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batman-adv: add DAT cache netlink support
Dump the list of DAT cache entries via the netlink socket. Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue> Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
This commit is contained in:
Linus Lüssing
Simon Wunderlich
parent
6b2536039f
commit
41aeefcc38
@ -272,6 +272,21 @@ enum batadv_nl_attrs {
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*/
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BATADV_ATTR_BLA_CRC,
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/**
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* @BATADV_ATTR_DAT_CACHE_IP4ADDRESS: Client IPv4 address
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*/
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BATADV_ATTR_DAT_CACHE_IP4ADDRESS,
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/**
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* @BATADV_ATTR_DAT_CACHE_HWADDRESS: Client MAC address
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*/
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BATADV_ATTR_DAT_CACHE_HWADDRESS,
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/**
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* @BATADV_ATTR_DAT_CACHE_VID: VLAN ID
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*/
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BATADV_ATTR_DAT_CACHE_VID,
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/* add attributes above here, update the policy in netlink.c */
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/**
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@ -361,6 +376,11 @@ enum batadv_nl_commands {
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*/
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BATADV_CMD_GET_BLA_BACKBONE,
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/**
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* @BATADV_CMD_GET_DAT_CACHE: Query list of DAT cache entries
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*/
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BATADV_CMD_GET_DAT_CACHE,
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/* add new commands above here */
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/**
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@ -33,6 +33,7 @@
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#include <linux/kernel.h>
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#include <linux/kref.h>
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#include <linux/list.h>
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#include <linux/netlink.h>
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#include <linux/rculist.h>
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#include <linux/rcupdate.h>
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#include <linux/seq_file.h>
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@ -43,13 +44,19 @@
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#include <linux/string.h>
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#include <linux/workqueue.h>
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#include <net/arp.h>
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#include <net/genetlink.h>
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#include <net/netlink.h>
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#include <net/sock.h>
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#include <uapi/linux/batman_adv.h>
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#include "bridge_loop_avoidance.h"
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#include "hard-interface.h"
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#include "hash.h"
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#include "log.h"
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#include "netlink.h"
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#include "originator.h"
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#include "send.h"
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#include "soft-interface.h"
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#include "translation-table.h"
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#include "tvlv.h"
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@ -851,6 +858,151 @@ out:
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}
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#endif
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/**
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* batadv_dat_cache_dump_entry() - dump one entry of the DAT cache table to a
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* netlink socket
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* @msg: buffer for the message
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* @portid: netlink port
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* @seq: Sequence number of netlink message
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* @dat_entry: entry to dump
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*
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* Return: 0 or error code.
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*/
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static int
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batadv_dat_cache_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
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struct batadv_dat_entry *dat_entry)
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{
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int msecs;
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void *hdr;
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hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
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NLM_F_MULTI, BATADV_CMD_GET_DAT_CACHE);
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if (!hdr)
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return -ENOBUFS;
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msecs = jiffies_to_msecs(jiffies - dat_entry->last_update);
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if (nla_put_in_addr(msg, BATADV_ATTR_DAT_CACHE_IP4ADDRESS,
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dat_entry->ip) ||
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nla_put(msg, BATADV_ATTR_DAT_CACHE_HWADDRESS, ETH_ALEN,
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dat_entry->mac_addr) ||
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nla_put_u16(msg, BATADV_ATTR_DAT_CACHE_VID, dat_entry->vid) ||
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nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, msecs)) {
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genlmsg_cancel(msg, hdr);
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return -EMSGSIZE;
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}
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genlmsg_end(msg, hdr);
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return 0;
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}
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/**
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* batadv_dat_cache_dump_bucket() - dump one bucket of the DAT cache table to
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* a netlink socket
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* @msg: buffer for the message
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* @portid: netlink port
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* @seq: Sequence number of netlink message
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* @head: bucket to dump
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* @idx_skip: How many entries to skip
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*
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* Return: 0 or error code.
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*/
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static int
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batadv_dat_cache_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
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struct hlist_head *head, int *idx_skip)
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{
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struct batadv_dat_entry *dat_entry;
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int idx = 0;
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rcu_read_lock();
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hlist_for_each_entry_rcu(dat_entry, head, hash_entry) {
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if (idx < *idx_skip)
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goto skip;
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if (batadv_dat_cache_dump_entry(msg, portid, seq,
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dat_entry)) {
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rcu_read_unlock();
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*idx_skip = idx;
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return -EMSGSIZE;
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}
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skip:
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idx++;
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}
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rcu_read_unlock();
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return 0;
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}
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/**
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* batadv_dat_cache_dump() - dump DAT cache table to a netlink socket
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* @msg: buffer for the message
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* @cb: callback structure containing arguments
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*
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* Return: message length.
