linux/net/batman-adv/netlink.c
Linus Lüssing 53dd9a68ba 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>
2018-03-14 10:15:34 +01:00

664 lines
17 KiB
C

// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2016-2018 B.A.T.M.A.N. contributors:
*
* Matthias Schiffer
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "netlink.h"
#include "main.h"
#include <linux/atomic.h>
#include <linux/byteorder/generic.h>
#include <linux/cache.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/genetlink.h>
#include <linux/gfp.h>
#include <linux/if_ether.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/netlink.h>
#include <linux/printk.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/skbuff.h>
#include <linux/stddef.h>
#include <linux/types.h>
#include <net/genetlink.h>
#include <net/netlink.h>
#include <net/sock.h>
#include <uapi/linux/batadv_packet.h>
#include <uapi/linux/batman_adv.h>
#include "bat_algo.h"
#include "bridge_loop_avoidance.h"
#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"
#include "translation-table.h"
struct genl_family batadv_netlink_family;
/* multicast groups */
enum batadv_netlink_multicast_groups {
BATADV_NL_MCGRP_TPMETER,
};
static const struct genl_multicast_group batadv_netlink_mcgrps[] = {
[BATADV_NL_MCGRP_TPMETER] = { .name = BATADV_NL_MCAST_GROUP_TPMETER },
};
static const struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = {
[BATADV_ATTR_VERSION] = { .type = NLA_STRING },
[BATADV_ATTR_ALGO_NAME] = { .type = NLA_STRING },
[BATADV_ATTR_MESH_IFINDEX] = { .type = NLA_U32 },
[BATADV_ATTR_MESH_IFNAME] = { .type = NLA_STRING },
[BATADV_ATTR_MESH_ADDRESS] = { .len = ETH_ALEN },
[BATADV_ATTR_HARD_IFINDEX] = { .type = NLA_U32 },
[BATADV_ATTR_HARD_IFNAME] = { .type = NLA_STRING },
[BATADV_ATTR_HARD_ADDRESS] = { .len = ETH_ALEN },
[BATADV_ATTR_ORIG_ADDRESS] = { .len = ETH_ALEN },
[BATADV_ATTR_TPMETER_RESULT] = { .type = NLA_U8 },
[BATADV_ATTR_TPMETER_TEST_TIME] = { .type = NLA_U32 },
[BATADV_ATTR_TPMETER_BYTES] = { .type = NLA_U64 },
[BATADV_ATTR_TPMETER_COOKIE] = { .type = NLA_U32 },
[BATADV_ATTR_ACTIVE] = { .type = NLA_FLAG },
[BATADV_ATTR_TT_ADDRESS] = { .len = ETH_ALEN },
[BATADV_ATTR_TT_TTVN] = { .type = NLA_U8 },
[BATADV_ATTR_TT_LAST_TTVN] = { .type = NLA_U8 },
[BATADV_ATTR_TT_CRC32] = { .type = NLA_U32 },
[BATADV_ATTR_TT_VID] = { .type = NLA_U16 },
[BATADV_ATTR_TT_FLAGS] = { .type = NLA_U32 },
[BATADV_ATTR_FLAG_BEST] = { .type = NLA_FLAG },
[BATADV_ATTR_LAST_SEEN_MSECS] = { .type = NLA_U32 },
[BATADV_ATTR_NEIGH_ADDRESS] = { .len = ETH_ALEN },
[BATADV_ATTR_TQ] = { .type = NLA_U8 },
[BATADV_ATTR_THROUGHPUT] = { .type = NLA_U32 },
[BATADV_ATTR_BANDWIDTH_UP] = { .type = NLA_U32 },
[BATADV_ATTR_BANDWIDTH_DOWN] = { .type = NLA_U32 },
[BATADV_ATTR_ROUTER] = { .len = ETH_ALEN },
[BATADV_ATTR_BLA_OWN] = { .type = NLA_FLAG },
[BATADV_ATTR_BLA_ADDRESS] = { .len = ETH_ALEN },
[BATADV_ATTR_BLA_VID] = { .type = NLA_U16 },
[BATADV_ATTR_BLA_BACKBONE] = { .len = ETH_ALEN },
[BATADV_ATTR_BLA_CRC] = { .type = NLA_U16 },
[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 },
};
/**
* batadv_netlink_get_ifindex() - Extract an interface index from a message
* @nlh: Message header
* @attrtype: Attribute which holds an interface index
*
* Return: interface index, or 0.
