batman-adv: add multicast flags netlink support

Dump the list of multicast flags 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 2018-03-13 11:41:13 +01:00 committed by Simon Wunderlich
parent 41aeefcc38
commit 53dd9a68ba
4 changed files with 329 additions and 0 deletions

View File

@ -91,6 +91,53 @@ enum batadv_tt_client_flags {
BATADV_TT_CLIENT_TEMP = (1 << 11),
};
/**
* enum batadv_mcast_flags_priv - Private, own multicast flags
*
* These are internal, multicast related flags. Currently they describe certain
* multicast related attributes of the segment this originator bridges into the
* mesh.
*
* Those attributes are used to determine the public multicast flags this
* originator is going to announce via TT.
*
* For netlink, if BATADV_MCAST_FLAGS_BRIDGED is unset then all querier
* related flags are undefined.
*/
enum batadv_mcast_flags_priv {
/**
* @BATADV_MCAST_FLAGS_BRIDGED: There is a bridge on top of the mesh
* interface.
*/
BATADV_MCAST_FLAGS_BRIDGED = (1 << 0),
/**
* @BATADV_MCAST_FLAGS_QUERIER_IPV4_EXISTS: Whether an IGMP querier
* exists in the mesh
*/
BATADV_MCAST_FLAGS_QUERIER_IPV4_EXISTS = (1 << 1),
/**
* @BATADV_MCAST_FLAGS_QUERIER_IPV6_EXISTS: Whether an MLD querier
* exists in the mesh
*/
BATADV_MCAST_FLAGS_QUERIER_IPV6_EXISTS = (1 << 2),
/**
* @BATADV_MCAST_FLAGS_QUERIER_IPV4_SHADOWING: If an IGMP querier
* exists, whether it is potentially shadowing multicast listeners
* (i.e. querier is behind our own bridge segment)
*/
BATADV_MCAST_FLAGS_QUERIER_IPV4_SHADOWING = (1 << 3),
/**
* @BATADV_MCAST_FLAGS_QUERIER_IPV6_SHADOWING: If an MLD querier
* exists, whether it is potentially shadowing multicast listeners
* (i.e. querier is behind our own bridge segment)
*/
BATADV_MCAST_FLAGS_QUERIER_IPV6_SHADOWING = (1 << 4),
};
/**
* enum batadv_nl_attrs - batman-adv netlink attributes
*/
@ -287,6 +334,16 @@ enum batadv_nl_attrs {
*/
BATADV_ATTR_DAT_CACHE_VID,
/**
* @BATADV_ATTR_MCAST_FLAGS: Per originator multicast flags
*/
BATADV_ATTR_MCAST_FLAGS,
/**
* @BATADV_ATTR_MCAST_FLAGS_PRIV: Private, own multicast flags
*/
BATADV_ATTR_MCAST_FLAGS_PRIV,
/* add attributes above here, update the policy in netlink.c */
/**
@ -381,6 +438,11 @@ enum batadv_nl_commands {
*/
BATADV_CMD_GET_DAT_CACHE,
/**
* @BATADV_CMD_GET_MCAST_FLAGS: Query list of multicast flags
*/
BATADV_CMD_GET_MCAST_FLAGS,
/* add new commands above here */
/**