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*/
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int batadv_dat_cache_dump(struct sk_buff *msg, struct netlink_callback *cb)
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{
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struct batadv_hard_iface *primary_if = NULL;
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int portid = NETLINK_CB(cb->skb).portid;
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struct net *net = sock_net(cb->skb->sk);
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struct net_device *soft_iface;
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struct batadv_hashtable *hash;
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struct batadv_priv *bat_priv;
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int bucket = cb->args[0];
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struct hlist_head *head;
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int idx = cb->args[1];
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int ifindex;
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int ret = 0;
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ifindex = batadv_netlink_get_ifindex(cb->nlh,
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BATADV_ATTR_MESH_IFINDEX);
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if (!ifindex)
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return -EINVAL;
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soft_iface = dev_get_by_index(net, ifindex);
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if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
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ret = -ENODEV;
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goto out;
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}
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bat_priv = netdev_priv(soft_iface);
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hash = bat_priv->dat.hash;
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primary_if = batadv_primary_if_get_selected(bat_priv);
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if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
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ret = -ENOENT;
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goto out;
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}
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while (bucket < hash->size) {
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head = &hash->table[bucket];
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if (batadv_dat_cache_dump_bucket(msg, portid,
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cb->nlh->nlmsg_seq, head,
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&idx))
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break;
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bucket++;
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idx = 0;
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}
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cb->args[0] = bucket;
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cb->args[1] = idx;
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ret = msg->len;
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out:
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if (primary_if)
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batadv_hardif_put(primary_if);
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if (soft_iface)
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dev_put(soft_iface);
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return ret;
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}
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/**
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* batadv_arp_get_type() - parse an ARP packet and gets the type
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* @bat_priv: the bat priv with all the soft interface information
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@ -28,6 +28,7 @@
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#include "originator.h"
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struct netlink_callback;
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struct seq_file;
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struct sk_buff;
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@ -81,6 +82,7 @@ batadv_dat_init_own_addr(struct batadv_priv *bat_priv,
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int batadv_dat_init(struct batadv_priv *bat_priv);
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void batadv_dat_free(struct batadv_priv *bat_priv);
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int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset);
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int batadv_dat_cache_dump(struct sk_buff *msg, struct netlink_callback *cb);
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/**
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* batadv_dat_inc_counter() - increment the correct DAT packet counter
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@ -169,6 +171,12 @@ static inline void batadv_dat_free(struct batadv_priv *bat_priv)
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{
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}
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static inline int
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batadv_dat_cache_dump(struct sk_buff *msg, struct netlink_callback *cb)
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{
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return -EOPNOTSUPP;
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}
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static inline void batadv_dat_inc_counter(struct batadv_priv *bat_priv,
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u8 subtype)
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{
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@ -45,6 +45,7 @@
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#include "bat_algo.h"
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#include "bridge_loop_avoidance.h"
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#include "distributed-arp-table.h"
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#include "gateway_client.h"
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#include "hard-interface.h"
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#include "originator.h"
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@ -64,39 +65,42 @@ static const struct genl_multicast_group batadv_netlink_mcgrps[] = {
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};
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static const struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = {
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[BATADV_ATTR_VERSION] = { .type = NLA_STRING },
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[BATADV_ATTR_ALGO_NAME] = { .type = NLA_STRING },
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[BATADV_ATTR_MESH_IFINDEX] = { .type = NLA_U32 },
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[BATADV_ATTR_MESH_IFNAME] = { .type = NLA_STRING },
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[BATADV_ATTR_MESH_ADDRESS] = { .len = ETH_ALEN },