*/
int
batadv_netlink_get_ifindex(const struct nlmsghdr *nlh, int attrtype)
{
struct nlattr *attr = nlmsg_find_attr(nlh, GENL_HDRLEN, attrtype);
return attr ? nla_get_u32(attr) : 0;
}
/**
* batadv_netlink_mesh_info_put() - fill in generic information about mesh
* interface
* @msg: netlink message to be sent back
* @soft_iface: interface for which the data should be taken
*
* Return: 0 on success, < 0 on error
*/
static int
batadv_netlink_mesh_info_put(struct sk_buff *msg, struct net_device *soft_iface)
{
struct batadv_priv *bat_priv = netdev_priv(soft_iface);
struct batadv_hard_iface *primary_if = NULL;
struct net_device *hard_iface;
int ret = -ENOBUFS;
if (nla_put_string(msg, BATADV_ATTR_VERSION, BATADV_SOURCE_VERSION) ||
nla_put_string(msg, BATADV_ATTR_ALGO_NAME,
bat_priv->algo_ops->name) ||
nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX, soft_iface->ifindex) ||
nla_put_string(msg, BATADV_ATTR_MESH_IFNAME, soft_iface->name) ||
nla_put(msg, BATADV_ATTR_MESH_ADDRESS, ETH_ALEN,
soft_iface->dev_addr) ||
nla_put_u8(msg, BATADV_ATTR_TT_TTVN,
(u8)atomic_read(&bat_priv->tt.vn)))
goto out;
#ifdef CONFIG_BATMAN_ADV_BLA
if (nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
ntohs(bat_priv->bla.claim_dest.group)))
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;
if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
hard_iface->ifindex) ||
nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
hard_iface->name) ||
nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
hard_iface->dev_addr))
goto out;
}
ret = 0;
out:
if (primary_if)
batadv_hardif_put(primary_if);
return ret;
}
/**
* batadv_netlink_get_mesh_info() - handle incoming BATADV_CMD_GET_MESH_INFO
* netlink request
* @skb: received netlink message
* @info: receiver information
*
* Return: 0 on success, < 0 on error
*/
static int
batadv_netlink_get_mesh_info(struct sk_buff *skb, struct genl_info *info)
{
struct net *net = genl_info_net(info);
struct net_device *soft_iface;
struct sk_buff *msg = NULL;
void *msg_head;
int ifindex;
int ret;
if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
return -EINVAL;
ifindex = nla_get_u32(info->attrs[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;
}
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg) {
ret = -ENOMEM;
goto out;
}
msg_head = genlmsg_put(msg, info->snd_portid, info->snd_seq,
&batadv_netlink_family, 0,
BATADV_CMD_GET_MESH_INFO);
if (!msg_head) {
ret = -ENOBUFS;
goto out;
}
ret = batadv_netlink_mesh_info_put(msg, soft_iface);
out:
if (soft_iface)
dev_put(soft_iface);
if (ret) {
if (msg)
nlmsg_free(msg);
return ret;
}
genlmsg_end(msg, msg_head);
return genlmsg_reply(msg, info);
}
/**
* batadv_netlink_tp_meter_put() - Fill information of started tp_meter session
* @msg: netlink message to be sent back
* @cookie: tp meter session cookie
*
* Return: 0 on success, < 0 on error
*/
static int
batadv_netlink_tp_meter_put(struct sk_buff *msg, u32 cookie)
{
if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
return -ENOBUFS;
return 0;
}
/**
* batadv_netlink_tpmeter_notify() - send tp_meter result via netlink to client
* @bat_priv: the bat priv with all the soft interface information
* @dst: destination of tp_meter session
* @result: reason for tp meter session stop
* @test_time: total time ot the tp_meter session
* @total_bytes: bytes acked to the receiver
* @cookie: cookie of tp_meter session
*
* Return: 0 on success, < 0 on error
*/
int batadv_netlink_tpmeter_notify(struct batadv_priv *bat_priv, const u8 *dst,
u8 result, u32 test_time, u64 total_bytes,
u32 cookie)
{
struct sk_buff *msg;
void *hdr;
int ret;
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg)
return -ENOMEM;
hdr = genlmsg_put(msg, 0, 0, &batadv_netlink_family, 0,
BATADV_CMD_TP_METER);
if (!hdr) {
ret = -ENOBUFS;
goto err_genlmsg;
}