View File

@ -40,6 +40,7 @@
#include <linux/list.h>
#include <linux/lockdep.h>
#include <linux/netdevice.h>
#include <linux/netlink.h>
#include <linux/printk.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
@ -52,14 +53,20 @@
#include <linux/types.h>
#include <linux/workqueue.h>
#include <net/addrconf.h>
#include <net/genetlink.h>
#include <net/if_inet6.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/netlink.h>
#include <net/sock.h>
#include <uapi/linux/batadv_packet.h>
#include <uapi/linux/batman_adv.h>
#include "hard-interface.h"
#include "hash.h"
#include "log.h"
#include "netlink.h"
#include "soft-interface.h"
#include "translation-table.h"
#include "tvlv.h"
@ -1333,6 +1340,236 @@ int batadv_mcast_flags_seq_print_text(struct seq_file *seq, void *offset)
}
#endif
/**
* batadv_mcast_mesh_info_put() - put multicast info into a netlink message
* @msg: buffer for the message
* @bat_priv: the bat priv with all the soft interface information
*
* Return: 0 or error code.
*/
int batadv_mcast_mesh_info_put(struct sk_buff *msg,
struct batadv_priv *bat_priv)
{
u32 flags = bat_priv->mcast.flags;
u32 flags_priv = BATADV_NO_FLAGS;
if (bat_priv->mcast.bridged) {
flags_priv |= BATADV_MCAST_FLAGS_BRIDGED;
if (bat_priv->mcast.querier_ipv4.exists)
flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_EXISTS;
if (bat_priv->mcast.querier_ipv6.exists)
flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_EXISTS;
if (bat_priv->mcast.querier_ipv4.shadowing)
flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_SHADOWING;
if (bat_priv->mcast.querier_ipv6.shadowing)
flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_SHADOWING;
}
if (nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS, flags) ||
nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS_PRIV, flags_priv))
return -EMSGSIZE;
return 0;
}
/**
* batadv_mcast_flags_dump_entry() - dump one entry of the multicast flags table
* to a netlink socket
* @msg: buffer for the message
* @portid: netlink port
* @seq: Sequence number of netlink message
* @orig_node: originator to dump the multicast flags of
*
* Return: 0 or error code.
*/
static int
batadv_mcast_flags_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
struct batadv_orig_node *orig_node)
{
void *hdr;
hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
NLM_F_MULTI, BATADV_CMD_GET_MCAST_FLAGS);
if (!hdr)
return -ENOBUFS;
if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
orig_node->orig)) {
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}
if (test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
&orig_node->capabilities)) {
if (nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS,
orig_node->mcast_flags)) {
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}
}
genlmsg_end(msg, hdr);
return 0;
}
/**
* batadv_mcast_flags_dump_bucket() - dump one bucket of the multicast flags
* table to a netlink socket
* @msg: buffer for the message
* @portid: netlink port
* @seq: Sequence number of netlink message
* @head: bucket to dump
* @idx_skip: How many entries to skip
*
* Return: 0 or error code.
*/
static int
batadv_mcast_flags_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
struct hlist_head *head, long *idx_skip)
{
struct batadv_orig_node *orig_node;
long idx = 0;
rcu_read_lock();
hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
&orig_node->capa_initialized))
continue;
if (idx < *idx_skip)
goto skip;
if (batadv_mcast_flags_dump_entry(msg, portid, seq,
orig_node)) {
rcu_read_unlock();
*idx_skip = idx;
return -EMSGSIZE;
}
skip:
idx++;
}
rcu_read_unlock();
return 0;
}
/**
* __batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket
* @msg: buffer for the message
* @portid: netlink port
* @seq: Sequence number of netlink message
* @bat_priv: the bat priv with all the soft interface information
* @bucket: current bucket to dump
* @idx: index in current bucket to the next entry to dump
*
* Return: 0 or error code.
*/
static int
__batadv_mcast_flags_dump(struct sk_buff *msg, u32 portid, u32 seq,
struct batadv_priv *bat_priv, long *bucket, long *idx)
{
struct batadv_hashtable *hash = bat_priv->orig_hash;
long bucket_tmp = *bucket;
struct hlist_head *head;
long idx_tmp = *idx;
while (bucket_tmp < hash->size) {
head = &hash->table[bucket_tmp];
if (batadv_mcast_flags_dump_bucket(msg, portid, seq, head,
&idx_tmp))
break;
bucket_tmp++;
idx_tmp = 0;
}
*bucket = bucket_tmp;
*idx = idx_tmp;
return msg->len;
}
/**
* batadv_mcast_netlink_get_primary() - get primary interface from netlink
* callback
* @cb: netlink callback structure
* @primary_if: the primary interface pointer to return the result in
*
* Return: 0 or error code.
*/
static int
batadv_mcast_netlink_get_primary(struct netlink_callback *cb,
struct batadv_hard_iface **primary_if)
{
struct batadv_hard_iface *hard_iface = NULL;
struct net *net = sock_net(cb->skb->sk);
struct net_device *soft_iface;
struct batadv_priv *bat_priv;
int ifindex;
int ret = 0;
ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
if (!ifindex)
return -EINVAL;
soft_iface = dev_get_by_index(net, ifindex);
if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
ret = -ENODEV;
goto out;
}
bat_priv = netdev_priv(soft_iface);
hard_iface = batadv_primary_if_get_selected(bat_priv);
if (!hard_iface || hard_iface->if_status != BATADV_IF_ACTIVE) {
ret = -ENOENT;
goto out;
}
out:
if (soft_iface)
dev_put(soft_iface);
if (!ret && primary_if)
*primary_if = hard_iface;
else
batadv_hardif_put(hard_iface);
return ret;
}
/**
* batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket
* @msg: buffer for the message
* @cb: callback structure containing arguments
*
* Return: message length.
*/
int batadv_mcast_flags_dump(struct sk_buff *msg, struct netlink_callback *cb)
{
struct batadv_hard_iface *primary_if = NULL;
int portid = NETLINK_CB(cb->skb).portid;
struct batadv_priv *bat_priv;
long *bucket = &cb->args[0];
long *idx = &cb->args[1];
int ret;
ret = batadv_mcast_netlink_get_primary(cb, &primary_if);
if (ret)
return ret;
bat_priv = netdev_priv(primary_if->soft_iface);
ret = __batadv_mcast_flags_dump(msg, portid, cb->nlh->nlmsg_seq,
bat_priv, bucket, idx);
batadv_hardif_put(primary_if);
return ret;
}
/**
* batadv_mcast_free() - free the multicast optimizations structures
* @bat_priv: the bat priv with all the soft interface information