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[BATADV_ATTR_HARD_IFINDEX] = { .type = NLA_U32 },
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[BATADV_ATTR_HARD_IFNAME] = { .type = NLA_STRING },
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[BATADV_ATTR_HARD_ADDRESS] = { .len = ETH_ALEN },
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[BATADV_ATTR_ORIG_ADDRESS] = { .len = ETH_ALEN },
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[BATADV_ATTR_TPMETER_RESULT] = { .type = NLA_U8 },
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[BATADV_ATTR_TPMETER_TEST_TIME] = { .type = NLA_U32 },
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[BATADV_ATTR_TPMETER_BYTES] = { .type = NLA_U64 },
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[BATADV_ATTR_TPMETER_COOKIE] = { .type = NLA_U32 },
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[BATADV_ATTR_ACTIVE] = { .type = NLA_FLAG },
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[BATADV_ATTR_TT_ADDRESS] = { .len = ETH_ALEN },
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[BATADV_ATTR_TT_TTVN] = { .type = NLA_U8 },
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[BATADV_ATTR_TT_LAST_TTVN] = { .type = NLA_U8 },
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[BATADV_ATTR_TT_CRC32] = { .type = NLA_U32 },
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[BATADV_ATTR_TT_VID] = { .type = NLA_U16 },
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[BATADV_ATTR_TT_FLAGS] = { .type = NLA_U32 },
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[BATADV_ATTR_FLAG_BEST] = { .type = NLA_FLAG },
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[BATADV_ATTR_LAST_SEEN_MSECS] = { .type = NLA_U32 },
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[BATADV_ATTR_NEIGH_ADDRESS] = { .len = ETH_ALEN },
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[BATADV_ATTR_TQ] = { .type = NLA_U8 },
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[BATADV_ATTR_THROUGHPUT] = { .type = NLA_U32 },
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[BATADV_ATTR_BANDWIDTH_UP] = { .type = NLA_U32 },
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[BATADV_ATTR_BANDWIDTH_DOWN] = { .type = NLA_U32 },
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[BATADV_ATTR_ROUTER] = { .len = ETH_ALEN },
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[BATADV_ATTR_BLA_OWN] = { .type = NLA_FLAG },
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[BATADV_ATTR_BLA_ADDRESS] = { .len = ETH_ALEN },
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[BATADV_ATTR_BLA_VID] = { .type = NLA_U16 },
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[BATADV_ATTR_BLA_BACKBONE] = { .len = ETH_ALEN },
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[BATADV_ATTR_BLA_CRC] = { .type = NLA_U16 },
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[BATADV_ATTR_VERSION] = { .type = NLA_STRING },
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[BATADV_ATTR_ALGO_NAME] = { .type = NLA_STRING },
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[BATADV_ATTR_MESH_IFINDEX] = { .type = NLA_U32 },
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[BATADV_ATTR_MESH_IFNAME] = { .type = NLA_STRING },
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[BATADV_ATTR_MESH_ADDRESS] = { .len = ETH_ALEN },
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[BATADV_ATTR_HARD_IFINDEX] = { .type = NLA_U32 },
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[BATADV_ATTR_HARD_IFNAME] = { .type = NLA_STRING },
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[BATADV_ATTR_HARD_ADDRESS] = { .len = ETH_ALEN },
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[BATADV_ATTR_ORIG_ADDRESS] = { .len = ETH_ALEN },
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[BATADV_ATTR_TPMETER_RESULT] = { .type = NLA_U8 },
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[BATADV_ATTR_TPMETER_TEST_TIME] = { .type = NLA_U32 },
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[BATADV_ATTR_TPMETER_BYTES] = { .type = NLA_U64 },
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[BATADV_ATTR_TPMETER_COOKIE] = { .type = NLA_U32 },
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[BATADV_ATTR_ACTIVE] = { .type = NLA_FLAG },
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[BATADV_ATTR_TT_ADDRESS] = { .len = ETH_ALEN },
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[BATADV_ATTR_TT_TTVN] = { .type = NLA_U8 },
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[BATADV_ATTR_TT_LAST_TTVN] = { .type = NLA_U8 },
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[BATADV_ATTR_TT_CRC32] = { .type = NLA_U32 },
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[BATADV_ATTR_TT_VID] = { .type = NLA_U16 },
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[BATADV_ATTR_TT_FLAGS] = { .type = NLA_U32 },
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[BATADV_ATTR_FLAG_BEST] = { .type = NLA_FLAG },
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[BATADV_ATTR_LAST_SEEN_MSECS] = { .type = NLA_U32 },
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[BATADV_ATTR_NEIGH_ADDRESS] = { .len = ETH_ALEN },
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[BATADV_ATTR_TQ] = { .type = NLA_U8 },
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[BATADV_ATTR_THROUGHPUT] = { .type = NLA_U32 },
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[BATADV_ATTR_BANDWIDTH_UP] = { .type = NLA_U32 },
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[BATADV_ATTR_BANDWIDTH_DOWN] = { .type = NLA_U32 },
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[BATADV_ATTR_ROUTER] = { .len = ETH_ALEN },
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[BATADV_ATTR_BLA_OWN] = { .type = NLA_FLAG },
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[BATADV_ATTR_BLA_ADDRESS] = { .len = ETH_ALEN },
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[BATADV_ATTR_BLA_VID] = { .type = NLA_U16 },
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[BATADV_ATTR_BLA_BACKBONE] = { .len = ETH_ALEN },
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[BATADV_ATTR_BLA_CRC] = { .type = NLA_U16 },
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[BATADV_ATTR_DAT_CACHE_IP4ADDRESS] = { .type = NLA_U32 },
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[BATADV_ATTR_DAT_CACHE_HWADDRESS] = { .len = ETH_ALEN },
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[BATADV_ATTR_DAT_CACHE_VID] = { .type = NLA_U16 },
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};
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/**
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@ -604,6 +608,12 @@ static const struct genl_ops batadv_netlink_ops[] = {
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.policy = batadv_netlink_policy,
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.dumpit = batadv_bla_backbone_dump,
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},
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{
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.cmd = BATADV_CMD_GET_DAT_CACHE,
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.flags = GENL_ADMIN_PERM,
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.policy = batadv_netlink_policy,
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.dumpit = batadv_dat_cache_dump,
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},
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};
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