batman-adv: add B.A.T.M.A.N. Dump BLA claims via netlink
Dump the list of bridge loop avoidance claims via the netlink socket. Signed-off-by: Andrew Lunn <andrew@lunn.ch> [sven.eckelmann@open-mesh.com: add policy for attributes, fix includes, fix soft_iface reference leak] Signed-off-by: Sven Eckelmann <sven.eckelmann@open-mesh.com> [sw@simonwunderlich.de: fix kerneldoc, fix error reporting] Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
This commit is contained in:
Andrew Lunn
committed by
Simon Wunderlich
Simon Wunderlich
parent
b71bb6f924
commit
04f3f5bf18
@@ -35,6 +35,7 @@
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#include <linux/list.h>
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#include <linux/lockdep.h>
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#include <linux/netdevice.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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@@ -45,12 +46,18 @@
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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 "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 "packet.h"
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#include "soft-interface.h"
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#include "sysfs.h"
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#include "translation-table.h"
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@@ -2051,6 +2058,168 @@ out:
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return 0;
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}
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/**
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* batadv_bla_claim_dump_entry - dump one entry of the claim table
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* to 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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* @primary_if: primary interface
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* @claim: 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_bla_claim_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
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struct batadv_hard_iface *primary_if,
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struct batadv_bla_claim *claim)
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{
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u8 *primary_addr = primary_if->net_dev->dev_addr;
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u16 backbone_crc;
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bool is_own;
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void *hdr;
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int ret = -EINVAL;
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hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
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NLM_F_MULTI, BATADV_CMD_GET_BLA_CLAIM);
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if (!hdr) {
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ret = -ENOBUFS;
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goto out;
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}
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is_own = batadv_compare_eth(claim->backbone_gw->orig,
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primary_addr);
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spin_lock_bh(&claim->backbone_gw->crc_lock);
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backbone_crc = claim->backbone_gw->crc;
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spin_unlock_bh(&claim->backbone_gw->crc_lock);
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if (is_own)
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if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) {
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genlmsg_cancel(msg, hdr);
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goto out;
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}
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if (nla_put(msg, BATADV_ATTR_BLA_ADDRESS, ETH_ALEN, claim->addr) ||
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nla_put_u16(msg, BATADV_ATTR_BLA_VID, claim->vid) ||
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nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN,
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claim->backbone_gw->orig) ||
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nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
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backbone_crc)) {
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genlmsg_cancel(msg, hdr);
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goto out;
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}
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genlmsg_end(msg, hdr);
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ret = 0;
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out:
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return ret;
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}
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/**
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* batadv_bla_claim_dump_bucket - dump one bucket of the claim table
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* to 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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* @primary_if: primary interface
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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: always 0.
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*/
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static int
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batadv_bla_claim_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
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struct batadv_hard_iface *primary_if,
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struct hlist_head *head, int *idx_skip)
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{
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struct batadv_bla_claim *claim;
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int idx = 0;
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rcu_read_lock();
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hlist_for_each_entry_rcu(claim, head, hash_entry) {
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if (idx++ < *idx_skip)
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continue;
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if (batadv_bla_claim_dump_entry(msg, portid, seq,
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primary_if, claim)) {
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*idx_skip = idx - 1;
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goto unlock;
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}
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}
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*idx_skip = idx;
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unlock:
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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_bla_claim_dump - dump claim 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_bla_claim_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->bla.claim_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_bla_claim_dump_bucket(msg, portid,
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cb->nlh->nlmsg_seq,
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primary_if, head, &idx))
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break;
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bucket++;
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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_bla_backbone_table_seq_print_text - print the backbone table in a seq
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* file
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