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@ -21,6 +21,7 @@
#include "main.h"
struct netlink_callback;
struct seq_file;
struct sk_buff;
@ -54,6 +55,11 @@ void batadv_mcast_init(struct batadv_priv *bat_priv);
int batadv_mcast_flags_seq_print_text(struct seq_file *seq, void *offset);
int batadv_mcast_mesh_info_put(struct sk_buff *msg,
struct batadv_priv *bat_priv);
int batadv_mcast_flags_dump(struct sk_buff *msg, struct netlink_callback *cb);
void batadv_mcast_free(struct batadv_priv *bat_priv);
void batadv_mcast_purge_orig(struct batadv_orig_node *orig_node);
@ -72,6 +78,18 @@ static inline int batadv_mcast_init(struct batadv_priv *bat_priv)
return 0;
}
static inline int
batadv_mcast_mesh_info_put(struct sk_buff *msg, struct batadv_priv *bat_priv)
{
return 0;
}
static inline int batadv_mcast_flags_dump(struct sk_buff *msg,
struct netlink_callback *cb)
{
return -EOPNOTSUPP;
}
static inline void batadv_mcast_free(struct batadv_priv *bat_priv)
{
}

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@ -48,6 +48,7 @@
#include "distributed-arp-table.h"
#include "gateway_client.h"
#include "hard-interface.h"
#include "multicast.h"
#include "originator.h"
#include "soft-interface.h"
#include "tp_meter.h"
@ -101,6 +102,8 @@ static const struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = {
[BATADV_ATTR_DAT_CACHE_IP4ADDRESS] = { .type = NLA_U32 },
[BATADV_ATTR_DAT_CACHE_HWADDRESS] = { .len = ETH_ALEN },
[BATADV_ATTR_DAT_CACHE_VID] = { .type = NLA_U16 },
[BATADV_ATTR_MCAST_FLAGS] = { .type = NLA_U32 },
[BATADV_ATTR_MCAST_FLAGS_PRIV] = { .type = NLA_U32 },
};
/**
@ -151,6 +154,9 @@ batadv_netlink_mesh_info_put(struct sk_buff *msg, struct net_device *soft_iface)
goto out;
#endif
if (batadv_mcast_mesh_info_put(msg, bat_priv))
goto out;
primary_if = batadv_primary_if_get_selected(bat_priv);
if (primary_if && primary_if->if_status == BATADV_IF_ACTIVE) {
hard_iface = primary_if->net_dev;
@ -614,6 +620,12 @@ static const struct genl_ops batadv_netlink_ops[] = {
.policy = batadv_netlink_policy,
.dumpit = batadv_dat_cache_dump,
},
{
.cmd = BATADV_CMD_GET_MCAST_FLAGS,
.flags = GENL_ADMIN_PERM,
.policy = batadv_netlink_policy,
.dumpit = batadv_mcast_flags_dump,
},
};