if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
goto nla_put_failure;
if (nla_put_u32(msg, BATADV_ATTR_TPMETER_TEST_TIME, test_time))
goto nla_put_failure;
if (nla_put_u64_64bit(msg, BATADV_ATTR_TPMETER_BYTES, total_bytes,
BATADV_ATTR_PAD))
goto nla_put_failure;
if (nla_put_u8(msg, BATADV_ATTR_TPMETER_RESULT, result))
goto nla_put_failure;
if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, dst))
goto nla_put_failure;
genlmsg_end(msg, hdr);
genlmsg_multicast_netns(&batadv_netlink_family,
dev_net(bat_priv->soft_iface), msg, 0,
BATADV_NL_MCGRP_TPMETER, GFP_KERNEL);
return 0;
nla_put_failure:
genlmsg_cancel(msg, hdr);
ret = -EMSGSIZE;
err_genlmsg:
nlmsg_free(msg);
return ret;
}
/**
* batadv_netlink_tp_meter_start() - Start a new tp_meter session
* @skb: received netlink message
* @info: receiver information
*
* Return: 0 on success, < 0 on error
*/
static int
batadv_netlink_tp_meter_start(struct sk_buff *skb, struct genl_info *info)
{
struct net *net = genl_info_net(info);
struct net_device *soft_iface;
struct batadv_priv *bat_priv;
struct sk_buff *msg = NULL;
u32 test_length;
void *msg_head;
int ifindex;
u32 cookie;
u8 *dst;
int ret;
if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
return -EINVAL;
if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
return -EINVAL;
if (!info->attrs[BATADV_ATTR_TPMETER_TEST_TIME])
return -EINVAL;
ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
if (!ifindex)
return -EINVAL;
dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);
test_length = nla_get_u32(info->attrs[BATADV_ATTR_TPMETER_TEST_TIME]);
soft_iface = dev_get_by_index(net, ifindex);
if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
ret = -ENODEV;
goto out;
}
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg) {
ret = -ENOMEM;
goto out;
}
msg_head = genlmsg_put(msg, info->snd_portid, info->snd_seq,
&batadv_netlink_family, 0,
BATADV_CMD_TP_METER);
if (!msg_head) {
ret = -ENOBUFS;
goto out;
}
bat_priv = netdev_priv(soft_iface);
batadv_tp_start(bat_priv, dst, test_length, &cookie);
ret = batadv_netlink_tp_meter_put(msg, cookie);
out:
if (soft_iface)
dev_put(soft_iface);
if (ret) {
if (msg)
nlmsg_free(msg);
return ret;
}
genlmsg_end(msg, msg_head);
return genlmsg_reply(msg, info);
}
/**
* batadv_netlink_tp_meter_start() - Cancel a running tp_meter session
* @skb: received netlink message
* @info: receiver information
*
* Return: 0 on success, < 0 on error
*/
static int
batadv_netlink_tp_meter_cancel(struct sk_buff *skb, struct genl_info *info)
{
struct net *net = genl_info_net(info);
struct net_device *soft_iface;
struct batadv_priv *bat_priv;
int ifindex;
u8 *dst;
int ret = 0;
if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
return -EINVAL;
if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
return -EINVAL;
ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
if (!ifindex)
return -EINVAL;
dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);
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);
batadv_tp_stop(bat_priv, dst, BATADV_TP_REASON_CANCEL);
out:
if (soft_iface)
dev_put(soft_iface);
return ret;
}
/**
* batadv_netlink_dump_hardif_entry() - Dump one hard interface into a message
* @msg: Netlink message to dump into
* @portid: Port making netlink request
* @seq: Sequence number of netlink message
* @hard_iface: Hard interface to dump
*
* Return: error code, or 0 on success
*/
static int
batadv_netlink_dump_hardif_entry(struct sk_buff *msg, u32 portid, u32 seq,
struct batadv_hard_iface *hard_iface)
{
struct net_device *net_dev = hard_iface->net_dev;
void *hdr;
hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, NLM_F_MULTI,
BATADV_CMD_GET_HARDIFS);
if (!hdr)
return -EMSGSIZE;
if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
net_dev->ifindex) ||
nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
net_dev->name) ||
nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
net_dev->dev_addr))
goto nla_put_failure;
if (hard_iface->if_status == BATADV_IF_ACTIVE) {
if (nla_put_flag(msg, BATADV_ATTR_ACTIVE))
goto nla_put_failure;
}
genlmsg_end(msg, hdr);
return 0;
nla_put_failure:
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}
/**
* batadv_netlink_dump_hardifs() - Dump all hard interface into a messages
* @msg: Netlink message to dump into
* @cb: Parameters from query
*
* Return: error code, or length of reply message on success
*/
static int
batadv_netlink_dump_hardifs(struct sk_buff *msg, struct netlink_callback *cb)
{
struct net *net = sock_net(cb->skb->sk);
struct net_device *soft_iface;
struct batadv_hard_iface *hard_iface;
int ifindex;
int portid = NETLINK_CB(cb->skb).portid;
int seq = cb->nlh->nlmsg_seq;
int skip = cb->args[0];
int i = 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)
return -ENODEV;
if (!batadv_softif_is_valid(soft_iface)) {
dev_put(soft_iface);
return -ENODEV;
}
rcu_read_lock();
list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
if (hard_iface->soft_iface != soft_iface)
continue;
if (i++ < skip)
continue;
if (batadv_netlink_dump_hardif_entry(msg, portid, seq,
hard_iface)) {
i--;
break;
}
}
rcu_read_unlock();
dev_put(soft_iface);
cb->args[0] = i;
return msg->len;
}
static const struct genl_ops batadv_netlink_ops[] = {
{
.cmd = BATADV_CMD_GET_MESH_INFO,
.flags = GENL_ADMIN_PERM,
.policy = batadv_netlink_policy,
.doit = batadv_netlink_get_mesh_info,
},
{
.cmd = BATADV_CMD_TP_METER,
.flags = GENL_ADMIN_PERM,
.policy = batadv_netlink_policy,
.doit = batadv_netlink_tp_meter_start,
},
{
.cmd = BATADV_CMD_TP_METER_CANCEL,
.flags = GENL_ADMIN_PERM,
.policy = batadv_netlink_policy,
.doit = batadv_netlink_tp_meter_cancel,
},
{
.cmd = BATADV_CMD_GET_ROUTING_ALGOS,
.flags = GENL_ADMIN_PERM,
.policy = batadv_netlink_policy,
.dumpit = batadv_algo_dump,
},
{
.cmd = BATADV_CMD_GET_HARDIFS,
.flags = GENL_ADMIN_PERM,
.policy = batadv_netlink_policy,
.dumpit = batadv_netlink_dump_hardifs,
},
{
.cmd = BATADV_CMD_GET_TRANSTABLE_LOCAL,
.flags = GENL_ADMIN_PERM,
.policy = batadv_netlink_policy,
.dumpit = batadv_tt_local_dump,
},
{
.cmd = BATADV_CMD_GET_TRANSTABLE_GLOBAL,
.flags = GENL_ADMIN_PERM,
.policy = batadv_netlink_policy,
.dumpit = batadv_tt_global_dump,
},
{
.cmd = BATADV_CMD_GET_ORIGINATORS,
.flags = GENL_ADMIN_PERM,
.policy = batadv_netlink_policy,
.dumpit = batadv_orig_dump,
},
{
.cmd = BATADV_CMD_GET_NEIGHBORS,
.flags = GENL_ADMIN_PERM,
.policy = batadv_netlink_policy,
.dumpit = batadv_hardif_neigh_dump,
},
{
.cmd = BATADV_CMD_GET_GATEWAYS,
.flags = GENL_ADMIN_PERM,
.policy = batadv_netlink_policy,
.dumpit = batadv_gw_dump,
},
{
.cmd = BATADV_CMD_GET_BLA_CLAIM,
.flags = GENL_ADMIN_PERM,
.policy = batadv_netlink_policy,
.dumpit = batadv_bla_claim_dump,
},
{
.cmd = BATADV_CMD_GET_BLA_BACKBONE,
.flags = GENL_ADMIN_PERM,
.policy = batadv_netlink_policy,
.dumpit = batadv_bla_backbone_dump,
},
{
.cmd = BATADV_CMD_GET_DAT_CACHE,
.flags = GENL_ADMIN_PERM,
.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,
},
};
struct genl_family batadv_netlink_family __ro_after_init = {
.hdrsize = 0,
.name = BATADV_NL_NAME,
.version = 1,
.maxattr = BATADV_ATTR_MAX,
.netnsok = true,
.module = THIS_MODULE,
.ops = batadv_netlink_ops,
.n_ops = ARRAY_SIZE(batadv_netlink_ops),
.mcgrps = batadv_netlink_mcgrps,
.n_mcgrps = ARRAY_SIZE(batadv_netlink_mcgrps),
};
/**
* batadv_netlink_register() - register batadv genl netlink family
*/
void __init batadv_netlink_register(void)
{
int ret;
ret = genl_register_family(&batadv_netlink_family);
if (ret)
pr_warn("unable to register netlink family");
}
/**
* batadv_netlink_unregister() - unregister batadv genl netlink family
*/
void batadv_netlink_unregister(void)
{
genl_unregister_family(&batadv_netlink_family);
}