bat_priv: the bat priv with all the soft interface information * @chaddr: the DHCP client MAC address * @yiaddr: the DHCP client IP address * @hw_dst: the DHCP server MAC address * @ip_dst: the DHCP server IP address * @vid: VLAN identifier * * Adds given MAC/IP pairs to the local DAT cache and propagates them further * into the DHT. * * For the DHT propagation, client MAC + IP will appear as the ARP Reply * transmitter (and hw_dst/ip_dst as the target). */ static void batadv_dat_put_dhcp(struct batadv_priv *bat_priv, u8 *chaddr, __be32 yiaddr, u8 *hw_dst, __be32 ip_dst, unsigned short vid) { … } /** * batadv_dat_check_dhcp_ack() - examine packet for valid DHCP message * @skb: the packet to check * @proto: ethernet protocol hint (behind a potential vlan) * @ip_src: a buffer to store the IPv4 source address in * @chaddr: a buffer to store the DHCP Client Hardware Address in * @yiaddr: a buffer to store the DHCP Your IP Address in * * Checks whether the given skb is a valid DHCPACK. And if so, stores the * IPv4 server source address (ip_src), client MAC address (chaddr) and client * IPv4 address (yiaddr) in the provided buffers. * * Caller needs to ensure that the skb network header is set correctly. * * Return: True if the skb is a valid DHCPACK. False otherwise. */ static bool batadv_dat_check_dhcp_ack(struct sk_buff *skb, __be16 proto, __be32 *ip_src, u8 *chaddr, __be32 *yiaddr) { … } /** * batadv_dat_snoop_outgoing_dhcp_ack() - snoop DHCPACK and fill DAT with it * @bat_priv: the bat priv with all the soft interface information * @skb: the packet to snoop * @proto: ethernet protocol hint (behind a potential vlan) * @vid: VLAN identifier * * This function first checks whether the given skb is a valid DHCPACK. If * so then its source MAC and IP as well as its DHCP Client Hardware Address * field and DHCP Your IP Address field are added to the local DAT cache and * propagated into the DHT. * * Caller needs to ensure that the skb mac and network headers are set * correctly. */ void batadv_dat_snoop_outgoing_dhcp_ack(struct batadv_priv *bat_priv, struct sk_buff *skb, __be16 proto, unsigned short vid) { … } /** * batadv_dat_snoop_incoming_dhcp_ack() - snoop DHCPACK and fill DAT cache * @bat_priv: the bat priv with all the soft interface information * @skb: the packet to snoop * @hdr_size: header size, up to the tail of the batman-adv header * * This function first checks whether the given skb is a valid DHCPACK. If * so then its source MAC and IP as well as its DHCP Client Hardware Address * field and DHCP Your IP Address field are added to the local DAT cache. */ void batadv_dat_snoop_incoming_dhcp_ack(struct batadv_priv *bat_priv, struct sk_buff *skb, int hdr_size) { … } /** * batadv_dat_drop_broadcast_packet() - check if an ARP request has to be * dropped (because the node has already obtained the reply via DAT) or not * @bat_priv: the bat priv with all the soft interface information * @forw_packet: the broadcast packet * * Return: true if the node can drop the packet, false otherwise. */ bool batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv, struct batadv_forw_packet *forw_packet) { … }
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